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