Commit | Line | Data |
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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 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
5a0e3ad6 | 14 | #include <linux/slab.h> |
17926a79 DH |
15 | #include <linux/module.h> |
16 | #include <linux/circ_buf.h> | |
7727640c TS |
17 | #include <linux/hashtable.h> |
18 | #include <linux/spinlock_types.h> | |
17926a79 DH |
19 | #include <net/sock.h> |
20 | #include <net/af_rxrpc.h> | |
21 | #include "ar-internal.h" | |
22 | ||
5873c083 DH |
23 | /* |
24 | * Maximum lifetime of a call (in jiffies). | |
25 | */ | |
dad8aff7 | 26 | unsigned int rxrpc_max_call_lifetime = 60 * HZ; |
5873c083 DH |
27 | |
28 | /* | |
29 | * Time till dead call expires after last use (in jiffies). | |
30 | */ | |
dad8aff7 | 31 | unsigned int rxrpc_dead_call_expiry = 2 * HZ; |
5873c083 | 32 | |
5b8848d1 | 33 | const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { |
1f8481d1 DH |
34 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
35 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", | |
36 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", | |
37 | [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK", | |
38 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", | |
39 | [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", | |
40 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", | |
41 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", | |
42 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", | |
43 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", | |
44 | [RXRPC_CALL_COMPLETE] = "Complete", | |
45 | [RXRPC_CALL_SERVER_BUSY] = "SvBusy ", | |
46 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", | |
47 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
48 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", | |
49 | [RXRPC_CALL_DEAD] = "Dead ", | |
50 | }; | |
51 | ||
17926a79 DH |
52 | struct kmem_cache *rxrpc_call_jar; |
53 | LIST_HEAD(rxrpc_calls); | |
54 | DEFINE_RWLOCK(rxrpc_call_lock); | |
17926a79 DH |
55 | |
56 | static void rxrpc_destroy_call(struct work_struct *work); | |
57 | static void rxrpc_call_life_expired(unsigned long _call); | |
58 | static void rxrpc_dead_call_expired(unsigned long _call); | |
59 | static void rxrpc_ack_time_expired(unsigned long _call); | |
60 | static void rxrpc_resend_time_expired(unsigned long _call); | |
61 | ||
7727640c TS |
62 | static DEFINE_SPINLOCK(rxrpc_call_hash_lock); |
63 | static DEFINE_HASHTABLE(rxrpc_call_hash, 10); | |
64 | ||
65 | /* | |
66 | * Hash function for rxrpc_call_hash | |
67 | */ | |
68 | static unsigned long rxrpc_call_hashfunc( | |
0d12f8a4 DH |
69 | u8 in_clientflag, |
70 | u32 cid, | |
71 | u32 call_id, | |
72 | u32 epoch, | |
73 | u16 service_id, | |
7727640c TS |
74 | sa_family_t proto, |
75 | void *localptr, | |
76 | unsigned int addr_size, | |
77 | const u8 *peer_addr) | |
78 | { | |
79 | const u16 *p; | |
80 | unsigned int i; | |
81 | unsigned long key; | |
7727640c TS |
82 | |
83 | _enter(""); | |
84 | ||
85 | key = (unsigned long)localptr; | |
86 | /* We just want to add up the __be32 values, so forcing the | |
87 | * cast should be okay. | |
88 | */ | |
0d12f8a4 DH |
89 | key += epoch; |
90 | key += service_id; | |
91 | key += call_id; | |
92 | key += (cid & RXRPC_CIDMASK) >> RXRPC_CIDSHIFT; | |
93 | key += cid & RXRPC_CHANNELMASK; | |
94 | key += in_clientflag; | |
7727640c TS |
95 | key += proto; |
96 | /* Step through the peer address in 16-bit portions for speed */ | |
97 | for (i = 0, p = (const u16 *)peer_addr; i < addr_size >> 1; i++, p++) | |
98 | key += *p; | |
99 | _leave(" key = 0x%lx", key); | |
100 | return key; | |
101 | } | |
102 | ||
103 | /* | |
104 | * Add a call to the hashtable | |
105 | */ | |
106 | static void rxrpc_call_hash_add(struct rxrpc_call *call) | |
107 | { | |
108 | unsigned long key; | |
109 | unsigned int addr_size = 0; | |
110 | ||
111 | _enter(""); | |
112 | switch (call->proto) { | |
113 | case AF_INET: | |
114 | addr_size = sizeof(call->peer_ip.ipv4_addr); | |
115 | break; | |
116 | case AF_INET6: | |
117 | addr_size = sizeof(call->peer_ip.ipv6_addr); | |
118 | break; | |
119 | default: | |
120 | break; | |
121 | } | |
122 | key = rxrpc_call_hashfunc(call->in_clientflag, call->cid, | |
123 | call->call_id, call->epoch, | |
124 | call->service_id, call->proto, | |
125 | call->conn->trans->local, addr_size, | |
126 | call->peer_ip.ipv6_addr); | |
127 | /* Store the full key in the call */ | |
128 | call->hash_key = key; | |
129 | spin_lock(&rxrpc_call_hash_lock); | |
130 | hash_add_rcu(rxrpc_call_hash, &call->hash_node, key); | |
131 | spin_unlock(&rxrpc_call_hash_lock); | |
132 | _leave(""); | |
133 | } | |
134 | ||
135 | /* | |
136 | * Remove a call from the hashtable | |
137 | */ | |
138 | static void rxrpc_call_hash_del(struct rxrpc_call *call) | |
139 | { | |
140 | _enter(""); | |
141 | spin_lock(&rxrpc_call_hash_lock); | |
142 | hash_del_rcu(&call->hash_node); | |
143 | spin_unlock(&rxrpc_call_hash_lock); | |
144 | _leave(""); | |
145 | } | |
146 | ||
147 | /* | |
148 | * Find a call in the hashtable and return it, or NULL if it | |
149 | * isn't there. | |
150 | */ | |
151 | struct rxrpc_call *rxrpc_find_call_hash( | |
0d12f8a4 | 152 | struct rxrpc_host_header *hdr, |
7727640c TS |
153 | void *localptr, |
154 | sa_family_t proto, | |
0d12f8a4 | 155 | const void *peer_addr) |
7727640c TS |
156 | { |
157 | unsigned long key; | |
158 | unsigned int addr_size = 0; | |
159 | struct rxrpc_call *call = NULL; | |
160 | struct rxrpc_call *ret = NULL; | |
0d12f8a4 | 161 | u8 in_clientflag = hdr->flags & RXRPC_CLIENT_INITIATED; |
7727640c TS |
162 | |
163 | _enter(""); | |
164 | switch (proto) { | |
165 | case AF_INET: | |
166 | addr_size = sizeof(call->peer_ip.ipv4_addr); | |
167 | break; | |
168 | case AF_INET6: | |
169 | addr_size = sizeof(call->peer_ip.ipv6_addr); | |
170 | break; | |
171 | default: | |
172 | break; | |
173 | } | |
174 | ||
0d12f8a4 DH |
175 | key = rxrpc_call_hashfunc(in_clientflag, hdr->cid, hdr->callNumber, |
176 | hdr->epoch, hdr->serviceId, | |
177 | proto, localptr, addr_size, | |
7727640c TS |
178 | peer_addr); |
179 | hash_for_each_possible_rcu(rxrpc_call_hash, call, hash_node, key) { | |
180 | if (call->hash_key == key && | |
0d12f8a4 DH |
181 | call->call_id == hdr->callNumber && |
182 | call->cid == hdr->cid && | |
183 | call->in_clientflag == in_clientflag && | |
184 | call->service_id == hdr->serviceId && | |
7727640c TS |
185 | call->proto == proto && |
186 | call->local == localptr && | |
187 | memcmp(call->peer_ip.ipv6_addr, peer_addr, | |
0d12f8a4 DH |
188 | addr_size) == 0 && |
189 | call->epoch == hdr->epoch) { | |
7727640c TS |
190 | ret = call; |
191 | break; | |
192 | } | |
193 | } | |
194 | _leave(" = %p", ret); | |
195 | return ret; | |
196 | } | |
197 | ||
2341e077 DH |
198 | /* |
199 | * find an extant server call | |
200 | * - called in process context with IRQs enabled | |
201 | */ | |
202 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, | |
203 | unsigned long user_call_ID) | |
204 | { | |
205 | struct rxrpc_call *call; | |
206 | struct rb_node *p; | |
207 | ||
208 | _enter("%p,%lx", rx, user_call_ID); | |
209 | ||
210 | read_lock(&rx->call_lock); | |
211 | ||
212 | p = rx->calls.rb_node; | |
213 | while (p) { | |
214 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
215 | ||
216 | if (user_call_ID < call->user_call_ID) | |
217 | p = p->rb_left; | |
218 | else if (user_call_ID > call->user_call_ID) | |
219 | p = p->rb_right; | |
220 | else | |
221 | goto found_extant_call; | |
222 | } | |
223 | ||
224 | read_unlock(&rx->call_lock); | |
225 | _leave(" = NULL"); | |
226 | return NULL; | |
227 | ||
228 | found_extant_call: | |
229 | rxrpc_get_call(call); | |
230 | read_unlock(&rx->call_lock); | |
231 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); | |
232 | return call; | |
233 | } | |
234 | ||
17926a79 DH |
235 | /* |
236 | * allocate a new call | |
237 | */ | |
238 | static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) | |
239 | { | |
240 | struct rxrpc_call *call; | |
241 | ||
242 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
243 | if (!call) | |
244 | return NULL; | |
245 | ||
246 | call->acks_winsz = 16; | |
247 | call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long), | |
248 | gfp); | |
249 | if (!call->acks_window) { | |
250 | kmem_cache_free(rxrpc_call_jar, call); | |
251 | return NULL; | |
252 | } | |
253 | ||
254 | setup_timer(&call->lifetimer, &rxrpc_call_life_expired, | |
255 | (unsigned long) call); | |
256 | setup_timer(&call->deadspan, &rxrpc_dead_call_expired, | |
257 | (unsigned long) call); | |
258 | setup_timer(&call->ack_timer, &rxrpc_ack_time_expired, | |
259 | (unsigned long) call); | |
260 | setup_timer(&call->resend_timer, &rxrpc_resend_time_expired, | |
261 | (unsigned long) call); | |
262 | INIT_WORK(&call->destroyer, &rxrpc_destroy_call); | |
263 | INIT_WORK(&call->processor, &rxrpc_process_call); | |
264 | INIT_LIST_HEAD(&call->accept_link); | |
265 | skb_queue_head_init(&call->rx_queue); | |
266 | skb_queue_head_init(&call->rx_oos_queue); | |
267 | init_waitqueue_head(&call->tx_waitq); | |
268 | spin_lock_init(&call->lock); | |
269 | rwlock_init(&call->state_lock); | |
270 | atomic_set(&call->usage, 1); | |
271 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); | |
272 | call->state = RXRPC_CALL_CLIENT_SEND_REQUEST; | |
273 | ||
274 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
275 | ||
276 | call->rx_data_expect = 1; | |
277 | call->rx_data_eaten = 0; | |
278 | call->rx_first_oos = 0; | |
817913d8 | 279 | call->ackr_win_top = call->rx_data_eaten + 1 + rxrpc_rx_window_size; |
17926a79 DH |
280 | call->creation_jif = jiffies; |
281 | return call; | |
282 | } | |
283 | ||
284 | /* | |
fd589a8f | 285 | * allocate a new client call and attempt to get a connection slot for it |
17926a79 DH |
286 | */ |
287 | static struct rxrpc_call *rxrpc_alloc_client_call( | |
288 | struct rxrpc_sock *rx, | |
289 | struct rxrpc_transport *trans, | |
290 | struct rxrpc_conn_bundle *bundle, | |
291 | gfp_t gfp) | |
292 | { | |
293 | struct rxrpc_call *call; | |
294 | int ret; | |
295 | ||
296 | _enter(""); | |
297 | ||
298 | ASSERT(rx != NULL); | |
299 | ASSERT(trans != NULL); | |
300 | ASSERT(bundle != NULL); | |
301 | ||
302 | call = rxrpc_alloc_call(gfp); | |
303 | if (!call) | |
304 | return ERR_PTR(-ENOMEM); | |
305 | ||
306 | sock_hold(&rx->sk); | |
307 | call->socket = rx; | |
308 | call->rx_data_post = 1; | |
309 | ||
310 | ret = rxrpc_connect_call(rx, trans, bundle, call, gfp); | |
311 | if (ret < 0) { | |
312 | kmem_cache_free(rxrpc_call_jar, call); | |
313 | return ERR_PTR(ret); | |
314 | } | |
315 | ||
7727640c TS |
316 | /* Record copies of information for hashtable lookup */ |
317 | call->proto = rx->proto; | |
318 | call->local = trans->local; | |
319 | switch (call->proto) { | |
320 | case AF_INET: | |
321 | call->peer_ip.ipv4_addr = | |
322 | trans->peer->srx.transport.sin.sin_addr.s_addr; | |
323 | break; | |
324 | case AF_INET6: | |
325 | memcpy(call->peer_ip.ipv6_addr, | |
326 | trans->peer->srx.transport.sin6.sin6_addr.in6_u.u6_addr8, | |
327 | sizeof(call->peer_ip.ipv6_addr)); | |
328 | break; | |
329 | } | |
330 | call->epoch = call->conn->epoch; | |
331 | call->service_id = call->conn->service_id; | |
332 | call->in_clientflag = call->conn->in_clientflag; | |
333 | /* Add the new call to the hashtable */ | |
334 | rxrpc_call_hash_add(call); | |
335 | ||
17926a79 | 336 | spin_lock(&call->conn->trans->peer->lock); |
f66d7490 | 337 | hlist_add_head(&call->error_link, &call->conn->trans->peer->error_targets); |
17926a79 DH |
338 | spin_unlock(&call->conn->trans->peer->lock); |
339 | ||
5873c083 | 340 | call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime; |
17926a79 DH |
341 | add_timer(&call->lifetimer); |
342 | ||
343 | _leave(" = %p", call); | |
344 | return call; | |
345 | } | |
346 | ||
347 | /* | |
348 | * set up a call for the given data | |
349 | * - called in process context with IRQs enabled | |
350 | */ | |
2341e077 | 351 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
17926a79 DH |
352 | struct rxrpc_transport *trans, |
353 | struct rxrpc_conn_bundle *bundle, | |
354 | unsigned long user_call_ID, | |
17926a79 DH |
355 | gfp_t gfp) |
356 | { | |
2341e077 DH |
357 | struct rxrpc_call *call, *xcall; |
358 | struct rb_node *parent, **pp; | |
17926a79 | 359 | |
2341e077 DH |
360 | _enter("%p,%d,%d,%lx", |
361 | rx, trans->debug_id, bundle ? bundle->debug_id : -1, | |
362 | user_call_ID); | |
17926a79 | 363 | |
2341e077 DH |
364 | call = rxrpc_alloc_client_call(rx, trans, bundle, gfp); |
365 | if (IS_ERR(call)) { | |
366 | _leave(" = %ld", PTR_ERR(call)); | |
367 | return call; | |
17926a79 DH |
368 | } |
369 | ||
2341e077 DH |
370 | call->user_call_ID = user_call_ID; |
371 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); | |
17926a79 DH |
372 | |
373 | write_lock(&rx->call_lock); | |
374 | ||
375 | pp = &rx->calls.rb_node; | |
376 | parent = NULL; | |
377 | while (*pp) { | |
378 | parent = *pp; | |
2341e077 | 379 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 380 | |
2341e077 | 381 | if (user_call_ID < xcall->user_call_ID) |
17926a79 | 382 | pp = &(*pp)->rb_left; |
2341e077 | 383 | else if (user_call_ID > xcall->user_call_ID) |
17926a79 DH |
384 | pp = &(*pp)->rb_right; |
385 | else | |
2341e077 | 386 | goto found_user_ID_now_present; |
17926a79 DH |
387 | } |
388 | ||
17926a79 DH |
389 | rxrpc_get_call(call); |
390 | ||
391 | rb_link_node(&call->sock_node, parent, pp); | |
392 | rb_insert_color(&call->sock_node, &rx->calls); | |
393 | write_unlock(&rx->call_lock); | |
394 | ||
395 | write_lock_bh(&rxrpc_call_lock); | |
396 | list_add_tail(&call->link, &rxrpc_calls); | |
397 | write_unlock_bh(&rxrpc_call_lock); | |
398 | ||
399 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); | |
400 | ||
401 | _leave(" = %p [new]", call); | |
402 | return call; | |
403 | ||
2341e077 DH |
404 | /* We unexpectedly found the user ID in the list after taking |
405 | * the call_lock. This shouldn't happen unless the user races | |
406 | * with itself and tries to add the same user ID twice at the | |
407 | * same time in different threads. | |
408 | */ | |
409 | found_user_ID_now_present: | |
17926a79 | 410 | write_unlock(&rx->call_lock); |
2341e077 DH |
411 | rxrpc_put_call(call); |
412 | _leave(" = -EEXIST [%p]", call); | |
413 | return ERR_PTR(-EEXIST); | |
17926a79 DH |
414 | } |
415 | ||
416 | /* | |
417 | * set up an incoming call | |
418 | * - called in process context with IRQs enabled | |
419 | */ | |
420 | struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, | |
421 | struct rxrpc_connection *conn, | |
843099ca | 422 | struct rxrpc_host_header *hdr) |
17926a79 DH |
423 | { |
424 | struct rxrpc_call *call, *candidate; | |
425 | struct rb_node **p, *parent; | |
0d12f8a4 | 426 | u32 call_id; |
17926a79 | 427 | |
843099ca | 428 | _enter(",%d", conn->debug_id); |
17926a79 DH |
429 | |
430 | ASSERT(rx != NULL); | |
431 | ||
843099ca | 432 | candidate = rxrpc_alloc_call(GFP_NOIO); |
17926a79 DH |
433 | if (!candidate) |
434 | return ERR_PTR(-EBUSY); | |
435 | ||
436 | candidate->socket = rx; | |
437 | candidate->conn = conn; | |
438 | candidate->cid = hdr->cid; | |
439 | candidate->call_id = hdr->callNumber; | |
0d12f8a4 | 440 | candidate->channel = hdr->cid & RXRPC_CHANNELMASK; |
17926a79 DH |
441 | candidate->rx_data_post = 0; |
442 | candidate->state = RXRPC_CALL_SERVER_ACCEPTING; | |
443 | if (conn->security_ix > 0) | |
444 | candidate->state = RXRPC_CALL_SERVER_SECURING; | |
445 | ||
446 | write_lock_bh(&conn->lock); | |
447 | ||
448 | /* set the channel for this call */ | |
449 | call = conn->channels[candidate->channel]; | |
450 | _debug("channel[%u] is %p", candidate->channel, call); | |
451 | if (call && call->call_id == hdr->callNumber) { | |
452 | /* already set; must've been a duplicate packet */ | |
453 | _debug("extant call [%d]", call->state); | |
454 | ASSERTCMP(call->conn, ==, conn); | |
455 | ||
456 | read_lock(&call->state_lock); | |
457 | switch (call->state) { | |
458 | case RXRPC_CALL_LOCALLY_ABORTED: | |
4c198ad1 | 459 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) |
651350d1 | 460 | rxrpc_queue_call(call); |
17926a79 DH |
461 | case RXRPC_CALL_REMOTELY_ABORTED: |
462 | read_unlock(&call->state_lock); | |
463 | goto aborted_call; | |
464 | default: | |
465 | rxrpc_get_call(call); | |
466 | read_unlock(&call->state_lock); | |
467 | goto extant_call; | |
468 | } | |
469 | } | |
470 | ||
471 | if (call) { | |
472 | /* it seems the channel is still in use from the previous call | |
473 | * - ditch the old binding if its call is now complete */ | |
474 | _debug("CALL: %u { %s }", | |
475 | call->debug_id, rxrpc_call_states[call->state]); | |
476 | ||
477 | if (call->state >= RXRPC_CALL_COMPLETE) { | |
478 | conn->channels[call->channel] = NULL; | |
479 | } else { | |
480 | write_unlock_bh(&conn->lock); | |
481 | kmem_cache_free(rxrpc_call_jar, candidate); | |
482 | _leave(" = -EBUSY"); | |
483 | return ERR_PTR(-EBUSY); | |
484 | } | |
485 | } | |
486 | ||
487 | /* check the call number isn't duplicate */ | |
488 | _debug("check dup"); | |
489 | call_id = hdr->callNumber; | |
490 | p = &conn->calls.rb_node; | |
491 | parent = NULL; | |
492 | while (*p) { | |
493 | parent = *p; | |
494 | call = rb_entry(parent, struct rxrpc_call, conn_node); | |
495 | ||
7727640c TS |
496 | /* The tree is sorted in order of the __be32 value without |
497 | * turning it into host order. | |
498 | */ | |
0d12f8a4 | 499 | if (call_id < call->call_id) |
17926a79 | 500 | p = &(*p)->rb_left; |
0d12f8a4 | 501 | else if (call_id > call->call_id) |
17926a79 DH |
502 | p = &(*p)->rb_right; |
503 | else | |
504 | goto old_call; | |
505 | } | |
506 | ||
507 | /* make the call available */ | |
508 | _debug("new call"); | |
509 | call = candidate; | |
510 | candidate = NULL; | |
511 | rb_link_node(&call->conn_node, parent, p); | |
512 | rb_insert_color(&call->conn_node, &conn->calls); | |
513 | conn->channels[call->channel] = call; | |
514 | sock_hold(&rx->sk); | |
515 | atomic_inc(&conn->usage); | |
516 | write_unlock_bh(&conn->lock); | |
517 | ||
518 | spin_lock(&conn->trans->peer->lock); | |
f66d7490 | 519 | hlist_add_head(&call->error_link, &conn->trans->peer->error_targets); |
17926a79 DH |
520 | spin_unlock(&conn->trans->peer->lock); |
521 | ||
522 | write_lock_bh(&rxrpc_call_lock); | |
523 | list_add_tail(&call->link, &rxrpc_calls); | |
524 | write_unlock_bh(&rxrpc_call_lock); | |
525 | ||
7727640c TS |
526 | /* Record copies of information for hashtable lookup */ |
527 | call->proto = rx->proto; | |
528 | call->local = conn->trans->local; | |
529 | switch (call->proto) { | |
530 | case AF_INET: | |
531 | call->peer_ip.ipv4_addr = | |
532 | conn->trans->peer->srx.transport.sin.sin_addr.s_addr; | |
533 | break; | |
534 | case AF_INET6: | |
535 | memcpy(call->peer_ip.ipv6_addr, | |
536 | conn->trans->peer->srx.transport.sin6.sin6_addr.in6_u.u6_addr8, | |
537 | sizeof(call->peer_ip.ipv6_addr)); | |
538 | break; | |
539 | default: | |
540 | break; | |
541 | } | |
542 | call->epoch = conn->epoch; | |
543 | call->service_id = conn->service_id; | |
544 | call->in_clientflag = conn->in_clientflag; | |
545 | /* Add the new call to the hashtable */ | |
546 | rxrpc_call_hash_add(call); | |
547 | ||
17926a79 DH |
548 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
549 | ||
5873c083 | 550 | call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime; |
17926a79 DH |
551 | add_timer(&call->lifetimer); |
552 | _leave(" = %p {%d} [new]", call, call->debug_id); | |
553 | return call; | |
554 | ||
555 | extant_call: | |
556 | write_unlock_bh(&conn->lock); | |
557 | kmem_cache_free(rxrpc_call_jar, candidate); | |
558 | _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1); | |
559 | return call; | |
560 | ||
561 | aborted_call: | |
562 | write_unlock_bh(&conn->lock); | |
563 | kmem_cache_free(rxrpc_call_jar, candidate); | |
564 | _leave(" = -ECONNABORTED"); | |
565 | return ERR_PTR(-ECONNABORTED); | |
566 | ||
567 | old_call: | |
568 | write_unlock_bh(&conn->lock); | |
569 | kmem_cache_free(rxrpc_call_jar, candidate); | |
570 | _leave(" = -ECONNRESET [old]"); | |
571 | return ERR_PTR(-ECONNRESET); | |
572 | } | |
573 | ||
17926a79 DH |
574 | /* |
575 | * detach a call from a socket and set up for release | |
576 | */ | |
577 | void rxrpc_release_call(struct rxrpc_call *call) | |
578 | { | |
651350d1 | 579 | struct rxrpc_connection *conn = call->conn; |
17926a79 DH |
580 | struct rxrpc_sock *rx = call->socket; |
581 | ||
582 | _enter("{%d,%d,%d,%d}", | |
583 | call->debug_id, atomic_read(&call->usage), | |
584 | atomic_read(&call->ackr_not_idle), | |
585 | call->rx_first_oos); | |
586 | ||
587 | spin_lock_bh(&call->lock); | |
588 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
589 | BUG(); | |
590 | spin_unlock_bh(&call->lock); | |
591 | ||
592 | /* dissociate from the socket | |
593 | * - the socket's ref on the call is passed to the death timer | |
594 | */ | |
651350d1 | 595 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); |
17926a79 DH |
596 | |
597 | write_lock_bh(&rx->call_lock); | |
598 | if (!list_empty(&call->accept_link)) { | |
599 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", | |
600 | call, call->events, call->flags); | |
601 | ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags)); | |
602 | list_del_init(&call->accept_link); | |
603 | sk_acceptq_removed(&rx->sk); | |
604 | } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
605 | rb_erase(&call->sock_node, &rx->calls); | |
606 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
607 | clear_bit(RXRPC_CALL_HAS_USERID, &call->flags); | |
608 | } | |
609 | write_unlock_bh(&rx->call_lock); | |
610 | ||
17926a79 | 611 | /* free up the channel for reuse */ |
651350d1 DH |
612 | spin_lock(&conn->trans->client_lock); |
613 | write_lock_bh(&conn->lock); | |
614 | write_lock(&call->state_lock); | |
615 | ||
616 | if (conn->channels[call->channel] == call) | |
617 | conn->channels[call->channel] = NULL; | |
618 | ||
619 | if (conn->out_clientflag && conn->bundle) { | |
620 | conn->avail_calls++; | |
621 | switch (conn->avail_calls) { | |
622 | case 1: | |
623 | list_move_tail(&conn->bundle_link, | |
624 | &conn->bundle->avail_conns); | |
625 | case 2 ... RXRPC_MAXCALLS - 1: | |
626 | ASSERT(conn->channels[0] == NULL || | |
627 | conn->channels[1] == NULL || | |
628 | conn->channels[2] == NULL || | |
629 | conn->channels[3] == NULL); | |
630 | break; | |
631 | case RXRPC_MAXCALLS: | |
632 | list_move_tail(&conn->bundle_link, | |
633 | &conn->bundle->unused_conns); | |
634 | ASSERT(conn->channels[0] == NULL && | |
635 | conn->channels[1] == NULL && | |
636 | conn->channels[2] == NULL && | |
637 | conn->channels[3] == NULL); | |
638 | break; | |
639 | default: | |
9b6d5398 | 640 | pr_err("conn->avail_calls=%d\n", conn->avail_calls); |
651350d1 DH |
641 | BUG(); |
642 | } | |
17926a79 DH |
643 | } |
644 | ||
651350d1 | 645 | spin_unlock(&conn->trans->client_lock); |
17926a79 DH |
646 | |
647 | if (call->state < RXRPC_CALL_COMPLETE && | |
648 | call->state != RXRPC_CALL_CLIENT_FINAL_ACK) { | |
649 | _debug("+++ ABORTING STATE %d +++\n", call->state); | |
650 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 651 | call->local_abort = RX_CALL_DEAD; |
4c198ad1 | 652 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
651350d1 | 653 | rxrpc_queue_call(call); |
17926a79 DH |
654 | } |
655 | write_unlock(&call->state_lock); | |
651350d1 | 656 | write_unlock_bh(&conn->lock); |
17926a79 | 657 | |
651350d1 | 658 | /* clean up the Rx queue */ |
17926a79 DH |
659 | if (!skb_queue_empty(&call->rx_queue) || |
660 | !skb_queue_empty(&call->rx_oos_queue)) { | |
661 | struct rxrpc_skb_priv *sp; | |
662 | struct sk_buff *skb; | |
663 | ||
664 | _debug("purge Rx queues"); | |
665 | ||
666 | spin_lock_bh(&call->lock); | |
667 | while ((skb = skb_dequeue(&call->rx_queue)) || | |
668 | (skb = skb_dequeue(&call->rx_oos_queue))) { | |
669 | sp = rxrpc_skb(skb); | |
670 | if (sp->call) { | |
671 | ASSERTCMP(sp->call, ==, call); | |
672 | rxrpc_put_call(call); | |
673 | sp->call = NULL; | |
674 | } | |
675 | skb->destructor = NULL; | |
676 | spin_unlock_bh(&call->lock); | |
677 | ||
678 | _debug("- zap %s %%%u #%u", | |
679 | rxrpc_pkts[sp->hdr.type], | |
0d12f8a4 | 680 | sp->hdr.serial, sp->hdr.seq); |
17926a79 DH |
681 | rxrpc_free_skb(skb); |
682 | spin_lock_bh(&call->lock); | |
683 | } | |
684 | spin_unlock_bh(&call->lock); | |
685 | ||
686 | ASSERTCMP(call->state, !=, RXRPC_CALL_COMPLETE); | |
687 | } | |
688 | ||
689 | del_timer_sync(&call->resend_timer); | |
690 | del_timer_sync(&call->ack_timer); | |
691 | del_timer_sync(&call->lifetimer); | |
5873c083 | 692 | call->deadspan.expires = jiffies + rxrpc_dead_call_expiry; |
17926a79 DH |
693 | add_timer(&call->deadspan); |
694 | ||
695 | _leave(""); | |
696 | } | |
697 | ||
698 | /* | |
699 | * handle a dead call being ready for reaping | |
700 | */ | |
701 | static void rxrpc_dead_call_expired(unsigned long _call) | |
702 | { | |
703 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
704 | ||
705 | _enter("{%d}", call->debug_id); | |
706 | ||
707 | write_lock_bh(&call->state_lock); | |
708 | call->state = RXRPC_CALL_DEAD; | |
709 | write_unlock_bh(&call->state_lock); | |
710 | rxrpc_put_call(call); | |
711 | } | |
712 | ||
713 | /* | |
714 | * mark a call as to be released, aborting it if it's still in progress | |
715 | * - called with softirqs disabled | |
716 | */ | |
717 | static void rxrpc_mark_call_released(struct rxrpc_call *call) | |
718 | { | |
719 | bool sched; | |
720 | ||
721 | write_lock(&call->state_lock); | |
722 | if (call->state < RXRPC_CALL_DEAD) { | |
723 | sched = false; | |
724 | if (call->state < RXRPC_CALL_COMPLETE) { | |
725 | _debug("abort call %p", call); | |
726 | call->state = RXRPC_CALL_LOCALLY_ABORTED; | |
dc44b3a0 | 727 | call->local_abort = RX_CALL_DEAD; |
4c198ad1 | 728 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) |
17926a79 DH |
729 | sched = true; |
730 | } | |
4c198ad1 | 731 | if (!test_and_set_bit(RXRPC_CALL_EV_RELEASE, &call->events)) |
17926a79 DH |
732 | sched = true; |
733 | if (sched) | |
651350d1 | 734 | rxrpc_queue_call(call); |
17926a79 DH |
735 | } |
736 | write_unlock(&call->state_lock); | |
737 | } | |
738 | ||
739 | /* | |
740 | * release all the calls associated with a socket | |
741 | */ | |
742 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
743 | { | |
744 | struct rxrpc_call *call; | |
745 | struct rb_node *p; | |
746 | ||
747 | _enter("%p", rx); | |
748 | ||
749 | read_lock_bh(&rx->call_lock); | |
750 | ||
751 | /* mark all the calls as no longer wanting incoming packets */ | |
752 | for (p = rb_first(&rx->calls); p; p = rb_next(p)) { | |
753 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
754 | rxrpc_mark_call_released(call); | |
755 | } | |
756 | ||
757 | /* kill the not-yet-accepted incoming calls */ | |
758 | list_for_each_entry(call, &rx->secureq, accept_link) { | |
759 | rxrpc_mark_call_released(call); | |
760 | } | |
761 | ||
762 | list_for_each_entry(call, &rx->acceptq, accept_link) { | |
763 | rxrpc_mark_call_released(call); | |
764 | } | |
765 | ||
766 | read_unlock_bh(&rx->call_lock); | |
767 | _leave(""); | |
768 | } | |
769 | ||
770 | /* | |
771 | * release a call | |
772 | */ | |
773 | void __rxrpc_put_call(struct rxrpc_call *call) | |
774 | { | |
775 | ASSERT(call != NULL); | |
776 | ||
777 | _enter("%p{u=%d}", call, atomic_read(&call->usage)); | |
778 | ||
779 | ASSERTCMP(atomic_read(&call->usage), >, 0); | |
780 | ||
781 | if (atomic_dec_and_test(&call->usage)) { | |
782 | _debug("call %d dead", call->debug_id); | |
783 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
651350d1 | 784 | rxrpc_queue_work(&call->destroyer); |
17926a79 DH |
785 | } |
786 | _leave(""); | |
787 | } | |
788 | ||
789 | /* | |
790 | * clean up a call | |
791 | */ | |
792 | static void rxrpc_cleanup_call(struct rxrpc_call *call) | |
793 | { | |
794 | _net("DESTROY CALL %d", call->debug_id); | |
795 | ||
796 | ASSERT(call->socket); | |
797 | ||
798 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); | |
799 | ||
800 | del_timer_sync(&call->lifetimer); | |
801 | del_timer_sync(&call->deadspan); | |
802 | del_timer_sync(&call->ack_timer); | |
803 | del_timer_sync(&call->resend_timer); | |
804 | ||
805 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); | |
806 | ASSERTCMP(call->events, ==, 0); | |
807 | if (work_pending(&call->processor)) { | |
808 | _debug("defer destroy"); | |
651350d1 | 809 | rxrpc_queue_work(&call->destroyer); |
17926a79 DH |
810 | return; |
811 | } | |
812 | ||
813 | if (call->conn) { | |
814 | spin_lock(&call->conn->trans->peer->lock); | |
f66d7490 | 815 | hlist_del_init(&call->error_link); |
17926a79 DH |
816 | spin_unlock(&call->conn->trans->peer->lock); |
817 | ||
818 | write_lock_bh(&call->conn->lock); | |
819 | rb_erase(&call->conn_node, &call->conn->calls); | |
820 | write_unlock_bh(&call->conn->lock); | |
821 | rxrpc_put_connection(call->conn); | |
822 | } | |
823 | ||
7727640c TS |
824 | /* Remove the call from the hash */ |
825 | rxrpc_call_hash_del(call); | |
826 | ||
17926a79 DH |
827 | if (call->acks_window) { |
828 | _debug("kill Tx window %d", | |
829 | CIRC_CNT(call->acks_head, call->acks_tail, | |
830 | call->acks_winsz)); | |
831 | smp_mb(); | |
832 | while (CIRC_CNT(call->acks_head, call->acks_tail, | |
833 | call->acks_winsz) > 0) { | |
834 | struct rxrpc_skb_priv *sp; | |
835 | unsigned long _skb; | |
836 | ||
837 | _skb = call->acks_window[call->acks_tail] & ~1; | |
0d12f8a4 DH |
838 | sp = rxrpc_skb((struct sk_buff *)_skb); |
839 | _debug("+++ clear Tx %u", sp->hdr.seq); | |
840 | rxrpc_free_skb((struct sk_buff *)_skb); | |
17926a79 DH |
841 | call->acks_tail = |
842 | (call->acks_tail + 1) & (call->acks_winsz - 1); | |
843 | } | |
844 | ||
845 | kfree(call->acks_window); | |
846 | } | |
847 | ||
848 | rxrpc_free_skb(call->tx_pending); | |
849 | ||
850 | rxrpc_purge_queue(&call->rx_queue); | |
851 | ASSERT(skb_queue_empty(&call->rx_oos_queue)); | |
852 | sock_put(&call->socket->sk); | |
853 | kmem_cache_free(rxrpc_call_jar, call); | |
854 | } | |
855 | ||
856 | /* | |
857 | * destroy a call | |
858 | */ | |
859 | static void rxrpc_destroy_call(struct work_struct *work) | |
860 | { | |
861 | struct rxrpc_call *call = | |
862 | container_of(work, struct rxrpc_call, destroyer); | |
863 | ||
864 | _enter("%p{%d,%d,%p}", | |
865 | call, atomic_read(&call->usage), call->channel, call->conn); | |
866 | ||
867 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
868 | ||
869 | write_lock_bh(&rxrpc_call_lock); | |
870 | list_del_init(&call->link); | |
871 | write_unlock_bh(&rxrpc_call_lock); | |
872 | ||
873 | rxrpc_cleanup_call(call); | |
874 | _leave(""); | |
875 | } | |
876 | ||
877 | /* | |
878 | * preemptively destroy all the call records from a transport endpoint rather | |
879 | * than waiting for them to time out | |
880 | */ | |
881 | void __exit rxrpc_destroy_all_calls(void) | |
882 | { | |
883 | struct rxrpc_call *call; | |
884 | ||
885 | _enter(""); | |
886 | write_lock_bh(&rxrpc_call_lock); | |
887 | ||
888 | while (!list_empty(&rxrpc_calls)) { | |
889 | call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); | |
890 | _debug("Zapping call %p", call); | |
891 | ||
892 | list_del_init(&call->link); | |
893 | ||
894 | switch (atomic_read(&call->usage)) { | |
895 | case 0: | |
896 | ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD); | |
897 | break; | |
898 | case 1: | |
899 | if (del_timer_sync(&call->deadspan) != 0 && | |
900 | call->state != RXRPC_CALL_DEAD) | |
901 | rxrpc_dead_call_expired((unsigned long) call); | |
902 | if (call->state != RXRPC_CALL_DEAD) | |
903 | break; | |
904 | default: | |
9b6d5398 | 905 | pr_err("Call %p still in use (%d,%d,%s,%lx,%lx)!\n", |
17926a79 DH |
906 | call, atomic_read(&call->usage), |
907 | atomic_read(&call->ackr_not_idle), | |
908 | rxrpc_call_states[call->state], | |
909 | call->flags, call->events); | |
910 | if (!skb_queue_empty(&call->rx_queue)) | |
9b6d5398 | 911 | pr_err("Rx queue occupied\n"); |
17926a79 | 912 | if (!skb_queue_empty(&call->rx_oos_queue)) |
9b6d5398 | 913 | pr_err("OOS queue occupied\n"); |
17926a79 DH |
914 | break; |
915 | } | |
916 | ||
917 | write_unlock_bh(&rxrpc_call_lock); | |
918 | cond_resched(); | |
919 | write_lock_bh(&rxrpc_call_lock); | |
920 | } | |
921 | ||
922 | write_unlock_bh(&rxrpc_call_lock); | |
923 | _leave(""); | |
924 | } | |
925 | ||
926 | /* | |
927 | * handle call lifetime being exceeded | |
928 | */ | |
929 | static void rxrpc_call_life_expired(unsigned long _call) | |
930 | { | |
931 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
932 | ||
933 | if (call->state >= RXRPC_CALL_COMPLETE) | |
934 | return; | |
935 | ||
936 | _enter("{%d}", call->debug_id); | |
937 | read_lock_bh(&call->state_lock); | |
938 | if (call->state < RXRPC_CALL_COMPLETE) { | |
4c198ad1 | 939 | set_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events); |
651350d1 | 940 | rxrpc_queue_call(call); |
17926a79 DH |
941 | } |
942 | read_unlock_bh(&call->state_lock); | |
943 | } | |
944 | ||
945 | /* | |
946 | * handle resend timer expiry | |
3b5bac2b | 947 | * - may not take call->state_lock as this can deadlock against del_timer_sync() |
17926a79 DH |
948 | */ |
949 | static void rxrpc_resend_time_expired(unsigned long _call) | |
950 | { | |
951 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
952 | ||
953 | _enter("{%d}", call->debug_id); | |
954 | ||
955 | if (call->state >= RXRPC_CALL_COMPLETE) | |
956 | return; | |
957 | ||
17926a79 | 958 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
4c198ad1 | 959 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events)) |
651350d1 | 960 | rxrpc_queue_call(call); |
17926a79 DH |
961 | } |
962 | ||
963 | /* | |
964 | * handle ACK timer expiry | |
965 | */ | |
966 | static void rxrpc_ack_time_expired(unsigned long _call) | |
967 | { | |
968 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
969 | ||
970 | _enter("{%d}", call->debug_id); | |
971 | ||
972 | if (call->state >= RXRPC_CALL_COMPLETE) | |
973 | return; | |
974 | ||
975 | read_lock_bh(&call->state_lock); | |
976 | if (call->state < RXRPC_CALL_COMPLETE && | |
4c198ad1 | 977 | !test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events)) |
651350d1 | 978 | rxrpc_queue_call(call); |
17926a79 DH |
979 | read_unlock_bh(&call->state_lock); |
980 | } |