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17926a79 DH |
1 | /* RxRPC virtual connection handler |
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 | #include <linux/module.h> | |
5a0e3ad6 | 13 | #include <linux/slab.h> |
17926a79 DH |
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 | static void rxrpc_connection_reaper(struct work_struct *work); | |
22 | ||
23 | LIST_HEAD(rxrpc_connections); | |
24 | DEFINE_RWLOCK(rxrpc_connection_lock); | |
25 | static unsigned long rxrpc_connection_timeout = 10 * 60; | |
26 | static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper); | |
27 | ||
28 | /* | |
29 | * allocate a new client connection bundle | |
30 | */ | |
31 | static struct rxrpc_conn_bundle *rxrpc_alloc_bundle(gfp_t gfp) | |
32 | { | |
33 | struct rxrpc_conn_bundle *bundle; | |
34 | ||
35 | _enter(""); | |
36 | ||
37 | bundle = kzalloc(sizeof(struct rxrpc_conn_bundle), gfp); | |
38 | if (bundle) { | |
39 | INIT_LIST_HEAD(&bundle->unused_conns); | |
40 | INIT_LIST_HEAD(&bundle->avail_conns); | |
41 | INIT_LIST_HEAD(&bundle->busy_conns); | |
42 | init_waitqueue_head(&bundle->chanwait); | |
43 | atomic_set(&bundle->usage, 1); | |
44 | } | |
45 | ||
46 | _leave(" = %p", bundle); | |
47 | return bundle; | |
48 | } | |
49 | ||
50 | /* | |
51 | * compare bundle parameters with what we're looking for | |
52 | * - return -ve, 0 or +ve | |
53 | */ | |
54 | static inline | |
55 | int rxrpc_cmp_bundle(const struct rxrpc_conn_bundle *bundle, | |
56 | struct key *key, __be16 service_id) | |
57 | { | |
58 | return (bundle->service_id - service_id) ?: | |
59 | ((unsigned long) bundle->key - (unsigned long) key); | |
60 | } | |
61 | ||
62 | /* | |
63 | * get bundle of client connections that a client socket can make use of | |
64 | */ | |
65 | struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *rx, | |
66 | struct rxrpc_transport *trans, | |
67 | struct key *key, | |
68 | __be16 service_id, | |
69 | gfp_t gfp) | |
70 | { | |
71 | struct rxrpc_conn_bundle *bundle, *candidate; | |
72 | struct rb_node *p, *parent, **pp; | |
73 | ||
74 | _enter("%p{%x},%x,%hx,", | |
582ee43d | 75 | rx, key_serial(key), trans->debug_id, ntohs(service_id)); |
17926a79 DH |
76 | |
77 | if (rx->trans == trans && rx->bundle) { | |
78 | atomic_inc(&rx->bundle->usage); | |
79 | return rx->bundle; | |
80 | } | |
81 | ||
82 | /* search the extant bundles first for one that matches the specified | |
83 | * user ID */ | |
84 | spin_lock(&trans->client_lock); | |
85 | ||
86 | p = trans->bundles.rb_node; | |
87 | while (p) { | |
88 | bundle = rb_entry(p, struct rxrpc_conn_bundle, node); | |
89 | ||
90 | if (rxrpc_cmp_bundle(bundle, key, service_id) < 0) | |
91 | p = p->rb_left; | |
92 | else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0) | |
93 | p = p->rb_right; | |
94 | else | |
95 | goto found_extant_bundle; | |
96 | } | |
97 | ||
98 | spin_unlock(&trans->client_lock); | |
99 | ||
100 | /* not yet present - create a candidate for a new record and then | |
101 | * redo the search */ | |
102 | candidate = rxrpc_alloc_bundle(gfp); | |
103 | if (!candidate) { | |
104 | _leave(" = -ENOMEM"); | |
105 | return ERR_PTR(-ENOMEM); | |
106 | } | |
107 | ||
108 | candidate->key = key_get(key); | |
109 | candidate->service_id = service_id; | |
110 | ||
111 | spin_lock(&trans->client_lock); | |
112 | ||
113 | pp = &trans->bundles.rb_node; | |
114 | parent = NULL; | |
115 | while (*pp) { | |
116 | parent = *pp; | |
117 | bundle = rb_entry(parent, struct rxrpc_conn_bundle, node); | |
118 | ||
119 | if (rxrpc_cmp_bundle(bundle, key, service_id) < 0) | |
120 | pp = &(*pp)->rb_left; | |
121 | else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0) | |
122 | pp = &(*pp)->rb_right; | |
123 | else | |
124 | goto found_extant_second; | |
125 | } | |
126 | ||
127 | /* second search also failed; add the new bundle */ | |
128 | bundle = candidate; | |
129 | candidate = NULL; | |
130 | ||
131 | rb_link_node(&bundle->node, parent, pp); | |
132 | rb_insert_color(&bundle->node, &trans->bundles); | |
133 | spin_unlock(&trans->client_lock); | |
134 | _net("BUNDLE new on trans %d", trans->debug_id); | |
135 | if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) { | |
136 | atomic_inc(&bundle->usage); | |
137 | rx->bundle = bundle; | |
138 | } | |
139 | _leave(" = %p [new]", bundle); | |
140 | return bundle; | |
141 | ||
142 | /* we found the bundle in the list immediately */ | |
143 | found_extant_bundle: | |
144 | atomic_inc(&bundle->usage); | |
145 | spin_unlock(&trans->client_lock); | |
146 | _net("BUNDLE old on trans %d", trans->debug_id); | |
147 | if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) { | |
148 | atomic_inc(&bundle->usage); | |
149 | rx->bundle = bundle; | |
150 | } | |
151 | _leave(" = %p [extant %d]", bundle, atomic_read(&bundle->usage)); | |
152 | return bundle; | |
153 | ||
154 | /* we found the bundle on the second time through the list */ | |
155 | found_extant_second: | |
156 | atomic_inc(&bundle->usage); | |
157 | spin_unlock(&trans->client_lock); | |
158 | kfree(candidate); | |
159 | _net("BUNDLE old2 on trans %d", trans->debug_id); | |
160 | if (!rx->bundle && rx->sk.sk_state == RXRPC_CLIENT_CONNECTED) { | |
161 | atomic_inc(&bundle->usage); | |
162 | rx->bundle = bundle; | |
163 | } | |
164 | _leave(" = %p [second %d]", bundle, atomic_read(&bundle->usage)); | |
165 | return bundle; | |
166 | } | |
167 | ||
168 | /* | |
169 | * release a bundle | |
170 | */ | |
171 | void rxrpc_put_bundle(struct rxrpc_transport *trans, | |
172 | struct rxrpc_conn_bundle *bundle) | |
173 | { | |
174 | _enter("%p,%p{%d}",trans, bundle, atomic_read(&bundle->usage)); | |
175 | ||
176 | if (atomic_dec_and_lock(&bundle->usage, &trans->client_lock)) { | |
177 | _debug("Destroy bundle"); | |
178 | rb_erase(&bundle->node, &trans->bundles); | |
179 | spin_unlock(&trans->client_lock); | |
180 | ASSERT(list_empty(&bundle->unused_conns)); | |
181 | ASSERT(list_empty(&bundle->avail_conns)); | |
182 | ASSERT(list_empty(&bundle->busy_conns)); | |
183 | ASSERTCMP(bundle->num_conns, ==, 0); | |
184 | key_put(bundle->key); | |
185 | kfree(bundle); | |
186 | } | |
187 | ||
188 | _leave(""); | |
189 | } | |
190 | ||
191 | /* | |
192 | * allocate a new connection | |
193 | */ | |
194 | static struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp) | |
195 | { | |
196 | struct rxrpc_connection *conn; | |
197 | ||
198 | _enter(""); | |
199 | ||
200 | conn = kzalloc(sizeof(struct rxrpc_connection), gfp); | |
201 | if (conn) { | |
202 | INIT_WORK(&conn->processor, &rxrpc_process_connection); | |
203 | INIT_LIST_HEAD(&conn->bundle_link); | |
204 | conn->calls = RB_ROOT; | |
205 | skb_queue_head_init(&conn->rx_queue); | |
206 | rwlock_init(&conn->lock); | |
207 | spin_lock_init(&conn->state_lock); | |
208 | atomic_set(&conn->usage, 1); | |
209 | conn->debug_id = atomic_inc_return(&rxrpc_debug_id); | |
210 | conn->avail_calls = RXRPC_MAXCALLS; | |
211 | conn->size_align = 4; | |
212 | conn->header_size = sizeof(struct rxrpc_header); | |
213 | } | |
214 | ||
16c61add | 215 | _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0); |
17926a79 DH |
216 | return conn; |
217 | } | |
218 | ||
219 | /* | |
220 | * assign a connection ID to a connection and add it to the transport's | |
221 | * connection lookup tree | |
222 | * - called with transport client lock held | |
223 | */ | |
224 | static void rxrpc_assign_connection_id(struct rxrpc_connection *conn) | |
225 | { | |
226 | struct rxrpc_connection *xconn; | |
227 | struct rb_node *parent, **p; | |
228 | __be32 epoch; | |
229 | u32 real_conn_id; | |
230 | ||
231 | _enter(""); | |
232 | ||
233 | epoch = conn->epoch; | |
234 | ||
235 | write_lock_bh(&conn->trans->conn_lock); | |
236 | ||
237 | conn->trans->conn_idcounter += RXRPC_CID_INC; | |
238 | if (conn->trans->conn_idcounter < RXRPC_CID_INC) | |
239 | conn->trans->conn_idcounter = RXRPC_CID_INC; | |
240 | real_conn_id = conn->trans->conn_idcounter; | |
241 | ||
242 | attempt_insertion: | |
243 | parent = NULL; | |
244 | p = &conn->trans->client_conns.rb_node; | |
245 | ||
246 | while (*p) { | |
247 | parent = *p; | |
248 | xconn = rb_entry(parent, struct rxrpc_connection, node); | |
249 | ||
250 | if (epoch < xconn->epoch) | |
251 | p = &(*p)->rb_left; | |
252 | else if (epoch > xconn->epoch) | |
253 | p = &(*p)->rb_right; | |
254 | else if (real_conn_id < xconn->real_conn_id) | |
255 | p = &(*p)->rb_left; | |
256 | else if (real_conn_id > xconn->real_conn_id) | |
257 | p = &(*p)->rb_right; | |
258 | else | |
259 | goto id_exists; | |
260 | } | |
261 | ||
262 | /* we've found a suitable hole - arrange for this connection to occupy | |
263 | * it */ | |
264 | rb_link_node(&conn->node, parent, p); | |
265 | rb_insert_color(&conn->node, &conn->trans->client_conns); | |
266 | ||
267 | conn->real_conn_id = real_conn_id; | |
268 | conn->cid = htonl(real_conn_id); | |
269 | write_unlock_bh(&conn->trans->conn_lock); | |
270 | _leave(" [CONNID %x CID %x]", real_conn_id, ntohl(conn->cid)); | |
271 | return; | |
272 | ||
273 | /* we found a connection with the proposed ID - walk the tree from that | |
274 | * point looking for the next unused ID */ | |
275 | id_exists: | |
276 | for (;;) { | |
277 | real_conn_id += RXRPC_CID_INC; | |
278 | if (real_conn_id < RXRPC_CID_INC) { | |
279 | real_conn_id = RXRPC_CID_INC; | |
280 | conn->trans->conn_idcounter = real_conn_id; | |
281 | goto attempt_insertion; | |
282 | } | |
283 | ||
284 | parent = rb_next(parent); | |
285 | if (!parent) | |
286 | goto attempt_insertion; | |
287 | ||
288 | xconn = rb_entry(parent, struct rxrpc_connection, node); | |
289 | if (epoch < xconn->epoch || | |
290 | real_conn_id < xconn->real_conn_id) | |
291 | goto attempt_insertion; | |
292 | } | |
293 | } | |
294 | ||
295 | /* | |
296 | * add a call to a connection's call-by-ID tree | |
297 | */ | |
298 | static void rxrpc_add_call_ID_to_conn(struct rxrpc_connection *conn, | |
299 | struct rxrpc_call *call) | |
300 | { | |
301 | struct rxrpc_call *xcall; | |
302 | struct rb_node *parent, **p; | |
303 | __be32 call_id; | |
304 | ||
305 | write_lock_bh(&conn->lock); | |
306 | ||
307 | call_id = call->call_id; | |
308 | p = &conn->calls.rb_node; | |
309 | parent = NULL; | |
310 | while (*p) { | |
311 | parent = *p; | |
312 | xcall = rb_entry(parent, struct rxrpc_call, conn_node); | |
313 | ||
314 | if (call_id < xcall->call_id) | |
315 | p = &(*p)->rb_left; | |
316 | else if (call_id > xcall->call_id) | |
317 | p = &(*p)->rb_right; | |
318 | else | |
319 | BUG(); | |
320 | } | |
321 | ||
322 | rb_link_node(&call->conn_node, parent, p); | |
323 | rb_insert_color(&call->conn_node, &conn->calls); | |
324 | ||
325 | write_unlock_bh(&conn->lock); | |
326 | } | |
327 | ||
328 | /* | |
329 | * connect a call on an exclusive connection | |
330 | */ | |
331 | static int rxrpc_connect_exclusive(struct rxrpc_sock *rx, | |
332 | struct rxrpc_transport *trans, | |
333 | __be16 service_id, | |
334 | struct rxrpc_call *call, | |
335 | gfp_t gfp) | |
336 | { | |
337 | struct rxrpc_connection *conn; | |
338 | int chan, ret; | |
339 | ||
340 | _enter(""); | |
341 | ||
342 | conn = rx->conn; | |
343 | if (!conn) { | |
344 | /* not yet present - create a candidate for a new connection | |
345 | * and then redo the check */ | |
346 | conn = rxrpc_alloc_connection(gfp); | |
0975ecba DC |
347 | if (!conn) { |
348 | _leave(" = -ENOMEM"); | |
349 | return -ENOMEM; | |
17926a79 DH |
350 | } |
351 | ||
352 | conn->trans = trans; | |
353 | conn->bundle = NULL; | |
354 | conn->service_id = service_id; | |
355 | conn->epoch = rxrpc_epoch; | |
356 | conn->in_clientflag = 0; | |
357 | conn->out_clientflag = RXRPC_CLIENT_INITIATED; | |
358 | conn->cid = 0; | |
359 | conn->state = RXRPC_CONN_CLIENT; | |
651350d1 | 360 | conn->avail_calls = RXRPC_MAXCALLS - 1; |
17926a79 DH |
361 | conn->security_level = rx->min_sec_level; |
362 | conn->key = key_get(rx->key); | |
363 | ||
364 | ret = rxrpc_init_client_conn_security(conn); | |
365 | if (ret < 0) { | |
366 | key_put(conn->key); | |
367 | kfree(conn); | |
368 | _leave(" = %d [key]", ret); | |
369 | return ret; | |
370 | } | |
371 | ||
372 | write_lock_bh(&rxrpc_connection_lock); | |
373 | list_add_tail(&conn->link, &rxrpc_connections); | |
374 | write_unlock_bh(&rxrpc_connection_lock); | |
375 | ||
376 | spin_lock(&trans->client_lock); | |
377 | atomic_inc(&trans->usage); | |
378 | ||
379 | _net("CONNECT EXCL new %d on TRANS %d", | |
380 | conn->debug_id, conn->trans->debug_id); | |
381 | ||
382 | rxrpc_assign_connection_id(conn); | |
383 | rx->conn = conn; | |
384 | } | |
385 | ||
386 | /* we've got a connection with a free channel and we can now attach the | |
387 | * call to it | |
388 | * - we're holding the transport's client lock | |
389 | * - we're holding a reference on the connection | |
390 | */ | |
391 | for (chan = 0; chan < RXRPC_MAXCALLS; chan++) | |
392 | if (!conn->channels[chan]) | |
393 | goto found_channel; | |
394 | goto no_free_channels; | |
395 | ||
396 | found_channel: | |
397 | atomic_inc(&conn->usage); | |
398 | conn->channels[chan] = call; | |
399 | call->conn = conn; | |
400 | call->channel = chan; | |
401 | call->cid = conn->cid | htonl(chan); | |
402 | call->call_id = htonl(++conn->call_counter); | |
403 | ||
404 | _net("CONNECT client on conn %d chan %d as call %x", | |
405 | conn->debug_id, chan, ntohl(call->call_id)); | |
406 | ||
407 | spin_unlock(&trans->client_lock); | |
408 | ||
409 | rxrpc_add_call_ID_to_conn(conn, call); | |
410 | _leave(" = 0"); | |
411 | return 0; | |
412 | ||
413 | no_free_channels: | |
414 | spin_unlock(&trans->client_lock); | |
415 | _leave(" = -ENOSR"); | |
416 | return -ENOSR; | |
417 | } | |
418 | ||
419 | /* | |
420 | * find a connection for a call | |
421 | * - called in process context with IRQs enabled | |
422 | */ | |
423 | int rxrpc_connect_call(struct rxrpc_sock *rx, | |
424 | struct rxrpc_transport *trans, | |
425 | struct rxrpc_conn_bundle *bundle, | |
426 | struct rxrpc_call *call, | |
427 | gfp_t gfp) | |
428 | { | |
429 | struct rxrpc_connection *conn, *candidate; | |
430 | int chan, ret; | |
431 | ||
432 | DECLARE_WAITQUEUE(myself, current); | |
433 | ||
434 | _enter("%p,%lx,", rx, call->user_call_ID); | |
435 | ||
436 | if (test_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags)) | |
437 | return rxrpc_connect_exclusive(rx, trans, bundle->service_id, | |
438 | call, gfp); | |
439 | ||
440 | spin_lock(&trans->client_lock); | |
441 | for (;;) { | |
442 | /* see if the bundle has a call slot available */ | |
443 | if (!list_empty(&bundle->avail_conns)) { | |
444 | _debug("avail"); | |
445 | conn = list_entry(bundle->avail_conns.next, | |
446 | struct rxrpc_connection, | |
447 | bundle_link); | |
519d2567 DH |
448 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
449 | list_del_init(&conn->bundle_link); | |
450 | bundle->num_conns--; | |
451 | continue; | |
452 | } | |
17926a79 DH |
453 | if (--conn->avail_calls == 0) |
454 | list_move(&conn->bundle_link, | |
455 | &bundle->busy_conns); | |
651350d1 DH |
456 | ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS); |
457 | ASSERT(conn->channels[0] == NULL || | |
458 | conn->channels[1] == NULL || | |
459 | conn->channels[2] == NULL || | |
460 | conn->channels[3] == NULL); | |
17926a79 DH |
461 | atomic_inc(&conn->usage); |
462 | break; | |
463 | } | |
464 | ||
465 | if (!list_empty(&bundle->unused_conns)) { | |
466 | _debug("unused"); | |
467 | conn = list_entry(bundle->unused_conns.next, | |
468 | struct rxrpc_connection, | |
469 | bundle_link); | |
519d2567 DH |
470 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
471 | list_del_init(&conn->bundle_link); | |
472 | bundle->num_conns--; | |
473 | continue; | |
474 | } | |
651350d1 DH |
475 | ASSERTCMP(conn->avail_calls, ==, RXRPC_MAXCALLS); |
476 | conn->avail_calls = RXRPC_MAXCALLS - 1; | |
477 | ASSERT(conn->channels[0] == NULL && | |
478 | conn->channels[1] == NULL && | |
479 | conn->channels[2] == NULL && | |
480 | conn->channels[3] == NULL); | |
17926a79 DH |
481 | atomic_inc(&conn->usage); |
482 | list_move(&conn->bundle_link, &bundle->avail_conns); | |
483 | break; | |
484 | } | |
485 | ||
486 | /* need to allocate a new connection */ | |
487 | _debug("get new conn [%d]", bundle->num_conns); | |
488 | ||
489 | spin_unlock(&trans->client_lock); | |
490 | ||
491 | if (signal_pending(current)) | |
492 | goto interrupted; | |
493 | ||
494 | if (bundle->num_conns >= 20) { | |
495 | _debug("too many conns"); | |
496 | ||
497 | if (!(gfp & __GFP_WAIT)) { | |
498 | _leave(" = -EAGAIN"); | |
499 | return -EAGAIN; | |
500 | } | |
501 | ||
502 | add_wait_queue(&bundle->chanwait, &myself); | |
503 | for (;;) { | |
504 | set_current_state(TASK_INTERRUPTIBLE); | |
505 | if (bundle->num_conns < 20 || | |
506 | !list_empty(&bundle->unused_conns) || | |
507 | !list_empty(&bundle->avail_conns)) | |
508 | break; | |
509 | if (signal_pending(current)) | |
510 | goto interrupted_dequeue; | |
511 | schedule(); | |
512 | } | |
513 | remove_wait_queue(&bundle->chanwait, &myself); | |
514 | __set_current_state(TASK_RUNNING); | |
515 | spin_lock(&trans->client_lock); | |
516 | continue; | |
517 | } | |
518 | ||
519 | /* not yet present - create a candidate for a new connection and then | |
520 | * redo the check */ | |
521 | candidate = rxrpc_alloc_connection(gfp); | |
0975ecba DC |
522 | if (!candidate) { |
523 | _leave(" = -ENOMEM"); | |
524 | return -ENOMEM; | |
17926a79 DH |
525 | } |
526 | ||
527 | candidate->trans = trans; | |
528 | candidate->bundle = bundle; | |
529 | candidate->service_id = bundle->service_id; | |
530 | candidate->epoch = rxrpc_epoch; | |
531 | candidate->in_clientflag = 0; | |
532 | candidate->out_clientflag = RXRPC_CLIENT_INITIATED; | |
533 | candidate->cid = 0; | |
534 | candidate->state = RXRPC_CONN_CLIENT; | |
535 | candidate->avail_calls = RXRPC_MAXCALLS; | |
536 | candidate->security_level = rx->min_sec_level; | |
651350d1 | 537 | candidate->key = key_get(bundle->key); |
17926a79 DH |
538 | |
539 | ret = rxrpc_init_client_conn_security(candidate); | |
540 | if (ret < 0) { | |
541 | key_put(candidate->key); | |
542 | kfree(candidate); | |
543 | _leave(" = %d [key]", ret); | |
544 | return ret; | |
545 | } | |
546 | ||
547 | write_lock_bh(&rxrpc_connection_lock); | |
548 | list_add_tail(&candidate->link, &rxrpc_connections); | |
549 | write_unlock_bh(&rxrpc_connection_lock); | |
550 | ||
551 | spin_lock(&trans->client_lock); | |
552 | ||
553 | list_add(&candidate->bundle_link, &bundle->unused_conns); | |
554 | bundle->num_conns++; | |
555 | atomic_inc(&bundle->usage); | |
556 | atomic_inc(&trans->usage); | |
557 | ||
558 | _net("CONNECT new %d on TRANS %d", | |
559 | candidate->debug_id, candidate->trans->debug_id); | |
560 | ||
561 | rxrpc_assign_connection_id(candidate); | |
562 | if (candidate->security) | |
563 | candidate->security->prime_packet_security(candidate); | |
564 | ||
565 | /* leave the candidate lurking in zombie mode attached to the | |
566 | * bundle until we're ready for it */ | |
567 | rxrpc_put_connection(candidate); | |
568 | candidate = NULL; | |
569 | } | |
570 | ||
571 | /* we've got a connection with a free channel and we can now attach the | |
572 | * call to it | |
573 | * - we're holding the transport's client lock | |
574 | * - we're holding a reference on the connection | |
575 | * - we're holding a reference on the bundle | |
576 | */ | |
577 | for (chan = 0; chan < RXRPC_MAXCALLS; chan++) | |
578 | if (!conn->channels[chan]) | |
579 | goto found_channel; | |
651350d1 DH |
580 | ASSERT(conn->channels[0] == NULL || |
581 | conn->channels[1] == NULL || | |
582 | conn->channels[2] == NULL || | |
583 | conn->channels[3] == NULL); | |
17926a79 DH |
584 | BUG(); |
585 | ||
586 | found_channel: | |
587 | conn->channels[chan] = call; | |
588 | call->conn = conn; | |
589 | call->channel = chan; | |
590 | call->cid = conn->cid | htonl(chan); | |
591 | call->call_id = htonl(++conn->call_counter); | |
592 | ||
593 | _net("CONNECT client on conn %d chan %d as call %x", | |
594 | conn->debug_id, chan, ntohl(call->call_id)); | |
595 | ||
651350d1 | 596 | ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS); |
17926a79 DH |
597 | spin_unlock(&trans->client_lock); |
598 | ||
599 | rxrpc_add_call_ID_to_conn(conn, call); | |
600 | ||
601 | _leave(" = 0"); | |
602 | return 0; | |
603 | ||
604 | interrupted_dequeue: | |
605 | remove_wait_queue(&bundle->chanwait, &myself); | |
606 | __set_current_state(TASK_RUNNING); | |
607 | interrupted: | |
608 | _leave(" = -ERESTARTSYS"); | |
609 | return -ERESTARTSYS; | |
610 | } | |
611 | ||
612 | /* | |
613 | * get a record of an incoming connection | |
614 | */ | |
615 | struct rxrpc_connection * | |
616 | rxrpc_incoming_connection(struct rxrpc_transport *trans, | |
617 | struct rxrpc_header *hdr, | |
618 | gfp_t gfp) | |
619 | { | |
620 | struct rxrpc_connection *conn, *candidate = NULL; | |
621 | struct rb_node *p, **pp; | |
622 | const char *new = "old"; | |
623 | __be32 epoch; | |
624 | u32 conn_id; | |
625 | ||
626 | _enter(""); | |
627 | ||
628 | ASSERT(hdr->flags & RXRPC_CLIENT_INITIATED); | |
629 | ||
630 | epoch = hdr->epoch; | |
631 | conn_id = ntohl(hdr->cid) & RXRPC_CIDMASK; | |
632 | ||
633 | /* search the connection list first */ | |
634 | read_lock_bh(&trans->conn_lock); | |
635 | ||
636 | p = trans->server_conns.rb_node; | |
637 | while (p) { | |
638 | conn = rb_entry(p, struct rxrpc_connection, node); | |
639 | ||
640 | _debug("maybe %x", conn->real_conn_id); | |
641 | ||
642 | if (epoch < conn->epoch) | |
643 | p = p->rb_left; | |
644 | else if (epoch > conn->epoch) | |
645 | p = p->rb_right; | |
646 | else if (conn_id < conn->real_conn_id) | |
647 | p = p->rb_left; | |
648 | else if (conn_id > conn->real_conn_id) | |
649 | p = p->rb_right; | |
650 | else | |
651 | goto found_extant_connection; | |
652 | } | |
653 | read_unlock_bh(&trans->conn_lock); | |
654 | ||
655 | /* not yet present - create a candidate for a new record and then | |
656 | * redo the search */ | |
657 | candidate = rxrpc_alloc_connection(gfp); | |
658 | if (!candidate) { | |
659 | _leave(" = -ENOMEM"); | |
660 | return ERR_PTR(-ENOMEM); | |
661 | } | |
662 | ||
663 | candidate->trans = trans; | |
664 | candidate->epoch = hdr->epoch; | |
ae445d17 | 665 | candidate->cid = hdr->cid & cpu_to_be32(RXRPC_CIDMASK); |
17926a79 DH |
666 | candidate->service_id = hdr->serviceId; |
667 | candidate->security_ix = hdr->securityIndex; | |
668 | candidate->in_clientflag = RXRPC_CLIENT_INITIATED; | |
669 | candidate->out_clientflag = 0; | |
670 | candidate->real_conn_id = conn_id; | |
671 | candidate->state = RXRPC_CONN_SERVER; | |
672 | if (candidate->service_id) | |
673 | candidate->state = RXRPC_CONN_SERVER_UNSECURED; | |
674 | ||
675 | write_lock_bh(&trans->conn_lock); | |
676 | ||
677 | pp = &trans->server_conns.rb_node; | |
678 | p = NULL; | |
679 | while (*pp) { | |
680 | p = *pp; | |
681 | conn = rb_entry(p, struct rxrpc_connection, node); | |
682 | ||
683 | if (epoch < conn->epoch) | |
684 | pp = &(*pp)->rb_left; | |
685 | else if (epoch > conn->epoch) | |
686 | pp = &(*pp)->rb_right; | |
687 | else if (conn_id < conn->real_conn_id) | |
688 | pp = &(*pp)->rb_left; | |
689 | else if (conn_id > conn->real_conn_id) | |
690 | pp = &(*pp)->rb_right; | |
691 | else | |
692 | goto found_extant_second; | |
693 | } | |
694 | ||
695 | /* we can now add the new candidate to the list */ | |
696 | conn = candidate; | |
697 | candidate = NULL; | |
698 | rb_link_node(&conn->node, p, pp); | |
699 | rb_insert_color(&conn->node, &trans->server_conns); | |
700 | atomic_inc(&conn->trans->usage); | |
701 | ||
702 | write_unlock_bh(&trans->conn_lock); | |
703 | ||
704 | write_lock_bh(&rxrpc_connection_lock); | |
705 | list_add_tail(&conn->link, &rxrpc_connections); | |
706 | write_unlock_bh(&rxrpc_connection_lock); | |
707 | ||
708 | new = "new"; | |
709 | ||
710 | success: | |
711 | _net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->real_conn_id); | |
712 | ||
713 | _leave(" = %p {u=%d}", conn, atomic_read(&conn->usage)); | |
714 | return conn; | |
715 | ||
716 | /* we found the connection in the list immediately */ | |
717 | found_extant_connection: | |
718 | if (hdr->securityIndex != conn->security_ix) { | |
719 | read_unlock_bh(&trans->conn_lock); | |
720 | goto security_mismatch; | |
721 | } | |
722 | atomic_inc(&conn->usage); | |
723 | read_unlock_bh(&trans->conn_lock); | |
724 | goto success; | |
725 | ||
726 | /* we found the connection on the second time through the list */ | |
727 | found_extant_second: | |
728 | if (hdr->securityIndex != conn->security_ix) { | |
729 | write_unlock_bh(&trans->conn_lock); | |
730 | goto security_mismatch; | |
731 | } | |
732 | atomic_inc(&conn->usage); | |
733 | write_unlock_bh(&trans->conn_lock); | |
734 | kfree(candidate); | |
735 | goto success; | |
736 | ||
737 | security_mismatch: | |
738 | kfree(candidate); | |
739 | _leave(" = -EKEYREJECTED"); | |
740 | return ERR_PTR(-EKEYREJECTED); | |
741 | } | |
742 | ||
743 | /* | |
744 | * find a connection based on transport and RxRPC connection ID for an incoming | |
745 | * packet | |
746 | */ | |
747 | struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans, | |
748 | struct rxrpc_header *hdr) | |
749 | { | |
750 | struct rxrpc_connection *conn; | |
751 | struct rb_node *p; | |
752 | __be32 epoch; | |
753 | u32 conn_id; | |
754 | ||
755 | _enter(",{%x,%x}", ntohl(hdr->cid), hdr->flags); | |
756 | ||
757 | read_lock_bh(&trans->conn_lock); | |
758 | ||
759 | conn_id = ntohl(hdr->cid) & RXRPC_CIDMASK; | |
760 | epoch = hdr->epoch; | |
761 | ||
762 | if (hdr->flags & RXRPC_CLIENT_INITIATED) | |
763 | p = trans->server_conns.rb_node; | |
764 | else | |
765 | p = trans->client_conns.rb_node; | |
766 | ||
767 | while (p) { | |
768 | conn = rb_entry(p, struct rxrpc_connection, node); | |
769 | ||
770 | _debug("maybe %x", conn->real_conn_id); | |
771 | ||
772 | if (epoch < conn->epoch) | |
773 | p = p->rb_left; | |
774 | else if (epoch > conn->epoch) | |
775 | p = p->rb_right; | |
776 | else if (conn_id < conn->real_conn_id) | |
777 | p = p->rb_left; | |
778 | else if (conn_id > conn->real_conn_id) | |
779 | p = p->rb_right; | |
780 | else | |
781 | goto found; | |
782 | } | |
783 | ||
784 | read_unlock_bh(&trans->conn_lock); | |
785 | _leave(" = NULL"); | |
786 | return NULL; | |
787 | ||
788 | found: | |
789 | atomic_inc(&conn->usage); | |
790 | read_unlock_bh(&trans->conn_lock); | |
791 | _leave(" = %p", conn); | |
792 | return conn; | |
793 | } | |
794 | ||
795 | /* | |
796 | * release a virtual connection | |
797 | */ | |
798 | void rxrpc_put_connection(struct rxrpc_connection *conn) | |
799 | { | |
800 | _enter("%p{u=%d,d=%d}", | |
801 | conn, atomic_read(&conn->usage), conn->debug_id); | |
802 | ||
803 | ASSERTCMP(atomic_read(&conn->usage), >, 0); | |
804 | ||
2c6b47de | 805 | conn->put_time = get_seconds(); |
17926a79 DH |
806 | if (atomic_dec_and_test(&conn->usage)) { |
807 | _debug("zombie"); | |
651350d1 | 808 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
17926a79 DH |
809 | } |
810 | ||
811 | _leave(""); | |
812 | } | |
813 | ||
814 | /* | |
815 | * destroy a virtual connection | |
816 | */ | |
817 | static void rxrpc_destroy_connection(struct rxrpc_connection *conn) | |
818 | { | |
819 | _enter("%p{%d}", conn, atomic_read(&conn->usage)); | |
820 | ||
821 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); | |
822 | ||
823 | _net("DESTROY CONN %d", conn->debug_id); | |
824 | ||
825 | if (conn->bundle) | |
826 | rxrpc_put_bundle(conn->trans, conn->bundle); | |
827 | ||
828 | ASSERT(RB_EMPTY_ROOT(&conn->calls)); | |
829 | rxrpc_purge_queue(&conn->rx_queue); | |
830 | ||
831 | rxrpc_clear_conn_security(conn); | |
832 | rxrpc_put_transport(conn->trans); | |
833 | kfree(conn); | |
834 | _leave(""); | |
835 | } | |
836 | ||
837 | /* | |
838 | * reap dead connections | |
839 | */ | |
5eaa65b2 | 840 | static void rxrpc_connection_reaper(struct work_struct *work) |
17926a79 DH |
841 | { |
842 | struct rxrpc_connection *conn, *_p; | |
843 | unsigned long now, earliest, reap_time; | |
844 | ||
845 | LIST_HEAD(graveyard); | |
846 | ||
847 | _enter(""); | |
848 | ||
2c6b47de | 849 | now = get_seconds(); |
17926a79 DH |
850 | earliest = ULONG_MAX; |
851 | ||
852 | write_lock_bh(&rxrpc_connection_lock); | |
853 | list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) { | |
854 | _debug("reap CONN %d { u=%d,t=%ld }", | |
855 | conn->debug_id, atomic_read(&conn->usage), | |
856 | (long) now - (long) conn->put_time); | |
857 | ||
858 | if (likely(atomic_read(&conn->usage) > 0)) | |
859 | continue; | |
860 | ||
861 | spin_lock(&conn->trans->client_lock); | |
862 | write_lock(&conn->trans->conn_lock); | |
863 | reap_time = conn->put_time + rxrpc_connection_timeout; | |
864 | ||
865 | if (atomic_read(&conn->usage) > 0) { | |
866 | ; | |
867 | } else if (reap_time <= now) { | |
868 | list_move_tail(&conn->link, &graveyard); | |
869 | if (conn->out_clientflag) | |
870 | rb_erase(&conn->node, | |
871 | &conn->trans->client_conns); | |
872 | else | |
873 | rb_erase(&conn->node, | |
874 | &conn->trans->server_conns); | |
875 | if (conn->bundle) { | |
876 | list_del_init(&conn->bundle_link); | |
877 | conn->bundle->num_conns--; | |
878 | } | |
879 | ||
880 | } else if (reap_time < earliest) { | |
881 | earliest = reap_time; | |
882 | } | |
883 | ||
884 | write_unlock(&conn->trans->conn_lock); | |
885 | spin_unlock(&conn->trans->client_lock); | |
886 | } | |
887 | write_unlock_bh(&rxrpc_connection_lock); | |
888 | ||
889 | if (earliest != ULONG_MAX) { | |
890 | _debug("reschedule reaper %ld", (long) earliest - now); | |
891 | ASSERTCMP(earliest, >, now); | |
651350d1 DH |
892 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, |
893 | (earliest - now) * HZ); | |
17926a79 DH |
894 | } |
895 | ||
896 | /* then destroy all those pulled out */ | |
897 | while (!list_empty(&graveyard)) { | |
898 | conn = list_entry(graveyard.next, struct rxrpc_connection, | |
899 | link); | |
900 | list_del_init(&conn->link); | |
901 | ||
902 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); | |
903 | rxrpc_destroy_connection(conn); | |
904 | } | |
905 | ||
906 | _leave(""); | |
907 | } | |
908 | ||
909 | /* | |
910 | * preemptively destroy all the connection records rather than waiting for them | |
911 | * to time out | |
912 | */ | |
913 | void __exit rxrpc_destroy_all_connections(void) | |
914 | { | |
915 | _enter(""); | |
916 | ||
917 | rxrpc_connection_timeout = 0; | |
918 | cancel_delayed_work(&rxrpc_connection_reap); | |
651350d1 | 919 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
17926a79 DH |
920 | |
921 | _leave(""); | |
922 | } |