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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 | ||
5b8848d1 | 22 | const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { |
f5c17aae | 23 | [RXRPC_CALL_UNINITIALISED] = "Uninit ", |
999b69f8 | 24 | [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", |
1f8481d1 DH |
25 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
26 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", | |
27 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", | |
00e90712 | 28 | [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", |
1f8481d1 DH |
29 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", |
30 | [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", | |
31 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", | |
32 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", | |
33 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", | |
34 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", | |
35 | [RXRPC_CALL_COMPLETE] = "Complete", | |
f5c17aae DH |
36 | }; |
37 | ||
38 | const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { | |
39 | [RXRPC_CALL_SUCCEEDED] = "Complete", | |
1f8481d1 DH |
40 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", |
41 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
f5c17aae | 42 | [RXRPC_CALL_LOCAL_ERROR] = "LocError", |
1f8481d1 | 43 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", |
1f8481d1 DH |
44 | }; |
45 | ||
17926a79 | 46 | struct kmem_cache *rxrpc_call_jar; |
17926a79 | 47 | |
e99e88a9 | 48 | static void rxrpc_call_timer_expired(struct timer_list *t) |
248f219c | 49 | { |
e99e88a9 | 50 | struct rxrpc_call *call = from_timer(call, t, timer); |
248f219c DH |
51 | |
52 | _enter("%d", call->debug_id); | |
53 | ||
a158bdd3 DH |
54 | if (call->state < RXRPC_CALL_COMPLETE) { |
55 | trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); | |
56 | rxrpc_queue_call(call); | |
57 | } | |
248f219c | 58 | } |
17926a79 | 59 | |
9faaff59 DH |
60 | static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; |
61 | ||
2341e077 DH |
62 | /* |
63 | * find an extant server call | |
64 | * - called in process context with IRQs enabled | |
65 | */ | |
66 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, | |
67 | unsigned long user_call_ID) | |
68 | { | |
69 | struct rxrpc_call *call; | |
70 | struct rb_node *p; | |
71 | ||
72 | _enter("%p,%lx", rx, user_call_ID); | |
73 | ||
74 | read_lock(&rx->call_lock); | |
75 | ||
76 | p = rx->calls.rb_node; | |
77 | while (p) { | |
78 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
79 | ||
80 | if (user_call_ID < call->user_call_ID) | |
81 | p = p->rb_left; | |
82 | else if (user_call_ID > call->user_call_ID) | |
83 | p = p->rb_right; | |
84 | else | |
85 | goto found_extant_call; | |
86 | } | |
87 | ||
88 | read_unlock(&rx->call_lock); | |
89 | _leave(" = NULL"); | |
90 | return NULL; | |
91 | ||
92 | found_extant_call: | |
fff72429 | 93 | rxrpc_get_call(call, rxrpc_call_got); |
2341e077 DH |
94 | read_unlock(&rx->call_lock); |
95 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); | |
96 | return call; | |
97 | } | |
98 | ||
17926a79 DH |
99 | /* |
100 | * allocate a new call | |
101 | */ | |
a25e21f0 DH |
102 | struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, |
103 | unsigned int debug_id) | |
17926a79 DH |
104 | { |
105 | struct rxrpc_call *call; | |
d3be4d24 | 106 | struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); |
17926a79 DH |
107 | |
108 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
109 | if (!call) | |
110 | return NULL; | |
111 | ||
248f219c DH |
112 | call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, |
113 | sizeof(struct sk_buff *), | |
17926a79 | 114 | gfp); |
248f219c DH |
115 | if (!call->rxtx_buffer) |
116 | goto nomem; | |
17926a79 | 117 | |
248f219c DH |
118 | call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); |
119 | if (!call->rxtx_annotations) | |
120 | goto nomem_2; | |
121 | ||
540b1c48 | 122 | mutex_init(&call->user_mutex); |
9faaff59 DH |
123 | |
124 | /* Prevent lockdep reporting a deadlock false positive between the afs | |
125 | * filesystem and sys_sendmsg() via the mmap sem. | |
126 | */ | |
127 | if (rx->sk.sk_kern_sock) | |
128 | lockdep_set_class(&call->user_mutex, | |
129 | &rxrpc_call_user_mutex_lock_class_key); | |
130 | ||
e99e88a9 | 131 | timer_setup(&call->timer, rxrpc_call_timer_expired, 0); |
17926a79 | 132 | INIT_WORK(&call->processor, &rxrpc_process_call); |
999b69f8 | 133 | INIT_LIST_HEAD(&call->link); |
45025bce | 134 | INIT_LIST_HEAD(&call->chan_wait_link); |
17926a79 | 135 | INIT_LIST_HEAD(&call->accept_link); |
248f219c DH |
136 | INIT_LIST_HEAD(&call->recvmsg_link); |
137 | INIT_LIST_HEAD(&call->sock_link); | |
45025bce | 138 | init_waitqueue_head(&call->waitq); |
17926a79 | 139 | spin_lock_init(&call->lock); |
20acbd9a | 140 | spin_lock_init(&call->notify_lock); |
c1e15b49 | 141 | spin_lock_init(&call->input_lock); |
17926a79 DH |
142 | rwlock_init(&call->state_lock); |
143 | atomic_set(&call->usage, 1); | |
a25e21f0 | 144 | call->debug_id = debug_id; |
e754eba6 | 145 | call->tx_total_len = -1; |
a158bdd3 DH |
146 | call->next_rx_timo = 20 * HZ; |
147 | call->next_req_timo = 1 * HZ; | |
17926a79 DH |
148 | |
149 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
150 | ||
248f219c | 151 | /* Leave space in the ring to handle a maxed-out jumbo packet */ |
75e42126 | 152 | call->rx_winsize = rxrpc_rx_window_size; |
248f219c DH |
153 | call->tx_winsize = 16; |
154 | call->rx_expect_next = 1; | |
57494343 | 155 | |
f7aec129 | 156 | call->cong_cwnd = 2; |
57494343 | 157 | call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; |
d3be4d24 DH |
158 | |
159 | call->rxnet = rxnet; | |
160 | atomic_inc(&rxnet->nr_calls); | |
17926a79 | 161 | return call; |
248f219c DH |
162 | |
163 | nomem_2: | |
164 | kfree(call->rxtx_buffer); | |
165 | nomem: | |
166 | kmem_cache_free(rxrpc_call_jar, call); | |
167 | return NULL; | |
17926a79 DH |
168 | } |
169 | ||
170 | /* | |
999b69f8 | 171 | * Allocate a new client call. |
17926a79 | 172 | */ |
9faaff59 DH |
173 | static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
174 | struct sockaddr_rxrpc *srx, | |
a25e21f0 DH |
175 | gfp_t gfp, |
176 | unsigned int debug_id) | |
17926a79 DH |
177 | { |
178 | struct rxrpc_call *call; | |
57494343 | 179 | ktime_t now; |
17926a79 DH |
180 | |
181 | _enter(""); | |
182 | ||
a25e21f0 | 183 | call = rxrpc_alloc_call(rx, gfp, debug_id); |
17926a79 DH |
184 | if (!call) |
185 | return ERR_PTR(-ENOMEM); | |
999b69f8 | 186 | call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; |
999b69f8 | 187 | call->service_id = srx->srx_service; |
71f3ca40 | 188 | call->tx_phase = true; |
57494343 DH |
189 | now = ktime_get_real(); |
190 | call->acks_latest_ts = now; | |
191 | call->cong_tstamp = now; | |
999b69f8 DH |
192 | |
193 | _leave(" = %p", call); | |
194 | return call; | |
195 | } | |
196 | ||
197 | /* | |
248f219c | 198 | * Initiate the call ack/resend/expiry timer. |
999b69f8 | 199 | */ |
248f219c | 200 | static void rxrpc_start_call_timer(struct rxrpc_call *call) |
999b69f8 | 201 | { |
a158bdd3 DH |
202 | unsigned long now = jiffies; |
203 | unsigned long j = now + MAX_JIFFY_OFFSET; | |
204 | ||
205 | call->ack_at = j; | |
bd1fdf8c | 206 | call->ack_lost_at = j; |
a158bdd3 DH |
207 | call->resend_at = j; |
208 | call->ping_at = j; | |
209 | call->expect_rx_by = j; | |
210 | call->expect_req_by = j; | |
211 | call->expect_term_by = j; | |
212 | call->timer.expires = now; | |
17926a79 DH |
213 | } |
214 | ||
215 | /* | |
540b1c48 DH |
216 | * Set up a call for the given parameters. |
217 | * - Called with the socket lock held, which it must release. | |
218 | * - If it returns a call, the call's lock will need releasing by the caller. | |
17926a79 | 219 | */ |
2341e077 | 220 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
19ffa01c | 221 | struct rxrpc_conn_parameters *cp, |
999b69f8 | 222 | struct sockaddr_rxrpc *srx, |
48124178 | 223 | struct rxrpc_call_params *p, |
a25e21f0 DH |
224 | gfp_t gfp, |
225 | unsigned int debug_id) | |
540b1c48 | 226 | __releases(&rx->sk.sk_lock.slock) |
88f2a825 | 227 | __acquires(&call->user_mutex) |
17926a79 | 228 | { |
2341e077 | 229 | struct rxrpc_call *call, *xcall; |
d3be4d24 | 230 | struct rxrpc_net *rxnet; |
2341e077 | 231 | struct rb_node *parent, **pp; |
e34d4234 | 232 | const void *here = __builtin_return_address(0); |
999b69f8 | 233 | int ret; |
17926a79 | 234 | |
48124178 | 235 | _enter("%p,%lx", rx, p->user_call_ID); |
17926a79 | 236 | |
a25e21f0 | 237 | call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); |
2341e077 | 238 | if (IS_ERR(call)) { |
540b1c48 | 239 | release_sock(&rx->sk); |
2341e077 DH |
240 | _leave(" = %ld", PTR_ERR(call)); |
241 | return call; | |
17926a79 DH |
242 | } |
243 | ||
48124178 | 244 | call->tx_total_len = p->tx_total_len; |
a84a46d7 | 245 | trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), |
48124178 | 246 | here, (const void *)p->user_call_ID); |
e34d4234 | 247 | |
540b1c48 DH |
248 | /* We need to protect a partially set up call against the user as we |
249 | * will be acting outside the socket lock. | |
250 | */ | |
251 | mutex_lock(&call->user_mutex); | |
252 | ||
999b69f8 | 253 | /* Publish the call, even though it is incompletely set up as yet */ |
17926a79 DH |
254 | write_lock(&rx->call_lock); |
255 | ||
256 | pp = &rx->calls.rb_node; | |
257 | parent = NULL; | |
258 | while (*pp) { | |
259 | parent = *pp; | |
2341e077 | 260 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 261 | |
48124178 | 262 | if (p->user_call_ID < xcall->user_call_ID) |
17926a79 | 263 | pp = &(*pp)->rb_left; |
48124178 | 264 | else if (p->user_call_ID > xcall->user_call_ID) |
17926a79 DH |
265 | pp = &(*pp)->rb_right; |
266 | else | |
357f5ef6 | 267 | goto error_dup_user_ID; |
17926a79 DH |
268 | } |
269 | ||
248f219c | 270 | rcu_assign_pointer(call->socket, rx); |
48124178 | 271 | call->user_call_ID = p->user_call_ID; |
357f5ef6 | 272 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
fff72429 | 273 | rxrpc_get_call(call, rxrpc_call_got_userid); |
17926a79 DH |
274 | rb_link_node(&call->sock_node, parent, pp); |
275 | rb_insert_color(&call->sock_node, &rx->calls); | |
248f219c DH |
276 | list_add(&call->sock_link, &rx->sock_calls); |
277 | ||
17926a79 DH |
278 | write_unlock(&rx->call_lock); |
279 | ||
d3be4d24 | 280 | rxnet = call->rxnet; |
2baec2c3 DH |
281 | write_lock(&rxnet->call_lock); |
282 | list_add_tail(&call->link, &rxnet->calls); | |
283 | write_unlock(&rxnet->call_lock); | |
17926a79 | 284 | |
540b1c48 DH |
285 | /* From this point on, the call is protected by its own lock. */ |
286 | release_sock(&rx->sk); | |
287 | ||
248f219c DH |
288 | /* Set up or get a connection record and set the protocol parameters, |
289 | * including channel number and call ID. | |
290 | */ | |
5e33a23b | 291 | ret = rxrpc_connect_call(rx, call, cp, srx, gfp); |
999b69f8 DH |
292 | if (ret < 0) |
293 | goto error; | |
294 | ||
a84a46d7 | 295 | trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), |
54fde423 | 296 | here, NULL); |
a84a46d7 | 297 | |
248f219c DH |
298 | rxrpc_start_call_timer(call); |
299 | ||
17926a79 DH |
300 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); |
301 | ||
302 | _leave(" = %p [new]", call); | |
303 | return call; | |
304 | ||
2341e077 DH |
305 | /* We unexpectedly found the user ID in the list after taking |
306 | * the call_lock. This shouldn't happen unless the user races | |
307 | * with itself and tries to add the same user ID twice at the | |
308 | * same time in different threads. | |
309 | */ | |
357f5ef6 | 310 | error_dup_user_ID: |
17926a79 | 311 | write_unlock(&rx->call_lock); |
540b1c48 | 312 | release_sock(&rx->sk); |
8d94aa38 | 313 | ret = -EEXIST; |
357f5ef6 DH |
314 | |
315 | error: | |
316 | __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, | |
317 | RX_CALL_DEAD, ret); | |
a84a46d7 DH |
318 | trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), |
319 | here, ERR_PTR(ret)); | |
357f5ef6 | 320 | rxrpc_release_call(rx, call); |
540b1c48 | 321 | mutex_unlock(&call->user_mutex); |
357f5ef6 DH |
322 | rxrpc_put_call(call, rxrpc_call_put); |
323 | _leave(" = %d", ret); | |
324 | return ERR_PTR(ret); | |
17926a79 DH |
325 | } |
326 | ||
c038a58c DH |
327 | /* |
328 | * Retry a call to a new address. It is expected that the Tx queue of the call | |
329 | * will contain data previously packaged for an old call. | |
330 | */ | |
331 | int rxrpc_retry_client_call(struct rxrpc_sock *rx, | |
332 | struct rxrpc_call *call, | |
333 | struct rxrpc_conn_parameters *cp, | |
334 | struct sockaddr_rxrpc *srx, | |
335 | gfp_t gfp) | |
336 | { | |
337 | const void *here = __builtin_return_address(0); | |
338 | int ret; | |
339 | ||
340 | /* Set up or get a connection record and set the protocol parameters, | |
341 | * including channel number and call ID. | |
342 | */ | |
5e33a23b | 343 | ret = rxrpc_connect_call(rx, call, cp, srx, gfp); |
c038a58c DH |
344 | if (ret < 0) |
345 | goto error; | |
346 | ||
347 | trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), | |
348 | here, NULL); | |
349 | ||
350 | rxrpc_start_call_timer(call); | |
351 | ||
352 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); | |
353 | ||
354 | if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) | |
355 | rxrpc_queue_call(call); | |
356 | ||
357 | _leave(" = 0"); | |
358 | return 0; | |
359 | ||
360 | error: | |
361 | rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, | |
362 | RX_CALL_DEAD, ret); | |
363 | trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), | |
364 | here, ERR_PTR(ret)); | |
365 | _leave(" = %d", ret); | |
366 | return ret; | |
367 | } | |
368 | ||
17926a79 | 369 | /* |
248f219c DH |
370 | * Set up an incoming call. call->conn points to the connection. |
371 | * This is called in BH context and isn't allowed to fail. | |
17926a79 | 372 | */ |
248f219c DH |
373 | void rxrpc_incoming_call(struct rxrpc_sock *rx, |
374 | struct rxrpc_call *call, | |
375 | struct sk_buff *skb) | |
17926a79 | 376 | { |
248f219c | 377 | struct rxrpc_connection *conn = call->conn; |
42886ffe | 378 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c | 379 | u32 chan; |
17926a79 | 380 | |
248f219c | 381 | _enter(",%d", call->conn->debug_id); |
e34d4234 | 382 | |
248f219c DH |
383 | rcu_assign_pointer(call->socket, rx); |
384 | call->call_id = sp->hdr.callNumber; | |
385 | call->service_id = sp->hdr.serviceId; | |
386 | call->cid = sp->hdr.cid; | |
387 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
388 | if (sp->hdr.securityIndex > 0) | |
389 | call->state = RXRPC_CALL_SERVER_SECURING; | |
57494343 | 390 | call->cong_tstamp = skb->tstamp; |
248f219c DH |
391 | |
392 | /* Set the channel for this call. We don't get channel_lock as we're | |
393 | * only defending against the data_ready handler (which we're called | |
394 | * from) and the RESPONSE packet parser (which is only really | |
395 | * interested in call_counter and can cope with a disagreement with the | |
396 | * call pointer). | |
a1399f8b | 397 | */ |
248f219c DH |
398 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
399 | conn->channels[chan].call_counter = call->call_id; | |
400 | conn->channels[chan].call_id = call->call_id; | |
a1399f8b | 401 | rcu_assign_pointer(conn->channels[chan].call, call); |
17926a79 | 402 | |
85f32278 | 403 | spin_lock(&conn->params.peer->lock); |
f3344303 | 404 | hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); |
85f32278 | 405 | spin_unlock(&conn->params.peer->lock); |
17926a79 | 406 | |
17926a79 DH |
407 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
408 | ||
248f219c DH |
409 | rxrpc_start_call_timer(call); |
410 | _leave(""); | |
17926a79 DH |
411 | } |
412 | ||
8d94aa38 DH |
413 | /* |
414 | * Queue a call's work processor, getting a ref to pass to the work queue. | |
415 | */ | |
416 | bool rxrpc_queue_call(struct rxrpc_call *call) | |
417 | { | |
418 | const void *here = __builtin_return_address(0); | |
bfc18e38 | 419 | int n = atomic_fetch_add_unless(&call->usage, 1, 0); |
8d94aa38 DH |
420 | if (n == 0) |
421 | return false; | |
422 | if (rxrpc_queue_work(&call->processor)) | |
2ab27215 | 423 | trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); |
8d94aa38 DH |
424 | else |
425 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
426 | return true; | |
427 | } | |
428 | ||
429 | /* | |
430 | * Queue a call's work processor, passing the callers ref to the work queue. | |
431 | */ | |
432 | bool __rxrpc_queue_call(struct rxrpc_call *call) | |
433 | { | |
434 | const void *here = __builtin_return_address(0); | |
435 | int n = atomic_read(&call->usage); | |
8d94aa38 DH |
436 | ASSERTCMP(n, >=, 1); |
437 | if (rxrpc_queue_work(&call->processor)) | |
2ab27215 | 438 | trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); |
8d94aa38 DH |
439 | else |
440 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
441 | return true; | |
442 | } | |
443 | ||
e34d4234 DH |
444 | /* |
445 | * Note the re-emergence of a call. | |
446 | */ | |
447 | void rxrpc_see_call(struct rxrpc_call *call) | |
448 | { | |
449 | const void *here = __builtin_return_address(0); | |
450 | if (call) { | |
451 | int n = atomic_read(&call->usage); | |
e34d4234 | 452 | |
2ab27215 | 453 | trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); |
e34d4234 DH |
454 | } |
455 | } | |
456 | ||
457 | /* | |
458 | * Note the addition of a ref on a call. | |
459 | */ | |
fff72429 | 460 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
e34d4234 DH |
461 | { |
462 | const void *here = __builtin_return_address(0); | |
463 | int n = atomic_inc_return(&call->usage); | |
e34d4234 | 464 | |
2ab27215 | 465 | trace_rxrpc_call(call, op, n, here, NULL); |
e34d4234 DH |
466 | } |
467 | ||
468 | /* | |
248f219c | 469 | * Detach a call from its owning socket. |
e34d4234 | 470 | */ |
248f219c | 471 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
e34d4234 | 472 | { |
a84a46d7 | 473 | const void *here = __builtin_return_address(0); |
248f219c DH |
474 | struct rxrpc_connection *conn = call->conn; |
475 | bool put = false; | |
476 | int i; | |
e34d4234 | 477 | |
248f219c | 478 | _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); |
e34d4234 | 479 | |
a84a46d7 DH |
480 | trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), |
481 | here, (const void *)call->flags); | |
17926a79 | 482 | |
a84a46d7 | 483 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
e34d4234 | 484 | |
17926a79 DH |
485 | spin_lock_bh(&call->lock); |
486 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
487 | BUG(); | |
488 | spin_unlock_bh(&call->lock); | |
489 | ||
248f219c | 490 | del_timer_sync(&call->timer); |
17926a79 | 491 | |
248f219c DH |
492 | /* Make sure we don't get any more notifications */ |
493 | write_lock_bh(&rx->recvmsg_lock); | |
e653cfe4 | 494 | |
248f219c | 495 | if (!list_empty(&call->recvmsg_link)) { |
17926a79 DH |
496 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
497 | call, call->events, call->flags); | |
248f219c DH |
498 | list_del(&call->recvmsg_link); |
499 | put = true; | |
500 | } | |
501 | ||
502 | /* list_empty() must return false in rxrpc_notify_socket() */ | |
503 | call->recvmsg_link.next = NULL; | |
504 | call->recvmsg_link.prev = NULL; | |
505 | ||
506 | write_unlock_bh(&rx->recvmsg_lock); | |
507 | if (put) | |
508 | rxrpc_put_call(call, rxrpc_call_put); | |
509 | ||
510 | write_lock(&rx->call_lock); | |
511 | ||
512 | if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
17926a79 DH |
513 | rb_erase(&call->sock_node, &rx->calls); |
514 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
8d94aa38 | 515 | rxrpc_put_call(call, rxrpc_call_put_userid); |
17926a79 | 516 | } |
17926a79 | 517 | |
248f219c DH |
518 | list_del(&call->sock_link); |
519 | write_unlock(&rx->call_lock); | |
520 | ||
521 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); | |
522 | ||
523 | if (conn) | |
8d94aa38 | 524 | rxrpc_disconnect_call(call); |
e653cfe4 | 525 | |
248f219c | 526 | for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { |
71f3ca40 DH |
527 | rxrpc_free_skb(call->rxtx_buffer[i], |
528 | (call->tx_phase ? rxrpc_skb_tx_cleaned : | |
529 | rxrpc_skb_rx_cleaned)); | |
248f219c | 530 | call->rxtx_buffer[i] = NULL; |
17926a79 | 531 | } |
17926a79 DH |
532 | |
533 | _leave(""); | |
534 | } | |
535 | ||
c038a58c DH |
536 | /* |
537 | * Prepare a kernel service call for retry. | |
538 | */ | |
539 | int rxrpc_prepare_call_for_retry(struct rxrpc_sock *rx, struct rxrpc_call *call) | |
540 | { | |
541 | const void *here = __builtin_return_address(0); | |
542 | int i; | |
543 | u8 last = 0; | |
544 | ||
545 | _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); | |
546 | ||
547 | trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), | |
548 | here, (const void *)call->flags); | |
549 | ||
550 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); | |
551 | ASSERTCMP(call->completion, !=, RXRPC_CALL_REMOTELY_ABORTED); | |
552 | ASSERTCMP(call->completion, !=, RXRPC_CALL_LOCALLY_ABORTED); | |
553 | ASSERT(list_empty(&call->recvmsg_link)); | |
554 | ||
555 | del_timer_sync(&call->timer); | |
556 | ||
557 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, call->conn); | |
558 | ||
559 | if (call->conn) | |
560 | rxrpc_disconnect_call(call); | |
561 | ||
562 | if (rxrpc_is_service_call(call) || | |
563 | !call->tx_phase || | |
564 | call->tx_hard_ack != 0 || | |
565 | call->rx_hard_ack != 0 || | |
566 | call->rx_top != 0) | |
567 | return -EINVAL; | |
568 | ||
569 | call->state = RXRPC_CALL_UNINITIALISED; | |
570 | call->completion = RXRPC_CALL_SUCCEEDED; | |
571 | call->call_id = 0; | |
572 | call->cid = 0; | |
573 | call->cong_cwnd = 0; | |
574 | call->cong_extra = 0; | |
575 | call->cong_ssthresh = 0; | |
576 | call->cong_mode = 0; | |
577 | call->cong_dup_acks = 0; | |
578 | call->cong_cumul_acks = 0; | |
579 | call->acks_lowest_nak = 0; | |
580 | ||
581 | for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { | |
582 | last |= call->rxtx_annotations[i]; | |
583 | call->rxtx_annotations[i] &= RXRPC_TX_ANNO_LAST; | |
584 | call->rxtx_annotations[i] |= RXRPC_TX_ANNO_RETRANS; | |
585 | } | |
586 | ||
587 | _leave(" = 0"); | |
588 | return 0; | |
589 | } | |
590 | ||
17926a79 DH |
591 | /* |
592 | * release all the calls associated with a socket | |
593 | */ | |
594 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
595 | { | |
596 | struct rxrpc_call *call; | |
17926a79 DH |
597 | |
598 | _enter("%p", rx); | |
599 | ||
0360da6d DH |
600 | while (!list_empty(&rx->to_be_accepted)) { |
601 | call = list_entry(rx->to_be_accepted.next, | |
602 | struct rxrpc_call, accept_link); | |
603 | list_del(&call->accept_link); | |
3a92789a | 604 | rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); |
0360da6d DH |
605 | rxrpc_put_call(call, rxrpc_call_put); |
606 | } | |
607 | ||
248f219c DH |
608 | while (!list_empty(&rx->sock_calls)) { |
609 | call = list_entry(rx->sock_calls.next, | |
610 | struct rxrpc_call, sock_link); | |
611 | rxrpc_get_call(call, rxrpc_call_got); | |
3a92789a | 612 | rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); |
26cb02aa | 613 | rxrpc_send_abort_packet(call); |
8d94aa38 | 614 | rxrpc_release_call(rx, call); |
248f219c | 615 | rxrpc_put_call(call, rxrpc_call_put); |
f36b5e44 DH |
616 | } |
617 | ||
17926a79 DH |
618 | _leave(""); |
619 | } | |
620 | ||
621 | /* | |
622 | * release a call | |
623 | */ | |
fff72429 | 624 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
17926a79 | 625 | { |
d3be4d24 | 626 | struct rxrpc_net *rxnet = call->rxnet; |
e34d4234 | 627 | const void *here = __builtin_return_address(0); |
2ab27215 | 628 | int n; |
17926a79 | 629 | |
e34d4234 | 630 | ASSERT(call != NULL); |
17926a79 | 631 | |
e34d4234 | 632 | n = atomic_dec_return(&call->usage); |
2ab27215 | 633 | trace_rxrpc_call(call, op, n, here, NULL); |
e34d4234 DH |
634 | ASSERTCMP(n, >=, 0); |
635 | if (n == 0) { | |
636 | _debug("call %d dead", call->debug_id); | |
248f219c | 637 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 638 | |
2baec2c3 | 639 | if (!list_empty(&call->link)) { |
2baec2c3 DH |
640 | write_lock(&rxnet->call_lock); |
641 | list_del_init(&call->link); | |
642 | write_unlock(&rxnet->call_lock); | |
643 | } | |
e34d4234 | 644 | |
8d94aa38 | 645 | rxrpc_cleanup_call(call); |
17926a79 | 646 | } |
17926a79 DH |
647 | } |
648 | ||
dee46364 DH |
649 | /* |
650 | * Final call destruction under RCU. | |
651 | */ | |
652 | static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) | |
653 | { | |
654 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); | |
d3be4d24 | 655 | struct rxrpc_net *rxnet = call->rxnet; |
dee46364 | 656 | |
df5d8bf7 | 657 | rxrpc_put_peer(call->peer); |
248f219c DH |
658 | kfree(call->rxtx_buffer); |
659 | kfree(call->rxtx_annotations); | |
dee46364 | 660 | kmem_cache_free(rxrpc_call_jar, call); |
d3be4d24 | 661 | if (atomic_dec_and_test(&rxnet->nr_calls)) |
5bb053be | 662 | wake_up_var(&rxnet->nr_calls); |
dee46364 DH |
663 | } |
664 | ||
17926a79 DH |
665 | /* |
666 | * clean up a call | |
667 | */ | |
00e90712 | 668 | void rxrpc_cleanup_call(struct rxrpc_call *call) |
17926a79 | 669 | { |
248f219c | 670 | int i; |
17926a79 | 671 | |
248f219c | 672 | _net("DESTROY CALL %d", call->debug_id); |
17926a79 DH |
673 | |
674 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); | |
675 | ||
248f219c | 676 | del_timer_sync(&call->timer); |
17926a79 | 677 | |
8d94aa38 | 678 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 679 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
e653cfe4 | 680 | ASSERTCMP(call->conn, ==, NULL); |
17926a79 | 681 | |
248f219c DH |
682 | /* Clean up the Rx/Tx buffer */ |
683 | for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) | |
71f3ca40 DH |
684 | rxrpc_free_skb(call->rxtx_buffer[i], |
685 | (call->tx_phase ? rxrpc_skb_tx_cleaned : | |
686 | rxrpc_skb_rx_cleaned)); | |
17926a79 | 687 | |
71f3ca40 | 688 | rxrpc_free_skb(call->tx_pending, rxrpc_skb_tx_cleaned); |
17926a79 | 689 | |
dee46364 | 690 | call_rcu(&call->rcu, rxrpc_rcu_destroy_call); |
17926a79 DH |
691 | } |
692 | ||
693 | /* | |
2baec2c3 DH |
694 | * Make sure that all calls are gone from a network namespace. To reach this |
695 | * point, any open UDP sockets in that namespace must have been closed, so any | |
696 | * outstanding calls cannot be doing I/O. | |
17926a79 | 697 | */ |
2baec2c3 | 698 | void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) |
17926a79 DH |
699 | { |
700 | struct rxrpc_call *call; | |
701 | ||
702 | _enter(""); | |
8d94aa38 | 703 | |
2baec2c3 | 704 | if (list_empty(&rxnet->calls)) |
8d94aa38 | 705 | return; |
248f219c | 706 | |
2baec2c3 | 707 | write_lock(&rxnet->call_lock); |
17926a79 | 708 | |
2baec2c3 DH |
709 | while (!list_empty(&rxnet->calls)) { |
710 | call = list_entry(rxnet->calls.next, struct rxrpc_call, link); | |
17926a79 DH |
711 | _debug("Zapping call %p", call); |
712 | ||
e34d4234 | 713 | rxrpc_see_call(call); |
17926a79 DH |
714 | list_del_init(&call->link); |
715 | ||
248f219c | 716 | pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", |
8d94aa38 | 717 | call, atomic_read(&call->usage), |
8d94aa38 DH |
718 | rxrpc_call_states[call->state], |
719 | call->flags, call->events); | |
17926a79 | 720 | |
2baec2c3 | 721 | write_unlock(&rxnet->call_lock); |
17926a79 | 722 | cond_resched(); |
2baec2c3 | 723 | write_lock(&rxnet->call_lock); |
17926a79 DH |
724 | } |
725 | ||
2baec2c3 | 726 | write_unlock(&rxnet->call_lock); |
d3be4d24 DH |
727 | |
728 | atomic_dec(&rxnet->nr_calls); | |
5bb053be | 729 | wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); |
17926a79 | 730 | } |