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