Commit | Line | Data |
---|---|---|
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 | 17 | #include <linux/spinlock_types.h> |
17926a79 DH |
18 | #include <net/sock.h> |
19 | #include <net/af_rxrpc.h> | |
20 | #include "ar-internal.h" | |
21 | ||
5873c083 DH |
22 | /* |
23 | * Maximum lifetime of a call (in jiffies). | |
24 | */ | |
dad8aff7 | 25 | unsigned int rxrpc_max_call_lifetime = 60 * HZ; |
5873c083 | 26 | |
5b8848d1 | 27 | const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { |
f5c17aae | 28 | [RXRPC_CALL_UNINITIALISED] = "Uninit ", |
999b69f8 | 29 | [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", |
1f8481d1 DH |
30 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
31 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", | |
32 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", | |
33 | [RXRPC_CALL_CLIENT_FINAL_ACK] = "ClFnlACK", | |
34 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", | |
35 | [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", | |
36 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", | |
37 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", | |
38 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", | |
39 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", | |
40 | [RXRPC_CALL_COMPLETE] = "Complete", | |
f5c17aae DH |
41 | }; |
42 | ||
43 | const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { | |
44 | [RXRPC_CALL_SUCCEEDED] = "Complete", | |
1f8481d1 DH |
45 | [RXRPC_CALL_SERVER_BUSY] = "SvBusy ", |
46 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", | |
47 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
f5c17aae | 48 | [RXRPC_CALL_LOCAL_ERROR] = "LocError", |
1f8481d1 | 49 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", |
1f8481d1 DH |
50 | }; |
51 | ||
fff72429 DH |
52 | const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = { |
53 | [rxrpc_call_new_client] = "NWc", | |
54 | [rxrpc_call_new_service] = "NWs", | |
55 | [rxrpc_call_queued] = "QUE", | |
56 | [rxrpc_call_queued_ref] = "QUR", | |
57 | [rxrpc_call_seen] = "SEE", | |
58 | [rxrpc_call_got] = "GOT", | |
59 | [rxrpc_call_got_skb] = "Gsk", | |
60 | [rxrpc_call_got_userid] = "Gus", | |
61 | [rxrpc_call_put] = "PUT", | |
62 | [rxrpc_call_put_skb] = "Psk", | |
63 | [rxrpc_call_put_userid] = "Pus", | |
64 | [rxrpc_call_put_noqueue] = "PNQ", | |
65 | }; | |
66 | ||
17926a79 DH |
67 | struct kmem_cache *rxrpc_call_jar; |
68 | LIST_HEAD(rxrpc_calls); | |
69 | DEFINE_RWLOCK(rxrpc_call_lock); | |
17926a79 | 70 | |
17926a79 | 71 | static void rxrpc_call_life_expired(unsigned long _call); |
17926a79 DH |
72 | static void rxrpc_ack_time_expired(unsigned long _call); |
73 | static void rxrpc_resend_time_expired(unsigned long _call); | |
8d94aa38 | 74 | static void rxrpc_cleanup_call(struct rxrpc_call *call); |
17926a79 | 75 | |
2341e077 DH |
76 | /* |
77 | * find an extant server call | |
78 | * - called in process context with IRQs enabled | |
79 | */ | |
80 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, | |
81 | unsigned long user_call_ID) | |
82 | { | |
83 | struct rxrpc_call *call; | |
84 | struct rb_node *p; | |
85 | ||
86 | _enter("%p,%lx", rx, user_call_ID); | |
87 | ||
88 | read_lock(&rx->call_lock); | |
89 | ||
90 | p = rx->calls.rb_node; | |
91 | while (p) { | |
92 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
93 | ||
94 | if (user_call_ID < call->user_call_ID) | |
95 | p = p->rb_left; | |
96 | else if (user_call_ID > call->user_call_ID) | |
97 | p = p->rb_right; | |
98 | else | |
99 | goto found_extant_call; | |
100 | } | |
101 | ||
102 | read_unlock(&rx->call_lock); | |
103 | _leave(" = NULL"); | |
104 | return NULL; | |
105 | ||
106 | found_extant_call: | |
fff72429 | 107 | rxrpc_get_call(call, rxrpc_call_got); |
2341e077 DH |
108 | read_unlock(&rx->call_lock); |
109 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); | |
110 | return call; | |
111 | } | |
112 | ||
17926a79 DH |
113 | /* |
114 | * allocate a new call | |
115 | */ | |
116 | static struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) | |
117 | { | |
118 | struct rxrpc_call *call; | |
119 | ||
120 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
121 | if (!call) | |
122 | return NULL; | |
123 | ||
124 | call->acks_winsz = 16; | |
125 | call->acks_window = kmalloc(call->acks_winsz * sizeof(unsigned long), | |
126 | gfp); | |
127 | if (!call->acks_window) { | |
128 | kmem_cache_free(rxrpc_call_jar, call); | |
129 | return NULL; | |
130 | } | |
131 | ||
132 | setup_timer(&call->lifetimer, &rxrpc_call_life_expired, | |
133 | (unsigned long) call); | |
17926a79 DH |
134 | setup_timer(&call->ack_timer, &rxrpc_ack_time_expired, |
135 | (unsigned long) call); | |
136 | setup_timer(&call->resend_timer, &rxrpc_resend_time_expired, | |
137 | (unsigned long) call); | |
17926a79 | 138 | INIT_WORK(&call->processor, &rxrpc_process_call); |
999b69f8 | 139 | INIT_LIST_HEAD(&call->link); |
45025bce | 140 | INIT_LIST_HEAD(&call->chan_wait_link); |
17926a79 DH |
141 | INIT_LIST_HEAD(&call->accept_link); |
142 | skb_queue_head_init(&call->rx_queue); | |
143 | skb_queue_head_init(&call->rx_oos_queue); | |
d001648e | 144 | skb_queue_head_init(&call->knlrecv_queue); |
45025bce | 145 | init_waitqueue_head(&call->waitq); |
17926a79 DH |
146 | spin_lock_init(&call->lock); |
147 | rwlock_init(&call->state_lock); | |
148 | atomic_set(&call->usage, 1); | |
149 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); | |
17926a79 DH |
150 | |
151 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
152 | ||
153 | call->rx_data_expect = 1; | |
154 | call->rx_data_eaten = 0; | |
155 | call->rx_first_oos = 0; | |
817913d8 | 156 | call->ackr_win_top = call->rx_data_eaten + 1 + rxrpc_rx_window_size; |
17926a79 DH |
157 | call->creation_jif = jiffies; |
158 | return call; | |
159 | } | |
160 | ||
161 | /* | |
999b69f8 | 162 | * Allocate a new client call. |
17926a79 | 163 | */ |
aa390bbe DH |
164 | static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
165 | struct sockaddr_rxrpc *srx, | |
166 | gfp_t gfp) | |
17926a79 DH |
167 | { |
168 | struct rxrpc_call *call; | |
17926a79 DH |
169 | |
170 | _enter(""); | |
171 | ||
999b69f8 | 172 | ASSERT(rx->local != NULL); |
17926a79 DH |
173 | |
174 | call = rxrpc_alloc_call(gfp); | |
175 | if (!call) | |
176 | return ERR_PTR(-ENOMEM); | |
999b69f8 | 177 | call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; |
17926a79 | 178 | call->rx_data_post = 1; |
999b69f8 | 179 | call->service_id = srx->srx_service; |
8d94aa38 | 180 | rcu_assign_pointer(call->socket, rx); |
999b69f8 DH |
181 | |
182 | _leave(" = %p", call); | |
183 | return call; | |
184 | } | |
185 | ||
186 | /* | |
187 | * Begin client call. | |
188 | */ | |
189 | static int rxrpc_begin_client_call(struct rxrpc_call *call, | |
190 | struct rxrpc_conn_parameters *cp, | |
999b69f8 DH |
191 | struct sockaddr_rxrpc *srx, |
192 | gfp_t gfp) | |
193 | { | |
194 | int ret; | |
195 | ||
196 | /* Set up or get a connection record and set the protocol parameters, | |
197 | * including channel number and call ID. | |
198 | */ | |
aa390bbe | 199 | ret = rxrpc_connect_call(call, cp, srx, gfp); |
999b69f8 DH |
200 | if (ret < 0) |
201 | return ret; | |
202 | ||
85f32278 DH |
203 | spin_lock(&call->conn->params.peer->lock); |
204 | hlist_add_head(&call->error_link, &call->conn->params.peer->error_targets); | |
205 | spin_unlock(&call->conn->params.peer->lock); | |
17926a79 | 206 | |
5873c083 | 207 | call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime; |
17926a79 | 208 | add_timer(&call->lifetimer); |
999b69f8 | 209 | return 0; |
17926a79 DH |
210 | } |
211 | ||
212 | /* | |
213 | * set up a call for the given data | |
214 | * - called in process context with IRQs enabled | |
215 | */ | |
2341e077 | 216 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
19ffa01c | 217 | struct rxrpc_conn_parameters *cp, |
999b69f8 | 218 | struct sockaddr_rxrpc *srx, |
17926a79 | 219 | unsigned long user_call_ID, |
17926a79 DH |
220 | gfp_t gfp) |
221 | { | |
2341e077 DH |
222 | struct rxrpc_call *call, *xcall; |
223 | struct rb_node *parent, **pp; | |
e34d4234 | 224 | const void *here = __builtin_return_address(0); |
999b69f8 | 225 | int ret; |
17926a79 | 226 | |
999b69f8 | 227 | _enter("%p,%lx", rx, user_call_ID); |
17926a79 | 228 | |
aa390bbe | 229 | call = rxrpc_alloc_client_call(rx, srx, gfp); |
2341e077 DH |
230 | if (IS_ERR(call)) { |
231 | _leave(" = %ld", PTR_ERR(call)); | |
232 | return call; | |
17926a79 DH |
233 | } |
234 | ||
8d94aa38 DH |
235 | trace_rxrpc_call(call, rxrpc_call_new_client, |
236 | atomic_read(&call->usage), 0, | |
237 | here, (const void *)user_call_ID); | |
e34d4234 | 238 | |
999b69f8 | 239 | /* Publish the call, even though it is incompletely set up as yet */ |
2341e077 DH |
240 | call->user_call_ID = user_call_ID; |
241 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); | |
17926a79 DH |
242 | |
243 | write_lock(&rx->call_lock); | |
244 | ||
245 | pp = &rx->calls.rb_node; | |
246 | parent = NULL; | |
247 | while (*pp) { | |
248 | parent = *pp; | |
2341e077 | 249 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 250 | |
2341e077 | 251 | if (user_call_ID < xcall->user_call_ID) |
17926a79 | 252 | pp = &(*pp)->rb_left; |
2341e077 | 253 | else if (user_call_ID > xcall->user_call_ID) |
17926a79 DH |
254 | pp = &(*pp)->rb_right; |
255 | else | |
2341e077 | 256 | goto found_user_ID_now_present; |
17926a79 DH |
257 | } |
258 | ||
fff72429 | 259 | rxrpc_get_call(call, rxrpc_call_got_userid); |
17926a79 DH |
260 | rb_link_node(&call->sock_node, parent, pp); |
261 | rb_insert_color(&call->sock_node, &rx->calls); | |
262 | write_unlock(&rx->call_lock); | |
263 | ||
264 | write_lock_bh(&rxrpc_call_lock); | |
265 | list_add_tail(&call->link, &rxrpc_calls); | |
266 | write_unlock_bh(&rxrpc_call_lock); | |
267 | ||
aa390bbe | 268 | ret = rxrpc_begin_client_call(call, cp, srx, gfp); |
999b69f8 DH |
269 | if (ret < 0) |
270 | goto error; | |
271 | ||
17926a79 DH |
272 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); |
273 | ||
274 | _leave(" = %p [new]", call); | |
275 | return call; | |
276 | ||
999b69f8 DH |
277 | error: |
278 | write_lock(&rx->call_lock); | |
279 | rb_erase(&call->sock_node, &rx->calls); | |
280 | write_unlock(&rx->call_lock); | |
fff72429 | 281 | rxrpc_put_call(call, rxrpc_call_put_userid); |
999b69f8 DH |
282 | |
283 | write_lock_bh(&rxrpc_call_lock); | |
d1e858c5 | 284 | list_del_init(&call->link); |
999b69f8 DH |
285 | write_unlock_bh(&rxrpc_call_lock); |
286 | ||
8d94aa38 DH |
287 | error_out: |
288 | __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, | |
289 | RX_CALL_DEAD, ret); | |
17b963e3 | 290 | set_bit(RXRPC_CALL_RELEASED, &call->flags); |
fff72429 | 291 | rxrpc_put_call(call, rxrpc_call_put); |
999b69f8 DH |
292 | _leave(" = %d", ret); |
293 | return ERR_PTR(ret); | |
294 | ||
2341e077 DH |
295 | /* We unexpectedly found the user ID in the list after taking |
296 | * the call_lock. This shouldn't happen unless the user races | |
297 | * with itself and tries to add the same user ID twice at the | |
298 | * same time in different threads. | |
299 | */ | |
300 | found_user_ID_now_present: | |
17926a79 | 301 | write_unlock(&rx->call_lock); |
8d94aa38 DH |
302 | ret = -EEXIST; |
303 | goto error_out; | |
17926a79 DH |
304 | } |
305 | ||
306 | /* | |
307 | * set up an incoming call | |
308 | * - called in process context with IRQs enabled | |
309 | */ | |
310 | struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx, | |
311 | struct rxrpc_connection *conn, | |
42886ffe | 312 | struct sk_buff *skb) |
17926a79 | 313 | { |
42886ffe | 314 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
17926a79 | 315 | struct rxrpc_call *call, *candidate; |
e34d4234 | 316 | const void *here = __builtin_return_address(0); |
a1399f8b | 317 | u32 call_id, chan; |
17926a79 | 318 | |
843099ca | 319 | _enter(",%d", conn->debug_id); |
17926a79 DH |
320 | |
321 | ASSERT(rx != NULL); | |
322 | ||
843099ca | 323 | candidate = rxrpc_alloc_call(GFP_NOIO); |
17926a79 DH |
324 | if (!candidate) |
325 | return ERR_PTR(-EBUSY); | |
326 | ||
fff72429 DH |
327 | trace_rxrpc_call(candidate, rxrpc_call_new_service, |
328 | atomic_read(&candidate->usage), 0, here, NULL); | |
e34d4234 | 329 | |
a1399f8b | 330 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
42886ffe | 331 | candidate->conn = conn; |
df5d8bf7 | 332 | candidate->peer = conn->params.peer; |
42886ffe DH |
333 | candidate->cid = sp->hdr.cid; |
334 | candidate->call_id = sp->hdr.callNumber; | |
278ac0cd | 335 | candidate->security_ix = sp->hdr.securityIndex; |
42886ffe DH |
336 | candidate->rx_data_post = 0; |
337 | candidate->state = RXRPC_CALL_SERVER_ACCEPTING; | |
dabe5a79 | 338 | candidate->flags |= (1 << RXRPC_CALL_IS_SERVICE); |
17926a79 DH |
339 | if (conn->security_ix > 0) |
340 | candidate->state = RXRPC_CALL_SERVER_SECURING; | |
8d94aa38 | 341 | rcu_assign_pointer(candidate->socket, rx); |
17926a79 | 342 | |
a1399f8b | 343 | spin_lock(&conn->channel_lock); |
17926a79 DH |
344 | |
345 | /* set the channel for this call */ | |
a1399f8b DH |
346 | call = rcu_dereference_protected(conn->channels[chan].call, |
347 | lockdep_is_held(&conn->channel_lock)); | |
348 | ||
01a90a45 | 349 | _debug("channel[%u] is %p", candidate->cid & RXRPC_CHANNELMASK, call); |
42886ffe | 350 | if (call && call->call_id == sp->hdr.callNumber) { |
17926a79 DH |
351 | /* already set; must've been a duplicate packet */ |
352 | _debug("extant call [%d]", call->state); | |
353 | ASSERTCMP(call->conn, ==, conn); | |
354 | ||
355 | read_lock(&call->state_lock); | |
356 | switch (call->state) { | |
357 | case RXRPC_CALL_LOCALLY_ABORTED: | |
4c198ad1 | 358 | if (!test_and_set_bit(RXRPC_CALL_EV_ABORT, &call->events)) |
651350d1 | 359 | rxrpc_queue_call(call); |
17926a79 DH |
360 | case RXRPC_CALL_REMOTELY_ABORTED: |
361 | read_unlock(&call->state_lock); | |
362 | goto aborted_call; | |
363 | default: | |
fff72429 | 364 | rxrpc_get_call(call, rxrpc_call_got); |
17926a79 DH |
365 | read_unlock(&call->state_lock); |
366 | goto extant_call; | |
367 | } | |
368 | } | |
369 | ||
370 | if (call) { | |
371 | /* it seems the channel is still in use from the previous call | |
372 | * - ditch the old binding if its call is now complete */ | |
373 | _debug("CALL: %u { %s }", | |
374 | call->debug_id, rxrpc_call_states[call->state]); | |
375 | ||
f5c17aae | 376 | if (call->state == RXRPC_CALL_COMPLETE) { |
45025bce | 377 | __rxrpc_disconnect_call(conn, call); |
17926a79 | 378 | } else { |
a1399f8b | 379 | spin_unlock(&conn->channel_lock); |
17926a79 DH |
380 | kmem_cache_free(rxrpc_call_jar, candidate); |
381 | _leave(" = -EBUSY"); | |
382 | return ERR_PTR(-EBUSY); | |
383 | } | |
384 | } | |
385 | ||
386 | /* check the call number isn't duplicate */ | |
387 | _debug("check dup"); | |
42886ffe | 388 | call_id = sp->hdr.callNumber; |
a1399f8b DH |
389 | |
390 | /* We just ignore calls prior to the current call ID. Terminated calls | |
391 | * are handled via the connection. | |
392 | */ | |
393 | if (call_id <= conn->channels[chan].call_counter) | |
394 | goto old_call; /* TODO: Just drop packet */ | |
17926a79 DH |
395 | |
396 | /* make the call available */ | |
397 | _debug("new call"); | |
398 | call = candidate; | |
399 | candidate = NULL; | |
a1399f8b DH |
400 | conn->channels[chan].call_counter = call_id; |
401 | rcu_assign_pointer(conn->channels[chan].call, call); | |
5627cc8b | 402 | rxrpc_get_connection(conn); |
df5d8bf7 | 403 | rxrpc_get_peer(call->peer); |
a1399f8b | 404 | spin_unlock(&conn->channel_lock); |
17926a79 | 405 | |
85f32278 DH |
406 | spin_lock(&conn->params.peer->lock); |
407 | hlist_add_head(&call->error_link, &conn->params.peer->error_targets); | |
408 | spin_unlock(&conn->params.peer->lock); | |
17926a79 DH |
409 | |
410 | write_lock_bh(&rxrpc_call_lock); | |
411 | list_add_tail(&call->link, &rxrpc_calls); | |
412 | write_unlock_bh(&rxrpc_call_lock); | |
413 | ||
19ffa01c | 414 | call->service_id = conn->params.service_id; |
7727640c | 415 | |
17926a79 DH |
416 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
417 | ||
5873c083 | 418 | call->lifetimer.expires = jiffies + rxrpc_max_call_lifetime; |
17926a79 DH |
419 | add_timer(&call->lifetimer); |
420 | _leave(" = %p {%d} [new]", call, call->debug_id); | |
421 | return call; | |
422 | ||
423 | extant_call: | |
a1399f8b | 424 | spin_unlock(&conn->channel_lock); |
17926a79 DH |
425 | kmem_cache_free(rxrpc_call_jar, candidate); |
426 | _leave(" = %p {%d} [extant]", call, call ? call->debug_id : -1); | |
427 | return call; | |
428 | ||
429 | aborted_call: | |
a1399f8b | 430 | spin_unlock(&conn->channel_lock); |
17926a79 DH |
431 | kmem_cache_free(rxrpc_call_jar, candidate); |
432 | _leave(" = -ECONNABORTED"); | |
433 | return ERR_PTR(-ECONNABORTED); | |
434 | ||
435 | old_call: | |
a1399f8b | 436 | spin_unlock(&conn->channel_lock); |
17926a79 DH |
437 | kmem_cache_free(rxrpc_call_jar, candidate); |
438 | _leave(" = -ECONNRESET [old]"); | |
439 | return ERR_PTR(-ECONNRESET); | |
440 | } | |
441 | ||
8d94aa38 DH |
442 | /* |
443 | * Queue a call's work processor, getting a ref to pass to the work queue. | |
444 | */ | |
445 | bool rxrpc_queue_call(struct rxrpc_call *call) | |
446 | { | |
447 | const void *here = __builtin_return_address(0); | |
448 | int n = __atomic_add_unless(&call->usage, 1, 0); | |
449 | int m = atomic_read(&call->skb_count); | |
450 | if (n == 0) | |
451 | return false; | |
452 | if (rxrpc_queue_work(&call->processor)) | |
453 | trace_rxrpc_call(call, rxrpc_call_queued, n + 1, m, here, NULL); | |
454 | else | |
455 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
456 | return true; | |
457 | } | |
458 | ||
459 | /* | |
460 | * Queue a call's work processor, passing the callers ref to the work queue. | |
461 | */ | |
462 | bool __rxrpc_queue_call(struct rxrpc_call *call) | |
463 | { | |
464 | const void *here = __builtin_return_address(0); | |
465 | int n = atomic_read(&call->usage); | |
466 | int m = atomic_read(&call->skb_count); | |
467 | ASSERTCMP(n, >=, 1); | |
468 | if (rxrpc_queue_work(&call->processor)) | |
469 | trace_rxrpc_call(call, rxrpc_call_queued_ref, n, m, here, NULL); | |
470 | else | |
471 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
472 | return true; | |
473 | } | |
474 | ||
e34d4234 DH |
475 | /* |
476 | * Note the re-emergence of a call. | |
477 | */ | |
478 | void rxrpc_see_call(struct rxrpc_call *call) | |
479 | { | |
480 | const void *here = __builtin_return_address(0); | |
481 | if (call) { | |
482 | int n = atomic_read(&call->usage); | |
483 | int m = atomic_read(&call->skb_count); | |
484 | ||
fff72429 | 485 | trace_rxrpc_call(call, rxrpc_call_seen, n, m, here, NULL); |
e34d4234 DH |
486 | } |
487 | } | |
488 | ||
489 | /* | |
490 | * Note the addition of a ref on a call. | |
491 | */ | |
fff72429 | 492 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
e34d4234 DH |
493 | { |
494 | const void *here = __builtin_return_address(0); | |
495 | int n = atomic_inc_return(&call->usage); | |
496 | int m = atomic_read(&call->skb_count); | |
497 | ||
fff72429 | 498 | trace_rxrpc_call(call, op, n, m, here, NULL); |
e34d4234 DH |
499 | } |
500 | ||
501 | /* | |
502 | * Note the addition of a ref on a call for a socket buffer. | |
503 | */ | |
504 | void rxrpc_get_call_for_skb(struct rxrpc_call *call, struct sk_buff *skb) | |
505 | { | |
506 | const void *here = __builtin_return_address(0); | |
507 | int n = atomic_inc_return(&call->usage); | |
508 | int m = atomic_inc_return(&call->skb_count); | |
509 | ||
fff72429 | 510 | trace_rxrpc_call(call, rxrpc_call_got_skb, n, m, here, skb); |
e34d4234 DH |
511 | } |
512 | ||
17926a79 DH |
513 | /* |
514 | * detach a call from a socket and set up for release | |
515 | */ | |
8d94aa38 | 516 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
17926a79 | 517 | { |
17926a79 DH |
518 | _enter("{%d,%d,%d,%d}", |
519 | call->debug_id, atomic_read(&call->usage), | |
520 | atomic_read(&call->ackr_not_idle), | |
521 | call->rx_first_oos); | |
522 | ||
e34d4234 DH |
523 | rxrpc_see_call(call); |
524 | ||
17926a79 DH |
525 | spin_lock_bh(&call->lock); |
526 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
527 | BUG(); | |
528 | spin_unlock_bh(&call->lock); | |
529 | ||
530 | /* dissociate from the socket | |
531 | * - the socket's ref on the call is passed to the death timer | |
532 | */ | |
8d94aa38 | 533 | _debug("RELEASE CALL %p (%d)", call, call->debug_id); |
17926a79 | 534 | |
f4fdb352 DH |
535 | if (call->peer) { |
536 | spin_lock(&call->peer->lock); | |
537 | hlist_del_init(&call->error_link); | |
538 | spin_unlock(&call->peer->lock); | |
539 | } | |
e653cfe4 | 540 | |
17926a79 DH |
541 | write_lock_bh(&rx->call_lock); |
542 | if (!list_empty(&call->accept_link)) { | |
543 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", | |
544 | call, call->events, call->flags); | |
545 | ASSERT(!test_bit(RXRPC_CALL_HAS_USERID, &call->flags)); | |
546 | list_del_init(&call->accept_link); | |
547 | sk_acceptq_removed(&rx->sk); | |
548 | } else if (test_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
549 | rb_erase(&call->sock_node, &rx->calls); | |
550 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
551 | clear_bit(RXRPC_CALL_HAS_USERID, &call->flags); | |
8d94aa38 | 552 | rxrpc_put_call(call, rxrpc_call_put_userid); |
17926a79 DH |
553 | } |
554 | write_unlock_bh(&rx->call_lock); | |
555 | ||
17926a79 | 556 | /* free up the channel for reuse */ |
8d94aa38 DH |
557 | if (call->state == RXRPC_CALL_CLIENT_FINAL_ACK) { |
558 | clear_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); | |
559 | rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ACK); | |
560 | rxrpc_call_completed(call); | |
561 | } else { | |
562 | write_lock_bh(&call->state_lock); | |
563 | ||
564 | if (call->state < RXRPC_CALL_COMPLETE) { | |
565 | _debug("+++ ABORTING STATE %d +++\n", call->state); | |
5a42976d | 566 | __rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET); |
8d94aa38 DH |
567 | clear_bit(RXRPC_CALL_EV_ACK_FINAL, &call->events); |
568 | rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT); | |
569 | } | |
651350d1 | 570 | |
8d94aa38 | 571 | write_unlock_bh(&call->state_lock); |
17926a79 | 572 | } |
17926a79 | 573 | |
8d94aa38 DH |
574 | if (call->conn) |
575 | rxrpc_disconnect_call(call); | |
e653cfe4 | 576 | |
651350d1 | 577 | /* clean up the Rx queue */ |
17926a79 DH |
578 | if (!skb_queue_empty(&call->rx_queue) || |
579 | !skb_queue_empty(&call->rx_oos_queue)) { | |
580 | struct rxrpc_skb_priv *sp; | |
581 | struct sk_buff *skb; | |
582 | ||
583 | _debug("purge Rx queues"); | |
584 | ||
585 | spin_lock_bh(&call->lock); | |
586 | while ((skb = skb_dequeue(&call->rx_queue)) || | |
587 | (skb = skb_dequeue(&call->rx_oos_queue))) { | |
17926a79 DH |
588 | spin_unlock_bh(&call->lock); |
589 | ||
55cae7a4 | 590 | sp = rxrpc_skb(skb); |
17926a79 DH |
591 | _debug("- zap %s %%%u #%u", |
592 | rxrpc_pkts[sp->hdr.type], | |
0d12f8a4 | 593 | sp->hdr.serial, sp->hdr.seq); |
17926a79 DH |
594 | rxrpc_free_skb(skb); |
595 | spin_lock_bh(&call->lock); | |
596 | } | |
597 | spin_unlock_bh(&call->lock); | |
17926a79 | 598 | } |
8d94aa38 | 599 | rxrpc_purge_queue(&call->knlrecv_queue); |
17926a79 DH |
600 | |
601 | del_timer_sync(&call->resend_timer); | |
602 | del_timer_sync(&call->ack_timer); | |
603 | del_timer_sync(&call->lifetimer); | |
17926a79 DH |
604 | |
605 | _leave(""); | |
606 | } | |
607 | ||
17926a79 DH |
608 | /* |
609 | * release all the calls associated with a socket | |
610 | */ | |
611 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
612 | { | |
613 | struct rxrpc_call *call; | |
614 | struct rb_node *p; | |
615 | ||
616 | _enter("%p", rx); | |
617 | ||
618 | read_lock_bh(&rx->call_lock); | |
619 | ||
17926a79 DH |
620 | /* kill the not-yet-accepted incoming calls */ |
621 | list_for_each_entry(call, &rx->secureq, accept_link) { | |
8d94aa38 | 622 | rxrpc_release_call(rx, call); |
17926a79 DH |
623 | } |
624 | ||
625 | list_for_each_entry(call, &rx->acceptq, accept_link) { | |
8d94aa38 | 626 | rxrpc_release_call(rx, call); |
17926a79 DH |
627 | } |
628 | ||
f36b5e44 DH |
629 | /* mark all the calls as no longer wanting incoming packets */ |
630 | for (p = rb_first(&rx->calls); p; p = rb_next(p)) { | |
631 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
8d94aa38 | 632 | rxrpc_release_call(rx, call); |
f36b5e44 DH |
633 | } |
634 | ||
17926a79 DH |
635 | read_unlock_bh(&rx->call_lock); |
636 | _leave(""); | |
637 | } | |
638 | ||
639 | /* | |
640 | * release a call | |
641 | */ | |
fff72429 | 642 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
17926a79 | 643 | { |
e34d4234 DH |
644 | const void *here = __builtin_return_address(0); |
645 | int n, m; | |
17926a79 | 646 | |
e34d4234 | 647 | ASSERT(call != NULL); |
17926a79 | 648 | |
e34d4234 DH |
649 | n = atomic_dec_return(&call->usage); |
650 | m = atomic_read(&call->skb_count); | |
fff72429 | 651 | trace_rxrpc_call(call, op, n, m, here, NULL); |
e34d4234 DH |
652 | ASSERTCMP(n, >=, 0); |
653 | if (n == 0) { | |
654 | _debug("call %d dead", call->debug_id); | |
655 | WARN_ON(m != 0); | |
8d94aa38 | 656 | rxrpc_cleanup_call(call); |
e34d4234 DH |
657 | } |
658 | } | |
17926a79 | 659 | |
e34d4234 DH |
660 | /* |
661 | * Release a call ref held by a socket buffer. | |
662 | */ | |
663 | void rxrpc_put_call_for_skb(struct rxrpc_call *call, struct sk_buff *skb) | |
664 | { | |
665 | const void *here = __builtin_return_address(0); | |
666 | int n, m; | |
667 | ||
668 | n = atomic_dec_return(&call->usage); | |
669 | m = atomic_dec_return(&call->skb_count); | |
fff72429 | 670 | trace_rxrpc_call(call, rxrpc_call_put_skb, n, m, here, skb); |
e34d4234 DH |
671 | ASSERTCMP(n, >=, 0); |
672 | if (n == 0) { | |
17926a79 | 673 | _debug("call %d dead", call->debug_id); |
e34d4234 | 674 | WARN_ON(m != 0); |
8d94aa38 | 675 | rxrpc_cleanup_call(call); |
17926a79 | 676 | } |
17926a79 DH |
677 | } |
678 | ||
dee46364 DH |
679 | /* |
680 | * Final call destruction under RCU. | |
681 | */ | |
682 | static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) | |
683 | { | |
684 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); | |
685 | ||
686 | rxrpc_purge_queue(&call->rx_queue); | |
d001648e | 687 | rxrpc_purge_queue(&call->knlrecv_queue); |
df5d8bf7 | 688 | rxrpc_put_peer(call->peer); |
dee46364 DH |
689 | kmem_cache_free(rxrpc_call_jar, call); |
690 | } | |
691 | ||
17926a79 DH |
692 | /* |
693 | * clean up a call | |
694 | */ | |
695 | static void rxrpc_cleanup_call(struct rxrpc_call *call) | |
696 | { | |
697 | _net("DESTROY CALL %d", call->debug_id); | |
698 | ||
8d94aa38 DH |
699 | write_lock_bh(&rxrpc_call_lock); |
700 | list_del_init(&call->link); | |
701 | write_unlock_bh(&rxrpc_call_lock); | |
17926a79 DH |
702 | |
703 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); | |
704 | ||
705 | del_timer_sync(&call->lifetimer); | |
17926a79 DH |
706 | del_timer_sync(&call->ack_timer); |
707 | del_timer_sync(&call->resend_timer); | |
708 | ||
8d94aa38 | 709 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 710 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
8d94aa38 | 711 | ASSERT(!work_pending(&call->processor)); |
e653cfe4 | 712 | ASSERTCMP(call->conn, ==, NULL); |
17926a79 DH |
713 | |
714 | if (call->acks_window) { | |
715 | _debug("kill Tx window %d", | |
716 | CIRC_CNT(call->acks_head, call->acks_tail, | |
717 | call->acks_winsz)); | |
718 | smp_mb(); | |
719 | while (CIRC_CNT(call->acks_head, call->acks_tail, | |
720 | call->acks_winsz) > 0) { | |
721 | struct rxrpc_skb_priv *sp; | |
722 | unsigned long _skb; | |
723 | ||
724 | _skb = call->acks_window[call->acks_tail] & ~1; | |
0d12f8a4 DH |
725 | sp = rxrpc_skb((struct sk_buff *)_skb); |
726 | _debug("+++ clear Tx %u", sp->hdr.seq); | |
727 | rxrpc_free_skb((struct sk_buff *)_skb); | |
17926a79 DH |
728 | call->acks_tail = |
729 | (call->acks_tail + 1) & (call->acks_winsz - 1); | |
730 | } | |
731 | ||
732 | kfree(call->acks_window); | |
733 | } | |
734 | ||
735 | rxrpc_free_skb(call->tx_pending); | |
736 | ||
737 | rxrpc_purge_queue(&call->rx_queue); | |
738 | ASSERT(skb_queue_empty(&call->rx_oos_queue)); | |
d001648e | 739 | rxrpc_purge_queue(&call->knlrecv_queue); |
dee46364 | 740 | call_rcu(&call->rcu, rxrpc_rcu_destroy_call); |
17926a79 DH |
741 | } |
742 | ||
743 | /* | |
8d94aa38 | 744 | * Make sure that all calls are gone. |
17926a79 DH |
745 | */ |
746 | void __exit rxrpc_destroy_all_calls(void) | |
747 | { | |
748 | struct rxrpc_call *call; | |
749 | ||
750 | _enter(""); | |
8d94aa38 DH |
751 | |
752 | if (list_empty(&rxrpc_calls)) | |
753 | return; | |
754 | ||
17926a79 DH |
755 | write_lock_bh(&rxrpc_call_lock); |
756 | ||
757 | while (!list_empty(&rxrpc_calls)) { | |
758 | call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); | |
759 | _debug("Zapping call %p", call); | |
760 | ||
e34d4234 | 761 | rxrpc_see_call(call); |
17926a79 DH |
762 | list_del_init(&call->link); |
763 | ||
8d94aa38 DH |
764 | pr_err("Call %p still in use (%d,%d,%s,%lx,%lx)!\n", |
765 | call, atomic_read(&call->usage), | |
766 | atomic_read(&call->ackr_not_idle), | |
767 | rxrpc_call_states[call->state], | |
768 | call->flags, call->events); | |
769 | if (!skb_queue_empty(&call->rx_queue)) | |
770 | pr_err("Rx queue occupied\n"); | |
771 | if (!skb_queue_empty(&call->rx_oos_queue)) | |
772 | pr_err("OOS queue occupied\n"); | |
17926a79 DH |
773 | |
774 | write_unlock_bh(&rxrpc_call_lock); | |
775 | cond_resched(); | |
776 | write_lock_bh(&rxrpc_call_lock); | |
777 | } | |
778 | ||
779 | write_unlock_bh(&rxrpc_call_lock); | |
780 | _leave(""); | |
781 | } | |
782 | ||
783 | /* | |
784 | * handle call lifetime being exceeded | |
785 | */ | |
786 | static void rxrpc_call_life_expired(unsigned long _call) | |
787 | { | |
788 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
789 | ||
f5c17aae DH |
790 | _enter("{%d}", call->debug_id); |
791 | ||
e34d4234 | 792 | rxrpc_see_call(call); |
17926a79 DH |
793 | if (call->state >= RXRPC_CALL_COMPLETE) |
794 | return; | |
795 | ||
f5c17aae DH |
796 | set_bit(RXRPC_CALL_EV_LIFE_TIMER, &call->events); |
797 | rxrpc_queue_call(call); | |
17926a79 DH |
798 | } |
799 | ||
800 | /* | |
801 | * handle resend timer expiry | |
3b5bac2b | 802 | * - may not take call->state_lock as this can deadlock against del_timer_sync() |
17926a79 DH |
803 | */ |
804 | static void rxrpc_resend_time_expired(unsigned long _call) | |
805 | { | |
806 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
807 | ||
808 | _enter("{%d}", call->debug_id); | |
809 | ||
e34d4234 | 810 | rxrpc_see_call(call); |
17926a79 DH |
811 | if (call->state >= RXRPC_CALL_COMPLETE) |
812 | return; | |
813 | ||
17926a79 | 814 | clear_bit(RXRPC_CALL_RUN_RTIMER, &call->flags); |
4c198ad1 | 815 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND_TIMER, &call->events)) |
651350d1 | 816 | rxrpc_queue_call(call); |
17926a79 DH |
817 | } |
818 | ||
819 | /* | |
820 | * handle ACK timer expiry | |
821 | */ | |
822 | static void rxrpc_ack_time_expired(unsigned long _call) | |
823 | { | |
824 | struct rxrpc_call *call = (struct rxrpc_call *) _call; | |
825 | ||
826 | _enter("{%d}", call->debug_id); | |
827 | ||
e34d4234 | 828 | rxrpc_see_call(call); |
17926a79 DH |
829 | if (call->state >= RXRPC_CALL_COMPLETE) |
830 | return; | |
831 | ||
f5c17aae | 832 | if (!test_and_set_bit(RXRPC_CALL_EV_ACK, &call->events)) |
651350d1 | 833 | rxrpc_queue_call(call); |
17926a79 | 834 | } |