Commit | Line | Data |
---|---|---|
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 | 18 | #include <linux/skbuff.h> |
5f2d9c44 | 19 | #include <linux/random.h> |
17926a79 DH |
20 | #include <linux/poll.h> |
21 | #include <linux/proc_fs.h> | |
76181c13 | 22 | #include <linux/key-type.h> |
457c4cbc | 23 | #include <net/net_namespace.h> |
17926a79 DH |
24 | #include <net/sock.h> |
25 | #include <net/af_rxrpc.h> | |
df844fd4 | 26 | #define CREATE_TRACE_POINTS |
17926a79 DH |
27 | #include "ar-internal.h" |
28 | ||
29 | MODULE_DESCRIPTION("RxRPC network protocol"); | |
30 | MODULE_AUTHOR("Red Hat, Inc."); | |
31 | MODULE_LICENSE("GPL"); | |
32 | MODULE_ALIAS_NETPROTO(PF_RXRPC); | |
33 | ||
95c96174 | 34 | unsigned int rxrpc_debug; // = RXRPC_DEBUG_KPROTO; |
17926a79 | 35 | module_param_named(debug, rxrpc_debug, uint, S_IWUSR | S_IRUGO); |
424b00e2 | 36 | MODULE_PARM_DESC(debug, "RxRPC debugging mask"); |
17926a79 | 37 | |
17926a79 DH |
38 | static struct proto rxrpc_proto; |
39 | static const struct proto_ops rxrpc_rpc_ops; | |
40 | ||
41 | /* local epoch for detecting local-end reset */ | |
0d12f8a4 | 42 | u32 rxrpc_epoch; |
17926a79 DH |
43 | |
44 | /* current debugging ID */ | |
45 | atomic_t rxrpc_debug_id; | |
46 | ||
47 | /* count of skbs currently in use */ | |
71f3ca40 | 48 | atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs; |
17926a79 | 49 | |
651350d1 DH |
50 | struct workqueue_struct *rxrpc_workqueue; |
51 | ||
17926a79 DH |
52 | static void rxrpc_sock_destructor(struct sock *); |
53 | ||
54 | /* | |
55 | * see if an RxRPC socket is currently writable | |
56 | */ | |
57 | static inline int rxrpc_writable(struct sock *sk) | |
58 | { | |
59 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
60 | } | |
61 | ||
62 | /* | |
63 | * wait for write bufferage to become available | |
64 | */ | |
65 | static void rxrpc_write_space(struct sock *sk) | |
66 | { | |
67 | _enter("%p", sk); | |
43815482 | 68 | rcu_read_lock(); |
17926a79 | 69 | if (rxrpc_writable(sk)) { |
43815482 ED |
70 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
71 | ||
1ce0bf50 | 72 | if (skwq_has_sleeper(wq)) |
43815482 | 73 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 74 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 75 | } |
43815482 | 76 | rcu_read_unlock(); |
17926a79 DH |
77 | } |
78 | ||
79 | /* | |
80 | * validate an RxRPC address | |
81 | */ | |
82 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
83 | struct sockaddr_rxrpc *srx, | |
84 | int len) | |
85 | { | |
dad8aff7 | 86 | unsigned int tail; |
ab802ee0 | 87 | |
17926a79 DH |
88 | if (len < sizeof(struct sockaddr_rxrpc)) |
89 | return -EINVAL; | |
90 | ||
91 | if (srx->srx_family != AF_RXRPC) | |
92 | return -EAFNOSUPPORT; | |
93 | ||
94 | if (srx->transport_type != SOCK_DGRAM) | |
95 | return -ESOCKTNOSUPPORT; | |
96 | ||
97 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
98 | if (srx->transport_len < sizeof(sa_family_t) || | |
99 | srx->transport_len > len) | |
100 | return -EINVAL; | |
101 | ||
19ffa01c | 102 | if (srx->transport.family != rx->family) |
17926a79 DH |
103 | return -EAFNOSUPPORT; |
104 | ||
105 | switch (srx->transport.family) { | |
106 | case AF_INET: | |
4f95dd78 DH |
107 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
108 | return -EINVAL; | |
ab802ee0 | 109 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
110 | break; |
111 | ||
d1912747 | 112 | #ifdef CONFIG_AF_RXRPC_IPV6 |
17926a79 | 113 | case AF_INET6: |
75b54cb5 DH |
114 | if (srx->transport_len < sizeof(struct sockaddr_in6)) |
115 | return -EINVAL; | |
116 | tail = offsetof(struct sockaddr_rxrpc, transport) + | |
117 | sizeof(struct sockaddr_in6); | |
118 | break; | |
d1912747 | 119 | #endif |
75b54cb5 | 120 | |
17926a79 DH |
121 | default: |
122 | return -EAFNOSUPPORT; | |
123 | } | |
124 | ||
ab802ee0 DH |
125 | if (tail < len) |
126 | memset((void *)srx + tail, 0, len - tail); | |
75b54cb5 | 127 | _debug("INET: %pISp", &srx->transport); |
17926a79 DH |
128 | return 0; |
129 | } | |
130 | ||
131 | /* | |
132 | * bind a local address to an RxRPC socket | |
133 | */ | |
134 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
135 | { | |
b4f1342f | 136 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 DH |
137 | struct sock *sk = sock->sk; |
138 | struct rxrpc_local *local; | |
1e9e5c95 DH |
139 | struct rxrpc_sock *rx = rxrpc_sk(sk); |
140 | u16 service_id = srx->srx_service; | |
17926a79 DH |
141 | int ret; |
142 | ||
143 | _enter("%p,%p,%d", rx, saddr, len); | |
144 | ||
145 | ret = rxrpc_validate_address(rx, srx, len); | |
146 | if (ret < 0) | |
147 | goto error; | |
148 | ||
149 | lock_sock(&rx->sk); | |
150 | ||
2341e077 | 151 | if (rx->sk.sk_state != RXRPC_UNBOUND) { |
17926a79 DH |
152 | ret = -EINVAL; |
153 | goto error_unlock; | |
154 | } | |
155 | ||
156 | memcpy(&rx->srx, srx, sizeof(rx->srx)); | |
157 | ||
17926a79 DH |
158 | local = rxrpc_lookup_local(&rx->srx); |
159 | if (IS_ERR(local)) { | |
160 | ret = PTR_ERR(local); | |
161 | goto error_unlock; | |
162 | } | |
163 | ||
1e9e5c95 | 164 | if (service_id) { |
248f219c | 165 | write_lock(&local->services_lock); |
1e9e5c95 DH |
166 | if (rcu_access_pointer(local->service)) |
167 | goto service_in_use; | |
2341e077 | 168 | rx->local = local; |
1e9e5c95 | 169 | rcu_assign_pointer(local->service, rx); |
248f219c | 170 | write_unlock(&local->services_lock); |
17926a79 DH |
171 | |
172 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
173 | } else { | |
2341e077 | 174 | rx->local = local; |
17926a79 DH |
175 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; |
176 | } | |
177 | ||
178 | release_sock(&rx->sk); | |
179 | _leave(" = 0"); | |
180 | return 0; | |
181 | ||
182 | service_in_use: | |
248f219c | 183 | write_unlock(&local->services_lock); |
2341e077 DH |
184 | rxrpc_put_local(local); |
185 | ret = -EADDRINUSE; | |
17926a79 DH |
186 | error_unlock: |
187 | release_sock(&rx->sk); | |
188 | error: | |
189 | _leave(" = %d", ret); | |
190 | return ret; | |
191 | } | |
192 | ||
193 | /* | |
194 | * set the number of pending calls permitted on a listening socket | |
195 | */ | |
196 | static int rxrpc_listen(struct socket *sock, int backlog) | |
197 | { | |
198 | struct sock *sk = sock->sk; | |
199 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
00e90712 | 200 | unsigned int max, old; |
17926a79 DH |
201 | int ret; |
202 | ||
203 | _enter("%p,%d", rx, backlog); | |
204 | ||
205 | lock_sock(&rx->sk); | |
206 | ||
207 | switch (rx->sk.sk_state) { | |
2341e077 | 208 | case RXRPC_UNBOUND: |
17926a79 DH |
209 | ret = -EADDRNOTAVAIL; |
210 | break; | |
17926a79 DH |
211 | case RXRPC_SERVER_BOUND: |
212 | ASSERT(rx->local != NULL); | |
0e119b41 DH |
213 | max = READ_ONCE(rxrpc_max_backlog); |
214 | ret = -EINVAL; | |
215 | if (backlog == INT_MAX) | |
216 | backlog = max; | |
217 | else if (backlog < 0 || backlog > max) | |
218 | break; | |
00e90712 | 219 | old = sk->sk_max_ack_backlog; |
17926a79 | 220 | sk->sk_max_ack_backlog = backlog; |
00e90712 DH |
221 | ret = rxrpc_service_prealloc(rx, GFP_KERNEL); |
222 | if (ret == 0) | |
223 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
224 | else | |
225 | sk->sk_max_ack_backlog = old; | |
17926a79 | 226 | break; |
0e119b41 DH |
227 | default: |
228 | ret = -EBUSY; | |
229 | break; | |
17926a79 DH |
230 | } |
231 | ||
232 | release_sock(&rx->sk); | |
233 | _leave(" = %d", ret); | |
234 | return ret; | |
235 | } | |
236 | ||
651350d1 DH |
237 | /** |
238 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
239 | * @sock: The socket on which to make the call | |
2341e077 | 240 | * @srx: The address of the peer to contact |
651350d1 DH |
241 | * @key: The security context to use (defaults to socket setting) |
242 | * @user_call_ID: The ID to use | |
d001648e DH |
243 | * @gfp: The allocation constraints |
244 | * @notify_rx: Where to send notifications instead of socket queue | |
651350d1 DH |
245 | * |
246 | * Allow a kernel service to begin a call on the nominated socket. This just | |
247 | * sets up all the internal tracking structures and allocates connection and | |
248 | * call IDs as appropriate. The call to be used is returned. | |
249 | * | |
250 | * The default socket destination address and security may be overridden by | |
251 | * supplying @srx and @key. | |
252 | */ | |
253 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
254 | struct sockaddr_rxrpc *srx, | |
255 | struct key *key, | |
256 | unsigned long user_call_ID, | |
d001648e DH |
257 | gfp_t gfp, |
258 | rxrpc_notify_rx_t notify_rx) | |
651350d1 | 259 | { |
19ffa01c | 260 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
261 | struct rxrpc_call *call; |
262 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 263 | int ret; |
651350d1 DH |
264 | |
265 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
266 | ||
f4552c2d DH |
267 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
268 | if (ret < 0) | |
269 | return ERR_PTR(ret); | |
270 | ||
651350d1 DH |
271 | lock_sock(&rx->sk); |
272 | ||
19ffa01c DH |
273 | if (!key) |
274 | key = rx->key; | |
275 | if (key && !key->payload.data[0]) | |
276 | key = NULL; /* a no-security key */ | |
277 | ||
278 | memset(&cp, 0, sizeof(cp)); | |
279 | cp.local = rx->local; | |
280 | cp.key = key; | |
281 | cp.security_level = 0; | |
282 | cp.exclusive = false; | |
283 | cp.service_id = srx->srx_service; | |
aa390bbe | 284 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp); |
d001648e DH |
285 | if (!IS_ERR(call)) |
286 | call->notify_rx = notify_rx; | |
19ffa01c | 287 | |
651350d1 DH |
288 | release_sock(&rx->sk); |
289 | _leave(" = %p", call); | |
290 | return call; | |
291 | } | |
651350d1 DH |
292 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
293 | ||
294 | /** | |
295 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
4de48af6 | 296 | * @sock: The socket the call is on |
651350d1 DH |
297 | * @call: The call to end |
298 | * | |
299 | * Allow a kernel service to end a call it was using. The call must be | |
300 | * complete before this is called (the call should be aborted if necessary). | |
301 | */ | |
4de48af6 | 302 | void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call) |
651350d1 DH |
303 | { |
304 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
8d94aa38 | 305 | rxrpc_release_call(rxrpc_sk(sock->sk), call); |
cbd00891 | 306 | rxrpc_put_call(call, rxrpc_call_put_kernel); |
651350d1 | 307 | } |
651350d1 DH |
308 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
309 | ||
310 | /** | |
d001648e | 311 | * rxrpc_kernel_new_call_notification - Get notifications of new calls |
651350d1 | 312 | * @sock: The socket to intercept received messages on |
d001648e | 313 | * @notify_new_call: Function to be called when new calls appear |
00e90712 | 314 | * @discard_new_call: Function to discard preallocated calls |
651350d1 | 315 | * |
d001648e | 316 | * Allow a kernel service to be given notifications about new calls. |
651350d1 | 317 | */ |
d001648e DH |
318 | void rxrpc_kernel_new_call_notification( |
319 | struct socket *sock, | |
00e90712 DH |
320 | rxrpc_notify_new_call_t notify_new_call, |
321 | rxrpc_discard_new_call_t discard_new_call) | |
651350d1 DH |
322 | { |
323 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
324 | ||
d001648e | 325 | rx->notify_new_call = notify_new_call; |
00e90712 | 326 | rx->discard_new_call = discard_new_call; |
651350d1 | 327 | } |
d001648e | 328 | EXPORT_SYMBOL(rxrpc_kernel_new_call_notification); |
651350d1 | 329 | |
17926a79 DH |
330 | /* |
331 | * connect an RxRPC socket | |
332 | * - this just targets it at a specific destination; no actual connection | |
333 | * negotiation takes place | |
334 | */ | |
335 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
336 | int addr_len, int flags) | |
337 | { | |
2341e077 DH |
338 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
339 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
340 | int ret; |
341 | ||
342 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
343 | ||
344 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
345 | if (ret < 0) { | |
346 | _leave(" = %d [bad addr]", ret); | |
347 | return ret; | |
348 | } | |
349 | ||
350 | lock_sock(&rx->sk); | |
351 | ||
2341e077 DH |
352 | ret = -EISCONN; |
353 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
354 | goto error; | |
355 | ||
17926a79 | 356 | switch (rx->sk.sk_state) { |
2341e077 DH |
357 | case RXRPC_UNBOUND: |
358 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
359 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
360 | case RXRPC_CLIENT_BOUND: |
361 | break; | |
17926a79 | 362 | default: |
2341e077 DH |
363 | ret = -EBUSY; |
364 | goto error; | |
17926a79 DH |
365 | } |
366 | ||
2341e077 DH |
367 | rx->connect_srx = *srx; |
368 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
369 | ret = 0; | |
17926a79 | 370 | |
2341e077 | 371 | error: |
17926a79 | 372 | release_sock(&rx->sk); |
2341e077 | 373 | return ret; |
17926a79 DH |
374 | } |
375 | ||
376 | /* | |
377 | * send a message through an RxRPC socket | |
378 | * - in a client this does a number of things: | |
379 | * - finds/sets up a connection for the security specified (if any) | |
380 | * - initiates a call (ID in control data) | |
381 | * - ends the request phase of a call (if MSG_MORE is not set) | |
382 | * - sends a call data packet | |
383 | * - may send an abort (abort code in control data) | |
384 | */ | |
1b784140 | 385 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 386 | { |
2341e077 | 387 | struct rxrpc_local *local; |
17926a79 DH |
388 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
389 | int ret; | |
390 | ||
391 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
392 | ||
393 | if (m->msg_flags & MSG_OOB) | |
394 | return -EOPNOTSUPP; | |
395 | ||
396 | if (m->msg_name) { | |
397 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
398 | if (ret < 0) { | |
399 | _leave(" = %d [bad addr]", ret); | |
400 | return ret; | |
401 | } | |
402 | } | |
403 | ||
17926a79 DH |
404 | lock_sock(&rx->sk); |
405 | ||
17926a79 | 406 | switch (rx->sk.sk_state) { |
2341e077 | 407 | case RXRPC_UNBOUND: |
cd5892c7 DH |
408 | rx->srx.srx_family = AF_RXRPC; |
409 | rx->srx.srx_service = 0; | |
410 | rx->srx.transport_type = SOCK_DGRAM; | |
411 | rx->srx.transport.family = rx->family; | |
412 | switch (rx->family) { | |
413 | case AF_INET: | |
414 | rx->srx.transport_len = sizeof(struct sockaddr_in); | |
415 | break; | |
d1912747 | 416 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
417 | case AF_INET6: |
418 | rx->srx.transport_len = sizeof(struct sockaddr_in6); | |
419 | break; | |
d1912747 | 420 | #endif |
cd5892c7 DH |
421 | default: |
422 | ret = -EAFNOSUPPORT; | |
423 | goto error_unlock; | |
424 | } | |
2341e077 DH |
425 | local = rxrpc_lookup_local(&rx->srx); |
426 | if (IS_ERR(local)) { | |
427 | ret = PTR_ERR(local); | |
428 | goto error_unlock; | |
17926a79 | 429 | } |
2341e077 DH |
430 | |
431 | rx->local = local; | |
432 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
433 | /* Fall through */ | |
434 | ||
435 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 436 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
437 | if (!m->msg_name && |
438 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
439 | m->msg_name = &rx->connect_srx; | |
440 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 441 | } |
2341e077 DH |
442 | case RXRPC_SERVER_BOUND: |
443 | case RXRPC_SERVER_LISTENING: | |
444 | ret = rxrpc_do_sendmsg(rx, m, len); | |
17926a79 DH |
445 | break; |
446 | default: | |
2341e077 | 447 | ret = -EINVAL; |
17926a79 DH |
448 | break; |
449 | } | |
450 | ||
2341e077 | 451 | error_unlock: |
17926a79 | 452 | release_sock(&rx->sk); |
17926a79 DH |
453 | _leave(" = %d", ret); |
454 | return ret; | |
455 | } | |
456 | ||
457 | /* | |
458 | * set RxRPC socket options | |
459 | */ | |
460 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 461 | char __user *optval, unsigned int optlen) |
17926a79 DH |
462 | { |
463 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 464 | unsigned int min_sec_level; |
17926a79 DH |
465 | int ret; |
466 | ||
467 | _enter(",%d,%d,,%d", level, optname, optlen); | |
468 | ||
469 | lock_sock(&rx->sk); | |
470 | ret = -EOPNOTSUPP; | |
471 | ||
472 | if (level == SOL_RXRPC) { | |
473 | switch (optname) { | |
474 | case RXRPC_EXCLUSIVE_CONNECTION: | |
475 | ret = -EINVAL; | |
476 | if (optlen != 0) | |
477 | goto error; | |
478 | ret = -EISCONN; | |
2341e077 | 479 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 480 | goto error; |
cc8feb8e | 481 | rx->exclusive = true; |
17926a79 DH |
482 | goto success; |
483 | ||
484 | case RXRPC_SECURITY_KEY: | |
485 | ret = -EINVAL; | |
486 | if (rx->key) | |
487 | goto error; | |
488 | ret = -EISCONN; | |
2341e077 | 489 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
490 | goto error; |
491 | ret = rxrpc_request_key(rx, optval, optlen); | |
492 | goto error; | |
493 | ||
494 | case RXRPC_SECURITY_KEYRING: | |
495 | ret = -EINVAL; | |
496 | if (rx->key) | |
497 | goto error; | |
498 | ret = -EISCONN; | |
2341e077 | 499 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
500 | goto error; |
501 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
502 | goto error; | |
503 | ||
504 | case RXRPC_MIN_SECURITY_LEVEL: | |
505 | ret = -EINVAL; | |
95c96174 | 506 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
507 | goto error; |
508 | ret = -EISCONN; | |
2341e077 | 509 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
510 | goto error; |
511 | ret = get_user(min_sec_level, | |
95c96174 | 512 | (unsigned int __user *) optval); |
17926a79 DH |
513 | if (ret < 0) |
514 | goto error; | |
515 | ret = -EINVAL; | |
516 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
517 | goto error; | |
518 | rx->min_sec_level = min_sec_level; | |
519 | goto success; | |
520 | ||
521 | default: | |
522 | break; | |
523 | } | |
524 | } | |
525 | ||
526 | success: | |
527 | ret = 0; | |
528 | error: | |
529 | release_sock(&rx->sk); | |
530 | return ret; | |
531 | } | |
532 | ||
533 | /* | |
534 | * permit an RxRPC socket to be polled | |
535 | */ | |
536 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
537 | poll_table *wait) | |
538 | { | |
17926a79 | 539 | struct sock *sk = sock->sk; |
248f219c DH |
540 | struct rxrpc_sock *rx = rxrpc_sk(sk); |
541 | unsigned int mask; | |
17926a79 | 542 | |
aa395145 | 543 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
544 | mask = 0; |
545 | ||
546 | /* the socket is readable if there are any messages waiting on the Rx | |
547 | * queue */ | |
248f219c | 548 | if (!list_empty(&rx->recvmsg_q)) |
17926a79 DH |
549 | mask |= POLLIN | POLLRDNORM; |
550 | ||
551 | /* the socket is writable if there is space to add new data to the | |
552 | * socket; there is no guarantee that any particular call in progress | |
553 | * on the socket may have space in the Tx ACK window */ | |
554 | if (rxrpc_writable(sk)) | |
555 | mask |= POLLOUT | POLLWRNORM; | |
556 | ||
557 | return mask; | |
558 | } | |
559 | ||
560 | /* | |
561 | * create an RxRPC socket | |
562 | */ | |
3f378b68 EP |
563 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
564 | int kern) | |
17926a79 DH |
565 | { |
566 | struct rxrpc_sock *rx; | |
567 | struct sock *sk; | |
568 | ||
569 | _enter("%p,%d", sock, protocol); | |
570 | ||
09ad9bc7 | 571 | if (!net_eq(net, &init_net)) |
1b8d7ae4 EB |
572 | return -EAFNOSUPPORT; |
573 | ||
b4f1342f | 574 | /* we support transport protocol UDP/UDP6 only */ |
d1912747 DH |
575 | if (protocol != PF_INET && |
576 | IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6) | |
17926a79 DH |
577 | return -EPROTONOSUPPORT; |
578 | ||
579 | if (sock->type != SOCK_DGRAM) | |
580 | return -ESOCKTNOSUPPORT; | |
581 | ||
582 | sock->ops = &rxrpc_rpc_ops; | |
583 | sock->state = SS_UNCONNECTED; | |
584 | ||
11aa9c28 | 585 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
586 | if (!sk) |
587 | return -ENOMEM; | |
588 | ||
589 | sock_init_data(sock, sk); | |
8d94aa38 | 590 | sock_set_flag(sk, SOCK_RCU_FREE); |
2341e077 | 591 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 592 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 593 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
594 | sk->sk_destruct = rxrpc_sock_destructor; |
595 | ||
596 | rx = rxrpc_sk(sk); | |
19ffa01c | 597 | rx->family = protocol; |
17926a79 DH |
598 | rx->calls = RB_ROOT; |
599 | ||
248f219c DH |
600 | spin_lock_init(&rx->incoming_lock); |
601 | INIT_LIST_HEAD(&rx->sock_calls); | |
602 | INIT_LIST_HEAD(&rx->to_be_accepted); | |
603 | INIT_LIST_HEAD(&rx->recvmsg_q); | |
604 | rwlock_init(&rx->recvmsg_lock); | |
17926a79 DH |
605 | rwlock_init(&rx->call_lock); |
606 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
607 | ||
608 | _leave(" = 0 [%p]", rx); | |
609 | return 0; | |
610 | } | |
611 | ||
248f219c DH |
612 | /* |
613 | * Kill all the calls on a socket and shut it down. | |
614 | */ | |
615 | static int rxrpc_shutdown(struct socket *sock, int flags) | |
616 | { | |
617 | struct sock *sk = sock->sk; | |
618 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
619 | int ret = 0; | |
620 | ||
621 | _enter("%p,%d", sk, flags); | |
622 | ||
623 | if (flags != SHUT_RDWR) | |
624 | return -EOPNOTSUPP; | |
625 | if (sk->sk_state == RXRPC_CLOSE) | |
626 | return -ESHUTDOWN; | |
627 | ||
628 | lock_sock(sk); | |
629 | ||
630 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
631 | if (sk->sk_state < RXRPC_CLOSE) { | |
632 | sk->sk_state = RXRPC_CLOSE; | |
633 | sk->sk_shutdown = SHUTDOWN_MASK; | |
634 | } else { | |
635 | ret = -ESHUTDOWN; | |
636 | } | |
637 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
638 | ||
639 | rxrpc_discard_prealloc(rx); | |
640 | ||
641 | release_sock(sk); | |
642 | return ret; | |
643 | } | |
644 | ||
17926a79 DH |
645 | /* |
646 | * RxRPC socket destructor | |
647 | */ | |
648 | static void rxrpc_sock_destructor(struct sock *sk) | |
649 | { | |
650 | _enter("%p", sk); | |
651 | ||
652 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
653 | ||
547b792c IJ |
654 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
655 | WARN_ON(!sk_unhashed(sk)); | |
656 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
657 | |
658 | if (!sock_flag(sk, SOCK_DEAD)) { | |
659 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
660 | return; | |
661 | } | |
662 | } | |
663 | ||
664 | /* | |
665 | * release an RxRPC socket | |
666 | */ | |
667 | static int rxrpc_release_sock(struct sock *sk) | |
668 | { | |
669 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
670 | ||
671 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
672 | ||
673 | /* declare the socket closed for business */ | |
674 | sock_orphan(sk); | |
675 | sk->sk_shutdown = SHUTDOWN_MASK; | |
676 | ||
677 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
678 | sk->sk_state = RXRPC_CLOSE; | |
679 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
680 | ||
1e9e5c95 | 681 | if (rx->local && rx->local->service == rx) { |
248f219c | 682 | write_lock(&rx->local->services_lock); |
1e9e5c95 | 683 | rx->local->service = NULL; |
248f219c | 684 | write_unlock(&rx->local->services_lock); |
17926a79 DH |
685 | } |
686 | ||
687 | /* try to flush out this socket */ | |
00e90712 | 688 | rxrpc_discard_prealloc(rx); |
17926a79 | 689 | rxrpc_release_calls_on_socket(rx); |
651350d1 | 690 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
691 | rxrpc_purge_queue(&sk->sk_receive_queue); |
692 | ||
5627cc8b DH |
693 | rxrpc_put_local(rx->local); |
694 | rx->local = NULL; | |
17926a79 DH |
695 | key_put(rx->key); |
696 | rx->key = NULL; | |
697 | key_put(rx->securities); | |
698 | rx->securities = NULL; | |
699 | sock_put(sk); | |
700 | ||
701 | _leave(" = 0"); | |
702 | return 0; | |
703 | } | |
704 | ||
705 | /* | |
706 | * release an RxRPC BSD socket on close() or equivalent | |
707 | */ | |
708 | static int rxrpc_release(struct socket *sock) | |
709 | { | |
710 | struct sock *sk = sock->sk; | |
711 | ||
712 | _enter("%p{%p}", sock, sk); | |
713 | ||
714 | if (!sk) | |
715 | return 0; | |
716 | ||
717 | sock->sk = NULL; | |
718 | ||
719 | return rxrpc_release_sock(sk); | |
720 | } | |
721 | ||
722 | /* | |
723 | * RxRPC network protocol | |
724 | */ | |
725 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 726 | .family = PF_RXRPC, |
17926a79 DH |
727 | .owner = THIS_MODULE, |
728 | .release = rxrpc_release, | |
729 | .bind = rxrpc_bind, | |
730 | .connect = rxrpc_connect, | |
731 | .socketpair = sock_no_socketpair, | |
732 | .accept = sock_no_accept, | |
733 | .getname = sock_no_getname, | |
734 | .poll = rxrpc_poll, | |
735 | .ioctl = sock_no_ioctl, | |
736 | .listen = rxrpc_listen, | |
248f219c | 737 | .shutdown = rxrpc_shutdown, |
17926a79 DH |
738 | .setsockopt = rxrpc_setsockopt, |
739 | .getsockopt = sock_no_getsockopt, | |
740 | .sendmsg = rxrpc_sendmsg, | |
741 | .recvmsg = rxrpc_recvmsg, | |
742 | .mmap = sock_no_mmap, | |
743 | .sendpage = sock_no_sendpage, | |
744 | }; | |
745 | ||
746 | static struct proto rxrpc_proto = { | |
747 | .name = "RXRPC", | |
748 | .owner = THIS_MODULE, | |
749 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 750 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
751 | }; |
752 | ||
ec1b4cf7 | 753 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
754 | .family = PF_RXRPC, |
755 | .create = rxrpc_create, | |
756 | .owner = THIS_MODULE, | |
757 | }; | |
758 | ||
759 | /* | |
760 | * initialise and register the RxRPC protocol | |
761 | */ | |
762 | static int __init af_rxrpc_init(void) | |
763 | { | |
17926a79 DH |
764 | int ret = -1; |
765 | ||
ce6654cf | 766 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 767 | |
5f2d9c44 DH |
768 | get_random_bytes(&rxrpc_epoch, sizeof(rxrpc_epoch)); |
769 | rxrpc_epoch |= RXRPC_RANDOM_EPOCH; | |
770 | get_random_bytes(&rxrpc_client_conn_ids.cur, | |
771 | sizeof(rxrpc_client_conn_ids.cur)); | |
772 | rxrpc_client_conn_ids.cur &= 0x3fffffff; | |
773 | if (rxrpc_client_conn_ids.cur == 0) | |
774 | rxrpc_client_conn_ids.cur = 1; | |
17926a79 | 775 | |
651350d1 | 776 | ret = -ENOMEM; |
17926a79 DH |
777 | rxrpc_call_jar = kmem_cache_create( |
778 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 779 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 780 | if (!rxrpc_call_jar) { |
9b6d5398 | 781 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
782 | goto error_call_jar; |
783 | } | |
784 | ||
e1fcc7e2 | 785 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 786 | if (!rxrpc_workqueue) { |
9b6d5398 | 787 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
788 | goto error_work_queue; |
789 | } | |
790 | ||
648af7fc DH |
791 | ret = rxrpc_init_security(); |
792 | if (ret < 0) { | |
9b6d5398 | 793 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
794 | goto error_security; |
795 | } | |
796 | ||
17926a79 | 797 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 798 | if (ret < 0) { |
9b6d5398 | 799 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
800 | goto error_proto; |
801 | } | |
802 | ||
803 | ret = sock_register(&rxrpc_family_ops); | |
804 | if (ret < 0) { | |
9b6d5398 | 805 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
806 | goto error_sock; |
807 | } | |
808 | ||
809 | ret = register_key_type(&key_type_rxrpc); | |
810 | if (ret < 0) { | |
9b6d5398 | 811 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
812 | goto error_key_type; |
813 | } | |
814 | ||
815 | ret = register_key_type(&key_type_rxrpc_s); | |
816 | if (ret < 0) { | |
9b6d5398 | 817 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
818 | goto error_key_type_s; |
819 | } | |
820 | ||
5873c083 DH |
821 | ret = rxrpc_sysctl_init(); |
822 | if (ret < 0) { | |
9b6d5398 | 823 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
824 | goto error_sysctls; |
825 | } | |
826 | ||
17926a79 | 827 | #ifdef CONFIG_PROC_FS |
d4beaa66 G |
828 | proc_create("rxrpc_calls", 0, init_net.proc_net, &rxrpc_call_seq_fops); |
829 | proc_create("rxrpc_conns", 0, init_net.proc_net, | |
830 | &rxrpc_connection_seq_fops); | |
17926a79 DH |
831 | #endif |
832 | return 0; | |
833 | ||
5873c083 DH |
834 | error_sysctls: |
835 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
836 | error_key_type_s: |
837 | unregister_key_type(&key_type_rxrpc); | |
838 | error_key_type: | |
839 | sock_unregister(PF_RXRPC); | |
840 | error_sock: | |
841 | proto_unregister(&rxrpc_proto); | |
842 | error_proto: | |
648af7fc | 843 | rxrpc_exit_security(); |
8addc044 WY |
844 | error_security: |
845 | destroy_workqueue(rxrpc_workqueue); | |
651350d1 | 846 | error_work_queue: |
17926a79 DH |
847 | kmem_cache_destroy(rxrpc_call_jar); |
848 | error_call_jar: | |
849 | return ret; | |
850 | } | |
851 | ||
852 | /* | |
853 | * unregister the RxRPC protocol | |
854 | */ | |
855 | static void __exit af_rxrpc_exit(void) | |
856 | { | |
857 | _enter(""); | |
5873c083 | 858 | rxrpc_sysctl_exit(); |
17926a79 DH |
859 | unregister_key_type(&key_type_rxrpc_s); |
860 | unregister_key_type(&key_type_rxrpc); | |
861 | sock_unregister(PF_RXRPC); | |
862 | proto_unregister(&rxrpc_proto); | |
863 | rxrpc_destroy_all_calls(); | |
864 | rxrpc_destroy_all_connections(); | |
71f3ca40 DH |
865 | ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0); |
866 | ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0); | |
4f95dd78 DH |
867 | rxrpc_destroy_all_locals(); |
868 | ||
ece31ffd G |
869 | remove_proc_entry("rxrpc_conns", init_net.proc_net); |
870 | remove_proc_entry("rxrpc_calls", init_net.proc_net); | |
651350d1 | 871 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 872 | rxrpc_exit_security(); |
17926a79 DH |
873 | kmem_cache_destroy(rxrpc_call_jar); |
874 | _leave(""); | |
875 | } | |
876 | ||
877 | module_init(af_rxrpc_init); | |
878 | module_exit(af_rxrpc_exit); |