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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 | 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 | ||
17926a79 DH |
41 | /* current debugging ID */ |
42 | atomic_t rxrpc_debug_id; | |
43 | ||
44 | /* count of skbs currently in use */ | |
71f3ca40 | 45 | atomic_t rxrpc_n_tx_skbs, rxrpc_n_rx_skbs; |
17926a79 | 46 | |
651350d1 DH |
47 | struct workqueue_struct *rxrpc_workqueue; |
48 | ||
17926a79 DH |
49 | static void rxrpc_sock_destructor(struct sock *); |
50 | ||
51 | /* | |
52 | * see if an RxRPC socket is currently writable | |
53 | */ | |
54 | static inline int rxrpc_writable(struct sock *sk) | |
55 | { | |
56 | return atomic_read(&sk->sk_wmem_alloc) < (size_t) sk->sk_sndbuf; | |
57 | } | |
58 | ||
59 | /* | |
60 | * wait for write bufferage to become available | |
61 | */ | |
62 | static void rxrpc_write_space(struct sock *sk) | |
63 | { | |
64 | _enter("%p", sk); | |
43815482 | 65 | rcu_read_lock(); |
17926a79 | 66 | if (rxrpc_writable(sk)) { |
43815482 ED |
67 | struct socket_wq *wq = rcu_dereference(sk->sk_wq); |
68 | ||
1ce0bf50 | 69 | if (skwq_has_sleeper(wq)) |
43815482 | 70 | wake_up_interruptible(&wq->wait); |
8d8ad9d7 | 71 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
17926a79 | 72 | } |
43815482 | 73 | rcu_read_unlock(); |
17926a79 DH |
74 | } |
75 | ||
76 | /* | |
77 | * validate an RxRPC address | |
78 | */ | |
79 | static int rxrpc_validate_address(struct rxrpc_sock *rx, | |
80 | struct sockaddr_rxrpc *srx, | |
81 | int len) | |
82 | { | |
dad8aff7 | 83 | unsigned int tail; |
ab802ee0 | 84 | |
17926a79 DH |
85 | if (len < sizeof(struct sockaddr_rxrpc)) |
86 | return -EINVAL; | |
87 | ||
88 | if (srx->srx_family != AF_RXRPC) | |
89 | return -EAFNOSUPPORT; | |
90 | ||
91 | if (srx->transport_type != SOCK_DGRAM) | |
92 | return -ESOCKTNOSUPPORT; | |
93 | ||
94 | len -= offsetof(struct sockaddr_rxrpc, transport); | |
95 | if (srx->transport_len < sizeof(sa_family_t) || | |
96 | srx->transport_len > len) | |
97 | return -EINVAL; | |
98 | ||
19ffa01c | 99 | if (srx->transport.family != rx->family) |
17926a79 DH |
100 | return -EAFNOSUPPORT; |
101 | ||
102 | switch (srx->transport.family) { | |
103 | case AF_INET: | |
4f95dd78 DH |
104 | if (srx->transport_len < sizeof(struct sockaddr_in)) |
105 | return -EINVAL; | |
ab802ee0 | 106 | tail = offsetof(struct sockaddr_rxrpc, transport.sin.__pad); |
17926a79 DH |
107 | break; |
108 | ||
d1912747 | 109 | #ifdef CONFIG_AF_RXRPC_IPV6 |
17926a79 | 110 | case AF_INET6: |
75b54cb5 DH |
111 | if (srx->transport_len < sizeof(struct sockaddr_in6)) |
112 | return -EINVAL; | |
113 | tail = offsetof(struct sockaddr_rxrpc, transport) + | |
114 | sizeof(struct sockaddr_in6); | |
115 | break; | |
d1912747 | 116 | #endif |
75b54cb5 | 117 | |
17926a79 DH |
118 | default: |
119 | return -EAFNOSUPPORT; | |
120 | } | |
121 | ||
ab802ee0 DH |
122 | if (tail < len) |
123 | memset((void *)srx + tail, 0, len - tail); | |
75b54cb5 | 124 | _debug("INET: %pISp", &srx->transport); |
17926a79 DH |
125 | return 0; |
126 | } | |
127 | ||
128 | /* | |
129 | * bind a local address to an RxRPC socket | |
130 | */ | |
131 | static int rxrpc_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
132 | { | |
b4f1342f | 133 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)saddr; |
17926a79 | 134 | struct rxrpc_local *local; |
68d6d1ae | 135 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
1e9e5c95 | 136 | u16 service_id = srx->srx_service; |
17926a79 DH |
137 | int ret; |
138 | ||
139 | _enter("%p,%p,%d", rx, saddr, len); | |
140 | ||
141 | ret = rxrpc_validate_address(rx, srx, len); | |
142 | if (ret < 0) | |
143 | goto error; | |
144 | ||
145 | lock_sock(&rx->sk); | |
146 | ||
28036f44 DH |
147 | switch (rx->sk.sk_state) { |
148 | case RXRPC_UNBOUND: | |
149 | rx->srx = *srx; | |
150 | local = rxrpc_lookup_local(sock_net(&rx->sk), &rx->srx); | |
151 | if (IS_ERR(local)) { | |
152 | ret = PTR_ERR(local); | |
153 | goto error_unlock; | |
154 | } | |
155 | ||
156 | if (service_id) { | |
157 | write_lock(&local->services_lock); | |
158 | if (rcu_access_pointer(local->service)) | |
159 | goto service_in_use; | |
160 | rx->local = local; | |
161 | rcu_assign_pointer(local->service, rx); | |
162 | write_unlock(&local->services_lock); | |
163 | ||
164 | rx->sk.sk_state = RXRPC_SERVER_BOUND; | |
165 | } else { | |
166 | rx->local = local; | |
167 | rx->sk.sk_state = RXRPC_CLIENT_BOUND; | |
168 | } | |
169 | break; | |
17926a79 | 170 | |
28036f44 DH |
171 | case RXRPC_SERVER_BOUND: |
172 | ret = -EINVAL; | |
173 | if (service_id == 0) | |
174 | goto error_unlock; | |
175 | ret = -EADDRINUSE; | |
176 | if (service_id == rx->srx.srx_service) | |
177 | goto error_unlock; | |
178 | ret = -EINVAL; | |
179 | srx->srx_service = rx->srx.srx_service; | |
180 | if (memcmp(srx, &rx->srx, sizeof(*srx)) != 0) | |
181 | goto error_unlock; | |
182 | rx->second_service = service_id; | |
183 | rx->sk.sk_state = RXRPC_SERVER_BOUND2; | |
184 | break; | |
17926a79 | 185 | |
28036f44 DH |
186 | default: |
187 | ret = -EINVAL; | |
17926a79 DH |
188 | goto error_unlock; |
189 | } | |
190 | ||
17926a79 DH |
191 | release_sock(&rx->sk); |
192 | _leave(" = 0"); | |
193 | return 0; | |
194 | ||
195 | service_in_use: | |
248f219c | 196 | write_unlock(&local->services_lock); |
2341e077 DH |
197 | rxrpc_put_local(local); |
198 | ret = -EADDRINUSE; | |
17926a79 DH |
199 | error_unlock: |
200 | release_sock(&rx->sk); | |
201 | error: | |
202 | _leave(" = %d", ret); | |
203 | return ret; | |
204 | } | |
205 | ||
206 | /* | |
207 | * set the number of pending calls permitted on a listening socket | |
208 | */ | |
209 | static int rxrpc_listen(struct socket *sock, int backlog) | |
210 | { | |
211 | struct sock *sk = sock->sk; | |
212 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
00e90712 | 213 | unsigned int max, old; |
17926a79 DH |
214 | int ret; |
215 | ||
216 | _enter("%p,%d", rx, backlog); | |
217 | ||
218 | lock_sock(&rx->sk); | |
219 | ||
220 | switch (rx->sk.sk_state) { | |
2341e077 | 221 | case RXRPC_UNBOUND: |
17926a79 DH |
222 | ret = -EADDRNOTAVAIL; |
223 | break; | |
17926a79 | 224 | case RXRPC_SERVER_BOUND: |
28036f44 | 225 | case RXRPC_SERVER_BOUND2: |
17926a79 | 226 | ASSERT(rx->local != NULL); |
0e119b41 DH |
227 | max = READ_ONCE(rxrpc_max_backlog); |
228 | ret = -EINVAL; | |
229 | if (backlog == INT_MAX) | |
230 | backlog = max; | |
231 | else if (backlog < 0 || backlog > max) | |
232 | break; | |
00e90712 | 233 | old = sk->sk_max_ack_backlog; |
17926a79 | 234 | sk->sk_max_ack_backlog = backlog; |
00e90712 DH |
235 | ret = rxrpc_service_prealloc(rx, GFP_KERNEL); |
236 | if (ret == 0) | |
237 | rx->sk.sk_state = RXRPC_SERVER_LISTENING; | |
238 | else | |
239 | sk->sk_max_ack_backlog = old; | |
17926a79 | 240 | break; |
210f0353 DH |
241 | case RXRPC_SERVER_LISTENING: |
242 | if (backlog == 0) { | |
243 | rx->sk.sk_state = RXRPC_SERVER_LISTEN_DISABLED; | |
244 | sk->sk_max_ack_backlog = 0; | |
245 | rxrpc_discard_prealloc(rx); | |
246 | ret = 0; | |
247 | break; | |
248 | } | |
0e119b41 DH |
249 | default: |
250 | ret = -EBUSY; | |
251 | break; | |
17926a79 DH |
252 | } |
253 | ||
254 | release_sock(&rx->sk); | |
255 | _leave(" = %d", ret); | |
256 | return ret; | |
257 | } | |
258 | ||
651350d1 DH |
259 | /** |
260 | * rxrpc_kernel_begin_call - Allow a kernel service to begin a call | |
261 | * @sock: The socket on which to make the call | |
2341e077 | 262 | * @srx: The address of the peer to contact |
651350d1 DH |
263 | * @key: The security context to use (defaults to socket setting) |
264 | * @user_call_ID: The ID to use | |
d001648e DH |
265 | * @gfp: The allocation constraints |
266 | * @notify_rx: Where to send notifications instead of socket queue | |
651350d1 DH |
267 | * |
268 | * Allow a kernel service to begin a call on the nominated socket. This just | |
269 | * sets up all the internal tracking structures and allocates connection and | |
270 | * call IDs as appropriate. The call to be used is returned. | |
271 | * | |
272 | * The default socket destination address and security may be overridden by | |
273 | * supplying @srx and @key. | |
274 | */ | |
275 | struct rxrpc_call *rxrpc_kernel_begin_call(struct socket *sock, | |
276 | struct sockaddr_rxrpc *srx, | |
277 | struct key *key, | |
278 | unsigned long user_call_ID, | |
d001648e DH |
279 | gfp_t gfp, |
280 | rxrpc_notify_rx_t notify_rx) | |
651350d1 | 281 | { |
19ffa01c | 282 | struct rxrpc_conn_parameters cp; |
651350d1 DH |
283 | struct rxrpc_call *call; |
284 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
f4552c2d | 285 | int ret; |
651350d1 DH |
286 | |
287 | _enter(",,%x,%lx", key_serial(key), user_call_ID); | |
288 | ||
f4552c2d DH |
289 | ret = rxrpc_validate_address(rx, srx, sizeof(*srx)); |
290 | if (ret < 0) | |
291 | return ERR_PTR(ret); | |
292 | ||
651350d1 DH |
293 | lock_sock(&rx->sk); |
294 | ||
19ffa01c DH |
295 | if (!key) |
296 | key = rx->key; | |
297 | if (key && !key->payload.data[0]) | |
298 | key = NULL; /* a no-security key */ | |
299 | ||
300 | memset(&cp, 0, sizeof(cp)); | |
301 | cp.local = rx->local; | |
302 | cp.key = key; | |
303 | cp.security_level = 0; | |
304 | cp.exclusive = false; | |
305 | cp.service_id = srx->srx_service; | |
aa390bbe | 306 | call = rxrpc_new_client_call(rx, &cp, srx, user_call_ID, gfp); |
540b1c48 | 307 | /* The socket has been unlocked. */ |
d001648e DH |
308 | if (!IS_ERR(call)) |
309 | call->notify_rx = notify_rx; | |
19ffa01c | 310 | |
540b1c48 | 311 | mutex_unlock(&call->user_mutex); |
651350d1 DH |
312 | _leave(" = %p", call); |
313 | return call; | |
314 | } | |
651350d1 DH |
315 | EXPORT_SYMBOL(rxrpc_kernel_begin_call); |
316 | ||
317 | /** | |
318 | * rxrpc_kernel_end_call - Allow a kernel service to end a call it was using | |
4de48af6 | 319 | * @sock: The socket the call is on |
651350d1 DH |
320 | * @call: The call to end |
321 | * | |
322 | * Allow a kernel service to end a call it was using. The call must be | |
323 | * complete before this is called (the call should be aborted if necessary). | |
324 | */ | |
4de48af6 | 325 | void rxrpc_kernel_end_call(struct socket *sock, struct rxrpc_call *call) |
651350d1 DH |
326 | { |
327 | _enter("%d{%d}", call->debug_id, atomic_read(&call->usage)); | |
540b1c48 DH |
328 | |
329 | mutex_lock(&call->user_mutex); | |
8d94aa38 | 330 | rxrpc_release_call(rxrpc_sk(sock->sk), call); |
540b1c48 | 331 | mutex_unlock(&call->user_mutex); |
cbd00891 | 332 | rxrpc_put_call(call, rxrpc_call_put_kernel); |
651350d1 | 333 | } |
651350d1 DH |
334 | EXPORT_SYMBOL(rxrpc_kernel_end_call); |
335 | ||
336 | /** | |
d001648e | 337 | * rxrpc_kernel_new_call_notification - Get notifications of new calls |
651350d1 | 338 | * @sock: The socket to intercept received messages on |
d001648e | 339 | * @notify_new_call: Function to be called when new calls appear |
00e90712 | 340 | * @discard_new_call: Function to discard preallocated calls |
651350d1 | 341 | * |
d001648e | 342 | * Allow a kernel service to be given notifications about new calls. |
651350d1 | 343 | */ |
d001648e DH |
344 | void rxrpc_kernel_new_call_notification( |
345 | struct socket *sock, | |
00e90712 DH |
346 | rxrpc_notify_new_call_t notify_new_call, |
347 | rxrpc_discard_new_call_t discard_new_call) | |
651350d1 DH |
348 | { |
349 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
350 | ||
d001648e | 351 | rx->notify_new_call = notify_new_call; |
00e90712 | 352 | rx->discard_new_call = discard_new_call; |
651350d1 | 353 | } |
d001648e | 354 | EXPORT_SYMBOL(rxrpc_kernel_new_call_notification); |
651350d1 | 355 | |
17926a79 DH |
356 | /* |
357 | * connect an RxRPC socket | |
358 | * - this just targets it at a specific destination; no actual connection | |
359 | * negotiation takes place | |
360 | */ | |
361 | static int rxrpc_connect(struct socket *sock, struct sockaddr *addr, | |
362 | int addr_len, int flags) | |
363 | { | |
2341e077 DH |
364 | struct sockaddr_rxrpc *srx = (struct sockaddr_rxrpc *)addr; |
365 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
17926a79 DH |
366 | int ret; |
367 | ||
368 | _enter("%p,%p,%d,%d", rx, addr, addr_len, flags); | |
369 | ||
370 | ret = rxrpc_validate_address(rx, srx, addr_len); | |
371 | if (ret < 0) { | |
372 | _leave(" = %d [bad addr]", ret); | |
373 | return ret; | |
374 | } | |
375 | ||
376 | lock_sock(&rx->sk); | |
377 | ||
2341e077 DH |
378 | ret = -EISCONN; |
379 | if (test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) | |
380 | goto error; | |
381 | ||
17926a79 | 382 | switch (rx->sk.sk_state) { |
2341e077 DH |
383 | case RXRPC_UNBOUND: |
384 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
385 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 DH |
386 | case RXRPC_CLIENT_BOUND: |
387 | break; | |
17926a79 | 388 | default: |
2341e077 DH |
389 | ret = -EBUSY; |
390 | goto error; | |
17926a79 DH |
391 | } |
392 | ||
2341e077 DH |
393 | rx->connect_srx = *srx; |
394 | set_bit(RXRPC_SOCK_CONNECTED, &rx->flags); | |
395 | ret = 0; | |
17926a79 | 396 | |
2341e077 | 397 | error: |
17926a79 | 398 | release_sock(&rx->sk); |
2341e077 | 399 | return ret; |
17926a79 DH |
400 | } |
401 | ||
402 | /* | |
403 | * send a message through an RxRPC socket | |
404 | * - in a client this does a number of things: | |
405 | * - finds/sets up a connection for the security specified (if any) | |
406 | * - initiates a call (ID in control data) | |
407 | * - ends the request phase of a call (if MSG_MORE is not set) | |
408 | * - sends a call data packet | |
409 | * - may send an abort (abort code in control data) | |
410 | */ | |
1b784140 | 411 | static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
17926a79 | 412 | { |
2341e077 | 413 | struct rxrpc_local *local; |
17926a79 DH |
414 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); |
415 | int ret; | |
416 | ||
417 | _enter(",{%d},,%zu", rx->sk.sk_state, len); | |
418 | ||
419 | if (m->msg_flags & MSG_OOB) | |
420 | return -EOPNOTSUPP; | |
421 | ||
422 | if (m->msg_name) { | |
423 | ret = rxrpc_validate_address(rx, m->msg_name, m->msg_namelen); | |
424 | if (ret < 0) { | |
425 | _leave(" = %d [bad addr]", ret); | |
426 | return ret; | |
427 | } | |
428 | } | |
429 | ||
17926a79 DH |
430 | lock_sock(&rx->sk); |
431 | ||
17926a79 | 432 | switch (rx->sk.sk_state) { |
2341e077 | 433 | case RXRPC_UNBOUND: |
cd5892c7 DH |
434 | rx->srx.srx_family = AF_RXRPC; |
435 | rx->srx.srx_service = 0; | |
436 | rx->srx.transport_type = SOCK_DGRAM; | |
437 | rx->srx.transport.family = rx->family; | |
438 | switch (rx->family) { | |
439 | case AF_INET: | |
440 | rx->srx.transport_len = sizeof(struct sockaddr_in); | |
441 | break; | |
d1912747 | 442 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
443 | case AF_INET6: |
444 | rx->srx.transport_len = sizeof(struct sockaddr_in6); | |
445 | break; | |
d1912747 | 446 | #endif |
cd5892c7 DH |
447 | default: |
448 | ret = -EAFNOSUPPORT; | |
449 | goto error_unlock; | |
450 | } | |
2baec2c3 | 451 | local = rxrpc_lookup_local(sock_net(sock->sk), &rx->srx); |
2341e077 DH |
452 | if (IS_ERR(local)) { |
453 | ret = PTR_ERR(local); | |
454 | goto error_unlock; | |
17926a79 | 455 | } |
2341e077 DH |
456 | |
457 | rx->local = local; | |
458 | rx->sk.sk_state = RXRPC_CLIENT_UNBOUND; | |
459 | /* Fall through */ | |
460 | ||
461 | case RXRPC_CLIENT_UNBOUND: | |
17926a79 | 462 | case RXRPC_CLIENT_BOUND: |
2341e077 DH |
463 | if (!m->msg_name && |
464 | test_bit(RXRPC_SOCK_CONNECTED, &rx->flags)) { | |
465 | m->msg_name = &rx->connect_srx; | |
466 | m->msg_namelen = sizeof(rx->connect_srx); | |
17926a79 | 467 | } |
2341e077 DH |
468 | case RXRPC_SERVER_BOUND: |
469 | case RXRPC_SERVER_LISTENING: | |
470 | ret = rxrpc_do_sendmsg(rx, m, len); | |
540b1c48 DH |
471 | /* The socket has been unlocked */ |
472 | goto out; | |
17926a79 | 473 | default: |
2341e077 | 474 | ret = -EINVAL; |
540b1c48 | 475 | goto error_unlock; |
17926a79 DH |
476 | } |
477 | ||
2341e077 | 478 | error_unlock: |
17926a79 | 479 | release_sock(&rx->sk); |
540b1c48 | 480 | out: |
17926a79 DH |
481 | _leave(" = %d", ret); |
482 | return ret; | |
483 | } | |
484 | ||
485 | /* | |
486 | * set RxRPC socket options | |
487 | */ | |
488 | static int rxrpc_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 489 | char __user *optval, unsigned int optlen) |
17926a79 DH |
490 | { |
491 | struct rxrpc_sock *rx = rxrpc_sk(sock->sk); | |
95c96174 | 492 | unsigned int min_sec_level; |
4722974d | 493 | u16 service_upgrade[2]; |
17926a79 DH |
494 | int ret; |
495 | ||
496 | _enter(",%d,%d,,%d", level, optname, optlen); | |
497 | ||
498 | lock_sock(&rx->sk); | |
499 | ret = -EOPNOTSUPP; | |
500 | ||
501 | if (level == SOL_RXRPC) { | |
502 | switch (optname) { | |
503 | case RXRPC_EXCLUSIVE_CONNECTION: | |
504 | ret = -EINVAL; | |
505 | if (optlen != 0) | |
506 | goto error; | |
507 | ret = -EISCONN; | |
2341e077 | 508 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 | 509 | goto error; |
cc8feb8e | 510 | rx->exclusive = true; |
17926a79 DH |
511 | goto success; |
512 | ||
513 | case RXRPC_SECURITY_KEY: | |
514 | ret = -EINVAL; | |
515 | if (rx->key) | |
516 | goto error; | |
517 | ret = -EISCONN; | |
2341e077 | 518 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
519 | goto error; |
520 | ret = rxrpc_request_key(rx, optval, optlen); | |
521 | goto error; | |
522 | ||
523 | case RXRPC_SECURITY_KEYRING: | |
524 | ret = -EINVAL; | |
525 | if (rx->key) | |
526 | goto error; | |
527 | ret = -EISCONN; | |
2341e077 | 528 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
529 | goto error; |
530 | ret = rxrpc_server_keyring(rx, optval, optlen); | |
531 | goto error; | |
532 | ||
533 | case RXRPC_MIN_SECURITY_LEVEL: | |
534 | ret = -EINVAL; | |
95c96174 | 535 | if (optlen != sizeof(unsigned int)) |
17926a79 DH |
536 | goto error; |
537 | ret = -EISCONN; | |
2341e077 | 538 | if (rx->sk.sk_state != RXRPC_UNBOUND) |
17926a79 DH |
539 | goto error; |
540 | ret = get_user(min_sec_level, | |
95c96174 | 541 | (unsigned int __user *) optval); |
17926a79 DH |
542 | if (ret < 0) |
543 | goto error; | |
544 | ret = -EINVAL; | |
545 | if (min_sec_level > RXRPC_SECURITY_MAX) | |
546 | goto error; | |
547 | rx->min_sec_level = min_sec_level; | |
548 | goto success; | |
549 | ||
4722974d DH |
550 | case RXRPC_UPGRADEABLE_SERVICE: |
551 | ret = -EINVAL; | |
552 | if (optlen != sizeof(service_upgrade) || | |
553 | rx->service_upgrade.from != 0) | |
554 | goto error; | |
555 | ret = -EISCONN; | |
556 | if (rx->sk.sk_state != RXRPC_SERVER_BOUND2) | |
557 | goto error; | |
558 | ret = -EFAULT; | |
559 | if (copy_from_user(service_upgrade, optval, | |
560 | sizeof(service_upgrade)) != 0) | |
561 | goto error; | |
562 | ret = -EINVAL; | |
563 | if ((service_upgrade[0] != rx->srx.srx_service || | |
564 | service_upgrade[1] != rx->second_service) && | |
565 | (service_upgrade[0] != rx->second_service || | |
566 | service_upgrade[1] != rx->srx.srx_service)) | |
567 | goto error; | |
568 | rx->service_upgrade.from = service_upgrade[0]; | |
569 | rx->service_upgrade.to = service_upgrade[1]; | |
570 | goto success; | |
571 | ||
17926a79 DH |
572 | default: |
573 | break; | |
574 | } | |
575 | } | |
576 | ||
577 | success: | |
578 | ret = 0; | |
579 | error: | |
580 | release_sock(&rx->sk); | |
581 | return ret; | |
582 | } | |
583 | ||
584 | /* | |
585 | * permit an RxRPC socket to be polled | |
586 | */ | |
587 | static unsigned int rxrpc_poll(struct file *file, struct socket *sock, | |
588 | poll_table *wait) | |
589 | { | |
17926a79 | 590 | struct sock *sk = sock->sk; |
248f219c DH |
591 | struct rxrpc_sock *rx = rxrpc_sk(sk); |
592 | unsigned int mask; | |
17926a79 | 593 | |
aa395145 | 594 | sock_poll_wait(file, sk_sleep(sk), wait); |
17926a79 DH |
595 | mask = 0; |
596 | ||
597 | /* the socket is readable if there are any messages waiting on the Rx | |
598 | * queue */ | |
248f219c | 599 | if (!list_empty(&rx->recvmsg_q)) |
17926a79 DH |
600 | mask |= POLLIN | POLLRDNORM; |
601 | ||
602 | /* the socket is writable if there is space to add new data to the | |
603 | * socket; there is no guarantee that any particular call in progress | |
604 | * on the socket may have space in the Tx ACK window */ | |
605 | if (rxrpc_writable(sk)) | |
606 | mask |= POLLOUT | POLLWRNORM; | |
607 | ||
608 | return mask; | |
609 | } | |
610 | ||
611 | /* | |
612 | * create an RxRPC socket | |
613 | */ | |
3f378b68 EP |
614 | static int rxrpc_create(struct net *net, struct socket *sock, int protocol, |
615 | int kern) | |
17926a79 DH |
616 | { |
617 | struct rxrpc_sock *rx; | |
618 | struct sock *sk; | |
619 | ||
620 | _enter("%p,%d", sock, protocol); | |
621 | ||
b4f1342f | 622 | /* we support transport protocol UDP/UDP6 only */ |
d1912747 DH |
623 | if (protocol != PF_INET && |
624 | IS_ENABLED(CONFIG_AF_RXRPC_IPV6) && protocol != PF_INET6) | |
17926a79 DH |
625 | return -EPROTONOSUPPORT; |
626 | ||
627 | if (sock->type != SOCK_DGRAM) | |
628 | return -ESOCKTNOSUPPORT; | |
629 | ||
630 | sock->ops = &rxrpc_rpc_ops; | |
631 | sock->state = SS_UNCONNECTED; | |
632 | ||
11aa9c28 | 633 | sk = sk_alloc(net, PF_RXRPC, GFP_KERNEL, &rxrpc_proto, kern); |
17926a79 DH |
634 | if (!sk) |
635 | return -ENOMEM; | |
636 | ||
637 | sock_init_data(sock, sk); | |
8d94aa38 | 638 | sock_set_flag(sk, SOCK_RCU_FREE); |
2341e077 | 639 | sk->sk_state = RXRPC_UNBOUND; |
17926a79 | 640 | sk->sk_write_space = rxrpc_write_space; |
0e119b41 | 641 | sk->sk_max_ack_backlog = 0; |
17926a79 DH |
642 | sk->sk_destruct = rxrpc_sock_destructor; |
643 | ||
644 | rx = rxrpc_sk(sk); | |
19ffa01c | 645 | rx->family = protocol; |
17926a79 DH |
646 | rx->calls = RB_ROOT; |
647 | ||
248f219c DH |
648 | spin_lock_init(&rx->incoming_lock); |
649 | INIT_LIST_HEAD(&rx->sock_calls); | |
650 | INIT_LIST_HEAD(&rx->to_be_accepted); | |
651 | INIT_LIST_HEAD(&rx->recvmsg_q); | |
652 | rwlock_init(&rx->recvmsg_lock); | |
17926a79 DH |
653 | rwlock_init(&rx->call_lock); |
654 | memset(&rx->srx, 0, sizeof(rx->srx)); | |
655 | ||
656 | _leave(" = 0 [%p]", rx); | |
657 | return 0; | |
658 | } | |
659 | ||
248f219c DH |
660 | /* |
661 | * Kill all the calls on a socket and shut it down. | |
662 | */ | |
663 | static int rxrpc_shutdown(struct socket *sock, int flags) | |
664 | { | |
665 | struct sock *sk = sock->sk; | |
666 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
667 | int ret = 0; | |
668 | ||
669 | _enter("%p,%d", sk, flags); | |
670 | ||
671 | if (flags != SHUT_RDWR) | |
672 | return -EOPNOTSUPP; | |
673 | if (sk->sk_state == RXRPC_CLOSE) | |
674 | return -ESHUTDOWN; | |
675 | ||
676 | lock_sock(sk); | |
677 | ||
678 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
679 | if (sk->sk_state < RXRPC_CLOSE) { | |
680 | sk->sk_state = RXRPC_CLOSE; | |
681 | sk->sk_shutdown = SHUTDOWN_MASK; | |
682 | } else { | |
683 | ret = -ESHUTDOWN; | |
684 | } | |
685 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
686 | ||
687 | rxrpc_discard_prealloc(rx); | |
688 | ||
689 | release_sock(sk); | |
690 | return ret; | |
691 | } | |
692 | ||
17926a79 DH |
693 | /* |
694 | * RxRPC socket destructor | |
695 | */ | |
696 | static void rxrpc_sock_destructor(struct sock *sk) | |
697 | { | |
698 | _enter("%p", sk); | |
699 | ||
700 | rxrpc_purge_queue(&sk->sk_receive_queue); | |
701 | ||
547b792c IJ |
702 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
703 | WARN_ON(!sk_unhashed(sk)); | |
704 | WARN_ON(sk->sk_socket); | |
17926a79 DH |
705 | |
706 | if (!sock_flag(sk, SOCK_DEAD)) { | |
707 | printk("Attempt to release alive rxrpc socket: %p\n", sk); | |
708 | return; | |
709 | } | |
710 | } | |
711 | ||
712 | /* | |
713 | * release an RxRPC socket | |
714 | */ | |
715 | static int rxrpc_release_sock(struct sock *sk) | |
716 | { | |
717 | struct rxrpc_sock *rx = rxrpc_sk(sk); | |
718 | ||
719 | _enter("%p{%d,%d}", sk, sk->sk_state, atomic_read(&sk->sk_refcnt)); | |
720 | ||
721 | /* declare the socket closed for business */ | |
722 | sock_orphan(sk); | |
723 | sk->sk_shutdown = SHUTDOWN_MASK; | |
724 | ||
725 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
726 | sk->sk_state = RXRPC_CLOSE; | |
727 | spin_unlock_bh(&sk->sk_receive_queue.lock); | |
728 | ||
b63452c1 | 729 | if (rx->local && rcu_access_pointer(rx->local->service) == rx) { |
248f219c | 730 | write_lock(&rx->local->services_lock); |
b63452c1 | 731 | rcu_assign_pointer(rx->local->service, NULL); |
248f219c | 732 | write_unlock(&rx->local->services_lock); |
17926a79 DH |
733 | } |
734 | ||
735 | /* try to flush out this socket */ | |
00e90712 | 736 | rxrpc_discard_prealloc(rx); |
17926a79 | 737 | rxrpc_release_calls_on_socket(rx); |
651350d1 | 738 | flush_workqueue(rxrpc_workqueue); |
17926a79 DH |
739 | rxrpc_purge_queue(&sk->sk_receive_queue); |
740 | ||
5627cc8b DH |
741 | rxrpc_put_local(rx->local); |
742 | rx->local = NULL; | |
17926a79 DH |
743 | key_put(rx->key); |
744 | rx->key = NULL; | |
745 | key_put(rx->securities); | |
746 | rx->securities = NULL; | |
747 | sock_put(sk); | |
748 | ||
749 | _leave(" = 0"); | |
750 | return 0; | |
751 | } | |
752 | ||
753 | /* | |
754 | * release an RxRPC BSD socket on close() or equivalent | |
755 | */ | |
756 | static int rxrpc_release(struct socket *sock) | |
757 | { | |
758 | struct sock *sk = sock->sk; | |
759 | ||
760 | _enter("%p{%p}", sock, sk); | |
761 | ||
762 | if (!sk) | |
763 | return 0; | |
764 | ||
765 | sock->sk = NULL; | |
766 | ||
767 | return rxrpc_release_sock(sk); | |
768 | } | |
769 | ||
770 | /* | |
771 | * RxRPC network protocol | |
772 | */ | |
773 | static const struct proto_ops rxrpc_rpc_ops = { | |
e33b3d97 | 774 | .family = PF_RXRPC, |
17926a79 DH |
775 | .owner = THIS_MODULE, |
776 | .release = rxrpc_release, | |
777 | .bind = rxrpc_bind, | |
778 | .connect = rxrpc_connect, | |
779 | .socketpair = sock_no_socketpair, | |
780 | .accept = sock_no_accept, | |
781 | .getname = sock_no_getname, | |
782 | .poll = rxrpc_poll, | |
783 | .ioctl = sock_no_ioctl, | |
784 | .listen = rxrpc_listen, | |
248f219c | 785 | .shutdown = rxrpc_shutdown, |
17926a79 DH |
786 | .setsockopt = rxrpc_setsockopt, |
787 | .getsockopt = sock_no_getsockopt, | |
788 | .sendmsg = rxrpc_sendmsg, | |
789 | .recvmsg = rxrpc_recvmsg, | |
790 | .mmap = sock_no_mmap, | |
791 | .sendpage = sock_no_sendpage, | |
792 | }; | |
793 | ||
794 | static struct proto rxrpc_proto = { | |
795 | .name = "RXRPC", | |
796 | .owner = THIS_MODULE, | |
797 | .obj_size = sizeof(struct rxrpc_sock), | |
0d12f8a4 | 798 | .max_header = sizeof(struct rxrpc_wire_header), |
17926a79 DH |
799 | }; |
800 | ||
ec1b4cf7 | 801 | static const struct net_proto_family rxrpc_family_ops = { |
17926a79 DH |
802 | .family = PF_RXRPC, |
803 | .create = rxrpc_create, | |
804 | .owner = THIS_MODULE, | |
805 | }; | |
806 | ||
807 | /* | |
808 | * initialise and register the RxRPC protocol | |
809 | */ | |
810 | static int __init af_rxrpc_init(void) | |
811 | { | |
17926a79 | 812 | int ret = -1; |
44430612 | 813 | unsigned int tmp; |
17926a79 | 814 | |
ce6654cf | 815 | BUILD_BUG_ON(sizeof(struct rxrpc_skb_priv) > FIELD_SIZEOF(struct sk_buff, cb)); |
17926a79 | 816 | |
44430612 MW |
817 | get_random_bytes(&tmp, sizeof(tmp)); |
818 | tmp &= 0x3fffffff; | |
819 | if (tmp == 0) | |
820 | tmp = 1; | |
821 | idr_set_cursor(&rxrpc_client_conn_ids, tmp); | |
17926a79 | 822 | |
651350d1 | 823 | ret = -ENOMEM; |
17926a79 DH |
824 | rxrpc_call_jar = kmem_cache_create( |
825 | "rxrpc_call_jar", sizeof(struct rxrpc_call), 0, | |
20c2df83 | 826 | SLAB_HWCACHE_ALIGN, NULL); |
17926a79 | 827 | if (!rxrpc_call_jar) { |
9b6d5398 | 828 | pr_notice("Failed to allocate call jar\n"); |
17926a79 DH |
829 | goto error_call_jar; |
830 | } | |
831 | ||
e1fcc7e2 | 832 | rxrpc_workqueue = alloc_workqueue("krxrpcd", 0, 1); |
651350d1 | 833 | if (!rxrpc_workqueue) { |
9b6d5398 | 834 | pr_notice("Failed to allocate work queue\n"); |
651350d1 DH |
835 | goto error_work_queue; |
836 | } | |
837 | ||
648af7fc DH |
838 | ret = rxrpc_init_security(); |
839 | if (ret < 0) { | |
9b6d5398 | 840 | pr_crit("Cannot initialise security\n"); |
648af7fc DH |
841 | goto error_security; |
842 | } | |
843 | ||
2baec2c3 DH |
844 | ret = register_pernet_subsys(&rxrpc_net_ops); |
845 | if (ret) | |
846 | goto error_pernet; | |
847 | ||
17926a79 | 848 | ret = proto_register(&rxrpc_proto, 1); |
1c899641 | 849 | if (ret < 0) { |
9b6d5398 | 850 | pr_crit("Cannot register protocol\n"); |
17926a79 DH |
851 | goto error_proto; |
852 | } | |
853 | ||
854 | ret = sock_register(&rxrpc_family_ops); | |
855 | if (ret < 0) { | |
9b6d5398 | 856 | pr_crit("Cannot register socket family\n"); |
17926a79 DH |
857 | goto error_sock; |
858 | } | |
859 | ||
860 | ret = register_key_type(&key_type_rxrpc); | |
861 | if (ret < 0) { | |
9b6d5398 | 862 | pr_crit("Cannot register client key type\n"); |
17926a79 DH |
863 | goto error_key_type; |
864 | } | |
865 | ||
866 | ret = register_key_type(&key_type_rxrpc_s); | |
867 | if (ret < 0) { | |
9b6d5398 | 868 | pr_crit("Cannot register server key type\n"); |
17926a79 DH |
869 | goto error_key_type_s; |
870 | } | |
871 | ||
5873c083 DH |
872 | ret = rxrpc_sysctl_init(); |
873 | if (ret < 0) { | |
9b6d5398 | 874 | pr_crit("Cannot register sysctls\n"); |
5873c083 DH |
875 | goto error_sysctls; |
876 | } | |
877 | ||
17926a79 DH |
878 | return 0; |
879 | ||
5873c083 DH |
880 | error_sysctls: |
881 | unregister_key_type(&key_type_rxrpc_s); | |
17926a79 DH |
882 | error_key_type_s: |
883 | unregister_key_type(&key_type_rxrpc); | |
884 | error_key_type: | |
885 | sock_unregister(PF_RXRPC); | |
886 | error_sock: | |
887 | proto_unregister(&rxrpc_proto); | |
888 | error_proto: | |
2baec2c3 DH |
889 | unregister_pernet_subsys(&rxrpc_net_ops); |
890 | error_pernet: | |
648af7fc | 891 | rxrpc_exit_security(); |
8addc044 WY |
892 | error_security: |
893 | destroy_workqueue(rxrpc_workqueue); | |
651350d1 | 894 | error_work_queue: |
17926a79 DH |
895 | kmem_cache_destroy(rxrpc_call_jar); |
896 | error_call_jar: | |
897 | return ret; | |
898 | } | |
899 | ||
900 | /* | |
901 | * unregister the RxRPC protocol | |
902 | */ | |
903 | static void __exit af_rxrpc_exit(void) | |
904 | { | |
905 | _enter(""); | |
5873c083 | 906 | rxrpc_sysctl_exit(); |
17926a79 DH |
907 | unregister_key_type(&key_type_rxrpc_s); |
908 | unregister_key_type(&key_type_rxrpc); | |
909 | sock_unregister(PF_RXRPC); | |
910 | proto_unregister(&rxrpc_proto); | |
2baec2c3 | 911 | unregister_pernet_subsys(&rxrpc_net_ops); |
71f3ca40 DH |
912 | ASSERTCMP(atomic_read(&rxrpc_n_tx_skbs), ==, 0); |
913 | ASSERTCMP(atomic_read(&rxrpc_n_rx_skbs), ==, 0); | |
4f95dd78 | 914 | |
2baec2c3 DH |
915 | /* Make sure the local and peer records pinned by any dying connections |
916 | * are released. | |
917 | */ | |
918 | rcu_barrier(); | |
919 | rxrpc_destroy_client_conn_ids(); | |
920 | ||
651350d1 | 921 | destroy_workqueue(rxrpc_workqueue); |
648af7fc | 922 | rxrpc_exit_security(); |
17926a79 DH |
923 | kmem_cache_destroy(rxrpc_call_jar); |
924 | _leave(""); | |
925 | } | |
926 | ||
927 | module_init(af_rxrpc_init); | |
928 | module_exit(af_rxrpc_exit); |