xref: /linux/fs/smb/server/smb2pdu.c (revision 466b2d40f60ce874cb9b56dc88bd1a0880a43786)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *   Copyright (C) 2016 Namjae Jeon <linkinjeon@kernel.org>
4  *   Copyright (C) 2018 Samsung Electronics Co., Ltd.
5  */
6 
7 #include <linux/inetdevice.h>
8 #include <net/addrconf.h>
9 #include <linux/syscalls.h>
10 #include <linux/namei.h>
11 #include <linux/statfs.h>
12 #include <linux/ethtool.h>
13 #include <linux/falloc.h>
14 #include <linux/mount.h>
15 #include <linux/filelock.h>
16 
17 #include "glob.h"
18 #include "smbfsctl.h"
19 #include "oplock.h"
20 #include "smbacl.h"
21 
22 #include "auth.h"
23 #include "asn1.h"
24 #include "connection.h"
25 #include "transport_ipc.h"
26 #include "transport_rdma.h"
27 #include "vfs.h"
28 #include "vfs_cache.h"
29 #include "misc.h"
30 
31 #include "server.h"
32 #include "smb_common.h"
33 #include "../common/smb2status.h"
34 #include "ksmbd_work.h"
35 #include "mgmt/user_config.h"
36 #include "mgmt/share_config.h"
37 #include "mgmt/tree_connect.h"
38 #include "mgmt/user_session.h"
39 #include "mgmt/ksmbd_ida.h"
40 #include "ndr.h"
41 
__wbuf(struct ksmbd_work * work,void ** req,void ** rsp)42 static void __wbuf(struct ksmbd_work *work, void **req, void **rsp)
43 {
44 	if (work->next_smb2_rcv_hdr_off) {
45 		*req = ksmbd_req_buf_next(work);
46 		*rsp = ksmbd_resp_buf_next(work);
47 	} else {
48 		*req = smb2_get_msg(work->request_buf);
49 		*rsp = smb2_get_msg(work->response_buf);
50 	}
51 }
52 
53 #define WORK_BUFFERS(w, rq, rs)	__wbuf((w), (void **)&(rq), (void **)&(rs))
54 
55 /**
56  * check_session_id() - check for valid session id in smb header
57  * @conn:	connection instance
58  * @id:		session id from smb header
59  *
60  * Return:      1 if valid session id, otherwise 0
61  */
check_session_id(struct ksmbd_conn * conn,u64 id)62 static inline bool check_session_id(struct ksmbd_conn *conn, u64 id)
63 {
64 	struct ksmbd_session *sess;
65 
66 	if (id == 0 || id == -1)
67 		return false;
68 
69 	sess = ksmbd_session_lookup_all(conn, id);
70 	if (sess) {
71 		ksmbd_user_session_put(sess);
72 		return true;
73 	}
74 	pr_err("Invalid user session id: %llu\n", id);
75 	return false;
76 }
77 
lookup_chann_list(struct ksmbd_session * sess,struct ksmbd_conn * conn)78 struct channel *lookup_chann_list(struct ksmbd_session *sess, struct ksmbd_conn *conn)
79 {
80 	return xa_load(&sess->ksmbd_chann_list, (long)conn);
81 }
82 
83 /**
84  * smb2_get_ksmbd_tcon() - get tree connection information using a tree id.
85  * @work:	smb work
86  *
87  * Return:	0 if there is a tree connection matched or these are
88  *		skipable commands, otherwise error
89  */
smb2_get_ksmbd_tcon(struct ksmbd_work * work)90 int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
91 {
92 	struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
93 	unsigned int cmd = le16_to_cpu(req_hdr->Command);
94 	unsigned int tree_id;
95 
96 	if (cmd == SMB2_TREE_CONNECT_HE ||
97 	    cmd ==  SMB2_CANCEL_HE ||
98 	    cmd ==  SMB2_LOGOFF_HE) {
99 		ksmbd_debug(SMB, "skip to check tree connect request\n");
100 		return 0;
101 	}
102 
103 	if (xa_empty(&work->sess->tree_conns)) {
104 		ksmbd_debug(SMB, "NO tree connected\n");
105 		return -ENOENT;
106 	}
107 
108 	tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
109 
110 	/*
111 	 * If request is not the first in Compound request,
112 	 * Just validate tree id in header with work->tcon->id.
113 	 */
114 	if (work->next_smb2_rcv_hdr_off) {
115 		if (!work->tcon) {
116 			pr_err("The first operation in the compound does not have tcon\n");
117 			return -EINVAL;
118 		}
119 		if (tree_id != UINT_MAX && work->tcon->id != tree_id) {
120 			pr_err("tree id(%u) is different with id(%u) in first operation\n",
121 					tree_id, work->tcon->id);
122 			return -EINVAL;
123 		}
124 		return 1;
125 	}
126 
127 	work->tcon = ksmbd_tree_conn_lookup(work->sess, tree_id);
128 	if (!work->tcon) {
129 		pr_err("Invalid tid %d\n", tree_id);
130 		return -ENOENT;
131 	}
132 
133 	return 1;
134 }
135 
136 /**
137  * smb2_set_err_rsp() - set error response code on smb response
138  * @work:	smb work containing response buffer
139  */
smb2_set_err_rsp(struct ksmbd_work * work)140 void smb2_set_err_rsp(struct ksmbd_work *work)
141 {
142 	struct smb2_err_rsp *err_rsp;
143 
144 	if (work->next_smb2_rcv_hdr_off)
145 		err_rsp = ksmbd_resp_buf_next(work);
146 	else
147 		err_rsp = smb2_get_msg(work->response_buf);
148 
149 	if (err_rsp->hdr.Status != STATUS_STOPPED_ON_SYMLINK) {
150 		int err;
151 
152 		err_rsp->StructureSize = SMB2_ERROR_STRUCTURE_SIZE2_LE;
153 		err_rsp->ErrorContextCount = 0;
154 		err_rsp->Reserved = 0;
155 		err_rsp->ByteCount = 0;
156 		err_rsp->ErrorData[0] = 0;
157 		err = ksmbd_iov_pin_rsp(work, (void *)err_rsp,
158 					__SMB2_HEADER_STRUCTURE_SIZE +
159 						SMB2_ERROR_STRUCTURE_SIZE2);
160 		if (err)
161 			work->send_no_response = 1;
162 	}
163 }
164 
165 /**
166  * is_smb2_neg_cmd() - is it smb2 negotiation command
167  * @work:	smb work containing smb header
168  *
169  * Return:      true if smb2 negotiation command, otherwise false
170  */
is_smb2_neg_cmd(struct ksmbd_work * work)171 bool is_smb2_neg_cmd(struct ksmbd_work *work)
172 {
173 	struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
174 
175 	/* is it SMB2 header ? */
176 	if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
177 		return false;
178 
179 	/* make sure it is request not response message */
180 	if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
181 		return false;
182 
183 	if (hdr->Command != SMB2_NEGOTIATE)
184 		return false;
185 
186 	return true;
187 }
188 
189 /**
190  * is_smb2_rsp() - is it smb2 response
191  * @work:	smb work containing smb response buffer
192  *
193  * Return:      true if smb2 response, otherwise false
194  */
is_smb2_rsp(struct ksmbd_work * work)195 bool is_smb2_rsp(struct ksmbd_work *work)
196 {
197 	struct smb2_hdr *hdr = smb2_get_msg(work->response_buf);
198 
199 	/* is it SMB2 header ? */
200 	if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
201 		return false;
202 
203 	/* make sure it is response not request message */
204 	if (!(hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR))
205 		return false;
206 
207 	return true;
208 }
209 
210 /**
211  * get_smb2_cmd_val() - get smb command code from smb header
212  * @work:	smb work containing smb request buffer
213  *
214  * Return:      smb2 request command value
215  */
get_smb2_cmd_val(struct ksmbd_work * work)216 u16 get_smb2_cmd_val(struct ksmbd_work *work)
217 {
218 	struct smb2_hdr *rcv_hdr;
219 
220 	if (work->next_smb2_rcv_hdr_off)
221 		rcv_hdr = ksmbd_req_buf_next(work);
222 	else
223 		rcv_hdr = smb2_get_msg(work->request_buf);
224 	return le16_to_cpu(rcv_hdr->Command);
225 }
226 
227 /**
228  * set_smb2_rsp_status() - set error response code on smb2 header
229  * @work:	smb work containing response buffer
230  * @err:	error response code
231  */
set_smb2_rsp_status(struct ksmbd_work * work,__le32 err)232 void set_smb2_rsp_status(struct ksmbd_work *work, __le32 err)
233 {
234 	struct smb2_hdr *rsp_hdr;
235 
236 	rsp_hdr = smb2_get_msg(work->response_buf);
237 	rsp_hdr->Status = err;
238 
239 	work->iov_idx = 0;
240 	work->iov_cnt = 0;
241 	work->next_smb2_rcv_hdr_off = 0;
242 	smb2_set_err_rsp(work);
243 }
244 
245 /**
246  * init_smb2_neg_rsp() - initialize smb2 response for negotiate command
247  * @work:	smb work containing smb request buffer
248  *
249  * smb2 negotiate response is sent in reply of smb1 negotiate command for
250  * dialect auto-negotiation.
251  */
init_smb2_neg_rsp(struct ksmbd_work * work)252 int init_smb2_neg_rsp(struct ksmbd_work *work)
253 {
254 	struct smb2_hdr *rsp_hdr;
255 	struct smb2_negotiate_rsp *rsp;
256 	struct ksmbd_conn *conn = work->conn;
257 	int err;
258 
259 	rsp_hdr = smb2_get_msg(work->response_buf);
260 	memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
261 	rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
262 	rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
263 	rsp_hdr->CreditRequest = cpu_to_le16(2);
264 	rsp_hdr->Command = SMB2_NEGOTIATE;
265 	rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
266 	rsp_hdr->NextCommand = 0;
267 	rsp_hdr->MessageId = 0;
268 	rsp_hdr->Id.SyncId.ProcessId = 0;
269 	rsp_hdr->Id.SyncId.TreeId = 0;
270 	rsp_hdr->SessionId = 0;
271 	memset(rsp_hdr->Signature, 0, 16);
272 
273 	rsp = smb2_get_msg(work->response_buf);
274 
275 	WARN_ON(ksmbd_conn_good(conn));
276 
277 	rsp->StructureSize = cpu_to_le16(65);
278 	ksmbd_debug(SMB, "conn->dialect 0x%x\n", conn->dialect);
279 	rsp->DialectRevision = cpu_to_le16(conn->dialect);
280 	/* Not setting conn guid rsp->ServerGUID, as it
281 	 * not used by client for identifying connection
282 	 */
283 	rsp->Capabilities = cpu_to_le32(conn->vals->capabilities);
284 	/* Default Max Message Size till SMB2.0, 64K*/
285 	rsp->MaxTransactSize = cpu_to_le32(conn->vals->max_trans_size);
286 	rsp->MaxReadSize = cpu_to_le32(conn->vals->max_read_size);
287 	rsp->MaxWriteSize = cpu_to_le32(conn->vals->max_write_size);
288 
289 	rsp->SystemTime = cpu_to_le64(ksmbd_systime());
290 	rsp->ServerStartTime = 0;
291 
292 	rsp->SecurityBufferOffset = cpu_to_le16(128);
293 	rsp->SecurityBufferLength = cpu_to_le16(AUTH_GSS_LENGTH);
294 	ksmbd_copy_gss_neg_header((char *)(&rsp->hdr) +
295 		le16_to_cpu(rsp->SecurityBufferOffset));
296 	rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
297 	if (server_conf.signing == KSMBD_CONFIG_OPT_MANDATORY)
298 		rsp->SecurityMode |= SMB2_NEGOTIATE_SIGNING_REQUIRED_LE;
299 	err = ksmbd_iov_pin_rsp(work, rsp,
300 				sizeof(struct smb2_negotiate_rsp) + AUTH_GSS_LENGTH);
301 	if (err)
302 		return err;
303 	conn->use_spnego = true;
304 
305 	ksmbd_conn_set_need_negotiate(conn);
306 	return 0;
307 }
308 
309 /**
310  * smb2_set_rsp_credits() - set number of credits in response buffer
311  * @work:	smb work containing smb response buffer
312  */
smb2_set_rsp_credits(struct ksmbd_work * work)313 int smb2_set_rsp_credits(struct ksmbd_work *work)
314 {
315 	struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
316 	struct smb2_hdr *hdr = ksmbd_resp_buf_next(work);
317 	struct ksmbd_conn *conn = work->conn;
318 	unsigned short credits_requested, aux_max;
319 	unsigned short credit_charge, credits_granted = 0;
320 
321 	if (work->send_no_response)
322 		return 0;
323 
324 	hdr->CreditCharge = req_hdr->CreditCharge;
325 
326 	if (conn->total_credits > conn->vals->max_credits) {
327 		hdr->CreditRequest = 0;
328 		pr_err("Total credits overflow: %d\n", conn->total_credits);
329 		return -EINVAL;
330 	}
331 
332 	credit_charge = max_t(unsigned short,
333 			      le16_to_cpu(req_hdr->CreditCharge), 1);
334 	if (credit_charge > conn->total_credits) {
335 		ksmbd_debug(SMB, "Insufficient credits granted, given: %u, granted: %u\n",
336 			    credit_charge, conn->total_credits);
337 		return -EINVAL;
338 	}
339 
340 	conn->total_credits -= credit_charge;
341 	conn->outstanding_credits -= credit_charge;
342 	credits_requested = max_t(unsigned short,
343 				  le16_to_cpu(req_hdr->CreditRequest), 1);
344 
345 	/* according to smb2.credits smbtorture, Windows server
346 	 * 2016 or later grant up to 8192 credits at once.
347 	 *
348 	 * TODO: Need to adjuct CreditRequest value according to
349 	 * current cpu load
350 	 */
351 	if (hdr->Command == SMB2_NEGOTIATE)
352 		aux_max = 1;
353 	else
354 		aux_max = conn->vals->max_credits - conn->total_credits;
355 	credits_granted = min_t(unsigned short, credits_requested, aux_max);
356 
357 	conn->total_credits += credits_granted;
358 	work->credits_granted += credits_granted;
359 
360 	if (!req_hdr->NextCommand) {
361 		/* Update CreditRequest in last request */
362 		hdr->CreditRequest = cpu_to_le16(work->credits_granted);
363 	}
364 	ksmbd_debug(SMB,
365 		    "credits: requested[%d] granted[%d] total_granted[%d]\n",
366 		    credits_requested, credits_granted,
367 		    conn->total_credits);
368 	return 0;
369 }
370 
371 /**
372  * init_chained_smb2_rsp() - initialize smb2 chained response
373  * @work:	smb work containing smb response buffer
374  */
init_chained_smb2_rsp(struct ksmbd_work * work)375 static void init_chained_smb2_rsp(struct ksmbd_work *work)
376 {
377 	struct smb2_hdr *req = ksmbd_req_buf_next(work);
378 	struct smb2_hdr *rsp = ksmbd_resp_buf_next(work);
379 	struct smb2_hdr *rsp_hdr;
380 	struct smb2_hdr *rcv_hdr;
381 	int next_hdr_offset = 0;
382 	int len, new_len;
383 
384 	/* Len of this response = updated RFC len - offset of previous cmd
385 	 * in the compound rsp
386 	 */
387 
388 	/* Storing the current local FID which may be needed by subsequent
389 	 * command in the compound request
390 	 */
391 	if (req->Command == SMB2_CREATE && rsp->Status == STATUS_SUCCESS) {
392 		work->compound_fid = ((struct smb2_create_rsp *)rsp)->VolatileFileId;
393 		work->compound_pfid = ((struct smb2_create_rsp *)rsp)->PersistentFileId;
394 		work->compound_sid = le64_to_cpu(rsp->SessionId);
395 	}
396 
397 	len = get_rfc1002_len(work->response_buf) - work->next_smb2_rsp_hdr_off;
398 	next_hdr_offset = le32_to_cpu(req->NextCommand);
399 
400 	new_len = ALIGN(len, 8);
401 	work->iov[work->iov_idx].iov_len += (new_len - len);
402 	inc_rfc1001_len(work->response_buf, new_len - len);
403 	rsp->NextCommand = cpu_to_le32(new_len);
404 
405 	work->next_smb2_rcv_hdr_off += next_hdr_offset;
406 	work->curr_smb2_rsp_hdr_off = work->next_smb2_rsp_hdr_off;
407 	work->next_smb2_rsp_hdr_off += new_len;
408 	ksmbd_debug(SMB,
409 		    "Compound req new_len = %d rcv off = %d rsp off = %d\n",
410 		    new_len, work->next_smb2_rcv_hdr_off,
411 		    work->next_smb2_rsp_hdr_off);
412 
413 	rsp_hdr = ksmbd_resp_buf_next(work);
414 	rcv_hdr = ksmbd_req_buf_next(work);
415 
416 	if (!(rcv_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)) {
417 		ksmbd_debug(SMB, "related flag should be set\n");
418 		work->compound_fid = KSMBD_NO_FID;
419 		work->compound_pfid = KSMBD_NO_FID;
420 	}
421 	memset((char *)rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
422 	rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
423 	rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
424 	rsp_hdr->Command = rcv_hdr->Command;
425 
426 	/*
427 	 * Message is response. We don't grant oplock yet.
428 	 */
429 	rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR |
430 				SMB2_FLAGS_RELATED_OPERATIONS);
431 	rsp_hdr->NextCommand = 0;
432 	rsp_hdr->MessageId = rcv_hdr->MessageId;
433 	rsp_hdr->Id.SyncId.ProcessId = rcv_hdr->Id.SyncId.ProcessId;
434 	rsp_hdr->Id.SyncId.TreeId = rcv_hdr->Id.SyncId.TreeId;
435 	rsp_hdr->SessionId = rcv_hdr->SessionId;
436 	memcpy(rsp_hdr->Signature, rcv_hdr->Signature, 16);
437 }
438 
439 /**
440  * is_chained_smb2_message() - check for chained command
441  * @work:	smb work containing smb request buffer
442  *
443  * Return:      true if chained request, otherwise false
444  */
is_chained_smb2_message(struct ksmbd_work * work)445 bool is_chained_smb2_message(struct ksmbd_work *work)
446 {
447 	struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
448 	unsigned int len, next_cmd;
449 
450 	if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
451 		return false;
452 
453 	hdr = ksmbd_req_buf_next(work);
454 	next_cmd = le32_to_cpu(hdr->NextCommand);
455 	if (next_cmd > 0) {
456 		if ((u64)work->next_smb2_rcv_hdr_off + next_cmd +
457 			__SMB2_HEADER_STRUCTURE_SIZE >
458 		    get_rfc1002_len(work->request_buf)) {
459 			pr_err("next command(%u) offset exceeds smb msg size\n",
460 			       next_cmd);
461 			return false;
462 		}
463 
464 		if ((u64)get_rfc1002_len(work->response_buf) + MAX_CIFS_SMALL_BUFFER_SIZE >
465 		    work->response_sz) {
466 			pr_err("next response offset exceeds response buffer size\n");
467 			return false;
468 		}
469 
470 		ksmbd_debug(SMB, "got SMB2 chained command\n");
471 		init_chained_smb2_rsp(work);
472 		return true;
473 	} else if (work->next_smb2_rcv_hdr_off) {
474 		/*
475 		 * This is last request in chained command,
476 		 * align response to 8 byte
477 		 */
478 		len = ALIGN(get_rfc1002_len(work->response_buf), 8);
479 		len = len - get_rfc1002_len(work->response_buf);
480 		if (len) {
481 			ksmbd_debug(SMB, "padding len %u\n", len);
482 			work->iov[work->iov_idx].iov_len += len;
483 			inc_rfc1001_len(work->response_buf, len);
484 		}
485 		work->curr_smb2_rsp_hdr_off = work->next_smb2_rsp_hdr_off;
486 	}
487 	return false;
488 }
489 
490 /**
491  * init_smb2_rsp_hdr() - initialize smb2 response
492  * @work:	smb work containing smb request buffer
493  *
494  * Return:      0
495  */
init_smb2_rsp_hdr(struct ksmbd_work * work)496 int init_smb2_rsp_hdr(struct ksmbd_work *work)
497 {
498 	struct smb2_hdr *rsp_hdr = smb2_get_msg(work->response_buf);
499 	struct smb2_hdr *rcv_hdr = smb2_get_msg(work->request_buf);
500 
501 	memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
502 	rsp_hdr->ProtocolId = rcv_hdr->ProtocolId;
503 	rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
504 	rsp_hdr->Command = rcv_hdr->Command;
505 
506 	/*
507 	 * Message is response. We don't grant oplock yet.
508 	 */
509 	rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
510 	rsp_hdr->NextCommand = 0;
511 	rsp_hdr->MessageId = rcv_hdr->MessageId;
512 	rsp_hdr->Id.SyncId.ProcessId = rcv_hdr->Id.SyncId.ProcessId;
513 	rsp_hdr->Id.SyncId.TreeId = rcv_hdr->Id.SyncId.TreeId;
514 	rsp_hdr->SessionId = rcv_hdr->SessionId;
515 	memcpy(rsp_hdr->Signature, rcv_hdr->Signature, 16);
516 
517 	return 0;
518 }
519 
520 /**
521  * smb2_allocate_rsp_buf() - allocate smb2 response buffer
522  * @work:	smb work containing smb request buffer
523  *
524  * Return:      0 on success, otherwise error
525  */
smb2_allocate_rsp_buf(struct ksmbd_work * work)526 int smb2_allocate_rsp_buf(struct ksmbd_work *work)
527 {
528 	struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
529 	size_t small_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
530 	size_t large_sz = small_sz + work->conn->vals->max_trans_size;
531 	size_t sz = small_sz;
532 	int cmd = le16_to_cpu(hdr->Command);
533 
534 	if (cmd == SMB2_IOCTL_HE || cmd == SMB2_QUERY_DIRECTORY_HE)
535 		sz = large_sz;
536 
537 	if (cmd == SMB2_QUERY_INFO_HE) {
538 		struct smb2_query_info_req *req;
539 
540 		if (get_rfc1002_len(work->request_buf) <
541 		    offsetof(struct smb2_query_info_req, OutputBufferLength))
542 			return -EINVAL;
543 
544 		req = smb2_get_msg(work->request_buf);
545 		if ((req->InfoType == SMB2_O_INFO_FILE &&
546 		     (req->FileInfoClass == FILE_FULL_EA_INFORMATION ||
547 		     req->FileInfoClass == FILE_ALL_INFORMATION)) ||
548 		    req->InfoType == SMB2_O_INFO_SECURITY)
549 			sz = large_sz;
550 	}
551 
552 	/* allocate large response buf for chained commands */
553 	if (le32_to_cpu(hdr->NextCommand) > 0)
554 		sz = large_sz;
555 
556 	work->response_buf = kvzalloc(sz, KSMBD_DEFAULT_GFP);
557 	if (!work->response_buf)
558 		return -ENOMEM;
559 
560 	work->response_sz = sz;
561 	return 0;
562 }
563 
564 /**
565  * smb2_check_user_session() - check for valid session for a user
566  * @work:	smb work containing smb request buffer
567  *
568  * Return:      0 on success, otherwise error
569  */
smb2_check_user_session(struct ksmbd_work * work)570 int smb2_check_user_session(struct ksmbd_work *work)
571 {
572 	struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
573 	struct ksmbd_conn *conn = work->conn;
574 	unsigned int cmd = le16_to_cpu(req_hdr->Command);
575 	unsigned long long sess_id;
576 
577 	/*
578 	 * SMB2_ECHO, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command do not
579 	 * require a session id, so no need to validate user session's for
580 	 * these commands.
581 	 */
582 	if (cmd == SMB2_ECHO_HE || cmd == SMB2_NEGOTIATE_HE ||
583 	    cmd == SMB2_SESSION_SETUP_HE)
584 		return 0;
585 
586 	if (!ksmbd_conn_good(conn))
587 		return -EIO;
588 
589 	sess_id = le64_to_cpu(req_hdr->SessionId);
590 
591 	/*
592 	 * If request is not the first in Compound request,
593 	 * Just validate session id in header with work->sess->id.
594 	 */
595 	if (work->next_smb2_rcv_hdr_off) {
596 		if (!work->sess) {
597 			pr_err("The first operation in the compound does not have sess\n");
598 			return -EINVAL;
599 		}
600 		if (sess_id != ULLONG_MAX && work->sess->id != sess_id) {
601 			pr_err("session id(%llu) is different with the first operation(%lld)\n",
602 					sess_id, work->sess->id);
603 			return -EINVAL;
604 		}
605 		return 1;
606 	}
607 
608 	/* Check for validity of user session */
609 	work->sess = ksmbd_session_lookup_all(conn, sess_id);
610 	if (work->sess)
611 		return 1;
612 	ksmbd_debug(SMB, "Invalid user session, Uid %llu\n", sess_id);
613 	return -ENOENT;
614 }
615 
616 /**
617  * smb2_get_name() - get filename string from on the wire smb format
618  * @src:	source buffer
619  * @maxlen:	maxlen of source string
620  * @local_nls:	nls_table pointer
621  *
622  * Return:      matching converted filename on success, otherwise error ptr
623  */
624 static char *
smb2_get_name(const char * src,const int maxlen,struct nls_table * local_nls)625 smb2_get_name(const char *src, const int maxlen, struct nls_table *local_nls)
626 {
627 	char *name;
628 
629 	name = smb_strndup_from_utf16(src, maxlen, 1, local_nls);
630 	if (IS_ERR(name)) {
631 		pr_err("failed to get name %ld\n", PTR_ERR(name));
632 		return name;
633 	}
634 
635 	if (*name == '\\') {
636 		pr_err("not allow directory name included leading slash\n");
637 		kfree(name);
638 		return ERR_PTR(-EINVAL);
639 	}
640 
641 	ksmbd_conv_path_to_unix(name);
642 	ksmbd_strip_last_slash(name);
643 	return name;
644 }
645 
setup_async_work(struct ksmbd_work * work,void (* fn)(void **),void ** arg)646 int setup_async_work(struct ksmbd_work *work, void (*fn)(void **), void **arg)
647 {
648 	struct ksmbd_conn *conn = work->conn;
649 	int id;
650 
651 	id = ksmbd_acquire_async_msg_id(&conn->async_ida);
652 	if (id < 0) {
653 		pr_err("Failed to alloc async message id\n");
654 		return id;
655 	}
656 	work->asynchronous = true;
657 	work->async_id = id;
658 
659 	ksmbd_debug(SMB,
660 		    "Send interim Response to inform async request id : %d\n",
661 		    work->async_id);
662 
663 	work->cancel_fn = fn;
664 	work->cancel_argv = arg;
665 
666 	if (list_empty(&work->async_request_entry)) {
667 		spin_lock(&conn->request_lock);
668 		list_add_tail(&work->async_request_entry, &conn->async_requests);
669 		spin_unlock(&conn->request_lock);
670 	}
671 
672 	return 0;
673 }
674 
release_async_work(struct ksmbd_work * work)675 void release_async_work(struct ksmbd_work *work)
676 {
677 	struct ksmbd_conn *conn = work->conn;
678 
679 	spin_lock(&conn->request_lock);
680 	list_del_init(&work->async_request_entry);
681 	spin_unlock(&conn->request_lock);
682 
683 	work->asynchronous = 0;
684 	work->cancel_fn = NULL;
685 	kfree(work->cancel_argv);
686 	work->cancel_argv = NULL;
687 	if (work->async_id) {
688 		ksmbd_release_id(&conn->async_ida, work->async_id);
689 		work->async_id = 0;
690 	}
691 }
692 
smb2_send_interim_resp(struct ksmbd_work * work,__le32 status)693 void smb2_send_interim_resp(struct ksmbd_work *work, __le32 status)
694 {
695 	struct smb2_hdr *rsp_hdr;
696 	struct ksmbd_work *in_work = ksmbd_alloc_work_struct();
697 
698 	if (allocate_interim_rsp_buf(in_work)) {
699 		pr_err("smb_allocate_rsp_buf failed!\n");
700 		ksmbd_free_work_struct(in_work);
701 		return;
702 	}
703 
704 	in_work->conn = work->conn;
705 	memcpy(smb2_get_msg(in_work->response_buf), ksmbd_resp_buf_next(work),
706 	       __SMB2_HEADER_STRUCTURE_SIZE);
707 
708 	rsp_hdr = smb2_get_msg(in_work->response_buf);
709 	rsp_hdr->Flags |= SMB2_FLAGS_ASYNC_COMMAND;
710 	rsp_hdr->Id.AsyncId = cpu_to_le64(work->async_id);
711 	smb2_set_err_rsp(in_work);
712 	rsp_hdr->Status = status;
713 
714 	ksmbd_conn_write(in_work);
715 	ksmbd_free_work_struct(in_work);
716 }
717 
smb2_get_reparse_tag_special_file(umode_t mode)718 static __le32 smb2_get_reparse_tag_special_file(umode_t mode)
719 {
720 	if (S_ISDIR(mode) || S_ISREG(mode))
721 		return 0;
722 
723 	if (S_ISLNK(mode))
724 		return IO_REPARSE_TAG_LX_SYMLINK_LE;
725 	else if (S_ISFIFO(mode))
726 		return IO_REPARSE_TAG_LX_FIFO_LE;
727 	else if (S_ISSOCK(mode))
728 		return IO_REPARSE_TAG_AF_UNIX_LE;
729 	else if (S_ISCHR(mode))
730 		return IO_REPARSE_TAG_LX_CHR_LE;
731 	else if (S_ISBLK(mode))
732 		return IO_REPARSE_TAG_LX_BLK_LE;
733 
734 	return 0;
735 }
736 
737 /**
738  * smb2_get_dos_mode() - get file mode in dos format from unix mode
739  * @stat:	kstat containing file mode
740  * @attribute:	attribute flags
741  *
742  * Return:      converted dos mode
743  */
smb2_get_dos_mode(struct kstat * stat,int attribute)744 static int smb2_get_dos_mode(struct kstat *stat, int attribute)
745 {
746 	int attr = 0;
747 
748 	if (S_ISDIR(stat->mode)) {
749 		attr = FILE_ATTRIBUTE_DIRECTORY |
750 			(attribute & (FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM));
751 	} else {
752 		attr = (attribute & 0x00005137) | FILE_ATTRIBUTE_ARCHIVE;
753 		attr &= ~(FILE_ATTRIBUTE_DIRECTORY);
754 		if (S_ISREG(stat->mode) && (server_conf.share_fake_fscaps &
755 				FILE_SUPPORTS_SPARSE_FILES))
756 			attr |= FILE_ATTRIBUTE_SPARSE_FILE;
757 
758 		if (smb2_get_reparse_tag_special_file(stat->mode))
759 			attr |= FILE_ATTRIBUTE_REPARSE_POINT;
760 	}
761 
762 	return attr;
763 }
764 
build_preauth_ctxt(struct smb2_preauth_neg_context * pneg_ctxt,__le16 hash_id)765 static void build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt,
766 			       __le16 hash_id)
767 {
768 	pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
769 	pneg_ctxt->DataLength = cpu_to_le16(38);
770 	pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
771 	pneg_ctxt->Reserved = cpu_to_le32(0);
772 	pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
773 	get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
774 	pneg_ctxt->HashAlgorithms = hash_id;
775 }
776 
build_encrypt_ctxt(struct smb2_encryption_neg_context * pneg_ctxt,__le16 cipher_type)777 static void build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt,
778 			       __le16 cipher_type)
779 {
780 	pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
781 	pneg_ctxt->DataLength = cpu_to_le16(4);
782 	pneg_ctxt->Reserved = cpu_to_le32(0);
783 	pneg_ctxt->CipherCount = cpu_to_le16(1);
784 	pneg_ctxt->Ciphers[0] = cipher_type;
785 }
786 
build_sign_cap_ctxt(struct smb2_signing_capabilities * pneg_ctxt,__le16 sign_algo)787 static void build_sign_cap_ctxt(struct smb2_signing_capabilities *pneg_ctxt,
788 				__le16 sign_algo)
789 {
790 	pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
791 	pneg_ctxt->DataLength =
792 		cpu_to_le16((sizeof(struct smb2_signing_capabilities) + 2)
793 			- sizeof(struct smb2_neg_context));
794 	pneg_ctxt->Reserved = cpu_to_le32(0);
795 	pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(1);
796 	pneg_ctxt->SigningAlgorithms[0] = sign_algo;
797 }
798 
build_posix_ctxt(struct smb2_posix_neg_context * pneg_ctxt)799 static void build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
800 {
801 	pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
802 	pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
803 	/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
804 	pneg_ctxt->Name[0] = 0x93;
805 	pneg_ctxt->Name[1] = 0xAD;
806 	pneg_ctxt->Name[2] = 0x25;
807 	pneg_ctxt->Name[3] = 0x50;
808 	pneg_ctxt->Name[4] = 0x9C;
809 	pneg_ctxt->Name[5] = 0xB4;
810 	pneg_ctxt->Name[6] = 0x11;
811 	pneg_ctxt->Name[7] = 0xE7;
812 	pneg_ctxt->Name[8] = 0xB4;
813 	pneg_ctxt->Name[9] = 0x23;
814 	pneg_ctxt->Name[10] = 0x83;
815 	pneg_ctxt->Name[11] = 0xDE;
816 	pneg_ctxt->Name[12] = 0x96;
817 	pneg_ctxt->Name[13] = 0x8B;
818 	pneg_ctxt->Name[14] = 0xCD;
819 	pneg_ctxt->Name[15] = 0x7C;
820 }
821 
assemble_neg_contexts(struct ksmbd_conn * conn,struct smb2_negotiate_rsp * rsp)822 static unsigned int assemble_neg_contexts(struct ksmbd_conn *conn,
823 				  struct smb2_negotiate_rsp *rsp)
824 {
825 	char * const pneg_ctxt = (char *)rsp +
826 			le32_to_cpu(rsp->NegotiateContextOffset);
827 	int neg_ctxt_cnt = 1;
828 	int ctxt_size;
829 
830 	ksmbd_debug(SMB,
831 		    "assemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
832 	build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt,
833 			   conn->preauth_info->Preauth_HashId);
834 	ctxt_size = sizeof(struct smb2_preauth_neg_context);
835 
836 	if (conn->cipher_type) {
837 		/* Round to 8 byte boundary */
838 		ctxt_size = round_up(ctxt_size, 8);
839 		ksmbd_debug(SMB,
840 			    "assemble SMB2_ENCRYPTION_CAPABILITIES context\n");
841 		build_encrypt_ctxt((struct smb2_encryption_neg_context *)
842 				   (pneg_ctxt + ctxt_size),
843 				   conn->cipher_type);
844 		neg_ctxt_cnt++;
845 		ctxt_size += sizeof(struct smb2_encryption_neg_context) + 2;
846 	}
847 
848 	/* compression context not yet supported */
849 	WARN_ON(conn->compress_algorithm != SMB3_COMPRESS_NONE);
850 
851 	if (conn->posix_ext_supported) {
852 		ctxt_size = round_up(ctxt_size, 8);
853 		ksmbd_debug(SMB,
854 			    "assemble SMB2_POSIX_EXTENSIONS_AVAILABLE context\n");
855 		build_posix_ctxt((struct smb2_posix_neg_context *)
856 				 (pneg_ctxt + ctxt_size));
857 		neg_ctxt_cnt++;
858 		ctxt_size += sizeof(struct smb2_posix_neg_context);
859 	}
860 
861 	if (conn->signing_negotiated) {
862 		ctxt_size = round_up(ctxt_size, 8);
863 		ksmbd_debug(SMB,
864 			    "assemble SMB2_SIGNING_CAPABILITIES context\n");
865 		build_sign_cap_ctxt((struct smb2_signing_capabilities *)
866 				    (pneg_ctxt + ctxt_size),
867 				    conn->signing_algorithm);
868 		neg_ctxt_cnt++;
869 		ctxt_size += sizeof(struct smb2_signing_capabilities) + 2;
870 	}
871 
872 	rsp->NegotiateContextCount = cpu_to_le16(neg_ctxt_cnt);
873 	return ctxt_size + AUTH_GSS_PADDING;
874 }
875 
decode_preauth_ctxt(struct ksmbd_conn * conn,struct smb2_preauth_neg_context * pneg_ctxt,int ctxt_len)876 static __le32 decode_preauth_ctxt(struct ksmbd_conn *conn,
877 				  struct smb2_preauth_neg_context *pneg_ctxt,
878 				  int ctxt_len)
879 {
880 	/*
881 	 * sizeof(smb2_preauth_neg_context) assumes SMB311_SALT_SIZE Salt,
882 	 * which may not be present. Only check for used HashAlgorithms[1].
883 	 */
884 	if (ctxt_len <
885 	    sizeof(struct smb2_neg_context) + MIN_PREAUTH_CTXT_DATA_LEN)
886 		return STATUS_INVALID_PARAMETER;
887 
888 	if (pneg_ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
889 		return STATUS_NO_PREAUTH_INTEGRITY_HASH_OVERLAP;
890 
891 	conn->preauth_info->Preauth_HashId = SMB2_PREAUTH_INTEGRITY_SHA512;
892 	return STATUS_SUCCESS;
893 }
894 
decode_encrypt_ctxt(struct ksmbd_conn * conn,struct smb2_encryption_neg_context * pneg_ctxt,int ctxt_len)895 static void decode_encrypt_ctxt(struct ksmbd_conn *conn,
896 				struct smb2_encryption_neg_context *pneg_ctxt,
897 				int ctxt_len)
898 {
899 	int cph_cnt;
900 	int i, cphs_size;
901 
902 	if (sizeof(struct smb2_encryption_neg_context) > ctxt_len) {
903 		pr_err("Invalid SMB2_ENCRYPTION_CAPABILITIES context size\n");
904 		return;
905 	}
906 
907 	conn->cipher_type = 0;
908 
909 	cph_cnt = le16_to_cpu(pneg_ctxt->CipherCount);
910 	cphs_size = cph_cnt * sizeof(__le16);
911 
912 	if (sizeof(struct smb2_encryption_neg_context) + cphs_size >
913 	    ctxt_len) {
914 		pr_err("Invalid cipher count(%d)\n", cph_cnt);
915 		return;
916 	}
917 
918 	if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF)
919 		return;
920 
921 	for (i = 0; i < cph_cnt; i++) {
922 		if (pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES128_GCM ||
923 		    pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES128_CCM ||
924 		    pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES256_CCM ||
925 		    pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES256_GCM) {
926 			ksmbd_debug(SMB, "Cipher ID = 0x%x\n",
927 				    pneg_ctxt->Ciphers[i]);
928 			conn->cipher_type = pneg_ctxt->Ciphers[i];
929 			break;
930 		}
931 	}
932 }
933 
934 /**
935  * smb3_encryption_negotiated() - checks if server and client agreed on enabling encryption
936  * @conn:	smb connection
937  *
938  * Return:	true if connection should be encrypted, else false
939  */
smb3_encryption_negotiated(struct ksmbd_conn * conn)940 bool smb3_encryption_negotiated(struct ksmbd_conn *conn)
941 {
942 	if (!conn->ops->generate_encryptionkey)
943 		return false;
944 
945 	/*
946 	 * SMB 3.0 and 3.0.2 dialects use the SMB2_GLOBAL_CAP_ENCRYPTION flag.
947 	 * SMB 3.1.1 uses the cipher_type field.
948 	 */
949 	return (conn->vals->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) ||
950 	    conn->cipher_type;
951 }
952 
decode_compress_ctxt(struct ksmbd_conn * conn,struct smb2_compression_capabilities_context * pneg_ctxt)953 static void decode_compress_ctxt(struct ksmbd_conn *conn,
954 				 struct smb2_compression_capabilities_context *pneg_ctxt)
955 {
956 	conn->compress_algorithm = SMB3_COMPRESS_NONE;
957 }
958 
decode_sign_cap_ctxt(struct ksmbd_conn * conn,struct smb2_signing_capabilities * pneg_ctxt,int ctxt_len)959 static void decode_sign_cap_ctxt(struct ksmbd_conn *conn,
960 				 struct smb2_signing_capabilities *pneg_ctxt,
961 				 int ctxt_len)
962 {
963 	int sign_algo_cnt;
964 	int i, sign_alos_size;
965 
966 	if (sizeof(struct smb2_signing_capabilities) > ctxt_len) {
967 		pr_err("Invalid SMB2_SIGNING_CAPABILITIES context length\n");
968 		return;
969 	}
970 
971 	conn->signing_negotiated = false;
972 	sign_algo_cnt = le16_to_cpu(pneg_ctxt->SigningAlgorithmCount);
973 	sign_alos_size = sign_algo_cnt * sizeof(__le16);
974 
975 	if (sizeof(struct smb2_signing_capabilities) + sign_alos_size >
976 	    ctxt_len) {
977 		pr_err("Invalid signing algorithm count(%d)\n", sign_algo_cnt);
978 		return;
979 	}
980 
981 	for (i = 0; i < sign_algo_cnt; i++) {
982 		if (pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_HMAC_SHA256_LE ||
983 		    pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_AES_CMAC_LE) {
984 			ksmbd_debug(SMB, "Signing Algorithm ID = 0x%x\n",
985 				    pneg_ctxt->SigningAlgorithms[i]);
986 			conn->signing_negotiated = true;
987 			conn->signing_algorithm =
988 				pneg_ctxt->SigningAlgorithms[i];
989 			break;
990 		}
991 	}
992 }
993 
deassemble_neg_contexts(struct ksmbd_conn * conn,struct smb2_negotiate_req * req,unsigned int len_of_smb)994 static __le32 deassemble_neg_contexts(struct ksmbd_conn *conn,
995 				      struct smb2_negotiate_req *req,
996 				      unsigned int len_of_smb)
997 {
998 	/* +4 is to account for the RFC1001 len field */
999 	struct smb2_neg_context *pctx = (struct smb2_neg_context *)req;
1000 	int i = 0, len_of_ctxts;
1001 	unsigned int offset = le32_to_cpu(req->NegotiateContextOffset);
1002 	unsigned int neg_ctxt_cnt = le16_to_cpu(req->NegotiateContextCount);
1003 	__le32 status = STATUS_INVALID_PARAMETER;
1004 
1005 	ksmbd_debug(SMB, "decoding %d negotiate contexts\n", neg_ctxt_cnt);
1006 	if (len_of_smb <= offset) {
1007 		ksmbd_debug(SMB, "Invalid response: negotiate context offset\n");
1008 		return status;
1009 	}
1010 
1011 	len_of_ctxts = len_of_smb - offset;
1012 
1013 	while (i++ < neg_ctxt_cnt) {
1014 		int clen, ctxt_len;
1015 
1016 		if (len_of_ctxts < (int)sizeof(struct smb2_neg_context))
1017 			break;
1018 
1019 		pctx = (struct smb2_neg_context *)((char *)pctx + offset);
1020 		clen = le16_to_cpu(pctx->DataLength);
1021 		ctxt_len = clen + sizeof(struct smb2_neg_context);
1022 
1023 		if (ctxt_len > len_of_ctxts)
1024 			break;
1025 
1026 		if (pctx->ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES) {
1027 			ksmbd_debug(SMB,
1028 				    "deassemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
1029 			if (conn->preauth_info->Preauth_HashId)
1030 				break;
1031 
1032 			status = decode_preauth_ctxt(conn,
1033 						     (struct smb2_preauth_neg_context *)pctx,
1034 						     ctxt_len);
1035 			if (status != STATUS_SUCCESS)
1036 				break;
1037 		} else if (pctx->ContextType == SMB2_ENCRYPTION_CAPABILITIES) {
1038 			ksmbd_debug(SMB,
1039 				    "deassemble SMB2_ENCRYPTION_CAPABILITIES context\n");
1040 			if (conn->cipher_type)
1041 				break;
1042 
1043 			decode_encrypt_ctxt(conn,
1044 					    (struct smb2_encryption_neg_context *)pctx,
1045 					    ctxt_len);
1046 		} else if (pctx->ContextType == SMB2_COMPRESSION_CAPABILITIES) {
1047 			ksmbd_debug(SMB,
1048 				    "deassemble SMB2_COMPRESSION_CAPABILITIES context\n");
1049 			if (conn->compress_algorithm)
1050 				break;
1051 
1052 			decode_compress_ctxt(conn,
1053 					     (struct smb2_compression_capabilities_context *)pctx);
1054 		} else if (pctx->ContextType == SMB2_NETNAME_NEGOTIATE_CONTEXT_ID) {
1055 			ksmbd_debug(SMB,
1056 				    "deassemble SMB2_NETNAME_NEGOTIATE_CONTEXT_ID context\n");
1057 		} else if (pctx->ContextType == SMB2_POSIX_EXTENSIONS_AVAILABLE) {
1058 			ksmbd_debug(SMB,
1059 				    "deassemble SMB2_POSIX_EXTENSIONS_AVAILABLE context\n");
1060 			conn->posix_ext_supported = true;
1061 		} else if (pctx->ContextType == SMB2_SIGNING_CAPABILITIES) {
1062 			ksmbd_debug(SMB,
1063 				    "deassemble SMB2_SIGNING_CAPABILITIES context\n");
1064 
1065 			decode_sign_cap_ctxt(conn,
1066 					     (struct smb2_signing_capabilities *)pctx,
1067 					     ctxt_len);
1068 		}
1069 
1070 		/* offsets must be 8 byte aligned */
1071 		offset = (ctxt_len + 7) & ~0x7;
1072 		len_of_ctxts -= offset;
1073 	}
1074 	return status;
1075 }
1076 
1077 /**
1078  * smb2_handle_negotiate() - handler for smb2 negotiate command
1079  * @work:	smb work containing smb request buffer
1080  *
1081  * Return:      0
1082  */
smb2_handle_negotiate(struct ksmbd_work * work)1083 int smb2_handle_negotiate(struct ksmbd_work *work)
1084 {
1085 	struct ksmbd_conn *conn = work->conn;
1086 	struct smb2_negotiate_req *req = smb2_get_msg(work->request_buf);
1087 	struct smb2_negotiate_rsp *rsp = smb2_get_msg(work->response_buf);
1088 	int rc = 0;
1089 	unsigned int smb2_buf_len, smb2_neg_size, neg_ctxt_len = 0;
1090 	__le32 status;
1091 
1092 	ksmbd_debug(SMB, "Received negotiate request\n");
1093 	conn->need_neg = false;
1094 	if (ksmbd_conn_good(conn)) {
1095 		pr_err("conn->tcp_status is already in CifsGood State\n");
1096 		work->send_no_response = 1;
1097 		return rc;
1098 	}
1099 
1100 	ksmbd_conn_lock(conn);
1101 	smb2_buf_len = get_rfc1002_len(work->request_buf);
1102 	smb2_neg_size = offsetof(struct smb2_negotiate_req, Dialects);
1103 	if (smb2_neg_size > smb2_buf_len) {
1104 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1105 		rc = -EINVAL;
1106 		goto err_out;
1107 	}
1108 
1109 	if (req->DialectCount == 0) {
1110 		pr_err("malformed packet\n");
1111 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1112 		rc = -EINVAL;
1113 		goto err_out;
1114 	}
1115 
1116 	if (conn->dialect == SMB311_PROT_ID) {
1117 		unsigned int nego_ctxt_off = le32_to_cpu(req->NegotiateContextOffset);
1118 
1119 		if (smb2_buf_len < nego_ctxt_off) {
1120 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1121 			rc = -EINVAL;
1122 			goto err_out;
1123 		}
1124 
1125 		if (smb2_neg_size > nego_ctxt_off) {
1126 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1127 			rc = -EINVAL;
1128 			goto err_out;
1129 		}
1130 
1131 		if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
1132 		    nego_ctxt_off) {
1133 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1134 			rc = -EINVAL;
1135 			goto err_out;
1136 		}
1137 	} else {
1138 		if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
1139 		    smb2_buf_len) {
1140 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1141 			rc = -EINVAL;
1142 			goto err_out;
1143 		}
1144 	}
1145 
1146 	conn->cli_cap = le32_to_cpu(req->Capabilities);
1147 	switch (conn->dialect) {
1148 	case SMB311_PROT_ID:
1149 		conn->preauth_info =
1150 			kzalloc(sizeof(struct preauth_integrity_info),
1151 				KSMBD_DEFAULT_GFP);
1152 		if (!conn->preauth_info) {
1153 			rc = -ENOMEM;
1154 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1155 			goto err_out;
1156 		}
1157 
1158 		status = deassemble_neg_contexts(conn, req,
1159 						 get_rfc1002_len(work->request_buf));
1160 		if (status != STATUS_SUCCESS) {
1161 			pr_err("deassemble_neg_contexts error(0x%x)\n",
1162 			       status);
1163 			rsp->hdr.Status = status;
1164 			rc = -EINVAL;
1165 			kfree(conn->preauth_info);
1166 			conn->preauth_info = NULL;
1167 			goto err_out;
1168 		}
1169 
1170 		rc = init_smb3_11_server(conn);
1171 		if (rc < 0) {
1172 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1173 			kfree(conn->preauth_info);
1174 			conn->preauth_info = NULL;
1175 			goto err_out;
1176 		}
1177 
1178 		ksmbd_gen_preauth_integrity_hash(conn,
1179 						 work->request_buf,
1180 						 conn->preauth_info->Preauth_HashValue);
1181 		rsp->NegotiateContextOffset =
1182 				cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
1183 		neg_ctxt_len = assemble_neg_contexts(conn, rsp);
1184 		break;
1185 	case SMB302_PROT_ID:
1186 		init_smb3_02_server(conn);
1187 		break;
1188 	case SMB30_PROT_ID:
1189 		init_smb3_0_server(conn);
1190 		break;
1191 	case SMB21_PROT_ID:
1192 		init_smb2_1_server(conn);
1193 		break;
1194 	case SMB2X_PROT_ID:
1195 	case BAD_PROT_ID:
1196 	default:
1197 		ksmbd_debug(SMB, "Server dialect :0x%x not supported\n",
1198 			    conn->dialect);
1199 		rsp->hdr.Status = STATUS_NOT_SUPPORTED;
1200 		rc = -EINVAL;
1201 		goto err_out;
1202 	}
1203 	rsp->Capabilities = cpu_to_le32(conn->vals->capabilities);
1204 
1205 	/* For stats */
1206 	conn->connection_type = conn->dialect;
1207 
1208 	rsp->MaxTransactSize = cpu_to_le32(conn->vals->max_trans_size);
1209 	rsp->MaxReadSize = cpu_to_le32(conn->vals->max_read_size);
1210 	rsp->MaxWriteSize = cpu_to_le32(conn->vals->max_write_size);
1211 
1212 	memcpy(conn->ClientGUID, req->ClientGUID,
1213 			SMB2_CLIENT_GUID_SIZE);
1214 	conn->cli_sec_mode = le16_to_cpu(req->SecurityMode);
1215 
1216 	rsp->StructureSize = cpu_to_le16(65);
1217 	rsp->DialectRevision = cpu_to_le16(conn->dialect);
1218 	/* Not setting conn guid rsp->ServerGUID, as it
1219 	 * not used by client for identifying server
1220 	 */
1221 	memset(rsp->ServerGUID, 0, SMB2_CLIENT_GUID_SIZE);
1222 
1223 	rsp->SystemTime = cpu_to_le64(ksmbd_systime());
1224 	rsp->ServerStartTime = 0;
1225 	ksmbd_debug(SMB, "negotiate context offset %d, count %d\n",
1226 		    le32_to_cpu(rsp->NegotiateContextOffset),
1227 		    le16_to_cpu(rsp->NegotiateContextCount));
1228 
1229 	rsp->SecurityBufferOffset = cpu_to_le16(128);
1230 	rsp->SecurityBufferLength = cpu_to_le16(AUTH_GSS_LENGTH);
1231 	ksmbd_copy_gss_neg_header((char *)(&rsp->hdr) +
1232 				  le16_to_cpu(rsp->SecurityBufferOffset));
1233 
1234 	rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
1235 	conn->use_spnego = true;
1236 
1237 	if ((server_conf.signing == KSMBD_CONFIG_OPT_AUTO ||
1238 	     server_conf.signing == KSMBD_CONFIG_OPT_DISABLED) &&
1239 	    req->SecurityMode & SMB2_NEGOTIATE_SIGNING_REQUIRED_LE)
1240 		conn->sign = true;
1241 	else if (server_conf.signing == KSMBD_CONFIG_OPT_MANDATORY) {
1242 		server_conf.enforced_signing = true;
1243 		rsp->SecurityMode |= SMB2_NEGOTIATE_SIGNING_REQUIRED_LE;
1244 		conn->sign = true;
1245 	}
1246 
1247 	conn->srv_sec_mode = le16_to_cpu(rsp->SecurityMode);
1248 	ksmbd_conn_set_need_negotiate(conn);
1249 
1250 err_out:
1251 	ksmbd_conn_unlock(conn);
1252 	if (rc)
1253 		rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
1254 
1255 	if (!rc)
1256 		rc = ksmbd_iov_pin_rsp(work, rsp,
1257 				       sizeof(struct smb2_negotiate_rsp) +
1258 					AUTH_GSS_LENGTH + neg_ctxt_len);
1259 	if (rc < 0)
1260 		smb2_set_err_rsp(work);
1261 	return rc;
1262 }
1263 
alloc_preauth_hash(struct ksmbd_session * sess,struct ksmbd_conn * conn)1264 static int alloc_preauth_hash(struct ksmbd_session *sess,
1265 			      struct ksmbd_conn *conn)
1266 {
1267 	if (sess->Preauth_HashValue)
1268 		return 0;
1269 
1270 	sess->Preauth_HashValue = kmemdup(conn->preauth_info->Preauth_HashValue,
1271 					  PREAUTH_HASHVALUE_SIZE, KSMBD_DEFAULT_GFP);
1272 	if (!sess->Preauth_HashValue)
1273 		return -ENOMEM;
1274 
1275 	return 0;
1276 }
1277 
generate_preauth_hash(struct ksmbd_work * work)1278 static int generate_preauth_hash(struct ksmbd_work *work)
1279 {
1280 	struct ksmbd_conn *conn = work->conn;
1281 	struct ksmbd_session *sess = work->sess;
1282 	u8 *preauth_hash;
1283 
1284 	if (conn->dialect != SMB311_PROT_ID)
1285 		return 0;
1286 
1287 	if (conn->binding) {
1288 		struct preauth_session *preauth_sess;
1289 
1290 		preauth_sess = ksmbd_preauth_session_lookup(conn, sess->id);
1291 		if (!preauth_sess) {
1292 			preauth_sess = ksmbd_preauth_session_alloc(conn, sess->id);
1293 			if (!preauth_sess)
1294 				return -ENOMEM;
1295 		}
1296 
1297 		preauth_hash = preauth_sess->Preauth_HashValue;
1298 	} else {
1299 		if (!sess->Preauth_HashValue)
1300 			if (alloc_preauth_hash(sess, conn))
1301 				return -ENOMEM;
1302 		preauth_hash = sess->Preauth_HashValue;
1303 	}
1304 
1305 	ksmbd_gen_preauth_integrity_hash(conn, work->request_buf, preauth_hash);
1306 	return 0;
1307 }
1308 
decode_negotiation_token(struct ksmbd_conn * conn,struct negotiate_message * negblob,size_t sz)1309 static int decode_negotiation_token(struct ksmbd_conn *conn,
1310 				    struct negotiate_message *negblob,
1311 				    size_t sz)
1312 {
1313 	if (!conn->use_spnego)
1314 		return -EINVAL;
1315 
1316 	if (ksmbd_decode_negTokenInit((char *)negblob, sz, conn)) {
1317 		if (ksmbd_decode_negTokenTarg((char *)negblob, sz, conn)) {
1318 			conn->auth_mechs |= KSMBD_AUTH_NTLMSSP;
1319 			conn->preferred_auth_mech = KSMBD_AUTH_NTLMSSP;
1320 			conn->use_spnego = false;
1321 		}
1322 	}
1323 	return 0;
1324 }
1325 
ntlm_negotiate(struct ksmbd_work * work,struct negotiate_message * negblob,size_t negblob_len,struct smb2_sess_setup_rsp * rsp)1326 static int ntlm_negotiate(struct ksmbd_work *work,
1327 			  struct negotiate_message *negblob,
1328 			  size_t negblob_len, struct smb2_sess_setup_rsp *rsp)
1329 {
1330 	struct challenge_message *chgblob;
1331 	unsigned char *spnego_blob = NULL;
1332 	u16 spnego_blob_len;
1333 	char *neg_blob;
1334 	int sz, rc;
1335 
1336 	ksmbd_debug(SMB, "negotiate phase\n");
1337 	rc = ksmbd_decode_ntlmssp_neg_blob(negblob, negblob_len, work->conn);
1338 	if (rc)
1339 		return rc;
1340 
1341 	sz = le16_to_cpu(rsp->SecurityBufferOffset);
1342 	chgblob = (struct challenge_message *)rsp->Buffer;
1343 	memset(chgblob, 0, sizeof(struct challenge_message));
1344 
1345 	if (!work->conn->use_spnego) {
1346 		sz = ksmbd_build_ntlmssp_challenge_blob(chgblob, work->conn);
1347 		if (sz < 0)
1348 			return -ENOMEM;
1349 
1350 		rsp->SecurityBufferLength = cpu_to_le16(sz);
1351 		return 0;
1352 	}
1353 
1354 	sz = sizeof(struct challenge_message);
1355 	sz += (strlen(ksmbd_netbios_name()) * 2 + 1 + 4) * 6;
1356 
1357 	neg_blob = kzalloc(sz, KSMBD_DEFAULT_GFP);
1358 	if (!neg_blob)
1359 		return -ENOMEM;
1360 
1361 	chgblob = (struct challenge_message *)neg_blob;
1362 	sz = ksmbd_build_ntlmssp_challenge_blob(chgblob, work->conn);
1363 	if (sz < 0) {
1364 		rc = -ENOMEM;
1365 		goto out;
1366 	}
1367 
1368 	rc = build_spnego_ntlmssp_neg_blob(&spnego_blob, &spnego_blob_len,
1369 					   neg_blob, sz);
1370 	if (rc) {
1371 		rc = -ENOMEM;
1372 		goto out;
1373 	}
1374 
1375 	memcpy(rsp->Buffer, spnego_blob, spnego_blob_len);
1376 	rsp->SecurityBufferLength = cpu_to_le16(spnego_blob_len);
1377 
1378 out:
1379 	kfree(spnego_blob);
1380 	kfree(neg_blob);
1381 	return rc;
1382 }
1383 
user_authblob(struct ksmbd_conn * conn,struct smb2_sess_setup_req * req)1384 static struct authenticate_message *user_authblob(struct ksmbd_conn *conn,
1385 						  struct smb2_sess_setup_req *req)
1386 {
1387 	int sz;
1388 
1389 	if (conn->use_spnego && conn->mechToken)
1390 		return (struct authenticate_message *)conn->mechToken;
1391 
1392 	sz = le16_to_cpu(req->SecurityBufferOffset);
1393 	return (struct authenticate_message *)((char *)&req->hdr.ProtocolId
1394 					       + sz);
1395 }
1396 
session_user(struct ksmbd_conn * conn,struct smb2_sess_setup_req * req)1397 static struct ksmbd_user *session_user(struct ksmbd_conn *conn,
1398 				       struct smb2_sess_setup_req *req)
1399 {
1400 	struct authenticate_message *authblob;
1401 	struct ksmbd_user *user;
1402 	char *name;
1403 	unsigned int name_off, name_len, secbuf_len;
1404 
1405 	if (conn->use_spnego && conn->mechToken)
1406 		secbuf_len = conn->mechTokenLen;
1407 	else
1408 		secbuf_len = le16_to_cpu(req->SecurityBufferLength);
1409 	if (secbuf_len < sizeof(struct authenticate_message)) {
1410 		ksmbd_debug(SMB, "blob len %d too small\n", secbuf_len);
1411 		return NULL;
1412 	}
1413 	authblob = user_authblob(conn, req);
1414 	name_off = le32_to_cpu(authblob->UserName.BufferOffset);
1415 	name_len = le16_to_cpu(authblob->UserName.Length);
1416 
1417 	if (secbuf_len < (u64)name_off + name_len)
1418 		return NULL;
1419 
1420 	name = smb_strndup_from_utf16((const char *)authblob + name_off,
1421 				      name_len,
1422 				      true,
1423 				      conn->local_nls);
1424 	if (IS_ERR(name)) {
1425 		pr_err("cannot allocate memory\n");
1426 		return NULL;
1427 	}
1428 
1429 	ksmbd_debug(SMB, "session setup request for user %s\n", name);
1430 	user = ksmbd_login_user(name);
1431 	kfree(name);
1432 	return user;
1433 }
1434 
ntlm_authenticate(struct ksmbd_work * work,struct smb2_sess_setup_req * req,struct smb2_sess_setup_rsp * rsp)1435 static int ntlm_authenticate(struct ksmbd_work *work,
1436 			     struct smb2_sess_setup_req *req,
1437 			     struct smb2_sess_setup_rsp *rsp)
1438 {
1439 	struct ksmbd_conn *conn = work->conn;
1440 	struct ksmbd_session *sess = work->sess;
1441 	struct channel *chann = NULL;
1442 	struct ksmbd_user *user;
1443 	u64 prev_id;
1444 	int sz, rc;
1445 
1446 	ksmbd_debug(SMB, "authenticate phase\n");
1447 	if (conn->use_spnego) {
1448 		unsigned char *spnego_blob;
1449 		u16 spnego_blob_len;
1450 
1451 		rc = build_spnego_ntlmssp_auth_blob(&spnego_blob,
1452 						    &spnego_blob_len,
1453 						    0);
1454 		if (rc)
1455 			return -ENOMEM;
1456 
1457 		memcpy(rsp->Buffer, spnego_blob, spnego_blob_len);
1458 		rsp->SecurityBufferLength = cpu_to_le16(spnego_blob_len);
1459 		kfree(spnego_blob);
1460 	}
1461 
1462 	user = session_user(conn, req);
1463 	if (!user) {
1464 		ksmbd_debug(SMB, "Unknown user name or an error\n");
1465 		return -EPERM;
1466 	}
1467 
1468 	/* Check for previous session */
1469 	prev_id = le64_to_cpu(req->PreviousSessionId);
1470 	if (prev_id && prev_id != sess->id)
1471 		destroy_previous_session(conn, user, prev_id);
1472 
1473 	if (sess->state == SMB2_SESSION_VALID) {
1474 		/*
1475 		 * Reuse session if anonymous try to connect
1476 		 * on reauthetication.
1477 		 */
1478 		if (conn->binding == false && ksmbd_anonymous_user(user)) {
1479 			ksmbd_free_user(user);
1480 			return 0;
1481 		}
1482 
1483 		if (!ksmbd_compare_user(sess->user, user)) {
1484 			ksmbd_free_user(user);
1485 			return -EPERM;
1486 		}
1487 		ksmbd_free_user(user);
1488 	} else {
1489 		sess->user = user;
1490 	}
1491 
1492 	if (conn->binding == false && user_guest(sess->user)) {
1493 		rsp->SessionFlags = SMB2_SESSION_FLAG_IS_GUEST_LE;
1494 	} else {
1495 		struct authenticate_message *authblob;
1496 
1497 		authblob = user_authblob(conn, req);
1498 		if (conn->use_spnego && conn->mechToken)
1499 			sz = conn->mechTokenLen;
1500 		else
1501 			sz = le16_to_cpu(req->SecurityBufferLength);
1502 		rc = ksmbd_decode_ntlmssp_auth_blob(authblob, sz, conn, sess);
1503 		if (rc) {
1504 			set_user_flag(sess->user, KSMBD_USER_FLAG_BAD_PASSWORD);
1505 			ksmbd_debug(SMB, "authentication failed\n");
1506 			return -EPERM;
1507 		}
1508 	}
1509 
1510 	/*
1511 	 * If session state is SMB2_SESSION_VALID, We can assume
1512 	 * that it is reauthentication. And the user/password
1513 	 * has been verified, so return it here.
1514 	 */
1515 	if (sess->state == SMB2_SESSION_VALID) {
1516 		if (conn->binding)
1517 			goto binding_session;
1518 		return 0;
1519 	}
1520 
1521 	if ((rsp->SessionFlags != SMB2_SESSION_FLAG_IS_GUEST_LE &&
1522 	     (conn->sign || server_conf.enforced_signing)) ||
1523 	    (req->SecurityMode & SMB2_NEGOTIATE_SIGNING_REQUIRED))
1524 		sess->sign = true;
1525 
1526 	if (smb3_encryption_negotiated(conn) &&
1527 			!(req->Flags & SMB2_SESSION_REQ_FLAG_BINDING)) {
1528 		rc = conn->ops->generate_encryptionkey(conn, sess);
1529 		if (rc) {
1530 			ksmbd_debug(SMB,
1531 					"SMB3 encryption key generation failed\n");
1532 			return -EINVAL;
1533 		}
1534 		sess->enc = true;
1535 		if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION)
1536 			rsp->SessionFlags = SMB2_SESSION_FLAG_ENCRYPT_DATA_LE;
1537 		/*
1538 		 * signing is disable if encryption is enable
1539 		 * on this session
1540 		 */
1541 		sess->sign = false;
1542 	}
1543 
1544 binding_session:
1545 	if (conn->dialect >= SMB30_PROT_ID) {
1546 		chann = lookup_chann_list(sess, conn);
1547 		if (!chann) {
1548 			chann = kmalloc(sizeof(struct channel), KSMBD_DEFAULT_GFP);
1549 			if (!chann)
1550 				return -ENOMEM;
1551 
1552 			chann->conn = conn;
1553 			xa_store(&sess->ksmbd_chann_list, (long)conn, chann, KSMBD_DEFAULT_GFP);
1554 		}
1555 	}
1556 
1557 	if (conn->ops->generate_signingkey) {
1558 		rc = conn->ops->generate_signingkey(sess, conn);
1559 		if (rc) {
1560 			ksmbd_debug(SMB, "SMB3 signing key generation failed\n");
1561 			return -EINVAL;
1562 		}
1563 	}
1564 
1565 	if (!ksmbd_conn_lookup_dialect(conn)) {
1566 		pr_err("fail to verify the dialect\n");
1567 		return -ENOENT;
1568 	}
1569 	return 0;
1570 }
1571 
1572 #ifdef CONFIG_SMB_SERVER_KERBEROS5
krb5_authenticate(struct ksmbd_work * work,struct smb2_sess_setup_req * req,struct smb2_sess_setup_rsp * rsp)1573 static int krb5_authenticate(struct ksmbd_work *work,
1574 			     struct smb2_sess_setup_req *req,
1575 			     struct smb2_sess_setup_rsp *rsp)
1576 {
1577 	struct ksmbd_conn *conn = work->conn;
1578 	struct ksmbd_session *sess = work->sess;
1579 	char *in_blob, *out_blob;
1580 	struct channel *chann = NULL;
1581 	u64 prev_sess_id;
1582 	int in_len, out_len;
1583 	int retval;
1584 
1585 	in_blob = (char *)&req->hdr.ProtocolId +
1586 		le16_to_cpu(req->SecurityBufferOffset);
1587 	in_len = le16_to_cpu(req->SecurityBufferLength);
1588 	out_blob = (char *)&rsp->hdr.ProtocolId +
1589 		le16_to_cpu(rsp->SecurityBufferOffset);
1590 	out_len = work->response_sz -
1591 		(le16_to_cpu(rsp->SecurityBufferOffset) + 4);
1592 
1593 	/* Check previous session */
1594 	prev_sess_id = le64_to_cpu(req->PreviousSessionId);
1595 	if (prev_sess_id && prev_sess_id != sess->id)
1596 		destroy_previous_session(conn, sess->user, prev_sess_id);
1597 
1598 	if (sess->state == SMB2_SESSION_VALID)
1599 		ksmbd_free_user(sess->user);
1600 
1601 	retval = ksmbd_krb5_authenticate(sess, in_blob, in_len,
1602 					 out_blob, &out_len);
1603 	if (retval) {
1604 		ksmbd_debug(SMB, "krb5 authentication failed\n");
1605 		return -EINVAL;
1606 	}
1607 	rsp->SecurityBufferLength = cpu_to_le16(out_len);
1608 
1609 	if ((conn->sign || server_conf.enforced_signing) ||
1610 	    (req->SecurityMode & SMB2_NEGOTIATE_SIGNING_REQUIRED))
1611 		sess->sign = true;
1612 
1613 	if (smb3_encryption_negotiated(conn)) {
1614 		retval = conn->ops->generate_encryptionkey(conn, sess);
1615 		if (retval) {
1616 			ksmbd_debug(SMB,
1617 				    "SMB3 encryption key generation failed\n");
1618 			return -EINVAL;
1619 		}
1620 		sess->enc = true;
1621 		if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION)
1622 			rsp->SessionFlags = SMB2_SESSION_FLAG_ENCRYPT_DATA_LE;
1623 		sess->sign = false;
1624 	}
1625 
1626 	if (conn->dialect >= SMB30_PROT_ID) {
1627 		chann = lookup_chann_list(sess, conn);
1628 		if (!chann) {
1629 			chann = kmalloc(sizeof(struct channel), KSMBD_DEFAULT_GFP);
1630 			if (!chann)
1631 				return -ENOMEM;
1632 
1633 			chann->conn = conn;
1634 			xa_store(&sess->ksmbd_chann_list, (long)conn, chann, KSMBD_DEFAULT_GFP);
1635 		}
1636 	}
1637 
1638 	if (conn->ops->generate_signingkey) {
1639 		retval = conn->ops->generate_signingkey(sess, conn);
1640 		if (retval) {
1641 			ksmbd_debug(SMB, "SMB3 signing key generation failed\n");
1642 			return -EINVAL;
1643 		}
1644 	}
1645 
1646 	if (!ksmbd_conn_lookup_dialect(conn)) {
1647 		pr_err("fail to verify the dialect\n");
1648 		return -ENOENT;
1649 	}
1650 	return 0;
1651 }
1652 #else
krb5_authenticate(struct ksmbd_work * work,struct smb2_sess_setup_req * req,struct smb2_sess_setup_rsp * rsp)1653 static int krb5_authenticate(struct ksmbd_work *work,
1654 			     struct smb2_sess_setup_req *req,
1655 			     struct smb2_sess_setup_rsp *rsp)
1656 {
1657 	return -EOPNOTSUPP;
1658 }
1659 #endif
1660 
smb2_sess_setup(struct ksmbd_work * work)1661 int smb2_sess_setup(struct ksmbd_work *work)
1662 {
1663 	struct ksmbd_conn *conn = work->conn;
1664 	struct smb2_sess_setup_req *req;
1665 	struct smb2_sess_setup_rsp *rsp;
1666 	struct ksmbd_session *sess;
1667 	struct negotiate_message *negblob;
1668 	unsigned int negblob_len, negblob_off;
1669 	int rc = 0;
1670 
1671 	ksmbd_debug(SMB, "Received smb2 session setup request\n");
1672 
1673 	WORK_BUFFERS(work, req, rsp);
1674 
1675 	rsp->StructureSize = cpu_to_le16(9);
1676 	rsp->SessionFlags = 0;
1677 	rsp->SecurityBufferOffset = cpu_to_le16(72);
1678 	rsp->SecurityBufferLength = 0;
1679 
1680 	ksmbd_conn_lock(conn);
1681 	if (!req->hdr.SessionId) {
1682 		sess = ksmbd_smb2_session_create();
1683 		if (!sess) {
1684 			rc = -ENOMEM;
1685 			goto out_err;
1686 		}
1687 		rsp->hdr.SessionId = cpu_to_le64(sess->id);
1688 		rc = ksmbd_session_register(conn, sess);
1689 		if (rc)
1690 			goto out_err;
1691 
1692 		conn->binding = false;
1693 	} else if (conn->dialect >= SMB30_PROT_ID &&
1694 		   (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL) &&
1695 		   req->Flags & SMB2_SESSION_REQ_FLAG_BINDING) {
1696 		u64 sess_id = le64_to_cpu(req->hdr.SessionId);
1697 
1698 		sess = ksmbd_session_lookup_slowpath(sess_id);
1699 		if (!sess) {
1700 			rc = -ENOENT;
1701 			goto out_err;
1702 		}
1703 
1704 		if (conn->dialect != sess->dialect) {
1705 			rc = -EINVAL;
1706 			ksmbd_user_session_put(sess);
1707 			goto out_err;
1708 		}
1709 
1710 		if (!(req->hdr.Flags & SMB2_FLAGS_SIGNED)) {
1711 			rc = -EINVAL;
1712 			ksmbd_user_session_put(sess);
1713 			goto out_err;
1714 		}
1715 
1716 		if (strncmp(conn->ClientGUID, sess->ClientGUID,
1717 			    SMB2_CLIENT_GUID_SIZE)) {
1718 			rc = -ENOENT;
1719 			ksmbd_user_session_put(sess);
1720 			goto out_err;
1721 		}
1722 
1723 		if (sess->state == SMB2_SESSION_IN_PROGRESS) {
1724 			rc = -EACCES;
1725 			ksmbd_user_session_put(sess);
1726 			goto out_err;
1727 		}
1728 
1729 		if (sess->state == SMB2_SESSION_EXPIRED) {
1730 			rc = -EFAULT;
1731 			ksmbd_user_session_put(sess);
1732 			goto out_err;
1733 		}
1734 		ksmbd_user_session_put(sess);
1735 
1736 		if (ksmbd_conn_need_reconnect(conn)) {
1737 			rc = -EFAULT;
1738 			sess = NULL;
1739 			goto out_err;
1740 		}
1741 
1742 		sess = ksmbd_session_lookup(conn, sess_id);
1743 		if (!sess) {
1744 			rc = -EACCES;
1745 			goto out_err;
1746 		}
1747 
1748 		if (user_guest(sess->user)) {
1749 			rc = -EOPNOTSUPP;
1750 			goto out_err;
1751 		}
1752 
1753 		conn->binding = true;
1754 	} else if ((conn->dialect < SMB30_PROT_ID ||
1755 		    server_conf.flags & KSMBD_GLOBAL_FLAG_SMB3_MULTICHANNEL) &&
1756 		   (req->Flags & SMB2_SESSION_REQ_FLAG_BINDING)) {
1757 		sess = NULL;
1758 		rc = -EACCES;
1759 		goto out_err;
1760 	} else {
1761 		sess = ksmbd_session_lookup(conn,
1762 					    le64_to_cpu(req->hdr.SessionId));
1763 		if (!sess) {
1764 			rc = -ENOENT;
1765 			goto out_err;
1766 		}
1767 
1768 		if (sess->state == SMB2_SESSION_EXPIRED) {
1769 			rc = -EFAULT;
1770 			goto out_err;
1771 		}
1772 
1773 		if (ksmbd_conn_need_reconnect(conn)) {
1774 			rc = -EFAULT;
1775 			sess = NULL;
1776 			goto out_err;
1777 		}
1778 
1779 		conn->binding = false;
1780 	}
1781 	work->sess = sess;
1782 
1783 	negblob_off = le16_to_cpu(req->SecurityBufferOffset);
1784 	negblob_len = le16_to_cpu(req->SecurityBufferLength);
1785 	if (negblob_off < offsetof(struct smb2_sess_setup_req, Buffer)) {
1786 		rc = -EINVAL;
1787 		goto out_err;
1788 	}
1789 
1790 	negblob = (struct negotiate_message *)((char *)&req->hdr.ProtocolId +
1791 			negblob_off);
1792 
1793 	if (decode_negotiation_token(conn, negblob, negblob_len) == 0) {
1794 		if (conn->mechToken) {
1795 			negblob = (struct negotiate_message *)conn->mechToken;
1796 			negblob_len = conn->mechTokenLen;
1797 		}
1798 	}
1799 
1800 	if (negblob_len < offsetof(struct negotiate_message, NegotiateFlags)) {
1801 		rc = -EINVAL;
1802 		goto out_err;
1803 	}
1804 
1805 	if (server_conf.auth_mechs & conn->auth_mechs) {
1806 		rc = generate_preauth_hash(work);
1807 		if (rc)
1808 			goto out_err;
1809 
1810 		if (conn->preferred_auth_mech &
1811 				(KSMBD_AUTH_KRB5 | KSMBD_AUTH_MSKRB5)) {
1812 			rc = krb5_authenticate(work, req, rsp);
1813 			if (rc) {
1814 				rc = -EINVAL;
1815 				goto out_err;
1816 			}
1817 
1818 			if (!ksmbd_conn_need_reconnect(conn)) {
1819 				ksmbd_conn_set_good(conn);
1820 				sess->state = SMB2_SESSION_VALID;
1821 			}
1822 			kfree(sess->Preauth_HashValue);
1823 			sess->Preauth_HashValue = NULL;
1824 		} else if (conn->preferred_auth_mech == KSMBD_AUTH_NTLMSSP) {
1825 			if (negblob->MessageType == NtLmNegotiate) {
1826 				rc = ntlm_negotiate(work, negblob, negblob_len, rsp);
1827 				if (rc)
1828 					goto out_err;
1829 				rsp->hdr.Status =
1830 					STATUS_MORE_PROCESSING_REQUIRED;
1831 			} else if (negblob->MessageType == NtLmAuthenticate) {
1832 				rc = ntlm_authenticate(work, req, rsp);
1833 				if (rc)
1834 					goto out_err;
1835 
1836 				if (!ksmbd_conn_need_reconnect(conn)) {
1837 					ksmbd_conn_set_good(conn);
1838 					sess->state = SMB2_SESSION_VALID;
1839 				}
1840 				if (conn->binding) {
1841 					struct preauth_session *preauth_sess;
1842 
1843 					preauth_sess =
1844 						ksmbd_preauth_session_lookup(conn, sess->id);
1845 					if (preauth_sess) {
1846 						list_del(&preauth_sess->preauth_entry);
1847 						kfree(preauth_sess);
1848 					}
1849 				}
1850 				kfree(sess->Preauth_HashValue);
1851 				sess->Preauth_HashValue = NULL;
1852 			} else {
1853 				pr_info_ratelimited("Unknown NTLMSSP message type : 0x%x\n",
1854 						le32_to_cpu(negblob->MessageType));
1855 				rc = -EINVAL;
1856 			}
1857 		} else {
1858 			/* TODO: need one more negotiation */
1859 			pr_err("Not support the preferred authentication\n");
1860 			rc = -EINVAL;
1861 		}
1862 	} else {
1863 		pr_err("Not support authentication\n");
1864 		rc = -EINVAL;
1865 	}
1866 
1867 out_err:
1868 	if (rc == -EINVAL)
1869 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
1870 	else if (rc == -ENOENT)
1871 		rsp->hdr.Status = STATUS_USER_SESSION_DELETED;
1872 	else if (rc == -EACCES)
1873 		rsp->hdr.Status = STATUS_REQUEST_NOT_ACCEPTED;
1874 	else if (rc == -EFAULT)
1875 		rsp->hdr.Status = STATUS_NETWORK_SESSION_EXPIRED;
1876 	else if (rc == -ENOMEM)
1877 		rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
1878 	else if (rc == -EOPNOTSUPP)
1879 		rsp->hdr.Status = STATUS_NOT_SUPPORTED;
1880 	else if (rc)
1881 		rsp->hdr.Status = STATUS_LOGON_FAILURE;
1882 
1883 	if (conn->use_spnego && conn->mechToken) {
1884 		kfree(conn->mechToken);
1885 		conn->mechToken = NULL;
1886 	}
1887 
1888 	if (rc < 0) {
1889 		/*
1890 		 * SecurityBufferOffset should be set to zero
1891 		 * in session setup error response.
1892 		 */
1893 		rsp->SecurityBufferOffset = 0;
1894 
1895 		if (sess) {
1896 			bool try_delay = false;
1897 
1898 			/*
1899 			 * To avoid dictionary attacks (repeated session setups rapidly sent) to
1900 			 * connect to server, ksmbd make a delay of a 5 seconds on session setup
1901 			 * failure to make it harder to send enough random connection requests
1902 			 * to break into a server.
1903 			 */
1904 			if (sess->user && sess->user->flags & KSMBD_USER_FLAG_DELAY_SESSION)
1905 				try_delay = true;
1906 
1907 			sess->last_active = jiffies;
1908 			sess->state = SMB2_SESSION_EXPIRED;
1909 			if (try_delay) {
1910 				ksmbd_conn_set_need_reconnect(conn);
1911 				ssleep(5);
1912 				ksmbd_conn_set_need_negotiate(conn);
1913 			}
1914 		}
1915 		smb2_set_err_rsp(work);
1916 	} else {
1917 		unsigned int iov_len;
1918 
1919 		if (rsp->SecurityBufferLength)
1920 			iov_len = offsetof(struct smb2_sess_setup_rsp, Buffer) +
1921 				le16_to_cpu(rsp->SecurityBufferLength);
1922 		else
1923 			iov_len = sizeof(struct smb2_sess_setup_rsp);
1924 		rc = ksmbd_iov_pin_rsp(work, rsp, iov_len);
1925 		if (rc)
1926 			rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
1927 	}
1928 
1929 	ksmbd_conn_unlock(conn);
1930 	return rc;
1931 }
1932 
1933 /**
1934  * smb2_tree_connect() - handler for smb2 tree connect command
1935  * @work:	smb work containing smb request buffer
1936  *
1937  * Return:      0 on success, otherwise error
1938  */
smb2_tree_connect(struct ksmbd_work * work)1939 int smb2_tree_connect(struct ksmbd_work *work)
1940 {
1941 	struct ksmbd_conn *conn = work->conn;
1942 	struct smb2_tree_connect_req *req;
1943 	struct smb2_tree_connect_rsp *rsp;
1944 	struct ksmbd_session *sess = work->sess;
1945 	char *treename = NULL, *name = NULL;
1946 	struct ksmbd_tree_conn_status status;
1947 	struct ksmbd_share_config *share = NULL;
1948 	int rc = -EINVAL;
1949 
1950 	ksmbd_debug(SMB, "Received smb2 tree connect request\n");
1951 
1952 	WORK_BUFFERS(work, req, rsp);
1953 
1954 	treename = smb_strndup_from_utf16((char *)req + le16_to_cpu(req->PathOffset),
1955 					  le16_to_cpu(req->PathLength), true,
1956 					  conn->local_nls);
1957 	if (IS_ERR(treename)) {
1958 		pr_err("treename is NULL\n");
1959 		status.ret = KSMBD_TREE_CONN_STATUS_ERROR;
1960 		goto out_err1;
1961 	}
1962 
1963 	name = ksmbd_extract_sharename(conn->um, treename);
1964 	if (IS_ERR(name)) {
1965 		status.ret = KSMBD_TREE_CONN_STATUS_ERROR;
1966 		goto out_err1;
1967 	}
1968 
1969 	ksmbd_debug(SMB, "tree connect request for tree %s treename %s\n",
1970 		    name, treename);
1971 
1972 	status = ksmbd_tree_conn_connect(work, name);
1973 	if (status.ret == KSMBD_TREE_CONN_STATUS_OK)
1974 		rsp->hdr.Id.SyncId.TreeId = cpu_to_le32(status.tree_conn->id);
1975 	else
1976 		goto out_err1;
1977 
1978 	share = status.tree_conn->share_conf;
1979 	if (test_share_config_flag(share, KSMBD_SHARE_FLAG_PIPE)) {
1980 		ksmbd_debug(SMB, "IPC share path request\n");
1981 		rsp->ShareType = SMB2_SHARE_TYPE_PIPE;
1982 		rsp->MaximalAccess = FILE_READ_DATA_LE | FILE_READ_EA_LE |
1983 			FILE_EXECUTE_LE | FILE_READ_ATTRIBUTES_LE |
1984 			FILE_DELETE_LE | FILE_READ_CONTROL_LE |
1985 			FILE_WRITE_DAC_LE | FILE_WRITE_OWNER_LE |
1986 			FILE_SYNCHRONIZE_LE;
1987 	} else {
1988 		rsp->ShareType = SMB2_SHARE_TYPE_DISK;
1989 		rsp->MaximalAccess = FILE_READ_DATA_LE | FILE_READ_EA_LE |
1990 			FILE_EXECUTE_LE | FILE_READ_ATTRIBUTES_LE;
1991 		if (test_tree_conn_flag(status.tree_conn,
1992 					KSMBD_TREE_CONN_FLAG_WRITABLE)) {
1993 			rsp->MaximalAccess |= FILE_WRITE_DATA_LE |
1994 				FILE_APPEND_DATA_LE | FILE_WRITE_EA_LE |
1995 				FILE_DELETE_LE | FILE_WRITE_ATTRIBUTES_LE |
1996 				FILE_DELETE_CHILD_LE | FILE_READ_CONTROL_LE |
1997 				FILE_WRITE_DAC_LE | FILE_WRITE_OWNER_LE |
1998 				FILE_SYNCHRONIZE_LE;
1999 		}
2000 	}
2001 
2002 	status.tree_conn->maximal_access = le32_to_cpu(rsp->MaximalAccess);
2003 	if (conn->posix_ext_supported)
2004 		status.tree_conn->posix_extensions = true;
2005 
2006 	write_lock(&sess->tree_conns_lock);
2007 	status.tree_conn->t_state = TREE_CONNECTED;
2008 	write_unlock(&sess->tree_conns_lock);
2009 	rsp->StructureSize = cpu_to_le16(16);
2010 out_err1:
2011 	if (server_conf.flags & KSMBD_GLOBAL_FLAG_DURABLE_HANDLE && share &&
2012 	    test_share_config_flag(share,
2013 				   KSMBD_SHARE_FLAG_CONTINUOUS_AVAILABILITY))
2014 		rsp->Capabilities = SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY;
2015 	else
2016 		rsp->Capabilities = 0;
2017 	rsp->Reserved = 0;
2018 	/* default manual caching */
2019 	rsp->ShareFlags = SMB2_SHAREFLAG_MANUAL_CACHING;
2020 
2021 	rc = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_tree_connect_rsp));
2022 	if (rc)
2023 		status.ret = KSMBD_TREE_CONN_STATUS_NOMEM;
2024 
2025 	if (!IS_ERR(treename))
2026 		kfree(treename);
2027 	if (!IS_ERR(name))
2028 		kfree(name);
2029 
2030 	switch (status.ret) {
2031 	case KSMBD_TREE_CONN_STATUS_OK:
2032 		rsp->hdr.Status = STATUS_SUCCESS;
2033 		rc = 0;
2034 		break;
2035 	case -ESTALE:
2036 	case -ENOENT:
2037 	case KSMBD_TREE_CONN_STATUS_NO_SHARE:
2038 		rsp->hdr.Status = STATUS_BAD_NETWORK_NAME;
2039 		break;
2040 	case -ENOMEM:
2041 	case KSMBD_TREE_CONN_STATUS_NOMEM:
2042 		rsp->hdr.Status = STATUS_NO_MEMORY;
2043 		break;
2044 	case KSMBD_TREE_CONN_STATUS_ERROR:
2045 	case KSMBD_TREE_CONN_STATUS_TOO_MANY_CONNS:
2046 	case KSMBD_TREE_CONN_STATUS_TOO_MANY_SESSIONS:
2047 		rsp->hdr.Status = STATUS_ACCESS_DENIED;
2048 		break;
2049 	case -EINVAL:
2050 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
2051 		break;
2052 	default:
2053 		rsp->hdr.Status = STATUS_ACCESS_DENIED;
2054 	}
2055 
2056 	if (status.ret != KSMBD_TREE_CONN_STATUS_OK)
2057 		smb2_set_err_rsp(work);
2058 
2059 	return rc;
2060 }
2061 
2062 /**
2063  * smb2_create_open_flags() - convert smb open flags to unix open flags
2064  * @file_present:	is file already present
2065  * @access:		file access flags
2066  * @disposition:	file disposition flags
2067  * @may_flags:		set with MAY_ flags
2068  * @coptions:		file creation options
2069  * @mode:		file mode
2070  *
2071  * Return:      file open flags
2072  */
smb2_create_open_flags(bool file_present,__le32 access,__le32 disposition,int * may_flags,__le32 coptions,umode_t mode)2073 static int smb2_create_open_flags(bool file_present, __le32 access,
2074 				  __le32 disposition,
2075 				  int *may_flags,
2076 				  __le32 coptions,
2077 				  umode_t mode)
2078 {
2079 	int oflags = O_NONBLOCK | O_LARGEFILE;
2080 
2081 	if (coptions & FILE_DIRECTORY_FILE_LE || S_ISDIR(mode)) {
2082 		access &= ~FILE_WRITE_DESIRE_ACCESS_LE;
2083 		ksmbd_debug(SMB, "Discard write access to a directory\n");
2084 	}
2085 
2086 	if (access & FILE_READ_DESIRED_ACCESS_LE &&
2087 	    access & FILE_WRITE_DESIRE_ACCESS_LE) {
2088 		oflags |= O_RDWR;
2089 		*may_flags = MAY_OPEN | MAY_READ | MAY_WRITE;
2090 	} else if (access & FILE_WRITE_DESIRE_ACCESS_LE) {
2091 		oflags |= O_WRONLY;
2092 		*may_flags = MAY_OPEN | MAY_WRITE;
2093 	} else {
2094 		oflags |= O_RDONLY;
2095 		*may_flags = MAY_OPEN | MAY_READ;
2096 	}
2097 
2098 	if (access == FILE_READ_ATTRIBUTES_LE || S_ISBLK(mode) || S_ISCHR(mode))
2099 		oflags |= O_PATH;
2100 
2101 	if (file_present) {
2102 		switch (disposition & FILE_CREATE_MASK_LE) {
2103 		case FILE_OPEN_LE:
2104 		case FILE_CREATE_LE:
2105 			break;
2106 		case FILE_SUPERSEDE_LE:
2107 		case FILE_OVERWRITE_LE:
2108 		case FILE_OVERWRITE_IF_LE:
2109 			oflags |= O_TRUNC;
2110 			break;
2111 		default:
2112 			break;
2113 		}
2114 	} else {
2115 		switch (disposition & FILE_CREATE_MASK_LE) {
2116 		case FILE_SUPERSEDE_LE:
2117 		case FILE_CREATE_LE:
2118 		case FILE_OPEN_IF_LE:
2119 		case FILE_OVERWRITE_IF_LE:
2120 			oflags |= O_CREAT;
2121 			break;
2122 		case FILE_OPEN_LE:
2123 		case FILE_OVERWRITE_LE:
2124 			oflags &= ~O_CREAT;
2125 			break;
2126 		default:
2127 			break;
2128 		}
2129 	}
2130 
2131 	return oflags;
2132 }
2133 
2134 /**
2135  * smb2_tree_disconnect() - handler for smb tree connect request
2136  * @work:	smb work containing request buffer
2137  *
2138  * Return:      0
2139  */
smb2_tree_disconnect(struct ksmbd_work * work)2140 int smb2_tree_disconnect(struct ksmbd_work *work)
2141 {
2142 	struct smb2_tree_disconnect_rsp *rsp;
2143 	struct smb2_tree_disconnect_req *req;
2144 	struct ksmbd_session *sess = work->sess;
2145 	struct ksmbd_tree_connect *tcon = work->tcon;
2146 	int err;
2147 
2148 	ksmbd_debug(SMB, "Received smb2 tree disconnect request\n");
2149 
2150 	WORK_BUFFERS(work, req, rsp);
2151 
2152 	if (!tcon) {
2153 		ksmbd_debug(SMB, "Invalid tid %d\n", req->hdr.Id.SyncId.TreeId);
2154 
2155 		rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED;
2156 		err = -ENOENT;
2157 		goto err_out;
2158 	}
2159 
2160 	ksmbd_close_tree_conn_fds(work);
2161 
2162 	write_lock(&sess->tree_conns_lock);
2163 	if (tcon->t_state == TREE_DISCONNECTED) {
2164 		write_unlock(&sess->tree_conns_lock);
2165 		rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED;
2166 		err = -ENOENT;
2167 		goto err_out;
2168 	}
2169 
2170 	WARN_ON_ONCE(atomic_dec_and_test(&tcon->refcount));
2171 	tcon->t_state = TREE_DISCONNECTED;
2172 	write_unlock(&sess->tree_conns_lock);
2173 
2174 	err = ksmbd_tree_conn_disconnect(sess, tcon);
2175 	if (err) {
2176 		rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED;
2177 		goto err_out;
2178 	}
2179 
2180 	work->tcon = NULL;
2181 
2182 	rsp->StructureSize = cpu_to_le16(4);
2183 	err = ksmbd_iov_pin_rsp(work, rsp,
2184 				sizeof(struct smb2_tree_disconnect_rsp));
2185 	if (err) {
2186 		rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
2187 		goto err_out;
2188 	}
2189 
2190 	return 0;
2191 
2192 err_out:
2193 	smb2_set_err_rsp(work);
2194 	return err;
2195 
2196 }
2197 
2198 /**
2199  * smb2_session_logoff() - handler for session log off request
2200  * @work:	smb work containing request buffer
2201  *
2202  * Return:      0
2203  */
smb2_session_logoff(struct ksmbd_work * work)2204 int smb2_session_logoff(struct ksmbd_work *work)
2205 {
2206 	struct ksmbd_conn *conn = work->conn;
2207 	struct ksmbd_session *sess = work->sess;
2208 	struct smb2_logoff_req *req;
2209 	struct smb2_logoff_rsp *rsp;
2210 	u64 sess_id;
2211 	int err;
2212 
2213 	WORK_BUFFERS(work, req, rsp);
2214 
2215 	ksmbd_debug(SMB, "Received smb2 session logoff request\n");
2216 
2217 	ksmbd_conn_lock(conn);
2218 	if (!ksmbd_conn_good(conn)) {
2219 		ksmbd_conn_unlock(conn);
2220 		rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED;
2221 		smb2_set_err_rsp(work);
2222 		return -ENOENT;
2223 	}
2224 	sess_id = le64_to_cpu(req->hdr.SessionId);
2225 	ksmbd_all_conn_set_status(sess_id, KSMBD_SESS_NEED_RECONNECT);
2226 	ksmbd_conn_unlock(conn);
2227 
2228 	ksmbd_close_session_fds(work);
2229 	ksmbd_conn_wait_idle(conn);
2230 
2231 	if (ksmbd_tree_conn_session_logoff(sess)) {
2232 		ksmbd_debug(SMB, "Invalid tid %d\n", req->hdr.Id.SyncId.TreeId);
2233 		rsp->hdr.Status = STATUS_NETWORK_NAME_DELETED;
2234 		smb2_set_err_rsp(work);
2235 		return -ENOENT;
2236 	}
2237 
2238 	ksmbd_destroy_file_table(&sess->file_table);
2239 	down_write(&conn->session_lock);
2240 	sess->state = SMB2_SESSION_EXPIRED;
2241 	up_write(&conn->session_lock);
2242 
2243 	ksmbd_free_user(sess->user);
2244 	sess->user = NULL;
2245 	ksmbd_all_conn_set_status(sess_id, KSMBD_SESS_NEED_NEGOTIATE);
2246 
2247 	rsp->StructureSize = cpu_to_le16(4);
2248 	err = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_logoff_rsp));
2249 	if (err) {
2250 		rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
2251 		smb2_set_err_rsp(work);
2252 		return err;
2253 	}
2254 	return 0;
2255 }
2256 
2257 /**
2258  * create_smb2_pipe() - create IPC pipe
2259  * @work:	smb work containing request buffer
2260  *
2261  * Return:      0 on success, otherwise error
2262  */
create_smb2_pipe(struct ksmbd_work * work)2263 static noinline int create_smb2_pipe(struct ksmbd_work *work)
2264 {
2265 	struct smb2_create_rsp *rsp;
2266 	struct smb2_create_req *req;
2267 	int id;
2268 	int err;
2269 	char *name;
2270 
2271 	WORK_BUFFERS(work, req, rsp);
2272 
2273 	name = smb_strndup_from_utf16(req->Buffer, le16_to_cpu(req->NameLength),
2274 				      1, work->conn->local_nls);
2275 	if (IS_ERR(name)) {
2276 		rsp->hdr.Status = STATUS_NO_MEMORY;
2277 		err = PTR_ERR(name);
2278 		goto out;
2279 	}
2280 
2281 	id = ksmbd_session_rpc_open(work->sess, name);
2282 	if (id < 0) {
2283 		pr_err("Unable to open RPC pipe: %d\n", id);
2284 		err = id;
2285 		goto out;
2286 	}
2287 
2288 	rsp->hdr.Status = STATUS_SUCCESS;
2289 	rsp->StructureSize = cpu_to_le16(89);
2290 	rsp->OplockLevel = SMB2_OPLOCK_LEVEL_NONE;
2291 	rsp->Flags = 0;
2292 	rsp->CreateAction = cpu_to_le32(FILE_OPENED);
2293 
2294 	rsp->CreationTime = cpu_to_le64(0);
2295 	rsp->LastAccessTime = cpu_to_le64(0);
2296 	rsp->ChangeTime = cpu_to_le64(0);
2297 	rsp->AllocationSize = cpu_to_le64(0);
2298 	rsp->EndofFile = cpu_to_le64(0);
2299 	rsp->FileAttributes = FILE_ATTRIBUTE_NORMAL_LE;
2300 	rsp->Reserved2 = 0;
2301 	rsp->VolatileFileId = id;
2302 	rsp->PersistentFileId = 0;
2303 	rsp->CreateContextsOffset = 0;
2304 	rsp->CreateContextsLength = 0;
2305 
2306 	err = ksmbd_iov_pin_rsp(work, rsp, offsetof(struct smb2_create_rsp, Buffer));
2307 	if (err)
2308 		goto out;
2309 
2310 	kfree(name);
2311 	return 0;
2312 
2313 out:
2314 	switch (err) {
2315 	case -EINVAL:
2316 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
2317 		break;
2318 	case -ENOSPC:
2319 	case -ENOMEM:
2320 		rsp->hdr.Status = STATUS_NO_MEMORY;
2321 		break;
2322 	}
2323 
2324 	if (!IS_ERR(name))
2325 		kfree(name);
2326 
2327 	smb2_set_err_rsp(work);
2328 	return err;
2329 }
2330 
2331 /**
2332  * smb2_set_ea() - handler for setting extended attributes using set
2333  *		info command
2334  * @eabuf:	set info command buffer
2335  * @buf_len:	set info command buffer length
2336  * @path:	dentry path for get ea
2337  * @get_write:	get write access to a mount
2338  *
2339  * Return:	0 on success, otherwise error
2340  */
smb2_set_ea(struct smb2_ea_info * eabuf,unsigned int buf_len,const struct path * path,bool get_write)2341 static int smb2_set_ea(struct smb2_ea_info *eabuf, unsigned int buf_len,
2342 		       const struct path *path, bool get_write)
2343 {
2344 	struct mnt_idmap *idmap = mnt_idmap(path->mnt);
2345 	char *attr_name = NULL, *value;
2346 	int rc = 0;
2347 	unsigned int next = 0;
2348 
2349 	if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength +
2350 			le16_to_cpu(eabuf->EaValueLength))
2351 		return -EINVAL;
2352 
2353 	attr_name = kmalloc(XATTR_NAME_MAX + 1, KSMBD_DEFAULT_GFP);
2354 	if (!attr_name)
2355 		return -ENOMEM;
2356 
2357 	do {
2358 		if (!eabuf->EaNameLength)
2359 			goto next;
2360 
2361 		ksmbd_debug(SMB,
2362 			    "name : <%s>, name_len : %u, value_len : %u, next : %u\n",
2363 			    eabuf->name, eabuf->EaNameLength,
2364 			    le16_to_cpu(eabuf->EaValueLength),
2365 			    le32_to_cpu(eabuf->NextEntryOffset));
2366 
2367 		if (eabuf->EaNameLength >
2368 		    (XATTR_NAME_MAX - XATTR_USER_PREFIX_LEN)) {
2369 			rc = -EINVAL;
2370 			break;
2371 		}
2372 
2373 		memcpy(attr_name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
2374 		memcpy(&attr_name[XATTR_USER_PREFIX_LEN], eabuf->name,
2375 		       eabuf->EaNameLength);
2376 		attr_name[XATTR_USER_PREFIX_LEN + eabuf->EaNameLength] = '\0';
2377 		value = (char *)&eabuf->name + eabuf->EaNameLength + 1;
2378 
2379 		if (!eabuf->EaValueLength) {
2380 			rc = ksmbd_vfs_casexattr_len(idmap,
2381 						     path->dentry,
2382 						     attr_name,
2383 						     XATTR_USER_PREFIX_LEN +
2384 						     eabuf->EaNameLength);
2385 
2386 			/* delete the EA only when it exits */
2387 			if (rc > 0) {
2388 				rc = ksmbd_vfs_remove_xattr(idmap,
2389 							    path,
2390 							    attr_name,
2391 							    get_write);
2392 
2393 				if (rc < 0) {
2394 					ksmbd_debug(SMB,
2395 						    "remove xattr failed(%d)\n",
2396 						    rc);
2397 					break;
2398 				}
2399 			}
2400 
2401 			/* if the EA doesn't exist, just do nothing. */
2402 			rc = 0;
2403 		} else {
2404 			rc = ksmbd_vfs_setxattr(idmap, path, attr_name, value,
2405 						le16_to_cpu(eabuf->EaValueLength),
2406 						0, get_write);
2407 			if (rc < 0) {
2408 				ksmbd_debug(SMB,
2409 					    "ksmbd_vfs_setxattr is failed(%d)\n",
2410 					    rc);
2411 				break;
2412 			}
2413 		}
2414 
2415 next:
2416 		next = le32_to_cpu(eabuf->NextEntryOffset);
2417 		if (next == 0 || buf_len < next)
2418 			break;
2419 		buf_len -= next;
2420 		eabuf = (struct smb2_ea_info *)((char *)eabuf + next);
2421 		if (buf_len < sizeof(struct smb2_ea_info)) {
2422 			rc = -EINVAL;
2423 			break;
2424 		}
2425 
2426 		if (buf_len < sizeof(struct smb2_ea_info) + eabuf->EaNameLength +
2427 				le16_to_cpu(eabuf->EaValueLength)) {
2428 			rc = -EINVAL;
2429 			break;
2430 		}
2431 	} while (next != 0);
2432 
2433 	kfree(attr_name);
2434 	return rc;
2435 }
2436 
smb2_set_stream_name_xattr(const struct path * path,struct ksmbd_file * fp,char * stream_name,int s_type)2437 static noinline int smb2_set_stream_name_xattr(const struct path *path,
2438 					       struct ksmbd_file *fp,
2439 					       char *stream_name, int s_type)
2440 {
2441 	struct mnt_idmap *idmap = mnt_idmap(path->mnt);
2442 	size_t xattr_stream_size;
2443 	char *xattr_stream_name;
2444 	int rc;
2445 
2446 	rc = ksmbd_vfs_xattr_stream_name(stream_name,
2447 					 &xattr_stream_name,
2448 					 &xattr_stream_size,
2449 					 s_type);
2450 	if (rc)
2451 		return rc;
2452 
2453 	fp->stream.name = xattr_stream_name;
2454 	fp->stream.size = xattr_stream_size;
2455 
2456 	/* Check if there is stream prefix in xattr space */
2457 	rc = ksmbd_vfs_casexattr_len(idmap,
2458 				     path->dentry,
2459 				     xattr_stream_name,
2460 				     xattr_stream_size);
2461 	if (rc >= 0)
2462 		return 0;
2463 
2464 	if (fp->cdoption == FILE_OPEN_LE) {
2465 		ksmbd_debug(SMB, "XATTR stream name lookup failed: %d\n", rc);
2466 		return -EBADF;
2467 	}
2468 
2469 	rc = ksmbd_vfs_setxattr(idmap, path, xattr_stream_name, NULL, 0, 0, false);
2470 	if (rc < 0)
2471 		pr_err("Failed to store XATTR stream name :%d\n", rc);
2472 	return 0;
2473 }
2474 
smb2_remove_smb_xattrs(const struct path * path)2475 static int smb2_remove_smb_xattrs(const struct path *path)
2476 {
2477 	struct mnt_idmap *idmap = mnt_idmap(path->mnt);
2478 	char *name, *xattr_list = NULL;
2479 	ssize_t xattr_list_len;
2480 	int err = 0;
2481 
2482 	xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
2483 	if (xattr_list_len < 0) {
2484 		goto out;
2485 	} else if (!xattr_list_len) {
2486 		ksmbd_debug(SMB, "empty xattr in the file\n");
2487 		goto out;
2488 	}
2489 
2490 	for (name = xattr_list; name - xattr_list < xattr_list_len;
2491 			name += strlen(name) + 1) {
2492 		ksmbd_debug(SMB, "%s, len %zd\n", name, strlen(name));
2493 
2494 		if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN) &&
2495 		    !strncmp(&name[XATTR_USER_PREFIX_LEN], STREAM_PREFIX,
2496 			     STREAM_PREFIX_LEN)) {
2497 			err = ksmbd_vfs_remove_xattr(idmap, path,
2498 						     name, true);
2499 			if (err)
2500 				ksmbd_debug(SMB, "remove xattr failed : %s\n",
2501 					    name);
2502 		}
2503 	}
2504 out:
2505 	kvfree(xattr_list);
2506 	return err;
2507 }
2508 
smb2_create_truncate(const struct path * path)2509 static int smb2_create_truncate(const struct path *path)
2510 {
2511 	int rc = vfs_truncate(path, 0);
2512 
2513 	if (rc) {
2514 		pr_err("vfs_truncate failed, rc %d\n", rc);
2515 		return rc;
2516 	}
2517 
2518 	rc = smb2_remove_smb_xattrs(path);
2519 	if (rc == -EOPNOTSUPP)
2520 		rc = 0;
2521 	if (rc)
2522 		ksmbd_debug(SMB,
2523 			    "ksmbd_truncate_stream_name_xattr failed, rc %d\n",
2524 			    rc);
2525 	return rc;
2526 }
2527 
smb2_new_xattrs(struct ksmbd_tree_connect * tcon,const struct path * path,struct ksmbd_file * fp)2528 static void smb2_new_xattrs(struct ksmbd_tree_connect *tcon, const struct path *path,
2529 			    struct ksmbd_file *fp)
2530 {
2531 	struct xattr_dos_attrib da = {0};
2532 	int rc;
2533 
2534 	if (!test_share_config_flag(tcon->share_conf,
2535 				    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS))
2536 		return;
2537 
2538 	da.version = 4;
2539 	da.attr = le32_to_cpu(fp->f_ci->m_fattr);
2540 	da.itime = da.create_time = fp->create_time;
2541 	da.flags = XATTR_DOSINFO_ATTRIB | XATTR_DOSINFO_CREATE_TIME |
2542 		XATTR_DOSINFO_ITIME;
2543 
2544 	rc = ksmbd_vfs_set_dos_attrib_xattr(mnt_idmap(path->mnt), path, &da, true);
2545 	if (rc)
2546 		ksmbd_debug(SMB, "failed to store file attribute into xattr\n");
2547 }
2548 
smb2_update_xattrs(struct ksmbd_tree_connect * tcon,const struct path * path,struct ksmbd_file * fp)2549 static void smb2_update_xattrs(struct ksmbd_tree_connect *tcon,
2550 			       const struct path *path, struct ksmbd_file *fp)
2551 {
2552 	struct xattr_dos_attrib da;
2553 	int rc;
2554 
2555 	fp->f_ci->m_fattr &= ~(FILE_ATTRIBUTE_HIDDEN_LE | FILE_ATTRIBUTE_SYSTEM_LE);
2556 
2557 	/* get FileAttributes from XATTR_NAME_DOS_ATTRIBUTE */
2558 	if (!test_share_config_flag(tcon->share_conf,
2559 				    KSMBD_SHARE_FLAG_STORE_DOS_ATTRS))
2560 		return;
2561 
2562 	rc = ksmbd_vfs_get_dos_attrib_xattr(mnt_idmap(path->mnt),
2563 					    path->dentry, &da);
2564 	if (rc > 0) {
2565 		fp->f_ci->m_fattr = cpu_to_le32(da.attr);
2566 		fp->create_time = da.create_time;
2567 		fp->itime = da.itime;
2568 	}
2569 }
2570 
smb2_creat(struct ksmbd_work * work,struct path * parent_path,struct path * path,char * name,int open_flags,umode_t posix_mode,bool is_dir)2571 static int smb2_creat(struct ksmbd_work *work, struct path *parent_path,
2572 		      struct path *path, char *name, int open_flags,
2573 		      umode_t posix_mode, bool is_dir)
2574 {
2575 	struct ksmbd_tree_connect *tcon = work->tcon;
2576 	struct ksmbd_share_config *share = tcon->share_conf;
2577 	umode_t mode;
2578 	int rc;
2579 
2580 	if (!(open_flags & O_CREAT))
2581 		return -EBADF;
2582 
2583 	ksmbd_debug(SMB, "file does not exist, so creating\n");
2584 	if (is_dir == true) {
2585 		ksmbd_debug(SMB, "creating directory\n");
2586 
2587 		mode = share_config_directory_mode(share, posix_mode);
2588 		rc = ksmbd_vfs_mkdir(work, name, mode);
2589 		if (rc)
2590 			return rc;
2591 	} else {
2592 		ksmbd_debug(SMB, "creating regular file\n");
2593 
2594 		mode = share_config_create_mode(share, posix_mode);
2595 		rc = ksmbd_vfs_create(work, name, mode);
2596 		if (rc)
2597 			return rc;
2598 	}
2599 
2600 	rc = ksmbd_vfs_kern_path_locked(work, name, 0, parent_path, path, 0);
2601 	if (rc) {
2602 		pr_err("cannot get linux path (%s), err = %d\n",
2603 		       name, rc);
2604 		return rc;
2605 	}
2606 	return 0;
2607 }
2608 
smb2_create_sd_buffer(struct ksmbd_work * work,struct smb2_create_req * req,const struct path * path)2609 static int smb2_create_sd_buffer(struct ksmbd_work *work,
2610 				 struct smb2_create_req *req,
2611 				 const struct path *path)
2612 {
2613 	struct create_context *context;
2614 	struct create_sd_buf_req *sd_buf;
2615 
2616 	if (!req->CreateContextsOffset)
2617 		return -ENOENT;
2618 
2619 	/* Parse SD BUFFER create contexts */
2620 	context = smb2_find_context_vals(req, SMB2_CREATE_SD_BUFFER, 4);
2621 	if (!context)
2622 		return -ENOENT;
2623 	else if (IS_ERR(context))
2624 		return PTR_ERR(context);
2625 
2626 	ksmbd_debug(SMB,
2627 		    "Set ACLs using SMB2_CREATE_SD_BUFFER context\n");
2628 	sd_buf = (struct create_sd_buf_req *)context;
2629 	if (le16_to_cpu(context->DataOffset) +
2630 	    le32_to_cpu(context->DataLength) <
2631 	    sizeof(struct create_sd_buf_req))
2632 		return -EINVAL;
2633 	return set_info_sec(work->conn, work->tcon, path, &sd_buf->ntsd,
2634 			    le32_to_cpu(sd_buf->ccontext.DataLength), true, false);
2635 }
2636 
ksmbd_acls_fattr(struct smb_fattr * fattr,struct mnt_idmap * idmap,struct inode * inode)2637 static void ksmbd_acls_fattr(struct smb_fattr *fattr,
2638 			     struct mnt_idmap *idmap,
2639 			     struct inode *inode)
2640 {
2641 	vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
2642 	vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
2643 
2644 	fattr->cf_uid = vfsuid_into_kuid(vfsuid);
2645 	fattr->cf_gid = vfsgid_into_kgid(vfsgid);
2646 	fattr->cf_mode = inode->i_mode;
2647 	fattr->cf_acls = NULL;
2648 	fattr->cf_dacls = NULL;
2649 
2650 	if (IS_ENABLED(CONFIG_FS_POSIX_ACL)) {
2651 		fattr->cf_acls = get_inode_acl(inode, ACL_TYPE_ACCESS);
2652 		if (S_ISDIR(inode->i_mode))
2653 			fattr->cf_dacls = get_inode_acl(inode, ACL_TYPE_DEFAULT);
2654 	}
2655 }
2656 
2657 enum {
2658 	DURABLE_RECONN_V2 = 1,
2659 	DURABLE_RECONN,
2660 	DURABLE_REQ_V2,
2661 	DURABLE_REQ,
2662 };
2663 
2664 struct durable_info {
2665 	struct ksmbd_file *fp;
2666 	unsigned short int type;
2667 	bool persistent;
2668 	bool reconnected;
2669 	unsigned int timeout;
2670 	char *CreateGuid;
2671 };
2672 
parse_durable_handle_context(struct ksmbd_work * work,struct smb2_create_req * req,struct lease_ctx_info * lc,struct durable_info * dh_info)2673 static int parse_durable_handle_context(struct ksmbd_work *work,
2674 					struct smb2_create_req *req,
2675 					struct lease_ctx_info *lc,
2676 					struct durable_info *dh_info)
2677 {
2678 	struct ksmbd_conn *conn = work->conn;
2679 	struct create_context *context;
2680 	int dh_idx, err = 0;
2681 	u64 persistent_id = 0;
2682 	int req_op_level;
2683 	static const char * const durable_arr[] = {"DH2C", "DHnC", "DH2Q", "DHnQ"};
2684 
2685 	req_op_level = req->RequestedOplockLevel;
2686 	for (dh_idx = DURABLE_RECONN_V2; dh_idx <= ARRAY_SIZE(durable_arr);
2687 	     dh_idx++) {
2688 		context = smb2_find_context_vals(req, durable_arr[dh_idx - 1], 4);
2689 		if (IS_ERR(context)) {
2690 			err = PTR_ERR(context);
2691 			goto out;
2692 		}
2693 		if (!context)
2694 			continue;
2695 
2696 		switch (dh_idx) {
2697 		case DURABLE_RECONN_V2:
2698 		{
2699 			struct create_durable_reconn_v2_req *recon_v2;
2700 
2701 			if (dh_info->type == DURABLE_RECONN ||
2702 			    dh_info->type == DURABLE_REQ_V2) {
2703 				err = -EINVAL;
2704 				goto out;
2705 			}
2706 
2707 			recon_v2 = (struct create_durable_reconn_v2_req *)context;
2708 			persistent_id = recon_v2->Fid.PersistentFileId;
2709 			dh_info->fp = ksmbd_lookup_durable_fd(persistent_id);
2710 			if (!dh_info->fp) {
2711 				ksmbd_debug(SMB, "Failed to get durable handle state\n");
2712 				err = -EBADF;
2713 				goto out;
2714 			}
2715 
2716 			if (memcmp(dh_info->fp->create_guid, recon_v2->CreateGuid,
2717 				   SMB2_CREATE_GUID_SIZE)) {
2718 				err = -EBADF;
2719 				ksmbd_put_durable_fd(dh_info->fp);
2720 				goto out;
2721 			}
2722 
2723 			dh_info->type = dh_idx;
2724 			dh_info->reconnected = true;
2725 			ksmbd_debug(SMB,
2726 				"reconnect v2 Persistent-id from reconnect = %llu\n",
2727 					persistent_id);
2728 			break;
2729 		}
2730 		case DURABLE_RECONN:
2731 		{
2732 			struct create_durable_reconn_req *recon;
2733 
2734 			if (dh_info->type == DURABLE_RECONN_V2 ||
2735 			    dh_info->type == DURABLE_REQ_V2) {
2736 				err = -EINVAL;
2737 				goto out;
2738 			}
2739 
2740 			recon = (struct create_durable_reconn_req *)context;
2741 			persistent_id = recon->Data.Fid.PersistentFileId;
2742 			dh_info->fp = ksmbd_lookup_durable_fd(persistent_id);
2743 			if (!dh_info->fp) {
2744 				ksmbd_debug(SMB, "Failed to get durable handle state\n");
2745 				err = -EBADF;
2746 				goto out;
2747 			}
2748 
2749 			dh_info->type = dh_idx;
2750 			dh_info->reconnected = true;
2751 			ksmbd_debug(SMB, "reconnect Persistent-id from reconnect = %llu\n",
2752 				    persistent_id);
2753 			break;
2754 		}
2755 		case DURABLE_REQ_V2:
2756 		{
2757 			struct create_durable_req_v2 *durable_v2_blob;
2758 
2759 			if (dh_info->type == DURABLE_RECONN ||
2760 			    dh_info->type == DURABLE_RECONN_V2) {
2761 				err = -EINVAL;
2762 				goto out;
2763 			}
2764 
2765 			durable_v2_blob =
2766 				(struct create_durable_req_v2 *)context;
2767 			ksmbd_debug(SMB, "Request for durable v2 open\n");
2768 			dh_info->fp = ksmbd_lookup_fd_cguid(durable_v2_blob->CreateGuid);
2769 			if (dh_info->fp) {
2770 				if (!memcmp(conn->ClientGUID, dh_info->fp->client_guid,
2771 					    SMB2_CLIENT_GUID_SIZE)) {
2772 					if (!(req->hdr.Flags & SMB2_FLAGS_REPLAY_OPERATION)) {
2773 						err = -ENOEXEC;
2774 						goto out;
2775 					}
2776 
2777 					dh_info->fp->conn = conn;
2778 					dh_info->reconnected = true;
2779 					goto out;
2780 				}
2781 			}
2782 
2783 			if ((lc && (lc->req_state & SMB2_LEASE_HANDLE_CACHING_LE)) ||
2784 			    req_op_level == SMB2_OPLOCK_LEVEL_BATCH) {
2785 				dh_info->CreateGuid =
2786 					durable_v2_blob->CreateGuid;
2787 				dh_info->persistent =
2788 					le32_to_cpu(durable_v2_blob->Flags);
2789 				dh_info->timeout =
2790 					le32_to_cpu(durable_v2_blob->Timeout);
2791 				dh_info->type = dh_idx;
2792 			}
2793 			break;
2794 		}
2795 		case DURABLE_REQ:
2796 			if (dh_info->type == DURABLE_RECONN)
2797 				goto out;
2798 			if (dh_info->type == DURABLE_RECONN_V2 ||
2799 			    dh_info->type == DURABLE_REQ_V2) {
2800 				err = -EINVAL;
2801 				goto out;
2802 			}
2803 
2804 			if ((lc && (lc->req_state & SMB2_LEASE_HANDLE_CACHING_LE)) ||
2805 			    req_op_level == SMB2_OPLOCK_LEVEL_BATCH) {
2806 				ksmbd_debug(SMB, "Request for durable open\n");
2807 				dh_info->type = dh_idx;
2808 			}
2809 		}
2810 	}
2811 
2812 out:
2813 	return err;
2814 }
2815 
2816 /**
2817  * smb2_open() - handler for smb file open request
2818  * @work:	smb work containing request buffer
2819  *
2820  * Return:      0 on success, otherwise error
2821  */
smb2_open(struct ksmbd_work * work)2822 int smb2_open(struct ksmbd_work *work)
2823 {
2824 	struct ksmbd_conn *conn = work->conn;
2825 	struct ksmbd_session *sess = work->sess;
2826 	struct ksmbd_tree_connect *tcon = work->tcon;
2827 	struct smb2_create_req *req;
2828 	struct smb2_create_rsp *rsp;
2829 	struct path path, parent_path;
2830 	struct ksmbd_share_config *share = tcon->share_conf;
2831 	struct ksmbd_file *fp = NULL;
2832 	struct file *filp = NULL;
2833 	struct mnt_idmap *idmap = NULL;
2834 	struct kstat stat;
2835 	struct create_context *context;
2836 	struct lease_ctx_info *lc = NULL;
2837 	struct create_ea_buf_req *ea_buf = NULL;
2838 	struct oplock_info *opinfo;
2839 	struct durable_info dh_info = {0};
2840 	__le32 *next_ptr = NULL;
2841 	int req_op_level = 0, open_flags = 0, may_flags = 0, file_info = 0;
2842 	int rc = 0;
2843 	int contxt_cnt = 0, query_disk_id = 0;
2844 	int maximal_access_ctxt = 0, posix_ctxt = 0;
2845 	int s_type = 0;
2846 	int next_off = 0;
2847 	char *name = NULL;
2848 	char *stream_name = NULL;
2849 	bool file_present = false, created = false, already_permitted = false;
2850 	int share_ret, need_truncate = 0;
2851 	u64 time;
2852 	umode_t posix_mode = 0;
2853 	__le32 daccess, maximal_access = 0;
2854 	int iov_len = 0;
2855 
2856 	ksmbd_debug(SMB, "Received smb2 create request\n");
2857 
2858 	WORK_BUFFERS(work, req, rsp);
2859 
2860 	if (req->hdr.NextCommand && !work->next_smb2_rcv_hdr_off &&
2861 	    (req->hdr.Flags & SMB2_FLAGS_RELATED_OPERATIONS)) {
2862 		ksmbd_debug(SMB, "invalid flag in chained command\n");
2863 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
2864 		smb2_set_err_rsp(work);
2865 		return -EINVAL;
2866 	}
2867 
2868 	if (test_share_config_flag(share, KSMBD_SHARE_FLAG_PIPE)) {
2869 		ksmbd_debug(SMB, "IPC pipe create request\n");
2870 		return create_smb2_pipe(work);
2871 	}
2872 
2873 	if (req->NameLength) {
2874 		name = smb2_get_name((char *)req + le16_to_cpu(req->NameOffset),
2875 				     le16_to_cpu(req->NameLength),
2876 				     work->conn->local_nls);
2877 		if (IS_ERR(name)) {
2878 			rc = PTR_ERR(name);
2879 			name = NULL;
2880 			goto err_out2;
2881 		}
2882 
2883 		ksmbd_debug(SMB, "converted name = %s\n", name);
2884 		if (strchr(name, ':')) {
2885 			if (!test_share_config_flag(work->tcon->share_conf,
2886 						    KSMBD_SHARE_FLAG_STREAMS)) {
2887 				rc = -EBADF;
2888 				goto err_out2;
2889 			}
2890 			rc = parse_stream_name(name, &stream_name, &s_type);
2891 			if (rc < 0)
2892 				goto err_out2;
2893 		}
2894 
2895 		rc = ksmbd_validate_filename(name);
2896 		if (rc < 0)
2897 			goto err_out2;
2898 
2899 		if (ksmbd_share_veto_filename(share, name)) {
2900 			rc = -ENOENT;
2901 			ksmbd_debug(SMB, "Reject open(), vetoed file: %s\n",
2902 				    name);
2903 			goto err_out2;
2904 		}
2905 	} else {
2906 		name = kstrdup("", KSMBD_DEFAULT_GFP);
2907 		if (!name) {
2908 			rc = -ENOMEM;
2909 			goto err_out2;
2910 		}
2911 	}
2912 
2913 	req_op_level = req->RequestedOplockLevel;
2914 
2915 	if (server_conf.flags & KSMBD_GLOBAL_FLAG_DURABLE_HANDLE &&
2916 	    req->CreateContextsOffset) {
2917 		lc = parse_lease_state(req);
2918 		rc = parse_durable_handle_context(work, req, lc, &dh_info);
2919 		if (rc) {
2920 			ksmbd_debug(SMB, "error parsing durable handle context\n");
2921 			goto err_out2;
2922 		}
2923 
2924 		if (dh_info.reconnected == true) {
2925 			rc = smb2_check_durable_oplock(conn, share, dh_info.fp, lc, name);
2926 			if (rc) {
2927 				ksmbd_put_durable_fd(dh_info.fp);
2928 				goto err_out2;
2929 			}
2930 
2931 			rc = ksmbd_reopen_durable_fd(work, dh_info.fp);
2932 			if (rc) {
2933 				ksmbd_put_durable_fd(dh_info.fp);
2934 				goto err_out2;
2935 			}
2936 
2937 			if (ksmbd_override_fsids(work)) {
2938 				rc = -ENOMEM;
2939 				ksmbd_put_durable_fd(dh_info.fp);
2940 				goto err_out2;
2941 			}
2942 
2943 			fp = dh_info.fp;
2944 			file_info = FILE_OPENED;
2945 
2946 			rc = ksmbd_vfs_getattr(&fp->filp->f_path, &stat);
2947 			if (rc)
2948 				goto err_out2;
2949 
2950 			ksmbd_put_durable_fd(fp);
2951 			goto reconnected_fp;
2952 		}
2953 	} else if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE)
2954 		lc = parse_lease_state(req);
2955 
2956 	if (le32_to_cpu(req->ImpersonationLevel) > le32_to_cpu(IL_DELEGATE)) {
2957 		pr_err("Invalid impersonationlevel : 0x%x\n",
2958 		       le32_to_cpu(req->ImpersonationLevel));
2959 		rc = -EIO;
2960 		rsp->hdr.Status = STATUS_BAD_IMPERSONATION_LEVEL;
2961 		goto err_out2;
2962 	}
2963 
2964 	if (req->CreateOptions && !(req->CreateOptions & CREATE_OPTIONS_MASK_LE)) {
2965 		pr_err("Invalid create options : 0x%x\n",
2966 		       le32_to_cpu(req->CreateOptions));
2967 		rc = -EINVAL;
2968 		goto err_out2;
2969 	} else {
2970 		if (req->CreateOptions & FILE_SEQUENTIAL_ONLY_LE &&
2971 		    req->CreateOptions & FILE_RANDOM_ACCESS_LE)
2972 			req->CreateOptions = ~(FILE_SEQUENTIAL_ONLY_LE);
2973 
2974 		if (req->CreateOptions &
2975 		    (FILE_OPEN_BY_FILE_ID_LE | CREATE_TREE_CONNECTION |
2976 		     FILE_RESERVE_OPFILTER_LE)) {
2977 			rc = -EOPNOTSUPP;
2978 			goto err_out2;
2979 		}
2980 
2981 		if (req->CreateOptions & FILE_DIRECTORY_FILE_LE) {
2982 			if (req->CreateOptions & FILE_NON_DIRECTORY_FILE_LE) {
2983 				rc = -EINVAL;
2984 				goto err_out2;
2985 			} else if (req->CreateOptions & FILE_NO_COMPRESSION_LE) {
2986 				req->CreateOptions = ~(FILE_NO_COMPRESSION_LE);
2987 			}
2988 		}
2989 	}
2990 
2991 	if (le32_to_cpu(req->CreateDisposition) >
2992 	    le32_to_cpu(FILE_OVERWRITE_IF_LE)) {
2993 		pr_err("Invalid create disposition : 0x%x\n",
2994 		       le32_to_cpu(req->CreateDisposition));
2995 		rc = -EINVAL;
2996 		goto err_out2;
2997 	}
2998 
2999 	if (!(req->DesiredAccess & DESIRED_ACCESS_MASK)) {
3000 		pr_err("Invalid desired access : 0x%x\n",
3001 		       le32_to_cpu(req->DesiredAccess));
3002 		rc = -EACCES;
3003 		goto err_out2;
3004 	}
3005 
3006 	if (req->FileAttributes && !(req->FileAttributes & FILE_ATTRIBUTE_MASK_LE)) {
3007 		pr_err("Invalid file attribute : 0x%x\n",
3008 		       le32_to_cpu(req->FileAttributes));
3009 		rc = -EINVAL;
3010 		goto err_out2;
3011 	}
3012 
3013 	if (req->CreateContextsOffset) {
3014 		/* Parse non-durable handle create contexts */
3015 		context = smb2_find_context_vals(req, SMB2_CREATE_EA_BUFFER, 4);
3016 		if (IS_ERR(context)) {
3017 			rc = PTR_ERR(context);
3018 			goto err_out2;
3019 		} else if (context) {
3020 			ea_buf = (struct create_ea_buf_req *)context;
3021 			if (le16_to_cpu(context->DataOffset) +
3022 			    le32_to_cpu(context->DataLength) <
3023 			    sizeof(struct create_ea_buf_req)) {
3024 				rc = -EINVAL;
3025 				goto err_out2;
3026 			}
3027 			if (req->CreateOptions & FILE_NO_EA_KNOWLEDGE_LE) {
3028 				rsp->hdr.Status = STATUS_ACCESS_DENIED;
3029 				rc = -EACCES;
3030 				goto err_out2;
3031 			}
3032 		}
3033 
3034 		context = smb2_find_context_vals(req,
3035 						 SMB2_CREATE_QUERY_MAXIMAL_ACCESS_REQUEST, 4);
3036 		if (IS_ERR(context)) {
3037 			rc = PTR_ERR(context);
3038 			goto err_out2;
3039 		} else if (context) {
3040 			ksmbd_debug(SMB,
3041 				    "get query maximal access context\n");
3042 			maximal_access_ctxt = 1;
3043 		}
3044 
3045 		context = smb2_find_context_vals(req,
3046 						 SMB2_CREATE_TIMEWARP_REQUEST, 4);
3047 		if (IS_ERR(context)) {
3048 			rc = PTR_ERR(context);
3049 			goto err_out2;
3050 		} else if (context) {
3051 			ksmbd_debug(SMB, "get timewarp context\n");
3052 			rc = -EBADF;
3053 			goto err_out2;
3054 		}
3055 
3056 		if (tcon->posix_extensions) {
3057 			context = smb2_find_context_vals(req,
3058 							 SMB2_CREATE_TAG_POSIX, 16);
3059 			if (IS_ERR(context)) {
3060 				rc = PTR_ERR(context);
3061 				goto err_out2;
3062 			} else if (context) {
3063 				struct create_posix *posix =
3064 					(struct create_posix *)context;
3065 				if (le16_to_cpu(context->DataOffset) +
3066 				    le32_to_cpu(context->DataLength) <
3067 				    sizeof(struct create_posix) - 4) {
3068 					rc = -EINVAL;
3069 					goto err_out2;
3070 				}
3071 				ksmbd_debug(SMB, "get posix context\n");
3072 
3073 				posix_mode = le32_to_cpu(posix->Mode);
3074 				posix_ctxt = 1;
3075 			}
3076 		}
3077 	}
3078 
3079 	if (ksmbd_override_fsids(work)) {
3080 		rc = -ENOMEM;
3081 		goto err_out2;
3082 	}
3083 
3084 	rc = ksmbd_vfs_kern_path_locked(work, name, LOOKUP_NO_SYMLINKS,
3085 					&parent_path, &path, 1);
3086 	if (!rc) {
3087 		file_present = true;
3088 
3089 		if (req->CreateOptions & FILE_DELETE_ON_CLOSE_LE) {
3090 			/*
3091 			 * If file exists with under flags, return access
3092 			 * denied error.
3093 			 */
3094 			if (req->CreateDisposition == FILE_OVERWRITE_IF_LE ||
3095 			    req->CreateDisposition == FILE_OPEN_IF_LE) {
3096 				rc = -EACCES;
3097 				goto err_out;
3098 			}
3099 
3100 			if (!test_tree_conn_flag(tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
3101 				ksmbd_debug(SMB,
3102 					    "User does not have write permission\n");
3103 				rc = -EACCES;
3104 				goto err_out;
3105 			}
3106 		} else if (d_is_symlink(path.dentry)) {
3107 			rc = -EACCES;
3108 			goto err_out;
3109 		}
3110 
3111 		idmap = mnt_idmap(path.mnt);
3112 	} else {
3113 		if (rc != -ENOENT)
3114 			goto err_out;
3115 		ksmbd_debug(SMB, "can not get linux path for %s, rc = %d\n",
3116 			    name, rc);
3117 		rc = 0;
3118 	}
3119 
3120 	if (stream_name) {
3121 		if (req->CreateOptions & FILE_DIRECTORY_FILE_LE) {
3122 			if (s_type == DATA_STREAM) {
3123 				rc = -EIO;
3124 				rsp->hdr.Status = STATUS_NOT_A_DIRECTORY;
3125 			}
3126 		} else {
3127 			if (file_present && S_ISDIR(d_inode(path.dentry)->i_mode) &&
3128 			    s_type == DATA_STREAM) {
3129 				rc = -EIO;
3130 				rsp->hdr.Status = STATUS_FILE_IS_A_DIRECTORY;
3131 			}
3132 		}
3133 
3134 		if (req->CreateOptions & FILE_DIRECTORY_FILE_LE &&
3135 		    req->FileAttributes & FILE_ATTRIBUTE_NORMAL_LE) {
3136 			rsp->hdr.Status = STATUS_NOT_A_DIRECTORY;
3137 			rc = -EIO;
3138 		}
3139 
3140 		if (rc < 0)
3141 			goto err_out;
3142 	}
3143 
3144 	if (file_present && req->CreateOptions & FILE_NON_DIRECTORY_FILE_LE &&
3145 	    S_ISDIR(d_inode(path.dentry)->i_mode) &&
3146 	    !(req->CreateOptions & FILE_DELETE_ON_CLOSE_LE)) {
3147 		ksmbd_debug(SMB, "open() argument is a directory: %s, %x\n",
3148 			    name, req->CreateOptions);
3149 		rsp->hdr.Status = STATUS_FILE_IS_A_DIRECTORY;
3150 		rc = -EIO;
3151 		goto err_out;
3152 	}
3153 
3154 	if (file_present && (req->CreateOptions & FILE_DIRECTORY_FILE_LE) &&
3155 	    !(req->CreateDisposition == FILE_CREATE_LE) &&
3156 	    !S_ISDIR(d_inode(path.dentry)->i_mode)) {
3157 		rsp->hdr.Status = STATUS_NOT_A_DIRECTORY;
3158 		rc = -EIO;
3159 		goto err_out;
3160 	}
3161 
3162 	if (!stream_name && file_present &&
3163 	    req->CreateDisposition == FILE_CREATE_LE) {
3164 		rc = -EEXIST;
3165 		goto err_out;
3166 	}
3167 
3168 	daccess = smb_map_generic_desired_access(req->DesiredAccess);
3169 
3170 	if (file_present && !(req->CreateOptions & FILE_DELETE_ON_CLOSE_LE)) {
3171 		rc = smb_check_perm_dacl(conn, &path, &daccess,
3172 					 sess->user->uid);
3173 		if (rc)
3174 			goto err_out;
3175 	}
3176 
3177 	if (daccess & FILE_MAXIMAL_ACCESS_LE) {
3178 		if (!file_present) {
3179 			daccess = cpu_to_le32(GENERIC_ALL_FLAGS);
3180 		} else {
3181 			ksmbd_vfs_query_maximal_access(idmap,
3182 							    path.dentry,
3183 							    &daccess);
3184 			already_permitted = true;
3185 		}
3186 		maximal_access = daccess;
3187 	}
3188 
3189 	open_flags = smb2_create_open_flags(file_present, daccess,
3190 					    req->CreateDisposition,
3191 					    &may_flags,
3192 					    req->CreateOptions,
3193 					    file_present ? d_inode(path.dentry)->i_mode : 0);
3194 
3195 	if (!test_tree_conn_flag(tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
3196 		if (open_flags & (O_CREAT | O_TRUNC)) {
3197 			ksmbd_debug(SMB,
3198 				    "User does not have write permission\n");
3199 			rc = -EACCES;
3200 			goto err_out;
3201 		}
3202 	}
3203 
3204 	/*create file if not present */
3205 	if (!file_present) {
3206 		rc = smb2_creat(work, &parent_path, &path, name, open_flags,
3207 				posix_mode,
3208 				req->CreateOptions & FILE_DIRECTORY_FILE_LE);
3209 		if (rc) {
3210 			if (rc == -ENOENT) {
3211 				rc = -EIO;
3212 				rsp->hdr.Status = STATUS_OBJECT_PATH_NOT_FOUND;
3213 			}
3214 			goto err_out;
3215 		}
3216 
3217 		created = true;
3218 		idmap = mnt_idmap(path.mnt);
3219 		if (ea_buf) {
3220 			if (le32_to_cpu(ea_buf->ccontext.DataLength) <
3221 			    sizeof(struct smb2_ea_info)) {
3222 				rc = -EINVAL;
3223 				goto err_out;
3224 			}
3225 
3226 			rc = smb2_set_ea(&ea_buf->ea,
3227 					 le32_to_cpu(ea_buf->ccontext.DataLength),
3228 					 &path, false);
3229 			if (rc == -EOPNOTSUPP)
3230 				rc = 0;
3231 			else if (rc)
3232 				goto err_out;
3233 		}
3234 	} else if (!already_permitted) {
3235 		/* FILE_READ_ATTRIBUTE is allowed without inode_permission,
3236 		 * because execute(search) permission on a parent directory,
3237 		 * is already granted.
3238 		 */
3239 		if (daccess & ~(FILE_READ_ATTRIBUTES_LE | FILE_READ_CONTROL_LE)) {
3240 			rc = inode_permission(idmap,
3241 					      d_inode(path.dentry),
3242 					      may_flags);
3243 			if (rc)
3244 				goto err_out;
3245 
3246 			if ((daccess & FILE_DELETE_LE) ||
3247 			    (req->CreateOptions & FILE_DELETE_ON_CLOSE_LE)) {
3248 				rc = inode_permission(idmap,
3249 						      d_inode(path.dentry->d_parent),
3250 						      MAY_EXEC | MAY_WRITE);
3251 				if (rc)
3252 					goto err_out;
3253 			}
3254 		}
3255 	}
3256 
3257 	rc = ksmbd_query_inode_status(path.dentry->d_parent);
3258 	if (rc == KSMBD_INODE_STATUS_PENDING_DELETE) {
3259 		rc = -EBUSY;
3260 		goto err_out;
3261 	}
3262 
3263 	rc = 0;
3264 	filp = dentry_open(&path, open_flags, current_cred());
3265 	if (IS_ERR(filp)) {
3266 		rc = PTR_ERR(filp);
3267 		pr_err("dentry open for dir failed, rc %d\n", rc);
3268 		goto err_out;
3269 	}
3270 
3271 	if (file_present) {
3272 		if (!(open_flags & O_TRUNC))
3273 			file_info = FILE_OPENED;
3274 		else
3275 			file_info = FILE_OVERWRITTEN;
3276 
3277 		if ((req->CreateDisposition & FILE_CREATE_MASK_LE) ==
3278 		    FILE_SUPERSEDE_LE)
3279 			file_info = FILE_SUPERSEDED;
3280 	} else if (open_flags & O_CREAT) {
3281 		file_info = FILE_CREATED;
3282 	}
3283 
3284 	ksmbd_vfs_set_fadvise(filp, req->CreateOptions);
3285 
3286 	/* Obtain Volatile-ID */
3287 	fp = ksmbd_open_fd(work, filp);
3288 	if (IS_ERR(fp)) {
3289 		fput(filp);
3290 		rc = PTR_ERR(fp);
3291 		fp = NULL;
3292 		goto err_out;
3293 	}
3294 
3295 	/* Get Persistent-ID */
3296 	ksmbd_open_durable_fd(fp);
3297 	if (!has_file_id(fp->persistent_id)) {
3298 		rc = -ENOMEM;
3299 		goto err_out;
3300 	}
3301 
3302 	fp->cdoption = req->CreateDisposition;
3303 	fp->daccess = daccess;
3304 	fp->saccess = req->ShareAccess;
3305 	fp->coption = req->CreateOptions;
3306 
3307 	/* Set default windows and posix acls if creating new file */
3308 	if (created) {
3309 		int posix_acl_rc;
3310 		struct inode *inode = d_inode(path.dentry);
3311 
3312 		posix_acl_rc = ksmbd_vfs_inherit_posix_acl(idmap,
3313 							   &path,
3314 							   d_inode(path.dentry->d_parent));
3315 		if (posix_acl_rc)
3316 			ksmbd_debug(SMB, "inherit posix acl failed : %d\n", posix_acl_rc);
3317 
3318 		if (test_share_config_flag(work->tcon->share_conf,
3319 					   KSMBD_SHARE_FLAG_ACL_XATTR)) {
3320 			rc = smb_inherit_dacl(conn, &path, sess->user->uid,
3321 					      sess->user->gid);
3322 		}
3323 
3324 		if (rc) {
3325 			rc = smb2_create_sd_buffer(work, req, &path);
3326 			if (rc) {
3327 				if (posix_acl_rc)
3328 					ksmbd_vfs_set_init_posix_acl(idmap,
3329 								     &path);
3330 
3331 				if (test_share_config_flag(work->tcon->share_conf,
3332 							   KSMBD_SHARE_FLAG_ACL_XATTR)) {
3333 					struct smb_fattr fattr;
3334 					struct smb_ntsd *pntsd;
3335 					int pntsd_size, ace_num = 0;
3336 
3337 					ksmbd_acls_fattr(&fattr, idmap, inode);
3338 					if (fattr.cf_acls)
3339 						ace_num = fattr.cf_acls->a_count;
3340 					if (fattr.cf_dacls)
3341 						ace_num += fattr.cf_dacls->a_count;
3342 
3343 					pntsd = kmalloc(sizeof(struct smb_ntsd) +
3344 							sizeof(struct smb_sid) * 3 +
3345 							sizeof(struct smb_acl) +
3346 							sizeof(struct smb_ace) * ace_num * 2,
3347 							KSMBD_DEFAULT_GFP);
3348 					if (!pntsd) {
3349 						posix_acl_release(fattr.cf_acls);
3350 						posix_acl_release(fattr.cf_dacls);
3351 						goto err_out;
3352 					}
3353 
3354 					rc = build_sec_desc(idmap,
3355 							    pntsd, NULL, 0,
3356 							    OWNER_SECINFO |
3357 							    GROUP_SECINFO |
3358 							    DACL_SECINFO,
3359 							    &pntsd_size, &fattr);
3360 					posix_acl_release(fattr.cf_acls);
3361 					posix_acl_release(fattr.cf_dacls);
3362 					if (rc) {
3363 						kfree(pntsd);
3364 						goto err_out;
3365 					}
3366 
3367 					rc = ksmbd_vfs_set_sd_xattr(conn,
3368 								    idmap,
3369 								    &path,
3370 								    pntsd,
3371 								    pntsd_size,
3372 								    false);
3373 					kfree(pntsd);
3374 					if (rc)
3375 						pr_err("failed to store ntacl in xattr : %d\n",
3376 						       rc);
3377 				}
3378 			}
3379 		}
3380 		rc = 0;
3381 	}
3382 
3383 	if (stream_name) {
3384 		rc = smb2_set_stream_name_xattr(&path,
3385 						fp,
3386 						stream_name,
3387 						s_type);
3388 		if (rc)
3389 			goto err_out;
3390 		file_info = FILE_CREATED;
3391 	}
3392 
3393 	fp->attrib_only = !(req->DesiredAccess & ~(FILE_READ_ATTRIBUTES_LE |
3394 			FILE_WRITE_ATTRIBUTES_LE | FILE_SYNCHRONIZE_LE));
3395 
3396 	/* fp should be searchable through ksmbd_inode.m_fp_list
3397 	 * after daccess, saccess, attrib_only, and stream are
3398 	 * initialized.
3399 	 */
3400 	down_write(&fp->f_ci->m_lock);
3401 	list_add(&fp->node, &fp->f_ci->m_fp_list);
3402 	up_write(&fp->f_ci->m_lock);
3403 
3404 	/* Check delete pending among previous fp before oplock break */
3405 	if (ksmbd_inode_pending_delete(fp)) {
3406 		rc = -EBUSY;
3407 		goto err_out;
3408 	}
3409 
3410 	if (file_present || created)
3411 		ksmbd_vfs_kern_path_unlock(&parent_path, &path);
3412 
3413 	if (!S_ISDIR(file_inode(filp)->i_mode) && open_flags & O_TRUNC &&
3414 	    !fp->attrib_only && !stream_name) {
3415 		smb_break_all_oplock(work, fp);
3416 		need_truncate = 1;
3417 	}
3418 
3419 	share_ret = ksmbd_smb_check_shared_mode(fp->filp, fp);
3420 	if (!test_share_config_flag(work->tcon->share_conf, KSMBD_SHARE_FLAG_OPLOCKS) ||
3421 	    (req_op_level == SMB2_OPLOCK_LEVEL_LEASE &&
3422 	     !(conn->vals->capabilities & SMB2_GLOBAL_CAP_LEASING))) {
3423 		if (share_ret < 0 && !S_ISDIR(file_inode(fp->filp)->i_mode)) {
3424 			rc = share_ret;
3425 			goto err_out1;
3426 		}
3427 	} else {
3428 		if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE && lc) {
3429 			if (S_ISDIR(file_inode(filp)->i_mode)) {
3430 				lc->req_state &= ~SMB2_LEASE_WRITE_CACHING_LE;
3431 				lc->is_dir = true;
3432 			}
3433 
3434 			/*
3435 			 * Compare parent lease using parent key. If there is no
3436 			 * a lease that has same parent key, Send lease break
3437 			 * notification.
3438 			 */
3439 			smb_send_parent_lease_break_noti(fp, lc);
3440 
3441 			req_op_level = smb2_map_lease_to_oplock(lc->req_state);
3442 			ksmbd_debug(SMB,
3443 				    "lease req for(%s) req oplock state 0x%x, lease state 0x%x\n",
3444 				    name, req_op_level, lc->req_state);
3445 			rc = find_same_lease_key(sess, fp->f_ci, lc);
3446 			if (rc)
3447 				goto err_out1;
3448 		} else if (open_flags == O_RDONLY &&
3449 			   (req_op_level == SMB2_OPLOCK_LEVEL_BATCH ||
3450 			    req_op_level == SMB2_OPLOCK_LEVEL_EXCLUSIVE))
3451 			req_op_level = SMB2_OPLOCK_LEVEL_II;
3452 
3453 		rc = smb_grant_oplock(work, req_op_level,
3454 				      fp->persistent_id, fp,
3455 				      le32_to_cpu(req->hdr.Id.SyncId.TreeId),
3456 				      lc, share_ret);
3457 		if (rc < 0)
3458 			goto err_out1;
3459 	}
3460 
3461 	if (req->CreateOptions & FILE_DELETE_ON_CLOSE_LE)
3462 		ksmbd_fd_set_delete_on_close(fp, file_info);
3463 
3464 	if (need_truncate) {
3465 		rc = smb2_create_truncate(&fp->filp->f_path);
3466 		if (rc)
3467 			goto err_out1;
3468 	}
3469 
3470 	if (req->CreateContextsOffset) {
3471 		struct create_alloc_size_req *az_req;
3472 
3473 		az_req = (struct create_alloc_size_req *)smb2_find_context_vals(req,
3474 					SMB2_CREATE_ALLOCATION_SIZE, 4);
3475 		if (IS_ERR(az_req)) {
3476 			rc = PTR_ERR(az_req);
3477 			goto err_out1;
3478 		} else if (az_req) {
3479 			loff_t alloc_size;
3480 			int err;
3481 
3482 			if (le16_to_cpu(az_req->ccontext.DataOffset) +
3483 			    le32_to_cpu(az_req->ccontext.DataLength) <
3484 			    sizeof(struct create_alloc_size_req)) {
3485 				rc = -EINVAL;
3486 				goto err_out1;
3487 			}
3488 			alloc_size = le64_to_cpu(az_req->AllocationSize);
3489 			ksmbd_debug(SMB,
3490 				    "request smb2 create allocate size : %llu\n",
3491 				    alloc_size);
3492 			smb_break_all_levII_oplock(work, fp, 1);
3493 			err = vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0,
3494 					    alloc_size);
3495 			if (err < 0)
3496 				ksmbd_debug(SMB,
3497 					    "vfs_fallocate is failed : %d\n",
3498 					    err);
3499 		}
3500 
3501 		context = smb2_find_context_vals(req, SMB2_CREATE_QUERY_ON_DISK_ID, 4);
3502 		if (IS_ERR(context)) {
3503 			rc = PTR_ERR(context);
3504 			goto err_out1;
3505 		} else if (context) {
3506 			ksmbd_debug(SMB, "get query on disk id context\n");
3507 			query_disk_id = 1;
3508 		}
3509 	}
3510 
3511 	rc = ksmbd_vfs_getattr(&path, &stat);
3512 	if (rc)
3513 		goto err_out1;
3514 
3515 	if (stat.result_mask & STATX_BTIME)
3516 		fp->create_time = ksmbd_UnixTimeToNT(stat.btime);
3517 	else
3518 		fp->create_time = ksmbd_UnixTimeToNT(stat.ctime);
3519 	if (req->FileAttributes || fp->f_ci->m_fattr == 0)
3520 		fp->f_ci->m_fattr =
3521 			cpu_to_le32(smb2_get_dos_mode(&stat, le32_to_cpu(req->FileAttributes)));
3522 
3523 	if (!created)
3524 		smb2_update_xattrs(tcon, &path, fp);
3525 	else
3526 		smb2_new_xattrs(tcon, &path, fp);
3527 
3528 	memcpy(fp->client_guid, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);
3529 
3530 	if (dh_info.type == DURABLE_REQ_V2 || dh_info.type == DURABLE_REQ) {
3531 		if (dh_info.type == DURABLE_REQ_V2 && dh_info.persistent &&
3532 		    test_share_config_flag(work->tcon->share_conf,
3533 					   KSMBD_SHARE_FLAG_CONTINUOUS_AVAILABILITY))
3534 			fp->is_persistent = true;
3535 		else
3536 			fp->is_durable = true;
3537 
3538 		if (dh_info.type == DURABLE_REQ_V2) {
3539 			memcpy(fp->create_guid, dh_info.CreateGuid,
3540 					SMB2_CREATE_GUID_SIZE);
3541 			if (dh_info.timeout)
3542 				fp->durable_timeout =
3543 					min_t(unsigned int, dh_info.timeout,
3544 					      DURABLE_HANDLE_MAX_TIMEOUT);
3545 			else
3546 				fp->durable_timeout = 60;
3547 		}
3548 	}
3549 
3550 reconnected_fp:
3551 	rsp->StructureSize = cpu_to_le16(89);
3552 	rcu_read_lock();
3553 	opinfo = rcu_dereference(fp->f_opinfo);
3554 	rsp->OplockLevel = opinfo != NULL ? opinfo->level : 0;
3555 	rcu_read_unlock();
3556 	rsp->Flags = 0;
3557 	rsp->CreateAction = cpu_to_le32(file_info);
3558 	rsp->CreationTime = cpu_to_le64(fp->create_time);
3559 	time = ksmbd_UnixTimeToNT(stat.atime);
3560 	rsp->LastAccessTime = cpu_to_le64(time);
3561 	time = ksmbd_UnixTimeToNT(stat.mtime);
3562 	rsp->LastWriteTime = cpu_to_le64(time);
3563 	time = ksmbd_UnixTimeToNT(stat.ctime);
3564 	rsp->ChangeTime = cpu_to_le64(time);
3565 	rsp->AllocationSize = S_ISDIR(stat.mode) ? 0 :
3566 		cpu_to_le64(stat.blocks << 9);
3567 	rsp->EndofFile = S_ISDIR(stat.mode) ? 0 : cpu_to_le64(stat.size);
3568 	rsp->FileAttributes = fp->f_ci->m_fattr;
3569 
3570 	rsp->Reserved2 = 0;
3571 
3572 	rsp->PersistentFileId = fp->persistent_id;
3573 	rsp->VolatileFileId = fp->volatile_id;
3574 
3575 	rsp->CreateContextsOffset = 0;
3576 	rsp->CreateContextsLength = 0;
3577 	iov_len = offsetof(struct smb2_create_rsp, Buffer);
3578 
3579 	/* If lease is request send lease context response */
3580 	if (opinfo && opinfo->is_lease) {
3581 		struct create_context *lease_ccontext;
3582 
3583 		ksmbd_debug(SMB, "lease granted on(%s) lease state 0x%x\n",
3584 			    name, opinfo->o_lease->state);
3585 		rsp->OplockLevel = SMB2_OPLOCK_LEVEL_LEASE;
3586 
3587 		lease_ccontext = (struct create_context *)rsp->Buffer;
3588 		contxt_cnt++;
3589 		create_lease_buf(rsp->Buffer, opinfo->o_lease);
3590 		le32_add_cpu(&rsp->CreateContextsLength,
3591 			     conn->vals->create_lease_size);
3592 		iov_len += conn->vals->create_lease_size;
3593 		next_ptr = &lease_ccontext->Next;
3594 		next_off = conn->vals->create_lease_size;
3595 	}
3596 
3597 	if (maximal_access_ctxt) {
3598 		struct create_context *mxac_ccontext;
3599 
3600 		if (maximal_access == 0)
3601 			ksmbd_vfs_query_maximal_access(idmap,
3602 						       path.dentry,
3603 						       &maximal_access);
3604 		mxac_ccontext = (struct create_context *)(rsp->Buffer +
3605 				le32_to_cpu(rsp->CreateContextsLength));
3606 		contxt_cnt++;
3607 		create_mxac_rsp_buf(rsp->Buffer +
3608 				le32_to_cpu(rsp->CreateContextsLength),
3609 				le32_to_cpu(maximal_access));
3610 		le32_add_cpu(&rsp->CreateContextsLength,
3611 			     conn->vals->create_mxac_size);
3612 		iov_len += conn->vals->create_mxac_size;
3613 		if (next_ptr)
3614 			*next_ptr = cpu_to_le32(next_off);
3615 		next_ptr = &mxac_ccontext->Next;
3616 		next_off = conn->vals->create_mxac_size;
3617 	}
3618 
3619 	if (query_disk_id) {
3620 		struct create_context *disk_id_ccontext;
3621 
3622 		disk_id_ccontext = (struct create_context *)(rsp->Buffer +
3623 				le32_to_cpu(rsp->CreateContextsLength));
3624 		contxt_cnt++;
3625 		create_disk_id_rsp_buf(rsp->Buffer +
3626 				le32_to_cpu(rsp->CreateContextsLength),
3627 				stat.ino, tcon->id);
3628 		le32_add_cpu(&rsp->CreateContextsLength,
3629 			     conn->vals->create_disk_id_size);
3630 		iov_len += conn->vals->create_disk_id_size;
3631 		if (next_ptr)
3632 			*next_ptr = cpu_to_le32(next_off);
3633 		next_ptr = &disk_id_ccontext->Next;
3634 		next_off = conn->vals->create_disk_id_size;
3635 	}
3636 
3637 	if (dh_info.type == DURABLE_REQ || dh_info.type == DURABLE_REQ_V2) {
3638 		struct create_context *durable_ccontext;
3639 
3640 		durable_ccontext = (struct create_context *)(rsp->Buffer +
3641 				le32_to_cpu(rsp->CreateContextsLength));
3642 		contxt_cnt++;
3643 		if (dh_info.type == DURABLE_REQ) {
3644 			create_durable_rsp_buf(rsp->Buffer +
3645 					le32_to_cpu(rsp->CreateContextsLength));
3646 			le32_add_cpu(&rsp->CreateContextsLength,
3647 					conn->vals->create_durable_size);
3648 			iov_len += conn->vals->create_durable_size;
3649 		} else {
3650 			create_durable_v2_rsp_buf(rsp->Buffer +
3651 					le32_to_cpu(rsp->CreateContextsLength),
3652 					fp);
3653 			le32_add_cpu(&rsp->CreateContextsLength,
3654 					conn->vals->create_durable_v2_size);
3655 			iov_len += conn->vals->create_durable_v2_size;
3656 		}
3657 
3658 		if (next_ptr)
3659 			*next_ptr = cpu_to_le32(next_off);
3660 		next_ptr = &durable_ccontext->Next;
3661 		next_off = conn->vals->create_durable_size;
3662 	}
3663 
3664 	if (posix_ctxt) {
3665 		contxt_cnt++;
3666 		create_posix_rsp_buf(rsp->Buffer +
3667 				le32_to_cpu(rsp->CreateContextsLength),
3668 				fp);
3669 		le32_add_cpu(&rsp->CreateContextsLength,
3670 			     conn->vals->create_posix_size);
3671 		iov_len += conn->vals->create_posix_size;
3672 		if (next_ptr)
3673 			*next_ptr = cpu_to_le32(next_off);
3674 	}
3675 
3676 	if (contxt_cnt > 0) {
3677 		rsp->CreateContextsOffset =
3678 			cpu_to_le32(offsetof(struct smb2_create_rsp, Buffer));
3679 	}
3680 
3681 err_out:
3682 	if (rc && (file_present || created))
3683 		ksmbd_vfs_kern_path_unlock(&parent_path, &path);
3684 
3685 err_out1:
3686 	ksmbd_revert_fsids(work);
3687 
3688 err_out2:
3689 	if (!rc) {
3690 		ksmbd_update_fstate(&work->sess->file_table, fp, FP_INITED);
3691 		rc = ksmbd_iov_pin_rsp(work, (void *)rsp, iov_len);
3692 	}
3693 	if (rc) {
3694 		if (rc == -EINVAL)
3695 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
3696 		else if (rc == -EOPNOTSUPP)
3697 			rsp->hdr.Status = STATUS_NOT_SUPPORTED;
3698 		else if (rc == -EACCES || rc == -ESTALE || rc == -EXDEV)
3699 			rsp->hdr.Status = STATUS_ACCESS_DENIED;
3700 		else if (rc == -ENOENT)
3701 			rsp->hdr.Status = STATUS_OBJECT_NAME_INVALID;
3702 		else if (rc == -EPERM)
3703 			rsp->hdr.Status = STATUS_SHARING_VIOLATION;
3704 		else if (rc == -EBUSY)
3705 			rsp->hdr.Status = STATUS_DELETE_PENDING;
3706 		else if (rc == -EBADF)
3707 			rsp->hdr.Status = STATUS_OBJECT_NAME_NOT_FOUND;
3708 		else if (rc == -ENOEXEC)
3709 			rsp->hdr.Status = STATUS_DUPLICATE_OBJECTID;
3710 		else if (rc == -ENXIO)
3711 			rsp->hdr.Status = STATUS_NO_SUCH_DEVICE;
3712 		else if (rc == -EEXIST)
3713 			rsp->hdr.Status = STATUS_OBJECT_NAME_COLLISION;
3714 		else if (rc == -EMFILE)
3715 			rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
3716 		if (!rsp->hdr.Status)
3717 			rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;
3718 
3719 		if (fp)
3720 			ksmbd_fd_put(work, fp);
3721 		smb2_set_err_rsp(work);
3722 		ksmbd_debug(SMB, "Error response: %x\n", rsp->hdr.Status);
3723 	}
3724 
3725 	kfree(name);
3726 	kfree(lc);
3727 
3728 	return rc;
3729 }
3730 
readdir_info_level_struct_sz(int info_level)3731 static int readdir_info_level_struct_sz(int info_level)
3732 {
3733 	switch (info_level) {
3734 	case FILE_FULL_DIRECTORY_INFORMATION:
3735 		return sizeof(struct file_full_directory_info);
3736 	case FILE_BOTH_DIRECTORY_INFORMATION:
3737 		return sizeof(struct file_both_directory_info);
3738 	case FILE_DIRECTORY_INFORMATION:
3739 		return sizeof(struct file_directory_info);
3740 	case FILE_NAMES_INFORMATION:
3741 		return sizeof(struct file_names_info);
3742 	case FILEID_FULL_DIRECTORY_INFORMATION:
3743 		return sizeof(struct file_id_full_dir_info);
3744 	case FILEID_BOTH_DIRECTORY_INFORMATION:
3745 		return sizeof(struct file_id_both_directory_info);
3746 	case SMB_FIND_FILE_POSIX_INFO:
3747 		return sizeof(struct smb2_posix_info);
3748 	default:
3749 		return -EOPNOTSUPP;
3750 	}
3751 }
3752 
dentry_name(struct ksmbd_dir_info * d_info,int info_level)3753 static int dentry_name(struct ksmbd_dir_info *d_info, int info_level)
3754 {
3755 	switch (info_level) {
3756 	case FILE_FULL_DIRECTORY_INFORMATION:
3757 	{
3758 		struct file_full_directory_info *ffdinfo;
3759 
3760 		ffdinfo = (struct file_full_directory_info *)d_info->rptr;
3761 		d_info->rptr += le32_to_cpu(ffdinfo->NextEntryOffset);
3762 		d_info->name = ffdinfo->FileName;
3763 		d_info->name_len = le32_to_cpu(ffdinfo->FileNameLength);
3764 		return 0;
3765 	}
3766 	case FILE_BOTH_DIRECTORY_INFORMATION:
3767 	{
3768 		struct file_both_directory_info *fbdinfo;
3769 
3770 		fbdinfo = (struct file_both_directory_info *)d_info->rptr;
3771 		d_info->rptr += le32_to_cpu(fbdinfo->NextEntryOffset);
3772 		d_info->name = fbdinfo->FileName;
3773 		d_info->name_len = le32_to_cpu(fbdinfo->FileNameLength);
3774 		return 0;
3775 	}
3776 	case FILE_DIRECTORY_INFORMATION:
3777 	{
3778 		struct file_directory_info *fdinfo;
3779 
3780 		fdinfo = (struct file_directory_info *)d_info->rptr;
3781 		d_info->rptr += le32_to_cpu(fdinfo->NextEntryOffset);
3782 		d_info->name = fdinfo->FileName;
3783 		d_info->name_len = le32_to_cpu(fdinfo->FileNameLength);
3784 		return 0;
3785 	}
3786 	case FILE_NAMES_INFORMATION:
3787 	{
3788 		struct file_names_info *fninfo;
3789 
3790 		fninfo = (struct file_names_info *)d_info->rptr;
3791 		d_info->rptr += le32_to_cpu(fninfo->NextEntryOffset);
3792 		d_info->name = fninfo->FileName;
3793 		d_info->name_len = le32_to_cpu(fninfo->FileNameLength);
3794 		return 0;
3795 	}
3796 	case FILEID_FULL_DIRECTORY_INFORMATION:
3797 	{
3798 		struct file_id_full_dir_info *dinfo;
3799 
3800 		dinfo = (struct file_id_full_dir_info *)d_info->rptr;
3801 		d_info->rptr += le32_to_cpu(dinfo->NextEntryOffset);
3802 		d_info->name = dinfo->FileName;
3803 		d_info->name_len = le32_to_cpu(dinfo->FileNameLength);
3804 		return 0;
3805 	}
3806 	case FILEID_BOTH_DIRECTORY_INFORMATION:
3807 	{
3808 		struct file_id_both_directory_info *fibdinfo;
3809 
3810 		fibdinfo = (struct file_id_both_directory_info *)d_info->rptr;
3811 		d_info->rptr += le32_to_cpu(fibdinfo->NextEntryOffset);
3812 		d_info->name = fibdinfo->FileName;
3813 		d_info->name_len = le32_to_cpu(fibdinfo->FileNameLength);
3814 		return 0;
3815 	}
3816 	case SMB_FIND_FILE_POSIX_INFO:
3817 	{
3818 		struct smb2_posix_info *posix_info;
3819 
3820 		posix_info = (struct smb2_posix_info *)d_info->rptr;
3821 		d_info->rptr += le32_to_cpu(posix_info->NextEntryOffset);
3822 		d_info->name = posix_info->name;
3823 		d_info->name_len = le32_to_cpu(posix_info->name_len);
3824 		return 0;
3825 	}
3826 	default:
3827 		return -EINVAL;
3828 	}
3829 }
3830 
3831 /**
3832  * smb2_populate_readdir_entry() - encode directory entry in smb2 response
3833  * buffer
3834  * @conn:	connection instance
3835  * @info_level:	smb information level
3836  * @d_info:	structure included variables for query dir
3837  * @ksmbd_kstat:	ksmbd wrapper of dirent stat information
3838  *
3839  * if directory has many entries, find first can't read it fully.
3840  * find next might be called multiple times to read remaining dir entries
3841  *
3842  * Return:	0 on success, otherwise error
3843  */
smb2_populate_readdir_entry(struct ksmbd_conn * conn,int info_level,struct ksmbd_dir_info * d_info,struct ksmbd_kstat * ksmbd_kstat)3844 static int smb2_populate_readdir_entry(struct ksmbd_conn *conn, int info_level,
3845 				       struct ksmbd_dir_info *d_info,
3846 				       struct ksmbd_kstat *ksmbd_kstat)
3847 {
3848 	int next_entry_offset = 0;
3849 	char *conv_name;
3850 	int conv_len;
3851 	void *kstat;
3852 	int struct_sz, rc = 0;
3853 
3854 	conv_name = ksmbd_convert_dir_info_name(d_info,
3855 						conn->local_nls,
3856 						&conv_len);
3857 	if (!conv_name)
3858 		return -ENOMEM;
3859 
3860 	/* Somehow the name has only terminating NULL bytes */
3861 	if (conv_len < 0) {
3862 		rc = -EINVAL;
3863 		goto free_conv_name;
3864 	}
3865 
3866 	struct_sz = readdir_info_level_struct_sz(info_level) + conv_len;
3867 	next_entry_offset = ALIGN(struct_sz, KSMBD_DIR_INFO_ALIGNMENT);
3868 	d_info->last_entry_off_align = next_entry_offset - struct_sz;
3869 
3870 	if (next_entry_offset > d_info->out_buf_len) {
3871 		d_info->out_buf_len = 0;
3872 		rc = -ENOSPC;
3873 		goto free_conv_name;
3874 	}
3875 
3876 	kstat = d_info->wptr;
3877 	if (info_level != FILE_NAMES_INFORMATION)
3878 		kstat = ksmbd_vfs_init_kstat(&d_info->wptr, ksmbd_kstat);
3879 
3880 	switch (info_level) {
3881 	case FILE_FULL_DIRECTORY_INFORMATION:
3882 	{
3883 		struct file_full_directory_info *ffdinfo;
3884 
3885 		ffdinfo = (struct file_full_directory_info *)kstat;
3886 		ffdinfo->FileNameLength = cpu_to_le32(conv_len);
3887 		ffdinfo->EaSize =
3888 			smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
3889 		if (ffdinfo->EaSize)
3890 			ffdinfo->ExtFileAttributes = FILE_ATTRIBUTE_REPARSE_POINT_LE;
3891 		if (d_info->hide_dot_file && d_info->name[0] == '.')
3892 			ffdinfo->ExtFileAttributes |= FILE_ATTRIBUTE_HIDDEN_LE;
3893 		memcpy(ffdinfo->FileName, conv_name, conv_len);
3894 		ffdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
3895 		break;
3896 	}
3897 	case FILE_BOTH_DIRECTORY_INFORMATION:
3898 	{
3899 		struct file_both_directory_info *fbdinfo;
3900 
3901 		fbdinfo = (struct file_both_directory_info *)kstat;
3902 		fbdinfo->FileNameLength = cpu_to_le32(conv_len);
3903 		fbdinfo->EaSize =
3904 			smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
3905 		if (fbdinfo->EaSize)
3906 			fbdinfo->ExtFileAttributes = FILE_ATTRIBUTE_REPARSE_POINT_LE;
3907 		fbdinfo->ShortNameLength = 0;
3908 		fbdinfo->Reserved = 0;
3909 		if (d_info->hide_dot_file && d_info->name[0] == '.')
3910 			fbdinfo->ExtFileAttributes |= FILE_ATTRIBUTE_HIDDEN_LE;
3911 		memcpy(fbdinfo->FileName, conv_name, conv_len);
3912 		fbdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
3913 		break;
3914 	}
3915 	case FILE_DIRECTORY_INFORMATION:
3916 	{
3917 		struct file_directory_info *fdinfo;
3918 
3919 		fdinfo = (struct file_directory_info *)kstat;
3920 		fdinfo->FileNameLength = cpu_to_le32(conv_len);
3921 		if (d_info->hide_dot_file && d_info->name[0] == '.')
3922 			fdinfo->ExtFileAttributes |= FILE_ATTRIBUTE_HIDDEN_LE;
3923 		memcpy(fdinfo->FileName, conv_name, conv_len);
3924 		fdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
3925 		break;
3926 	}
3927 	case FILE_NAMES_INFORMATION:
3928 	{
3929 		struct file_names_info *fninfo;
3930 
3931 		fninfo = (struct file_names_info *)kstat;
3932 		fninfo->FileNameLength = cpu_to_le32(conv_len);
3933 		memcpy(fninfo->FileName, conv_name, conv_len);
3934 		fninfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
3935 		break;
3936 	}
3937 	case FILEID_FULL_DIRECTORY_INFORMATION:
3938 	{
3939 		struct file_id_full_dir_info *dinfo;
3940 
3941 		dinfo = (struct file_id_full_dir_info *)kstat;
3942 		dinfo->FileNameLength = cpu_to_le32(conv_len);
3943 		dinfo->EaSize =
3944 			smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
3945 		if (dinfo->EaSize)
3946 			dinfo->ExtFileAttributes = FILE_ATTRIBUTE_REPARSE_POINT_LE;
3947 		dinfo->Reserved = 0;
3948 		dinfo->UniqueId = cpu_to_le64(ksmbd_kstat->kstat->ino);
3949 		if (d_info->hide_dot_file && d_info->name[0] == '.')
3950 			dinfo->ExtFileAttributes |= FILE_ATTRIBUTE_HIDDEN_LE;
3951 		memcpy(dinfo->FileName, conv_name, conv_len);
3952 		dinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
3953 		break;
3954 	}
3955 	case FILEID_BOTH_DIRECTORY_INFORMATION:
3956 	{
3957 		struct file_id_both_directory_info *fibdinfo;
3958 
3959 		fibdinfo = (struct file_id_both_directory_info *)kstat;
3960 		fibdinfo->FileNameLength = cpu_to_le32(conv_len);
3961 		fibdinfo->EaSize =
3962 			smb2_get_reparse_tag_special_file(ksmbd_kstat->kstat->mode);
3963 		if (fibdinfo->EaSize)
3964 			fibdinfo->ExtFileAttributes = FILE_ATTRIBUTE_REPARSE_POINT_LE;
3965 		fibdinfo->UniqueId = cpu_to_le64(ksmbd_kstat->kstat->ino);
3966 		fibdinfo->ShortNameLength = 0;
3967 		fibdinfo->Reserved = 0;
3968 		fibdinfo->Reserved2 = cpu_to_le16(0);
3969 		if (d_info->hide_dot_file && d_info->name[0] == '.')
3970 			fibdinfo->ExtFileAttributes |= FILE_ATTRIBUTE_HIDDEN_LE;
3971 		memcpy(fibdinfo->FileName, conv_name, conv_len);
3972 		fibdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
3973 		break;
3974 	}
3975 	case SMB_FIND_FILE_POSIX_INFO:
3976 	{
3977 		struct smb2_posix_info *posix_info;
3978 		u64 time;
3979 
3980 		posix_info = (struct smb2_posix_info *)kstat;
3981 		posix_info->Ignored = 0;
3982 		posix_info->CreationTime = cpu_to_le64(ksmbd_kstat->create_time);
3983 		time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->ctime);
3984 		posix_info->ChangeTime = cpu_to_le64(time);
3985 		time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->atime);
3986 		posix_info->LastAccessTime = cpu_to_le64(time);
3987 		time = ksmbd_UnixTimeToNT(ksmbd_kstat->kstat->mtime);
3988 		posix_info->LastWriteTime = cpu_to_le64(time);
3989 		posix_info->EndOfFile = cpu_to_le64(ksmbd_kstat->kstat->size);
3990 		posix_info->AllocationSize = cpu_to_le64(ksmbd_kstat->kstat->blocks << 9);
3991 		posix_info->DeviceId = cpu_to_le32(ksmbd_kstat->kstat->rdev);
3992 		posix_info->HardLinks = cpu_to_le32(ksmbd_kstat->kstat->nlink);
3993 		posix_info->Mode = cpu_to_le32(ksmbd_kstat->kstat->mode & 0777);
3994 		posix_info->Inode = cpu_to_le64(ksmbd_kstat->kstat->ino);
3995 		posix_info->DosAttributes =
3996 			S_ISDIR(ksmbd_kstat->kstat->mode) ?
3997 				FILE_ATTRIBUTE_DIRECTORY_LE : FILE_ATTRIBUTE_ARCHIVE_LE;
3998 		if (d_info->hide_dot_file && d_info->name[0] == '.')
3999 			posix_info->DosAttributes |= FILE_ATTRIBUTE_HIDDEN_LE;
4000 		/*
4001 		 * SidBuffer(32) contain two sids(Domain sid(16), UNIX group sid(16)).
4002 		 * UNIX sid(16) = revision(1) + num_subauth(1) + authority(6) +
4003 		 *		  sub_auth(4 * 1(num_subauth)) + RID(4).
4004 		 */
4005 		id_to_sid(from_kuid_munged(&init_user_ns, ksmbd_kstat->kstat->uid),
4006 			  SIDUNIX_USER, (struct smb_sid *)&posix_info->SidBuffer[0]);
4007 		id_to_sid(from_kgid_munged(&init_user_ns, ksmbd_kstat->kstat->gid),
4008 			  SIDUNIX_GROUP, (struct smb_sid *)&posix_info->SidBuffer[16]);
4009 		memcpy(posix_info->name, conv_name, conv_len);
4010 		posix_info->name_len = cpu_to_le32(conv_len);
4011 		posix_info->NextEntryOffset = cpu_to_le32(next_entry_offset);
4012 		break;
4013 	}
4014 
4015 	} /* switch (info_level) */
4016 
4017 	d_info->last_entry_offset = d_info->data_count;
4018 	d_info->data_count += next_entry_offset;
4019 	d_info->out_buf_len -= next_entry_offset;
4020 	d_info->wptr += next_entry_offset;
4021 
4022 	ksmbd_debug(SMB,
4023 		    "info_level : %d, buf_len :%d, next_offset : %d, data_count : %d\n",
4024 		    info_level, d_info->out_buf_len,
4025 		    next_entry_offset, d_info->data_count);
4026 
4027 free_conv_name:
4028 	kfree(conv_name);
4029 	return rc;
4030 }
4031 
4032 struct smb2_query_dir_private {
4033 	struct ksmbd_work	*work;
4034 	char			*search_pattern;
4035 	struct ksmbd_file	*dir_fp;
4036 
4037 	struct ksmbd_dir_info	*d_info;
4038 	int			info_level;
4039 };
4040 
lock_dir(struct ksmbd_file * dir_fp)4041 static void lock_dir(struct ksmbd_file *dir_fp)
4042 {
4043 	struct dentry *dir = dir_fp->filp->f_path.dentry;
4044 
4045 	inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
4046 }
4047 
unlock_dir(struct ksmbd_file * dir_fp)4048 static void unlock_dir(struct ksmbd_file *dir_fp)
4049 {
4050 	struct dentry *dir = dir_fp->filp->f_path.dentry;
4051 
4052 	inode_unlock(d_inode(dir));
4053 }
4054 
process_query_dir_entries(struct smb2_query_dir_private * priv)4055 static int process_query_dir_entries(struct smb2_query_dir_private *priv)
4056 {
4057 	struct mnt_idmap	*idmap = file_mnt_idmap(priv->dir_fp->filp);
4058 	struct kstat		kstat;
4059 	struct ksmbd_kstat	ksmbd_kstat;
4060 	int			rc;
4061 	int			i;
4062 
4063 	for (i = 0; i < priv->d_info->num_entry; i++) {
4064 		struct dentry *dent;
4065 
4066 		if (dentry_name(priv->d_info, priv->info_level))
4067 			return -EINVAL;
4068 
4069 		lock_dir(priv->dir_fp);
4070 		dent = lookup_one(idmap, priv->d_info->name,
4071 				  priv->dir_fp->filp->f_path.dentry,
4072 				  priv->d_info->name_len);
4073 		unlock_dir(priv->dir_fp);
4074 
4075 		if (IS_ERR(dent)) {
4076 			ksmbd_debug(SMB, "Cannot lookup `%s' [%ld]\n",
4077 				    priv->d_info->name,
4078 				    PTR_ERR(dent));
4079 			continue;
4080 		}
4081 		if (unlikely(d_is_negative(dent))) {
4082 			dput(dent);
4083 			ksmbd_debug(SMB, "Negative dentry `%s'\n",
4084 				    priv->d_info->name);
4085 			continue;
4086 		}
4087 
4088 		ksmbd_kstat.kstat = &kstat;
4089 		if (priv->info_level != FILE_NAMES_INFORMATION) {
4090 			rc = ksmbd_vfs_fill_dentry_attrs(priv->work,
4091 							 idmap,
4092 							 dent,
4093 							 &ksmbd_kstat);
4094 			if (rc) {
4095 				dput(dent);
4096 				continue;
4097 			}
4098 		}
4099 
4100 		rc = smb2_populate_readdir_entry(priv->work->conn,
4101 						 priv->info_level,
4102 						 priv->d_info,
4103 						 &ksmbd_kstat);
4104 		dput(dent);
4105 		if (rc)
4106 			return rc;
4107 	}
4108 	return 0;
4109 }
4110 
reserve_populate_dentry(struct ksmbd_dir_info * d_info,int info_level)4111 static int reserve_populate_dentry(struct ksmbd_dir_info *d_info,
4112 				   int info_level)
4113 {
4114 	int struct_sz;
4115 	int conv_len;
4116 	int next_entry_offset;
4117 
4118 	struct_sz = readdir_info_level_struct_sz(info_level);
4119 	if (struct_sz == -EOPNOTSUPP)
4120 		return -EOPNOTSUPP;
4121 
4122 	conv_len = (d_info->name_len + 1) * 2;
4123 	next_entry_offset = ALIGN(struct_sz + conv_len,
4124 				  KSMBD_DIR_INFO_ALIGNMENT);
4125 
4126 	if (next_entry_offset > d_info->out_buf_len) {
4127 		d_info->out_buf_len = 0;
4128 		return -ENOSPC;
4129 	}
4130 
4131 	switch (info_level) {
4132 	case FILE_FULL_DIRECTORY_INFORMATION:
4133 	{
4134 		struct file_full_directory_info *ffdinfo;
4135 
4136 		ffdinfo = (struct file_full_directory_info *)d_info->wptr;
4137 		memcpy(ffdinfo->FileName, d_info->name, d_info->name_len);
4138 		ffdinfo->FileName[d_info->name_len] = 0x00;
4139 		ffdinfo->FileNameLength = cpu_to_le32(d_info->name_len);
4140 		ffdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
4141 		break;
4142 	}
4143 	case FILE_BOTH_DIRECTORY_INFORMATION:
4144 	{
4145 		struct file_both_directory_info *fbdinfo;
4146 
4147 		fbdinfo = (struct file_both_directory_info *)d_info->wptr;
4148 		memcpy(fbdinfo->FileName, d_info->name, d_info->name_len);
4149 		fbdinfo->FileName[d_info->name_len] = 0x00;
4150 		fbdinfo->FileNameLength = cpu_to_le32(d_info->name_len);
4151 		fbdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
4152 		break;
4153 	}
4154 	case FILE_DIRECTORY_INFORMATION:
4155 	{
4156 		struct file_directory_info *fdinfo;
4157 
4158 		fdinfo = (struct file_directory_info *)d_info->wptr;
4159 		memcpy(fdinfo->FileName, d_info->name, d_info->name_len);
4160 		fdinfo->FileName[d_info->name_len] = 0x00;
4161 		fdinfo->FileNameLength = cpu_to_le32(d_info->name_len);
4162 		fdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
4163 		break;
4164 	}
4165 	case FILE_NAMES_INFORMATION:
4166 	{
4167 		struct file_names_info *fninfo;
4168 
4169 		fninfo = (struct file_names_info *)d_info->wptr;
4170 		memcpy(fninfo->FileName, d_info->name, d_info->name_len);
4171 		fninfo->FileName[d_info->name_len] = 0x00;
4172 		fninfo->FileNameLength = cpu_to_le32(d_info->name_len);
4173 		fninfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
4174 		break;
4175 	}
4176 	case FILEID_FULL_DIRECTORY_INFORMATION:
4177 	{
4178 		struct file_id_full_dir_info *dinfo;
4179 
4180 		dinfo = (struct file_id_full_dir_info *)d_info->wptr;
4181 		memcpy(dinfo->FileName, d_info->name, d_info->name_len);
4182 		dinfo->FileName[d_info->name_len] = 0x00;
4183 		dinfo->FileNameLength = cpu_to_le32(d_info->name_len);
4184 		dinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
4185 		break;
4186 	}
4187 	case FILEID_BOTH_DIRECTORY_INFORMATION:
4188 	{
4189 		struct file_id_both_directory_info *fibdinfo;
4190 
4191 		fibdinfo = (struct file_id_both_directory_info *)d_info->wptr;
4192 		memcpy(fibdinfo->FileName, d_info->name, d_info->name_len);
4193 		fibdinfo->FileName[d_info->name_len] = 0x00;
4194 		fibdinfo->FileNameLength = cpu_to_le32(d_info->name_len);
4195 		fibdinfo->NextEntryOffset = cpu_to_le32(next_entry_offset);
4196 		break;
4197 	}
4198 	case SMB_FIND_FILE_POSIX_INFO:
4199 	{
4200 		struct smb2_posix_info *posix_info;
4201 
4202 		posix_info = (struct smb2_posix_info *)d_info->wptr;
4203 		memcpy(posix_info->name, d_info->name, d_info->name_len);
4204 		posix_info->name[d_info->name_len] = 0x00;
4205 		posix_info->name_len = cpu_to_le32(d_info->name_len);
4206 		posix_info->NextEntryOffset =
4207 			cpu_to_le32(next_entry_offset);
4208 		break;
4209 	}
4210 	} /* switch (info_level) */
4211 
4212 	d_info->num_entry++;
4213 	d_info->out_buf_len -= next_entry_offset;
4214 	d_info->wptr += next_entry_offset;
4215 	return 0;
4216 }
4217 
__query_dir(struct dir_context * ctx,const char * name,int namlen,loff_t offset,u64 ino,unsigned int d_type)4218 static bool __query_dir(struct dir_context *ctx, const char *name, int namlen,
4219 		       loff_t offset, u64 ino, unsigned int d_type)
4220 {
4221 	struct ksmbd_readdir_data	*buf;
4222 	struct smb2_query_dir_private	*priv;
4223 	struct ksmbd_dir_info		*d_info;
4224 	int				rc;
4225 
4226 	buf	= container_of(ctx, struct ksmbd_readdir_data, ctx);
4227 	priv	= buf->private;
4228 	d_info	= priv->d_info;
4229 
4230 	/* dot and dotdot entries are already reserved */
4231 	if (!strcmp(".", name) || !strcmp("..", name))
4232 		return true;
4233 	d_info->num_scan++;
4234 	if (ksmbd_share_veto_filename(priv->work->tcon->share_conf, name))
4235 		return true;
4236 	if (!match_pattern(name, namlen, priv->search_pattern))
4237 		return true;
4238 
4239 	d_info->name		= name;
4240 	d_info->name_len	= namlen;
4241 	rc = reserve_populate_dentry(d_info, priv->info_level);
4242 	if (rc)
4243 		return false;
4244 	if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY)
4245 		d_info->out_buf_len = 0;
4246 	return true;
4247 }
4248 
verify_info_level(int info_level)4249 static int verify_info_level(int info_level)
4250 {
4251 	switch (info_level) {
4252 	case FILE_FULL_DIRECTORY_INFORMATION:
4253 	case FILE_BOTH_DIRECTORY_INFORMATION:
4254 	case FILE_DIRECTORY_INFORMATION:
4255 	case FILE_NAMES_INFORMATION:
4256 	case FILEID_FULL_DIRECTORY_INFORMATION:
4257 	case FILEID_BOTH_DIRECTORY_INFORMATION:
4258 	case SMB_FIND_FILE_POSIX_INFO:
4259 		break;
4260 	default:
4261 		return -EOPNOTSUPP;
4262 	}
4263 
4264 	return 0;
4265 }
4266 
smb2_resp_buf_len(struct ksmbd_work * work,unsigned short hdr2_len)4267 static int smb2_resp_buf_len(struct ksmbd_work *work, unsigned short hdr2_len)
4268 {
4269 	int free_len;
4270 
4271 	free_len = (int)(work->response_sz -
4272 		(get_rfc1002_len(work->response_buf) + 4)) - hdr2_len;
4273 	return free_len;
4274 }
4275 
smb2_calc_max_out_buf_len(struct ksmbd_work * work,unsigned short hdr2_len,unsigned int out_buf_len)4276 static int smb2_calc_max_out_buf_len(struct ksmbd_work *work,
4277 				     unsigned short hdr2_len,
4278 				     unsigned int out_buf_len)
4279 {
4280 	int free_len;
4281 
4282 	if (out_buf_len > work->conn->vals->max_trans_size)
4283 		return -EINVAL;
4284 
4285 	free_len = smb2_resp_buf_len(work, hdr2_len);
4286 	if (free_len < 0)
4287 		return -EINVAL;
4288 
4289 	return min_t(int, out_buf_len, free_len);
4290 }
4291 
smb2_query_dir(struct ksmbd_work * work)4292 int smb2_query_dir(struct ksmbd_work *work)
4293 {
4294 	struct ksmbd_conn *conn = work->conn;
4295 	struct smb2_query_directory_req *req;
4296 	struct smb2_query_directory_rsp *rsp;
4297 	struct ksmbd_share_config *share = work->tcon->share_conf;
4298 	struct ksmbd_file *dir_fp = NULL;
4299 	struct ksmbd_dir_info d_info;
4300 	int rc = 0;
4301 	char *srch_ptr = NULL;
4302 	unsigned char srch_flag;
4303 	int buffer_sz;
4304 	struct smb2_query_dir_private query_dir_private = {NULL, };
4305 
4306 	ksmbd_debug(SMB, "Received smb2 query directory request\n");
4307 
4308 	WORK_BUFFERS(work, req, rsp);
4309 
4310 	if (ksmbd_override_fsids(work)) {
4311 		rsp->hdr.Status = STATUS_NO_MEMORY;
4312 		smb2_set_err_rsp(work);
4313 		return -ENOMEM;
4314 	}
4315 
4316 	rc = verify_info_level(req->FileInformationClass);
4317 	if (rc) {
4318 		rc = -EFAULT;
4319 		goto err_out2;
4320 	}
4321 
4322 	dir_fp = ksmbd_lookup_fd_slow(work, req->VolatileFileId, req->PersistentFileId);
4323 	if (!dir_fp) {
4324 		rc = -EBADF;
4325 		goto err_out2;
4326 	}
4327 
4328 	if (!(dir_fp->daccess & FILE_LIST_DIRECTORY_LE) ||
4329 	    inode_permission(file_mnt_idmap(dir_fp->filp),
4330 			     file_inode(dir_fp->filp),
4331 			     MAY_READ | MAY_EXEC)) {
4332 		pr_err("no right to enumerate directory (%pD)\n", dir_fp->filp);
4333 		rc = -EACCES;
4334 		goto err_out2;
4335 	}
4336 
4337 	if (!S_ISDIR(file_inode(dir_fp->filp)->i_mode)) {
4338 		pr_err("can't do query dir for a file\n");
4339 		rc = -EINVAL;
4340 		goto err_out2;
4341 	}
4342 
4343 	srch_flag = req->Flags;
4344 	srch_ptr = smb_strndup_from_utf16((char *)req + le16_to_cpu(req->FileNameOffset),
4345 					  le16_to_cpu(req->FileNameLength), 1,
4346 					  conn->local_nls);
4347 	if (IS_ERR(srch_ptr)) {
4348 		ksmbd_debug(SMB, "Search Pattern not found\n");
4349 		rc = -EINVAL;
4350 		goto err_out2;
4351 	} else {
4352 		ksmbd_debug(SMB, "Search pattern is %s\n", srch_ptr);
4353 	}
4354 
4355 	if (srch_flag & SMB2_REOPEN || srch_flag & SMB2_RESTART_SCANS) {
4356 		ksmbd_debug(SMB, "Restart directory scan\n");
4357 		generic_file_llseek(dir_fp->filp, 0, SEEK_SET);
4358 	}
4359 
4360 	memset(&d_info, 0, sizeof(struct ksmbd_dir_info));
4361 	d_info.wptr = (char *)rsp->Buffer;
4362 	d_info.rptr = (char *)rsp->Buffer;
4363 	d_info.out_buf_len =
4364 		smb2_calc_max_out_buf_len(work, 8,
4365 					  le32_to_cpu(req->OutputBufferLength));
4366 	if (d_info.out_buf_len < 0) {
4367 		rc = -EINVAL;
4368 		goto err_out;
4369 	}
4370 	d_info.flags = srch_flag;
4371 
4372 	/*
4373 	 * reserve dot and dotdot entries in head of buffer
4374 	 * in first response
4375 	 */
4376 	rc = ksmbd_populate_dot_dotdot_entries(work, req->FileInformationClass,
4377 					       dir_fp, &d_info, srch_ptr,
4378 					       smb2_populate_readdir_entry);
4379 	if (rc == -ENOSPC)
4380 		rc = 0;
4381 	else if (rc)
4382 		goto err_out;
4383 
4384 	if (test_share_config_flag(share, KSMBD_SHARE_FLAG_HIDE_DOT_FILES))
4385 		d_info.hide_dot_file = true;
4386 
4387 	buffer_sz				= d_info.out_buf_len;
4388 	d_info.rptr				= d_info.wptr;
4389 	query_dir_private.work			= work;
4390 	query_dir_private.search_pattern	= srch_ptr;
4391 	query_dir_private.dir_fp		= dir_fp;
4392 	query_dir_private.d_info		= &d_info;
4393 	query_dir_private.info_level		= req->FileInformationClass;
4394 	dir_fp->readdir_data.private		= &query_dir_private;
4395 	set_ctx_actor(&dir_fp->readdir_data.ctx, __query_dir);
4396 again:
4397 	d_info.num_scan = 0;
4398 	rc = iterate_dir(dir_fp->filp, &dir_fp->readdir_data.ctx);
4399 	/*
4400 	 * num_entry can be 0 if the directory iteration stops before reaching
4401 	 * the end of the directory and no file is matched with the search
4402 	 * pattern.
4403 	 */
4404 	if (rc >= 0 && !d_info.num_entry && d_info.num_scan &&
4405 	    d_info.out_buf_len > 0)
4406 		goto again;
4407 	/*
4408 	 * req->OutputBufferLength is too small to contain even one entry.
4409 	 * In this case, it immediately returns OutputBufferLength 0 to client.
4410 	 */
4411 	if (!d_info.out_buf_len && !d_info.num_entry)
4412 		goto no_buf_len;
4413 	if (rc > 0 || rc == -ENOSPC)
4414 		rc = 0;
4415 	else if (rc)
4416 		goto err_out;
4417 
4418 	d_info.wptr = d_info.rptr;
4419 	d_info.out_buf_len = buffer_sz;
4420 	rc = process_query_dir_entries(&query_dir_private);
4421 	if (rc)
4422 		goto err_out;
4423 
4424 	if (!d_info.data_count && d_info.out_buf_len >= 0) {
4425 		if (srch_flag & SMB2_RETURN_SINGLE_ENTRY && !is_asterisk(srch_ptr)) {
4426 			rsp->hdr.Status = STATUS_NO_SUCH_FILE;
4427 		} else {
4428 			dir_fp->dot_dotdot[0] = dir_fp->dot_dotdot[1] = 0;
4429 			rsp->hdr.Status = STATUS_NO_MORE_FILES;
4430 		}
4431 		rsp->StructureSize = cpu_to_le16(9);
4432 		rsp->OutputBufferOffset = cpu_to_le16(0);
4433 		rsp->OutputBufferLength = cpu_to_le32(0);
4434 		rsp->Buffer[0] = 0;
4435 		rc = ksmbd_iov_pin_rsp(work, (void *)rsp,
4436 				       offsetof(struct smb2_query_directory_rsp, Buffer)
4437 				       + 1);
4438 		if (rc)
4439 			goto err_out;
4440 	} else {
4441 no_buf_len:
4442 		((struct file_directory_info *)
4443 		((char *)rsp->Buffer + d_info.last_entry_offset))
4444 		->NextEntryOffset = 0;
4445 		if (d_info.data_count >= d_info.last_entry_off_align)
4446 			d_info.data_count -= d_info.last_entry_off_align;
4447 
4448 		rsp->StructureSize = cpu_to_le16(9);
4449 		rsp->OutputBufferOffset = cpu_to_le16(72);
4450 		rsp->OutputBufferLength = cpu_to_le32(d_info.data_count);
4451 		rc = ksmbd_iov_pin_rsp(work, (void *)rsp,
4452 				       offsetof(struct smb2_query_directory_rsp, Buffer) +
4453 				       d_info.data_count);
4454 		if (rc)
4455 			goto err_out;
4456 	}
4457 
4458 	kfree(srch_ptr);
4459 	ksmbd_fd_put(work, dir_fp);
4460 	ksmbd_revert_fsids(work);
4461 	return 0;
4462 
4463 err_out:
4464 	pr_err("error while processing smb2 query dir rc = %d\n", rc);
4465 	kfree(srch_ptr);
4466 
4467 err_out2:
4468 	if (rc == -EINVAL)
4469 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
4470 	else if (rc == -EACCES)
4471 		rsp->hdr.Status = STATUS_ACCESS_DENIED;
4472 	else if (rc == -ENOENT)
4473 		rsp->hdr.Status = STATUS_NO_SUCH_FILE;
4474 	else if (rc == -EBADF)
4475 		rsp->hdr.Status = STATUS_FILE_CLOSED;
4476 	else if (rc == -ENOMEM)
4477 		rsp->hdr.Status = STATUS_NO_MEMORY;
4478 	else if (rc == -EFAULT)
4479 		rsp->hdr.Status = STATUS_INVALID_INFO_CLASS;
4480 	else if (rc == -EIO)
4481 		rsp->hdr.Status = STATUS_FILE_CORRUPT_ERROR;
4482 	if (!rsp->hdr.Status)
4483 		rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;
4484 
4485 	smb2_set_err_rsp(work);
4486 	ksmbd_fd_put(work, dir_fp);
4487 	ksmbd_revert_fsids(work);
4488 	return 0;
4489 }
4490 
4491 /**
4492  * buffer_check_err() - helper function to check buffer errors
4493  * @reqOutputBufferLength:	max buffer length expected in command response
4494  * @rsp:		query info response buffer contains output buffer length
4495  * @rsp_org:		base response buffer pointer in case of chained response
4496  *
4497  * Return:	0 on success, otherwise error
4498  */
buffer_check_err(int reqOutputBufferLength,struct smb2_query_info_rsp * rsp,void * rsp_org)4499 static int buffer_check_err(int reqOutputBufferLength,
4500 			    struct smb2_query_info_rsp *rsp,
4501 			    void *rsp_org)
4502 {
4503 	if (reqOutputBufferLength < le32_to_cpu(rsp->OutputBufferLength)) {
4504 		pr_err("Invalid Buffer Size Requested\n");
4505 		rsp->hdr.Status = STATUS_INFO_LENGTH_MISMATCH;
4506 		*(__be32 *)rsp_org = cpu_to_be32(sizeof(struct smb2_hdr));
4507 		return -EINVAL;
4508 	}
4509 	return 0;
4510 }
4511 
get_standard_info_pipe(struct smb2_query_info_rsp * rsp,void * rsp_org)4512 static void get_standard_info_pipe(struct smb2_query_info_rsp *rsp,
4513 				   void *rsp_org)
4514 {
4515 	struct smb2_file_standard_info *sinfo;
4516 
4517 	sinfo = (struct smb2_file_standard_info *)rsp->Buffer;
4518 
4519 	sinfo->AllocationSize = cpu_to_le64(4096);
4520 	sinfo->EndOfFile = cpu_to_le64(0);
4521 	sinfo->NumberOfLinks = cpu_to_le32(1);
4522 	sinfo->DeletePending = 1;
4523 	sinfo->Directory = 0;
4524 	rsp->OutputBufferLength =
4525 		cpu_to_le32(sizeof(struct smb2_file_standard_info));
4526 }
4527 
get_internal_info_pipe(struct smb2_query_info_rsp * rsp,u64 num,void * rsp_org)4528 static void get_internal_info_pipe(struct smb2_query_info_rsp *rsp, u64 num,
4529 				   void *rsp_org)
4530 {
4531 	struct smb2_file_internal_info *file_info;
4532 
4533 	file_info = (struct smb2_file_internal_info *)rsp->Buffer;
4534 
4535 	/* any unique number */
4536 	file_info->IndexNumber = cpu_to_le64(num | (1ULL << 63));
4537 	rsp->OutputBufferLength =
4538 		cpu_to_le32(sizeof(struct smb2_file_internal_info));
4539 }
4540 
smb2_get_info_file_pipe(struct ksmbd_session * sess,struct smb2_query_info_req * req,struct smb2_query_info_rsp * rsp,void * rsp_org)4541 static int smb2_get_info_file_pipe(struct ksmbd_session *sess,
4542 				   struct smb2_query_info_req *req,
4543 				   struct smb2_query_info_rsp *rsp,
4544 				   void *rsp_org)
4545 {
4546 	u64 id;
4547 	int rc;
4548 
4549 	/*
4550 	 * Windows can sometime send query file info request on
4551 	 * pipe without opening it, checking error condition here
4552 	 */
4553 	id = req->VolatileFileId;
4554 	if (!ksmbd_session_rpc_method(sess, id))
4555 		return -ENOENT;
4556 
4557 	ksmbd_debug(SMB, "FileInfoClass %u, FileId 0x%llx\n",
4558 		    req->FileInfoClass, req->VolatileFileId);
4559 
4560 	switch (req->FileInfoClass) {
4561 	case FILE_STANDARD_INFORMATION:
4562 		get_standard_info_pipe(rsp, rsp_org);
4563 		rc = buffer_check_err(le32_to_cpu(req->OutputBufferLength),
4564 				      rsp, rsp_org);
4565 		break;
4566 	case FILE_INTERNAL_INFORMATION:
4567 		get_internal_info_pipe(rsp, id, rsp_org);
4568 		rc = buffer_check_err(le32_to_cpu(req->OutputBufferLength),
4569 				      rsp, rsp_org);
4570 		break;
4571 	default:
4572 		ksmbd_debug(SMB, "smb2_info_file_pipe for %u not supported\n",
4573 			    req->FileInfoClass);
4574 		rc = -EOPNOTSUPP;
4575 	}
4576 	return rc;
4577 }
4578 
4579 /**
4580  * smb2_get_ea() - handler for smb2 get extended attribute command
4581  * @work:	smb work containing query info command buffer
4582  * @fp:		ksmbd_file pointer
4583  * @req:	get extended attribute request
4584  * @rsp:	response buffer pointer
4585  * @rsp_org:	base response buffer pointer in case of chained response
4586  *
4587  * Return:	0 on success, otherwise error
4588  */
smb2_get_ea(struct ksmbd_work * work,struct ksmbd_file * fp,struct smb2_query_info_req * req,struct smb2_query_info_rsp * rsp,void * rsp_org)4589 static int smb2_get_ea(struct ksmbd_work *work, struct ksmbd_file *fp,
4590 		       struct smb2_query_info_req *req,
4591 		       struct smb2_query_info_rsp *rsp, void *rsp_org)
4592 {
4593 	struct smb2_ea_info *eainfo, *prev_eainfo;
4594 	char *name, *ptr, *xattr_list = NULL, *buf;
4595 	int rc, name_len, value_len, xattr_list_len, idx;
4596 	ssize_t buf_free_len, alignment_bytes, next_offset, rsp_data_cnt = 0;
4597 	struct smb2_ea_info_req *ea_req = NULL;
4598 	const struct path *path;
4599 	struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
4600 
4601 	if (!(fp->daccess & FILE_READ_EA_LE)) {
4602 		pr_err("Not permitted to read ext attr : 0x%x\n",
4603 		       fp->daccess);
4604 		return -EACCES;
4605 	}
4606 
4607 	path = &fp->filp->f_path;
4608 	/* single EA entry is requested with given user.* name */
4609 	if (req->InputBufferLength) {
4610 		if (le32_to_cpu(req->InputBufferLength) <=
4611 		    sizeof(struct smb2_ea_info_req))
4612 			return -EINVAL;
4613 
4614 		ea_req = (struct smb2_ea_info_req *)((char *)req +
4615 						     le16_to_cpu(req->InputBufferOffset));
4616 	} else {
4617 		/* need to send all EAs, if no specific EA is requested*/
4618 		if (le32_to_cpu(req->Flags) & SL_RETURN_SINGLE_ENTRY)
4619 			ksmbd_debug(SMB,
4620 				    "All EAs are requested but need to send single EA entry in rsp flags 0x%x\n",
4621 				    le32_to_cpu(req->Flags));
4622 	}
4623 
4624 	buf_free_len =
4625 		smb2_calc_max_out_buf_len(work, 8,
4626 					  le32_to_cpu(req->OutputBufferLength));
4627 	if (buf_free_len < 0)
4628 		return -EINVAL;
4629 
4630 	rc = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
4631 	if (rc < 0) {
4632 		rsp->hdr.Status = STATUS_INVALID_HANDLE;
4633 		goto out;
4634 	} else if (!rc) { /* there is no EA in the file */
4635 		ksmbd_debug(SMB, "no ea data in the file\n");
4636 		goto done;
4637 	}
4638 	xattr_list_len = rc;
4639 
4640 	ptr = (char *)rsp->Buffer;
4641 	eainfo = (struct smb2_ea_info *)ptr;
4642 	prev_eainfo = eainfo;
4643 	idx = 0;
4644 
4645 	while (idx < xattr_list_len) {
4646 		name = xattr_list + idx;
4647 		name_len = strlen(name);
4648 
4649 		ksmbd_debug(SMB, "%s, len %d\n", name, name_len);
4650 		idx += name_len + 1;
4651 
4652 		/*
4653 		 * CIFS does not support EA other than user.* namespace,
4654 		 * still keep the framework generic, to list other attrs
4655 		 * in future.
4656 		 */
4657 		if (strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
4658 			continue;
4659 
4660 		if (!strncmp(&name[XATTR_USER_PREFIX_LEN], STREAM_PREFIX,
4661 			     STREAM_PREFIX_LEN))
4662 			continue;
4663 
4664 		if (req->InputBufferLength &&
4665 		    strncmp(&name[XATTR_USER_PREFIX_LEN], ea_req->name,
4666 			    ea_req->EaNameLength))
4667 			continue;
4668 
4669 		if (!strncmp(&name[XATTR_USER_PREFIX_LEN],
4670 			     DOS_ATTRIBUTE_PREFIX, DOS_ATTRIBUTE_PREFIX_LEN))
4671 			continue;
4672 
4673 		if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
4674 			name_len -= XATTR_USER_PREFIX_LEN;
4675 
4676 		ptr = eainfo->name + name_len + 1;
4677 		buf_free_len -= (offsetof(struct smb2_ea_info, name) +
4678 				name_len + 1);
4679 		/* bailout if xattr can't fit in buf_free_len */
4680 		value_len = ksmbd_vfs_getxattr(idmap, path->dentry,
4681 					       name, &buf);
4682 		if (value_len <= 0) {
4683 			rc = -ENOENT;
4684 			rsp->hdr.Status = STATUS_INVALID_HANDLE;
4685 			goto out;
4686 		}
4687 
4688 		buf_free_len -= value_len;
4689 		if (buf_free_len < 0) {
4690 			kfree(buf);
4691 			break;
4692 		}
4693 
4694 		memcpy(ptr, buf, value_len);
4695 		kfree(buf);
4696 
4697 		ptr += value_len;
4698 		eainfo->Flags = 0;
4699 		eainfo->EaNameLength = name_len;
4700 
4701 		if (!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN))
4702 			memcpy(eainfo->name, &name[XATTR_USER_PREFIX_LEN],
4703 			       name_len);
4704 		else
4705 			memcpy(eainfo->name, name, name_len);
4706 
4707 		eainfo->name[name_len] = '\0';
4708 		eainfo->EaValueLength = cpu_to_le16(value_len);
4709 		next_offset = offsetof(struct smb2_ea_info, name) +
4710 			name_len + 1 + value_len;
4711 
4712 		/* align next xattr entry at 4 byte bundary */
4713 		alignment_bytes = ((next_offset + 3) & ~3) - next_offset;
4714 		if (alignment_bytes) {
4715 			memset(ptr, '\0', alignment_bytes);
4716 			ptr += alignment_bytes;
4717 			next_offset += alignment_bytes;
4718 			buf_free_len -= alignment_bytes;
4719 		}
4720 		eainfo->NextEntryOffset = cpu_to_le32(next_offset);
4721 		prev_eainfo = eainfo;
4722 		eainfo = (struct smb2_ea_info *)ptr;
4723 		rsp_data_cnt += next_offset;
4724 
4725 		if (req->InputBufferLength) {
4726 			ksmbd_debug(SMB, "single entry requested\n");
4727 			break;
4728 		}
4729 	}
4730 
4731 	/* no more ea entries */
4732 	prev_eainfo->NextEntryOffset = 0;
4733 done:
4734 	rc = 0;
4735 	if (rsp_data_cnt == 0)
4736 		rsp->hdr.Status = STATUS_NO_EAS_ON_FILE;
4737 	rsp->OutputBufferLength = cpu_to_le32(rsp_data_cnt);
4738 out:
4739 	kvfree(xattr_list);
4740 	return rc;
4741 }
4742 
get_file_access_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)4743 static void get_file_access_info(struct smb2_query_info_rsp *rsp,
4744 				 struct ksmbd_file *fp, void *rsp_org)
4745 {
4746 	struct smb2_file_access_info *file_info;
4747 
4748 	file_info = (struct smb2_file_access_info *)rsp->Buffer;
4749 	file_info->AccessFlags = fp->daccess;
4750 	rsp->OutputBufferLength =
4751 		cpu_to_le32(sizeof(struct smb2_file_access_info));
4752 }
4753 
get_file_basic_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)4754 static int get_file_basic_info(struct smb2_query_info_rsp *rsp,
4755 			       struct ksmbd_file *fp, void *rsp_org)
4756 {
4757 	struct smb2_file_basic_info *basic_info;
4758 	struct kstat stat;
4759 	u64 time;
4760 	int ret;
4761 
4762 	if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
4763 		pr_err("no right to read the attributes : 0x%x\n",
4764 		       fp->daccess);
4765 		return -EACCES;
4766 	}
4767 
4768 	ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
4769 			  AT_STATX_SYNC_AS_STAT);
4770 	if (ret)
4771 		return ret;
4772 
4773 	basic_info = (struct smb2_file_basic_info *)rsp->Buffer;
4774 	basic_info->CreationTime = cpu_to_le64(fp->create_time);
4775 	time = ksmbd_UnixTimeToNT(stat.atime);
4776 	basic_info->LastAccessTime = cpu_to_le64(time);
4777 	time = ksmbd_UnixTimeToNT(stat.mtime);
4778 	basic_info->LastWriteTime = cpu_to_le64(time);
4779 	time = ksmbd_UnixTimeToNT(stat.ctime);
4780 	basic_info->ChangeTime = cpu_to_le64(time);
4781 	basic_info->Attributes = fp->f_ci->m_fattr;
4782 	basic_info->Pad1 = 0;
4783 	rsp->OutputBufferLength =
4784 		cpu_to_le32(sizeof(struct smb2_file_basic_info));
4785 	return 0;
4786 }
4787 
get_file_standard_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)4788 static int get_file_standard_info(struct smb2_query_info_rsp *rsp,
4789 				  struct ksmbd_file *fp, void *rsp_org)
4790 {
4791 	struct smb2_file_standard_info *sinfo;
4792 	unsigned int delete_pending;
4793 	struct kstat stat;
4794 	int ret;
4795 
4796 	ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
4797 			  AT_STATX_SYNC_AS_STAT);
4798 	if (ret)
4799 		return ret;
4800 
4801 	sinfo = (struct smb2_file_standard_info *)rsp->Buffer;
4802 	delete_pending = ksmbd_inode_pending_delete(fp);
4803 
4804 	sinfo->AllocationSize = cpu_to_le64(stat.blocks << 9);
4805 	sinfo->EndOfFile = S_ISDIR(stat.mode) ? 0 : cpu_to_le64(stat.size);
4806 	sinfo->NumberOfLinks = cpu_to_le32(get_nlink(&stat) - delete_pending);
4807 	sinfo->DeletePending = delete_pending;
4808 	sinfo->Directory = S_ISDIR(stat.mode) ? 1 : 0;
4809 	rsp->OutputBufferLength =
4810 		cpu_to_le32(sizeof(struct smb2_file_standard_info));
4811 
4812 	return 0;
4813 }
4814 
get_file_alignment_info(struct smb2_query_info_rsp * rsp,void * rsp_org)4815 static void get_file_alignment_info(struct smb2_query_info_rsp *rsp,
4816 				    void *rsp_org)
4817 {
4818 	struct smb2_file_alignment_info *file_info;
4819 
4820 	file_info = (struct smb2_file_alignment_info *)rsp->Buffer;
4821 	file_info->AlignmentRequirement = 0;
4822 	rsp->OutputBufferLength =
4823 		cpu_to_le32(sizeof(struct smb2_file_alignment_info));
4824 }
4825 
get_file_all_info(struct ksmbd_work * work,struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)4826 static int get_file_all_info(struct ksmbd_work *work,
4827 			     struct smb2_query_info_rsp *rsp,
4828 			     struct ksmbd_file *fp,
4829 			     void *rsp_org)
4830 {
4831 	struct ksmbd_conn *conn = work->conn;
4832 	struct smb2_file_all_info *file_info;
4833 	unsigned int delete_pending;
4834 	struct kstat stat;
4835 	int conv_len;
4836 	char *filename;
4837 	u64 time;
4838 	int ret;
4839 
4840 	if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
4841 		ksmbd_debug(SMB, "no right to read the attributes : 0x%x\n",
4842 			    fp->daccess);
4843 		return -EACCES;
4844 	}
4845 
4846 	filename = convert_to_nt_pathname(work->tcon->share_conf, &fp->filp->f_path);
4847 	if (IS_ERR(filename))
4848 		return PTR_ERR(filename);
4849 
4850 	ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
4851 			  AT_STATX_SYNC_AS_STAT);
4852 	if (ret)
4853 		return ret;
4854 
4855 	ksmbd_debug(SMB, "filename = %s\n", filename);
4856 	delete_pending = ksmbd_inode_pending_delete(fp);
4857 	file_info = (struct smb2_file_all_info *)rsp->Buffer;
4858 
4859 	file_info->CreationTime = cpu_to_le64(fp->create_time);
4860 	time = ksmbd_UnixTimeToNT(stat.atime);
4861 	file_info->LastAccessTime = cpu_to_le64(time);
4862 	time = ksmbd_UnixTimeToNT(stat.mtime);
4863 	file_info->LastWriteTime = cpu_to_le64(time);
4864 	time = ksmbd_UnixTimeToNT(stat.ctime);
4865 	file_info->ChangeTime = cpu_to_le64(time);
4866 	file_info->Attributes = fp->f_ci->m_fattr;
4867 	file_info->Pad1 = 0;
4868 	file_info->AllocationSize =
4869 		cpu_to_le64(stat.blocks << 9);
4870 	file_info->EndOfFile = S_ISDIR(stat.mode) ? 0 : cpu_to_le64(stat.size);
4871 	file_info->NumberOfLinks =
4872 			cpu_to_le32(get_nlink(&stat) - delete_pending);
4873 	file_info->DeletePending = delete_pending;
4874 	file_info->Directory = S_ISDIR(stat.mode) ? 1 : 0;
4875 	file_info->Pad2 = 0;
4876 	file_info->IndexNumber = cpu_to_le64(stat.ino);
4877 	file_info->EASize = 0;
4878 	file_info->AccessFlags = fp->daccess;
4879 	file_info->CurrentByteOffset = cpu_to_le64(fp->filp->f_pos);
4880 	file_info->Mode = fp->coption;
4881 	file_info->AlignmentRequirement = 0;
4882 	conv_len = smbConvertToUTF16((__le16 *)file_info->FileName, filename,
4883 				     PATH_MAX, conn->local_nls, 0);
4884 	conv_len *= 2;
4885 	file_info->FileNameLength = cpu_to_le32(conv_len);
4886 	rsp->OutputBufferLength =
4887 		cpu_to_le32(sizeof(struct smb2_file_all_info) + conv_len - 1);
4888 	kfree(filename);
4889 	return 0;
4890 }
4891 
get_file_alternate_info(struct ksmbd_work * work,struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)4892 static void get_file_alternate_info(struct ksmbd_work *work,
4893 				    struct smb2_query_info_rsp *rsp,
4894 				    struct ksmbd_file *fp,
4895 				    void *rsp_org)
4896 {
4897 	struct ksmbd_conn *conn = work->conn;
4898 	struct smb2_file_alt_name_info *file_info;
4899 	struct dentry *dentry = fp->filp->f_path.dentry;
4900 	int conv_len;
4901 
4902 	spin_lock(&dentry->d_lock);
4903 	file_info = (struct smb2_file_alt_name_info *)rsp->Buffer;
4904 	conv_len = ksmbd_extract_shortname(conn,
4905 					   dentry->d_name.name,
4906 					   file_info->FileName);
4907 	spin_unlock(&dentry->d_lock);
4908 	file_info->FileNameLength = cpu_to_le32(conv_len);
4909 	rsp->OutputBufferLength =
4910 		cpu_to_le32(struct_size(file_info, FileName, conv_len));
4911 }
4912 
get_file_stream_info(struct ksmbd_work * work,struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)4913 static int get_file_stream_info(struct ksmbd_work *work,
4914 				struct smb2_query_info_rsp *rsp,
4915 				struct ksmbd_file *fp,
4916 				void *rsp_org)
4917 {
4918 	struct ksmbd_conn *conn = work->conn;
4919 	struct smb2_file_stream_info *file_info;
4920 	char *stream_name, *xattr_list = NULL, *stream_buf;
4921 	struct kstat stat;
4922 	const struct path *path = &fp->filp->f_path;
4923 	ssize_t xattr_list_len;
4924 	int nbytes = 0, streamlen, stream_name_len, next, idx = 0;
4925 	int buf_free_len;
4926 	struct smb2_query_info_req *req = ksmbd_req_buf_next(work);
4927 	int ret;
4928 
4929 	ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
4930 			  AT_STATX_SYNC_AS_STAT);
4931 	if (ret)
4932 		return ret;
4933 
4934 	file_info = (struct smb2_file_stream_info *)rsp->Buffer;
4935 
4936 	buf_free_len =
4937 		smb2_calc_max_out_buf_len(work, 8,
4938 					  le32_to_cpu(req->OutputBufferLength));
4939 	if (buf_free_len < 0)
4940 		goto out;
4941 
4942 	xattr_list_len = ksmbd_vfs_listxattr(path->dentry, &xattr_list);
4943 	if (xattr_list_len < 0) {
4944 		goto out;
4945 	} else if (!xattr_list_len) {
4946 		ksmbd_debug(SMB, "empty xattr in the file\n");
4947 		goto out;
4948 	}
4949 
4950 	while (idx < xattr_list_len) {
4951 		stream_name = xattr_list + idx;
4952 		streamlen = strlen(stream_name);
4953 		idx += streamlen + 1;
4954 
4955 		ksmbd_debug(SMB, "%s, len %d\n", stream_name, streamlen);
4956 
4957 		if (strncmp(&stream_name[XATTR_USER_PREFIX_LEN],
4958 			    STREAM_PREFIX, STREAM_PREFIX_LEN))
4959 			continue;
4960 
4961 		stream_name_len = streamlen - (XATTR_USER_PREFIX_LEN +
4962 				STREAM_PREFIX_LEN);
4963 		streamlen = stream_name_len;
4964 
4965 		/* plus : size */
4966 		streamlen += 1;
4967 		stream_buf = kmalloc(streamlen + 1, KSMBD_DEFAULT_GFP);
4968 		if (!stream_buf)
4969 			break;
4970 
4971 		streamlen = snprintf(stream_buf, streamlen + 1,
4972 				     ":%s", &stream_name[XATTR_NAME_STREAM_LEN]);
4973 
4974 		next = sizeof(struct smb2_file_stream_info) + streamlen * 2;
4975 		if (next > buf_free_len) {
4976 			kfree(stream_buf);
4977 			break;
4978 		}
4979 
4980 		file_info = (struct smb2_file_stream_info *)&rsp->Buffer[nbytes];
4981 		streamlen  = smbConvertToUTF16((__le16 *)file_info->StreamName,
4982 					       stream_buf, streamlen,
4983 					       conn->local_nls, 0);
4984 		streamlen *= 2;
4985 		kfree(stream_buf);
4986 		file_info->StreamNameLength = cpu_to_le32(streamlen);
4987 		file_info->StreamSize = cpu_to_le64(stream_name_len);
4988 		file_info->StreamAllocationSize = cpu_to_le64(stream_name_len);
4989 
4990 		nbytes += next;
4991 		buf_free_len -= next;
4992 		file_info->NextEntryOffset = cpu_to_le32(next);
4993 	}
4994 
4995 out:
4996 	if (!S_ISDIR(stat.mode) &&
4997 	    buf_free_len >= sizeof(struct smb2_file_stream_info) + 7 * 2) {
4998 		file_info = (struct smb2_file_stream_info *)
4999 			&rsp->Buffer[nbytes];
5000 		streamlen = smbConvertToUTF16((__le16 *)file_info->StreamName,
5001 					      "::$DATA", 7, conn->local_nls, 0);
5002 		streamlen *= 2;
5003 		file_info->StreamNameLength = cpu_to_le32(streamlen);
5004 		file_info->StreamSize = cpu_to_le64(stat.size);
5005 		file_info->StreamAllocationSize = cpu_to_le64(stat.blocks << 9);
5006 		nbytes += sizeof(struct smb2_file_stream_info) + streamlen;
5007 	}
5008 
5009 	/* last entry offset should be 0 */
5010 	file_info->NextEntryOffset = 0;
5011 	kvfree(xattr_list);
5012 
5013 	rsp->OutputBufferLength = cpu_to_le32(nbytes);
5014 
5015 	return 0;
5016 }
5017 
get_file_internal_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)5018 static int get_file_internal_info(struct smb2_query_info_rsp *rsp,
5019 				  struct ksmbd_file *fp, void *rsp_org)
5020 {
5021 	struct smb2_file_internal_info *file_info;
5022 	struct kstat stat;
5023 	int ret;
5024 
5025 	ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
5026 			  AT_STATX_SYNC_AS_STAT);
5027 	if (ret)
5028 		return ret;
5029 
5030 	file_info = (struct smb2_file_internal_info *)rsp->Buffer;
5031 	file_info->IndexNumber = cpu_to_le64(stat.ino);
5032 	rsp->OutputBufferLength =
5033 		cpu_to_le32(sizeof(struct smb2_file_internal_info));
5034 
5035 	return 0;
5036 }
5037 
get_file_network_open_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)5038 static int get_file_network_open_info(struct smb2_query_info_rsp *rsp,
5039 				      struct ksmbd_file *fp, void *rsp_org)
5040 {
5041 	struct smb2_file_ntwrk_info *file_info;
5042 	struct kstat stat;
5043 	u64 time;
5044 	int ret;
5045 
5046 	if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
5047 		pr_err("no right to read the attributes : 0x%x\n",
5048 		       fp->daccess);
5049 		return -EACCES;
5050 	}
5051 
5052 	ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
5053 			  AT_STATX_SYNC_AS_STAT);
5054 	if (ret)
5055 		return ret;
5056 
5057 	file_info = (struct smb2_file_ntwrk_info *)rsp->Buffer;
5058 
5059 	file_info->CreationTime = cpu_to_le64(fp->create_time);
5060 	time = ksmbd_UnixTimeToNT(stat.atime);
5061 	file_info->LastAccessTime = cpu_to_le64(time);
5062 	time = ksmbd_UnixTimeToNT(stat.mtime);
5063 	file_info->LastWriteTime = cpu_to_le64(time);
5064 	time = ksmbd_UnixTimeToNT(stat.ctime);
5065 	file_info->ChangeTime = cpu_to_le64(time);
5066 	file_info->Attributes = fp->f_ci->m_fattr;
5067 	file_info->AllocationSize = cpu_to_le64(stat.blocks << 9);
5068 	file_info->EndOfFile = S_ISDIR(stat.mode) ? 0 : cpu_to_le64(stat.size);
5069 	file_info->Reserved = cpu_to_le32(0);
5070 	rsp->OutputBufferLength =
5071 		cpu_to_le32(sizeof(struct smb2_file_ntwrk_info));
5072 	return 0;
5073 }
5074 
get_file_ea_info(struct smb2_query_info_rsp * rsp,void * rsp_org)5075 static void get_file_ea_info(struct smb2_query_info_rsp *rsp, void *rsp_org)
5076 {
5077 	struct smb2_file_ea_info *file_info;
5078 
5079 	file_info = (struct smb2_file_ea_info *)rsp->Buffer;
5080 	file_info->EASize = 0;
5081 	rsp->OutputBufferLength =
5082 		cpu_to_le32(sizeof(struct smb2_file_ea_info));
5083 }
5084 
get_file_position_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)5085 static void get_file_position_info(struct smb2_query_info_rsp *rsp,
5086 				   struct ksmbd_file *fp, void *rsp_org)
5087 {
5088 	struct smb2_file_pos_info *file_info;
5089 
5090 	file_info = (struct smb2_file_pos_info *)rsp->Buffer;
5091 	file_info->CurrentByteOffset = cpu_to_le64(fp->filp->f_pos);
5092 	rsp->OutputBufferLength =
5093 		cpu_to_le32(sizeof(struct smb2_file_pos_info));
5094 }
5095 
get_file_mode_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)5096 static void get_file_mode_info(struct smb2_query_info_rsp *rsp,
5097 			       struct ksmbd_file *fp, void *rsp_org)
5098 {
5099 	struct smb2_file_mode_info *file_info;
5100 
5101 	file_info = (struct smb2_file_mode_info *)rsp->Buffer;
5102 	file_info->Mode = fp->coption & FILE_MODE_INFO_MASK;
5103 	rsp->OutputBufferLength =
5104 		cpu_to_le32(sizeof(struct smb2_file_mode_info));
5105 }
5106 
get_file_compression_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)5107 static int get_file_compression_info(struct smb2_query_info_rsp *rsp,
5108 				     struct ksmbd_file *fp, void *rsp_org)
5109 {
5110 	struct smb2_file_comp_info *file_info;
5111 	struct kstat stat;
5112 	int ret;
5113 
5114 	ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
5115 			  AT_STATX_SYNC_AS_STAT);
5116 	if (ret)
5117 		return ret;
5118 
5119 	file_info = (struct smb2_file_comp_info *)rsp->Buffer;
5120 	file_info->CompressedFileSize = cpu_to_le64(stat.blocks << 9);
5121 	file_info->CompressionFormat = COMPRESSION_FORMAT_NONE;
5122 	file_info->CompressionUnitShift = 0;
5123 	file_info->ChunkShift = 0;
5124 	file_info->ClusterShift = 0;
5125 	memset(&file_info->Reserved[0], 0, 3);
5126 
5127 	rsp->OutputBufferLength =
5128 		cpu_to_le32(sizeof(struct smb2_file_comp_info));
5129 
5130 	return 0;
5131 }
5132 
get_file_attribute_tag_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)5133 static int get_file_attribute_tag_info(struct smb2_query_info_rsp *rsp,
5134 				       struct ksmbd_file *fp, void *rsp_org)
5135 {
5136 	struct smb2_file_attr_tag_info *file_info;
5137 
5138 	if (!(fp->daccess & FILE_READ_ATTRIBUTES_LE)) {
5139 		pr_err("no right to read the attributes : 0x%x\n",
5140 		       fp->daccess);
5141 		return -EACCES;
5142 	}
5143 
5144 	file_info = (struct smb2_file_attr_tag_info *)rsp->Buffer;
5145 	file_info->FileAttributes = fp->f_ci->m_fattr;
5146 	file_info->ReparseTag = 0;
5147 	rsp->OutputBufferLength =
5148 		cpu_to_le32(sizeof(struct smb2_file_attr_tag_info));
5149 	return 0;
5150 }
5151 
find_file_posix_info(struct smb2_query_info_rsp * rsp,struct ksmbd_file * fp,void * rsp_org)5152 static int find_file_posix_info(struct smb2_query_info_rsp *rsp,
5153 				struct ksmbd_file *fp, void *rsp_org)
5154 {
5155 	struct smb311_posix_qinfo *file_info;
5156 	struct inode *inode = file_inode(fp->filp);
5157 	struct mnt_idmap *idmap = file_mnt_idmap(fp->filp);
5158 	vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
5159 	vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
5160 	struct kstat stat;
5161 	u64 time;
5162 	int out_buf_len = sizeof(struct smb311_posix_qinfo) + 32;
5163 	int ret;
5164 
5165 	ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
5166 			  AT_STATX_SYNC_AS_STAT);
5167 	if (ret)
5168 		return ret;
5169 
5170 	file_info = (struct smb311_posix_qinfo *)rsp->Buffer;
5171 	file_info->CreationTime = cpu_to_le64(fp->create_time);
5172 	time = ksmbd_UnixTimeToNT(stat.atime);
5173 	file_info->LastAccessTime = cpu_to_le64(time);
5174 	time = ksmbd_UnixTimeToNT(stat.mtime);
5175 	file_info->LastWriteTime = cpu_to_le64(time);
5176 	time = ksmbd_UnixTimeToNT(stat.ctime);
5177 	file_info->ChangeTime = cpu_to_le64(time);
5178 	file_info->DosAttributes = fp->f_ci->m_fattr;
5179 	file_info->Inode = cpu_to_le64(stat.ino);
5180 	file_info->EndOfFile = cpu_to_le64(stat.size);
5181 	file_info->AllocationSize = cpu_to_le64(stat.blocks << 9);
5182 	file_info->HardLinks = cpu_to_le32(stat.nlink);
5183 	file_info->Mode = cpu_to_le32(stat.mode & 0777);
5184 	file_info->DeviceId = cpu_to_le32(stat.rdev);
5185 
5186 	/*
5187 	 * Sids(32) contain two sids(Domain sid(16), UNIX group sid(16)).
5188 	 * UNIX sid(16) = revision(1) + num_subauth(1) + authority(6) +
5189 	 *		  sub_auth(4 * 1(num_subauth)) + RID(4).
5190 	 */
5191 	id_to_sid(from_kuid_munged(&init_user_ns, vfsuid_into_kuid(vfsuid)),
5192 		  SIDUNIX_USER, (struct smb_sid *)&file_info->Sids[0]);
5193 	id_to_sid(from_kgid_munged(&init_user_ns, vfsgid_into_kgid(vfsgid)),
5194 		  SIDUNIX_GROUP, (struct smb_sid *)&file_info->Sids[16]);
5195 
5196 	rsp->OutputBufferLength = cpu_to_le32(out_buf_len);
5197 
5198 	return 0;
5199 }
5200 
smb2_get_info_file(struct ksmbd_work * work,struct smb2_query_info_req * req,struct smb2_query_info_rsp * rsp)5201 static int smb2_get_info_file(struct ksmbd_work *work,
5202 			      struct smb2_query_info_req *req,
5203 			      struct smb2_query_info_rsp *rsp)
5204 {
5205 	struct ksmbd_file *fp;
5206 	int fileinfoclass = 0;
5207 	int rc = 0;
5208 	unsigned int id = KSMBD_NO_FID, pid = KSMBD_NO_FID;
5209 
5210 	if (test_share_config_flag(work->tcon->share_conf,
5211 				   KSMBD_SHARE_FLAG_PIPE)) {
5212 		/* smb2 info file called for pipe */
5213 		return smb2_get_info_file_pipe(work->sess, req, rsp,
5214 					       work->response_buf);
5215 	}
5216 
5217 	if (work->next_smb2_rcv_hdr_off) {
5218 		if (!has_file_id(req->VolatileFileId)) {
5219 			ksmbd_debug(SMB, "Compound request set FID = %llu\n",
5220 				    work->compound_fid);
5221 			id = work->compound_fid;
5222 			pid = work->compound_pfid;
5223 		}
5224 	}
5225 
5226 	if (!has_file_id(id)) {
5227 		id = req->VolatileFileId;
5228 		pid = req->PersistentFileId;
5229 	}
5230 
5231 	fp = ksmbd_lookup_fd_slow(work, id, pid);
5232 	if (!fp)
5233 		return -ENOENT;
5234 
5235 	fileinfoclass = req->FileInfoClass;
5236 
5237 	switch (fileinfoclass) {
5238 	case FILE_ACCESS_INFORMATION:
5239 		get_file_access_info(rsp, fp, work->response_buf);
5240 		break;
5241 
5242 	case FILE_BASIC_INFORMATION:
5243 		rc = get_file_basic_info(rsp, fp, work->response_buf);
5244 		break;
5245 
5246 	case FILE_STANDARD_INFORMATION:
5247 		rc = get_file_standard_info(rsp, fp, work->response_buf);
5248 		break;
5249 
5250 	case FILE_ALIGNMENT_INFORMATION:
5251 		get_file_alignment_info(rsp, work->response_buf);
5252 		break;
5253 
5254 	case FILE_ALL_INFORMATION:
5255 		rc = get_file_all_info(work, rsp, fp, work->response_buf);
5256 		break;
5257 
5258 	case FILE_ALTERNATE_NAME_INFORMATION:
5259 		get_file_alternate_info(work, rsp, fp, work->response_buf);
5260 		break;
5261 
5262 	case FILE_STREAM_INFORMATION:
5263 		rc = get_file_stream_info(work, rsp, fp, work->response_buf);
5264 		break;
5265 
5266 	case FILE_INTERNAL_INFORMATION:
5267 		rc = get_file_internal_info(rsp, fp, work->response_buf);
5268 		break;
5269 
5270 	case FILE_NETWORK_OPEN_INFORMATION:
5271 		rc = get_file_network_open_info(rsp, fp, work->response_buf);
5272 		break;
5273 
5274 	case FILE_EA_INFORMATION:
5275 		get_file_ea_info(rsp, work->response_buf);
5276 		break;
5277 
5278 	case FILE_FULL_EA_INFORMATION:
5279 		rc = smb2_get_ea(work, fp, req, rsp, work->response_buf);
5280 		break;
5281 
5282 	case FILE_POSITION_INFORMATION:
5283 		get_file_position_info(rsp, fp, work->response_buf);
5284 		break;
5285 
5286 	case FILE_MODE_INFORMATION:
5287 		get_file_mode_info(rsp, fp, work->response_buf);
5288 		break;
5289 
5290 	case FILE_COMPRESSION_INFORMATION:
5291 		rc = get_file_compression_info(rsp, fp, work->response_buf);
5292 		break;
5293 
5294 	case FILE_ATTRIBUTE_TAG_INFORMATION:
5295 		rc = get_file_attribute_tag_info(rsp, fp, work->response_buf);
5296 		break;
5297 	case SMB_FIND_FILE_POSIX_INFO:
5298 		if (!work->tcon->posix_extensions) {
5299 			pr_err("client doesn't negotiate with SMB3.1.1 POSIX Extensions\n");
5300 			rc = -EOPNOTSUPP;
5301 		} else {
5302 			rc = find_file_posix_info(rsp, fp, work->response_buf);
5303 		}
5304 		break;
5305 	default:
5306 		ksmbd_debug(SMB, "fileinfoclass %d not supported yet\n",
5307 			    fileinfoclass);
5308 		rc = -EOPNOTSUPP;
5309 	}
5310 	if (!rc)
5311 		rc = buffer_check_err(le32_to_cpu(req->OutputBufferLength),
5312 				      rsp, work->response_buf);
5313 	ksmbd_fd_put(work, fp);
5314 	return rc;
5315 }
5316 
smb2_get_info_filesystem(struct ksmbd_work * work,struct smb2_query_info_req * req,struct smb2_query_info_rsp * rsp)5317 static int smb2_get_info_filesystem(struct ksmbd_work *work,
5318 				    struct smb2_query_info_req *req,
5319 				    struct smb2_query_info_rsp *rsp)
5320 {
5321 	struct ksmbd_session *sess = work->sess;
5322 	struct ksmbd_conn *conn = work->conn;
5323 	struct ksmbd_share_config *share = work->tcon->share_conf;
5324 	int fsinfoclass = 0;
5325 	struct kstatfs stfs;
5326 	struct path path;
5327 	int rc = 0, len;
5328 
5329 	if (!share->path)
5330 		return -EIO;
5331 
5332 	rc = kern_path(share->path, LOOKUP_NO_SYMLINKS, &path);
5333 	if (rc) {
5334 		pr_err("cannot create vfs path\n");
5335 		return -EIO;
5336 	}
5337 
5338 	rc = vfs_statfs(&path, &stfs);
5339 	if (rc) {
5340 		pr_err("cannot do stat of path %s\n", share->path);
5341 		path_put(&path);
5342 		return -EIO;
5343 	}
5344 
5345 	fsinfoclass = req->FileInfoClass;
5346 
5347 	switch (fsinfoclass) {
5348 	case FS_DEVICE_INFORMATION:
5349 	{
5350 		struct filesystem_device_info *info;
5351 
5352 		info = (struct filesystem_device_info *)rsp->Buffer;
5353 
5354 		info->DeviceType = cpu_to_le32(FILE_DEVICE_DISK);
5355 		info->DeviceCharacteristics =
5356 			cpu_to_le32(FILE_DEVICE_IS_MOUNTED);
5357 		if (!test_tree_conn_flag(work->tcon,
5358 					 KSMBD_TREE_CONN_FLAG_WRITABLE))
5359 			info->DeviceCharacteristics |=
5360 				cpu_to_le32(FILE_READ_ONLY_DEVICE);
5361 		rsp->OutputBufferLength = cpu_to_le32(8);
5362 		break;
5363 	}
5364 	case FS_ATTRIBUTE_INFORMATION:
5365 	{
5366 		struct filesystem_attribute_info *info;
5367 		size_t sz;
5368 
5369 		info = (struct filesystem_attribute_info *)rsp->Buffer;
5370 		info->Attributes = cpu_to_le32(FILE_SUPPORTS_OBJECT_IDS |
5371 					       FILE_PERSISTENT_ACLS |
5372 					       FILE_UNICODE_ON_DISK |
5373 					       FILE_CASE_PRESERVED_NAMES |
5374 					       FILE_CASE_SENSITIVE_SEARCH |
5375 					       FILE_SUPPORTS_BLOCK_REFCOUNTING);
5376 
5377 		info->Attributes |= cpu_to_le32(server_conf.share_fake_fscaps);
5378 
5379 		if (test_share_config_flag(work->tcon->share_conf,
5380 		    KSMBD_SHARE_FLAG_STREAMS))
5381 			info->Attributes |= cpu_to_le32(FILE_NAMED_STREAMS);
5382 
5383 		info->MaxPathNameComponentLength = cpu_to_le32(stfs.f_namelen);
5384 		len = smbConvertToUTF16((__le16 *)info->FileSystemName,
5385 					"NTFS", PATH_MAX, conn->local_nls, 0);
5386 		len = len * 2;
5387 		info->FileSystemNameLen = cpu_to_le32(len);
5388 		sz = sizeof(struct filesystem_attribute_info) + len;
5389 		rsp->OutputBufferLength = cpu_to_le32(sz);
5390 		break;
5391 	}
5392 	case FS_VOLUME_INFORMATION:
5393 	{
5394 		struct filesystem_vol_info *info;
5395 		size_t sz;
5396 		unsigned int serial_crc = 0;
5397 
5398 		info = (struct filesystem_vol_info *)(rsp->Buffer);
5399 		info->VolumeCreationTime = 0;
5400 		serial_crc = crc32_le(serial_crc, share->name,
5401 				      strlen(share->name));
5402 		serial_crc = crc32_le(serial_crc, share->path,
5403 				      strlen(share->path));
5404 		serial_crc = crc32_le(serial_crc, ksmbd_netbios_name(),
5405 				      strlen(ksmbd_netbios_name()));
5406 		/* Taking dummy value of serial number*/
5407 		info->SerialNumber = cpu_to_le32(serial_crc);
5408 		len = smbConvertToUTF16((__le16 *)info->VolumeLabel,
5409 					share->name, PATH_MAX,
5410 					conn->local_nls, 0);
5411 		len = len * 2;
5412 		info->VolumeLabelSize = cpu_to_le32(len);
5413 		info->Reserved = 0;
5414 		sz = sizeof(struct filesystem_vol_info) + len;
5415 		rsp->OutputBufferLength = cpu_to_le32(sz);
5416 		break;
5417 	}
5418 	case FS_SIZE_INFORMATION:
5419 	{
5420 		struct filesystem_info *info;
5421 
5422 		info = (struct filesystem_info *)(rsp->Buffer);
5423 		info->TotalAllocationUnits = cpu_to_le64(stfs.f_blocks);
5424 		info->FreeAllocationUnits = cpu_to_le64(stfs.f_bfree);
5425 		info->SectorsPerAllocationUnit = cpu_to_le32(1);
5426 		info->BytesPerSector = cpu_to_le32(stfs.f_bsize);
5427 		rsp->OutputBufferLength = cpu_to_le32(24);
5428 		break;
5429 	}
5430 	case FS_FULL_SIZE_INFORMATION:
5431 	{
5432 		struct smb2_fs_full_size_info *info;
5433 
5434 		info = (struct smb2_fs_full_size_info *)(rsp->Buffer);
5435 		info->TotalAllocationUnits = cpu_to_le64(stfs.f_blocks);
5436 		info->CallerAvailableAllocationUnits =
5437 					cpu_to_le64(stfs.f_bavail);
5438 		info->ActualAvailableAllocationUnits =
5439 					cpu_to_le64(stfs.f_bfree);
5440 		info->SectorsPerAllocationUnit = cpu_to_le32(1);
5441 		info->BytesPerSector = cpu_to_le32(stfs.f_bsize);
5442 		rsp->OutputBufferLength = cpu_to_le32(32);
5443 		break;
5444 	}
5445 	case FS_OBJECT_ID_INFORMATION:
5446 	{
5447 		struct object_id_info *info;
5448 
5449 		info = (struct object_id_info *)(rsp->Buffer);
5450 
5451 		if (!user_guest(sess->user))
5452 			memcpy(info->objid, user_passkey(sess->user), 16);
5453 		else
5454 			memset(info->objid, 0, 16);
5455 
5456 		info->extended_info.magic = cpu_to_le32(EXTENDED_INFO_MAGIC);
5457 		info->extended_info.version = cpu_to_le32(1);
5458 		info->extended_info.release = cpu_to_le32(1);
5459 		info->extended_info.rel_date = 0;
5460 		memcpy(info->extended_info.version_string, "1.1.0", strlen("1.1.0"));
5461 		rsp->OutputBufferLength = cpu_to_le32(64);
5462 		break;
5463 	}
5464 	case FS_SECTOR_SIZE_INFORMATION:
5465 	{
5466 		struct smb3_fs_ss_info *info;
5467 		unsigned int sector_size =
5468 			min_t(unsigned int, path.mnt->mnt_sb->s_blocksize, 4096);
5469 
5470 		info = (struct smb3_fs_ss_info *)(rsp->Buffer);
5471 
5472 		info->LogicalBytesPerSector = cpu_to_le32(sector_size);
5473 		info->PhysicalBytesPerSectorForAtomicity =
5474 				cpu_to_le32(sector_size);
5475 		info->PhysicalBytesPerSectorForPerf = cpu_to_le32(sector_size);
5476 		info->FSEffPhysicalBytesPerSectorForAtomicity =
5477 				cpu_to_le32(sector_size);
5478 		info->Flags = cpu_to_le32(SSINFO_FLAGS_ALIGNED_DEVICE |
5479 				    SSINFO_FLAGS_PARTITION_ALIGNED_ON_DEVICE);
5480 		info->ByteOffsetForSectorAlignment = 0;
5481 		info->ByteOffsetForPartitionAlignment = 0;
5482 		rsp->OutputBufferLength = cpu_to_le32(28);
5483 		break;
5484 	}
5485 	case FS_CONTROL_INFORMATION:
5486 	{
5487 		/*
5488 		 * TODO : The current implementation is based on
5489 		 * test result with win7(NTFS) server. It's need to
5490 		 * modify this to get valid Quota values
5491 		 * from Linux kernel
5492 		 */
5493 		struct smb2_fs_control_info *info;
5494 
5495 		info = (struct smb2_fs_control_info *)(rsp->Buffer);
5496 		info->FreeSpaceStartFiltering = 0;
5497 		info->FreeSpaceThreshold = 0;
5498 		info->FreeSpaceStopFiltering = 0;
5499 		info->DefaultQuotaThreshold = cpu_to_le64(SMB2_NO_FID);
5500 		info->DefaultQuotaLimit = cpu_to_le64(SMB2_NO_FID);
5501 		info->Padding = 0;
5502 		rsp->OutputBufferLength = cpu_to_le32(48);
5503 		break;
5504 	}
5505 	case FS_POSIX_INFORMATION:
5506 	{
5507 		struct filesystem_posix_info *info;
5508 
5509 		if (!work->tcon->posix_extensions) {
5510 			pr_err("client doesn't negotiate with SMB3.1.1 POSIX Extensions\n");
5511 			rc = -EOPNOTSUPP;
5512 		} else {
5513 			info = (struct filesystem_posix_info *)(rsp->Buffer);
5514 			info->OptimalTransferSize = cpu_to_le32(stfs.f_bsize);
5515 			info->BlockSize = cpu_to_le32(stfs.f_bsize);
5516 			info->TotalBlocks = cpu_to_le64(stfs.f_blocks);
5517 			info->BlocksAvail = cpu_to_le64(stfs.f_bfree);
5518 			info->UserBlocksAvail = cpu_to_le64(stfs.f_bavail);
5519 			info->TotalFileNodes = cpu_to_le64(stfs.f_files);
5520 			info->FreeFileNodes = cpu_to_le64(stfs.f_ffree);
5521 			rsp->OutputBufferLength = cpu_to_le32(56);
5522 		}
5523 		break;
5524 	}
5525 	default:
5526 		path_put(&path);
5527 		return -EOPNOTSUPP;
5528 	}
5529 	rc = buffer_check_err(le32_to_cpu(req->OutputBufferLength),
5530 			      rsp, work->response_buf);
5531 	path_put(&path);
5532 	return rc;
5533 }
5534 
smb2_get_info_sec(struct ksmbd_work * work,struct smb2_query_info_req * req,struct smb2_query_info_rsp * rsp)5535 static int smb2_get_info_sec(struct ksmbd_work *work,
5536 			     struct smb2_query_info_req *req,
5537 			     struct smb2_query_info_rsp *rsp)
5538 {
5539 	struct ksmbd_file *fp;
5540 	struct mnt_idmap *idmap;
5541 	struct smb_ntsd *pntsd = (struct smb_ntsd *)rsp->Buffer, *ppntsd = NULL;
5542 	struct smb_fattr fattr = {{0}};
5543 	struct inode *inode;
5544 	__u32 secdesclen = 0;
5545 	unsigned int id = KSMBD_NO_FID, pid = KSMBD_NO_FID;
5546 	int addition_info = le32_to_cpu(req->AdditionalInformation);
5547 	int rc = 0, ppntsd_size = 0;
5548 
5549 	if (addition_info & ~(OWNER_SECINFO | GROUP_SECINFO | DACL_SECINFO |
5550 			      PROTECTED_DACL_SECINFO |
5551 			      UNPROTECTED_DACL_SECINFO)) {
5552 		ksmbd_debug(SMB, "Unsupported addition info: 0x%x)\n",
5553 		       addition_info);
5554 
5555 		pntsd->revision = cpu_to_le16(1);
5556 		pntsd->type = cpu_to_le16(SELF_RELATIVE | DACL_PROTECTED);
5557 		pntsd->osidoffset = 0;
5558 		pntsd->gsidoffset = 0;
5559 		pntsd->sacloffset = 0;
5560 		pntsd->dacloffset = 0;
5561 
5562 		secdesclen = sizeof(struct smb_ntsd);
5563 		rsp->OutputBufferLength = cpu_to_le32(secdesclen);
5564 
5565 		return 0;
5566 	}
5567 
5568 	if (work->next_smb2_rcv_hdr_off) {
5569 		if (!has_file_id(req->VolatileFileId)) {
5570 			ksmbd_debug(SMB, "Compound request set FID = %llu\n",
5571 				    work->compound_fid);
5572 			id = work->compound_fid;
5573 			pid = work->compound_pfid;
5574 		}
5575 	}
5576 
5577 	if (!has_file_id(id)) {
5578 		id = req->VolatileFileId;
5579 		pid = req->PersistentFileId;
5580 	}
5581 
5582 	fp = ksmbd_lookup_fd_slow(work, id, pid);
5583 	if (!fp)
5584 		return -ENOENT;
5585 
5586 	idmap = file_mnt_idmap(fp->filp);
5587 	inode = file_inode(fp->filp);
5588 	ksmbd_acls_fattr(&fattr, idmap, inode);
5589 
5590 	if (test_share_config_flag(work->tcon->share_conf,
5591 				   KSMBD_SHARE_FLAG_ACL_XATTR))
5592 		ppntsd_size = ksmbd_vfs_get_sd_xattr(work->conn, idmap,
5593 						     fp->filp->f_path.dentry,
5594 						     &ppntsd);
5595 
5596 	/* Check if sd buffer size exceeds response buffer size */
5597 	if (smb2_resp_buf_len(work, 8) > ppntsd_size)
5598 		rc = build_sec_desc(idmap, pntsd, ppntsd, ppntsd_size,
5599 				    addition_info, &secdesclen, &fattr);
5600 	posix_acl_release(fattr.cf_acls);
5601 	posix_acl_release(fattr.cf_dacls);
5602 	kfree(ppntsd);
5603 	ksmbd_fd_put(work, fp);
5604 	if (rc)
5605 		return rc;
5606 
5607 	rsp->OutputBufferLength = cpu_to_le32(secdesclen);
5608 	return 0;
5609 }
5610 
5611 /**
5612  * smb2_query_info() - handler for smb2 query info command
5613  * @work:	smb work containing query info request buffer
5614  *
5615  * Return:	0 on success, otherwise error
5616  */
smb2_query_info(struct ksmbd_work * work)5617 int smb2_query_info(struct ksmbd_work *work)
5618 {
5619 	struct smb2_query_info_req *req;
5620 	struct smb2_query_info_rsp *rsp;
5621 	int rc = 0;
5622 
5623 	ksmbd_debug(SMB, "Received request smb2 query info request\n");
5624 
5625 	WORK_BUFFERS(work, req, rsp);
5626 
5627 	if (ksmbd_override_fsids(work)) {
5628 		rc = -ENOMEM;
5629 		goto err_out;
5630 	}
5631 
5632 	switch (req->InfoType) {
5633 	case SMB2_O_INFO_FILE:
5634 		ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILE\n");
5635 		rc = smb2_get_info_file(work, req, rsp);
5636 		break;
5637 	case SMB2_O_INFO_FILESYSTEM:
5638 		ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILESYSTEM\n");
5639 		rc = smb2_get_info_filesystem(work, req, rsp);
5640 		break;
5641 	case SMB2_O_INFO_SECURITY:
5642 		ksmbd_debug(SMB, "GOT SMB2_O_INFO_SECURITY\n");
5643 		rc = smb2_get_info_sec(work, req, rsp);
5644 		break;
5645 	default:
5646 		ksmbd_debug(SMB, "InfoType %d not supported yet\n",
5647 			    req->InfoType);
5648 		rc = -EOPNOTSUPP;
5649 	}
5650 	ksmbd_revert_fsids(work);
5651 
5652 	if (!rc) {
5653 		rsp->StructureSize = cpu_to_le16(9);
5654 		rsp->OutputBufferOffset = cpu_to_le16(72);
5655 		rc = ksmbd_iov_pin_rsp(work, (void *)rsp,
5656 				       offsetof(struct smb2_query_info_rsp, Buffer) +
5657 					le32_to_cpu(rsp->OutputBufferLength));
5658 	}
5659 
5660 err_out:
5661 	if (rc < 0) {
5662 		if (rc == -EACCES)
5663 			rsp->hdr.Status = STATUS_ACCESS_DENIED;
5664 		else if (rc == -ENOENT)
5665 			rsp->hdr.Status = STATUS_FILE_CLOSED;
5666 		else if (rc == -EIO)
5667 			rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;
5668 		else if (rc == -ENOMEM)
5669 			rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
5670 		else if (rc == -EOPNOTSUPP || rsp->hdr.Status == 0)
5671 			rsp->hdr.Status = STATUS_INVALID_INFO_CLASS;
5672 		smb2_set_err_rsp(work);
5673 
5674 		ksmbd_debug(SMB, "error while processing smb2 query rc = %d\n",
5675 			    rc);
5676 		return rc;
5677 	}
5678 	return 0;
5679 }
5680 
5681 /**
5682  * smb2_close_pipe() - handler for closing IPC pipe
5683  * @work:	smb work containing close request buffer
5684  *
5685  * Return:	0
5686  */
smb2_close_pipe(struct ksmbd_work * work)5687 static noinline int smb2_close_pipe(struct ksmbd_work *work)
5688 {
5689 	u64 id;
5690 	struct smb2_close_req *req;
5691 	struct smb2_close_rsp *rsp;
5692 
5693 	WORK_BUFFERS(work, req, rsp);
5694 
5695 	id = req->VolatileFileId;
5696 	ksmbd_session_rpc_close(work->sess, id);
5697 
5698 	rsp->StructureSize = cpu_to_le16(60);
5699 	rsp->Flags = 0;
5700 	rsp->Reserved = 0;
5701 	rsp->CreationTime = 0;
5702 	rsp->LastAccessTime = 0;
5703 	rsp->LastWriteTime = 0;
5704 	rsp->ChangeTime = 0;
5705 	rsp->AllocationSize = 0;
5706 	rsp->EndOfFile = 0;
5707 	rsp->Attributes = 0;
5708 
5709 	return ksmbd_iov_pin_rsp(work, (void *)rsp,
5710 				 sizeof(struct smb2_close_rsp));
5711 }
5712 
5713 /**
5714  * smb2_close() - handler for smb2 close file command
5715  * @work:	smb work containing close request buffer
5716  *
5717  * Return:	0
5718  */
smb2_close(struct ksmbd_work * work)5719 int smb2_close(struct ksmbd_work *work)
5720 {
5721 	u64 volatile_id = KSMBD_NO_FID;
5722 	u64 sess_id;
5723 	struct smb2_close_req *req;
5724 	struct smb2_close_rsp *rsp;
5725 	struct ksmbd_conn *conn = work->conn;
5726 	struct ksmbd_file *fp;
5727 	u64 time;
5728 	int err = 0;
5729 
5730 	ksmbd_debug(SMB, "Received smb2 close request\n");
5731 
5732 	WORK_BUFFERS(work, req, rsp);
5733 
5734 	if (test_share_config_flag(work->tcon->share_conf,
5735 				   KSMBD_SHARE_FLAG_PIPE)) {
5736 		ksmbd_debug(SMB, "IPC pipe close request\n");
5737 		return smb2_close_pipe(work);
5738 	}
5739 
5740 	sess_id = le64_to_cpu(req->hdr.SessionId);
5741 	if (req->hdr.Flags & SMB2_FLAGS_RELATED_OPERATIONS)
5742 		sess_id = work->compound_sid;
5743 
5744 	work->compound_sid = 0;
5745 	if (check_session_id(conn, sess_id)) {
5746 		work->compound_sid = sess_id;
5747 	} else {
5748 		rsp->hdr.Status = STATUS_USER_SESSION_DELETED;
5749 		if (req->hdr.Flags & SMB2_FLAGS_RELATED_OPERATIONS)
5750 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
5751 		err = -EBADF;
5752 		goto out;
5753 	}
5754 
5755 	if (work->next_smb2_rcv_hdr_off &&
5756 	    !has_file_id(req->VolatileFileId)) {
5757 		if (!has_file_id(work->compound_fid)) {
5758 			/* file already closed, return FILE_CLOSED */
5759 			ksmbd_debug(SMB, "file already closed\n");
5760 			rsp->hdr.Status = STATUS_FILE_CLOSED;
5761 			err = -EBADF;
5762 			goto out;
5763 		} else {
5764 			ksmbd_debug(SMB,
5765 				    "Compound request set FID = %llu:%llu\n",
5766 				    work->compound_fid,
5767 				    work->compound_pfid);
5768 			volatile_id = work->compound_fid;
5769 
5770 			/* file closed, stored id is not valid anymore */
5771 			work->compound_fid = KSMBD_NO_FID;
5772 			work->compound_pfid = KSMBD_NO_FID;
5773 		}
5774 	} else {
5775 		volatile_id = req->VolatileFileId;
5776 	}
5777 	ksmbd_debug(SMB, "volatile_id = %llu\n", volatile_id);
5778 
5779 	rsp->StructureSize = cpu_to_le16(60);
5780 	rsp->Reserved = 0;
5781 
5782 	if (req->Flags == SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB) {
5783 		struct kstat stat;
5784 		int ret;
5785 
5786 		fp = ksmbd_lookup_fd_fast(work, volatile_id);
5787 		if (!fp) {
5788 			err = -ENOENT;
5789 			goto out;
5790 		}
5791 
5792 		ret = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
5793 				  AT_STATX_SYNC_AS_STAT);
5794 		if (ret) {
5795 			ksmbd_fd_put(work, fp);
5796 			goto out;
5797 		}
5798 
5799 		rsp->Flags = SMB2_CLOSE_FLAG_POSTQUERY_ATTRIB;
5800 		rsp->AllocationSize = S_ISDIR(stat.mode) ? 0 :
5801 			cpu_to_le64(stat.blocks << 9);
5802 		rsp->EndOfFile = cpu_to_le64(stat.size);
5803 		rsp->Attributes = fp->f_ci->m_fattr;
5804 		rsp->CreationTime = cpu_to_le64(fp->create_time);
5805 		time = ksmbd_UnixTimeToNT(stat.atime);
5806 		rsp->LastAccessTime = cpu_to_le64(time);
5807 		time = ksmbd_UnixTimeToNT(stat.mtime);
5808 		rsp->LastWriteTime = cpu_to_le64(time);
5809 		time = ksmbd_UnixTimeToNT(stat.ctime);
5810 		rsp->ChangeTime = cpu_to_le64(time);
5811 		ksmbd_fd_put(work, fp);
5812 	} else {
5813 		rsp->Flags = 0;
5814 		rsp->AllocationSize = 0;
5815 		rsp->EndOfFile = 0;
5816 		rsp->Attributes = 0;
5817 		rsp->CreationTime = 0;
5818 		rsp->LastAccessTime = 0;
5819 		rsp->LastWriteTime = 0;
5820 		rsp->ChangeTime = 0;
5821 	}
5822 
5823 	err = ksmbd_close_fd(work, volatile_id);
5824 out:
5825 	if (!err)
5826 		err = ksmbd_iov_pin_rsp(work, (void *)rsp,
5827 					sizeof(struct smb2_close_rsp));
5828 
5829 	if (err) {
5830 		if (rsp->hdr.Status == 0)
5831 			rsp->hdr.Status = STATUS_FILE_CLOSED;
5832 		smb2_set_err_rsp(work);
5833 	}
5834 
5835 	return err;
5836 }
5837 
5838 /**
5839  * smb2_echo() - handler for smb2 echo(ping) command
5840  * @work:	smb work containing echo request buffer
5841  *
5842  * Return:	0
5843  */
smb2_echo(struct ksmbd_work * work)5844 int smb2_echo(struct ksmbd_work *work)
5845 {
5846 	struct smb2_echo_rsp *rsp = smb2_get_msg(work->response_buf);
5847 
5848 	ksmbd_debug(SMB, "Received smb2 echo request\n");
5849 
5850 	if (work->next_smb2_rcv_hdr_off)
5851 		rsp = ksmbd_resp_buf_next(work);
5852 
5853 	rsp->StructureSize = cpu_to_le16(4);
5854 	rsp->Reserved = 0;
5855 	return ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_echo_rsp));
5856 }
5857 
smb2_rename(struct ksmbd_work * work,struct ksmbd_file * fp,struct smb2_file_rename_info * file_info,struct nls_table * local_nls)5858 static int smb2_rename(struct ksmbd_work *work,
5859 		       struct ksmbd_file *fp,
5860 		       struct smb2_file_rename_info *file_info,
5861 		       struct nls_table *local_nls)
5862 {
5863 	struct ksmbd_share_config *share = fp->tcon->share_conf;
5864 	char *new_name = NULL;
5865 	int rc, flags = 0;
5866 
5867 	ksmbd_debug(SMB, "setting FILE_RENAME_INFO\n");
5868 	new_name = smb2_get_name(file_info->FileName,
5869 				 le32_to_cpu(file_info->FileNameLength),
5870 				 local_nls);
5871 	if (IS_ERR(new_name))
5872 		return PTR_ERR(new_name);
5873 
5874 	if (strchr(new_name, ':')) {
5875 		int s_type;
5876 		char *xattr_stream_name, *stream_name = NULL;
5877 		size_t xattr_stream_size;
5878 		int len;
5879 
5880 		rc = parse_stream_name(new_name, &stream_name, &s_type);
5881 		if (rc < 0)
5882 			goto out;
5883 
5884 		len = strlen(new_name);
5885 		if (len > 0 && new_name[len - 1] != '/') {
5886 			pr_err("not allow base filename in rename\n");
5887 			rc = -ESHARE;
5888 			goto out;
5889 		}
5890 
5891 		rc = ksmbd_vfs_xattr_stream_name(stream_name,
5892 						 &xattr_stream_name,
5893 						 &xattr_stream_size,
5894 						 s_type);
5895 		if (rc)
5896 			goto out;
5897 
5898 		rc = ksmbd_vfs_setxattr(file_mnt_idmap(fp->filp),
5899 					&fp->filp->f_path,
5900 					xattr_stream_name,
5901 					NULL, 0, 0, true);
5902 		if (rc < 0) {
5903 			pr_err("failed to store stream name in xattr: %d\n",
5904 			       rc);
5905 			rc = -EINVAL;
5906 			goto out;
5907 		}
5908 
5909 		goto out;
5910 	}
5911 
5912 	ksmbd_debug(SMB, "new name %s\n", new_name);
5913 	if (ksmbd_share_veto_filename(share, new_name)) {
5914 		rc = -ENOENT;
5915 		ksmbd_debug(SMB, "Can't rename vetoed file: %s\n", new_name);
5916 		goto out;
5917 	}
5918 
5919 	if (!file_info->ReplaceIfExists)
5920 		flags = RENAME_NOREPLACE;
5921 
5922 	rc = ksmbd_vfs_rename(work, &fp->filp->f_path, new_name, flags);
5923 	if (!rc)
5924 		smb_break_all_levII_oplock(work, fp, 0);
5925 out:
5926 	kfree(new_name);
5927 	return rc;
5928 }
5929 
smb2_create_link(struct ksmbd_work * work,struct ksmbd_share_config * share,struct smb2_file_link_info * file_info,unsigned int buf_len,struct file * filp,struct nls_table * local_nls)5930 static int smb2_create_link(struct ksmbd_work *work,
5931 			    struct ksmbd_share_config *share,
5932 			    struct smb2_file_link_info *file_info,
5933 			    unsigned int buf_len, struct file *filp,
5934 			    struct nls_table *local_nls)
5935 {
5936 	char *link_name = NULL, *target_name = NULL, *pathname = NULL;
5937 	struct path path, parent_path;
5938 	bool file_present = false;
5939 	int rc;
5940 
5941 	if (buf_len < (u64)sizeof(struct smb2_file_link_info) +
5942 			le32_to_cpu(file_info->FileNameLength))
5943 		return -EINVAL;
5944 
5945 	ksmbd_debug(SMB, "setting FILE_LINK_INFORMATION\n");
5946 	pathname = kmalloc(PATH_MAX, KSMBD_DEFAULT_GFP);
5947 	if (!pathname)
5948 		return -ENOMEM;
5949 
5950 	link_name = smb2_get_name(file_info->FileName,
5951 				  le32_to_cpu(file_info->FileNameLength),
5952 				  local_nls);
5953 	if (IS_ERR(link_name) || S_ISDIR(file_inode(filp)->i_mode)) {
5954 		rc = -EINVAL;
5955 		goto out;
5956 	}
5957 
5958 	ksmbd_debug(SMB, "link name is %s\n", link_name);
5959 	target_name = file_path(filp, pathname, PATH_MAX);
5960 	if (IS_ERR(target_name)) {
5961 		rc = -EINVAL;
5962 		goto out;
5963 	}
5964 
5965 	ksmbd_debug(SMB, "target name is %s\n", target_name);
5966 	rc = ksmbd_vfs_kern_path_locked(work, link_name, LOOKUP_NO_SYMLINKS,
5967 					&parent_path, &path, 0);
5968 	if (rc) {
5969 		if (rc != -ENOENT)
5970 			goto out;
5971 	} else
5972 		file_present = true;
5973 
5974 	if (file_info->ReplaceIfExists) {
5975 		if (file_present) {
5976 			rc = ksmbd_vfs_remove_file(work, &path);
5977 			if (rc) {
5978 				rc = -EINVAL;
5979 				ksmbd_debug(SMB, "cannot delete %s\n",
5980 					    link_name);
5981 				goto out;
5982 			}
5983 		}
5984 	} else {
5985 		if (file_present) {
5986 			rc = -EEXIST;
5987 			ksmbd_debug(SMB, "link already exists\n");
5988 			goto out;
5989 		}
5990 	}
5991 
5992 	rc = ksmbd_vfs_link(work, target_name, link_name);
5993 	if (rc)
5994 		rc = -EINVAL;
5995 out:
5996 	if (file_present)
5997 		ksmbd_vfs_kern_path_unlock(&parent_path, &path);
5998 
5999 	if (!IS_ERR(link_name))
6000 		kfree(link_name);
6001 	kfree(pathname);
6002 	return rc;
6003 }
6004 
set_file_basic_info(struct ksmbd_file * fp,struct smb2_file_basic_info * file_info,struct ksmbd_share_config * share)6005 static int set_file_basic_info(struct ksmbd_file *fp,
6006 			       struct smb2_file_basic_info *file_info,
6007 			       struct ksmbd_share_config *share)
6008 {
6009 	struct iattr attrs;
6010 	struct file *filp;
6011 	struct inode *inode;
6012 	struct mnt_idmap *idmap;
6013 	int rc = 0;
6014 
6015 	if (!(fp->daccess & FILE_WRITE_ATTRIBUTES_LE))
6016 		return -EACCES;
6017 
6018 	attrs.ia_valid = 0;
6019 	filp = fp->filp;
6020 	inode = file_inode(filp);
6021 	idmap = file_mnt_idmap(filp);
6022 
6023 	if (file_info->CreationTime)
6024 		fp->create_time = le64_to_cpu(file_info->CreationTime);
6025 
6026 	if (file_info->LastAccessTime) {
6027 		attrs.ia_atime = ksmbd_NTtimeToUnix(file_info->LastAccessTime);
6028 		attrs.ia_valid |= (ATTR_ATIME | ATTR_ATIME_SET);
6029 	}
6030 
6031 	if (file_info->ChangeTime)
6032 		inode_set_ctime_to_ts(inode,
6033 				ksmbd_NTtimeToUnix(file_info->ChangeTime));
6034 
6035 	if (file_info->LastWriteTime) {
6036 		attrs.ia_mtime = ksmbd_NTtimeToUnix(file_info->LastWriteTime);
6037 		attrs.ia_valid |= (ATTR_MTIME | ATTR_MTIME_SET | ATTR_CTIME);
6038 	}
6039 
6040 	if (file_info->Attributes) {
6041 		if (!S_ISDIR(inode->i_mode) &&
6042 		    file_info->Attributes & FILE_ATTRIBUTE_DIRECTORY_LE) {
6043 			pr_err("can't change a file to a directory\n");
6044 			return -EINVAL;
6045 		}
6046 
6047 		if (!(S_ISDIR(inode->i_mode) && file_info->Attributes == FILE_ATTRIBUTE_NORMAL_LE))
6048 			fp->f_ci->m_fattr = file_info->Attributes |
6049 				(fp->f_ci->m_fattr & FILE_ATTRIBUTE_DIRECTORY_LE);
6050 	}
6051 
6052 	if (test_share_config_flag(share, KSMBD_SHARE_FLAG_STORE_DOS_ATTRS) &&
6053 	    (file_info->CreationTime || file_info->Attributes)) {
6054 		struct xattr_dos_attrib da = {0};
6055 
6056 		da.version = 4;
6057 		da.itime = fp->itime;
6058 		da.create_time = fp->create_time;
6059 		da.attr = le32_to_cpu(fp->f_ci->m_fattr);
6060 		da.flags = XATTR_DOSINFO_ATTRIB | XATTR_DOSINFO_CREATE_TIME |
6061 			XATTR_DOSINFO_ITIME;
6062 
6063 		rc = ksmbd_vfs_set_dos_attrib_xattr(idmap, &filp->f_path, &da,
6064 				true);
6065 		if (rc)
6066 			ksmbd_debug(SMB,
6067 				    "failed to restore file attribute in EA\n");
6068 		rc = 0;
6069 	}
6070 
6071 	if (attrs.ia_valid) {
6072 		struct dentry *dentry = filp->f_path.dentry;
6073 		struct inode *inode = d_inode(dentry);
6074 
6075 		if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
6076 			return -EACCES;
6077 
6078 		inode_lock(inode);
6079 		rc = notify_change(idmap, dentry, &attrs, NULL);
6080 		inode_unlock(inode);
6081 	}
6082 	return rc;
6083 }
6084 
set_file_allocation_info(struct ksmbd_work * work,struct ksmbd_file * fp,struct smb2_file_alloc_info * file_alloc_info)6085 static int set_file_allocation_info(struct ksmbd_work *work,
6086 				    struct ksmbd_file *fp,
6087 				    struct smb2_file_alloc_info *file_alloc_info)
6088 {
6089 	/*
6090 	 * TODO : It's working fine only when store dos attributes
6091 	 * is not yes. need to implement a logic which works
6092 	 * properly with any smb.conf option
6093 	 */
6094 
6095 	loff_t alloc_blks;
6096 	struct inode *inode;
6097 	struct kstat stat;
6098 	int rc;
6099 
6100 	if (!(fp->daccess & FILE_WRITE_DATA_LE))
6101 		return -EACCES;
6102 
6103 	rc = vfs_getattr(&fp->filp->f_path, &stat, STATX_BASIC_STATS,
6104 			 AT_STATX_SYNC_AS_STAT);
6105 	if (rc)
6106 		return rc;
6107 
6108 	alloc_blks = (le64_to_cpu(file_alloc_info->AllocationSize) + 511) >> 9;
6109 	inode = file_inode(fp->filp);
6110 
6111 	if (alloc_blks > stat.blocks) {
6112 		smb_break_all_levII_oplock(work, fp, 1);
6113 		rc = vfs_fallocate(fp->filp, FALLOC_FL_KEEP_SIZE, 0,
6114 				   alloc_blks * 512);
6115 		if (rc && rc != -EOPNOTSUPP) {
6116 			pr_err("vfs_fallocate is failed : %d\n", rc);
6117 			return rc;
6118 		}
6119 	} else if (alloc_blks < stat.blocks) {
6120 		loff_t size;
6121 
6122 		/*
6123 		 * Allocation size could be smaller than original one
6124 		 * which means allocated blocks in file should be
6125 		 * deallocated. use truncate to cut out it, but inode
6126 		 * size is also updated with truncate offset.
6127 		 * inode size is retained by backup inode size.
6128 		 */
6129 		size = i_size_read(inode);
6130 		rc = ksmbd_vfs_truncate(work, fp, alloc_blks * 512);
6131 		if (rc) {
6132 			pr_err("truncate failed!, err %d\n", rc);
6133 			return rc;
6134 		}
6135 		if (size < alloc_blks * 512)
6136 			i_size_write(inode, size);
6137 	}
6138 	return 0;
6139 }
6140 
set_end_of_file_info(struct ksmbd_work * work,struct ksmbd_file * fp,struct smb2_file_eof_info * file_eof_info)6141 static int set_end_of_file_info(struct ksmbd_work *work, struct ksmbd_file *fp,
6142 				struct smb2_file_eof_info *file_eof_info)
6143 {
6144 	loff_t newsize;
6145 	struct inode *inode;
6146 	int rc;
6147 
6148 	if (!(fp->daccess & FILE_WRITE_DATA_LE))
6149 		return -EACCES;
6150 
6151 	newsize = le64_to_cpu(file_eof_info->EndOfFile);
6152 	inode = file_inode(fp->filp);
6153 
6154 	/*
6155 	 * If FILE_END_OF_FILE_INFORMATION of set_info_file is called
6156 	 * on FAT32 shared device, truncate execution time is too long
6157 	 * and network error could cause from windows client. because
6158 	 * truncate of some filesystem like FAT32 fill zero data in
6159 	 * truncated range.
6160 	 */
6161 	if (inode->i_sb->s_magic != MSDOS_SUPER_MAGIC) {
6162 		ksmbd_debug(SMB, "truncated to newsize %lld\n", newsize);
6163 		rc = ksmbd_vfs_truncate(work, fp, newsize);
6164 		if (rc) {
6165 			ksmbd_debug(SMB, "truncate failed!, err %d\n", rc);
6166 			if (rc != -EAGAIN)
6167 				rc = -EBADF;
6168 			return rc;
6169 		}
6170 	}
6171 	return 0;
6172 }
6173 
set_rename_info(struct ksmbd_work * work,struct ksmbd_file * fp,struct smb2_file_rename_info * rename_info,unsigned int buf_len)6174 static int set_rename_info(struct ksmbd_work *work, struct ksmbd_file *fp,
6175 			   struct smb2_file_rename_info *rename_info,
6176 			   unsigned int buf_len)
6177 {
6178 	if (!(fp->daccess & FILE_DELETE_LE)) {
6179 		pr_err("no right to delete : 0x%x\n", fp->daccess);
6180 		return -EACCES;
6181 	}
6182 
6183 	if (buf_len < (u64)sizeof(struct smb2_file_rename_info) +
6184 			le32_to_cpu(rename_info->FileNameLength))
6185 		return -EINVAL;
6186 
6187 	if (!le32_to_cpu(rename_info->FileNameLength))
6188 		return -EINVAL;
6189 
6190 	return smb2_rename(work, fp, rename_info, work->conn->local_nls);
6191 }
6192 
set_file_disposition_info(struct ksmbd_file * fp,struct smb2_file_disposition_info * file_info)6193 static int set_file_disposition_info(struct ksmbd_file *fp,
6194 				     struct smb2_file_disposition_info *file_info)
6195 {
6196 	struct inode *inode;
6197 
6198 	if (!(fp->daccess & FILE_DELETE_LE)) {
6199 		pr_err("no right to delete : 0x%x\n", fp->daccess);
6200 		return -EACCES;
6201 	}
6202 
6203 	inode = file_inode(fp->filp);
6204 	if (file_info->DeletePending) {
6205 		if (S_ISDIR(inode->i_mode) &&
6206 		    ksmbd_vfs_empty_dir(fp) == -ENOTEMPTY)
6207 			return -EBUSY;
6208 		ksmbd_set_inode_pending_delete(fp);
6209 	} else {
6210 		ksmbd_clear_inode_pending_delete(fp);
6211 	}
6212 	return 0;
6213 }
6214 
set_file_position_info(struct ksmbd_file * fp,struct smb2_file_pos_info * file_info)6215 static int set_file_position_info(struct ksmbd_file *fp,
6216 				  struct smb2_file_pos_info *file_info)
6217 {
6218 	loff_t current_byte_offset;
6219 	unsigned long sector_size;
6220 	struct inode *inode;
6221 
6222 	inode = file_inode(fp->filp);
6223 	current_byte_offset = le64_to_cpu(file_info->CurrentByteOffset);
6224 	sector_size = inode->i_sb->s_blocksize;
6225 
6226 	if (current_byte_offset < 0 ||
6227 	    (fp->coption == FILE_NO_INTERMEDIATE_BUFFERING_LE &&
6228 	     current_byte_offset & (sector_size - 1))) {
6229 		pr_err("CurrentByteOffset is not valid : %llu\n",
6230 		       current_byte_offset);
6231 		return -EINVAL;
6232 	}
6233 
6234 	fp->filp->f_pos = current_byte_offset;
6235 	return 0;
6236 }
6237 
set_file_mode_info(struct ksmbd_file * fp,struct smb2_file_mode_info * file_info)6238 static int set_file_mode_info(struct ksmbd_file *fp,
6239 			      struct smb2_file_mode_info *file_info)
6240 {
6241 	__le32 mode;
6242 
6243 	mode = file_info->Mode;
6244 
6245 	if ((mode & ~FILE_MODE_INFO_MASK)) {
6246 		pr_err("Mode is not valid : 0x%x\n", le32_to_cpu(mode));
6247 		return -EINVAL;
6248 	}
6249 
6250 	/*
6251 	 * TODO : need to implement consideration for
6252 	 * FILE_SYNCHRONOUS_IO_ALERT and FILE_SYNCHRONOUS_IO_NONALERT
6253 	 */
6254 	ksmbd_vfs_set_fadvise(fp->filp, mode);
6255 	fp->coption = mode;
6256 	return 0;
6257 }
6258 
6259 /**
6260  * smb2_set_info_file() - handler for smb2 set info command
6261  * @work:	smb work containing set info command buffer
6262  * @fp:		ksmbd_file pointer
6263  * @req:	request buffer pointer
6264  * @share:	ksmbd_share_config pointer
6265  *
6266  * Return:	0 on success, otherwise error
6267  * TODO: need to implement an error handling for STATUS_INFO_LENGTH_MISMATCH
6268  */
smb2_set_info_file(struct ksmbd_work * work,struct ksmbd_file * fp,struct smb2_set_info_req * req,struct ksmbd_share_config * share)6269 static int smb2_set_info_file(struct ksmbd_work *work, struct ksmbd_file *fp,
6270 			      struct smb2_set_info_req *req,
6271 			      struct ksmbd_share_config *share)
6272 {
6273 	unsigned int buf_len = le32_to_cpu(req->BufferLength);
6274 	char *buffer = (char *)req + le16_to_cpu(req->BufferOffset);
6275 
6276 	switch (req->FileInfoClass) {
6277 	case FILE_BASIC_INFORMATION:
6278 	{
6279 		if (buf_len < sizeof(struct smb2_file_basic_info))
6280 			return -EINVAL;
6281 
6282 		return set_file_basic_info(fp, (struct smb2_file_basic_info *)buffer, share);
6283 	}
6284 	case FILE_ALLOCATION_INFORMATION:
6285 	{
6286 		if (buf_len < sizeof(struct smb2_file_alloc_info))
6287 			return -EINVAL;
6288 
6289 		return set_file_allocation_info(work, fp,
6290 						(struct smb2_file_alloc_info *)buffer);
6291 	}
6292 	case FILE_END_OF_FILE_INFORMATION:
6293 	{
6294 		if (buf_len < sizeof(struct smb2_file_eof_info))
6295 			return -EINVAL;
6296 
6297 		return set_end_of_file_info(work, fp,
6298 					    (struct smb2_file_eof_info *)buffer);
6299 	}
6300 	case FILE_RENAME_INFORMATION:
6301 	{
6302 		if (buf_len < sizeof(struct smb2_file_rename_info))
6303 			return -EINVAL;
6304 
6305 		return set_rename_info(work, fp,
6306 				       (struct smb2_file_rename_info *)buffer,
6307 				       buf_len);
6308 	}
6309 	case FILE_LINK_INFORMATION:
6310 	{
6311 		if (buf_len < sizeof(struct smb2_file_link_info))
6312 			return -EINVAL;
6313 
6314 		return smb2_create_link(work, work->tcon->share_conf,
6315 					(struct smb2_file_link_info *)buffer,
6316 					buf_len, fp->filp,
6317 					work->conn->local_nls);
6318 	}
6319 	case FILE_DISPOSITION_INFORMATION:
6320 	{
6321 		if (buf_len < sizeof(struct smb2_file_disposition_info))
6322 			return -EINVAL;
6323 
6324 		return set_file_disposition_info(fp,
6325 						 (struct smb2_file_disposition_info *)buffer);
6326 	}
6327 	case FILE_FULL_EA_INFORMATION:
6328 	{
6329 		if (!(fp->daccess & FILE_WRITE_EA_LE)) {
6330 			pr_err("Not permitted to write ext  attr: 0x%x\n",
6331 			       fp->daccess);
6332 			return -EACCES;
6333 		}
6334 
6335 		if (buf_len < sizeof(struct smb2_ea_info))
6336 			return -EINVAL;
6337 
6338 		return smb2_set_ea((struct smb2_ea_info *)buffer,
6339 				   buf_len, &fp->filp->f_path, true);
6340 	}
6341 	case FILE_POSITION_INFORMATION:
6342 	{
6343 		if (buf_len < sizeof(struct smb2_file_pos_info))
6344 			return -EINVAL;
6345 
6346 		return set_file_position_info(fp, (struct smb2_file_pos_info *)buffer);
6347 	}
6348 	case FILE_MODE_INFORMATION:
6349 	{
6350 		if (buf_len < sizeof(struct smb2_file_mode_info))
6351 			return -EINVAL;
6352 
6353 		return set_file_mode_info(fp, (struct smb2_file_mode_info *)buffer);
6354 	}
6355 	}
6356 
6357 	pr_err("Unimplemented Fileinfoclass :%d\n", req->FileInfoClass);
6358 	return -EOPNOTSUPP;
6359 }
6360 
smb2_set_info_sec(struct ksmbd_file * fp,int addition_info,char * buffer,int buf_len)6361 static int smb2_set_info_sec(struct ksmbd_file *fp, int addition_info,
6362 			     char *buffer, int buf_len)
6363 {
6364 	struct smb_ntsd *pntsd = (struct smb_ntsd *)buffer;
6365 
6366 	fp->saccess |= FILE_SHARE_DELETE_LE;
6367 
6368 	return set_info_sec(fp->conn, fp->tcon, &fp->filp->f_path, pntsd,
6369 			buf_len, false, true);
6370 }
6371 
6372 /**
6373  * smb2_set_info() - handler for smb2 set info command handler
6374  * @work:	smb work containing set info request buffer
6375  *
6376  * Return:	0 on success, otherwise error
6377  */
smb2_set_info(struct ksmbd_work * work)6378 int smb2_set_info(struct ksmbd_work *work)
6379 {
6380 	struct smb2_set_info_req *req;
6381 	struct smb2_set_info_rsp *rsp;
6382 	struct ksmbd_file *fp = NULL;
6383 	int rc = 0;
6384 	unsigned int id = KSMBD_NO_FID, pid = KSMBD_NO_FID;
6385 
6386 	ksmbd_debug(SMB, "Received smb2 set info request\n");
6387 
6388 	if (work->next_smb2_rcv_hdr_off) {
6389 		req = ksmbd_req_buf_next(work);
6390 		rsp = ksmbd_resp_buf_next(work);
6391 		if (!has_file_id(req->VolatileFileId)) {
6392 			ksmbd_debug(SMB, "Compound request set FID = %llu\n",
6393 				    work->compound_fid);
6394 			id = work->compound_fid;
6395 			pid = work->compound_pfid;
6396 		}
6397 	} else {
6398 		req = smb2_get_msg(work->request_buf);
6399 		rsp = smb2_get_msg(work->response_buf);
6400 	}
6401 
6402 	if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
6403 		ksmbd_debug(SMB, "User does not have write permission\n");
6404 		pr_err("User does not have write permission\n");
6405 		rc = -EACCES;
6406 		goto err_out;
6407 	}
6408 
6409 	if (!has_file_id(id)) {
6410 		id = req->VolatileFileId;
6411 		pid = req->PersistentFileId;
6412 	}
6413 
6414 	fp = ksmbd_lookup_fd_slow(work, id, pid);
6415 	if (!fp) {
6416 		ksmbd_debug(SMB, "Invalid id for close: %u\n", id);
6417 		rc = -ENOENT;
6418 		goto err_out;
6419 	}
6420 
6421 	switch (req->InfoType) {
6422 	case SMB2_O_INFO_FILE:
6423 		ksmbd_debug(SMB, "GOT SMB2_O_INFO_FILE\n");
6424 		rc = smb2_set_info_file(work, fp, req, work->tcon->share_conf);
6425 		break;
6426 	case SMB2_O_INFO_SECURITY:
6427 		ksmbd_debug(SMB, "GOT SMB2_O_INFO_SECURITY\n");
6428 		if (ksmbd_override_fsids(work)) {
6429 			rc = -ENOMEM;
6430 			goto err_out;
6431 		}
6432 		rc = smb2_set_info_sec(fp,
6433 				       le32_to_cpu(req->AdditionalInformation),
6434 				       (char *)req + le16_to_cpu(req->BufferOffset),
6435 				       le32_to_cpu(req->BufferLength));
6436 		ksmbd_revert_fsids(work);
6437 		break;
6438 	default:
6439 		rc = -EOPNOTSUPP;
6440 	}
6441 
6442 	if (rc < 0)
6443 		goto err_out;
6444 
6445 	rsp->StructureSize = cpu_to_le16(2);
6446 	rc = ksmbd_iov_pin_rsp(work, (void *)rsp,
6447 			       sizeof(struct smb2_set_info_rsp));
6448 	if (rc)
6449 		goto err_out;
6450 	ksmbd_fd_put(work, fp);
6451 	return 0;
6452 
6453 err_out:
6454 	if (rc == -EACCES || rc == -EPERM || rc == -EXDEV)
6455 		rsp->hdr.Status = STATUS_ACCESS_DENIED;
6456 	else if (rc == -EINVAL)
6457 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
6458 	else if (rc == -ESHARE)
6459 		rsp->hdr.Status = STATUS_SHARING_VIOLATION;
6460 	else if (rc == -ENOENT)
6461 		rsp->hdr.Status = STATUS_OBJECT_NAME_INVALID;
6462 	else if (rc == -EBUSY || rc == -ENOTEMPTY)
6463 		rsp->hdr.Status = STATUS_DIRECTORY_NOT_EMPTY;
6464 	else if (rc == -EAGAIN)
6465 		rsp->hdr.Status = STATUS_FILE_LOCK_CONFLICT;
6466 	else if (rc == -EBADF || rc == -ESTALE)
6467 		rsp->hdr.Status = STATUS_INVALID_HANDLE;
6468 	else if (rc == -EEXIST)
6469 		rsp->hdr.Status = STATUS_OBJECT_NAME_COLLISION;
6470 	else if (rsp->hdr.Status == 0 || rc == -EOPNOTSUPP)
6471 		rsp->hdr.Status = STATUS_INVALID_INFO_CLASS;
6472 	smb2_set_err_rsp(work);
6473 	ksmbd_fd_put(work, fp);
6474 	ksmbd_debug(SMB, "error while processing smb2 query rc = %d\n", rc);
6475 	return rc;
6476 }
6477 
6478 /**
6479  * smb2_read_pipe() - handler for smb2 read from IPC pipe
6480  * @work:	smb work containing read IPC pipe command buffer
6481  *
6482  * Return:	0 on success, otherwise error
6483  */
smb2_read_pipe(struct ksmbd_work * work)6484 static noinline int smb2_read_pipe(struct ksmbd_work *work)
6485 {
6486 	int nbytes = 0, err;
6487 	u64 id;
6488 	struct ksmbd_rpc_command *rpc_resp;
6489 	struct smb2_read_req *req;
6490 	struct smb2_read_rsp *rsp;
6491 
6492 	WORK_BUFFERS(work, req, rsp);
6493 
6494 	id = req->VolatileFileId;
6495 
6496 	rpc_resp = ksmbd_rpc_read(work->sess, id);
6497 	if (rpc_resp) {
6498 		void *aux_payload_buf;
6499 
6500 		if (rpc_resp->flags != KSMBD_RPC_OK) {
6501 			err = -EINVAL;
6502 			goto out;
6503 		}
6504 
6505 		aux_payload_buf =
6506 			kvmalloc(rpc_resp->payload_sz, KSMBD_DEFAULT_GFP);
6507 		if (!aux_payload_buf) {
6508 			err = -ENOMEM;
6509 			goto out;
6510 		}
6511 
6512 		memcpy(aux_payload_buf, rpc_resp->payload, rpc_resp->payload_sz);
6513 
6514 		nbytes = rpc_resp->payload_sz;
6515 		err = ksmbd_iov_pin_rsp_read(work, (void *)rsp,
6516 					     offsetof(struct smb2_read_rsp, Buffer),
6517 					     aux_payload_buf, nbytes);
6518 		if (err) {
6519 			kvfree(aux_payload_buf);
6520 			goto out;
6521 		}
6522 		kvfree(rpc_resp);
6523 	} else {
6524 		err = ksmbd_iov_pin_rsp(work, (void *)rsp,
6525 					offsetof(struct smb2_read_rsp, Buffer));
6526 		if (err)
6527 			goto out;
6528 	}
6529 
6530 	rsp->StructureSize = cpu_to_le16(17);
6531 	rsp->DataOffset = 80;
6532 	rsp->Reserved = 0;
6533 	rsp->DataLength = cpu_to_le32(nbytes);
6534 	rsp->DataRemaining = 0;
6535 	rsp->Flags = 0;
6536 	return 0;
6537 
6538 out:
6539 	rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;
6540 	smb2_set_err_rsp(work);
6541 	kvfree(rpc_resp);
6542 	return err;
6543 }
6544 
smb2_set_remote_key_for_rdma(struct ksmbd_work * work,struct smb2_buffer_desc_v1 * desc,__le32 Channel,__le16 ChannelInfoLength)6545 static int smb2_set_remote_key_for_rdma(struct ksmbd_work *work,
6546 					struct smb2_buffer_desc_v1 *desc,
6547 					__le32 Channel,
6548 					__le16 ChannelInfoLength)
6549 {
6550 	unsigned int i, ch_count;
6551 
6552 	if (work->conn->dialect == SMB30_PROT_ID &&
6553 	    Channel != SMB2_CHANNEL_RDMA_V1)
6554 		return -EINVAL;
6555 
6556 	ch_count = le16_to_cpu(ChannelInfoLength) / sizeof(*desc);
6557 	if (ksmbd_debug_types & KSMBD_DEBUG_RDMA) {
6558 		for (i = 0; i < ch_count; i++) {
6559 			pr_info("RDMA r/w request %#x: token %#x, length %#x\n",
6560 				i,
6561 				le32_to_cpu(desc[i].token),
6562 				le32_to_cpu(desc[i].length));
6563 		}
6564 	}
6565 	if (!ch_count)
6566 		return -EINVAL;
6567 
6568 	work->need_invalidate_rkey =
6569 		(Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE);
6570 	if (Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE)
6571 		work->remote_key = le32_to_cpu(desc->token);
6572 	return 0;
6573 }
6574 
smb2_read_rdma_channel(struct ksmbd_work * work,struct smb2_read_req * req,void * data_buf,size_t length)6575 static ssize_t smb2_read_rdma_channel(struct ksmbd_work *work,
6576 				      struct smb2_read_req *req, void *data_buf,
6577 				      size_t length)
6578 {
6579 	int err;
6580 
6581 	err = ksmbd_conn_rdma_write(work->conn, data_buf, length,
6582 				    (struct smb2_buffer_desc_v1 *)
6583 				    ((char *)req + le16_to_cpu(req->ReadChannelInfoOffset)),
6584 				    le16_to_cpu(req->ReadChannelInfoLength));
6585 	if (err)
6586 		return err;
6587 
6588 	return length;
6589 }
6590 
6591 /**
6592  * smb2_read() - handler for smb2 read from file
6593  * @work:	smb work containing read command buffer
6594  *
6595  * Return:	0 on success, otherwise error
6596  */
smb2_read(struct ksmbd_work * work)6597 int smb2_read(struct ksmbd_work *work)
6598 {
6599 	struct ksmbd_conn *conn = work->conn;
6600 	struct smb2_read_req *req;
6601 	struct smb2_read_rsp *rsp;
6602 	struct ksmbd_file *fp = NULL;
6603 	loff_t offset;
6604 	size_t length, mincount;
6605 	ssize_t nbytes = 0, remain_bytes = 0;
6606 	int err = 0;
6607 	bool is_rdma_channel = false;
6608 	unsigned int max_read_size = conn->vals->max_read_size;
6609 	unsigned int id = KSMBD_NO_FID, pid = KSMBD_NO_FID;
6610 	void *aux_payload_buf;
6611 
6612 	ksmbd_debug(SMB, "Received smb2 read request\n");
6613 
6614 	if (test_share_config_flag(work->tcon->share_conf,
6615 				   KSMBD_SHARE_FLAG_PIPE)) {
6616 		ksmbd_debug(SMB, "IPC pipe read request\n");
6617 		return smb2_read_pipe(work);
6618 	}
6619 
6620 	if (work->next_smb2_rcv_hdr_off) {
6621 		req = ksmbd_req_buf_next(work);
6622 		rsp = ksmbd_resp_buf_next(work);
6623 		if (!has_file_id(req->VolatileFileId)) {
6624 			ksmbd_debug(SMB, "Compound request set FID = %llu\n",
6625 					work->compound_fid);
6626 			id = work->compound_fid;
6627 			pid = work->compound_pfid;
6628 		}
6629 	} else {
6630 		req = smb2_get_msg(work->request_buf);
6631 		rsp = smb2_get_msg(work->response_buf);
6632 	}
6633 
6634 	if (!has_file_id(id)) {
6635 		id = req->VolatileFileId;
6636 		pid = req->PersistentFileId;
6637 	}
6638 
6639 	if (req->Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE ||
6640 	    req->Channel == SMB2_CHANNEL_RDMA_V1) {
6641 		is_rdma_channel = true;
6642 		max_read_size = get_smbd_max_read_write_size();
6643 	}
6644 
6645 	if (is_rdma_channel == true) {
6646 		unsigned int ch_offset = le16_to_cpu(req->ReadChannelInfoOffset);
6647 
6648 		if (ch_offset < offsetof(struct smb2_read_req, Buffer)) {
6649 			err = -EINVAL;
6650 			goto out;
6651 		}
6652 		err = smb2_set_remote_key_for_rdma(work,
6653 						   (struct smb2_buffer_desc_v1 *)
6654 						   ((char *)req + ch_offset),
6655 						   req->Channel,
6656 						   req->ReadChannelInfoLength);
6657 		if (err)
6658 			goto out;
6659 	}
6660 
6661 	fp = ksmbd_lookup_fd_slow(work, id, pid);
6662 	if (!fp) {
6663 		err = -ENOENT;
6664 		goto out;
6665 	}
6666 
6667 	if (!(fp->daccess & (FILE_READ_DATA_LE | FILE_READ_ATTRIBUTES_LE))) {
6668 		pr_err("Not permitted to read : 0x%x\n", fp->daccess);
6669 		err = -EACCES;
6670 		goto out;
6671 	}
6672 
6673 	offset = le64_to_cpu(req->Offset);
6674 	if (offset < 0) {
6675 		err = -EINVAL;
6676 		goto out;
6677 	}
6678 	length = le32_to_cpu(req->Length);
6679 	mincount = le32_to_cpu(req->MinimumCount);
6680 
6681 	if (length > max_read_size) {
6682 		ksmbd_debug(SMB, "limiting read size to max size(%u)\n",
6683 			    max_read_size);
6684 		err = -EINVAL;
6685 		goto out;
6686 	}
6687 
6688 	ksmbd_debug(SMB, "filename %pD, offset %lld, len %zu\n",
6689 		    fp->filp, offset, length);
6690 
6691 	aux_payload_buf = kvzalloc(ALIGN(length, 8), KSMBD_DEFAULT_GFP);
6692 	if (!aux_payload_buf) {
6693 		err = -ENOMEM;
6694 		goto out;
6695 	}
6696 
6697 	nbytes = ksmbd_vfs_read(work, fp, length, &offset, aux_payload_buf);
6698 	if (nbytes < 0) {
6699 		err = nbytes;
6700 		goto out;
6701 	}
6702 
6703 	if ((nbytes == 0 && length != 0) || nbytes < mincount) {
6704 		kvfree(aux_payload_buf);
6705 		rsp->hdr.Status = STATUS_END_OF_FILE;
6706 		smb2_set_err_rsp(work);
6707 		ksmbd_fd_put(work, fp);
6708 		return 0;
6709 	}
6710 
6711 	ksmbd_debug(SMB, "nbytes %zu, offset %lld mincount %zu\n",
6712 		    nbytes, offset, mincount);
6713 
6714 	if (is_rdma_channel == true) {
6715 		/* write data to the client using rdma channel */
6716 		remain_bytes = smb2_read_rdma_channel(work, req,
6717 						      aux_payload_buf,
6718 						      nbytes);
6719 		kvfree(aux_payload_buf);
6720 		aux_payload_buf = NULL;
6721 		nbytes = 0;
6722 		if (remain_bytes < 0) {
6723 			err = (int)remain_bytes;
6724 			goto out;
6725 		}
6726 	}
6727 
6728 	rsp->StructureSize = cpu_to_le16(17);
6729 	rsp->DataOffset = 80;
6730 	rsp->Reserved = 0;
6731 	rsp->DataLength = cpu_to_le32(nbytes);
6732 	rsp->DataRemaining = cpu_to_le32(remain_bytes);
6733 	rsp->Flags = 0;
6734 	err = ksmbd_iov_pin_rsp_read(work, (void *)rsp,
6735 				     offsetof(struct smb2_read_rsp, Buffer),
6736 				     aux_payload_buf, nbytes);
6737 	if (err) {
6738 		kvfree(aux_payload_buf);
6739 		goto out;
6740 	}
6741 	ksmbd_fd_put(work, fp);
6742 	return 0;
6743 
6744 out:
6745 	if (err) {
6746 		if (err == -EISDIR)
6747 			rsp->hdr.Status = STATUS_INVALID_DEVICE_REQUEST;
6748 		else if (err == -EAGAIN)
6749 			rsp->hdr.Status = STATUS_FILE_LOCK_CONFLICT;
6750 		else if (err == -ENOENT)
6751 			rsp->hdr.Status = STATUS_FILE_CLOSED;
6752 		else if (err == -EACCES)
6753 			rsp->hdr.Status = STATUS_ACCESS_DENIED;
6754 		else if (err == -ESHARE)
6755 			rsp->hdr.Status = STATUS_SHARING_VIOLATION;
6756 		else if (err == -EINVAL)
6757 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
6758 		else
6759 			rsp->hdr.Status = STATUS_INVALID_HANDLE;
6760 
6761 		smb2_set_err_rsp(work);
6762 	}
6763 	ksmbd_fd_put(work, fp);
6764 	return err;
6765 }
6766 
6767 /**
6768  * smb2_write_pipe() - handler for smb2 write on IPC pipe
6769  * @work:	smb work containing write IPC pipe command buffer
6770  *
6771  * Return:	0 on success, otherwise error
6772  */
smb2_write_pipe(struct ksmbd_work * work)6773 static noinline int smb2_write_pipe(struct ksmbd_work *work)
6774 {
6775 	struct smb2_write_req *req;
6776 	struct smb2_write_rsp *rsp;
6777 	struct ksmbd_rpc_command *rpc_resp;
6778 	u64 id = 0;
6779 	int err = 0, ret = 0;
6780 	char *data_buf;
6781 	size_t length;
6782 
6783 	WORK_BUFFERS(work, req, rsp);
6784 
6785 	length = le32_to_cpu(req->Length);
6786 	id = req->VolatileFileId;
6787 
6788 	if ((u64)le16_to_cpu(req->DataOffset) + length >
6789 	    get_rfc1002_len(work->request_buf)) {
6790 		pr_err("invalid write data offset %u, smb_len %u\n",
6791 		       le16_to_cpu(req->DataOffset),
6792 		       get_rfc1002_len(work->request_buf));
6793 		err = -EINVAL;
6794 		goto out;
6795 	}
6796 
6797 	data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
6798 			   le16_to_cpu(req->DataOffset));
6799 
6800 	rpc_resp = ksmbd_rpc_write(work->sess, id, data_buf, length);
6801 	if (rpc_resp) {
6802 		if (rpc_resp->flags == KSMBD_RPC_ENOTIMPLEMENTED) {
6803 			rsp->hdr.Status = STATUS_NOT_SUPPORTED;
6804 			kvfree(rpc_resp);
6805 			smb2_set_err_rsp(work);
6806 			return -EOPNOTSUPP;
6807 		}
6808 		if (rpc_resp->flags != KSMBD_RPC_OK) {
6809 			rsp->hdr.Status = STATUS_INVALID_HANDLE;
6810 			smb2_set_err_rsp(work);
6811 			kvfree(rpc_resp);
6812 			return ret;
6813 		}
6814 		kvfree(rpc_resp);
6815 	}
6816 
6817 	rsp->StructureSize = cpu_to_le16(17);
6818 	rsp->DataOffset = 0;
6819 	rsp->Reserved = 0;
6820 	rsp->DataLength = cpu_to_le32(length);
6821 	rsp->DataRemaining = 0;
6822 	rsp->Reserved2 = 0;
6823 	err = ksmbd_iov_pin_rsp(work, (void *)rsp,
6824 				offsetof(struct smb2_write_rsp, Buffer));
6825 out:
6826 	if (err) {
6827 		rsp->hdr.Status = STATUS_INVALID_HANDLE;
6828 		smb2_set_err_rsp(work);
6829 	}
6830 
6831 	return err;
6832 }
6833 
smb2_write_rdma_channel(struct ksmbd_work * work,struct smb2_write_req * req,struct ksmbd_file * fp,loff_t offset,size_t length,bool sync)6834 static ssize_t smb2_write_rdma_channel(struct ksmbd_work *work,
6835 				       struct smb2_write_req *req,
6836 				       struct ksmbd_file *fp,
6837 				       loff_t offset, size_t length, bool sync)
6838 {
6839 	char *data_buf;
6840 	int ret;
6841 	ssize_t nbytes;
6842 
6843 	data_buf = kvzalloc(length, KSMBD_DEFAULT_GFP);
6844 	if (!data_buf)
6845 		return -ENOMEM;
6846 
6847 	ret = ksmbd_conn_rdma_read(work->conn, data_buf, length,
6848 				   (struct smb2_buffer_desc_v1 *)
6849 				   ((char *)req + le16_to_cpu(req->WriteChannelInfoOffset)),
6850 				   le16_to_cpu(req->WriteChannelInfoLength));
6851 	if (ret < 0) {
6852 		kvfree(data_buf);
6853 		return ret;
6854 	}
6855 
6856 	ret = ksmbd_vfs_write(work, fp, data_buf, length, &offset, sync, &nbytes);
6857 	kvfree(data_buf);
6858 	if (ret < 0)
6859 		return ret;
6860 
6861 	return nbytes;
6862 }
6863 
6864 /**
6865  * smb2_write() - handler for smb2 write from file
6866  * @work:	smb work containing write command buffer
6867  *
6868  * Return:	0 on success, otherwise error
6869  */
smb2_write(struct ksmbd_work * work)6870 int smb2_write(struct ksmbd_work *work)
6871 {
6872 	struct smb2_write_req *req;
6873 	struct smb2_write_rsp *rsp;
6874 	struct ksmbd_file *fp = NULL;
6875 	loff_t offset;
6876 	size_t length;
6877 	ssize_t nbytes;
6878 	char *data_buf;
6879 	bool writethrough = false, is_rdma_channel = false;
6880 	int err = 0;
6881 	unsigned int max_write_size = work->conn->vals->max_write_size;
6882 
6883 	ksmbd_debug(SMB, "Received smb2 write request\n");
6884 
6885 	WORK_BUFFERS(work, req, rsp);
6886 
6887 	if (test_share_config_flag(work->tcon->share_conf, KSMBD_SHARE_FLAG_PIPE)) {
6888 		ksmbd_debug(SMB, "IPC pipe write request\n");
6889 		return smb2_write_pipe(work);
6890 	}
6891 
6892 	offset = le64_to_cpu(req->Offset);
6893 	if (offset < 0)
6894 		return -EINVAL;
6895 	length = le32_to_cpu(req->Length);
6896 
6897 	if (req->Channel == SMB2_CHANNEL_RDMA_V1 ||
6898 	    req->Channel == SMB2_CHANNEL_RDMA_V1_INVALIDATE) {
6899 		is_rdma_channel = true;
6900 		max_write_size = get_smbd_max_read_write_size();
6901 		length = le32_to_cpu(req->RemainingBytes);
6902 	}
6903 
6904 	if (is_rdma_channel == true) {
6905 		unsigned int ch_offset = le16_to_cpu(req->WriteChannelInfoOffset);
6906 
6907 		if (req->Length != 0 || req->DataOffset != 0 ||
6908 		    ch_offset < offsetof(struct smb2_write_req, Buffer)) {
6909 			err = -EINVAL;
6910 			goto out;
6911 		}
6912 		err = smb2_set_remote_key_for_rdma(work,
6913 						   (struct smb2_buffer_desc_v1 *)
6914 						   ((char *)req + ch_offset),
6915 						   req->Channel,
6916 						   req->WriteChannelInfoLength);
6917 		if (err)
6918 			goto out;
6919 	}
6920 
6921 	if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
6922 		ksmbd_debug(SMB, "User does not have write permission\n");
6923 		err = -EACCES;
6924 		goto out;
6925 	}
6926 
6927 	fp = ksmbd_lookup_fd_slow(work, req->VolatileFileId, req->PersistentFileId);
6928 	if (!fp) {
6929 		err = -ENOENT;
6930 		goto out;
6931 	}
6932 
6933 	if (!(fp->daccess & (FILE_WRITE_DATA_LE | FILE_READ_ATTRIBUTES_LE))) {
6934 		pr_err("Not permitted to write : 0x%x\n", fp->daccess);
6935 		err = -EACCES;
6936 		goto out;
6937 	}
6938 
6939 	if (length > max_write_size) {
6940 		ksmbd_debug(SMB, "limiting write size to max size(%u)\n",
6941 			    max_write_size);
6942 		err = -EINVAL;
6943 		goto out;
6944 	}
6945 
6946 	ksmbd_debug(SMB, "flags %u\n", le32_to_cpu(req->Flags));
6947 	if (le32_to_cpu(req->Flags) & SMB2_WRITEFLAG_WRITE_THROUGH)
6948 		writethrough = true;
6949 
6950 	if (is_rdma_channel == false) {
6951 		if (le16_to_cpu(req->DataOffset) <
6952 		    offsetof(struct smb2_write_req, Buffer)) {
6953 			err = -EINVAL;
6954 			goto out;
6955 		}
6956 
6957 		data_buf = (char *)(((char *)&req->hdr.ProtocolId) +
6958 				    le16_to_cpu(req->DataOffset));
6959 
6960 		ksmbd_debug(SMB, "filename %pD, offset %lld, len %zu\n",
6961 			    fp->filp, offset, length);
6962 		err = ksmbd_vfs_write(work, fp, data_buf, length, &offset,
6963 				      writethrough, &nbytes);
6964 		if (err < 0)
6965 			goto out;
6966 	} else {
6967 		/* read data from the client using rdma channel, and
6968 		 * write the data.
6969 		 */
6970 		nbytes = smb2_write_rdma_channel(work, req, fp, offset, length,
6971 						 writethrough);
6972 		if (nbytes < 0) {
6973 			err = (int)nbytes;
6974 			goto out;
6975 		}
6976 	}
6977 
6978 	rsp->StructureSize = cpu_to_le16(17);
6979 	rsp->DataOffset = 0;
6980 	rsp->Reserved = 0;
6981 	rsp->DataLength = cpu_to_le32(nbytes);
6982 	rsp->DataRemaining = 0;
6983 	rsp->Reserved2 = 0;
6984 	err = ksmbd_iov_pin_rsp(work, rsp, offsetof(struct smb2_write_rsp, Buffer));
6985 	if (err)
6986 		goto out;
6987 	ksmbd_fd_put(work, fp);
6988 	return 0;
6989 
6990 out:
6991 	if (err == -EAGAIN)
6992 		rsp->hdr.Status = STATUS_FILE_LOCK_CONFLICT;
6993 	else if (err == -ENOSPC || err == -EFBIG)
6994 		rsp->hdr.Status = STATUS_DISK_FULL;
6995 	else if (err == -ENOENT)
6996 		rsp->hdr.Status = STATUS_FILE_CLOSED;
6997 	else if (err == -EACCES)
6998 		rsp->hdr.Status = STATUS_ACCESS_DENIED;
6999 	else if (err == -ESHARE)
7000 		rsp->hdr.Status = STATUS_SHARING_VIOLATION;
7001 	else if (err == -EINVAL)
7002 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
7003 	else
7004 		rsp->hdr.Status = STATUS_INVALID_HANDLE;
7005 
7006 	smb2_set_err_rsp(work);
7007 	ksmbd_fd_put(work, fp);
7008 	return err;
7009 }
7010 
7011 /**
7012  * smb2_flush() - handler for smb2 flush file - fsync
7013  * @work:	smb work containing flush command buffer
7014  *
7015  * Return:	0 on success, otherwise error
7016  */
smb2_flush(struct ksmbd_work * work)7017 int smb2_flush(struct ksmbd_work *work)
7018 {
7019 	struct smb2_flush_req *req;
7020 	struct smb2_flush_rsp *rsp;
7021 	int err;
7022 
7023 	WORK_BUFFERS(work, req, rsp);
7024 
7025 	ksmbd_debug(SMB, "Received smb2 flush request(fid : %llu)\n", req->VolatileFileId);
7026 
7027 	err = ksmbd_vfs_fsync(work, req->VolatileFileId, req->PersistentFileId);
7028 	if (err)
7029 		goto out;
7030 
7031 	rsp->StructureSize = cpu_to_le16(4);
7032 	rsp->Reserved = 0;
7033 	return ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_flush_rsp));
7034 
7035 out:
7036 	rsp->hdr.Status = STATUS_INVALID_HANDLE;
7037 	smb2_set_err_rsp(work);
7038 	return err;
7039 }
7040 
7041 /**
7042  * smb2_cancel() - handler for smb2 cancel command
7043  * @work:	smb work containing cancel command buffer
7044  *
7045  * Return:	0 on success, otherwise error
7046  */
smb2_cancel(struct ksmbd_work * work)7047 int smb2_cancel(struct ksmbd_work *work)
7048 {
7049 	struct ksmbd_conn *conn = work->conn;
7050 	struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
7051 	struct smb2_hdr *chdr;
7052 	struct ksmbd_work *iter;
7053 	struct list_head *command_list;
7054 
7055 	if (work->next_smb2_rcv_hdr_off)
7056 		hdr = ksmbd_resp_buf_next(work);
7057 
7058 	ksmbd_debug(SMB, "smb2 cancel called on mid %llu, async flags 0x%x\n",
7059 		    hdr->MessageId, hdr->Flags);
7060 
7061 	if (hdr->Flags & SMB2_FLAGS_ASYNC_COMMAND) {
7062 		command_list = &conn->async_requests;
7063 
7064 		spin_lock(&conn->request_lock);
7065 		list_for_each_entry(iter, command_list,
7066 				    async_request_entry) {
7067 			chdr = smb2_get_msg(iter->request_buf);
7068 
7069 			if (iter->async_id !=
7070 			    le64_to_cpu(hdr->Id.AsyncId))
7071 				continue;
7072 
7073 			ksmbd_debug(SMB,
7074 				    "smb2 with AsyncId %llu cancelled command = 0x%x\n",
7075 				    le64_to_cpu(hdr->Id.AsyncId),
7076 				    le16_to_cpu(chdr->Command));
7077 			iter->state = KSMBD_WORK_CANCELLED;
7078 			if (iter->cancel_fn)
7079 				iter->cancel_fn(iter->cancel_argv);
7080 			break;
7081 		}
7082 		spin_unlock(&conn->request_lock);
7083 	} else {
7084 		command_list = &conn->requests;
7085 
7086 		spin_lock(&conn->request_lock);
7087 		list_for_each_entry(iter, command_list, request_entry) {
7088 			chdr = smb2_get_msg(iter->request_buf);
7089 
7090 			if (chdr->MessageId != hdr->MessageId ||
7091 			    iter == work)
7092 				continue;
7093 
7094 			ksmbd_debug(SMB,
7095 				    "smb2 with mid %llu cancelled command = 0x%x\n",
7096 				    le64_to_cpu(hdr->MessageId),
7097 				    le16_to_cpu(chdr->Command));
7098 			iter->state = KSMBD_WORK_CANCELLED;
7099 			break;
7100 		}
7101 		spin_unlock(&conn->request_lock);
7102 	}
7103 
7104 	/* For SMB2_CANCEL command itself send no response*/
7105 	work->send_no_response = 1;
7106 	return 0;
7107 }
7108 
smb_flock_init(struct file * f)7109 struct file_lock *smb_flock_init(struct file *f)
7110 {
7111 	struct file_lock *fl;
7112 
7113 	fl = locks_alloc_lock();
7114 	if (!fl)
7115 		goto out;
7116 
7117 	locks_init_lock(fl);
7118 
7119 	fl->c.flc_owner = f;
7120 	fl->c.flc_pid = current->tgid;
7121 	fl->c.flc_file = f;
7122 	fl->c.flc_flags = FL_POSIX;
7123 	fl->fl_ops = NULL;
7124 	fl->fl_lmops = NULL;
7125 
7126 out:
7127 	return fl;
7128 }
7129 
smb2_set_flock_flags(struct file_lock * flock,int flags)7130 static int smb2_set_flock_flags(struct file_lock *flock, int flags)
7131 {
7132 	int cmd = -EINVAL;
7133 
7134 	/* Checking for wrong flag combination during lock request*/
7135 	switch (flags) {
7136 	case SMB2_LOCKFLAG_SHARED:
7137 		ksmbd_debug(SMB, "received shared request\n");
7138 		cmd = F_SETLKW;
7139 		flock->c.flc_type = F_RDLCK;
7140 		flock->c.flc_flags |= FL_SLEEP;
7141 		break;
7142 	case SMB2_LOCKFLAG_EXCLUSIVE:
7143 		ksmbd_debug(SMB, "received exclusive request\n");
7144 		cmd = F_SETLKW;
7145 		flock->c.flc_type = F_WRLCK;
7146 		flock->c.flc_flags |= FL_SLEEP;
7147 		break;
7148 	case SMB2_LOCKFLAG_SHARED | SMB2_LOCKFLAG_FAIL_IMMEDIATELY:
7149 		ksmbd_debug(SMB,
7150 			    "received shared & fail immediately request\n");
7151 		cmd = F_SETLK;
7152 		flock->c.flc_type = F_RDLCK;
7153 		break;
7154 	case SMB2_LOCKFLAG_EXCLUSIVE | SMB2_LOCKFLAG_FAIL_IMMEDIATELY:
7155 		ksmbd_debug(SMB,
7156 			    "received exclusive & fail immediately request\n");
7157 		cmd = F_SETLK;
7158 		flock->c.flc_type = F_WRLCK;
7159 		break;
7160 	case SMB2_LOCKFLAG_UNLOCK:
7161 		ksmbd_debug(SMB, "received unlock request\n");
7162 		flock->c.flc_type = F_UNLCK;
7163 		cmd = F_SETLK;
7164 		break;
7165 	}
7166 
7167 	return cmd;
7168 }
7169 
smb2_lock_init(struct file_lock * flock,unsigned int cmd,int flags,struct list_head * lock_list)7170 static struct ksmbd_lock *smb2_lock_init(struct file_lock *flock,
7171 					 unsigned int cmd, int flags,
7172 					 struct list_head *lock_list)
7173 {
7174 	struct ksmbd_lock *lock;
7175 
7176 	lock = kzalloc(sizeof(struct ksmbd_lock), KSMBD_DEFAULT_GFP);
7177 	if (!lock)
7178 		return NULL;
7179 
7180 	lock->cmd = cmd;
7181 	lock->fl = flock;
7182 	lock->start = flock->fl_start;
7183 	lock->end = flock->fl_end;
7184 	lock->flags = flags;
7185 	if (lock->start == lock->end)
7186 		lock->zero_len = 1;
7187 	INIT_LIST_HEAD(&lock->clist);
7188 	INIT_LIST_HEAD(&lock->flist);
7189 	INIT_LIST_HEAD(&lock->llist);
7190 	list_add_tail(&lock->llist, lock_list);
7191 
7192 	return lock;
7193 }
7194 
smb2_remove_blocked_lock(void ** argv)7195 static void smb2_remove_blocked_lock(void **argv)
7196 {
7197 	struct file_lock *flock = (struct file_lock *)argv[0];
7198 
7199 	ksmbd_vfs_posix_lock_unblock(flock);
7200 	locks_wake_up(flock);
7201 }
7202 
lock_defer_pending(struct file_lock * fl)7203 static inline bool lock_defer_pending(struct file_lock *fl)
7204 {
7205 	/* check pending lock waiters */
7206 	return waitqueue_active(&fl->c.flc_wait);
7207 }
7208 
7209 /**
7210  * smb2_lock() - handler for smb2 file lock command
7211  * @work:	smb work containing lock command buffer
7212  *
7213  * Return:	0 on success, otherwise error
7214  */
smb2_lock(struct ksmbd_work * work)7215 int smb2_lock(struct ksmbd_work *work)
7216 {
7217 	struct smb2_lock_req *req;
7218 	struct smb2_lock_rsp *rsp;
7219 	struct smb2_lock_element *lock_ele;
7220 	struct ksmbd_file *fp = NULL;
7221 	struct file_lock *flock = NULL;
7222 	struct file *filp = NULL;
7223 	int lock_count;
7224 	int flags = 0;
7225 	int cmd = 0;
7226 	int err = -EIO, i, rc = 0;
7227 	u64 lock_start, lock_length;
7228 	struct ksmbd_lock *smb_lock = NULL, *cmp_lock, *tmp, *tmp2;
7229 	struct ksmbd_conn *conn;
7230 	int nolock = 0;
7231 	LIST_HEAD(lock_list);
7232 	LIST_HEAD(rollback_list);
7233 	int prior_lock = 0;
7234 
7235 	WORK_BUFFERS(work, req, rsp);
7236 
7237 	ksmbd_debug(SMB, "Received smb2 lock request\n");
7238 	fp = ksmbd_lookup_fd_slow(work, req->VolatileFileId, req->PersistentFileId);
7239 	if (!fp) {
7240 		ksmbd_debug(SMB, "Invalid file id for lock : %llu\n", req->VolatileFileId);
7241 		err = -ENOENT;
7242 		goto out2;
7243 	}
7244 
7245 	filp = fp->filp;
7246 	lock_count = le16_to_cpu(req->LockCount);
7247 	lock_ele = req->locks;
7248 
7249 	ksmbd_debug(SMB, "lock count is %d\n", lock_count);
7250 	if (!lock_count) {
7251 		err = -EINVAL;
7252 		goto out2;
7253 	}
7254 
7255 	for (i = 0; i < lock_count; i++) {
7256 		flags = le32_to_cpu(lock_ele[i].Flags);
7257 
7258 		flock = smb_flock_init(filp);
7259 		if (!flock)
7260 			goto out;
7261 
7262 		cmd = smb2_set_flock_flags(flock, flags);
7263 
7264 		lock_start = le64_to_cpu(lock_ele[i].Offset);
7265 		lock_length = le64_to_cpu(lock_ele[i].Length);
7266 		if (lock_start > U64_MAX - lock_length) {
7267 			pr_err("Invalid lock range requested\n");
7268 			rsp->hdr.Status = STATUS_INVALID_LOCK_RANGE;
7269 			locks_free_lock(flock);
7270 			goto out;
7271 		}
7272 
7273 		if (lock_start > OFFSET_MAX)
7274 			flock->fl_start = OFFSET_MAX;
7275 		else
7276 			flock->fl_start = lock_start;
7277 
7278 		lock_length = le64_to_cpu(lock_ele[i].Length);
7279 		if (lock_length > OFFSET_MAX - flock->fl_start)
7280 			lock_length = OFFSET_MAX - flock->fl_start;
7281 
7282 		flock->fl_end = flock->fl_start + lock_length;
7283 
7284 		if (flock->fl_end < flock->fl_start) {
7285 			ksmbd_debug(SMB,
7286 				    "the end offset(%llx) is smaller than the start offset(%llx)\n",
7287 				    flock->fl_end, flock->fl_start);
7288 			rsp->hdr.Status = STATUS_INVALID_LOCK_RANGE;
7289 			locks_free_lock(flock);
7290 			goto out;
7291 		}
7292 
7293 		/* Check conflict locks in one request */
7294 		list_for_each_entry(cmp_lock, &lock_list, llist) {
7295 			if (cmp_lock->fl->fl_start <= flock->fl_start &&
7296 			    cmp_lock->fl->fl_end >= flock->fl_end) {
7297 				if (cmp_lock->fl->c.flc_type != F_UNLCK &&
7298 				    flock->c.flc_type != F_UNLCK) {
7299 					pr_err("conflict two locks in one request\n");
7300 					err = -EINVAL;
7301 					locks_free_lock(flock);
7302 					goto out;
7303 				}
7304 			}
7305 		}
7306 
7307 		smb_lock = smb2_lock_init(flock, cmd, flags, &lock_list);
7308 		if (!smb_lock) {
7309 			err = -EINVAL;
7310 			locks_free_lock(flock);
7311 			goto out;
7312 		}
7313 	}
7314 
7315 	list_for_each_entry_safe(smb_lock, tmp, &lock_list, llist) {
7316 		if (smb_lock->cmd < 0) {
7317 			err = -EINVAL;
7318 			goto out;
7319 		}
7320 
7321 		if (!(smb_lock->flags & SMB2_LOCKFLAG_MASK)) {
7322 			err = -EINVAL;
7323 			goto out;
7324 		}
7325 
7326 		if ((prior_lock & (SMB2_LOCKFLAG_EXCLUSIVE | SMB2_LOCKFLAG_SHARED) &&
7327 		     smb_lock->flags & SMB2_LOCKFLAG_UNLOCK) ||
7328 		    (prior_lock == SMB2_LOCKFLAG_UNLOCK &&
7329 		     !(smb_lock->flags & SMB2_LOCKFLAG_UNLOCK))) {
7330 			err = -EINVAL;
7331 			goto out;
7332 		}
7333 
7334 		prior_lock = smb_lock->flags;
7335 
7336 		if (!(smb_lock->flags & SMB2_LOCKFLAG_UNLOCK) &&
7337 		    !(smb_lock->flags & SMB2_LOCKFLAG_FAIL_IMMEDIATELY))
7338 			goto no_check_cl;
7339 
7340 		nolock = 1;
7341 		/* check locks in connection list */
7342 		down_read(&conn_list_lock);
7343 		list_for_each_entry(conn, &conn_list, conns_list) {
7344 			spin_lock(&conn->llist_lock);
7345 			list_for_each_entry_safe(cmp_lock, tmp2, &conn->lock_list, clist) {
7346 				if (file_inode(cmp_lock->fl->c.flc_file) !=
7347 				    file_inode(smb_lock->fl->c.flc_file))
7348 					continue;
7349 
7350 				if (lock_is_unlock(smb_lock->fl)) {
7351 					if (cmp_lock->fl->c.flc_file == smb_lock->fl->c.flc_file &&
7352 					    cmp_lock->start == smb_lock->start &&
7353 					    cmp_lock->end == smb_lock->end &&
7354 					    !lock_defer_pending(cmp_lock->fl)) {
7355 						nolock = 0;
7356 						list_del(&cmp_lock->flist);
7357 						list_del(&cmp_lock->clist);
7358 						spin_unlock(&conn->llist_lock);
7359 						up_read(&conn_list_lock);
7360 
7361 						locks_free_lock(cmp_lock->fl);
7362 						kfree(cmp_lock);
7363 						goto out_check_cl;
7364 					}
7365 					continue;
7366 				}
7367 
7368 				if (cmp_lock->fl->c.flc_file == smb_lock->fl->c.flc_file) {
7369 					if (smb_lock->flags & SMB2_LOCKFLAG_SHARED)
7370 						continue;
7371 				} else {
7372 					if (cmp_lock->flags & SMB2_LOCKFLAG_SHARED)
7373 						continue;
7374 				}
7375 
7376 				/* check zero byte lock range */
7377 				if (cmp_lock->zero_len && !smb_lock->zero_len &&
7378 				    cmp_lock->start > smb_lock->start &&
7379 				    cmp_lock->start < smb_lock->end) {
7380 					spin_unlock(&conn->llist_lock);
7381 					up_read(&conn_list_lock);
7382 					pr_err("previous lock conflict with zero byte lock range\n");
7383 					goto out;
7384 				}
7385 
7386 				if (smb_lock->zero_len && !cmp_lock->zero_len &&
7387 				    smb_lock->start > cmp_lock->start &&
7388 				    smb_lock->start < cmp_lock->end) {
7389 					spin_unlock(&conn->llist_lock);
7390 					up_read(&conn_list_lock);
7391 					pr_err("current lock conflict with zero byte lock range\n");
7392 					goto out;
7393 				}
7394 
7395 				if (((cmp_lock->start <= smb_lock->start &&
7396 				      cmp_lock->end > smb_lock->start) ||
7397 				     (cmp_lock->start < smb_lock->end &&
7398 				      cmp_lock->end >= smb_lock->end)) &&
7399 				    !cmp_lock->zero_len && !smb_lock->zero_len) {
7400 					spin_unlock(&conn->llist_lock);
7401 					up_read(&conn_list_lock);
7402 					pr_err("Not allow lock operation on exclusive lock range\n");
7403 					goto out;
7404 				}
7405 			}
7406 			spin_unlock(&conn->llist_lock);
7407 		}
7408 		up_read(&conn_list_lock);
7409 out_check_cl:
7410 		if (lock_is_unlock(smb_lock->fl) && nolock) {
7411 			pr_err("Try to unlock nolocked range\n");
7412 			rsp->hdr.Status = STATUS_RANGE_NOT_LOCKED;
7413 			goto out;
7414 		}
7415 
7416 no_check_cl:
7417 		if (smb_lock->zero_len) {
7418 			err = 0;
7419 			goto skip;
7420 		}
7421 
7422 		flock = smb_lock->fl;
7423 		list_del(&smb_lock->llist);
7424 retry:
7425 		rc = vfs_lock_file(filp, smb_lock->cmd, flock, NULL);
7426 skip:
7427 		if (flags & SMB2_LOCKFLAG_UNLOCK) {
7428 			if (!rc) {
7429 				ksmbd_debug(SMB, "File unlocked\n");
7430 			} else if (rc == -ENOENT) {
7431 				rsp->hdr.Status = STATUS_NOT_LOCKED;
7432 				goto out;
7433 			}
7434 			locks_free_lock(flock);
7435 			kfree(smb_lock);
7436 		} else {
7437 			if (rc == FILE_LOCK_DEFERRED) {
7438 				void **argv;
7439 
7440 				ksmbd_debug(SMB,
7441 					    "would have to wait for getting lock\n");
7442 				list_add(&smb_lock->llist, &rollback_list);
7443 
7444 				argv = kmalloc(sizeof(void *), KSMBD_DEFAULT_GFP);
7445 				if (!argv) {
7446 					err = -ENOMEM;
7447 					goto out;
7448 				}
7449 				argv[0] = flock;
7450 
7451 				rc = setup_async_work(work,
7452 						      smb2_remove_blocked_lock,
7453 						      argv);
7454 				if (rc) {
7455 					kfree(argv);
7456 					err = -ENOMEM;
7457 					goto out;
7458 				}
7459 				spin_lock(&fp->f_lock);
7460 				list_add(&work->fp_entry, &fp->blocked_works);
7461 				spin_unlock(&fp->f_lock);
7462 
7463 				smb2_send_interim_resp(work, STATUS_PENDING);
7464 
7465 				ksmbd_vfs_posix_lock_wait(flock);
7466 
7467 				spin_lock(&fp->f_lock);
7468 				list_del(&work->fp_entry);
7469 				spin_unlock(&fp->f_lock);
7470 
7471 				if (work->state != KSMBD_WORK_ACTIVE) {
7472 					list_del(&smb_lock->llist);
7473 					locks_free_lock(flock);
7474 
7475 					if (work->state == KSMBD_WORK_CANCELLED) {
7476 						rsp->hdr.Status =
7477 							STATUS_CANCELLED;
7478 						kfree(smb_lock);
7479 						smb2_send_interim_resp(work,
7480 								       STATUS_CANCELLED);
7481 						work->send_no_response = 1;
7482 						goto out;
7483 					}
7484 
7485 					rsp->hdr.Status =
7486 						STATUS_RANGE_NOT_LOCKED;
7487 					kfree(smb_lock);
7488 					goto out2;
7489 				}
7490 
7491 				list_del(&smb_lock->llist);
7492 				release_async_work(work);
7493 				goto retry;
7494 			} else if (!rc) {
7495 				list_add(&smb_lock->llist, &rollback_list);
7496 				spin_lock(&work->conn->llist_lock);
7497 				list_add_tail(&smb_lock->clist,
7498 					      &work->conn->lock_list);
7499 				list_add_tail(&smb_lock->flist,
7500 					      &fp->lock_list);
7501 				spin_unlock(&work->conn->llist_lock);
7502 				ksmbd_debug(SMB, "successful in taking lock\n");
7503 			} else {
7504 				goto out;
7505 			}
7506 		}
7507 	}
7508 
7509 	if (atomic_read(&fp->f_ci->op_count) > 1)
7510 		smb_break_all_oplock(work, fp);
7511 
7512 	rsp->StructureSize = cpu_to_le16(4);
7513 	ksmbd_debug(SMB, "successful in taking lock\n");
7514 	rsp->hdr.Status = STATUS_SUCCESS;
7515 	rsp->Reserved = 0;
7516 	err = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_lock_rsp));
7517 	if (err)
7518 		goto out;
7519 
7520 	ksmbd_fd_put(work, fp);
7521 	return 0;
7522 
7523 out:
7524 	list_for_each_entry_safe(smb_lock, tmp, &lock_list, llist) {
7525 		locks_free_lock(smb_lock->fl);
7526 		list_del(&smb_lock->llist);
7527 		kfree(smb_lock);
7528 	}
7529 
7530 	list_for_each_entry_safe(smb_lock, tmp, &rollback_list, llist) {
7531 		struct file_lock *rlock = NULL;
7532 
7533 		rlock = smb_flock_init(filp);
7534 		rlock->c.flc_type = F_UNLCK;
7535 		rlock->fl_start = smb_lock->start;
7536 		rlock->fl_end = smb_lock->end;
7537 
7538 		rc = vfs_lock_file(filp, F_SETLK, rlock, NULL);
7539 		if (rc)
7540 			pr_err("rollback unlock fail : %d\n", rc);
7541 
7542 		list_del(&smb_lock->llist);
7543 		spin_lock(&work->conn->llist_lock);
7544 		if (!list_empty(&smb_lock->flist))
7545 			list_del(&smb_lock->flist);
7546 		list_del(&smb_lock->clist);
7547 		spin_unlock(&work->conn->llist_lock);
7548 
7549 		locks_free_lock(smb_lock->fl);
7550 		locks_free_lock(rlock);
7551 		kfree(smb_lock);
7552 	}
7553 out2:
7554 	ksmbd_debug(SMB, "failed in taking lock(flags : %x), err : %d\n", flags, err);
7555 
7556 	if (!rsp->hdr.Status) {
7557 		if (err == -EINVAL)
7558 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
7559 		else if (err == -ENOMEM)
7560 			rsp->hdr.Status = STATUS_INSUFFICIENT_RESOURCES;
7561 		else if (err == -ENOENT)
7562 			rsp->hdr.Status = STATUS_FILE_CLOSED;
7563 		else
7564 			rsp->hdr.Status = STATUS_LOCK_NOT_GRANTED;
7565 	}
7566 
7567 	smb2_set_err_rsp(work);
7568 	ksmbd_fd_put(work, fp);
7569 	return err;
7570 }
7571 
fsctl_copychunk(struct ksmbd_work * work,struct copychunk_ioctl_req * ci_req,unsigned int cnt_code,unsigned int input_count,unsigned long long volatile_id,unsigned long long persistent_id,struct smb2_ioctl_rsp * rsp)7572 static int fsctl_copychunk(struct ksmbd_work *work,
7573 			   struct copychunk_ioctl_req *ci_req,
7574 			   unsigned int cnt_code,
7575 			   unsigned int input_count,
7576 			   unsigned long long volatile_id,
7577 			   unsigned long long persistent_id,
7578 			   struct smb2_ioctl_rsp *rsp)
7579 {
7580 	struct copychunk_ioctl_rsp *ci_rsp;
7581 	struct ksmbd_file *src_fp = NULL, *dst_fp = NULL;
7582 	struct srv_copychunk *chunks;
7583 	unsigned int i, chunk_count, chunk_count_written = 0;
7584 	unsigned int chunk_size_written = 0;
7585 	loff_t total_size_written = 0;
7586 	int ret = 0;
7587 
7588 	ci_rsp = (struct copychunk_ioctl_rsp *)&rsp->Buffer[0];
7589 
7590 	rsp->VolatileFileId = volatile_id;
7591 	rsp->PersistentFileId = persistent_id;
7592 	ci_rsp->ChunksWritten =
7593 		cpu_to_le32(ksmbd_server_side_copy_max_chunk_count());
7594 	ci_rsp->ChunkBytesWritten =
7595 		cpu_to_le32(ksmbd_server_side_copy_max_chunk_size());
7596 	ci_rsp->TotalBytesWritten =
7597 		cpu_to_le32(ksmbd_server_side_copy_max_total_size());
7598 
7599 	chunk_count = le32_to_cpu(ci_req->ChunkCount);
7600 	if (chunk_count == 0)
7601 		goto out;
7602 	total_size_written = 0;
7603 
7604 	/* verify the SRV_COPYCHUNK_COPY packet */
7605 	if (chunk_count > ksmbd_server_side_copy_max_chunk_count() ||
7606 	    input_count < struct_size(ci_req, Chunks, chunk_count)) {
7607 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
7608 		return -EINVAL;
7609 	}
7610 
7611 	chunks = &ci_req->Chunks[0];
7612 	for (i = 0; i < chunk_count; i++) {
7613 		if (le32_to_cpu(chunks[i].Length) == 0 ||
7614 		    le32_to_cpu(chunks[i].Length) > ksmbd_server_side_copy_max_chunk_size())
7615 			break;
7616 		total_size_written += le32_to_cpu(chunks[i].Length);
7617 	}
7618 
7619 	if (i < chunk_count ||
7620 	    total_size_written > ksmbd_server_side_copy_max_total_size()) {
7621 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
7622 		return -EINVAL;
7623 	}
7624 
7625 	src_fp = ksmbd_lookup_foreign_fd(work,
7626 					 le64_to_cpu(ci_req->ResumeKey[0]));
7627 	dst_fp = ksmbd_lookup_fd_slow(work, volatile_id, persistent_id);
7628 	ret = -EINVAL;
7629 	if (!src_fp ||
7630 	    src_fp->persistent_id != le64_to_cpu(ci_req->ResumeKey[1])) {
7631 		rsp->hdr.Status = STATUS_OBJECT_NAME_NOT_FOUND;
7632 		goto out;
7633 	}
7634 
7635 	if (!dst_fp) {
7636 		rsp->hdr.Status = STATUS_FILE_CLOSED;
7637 		goto out;
7638 	}
7639 
7640 	/*
7641 	 * FILE_READ_DATA should only be included in
7642 	 * the FSCTL_COPYCHUNK case
7643 	 */
7644 	if (cnt_code == FSCTL_COPYCHUNK &&
7645 	    !(dst_fp->daccess & (FILE_READ_DATA_LE | FILE_GENERIC_READ_LE))) {
7646 		rsp->hdr.Status = STATUS_ACCESS_DENIED;
7647 		goto out;
7648 	}
7649 
7650 	ret = ksmbd_vfs_copy_file_ranges(work, src_fp, dst_fp,
7651 					 chunks, chunk_count,
7652 					 &chunk_count_written,
7653 					 &chunk_size_written,
7654 					 &total_size_written);
7655 	if (ret < 0) {
7656 		if (ret == -EACCES)
7657 			rsp->hdr.Status = STATUS_ACCESS_DENIED;
7658 		if (ret == -EAGAIN)
7659 			rsp->hdr.Status = STATUS_FILE_LOCK_CONFLICT;
7660 		else if (ret == -EBADF)
7661 			rsp->hdr.Status = STATUS_INVALID_HANDLE;
7662 		else if (ret == -EFBIG || ret == -ENOSPC)
7663 			rsp->hdr.Status = STATUS_DISK_FULL;
7664 		else if (ret == -EINVAL)
7665 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
7666 		else if (ret == -EISDIR)
7667 			rsp->hdr.Status = STATUS_FILE_IS_A_DIRECTORY;
7668 		else if (ret == -E2BIG)
7669 			rsp->hdr.Status = STATUS_INVALID_VIEW_SIZE;
7670 		else
7671 			rsp->hdr.Status = STATUS_UNEXPECTED_IO_ERROR;
7672 	}
7673 
7674 	ci_rsp->ChunksWritten = cpu_to_le32(chunk_count_written);
7675 	ci_rsp->ChunkBytesWritten = cpu_to_le32(chunk_size_written);
7676 	ci_rsp->TotalBytesWritten = cpu_to_le32(total_size_written);
7677 out:
7678 	ksmbd_fd_put(work, src_fp);
7679 	ksmbd_fd_put(work, dst_fp);
7680 	return ret;
7681 }
7682 
idev_ipv4_address(struct in_device * idev)7683 static __be32 idev_ipv4_address(struct in_device *idev)
7684 {
7685 	__be32 addr = 0;
7686 
7687 	struct in_ifaddr *ifa;
7688 
7689 	rcu_read_lock();
7690 	in_dev_for_each_ifa_rcu(ifa, idev) {
7691 		if (ifa->ifa_flags & IFA_F_SECONDARY)
7692 			continue;
7693 
7694 		addr = ifa->ifa_address;
7695 		break;
7696 	}
7697 	rcu_read_unlock();
7698 	return addr;
7699 }
7700 
fsctl_query_iface_info_ioctl(struct ksmbd_conn * conn,struct smb2_ioctl_rsp * rsp,unsigned int out_buf_len)7701 static int fsctl_query_iface_info_ioctl(struct ksmbd_conn *conn,
7702 					struct smb2_ioctl_rsp *rsp,
7703 					unsigned int out_buf_len)
7704 {
7705 	struct network_interface_info_ioctl_rsp *nii_rsp = NULL;
7706 	int nbytes = 0;
7707 	struct net_device *netdev;
7708 	struct sockaddr_storage_rsp *sockaddr_storage;
7709 	unsigned int flags;
7710 	unsigned long long speed;
7711 
7712 	rtnl_lock();
7713 	for_each_netdev(&init_net, netdev) {
7714 		bool ipv4_set = false;
7715 
7716 		if (netdev->type == ARPHRD_LOOPBACK)
7717 			continue;
7718 
7719 		flags = dev_get_flags(netdev);
7720 		if (!(flags & IFF_RUNNING))
7721 			continue;
7722 ipv6_retry:
7723 		if (out_buf_len <
7724 		    nbytes + sizeof(struct network_interface_info_ioctl_rsp)) {
7725 			rtnl_unlock();
7726 			return -ENOSPC;
7727 		}
7728 
7729 		nii_rsp = (struct network_interface_info_ioctl_rsp *)
7730 				&rsp->Buffer[nbytes];
7731 		nii_rsp->IfIndex = cpu_to_le32(netdev->ifindex);
7732 
7733 		nii_rsp->Capability = 0;
7734 		if (netdev->real_num_tx_queues > 1)
7735 			nii_rsp->Capability |= cpu_to_le32(RSS_CAPABLE);
7736 		if (ksmbd_rdma_capable_netdev(netdev))
7737 			nii_rsp->Capability |= cpu_to_le32(RDMA_CAPABLE);
7738 
7739 		nii_rsp->Next = cpu_to_le32(152);
7740 		nii_rsp->Reserved = 0;
7741 
7742 		if (netdev->ethtool_ops->get_link_ksettings) {
7743 			struct ethtool_link_ksettings cmd;
7744 
7745 			netdev->ethtool_ops->get_link_ksettings(netdev, &cmd);
7746 			speed = cmd.base.speed;
7747 		} else {
7748 			ksmbd_debug(SMB, "%s %s\n", netdev->name,
7749 				    "speed is unknown, defaulting to 1Gb/sec");
7750 			speed = SPEED_1000;
7751 		}
7752 
7753 		speed *= 1000000;
7754 		nii_rsp->LinkSpeed = cpu_to_le64(speed);
7755 
7756 		sockaddr_storage = (struct sockaddr_storage_rsp *)
7757 					nii_rsp->SockAddr_Storage;
7758 		memset(sockaddr_storage, 0, 128);
7759 
7760 		if (!ipv4_set) {
7761 			struct in_device *idev;
7762 
7763 			sockaddr_storage->Family = cpu_to_le16(INTERNETWORK);
7764 			sockaddr_storage->addr4.Port = 0;
7765 
7766 			idev = __in_dev_get_rtnl(netdev);
7767 			if (!idev)
7768 				continue;
7769 			sockaddr_storage->addr4.IPv4address =
7770 						idev_ipv4_address(idev);
7771 			nbytes += sizeof(struct network_interface_info_ioctl_rsp);
7772 			ipv4_set = true;
7773 			goto ipv6_retry;
7774 		} else {
7775 			struct inet6_dev *idev6;
7776 			struct inet6_ifaddr *ifa;
7777 			__u8 *ipv6_addr = sockaddr_storage->addr6.IPv6address;
7778 
7779 			sockaddr_storage->Family = cpu_to_le16(INTERNETWORKV6);
7780 			sockaddr_storage->addr6.Port = 0;
7781 			sockaddr_storage->addr6.FlowInfo = 0;
7782 
7783 			idev6 = __in6_dev_get(netdev);
7784 			if (!idev6)
7785 				continue;
7786 
7787 			list_for_each_entry(ifa, &idev6->addr_list, if_list) {
7788 				if (ifa->flags & (IFA_F_TENTATIVE |
7789 							IFA_F_DEPRECATED))
7790 					continue;
7791 				memcpy(ipv6_addr, ifa->addr.s6_addr, 16);
7792 				break;
7793 			}
7794 			sockaddr_storage->addr6.ScopeId = 0;
7795 			nbytes += sizeof(struct network_interface_info_ioctl_rsp);
7796 		}
7797 	}
7798 	rtnl_unlock();
7799 
7800 	/* zero if this is last one */
7801 	if (nii_rsp)
7802 		nii_rsp->Next = 0;
7803 
7804 	rsp->PersistentFileId = SMB2_NO_FID;
7805 	rsp->VolatileFileId = SMB2_NO_FID;
7806 	return nbytes;
7807 }
7808 
fsctl_validate_negotiate_info(struct ksmbd_conn * conn,struct validate_negotiate_info_req * neg_req,struct validate_negotiate_info_rsp * neg_rsp,unsigned int in_buf_len)7809 static int fsctl_validate_negotiate_info(struct ksmbd_conn *conn,
7810 					 struct validate_negotiate_info_req *neg_req,
7811 					 struct validate_negotiate_info_rsp *neg_rsp,
7812 					 unsigned int in_buf_len)
7813 {
7814 	int ret = 0;
7815 	int dialect;
7816 
7817 	if (in_buf_len < offsetof(struct validate_negotiate_info_req, Dialects) +
7818 			le16_to_cpu(neg_req->DialectCount) * sizeof(__le16))
7819 		return -EINVAL;
7820 
7821 	dialect = ksmbd_lookup_dialect_by_id(neg_req->Dialects,
7822 					     neg_req->DialectCount);
7823 	if (dialect == BAD_PROT_ID || dialect != conn->dialect) {
7824 		ret = -EINVAL;
7825 		goto err_out;
7826 	}
7827 
7828 	if (strncmp(neg_req->Guid, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE)) {
7829 		ret = -EINVAL;
7830 		goto err_out;
7831 	}
7832 
7833 	if (le16_to_cpu(neg_req->SecurityMode) != conn->cli_sec_mode) {
7834 		ret = -EINVAL;
7835 		goto err_out;
7836 	}
7837 
7838 	if (le32_to_cpu(neg_req->Capabilities) != conn->cli_cap) {
7839 		ret = -EINVAL;
7840 		goto err_out;
7841 	}
7842 
7843 	neg_rsp->Capabilities = cpu_to_le32(conn->vals->capabilities);
7844 	memset(neg_rsp->Guid, 0, SMB2_CLIENT_GUID_SIZE);
7845 	neg_rsp->SecurityMode = cpu_to_le16(conn->srv_sec_mode);
7846 	neg_rsp->Dialect = cpu_to_le16(conn->dialect);
7847 err_out:
7848 	return ret;
7849 }
7850 
fsctl_query_allocated_ranges(struct ksmbd_work * work,u64 id,struct file_allocated_range_buffer * qar_req,struct file_allocated_range_buffer * qar_rsp,unsigned int in_count,unsigned int * out_count)7851 static int fsctl_query_allocated_ranges(struct ksmbd_work *work, u64 id,
7852 					struct file_allocated_range_buffer *qar_req,
7853 					struct file_allocated_range_buffer *qar_rsp,
7854 					unsigned int in_count, unsigned int *out_count)
7855 {
7856 	struct ksmbd_file *fp;
7857 	loff_t start, length;
7858 	int ret = 0;
7859 
7860 	*out_count = 0;
7861 	if (in_count == 0)
7862 		return -EINVAL;
7863 
7864 	start = le64_to_cpu(qar_req->file_offset);
7865 	length = le64_to_cpu(qar_req->length);
7866 
7867 	if (start < 0 || length < 0)
7868 		return -EINVAL;
7869 
7870 	fp = ksmbd_lookup_fd_fast(work, id);
7871 	if (!fp)
7872 		return -ENOENT;
7873 
7874 	ret = ksmbd_vfs_fqar_lseek(fp, start, length,
7875 				   qar_rsp, in_count, out_count);
7876 	if (ret && ret != -E2BIG)
7877 		*out_count = 0;
7878 
7879 	ksmbd_fd_put(work, fp);
7880 	return ret;
7881 }
7882 
fsctl_pipe_transceive(struct ksmbd_work * work,u64 id,unsigned int out_buf_len,struct smb2_ioctl_req * req,struct smb2_ioctl_rsp * rsp)7883 static int fsctl_pipe_transceive(struct ksmbd_work *work, u64 id,
7884 				 unsigned int out_buf_len,
7885 				 struct smb2_ioctl_req *req,
7886 				 struct smb2_ioctl_rsp *rsp)
7887 {
7888 	struct ksmbd_rpc_command *rpc_resp;
7889 	char *data_buf = (char *)req + le32_to_cpu(req->InputOffset);
7890 	int nbytes = 0;
7891 
7892 	rpc_resp = ksmbd_rpc_ioctl(work->sess, id, data_buf,
7893 				   le32_to_cpu(req->InputCount));
7894 	if (rpc_resp) {
7895 		if (rpc_resp->flags == KSMBD_RPC_SOME_NOT_MAPPED) {
7896 			/*
7897 			 * set STATUS_SOME_NOT_MAPPED response
7898 			 * for unknown domain sid.
7899 			 */
7900 			rsp->hdr.Status = STATUS_SOME_NOT_MAPPED;
7901 		} else if (rpc_resp->flags == KSMBD_RPC_ENOTIMPLEMENTED) {
7902 			rsp->hdr.Status = STATUS_NOT_SUPPORTED;
7903 			goto out;
7904 		} else if (rpc_resp->flags != KSMBD_RPC_OK) {
7905 			rsp->hdr.Status = STATUS_INVALID_PARAMETER;
7906 			goto out;
7907 		}
7908 
7909 		nbytes = rpc_resp->payload_sz;
7910 		if (rpc_resp->payload_sz > out_buf_len) {
7911 			rsp->hdr.Status = STATUS_BUFFER_OVERFLOW;
7912 			nbytes = out_buf_len;
7913 		}
7914 
7915 		if (!rpc_resp->payload_sz) {
7916 			rsp->hdr.Status =
7917 				STATUS_UNEXPECTED_IO_ERROR;
7918 			goto out;
7919 		}
7920 
7921 		memcpy((char *)rsp->Buffer, rpc_resp->payload, nbytes);
7922 	}
7923 out:
7924 	kvfree(rpc_resp);
7925 	return nbytes;
7926 }
7927 
fsctl_set_sparse(struct ksmbd_work * work,u64 id,struct file_sparse * sparse)7928 static inline int fsctl_set_sparse(struct ksmbd_work *work, u64 id,
7929 				   struct file_sparse *sparse)
7930 {
7931 	struct ksmbd_file *fp;
7932 	struct mnt_idmap *idmap;
7933 	int ret = 0;
7934 	__le32 old_fattr;
7935 
7936 	fp = ksmbd_lookup_fd_fast(work, id);
7937 	if (!fp)
7938 		return -ENOENT;
7939 	idmap = file_mnt_idmap(fp->filp);
7940 
7941 	old_fattr = fp->f_ci->m_fattr;
7942 	if (sparse->SetSparse)
7943 		fp->f_ci->m_fattr |= FILE_ATTRIBUTE_SPARSE_FILE_LE;
7944 	else
7945 		fp->f_ci->m_fattr &= ~FILE_ATTRIBUTE_SPARSE_FILE_LE;
7946 
7947 	if (fp->f_ci->m_fattr != old_fattr &&
7948 	    test_share_config_flag(work->tcon->share_conf,
7949 				   KSMBD_SHARE_FLAG_STORE_DOS_ATTRS)) {
7950 		struct xattr_dos_attrib da;
7951 
7952 		ret = ksmbd_vfs_get_dos_attrib_xattr(idmap,
7953 						     fp->filp->f_path.dentry, &da);
7954 		if (ret <= 0)
7955 			goto out;
7956 
7957 		da.attr = le32_to_cpu(fp->f_ci->m_fattr);
7958 		ret = ksmbd_vfs_set_dos_attrib_xattr(idmap,
7959 						     &fp->filp->f_path,
7960 						     &da, true);
7961 		if (ret)
7962 			fp->f_ci->m_fattr = old_fattr;
7963 	}
7964 
7965 out:
7966 	ksmbd_fd_put(work, fp);
7967 	return ret;
7968 }
7969 
fsctl_request_resume_key(struct ksmbd_work * work,struct smb2_ioctl_req * req,struct resume_key_ioctl_rsp * key_rsp)7970 static int fsctl_request_resume_key(struct ksmbd_work *work,
7971 				    struct smb2_ioctl_req *req,
7972 				    struct resume_key_ioctl_rsp *key_rsp)
7973 {
7974 	struct ksmbd_file *fp;
7975 
7976 	fp = ksmbd_lookup_fd_slow(work, req->VolatileFileId, req->PersistentFileId);
7977 	if (!fp)
7978 		return -ENOENT;
7979 
7980 	memset(key_rsp, 0, sizeof(*key_rsp));
7981 	key_rsp->ResumeKey[0] = req->VolatileFileId;
7982 	key_rsp->ResumeKey[1] = req->PersistentFileId;
7983 	ksmbd_fd_put(work, fp);
7984 
7985 	return 0;
7986 }
7987 
7988 /**
7989  * smb2_ioctl() - handler for smb2 ioctl command
7990  * @work:	smb work containing ioctl command buffer
7991  *
7992  * Return:	0 on success, otherwise error
7993  */
smb2_ioctl(struct ksmbd_work * work)7994 int smb2_ioctl(struct ksmbd_work *work)
7995 {
7996 	struct smb2_ioctl_req *req;
7997 	struct smb2_ioctl_rsp *rsp;
7998 	unsigned int cnt_code, nbytes = 0, out_buf_len, in_buf_len;
7999 	u64 id = KSMBD_NO_FID;
8000 	struct ksmbd_conn *conn = work->conn;
8001 	int ret = 0;
8002 	char *buffer;
8003 
8004 	ksmbd_debug(SMB, "Received smb2 ioctl request\n");
8005 
8006 	if (work->next_smb2_rcv_hdr_off) {
8007 		req = ksmbd_req_buf_next(work);
8008 		rsp = ksmbd_resp_buf_next(work);
8009 		if (!has_file_id(req->VolatileFileId)) {
8010 			ksmbd_debug(SMB, "Compound request set FID = %llu\n",
8011 				    work->compound_fid);
8012 			id = work->compound_fid;
8013 		}
8014 	} else {
8015 		req = smb2_get_msg(work->request_buf);
8016 		rsp = smb2_get_msg(work->response_buf);
8017 	}
8018 
8019 	if (!has_file_id(id))
8020 		id = req->VolatileFileId;
8021 
8022 	if (req->Flags != cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL)) {
8023 		rsp->hdr.Status = STATUS_NOT_SUPPORTED;
8024 		goto out;
8025 	}
8026 
8027 	buffer = (char *)req + le32_to_cpu(req->InputOffset);
8028 
8029 	cnt_code = le32_to_cpu(req->CtlCode);
8030 	ret = smb2_calc_max_out_buf_len(work, 48,
8031 					le32_to_cpu(req->MaxOutputResponse));
8032 	if (ret < 0) {
8033 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
8034 		goto out;
8035 	}
8036 	out_buf_len = (unsigned int)ret;
8037 	in_buf_len = le32_to_cpu(req->InputCount);
8038 
8039 	switch (cnt_code) {
8040 	case FSCTL_DFS_GET_REFERRALS:
8041 	case FSCTL_DFS_GET_REFERRALS_EX:
8042 		/* Not support DFS yet */
8043 		rsp->hdr.Status = STATUS_FS_DRIVER_REQUIRED;
8044 		goto out;
8045 	case FSCTL_CREATE_OR_GET_OBJECT_ID:
8046 	{
8047 		struct file_object_buf_type1_ioctl_rsp *obj_buf;
8048 
8049 		nbytes = sizeof(struct file_object_buf_type1_ioctl_rsp);
8050 		obj_buf = (struct file_object_buf_type1_ioctl_rsp *)
8051 			&rsp->Buffer[0];
8052 
8053 		/*
8054 		 * TODO: This is dummy implementation to pass smbtorture
8055 		 * Need to check correct response later
8056 		 */
8057 		memset(obj_buf->ObjectId, 0x0, 16);
8058 		memset(obj_buf->BirthVolumeId, 0x0, 16);
8059 		memset(obj_buf->BirthObjectId, 0x0, 16);
8060 		memset(obj_buf->DomainId, 0x0, 16);
8061 
8062 		break;
8063 	}
8064 	case FSCTL_PIPE_TRANSCEIVE:
8065 		out_buf_len = min_t(u32, KSMBD_IPC_MAX_PAYLOAD, out_buf_len);
8066 		nbytes = fsctl_pipe_transceive(work, id, out_buf_len, req, rsp);
8067 		break;
8068 	case FSCTL_VALIDATE_NEGOTIATE_INFO:
8069 		if (conn->dialect < SMB30_PROT_ID) {
8070 			ret = -EOPNOTSUPP;
8071 			goto out;
8072 		}
8073 
8074 		if (in_buf_len < offsetof(struct validate_negotiate_info_req,
8075 					  Dialects)) {
8076 			ret = -EINVAL;
8077 			goto out;
8078 		}
8079 
8080 		if (out_buf_len < sizeof(struct validate_negotiate_info_rsp)) {
8081 			ret = -EINVAL;
8082 			goto out;
8083 		}
8084 
8085 		ret = fsctl_validate_negotiate_info(conn,
8086 			(struct validate_negotiate_info_req *)buffer,
8087 			(struct validate_negotiate_info_rsp *)&rsp->Buffer[0],
8088 			in_buf_len);
8089 		if (ret < 0)
8090 			goto out;
8091 
8092 		nbytes = sizeof(struct validate_negotiate_info_rsp);
8093 		rsp->PersistentFileId = SMB2_NO_FID;
8094 		rsp->VolatileFileId = SMB2_NO_FID;
8095 		break;
8096 	case FSCTL_QUERY_NETWORK_INTERFACE_INFO:
8097 		ret = fsctl_query_iface_info_ioctl(conn, rsp, out_buf_len);
8098 		if (ret < 0)
8099 			goto out;
8100 		nbytes = ret;
8101 		break;
8102 	case FSCTL_REQUEST_RESUME_KEY:
8103 		if (out_buf_len < sizeof(struct resume_key_ioctl_rsp)) {
8104 			ret = -EINVAL;
8105 			goto out;
8106 		}
8107 
8108 		ret = fsctl_request_resume_key(work, req,
8109 					       (struct resume_key_ioctl_rsp *)&rsp->Buffer[0]);
8110 		if (ret < 0)
8111 			goto out;
8112 		rsp->PersistentFileId = req->PersistentFileId;
8113 		rsp->VolatileFileId = req->VolatileFileId;
8114 		nbytes = sizeof(struct resume_key_ioctl_rsp);
8115 		break;
8116 	case FSCTL_COPYCHUNK:
8117 	case FSCTL_COPYCHUNK_WRITE:
8118 		if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
8119 			ksmbd_debug(SMB,
8120 				    "User does not have write permission\n");
8121 			ret = -EACCES;
8122 			goto out;
8123 		}
8124 
8125 		if (in_buf_len <= sizeof(struct copychunk_ioctl_req)) {
8126 			ret = -EINVAL;
8127 			goto out;
8128 		}
8129 
8130 		if (out_buf_len < sizeof(struct copychunk_ioctl_rsp)) {
8131 			ret = -EINVAL;
8132 			goto out;
8133 		}
8134 
8135 		nbytes = sizeof(struct copychunk_ioctl_rsp);
8136 		rsp->VolatileFileId = req->VolatileFileId;
8137 		rsp->PersistentFileId = req->PersistentFileId;
8138 		fsctl_copychunk(work,
8139 				(struct copychunk_ioctl_req *)buffer,
8140 				le32_to_cpu(req->CtlCode),
8141 				le32_to_cpu(req->InputCount),
8142 				req->VolatileFileId,
8143 				req->PersistentFileId,
8144 				rsp);
8145 		break;
8146 	case FSCTL_SET_SPARSE:
8147 		if (in_buf_len < sizeof(struct file_sparse)) {
8148 			ret = -EINVAL;
8149 			goto out;
8150 		}
8151 
8152 		ret = fsctl_set_sparse(work, id, (struct file_sparse *)buffer);
8153 		if (ret < 0)
8154 			goto out;
8155 		break;
8156 	case FSCTL_SET_ZERO_DATA:
8157 	{
8158 		struct file_zero_data_information *zero_data;
8159 		struct ksmbd_file *fp;
8160 		loff_t off, len, bfz;
8161 
8162 		if (!test_tree_conn_flag(work->tcon, KSMBD_TREE_CONN_FLAG_WRITABLE)) {
8163 			ksmbd_debug(SMB,
8164 				    "User does not have write permission\n");
8165 			ret = -EACCES;
8166 			goto out;
8167 		}
8168 
8169 		if (in_buf_len < sizeof(struct file_zero_data_information)) {
8170 			ret = -EINVAL;
8171 			goto out;
8172 		}
8173 
8174 		zero_data =
8175 			(struct file_zero_data_information *)buffer;
8176 
8177 		off = le64_to_cpu(zero_data->FileOffset);
8178 		bfz = le64_to_cpu(zero_data->BeyondFinalZero);
8179 		if (off < 0 || bfz < 0 || off > bfz) {
8180 			ret = -EINVAL;
8181 			goto out;
8182 		}
8183 
8184 		len = bfz - off;
8185 		if (len) {
8186 			fp = ksmbd_lookup_fd_fast(work, id);
8187 			if (!fp) {
8188 				ret = -ENOENT;
8189 				goto out;
8190 			}
8191 
8192 			ret = ksmbd_vfs_zero_data(work, fp, off, len);
8193 			ksmbd_fd_put(work, fp);
8194 			if (ret < 0)
8195 				goto out;
8196 		}
8197 		break;
8198 	}
8199 	case FSCTL_QUERY_ALLOCATED_RANGES:
8200 		if (in_buf_len < sizeof(struct file_allocated_range_buffer)) {
8201 			ret = -EINVAL;
8202 			goto out;
8203 		}
8204 
8205 		ret = fsctl_query_allocated_ranges(work, id,
8206 			(struct file_allocated_range_buffer *)buffer,
8207 			(struct file_allocated_range_buffer *)&rsp->Buffer[0],
8208 			out_buf_len /
8209 			sizeof(struct file_allocated_range_buffer), &nbytes);
8210 		if (ret == -E2BIG) {
8211 			rsp->hdr.Status = STATUS_BUFFER_OVERFLOW;
8212 		} else if (ret < 0) {
8213 			nbytes = 0;
8214 			goto out;
8215 		}
8216 
8217 		nbytes *= sizeof(struct file_allocated_range_buffer);
8218 		break;
8219 	case FSCTL_GET_REPARSE_POINT:
8220 	{
8221 		struct reparse_data_buffer *reparse_ptr;
8222 		struct ksmbd_file *fp;
8223 
8224 		reparse_ptr = (struct reparse_data_buffer *)&rsp->Buffer[0];
8225 		fp = ksmbd_lookup_fd_fast(work, id);
8226 		if (!fp) {
8227 			pr_err("not found fp!!\n");
8228 			ret = -ENOENT;
8229 			goto out;
8230 		}
8231 
8232 		reparse_ptr->ReparseTag =
8233 			smb2_get_reparse_tag_special_file(file_inode(fp->filp)->i_mode);
8234 		reparse_ptr->ReparseDataLength = 0;
8235 		ksmbd_fd_put(work, fp);
8236 		nbytes = sizeof(struct reparse_data_buffer);
8237 		break;
8238 	}
8239 	case FSCTL_DUPLICATE_EXTENTS_TO_FILE:
8240 	{
8241 		struct ksmbd_file *fp_in, *fp_out = NULL;
8242 		struct duplicate_extents_to_file *dup_ext;
8243 		loff_t src_off, dst_off, length, cloned;
8244 
8245 		if (in_buf_len < sizeof(struct duplicate_extents_to_file)) {
8246 			ret = -EINVAL;
8247 			goto out;
8248 		}
8249 
8250 		dup_ext = (struct duplicate_extents_to_file *)buffer;
8251 
8252 		fp_in = ksmbd_lookup_fd_slow(work, dup_ext->VolatileFileHandle,
8253 					     dup_ext->PersistentFileHandle);
8254 		if (!fp_in) {
8255 			pr_err("not found file handle in duplicate extent to file\n");
8256 			ret = -ENOENT;
8257 			goto out;
8258 		}
8259 
8260 		fp_out = ksmbd_lookup_fd_fast(work, id);
8261 		if (!fp_out) {
8262 			pr_err("not found fp\n");
8263 			ret = -ENOENT;
8264 			goto dup_ext_out;
8265 		}
8266 
8267 		src_off = le64_to_cpu(dup_ext->SourceFileOffset);
8268 		dst_off = le64_to_cpu(dup_ext->TargetFileOffset);
8269 		length = le64_to_cpu(dup_ext->ByteCount);
8270 		/*
8271 		 * XXX: It is not clear if FSCTL_DUPLICATE_EXTENTS_TO_FILE
8272 		 * should fall back to vfs_copy_file_range().  This could be
8273 		 * beneficial when re-exporting nfs/smb mount, but note that
8274 		 * this can result in partial copy that returns an error status.
8275 		 * If/when FSCTL_DUPLICATE_EXTENTS_TO_FILE_EX is implemented,
8276 		 * fall back to vfs_copy_file_range(), should be avoided when
8277 		 * the flag DUPLICATE_EXTENTS_DATA_EX_SOURCE_ATOMIC is set.
8278 		 */
8279 		cloned = vfs_clone_file_range(fp_in->filp, src_off,
8280 					      fp_out->filp, dst_off, length, 0);
8281 		if (cloned == -EXDEV || cloned == -EOPNOTSUPP) {
8282 			ret = -EOPNOTSUPP;
8283 			goto dup_ext_out;
8284 		} else if (cloned != length) {
8285 			cloned = vfs_copy_file_range(fp_in->filp, src_off,
8286 						     fp_out->filp, dst_off,
8287 						     length, 0);
8288 			if (cloned != length) {
8289 				if (cloned < 0)
8290 					ret = cloned;
8291 				else
8292 					ret = -EINVAL;
8293 			}
8294 		}
8295 
8296 dup_ext_out:
8297 		ksmbd_fd_put(work, fp_in);
8298 		ksmbd_fd_put(work, fp_out);
8299 		if (ret < 0)
8300 			goto out;
8301 		break;
8302 	}
8303 	default:
8304 		ksmbd_debug(SMB, "not implemented yet ioctl command 0x%x\n",
8305 			    cnt_code);
8306 		ret = -EOPNOTSUPP;
8307 		goto out;
8308 	}
8309 
8310 	rsp->CtlCode = cpu_to_le32(cnt_code);
8311 	rsp->InputCount = cpu_to_le32(0);
8312 	rsp->InputOffset = cpu_to_le32(112);
8313 	rsp->OutputOffset = cpu_to_le32(112);
8314 	rsp->OutputCount = cpu_to_le32(nbytes);
8315 	rsp->StructureSize = cpu_to_le16(49);
8316 	rsp->Reserved = cpu_to_le16(0);
8317 	rsp->Flags = cpu_to_le32(0);
8318 	rsp->Reserved2 = cpu_to_le32(0);
8319 	ret = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_ioctl_rsp) + nbytes);
8320 	if (!ret)
8321 		return ret;
8322 
8323 out:
8324 	if (ret == -EACCES)
8325 		rsp->hdr.Status = STATUS_ACCESS_DENIED;
8326 	else if (ret == -ENOENT)
8327 		rsp->hdr.Status = STATUS_OBJECT_NAME_NOT_FOUND;
8328 	else if (ret == -EOPNOTSUPP)
8329 		rsp->hdr.Status = STATUS_NOT_SUPPORTED;
8330 	else if (ret == -ENOSPC)
8331 		rsp->hdr.Status = STATUS_BUFFER_TOO_SMALL;
8332 	else if (ret < 0 || rsp->hdr.Status == 0)
8333 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
8334 	smb2_set_err_rsp(work);
8335 	return 0;
8336 }
8337 
8338 /**
8339  * smb20_oplock_break_ack() - handler for smb2.0 oplock break command
8340  * @work:	smb work containing oplock break command buffer
8341  *
8342  * Return:	0
8343  */
smb20_oplock_break_ack(struct ksmbd_work * work)8344 static void smb20_oplock_break_ack(struct ksmbd_work *work)
8345 {
8346 	struct smb2_oplock_break *req;
8347 	struct smb2_oplock_break *rsp;
8348 	struct ksmbd_file *fp;
8349 	struct oplock_info *opinfo = NULL;
8350 	__le32 err = 0;
8351 	int ret = 0;
8352 	u64 volatile_id, persistent_id;
8353 	char req_oplevel = 0, rsp_oplevel = 0;
8354 	unsigned int oplock_change_type;
8355 
8356 	WORK_BUFFERS(work, req, rsp);
8357 
8358 	volatile_id = req->VolatileFid;
8359 	persistent_id = req->PersistentFid;
8360 	req_oplevel = req->OplockLevel;
8361 	ksmbd_debug(OPLOCK, "v_id %llu, p_id %llu request oplock level %d\n",
8362 		    volatile_id, persistent_id, req_oplevel);
8363 
8364 	fp = ksmbd_lookup_fd_slow(work, volatile_id, persistent_id);
8365 	if (!fp) {
8366 		rsp->hdr.Status = STATUS_FILE_CLOSED;
8367 		smb2_set_err_rsp(work);
8368 		return;
8369 	}
8370 
8371 	opinfo = opinfo_get(fp);
8372 	if (!opinfo) {
8373 		pr_err("unexpected null oplock_info\n");
8374 		rsp->hdr.Status = STATUS_INVALID_OPLOCK_PROTOCOL;
8375 		smb2_set_err_rsp(work);
8376 		ksmbd_fd_put(work, fp);
8377 		return;
8378 	}
8379 
8380 	if (opinfo->level == SMB2_OPLOCK_LEVEL_NONE) {
8381 		rsp->hdr.Status = STATUS_INVALID_OPLOCK_PROTOCOL;
8382 		goto err_out;
8383 	}
8384 
8385 	if (opinfo->op_state == OPLOCK_STATE_NONE) {
8386 		ksmbd_debug(SMB, "unexpected oplock state 0x%x\n", opinfo->op_state);
8387 		rsp->hdr.Status = STATUS_UNSUCCESSFUL;
8388 		goto err_out;
8389 	}
8390 
8391 	if ((opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
8392 	     opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) &&
8393 	    (req_oplevel != SMB2_OPLOCK_LEVEL_II &&
8394 	     req_oplevel != SMB2_OPLOCK_LEVEL_NONE)) {
8395 		err = STATUS_INVALID_OPLOCK_PROTOCOL;
8396 		oplock_change_type = OPLOCK_WRITE_TO_NONE;
8397 	} else if (opinfo->level == SMB2_OPLOCK_LEVEL_II &&
8398 		   req_oplevel != SMB2_OPLOCK_LEVEL_NONE) {
8399 		err = STATUS_INVALID_OPLOCK_PROTOCOL;
8400 		oplock_change_type = OPLOCK_READ_TO_NONE;
8401 	} else if (req_oplevel == SMB2_OPLOCK_LEVEL_II ||
8402 		   req_oplevel == SMB2_OPLOCK_LEVEL_NONE) {
8403 		err = STATUS_INVALID_DEVICE_STATE;
8404 		if ((opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
8405 		     opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) &&
8406 		    req_oplevel == SMB2_OPLOCK_LEVEL_II) {
8407 			oplock_change_type = OPLOCK_WRITE_TO_READ;
8408 		} else if ((opinfo->level == SMB2_OPLOCK_LEVEL_EXCLUSIVE ||
8409 			    opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) &&
8410 			   req_oplevel == SMB2_OPLOCK_LEVEL_NONE) {
8411 			oplock_change_type = OPLOCK_WRITE_TO_NONE;
8412 		} else if (opinfo->level == SMB2_OPLOCK_LEVEL_II &&
8413 			   req_oplevel == SMB2_OPLOCK_LEVEL_NONE) {
8414 			oplock_change_type = OPLOCK_READ_TO_NONE;
8415 		} else {
8416 			oplock_change_type = 0;
8417 		}
8418 	} else {
8419 		oplock_change_type = 0;
8420 	}
8421 
8422 	switch (oplock_change_type) {
8423 	case OPLOCK_WRITE_TO_READ:
8424 		ret = opinfo_write_to_read(opinfo);
8425 		rsp_oplevel = SMB2_OPLOCK_LEVEL_II;
8426 		break;
8427 	case OPLOCK_WRITE_TO_NONE:
8428 		ret = opinfo_write_to_none(opinfo);
8429 		rsp_oplevel = SMB2_OPLOCK_LEVEL_NONE;
8430 		break;
8431 	case OPLOCK_READ_TO_NONE:
8432 		ret = opinfo_read_to_none(opinfo);
8433 		rsp_oplevel = SMB2_OPLOCK_LEVEL_NONE;
8434 		break;
8435 	default:
8436 		pr_err("unknown oplock change 0x%x -> 0x%x\n",
8437 		       opinfo->level, rsp_oplevel);
8438 	}
8439 
8440 	if (ret < 0) {
8441 		rsp->hdr.Status = err;
8442 		goto err_out;
8443 	}
8444 
8445 	opinfo->op_state = OPLOCK_STATE_NONE;
8446 	wake_up_interruptible_all(&opinfo->oplock_q);
8447 	opinfo_put(opinfo);
8448 	ksmbd_fd_put(work, fp);
8449 
8450 	rsp->StructureSize = cpu_to_le16(24);
8451 	rsp->OplockLevel = rsp_oplevel;
8452 	rsp->Reserved = 0;
8453 	rsp->Reserved2 = 0;
8454 	rsp->VolatileFid = volatile_id;
8455 	rsp->PersistentFid = persistent_id;
8456 	ret = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_oplock_break));
8457 	if (!ret)
8458 		return;
8459 
8460 err_out:
8461 	opinfo->op_state = OPLOCK_STATE_NONE;
8462 	wake_up_interruptible_all(&opinfo->oplock_q);
8463 
8464 	opinfo_put(opinfo);
8465 	ksmbd_fd_put(work, fp);
8466 	smb2_set_err_rsp(work);
8467 }
8468 
check_lease_state(struct lease * lease,__le32 req_state)8469 static int check_lease_state(struct lease *lease, __le32 req_state)
8470 {
8471 	if ((lease->new_state ==
8472 	     (SMB2_LEASE_READ_CACHING_LE | SMB2_LEASE_HANDLE_CACHING_LE)) &&
8473 	    !(req_state & SMB2_LEASE_WRITE_CACHING_LE)) {
8474 		lease->new_state = req_state;
8475 		return 0;
8476 	}
8477 
8478 	if (lease->new_state == req_state)
8479 		return 0;
8480 
8481 	return 1;
8482 }
8483 
8484 /**
8485  * smb21_lease_break_ack() - handler for smb2.1 lease break command
8486  * @work:	smb work containing lease break command buffer
8487  *
8488  * Return:	0
8489  */
smb21_lease_break_ack(struct ksmbd_work * work)8490 static void smb21_lease_break_ack(struct ksmbd_work *work)
8491 {
8492 	struct ksmbd_conn *conn = work->conn;
8493 	struct smb2_lease_ack *req;
8494 	struct smb2_lease_ack *rsp;
8495 	struct oplock_info *opinfo;
8496 	__le32 err = 0;
8497 	int ret = 0;
8498 	unsigned int lease_change_type;
8499 	__le32 lease_state;
8500 	struct lease *lease;
8501 
8502 	WORK_BUFFERS(work, req, rsp);
8503 
8504 	ksmbd_debug(OPLOCK, "smb21 lease break, lease state(0x%x)\n",
8505 		    le32_to_cpu(req->LeaseState));
8506 	opinfo = lookup_lease_in_table(conn, req->LeaseKey);
8507 	if (!opinfo) {
8508 		ksmbd_debug(OPLOCK, "file not opened\n");
8509 		smb2_set_err_rsp(work);
8510 		rsp->hdr.Status = STATUS_UNSUCCESSFUL;
8511 		return;
8512 	}
8513 	lease = opinfo->o_lease;
8514 
8515 	if (opinfo->op_state == OPLOCK_STATE_NONE) {
8516 		pr_err("unexpected lease break state 0x%x\n",
8517 		       opinfo->op_state);
8518 		rsp->hdr.Status = STATUS_UNSUCCESSFUL;
8519 		goto err_out;
8520 	}
8521 
8522 	if (check_lease_state(lease, req->LeaseState)) {
8523 		rsp->hdr.Status = STATUS_REQUEST_NOT_ACCEPTED;
8524 		ksmbd_debug(OPLOCK,
8525 			    "req lease state: 0x%x, expected state: 0x%x\n",
8526 			    req->LeaseState, lease->new_state);
8527 		goto err_out;
8528 	}
8529 
8530 	if (!atomic_read(&opinfo->breaking_cnt)) {
8531 		rsp->hdr.Status = STATUS_UNSUCCESSFUL;
8532 		goto err_out;
8533 	}
8534 
8535 	/* check for bad lease state */
8536 	if (req->LeaseState &
8537 	    (~(SMB2_LEASE_READ_CACHING_LE | SMB2_LEASE_HANDLE_CACHING_LE))) {
8538 		err = STATUS_INVALID_OPLOCK_PROTOCOL;
8539 		if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
8540 			lease_change_type = OPLOCK_WRITE_TO_NONE;
8541 		else
8542 			lease_change_type = OPLOCK_READ_TO_NONE;
8543 		ksmbd_debug(OPLOCK, "handle bad lease state 0x%x -> 0x%x\n",
8544 			    le32_to_cpu(lease->state),
8545 			    le32_to_cpu(req->LeaseState));
8546 	} else if (lease->state == SMB2_LEASE_READ_CACHING_LE &&
8547 		   req->LeaseState != SMB2_LEASE_NONE_LE) {
8548 		err = STATUS_INVALID_OPLOCK_PROTOCOL;
8549 		lease_change_type = OPLOCK_READ_TO_NONE;
8550 		ksmbd_debug(OPLOCK, "handle bad lease state 0x%x -> 0x%x\n",
8551 			    le32_to_cpu(lease->state),
8552 			    le32_to_cpu(req->LeaseState));
8553 	} else {
8554 		/* valid lease state changes */
8555 		err = STATUS_INVALID_DEVICE_STATE;
8556 		if (req->LeaseState == SMB2_LEASE_NONE_LE) {
8557 			if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
8558 				lease_change_type = OPLOCK_WRITE_TO_NONE;
8559 			else
8560 				lease_change_type = OPLOCK_READ_TO_NONE;
8561 		} else if (req->LeaseState & SMB2_LEASE_READ_CACHING_LE) {
8562 			if (lease->state & SMB2_LEASE_WRITE_CACHING_LE)
8563 				lease_change_type = OPLOCK_WRITE_TO_READ;
8564 			else
8565 				lease_change_type = OPLOCK_READ_HANDLE_TO_READ;
8566 		} else {
8567 			lease_change_type = 0;
8568 		}
8569 	}
8570 
8571 	switch (lease_change_type) {
8572 	case OPLOCK_WRITE_TO_READ:
8573 		ret = opinfo_write_to_read(opinfo);
8574 		break;
8575 	case OPLOCK_READ_HANDLE_TO_READ:
8576 		ret = opinfo_read_handle_to_read(opinfo);
8577 		break;
8578 	case OPLOCK_WRITE_TO_NONE:
8579 		ret = opinfo_write_to_none(opinfo);
8580 		break;
8581 	case OPLOCK_READ_TO_NONE:
8582 		ret = opinfo_read_to_none(opinfo);
8583 		break;
8584 	default:
8585 		ksmbd_debug(OPLOCK, "unknown lease change 0x%x -> 0x%x\n",
8586 			    le32_to_cpu(lease->state),
8587 			    le32_to_cpu(req->LeaseState));
8588 	}
8589 
8590 	if (ret < 0) {
8591 		rsp->hdr.Status = err;
8592 		goto err_out;
8593 	}
8594 
8595 	lease_state = lease->state;
8596 	opinfo->op_state = OPLOCK_STATE_NONE;
8597 	wake_up_interruptible_all(&opinfo->oplock_q);
8598 	atomic_dec(&opinfo->breaking_cnt);
8599 	wake_up_interruptible_all(&opinfo->oplock_brk);
8600 	opinfo_put(opinfo);
8601 
8602 	rsp->StructureSize = cpu_to_le16(36);
8603 	rsp->Reserved = 0;
8604 	rsp->Flags = 0;
8605 	memcpy(rsp->LeaseKey, req->LeaseKey, 16);
8606 	rsp->LeaseState = lease_state;
8607 	rsp->LeaseDuration = 0;
8608 	ret = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_lease_ack));
8609 	if (!ret)
8610 		return;
8611 
8612 err_out:
8613 	wake_up_interruptible_all(&opinfo->oplock_q);
8614 	atomic_dec(&opinfo->breaking_cnt);
8615 	wake_up_interruptible_all(&opinfo->oplock_brk);
8616 
8617 	opinfo_put(opinfo);
8618 	smb2_set_err_rsp(work);
8619 }
8620 
8621 /**
8622  * smb2_oplock_break() - dispatcher for smb2.0 and 2.1 oplock/lease break
8623  * @work:	smb work containing oplock/lease break command buffer
8624  *
8625  * Return:	0
8626  */
smb2_oplock_break(struct ksmbd_work * work)8627 int smb2_oplock_break(struct ksmbd_work *work)
8628 {
8629 	struct smb2_oplock_break *req;
8630 	struct smb2_oplock_break *rsp;
8631 
8632 	ksmbd_debug(SMB, "Received smb2 oplock break acknowledgment request\n");
8633 
8634 	WORK_BUFFERS(work, req, rsp);
8635 
8636 	switch (le16_to_cpu(req->StructureSize)) {
8637 	case OP_BREAK_STRUCT_SIZE_20:
8638 		smb20_oplock_break_ack(work);
8639 		break;
8640 	case OP_BREAK_STRUCT_SIZE_21:
8641 		smb21_lease_break_ack(work);
8642 		break;
8643 	default:
8644 		ksmbd_debug(OPLOCK, "invalid break cmd %d\n",
8645 			    le16_to_cpu(req->StructureSize));
8646 		rsp->hdr.Status = STATUS_INVALID_PARAMETER;
8647 		smb2_set_err_rsp(work);
8648 	}
8649 
8650 	return 0;
8651 }
8652 
8653 /**
8654  * smb2_notify() - handler for smb2 notify request
8655  * @work:   smb work containing notify command buffer
8656  *
8657  * Return:      0
8658  */
smb2_notify(struct ksmbd_work * work)8659 int smb2_notify(struct ksmbd_work *work)
8660 {
8661 	struct smb2_change_notify_req *req;
8662 	struct smb2_change_notify_rsp *rsp;
8663 
8664 	ksmbd_debug(SMB, "Received smb2 notify\n");
8665 
8666 	WORK_BUFFERS(work, req, rsp);
8667 
8668 	if (work->next_smb2_rcv_hdr_off && req->hdr.NextCommand) {
8669 		rsp->hdr.Status = STATUS_INTERNAL_ERROR;
8670 		smb2_set_err_rsp(work);
8671 		return 0;
8672 	}
8673 
8674 	smb2_set_err_rsp(work);
8675 	rsp->hdr.Status = STATUS_NOT_IMPLEMENTED;
8676 	return 0;
8677 }
8678 
8679 /**
8680  * smb2_is_sign_req() - handler for checking packet signing status
8681  * @work:	smb work containing notify command buffer
8682  * @command:	SMB2 command id
8683  *
8684  * Return:	true if packed is signed, false otherwise
8685  */
smb2_is_sign_req(struct ksmbd_work * work,unsigned int command)8686 bool smb2_is_sign_req(struct ksmbd_work *work, unsigned int command)
8687 {
8688 	struct smb2_hdr *rcv_hdr2 = smb2_get_msg(work->request_buf);
8689 
8690 	if ((rcv_hdr2->Flags & SMB2_FLAGS_SIGNED) &&
8691 	    command != SMB2_NEGOTIATE_HE &&
8692 	    command != SMB2_SESSION_SETUP_HE &&
8693 	    command != SMB2_OPLOCK_BREAK_HE)
8694 		return true;
8695 
8696 	return false;
8697 }
8698 
8699 /**
8700  * smb2_check_sign_req() - handler for req packet sign processing
8701  * @work:   smb work containing notify command buffer
8702  *
8703  * Return:	1 on success, 0 otherwise
8704  */
smb2_check_sign_req(struct ksmbd_work * work)8705 int smb2_check_sign_req(struct ksmbd_work *work)
8706 {
8707 	struct smb2_hdr *hdr;
8708 	char signature_req[SMB2_SIGNATURE_SIZE];
8709 	char signature[SMB2_HMACSHA256_SIZE];
8710 	struct kvec iov[1];
8711 	size_t len;
8712 
8713 	hdr = smb2_get_msg(work->request_buf);
8714 	if (work->next_smb2_rcv_hdr_off)
8715 		hdr = ksmbd_req_buf_next(work);
8716 
8717 	if (!hdr->NextCommand && !work->next_smb2_rcv_hdr_off)
8718 		len = get_rfc1002_len(work->request_buf);
8719 	else if (hdr->NextCommand)
8720 		len = le32_to_cpu(hdr->NextCommand);
8721 	else
8722 		len = get_rfc1002_len(work->request_buf) -
8723 			work->next_smb2_rcv_hdr_off;
8724 
8725 	memcpy(signature_req, hdr->Signature, SMB2_SIGNATURE_SIZE);
8726 	memset(hdr->Signature, 0, SMB2_SIGNATURE_SIZE);
8727 
8728 	iov[0].iov_base = (char *)&hdr->ProtocolId;
8729 	iov[0].iov_len = len;
8730 
8731 	if (ksmbd_sign_smb2_pdu(work->conn, work->sess->sess_key, iov, 1,
8732 				signature))
8733 		return 0;
8734 
8735 	if (memcmp(signature, signature_req, SMB2_SIGNATURE_SIZE)) {
8736 		pr_err("bad smb2 signature\n");
8737 		return 0;
8738 	}
8739 
8740 	return 1;
8741 }
8742 
8743 /**
8744  * smb2_set_sign_rsp() - handler for rsp packet sign processing
8745  * @work:   smb work containing notify command buffer
8746  *
8747  */
smb2_set_sign_rsp(struct ksmbd_work * work)8748 void smb2_set_sign_rsp(struct ksmbd_work *work)
8749 {
8750 	struct smb2_hdr *hdr;
8751 	char signature[SMB2_HMACSHA256_SIZE];
8752 	struct kvec *iov;
8753 	int n_vec = 1;
8754 
8755 	hdr = ksmbd_resp_buf_curr(work);
8756 	hdr->Flags |= SMB2_FLAGS_SIGNED;
8757 	memset(hdr->Signature, 0, SMB2_SIGNATURE_SIZE);
8758 
8759 	if (hdr->Command == SMB2_READ) {
8760 		iov = &work->iov[work->iov_idx - 1];
8761 		n_vec++;
8762 	} else {
8763 		iov = &work->iov[work->iov_idx];
8764 	}
8765 
8766 	if (!ksmbd_sign_smb2_pdu(work->conn, work->sess->sess_key, iov, n_vec,
8767 				 signature))
8768 		memcpy(hdr->Signature, signature, SMB2_SIGNATURE_SIZE);
8769 }
8770 
8771 /**
8772  * smb3_check_sign_req() - handler for req packet sign processing
8773  * @work:   smb work containing notify command buffer
8774  *
8775  * Return:	1 on success, 0 otherwise
8776  */
smb3_check_sign_req(struct ksmbd_work * work)8777 int smb3_check_sign_req(struct ksmbd_work *work)
8778 {
8779 	struct ksmbd_conn *conn = work->conn;
8780 	char *signing_key;
8781 	struct smb2_hdr *hdr;
8782 	struct channel *chann;
8783 	char signature_req[SMB2_SIGNATURE_SIZE];
8784 	char signature[SMB2_CMACAES_SIZE];
8785 	struct kvec iov[1];
8786 	size_t len;
8787 
8788 	hdr = smb2_get_msg(work->request_buf);
8789 	if (work->next_smb2_rcv_hdr_off)
8790 		hdr = ksmbd_req_buf_next(work);
8791 
8792 	if (!hdr->NextCommand && !work->next_smb2_rcv_hdr_off)
8793 		len = get_rfc1002_len(work->request_buf);
8794 	else if (hdr->NextCommand)
8795 		len = le32_to_cpu(hdr->NextCommand);
8796 	else
8797 		len = get_rfc1002_len(work->request_buf) -
8798 			work->next_smb2_rcv_hdr_off;
8799 
8800 	if (le16_to_cpu(hdr->Command) == SMB2_SESSION_SETUP_HE) {
8801 		signing_key = work->sess->smb3signingkey;
8802 	} else {
8803 		chann = lookup_chann_list(work->sess, conn);
8804 		if (!chann) {
8805 			return 0;
8806 		}
8807 		signing_key = chann->smb3signingkey;
8808 	}
8809 
8810 	if (!signing_key) {
8811 		pr_err("SMB3 signing key is not generated\n");
8812 		return 0;
8813 	}
8814 
8815 	memcpy(signature_req, hdr->Signature, SMB2_SIGNATURE_SIZE);
8816 	memset(hdr->Signature, 0, SMB2_SIGNATURE_SIZE);
8817 	iov[0].iov_base = (char *)&hdr->ProtocolId;
8818 	iov[0].iov_len = len;
8819 
8820 	if (ksmbd_sign_smb3_pdu(conn, signing_key, iov, 1, signature))
8821 		return 0;
8822 
8823 	if (memcmp(signature, signature_req, SMB2_SIGNATURE_SIZE)) {
8824 		pr_err("bad smb2 signature\n");
8825 		return 0;
8826 	}
8827 
8828 	return 1;
8829 }
8830 
8831 /**
8832  * smb3_set_sign_rsp() - handler for rsp packet sign processing
8833  * @work:   smb work containing notify command buffer
8834  *
8835  */
smb3_set_sign_rsp(struct ksmbd_work * work)8836 void smb3_set_sign_rsp(struct ksmbd_work *work)
8837 {
8838 	struct ksmbd_conn *conn = work->conn;
8839 	struct smb2_hdr *hdr;
8840 	struct channel *chann;
8841 	char signature[SMB2_CMACAES_SIZE];
8842 	struct kvec *iov;
8843 	int n_vec = 1;
8844 	char *signing_key;
8845 
8846 	hdr = ksmbd_resp_buf_curr(work);
8847 
8848 	if (conn->binding == false &&
8849 	    le16_to_cpu(hdr->Command) == SMB2_SESSION_SETUP_HE) {
8850 		signing_key = work->sess->smb3signingkey;
8851 	} else {
8852 		chann = lookup_chann_list(work->sess, work->conn);
8853 		if (!chann) {
8854 			return;
8855 		}
8856 		signing_key = chann->smb3signingkey;
8857 	}
8858 
8859 	if (!signing_key)
8860 		return;
8861 
8862 	hdr->Flags |= SMB2_FLAGS_SIGNED;
8863 	memset(hdr->Signature, 0, SMB2_SIGNATURE_SIZE);
8864 
8865 	if (hdr->Command == SMB2_READ) {
8866 		iov = &work->iov[work->iov_idx - 1];
8867 		n_vec++;
8868 	} else {
8869 		iov = &work->iov[work->iov_idx];
8870 	}
8871 
8872 	if (!ksmbd_sign_smb3_pdu(conn, signing_key, iov, n_vec,
8873 				 signature))
8874 		memcpy(hdr->Signature, signature, SMB2_SIGNATURE_SIZE);
8875 }
8876 
8877 /**
8878  * smb3_preauth_hash_rsp() - handler for computing preauth hash on response
8879  * @work:   smb work containing response buffer
8880  *
8881  */
smb3_preauth_hash_rsp(struct ksmbd_work * work)8882 void smb3_preauth_hash_rsp(struct ksmbd_work *work)
8883 {
8884 	struct ksmbd_conn *conn = work->conn;
8885 	struct ksmbd_session *sess = work->sess;
8886 	struct smb2_hdr *req, *rsp;
8887 
8888 	if (conn->dialect != SMB311_PROT_ID)
8889 		return;
8890 
8891 	WORK_BUFFERS(work, req, rsp);
8892 
8893 	if (le16_to_cpu(req->Command) == SMB2_NEGOTIATE_HE &&
8894 	    conn->preauth_info)
8895 		ksmbd_gen_preauth_integrity_hash(conn, work->response_buf,
8896 						 conn->preauth_info->Preauth_HashValue);
8897 
8898 	if (le16_to_cpu(rsp->Command) == SMB2_SESSION_SETUP_HE && sess) {
8899 		__u8 *hash_value;
8900 
8901 		if (conn->binding) {
8902 			struct preauth_session *preauth_sess;
8903 
8904 			preauth_sess = ksmbd_preauth_session_lookup(conn, sess->id);
8905 			if (!preauth_sess)
8906 				return;
8907 			hash_value = preauth_sess->Preauth_HashValue;
8908 		} else {
8909 			hash_value = sess->Preauth_HashValue;
8910 			if (!hash_value)
8911 				return;
8912 		}
8913 		ksmbd_gen_preauth_integrity_hash(conn, work->response_buf,
8914 						 hash_value);
8915 	}
8916 }
8917 
fill_transform_hdr(void * tr_buf,char * old_buf,__le16 cipher_type)8918 static void fill_transform_hdr(void *tr_buf, char *old_buf, __le16 cipher_type)
8919 {
8920 	struct smb2_transform_hdr *tr_hdr = tr_buf + 4;
8921 	struct smb2_hdr *hdr = smb2_get_msg(old_buf);
8922 	unsigned int orig_len = get_rfc1002_len(old_buf);
8923 
8924 	/* tr_buf must be cleared by the caller */
8925 	tr_hdr->ProtocolId = SMB2_TRANSFORM_PROTO_NUM;
8926 	tr_hdr->OriginalMessageSize = cpu_to_le32(orig_len);
8927 	tr_hdr->Flags = cpu_to_le16(TRANSFORM_FLAG_ENCRYPTED);
8928 	if (cipher_type == SMB2_ENCRYPTION_AES128_GCM ||
8929 	    cipher_type == SMB2_ENCRYPTION_AES256_GCM)
8930 		get_random_bytes(&tr_hdr->Nonce, SMB3_AES_GCM_NONCE);
8931 	else
8932 		get_random_bytes(&tr_hdr->Nonce, SMB3_AES_CCM_NONCE);
8933 	memcpy(&tr_hdr->SessionId, &hdr->SessionId, 8);
8934 	inc_rfc1001_len(tr_buf, sizeof(struct smb2_transform_hdr));
8935 	inc_rfc1001_len(tr_buf, orig_len);
8936 }
8937 
smb3_encrypt_resp(struct ksmbd_work * work)8938 int smb3_encrypt_resp(struct ksmbd_work *work)
8939 {
8940 	struct kvec *iov = work->iov;
8941 	int rc = -ENOMEM;
8942 	void *tr_buf;
8943 
8944 	tr_buf = kzalloc(sizeof(struct smb2_transform_hdr) + 4, KSMBD_DEFAULT_GFP);
8945 	if (!tr_buf)
8946 		return rc;
8947 
8948 	/* fill transform header */
8949 	fill_transform_hdr(tr_buf, work->response_buf, work->conn->cipher_type);
8950 
8951 	iov[0].iov_base = tr_buf;
8952 	iov[0].iov_len = sizeof(struct smb2_transform_hdr) + 4;
8953 	work->tr_buf = tr_buf;
8954 
8955 	return ksmbd_crypt_message(work, iov, work->iov_idx + 1, 1);
8956 }
8957 
smb3_is_transform_hdr(void * buf)8958 bool smb3_is_transform_hdr(void *buf)
8959 {
8960 	struct smb2_transform_hdr *trhdr = smb2_get_msg(buf);
8961 
8962 	return trhdr->ProtocolId == SMB2_TRANSFORM_PROTO_NUM;
8963 }
8964 
smb3_decrypt_req(struct ksmbd_work * work)8965 int smb3_decrypt_req(struct ksmbd_work *work)
8966 {
8967 	struct ksmbd_session *sess;
8968 	char *buf = work->request_buf;
8969 	unsigned int pdu_length = get_rfc1002_len(buf);
8970 	struct kvec iov[2];
8971 	int buf_data_size = pdu_length - sizeof(struct smb2_transform_hdr);
8972 	struct smb2_transform_hdr *tr_hdr = smb2_get_msg(buf);
8973 	int rc = 0;
8974 
8975 	if (pdu_length < sizeof(struct smb2_transform_hdr) ||
8976 	    buf_data_size < sizeof(struct smb2_hdr)) {
8977 		pr_err("Transform message is too small (%u)\n",
8978 		       pdu_length);
8979 		return -ECONNABORTED;
8980 	}
8981 
8982 	if (buf_data_size < le32_to_cpu(tr_hdr->OriginalMessageSize)) {
8983 		pr_err("Transform message is broken\n");
8984 		return -ECONNABORTED;
8985 	}
8986 
8987 	sess = ksmbd_session_lookup_all(work->conn, le64_to_cpu(tr_hdr->SessionId));
8988 	if (!sess) {
8989 		pr_err("invalid session id(%llx) in transform header\n",
8990 		       le64_to_cpu(tr_hdr->SessionId));
8991 		return -ECONNABORTED;
8992 	}
8993 	ksmbd_user_session_put(sess);
8994 
8995 	iov[0].iov_base = buf;
8996 	iov[0].iov_len = sizeof(struct smb2_transform_hdr) + 4;
8997 	iov[1].iov_base = buf + sizeof(struct smb2_transform_hdr) + 4;
8998 	iov[1].iov_len = buf_data_size;
8999 	rc = ksmbd_crypt_message(work, iov, 2, 0);
9000 	if (rc)
9001 		return rc;
9002 
9003 	memmove(buf + 4, iov[1].iov_base, buf_data_size);
9004 	*(__be32 *)buf = cpu_to_be32(buf_data_size);
9005 
9006 	return rc;
9007 }
9008 
smb3_11_final_sess_setup_resp(struct ksmbd_work * work)9009 bool smb3_11_final_sess_setup_resp(struct ksmbd_work *work)
9010 {
9011 	struct ksmbd_conn *conn = work->conn;
9012 	struct ksmbd_session *sess = work->sess;
9013 	struct smb2_hdr *rsp = smb2_get_msg(work->response_buf);
9014 
9015 	if (conn->dialect < SMB30_PROT_ID)
9016 		return false;
9017 
9018 	if (work->next_smb2_rcv_hdr_off)
9019 		rsp = ksmbd_resp_buf_next(work);
9020 
9021 	if (le16_to_cpu(rsp->Command) == SMB2_SESSION_SETUP_HE &&
9022 	    sess->user && !user_guest(sess->user) &&
9023 	    rsp->Status == STATUS_SUCCESS)
9024 		return true;
9025 	return false;
9026 }
9027