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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 | |
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)) { |
334dfbfc | 73 | trace_rxrpc_timer_expired(call, jiffies); |
5e6ef4f1 | 74 | rxrpc_poke_call(call, rxrpc_call_poke_timer); |
4a7f62f9 DH |
75 | } |
76 | } | |
77 | ||
78 | void rxrpc_reduce_call_timer(struct rxrpc_call *call, | |
79 | unsigned long expire_at, | |
80 | unsigned long now, | |
81 | enum rxrpc_timer_trace why) | |
82 | { | |
3feda9d6 DH |
83 | trace_rxrpc_timer(call, why, now); |
84 | timer_reduce(&call->timer, expire_at); | |
4a7f62f9 DH |
85 | } |
86 | ||
9faaff59 DH |
87 | static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; |
88 | ||
3feda9d6 DH |
89 | static void rxrpc_destroy_call(struct work_struct *); |
90 | ||
2341e077 DH |
91 | /* |
92 | * find an extant server call | |
93 | * - called in process context with IRQs enabled | |
94 | */ | |
95 | struct rxrpc_call *rxrpc_find_call_by_user_ID(struct rxrpc_sock *rx, | |
96 | unsigned long user_call_ID) | |
97 | { | |
98 | struct rxrpc_call *call; | |
99 | struct rb_node *p; | |
100 | ||
101 | _enter("%p,%lx", rx, user_call_ID); | |
102 | ||
103 | read_lock(&rx->call_lock); | |
104 | ||
105 | p = rx->calls.rb_node; | |
106 | while (p) { | |
107 | call = rb_entry(p, struct rxrpc_call, sock_node); | |
108 | ||
109 | if (user_call_ID < call->user_call_ID) | |
110 | p = p->rb_left; | |
111 | else if (user_call_ID > call->user_call_ID) | |
112 | p = p->rb_right; | |
113 | else | |
114 | goto found_extant_call; | |
115 | } | |
116 | ||
117 | read_unlock(&rx->call_lock); | |
118 | _leave(" = NULL"); | |
119 | return NULL; | |
120 | ||
121 | found_extant_call: | |
cb0fc0c9 | 122 | rxrpc_get_call(call, rxrpc_call_get_sendmsg); |
2341e077 | 123 | read_unlock(&rx->call_lock); |
a0575429 | 124 | _leave(" = %p [%d]", call, refcount_read(&call->ref)); |
2341e077 DH |
125 | return call; |
126 | } | |
127 | ||
17926a79 DH |
128 | /* |
129 | * allocate a new call | |
130 | */ | |
a25e21f0 DH |
131 | struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp, |
132 | unsigned int debug_id) | |
17926a79 DH |
133 | { |
134 | struct rxrpc_call *call; | |
d3be4d24 | 135 | struct rxrpc_net *rxnet = rxrpc_net(sock_net(&rx->sk)); |
17926a79 DH |
136 | |
137 | call = kmem_cache_zalloc(rxrpc_call_jar, gfp); | |
138 | if (!call) | |
139 | return NULL; | |
140 | ||
540b1c48 | 141 | mutex_init(&call->user_mutex); |
9faaff59 DH |
142 | |
143 | /* Prevent lockdep reporting a deadlock false positive between the afs | |
144 | * filesystem and sys_sendmsg() via the mmap sem. | |
145 | */ | |
146 | if (rx->sk.sk_kern_sock) | |
147 | lockdep_set_class(&call->user_mutex, | |
148 | &rxrpc_call_user_mutex_lock_class_key); | |
149 | ||
e99e88a9 | 150 | timer_setup(&call->timer, rxrpc_call_timer_expired, 0); |
3feda9d6 | 151 | INIT_WORK(&call->destroyer, rxrpc_destroy_call); |
999b69f8 | 152 | INIT_LIST_HEAD(&call->link); |
9d35d880 | 153 | INIT_LIST_HEAD(&call->wait_link); |
17926a79 | 154 | INIT_LIST_HEAD(&call->accept_link); |
248f219c DH |
155 | INIT_LIST_HEAD(&call->recvmsg_link); |
156 | INIT_LIST_HEAD(&call->sock_link); | |
15f661dc | 157 | INIT_LIST_HEAD(&call->attend_link); |
cf37b598 | 158 | INIT_LIST_HEAD(&call->tx_sendmsg); |
a4ea4c47 | 159 | INIT_LIST_HEAD(&call->tx_buffer); |
5d7edbc9 DH |
160 | skb_queue_head_init(&call->recvmsg_queue); |
161 | skb_queue_head_init(&call->rx_oos_queue); | |
45025bce | 162 | init_waitqueue_head(&call->waitq); |
20acbd9a | 163 | spin_lock_init(&call->notify_lock); |
a4ea4c47 | 164 | spin_lock_init(&call->tx_lock); |
a0575429 | 165 | refcount_set(&call->ref, 1); |
a25e21f0 | 166 | call->debug_id = debug_id; |
e754eba6 | 167 | call->tx_total_len = -1; |
a158bdd3 DH |
168 | call->next_rx_timo = 20 * HZ; |
169 | call->next_req_timo = 1 * HZ; | |
5bbf9533 DH |
170 | call->ackr_window = 1; |
171 | call->ackr_wtop = 1; | |
17926a79 DH |
172 | |
173 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
174 | ||
75e42126 | 175 | call->rx_winsize = rxrpc_rx_window_size; |
248f219c | 176 | call->tx_winsize = 16; |
57494343 | 177 | |
1fc4fa2a DH |
178 | if (RXRPC_TX_SMSS > 2190) |
179 | call->cong_cwnd = 2; | |
180 | else if (RXRPC_TX_SMSS > 1095) | |
181 | call->cong_cwnd = 3; | |
182 | else | |
183 | call->cong_cwnd = 4; | |
a4ea4c47 | 184 | call->cong_ssthresh = RXRPC_TX_MAX_WINDOW; |
d3be4d24 DH |
185 | |
186 | call->rxnet = rxnet; | |
4700c4d8 | 187 | call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; |
d3be4d24 | 188 | atomic_inc(&rxnet->nr_calls); |
17926a79 DH |
189 | return call; |
190 | } | |
191 | ||
192 | /* | |
999b69f8 | 193 | * Allocate a new client call. |
17926a79 | 194 | */ |
9faaff59 | 195 | static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
f3441d41 DH |
196 | struct rxrpc_conn_parameters *cp, |
197 | struct rxrpc_call_params *p, | |
a25e21f0 DH |
198 | gfp_t gfp, |
199 | unsigned int debug_id) | |
17926a79 DH |
200 | { |
201 | struct rxrpc_call *call; | |
57494343 | 202 | ktime_t now; |
f3441d41 | 203 | int ret; |
17926a79 DH |
204 | |
205 | _enter(""); | |
206 | ||
a25e21f0 | 207 | call = rxrpc_alloc_call(rx, gfp, debug_id); |
17926a79 DH |
208 | if (!call) |
209 | return ERR_PTR(-ENOMEM); | |
57494343 | 210 | now = ktime_get_real(); |
f3441d41 DH |
211 | call->acks_latest_ts = now; |
212 | call->cong_tstamp = now; | |
72904d7b DH |
213 | call->dest_srx = cp->peer->srx; |
214 | call->dest_srx.srx_service = cp->service_id; | |
f3441d41 DH |
215 | call->interruptibility = p->interruptibility; |
216 | call->tx_total_len = p->tx_total_len; | |
217 | call->key = key_get(cp->key); | |
72904d7b | 218 | call->peer = rxrpc_get_peer(cp->peer, rxrpc_peer_get_call); |
f3441d41 | 219 | call->local = rxrpc_get_local(cp->local, rxrpc_local_get_call); |
fdb99487 | 220 | call->security_level = cp->security_level; |
f3441d41 DH |
221 | if (p->kernel) |
222 | __set_bit(RXRPC_CALL_KERNEL, &call->flags); | |
223 | if (cp->upgrade) | |
224 | __set_bit(RXRPC_CALL_UPGRADE, &call->flags); | |
225 | if (cp->exclusive) | |
226 | __set_bit(RXRPC_CALL_EXCLUSIVE, &call->flags); | |
227 | ||
db099c62 DH |
228 | if (p->timeouts.normal) |
229 | call->next_rx_timo = min(msecs_to_jiffies(p->timeouts.normal), 1UL); | |
230 | if (p->timeouts.idle) | |
231 | call->next_req_timo = min(msecs_to_jiffies(p->timeouts.idle), 1UL); | |
232 | if (p->timeouts.hard) | |
233 | call->hard_timo = p->timeouts.hard * HZ; | |
234 | ||
f3441d41 DH |
235 | ret = rxrpc_init_client_call_security(call); |
236 | if (ret < 0) { | |
96b4059f | 237 | rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, ret); |
f3441d41 DH |
238 | rxrpc_put_call(call, rxrpc_call_put_discard_error); |
239 | return ERR_PTR(ret); | |
240 | } | |
241 | ||
96b4059f DH |
242 | rxrpc_set_call_state(call, RXRPC_CALL_CLIENT_AWAIT_CONN); |
243 | ||
f3441d41 DH |
244 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), |
245 | p->user_call_ID, rxrpc_call_new_client); | |
999b69f8 DH |
246 | |
247 | _leave(" = %p", call); | |
248 | return call; | |
249 | } | |
250 | ||
251 | /* | |
248f219c | 252 | * Initiate the call ack/resend/expiry timer. |
999b69f8 | 253 | */ |
9d35d880 | 254 | void rxrpc_start_call_timer(struct rxrpc_call *call) |
999b69f8 | 255 | { |
a158bdd3 DH |
256 | unsigned long now = jiffies; |
257 | unsigned long j = now + MAX_JIFFY_OFFSET; | |
258 | ||
530403d9 | 259 | call->delay_ack_at = j; |
bd1fdf8c | 260 | call->ack_lost_at = j; |
a158bdd3 DH |
261 | call->resend_at = j; |
262 | call->ping_at = j; | |
5e6ef4f1 | 263 | call->keepalive_at = j; |
a158bdd3 DH |
264 | call->expect_rx_by = j; |
265 | call->expect_req_by = j; | |
db099c62 | 266 | call->expect_term_by = j + call->hard_timo; |
a158bdd3 | 267 | call->timer.expires = now; |
17926a79 DH |
268 | } |
269 | ||
b7a7d674 DH |
270 | /* |
271 | * Wait for a call slot to become available. | |
272 | */ | |
273 | static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) | |
274 | { | |
275 | struct semaphore *limiter = &rxrpc_call_limiter; | |
276 | ||
277 | if (p->kernel) | |
278 | limiter = &rxrpc_kernel_call_limiter; | |
279 | if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { | |
280 | down(limiter); | |
281 | return limiter; | |
282 | } | |
283 | return down_interruptible(limiter) < 0 ? NULL : limiter; | |
284 | } | |
285 | ||
286 | /* | |
287 | * Release a call slot. | |
288 | */ | |
289 | static void rxrpc_put_call_slot(struct rxrpc_call *call) | |
290 | { | |
291 | struct semaphore *limiter = &rxrpc_call_limiter; | |
292 | ||
293 | if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) | |
294 | limiter = &rxrpc_kernel_call_limiter; | |
295 | up(limiter); | |
296 | } | |
297 | ||
9d35d880 DH |
298 | /* |
299 | * Start the process of connecting a call. We obtain a peer and a connection | |
300 | * bundle, but the actual association of a call with a connection is offloaded | |
301 | * to the I/O thread to simplify locking. | |
302 | */ | |
303 | static int rxrpc_connect_call(struct rxrpc_call *call, gfp_t gfp) | |
304 | { | |
305 | struct rxrpc_local *local = call->local; | |
01644a1f | 306 | int ret = -ENOMEM; |
9d35d880 DH |
307 | |
308 | _enter("{%d,%lx},", call->debug_id, call->user_call_ID); | |
309 | ||
9d35d880 DH |
310 | ret = rxrpc_look_up_bundle(call, gfp); |
311 | if (ret < 0) | |
312 | goto error; | |
313 | ||
314 | trace_rxrpc_client(NULL, -1, rxrpc_client_queue_new_call); | |
315 | rxrpc_get_call(call, rxrpc_call_get_io_thread); | |
316 | spin_lock(&local->client_call_lock); | |
317 | list_add_tail(&call->wait_link, &local->new_client_calls); | |
318 | spin_unlock(&local->client_call_lock); | |
319 | rxrpc_wake_up_io_thread(local); | |
320 | return 0; | |
321 | ||
322 | error: | |
323 | __set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); | |
324 | return ret; | |
325 | } | |
326 | ||
17926a79 | 327 | /* |
540b1c48 DH |
328 | * Set up a call for the given parameters. |
329 | * - Called with the socket lock held, which it must release. | |
330 | * - If it returns a call, the call's lock will need releasing by the caller. | |
17926a79 | 331 | */ |
2341e077 | 332 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
19ffa01c | 333 | struct rxrpc_conn_parameters *cp, |
48124178 | 334 | struct rxrpc_call_params *p, |
a25e21f0 DH |
335 | gfp_t gfp, |
336 | unsigned int debug_id) | |
540b1c48 | 337 | __releases(&rx->sk.sk_lock.slock) |
88f2a825 | 338 | __acquires(&call->user_mutex) |
17926a79 | 339 | { |
2341e077 | 340 | struct rxrpc_call *call, *xcall; |
d3be4d24 | 341 | struct rxrpc_net *rxnet; |
b7a7d674 | 342 | struct semaphore *limiter; |
2341e077 | 343 | struct rb_node *parent, **pp; |
999b69f8 | 344 | int ret; |
17926a79 | 345 | |
48124178 | 346 | _enter("%p,%lx", rx, p->user_call_ID); |
17926a79 | 347 | |
72904d7b DH |
348 | if (WARN_ON_ONCE(!cp->peer)) { |
349 | release_sock(&rx->sk); | |
350 | return ERR_PTR(-EIO); | |
351 | } | |
352 | ||
b7a7d674 | 353 | limiter = rxrpc_get_call_slot(p, gfp); |
b0f571ec DH |
354 | if (!limiter) { |
355 | release_sock(&rx->sk); | |
b7a7d674 | 356 | return ERR_PTR(-ERESTARTSYS); |
b0f571ec | 357 | } |
b7a7d674 | 358 | |
72904d7b | 359 | call = rxrpc_alloc_client_call(rx, cp, p, gfp, debug_id); |
2341e077 | 360 | if (IS_ERR(call)) { |
540b1c48 | 361 | release_sock(&rx->sk); |
b7a7d674 | 362 | up(limiter); |
2341e077 DH |
363 | _leave(" = %ld", PTR_ERR(call)); |
364 | return call; | |
17926a79 DH |
365 | } |
366 | ||
540b1c48 DH |
367 | /* We need to protect a partially set up call against the user as we |
368 | * will be acting outside the socket lock. | |
369 | */ | |
370 | mutex_lock(&call->user_mutex); | |
371 | ||
999b69f8 | 372 | /* Publish the call, even though it is incompletely set up as yet */ |
17926a79 DH |
373 | write_lock(&rx->call_lock); |
374 | ||
375 | pp = &rx->calls.rb_node; | |
376 | parent = NULL; | |
377 | while (*pp) { | |
378 | parent = *pp; | |
2341e077 | 379 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 380 | |
48124178 | 381 | if (p->user_call_ID < xcall->user_call_ID) |
17926a79 | 382 | pp = &(*pp)->rb_left; |
48124178 | 383 | else if (p->user_call_ID > xcall->user_call_ID) |
17926a79 DH |
384 | pp = &(*pp)->rb_right; |
385 | else | |
357f5ef6 | 386 | goto error_dup_user_ID; |
17926a79 DH |
387 | } |
388 | ||
248f219c | 389 | rcu_assign_pointer(call->socket, rx); |
48124178 | 390 | call->user_call_ID = p->user_call_ID; |
357f5ef6 | 391 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
cb0fc0c9 | 392 | rxrpc_get_call(call, rxrpc_call_get_userid); |
17926a79 DH |
393 | rb_link_node(&call->sock_node, parent, pp); |
394 | rb_insert_color(&call->sock_node, &rx->calls); | |
248f219c DH |
395 | list_add(&call->sock_link, &rx->sock_calls); |
396 | ||
17926a79 DH |
397 | write_unlock(&rx->call_lock); |
398 | ||
d3be4d24 | 399 | rxnet = call->rxnet; |
3dd9c8b5 | 400 | spin_lock(&rxnet->call_lock); |
ad25f5cb | 401 | list_add_tail_rcu(&call->link, &rxnet->calls); |
3dd9c8b5 | 402 | spin_unlock(&rxnet->call_lock); |
17926a79 | 403 | |
540b1c48 DH |
404 | /* From this point on, the call is protected by its own lock. */ |
405 | release_sock(&rx->sk); | |
406 | ||
248f219c DH |
407 | /* Set up or get a connection record and set the protocol parameters, |
408 | * including channel number and call ID. | |
409 | */ | |
1bab27af | 410 | ret = rxrpc_connect_call(call, gfp); |
999b69f8 | 411 | if (ret < 0) |
65550098 | 412 | goto error_attached_to_socket; |
999b69f8 | 413 | |
17926a79 DH |
414 | _leave(" = %p [new]", call); |
415 | return call; | |
416 | ||
2341e077 DH |
417 | /* We unexpectedly found the user ID in the list after taking |
418 | * the call_lock. This shouldn't happen unless the user races | |
419 | * with itself and tries to add the same user ID twice at the | |
420 | * same time in different threads. | |
421 | */ | |
357f5ef6 | 422 | error_dup_user_ID: |
17926a79 | 423 | write_unlock(&rx->call_lock); |
540b1c48 | 424 | release_sock(&rx->sk); |
96b4059f | 425 | rxrpc_prefail_call(call, RXRPC_CALL_LOCAL_ERROR, -EEXIST); |
cb0fc0c9 DH |
426 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), 0, |
427 | rxrpc_call_see_userid_exists); | |
540b1c48 | 428 | mutex_unlock(&call->user_mutex); |
cb0fc0c9 | 429 | rxrpc_put_call(call, rxrpc_call_put_userid_exists); |
65550098 DH |
430 | _leave(" = -EEXIST"); |
431 | return ERR_PTR(-EEXIST); | |
432 | ||
433 | /* We got an error, but the call is attached to the socket and is in | |
9d35d880 DH |
434 | * need of release. However, we might now race with recvmsg() when it |
435 | * completion notifies the socket. Return 0 from sys_sendmsg() and | |
65550098 DH |
436 | * leave the error to recvmsg() to deal with. |
437 | */ | |
438 | error_attached_to_socket: | |
cb0fc0c9 DH |
439 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), ret, |
440 | rxrpc_call_see_connect_failed); | |
9d35d880 | 441 | rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, 0, ret); |
65550098 DH |
442 | _leave(" = c=%08x [err]", call->debug_id); |
443 | return call; | |
17926a79 DH |
444 | } |
445 | ||
446 | /* | |
248f219c DH |
447 | * Set up an incoming call. call->conn points to the connection. |
448 | * This is called in BH context and isn't allowed to fail. | |
17926a79 | 449 | */ |
248f219c DH |
450 | void rxrpc_incoming_call(struct rxrpc_sock *rx, |
451 | struct rxrpc_call *call, | |
452 | struct sk_buff *skb) | |
17926a79 | 453 | { |
248f219c | 454 | struct rxrpc_connection *conn = call->conn; |
42886ffe | 455 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c | 456 | u32 chan; |
17926a79 | 457 | |
248f219c | 458 | _enter(",%d", call->conn->debug_id); |
e34d4234 | 459 | |
248f219c DH |
460 | rcu_assign_pointer(call->socket, rx); |
461 | call->call_id = sp->hdr.callNumber; | |
f3441d41 | 462 | call->dest_srx.srx_service = sp->hdr.serviceId; |
248f219c | 463 | call->cid = sp->hdr.cid; |
57494343 | 464 | call->cong_tstamp = skb->tstamp; |
248f219c | 465 | |
a343b174 | 466 | __set_bit(RXRPC_CALL_EXPOSED, &call->flags); |
96b4059f | 467 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); |
a343b174 | 468 | |
5e6ef4f1 DH |
469 | spin_lock(&conn->state_lock); |
470 | ||
471 | switch (conn->state) { | |
472 | case RXRPC_CONN_SERVICE_UNSECURED: | |
473 | case RXRPC_CONN_SERVICE_CHALLENGING: | |
96b4059f | 474 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_SECURING); |
5e6ef4f1 DH |
475 | break; |
476 | case RXRPC_CONN_SERVICE: | |
96b4059f | 477 | rxrpc_set_call_state(call, RXRPC_CALL_SERVER_RECV_REQUEST); |
5e6ef4f1 DH |
478 | break; |
479 | ||
a00ce28b | 480 | case RXRPC_CONN_ABORTED: |
96b4059f DH |
481 | rxrpc_set_call_completion(call, conn->completion, |
482 | conn->abort_code, conn->error); | |
5e6ef4f1 | 483 | break; |
5e6ef4f1 DH |
484 | default: |
485 | BUG(); | |
486 | } | |
487 | ||
5040011d DH |
488 | rxrpc_get_call(call, rxrpc_call_get_io_thread); |
489 | ||
248f219c DH |
490 | /* Set the channel for this call. We don't get channel_lock as we're |
491 | * only defending against the data_ready handler (which we're called | |
492 | * from) and the RESPONSE packet parser (which is only really | |
493 | * interested in call_counter and can cope with a disagreement with the | |
494 | * call pointer). | |
a1399f8b | 495 | */ |
248f219c DH |
496 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
497 | conn->channels[chan].call_counter = call->call_id; | |
498 | conn->channels[chan].call_id = call->call_id; | |
9d35d880 | 499 | conn->channels[chan].call = call; |
5e6ef4f1 | 500 | spin_unlock(&conn->state_lock); |
17926a79 | 501 | |
2cc80086 | 502 | spin_lock(&conn->peer->lock); |
29fb4ec3 | 503 | hlist_add_head(&call->error_link, &conn->peer->error_targets); |
2cc80086 | 504 | spin_unlock(&conn->peer->lock); |
17926a79 | 505 | |
248f219c DH |
506 | rxrpc_start_call_timer(call); |
507 | _leave(""); | |
17926a79 DH |
508 | } |
509 | ||
e34d4234 DH |
510 | /* |
511 | * Note the re-emergence of a call. | |
512 | */ | |
cb0fc0c9 | 513 | void rxrpc_see_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
e34d4234 | 514 | { |
e34d4234 | 515 | if (call) { |
cb0fc0c9 | 516 | int r = refcount_read(&call->ref); |
e34d4234 | 517 | |
cb0fc0c9 | 518 | trace_rxrpc_call(call->debug_id, r, 0, why); |
e34d4234 DH |
519 | } |
520 | } | |
521 | ||
5e6ef4f1 DH |
522 | struct rxrpc_call *rxrpc_try_get_call(struct rxrpc_call *call, |
523 | enum rxrpc_call_trace why) | |
4a7f62f9 | 524 | { |
cb0fc0c9 | 525 | int r; |
4a7f62f9 | 526 | |
5e6ef4f1 DH |
527 | if (!call || !__refcount_inc_not_zero(&call->ref, &r)) |
528 | return NULL; | |
cb0fc0c9 | 529 | trace_rxrpc_call(call->debug_id, r + 1, 0, why); |
5e6ef4f1 | 530 | return call; |
4a7f62f9 DH |
531 | } |
532 | ||
e34d4234 DH |
533 | /* |
534 | * Note the addition of a ref on a call. | |
535 | */ | |
cb0fc0c9 | 536 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
e34d4234 | 537 | { |
cb0fc0c9 | 538 | int r; |
e34d4234 | 539 | |
cb0fc0c9 DH |
540 | __refcount_inc(&call->ref, &r); |
541 | trace_rxrpc_call(call->debug_id, r + 1, 0, why); | |
e34d4234 DH |
542 | } |
543 | ||
a641fd00 | 544 | /* |
a4ea4c47 | 545 | * Clean up the Rx skb ring. |
a641fd00 DH |
546 | */ |
547 | static void rxrpc_cleanup_ring(struct rxrpc_call *call) | |
548 | { | |
4fc68c4c DH |
549 | rxrpc_purge_queue(&call->recvmsg_queue); |
550 | rxrpc_purge_queue(&call->rx_oos_queue); | |
a641fd00 DH |
551 | } |
552 | ||
e34d4234 | 553 | /* |
248f219c | 554 | * Detach a call from its owning socket. |
e34d4234 | 555 | */ |
248f219c | 556 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
e34d4234 | 557 | { |
248f219c | 558 | struct rxrpc_connection *conn = call->conn; |
9d35d880 | 559 | bool put = false, putu = false; |
e34d4234 | 560 | |
a0575429 | 561 | _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); |
e34d4234 | 562 | |
cb0fc0c9 DH |
563 | trace_rxrpc_call(call->debug_id, refcount_read(&call->ref), |
564 | call->flags, rxrpc_call_see_release); | |
17926a79 | 565 | |
17926a79 DH |
566 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) |
567 | BUG(); | |
17926a79 | 568 | |
b7a7d674 | 569 | rxrpc_put_call_slot(call); |
17926a79 | 570 | |
248f219c | 571 | /* Make sure we don't get any more notifications */ |
223f5901 | 572 | spin_lock(&rx->recvmsg_lock); |
e653cfe4 | 573 | |
248f219c | 574 | if (!list_empty(&call->recvmsg_link)) { |
17926a79 DH |
575 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
576 | call, call->events, call->flags); | |
248f219c DH |
577 | list_del(&call->recvmsg_link); |
578 | put = true; | |
579 | } | |
580 | ||
581 | /* list_empty() must return false in rxrpc_notify_socket() */ | |
582 | call->recvmsg_link.next = NULL; | |
583 | call->recvmsg_link.prev = NULL; | |
584 | ||
223f5901 | 585 | spin_unlock(&rx->recvmsg_lock); |
248f219c | 586 | if (put) |
cb0fc0c9 | 587 | rxrpc_put_call(call, rxrpc_call_put_unnotify); |
248f219c DH |
588 | |
589 | write_lock(&rx->call_lock); | |
590 | ||
591 | if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
17926a79 DH |
592 | rb_erase(&call->sock_node, &rx->calls); |
593 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
9d35d880 | 594 | putu = true; |
17926a79 | 595 | } |
17926a79 | 596 | |
248f219c DH |
597 | list_del(&call->sock_link); |
598 | write_unlock(&rx->call_lock); | |
599 | ||
600 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); | |
601 | ||
9d35d880 DH |
602 | if (putu) |
603 | rxrpc_put_call(call, rxrpc_call_put_userid); | |
604 | ||
17926a79 DH |
605 | _leave(""); |
606 | } | |
607 | ||
17926a79 DH |
608 | /* |
609 | * release all the calls associated with a socket | |
610 | */ | |
611 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
612 | { | |
613 | struct rxrpc_call *call; | |
17926a79 DH |
614 | |
615 | _enter("%p", rx); | |
616 | ||
0360da6d DH |
617 | while (!list_empty(&rx->to_be_accepted)) { |
618 | call = list_entry(rx->to_be_accepted.next, | |
619 | struct rxrpc_call, accept_link); | |
620 | list_del(&call->accept_link); | |
57af281e DH |
621 | rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, |
622 | rxrpc_abort_call_sock_release_tba); | |
cb0fc0c9 | 623 | rxrpc_put_call(call, rxrpc_call_put_release_sock_tba); |
0360da6d DH |
624 | } |
625 | ||
248f219c DH |
626 | while (!list_empty(&rx->sock_calls)) { |
627 | call = list_entry(rx->sock_calls.next, | |
628 | struct rxrpc_call, sock_link); | |
cb0fc0c9 | 629 | rxrpc_get_call(call, rxrpc_call_get_release_sock); |
57af281e DH |
630 | rxrpc_propose_abort(call, RX_CALL_DEAD, -ECONNRESET, |
631 | rxrpc_abort_call_sock_release); | |
8d94aa38 | 632 | rxrpc_release_call(rx, call); |
cb0fc0c9 | 633 | rxrpc_put_call(call, rxrpc_call_put_release_sock); |
f36b5e44 DH |
634 | } |
635 | ||
17926a79 DH |
636 | _leave(""); |
637 | } | |
638 | ||
639 | /* | |
640 | * release a call | |
641 | */ | |
cb0fc0c9 | 642 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace why) |
17926a79 | 643 | { |
d3be4d24 | 644 | struct rxrpc_net *rxnet = call->rxnet; |
48c9e0ec | 645 | unsigned int debug_id = call->debug_id; |
a0575429 | 646 | bool dead; |
cb0fc0c9 | 647 | int r; |
17926a79 | 648 | |
e34d4234 | 649 | ASSERT(call != NULL); |
17926a79 | 650 | |
cb0fc0c9 DH |
651 | dead = __refcount_dec_and_test(&call->ref, &r); |
652 | trace_rxrpc_call(debug_id, r - 1, 0, why); | |
a0575429 | 653 | if (dead) { |
96b4059f | 654 | ASSERTCMP(__rxrpc_call_state(call), ==, RXRPC_CALL_COMPLETE); |
17926a79 | 655 | |
2baec2c3 | 656 | if (!list_empty(&call->link)) { |
3dd9c8b5 | 657 | spin_lock(&rxnet->call_lock); |
2baec2c3 | 658 | list_del_init(&call->link); |
3dd9c8b5 | 659 | spin_unlock(&rxnet->call_lock); |
2baec2c3 | 660 | } |
e34d4234 | 661 | |
8d94aa38 | 662 | rxrpc_cleanup_call(call); |
17926a79 | 663 | } |
17926a79 DH |
664 | } |
665 | ||
dee46364 | 666 | /* |
3feda9d6 | 667 | * Free up the call under RCU. |
dee46364 | 668 | */ |
3feda9d6 | 669 | static void rxrpc_rcu_free_call(struct rcu_head *rcu) |
dee46364 | 670 | { |
3feda9d6 DH |
671 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); |
672 | struct rxrpc_net *rxnet = READ_ONCE(call->rxnet); | |
4a7f62f9 | 673 | |
dee46364 | 674 | kmem_cache_free(rxrpc_call_jar, call); |
d3be4d24 | 675 | if (atomic_dec_and_test(&rxnet->nr_calls)) |
5bb053be | 676 | wake_up_var(&rxnet->nr_calls); |
dee46364 DH |
677 | } |
678 | ||
963485d4 | 679 | /* |
3feda9d6 | 680 | * Final call destruction - but must be done in process context. |
963485d4 | 681 | */ |
3feda9d6 | 682 | static void rxrpc_destroy_call(struct work_struct *work) |
963485d4 | 683 | { |
3feda9d6 DH |
684 | struct rxrpc_call *call = container_of(work, struct rxrpc_call, destroyer); |
685 | struct rxrpc_txbuf *txb; | |
963485d4 | 686 | |
3feda9d6 DH |
687 | del_timer_sync(&call->timer); |
688 | ||
41b7fa15 | 689 | rxrpc_free_skb(call->cong_last_nack, rxrpc_skb_put_last_nack); |
3feda9d6 | 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 | } |