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 | ||
e99e88a9 | 48 | static void rxrpc_call_timer_expired(struct timer_list *t) |
248f219c | 49 | { |
e99e88a9 | 50 | struct rxrpc_call *call = from_timer(call, t, timer); |
248f219c DH |
51 | |
52 | _enter("%d", call->debug_id); | |
53 | ||
a158bdd3 | 54 | if (call->state < RXRPC_CALL_COMPLETE) { |
334dfbfc | 55 | trace_rxrpc_timer_expired(call, jiffies); |
4a7f62f9 DH |
56 | __rxrpc_queue_call(call); |
57 | } else { | |
58 | rxrpc_put_call(call, rxrpc_call_put); | |
59 | } | |
60 | } | |
61 | ||
62 | void rxrpc_reduce_call_timer(struct rxrpc_call *call, | |
63 | unsigned long expire_at, | |
64 | unsigned long now, | |
65 | enum rxrpc_timer_trace why) | |
66 | { | |
67 | if (rxrpc_try_get_call(call, rxrpc_call_got_timer)) { | |
68 | trace_rxrpc_timer(call, why, now); | |
69 | if (timer_reduce(&call->timer, expire_at)) | |
70 | rxrpc_put_call(call, rxrpc_call_put_notimer); | |
a158bdd3 | 71 | } |
248f219c | 72 | } |
17926a79 | 73 | |
4a7f62f9 DH |
74 | void rxrpc_delete_call_timer(struct rxrpc_call *call) |
75 | { | |
76 | if (del_timer_sync(&call->timer)) | |
77 | rxrpc_put_call(call, rxrpc_call_put_timer); | |
78 | } | |
79 | ||
9faaff59 DH |
80 | static struct lock_class_key rxrpc_call_user_mutex_lock_class_key; |
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: | |
fff72429 | 113 | rxrpc_get_call(call, rxrpc_call_got); |
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); |
17926a79 | 142 | INIT_WORK(&call->processor, &rxrpc_process_call); |
999b69f8 | 143 | INIT_LIST_HEAD(&call->link); |
45025bce | 144 | INIT_LIST_HEAD(&call->chan_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); | |
a4ea4c47 | 148 | INIT_LIST_HEAD(&call->tx_buffer); |
5d7edbc9 DH |
149 | skb_queue_head_init(&call->recvmsg_queue); |
150 | skb_queue_head_init(&call->rx_oos_queue); | |
45025bce | 151 | init_waitqueue_head(&call->waitq); |
20acbd9a | 152 | spin_lock_init(&call->notify_lock); |
a4ea4c47 | 153 | spin_lock_init(&call->tx_lock); |
c1e15b49 | 154 | spin_lock_init(&call->input_lock); |
d57a3a15 | 155 | spin_lock_init(&call->acks_ack_lock); |
17926a79 | 156 | rwlock_init(&call->state_lock); |
a0575429 | 157 | refcount_set(&call->ref, 1); |
a25e21f0 | 158 | call->debug_id = debug_id; |
e754eba6 | 159 | call->tx_total_len = -1; |
a158bdd3 DH |
160 | call->next_rx_timo = 20 * HZ; |
161 | call->next_req_timo = 1 * HZ; | |
5d7edbc9 | 162 | atomic64_set(&call->ackr_window, 0x100000001ULL); |
17926a79 DH |
163 | |
164 | memset(&call->sock_node, 0xed, sizeof(call->sock_node)); | |
165 | ||
75e42126 | 166 | call->rx_winsize = rxrpc_rx_window_size; |
248f219c | 167 | call->tx_winsize = 16; |
57494343 | 168 | |
1fc4fa2a DH |
169 | if (RXRPC_TX_SMSS > 2190) |
170 | call->cong_cwnd = 2; | |
171 | else if (RXRPC_TX_SMSS > 1095) | |
172 | call->cong_cwnd = 3; | |
173 | else | |
174 | call->cong_cwnd = 4; | |
a4ea4c47 | 175 | call->cong_ssthresh = RXRPC_TX_MAX_WINDOW; |
d3be4d24 DH |
176 | |
177 | call->rxnet = rxnet; | |
4700c4d8 | 178 | call->rtt_avail = RXRPC_CALL_RTT_AVAIL_MASK; |
d3be4d24 | 179 | atomic_inc(&rxnet->nr_calls); |
17926a79 DH |
180 | return call; |
181 | } | |
182 | ||
183 | /* | |
999b69f8 | 184 | * Allocate a new client call. |
17926a79 | 185 | */ |
9faaff59 DH |
186 | static struct rxrpc_call *rxrpc_alloc_client_call(struct rxrpc_sock *rx, |
187 | struct sockaddr_rxrpc *srx, | |
a25e21f0 DH |
188 | gfp_t gfp, |
189 | unsigned int debug_id) | |
17926a79 DH |
190 | { |
191 | struct rxrpc_call *call; | |
57494343 | 192 | ktime_t now; |
17926a79 DH |
193 | |
194 | _enter(""); | |
195 | ||
a25e21f0 | 196 | call = rxrpc_alloc_call(rx, gfp, debug_id); |
17926a79 DH |
197 | if (!call) |
198 | return ERR_PTR(-ENOMEM); | |
999b69f8 | 199 | call->state = RXRPC_CALL_CLIENT_AWAIT_CONN; |
999b69f8 | 200 | call->service_id = srx->srx_service; |
57494343 DH |
201 | now = ktime_get_real(); |
202 | call->acks_latest_ts = now; | |
203 | call->cong_tstamp = now; | |
999b69f8 DH |
204 | |
205 | _leave(" = %p", call); | |
206 | return call; | |
207 | } | |
208 | ||
209 | /* | |
248f219c | 210 | * Initiate the call ack/resend/expiry timer. |
999b69f8 | 211 | */ |
248f219c | 212 | static void rxrpc_start_call_timer(struct rxrpc_call *call) |
999b69f8 | 213 | { |
a158bdd3 DH |
214 | unsigned long now = jiffies; |
215 | unsigned long j = now + MAX_JIFFY_OFFSET; | |
216 | ||
530403d9 | 217 | call->delay_ack_at = j; |
bd1fdf8c | 218 | call->ack_lost_at = j; |
a158bdd3 DH |
219 | call->resend_at = j; |
220 | call->ping_at = j; | |
221 | call->expect_rx_by = j; | |
222 | call->expect_req_by = j; | |
223 | call->expect_term_by = j; | |
224 | call->timer.expires = now; | |
17926a79 DH |
225 | } |
226 | ||
b7a7d674 DH |
227 | /* |
228 | * Wait for a call slot to become available. | |
229 | */ | |
230 | static struct semaphore *rxrpc_get_call_slot(struct rxrpc_call_params *p, gfp_t gfp) | |
231 | { | |
232 | struct semaphore *limiter = &rxrpc_call_limiter; | |
233 | ||
234 | if (p->kernel) | |
235 | limiter = &rxrpc_kernel_call_limiter; | |
236 | if (p->interruptibility == RXRPC_UNINTERRUPTIBLE) { | |
237 | down(limiter); | |
238 | return limiter; | |
239 | } | |
240 | return down_interruptible(limiter) < 0 ? NULL : limiter; | |
241 | } | |
242 | ||
243 | /* | |
244 | * Release a call slot. | |
245 | */ | |
246 | static void rxrpc_put_call_slot(struct rxrpc_call *call) | |
247 | { | |
248 | struct semaphore *limiter = &rxrpc_call_limiter; | |
249 | ||
250 | if (test_bit(RXRPC_CALL_KERNEL, &call->flags)) | |
251 | limiter = &rxrpc_kernel_call_limiter; | |
252 | up(limiter); | |
253 | } | |
254 | ||
17926a79 | 255 | /* |
540b1c48 DH |
256 | * Set up a call for the given parameters. |
257 | * - Called with the socket lock held, which it must release. | |
258 | * - If it returns a call, the call's lock will need releasing by the caller. | |
17926a79 | 259 | */ |
2341e077 | 260 | struct rxrpc_call *rxrpc_new_client_call(struct rxrpc_sock *rx, |
19ffa01c | 261 | struct rxrpc_conn_parameters *cp, |
999b69f8 | 262 | struct sockaddr_rxrpc *srx, |
48124178 | 263 | struct rxrpc_call_params *p, |
a25e21f0 DH |
264 | gfp_t gfp, |
265 | unsigned int debug_id) | |
540b1c48 | 266 | __releases(&rx->sk.sk_lock.slock) |
88f2a825 | 267 | __acquires(&call->user_mutex) |
17926a79 | 268 | { |
2341e077 | 269 | struct rxrpc_call *call, *xcall; |
d3be4d24 | 270 | struct rxrpc_net *rxnet; |
b7a7d674 | 271 | struct semaphore *limiter; |
2341e077 | 272 | struct rb_node *parent, **pp; |
e34d4234 | 273 | const void *here = __builtin_return_address(0); |
999b69f8 | 274 | int ret; |
17926a79 | 275 | |
48124178 | 276 | _enter("%p,%lx", rx, p->user_call_ID); |
17926a79 | 277 | |
b7a7d674 | 278 | limiter = rxrpc_get_call_slot(p, gfp); |
b0f571ec DH |
279 | if (!limiter) { |
280 | release_sock(&rx->sk); | |
b7a7d674 | 281 | return ERR_PTR(-ERESTARTSYS); |
b0f571ec | 282 | } |
b7a7d674 | 283 | |
a25e21f0 | 284 | call = rxrpc_alloc_client_call(rx, srx, gfp, debug_id); |
2341e077 | 285 | if (IS_ERR(call)) { |
540b1c48 | 286 | release_sock(&rx->sk); |
b7a7d674 | 287 | up(limiter); |
2341e077 DH |
288 | _leave(" = %ld", PTR_ERR(call)); |
289 | return call; | |
17926a79 DH |
290 | } |
291 | ||
e138aa7d | 292 | call->interruptibility = p->interruptibility; |
48124178 | 293 | call->tx_total_len = p->tx_total_len; |
48c9e0ec | 294 | trace_rxrpc_call(call->debug_id, rxrpc_call_new_client, |
a0575429 | 295 | refcount_read(&call->ref), |
48124178 | 296 | here, (const void *)p->user_call_ID); |
b7a7d674 DH |
297 | if (p->kernel) |
298 | __set_bit(RXRPC_CALL_KERNEL, &call->flags); | |
e34d4234 | 299 | |
540b1c48 DH |
300 | /* We need to protect a partially set up call against the user as we |
301 | * will be acting outside the socket lock. | |
302 | */ | |
303 | mutex_lock(&call->user_mutex); | |
304 | ||
999b69f8 | 305 | /* Publish the call, even though it is incompletely set up as yet */ |
17926a79 DH |
306 | write_lock(&rx->call_lock); |
307 | ||
308 | pp = &rx->calls.rb_node; | |
309 | parent = NULL; | |
310 | while (*pp) { | |
311 | parent = *pp; | |
2341e077 | 312 | xcall = rb_entry(parent, struct rxrpc_call, sock_node); |
17926a79 | 313 | |
48124178 | 314 | if (p->user_call_ID < xcall->user_call_ID) |
17926a79 | 315 | pp = &(*pp)->rb_left; |
48124178 | 316 | else if (p->user_call_ID > xcall->user_call_ID) |
17926a79 DH |
317 | pp = &(*pp)->rb_right; |
318 | else | |
357f5ef6 | 319 | goto error_dup_user_ID; |
17926a79 DH |
320 | } |
321 | ||
248f219c | 322 | rcu_assign_pointer(call->socket, rx); |
48124178 | 323 | call->user_call_ID = p->user_call_ID; |
357f5ef6 | 324 | __set_bit(RXRPC_CALL_HAS_USERID, &call->flags); |
fff72429 | 325 | rxrpc_get_call(call, rxrpc_call_got_userid); |
17926a79 DH |
326 | rb_link_node(&call->sock_node, parent, pp); |
327 | rb_insert_color(&call->sock_node, &rx->calls); | |
248f219c DH |
328 | list_add(&call->sock_link, &rx->sock_calls); |
329 | ||
17926a79 DH |
330 | write_unlock(&rx->call_lock); |
331 | ||
d3be4d24 | 332 | rxnet = call->rxnet; |
ad25f5cb DH |
333 | spin_lock_bh(&rxnet->call_lock); |
334 | list_add_tail_rcu(&call->link, &rxnet->calls); | |
335 | spin_unlock_bh(&rxnet->call_lock); | |
17926a79 | 336 | |
540b1c48 DH |
337 | /* From this point on, the call is protected by its own lock. */ |
338 | release_sock(&rx->sk); | |
339 | ||
248f219c DH |
340 | /* Set up or get a connection record and set the protocol parameters, |
341 | * including channel number and call ID. | |
342 | */ | |
5e33a23b | 343 | ret = rxrpc_connect_call(rx, call, cp, srx, gfp); |
999b69f8 | 344 | if (ret < 0) |
65550098 | 345 | goto error_attached_to_socket; |
999b69f8 | 346 | |
48c9e0ec | 347 | trace_rxrpc_call(call->debug_id, rxrpc_call_connected, |
a0575429 | 348 | refcount_read(&call->ref), here, NULL); |
a84a46d7 | 349 | |
248f219c DH |
350 | rxrpc_start_call_timer(call); |
351 | ||
17926a79 DH |
352 | _leave(" = %p [new]", call); |
353 | return call; | |
354 | ||
2341e077 DH |
355 | /* We unexpectedly found the user ID in the list after taking |
356 | * the call_lock. This shouldn't happen unless the user races | |
357 | * with itself and tries to add the same user ID twice at the | |
358 | * same time in different threads. | |
359 | */ | |
357f5ef6 | 360 | error_dup_user_ID: |
17926a79 | 361 | write_unlock(&rx->call_lock); |
540b1c48 | 362 | release_sock(&rx->sk); |
357f5ef6 | 363 | __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, |
65550098 | 364 | RX_CALL_DEAD, -EEXIST); |
48c9e0ec | 365 | trace_rxrpc_call(call->debug_id, rxrpc_call_error, |
a0575429 | 366 | refcount_read(&call->ref), here, ERR_PTR(-EEXIST)); |
357f5ef6 | 367 | rxrpc_release_call(rx, call); |
540b1c48 | 368 | mutex_unlock(&call->user_mutex); |
357f5ef6 | 369 | rxrpc_put_call(call, rxrpc_call_put); |
65550098 DH |
370 | _leave(" = -EEXIST"); |
371 | return ERR_PTR(-EEXIST); | |
372 | ||
373 | /* We got an error, but the call is attached to the socket and is in | |
374 | * need of release. However, we might now race with recvmsg() when | |
375 | * completing the call queues it. Return 0 from sys_sendmsg() and | |
376 | * leave the error to recvmsg() to deal with. | |
377 | */ | |
378 | error_attached_to_socket: | |
379 | trace_rxrpc_call(call->debug_id, rxrpc_call_error, | |
a0575429 | 380 | refcount_read(&call->ref), here, ERR_PTR(ret)); |
65550098 DH |
381 | set_bit(RXRPC_CALL_DISCONNECTED, &call->flags); |
382 | __rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, | |
383 | RX_CALL_DEAD, ret); | |
384 | _leave(" = c=%08x [err]", call->debug_id); | |
385 | return call; | |
17926a79 DH |
386 | } |
387 | ||
388 | /* | |
248f219c DH |
389 | * Set up an incoming call. call->conn points to the connection. |
390 | * This is called in BH context and isn't allowed to fail. | |
17926a79 | 391 | */ |
248f219c DH |
392 | void rxrpc_incoming_call(struct rxrpc_sock *rx, |
393 | struct rxrpc_call *call, | |
394 | struct sk_buff *skb) | |
17926a79 | 395 | { |
248f219c | 396 | struct rxrpc_connection *conn = call->conn; |
42886ffe | 397 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
248f219c | 398 | u32 chan; |
17926a79 | 399 | |
248f219c | 400 | _enter(",%d", call->conn->debug_id); |
e34d4234 | 401 | |
248f219c DH |
402 | rcu_assign_pointer(call->socket, rx); |
403 | call->call_id = sp->hdr.callNumber; | |
404 | call->service_id = sp->hdr.serviceId; | |
405 | call->cid = sp->hdr.cid; | |
2d914c1b | 406 | call->state = RXRPC_CALL_SERVER_SECURING; |
57494343 | 407 | call->cong_tstamp = skb->tstamp; |
248f219c DH |
408 | |
409 | /* Set the channel for this call. We don't get channel_lock as we're | |
410 | * only defending against the data_ready handler (which we're called | |
411 | * from) and the RESPONSE packet parser (which is only really | |
412 | * interested in call_counter and can cope with a disagreement with the | |
413 | * call pointer). | |
a1399f8b | 414 | */ |
248f219c DH |
415 | chan = sp->hdr.cid & RXRPC_CHANNELMASK; |
416 | conn->channels[chan].call_counter = call->call_id; | |
417 | conn->channels[chan].call_id = call->call_id; | |
a1399f8b | 418 | rcu_assign_pointer(conn->channels[chan].call, call); |
17926a79 | 419 | |
2cc80086 DH |
420 | spin_lock(&conn->peer->lock); |
421 | hlist_add_head_rcu(&call->error_link, &conn->peer->error_targets); | |
422 | spin_unlock(&conn->peer->lock); | |
17926a79 | 423 | |
248f219c DH |
424 | rxrpc_start_call_timer(call); |
425 | _leave(""); | |
17926a79 DH |
426 | } |
427 | ||
8d94aa38 DH |
428 | /* |
429 | * Queue a call's work processor, getting a ref to pass to the work queue. | |
430 | */ | |
431 | bool rxrpc_queue_call(struct rxrpc_call *call) | |
432 | { | |
433 | const void *here = __builtin_return_address(0); | |
a0575429 DH |
434 | int n; |
435 | ||
436 | if (!__refcount_inc_not_zero(&call->ref, &n)) | |
8d94aa38 DH |
437 | return false; |
438 | if (rxrpc_queue_work(&call->processor)) | |
48c9e0ec DH |
439 | trace_rxrpc_call(call->debug_id, rxrpc_call_queued, n + 1, |
440 | here, NULL); | |
8d94aa38 DH |
441 | else |
442 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
443 | return true; | |
444 | } | |
445 | ||
446 | /* | |
447 | * Queue a call's work processor, passing the callers ref to the work queue. | |
448 | */ | |
449 | bool __rxrpc_queue_call(struct rxrpc_call *call) | |
450 | { | |
451 | const void *here = __builtin_return_address(0); | |
a0575429 | 452 | int n = refcount_read(&call->ref); |
8d94aa38 DH |
453 | ASSERTCMP(n, >=, 1); |
454 | if (rxrpc_queue_work(&call->processor)) | |
48c9e0ec DH |
455 | trace_rxrpc_call(call->debug_id, rxrpc_call_queued_ref, n, |
456 | here, NULL); | |
8d94aa38 DH |
457 | else |
458 | rxrpc_put_call(call, rxrpc_call_put_noqueue); | |
459 | return true; | |
460 | } | |
461 | ||
e34d4234 DH |
462 | /* |
463 | * Note the re-emergence of a call. | |
464 | */ | |
465 | void rxrpc_see_call(struct rxrpc_call *call) | |
466 | { | |
467 | const void *here = __builtin_return_address(0); | |
468 | if (call) { | |
a0575429 | 469 | int n = refcount_read(&call->ref); |
e34d4234 | 470 | |
48c9e0ec DH |
471 | trace_rxrpc_call(call->debug_id, rxrpc_call_seen, n, |
472 | here, NULL); | |
e34d4234 DH |
473 | } |
474 | } | |
475 | ||
4a7f62f9 DH |
476 | bool rxrpc_try_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
477 | { | |
478 | const void *here = __builtin_return_address(0); | |
a0575429 | 479 | int n; |
4a7f62f9 | 480 | |
a0575429 | 481 | if (!__refcount_inc_not_zero(&call->ref, &n)) |
4a7f62f9 | 482 | return false; |
a0575429 | 483 | trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL); |
4a7f62f9 DH |
484 | return true; |
485 | } | |
486 | ||
e34d4234 DH |
487 | /* |
488 | * Note the addition of a ref on a call. | |
489 | */ | |
fff72429 | 490 | void rxrpc_get_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
e34d4234 DH |
491 | { |
492 | const void *here = __builtin_return_address(0); | |
a0575429 | 493 | int n; |
e34d4234 | 494 | |
a0575429 DH |
495 | __refcount_inc(&call->ref, &n); |
496 | trace_rxrpc_call(call->debug_id, op, n + 1, here, NULL); | |
e34d4234 DH |
497 | } |
498 | ||
a641fd00 | 499 | /* |
a4ea4c47 | 500 | * Clean up the Rx skb ring. |
a641fd00 DH |
501 | */ |
502 | static void rxrpc_cleanup_ring(struct rxrpc_call *call) | |
503 | { | |
5d7edbc9 DH |
504 | skb_queue_purge(&call->recvmsg_queue); |
505 | skb_queue_purge(&call->rx_oos_queue); | |
a641fd00 DH |
506 | } |
507 | ||
e34d4234 | 508 | /* |
248f219c | 509 | * Detach a call from its owning socket. |
e34d4234 | 510 | */ |
248f219c | 511 | void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call) |
e34d4234 | 512 | { |
a84a46d7 | 513 | const void *here = __builtin_return_address(0); |
248f219c DH |
514 | struct rxrpc_connection *conn = call->conn; |
515 | bool put = false; | |
e34d4234 | 516 | |
a0575429 | 517 | _enter("{%d,%d}", call->debug_id, refcount_read(&call->ref)); |
e34d4234 | 518 | |
48c9e0ec | 519 | trace_rxrpc_call(call->debug_id, rxrpc_call_release, |
a0575429 | 520 | refcount_read(&call->ref), |
a84a46d7 | 521 | here, (const void *)call->flags); |
17926a79 | 522 | |
a84a46d7 | 523 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
e34d4234 | 524 | |
17926a79 DH |
525 | if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags)) |
526 | BUG(); | |
17926a79 | 527 | |
b7a7d674 | 528 | rxrpc_put_call_slot(call); |
4a7f62f9 | 529 | rxrpc_delete_call_timer(call); |
17926a79 | 530 | |
248f219c DH |
531 | /* Make sure we don't get any more notifications */ |
532 | write_lock_bh(&rx->recvmsg_lock); | |
e653cfe4 | 533 | |
248f219c | 534 | if (!list_empty(&call->recvmsg_link)) { |
17926a79 DH |
535 | _debug("unlinking once-pending call %p { e=%lx f=%lx }", |
536 | call, call->events, call->flags); | |
248f219c DH |
537 | list_del(&call->recvmsg_link); |
538 | put = true; | |
539 | } | |
540 | ||
541 | /* list_empty() must return false in rxrpc_notify_socket() */ | |
542 | call->recvmsg_link.next = NULL; | |
543 | call->recvmsg_link.prev = NULL; | |
544 | ||
545 | write_unlock_bh(&rx->recvmsg_lock); | |
546 | if (put) | |
547 | rxrpc_put_call(call, rxrpc_call_put); | |
548 | ||
549 | write_lock(&rx->call_lock); | |
550 | ||
551 | if (test_and_clear_bit(RXRPC_CALL_HAS_USERID, &call->flags)) { | |
17926a79 DH |
552 | rb_erase(&call->sock_node, &rx->calls); |
553 | memset(&call->sock_node, 0xdd, sizeof(call->sock_node)); | |
8d94aa38 | 554 | rxrpc_put_call(call, rxrpc_call_put_userid); |
17926a79 | 555 | } |
17926a79 | 556 | |
248f219c DH |
557 | list_del(&call->sock_link); |
558 | write_unlock(&rx->call_lock); | |
559 | ||
560 | _debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn); | |
561 | ||
5273a191 | 562 | if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
8d94aa38 | 563 | rxrpc_disconnect_call(call); |
91fcfbe8 DH |
564 | if (call->security) |
565 | call->security->free_call_crypto(call); | |
17926a79 DH |
566 | _leave(""); |
567 | } | |
568 | ||
17926a79 DH |
569 | /* |
570 | * release all the calls associated with a socket | |
571 | */ | |
572 | void rxrpc_release_calls_on_socket(struct rxrpc_sock *rx) | |
573 | { | |
574 | struct rxrpc_call *call; | |
17926a79 DH |
575 | |
576 | _enter("%p", rx); | |
577 | ||
0360da6d DH |
578 | while (!list_empty(&rx->to_be_accepted)) { |
579 | call = list_entry(rx->to_be_accepted.next, | |
580 | struct rxrpc_call, accept_link); | |
581 | list_del(&call->accept_link); | |
3a92789a | 582 | rxrpc_abort_call("SKR", call, 0, RX_CALL_DEAD, -ECONNRESET); |
0360da6d DH |
583 | rxrpc_put_call(call, rxrpc_call_put); |
584 | } | |
585 | ||
248f219c DH |
586 | while (!list_empty(&rx->sock_calls)) { |
587 | call = list_entry(rx->sock_calls.next, | |
588 | struct rxrpc_call, sock_link); | |
589 | rxrpc_get_call(call, rxrpc_call_got); | |
3a92789a | 590 | rxrpc_abort_call("SKT", call, 0, RX_CALL_DEAD, -ECONNRESET); |
26cb02aa | 591 | rxrpc_send_abort_packet(call); |
8d94aa38 | 592 | rxrpc_release_call(rx, call); |
248f219c | 593 | rxrpc_put_call(call, rxrpc_call_put); |
f36b5e44 DH |
594 | } |
595 | ||
17926a79 DH |
596 | _leave(""); |
597 | } | |
598 | ||
599 | /* | |
600 | * release a call | |
601 | */ | |
fff72429 | 602 | void rxrpc_put_call(struct rxrpc_call *call, enum rxrpc_call_trace op) |
17926a79 | 603 | { |
d3be4d24 | 604 | struct rxrpc_net *rxnet = call->rxnet; |
e34d4234 | 605 | const void *here = __builtin_return_address(0); |
48c9e0ec | 606 | unsigned int debug_id = call->debug_id; |
a0575429 | 607 | bool dead; |
2ab27215 | 608 | int n; |
17926a79 | 609 | |
e34d4234 | 610 | ASSERT(call != NULL); |
17926a79 | 611 | |
a0575429 | 612 | dead = __refcount_dec_and_test(&call->ref, &n); |
48c9e0ec | 613 | trace_rxrpc_call(debug_id, op, n, here, NULL); |
a0575429 | 614 | if (dead) { |
e34d4234 | 615 | _debug("call %d dead", call->debug_id); |
248f219c | 616 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 617 | |
2baec2c3 | 618 | if (!list_empty(&call->link)) { |
ad25f5cb | 619 | spin_lock_bh(&rxnet->call_lock); |
2baec2c3 | 620 | list_del_init(&call->link); |
ad25f5cb | 621 | spin_unlock_bh(&rxnet->call_lock); |
2baec2c3 | 622 | } |
e34d4234 | 623 | |
8d94aa38 | 624 | rxrpc_cleanup_call(call); |
17926a79 | 625 | } |
17926a79 DH |
626 | } |
627 | ||
dee46364 | 628 | /* |
963485d4 | 629 | * Final call destruction - but must be done in process context. |
dee46364 | 630 | */ |
963485d4 | 631 | static void rxrpc_destroy_call(struct work_struct *work) |
dee46364 | 632 | { |
963485d4 | 633 | struct rxrpc_call *call = container_of(work, struct rxrpc_call, processor); |
d3be4d24 | 634 | struct rxrpc_net *rxnet = call->rxnet; |
dee46364 | 635 | |
4a7f62f9 DH |
636 | rxrpc_delete_call_timer(call); |
637 | ||
7fa25105 | 638 | rxrpc_put_connection(call->conn, rxrpc_conn_put_call); |
47c810a7 | 639 | rxrpc_put_peer(call->peer, rxrpc_peer_put_call); |
dee46364 | 640 | kmem_cache_free(rxrpc_call_jar, call); |
d3be4d24 | 641 | if (atomic_dec_and_test(&rxnet->nr_calls)) |
5bb053be | 642 | wake_up_var(&rxnet->nr_calls); |
dee46364 DH |
643 | } |
644 | ||
963485d4 DH |
645 | /* |
646 | * Final call destruction under RCU. | |
647 | */ | |
648 | static void rxrpc_rcu_destroy_call(struct rcu_head *rcu) | |
649 | { | |
650 | struct rxrpc_call *call = container_of(rcu, struct rxrpc_call, rcu); | |
651 | ||
652 | if (in_softirq()) { | |
653 | INIT_WORK(&call->processor, rxrpc_destroy_call); | |
654 | if (!rxrpc_queue_work(&call->processor)) | |
655 | BUG(); | |
656 | } else { | |
657 | rxrpc_destroy_call(&call->processor); | |
658 | } | |
659 | } | |
660 | ||
17926a79 DH |
661 | /* |
662 | * clean up a call | |
663 | */ | |
00e90712 | 664 | void rxrpc_cleanup_call(struct rxrpc_call *call) |
17926a79 | 665 | { |
a4ea4c47 DH |
666 | struct rxrpc_txbuf *txb; |
667 | ||
17926a79 DH |
668 | memset(&call->sock_node, 0xcd, sizeof(call->sock_node)); |
669 | ||
8d94aa38 | 670 | ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE); |
17926a79 | 671 | ASSERT(test_bit(RXRPC_CALL_RELEASED, &call->flags)); |
17926a79 | 672 | |
a641fd00 | 673 | rxrpc_cleanup_ring(call); |
a4ea4c47 DH |
674 | while ((txb = list_first_entry_or_null(&call->tx_buffer, |
675 | struct rxrpc_txbuf, call_link))) { | |
676 | list_del(&txb->call_link); | |
677 | rxrpc_put_txbuf(txb, rxrpc_txbuf_put_cleaned); | |
678 | } | |
679 | rxrpc_put_txbuf(call->tx_pending, rxrpc_txbuf_put_cleaned); | |
d57a3a15 | 680 | rxrpc_free_skb(call->acks_soft_tbl, rxrpc_skb_cleaned); |
17926a79 | 681 | |
dee46364 | 682 | call_rcu(&call->rcu, rxrpc_rcu_destroy_call); |
17926a79 DH |
683 | } |
684 | ||
685 | /* | |
2baec2c3 DH |
686 | * Make sure that all calls are gone from a network namespace. To reach this |
687 | * point, any open UDP sockets in that namespace must have been closed, so any | |
688 | * outstanding calls cannot be doing I/O. | |
17926a79 | 689 | */ |
2baec2c3 | 690 | void rxrpc_destroy_all_calls(struct rxrpc_net *rxnet) |
17926a79 DH |
691 | { |
692 | struct rxrpc_call *call; | |
693 | ||
694 | _enter(""); | |
8d94aa38 | 695 | |
b1302342 | 696 | if (!list_empty(&rxnet->calls)) { |
ad25f5cb | 697 | spin_lock_bh(&rxnet->call_lock); |
248f219c | 698 | |
b1302342 DH |
699 | while (!list_empty(&rxnet->calls)) { |
700 | call = list_entry(rxnet->calls.next, | |
701 | struct rxrpc_call, link); | |
702 | _debug("Zapping call %p", call); | |
17926a79 | 703 | |
b1302342 DH |
704 | rxrpc_see_call(call); |
705 | list_del_init(&call->link); | |
17926a79 | 706 | |
b1302342 | 707 | pr_err("Call %p still in use (%d,%s,%lx,%lx)!\n", |
a0575429 | 708 | call, refcount_read(&call->ref), |
b1302342 DH |
709 | rxrpc_call_states[call->state], |
710 | call->flags, call->events); | |
17926a79 | 711 | |
ad25f5cb | 712 | spin_unlock_bh(&rxnet->call_lock); |
b1302342 | 713 | cond_resched(); |
ad25f5cb | 714 | spin_lock_bh(&rxnet->call_lock); |
b1302342 | 715 | } |
17926a79 | 716 | |
ad25f5cb | 717 | spin_unlock_bh(&rxnet->call_lock); |
17926a79 DH |
718 | } |
719 | ||
d3be4d24 | 720 | atomic_dec(&rxnet->nr_calls); |
5bb053be | 721 | wait_var_event(&rxnet->nr_calls, !atomic_read(&rxnet->nr_calls)); |
17926a79 | 722 | } |