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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
17struct workqueue_struct *afs_async_calls;
18
19static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
20static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
21static void afs_process_async_call(struct work_struct *);
22static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
23static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
24static int afs_deliver_cm_op_id(struct afs_call *);
25
26/* asynchronous incoming call initial processing */
27static const struct afs_call_type afs_RXCMxxxx = {
28 .name = "CB.xxxx",
29 .deliver = afs_deliver_cm_op_id,
30};
31
32/*
33 * open an RxRPC socket and bind it to be a server for callback notifications
34 * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
35 */
36int afs_open_socket(struct afs_net *net)
37{
38 struct sockaddr_rxrpc srx;
39 struct socket *socket;
40 int ret;
41
42 _enter("");
43
44 ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket);
45 if (ret < 0)
46 goto error_1;
47
48 socket->sk->sk_allocation = GFP_NOFS;
49
50 /* bind the callback manager's address to make this a server socket */
51 memset(&srx, 0, sizeof(srx));
52 srx.srx_family = AF_RXRPC;
53 srx.srx_service = CM_SERVICE;
54 srx.transport_type = SOCK_DGRAM;
55 srx.transport_len = sizeof(srx.transport.sin6);
56 srx.transport.sin6.sin6_family = AF_INET6;
57 srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);
58
59 ret = rxrpc_sock_set_min_security_level(socket->sk,
60 RXRPC_SECURITY_ENCRYPT);
61 if (ret < 0)
62 goto error_2;
63
64 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
65 if (ret == -EADDRINUSE) {
66 srx.transport.sin6.sin6_port = 0;
67 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
68 }
69 if (ret < 0)
70 goto error_2;
71
72 srx.srx_service = YFS_CM_SERVICE;
73 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
74 if (ret < 0)
75 goto error_2;
76
77 /* Ideally, we'd turn on service upgrade here, but we can't because
78 * OpenAFS is buggy and leaks the userStatus field from packet to
79 * packet and between FS packets and CB packets - so if we try to do an
80 * upgrade on an FS packet, OpenAFS will leak that into the CB packet
81 * it sends back to us.
82 */
83
84 rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,
85 afs_rx_discard_new_call);
86
87 ret = kernel_listen(socket, INT_MAX);
88 if (ret < 0)
89 goto error_2;
90
91 net->socket = socket;
92 afs_charge_preallocation(&net->charge_preallocation_work);
93 _leave(" = 0");
94 return 0;
95
96error_2:
97 sock_release(socket);
98error_1:
99 _leave(" = %d", ret);
100 return ret;
101}
102
103/*
104 * close the RxRPC socket AFS was using
105 */
106void afs_close_socket(struct afs_net *net)
107{
108 _enter("");
109
110 kernel_listen(net->socket, 0);
111 flush_workqueue(afs_async_calls);
112
113 if (net->spare_incoming_call) {
114 afs_put_call(net->spare_incoming_call);
115 net->spare_incoming_call = NULL;
116 }
117
118 _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls));
119 wait_var_event(&net->nr_outstanding_calls,
120 !atomic_read(&net->nr_outstanding_calls));
121 _debug("no outstanding calls");
122
123 kernel_sock_shutdown(net->socket, SHUT_RDWR);
124 flush_workqueue(afs_async_calls);
125 sock_release(net->socket);
126
127 _debug("dework");
128 _leave("");
129}
130
131/*
132 * Allocate a call.
133 */
134static struct afs_call *afs_alloc_call(struct afs_net *net,
135 const struct afs_call_type *type,
136 gfp_t gfp)
137{
138 struct afs_call *call;
139 int o;
140
141 call = kzalloc(sizeof(*call), gfp);
142 if (!call)
143 return NULL;
144
145 call->type = type;
146 call->net = net;
147 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
148 atomic_set(&call->usage, 1);
149 INIT_WORK(&call->async_work, afs_process_async_call);
150 init_waitqueue_head(&call->waitq);
151 spin_lock_init(&call->state_lock);
152 call->iter = &call->def_iter;
153
154 o = atomic_inc_return(&net->nr_outstanding_calls);
155 trace_afs_call(call, afs_call_trace_alloc, 1, o,
156 __builtin_return_address(0));
157 return call;
158}
159
160/*
161 * Dispose of a reference on a call.
162 */
163void afs_put_call(struct afs_call *call)
164{
165 struct afs_net *net = call->net;
166 int n = atomic_dec_return(&call->usage);
167 int o = atomic_read(&net->nr_outstanding_calls);
168
169 trace_afs_call(call, afs_call_trace_put, n, o,
170 __builtin_return_address(0));
171
172 ASSERTCMP(n, >=, 0);
173 if (n == 0) {
174 ASSERT(!work_pending(&call->async_work));
175 ASSERT(call->type->name != NULL);
176
177 if (call->rxcall) {
178 rxrpc_kernel_end_call(net->socket, call->rxcall);
179 call->rxcall = NULL;
180 }
181 if (call->type->destructor)
182 call->type->destructor(call);
183
184 afs_unuse_server_notime(call->net, call->server, afs_server_trace_put_call);
185 afs_put_addrlist(call->alist);
186 kfree(call->request);
187
188 trace_afs_call(call, afs_call_trace_free, 0, o,
189 __builtin_return_address(0));
190 kfree(call);
191
192 o = atomic_dec_return(&net->nr_outstanding_calls);
193 if (o == 0)
194 wake_up_var(&net->nr_outstanding_calls);
195 }
196}
197
198static struct afs_call *afs_get_call(struct afs_call *call,
199 enum afs_call_trace why)
200{
201 int u = atomic_inc_return(&call->usage);
202
203 trace_afs_call(call, why, u,
204 atomic_read(&call->net->nr_outstanding_calls),
205 __builtin_return_address(0));
206 return call;
207}
208
209/*
210 * Queue the call for actual work.
211 */
212static void afs_queue_call_work(struct afs_call *call)
213{
214 if (call->type->work) {
215 INIT_WORK(&call->work, call->type->work);
216
217 afs_get_call(call, afs_call_trace_work);
218 if (!queue_work(afs_wq, &call->work))
219 afs_put_call(call);
220 }
221}
222
223/*
224 * allocate a call with flat request and reply buffers
225 */
226struct afs_call *afs_alloc_flat_call(struct afs_net *net,
227 const struct afs_call_type *type,
228 size_t request_size, size_t reply_max)
229{
230 struct afs_call *call;
231
232 call = afs_alloc_call(net, type, GFP_NOFS);
233 if (!call)
234 goto nomem_call;
235
236 if (request_size) {
237 call->request_size = request_size;
238 call->request = kmalloc(request_size, GFP_NOFS);
239 if (!call->request)
240 goto nomem_free;
241 }
242
243 if (reply_max) {
244 call->reply_max = reply_max;
245 call->buffer = kmalloc(reply_max, GFP_NOFS);
246 if (!call->buffer)
247 goto nomem_free;
248 }
249
250 afs_extract_to_buf(call, call->reply_max);
251 call->operation_ID = type->op;
252 init_waitqueue_head(&call->waitq);
253 return call;
254
255nomem_free:
256 afs_put_call(call);
257nomem_call:
258 return NULL;
259}
260
261/*
262 * clean up a call with flat buffer
263 */
264void afs_flat_call_destructor(struct afs_call *call)
265{
266 _enter("");
267
268 kfree(call->request);
269 call->request = NULL;
270 kfree(call->buffer);
271 call->buffer = NULL;
272}
273
274/*
275 * Advance the AFS call state when the RxRPC call ends the transmit phase.
276 */
277static void afs_notify_end_request_tx(struct sock *sock,
278 struct rxrpc_call *rxcall,
279 unsigned long call_user_ID)
280{
281 struct afs_call *call = (struct afs_call *)call_user_ID;
282
283 afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY);
284}
285
286/*
287 * Initiate a call and synchronously queue up the parameters for dispatch. Any
288 * error is stored into the call struct, which the caller must check for.
289 */
290void afs_make_call(struct afs_addr_cursor *ac, struct afs_call *call, gfp_t gfp)
291{
292 struct sockaddr_rxrpc *srx = &ac->alist->addrs[ac->index];
293 struct rxrpc_call *rxcall;
294 struct msghdr msg;
295 struct kvec iov[1];
296 size_t len;
297 s64 tx_total_len;
298 int ret;
299
300 _enter(",{%pISp},", &srx->transport);
301
302 ASSERT(call->type != NULL);
303 ASSERT(call->type->name != NULL);
304
305 _debug("____MAKE %p{%s,%x} [%d]____",
306 call, call->type->name, key_serial(call->key),
307 atomic_read(&call->net->nr_outstanding_calls));
308
309 call->addr_ix = ac->index;
310 call->alist = afs_get_addrlist(ac->alist);
311
312 /* Work out the length we're going to transmit. This is awkward for
313 * calls such as FS.StoreData where there's an extra injection of data
314 * after the initial fixed part.
315 */
316 tx_total_len = call->request_size;
317 if (call->write_iter)
318 tx_total_len += iov_iter_count(call->write_iter);
319
320 /* If the call is going to be asynchronous, we need an extra ref for
321 * the call to hold itself so the caller need not hang on to its ref.
322 */
323 if (call->async) {
324 afs_get_call(call, afs_call_trace_get);
325 call->drop_ref = true;
326 }
327
328 /* create a call */
329 rxcall = rxrpc_kernel_begin_call(call->net->socket, srx, call->key,
330 (unsigned long)call,
331 tx_total_len, gfp,
332 (call->async ?
333 afs_wake_up_async_call :
334 afs_wake_up_call_waiter),
335 call->upgrade,
336 (call->intr ? RXRPC_PREINTERRUPTIBLE :
337 RXRPC_UNINTERRUPTIBLE),
338 call->debug_id);
339 if (IS_ERR(rxcall)) {
340 ret = PTR_ERR(rxcall);
341 call->error = ret;
342 goto error_kill_call;
343 }
344
345 call->rxcall = rxcall;
346
347 if (call->max_lifespan)
348 rxrpc_kernel_set_max_life(call->net->socket, rxcall,
349 call->max_lifespan);
350
351 /* send the request */
352 iov[0].iov_base = call->request;
353 iov[0].iov_len = call->request_size;
354
355 msg.msg_name = NULL;
356 msg.msg_namelen = 0;
357 iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, call->request_size);
358 msg.msg_control = NULL;
359 msg.msg_controllen = 0;
360 msg.msg_flags = MSG_WAITALL | (call->write_iter ? MSG_MORE : 0);
361
362 ret = rxrpc_kernel_send_data(call->net->socket, rxcall,
363 &msg, call->request_size,
364 afs_notify_end_request_tx);
365 if (ret < 0)
366 goto error_do_abort;
367
368 if (call->write_iter) {
369 msg.msg_iter = *call->write_iter;
370 msg.msg_flags &= ~MSG_MORE;
371 trace_afs_send_data(call, &msg);
372
373 ret = rxrpc_kernel_send_data(call->net->socket,
374 call->rxcall, &msg,
375 iov_iter_count(&msg.msg_iter),
376 afs_notify_end_request_tx);
377 *call->write_iter = msg.msg_iter;
378
379 trace_afs_sent_data(call, &msg, ret);
380 if (ret < 0)
381 goto error_do_abort;
382 }
383
384 /* Note that at this point, we may have received the reply or an abort
385 * - and an asynchronous call may already have completed.
386 *
387 * afs_wait_for_call_to_complete(call, ac)
388 * must be called to synchronously clean up.
389 */
390 return;
391
392error_do_abort:
393 if (ret != -ECONNABORTED) {
394 rxrpc_kernel_abort_call(call->net->socket, rxcall,
395 RX_USER_ABORT, ret, "KSD");
396 } else {
397 len = 0;
398 iov_iter_kvec(&msg.msg_iter, READ, NULL, 0, 0);
399 rxrpc_kernel_recv_data(call->net->socket, rxcall,
400 &msg.msg_iter, &len, false,
401 &call->abort_code, &call->service_id);
402 ac->abort_code = call->abort_code;
403 ac->responded = true;
404 }
405 call->error = ret;
406 trace_afs_call_done(call);
407error_kill_call:
408 if (call->type->done)
409 call->type->done(call);
410
411 /* We need to dispose of the extra ref we grabbed for an async call.
412 * The call, however, might be queued on afs_async_calls and we need to
413 * make sure we don't get any more notifications that might requeue it.
414 */
415 if (call->rxcall) {
416 rxrpc_kernel_end_call(call->net->socket, call->rxcall);
417 call->rxcall = NULL;
418 }
419 if (call->async) {
420 if (cancel_work_sync(&call->async_work))
421 afs_put_call(call);
422 afs_put_call(call);
423 }
424
425 ac->error = ret;
426 call->state = AFS_CALL_COMPLETE;
427 _leave(" = %d", ret);
428}
429
430/*
431 * Log remote abort codes that indicate that we have a protocol disagreement
432 * with the server.
433 */
434static void afs_log_error(struct afs_call *call, s32 remote_abort)
435{
436 static int max = 0;
437 const char *msg;
438 int m;
439
440 switch (remote_abort) {
441 case RX_EOF: msg = "unexpected EOF"; break;
442 case RXGEN_CC_MARSHAL: msg = "client marshalling"; break;
443 case RXGEN_CC_UNMARSHAL: msg = "client unmarshalling"; break;
444 case RXGEN_SS_MARSHAL: msg = "server marshalling"; break;
445 case RXGEN_SS_UNMARSHAL: msg = "server unmarshalling"; break;
446 case RXGEN_DECODE: msg = "opcode decode"; break;
447 case RXGEN_SS_XDRFREE: msg = "server XDR cleanup"; break;
448 case RXGEN_CC_XDRFREE: msg = "client XDR cleanup"; break;
449 case -32: msg = "insufficient data"; break;
450 default:
451 return;
452 }
453
454 m = max;
455 if (m < 3) {
456 max = m + 1;
457 pr_notice("kAFS: Peer reported %s failure on %s [%pISp]\n",
458 msg, call->type->name,
459 &call->alist->addrs[call->addr_ix].transport);
460 }
461}
462
463/*
464 * deliver messages to a call
465 */
466static void afs_deliver_to_call(struct afs_call *call)
467{
468 enum afs_call_state state;
469 size_t len;
470 u32 abort_code, remote_abort = 0;
471 int ret;
472
473 _enter("%s", call->type->name);
474
475 while (state = READ_ONCE(call->state),
476 state == AFS_CALL_CL_AWAIT_REPLY ||
477 state == AFS_CALL_SV_AWAIT_OP_ID ||
478 state == AFS_CALL_SV_AWAIT_REQUEST ||
479 state == AFS_CALL_SV_AWAIT_ACK
480 ) {
481 if (state == AFS_CALL_SV_AWAIT_ACK) {
482 len = 0;
483 iov_iter_kvec(&call->def_iter, READ, NULL, 0, 0);
484 ret = rxrpc_kernel_recv_data(call->net->socket,
485 call->rxcall, &call->def_iter,
486 &len, false, &remote_abort,
487 &call->service_id);
488 trace_afs_receive_data(call, &call->def_iter, false, ret);
489
490 if (ret == -EINPROGRESS || ret == -EAGAIN)
491 return;
492 if (ret < 0 || ret == 1) {
493 if (ret == 1)
494 ret = 0;
495 goto call_complete;
496 }
497 return;
498 }
499
500 if (!call->have_reply_time &&
501 rxrpc_kernel_get_reply_time(call->net->socket,
502 call->rxcall,
503 &call->reply_time))
504 call->have_reply_time = true;
505
506 ret = call->type->deliver(call);
507 state = READ_ONCE(call->state);
508 if (ret == 0 && call->unmarshalling_error)
509 ret = -EBADMSG;
510 switch (ret) {
511 case 0:
512 afs_queue_call_work(call);
513 if (state == AFS_CALL_CL_PROC_REPLY) {
514 if (call->op)
515 set_bit(AFS_SERVER_FL_MAY_HAVE_CB,
516 &call->op->server->flags);
517 goto call_complete;
518 }
519 ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY);
520 goto done;
521 case -EINPROGRESS:
522 case -EAGAIN:
523 goto out;
524 case -ECONNABORTED:
525 ASSERTCMP(state, ==, AFS_CALL_COMPLETE);
526 afs_log_error(call, call->abort_code);
527 goto done;
528 case -ENOTSUPP:
529 abort_code = RXGEN_OPCODE;
530 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
531 abort_code, ret, "KIV");
532 goto local_abort;
533 case -EIO:
534 pr_err("kAFS: Call %u in bad state %u\n",
535 call->debug_id, state);
536 fallthrough;
537 case -ENODATA:
538 case -EBADMSG:
539 case -EMSGSIZE:
540 abort_code = RXGEN_CC_UNMARSHAL;
541 if (state != AFS_CALL_CL_AWAIT_REPLY)
542 abort_code = RXGEN_SS_UNMARSHAL;
543 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
544 abort_code, ret, "KUM");
545 goto local_abort;
546 default:
547 abort_code = RX_USER_ABORT;
548 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
549 abort_code, ret, "KER");
550 goto local_abort;
551 }
552 }
553
554done:
555 if (call->type->done)
556 call->type->done(call);
557out:
558 _leave("");
559 return;
560
561local_abort:
562 abort_code = 0;
563call_complete:
564 afs_set_call_complete(call, ret, remote_abort);
565 state = AFS_CALL_COMPLETE;
566 goto done;
567}
568
569/*
570 * Wait synchronously for a call to complete and clean up the call struct.
571 */
572long afs_wait_for_call_to_complete(struct afs_call *call,
573 struct afs_addr_cursor *ac)
574{
575 long ret;
576 bool rxrpc_complete = false;
577
578 DECLARE_WAITQUEUE(myself, current);
579
580 _enter("");
581
582 ret = call->error;
583 if (ret < 0)
584 goto out;
585
586 add_wait_queue(&call->waitq, &myself);
587 for (;;) {
588 set_current_state(TASK_UNINTERRUPTIBLE);
589
590 /* deliver any messages that are in the queue */
591 if (!afs_check_call_state(call, AFS_CALL_COMPLETE) &&
592 call->need_attention) {
593 call->need_attention = false;
594 __set_current_state(TASK_RUNNING);
595 afs_deliver_to_call(call);
596 continue;
597 }
598
599 if (afs_check_call_state(call, AFS_CALL_COMPLETE))
600 break;
601
602 if (!rxrpc_kernel_check_life(call->net->socket, call->rxcall)) {
603 /* rxrpc terminated the call. */
604 rxrpc_complete = true;
605 break;
606 }
607
608 schedule();
609 }
610
611 remove_wait_queue(&call->waitq, &myself);
612 __set_current_state(TASK_RUNNING);
613
614 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
615 if (rxrpc_complete) {
616 afs_set_call_complete(call, call->error, call->abort_code);
617 } else {
618 /* Kill off the call if it's still live. */
619 _debug("call interrupted");
620 if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
621 RX_USER_ABORT, -EINTR, "KWI"))
622 afs_set_call_complete(call, -EINTR, 0);
623 }
624 }
625
626 spin_lock_bh(&call->state_lock);
627 ac->abort_code = call->abort_code;
628 ac->error = call->error;
629 spin_unlock_bh(&call->state_lock);
630
631 ret = ac->error;
632 switch (ret) {
633 case 0:
634 ret = call->ret0;
635 call->ret0 = 0;
636
637 fallthrough;
638 case -ECONNABORTED:
639 ac->responded = true;
640 break;
641 }
642
643out:
644 _debug("call complete");
645 afs_put_call(call);
646 _leave(" = %p", (void *)ret);
647 return ret;
648}
649
650/*
651 * wake up a waiting call
652 */
653static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
654 unsigned long call_user_ID)
655{
656 struct afs_call *call = (struct afs_call *)call_user_ID;
657
658 call->need_attention = true;
659 wake_up(&call->waitq);
660}
661
662/*
663 * wake up an asynchronous call
664 */
665static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
666 unsigned long call_user_ID)
667{
668 struct afs_call *call = (struct afs_call *)call_user_ID;
669 int u;
670
671 trace_afs_notify_call(rxcall, call);
672 call->need_attention = true;
673
674 u = atomic_fetch_add_unless(&call->usage, 1, 0);
675 if (u != 0) {
676 trace_afs_call(call, afs_call_trace_wake, u + 1,
677 atomic_read(&call->net->nr_outstanding_calls),
678 __builtin_return_address(0));
679
680 if (!queue_work(afs_async_calls, &call->async_work))
681 afs_put_call(call);
682 }
683}
684
685/*
686 * Perform I/O processing on an asynchronous call. The work item carries a ref
687 * to the call struct that we either need to release or to pass on.
688 */
689static void afs_process_async_call(struct work_struct *work)
690{
691 struct afs_call *call = container_of(work, struct afs_call, async_work);
692
693 _enter("");
694
695 if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
696 call->need_attention = false;
697 afs_deliver_to_call(call);
698 }
699
700 afs_put_call(call);
701 _leave("");
702}
703
704static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
705{
706 struct afs_call *call = (struct afs_call *)user_call_ID;
707
708 call->rxcall = rxcall;
709}
710
711/*
712 * Charge the incoming call preallocation.
713 */
714void afs_charge_preallocation(struct work_struct *work)
715{
716 struct afs_net *net =
717 container_of(work, struct afs_net, charge_preallocation_work);
718 struct afs_call *call = net->spare_incoming_call;
719
720 for (;;) {
721 if (!call) {
722 call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL);
723 if (!call)
724 break;
725
726 call->drop_ref = true;
727 call->async = true;
728 call->state = AFS_CALL_SV_AWAIT_OP_ID;
729 init_waitqueue_head(&call->waitq);
730 afs_extract_to_tmp(call);
731 }
732
733 if (rxrpc_kernel_charge_accept(net->socket,
734 afs_wake_up_async_call,
735 afs_rx_attach,
736 (unsigned long)call,
737 GFP_KERNEL,
738 call->debug_id) < 0)
739 break;
740 call = NULL;
741 }
742 net->spare_incoming_call = call;
743}
744
745/*
746 * Discard a preallocated call when a socket is shut down.
747 */
748static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,
749 unsigned long user_call_ID)
750{
751 struct afs_call *call = (struct afs_call *)user_call_ID;
752
753 call->rxcall = NULL;
754 afs_put_call(call);
755}
756
757/*
758 * Notification of an incoming call.
759 */
760static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
761 unsigned long user_call_ID)
762{
763 struct afs_net *net = afs_sock2net(sk);
764
765 queue_work(afs_wq, &net->charge_preallocation_work);
766}
767
768/*
769 * Grab the operation ID from an incoming cache manager call. The socket
770 * buffer is discarded on error or if we don't yet have sufficient data.
771 */
772static int afs_deliver_cm_op_id(struct afs_call *call)
773{
774 int ret;
775
776 _enter("{%zu}", iov_iter_count(call->iter));
777
778 /* the operation ID forms the first four bytes of the request data */
779 ret = afs_extract_data(call, true);
780 if (ret < 0)
781 return ret;
782
783 call->operation_ID = ntohl(call->tmp);
784 afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST);
785
786 /* ask the cache manager to route the call (it'll change the call type
787 * if successful) */
788 if (!afs_cm_incoming_call(call))
789 return -ENOTSUPP;
790
791 trace_afs_cb_call(call);
792
793 /* pass responsibility for the remainer of this message off to the
794 * cache manager op */
795 return call->type->deliver(call);
796}
797
798/*
799 * Advance the AFS call state when an RxRPC service call ends the transmit
800 * phase.
801 */
802static void afs_notify_end_reply_tx(struct sock *sock,
803 struct rxrpc_call *rxcall,
804 unsigned long call_user_ID)
805{
806 struct afs_call *call = (struct afs_call *)call_user_ID;
807
808 afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK);
809}
810
811/*
812 * send an empty reply
813 */
814void afs_send_empty_reply(struct afs_call *call)
815{
816 struct afs_net *net = call->net;
817 struct msghdr msg;
818
819 _enter("");
820
821 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0);
822
823 msg.msg_name = NULL;
824 msg.msg_namelen = 0;
825 iov_iter_kvec(&msg.msg_iter, WRITE, NULL, 0, 0);
826 msg.msg_control = NULL;
827 msg.msg_controllen = 0;
828 msg.msg_flags = 0;
829
830 switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0,
831 afs_notify_end_reply_tx)) {
832 case 0:
833 _leave(" [replied]");
834 return;
835
836 case -ENOMEM:
837 _debug("oom");
838 rxrpc_kernel_abort_call(net->socket, call->rxcall,
839 RX_USER_ABORT, -ENOMEM, "KOO");
840 fallthrough;
841 default:
842 _leave(" [error]");
843 return;
844 }
845}
846
847/*
848 * send a simple reply
849 */
850void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
851{
852 struct afs_net *net = call->net;
853 struct msghdr msg;
854 struct kvec iov[1];
855 int n;
856
857 _enter("");
858
859 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len);
860
861 iov[0].iov_base = (void *) buf;
862 iov[0].iov_len = len;
863 msg.msg_name = NULL;
864 msg.msg_namelen = 0;
865 iov_iter_kvec(&msg.msg_iter, WRITE, iov, 1, len);
866 msg.msg_control = NULL;
867 msg.msg_controllen = 0;
868 msg.msg_flags = 0;
869
870 n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len,
871 afs_notify_end_reply_tx);
872 if (n >= 0) {
873 /* Success */
874 _leave(" [replied]");
875 return;
876 }
877
878 if (n == -ENOMEM) {
879 _debug("oom");
880 rxrpc_kernel_abort_call(net->socket, call->rxcall,
881 RX_USER_ABORT, -ENOMEM, "KOO");
882 }
883 _leave(" [error]");
884}
885
886/*
887 * Extract a piece of data from the received data socket buffers.
888 */
889int afs_extract_data(struct afs_call *call, bool want_more)
890{
891 struct afs_net *net = call->net;
892 struct iov_iter *iter = call->iter;
893 enum afs_call_state state;
894 u32 remote_abort = 0;
895 int ret;
896
897 _enter("{%s,%zu,%zu},%d",
898 call->type->name, call->iov_len, iov_iter_count(iter), want_more);
899
900 ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter,
901 &call->iov_len, want_more, &remote_abort,
902 &call->service_id);
903 if (ret == 0 || ret == -EAGAIN)
904 return ret;
905
906 state = READ_ONCE(call->state);
907 if (ret == 1) {
908 switch (state) {
909 case AFS_CALL_CL_AWAIT_REPLY:
910 afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY);
911 break;
912 case AFS_CALL_SV_AWAIT_REQUEST:
913 afs_set_call_state(call, state, AFS_CALL_SV_REPLYING);
914 break;
915 case AFS_CALL_COMPLETE:
916 kdebug("prem complete %d", call->error);
917 return afs_io_error(call, afs_io_error_extract);
918 default:
919 break;
920 }
921 return 0;
922 }
923
924 afs_set_call_complete(call, ret, remote_abort);
925 return ret;
926}
927
928/*
929 * Log protocol error production.
930 */
931noinline int afs_protocol_error(struct afs_call *call,
932 enum afs_eproto_cause cause)
933{
934 trace_afs_protocol_error(call, cause);
935 if (call)
936 call->unmarshalling_error = true;
937 return -EBADMSG;
938}
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
19struct workqueue_struct *afs_async_calls;
20
21static void afs_wake_up_call_waiter(struct sock *, struct rxrpc_call *, unsigned long);
22static void afs_wake_up_async_call(struct sock *, struct rxrpc_call *, unsigned long);
23static void afs_process_async_call(struct work_struct *);
24static void afs_rx_new_call(struct sock *, struct rxrpc_call *, unsigned long);
25static void afs_rx_discard_new_call(struct rxrpc_call *, unsigned long);
26static int afs_deliver_cm_op_id(struct afs_call *);
27
28/* asynchronous incoming call initial processing */
29static const struct afs_call_type afs_RXCMxxxx = {
30 .name = "CB.xxxx",
31 .deliver = afs_deliver_cm_op_id,
32};
33
34/*
35 * open an RxRPC socket and bind it to be a server for callback notifications
36 * - the socket is left in blocking mode and non-blocking ops use MSG_DONTWAIT
37 */
38int afs_open_socket(struct afs_net *net)
39{
40 struct sockaddr_rxrpc srx;
41 struct socket *socket;
42 int ret;
43
44 _enter("");
45
46 ret = sock_create_kern(net->net, AF_RXRPC, SOCK_DGRAM, PF_INET6, &socket);
47 if (ret < 0)
48 goto error_1;
49
50 socket->sk->sk_allocation = GFP_NOFS;
51
52 /* bind the callback manager's address to make this a server socket */
53 memset(&srx, 0, sizeof(srx));
54 srx.srx_family = AF_RXRPC;
55 srx.srx_service = CM_SERVICE;
56 srx.transport_type = SOCK_DGRAM;
57 srx.transport_len = sizeof(srx.transport.sin6);
58 srx.transport.sin6.sin6_family = AF_INET6;
59 srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);
60
61 ret = rxrpc_sock_set_min_security_level(socket->sk,
62 RXRPC_SECURITY_ENCRYPT);
63 if (ret < 0)
64 goto error_2;
65
66 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
67 if (ret == -EADDRINUSE) {
68 srx.transport.sin6.sin6_port = 0;
69 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
70 }
71 if (ret < 0)
72 goto error_2;
73
74 srx.srx_service = YFS_CM_SERVICE;
75 ret = kernel_bind(socket, (struct sockaddr *) &srx, sizeof(srx));
76 if (ret < 0)
77 goto error_2;
78
79 /* Ideally, we'd turn on service upgrade here, but we can't because
80 * OpenAFS is buggy and leaks the userStatus field from packet to
81 * packet and between FS packets and CB packets - so if we try to do an
82 * upgrade on an FS packet, OpenAFS will leak that into the CB packet
83 * it sends back to us.
84 */
85
86 rxrpc_kernel_new_call_notification(socket, afs_rx_new_call,
87 afs_rx_discard_new_call);
88
89 ret = kernel_listen(socket, INT_MAX);
90 if (ret < 0)
91 goto error_2;
92
93 net->socket = socket;
94 afs_charge_preallocation(&net->charge_preallocation_work);
95 _leave(" = 0");
96 return 0;
97
98error_2:
99 sock_release(socket);
100error_1:
101 _leave(" = %d", ret);
102 return ret;
103}
104
105/*
106 * close the RxRPC socket AFS was using
107 */
108void afs_close_socket(struct afs_net *net)
109{
110 _enter("");
111
112 kernel_listen(net->socket, 0);
113 flush_workqueue(afs_async_calls);
114
115 if (net->spare_incoming_call) {
116 afs_put_call(net->spare_incoming_call);
117 net->spare_incoming_call = NULL;
118 }
119
120 _debug("outstanding %u", atomic_read(&net->nr_outstanding_calls));
121 wait_var_event(&net->nr_outstanding_calls,
122 !atomic_read(&net->nr_outstanding_calls));
123 _debug("no outstanding calls");
124
125 kernel_sock_shutdown(net->socket, SHUT_RDWR);
126 flush_workqueue(afs_async_calls);
127 sock_release(net->socket);
128
129 _debug("dework");
130 _leave("");
131}
132
133/*
134 * Allocate a call.
135 */
136static struct afs_call *afs_alloc_call(struct afs_net *net,
137 const struct afs_call_type *type,
138 gfp_t gfp)
139{
140 struct afs_call *call;
141 int o;
142
143 call = kzalloc(sizeof(*call), gfp);
144 if (!call)
145 return NULL;
146
147 call->type = type;
148 call->net = net;
149 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
150 refcount_set(&call->ref, 1);
151 INIT_WORK(&call->async_work, afs_process_async_call);
152 init_waitqueue_head(&call->waitq);
153 spin_lock_init(&call->state_lock);
154 call->iter = &call->def_iter;
155
156 o = atomic_inc_return(&net->nr_outstanding_calls);
157 trace_afs_call(call->debug_id, afs_call_trace_alloc, 1, o,
158 __builtin_return_address(0));
159 return call;
160}
161
162/*
163 * Dispose of a reference on a call.
164 */
165void afs_put_call(struct afs_call *call)
166{
167 struct afs_net *net = call->net;
168 unsigned int debug_id = call->debug_id;
169 bool zero;
170 int r, o;
171
172 zero = __refcount_dec_and_test(&call->ref, &r);
173 o = atomic_read(&net->nr_outstanding_calls);
174 trace_afs_call(debug_id, afs_call_trace_put, r - 1, o,
175 __builtin_return_address(0));
176
177 if (zero) {
178 ASSERT(!work_pending(&call->async_work));
179 ASSERT(call->type->name != NULL);
180
181 rxrpc_kernel_put_peer(call->peer);
182
183 if (call->rxcall) {
184 rxrpc_kernel_shutdown_call(net->socket, call->rxcall);
185 rxrpc_kernel_put_call(net->socket, call->rxcall);
186 call->rxcall = NULL;
187 }
188 if (call->type->destructor)
189 call->type->destructor(call);
190
191 afs_unuse_server_notime(call->net, call->server, afs_server_trace_put_call);
192 kfree(call->request);
193
194 trace_afs_call(call->debug_id, afs_call_trace_free, 0, o,
195 __builtin_return_address(0));
196 kfree(call);
197
198 o = atomic_dec_return(&net->nr_outstanding_calls);
199 if (o == 0)
200 wake_up_var(&net->nr_outstanding_calls);
201 }
202}
203
204static struct afs_call *afs_get_call(struct afs_call *call,
205 enum afs_call_trace why)
206{
207 int r;
208
209 __refcount_inc(&call->ref, &r);
210
211 trace_afs_call(call->debug_id, why, r + 1,
212 atomic_read(&call->net->nr_outstanding_calls),
213 __builtin_return_address(0));
214 return call;
215}
216
217/*
218 * Queue the call for actual work.
219 */
220static void afs_queue_call_work(struct afs_call *call)
221{
222 if (call->type->work) {
223 INIT_WORK(&call->work, call->type->work);
224
225 afs_get_call(call, afs_call_trace_work);
226 if (!queue_work(afs_wq, &call->work))
227 afs_put_call(call);
228 }
229}
230
231/*
232 * allocate a call with flat request and reply buffers
233 */
234struct afs_call *afs_alloc_flat_call(struct afs_net *net,
235 const struct afs_call_type *type,
236 size_t request_size, size_t reply_max)
237{
238 struct afs_call *call;
239
240 call = afs_alloc_call(net, type, GFP_NOFS);
241 if (!call)
242 goto nomem_call;
243
244 if (request_size) {
245 call->request_size = request_size;
246 call->request = kmalloc(request_size, GFP_NOFS);
247 if (!call->request)
248 goto nomem_free;
249 }
250
251 if (reply_max) {
252 call->reply_max = reply_max;
253 call->buffer = kmalloc(reply_max, GFP_NOFS);
254 if (!call->buffer)
255 goto nomem_free;
256 }
257
258 afs_extract_to_buf(call, call->reply_max);
259 call->operation_ID = type->op;
260 init_waitqueue_head(&call->waitq);
261 return call;
262
263nomem_free:
264 afs_put_call(call);
265nomem_call:
266 return NULL;
267}
268
269/*
270 * clean up a call with flat buffer
271 */
272void afs_flat_call_destructor(struct afs_call *call)
273{
274 _enter("");
275
276 kfree(call->request);
277 call->request = NULL;
278 kfree(call->buffer);
279 call->buffer = NULL;
280}
281
282/*
283 * Advance the AFS call state when the RxRPC call ends the transmit phase.
284 */
285static void afs_notify_end_request_tx(struct sock *sock,
286 struct rxrpc_call *rxcall,
287 unsigned long call_user_ID)
288{
289 struct afs_call *call = (struct afs_call *)call_user_ID;
290
291 afs_set_call_state(call, AFS_CALL_CL_REQUESTING, AFS_CALL_CL_AWAIT_REPLY);
292}
293
294/*
295 * Initiate a call and synchronously queue up the parameters for dispatch. Any
296 * error is stored into the call struct, which the caller must check for.
297 */
298void afs_make_call(struct afs_call *call, gfp_t gfp)
299{
300 struct rxrpc_call *rxcall;
301 struct msghdr msg;
302 struct kvec iov[1];
303 size_t len;
304 s64 tx_total_len;
305 int ret;
306
307 _enter(",{%pISp+%u},", rxrpc_kernel_remote_addr(call->peer), call->service_id);
308
309 ASSERT(call->type != NULL);
310 ASSERT(call->type->name != NULL);
311
312 _debug("____MAKE %p{%s,%x} [%d]____",
313 call, call->type->name, key_serial(call->key),
314 atomic_read(&call->net->nr_outstanding_calls));
315
316 trace_afs_make_call(call);
317
318 /* Work out the length we're going to transmit. This is awkward for
319 * calls such as FS.StoreData where there's an extra injection of data
320 * after the initial fixed part.
321 */
322 tx_total_len = call->request_size;
323 if (call->write_iter)
324 tx_total_len += iov_iter_count(call->write_iter);
325
326 /* If the call is going to be asynchronous, we need an extra ref for
327 * the call to hold itself so the caller need not hang on to its ref.
328 */
329 if (call->async) {
330 afs_get_call(call, afs_call_trace_get);
331 call->drop_ref = true;
332 }
333
334 /* create a call */
335 rxcall = rxrpc_kernel_begin_call(call->net->socket, call->peer, call->key,
336 (unsigned long)call,
337 tx_total_len,
338 call->max_lifespan,
339 gfp,
340 (call->async ?
341 afs_wake_up_async_call :
342 afs_wake_up_call_waiter),
343 call->service_id,
344 call->upgrade,
345 (call->intr ? RXRPC_PREINTERRUPTIBLE :
346 RXRPC_UNINTERRUPTIBLE),
347 call->debug_id);
348 if (IS_ERR(rxcall)) {
349 ret = PTR_ERR(rxcall);
350 call->error = ret;
351 goto error_kill_call;
352 }
353
354 call->rxcall = rxcall;
355 call->issue_time = ktime_get_real();
356
357 /* send the request */
358 iov[0].iov_base = call->request;
359 iov[0].iov_len = call->request_size;
360
361 msg.msg_name = NULL;
362 msg.msg_namelen = 0;
363 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, call->request_size);
364 msg.msg_control = NULL;
365 msg.msg_controllen = 0;
366 msg.msg_flags = MSG_WAITALL | (call->write_iter ? MSG_MORE : 0);
367
368 ret = rxrpc_kernel_send_data(call->net->socket, rxcall,
369 &msg, call->request_size,
370 afs_notify_end_request_tx);
371 if (ret < 0)
372 goto error_do_abort;
373
374 if (call->write_iter) {
375 msg.msg_iter = *call->write_iter;
376 msg.msg_flags &= ~MSG_MORE;
377 trace_afs_send_data(call, &msg);
378
379 ret = rxrpc_kernel_send_data(call->net->socket,
380 call->rxcall, &msg,
381 iov_iter_count(&msg.msg_iter),
382 afs_notify_end_request_tx);
383 *call->write_iter = msg.msg_iter;
384
385 trace_afs_sent_data(call, &msg, ret);
386 if (ret < 0)
387 goto error_do_abort;
388 }
389
390 /* Note that at this point, we may have received the reply or an abort
391 * - and an asynchronous call may already have completed.
392 *
393 * afs_wait_for_call_to_complete(call)
394 * must be called to synchronously clean up.
395 */
396 return;
397
398error_do_abort:
399 if (ret != -ECONNABORTED) {
400 rxrpc_kernel_abort_call(call->net->socket, rxcall,
401 RX_USER_ABORT, ret,
402 afs_abort_send_data_error);
403 } else {
404 len = 0;
405 iov_iter_kvec(&msg.msg_iter, ITER_DEST, NULL, 0, 0);
406 rxrpc_kernel_recv_data(call->net->socket, rxcall,
407 &msg.msg_iter, &len, false,
408 &call->abort_code, &call->service_id);
409 call->responded = true;
410 }
411 call->error = ret;
412 trace_afs_call_done(call);
413error_kill_call:
414 if (call->type->done)
415 call->type->done(call);
416
417 /* We need to dispose of the extra ref we grabbed for an async call.
418 * The call, however, might be queued on afs_async_calls and we need to
419 * make sure we don't get any more notifications that might requeue it.
420 */
421 if (call->rxcall)
422 rxrpc_kernel_shutdown_call(call->net->socket, call->rxcall);
423 if (call->async) {
424 if (cancel_work_sync(&call->async_work))
425 afs_put_call(call);
426 afs_set_call_complete(call, ret, 0);
427 }
428
429 call->error = ret;
430 call->state = AFS_CALL_COMPLETE;
431 _leave(" = %d", ret);
432}
433
434/*
435 * Log remote abort codes that indicate that we have a protocol disagreement
436 * with the server.
437 */
438static void afs_log_error(struct afs_call *call, s32 remote_abort)
439{
440 static int max = 0;
441 const char *msg;
442 int m;
443
444 switch (remote_abort) {
445 case RX_EOF: msg = "unexpected EOF"; break;
446 case RXGEN_CC_MARSHAL: msg = "client marshalling"; break;
447 case RXGEN_CC_UNMARSHAL: msg = "client unmarshalling"; break;
448 case RXGEN_SS_MARSHAL: msg = "server marshalling"; break;
449 case RXGEN_SS_UNMARSHAL: msg = "server unmarshalling"; break;
450 case RXGEN_DECODE: msg = "opcode decode"; break;
451 case RXGEN_SS_XDRFREE: msg = "server XDR cleanup"; break;
452 case RXGEN_CC_XDRFREE: msg = "client XDR cleanup"; break;
453 case -32: msg = "insufficient data"; break;
454 default:
455 return;
456 }
457
458 m = max;
459 if (m < 3) {
460 max = m + 1;
461 pr_notice("kAFS: Peer reported %s failure on %s [%pISp]\n",
462 msg, call->type->name,
463 rxrpc_kernel_remote_addr(call->peer));
464 }
465}
466
467/*
468 * deliver messages to a call
469 */
470static void afs_deliver_to_call(struct afs_call *call)
471{
472 enum afs_call_state state;
473 size_t len;
474 u32 abort_code, remote_abort = 0;
475 int ret;
476
477 _enter("%s", call->type->name);
478
479 while (state = READ_ONCE(call->state),
480 state == AFS_CALL_CL_AWAIT_REPLY ||
481 state == AFS_CALL_SV_AWAIT_OP_ID ||
482 state == AFS_CALL_SV_AWAIT_REQUEST ||
483 state == AFS_CALL_SV_AWAIT_ACK
484 ) {
485 if (state == AFS_CALL_SV_AWAIT_ACK) {
486 len = 0;
487 iov_iter_kvec(&call->def_iter, ITER_DEST, NULL, 0, 0);
488 ret = rxrpc_kernel_recv_data(call->net->socket,
489 call->rxcall, &call->def_iter,
490 &len, false, &remote_abort,
491 &call->service_id);
492 trace_afs_receive_data(call, &call->def_iter, false, ret);
493
494 if (ret == -EINPROGRESS || ret == -EAGAIN)
495 return;
496 if (ret < 0 || ret == 1) {
497 if (ret == 1)
498 ret = 0;
499 goto call_complete;
500 }
501 return;
502 }
503
504 ret = call->type->deliver(call);
505 state = READ_ONCE(call->state);
506 if (ret == 0 && call->unmarshalling_error)
507 ret = -EBADMSG;
508 switch (ret) {
509 case 0:
510 call->responded = true;
511 afs_queue_call_work(call);
512 if (state == AFS_CALL_CL_PROC_REPLY) {
513 if (call->op)
514 set_bit(AFS_SERVER_FL_MAY_HAVE_CB,
515 &call->op->server->flags);
516 goto call_complete;
517 }
518 ASSERTCMP(state, >, AFS_CALL_CL_PROC_REPLY);
519 goto done;
520 case -EINPROGRESS:
521 case -EAGAIN:
522 goto out;
523 case -ECONNABORTED:
524 ASSERTCMP(state, ==, AFS_CALL_COMPLETE);
525 call->responded = true;
526 afs_log_error(call, call->abort_code);
527 goto done;
528 case -ENOTSUPP:
529 call->responded = true;
530 abort_code = RXGEN_OPCODE;
531 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
532 abort_code, ret,
533 afs_abort_op_not_supported);
534 goto local_abort;
535 case -EIO:
536 pr_err("kAFS: Call %u in bad state %u\n",
537 call->debug_id, state);
538 fallthrough;
539 case -ENODATA:
540 case -EBADMSG:
541 case -EMSGSIZE:
542 case -ENOMEM:
543 case -EFAULT:
544 abort_code = RXGEN_CC_UNMARSHAL;
545 if (state != AFS_CALL_CL_AWAIT_REPLY)
546 abort_code = RXGEN_SS_UNMARSHAL;
547 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
548 abort_code, ret,
549 afs_abort_unmarshal_error);
550 goto local_abort;
551 default:
552 abort_code = RX_CALL_DEAD;
553 rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
554 abort_code, ret,
555 afs_abort_general_error);
556 goto local_abort;
557 }
558 }
559
560done:
561 if (call->type->done)
562 call->type->done(call);
563out:
564 _leave("");
565 return;
566
567local_abort:
568 abort_code = 0;
569call_complete:
570 afs_set_call_complete(call, ret, remote_abort);
571 state = AFS_CALL_COMPLETE;
572 goto done;
573}
574
575/*
576 * Wait synchronously for a call to complete.
577 */
578void afs_wait_for_call_to_complete(struct afs_call *call)
579{
580 bool rxrpc_complete = false;
581
582 _enter("");
583
584 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
585 DECLARE_WAITQUEUE(myself, current);
586
587 add_wait_queue(&call->waitq, &myself);
588 for (;;) {
589 set_current_state(TASK_UNINTERRUPTIBLE);
590
591 /* deliver any messages that are in the queue */
592 if (!afs_check_call_state(call, AFS_CALL_COMPLETE) &&
593 call->need_attention) {
594 call->need_attention = false;
595 __set_current_state(TASK_RUNNING);
596 afs_deliver_to_call(call);
597 continue;
598 }
599
600 if (afs_check_call_state(call, AFS_CALL_COMPLETE))
601 break;
602
603 if (!rxrpc_kernel_check_life(call->net->socket, call->rxcall)) {
604 /* rxrpc terminated the call. */
605 rxrpc_complete = true;
606 break;
607 }
608
609 schedule();
610 }
611
612 remove_wait_queue(&call->waitq, &myself);
613 __set_current_state(TASK_RUNNING);
614 }
615
616 if (!afs_check_call_state(call, AFS_CALL_COMPLETE)) {
617 if (rxrpc_complete) {
618 afs_set_call_complete(call, call->error, call->abort_code);
619 } else {
620 /* Kill off the call if it's still live. */
621 _debug("call interrupted");
622 if (rxrpc_kernel_abort_call(call->net->socket, call->rxcall,
623 RX_USER_ABORT, -EINTR,
624 afs_abort_interrupted))
625 afs_set_call_complete(call, -EINTR, 0);
626 }
627 }
628}
629
630/*
631 * wake up a waiting call
632 */
633static void afs_wake_up_call_waiter(struct sock *sk, struct rxrpc_call *rxcall,
634 unsigned long call_user_ID)
635{
636 struct afs_call *call = (struct afs_call *)call_user_ID;
637
638 call->need_attention = true;
639 wake_up(&call->waitq);
640}
641
642/*
643 * wake up an asynchronous call
644 */
645static void afs_wake_up_async_call(struct sock *sk, struct rxrpc_call *rxcall,
646 unsigned long call_user_ID)
647{
648 struct afs_call *call = (struct afs_call *)call_user_ID;
649 int r;
650
651 trace_afs_notify_call(rxcall, call);
652 call->need_attention = true;
653
654 if (__refcount_inc_not_zero(&call->ref, &r)) {
655 trace_afs_call(call->debug_id, afs_call_trace_wake, r + 1,
656 atomic_read(&call->net->nr_outstanding_calls),
657 __builtin_return_address(0));
658
659 if (!queue_work(afs_async_calls, &call->async_work))
660 afs_put_call(call);
661 }
662}
663
664/*
665 * Perform I/O processing on an asynchronous call. The work item carries a ref
666 * to the call struct that we either need to release or to pass on.
667 */
668static void afs_process_async_call(struct work_struct *work)
669{
670 struct afs_call *call = container_of(work, struct afs_call, async_work);
671
672 _enter("");
673
674 if (call->state < AFS_CALL_COMPLETE && call->need_attention) {
675 call->need_attention = false;
676 afs_deliver_to_call(call);
677 }
678
679 afs_put_call(call);
680 _leave("");
681}
682
683static void afs_rx_attach(struct rxrpc_call *rxcall, unsigned long user_call_ID)
684{
685 struct afs_call *call = (struct afs_call *)user_call_ID;
686
687 call->rxcall = rxcall;
688}
689
690/*
691 * Charge the incoming call preallocation.
692 */
693void afs_charge_preallocation(struct work_struct *work)
694{
695 struct afs_net *net =
696 container_of(work, struct afs_net, charge_preallocation_work);
697 struct afs_call *call = net->spare_incoming_call;
698
699 for (;;) {
700 if (!call) {
701 call = afs_alloc_call(net, &afs_RXCMxxxx, GFP_KERNEL);
702 if (!call)
703 break;
704
705 call->drop_ref = true;
706 call->async = true;
707 call->state = AFS_CALL_SV_AWAIT_OP_ID;
708 init_waitqueue_head(&call->waitq);
709 afs_extract_to_tmp(call);
710 }
711
712 if (rxrpc_kernel_charge_accept(net->socket,
713 afs_wake_up_async_call,
714 afs_rx_attach,
715 (unsigned long)call,
716 GFP_KERNEL,
717 call->debug_id) < 0)
718 break;
719 call = NULL;
720 }
721 net->spare_incoming_call = call;
722}
723
724/*
725 * Discard a preallocated call when a socket is shut down.
726 */
727static void afs_rx_discard_new_call(struct rxrpc_call *rxcall,
728 unsigned long user_call_ID)
729{
730 struct afs_call *call = (struct afs_call *)user_call_ID;
731
732 call->rxcall = NULL;
733 afs_put_call(call);
734}
735
736/*
737 * Notification of an incoming call.
738 */
739static void afs_rx_new_call(struct sock *sk, struct rxrpc_call *rxcall,
740 unsigned long user_call_ID)
741{
742 struct afs_net *net = afs_sock2net(sk);
743
744 queue_work(afs_wq, &net->charge_preallocation_work);
745}
746
747/*
748 * Grab the operation ID from an incoming cache manager call. The socket
749 * buffer is discarded on error or if we don't yet have sufficient data.
750 */
751static int afs_deliver_cm_op_id(struct afs_call *call)
752{
753 int ret;
754
755 _enter("{%zu}", iov_iter_count(call->iter));
756
757 /* the operation ID forms the first four bytes of the request data */
758 ret = afs_extract_data(call, true);
759 if (ret < 0)
760 return ret;
761
762 call->operation_ID = ntohl(call->tmp);
763 afs_set_call_state(call, AFS_CALL_SV_AWAIT_OP_ID, AFS_CALL_SV_AWAIT_REQUEST);
764
765 /* ask the cache manager to route the call (it'll change the call type
766 * if successful) */
767 if (!afs_cm_incoming_call(call))
768 return -ENOTSUPP;
769
770 trace_afs_cb_call(call);
771
772 /* pass responsibility for the remainer of this message off to the
773 * cache manager op */
774 return call->type->deliver(call);
775}
776
777/*
778 * Advance the AFS call state when an RxRPC service call ends the transmit
779 * phase.
780 */
781static void afs_notify_end_reply_tx(struct sock *sock,
782 struct rxrpc_call *rxcall,
783 unsigned long call_user_ID)
784{
785 struct afs_call *call = (struct afs_call *)call_user_ID;
786
787 afs_set_call_state(call, AFS_CALL_SV_REPLYING, AFS_CALL_SV_AWAIT_ACK);
788}
789
790/*
791 * send an empty reply
792 */
793void afs_send_empty_reply(struct afs_call *call)
794{
795 struct afs_net *net = call->net;
796 struct msghdr msg;
797
798 _enter("");
799
800 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, 0);
801
802 msg.msg_name = NULL;
803 msg.msg_namelen = 0;
804 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, NULL, 0, 0);
805 msg.msg_control = NULL;
806 msg.msg_controllen = 0;
807 msg.msg_flags = 0;
808
809 switch (rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, 0,
810 afs_notify_end_reply_tx)) {
811 case 0:
812 _leave(" [replied]");
813 return;
814
815 case -ENOMEM:
816 _debug("oom");
817 rxrpc_kernel_abort_call(net->socket, call->rxcall,
818 RXGEN_SS_MARSHAL, -ENOMEM,
819 afs_abort_oom);
820 fallthrough;
821 default:
822 _leave(" [error]");
823 return;
824 }
825}
826
827/*
828 * send a simple reply
829 */
830void afs_send_simple_reply(struct afs_call *call, const void *buf, size_t len)
831{
832 struct afs_net *net = call->net;
833 struct msghdr msg;
834 struct kvec iov[1];
835 int n;
836
837 _enter("");
838
839 rxrpc_kernel_set_tx_length(net->socket, call->rxcall, len);
840
841 iov[0].iov_base = (void *) buf;
842 iov[0].iov_len = len;
843 msg.msg_name = NULL;
844 msg.msg_namelen = 0;
845 iov_iter_kvec(&msg.msg_iter, ITER_SOURCE, iov, 1, len);
846 msg.msg_control = NULL;
847 msg.msg_controllen = 0;
848 msg.msg_flags = 0;
849
850 n = rxrpc_kernel_send_data(net->socket, call->rxcall, &msg, len,
851 afs_notify_end_reply_tx);
852 if (n >= 0) {
853 /* Success */
854 _leave(" [replied]");
855 return;
856 }
857
858 if (n == -ENOMEM) {
859 _debug("oom");
860 rxrpc_kernel_abort_call(net->socket, call->rxcall,
861 RXGEN_SS_MARSHAL, -ENOMEM,
862 afs_abort_oom);
863 }
864 _leave(" [error]");
865}
866
867/*
868 * Extract a piece of data from the received data socket buffers.
869 */
870int afs_extract_data(struct afs_call *call, bool want_more)
871{
872 struct afs_net *net = call->net;
873 struct iov_iter *iter = call->iter;
874 enum afs_call_state state;
875 u32 remote_abort = 0;
876 int ret;
877
878 _enter("{%s,%zu,%zu},%d",
879 call->type->name, call->iov_len, iov_iter_count(iter), want_more);
880
881 ret = rxrpc_kernel_recv_data(net->socket, call->rxcall, iter,
882 &call->iov_len, want_more, &remote_abort,
883 &call->service_id);
884 trace_afs_receive_data(call, call->iter, want_more, ret);
885 if (ret == 0 || ret == -EAGAIN)
886 return ret;
887
888 state = READ_ONCE(call->state);
889 if (ret == 1) {
890 switch (state) {
891 case AFS_CALL_CL_AWAIT_REPLY:
892 afs_set_call_state(call, state, AFS_CALL_CL_PROC_REPLY);
893 break;
894 case AFS_CALL_SV_AWAIT_REQUEST:
895 afs_set_call_state(call, state, AFS_CALL_SV_REPLYING);
896 break;
897 case AFS_CALL_COMPLETE:
898 kdebug("prem complete %d", call->error);
899 return afs_io_error(call, afs_io_error_extract);
900 default:
901 break;
902 }
903 return 0;
904 }
905
906 afs_set_call_complete(call, ret, remote_abort);
907 return ret;
908}
909
910/*
911 * Log protocol error production.
912 */
913noinline int afs_protocol_error(struct afs_call *call,
914 enum afs_eproto_cause cause)
915{
916 trace_afs_protocol_error(call, cause);
917 if (call)
918 call->unmarshalling_error = true;
919 return -EBADMSG;
920}