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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 | 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", | |
00e90712 | 33 | [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", |
1f8481d1 DH |
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_REMOTELY_ABORTED] = "RmtAbort", |
46 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
f5c17aae | 47 | [RXRPC_CALL_LOCAL_ERROR] = "LocError", |
1f8481d1 | 48 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", |
1f8481d1 DH |
49 | }; |
50 | ||
fff72429 DH |
51 | const char rxrpc_call_traces[rxrpc_call__nr_trace][4] = { |
52 | [rxrpc_call_new_client] = "NWc", | |
53 | [rxrpc_call_new_service] = "NWs", | |
54 | [rxrpc_call_queued] = "QUE", | |
55 | [rxrpc_call_queued_ref] = "QUR", | |
a84a46d7 DH |
56 | [rxrpc_call_connected] = "CON", |
57 | [rxrpc_call_release] = "RLS", | |
fff72429 DH |
58 | [rxrpc_call_seen] = "SEE", |
59 | [rxrpc_call_got] = "GOT", | |
fff72429 | 60 | [rxrpc_call_got_userid] = "Gus", |
cbd00891 | 61 | [rxrpc_call_got_kernel] = "Gke", |
fff72429 | 62 | [rxrpc_call_put] = "PUT", |
fff72429 | 63 | [rxrpc_call_put_userid] = "Pus", |
cbd00891 | 64 | [rxrpc_call_put_kernel] = "Pke", |
fff72429 | 65 | [rxrpc_call_put_noqueue] = "PNQ", |
a84a46d7 | 66 | [rxrpc_call_error] = "*E*", |
fff72429 DH |
67 | }; |
68 | ||
17926a79 DH |
69 | struct kmem_cache *rxrpc_call_jar; |
70 | LIST_HEAD(rxrpc_calls); | |
71 | DEFINE_RWLOCK(rxrpc_call_lock); | |
17926a79 | 72 | |
248f219c DH |
73 | static void rxrpc_call_timer_expired(unsigned long _call) |
74 | { | |
75 | struct rxrpc_call *call = (struct rxrpc_call *)_call; | |
76 | ||
77 | _enter("%d", call->debug_id); | |
78 | ||
fc7ab6d2 DH |
79 | if (call->state < RXRPC_CALL_COMPLETE) { |
80 | trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); | |
248f219c | 81 | rxrpc_queue_call(call); |
fc7ab6d2 | 82 | } |
248f219c | 83 | } |
17926a79 | 84 | |
2341e077 DH |
85 | /* |
86 | * find an extant server call | |
87 | * - called in process context with IRQs enabled | |
88 | */ | |
89 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, | |
90 | unsigned long user_call_ID) | |
91 | { | |
92 | struct rxrpc_call *call; | |
93 | struct rb_node *p; | |
94 | ||
95 | _enter("%p,%lx", rx, user_call_ID); | |
96 | ||
97 | read_lock(&rx->call_lock); | |
98 | ||
99 | p = rx->calls.rb_node; | |
100 | while (p) { | |
101 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
102 | ||
103 | if (user_call_ID < call->user_call_ID) | |
104 | p = p->rb_left; | |
105 | else if (user_call_ID > call->user_call_ID) | |
106 | p = p->rb_right; | |
107 | else | |
108 | goto found_extant_call; | |
109 | } | |
110 | ||
111 | read_unlock(&rx->call_lock); | |
112 | _leave(" = NULL"); | |
113 | return NULL; | |
114 | ||
115 | found_extant_call: | |
fff72429 | 116 | rxrpc_get_call(call, rxrpc_call_got); |
2341e077 DH |
117 | read_unlock(&rx->call_lock); |
118 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); | |
119 | return call; | |
120 | } | |
121 | ||
17926a79 DH |
122 | /* |
123 | * allocate a new call | |
124 | */ | |
00e90712 | 125 | struct rxrpc_call *rxrpc_alloc_call(gfp_t gfp) |
17926a79 DH |
126 | { |
127 | struct rxrpc_call *call; | |
128 | ||
129 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
130 | if (!call) | |
131 | return NULL; | |
132 | ||
248f219c DH |
133 | call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, |
134 | sizeof(struct sk_buff *), | |
17926a79 | 135 | gfp); |
248f219c DH |
136 | if (!call->rxtx_buffer) |
137 | goto nomem; | |
17926a79 | 138 | |
248f219c DH |
139 | call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); |
140 | if (!call->rxtx_annotations) | |
141 | goto nomem_2; | |
142 | ||
143 | setup_timer(&call->timer, rxrpc_call_timer_expired, | |
144 | (unsigned long)call); | |
17926a79 | 145 | INIT_WORK(&call->processor, &rxrpc_process_call); |
999b69f8 | 146 | INIT_LIST_HEAD(&call->link); |
45025bce | 147 | INIT_LIST_HEAD(&call->chan_wait_link); |
17926a79 | 148 | INIT_LIST_HEAD(&call->accept_link); |
248f219c DH |
149 | INIT_LIST_HEAD(&call->recvmsg_link); |
150 | INIT_LIST_HEAD(&call->sock_link); | |
45025bce | 151 | init_waitqueue_head(&call->waitq); |
17926a79 DH |
152 | spin_lock_init(&call->lock); |
153 | rwlock_init(&call->state_lock); | |
154 | atomic_set(&call->usage, 1); | |
155 | call->debug_id = atomic_inc_return(&rxrpc_debug_id); | |
17926a79 DH |
156 | |
157 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
158 | ||
248f219c | 159 | /* Leave space in the ring to handle a maxed-out jumbo packet */ |
75e42126 | 160 | call->rx_winsize = rxrpc_rx_window_size; |
248f219c DH |
161 | call->tx_winsize = 16; |
162 | call->rx_expect_next = 1; | |
57494343 DH |
163 | |
164 | if (RXRPC_TX_SMSS > 2190) | |
165 | call->cong_cwnd = 2; | |
166 | else if (RXRPC_TX_SMSS > 1095) | |
167 | call->cong_cwnd = 3; | |
168 | else | |
169 | call->cong_cwnd = 4; | |
170 | call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; | |
17926a79 | 171 | return call; |
248f219c DH |
172 | |
173 | nomem_2: | |
174 | kfree(call->rxtx_buffer); | |
175 | nomem: | |
176 | kmem_cache_free(rxrpc_call_jar, call); | |
177 | return NULL; | |
17926a79 DH |
178 | } |
179 | ||
180 | /* | |
999b69f8 | 181 | * Allocate a new client call. |
17926a79 | 182 | */ |
248f219c | 183 | static struct rxrpc_call *rxrpc_alloc_client_call(struct sockaddr_rxrpc *srx, |
aa390bbe | 184 | gfp_t gfp) |
17926a79 DH |
185 | { |
186 | struct rxrpc_call *call; | |
57494343 | 187 | ktime_t now; |
17926a79 DH |
188 | |
189 | _enter(""); | |
190 | ||
17926a79 DH |
191 | call = rxrpc_alloc_call(gfp); |
192 | if (!call) | |
193 | return ERR_PTR(-ENOMEM); | |
999b69f8 | 194 | call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; |
999b69f8 | 195 | call->service_id = srx->srx_service; |
71f3ca40 | 196 | call->tx_phase = true; |
57494343 DH |
197 | now = ktime_get_real(); |
198 | call->acks_latest_ts = now; | |
199 | call->cong_tstamp = now; | |
999b69f8 DH |
200 | |
201 | _leave(" = %p", call); | |
202 | return call; | |
203 | } | |
204 | ||
205 | /* | |
248f219c | 206 | * Initiate the call ack/resend/expiry timer. |
999b69f8 | 207 | */ |
248f219c | 208 | static void rxrpc_start_call_timer(struct rxrpc_call *call) |
999b69f8 | 209 | { |
248f219c DH |
210 | unsigned long expire_at; |
211 | ||
212 | expire_at = jiffies + rxrpc_max_call_lifetime; | |
213 | call->expire_at = expire_at; | |
214 | call->ack_at = expire_at; | |
215 | call->resend_at = expire_at; | |
01a88f7f | 216 | call->timer.expires = expire_at + 1; |
fc7ab6d2 | 217 | rxrpc_set_timer(call, rxrpc_timer_begin); |
17926a79 DH |
218 | } |
219 | ||
220 | /* | |
221 | * set up a call for the given data | |
222 | * - called in process context with IRQs enabled | |
223 | */ | |
2341e077 | 224 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
19ffa01c | 225 | struct rxrpc_conn_parameters *cp, |
999b69f8 | 226 | struct sockaddr_rxrpc *srx, |
17926a79 | 227 | unsigned long user_call_ID, |
17926a79 DH |
228 | gfp_t gfp) |
229 | { | |
2341e077 DH |
230 | struct rxrpc_call *call, *xcall; |
231 | struct rb_node *parent, **pp; | |
e34d4234 | 232 | const void *here = __builtin_return_address(0); |
999b69f8 | 233 | int ret; |
17926a79 | 234 | |
999b69f8 | 235 | _enter("%p,%lx", rx, user_call_ID); |
17926a79 | 236 | |
248f219c | 237 | call = rxrpc_alloc_client_call(srx, gfp); |
2341e077 DH |
238 | if (IS_ERR(call)) { |
239 | _leave(" = %ld", PTR_ERR(call)); | |
240 | return call; | |
17926a79 DH |
241 | } |
242 | ||
a84a46d7 DH |
243 | trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), |
244 | here, (const void *)user_call_ID); | |
e34d4234 | 245 | |
999b69f8 | 246 | /* Publish the call, even though it is incompletely set up as yet */ |
17926a79 DH |
247 | write_lock(&rx->call_lock); |
248 | ||
249 | pp = &rx->calls.rb_node; | |
250 | parent = NULL; | |
251 | while (*pp) { | |
252 | parent = *pp; | |
2341e077 | 253 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 254 | |
2341e077 | 255 | if (user_call_ID < xcall->user_call_ID) |
17926a79 | 256 | pp = &(*pp)->rb_left; |
2341e077 | 257 | else if (user_call_ID > xcall->user_call_ID) |
17926a79 DH |
258 | pp = &(*pp)->rb_right; |
259 | else | |
357f5ef6 | 260 | goto error_dup_user_ID; |
17926a79 DH |
261 | } |
262 | ||
248f219c | 263 | rcu_assign_pointer(call->socket, rx); |
357f5ef6 DH |
264 | call->user_call_ID = user_call_ID; |
265 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); | |
fff72429 | 266 | rxrpc_get_call(call, rxrpc_call_got_userid); |
17926a79 DH |
267 | rb_link_node(&call->sock_node, parent, pp); |
268 | rb_insert_color(&call->sock_node, &rx->calls); | |
248f219c DH |
269 | list_add(&call->sock_link, &rx->sock_calls); |
270 | ||
17926a79 DH |
271 | write_unlock(&rx->call_lock); |
272 | ||
248f219c | 273 | write_lock(&rxrpc_call_lock); |
17926a79 | 274 | list_add_tail(&call->link, &rxrpc_calls); |
248f219c | 275 | write_unlock(&rxrpc_call_lock); |
17926a79 | 276 | |
248f219c DH |
277 | /* Set up or get a connection record and set the protocol parameters, |
278 | * including channel number and call ID. | |
279 | */ | |
280 | ret = rxrpc_connect_call(call, cp, srx, gfp); | |
999b69f8 DH |
281 | if (ret < 0) |
282 | goto error; | |
283 | ||
a84a46d7 DH |
284 | trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), |
285 | here, ERR_PTR(ret)); | |
286 | ||
248f219c DH |
287 | spin_lock_bh(&call->conn->params.peer->lock); |
288 | hlist_add_head(&call->error_link, | |
289 | &call->conn->params.peer->error_targets); | |
290 | spin_unlock_bh(&call->conn->params.peer->lock); | |
291 | ||
292 | rxrpc_start_call_timer(call); | |
293 | ||
17926a79 DH |
294 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); |
295 | ||
296 | _leave(" = %p [new]", call); | |
297 | return call; | |
298 | ||
2341e077 DH |
299 | /* We unexpectedly found the user ID in the list after taking |
300 | * the call_lock. This shouldn't happen unless the user races | |
301 | * with itself and tries to add the same user ID twice at the | |
302 | * same time in different threads. | |
303 | */ | |
357f5ef6 | 304 | error_dup_user_ID: |
17926a79 | 305 | write_unlock(&rx->call_lock); |
8d94aa38 | 306 | ret = -EEXIST; |
357f5ef6 DH |
307 | |
308 | error: | |
309 | __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, | |
310 | RX_CALL_DEAD, ret); | |
a84a46d7 DH |
311 | trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), |
312 | here, ERR_PTR(ret)); | |
357f5ef6 DH |
313 | rxrpc_release_call(rx, call); |
314 | rxrpc_put_call(call, rxrpc_call_put); | |
315 | _leave(" = %d", ret); | |
316 | return ERR_PTR(ret); | |
17926a79 DH |
317 | } |
318 | ||
319 | /* | |
248f219c DH |
320 | * Set up an incoming call. call->conn points to the connection. |
321 | * This is called in BH context and isn't allowed to fail. | |
17926a79 | 322 | */ |
248f219c DH |
323 | void rxrpc_incoming_call(struct rxrpc_sock *rx, |
324 | struct rxrpc_call *call, | |
325 | struct sk_buff *skb) | |
17926a79 | 326 | { |
248f219c | 327 | struct rxrpc_connection *conn = call->conn; |
42886ffe | 328 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c | 329 | u32 chan; |
17926a79 | 330 | |
248f219c | 331 | _enter(",%d", call->conn->debug_id); |
e34d4234 | 332 | |
248f219c DH |
333 | rcu_assign_pointer(call->socket, rx); |
334 | call->call_id = sp->hdr.callNumber; | |
335 | call->service_id = sp->hdr.serviceId; | |
336 | call->cid = sp->hdr.cid; | |
337 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
338 | if (sp->hdr.securityIndex > 0) | |
339 | call->state = RXRPC_CALL_SERVER_SECURING; | |
57494343 | 340 | call->cong_tstamp = skb->tstamp; |
248f219c DH |
341 | |
342 | /* Set the channel for this call. We don't get channel_lock as we're | |
343 | * only defending against the data_ready handler (which we're called | |
344 | * from) and the RESPONSE packet parser (which is only really | |
345 | * interested in call_counter and can cope with a disagreement with the | |
346 | * call pointer). | |
a1399f8b | 347 | */ |
248f219c DH |
348 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
349 | conn->channels[chan].call_counter = call->call_id; | |
350 | conn->channels[chan].call_id = call->call_id; | |
a1399f8b | 351 | rcu_assign_pointer(conn->channels[chan].call, call); |
17926a79 | 352 | |
85f32278 DH |
353 | spin_lock(&conn->params.peer->lock); |
354 | hlist_add_head(&call->error_link, &conn->params.peer->error_targets); | |
355 | spin_unlock(&conn->params.peer->lock); | |
17926a79 | 356 | |
17926a79 DH |
357 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
358 | ||
248f219c DH |
359 | rxrpc_start_call_timer(call); |
360 | _leave(""); | |
17926a79 DH |
361 | } |
362 | ||
8d94aa38 DH |
363 | /* |
364 | * Queue a call's work processor, getting a ref to pass to the work queue. | |
365 | */ | |
366 | bool rxrpc_queue_call(struct rxrpc_call *call) | |
367 | { | |
368 | const void *here = __builtin_return_address(0); | |
369 | int n = __atomic_add_unless(&call->usage, 1, 0); | |
8d94aa38 DH |
370 | if (n == 0) |
371 | return false; | |
372 | if (rxrpc_queue_work(&call->processor)) | |
2ab27215 | 373 | trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); |
8d94aa38 DH |
374 | else |
375 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
376 | return true; | |
377 | } | |
378 | ||
379 | /* | |
380 | * Queue a call's work processor, passing the callers ref to the work queue. | |
381 | */ | |
382 | bool __rxrpc_queue_call(struct rxrpc_call *call) | |
383 | { | |
384 | const void *here = __builtin_return_address(0); | |
385 | int n = atomic_read(&call->usage); | |
8d94aa38 DH |
386 | ASSERTCMP(n, >=, 1); |
387 | if (rxrpc_queue_work(&call->processor)) | |
2ab27215 | 388 | trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); |
8d94aa38 DH |
389 | else |
390 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
391 | return true; | |
392 | } | |
393 | ||
e34d4234 DH |
394 | /* |
395 | * Note the re-emergence of a call. | |
396 | */ | |
397 | void rxrpc_see_call(struct rxrpc_call *call) | |
398 | { | |
399 | const void *here = __builtin_return_address(0); | |
400 | if (call) { | |
401 | int n = atomic_read(&call->usage); | |
e34d4234 | 402 | |
2ab27215 | 403 | trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); |
e34d4234 DH |
404 | } |
405 | } | |
406 | ||
407 | /* | |
408 | * Note the addition of a ref on a call. | |
409 | */ | |
fff72429 | 410 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
e34d4234 DH |
411 | { |
412 | const void *here = __builtin_return_address(0); | |
413 | int n = atomic_inc_return(&call->usage); | |
e34d4234 | 414 | |
2ab27215 | 415 | trace_rxrpc_call(call, op, n, here, NULL); |
e34d4234 DH |
416 | } |
417 | ||
418 | /* | |
248f219c | 419 | * Detach a call from its owning socket. |
e34d4234 | 420 | */ |
248f219c | 421 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
e34d4234 | 422 | { |
a84a46d7 | 423 | const void *here = __builtin_return_address(0); |
248f219c DH |
424 | struct rxrpc_connection *conn = call->conn; |
425 | bool put = false; | |
426 | int i; | |
e34d4234 | 427 | |
248f219c | 428 | _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); |
e34d4234 | 429 | |
a84a46d7 DH |
430 | trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), |
431 | here, (const void *)call->flags); | |
17926a79 | 432 | |
a84a46d7 | 433 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
e34d4234 | 434 | |
17926a79 DH |
435 | spin_lock_bh(&call->lock); |
436 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
437 | BUG(); | |
438 | spin_unlock_bh(&call->lock); | |
439 | ||
248f219c | 440 | del_timer_sync(&call->timer); |
17926a79 | 441 | |
248f219c DH |
442 | /* Make sure we don't get any more notifications */ |
443 | write_lock_bh(&rx->recvmsg_lock); | |
e653cfe4 | 444 | |
248f219c | 445 | if (!list_empty(&call->recvmsg_link)) { |
17926a79 DH |
446 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
447 | call, call->events, call->flags); | |
248f219c DH |
448 | list_del(&call->recvmsg_link); |
449 | put = true; | |
450 | } | |
451 | ||
452 | /* list_empty() must return false in rxrpc_notify_socket() */ | |
453 | call->recvmsg_link.next = NULL; | |
454 | call->recvmsg_link.prev = NULL; | |
455 | ||
456 | write_unlock_bh(&rx->recvmsg_lock); | |
457 | if (put) | |
458 | rxrpc_put_call(call, rxrpc_call_put); | |
459 | ||
460 | write_lock(&rx->call_lock); | |
461 | ||
462 | if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
17926a79 DH |
463 | rb_erase(&call->sock_node, &rx->calls); |
464 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
8d94aa38 | 465 | rxrpc_put_call(call, rxrpc_call_put_userid); |
17926a79 | 466 | } |
17926a79 | 467 | |
248f219c DH |
468 | list_del(&call->sock_link); |
469 | write_unlock(&rx->call_lock); | |
470 | ||
471 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); | |
472 | ||
473 | if (conn) | |
8d94aa38 | 474 | rxrpc_disconnect_call(call); |
e653cfe4 | 475 | |
248f219c | 476 | for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { |
71f3ca40 DH |
477 | rxrpc_free_skb(call->rxtx_buffer[i], |
478 | (call->tx_phase ? rxrpc_skb_tx_cleaned : | |
479 | rxrpc_skb_rx_cleaned)); | |
248f219c | 480 | call->rxtx_buffer[i] = NULL; |
17926a79 | 481 | } |
17926a79 DH |
482 | |
483 | _leave(""); | |
484 | } | |
485 | ||
17926a79 DH |
486 | /* |
487 | * release all the calls associated with a socket | |
488 | */ | |
489 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
490 | { | |
491 | struct rxrpc_call *call; | |
17926a79 DH |
492 | |
493 | _enter("%p", rx); | |
494 | ||
0360da6d DH |
495 | while (!list_empty(&rx->to_be_accepted)) { |
496 | call = list_entry(rx->to_be_accepted.next, | |
497 | struct rxrpc_call, accept_link); | |
498 | list_del(&call->accept_link); | |
499 | rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, ECONNRESET); | |
0360da6d DH |
500 | rxrpc_put_call(call, rxrpc_call_put); |
501 | } | |
502 | ||
248f219c DH |
503 | while (!list_empty(&rx->sock_calls)) { |
504 | call = list_entry(rx->sock_calls.next, | |
505 | struct rxrpc_call, sock_link); | |
506 | rxrpc_get_call(call, rxrpc_call_got); | |
507 | rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, ECONNRESET); | |
508 | rxrpc_send_call_packet(call, RXRPC_PACKET_TYPE_ABORT); | |
8d94aa38 | 509 | rxrpc_release_call(rx, call); |
248f219c | 510 | rxrpc_put_call(call, rxrpc_call_put); |
f36b5e44 DH |
511 | } |
512 | ||
17926a79 DH |
513 | _leave(""); |
514 | } | |
515 | ||
516 | /* | |
517 | * release a call | |
518 | */ | |
fff72429 | 519 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
17926a79 | 520 | { |
e34d4234 | 521 | const void *here = __builtin_return_address(0); |
2ab27215 | 522 | int n; |
17926a79 | 523 | |
e34d4234 | 524 | ASSERT(call != NULL); |
17926a79 | 525 | |
e34d4234 | 526 | n = atomic_dec_return(&call->usage); |
2ab27215 | 527 | trace_rxrpc_call(call, op, n, here, NULL); |
e34d4234 DH |
528 | ASSERTCMP(n, >=, 0); |
529 | if (n == 0) { | |
530 | _debug("call %d dead", call->debug_id); | |
248f219c | 531 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 532 | |
248f219c DH |
533 | write_lock(&rxrpc_call_lock); |
534 | list_del_init(&call->link); | |
535 | write_unlock(&rxrpc_call_lock); | |
e34d4234 | 536 | |
8d94aa38 | 537 | rxrpc_cleanup_call(call); |
17926a79 | 538 | } |
17926a79 DH |
539 | } |
540 | ||
dee46364 DH |
541 | /* |
542 | * Final call destruction under RCU. | |
543 | */ | |
544 | static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) | |
545 | { | |
546 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); | |
547 | ||
df5d8bf7 | 548 | rxrpc_put_peer(call->peer); |
248f219c DH |
549 | kfree(call->rxtx_buffer); |
550 | kfree(call->rxtx_annotations); | |
dee46364 DH |
551 | kmem_cache_free(rxrpc_call_jar, call); |
552 | } | |
553 | ||
17926a79 DH |
554 | /* |
555 | * clean up a call | |
556 | */ | |
00e90712 | 557 | void rxrpc_cleanup_call(struct rxrpc_call *call) |
17926a79 | 558 | { |
248f219c | 559 | int i; |
17926a79 | 560 | |
248f219c | 561 | _net("DESTROY CALL %d", call->debug_id); |
17926a79 DH |
562 | |
563 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); | |
564 | ||
248f219c | 565 | del_timer_sync(&call->timer); |
17926a79 | 566 | |
8d94aa38 | 567 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 568 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
e653cfe4 | 569 | ASSERTCMP(call->conn, ==, NULL); |
17926a79 | 570 | |
248f219c DH |
571 | /* Clean up the Rx/Tx buffer */ |
572 | for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) | |
71f3ca40 DH |
573 | rxrpc_free_skb(call->rxtx_buffer[i], |
574 | (call->tx_phase ? rxrpc_skb_tx_cleaned : | |
575 | rxrpc_skb_rx_cleaned)); | |
17926a79 | 576 | |
71f3ca40 | 577 | rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); |
17926a79 | 578 | |
dee46364 | 579 | call_rcu(&call->rcu, rxrpc_rcu_destroy_call); |
17926a79 DH |
580 | } |
581 | ||
582 | /* | |
8d94aa38 | 583 | * Make sure that all calls are gone. |
17926a79 DH |
584 | */ |
585 | void __exit rxrpc_destroy_all_calls(void) | |
586 | { | |
587 | struct rxrpc_call *call; | |
588 | ||
589 | _enter(""); | |
8d94aa38 DH |
590 | |
591 | if (list_empty(&rxrpc_calls)) | |
592 | return; | |
248f219c DH |
593 | |
594 | write_lock(&rxrpc_call_lock); | |
17926a79 DH |
595 | |
596 | while (!list_empty(&rxrpc_calls)) { | |
597 | call = list_entry(rxrpc_calls.next, struct rxrpc_call, link); | |
598 | _debug("Zapping call %p", call); | |
599 | ||
e34d4234 | 600 | rxrpc_see_call(call); |
17926a79 DH |
601 | list_del_init(&call->link); |
602 | ||
248f219c | 603 | pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", |
8d94aa38 | 604 | call, atomic_read(&call->usage), |
8d94aa38 DH |
605 | rxrpc_call_states[call->state], |
606 | call->flags, call->events); | |
17926a79 | 607 | |
248f219c | 608 | write_unlock(&rxrpc_call_lock); |
17926a79 | 609 | cond_resched(); |
248f219c | 610 | write_lock(&rxrpc_call_lock); |
17926a79 DH |
611 | } |
612 | ||
248f219c | 613 | write_unlock(&rxrpc_call_lock); |
17926a79 | 614 | } |