Commit | Line | Data |
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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 | ||
12 | #include <linux/module.h> | |
13 | #include <linux/net.h> | |
14 | #include <linux/skbuff.h> | |
15 | #include <linux/poll.h> | |
16 | #include <linux/proc_fs.h> | |
76181c13 | 17 | #include <linux/key-type.h> |
457c4cbc | 18 | #include <net/net_namespace.h> |
17926a79 DH |
19 | #include <net/sock.h> |
20 | #include <net/af_rxrpc.h> | |
21 | #include "ar-internal.h" | |
22 | ||
23 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
24 | MODULE_AUTHOR("Red Hat, Inc."); | |
25 | MODULE_LICENSE("GPL"); | |
26 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
27 | ||
28 | unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO; | |
29 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); | |
424b00e2 | 30 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 DH |
31 | |
32 | static int sysctl_rxrpc_max_qlen __read_mostly = 10; | |
33 | ||
34 | static struct proto rxrpc_proto; | |
35 | static const struct proto_ops rxrpc_rpc_ops; | |
36 | ||
37 | /* local epoch for detecting local-end reset */ | |
38 | __be32 rxrpc_epoch; | |
39 | ||
40 | /* current debugging ID */ | |
41 | atomic_t rxrpc_debug_id; | |
42 | ||
43 | /* count of skbs currently in use */ | |
44 | atomic_t rxrpc_n_skbs; | |
45 | ||
651350d1 DH |
46 | struct workqueue_struct *rxrpc_workqueue; |
47 | ||
17926a79 DH |
48 | static void rxrpc_sock_destructor(struct sock *); |
49 | ||
50 | /* | |
51 | * see if an RxRPC socket is currently writable | |
52 | */ | |
53 | static inline int rxrpc_writable(struct sock *sk) | |
54 | { | |
55 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
56 | } | |
57 | ||
58 | /* | |
59 | * wait for write bufferage to become available | |
60 | */ | |
61 | static void rxrpc_write_space(struct sock *sk) | |
62 | { | |
63 | _enter("%p", sk); | |
64 | read_lock(&sk->sk_callback_lock); | |
65 | if (rxrpc_writable(sk)) { | |
66 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
67 | wake_up_interruptible(sk->sk_sleep); | |
8d8ad9d7 | 68 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 DH |
69 | } |
70 | read_unlock(&sk->sk_callback_lock); | |
71 | } | |
72 | ||
73 | /* | |
74 | * validate an RxRPC address | |
75 | */ | |
76 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
77 | struct sockaddr_rxrpc *srx, | |
78 | int len) | |
79 | { | |
80 | if (len < sizeof(struct sockaddr_rxrpc)) | |
81 | return -EINVAL; | |
82 | ||
83 | if (srx->srx_family != AF_RXRPC) | |
84 | return -EAFNOSUPPORT; | |
85 | ||
86 | if (srx->transport_type != SOCK_DGRAM) | |
87 | return -ESOCKTNOSUPPORT; | |
88 | ||
89 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
90 | if (srx->transport_len < sizeof(sa_family_t) || | |
91 | srx->transport_len > len) | |
92 | return -EINVAL; | |
93 | ||
94 | if (srx->transport.family != rx->proto) | |
95 | return -EAFNOSUPPORT; | |
96 | ||
97 | switch (srx->transport.family) { | |
98 | case AF_INET: | |
21454aaa | 99 | _debug("INET: %x @ %pI4", |
17926a79 | 100 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 101 | &srx->transport.sin.sin_addr); |
17926a79 DH |
102 | if (srx->transport_len > 8) |
103 | memset((void *)&srx->transport + 8, 0, | |
104 | srx->transport_len - 8); | |
105 | break; | |
106 | ||
107 | case AF_INET6: | |
108 | default: | |
109 | return -EAFNOSUPPORT; | |
110 | } | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | /* | |
116 | * bind a local address to an RxRPC socket | |
117 | */ | |
118 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
119 | { | |
120 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr; | |
121 | struct sock *sk = sock->sk; | |
122 | struct rxrpc_local *local; | |
123 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
124 | __be16 service_id; | |
125 | int ret; | |
126 | ||
127 | _enter("%p,%p,%d", rx, saddr, len); | |
128 | ||
129 | ret = rxrpc_validate_address(rx, srx, len); | |
130 | if (ret < 0) | |
131 | goto error; | |
132 | ||
133 | lock_sock(&rx->sk); | |
134 | ||
135 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) { | |
136 | ret = -EINVAL; | |
137 | goto error_unlock; | |
138 | } | |
139 | ||
140 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
141 | ||
142 | /* find a local transport endpoint if we don't have one already */ | |
143 | local = rxrpc_lookup_local(&rx->srx); | |
144 | if (IS_ERR(local)) { | |
145 | ret = PTR_ERR(local); | |
146 | goto error_unlock; | |
147 | } | |
148 | ||
149 | rx->local = local; | |
150 | if (srx->srx_service) { | |
151 | service_id = htons(srx->srx_service); | |
152 | write_lock_bh(&local->services_lock); | |
153 | list_for_each_entry(prx, &local->services, listen_link) { | |
154 | if (prx->service_id == service_id) | |
155 | goto service_in_use; | |
156 | } | |
157 | ||
158 | rx->service_id = service_id; | |
159 | list_add_tail(&rx->listen_link, &local->services); | |
160 | write_unlock_bh(&local->services_lock); | |
161 | ||
162 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
163 | } else { | |
164 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
165 | } | |
166 | ||
167 | release_sock(&rx->sk); | |
168 | _leave(" = 0"); | |
169 | return 0; | |
170 | ||
171 | service_in_use: | |
172 | ret = -EADDRINUSE; | |
173 | write_unlock_bh(&local->services_lock); | |
174 | error_unlock: | |
175 | release_sock(&rx->sk); | |
176 | error: | |
177 | _leave(" = %d", ret); | |
178 | return ret; | |
179 | } | |
180 | ||
181 | /* | |
182 | * set the number of pending calls permitted on a listening socket | |
183 | */ | |
184 | static int rxrpc_listen(struct socket *sock, int backlog) | |
185 | { | |
186 | struct sock *sk = sock->sk; | |
187 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
188 | int ret; | |
189 | ||
190 | _enter("%p,%d", rx, backlog); | |
191 | ||
192 | lock_sock(&rx->sk); | |
193 | ||
194 | switch (rx->sk.sk_state) { | |
195 | case RXRPC_UNCONNECTED: | |
196 | ret = -EADDRNOTAVAIL; | |
197 | break; | |
198 | case RXRPC_CLIENT_BOUND: | |
199 | case RXRPC_CLIENT_CONNECTED: | |
200 | default: | |
201 | ret = -EBUSY; | |
202 | break; | |
203 | case RXRPC_SERVER_BOUND: | |
204 | ASSERT(rx->local != NULL); | |
205 | sk->sk_max_ack_backlog = backlog; | |
206 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
207 | ret = 0; | |
208 | break; | |
209 | } | |
210 | ||
211 | release_sock(&rx->sk); | |
212 | _leave(" = %d", ret); | |
213 | return ret; | |
214 | } | |
215 | ||
216 | /* | |
217 | * find a transport by address | |
218 | */ | |
219 | static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock, | |
220 | struct sockaddr *addr, | |
651350d1 DH |
221 | int addr_len, int flags, |
222 | gfp_t gfp) | |
17926a79 DH |
223 | { |
224 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
225 | struct rxrpc_transport *trans; | |
226 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
227 | struct rxrpc_peer *peer; | |
228 | ||
229 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
230 | ||
231 | ASSERT(rx->local != NULL); | |
232 | ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED); | |
233 | ||
234 | if (rx->srx.transport_type != srx->transport_type) | |
235 | return ERR_PTR(-ESOCKTNOSUPPORT); | |
236 | if (rx->srx.transport.family != srx->transport.family) | |
237 | return ERR_PTR(-EAFNOSUPPORT); | |
238 | ||
239 | /* find a remote transport endpoint from the local one */ | |
651350d1 | 240 | peer = rxrpc_get_peer(srx, gfp); |
17926a79 | 241 | if (IS_ERR(peer)) |
e231c2ee | 242 | return ERR_CAST(peer); |
17926a79 DH |
243 | |
244 | /* find a transport */ | |
651350d1 | 245 | trans = rxrpc_get_transport(rx->local, peer, gfp); |
17926a79 DH |
246 | rxrpc_put_peer(peer); |
247 | _leave(" = %p", trans); | |
248 | return trans; | |
249 | } | |
250 | ||
651350d1 DH |
251 | /** |
252 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
253 | * @sock: The socket on which to make the call | |
254 | * @srx: The address of the peer to contact (defaults to socket setting) | |
255 | * @key: The security context to use (defaults to socket setting) | |
256 | * @user_call_ID: The ID to use | |
257 | * | |
258 | * Allow a kernel service to begin a call on the nominated socket. This just | |
259 | * sets up all the internal tracking structures and allocates connection and | |
260 | * call IDs as appropriate. The call to be used is returned. | |
261 | * | |
262 | * The default socket destination address and security may be overridden by | |
263 | * supplying @srx and @key. | |
264 | */ | |
265 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
266 | struct sockaddr_rxrpc *srx, | |
267 | struct key *key, | |
268 | unsigned long user_call_ID, | |
269 | gfp_t gfp) | |
270 | { | |
271 | struct rxrpc_conn_bundle *bundle; | |
272 | struct rxrpc_transport *trans; | |
273 | struct rxrpc_call *call; | |
274 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
275 | __be16 service_id; | |
276 | ||
277 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
278 | ||
279 | lock_sock(&rx->sk); | |
280 | ||
281 | if (srx) { | |
282 | trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx, | |
283 | sizeof(*srx), 0, gfp); | |
284 | if (IS_ERR(trans)) { | |
e231c2ee | 285 | call = ERR_CAST(trans); |
651350d1 DH |
286 | trans = NULL; |
287 | goto out; | |
288 | } | |
289 | } else { | |
290 | trans = rx->trans; | |
291 | if (!trans) { | |
292 | call = ERR_PTR(-ENOTCONN); | |
293 | goto out; | |
294 | } | |
295 | atomic_inc(&trans->usage); | |
296 | } | |
297 | ||
298 | service_id = rx->service_id; | |
299 | if (srx) | |
300 | service_id = htons(srx->srx_service); | |
301 | ||
302 | if (!key) | |
303 | key = rx->key; | |
304 | if (key && !key->payload.data) | |
305 | key = NULL; /* a no-security key */ | |
306 | ||
307 | bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp); | |
308 | if (IS_ERR(bundle)) { | |
e231c2ee | 309 | call = ERR_CAST(bundle); |
651350d1 DH |
310 | goto out; |
311 | } | |
312 | ||
313 | call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true, | |
314 | gfp); | |
315 | rxrpc_put_bundle(trans, bundle); | |
316 | out: | |
317 | rxrpc_put_transport(trans); | |
318 | release_sock(&rx->sk); | |
319 | _leave(" = %p", call); | |
320 | return call; | |
321 | } | |
322 | ||
323 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); | |
324 | ||
325 | /** | |
326 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
327 | * @call: The call to end | |
328 | * | |
329 | * Allow a kernel service to end a call it was using. The call must be | |
330 | * complete before this is called (the call should be aborted if necessary). | |
331 | */ | |
332 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
333 | { | |
334 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
335 | rxrpc_remove_user_ID(call->socket, call); | |
336 | rxrpc_put_call(call); | |
337 | } | |
338 | ||
339 | EXPORT_SYMBOL(rxrpc_kernel_end_call); | |
340 | ||
341 | /** | |
342 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
343 | * @sock: The socket to intercept received messages on | |
344 | * @interceptor: The function to pass the messages to | |
345 | * | |
346 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
347 | * RxRPC socket. They get passed to the specified function instead. | |
348 | * @interceptor should free the socket buffers it is given. @interceptor is | |
349 | * called with the socket receive queue spinlock held and softirqs disabled - | |
350 | * this ensures that the messages will be delivered in the right order. | |
351 | */ | |
352 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
353 | rxrpc_interceptor_t interceptor) | |
354 | { | |
355 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
356 | ||
357 | _enter(""); | |
358 | rx->interceptor = interceptor; | |
359 | } | |
360 | ||
361 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
362 | ||
17926a79 DH |
363 | /* |
364 | * connect an RxRPC socket | |
365 | * - this just targets it at a specific destination; no actual connection | |
366 | * negotiation takes place | |
367 | */ | |
368 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
369 | int addr_len, int flags) | |
370 | { | |
371 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
372 | struct sock *sk = sock->sk; | |
373 | struct rxrpc_transport *trans; | |
374 | struct rxrpc_local *local; | |
375 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
376 | int ret; | |
377 | ||
378 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
379 | ||
380 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
381 | if (ret < 0) { | |
382 | _leave(" = %d [bad addr]", ret); | |
383 | return ret; | |
384 | } | |
385 | ||
386 | lock_sock(&rx->sk); | |
387 | ||
388 | switch (rx->sk.sk_state) { | |
389 | case RXRPC_UNCONNECTED: | |
390 | /* find a local transport endpoint if we don't have one already */ | |
391 | ASSERTCMP(rx->local, ==, NULL); | |
392 | rx->srx.srx_family = AF_RXRPC; | |
393 | rx->srx.srx_service = 0; | |
394 | rx->srx.transport_type = srx->transport_type; | |
395 | rx->srx.transport_len = sizeof(sa_family_t); | |
396 | rx->srx.transport.family = srx->transport.family; | |
397 | local = rxrpc_lookup_local(&rx->srx); | |
398 | if (IS_ERR(local)) { | |
399 | release_sock(&rx->sk); | |
400 | return PTR_ERR(local); | |
401 | } | |
402 | rx->local = local; | |
403 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
404 | case RXRPC_CLIENT_BOUND: | |
405 | break; | |
406 | case RXRPC_CLIENT_CONNECTED: | |
407 | release_sock(&rx->sk); | |
408 | return -EISCONN; | |
409 | default: | |
410 | release_sock(&rx->sk); | |
411 | return -EBUSY; /* server sockets can't connect as well */ | |
412 | } | |
413 | ||
651350d1 DH |
414 | trans = rxrpc_name_to_transport(sock, addr, addr_len, flags, |
415 | GFP_KERNEL); | |
17926a79 DH |
416 | if (IS_ERR(trans)) { |
417 | release_sock(&rx->sk); | |
418 | _leave(" = %ld", PTR_ERR(trans)); | |
419 | return PTR_ERR(trans); | |
420 | } | |
421 | ||
422 | rx->trans = trans; | |
423 | rx->service_id = htons(srx->srx_service); | |
424 | rx->sk.sk_state = RXRPC_CLIENT_CONNECTED; | |
425 | ||
426 | release_sock(&rx->sk); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | /* | |
431 | * send a message through an RxRPC socket | |
432 | * - in a client this does a number of things: | |
433 | * - finds/sets up a connection for the security specified (if any) | |
434 | * - initiates a call (ID in control data) | |
435 | * - ends the request phase of a call (if MSG_MORE is not set) | |
436 | * - sends a call data packet | |
437 | * - may send an abort (abort code in control data) | |
438 | */ | |
439 | static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock, | |
440 | struct msghdr *m, size_t len) | |
441 | { | |
442 | struct rxrpc_transport *trans; | |
443 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
444 | int ret; | |
445 | ||
446 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
447 | ||
448 | if (m->msg_flags & MSG_OOB) | |
449 | return -EOPNOTSUPP; | |
450 | ||
451 | if (m->msg_name) { | |
452 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
453 | if (ret < 0) { | |
454 | _leave(" = %d [bad addr]", ret); | |
455 | return ret; | |
456 | } | |
457 | } | |
458 | ||
459 | trans = NULL; | |
460 | lock_sock(&rx->sk); | |
461 | ||
462 | if (m->msg_name) { | |
463 | ret = -EISCONN; | |
464 | trans = rxrpc_name_to_transport(sock, m->msg_name, | |
651350d1 | 465 | m->msg_namelen, 0, GFP_KERNEL); |
17926a79 DH |
466 | if (IS_ERR(trans)) { |
467 | ret = PTR_ERR(trans); | |
468 | trans = NULL; | |
469 | goto out; | |
470 | } | |
471 | } else { | |
472 | trans = rx->trans; | |
473 | if (trans) | |
474 | atomic_inc(&trans->usage); | |
475 | } | |
476 | ||
477 | switch (rx->sk.sk_state) { | |
478 | case RXRPC_SERVER_LISTENING: | |
479 | if (!m->msg_name) { | |
480 | ret = rxrpc_server_sendmsg(iocb, rx, m, len); | |
481 | break; | |
482 | } | |
483 | case RXRPC_SERVER_BOUND: | |
484 | case RXRPC_CLIENT_BOUND: | |
485 | if (!m->msg_name) { | |
486 | ret = -ENOTCONN; | |
487 | break; | |
488 | } | |
489 | case RXRPC_CLIENT_CONNECTED: | |
490 | ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len); | |
491 | break; | |
492 | default: | |
493 | ret = -ENOTCONN; | |
494 | break; | |
495 | } | |
496 | ||
497 | out: | |
498 | release_sock(&rx->sk); | |
499 | if (trans) | |
500 | rxrpc_put_transport(trans); | |
501 | _leave(" = %d", ret); | |
502 | return ret; | |
503 | } | |
504 | ||
505 | /* | |
506 | * set RxRPC socket options | |
507 | */ | |
508 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
509 | char __user *optval, int optlen) | |
510 | { | |
511 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
512 | unsigned min_sec_level; | |
513 | int ret; | |
514 | ||
515 | _enter(",%d,%d,,%d", level, optname, optlen); | |
516 | ||
517 | lock_sock(&rx->sk); | |
518 | ret = -EOPNOTSUPP; | |
519 | ||
520 | if (level == SOL_RXRPC) { | |
521 | switch (optname) { | |
522 | case RXRPC_EXCLUSIVE_CONNECTION: | |
523 | ret = -EINVAL; | |
524 | if (optlen != 0) | |
525 | goto error; | |
526 | ret = -EISCONN; | |
527 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
528 | goto error; | |
529 | set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); | |
530 | goto success; | |
531 | ||
532 | case RXRPC_SECURITY_KEY: | |
533 | ret = -EINVAL; | |
534 | if (rx->key) | |
535 | goto error; | |
536 | ret = -EISCONN; | |
537 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
538 | goto error; | |
539 | ret = rxrpc_request_key(rx, optval, optlen); | |
540 | goto error; | |
541 | ||
542 | case RXRPC_SECURITY_KEYRING: | |
543 | ret = -EINVAL; | |
544 | if (rx->key) | |
545 | goto error; | |
546 | ret = -EISCONN; | |
547 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
548 | goto error; | |
549 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
550 | goto error; | |
551 | ||
552 | case RXRPC_MIN_SECURITY_LEVEL: | |
553 | ret = -EINVAL; | |
554 | if (optlen != sizeof(unsigned)) | |
555 | goto error; | |
556 | ret = -EISCONN; | |
557 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
558 | goto error; | |
559 | ret = get_user(min_sec_level, | |
560 | (unsigned __user *) optval); | |
561 | if (ret < 0) | |
562 | goto error; | |
563 | ret = -EINVAL; | |
564 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
565 | goto error; | |
566 | rx->min_sec_level = min_sec_level; | |
567 | goto success; | |
568 | ||
569 | default: | |
570 | break; | |
571 | } | |
572 | } | |
573 | ||
574 | success: | |
575 | ret = 0; | |
576 | error: | |
577 | release_sock(&rx->sk); | |
578 | return ret; | |
579 | } | |
580 | ||
581 | /* | |
582 | * permit an RxRPC socket to be polled | |
583 | */ | |
584 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
585 | poll_table *wait) | |
586 | { | |
587 | unsigned int mask; | |
588 | struct sock *sk = sock->sk; | |
589 | ||
590 | poll_wait(file, sk->sk_sleep, wait); | |
591 | mask = 0; | |
592 | ||
593 | /* the socket is readable if there are any messages waiting on the Rx | |
594 | * queue */ | |
595 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
596 | mask |= POLLIN | POLLRDNORM; | |
597 | ||
598 | /* the socket is writable if there is space to add new data to the | |
599 | * socket; there is no guarantee that any particular call in progress | |
600 | * on the socket may have space in the Tx ACK window */ | |
601 | if (rxrpc_writable(sk)) | |
602 | mask |= POLLOUT | POLLWRNORM; | |
603 | ||
604 | return mask; | |
605 | } | |
606 | ||
607 | /* | |
608 | * create an RxRPC socket | |
609 | */ | |
1b8d7ae4 | 610 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol) |
17926a79 DH |
611 | { |
612 | struct rxrpc_sock *rx; | |
613 | struct sock *sk; | |
614 | ||
615 | _enter("%p,%d", sock, protocol); | |
616 | ||
1b8d7ae4 EB |
617 | if (net != &init_net) |
618 | return -EAFNOSUPPORT; | |
619 | ||
17926a79 DH |
620 | /* we support transport protocol UDP only */ |
621 | if (protocol != PF_INET) | |
622 | return -EPROTONOSUPPORT; | |
623 | ||
624 | if (sock->type != SOCK_DGRAM) | |
625 | return -ESOCKTNOSUPPORT; | |
626 | ||
627 | sock->ops = &rxrpc_rpc_ops; | |
628 | sock->state = SS_UNCONNECTED; | |
629 | ||
6257ff21 | 630 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto); |
17926a79 DH |
631 | if (!sk) |
632 | return -ENOMEM; | |
633 | ||
634 | sock_init_data(sock, sk); | |
635 | sk->sk_state = RXRPC_UNCONNECTED; | |
636 | sk->sk_write_space = rxrpc_write_space; | |
637 | sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen; | |
638 | sk->sk_destruct = rxrpc_sock_destructor; | |
639 | ||
640 | rx = rxrpc_sk(sk); | |
641 | rx->proto = protocol; | |
642 | rx->calls = RB_ROOT; | |
643 | ||
644 | INIT_LIST_HEAD(&rx->listen_link); | |
645 | INIT_LIST_HEAD(&rx->secureq); | |
646 | INIT_LIST_HEAD(&rx->acceptq); | |
647 | rwlock_init(&rx->call_lock); | |
648 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
649 | ||
650 | _leave(" = 0 [%p]", rx); | |
651 | return 0; | |
652 | } | |
653 | ||
654 | /* | |
655 | * RxRPC socket destructor | |
656 | */ | |
657 | static void rxrpc_sock_destructor(struct sock *sk) | |
658 | { | |
659 | _enter("%p", sk); | |
660 | ||
661 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
662 | ||
547b792c IJ |
663 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
664 | WARN_ON(!sk_unhashed(sk)); | |
665 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
666 | |
667 | if (!sock_flag(sk, SOCK_DEAD)) { | |
668 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
669 | return; | |
670 | } | |
671 | } | |
672 | ||
673 | /* | |
674 | * release an RxRPC socket | |
675 | */ | |
676 | static int rxrpc_release_sock(struct sock *sk) | |
677 | { | |
678 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
679 | ||
680 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
681 | ||
682 | /* declare the socket closed for business */ | |
683 | sock_orphan(sk); | |
684 | sk->sk_shutdown = SHUTDOWN_MASK; | |
685 | ||
686 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
687 | sk->sk_state = RXRPC_CLOSE; | |
688 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
689 | ||
690 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
691 | ||
692 | if (!list_empty(&rx->listen_link)) { | |
693 | write_lock_bh(&rx->local->services_lock); | |
694 | list_del(&rx->listen_link); | |
695 | write_unlock_bh(&rx->local->services_lock); | |
696 | } | |
697 | ||
698 | /* try to flush out this socket */ | |
699 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 700 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
701 | rxrpc_purge_queue(&sk->sk_receive_queue); |
702 | ||
703 | if (rx->conn) { | |
704 | rxrpc_put_connection(rx->conn); | |
705 | rx->conn = NULL; | |
706 | } | |
707 | ||
708 | if (rx->bundle) { | |
709 | rxrpc_put_bundle(rx->trans, rx->bundle); | |
710 | rx->bundle = NULL; | |
711 | } | |
712 | if (rx->trans) { | |
713 | rxrpc_put_transport(rx->trans); | |
714 | rx->trans = NULL; | |
715 | } | |
716 | if (rx->local) { | |
717 | rxrpc_put_local(rx->local); | |
718 | rx->local = NULL; | |
719 | } | |
720 | ||
721 | key_put(rx->key); | |
722 | rx->key = NULL; | |
723 | key_put(rx->securities); | |
724 | rx->securities = NULL; | |
725 | sock_put(sk); | |
726 | ||
727 | _leave(" = 0"); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | /* | |
732 | * release an RxRPC BSD socket on close() or equivalent | |
733 | */ | |
734 | static int rxrpc_release(struct socket *sock) | |
735 | { | |
736 | struct sock *sk = sock->sk; | |
737 | ||
738 | _enter("%p{%p}", sock, sk); | |
739 | ||
740 | if (!sk) | |
741 | return 0; | |
742 | ||
743 | sock->sk = NULL; | |
744 | ||
745 | return rxrpc_release_sock(sk); | |
746 | } | |
747 | ||
748 | /* | |
749 | * RxRPC network protocol | |
750 | */ | |
751 | static const struct proto_ops rxrpc_rpc_ops = { | |
752 | .family = PF_UNIX, | |
753 | .owner = THIS_MODULE, | |
754 | .release = rxrpc_release, | |
755 | .bind = rxrpc_bind, | |
756 | .connect = rxrpc_connect, | |
757 | .socketpair = sock_no_socketpair, | |
758 | .accept = sock_no_accept, | |
759 | .getname = sock_no_getname, | |
760 | .poll = rxrpc_poll, | |
761 | .ioctl = sock_no_ioctl, | |
762 | .listen = rxrpc_listen, | |
763 | .shutdown = sock_no_shutdown, | |
764 | .setsockopt = rxrpc_setsockopt, | |
765 | .getsockopt = sock_no_getsockopt, | |
766 | .sendmsg = rxrpc_sendmsg, | |
767 | .recvmsg = rxrpc_recvmsg, | |
768 | .mmap = sock_no_mmap, | |
769 | .sendpage = sock_no_sendpage, | |
770 | }; | |
771 | ||
772 | static struct proto rxrpc_proto = { | |
773 | .name = "RXRPC", | |
774 | .owner = THIS_MODULE, | |
775 | .obj_size = sizeof(struct rxrpc_sock), | |
776 | .max_header = sizeof(struct rxrpc_header), | |
777 | }; | |
778 | ||
779 | static struct net_proto_family rxrpc_family_ops = { | |
780 | .family = PF_RXRPC, | |
781 | .create = rxrpc_create, | |
782 | .owner = THIS_MODULE, | |
783 | }; | |
784 | ||
785 | /* | |
786 | * initialise and register the RxRPC protocol | |
787 | */ | |
788 | static int __init af_rxrpc_init(void) | |
789 | { | |
790 | struct sk_buff *dummy_skb; | |
791 | int ret = -1; | |
792 | ||
793 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb)); | |
794 | ||
2c6b47de | 795 | rxrpc_epoch = htonl(get_seconds()); |
17926a79 | 796 | |
651350d1 | 797 | ret = -ENOMEM; |
17926a79 DH |
798 | rxrpc_call_jar = kmem_cache_create( |
799 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 800 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 DH |
801 | if (!rxrpc_call_jar) { |
802 | printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n"); | |
17926a79 DH |
803 | goto error_call_jar; |
804 | } | |
805 | ||
651350d1 DH |
806 | rxrpc_workqueue = create_workqueue("krxrpcd"); |
807 | if (!rxrpc_workqueue) { | |
808 | printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n"); | |
809 | goto error_work_queue; | |
810 | } | |
811 | ||
17926a79 | 812 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 YH |
813 | if (ret < 0) { |
814 | printk(KERN_CRIT "RxRPC: Cannot register protocol\n"); | |
17926a79 DH |
815 | goto error_proto; |
816 | } | |
817 | ||
818 | ret = sock_register(&rxrpc_family_ops); | |
819 | if (ret < 0) { | |
1c899641 | 820 | printk(KERN_CRIT "RxRPC: Cannot register socket family\n"); |
17926a79 DH |
821 | goto error_sock; |
822 | } | |
823 | ||
824 | ret = register_key_type(&key_type_rxrpc); | |
825 | if (ret < 0) { | |
1c899641 | 826 | printk(KERN_CRIT "RxRPC: Cannot register client key type\n"); |
17926a79 DH |
827 | goto error_key_type; |
828 | } | |
829 | ||
830 | ret = register_key_type(&key_type_rxrpc_s); | |
831 | if (ret < 0) { | |
1c899641 | 832 | printk(KERN_CRIT "RxRPC: Cannot register server key type\n"); |
17926a79 DH |
833 | goto error_key_type_s; |
834 | } | |
835 | ||
836 | #ifdef CONFIG_PROC_FS | |
457c4cbc EB |
837 | proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops); |
838 | proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops); | |
17926a79 DH |
839 | #endif |
840 | return 0; | |
841 | ||
842 | error_key_type_s: | |
843 | unregister_key_type(&key_type_rxrpc); | |
844 | error_key_type: | |
845 | sock_unregister(PF_RXRPC); | |
846 | error_sock: | |
847 | proto_unregister(&rxrpc_proto); | |
848 | error_proto: | |
651350d1 DH |
849 | destroy_workqueue(rxrpc_workqueue); |
850 | error_work_queue: | |
17926a79 DH |
851 | kmem_cache_destroy(rxrpc_call_jar); |
852 | error_call_jar: | |
853 | return ret; | |
854 | } | |
855 | ||
856 | /* | |
857 | * unregister the RxRPC protocol | |
858 | */ | |
859 | static void __exit af_rxrpc_exit(void) | |
860 | { | |
861 | _enter(""); | |
862 | unregister_key_type(&key_type_rxrpc_s); | |
863 | unregister_key_type(&key_type_rxrpc); | |
864 | sock_unregister(PF_RXRPC); | |
865 | proto_unregister(&rxrpc_proto); | |
866 | rxrpc_destroy_all_calls(); | |
867 | rxrpc_destroy_all_connections(); | |
868 | rxrpc_destroy_all_transports(); | |
869 | rxrpc_destroy_all_peers(); | |
870 | rxrpc_destroy_all_locals(); | |
871 | ||
872 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
873 | ||
874 | _debug("flush scheduled work"); | |
651350d1 | 875 | flush_workqueue(rxrpc_workqueue); |
457c4cbc EB |
876 | proc_net_remove(&init_net, "rxrpc_conns"); |
877 | proc_net_remove(&init_net, "rxrpc_calls"); | |
651350d1 | 878 | destroy_workqueue(rxrpc_workqueue); |
17926a79 DH |
879 | kmem_cache_destroy(rxrpc_call_jar); |
880 | _leave(""); | |
881 | } | |
882 | ||
883 | module_init(af_rxrpc_init); | |
884 | module_exit(af_rxrpc_exit); |