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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 */ | |
0d12f8a4 | 40 | u32 rxrpc_epoch; |
17926a79 DH |
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 | ||
1ce0bf50 | 70 | if (skwq_has_sleeper(wq)) |
43815482 | 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 | { | |
ab802ee0 DH |
84 | unsigned tail; |
85 | ||
17926a79 DH |
86 | if (len < sizeof(struct sockaddr_rxrpc)) |
87 | return -EINVAL; | |
88 | ||
89 | if (srx->srx_family != AF_RXRPC) | |
90 | return -EAFNOSUPPORT; | |
91 | ||
92 | if (srx->transport_type != SOCK_DGRAM) | |
93 | return -ESOCKTNOSUPPORT; | |
94 | ||
95 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
96 | if (srx->transport_len < sizeof(sa_family_t) || | |
97 | srx->transport_len > len) | |
98 | return -EINVAL; | |
99 | ||
100 | if (srx->transport.family != rx->proto) | |
101 | return -EAFNOSUPPORT; | |
102 | ||
103 | switch (srx->transport.family) { | |
104 | case AF_INET: | |
21454aaa | 105 | _debug("INET: %x @ %pI4", |
17926a79 | 106 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 107 | &srx->transport.sin.sin_addr); |
ab802ee0 | 108 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
109 | break; |
110 | ||
111 | case AF_INET6: | |
112 | default: | |
113 | return -EAFNOSUPPORT; | |
114 | } | |
115 | ||
ab802ee0 DH |
116 | if (tail < len) |
117 | memset((void *)srx + tail, 0, len - tail); | |
17926a79 DH |
118 | return 0; |
119 | } | |
120 | ||
121 | /* | |
122 | * bind a local address to an RxRPC socket | |
123 | */ | |
124 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
125 | { | |
b4f1342f | 126 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
127 | struct sock *sk = sock->sk; |
128 | struct rxrpc_local *local; | |
129 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
17926a79 DH |
130 | int ret; |
131 | ||
132 | _enter("%p,%p,%d", rx, saddr, len); | |
133 | ||
134 | ret = rxrpc_validate_address(rx, srx, len); | |
135 | if (ret < 0) | |
136 | goto error; | |
137 | ||
138 | lock_sock(&rx->sk); | |
139 | ||
140 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) { | |
141 | ret = -EINVAL; | |
142 | goto error_unlock; | |
143 | } | |
144 | ||
145 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
146 | ||
b4f1342f | 147 | /* Find or create a local transport endpoint to use */ |
17926a79 DH |
148 | local = rxrpc_lookup_local(&rx->srx); |
149 | if (IS_ERR(local)) { | |
150 | ret = PTR_ERR(local); | |
151 | goto error_unlock; | |
152 | } | |
153 | ||
154 | rx->local = local; | |
155 | if (srx->srx_service) { | |
17926a79 DH |
156 | write_lock_bh(&local->services_lock); |
157 | list_for_each_entry(prx, &local->services, listen_link) { | |
0d12f8a4 | 158 | if (prx->srx.srx_service == srx->srx_service) |
17926a79 DH |
159 | goto service_in_use; |
160 | } | |
161 | ||
17926a79 DH |
162 | list_add_tail(&rx->listen_link, &local->services); |
163 | write_unlock_bh(&local->services_lock); | |
164 | ||
165 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
166 | } else { | |
167 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
168 | } | |
169 | ||
170 | release_sock(&rx->sk); | |
171 | _leave(" = 0"); | |
172 | return 0; | |
173 | ||
174 | service_in_use: | |
175 | ret = -EADDRINUSE; | |
176 | write_unlock_bh(&local->services_lock); | |
177 | error_unlock: | |
178 | release_sock(&rx->sk); | |
179 | error: | |
180 | _leave(" = %d", ret); | |
181 | return ret; | |
182 | } | |
183 | ||
184 | /* | |
185 | * set the number of pending calls permitted on a listening socket | |
186 | */ | |
187 | static int rxrpc_listen(struct socket *sock, int backlog) | |
188 | { | |
189 | struct sock *sk = sock->sk; | |
190 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
191 | int ret; | |
192 | ||
193 | _enter("%p,%d", rx, backlog); | |
194 | ||
195 | lock_sock(&rx->sk); | |
196 | ||
197 | switch (rx->sk.sk_state) { | |
198 | case RXRPC_UNCONNECTED: | |
199 | ret = -EADDRNOTAVAIL; | |
200 | break; | |
201 | case RXRPC_CLIENT_BOUND: | |
202 | case RXRPC_CLIENT_CONNECTED: | |
203 | default: | |
204 | ret = -EBUSY; | |
205 | break; | |
206 | case RXRPC_SERVER_BOUND: | |
207 | ASSERT(rx->local != NULL); | |
208 | sk->sk_max_ack_backlog = backlog; | |
209 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
210 | ret = 0; | |
211 | break; | |
212 | } | |
213 | ||
214 | release_sock(&rx->sk); | |
215 | _leave(" = %d", ret); | |
216 | return ret; | |
217 | } | |
218 | ||
219 | /* | |
220 | * find a transport by address | |
221 | */ | |
222 | static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock, | |
223 | struct sockaddr *addr, | |
651350d1 DH |
224 | int addr_len, int flags, |
225 | gfp_t gfp) | |
17926a79 DH |
226 | { |
227 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
228 | struct rxrpc_transport *trans; | |
229 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
230 | struct rxrpc_peer *peer; | |
231 | ||
232 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
233 | ||
234 | ASSERT(rx->local != NULL); | |
235 | ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED); | |
236 | ||
237 | if (rx->srx.transport_type != srx->transport_type) | |
238 | return ERR_PTR(-ESOCKTNOSUPPORT); | |
239 | if (rx->srx.transport.family != srx->transport.family) | |
240 | return ERR_PTR(-EAFNOSUPPORT); | |
241 | ||
242 | /* find a remote transport endpoint from the local one */ | |
651350d1 | 243 | peer = rxrpc_get_peer(srx, gfp); |
17926a79 | 244 | if (IS_ERR(peer)) |
e231c2ee | 245 | return ERR_CAST(peer); |
17926a79 DH |
246 | |
247 | /* find a transport */ | |
651350d1 | 248 | trans = rxrpc_get_transport(rx->local, peer, gfp); |
17926a79 DH |
249 | rxrpc_put_peer(peer); |
250 | _leave(" = %p", trans); | |
251 | return trans; | |
252 | } | |
253 | ||
651350d1 DH |
254 | /** |
255 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
256 | * @sock: The socket on which to make the call | |
257 | * @srx: The address of the peer to contact (defaults to socket setting) | |
258 | * @key: The security context to use (defaults to socket setting) | |
259 | * @user_call_ID: The ID to use | |
260 | * | |
261 | * Allow a kernel service to begin a call on the nominated socket. This just | |
262 | * sets up all the internal tracking structures and allocates connection and | |
263 | * call IDs as appropriate. The call to be used is returned. | |
264 | * | |
265 | * The default socket destination address and security may be overridden by | |
266 | * supplying @srx and @key. | |
267 | */ | |
268 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
269 | struct sockaddr_rxrpc *srx, | |
270 | struct key *key, | |
271 | unsigned long user_call_ID, | |
272 | gfp_t gfp) | |
273 | { | |
274 | struct rxrpc_conn_bundle *bundle; | |
275 | struct rxrpc_transport *trans; | |
276 | struct rxrpc_call *call; | |
277 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
651350d1 DH |
278 | |
279 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
280 | ||
281 | lock_sock(&rx->sk); | |
282 | ||
283 | if (srx) { | |
284 | trans = rxrpc_name_to_transport(sock, (struct sockaddr *) srx, | |
285 | sizeof(*srx), 0, gfp); | |
286 | if (IS_ERR(trans)) { | |
e231c2ee | 287 | call = ERR_CAST(trans); |
651350d1 | 288 | trans = NULL; |
15bde727 | 289 | goto out_notrans; |
651350d1 DH |
290 | } |
291 | } else { | |
292 | trans = rx->trans; | |
293 | if (!trans) { | |
294 | call = ERR_PTR(-ENOTCONN); | |
15bde727 | 295 | goto out_notrans; |
651350d1 DH |
296 | } |
297 | atomic_inc(&trans->usage); | |
298 | } | |
299 | ||
0d12f8a4 DH |
300 | if (!srx) |
301 | srx = &rx->srx; | |
651350d1 DH |
302 | if (!key) |
303 | key = rx->key; | |
146aa8b1 | 304 | if (key && !key->payload.data[0]) |
651350d1 DH |
305 | key = NULL; /* a no-security key */ |
306 | ||
0d12f8a4 | 307 | bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, gfp); |
651350d1 | 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); | |
15bde727 | 318 | out_notrans: |
651350d1 DH |
319 | release_sock(&rx->sk); |
320 | _leave(" = %p", call); | |
321 | return call; | |
322 | } | |
651350d1 DH |
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 | } | |
651350d1 DH |
338 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
339 | ||
340 | /** | |
341 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
342 | * @sock: The socket to intercept received messages on | |
343 | * @interceptor: The function to pass the messages to | |
344 | * | |
345 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
346 | * RxRPC socket. They get passed to the specified function instead. | |
347 | * @interceptor should free the socket buffers it is given. @interceptor is | |
348 | * called with the socket receive queue spinlock held and softirqs disabled - | |
349 | * this ensures that the messages will be delivered in the right order. | |
350 | */ | |
351 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
352 | rxrpc_interceptor_t interceptor) | |
353 | { | |
354 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
355 | ||
356 | _enter(""); | |
357 | rx->interceptor = interceptor; | |
358 | } | |
359 | ||
360 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
361 | ||
17926a79 DH |
362 | /* |
363 | * connect an RxRPC socket | |
364 | * - this just targets it at a specific destination; no actual connection | |
365 | * negotiation takes place | |
366 | */ | |
367 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
368 | int addr_len, int flags) | |
369 | { | |
370 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
371 | struct sock *sk = sock->sk; | |
372 | struct rxrpc_transport *trans; | |
373 | struct rxrpc_local *local; | |
374 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
375 | int ret; | |
376 | ||
377 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
378 | ||
379 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
380 | if (ret < 0) { | |
381 | _leave(" = %d [bad addr]", ret); | |
382 | return ret; | |
383 | } | |
384 | ||
385 | lock_sock(&rx->sk); | |
386 | ||
387 | switch (rx->sk.sk_state) { | |
388 | case RXRPC_UNCONNECTED: | |
389 | /* find a local transport endpoint if we don't have one already */ | |
390 | ASSERTCMP(rx->local, ==, NULL); | |
391 | rx->srx.srx_family = AF_RXRPC; | |
392 | rx->srx.srx_service = 0; | |
393 | rx->srx.transport_type = srx->transport_type; | |
394 | rx->srx.transport_len = sizeof(sa_family_t); | |
395 | rx->srx.transport.family = srx->transport.family; | |
396 | local = rxrpc_lookup_local(&rx->srx); | |
397 | if (IS_ERR(local)) { | |
398 | release_sock(&rx->sk); | |
399 | return PTR_ERR(local); | |
400 | } | |
401 | rx->local = local; | |
402 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
403 | case RXRPC_CLIENT_BOUND: | |
404 | break; | |
405 | case RXRPC_CLIENT_CONNECTED: | |
406 | release_sock(&rx->sk); | |
407 | return -EISCONN; | |
408 | default: | |
409 | release_sock(&rx->sk); | |
410 | return -EBUSY; /* server sockets can't connect as well */ | |
411 | } | |
412 | ||
651350d1 DH |
413 | trans = rxrpc_name_to_transport(sock, addr, addr_len, flags, |
414 | GFP_KERNEL); | |
17926a79 DH |
415 | if (IS_ERR(trans)) { |
416 | release_sock(&rx->sk); | |
417 | _leave(" = %ld", PTR_ERR(trans)); | |
418 | return PTR_ERR(trans); | |
419 | } | |
420 | ||
421 | rx->trans = trans; | |
17926a79 DH |
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 | */ | |
1b784140 | 437 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 DH |
438 | { |
439 | struct rxrpc_transport *trans; | |
440 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
441 | int ret; | |
442 | ||
443 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
444 | ||
445 | if (m->msg_flags & MSG_OOB) | |
446 | return -EOPNOTSUPP; | |
447 | ||
448 | if (m->msg_name) { | |
449 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
450 | if (ret < 0) { | |
451 | _leave(" = %d [bad addr]", ret); | |
452 | return ret; | |
453 | } | |
454 | } | |
455 | ||
456 | trans = NULL; | |
457 | lock_sock(&rx->sk); | |
458 | ||
459 | if (m->msg_name) { | |
460 | ret = -EISCONN; | |
461 | trans = rxrpc_name_to_transport(sock, m->msg_name, | |
651350d1 | 462 | m->msg_namelen, 0, GFP_KERNEL); |
17926a79 DH |
463 | if (IS_ERR(trans)) { |
464 | ret = PTR_ERR(trans); | |
465 | trans = NULL; | |
466 | goto out; | |
467 | } | |
468 | } else { | |
469 | trans = rx->trans; | |
470 | if (trans) | |
471 | atomic_inc(&trans->usage); | |
472 | } | |
473 | ||
474 | switch (rx->sk.sk_state) { | |
475 | case RXRPC_SERVER_LISTENING: | |
476 | if (!m->msg_name) { | |
1b784140 | 477 | ret = rxrpc_server_sendmsg(rx, m, len); |
17926a79 DH |
478 | break; |
479 | } | |
480 | case RXRPC_SERVER_BOUND: | |
481 | case RXRPC_CLIENT_BOUND: | |
482 | if (!m->msg_name) { | |
483 | ret = -ENOTCONN; | |
484 | break; | |
485 | } | |
486 | case RXRPC_CLIENT_CONNECTED: | |
1b784140 | 487 | ret = rxrpc_client_sendmsg(rx, trans, m, len); |
17926a79 DH |
488 | break; |
489 | default: | |
490 | ret = -ENOTCONN; | |
491 | break; | |
492 | } | |
493 | ||
494 | out: | |
495 | release_sock(&rx->sk); | |
496 | if (trans) | |
497 | rxrpc_put_transport(trans); | |
498 | _leave(" = %d", ret); | |
499 | return ret; | |
500 | } | |
501 | ||
502 | /* | |
503 | * set RxRPC socket options | |
504 | */ | |
505 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 506 | char __user *optval, unsigned int optlen) |
17926a79 DH |
507 | { |
508 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 509 | unsigned int min_sec_level; |
17926a79 DH |
510 | int ret; |
511 | ||
512 | _enter(",%d,%d,,%d", level, optname, optlen); | |
513 | ||
514 | lock_sock(&rx->sk); | |
515 | ret = -EOPNOTSUPP; | |
516 | ||
517 | if (level == SOL_RXRPC) { | |
518 | switch (optname) { | |
519 | case RXRPC_EXCLUSIVE_CONNECTION: | |
520 | ret = -EINVAL; | |
521 | if (optlen != 0) | |
522 | goto error; | |
523 | ret = -EISCONN; | |
524 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
525 | goto error; | |
526 | set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); | |
527 | goto success; | |
528 | ||
529 | case RXRPC_SECURITY_KEY: | |
530 | ret = -EINVAL; | |
531 | if (rx->key) | |
532 | goto error; | |
533 | ret = -EISCONN; | |
534 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
535 | goto error; | |
536 | ret = rxrpc_request_key(rx, optval, optlen); | |
537 | goto error; | |
538 | ||
539 | case RXRPC_SECURITY_KEYRING: | |
540 | ret = -EINVAL; | |
541 | if (rx->key) | |
542 | goto error; | |
543 | ret = -EISCONN; | |
544 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
545 | goto error; | |
546 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
547 | goto error; | |
548 | ||
549 | case RXRPC_MIN_SECURITY_LEVEL: | |
550 | ret = -EINVAL; | |
95c96174 | 551 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
552 | goto error; |
553 | ret = -EISCONN; | |
554 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
555 | goto error; | |
556 | ret = get_user(min_sec_level, | |
95c96174 | 557 | (unsigned int __user *) optval); |
17926a79 DH |
558 | if (ret < 0) |
559 | goto error; | |
560 | ret = -EINVAL; | |
561 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
562 | goto error; | |
563 | rx->min_sec_level = min_sec_level; | |
564 | goto success; | |
565 | ||
566 | default: | |
567 | break; | |
568 | } | |
569 | } | |
570 | ||
571 | success: | |
572 | ret = 0; | |
573 | error: | |
574 | release_sock(&rx->sk); | |
575 | return ret; | |
576 | } | |
577 | ||
578 | /* | |
579 | * permit an RxRPC socket to be polled | |
580 | */ | |
581 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
582 | poll_table *wait) | |
583 | { | |
584 | unsigned int mask; | |
585 | struct sock *sk = sock->sk; | |
586 | ||
aa395145 | 587 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
588 | mask = 0; |
589 | ||
590 | /* the socket is readable if there are any messages waiting on the Rx | |
591 | * queue */ | |
592 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
593 | mask |= POLLIN | POLLRDNORM; | |
594 | ||
595 | /* the socket is writable if there is space to add new data to the | |
596 | * socket; there is no guarantee that any particular call in progress | |
597 | * on the socket may have space in the Tx ACK window */ | |
598 | if (rxrpc_writable(sk)) | |
599 | mask |= POLLOUT | POLLWRNORM; | |
600 | ||
601 | return mask; | |
602 | } | |
603 | ||
604 | /* | |
605 | * create an RxRPC socket | |
606 | */ | |
3f378b68 EP |
607 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
608 | int kern) | |
17926a79 DH |
609 | { |
610 | struct rxrpc_sock *rx; | |
611 | struct sock *sk; | |
612 | ||
613 | _enter("%p,%d", sock, protocol); | |
614 | ||
09ad9bc7 | 615 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
616 | return -EAFNOSUPPORT; |
617 | ||
b4f1342f | 618 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
619 | if (protocol != PF_INET) |
620 | return -EPROTONOSUPPORT; | |
621 | ||
622 | if (sock->type != SOCK_DGRAM) | |
623 | return -ESOCKTNOSUPPORT; | |
624 | ||
625 | sock->ops = &rxrpc_rpc_ops; | |
626 | sock->state = SS_UNCONNECTED; | |
627 | ||
11aa9c28 | 628 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
629 | if (!sk) |
630 | return -ENOMEM; | |
631 | ||
632 | sock_init_data(sock, sk); | |
633 | sk->sk_state = RXRPC_UNCONNECTED; | |
634 | sk->sk_write_space = rxrpc_write_space; | |
635 | sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen; | |
636 | sk->sk_destruct = rxrpc_sock_destructor; | |
637 | ||
638 | rx = rxrpc_sk(sk); | |
639 | rx->proto = protocol; | |
640 | rx->calls = RB_ROOT; | |
641 | ||
642 | INIT_LIST_HEAD(&rx->listen_link); | |
643 | INIT_LIST_HEAD(&rx->secureq); | |
644 | INIT_LIST_HEAD(&rx->acceptq); | |
645 | rwlock_init(&rx->call_lock); | |
646 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
647 | ||
648 | _leave(" = 0 [%p]", rx); | |
649 | return 0; | |
650 | } | |
651 | ||
652 | /* | |
653 | * RxRPC socket destructor | |
654 | */ | |
655 | static void rxrpc_sock_destructor(struct sock *sk) | |
656 | { | |
657 | _enter("%p", sk); | |
658 | ||
659 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
660 | ||
547b792c IJ |
661 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
662 | WARN_ON(!sk_unhashed(sk)); | |
663 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
664 | |
665 | if (!sock_flag(sk, SOCK_DEAD)) { | |
666 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
667 | return; | |
668 | } | |
669 | } | |
670 | ||
671 | /* | |
672 | * release an RxRPC socket | |
673 | */ | |
674 | static int rxrpc_release_sock(struct sock *sk) | |
675 | { | |
676 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
677 | ||
678 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
679 | ||
680 | /* declare the socket closed for business */ | |
681 | sock_orphan(sk); | |
682 | sk->sk_shutdown = SHUTDOWN_MASK; | |
683 | ||
684 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
685 | sk->sk_state = RXRPC_CLOSE; | |
686 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
687 | ||
688 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
689 | ||
690 | if (!list_empty(&rx->listen_link)) { | |
691 | write_lock_bh(&rx->local->services_lock); | |
692 | list_del(&rx->listen_link); | |
693 | write_unlock_bh(&rx->local->services_lock); | |
694 | } | |
695 | ||
696 | /* try to flush out this socket */ | |
697 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 698 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
699 | rxrpc_purge_queue(&sk->sk_receive_queue); |
700 | ||
701 | if (rx->conn) { | |
702 | rxrpc_put_connection(rx->conn); | |
703 | rx->conn = NULL; | |
704 | } | |
705 | ||
706 | if (rx->bundle) { | |
707 | rxrpc_put_bundle(rx->trans, rx->bundle); | |
708 | rx->bundle = NULL; | |
709 | } | |
710 | if (rx->trans) { | |
711 | rxrpc_put_transport(rx->trans); | |
712 | rx->trans = NULL; | |
713 | } | |
714 | if (rx->local) { | |
715 | rxrpc_put_local(rx->local); | |
716 | rx->local = NULL; | |
717 | } | |
718 | ||
719 | key_put(rx->key); | |
720 | rx->key = NULL; | |
721 | key_put(rx->securities); | |
722 | rx->securities = NULL; | |
723 | sock_put(sk); | |
724 | ||
725 | _leave(" = 0"); | |
726 | return 0; | |
727 | } | |
728 | ||
729 | /* | |
730 | * release an RxRPC BSD socket on close() or equivalent | |
731 | */ | |
732 | static int rxrpc_release(struct socket *sock) | |
733 | { | |
734 | struct sock *sk = sock->sk; | |
735 | ||
736 | _enter("%p{%p}", sock, sk); | |
737 | ||
738 | if (!sk) | |
739 | return 0; | |
740 | ||
741 | sock->sk = NULL; | |
742 | ||
743 | return rxrpc_release_sock(sk); | |
744 | } | |
745 | ||
746 | /* | |
747 | * RxRPC network protocol | |
748 | */ | |
749 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 750 | .family = PF_RXRPC, |
17926a79 DH |
751 | .owner = THIS_MODULE, |
752 | .release = rxrpc_release, | |
753 | .bind = rxrpc_bind, | |
754 | .connect = rxrpc_connect, | |
755 | .socketpair = sock_no_socketpair, | |
756 | .accept = sock_no_accept, | |
757 | .getname = sock_no_getname, | |
758 | .poll = rxrpc_poll, | |
759 | .ioctl = sock_no_ioctl, | |
760 | .listen = rxrpc_listen, | |
761 | .shutdown = sock_no_shutdown, | |
762 | .setsockopt = rxrpc_setsockopt, | |
763 | .getsockopt = sock_no_getsockopt, | |
764 | .sendmsg = rxrpc_sendmsg, | |
765 | .recvmsg = rxrpc_recvmsg, | |
766 | .mmap = sock_no_mmap, | |
767 | .sendpage = sock_no_sendpage, | |
768 | }; | |
769 | ||
770 | static struct proto rxrpc_proto = { | |
771 | .name = "RXRPC", | |
772 | .owner = THIS_MODULE, | |
773 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 774 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
775 | }; |
776 | ||
ec1b4cf7 | 777 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
778 | .family = PF_RXRPC, |
779 | .create = rxrpc_create, | |
780 | .owner = THIS_MODULE, | |
781 | }; | |
782 | ||
783 | /* | |
784 | * initialise and register the RxRPC protocol | |
785 | */ | |
786 | static int __init af_rxrpc_init(void) | |
787 | { | |
17926a79 DH |
788 | int ret = -1; |
789 | ||
ce6654cf | 790 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 791 | |
0d12f8a4 | 792 | rxrpc_epoch = get_seconds(); |
17926a79 | 793 | |
651350d1 | 794 | ret = -ENOMEM; |
17926a79 DH |
795 | rxrpc_call_jar = kmem_cache_create( |
796 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 797 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 DH |
798 | if (!rxrpc_call_jar) { |
799 | printk(KERN_NOTICE "RxRPC: Failed to allocate call jar\n"); | |
17926a79 DH |
800 | goto error_call_jar; |
801 | } | |
802 | ||
e1fcc7e2 | 803 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 DH |
804 | if (!rxrpc_workqueue) { |
805 | printk(KERN_NOTICE "RxRPC: Failed to allocate work queue\n"); | |
806 | goto error_work_queue; | |
807 | } | |
808 | ||
17926a79 | 809 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 YH |
810 | if (ret < 0) { |
811 | printk(KERN_CRIT "RxRPC: Cannot register protocol\n"); | |
17926a79 DH |
812 | goto error_proto; |
813 | } | |
814 | ||
815 | ret = sock_register(&rxrpc_family_ops); | |
816 | if (ret < 0) { | |
1c899641 | 817 | printk(KERN_CRIT "RxRPC: Cannot register socket family\n"); |
17926a79 DH |
818 | goto error_sock; |
819 | } | |
820 | ||
821 | ret = register_key_type(&key_type_rxrpc); | |
822 | if (ret < 0) { | |
1c899641 | 823 | printk(KERN_CRIT "RxRPC: Cannot register client key type\n"); |
17926a79 DH |
824 | goto error_key_type; |
825 | } | |
826 | ||
827 | ret = register_key_type(&key_type_rxrpc_s); | |
828 | if (ret < 0) { | |
1c899641 | 829 | printk(KERN_CRIT "RxRPC: Cannot register server key type\n"); |
17926a79 DH |
830 | goto error_key_type_s; |
831 | } | |
832 | ||
5873c083 DH |
833 | ret = rxrpc_sysctl_init(); |
834 | if (ret < 0) { | |
835 | printk(KERN_CRIT "RxRPC: Cannot register sysctls\n"); | |
836 | goto error_sysctls; | |
837 | } | |
838 | ||
17926a79 | 839 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
840 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
841 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
842 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
843 | #endif |
844 | return 0; | |
845 | ||
5873c083 DH |
846 | error_sysctls: |
847 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
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(""); | |
5873c083 | 868 | rxrpc_sysctl_exit(); |
17926a79 DH |
869 | unregister_key_type(&key_type_rxrpc_s); |
870 | unregister_key_type(&key_type_rxrpc); | |
871 | sock_unregister(PF_RXRPC); | |
872 | proto_unregister(&rxrpc_proto); | |
873 | rxrpc_destroy_all_calls(); | |
874 | rxrpc_destroy_all_connections(); | |
875 | rxrpc_destroy_all_transports(); | |
876 | rxrpc_destroy_all_peers(); | |
877 | rxrpc_destroy_all_locals(); | |
878 | ||
879 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
880 | ||
881 | _debug("flush scheduled work"); | |
651350d1 | 882 | flush_workqueue(rxrpc_workqueue); |
ece31ffd G |
883 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
884 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 885 | destroy_workqueue(rxrpc_workqueue); |
17926a79 DH |
886 | kmem_cache_destroy(rxrpc_call_jar); |
887 | _leave(""); | |
888 | } | |
889 | ||
890 | module_init(af_rxrpc_init); | |
891 | module_exit(af_rxrpc_exit); |