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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 | 35 | |
17926a79 DH |
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 | { | |
dad8aff7 | 84 | unsigned int tail; |
ab802ee0 | 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 | ||
19ffa01c | 100 | if (srx->transport.family != rx->family) |
17926a79 DH |
101 | return -EAFNOSUPPORT; |
102 | ||
103 | switch (srx->transport.family) { | |
104 | case AF_INET: | |
4f95dd78 DH |
105 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
106 | return -EINVAL; | |
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 | ||
2341e077 | 142 | if (rx->sk.sk_state != RXRPC_UNBOUND) { |
17926a79 DH |
143 | ret = -EINVAL; |
144 | goto error_unlock; | |
145 | } | |
146 | ||
147 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
148 | ||
17926a79 DH |
149 | local = rxrpc_lookup_local(&rx->srx); |
150 | if (IS_ERR(local)) { | |
151 | ret = PTR_ERR(local); | |
152 | goto error_unlock; | |
153 | } | |
154 | ||
2341e077 | 155 | if (rx->srx.srx_service) { |
17926a79 DH |
156 | write_lock_bh(&local->services_lock); |
157 | list_for_each_entry(prx, &local->services, listen_link) { | |
2341e077 | 158 | if (prx->srx.srx_service == rx->srx.srx_service) |
17926a79 DH |
159 | goto service_in_use; |
160 | } | |
161 | ||
2341e077 | 162 | rx->local = local; |
17926a79 DH |
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 { | |
2341e077 | 168 | rx->local = local; |
17926a79 DH |
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: | |
17926a79 | 177 | write_unlock_bh(&local->services_lock); |
2341e077 DH |
178 | rxrpc_put_local(local); |
179 | ret = -EADDRINUSE; | |
17926a79 DH |
180 | error_unlock: |
181 | release_sock(&rx->sk); | |
182 | error: | |
183 | _leave(" = %d", ret); | |
184 | return ret; | |
185 | } | |
186 | ||
187 | /* | |
188 | * set the number of pending calls permitted on a listening socket | |
189 | */ | |
190 | static int rxrpc_listen(struct socket *sock, int backlog) | |
191 | { | |
192 | struct sock *sk = sock->sk; | |
193 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
0e119b41 | 194 | unsigned int max; |
17926a79 DH |
195 | int ret; |
196 | ||
197 | _enter("%p,%d", rx, backlog); | |
198 | ||
199 | lock_sock(&rx->sk); | |
200 | ||
201 | switch (rx->sk.sk_state) { | |
2341e077 | 202 | case RXRPC_UNBOUND: |
17926a79 DH |
203 | ret = -EADDRNOTAVAIL; |
204 | break; | |
17926a79 DH |
205 | case RXRPC_SERVER_BOUND: |
206 | ASSERT(rx->local != NULL); | |
0e119b41 DH |
207 | max = READ_ONCE(rxrpc_max_backlog); |
208 | ret = -EINVAL; | |
209 | if (backlog == INT_MAX) | |
210 | backlog = max; | |
211 | else if (backlog < 0 || backlog > max) | |
212 | break; | |
17926a79 DH |
213 | sk->sk_max_ack_backlog = backlog; |
214 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
215 | ret = 0; | |
216 | break; | |
0e119b41 DH |
217 | default: |
218 | ret = -EBUSY; | |
219 | break; | |
17926a79 DH |
220 | } |
221 | ||
222 | release_sock(&rx->sk); | |
223 | _leave(" = %d", ret); | |
224 | return ret; | |
225 | } | |
226 | ||
227 | /* | |
228 | * find a transport by address | |
229 | */ | |
19ffa01c DH |
230 | struct rxrpc_transport * |
231 | rxrpc_name_to_transport(struct rxrpc_conn_parameters *cp, | |
232 | struct sockaddr *addr, | |
233 | int addr_len, | |
234 | gfp_t gfp) | |
17926a79 DH |
235 | { |
236 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *) addr; | |
237 | struct rxrpc_transport *trans; | |
17926a79 | 238 | |
19ffa01c | 239 | _enter("%p,%d", addr, addr_len); |
17926a79 | 240 | |
19ffa01c | 241 | if (cp->local->srx.transport_type != srx->transport_type) |
17926a79 | 242 | return ERR_PTR(-ESOCKTNOSUPPORT); |
19ffa01c | 243 | if (cp->local->srx.transport.family != srx->transport.family) |
17926a79 DH |
244 | return ERR_PTR(-EAFNOSUPPORT); |
245 | ||
246 | /* find a remote transport endpoint from the local one */ | |
19ffa01c DH |
247 | cp->peer = rxrpc_lookup_peer(cp->local, srx, gfp); |
248 | if (!cp->peer) | |
0e4699e4 | 249 | return ERR_PTR(-ENOMEM); |
17926a79 DH |
250 | |
251 | /* find a transport */ | |
19ffa01c DH |
252 | trans = rxrpc_get_transport(cp->local, cp->peer, gfp); |
253 | rxrpc_put_peer(cp->peer); | |
17926a79 DH |
254 | _leave(" = %p", trans); |
255 | return trans; | |
256 | } | |
257 | ||
651350d1 DH |
258 | /** |
259 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
260 | * @sock: The socket on which to make the call | |
2341e077 | 261 | * @srx: The address of the peer to contact |
651350d1 DH |
262 | * @key: The security context to use (defaults to socket setting) |
263 | * @user_call_ID: The ID to use | |
264 | * | |
265 | * Allow a kernel service to begin a call on the nominated socket. This just | |
266 | * sets up all the internal tracking structures and allocates connection and | |
267 | * call IDs as appropriate. The call to be used is returned. | |
268 | * | |
269 | * The default socket destination address and security may be overridden by | |
270 | * supplying @srx and @key. | |
271 | */ | |
272 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
273 | struct sockaddr_rxrpc *srx, | |
274 | struct key *key, | |
275 | unsigned long user_call_ID, | |
276 | gfp_t gfp) | |
277 | { | |
19ffa01c | 278 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
279 | struct rxrpc_conn_bundle *bundle; |
280 | struct rxrpc_transport *trans; | |
281 | struct rxrpc_call *call; | |
282 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 283 | int ret; |
651350d1 DH |
284 | |
285 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
286 | ||
f4552c2d DH |
287 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
288 | if (ret < 0) | |
289 | return ERR_PTR(ret); | |
290 | ||
651350d1 DH |
291 | lock_sock(&rx->sk); |
292 | ||
19ffa01c DH |
293 | if (!key) |
294 | key = rx->key; | |
295 | if (key && !key->payload.data[0]) | |
296 | key = NULL; /* a no-security key */ | |
297 | ||
298 | memset(&cp, 0, sizeof(cp)); | |
299 | cp.local = rx->local; | |
300 | cp.key = key; | |
301 | cp.security_level = 0; | |
302 | cp.exclusive = false; | |
303 | cp.service_id = srx->srx_service; | |
304 | ||
305 | trans = rxrpc_name_to_transport(&cp, (struct sockaddr *)srx, | |
306 | sizeof(*srx), gfp); | |
2341e077 DH |
307 | if (IS_ERR(trans)) { |
308 | call = ERR_CAST(trans); | |
309 | trans = NULL; | |
310 | goto out_notrans; | |
651350d1 | 311 | } |
19ffa01c | 312 | cp.peer = trans->peer; |
651350d1 | 313 | |
0d12f8a4 | 314 | bundle = rxrpc_get_bundle(rx, trans, key, srx->srx_service, gfp); |
651350d1 | 315 | if (IS_ERR(bundle)) { |
e231c2ee | 316 | call = ERR_CAST(bundle); |
651350d1 DH |
317 | goto out; |
318 | } | |
319 | ||
19ffa01c | 320 | call = rxrpc_new_client_call(rx, &cp, trans, bundle, user_call_ID, gfp); |
651350d1 DH |
321 | rxrpc_put_bundle(trans, bundle); |
322 | out: | |
323 | rxrpc_put_transport(trans); | |
15bde727 | 324 | out_notrans: |
651350d1 DH |
325 | release_sock(&rx->sk); |
326 | _leave(" = %p", call); | |
327 | return call; | |
328 | } | |
651350d1 DH |
329 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
330 | ||
331 | /** | |
332 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
333 | * @call: The call to end | |
334 | * | |
335 | * Allow a kernel service to end a call it was using. The call must be | |
336 | * complete before this is called (the call should be aborted if necessary). | |
337 | */ | |
338 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
339 | { | |
340 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
341 | rxrpc_remove_user_ID(call->socket, call); | |
342 | rxrpc_put_call(call); | |
343 | } | |
651350d1 DH |
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 | { | |
2341e077 DH |
376 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
377 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
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 | ||
2341e077 DH |
390 | ret = -EISCONN; |
391 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
392 | goto error; | |
393 | ||
17926a79 | 394 | switch (rx->sk.sk_state) { |
2341e077 DH |
395 | case RXRPC_UNBOUND: |
396 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
397 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
398 | case RXRPC_CLIENT_BOUND: |
399 | break; | |
17926a79 | 400 | default: |
2341e077 DH |
401 | ret = -EBUSY; |
402 | goto error; | |
17926a79 DH |
403 | } |
404 | ||
2341e077 DH |
405 | rx->connect_srx = *srx; |
406 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
407 | ret = 0; | |
17926a79 | 408 | |
2341e077 | 409 | error: |
17926a79 | 410 | release_sock(&rx->sk); |
2341e077 | 411 | return ret; |
17926a79 DH |
412 | } |
413 | ||
414 | /* | |
415 | * send a message through an RxRPC socket | |
416 | * - in a client this does a number of things: | |
417 | * - finds/sets up a connection for the security specified (if any) | |
418 | * - initiates a call (ID in control data) | |
419 | * - ends the request phase of a call (if MSG_MORE is not set) | |
420 | * - sends a call data packet | |
421 | * - may send an abort (abort code in control data) | |
422 | */ | |
1b784140 | 423 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 424 | { |
2341e077 | 425 | struct rxrpc_local *local; |
17926a79 DH |
426 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
427 | int ret; | |
428 | ||
429 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
430 | ||
431 | if (m->msg_flags & MSG_OOB) | |
432 | return -EOPNOTSUPP; | |
433 | ||
434 | if (m->msg_name) { | |
435 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
436 | if (ret < 0) { | |
437 | _leave(" = %d [bad addr]", ret); | |
438 | return ret; | |
439 | } | |
440 | } | |
441 | ||
17926a79 DH |
442 | lock_sock(&rx->sk); |
443 | ||
17926a79 | 444 | switch (rx->sk.sk_state) { |
2341e077 DH |
445 | case RXRPC_UNBOUND: |
446 | local = rxrpc_lookup_local(&rx->srx); | |
447 | if (IS_ERR(local)) { | |
448 | ret = PTR_ERR(local); | |
449 | goto error_unlock; | |
17926a79 | 450 | } |
2341e077 DH |
451 | |
452 | rx->local = local; | |
453 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
454 | /* Fall through */ | |
455 | ||
456 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 457 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
458 | if (!m->msg_name && |
459 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
460 | m->msg_name = &rx->connect_srx; | |
461 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 462 | } |
2341e077 DH |
463 | case RXRPC_SERVER_BOUND: |
464 | case RXRPC_SERVER_LISTENING: | |
465 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
466 | break; |
467 | default: | |
2341e077 | 468 | ret = -EINVAL; |
17926a79 DH |
469 | break; |
470 | } | |
471 | ||
2341e077 | 472 | error_unlock: |
17926a79 | 473 | release_sock(&rx->sk); |
17926a79 DH |
474 | _leave(" = %d", ret); |
475 | return ret; | |
476 | } | |
477 | ||
478 | /* | |
479 | * set RxRPC socket options | |
480 | */ | |
481 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 482 | char __user *optval, unsigned int optlen) |
17926a79 DH |
483 | { |
484 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 485 | unsigned int min_sec_level; |
17926a79 DH |
486 | int ret; |
487 | ||
488 | _enter(",%d,%d,,%d", level, optname, optlen); | |
489 | ||
490 | lock_sock(&rx->sk); | |
491 | ret = -EOPNOTSUPP; | |
492 | ||
493 | if (level == SOL_RXRPC) { | |
494 | switch (optname) { | |
495 | case RXRPC_EXCLUSIVE_CONNECTION: | |
496 | ret = -EINVAL; | |
497 | if (optlen != 0) | |
498 | goto error; | |
499 | ret = -EISCONN; | |
2341e077 | 500 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 501 | goto error; |
cc8feb8e | 502 | rx->exclusive = true; |
17926a79 DH |
503 | goto success; |
504 | ||
505 | case RXRPC_SECURITY_KEY: | |
506 | ret = -EINVAL; | |
507 | if (rx->key) | |
508 | goto error; | |
509 | ret = -EISCONN; | |
2341e077 | 510 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
511 | goto error; |
512 | ret = rxrpc_request_key(rx, optval, optlen); | |
513 | goto error; | |
514 | ||
515 | case RXRPC_SECURITY_KEYRING: | |
516 | ret = -EINVAL; | |
517 | if (rx->key) | |
518 | goto error; | |
519 | ret = -EISCONN; | |
2341e077 | 520 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
521 | goto error; |
522 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
523 | goto error; | |
524 | ||
525 | case RXRPC_MIN_SECURITY_LEVEL: | |
526 | ret = -EINVAL; | |
95c96174 | 527 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
528 | goto error; |
529 | ret = -EISCONN; | |
2341e077 | 530 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
531 | goto error; |
532 | ret = get_user(min_sec_level, | |
95c96174 | 533 | (unsigned int __user *) optval); |
17926a79 DH |
534 | if (ret < 0) |
535 | goto error; | |
536 | ret = -EINVAL; | |
537 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
538 | goto error; | |
539 | rx->min_sec_level = min_sec_level; | |
540 | goto success; | |
541 | ||
542 | default: | |
543 | break; | |
544 | } | |
545 | } | |
546 | ||
547 | success: | |
548 | ret = 0; | |
549 | error: | |
550 | release_sock(&rx->sk); | |
551 | return ret; | |
552 | } | |
553 | ||
554 | /* | |
555 | * permit an RxRPC socket to be polled | |
556 | */ | |
557 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
558 | poll_table *wait) | |
559 | { | |
560 | unsigned int mask; | |
561 | struct sock *sk = sock->sk; | |
562 | ||
aa395145 | 563 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
564 | mask = 0; |
565 | ||
566 | /* the socket is readable if there are any messages waiting on the Rx | |
567 | * queue */ | |
568 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
569 | mask |= POLLIN | POLLRDNORM; | |
570 | ||
571 | /* the socket is writable if there is space to add new data to the | |
572 | * socket; there is no guarantee that any particular call in progress | |
573 | * on the socket may have space in the Tx ACK window */ | |
574 | if (rxrpc_writable(sk)) | |
575 | mask |= POLLOUT | POLLWRNORM; | |
576 | ||
577 | return mask; | |
578 | } | |
579 | ||
580 | /* | |
581 | * create an RxRPC socket | |
582 | */ | |
3f378b68 EP |
583 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
584 | int kern) | |
17926a79 DH |
585 | { |
586 | struct rxrpc_sock *rx; | |
587 | struct sock *sk; | |
588 | ||
589 | _enter("%p,%d", sock, protocol); | |
590 | ||
09ad9bc7 | 591 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
592 | return -EAFNOSUPPORT; |
593 | ||
b4f1342f | 594 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
595 | if (protocol != PF_INET) |
596 | return -EPROTONOSUPPORT; | |
597 | ||
598 | if (sock->type != SOCK_DGRAM) | |
599 | return -ESOCKTNOSUPPORT; | |
600 | ||
601 | sock->ops = &rxrpc_rpc_ops; | |
602 | sock->state = SS_UNCONNECTED; | |
603 | ||
11aa9c28 | 604 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
605 | if (!sk) |
606 | return -ENOMEM; | |
607 | ||
608 | sock_init_data(sock, sk); | |
2341e077 | 609 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 610 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 611 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
612 | sk->sk_destruct = rxrpc_sock_destructor; |
613 | ||
614 | rx = rxrpc_sk(sk); | |
19ffa01c | 615 | rx->family = protocol; |
17926a79 DH |
616 | rx->calls = RB_ROOT; |
617 | ||
618 | INIT_LIST_HEAD(&rx->listen_link); | |
619 | INIT_LIST_HEAD(&rx->secureq); | |
620 | INIT_LIST_HEAD(&rx->acceptq); | |
621 | rwlock_init(&rx->call_lock); | |
622 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
623 | ||
624 | _leave(" = 0 [%p]", rx); | |
625 | return 0; | |
626 | } | |
627 | ||
628 | /* | |
629 | * RxRPC socket destructor | |
630 | */ | |
631 | static void rxrpc_sock_destructor(struct sock *sk) | |
632 | { | |
633 | _enter("%p", sk); | |
634 | ||
635 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
636 | ||
547b792c IJ |
637 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
638 | WARN_ON(!sk_unhashed(sk)); | |
639 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
640 | |
641 | if (!sock_flag(sk, SOCK_DEAD)) { | |
642 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
643 | return; | |
644 | } | |
645 | } | |
646 | ||
647 | /* | |
648 | * release an RxRPC socket | |
649 | */ | |
650 | static int rxrpc_release_sock(struct sock *sk) | |
651 | { | |
652 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
653 | ||
654 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
655 | ||
656 | /* declare the socket closed for business */ | |
657 | sock_orphan(sk); | |
658 | sk->sk_shutdown = SHUTDOWN_MASK; | |
659 | ||
660 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
661 | sk->sk_state = RXRPC_CLOSE; | |
662 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
663 | ||
664 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
665 | ||
666 | if (!list_empty(&rx->listen_link)) { | |
667 | write_lock_bh(&rx->local->services_lock); | |
668 | list_del(&rx->listen_link); | |
669 | write_unlock_bh(&rx->local->services_lock); | |
670 | } | |
671 | ||
672 | /* try to flush out this socket */ | |
673 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 674 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
675 | rxrpc_purge_queue(&sk->sk_receive_queue); |
676 | ||
17926a79 DH |
677 | if (rx->local) { |
678 | rxrpc_put_local(rx->local); | |
679 | rx->local = NULL; | |
680 | } | |
681 | ||
682 | key_put(rx->key); | |
683 | rx->key = NULL; | |
684 | key_put(rx->securities); | |
685 | rx->securities = NULL; | |
686 | sock_put(sk); | |
687 | ||
688 | _leave(" = 0"); | |
689 | return 0; | |
690 | } | |
691 | ||
692 | /* | |
693 | * release an RxRPC BSD socket on close() or equivalent | |
694 | */ | |
695 | static int rxrpc_release(struct socket *sock) | |
696 | { | |
697 | struct sock *sk = sock->sk; | |
698 | ||
699 | _enter("%p{%p}", sock, sk); | |
700 | ||
701 | if (!sk) | |
702 | return 0; | |
703 | ||
704 | sock->sk = NULL; | |
705 | ||
706 | return rxrpc_release_sock(sk); | |
707 | } | |
708 | ||
709 | /* | |
710 | * RxRPC network protocol | |
711 | */ | |
712 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 713 | .family = PF_RXRPC, |
17926a79 DH |
714 | .owner = THIS_MODULE, |
715 | .release = rxrpc_release, | |
716 | .bind = rxrpc_bind, | |
717 | .connect = rxrpc_connect, | |
718 | .socketpair = sock_no_socketpair, | |
719 | .accept = sock_no_accept, | |
720 | .getname = sock_no_getname, | |
721 | .poll = rxrpc_poll, | |
722 | .ioctl = sock_no_ioctl, | |
723 | .listen = rxrpc_listen, | |
724 | .shutdown = sock_no_shutdown, | |
725 | .setsockopt = rxrpc_setsockopt, | |
726 | .getsockopt = sock_no_getsockopt, | |
727 | .sendmsg = rxrpc_sendmsg, | |
728 | .recvmsg = rxrpc_recvmsg, | |
729 | .mmap = sock_no_mmap, | |
730 | .sendpage = sock_no_sendpage, | |
731 | }; | |
732 | ||
733 | static struct proto rxrpc_proto = { | |
734 | .name = "RXRPC", | |
735 | .owner = THIS_MODULE, | |
736 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 737 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
738 | }; |
739 | ||
ec1b4cf7 | 740 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
741 | .family = PF_RXRPC, |
742 | .create = rxrpc_create, | |
743 | .owner = THIS_MODULE, | |
744 | }; | |
745 | ||
746 | /* | |
747 | * initialise and register the RxRPC protocol | |
748 | */ | |
749 | static int __init af_rxrpc_init(void) | |
750 | { | |
17926a79 DH |
751 | int ret = -1; |
752 | ||
ce6654cf | 753 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 754 | |
0d12f8a4 | 755 | rxrpc_epoch = get_seconds(); |
17926a79 | 756 | |
651350d1 | 757 | ret = -ENOMEM; |
17926a79 DH |
758 | rxrpc_call_jar = kmem_cache_create( |
759 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 760 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 761 | if (!rxrpc_call_jar) { |
9b6d5398 | 762 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
763 | goto error_call_jar; |
764 | } | |
765 | ||
e1fcc7e2 | 766 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 767 | if (!rxrpc_workqueue) { |
9b6d5398 | 768 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
769 | goto error_work_queue; |
770 | } | |
771 | ||
648af7fc DH |
772 | ret = rxrpc_init_security(); |
773 | if (ret < 0) { | |
9b6d5398 | 774 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
775 | goto error_security; |
776 | } | |
777 | ||
17926a79 | 778 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 779 | if (ret < 0) { |
9b6d5398 | 780 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
781 | goto error_proto; |
782 | } | |
783 | ||
784 | ret = sock_register(&rxrpc_family_ops); | |
785 | if (ret < 0) { | |
9b6d5398 | 786 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
787 | goto error_sock; |
788 | } | |
789 | ||
790 | ret = register_key_type(&key_type_rxrpc); | |
791 | if (ret < 0) { | |
9b6d5398 | 792 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
793 | goto error_key_type; |
794 | } | |
795 | ||
796 | ret = register_key_type(&key_type_rxrpc_s); | |
797 | if (ret < 0) { | |
9b6d5398 | 798 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
799 | goto error_key_type_s; |
800 | } | |
801 | ||
5873c083 DH |
802 | ret = rxrpc_sysctl_init(); |
803 | if (ret < 0) { | |
9b6d5398 | 804 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
805 | goto error_sysctls; |
806 | } | |
807 | ||
17926a79 | 808 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
809 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
810 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
811 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
812 | #endif |
813 | return 0; | |
814 | ||
5873c083 DH |
815 | error_sysctls: |
816 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
817 | error_key_type_s: |
818 | unregister_key_type(&key_type_rxrpc); | |
819 | error_key_type: | |
820 | sock_unregister(PF_RXRPC); | |
821 | error_sock: | |
822 | proto_unregister(&rxrpc_proto); | |
823 | error_proto: | |
651350d1 | 824 | destroy_workqueue(rxrpc_workqueue); |
648af7fc DH |
825 | error_security: |
826 | rxrpc_exit_security(); | |
651350d1 | 827 | error_work_queue: |
17926a79 DH |
828 | kmem_cache_destroy(rxrpc_call_jar); |
829 | error_call_jar: | |
830 | return ret; | |
831 | } | |
832 | ||
833 | /* | |
834 | * unregister the RxRPC protocol | |
835 | */ | |
836 | static void __exit af_rxrpc_exit(void) | |
837 | { | |
838 | _enter(""); | |
5873c083 | 839 | rxrpc_sysctl_exit(); |
17926a79 DH |
840 | unregister_key_type(&key_type_rxrpc_s); |
841 | unregister_key_type(&key_type_rxrpc); | |
842 | sock_unregister(PF_RXRPC); | |
843 | proto_unregister(&rxrpc_proto); | |
844 | rxrpc_destroy_all_calls(); | |
845 | rxrpc_destroy_all_connections(); | |
846 | rxrpc_destroy_all_transports(); | |
17926a79 DH |
847 | |
848 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); | |
849 | ||
4f95dd78 DH |
850 | /* We need to flush the scheduled work twice because the local endpoint |
851 | * records involve a work item in their destruction as they can only be | |
852 | * destroyed from process context. However, a connection may have a | |
853 | * work item outstanding - and this will pin the local endpoint record | |
854 | * until the connection goes away. | |
855 | * | |
856 | * Peers don't pin locals and calls pin sockets - which prevents the | |
857 | * module from being unloaded - so we should only need two flushes. | |
858 | */ | |
17926a79 | 859 | _debug("flush scheduled work"); |
651350d1 | 860 | flush_workqueue(rxrpc_workqueue); |
4f95dd78 DH |
861 | _debug("flush scheduled work 2"); |
862 | flush_workqueue(rxrpc_workqueue); | |
863 | _debug("synchronise RCU"); | |
864 | rcu_barrier(); | |
865 | _debug("destroy locals"); | |
4a3388c8 DH |
866 | ASSERT(idr_is_empty(&rxrpc_client_conn_ids)); |
867 | idr_destroy(&rxrpc_client_conn_ids); | |
4f95dd78 DH |
868 | rxrpc_destroy_all_locals(); |
869 | ||
ece31ffd G |
870 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
871 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 872 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 873 | rxrpc_exit_security(); |
17926a79 DH |
874 | kmem_cache_destroy(rxrpc_call_jar); |
875 | _leave(""); | |
876 | } | |
877 | ||
878 | module_init(af_rxrpc_init); | |
879 | module_exit(af_rxrpc_exit); |