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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); | |
651350d1 DH |
283 | |
284 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
285 | ||
286 | lock_sock(&rx->sk); | |
287 | ||
19ffa01c DH |
288 | if (!key) |
289 | key = rx->key; | |
290 | if (key && !key->payload.data[0]) | |
291 | key = NULL; /* a no-security key */ | |
292 | ||
293 | memset(&cp, 0, sizeof(cp)); | |
294 | cp.local = rx->local; | |
295 | cp.key = key; | |
296 | cp.security_level = 0; | |
297 | cp.exclusive = false; | |
298 | cp.service_id = srx->srx_service; | |
299 | ||
300 | trans = rxrpc_name_to_transport(&cp, (struct sockaddr *)srx, | |
301 | sizeof(*srx), gfp); | |
2341e077 DH |
302 | if (IS_ERR(trans)) { |
303 | call = ERR_CAST(trans); | |
304 | trans = NULL; | |
305 | goto out_notrans; | |
651350d1 | 306 | } |
19ffa01c | 307 | cp.peer = trans->peer; |
651350d1 | 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 | ||
19ffa01c | 315 | call = rxrpc_new_client_call(rx, &cp, trans, bundle, user_call_ID, gfp); |
651350d1 DH |
316 | rxrpc_put_bundle(trans, bundle); |
317 | out: | |
318 | rxrpc_put_transport(trans); | |
15bde727 | 319 | out_notrans: |
651350d1 DH |
320 | release_sock(&rx->sk); |
321 | _leave(" = %p", call); | |
322 | return call; | |
323 | } | |
651350d1 DH |
324 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
325 | ||
326 | /** | |
327 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
328 | * @call: The call to end | |
329 | * | |
330 | * Allow a kernel service to end a call it was using. The call must be | |
331 | * complete before this is called (the call should be aborted if necessary). | |
332 | */ | |
333 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
334 | { | |
335 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
336 | rxrpc_remove_user_ID(call->socket, call); | |
337 | rxrpc_put_call(call); | |
338 | } | |
651350d1 DH |
339 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
340 | ||
341 | /** | |
342 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
343 | * @sock: The socket to intercept received messages on | |
344 | * @interceptor: The function to pass the messages to | |
345 | * | |
346 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
347 | * RxRPC socket. They get passed to the specified function instead. | |
348 | * @interceptor should free the socket buffers it is given. @interceptor is | |
349 | * called with the socket receive queue spinlock held and softirqs disabled - | |
350 | * this ensures that the messages will be delivered in the right order. | |
351 | */ | |
352 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
353 | rxrpc_interceptor_t interceptor) | |
354 | { | |
355 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
356 | ||
357 | _enter(""); | |
358 | rx->interceptor = interceptor; | |
359 | } | |
360 | ||
361 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
362 | ||
17926a79 DH |
363 | /* |
364 | * connect an RxRPC socket | |
365 | * - this just targets it at a specific destination; no actual connection | |
366 | * negotiation takes place | |
367 | */ | |
368 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
369 | int addr_len, int flags) | |
370 | { | |
2341e077 DH |
371 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
372 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
373 | int ret; |
374 | ||
375 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
376 | ||
377 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
378 | if (ret < 0) { | |
379 | _leave(" = %d [bad addr]", ret); | |
380 | return ret; | |
381 | } | |
382 | ||
383 | lock_sock(&rx->sk); | |
384 | ||
2341e077 DH |
385 | ret = -EISCONN; |
386 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
387 | goto error; | |
388 | ||
17926a79 | 389 | switch (rx->sk.sk_state) { |
2341e077 DH |
390 | case RXRPC_UNBOUND: |
391 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
392 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
393 | case RXRPC_CLIENT_BOUND: |
394 | break; | |
17926a79 | 395 | default: |
2341e077 DH |
396 | ret = -EBUSY; |
397 | goto error; | |
17926a79 DH |
398 | } |
399 | ||
2341e077 DH |
400 | rx->connect_srx = *srx; |
401 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
402 | ret = 0; | |
17926a79 | 403 | |
2341e077 | 404 | error: |
17926a79 | 405 | release_sock(&rx->sk); |
2341e077 | 406 | return ret; |
17926a79 DH |
407 | } |
408 | ||
409 | /* | |
410 | * send a message through an RxRPC socket | |
411 | * - in a client this does a number of things: | |
412 | * - finds/sets up a connection for the security specified (if any) | |
413 | * - initiates a call (ID in control data) | |
414 | * - ends the request phase of a call (if MSG_MORE is not set) | |
415 | * - sends a call data packet | |
416 | * - may send an abort (abort code in control data) | |
417 | */ | |
1b784140 | 418 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 419 | { |
2341e077 | 420 | struct rxrpc_local *local; |
17926a79 DH |
421 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
422 | int ret; | |
423 | ||
424 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
425 | ||
426 | if (m->msg_flags & MSG_OOB) | |
427 | return -EOPNOTSUPP; | |
428 | ||
429 | if (m->msg_name) { | |
430 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
431 | if (ret < 0) { | |
432 | _leave(" = %d [bad addr]", ret); | |
433 | return ret; | |
434 | } | |
435 | } | |
436 | ||
17926a79 DH |
437 | lock_sock(&rx->sk); |
438 | ||
17926a79 | 439 | switch (rx->sk.sk_state) { |
2341e077 DH |
440 | case RXRPC_UNBOUND: |
441 | local = rxrpc_lookup_local(&rx->srx); | |
442 | if (IS_ERR(local)) { | |
443 | ret = PTR_ERR(local); | |
444 | goto error_unlock; | |
17926a79 | 445 | } |
2341e077 DH |
446 | |
447 | rx->local = local; | |
448 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
449 | /* Fall through */ | |
450 | ||
451 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 452 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
453 | if (!m->msg_name && |
454 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
455 | m->msg_name = &rx->connect_srx; | |
456 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 457 | } |
2341e077 DH |
458 | case RXRPC_SERVER_BOUND: |
459 | case RXRPC_SERVER_LISTENING: | |
460 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
461 | break; |
462 | default: | |
2341e077 | 463 | ret = -EINVAL; |
17926a79 DH |
464 | break; |
465 | } | |
466 | ||
2341e077 | 467 | error_unlock: |
17926a79 | 468 | release_sock(&rx->sk); |
17926a79 DH |
469 | _leave(" = %d", ret); |
470 | return ret; | |
471 | } | |
472 | ||
473 | /* | |
474 | * set RxRPC socket options | |
475 | */ | |
476 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 477 | char __user *optval, unsigned int optlen) |
17926a79 DH |
478 | { |
479 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 480 | unsigned int min_sec_level; |
17926a79 DH |
481 | int ret; |
482 | ||
483 | _enter(",%d,%d,,%d", level, optname, optlen); | |
484 | ||
485 | lock_sock(&rx->sk); | |
486 | ret = -EOPNOTSUPP; | |
487 | ||
488 | if (level == SOL_RXRPC) { | |
489 | switch (optname) { | |
490 | case RXRPC_EXCLUSIVE_CONNECTION: | |
491 | ret = -EINVAL; | |
492 | if (optlen != 0) | |
493 | goto error; | |
494 | ret = -EISCONN; | |
2341e077 | 495 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
496 | goto error; |
497 | set_bit(RXRPC_SOCK_EXCLUSIVE_CONN, &rx->flags); | |
498 | goto success; | |
499 | ||
500 | case RXRPC_SECURITY_KEY: | |
501 | ret = -EINVAL; | |
502 | if (rx->key) | |
503 | goto error; | |
504 | ret = -EISCONN; | |
2341e077 | 505 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
506 | goto error; |
507 | ret = rxrpc_request_key(rx, optval, optlen); | |
508 | goto error; | |
509 | ||
510 | case RXRPC_SECURITY_KEYRING: | |
511 | ret = -EINVAL; | |
512 | if (rx->key) | |
513 | goto error; | |
514 | ret = -EISCONN; | |
2341e077 | 515 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
516 | goto error; |
517 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
518 | goto error; | |
519 | ||
520 | case RXRPC_MIN_SECURITY_LEVEL: | |
521 | ret = -EINVAL; | |
95c96174 | 522 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
523 | goto error; |
524 | ret = -EISCONN; | |
2341e077 | 525 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
526 | goto error; |
527 | ret = get_user(min_sec_level, | |
95c96174 | 528 | (unsigned int __user *) optval); |
17926a79 DH |
529 | if (ret < 0) |
530 | goto error; | |
531 | ret = -EINVAL; | |
532 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
533 | goto error; | |
534 | rx->min_sec_level = min_sec_level; | |
535 | goto success; | |
536 | ||
537 | default: | |
538 | break; | |
539 | } | |
540 | } | |
541 | ||
542 | success: | |
543 | ret = 0; | |
544 | error: | |
545 | release_sock(&rx->sk); | |
546 | return ret; | |
547 | } | |
548 | ||
549 | /* | |
550 | * permit an RxRPC socket to be polled | |
551 | */ | |
552 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
553 | poll_table *wait) | |
554 | { | |
555 | unsigned int mask; | |
556 | struct sock *sk = sock->sk; | |
557 | ||
aa395145 | 558 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
559 | mask = 0; |
560 | ||
561 | /* the socket is readable if there are any messages waiting on the Rx | |
562 | * queue */ | |
563 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
564 | mask |= POLLIN | POLLRDNORM; | |
565 | ||
566 | /* the socket is writable if there is space to add new data to the | |
567 | * socket; there is no guarantee that any particular call in progress | |
568 | * on the socket may have space in the Tx ACK window */ | |
569 | if (rxrpc_writable(sk)) | |
570 | mask |= POLLOUT | POLLWRNORM; | |
571 | ||
572 | return mask; | |
573 | } | |
574 | ||
575 | /* | |
576 | * create an RxRPC socket | |
577 | */ | |
3f378b68 EP |
578 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
579 | int kern) | |
17926a79 DH |
580 | { |
581 | struct rxrpc_sock *rx; | |
582 | struct sock *sk; | |
583 | ||
584 | _enter("%p,%d", sock, protocol); | |
585 | ||
09ad9bc7 | 586 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
587 | return -EAFNOSUPPORT; |
588 | ||
b4f1342f | 589 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
590 | if (protocol != PF_INET) |
591 | return -EPROTONOSUPPORT; | |
592 | ||
593 | if (sock->type != SOCK_DGRAM) | |
594 | return -ESOCKTNOSUPPORT; | |
595 | ||
596 | sock->ops = &rxrpc_rpc_ops; | |
597 | sock->state = SS_UNCONNECTED; | |
598 | ||
11aa9c28 | 599 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
600 | if (!sk) |
601 | return -ENOMEM; | |
602 | ||
603 | sock_init_data(sock, sk); | |
2341e077 | 604 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 605 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 606 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
607 | sk->sk_destruct = rxrpc_sock_destructor; |
608 | ||
609 | rx = rxrpc_sk(sk); | |
19ffa01c | 610 | rx->family = protocol; |
17926a79 DH |
611 | rx->calls = RB_ROOT; |
612 | ||
613 | INIT_LIST_HEAD(&rx->listen_link); | |
614 | INIT_LIST_HEAD(&rx->secureq); | |
615 | INIT_LIST_HEAD(&rx->acceptq); | |
616 | rwlock_init(&rx->call_lock); | |
617 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
618 | ||
619 | _leave(" = 0 [%p]", rx); | |
620 | return 0; | |
621 | } | |
622 | ||
623 | /* | |
624 | * RxRPC socket destructor | |
625 | */ | |
626 | static void rxrpc_sock_destructor(struct sock *sk) | |
627 | { | |
628 | _enter("%p", sk); | |
629 | ||
630 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
631 | ||
547b792c IJ |
632 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
633 | WARN_ON(!sk_unhashed(sk)); | |
634 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
635 | |
636 | if (!sock_flag(sk, SOCK_DEAD)) { | |
637 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
638 | return; | |
639 | } | |
640 | } | |
641 | ||
642 | /* | |
643 | * release an RxRPC socket | |
644 | */ | |
645 | static int rxrpc_release_sock(struct sock *sk) | |
646 | { | |
647 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
648 | ||
649 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
650 | ||
651 | /* declare the socket closed for business */ | |
652 | sock_orphan(sk); | |
653 | sk->sk_shutdown = SHUTDOWN_MASK; | |
654 | ||
655 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
656 | sk->sk_state = RXRPC_CLOSE; | |
657 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
658 | ||
659 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
660 | ||
661 | if (!list_empty(&rx->listen_link)) { | |
662 | write_lock_bh(&rx->local->services_lock); | |
663 | list_del(&rx->listen_link); | |
664 | write_unlock_bh(&rx->local->services_lock); | |
665 | } | |
666 | ||
667 | /* try to flush out this socket */ | |
668 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 669 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
670 | rxrpc_purge_queue(&sk->sk_receive_queue); |
671 | ||
672 | if (rx->conn) { | |
673 | rxrpc_put_connection(rx->conn); | |
674 | rx->conn = NULL; | |
675 | } | |
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"); | |
866 | rxrpc_destroy_all_locals(); | |
867 | ||
ece31ffd G |
868 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
869 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 870 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 871 | rxrpc_exit_security(); |
17926a79 DH |
872 | kmem_cache_destroy(rxrpc_call_jar); |
873 | _leave(""); | |
874 | } | |
875 | ||
876 | module_init(af_rxrpc_init); | |
877 | module_exit(af_rxrpc_exit); |