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