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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 | ||
651350d1 DH |
227 | /** |
228 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
229 | * @sock: The socket on which to make the call | |
2341e077 | 230 | * @srx: The address of the peer to contact |
651350d1 DH |
231 | * @key: The security context to use (defaults to socket setting) |
232 | * @user_call_ID: The ID to use | |
233 | * | |
234 | * Allow a kernel service to begin a call on the nominated socket. This just | |
235 | * sets up all the internal tracking structures and allocates connection and | |
236 | * call IDs as appropriate. The call to be used is returned. | |
237 | * | |
238 | * The default socket destination address and security may be overridden by | |
239 | * supplying @srx and @key. | |
240 | */ | |
241 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
242 | struct sockaddr_rxrpc *srx, | |
243 | struct key *key, | |
244 | unsigned long user_call_ID, | |
245 | gfp_t gfp) | |
246 | { | |
19ffa01c | 247 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
248 | struct rxrpc_call *call; |
249 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 250 | int ret; |
651350d1 DH |
251 | |
252 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
253 | ||
f4552c2d DH |
254 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
255 | if (ret < 0) | |
256 | return ERR_PTR(ret); | |
257 | ||
651350d1 DH |
258 | lock_sock(&rx->sk); |
259 | ||
19ffa01c DH |
260 | if (!key) |
261 | key = rx->key; | |
262 | if (key && !key->payload.data[0]) | |
263 | key = NULL; /* a no-security key */ | |
264 | ||
265 | memset(&cp, 0, sizeof(cp)); | |
266 | cp.local = rx->local; | |
267 | cp.key = key; | |
268 | cp.security_level = 0; | |
269 | cp.exclusive = false; | |
270 | cp.service_id = srx->srx_service; | |
aa390bbe | 271 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp); |
19ffa01c | 272 | |
651350d1 DH |
273 | release_sock(&rx->sk); |
274 | _leave(" = %p", call); | |
275 | return call; | |
276 | } | |
651350d1 DH |
277 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
278 | ||
279 | /** | |
280 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
281 | * @call: The call to end | |
282 | * | |
283 | * Allow a kernel service to end a call it was using. The call must be | |
284 | * complete before this is called (the call should be aborted if necessary). | |
285 | */ | |
286 | void rxrpc_kernel_end_call(struct rxrpc_call *call) | |
287 | { | |
288 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
289 | rxrpc_remove_user_ID(call->socket, call); | |
290 | rxrpc_put_call(call); | |
291 | } | |
651350d1 DH |
292 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
293 | ||
294 | /** | |
295 | * rxrpc_kernel_intercept_rx_messages - Intercept received RxRPC messages | |
296 | * @sock: The socket to intercept received messages on | |
297 | * @interceptor: The function to pass the messages to | |
298 | * | |
299 | * Allow a kernel service to intercept messages heading for the Rx queue on an | |
300 | * RxRPC socket. They get passed to the specified function instead. | |
301 | * @interceptor should free the socket buffers it is given. @interceptor is | |
302 | * called with the socket receive queue spinlock held and softirqs disabled - | |
303 | * this ensures that the messages will be delivered in the right order. | |
304 | */ | |
305 | void rxrpc_kernel_intercept_rx_messages(struct socket *sock, | |
306 | rxrpc_interceptor_t interceptor) | |
307 | { | |
308 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
309 | ||
310 | _enter(""); | |
311 | rx->interceptor = interceptor; | |
312 | } | |
313 | ||
314 | EXPORT_SYMBOL(rxrpc_kernel_intercept_rx_messages); | |
315 | ||
17926a79 DH |
316 | /* |
317 | * connect an RxRPC socket | |
318 | * - this just targets it at a specific destination; no actual connection | |
319 | * negotiation takes place | |
320 | */ | |
321 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
322 | int addr_len, int flags) | |
323 | { | |
2341e077 DH |
324 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
325 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
326 | int ret; |
327 | ||
328 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
329 | ||
330 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
331 | if (ret < 0) { | |
332 | _leave(" = %d [bad addr]", ret); | |
333 | return ret; | |
334 | } | |
335 | ||
336 | lock_sock(&rx->sk); | |
337 | ||
2341e077 DH |
338 | ret = -EISCONN; |
339 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
340 | goto error; | |
341 | ||
17926a79 | 342 | switch (rx->sk.sk_state) { |
2341e077 DH |
343 | case RXRPC_UNBOUND: |
344 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
345 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
346 | case RXRPC_CLIENT_BOUND: |
347 | break; | |
17926a79 | 348 | default: |
2341e077 DH |
349 | ret = -EBUSY; |
350 | goto error; | |
17926a79 DH |
351 | } |
352 | ||
2341e077 DH |
353 | rx->connect_srx = *srx; |
354 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
355 | ret = 0; | |
17926a79 | 356 | |
2341e077 | 357 | error: |
17926a79 | 358 | release_sock(&rx->sk); |
2341e077 | 359 | return ret; |
17926a79 DH |
360 | } |
361 | ||
362 | /* | |
363 | * send a message through an RxRPC socket | |
364 | * - in a client this does a number of things: | |
365 | * - finds/sets up a connection for the security specified (if any) | |
366 | * - initiates a call (ID in control data) | |
367 | * - ends the request phase of a call (if MSG_MORE is not set) | |
368 | * - sends a call data packet | |
369 | * - may send an abort (abort code in control data) | |
370 | */ | |
1b784140 | 371 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 372 | { |
2341e077 | 373 | struct rxrpc_local *local; |
17926a79 DH |
374 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
375 | int ret; | |
376 | ||
377 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
378 | ||
379 | if (m->msg_flags & MSG_OOB) | |
380 | return -EOPNOTSUPP; | |
381 | ||
382 | if (m->msg_name) { | |
383 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
384 | if (ret < 0) { | |
385 | _leave(" = %d [bad addr]", ret); | |
386 | return ret; | |
387 | } | |
388 | } | |
389 | ||
17926a79 DH |
390 | lock_sock(&rx->sk); |
391 | ||
17926a79 | 392 | switch (rx->sk.sk_state) { |
2341e077 DH |
393 | case RXRPC_UNBOUND: |
394 | local = rxrpc_lookup_local(&rx->srx); | |
395 | if (IS_ERR(local)) { | |
396 | ret = PTR_ERR(local); | |
397 | goto error_unlock; | |
17926a79 | 398 | } |
2341e077 DH |
399 | |
400 | rx->local = local; | |
401 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
402 | /* Fall through */ | |
403 | ||
404 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 405 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
406 | if (!m->msg_name && |
407 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
408 | m->msg_name = &rx->connect_srx; | |
409 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 410 | } |
2341e077 DH |
411 | case RXRPC_SERVER_BOUND: |
412 | case RXRPC_SERVER_LISTENING: | |
413 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
414 | break; |
415 | default: | |
2341e077 | 416 | ret = -EINVAL; |
17926a79 DH |
417 | break; |
418 | } | |
419 | ||
2341e077 | 420 | error_unlock: |
17926a79 | 421 | release_sock(&rx->sk); |
17926a79 DH |
422 | _leave(" = %d", ret); |
423 | return ret; | |
424 | } | |
425 | ||
426 | /* | |
427 | * set RxRPC socket options | |
428 | */ | |
429 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 430 | char __user *optval, unsigned int optlen) |
17926a79 DH |
431 | { |
432 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 433 | unsigned int min_sec_level; |
17926a79 DH |
434 | int ret; |
435 | ||
436 | _enter(",%d,%d,,%d", level, optname, optlen); | |
437 | ||
438 | lock_sock(&rx->sk); | |
439 | ret = -EOPNOTSUPP; | |
440 | ||
441 | if (level == SOL_RXRPC) { | |
442 | switch (optname) { | |
443 | case RXRPC_EXCLUSIVE_CONNECTION: | |
444 | ret = -EINVAL; | |
445 | if (optlen != 0) | |
446 | goto error; | |
447 | ret = -EISCONN; | |
2341e077 | 448 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 449 | goto error; |
cc8feb8e | 450 | rx->exclusive = true; |
17926a79 DH |
451 | goto success; |
452 | ||
453 | case RXRPC_SECURITY_KEY: | |
454 | ret = -EINVAL; | |
455 | if (rx->key) | |
456 | goto error; | |
457 | ret = -EISCONN; | |
2341e077 | 458 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
459 | goto error; |
460 | ret = rxrpc_request_key(rx, optval, optlen); | |
461 | goto error; | |
462 | ||
463 | case RXRPC_SECURITY_KEYRING: | |
464 | ret = -EINVAL; | |
465 | if (rx->key) | |
466 | goto error; | |
467 | ret = -EISCONN; | |
2341e077 | 468 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
469 | goto error; |
470 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
471 | goto error; | |
472 | ||
473 | case RXRPC_MIN_SECURITY_LEVEL: | |
474 | ret = -EINVAL; | |
95c96174 | 475 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
476 | goto error; |
477 | ret = -EISCONN; | |
2341e077 | 478 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
479 | goto error; |
480 | ret = get_user(min_sec_level, | |
95c96174 | 481 | (unsigned int __user *) optval); |
17926a79 DH |
482 | if (ret < 0) |
483 | goto error; | |
484 | ret = -EINVAL; | |
485 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
486 | goto error; | |
487 | rx->min_sec_level = min_sec_level; | |
488 | goto success; | |
489 | ||
490 | default: | |
491 | break; | |
492 | } | |
493 | } | |
494 | ||
495 | success: | |
496 | ret = 0; | |
497 | error: | |
498 | release_sock(&rx->sk); | |
499 | return ret; | |
500 | } | |
501 | ||
502 | /* | |
503 | * permit an RxRPC socket to be polled | |
504 | */ | |
505 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
506 | poll_table *wait) | |
507 | { | |
508 | unsigned int mask; | |
509 | struct sock *sk = sock->sk; | |
510 | ||
aa395145 | 511 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
512 | mask = 0; |
513 | ||
514 | /* the socket is readable if there are any messages waiting on the Rx | |
515 | * queue */ | |
516 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
517 | mask |= POLLIN | POLLRDNORM; | |
518 | ||
519 | /* the socket is writable if there is space to add new data to the | |
520 | * socket; there is no guarantee that any particular call in progress | |
521 | * on the socket may have space in the Tx ACK window */ | |
522 | if (rxrpc_writable(sk)) | |
523 | mask |= POLLOUT | POLLWRNORM; | |
524 | ||
525 | return mask; | |
526 | } | |
527 | ||
528 | /* | |
529 | * create an RxRPC socket | |
530 | */ | |
3f378b68 EP |
531 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
532 | int kern) | |
17926a79 DH |
533 | { |
534 | struct rxrpc_sock *rx; | |
535 | struct sock *sk; | |
536 | ||
537 | _enter("%p,%d", sock, protocol); | |
538 | ||
09ad9bc7 | 539 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
540 | return -EAFNOSUPPORT; |
541 | ||
b4f1342f | 542 | /* we support transport protocol UDP/UDP6 only */ |
17926a79 DH |
543 | if (protocol != PF_INET) |
544 | return -EPROTONOSUPPORT; | |
545 | ||
546 | if (sock->type != SOCK_DGRAM) | |
547 | return -ESOCKTNOSUPPORT; | |
548 | ||
549 | sock->ops = &rxrpc_rpc_ops; | |
550 | sock->state = SS_UNCONNECTED; | |
551 | ||
11aa9c28 | 552 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
553 | if (!sk) |
554 | return -ENOMEM; | |
555 | ||
556 | sock_init_data(sock, sk); | |
2341e077 | 557 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 558 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 559 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
560 | sk->sk_destruct = rxrpc_sock_destructor; |
561 | ||
562 | rx = rxrpc_sk(sk); | |
19ffa01c | 563 | rx->family = protocol; |
17926a79 DH |
564 | rx->calls = RB_ROOT; |
565 | ||
566 | INIT_LIST_HEAD(&rx->listen_link); | |
567 | INIT_LIST_HEAD(&rx->secureq); | |
568 | INIT_LIST_HEAD(&rx->acceptq); | |
569 | rwlock_init(&rx->call_lock); | |
570 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
571 | ||
572 | _leave(" = 0 [%p]", rx); | |
573 | return 0; | |
574 | } | |
575 | ||
576 | /* | |
577 | * RxRPC socket destructor | |
578 | */ | |
579 | static void rxrpc_sock_destructor(struct sock *sk) | |
580 | { | |
581 | _enter("%p", sk); | |
582 | ||
583 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
584 | ||
547b792c IJ |
585 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
586 | WARN_ON(!sk_unhashed(sk)); | |
587 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
588 | |
589 | if (!sock_flag(sk, SOCK_DEAD)) { | |
590 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
591 | return; | |
592 | } | |
593 | } | |
594 | ||
595 | /* | |
596 | * release an RxRPC socket | |
597 | */ | |
598 | static int rxrpc_release_sock(struct sock *sk) | |
599 | { | |
600 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
601 | ||
602 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
603 | ||
604 | /* declare the socket closed for business */ | |
605 | sock_orphan(sk); | |
606 | sk->sk_shutdown = SHUTDOWN_MASK; | |
607 | ||
608 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
609 | sk->sk_state = RXRPC_CLOSE; | |
610 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
611 | ||
612 | ASSERTCMP(rx->listen_link.next, !=, LIST_POISON1); | |
613 | ||
614 | if (!list_empty(&rx->listen_link)) { | |
615 | write_lock_bh(&rx->local->services_lock); | |
616 | list_del(&rx->listen_link); | |
617 | write_unlock_bh(&rx->local->services_lock); | |
618 | } | |
619 | ||
620 | /* try to flush out this socket */ | |
621 | rxrpc_release_calls_on_socket(rx); | |
651350d1 | 622 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
623 | rxrpc_purge_queue(&sk->sk_receive_queue); |
624 | ||
5627cc8b DH |
625 | rxrpc_put_local(rx->local); |
626 | rx->local = NULL; | |
17926a79 DH |
627 | key_put(rx->key); |
628 | rx->key = NULL; | |
629 | key_put(rx->securities); | |
630 | rx->securities = NULL; | |
631 | sock_put(sk); | |
632 | ||
633 | _leave(" = 0"); | |
634 | return 0; | |
635 | } | |
636 | ||
637 | /* | |
638 | * release an RxRPC BSD socket on close() or equivalent | |
639 | */ | |
640 | static int rxrpc_release(struct socket *sock) | |
641 | { | |
642 | struct sock *sk = sock->sk; | |
643 | ||
644 | _enter("%p{%p}", sock, sk); | |
645 | ||
646 | if (!sk) | |
647 | return 0; | |
648 | ||
649 | sock->sk = NULL; | |
650 | ||
651 | return rxrpc_release_sock(sk); | |
652 | } | |
653 | ||
654 | /* | |
655 | * RxRPC network protocol | |
656 | */ | |
657 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 658 | .family = PF_RXRPC, |
17926a79 DH |
659 | .owner = THIS_MODULE, |
660 | .release = rxrpc_release, | |
661 | .bind = rxrpc_bind, | |
662 | .connect = rxrpc_connect, | |
663 | .socketpair = sock_no_socketpair, | |
664 | .accept = sock_no_accept, | |
665 | .getname = sock_no_getname, | |
666 | .poll = rxrpc_poll, | |
667 | .ioctl = sock_no_ioctl, | |
668 | .listen = rxrpc_listen, | |
669 | .shutdown = sock_no_shutdown, | |
670 | .setsockopt = rxrpc_setsockopt, | |
671 | .getsockopt = sock_no_getsockopt, | |
672 | .sendmsg = rxrpc_sendmsg, | |
673 | .recvmsg = rxrpc_recvmsg, | |
674 | .mmap = sock_no_mmap, | |
675 | .sendpage = sock_no_sendpage, | |
676 | }; | |
677 | ||
678 | static struct proto rxrpc_proto = { | |
679 | .name = "RXRPC", | |
680 | .owner = THIS_MODULE, | |
681 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 682 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
683 | }; |
684 | ||
ec1b4cf7 | 685 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
686 | .family = PF_RXRPC, |
687 | .create = rxrpc_create, | |
688 | .owner = THIS_MODULE, | |
689 | }; | |
690 | ||
691 | /* | |
692 | * initialise and register the RxRPC protocol | |
693 | */ | |
694 | static int __init af_rxrpc_init(void) | |
695 | { | |
17926a79 DH |
696 | int ret = -1; |
697 | ||
ce6654cf | 698 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 699 | |
0d12f8a4 | 700 | rxrpc_epoch = get_seconds(); |
17926a79 | 701 | |
651350d1 | 702 | ret = -ENOMEM; |
17926a79 DH |
703 | rxrpc_call_jar = kmem_cache_create( |
704 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 705 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 706 | if (!rxrpc_call_jar) { |
9b6d5398 | 707 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
708 | goto error_call_jar; |
709 | } | |
710 | ||
e1fcc7e2 | 711 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 712 | if (!rxrpc_workqueue) { |
9b6d5398 | 713 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
714 | goto error_work_queue; |
715 | } | |
716 | ||
648af7fc DH |
717 | ret = rxrpc_init_security(); |
718 | if (ret < 0) { | |
9b6d5398 | 719 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
720 | goto error_security; |
721 | } | |
722 | ||
17926a79 | 723 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 724 | if (ret < 0) { |
9b6d5398 | 725 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
726 | goto error_proto; |
727 | } | |
728 | ||
729 | ret = sock_register(&rxrpc_family_ops); | |
730 | if (ret < 0) { | |
9b6d5398 | 731 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
732 | goto error_sock; |
733 | } | |
734 | ||
735 | ret = register_key_type(&key_type_rxrpc); | |
736 | if (ret < 0) { | |
9b6d5398 | 737 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
738 | goto error_key_type; |
739 | } | |
740 | ||
741 | ret = register_key_type(&key_type_rxrpc_s); | |
742 | if (ret < 0) { | |
9b6d5398 | 743 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
744 | goto error_key_type_s; |
745 | } | |
746 | ||
5873c083 DH |
747 | ret = rxrpc_sysctl_init(); |
748 | if (ret < 0) { | |
9b6d5398 | 749 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
750 | goto error_sysctls; |
751 | } | |
752 | ||
17926a79 | 753 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
754 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
755 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
756 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
757 | #endif |
758 | return 0; | |
759 | ||
5873c083 DH |
760 | error_sysctls: |
761 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
762 | error_key_type_s: |
763 | unregister_key_type(&key_type_rxrpc); | |
764 | error_key_type: | |
765 | sock_unregister(PF_RXRPC); | |
766 | error_sock: | |
767 | proto_unregister(&rxrpc_proto); | |
768 | error_proto: | |
648af7fc | 769 | rxrpc_exit_security(); |
8addc044 WY |
770 | error_security: |
771 | destroy_workqueue(rxrpc_workqueue); | |
651350d1 | 772 | error_work_queue: |
17926a79 DH |
773 | kmem_cache_destroy(rxrpc_call_jar); |
774 | error_call_jar: | |
775 | return ret; | |
776 | } | |
777 | ||
778 | /* | |
779 | * unregister the RxRPC protocol | |
780 | */ | |
781 | static void __exit af_rxrpc_exit(void) | |
782 | { | |
783 | _enter(""); | |
5873c083 | 784 | rxrpc_sysctl_exit(); |
17926a79 DH |
785 | unregister_key_type(&key_type_rxrpc_s); |
786 | unregister_key_type(&key_type_rxrpc); | |
787 | sock_unregister(PF_RXRPC); | |
788 | proto_unregister(&rxrpc_proto); | |
789 | rxrpc_destroy_all_calls(); | |
790 | rxrpc_destroy_all_connections(); | |
17926a79 | 791 | ASSERTCMP(atomic_read(&rxrpc_n_skbs), ==, 0); |
4f95dd78 DH |
792 | rxrpc_destroy_all_locals(); |
793 | ||
ece31ffd G |
794 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
795 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 796 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 797 | rxrpc_exit_security(); |
17926a79 DH |
798 | kmem_cache_destroy(rxrpc_call_jar); |
799 | _leave(""); | |
800 | } | |
801 | ||
802 | module_init(af_rxrpc_init); | |
803 | module_exit(af_rxrpc_exit); |