Commit | Line | Data |
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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 | ||
5873c083 DH |
21 | /* |
22 | * Time till a connection expires after last use (in seconds). | |
23 | */ | |
24 | unsigned rxrpc_connection_expiry = 10 * 60; | |
25 | ||
17926a79 DH |
26 | static void rxrpc_connection_reaper(struct work_struct *work); |
27 | ||
28 | LIST_HEAD(rxrpc_connections); | |
29 | DEFINE_RWLOCK(rxrpc_connection_lock); | |
17926a79 DH |
30 | static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper); |
31 | ||
32 | /* | |
33 | * allocate a new client connection bundle | |
34 | */ | |
35 | static 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 | * compare bundle parameters with what we're looking for | |
56 | * - return -ve, 0 or +ve | |
57 | */ | |
58 | static inline | |
59 | int 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 | * get bundle of client connections that a client socket can make use of | |
68 | */ | |
69 | struct 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,", | |
582ee43d | 79 | rx, key_serial(key), trans->debug_id, ntohs(service_id)); |
17926a79 DH |
80 | |
81 | if (rx->trans == trans && rx->bundle) { | |
82 | atomic_inc(&rx->bundle->usage); | |
83 | return rx->bundle; | |
84 | } | |
85 | ||
86 | /* search the extant bundles first for one that matches the specified | |
87 | * user ID */ | |
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 | /* not yet present - create a candidate for a new record and then | |
105 | * redo the search */ | |
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 | /* second search also failed; add the new bundle */ | |
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 | /* we found the bundle in the list immediately */ | |
147 | found_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 | /* we found the bundle on the second time through the list */ | |
159 | found_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 | * release a bundle | |
174 | */ | |
175 | void 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 | * allocate a new connection | |
197 | */ | |
198 | static 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 | ||
16c61add | 219 | _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0); |
17926a79 DH |
220 | return conn; |
221 | } | |
222 | ||
223 | /* | |
224 | * assign a connection ID to a connection and add it to the transport's | |
225 | * connection lookup tree | |
226 | * - called with transport client lock held | |
227 | */ | |
228 | static 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 | ||
246 | attempt_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 | /* we've found a suitable hole - arrange for this connection to occupy | |
267 | * it */ | |
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 | /* we found a connection with the proposed ID - walk the tree from that | |
278 | * point looking for the next unused ID */ | |
279 | id_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 | * add a call to a connection's call-by-ID tree | |
301 | */ | |
302 | static 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 | * connect a call on an exclusive connection | |
334 | */ | |
335 | static 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 | /* not yet present - create a candidate for a new connection | |
349 | * and then redo the check */ | |
350 | conn = rxrpc_alloc_connection(gfp); | |
0975ecba DC |
351 | if (!conn) { |
352 | _leave(" = -ENOMEM"); | |
353 | return -ENOMEM; | |
17926a79 DH |
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; | |
651350d1 | 364 | conn->avail_calls = RXRPC_MAXCALLS - 1; |
17926a79 DH |
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; | |
8f22ba61 AK |
388 | } else { |
389 | spin_lock(&trans->client_lock); | |
17926a79 DH |
390 | } |
391 | ||
392 | /* we've got a connection with a free channel and we can now attach the | |
393 | * call to it | |
394 | * - we're holding the transport's client lock | |
395 | * - we're holding a reference on the connection | |
396 | */ | |
397 | for (chan = 0; chan < RXRPC_MAXCALLS; chan++) | |
398 | if (!conn->channels[chan]) | |
399 | goto found_channel; | |
400 | goto no_free_channels; | |
401 | ||
402 | found_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 | ||
419 | no_free_channels: | |
420 | spin_unlock(&trans->client_lock); | |
421 | _leave(" = -ENOSR"); | |
422 | return -ENOSR; | |
423 | } | |
424 | ||
425 | /* | |
426 | * find a connection for a call | |
427 | * - called in process context with IRQs enabled | |
428 | */ | |
429 | int 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 | /* see if the bundle has a call slot available */ | |
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); | |
519d2567 DH |
454 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
455 | list_del_init(&conn->bundle_link); | |
456 | bundle->num_conns--; | |
457 | continue; | |
458 | } | |
17926a79 DH |
459 | if (--conn->avail_calls == 0) |
460 | list_move(&conn->bundle_link, | |
461 | &bundle->busy_conns); | |
651350d1 DH |
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); | |
17926a79 DH |
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); | |
519d2567 DH |
476 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
477 | list_del_init(&conn->bundle_link); | |
478 | bundle->num_conns--; | |
479 | continue; | |
480 | } | |
651350d1 DH |
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); | |
17926a79 DH |
487 | atomic_inc(&conn->usage); |
488 | list_move(&conn->bundle_link, &bundle->avail_conns); | |
489 | break; | |
490 | } | |
491 | ||
492 | /* need to allocate a new connection */ | |
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 | /* not yet present - create a candidate for a new connection and then | |
526 | * redo the check */ | |
527 | candidate = rxrpc_alloc_connection(gfp); | |
0975ecba DC |
528 | if (!candidate) { |
529 | _leave(" = -ENOMEM"); | |
530 | return -ENOMEM; | |
17926a79 DH |
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; | |
651350d1 | 543 | candidate->key = key_get(bundle->key); |
17926a79 DH |
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 | /* leave the candidate lurking in zombie mode attached to the | |
572 | * bundle until we're ready for it */ | |
573 | rxrpc_put_connection(candidate); | |
574 | candidate = NULL; | |
575 | } | |
576 | ||
577 | /* we've got a connection with a free channel and we can now attach the | |
578 | * call to it | |
579 | * - we're holding the transport's client lock | |
580 | * - we're holding a reference on the connection | |
581 | * - we're holding a reference on the bundle | |
582 | */ | |
583 | for (chan = 0; chan < RXRPC_MAXCALLS; chan++) | |
584 | if (!conn->channels[chan]) | |
585 | goto found_channel; | |
651350d1 DH |
586 | ASSERT(conn->channels[0] == NULL || |
587 | conn->channels[1] == NULL || | |
588 | conn->channels[2] == NULL || | |
589 | conn->channels[3] == NULL); | |
17926a79 DH |
590 | BUG(); |
591 | ||
592 | found_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 | ||
651350d1 | 602 | ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS); |
17926a79 DH |
603 | spin_unlock(&trans->client_lock); |
604 | ||
605 | rxrpc_add_call_ID_to_conn(conn, call); | |
606 | ||
607 | _leave(" = 0"); | |
608 | return 0; | |
609 | ||
610 | interrupted_dequeue: | |
611 | remove_wait_queue(&bundle->chanwait, &myself); | |
612 | __set_current_state(TASK_RUNNING); | |
613 | interrupted: | |
614 | _leave(" = -ERESTARTSYS"); | |
615 | return -ERESTARTSYS; | |
616 | } | |
617 | ||
618 | /* | |
619 | * get a record of an incoming connection | |
620 | */ | |
621 | struct rxrpc_connection * | |
622 | rxrpc_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 | /* search the connection list first */ | |
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 | /* not yet present - create a candidate for a new record and then | |
662 | * redo the search */ | |
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; | |
ae445d17 | 671 | candidate->cid = hdr->cid & cpu_to_be32(RXRPC_CIDMASK); |
17926a79 DH |
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 | /* we can now add the new candidate to the list */ | |
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 | ||
716 | success: | |
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 | /* we found the connection in the list immediately */ | |
723 | found_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 | /* we found the connection on the second time through the list */ | |
733 | found_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 | ||
743 | security_mismatch: | |
744 | kfree(candidate); | |
745 | _leave(" = -EKEYREJECTED"); | |
746 | return ERR_PTR(-EKEYREJECTED); | |
747 | } | |
748 | ||
749 | /* | |
750 | * find a connection based on transport and RxRPC connection ID for an incoming | |
751 | * packet | |
752 | */ | |
753 | struct 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 | ||
794 | found: | |
795 | atomic_inc(&conn->usage); | |
796 | read_unlock_bh(&trans->conn_lock); | |
797 | _leave(" = %p", conn); | |
798 | return conn; | |
799 | } | |
800 | ||
801 | /* | |
802 | * release a virtual connection | |
803 | */ | |
804 | void 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 | ||
2c6b47de | 811 | conn->put_time = get_seconds(); |
17926a79 DH |
812 | if (atomic_dec_and_test(&conn->usage)) { |
813 | _debug("zombie"); | |
651350d1 | 814 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
17926a79 DH |
815 | } |
816 | ||
817 | _leave(""); | |
818 | } | |
819 | ||
820 | /* | |
821 | * destroy a virtual connection | |
822 | */ | |
823 | static 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 | * reap dead connections | |
845 | */ | |
5eaa65b2 | 846 | static void rxrpc_connection_reaper(struct work_struct *work) |
17926a79 DH |
847 | { |
848 | struct rxrpc_connection *conn, *_p; | |
849 | unsigned long now, earliest, reap_time; | |
850 | ||
851 | LIST_HEAD(graveyard); | |
852 | ||
853 | _enter(""); | |
854 | ||
2c6b47de | 855 | now = get_seconds(); |
17926a79 DH |
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); | |
5873c083 | 869 | reap_time = conn->put_time + rxrpc_connection_expiry; |
17926a79 DH |
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); | |
651350d1 DH |
898 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, |
899 | (earliest - now) * HZ); | |
17926a79 DH |
900 | } |
901 | ||
902 | /* then destroy all those pulled out */ | |
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 | * preemptively destroy all the connection records rather than waiting for them | |
917 | * to time out | |
918 | */ | |
919 | void __exit rxrpc_destroy_all_connections(void) | |
920 | { | |
921 | _enter(""); | |
922 | ||
5873c083 | 923 | rxrpc_connection_expiry = 0; |
17926a79 | 924 | cancel_delayed_work(&rxrpc_connection_reap); |
651350d1 | 925 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
17926a79 DH |
926 | |
927 | _leave(""); | |
928 | } |