Commit | Line | Data |
---|---|---|
17926a79 DH |
1 | /* AF_RXRPC implementation |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
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> |
ce6654cf | 15 | #include <linux/kernel.h> |
17926a79 | 16 | #include <linux/net.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
17926a79 DH |
18 | #include <linux/skbuff.h> |
19 | #include <linux/poll.h> | |
20 | #include <linux/proc_fs.h> | |
76181c13 | 21 | #include <linux/key-type.h> |
457c4cbc | 22 | #include <net/net_namespace.h> |
17926a79 DH |
23 | #include <net/sock.h> |
24 | #include <net/af_rxrpc.h> | |
25 | #include "ar-internal.h" | |
26 | ||
27 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
28 | MODULE_AUTHOR("Red Hat, Inc."); | |
29 | MODULE_LICENSE("GPL"); | |
30 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
31 | ||
95c96174 | 32 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 33 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 34 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 DH |
35 | |
36 | static int sysctl_rxrpc_max_qlen __read_mostly = 10; | |
37 | ||
38 | static struct proto rxrpc_proto; | |
39 | static const struct proto_ops rxrpc_rpc_ops; | |
40 | ||
41 | /* local epoch for detecting local-end reset */ | |
0d12f8a4 | 42 | u32 rxrpc_epoch; |
17926a79 DH |
43 | |
44 | /* current debugging ID */ | |
45 | atomic_t rxrpc_debug_id; | |
46 | ||
47 | /* count of skbs currently in use */ | |
48 | atomic_t rxrpc_n_skbs; | |
49 | ||
651350d1 DH |
50 | struct workqueue_struct *rxrpc_workqueue; |
51 | ||
17926a79 DH |
52 | static void rxrpc_sock_destructor(struct sock *); |
53 | ||
54 | /* | |
55 | * see if an RxRPC socket is currently writable | |
56 | */ | |
57 | static inline int rxrpc_writable(struct sock *sk) | |
58 | { | |
59 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
60 | } | |
61 | ||
62 | /* | |
63 | * wait for write bufferage to become available | |
64 | */ | |
65 | static void rxrpc_write_space(struct sock *sk) | |
66 | { | |
67 | _enter("%p", sk); | |
43815482 | 68 | rcu_read_lock(); |
17926a79 | 69 | if (rxrpc_writable(sk)) { |
43815482 ED |
70 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
71 | ||
1ce0bf50 | 72 | if (skwq_has_sleeper(wq)) |
43815482 | 73 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 74 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 75 | } |
43815482 | 76 | rcu_read_unlock(); |
17926a79 DH |
77 | } |
78 | ||
79 | /* | |
80 | * validate an RxRPC address | |
81 | */ | |
82 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
83 | struct sockaddr_rxrpc *srx, | |
84 | int len) | |
85 | { | |
dad8aff7 | 86 | unsigned int tail; |
ab802ee0 | 87 | |
17926a79 DH |
88 | if (len < sizeof(struct sockaddr_rxrpc)) |
89 | return -EINVAL; | |
90 | ||
91 | if (srx->srx_family != AF_RXRPC) | |
92 | return -EAFNOSUPPORT; | |
93 | ||
94 | if (srx->transport_type != SOCK_DGRAM) | |
95 | return -ESOCKTNOSUPPORT; | |
96 | ||
97 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
98 | if (srx->transport_len < sizeof(sa_family_t) || | |
99 | srx->transport_len > len) | |
100 | return -EINVAL; | |
101 | ||
102 | if (srx->transport.family != rx->proto) | |
103 | return -EAFNOSUPPORT; | |
104 | ||
105 | switch (srx->transport.family) { | |
106 | case AF_INET: | |
21454aaa | 107 | _debug("INET: %x @ %pI4", |
17926a79 | 108 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 109 | &srx->transport.sin.sin_addr); |
ab802ee0 | 110 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
111 | break; |
112 | ||
113 | case AF_INET6: | |
114 | default: | |
115 | return -EAFNOSUPPORT; | |
116 | } | |
117 | ||
ab802ee0 DH |
118 | if (tail < len) |
119 | memset((void *)srx + tail, 0, len - tail); | |
17926a79 DH |
120 | return 0; |
121 | } | |
122 | ||
123 | /* | |
124 | * bind a local address to an RxRPC socket | |
125 | */ | |
126 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
127 | { | |
b4f1342f | 128 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
129 | struct sock *sk = sock->sk; |
130 | struct rxrpc_local *local; | |
131 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
17926a79 DH |
132 | int ret; |
133 | ||
134 | _enter("%p,%p,%d", rx, saddr, len); | |
135 | ||
136 | ret = rxrpc_validate_address(rx, srx, len); | |
137 | if (ret < 0) | |
138 | goto error; | |
139 | ||
140 | lock_sock(&rx->sk); | |
141 | ||
2341e077 | 142 | if (rx->sk.sk_state != RXRPC_UNBOUND) { |
17926a79 DH |
143 | ret = -EINVAL; |
144 | goto error_unlock; | |
145 | } | |
146 | ||
147 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
148 | ||
17926a79 DH |
149 | local = rxrpc_lookup_local(&rx->srx); |
150 | if (IS_ERR(local)) { | |
151 | ret = PTR_ERR(local); | |
152 | goto error_unlock; | |
153 | } | |
154 | ||
2341e077 | 155 | if (rx->srx.srx_service) { |
17926a79 DH |
156 | write_lock_bh(&local->services_lock); |
157 | list_for_each_entry(prx, &local->services, listen_link) { | |
2341e077 | 158 | if (prx->srx.srx_service == rx->srx.srx_service) |
17926a79 DH |
159 | goto service_in_use; |
160 | } | |
161 | ||
2341e077 | 162 | rx->local = local; |
17926a79 DH |
163 | list_add_tail(&rx->listen_link, &local->services); |
164 | write_unlock_bh(&local->services_lock); | |
165 | ||
166 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
167 | } else { | |
2341e077 | 168 | rx->local = local; |
17926a79 DH |
169 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; |
170 | } | |
171 | ||
172 | release_sock(&rx->sk); | |
173 | _leave(" = 0"); | |
174 | return 0; | |
175 | ||
176 | service_in_use: | |
17926a79 | 177 | write_unlock_bh(&local->services_lock); |
2341e077 DH |
178 | rxrpc_put_local(local); |
179 | ret = -EADDRINUSE; | |
17926a79 DH |
180 | error_unlock: |
181 | release_sock(&rx->sk); | |
182 | error: | |
183 | _leave(" = %d", ret); | |
184 | return ret; | |
185 | } | |
186 | ||
187 | /* | |
188 | * set the number of pending calls permitted on a listening socket | |
189 | */ | |
190 | static int rxrpc_listen(struct socket *sock, int backlog) | |
191 | { | |
192 | struct sock *sk = sock->sk; | |
193 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
194 | int ret; | |
195 | ||
196 | _enter("%p,%d", rx, backlog); | |
197 | ||
198 | lock_sock(&rx->sk); | |
199 | ||
200 | switch (rx->sk.sk_state) { | |
2341e077 | 201 | case RXRPC_UNBOUND: |
17926a79 DH |
202 | ret = -EADDRNOTAVAIL; |
203 | break; | |
2341e077 | 204 | case RXRPC_CLIENT_UNBOUND: |
17926a79 | 205 | case RXRPC_CLIENT_BOUND: |
17926a79 DH |
206 | default: |
207 | ret = -EBUSY; | |
208 | break; | |
209 | case RXRPC_SERVER_BOUND: | |
210 | ASSERT(rx->local != NULL); | |
211 | sk->sk_max_ack_backlog = backlog; | |
212 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
213 | ret = 0; | |
214 | break; | |
215 | } | |
216 | ||
217 | release_sock(&rx->sk); | |
218 | _leave(" = %d", ret); | |
219 | return ret; | |
220 | } | |
221 | ||
222 | /* | |
223 | * find a transport by address | |
224 | */ | |
2341e077 DH |
225 | struct rxrpc_transport *rxrpc_name_to_transport(struct rxrpc_sock *rx, |
226 | struct sockaddr *addr, | |
227 | int addr_len, int flags, | |
228 | gfp_t gfp) | |
17926a79 DH |
229 | { |
230 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
231 | struct rxrpc_transport *trans; | |
17926a79 DH |
232 | struct rxrpc_peer *peer; |
233 | ||
234 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
235 | ||
236 | ASSERT(rx->local != NULL); | |
17926a79 DH |
237 | |
238 | if (rx->srx.transport_type != srx->transport_type) | |
239 | return ERR_PTR(-ESOCKTNOSUPPORT); | |
240 | if (rx->srx.transport.family != srx->transport.family) | |
241 | return ERR_PTR(-EAFNOSUPPORT); | |
242 | ||
243 | /* find a remote transport endpoint from the local one */ | |
651350d1 | 244 | peer = rxrpc_get_peer(srx, gfp); |
17926a79 | 245 | if (IS_ERR(peer)) |
e231c2ee | 246 | return ERR_CAST(peer); |
17926a79 DH |
247 | |
248 | /* find a transport */ | |
651350d1 | 249 | trans = rxrpc_get_transport(rx->local, peer, gfp); |
17926a79 DH |
250 | rxrpc_put_peer(peer); |
251 | _leave(" = %p", trans); | |
252 | return trans; | |
253 | } | |
254 | ||
651350d1 DH |
255 | /** |
256 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
257 | * @sock: The socket on which to make the call | |
2341e077 | 258 | * @srx: The address of the peer to contact |
651350d1 DH |
259 | * @key: The security context to use (defaults to socket setting) |
260 | * @user_call_ID: The ID to use | |
261 | * | |
262 | * Allow a kernel service to begin a call on the nominated socket. This just | |
263 | * sets up all the internal tracking structures and allocates connection and | |
264 | * call IDs as appropriate. The call to be used is returned. | |
265 | * | |
266 | * The default socket destination address and security may be overridden by | |
267 | * supplying @srx and @key. | |
268 | */ | |
269 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
270 | struct sockaddr_rxrpc *srx, | |
271 | struct key *key, | |
272 | unsigned long user_call_ID, | |
273 | gfp_t gfp) | |
274 | { | |
275 | struct rxrpc_conn_bundle *bundle; | |
276 | struct rxrpc_transport *trans; | |
277 | struct rxrpc_call *call; | |
278 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
651350d1 DH |
279 | |
280 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
281 | ||
282 | lock_sock(&rx->sk); | |
283 | ||
2341e077 DH |
284 | trans = rxrpc_name_to_transport(rx, (struct sockaddr *)srx, |
285 | sizeof(*srx), 0, gfp); | |
286 | if (IS_ERR(trans)) { | |
287 | call = ERR_CAST(trans); | |
288 | trans = NULL; | |
289 | goto out_notrans; | |
651350d1 DH |
290 | } |
291 | ||
651350d1 DH |
292 | if (!key) |
293 | key = rx->key; | |
146aa8b1 | 294 | if (key && !key->payload.data[0]) |
651350d1 DH |
295 | key = NULL; /* a no-security key */ |
296 | ||
0d12f8a4 | 297 | bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, gfp); |
651350d1 | 298 | if (IS_ERR(bundle)) { |
e231c2ee | 299 | call = ERR_CAST(bundle); |
651350d1 DH |
300 | goto out; |
301 | } | |
302 | ||
2341e077 | 303 | call = rxrpc_new_client_call(rx, trans, bundle, user_call_ID, gfp); |
651350d1 DH |
304 | rxrpc_put_bundle(trans, bundle); |
305 | out: | |
306 | rxrpc_put_transport(trans); | |
15bde727 | 307 | out_notrans: |
651350d1 DH |
308 | release_sock(&rx->sk); |
309 | _leave(" = %p", call); | |
310 | return call; | |
311 | } | |
651350d1 DH |
312 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
313 | ||
314 | /** | |
315 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
316 | * @call: The call to end | |
317 | * | |
318 | * Allow a kernel service to end a call it was using. The call must be | |
319 | * complete before this is called (the call should be aborted if necessary). | |
320 | */ | |
321 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
322 | { | |
323 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
324 | rxrpc_remove_user_ID(call->socket, call); | |
325 | rxrpc_put_call(call); | |
326 | } | |
651350d1 DH |
327 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
328 | ||
329 | /** | |
330 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
331 | * @sock: The socket to intercept received messages on | |
332 | * @interceptor: The function to pass the messages to | |
333 | * | |
334 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
335 | * RxRPC socket. They get passed to the specified function instead. | |
336 | * @interceptor should free the socket buffers it is given. @interceptor is | |
337 | * called with the socket receive queue spinlock held and softirqs disabled - | |
338 | * this ensures that the messages will be delivered in the right order. | |
339 | */ | |
340 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
341 | rxrpc_interceptor_t interceptor) | |
342 | { | |
343 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
344 | ||
345 | _enter(""); | |
346 | rx->interceptor = interceptor; | |
347 | } | |
348 | ||
349 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
350 | ||
17926a79 DH |
351 | /* |
352 | * connect an RxRPC socket | |
353 | * - this just targets it at a specific destination; no actual connection | |
354 | * negotiation takes place | |
355 | */ | |
356 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
357 | int addr_len, int flags) | |
358 | { | |
2341e077 DH |
359 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
360 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
361 | int ret; |
362 | ||
363 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
364 | ||
365 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
366 | if (ret < 0) { | |
367 | _leave(" = %d [bad addr]", ret); | |
368 | return ret; | |
369 | } | |
370 | ||
371 | lock_sock(&rx->sk); | |
372 | ||
2341e077 DH |
373 | ret = -EISCONN; |
374 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
375 | goto error; | |
376 | ||
17926a79 | 377 | switch (rx->sk.sk_state) { |
2341e077 DH |
378 | case RXRPC_UNBOUND: |
379 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
380 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
381 | case RXRPC_CLIENT_BOUND: |
382 | break; | |
17926a79 | 383 | default: |
2341e077 DH |
384 | ret = -EBUSY; |
385 | goto error; | |
17926a79 DH |
386 | } |
387 | ||
2341e077 DH |
388 | rx->connect_srx = *srx; |
389 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
390 | ret = 0; | |
17926a79 | 391 | |
2341e077 | 392 | error: |
17926a79 | 393 | release_sock(&rx->sk); |
2341e077 | 394 | return ret; |
17926a79 DH |
395 | } |
396 | ||
397 | /* | |
398 | * send a message through an RxRPC socket | |
399 | * - in a client this does a number of things: | |
400 | * - finds/sets up a connection for the security specified (if any) | |
401 | * - initiates a call (ID in control data) | |
402 | * - ends the request phase of a call (if MSG_MORE is not set) | |
403 | * - sends a call data packet | |
404 | * - may send an abort (abort code in control data) | |
405 | */ | |
1b784140 | 406 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 407 | { |
2341e077 | 408 | struct rxrpc_local *local; |
17926a79 DH |
409 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
410 | int ret; | |
411 | ||
412 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
413 | ||
414 | if (m->msg_flags & MSG_OOB) | |
415 | return -EOPNOTSUPP; | |
416 | ||
417 | if (m->msg_name) { | |
418 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
419 | if (ret < 0) { | |
420 | _leave(" = %d [bad addr]", ret); | |
421 | return ret; | |
422 | } | |
423 | } | |
424 | ||
17926a79 DH |
425 | lock_sock(&rx->sk); |
426 | ||
17926a79 | 427 | switch (rx->sk.sk_state) { |
2341e077 DH |
428 | case RXRPC_UNBOUND: |
429 | local = rxrpc_lookup_local(&rx->srx); | |
430 | if (IS_ERR(local)) { | |
431 | ret = PTR_ERR(local); | |
432 | goto error_unlock; | |
17926a79 | 433 | } |
2341e077 DH |
434 | |
435 | rx->local = local; | |
436 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
437 | /* Fall through */ | |
438 | ||
439 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 440 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
441 | if (!m->msg_name && |
442 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
443 | m->msg_name = &rx->connect_srx; | |
444 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 445 | } |
2341e077 DH |
446 | case RXRPC_SERVER_BOUND: |
447 | case RXRPC_SERVER_LISTENING: | |
448 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
449 | break; |
450 | default: | |
2341e077 | 451 | ret = -EINVAL; |
17926a79 DH |
452 | break; |
453 | } | |
454 | ||
2341e077 | 455 | error_unlock: |
17926a79 | 456 | release_sock(&rx->sk); |
17926a79 DH |
457 | _leave(" = %d", ret); |
458 | return ret; | |
459 | } | |
460 | ||
461 | /* | |
462 | * set RxRPC socket options | |
463 | */ | |
464 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 465 | char __user *optval, unsigned int optlen) |
17926a79 DH |
466 | { |
467 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 468 | unsigned int min_sec_level; |
17926a79 DH |
469 | int ret; |
470 | ||
471 | _enter(",%d,%d,,%d", level, optname, optlen); | |
472 | ||
473 | lock_sock(&rx->sk); | |
474 | ret = -EOPNOTSUPP; | |
475 | ||
476 | if (level == SOL_RXRPC) { | |
477 | switch (optname) { | |
478 | case RXRPC_EXCLUSIVE_CONNECTION: | |
479 | ret = -EINVAL; | |
480 | if (optlen != 0) | |
481 | goto error; | |
482 | ret = -EISCONN; | |
2341e077 | 483 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
484 | goto error; |
485 | set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); | |
486 | goto success; | |
487 | ||
488 | case RXRPC_SECURITY_KEY: | |
489 | ret = -EINVAL; | |
490 | if (rx->key) | |
491 | goto error; | |
492 | ret = -EISCONN; | |
2341e077 | 493 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
494 | goto error; |
495 | ret = rxrpc_request_key(rx, optval, optlen); | |
496 | goto error; | |
497 | ||
498 | case RXRPC_SECURITY_KEYRING: | |
499 | ret = -EINVAL; | |
500 | if (rx->key) | |
501 | goto error; | |
502 | ret = -EISCONN; | |
2341e077 | 503 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
504 | goto error; |
505 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
506 | goto error; | |
507 | ||
508 | case RXRPC_MIN_SECURITY_LEVEL: | |
509 | ret = -EINVAL; | |
95c96174 | 510 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
511 | goto error; |
512 | ret = -EISCONN; | |
2341e077 | 513 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
514 | goto error; |
515 | ret = get_user(min_sec_level, | |
95c96174 | 516 | (unsigned int __user *) optval); |
17926a79 DH |
517 | if (ret < 0) |
518 | goto error; | |
519 | ret = -EINVAL; | |
520 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
521 | goto error; | |
522 | rx->min_sec_level = min_sec_level; | |
523 | goto success; | |
524 | ||
525 | default: | |
526 | break; | |
527 | } | |
528 | } | |
529 | ||
530 | success: | |
531 | ret = 0; | |
532 | error: | |
533 | release_sock(&rx->sk); | |
534 | return ret; | |
535 | } | |
536 | ||
537 | /* | |
538 | * permit an RxRPC socket to be polled | |
539 | */ | |
540 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
541 | poll_table *wait) | |
542 | { | |
543 | unsigned int mask; | |
544 | struct sock *sk = sock->sk; | |
545 | ||
aa395145 | 546 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
547 | mask = 0; |
548 | ||
549 | /* the socket is readable if there are any messages waiting on the Rx | |
550 | * queue */ | |
551 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
552 | mask |= POLLIN | POLLRDNORM; | |
553 | ||
554 | /* the socket is writable if there is space to add new data to the | |
555 | * socket; there is no guarantee that any particular call in progress | |
556 | * on the socket may have space in the Tx ACK window */ | |
557 | if (rxrpc_writable(sk)) | |
558 | mask |= POLLOUT | POLLWRNORM; | |
559 | ||
560 | return mask; | |
561 | } | |
562 | ||
563 | /* | |
564 | * create an RxRPC socket | |
565 | */ | |
3f378b68 EP |
566 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
567 | int kern) | |
17926a79 DH |
568 | { |
569 | struct rxrpc_sock *rx; | |
570 | struct sock *sk; | |
571 | ||
572 | _enter("%p,%d", sock, protocol); | |
573 | ||
09ad9bc7 | 574 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
575 | return -EAFNOSUPPORT; |
576 | ||
b4f1342f | 577 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
578 | if (protocol != PF_INET) |
579 | return -EPROTONOSUPPORT; | |
580 | ||
581 | if (sock->type != SOCK_DGRAM) | |
582 | return -ESOCKTNOSUPPORT; | |
583 | ||
584 | sock->ops = &rxrpc_rpc_ops; | |
585 | sock->state = SS_UNCONNECTED; | |
586 | ||
11aa9c28 | 587 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
588 | if (!sk) |
589 | return -ENOMEM; | |
590 | ||
591 | sock_init_data(sock, sk); | |
2341e077 | 592 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 DH |
593 | sk->sk_write_space = rxrpc_write_space; |
594 | sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen; | |
595 | sk->sk_destruct = rxrpc_sock_destructor; | |
596 | ||
597 | rx = rxrpc_sk(sk); | |
598 | rx->proto = protocol; | |
599 | rx->calls = RB_ROOT; | |
600 | ||
601 | INIT_LIST_HEAD(&rx->listen_link); | |
602 | INIT_LIST_HEAD(&rx->secureq); | |
603 | INIT_LIST_HEAD(&rx->acceptq); | |
604 | rwlock_init(&rx->call_lock); | |
605 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
606 | ||
607 | _leave(" = 0 [%p]", rx); | |
608 | return 0; | |
609 | } | |
610 | ||
611 | /* | |
612 | * RxRPC socket destructor | |
613 | */ | |
614 | static void rxrpc_sock_destructor(struct sock *sk) | |
615 | { | |
616 | _enter("%p", sk); | |
617 | ||
618 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
619 | ||
547b792c IJ |
620 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
621 | WARN_ON(!sk_unhashed(sk)); | |
622 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
623 | |
624 | if (!sock_flag(sk, SOCK_DEAD)) { | |
625 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
626 | return; | |
627 | } | |
628 | } | |
629 | ||
630 | /* | |
631 | * release an RxRPC socket | |
632 | */ | |
633 | static int rxrpc_release_sock(struct sock *sk) | |
634 | { | |
635 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
636 | ||
637 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
638 | ||
639 | /* declare the socket closed for business */ | |
640 | sock_orphan(sk); | |
641 | sk->sk_shutdown = SHUTDOWN_MASK; | |
642 | ||
643 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
644 | sk->sk_state = RXRPC_CLOSE; | |
645 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
646 | ||
647 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
648 | ||
649 | if (!list_empty(&rx->listen_link)) { | |
650 | write_lock_bh(&rx->local->services_lock); | |
651 | list_del(&rx->listen_link); | |
652 | write_unlock_bh(&rx->local->services_lock); | |
653 | } | |
654 | ||
655 | /* try to flush out this socket */ | |
656 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 657 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
658 | rxrpc_purge_queue(&sk->sk_receive_queue); |
659 | ||
660 | if (rx->conn) { | |
661 | rxrpc_put_connection(rx->conn); | |
662 | rx->conn = NULL; | |
663 | } | |
664 | ||
17926a79 DH |
665 | if (rx->local) { |
666 | rxrpc_put_local(rx->local); | |
667 | rx->local = NULL; | |
668 | } | |
669 | ||
670 | key_put(rx->key); | |
671 | rx->key = NULL; | |
672 | key_put(rx->securities); | |
673 | rx->securities = NULL; | |
674 | sock_put(sk); | |
675 | ||
676 | _leave(" = 0"); | |
677 | return 0; | |
678 | } | |
679 | ||
680 | /* | |
681 | * release an RxRPC BSD socket on close() or equivalent | |
682 | */ | |
683 | static int rxrpc_release(struct socket *sock) | |
684 | { | |
685 | struct sock *sk = sock->sk; | |
686 | ||
687 | _enter("%p{%p}", sock, sk); | |
688 | ||
689 | if (!sk) | |
690 | return 0; | |
691 | ||
692 | sock->sk = NULL; | |
693 | ||
694 | return rxrpc_release_sock(sk); | |
695 | } | |
696 | ||
697 | /* | |
698 | * RxRPC network protocol | |
699 | */ | |
700 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 701 | .family = PF_RXRPC, |
17926a79 DH |
702 | .owner = THIS_MODULE, |
703 | .release = rxrpc_release, | |
704 | .bind = rxrpc_bind, | |
705 | .connect = rxrpc_connect, | |
706 | .socketpair = sock_no_socketpair, | |
707 | .accept = sock_no_accept, | |
708 | .getname = sock_no_getname, | |
709 | .poll = rxrpc_poll, | |
710 | .ioctl = sock_no_ioctl, | |
711 | .listen = rxrpc_listen, | |
712 | .shutdown = sock_no_shutdown, | |
713 | .setsockopt = rxrpc_setsockopt, | |
714 | .getsockopt = sock_no_getsockopt, | |
715 | .sendmsg = rxrpc_sendmsg, | |
716 | .recvmsg = rxrpc_recvmsg, | |
717 | .mmap = sock_no_mmap, | |
718 | .sendpage = sock_no_sendpage, | |
719 | }; | |
720 | ||
721 | static struct proto rxrpc_proto = { | |
722 | .name = "RXRPC", | |
723 | .owner = THIS_MODULE, | |
724 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 725 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
726 | }; |
727 | ||
ec1b4cf7 | 728 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
729 | .family = PF_RXRPC, |
730 | .create = rxrpc_create, | |
731 | .owner = THIS_MODULE, | |
732 | }; | |
733 | ||
734 | /* | |
735 | * initialise and register the RxRPC protocol | |
736 | */ | |
737 | static int __init af_rxrpc_init(void) | |
738 | { | |
17926a79 DH |
739 | int ret = -1; |
740 | ||
ce6654cf | 741 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 742 | |
0d12f8a4 | 743 | rxrpc_epoch = get_seconds(); |
17926a79 | 744 | |
651350d1 | 745 | ret = -ENOMEM; |
17926a79 DH |
746 | rxrpc_call_jar = kmem_cache_create( |
747 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 748 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 749 | if (!rxrpc_call_jar) { |
9b6d5398 | 750 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
751 | goto error_call_jar; |
752 | } | |
753 | ||
e1fcc7e2 | 754 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 755 | if (!rxrpc_workqueue) { |
9b6d5398 | 756 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
757 | goto error_work_queue; |
758 | } | |
759 | ||
648af7fc DH |
760 | ret = rxrpc_init_security(); |
761 | if (ret < 0) { | |
9b6d5398 | 762 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
763 | goto error_security; |
764 | } | |
765 | ||
17926a79 | 766 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 767 | if (ret < 0) { |
9b6d5398 | 768 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
769 | goto error_proto; |
770 | } | |
771 | ||
772 | ret = sock_register(&rxrpc_family_ops); | |
773 | if (ret < 0) { | |
9b6d5398 | 774 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
775 | goto error_sock; |
776 | } | |
777 | ||
778 | ret = register_key_type(&key_type_rxrpc); | |
779 | if (ret < 0) { | |
9b6d5398 | 780 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
781 | goto error_key_type; |
782 | } | |
783 | ||
784 | ret = register_key_type(&key_type_rxrpc_s); | |
785 | if (ret < 0) { | |
9b6d5398 | 786 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
787 | goto error_key_type_s; |
788 | } | |
789 | ||
5873c083 DH |
790 | ret = rxrpc_sysctl_init(); |
791 | if (ret < 0) { | |
9b6d5398 | 792 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
793 | goto error_sysctls; |
794 | } | |
795 | ||
17926a79 | 796 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
797 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
798 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
799 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
800 | #endif |
801 | return 0; | |
802 | ||
5873c083 DH |
803 | error_sysctls: |
804 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
805 | error_key_type_s: |
806 | unregister_key_type(&key_type_rxrpc); | |
807 | error_key_type: | |
808 | sock_unregister(PF_RXRPC); | |
809 | error_sock: | |
810 | proto_unregister(&rxrpc_proto); | |
811 | error_proto: | |
651350d1 | 812 | destroy_workqueue(rxrpc_workqueue); |
648af7fc DH |
813 | error_security: |
814 | rxrpc_exit_security(); | |
651350d1 | 815 | error_work_queue: |
17926a79 DH |
816 | kmem_cache_destroy(rxrpc_call_jar); |
817 | error_call_jar: | |
818 | return ret; | |
819 | } | |
820 | ||
821 | /* | |
822 | * unregister the RxRPC protocol | |
823 | */ | |
824 | static void __exit af_rxrpc_exit(void) | |
825 | { | |
826 | _enter(""); | |
5873c083 | 827 | rxrpc_sysctl_exit(); |
17926a79 DH |
828 | unregister_key_type(&key_type_rxrpc_s); |
829 | unregister_key_type(&key_type_rxrpc); | |
830 | sock_unregister(PF_RXRPC); | |
831 | proto_unregister(&rxrpc_proto); | |
832 | rxrpc_destroy_all_calls(); | |
833 | rxrpc_destroy_all_connections(); | |
834 | rxrpc_destroy_all_transports(); | |
835 | rxrpc_destroy_all_peers(); | |
836 | rxrpc_destroy_all_locals(); | |
837 | ||
838 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
839 | ||
840 | _debug("flush scheduled work"); | |
651350d1 | 841 | flush_workqueue(rxrpc_workqueue); |
ece31ffd G |
842 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
843 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 844 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 845 | rxrpc_exit_security(); |
17926a79 DH |
846 | kmem_cache_destroy(rxrpc_call_jar); |
847 | _leave(""); | |
848 | } | |
849 | ||
850 | module_init(af_rxrpc_init); | |
851 | module_exit(af_rxrpc_exit); |