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Merge tag 'iwlwifi-for-john-2014-11-03' of git://git.kernel.org/pub/scm/linux/kernel...
[linux.git] / net / rxrpc / ar-call.c
CommitLineData
17926a79
DH		 1/* RxRPC individual remote procedure call handling
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells ([email protected])
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
5a0e3ad6 12#include <linux/slab.h>
17926a79
DH		 13#include <linux/module.h>
14#include <linux/circ_buf.h>
7727640c
TS		 15#include <linux/hashtable.h>
16#include <linux/spinlock_types.h>
17926a79
DH		 17#include <net/sock.h>
18#include <net/af_rxrpc.h>
19#include "ar-internal.h"
20
5873c083
DH		 21/*
22 * Maximum lifetime of a call (in jiffies).
23 */
24unsigned rxrpc_max_call_lifetime = 60 * HZ;
25
26/*
27 * Time till dead call expires after last use (in jiffies).
28 */
29unsigned rxrpc_dead_call_expiry = 2 * HZ;
30
036c2e27 31const char *const rxrpc_call_states[] = {
1f8481d1
DH		 32 [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq",
33 [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl",
34 [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl",
35 [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK",
36 [RXRPC_CALL_SERVER_SECURING] = "SvSecure",
37 [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept",
38 [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq",
39 [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq",
40 [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl",
41 [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK",
42 [RXRPC_CALL_COMPLETE] = "Complete",
43 [RXRPC_CALL_SERVER_BUSY] = "SvBusy ",
44 [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort",
45 [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort",
46 [RXRPC_CALL_NETWORK_ERROR] = "NetError",
47 [RXRPC_CALL_DEAD] = "Dead ",
48};
49
17926a79
DH		 50struct kmem_cache *rxrpc_call_jar;
51LIST_HEAD(rxrpc_calls);
52DEFINE_RWLOCK(rxrpc_call_lock);
17926a79
DH		 53
54static void rxrpc_destroy_call(struct work_struct *work);
55static void rxrpc_call_life_expired(unsigned long _call);
56static void rxrpc_dead_call_expired(unsigned long _call);
57static void rxrpc_ack_time_expired(unsigned long _call);
58static void rxrpc_resend_time_expired(unsigned long _call);
59
7727640c
TS		 60static DEFINE_SPINLOCK(rxrpc_call_hash_lock);
61static DEFINE_HASHTABLE(rxrpc_call_hash, 10);
62
63/*
64 * Hash function for rxrpc_call_hash
65 */
66static unsigned long rxrpc_call_hashfunc(
67 u8 clientflag,
68 __be32 cid,
69 __be32 call_id,
70 __be32 epoch,
71 __be16 service_id,
72 sa_family_t proto,
73 void *localptr,
74 unsigned int addr_size,
75 const u8 *peer_addr)
76{
77 const u16 *p;
78 unsigned int i;
79 unsigned long key;
80 u32 hcid = ntohl(cid);
81
82 _enter("");
83
84 key = (unsigned long)localptr;
85 /* We just want to add up the __be32 values, so forcing the
86 * cast should be okay.
87 */
88 key += (__force u32)epoch;
89 key += (__force u16)service_id;
90 key += (__force u32)call_id;
91 key += (hcid & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT;
92 key += hcid & RXRPC_CHANNELMASK;
93 key += clientflag;
94 key += proto;
95 /* Step through the peer address in 16-bit portions for speed */
96 for (i = 0, p = (const u16 *)peer_addr; i < addr_size >> 1; i++, p++)
97 key += *p;
98 _leave(" key = 0x%lx", key);
99 return key;
100}
101
102/*
103 * Add a call to the hashtable
104 */
105static void rxrpc_call_hash_add(struct rxrpc_call *call)
106{
107 unsigned long key;
108 unsigned int addr_size = 0;
109
110 _enter("");
111 switch (call->proto) {
112 case AF_INET:
113 addr_size = sizeof(call->peer_ip.ipv4_addr);
114 break;
115 case AF_INET6:
116 addr_size = sizeof(call->peer_ip.ipv6_addr);
117 break;
118 default:
119 break;
120 }
121 key = rxrpc_call_hashfunc(call->in_clientflag, call->cid,
122 call->call_id, call->epoch,
123 call->service_id, call->proto,
124 call->conn->trans->local, addr_size,
125 call->peer_ip.ipv6_addr);
126 /* Store the full key in the call */
127 call->hash_key = key;
128 spin_lock(&rxrpc_call_hash_lock);
129 hash_add_rcu(rxrpc_call_hash, &call->hash_node, key);
130 spin_unlock(&rxrpc_call_hash_lock);
131 _leave("");
132}
133
134/*
135 * Remove a call from the hashtable
136 */
137static void rxrpc_call_hash_del(struct rxrpc_call *call)
138{
139 _enter("");
140 spin_lock(&rxrpc_call_hash_lock);
141 hash_del_rcu(&call->hash_node);
142 spin_unlock(&rxrpc_call_hash_lock);
143 _leave("");
144}
145
146/*
147 * Find a call in the hashtable and return it, or NULL if it
148 * isn't there.
149 */
150struct rxrpc_call *rxrpc_find_call_hash(
151 u8 clientflag,
152 __be32 cid,
153 __be32 call_id,
154 __be32 epoch,
155 __be16 service_id,
156 void *localptr,
157 sa_family_t proto,
158 const u8 *peer_addr)
159{
160 unsigned long key;
161 unsigned int addr_size = 0;
162 struct rxrpc_call *call = NULL;
163 struct rxrpc_call *ret = NULL;
164
165 _enter("");
166 switch (proto) {
167 case AF_INET:
168 addr_size = sizeof(call->peer_ip.ipv4_addr);
169 break;
170 case AF_INET6:
171 addr_size = sizeof(call->peer_ip.ipv6_addr);
172 break;
173 default:
174 break;
175 }
176
177 key = rxrpc_call_hashfunc(clientflag, cid, call_id, epoch,
178 service_id, proto, localptr, addr_size,
179 peer_addr);
180 hash_for_each_possible_rcu(rxrpc_call_hash, call, hash_node, key) {
181 if (call->hash_key == key &&
182 call->call_id == call_id &&
183 call->cid == cid &&
184 call->in_clientflag == clientflag &&
185 call->service_id == service_id &&
186 call->proto == proto &&
187 call->local == localptr &&
188 memcmp(call->peer_ip.ipv6_addr, peer_addr,
189 addr_size) == 0 &&
190 call->epoch == epoch) {
191 ret = call;
192 break;
193 }
194 }
195 _leave(" = %p", ret);
196 return ret;
197}
198
17926a79
DH		 199/*
200 * allocate a new call
201 */
202static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp)
203{
204 struct rxrpc_call *call;
205
206 call = kmem_cache_zalloc(rxrpc_call_jar, gfp);
207 if (!call)
208 return NULL;
209
210 call->acks_winsz = 16;
211 call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long),
212 gfp);
213 if (!call->acks_window) {
214 kmem_cache_free(rxrpc_call_jar, call);
215 return NULL;
216 }
217
218 setup_timer(&call->lifetimer, &rxrpc_call_life_expired,
219 (unsigned long) call);
220 setup_timer(&call->deadspan, &rxrpc_dead_call_expired,
221 (unsigned long) call);
222 setup_timer(&call->ack_timer, &rxrpc_ack_time_expired,
223 (unsigned long) call);
224 setup_timer(&call->resend_timer, &rxrpc_resend_time_expired,
225 (unsigned long) call);
226 INIT_WORK(&call->destroyer, &rxrpc_destroy_call);
227 INIT_WORK(&call->processor, &rxrpc_process_call);
228 INIT_LIST_HEAD(&call->accept_link);
229 skb_queue_head_init(&call->rx_queue);
230 skb_queue_head_init(&call->rx_oos_queue);
231 init_waitqueue_head(&call->tx_waitq);
232 spin_lock_init(&call->lock);
233 rwlock_init(&call->state_lock);
234 atomic_set(&call->usage, 1);
235 call->debug_id = atomic_inc_return(&rxrpc_debug_id);
236 call->state = RXRPC_CALL_CLIENT_SEND_REQUEST;
237
238 memset(&call->sock_node, 0xed, sizeof(call->sock_node));
239
240 call->rx_data_expect = 1;
241 call->rx_data_eaten = 0;
242 call->rx_first_oos = 0;
817913d8 243 call->ackr_win_top = call->rx_data_eaten + 1 + rxrpc_rx_window_size;
17926a79
DH		 244 call->creation_jif = jiffies;
245 return call;
246}
247
248/*
fd589a8f 249 * allocate a new client call and attempt to get a connection slot for it
17926a79
DH		 250 */
251static struct rxrpc_call *rxrpc_alloc_client_call(
252 struct rxrpc_sock *rx,
253 struct rxrpc_transport *trans,
254 struct rxrpc_conn_bundle *bundle,
255 gfp_t gfp)
256{
257 struct rxrpc_call *call;
258 int ret;
259
260 _enter("");
261
262 ASSERT(rx != NULL);
263 ASSERT(trans != NULL);
264 ASSERT(bundle != NULL);
265
266 call = rxrpc_alloc_call(gfp);
267 if (!call)
268 return ERR_PTR(-ENOMEM);
269
270 sock_hold(&rx->sk);
271 call->socket = rx;
272 call->rx_data_post = 1;
273
274 ret = rxrpc_connect_call(rx, trans, bundle, call, gfp);
275 if (ret < 0) {
276 kmem_cache_free(rxrpc_call_jar, call);
277 return ERR_PTR(ret);
278 }
279
7727640c
TS		 280 /* Record copies of information for hashtable lookup */
281 call->proto = rx->proto;
282 call->local = trans->local;
283 switch (call->proto) {
284 case AF_INET:
285 call->peer_ip.ipv4_addr =
286 trans->peer->srx.transport.sin.sin_addr.s_addr;
287 break;
288 case AF_INET6:
289 memcpy(call->peer_ip.ipv6_addr,
290 trans->peer->srx.transport.sin6.sin6_addr.in6_u.u6_addr8,
291 sizeof(call->peer_ip.ipv6_addr));
292 break;
293 }
294 call->epoch = call->conn->epoch;
295 call->service_id = call->conn->service_id;
296 call->in_clientflag = call->conn->in_clientflag;
297 /* Add the new call to the hashtable */
298 rxrpc_call_hash_add(call);
299
17926a79
DH		 300 spin_lock(&call->conn->trans->peer->lock);
301 list_add(&call->error_link, &call->conn->trans->peer->error_targets);
302 spin_unlock(&call->conn->trans->peer->lock);
303
5873c083 304 call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime;
17926a79
DH		 305 add_timer(&call->lifetimer);
306
307 _leave(" = %p", call);
308 return call;
309}
310
311/*
312 * set up a call for the given data
313 * - called in process context with IRQs enabled
314 */
315struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx,
316 struct rxrpc_transport *trans,
317 struct rxrpc_conn_bundle *bundle,
318 unsigned long user_call_ID,
319 int create,
320 gfp_t gfp)
321{
322 struct rxrpc_call *call, *candidate;
323 struct rb_node *p, *parent, **pp;
324
325 _enter("%p,%d,%d,%lx,%d",
326 rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1,
327 user_call_ID, create);
328
329 /* search the extant calls first for one that matches the specified
330 * user ID */
331 read_lock(&rx->call_lock);
332
333 p = rx->calls.rb_node;
334 while (p) {
335 call = rb_entry(p, struct rxrpc_call, sock_node);
336
337 if (user_call_ID < call->user_call_ID)
338 p = p->rb_left;
339 else if (user_call_ID > call->user_call_ID)
340 p = p->rb_right;
341 else
342 goto found_extant_call;
343 }
344
345 read_unlock(&rx->call_lock);
346
347 if (!create || !trans)
348 return ERR_PTR(-EBADSLT);
349
350 /* not yet present - create a candidate for a new record and then
351 * redo the search */
352 candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp);
353 if (IS_ERR(candidate)) {
354 _leave(" = %ld", PTR_ERR(candidate));
355 return candidate;
356 }
357
358 candidate->user_call_ID = user_call_ID;
359 __set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags);
360
361 write_lock(&rx->call_lock);
362
363 pp = &rx->calls.rb_node;
364 parent = NULL;
365 while (*pp) {
366 parent = *pp;
367 call = rb_entry(parent, struct rxrpc_call, sock_node);
368
369 if (user_call_ID < call->user_call_ID)
370 pp = &(*pp)->rb_left;
371 else if (user_call_ID > call->user_call_ID)
372 pp = &(*pp)->rb_right;
373 else
374 goto found_extant_second;
375 }
376
377 /* second search also failed; add the new call */
378 call = candidate;
379 candidate = NULL;
380 rxrpc_get_call(call);
381
382 rb_link_node(&call->sock_node, parent, pp);
383 rb_insert_color(&call->sock_node, &rx->calls);
384 write_unlock(&rx->call_lock);
385
386 write_lock_bh(&rxrpc_call_lock);
387 list_add_tail(&call->link, &rxrpc_calls);
388 write_unlock_bh(&rxrpc_call_lock);
389
390 _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id);
391
392 _leave(" = %p [new]", call);
393 return call;
394
395 /* we found the call in the list immediately */
396found_extant_call:
397 rxrpc_get_call(call);
398 read_unlock(&rx->call_lock);
399 _leave(" = %p [extant %d]", call, atomic_read(&call->usage));
400 return call;
401
402 /* we found the call on the second time through the list */
403found_extant_second:
404 rxrpc_get_call(call);
405 write_unlock(&rx->call_lock);
406 rxrpc_put_call(candidate);
407 _leave(" = %p [second %d]", call, atomic_read(&call->usage));
408 return call;
409}
410
411/*
412 * set up an incoming call
413 * - called in process context with IRQs enabled
414 */
415struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
416 struct rxrpc_connection *conn,
417 struct rxrpc_header *hdr,
418 gfp_t gfp)
419{
420 struct rxrpc_call *call, *candidate;
421 struct rb_node **p, *parent;
422 __be32 call_id;
423
424 _enter(",%d,,%x", conn->debug_id, gfp);
425
426 ASSERT(rx != NULL);
427
428 candidate = rxrpc_alloc_call(gfp);
429 if (!candidate)
430 return ERR_PTR(-EBUSY);
431
432 candidate->socket = rx;
433 candidate->conn = conn;
434 candidate->cid = hdr->cid;
435 candidate->call_id = hdr->callNumber;
436 candidate->channel = ntohl(hdr->cid) & RXRPC_CHANNELMASK;
437 candidate->rx_data_post = 0;
438 candidate->state = RXRPC_CALL_SERVER_ACCEPTING;
439 if (conn->security_ix > 0)
440 candidate->state = RXRPC_CALL_SERVER_SECURING;
441
442 write_lock_bh(&conn->lock);
443
444 /* set the channel for this call */
445 call = conn->channels[candidate->channel];
446 _debug("channel[%u] is %p", candidate->channel, call);
447 if (call && call->call_id == hdr->callNumber) {
448 /* already set; must've been a duplicate packet */
449 _debug("extant call [%d]", call->state);
450 ASSERTCMP(call->conn, ==, conn);
451
452 read_lock(&call->state_lock);
453 switch (call->state) {
454 case RXRPC_CALL_LOCALLY_ABORTED:
455 if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
651350d1 456 rxrpc_queue_call(call);
17926a79
DH		 457 case RXRPC_CALL_REMOTELY_ABORTED:
458 read_unlock(&call->state_lock);
459 goto aborted_call;
460 default:
461 rxrpc_get_call(call);
462 read_unlock(&call->state_lock);
463 goto extant_call;
464 }
465 }
466
467 if (call) {
468 /* it seems the channel is still in use from the previous call
469 * - ditch the old binding if its call is now complete */
470 _debug("CALL: %u { %s }",
471 call->debug_id, rxrpc_call_states[call->state]);
472
473 if (call->state >= RXRPC_CALL_COMPLETE) {
474 conn->channels[call->channel] = NULL;
475 } else {
476 write_unlock_bh(&conn->lock);
477 kmem_cache_free(rxrpc_call_jar, candidate);
478 _leave(" = -EBUSY");
479 return ERR_PTR(-EBUSY);
480 }
481 }
482
483 /* check the call number isn't duplicate */
484 _debug("check dup");
485 call_id = hdr->callNumber;
486 p = &conn->calls.rb_node;
487 parent = NULL;
488 while (*p) {
489 parent = *p;
490 call = rb_entry(parent, struct rxrpc_call, conn_node);
491
7727640c
TS		 492 /* The tree is sorted in order of the __be32 value without
493 * turning it into host order.
494 */
495 if ((__force u32)call_id < (__force u32)call->call_id)
17926a79 496 p = &(*p)->rb_left;
7727640c 497 else if ((__force u32)call_id > (__force u32)call->call_id)
17926a79
DH		 498 p = &(*p)->rb_right;
499 else
500 goto old_call;
501 }
502
503 /* make the call available */
504 _debug("new call");
505 call = candidate;
506 candidate = NULL;
507 rb_link_node(&call->conn_node, parent, p);
508 rb_insert_color(&call->conn_node, &conn->calls);
509 conn->channels[call->channel] = call;
510 sock_hold(&rx->sk);
511 atomic_inc(&conn->usage);
512 write_unlock_bh(&conn->lock);
513
514 spin_lock(&conn->trans->peer->lock);
515 list_add(&call->error_link, &conn->trans->peer->error_targets);
516 spin_unlock(&conn->trans->peer->lock);
517
518 write_lock_bh(&rxrpc_call_lock);
519 list_add_tail(&call->link, &rxrpc_calls);
520 write_unlock_bh(&rxrpc_call_lock);
521
7727640c
TS		 522 /* Record copies of information for hashtable lookup */
523 call->proto = rx->proto;
524 call->local = conn->trans->local;
525 switch (call->proto) {
526 case AF_INET:
527 call->peer_ip.ipv4_addr =
528 conn->trans->peer->srx.transport.sin.sin_addr.s_addr;
529 break;
530 case AF_INET6:
531 memcpy(call->peer_ip.ipv6_addr,
532 conn->trans->peer->srx.transport.sin6.sin6_addr.in6_u.u6_addr8,
533 sizeof(call->peer_ip.ipv6_addr));
534 break;
535 default:
536 break;
537 }
538 call->epoch = conn->epoch;
539 call->service_id = conn->service_id;
540 call->in_clientflag = conn->in_clientflag;
541 /* Add the new call to the hashtable */
542 rxrpc_call_hash_add(call);
543
17926a79
DH		 544 _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id);
545
5873c083 546 call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime;
17926a79
DH		 547 add_timer(&call->lifetimer);
548 _leave(" = %p {%d} [new]", call, call->debug_id);
549 return call;
550
551extant_call:
552 write_unlock_bh(&conn->lock);
553 kmem_cache_free(rxrpc_call_jar, candidate);
554 _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1);
555 return call;
556
557aborted_call:
558 write_unlock_bh(&conn->lock);
559 kmem_cache_free(rxrpc_call_jar, candidate);
560 _leave(" = -ECONNABORTED");
561 return ERR_PTR(-ECONNABORTED);
562
563old_call:
564 write_unlock_bh(&conn->lock);
565 kmem_cache_free(rxrpc_call_jar, candidate);
566 _leave(" = -ECONNRESET [old]");
567 return ERR_PTR(-ECONNRESET);
568}
569
570/*
571 * find an extant server call
572 * - called in process context with IRQs enabled
573 */
574struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *rx,
575 unsigned long user_call_ID)
576{
577 struct rxrpc_call *call;
578 struct rb_node *p;
579
580 _enter("%p,%lx", rx, user_call_ID);
581
582 /* search the extant calls for one that matches the specified user
583 * ID */
584 read_lock(&rx->call_lock);
585
586 p = rx->calls.rb_node;
587 while (p) {
588 call = rb_entry(p, struct rxrpc_call, sock_node);
589
590 if (user_call_ID < call->user_call_ID)
591 p = p->rb_left;
592 else if (user_call_ID > call->user_call_ID)
593 p = p->rb_right;
594 else
595 goto found_extant_call;
596 }
597
598 read_unlock(&rx->call_lock);
599 _leave(" = NULL");
600 return NULL;
601
602 /* we found the call in the list immediately */
603found_extant_call:
604 rxrpc_get_call(call);
605 read_unlock(&rx->call_lock);
606 _leave(" = %p [%d]", call, atomic_read(&call->usage));
607 return call;
608}
609
610/*
611 * detach a call from a socket and set up for release
612 */
613void rxrpc_release_call(struct rxrpc_call *call)
614{
651350d1 615 struct rxrpc_connection *conn = call->conn;
17926a79
DH		 616 struct rxrpc_sock *rx = call->socket;
617
618 _enter("{%d,%d,%d,%d}",
619 call->debug_id, atomic_read(&call->usage),
620 atomic_read(&call->ackr_not_idle),
621 call->rx_first_oos);
622
623 spin_lock_bh(&call->lock);
624 if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
625 BUG();
626 spin_unlock_bh(&call->lock);
627
628 /* dissociate from the socket
629 * - the socket's ref on the call is passed to the death timer
630 */
651350d1 631 _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
17926a79
DH		 632
633 write_lock_bh(&rx->call_lock);
634 if (!list_empty(&call->accept_link)) {
635 _debug("unlinking once-pending call %p { e=%lx f=%lx }",
636 call, call->events, call->flags);
637 ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags));
638 list_del_init(&call->accept_link);
639 sk_acceptq_removed(&rx->sk);
640 } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) {
641 rb_erase(&call->sock_node, &rx->calls);
642 memset(&call->sock_node, 0xdd, sizeof(call->sock_node));
643 clear_bit(RXRPC_CALL_HAS_USERID, &call->flags);
644 }
645 write_unlock_bh(&rx->call_lock);
646
17926a79 647 /* free up the channel for reuse */
651350d1
DH		 648 spin_lock(&conn->trans->client_lock);
649 write_lock_bh(&conn->lock);
650 write_lock(&call->state_lock);
651
652 if (conn->channels[call->channel] == call)
653 conn->channels[call->channel] = NULL;
654
655 if (conn->out_clientflag && conn->bundle) {
656 conn->avail_calls++;
657 switch (conn->avail_calls) {
658 case 1:
659 list_move_tail(&conn->bundle_link,
660 &conn->bundle->avail_conns);
661 case 2 ... RXRPC_MAXCALLS - 1:
662 ASSERT(conn->channels[0] == NULL ||
663 conn->channels[1] == NULL ||
664 conn->channels[2] == NULL ||
665 conn->channels[3] == NULL);
666 break;
667 case RXRPC_MAXCALLS:
668 list_move_tail(&conn->bundle_link,
669 &conn->bundle->unused_conns);
670 ASSERT(conn->channels[0] == NULL &&
671 conn->channels[1] == NULL &&
672 conn->channels[2] == NULL &&
673 conn->channels[3] == NULL);
674 break;
675 default:
676 printk(KERN_ERR "RxRPC: conn->avail_calls=%d\n",
677 conn->avail_calls);
678 BUG();
679 }
17926a79
DH		 680 }
681
651350d1 682 spin_unlock(&conn->trans->client_lock);
17926a79
DH		 683
684 if (call->state < RXRPC_CALL_COMPLETE &&
685 call->state != RXRPC_CALL_CLIENT_FINAL_ACK) {
686 _debug("+++ ABORTING STATE %d +++\n", call->state);
687 call->state = RXRPC_CALL_LOCALLY_ABORTED;
688 call->abort_code = RX_CALL_DEAD;
689 set_bit(RXRPC_CALL_ABORT, &call->events);
651350d1 690 rxrpc_queue_call(call);
17926a79
DH		 691 }
692 write_unlock(&call->state_lock);
651350d1 693 write_unlock_bh(&conn->lock);
17926a79 694
651350d1 695 /* clean up the Rx queue */
17926a79
DH		 696 if (!skb_queue_empty(&call->rx_queue) ||
697 !skb_queue_empty(&call->rx_oos_queue)) {
698 struct rxrpc_skb_priv *sp;
699 struct sk_buff *skb;
700
701 _debug("purge Rx queues");
702
703 spin_lock_bh(&call->lock);
704 while ((skb = skb_dequeue(&call->rx_queue)) ||
705 (skb = skb_dequeue(&call->rx_oos_queue))) {
706 sp = rxrpc_skb(skb);
707 if (sp->call) {
708 ASSERTCMP(sp->call, ==, call);
709 rxrpc_put_call(call);
710 sp->call = NULL;
711 }
712 skb->destructor = NULL;
713 spin_unlock_bh(&call->lock);
714
715 _debug("- zap %s %%%u #%u",
716 rxrpc_pkts[sp->hdr.type],
717 ntohl(sp->hdr.serial),
718 ntohl(sp->hdr.seq));
719 rxrpc_free_skb(skb);
720 spin_lock_bh(&call->lock);
721 }
722 spin_unlock_bh(&call->lock);
723
724 ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE);
725 }
726
727 del_timer_sync(&call->resend_timer);
728 del_timer_sync(&call->ack_timer);
729 del_timer_sync(&call->lifetimer);
5873c083 730 call->deadspan.expires = jiffies + rxrpc_dead_call_expiry;
17926a79
DH		 731 add_timer(&call->deadspan);
732
733 _leave("");
734}
735
736/*
737 * handle a dead call being ready for reaping
738 */
739static void rxrpc_dead_call_expired(unsigned long _call)
740{
741 struct rxrpc_call *call = (struct rxrpc_call *) _call;
742
743 _enter("{%d}", call->debug_id);
744
745 write_lock_bh(&call->state_lock);
746 call->state = RXRPC_CALL_DEAD;
747 write_unlock_bh(&call->state_lock);
748 rxrpc_put_call(call);
749}
750
751/*
752 * mark a call as to be released, aborting it if it's still in progress
753 * - called with softirqs disabled
754 */
755static void rxrpc_mark_call_released(struct rxrpc_call *call)
756{
757 bool sched;
758
759 write_lock(&call->state_lock);
760 if (call->state < RXRPC_CALL_DEAD) {
761 sched = false;
762 if (call->state < RXRPC_CALL_COMPLETE) {
763 _debug("abort call %p", call);
764 call->state = RXRPC_CALL_LOCALLY_ABORTED;
765 call->abort_code = RX_CALL_DEAD;
766 if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events))
767 sched = true;
768 }
769 if (!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events))
770 sched = true;
771 if (sched)
651350d1 772 rxrpc_queue_call(call);
17926a79
DH		 773 }
774 write_unlock(&call->state_lock);
775}
776
777/*
778 * release all the calls associated with a socket
779 */
780void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx)
781{
782 struct rxrpc_call *call;
783 struct rb_node *p;
784
785 _enter("%p", rx);
786
787 read_lock_bh(&rx->call_lock);
788
789 /* mark all the calls as no longer wanting incoming packets */
790 for (p = rb_first(&rx->calls); p; p = rb_next(p)) {
791 call = rb_entry(p, struct rxrpc_call, sock_node);
792 rxrpc_mark_call_released(call);
793 }
794
795 /* kill the not-yet-accepted incoming calls */
796 list_for_each_entry(call, &rx->secureq, accept_link) {
797 rxrpc_mark_call_released(call);
798 }
799
800 list_for_each_entry(call, &rx->acceptq, accept_link) {
801 rxrpc_mark_call_released(call);
802 }
803
804 read_unlock_bh(&rx->call_lock);
805 _leave("");
806}
807
808/*
809 * release a call
810 */
811void __rxrpc_put_call(struct rxrpc_call *call)
812{
813 ASSERT(call != NULL);
814
815 _enter("%p{u=%d}", call, atomic_read(&call->usage));
816
817 ASSERTCMP(atomic_read(&call->usage), >, 0);
818
819 if (atomic_dec_and_test(&call->usage)) {
820 _debug("call %d dead", call->debug_id);
821 ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
651350d1 822 rxrpc_queue_work(&call->destroyer);
17926a79
DH		 823 }
824 _leave("");
825}
826
827/*
828 * clean up a call
829 */
830static void rxrpc_cleanup_call(struct rxrpc_call *call)
831{
832 _net("DESTROY CALL %d", call->debug_id);
833
834 ASSERT(call->socket);
835
836 memset(&call->sock_node, 0xcd, sizeof(call->sock_node));
837
838 del_timer_sync(&call->lifetimer);
839 del_timer_sync(&call->deadspan);
840 del_timer_sync(&call->ack_timer);
841 del_timer_sync(&call->resend_timer);
842
843 ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags));
844 ASSERTCMP(call->events, ==, 0);
845 if (work_pending(&call->processor)) {
846 _debug("defer destroy");
651350d1 847 rxrpc_queue_work(&call->destroyer);
17926a79
DH		 848 return;
849 }
850
851 if (call->conn) {
852 spin_lock(&call->conn->trans->peer->lock);
853 list_del(&call->error_link);
854 spin_unlock(&call->conn->trans->peer->lock);
855
856 write_lock_bh(&call->conn->lock);
857 rb_erase(&call->conn_node, &call->conn->calls);
858 write_unlock_bh(&call->conn->lock);
859 rxrpc_put_connection(call->conn);
860 }
861
7727640c
TS		 862 /* Remove the call from the hash */
863 rxrpc_call_hash_del(call);
864
17926a79
DH		 865 if (call->acks_window) {
866 _debug("kill Tx window %d",
867 CIRC_CNT(call->acks_head, call->acks_tail,
868 call->acks_winsz));
869 smp_mb();
870 while (CIRC_CNT(call->acks_head, call->acks_tail,
871 call->acks_winsz) > 0) {
872 struct rxrpc_skb_priv *sp;
873 unsigned long _skb;
874
875 _skb = call->acks_window[call->acks_tail] & ~1;
876 sp = rxrpc_skb((struct sk_buff *) _skb);
877 _debug("+++ clear Tx %u", ntohl(sp->hdr.seq));
878 rxrpc_free_skb((struct sk_buff *) _skb);
879 call->acks_tail =
880 (call->acks_tail + 1) & (call->acks_winsz - 1);
881 }
882
883 kfree(call->acks_window);
884 }
885
886 rxrpc_free_skb(call->tx_pending);
887
888 rxrpc_purge_queue(&call->rx_queue);
889 ASSERT(skb_queue_empty(&call->rx_oos_queue));
890 sock_put(&call->socket->sk);
891 kmem_cache_free(rxrpc_call_jar, call);
892}
893
894/*
895 * destroy a call
896 */
897static void rxrpc_destroy_call(struct work_struct *work)
898{
899 struct rxrpc_call *call =
900 container_of(work, struct rxrpc_call, destroyer);
901
902 _enter("%p{%d,%d,%p}",
903 call, atomic_read(&call->usage), call->channel, call->conn);
904
905 ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
906
907 write_lock_bh(&rxrpc_call_lock);
908 list_del_init(&call->link);
909 write_unlock_bh(&rxrpc_call_lock);
910
911 rxrpc_cleanup_call(call);
912 _leave("");
913}
914
915/*
916 * preemptively destroy all the call records from a transport endpoint rather
917 * than waiting for them to time out
918 */
919void __exit rxrpc_destroy_all_calls(void)
920{
921 struct rxrpc_call *call;
922
923 _enter("");
924 write_lock_bh(&rxrpc_call_lock);
925
926 while (!list_empty(&rxrpc_calls)) {
927 call = list_entry(rxrpc_calls.next, struct rxrpc_call, link);
928 _debug("Zapping call %p", call);
929
930 list_del_init(&call->link);
931
932 switch (atomic_read(&call->usage)) {
933 case 0:
934 ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);
935 break;
936 case 1:
937 if (del_timer_sync(&call->deadspan) != 0 &&
938 call->state != RXRPC_CALL_DEAD)
939 rxrpc_dead_call_expired((unsigned long) call);
940 if (call->state != RXRPC_CALL_DEAD)
941 break;
942 default:
943 printk(KERN_ERR "RXRPC:"
944 " Call %p still in use (%d,%d,%s,%lx,%lx)!\n",
945 call, atomic_read(&call->usage),
946 atomic_read(&call->ackr_not_idle),
947 rxrpc_call_states[call->state],
948 call->flags, call->events);
949 if (!skb_queue_empty(&call->rx_queue))
950 printk(KERN_ERR"RXRPC: Rx queue occupied\n");
951 if (!skb_queue_empty(&call->rx_oos_queue))
952 printk(KERN_ERR"RXRPC: OOS queue occupied\n");
953 break;
954 }
955
956 write_unlock_bh(&rxrpc_call_lock);
957 cond_resched();
958 write_lock_bh(&rxrpc_call_lock);
959 }
960
961 write_unlock_bh(&rxrpc_call_lock);
962 _leave("");
963}
964
965/*
966 * handle call lifetime being exceeded
967 */
968static void rxrpc_call_life_expired(unsigned long _call)
969{
970 struct rxrpc_call *call = (struct rxrpc_call *) _call;
971
972 if (call->state >= RXRPC_CALL_COMPLETE)
973 return;
974
975 _enter("{%d}", call->debug_id);
976 read_lock_bh(&call->state_lock);
977 if (call->state < RXRPC_CALL_COMPLETE) {
978 set_bit(RXRPC_CALL_LIFE_TIMER, &call->events);
651350d1 979 rxrpc_queue_call(call);
17926a79
DH		 980 }
981 read_unlock_bh(&call->state_lock);
982}
983
984/*
985 * handle resend timer expiry
3b5bac2b 986 * - may not take call->state_lock as this can deadlock against del_timer_sync()
17926a79
DH		 987 */
988static void rxrpc_resend_time_expired(unsigned long _call)
989{
990 struct rxrpc_call *call = (struct rxrpc_call *) _call;
991
992 _enter("{%d}", call->debug_id);
993
994 if (call->state >= RXRPC_CALL_COMPLETE)
995 return;
996
17926a79 997 clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags);
3b5bac2b 998 if (!test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events))
651350d1 999 rxrpc_queue_call(call);
17926a79
DH		 1000}
1001
1002/*
1003 * handle ACK timer expiry
1004 */
1005static void rxrpc_ack_time_expired(unsigned long _call)
1006{
1007 struct rxrpc_call *call = (struct rxrpc_call *) _call;
1008
1009 _enter("{%d}", call->debug_id);
1010
1011 if (call->state >= RXRPC_CALL_COMPLETE)
1012 return;
1013
1014 read_lock_bh(&call->state_lock);
1015 if (call->state < RXRPC_CALL_COMPLETE &&
1016 !test_and_set_bit(RXRPC_CALL_ACK, &call->events))
651350d1 1017 rxrpc_queue_call(call);
17926a79
DH		 1018 read_unlock_bh(&call->state_lock);
1019}
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