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12#include <linux/module.h>
13#include <linux/slab.h>
14#include <linux/net.h>
15#include <linux/skbuff.h>
16#include <linux/crypto.h>
17#include <net/sock.h>
18#include <net/af_rxrpc.h>
19#include "ar-internal.h"
20
21
22
23
24unsigned rxrpc_connection_expiry = 10 * 60;
25
26static void rxrpc_connection_reaper(struct work_struct *work);
27
28LIST_HEAD(rxrpc_connections);
29DEFINE_RWLOCK(rxrpc_connection_lock);
30static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper);
31
32
33
34
35static struct rxrpc_conn_bundle *rxrpc_alloc_bundle(gfp_t gfp)
36{
37 struct rxrpc_conn_bundle *bundle;
38
39 _enter("");
40
41 bundle = kzalloc(sizeof(struct rxrpc_conn_bundle), gfp);
42 if (bundle) {
43 INIT_LIST_HEAD(&bundle->unused_conns);
44 INIT_LIST_HEAD(&bundle->avail_conns);
45 INIT_LIST_HEAD(&bundle->busy_conns);
46 init_waitqueue_head(&bundle->chanwait);
47 atomic_set(&bundle->usage, 1);
48 }
49
50 _leave(" = %p", bundle);
51 return bundle;
52}
53
54
55
56
57
58static inline
59int rxrpc_cmp_bundle(const struct rxrpc_conn_bundle *bundle,
60 struct key *key, __be16 service_id)
61{
62 return (bundle->service_id - service_id) ?:
63 ((unsigned long) bundle->key - (unsigned long) key);
64}
65
66
67
68
69struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *rx,
70 struct rxrpc_transport *trans,
71 struct key *key,
72 __be16 service_id,
73 gfp_t gfp)
74{
75 struct rxrpc_conn_bundle *bundle, *candidate;
76 struct rb_node *p, *parent, **pp;
77
78 _enter("%p{%x},%x,%hx,",
79 rx, key_serial(key), trans->debug_id, ntohs(service_id));
80
81 if (rx->trans == trans && rx->bundle) {
82 atomic_inc(&rx->bundle->usage);
83 return rx->bundle;
84 }
85
86
87
88 spin_lock(&trans->client_lock);
89
90 p = trans->bundles.rb_node;
91 while (p) {
92 bundle = rb_entry(p, struct rxrpc_conn_bundle, node);
93
94 if (rxrpc_cmp_bundle(bundle, key, service_id) < 0)
95 p = p->rb_left;
96 else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0)
97 p = p->rb_right;
98 else
99 goto found_extant_bundle;
100 }
101
102 spin_unlock(&trans->client_lock);
103
104
105
106 candidate = rxrpc_alloc_bundle(gfp);
107 if (!candidate) {
108 _leave(" = -ENOMEM");
109 return ERR_PTR(-ENOMEM);
110 }
111
112 candidate->key = key_get(key);
113 candidate->service_id = service_id;
114
115 spin_lock(&trans->client_lock);
116
117 pp = &trans->bundles.rb_node;
118 parent = NULL;
119 while (*pp) {
120 parent = *pp;
121 bundle = rb_entry(parent, struct rxrpc_conn_bundle, node);
122
123 if (rxrpc_cmp_bundle(bundle, key, service_id) < 0)
124 pp = &(*pp)->rb_left;
125 else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0)
126 pp = &(*pp)->rb_right;
127 else
128 goto found_extant_second;
129 }
130
131
132 bundle = candidate;
133 candidate = NULL;
134
135 rb_link_node(&bundle->node, parent, pp);
136 rb_insert_color(&bundle->node, &trans->bundles);
137 spin_unlock(&trans->client_lock);
138 _net("BUNDLE new on trans %d", trans->debug_id);
139 if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
140 atomic_inc(&bundle->usage);
141 rx->bundle = bundle;
142 }
143 _leave(" = %p [new]", bundle);
144 return bundle;
145
146
147found_extant_bundle:
148 atomic_inc(&bundle->usage);
149 spin_unlock(&trans->client_lock);
150 _net("BUNDLE old on trans %d", trans->debug_id);
151 if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
152 atomic_inc(&bundle->usage);
153 rx->bundle = bundle;
154 }
155 _leave(" = %p [extant %d]", bundle, atomic_read(&bundle->usage));
156 return bundle;
157
158
159found_extant_second:
160 atomic_inc(&bundle->usage);
161 spin_unlock(&trans->client_lock);
162 kfree(candidate);
163 _net("BUNDLE old2 on trans %d", trans->debug_id);
164 if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) {
165 atomic_inc(&bundle->usage);
166 rx->bundle = bundle;
167 }
168 _leave(" = %p [second %d]", bundle, atomic_read(&bundle->usage));
169 return bundle;
170}
171
172
173
174
175void rxrpc_put_bundle(struct rxrpc_transport *trans,
176 struct rxrpc_conn_bundle *bundle)
177{
178 _enter("%p,%p{%d}",trans, bundle, atomic_read(&bundle->usage));
179
180 if (atomic_dec_and_lock(&bundle->usage, &trans->client_lock)) {
181 _debug("Destroy bundle");
182 rb_erase(&bundle->node, &trans->bundles);
183 spin_unlock(&trans->client_lock);
184 ASSERT(list_empty(&bundle->unused_conns));
185 ASSERT(list_empty(&bundle->avail_conns));
186 ASSERT(list_empty(&bundle->busy_conns));
187 ASSERTCMP(bundle->num_conns, ==, 0);
188 key_put(bundle->key);
189 kfree(bundle);
190 }
191
192 _leave("");
193}
194
195
196
197
198static struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp)
199{
200 struct rxrpc_connection *conn;
201
202 _enter("");
203
204 conn = kzalloc(sizeof(struct rxrpc_connection), gfp);
205 if (conn) {
206 INIT_WORK(&conn->processor, &rxrpc_process_connection);
207 INIT_LIST_HEAD(&conn->bundle_link);
208 conn->calls = RB_ROOT;
209 skb_queue_head_init(&conn->rx_queue);
210 rwlock_init(&conn->lock);
211 spin_lock_init(&conn->state_lock);
212 atomic_set(&conn->usage, 1);
213 conn->debug_id = atomic_inc_return(&rxrpc_debug_id);
214 conn->avail_calls = RXRPC_MAXCALLS;
215 conn->size_align = 4;
216 conn->header_size = sizeof(struct rxrpc_header);
217 }
218
219 _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0);
220 return conn;
221}
222
223
224
225
226
227
228static void rxrpc_assign_connection_id(struct rxrpc_connection *conn)
229{
230 struct rxrpc_connection *xconn;
231 struct rb_node *parent, **p;
232 __be32 epoch;
233 u32 real_conn_id;
234
235 _enter("");
236
237 epoch = conn->epoch;
238
239 write_lock_bh(&conn->trans->conn_lock);
240
241 conn->trans->conn_idcounter += RXRPC_CID_INC;
242 if (conn->trans->conn_idcounter < RXRPC_CID_INC)
243 conn->trans->conn_idcounter = RXRPC_CID_INC;
244 real_conn_id = conn->trans->conn_idcounter;
245
246attempt_insertion:
247 parent = NULL;
248 p = &conn->trans->client_conns.rb_node;
249
250 while (*p) {
251 parent = *p;
252 xconn = rb_entry(parent, struct rxrpc_connection, node);
253
254 if (epoch < xconn->epoch)
255 p = &(*p)->rb_left;
256 else if (epoch > xconn->epoch)
257 p = &(*p)->rb_right;
258 else if (real_conn_id < xconn->real_conn_id)
259 p = &(*p)->rb_left;
260 else if (real_conn_id > xconn->real_conn_id)
261 p = &(*p)->rb_right;
262 else
263 goto id_exists;
264 }
265
266
267
268 rb_link_node(&conn->node, parent, p);
269 rb_insert_color(&conn->node, &conn->trans->client_conns);
270
271 conn->real_conn_id = real_conn_id;
272 conn->cid = htonl(real_conn_id);
273 write_unlock_bh(&conn->trans->conn_lock);
274 _leave(" [CONNID %x CID %x]", real_conn_id, ntohl(conn->cid));
275 return;
276
277
278
279id_exists:
280 for (;;) {
281 real_conn_id += RXRPC_CID_INC;
282 if (real_conn_id < RXRPC_CID_INC) {
283 real_conn_id = RXRPC_CID_INC;
284 conn->trans->conn_idcounter = real_conn_id;
285 goto attempt_insertion;
286 }
287
288 parent = rb_next(parent);
289 if (!parent)
290 goto attempt_insertion;
291
292 xconn = rb_entry(parent, struct rxrpc_connection, node);
293 if (epoch < xconn->epoch ||
294 real_conn_id < xconn->real_conn_id)
295 goto attempt_insertion;
296 }
297}
298
299
300
301
302static void rxrpc_add_call_ID_to_conn(struct rxrpc_connection *conn,
303 struct rxrpc_call *call)
304{
305 struct rxrpc_call *xcall;
306 struct rb_node *parent, **p;
307 __be32 call_id;
308
309 write_lock_bh(&conn->lock);
310
311 call_id = call->call_id;
312 p = &conn->calls.rb_node;
313 parent = NULL;
314 while (*p) {
315 parent = *p;
316 xcall = rb_entry(parent, struct rxrpc_call, conn_node);
317
318 if (call_id < xcall->call_id)
319 p = &(*p)->rb_left;
320 else if (call_id > xcall->call_id)
321 p = &(*p)->rb_right;
322 else
323 BUG();
324 }
325
326 rb_link_node(&call->conn_node, parent, p);
327 rb_insert_color(&call->conn_node, &conn->calls);
328
329 write_unlock_bh(&conn->lock);
330}
331
332
333
334
335static int rxrpc_connect_exclusive(struct rxrpc_sock *rx,
336 struct rxrpc_transport *trans,
337 __be16 service_id,
338 struct rxrpc_call *call,
339 gfp_t gfp)
340{
341 struct rxrpc_connection *conn;
342 int chan, ret;
343
344 _enter("");
345
346 conn = rx->conn;
347 if (!conn) {
348
349
350 conn = rxrpc_alloc_connection(gfp);
351 if (!conn) {
352 _leave(" = -ENOMEM");
353 return -ENOMEM;
354 }
355
356 conn->trans = trans;
357 conn->bundle = NULL;
358 conn->service_id = service_id;
359 conn->epoch = rxrpc_epoch;
360 conn->in_clientflag = 0;
361 conn->out_clientflag = RXRPC_CLIENT_INITIATED;
362 conn->cid = 0;
363 conn->state = RXRPC_CONN_CLIENT;
364 conn->avail_calls = RXRPC_MAXCALLS - 1;
365 conn->security_level = rx->min_sec_level;
366 conn->key = key_get(rx->key);
367
368 ret = rxrpc_init_client_conn_security(conn);
369 if (ret < 0) {
370 key_put(conn->key);
371 kfree(conn);
372 _leave(" = %d [key]", ret);
373 return ret;
374 }
375
376 write_lock_bh(&rxrpc_connection_lock);
377 list_add_tail(&conn->link, &rxrpc_connections);
378 write_unlock_bh(&rxrpc_connection_lock);
379
380 spin_lock(&trans->client_lock);
381 atomic_inc(&trans->usage);
382
383 _net("CONNECT EXCL new %d on TRANS %d",
384 conn->debug_id, conn->trans->debug_id);
385
386 rxrpc_assign_connection_id(conn);
387 rx->conn = conn;
388 } else {
389 spin_lock(&trans->client_lock);
390 }
391
392
393
394
395
396
397 for (chan = 0; chan < RXRPC_MAXCALLS; chan++)
398 if (!conn->channels[chan])
399 goto found_channel;
400 goto no_free_channels;
401
402found_channel:
403 atomic_inc(&conn->usage);
404 conn->channels[chan] = call;
405 call->conn = conn;
406 call->channel = chan;
407 call->cid = conn->cid | htonl(chan);
408 call->call_id = htonl(++conn->call_counter);
409
410 _net("CONNECT client on conn %d chan %d as call %x",
411 conn->debug_id, chan, ntohl(call->call_id));
412
413 spin_unlock(&trans->client_lock);
414
415 rxrpc_add_call_ID_to_conn(conn, call);
416 _leave(" = 0");
417 return 0;
418
419no_free_channels:
420 spin_unlock(&trans->client_lock);
421 _leave(" = -ENOSR");
422 return -ENOSR;
423}
424
425
426
427
428
429int rxrpc_connect_call(struct rxrpc_sock *rx,
430 struct rxrpc_transport *trans,
431 struct rxrpc_conn_bundle *bundle,
432 struct rxrpc_call *call,
433 gfp_t gfp)
434{
435 struct rxrpc_connection *conn, *candidate;
436 int chan, ret;
437
438 DECLARE_WAITQUEUE(myself, current);
439
440 _enter("%p,%lx,", rx, call->user_call_ID);
441
442 if (test_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags))
443 return rxrpc_connect_exclusive(rx, trans, bundle->service_id,
444 call, gfp);
445
446 spin_lock(&trans->client_lock);
447 for (;;) {
448
449 if (!list_empty(&bundle->avail_conns)) {
450 _debug("avail");
451 conn = list_entry(bundle->avail_conns.next,
452 struct rxrpc_connection,
453 bundle_link);
454 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
455 list_del_init(&conn->bundle_link);
456 bundle->num_conns--;
457 continue;
458 }
459 if (--conn->avail_calls == 0)
460 list_move(&conn->bundle_link,
461 &bundle->busy_conns);
462 ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS);
463 ASSERT(conn->channels[0] == NULL ||
464 conn->channels[1] == NULL ||
465 conn->channels[2] == NULL ||
466 conn->channels[3] == NULL);
467 atomic_inc(&conn->usage);
468 break;
469 }
470
471 if (!list_empty(&bundle->unused_conns)) {
472 _debug("unused");
473 conn = list_entry(bundle->unused_conns.next,
474 struct rxrpc_connection,
475 bundle_link);
476 if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) {
477 list_del_init(&conn->bundle_link);
478 bundle->num_conns--;
479 continue;
480 }
481 ASSERTCMP(conn->avail_calls, ==, RXRPC_MAXCALLS);
482 conn->avail_calls = RXRPC_MAXCALLS - 1;
483 ASSERT(conn->channels[0] == NULL &&
484 conn->channels[1] == NULL &&
485 conn->channels[2] == NULL &&
486 conn->channels[3] == NULL);
487 atomic_inc(&conn->usage);
488 list_move(&conn->bundle_link, &bundle->avail_conns);
489 break;
490 }
491
492
493 _debug("get new conn [%d]", bundle->num_conns);
494
495 spin_unlock(&trans->client_lock);
496
497 if (signal_pending(current))
498 goto interrupted;
499
500 if (bundle->num_conns >= 20) {
501 _debug("too many conns");
502
503 if (!(gfp & __GFP_WAIT)) {
504 _leave(" = -EAGAIN");
505 return -EAGAIN;
506 }
507
508 add_wait_queue(&bundle->chanwait, &myself);
509 for (;;) {
510 set_current_state(TASK_INTERRUPTIBLE);
511 if (bundle->num_conns < 20 ||
512 !list_empty(&bundle->unused_conns) ||
513 !list_empty(&bundle->avail_conns))
514 break;
515 if (signal_pending(current))
516 goto interrupted_dequeue;
517 schedule();
518 }
519 remove_wait_queue(&bundle->chanwait, &myself);
520 __set_current_state(TASK_RUNNING);
521 spin_lock(&trans->client_lock);
522 continue;
523 }
524
525
526
527 candidate = rxrpc_alloc_connection(gfp);
528 if (!candidate) {
529 _leave(" = -ENOMEM");
530 return -ENOMEM;
531 }
532
533 candidate->trans = trans;
534 candidate->bundle = bundle;
535 candidate->service_id = bundle->service_id;
536 candidate->epoch = rxrpc_epoch;
537 candidate->in_clientflag = 0;
538 candidate->out_clientflag = RXRPC_CLIENT_INITIATED;
539 candidate->cid = 0;
540 candidate->state = RXRPC_CONN_CLIENT;
541 candidate->avail_calls = RXRPC_MAXCALLS;
542 candidate->security_level = rx->min_sec_level;
543 candidate->key = key_get(bundle->key);
544
545 ret = rxrpc_init_client_conn_security(candidate);
546 if (ret < 0) {
547 key_put(candidate->key);
548 kfree(candidate);
549 _leave(" = %d [key]", ret);
550 return ret;
551 }
552
553 write_lock_bh(&rxrpc_connection_lock);
554 list_add_tail(&candidate->link, &rxrpc_connections);
555 write_unlock_bh(&rxrpc_connection_lock);
556
557 spin_lock(&trans->client_lock);
558
559 list_add(&candidate->bundle_link, &bundle->unused_conns);
560 bundle->num_conns++;
561 atomic_inc(&bundle->usage);
562 atomic_inc(&trans->usage);
563
564 _net("CONNECT new %d on TRANS %d",
565 candidate->debug_id, candidate->trans->debug_id);
566
567 rxrpc_assign_connection_id(candidate);
568 if (candidate->security)
569 candidate->security->prime_packet_security(candidate);
570
571
572
573 rxrpc_put_connection(candidate);
574 candidate = NULL;
575 }
576
577
578
579
580
581
582
583 for (chan = 0; chan < RXRPC_MAXCALLS; chan++)
584 if (!conn->channels[chan])
585 goto found_channel;
586 ASSERT(conn->channels[0] == NULL ||
587 conn->channels[1] == NULL ||
588 conn->channels[2] == NULL ||
589 conn->channels[3] == NULL);
590 BUG();
591
592found_channel:
593 conn->channels[chan] = call;
594 call->conn = conn;
595 call->channel = chan;
596 call->cid = conn->cid | htonl(chan);
597 call->call_id = htonl(++conn->call_counter);
598
599 _net("CONNECT client on conn %d chan %d as call %x",
600 conn->debug_id, chan, ntohl(call->call_id));
601
602 ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS);
603 spin_unlock(&trans->client_lock);
604
605 rxrpc_add_call_ID_to_conn(conn, call);
606
607 _leave(" = 0");
608 return 0;
609
610interrupted_dequeue:
611 remove_wait_queue(&bundle->chanwait, &myself);
612 __set_current_state(TASK_RUNNING);
613interrupted:
614 _leave(" = -ERESTARTSYS");
615 return -ERESTARTSYS;
616}
617
618
619
620
621struct rxrpc_connection *
622rxrpc_incoming_connection(struct rxrpc_transport *trans,
623 struct rxrpc_header *hdr,
624 gfp_t gfp)
625{
626 struct rxrpc_connection *conn, *candidate = NULL;
627 struct rb_node *p, **pp;
628 const char *new = "old";
629 __be32 epoch;
630 u32 conn_id;
631
632 _enter("");
633
634 ASSERT(hdr->flags & RXRPC_CLIENT_INITIATED);
635
636 epoch = hdr->epoch;
637 conn_id = ntohl(hdr->cid) & RXRPC_CIDMASK;
638
639
640 read_lock_bh(&trans->conn_lock);
641
642 p = trans->server_conns.rb_node;
643 while (p) {
644 conn = rb_entry(p, struct rxrpc_connection, node);
645
646 _debug("maybe %x", conn->real_conn_id);
647
648 if (epoch < conn->epoch)
649 p = p->rb_left;
650 else if (epoch > conn->epoch)
651 p = p->rb_right;
652 else if (conn_id < conn->real_conn_id)
653 p = p->rb_left;
654 else if (conn_id > conn->real_conn_id)
655 p = p->rb_right;
656 else
657 goto found_extant_connection;
658 }
659 read_unlock_bh(&trans->conn_lock);
660
661
662
663 candidate = rxrpc_alloc_connection(gfp);
664 if (!candidate) {
665 _leave(" = -ENOMEM");
666 return ERR_PTR(-ENOMEM);
667 }
668
669 candidate->trans = trans;
670 candidate->epoch = hdr->epoch;
671 candidate->cid = hdr->cid & cpu_to_be32(RXRPC_CIDMASK);
672 candidate->service_id = hdr->serviceId;
673 candidate->security_ix = hdr->securityIndex;
674 candidate->in_clientflag = RXRPC_CLIENT_INITIATED;
675 candidate->out_clientflag = 0;
676 candidate->real_conn_id = conn_id;
677 candidate->state = RXRPC_CONN_SERVER;
678 if (candidate->service_id)
679 candidate->state = RXRPC_CONN_SERVER_UNSECURED;
680
681 write_lock_bh(&trans->conn_lock);
682
683 pp = &trans->server_conns.rb_node;
684 p = NULL;
685 while (*pp) {
686 p = *pp;
687 conn = rb_entry(p, struct rxrpc_connection, node);
688
689 if (epoch < conn->epoch)
690 pp = &(*pp)->rb_left;
691 else if (epoch > conn->epoch)
692 pp = &(*pp)->rb_right;
693 else if (conn_id < conn->real_conn_id)
694 pp = &(*pp)->rb_left;
695 else if (conn_id > conn->real_conn_id)
696 pp = &(*pp)->rb_right;
697 else
698 goto found_extant_second;
699 }
700
701
702 conn = candidate;
703 candidate = NULL;
704 rb_link_node(&conn->node, p, pp);
705 rb_insert_color(&conn->node, &trans->server_conns);
706 atomic_inc(&conn->trans->usage);
707
708 write_unlock_bh(&trans->conn_lock);
709
710 write_lock_bh(&rxrpc_connection_lock);
711 list_add_tail(&conn->link, &rxrpc_connections);
712 write_unlock_bh(&rxrpc_connection_lock);
713
714 new = "new";
715
716success:
717 _net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->real_conn_id);
718
719 _leave(" = %p {u=%d}", conn, atomic_read(&conn->usage));
720 return conn;
721
722
723found_extant_connection:
724 if (hdr->securityIndex != conn->security_ix) {
725 read_unlock_bh(&trans->conn_lock);
726 goto security_mismatch;
727 }
728 atomic_inc(&conn->usage);
729 read_unlock_bh(&trans->conn_lock);
730 goto success;
731
732
733found_extant_second:
734 if (hdr->securityIndex != conn->security_ix) {
735 write_unlock_bh(&trans->conn_lock);
736 goto security_mismatch;
737 }
738 atomic_inc(&conn->usage);
739 write_unlock_bh(&trans->conn_lock);
740 kfree(candidate);
741 goto success;
742
743security_mismatch:
744 kfree(candidate);
745 _leave(" = -EKEYREJECTED");
746 return ERR_PTR(-EKEYREJECTED);
747}
748
749
750
751
752
753struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans,
754 struct rxrpc_header *hdr)
755{
756 struct rxrpc_connection *conn;
757 struct rb_node *p;
758 __be32 epoch;
759 u32 conn_id;
760
761 _enter(",{%x,%x}", ntohl(hdr->cid), hdr->flags);
762
763 read_lock_bh(&trans->conn_lock);
764
765 conn_id = ntohl(hdr->cid) & RXRPC_CIDMASK;
766 epoch = hdr->epoch;
767
768 if (hdr->flags & RXRPC_CLIENT_INITIATED)
769 p = trans->server_conns.rb_node;
770 else
771 p = trans->client_conns.rb_node;
772
773 while (p) {
774 conn = rb_entry(p, struct rxrpc_connection, node);
775
776 _debug("maybe %x", conn->real_conn_id);
777
778 if (epoch < conn->epoch)
779 p = p->rb_left;
780 else if (epoch > conn->epoch)
781 p = p->rb_right;
782 else if (conn_id < conn->real_conn_id)
783 p = p->rb_left;
784 else if (conn_id > conn->real_conn_id)
785 p = p->rb_right;
786 else
787 goto found;
788 }
789
790 read_unlock_bh(&trans->conn_lock);
791 _leave(" = NULL");
792 return NULL;
793
794found:
795 atomic_inc(&conn->usage);
796 read_unlock_bh(&trans->conn_lock);
797 _leave(" = %p", conn);
798 return conn;
799}
800
801
802
803
804void rxrpc_put_connection(struct rxrpc_connection *conn)
805{
806 _enter("%p{u=%d,d=%d}",
807 conn, atomic_read(&conn->usage), conn->debug_id);
808
809 ASSERTCMP(atomic_read(&conn->usage), >, 0);
810
811 conn->put_time = get_seconds();
812 if (atomic_dec_and_test(&conn->usage)) {
813 _debug("zombie");
814 rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
815 }
816
817 _leave("");
818}
819
820
821
822
823static void rxrpc_destroy_connection(struct rxrpc_connection *conn)
824{
825 _enter("%p{%d}", conn, atomic_read(&conn->usage));
826
827 ASSERTCMP(atomic_read(&conn->usage), ==, 0);
828
829 _net("DESTROY CONN %d", conn->debug_id);
830
831 if (conn->bundle)
832 rxrpc_put_bundle(conn->trans, conn->bundle);
833
834 ASSERT(RB_EMPTY_ROOT(&conn->calls));
835 rxrpc_purge_queue(&conn->rx_queue);
836
837 rxrpc_clear_conn_security(conn);
838 rxrpc_put_transport(conn->trans);
839 kfree(conn);
840 _leave("");
841}
842
843
844
845
846static void rxrpc_connection_reaper(struct work_struct *work)
847{
848 struct rxrpc_connection *conn, *_p;
849 unsigned long now, earliest, reap_time;
850
851 LIST_HEAD(graveyard);
852
853 _enter("");
854
855 now = get_seconds();
856 earliest = ULONG_MAX;
857
858 write_lock_bh(&rxrpc_connection_lock);
859 list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) {
860 _debug("reap CONN %d { u=%d,t=%ld }",
861 conn->debug_id, atomic_read(&conn->usage),
862 (long) now - (long) conn->put_time);
863
864 if (likely(atomic_read(&conn->usage) > 0))
865 continue;
866
867 spin_lock(&conn->trans->client_lock);
868 write_lock(&conn->trans->conn_lock);
869 reap_time = conn->put_time + rxrpc_connection_expiry;
870
871 if (atomic_read(&conn->usage) > 0) {
872 ;
873 } else if (reap_time <= now) {
874 list_move_tail(&conn->link, &graveyard);
875 if (conn->out_clientflag)
876 rb_erase(&conn->node,
877 &conn->trans->client_conns);
878 else
879 rb_erase(&conn->node,
880 &conn->trans->server_conns);
881 if (conn->bundle) {
882 list_del_init(&conn->bundle_link);
883 conn->bundle->num_conns--;
884 }
885
886 } else if (reap_time < earliest) {
887 earliest = reap_time;
888 }
889
890 write_unlock(&conn->trans->conn_lock);
891 spin_unlock(&conn->trans->client_lock);
892 }
893 write_unlock_bh(&rxrpc_connection_lock);
894
895 if (earliest != ULONG_MAX) {
896 _debug("reschedule reaper %ld", (long) earliest - now);
897 ASSERTCMP(earliest, >, now);
898 rxrpc_queue_delayed_work(&rxrpc_connection_reap,
899 (earliest - now) * HZ);
900 }
901
902
903 while (!list_empty(&graveyard)) {
904 conn = list_entry(graveyard.next, struct rxrpc_connection,
905 link);
906 list_del_init(&conn->link);
907
908 ASSERTCMP(atomic_read(&conn->usage), ==, 0);
909 rxrpc_destroy_connection(conn);
910 }
911
912 _leave("");
913}
914
915
916
917
918
919void __exit rxrpc_destroy_all_connections(void)
920{
921 _enter("");
922
923 rxrpc_connection_expiry = 0;
924 cancel_delayed_work(&rxrpc_connection_reap);
925 rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0);
926
927 _leave("");
928}
929
