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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 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 | 14 | #include <linux/module.h> |
ce6654cf | 15 | #include <linux/kernel.h> |
17926a79 | 16 | #include <linux/net.h> |
5a0e3ad6 | 17 | #include <linux/slab.h> |
17926a79 DH |
18 | #include <linux/skbuff.h> |
19 | #include <linux/poll.h> | |
20 | #include <linux/proc_fs.h> | |
76181c13 | 21 | #include <linux/key-type.h> |
457c4cbc | 22 | #include <net/net_namespace.h> |
17926a79 DH |
23 | #include <net/sock.h> |
24 | #include <net/af_rxrpc.h> | |
25 | #include "ar-internal.h" | |
26 | ||
27 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
28 | MODULE_AUTHOR("Red Hat, Inc."); | |
29 | MODULE_LICENSE("GPL"); | |
30 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
31 | ||
95c96174 | 32 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 33 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 34 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 DH |
35 | |
36 | static int sysctl_rxrpc_max_qlen __read_mostly = 10; | |
37 | ||
38 | static struct proto rxrpc_proto; | |
39 | static const struct proto_ops rxrpc_rpc_ops; | |
40 | ||
41 | /* local epoch for detecting local-end reset */ | |
0d12f8a4 | 42 | u32 rxrpc_epoch; |
17926a79 DH |
43 | |
44 | /* current debugging ID */ | |
45 | atomic_t rxrpc_debug_id; | |
46 | ||
47 | /* count of skbs currently in use */ | |
48 | atomic_t rxrpc_n_skbs; | |
49 | ||
651350d1 DH |
50 | struct workqueue_struct *rxrpc_workqueue; |
51 | ||
17926a79 DH |
52 | static void rxrpc_sock_destructor(struct sock *); |
53 | ||
54 | /* | |
55 | * see if an RxRPC socket is currently writable | |
56 | */ | |
57 | static inline int rxrpc_writable(struct sock *sk) | |
58 | { | |
59 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
60 | } | |
61 | ||
62 | /* | |
63 | * wait for write bufferage to become available | |
64 | */ | |
65 | static void rxrpc_write_space(struct sock *sk) | |
66 | { | |
67 | _enter("%p", sk); | |
43815482 | 68 | rcu_read_lock(); |
17926a79 | 69 | if (rxrpc_writable(sk)) { |
43815482 ED |
70 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
71 | ||
1ce0bf50 | 72 | if (skwq_has_sleeper(wq)) |
43815482 | 73 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 74 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 75 | } |
43815482 | 76 | rcu_read_unlock(); |
17926a79 DH |
77 | } |
78 | ||
79 | /* | |
80 | * validate an RxRPC address | |
81 | */ | |
82 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
83 | struct sockaddr_rxrpc *srx, | |
84 | int len) | |
85 | { | |
dad8aff7 | 86 | unsigned int tail; |
ab802ee0 | 87 | |
17926a79 DH |
88 | if (len < sizeof(struct sockaddr_rxrpc)) |
89 | return -EINVAL; | |
90 | ||
91 | if (srx->srx_family != AF_RXRPC) | |
92 | return -EAFNOSUPPORT; | |
93 | ||
94 | if (srx->transport_type != SOCK_DGRAM) | |
95 | return -ESOCKTNOSUPPORT; | |
96 | ||
97 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
98 | if (srx->transport_len < sizeof(sa_family_t) || | |
99 | srx->transport_len > len) | |
100 | return -EINVAL; | |
101 | ||
102 | if (srx->transport.family != rx->proto) | |
103 | return -EAFNOSUPPORT; | |
104 | ||
105 | switch (srx->transport.family) { | |
106 | case AF_INET: | |
21454aaa | 107 | _debug("INET: %x @ %pI4", |
17926a79 | 108 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 109 | &srx->transport.sin.sin_addr); |
ab802ee0 | 110 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
111 | break; |
112 | ||
113 | case AF_INET6: | |
114 | default: | |
115 | return -EAFNOSUPPORT; | |
116 | } | |
117 | ||
ab802ee0 DH |
118 | if (tail < len) |
119 | memset((void *)srx + tail, 0, len - tail); | |
17926a79 DH |
120 | return 0; |
121 | } | |
122 | ||
123 | /* | |
124 | * bind a local address to an RxRPC socket | |
125 | */ | |
126 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
127 | { | |
b4f1342f | 128 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
129 | struct sock *sk = sock->sk; |
130 | struct rxrpc_local *local; | |
131 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
17926a79 DH |
132 | int ret; |
133 | ||
134 | _enter("%p,%p,%d", rx, saddr, len); | |
135 | ||
136 | ret = rxrpc_validate_address(rx, srx, len); | |
137 | if (ret < 0) | |
138 | goto error; | |
139 | ||
140 | lock_sock(&rx->sk); | |
141 | ||
142 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) { | |
143 | ret = -EINVAL; | |
144 | goto error_unlock; | |
145 | } | |
146 | ||
147 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
148 | ||
b4f1342f | 149 | /* Find or create a local transport endpoint to use */ |
17926a79 DH |
150 | local = rxrpc_lookup_local(&rx->srx); |
151 | if (IS_ERR(local)) { | |
152 | ret = PTR_ERR(local); | |
153 | goto error_unlock; | |
154 | } | |
155 | ||
156 | rx->local = local; | |
157 | if (srx->srx_service) { | |
17926a79 DH |
158 | write_lock_bh(&local->services_lock); |
159 | list_for_each_entry(prx, &local->services, listen_link) { | |
0d12f8a4 | 160 | if (prx->srx.srx_service == srx->srx_service) |
17926a79 DH |
161 | goto service_in_use; |
162 | } | |
163 | ||
17926a79 DH |
164 | list_add_tail(&rx->listen_link, &local->services); |
165 | write_unlock_bh(&local->services_lock); | |
166 | ||
167 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
168 | } else { | |
169 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
170 | } | |
171 | ||
172 | release_sock(&rx->sk); | |
173 | _leave(" = 0"); | |
174 | return 0; | |
175 | ||
176 | service_in_use: | |
177 | ret = -EADDRINUSE; | |
178 | write_unlock_bh(&local->services_lock); | |
179 | error_unlock: | |
180 | release_sock(&rx->sk); | |
181 | error: | |
182 | _leave(" = %d", ret); | |
183 | return ret; | |
184 | } | |
185 | ||
186 | /* | |
187 | * set the number of pending calls permitted on a listening socket | |
188 | */ | |
189 | static int rxrpc_listen(struct socket *sock, int backlog) | |
190 | { | |
191 | struct sock *sk = sock->sk; | |
192 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
193 | int ret; | |
194 | ||
195 | _enter("%p,%d", rx, backlog); | |
196 | ||
197 | lock_sock(&rx->sk); | |
198 | ||
199 | switch (rx->sk.sk_state) { | |
200 | case RXRPC_UNCONNECTED: | |
201 | ret = -EADDRNOTAVAIL; | |
202 | break; | |
203 | case RXRPC_CLIENT_BOUND: | |
204 | case RXRPC_CLIENT_CONNECTED: | |
205 | default: | |
206 | ret = -EBUSY; | |
207 | break; | |
208 | case RXRPC_SERVER_BOUND: | |
209 | ASSERT(rx->local != NULL); | |
210 | sk->sk_max_ack_backlog = backlog; | |
211 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
212 | ret = 0; | |
213 | break; | |
214 | } | |
215 | ||
216 | release_sock(&rx->sk); | |
217 | _leave(" = %d", ret); | |
218 | return ret; | |
219 | } | |
220 | ||
221 | /* | |
222 | * find a transport by address | |
223 | */ | |
224 | static struct rxrpc_transport *rxrpc_name_to_transport(struct socket *sock, | |
225 | struct sockaddr *addr, | |
651350d1 DH |
226 | int addr_len, int flags, |
227 | gfp_t gfp) | |
17926a79 DH |
228 | { |
229 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
230 | struct rxrpc_transport *trans; | |
231 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
232 | struct rxrpc_peer *peer; | |
233 | ||
234 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
235 | ||
236 | ASSERT(rx->local != NULL); | |
237 | ASSERT(rx->sk.sk_state > RXRPC_UNCONNECTED); | |
238 | ||
239 | if (rx->srx.transport_type != srx->transport_type) | |
240 | return ERR_PTR(-ESOCKTNOSUPPORT); | |
241 | if (rx->srx.transport.family != srx->transport.family) | |
242 | return ERR_PTR(-EAFNOSUPPORT); | |
243 | ||
244 | /* find a remote transport endpoint from the local one */ | |
651350d1 | 245 | peer = rxrpc_get_peer(srx, gfp); |
17926a79 | 246 | if (IS_ERR(peer)) |
e231c2ee | 247 | return ERR_CAST(peer); |
17926a79 DH |
248 | |
249 | /* find a transport */ | |
651350d1 | 250 | trans = rxrpc_get_transport(rx->local, peer, gfp); |
17926a79 DH |
251 | rxrpc_put_peer(peer); |
252 | _leave(" = %p", trans); | |
253 | return trans; | |
254 | } | |
255 | ||
651350d1 DH |
256 | /** |
257 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
258 | * @sock: The socket on which to make the call | |
259 | * @srx: The address of the peer to contact (defaults to socket setting) | |
260 | * @key: The security context to use (defaults to socket setting) | |
261 | * @user_call_ID: The ID to use | |
262 | * | |
263 | * Allow a kernel service to begin a call on the nominated socket. This just | |
264 | * sets up all the internal tracking structures and allocates connection and | |
265 | * call IDs as appropriate. The call to be used is returned. | |
266 | * | |
267 | * The default socket destination address and security may be overridden by | |
268 | * supplying @srx and @key. | |
269 | */ | |
270 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
271 | struct sockaddr_rxrpc *srx, | |
272 | struct key *key, | |
273 | unsigned long user_call_ID, | |
274 | gfp_t gfp) | |
275 | { | |
276 | struct rxrpc_conn_bundle *bundle; | |
277 | struct rxrpc_transport *trans; | |
278 | struct rxrpc_call *call; | |
279 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
651350d1 DH |
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 | ||
0d12f8a4 DH |
302 | if (!srx) |
303 | srx = &rx->srx; | |
651350d1 DH |
304 | if (!key) |
305 | key = rx->key; | |
146aa8b1 | 306 | if (key && !key->payload.data[0]) |
651350d1 DH |
307 | key = NULL; /* a no-security key */ |
308 | ||
0d12f8a4 | 309 | bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, gfp); |
651350d1 | 310 | if (IS_ERR(bundle)) { |
e231c2ee | 311 | call = ERR_CAST(bundle); |
651350d1 DH |
312 | goto out; |
313 | } | |
314 | ||
315 | call = rxrpc_get_client_call(rx, trans, bundle, user_call_ID, true, | |
316 | gfp); | |
317 | rxrpc_put_bundle(trans, bundle); | |
318 | out: | |
319 | rxrpc_put_transport(trans); | |
15bde727 | 320 | out_notrans: |
651350d1 DH |
321 | release_sock(&rx->sk); |
322 | _leave(" = %p", call); | |
323 | return call; | |
324 | } | |
651350d1 DH |
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 | } | |
651350d1 DH |
340 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
341 | ||
342 | /** | |
343 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
344 | * @sock: The socket to intercept received messages on | |
345 | * @interceptor: The function to pass the messages to | |
346 | * | |
347 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
348 | * RxRPC socket. They get passed to the specified function instead. | |
349 | * @interceptor should free the socket buffers it is given. @interceptor is | |
350 | * called with the socket receive queue spinlock held and softirqs disabled - | |
351 | * this ensures that the messages will be delivered in the right order. | |
352 | */ | |
353 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
354 | rxrpc_interceptor_t interceptor) | |
355 | { | |
356 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
357 | ||
358 | _enter(""); | |
359 | rx->interceptor = interceptor; | |
360 | } | |
361 | ||
362 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
363 | ||
17926a79 DH |
364 | /* |
365 | * connect an RxRPC socket | |
366 | * - this just targets it at a specific destination; no actual connection | |
367 | * negotiation takes place | |
368 | */ | |
369 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
370 | int addr_len, int flags) | |
371 | { | |
372 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
373 | struct sock *sk = sock->sk; | |
374 | struct rxrpc_transport *trans; | |
375 | struct rxrpc_local *local; | |
376 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
377 | int ret; | |
378 | ||
379 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
380 | ||
381 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
382 | if (ret < 0) { | |
383 | _leave(" = %d [bad addr]", ret); | |
384 | return ret; | |
385 | } | |
386 | ||
387 | lock_sock(&rx->sk); | |
388 | ||
389 | switch (rx->sk.sk_state) { | |
390 | case RXRPC_UNCONNECTED: | |
391 | /* find a local transport endpoint if we don't have one already */ | |
392 | ASSERTCMP(rx->local, ==, NULL); | |
393 | rx->srx.srx_family = AF_RXRPC; | |
394 | rx->srx.srx_service = 0; | |
395 | rx->srx.transport_type = srx->transport_type; | |
396 | rx->srx.transport_len = sizeof(sa_family_t); | |
397 | rx->srx.transport.family = srx->transport.family; | |
398 | local = rxrpc_lookup_local(&rx->srx); | |
399 | if (IS_ERR(local)) { | |
400 | release_sock(&rx->sk); | |
401 | return PTR_ERR(local); | |
402 | } | |
403 | rx->local = local; | |
404 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
405 | case RXRPC_CLIENT_BOUND: | |
406 | break; | |
407 | case RXRPC_CLIENT_CONNECTED: | |
408 | release_sock(&rx->sk); | |
409 | return -EISCONN; | |
410 | default: | |
411 | release_sock(&rx->sk); | |
412 | return -EBUSY; /* server sockets can't connect as well */ | |
413 | } | |
414 | ||
651350d1 DH |
415 | trans = rxrpc_name_to_transport(sock, addr, addr_len, flags, |
416 | GFP_KERNEL); | |
17926a79 DH |
417 | if (IS_ERR(trans)) { |
418 | release_sock(&rx->sk); | |
419 | _leave(" = %ld", PTR_ERR(trans)); | |
420 | return PTR_ERR(trans); | |
421 | } | |
422 | ||
423 | rx->trans = trans; | |
17926a79 DH |
424 | rx->sk.sk_state = RXRPC_CLIENT_CONNECTED; |
425 | ||
426 | release_sock(&rx->sk); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | /* | |
431 | * send a message through an RxRPC socket | |
432 | * - in a client this does a number of things: | |
433 | * - finds/sets up a connection for the security specified (if any) | |
434 | * - initiates a call (ID in control data) | |
435 | * - ends the request phase of a call (if MSG_MORE is not set) | |
436 | * - sends a call data packet | |
437 | * - may send an abort (abort code in control data) | |
438 | */ | |
1b784140 | 439 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 DH |
440 | { |
441 | struct rxrpc_transport *trans; | |
442 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
443 | int ret; | |
444 | ||
445 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
446 | ||
447 | if (m->msg_flags & MSG_OOB) | |
448 | return -EOPNOTSUPP; | |
449 | ||
450 | if (m->msg_name) { | |
451 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
452 | if (ret < 0) { | |
453 | _leave(" = %d [bad addr]", ret); | |
454 | return ret; | |
455 | } | |
456 | } | |
457 | ||
458 | trans = NULL; | |
459 | lock_sock(&rx->sk); | |
460 | ||
461 | if (m->msg_name) { | |
462 | ret = -EISCONN; | |
463 | trans = rxrpc_name_to_transport(sock, m->msg_name, | |
651350d1 | 464 | m->msg_namelen, 0, GFP_KERNEL); |
17926a79 DH |
465 | if (IS_ERR(trans)) { |
466 | ret = PTR_ERR(trans); | |
467 | trans = NULL; | |
468 | goto out; | |
469 | } | |
470 | } else { | |
471 | trans = rx->trans; | |
472 | if (trans) | |
473 | atomic_inc(&trans->usage); | |
474 | } | |
475 | ||
476 | switch (rx->sk.sk_state) { | |
477 | case RXRPC_SERVER_LISTENING: | |
478 | if (!m->msg_name) { | |
1b784140 | 479 | ret = rxrpc_server_sendmsg(rx, m, len); |
17926a79 DH |
480 | break; |
481 | } | |
482 | case RXRPC_SERVER_BOUND: | |
483 | case RXRPC_CLIENT_BOUND: | |
484 | if (!m->msg_name) { | |
485 | ret = -ENOTCONN; | |
486 | break; | |
487 | } | |
488 | case RXRPC_CLIENT_CONNECTED: | |
1b784140 | 489 | ret = rxrpc_client_sendmsg(rx, trans, m, len); |
17926a79 DH |
490 | break; |
491 | default: | |
492 | ret = -ENOTCONN; | |
493 | break; | |
494 | } | |
495 | ||
496 | out: | |
497 | release_sock(&rx->sk); | |
498 | if (trans) | |
499 | rxrpc_put_transport(trans); | |
500 | _leave(" = %d", ret); | |
501 | return ret; | |
502 | } | |
503 | ||
504 | /* | |
505 | * set RxRPC socket options | |
506 | */ | |
507 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 508 | char __user *optval, unsigned int optlen) |
17926a79 DH |
509 | { |
510 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 511 | unsigned int min_sec_level; |
17926a79 DH |
512 | int ret; |
513 | ||
514 | _enter(",%d,%d,,%d", level, optname, optlen); | |
515 | ||
516 | lock_sock(&rx->sk); | |
517 | ret = -EOPNOTSUPP; | |
518 | ||
519 | if (level == SOL_RXRPC) { | |
520 | switch (optname) { | |
521 | case RXRPC_EXCLUSIVE_CONNECTION: | |
522 | ret = -EINVAL; | |
523 | if (optlen != 0) | |
524 | goto error; | |
525 | ret = -EISCONN; | |
526 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
527 | goto error; | |
528 | set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); | |
529 | goto success; | |
530 | ||
531 | case RXRPC_SECURITY_KEY: | |
532 | ret = -EINVAL; | |
533 | if (rx->key) | |
534 | goto error; | |
535 | ret = -EISCONN; | |
536 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
537 | goto error; | |
538 | ret = rxrpc_request_key(rx, optval, optlen); | |
539 | goto error; | |
540 | ||
541 | case RXRPC_SECURITY_KEYRING: | |
542 | ret = -EINVAL; | |
543 | if (rx->key) | |
544 | goto error; | |
545 | ret = -EISCONN; | |
546 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
547 | goto error; | |
548 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
549 | goto error; | |
550 | ||
551 | case RXRPC_MIN_SECURITY_LEVEL: | |
552 | ret = -EINVAL; | |
95c96174 | 553 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
554 | goto error; |
555 | ret = -EISCONN; | |
556 | if (rx->sk.sk_state != RXRPC_UNCONNECTED) | |
557 | goto error; | |
558 | ret = get_user(min_sec_level, | |
95c96174 | 559 | (unsigned int __user *) optval); |
17926a79 DH |
560 | if (ret < 0) |
561 | goto error; | |
562 | ret = -EINVAL; | |
563 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
564 | goto error; | |
565 | rx->min_sec_level = min_sec_level; | |
566 | goto success; | |
567 | ||
568 | default: | |
569 | break; | |
570 | } | |
571 | } | |
572 | ||
573 | success: | |
574 | ret = 0; | |
575 | error: | |
576 | release_sock(&rx->sk); | |
577 | return ret; | |
578 | } | |
579 | ||
580 | /* | |
581 | * permit an RxRPC socket to be polled | |
582 | */ | |
583 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
584 | poll_table *wait) | |
585 | { | |
586 | unsigned int mask; | |
587 | struct sock *sk = sock->sk; | |
588 | ||
aa395145 | 589 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
590 | mask = 0; |
591 | ||
592 | /* the socket is readable if there are any messages waiting on the Rx | |
593 | * queue */ | |
594 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
595 | mask |= POLLIN | POLLRDNORM; | |
596 | ||
597 | /* the socket is writable if there is space to add new data to the | |
598 | * socket; there is no guarantee that any particular call in progress | |
599 | * on the socket may have space in the Tx ACK window */ | |
600 | if (rxrpc_writable(sk)) | |
601 | mask |= POLLOUT | POLLWRNORM; | |
602 | ||
603 | return mask; | |
604 | } | |
605 | ||
606 | /* | |
607 | * create an RxRPC socket | |
608 | */ | |
3f378b68 EP |
609 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
610 | int kern) | |
17926a79 DH |
611 | { |
612 | struct rxrpc_sock *rx; | |
613 | struct sock *sk; | |
614 | ||
615 | _enter("%p,%d", sock, protocol); | |
616 | ||
09ad9bc7 | 617 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
618 | return -EAFNOSUPPORT; |
619 | ||
b4f1342f | 620 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
621 | if (protocol != PF_INET) |
622 | return -EPROTONOSUPPORT; | |
623 | ||
624 | if (sock->type != SOCK_DGRAM) | |
625 | return -ESOCKTNOSUPPORT; | |
626 | ||
627 | sock->ops = &rxrpc_rpc_ops; | |
628 | sock->state = SS_UNCONNECTED; | |
629 | ||
11aa9c28 | 630 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
631 | if (!sk) |
632 | return -ENOMEM; | |
633 | ||
634 | sock_init_data(sock, sk); | |
635 | sk->sk_state = RXRPC_UNCONNECTED; | |
636 | sk->sk_write_space = rxrpc_write_space; | |
637 | sk->sk_max_ack_backlog = sysctl_rxrpc_max_qlen; | |
638 | sk->sk_destruct = rxrpc_sock_destructor; | |
639 | ||
640 | rx = rxrpc_sk(sk); | |
641 | rx->proto = protocol; | |
642 | rx->calls = RB_ROOT; | |
643 | ||
644 | INIT_LIST_HEAD(&rx->listen_link); | |
645 | INIT_LIST_HEAD(&rx->secureq); | |
646 | INIT_LIST_HEAD(&rx->acceptq); | |
647 | rwlock_init(&rx->call_lock); | |
648 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
649 | ||
650 | _leave(" = 0 [%p]", rx); | |
651 | return 0; | |
652 | } | |
653 | ||
654 | /* | |
655 | * RxRPC socket destructor | |
656 | */ | |
657 | static void rxrpc_sock_destructor(struct sock *sk) | |
658 | { | |
659 | _enter("%p", sk); | |
660 | ||
661 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
662 | ||
547b792c IJ |
663 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
664 | WARN_ON(!sk_unhashed(sk)); | |
665 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
666 | |
667 | if (!sock_flag(sk, SOCK_DEAD)) { | |
668 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
669 | return; | |
670 | } | |
671 | } | |
672 | ||
673 | /* | |
674 | * release an RxRPC socket | |
675 | */ | |
676 | static int rxrpc_release_sock(struct sock *sk) | |
677 | { | |
678 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
679 | ||
680 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
681 | ||
682 | /* declare the socket closed for business */ | |
683 | sock_orphan(sk); | |
684 | sk->sk_shutdown = SHUTDOWN_MASK; | |
685 | ||
686 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
687 | sk->sk_state = RXRPC_CLOSE; | |
688 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
689 | ||
690 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
691 | ||
692 | if (!list_empty(&rx->listen_link)) { | |
693 | write_lock_bh(&rx->local->services_lock); | |
694 | list_del(&rx->listen_link); | |
695 | write_unlock_bh(&rx->local->services_lock); | |
696 | } | |
697 | ||
698 | /* try to flush out this socket */ | |
699 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 700 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
701 | rxrpc_purge_queue(&sk->sk_receive_queue); |
702 | ||
703 | if (rx->conn) { | |
704 | rxrpc_put_connection(rx->conn); | |
705 | rx->conn = NULL; | |
706 | } | |
707 | ||
708 | if (rx->bundle) { | |
709 | rxrpc_put_bundle(rx->trans, rx->bundle); | |
710 | rx->bundle = NULL; | |
711 | } | |
712 | if (rx->trans) { | |
713 | rxrpc_put_transport(rx->trans); | |
714 | rx->trans = NULL; | |
715 | } | |
716 | if (rx->local) { | |
717 | rxrpc_put_local(rx->local); | |
718 | rx->local = NULL; | |
719 | } | |
720 | ||
721 | key_put(rx->key); | |
722 | rx->key = NULL; | |
723 | key_put(rx->securities); | |
724 | rx->securities = NULL; | |
725 | sock_put(sk); | |
726 | ||
727 | _leave(" = 0"); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | /* | |
732 | * release an RxRPC BSD socket on close() or equivalent | |
733 | */ | |
734 | static int rxrpc_release(struct socket *sock) | |
735 | { | |
736 | struct sock *sk = sock->sk; | |
737 | ||
738 | _enter("%p{%p}", sock, sk); | |
739 | ||
740 | if (!sk) | |
741 | return 0; | |
742 | ||
743 | sock->sk = NULL; | |
744 | ||
745 | return rxrpc_release_sock(sk); | |
746 | } | |
747 | ||
748 | /* | |
749 | * RxRPC network protocol | |
750 | */ | |
751 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 752 | .family = PF_RXRPC, |
17926a79 DH |
753 | .owner = THIS_MODULE, |
754 | .release = rxrpc_release, | |
755 | .bind = rxrpc_bind, | |
756 | .connect = rxrpc_connect, | |
757 | .socketpair = sock_no_socketpair, | |
758 | .accept = sock_no_accept, | |
759 | .getname = sock_no_getname, | |
760 | .poll = rxrpc_poll, | |
761 | .ioctl = sock_no_ioctl, | |
762 | .listen = rxrpc_listen, | |
763 | .shutdown = sock_no_shutdown, | |
764 | .setsockopt = rxrpc_setsockopt, | |
765 | .getsockopt = sock_no_getsockopt, | |
766 | .sendmsg = rxrpc_sendmsg, | |
767 | .recvmsg = rxrpc_recvmsg, | |
768 | .mmap = sock_no_mmap, | |
769 | .sendpage = sock_no_sendpage, | |
770 | }; | |
771 | ||
772 | static struct proto rxrpc_proto = { | |
773 | .name = "RXRPC", | |
774 | .owner = THIS_MODULE, | |
775 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 776 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
777 | }; |
778 | ||
ec1b4cf7 | 779 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
780 | .family = PF_RXRPC, |
781 | .create = rxrpc_create, | |
782 | .owner = THIS_MODULE, | |
783 | }; | |
784 | ||
785 | /* | |
786 | * initialise and register the RxRPC protocol | |
787 | */ | |
788 | static int __init af_rxrpc_init(void) | |
789 | { | |
17926a79 DH |
790 | int ret = -1; |
791 | ||
ce6654cf | 792 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 793 | |
0d12f8a4 | 794 | rxrpc_epoch = get_seconds(); |
17926a79 | 795 | |
651350d1 | 796 | ret = -ENOMEM; |
17926a79 DH |
797 | rxrpc_call_jar = kmem_cache_create( |
798 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 799 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 800 | if (!rxrpc_call_jar) { |
9b6d5398 | 801 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
802 | goto error_call_jar; |
803 | } | |
804 | ||
e1fcc7e2 | 805 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 806 | if (!rxrpc_workqueue) { |
9b6d5398 | 807 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
808 | goto error_work_queue; |
809 | } | |
810 | ||
648af7fc DH |
811 | ret = rxrpc_init_security(); |
812 | if (ret < 0) { | |
9b6d5398 | 813 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
814 | goto error_security; |
815 | } | |
816 | ||
17926a79 | 817 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 818 | if (ret < 0) { |
9b6d5398 | 819 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
820 | goto error_proto; |
821 | } | |
822 | ||
823 | ret = sock_register(&rxrpc_family_ops); | |
824 | if (ret < 0) { | |
9b6d5398 | 825 | pr_crit("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) { | |
9b6d5398 | 831 | pr_crit("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) { | |
9b6d5398 | 837 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
838 | goto error_key_type_s; |
839 | } | |
840 | ||
5873c083 DH |
841 | ret = rxrpc_sysctl_init(); |
842 | if (ret < 0) { | |
9b6d5398 | 843 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
844 | goto error_sysctls; |
845 | } | |
846 | ||
17926a79 | 847 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
848 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
849 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
850 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
851 | #endif |
852 | return 0; | |
853 | ||
5873c083 DH |
854 | error_sysctls: |
855 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
856 | error_key_type_s: |
857 | unregister_key_type(&key_type_rxrpc); | |
858 | error_key_type: | |
859 | sock_unregister(PF_RXRPC); | |
860 | error_sock: | |
861 | proto_unregister(&rxrpc_proto); | |
862 | error_proto: | |
651350d1 | 863 | destroy_workqueue(rxrpc_workqueue); |
648af7fc DH |
864 | error_security: |
865 | rxrpc_exit_security(); | |
651350d1 | 866 | error_work_queue: |
17926a79 DH |
867 | kmem_cache_destroy(rxrpc_call_jar); |
868 | error_call_jar: | |
869 | return ret; | |
870 | } | |
871 | ||
872 | /* | |
873 | * unregister the RxRPC protocol | |
874 | */ | |
875 | static void __exit af_rxrpc_exit(void) | |
876 | { | |
877 | _enter(""); | |
5873c083 | 878 | rxrpc_sysctl_exit(); |
17926a79 DH |
879 | unregister_key_type(&key_type_rxrpc_s); |
880 | unregister_key_type(&key_type_rxrpc); | |
881 | sock_unregister(PF_RXRPC); | |
882 | proto_unregister(&rxrpc_proto); | |
883 | rxrpc_destroy_all_calls(); | |
884 | rxrpc_destroy_all_connections(); | |
885 | rxrpc_destroy_all_transports(); | |
886 | rxrpc_destroy_all_peers(); | |
887 | rxrpc_destroy_all_locals(); | |
888 | ||
889 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
890 | ||
891 | _debug("flush scheduled work"); | |
651350d1 | 892 | flush_workqueue(rxrpc_workqueue); |
ece31ffd G |
893 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
894 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 895 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 896 | rxrpc_exit_security(); |
17926a79 DH |
897 | kmem_cache_destroy(rxrpc_call_jar); |
898 | _leave(""); | |
899 | } | |
900 | ||
901 | module_init(af_rxrpc_init); | |
902 | module_exit(af_rxrpc_exit); |