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 | 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 | |
48380368 PZ |
43 | static DEFINE_SEMAPHORE(rxrpc_call_limiter, 1000); |
44 | static DEFINE_SEMAPHORE(rxrpc_kernel_call_limiter, 1000); | |
b7a7d674 | 45 | |
15f661dc DH |
46 | void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what) |
47 | { | |
f3441d41 | 48 | struct rxrpc_local *local = call->local; |
15f661dc DH |
49 | bool busy; |
50 | ||
03fc55ad | 51 | if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) { |
15f661dc DH |
52 | spin_lock_bh(&local->lock); |
53 | busy = !list_empty(&call->attend_link); | |
54 | trace_rxrpc_poke_call(call, busy, what); | |
a33395ab DH |
55 | if (!busy && !rxrpc_try_get_call(call, rxrpc_call_get_poke)) |
56 | busy = true; | |
15f661dc | 57 | if (!busy) { |
15f661dc DH |
58 | list_add_tail(&call->attend_link, &local->call_attend_q); |
59 | } | |
60 | spin_unlock_bh(&local->lock); | |
a33395ab DH |
61 | if (!busy) |
62 | rxrpc_wake_up_io_thread(local); | |
15f661dc DH |
63 | } |
64 | } | |
65 | ||
e99e88a9 | 66 | static void rxrpc_call_timer_expired(struct timer_list *t) |
248f219c | 67 | { |
e99e88a9 | 68 | struct rxrpc_call *call = from_timer(call, t, timer); |
248f219c DH |
69 | |
70 | _enter("%d", call->debug_id); | |
71 | ||
96b4059f | 72 | if (!__rxrpc_call_is_complete(call)) { |
153f90a0 | 73 | trace_rxrpc_timer_expired(call); |
5e6ef4f1 | 74 | rxrpc_poke_call(call, rxrpc_call_poke_timer); |
4a7f62f9 DH |
75 | } |
76 | } | |
77 | ||
9faaff59 DH |
78 | static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; |
79 | ||
3feda9d6 DH |
80 | static void rxrpc_destroy_call(struct work_struct *); |
81 | ||
2341e077 DH |
82 | /* |
83 | * find an extant server call | |
84 | * - called in process context with IRQs enabled | |
85 | */ | |
86 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, | |
87 | unsigned long user_call_ID) | |
88 | { | |
89 | struct rxrpc_call *call; | |
90 | struct rb_node *p; | |
91 | ||
92 | _enter("%p,%lx", rx, user_call_ID); | |
93 | ||
94 | read_lock(&rx->call_lock); | |
95 | ||
96 | p = rx->calls.rb_node; | |
97 | while (p) { | |
98 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
99 | ||
100 | if (user_call_ID < call->user_call_ID) | |
101 | p = p->rb_left; | |
102 | else if (user_call_ID > call->user_call_ID) | |
103 | p = p->rb_right; | |
104 | else | |
105 | goto found_extant_call; | |
106 | } | |
107 | ||
108 | read_unlock(&rx->call_lock); | |
109 | _leave(" = NULL"); | |
110 | return NULL; | |
111 | ||
112 | found_extant_call: | |
cb0fc0c9 | 113 | rxrpc_get_call(call, rxrpc_call_get_sendmsg); |
2341e077 | 114 | read_unlock(&rx->call_lock); |
a0575429 | 115 | _leave(" = %p [%d]", call, refcount_read(&call->ref)); |
2341e077 DH |
116 | return call; |
117 | } | |
118 | ||
17926a79 DH |
119 | /* |
120 | * allocate a new call | |
121 | */ | |
a25e21f0 DH |
122 | struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, |
123 | unsigned int debug_id) | |
17926a79 DH |
124 | { |
125 | struct rxrpc_call *call; | |
d3be4d24 | 126 | struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); |
17926a79 DH |
127 | |
128 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
129 | if (!call) | |
130 | return NULL; | |
131 | ||
540b1c48 | 132 | mutex_init(&call->user_mutex); |
9faaff59 DH |
133 | |
134 | /* Prevent lockdep reporting a deadlock false positive between the afs | |
135 | * filesystem and sys_sendmsg() via the mmap sem. | |
136 | */ | |
137 | if (rx->sk.sk_kern_sock) | |
138 | lockdep_set_class(&call->user_mutex, | |
139 | &rxrpc_call_user_mutex_lock_class_key); | |
140 | ||
e99e88a9 | 141 | timer_setup(&call->timer, rxrpc_call_timer_expired, 0); |
3feda9d6 | 142 | INIT_WORK(&call->destroyer, rxrpc_destroy_call); |
999b69f8 | 143 | INIT_LIST_HEAD(&call->link); |
9d35d880 | 144 | INIT_LIST_HEAD(&call->wait_link); |
17926a79 | 145 | INIT_LIST_HEAD(&call->accept_link); |
248f219c DH |
146 | INIT_LIST_HEAD(&call->recvmsg_link); |
147 | INIT_LIST_HEAD(&call->sock_link); | |
15f661dc | 148 | INIT_LIST_HEAD(&call->attend_link); |
cf37b598 | 149 | INIT_LIST_HEAD(&call->tx_sendmsg); |
a4ea4c47 | 150 | INIT_LIST_HEAD(&call->tx_buffer); |
5d7edbc9 DH |
151 | skb_queue_head_init(&call->recvmsg_queue); |
152 | skb_queue_head_init(&call->rx_oos_queue); | |
45025bce | 153 | init_waitqueue_head(&call->waitq); |
20acbd9a | 154 | spin_lock_init(&call->notify_lock); |
a4ea4c47 | 155 | spin_lock_init(&call->tx_lock); |
a0575429 | 156 | refcount_set(&call->ref, 1); |
153f90a0 DH |
157 | call->debug_id = debug_id; |
158 | call->tx_total_len = -1; | |
159 | call->next_rx_timo = 20 * HZ; | |
160 | call->next_req_timo = 1 * HZ; | |
161 | call->ackr_window = 1; | |
162 | call->ackr_wtop = 1; | |
163 | call->delay_ack_at = KTIME_MAX; | |
164 | call->ack_lost_at = KTIME_MAX; | |
165 | call->resend_at = KTIME_MAX; | |
166 | call->ping_at = KTIME_MAX; | |
167 | call->keepalive_at = KTIME_MAX; | |
168 | call->expect_rx_by = KTIME_MAX; | |
169 | call->expect_req_by = KTIME_MAX; | |
170 | call->expect_term_by = KTIME_MAX; | |
17926a79 DH |
171 | |
172 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
173 | ||
75e42126 | 174 | call->rx_winsize = rxrpc_rx_window_size; |
248f219c | 175 | call->tx_winsize = 16; |
57494343 | 176 | |
ba4e1038 | 177 | call->cong_cwnd = RXRPC_MIN_CWND; |
a4ea4c47 | 178 | call->cong_ssthresh = RXRPC_TX_MAX_WINDOW; |
d3be4d24 DH |
179 | |
180 | call->rxnet = rxnet; | |
4700c4d8 | 181 | call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; |
d3be4d24 | 182 | atomic_inc(&rxnet->nr_calls); |
17926a79 DH |
183 | return call; |
184 | } | |
185 | ||
186 | /* | |
999b69f8 | 187 | * Allocate a new client call. |
17926a79 | 188 | */ |
9faaff59 | 189 | static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
f3441d41 DH |
190 | struct rxrpc_conn_parameters *cp, |
191 | struct rxrpc_call_params *p, | |
a25e21f0 DH |
192 | gfp_t gfp, |
193 | unsigned int debug_id) | |
17926a79 DH |
194 | { |
195 | struct rxrpc_call *call; | |
57494343 | 196 | ktime_t now; |
f3441d41 | 197 | int ret; |
17926a79 DH |
198 | |
199 | _enter(""); | |
200 | ||
a25e21f0 | 201 | call = rxrpc_alloc_call(rx, gfp, debug_id); |
17926a79 DH |
202 | if (!call) |
203 | return ERR_PTR(-ENOMEM); | |
57494343 | 204 | now = ktime_get_real(); |
f3441d41 DH |
205 | call->acks_latest_ts = now; |
206 | call->cong_tstamp = now; | |
72904d7b DH |
207 | call->dest_srx = cp->peer->srx; |
208 | call->dest_srx.srx_service = cp->service_id; | |
f3441d41 DH |
209 | call->interruptibility = p->interruptibility; |
210 | call->tx_total_len = p->tx_total_len; | |
211 | call->key = key_get(cp->key); | |
72904d7b | 212 | call->peer = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call); |
f3441d41 | 213 | call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call); |
fdb99487 | 214 | call->security_level = cp->security_level; |
f3441d41 DH |
215 | if (p->kernel) |
216 | __set_bit(RXRPC_CALL_KERNEL, &call->flags); | |
217 | if (cp->upgrade) | |
218 | __set_bit(RXRPC_CALL_UPGRADE, &call->flags); | |
219 | if (cp->exclusive) | |
220 | __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags); | |
221 | ||
db099c62 | 222 | if (p->timeouts.normal) |
153f90a0 | 223 | call->next_rx_timo = min(p->timeouts.normal, 1); |
db099c62 | 224 | if (p->timeouts.idle) |
153f90a0 | 225 | call->next_req_timo = min(p->timeouts.idle, 1); |
db099c62 | 226 | if (p->timeouts.hard) |
153f90a0 | 227 | call->hard_timo = p->timeouts.hard; |
db099c62 | 228 | |
f3441d41 DH |
229 | ret = rxrpc_init_client_call_security(call); |
230 | if (ret < 0) { | |
96b4059f | 231 | rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret); |
f3441d41 DH |
232 | rxrpc_put_call(call, rxrpc_call_put_discard_error); |
233 | return ERR_PTR(ret); | |
234 | } | |
235 | ||
96b4059f DH |
236 | rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN); |
237 | ||
f3441d41 DH |
238 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), |
239 | p->user_call_ID, rxrpc_call_new_client); | |
999b69f8 DH |
240 | |
241 | _leave(" = %p", call); | |
242 | return call; | |
243 | } | |
244 | ||
245 | /* | |
248f219c | 246 | * Initiate the call ack/resend/expiry timer. |
999b69f8 | 247 | */ |
9d35d880 | 248 | void rxrpc_start_call_timer(struct rxrpc_call *call) |
999b69f8 | 249 | { |
153f90a0 DH |
250 | if (call->hard_timo) { |
251 | ktime_t delay = ms_to_ktime(call->hard_timo * 1000); | |
252 | ||
253 | call->expect_term_by = ktime_add(ktime_get_real(), delay); | |
254 | trace_rxrpc_timer_set(call, delay, rxrpc_timer_trace_hard); | |
255 | } | |
256 | call->timer.expires = jiffies; | |
17926a79 DH |
257 | } |
258 | ||
b7a7d674 DH |
259 | /* |
260 | * Wait for a call slot to become available. | |
261 | */ | |
262 | static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) | |
263 | { | |
264 | struct semaphore *limiter = &rxrpc_call_limiter; | |
265 | ||
266 | if (p->kernel) | |
267 | limiter = &rxrpc_kernel_call_limiter; | |
268 | if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { | |
269 | down(limiter); | |
270 | return limiter; | |
271 | } | |
272 | return down_interruptible(limiter) < 0 ? NULL : limiter; | |
273 | } | |
274 | ||
275 | /* | |
276 | * Release a call slot. | |
277 | */ | |
278 | static void rxrpc_put_call_slot(struct rxrpc_call *call) | |
279 | { | |
280 | struct semaphore *limiter = &rxrpc_call_limiter; | |
281 | ||
282 | if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) | |
283 | limiter = &rxrpc_kernel_call_limiter; | |
284 | up(limiter); | |
285 | } | |
286 | ||
9d35d880 DH |
287 | /* |
288 | * Start the process of connecting a call. We obtain a peer and a connection | |
289 | * bundle, but the actual association of a call with a connection is offloaded | |
290 | * to the I/O thread to simplify locking. | |
291 | */ | |
292 | static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp) | |
293 | { | |
294 | struct rxrpc_local *local = call->local; | |
01644a1f | 295 | int ret = -ENOMEM; |
9d35d880 DH |
296 | |
297 | _enter("{%d,%lx},", call->debug_id, call->user_call_ID); | |
298 | ||
9d35d880 DH |
299 | ret = rxrpc_look_up_bundle(call, gfp); |
300 | if (ret < 0) | |
301 | goto error; | |
302 | ||
303 | trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call); | |
304 | rxrpc_get_call(call, rxrpc_call_get_io_thread); | |
305 | spin_lock(&local->client_call_lock); | |
306 | list_add_tail(&call->wait_link, &local->new_client_calls); | |
307 | spin_unlock(&local->client_call_lock); | |
308 | rxrpc_wake_up_io_thread(local); | |
309 | return 0; | |
310 | ||
311 | error: | |
312 | __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); | |
313 | return ret; | |
314 | } | |
315 | ||
17926a79 | 316 | /* |
540b1c48 DH |
317 | * Set up a call for the given parameters. |
318 | * - Called with the socket lock held, which it must release. | |
319 | * - If it returns a call, the call's lock will need releasing by the caller. | |
17926a79 | 320 | */ |
2341e077 | 321 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
19ffa01c | 322 | struct rxrpc_conn_parameters *cp, |
48124178 | 323 | struct rxrpc_call_params *p, |
a25e21f0 DH |
324 | gfp_t gfp, |
325 | unsigned int debug_id) | |
540b1c48 | 326 | __releases(&rx->sk.sk_lock.slock) |
88f2a825 | 327 | __acquires(&call->user_mutex) |
17926a79 | 328 | { |
2341e077 | 329 | struct rxrpc_call *call, *xcall; |
d3be4d24 | 330 | struct rxrpc_net *rxnet; |
b7a7d674 | 331 | struct semaphore *limiter; |
2341e077 | 332 | struct rb_node *parent, **pp; |
999b69f8 | 333 | int ret; |
17926a79 | 334 | |
48124178 | 335 | _enter("%p,%lx", rx, p->user_call_ID); |
17926a79 | 336 | |
72904d7b DH |
337 | if (WARN_ON_ONCE(!cp->peer)) { |
338 | release_sock(&rx->sk); | |
339 | return ERR_PTR(-EIO); | |
340 | } | |
341 | ||
b7a7d674 | 342 | limiter = rxrpc_get_call_slot(p, gfp); |
b0f571ec DH |
343 | if (!limiter) { |
344 | release_sock(&rx->sk); | |
b7a7d674 | 345 | return ERR_PTR(-ERESTARTSYS); |
b0f571ec | 346 | } |
b7a7d674 | 347 | |
72904d7b | 348 | call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id); |
2341e077 | 349 | if (IS_ERR(call)) { |
540b1c48 | 350 | release_sock(&rx->sk); |
b7a7d674 | 351 | up(limiter); |
2341e077 DH |
352 | _leave(" = %ld", PTR_ERR(call)); |
353 | return call; | |
17926a79 DH |
354 | } |
355 | ||
540b1c48 DH |
356 | /* We need to protect a partially set up call against the user as we |
357 | * will be acting outside the socket lock. | |
358 | */ | |
359 | mutex_lock(&call->user_mutex); | |
360 | ||
999b69f8 | 361 | /* Publish the call, even though it is incompletely set up as yet */ |
17926a79 DH |
362 | write_lock(&rx->call_lock); |
363 | ||
364 | pp = &rx->calls.rb_node; | |
365 | parent = NULL; | |
366 | while (*pp) { | |
367 | parent = *pp; | |
2341e077 | 368 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 369 | |
48124178 | 370 | if (p->user_call_ID < xcall->user_call_ID) |
17926a79 | 371 | pp = &(*pp)->rb_left; |
48124178 | 372 | else if (p->user_call_ID > xcall->user_call_ID) |
17926a79 DH |
373 | pp = &(*pp)->rb_right; |
374 | else | |
357f5ef6 | 375 | goto error_dup_user_ID; |
17926a79 DH |
376 | } |
377 | ||
248f219c | 378 | rcu_assign_pointer(call->socket, rx); |
48124178 | 379 | call->user_call_ID = p->user_call_ID; |
357f5ef6 | 380 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
cb0fc0c9 | 381 | rxrpc_get_call(call, rxrpc_call_get_userid); |
17926a79 DH |
382 | rb_link_node(&call->sock_node, parent, pp); |
383 | rb_insert_color(&call->sock_node, &rx->calls); | |
248f219c DH |
384 | list_add(&call->sock_link, &rx->sock_calls); |
385 | ||
17926a79 DH |
386 | write_unlock(&rx->call_lock); |
387 | ||
d3be4d24 | 388 | rxnet = call->rxnet; |
3dd9c8b5 | 389 | spin_lock(&rxnet->call_lock); |
ad25f5cb | 390 | list_add_tail_rcu(&call->link, &rxnet->calls); |
3dd9c8b5 | 391 | spin_unlock(&rxnet->call_lock); |
17926a79 | 392 | |
540b1c48 DH |
393 | /* From this point on, the call is protected by its own lock. */ |
394 | release_sock(&rx->sk); | |
395 | ||
248f219c DH |
396 | /* Set up or get a connection record and set the protocol parameters, |
397 | * including channel number and call ID. | |
398 | */ | |
1bab27af | 399 | ret = rxrpc_connect_call(call, gfp); |
999b69f8 | 400 | if (ret < 0) |
65550098 | 401 | goto error_attached_to_socket; |
999b69f8 | 402 | |
17926a79 DH |
403 | _leave(" = %p [new]", call); |
404 | return call; | |
405 | ||
2341e077 DH |
406 | /* We unexpectedly found the user ID in the list after taking |
407 | * the call_lock. This shouldn't happen unless the user races | |
408 | * with itself and tries to add the same user ID twice at the | |
409 | * same time in different threads. | |
410 | */ | |
357f5ef6 | 411 | error_dup_user_ID: |
17926a79 | 412 | write_unlock(&rx->call_lock); |
540b1c48 | 413 | release_sock(&rx->sk); |
96b4059f | 414 | rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST); |
cb0fc0c9 DH |
415 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0, |
416 | rxrpc_call_see_userid_exists); | |
540b1c48 | 417 | mutex_unlock(&call->user_mutex); |
cb0fc0c9 | 418 | rxrpc_put_call(call, rxrpc_call_put_userid_exists); |
65550098 DH |
419 | _leave(" = -EEXIST"); |
420 | return ERR_PTR(-EEXIST); | |
421 | ||
422 | /* We got an error, but the call is attached to the socket and is in | |
9d35d880 DH |
423 | * need of release. However, we might now race with recvmsg() when it |
424 | * completion notifies the socket. Return 0 from sys_sendmsg() and | |
65550098 DH |
425 | * leave the error to recvmsg() to deal with. |
426 | */ | |
427 | error_attached_to_socket: | |
cb0fc0c9 DH |
428 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret, |
429 | rxrpc_call_see_connect_failed); | |
9d35d880 | 430 | rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret); |
65550098 DH |
431 | _leave(" = c=%08x [err]", call->debug_id); |
432 | return call; | |
17926a79 DH |
433 | } |
434 | ||
435 | /* | |
248f219c DH |
436 | * Set up an incoming call. call->conn points to the connection. |
437 | * This is called in BH context and isn't allowed to fail. | |
17926a79 | 438 | */ |
248f219c DH |
439 | void rxrpc_incoming_call(struct rxrpc_sock *rx, |
440 | struct rxrpc_call *call, | |
441 | struct sk_buff *skb) | |
17926a79 | 442 | { |
248f219c | 443 | struct rxrpc_connection *conn = call->conn; |
42886ffe | 444 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c | 445 | u32 chan; |
17926a79 | 446 | |
248f219c | 447 | _enter(",%d", call->conn->debug_id); |
e34d4234 | 448 | |
248f219c DH |
449 | rcu_assign_pointer(call->socket, rx); |
450 | call->call_id = sp->hdr.callNumber; | |
f3441d41 | 451 | call->dest_srx.srx_service = sp->hdr.serviceId; |
248f219c | 452 | call->cid = sp->hdr.cid; |
57494343 | 453 | call->cong_tstamp = skb->tstamp; |
248f219c | 454 | |
a343b174 | 455 | __set_bit(RXRPC_CALL_EXPOSED, &call->flags); |
96b4059f | 456 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); |
a343b174 | 457 | |
5e6ef4f1 DH |
458 | spin_lock(&conn->state_lock); |
459 | ||
460 | switch (conn->state) { | |
461 | case RXRPC_CONN_SERVICE_UNSECURED: | |
462 | case RXRPC_CONN_SERVICE_CHALLENGING: | |
96b4059f | 463 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); |
5e6ef4f1 DH |
464 | break; |
465 | case RXRPC_CONN_SERVICE: | |
96b4059f | 466 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST); |
5e6ef4f1 DH |
467 | break; |
468 | ||
a00ce28b | 469 | case RXRPC_CONN_ABORTED: |
96b4059f DH |
470 | rxrpc_set_call_completion(call, conn->completion, |
471 | conn->abort_code, conn->error); | |
5e6ef4f1 | 472 | break; |
5e6ef4f1 DH |
473 | default: |
474 | BUG(); | |
475 | } | |
476 | ||
5040011d DH |
477 | rxrpc_get_call(call, rxrpc_call_get_io_thread); |
478 | ||
248f219c DH |
479 | /* Set the channel for this call. We don't get channel_lock as we're |
480 | * only defending against the data_ready handler (which we're called | |
481 | * from) and the RESPONSE packet parser (which is only really | |
482 | * interested in call_counter and can cope with a disagreement with the | |
483 | * call pointer). | |
a1399f8b | 484 | */ |
248f219c DH |
485 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
486 | conn->channels[chan].call_counter = call->call_id; | |
487 | conn->channels[chan].call_id = call->call_id; | |
9d35d880 | 488 | conn->channels[chan].call = call; |
5e6ef4f1 | 489 | spin_unlock(&conn->state_lock); |
17926a79 | 490 | |
2cc80086 | 491 | spin_lock(&conn->peer->lock); |
29fb4ec3 | 492 | hlist_add_head(&call->error_link, &conn->peer->error_targets); |
2cc80086 | 493 | spin_unlock(&conn->peer->lock); |
17926a79 | 494 | |
248f219c DH |
495 | rxrpc_start_call_timer(call); |
496 | _leave(""); | |
17926a79 DH |
497 | } |
498 | ||
e34d4234 DH |
499 | /* |
500 | * Note the re-emergence of a call. | |
501 | */ | |
cb0fc0c9 | 502 | void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
e34d4234 | 503 | { |
e34d4234 | 504 | if (call) { |
cb0fc0c9 | 505 | int r = refcount_read(&call->ref); |
e34d4234 | 506 | |
cb0fc0c9 | 507 | trace_rxrpc_call(call->debug_id, r, 0, why); |
e34d4234 DH |
508 | } |
509 | } | |
510 | ||
5e6ef4f1 DH |
511 | struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call, |
512 | enum rxrpc_call_trace why) | |
4a7f62f9 | 513 | { |
cb0fc0c9 | 514 | int r; |
4a7f62f9 | 515 | |
5e6ef4f1 DH |
516 | if (!call || !__refcount_inc_not_zero(&call->ref, &r)) |
517 | return NULL; | |
cb0fc0c9 | 518 | trace_rxrpc_call(call->debug_id, r + 1, 0, why); |
5e6ef4f1 | 519 | return call; |
4a7f62f9 DH |
520 | } |
521 | ||
e34d4234 DH |
522 | /* |
523 | * Note the addition of a ref on a call. | |
524 | */ | |
cb0fc0c9 | 525 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
e34d4234 | 526 | { |
cb0fc0c9 | 527 | int r; |
e34d4234 | 528 | |
cb0fc0c9 DH |
529 | __refcount_inc(&call->ref, &r); |
530 | trace_rxrpc_call(call->debug_id, r + 1, 0, why); | |
e34d4234 DH |
531 | } |
532 | ||
a641fd00 | 533 | /* |
a4ea4c47 | 534 | * Clean up the Rx skb ring. |
a641fd00 DH |
535 | */ |
536 | static void rxrpc_cleanup_ring(struct rxrpc_call *call) | |
537 | { | |
4fc68c4c DH |
538 | rxrpc_purge_queue(&call->recvmsg_queue); |
539 | rxrpc_purge_queue(&call->rx_oos_queue); | |
a641fd00 DH |
540 | } |
541 | ||
e34d4234 | 542 | /* |
248f219c | 543 | * Detach a call from its owning socket. |
e34d4234 | 544 | */ |
248f219c | 545 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
e34d4234 | 546 | { |
248f219c | 547 | struct rxrpc_connection *conn = call->conn; |
9d35d880 | 548 | bool put = false, putu = false; |
e34d4234 | 549 | |
a0575429 | 550 | _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); |
e34d4234 | 551 | |
cb0fc0c9 DH |
552 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), |
553 | call->flags, rxrpc_call_see_release); | |
17926a79 | 554 | |
17926a79 DH |
555 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) |
556 | BUG(); | |
17926a79 | 557 | |
b7a7d674 | 558 | rxrpc_put_call_slot(call); |
17926a79 | 559 | |
248f219c | 560 | /* Make sure we don't get any more notifications */ |
223f5901 | 561 | spin_lock(&rx->recvmsg_lock); |
e653cfe4 | 562 | |
248f219c | 563 | if (!list_empty(&call->recvmsg_link)) { |
17926a79 DH |
564 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
565 | call, call->events, call->flags); | |
248f219c DH |
566 | list_del(&call->recvmsg_link); |
567 | put = true; | |
568 | } | |
569 | ||
570 | /* list_empty() must return false in rxrpc_notify_socket() */ | |
571 | call->recvmsg_link.next = NULL; | |
572 | call->recvmsg_link.prev = NULL; | |
573 | ||
223f5901 | 574 | spin_unlock(&rx->recvmsg_lock); |
248f219c | 575 | if (put) |
cb0fc0c9 | 576 | rxrpc_put_call(call, rxrpc_call_put_unnotify); |
248f219c DH |
577 | |
578 | write_lock(&rx->call_lock); | |
579 | ||
580 | if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
17926a79 DH |
581 | rb_erase(&call->sock_node, &rx->calls); |
582 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
9d35d880 | 583 | putu = true; |
17926a79 | 584 | } |
17926a79 | 585 | |
248f219c DH |
586 | list_del(&call->sock_link); |
587 | write_unlock(&rx->call_lock); | |
588 | ||
589 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); | |
590 | ||
9d35d880 DH |
591 | if (putu) |
592 | rxrpc_put_call(call, rxrpc_call_put_userid); | |
593 | ||
17926a79 DH |
594 | _leave(""); |
595 | } | |
596 | ||
17926a79 DH |
597 | /* |
598 | * release all the calls associated with a socket | |
599 | */ | |
600 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
601 | { | |
602 | struct rxrpc_call *call; | |
17926a79 DH |
603 | |
604 | _enter("%p", rx); | |
605 | ||
0360da6d DH |
606 | while (!list_empty(&rx->to_be_accepted)) { |
607 | call = list_entry(rx->to_be_accepted.next, | |
608 | struct rxrpc_call, accept_link); | |
609 | list_del(&call->accept_link); | |
57af281e DH |
610 | rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, |
611 | rxrpc_abort_call_sock_release_tba); | |
cb0fc0c9 | 612 | rxrpc_put_call(call, rxrpc_call_put_release_sock_tba); |
0360da6d DH |
613 | } |
614 | ||
248f219c DH |
615 | while (!list_empty(&rx->sock_calls)) { |
616 | call = list_entry(rx->sock_calls.next, | |
617 | struct rxrpc_call, sock_link); | |
cb0fc0c9 | 618 | rxrpc_get_call(call, rxrpc_call_get_release_sock); |
57af281e DH |
619 | rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, |
620 | rxrpc_abort_call_sock_release); | |
8d94aa38 | 621 | rxrpc_release_call(rx, call); |
cb0fc0c9 | 622 | rxrpc_put_call(call, rxrpc_call_put_release_sock); |
f36b5e44 DH |
623 | } |
624 | ||
17926a79 DH |
625 | _leave(""); |
626 | } | |
627 | ||
628 | /* | |
629 | * release a call | |
630 | */ | |
cb0fc0c9 | 631 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
17926a79 | 632 | { |
d3be4d24 | 633 | struct rxrpc_net *rxnet = call->rxnet; |
48c9e0ec | 634 | unsigned int debug_id = call->debug_id; |
a0575429 | 635 | bool dead; |
cb0fc0c9 | 636 | int r; |
17926a79 | 637 | |
e34d4234 | 638 | ASSERT(call != NULL); |
17926a79 | 639 | |
cb0fc0c9 DH |
640 | dead = __refcount_dec_and_test(&call->ref, &r); |
641 | trace_rxrpc_call(debug_id, r - 1, 0, why); | |
a0575429 | 642 | if (dead) { |
96b4059f | 643 | ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); |
17926a79 | 644 | |
2baec2c3 | 645 | if (!list_empty(&call->link)) { |
3dd9c8b5 | 646 | spin_lock(&rxnet->call_lock); |
2baec2c3 | 647 | list_del_init(&call->link); |
3dd9c8b5 | 648 | spin_unlock(&rxnet->call_lock); |
2baec2c3 | 649 | } |
e34d4234 | 650 | |
8d94aa38 | 651 | rxrpc_cleanup_call(call); |
17926a79 | 652 | } |
17926a79 DH |
653 | } |
654 | ||
dee46364 | 655 | /* |
3feda9d6 | 656 | * Free up the call under RCU. |
dee46364 | 657 | */ |
3feda9d6 | 658 | static void rxrpc_rcu_free_call(struct rcu_head *rcu) |
dee46364 | 659 | { |
3feda9d6 DH |
660 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); |
661 | struct rxrpc_net *rxnet = READ_ONCE(call->rxnet); | |
4a7f62f9 | 662 | |
dee46364 | 663 | kmem_cache_free(rxrpc_call_jar, call); |
d3be4d24 | 664 | if (atomic_dec_and_test(&rxnet->nr_calls)) |
5bb053be | 665 | wake_up_var(&rxnet->nr_calls); |
dee46364 DH |
666 | } |
667 | ||
963485d4 | 668 | /* |
3feda9d6 | 669 | * Final call destruction - but must be done in process context. |
963485d4 | 670 | */ |
3feda9d6 | 671 | static void rxrpc_destroy_call(struct work_struct *work) |
963485d4 | 672 | { |
3feda9d6 DH |
673 | struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer); |
674 | struct rxrpc_txbuf *txb; | |
963485d4 | 675 | |
3feda9d6 DH |
676 | del_timer_sync(&call->timer); |
677 | ||
41b7fa15 | 678 | rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack); |
3feda9d6 | 679 | rxrpc_cleanup_ring(call); |
cf37b598 DH |
680 | while ((txb = list_first_entry_or_null(&call->tx_sendmsg, |
681 | struct rxrpc_txbuf, call_link))) { | |
682 | list_del(&txb->call_link); | |
683 | rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); | |
684 | } | |
3feda9d6 DH |
685 | while ((txb = list_first_entry_or_null(&call->tx_buffer, |
686 | struct rxrpc_txbuf, call_link))) { | |
687 | list_del(&txb->call_link); | |
688 | rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); | |
963485d4 | 689 | } |
5e6ef4f1 | 690 | |
3feda9d6 | 691 | rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); |
3feda9d6 | 692 | rxrpc_put_connection(call->conn, rxrpc_conn_put_call); |
1bab27af DH |
693 | rxrpc_deactivate_bundle(call->bundle); |
694 | rxrpc_put_bundle(call->bundle, rxrpc_bundle_put_call); | |
3feda9d6 | 695 | rxrpc_put_peer(call->peer, rxrpc_peer_put_call); |
f3441d41 | 696 | rxrpc_put_local(call->local, rxrpc_local_put_call); |
3feda9d6 | 697 | call_rcu(&call->rcu, rxrpc_rcu_free_call); |
963485d4 DH |
698 | } |
699 | ||
17926a79 DH |
700 | /* |
701 | * clean up a call | |
702 | */ | |
00e90712 | 703 | void rxrpc_cleanup_call(struct rxrpc_call *call) |
17926a79 | 704 | { |
17926a79 DH |
705 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); |
706 | ||
96b4059f | 707 | ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); |
17926a79 | 708 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
17926a79 | 709 | |
5e6ef4f1 | 710 | del_timer(&call->timer); |
17926a79 | 711 | |
5e6ef4f1 | 712 | if (rcu_read_lock_held()) |
3feda9d6 DH |
713 | /* Can't use the rxrpc workqueue as we need to cancel/flush |
714 | * something that may be running/waiting there. | |
715 | */ | |
716 | schedule_work(&call->destroyer); | |
717 | else | |
718 | rxrpc_destroy_call(&call->destroyer); | |
17926a79 DH |
719 | } |
720 | ||
721 | /* | |
2baec2c3 DH |
722 | * Make sure that all calls are gone from a network namespace. To reach this |
723 | * point, any open UDP sockets in that namespace must have been closed, so any | |
724 | * outstanding calls cannot be doing I/O. | |
17926a79 | 725 | */ |
2baec2c3 | 726 | void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) |
17926a79 DH |
727 | { |
728 | struct rxrpc_call *call; | |
729 | ||
730 | _enter(""); | |
8d94aa38 | 731 | |
b1302342 | 732 | if (!list_empty(&rxnet->calls)) { |
3dd9c8b5 | 733 | spin_lock(&rxnet->call_lock); |
248f219c | 734 | |
b1302342 DH |
735 | while (!list_empty(&rxnet->calls)) { |
736 | call = list_entry(rxnet->calls.next, | |
737 | struct rxrpc_call, link); | |
738 | _debug("Zapping call %p", call); | |
17926a79 | 739 | |
cb0fc0c9 | 740 | rxrpc_see_call(call, rxrpc_call_see_zap); |
b1302342 | 741 | list_del_init(&call->link); |
17926a79 | 742 | |
b1302342 | 743 | pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", |
a0575429 | 744 | call, refcount_read(&call->ref), |
96b4059f | 745 | rxrpc_call_states[__rxrpc_call_state(call)], |
b1302342 | 746 | call->flags, call->events); |
17926a79 | 747 | |
3dd9c8b5 | 748 | spin_unlock(&rxnet->call_lock); |
b1302342 | 749 | cond_resched(); |
3dd9c8b5 | 750 | spin_lock(&rxnet->call_lock); |
b1302342 | 751 | } |
17926a79 | 752 | |
3dd9c8b5 | 753 | spin_unlock(&rxnet->call_lock); |
17926a79 DH |
754 | } |
755 | ||
d3be4d24 | 756 | atomic_dec(&rxnet->nr_calls); |
5bb053be | 757 | wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); |
17926a79 | 758 | } |