Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
17926a79 DH |
2 | /* RxRPC individual remote procedure call handling |
3 | * | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
17926a79 DH |
6 | */ |
7 | ||
9b6d5398 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
5a0e3ad6 | 10 | #include <linux/slab.h> |
17926a79 DH |
11 | #include <linux/module.h> |
12 | #include <linux/circ_buf.h> | |
7727640c | 13 | #include <linux/spinlock_types.h> |
17926a79 DH |
14 | #include <net/sock.h> |
15 | #include <net/af_rxrpc.h> | |
16 | #include "ar-internal.h" | |
17 | ||
5b8848d1 | 18 | const char *const rxrpc_call_states[NR__RXRPC_CALL_STATES] = { |
f5c17aae | 19 | [RXRPC_CALL_UNINITIALISED] = "Uninit ", |
999b69f8 | 20 | [RXRPC_CALL_CLIENT_AWAIT_CONN] = "ClWtConn", |
1f8481d1 DH |
21 | [RXRPC_CALL_CLIENT_SEND_REQUEST] = "ClSndReq", |
22 | [RXRPC_CALL_CLIENT_AWAIT_REPLY] = "ClAwtRpl", | |
23 | [RXRPC_CALL_CLIENT_RECV_REPLY] = "ClRcvRpl", | |
00e90712 | 24 | [RXRPC_CALL_SERVER_PREALLOC] = "SvPrealc", |
1f8481d1 DH |
25 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", |
26 | [RXRPC_CALL_SERVER_ACCEPTING] = "SvAccept", | |
27 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", | |
28 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", | |
29 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", | |
30 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", | |
31 | [RXRPC_CALL_COMPLETE] = "Complete", | |
f5c17aae DH |
32 | }; |
33 | ||
34 | const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { | |
35 | [RXRPC_CALL_SUCCEEDED] = "Complete", | |
1f8481d1 DH |
36 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", |
37 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
f5c17aae | 38 | [RXRPC_CALL_LOCAL_ERROR] = "LocError", |
1f8481d1 | 39 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", |
1f8481d1 DH |
40 | }; |
41 | ||
17926a79 | 42 | struct kmem_cache *rxrpc_call_jar; |
17926a79 | 43 | |
e99e88a9 | 44 | static void rxrpc_call_timer_expired(struct timer_list *t) |
248f219c | 45 | { |
e99e88a9 | 46 | struct rxrpc_call *call = from_timer(call, t, timer); |
248f219c DH |
47 | |
48 | _enter("%d", call->debug_id); | |
49 | ||
a158bdd3 DH |
50 | if (call->state < RXRPC_CALL_COMPLETE) { |
51 | trace_rxrpc_timer(call, rxrpc_timer_expired, jiffies); | |
52 | rxrpc_queue_call(call); | |
53 | } | |
248f219c | 54 | } |
17926a79 | 55 | |
9faaff59 DH |
56 | static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; |
57 | ||
2341e077 DH |
58 | /* |
59 | * find an extant server call | |
60 | * - called in process context with IRQs enabled | |
61 | */ | |
62 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, | |
63 | unsigned long user_call_ID) | |
64 | { | |
65 | struct rxrpc_call *call; | |
66 | struct rb_node *p; | |
67 | ||
68 | _enter("%p,%lx", rx, user_call_ID); | |
69 | ||
70 | read_lock(&rx->call_lock); | |
71 | ||
72 | p = rx->calls.rb_node; | |
73 | while (p) { | |
74 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
75 | ||
76 | if (user_call_ID < call->user_call_ID) | |
77 | p = p->rb_left; | |
78 | else if (user_call_ID > call->user_call_ID) | |
79 | p = p->rb_right; | |
80 | else | |
81 | goto found_extant_call; | |
82 | } | |
83 | ||
84 | read_unlock(&rx->call_lock); | |
85 | _leave(" = NULL"); | |
86 | return NULL; | |
87 | ||
88 | found_extant_call: | |
fff72429 | 89 | rxrpc_get_call(call, rxrpc_call_got); |
2341e077 DH |
90 | read_unlock(&rx->call_lock); |
91 | _leave(" = %p [%d]", call, atomic_read(&call->usage)); | |
92 | return call; | |
93 | } | |
94 | ||
17926a79 DH |
95 | /* |
96 | * allocate a new call | |
97 | */ | |
a25e21f0 DH |
98 | struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, |
99 | unsigned int debug_id) | |
17926a79 DH |
100 | { |
101 | struct rxrpc_call *call; | |
d3be4d24 | 102 | struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); |
17926a79 DH |
103 | |
104 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
105 | if (!call) | |
106 | return NULL; | |
107 | ||
248f219c DH |
108 | call->rxtx_buffer = kcalloc(RXRPC_RXTX_BUFF_SIZE, |
109 | sizeof(struct sk_buff *), | |
17926a79 | 110 | gfp); |
248f219c DH |
111 | if (!call->rxtx_buffer) |
112 | goto nomem; | |
17926a79 | 113 | |
248f219c DH |
114 | call->rxtx_annotations = kcalloc(RXRPC_RXTX_BUFF_SIZE, sizeof(u8), gfp); |
115 | if (!call->rxtx_annotations) | |
116 | goto nomem_2; | |
117 | ||
540b1c48 | 118 | mutex_init(&call->user_mutex); |
9faaff59 DH |
119 | |
120 | /* Prevent lockdep reporting a deadlock false positive between the afs | |
121 | * filesystem and sys_sendmsg() via the mmap sem. | |
122 | */ | |
123 | if (rx->sk.sk_kern_sock) | |
124 | lockdep_set_class(&call->user_mutex, | |
125 | &rxrpc_call_user_mutex_lock_class_key); | |
126 | ||
e99e88a9 | 127 | timer_setup(&call->timer, rxrpc_call_timer_expired, 0); |
17926a79 | 128 | INIT_WORK(&call->processor, &rxrpc_process_call); |
999b69f8 | 129 | INIT_LIST_HEAD(&call->link); |
45025bce | 130 | INIT_LIST_HEAD(&call->chan_wait_link); |
17926a79 | 131 | INIT_LIST_HEAD(&call->accept_link); |
248f219c DH |
132 | INIT_LIST_HEAD(&call->recvmsg_link); |
133 | INIT_LIST_HEAD(&call->sock_link); | |
45025bce | 134 | init_waitqueue_head(&call->waitq); |
17926a79 | 135 | spin_lock_init(&call->lock); |
20acbd9a | 136 | spin_lock_init(&call->notify_lock); |
c1e15b49 | 137 | spin_lock_init(&call->input_lock); |
17926a79 DH |
138 | rwlock_init(&call->state_lock); |
139 | atomic_set(&call->usage, 1); | |
a25e21f0 | 140 | call->debug_id = debug_id; |
e754eba6 | 141 | call->tx_total_len = -1; |
a158bdd3 DH |
142 | call->next_rx_timo = 20 * HZ; |
143 | call->next_req_timo = 1 * HZ; | |
17926a79 DH |
144 | |
145 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
146 | ||
248f219c | 147 | /* Leave space in the ring to handle a maxed-out jumbo packet */ |
75e42126 | 148 | call->rx_winsize = rxrpc_rx_window_size; |
248f219c DH |
149 | call->tx_winsize = 16; |
150 | call->rx_expect_next = 1; | |
57494343 | 151 | |
f7aec129 | 152 | call->cong_cwnd = 2; |
57494343 | 153 | call->cong_ssthresh = RXRPC_RXTX_BUFF_SIZE - 1; |
d3be4d24 DH |
154 | |
155 | call->rxnet = rxnet; | |
156 | atomic_inc(&rxnet->nr_calls); | |
17926a79 | 157 | return call; |
248f219c DH |
158 | |
159 | nomem_2: | |
160 | kfree(call->rxtx_buffer); | |
161 | nomem: | |
162 | kmem_cache_free(rxrpc_call_jar, call); | |
163 | return NULL; | |
17926a79 DH |
164 | } |
165 | ||
166 | /* | |
999b69f8 | 167 | * Allocate a new client call. |
17926a79 | 168 | */ |
9faaff59 DH |
169 | static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
170 | struct sockaddr_rxrpc *srx, | |
a25e21f0 DH |
171 | gfp_t gfp, |
172 | unsigned int debug_id) | |
17926a79 DH |
173 | { |
174 | struct rxrpc_call *call; | |
57494343 | 175 | ktime_t now; |
17926a79 DH |
176 | |
177 | _enter(""); | |
178 | ||
a25e21f0 | 179 | call = rxrpc_alloc_call(rx, gfp, debug_id); |
17926a79 DH |
180 | if (!call) |
181 | return ERR_PTR(-ENOMEM); | |
999b69f8 | 182 | call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; |
999b69f8 | 183 | call->service_id = srx->srx_service; |
71f3ca40 | 184 | call->tx_phase = true; |
57494343 DH |
185 | now = ktime_get_real(); |
186 | call->acks_latest_ts = now; | |
187 | call->cong_tstamp = now; | |
999b69f8 DH |
188 | |
189 | _leave(" = %p", call); | |
190 | return call; | |
191 | } | |
192 | ||
193 | /* | |
248f219c | 194 | * Initiate the call ack/resend/expiry timer. |
999b69f8 | 195 | */ |
248f219c | 196 | static void rxrpc_start_call_timer(struct rxrpc_call *call) |
999b69f8 | 197 | { |
a158bdd3 DH |
198 | unsigned long now = jiffies; |
199 | unsigned long j = now + MAX_JIFFY_OFFSET; | |
200 | ||
201 | call->ack_at = j; | |
bd1fdf8c | 202 | call->ack_lost_at = j; |
a158bdd3 DH |
203 | call->resend_at = j; |
204 | call->ping_at = j; | |
205 | call->expect_rx_by = j; | |
206 | call->expect_req_by = j; | |
207 | call->expect_term_by = j; | |
208 | call->timer.expires = now; | |
17926a79 DH |
209 | } |
210 | ||
211 | /* | |
540b1c48 DH |
212 | * Set up a call for the given parameters. |
213 | * - Called with the socket lock held, which it must release. | |
214 | * - If it returns a call, the call's lock will need releasing by the caller. | |
17926a79 | 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, |
48124178 | 219 | struct rxrpc_call_params *p, |
a25e21f0 DH |
220 | gfp_t gfp, |
221 | unsigned int debug_id) | |
540b1c48 | 222 | __releases(&rx->sk.sk_lock.slock) |
88f2a825 | 223 | __acquires(&call->user_mutex) |
17926a79 | 224 | { |
2341e077 | 225 | struct rxrpc_call *call, *xcall; |
d3be4d24 | 226 | struct rxrpc_net *rxnet; |
2341e077 | 227 | struct rb_node *parent, **pp; |
e34d4234 | 228 | const void *here = __builtin_return_address(0); |
999b69f8 | 229 | int ret; |
17926a79 | 230 | |
48124178 | 231 | _enter("%p,%lx", rx, p->user_call_ID); |
17926a79 | 232 | |
a25e21f0 | 233 | call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); |
2341e077 | 234 | if (IS_ERR(call)) { |
540b1c48 | 235 | release_sock(&rx->sk); |
2341e077 DH |
236 | _leave(" = %ld", PTR_ERR(call)); |
237 | return call; | |
17926a79 DH |
238 | } |
239 | ||
b960a34b DH |
240 | if (p->intr) |
241 | __set_bit(RXRPC_CALL_IS_INTR, &call->flags); | |
48124178 | 242 | call->tx_total_len = p->tx_total_len; |
a84a46d7 | 243 | trace_rxrpc_call(call, rxrpc_call_new_client, atomic_read(&call->usage), |
48124178 | 244 | here, (const void *)p->user_call_ID); |
e34d4234 | 245 | |
540b1c48 DH |
246 | /* We need to protect a partially set up call against the user as we |
247 | * will be acting outside the socket lock. | |
248 | */ | |
249 | mutex_lock(&call->user_mutex); | |
250 | ||
999b69f8 | 251 | /* Publish the call, even though it is incompletely set up as yet */ |
17926a79 DH |
252 | write_lock(&rx->call_lock); |
253 | ||
254 | pp = &rx->calls.rb_node; | |
255 | parent = NULL; | |
256 | while (*pp) { | |
257 | parent = *pp; | |
2341e077 | 258 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 259 | |
48124178 | 260 | if (p->user_call_ID < xcall->user_call_ID) |
17926a79 | 261 | pp = &(*pp)->rb_left; |
48124178 | 262 | else if (p->user_call_ID > xcall->user_call_ID) |
17926a79 DH |
263 | pp = &(*pp)->rb_right; |
264 | else | |
357f5ef6 | 265 | goto error_dup_user_ID; |
17926a79 DH |
266 | } |
267 | ||
248f219c | 268 | rcu_assign_pointer(call->socket, rx); |
48124178 | 269 | call->user_call_ID = p->user_call_ID; |
357f5ef6 | 270 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
fff72429 | 271 | rxrpc_get_call(call, rxrpc_call_got_userid); |
17926a79 DH |
272 | rb_link_node(&call->sock_node, parent, pp); |
273 | rb_insert_color(&call->sock_node, &rx->calls); | |
248f219c DH |
274 | list_add(&call->sock_link, &rx->sock_calls); |
275 | ||
17926a79 DH |
276 | write_unlock(&rx->call_lock); |
277 | ||
d3be4d24 | 278 | rxnet = call->rxnet; |
2baec2c3 DH |
279 | write_lock(&rxnet->call_lock); |
280 | list_add_tail(&call->link, &rxnet->calls); | |
281 | write_unlock(&rxnet->call_lock); | |
17926a79 | 282 | |
540b1c48 DH |
283 | /* From this point on, the call is protected by its own lock. */ |
284 | release_sock(&rx->sk); | |
285 | ||
248f219c DH |
286 | /* Set up or get a connection record and set the protocol parameters, |
287 | * including channel number and call ID. | |
288 | */ | |
5e33a23b | 289 | ret = rxrpc_connect_call(rx, call, cp, srx, gfp); |
999b69f8 DH |
290 | if (ret < 0) |
291 | goto error; | |
292 | ||
a84a46d7 | 293 | trace_rxrpc_call(call, rxrpc_call_connected, atomic_read(&call->usage), |
54fde423 | 294 | here, NULL); |
a84a46d7 | 295 | |
248f219c DH |
296 | rxrpc_start_call_timer(call); |
297 | ||
17926a79 DH |
298 | _net("CALL new %d on CONN %d", call->debug_id, call->conn->debug_id); |
299 | ||
300 | _leave(" = %p [new]", call); | |
301 | return call; | |
302 | ||
2341e077 DH |
303 | /* We unexpectedly found the user ID in the list after taking |
304 | * the call_lock. This shouldn't happen unless the user races | |
305 | * with itself and tries to add the same user ID twice at the | |
306 | * same time in different threads. | |
307 | */ | |
357f5ef6 | 308 | error_dup_user_ID: |
17926a79 | 309 | write_unlock(&rx->call_lock); |
540b1c48 | 310 | release_sock(&rx->sk); |
8d94aa38 | 311 | ret = -EEXIST; |
357f5ef6 DH |
312 | |
313 | error: | |
314 | __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, | |
315 | RX_CALL_DEAD, ret); | |
a84a46d7 DH |
316 | trace_rxrpc_call(call, rxrpc_call_error, atomic_read(&call->usage), |
317 | here, ERR_PTR(ret)); | |
357f5ef6 | 318 | rxrpc_release_call(rx, call); |
540b1c48 | 319 | mutex_unlock(&call->user_mutex); |
357f5ef6 DH |
320 | rxrpc_put_call(call, rxrpc_call_put); |
321 | _leave(" = %d", ret); | |
322 | return ERR_PTR(ret); | |
17926a79 DH |
323 | } |
324 | ||
325 | /* | |
248f219c DH |
326 | * Set up an incoming call. call->conn points to the connection. |
327 | * This is called in BH context and isn't allowed to fail. | |
17926a79 | 328 | */ |
248f219c DH |
329 | void rxrpc_incoming_call(struct rxrpc_sock *rx, |
330 | struct rxrpc_call *call, | |
331 | struct sk_buff *skb) | |
17926a79 | 332 | { |
248f219c | 333 | struct rxrpc_connection *conn = call->conn; |
42886ffe | 334 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c | 335 | u32 chan; |
17926a79 | 336 | |
248f219c | 337 | _enter(",%d", call->conn->debug_id); |
e34d4234 | 338 | |
248f219c DH |
339 | rcu_assign_pointer(call->socket, rx); |
340 | call->call_id = sp->hdr.callNumber; | |
341 | call->service_id = sp->hdr.serviceId; | |
342 | call->cid = sp->hdr.cid; | |
343 | call->state = RXRPC_CALL_SERVER_ACCEPTING; | |
344 | if (sp->hdr.securityIndex > 0) | |
345 | call->state = RXRPC_CALL_SERVER_SECURING; | |
57494343 | 346 | call->cong_tstamp = skb->tstamp; |
248f219c DH |
347 | |
348 | /* Set the channel for this call. We don't get channel_lock as we're | |
349 | * only defending against the data_ready handler (which we're called | |
350 | * from) and the RESPONSE packet parser (which is only really | |
351 | * interested in call_counter and can cope with a disagreement with the | |
352 | * call pointer). | |
a1399f8b | 353 | */ |
248f219c DH |
354 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
355 | conn->channels[chan].call_counter = call->call_id; | |
356 | conn->channels[chan].call_id = call->call_id; | |
a1399f8b | 357 | rcu_assign_pointer(conn->channels[chan].call, call); |
17926a79 | 358 | |
85f32278 | 359 | spin_lock(&conn->params.peer->lock); |
f3344303 | 360 | hlist_add_head_rcu(&call->error_link, &conn->params.peer->error_targets); |
85f32278 | 361 | spin_unlock(&conn->params.peer->lock); |
17926a79 | 362 | |
17926a79 DH |
363 | _net("CALL incoming %d on CONN %d", call->debug_id, call->conn->debug_id); |
364 | ||
248f219c DH |
365 | rxrpc_start_call_timer(call); |
366 | _leave(""); | |
17926a79 DH |
367 | } |
368 | ||
8d94aa38 DH |
369 | /* |
370 | * Queue a call's work processor, getting a ref to pass to the work queue. | |
371 | */ | |
372 | bool rxrpc_queue_call(struct rxrpc_call *call) | |
373 | { | |
374 | const void *here = __builtin_return_address(0); | |
bfc18e38 | 375 | int n = atomic_fetch_add_unless(&call->usage, 1, 0); |
8d94aa38 DH |
376 | if (n == 0) |
377 | return false; | |
378 | if (rxrpc_queue_work(&call->processor)) | |
2ab27215 | 379 | trace_rxrpc_call(call, rxrpc_call_queued, n + 1, here, NULL); |
8d94aa38 DH |
380 | else |
381 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
382 | return true; | |
383 | } | |
384 | ||
385 | /* | |
386 | * Queue a call's work processor, passing the callers ref to the work queue. | |
387 | */ | |
388 | bool __rxrpc_queue_call(struct rxrpc_call *call) | |
389 | { | |
390 | const void *here = __builtin_return_address(0); | |
391 | int n = atomic_read(&call->usage); | |
8d94aa38 DH |
392 | ASSERTCMP(n, >=, 1); |
393 | if (rxrpc_queue_work(&call->processor)) | |
2ab27215 | 394 | trace_rxrpc_call(call, rxrpc_call_queued_ref, n, here, NULL); |
8d94aa38 DH |
395 | else |
396 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
397 | return true; | |
398 | } | |
399 | ||
e34d4234 DH |
400 | /* |
401 | * Note the re-emergence of a call. | |
402 | */ | |
403 | void rxrpc_see_call(struct rxrpc_call *call) | |
404 | { | |
405 | const void *here = __builtin_return_address(0); | |
406 | if (call) { | |
407 | int n = atomic_read(&call->usage); | |
e34d4234 | 408 | |
2ab27215 | 409 | trace_rxrpc_call(call, rxrpc_call_seen, n, here, NULL); |
e34d4234 DH |
410 | } |
411 | } | |
412 | ||
413 | /* | |
414 | * Note the addition of a ref on a call. | |
415 | */ | |
fff72429 | 416 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
e34d4234 DH |
417 | { |
418 | const void *here = __builtin_return_address(0); | |
419 | int n = atomic_inc_return(&call->usage); | |
e34d4234 | 420 | |
2ab27215 | 421 | trace_rxrpc_call(call, op, n, here, NULL); |
e34d4234 DH |
422 | } |
423 | ||
a641fd00 DH |
424 | /* |
425 | * Clean up the RxTx skb ring. | |
426 | */ | |
427 | static void rxrpc_cleanup_ring(struct rxrpc_call *call) | |
428 | { | |
429 | int i; | |
430 | ||
431 | for (i = 0; i < RXRPC_RXTX_BUFF_SIZE; i++) { | |
987db9f7 | 432 | rxrpc_free_skb(call->rxtx_buffer[i], rxrpc_skb_cleaned); |
a641fd00 DH |
433 | call->rxtx_buffer[i] = NULL; |
434 | } | |
435 | } | |
436 | ||
e34d4234 | 437 | /* |
248f219c | 438 | * Detach a call from its owning socket. |
e34d4234 | 439 | */ |
248f219c | 440 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
e34d4234 | 441 | { |
a84a46d7 | 442 | const void *here = __builtin_return_address(0); |
248f219c DH |
443 | struct rxrpc_connection *conn = call->conn; |
444 | bool put = false; | |
e34d4234 | 445 | |
248f219c | 446 | _enter("{%d,%d}", call->debug_id, atomic_read(&call->usage)); |
e34d4234 | 447 | |
a84a46d7 DH |
448 | trace_rxrpc_call(call, rxrpc_call_release, atomic_read(&call->usage), |
449 | here, (const void *)call->flags); | |
17926a79 | 450 | |
a84a46d7 | 451 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
e34d4234 | 452 | |
17926a79 DH |
453 | spin_lock_bh(&call->lock); |
454 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) | |
455 | BUG(); | |
456 | spin_unlock_bh(&call->lock); | |
457 | ||
248f219c | 458 | del_timer_sync(&call->timer); |
17926a79 | 459 | |
248f219c DH |
460 | /* Make sure we don't get any more notifications */ |
461 | write_lock_bh(&rx->recvmsg_lock); | |
e653cfe4 | 462 | |
248f219c | 463 | if (!list_empty(&call->recvmsg_link)) { |
17926a79 DH |
464 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
465 | call, call->events, call->flags); | |
248f219c DH |
466 | list_del(&call->recvmsg_link); |
467 | put = true; | |
468 | } | |
469 | ||
470 | /* list_empty() must return false in rxrpc_notify_socket() */ | |
471 | call->recvmsg_link.next = NULL; | |
472 | call->recvmsg_link.prev = NULL; | |
473 | ||
474 | write_unlock_bh(&rx->recvmsg_lock); | |
475 | if (put) | |
476 | rxrpc_put_call(call, rxrpc_call_put); | |
477 | ||
478 | write_lock(&rx->call_lock); | |
479 | ||
480 | if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
17926a79 DH |
481 | rb_erase(&call->sock_node, &rx->calls); |
482 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
8d94aa38 | 483 | rxrpc_put_call(call, rxrpc_call_put_userid); |
17926a79 | 484 | } |
17926a79 | 485 | |
248f219c DH |
486 | list_del(&call->sock_link); |
487 | write_unlock(&rx->call_lock); | |
488 | ||
489 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); | |
490 | ||
1db88c53 | 491 | if (conn) { |
8d94aa38 | 492 | rxrpc_disconnect_call(call); |
1db88c53 DH |
493 | conn->security->free_call_crypto(call); |
494 | } | |
e653cfe4 | 495 | |
a641fd00 | 496 | rxrpc_cleanup_ring(call); |
17926a79 DH |
497 | _leave(""); |
498 | } | |
499 | ||
17926a79 DH |
500 | /* |
501 | * release all the calls associated with a socket | |
502 | */ | |
503 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
504 | { | |
505 | struct rxrpc_call *call; | |
17926a79 DH |
506 | |
507 | _enter("%p", rx); | |
508 | ||
0360da6d DH |
509 | while (!list_empty(&rx->to_be_accepted)) { |
510 | call = list_entry(rx->to_be_accepted.next, | |
511 | struct rxrpc_call, accept_link); | |
512 | list_del(&call->accept_link); | |
3a92789a | 513 | rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); |
0360da6d DH |
514 | rxrpc_put_call(call, rxrpc_call_put); |
515 | } | |
516 | ||
248f219c DH |
517 | while (!list_empty(&rx->sock_calls)) { |
518 | call = list_entry(rx->sock_calls.next, | |
519 | struct rxrpc_call, sock_link); | |
520 | rxrpc_get_call(call, rxrpc_call_got); | |
3a92789a | 521 | rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); |
26cb02aa | 522 | rxrpc_send_abort_packet(call); |
8d94aa38 | 523 | rxrpc_release_call(rx, call); |
248f219c | 524 | rxrpc_put_call(call, rxrpc_call_put); |
f36b5e44 DH |
525 | } |
526 | ||
17926a79 DH |
527 | _leave(""); |
528 | } | |
529 | ||
530 | /* | |
531 | * release a call | |
532 | */ | |
fff72429 | 533 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
17926a79 | 534 | { |
d3be4d24 | 535 | struct rxrpc_net *rxnet = call->rxnet; |
e34d4234 | 536 | const void *here = __builtin_return_address(0); |
2ab27215 | 537 | int n; |
17926a79 | 538 | |
e34d4234 | 539 | ASSERT(call != NULL); |
17926a79 | 540 | |
e34d4234 | 541 | n = atomic_dec_return(&call->usage); |
2ab27215 | 542 | trace_rxrpc_call(call, op, n, here, NULL); |
e34d4234 DH |
543 | ASSERTCMP(n, >=, 0); |
544 | if (n == 0) { | |
545 | _debug("call %d dead", call->debug_id); | |
248f219c | 546 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 547 | |
2baec2c3 | 548 | if (!list_empty(&call->link)) { |
2baec2c3 DH |
549 | write_lock(&rxnet->call_lock); |
550 | list_del_init(&call->link); | |
551 | write_unlock(&rxnet->call_lock); | |
552 | } | |
e34d4234 | 553 | |
8d94aa38 | 554 | rxrpc_cleanup_call(call); |
17926a79 | 555 | } |
17926a79 DH |
556 | } |
557 | ||
dee46364 DH |
558 | /* |
559 | * Final call destruction under RCU. | |
560 | */ | |
561 | static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) | |
562 | { | |
563 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); | |
d3be4d24 | 564 | struct rxrpc_net *rxnet = call->rxnet; |
dee46364 | 565 | |
df5d8bf7 | 566 | rxrpc_put_peer(call->peer); |
248f219c DH |
567 | kfree(call->rxtx_buffer); |
568 | kfree(call->rxtx_annotations); | |
dee46364 | 569 | kmem_cache_free(rxrpc_call_jar, call); |
d3be4d24 | 570 | if (atomic_dec_and_test(&rxnet->nr_calls)) |
5bb053be | 571 | wake_up_var(&rxnet->nr_calls); |
dee46364 DH |
572 | } |
573 | ||
17926a79 DH |
574 | /* |
575 | * clean up a call | |
576 | */ | |
00e90712 | 577 | void rxrpc_cleanup_call(struct rxrpc_call *call) |
17926a79 | 578 | { |
248f219c | 579 | _net("DESTROY CALL %d", call->debug_id); |
17926a79 DH |
580 | |
581 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); | |
582 | ||
248f219c | 583 | del_timer_sync(&call->timer); |
17926a79 | 584 | |
8d94aa38 | 585 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 586 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
e653cfe4 | 587 | ASSERTCMP(call->conn, ==, NULL); |
17926a79 | 588 | |
a641fd00 | 589 | rxrpc_cleanup_ring(call); |
987db9f7 | 590 | rxrpc_free_skb(call->tx_pending, rxrpc_skb_cleaned); |
17926a79 | 591 | |
dee46364 | 592 | call_rcu(&call->rcu, rxrpc_rcu_destroy_call); |
17926a79 DH |
593 | } |
594 | ||
595 | /* | |
2baec2c3 DH |
596 | * Make sure that all calls are gone from a network namespace. To reach this |
597 | * point, any open UDP sockets in that namespace must have been closed, so any | |
598 | * outstanding calls cannot be doing I/O. | |
17926a79 | 599 | */ |
2baec2c3 | 600 | void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) |
17926a79 DH |
601 | { |
602 | struct rxrpc_call *call; | |
603 | ||
604 | _enter(""); | |
8d94aa38 | 605 | |
b1302342 DH |
606 | if (!list_empty(&rxnet->calls)) { |
607 | write_lock(&rxnet->call_lock); | |
248f219c | 608 | |
b1302342 DH |
609 | while (!list_empty(&rxnet->calls)) { |
610 | call = list_entry(rxnet->calls.next, | |
611 | struct rxrpc_call, link); | |
612 | _debug("Zapping call %p", call); | |
17926a79 | 613 | |
b1302342 DH |
614 | rxrpc_see_call(call); |
615 | list_del_init(&call->link); | |
17926a79 | 616 | |
b1302342 DH |
617 | pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", |
618 | call, atomic_read(&call->usage), | |
619 | rxrpc_call_states[call->state], | |
620 | call->flags, call->events); | |
17926a79 | 621 | |
b1302342 DH |
622 | write_unlock(&rxnet->call_lock); |
623 | cond_resched(); | |
624 | write_lock(&rxnet->call_lock); | |
625 | } | |
17926a79 | 626 | |
2baec2c3 | 627 | write_unlock(&rxnet->call_lock); |
17926a79 DH |
628 | } |
629 | ||
d3be4d24 | 630 | atomic_dec(&rxnet->nr_calls); |
5bb053be | 631 | wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); |
17926a79 | 632 | } |