Commit | Line | Data |
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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 | 25 | [RXRPC_CALL_SERVER_SECURING] = "SvSecure", |
1f8481d1 DH |
26 | [RXRPC_CALL_SERVER_RECV_REQUEST] = "SvRcvReq", |
27 | [RXRPC_CALL_SERVER_ACK_REQUEST] = "SvAckReq", | |
28 | [RXRPC_CALL_SERVER_SEND_REPLY] = "SvSndRpl", | |
29 | [RXRPC_CALL_SERVER_AWAIT_ACK] = "SvAwtACK", | |
30 | [RXRPC_CALL_COMPLETE] = "Complete", | |
f5c17aae DH |
31 | }; |
32 | ||
33 | const char *const rxrpc_call_completions[NR__RXRPC_CALL_COMPLETIONS] = { | |
34 | [RXRPC_CALL_SUCCEEDED] = "Complete", | |
1f8481d1 DH |
35 | [RXRPC_CALL_REMOTELY_ABORTED] = "RmtAbort", |
36 | [RXRPC_CALL_LOCALLY_ABORTED] = "LocAbort", | |
f5c17aae | 37 | [RXRPC_CALL_LOCAL_ERROR] = "LocError", |
1f8481d1 | 38 | [RXRPC_CALL_NETWORK_ERROR] = "NetError", |
1f8481d1 DH |
39 | }; |
40 | ||
17926a79 | 41 | struct kmem_cache *rxrpc_call_jar; |
17926a79 | 42 | |
b7a7d674 DH |
43 | static struct semaphore rxrpc_call_limiter = |
44 | __SEMAPHORE_INITIALIZER(rxrpc_call_limiter, 1000); | |
45 | static struct semaphore rxrpc_kernel_call_limiter = | |
46 | __SEMAPHORE_INITIALIZER(rxrpc_kernel_call_limiter, 1000); | |
47 | ||
15f661dc DH |
48 | void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what) |
49 | { | |
f3441d41 | 50 | struct rxrpc_local *local = call->local; |
15f661dc DH |
51 | bool busy; |
52 | ||
03fc55ad | 53 | if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) { |
15f661dc DH |
54 | spin_lock_bh(&local->lock); |
55 | busy = !list_empty(&call->attend_link); | |
56 | trace_rxrpc_poke_call(call, busy, what); | |
a33395ab DH |
57 | if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke)) |
58 | busy = true; | |
15f661dc | 59 | if (!busy) { |
15f661dc DH |
60 | list_add_tail(&call->attend_link, &local->call_attend_q); |
61 | } | |
62 | spin_unlock_bh(&local->lock); | |
a33395ab DH |
63 | if (!busy) |
64 | rxrpc_wake_up_io_thread(local); | |
15f661dc DH |
65 | } |
66 | } | |
67 | ||
e99e88a9 | 68 | static void rxrpc_call_timer_expired(struct timer_list *t) |
248f219c | 69 | { |
e99e88a9 | 70 | struct rxrpc_call *call = from_timer(call, t, timer); |
248f219c DH |
71 | |
72 | _enter("%d", call->debug_id); | |
73 | ||
96b4059f | 74 | if (!__rxrpc_call_is_complete(call)) { |
334dfbfc | 75 | trace_rxrpc_timer_expired(call, jiffies); |
5e6ef4f1 | 76 | rxrpc_poke_call(call, rxrpc_call_poke_timer); |
4a7f62f9 DH |
77 | } |
78 | } | |
79 | ||
80 | void rxrpc_reduce_call_timer(struct rxrpc_call *call, | |
81 | unsigned long expire_at, | |
82 | unsigned long now, | |
83 | enum rxrpc_timer_trace why) | |
84 | { | |
3feda9d6 DH |
85 | trace_rxrpc_timer(call, why, now); |
86 | timer_reduce(&call->timer, expire_at); | |
4a7f62f9 DH |
87 | } |
88 | ||
9faaff59 DH |
89 | static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; |
90 | ||
3feda9d6 DH |
91 | static void rxrpc_destroy_call(struct work_struct *); |
92 | ||
2341e077 DH |
93 | /* |
94 | * find an extant server call | |
95 | * - called in process context with IRQs enabled | |
96 | */ | |
97 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, | |
98 | unsigned long user_call_ID) | |
99 | { | |
100 | struct rxrpc_call *call; | |
101 | struct rb_node *p; | |
102 | ||
103 | _enter("%p,%lx", rx, user_call_ID); | |
104 | ||
105 | read_lock(&rx->call_lock); | |
106 | ||
107 | p = rx->calls.rb_node; | |
108 | while (p) { | |
109 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
110 | ||
111 | if (user_call_ID < call->user_call_ID) | |
112 | p = p->rb_left; | |
113 | else if (user_call_ID > call->user_call_ID) | |
114 | p = p->rb_right; | |
115 | else | |
116 | goto found_extant_call; | |
117 | } | |
118 | ||
119 | read_unlock(&rx->call_lock); | |
120 | _leave(" = NULL"); | |
121 | return NULL; | |
122 | ||
123 | found_extant_call: | |
cb0fc0c9 | 124 | rxrpc_get_call(call, rxrpc_call_get_sendmsg); |
2341e077 | 125 | read_unlock(&rx->call_lock); |
a0575429 | 126 | _leave(" = %p [%d]", call, refcount_read(&call->ref)); |
2341e077 DH |
127 | return call; |
128 | } | |
129 | ||
17926a79 DH |
130 | /* |
131 | * allocate a new call | |
132 | */ | |
a25e21f0 DH |
133 | struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, |
134 | unsigned int debug_id) | |
17926a79 DH |
135 | { |
136 | struct rxrpc_call *call; | |
d3be4d24 | 137 | struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); |
17926a79 DH |
138 | |
139 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
140 | if (!call) | |
141 | return NULL; | |
142 | ||
540b1c48 | 143 | mutex_init(&call->user_mutex); |
9faaff59 DH |
144 | |
145 | /* Prevent lockdep reporting a deadlock false positive between the afs | |
146 | * filesystem and sys_sendmsg() via the mmap sem. | |
147 | */ | |
148 | if (rx->sk.sk_kern_sock) | |
149 | lockdep_set_class(&call->user_mutex, | |
150 | &rxrpc_call_user_mutex_lock_class_key); | |
151 | ||
e99e88a9 | 152 | timer_setup(&call->timer, rxrpc_call_timer_expired, 0); |
3feda9d6 | 153 | INIT_WORK(&call->destroyer, rxrpc_destroy_call); |
999b69f8 | 154 | INIT_LIST_HEAD(&call->link); |
9d35d880 | 155 | INIT_LIST_HEAD(&call->wait_link); |
17926a79 | 156 | INIT_LIST_HEAD(&call->accept_link); |
248f219c DH |
157 | INIT_LIST_HEAD(&call->recvmsg_link); |
158 | INIT_LIST_HEAD(&call->sock_link); | |
15f661dc | 159 | INIT_LIST_HEAD(&call->attend_link); |
cf37b598 | 160 | INIT_LIST_HEAD(&call->tx_sendmsg); |
a4ea4c47 | 161 | INIT_LIST_HEAD(&call->tx_buffer); |
5d7edbc9 DH |
162 | skb_queue_head_init(&call->recvmsg_queue); |
163 | skb_queue_head_init(&call->rx_oos_queue); | |
45025bce | 164 | init_waitqueue_head(&call->waitq); |
20acbd9a | 165 | spin_lock_init(&call->notify_lock); |
a4ea4c47 | 166 | spin_lock_init(&call->tx_lock); |
a0575429 | 167 | refcount_set(&call->ref, 1); |
a25e21f0 | 168 | call->debug_id = debug_id; |
e754eba6 | 169 | call->tx_total_len = -1; |
a158bdd3 DH |
170 | call->next_rx_timo = 20 * HZ; |
171 | call->next_req_timo = 1 * HZ; | |
5bbf9533 DH |
172 | call->ackr_window = 1; |
173 | call->ackr_wtop = 1; | |
17926a79 DH |
174 | |
175 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
176 | ||
75e42126 | 177 | call->rx_winsize = rxrpc_rx_window_size; |
248f219c | 178 | call->tx_winsize = 16; |
57494343 | 179 | |
1fc4fa2a DH |
180 | if (RXRPC_TX_SMSS > 2190) |
181 | call->cong_cwnd = 2; | |
182 | else if (RXRPC_TX_SMSS > 1095) | |
183 | call->cong_cwnd = 3; | |
184 | else | |
185 | call->cong_cwnd = 4; | |
a4ea4c47 | 186 | call->cong_ssthresh = RXRPC_TX_MAX_WINDOW; |
d3be4d24 DH |
187 | |
188 | call->rxnet = rxnet; | |
4700c4d8 | 189 | call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; |
d3be4d24 | 190 | atomic_inc(&rxnet->nr_calls); |
17926a79 DH |
191 | return call; |
192 | } | |
193 | ||
194 | /* | |
999b69f8 | 195 | * Allocate a new client call. |
17926a79 | 196 | */ |
9faaff59 DH |
197 | static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
198 | struct sockaddr_rxrpc *srx, | |
f3441d41 DH |
199 | struct rxrpc_conn_parameters *cp, |
200 | struct rxrpc_call_params *p, | |
a25e21f0 DH |
201 | gfp_t gfp, |
202 | unsigned int debug_id) | |
17926a79 DH |
203 | { |
204 | struct rxrpc_call *call; | |
57494343 | 205 | ktime_t now; |
f3441d41 | 206 | int ret; |
17926a79 DH |
207 | |
208 | _enter(""); | |
209 | ||
a25e21f0 | 210 | call = rxrpc_alloc_call(rx, gfp, debug_id); |
17926a79 DH |
211 | if (!call) |
212 | return ERR_PTR(-ENOMEM); | |
57494343 | 213 | now = ktime_get_real(); |
f3441d41 DH |
214 | call->acks_latest_ts = now; |
215 | call->cong_tstamp = now; | |
f3441d41 DH |
216 | call->dest_srx = *srx; |
217 | call->interruptibility = p->interruptibility; | |
218 | call->tx_total_len = p->tx_total_len; | |
219 | call->key = key_get(cp->key); | |
220 | call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call); | |
fdb99487 | 221 | call->security_level = cp->security_level; |
f3441d41 DH |
222 | if (p->kernel) |
223 | __set_bit(RXRPC_CALL_KERNEL, &call->flags); | |
224 | if (cp->upgrade) | |
225 | __set_bit(RXRPC_CALL_UPGRADE, &call->flags); | |
226 | if (cp->exclusive) | |
227 | __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags); | |
228 | ||
db099c62 DH |
229 | if (p->timeouts.normal) |
230 | call->next_rx_timo = min(msecs_to_jiffies(p->timeouts.normal), 1UL); | |
231 | if (p->timeouts.idle) | |
232 | call->next_req_timo = min(msecs_to_jiffies(p->timeouts.idle), 1UL); | |
233 | if (p->timeouts.hard) | |
234 | call->hard_timo = p->timeouts.hard * HZ; | |
235 | ||
f3441d41 DH |
236 | ret = rxrpc_init_client_call_security(call); |
237 | if (ret < 0) { | |
96b4059f | 238 | rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret); |
f3441d41 DH |
239 | rxrpc_put_call(call, rxrpc_call_put_discard_error); |
240 | return ERR_PTR(ret); | |
241 | } | |
242 | ||
96b4059f DH |
243 | rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN); |
244 | ||
f3441d41 DH |
245 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), |
246 | p->user_call_ID, rxrpc_call_new_client); | |
999b69f8 DH |
247 | |
248 | _leave(" = %p", call); | |
249 | return call; | |
250 | } | |
251 | ||
252 | /* | |
248f219c | 253 | * Initiate the call ack/resend/expiry timer. |
999b69f8 | 254 | */ |
9d35d880 | 255 | void rxrpc_start_call_timer(struct rxrpc_call *call) |
999b69f8 | 256 | { |
a158bdd3 DH |
257 | unsigned long now = jiffies; |
258 | unsigned long j = now + MAX_JIFFY_OFFSET; | |
259 | ||
530403d9 | 260 | call->delay_ack_at = j; |
bd1fdf8c | 261 | call->ack_lost_at = j; |
a158bdd3 DH |
262 | call->resend_at = j; |
263 | call->ping_at = j; | |
5e6ef4f1 | 264 | call->keepalive_at = j; |
a158bdd3 DH |
265 | call->expect_rx_by = j; |
266 | call->expect_req_by = j; | |
db099c62 | 267 | call->expect_term_by = j + call->hard_timo; |
a158bdd3 | 268 | call->timer.expires = now; |
17926a79 DH |
269 | } |
270 | ||
b7a7d674 DH |
271 | /* |
272 | * Wait for a call slot to become available. | |
273 | */ | |
274 | static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) | |
275 | { | |
276 | struct semaphore *limiter = &rxrpc_call_limiter; | |
277 | ||
278 | if (p->kernel) | |
279 | limiter = &rxrpc_kernel_call_limiter; | |
280 | if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { | |
281 | down(limiter); | |
282 | return limiter; | |
283 | } | |
284 | return down_interruptible(limiter) < 0 ? NULL : limiter; | |
285 | } | |
286 | ||
287 | /* | |
288 | * Release a call slot. | |
289 | */ | |
290 | static void rxrpc_put_call_slot(struct rxrpc_call *call) | |
291 | { | |
292 | struct semaphore *limiter = &rxrpc_call_limiter; | |
293 | ||
294 | if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) | |
295 | limiter = &rxrpc_kernel_call_limiter; | |
296 | up(limiter); | |
297 | } | |
298 | ||
9d35d880 DH |
299 | /* |
300 | * Start the process of connecting a call. We obtain a peer and a connection | |
301 | * bundle, but the actual association of a call with a connection is offloaded | |
302 | * to the I/O thread to simplify locking. | |
303 | */ | |
304 | static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp) | |
305 | { | |
306 | struct rxrpc_local *local = call->local; | |
01644a1f | 307 | int ret = -ENOMEM; |
9d35d880 DH |
308 | |
309 | _enter("{%d,%lx},", call->debug_id, call->user_call_ID); | |
310 | ||
311 | call->peer = rxrpc_lookup_peer(local, &call->dest_srx, gfp); | |
312 | if (!call->peer) | |
313 | goto error; | |
314 | ||
315 | ret = rxrpc_look_up_bundle(call, gfp); | |
316 | if (ret < 0) | |
317 | goto error; | |
318 | ||
319 | trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call); | |
320 | rxrpc_get_call(call, rxrpc_call_get_io_thread); | |
321 | spin_lock(&local->client_call_lock); | |
322 | list_add_tail(&call->wait_link, &local->new_client_calls); | |
323 | spin_unlock(&local->client_call_lock); | |
324 | rxrpc_wake_up_io_thread(local); | |
325 | return 0; | |
326 | ||
327 | error: | |
328 | __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); | |
329 | return ret; | |
330 | } | |
331 | ||
17926a79 | 332 | /* |
540b1c48 DH |
333 | * Set up a call for the given parameters. |
334 | * - Called with the socket lock held, which it must release. | |
335 | * - If it returns a call, the call's lock will need releasing by the caller. | |
17926a79 | 336 | */ |
2341e077 | 337 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
19ffa01c | 338 | struct rxrpc_conn_parameters *cp, |
999b69f8 | 339 | struct sockaddr_rxrpc *srx, |
48124178 | 340 | struct rxrpc_call_params *p, |
a25e21f0 DH |
341 | gfp_t gfp, |
342 | unsigned int debug_id) | |
540b1c48 | 343 | __releases(&rx->sk.sk_lock.slock) |
88f2a825 | 344 | __acquires(&call->user_mutex) |
17926a79 | 345 | { |
2341e077 | 346 | struct rxrpc_call *call, *xcall; |
d3be4d24 | 347 | struct rxrpc_net *rxnet; |
b7a7d674 | 348 | struct semaphore *limiter; |
2341e077 | 349 | struct rb_node *parent, **pp; |
999b69f8 | 350 | int ret; |
17926a79 | 351 | |
48124178 | 352 | _enter("%p,%lx", rx, p->user_call_ID); |
17926a79 | 353 | |
b7a7d674 | 354 | limiter = rxrpc_get_call_slot(p, gfp); |
b0f571ec DH |
355 | if (!limiter) { |
356 | release_sock(&rx->sk); | |
b7a7d674 | 357 | return ERR_PTR(-ERESTARTSYS); |
b0f571ec | 358 | } |
b7a7d674 | 359 | |
f3441d41 | 360 | call = rxrpc_alloc_client_call(rx, srx, cp, p, gfp, debug_id); |
2341e077 | 361 | if (IS_ERR(call)) { |
540b1c48 | 362 | release_sock(&rx->sk); |
b7a7d674 | 363 | up(limiter); |
2341e077 DH |
364 | _leave(" = %ld", PTR_ERR(call)); |
365 | return call; | |
17926a79 DH |
366 | } |
367 | ||
540b1c48 DH |
368 | /* We need to protect a partially set up call against the user as we |
369 | * will be acting outside the socket lock. | |
370 | */ | |
371 | mutex_lock(&call->user_mutex); | |
372 | ||
999b69f8 | 373 | /* Publish the call, even though it is incompletely set up as yet */ |
17926a79 DH |
374 | write_lock(&rx->call_lock); |
375 | ||
376 | pp = &rx->calls.rb_node; | |
377 | parent = NULL; | |
378 | while (*pp) { | |
379 | parent = *pp; | |
2341e077 | 380 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 381 | |
48124178 | 382 | if (p->user_call_ID < xcall->user_call_ID) |
17926a79 | 383 | pp = &(*pp)->rb_left; |
48124178 | 384 | else if (p->user_call_ID > xcall->user_call_ID) |
17926a79 DH |
385 | pp = &(*pp)->rb_right; |
386 | else | |
357f5ef6 | 387 | goto error_dup_user_ID; |
17926a79 DH |
388 | } |
389 | ||
248f219c | 390 | rcu_assign_pointer(call->socket, rx); |
48124178 | 391 | call->user_call_ID = p->user_call_ID; |
357f5ef6 | 392 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
cb0fc0c9 | 393 | rxrpc_get_call(call, rxrpc_call_get_userid); |
17926a79 DH |
394 | rb_link_node(&call->sock_node, parent, pp); |
395 | rb_insert_color(&call->sock_node, &rx->calls); | |
248f219c DH |
396 | list_add(&call->sock_link, &rx->sock_calls); |
397 | ||
17926a79 DH |
398 | write_unlock(&rx->call_lock); |
399 | ||
d3be4d24 | 400 | rxnet = call->rxnet; |
3dd9c8b5 | 401 | spin_lock(&rxnet->call_lock); |
ad25f5cb | 402 | list_add_tail_rcu(&call->link, &rxnet->calls); |
3dd9c8b5 | 403 | spin_unlock(&rxnet->call_lock); |
17926a79 | 404 | |
540b1c48 DH |
405 | /* From this point on, the call is protected by its own lock. */ |
406 | release_sock(&rx->sk); | |
407 | ||
248f219c DH |
408 | /* Set up or get a connection record and set the protocol parameters, |
409 | * including channel number and call ID. | |
410 | */ | |
1bab27af | 411 | ret = rxrpc_connect_call(call, gfp); |
999b69f8 | 412 | if (ret < 0) |
65550098 | 413 | goto error_attached_to_socket; |
999b69f8 | 414 | |
17926a79 DH |
415 | _leave(" = %p [new]", call); |
416 | return call; | |
417 | ||
2341e077 DH |
418 | /* We unexpectedly found the user ID in the list after taking |
419 | * the call_lock. This shouldn't happen unless the user races | |
420 | * with itself and tries to add the same user ID twice at the | |
421 | * same time in different threads. | |
422 | */ | |
357f5ef6 | 423 | error_dup_user_ID: |
17926a79 | 424 | write_unlock(&rx->call_lock); |
540b1c48 | 425 | release_sock(&rx->sk); |
96b4059f | 426 | rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST); |
cb0fc0c9 DH |
427 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0, |
428 | rxrpc_call_see_userid_exists); | |
540b1c48 | 429 | mutex_unlock(&call->user_mutex); |
cb0fc0c9 | 430 | rxrpc_put_call(call, rxrpc_call_put_userid_exists); |
65550098 DH |
431 | _leave(" = -EEXIST"); |
432 | return ERR_PTR(-EEXIST); | |
433 | ||
434 | /* We got an error, but the call is attached to the socket and is in | |
9d35d880 DH |
435 | * need of release. However, we might now race with recvmsg() when it |
436 | * completion notifies the socket. Return 0 from sys_sendmsg() and | |
65550098 DH |
437 | * leave the error to recvmsg() to deal with. |
438 | */ | |
439 | error_attached_to_socket: | |
cb0fc0c9 DH |
440 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret, |
441 | rxrpc_call_see_connect_failed); | |
9d35d880 | 442 | rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret); |
65550098 DH |
443 | _leave(" = c=%08x [err]", call->debug_id); |
444 | return call; | |
17926a79 DH |
445 | } |
446 | ||
447 | /* | |
248f219c DH |
448 | * Set up an incoming call. call->conn points to the connection. |
449 | * This is called in BH context and isn't allowed to fail. | |
17926a79 | 450 | */ |
248f219c DH |
451 | void rxrpc_incoming_call(struct rxrpc_sock *rx, |
452 | struct rxrpc_call *call, | |
453 | struct sk_buff *skb) | |
17926a79 | 454 | { |
248f219c | 455 | struct rxrpc_connection *conn = call->conn; |
42886ffe | 456 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c | 457 | u32 chan; |
17926a79 | 458 | |
248f219c | 459 | _enter(",%d", call->conn->debug_id); |
e34d4234 | 460 | |
248f219c DH |
461 | rcu_assign_pointer(call->socket, rx); |
462 | call->call_id = sp->hdr.callNumber; | |
f3441d41 | 463 | call->dest_srx.srx_service = sp->hdr.serviceId; |
248f219c | 464 | call->cid = sp->hdr.cid; |
57494343 | 465 | call->cong_tstamp = skb->tstamp; |
248f219c | 466 | |
a343b174 | 467 | __set_bit(RXRPC_CALL_EXPOSED, &call->flags); |
96b4059f | 468 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); |
a343b174 | 469 | |
5e6ef4f1 DH |
470 | spin_lock(&conn->state_lock); |
471 | ||
472 | switch (conn->state) { | |
473 | case RXRPC_CONN_SERVICE_UNSECURED: | |
474 | case RXRPC_CONN_SERVICE_CHALLENGING: | |
96b4059f | 475 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); |
5e6ef4f1 DH |
476 | break; |
477 | case RXRPC_CONN_SERVICE: | |
96b4059f | 478 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST); |
5e6ef4f1 DH |
479 | break; |
480 | ||
a00ce28b | 481 | case RXRPC_CONN_ABORTED: |
96b4059f DH |
482 | rxrpc_set_call_completion(call, conn->completion, |
483 | conn->abort_code, conn->error); | |
5e6ef4f1 | 484 | break; |
5e6ef4f1 DH |
485 | default: |
486 | BUG(); | |
487 | } | |
488 | ||
5040011d DH |
489 | rxrpc_get_call(call, rxrpc_call_get_io_thread); |
490 | ||
248f219c DH |
491 | /* Set the channel for this call. We don't get channel_lock as we're |
492 | * only defending against the data_ready handler (which we're called | |
493 | * from) and the RESPONSE packet parser (which is only really | |
494 | * interested in call_counter and can cope with a disagreement with the | |
495 | * call pointer). | |
a1399f8b | 496 | */ |
248f219c DH |
497 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
498 | conn->channels[chan].call_counter = call->call_id; | |
499 | conn->channels[chan].call_id = call->call_id; | |
9d35d880 | 500 | conn->channels[chan].call = call; |
5e6ef4f1 | 501 | spin_unlock(&conn->state_lock); |
17926a79 | 502 | |
2cc80086 | 503 | spin_lock(&conn->peer->lock); |
29fb4ec3 | 504 | hlist_add_head(&call->error_link, &conn->peer->error_targets); |
2cc80086 | 505 | spin_unlock(&conn->peer->lock); |
17926a79 | 506 | |
248f219c DH |
507 | rxrpc_start_call_timer(call); |
508 | _leave(""); | |
17926a79 DH |
509 | } |
510 | ||
e34d4234 DH |
511 | /* |
512 | * Note the re-emergence of a call. | |
513 | */ | |
cb0fc0c9 | 514 | void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
e34d4234 | 515 | { |
e34d4234 | 516 | if (call) { |
cb0fc0c9 | 517 | int r = refcount_read(&call->ref); |
e34d4234 | 518 | |
cb0fc0c9 | 519 | trace_rxrpc_call(call->debug_id, r, 0, why); |
e34d4234 DH |
520 | } |
521 | } | |
522 | ||
5e6ef4f1 DH |
523 | struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call, |
524 | enum rxrpc_call_trace why) | |
4a7f62f9 | 525 | { |
cb0fc0c9 | 526 | int r; |
4a7f62f9 | 527 | |
5e6ef4f1 DH |
528 | if (!call || !__refcount_inc_not_zero(&call->ref, &r)) |
529 | return NULL; | |
cb0fc0c9 | 530 | trace_rxrpc_call(call->debug_id, r + 1, 0, why); |
5e6ef4f1 | 531 | return call; |
4a7f62f9 DH |
532 | } |
533 | ||
e34d4234 DH |
534 | /* |
535 | * Note the addition of a ref on a call. | |
536 | */ | |
cb0fc0c9 | 537 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
e34d4234 | 538 | { |
cb0fc0c9 | 539 | int r; |
e34d4234 | 540 | |
cb0fc0c9 DH |
541 | __refcount_inc(&call->ref, &r); |
542 | trace_rxrpc_call(call->debug_id, r + 1, 0, why); | |
e34d4234 DH |
543 | } |
544 | ||
a641fd00 | 545 | /* |
a4ea4c47 | 546 | * Clean up the Rx skb ring. |
a641fd00 DH |
547 | */ |
548 | static void rxrpc_cleanup_ring(struct rxrpc_call *call) | |
549 | { | |
5d7edbc9 DH |
550 | skb_queue_purge(&call->recvmsg_queue); |
551 | skb_queue_purge(&call->rx_oos_queue); | |
a641fd00 DH |
552 | } |
553 | ||
e34d4234 | 554 | /* |
248f219c | 555 | * Detach a call from its owning socket. |
e34d4234 | 556 | */ |
248f219c | 557 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
e34d4234 | 558 | { |
248f219c | 559 | struct rxrpc_connection *conn = call->conn; |
9d35d880 | 560 | bool put = false, putu = false; |
e34d4234 | 561 | |
a0575429 | 562 | _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); |
e34d4234 | 563 | |
cb0fc0c9 DH |
564 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), |
565 | call->flags, rxrpc_call_see_release); | |
17926a79 | 566 | |
17926a79 DH |
567 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) |
568 | BUG(); | |
17926a79 | 569 | |
b7a7d674 | 570 | rxrpc_put_call_slot(call); |
17926a79 | 571 | |
248f219c | 572 | /* Make sure we don't get any more notifications */ |
223f5901 | 573 | spin_lock(&rx->recvmsg_lock); |
e653cfe4 | 574 | |
248f219c | 575 | if (!list_empty(&call->recvmsg_link)) { |
17926a79 DH |
576 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
577 | call, call->events, call->flags); | |
248f219c DH |
578 | list_del(&call->recvmsg_link); |
579 | put = true; | |
580 | } | |
581 | ||
582 | /* list_empty() must return false in rxrpc_notify_socket() */ | |
583 | call->recvmsg_link.next = NULL; | |
584 | call->recvmsg_link.prev = NULL; | |
585 | ||
223f5901 | 586 | spin_unlock(&rx->recvmsg_lock); |
248f219c | 587 | if (put) |
cb0fc0c9 | 588 | rxrpc_put_call(call, rxrpc_call_put_unnotify); |
248f219c DH |
589 | |
590 | write_lock(&rx->call_lock); | |
591 | ||
592 | if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
17926a79 DH |
593 | rb_erase(&call->sock_node, &rx->calls); |
594 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
9d35d880 | 595 | putu = true; |
17926a79 | 596 | } |
17926a79 | 597 | |
248f219c DH |
598 | list_del(&call->sock_link); |
599 | write_unlock(&rx->call_lock); | |
600 | ||
601 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); | |
602 | ||
9d35d880 DH |
603 | if (putu) |
604 | rxrpc_put_call(call, rxrpc_call_put_userid); | |
605 | ||
17926a79 DH |
606 | _leave(""); |
607 | } | |
608 | ||
17926a79 DH |
609 | /* |
610 | * release all the calls associated with a socket | |
611 | */ | |
612 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
613 | { | |
614 | struct rxrpc_call *call; | |
17926a79 DH |
615 | |
616 | _enter("%p", rx); | |
617 | ||
0360da6d DH |
618 | while (!list_empty(&rx->to_be_accepted)) { |
619 | call = list_entry(rx->to_be_accepted.next, | |
620 | struct rxrpc_call, accept_link); | |
621 | list_del(&call->accept_link); | |
57af281e DH |
622 | rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, |
623 | rxrpc_abort_call_sock_release_tba); | |
cb0fc0c9 | 624 | rxrpc_put_call(call, rxrpc_call_put_release_sock_tba); |
0360da6d DH |
625 | } |
626 | ||
248f219c DH |
627 | while (!list_empty(&rx->sock_calls)) { |
628 | call = list_entry(rx->sock_calls.next, | |
629 | struct rxrpc_call, sock_link); | |
cb0fc0c9 | 630 | rxrpc_get_call(call, rxrpc_call_get_release_sock); |
57af281e DH |
631 | rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, |
632 | rxrpc_abort_call_sock_release); | |
8d94aa38 | 633 | rxrpc_release_call(rx, call); |
cb0fc0c9 | 634 | rxrpc_put_call(call, rxrpc_call_put_release_sock); |
f36b5e44 DH |
635 | } |
636 | ||
17926a79 DH |
637 | _leave(""); |
638 | } | |
639 | ||
640 | /* | |
641 | * release a call | |
642 | */ | |
cb0fc0c9 | 643 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
17926a79 | 644 | { |
d3be4d24 | 645 | struct rxrpc_net *rxnet = call->rxnet; |
48c9e0ec | 646 | unsigned int debug_id = call->debug_id; |
a0575429 | 647 | bool dead; |
cb0fc0c9 | 648 | int r; |
17926a79 | 649 | |
e34d4234 | 650 | ASSERT(call != NULL); |
17926a79 | 651 | |
cb0fc0c9 DH |
652 | dead = __refcount_dec_and_test(&call->ref, &r); |
653 | trace_rxrpc_call(debug_id, r - 1, 0, why); | |
a0575429 | 654 | if (dead) { |
96b4059f | 655 | ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); |
17926a79 | 656 | |
2baec2c3 | 657 | if (!list_empty(&call->link)) { |
3dd9c8b5 | 658 | spin_lock(&rxnet->call_lock); |
2baec2c3 | 659 | list_del_init(&call->link); |
3dd9c8b5 | 660 | spin_unlock(&rxnet->call_lock); |
2baec2c3 | 661 | } |
e34d4234 | 662 | |
8d94aa38 | 663 | rxrpc_cleanup_call(call); |
17926a79 | 664 | } |
17926a79 DH |
665 | } |
666 | ||
dee46364 | 667 | /* |
3feda9d6 | 668 | * Free up the call under RCU. |
dee46364 | 669 | */ |
3feda9d6 | 670 | static void rxrpc_rcu_free_call(struct rcu_head *rcu) |
dee46364 | 671 | { |
3feda9d6 DH |
672 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); |
673 | struct rxrpc_net *rxnet = READ_ONCE(call->rxnet); | |
4a7f62f9 | 674 | |
dee46364 | 675 | kmem_cache_free(rxrpc_call_jar, call); |
d3be4d24 | 676 | if (atomic_dec_and_test(&rxnet->nr_calls)) |
5bb053be | 677 | wake_up_var(&rxnet->nr_calls); |
dee46364 DH |
678 | } |
679 | ||
963485d4 | 680 | /* |
3feda9d6 | 681 | * Final call destruction - but must be done in process context. |
963485d4 | 682 | */ |
3feda9d6 | 683 | static void rxrpc_destroy_call(struct work_struct *work) |
963485d4 | 684 | { |
3feda9d6 DH |
685 | struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer); |
686 | struct rxrpc_txbuf *txb; | |
963485d4 | 687 | |
3feda9d6 DH |
688 | del_timer_sync(&call->timer); |
689 | ||
690 | rxrpc_cleanup_ring(call); | |
cf37b598 DH |
691 | while ((txb = list_first_entry_or_null(&call->tx_sendmsg, |
692 | struct rxrpc_txbuf, call_link))) { | |
693 | list_del(&txb->call_link); | |
694 | rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); | |
695 | } | |
3feda9d6 DH |
696 | while ((txb = list_first_entry_or_null(&call->tx_buffer, |
697 | struct rxrpc_txbuf, call_link))) { | |
698 | list_del(&txb->call_link); | |
699 | rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); | |
963485d4 | 700 | } |
5e6ef4f1 | 701 | |
3feda9d6 | 702 | rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); |
3feda9d6 | 703 | rxrpc_put_connection(call->conn, rxrpc_conn_put_call); |
1bab27af DH |
704 | rxrpc_deactivate_bundle(call->bundle); |
705 | rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call); | |
3feda9d6 | 706 | rxrpc_put_peer(call->peer, rxrpc_peer_put_call); |
f3441d41 | 707 | rxrpc_put_local(call->local, rxrpc_local_put_call); |
3feda9d6 | 708 | call_rcu(&call->rcu, rxrpc_rcu_free_call); |
963485d4 DH |
709 | } |
710 | ||
17926a79 DH |
711 | /* |
712 | * clean up a call | |
713 | */ | |
00e90712 | 714 | void rxrpc_cleanup_call(struct rxrpc_call *call) |
17926a79 | 715 | { |
17926a79 DH |
716 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); |
717 | ||
96b4059f | 718 | ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); |
17926a79 | 719 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
17926a79 | 720 | |
5e6ef4f1 | 721 | del_timer(&call->timer); |
17926a79 | 722 | |
5e6ef4f1 | 723 | if (rcu_read_lock_held()) |
3feda9d6 DH |
724 | /* Can't use the rxrpc workqueue as we need to cancel/flush |
725 | * something that may be running/waiting there. | |
726 | */ | |
727 | schedule_work(&call->destroyer); | |
728 | else | |
729 | rxrpc_destroy_call(&call->destroyer); | |
17926a79 DH |
730 | } |
731 | ||
732 | /* | |
2baec2c3 DH |
733 | * Make sure that all calls are gone from a network namespace. To reach this |
734 | * point, any open UDP sockets in that namespace must have been closed, so any | |
735 | * outstanding calls cannot be doing I/O. | |
17926a79 | 736 | */ |
2baec2c3 | 737 | void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) |
17926a79 DH |
738 | { |
739 | struct rxrpc_call *call; | |
740 | ||
741 | _enter(""); | |
8d94aa38 | 742 | |
b1302342 | 743 | if (!list_empty(&rxnet->calls)) { |
3dd9c8b5 | 744 | spin_lock(&rxnet->call_lock); |
248f219c | 745 | |
b1302342 DH |
746 | while (!list_empty(&rxnet->calls)) { |
747 | call = list_entry(rxnet->calls.next, | |
748 | struct rxrpc_call, link); | |
749 | _debug("Zapping call %p", call); | |
17926a79 | 750 | |
cb0fc0c9 | 751 | rxrpc_see_call(call, rxrpc_call_see_zap); |
b1302342 | 752 | list_del_init(&call->link); |
17926a79 | 753 | |
b1302342 | 754 | pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", |
a0575429 | 755 | call, refcount_read(&call->ref), |
96b4059f | 756 | rxrpc_call_states[__rxrpc_call_state(call)], |
b1302342 | 757 | call->flags, call->events); |
17926a79 | 758 | |
3dd9c8b5 | 759 | spin_unlock(&rxnet->call_lock); |
b1302342 | 760 | cond_resched(); |
3dd9c8b5 | 761 | spin_lock(&rxnet->call_lock); |
b1302342 | 762 | } |
17926a79 | 763 | |
3dd9c8b5 | 764 | spin_unlock(&rxnet->call_lock); |
17926a79 DH |
765 | } |
766 | ||
d3be4d24 | 767 | atomic_dec(&rxnet->nr_calls); |
5bb053be | 768 | wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); |
17926a79 | 769 | } |