1 /* RxRPC individual remote procedure call handling
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <linux/slab.h>
15 #include <linux/module.h>
16 #include <linux/circ_buf.h>
17 #include <linux/spinlock_types.h>
18 #include <net/sock.h>
19 #include <net/af_rxrpc.h>
20 #include "ar-internal.h"
21
22 const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = {
23 [RXRPC_CALL_UNINITIALISED] = "Uninit ",
24 [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn",
25 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
26 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
27 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
28 [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc",
29 [RXRPC_CALL_SERVER_SECURING] = "SvSecure",
30 [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
31 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
32 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
33 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
34 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
35 [RXRPC_CALL_COMPLETE] = "Complete",
36 };
37
38 const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = {
39 [RXRPC_CALL_SUCCEEDED] = "Complete",
40 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
41 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
42 [RXRPC_CALL_LOCAL_ERROR] = "LocError",
43 [RXRPC_CALL_NETWORK_ERROR] = "NetError",
44 };
45
46 struct kmem_cache *rxrpc_call_jar;
47
rxrpc_call_timer_expired(struct timer_list * t)48 static void rxrpc_call_timer_expired(struct timer_list *t)
49 {
50 struct rxrpc_call *call = from_timer(call, t, timer);
51
52 _enter("%d", call->debug_id);
53
54 if (call->state < RXRPC_CALL_COMPLETE) {
55 trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies);
56 rxrpc_queue_call(call);
57 }
58 }
59
60 static struct lock_class_key rxrpc_call_user_mutex_lock_class_key;
61
62 /*
63 * find an extant server call
64 * - called in process context with IRQs enabled
65 */
rxrpc_find_call_by_user_ID(struct rxrpc_sock * rx,unsigned long user_call_ID)66 struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx,
67 unsigned long user_call_ID)
68 {
69 struct rxrpc_call *call;
70 struct rb_node *p;
71
72 _enter("%p,%lx", rx, user_call_ID);
73
74 read_lock(&rx->call_lock);
75
76 p = rx->calls.rb_node;
77 while (p) {
78 call = rb_entry(p, struct rxrpc_call, sock_node);
79
80 if (user_call_ID < call->user_call_ID)
81 p = p->rb_left;
82 else if (user_call_ID > call->user_call_ID)
83 p = p->rb_right;
84 else
85 goto found_extant_call;
86 }
87
88 read_unlock(&rx->call_lock);
89 _leave(" = NULL");
90 return NULL;
91
92 found_extant_call:
93 rxrpc_get_call(call, rxrpc_call_got);
94 read_unlock(&rx->call_lock);
95 _leave(" = %p [%d]", call, atomic_read(&call->usage));
96 return call;
97 }
98
99 /*
100 * allocate a new call
101 */
rxrpc_alloc_call(struct rxrpc_sock * rx,gfp_t gfp,unsigned int debug_id)102 struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
103 unsigned int debug_id)
104 {
105 struct rxrpc_call *call;
106 struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk));
107
108 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
109 if (!call)
110 return NULL;
111
112 call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE,
113 sizeof(struct sk_buff *),
114 gfp);
115 if (!call->rxtx_buffer)
116 goto nomem;
117
118 call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp);
119 if (!call->rxtx_annotations)
120 goto nomem_2;
121
122 mutex_init(&call->user_mutex);
123
124 /* Prevent lockdep reporting a deadlock false positive between the afs
125 * filesystem and sys_sendmsg() via the mmap sem.
126 */
127 if (rx->sk.sk_kern_sock)
128 lockdep_set_class(&call->user_mutex,
129 &rxrpc_call_user_mutex_lock_class_key);
130
131 timer_setup(&call->timer, rxrpc_call_timer_expired, 0);
132 INIT_WORK(&call->processor, &rxrpc_process_call);
133 INIT_LIST_HEAD(&call->link);
134 INIT_LIST_HEAD(&call->chan_wait_link);
135 INIT_LIST_HEAD(&call->accept_link);
136 INIT_LIST_HEAD(&call->recvmsg_link);
137 INIT_LIST_HEAD(&call->sock_link);
138 init_waitqueue_head(&call->waitq);
139 spin_lock_init(&call->lock);
140 spin_lock_init(&call->notify_lock);
141 spin_lock_init(&call->input_lock);
142 rwlock_init(&call->state_lock);
143 atomic_set(&call->usage, 1);
144 call->debug_id = debug_id;
145 call->tx_total_len = -1;
146 call->next_rx_timo = 20 * HZ;
147 call->next_req_timo = 1 * HZ;
148
149 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
150
151 /* Leave space in the ring to handle a maxed-out jumbo packet */
152 call->rx_winsize = rxrpc_rx_window_size;
153 call->tx_winsize = 16;
154 call->rx_expect_next = 1;
155
156 call->cong_cwnd = 2;
157 call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1;
158
159 call->rxnet = rxnet;
160 atomic_inc(&rxnet->nr_calls);
161 return call;
162
163 nomem_2:
164 kfree(call->rxtx_buffer);
165 nomem:
166 kmem_cache_free(rxrpc_call_jar, call);
167 return NULL;
168 }
169
170 /*
171 * Allocate a new client call.
172 */
rxrpc_alloc_client_call(struct rxrpc_sock * rx,struct sockaddr_rxrpc * srx,gfp_t gfp,unsigned int debug_id)173 static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx,
174 struct sockaddr_rxrpc *srx,
175 gfp_t gfp,
176 unsigned int debug_id)
177 {
178 struct rxrpc_call *call;
179 ktime_t now;
180
181 _enter("");
182
183 call = rxrpc_alloc_call(rx, gfp, debug_id);
184 if (!call)
185 return ERR_PTR(-ENOMEM);
186 call->state = RXRPC_CALL_CLIENT_AWAIT_CONN;
187 call->service_id = srx->srx_service;
188 call->tx_phase = true;
189 now = ktime_get_real();
190 call->acks_latest_ts = now;
191 call->cong_tstamp = now;
192
193 _leave(" = %p", call);
194 return call;
195 }
196
197 /*
198 * Initiate the call ack/resend/expiry timer.
199 */
rxrpc_start_call_timer(struct rxrpc_call * call)200 static void rxrpc_start_call_timer(struct rxrpc_call *call)
201 {
202 unsigned long now = jiffies;
203 unsigned long j = now + MAX_JIFFY_OFFSET;
204
205 call->ack_at = j;
206 call->ack_lost_at = j;
207 call->resend_at = j;
208 call->ping_at = j;
209 call->expect_rx_by = j;
210 call->expect_req_by = j;
211 call->expect_term_by = j;
212 call->timer.expires = now;
213 }
214
215 /*
216 * Set up a call for the given parameters.
217 * - Called with the socket lock held, which it must release.
218 * - If it returns a call, the call's lock will need releasing by the caller.
219 */
rxrpc_new_client_call(struct rxrpc_sock * rx,struct rxrpc_conn_parameters * cp,struct sockaddr_rxrpc * srx,struct rxrpc_call_params * p,gfp_t gfp,unsigned int debug_id)220 struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx,
221 struct rxrpc_conn_parameters *cp,
222 struct sockaddr_rxrpc *srx,
223 struct rxrpc_call_params *p,
224 gfp_t gfp,
225 unsigned int debug_id)
226 __releases(&rx->sk.sk_lock.slock)
227 __acquires(&call->user_mutex)
228 {
229 struct rxrpc_call *call, *xcall;
230 struct rxrpc_net *rxnet;
231 struct rb_node *parent, **pp;
232 const void *here = __builtin_return_address(0);
233 int ret;
234
235 _enter("%p,%lx", rx, p->user_call_ID);
236
237 call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id);
238 if (IS_ERR(call)) {
239 release_sock(&rx->sk);
240 _leave(" = %ld", PTR_ERR(call));
241 return call;
242 }
243
244 call->tx_total_len = p->tx_total_len;
245 trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage),
246 here, (const void *)p->user_call_ID);
247
248 /* We need to protect a partially set up call against the user as we
249 * will be acting outside the socket lock.
250 */
251 mutex_lock(&call->user_mutex);
252
253 /* Publish the call, even though it is incompletely set up as yet */
254 write_lock(&rx->call_lock);
255
256 pp = &rx->calls.rb_node;
257 parent = NULL;
258 while (*pp) {
259 parent = *pp;
260 xcall = rb_entry(parent, struct rxrpc_call, sock_node);
261
262 if (p->user_call_ID < xcall->user_call_ID)
263 pp = &(*pp)->rb_left;
264 else if (p->user_call_ID > xcall->user_call_ID)
265 pp = &(*pp)->rb_right;
266 else
267 goto error_dup_user_ID;
268 }
269
270 rcu_assign_pointer(call->socket, rx);
271 call->user_call_ID = p->user_call_ID;
272 __set_bit(RXRPC_CALL_HAS_USERID, &call->flags);
273 rxrpc_get_call(call, rxrpc_call_got_userid);
274 rb_link_node(&call->sock_node, parent, pp);
275 rb_insert_color(&call->sock_node, &rx->calls);
276 list_add(&call->sock_link, &rx->sock_calls);
277
278 write_unlock(&rx->call_lock);
279
280 rxnet = call->rxnet;
281 write_lock(&rxnet->call_lock);
282 list_add_tail(&call->link, &rxnet->calls);
283 write_unlock(&rxnet->call_lock);
284
285 /* From this point on, the call is protected by its own lock. */
286 release_sock(&rx->sk);
287
288 /* Set up or get a connection record and set the protocol parameters,
289 * including channel number and call ID.
290 */
291 ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
292 if (ret < 0)
293 goto error;
294
295 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
296 here, NULL);
297
298 rxrpc_start_call_timer(call);
299
300 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
301
302 _leave(" = %p [new]", call);
303 return call;
304
305 /* We unexpectedly found the user ID in the list after taking
306 * the call_lock. This shouldn't happen unless the user races
307 * with itself and tries to add the same user ID twice at the
308 * same time in different threads.
309 */
310 error_dup_user_ID:
311 write_unlock(&rx->call_lock);
312 release_sock(&rx->sk);
313 ret = -EEXIST;
314
315 error:
316 __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
317 RX_CALL_DEAD, ret);
318 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
319 here, ERR_PTR(ret));
320 rxrpc_release_call(rx, call);
321 mutex_unlock(&call->user_mutex);
322 rxrpc_put_call(call, rxrpc_call_put);
323 _leave(" = %d", ret);
324 return ERR_PTR(ret);
325 }
326
327 /*
328 * Retry a call to a new address. It is expected that the Tx queue of the call
329 * will contain data previously packaged for an old call.
330 */
rxrpc_retry_client_call(struct rxrpc_sock * rx,struct rxrpc_call * call,struct rxrpc_conn_parameters * cp,struct sockaddr_rxrpc * srx,gfp_t gfp)331 int rxrpc_retry_client_call(struct rxrpc_sock *rx,
332 struct rxrpc_call *call,
333 struct rxrpc_conn_parameters *cp,
334 struct sockaddr_rxrpc *srx,
335 gfp_t gfp)
336 {
337 const void *here = __builtin_return_address(0);
338 int ret;
339
340 /* Set up or get a connection record and set the protocol parameters,
341 * including channel number and call ID.
342 */
343 ret = rxrpc_connect_call(rx, call, cp, srx, gfp);
344 if (ret < 0)
345 goto error;
346
347 trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage),
348 here, NULL);
349
350 rxrpc_start_call_timer(call);
351
352 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
353
354 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
355 rxrpc_queue_call(call);
356
357 _leave(" = 0");
358 return 0;
359
360 error:
361 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
362 RX_CALL_DEAD, ret);
363 trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage),
364 here, ERR_PTR(ret));
365 _leave(" = %d", ret);
366 return ret;
367 }
368
369 /*
370 * Set up an incoming call. call->conn points to the connection.
371 * This is called in BH context and isn't allowed to fail.
372 */
rxrpc_incoming_call(struct rxrpc_sock * rx,struct rxrpc_call * call,struct sk_buff * skb)373 void rxrpc_incoming_call(struct rxrpc_sock *rx,
374 struct rxrpc_call *call,
375 struct sk_buff *skb)
376 {
377 struct rxrpc_connection *conn = call->conn;
378 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
379 u32 chan;
380
381 _enter(",%d", call->conn->debug_id);
382
383 rcu_assign_pointer(call->socket, rx);
384 call->call_id = sp->hdr.callNumber;
385 call->service_id = sp->hdr.serviceId;
386 call->cid = sp->hdr.cid;
387 call->state = RXRPC_CALL_SERVER_ACCEPTING;
388 if (sp->hdr.securityIndex > 0)
389 call->state = RXRPC_CALL_SERVER_SECURING;
390 call->cong_tstamp = skb->tstamp;
391
392 /* Set the channel for this call. We don't get channel_lock as we're
393 * only defending against the data_ready handler (which we're called
394 * from) and the RESPONSE packet parser (which is only really
395 * interested in call_counter and can cope with a disagreement with the
396 * call pointer).
397 */
398 chan = sp->hdr.cid & RXRPC_CHANNELMASK;
399 conn->channels[chan].call_counter = call->call_id;
400 conn->channels[chan].call_id = call->call_id;
401 rcu_assign_pointer(conn->channels[chan].call, call);
402
403 spin_lock(&conn->params.peer->lock);
404 hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets);
405 spin_unlock(&conn->params.peer->lock);
406
407 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
408
409 rxrpc_start_call_timer(call);
410 _leave("");
411 }
412
413 /*
414 * Queue a call's work processor, getting a ref to pass to the work queue.
415 */
rxrpc_queue_call(struct rxrpc_call * call)416 bool rxrpc_queue_call(struct rxrpc_call *call)
417 {
418 const void *here = __builtin_return_address(0);
419 int n = atomic_fetch_add_unless(&call->usage, 1, 0);
420 if (n == 0)
421 return false;
422 if (rxrpc_queue_work(&call->processor))
423 trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL);
424 else
425 rxrpc_put_call(call, rxrpc_call_put_noqueue);
426 return true;
427 }
428
429 /*
430 * Queue a call's work processor, passing the callers ref to the work queue.
431 */
__rxrpc_queue_call(struct rxrpc_call * call)432 bool __rxrpc_queue_call(struct rxrpc_call *call)
433 {
434 const void *here = __builtin_return_address(0);
435 int n = atomic_read(&call->usage);
436 ASSERTCMP(n, >=, 1);
437 if (rxrpc_queue_work(&call->processor))
438 trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL);
439 else
440 rxrpc_put_call(call, rxrpc_call_put_noqueue);
441 return true;
442 }
443
444 /*
445 * Note the re-emergence of a call.
446 */
rxrpc_see_call(struct rxrpc_call * call)447 void rxrpc_see_call(struct rxrpc_call *call)
448 {
449 const void *here = __builtin_return_address(0);
450 if (call) {
451 int n = atomic_read(&call->usage);
452
453 trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL);
454 }
455 }
456
457 /*
458 * Note the addition of a ref on a call.
459 */
rxrpc_get_call(struct rxrpc_call * call,enum rxrpc_call_trace op)460 void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
461 {
462 const void *here = __builtin_return_address(0);
463 int n = atomic_inc_return(&call->usage);
464
465 trace_rxrpc_call(call, op, n, here, NULL);
466 }
467
468 /*
469 * Detach a call from its owning socket.
470 */
rxrpc_release_call(struct rxrpc_sock * rx,struct rxrpc_call * call)471 void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
472 {
473 const void *here = __builtin_return_address(0);
474 struct rxrpc_connection *conn = call->conn;
475 bool put = false;
476 int i;
477
478 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
479
480 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
481 here, (const void *)call->flags);
482
483 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
484
485 spin_lock_bh(&call->lock);
486 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
487 BUG();
488 spin_unlock_bh(&call->lock);
489
490 del_timer_sync(&call->timer);
491
492 /* Make sure we don't get any more notifications */
493 write_lock_bh(&rx->recvmsg_lock);
494
495 if (!list_empty(&call->recvmsg_link)) {
496 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
497 call, call->events, call->flags);
498 list_del(&call->recvmsg_link);
499 put = true;
500 }
501
502 /* list_empty() must return false in rxrpc_notify_socket() */
503 call->recvmsg_link.next = NULL;
504 call->recvmsg_link.prev = NULL;
505
506 write_unlock_bh(&rx->recvmsg_lock);
507 if (put)
508 rxrpc_put_call(call, rxrpc_call_put);
509
510 write_lock(&rx->call_lock);
511
512 if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
513 rb_erase(&call->sock_node, &rx->calls);
514 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
515 rxrpc_put_call(call, rxrpc_call_put_userid);
516 }
517
518 list_del(&call->sock_link);
519 write_unlock(&rx->call_lock);
520
521 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
522
523 if (conn)
524 rxrpc_disconnect_call(call);
525
526 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
527 rxrpc_free_skb(call->rxtx_buffer[i],
528 (call->tx_phase ? rxrpc_skb_tx_cleaned :
529 rxrpc_skb_rx_cleaned));
530 call->rxtx_buffer[i] = NULL;
531 }
532
533 _leave("");
534 }
535
536 /*
537 * Prepare a kernel service call for retry.
538 */
rxrpc_prepare_call_for_retry(struct rxrpc_sock * rx,struct rxrpc_call * call)539 int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call)
540 {
541 const void *here = __builtin_return_address(0);
542 int i;
543 u8 last = 0;
544
545 _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage));
546
547 trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage),
548 here, (const void *)call->flags);
549
550 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
551 ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED);
552 ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED);
553 ASSERT(list_empty(&call->recvmsg_link));
554
555 del_timer_sync(&call->timer);
556
557 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn);
558
559 if (call->conn)
560 rxrpc_disconnect_call(call);
561
562 if (rxrpc_is_service_call(call) ||
563 !call->tx_phase ||
564 call->tx_hard_ack != 0 ||
565 call->rx_hard_ack != 0 ||
566 call->rx_top != 0)
567 return -EINVAL;
568
569 call->state = RXRPC_CALL_UNINITIALISED;
570 call->completion = RXRPC_CALL_SUCCEEDED;
571 call->call_id = 0;
572 call->cid = 0;
573 call->cong_cwnd = 0;
574 call->cong_extra = 0;
575 call->cong_ssthresh = 0;
576 call->cong_mode = 0;
577 call->cong_dup_acks = 0;
578 call->cong_cumul_acks = 0;
579 call->acks_lowest_nak = 0;
580
581 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) {
582 last |= call->rxtx_annotations[i];
583 call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST;
584 call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS;
585 }
586
587 _leave(" = 0");
588 return 0;
589 }
590
591 /*
592 * release all the calls associated with a socket
593 */
rxrpc_release_calls_on_socket(struct rxrpc_sock * rx)594 void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
595 {
596 struct rxrpc_call *call;
597
598 _enter("%p", rx);
599
600 while (!list_empty(&rx->to_be_accepted)) {
601 call = list_entry(rx->to_be_accepted.next,
602 struct rxrpc_call, accept_link);
603 list_del(&call->accept_link);
604 rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET);
605 rxrpc_put_call(call, rxrpc_call_put);
606 }
607
608 while (!list_empty(&rx->sock_calls)) {
609 call = list_entry(rx->sock_calls.next,
610 struct rxrpc_call, sock_link);
611 rxrpc_get_call(call, rxrpc_call_got);
612 rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET);
613 rxrpc_send_abort_packet(call);
614 rxrpc_release_call(rx, call);
615 rxrpc_put_call(call, rxrpc_call_put);
616 }
617
618 _leave("");
619 }
620
621 /*
622 * release a call
623 */
rxrpc_put_call(struct rxrpc_call * call,enum rxrpc_call_trace op)624 void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op)
625 {
626 struct rxrpc_net *rxnet = call->rxnet;
627 const void *here = __builtin_return_address(0);
628 int n;
629
630 ASSERT(call != NULL);
631
632 n = atomic_dec_return(&call->usage);
633 trace_rxrpc_call(call, op, n, here, NULL);
634 ASSERTCMP(n, >=, 0);
635 if (n == 0) {
636 _debug("call %d dead", call->debug_id);
637 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
638
639 if (!list_empty(&call->link)) {
640 write_lock(&rxnet->call_lock);
641 list_del_init(&call->link);
642 write_unlock(&rxnet->call_lock);
643 }
644
645 rxrpc_cleanup_call(call);
646 }
647 }
648
649 /*
650 * Final call destruction under RCU.
651 */
rxrpc_rcu_destroy_call(struct rcu_head * rcu)652 static void rxrpc_rcu_destroy_call(struct rcu_head *rcu)
653 {
654 struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu);
655 struct rxrpc_net *rxnet = call->rxnet;
656
657 rxrpc_put_peer(call->peer);
658 kfree(call->rxtx_buffer);
659 kfree(call->rxtx_annotations);
660 kmem_cache_free(rxrpc_call_jar, call);
661 if (atomic_dec_and_test(&rxnet->nr_calls))
662 wake_up_var(&rxnet->nr_calls);
663 }
664
665 /*
666 * clean up a call
667 */
rxrpc_cleanup_call(struct rxrpc_call * call)668 void rxrpc_cleanup_call(struct rxrpc_call *call)
669 {
670 int i;
671
672 _net("DESTROY CALL %d", call->debug_id);
673
674 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
675
676 del_timer_sync(&call->timer);
677
678 ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
679 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
680 ASSERTCMP(call->conn, ==, NULL);
681
682 /* Clean up the Rx/Tx buffer */
683 for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++)
684 rxrpc_free_skb(call->rxtx_buffer[i],
685 (call->tx_phase ? rxrpc_skb_tx_cleaned :
686 rxrpc_skb_rx_cleaned));
687
688 rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned);
689
690 call_rcu(&call->rcu, rxrpc_rcu_destroy_call);
691 }
692
693 /*
694 * Make sure that all calls are gone from a network namespace. To reach this
695 * point, any open UDP sockets in that namespace must have been closed, so any
696 * outstanding calls cannot be doing I/O.
697 */
rxrpc_destroy_all_calls(struct rxrpc_net * rxnet)698 void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet)
699 {
700 struct rxrpc_call *call;
701
702 _enter("");
703
704 if (list_empty(&rxnet->calls))
705 return;
706
707 write_lock(&rxnet->call_lock);
708
709 while (!list_empty(&rxnet->calls)) {
710 call = list_entry(rxnet->calls.next, struct rxrpc_call, link);
711 _debug("Zapping call %p", call);
712
713 rxrpc_see_call(call);
714 list_del_init(&call->link);
715
716 pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n",
717 call, atomic_read(&call->usage),
718 rxrpc_call_states[call->state],
719 call->flags, call->events);
720
721 write_unlock(&rxnet->call_lock);
722 cond_resched();
723 write_lock(&rxnet->call_lock);
724 }
725
726 write_unlock(&rxnet->call_lock);
727
728 atomic_dec(&rxnet->nr_calls);
729 wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls));
730 }
731