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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 | */ | |
dad8aff7 | 23 | unsigned int rxrpc_connection_expiry = 10 * 60; |
5873c083 | 24 | |
17926a79 DH |
25 | static void rxrpc_connection_reaper(struct work_struct *work); |
26 | ||
27 | LIST_HEAD(rxrpc_connections); | |
4d028b2c | 28 | LIST_HEAD(rxrpc_connection_proc_list); |
17926a79 | 29 | DEFINE_RWLOCK(rxrpc_connection_lock); |
17926a79 DH |
30 | static DECLARE_DELAYED_WORK(rxrpc_connection_reap, rxrpc_connection_reaper); |
31 | ||
45025bce DH |
32 | static void rxrpc_destroy_connection(struct rcu_head *); |
33 | ||
17926a79 DH |
34 | /* |
35 | * allocate a new connection | |
36 | */ | |
c6d2b8d7 | 37 | struct rxrpc_connection *rxrpc_alloc_connection(gfp_t gfp) |
17926a79 DH |
38 | { |
39 | struct rxrpc_connection *conn; | |
40 | ||
41 | _enter(""); | |
42 | ||
43 | conn = kzalloc(sizeof(struct rxrpc_connection), gfp); | |
44 | if (conn) { | |
45025bce | 45 | INIT_LIST_HEAD(&conn->cache_link); |
999b69f8 | 46 | spin_lock_init(&conn->channel_lock); |
45025bce | 47 | INIT_LIST_HEAD(&conn->waiting_calls); |
17926a79 | 48 | INIT_WORK(&conn->processor, &rxrpc_process_connection); |
4d028b2c | 49 | INIT_LIST_HEAD(&conn->proc_link); |
999b69f8 | 50 | INIT_LIST_HEAD(&conn->link); |
17926a79 | 51 | skb_queue_head_init(&conn->rx_queue); |
e0e4d82f | 52 | conn->security = &rxrpc_no_security; |
17926a79 | 53 | spin_lock_init(&conn->state_lock); |
17926a79 | 54 | conn->debug_id = atomic_inc_return(&rxrpc_debug_id); |
17926a79 | 55 | conn->size_align = 4; |
0d12f8a4 | 56 | conn->header_size = sizeof(struct rxrpc_wire_header); |
f51b4480 | 57 | conn->idle_timestamp = jiffies; |
17926a79 DH |
58 | } |
59 | ||
16c61add | 60 | _leave(" = %p{%d}", conn, conn ? conn->debug_id : 0); |
17926a79 DH |
61 | return conn; |
62 | } | |
63 | ||
17926a79 | 64 | /* |
8496af50 DH |
65 | * Look up a connection in the cache by protocol parameters. |
66 | * | |
67 | * If successful, a pointer to the connection is returned, but no ref is taken. | |
68 | * NULL is returned if there is no match. | |
69 | * | |
70 | * The caller must be holding the RCU read lock. | |
17926a79 | 71 | */ |
8496af50 DH |
72 | struct rxrpc_connection *rxrpc_find_connection_rcu(struct rxrpc_local *local, |
73 | struct sk_buff *skb) | |
17926a79 DH |
74 | { |
75 | struct rxrpc_connection *conn; | |
1291e9d1 | 76 | struct rxrpc_conn_proto k; |
42886ffe | 77 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
1291e9d1 DH |
78 | struct sockaddr_rxrpc srx; |
79 | struct rxrpc_peer *peer; | |
17926a79 | 80 | |
8496af50 | 81 | _enter(",%x", sp->hdr.cid & RXRPC_CIDMASK); |
17926a79 | 82 | |
1291e9d1 DH |
83 | if (rxrpc_extract_addr_from_skb(&srx, skb) < 0) |
84 | goto not_found; | |
17926a79 | 85 | |
8496af50 DH |
86 | k.epoch = sp->hdr.epoch; |
87 | k.cid = sp->hdr.cid & RXRPC_CIDMASK; | |
88 | ||
1291e9d1 DH |
89 | /* We may have to handle mixing IPv4 and IPv6 */ |
90 | if (srx.transport.family != local->srx.transport.family) { | |
91 | pr_warn_ratelimited("AF_RXRPC: Protocol mismatch %u not %u\n", | |
92 | srx.transport.family, | |
93 | local->srx.transport.family); | |
94 | goto not_found; | |
95 | } | |
96 | ||
97 | k.epoch = sp->hdr.epoch; | |
98 | k.cid = sp->hdr.cid & RXRPC_CIDMASK; | |
17926a79 | 99 | |
4a3388c8 | 100 | if (sp->hdr.flags & RXRPC_CLIENT_INITIATED) { |
1291e9d1 DH |
101 | /* We need to look up service connections by the full protocol |
102 | * parameter set. We look up the peer first as an intermediate | |
103 | * step and then the connection from the peer's tree. | |
104 | */ | |
105 | peer = rxrpc_lookup_peer_rcu(local, &srx); | |
106 | if (!peer) | |
107 | goto not_found; | |
8496af50 DH |
108 | conn = rxrpc_find_service_conn_rcu(peer, skb); |
109 | if (!conn || atomic_read(&conn->usage) == 0) | |
110 | goto not_found; | |
111 | _leave(" = %p", conn); | |
112 | return conn; | |
4a3388c8 | 113 | } else { |
8496af50 DH |
114 | /* Look up client connections by connection ID alone as their |
115 | * IDs are unique for this machine. | |
116 | */ | |
1291e9d1 | 117 | conn = idr_find(&rxrpc_client_conn_ids, |
8496af50 DH |
118 | sp->hdr.cid >> RXRPC_CIDSHIFT); |
119 | if (!conn || atomic_read(&conn->usage) == 0) { | |
120 | _debug("no conn"); | |
121 | goto not_found; | |
122 | } | |
123 | ||
124 | if (conn->proto.epoch != k.epoch || | |
1291e9d1 DH |
125 | conn->params.local != local) |
126 | goto not_found; | |
127 | ||
128 | peer = conn->params.peer; | |
129 | switch (srx.transport.family) { | |
130 | case AF_INET: | |
131 | if (peer->srx.transport.sin.sin_port != | |
132 | srx.transport.sin.sin_port || | |
133 | peer->srx.transport.sin.sin_addr.s_addr != | |
134 | srx.transport.sin.sin_addr.s_addr) | |
135 | goto not_found; | |
136 | break; | |
d1912747 | 137 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
138 | case AF_INET6: |
139 | if (peer->srx.transport.sin6.sin6_port != | |
140 | srx.transport.sin6.sin6_port || | |
141 | memcmp(&peer->srx.transport.sin6.sin6_addr, | |
142 | &srx.transport.sin6.sin6_addr, | |
143 | sizeof(struct in6_addr)) != 0) | |
144 | goto not_found; | |
145 | break; | |
d1912747 | 146 | #endif |
1291e9d1 DH |
147 | default: |
148 | BUG(); | |
149 | } | |
150 | ||
1291e9d1 DH |
151 | _leave(" = %p", conn); |
152 | return conn; | |
17926a79 DH |
153 | } |
154 | ||
1291e9d1 | 155 | not_found: |
17926a79 DH |
156 | _leave(" = NULL"); |
157 | return NULL; | |
17926a79 DH |
158 | } |
159 | ||
999b69f8 DH |
160 | /* |
161 | * Disconnect a call and clear any channel it occupies when that call | |
a1399f8b DH |
162 | * terminates. The caller must hold the channel_lock and must release the |
163 | * call's ref on the connection. | |
999b69f8 | 164 | */ |
45025bce DH |
165 | void __rxrpc_disconnect_call(struct rxrpc_connection *conn, |
166 | struct rxrpc_call *call) | |
999b69f8 | 167 | { |
01a90a45 DH |
168 | struct rxrpc_channel *chan = |
169 | &conn->channels[call->cid & RXRPC_CHANNELMASK]; | |
999b69f8 | 170 | |
01a90a45 | 171 | _enter("%d,%x", conn->debug_id, call->cid); |
999b69f8 | 172 | |
a1399f8b DH |
173 | if (rcu_access_pointer(chan->call) == call) { |
174 | /* Save the result of the call so that we can repeat it if necessary | |
175 | * through the channel, whilst disposing of the actual call record. | |
176 | */ | |
18bfeba5 | 177 | chan->last_service_id = call->service_id; |
f5c17aae DH |
178 | if (call->abort_code) { |
179 | chan->last_abort = call->abort_code; | |
18bfeba5 DH |
180 | chan->last_type = RXRPC_PACKET_TYPE_ABORT; |
181 | } else { | |
248f219c | 182 | chan->last_seq = call->rx_hard_ack; |
18bfeba5 DH |
183 | chan->last_type = RXRPC_PACKET_TYPE_ACK; |
184 | } | |
185 | /* Sync with rxrpc_conn_retransmit(). */ | |
a1399f8b DH |
186 | smp_wmb(); |
187 | chan->last_call = chan->call_id; | |
188 | chan->call_id = chan->call_counter; | |
e653cfe4 | 189 | |
a1399f8b | 190 | rcu_assign_pointer(chan->call, NULL); |
999b69f8 | 191 | } |
e653cfe4 | 192 | |
a1399f8b DH |
193 | _leave(""); |
194 | } | |
195 | ||
196 | /* | |
197 | * Disconnect a call and clear any channel it occupies when that call | |
198 | * terminates. | |
199 | */ | |
200 | void rxrpc_disconnect_call(struct rxrpc_call *call) | |
201 | { | |
202 | struct rxrpc_connection *conn = call->conn; | |
203 | ||
248f219c DH |
204 | spin_lock_bh(&conn->params.peer->lock); |
205 | hlist_del_init(&call->error_link); | |
206 | spin_unlock_bh(&conn->params.peer->lock); | |
207 | ||
45025bce DH |
208 | if (rxrpc_is_client_call(call)) |
209 | return rxrpc_disconnect_client_call(call); | |
210 | ||
a1399f8b | 211 | spin_lock(&conn->channel_lock); |
45025bce | 212 | __rxrpc_disconnect_call(conn, call); |
e653cfe4 DH |
213 | spin_unlock(&conn->channel_lock); |
214 | ||
215 | call->conn = NULL; | |
f51b4480 | 216 | conn->idle_timestamp = jiffies; |
e653cfe4 | 217 | rxrpc_put_connection(conn); |
999b69f8 DH |
218 | } |
219 | ||
45025bce DH |
220 | /* |
221 | * Kill off a connection. | |
222 | */ | |
223 | void rxrpc_kill_connection(struct rxrpc_connection *conn) | |
224 | { | |
225 | ASSERT(!rcu_access_pointer(conn->channels[0].call) && | |
226 | !rcu_access_pointer(conn->channels[1].call) && | |
227 | !rcu_access_pointer(conn->channels[2].call) && | |
228 | !rcu_access_pointer(conn->channels[3].call)); | |
229 | ASSERT(list_empty(&conn->cache_link)); | |
230 | ||
231 | write_lock(&rxrpc_connection_lock); | |
232 | list_del_init(&conn->proc_link); | |
233 | write_unlock(&rxrpc_connection_lock); | |
234 | ||
235 | /* Drain the Rx queue. Note that even though we've unpublished, an | |
236 | * incoming packet could still be being added to our Rx queue, so we | |
237 | * will need to drain it again in the RCU cleanup handler. | |
238 | */ | |
239 | rxrpc_purge_queue(&conn->rx_queue); | |
240 | ||
241 | /* Leave final destruction to RCU. The connection processor work item | |
242 | * must carry a ref on the connection to prevent us getting here whilst | |
243 | * it is queued or running. | |
244 | */ | |
245 | call_rcu(&conn->rcu, rxrpc_destroy_connection); | |
246 | } | |
247 | ||
17926a79 DH |
248 | /* |
249 | * release a virtual connection | |
250 | */ | |
f51b4480 | 251 | void __rxrpc_put_connection(struct rxrpc_connection *conn) |
17926a79 | 252 | { |
f51b4480 | 253 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
17926a79 DH |
254 | } |
255 | ||
256 | /* | |
257 | * destroy a virtual connection | |
258 | */ | |
dee46364 | 259 | static void rxrpc_destroy_connection(struct rcu_head *rcu) |
17926a79 | 260 | { |
dee46364 DH |
261 | struct rxrpc_connection *conn = |
262 | container_of(rcu, struct rxrpc_connection, rcu); | |
263 | ||
264 | _enter("{%d,u=%d}", conn->debug_id, atomic_read(&conn->usage)); | |
17926a79 DH |
265 | |
266 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); | |
267 | ||
268 | _net("DESTROY CONN %d", conn->debug_id); | |
269 | ||
17926a79 DH |
270 | rxrpc_purge_queue(&conn->rx_queue); |
271 | ||
e0e4d82f | 272 | conn->security->clear(conn); |
19ffa01c | 273 | key_put(conn->params.key); |
e0e4d82f | 274 | key_put(conn->server_key); |
aa390bbe DH |
275 | rxrpc_put_peer(conn->params.peer); |
276 | rxrpc_put_local(conn->params.local); | |
e0e4d82f | 277 | |
17926a79 DH |
278 | kfree(conn); |
279 | _leave(""); | |
280 | } | |
281 | ||
282 | /* | |
45025bce | 283 | * reap dead service connections |
17926a79 | 284 | */ |
5eaa65b2 | 285 | static void rxrpc_connection_reaper(struct work_struct *work) |
17926a79 DH |
286 | { |
287 | struct rxrpc_connection *conn, *_p; | |
f51b4480 | 288 | unsigned long reap_older_than, earliest, idle_timestamp, now; |
17926a79 DH |
289 | |
290 | LIST_HEAD(graveyard); | |
291 | ||
292 | _enter(""); | |
293 | ||
f51b4480 DH |
294 | now = jiffies; |
295 | reap_older_than = now - rxrpc_connection_expiry * HZ; | |
17926a79 DH |
296 | earliest = ULONG_MAX; |
297 | ||
b3f57504 | 298 | write_lock(&rxrpc_connection_lock); |
17926a79 | 299 | list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) { |
001c1122 DH |
300 | ASSERTCMP(atomic_read(&conn->usage), >, 0); |
301 | if (likely(atomic_read(&conn->usage) > 1)) | |
17926a79 | 302 | continue; |
00e90712 DH |
303 | if (conn->state == RXRPC_CONN_SERVICE_PREALLOC) |
304 | continue; | |
17926a79 | 305 | |
f51b4480 DH |
306 | idle_timestamp = READ_ONCE(conn->idle_timestamp); |
307 | _debug("reap CONN %d { u=%d,t=%ld }", | |
308 | conn->debug_id, atomic_read(&conn->usage), | |
309 | (long)reap_older_than - (long)idle_timestamp); | |
310 | ||
311 | if (time_after(idle_timestamp, reap_older_than)) { | |
312 | if (time_before(idle_timestamp, earliest)) | |
313 | earliest = idle_timestamp; | |
001c1122 | 314 | continue; |
17926a79 | 315 | } |
001c1122 DH |
316 | |
317 | /* The usage count sits at 1 whilst the object is unused on the | |
318 | * list; we reduce that to 0 to make the object unavailable. | |
319 | */ | |
320 | if (atomic_cmpxchg(&conn->usage, 1, 0) != 1) | |
321 | continue; | |
322 | ||
323 | if (rxrpc_conn_is_client(conn)) | |
45025bce | 324 | BUG(); |
001c1122 DH |
325 | else |
326 | rxrpc_unpublish_service_conn(conn); | |
327 | ||
328 | list_move_tail(&conn->link, &graveyard); | |
17926a79 | 329 | } |
b3f57504 | 330 | write_unlock(&rxrpc_connection_lock); |
17926a79 DH |
331 | |
332 | if (earliest != ULONG_MAX) { | |
333 | _debug("reschedule reaper %ld", (long) earliest - now); | |
f51b4480 | 334 | ASSERT(time_after(earliest, now)); |
651350d1 | 335 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, |
f51b4480 | 336 | earliest - now); |
17926a79 DH |
337 | } |
338 | ||
17926a79 DH |
339 | while (!list_empty(&graveyard)) { |
340 | conn = list_entry(graveyard.next, struct rxrpc_connection, | |
341 | link); | |
342 | list_del_init(&conn->link); | |
343 | ||
344 | ASSERTCMP(atomic_read(&conn->usage), ==, 0); | |
45025bce | 345 | rxrpc_kill_connection(conn); |
17926a79 DH |
346 | } |
347 | ||
348 | _leave(""); | |
349 | } | |
350 | ||
351 | /* | |
45025bce DH |
352 | * preemptively destroy all the service connection records rather than |
353 | * waiting for them to time out | |
17926a79 DH |
354 | */ |
355 | void __exit rxrpc_destroy_all_connections(void) | |
356 | { | |
dee46364 DH |
357 | struct rxrpc_connection *conn, *_p; |
358 | bool leak = false; | |
359 | ||
17926a79 DH |
360 | _enter(""); |
361 | ||
45025bce DH |
362 | rxrpc_destroy_all_client_connections(); |
363 | ||
5873c083 | 364 | rxrpc_connection_expiry = 0; |
17926a79 | 365 | cancel_delayed_work(&rxrpc_connection_reap); |
651350d1 | 366 | rxrpc_queue_delayed_work(&rxrpc_connection_reap, 0); |
dee46364 DH |
367 | flush_workqueue(rxrpc_workqueue); |
368 | ||
369 | write_lock(&rxrpc_connection_lock); | |
370 | list_for_each_entry_safe(conn, _p, &rxrpc_connections, link) { | |
371 | pr_err("AF_RXRPC: Leaked conn %p {%d}\n", | |
372 | conn, atomic_read(&conn->usage)); | |
373 | leak = true; | |
374 | } | |
375 | write_unlock(&rxrpc_connection_lock); | |
376 | BUG_ON(leak); | |
377 | ||
45025bce DH |
378 | ASSERT(list_empty(&rxrpc_connection_proc_list)); |
379 | ||
dee46364 DH |
380 | /* Make sure the local and peer records pinned by any dying connections |
381 | * are released. | |
382 | */ | |
383 | rcu_barrier(); | |
384 | rxrpc_destroy_client_conn_ids(); | |
17926a79 DH |
385 | |
386 | _leave(""); | |
387 | } |