xref: /linux/fs/smb/client/cifs_debug.c (revision 6d9b262afe0ec1d6e0ef99321ca9d6b921310471)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *
4  *   Copyright (C) International Business Machines  Corp., 2000,2005
5  *
6  *   Modified by Steve French (sfrench@us.ibm.com)
7  */
8 #include <linux/fs.h>
9 #include <linux/string.h>
10 #include <linux/ctype.h>
11 #include <linux/kstrtox.h>
12 #include <linux/module.h>
13 #include <linux/proc_fs.h>
14 #include <linux/uaccess.h>
15 #include <uapi/linux/ethtool.h>
16 #include "cifspdu.h"
17 #include "cifsglob.h"
18 #include "cifsproto.h"
19 #include "cifs_debug.h"
20 #include "cifsfs.h"
21 #include "fs_context.h"
22 #ifdef CONFIG_CIFS_DFS_UPCALL
23 #include "dfs_cache.h"
24 #endif
25 #ifdef CONFIG_CIFS_SMB_DIRECT
26 #include "smbdirect.h"
27 #endif
28 #include "cifs_swn.h"
29 
30 void
31 cifs_dump_mem(char *label, void *data, int length)
32 {
33 	pr_debug("%s: dump of %d bytes of data at 0x%p\n", label, length, data);
34 	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 4,
35 		       data, length, true);
36 }
37 
38 void cifs_dump_detail(void *buf, struct TCP_Server_Info *server)
39 {
40 #ifdef CONFIG_CIFS_DEBUG2
41 	struct smb_hdr *smb = buf;
42 
43 	cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d Wct: %d\n",
44 		 smb->Command, smb->Status.CifsError, smb->Flags,
45 		 smb->Flags2, smb->Mid, smb->Pid, smb->WordCount);
46 	if (!server->ops->check_message(buf, server->total_read, server)) {
47 		cifs_dbg(VFS, "smb buf %p len %u\n", smb,
48 			 server->ops->calc_smb_size(smb));
49 	}
50 #endif /* CONFIG_CIFS_DEBUG2 */
51 }
52 
53 void cifs_dump_mids(struct TCP_Server_Info *server)
54 {
55 #ifdef CONFIG_CIFS_DEBUG2
56 	struct mid_q_entry *mid_entry;
57 
58 	if (server == NULL)
59 		return;
60 
61 	cifs_dbg(VFS, "Dump pending requests:\n");
62 	spin_lock(&server->mid_lock);
63 	list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
64 		cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
65 			 mid_entry->mid_state,
66 			 le16_to_cpu(mid_entry->command),
67 			 mid_entry->pid,
68 			 mid_entry->callback_data,
69 			 mid_entry->mid);
70 #ifdef CONFIG_CIFS_STATS2
71 		cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
72 			 mid_entry->large_buf,
73 			 mid_entry->resp_buf,
74 			 mid_entry->when_received,
75 			 jiffies);
76 #endif /* STATS2 */
77 		cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
78 			 mid_entry->multiRsp, mid_entry->multiEnd);
79 		if (mid_entry->resp_buf) {
80 			cifs_dump_detail(mid_entry->resp_buf, server);
81 			cifs_dump_mem("existing buf: ",
82 				mid_entry->resp_buf, 62);
83 		}
84 	}
85 	spin_unlock(&server->mid_lock);
86 #endif /* CONFIG_CIFS_DEBUG2 */
87 }
88 
89 #ifdef CONFIG_PROC_FS
90 static void cifs_debug_tcon(struct seq_file *m, struct cifs_tcon *tcon)
91 {
92 	__u32 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
93 
94 	seq_printf(m, "%s Mounts: %d ", tcon->tree_name, tcon->tc_count);
95 	if (tcon->nativeFileSystem)
96 		seq_printf(m, "Type: %s ", tcon->nativeFileSystem);
97 	seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x\n\tPathComponentMax: %d Status: %d",
98 		   le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
99 		   le32_to_cpu(tcon->fsAttrInfo.Attributes),
100 		   le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
101 		   tcon->status);
102 	if (dev_type == FILE_DEVICE_DISK)
103 		seq_puts(m, " type: DISK ");
104 	else if (dev_type == FILE_DEVICE_CD_ROM)
105 		seq_puts(m, " type: CDROM ");
106 	else
107 		seq_printf(m, " type: %d ", dev_type);
108 
109 	seq_printf(m, "Serial Number: 0x%x", tcon->vol_serial_number);
110 
111 	if ((tcon->seal) ||
112 	    (tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
113 	    (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
114 		seq_puts(m, " encrypted");
115 	if (tcon->nocase)
116 		seq_printf(m, " nocase");
117 	if (tcon->unix_ext)
118 		seq_printf(m, " POSIX Extensions");
119 	if (tcon->ses->server->ops->dump_share_caps)
120 		tcon->ses->server->ops->dump_share_caps(m, tcon);
121 	if (tcon->use_witness)
122 		seq_puts(m, " Witness");
123 	if (tcon->broken_sparse_sup)
124 		seq_puts(m, " nosparse");
125 	if (tcon->need_reconnect)
126 		seq_puts(m, "\tDISCONNECTED ");
127 	spin_lock(&tcon->tc_lock);
128 	if (tcon->origin_fullpath) {
129 		seq_printf(m, "\n\tDFS origin fullpath: %s",
130 			   tcon->origin_fullpath);
131 	}
132 	spin_unlock(&tcon->tc_lock);
133 	seq_putc(m, '\n');
134 }
135 
136 static void
137 cifs_dump_channel(struct seq_file *m, int i, struct cifs_chan *chan)
138 {
139 	struct TCP_Server_Info *server = chan->server;
140 
141 	if (!server) {
142 		seq_printf(m, "\n\n\t\tChannel: %d DISABLED", i+1);
143 		return;
144 	}
145 
146 	seq_printf(m, "\n\n\t\tChannel: %d ConnectionId: 0x%llx"
147 		   "\n\t\tNumber of credits: %d,%d,%d Dialect 0x%x"
148 		   "\n\t\tTCP status: %d Instance: %d"
149 		   "\n\t\tLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d"
150 		   "\n\t\tIn Send: %d In MaxReq Wait: %d",
151 		   i+1, server->conn_id,
152 		   server->credits,
153 		   server->echo_credits,
154 		   server->oplock_credits,
155 		   server->dialect,
156 		   server->tcpStatus,
157 		   server->reconnect_instance,
158 		   server->srv_count,
159 		   server->sec_mode,
160 		   in_flight(server),
161 		   atomic_read(&server->in_send),
162 		   atomic_read(&server->num_waiters));
163 #ifdef CONFIG_NET_NS
164 	if (server->net)
165 		seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
166 #endif /* NET_NS */
167 
168 }
169 
170 static inline const char *smb_speed_to_str(size_t bps)
171 {
172 	size_t mbps = bps / 1000 / 1000;
173 
174 	switch (mbps) {
175 	case SPEED_10:
176 		return "10Mbps";
177 	case SPEED_100:
178 		return "100Mbps";
179 	case SPEED_1000:
180 		return "1Gbps";
181 	case SPEED_2500:
182 		return "2.5Gbps";
183 	case SPEED_5000:
184 		return "5Gbps";
185 	case SPEED_10000:
186 		return "10Gbps";
187 	case SPEED_14000:
188 		return "14Gbps";
189 	case SPEED_20000:
190 		return "20Gbps";
191 	case SPEED_25000:
192 		return "25Gbps";
193 	case SPEED_40000:
194 		return "40Gbps";
195 	case SPEED_50000:
196 		return "50Gbps";
197 	case SPEED_56000:
198 		return "56Gbps";
199 	case SPEED_100000:
200 		return "100Gbps";
201 	case SPEED_200000:
202 		return "200Gbps";
203 	case SPEED_400000:
204 		return "400Gbps";
205 	case SPEED_800000:
206 		return "800Gbps";
207 	default:
208 		return "Unknown";
209 	}
210 }
211 
212 static void
213 cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
214 {
215 	struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
216 	struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
217 
218 	seq_printf(m, "\tSpeed: %s\n", smb_speed_to_str(iface->speed));
219 	seq_puts(m, "\t\tCapabilities: ");
220 	if (iface->rdma_capable)
221 		seq_puts(m, "rdma ");
222 	if (iface->rss_capable)
223 		seq_puts(m, "rss ");
224 	if (!iface->rdma_capable && !iface->rss_capable)
225 		seq_puts(m, "None");
226 	seq_putc(m, '\n');
227 	if (iface->sockaddr.ss_family == AF_INET)
228 		seq_printf(m, "\t\tIPv4: %pI4\n", &ipv4->sin_addr);
229 	else if (iface->sockaddr.ss_family == AF_INET6)
230 		seq_printf(m, "\t\tIPv6: %pI6\n", &ipv6->sin6_addr);
231 	if (!iface->is_active)
232 		seq_puts(m, "\t\t[for-cleanup]\n");
233 }
234 
235 static int cifs_debug_files_proc_show(struct seq_file *m, void *v)
236 {
237 	struct TCP_Server_Info *server;
238 	struct cifs_ses *ses;
239 	struct cifs_tcon *tcon;
240 	struct cifsFileInfo *cfile;
241 
242 	seq_puts(m, "# Version:1\n");
243 	seq_puts(m, "# Format:\n");
244 	seq_puts(m, "# <tree id> <ses id> <persistent fid> <flags> <count> <pid> <uid>");
245 #ifdef CONFIG_CIFS_DEBUG2
246 	seq_printf(m, " <filename> <mid>\n");
247 #else
248 	seq_printf(m, " <filename>\n");
249 #endif /* CIFS_DEBUG2 */
250 	spin_lock(&cifs_tcp_ses_lock);
251 	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
252 		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
253 			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
254 				spin_lock(&tcon->open_file_lock);
255 				list_for_each_entry(cfile, &tcon->openFileList, tlist) {
256 					seq_printf(m,
257 						"0x%x 0x%llx 0x%llx 0x%x %d %d %d %pd",
258 						tcon->tid,
259 						ses->Suid,
260 						cfile->fid.persistent_fid,
261 						cfile->f_flags,
262 						cfile->count,
263 						cfile->pid,
264 						from_kuid(&init_user_ns, cfile->uid),
265 						cfile->dentry);
266 #ifdef CONFIG_CIFS_DEBUG2
267 					seq_printf(m, " %llu\n", cfile->fid.mid);
268 #else
269 					seq_printf(m, "\n");
270 #endif /* CIFS_DEBUG2 */
271 				}
272 				spin_unlock(&tcon->open_file_lock);
273 			}
274 		}
275 	}
276 	spin_unlock(&cifs_tcp_ses_lock);
277 	seq_putc(m, '\n');
278 	return 0;
279 }
280 
281 static __always_inline const char *compression_alg_str(__le16 alg)
282 {
283 	switch (alg) {
284 	case SMB3_COMPRESS_NONE:
285 		return "NONE";
286 	case SMB3_COMPRESS_LZNT1:
287 		return "LZNT1";
288 	case SMB3_COMPRESS_LZ77:
289 		return "LZ77";
290 	case SMB3_COMPRESS_LZ77_HUFF:
291 		return "LZ77-Huffman";
292 	case SMB3_COMPRESS_PATTERN:
293 		return "Pattern_V1";
294 	default:
295 		return "invalid";
296 	}
297 }
298 
299 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
300 {
301 	struct mid_q_entry *mid_entry;
302 	struct TCP_Server_Info *server;
303 	struct TCP_Server_Info *chan_server;
304 	struct cifs_ses *ses;
305 	struct cifs_tcon *tcon;
306 	struct cifs_server_iface *iface;
307 	size_t iface_weight = 0, iface_min_speed = 0;
308 	struct cifs_server_iface *last_iface = NULL;
309 	int c, i, j;
310 
311 	seq_puts(m,
312 		    "Display Internal CIFS Data Structures for Debugging\n"
313 		    "---------------------------------------------------\n");
314 	seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
315 	seq_printf(m, "Features:");
316 #ifdef CONFIG_CIFS_DFS_UPCALL
317 	seq_printf(m, " DFS");
318 #endif
319 #ifdef CONFIG_CIFS_FSCACHE
320 	seq_printf(m, ",FSCACHE");
321 #endif
322 #ifdef CONFIG_CIFS_SMB_DIRECT
323 	seq_printf(m, ",SMB_DIRECT");
324 #endif
325 #ifdef CONFIG_CIFS_STATS2
326 	seq_printf(m, ",STATS2");
327 #else
328 	seq_printf(m, ",STATS");
329 #endif
330 #ifdef CONFIG_CIFS_DEBUG2
331 	seq_printf(m, ",DEBUG2");
332 #elif defined(CONFIG_CIFS_DEBUG)
333 	seq_printf(m, ",DEBUG");
334 #endif
335 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
336 	seq_printf(m, ",ALLOW_INSECURE_LEGACY");
337 #endif
338 #ifdef CONFIG_CIFS_POSIX
339 	seq_printf(m, ",CIFS_POSIX");
340 #endif
341 #ifdef CONFIG_CIFS_UPCALL
342 	seq_printf(m, ",UPCALL(SPNEGO)");
343 #endif
344 #ifdef CONFIG_CIFS_XATTR
345 	seq_printf(m, ",XATTR");
346 #endif
347 	seq_printf(m, ",ACL");
348 #ifdef CONFIG_CIFS_SWN_UPCALL
349 	seq_puts(m, ",WITNESS");
350 #endif
351 	seq_putc(m, '\n');
352 	seq_printf(m, "CIFSMaxBufSize: %d\n", CIFSMaxBufSize);
353 	seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
354 
355 	seq_printf(m, "\nServers: ");
356 
357 	c = 0;
358 	spin_lock(&cifs_tcp_ses_lock);
359 	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
360 		/* channel info will be printed as a part of sessions below */
361 		if (SERVER_IS_CHAN(server))
362 			continue;
363 
364 		c++;
365 		seq_printf(m, "\n%d) ConnectionId: 0x%llx ",
366 			c, server->conn_id);
367 
368 		spin_lock(&server->srv_lock);
369 		if (server->hostname)
370 			seq_printf(m, "Hostname: %s ", server->hostname);
371 		seq_printf(m, "\nClientGUID: %pUL", server->client_guid);
372 		spin_unlock(&server->srv_lock);
373 #ifdef CONFIG_CIFS_SMB_DIRECT
374 		if (!server->rdma)
375 			goto skip_rdma;
376 
377 		if (!server->smbd_conn) {
378 			seq_printf(m, "\nSMBDirect transport not available");
379 			goto skip_rdma;
380 		}
381 
382 		seq_printf(m, "\nSMBDirect (in hex) protocol version: %x "
383 			"transport status: %x",
384 			server->smbd_conn->protocol,
385 			server->smbd_conn->transport_status);
386 		seq_printf(m, "\nConn receive_credit_max: %x "
387 			"send_credit_target: %x max_send_size: %x",
388 			server->smbd_conn->receive_credit_max,
389 			server->smbd_conn->send_credit_target,
390 			server->smbd_conn->max_send_size);
391 		seq_printf(m, "\nConn max_fragmented_recv_size: %x "
392 			"max_fragmented_send_size: %x max_receive_size:%x",
393 			server->smbd_conn->max_fragmented_recv_size,
394 			server->smbd_conn->max_fragmented_send_size,
395 			server->smbd_conn->max_receive_size);
396 		seq_printf(m, "\nConn keep_alive_interval: %x "
397 			"max_readwrite_size: %x rdma_readwrite_threshold: %x",
398 			server->smbd_conn->keep_alive_interval,
399 			server->smbd_conn->max_readwrite_size,
400 			server->smbd_conn->rdma_readwrite_threshold);
401 		seq_printf(m, "\nDebug count_get_receive_buffer: %x "
402 			"count_put_receive_buffer: %x count_send_empty: %x",
403 			server->smbd_conn->count_get_receive_buffer,
404 			server->smbd_conn->count_put_receive_buffer,
405 			server->smbd_conn->count_send_empty);
406 		seq_printf(m, "\nRead Queue count_reassembly_queue: %x "
407 			"count_enqueue_reassembly_queue: %x "
408 			"count_dequeue_reassembly_queue: %x "
409 			"fragment_reassembly_remaining: %x "
410 			"reassembly_data_length: %x "
411 			"reassembly_queue_length: %x",
412 			server->smbd_conn->count_reassembly_queue,
413 			server->smbd_conn->count_enqueue_reassembly_queue,
414 			server->smbd_conn->count_dequeue_reassembly_queue,
415 			server->smbd_conn->fragment_reassembly_remaining,
416 			server->smbd_conn->reassembly_data_length,
417 			server->smbd_conn->reassembly_queue_length);
418 		seq_printf(m, "\nCurrent Credits send_credits: %x "
419 			"receive_credits: %x receive_credit_target: %x",
420 			atomic_read(&server->smbd_conn->send_credits),
421 			atomic_read(&server->smbd_conn->receive_credits),
422 			server->smbd_conn->receive_credit_target);
423 		seq_printf(m, "\nPending send_pending: %x ",
424 			atomic_read(&server->smbd_conn->send_pending));
425 		seq_printf(m, "\nReceive buffers count_receive_queue: %x "
426 			"count_empty_packet_queue: %x",
427 			server->smbd_conn->count_receive_queue,
428 			server->smbd_conn->count_empty_packet_queue);
429 		seq_printf(m, "\nMR responder_resources: %x "
430 			"max_frmr_depth: %x mr_type: %x",
431 			server->smbd_conn->responder_resources,
432 			server->smbd_conn->max_frmr_depth,
433 			server->smbd_conn->mr_type);
434 		seq_printf(m, "\nMR mr_ready_count: %x mr_used_count: %x",
435 			atomic_read(&server->smbd_conn->mr_ready_count),
436 			atomic_read(&server->smbd_conn->mr_used_count));
437 skip_rdma:
438 #endif
439 		seq_printf(m, "\nNumber of credits: %d,%d,%d Dialect 0x%x",
440 			server->credits,
441 			server->echo_credits,
442 			server->oplock_credits,
443 			server->dialect);
444 		if (server->sign)
445 			seq_printf(m, " signed");
446 		if (server->posix_ext_supported)
447 			seq_printf(m, " posix");
448 		if (server->nosharesock)
449 			seq_printf(m, " nosharesock");
450 
451 		seq_printf(m, "\nServer capabilities: 0x%x", server->capabilities);
452 
453 		if (server->rdma)
454 			seq_printf(m, "\nRDMA ");
455 		seq_printf(m, "\nTCP status: %d Instance: %d"
456 				"\nLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d",
457 				server->tcpStatus,
458 				server->reconnect_instance,
459 				server->srv_count,
460 				server->sec_mode, in_flight(server));
461 #ifdef CONFIG_NET_NS
462 		if (server->net)
463 			seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
464 #endif /* NET_NS */
465 
466 		seq_printf(m, "\nIn Send: %d In MaxReq Wait: %d",
467 				atomic_read(&server->in_send),
468 				atomic_read(&server->num_waiters));
469 
470 		if (server->leaf_fullpath) {
471 			seq_printf(m, "\nDFS leaf full path: %s",
472 				   server->leaf_fullpath);
473 		}
474 
475 		seq_puts(m, "\nCompression: ");
476 		if (!server->compression.requested)
477 			seq_puts(m, "disabled on mount");
478 		else if (server->compression.enabled)
479 			seq_printf(m, "enabled (%s)", compression_alg_str(server->compression.alg));
480 		else
481 			seq_puts(m, "disabled (not supported by this server)");
482 
483 		seq_printf(m, "\n\n\tSessions: ");
484 		i = 0;
485 		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
486 			spin_lock(&ses->ses_lock);
487 			if (ses->ses_status == SES_EXITING) {
488 				spin_unlock(&ses->ses_lock);
489 				continue;
490 			}
491 			i++;
492 			if ((ses->serverDomain == NULL) ||
493 				(ses->serverOS == NULL) ||
494 				(ses->serverNOS == NULL)) {
495 				seq_printf(m, "\n\t%d) Address: %s Uses: %d Capability: 0x%x\tSession Status: %d ",
496 					i, ses->ip_addr, ses->ses_count,
497 					ses->capabilities, ses->ses_status);
498 				if (ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
499 					seq_printf(m, "Guest ");
500 				else if (ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
501 					seq_printf(m, "Anonymous ");
502 			} else {
503 				seq_printf(m,
504 				    "\n\t%d) Name: %s  Domain: %s Uses: %d OS: %s "
505 				    "\n\tNOS: %s\tCapability: 0x%x"
506 					"\n\tSMB session status: %d ",
507 				i, ses->ip_addr, ses->serverDomain,
508 				ses->ses_count, ses->serverOS, ses->serverNOS,
509 				ses->capabilities, ses->ses_status);
510 			}
511 			if (ses->expired_pwd)
512 				seq_puts(m, "password no longer valid ");
513 			spin_unlock(&ses->ses_lock);
514 
515 			seq_printf(m, "\n\tSecurity type: %s ",
516 				get_security_type_str(server->ops->select_sectype(server, ses->sectype)));
517 
518 			/* dump session id helpful for use with network trace */
519 			seq_printf(m, " SessionId: 0x%llx", ses->Suid);
520 			if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
521 				seq_puts(m, " encrypted");
522 				/* can help in debugging to show encryption type */
523 				if (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
524 					seq_puts(m, "(gcm256)");
525 			}
526 			if (ses->sign)
527 				seq_puts(m, " signed");
528 
529 			seq_printf(m, "\n\tUser: %d Cred User: %d",
530 				   from_kuid(&init_user_ns, ses->linux_uid),
531 				   from_kuid(&init_user_ns, ses->cred_uid));
532 
533 			if (ses->dfs_root_ses) {
534 				seq_printf(m, "\n\tDFS root session id: 0x%llx",
535 					   ses->dfs_root_ses->Suid);
536 			}
537 
538 			spin_lock(&ses->chan_lock);
539 			if (CIFS_CHAN_NEEDS_RECONNECT(ses, 0))
540 				seq_puts(m, "\tPrimary channel: DISCONNECTED ");
541 			if (CIFS_CHAN_IN_RECONNECT(ses, 0))
542 				seq_puts(m, "\t[RECONNECTING] ");
543 
544 			if (ses->chan_count > 1) {
545 				seq_printf(m, "\n\n\tExtra Channels: %zu ",
546 					   ses->chan_count-1);
547 				for (j = 1; j < ses->chan_count; j++) {
548 					cifs_dump_channel(m, j, &ses->chans[j]);
549 					if (CIFS_CHAN_NEEDS_RECONNECT(ses, j))
550 						seq_puts(m, "\tDISCONNECTED ");
551 					if (CIFS_CHAN_IN_RECONNECT(ses, j))
552 						seq_puts(m, "\t[RECONNECTING] ");
553 				}
554 			}
555 			spin_unlock(&ses->chan_lock);
556 
557 			seq_puts(m, "\n\n\tShares: ");
558 			j = 0;
559 
560 			seq_printf(m, "\n\t%d) IPC: ", j);
561 			if (ses->tcon_ipc)
562 				cifs_debug_tcon(m, ses->tcon_ipc);
563 			else
564 				seq_puts(m, "none\n");
565 
566 			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
567 				++j;
568 				seq_printf(m, "\n\t%d) ", j);
569 				cifs_debug_tcon(m, tcon);
570 			}
571 
572 			spin_lock(&ses->iface_lock);
573 			if (ses->iface_count)
574 				seq_printf(m, "\n\n\tServer interfaces: %zu"
575 					   "\tLast updated: %lu seconds ago",
576 					   ses->iface_count,
577 					   (jiffies - ses->iface_last_update) / HZ);
578 
579 			last_iface = list_last_entry(&ses->iface_list,
580 						     struct cifs_server_iface,
581 						     iface_head);
582 			iface_min_speed = last_iface->speed;
583 
584 			j = 0;
585 			list_for_each_entry(iface, &ses->iface_list,
586 						 iface_head) {
587 				seq_printf(m, "\n\t%d)", ++j);
588 				cifs_dump_iface(m, iface);
589 
590 				iface_weight = iface->speed / iface_min_speed;
591 				seq_printf(m, "\t\tWeight (cur,total): (%zu,%zu)"
592 					   "\n\t\tAllocated channels: %u\n",
593 					   iface->weight_fulfilled,
594 					   iface_weight,
595 					   iface->num_channels);
596 
597 				if (is_ses_using_iface(ses, iface))
598 					seq_puts(m, "\t\t[CONNECTED]\n");
599 			}
600 			spin_unlock(&ses->iface_lock);
601 
602 			seq_puts(m, "\n\n\tMIDs: ");
603 			spin_lock(&ses->chan_lock);
604 			for (j = 0; j < ses->chan_count; j++) {
605 				chan_server = ses->chans[j].server;
606 				if (!chan_server)
607 					continue;
608 
609 				if (list_empty(&chan_server->pending_mid_q))
610 					continue;
611 
612 				seq_printf(m, "\n\tServer ConnectionId: 0x%llx",
613 					   chan_server->conn_id);
614 				spin_lock(&chan_server->mid_lock);
615 				list_for_each_entry(mid_entry, &chan_server->pending_mid_q, qhead) {
616 					seq_printf(m, "\n\t\tState: %d com: %d pid: %d cbdata: %p mid %llu",
617 						   mid_entry->mid_state,
618 						   le16_to_cpu(mid_entry->command),
619 						   mid_entry->pid,
620 						   mid_entry->callback_data,
621 						   mid_entry->mid);
622 				}
623 				spin_unlock(&chan_server->mid_lock);
624 			}
625 			spin_unlock(&ses->chan_lock);
626 			seq_puts(m, "\n--\n");
627 		}
628 		if (i == 0)
629 			seq_printf(m, "\n\t\t[NONE]");
630 	}
631 	if (c == 0)
632 		seq_printf(m, "\n\t[NONE]");
633 
634 	spin_unlock(&cifs_tcp_ses_lock);
635 	seq_putc(m, '\n');
636 	cifs_swn_dump(m);
637 
638 	/* BB add code to dump additional info such as TCP session info now */
639 	return 0;
640 }
641 
642 static ssize_t cifs_stats_proc_write(struct file *file,
643 		const char __user *buffer, size_t count, loff_t *ppos)
644 {
645 	bool bv;
646 	int rc;
647 	struct TCP_Server_Info *server;
648 	struct cifs_ses *ses;
649 	struct cifs_tcon *tcon;
650 
651 	rc = kstrtobool_from_user(buffer, count, &bv);
652 	if (rc == 0) {
653 #ifdef CONFIG_CIFS_STATS2
654 		int i;
655 
656 		atomic_set(&total_buf_alloc_count, 0);
657 		atomic_set(&total_small_buf_alloc_count, 0);
658 #endif /* CONFIG_CIFS_STATS2 */
659 		atomic_set(&tcpSesReconnectCount, 0);
660 		atomic_set(&tconInfoReconnectCount, 0);
661 
662 		spin_lock(&GlobalMid_Lock);
663 		GlobalMaxActiveXid = 0;
664 		GlobalCurrentXid = 0;
665 		spin_unlock(&GlobalMid_Lock);
666 		spin_lock(&cifs_tcp_ses_lock);
667 		list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
668 			server->max_in_flight = 0;
669 #ifdef CONFIG_CIFS_STATS2
670 			for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
671 				atomic_set(&server->num_cmds[i], 0);
672 				atomic_set(&server->smb2slowcmd[i], 0);
673 				server->time_per_cmd[i] = 0;
674 				server->slowest_cmd[i] = 0;
675 				server->fastest_cmd[0] = 0;
676 			}
677 #endif /* CONFIG_CIFS_STATS2 */
678 			list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
679 				list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
680 					atomic_set(&tcon->num_smbs_sent, 0);
681 					spin_lock(&tcon->stat_lock);
682 					tcon->bytes_read = 0;
683 					tcon->bytes_written = 0;
684 					tcon->stats_from_time = ktime_get_real_seconds();
685 					spin_unlock(&tcon->stat_lock);
686 					if (server->ops->clear_stats)
687 						server->ops->clear_stats(tcon);
688 				}
689 			}
690 		}
691 		spin_unlock(&cifs_tcp_ses_lock);
692 	} else {
693 		return rc;
694 	}
695 
696 	return count;
697 }
698 
699 static int cifs_stats_proc_show(struct seq_file *m, void *v)
700 {
701 	int i;
702 #ifdef CONFIG_CIFS_STATS2
703 	int j;
704 #endif /* STATS2 */
705 	struct TCP_Server_Info *server;
706 	struct cifs_ses *ses;
707 	struct cifs_tcon *tcon;
708 
709 	seq_printf(m, "Resources in use\nCIFS Session: %d\n",
710 			sesInfoAllocCount.counter);
711 	seq_printf(m, "Share (unique mount targets): %d\n",
712 			tconInfoAllocCount.counter);
713 	seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
714 			buf_alloc_count.counter,
715 			cifs_min_rcv + tcpSesAllocCount.counter);
716 	seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
717 			small_buf_alloc_count.counter, cifs_min_small);
718 #ifdef CONFIG_CIFS_STATS2
719 	seq_printf(m, "Total Large %d Small %d Allocations\n",
720 				atomic_read(&total_buf_alloc_count),
721 				atomic_read(&total_small_buf_alloc_count));
722 #endif /* CONFIG_CIFS_STATS2 */
723 
724 	seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&mid_count));
725 	seq_printf(m,
726 		"\n%d session %d share reconnects\n",
727 		tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
728 
729 	seq_printf(m,
730 		"Total vfs operations: %d maximum at one time: %d\n",
731 		GlobalCurrentXid, GlobalMaxActiveXid);
732 
733 	i = 0;
734 	spin_lock(&cifs_tcp_ses_lock);
735 	list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
736 		seq_printf(m, "\nMax requests in flight: %d", server->max_in_flight);
737 #ifdef CONFIG_CIFS_STATS2
738 		seq_puts(m, "\nTotal time spent processing by command. Time ");
739 		seq_printf(m, "units are jiffies (%d per second)\n", HZ);
740 		seq_puts(m, "  SMB3 CMD\tNumber\tTotal Time\tFastest\tSlowest\n");
741 		seq_puts(m, "  --------\t------\t----------\t-------\t-------\n");
742 		for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
743 			seq_printf(m, "  %d\t\t%d\t%llu\t\t%u\t%u\n", j,
744 				atomic_read(&server->num_cmds[j]),
745 				server->time_per_cmd[j],
746 				server->fastest_cmd[j],
747 				server->slowest_cmd[j]);
748 		for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
749 			if (atomic_read(&server->smb2slowcmd[j])) {
750 				spin_lock(&server->srv_lock);
751 				seq_printf(m, "  %d slow responses from %s for command %d\n",
752 					atomic_read(&server->smb2slowcmd[j]),
753 					server->hostname, j);
754 				spin_unlock(&server->srv_lock);
755 			}
756 #endif /* STATS2 */
757 		list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
758 			list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
759 				i++;
760 				seq_printf(m, "\n%d) %s", i, tcon->tree_name);
761 				if (tcon->need_reconnect)
762 					seq_puts(m, "\tDISCONNECTED ");
763 				seq_printf(m, "\nSMBs: %d since %ptTs UTC",
764 					   atomic_read(&tcon->num_smbs_sent),
765 					   &tcon->stats_from_time);
766 				if (server->ops->print_stats)
767 					server->ops->print_stats(m, tcon);
768 			}
769 		}
770 	}
771 	spin_unlock(&cifs_tcp_ses_lock);
772 
773 	seq_putc(m, '\n');
774 	return 0;
775 }
776 
777 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
778 {
779 	return single_open(file, cifs_stats_proc_show, NULL);
780 }
781 
782 static const struct proc_ops cifs_stats_proc_ops = {
783 	.proc_open	= cifs_stats_proc_open,
784 	.proc_read	= seq_read,
785 	.proc_lseek	= seq_lseek,
786 	.proc_release	= single_release,
787 	.proc_write	= cifs_stats_proc_write,
788 };
789 
790 #ifdef CONFIG_CIFS_SMB_DIRECT
791 #define PROC_FILE_DEFINE(name) \
792 static ssize_t name##_write(struct file *file, const char __user *buffer, \
793 	size_t count, loff_t *ppos) \
794 { \
795 	int rc; \
796 	rc = kstrtoint_from_user(buffer, count, 10, &name); \
797 	if (rc) \
798 		return rc; \
799 	return count; \
800 } \
801 static int name##_proc_show(struct seq_file *m, void *v) \
802 { \
803 	seq_printf(m, "%d\n", name); \
804 	return 0; \
805 } \
806 static int name##_open(struct inode *inode, struct file *file) \
807 { \
808 	return single_open(file, name##_proc_show, NULL); \
809 } \
810 \
811 static const struct proc_ops cifs_##name##_proc_fops = { \
812 	.proc_open	= name##_open, \
813 	.proc_read	= seq_read, \
814 	.proc_lseek	= seq_lseek, \
815 	.proc_release	= single_release, \
816 	.proc_write	= name##_write, \
817 }
818 
819 PROC_FILE_DEFINE(rdma_readwrite_threshold);
820 PROC_FILE_DEFINE(smbd_max_frmr_depth);
821 PROC_FILE_DEFINE(smbd_keep_alive_interval);
822 PROC_FILE_DEFINE(smbd_max_receive_size);
823 PROC_FILE_DEFINE(smbd_max_fragmented_recv_size);
824 PROC_FILE_DEFINE(smbd_max_send_size);
825 PROC_FILE_DEFINE(smbd_send_credit_target);
826 PROC_FILE_DEFINE(smbd_receive_credit_max);
827 #endif
828 
829 static struct proc_dir_entry *proc_fs_cifs;
830 static const struct proc_ops cifsFYI_proc_ops;
831 static const struct proc_ops cifs_lookup_cache_proc_ops;
832 static const struct proc_ops traceSMB_proc_ops;
833 static const struct proc_ops cifs_security_flags_proc_ops;
834 static const struct proc_ops cifs_linux_ext_proc_ops;
835 static const struct proc_ops cifs_mount_params_proc_ops;
836 
837 void
838 cifs_proc_init(void)
839 {
840 	proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
841 	if (proc_fs_cifs == NULL)
842 		return;
843 
844 	proc_create_single("DebugData", 0, proc_fs_cifs,
845 			cifs_debug_data_proc_show);
846 
847 	proc_create_single("open_files", 0400, proc_fs_cifs,
848 			cifs_debug_files_proc_show);
849 
850 	proc_create("Stats", 0644, proc_fs_cifs, &cifs_stats_proc_ops);
851 	proc_create("cifsFYI", 0644, proc_fs_cifs, &cifsFYI_proc_ops);
852 	proc_create("traceSMB", 0644, proc_fs_cifs, &traceSMB_proc_ops);
853 	proc_create("LinuxExtensionsEnabled", 0644, proc_fs_cifs,
854 		    &cifs_linux_ext_proc_ops);
855 	proc_create("SecurityFlags", 0644, proc_fs_cifs,
856 		    &cifs_security_flags_proc_ops);
857 	proc_create("LookupCacheEnabled", 0644, proc_fs_cifs,
858 		    &cifs_lookup_cache_proc_ops);
859 
860 	proc_create("mount_params", 0444, proc_fs_cifs, &cifs_mount_params_proc_ops);
861 
862 #ifdef CONFIG_CIFS_DFS_UPCALL
863 	proc_create("dfscache", 0644, proc_fs_cifs, &dfscache_proc_ops);
864 #endif
865 
866 #ifdef CONFIG_CIFS_SMB_DIRECT
867 	proc_create("rdma_readwrite_threshold", 0644, proc_fs_cifs,
868 		&cifs_rdma_readwrite_threshold_proc_fops);
869 	proc_create("smbd_max_frmr_depth", 0644, proc_fs_cifs,
870 		&cifs_smbd_max_frmr_depth_proc_fops);
871 	proc_create("smbd_keep_alive_interval", 0644, proc_fs_cifs,
872 		&cifs_smbd_keep_alive_interval_proc_fops);
873 	proc_create("smbd_max_receive_size", 0644, proc_fs_cifs,
874 		&cifs_smbd_max_receive_size_proc_fops);
875 	proc_create("smbd_max_fragmented_recv_size", 0644, proc_fs_cifs,
876 		&cifs_smbd_max_fragmented_recv_size_proc_fops);
877 	proc_create("smbd_max_send_size", 0644, proc_fs_cifs,
878 		&cifs_smbd_max_send_size_proc_fops);
879 	proc_create("smbd_send_credit_target", 0644, proc_fs_cifs,
880 		&cifs_smbd_send_credit_target_proc_fops);
881 	proc_create("smbd_receive_credit_max", 0644, proc_fs_cifs,
882 		&cifs_smbd_receive_credit_max_proc_fops);
883 #endif
884 }
885 
886 void
887 cifs_proc_clean(void)
888 {
889 	if (proc_fs_cifs == NULL)
890 		return;
891 
892 	remove_proc_entry("DebugData", proc_fs_cifs);
893 	remove_proc_entry("open_files", proc_fs_cifs);
894 	remove_proc_entry("cifsFYI", proc_fs_cifs);
895 	remove_proc_entry("traceSMB", proc_fs_cifs);
896 	remove_proc_entry("Stats", proc_fs_cifs);
897 	remove_proc_entry("SecurityFlags", proc_fs_cifs);
898 	remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
899 	remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
900 	remove_proc_entry("mount_params", proc_fs_cifs);
901 
902 #ifdef CONFIG_CIFS_DFS_UPCALL
903 	remove_proc_entry("dfscache", proc_fs_cifs);
904 #endif
905 #ifdef CONFIG_CIFS_SMB_DIRECT
906 	remove_proc_entry("rdma_readwrite_threshold", proc_fs_cifs);
907 	remove_proc_entry("smbd_max_frmr_depth", proc_fs_cifs);
908 	remove_proc_entry("smbd_keep_alive_interval", proc_fs_cifs);
909 	remove_proc_entry("smbd_max_receive_size", proc_fs_cifs);
910 	remove_proc_entry("smbd_max_fragmented_recv_size", proc_fs_cifs);
911 	remove_proc_entry("smbd_max_send_size", proc_fs_cifs);
912 	remove_proc_entry("smbd_send_credit_target", proc_fs_cifs);
913 	remove_proc_entry("smbd_receive_credit_max", proc_fs_cifs);
914 #endif
915 	remove_proc_entry("fs/cifs", NULL);
916 }
917 
918 static int cifsFYI_proc_show(struct seq_file *m, void *v)
919 {
920 	seq_printf(m, "%d\n", cifsFYI);
921 	return 0;
922 }
923 
924 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
925 {
926 	return single_open(file, cifsFYI_proc_show, NULL);
927 }
928 
929 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
930 		size_t count, loff_t *ppos)
931 {
932 	char c[2] = { '\0' };
933 	bool bv;
934 	int rc;
935 
936 	rc = get_user(c[0], buffer);
937 	if (rc)
938 		return rc;
939 	if (kstrtobool(c, &bv) == 0)
940 		cifsFYI = bv;
941 	else if ((c[0] > '1') && (c[0] <= '9'))
942 		cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
943 	else
944 		return -EINVAL;
945 
946 	return count;
947 }
948 
949 static const struct proc_ops cifsFYI_proc_ops = {
950 	.proc_open	= cifsFYI_proc_open,
951 	.proc_read	= seq_read,
952 	.proc_lseek	= seq_lseek,
953 	.proc_release	= single_release,
954 	.proc_write	= cifsFYI_proc_write,
955 };
956 
957 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
958 {
959 	seq_printf(m, "%d\n", linuxExtEnabled);
960 	return 0;
961 }
962 
963 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
964 {
965 	return single_open(file, cifs_linux_ext_proc_show, NULL);
966 }
967 
968 static ssize_t cifs_linux_ext_proc_write(struct file *file,
969 		const char __user *buffer, size_t count, loff_t *ppos)
970 {
971 	int rc;
972 
973 	rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
974 	if (rc)
975 		return rc;
976 
977 	return count;
978 }
979 
980 static const struct proc_ops cifs_linux_ext_proc_ops = {
981 	.proc_open	= cifs_linux_ext_proc_open,
982 	.proc_read	= seq_read,
983 	.proc_lseek	= seq_lseek,
984 	.proc_release	= single_release,
985 	.proc_write	= cifs_linux_ext_proc_write,
986 };
987 
988 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
989 {
990 	seq_printf(m, "%d\n", lookupCacheEnabled);
991 	return 0;
992 }
993 
994 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
995 {
996 	return single_open(file, cifs_lookup_cache_proc_show, NULL);
997 }
998 
999 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
1000 		const char __user *buffer, size_t count, loff_t *ppos)
1001 {
1002 	int rc;
1003 
1004 	rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
1005 	if (rc)
1006 		return rc;
1007 
1008 	return count;
1009 }
1010 
1011 static const struct proc_ops cifs_lookup_cache_proc_ops = {
1012 	.proc_open	= cifs_lookup_cache_proc_open,
1013 	.proc_read	= seq_read,
1014 	.proc_lseek	= seq_lseek,
1015 	.proc_release	= single_release,
1016 	.proc_write	= cifs_lookup_cache_proc_write,
1017 };
1018 
1019 static int traceSMB_proc_show(struct seq_file *m, void *v)
1020 {
1021 	seq_printf(m, "%d\n", traceSMB);
1022 	return 0;
1023 }
1024 
1025 static int traceSMB_proc_open(struct inode *inode, struct file *file)
1026 {
1027 	return single_open(file, traceSMB_proc_show, NULL);
1028 }
1029 
1030 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
1031 		size_t count, loff_t *ppos)
1032 {
1033 	int rc;
1034 
1035 	rc = kstrtobool_from_user(buffer, count, &traceSMB);
1036 	if (rc)
1037 		return rc;
1038 
1039 	return count;
1040 }
1041 
1042 static const struct proc_ops traceSMB_proc_ops = {
1043 	.proc_open	= traceSMB_proc_open,
1044 	.proc_read	= seq_read,
1045 	.proc_lseek	= seq_lseek,
1046 	.proc_release	= single_release,
1047 	.proc_write	= traceSMB_proc_write,
1048 };
1049 
1050 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
1051 {
1052 	seq_printf(m, "0x%x\n", global_secflags);
1053 	return 0;
1054 }
1055 
1056 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
1057 {
1058 	return single_open(file, cifs_security_flags_proc_show, NULL);
1059 }
1060 
1061 /*
1062  * Ensure that if someone sets a MUST flag, that we disable all other MAY
1063  * flags except for the ones corresponding to the given MUST flag. If there are
1064  * multiple MUST flags, then try to prefer more secure ones.
1065  */
1066 static void
1067 cifs_security_flags_handle_must_flags(unsigned int *flags)
1068 {
1069 	unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
1070 
1071 	if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
1072 		*flags = CIFSSEC_MUST_KRB5;
1073 	else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
1074 		*flags = CIFSSEC_MUST_NTLMSSP;
1075 	else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
1076 		*flags = CIFSSEC_MUST_NTLMV2;
1077 
1078 	*flags |= signflags;
1079 }
1080 
1081 static ssize_t cifs_security_flags_proc_write(struct file *file,
1082 		const char __user *buffer, size_t count, loff_t *ppos)
1083 {
1084 	int rc;
1085 	unsigned int flags;
1086 	char flags_string[12];
1087 	bool bv;
1088 
1089 	if ((count < 1) || (count > 11))
1090 		return -EINVAL;
1091 
1092 	memset(flags_string, 0, 12);
1093 
1094 	if (copy_from_user(flags_string, buffer, count))
1095 		return -EFAULT;
1096 
1097 	if (count < 3) {
1098 		/* single char or single char followed by null */
1099 		if (kstrtobool(flags_string, &bv) == 0) {
1100 			global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
1101 			return count;
1102 		} else if (!isdigit(flags_string[0])) {
1103 			cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
1104 					flags_string);
1105 			return -EINVAL;
1106 		}
1107 	}
1108 
1109 	/* else we have a number */
1110 	rc = kstrtouint(flags_string, 0, &flags);
1111 	if (rc) {
1112 		cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
1113 				flags_string);
1114 		return rc;
1115 	}
1116 
1117 	cifs_dbg(FYI, "sec flags 0x%x\n", flags);
1118 
1119 	if (flags == 0)  {
1120 		cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
1121 		return -EINVAL;
1122 	}
1123 
1124 	if (flags & ~CIFSSEC_MASK) {
1125 		cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
1126 			 flags & ~CIFSSEC_MASK);
1127 		return -EINVAL;
1128 	}
1129 
1130 	cifs_security_flags_handle_must_flags(&flags);
1131 
1132 	/* flags look ok - update the global security flags for cifs module */
1133 	global_secflags = flags;
1134 	if (global_secflags & CIFSSEC_MUST_SIGN) {
1135 		/* requiring signing implies signing is allowed */
1136 		global_secflags |= CIFSSEC_MAY_SIGN;
1137 		cifs_dbg(FYI, "packet signing now required\n");
1138 	} else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
1139 		cifs_dbg(FYI, "packet signing disabled\n");
1140 	}
1141 	/* BB should we turn on MAY flags for other MUST options? */
1142 	return count;
1143 }
1144 
1145 static const struct proc_ops cifs_security_flags_proc_ops = {
1146 	.proc_open	= cifs_security_flags_proc_open,
1147 	.proc_read	= seq_read,
1148 	.proc_lseek	= seq_lseek,
1149 	.proc_release	= single_release,
1150 	.proc_write	= cifs_security_flags_proc_write,
1151 };
1152 
1153 /* To make it easier to debug, can help to show mount params */
1154 static int cifs_mount_params_proc_show(struct seq_file *m, void *v)
1155 {
1156 	const struct fs_parameter_spec *p;
1157 	const char *type;
1158 
1159 	for (p = smb3_fs_parameters; p->name; p++) {
1160 		/* cannot use switch with pointers... */
1161 		if (!p->type) {
1162 			if (p->flags == fs_param_neg_with_no)
1163 				type = "noflag";
1164 			else
1165 				type = "flag";
1166 		} else if (p->type == fs_param_is_bool)
1167 			type = "bool";
1168 		else if (p->type == fs_param_is_u32)
1169 			type = "u32";
1170 		else if (p->type == fs_param_is_u64)
1171 			type = "u64";
1172 		else if (p->type == fs_param_is_string)
1173 			type = "string";
1174 		else
1175 			type = "unknown";
1176 
1177 		seq_printf(m, "%s:%s\n", p->name, type);
1178 	}
1179 
1180 	return 0;
1181 }
1182 
1183 static int cifs_mount_params_proc_open(struct inode *inode, struct file *file)
1184 {
1185 	return single_open(file, cifs_mount_params_proc_show, NULL);
1186 }
1187 
1188 static const struct proc_ops cifs_mount_params_proc_ops = {
1189 	.proc_open	= cifs_mount_params_proc_open,
1190 	.proc_read	= seq_read,
1191 	.proc_lseek	= seq_lseek,
1192 	.proc_release	= single_release,
1193 	/* No need for write for now */
1194 	/* .proc_write	= cifs_mount_params_proc_write, */
1195 };
1196 
1197 #else
1198 inline void cifs_proc_init(void)
1199 {
1200 }
1201 
1202 inline void cifs_proc_clean(void)
1203 {
1204 }
1205 #endif /* PROC_FS */
1206