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45025bce | 1 | /* RxRPC virtual connection handler, common bits. |
17926a79 | 2 | * |
45025bce | 3 | * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved. |
17926a79 DH |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 | 14 | #include <linux/module.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
17926a79 DH |
16 | #include <linux/net.h> |
17 | #include <linux/skbuff.h> | |
17926a79 DH |
18 | #include "ar-internal.h" |
19 | ||
5873c083 DH |
20 | /* |
21 | * Time till a connection expires after last use (in seconds). | |
22 | */ | |
f859ab61 DH |
23 | unsigned int __read_mostly rxrpc_connection_expiry = 10 * 60; |
24 | unsigned int __read_mostly rxrpc_closed_conn_expiry = 10; | |
5873c083 | 25 | |
45025bce DH |
26 | static void rxrpc_destroy_connection(struct rcu_head *); |
27 | ||
3136ef49 DH |
28 | static void rxrpc_connection_timer(struct timer_list *timer) |
29 | { | |
30 | struct rxrpc_connection *conn = | |
31 | container_of(timer, struct rxrpc_connection, timer); | |
32 | ||
33 | rxrpc_queue_conn(conn); | |
34 | } | |
35 | ||
17926a79 DH |
36 | /* |
37 | * allocate a new connection | |
38 | */ | |
c6d2b8d7 | 39 | struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp) |
17926a79 DH |
40 | { |
41 | struct rxrpc_connection *conn; | |
42 | ||
43 | _enter(""); | |
44 | ||
45 | conn = kzalloc(sizeof(struct rxrpc_connection), gfp); | |
46 | if (conn) { | |
45025bce | 47 | INIT_LIST_HEAD(&conn->cache_link); |
999b69f8 | 48 | spin_lock_init(&conn->channel_lock); |
45025bce | 49 | INIT_LIST_HEAD(&conn->waiting_calls); |
3136ef49 | 50 | timer_setup(&conn->timer, &rxrpc_connection_timer, 0); |
17926a79 | 51 | INIT_WORK(&conn->processor, &rxrpc_process_connection); |
4d028b2c | 52 | INIT_LIST_HEAD(&conn->proc_link); |
999b69f8 | 53 | INIT_LIST_HEAD(&conn->link); |
17926a79 | 54 | skb_queue_head_init(&conn->rx_queue); |
e0e4d82f | 55 | conn->security = &rxrpc_no_security; |
17926a79 | 56 | spin_lock_init(&conn->state_lock); |
17926a79 | 57 | conn->debug_id = atomic_inc_return(&rxrpc_debug_id); |
17926a79 | 58 | conn->size_align = 4; |
f51b4480 | 59 | conn->idle_timestamp = jiffies; |
17926a79 DH |
60 | } |
61 | ||
16c61add | 62 | _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0); |
17926a79 DH |
63 | return conn; |
64 | } | |
65 | ||
17926a79 | 66 | /* |
8496af50 DH |
67 | * Look up a connection in the cache by protocol parameters. |
68 | * | |
69 | * If successful, a pointer to the connection is returned, but no ref is taken. | |
70 | * NULL is returned if there is no match. | |
71 | * | |
72 | * The caller must be holding the RCU read lock. | |
17926a79 | 73 | */ |
8496af50 DH |
74 | struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local, |
75 | struct sk_buff *skb) | |
17926a79 DH |
76 | { |
77 | struct rxrpc_connection *conn; | |
1291e9d1 | 78 | struct rxrpc_conn_proto k; |
42886ffe | 79 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
1291e9d1 DH |
80 | struct sockaddr_rxrpc srx; |
81 | struct rxrpc_peer *peer; | |
17926a79 | 82 | |
8496af50 | 83 | _enter(",%x", sp->hdr.cid & RXRPC_CIDMASK); |
17926a79 | 84 | |
7b674e39 | 85 | if (rxrpc_extract_addr_from_skb(local, &srx, skb) < 0) |
1291e9d1 | 86 | goto not_found; |
17926a79 | 87 | |
8496af50 DH |
88 | k.epoch = sp->hdr.epoch; |
89 | k.cid = sp->hdr.cid & RXRPC_CIDMASK; | |
90 | ||
1291e9d1 DH |
91 | /* We may have to handle mixing IPv4 and IPv6 */ |
92 | if (srx.transport.family != local->srx.transport.family) { | |
93 | pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n", | |
94 | srx.transport.family, | |
95 | local->srx.transport.family); | |
96 | goto not_found; | |
97 | } | |
98 | ||
99 | k.epoch = sp->hdr.epoch; | |
100 | k.cid = sp->hdr.cid & RXRPC_CIDMASK; | |
17926a79 | 101 | |
4a3388c8 | 102 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) { |
1291e9d1 DH |
103 | /* We need to look up service connections by the full protocol |
104 | * parameter set. We look up the peer first as an intermediate | |
105 | * step and then the connection from the peer's tree. | |
106 | */ | |
107 | peer = rxrpc_lookup_peer_rcu(local, &srx); | |
108 | if (!peer) | |
109 | goto not_found; | |
8496af50 DH |
110 | conn = rxrpc_find_service_conn_rcu(peer, skb); |
111 | if (!conn || atomic_read(&conn->usage) == 0) | |
112 | goto not_found; | |
113 | _leave(" = %p", conn); | |
114 | return conn; | |
4a3388c8 | 115 | } else { |
8496af50 DH |
116 | /* Look up client connections by connection ID alone as their |
117 | * IDs are unique for this machine. | |
118 | */ | |
1291e9d1 | 119 | conn = idr_find(&rxrpc_client_conn_ids, |
8496af50 DH |
120 | sp->hdr.cid >> RXRPC_CIDSHIFT); |
121 | if (!conn || atomic_read(&conn->usage) == 0) { | |
122 | _debug("no conn"); | |
123 | goto not_found; | |
124 | } | |
125 | ||
126 | if (conn->proto.epoch != k.epoch || | |
1291e9d1 DH |
127 | conn->params.local != local) |
128 | goto not_found; | |
129 | ||
130 | peer = conn->params.peer; | |
131 | switch (srx.transport.family) { | |
132 | case AF_INET: | |
133 | if (peer->srx.transport.sin.sin_port != | |
134 | srx.transport.sin.sin_port || | |
135 | peer->srx.transport.sin.sin_addr.s_addr != | |
136 | srx.transport.sin.sin_addr.s_addr) | |
137 | goto not_found; | |
138 | break; | |
d1912747 | 139 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
140 | case AF_INET6: |
141 | if (peer->srx.transport.sin6.sin6_port != | |
142 | srx.transport.sin6.sin6_port || | |
143 | memcmp(&peer->srx.transport.sin6.sin6_addr, | |
144 | &srx.transport.sin6.sin6_addr, | |
145 | sizeof(struct in6_addr)) != 0) | |
146 | goto not_found; | |
147 | break; | |
d1912747 | 148 | #endif |
1291e9d1 DH |
149 | default: |
150 | BUG(); | |
151 | } | |
152 | ||
1291e9d1 DH |
153 | _leave(" = %p", conn); |
154 | return conn; | |
17926a79 DH |
155 | } |
156 | ||
1291e9d1 | 157 | not_found: |
17926a79 DH |
158 | _leave(" = NULL"); |
159 | return NULL; | |
17926a79 DH |
160 | } |
161 | ||
999b69f8 DH |
162 | /* |
163 | * Disconnect a call and clear any channel it occupies when that call | |
a1399f8b DH |
164 | * terminates. The caller must hold the channel_lock and must release the |
165 | * call's ref on the connection. | |
999b69f8 | 166 | */ |
45025bce DH |
167 | void __rxrpc_disconnect_call(struct rxrpc_connection *conn, |
168 | struct rxrpc_call *call) | |
999b69f8 | 169 | { |
01a90a45 DH |
170 | struct rxrpc_channel *chan = |
171 | &conn->channels[call->cid & RXRPC_CHANNELMASK]; | |
999b69f8 | 172 | |
01a90a45 | 173 | _enter("%d,%x", conn->debug_id, call->cid); |
999b69f8 | 174 | |
a1399f8b DH |
175 | if (rcu_access_pointer(chan->call) == call) { |
176 | /* Save the result of the call so that we can repeat it if necessary | |
177 | * through the channel, whilst disposing of the actual call record. | |
178 | */ | |
b1d9f7fd | 179 | trace_rxrpc_disconnect_call(call); |
f5c17aae DH |
180 | if (call->abort_code) { |
181 | chan->last_abort = call->abort_code; | |
18bfeba5 DH |
182 | chan->last_type = RXRPC_PACKET_TYPE_ABORT; |
183 | } else { | |
248f219c | 184 | chan->last_seq = call->rx_hard_ack; |
18bfeba5 DH |
185 | chan->last_type = RXRPC_PACKET_TYPE_ACK; |
186 | } | |
187 | /* Sync with rxrpc_conn_retransmit(). */ | |
a1399f8b DH |
188 | smp_wmb(); |
189 | chan->last_call = chan->call_id; | |
190 | chan->call_id = chan->call_counter; | |
e653cfe4 | 191 | |
a1399f8b | 192 | rcu_assign_pointer(chan->call, NULL); |
999b69f8 | 193 | } |
e653cfe4 | 194 | |
a1399f8b DH |
195 | _leave(""); |
196 | } | |
197 | ||
198 | /* | |
199 | * Disconnect a call and clear any channel it occupies when that call | |
200 | * terminates. | |
201 | */ | |
202 | void rxrpc_disconnect_call(struct rxrpc_call *call) | |
203 | { | |
204 | struct rxrpc_connection *conn = call->conn; | |
205 | ||
f7aec129 DH |
206 | call->peer->cong_cwnd = call->cong_cwnd; |
207 | ||
248f219c DH |
208 | spin_lock_bh(&conn->params.peer->lock); |
209 | hlist_del_init(&call->error_link); | |
210 | spin_unlock_bh(&conn->params.peer->lock); | |
211 | ||
45025bce DH |
212 | if (rxrpc_is_client_call(call)) |
213 | return rxrpc_disconnect_client_call(call); | |
214 | ||
a1399f8b | 215 | spin_lock(&conn->channel_lock); |
45025bce | 216 | __rxrpc_disconnect_call(conn, call); |
e653cfe4 DH |
217 | spin_unlock(&conn->channel_lock); |
218 | ||
219 | call->conn = NULL; | |
f51b4480 | 220 | conn->idle_timestamp = jiffies; |
e653cfe4 | 221 | rxrpc_put_connection(conn); |
999b69f8 DH |
222 | } |
223 | ||
45025bce DH |
224 | /* |
225 | * Kill off a connection. | |
226 | */ | |
227 | void rxrpc_kill_connection(struct rxrpc_connection *conn) | |
228 | { | |
2baec2c3 DH |
229 | struct rxrpc_net *rxnet = conn->params.local->rxnet; |
230 | ||
45025bce DH |
231 | ASSERT(!rcu_access_pointer(conn->channels[0].call) && |
232 | !rcu_access_pointer(conn->channels[1].call) && | |
233 | !rcu_access_pointer(conn->channels[2].call) && | |
234 | !rcu_access_pointer(conn->channels[3].call)); | |
235 | ASSERT(list_empty(&conn->cache_link)); | |
236 | ||
2baec2c3 | 237 | write_lock(&rxnet->conn_lock); |
45025bce | 238 | list_del_init(&conn->proc_link); |
2baec2c3 | 239 | write_unlock(&rxnet->conn_lock); |
45025bce DH |
240 | |
241 | /* Drain the Rx queue. Note that even though we've unpublished, an | |
242 | * incoming packet could still be being added to our Rx queue, so we | |
243 | * will need to drain it again in the RCU cleanup handler. | |
244 | */ | |
245 | rxrpc_purge_queue(&conn->rx_queue); | |
246 | ||
247 | /* Leave final destruction to RCU. The connection processor work item | |
248 | * must carry a ref on the connection to prevent us getting here whilst | |
249 | * it is queued or running. | |
250 | */ | |
251 | call_rcu(&conn->rcu, rxrpc_destroy_connection); | |
252 | } | |
253 | ||
17926a79 | 254 | /* |
363deeab DH |
255 | * Queue a connection's work processor, getting a ref to pass to the work |
256 | * queue. | |
17926a79 | 257 | */ |
363deeab | 258 | bool rxrpc_queue_conn(struct rxrpc_connection *conn) |
17926a79 | 259 | { |
363deeab DH |
260 | const void *here = __builtin_return_address(0); |
261 | int n = __atomic_add_unless(&conn->usage, 1, 0); | |
262 | if (n == 0) | |
263 | return false; | |
264 | if (rxrpc_queue_work(&conn->processor)) | |
265 | trace_rxrpc_conn(conn, rxrpc_conn_queued, n + 1, here); | |
266 | else | |
267 | rxrpc_put_connection(conn); | |
268 | return true; | |
269 | } | |
270 | ||
271 | /* | |
272 | * Note the re-emergence of a connection. | |
273 | */ | |
274 | void rxrpc_see_connection(struct rxrpc_connection *conn) | |
275 | { | |
276 | const void *here = __builtin_return_address(0); | |
277 | if (conn) { | |
278 | int n = atomic_read(&conn->usage); | |
279 | ||
280 | trace_rxrpc_conn(conn, rxrpc_conn_seen, n, here); | |
281 | } | |
282 | } | |
283 | ||
284 | /* | |
285 | * Get a ref on a connection. | |
286 | */ | |
287 | void rxrpc_get_connection(struct rxrpc_connection *conn) | |
288 | { | |
289 | const void *here = __builtin_return_address(0); | |
290 | int n = atomic_inc_return(&conn->usage); | |
291 | ||
292 | trace_rxrpc_conn(conn, rxrpc_conn_got, n, here); | |
293 | } | |
294 | ||
295 | /* | |
296 | * Try to get a ref on a connection. | |
297 | */ | |
298 | struct rxrpc_connection * | |
299 | rxrpc_get_connection_maybe(struct rxrpc_connection *conn) | |
300 | { | |
301 | const void *here = __builtin_return_address(0); | |
302 | ||
303 | if (conn) { | |
304 | int n = __atomic_add_unless(&conn->usage, 1, 0); | |
305 | if (n > 0) | |
306 | trace_rxrpc_conn(conn, rxrpc_conn_got, n + 1, here); | |
307 | else | |
308 | conn = NULL; | |
309 | } | |
310 | return conn; | |
311 | } | |
312 | ||
3d18cbb7 DH |
313 | /* |
314 | * Set the service connection reap timer. | |
315 | */ | |
316 | static void rxrpc_set_service_reap_timer(struct rxrpc_net *rxnet, | |
317 | unsigned long reap_at) | |
318 | { | |
319 | if (rxnet->live) | |
320 | timer_reduce(&rxnet->service_conn_reap_timer, reap_at); | |
321 | } | |
322 | ||
363deeab DH |
323 | /* |
324 | * Release a service connection | |
325 | */ | |
326 | void rxrpc_put_service_conn(struct rxrpc_connection *conn) | |
327 | { | |
328 | const void *here = __builtin_return_address(0); | |
329 | int n; | |
330 | ||
331 | n = atomic_dec_return(&conn->usage); | |
332 | trace_rxrpc_conn(conn, rxrpc_conn_put_service, n, here); | |
333 | ASSERTCMP(n, >=, 0); | |
3d18cbb7 DH |
334 | if (n == 1) |
335 | rxrpc_set_service_reap_timer(conn->params.local->rxnet, | |
336 | jiffies + rxrpc_connection_expiry); | |
17926a79 DH |
337 | } |
338 | ||
339 | /* | |
340 | * destroy a virtual connection | |
341 | */ | |
dee46364 | 342 | static void rxrpc_destroy_connection(struct rcu_head *rcu) |
17926a79 | 343 | { |
dee46364 DH |
344 | struct rxrpc_connection *conn = |
345 | container_of(rcu, struct rxrpc_connection, rcu); | |
346 | ||
347 | _enter("{%d,u=%d}", conn->debug_id, atomic_read(&conn->usage)); | |
17926a79 DH |
348 | |
349 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); | |
350 | ||
351 | _net("DESTROY CONN %d", conn->debug_id); | |
352 | ||
3136ef49 | 353 | del_timer_sync(&conn->timer); |
17926a79 DH |
354 | rxrpc_purge_queue(&conn->rx_queue); |
355 | ||
e0e4d82f | 356 | conn->security->clear(conn); |
19ffa01c | 357 | key_put(conn->params.key); |
e0e4d82f | 358 | key_put(conn->server_key); |
aa390bbe DH |
359 | rxrpc_put_peer(conn->params.peer); |
360 | rxrpc_put_local(conn->params.local); | |
e0e4d82f | 361 | |
17926a79 DH |
362 | kfree(conn); |
363 | _leave(""); | |
364 | } | |
365 | ||
366 | /* | |
45025bce | 367 | * reap dead service connections |
17926a79 | 368 | */ |
2baec2c3 | 369 | void rxrpc_service_connection_reaper(struct work_struct *work) |
17926a79 DH |
370 | { |
371 | struct rxrpc_connection *conn, *_p; | |
2baec2c3 | 372 | struct rxrpc_net *rxnet = |
3d18cbb7 | 373 | container_of(work, struct rxrpc_net, service_conn_reaper); |
f859ab61 | 374 | unsigned long expire_at, earliest, idle_timestamp, now; |
17926a79 DH |
375 | |
376 | LIST_HEAD(graveyard); | |
377 | ||
378 | _enter(""); | |
379 | ||
f51b4480 | 380 | now = jiffies; |
f859ab61 | 381 | earliest = now + MAX_JIFFY_OFFSET; |
17926a79 | 382 | |
2baec2c3 DH |
383 | write_lock(&rxnet->conn_lock); |
384 | list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) { | |
001c1122 DH |
385 | ASSERTCMP(atomic_read(&conn->usage), >, 0); |
386 | if (likely(atomic_read(&conn->usage) > 1)) | |
17926a79 | 387 | continue; |
00e90712 DH |
388 | if (conn->state == RXRPC_CONN_SERVICE_PREALLOC) |
389 | continue; | |
17926a79 | 390 | |
f859ab61 DH |
391 | if (rxnet->live) { |
392 | idle_timestamp = READ_ONCE(conn->idle_timestamp); | |
393 | expire_at = idle_timestamp + rxrpc_connection_expiry * HZ; | |
394 | if (conn->params.local->service_closed) | |
395 | expire_at = idle_timestamp + rxrpc_closed_conn_expiry * HZ; | |
396 | ||
397 | _debug("reap CONN %d { u=%d,t=%ld }", | |
398 | conn->debug_id, atomic_read(&conn->usage), | |
399 | (long)expire_at - (long)now); | |
400 | ||
401 | if (time_before(now, expire_at)) { | |
402 | if (time_before(expire_at, earliest)) | |
403 | earliest = expire_at; | |
404 | continue; | |
405 | } | |
17926a79 | 406 | } |
001c1122 DH |
407 | |
408 | /* The usage count sits at 1 whilst the object is unused on the | |
409 | * list; we reduce that to 0 to make the object unavailable. | |
410 | */ | |
411 | if (atomic_cmpxchg(&conn->usage, 1, 0) != 1) | |
412 | continue; | |
f859ab61 | 413 | trace_rxrpc_conn(conn, rxrpc_conn_reap_service, 0, 0); |
001c1122 DH |
414 | |
415 | if (rxrpc_conn_is_client(conn)) | |
45025bce | 416 | BUG(); |
001c1122 DH |
417 | else |
418 | rxrpc_unpublish_service_conn(conn); | |
419 | ||
420 | list_move_tail(&conn->link, &graveyard); | |
17926a79 | 421 | } |
2baec2c3 | 422 | write_unlock(&rxnet->conn_lock); |
17926a79 | 423 | |
f859ab61 DH |
424 | if (earliest != now + MAX_JIFFY_OFFSET) { |
425 | _debug("reschedule reaper %ld", (long)earliest - (long)now); | |
f51b4480 | 426 | ASSERT(time_after(earliest, now)); |
3d7682af | 427 | rxrpc_set_service_reap_timer(rxnet, earliest); |
17926a79 DH |
428 | } |
429 | ||
17926a79 DH |
430 | while (!list_empty(&graveyard)) { |
431 | conn = list_entry(graveyard.next, struct rxrpc_connection, | |
432 | link); | |
433 | list_del_init(&conn->link); | |
434 | ||
435 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); | |
45025bce | 436 | rxrpc_kill_connection(conn); |
17926a79 DH |
437 | } |
438 | ||
439 | _leave(""); | |
440 | } | |
441 | ||
442 | /* | |
45025bce DH |
443 | * preemptively destroy all the service connection records rather than |
444 | * waiting for them to time out | |
17926a79 | 445 | */ |
2baec2c3 | 446 | void rxrpc_destroy_all_connections(struct rxrpc_net *rxnet) |
17926a79 | 447 | { |
dee46364 DH |
448 | struct rxrpc_connection *conn, *_p; |
449 | bool leak = false; | |
450 | ||
17926a79 DH |
451 | _enter(""); |
452 | ||
2baec2c3 | 453 | rxrpc_destroy_all_client_connections(rxnet); |
45025bce | 454 | |
3d18cbb7 DH |
455 | del_timer_sync(&rxnet->service_conn_reap_timer); |
456 | rxrpc_queue_work(&rxnet->service_conn_reaper); | |
dee46364 DH |
457 | flush_workqueue(rxrpc_workqueue); |
458 | ||
2baec2c3 DH |
459 | write_lock(&rxnet->conn_lock); |
460 | list_for_each_entry_safe(conn, _p, &rxnet->service_conns, link) { | |
dee46364 DH |
461 | pr_err("AF_RXRPC: Leaked conn %p {%d}\n", |
462 | conn, atomic_read(&conn->usage)); | |
463 | leak = true; | |
464 | } | |
2baec2c3 | 465 | write_unlock(&rxnet->conn_lock); |
dee46364 DH |
466 | BUG_ON(leak); |
467 | ||
2baec2c3 | 468 | ASSERT(list_empty(&rxnet->conn_proc_list)); |
17926a79 DH |
469 | |
470 | _leave(""); | |
471 | } |