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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> | |
7727640c TS |
15 | #include <linux/hashtable.h> |
16 | #include <linux/spinlock_types.h> | |
17926a79 DH |
17 | #include <net/sock.h> |
18 | #include <net/af_rxrpc.h> | |
19 | #include "ar-internal.h" | |
20 | ||
5873c083 DH |
21 | /* |
22 | * Maximum lifetime of a call (in jiffies). | |
23 | */ | |
24 | unsigned rxrpc_max_call_lifetime = 60 * HZ; | |
25 | ||
26 | /* | |
27 | * Time till dead call expires after last use (in jiffies). | |
28 | */ | |
29 | unsigned rxrpc_dead_call_expiry = 2 * HZ; | |
30 | ||
5b8848d1 | 31 | const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { |
1f8481d1 DH |
32 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
33 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", | |
34 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", | |
35 | [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK", | |
36 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", | |
37 | [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", | |
38 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", | |
39 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", | |
40 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", | |
41 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", | |
42 | [RXRPC_CALL_COMPLETE] = "Complete", | |
43 | [RXRPC_CALL_SERVER_BUSY] = "SvBusy ", | |
44 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", | |
45 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
46 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", | |
47 | [RXRPC_CALL_DEAD] = "Dead ", | |
48 | }; | |
49 | ||
17926a79 DH |
50 | struct kmem_cache *rxrpc_call_jar; |
51 | LIST_HEAD(rxrpc_calls); | |
52 | DEFINE_RWLOCK(rxrpc_call_lock); | |
17926a79 DH |
53 | |
54 | static void rxrpc_destroy_call(struct work_struct *work); | |
55 | static void rxrpc_call_life_expired(unsigned long _call); | |
56 | static void rxrpc_dead_call_expired(unsigned long _call); | |
57 | static void rxrpc_ack_time_expired(unsigned long _call); | |
58 | static void rxrpc_resend_time_expired(unsigned long _call); | |
59 | ||
7727640c TS |
60 | static DEFINE_SPINLOCK(rxrpc_call_hash_lock); |
61 | static DEFINE_HASHTABLE(rxrpc_call_hash, 10); | |
62 | ||
63 | /* | |
64 | * Hash function for rxrpc_call_hash | |
65 | */ | |
66 | static unsigned long rxrpc_call_hashfunc( | |
0d12f8a4 DH |
67 | u8 in_clientflag, |
68 | u32 cid, | |
69 | u32 call_id, | |
70 | u32 epoch, | |
71 | u16 service_id, | |
7727640c TS |
72 | sa_family_t proto, |
73 | void *localptr, | |
74 | unsigned int addr_size, | |
75 | const u8 *peer_addr) | |
76 | { | |
77 | const u16 *p; | |
78 | unsigned int i; | |
79 | unsigned long key; | |
7727640c TS |
80 | |
81 | _enter(""); | |
82 | ||
83 | key = (unsigned long)localptr; | |
84 | /* We just want to add up the __be32 values, so forcing the | |
85 | * cast should be okay. | |
86 | */ | |
0d12f8a4 DH |
87 | key += epoch; |
88 | key += service_id; | |
89 | key += call_id; | |
90 | key += (cid & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT; | |
91 | key += cid & RXRPC_CHANNELMASK; | |
92 | key += in_clientflag; | |
7727640c TS |
93 | key += proto; |
94 | /* Step through the peer address in 16-bit portions for speed */ | |
95 | for (i = 0, p = (const u16 *)peer_addr; i < addr_size >> 1; i++, p++) | |
96 | key += *p; | |
97 | _leave(" key = 0x%lx", key); | |
98 | return key; | |
99 | } | |
100 | ||
101 | /* | |
102 | * Add a call to the hashtable | |
103 | */ | |
104 | static void rxrpc_call_hash_add(struct rxrpc_call *call) | |
105 | { | |
106 | unsigned long key; | |
107 | unsigned int addr_size = 0; | |
108 | ||
109 | _enter(""); | |
110 | switch (call->proto) { | |
111 | case AF_INET: | |
112 | addr_size = sizeof(call->peer_ip.ipv4_addr); | |
113 | break; | |
114 | case AF_INET6: | |
115 | addr_size = sizeof(call->peer_ip.ipv6_addr); | |
116 | break; | |
117 | default: | |
118 | break; | |
119 | } | |
120 | key = rxrpc_call_hashfunc(call->in_clientflag, call->cid, | |
121 | call->call_id, call->epoch, | |
122 | call->service_id, call->proto, | |
123 | call->conn->trans->local, addr_size, | |
124 | call->peer_ip.ipv6_addr); | |
125 | /* Store the full key in the call */ | |
126 | call->hash_key = key; | |
127 | spin_lock(&rxrpc_call_hash_lock); | |
128 | hash_add_rcu(rxrpc_call_hash, &call->hash_node, key); | |
129 | spin_unlock(&rxrpc_call_hash_lock); | |
130 | _leave(""); | |
131 | } | |
132 | ||
133 | /* | |
134 | * Remove a call from the hashtable | |
135 | */ | |
136 | static void rxrpc_call_hash_del(struct rxrpc_call *call) | |
137 | { | |
138 | _enter(""); | |
139 | spin_lock(&rxrpc_call_hash_lock); | |
140 | hash_del_rcu(&call->hash_node); | |
141 | spin_unlock(&rxrpc_call_hash_lock); | |
142 | _leave(""); | |
143 | } | |
144 | ||
145 | /* | |
146 | * Find a call in the hashtable and return it, or NULL if it | |
147 | * isn't there. | |
148 | */ | |
149 | struct rxrpc_call *rxrpc_find_call_hash( | |
0d12f8a4 | 150 | struct rxrpc_host_header *hdr, |
7727640c TS |
151 | void *localptr, |
152 | sa_family_t proto, | |
0d12f8a4 | 153 | const void *peer_addr) |
7727640c TS |
154 | { |
155 | unsigned long key; | |
156 | unsigned int addr_size = 0; | |
157 | struct rxrpc_call *call = NULL; | |
158 | struct rxrpc_call *ret = NULL; | |
0d12f8a4 | 159 | u8 in_clientflag = hdr->flags & RXRPC_CLIENT_INITIATED; |
7727640c TS |
160 | |
161 | _enter(""); | |
162 | switch (proto) { | |
163 | case AF_INET: | |
164 | addr_size = sizeof(call->peer_ip.ipv4_addr); | |
165 | break; | |
166 | case AF_INET6: | |
167 | addr_size = sizeof(call->peer_ip.ipv6_addr); | |
168 | break; | |
169 | default: | |
170 | break; | |
171 | } | |
172 | ||
0d12f8a4 DH |
173 | key = rxrpc_call_hashfunc(in_clientflag, hdr->cid, hdr->callNumber, |
174 | hdr->epoch, hdr->serviceId, | |
175 | proto, localptr, addr_size, | |
7727640c TS |
176 | peer_addr); |
177 | hash_for_each_possible_rcu(rxrpc_call_hash, call, hash_node, key) { | |
178 | if (call->hash_key == key && | |
0d12f8a4 DH |
179 | call->call_id == hdr->callNumber && |
180 | call->cid == hdr->cid && | |
181 | call->in_clientflag == in_clientflag && | |
182 | call->service_id == hdr->serviceId && | |
7727640c TS |
183 | call->proto == proto && |
184 | call->local == localptr && | |
185 | memcmp(call->peer_ip.ipv6_addr, peer_addr, | |
0d12f8a4 DH |
186 | addr_size) == 0 && |
187 | call->epoch == hdr->epoch) { | |
7727640c TS |
188 | ret = call; |
189 | break; | |
190 | } | |
191 | } | |
192 | _leave(" = %p", ret); | |
193 | return ret; | |
194 | } | |
195 | ||
17926a79 DH |
196 | /* |
197 | * allocate a new call | |
198 | */ | |
199 | static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) | |
200 | { | |
201 | struct rxrpc_call *call; | |
202 | ||
203 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
204 | if (!call) | |
205 | return NULL; | |
206 | ||
207 | call->acks_winsz = 16; | |
208 | call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long), | |
209 | gfp); | |
210 | if (!call->acks_window) { | |
211 | kmem_cache_free(rxrpc_call_jar, call); | |
212 | return NULL; | |
213 | } | |
214 | ||
215 | setup_timer(&call->lifetimer, &rxrpc_call_life_expired, | |
216 | (unsigned long) call); | |
217 | setup_timer(&call->deadspan, &rxrpc_dead_call_expired, | |
218 | (unsigned long) call); | |
219 | setup_timer(&call->ack_timer, &rxrpc_ack_time_expired, | |
220 | (unsigned long) call); | |
221 | setup_timer(&call->resend_timer, &rxrpc_resend_time_expired, | |
222 | (unsigned long) call); | |
223 | INIT_WORK(&call->destroyer, &rxrpc_destroy_call); | |
224 | INIT_WORK(&call->processor, &rxrpc_process_call); | |
225 | INIT_LIST_HEAD(&call->accept_link); | |
226 | skb_queue_head_init(&call->rx_queue); | |
227 | skb_queue_head_init(&call->rx_oos_queue); | |
228 | init_waitqueue_head(&call->tx_waitq); | |
229 | spin_lock_init(&call->lock); | |
230 | rwlock_init(&call->state_lock); | |
231 | atomic_set(&call->usage, 1); | |
232 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); | |
233 | call->state = RXRPC_CALL_CLIENT_SEND_REQUEST; | |
234 | ||
235 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
236 | ||
237 | call->rx_data_expect = 1; | |
238 | call->rx_data_eaten = 0; | |
239 | call->rx_first_oos = 0; | |
817913d8 | 240 | call->ackr_win_top = call->rx_data_eaten + 1 + rxrpc_rx_window_size; |
17926a79 DH |
241 | call->creation_jif = jiffies; |
242 | return call; | |
243 | } | |
244 | ||
245 | /* | |
fd589a8f | 246 | * allocate a new client call and attempt to get a connection slot for it |
17926a79 DH |
247 | */ |
248 | static struct rxrpc_call *rxrpc_alloc_client_call( | |
249 | struct rxrpc_sock *rx, | |
250 | struct rxrpc_transport *trans, | |
251 | struct rxrpc_conn_bundle *bundle, | |
252 | gfp_t gfp) | |
253 | { | |
254 | struct rxrpc_call *call; | |
255 | int ret; | |
256 | ||
257 | _enter(""); | |
258 | ||
259 | ASSERT(rx != NULL); | |
260 | ASSERT(trans != NULL); | |
261 | ASSERT(bundle != NULL); | |
262 | ||
263 | call = rxrpc_alloc_call(gfp); | |
264 | if (!call) | |
265 | return ERR_PTR(-ENOMEM); | |
266 | ||
267 | sock_hold(&rx->sk); | |
268 | call->socket = rx; | |
269 | call->rx_data_post = 1; | |
270 | ||
271 | ret = rxrpc_connect_call(rx, trans, bundle, call, gfp); | |
272 | if (ret < 0) { | |
273 | kmem_cache_free(rxrpc_call_jar, call); | |
274 | return ERR_PTR(ret); | |
275 | } | |
276 | ||
7727640c TS |
277 | /* Record copies of information for hashtable lookup */ |
278 | call->proto = rx->proto; | |
279 | call->local = trans->local; | |
280 | switch (call->proto) { | |
281 | case AF_INET: | |
282 | call->peer_ip.ipv4_addr = | |
283 | trans->peer->srx.transport.sin.sin_addr.s_addr; | |
284 | break; | |
285 | case AF_INET6: | |
286 | memcpy(call->peer_ip.ipv6_addr, | |
287 | trans->peer->srx.transport.sin6.sin6_addr.in6_u.u6_addr8, | |
288 | sizeof(call->peer_ip.ipv6_addr)); | |
289 | break; | |
290 | } | |
291 | call->epoch = call->conn->epoch; | |
292 | call->service_id = call->conn->service_id; | |
293 | call->in_clientflag = call->conn->in_clientflag; | |
294 | /* Add the new call to the hashtable */ | |
295 | rxrpc_call_hash_add(call); | |
296 | ||
17926a79 DH |
297 | spin_lock(&call->conn->trans->peer->lock); |
298 | list_add(&call->error_link, &call->conn->trans->peer->error_targets); | |
299 | spin_unlock(&call->conn->trans->peer->lock); | |
300 | ||
5873c083 | 301 | call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime; |
17926a79 DH |
302 | add_timer(&call->lifetimer); |
303 | ||
304 | _leave(" = %p", call); | |
305 | return call; | |
306 | } | |
307 | ||
308 | /* | |
309 | * set up a call for the given data | |
310 | * - called in process context with IRQs enabled | |
311 | */ | |
312 | struct rxrpc_call *rxrpc_get_client_call(struct rxrpc_sock *rx, | |
313 | struct rxrpc_transport *trans, | |
314 | struct rxrpc_conn_bundle *bundle, | |
315 | unsigned long user_call_ID, | |
316 | int create, | |
317 | gfp_t gfp) | |
318 | { | |
319 | struct rxrpc_call *call, *candidate; | |
320 | struct rb_node *p, *parent, **pp; | |
321 | ||
322 | _enter("%p,%d,%d,%lx,%d", | |
323 | rx, trans ? trans->debug_id : -1, bundle ? bundle->debug_id : -1, | |
324 | user_call_ID, create); | |
325 | ||
326 | /* search the extant calls first for one that matches the specified | |
327 | * user ID */ | |
328 | read_lock(&rx->call_lock); | |
329 | ||
330 | p = rx->calls.rb_node; | |
331 | while (p) { | |
332 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
333 | ||
334 | if (user_call_ID < call->user_call_ID) | |
335 | p = p->rb_left; | |
336 | else if (user_call_ID > call->user_call_ID) | |
337 | p = p->rb_right; | |
338 | else | |
339 | goto found_extant_call; | |
340 | } | |
341 | ||
342 | read_unlock(&rx->call_lock); | |
343 | ||
344 | if (!create || !trans) | |
345 | return ERR_PTR(-EBADSLT); | |
346 | ||
347 | /* not yet present - create a candidate for a new record and then | |
348 | * redo the search */ | |
349 | candidate = rxrpc_alloc_client_call(rx, trans, bundle, gfp); | |
350 | if (IS_ERR(candidate)) { | |
351 | _leave(" = %ld", PTR_ERR(candidate)); | |
352 | return candidate; | |
353 | } | |
354 | ||
355 | candidate->user_call_ID = user_call_ID; | |
356 | __set_bit(RXRPC_CALL_HAS_USERID, &candidate->flags); | |
357 | ||
358 | write_lock(&rx->call_lock); | |
359 | ||
360 | pp = &rx->calls.rb_node; | |
361 | parent = NULL; | |
362 | while (*pp) { | |
363 | parent = *pp; | |
364 | call = rb_entry(parent, struct rxrpc_call, sock_node); | |
365 | ||
366 | if (user_call_ID < call->user_call_ID) | |
367 | pp = &(*pp)->rb_left; | |
368 | else if (user_call_ID > call->user_call_ID) | |
369 | pp = &(*pp)->rb_right; | |
370 | else | |
371 | goto found_extant_second; | |
372 | } | |
373 | ||
374 | /* second search also failed; add the new call */ | |
375 | call = candidate; | |
376 | candidate = NULL; | |
377 | rxrpc_get_call(call); | |
378 | ||
379 | rb_link_node(&call->sock_node, parent, pp); | |
380 | rb_insert_color(&call->sock_node, &rx->calls); | |
381 | write_unlock(&rx->call_lock); | |
382 | ||
383 | write_lock_bh(&rxrpc_call_lock); | |
384 | list_add_tail(&call->link, &rxrpc_calls); | |
385 | write_unlock_bh(&rxrpc_call_lock); | |
386 | ||
387 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); | |
388 | ||
389 | _leave(" = %p [new]", call); | |
390 | return call; | |
391 | ||
392 | /* we found the call in the list immediately */ | |
393 | found_extant_call: | |
394 | rxrpc_get_call(call); | |
395 | read_unlock(&rx->call_lock); | |
396 | _leave(" = %p [extant %d]", call, atomic_read(&call->usage)); | |
397 | return call; | |
398 | ||
399 | /* we found the call on the second time through the list */ | |
400 | found_extant_second: | |
401 | rxrpc_get_call(call); | |
402 | write_unlock(&rx->call_lock); | |
403 | rxrpc_put_call(candidate); | |
404 | _leave(" = %p [second %d]", call, atomic_read(&call->usage)); | |
405 | return call; | |
406 | } | |
407 | ||
408 | /* | |
409 | * set up an incoming call | |
410 | * - called in process context with IRQs enabled | |
411 | */ | |
412 | struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, | |
413 | struct rxrpc_connection *conn, | |
0d12f8a4 | 414 | struct rxrpc_host_header *hdr, |
17926a79 DH |
415 | gfp_t gfp) |
416 | { | |
417 | struct rxrpc_call *call, *candidate; | |
418 | struct rb_node **p, *parent; | |
0d12f8a4 | 419 | u32 call_id; |
17926a79 DH |
420 | |
421 | _enter(",%d,,%x", conn->debug_id, gfp); | |
422 | ||
423 | ASSERT(rx != NULL); | |
424 | ||
425 | candidate = rxrpc_alloc_call(gfp); | |
426 | if (!candidate) | |
427 | return ERR_PTR(-EBUSY); | |
428 | ||
429 | candidate->socket = rx; | |
430 | candidate->conn = conn; | |
431 | candidate->cid = hdr->cid; | |
432 | candidate->call_id = hdr->callNumber; | |
0d12f8a4 | 433 | candidate->channel = hdr->cid & RXRPC_CHANNELMASK; |
17926a79 DH |
434 | candidate->rx_data_post = 0; |
435 | candidate->state = RXRPC_CALL_SERVER_ACCEPTING; | |
436 | if (conn->security_ix > 0) | |
437 | candidate->state = RXRPC_CALL_SERVER_SECURING; | |
438 | ||
439 | write_lock_bh(&conn->lock); | |
440 | ||
441 | /* set the channel for this call */ | |
442 | call = conn->channels[candidate->channel]; | |
443 | _debug("channel[%u] is %p", candidate->channel, call); | |
444 | if (call && call->call_id == hdr->callNumber) { | |
445 | /* already set; must've been a duplicate packet */ | |
446 | _debug("extant call [%d]", call->state); | |
447 | ASSERTCMP(call->conn, ==, conn); | |
448 | ||
449 | read_lock(&call->state_lock); | |
450 | switch (call->state) { | |
451 | case RXRPC_CALL_LOCALLY_ABORTED: | |
4c198ad1 | 452 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) |
651350d1 | 453 | rxrpc_queue_call(call); |
17926a79 DH |
454 | case RXRPC_CALL_REMOTELY_ABORTED: |
455 | read_unlock(&call->state_lock); | |
456 | goto aborted_call; | |
457 | default: | |
458 | rxrpc_get_call(call); | |
459 | read_unlock(&call->state_lock); | |
460 | goto extant_call; | |
461 | } | |
462 | } | |
463 | ||
464 | if (call) { | |
465 | /* it seems the channel is still in use from the previous call | |
466 | * - ditch the old binding if its call is now complete */ | |
467 | _debug("CALL: %u { %s }", | |
468 | call->debug_id, rxrpc_call_states[call->state]); | |
469 | ||
470 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
471 | conn->channels[call->channel] = NULL; | |
472 | } else { | |
473 | write_unlock_bh(&conn->lock); | |
474 | kmem_cache_free(rxrpc_call_jar, candidate); | |
475 | _leave(" = -EBUSY"); | |
476 | return ERR_PTR(-EBUSY); | |
477 | } | |
478 | } | |
479 | ||
480 | /* check the call number isn't duplicate */ | |
481 | _debug("check dup"); | |
482 | call_id = hdr->callNumber; | |
483 | p = &conn->calls.rb_node; | |
484 | parent = NULL; | |
485 | while (*p) { | |
486 | parent = *p; | |
487 | call = rb_entry(parent, struct rxrpc_call, conn_node); | |
488 | ||
7727640c TS |
489 | /* The tree is sorted in order of the __be32 value without |
490 | * turning it into host order. | |
491 | */ | |
0d12f8a4 | 492 | if (call_id < call->call_id) |
17926a79 | 493 | p = &(*p)->rb_left; |
0d12f8a4 | 494 | else if (call_id > call->call_id) |
17926a79 DH |
495 | p = &(*p)->rb_right; |
496 | else | |
497 | goto old_call; | |
498 | } | |
499 | ||
500 | /* make the call available */ | |
501 | _debug("new call"); | |
502 | call = candidate; | |
503 | candidate = NULL; | |
504 | rb_link_node(&call->conn_node, parent, p); | |
505 | rb_insert_color(&call->conn_node, &conn->calls); | |
506 | conn->channels[call->channel] = call; | |
507 | sock_hold(&rx->sk); | |
508 | atomic_inc(&conn->usage); | |
509 | write_unlock_bh(&conn->lock); | |
510 | ||
511 | spin_lock(&conn->trans->peer->lock); | |
512 | list_add(&call->error_link, &conn->trans->peer->error_targets); | |
513 | spin_unlock(&conn->trans->peer->lock); | |
514 | ||
515 | write_lock_bh(&rxrpc_call_lock); | |
516 | list_add_tail(&call->link, &rxrpc_calls); | |
517 | write_unlock_bh(&rxrpc_call_lock); | |
518 | ||
7727640c TS |
519 | /* Record copies of information for hashtable lookup */ |
520 | call->proto = rx->proto; | |
521 | call->local = conn->trans->local; | |
522 | switch (call->proto) { | |
523 | case AF_INET: | |
524 | call->peer_ip.ipv4_addr = | |
525 | conn->trans->peer->srx.transport.sin.sin_addr.s_addr; | |
526 | break; | |
527 | case AF_INET6: | |
528 | memcpy(call->peer_ip.ipv6_addr, | |
529 | conn->trans->peer->srx.transport.sin6.sin6_addr.in6_u.u6_addr8, | |
530 | sizeof(call->peer_ip.ipv6_addr)); | |
531 | break; | |
532 | default: | |
533 | break; | |
534 | } | |
535 | call->epoch = conn->epoch; | |
536 | call->service_id = conn->service_id; | |
537 | call->in_clientflag = conn->in_clientflag; | |
538 | /* Add the new call to the hashtable */ | |
539 | rxrpc_call_hash_add(call); | |
540 | ||
17926a79 DH |
541 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
542 | ||
5873c083 | 543 | call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime; |
17926a79 DH |
544 | add_timer(&call->lifetimer); |
545 | _leave(" = %p {%d} [new]", call, call->debug_id); | |
546 | return call; | |
547 | ||
548 | extant_call: | |
549 | write_unlock_bh(&conn->lock); | |
550 | kmem_cache_free(rxrpc_call_jar, candidate); | |
551 | _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1); | |
552 | return call; | |
553 | ||
554 | aborted_call: | |
555 | write_unlock_bh(&conn->lock); | |
556 | kmem_cache_free(rxrpc_call_jar, candidate); | |
557 | _leave(" = -ECONNABORTED"); | |
558 | return ERR_PTR(-ECONNABORTED); | |
559 | ||
560 | old_call: | |
561 | write_unlock_bh(&conn->lock); | |
562 | kmem_cache_free(rxrpc_call_jar, candidate); | |
563 | _leave(" = -ECONNRESET [old]"); | |
564 | return ERR_PTR(-ECONNRESET); | |
565 | } | |
566 | ||
567 | /* | |
568 | * find an extant server call | |
569 | * - called in process context with IRQs enabled | |
570 | */ | |
571 | struct rxrpc_call *rxrpc_find_server_call(struct rxrpc_sock *rx, | |
572 | unsigned long user_call_ID) | |
573 | { | |
574 | struct rxrpc_call *call; | |
575 | struct rb_node *p; | |
576 | ||
577 | _enter("%p,%lx", rx, user_call_ID); | |
578 | ||
579 | /* search the extant calls for one that matches the specified user | |
580 | * ID */ | |
581 | read_lock(&rx->call_lock); | |
582 | ||
583 | p = rx->calls.rb_node; | |
584 | while (p) { | |
585 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
586 | ||
587 | if (user_call_ID < call->user_call_ID) | |
588 | p = p->rb_left; | |
589 | else if (user_call_ID > call->user_call_ID) | |
590 | p = p->rb_right; | |
591 | else | |
592 | goto found_extant_call; | |
593 | } | |
594 | ||
595 | read_unlock(&rx->call_lock); | |
596 | _leave(" = NULL"); | |
597 | return NULL; | |
598 | ||
599 | /* we found the call in the list immediately */ | |
600 | found_extant_call: | |
601 | rxrpc_get_call(call); | |
602 | read_unlock(&rx->call_lock); | |
603 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); | |
604 | return call; | |
605 | } | |
606 | ||
607 | /* | |
608 | * detach a call from a socket and set up for release | |
609 | */ | |
610 | void rxrpc_release_call(struct rxrpc_call *call) | |
611 | { | |
651350d1 | 612 | struct rxrpc_connection *conn = call->conn; |
17926a79 DH |
613 | struct rxrpc_sock *rx = call->socket; |
614 | ||
615 | _enter("{%d,%d,%d,%d}", | |
616 | call->debug_id, atomic_read(&call->usage), | |
617 | atomic_read(&call->ackr_not_idle), | |
618 | call->rx_first_oos); | |
619 | ||
620 | spin_lock_bh(&call->lock); | |
621 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
622 | BUG(); | |
623 | spin_unlock_bh(&call->lock); | |
624 | ||
625 | /* dissociate from the socket | |
626 | * - the socket's ref on the call is passed to the death timer | |
627 | */ | |
651350d1 | 628 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); |
17926a79 DH |
629 | |
630 | write_lock_bh(&rx->call_lock); | |
631 | if (!list_empty(&call->accept_link)) { | |
632 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", | |
633 | call, call->events, call->flags); | |
634 | ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags)); | |
635 | list_del_init(&call->accept_link); | |
636 | sk_acceptq_removed(&rx->sk); | |
637 | } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
638 | rb_erase(&call->sock_node, &rx->calls); | |
639 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
640 | clear_bit(RXRPC_CALL_HAS_USERID, &call->flags); | |
641 | } | |
642 | write_unlock_bh(&rx->call_lock); | |
643 | ||
17926a79 | 644 | /* free up the channel for reuse */ |
651350d1 DH |
645 | spin_lock(&conn->trans->client_lock); |
646 | write_lock_bh(&conn->lock); | |
647 | write_lock(&call->state_lock); | |
648 | ||
649 | if (conn->channels[call->channel] == call) | |
650 | conn->channels[call->channel] = NULL; | |
651 | ||
652 | if (conn->out_clientflag && conn->bundle) { | |
653 | conn->avail_calls++; | |
654 | switch (conn->avail_calls) { | |
655 | case 1: | |
656 | list_move_tail(&conn->bundle_link, | |
657 | &conn->bundle->avail_conns); | |
658 | case 2 ... RXRPC_MAXCALLS - 1: | |
659 | ASSERT(conn->channels[0] == NULL || | |
660 | conn->channels[1] == NULL || | |
661 | conn->channels[2] == NULL || | |
662 | conn->channels[3] == NULL); | |
663 | break; | |
664 | case RXRPC_MAXCALLS: | |
665 | list_move_tail(&conn->bundle_link, | |
666 | &conn->bundle->unused_conns); | |
667 | ASSERT(conn->channels[0] == NULL && | |
668 | conn->channels[1] == NULL && | |
669 | conn->channels[2] == NULL && | |
670 | conn->channels[3] == NULL); | |
671 | break; | |
672 | default: | |
673 | printk(KERN_ERR "RxRPC: conn->avail_calls=%d\n", | |
674 | conn->avail_calls); | |
675 | BUG(); | |
676 | } | |
17926a79 DH |
677 | } |
678 | ||
651350d1 | 679 | spin_unlock(&conn->trans->client_lock); |
17926a79 DH |
680 | |
681 | if (call->state < RXRPC_CALL_COMPLETE && | |
682 | call->state != RXRPC_CALL_CLIENT_FINAL_ACK) { | |
683 | _debug("+++ ABORTING STATE %d +++\n", call->state); | |
684 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
685 | call->abort_code = RX_CALL_DEAD; | |
4c198ad1 | 686 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 687 | rxrpc_queue_call(call); |
17926a79 DH |
688 | } |
689 | write_unlock(&call->state_lock); | |
651350d1 | 690 | write_unlock_bh(&conn->lock); |
17926a79 | 691 | |
651350d1 | 692 | /* clean up the Rx queue */ |
17926a79 DH |
693 | if (!skb_queue_empty(&call->rx_queue) || |
694 | !skb_queue_empty(&call->rx_oos_queue)) { | |
695 | struct rxrpc_skb_priv *sp; | |
696 | struct sk_buff *skb; | |
697 | ||
698 | _debug("purge Rx queues"); | |
699 | ||
700 | spin_lock_bh(&call->lock); | |
701 | while ((skb = skb_dequeue(&call->rx_queue)) || | |
702 | (skb = skb_dequeue(&call->rx_oos_queue))) { | |
703 | sp = rxrpc_skb(skb); | |
704 | if (sp->call) { | |
705 | ASSERTCMP(sp->call, ==, call); | |
706 | rxrpc_put_call(call); | |
707 | sp->call = NULL; | |
708 | } | |
709 | skb->destructor = NULL; | |
710 | spin_unlock_bh(&call->lock); | |
711 | ||
712 | _debug("- zap %s %%%u #%u", | |
713 | rxrpc_pkts[sp->hdr.type], | |
0d12f8a4 | 714 | sp->hdr.serial, sp->hdr.seq); |
17926a79 DH |
715 | rxrpc_free_skb(skb); |
716 | spin_lock_bh(&call->lock); | |
717 | } | |
718 | spin_unlock_bh(&call->lock); | |
719 | ||
720 | ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE); | |
721 | } | |
722 | ||
723 | del_timer_sync(&call->resend_timer); | |
724 | del_timer_sync(&call->ack_timer); | |
725 | del_timer_sync(&call->lifetimer); | |
5873c083 | 726 | call->deadspan.expires = jiffies + rxrpc_dead_call_expiry; |
17926a79 DH |
727 | add_timer(&call->deadspan); |
728 | ||
729 | _leave(""); | |
730 | } | |
731 | ||
732 | /* | |
733 | * handle a dead call being ready for reaping | |
734 | */ | |
735 | static void rxrpc_dead_call_expired(unsigned long _call) | |
736 | { | |
737 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
738 | ||
739 | _enter("{%d}", call->debug_id); | |
740 | ||
741 | write_lock_bh(&call->state_lock); | |
742 | call->state = RXRPC_CALL_DEAD; | |
743 | write_unlock_bh(&call->state_lock); | |
744 | rxrpc_put_call(call); | |
745 | } | |
746 | ||
747 | /* | |
748 | * mark a call as to be released, aborting it if it's still in progress | |
749 | * - called with softirqs disabled | |
750 | */ | |
751 | static void rxrpc_mark_call_released(struct rxrpc_call *call) | |
752 | { | |
753 | bool sched; | |
754 | ||
755 | write_lock(&call->state_lock); | |
756 | if (call->state < RXRPC_CALL_DEAD) { | |
757 | sched = false; | |
758 | if (call->state < RXRPC_CALL_COMPLETE) { | |
759 | _debug("abort call %p", call); | |
760 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
761 | call->abort_code = RX_CALL_DEAD; | |
4c198ad1 | 762 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) |
17926a79 DH |
763 | sched = true; |
764 | } | |
4c198ad1 | 765 | if (!test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
17926a79 DH |
766 | sched = true; |
767 | if (sched) | |
651350d1 | 768 | rxrpc_queue_call(call); |
17926a79 DH |
769 | } |
770 | write_unlock(&call->state_lock); | |
771 | } | |
772 | ||
773 | /* | |
774 | * release all the calls associated with a socket | |
775 | */ | |
776 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
777 | { | |
778 | struct rxrpc_call *call; | |
779 | struct rb_node *p; | |
780 | ||
781 | _enter("%p", rx); | |
782 | ||
783 | read_lock_bh(&rx->call_lock); | |
784 | ||
785 | /* mark all the calls as no longer wanting incoming packets */ | |
786 | for (p = rb_first(&rx->calls); p; p = rb_next(p)) { | |
787 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
788 | rxrpc_mark_call_released(call); | |
789 | } | |
790 | ||
791 | /* kill the not-yet-accepted incoming calls */ | |
792 | list_for_each_entry(call, &rx->secureq, accept_link) { | |
793 | rxrpc_mark_call_released(call); | |
794 | } | |
795 | ||
796 | list_for_each_entry(call, &rx->acceptq, accept_link) { | |
797 | rxrpc_mark_call_released(call); | |
798 | } | |
799 | ||
800 | read_unlock_bh(&rx->call_lock); | |
801 | _leave(""); | |
802 | } | |
803 | ||
804 | /* | |
805 | * release a call | |
806 | */ | |
807 | void __rxrpc_put_call(struct rxrpc_call *call) | |
808 | { | |
809 | ASSERT(call != NULL); | |
810 | ||
811 | _enter("%p{u=%d}", call, atomic_read(&call->usage)); | |
812 | ||
813 | ASSERTCMP(atomic_read(&call->usage), >, 0); | |
814 | ||
815 | if (atomic_dec_and_test(&call->usage)) { | |
816 | _debug("call %d dead", call->debug_id); | |
817 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
651350d1 | 818 | rxrpc_queue_work(&call->destroyer); |
17926a79 DH |
819 | } |
820 | _leave(""); | |
821 | } | |
822 | ||
823 | /* | |
824 | * clean up a call | |
825 | */ | |
826 | static void rxrpc_cleanup_call(struct rxrpc_call *call) | |
827 | { | |
828 | _net("DESTROY CALL %d", call->debug_id); | |
829 | ||
830 | ASSERT(call->socket); | |
831 | ||
832 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); | |
833 | ||
834 | del_timer_sync(&call->lifetimer); | |
835 | del_timer_sync(&call->deadspan); | |
836 | del_timer_sync(&call->ack_timer); | |
837 | del_timer_sync(&call->resend_timer); | |
838 | ||
839 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); | |
840 | ASSERTCMP(call->events, ==, 0); | |
841 | if (work_pending(&call->processor)) { | |
842 | _debug("defer destroy"); | |
651350d1 | 843 | rxrpc_queue_work(&call->destroyer); |
17926a79 DH |
844 | return; |
845 | } | |
846 | ||
847 | if (call->conn) { | |
848 | spin_lock(&call->conn->trans->peer->lock); | |
849 | list_del(&call->error_link); | |
850 | spin_unlock(&call->conn->trans->peer->lock); | |
851 | ||
852 | write_lock_bh(&call->conn->lock); | |
853 | rb_erase(&call->conn_node, &call->conn->calls); | |
854 | write_unlock_bh(&call->conn->lock); | |
855 | rxrpc_put_connection(call->conn); | |
856 | } | |
857 | ||
7727640c TS |
858 | /* Remove the call from the hash */ |
859 | rxrpc_call_hash_del(call); | |
860 | ||
17926a79 DH |
861 | if (call->acks_window) { |
862 | _debug("kill Tx window %d", | |
863 | CIRC_CNT(call->acks_head, call->acks_tail, | |
864 | call->acks_winsz)); | |
865 | smp_mb(); | |
866 | while (CIRC_CNT(call->acks_head, call->acks_tail, | |
867 | call->acks_winsz) > 0) { | |
868 | struct rxrpc_skb_priv *sp; | |
869 | unsigned long _skb; | |
870 | ||
871 | _skb = call->acks_window[call->acks_tail] & ~1; | |
0d12f8a4 DH |
872 | sp = rxrpc_skb((struct sk_buff *)_skb); |
873 | _debug("+++ clear Tx %u", sp->hdr.seq); | |
874 | rxrpc_free_skb((struct sk_buff *)_skb); | |
17926a79 DH |
875 | call->acks_tail = |
876 | (call->acks_tail + 1) & (call->acks_winsz - 1); | |
877 | } | |
878 | ||
879 | kfree(call->acks_window); | |
880 | } | |
881 | ||
882 | rxrpc_free_skb(call->tx_pending); | |
883 | ||
884 | rxrpc_purge_queue(&call->rx_queue); | |
885 | ASSERT(skb_queue_empty(&call->rx_oos_queue)); | |
886 | sock_put(&call->socket->sk); | |
887 | kmem_cache_free(rxrpc_call_jar, call); | |
888 | } | |
889 | ||
890 | /* | |
891 | * destroy a call | |
892 | */ | |
893 | static void rxrpc_destroy_call(struct work_struct *work) | |
894 | { | |
895 | struct rxrpc_call *call = | |
896 | container_of(work, struct rxrpc_call, destroyer); | |
897 | ||
898 | _enter("%p{%d,%d,%p}", | |
899 | call, atomic_read(&call->usage), call->channel, call->conn); | |
900 | ||
901 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
902 | ||
903 | write_lock_bh(&rxrpc_call_lock); | |
904 | list_del_init(&call->link); | |
905 | write_unlock_bh(&rxrpc_call_lock); | |
906 | ||
907 | rxrpc_cleanup_call(call); | |
908 | _leave(""); | |
909 | } | |
910 | ||
911 | /* | |
912 | * preemptively destroy all the call records from a transport endpoint rather | |
913 | * than waiting for them to time out | |
914 | */ | |
915 | void __exit rxrpc_destroy_all_calls(void) | |
916 | { | |
917 | struct rxrpc_call *call; | |
918 | ||
919 | _enter(""); | |
920 | write_lock_bh(&rxrpc_call_lock); | |
921 | ||
922 | while (!list_empty(&rxrpc_calls)) { | |
923 | call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); | |
924 | _debug("Zapping call %p", call); | |
925 | ||
926 | list_del_init(&call->link); | |
927 | ||
928 | switch (atomic_read(&call->usage)) { | |
929 | case 0: | |
930 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
931 | break; | |
932 | case 1: | |
933 | if (del_timer_sync(&call->deadspan) != 0 && | |
934 | call->state != RXRPC_CALL_DEAD) | |
935 | rxrpc_dead_call_expired((unsigned long) call); | |
936 | if (call->state != RXRPC_CALL_DEAD) | |
937 | break; | |
938 | default: | |
939 | printk(KERN_ERR "RXRPC:" | |
940 | " Call %p still in use (%d,%d,%s,%lx,%lx)!\n", | |
941 | call, atomic_read(&call->usage), | |
942 | atomic_read(&call->ackr_not_idle), | |
943 | rxrpc_call_states[call->state], | |
944 | call->flags, call->events); | |
945 | if (!skb_queue_empty(&call->rx_queue)) | |
946 | printk(KERN_ERR"RXRPC: Rx queue occupied\n"); | |
947 | if (!skb_queue_empty(&call->rx_oos_queue)) | |
948 | printk(KERN_ERR"RXRPC: OOS queue occupied\n"); | |
949 | break; | |
950 | } | |
951 | ||
952 | write_unlock_bh(&rxrpc_call_lock); | |
953 | cond_resched(); | |
954 | write_lock_bh(&rxrpc_call_lock); | |
955 | } | |
956 | ||
957 | write_unlock_bh(&rxrpc_call_lock); | |
958 | _leave(""); | |
959 | } | |
960 | ||
961 | /* | |
962 | * handle call lifetime being exceeded | |
963 | */ | |
964 | static void rxrpc_call_life_expired(unsigned long _call) | |
965 | { | |
966 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
967 | ||
968 | if (call->state >= RXRPC_CALL_COMPLETE) | |
969 | return; | |
970 | ||
971 | _enter("{%d}", call->debug_id); | |
972 | read_lock_bh(&call->state_lock); | |
973 | if (call->state < RXRPC_CALL_COMPLETE) { | |
4c198ad1 | 974 | set_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events); |
651350d1 | 975 | rxrpc_queue_call(call); |
17926a79 DH |
976 | } |
977 | read_unlock_bh(&call->state_lock); | |
978 | } | |
979 | ||
980 | /* | |
981 | * handle resend timer expiry | |
3b5bac2b | 982 | * - may not take call->state_lock as this can deadlock against del_timer_sync() |
17926a79 DH |
983 | */ |
984 | static void rxrpc_resend_time_expired(unsigned long _call) | |
985 | { | |
986 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
987 | ||
988 | _enter("{%d}", call->debug_id); | |
989 | ||
990 | if (call->state >= RXRPC_CALL_COMPLETE) | |
991 | return; | |
992 | ||
17926a79 | 993 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
4c198ad1 | 994 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events)) |
651350d1 | 995 | rxrpc_queue_call(call); |
17926a79 DH |
996 | } |
997 | ||
998 | /* | |
999 | * handle ACK timer expiry | |
1000 | */ | |
1001 | static void rxrpc_ack_time_expired(unsigned long _call) | |
1002 | { | |
1003 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
1004 | ||
1005 | _enter("{%d}", call->debug_id); | |
1006 | ||
1007 | if (call->state >= RXRPC_CALL_COMPLETE) | |
1008 | return; | |
1009 | ||
1010 | read_lock_bh(&call->state_lock); | |
1011 | if (call->state < RXRPC_CALL_COMPLETE && | |
4c198ad1 | 1012 | !test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events)) |
651350d1 | 1013 | rxrpc_queue_call(call); |
17926a79 DH |
1014 | read_unlock_bh(&call->state_lock); |
1015 | } |