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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> | |
ce6654cf | 13 | #include <linux/kernel.h> |
17926a79 | 14 | #include <linux/net.h> |
5a0e3ad6 | 15 | #include <linux/slab.h> |
17926a79 DH |
16 | #include <linux/skbuff.h> |
17 | #include <linux/poll.h> | |
18 | #include <linux/proc_fs.h> | |
76181c13 | 19 | #include <linux/key-type.h> |
457c4cbc | 20 | #include <net/net_namespace.h> |
17926a79 DH |
21 | #include <net/sock.h> |
22 | #include <net/af_rxrpc.h> | |
23 | #include "ar-internal.h" | |
24 | ||
25 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
26 | MODULE_AUTHOR("Red Hat, Inc."); | |
27 | MODULE_LICENSE("GPL"); | |
28 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
29 | ||
95c96174 | 30 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 31 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 32 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 DH |
33 | |
34 | static int sysctl_rxrpc_max_qlen __read_mostly = 10; | |
35 | ||
36 | static struct proto rxrpc_proto; | |
37 | static const struct proto_ops rxrpc_rpc_ops; | |
38 | ||
39 | /* local epoch for detecting local-end reset */ | |
40 | __be32 rxrpc_epoch; | |
41 | ||
42 | /* current debugging ID */ | |
43 | atomic_t rxrpc_debug_id; | |
44 | ||
45 | /* count of skbs currently in use */ | |
46 | atomic_t rxrpc_n_skbs; | |
47 | ||
651350d1 DH |
48 | struct workqueue_struct *rxrpc_workqueue; |
49 | ||
17926a79 DH |
50 | static void rxrpc_sock_destructor(struct sock *); |
51 | ||
52 | /* | |
53 | * see if an RxRPC socket is currently writable | |
54 | */ | |
55 | static inline int rxrpc_writable(struct sock *sk) | |
56 | { | |
57 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
58 | } | |
59 | ||
60 | /* | |
61 | * wait for write bufferage to become available | |
62 | */ | |
63 | static void rxrpc_write_space(struct sock *sk) | |
64 | { | |
65 | _enter("%p", sk); | |
43815482 | 66 | rcu_read_lock(); |
17926a79 | 67 | if (rxrpc_writable(sk)) { |
43815482 ED |
68 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
69 | ||
70 | if (wq_has_sleeper(wq)) | |
71 | wake_up_interruptible(&wq->wait); | |
8d8ad9d7 | 72 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 73 | } |
43815482 | 74 | rcu_read_unlock(); |
17926a79 DH |
75 | } |
76 | ||
77 | /* | |
78 | * validate an RxRPC address | |
79 | */ | |
80 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
81 | struct sockaddr_rxrpc *srx, | |
82 | int len) | |
83 | { | |
84 | if (len < sizeof(struct sockaddr_rxrpc)) | |
85 | return -EINVAL; | |
86 | ||
87 | if (srx->srx_family != AF_RXRPC) | |
88 | return -EAFNOSUPPORT; | |
89 | ||
90 | if (srx->transport_type != SOCK_DGRAM) | |
91 | return -ESOCKTNOSUPPORT; | |
92 | ||
93 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
94 | if (srx->transport_len < sizeof(sa_family_t) || | |
95 | srx->transport_len > len) | |
96 | return -EINVAL; | |
97 | ||
98 | if (srx->transport.family != rx->proto) | |
99 | return -EAFNOSUPPORT; | |
100 | ||
101 | switch (srx->transport.family) { | |
102 | case AF_INET: | |
21454aaa | 103 | _debug("INET: %x @ %pI4", |
17926a79 | 104 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 105 | &srx->transport.sin.sin_addr); |
17926a79 DH |
106 | if (srx->transport_len > 8) |
107 | memset((void *)&srx->transport + 8, 0, | |
108 | srx->transport_len - 8); | |
109 | break; | |
110 | ||
111 | case AF_INET6: | |
112 | default: | |
113 | return -EAFNOSUPPORT; | |
114 | } | |
115 | ||
116 | return 0; | |
117 | } | |
118 | ||
119 | /* | |
120 | * bind a local address to an RxRPC socket | |
121 | */ | |
122 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
123 | { | |
124 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) saddr; | |
125 | struct sock *sk = sock->sk; | |
126 | struct rxrpc_local *local; | |
127 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
128 | __be16 service_id; | |
129 | int ret; | |
130 | ||
131 | _enter("%p,%p,%d", rx, saddr, len); | |
132 | ||
133 | ret = rxrpc_validate_address(rx, srx, len); | |
134 | if (ret < 0) | |
135 | goto error; | |
136 | ||
137 | lock_sock(&rx->sk); | |
138 | ||
139 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) { | |
140 | ret = -EINVAL; | |
141 | goto error_unlock; | |
142 | } | |
143 | ||
144 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
145 | ||
146 | /* find a local transport endpoint if we don't have one already */ | |
147 | local = rxrpc_lookup_local(&rx->srx); | |
148 | if (IS_ERR(local)) { | |
149 | ret = PTR_ERR(local); | |
150 | goto error_unlock; | |
151 | } | |
152 | ||
153 | rx->local = local; | |
154 | if (srx->srx_service) { | |
155 | service_id = htons(srx->srx_service); | |
156 | write_lock_bh(&local->services_lock); | |
157 | list_for_each_entry(prx, &local->services, listen_link) { | |
158 | if (prx->service_id == service_id) | |
159 | goto service_in_use; | |
160 | } | |
161 | ||
162 | rx->service_id = service_id; | |
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 { | |
168 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
169 | } | |
170 | ||
171 | release_sock(&rx->sk); | |
172 | _leave(" = 0"); | |
173 | return 0; | |
174 | ||
175 | service_in_use: | |
176 | ret = -EADDRINUSE; | |
177 | write_unlock_bh(&local->services_lock); | |
178 | error_unlock: | |
179 | release_sock(&rx->sk); | |
180 | error: | |
181 | _leave(" = %d", ret); | |
182 | return ret; | |
183 | } | |
184 | ||
185 | /* | |
186 | * set the number of pending calls permitted on a listening socket | |
187 | */ | |
188 | static int rxrpc_listen(struct socket *sock, int backlog) | |
189 | { | |
190 | struct sock *sk = sock->sk; | |
191 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
192 | int ret; | |
193 | ||
194 | _enter("%p,%d", rx, backlog); | |
195 | ||
196 | lock_sock(&rx->sk); | |
197 | ||
198 | switch (rx->sk.sk_state) { | |
199 | case RXRPC_UNCONNECTED: | |
200 | ret = -EADDRNOTAVAIL; | |
201 | break; | |
202 | case RXRPC_CLIENT_BOUND: | |
203 | case RXRPC_CLIENT_CONNECTED: | |
204 | default: | |
205 | ret = -EBUSY; | |
206 | break; | |
207 | case RXRPC_SERVER_BOUND: | |
208 | ASSERT(rx->local != NULL); | |
209 | sk->sk_max_ack_backlog = backlog; | |
210 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
211 | ret = 0; | |
212 | break; | |
213 | } | |
214 | ||
215 | release_sock(&rx->sk); | |
216 | _leave(" = %d", ret); | |
217 | return ret; | |
218 | } | |
219 | ||
220 | /* | |
221 | * find a transport by address | |
222 | */ | |
223 | static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock, | |
224 | struct sockaddr *addr, | |
651350d1 DH |
225 | int addr_len, int flags, |
226 | gfp_t gfp) | |
17926a79 DH |
227 | { |
228 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
229 | struct rxrpc_transport *trans; | |
230 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
231 | struct rxrpc_peer *peer; | |
232 | ||
233 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
234 | ||
235 | ASSERT(rx->local != NULL); | |
236 | ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED); | |
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 | |
258 | * @srx: The address of the peer to contact (defaults to socket setting) | |
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); | |
279 | __be16 service_id; | |
280 | ||
281 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
282 | ||
283 | lock_sock(&rx->sk); | |
284 | ||
285 | if (srx) { | |
286 | trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx, | |
287 | sizeof(*srx), 0, gfp); | |
288 | if (IS_ERR(trans)) { | |
e231c2ee | 289 | call = ERR_CAST(trans); |
651350d1 | 290 | trans = NULL; |
15bde727 | 291 | goto out_notrans; |
651350d1 DH |
292 | } |
293 | } else { | |
294 | trans = rx->trans; | |
295 | if (!trans) { | |
296 | call = ERR_PTR(-ENOTCONN); | |
15bde727 | 297 | goto out_notrans; |
651350d1 DH |
298 | } |
299 | atomic_inc(&trans->usage); | |
300 | } | |
301 | ||
302 | service_id = rx->service_id; | |
303 | if (srx) | |
304 | service_id = htons(srx->srx_service); | |
305 | ||
306 | if (!key) | |
307 | key = rx->key; | |
308 | if (key && !key->payload.data) | |
309 | key = NULL; /* a no-security key */ | |
310 | ||
311 | bundle = rxrpc_get_bundle(rx, trans, key, service_id, gfp); | |
312 | if (IS_ERR(bundle)) { | |
e231c2ee | 313 | call = ERR_CAST(bundle); |
651350d1 DH |
314 | goto out; |
315 | } | |
316 | ||
317 | call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true, | |
318 | gfp); | |
319 | rxrpc_put_bundle(trans, bundle); | |
320 | out: | |
321 | rxrpc_put_transport(trans); | |
15bde727 | 322 | out_notrans: |
651350d1 DH |
323 | release_sock(&rx->sk); |
324 | _leave(" = %p", call); | |
325 | return call; | |
326 | } | |
327 | ||
328 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); | |
329 | ||
330 | /** | |
331 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
332 | * @call: The call to end | |
333 | * | |
334 | * Allow a kernel service to end a call it was using. The call must be | |
335 | * complete before this is called (the call should be aborted if necessary). | |
336 | */ | |
337 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
338 | { | |
339 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
340 | rxrpc_remove_user_ID(call->socket, call); | |
341 | rxrpc_put_call(call); | |
342 | } | |
343 | ||
344 | EXPORT_SYMBOL(rxrpc_kernel_end_call); | |
345 | ||
346 | /** | |
347 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
348 | * @sock: The socket to intercept received messages on | |
349 | * @interceptor: The function to pass the messages to | |
350 | * | |
351 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
352 | * RxRPC socket. They get passed to the specified function instead. | |
353 | * @interceptor should free the socket buffers it is given. @interceptor is | |
354 | * called with the socket receive queue spinlock held and softirqs disabled - | |
355 | * this ensures that the messages will be delivered in the right order. | |
356 | */ | |
357 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
358 | rxrpc_interceptor_t interceptor) | |
359 | { | |
360 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
361 | ||
362 | _enter(""); | |
363 | rx->interceptor = interceptor; | |
364 | } | |
365 | ||
366 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
367 | ||
17926a79 DH |
368 | /* |
369 | * connect an RxRPC socket | |
370 | * - this just targets it at a specific destination; no actual connection | |
371 | * negotiation takes place | |
372 | */ | |
373 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
374 | int addr_len, int flags) | |
375 | { | |
376 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
377 | struct sock *sk = sock->sk; | |
378 | struct rxrpc_transport *trans; | |
379 | struct rxrpc_local *local; | |
380 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
381 | int ret; | |
382 | ||
383 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
384 | ||
385 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
386 | if (ret < 0) { | |
387 | _leave(" = %d [bad addr]", ret); | |
388 | return ret; | |
389 | } | |
390 | ||
391 | lock_sock(&rx->sk); | |
392 | ||
393 | switch (rx->sk.sk_state) { | |
394 | case RXRPC_UNCONNECTED: | |
395 | /* find a local transport endpoint if we don't have one already */ | |
396 | ASSERTCMP(rx->local, ==, NULL); | |
397 | rx->srx.srx_family = AF_RXRPC; | |
398 | rx->srx.srx_service = 0; | |
399 | rx->srx.transport_type = srx->transport_type; | |
400 | rx->srx.transport_len = sizeof(sa_family_t); | |
401 | rx->srx.transport.family = srx->transport.family; | |
402 | local = rxrpc_lookup_local(&rx->srx); | |
403 | if (IS_ERR(local)) { | |
404 | release_sock(&rx->sk); | |
405 | return PTR_ERR(local); | |
406 | } | |
407 | rx->local = local; | |
408 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
409 | case RXRPC_CLIENT_BOUND: | |
410 | break; | |
411 | case RXRPC_CLIENT_CONNECTED: | |
412 | release_sock(&rx->sk); | |
413 | return -EISCONN; | |
414 | default: | |
415 | release_sock(&rx->sk); | |
416 | return -EBUSY; /* server sockets can't connect as well */ | |
417 | } | |
418 | ||
651350d1 DH |
419 | trans = rxrpc_name_to_transport(sock, addr, addr_len, flags, |
420 | GFP_KERNEL); | |
17926a79 DH |
421 | if (IS_ERR(trans)) { |
422 | release_sock(&rx->sk); | |
423 | _leave(" = %ld", PTR_ERR(trans)); | |
424 | return PTR_ERR(trans); | |
425 | } | |
426 | ||
427 | rx->trans = trans; | |
428 | rx->service_id = htons(srx->srx_service); | |
429 | rx->sk.sk_state = RXRPC_CLIENT_CONNECTED; | |
430 | ||
431 | release_sock(&rx->sk); | |
432 | return 0; | |
433 | } | |
434 | ||
435 | /* | |
436 | * send a message through an RxRPC socket | |
437 | * - in a client this does a number of things: | |
438 | * - finds/sets up a connection for the security specified (if any) | |
439 | * - initiates a call (ID in control data) | |
440 | * - ends the request phase of a call (if MSG_MORE is not set) | |
441 | * - sends a call data packet | |
442 | * - may send an abort (abort code in control data) | |
443 | */ | |
444 | static int rxrpc_sendmsg(struct kiocb *iocb, struct socket *sock, | |
445 | struct msghdr *m, size_t len) | |
446 | { | |
447 | struct rxrpc_transport *trans; | |
448 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
449 | int ret; | |
450 | ||
451 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
452 | ||
453 | if (m->msg_flags & MSG_OOB) | |
454 | return -EOPNOTSUPP; | |
455 | ||
456 | if (m->msg_name) { | |
457 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
458 | if (ret < 0) { | |
459 | _leave(" = %d [bad addr]", ret); | |
460 | return ret; | |
461 | } | |
462 | } | |
463 | ||
464 | trans = NULL; | |
465 | lock_sock(&rx->sk); | |
466 | ||
467 | if (m->msg_name) { | |
468 | ret = -EISCONN; | |
469 | trans = rxrpc_name_to_transport(sock, m->msg_name, | |
651350d1 | 470 | m->msg_namelen, 0, GFP_KERNEL); |
17926a79 DH |
471 | if (IS_ERR(trans)) { |
472 | ret = PTR_ERR(trans); | |
473 | trans = NULL; | |
474 | goto out; | |
475 | } | |
476 | } else { | |
477 | trans = rx->trans; | |
478 | if (trans) | |
479 | atomic_inc(&trans->usage); | |
480 | } | |
481 | ||
482 | switch (rx->sk.sk_state) { | |
483 | case RXRPC_SERVER_LISTENING: | |
484 | if (!m->msg_name) { | |
485 | ret = rxrpc_server_sendmsg(iocb, rx, m, len); | |
486 | break; | |
487 | } | |
488 | case RXRPC_SERVER_BOUND: | |
489 | case RXRPC_CLIENT_BOUND: | |
490 | if (!m->msg_name) { | |
491 | ret = -ENOTCONN; | |
492 | break; | |
493 | } | |
494 | case RXRPC_CLIENT_CONNECTED: | |
495 | ret = rxrpc_client_sendmsg(iocb, rx, trans, m, len); | |
496 | break; | |
497 | default: | |
498 | ret = -ENOTCONN; | |
499 | break; | |
500 | } | |
501 | ||
502 | out: | |
503 | release_sock(&rx->sk); | |
504 | if (trans) | |
505 | rxrpc_put_transport(trans); | |
506 | _leave(" = %d", ret); | |
507 | return ret; | |
508 | } | |
509 | ||
510 | /* | |
511 | * set RxRPC socket options | |
512 | */ | |
513 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 514 | char __user *optval, unsigned int optlen) |
17926a79 DH |
515 | { |
516 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 517 | unsigned int min_sec_level; |
17926a79 DH |
518 | int ret; |
519 | ||
520 | _enter(",%d,%d,,%d", level, optname, optlen); | |
521 | ||
522 | lock_sock(&rx->sk); | |
523 | ret = -EOPNOTSUPP; | |
524 | ||
525 | if (level == SOL_RXRPC) { | |
526 | switch (optname) { | |
527 | case RXRPC_EXCLUSIVE_CONNECTION: | |
528 | ret = -EINVAL; | |
529 | if (optlen != 0) | |
530 | goto error; | |
531 | ret = -EISCONN; | |
532 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
533 | goto error; | |
534 | set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); | |
535 | goto success; | |
536 | ||
537 | case RXRPC_SECURITY_KEY: | |
538 | ret = -EINVAL; | |
539 | if (rx->key) | |
540 | goto error; | |
541 | ret = -EISCONN; | |
542 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
543 | goto error; | |
544 | ret = rxrpc_request_key(rx, optval, optlen); | |
545 | goto error; | |
546 | ||
547 | case RXRPC_SECURITY_KEYRING: | |
548 | ret = -EINVAL; | |
549 | if (rx->key) | |
550 | goto error; | |
551 | ret = -EISCONN; | |
552 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
553 | goto error; | |
554 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
555 | goto error; | |
556 | ||
557 | case RXRPC_MIN_SECURITY_LEVEL: | |
558 | ret = -EINVAL; | |
95c96174 | 559 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
560 | goto error; |
561 | ret = -EISCONN; | |
562 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
563 | goto error; | |
564 | ret = get_user(min_sec_level, | |
95c96174 | 565 | (unsigned int __user *) optval); |
17926a79 DH |
566 | if (ret < 0) |
567 | goto error; | |
568 | ret = -EINVAL; | |
569 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
570 | goto error; | |
571 | rx->min_sec_level = min_sec_level; | |
572 | goto success; | |
573 | ||
574 | default: | |
575 | break; | |
576 | } | |
577 | } | |
578 | ||
579 | success: | |
580 | ret = 0; | |
581 | error: | |
582 | release_sock(&rx->sk); | |
583 | return ret; | |
584 | } | |
585 | ||
586 | /* | |
587 | * permit an RxRPC socket to be polled | |
588 | */ | |
589 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
590 | poll_table *wait) | |
591 | { | |
592 | unsigned int mask; | |
593 | struct sock *sk = sock->sk; | |
594 | ||
aa395145 | 595 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
596 | mask = 0; |
597 | ||
598 | /* the socket is readable if there are any messages waiting on the Rx | |
599 | * queue */ | |
600 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
601 | mask |= POLLIN | POLLRDNORM; | |
602 | ||
603 | /* the socket is writable if there is space to add new data to the | |
604 | * socket; there is no guarantee that any particular call in progress | |
605 | * on the socket may have space in the Tx ACK window */ | |
606 | if (rxrpc_writable(sk)) | |
607 | mask |= POLLOUT | POLLWRNORM; | |
608 | ||
609 | return mask; | |
610 | } | |
611 | ||
612 | /* | |
613 | * create an RxRPC socket | |
614 | */ | |
3f378b68 EP |
615 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
616 | int kern) | |
17926a79 DH |
617 | { |
618 | struct rxrpc_sock *rx; | |
619 | struct sock *sk; | |
620 | ||
621 | _enter("%p,%d", sock, protocol); | |
622 | ||
09ad9bc7 | 623 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
624 | return -EAFNOSUPPORT; |
625 | ||
17926a79 DH |
626 | /* we support transport protocol UDP only */ |
627 | if (protocol != PF_INET) | |
628 | return -EPROTONOSUPPORT; | |
629 | ||
630 | if (sock->type != SOCK_DGRAM) | |
631 | return -ESOCKTNOSUPPORT; | |
632 | ||
633 | sock->ops = &rxrpc_rpc_ops; | |
634 | sock->state = SS_UNCONNECTED; | |
635 | ||
6257ff21 | 636 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto); |
17926a79 DH |
637 | if (!sk) |
638 | return -ENOMEM; | |
639 | ||
640 | sock_init_data(sock, sk); | |
641 | sk->sk_state = RXRPC_UNCONNECTED; | |
642 | sk->sk_write_space = rxrpc_write_space; | |
643 | sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen; | |
644 | sk->sk_destruct = rxrpc_sock_destructor; | |
645 | ||
646 | rx = rxrpc_sk(sk); | |
647 | rx->proto = protocol; | |
648 | rx->calls = RB_ROOT; | |
649 | ||
650 | INIT_LIST_HEAD(&rx->listen_link); | |
651 | INIT_LIST_HEAD(&rx->secureq); | |
652 | INIT_LIST_HEAD(&rx->acceptq); | |
653 | rwlock_init(&rx->call_lock); | |
654 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
655 | ||
656 | _leave(" = 0 [%p]", rx); | |
657 | return 0; | |
658 | } | |
659 | ||
660 | /* | |
661 | * RxRPC socket destructor | |
662 | */ | |
663 | static void rxrpc_sock_destructor(struct sock *sk) | |
664 | { | |
665 | _enter("%p", sk); | |
666 | ||
667 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
668 | ||
547b792c IJ |
669 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
670 | WARN_ON(!sk_unhashed(sk)); | |
671 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
672 | |
673 | if (!sock_flag(sk, SOCK_DEAD)) { | |
674 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
675 | return; | |
676 | } | |
677 | } | |
678 | ||
679 | /* | |
680 | * release an RxRPC socket | |
681 | */ | |
682 | static int rxrpc_release_sock(struct sock *sk) | |
683 | { | |
684 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
685 | ||
686 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
687 | ||
688 | /* declare the socket closed for business */ | |
689 | sock_orphan(sk); | |
690 | sk->sk_shutdown = SHUTDOWN_MASK; | |
691 | ||
692 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
693 | sk->sk_state = RXRPC_CLOSE; | |
694 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
695 | ||
696 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
697 | ||
698 | if (!list_empty(&rx->listen_link)) { | |
699 | write_lock_bh(&rx->local->services_lock); | |
700 | list_del(&rx->listen_link); | |
701 | write_unlock_bh(&rx->local->services_lock); | |
702 | } | |
703 | ||
704 | /* try to flush out this socket */ | |
705 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 706 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
707 | rxrpc_purge_queue(&sk->sk_receive_queue); |
708 | ||
709 | if (rx->conn) { | |
710 | rxrpc_put_connection(rx->conn); | |
711 | rx->conn = NULL; | |
712 | } | |
713 | ||
714 | if (rx->bundle) { | |
715 | rxrpc_put_bundle(rx->trans, rx->bundle); | |
716 | rx->bundle = NULL; | |
717 | } | |
718 | if (rx->trans) { | |
719 | rxrpc_put_transport(rx->trans); | |
720 | rx->trans = NULL; | |
721 | } | |
722 | if (rx->local) { | |
723 | rxrpc_put_local(rx->local); | |
724 | rx->local = NULL; | |
725 | } | |
726 | ||
727 | key_put(rx->key); | |
728 | rx->key = NULL; | |
729 | key_put(rx->securities); | |
730 | rx->securities = NULL; | |
731 | sock_put(sk); | |
732 | ||
733 | _leave(" = 0"); | |
734 | return 0; | |
735 | } | |
736 | ||
737 | /* | |
738 | * release an RxRPC BSD socket on close() or equivalent | |
739 | */ | |
740 | static int rxrpc_release(struct socket *sock) | |
741 | { | |
742 | struct sock *sk = sock->sk; | |
743 | ||
744 | _enter("%p{%p}", sock, sk); | |
745 | ||
746 | if (!sk) | |
747 | return 0; | |
748 | ||
749 | sock->sk = NULL; | |
750 | ||
751 | return rxrpc_release_sock(sk); | |
752 | } | |
753 | ||
754 | /* | |
755 | * RxRPC network protocol | |
756 | */ | |
757 | static const struct proto_ops rxrpc_rpc_ops = { | |
758 | .family = PF_UNIX, | |
759 | .owner = THIS_MODULE, | |
760 | .release = rxrpc_release, | |
761 | .bind = rxrpc_bind, | |
762 | .connect = rxrpc_connect, | |
763 | .socketpair = sock_no_socketpair, | |
764 | .accept = sock_no_accept, | |
765 | .getname = sock_no_getname, | |
766 | .poll = rxrpc_poll, | |
767 | .ioctl = sock_no_ioctl, | |
768 | .listen = rxrpc_listen, | |
769 | .shutdown = sock_no_shutdown, | |
770 | .setsockopt = rxrpc_setsockopt, | |
771 | .getsockopt = sock_no_getsockopt, | |
772 | .sendmsg = rxrpc_sendmsg, | |
773 | .recvmsg = rxrpc_recvmsg, | |
774 | .mmap = sock_no_mmap, | |
775 | .sendpage = sock_no_sendpage, | |
776 | }; | |
777 | ||
778 | static struct proto rxrpc_proto = { | |
779 | .name = "RXRPC", | |
780 | .owner = THIS_MODULE, | |
781 | .obj_size = sizeof(struct rxrpc_sock), | |
782 | .max_header = sizeof(struct rxrpc_header), | |
783 | }; | |
784 | ||
ec1b4cf7 | 785 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
786 | .family = PF_RXRPC, |
787 | .create = rxrpc_create, | |
788 | .owner = THIS_MODULE, | |
789 | }; | |
790 | ||
791 | /* | |
792 | * initialise and register the RxRPC protocol | |
793 | */ | |
794 | static int __init af_rxrpc_init(void) | |
795 | { | |
17926a79 DH |
796 | int ret = -1; |
797 | ||
ce6654cf | 798 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 799 | |
2c6b47de | 800 | rxrpc_epoch = htonl(get_seconds()); |
17926a79 | 801 | |
651350d1 | 802 | ret = -ENOMEM; |
17926a79 DH |
803 | rxrpc_call_jar = kmem_cache_create( |
804 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 805 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 DH |
806 | if (!rxrpc_call_jar) { |
807 | printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n"); | |
17926a79 DH |
808 | goto error_call_jar; |
809 | } | |
810 | ||
e1fcc7e2 | 811 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 DH |
812 | if (!rxrpc_workqueue) { |
813 | printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n"); | |
814 | goto error_work_queue; | |
815 | } | |
816 | ||
17926a79 | 817 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 YH |
818 | if (ret < 0) { |
819 | printk(KERN_CRIT "RxRPC: Cannot register protocol\n"); | |
17926a79 DH |
820 | goto error_proto; |
821 | } | |
822 | ||
823 | ret = sock_register(&rxrpc_family_ops); | |
824 | if (ret < 0) { | |
1c899641 | 825 | printk(KERN_CRIT "RxRPC: Cannot register socket family\n"); |
17926a79 DH |
826 | goto error_sock; |
827 | } | |
828 | ||
829 | ret = register_key_type(&key_type_rxrpc); | |
830 | if (ret < 0) { | |
1c899641 | 831 | printk(KERN_CRIT "RxRPC: Cannot register client key type\n"); |
17926a79 DH |
832 | goto error_key_type; |
833 | } | |
834 | ||
835 | ret = register_key_type(&key_type_rxrpc_s); | |
836 | if (ret < 0) { | |
1c899641 | 837 | printk(KERN_CRIT "RxRPC: Cannot register server key type\n"); |
17926a79 DH |
838 | goto error_key_type_s; |
839 | } | |
840 | ||
841 | #ifdef CONFIG_PROC_FS | |
d4beaa66 G |
842 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
843 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
844 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
845 | #endif |
846 | return 0; | |
847 | ||
848 | error_key_type_s: | |
849 | unregister_key_type(&key_type_rxrpc); | |
850 | error_key_type: | |
851 | sock_unregister(PF_RXRPC); | |
852 | error_sock: | |
853 | proto_unregister(&rxrpc_proto); | |
854 | error_proto: | |
651350d1 DH |
855 | destroy_workqueue(rxrpc_workqueue); |
856 | error_work_queue: | |
17926a79 DH |
857 | kmem_cache_destroy(rxrpc_call_jar); |
858 | error_call_jar: | |
859 | return ret; | |
860 | } | |
861 | ||
862 | /* | |
863 | * unregister the RxRPC protocol | |
864 | */ | |
865 | static void __exit af_rxrpc_exit(void) | |
866 | { | |
867 | _enter(""); | |
868 | unregister_key_type(&key_type_rxrpc_s); | |
869 | unregister_key_type(&key_type_rxrpc); | |
870 | sock_unregister(PF_RXRPC); | |
871 | proto_unregister(&rxrpc_proto); | |
872 | rxrpc_destroy_all_calls(); | |
873 | rxrpc_destroy_all_connections(); | |
874 | rxrpc_destroy_all_transports(); | |
875 | rxrpc_destroy_all_peers(); | |
876 | rxrpc_destroy_all_locals(); | |
877 | ||
878 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
879 | ||
880 | _debug("flush scheduled work"); | |
651350d1 | 881 | flush_workqueue(rxrpc_workqueue); |
ece31ffd G |
882 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
883 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 884 | destroy_workqueue(rxrpc_workqueue); |
17926a79 DH |
885 | kmem_cache_destroy(rxrpc_call_jar); |
886 | _leave(""); | |
887 | } | |
888 | ||
889 | module_init(af_rxrpc_init); | |
890 | module_exit(af_rxrpc_exit); |