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17926a79 DH |
1 | /* RxRPC individual remote procedure call handling |
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> | |
13 | #include <linux/circ_buf.h> | |
14 | #include <net/sock.h> | |
15 | #include <net/af_rxrpc.h> | |
16 | #include "ar-internal.h" | |
17 | ||
1f8481d1 DH |
18 | const char *rxrpc_call_states[] = { |
19 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", | |
20 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", | |
21 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", | |
22 | [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK", | |
23 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", | |
24 | [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", | |
25 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", | |
26 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", | |
27 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", | |
28 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", | |
29 | [RXRPC_CALL_COMPLETE] = "Complete", | |
30 | [RXRPC_CALL_SERVER_BUSY] = "SvBusy ", | |
31 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", | |
32 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
33 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", | |
34 | [RXRPC_CALL_DEAD] = "Dead ", | |
35 | }; | |
36 | ||
17926a79 DH |
37 | struct kmem_cache *rxrpc_call_jar; |
38 | LIST_HEAD(rxrpc_calls); | |
39 | DEFINE_RWLOCK(rxrpc_call_lock); | |
40 | static unsigned rxrpc_call_max_lifetime = 60; | |
651350d1 | 41 | static unsigned rxrpc_dead_call_timeout = 2; |
17926a79 DH |
42 | |
43 | static void rxrpc_destroy_call(struct work_struct *work); | |
44 | static void rxrpc_call_life_expired(unsigned long _call); | |
45 | static void rxrpc_dead_call_expired(unsigned long _call); | |
46 | static void rxrpc_ack_time_expired(unsigned long _call); | |
47 | static void rxrpc_resend_time_expired(unsigned long _call); | |
48 | ||
49 | /* | |
50 | * allocate a new call | |
51 | */ | |
52 | static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) | |
53 | { | |
54 | struct rxrpc_call *call; | |
55 | ||
56 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
57 | if (!call) | |
58 | return NULL; | |
59 | ||
60 | call->acks_winsz = 16; | |
61 | call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long), | |
62 | gfp); | |
63 | if (!call->acks_window) { | |
64 | kmem_cache_free(rxrpc_call_jar, call); | |
65 | return NULL; | |
66 | } | |
67 | ||
68 | setup_timer(&call->lifetimer, &rxrpc_call_life_expired, | |
69 | (unsigned long) call); | |
70 | setup_timer(&call->deadspan, &rxrpc_dead_call_expired, | |
71 | (unsigned long) call); | |
72 | setup_timer(&call->ack_timer, &rxrpc_ack_time_expired, | |
73 | (unsigned long) call); | |
74 | setup_timer(&call->resend_timer, &rxrpc_resend_time_expired, | |
75 | (unsigned long) call); | |
76 | INIT_WORK(&call->destroyer, &rxrpc_destroy_call); | |
77 | INIT_WORK(&call->processor, &rxrpc_process_call); | |
78 | INIT_LIST_HEAD(&call->accept_link); | |
79 | skb_queue_head_init(&call->rx_queue); | |
80 | skb_queue_head_init(&call->rx_oos_queue); | |
81 | init_waitqueue_head(&call->tx_waitq); | |
82 | spin_lock_init(&call->lock); | |
83 | rwlock_init(&call->state_lock); | |
84 | atomic_set(&call->usage, 1); | |
85 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); | |
86 | call->state = RXRPC_CALL_CLIENT_SEND_REQUEST; | |
87 | ||
88 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
89 | ||
90 | call->rx_data_expect = 1; | |
91 | call->rx_data_eaten = 0; | |
92 | call->rx_first_oos = 0; | |
93 | call->ackr_win_top = call->rx_data_eaten + 1 + RXRPC_MAXACKS; | |
94 | call->creation_jif = jiffies; | |
95 | return call; | |
96 | } | |
97 | ||
98 | /* | |
99 | * allocate a new client call and attempt to to get a connection slot for it | |
100 | */ | |
101 | static struct rxrpc_call *rxrpc_alloc_client_call( | |
102 | struct rxrpc_sock *rx, | |
103 | struct rxrpc_transport *trans, | |
104 | struct rxrpc_conn_bundle *bundle, | |
105 | gfp_t gfp) | |
106 | { | |
107 | struct rxrpc_call *call; | |
108 | int ret; | |
109 | ||
110 | _enter(""); | |
111 | ||
112 | ASSERT(rx != NULL); | |
113 | ASSERT(trans != NULL); | |
114 | ASSERT(bundle != NULL); | |
115 | ||
116 | call = rxrpc_alloc_call(gfp); | |
117 | if (!call) | |
118 | return ERR_PTR(-ENOMEM); | |
119 | ||
120 | sock_hold(&rx->sk); | |
121 | call->socket = rx; | |
122 | call->rx_data_post = 1; | |
123 | ||
124 | ret = rxrpc_connect_call(rx, trans, bundle, call, gfp); | |
125 | if (ret < 0) { | |
126 | kmem_cache_free(rxrpc_call_jar, call); | |
127 | return ERR_PTR(ret); | |
128 | } | |
129 | ||
130 | spin_lock(&call->conn->trans->peer->lock); | |
131 | list_add(&call->error_link, &call->conn->trans->peer->error_targets); | |
132 | spin_unlock(&call->conn->trans->peer->lock); | |
133 | ||
134 | call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ; | |
135 | add_timer(&call->lifetimer); | |
136 | ||
137 | _leave(" = %p", call); | |
138 | return call; | |
139 | } | |
140 | ||
141 | /* | |
142 | * set up a call for the given data | |
143 | * - called in process context with IRQs enabled | |
144 | */ | |
145 | struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx, | |
146 | struct rxrpc_transport *trans, | |
147 | struct rxrpc_conn_bundle *bundle, | |
148 | unsigned long user_call_ID, | |
149 | int create, | |
150 | gfp_t gfp) | |
151 | { | |
152 | struct rxrpc_call *call, *candidate; | |
153 | struct rb_node *p, *parent, **pp; | |
154 | ||
155 | _enter("%p,%d,%d,%lx,%d", | |
156 | rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1, | |
157 | user_call_ID, create); | |
158 | ||
159 | /* search the extant calls first for one that matches the specified | |
160 | * user ID */ | |
161 | read_lock(&rx->call_lock); | |
162 | ||
163 | p = rx->calls.rb_node; | |
164 | while (p) { | |
165 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
166 | ||
167 | if (user_call_ID < call->user_call_ID) | |
168 | p = p->rb_left; | |
169 | else if (user_call_ID > call->user_call_ID) | |
170 | p = p->rb_right; | |
171 | else | |
172 | goto found_extant_call; | |
173 | } | |
174 | ||
175 | read_unlock(&rx->call_lock); | |
176 | ||
177 | if (!create || !trans) | |
178 | return ERR_PTR(-EBADSLT); | |
179 | ||
180 | /* not yet present - create a candidate for a new record and then | |
181 | * redo the search */ | |
182 | candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp); | |
183 | if (IS_ERR(candidate)) { | |
184 | _leave(" = %ld", PTR_ERR(candidate)); | |
185 | return candidate; | |
186 | } | |
187 | ||
188 | candidate->user_call_ID = user_call_ID; | |
189 | __set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags); | |
190 | ||
191 | write_lock(&rx->call_lock); | |
192 | ||
193 | pp = &rx->calls.rb_node; | |
194 | parent = NULL; | |
195 | while (*pp) { | |
196 | parent = *pp; | |
197 | call = rb_entry(parent, struct rxrpc_call, sock_node); | |
198 | ||
199 | if (user_call_ID < call->user_call_ID) | |
200 | pp = &(*pp)->rb_left; | |
201 | else if (user_call_ID > call->user_call_ID) | |
202 | pp = &(*pp)->rb_right; | |
203 | else | |
204 | goto found_extant_second; | |
205 | } | |
206 | ||
207 | /* second search also failed; add the new call */ | |
208 | call = candidate; | |
209 | candidate = NULL; | |
210 | rxrpc_get_call(call); | |
211 | ||
212 | rb_link_node(&call->sock_node, parent, pp); | |
213 | rb_insert_color(&call->sock_node, &rx->calls); | |
214 | write_unlock(&rx->call_lock); | |
215 | ||
216 | write_lock_bh(&rxrpc_call_lock); | |
217 | list_add_tail(&call->link, &rxrpc_calls); | |
218 | write_unlock_bh(&rxrpc_call_lock); | |
219 | ||
220 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); | |
221 | ||
222 | _leave(" = %p [new]", call); | |
223 | return call; | |
224 | ||
225 | /* we found the call in the list immediately */ | |
226 | found_extant_call: | |
227 | rxrpc_get_call(call); | |
228 | read_unlock(&rx->call_lock); | |
229 | _leave(" = %p [extant %d]", call, atomic_read(&call->usage)); | |
230 | return call; | |
231 | ||
232 | /* we found the call on the second time through the list */ | |
233 | found_extant_second: | |
234 | rxrpc_get_call(call); | |
235 | write_unlock(&rx->call_lock); | |
236 | rxrpc_put_call(candidate); | |
237 | _leave(" = %p [second %d]", call, atomic_read(&call->usage)); | |
238 | return call; | |
239 | } | |
240 | ||
241 | /* | |
242 | * set up an incoming call | |
243 | * - called in process context with IRQs enabled | |
244 | */ | |
245 | struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, | |
246 | struct rxrpc_connection *conn, | |
247 | struct rxrpc_header *hdr, | |
248 | gfp_t gfp) | |
249 | { | |
250 | struct rxrpc_call *call, *candidate; | |
251 | struct rb_node **p, *parent; | |
252 | __be32 call_id; | |
253 | ||
254 | _enter(",%d,,%x", conn->debug_id, gfp); | |
255 | ||
256 | ASSERT(rx != NULL); | |
257 | ||
258 | candidate = rxrpc_alloc_call(gfp); | |
259 | if (!candidate) | |
260 | return ERR_PTR(-EBUSY); | |
261 | ||
262 | candidate->socket = rx; | |
263 | candidate->conn = conn; | |
264 | candidate->cid = hdr->cid; | |
265 | candidate->call_id = hdr->callNumber; | |
266 | candidate->channel = ntohl(hdr->cid) & RXRPC_CHANNELMASK; | |
267 | candidate->rx_data_post = 0; | |
268 | candidate->state = RXRPC_CALL_SERVER_ACCEPTING; | |
269 | if (conn->security_ix > 0) | |
270 | candidate->state = RXRPC_CALL_SERVER_SECURING; | |
271 | ||
272 | write_lock_bh(&conn->lock); | |
273 | ||
274 | /* set the channel for this call */ | |
275 | call = conn->channels[candidate->channel]; | |
276 | _debug("channel[%u] is %p", candidate->channel, call); | |
277 | if (call && call->call_id == hdr->callNumber) { | |
278 | /* already set; must've been a duplicate packet */ | |
279 | _debug("extant call [%d]", call->state); | |
280 | ASSERTCMP(call->conn, ==, conn); | |
281 | ||
282 | read_lock(&call->state_lock); | |
283 | switch (call->state) { | |
284 | case RXRPC_CALL_LOCALLY_ABORTED: | |
285 | if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) | |
651350d1 | 286 | rxrpc_queue_call(call); |
17926a79 DH |
287 | case RXRPC_CALL_REMOTELY_ABORTED: |
288 | read_unlock(&call->state_lock); | |
289 | goto aborted_call; | |
290 | default: | |
291 | rxrpc_get_call(call); | |
292 | read_unlock(&call->state_lock); | |
293 | goto extant_call; | |
294 | } | |
295 | } | |
296 | ||
297 | if (call) { | |
298 | /* it seems the channel is still in use from the previous call | |
299 | * - ditch the old binding if its call is now complete */ | |
300 | _debug("CALL: %u { %s }", | |
301 | call->debug_id, rxrpc_call_states[call->state]); | |
302 | ||
303 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
304 | conn->channels[call->channel] = NULL; | |
305 | } else { | |
306 | write_unlock_bh(&conn->lock); | |
307 | kmem_cache_free(rxrpc_call_jar, candidate); | |
308 | _leave(" = -EBUSY"); | |
309 | return ERR_PTR(-EBUSY); | |
310 | } | |
311 | } | |
312 | ||
313 | /* check the call number isn't duplicate */ | |
314 | _debug("check dup"); | |
315 | call_id = hdr->callNumber; | |
316 | p = &conn->calls.rb_node; | |
317 | parent = NULL; | |
318 | while (*p) { | |
319 | parent = *p; | |
320 | call = rb_entry(parent, struct rxrpc_call, conn_node); | |
321 | ||
322 | if (call_id < call->call_id) | |
323 | p = &(*p)->rb_left; | |
324 | else if (call_id > call->call_id) | |
325 | p = &(*p)->rb_right; | |
326 | else | |
327 | goto old_call; | |
328 | } | |
329 | ||
330 | /* make the call available */ | |
331 | _debug("new call"); | |
332 | call = candidate; | |
333 | candidate = NULL; | |
334 | rb_link_node(&call->conn_node, parent, p); | |
335 | rb_insert_color(&call->conn_node, &conn->calls); | |
336 | conn->channels[call->channel] = call; | |
337 | sock_hold(&rx->sk); | |
338 | atomic_inc(&conn->usage); | |
339 | write_unlock_bh(&conn->lock); | |
340 | ||
341 | spin_lock(&conn->trans->peer->lock); | |
342 | list_add(&call->error_link, &conn->trans->peer->error_targets); | |
343 | spin_unlock(&conn->trans->peer->lock); | |
344 | ||
345 | write_lock_bh(&rxrpc_call_lock); | |
346 | list_add_tail(&call->link, &rxrpc_calls); | |
347 | write_unlock_bh(&rxrpc_call_lock); | |
348 | ||
349 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); | |
350 | ||
351 | call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ; | |
352 | add_timer(&call->lifetimer); | |
353 | _leave(" = %p {%d} [new]", call, call->debug_id); | |
354 | return call; | |
355 | ||
356 | extant_call: | |
357 | write_unlock_bh(&conn->lock); | |
358 | kmem_cache_free(rxrpc_call_jar, candidate); | |
359 | _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1); | |
360 | return call; | |
361 | ||
362 | aborted_call: | |
363 | write_unlock_bh(&conn->lock); | |
364 | kmem_cache_free(rxrpc_call_jar, candidate); | |
365 | _leave(" = -ECONNABORTED"); | |
366 | return ERR_PTR(-ECONNABORTED); | |
367 | ||
368 | old_call: | |
369 | write_unlock_bh(&conn->lock); | |
370 | kmem_cache_free(rxrpc_call_jar, candidate); | |
371 | _leave(" = -ECONNRESET [old]"); | |
372 | return ERR_PTR(-ECONNRESET); | |
373 | } | |
374 | ||
375 | /* | |
376 | * find an extant server call | |
377 | * - called in process context with IRQs enabled | |
378 | */ | |
379 | struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *rx, | |
380 | unsigned long user_call_ID) | |
381 | { | |
382 | struct rxrpc_call *call; | |
383 | struct rb_node *p; | |
384 | ||
385 | _enter("%p,%lx", rx, user_call_ID); | |
386 | ||
387 | /* search the extant calls for one that matches the specified user | |
388 | * ID */ | |
389 | read_lock(&rx->call_lock); | |
390 | ||
391 | p = rx->calls.rb_node; | |
392 | while (p) { | |
393 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
394 | ||
395 | if (user_call_ID < call->user_call_ID) | |
396 | p = p->rb_left; | |
397 | else if (user_call_ID > call->user_call_ID) | |
398 | p = p->rb_right; | |
399 | else | |
400 | goto found_extant_call; | |
401 | } | |
402 | ||
403 | read_unlock(&rx->call_lock); | |
404 | _leave(" = NULL"); | |
405 | return NULL; | |
406 | ||
407 | /* we found the call in the list immediately */ | |
408 | found_extant_call: | |
409 | rxrpc_get_call(call); | |
410 | read_unlock(&rx->call_lock); | |
411 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); | |
412 | return call; | |
413 | } | |
414 | ||
415 | /* | |
416 | * detach a call from a socket and set up for release | |
417 | */ | |
418 | void rxrpc_release_call(struct rxrpc_call *call) | |
419 | { | |
651350d1 | 420 | struct rxrpc_connection *conn = call->conn; |
17926a79 DH |
421 | struct rxrpc_sock *rx = call->socket; |
422 | ||
423 | _enter("{%d,%d,%d,%d}", | |
424 | call->debug_id, atomic_read(&call->usage), | |
425 | atomic_read(&call->ackr_not_idle), | |
426 | call->rx_first_oos); | |
427 | ||
428 | spin_lock_bh(&call->lock); | |
429 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
430 | BUG(); | |
431 | spin_unlock_bh(&call->lock); | |
432 | ||
433 | /* dissociate from the socket | |
434 | * - the socket's ref on the call is passed to the death timer | |
435 | */ | |
651350d1 | 436 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); |
17926a79 DH |
437 | |
438 | write_lock_bh(&rx->call_lock); | |
439 | if (!list_empty(&call->accept_link)) { | |
440 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", | |
441 | call, call->events, call->flags); | |
442 | ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags)); | |
443 | list_del_init(&call->accept_link); | |
444 | sk_acceptq_removed(&rx->sk); | |
445 | } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
446 | rb_erase(&call->sock_node, &rx->calls); | |
447 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
448 | clear_bit(RXRPC_CALL_HAS_USERID, &call->flags); | |
449 | } | |
450 | write_unlock_bh(&rx->call_lock); | |
451 | ||
17926a79 | 452 | /* free up the channel for reuse */ |
651350d1 DH |
453 | spin_lock(&conn->trans->client_lock); |
454 | write_lock_bh(&conn->lock); | |
455 | write_lock(&call->state_lock); | |
456 | ||
457 | if (conn->channels[call->channel] == call) | |
458 | conn->channels[call->channel] = NULL; | |
459 | ||
460 | if (conn->out_clientflag && conn->bundle) { | |
461 | conn->avail_calls++; | |
462 | switch (conn->avail_calls) { | |
463 | case 1: | |
464 | list_move_tail(&conn->bundle_link, | |
465 | &conn->bundle->avail_conns); | |
466 | case 2 ... RXRPC_MAXCALLS - 1: | |
467 | ASSERT(conn->channels[0] == NULL || | |
468 | conn->channels[1] == NULL || | |
469 | conn->channels[2] == NULL || | |
470 | conn->channels[3] == NULL); | |
471 | break; | |
472 | case RXRPC_MAXCALLS: | |
473 | list_move_tail(&conn->bundle_link, | |
474 | &conn->bundle->unused_conns); | |
475 | ASSERT(conn->channels[0] == NULL && | |
476 | conn->channels[1] == NULL && | |
477 | conn->channels[2] == NULL && | |
478 | conn->channels[3] == NULL); | |
479 | break; | |
480 | default: | |
481 | printk(KERN_ERR "RxRPC: conn->avail_calls=%d\n", | |
482 | conn->avail_calls); | |
483 | BUG(); | |
484 | } | |
17926a79 DH |
485 | } |
486 | ||
651350d1 | 487 | spin_unlock(&conn->trans->client_lock); |
17926a79 DH |
488 | |
489 | if (call->state < RXRPC_CALL_COMPLETE && | |
490 | call->state != RXRPC_CALL_CLIENT_FINAL_ACK) { | |
491 | _debug("+++ ABORTING STATE %d +++\n", call->state); | |
492 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
493 | call->abort_code = RX_CALL_DEAD; | |
494 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
651350d1 | 495 | rxrpc_queue_call(call); |
17926a79 DH |
496 | } |
497 | write_unlock(&call->state_lock); | |
651350d1 | 498 | write_unlock_bh(&conn->lock); |
17926a79 | 499 | |
651350d1 | 500 | /* clean up the Rx queue */ |
17926a79 DH |
501 | if (!skb_queue_empty(&call->rx_queue) || |
502 | !skb_queue_empty(&call->rx_oos_queue)) { | |
503 | struct rxrpc_skb_priv *sp; | |
504 | struct sk_buff *skb; | |
505 | ||
506 | _debug("purge Rx queues"); | |
507 | ||
508 | spin_lock_bh(&call->lock); | |
509 | while ((skb = skb_dequeue(&call->rx_queue)) || | |
510 | (skb = skb_dequeue(&call->rx_oos_queue))) { | |
511 | sp = rxrpc_skb(skb); | |
512 | if (sp->call) { | |
513 | ASSERTCMP(sp->call, ==, call); | |
514 | rxrpc_put_call(call); | |
515 | sp->call = NULL; | |
516 | } | |
517 | skb->destructor = NULL; | |
518 | spin_unlock_bh(&call->lock); | |
519 | ||
520 | _debug("- zap %s %%%u #%u", | |
521 | rxrpc_pkts[sp->hdr.type], | |
522 | ntohl(sp->hdr.serial), | |
523 | ntohl(sp->hdr.seq)); | |
524 | rxrpc_free_skb(skb); | |
525 | spin_lock_bh(&call->lock); | |
526 | } | |
527 | spin_unlock_bh(&call->lock); | |
528 | ||
529 | ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE); | |
530 | } | |
531 | ||
532 | del_timer_sync(&call->resend_timer); | |
533 | del_timer_sync(&call->ack_timer); | |
534 | del_timer_sync(&call->lifetimer); | |
535 | call->deadspan.expires = jiffies + rxrpc_dead_call_timeout * HZ; | |
536 | add_timer(&call->deadspan); | |
537 | ||
538 | _leave(""); | |
539 | } | |
540 | ||
541 | /* | |
542 | * handle a dead call being ready for reaping | |
543 | */ | |
544 | static void rxrpc_dead_call_expired(unsigned long _call) | |
545 | { | |
546 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
547 | ||
548 | _enter("{%d}", call->debug_id); | |
549 | ||
550 | write_lock_bh(&call->state_lock); | |
551 | call->state = RXRPC_CALL_DEAD; | |
552 | write_unlock_bh(&call->state_lock); | |
553 | rxrpc_put_call(call); | |
554 | } | |
555 | ||
556 | /* | |
557 | * mark a call as to be released, aborting it if it's still in progress | |
558 | * - called with softirqs disabled | |
559 | */ | |
560 | static void rxrpc_mark_call_released(struct rxrpc_call *call) | |
561 | { | |
562 | bool sched; | |
563 | ||
564 | write_lock(&call->state_lock); | |
565 | if (call->state < RXRPC_CALL_DEAD) { | |
566 | sched = false; | |
567 | if (call->state < RXRPC_CALL_COMPLETE) { | |
568 | _debug("abort call %p", call); | |
569 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
570 | call->abort_code = RX_CALL_DEAD; | |
571 | if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) | |
572 | sched = true; | |
573 | } | |
574 | if (!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) | |
575 | sched = true; | |
576 | if (sched) | |
651350d1 | 577 | rxrpc_queue_call(call); |
17926a79 DH |
578 | } |
579 | write_unlock(&call->state_lock); | |
580 | } | |
581 | ||
582 | /* | |
583 | * release all the calls associated with a socket | |
584 | */ | |
585 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
586 | { | |
587 | struct rxrpc_call *call; | |
588 | struct rb_node *p; | |
589 | ||
590 | _enter("%p", rx); | |
591 | ||
592 | read_lock_bh(&rx->call_lock); | |
593 | ||
594 | /* mark all the calls as no longer wanting incoming packets */ | |
595 | for (p = rb_first(&rx->calls); p; p = rb_next(p)) { | |
596 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
597 | rxrpc_mark_call_released(call); | |
598 | } | |
599 | ||
600 | /* kill the not-yet-accepted incoming calls */ | |
601 | list_for_each_entry(call, &rx->secureq, accept_link) { | |
602 | rxrpc_mark_call_released(call); | |
603 | } | |
604 | ||
605 | list_for_each_entry(call, &rx->acceptq, accept_link) { | |
606 | rxrpc_mark_call_released(call); | |
607 | } | |
608 | ||
609 | read_unlock_bh(&rx->call_lock); | |
610 | _leave(""); | |
611 | } | |
612 | ||
613 | /* | |
614 | * release a call | |
615 | */ | |
616 | void __rxrpc_put_call(struct rxrpc_call *call) | |
617 | { | |
618 | ASSERT(call != NULL); | |
619 | ||
620 | _enter("%p{u=%d}", call, atomic_read(&call->usage)); | |
621 | ||
622 | ASSERTCMP(atomic_read(&call->usage), >, 0); | |
623 | ||
624 | if (atomic_dec_and_test(&call->usage)) { | |
625 | _debug("call %d dead", call->debug_id); | |
626 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
651350d1 | 627 | rxrpc_queue_work(&call->destroyer); |
17926a79 DH |
628 | } |
629 | _leave(""); | |
630 | } | |
631 | ||
632 | /* | |
633 | * clean up a call | |
634 | */ | |
635 | static void rxrpc_cleanup_call(struct rxrpc_call *call) | |
636 | { | |
637 | _net("DESTROY CALL %d", call->debug_id); | |
638 | ||
639 | ASSERT(call->socket); | |
640 | ||
641 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); | |
642 | ||
643 | del_timer_sync(&call->lifetimer); | |
644 | del_timer_sync(&call->deadspan); | |
645 | del_timer_sync(&call->ack_timer); | |
646 | del_timer_sync(&call->resend_timer); | |
647 | ||
648 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); | |
649 | ASSERTCMP(call->events, ==, 0); | |
650 | if (work_pending(&call->processor)) { | |
651 | _debug("defer destroy"); | |
651350d1 | 652 | rxrpc_queue_work(&call->destroyer); |
17926a79 DH |
653 | return; |
654 | } | |
655 | ||
656 | if (call->conn) { | |
657 | spin_lock(&call->conn->trans->peer->lock); | |
658 | list_del(&call->error_link); | |
659 | spin_unlock(&call->conn->trans->peer->lock); | |
660 | ||
661 | write_lock_bh(&call->conn->lock); | |
662 | rb_erase(&call->conn_node, &call->conn->calls); | |
663 | write_unlock_bh(&call->conn->lock); | |
664 | rxrpc_put_connection(call->conn); | |
665 | } | |
666 | ||
667 | if (call->acks_window) { | |
668 | _debug("kill Tx window %d", | |
669 | CIRC_CNT(call->acks_head, call->acks_tail, | |
670 | call->acks_winsz)); | |
671 | smp_mb(); | |
672 | while (CIRC_CNT(call->acks_head, call->acks_tail, | |
673 | call->acks_winsz) > 0) { | |
674 | struct rxrpc_skb_priv *sp; | |
675 | unsigned long _skb; | |
676 | ||
677 | _skb = call->acks_window[call->acks_tail] & ~1; | |
678 | sp = rxrpc_skb((struct sk_buff *) _skb); | |
679 | _debug("+++ clear Tx %u", ntohl(sp->hdr.seq)); | |
680 | rxrpc_free_skb((struct sk_buff *) _skb); | |
681 | call->acks_tail = | |
682 | (call->acks_tail + 1) & (call->acks_winsz - 1); | |
683 | } | |
684 | ||
685 | kfree(call->acks_window); | |
686 | } | |
687 | ||
688 | rxrpc_free_skb(call->tx_pending); | |
689 | ||
690 | rxrpc_purge_queue(&call->rx_queue); | |
691 | ASSERT(skb_queue_empty(&call->rx_oos_queue)); | |
692 | sock_put(&call->socket->sk); | |
693 | kmem_cache_free(rxrpc_call_jar, call); | |
694 | } | |
695 | ||
696 | /* | |
697 | * destroy a call | |
698 | */ | |
699 | static void rxrpc_destroy_call(struct work_struct *work) | |
700 | { | |
701 | struct rxrpc_call *call = | |
702 | container_of(work, struct rxrpc_call, destroyer); | |
703 | ||
704 | _enter("%p{%d,%d,%p}", | |
705 | call, atomic_read(&call->usage), call->channel, call->conn); | |
706 | ||
707 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
708 | ||
709 | write_lock_bh(&rxrpc_call_lock); | |
710 | list_del_init(&call->link); | |
711 | write_unlock_bh(&rxrpc_call_lock); | |
712 | ||
713 | rxrpc_cleanup_call(call); | |
714 | _leave(""); | |
715 | } | |
716 | ||
717 | /* | |
718 | * preemptively destroy all the call records from a transport endpoint rather | |
719 | * than waiting for them to time out | |
720 | */ | |
721 | void __exit rxrpc_destroy_all_calls(void) | |
722 | { | |
723 | struct rxrpc_call *call; | |
724 | ||
725 | _enter(""); | |
726 | write_lock_bh(&rxrpc_call_lock); | |
727 | ||
728 | while (!list_empty(&rxrpc_calls)) { | |
729 | call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); | |
730 | _debug("Zapping call %p", call); | |
731 | ||
732 | list_del_init(&call->link); | |
733 | ||
734 | switch (atomic_read(&call->usage)) { | |
735 | case 0: | |
736 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
737 | break; | |
738 | case 1: | |
739 | if (del_timer_sync(&call->deadspan) != 0 && | |
740 | call->state != RXRPC_CALL_DEAD) | |
741 | rxrpc_dead_call_expired((unsigned long) call); | |
742 | if (call->state != RXRPC_CALL_DEAD) | |
743 | break; | |
744 | default: | |
745 | printk(KERN_ERR "RXRPC:" | |
746 | " Call %p still in use (%d,%d,%s,%lx,%lx)!\n", | |
747 | call, atomic_read(&call->usage), | |
748 | atomic_read(&call->ackr_not_idle), | |
749 | rxrpc_call_states[call->state], | |
750 | call->flags, call->events); | |
751 | if (!skb_queue_empty(&call->rx_queue)) | |
752 | printk(KERN_ERR"RXRPC: Rx queue occupied\n"); | |
753 | if (!skb_queue_empty(&call->rx_oos_queue)) | |
754 | printk(KERN_ERR"RXRPC: OOS queue occupied\n"); | |
755 | break; | |
756 | } | |
757 | ||
758 | write_unlock_bh(&rxrpc_call_lock); | |
759 | cond_resched(); | |
760 | write_lock_bh(&rxrpc_call_lock); | |
761 | } | |
762 | ||
763 | write_unlock_bh(&rxrpc_call_lock); | |
764 | _leave(""); | |
765 | } | |
766 | ||
767 | /* | |
768 | * handle call lifetime being exceeded | |
769 | */ | |
770 | static void rxrpc_call_life_expired(unsigned long _call) | |
771 | { | |
772 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
773 | ||
774 | if (call->state >= RXRPC_CALL_COMPLETE) | |
775 | return; | |
776 | ||
777 | _enter("{%d}", call->debug_id); | |
778 | read_lock_bh(&call->state_lock); | |
779 | if (call->state < RXRPC_CALL_COMPLETE) { | |
780 | set_bit(RXRPC_CALL_LIFE_TIMER, &call->events); | |
651350d1 | 781 | rxrpc_queue_call(call); |
17926a79 DH |
782 | } |
783 | read_unlock_bh(&call->state_lock); | |
784 | } | |
785 | ||
786 | /* | |
787 | * handle resend timer expiry | |
788 | */ | |
789 | static void rxrpc_resend_time_expired(unsigned long _call) | |
790 | { | |
791 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
792 | ||
793 | _enter("{%d}", call->debug_id); | |
794 | ||
795 | if (call->state >= RXRPC_CALL_COMPLETE) | |
796 | return; | |
797 | ||
798 | read_lock_bh(&call->state_lock); | |
799 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
800 | if (call->state < RXRPC_CALL_COMPLETE && | |
801 | !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
651350d1 | 802 | rxrpc_queue_call(call); |
17926a79 DH |
803 | read_unlock_bh(&call->state_lock); |
804 | } | |
805 | ||
806 | /* | |
807 | * handle ACK timer expiry | |
808 | */ | |
809 | static void rxrpc_ack_time_expired(unsigned long _call) | |
810 | { | |
811 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
812 | ||
813 | _enter("{%d}", call->debug_id); | |
814 | ||
815 | if (call->state >= RXRPC_CALL_COMPLETE) | |
816 | return; | |
817 | ||
818 | read_lock_bh(&call->state_lock); | |
819 | if (call->state < RXRPC_CALL_COMPLETE && | |
820 | !test_and_set_bit(RXRPC_CALL_ACK, &call->events)) | |
651350d1 | 821 | rxrpc_queue_call(call); |
17926a79 DH |
822 | read_unlock_bh(&call->state_lock); |
823 | } |