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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> | |
df844fd4 | 25 | #define CREATE_TRACE_POINTS |
17926a79 DH |
26 | #include "ar-internal.h" |
27 | ||
28 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
29 | MODULE_AUTHOR("Red Hat, Inc."); | |
30 | MODULE_LICENSE("GPL"); | |
31 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
32 | ||
95c96174 | 33 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 34 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 35 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 | 36 | |
17926a79 DH |
37 | static struct proto rxrpc_proto; |
38 | static const struct proto_ops rxrpc_rpc_ops; | |
39 | ||
40 | /* local epoch for detecting local-end reset */ | |
0d12f8a4 | 41 | u32 rxrpc_epoch; |
17926a79 DH |
42 | |
43 | /* current debugging ID */ | |
44 | atomic_t rxrpc_debug_id; | |
45 | ||
46 | /* count of skbs currently in use */ | |
47 | atomic_t rxrpc_n_skbs; | |
48 | ||
651350d1 DH |
49 | struct workqueue_struct *rxrpc_workqueue; |
50 | ||
17926a79 DH |
51 | static void rxrpc_sock_destructor(struct sock *); |
52 | ||
53 | /* | |
54 | * see if an RxRPC socket is currently writable | |
55 | */ | |
56 | static inline int rxrpc_writable(struct sock *sk) | |
57 | { | |
58 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
59 | } | |
60 | ||
61 | /* | |
62 | * wait for write bufferage to become available | |
63 | */ | |
64 | static void rxrpc_write_space(struct sock *sk) | |
65 | { | |
66 | _enter("%p", sk); | |
43815482 | 67 | rcu_read_lock(); |
17926a79 | 68 | if (rxrpc_writable(sk)) { |
43815482 ED |
69 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
70 | ||
1ce0bf50 | 71 | if (skwq_has_sleeper(wq)) |
43815482 | 72 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 73 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 74 | } |
43815482 | 75 | rcu_read_unlock(); |
17926a79 DH |
76 | } |
77 | ||
78 | /* | |
79 | * validate an RxRPC address | |
80 | */ | |
81 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
82 | struct sockaddr_rxrpc *srx, | |
83 | int len) | |
84 | { | |
dad8aff7 | 85 | unsigned int tail; |
ab802ee0 | 86 | |
17926a79 DH |
87 | if (len < sizeof(struct sockaddr_rxrpc)) |
88 | return -EINVAL; | |
89 | ||
90 | if (srx->srx_family != AF_RXRPC) | |
91 | return -EAFNOSUPPORT; | |
92 | ||
93 | if (srx->transport_type != SOCK_DGRAM) | |
94 | return -ESOCKTNOSUPPORT; | |
95 | ||
96 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
97 | if (srx->transport_len < sizeof(sa_family_t) || | |
98 | srx->transport_len > len) | |
99 | return -EINVAL; | |
100 | ||
19ffa01c | 101 | if (srx->transport.family != rx->family) |
17926a79 DH |
102 | return -EAFNOSUPPORT; |
103 | ||
104 | switch (srx->transport.family) { | |
105 | case AF_INET: | |
4f95dd78 DH |
106 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
107 | return -EINVAL; | |
21454aaa | 108 | _debug("INET: %x @ %pI4", |
17926a79 | 109 | ntohs(srx->transport.sin.sin_port), |
21454aaa | 110 | &srx->transport.sin.sin_addr); |
ab802ee0 | 111 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
112 | break; |
113 | ||
114 | case AF_INET6: | |
115 | default: | |
116 | return -EAFNOSUPPORT; | |
117 | } | |
118 | ||
ab802ee0 DH |
119 | if (tail < len) |
120 | memset((void *)srx + tail, 0, len - tail); | |
17926a79 DH |
121 | return 0; |
122 | } | |
123 | ||
124 | /* | |
125 | * bind a local address to an RxRPC socket | |
126 | */ | |
127 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
128 | { | |
b4f1342f | 129 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
130 | struct sock *sk = sock->sk; |
131 | struct rxrpc_local *local; | |
132 | struct rxrpc_sock *rx = rxrpc_sk(sk), *prx; | |
17926a79 DH |
133 | int ret; |
134 | ||
135 | _enter("%p,%p,%d", rx, saddr, len); | |
136 | ||
137 | ret = rxrpc_validate_address(rx, srx, len); | |
138 | if (ret < 0) | |
139 | goto error; | |
140 | ||
141 | lock_sock(&rx->sk); | |
142 | ||
2341e077 | 143 | if (rx->sk.sk_state != RXRPC_UNBOUND) { |
17926a79 DH |
144 | ret = -EINVAL; |
145 | goto error_unlock; | |
146 | } | |
147 | ||
148 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
149 | ||
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 | ||
2341e077 | 156 | if (rx->srx.srx_service) { |
17926a79 DH |
157 | write_lock_bh(&local->services_lock); |
158 | list_for_each_entry(prx, &local->services, listen_link) { | |
2341e077 | 159 | if (prx->srx.srx_service == rx->srx.srx_service) |
17926a79 DH |
160 | goto service_in_use; |
161 | } | |
162 | ||
2341e077 | 163 | rx->local = local; |
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 { | |
2341e077 | 169 | rx->local = local; |
17926a79 DH |
170 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; |
171 | } | |
172 | ||
173 | release_sock(&rx->sk); | |
174 | _leave(" = 0"); | |
175 | return 0; | |
176 | ||
177 | service_in_use: | |
17926a79 | 178 | write_unlock_bh(&local->services_lock); |
2341e077 DH |
179 | rxrpc_put_local(local); |
180 | ret = -EADDRINUSE; | |
17926a79 DH |
181 | error_unlock: |
182 | release_sock(&rx->sk); | |
183 | error: | |
184 | _leave(" = %d", ret); | |
185 | return ret; | |
186 | } | |
187 | ||
188 | /* | |
189 | * set the number of pending calls permitted on a listening socket | |
190 | */ | |
191 | static int rxrpc_listen(struct socket *sock, int backlog) | |
192 | { | |
193 | struct sock *sk = sock->sk; | |
194 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
0e119b41 | 195 | unsigned int max; |
17926a79 DH |
196 | int ret; |
197 | ||
198 | _enter("%p,%d", rx, backlog); | |
199 | ||
200 | lock_sock(&rx->sk); | |
201 | ||
202 | switch (rx->sk.sk_state) { | |
2341e077 | 203 | case RXRPC_UNBOUND: |
17926a79 DH |
204 | ret = -EADDRNOTAVAIL; |
205 | break; | |
17926a79 DH |
206 | case RXRPC_SERVER_BOUND: |
207 | ASSERT(rx->local != NULL); | |
0e119b41 DH |
208 | max = READ_ONCE(rxrpc_max_backlog); |
209 | ret = -EINVAL; | |
210 | if (backlog == INT_MAX) | |
211 | backlog = max; | |
212 | else if (backlog < 0 || backlog > max) | |
213 | break; | |
17926a79 DH |
214 | sk->sk_max_ack_backlog = backlog; |
215 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
216 | ret = 0; | |
217 | break; | |
0e119b41 DH |
218 | default: |
219 | ret = -EBUSY; | |
220 | break; | |
17926a79 DH |
221 | } |
222 | ||
223 | release_sock(&rx->sk); | |
224 | _leave(" = %d", ret); | |
225 | return ret; | |
226 | } | |
227 | ||
651350d1 DH |
228 | /** |
229 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
230 | * @sock: The socket on which to make the call | |
2341e077 | 231 | * @srx: The address of the peer to contact |
651350d1 DH |
232 | * @key: The security context to use (defaults to socket setting) |
233 | * @user_call_ID: The ID to use | |
234 | * | |
235 | * Allow a kernel service to begin a call on the nominated socket. This just | |
236 | * sets up all the internal tracking structures and allocates connection and | |
237 | * call IDs as appropriate. The call to be used is returned. | |
238 | * | |
239 | * The default socket destination address and security may be overridden by | |
240 | * supplying @srx and @key. | |
241 | */ | |
242 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
243 | struct sockaddr_rxrpc *srx, | |
244 | struct key *key, | |
245 | unsigned long user_call_ID, | |
246 | gfp_t gfp) | |
247 | { | |
19ffa01c | 248 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
249 | struct rxrpc_call *call; |
250 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 251 | int ret; |
651350d1 DH |
252 | |
253 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
254 | ||
f4552c2d DH |
255 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
256 | if (ret < 0) | |
257 | return ERR_PTR(ret); | |
258 | ||
651350d1 DH |
259 | lock_sock(&rx->sk); |
260 | ||
19ffa01c DH |
261 | if (!key) |
262 | key = rx->key; | |
263 | if (key && !key->payload.data[0]) | |
264 | key = NULL; /* a no-security key */ | |
265 | ||
266 | memset(&cp, 0, sizeof(cp)); | |
267 | cp.local = rx->local; | |
268 | cp.key = key; | |
269 | cp.security_level = 0; | |
270 | cp.exclusive = false; | |
271 | cp.service_id = srx->srx_service; | |
aa390bbe | 272 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp); |
19ffa01c | 273 | |
651350d1 DH |
274 | release_sock(&rx->sk); |
275 | _leave(" = %p", call); | |
276 | return call; | |
277 | } | |
651350d1 DH |
278 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
279 | ||
280 | /** | |
281 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
4de48af6 | 282 | * @sock: The socket the call is on |
651350d1 DH |
283 | * @call: The call to end |
284 | * | |
285 | * Allow a kernel service to end a call it was using. The call must be | |
286 | * complete before this is called (the call should be aborted if necessary). | |
287 | */ | |
4de48af6 | 288 | void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call) |
651350d1 DH |
289 | { |
290 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
4de48af6 | 291 | rxrpc_remove_user_ID(rxrpc_sk(sock->sk), call); |
651350d1 DH |
292 | rxrpc_put_call(call); |
293 | } | |
651350d1 DH |
294 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
295 | ||
296 | /** | |
297 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
298 | * @sock: The socket to intercept received messages on | |
299 | * @interceptor: The function to pass the messages to | |
300 | * | |
301 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
302 | * RxRPC socket. They get passed to the specified function instead. | |
303 | * @interceptor should free the socket buffers it is given. @interceptor is | |
304 | * called with the socket receive queue spinlock held and softirqs disabled - | |
305 | * this ensures that the messages will be delivered in the right order. | |
306 | */ | |
307 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
308 | rxrpc_interceptor_t interceptor) | |
309 | { | |
310 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
311 | ||
312 | _enter(""); | |
313 | rx->interceptor = interceptor; | |
314 | } | |
315 | ||
316 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
317 | ||
17926a79 DH |
318 | /* |
319 | * connect an RxRPC socket | |
320 | * - this just targets it at a specific destination; no actual connection | |
321 | * negotiation takes place | |
322 | */ | |
323 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
324 | int addr_len, int flags) | |
325 | { | |
2341e077 DH |
326 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
327 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
328 | int ret; |
329 | ||
330 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
331 | ||
332 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
333 | if (ret < 0) { | |
334 | _leave(" = %d [bad addr]", ret); | |
335 | return ret; | |
336 | } | |
337 | ||
338 | lock_sock(&rx->sk); | |
339 | ||
2341e077 DH |
340 | ret = -EISCONN; |
341 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
342 | goto error; | |
343 | ||
17926a79 | 344 | switch (rx->sk.sk_state) { |
2341e077 DH |
345 | case RXRPC_UNBOUND: |
346 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
347 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
348 | case RXRPC_CLIENT_BOUND: |
349 | break; | |
17926a79 | 350 | default: |
2341e077 DH |
351 | ret = -EBUSY; |
352 | goto error; | |
17926a79 DH |
353 | } |
354 | ||
2341e077 DH |
355 | rx->connect_srx = *srx; |
356 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
357 | ret = 0; | |
17926a79 | 358 | |
2341e077 | 359 | error: |
17926a79 | 360 | release_sock(&rx->sk); |
2341e077 | 361 | return ret; |
17926a79 DH |
362 | } |
363 | ||
364 | /* | |
365 | * send a message through an RxRPC socket | |
366 | * - in a client this does a number of things: | |
367 | * - finds/sets up a connection for the security specified (if any) | |
368 | * - initiates a call (ID in control data) | |
369 | * - ends the request phase of a call (if MSG_MORE is not set) | |
370 | * - sends a call data packet | |
371 | * - may send an abort (abort code in control data) | |
372 | */ | |
1b784140 | 373 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 374 | { |
2341e077 | 375 | struct rxrpc_local *local; |
17926a79 DH |
376 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
377 | int ret; | |
378 | ||
379 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
380 | ||
381 | if (m->msg_flags & MSG_OOB) | |
382 | return -EOPNOTSUPP; | |
383 | ||
384 | if (m->msg_name) { | |
385 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
386 | if (ret < 0) { | |
387 | _leave(" = %d [bad addr]", ret); | |
388 | return ret; | |
389 | } | |
390 | } | |
391 | ||
17926a79 DH |
392 | lock_sock(&rx->sk); |
393 | ||
17926a79 | 394 | switch (rx->sk.sk_state) { |
2341e077 DH |
395 | case RXRPC_UNBOUND: |
396 | local = rxrpc_lookup_local(&rx->srx); | |
397 | if (IS_ERR(local)) { | |
398 | ret = PTR_ERR(local); | |
399 | goto error_unlock; | |
17926a79 | 400 | } |
2341e077 DH |
401 | |
402 | rx->local = local; | |
403 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
404 | /* Fall through */ | |
405 | ||
406 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 407 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
408 | if (!m->msg_name && |
409 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
410 | m->msg_name = &rx->connect_srx; | |
411 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 412 | } |
2341e077 DH |
413 | case RXRPC_SERVER_BOUND: |
414 | case RXRPC_SERVER_LISTENING: | |
415 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
416 | break; |
417 | default: | |
2341e077 | 418 | ret = -EINVAL; |
17926a79 DH |
419 | break; |
420 | } | |
421 | ||
2341e077 | 422 | error_unlock: |
17926a79 | 423 | release_sock(&rx->sk); |
17926a79 DH |
424 | _leave(" = %d", ret); |
425 | return ret; | |
426 | } | |
427 | ||
428 | /* | |
429 | * set RxRPC socket options | |
430 | */ | |
431 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 432 | char __user *optval, unsigned int optlen) |
17926a79 DH |
433 | { |
434 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 435 | unsigned int min_sec_level; |
17926a79 DH |
436 | int ret; |
437 | ||
438 | _enter(",%d,%d,,%d", level, optname, optlen); | |
439 | ||
440 | lock_sock(&rx->sk); | |
441 | ret = -EOPNOTSUPP; | |
442 | ||
443 | if (level == SOL_RXRPC) { | |
444 | switch (optname) { | |
445 | case RXRPC_EXCLUSIVE_CONNECTION: | |
446 | ret = -EINVAL; | |
447 | if (optlen != 0) | |
448 | goto error; | |
449 | ret = -EISCONN; | |
2341e077 | 450 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 451 | goto error; |
cc8feb8e | 452 | rx->exclusive = true; |
17926a79 DH |
453 | goto success; |
454 | ||
455 | case RXRPC_SECURITY_KEY: | |
456 | ret = -EINVAL; | |
457 | if (rx->key) | |
458 | goto error; | |
459 | ret = -EISCONN; | |
2341e077 | 460 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
461 | goto error; |
462 | ret = rxrpc_request_key(rx, optval, optlen); | |
463 | goto error; | |
464 | ||
465 | case RXRPC_SECURITY_KEYRING: | |
466 | ret = -EINVAL; | |
467 | if (rx->key) | |
468 | goto error; | |
469 | ret = -EISCONN; | |
2341e077 | 470 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
471 | goto error; |
472 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
473 | goto error; | |
474 | ||
475 | case RXRPC_MIN_SECURITY_LEVEL: | |
476 | ret = -EINVAL; | |
95c96174 | 477 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
478 | goto error; |
479 | ret = -EISCONN; | |
2341e077 | 480 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
481 | goto error; |
482 | ret = get_user(min_sec_level, | |
95c96174 | 483 | (unsigned int __user *) optval); |
17926a79 DH |
484 | if (ret < 0) |
485 | goto error; | |
486 | ret = -EINVAL; | |
487 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
488 | goto error; | |
489 | rx->min_sec_level = min_sec_level; | |
490 | goto success; | |
491 | ||
492 | default: | |
493 | break; | |
494 | } | |
495 | } | |
496 | ||
497 | success: | |
498 | ret = 0; | |
499 | error: | |
500 | release_sock(&rx->sk); | |
501 | return ret; | |
502 | } | |
503 | ||
504 | /* | |
505 | * permit an RxRPC socket to be polled | |
506 | */ | |
507 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
508 | poll_table *wait) | |
509 | { | |
510 | unsigned int mask; | |
511 | struct sock *sk = sock->sk; | |
512 | ||
aa395145 | 513 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
514 | mask = 0; |
515 | ||
516 | /* the socket is readable if there are any messages waiting on the Rx | |
517 | * queue */ | |
518 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
519 | mask |= POLLIN | POLLRDNORM; | |
520 | ||
521 | /* the socket is writable if there is space to add new data to the | |
522 | * socket; there is no guarantee that any particular call in progress | |
523 | * on the socket may have space in the Tx ACK window */ | |
524 | if (rxrpc_writable(sk)) | |
525 | mask |= POLLOUT | POLLWRNORM; | |
526 | ||
527 | return mask; | |
528 | } | |
529 | ||
530 | /* | |
531 | * create an RxRPC socket | |
532 | */ | |
3f378b68 EP |
533 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
534 | int kern) | |
17926a79 DH |
535 | { |
536 | struct rxrpc_sock *rx; | |
537 | struct sock *sk; | |
538 | ||
539 | _enter("%p,%d", sock, protocol); | |
540 | ||
09ad9bc7 | 541 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
542 | return -EAFNOSUPPORT; |
543 | ||
b4f1342f | 544 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
545 | if (protocol != PF_INET) |
546 | return -EPROTONOSUPPORT; | |
547 | ||
548 | if (sock->type != SOCK_DGRAM) | |
549 | return -ESOCKTNOSUPPORT; | |
550 | ||
551 | sock->ops = &rxrpc_rpc_ops; | |
552 | sock->state = SS_UNCONNECTED; | |
553 | ||
11aa9c28 | 554 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
555 | if (!sk) |
556 | return -ENOMEM; | |
557 | ||
558 | sock_init_data(sock, sk); | |
2341e077 | 559 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 560 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 561 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
562 | sk->sk_destruct = rxrpc_sock_destructor; |
563 | ||
564 | rx = rxrpc_sk(sk); | |
19ffa01c | 565 | rx->family = protocol; |
17926a79 DH |
566 | rx->calls = RB_ROOT; |
567 | ||
568 | INIT_LIST_HEAD(&rx->listen_link); | |
569 | INIT_LIST_HEAD(&rx->secureq); | |
570 | INIT_LIST_HEAD(&rx->acceptq); | |
571 | rwlock_init(&rx->call_lock); | |
572 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
573 | ||
574 | _leave(" = 0 [%p]", rx); | |
575 | return 0; | |
576 | } | |
577 | ||
578 | /* | |
579 | * RxRPC socket destructor | |
580 | */ | |
581 | static void rxrpc_sock_destructor(struct sock *sk) | |
582 | { | |
583 | _enter("%p", sk); | |
584 | ||
585 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
586 | ||
547b792c IJ |
587 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
588 | WARN_ON(!sk_unhashed(sk)); | |
589 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
590 | |
591 | if (!sock_flag(sk, SOCK_DEAD)) { | |
592 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
593 | return; | |
594 | } | |
595 | } | |
596 | ||
597 | /* | |
598 | * release an RxRPC socket | |
599 | */ | |
600 | static int rxrpc_release_sock(struct sock *sk) | |
601 | { | |
602 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
603 | ||
604 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
605 | ||
606 | /* declare the socket closed for business */ | |
607 | sock_orphan(sk); | |
608 | sk->sk_shutdown = SHUTDOWN_MASK; | |
609 | ||
610 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
611 | sk->sk_state = RXRPC_CLOSE; | |
612 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
613 | ||
614 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
615 | ||
616 | if (!list_empty(&rx->listen_link)) { | |
617 | write_lock_bh(&rx->local->services_lock); | |
618 | list_del(&rx->listen_link); | |
619 | write_unlock_bh(&rx->local->services_lock); | |
620 | } | |
621 | ||
622 | /* try to flush out this socket */ | |
623 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 624 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
625 | rxrpc_purge_queue(&sk->sk_receive_queue); |
626 | ||
5627cc8b DH |
627 | rxrpc_put_local(rx->local); |
628 | rx->local = NULL; | |
17926a79 DH |
629 | key_put(rx->key); |
630 | rx->key = NULL; | |
631 | key_put(rx->securities); | |
632 | rx->securities = NULL; | |
633 | sock_put(sk); | |
634 | ||
635 | _leave(" = 0"); | |
636 | return 0; | |
637 | } | |
638 | ||
639 | /* | |
640 | * release an RxRPC BSD socket on close() or equivalent | |
641 | */ | |
642 | static int rxrpc_release(struct socket *sock) | |
643 | { | |
644 | struct sock *sk = sock->sk; | |
645 | ||
646 | _enter("%p{%p}", sock, sk); | |
647 | ||
648 | if (!sk) | |
649 | return 0; | |
650 | ||
651 | sock->sk = NULL; | |
652 | ||
653 | return rxrpc_release_sock(sk); | |
654 | } | |
655 | ||
656 | /* | |
657 | * RxRPC network protocol | |
658 | */ | |
659 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 660 | .family = PF_RXRPC, |
17926a79 DH |
661 | .owner = THIS_MODULE, |
662 | .release = rxrpc_release, | |
663 | .bind = rxrpc_bind, | |
664 | .connect = rxrpc_connect, | |
665 | .socketpair = sock_no_socketpair, | |
666 | .accept = sock_no_accept, | |
667 | .getname = sock_no_getname, | |
668 | .poll = rxrpc_poll, | |
669 | .ioctl = sock_no_ioctl, | |
670 | .listen = rxrpc_listen, | |
671 | .shutdown = sock_no_shutdown, | |
672 | .setsockopt = rxrpc_setsockopt, | |
673 | .getsockopt = sock_no_getsockopt, | |
674 | .sendmsg = rxrpc_sendmsg, | |
675 | .recvmsg = rxrpc_recvmsg, | |
676 | .mmap = sock_no_mmap, | |
677 | .sendpage = sock_no_sendpage, | |
678 | }; | |
679 | ||
680 | static struct proto rxrpc_proto = { | |
681 | .name = "RXRPC", | |
682 | .owner = THIS_MODULE, | |
683 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 684 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
685 | }; |
686 | ||
ec1b4cf7 | 687 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
688 | .family = PF_RXRPC, |
689 | .create = rxrpc_create, | |
690 | .owner = THIS_MODULE, | |
691 | }; | |
692 | ||
693 | /* | |
694 | * initialise and register the RxRPC protocol | |
695 | */ | |
696 | static int __init af_rxrpc_init(void) | |
697 | { | |
17926a79 DH |
698 | int ret = -1; |
699 | ||
ce6654cf | 700 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 701 | |
0d12f8a4 | 702 | rxrpc_epoch = get_seconds(); |
17926a79 | 703 | |
651350d1 | 704 | ret = -ENOMEM; |
17926a79 DH |
705 | rxrpc_call_jar = kmem_cache_create( |
706 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 707 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 708 | if (!rxrpc_call_jar) { |
9b6d5398 | 709 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
710 | goto error_call_jar; |
711 | } | |
712 | ||
e1fcc7e2 | 713 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 714 | if (!rxrpc_workqueue) { |
9b6d5398 | 715 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
716 | goto error_work_queue; |
717 | } | |
718 | ||
648af7fc DH |
719 | ret = rxrpc_init_security(); |
720 | if (ret < 0) { | |
9b6d5398 | 721 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
722 | goto error_security; |
723 | } | |
724 | ||
17926a79 | 725 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 726 | if (ret < 0) { |
9b6d5398 | 727 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
728 | goto error_proto; |
729 | } | |
730 | ||
731 | ret = sock_register(&rxrpc_family_ops); | |
732 | if (ret < 0) { | |
9b6d5398 | 733 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
734 | goto error_sock; |
735 | } | |
736 | ||
737 | ret = register_key_type(&key_type_rxrpc); | |
738 | if (ret < 0) { | |
9b6d5398 | 739 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
740 | goto error_key_type; |
741 | } | |
742 | ||
743 | ret = register_key_type(&key_type_rxrpc_s); | |
744 | if (ret < 0) { | |
9b6d5398 | 745 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
746 | goto error_key_type_s; |
747 | } | |
748 | ||
5873c083 DH |
749 | ret = rxrpc_sysctl_init(); |
750 | if (ret < 0) { | |
9b6d5398 | 751 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
752 | goto error_sysctls; |
753 | } | |
754 | ||
17926a79 | 755 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
756 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
757 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
758 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
759 | #endif |
760 | return 0; | |
761 | ||
5873c083 DH |
762 | error_sysctls: |
763 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
764 | error_key_type_s: |
765 | unregister_key_type(&key_type_rxrpc); | |
766 | error_key_type: | |
767 | sock_unregister(PF_RXRPC); | |
768 | error_sock: | |
769 | proto_unregister(&rxrpc_proto); | |
770 | error_proto: | |
648af7fc | 771 | rxrpc_exit_security(); |
8addc044 WY |
772 | error_security: |
773 | destroy_workqueue(rxrpc_workqueue); | |
651350d1 | 774 | error_work_queue: |
17926a79 DH |
775 | kmem_cache_destroy(rxrpc_call_jar); |
776 | error_call_jar: | |
777 | return ret; | |
778 | } | |
779 | ||
780 | /* | |
781 | * unregister the RxRPC protocol | |
782 | */ | |
783 | static void __exit af_rxrpc_exit(void) | |
784 | { | |
785 | _enter(""); | |
5873c083 | 786 | rxrpc_sysctl_exit(); |
17926a79 DH |
787 | unregister_key_type(&key_type_rxrpc_s); |
788 | unregister_key_type(&key_type_rxrpc); | |
789 | sock_unregister(PF_RXRPC); | |
790 | proto_unregister(&rxrpc_proto); | |
791 | rxrpc_destroy_all_calls(); | |
792 | rxrpc_destroy_all_connections(); | |
17926a79 | 793 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); |
4f95dd78 DH |
794 | rxrpc_destroy_all_locals(); |
795 | ||
ece31ffd G |
796 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
797 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 798 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 799 | rxrpc_exit_security(); |
17926a79 DH |
800 | kmem_cache_destroy(rxrpc_call_jar); |
801 | _leave(""); | |
802 | } | |
803 | ||
804 | module_init(af_rxrpc_init); | |
805 | module_exit(af_rxrpc_exit); |