1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* Maintain an RxRPC server socket to do AFS communications through
3 *
4 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #include <linux/slab.h>
9 #include <linux/sched/signal.h>
10
11 #include <net/sock.h>
12 #include <net/af_rxrpc.h>
13 #include "internal.h"
14 #include "afs_cm.h"
15 #include "protocol_yfs.h"
16 #define RXRPC_TRACE_ONLY_DEFINE_ENUMS
17 #include <trace/events/rxrpc.h>
18
19 struct workqueue_struct *afs_async_calls;
20
21 static void afs_deferred_free_worker(struct work_struct *work);
22 static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
23 static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
24 static void afs_process_async_call(struct work_struct *);
25 static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
26 static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
27 static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID);
28 static void afs_rx_notify_oob(struct sock *sk, struct sk_buff *oob);
29 static int afs_deliver_cm_op_id(struct afs_call *);
30
31 static const struct rxrpc_kernel_ops afs_rxrpc_callback_ops = {
32 .notify_new_call = afs_rx_new_call,
33 .discard_new_call = afs_rx_discard_new_call,
34 .user_attach_call = afs_rx_attach,
35 .notify_oob = afs_rx_notify_oob,
36 };
37
38 /* asynchronous incoming call initial processing */
39 static const struct afs_call_type afs_RXCMxxxx = {
40 .name = "CB.xxxx",
41 .deliver = afs_deliver_cm_op_id,
42 };
43
44 /*
45 * open an RxRPC socket and bind it to be a server for callback notifications
46 * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
47 */
afs_open_socket(struct afs_net * net)48 int afs_open_socket(struct afs_net *net)
49 {
50 struct sockaddr_rxrpc srx;
51 struct socket *socket;
52 int ret;
53
54 _enter("");
55
56 ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket);
57 if (ret < 0)
58 goto error_1;
59
60 socket->sk->sk_allocation = GFP_NOFS;
61 socket->sk->sk_user_data = net;
62
63 /* bind the callback manager's address to make this a server socket */
64 memset(&srx, 0, sizeof(srx));
65 srx.srx_family = AF_RXRPC;
66 srx.srx_service = CM_SERVICE;
67 srx.transport_type = SOCK_DGRAM;
68 srx.transport_len = sizeof(srx.transport.sin6);
69 srx.transport.sin6.sin6_family = AF_INET6;
70 srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);
71
72 ret = rxrpc_sock_set_min_security_level(socket->sk,
73 RXRPC_SECURITY_ENCRYPT);
74 if (ret < 0)
75 goto error_2;
76
77 ret = rxrpc_sock_set_manage_response(socket->sk, true);
78 if (ret < 0)
79 goto error_2;
80
81 ret = afs_create_token_key(net, socket);
82 if (ret < 0)
83 pr_err("Couldn't create RxGK CM key: %d\n", ret);
84
85 ret = kernel_bind(socket, (struct sockaddr_unsized *) &srx, sizeof(srx));
86 if (ret == -EADDRINUSE) {
87 srx.transport.sin6.sin6_port = 0;
88 ret = kernel_bind(socket, (struct sockaddr_unsized *) &srx, sizeof(srx));
89 }
90 if (ret < 0)
91 goto error_2;
92
93 srx.srx_service = YFS_CM_SERVICE;
94 ret = kernel_bind(socket, (struct sockaddr_unsized *) &srx, sizeof(srx));
95 if (ret < 0)
96 goto error_2;
97
98 /* Ideally, we'd turn on service upgrade here, but we can't because
99 * OpenAFS is buggy and leaks the userStatus field from packet to
100 * packet and between FS packets and CB packets - so if we try to do an
101 * upgrade on an FS packet, OpenAFS will leak that into the CB packet
102 * it sends back to us.
103 */
104
105 rxrpc_kernel_set_notifications(socket, &afs_rxrpc_callback_ops);
106
107 ret = kernel_listen(socket, INT_MAX);
108 if (ret < 0)
109 goto error_2;
110
111 net->socket = socket;
112 afs_charge_preallocation(&net->charge_preallocation_work);
113 _leave(" = 0");
114 return 0;
115
116 error_2:
117 sock_release(socket);
118 error_1:
119 _leave(" = %d", ret);
120 return ret;
121 }
122
123 /*
124 * close the RxRPC socket AFS was using
125 */
afs_close_socket(struct afs_net * net)126 void afs_close_socket(struct afs_net *net)
127 {
128 _enter("");
129
130 cancel_work_sync(&net->charge_preallocation_work);
131 cancel_work_sync(&net->rx_oob_work);
132 /* Future work items should now see ->live is false. */
133
134 kernel_listen(net->socket, 0);
135
136 /* Make sure work items are no longer running. */
137 flush_workqueue(afs_async_calls);
138 cancel_work_sync(&net->charge_preallocation_work);
139
140 if (net->spare_incoming_call) {
141 afs_put_call(net->spare_incoming_call);
142 net->spare_incoming_call = NULL;
143 }
144
145 _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls));
146 wait_var_event(&net->nr_outstanding_calls,
147 !atomic_read(&net->nr_outstanding_calls));
148 _debug("no outstanding calls");
149
150 kernel_sock_shutdown(net->socket, SHUT_RDWR);
151 flush_workqueue(afs_async_calls);
152 cancel_work_sync(&net->rx_oob_work);
153 net->socket->sk->sk_user_data = NULL;
154 sock_release(net->socket);
155 key_put(net->fs_cm_token_key);
156
157 _debug("dework");
158 _leave("");
159 }
160
161 /*
162 * Allocate a call.
163 */
afs_alloc_call(struct afs_net * net,const struct afs_call_type * type,gfp_t gfp)164 static struct afs_call *afs_alloc_call(struct afs_net *net,
165 const struct afs_call_type *type,
166 gfp_t gfp)
167 {
168 struct afs_call *call;
169 int o;
170
171 call = kzalloc_obj(*call, gfp);
172 if (!call)
173 return NULL;
174
175 call->type = type;
176 call->net = net;
177 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
178 refcount_set(&call->ref, 1);
179 INIT_WORK(&call->async_work, type->async_rx ?: afs_process_async_call);
180 INIT_WORK(&call->work, call->type->work);
181 INIT_WORK(&call->free_work, afs_deferred_free_worker);
182 init_waitqueue_head(&call->waitq);
183 spin_lock_init(&call->state_lock);
184 call->iter = &call->def_iter;
185
186 o = atomic_inc_return(&net->nr_outstanding_calls);
187 trace_afs_call(call->debug_id, afs_call_trace_alloc, 1, o,
188 __builtin_return_address(0));
189 return call;
190 }
191
afs_free_call(struct afs_call * call)192 static void afs_free_call(struct afs_call *call)
193 {
194 struct afs_net *net = call->net;
195 int o;
196
197 ASSERT(!work_pending(&call->async_work));
198
199 rxrpc_kernel_put_peer(call->peer);
200
201 if (call->rxcall) {
202 rxrpc_kernel_shutdown_call(net->socket, call->rxcall);
203 rxrpc_kernel_put_call(net->socket, call->rxcall);
204 call->rxcall = NULL;
205 }
206 if (call->type->destructor)
207 call->type->destructor(call);
208
209 afs_unuse_server_notime(call->net, call->server, afs_server_trace_unuse_call);
210 kfree(call->request);
211
212 o = atomic_read(&net->nr_outstanding_calls);
213 trace_afs_call(call->debug_id, afs_call_trace_free, 0, o,
214 __builtin_return_address(0));
215 kfree(call);
216
217 o = atomic_dec_return(&net->nr_outstanding_calls);
218 if (o == 0)
219 wake_up_var(&net->nr_outstanding_calls);
220 }
221
222 /*
223 * Dispose of a reference on a call.
224 */
afs_put_call(struct afs_call * call)225 void afs_put_call(struct afs_call *call)
226 {
227 struct afs_net *net = call->net;
228 unsigned int debug_id = call->debug_id;
229 bool zero;
230 int r, o;
231
232 zero = __refcount_dec_and_test(&call->ref, &r);
233 o = atomic_read(&net->nr_outstanding_calls);
234 trace_afs_call(debug_id, afs_call_trace_put, r - 1, o,
235 __builtin_return_address(0));
236 if (zero)
237 afs_free_call(call);
238 }
239
afs_deferred_free_worker(struct work_struct * work)240 static void afs_deferred_free_worker(struct work_struct *work)
241 {
242 struct afs_call *call = container_of(work, struct afs_call, free_work);
243
244 afs_free_call(call);
245 }
246
247 /*
248 * Dispose of a reference on a call, deferring the cleanup to a workqueue
249 * to avoid lock recursion.
250 */
afs_deferred_put_call(struct afs_call * call)251 void afs_deferred_put_call(struct afs_call *call)
252 {
253 struct afs_net *net = call->net;
254 unsigned int debug_id = call->debug_id;
255 bool zero;
256 int r, o;
257
258 zero = __refcount_dec_and_test(&call->ref, &r);
259 o = atomic_read(&net->nr_outstanding_calls);
260 trace_afs_call(debug_id, afs_call_trace_put, r - 1, o,
261 __builtin_return_address(0));
262 if (zero)
263 schedule_work(&call->free_work);
264 }
265
266 /*
267 * Queue the call for actual work.
268 */
afs_queue_call_work(struct afs_call * call)269 static void afs_queue_call_work(struct afs_call *call)
270 {
271 if (call->type->work) {
272 afs_get_call(call, afs_call_trace_work);
273 if (!queue_work(afs_wq, &call->work))
274 afs_put_call(call);
275 }
276 }
277
278 /*
279 * allocate a call with flat request and reply buffers
280 */
afs_alloc_flat_call(struct afs_net * net,const struct afs_call_type * type,size_t request_size,size_t reply_max)281 struct afs_call *afs_alloc_flat_call(struct afs_net *net,
282 const struct afs_call_type *type,
283 size_t request_size, size_t reply_max)
284 {
285 struct afs_call *call;
286
287 call = afs_alloc_call(net, type, GFP_NOFS);
288 if (!call)
289 goto nomem_call;
290
291 if (request_size) {
292 call->request_size = request_size;
293 call->request = kmalloc(request_size, GFP_NOFS);
294 if (!call->request)
295 goto nomem_free;
296 }
297
298 if (reply_max) {
299 call->reply_max = reply_max;
300 call->buffer = kmalloc(reply_max, GFP_NOFS);
301 if (!call->buffer)
302 goto nomem_free;
303 }
304
305 afs_extract_to_buf(call, call->reply_max);
306 call->operation_ID = type->op;
307 init_waitqueue_head(&call->waitq);
308 return call;
309
310 nomem_free:
311 afs_put_call(call);
312 nomem_call:
313 return NULL;
314 }
315
316 /*
317 * clean up a call with flat buffer
318 */
afs_flat_call_destructor(struct afs_call * call)319 void afs_flat_call_destructor(struct afs_call *call)
320 {
321 _enter("");
322
323 kfree(call->request);
324 call->request = NULL;
325 kfree(call->buffer);
326 call->buffer = NULL;
327 }
328
329 /*
330 * Advance the AFS call state when the RxRPC call ends the transmit phase.
331 */
afs_notify_end_request_tx(struct sock * sock,struct rxrpc_call * rxcall,unsigned long call_user_ID)332 static void afs_notify_end_request_tx(struct sock *sock,
333 struct rxrpc_call *rxcall,
334 unsigned long call_user_ID)
335 {
336 struct afs_call *call = (struct afs_call *)call_user_ID;
337
338 afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY);
339 }
340
341 /*
342 * Initiate a call and synchronously queue up the parameters for dispatch. Any
343 * error is stored into the call struct, which the caller must check for.
344 */
afs_make_call(struct afs_call * call,gfp_t gfp)345 void afs_make_call(struct afs_call *call, gfp_t gfp)
346 {
347 struct rxrpc_call *rxcall;
348 struct msghdr msg;
349 struct kvec iov[1];
350 size_t len;
351 s64 tx_total_len;
352 int ret;
353
354 _enter(",{%pISp+%u},", rxrpc_kernel_remote_addr(call->peer), call->service_id);
355
356 ASSERT(call->type != NULL);
357 ASSERT(call->type->name != NULL);
358
359 _debug("____MAKE %p{%s,%x} [%d]____",
360 call, call->type->name, key_serial(call->key),
361 atomic_read(&call->net->nr_outstanding_calls));
362
363 trace_afs_make_call(call);
364
365 /* Work out the length we're going to transmit. This is awkward for
366 * calls such as FS.StoreData where there's an extra injection of data
367 * after the initial fixed part.
368 */
369 tx_total_len = call->request_size;
370 if (call->write_iter)
371 tx_total_len += iov_iter_count(call->write_iter);
372
373 /* If the call is going to be asynchronous, we need an extra ref for
374 * the call to hold itself so the caller need not hang on to its ref.
375 */
376 if (call->async) {
377 afs_get_call(call, afs_call_trace_get);
378 call->drop_ref = true;
379 }
380
381 /* create a call */
382 rxcall = rxrpc_kernel_begin_call(call->net->socket, call->peer, call->key,
383 (unsigned long)call,
384 tx_total_len,
385 call->max_lifespan,
386 gfp,
387 (call->async ?
388 afs_wake_up_async_call :
389 afs_wake_up_call_waiter),
390 call->service_id,
391 call->upgrade,
392 (call->intr ? RXRPC_PREINTERRUPTIBLE :
393 RXRPC_UNINTERRUPTIBLE),
394 call->debug_id);
395 if (IS_ERR(rxcall)) {
396 ret = PTR_ERR(rxcall);
397 call->error = ret;
398 goto error_kill_call;
399 }
400
401 call->rxcall = rxcall;
402 call->issue_time = ktime_get_real();
403
404 /* send the request */
405 iov[0].iov_base = call->request;
406 iov[0].iov_len = call->request_size;
407
408 msg.msg_name = NULL;
409 msg.msg_namelen = 0;
410 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, call->request_size);
411 msg.msg_control = NULL;
412 msg.msg_controllen = 0;
413 msg.msg_flags = MSG_WAITALL | (call->write_iter ? MSG_MORE : 0);
414
415 ret = rxrpc_kernel_send_data(call->net->socket, rxcall,
416 &msg, call->request_size,
417 afs_notify_end_request_tx);
418 if (ret < 0)
419 goto error_do_abort;
420
421 if (call->write_iter) {
422 msg.msg_iter = *call->write_iter;
423 msg.msg_flags &= ~MSG_MORE;
424 trace_afs_send_data(call, &msg);
425
426 ret = rxrpc_kernel_send_data(call->net->socket,
427 call->rxcall, &msg,
428 iov_iter_count(&msg.msg_iter),
429 afs_notify_end_request_tx);
430 *call->write_iter = msg.msg_iter;
431
432 trace_afs_sent_data(call, &msg, ret);
433 if (ret < 0)
434 goto error_do_abort;
435 }
436
437 /* Note that at this point, we may have received the reply or an abort
438 * - and an asynchronous call may already have completed.
439 *
440 * afs_wait_for_call_to_complete(call)
441 * must be called to synchronously clean up.
442 */
443 return;
444
445 error_do_abort:
446 if (ret != -ECONNABORTED)
447 rxrpc_kernel_abort_call(call->net->socket, rxcall,
448 RX_USER_ABORT, ret,
449 afs_abort_send_data_error);
450 if (call->async) {
451 afs_see_call(call, afs_call_trace_async_abort);
452 return;
453 }
454
455 if (ret == -ECONNABORTED) {
456 len = 0;
457 iov_iter_kvec(&msg.msg_iter, ITER_DEST, NULL, 0, 0);
458 rxrpc_kernel_recv_data(call->net->socket, rxcall,
459 &msg.msg_iter, &len, false,
460 &call->abort_code, &call->service_id);
461 call->responded = true;
462 }
463 call->error = ret;
464 trace_afs_call_done(call);
465 error_kill_call:
466 if (call->async)
467 afs_see_call(call, afs_call_trace_async_kill);
468 if (call->type->immediate_cancel)
469 call->type->immediate_cancel(call);
470
471 /* We need to dispose of the extra ref we grabbed for an async call.
472 * The call, however, might be queued on afs_async_calls and we need to
473 * make sure we don't get any more notifications that might requeue it.
474 */
475 if (call->rxcall)
476 rxrpc_kernel_shutdown_call(call->net->socket, call->rxcall);
477 if (call->async) {
478 if (cancel_work_sync(&call->async_work))
479 afs_put_call(call);
480 afs_set_call_complete(call, ret, 0);
481 }
482
483 call->error = ret;
484 call->state = AFS_CALL_COMPLETE;
485 _leave(" = %d", ret);
486 }
487
488 /*
489 * Log remote abort codes that indicate that we have a protocol disagreement
490 * with the server.
491 */
afs_log_error(struct afs_call * call,s32 remote_abort)492 static void afs_log_error(struct afs_call *call, s32 remote_abort)
493 {
494 static int max = 0;
495 const char *msg;
496 int m;
497
498 switch (remote_abort) {
499 case RX_EOF: msg = "unexpected EOF"; break;
500 case RXGEN_CC_MARSHAL: msg = "client marshalling"; break;
501 case RXGEN_CC_UNMARSHAL: msg = "client unmarshalling"; break;
502 case RXGEN_SS_MARSHAL: msg = "server marshalling"; break;
503 case RXGEN_SS_UNMARSHAL: msg = "server unmarshalling"; break;
504 case RXGEN_DECODE: msg = "opcode decode"; break;
505 case RXGEN_SS_XDRFREE: msg = "server XDR cleanup"; break;
506 case RXGEN_CC_XDRFREE: msg = "client XDR cleanup"; break;
507 case -32: msg = "insufficient data"; break;
508 default:
509 return;
510 }
511
512 m = max;
513 if (m < 3) {
514 max = m + 1;
515 pr_notice("kAFS: Peer reported %s failure on %s [%pISp]\n",
516 msg, call->type->name,
517 rxrpc_kernel_remote_addr(call->peer));
518 }
519 }
520
521 /*
522 * deliver messages to a call
523 */
afs_deliver_to_call(struct afs_call * call)524 void afs_deliver_to_call(struct afs_call *call)
525 {
526 enum afs_call_state state;
527 size_t len;
528 u32 abort_code, remote_abort = 0;
529 int ret;
530
531 _enter("%s", call->type->name);
532
533 while (state = READ_ONCE(call->state),
534 state == AFS_CALL_CL_AWAIT_REPLY ||
535 state == AFS_CALL_SV_AWAIT_OP_ID ||
536 state == AFS_CALL_SV_AWAIT_REQUEST ||
537 state == AFS_CALL_SV_AWAIT_ACK
538 ) {
539 if (state == AFS_CALL_SV_AWAIT_ACK) {
540 len = 0;
541 iov_iter_kvec(&call->def_iter, ITER_DEST, NULL, 0, 0);
542 ret = rxrpc_kernel_recv_data(call->net->socket,
543 call->rxcall, &call->def_iter,
544 &len, false, &remote_abort,
545 &call->service_id);
546 trace_afs_receive_data(call, &call->def_iter, false, ret);
547
548 if (ret == -EINPROGRESS || ret == -EAGAIN)
549 return;
550 if (ret < 0 || ret == 1) {
551 if (ret == 1)
552 ret = 0;
553 goto call_complete;
554 }
555 return;
556 }
557
558 ret = call->type->deliver(call);
559 state = READ_ONCE(call->state);
560 if (ret == 0 && call->unmarshalling_error)
561 ret = -EBADMSG;
562 switch (ret) {
563 case 0:
564 call->responded = true;
565 afs_queue_call_work(call);
566 if (state == AFS_CALL_CL_PROC_REPLY) {
567 if (call->op)
568 set_bit(AFS_SERVER_FL_MAY_HAVE_CB,
569 &call->op->server->flags);
570 goto call_complete;
571 }
572 ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY);
573 goto done;
574 case -EINPROGRESS:
575 case -EAGAIN:
576 goto out;
577 case -ECONNABORTED:
578 ASSERTCMP(state, ==, AFS_CALL_COMPLETE);
579 call->responded = true;
580 afs_log_error(call, call->abort_code);
581 goto done;
582 case -ENOTSUPP:
583 call->responded = true;
584 abort_code = RXGEN_OPCODE;
585 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
586 abort_code, ret,
587 afs_abort_op_not_supported);
588 goto local_abort;
589 case -EIO:
590 pr_err("kAFS: Call %u in bad state %u\n",
591 call->debug_id, state);
592 fallthrough;
593 case -ENODATA:
594 case -EBADMSG:
595 case -EMSGSIZE:
596 case -ENOMEM:
597 case -EFAULT:
598 abort_code = RXGEN_CC_UNMARSHAL;
599 if (state != AFS_CALL_CL_AWAIT_REPLY)
600 abort_code = RXGEN_SS_UNMARSHAL;
601 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
602 abort_code, ret,
603 afs_abort_unmarshal_error);
604 goto local_abort;
605 default:
606 abort_code = RX_CALL_DEAD;
607 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
608 abort_code, ret,
609 afs_abort_general_error);
610 goto local_abort;
611 }
612 }
613
614 done:
615 if (call->type->done)
616 call->type->done(call);
617 out:
618 _leave("");
619 return;
620
621 local_abort:
622 abort_code = 0;
623 call_complete:
624 afs_set_call_complete(call, ret, remote_abort);
625 goto done;
626 }
627
628 /*
629 * Wait synchronously for a call to complete.
630 */
afs_wait_for_call_to_complete(struct afs_call * call)631 void afs_wait_for_call_to_complete(struct afs_call *call)
632 {
633 bool rxrpc_complete = false;
634
635 _enter("");
636
637 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
638 DECLARE_WAITQUEUE(myself, current);
639
640 add_wait_queue(&call->waitq, &myself);
641 for (;;) {
642 set_current_state(TASK_UNINTERRUPTIBLE);
643
644 /* deliver any messages that are in the queue */
645 if (!afs_check_call_state(call, AFS_CALL_COMPLETE) &&
646 call->need_attention) {
647 call->need_attention = false;
648 __set_current_state(TASK_RUNNING);
649 afs_deliver_to_call(call);
650 continue;
651 }
652
653 if (afs_check_call_state(call, AFS_CALL_COMPLETE))
654 break;
655
656 if (!rxrpc_kernel_check_life(call->net->socket, call->rxcall)) {
657 /* rxrpc terminated the call. */
658 rxrpc_complete = true;
659 break;
660 }
661
662 schedule();
663 }
664
665 remove_wait_queue(&call->waitq, &myself);
666 __set_current_state(TASK_RUNNING);
667 }
668
669 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
670 if (rxrpc_complete) {
671 afs_set_call_complete(call, call->error, call->abort_code);
672 } else {
673 /* Kill off the call if it's still live. */
674 _debug("call interrupted");
675 if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
676 RX_USER_ABORT, -EINTR,
677 afs_abort_interrupted))
678 afs_set_call_complete(call, -EINTR, 0);
679 }
680 }
681 }
682
683 /*
684 * wake up a waiting call
685 */
afs_wake_up_call_waiter(struct sock * sk,struct rxrpc_call * rxcall,unsigned long call_user_ID)686 static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
687 unsigned long call_user_ID)
688 {
689 struct afs_call *call = (struct afs_call *)call_user_ID;
690
691 call->need_attention = true;
692 wake_up(&call->waitq);
693 }
694
695 /*
696 * Wake up an asynchronous call. The caller is holding the call notify
697 * spinlock around this, so we can't call afs_put_call().
698 */
afs_wake_up_async_call(struct sock * sk,struct rxrpc_call * rxcall,unsigned long call_user_ID)699 static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
700 unsigned long call_user_ID)
701 {
702 struct afs_call *call = (struct afs_call *)call_user_ID;
703 int r;
704
705 trace_afs_notify_call(rxcall, call);
706 call->need_attention = true;
707
708 if (__refcount_inc_not_zero(&call->ref, &r)) {
709 trace_afs_call(call->debug_id, afs_call_trace_wake, r + 1,
710 atomic_read(&call->net->nr_outstanding_calls),
711 __builtin_return_address(0));
712
713 if (!queue_work(afs_async_calls, &call->async_work))
714 afs_deferred_put_call(call);
715 }
716 }
717
718 /*
719 * Perform I/O processing on an asynchronous call. The work item carries a ref
720 * to the call struct that we either need to release or to pass on.
721 */
afs_process_async_call(struct work_struct * work)722 static void afs_process_async_call(struct work_struct *work)
723 {
724 struct afs_call *call = container_of(work, struct afs_call, async_work);
725
726 _enter("");
727
728 if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
729 call->need_attention = false;
730 afs_deliver_to_call(call);
731 }
732
733 afs_put_call(call);
734 _leave("");
735 }
736
afs_rx_attach(struct rxrpc_call * rxcall,unsigned long user_call_ID)737 static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
738 {
739 struct afs_call *call = (struct afs_call *)user_call_ID;
740
741 call->rxcall = rxcall;
742 }
743
744 /*
745 * Charge the incoming call preallocation.
746 */
afs_charge_preallocation(struct work_struct * work)747 void afs_charge_preallocation(struct work_struct *work)
748 {
749 struct afs_net *net =
750 container_of(work, struct afs_net, charge_preallocation_work);
751 struct afs_call *call = net->spare_incoming_call;
752
753 while (READ_ONCE(net->live)) {
754 if (!call) {
755 call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL);
756 if (!call)
757 break;
758
759 call->drop_ref = true;
760 call->async = true;
761 call->state = AFS_CALL_SV_AWAIT_OP_ID;
762 init_waitqueue_head(&call->waitq);
763 afs_extract_to_tmp(call);
764 }
765
766 if (rxrpc_kernel_charge_accept(net->socket,
767 afs_wake_up_async_call,
768 (unsigned long)call,
769 GFP_KERNEL,
770 call->debug_id) < 0)
771 break;
772 call = NULL;
773 }
774 net->spare_incoming_call = call;
775 }
776
777 /*
778 * Discard a preallocated call when a socket is shut down.
779 */
afs_rx_discard_new_call(struct rxrpc_call * rxcall,unsigned long user_call_ID)780 static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,
781 unsigned long user_call_ID)
782 {
783 struct afs_call *call = (struct afs_call *)user_call_ID;
784
785 call->rxcall = NULL;
786 afs_put_call(call);
787 }
788
789 /*
790 * Notification of an incoming call.
791 */
afs_rx_new_call(struct sock * sk,struct rxrpc_call * rxcall,unsigned long user_call_ID)792 static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
793 unsigned long user_call_ID)
794 {
795 struct afs_call *call = (struct afs_call *)user_call_ID;
796 struct afs_net *net = afs_sock2net(sk);
797
798 call->peer = rxrpc_kernel_get_call_peer(sk->sk_socket, call->rxcall);
799 call->server = afs_find_server(call->peer);
800 if (!call->server)
801 trace_afs_cm_no_server(call, rxrpc_kernel_remote_srx(call->peer));
802
803 if (net->live)
804 queue_work(afs_wq, &net->charge_preallocation_work);
805 }
806
807 /*
808 * Grab the operation ID from an incoming cache manager call. The socket
809 * buffer is discarded on error or if we don't yet have sufficient data.
810 */
afs_deliver_cm_op_id(struct afs_call * call)811 static int afs_deliver_cm_op_id(struct afs_call *call)
812 {
813 int ret;
814
815 _enter("{%zu}", iov_iter_count(call->iter));
816
817 /* the operation ID forms the first four bytes of the request data */
818 ret = afs_extract_data(call, true);
819 if (ret < 0)
820 return ret;
821
822 call->operation_ID = ntohl(call->tmp);
823 afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST);
824
825 /* ask the cache manager to route the call (it'll change the call type
826 * if successful) */
827 if (!afs_cm_incoming_call(call))
828 return -ENOTSUPP;
829
830 call->security_ix = rxrpc_kernel_query_call_security(call->rxcall,
831 &call->service_id,
832 &call->enctype);
833
834 trace_afs_cb_call(call);
835 call->work.func = call->type->work;
836
837 /* pass responsibility for the remainder of this message off to the
838 * cache manager op */
839 return call->type->deliver(call);
840 }
841
842 /*
843 * Advance the AFS call state when an RxRPC service call ends the transmit
844 * phase.
845 */
afs_notify_end_reply_tx(struct sock * sock,struct rxrpc_call * rxcall,unsigned long call_user_ID)846 static void afs_notify_end_reply_tx(struct sock *sock,
847 struct rxrpc_call *rxcall,
848 unsigned long call_user_ID)
849 {
850 struct afs_call *call = (struct afs_call *)call_user_ID;
851
852 afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK);
853 }
854
855 /*
856 * send an empty reply
857 */
afs_send_empty_reply(struct afs_call * call)858 void afs_send_empty_reply(struct afs_call *call)
859 {
860 struct afs_net *net = call->net;
861 struct msghdr msg;
862
863 _enter("");
864
865 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0);
866
867 msg.msg_name = NULL;
868 msg.msg_namelen = 0;
869 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, NULL, 0, 0);
870 msg.msg_control = NULL;
871 msg.msg_controllen = 0;
872 msg.msg_flags = 0;
873
874 switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0,
875 afs_notify_end_reply_tx)) {
876 case 0:
877 _leave(" [replied]");
878 return;
879
880 case -ENOMEM:
881 _debug("oom");
882 rxrpc_kernel_abort_call(net->socket, call->rxcall,
883 RXGEN_SS_MARSHAL, -ENOMEM,
884 afs_abort_oom);
885 fallthrough;
886 default:
887 _leave(" [error]");
888 return;
889 }
890 }
891
892 /*
893 * send a simple reply
894 */
afs_send_simple_reply(struct afs_call * call,const void * buf,size_t len)895 void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
896 {
897 struct afs_net *net = call->net;
898 struct msghdr msg;
899 struct kvec iov[1];
900 int n;
901
902 _enter("");
903
904 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len);
905
906 iov[0].iov_base = (void *) buf;
907 iov[0].iov_len = len;
908 msg.msg_name = NULL;
909 msg.msg_namelen = 0;
910 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, len);
911 msg.msg_control = NULL;
912 msg.msg_controllen = 0;
913 msg.msg_flags = 0;
914
915 n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len,
916 afs_notify_end_reply_tx);
917 if (n >= 0) {
918 /* Success */
919 _leave(" [replied]");
920 return;
921 }
922
923 if (n == -ENOMEM) {
924 _debug("oom");
925 rxrpc_kernel_abort_call(net->socket, call->rxcall,
926 RXGEN_SS_MARSHAL, -ENOMEM,
927 afs_abort_oom);
928 }
929 _leave(" [error]");
930 }
931
932 /*
933 * Extract a piece of data from the received data socket buffers.
934 */
afs_extract_data(struct afs_call * call,bool want_more)935 int afs_extract_data(struct afs_call *call, bool want_more)
936 {
937 struct afs_net *net = call->net;
938 struct iov_iter *iter = call->iter;
939 enum afs_call_state state;
940 u32 remote_abort = 0;
941 int ret;
942
943 _enter("{%s,%zu,%zu},%d",
944 call->type->name, call->iov_len, iov_iter_count(iter), want_more);
945
946 ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter,
947 &call->iov_len, want_more, &remote_abort,
948 &call->service_id);
949 trace_afs_receive_data(call, call->iter, want_more, ret);
950 if (ret == 0 || ret == -EAGAIN)
951 return ret;
952
953 state = READ_ONCE(call->state);
954 if (ret == 1) {
955 switch (state) {
956 case AFS_CALL_CL_AWAIT_REPLY:
957 afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY);
958 break;
959 case AFS_CALL_SV_AWAIT_REQUEST:
960 afs_set_call_state(call, state, AFS_CALL_SV_REPLYING);
961 break;
962 case AFS_CALL_COMPLETE:
963 kdebug("prem complete %d", call->error);
964 return afs_io_error(call, afs_io_error_extract);
965 default:
966 break;
967 }
968 return 0;
969 }
970
971 afs_set_call_complete(call, ret, remote_abort);
972 return ret;
973 }
974
975 /*
976 * Log protocol error production.
977 */
afs_protocol_error(struct afs_call * call,enum afs_eproto_cause cause)978 noinline int afs_protocol_error(struct afs_call *call,
979 enum afs_eproto_cause cause)
980 {
981 trace_afs_protocol_error(call, cause);
982 if (call)
983 call->unmarshalling_error = true;
984 return -EBADMSG;
985 }
986
987 /*
988 * Wake up OOB notification processing.
989 */
afs_rx_notify_oob(struct sock * sk,struct sk_buff * oob)990 static void afs_rx_notify_oob(struct sock *sk, struct sk_buff *oob)
991 {
992 struct afs_net *net = sk->sk_user_data;
993
994 if (READ_ONCE(net->live))
995 queue_work(afs_wq, &net->rx_oob_work);
996 }
997