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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
17926a79 DH |
15 | #include <linux/skbuff.h> |
16 | #include <linux/poll.h> | |
17 | #include <linux/proc_fs.h> | |
76181c13 | 18 | #include <linux/key-type.h> |
457c4cbc | 19 | #include <net/net_namespace.h> |
17926a79 DH |
20 | #include <net/sock.h> |
21 | #include <net/af_rxrpc.h> | |
22 | #include "ar-internal.h" | |
23 | ||
24 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
25 | MODULE_AUTHOR("Red Hat, Inc."); | |
26 | MODULE_LICENSE("GPL"); | |
27 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
28 | ||
29 | unsigned rxrpc_debug; // = RXRPC_DEBUG_KPROTO; | |
30 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); | |
424b00e2 | 31 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 DH |
32 | |
33 | static int sysctl_rxrpc_max_qlen __read_mostly = 10; | |
34 | ||
35 | static struct proto rxrpc_proto; | |
36 | static const struct proto_ops rxrpc_rpc_ops; | |
37 | ||
38 | /* local epoch for detecting local-end reset */ | |
39 | __be32 rxrpc_epoch; | |
40 | ||
41 | /* current debugging ID */ | |
42 | atomic_t rxrpc_debug_id; | |
43 | ||
44 | /* count of skbs currently in use */ | |
45 | atomic_t rxrpc_n_skbs; | |
46 | ||
651350d1 DH |
47 | struct workqueue_struct *rxrpc_workqueue; |
48 | ||
17926a79 DH |
49 | static void rxrpc_sock_destructor(struct sock *); |
50 | ||
51 | /* | |
52 | * see if an RxRPC socket is currently writable | |
53 | */ | |
54 | static inline int rxrpc_writable(struct sock *sk) | |
55 | { | |
56 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
57 | } | |
58 | ||
59 | /* | |
60 | * wait for write bufferage to become available | |
61 | */ | |
62 | static void rxrpc_write_space(struct sock *sk) | |
63 | { | |
64 | _enter("%p", sk); | |
65 | read_lock(&sk->sk_callback_lock); | |
66 | if (rxrpc_writable(sk)) { | |
a57de0b4 | 67 | if (sk_has_sleeper(sk)) |
aa395145 | 68 | wake_up_interruptible(sk_sleep(sk)); |
8d8ad9d7 | 69 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 DH |
70 | } |
71 | read_unlock(&sk->sk_callback_lock); | |
72 | } | |
73 | ||
74 | /* | |
75 | * validate an RxRPC address | |
76 | */ | |
77 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
78 | struct sockaddr_rxrpc *srx, | |
79 | int len) | |
80 | { | |
81 | if (len < sizeof(struct sockaddr_rxrpc)) | |
82 | return -EINVAL; | |
83 | ||
84 | if (srx->srx_family != AF_RXRPC) | |
85 | return -EAFNOSUPPORT; | |
86 | ||
87 | if (srx->transport_type != SOCK_DGRAM) | |
88 | return -ESOCKTNOSUPPORT; | |
89 | ||
90 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
91 | if (srx->transport_len < sizeof(sa_family_t) || | |
92 | srx->transport_len > len) | |
93 | return -EINVAL; | |
94 | ||
95 | if (srx->transport.family != rx->proto) | |
96 | return -EAFNOSUPPORT; | |
97 | ||
98 | switch (srx->transport.family) { | |
99 | case AF_INET: | |
21454aaa | 100 | _debug("INET: %x @ %pI4", |
17926a79 | 101 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 102 | &srx->transport.sin.sin_addr); |
17926a79 DH |
103 | if (srx->transport_len > 8) |
104 | memset((void *)&srx->transport + 8, 0, | |
105 | srx->transport_len - 8); | |
106 | break; | |
107 | ||
108 | case AF_INET6: | |
109 | default: | |
110 | return -EAFNOSUPPORT; | |
111 | } | |
112 | ||
113 | return 0; | |
114 | } | |
115 | ||
116 | /* | |
117 | * bind a local address to an RxRPC socket | |
118 | */ | |
119 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
120 | { | |
121 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr; | |
122 | struct sock *sk = sock->sk; | |
123 | struct rxrpc_local *local; | |
124 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
125 | __be16 service_id; | |
126 | int ret; | |
127 | ||
128 | _enter("%p,%p,%d", rx, saddr, len); | |
129 | ||
130 | ret = rxrpc_validate_address(rx, srx, len); | |
131 | if (ret < 0) | |
132 | goto error; | |
133 | ||
134 | lock_sock(&rx->sk); | |
135 | ||
136 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) { | |
137 | ret = -EINVAL; | |
138 | goto error_unlock; | |
139 | } | |
140 | ||
141 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
142 | ||
143 | /* find a local transport endpoint if we don't have one already */ | |
144 | local = rxrpc_lookup_local(&rx->srx); | |
145 | if (IS_ERR(local)) { | |
146 | ret = PTR_ERR(local); | |
147 | goto error_unlock; | |
148 | } | |
149 | ||
150 | rx->local = local; | |
151 | if (srx->srx_service) { | |
152 | service_id = htons(srx->srx_service); | |
153 | write_lock_bh(&local->services_lock); | |
154 | list_for_each_entry(prx, &local->services, listen_link) { | |
155 | if (prx->service_id == service_id) | |
156 | goto service_in_use; | |
157 | } | |
158 | ||
159 | rx->service_id = service_id; | |
160 | list_add_tail(&rx->listen_link, &local->services); | |
161 | write_unlock_bh(&local->services_lock); | |
162 | ||
163 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
164 | } else { | |
165 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
166 | } | |
167 | ||
168 | release_sock(&rx->sk); | |
169 | _leave(" = 0"); | |
170 | return 0; | |
171 | ||
172 | service_in_use: | |
173 | ret = -EADDRINUSE; | |
174 | write_unlock_bh(&local->services_lock); | |
175 | error_unlock: | |
176 | release_sock(&rx->sk); | |
177 | error: | |
178 | _leave(" = %d", ret); | |
179 | return ret; | |
180 | } | |
181 | ||
182 | /* | |
183 | * set the number of pending calls permitted on a listening socket | |
184 | */ | |
185 | static int rxrpc_listen(struct socket *sock, int backlog) | |
186 | { | |
187 | struct sock *sk = sock->sk; | |
188 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
189 | int ret; | |
190 | ||
191 | _enter("%p,%d", rx, backlog); | |
192 | ||
193 | lock_sock(&rx->sk); | |
194 | ||
195 | switch (rx->sk.sk_state) { | |
196 | case RXRPC_UNCONNECTED: | |
197 | ret = -EADDRNOTAVAIL; | |
198 | break; | |
199 | case RXRPC_CLIENT_BOUND: | |
200 | case RXRPC_CLIENT_CONNECTED: | |
201 | default: | |
202 | ret = -EBUSY; | |
203 | break; | |
204 | case RXRPC_SERVER_BOUND: | |
205 | ASSERT(rx->local != NULL); | |
206 | sk->sk_max_ack_backlog = backlog; | |
207 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
208 | ret = 0; | |
209 | break; | |
210 | } | |
211 | ||
212 | release_sock(&rx->sk); | |
213 | _leave(" = %d", ret); | |
214 | return ret; | |
215 | } | |
216 | ||
217 | /* | |
218 | * find a transport by address | |
219 | */ | |
220 | static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock, | |
221 | struct sockaddr *addr, | |
651350d1 DH |
222 | int addr_len, int flags, |
223 | gfp_t gfp) | |
17926a79 DH |
224 | { |
225 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
226 | struct rxrpc_transport *trans; | |
227 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
228 | struct rxrpc_peer *peer; | |
229 | ||
230 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
231 | ||
232 | ASSERT(rx->local != NULL); | |
233 | ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED); | |
234 | ||
235 | if (rx->srx.transport_type != srx->transport_type) | |
236 | return ERR_PTR(-ESOCKTNOSUPPORT); | |
237 | if (rx->srx.transport.family != srx->transport.family) | |
238 | return ERR_PTR(-EAFNOSUPPORT); | |
239 | ||
240 | /* find a remote transport endpoint from the local one */ | |
651350d1 | 241 | peer = rxrpc_get_peer(srx, gfp); |
17926a79 | 242 | if (IS_ERR(peer)) |
e231c2ee | 243 | return ERR_CAST(peer); |
17926a79 DH |
244 | |
245 | /* find a transport */ | |
651350d1 | 246 | trans = rxrpc_get_transport(rx->local, peer, gfp); |
17926a79 DH |
247 | rxrpc_put_peer(peer); |
248 | _leave(" = %p", trans); | |
249 | return trans; | |
250 | } | |
251 | ||
651350d1 DH |
252 | /** |
253 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
254 | * @sock: The socket on which to make the call | |
255 | * @srx: The address of the peer to contact (defaults to socket setting) | |
256 | * @key: The security context to use (defaults to socket setting) | |
257 | * @user_call_ID: The ID to use | |
258 | * | |
259 | * Allow a kernel service to begin a call on the nominated socket. This just | |
260 | * sets up all the internal tracking structures and allocates connection and | |
261 | * call IDs as appropriate. The call to be used is returned. | |
262 | * | |
263 | * The default socket destination address and security may be overridden by | |
264 | * supplying @srx and @key. | |
265 | */ | |
266 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
267 | struct sockaddr_rxrpc *srx, | |
268 | struct key *key, | |
269 | unsigned long user_call_ID, | |
270 | gfp_t gfp) | |
271 | { | |
272 | struct rxrpc_conn_bundle *bundle; | |
273 | struct rxrpc_transport *trans; | |
274 | struct rxrpc_call *call; | |
275 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
276 | __be16 service_id; | |
277 | ||
278 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
279 | ||
280 | lock_sock(&rx->sk); | |
281 | ||
282 | if (srx) { | |
283 | trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx, | |
284 | sizeof(*srx), 0, gfp); | |
285 | if (IS_ERR(trans)) { | |
e231c2ee | 286 | call = ERR_CAST(trans); |
651350d1 | 287 | trans = NULL; |
15bde727 | 288 | goto out_notrans; |
651350d1 DH |
289 | } |
290 | } else { | |
291 | trans = rx->trans; | |
292 | if (!trans) { | |
293 | call = ERR_PTR(-ENOTCONN); | |
15bde727 | 294 | goto out_notrans; |
651350d1 DH |
295 | } |
296 | atomic_inc(&trans->usage); | |
297 | } | |
298 | ||
299 | service_id = rx->service_id; | |
300 | if (srx) | |
301 | service_id = htons(srx->srx_service); | |
302 | ||
303 | if (!key) | |
304 | key = rx->key; | |
305 | if (key && !key->payload.data) | |
306 | key = NULL; /* a no-security key */ | |
307 | ||
308 | bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp); | |
309 | if (IS_ERR(bundle)) { | |
e231c2ee | 310 | call = ERR_CAST(bundle); |
651350d1 DH |
311 | goto out; |
312 | } | |
313 | ||
314 | call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true, | |
315 | gfp); | |
316 | rxrpc_put_bundle(trans, bundle); | |
317 | out: | |
318 | rxrpc_put_transport(trans); | |
15bde727 | 319 | out_notrans: |
651350d1 DH |
320 | release_sock(&rx->sk); |
321 | _leave(" = %p", call); | |
322 | return call; | |
323 | } | |
324 | ||
325 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); | |
326 | ||
327 | /** | |
328 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
329 | * @call: The call to end | |
330 | * | |
331 | * Allow a kernel service to end a call it was using. The call must be | |
332 | * complete before this is called (the call should be aborted if necessary). | |
333 | */ | |
334 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
335 | { | |
336 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
337 | rxrpc_remove_user_ID(call->socket, call); | |
338 | rxrpc_put_call(call); | |
339 | } | |
340 | ||
341 | EXPORT_SYMBOL(rxrpc_kernel_end_call); | |
342 | ||
343 | /** | |
344 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
345 | * @sock: The socket to intercept received messages on | |
346 | * @interceptor: The function to pass the messages to | |
347 | * | |
348 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
349 | * RxRPC socket. They get passed to the specified function instead. | |
350 | * @interceptor should free the socket buffers it is given. @interceptor is | |
351 | * called with the socket receive queue spinlock held and softirqs disabled - | |
352 | * this ensures that the messages will be delivered in the right order. | |
353 | */ | |
354 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
355 | rxrpc_interceptor_t interceptor) | |
356 | { | |
357 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
358 | ||
359 | _enter(""); | |
360 | rx->interceptor = interceptor; | |
361 | } | |
362 | ||
363 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
364 | ||
17926a79 DH |
365 | /* |
366 | * connect an RxRPC socket | |
367 | * - this just targets it at a specific destination; no actual connection | |
368 | * negotiation takes place | |
369 | */ | |
370 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
371 | int addr_len, int flags) | |
372 | { | |
373 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
374 | struct sock *sk = sock->sk; | |
375 | struct rxrpc_transport *trans; | |
376 | struct rxrpc_local *local; | |
377 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
378 | int ret; | |
379 | ||
380 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
381 | ||
382 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
383 | if (ret < 0) { | |
384 | _leave(" = %d [bad addr]", ret); | |
385 | return ret; | |
386 | } | |
387 | ||
388 | lock_sock(&rx->sk); | |
389 | ||
390 | switch (rx->sk.sk_state) { | |
391 | case RXRPC_UNCONNECTED: | |
392 | /* find a local transport endpoint if we don't have one already */ | |
393 | ASSERTCMP(rx->local, ==, NULL); | |
394 | rx->srx.srx_family = AF_RXRPC; | |
395 | rx->srx.srx_service = 0; | |
396 | rx->srx.transport_type = srx->transport_type; | |
397 | rx->srx.transport_len = sizeof(sa_family_t); | |
398 | rx->srx.transport.family = srx->transport.family; | |
399 | local = rxrpc_lookup_local(&rx->srx); | |
400 | if (IS_ERR(local)) { | |
401 | release_sock(&rx->sk); | |
402 | return PTR_ERR(local); | |
403 | } | |
404 | rx->local = local; | |
405 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
406 | case RXRPC_CLIENT_BOUND: | |
407 | break; | |
408 | case RXRPC_CLIENT_CONNECTED: | |
409 | release_sock(&rx->sk); | |
410 | return -EISCONN; | |
411 | default: | |
412 | release_sock(&rx->sk); | |
413 | return -EBUSY; /* server sockets can't connect as well */ | |
414 | } | |
415 | ||
651350d1 DH |
416 | trans = rxrpc_name_to_transport(sock, addr, addr_len, flags, |
417 | GFP_KERNEL); | |
17926a79 DH |
418 | if (IS_ERR(trans)) { |
419 | release_sock(&rx->sk); | |
420 | _leave(" = %ld", PTR_ERR(trans)); | |
421 | return PTR_ERR(trans); | |
422 | } | |
423 | ||
424 | rx->trans = trans; | |
425 | rx->service_id = htons(srx->srx_service); | |
426 | rx->sk.sk_state = RXRPC_CLIENT_CONNECTED; | |
427 | ||
428 | release_sock(&rx->sk); | |
429 | return 0; | |
430 | } | |
431 | ||
432 | /* | |
433 | * send a message through an RxRPC socket | |
434 | * - in a client this does a number of things: | |
435 | * - finds/sets up a connection for the security specified (if any) | |
436 | * - initiates a call (ID in control data) | |
437 | * - ends the request phase of a call (if MSG_MORE is not set) | |
438 | * - sends a call data packet | |
439 | * - may send an abort (abort code in control data) | |
440 | */ | |
441 | static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock, | |
442 | struct msghdr *m, size_t len) | |
443 | { | |
444 | struct rxrpc_transport *trans; | |
445 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
446 | int ret; | |
447 | ||
448 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
449 | ||
450 | if (m->msg_flags & MSG_OOB) | |
451 | return -EOPNOTSUPP; | |
452 | ||
453 | if (m->msg_name) { | |
454 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
455 | if (ret < 0) { | |
456 | _leave(" = %d [bad addr]", ret); | |
457 | return ret; | |
458 | } | |
459 | } | |
460 | ||
461 | trans = NULL; | |
462 | lock_sock(&rx->sk); | |
463 | ||
464 | if (m->msg_name) { | |
465 | ret = -EISCONN; | |
466 | trans = rxrpc_name_to_transport(sock, m->msg_name, | |
651350d1 | 467 | m->msg_namelen, 0, GFP_KERNEL); |
17926a79 DH |
468 | if (IS_ERR(trans)) { |
469 | ret = PTR_ERR(trans); | |
470 | trans = NULL; | |
471 | goto out; | |
472 | } | |
473 | } else { | |
474 | trans = rx->trans; | |
475 | if (trans) | |
476 | atomic_inc(&trans->usage); | |
477 | } | |
478 | ||
479 | switch (rx->sk.sk_state) { | |
480 | case RXRPC_SERVER_LISTENING: | |
481 | if (!m->msg_name) { | |
482 | ret = rxrpc_server_sendmsg(iocb, rx, m, len); | |
483 | break; | |
484 | } | |
485 | case RXRPC_SERVER_BOUND: | |
486 | case RXRPC_CLIENT_BOUND: | |
487 | if (!m->msg_name) { | |
488 | ret = -ENOTCONN; | |
489 | break; | |
490 | } | |
491 | case RXRPC_CLIENT_CONNECTED: | |
492 | ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len); | |
493 | break; | |
494 | default: | |
495 | ret = -ENOTCONN; | |
496 | break; | |
497 | } | |
498 | ||
499 | out: | |
500 | release_sock(&rx->sk); | |
501 | if (trans) | |
502 | rxrpc_put_transport(trans); | |
503 | _leave(" = %d", ret); | |
504 | return ret; | |
505 | } | |
506 | ||
507 | /* | |
508 | * set RxRPC socket options | |
509 | */ | |
510 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 511 | char __user *optval, unsigned int optlen) |
17926a79 DH |
512 | { |
513 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
514 | unsigned min_sec_level; | |
515 | int ret; | |
516 | ||
517 | _enter(",%d,%d,,%d", level, optname, optlen); | |
518 | ||
519 | lock_sock(&rx->sk); | |
520 | ret = -EOPNOTSUPP; | |
521 | ||
522 | if (level == SOL_RXRPC) { | |
523 | switch (optname) { | |
524 | case RXRPC_EXCLUSIVE_CONNECTION: | |
525 | ret = -EINVAL; | |
526 | if (optlen != 0) | |
527 | goto error; | |
528 | ret = -EISCONN; | |
529 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
530 | goto error; | |
531 | set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); | |
532 | goto success; | |
533 | ||
534 | case RXRPC_SECURITY_KEY: | |
535 | ret = -EINVAL; | |
536 | if (rx->key) | |
537 | goto error; | |
538 | ret = -EISCONN; | |
539 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
540 | goto error; | |
541 | ret = rxrpc_request_key(rx, optval, optlen); | |
542 | goto error; | |
543 | ||
544 | case RXRPC_SECURITY_KEYRING: | |
545 | ret = -EINVAL; | |
546 | if (rx->key) | |
547 | goto error; | |
548 | ret = -EISCONN; | |
549 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
550 | goto error; | |
551 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
552 | goto error; | |
553 | ||
554 | case RXRPC_MIN_SECURITY_LEVEL: | |
555 | ret = -EINVAL; | |
556 | if (optlen != sizeof(unsigned)) | |
557 | goto error; | |
558 | ret = -EISCONN; | |
559 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
560 | goto error; | |
561 | ret = get_user(min_sec_level, | |
562 | (unsigned __user *) optval); | |
563 | if (ret < 0) | |
564 | goto error; | |
565 | ret = -EINVAL; | |
566 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
567 | goto error; | |
568 | rx->min_sec_level = min_sec_level; | |
569 | goto success; | |
570 | ||
571 | default: | |
572 | break; | |
573 | } | |
574 | } | |
575 | ||
576 | success: | |
577 | ret = 0; | |
578 | error: | |
579 | release_sock(&rx->sk); | |
580 | return ret; | |
581 | } | |
582 | ||
583 | /* | |
584 | * permit an RxRPC socket to be polled | |
585 | */ | |
586 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
587 | poll_table *wait) | |
588 | { | |
589 | unsigned int mask; | |
590 | struct sock *sk = sock->sk; | |
591 | ||
aa395145 | 592 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
593 | mask = 0; |
594 | ||
595 | /* the socket is readable if there are any messages waiting on the Rx | |
596 | * queue */ | |
597 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
598 | mask |= POLLIN | POLLRDNORM; | |
599 | ||
600 | /* the socket is writable if there is space to add new data to the | |
601 | * socket; there is no guarantee that any particular call in progress | |
602 | * on the socket may have space in the Tx ACK window */ | |
603 | if (rxrpc_writable(sk)) | |
604 | mask |= POLLOUT | POLLWRNORM; | |
605 | ||
606 | return mask; | |
607 | } | |
608 | ||
609 | /* | |
610 | * create an RxRPC socket | |
611 | */ | |
3f378b68 EP |
612 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
613 | int kern) | |
17926a79 DH |
614 | { |
615 | struct rxrpc_sock *rx; | |
616 | struct sock *sk; | |
617 | ||
618 | _enter("%p,%d", sock, protocol); | |
619 | ||
09ad9bc7 | 620 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
621 | return -EAFNOSUPPORT; |
622 | ||
17926a79 DH |
623 | /* we support transport protocol UDP only */ |
624 | if (protocol != PF_INET) | |
625 | return -EPROTONOSUPPORT; | |
626 | ||
627 | if (sock->type != SOCK_DGRAM) | |
628 | return -ESOCKTNOSUPPORT; | |
629 | ||
630 | sock->ops = &rxrpc_rpc_ops; | |
631 | sock->state = SS_UNCONNECTED; | |
632 | ||
6257ff21 | 633 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto); |
17926a79 DH |
634 | if (!sk) |
635 | return -ENOMEM; | |
636 | ||
637 | sock_init_data(sock, sk); | |
638 | sk->sk_state = RXRPC_UNCONNECTED; | |
639 | sk->sk_write_space = rxrpc_write_space; | |
640 | sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen; | |
641 | sk->sk_destruct = rxrpc_sock_destructor; | |
642 | ||
643 | rx = rxrpc_sk(sk); | |
644 | rx->proto = protocol; | |
645 | rx->calls = RB_ROOT; | |
646 | ||
647 | INIT_LIST_HEAD(&rx->listen_link); | |
648 | INIT_LIST_HEAD(&rx->secureq); | |
649 | INIT_LIST_HEAD(&rx->acceptq); | |
650 | rwlock_init(&rx->call_lock); | |
651 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
652 | ||
653 | _leave(" = 0 [%p]", rx); | |
654 | return 0; | |
655 | } | |
656 | ||
657 | /* | |
658 | * RxRPC socket destructor | |
659 | */ | |
660 | static void rxrpc_sock_destructor(struct sock *sk) | |
661 | { | |
662 | _enter("%p", sk); | |
663 | ||
664 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
665 | ||
547b792c IJ |
666 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
667 | WARN_ON(!sk_unhashed(sk)); | |
668 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
669 | |
670 | if (!sock_flag(sk, SOCK_DEAD)) { | |
671 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
672 | return; | |
673 | } | |
674 | } | |
675 | ||
676 | /* | |
677 | * release an RxRPC socket | |
678 | */ | |
679 | static int rxrpc_release_sock(struct sock *sk) | |
680 | { | |
681 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
682 | ||
683 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
684 | ||
685 | /* declare the socket closed for business */ | |
686 | sock_orphan(sk); | |
687 | sk->sk_shutdown = SHUTDOWN_MASK; | |
688 | ||
689 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
690 | sk->sk_state = RXRPC_CLOSE; | |
691 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
692 | ||
693 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
694 | ||
695 | if (!list_empty(&rx->listen_link)) { | |
696 | write_lock_bh(&rx->local->services_lock); | |
697 | list_del(&rx->listen_link); | |
698 | write_unlock_bh(&rx->local->services_lock); | |
699 | } | |
700 | ||
701 | /* try to flush out this socket */ | |
702 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 703 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
704 | rxrpc_purge_queue(&sk->sk_receive_queue); |
705 | ||
706 | if (rx->conn) { | |
707 | rxrpc_put_connection(rx->conn); | |
708 | rx->conn = NULL; | |
709 | } | |
710 | ||
711 | if (rx->bundle) { | |
712 | rxrpc_put_bundle(rx->trans, rx->bundle); | |
713 | rx->bundle = NULL; | |
714 | } | |
715 | if (rx->trans) { | |
716 | rxrpc_put_transport(rx->trans); | |
717 | rx->trans = NULL; | |
718 | } | |
719 | if (rx->local) { | |
720 | rxrpc_put_local(rx->local); | |
721 | rx->local = NULL; | |
722 | } | |
723 | ||
724 | key_put(rx->key); | |
725 | rx->key = NULL; | |
726 | key_put(rx->securities); | |
727 | rx->securities = NULL; | |
728 | sock_put(sk); | |
729 | ||
730 | _leave(" = 0"); | |
731 | return 0; | |
732 | } | |
733 | ||
734 | /* | |
735 | * release an RxRPC BSD socket on close() or equivalent | |
736 | */ | |
737 | static int rxrpc_release(struct socket *sock) | |
738 | { | |
739 | struct sock *sk = sock->sk; | |
740 | ||
741 | _enter("%p{%p}", sock, sk); | |
742 | ||
743 | if (!sk) | |
744 | return 0; | |
745 | ||
746 | sock->sk = NULL; | |
747 | ||
748 | return rxrpc_release_sock(sk); | |
749 | } | |
750 | ||
751 | /* | |
752 | * RxRPC network protocol | |
753 | */ | |
754 | static const struct proto_ops rxrpc_rpc_ops = { | |
755 | .family = PF_UNIX, | |
756 | .owner = THIS_MODULE, | |
757 | .release = rxrpc_release, | |
758 | .bind = rxrpc_bind, | |
759 | .connect = rxrpc_connect, | |
760 | .socketpair = sock_no_socketpair, | |
761 | .accept = sock_no_accept, | |
762 | .getname = sock_no_getname, | |
763 | .poll = rxrpc_poll, | |
764 | .ioctl = sock_no_ioctl, | |
765 | .listen = rxrpc_listen, | |
766 | .shutdown = sock_no_shutdown, | |
767 | .setsockopt = rxrpc_setsockopt, | |
768 | .getsockopt = sock_no_getsockopt, | |
769 | .sendmsg = rxrpc_sendmsg, | |
770 | .recvmsg = rxrpc_recvmsg, | |
771 | .mmap = sock_no_mmap, | |
772 | .sendpage = sock_no_sendpage, | |
773 | }; | |
774 | ||
775 | static struct proto rxrpc_proto = { | |
776 | .name = "RXRPC", | |
777 | .owner = THIS_MODULE, | |
778 | .obj_size = sizeof(struct rxrpc_sock), | |
779 | .max_header = sizeof(struct rxrpc_header), | |
780 | }; | |
781 | ||
ec1b4cf7 | 782 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
783 | .family = PF_RXRPC, |
784 | .create = rxrpc_create, | |
785 | .owner = THIS_MODULE, | |
786 | }; | |
787 | ||
788 | /* | |
789 | * initialise and register the RxRPC protocol | |
790 | */ | |
791 | static int __init af_rxrpc_init(void) | |
792 | { | |
793 | struct sk_buff *dummy_skb; | |
794 | int ret = -1; | |
795 | ||
796 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > sizeof(dummy_skb->cb)); | |
797 | ||
2c6b47de | 798 | rxrpc_epoch = htonl(get_seconds()); |
17926a79 | 799 | |
651350d1 | 800 | ret = -ENOMEM; |
17926a79 DH |
801 | rxrpc_call_jar = kmem_cache_create( |
802 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 803 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 DH |
804 | if (!rxrpc_call_jar) { |
805 | printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n"); | |
17926a79 DH |
806 | goto error_call_jar; |
807 | } | |
808 | ||
651350d1 DH |
809 | rxrpc_workqueue = create_workqueue("krxrpcd"); |
810 | if (!rxrpc_workqueue) { | |
811 | printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n"); | |
812 | goto error_work_queue; | |
813 | } | |
814 | ||
17926a79 | 815 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 YH |
816 | if (ret < 0) { |
817 | printk(KERN_CRIT "RxRPC: Cannot register protocol\n"); | |
17926a79 DH |
818 | goto error_proto; |
819 | } | |
820 | ||
821 | ret = sock_register(&rxrpc_family_ops); | |
822 | if (ret < 0) { | |
1c899641 | 823 | printk(KERN_CRIT "RxRPC: Cannot register socket family\n"); |
17926a79 DH |
824 | goto error_sock; |
825 | } | |
826 | ||
827 | ret = register_key_type(&key_type_rxrpc); | |
828 | if (ret < 0) { | |
1c899641 | 829 | printk(KERN_CRIT "RxRPC: Cannot register client key type\n"); |
17926a79 DH |
830 | goto error_key_type; |
831 | } | |
832 | ||
833 | ret = register_key_type(&key_type_rxrpc_s); | |
834 | if (ret < 0) { | |
1c899641 | 835 | printk(KERN_CRIT "RxRPC: Cannot register server key type\n"); |
17926a79 DH |
836 | goto error_key_type_s; |
837 | } | |
838 | ||
839 | #ifdef CONFIG_PROC_FS | |
457c4cbc EB |
840 | proc_net_fops_create(&init_net, "rxrpc_calls", 0, &rxrpc_call_seq_fops); |
841 | proc_net_fops_create(&init_net, "rxrpc_conns", 0, &rxrpc_connection_seq_fops); | |
17926a79 DH |
842 | #endif |
843 | return 0; | |
844 | ||
845 | error_key_type_s: | |
846 | unregister_key_type(&key_type_rxrpc); | |
847 | error_key_type: | |
848 | sock_unregister(PF_RXRPC); | |
849 | error_sock: | |
850 | proto_unregister(&rxrpc_proto); | |
851 | error_proto: | |
651350d1 DH |
852 | destroy_workqueue(rxrpc_workqueue); |
853 | error_work_queue: | |
17926a79 DH |
854 | kmem_cache_destroy(rxrpc_call_jar); |
855 | error_call_jar: | |
856 | return ret; | |
857 | } | |
858 | ||
859 | /* | |
860 | * unregister the RxRPC protocol | |
861 | */ | |
862 | static void __exit af_rxrpc_exit(void) | |
863 | { | |
864 | _enter(""); | |
865 | unregister_key_type(&key_type_rxrpc_s); | |
866 | unregister_key_type(&key_type_rxrpc); | |
867 | sock_unregister(PF_RXRPC); | |
868 | proto_unregister(&rxrpc_proto); | |
869 | rxrpc_destroy_all_calls(); | |
870 | rxrpc_destroy_all_connections(); | |
871 | rxrpc_destroy_all_transports(); | |
872 | rxrpc_destroy_all_peers(); | |
873 | rxrpc_destroy_all_locals(); | |
874 | ||
875 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
876 | ||
877 | _debug("flush scheduled work"); | |
651350d1 | 878 | flush_workqueue(rxrpc_workqueue); |
457c4cbc EB |
879 | proc_net_remove(&init_net, "rxrpc_conns"); |
880 | proc_net_remove(&init_net, "rxrpc_calls"); | |
651350d1 | 881 | destroy_workqueue(rxrpc_workqueue); |
17926a79 DH |
882 | kmem_cache_destroy(rxrpc_call_jar); |
883 | _leave(""); | |
884 | } | |
885 | ||
886 | module_init(af_rxrpc_init); | |
887 | module_exit(af_rxrpc_exit); |