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