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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 | ||
5a0e3ad6 | 12 | #include <linux/slab.h> |
17926a79 DH |
13 | #include <linux/module.h> |
14 | #include <linux/circ_buf.h> | |
15 | #include <net/sock.h> | |
16 | #include <net/af_rxrpc.h> | |
17 | #include "ar-internal.h" | |
18 | ||
036c2e27 | 19 | const char *const rxrpc_call_states[] = { |
1f8481d1 DH |
20 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
21 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", | |
22 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", | |
23 | [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK", | |
24 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", | |
25 | [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", | |
26 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", | |
27 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", | |
28 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", | |
29 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", | |
30 | [RXRPC_CALL_COMPLETE] = "Complete", | |
31 | [RXRPC_CALL_SERVER_BUSY] = "SvBusy ", | |
32 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", | |
33 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
34 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", | |
35 | [RXRPC_CALL_DEAD] = "Dead ", | |
36 | }; | |
37 | ||
17926a79 DH |
38 | struct kmem_cache *rxrpc_call_jar; |
39 | LIST_HEAD(rxrpc_calls); | |
40 | DEFINE_RWLOCK(rxrpc_call_lock); | |
41 | static unsigned rxrpc_call_max_lifetime = 60; | |
651350d1 | 42 | static unsigned rxrpc_dead_call_timeout = 2; |
17926a79 DH |
43 | |
44 | static void rxrpc_destroy_call(struct work_struct *work); | |
45 | static void rxrpc_call_life_expired(unsigned long _call); | |
46 | static void rxrpc_dead_call_expired(unsigned long _call); | |
47 | static void rxrpc_ack_time_expired(unsigned long _call); | |
48 | static void rxrpc_resend_time_expired(unsigned long _call); | |
49 | ||
50 | /* | |
51 | * allocate a new call | |
52 | */ | |
53 | static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) | |
54 | { | |
55 | struct rxrpc_call *call; | |
56 | ||
57 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
58 | if (!call) | |
59 | return NULL; | |
60 | ||
61 | call->acks_winsz = 16; | |
62 | call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long), | |
63 | gfp); | |
64 | if (!call->acks_window) { | |
65 | kmem_cache_free(rxrpc_call_jar, call); | |
66 | return NULL; | |
67 | } | |
68 | ||
69 | setup_timer(&call->lifetimer, &rxrpc_call_life_expired, | |
70 | (unsigned long) call); | |
71 | setup_timer(&call->deadspan, &rxrpc_dead_call_expired, | |
72 | (unsigned long) call); | |
73 | setup_timer(&call->ack_timer, &rxrpc_ack_time_expired, | |
74 | (unsigned long) call); | |
75 | setup_timer(&call->resend_timer, &rxrpc_resend_time_expired, | |
76 | (unsigned long) call); | |
77 | INIT_WORK(&call->destroyer, &rxrpc_destroy_call); | |
78 | INIT_WORK(&call->processor, &rxrpc_process_call); | |
79 | INIT_LIST_HEAD(&call->accept_link); | |
80 | skb_queue_head_init(&call->rx_queue); | |
81 | skb_queue_head_init(&call->rx_oos_queue); | |
82 | init_waitqueue_head(&call->tx_waitq); | |
83 | spin_lock_init(&call->lock); | |
84 | rwlock_init(&call->state_lock); | |
85 | atomic_set(&call->usage, 1); | |
86 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); | |
87 | call->state = RXRPC_CALL_CLIENT_SEND_REQUEST; | |
88 | ||
89 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
90 | ||
91 | call->rx_data_expect = 1; | |
92 | call->rx_data_eaten = 0; | |
93 | call->rx_first_oos = 0; | |
94 | call->ackr_win_top = call->rx_data_eaten + 1 + RXRPC_MAXACKS; | |
95 | call->creation_jif = jiffies; | |
96 | return call; | |
97 | } | |
98 | ||
99 | /* | |
fd589a8f | 100 | * allocate a new client call and attempt to get a connection slot for it |
17926a79 DH |
101 | */ |
102 | static struct rxrpc_call *rxrpc_alloc_client_call( | |
103 | struct rxrpc_sock *rx, | |
104 | struct rxrpc_transport *trans, | |
105 | struct rxrpc_conn_bundle *bundle, | |
106 | gfp_t gfp) | |
107 | { | |
108 | struct rxrpc_call *call; | |
109 | int ret; | |
110 | ||
111 | _enter(""); | |
112 | ||
113 | ASSERT(rx != NULL); | |
114 | ASSERT(trans != NULL); | |
115 | ASSERT(bundle != NULL); | |
116 | ||
117 | call = rxrpc_alloc_call(gfp); | |
118 | if (!call) | |
119 | return ERR_PTR(-ENOMEM); | |
120 | ||
121 | sock_hold(&rx->sk); | |
122 | call->socket = rx; | |
123 | call->rx_data_post = 1; | |
124 | ||
125 | ret = rxrpc_connect_call(rx, trans, bundle, call, gfp); | |
126 | if (ret < 0) { | |
127 | kmem_cache_free(rxrpc_call_jar, call); | |
128 | return ERR_PTR(ret); | |
129 | } | |
130 | ||
131 | spin_lock(&call->conn->trans->peer->lock); | |
132 | list_add(&call->error_link, &call->conn->trans->peer->error_targets); | |
133 | spin_unlock(&call->conn->trans->peer->lock); | |
134 | ||
135 | call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ; | |
136 | add_timer(&call->lifetimer); | |
137 | ||
138 | _leave(" = %p", call); | |
139 | return call; | |
140 | } | |
141 | ||
142 | /* | |
143 | * set up a call for the given data | |
144 | * - called in process context with IRQs enabled | |
145 | */ | |
146 | struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx, | |
147 | struct rxrpc_transport *trans, | |
148 | struct rxrpc_conn_bundle *bundle, | |
149 | unsigned long user_call_ID, | |
150 | int create, | |
151 | gfp_t gfp) | |
152 | { | |
153 | struct rxrpc_call *call, *candidate; | |
154 | struct rb_node *p, *parent, **pp; | |
155 | ||
156 | _enter("%p,%d,%d,%lx,%d", | |
157 | rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1, | |
158 | user_call_ID, create); | |
159 | ||
160 | /* search the extant calls first for one that matches the specified | |
161 | * user ID */ | |
162 | read_lock(&rx->call_lock); | |
163 | ||
164 | p = rx->calls.rb_node; | |
165 | while (p) { | |
166 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
167 | ||
168 | if (user_call_ID < call->user_call_ID) | |
169 | p = p->rb_left; | |
170 | else if (user_call_ID > call->user_call_ID) | |
171 | p = p->rb_right; | |
172 | else | |
173 | goto found_extant_call; | |
174 | } | |
175 | ||
176 | read_unlock(&rx->call_lock); | |
177 | ||
178 | if (!create || !trans) | |
179 | return ERR_PTR(-EBADSLT); | |
180 | ||
181 | /* not yet present - create a candidate for a new record and then | |
182 | * redo the search */ | |
183 | candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp); | |
184 | if (IS_ERR(candidate)) { | |
185 | _leave(" = %ld", PTR_ERR(candidate)); | |
186 | return candidate; | |
187 | } | |
188 | ||
189 | candidate->user_call_ID = user_call_ID; | |
190 | __set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags); | |
191 | ||
192 | write_lock(&rx->call_lock); | |
193 | ||
194 | pp = &rx->calls.rb_node; | |
195 | parent = NULL; | |
196 | while (*pp) { | |
197 | parent = *pp; | |
198 | call = rb_entry(parent, struct rxrpc_call, sock_node); | |
199 | ||
200 | if (user_call_ID < call->user_call_ID) | |
201 | pp = &(*pp)->rb_left; | |
202 | else if (user_call_ID > call->user_call_ID) | |
203 | pp = &(*pp)->rb_right; | |
204 | else | |
205 | goto found_extant_second; | |
206 | } | |
207 | ||
208 | /* second search also failed; add the new call */ | |
209 | call = candidate; | |
210 | candidate = NULL; | |
211 | rxrpc_get_call(call); | |
212 | ||
213 | rb_link_node(&call->sock_node, parent, pp); | |
214 | rb_insert_color(&call->sock_node, &rx->calls); | |
215 | write_unlock(&rx->call_lock); | |
216 | ||
217 | write_lock_bh(&rxrpc_call_lock); | |
218 | list_add_tail(&call->link, &rxrpc_calls); | |
219 | write_unlock_bh(&rxrpc_call_lock); | |
220 | ||
221 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); | |
222 | ||
223 | _leave(" = %p [new]", call); | |
224 | return call; | |
225 | ||
226 | /* we found the call in the list immediately */ | |
227 | found_extant_call: | |
228 | rxrpc_get_call(call); | |
229 | read_unlock(&rx->call_lock); | |
230 | _leave(" = %p [extant %d]", call, atomic_read(&call->usage)); | |
231 | return call; | |
232 | ||
233 | /* we found the call on the second time through the list */ | |
234 | found_extant_second: | |
235 | rxrpc_get_call(call); | |
236 | write_unlock(&rx->call_lock); | |
237 | rxrpc_put_call(candidate); | |
238 | _leave(" = %p [second %d]", call, atomic_read(&call->usage)); | |
239 | return call; | |
240 | } | |
241 | ||
242 | /* | |
243 | * set up an incoming call | |
244 | * - called in process context with IRQs enabled | |
245 | */ | |
246 | struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, | |
247 | struct rxrpc_connection *conn, | |
248 | struct rxrpc_header *hdr, | |
249 | gfp_t gfp) | |
250 | { | |
251 | struct rxrpc_call *call, *candidate; | |
252 | struct rb_node **p, *parent; | |
253 | __be32 call_id; | |
254 | ||
255 | _enter(",%d,,%x", conn->debug_id, gfp); | |
256 | ||
257 | ASSERT(rx != NULL); | |
258 | ||
259 | candidate = rxrpc_alloc_call(gfp); | |
260 | if (!candidate) | |
261 | return ERR_PTR(-EBUSY); | |
262 | ||
263 | candidate->socket = rx; | |
264 | candidate->conn = conn; | |
265 | candidate->cid = hdr->cid; | |
266 | candidate->call_id = hdr->callNumber; | |
267 | candidate->channel = ntohl(hdr->cid) & RXRPC_CHANNELMASK; | |
268 | candidate->rx_data_post = 0; | |
269 | candidate->state = RXRPC_CALL_SERVER_ACCEPTING; | |
270 | if (conn->security_ix > 0) | |
271 | candidate->state = RXRPC_CALL_SERVER_SECURING; | |
272 | ||
273 | write_lock_bh(&conn->lock); | |
274 | ||
275 | /* set the channel for this call */ | |
276 | call = conn->channels[candidate->channel]; | |
277 | _debug("channel[%u] is %p", candidate->channel, call); | |
278 | if (call && call->call_id == hdr->callNumber) { | |
279 | /* already set; must've been a duplicate packet */ | |
280 | _debug("extant call [%d]", call->state); | |
281 | ASSERTCMP(call->conn, ==, conn); | |
282 | ||
283 | read_lock(&call->state_lock); | |
284 | switch (call->state) { | |
285 | case RXRPC_CALL_LOCALLY_ABORTED: | |
286 | if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) | |
651350d1 | 287 | rxrpc_queue_call(call); |
17926a79 DH |
288 | case RXRPC_CALL_REMOTELY_ABORTED: |
289 | read_unlock(&call->state_lock); | |
290 | goto aborted_call; | |
291 | default: | |
292 | rxrpc_get_call(call); | |
293 | read_unlock(&call->state_lock); | |
294 | goto extant_call; | |
295 | } | |
296 | } | |
297 | ||
298 | if (call) { | |
299 | /* it seems the channel is still in use from the previous call | |
300 | * - ditch the old binding if its call is now complete */ | |
301 | _debug("CALL: %u { %s }", | |
302 | call->debug_id, rxrpc_call_states[call->state]); | |
303 | ||
304 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
305 | conn->channels[call->channel] = NULL; | |
306 | } else { | |
307 | write_unlock_bh(&conn->lock); | |
308 | kmem_cache_free(rxrpc_call_jar, candidate); | |
309 | _leave(" = -EBUSY"); | |
310 | return ERR_PTR(-EBUSY); | |
311 | } | |
312 | } | |
313 | ||
314 | /* check the call number isn't duplicate */ | |
315 | _debug("check dup"); | |
316 | call_id = hdr->callNumber; | |
317 | p = &conn->calls.rb_node; | |
318 | parent = NULL; | |
319 | while (*p) { | |
320 | parent = *p; | |
321 | call = rb_entry(parent, struct rxrpc_call, conn_node); | |
322 | ||
323 | if (call_id < call->call_id) | |
324 | p = &(*p)->rb_left; | |
325 | else if (call_id > call->call_id) | |
326 | p = &(*p)->rb_right; | |
327 | else | |
328 | goto old_call; | |
329 | } | |
330 | ||
331 | /* make the call available */ | |
332 | _debug("new call"); | |
333 | call = candidate; | |
334 | candidate = NULL; | |
335 | rb_link_node(&call->conn_node, parent, p); | |
336 | rb_insert_color(&call->conn_node, &conn->calls); | |
337 | conn->channels[call->channel] = call; | |
338 | sock_hold(&rx->sk); | |
339 | atomic_inc(&conn->usage); | |
340 | write_unlock_bh(&conn->lock); | |
341 | ||
342 | spin_lock(&conn->trans->peer->lock); | |
343 | list_add(&call->error_link, &conn->trans->peer->error_targets); | |
344 | spin_unlock(&conn->trans->peer->lock); | |
345 | ||
346 | write_lock_bh(&rxrpc_call_lock); | |
347 | list_add_tail(&call->link, &rxrpc_calls); | |
348 | write_unlock_bh(&rxrpc_call_lock); | |
349 | ||
350 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); | |
351 | ||
352 | call->lifetimer.expires = jiffies + rxrpc_call_max_lifetime * HZ; | |
353 | add_timer(&call->lifetimer); | |
354 | _leave(" = %p {%d} [new]", call, call->debug_id); | |
355 | return call; | |
356 | ||
357 | extant_call: | |
358 | write_unlock_bh(&conn->lock); | |
359 | kmem_cache_free(rxrpc_call_jar, candidate); | |
360 | _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1); | |
361 | return call; | |
362 | ||
363 | aborted_call: | |
364 | write_unlock_bh(&conn->lock); | |
365 | kmem_cache_free(rxrpc_call_jar, candidate); | |
366 | _leave(" = -ECONNABORTED"); | |
367 | return ERR_PTR(-ECONNABORTED); | |
368 | ||
369 | old_call: | |
370 | write_unlock_bh(&conn->lock); | |
371 | kmem_cache_free(rxrpc_call_jar, candidate); | |
372 | _leave(" = -ECONNRESET [old]"); | |
373 | return ERR_PTR(-ECONNRESET); | |
374 | } | |
375 | ||
376 | /* | |
377 | * find an extant server call | |
378 | * - called in process context with IRQs enabled | |
379 | */ | |
380 | struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *rx, | |
381 | unsigned long user_call_ID) | |
382 | { | |
383 | struct rxrpc_call *call; | |
384 | struct rb_node *p; | |
385 | ||
386 | _enter("%p,%lx", rx, user_call_ID); | |
387 | ||
388 | /* search the extant calls for one that matches the specified user | |
389 | * ID */ | |
390 | read_lock(&rx->call_lock); | |
391 | ||
392 | p = rx->calls.rb_node; | |
393 | while (p) { | |
394 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
395 | ||
396 | if (user_call_ID < call->user_call_ID) | |
397 | p = p->rb_left; | |
398 | else if (user_call_ID > call->user_call_ID) | |
399 | p = p->rb_right; | |
400 | else | |
401 | goto found_extant_call; | |
402 | } | |
403 | ||
404 | read_unlock(&rx->call_lock); | |
405 | _leave(" = NULL"); | |
406 | return NULL; | |
407 | ||
408 | /* we found the call in the list immediately */ | |
409 | found_extant_call: | |
410 | rxrpc_get_call(call); | |
411 | read_unlock(&rx->call_lock); | |
412 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); | |
413 | return call; | |
414 | } | |
415 | ||
416 | /* | |
417 | * detach a call from a socket and set up for release | |
418 | */ | |
419 | void rxrpc_release_call(struct rxrpc_call *call) | |
420 | { | |
651350d1 | 421 | struct rxrpc_connection *conn = call->conn; |
17926a79 DH |
422 | struct rxrpc_sock *rx = call->socket; |
423 | ||
424 | _enter("{%d,%d,%d,%d}", | |
425 | call->debug_id, atomic_read(&call->usage), | |
426 | atomic_read(&call->ackr_not_idle), | |
427 | call->rx_first_oos); | |
428 | ||
429 | spin_lock_bh(&call->lock); | |
430 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
431 | BUG(); | |
432 | spin_unlock_bh(&call->lock); | |
433 | ||
434 | /* dissociate from the socket | |
435 | * - the socket's ref on the call is passed to the death timer | |
436 | */ | |
651350d1 | 437 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); |
17926a79 DH |
438 | |
439 | write_lock_bh(&rx->call_lock); | |
440 | if (!list_empty(&call->accept_link)) { | |
441 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", | |
442 | call, call->events, call->flags); | |
443 | ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags)); | |
444 | list_del_init(&call->accept_link); | |
445 | sk_acceptq_removed(&rx->sk); | |
446 | } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
447 | rb_erase(&call->sock_node, &rx->calls); | |
448 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
449 | clear_bit(RXRPC_CALL_HAS_USERID, &call->flags); | |
450 | } | |
451 | write_unlock_bh(&rx->call_lock); | |
452 | ||
17926a79 | 453 | /* free up the channel for reuse */ |
651350d1 DH |
454 | spin_lock(&conn->trans->client_lock); |
455 | write_lock_bh(&conn->lock); | |
456 | write_lock(&call->state_lock); | |
457 | ||
458 | if (conn->channels[call->channel] == call) | |
459 | conn->channels[call->channel] = NULL; | |
460 | ||
461 | if (conn->out_clientflag && conn->bundle) { | |
462 | conn->avail_calls++; | |
463 | switch (conn->avail_calls) { | |
464 | case 1: | |
465 | list_move_tail(&conn->bundle_link, | |
466 | &conn->bundle->avail_conns); | |
467 | case 2 ... RXRPC_MAXCALLS - 1: | |
468 | ASSERT(conn->channels[0] == NULL || | |
469 | conn->channels[1] == NULL || | |
470 | conn->channels[2] == NULL || | |
471 | conn->channels[3] == NULL); | |
472 | break; | |
473 | case RXRPC_MAXCALLS: | |
474 | list_move_tail(&conn->bundle_link, | |
475 | &conn->bundle->unused_conns); | |
476 | ASSERT(conn->channels[0] == NULL && | |
477 | conn->channels[1] == NULL && | |
478 | conn->channels[2] == NULL && | |
479 | conn->channels[3] == NULL); | |
480 | break; | |
481 | default: | |
482 | printk(KERN_ERR "RxRPC: conn->avail_calls=%d\n", | |
483 | conn->avail_calls); | |
484 | BUG(); | |
485 | } | |
17926a79 DH |
486 | } |
487 | ||
651350d1 | 488 | spin_unlock(&conn->trans->client_lock); |
17926a79 DH |
489 | |
490 | if (call->state < RXRPC_CALL_COMPLETE && | |
491 | call->state != RXRPC_CALL_CLIENT_FINAL_ACK) { | |
492 | _debug("+++ ABORTING STATE %d +++\n", call->state); | |
493 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
494 | call->abort_code = RX_CALL_DEAD; | |
495 | set_bit(RXRPC_CALL_ABORT, &call->events); | |
651350d1 | 496 | rxrpc_queue_call(call); |
17926a79 DH |
497 | } |
498 | write_unlock(&call->state_lock); | |
651350d1 | 499 | write_unlock_bh(&conn->lock); |
17926a79 | 500 | |
651350d1 | 501 | /* clean up the Rx queue */ |
17926a79 DH |
502 | if (!skb_queue_empty(&call->rx_queue) || |
503 | !skb_queue_empty(&call->rx_oos_queue)) { | |
504 | struct rxrpc_skb_priv *sp; | |
505 | struct sk_buff *skb; | |
506 | ||
507 | _debug("purge Rx queues"); | |
508 | ||
509 | spin_lock_bh(&call->lock); | |
510 | while ((skb = skb_dequeue(&call->rx_queue)) || | |
511 | (skb = skb_dequeue(&call->rx_oos_queue))) { | |
512 | sp = rxrpc_skb(skb); | |
513 | if (sp->call) { | |
514 | ASSERTCMP(sp->call, ==, call); | |
515 | rxrpc_put_call(call); | |
516 | sp->call = NULL; | |
517 | } | |
518 | skb->destructor = NULL; | |
519 | spin_unlock_bh(&call->lock); | |
520 | ||
521 | _debug("- zap %s %%%u #%u", | |
522 | rxrpc_pkts[sp->hdr.type], | |
523 | ntohl(sp->hdr.serial), | |
524 | ntohl(sp->hdr.seq)); | |
525 | rxrpc_free_skb(skb); | |
526 | spin_lock_bh(&call->lock); | |
527 | } | |
528 | spin_unlock_bh(&call->lock); | |
529 | ||
530 | ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE); | |
531 | } | |
532 | ||
533 | del_timer_sync(&call->resend_timer); | |
534 | del_timer_sync(&call->ack_timer); | |
535 | del_timer_sync(&call->lifetimer); | |
536 | call->deadspan.expires = jiffies + rxrpc_dead_call_timeout * HZ; | |
537 | add_timer(&call->deadspan); | |
538 | ||
539 | _leave(""); | |
540 | } | |
541 | ||
542 | /* | |
543 | * handle a dead call being ready for reaping | |
544 | */ | |
545 | static void rxrpc_dead_call_expired(unsigned long _call) | |
546 | { | |
547 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
548 | ||
549 | _enter("{%d}", call->debug_id); | |
550 | ||
551 | write_lock_bh(&call->state_lock); | |
552 | call->state = RXRPC_CALL_DEAD; | |
553 | write_unlock_bh(&call->state_lock); | |
554 | rxrpc_put_call(call); | |
555 | } | |
556 | ||
557 | /* | |
558 | * mark a call as to be released, aborting it if it's still in progress | |
559 | * - called with softirqs disabled | |
560 | */ | |
561 | static void rxrpc_mark_call_released(struct rxrpc_call *call) | |
562 | { | |
563 | bool sched; | |
564 | ||
565 | write_lock(&call->state_lock); | |
566 | if (call->state < RXRPC_CALL_DEAD) { | |
567 | sched = false; | |
568 | if (call->state < RXRPC_CALL_COMPLETE) { | |
569 | _debug("abort call %p", call); | |
570 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
571 | call->abort_code = RX_CALL_DEAD; | |
572 | if (!test_and_set_bit(RXRPC_CALL_ABORT, &call->events)) | |
573 | sched = true; | |
574 | } | |
575 | if (!test_and_set_bit(RXRPC_CALL_RELEASE, &call->events)) | |
576 | sched = true; | |
577 | if (sched) | |
651350d1 | 578 | rxrpc_queue_call(call); |
17926a79 DH |
579 | } |
580 | write_unlock(&call->state_lock); | |
581 | } | |
582 | ||
583 | /* | |
584 | * release all the calls associated with a socket | |
585 | */ | |
586 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
587 | { | |
588 | struct rxrpc_call *call; | |
589 | struct rb_node *p; | |
590 | ||
591 | _enter("%p", rx); | |
592 | ||
593 | read_lock_bh(&rx->call_lock); | |
594 | ||
595 | /* mark all the calls as no longer wanting incoming packets */ | |
596 | for (p = rb_first(&rx->calls); p; p = rb_next(p)) { | |
597 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
598 | rxrpc_mark_call_released(call); | |
599 | } | |
600 | ||
601 | /* kill the not-yet-accepted incoming calls */ | |
602 | list_for_each_entry(call, &rx->secureq, accept_link) { | |
603 | rxrpc_mark_call_released(call); | |
604 | } | |
605 | ||
606 | list_for_each_entry(call, &rx->acceptq, accept_link) { | |
607 | rxrpc_mark_call_released(call); | |
608 | } | |
609 | ||
610 | read_unlock_bh(&rx->call_lock); | |
611 | _leave(""); | |
612 | } | |
613 | ||
614 | /* | |
615 | * release a call | |
616 | */ | |
617 | void __rxrpc_put_call(struct rxrpc_call *call) | |
618 | { | |
619 | ASSERT(call != NULL); | |
620 | ||
621 | _enter("%p{u=%d}", call, atomic_read(&call->usage)); | |
622 | ||
623 | ASSERTCMP(atomic_read(&call->usage), >, 0); | |
624 | ||
625 | if (atomic_dec_and_test(&call->usage)) { | |
626 | _debug("call %d dead", call->debug_id); | |
627 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
651350d1 | 628 | rxrpc_queue_work(&call->destroyer); |
17926a79 DH |
629 | } |
630 | _leave(""); | |
631 | } | |
632 | ||
633 | /* | |
634 | * clean up a call | |
635 | */ | |
636 | static void rxrpc_cleanup_call(struct rxrpc_call *call) | |
637 | { | |
638 | _net("DESTROY CALL %d", call->debug_id); | |
639 | ||
640 | ASSERT(call->socket); | |
641 | ||
642 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); | |
643 | ||
644 | del_timer_sync(&call->lifetimer); | |
645 | del_timer_sync(&call->deadspan); | |
646 | del_timer_sync(&call->ack_timer); | |
647 | del_timer_sync(&call->resend_timer); | |
648 | ||
649 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); | |
650 | ASSERTCMP(call->events, ==, 0); | |
651 | if (work_pending(&call->processor)) { | |
652 | _debug("defer destroy"); | |
651350d1 | 653 | rxrpc_queue_work(&call->destroyer); |
17926a79 DH |
654 | return; |
655 | } | |
656 | ||
657 | if (call->conn) { | |
658 | spin_lock(&call->conn->trans->peer->lock); | |
659 | list_del(&call->error_link); | |
660 | spin_unlock(&call->conn->trans->peer->lock); | |
661 | ||
662 | write_lock_bh(&call->conn->lock); | |
663 | rb_erase(&call->conn_node, &call->conn->calls); | |
664 | write_unlock_bh(&call->conn->lock); | |
665 | rxrpc_put_connection(call->conn); | |
666 | } | |
667 | ||
668 | if (call->acks_window) { | |
669 | _debug("kill Tx window %d", | |
670 | CIRC_CNT(call->acks_head, call->acks_tail, | |
671 | call->acks_winsz)); | |
672 | smp_mb(); | |
673 | while (CIRC_CNT(call->acks_head, call->acks_tail, | |
674 | call->acks_winsz) > 0) { | |
675 | struct rxrpc_skb_priv *sp; | |
676 | unsigned long _skb; | |
677 | ||
678 | _skb = call->acks_window[call->acks_tail] & ~1; | |
679 | sp = rxrpc_skb((struct sk_buff *) _skb); | |
680 | _debug("+++ clear Tx %u", ntohl(sp->hdr.seq)); | |
681 | rxrpc_free_skb((struct sk_buff *) _skb); | |
682 | call->acks_tail = | |
683 | (call->acks_tail + 1) & (call->acks_winsz - 1); | |
684 | } | |
685 | ||
686 | kfree(call->acks_window); | |
687 | } | |
688 | ||
689 | rxrpc_free_skb(call->tx_pending); | |
690 | ||
691 | rxrpc_purge_queue(&call->rx_queue); | |
692 | ASSERT(skb_queue_empty(&call->rx_oos_queue)); | |
693 | sock_put(&call->socket->sk); | |
694 | kmem_cache_free(rxrpc_call_jar, call); | |
695 | } | |
696 | ||
697 | /* | |
698 | * destroy a call | |
699 | */ | |
700 | static void rxrpc_destroy_call(struct work_struct *work) | |
701 | { | |
702 | struct rxrpc_call *call = | |
703 | container_of(work, struct rxrpc_call, destroyer); | |
704 | ||
705 | _enter("%p{%d,%d,%p}", | |
706 | call, atomic_read(&call->usage), call->channel, call->conn); | |
707 | ||
708 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
709 | ||
710 | write_lock_bh(&rxrpc_call_lock); | |
711 | list_del_init(&call->link); | |
712 | write_unlock_bh(&rxrpc_call_lock); | |
713 | ||
714 | rxrpc_cleanup_call(call); | |
715 | _leave(""); | |
716 | } | |
717 | ||
718 | /* | |
719 | * preemptively destroy all the call records from a transport endpoint rather | |
720 | * than waiting for them to time out | |
721 | */ | |
722 | void __exit rxrpc_destroy_all_calls(void) | |
723 | { | |
724 | struct rxrpc_call *call; | |
725 | ||
726 | _enter(""); | |
727 | write_lock_bh(&rxrpc_call_lock); | |
728 | ||
729 | while (!list_empty(&rxrpc_calls)) { | |
730 | call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); | |
731 | _debug("Zapping call %p", call); | |
732 | ||
733 | list_del_init(&call->link); | |
734 | ||
735 | switch (atomic_read(&call->usage)) { | |
736 | case 0: | |
737 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
738 | break; | |
739 | case 1: | |
740 | if (del_timer_sync(&call->deadspan) != 0 && | |
741 | call->state != RXRPC_CALL_DEAD) | |
742 | rxrpc_dead_call_expired((unsigned long) call); | |
743 | if (call->state != RXRPC_CALL_DEAD) | |
744 | break; | |
745 | default: | |
746 | printk(KERN_ERR "RXRPC:" | |
747 | " Call %p still in use (%d,%d,%s,%lx,%lx)!\n", | |
748 | call, atomic_read(&call->usage), | |
749 | atomic_read(&call->ackr_not_idle), | |
750 | rxrpc_call_states[call->state], | |
751 | call->flags, call->events); | |
752 | if (!skb_queue_empty(&call->rx_queue)) | |
753 | printk(KERN_ERR"RXRPC: Rx queue occupied\n"); | |
754 | if (!skb_queue_empty(&call->rx_oos_queue)) | |
755 | printk(KERN_ERR"RXRPC: OOS queue occupied\n"); | |
756 | break; | |
757 | } | |
758 | ||
759 | write_unlock_bh(&rxrpc_call_lock); | |
760 | cond_resched(); | |
761 | write_lock_bh(&rxrpc_call_lock); | |
762 | } | |
763 | ||
764 | write_unlock_bh(&rxrpc_call_lock); | |
765 | _leave(""); | |
766 | } | |
767 | ||
768 | /* | |
769 | * handle call lifetime being exceeded | |
770 | */ | |
771 | static void rxrpc_call_life_expired(unsigned long _call) | |
772 | { | |
773 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
774 | ||
775 | if (call->state >= RXRPC_CALL_COMPLETE) | |
776 | return; | |
777 | ||
778 | _enter("{%d}", call->debug_id); | |
779 | read_lock_bh(&call->state_lock); | |
780 | if (call->state < RXRPC_CALL_COMPLETE) { | |
781 | set_bit(RXRPC_CALL_LIFE_TIMER, &call->events); | |
651350d1 | 782 | rxrpc_queue_call(call); |
17926a79 DH |
783 | } |
784 | read_unlock_bh(&call->state_lock); | |
785 | } | |
786 | ||
787 | /* | |
788 | * handle resend timer expiry | |
789 | */ | |
790 | static void rxrpc_resend_time_expired(unsigned long _call) | |
791 | { | |
792 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
793 | ||
794 | _enter("{%d}", call->debug_id); | |
795 | ||
796 | if (call->state >= RXRPC_CALL_COMPLETE) | |
797 | return; | |
798 | ||
799 | read_lock_bh(&call->state_lock); | |
800 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); | |
801 | if (call->state < RXRPC_CALL_COMPLETE && | |
802 | !test_and_set_bit(RXRPC_CALL_RESEND_TIMER, &call->events)) | |
651350d1 | 803 | rxrpc_queue_call(call); |
17926a79 DH |
804 | read_unlock_bh(&call->state_lock); |
805 | } | |
806 | ||
807 | /* | |
808 | * handle ACK timer expiry | |
809 | */ | |
810 | static void rxrpc_ack_time_expired(unsigned long _call) | |
811 | { | |
812 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
813 | ||
814 | _enter("{%d}", call->debug_id); | |
815 | ||
816 | if (call->state >= RXRPC_CALL_COMPLETE) | |
817 | return; | |
818 | ||
819 | read_lock_bh(&call->state_lock); | |
820 | if (call->state < RXRPC_CALL_COMPLETE && | |
821 | !test_and_set_bit(RXRPC_CALL_ACK, &call->events)) | |
651350d1 | 822 | rxrpc_queue_call(call); |
17926a79 DH |
823 | read_unlock_bh(&call->state_lock); |
824 | } |