Commit | Line | Data |
---|---|---|
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 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 | 14 | #include <linux/module.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
17926a79 DH |
16 | #include <linux/net.h> |
17 | #include <linux/skbuff.h> | |
18 | #include <linux/crypto.h> | |
19 | #include <net/sock.h> | |
20 | #include <net/af_rxrpc.h> | |
21 | #include "ar-internal.h" | |
22 | ||
5873c083 DH |
23 | /* |
24 | * Time till a connection expires after last use (in seconds). | |
25 | */ | |
dad8aff7 | 26 | unsigned int rxrpc_connection_expiry = 10 * 60; |
5873c083 | 27 | |
17926a79 DH |
28 | static void rxrpc_connection_reaper(struct work_struct *work); |
29 | ||
30 | LIST_HEAD(rxrpc_connections); | |
31 | DEFINE_RWLOCK(rxrpc_connection_lock); | |
17926a79 DH |
32 | static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper); |
33 | ||
34 | /* | |
35 | * allocate a new client connection bundle | |
36 | */ | |
37 | static struct rxrpc_conn_bundle *rxrpc_alloc_bundle(gfp_t gfp) | |
38 | { | |
39 | struct rxrpc_conn_bundle *bundle; | |
40 | ||
41 | _enter(""); | |
42 | ||
43 | bundle = kzalloc(sizeof(struct rxrpc_conn_bundle), gfp); | |
44 | if (bundle) { | |
45 | INIT_LIST_HEAD(&bundle->unused_conns); | |
46 | INIT_LIST_HEAD(&bundle->avail_conns); | |
47 | INIT_LIST_HEAD(&bundle->busy_conns); | |
48 | init_waitqueue_head(&bundle->chanwait); | |
49 | atomic_set(&bundle->usage, 1); | |
50 | } | |
51 | ||
52 | _leave(" = %p", bundle); | |
53 | return bundle; | |
54 | } | |
55 | ||
56 | /* | |
57 | * compare bundle parameters with what we're looking for | |
58 | * - return -ve, 0 or +ve | |
59 | */ | |
60 | static inline | |
61 | int rxrpc_cmp_bundle(const struct rxrpc_conn_bundle *bundle, | |
0d12f8a4 | 62 | struct key *key, u16 service_id) |
17926a79 DH |
63 | { |
64 | return (bundle->service_id - service_id) ?: | |
0d12f8a4 | 65 | ((unsigned long)bundle->key - (unsigned long)key); |
17926a79 DH |
66 | } |
67 | ||
68 | /* | |
69 | * get bundle of client connections that a client socket can make use of | |
70 | */ | |
71 | struct rxrpc_conn_bundle *rxrpc_get_bundle(struct rxrpc_sock *rx, | |
72 | struct rxrpc_transport *trans, | |
73 | struct key *key, | |
0d12f8a4 | 74 | u16 service_id, |
17926a79 DH |
75 | gfp_t gfp) |
76 | { | |
77 | struct rxrpc_conn_bundle *bundle, *candidate; | |
78 | struct rb_node *p, *parent, **pp; | |
79 | ||
80 | _enter("%p{%x},%x,%hx,", | |
0d12f8a4 | 81 | rx, key_serial(key), trans->debug_id, service_id); |
17926a79 | 82 | |
17926a79 DH |
83 | /* search the extant bundles first for one that matches the specified |
84 | * user ID */ | |
85 | spin_lock(&trans->client_lock); | |
86 | ||
87 | p = trans->bundles.rb_node; | |
88 | while (p) { | |
89 | bundle = rb_entry(p, struct rxrpc_conn_bundle, node); | |
90 | ||
91 | if (rxrpc_cmp_bundle(bundle, key, service_id) < 0) | |
92 | p = p->rb_left; | |
93 | else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0) | |
94 | p = p->rb_right; | |
95 | else | |
96 | goto found_extant_bundle; | |
97 | } | |
98 | ||
99 | spin_unlock(&trans->client_lock); | |
100 | ||
101 | /* not yet present - create a candidate for a new record and then | |
102 | * redo the search */ | |
103 | candidate = rxrpc_alloc_bundle(gfp); | |
104 | if (!candidate) { | |
105 | _leave(" = -ENOMEM"); | |
106 | return ERR_PTR(-ENOMEM); | |
107 | } | |
108 | ||
109 | candidate->key = key_get(key); | |
110 | candidate->service_id = service_id; | |
111 | ||
112 | spin_lock(&trans->client_lock); | |
113 | ||
114 | pp = &trans->bundles.rb_node; | |
115 | parent = NULL; | |
116 | while (*pp) { | |
117 | parent = *pp; | |
118 | bundle = rb_entry(parent, struct rxrpc_conn_bundle, node); | |
119 | ||
120 | if (rxrpc_cmp_bundle(bundle, key, service_id) < 0) | |
121 | pp = &(*pp)->rb_left; | |
122 | else if (rxrpc_cmp_bundle(bundle, key, service_id) > 0) | |
123 | pp = &(*pp)->rb_right; | |
124 | else | |
125 | goto found_extant_second; | |
126 | } | |
127 | ||
128 | /* second search also failed; add the new bundle */ | |
129 | bundle = candidate; | |
130 | candidate = NULL; | |
131 | ||
132 | rb_link_node(&bundle->node, parent, pp); | |
133 | rb_insert_color(&bundle->node, &trans->bundles); | |
134 | spin_unlock(&trans->client_lock); | |
135 | _net("BUNDLE new on trans %d", trans->debug_id); | |
17926a79 DH |
136 | _leave(" = %p [new]", bundle); |
137 | return bundle; | |
138 | ||
139 | /* we found the bundle in the list immediately */ | |
140 | found_extant_bundle: | |
141 | atomic_inc(&bundle->usage); | |
142 | spin_unlock(&trans->client_lock); | |
143 | _net("BUNDLE old on trans %d", trans->debug_id); | |
17926a79 DH |
144 | _leave(" = %p [extant %d]", bundle, atomic_read(&bundle->usage)); |
145 | return bundle; | |
146 | ||
147 | /* we found the bundle on the second time through the list */ | |
148 | found_extant_second: | |
149 | atomic_inc(&bundle->usage); | |
150 | spin_unlock(&trans->client_lock); | |
151 | kfree(candidate); | |
152 | _net("BUNDLE old2 on trans %d", trans->debug_id); | |
17926a79 DH |
153 | _leave(" = %p [second %d]", bundle, atomic_read(&bundle->usage)); |
154 | return bundle; | |
155 | } | |
156 | ||
157 | /* | |
158 | * release a bundle | |
159 | */ | |
160 | void rxrpc_put_bundle(struct rxrpc_transport *trans, | |
161 | struct rxrpc_conn_bundle *bundle) | |
162 | { | |
163 | _enter("%p,%p{%d}",trans, bundle, atomic_read(&bundle->usage)); | |
164 | ||
165 | if (atomic_dec_and_lock(&bundle->usage, &trans->client_lock)) { | |
166 | _debug("Destroy bundle"); | |
167 | rb_erase(&bundle->node, &trans->bundles); | |
168 | spin_unlock(&trans->client_lock); | |
169 | ASSERT(list_empty(&bundle->unused_conns)); | |
170 | ASSERT(list_empty(&bundle->avail_conns)); | |
171 | ASSERT(list_empty(&bundle->busy_conns)); | |
172 | ASSERTCMP(bundle->num_conns, ==, 0); | |
173 | key_put(bundle->key); | |
174 | kfree(bundle); | |
175 | } | |
176 | ||
177 | _leave(""); | |
178 | } | |
179 | ||
180 | /* | |
181 | * allocate a new connection | |
182 | */ | |
183 | static struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp) | |
184 | { | |
185 | struct rxrpc_connection *conn; | |
186 | ||
187 | _enter(""); | |
188 | ||
189 | conn = kzalloc(sizeof(struct rxrpc_connection), gfp); | |
190 | if (conn) { | |
191 | INIT_WORK(&conn->processor, &rxrpc_process_connection); | |
192 | INIT_LIST_HEAD(&conn->bundle_link); | |
193 | conn->calls = RB_ROOT; | |
194 | skb_queue_head_init(&conn->rx_queue); | |
e0e4d82f | 195 | conn->security = &rxrpc_no_security; |
17926a79 DH |
196 | rwlock_init(&conn->lock); |
197 | spin_lock_init(&conn->state_lock); | |
198 | atomic_set(&conn->usage, 1); | |
199 | conn->debug_id = atomic_inc_return(&rxrpc_debug_id); | |
200 | conn->avail_calls = RXRPC_MAXCALLS; | |
201 | conn->size_align = 4; | |
0d12f8a4 | 202 | conn->header_size = sizeof(struct rxrpc_wire_header); |
17926a79 DH |
203 | } |
204 | ||
16c61add | 205 | _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0); |
17926a79 DH |
206 | return conn; |
207 | } | |
208 | ||
209 | /* | |
210 | * assign a connection ID to a connection and add it to the transport's | |
211 | * connection lookup tree | |
212 | * - called with transport client lock held | |
213 | */ | |
214 | static void rxrpc_assign_connection_id(struct rxrpc_connection *conn) | |
215 | { | |
216 | struct rxrpc_connection *xconn; | |
217 | struct rb_node *parent, **p; | |
218 | __be32 epoch; | |
0d12f8a4 | 219 | u32 cid; |
17926a79 DH |
220 | |
221 | _enter(""); | |
222 | ||
223 | epoch = conn->epoch; | |
224 | ||
225 | write_lock_bh(&conn->trans->conn_lock); | |
226 | ||
227 | conn->trans->conn_idcounter += RXRPC_CID_INC; | |
228 | if (conn->trans->conn_idcounter < RXRPC_CID_INC) | |
229 | conn->trans->conn_idcounter = RXRPC_CID_INC; | |
0d12f8a4 | 230 | cid = conn->trans->conn_idcounter; |
17926a79 DH |
231 | |
232 | attempt_insertion: | |
233 | parent = NULL; | |
234 | p = &conn->trans->client_conns.rb_node; | |
235 | ||
236 | while (*p) { | |
237 | parent = *p; | |
238 | xconn = rb_entry(parent, struct rxrpc_connection, node); | |
239 | ||
240 | if (epoch < xconn->epoch) | |
241 | p = &(*p)->rb_left; | |
242 | else if (epoch > xconn->epoch) | |
243 | p = &(*p)->rb_right; | |
0d12f8a4 | 244 | else if (cid < xconn->cid) |
17926a79 | 245 | p = &(*p)->rb_left; |
0d12f8a4 | 246 | else if (cid > xconn->cid) |
17926a79 DH |
247 | p = &(*p)->rb_right; |
248 | else | |
249 | goto id_exists; | |
250 | } | |
251 | ||
252 | /* we've found a suitable hole - arrange for this connection to occupy | |
253 | * it */ | |
254 | rb_link_node(&conn->node, parent, p); | |
255 | rb_insert_color(&conn->node, &conn->trans->client_conns); | |
256 | ||
0d12f8a4 | 257 | conn->cid = cid; |
17926a79 | 258 | write_unlock_bh(&conn->trans->conn_lock); |
0d12f8a4 | 259 | _leave(" [CID %x]", cid); |
17926a79 DH |
260 | return; |
261 | ||
262 | /* we found a connection with the proposed ID - walk the tree from that | |
263 | * point looking for the next unused ID */ | |
264 | id_exists: | |
265 | for (;;) { | |
0d12f8a4 DH |
266 | cid += RXRPC_CID_INC; |
267 | if (cid < RXRPC_CID_INC) { | |
268 | cid = RXRPC_CID_INC; | |
269 | conn->trans->conn_idcounter = cid; | |
17926a79 DH |
270 | goto attempt_insertion; |
271 | } | |
272 | ||
273 | parent = rb_next(parent); | |
274 | if (!parent) | |
275 | goto attempt_insertion; | |
276 | ||
277 | xconn = rb_entry(parent, struct rxrpc_connection, node); | |
278 | if (epoch < xconn->epoch || | |
0d12f8a4 | 279 | cid < xconn->cid) |
17926a79 DH |
280 | goto attempt_insertion; |
281 | } | |
282 | } | |
283 | ||
284 | /* | |
285 | * add a call to a connection's call-by-ID tree | |
286 | */ | |
287 | static void rxrpc_add_call_ID_to_conn(struct rxrpc_connection *conn, | |
288 | struct rxrpc_call *call) | |
289 | { | |
290 | struct rxrpc_call *xcall; | |
291 | struct rb_node *parent, **p; | |
292 | __be32 call_id; | |
293 | ||
294 | write_lock_bh(&conn->lock); | |
295 | ||
296 | call_id = call->call_id; | |
297 | p = &conn->calls.rb_node; | |
298 | parent = NULL; | |
299 | while (*p) { | |
300 | parent = *p; | |
301 | xcall = rb_entry(parent, struct rxrpc_call, conn_node); | |
302 | ||
303 | if (call_id < xcall->call_id) | |
304 | p = &(*p)->rb_left; | |
305 | else if (call_id > xcall->call_id) | |
306 | p = &(*p)->rb_right; | |
307 | else | |
308 | BUG(); | |
309 | } | |
310 | ||
311 | rb_link_node(&call->conn_node, parent, p); | |
312 | rb_insert_color(&call->conn_node, &conn->calls); | |
313 | ||
314 | write_unlock_bh(&conn->lock); | |
315 | } | |
316 | ||
317 | /* | |
318 | * connect a call on an exclusive connection | |
319 | */ | |
320 | static int rxrpc_connect_exclusive(struct rxrpc_sock *rx, | |
321 | struct rxrpc_transport *trans, | |
0d12f8a4 | 322 | u16 service_id, |
17926a79 DH |
323 | struct rxrpc_call *call, |
324 | gfp_t gfp) | |
325 | { | |
326 | struct rxrpc_connection *conn; | |
327 | int chan, ret; | |
328 | ||
329 | _enter(""); | |
330 | ||
331 | conn = rx->conn; | |
332 | if (!conn) { | |
333 | /* not yet present - create a candidate for a new connection | |
334 | * and then redo the check */ | |
335 | conn = rxrpc_alloc_connection(gfp); | |
0975ecba DC |
336 | if (!conn) { |
337 | _leave(" = -ENOMEM"); | |
338 | return -ENOMEM; | |
17926a79 DH |
339 | } |
340 | ||
341 | conn->trans = trans; | |
342 | conn->bundle = NULL; | |
343 | conn->service_id = service_id; | |
344 | conn->epoch = rxrpc_epoch; | |
345 | conn->in_clientflag = 0; | |
346 | conn->out_clientflag = RXRPC_CLIENT_INITIATED; | |
347 | conn->cid = 0; | |
348 | conn->state = RXRPC_CONN_CLIENT; | |
651350d1 | 349 | conn->avail_calls = RXRPC_MAXCALLS - 1; |
17926a79 DH |
350 | conn->security_level = rx->min_sec_level; |
351 | conn->key = key_get(rx->key); | |
352 | ||
353 | ret = rxrpc_init_client_conn_security(conn); | |
354 | if (ret < 0) { | |
355 | key_put(conn->key); | |
356 | kfree(conn); | |
357 | _leave(" = %d [key]", ret); | |
358 | return ret; | |
359 | } | |
360 | ||
361 | write_lock_bh(&rxrpc_connection_lock); | |
362 | list_add_tail(&conn->link, &rxrpc_connections); | |
363 | write_unlock_bh(&rxrpc_connection_lock); | |
364 | ||
365 | spin_lock(&trans->client_lock); | |
366 | atomic_inc(&trans->usage); | |
367 | ||
368 | _net("CONNECT EXCL new %d on TRANS %d", | |
369 | conn->debug_id, conn->trans->debug_id); | |
370 | ||
371 | rxrpc_assign_connection_id(conn); | |
372 | rx->conn = conn; | |
8f22ba61 AK |
373 | } else { |
374 | spin_lock(&trans->client_lock); | |
17926a79 DH |
375 | } |
376 | ||
377 | /* we've got a connection with a free channel and we can now attach the | |
378 | * call to it | |
379 | * - we're holding the transport's client lock | |
380 | * - we're holding a reference on the connection | |
381 | */ | |
382 | for (chan = 0; chan < RXRPC_MAXCALLS; chan++) | |
383 | if (!conn->channels[chan]) | |
384 | goto found_channel; | |
385 | goto no_free_channels; | |
386 | ||
387 | found_channel: | |
388 | atomic_inc(&conn->usage); | |
389 | conn->channels[chan] = call; | |
390 | call->conn = conn; | |
391 | call->channel = chan; | |
0d12f8a4 DH |
392 | call->cid = conn->cid | chan; |
393 | call->call_id = ++conn->call_counter; | |
17926a79 DH |
394 | |
395 | _net("CONNECT client on conn %d chan %d as call %x", | |
0d12f8a4 | 396 | conn->debug_id, chan, call->call_id); |
17926a79 DH |
397 | |
398 | spin_unlock(&trans->client_lock); | |
399 | ||
400 | rxrpc_add_call_ID_to_conn(conn, call); | |
401 | _leave(" = 0"); | |
402 | return 0; | |
403 | ||
404 | no_free_channels: | |
405 | spin_unlock(&trans->client_lock); | |
406 | _leave(" = -ENOSR"); | |
407 | return -ENOSR; | |
408 | } | |
409 | ||
410 | /* | |
411 | * find a connection for a call | |
412 | * - called in process context with IRQs enabled | |
413 | */ | |
414 | int rxrpc_connect_call(struct rxrpc_sock *rx, | |
415 | struct rxrpc_transport *trans, | |
416 | struct rxrpc_conn_bundle *bundle, | |
417 | struct rxrpc_call *call, | |
418 | gfp_t gfp) | |
419 | { | |
420 | struct rxrpc_connection *conn, *candidate; | |
421 | int chan, ret; | |
422 | ||
423 | DECLARE_WAITQUEUE(myself, current); | |
424 | ||
425 | _enter("%p,%lx,", rx, call->user_call_ID); | |
426 | ||
427 | if (test_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags)) | |
428 | return rxrpc_connect_exclusive(rx, trans, bundle->service_id, | |
429 | call, gfp); | |
430 | ||
431 | spin_lock(&trans->client_lock); | |
432 | for (;;) { | |
433 | /* see if the bundle has a call slot available */ | |
434 | if (!list_empty(&bundle->avail_conns)) { | |
435 | _debug("avail"); | |
436 | conn = list_entry(bundle->avail_conns.next, | |
437 | struct rxrpc_connection, | |
438 | bundle_link); | |
519d2567 DH |
439 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
440 | list_del_init(&conn->bundle_link); | |
441 | bundle->num_conns--; | |
442 | continue; | |
443 | } | |
17926a79 DH |
444 | if (--conn->avail_calls == 0) |
445 | list_move(&conn->bundle_link, | |
446 | &bundle->busy_conns); | |
651350d1 DH |
447 | ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS); |
448 | ASSERT(conn->channels[0] == NULL || | |
449 | conn->channels[1] == NULL || | |
450 | conn->channels[2] == NULL || | |
451 | conn->channels[3] == NULL); | |
17926a79 DH |
452 | atomic_inc(&conn->usage); |
453 | break; | |
454 | } | |
455 | ||
456 | if (!list_empty(&bundle->unused_conns)) { | |
457 | _debug("unused"); | |
458 | conn = list_entry(bundle->unused_conns.next, | |
459 | struct rxrpc_connection, | |
460 | bundle_link); | |
519d2567 DH |
461 | if (conn->state >= RXRPC_CONN_REMOTELY_ABORTED) { |
462 | list_del_init(&conn->bundle_link); | |
463 | bundle->num_conns--; | |
464 | continue; | |
465 | } | |
651350d1 DH |
466 | ASSERTCMP(conn->avail_calls, ==, RXRPC_MAXCALLS); |
467 | conn->avail_calls = RXRPC_MAXCALLS - 1; | |
468 | ASSERT(conn->channels[0] == NULL && | |
469 | conn->channels[1] == NULL && | |
470 | conn->channels[2] == NULL && | |
471 | conn->channels[3] == NULL); | |
17926a79 DH |
472 | atomic_inc(&conn->usage); |
473 | list_move(&conn->bundle_link, &bundle->avail_conns); | |
474 | break; | |
475 | } | |
476 | ||
477 | /* need to allocate a new connection */ | |
478 | _debug("get new conn [%d]", bundle->num_conns); | |
479 | ||
480 | spin_unlock(&trans->client_lock); | |
481 | ||
482 | if (signal_pending(current)) | |
483 | goto interrupted; | |
484 | ||
485 | if (bundle->num_conns >= 20) { | |
486 | _debug("too many conns"); | |
487 | ||
d0164adc | 488 | if (!gfpflags_allow_blocking(gfp)) { |
17926a79 DH |
489 | _leave(" = -EAGAIN"); |
490 | return -EAGAIN; | |
491 | } | |
492 | ||
493 | add_wait_queue(&bundle->chanwait, &myself); | |
494 | for (;;) { | |
495 | set_current_state(TASK_INTERRUPTIBLE); | |
496 | if (bundle->num_conns < 20 || | |
497 | !list_empty(&bundle->unused_conns) || | |
498 | !list_empty(&bundle->avail_conns)) | |
499 | break; | |
500 | if (signal_pending(current)) | |
501 | goto interrupted_dequeue; | |
502 | schedule(); | |
503 | } | |
504 | remove_wait_queue(&bundle->chanwait, &myself); | |
505 | __set_current_state(TASK_RUNNING); | |
506 | spin_lock(&trans->client_lock); | |
507 | continue; | |
508 | } | |
509 | ||
510 | /* not yet present - create a candidate for a new connection and then | |
511 | * redo the check */ | |
512 | candidate = rxrpc_alloc_connection(gfp); | |
0975ecba DC |
513 | if (!candidate) { |
514 | _leave(" = -ENOMEM"); | |
515 | return -ENOMEM; | |
17926a79 DH |
516 | } |
517 | ||
518 | candidate->trans = trans; | |
519 | candidate->bundle = bundle; | |
520 | candidate->service_id = bundle->service_id; | |
521 | candidate->epoch = rxrpc_epoch; | |
522 | candidate->in_clientflag = 0; | |
523 | candidate->out_clientflag = RXRPC_CLIENT_INITIATED; | |
524 | candidate->cid = 0; | |
525 | candidate->state = RXRPC_CONN_CLIENT; | |
526 | candidate->avail_calls = RXRPC_MAXCALLS; | |
527 | candidate->security_level = rx->min_sec_level; | |
651350d1 | 528 | candidate->key = key_get(bundle->key); |
17926a79 DH |
529 | |
530 | ret = rxrpc_init_client_conn_security(candidate); | |
531 | if (ret < 0) { | |
532 | key_put(candidate->key); | |
533 | kfree(candidate); | |
534 | _leave(" = %d [key]", ret); | |
535 | return ret; | |
536 | } | |
537 | ||
538 | write_lock_bh(&rxrpc_connection_lock); | |
539 | list_add_tail(&candidate->link, &rxrpc_connections); | |
540 | write_unlock_bh(&rxrpc_connection_lock); | |
541 | ||
542 | spin_lock(&trans->client_lock); | |
543 | ||
544 | list_add(&candidate->bundle_link, &bundle->unused_conns); | |
545 | bundle->num_conns++; | |
546 | atomic_inc(&bundle->usage); | |
547 | atomic_inc(&trans->usage); | |
548 | ||
549 | _net("CONNECT new %d on TRANS %d", | |
550 | candidate->debug_id, candidate->trans->debug_id); | |
551 | ||
552 | rxrpc_assign_connection_id(candidate); | |
e0e4d82f | 553 | candidate->security->prime_packet_security(candidate); |
17926a79 DH |
554 | |
555 | /* leave the candidate lurking in zombie mode attached to the | |
556 | * bundle until we're ready for it */ | |
557 | rxrpc_put_connection(candidate); | |
558 | candidate = NULL; | |
559 | } | |
560 | ||
561 | /* we've got a connection with a free channel and we can now attach the | |
562 | * call to it | |
563 | * - we're holding the transport's client lock | |
564 | * - we're holding a reference on the connection | |
565 | * - we're holding a reference on the bundle | |
566 | */ | |
567 | for (chan = 0; chan < RXRPC_MAXCALLS; chan++) | |
568 | if (!conn->channels[chan]) | |
569 | goto found_channel; | |
651350d1 DH |
570 | ASSERT(conn->channels[0] == NULL || |
571 | conn->channels[1] == NULL || | |
572 | conn->channels[2] == NULL || | |
573 | conn->channels[3] == NULL); | |
17926a79 DH |
574 | BUG(); |
575 | ||
576 | found_channel: | |
577 | conn->channels[chan] = call; | |
578 | call->conn = conn; | |
579 | call->channel = chan; | |
0d12f8a4 DH |
580 | call->cid = conn->cid | chan; |
581 | call->call_id = ++conn->call_counter; | |
17926a79 DH |
582 | |
583 | _net("CONNECT client on conn %d chan %d as call %x", | |
0d12f8a4 | 584 | conn->debug_id, chan, call->call_id); |
17926a79 | 585 | |
651350d1 | 586 | ASSERTCMP(conn->avail_calls, <, RXRPC_MAXCALLS); |
17926a79 DH |
587 | spin_unlock(&trans->client_lock); |
588 | ||
589 | rxrpc_add_call_ID_to_conn(conn, call); | |
590 | ||
591 | _leave(" = 0"); | |
592 | return 0; | |
593 | ||
594 | interrupted_dequeue: | |
595 | remove_wait_queue(&bundle->chanwait, &myself); | |
596 | __set_current_state(TASK_RUNNING); | |
597 | interrupted: | |
598 | _leave(" = -ERESTARTSYS"); | |
599 | return -ERESTARTSYS; | |
600 | } | |
601 | ||
602 | /* | |
603 | * get a record of an incoming connection | |
604 | */ | |
605 | struct rxrpc_connection * | |
606 | rxrpc_incoming_connection(struct rxrpc_transport *trans, | |
843099ca | 607 | struct rxrpc_host_header *hdr) |
17926a79 DH |
608 | { |
609 | struct rxrpc_connection *conn, *candidate = NULL; | |
610 | struct rb_node *p, **pp; | |
611 | const char *new = "old"; | |
612 | __be32 epoch; | |
0d12f8a4 | 613 | u32 cid; |
17926a79 DH |
614 | |
615 | _enter(""); | |
616 | ||
617 | ASSERT(hdr->flags & RXRPC_CLIENT_INITIATED); | |
618 | ||
619 | epoch = hdr->epoch; | |
0d12f8a4 | 620 | cid = hdr->cid & RXRPC_CIDMASK; |
17926a79 DH |
621 | |
622 | /* search the connection list first */ | |
623 | read_lock_bh(&trans->conn_lock); | |
624 | ||
625 | p = trans->server_conns.rb_node; | |
626 | while (p) { | |
627 | conn = rb_entry(p, struct rxrpc_connection, node); | |
628 | ||
0d12f8a4 | 629 | _debug("maybe %x", conn->cid); |
17926a79 DH |
630 | |
631 | if (epoch < conn->epoch) | |
632 | p = p->rb_left; | |
633 | else if (epoch > conn->epoch) | |
634 | p = p->rb_right; | |
0d12f8a4 | 635 | else if (cid < conn->cid) |
17926a79 | 636 | p = p->rb_left; |
0d12f8a4 | 637 | else if (cid > conn->cid) |
17926a79 DH |
638 | p = p->rb_right; |
639 | else | |
640 | goto found_extant_connection; | |
641 | } | |
642 | read_unlock_bh(&trans->conn_lock); | |
643 | ||
644 | /* not yet present - create a candidate for a new record and then | |
645 | * redo the search */ | |
843099ca | 646 | candidate = rxrpc_alloc_connection(GFP_NOIO); |
17926a79 DH |
647 | if (!candidate) { |
648 | _leave(" = -ENOMEM"); | |
649 | return ERR_PTR(-ENOMEM); | |
650 | } | |
651 | ||
652 | candidate->trans = trans; | |
653 | candidate->epoch = hdr->epoch; | |
0d12f8a4 | 654 | candidate->cid = hdr->cid & RXRPC_CIDMASK; |
17926a79 DH |
655 | candidate->service_id = hdr->serviceId; |
656 | candidate->security_ix = hdr->securityIndex; | |
657 | candidate->in_clientflag = RXRPC_CLIENT_INITIATED; | |
658 | candidate->out_clientflag = 0; | |
17926a79 DH |
659 | candidate->state = RXRPC_CONN_SERVER; |
660 | if (candidate->service_id) | |
661 | candidate->state = RXRPC_CONN_SERVER_UNSECURED; | |
662 | ||
663 | write_lock_bh(&trans->conn_lock); | |
664 | ||
665 | pp = &trans->server_conns.rb_node; | |
666 | p = NULL; | |
667 | while (*pp) { | |
668 | p = *pp; | |
669 | conn = rb_entry(p, struct rxrpc_connection, node); | |
670 | ||
671 | if (epoch < conn->epoch) | |
672 | pp = &(*pp)->rb_left; | |
673 | else if (epoch > conn->epoch) | |
674 | pp = &(*pp)->rb_right; | |
0d12f8a4 | 675 | else if (cid < conn->cid) |
17926a79 | 676 | pp = &(*pp)->rb_left; |
0d12f8a4 | 677 | else if (cid > conn->cid) |
17926a79 DH |
678 | pp = &(*pp)->rb_right; |
679 | else | |
680 | goto found_extant_second; | |
681 | } | |
682 | ||
683 | /* we can now add the new candidate to the list */ | |
684 | conn = candidate; | |
685 | candidate = NULL; | |
686 | rb_link_node(&conn->node, p, pp); | |
687 | rb_insert_color(&conn->node, &trans->server_conns); | |
688 | atomic_inc(&conn->trans->usage); | |
689 | ||
690 | write_unlock_bh(&trans->conn_lock); | |
691 | ||
692 | write_lock_bh(&rxrpc_connection_lock); | |
693 | list_add_tail(&conn->link, &rxrpc_connections); | |
694 | write_unlock_bh(&rxrpc_connection_lock); | |
695 | ||
696 | new = "new"; | |
697 | ||
698 | success: | |
0d12f8a4 | 699 | _net("CONNECTION %s %d {%x}", new, conn->debug_id, conn->cid); |
17926a79 DH |
700 | |
701 | _leave(" = %p {u=%d}", conn, atomic_read(&conn->usage)); | |
702 | return conn; | |
703 | ||
704 | /* we found the connection in the list immediately */ | |
705 | found_extant_connection: | |
706 | if (hdr->securityIndex != conn->security_ix) { | |
707 | read_unlock_bh(&trans->conn_lock); | |
708 | goto security_mismatch; | |
709 | } | |
710 | atomic_inc(&conn->usage); | |
711 | read_unlock_bh(&trans->conn_lock); | |
712 | goto success; | |
713 | ||
714 | /* we found the connection on the second time through the list */ | |
715 | found_extant_second: | |
716 | if (hdr->securityIndex != conn->security_ix) { | |
717 | write_unlock_bh(&trans->conn_lock); | |
718 | goto security_mismatch; | |
719 | } | |
720 | atomic_inc(&conn->usage); | |
721 | write_unlock_bh(&trans->conn_lock); | |
722 | kfree(candidate); | |
723 | goto success; | |
724 | ||
725 | security_mismatch: | |
726 | kfree(candidate); | |
727 | _leave(" = -EKEYREJECTED"); | |
728 | return ERR_PTR(-EKEYREJECTED); | |
729 | } | |
730 | ||
731 | /* | |
732 | * find a connection based on transport and RxRPC connection ID for an incoming | |
733 | * packet | |
734 | */ | |
735 | struct rxrpc_connection *rxrpc_find_connection(struct rxrpc_transport *trans, | |
0d12f8a4 | 736 | struct rxrpc_host_header *hdr) |
17926a79 DH |
737 | { |
738 | struct rxrpc_connection *conn; | |
739 | struct rb_node *p; | |
0d12f8a4 | 740 | u32 epoch, cid; |
17926a79 | 741 | |
0d12f8a4 | 742 | _enter(",{%x,%x}", hdr->cid, hdr->flags); |
17926a79 DH |
743 | |
744 | read_lock_bh(&trans->conn_lock); | |
745 | ||
0d12f8a4 | 746 | cid = hdr->cid & RXRPC_CIDMASK; |
17926a79 DH |
747 | epoch = hdr->epoch; |
748 | ||
749 | if (hdr->flags & RXRPC_CLIENT_INITIATED) | |
750 | p = trans->server_conns.rb_node; | |
751 | else | |
752 | p = trans->client_conns.rb_node; | |
753 | ||
754 | while (p) { | |
755 | conn = rb_entry(p, struct rxrpc_connection, node); | |
756 | ||
0d12f8a4 | 757 | _debug("maybe %x", conn->cid); |
17926a79 DH |
758 | |
759 | if (epoch < conn->epoch) | |
760 | p = p->rb_left; | |
761 | else if (epoch > conn->epoch) | |
762 | p = p->rb_right; | |
0d12f8a4 | 763 | else if (cid < conn->cid) |
17926a79 | 764 | p = p->rb_left; |
0d12f8a4 | 765 | else if (cid > conn->cid) |
17926a79 DH |
766 | p = p->rb_right; |
767 | else | |
768 | goto found; | |
769 | } | |
770 | ||
771 | read_unlock_bh(&trans->conn_lock); | |
772 | _leave(" = NULL"); | |
773 | return NULL; | |
774 | ||
775 | found: | |
776 | atomic_inc(&conn->usage); | |
777 | read_unlock_bh(&trans->conn_lock); | |
778 | _leave(" = %p", conn); | |
779 | return conn; | |
780 | } | |
781 | ||
782 | /* | |
783 | * release a virtual connection | |
784 | */ | |
785 | void rxrpc_put_connection(struct rxrpc_connection *conn) | |
786 | { | |
787 | _enter("%p{u=%d,d=%d}", | |
788 | conn, atomic_read(&conn->usage), conn->debug_id); | |
789 | ||
790 | ASSERTCMP(atomic_read(&conn->usage), >, 0); | |
791 | ||
22a3f9a2 | 792 | conn->put_time = ktime_get_seconds(); |
17926a79 DH |
793 | if (atomic_dec_and_test(&conn->usage)) { |
794 | _debug("zombie"); | |
651350d1 | 795 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
17926a79 DH |
796 | } |
797 | ||
798 | _leave(""); | |
799 | } | |
800 | ||
801 | /* | |
802 | * destroy a virtual connection | |
803 | */ | |
804 | static void rxrpc_destroy_connection(struct rxrpc_connection *conn) | |
805 | { | |
806 | _enter("%p{%d}", conn, atomic_read(&conn->usage)); | |
807 | ||
808 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); | |
809 | ||
810 | _net("DESTROY CONN %d", conn->debug_id); | |
811 | ||
812 | if (conn->bundle) | |
813 | rxrpc_put_bundle(conn->trans, conn->bundle); | |
814 | ||
815 | ASSERT(RB_EMPTY_ROOT(&conn->calls)); | |
816 | rxrpc_purge_queue(&conn->rx_queue); | |
817 | ||
e0e4d82f DH |
818 | conn->security->clear(conn); |
819 | key_put(conn->key); | |
820 | key_put(conn->server_key); | |
821 | ||
17926a79 DH |
822 | rxrpc_put_transport(conn->trans); |
823 | kfree(conn); | |
824 | _leave(""); | |
825 | } | |
826 | ||
827 | /* | |
828 | * reap dead connections | |
829 | */ | |
5eaa65b2 | 830 | static void rxrpc_connection_reaper(struct work_struct *work) |
17926a79 DH |
831 | { |
832 | struct rxrpc_connection *conn, *_p; | |
833 | unsigned long now, earliest, reap_time; | |
834 | ||
835 | LIST_HEAD(graveyard); | |
836 | ||
837 | _enter(""); | |
838 | ||
22a3f9a2 | 839 | now = ktime_get_seconds(); |
17926a79 DH |
840 | earliest = ULONG_MAX; |
841 | ||
842 | write_lock_bh(&rxrpc_connection_lock); | |
843 | list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) { | |
844 | _debug("reap CONN %d { u=%d,t=%ld }", | |
845 | conn->debug_id, atomic_read(&conn->usage), | |
846 | (long) now - (long) conn->put_time); | |
847 | ||
848 | if (likely(atomic_read(&conn->usage) > 0)) | |
849 | continue; | |
850 | ||
851 | spin_lock(&conn->trans->client_lock); | |
852 | write_lock(&conn->trans->conn_lock); | |
5873c083 | 853 | reap_time = conn->put_time + rxrpc_connection_expiry; |
17926a79 DH |
854 | |
855 | if (atomic_read(&conn->usage) > 0) { | |
856 | ; | |
857 | } else if (reap_time <= now) { | |
858 | list_move_tail(&conn->link, &graveyard); | |
859 | if (conn->out_clientflag) | |
860 | rb_erase(&conn->node, | |
861 | &conn->trans->client_conns); | |
862 | else | |
863 | rb_erase(&conn->node, | |
864 | &conn->trans->server_conns); | |
865 | if (conn->bundle) { | |
866 | list_del_init(&conn->bundle_link); | |
867 | conn->bundle->num_conns--; | |
868 | } | |
869 | ||
870 | } else if (reap_time < earliest) { | |
871 | earliest = reap_time; | |
872 | } | |
873 | ||
874 | write_unlock(&conn->trans->conn_lock); | |
875 | spin_unlock(&conn->trans->client_lock); | |
876 | } | |
877 | write_unlock_bh(&rxrpc_connection_lock); | |
878 | ||
879 | if (earliest != ULONG_MAX) { | |
880 | _debug("reschedule reaper %ld", (long) earliest - now); | |
881 | ASSERTCMP(earliest, >, now); | |
651350d1 DH |
882 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, |
883 | (earliest - now) * HZ); | |
17926a79 DH |
884 | } |
885 | ||
886 | /* then destroy all those pulled out */ | |
887 | while (!list_empty(&graveyard)) { | |
888 | conn = list_entry(graveyard.next, struct rxrpc_connection, | |
889 | link); | |
890 | list_del_init(&conn->link); | |
891 | ||
892 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); | |
893 | rxrpc_destroy_connection(conn); | |
894 | } | |
895 | ||
896 | _leave(""); | |
897 | } | |
898 | ||
899 | /* | |
900 | * preemptively destroy all the connection records rather than waiting for them | |
901 | * to time out | |
902 | */ | |
903 | void __exit rxrpc_destroy_all_connections(void) | |
904 | { | |
905 | _enter(""); | |
906 | ||
5873c083 | 907 | rxrpc_connection_expiry = 0; |
17926a79 | 908 | cancel_delayed_work(&rxrpc_connection_reap); |
651350d1 | 909 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
17926a79 DH |
910 | |
911 | _leave(""); | |
912 | } |