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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/socket.c: TIPC socket API | |
c4307285 | 3 | * |
e643df15 | 4 | * Copyright (c) 2001-2007, 2012 Ericsson AB |
c5fa7b3c | 5 | * Copyright (c) 2004-2008, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
b97bf3fd | 37 | #include "core.h" |
d265fef6 | 38 | #include "port.h" |
b97bf3fd | 39 | |
2cf8aa19 EH |
40 | #include <linux/export.h> |
41 | #include <net/sock.h> | |
42 | ||
b97bf3fd PL |
43 | #define SS_LISTENING -1 /* socket is listening */ |
44 | #define SS_READY -2 /* socket is connectionless */ | |
45 | ||
3654ea02 | 46 | #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */ |
b97bf3fd PL |
47 | |
48 | struct tipc_sock { | |
49 | struct sock sk; | |
50 | struct tipc_port *p; | |
2da59918 | 51 | struct tipc_portid peer_name; |
a0f40f02 | 52 | unsigned int conn_timeout; |
b97bf3fd PL |
53 | }; |
54 | ||
0c3141e9 | 55 | #define tipc_sk(sk) ((struct tipc_sock *)(sk)) |
e3192690 | 56 | #define tipc_sk_port(sk) (tipc_sk(sk)->p) |
b97bf3fd | 57 | |
71092ea1 AS |
58 | #define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \ |
59 | (sock->state == SS_DISCONNECTING)) | |
60 | ||
0c3141e9 | 61 | static int backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b97bf3fd PL |
62 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); |
63 | static void wakeupdispatch(struct tipc_port *tport); | |
f288bef4 YX |
64 | static void tipc_data_ready(struct sock *sk, int len); |
65 | static void tipc_write_space(struct sock *sk); | |
c5fa7b3c YX |
66 | static int release(struct socket *sock); |
67 | static int accept(struct socket *sock, struct socket *new_sock, int flags); | |
b97bf3fd | 68 | |
bca65eae FW |
69 | static const struct proto_ops packet_ops; |
70 | static const struct proto_ops stream_ops; | |
71 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
72 | |
73 | static struct proto tipc_proto; | |
c5fa7b3c | 74 | static struct proto tipc_proto_kern; |
b97bf3fd | 75 | |
e3ec9c7d | 76 | static int sockets_enabled; |
b97bf3fd | 77 | |
c4307285 | 78 | /* |
0c3141e9 AS |
79 | * Revised TIPC socket locking policy: |
80 | * | |
81 | * Most socket operations take the standard socket lock when they start | |
82 | * and hold it until they finish (or until they need to sleep). Acquiring | |
83 | * this lock grants the owner exclusive access to the fields of the socket | |
84 | * data structures, with the exception of the backlog queue. A few socket | |
85 | * operations can be done without taking the socket lock because they only | |
86 | * read socket information that never changes during the life of the socket. | |
87 | * | |
88 | * Socket operations may acquire the lock for the associated TIPC port if they | |
89 | * need to perform an operation on the port. If any routine needs to acquire | |
90 | * both the socket lock and the port lock it must take the socket lock first | |
91 | * to avoid the risk of deadlock. | |
92 | * | |
93 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
94 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
95 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
96 | * and either handles the message itself or adds it to the socket's backlog | |
97 | * queue; in the latter case the queued message is processed once the process | |
98 | * owning the socket lock releases it. | |
99 | * | |
100 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
101 | * the problem of a blocked socket operation preventing any other operations | |
102 | * from occurring. However, applications must be careful if they have | |
103 | * multiple threads trying to send (or receive) on the same socket, as these | |
104 | * operations might interfere with each other. For example, doing a connect | |
105 | * and a receive at the same time might allow the receive to consume the | |
106 | * ACK message meant for the connect. While additional work could be done | |
107 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
108 | * | |
109 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
110 | * that another operation that must be performed in a non-blocking manner is | |
111 | * not delayed for very long because the lock has already been taken. | |
112 | * | |
113 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
114 | * constant over its lifetime; such fields can be examined without taking | |
115 | * the socket lock and/or port lock, and do not need to be re-read even | |
116 | * after resuming processing after waiting. These fields include: | |
117 | * - socket type | |
118 | * - pointer to socket sk structure (aka tipc_sock structure) | |
119 | * - pointer to port structure | |
120 | * - port reference | |
121 | */ | |
122 | ||
123 | /** | |
124 | * advance_rx_queue - discard first buffer in socket receive queue | |
125 | * | |
126 | * Caller must hold socket lock | |
b97bf3fd | 127 | */ |
0c3141e9 | 128 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 129 | { |
5f6d9123 | 130 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
131 | } |
132 | ||
b97bf3fd | 133 | /** |
0c3141e9 AS |
134 | * reject_rx_queue - reject all buffers in socket receive queue |
135 | * | |
136 | * Caller must hold socket lock | |
b97bf3fd | 137 | */ |
0c3141e9 | 138 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 139 | { |
0c3141e9 AS |
140 | struct sk_buff *buf; |
141 | ||
9da3d475 | 142 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) |
0c3141e9 | 143 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
b97bf3fd PL |
144 | } |
145 | ||
146 | /** | |
c5fa7b3c | 147 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 148 | * @net: network namespace (must be default network) |
b97bf3fd PL |
149 | * @sock: pre-allocated socket structure |
150 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 151 | * @kern: caused by kernel or by userspace? |
c4307285 | 152 | * |
0c3141e9 AS |
153 | * This routine creates additional data structures used by the TIPC socket, |
154 | * initializes them, and links them together. | |
b97bf3fd PL |
155 | * |
156 | * Returns 0 on success, errno otherwise | |
157 | */ | |
c5fa7b3c YX |
158 | static int tipc_sk_create(struct net *net, struct socket *sock, int protocol, |
159 | int kern) | |
b97bf3fd | 160 | { |
0c3141e9 AS |
161 | const struct proto_ops *ops; |
162 | socket_state state; | |
b97bf3fd | 163 | struct sock *sk; |
7ef43eba | 164 | struct tipc_port *tp_ptr; |
0c3141e9 AS |
165 | |
166 | /* Validate arguments */ | |
b97bf3fd PL |
167 | if (unlikely(protocol != 0)) |
168 | return -EPROTONOSUPPORT; | |
169 | ||
b97bf3fd PL |
170 | switch (sock->type) { |
171 | case SOCK_STREAM: | |
0c3141e9 AS |
172 | ops = &stream_ops; |
173 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
174 | break; |
175 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
176 | ops = &packet_ops; |
177 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
178 | break; |
179 | case SOCK_DGRAM: | |
b97bf3fd | 180 | case SOCK_RDM: |
0c3141e9 AS |
181 | ops = &msg_ops; |
182 | state = SS_READY; | |
b97bf3fd | 183 | break; |
49978651 | 184 | default: |
49978651 | 185 | return -EPROTOTYPE; |
b97bf3fd PL |
186 | } |
187 | ||
0c3141e9 | 188 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
189 | if (!kern) |
190 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
191 | else | |
192 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
193 | ||
0c3141e9 | 194 | if (sk == NULL) |
b97bf3fd | 195 | return -ENOMEM; |
b97bf3fd | 196 | |
0c3141e9 | 197 | /* Allocate TIPC port for socket to use */ |
3c5db8e4 YX |
198 | tp_ptr = tipc_createport(sk, &dispatch, &wakeupdispatch, |
199 | TIPC_LOW_IMPORTANCE); | |
0ea52241 | 200 | if (unlikely(!tp_ptr)) { |
0c3141e9 AS |
201 | sk_free(sk); |
202 | return -ENOMEM; | |
203 | } | |
b97bf3fd | 204 | |
0c3141e9 | 205 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
206 | sock->ops = ops; |
207 | sock->state = state; | |
b97bf3fd | 208 | |
0c3141e9 | 209 | sock_init_data(sock, sk); |
0c3141e9 | 210 | sk->sk_backlog_rcv = backlog_rcv; |
cc79dd1b | 211 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
212 | sk->sk_data_ready = tipc_data_ready; |
213 | sk->sk_write_space = tipc_write_space; | |
0ea52241 | 214 | tipc_sk(sk)->p = tp_ptr; |
a0f40f02 | 215 | tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT; |
b97bf3fd | 216 | |
7ef43eba AS |
217 | spin_unlock_bh(tp_ptr->lock); |
218 | ||
0c3141e9 | 219 | if (sock->state == SS_READY) { |
0ea52241 | 220 | tipc_set_portunreturnable(tp_ptr->ref, 1); |
0c3141e9 | 221 | if (sock->type == SOCK_DGRAM) |
0ea52241 | 222 | tipc_set_portunreliable(tp_ptr->ref, 1); |
0c3141e9 | 223 | } |
b97bf3fd PL |
224 | |
225 | return 0; | |
226 | } | |
227 | ||
c5fa7b3c YX |
228 | /** |
229 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
230 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
231 | * | |
232 | * We cannot use sock_creat_kern here because it bumps module user count. | |
233 | * Since socket owner and creator is the same module we must make sure | |
234 | * that module count remains zero for module local sockets, otherwise | |
235 | * we cannot do rmmod. | |
236 | * | |
237 | * Returns 0 on success, errno otherwise | |
238 | */ | |
239 | int tipc_sock_create_local(int type, struct socket **res) | |
240 | { | |
241 | int rc; | |
242 | struct sock *sk; | |
243 | ||
244 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
245 | if (rc < 0) { | |
246 | pr_err("Failed to create kernel socket\n"); | |
247 | return rc; | |
248 | } | |
249 | tipc_sk_create(&init_net, *res, 0, 1); | |
250 | ||
251 | sk = (*res)->sk; | |
252 | ||
253 | return 0; | |
254 | } | |
255 | ||
256 | /** | |
257 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
258 | * @sock: the socket to be released. | |
259 | * | |
260 | * Module reference count is not incremented when such sockets are created, | |
261 | * so we must keep it from being decremented when they are released. | |
262 | */ | |
263 | void tipc_sock_release_local(struct socket *sock) | |
264 | { | |
265 | release(sock); | |
266 | sock->ops = NULL; | |
267 | sock_release(sock); | |
268 | } | |
269 | ||
270 | /** | |
271 | * tipc_sock_accept_local - accept a connection on a socket created | |
272 | * with tipc_sock_create_local. Use this function to avoid that | |
273 | * module reference count is inadvertently incremented. | |
274 | * | |
275 | * @sock: the accepting socket | |
276 | * @newsock: reference to the new socket to be created | |
277 | * @flags: socket flags | |
278 | */ | |
279 | ||
280 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 281 | int flags) |
c5fa7b3c YX |
282 | { |
283 | struct sock *sk = sock->sk; | |
284 | int ret; | |
285 | ||
286 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
287 | sk->sk_protocol, newsock); | |
288 | if (ret < 0) | |
289 | return ret; | |
290 | ||
291 | ret = accept(sock, *newsock, flags); | |
292 | if (ret < 0) { | |
293 | sock_release(*newsock); | |
294 | return ret; | |
295 | } | |
296 | (*newsock)->ops = sock->ops; | |
297 | return ret; | |
298 | } | |
299 | ||
b97bf3fd PL |
300 | /** |
301 | * release - destroy a TIPC socket | |
302 | * @sock: socket to destroy | |
303 | * | |
304 | * This routine cleans up any messages that are still queued on the socket. | |
305 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
306 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
307 | * and any others are discarded. (If the first message on a STREAM socket | |
308 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 309 | * |
b97bf3fd PL |
310 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
311 | * are returned or discarded according to the "destination droppable" setting | |
312 | * specified for the message by the sender. | |
313 | * | |
314 | * Returns 0 on success, errno otherwise | |
315 | */ | |
b97bf3fd PL |
316 | static int release(struct socket *sock) |
317 | { | |
b97bf3fd | 318 | struct sock *sk = sock->sk; |
0c3141e9 | 319 | struct tipc_port *tport; |
b97bf3fd | 320 | struct sk_buff *buf; |
0c3141e9 | 321 | int res; |
b97bf3fd | 322 | |
0c3141e9 AS |
323 | /* |
324 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
325 | * releases a pre-allocated child socket that was never used) | |
326 | */ | |
0c3141e9 | 327 | if (sk == NULL) |
b97bf3fd | 328 | return 0; |
c4307285 | 329 | |
0c3141e9 AS |
330 | tport = tipc_sk_port(sk); |
331 | lock_sock(sk); | |
332 | ||
333 | /* | |
334 | * Reject all unreceived messages, except on an active connection | |
335 | * (which disconnects locally & sends a 'FIN+' to peer) | |
336 | */ | |
b97bf3fd | 337 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
338 | buf = __skb_dequeue(&sk->sk_receive_queue); |
339 | if (buf == NULL) | |
b97bf3fd | 340 | break; |
40682432 | 341 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 342 | kfree_skb(buf); |
0c3141e9 AS |
343 | else { |
344 | if ((sock->state == SS_CONNECTING) || | |
345 | (sock->state == SS_CONNECTED)) { | |
346 | sock->state = SS_DISCONNECTING; | |
347 | tipc_disconnect(tport->ref); | |
348 | } | |
b97bf3fd | 349 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 350 | } |
b97bf3fd PL |
351 | } |
352 | ||
0c3141e9 AS |
353 | /* |
354 | * Delete TIPC port; this ensures no more messages are queued | |
355 | * (also disconnects an active connection & sends a 'FIN-' to peer) | |
356 | */ | |
0c3141e9 | 357 | res = tipc_deleteport(tport->ref); |
b97bf3fd | 358 | |
0c3141e9 | 359 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 360 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 361 | |
0c3141e9 | 362 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
363 | sock->state = SS_DISCONNECTING; |
364 | release_sock(sk); | |
b97bf3fd PL |
365 | |
366 | sock_put(sk); | |
0c3141e9 | 367 | sock->sk = NULL; |
b97bf3fd | 368 | |
b97bf3fd PL |
369 | return res; |
370 | } | |
371 | ||
372 | /** | |
373 | * bind - associate or disassocate TIPC name(s) with a socket | |
374 | * @sock: socket structure | |
375 | * @uaddr: socket address describing name(s) and desired operation | |
376 | * @uaddr_len: size of socket address data structure | |
c4307285 | 377 | * |
b97bf3fd PL |
378 | * Name and name sequence binding is indicated using a positive scope value; |
379 | * a negative scope value unbinds the specified name. Specifying no name | |
380 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 381 | * |
b97bf3fd | 382 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
383 | * |
384 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
385 | * access any non-constant socket information. | |
b97bf3fd | 386 | */ |
b97bf3fd PL |
387 | static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) |
388 | { | |
b97bf3fd | 389 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
0c3141e9 | 390 | u32 portref = tipc_sk_port(sock->sk)->ref; |
b97bf3fd | 391 | |
0c3141e9 AS |
392 | if (unlikely(!uaddr_len)) |
393 | return tipc_withdraw(portref, 0, NULL); | |
c4307285 | 394 | |
0c3141e9 AS |
395 | if (uaddr_len < sizeof(struct sockaddr_tipc)) |
396 | return -EINVAL; | |
397 | if (addr->family != AF_TIPC) | |
398 | return -EAFNOSUPPORT; | |
b97bf3fd | 399 | |
b97bf3fd PL |
400 | if (addr->addrtype == TIPC_ADDR_NAME) |
401 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
0c3141e9 AS |
402 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) |
403 | return -EAFNOSUPPORT; | |
c4307285 | 404 | |
13a2e898 | 405 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b YX |
406 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
407 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) | |
c422f1bd AS |
408 | return -EACCES; |
409 | ||
0c3141e9 AS |
410 | return (addr->scope > 0) ? |
411 | tipc_publish(portref, addr->scope, &addr->addr.nameseq) : | |
412 | tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq); | |
b97bf3fd PL |
413 | } |
414 | ||
c4307285 | 415 | /** |
b97bf3fd PL |
416 | * get_name - get port ID of socket or peer socket |
417 | * @sock: socket structure | |
418 | * @uaddr: area for returned socket address | |
419 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 420 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 421 | * |
b97bf3fd | 422 | * Returns 0 on success, errno otherwise |
0c3141e9 | 423 | * |
2da59918 AS |
424 | * NOTE: This routine doesn't need to take the socket lock since it only |
425 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 426 | * a completely predictable manner). |
b97bf3fd | 427 | */ |
c4307285 | 428 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
429 | int *uaddr_len, int peer) |
430 | { | |
b97bf3fd | 431 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
2da59918 | 432 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd | 433 | |
88f8a5e3 | 434 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 435 | if (peer) { |
2da59918 AS |
436 | if ((sock->state != SS_CONNECTED) && |
437 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
438 | return -ENOTCONN; | |
439 | addr->addr.id.ref = tsock->peer_name.ref; | |
440 | addr->addr.id.node = tsock->peer_name.node; | |
0c3141e9 | 441 | } else { |
b924dcf0 AS |
442 | addr->addr.id.ref = tsock->p->ref; |
443 | addr->addr.id.node = tipc_own_addr; | |
0c3141e9 | 444 | } |
b97bf3fd PL |
445 | |
446 | *uaddr_len = sizeof(*addr); | |
447 | addr->addrtype = TIPC_ADDR_ID; | |
448 | addr->family = AF_TIPC; | |
449 | addr->scope = 0; | |
b97bf3fd PL |
450 | addr->addr.name.domain = 0; |
451 | ||
0c3141e9 | 452 | return 0; |
b97bf3fd PL |
453 | } |
454 | ||
455 | /** | |
456 | * poll - read and possibly block on pollmask | |
457 | * @file: file structure associated with the socket | |
458 | * @sock: socket for which to calculate the poll bits | |
459 | * @wait: ??? | |
460 | * | |
9b674e82 AS |
461 | * Returns pollmask value |
462 | * | |
463 | * COMMENTARY: | |
464 | * It appears that the usual socket locking mechanisms are not useful here | |
465 | * since the pollmask info is potentially out-of-date the moment this routine | |
466 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
467 | * to handle any preventable race conditions, so TIPC will do the same ... | |
468 | * | |
469 | * TIPC sets the returned events as follows: | |
f662c070 AS |
470 | * |
471 | * socket state flags set | |
472 | * ------------ --------- | |
473 | * unconnected no read flags | |
c4fc298a | 474 | * POLLOUT if port is not congested |
f662c070 AS |
475 | * |
476 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
477 | * no write flags | |
478 | * | |
479 | * connected POLLIN/POLLRDNORM if data in rx queue | |
480 | * POLLOUT if port is not congested | |
481 | * | |
482 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
483 | * no write flags | |
484 | * | |
485 | * listening POLLIN if SYN in rx queue | |
486 | * no write flags | |
487 | * | |
488 | * ready POLLIN/POLLRDNORM if data in rx queue | |
489 | * [connectionless] POLLOUT (since port cannot be congested) | |
490 | * | |
491 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
492 | * imply that the operation will succeed, merely that it should be performed | |
493 | * and will not block. | |
b97bf3fd | 494 | */ |
c4307285 | 495 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
496 | poll_table *wait) |
497 | { | |
9b674e82 | 498 | struct sock *sk = sock->sk; |
f662c070 | 499 | u32 mask = 0; |
9b674e82 | 500 | |
f288bef4 | 501 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 502 | |
f662c070 | 503 | switch ((int)sock->state) { |
c4fc298a EH |
504 | case SS_UNCONNECTED: |
505 | if (!tipc_sk_port(sk)->congested) | |
506 | mask |= POLLOUT; | |
507 | break; | |
f662c070 AS |
508 | case SS_READY: |
509 | case SS_CONNECTED: | |
510 | if (!tipc_sk_port(sk)->congested) | |
511 | mask |= POLLOUT; | |
512 | /* fall thru' */ | |
513 | case SS_CONNECTING: | |
514 | case SS_LISTENING: | |
515 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
516 | mask |= (POLLIN | POLLRDNORM); | |
517 | break; | |
518 | case SS_DISCONNECTING: | |
519 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
520 | break; | |
521 | } | |
9b674e82 AS |
522 | |
523 | return mask; | |
b97bf3fd PL |
524 | } |
525 | ||
c4307285 | 526 | /** |
b97bf3fd PL |
527 | * dest_name_check - verify user is permitted to send to specified port name |
528 | * @dest: destination address | |
529 | * @m: descriptor for message to be sent | |
c4307285 | 530 | * |
b97bf3fd PL |
531 | * Prevents restricted configuration commands from being issued by |
532 | * unauthorized users. | |
c4307285 | 533 | * |
b97bf3fd PL |
534 | * Returns 0 if permission is granted, otherwise errno |
535 | */ | |
05790c64 | 536 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
537 | { |
538 | struct tipc_cfg_msg_hdr hdr; | |
539 | ||
c4307285 YH |
540 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
541 | return 0; | |
542 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
543 | return 0; | |
c4307285 YH |
544 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
545 | return -EACCES; | |
b97bf3fd | 546 | |
3f8dd944 AS |
547 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
548 | return -EMSGSIZE; | |
c4307285 | 549 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 550 | return -EFAULT; |
70cb2347 | 551 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 552 | return -EACCES; |
c4307285 | 553 | |
b97bf3fd PL |
554 | return 0; |
555 | } | |
556 | ||
557 | /** | |
558 | * send_msg - send message in connectionless manner | |
0c3141e9 | 559 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
560 | * @sock: socket structure |
561 | * @m: message to send | |
e9024f0f | 562 | * @total_len: length of message |
c4307285 | 563 | * |
b97bf3fd | 564 | * Message must have an destination specified explicitly. |
c4307285 | 565 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
566 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
567 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 568 | * |
b97bf3fd PL |
569 | * Returns the number of bytes sent on success, or errno otherwise |
570 | */ | |
b97bf3fd PL |
571 | static int send_msg(struct kiocb *iocb, struct socket *sock, |
572 | struct msghdr *m, size_t total_len) | |
573 | { | |
0c3141e9 AS |
574 | struct sock *sk = sock->sk; |
575 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 576 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 577 | int needs_conn; |
1d835874 | 578 | long timeout_val; |
b97bf3fd PL |
579 | int res = -EINVAL; |
580 | ||
581 | if (unlikely(!dest)) | |
582 | return -EDESTADDRREQ; | |
51f9cc1f AS |
583 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
584 | (dest->family != AF_TIPC))) | |
b97bf3fd | 585 | return -EINVAL; |
97f8b87e | 586 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 | 587 | return -EMSGSIZE; |
b97bf3fd | 588 | |
0c3141e9 AS |
589 | if (iocb) |
590 | lock_sock(sk); | |
591 | ||
b97bf3fd PL |
592 | needs_conn = (sock->state != SS_READY); |
593 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
594 | if (sock->state == SS_LISTENING) { |
595 | res = -EPIPE; | |
596 | goto exit; | |
597 | } | |
598 | if (sock->state != SS_UNCONNECTED) { | |
599 | res = -EISCONN; | |
600 | goto exit; | |
601 | } | |
5d21cb70 | 602 | if (tport->published) { |
0c3141e9 AS |
603 | res = -EOPNOTSUPP; |
604 | goto exit; | |
605 | } | |
3388007b | 606 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
607 | tport->conn_type = dest->addr.name.name.type; |
608 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 609 | } |
b97bf3fd PL |
610 | |
611 | /* Abort any pending connection attempts (very unlikely) */ | |
0c3141e9 | 612 | reject_rx_queue(sk); |
b97bf3fd PL |
613 | } |
614 | ||
1d835874 YX |
615 | timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
616 | ||
c4307285 YH |
617 | do { |
618 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
619 | res = dest_name_check(dest, m); |
620 | if (res) | |
0c3141e9 AS |
621 | break; |
622 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
623 | &dest->addr.name.name, |
624 | dest->addr.name.domain, | |
26896904 AS |
625 | m->msg_iov, |
626 | total_len); | |
0e65967e | 627 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
0c3141e9 | 628 | res = tipc_send2port(tport->ref, |
c4307285 | 629 | &dest->addr.id, |
26896904 AS |
630 | m->msg_iov, |
631 | total_len); | |
0e65967e | 632 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
633 | if (needs_conn) { |
634 | res = -EOPNOTSUPP; | |
0c3141e9 | 635 | break; |
b97bf3fd | 636 | } |
2db9983a AS |
637 | res = dest_name_check(dest, m); |
638 | if (res) | |
0c3141e9 AS |
639 | break; |
640 | res = tipc_multicast(tport->ref, | |
c4307285 | 641 | &dest->addr.nameseq, |
26896904 AS |
642 | m->msg_iov, |
643 | total_len); | |
c4307285 YH |
644 | } |
645 | if (likely(res != -ELINKCONG)) { | |
a016892c | 646 | if (needs_conn && (res >= 0)) |
0c3141e9 | 647 | sock->state = SS_CONNECTING; |
0c3141e9 | 648 | break; |
c4307285 | 649 | } |
1d835874 YX |
650 | if (timeout_val <= 0L) { |
651 | res = timeout_val ? timeout_val : -EWOULDBLOCK; | |
0c3141e9 | 652 | break; |
c4307285 | 653 | } |
0c3141e9 | 654 | release_sock(sk); |
1d835874 YX |
655 | timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), |
656 | !tport->congested, timeout_val); | |
0c3141e9 | 657 | lock_sock(sk); |
c4307285 | 658 | } while (1); |
0c3141e9 AS |
659 | |
660 | exit: | |
661 | if (iocb) | |
662 | release_sock(sk); | |
663 | return res; | |
b97bf3fd PL |
664 | } |
665 | ||
c4307285 | 666 | /** |
b97bf3fd | 667 | * send_packet - send a connection-oriented message |
0c3141e9 | 668 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
669 | * @sock: socket structure |
670 | * @m: message to send | |
e9024f0f | 671 | * @total_len: length of message |
c4307285 | 672 | * |
b97bf3fd | 673 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 674 | * |
b97bf3fd PL |
675 | * Returns the number of bytes sent on success, or errno otherwise |
676 | */ | |
b97bf3fd PL |
677 | static int send_packet(struct kiocb *iocb, struct socket *sock, |
678 | struct msghdr *m, size_t total_len) | |
679 | { | |
0c3141e9 AS |
680 | struct sock *sk = sock->sk; |
681 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 682 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
1d835874 | 683 | long timeout_val; |
b97bf3fd PL |
684 | int res; |
685 | ||
686 | /* Handle implied connection establishment */ | |
b97bf3fd PL |
687 | if (unlikely(dest)) |
688 | return send_msg(iocb, sock, m, total_len); | |
689 | ||
97f8b87e | 690 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 AS |
691 | return -EMSGSIZE; |
692 | ||
0c3141e9 AS |
693 | if (iocb) |
694 | lock_sock(sk); | |
b97bf3fd | 695 | |
1d835874 YX |
696 | timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
697 | ||
c4307285 | 698 | do { |
bdd94789 AS |
699 | if (unlikely(sock->state != SS_CONNECTED)) { |
700 | if (sock->state == SS_DISCONNECTING) | |
c4307285 | 701 | res = -EPIPE; |
bdd94789 AS |
702 | else |
703 | res = -ENOTCONN; | |
0c3141e9 | 704 | break; |
bdd94789 AS |
705 | } |
706 | ||
9446b87a | 707 | res = tipc_send(tport->ref, m->msg_iov, total_len); |
a016892c | 708 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 709 | break; |
1d835874 YX |
710 | if (timeout_val <= 0L) { |
711 | res = timeout_val ? timeout_val : -EWOULDBLOCK; | |
0c3141e9 | 712 | break; |
c4307285 | 713 | } |
0c3141e9 | 714 | release_sock(sk); |
1d835874 YX |
715 | timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk), |
716 | (!tport->congested || !tport->connected), timeout_val); | |
0c3141e9 | 717 | lock_sock(sk); |
c4307285 | 718 | } while (1); |
0c3141e9 AS |
719 | |
720 | if (iocb) | |
721 | release_sock(sk); | |
722 | return res; | |
b97bf3fd PL |
723 | } |
724 | ||
c4307285 | 725 | /** |
b97bf3fd PL |
726 | * send_stream - send stream-oriented data |
727 | * @iocb: (unused) | |
728 | * @sock: socket structure | |
729 | * @m: data to send | |
730 | * @total_len: total length of data to be sent | |
c4307285 | 731 | * |
b97bf3fd | 732 | * Used for SOCK_STREAM data. |
c4307285 YH |
733 | * |
734 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 735 | * or errno if no data sent |
b97bf3fd | 736 | */ |
b97bf3fd PL |
737 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
738 | struct msghdr *m, size_t total_len) | |
739 | { | |
0c3141e9 AS |
740 | struct sock *sk = sock->sk; |
741 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
742 | struct msghdr my_msg; |
743 | struct iovec my_iov; | |
744 | struct iovec *curr_iov; | |
745 | int curr_iovlen; | |
746 | char __user *curr_start; | |
05646c91 | 747 | u32 hdr_size; |
b97bf3fd PL |
748 | int curr_left; |
749 | int bytes_to_send; | |
1303e8f1 | 750 | int bytes_sent; |
b97bf3fd | 751 | int res; |
c4307285 | 752 | |
0c3141e9 AS |
753 | lock_sock(sk); |
754 | ||
05646c91 | 755 | /* Handle special cases where there is no connection */ |
c4307285 | 756 | if (unlikely(sock->state != SS_CONNECTED)) { |
0c3141e9 AS |
757 | if (sock->state == SS_UNCONNECTED) { |
758 | res = send_packet(NULL, sock, m, total_len); | |
759 | goto exit; | |
760 | } else if (sock->state == SS_DISCONNECTING) { | |
761 | res = -EPIPE; | |
762 | goto exit; | |
763 | } else { | |
764 | res = -ENOTCONN; | |
765 | goto exit; | |
766 | } | |
c4307285 | 767 | } |
b97bf3fd | 768 | |
0c3141e9 AS |
769 | if (unlikely(m->msg_name)) { |
770 | res = -EISCONN; | |
771 | goto exit; | |
772 | } | |
eb5959c2 | 773 | |
97f8b87e | 774 | if (total_len > (unsigned int)INT_MAX) { |
c29c3f70 AS |
775 | res = -EMSGSIZE; |
776 | goto exit; | |
777 | } | |
778 | ||
c4307285 | 779 | /* |
b97bf3fd PL |
780 | * Send each iovec entry using one or more messages |
781 | * | |
c4307285 | 782 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
783 | * (i.e. one large iovec entry), but could be improved to pass sets |
784 | * of small iovec entries into send_packet(). | |
785 | */ | |
1303e8f1 AS |
786 | curr_iov = m->msg_iov; |
787 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
788 | my_msg.msg_iov = &my_iov; |
789 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
790 | my_msg.msg_flags = m->msg_flags; |
791 | my_msg.msg_name = NULL; | |
1303e8f1 | 792 | bytes_sent = 0; |
b97bf3fd | 793 | |
05646c91 AS |
794 | hdr_size = msg_hdr_sz(&tport->phdr); |
795 | ||
b97bf3fd PL |
796 | while (curr_iovlen--) { |
797 | curr_start = curr_iov->iov_base; | |
798 | curr_left = curr_iov->iov_len; | |
799 | ||
800 | while (curr_left) { | |
05646c91 AS |
801 | bytes_to_send = tport->max_pkt - hdr_size; |
802 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) | |
803 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
804 | if (curr_left < bytes_to_send) | |
805 | bytes_to_send = curr_left; | |
b97bf3fd PL |
806 | my_iov.iov_base = curr_start; |
807 | my_iov.iov_len = bytes_to_send; | |
26896904 | 808 | res = send_packet(NULL, sock, &my_msg, bytes_to_send); |
2db9983a | 809 | if (res < 0) { |
0c3141e9 | 810 | if (bytes_sent) |
05646c91 | 811 | res = bytes_sent; |
0c3141e9 | 812 | goto exit; |
1303e8f1 | 813 | } |
b97bf3fd PL |
814 | curr_left -= bytes_to_send; |
815 | curr_start += bytes_to_send; | |
1303e8f1 | 816 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
817 | } |
818 | ||
819 | curr_iov++; | |
820 | } | |
0c3141e9 AS |
821 | res = bytes_sent; |
822 | exit: | |
823 | release_sock(sk); | |
824 | return res; | |
b97bf3fd PL |
825 | } |
826 | ||
827 | /** | |
828 | * auto_connect - complete connection setup to a remote port | |
829 | * @sock: socket structure | |
b97bf3fd | 830 | * @msg: peer's response message |
c4307285 | 831 | * |
b97bf3fd PL |
832 | * Returns 0 on success, errno otherwise |
833 | */ | |
0c3141e9 | 834 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 835 | { |
2da59918 | 836 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
584d24b3 | 837 | struct tipc_port *p_ptr; |
b97bf3fd | 838 | |
2da59918 AS |
839 | tsock->peer_name.ref = msg_origport(msg); |
840 | tsock->peer_name.node = msg_orignode(msg); | |
584d24b3 YX |
841 | p_ptr = tipc_port_deref(tsock->p->ref); |
842 | if (!p_ptr) | |
843 | return -EINVAL; | |
844 | ||
845 | __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name); | |
846 | ||
847 | if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) | |
848 | return -EINVAL; | |
849 | msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg)); | |
b97bf3fd PL |
850 | sock->state = SS_CONNECTED; |
851 | return 0; | |
852 | } | |
853 | ||
854 | /** | |
855 | * set_orig_addr - capture sender's address for received message | |
856 | * @m: descriptor for message info | |
857 | * @msg: received message header | |
c4307285 | 858 | * |
b97bf3fd PL |
859 | * Note: Address is not captured if not requested by receiver. |
860 | */ | |
05790c64 | 861 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 862 | { |
c4307285 | 863 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 864 | |
c4307285 | 865 | if (addr) { |
b97bf3fd PL |
866 | addr->family = AF_TIPC; |
867 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 868 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
869 | addr->addr.id.ref = msg_origport(msg); |
870 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
871 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
872 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
873 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
874 | } | |
875 | } | |
876 | ||
877 | /** | |
c4307285 | 878 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
879 | * @m: descriptor for message info |
880 | * @msg: received message header | |
881 | * @tport: TIPC port associated with message | |
c4307285 | 882 | * |
b97bf3fd | 883 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 884 | * |
b97bf3fd PL |
885 | * Returns 0 if successful, otherwise errno |
886 | */ | |
05790c64 | 887 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
ae8509c4 | 888 | struct tipc_port *tport) |
b97bf3fd PL |
889 | { |
890 | u32 anc_data[3]; | |
891 | u32 err; | |
892 | u32 dest_type; | |
3546c750 | 893 | int has_name; |
b97bf3fd PL |
894 | int res; |
895 | ||
896 | if (likely(m->msg_controllen == 0)) | |
897 | return 0; | |
898 | ||
899 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
900 | err = msg ? msg_errcode(msg) : 0; |
901 | if (unlikely(err)) { | |
902 | anc_data[0] = err; | |
903 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
904 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
905 | if (res) | |
b97bf3fd | 906 | return res; |
2db9983a AS |
907 | if (anc_data[1]) { |
908 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
909 | msg_data(msg)); | |
910 | if (res) | |
911 | return res; | |
912 | } | |
b97bf3fd PL |
913 | } |
914 | ||
915 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
916 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
917 | switch (dest_type) { | |
918 | case TIPC_NAMED_MSG: | |
3546c750 | 919 | has_name = 1; |
b97bf3fd PL |
920 | anc_data[0] = msg_nametype(msg); |
921 | anc_data[1] = msg_namelower(msg); | |
922 | anc_data[2] = msg_namelower(msg); | |
923 | break; | |
924 | case TIPC_MCAST_MSG: | |
3546c750 | 925 | has_name = 1; |
b97bf3fd PL |
926 | anc_data[0] = msg_nametype(msg); |
927 | anc_data[1] = msg_namelower(msg); | |
928 | anc_data[2] = msg_nameupper(msg); | |
929 | break; | |
930 | case TIPC_CONN_MSG: | |
3546c750 | 931 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
932 | anc_data[0] = tport->conn_type; |
933 | anc_data[1] = tport->conn_instance; | |
934 | anc_data[2] = tport->conn_instance; | |
935 | break; | |
936 | default: | |
3546c750 | 937 | has_name = 0; |
b97bf3fd | 938 | } |
2db9983a AS |
939 | if (has_name) { |
940 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
941 | if (res) | |
942 | return res; | |
943 | } | |
b97bf3fd PL |
944 | |
945 | return 0; | |
946 | } | |
947 | ||
c4307285 | 948 | /** |
b97bf3fd PL |
949 | * recv_msg - receive packet-oriented message |
950 | * @iocb: (unused) | |
951 | * @m: descriptor for message info | |
952 | * @buf_len: total size of user buffer area | |
953 | * @flags: receive flags | |
c4307285 | 954 | * |
b97bf3fd PL |
955 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
956 | * If the complete message doesn't fit in user area, truncate it. | |
957 | * | |
958 | * Returns size of returned message data, errno otherwise | |
959 | */ | |
b97bf3fd PL |
960 | static int recv_msg(struct kiocb *iocb, struct socket *sock, |
961 | struct msghdr *m, size_t buf_len, int flags) | |
962 | { | |
0c3141e9 AS |
963 | struct sock *sk = sock->sk; |
964 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
965 | struct sk_buff *buf; |
966 | struct tipc_msg *msg; | |
71092ea1 | 967 | long timeout; |
b97bf3fd PL |
968 | unsigned int sz; |
969 | u32 err; | |
970 | int res; | |
971 | ||
0c3141e9 | 972 | /* Catch invalid receive requests */ |
b97bf3fd PL |
973 | if (unlikely(!buf_len)) |
974 | return -EINVAL; | |
975 | ||
0c3141e9 | 976 | lock_sock(sk); |
b97bf3fd | 977 | |
0c3141e9 AS |
978 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
979 | res = -ENOTCONN; | |
b97bf3fd PL |
980 | goto exit; |
981 | } | |
982 | ||
71092ea1 | 983 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 984 | restart: |
b97bf3fd | 985 | |
0c3141e9 | 986 | /* Look for a message in receive queue; wait if necessary */ |
0c3141e9 AS |
987 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
988 | if (sock->state == SS_DISCONNECTING) { | |
989 | res = -ENOTCONN; | |
990 | goto exit; | |
991 | } | |
71092ea1 AS |
992 | if (timeout <= 0L) { |
993 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
994 | goto exit; |
995 | } | |
996 | release_sock(sk); | |
71092ea1 AS |
997 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
998 | tipc_rx_ready(sock), | |
999 | timeout); | |
0c3141e9 | 1000 | lock_sock(sk); |
b97bf3fd PL |
1001 | } |
1002 | ||
0c3141e9 | 1003 | /* Look at first message in receive queue */ |
0c3141e9 | 1004 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1005 | msg = buf_msg(buf); |
1006 | sz = msg_data_sz(msg); | |
1007 | err = msg_errcode(msg); | |
1008 | ||
b97bf3fd | 1009 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1010 | if ((!sz) && (!err)) { |
0c3141e9 | 1011 | advance_rx_queue(sk); |
b97bf3fd PL |
1012 | goto restart; |
1013 | } | |
1014 | ||
1015 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1016 | set_orig_addr(m, msg); |
1017 | ||
1018 | /* Capture ancillary data (optional) */ | |
0c3141e9 AS |
1019 | res = anc_data_recv(m, msg, tport); |
1020 | if (res) | |
b97bf3fd PL |
1021 | goto exit; |
1022 | ||
1023 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1024 | if (!err) { |
1025 | if (unlikely(buf_len < sz)) { | |
1026 | sz = buf_len; | |
1027 | m->msg_flags |= MSG_TRUNC; | |
1028 | } | |
0232fd0a AS |
1029 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1030 | m->msg_iov, sz); | |
1031 | if (res) | |
b97bf3fd | 1032 | goto exit; |
b97bf3fd PL |
1033 | res = sz; |
1034 | } else { | |
1035 | if ((sock->state == SS_READY) || | |
1036 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1037 | res = 0; | |
1038 | else | |
1039 | res = -ECONNRESET; | |
1040 | } | |
1041 | ||
1042 | /* Consume received message (optional) */ | |
b97bf3fd | 1043 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1044 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
1045 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1046 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1047 | advance_rx_queue(sk); | |
c4307285 | 1048 | } |
b97bf3fd | 1049 | exit: |
0c3141e9 | 1050 | release_sock(sk); |
b97bf3fd PL |
1051 | return res; |
1052 | } | |
1053 | ||
c4307285 | 1054 | /** |
b97bf3fd PL |
1055 | * recv_stream - receive stream-oriented data |
1056 | * @iocb: (unused) | |
1057 | * @m: descriptor for message info | |
1058 | * @buf_len: total size of user buffer area | |
1059 | * @flags: receive flags | |
c4307285 YH |
1060 | * |
1061 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1062 | * will optionally wait for more; never truncates data. |
1063 | * | |
1064 | * Returns size of returned message data, errno otherwise | |
1065 | */ | |
b97bf3fd PL |
1066 | static int recv_stream(struct kiocb *iocb, struct socket *sock, |
1067 | struct msghdr *m, size_t buf_len, int flags) | |
1068 | { | |
0c3141e9 AS |
1069 | struct sock *sk = sock->sk; |
1070 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1071 | struct sk_buff *buf; |
1072 | struct tipc_msg *msg; | |
71092ea1 | 1073 | long timeout; |
b97bf3fd | 1074 | unsigned int sz; |
3720d40b | 1075 | int sz_to_copy, target, needed; |
b97bf3fd | 1076 | int sz_copied = 0; |
b97bf3fd | 1077 | u32 err; |
0c3141e9 | 1078 | int res = 0; |
b97bf3fd | 1079 | |
0c3141e9 | 1080 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1081 | if (unlikely(!buf_len)) |
1082 | return -EINVAL; | |
1083 | ||
0c3141e9 | 1084 | lock_sock(sk); |
b97bf3fd | 1085 | |
5d21cb70 | 1086 | if (unlikely((sock->state == SS_UNCONNECTED))) { |
0c3141e9 | 1087 | res = -ENOTCONN; |
b97bf3fd PL |
1088 | goto exit; |
1089 | } | |
1090 | ||
3720d40b | 1091 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
71092ea1 | 1092 | timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1093 | |
617d3c7a | 1094 | restart: |
0c3141e9 | 1095 | /* Look for a message in receive queue; wait if necessary */ |
0c3141e9 AS |
1096 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1097 | if (sock->state == SS_DISCONNECTING) { | |
1098 | res = -ENOTCONN; | |
1099 | goto exit; | |
1100 | } | |
71092ea1 AS |
1101 | if (timeout <= 0L) { |
1102 | res = timeout ? timeout : -EWOULDBLOCK; | |
0c3141e9 AS |
1103 | goto exit; |
1104 | } | |
1105 | release_sock(sk); | |
71092ea1 AS |
1106 | timeout = wait_event_interruptible_timeout(*sk_sleep(sk), |
1107 | tipc_rx_ready(sock), | |
1108 | timeout); | |
0c3141e9 | 1109 | lock_sock(sk); |
b97bf3fd PL |
1110 | } |
1111 | ||
0c3141e9 | 1112 | /* Look at first message in receive queue */ |
0c3141e9 | 1113 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1114 | msg = buf_msg(buf); |
1115 | sz = msg_data_sz(msg); | |
1116 | err = msg_errcode(msg); | |
1117 | ||
1118 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1119 | if ((!sz) && (!err)) { |
0c3141e9 | 1120 | advance_rx_queue(sk); |
b97bf3fd PL |
1121 | goto restart; |
1122 | } | |
1123 | ||
1124 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1125 | if (sz_copied == 0) { |
1126 | set_orig_addr(m, msg); | |
0c3141e9 AS |
1127 | res = anc_data_recv(m, msg, tport); |
1128 | if (res) | |
b97bf3fd PL |
1129 | goto exit; |
1130 | } | |
1131 | ||
1132 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1133 | if (!err) { |
0232fd0a | 1134 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1135 | |
0232fd0a | 1136 | sz -= offset; |
b97bf3fd PL |
1137 | needed = (buf_len - sz_copied); |
1138 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1139 | |
1140 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1141 | m->msg_iov, sz_to_copy); | |
1142 | if (res) | |
b97bf3fd | 1143 | goto exit; |
0232fd0a | 1144 | |
b97bf3fd PL |
1145 | sz_copied += sz_to_copy; |
1146 | ||
1147 | if (sz_to_copy < sz) { | |
1148 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1149 | TIPC_SKB_CB(buf)->handle = |
1150 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1151 | goto exit; |
1152 | } | |
b97bf3fd PL |
1153 | } else { |
1154 | if (sz_copied != 0) | |
1155 | goto exit; /* can't add error msg to valid data */ | |
1156 | ||
1157 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1158 | res = 0; | |
1159 | else | |
1160 | res = -ECONNRESET; | |
1161 | } | |
1162 | ||
1163 | /* Consume received message (optional) */ | |
b97bf3fd | 1164 | if (likely(!(flags & MSG_PEEK))) { |
0c3141e9 AS |
1165 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1166 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1167 | advance_rx_queue(sk); | |
c4307285 | 1168 | } |
b97bf3fd PL |
1169 | |
1170 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1171 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1172 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1173 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1174 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1175 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1176 | goto restart; |
1177 | ||
1178 | exit: | |
0c3141e9 | 1179 | release_sock(sk); |
a3b0a5a9 | 1180 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1181 | } |
1182 | ||
f288bef4 YX |
1183 | /** |
1184 | * tipc_write_space - wake up thread if port congestion is released | |
1185 | * @sk: socket | |
1186 | */ | |
1187 | static void tipc_write_space(struct sock *sk) | |
1188 | { | |
1189 | struct socket_wq *wq; | |
1190 | ||
1191 | rcu_read_lock(); | |
1192 | wq = rcu_dereference(sk->sk_wq); | |
1193 | if (wq_has_sleeper(wq)) | |
1194 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1195 | POLLWRNORM | POLLWRBAND); | |
1196 | rcu_read_unlock(); | |
1197 | } | |
1198 | ||
1199 | /** | |
1200 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1201 | * @sk: socket | |
1202 | * @len: the length of messages | |
1203 | */ | |
1204 | static void tipc_data_ready(struct sock *sk, int len) | |
1205 | { | |
1206 | struct socket_wq *wq; | |
1207 | ||
1208 | rcu_read_lock(); | |
1209 | wq = rcu_dereference(sk->sk_wq); | |
1210 | if (wq_has_sleeper(wq)) | |
1211 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1212 | POLLRDNORM | POLLRDBAND); | |
1213 | rcu_read_unlock(); | |
1214 | } | |
1215 | ||
7e6c131e YX |
1216 | /** |
1217 | * filter_connect - Handle all incoming messages for a connection-based socket | |
1218 | * @tsock: TIPC socket | |
1219 | * @msg: message | |
1220 | * | |
1221 | * Returns TIPC error status code and socket error status code | |
1222 | * once it encounters some errors | |
1223 | */ | |
1224 | static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf) | |
1225 | { | |
1226 | struct socket *sock = tsock->sk.sk_socket; | |
1227 | struct tipc_msg *msg = buf_msg(*buf); | |
584d24b3 | 1228 | struct sock *sk = &tsock->sk; |
7e6c131e | 1229 | u32 retval = TIPC_ERR_NO_PORT; |
584d24b3 | 1230 | int res; |
7e6c131e YX |
1231 | |
1232 | if (msg_mcast(msg)) | |
1233 | return retval; | |
1234 | ||
1235 | switch ((int)sock->state) { | |
1236 | case SS_CONNECTED: | |
1237 | /* Accept only connection-based messages sent by peer */ | |
1238 | if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) { | |
1239 | if (unlikely(msg_errcode(msg))) { | |
1240 | sock->state = SS_DISCONNECTING; | |
1241 | __tipc_disconnect(tsock->p); | |
1242 | } | |
1243 | retval = TIPC_OK; | |
1244 | } | |
1245 | break; | |
1246 | case SS_CONNECTING: | |
1247 | /* Accept only ACK or NACK message */ | |
584d24b3 YX |
1248 | if (unlikely(msg_errcode(msg))) { |
1249 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1250 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1251 | retval = TIPC_OK; |
1252 | break; | |
1253 | } | |
1254 | ||
1255 | if (unlikely(!msg_connected(msg))) | |
1256 | break; | |
1257 | ||
1258 | res = auto_connect(sock, msg); | |
1259 | if (res) { | |
1260 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1261 | sk->sk_err = -res; |
7e6c131e | 1262 | retval = TIPC_OK; |
584d24b3 YX |
1263 | break; |
1264 | } | |
1265 | ||
1266 | /* If an incoming message is an 'ACK-', it should be | |
1267 | * discarded here because it doesn't contain useful | |
1268 | * data. In addition, we should try to wake up | |
1269 | * connect() routine if sleeping. | |
1270 | */ | |
1271 | if (msg_data_sz(msg) == 0) { | |
1272 | kfree_skb(*buf); | |
1273 | *buf = NULL; | |
1274 | if (waitqueue_active(sk_sleep(sk))) | |
1275 | wake_up_interruptible(sk_sleep(sk)); | |
1276 | } | |
1277 | retval = TIPC_OK; | |
7e6c131e YX |
1278 | break; |
1279 | case SS_LISTENING: | |
1280 | case SS_UNCONNECTED: | |
1281 | /* Accept only SYN message */ | |
1282 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1283 | retval = TIPC_OK; | |
1284 | break; | |
1285 | case SS_DISCONNECTING: | |
1286 | break; | |
1287 | default: | |
1288 | pr_err("Unknown socket state %u\n", sock->state); | |
1289 | } | |
1290 | return retval; | |
1291 | } | |
1292 | ||
aba79f33 YX |
1293 | /** |
1294 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1295 | * @sk: socket | |
1296 | * @buf: message | |
1297 | * | |
1298 | * For all connection oriented messages, irrespective of importance, | |
1299 | * the default overload value (i.e. 67MB) is set as limit. | |
1300 | * | |
1301 | * For all connectionless messages, by default new queue limits are | |
1302 | * as belows: | |
1303 | * | |
cc79dd1b YX |
1304 | * TIPC_LOW_IMPORTANCE (4 MB) |
1305 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1306 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1307 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1308 | * |
1309 | * Returns overload limit according to corresponding message importance | |
1310 | */ | |
1311 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1312 | { | |
1313 | struct tipc_msg *msg = buf_msg(buf); | |
1314 | unsigned int limit; | |
1315 | ||
1316 | if (msg_connected(msg)) | |
cc79dd1b | 1317 | limit = sysctl_tipc_rmem[2]; |
aba79f33 | 1318 | else |
cc79dd1b YX |
1319 | limit = sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << |
1320 | msg_importance(msg); | |
aba79f33 YX |
1321 | return limit; |
1322 | } | |
1323 | ||
c4307285 | 1324 | /** |
0c3141e9 AS |
1325 | * filter_rcv - validate incoming message |
1326 | * @sk: socket | |
b97bf3fd | 1327 | * @buf: message |
c4307285 | 1328 | * |
0c3141e9 AS |
1329 | * Enqueues message on receive queue if acceptable; optionally handles |
1330 | * disconnect indication for a connected socket. | |
1331 | * | |
1332 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1333 | * |
b97bf3fd PL |
1334 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1335 | */ | |
0c3141e9 | 1336 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1337 | { |
0c3141e9 | 1338 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1339 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1340 | unsigned int limit = rcvbuf_limit(sk, buf); |
7e6c131e | 1341 | u32 res = TIPC_OK; |
b97bf3fd | 1342 | |
b97bf3fd | 1343 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 AS |
1344 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
1345 | return TIPC_ERR_NO_PORT; | |
0c3141e9 | 1346 | |
b97bf3fd | 1347 | if (sock->state == SS_READY) { |
b29f1428 | 1348 | if (msg_connected(msg)) |
b97bf3fd | 1349 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1350 | } else { |
7e6c131e YX |
1351 | res = filter_connect(tipc_sk(sk), &buf); |
1352 | if (res != TIPC_OK || buf == NULL) | |
1353 | return res; | |
b97bf3fd PL |
1354 | } |
1355 | ||
1356 | /* Reject message if there isn't room to queue it */ | |
aba79f33 YX |
1357 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
1358 | return TIPC_ERR_OVERLOAD; | |
b97bf3fd | 1359 | |
aba79f33 | 1360 | /* Enqueue message */ |
40682432 | 1361 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1362 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1363 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1364 | |
f288bef4 | 1365 | sk->sk_data_ready(sk, 0); |
0c3141e9 AS |
1366 | return TIPC_OK; |
1367 | } | |
b97bf3fd | 1368 | |
0c3141e9 AS |
1369 | /** |
1370 | * backlog_rcv - handle incoming message from backlog queue | |
1371 | * @sk: socket | |
1372 | * @buf: message | |
1373 | * | |
1374 | * Caller must hold socket lock, but not port lock. | |
1375 | * | |
1376 | * Returns 0 | |
1377 | */ | |
0c3141e9 AS |
1378 | static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
1379 | { | |
1380 | u32 res; | |
1381 | ||
1382 | res = filter_rcv(sk, buf); | |
1383 | if (res) | |
1384 | tipc_reject_msg(buf, res); | |
1385 | return 0; | |
1386 | } | |
1387 | ||
1388 | /** | |
1389 | * dispatch - handle incoming message | |
1390 | * @tport: TIPC port that received message | |
1391 | * @buf: message | |
1392 | * | |
1393 | * Called with port lock already taken. | |
1394 | * | |
1395 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) | |
1396 | */ | |
0c3141e9 AS |
1397 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) |
1398 | { | |
c0fee8ac | 1399 | struct sock *sk = tport->sk; |
0c3141e9 AS |
1400 | u32 res; |
1401 | ||
1402 | /* | |
1403 | * Process message if socket is unlocked; otherwise add to backlog queue | |
1404 | * | |
1405 | * This code is based on sk_receive_skb(), but must be distinct from it | |
1406 | * since a TIPC-specific filter/reject mechanism is utilized | |
1407 | */ | |
0c3141e9 AS |
1408 | bh_lock_sock(sk); |
1409 | if (!sock_owned_by_user(sk)) { | |
1410 | res = filter_rcv(sk, buf); | |
1411 | } else { | |
aba79f33 | 1412 | if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf))) |
53eecb1b ZY |
1413 | res = TIPC_ERR_OVERLOAD; |
1414 | else | |
1415 | res = TIPC_OK; | |
0c3141e9 AS |
1416 | } |
1417 | bh_unlock_sock(sk); | |
1418 | ||
1419 | return res; | |
b97bf3fd PL |
1420 | } |
1421 | ||
c4307285 | 1422 | /** |
b97bf3fd PL |
1423 | * wakeupdispatch - wake up port after congestion |
1424 | * @tport: port to wakeup | |
c4307285 | 1425 | * |
0c3141e9 | 1426 | * Called with port lock already taken. |
b97bf3fd | 1427 | */ |
b97bf3fd PL |
1428 | static void wakeupdispatch(struct tipc_port *tport) |
1429 | { | |
c0fee8ac | 1430 | struct sock *sk = tport->sk; |
b97bf3fd | 1431 | |
f288bef4 | 1432 | sk->sk_write_space(sk); |
b97bf3fd PL |
1433 | } |
1434 | ||
1435 | /** | |
1436 | * connect - establish a connection to another TIPC port | |
1437 | * @sock: socket structure | |
1438 | * @dest: socket address for destination port | |
1439 | * @destlen: size of socket address data structure | |
0c3141e9 | 1440 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1441 | * |
1442 | * Returns 0 on success, errno otherwise | |
1443 | */ | |
c4307285 | 1444 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1445 | int flags) |
1446 | { | |
0c3141e9 | 1447 | struct sock *sk = sock->sk; |
b89741a0 AS |
1448 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1449 | struct msghdr m = {NULL,}; | |
a0f40f02 | 1450 | unsigned int timeout; |
b89741a0 AS |
1451 | int res; |
1452 | ||
0c3141e9 AS |
1453 | lock_sock(sk); |
1454 | ||
b89741a0 | 1455 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1456 | if (sock->state == SS_READY) { |
1457 | res = -EOPNOTSUPP; | |
1458 | goto exit; | |
1459 | } | |
b89741a0 | 1460 | |
b89741a0 AS |
1461 | /* |
1462 | * Reject connection attempt using multicast address | |
1463 | * | |
1464 | * Note: send_msg() validates the rest of the address fields, | |
1465 | * so there's no need to do it here | |
1466 | */ | |
0c3141e9 AS |
1467 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1468 | res = -EINVAL; | |
1469 | goto exit; | |
1470 | } | |
1471 | ||
584d24b3 | 1472 | timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
b89741a0 | 1473 | |
584d24b3 YX |
1474 | switch (sock->state) { |
1475 | case SS_UNCONNECTED: | |
1476 | /* Send a 'SYN-' to destination */ | |
1477 | m.msg_name = dest; | |
1478 | m.msg_namelen = destlen; | |
1479 | ||
1480 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1481 | * indicate send_msg() is never blocked. | |
1482 | */ | |
1483 | if (!timeout) | |
1484 | m.msg_flags = MSG_DONTWAIT; | |
1485 | ||
1486 | res = send_msg(NULL, sock, &m, 0); | |
1487 | if ((res < 0) && (res != -EWOULDBLOCK)) | |
1488 | goto exit; | |
1489 | ||
1490 | /* Just entered SS_CONNECTING state; the only | |
1491 | * difference is that return value in non-blocking | |
1492 | * case is EINPROGRESS, rather than EALREADY. | |
1493 | */ | |
1494 | res = -EINPROGRESS; | |
1495 | break; | |
1496 | case SS_CONNECTING: | |
1497 | res = -EALREADY; | |
1498 | break; | |
1499 | case SS_CONNECTED: | |
1500 | res = -EISCONN; | |
1501 | break; | |
1502 | default: | |
1503 | res = -EINVAL; | |
0c3141e9 | 1504 | goto exit; |
584d24b3 | 1505 | } |
b89741a0 | 1506 | |
584d24b3 YX |
1507 | if (sock->state == SS_CONNECTING) { |
1508 | if (!timeout) | |
1509 | goto exit; | |
b89741a0 | 1510 | |
584d24b3 YX |
1511 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ |
1512 | release_sock(sk); | |
1513 | res = wait_event_interruptible_timeout(*sk_sleep(sk), | |
1514 | sock->state != SS_CONNECTING, | |
1515 | timeout ? (long)msecs_to_jiffies(timeout) | |
1516 | : MAX_SCHEDULE_TIMEOUT); | |
1517 | lock_sock(sk); | |
1518 | if (res <= 0) { | |
1519 | if (res == 0) | |
1520 | res = -ETIMEDOUT; | |
a016892c | 1521 | else |
584d24b3 YX |
1522 | ; /* leave "res" unchanged */ |
1523 | goto exit; | |
b89741a0 | 1524 | } |
b89741a0 AS |
1525 | } |
1526 | ||
584d24b3 YX |
1527 | if (unlikely(sock->state == SS_DISCONNECTING)) |
1528 | res = sock_error(sk); | |
1529 | else | |
1530 | res = 0; | |
1531 | ||
0c3141e9 AS |
1532 | exit: |
1533 | release_sock(sk); | |
b89741a0 | 1534 | return res; |
b97bf3fd PL |
1535 | } |
1536 | ||
c4307285 | 1537 | /** |
b97bf3fd PL |
1538 | * listen - allow socket to listen for incoming connections |
1539 | * @sock: socket structure | |
1540 | * @len: (unused) | |
c4307285 | 1541 | * |
b97bf3fd PL |
1542 | * Returns 0 on success, errno otherwise |
1543 | */ | |
b97bf3fd PL |
1544 | static int listen(struct socket *sock, int len) |
1545 | { | |
0c3141e9 AS |
1546 | struct sock *sk = sock->sk; |
1547 | int res; | |
1548 | ||
1549 | lock_sock(sk); | |
b97bf3fd | 1550 | |
245f3d34 | 1551 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1552 | res = -EINVAL; |
1553 | else { | |
1554 | sock->state = SS_LISTENING; | |
1555 | res = 0; | |
1556 | } | |
1557 | ||
1558 | release_sock(sk); | |
1559 | return res; | |
b97bf3fd PL |
1560 | } |
1561 | ||
c4307285 | 1562 | /** |
b97bf3fd PL |
1563 | * accept - wait for connection request |
1564 | * @sock: listening socket | |
1565 | * @newsock: new socket that is to be connected | |
1566 | * @flags: file-related flags associated with socket | |
c4307285 | 1567 | * |
b97bf3fd PL |
1568 | * Returns 0 on success, errno otherwise |
1569 | */ | |
0c3141e9 | 1570 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1571 | { |
0fef8f20 | 1572 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1573 | struct sk_buff *buf; |
0fef8f20 PG |
1574 | struct tipc_sock *new_tsock; |
1575 | struct tipc_port *new_tport; | |
1576 | struct tipc_msg *msg; | |
1577 | u32 new_ref; | |
1578 | ||
0c3141e9 | 1579 | int res; |
b97bf3fd | 1580 | |
0c3141e9 | 1581 | lock_sock(sk); |
b97bf3fd | 1582 | |
0c3141e9 AS |
1583 | if (sock->state != SS_LISTENING) { |
1584 | res = -EINVAL; | |
b97bf3fd PL |
1585 | goto exit; |
1586 | } | |
b97bf3fd | 1587 | |
0c3141e9 AS |
1588 | while (skb_queue_empty(&sk->sk_receive_queue)) { |
1589 | if (flags & O_NONBLOCK) { | |
1590 | res = -EWOULDBLOCK; | |
1591 | goto exit; | |
1592 | } | |
1593 | release_sock(sk); | |
aa395145 | 1594 | res = wait_event_interruptible(*sk_sleep(sk), |
0c3141e9 AS |
1595 | (!skb_queue_empty(&sk->sk_receive_queue))); |
1596 | lock_sock(sk); | |
1597 | if (res) | |
1598 | goto exit; | |
1599 | } | |
1600 | ||
1601 | buf = skb_peek(&sk->sk_receive_queue); | |
1602 | ||
c5fa7b3c | 1603 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1604 | if (res) |
1605 | goto exit; | |
b97bf3fd | 1606 | |
0fef8f20 PG |
1607 | new_sk = new_sock->sk; |
1608 | new_tsock = tipc_sk(new_sk); | |
1609 | new_tport = new_tsock->p; | |
1610 | new_ref = new_tport->ref; | |
1611 | msg = buf_msg(buf); | |
b97bf3fd | 1612 | |
0fef8f20 PG |
1613 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1614 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1615 | ||
1616 | /* | |
1617 | * Reject any stray messages received by new socket | |
1618 | * before the socket lock was taken (very, very unlikely) | |
1619 | */ | |
1620 | reject_rx_queue(new_sk); | |
1621 | ||
1622 | /* Connect new socket to it's peer */ | |
1623 | new_tsock->peer_name.ref = msg_origport(msg); | |
1624 | new_tsock->peer_name.node = msg_orignode(msg); | |
1625 | tipc_connect(new_ref, &new_tsock->peer_name); | |
1626 | new_sock->state = SS_CONNECTED; | |
1627 | ||
1628 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1629 | if (msg_named(msg)) { | |
1630 | new_tport->conn_type = msg_nametype(msg); | |
1631 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1632 | } |
0fef8f20 PG |
1633 | |
1634 | /* | |
1635 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1636 | * Respond to 'SYN+' by queuing it on new socket. | |
1637 | */ | |
1638 | if (!msg_data_sz(msg)) { | |
1639 | struct msghdr m = {NULL,}; | |
1640 | ||
1641 | advance_rx_queue(sk); | |
1642 | send_packet(NULL, new_sock, &m, 0); | |
1643 | } else { | |
1644 | __skb_dequeue(&sk->sk_receive_queue); | |
1645 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 1646 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
1647 | } |
1648 | release_sock(new_sk); | |
1649 | ||
b97bf3fd | 1650 | exit: |
0c3141e9 | 1651 | release_sock(sk); |
b97bf3fd PL |
1652 | return res; |
1653 | } | |
1654 | ||
1655 | /** | |
1656 | * shutdown - shutdown socket connection | |
1657 | * @sock: socket structure | |
e247a8f5 | 1658 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1659 | * |
1660 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1661 | * |
b97bf3fd PL |
1662 | * Returns 0 on success, errno otherwise |
1663 | */ | |
b97bf3fd PL |
1664 | static int shutdown(struct socket *sock, int how) |
1665 | { | |
0c3141e9 AS |
1666 | struct sock *sk = sock->sk; |
1667 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1668 | struct sk_buff *buf; |
1669 | int res; | |
1670 | ||
e247a8f5 AS |
1671 | if (how != SHUT_RDWR) |
1672 | return -EINVAL; | |
b97bf3fd | 1673 | |
0c3141e9 | 1674 | lock_sock(sk); |
b97bf3fd PL |
1675 | |
1676 | switch (sock->state) { | |
0c3141e9 | 1677 | case SS_CONNECTING: |
b97bf3fd PL |
1678 | case SS_CONNECTED: |
1679 | ||
b97bf3fd | 1680 | restart: |
617d3c7a | 1681 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1682 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1683 | if (buf) { | |
40682432 | 1684 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 1685 | kfree_skb(buf); |
b97bf3fd PL |
1686 | goto restart; |
1687 | } | |
0c3141e9 | 1688 | tipc_disconnect(tport->ref); |
b97bf3fd | 1689 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1690 | } else { |
1691 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1692 | } |
0c3141e9 AS |
1693 | |
1694 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1695 | |
1696 | /* fall through */ | |
1697 | ||
1698 | case SS_DISCONNECTING: | |
1699 | ||
75031151 | 1700 | /* Discard any unreceived messages */ |
57467e56 | 1701 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1702 | |
1703 | /* Wake up anyone sleeping in poll */ | |
1704 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1705 | res = 0; |
1706 | break; | |
1707 | ||
1708 | default: | |
1709 | res = -ENOTCONN; | |
1710 | } | |
1711 | ||
0c3141e9 | 1712 | release_sock(sk); |
b97bf3fd PL |
1713 | return res; |
1714 | } | |
1715 | ||
1716 | /** | |
1717 | * setsockopt - set socket option | |
1718 | * @sock: socket structure | |
1719 | * @lvl: option level | |
1720 | * @opt: option identifier | |
1721 | * @ov: pointer to new option value | |
1722 | * @ol: length of option value | |
c4307285 YH |
1723 | * |
1724 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1725 | * (to ease compatibility). |
c4307285 | 1726 | * |
b97bf3fd PL |
1727 | * Returns 0 on success, errno otherwise |
1728 | */ | |
ae8509c4 PG |
1729 | static int setsockopt(struct socket *sock, int lvl, int opt, char __user *ov, |
1730 | unsigned int ol) | |
b97bf3fd | 1731 | { |
0c3141e9 AS |
1732 | struct sock *sk = sock->sk; |
1733 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1734 | u32 value; |
1735 | int res; | |
1736 | ||
c4307285 YH |
1737 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1738 | return 0; | |
b97bf3fd PL |
1739 | if (lvl != SOL_TIPC) |
1740 | return -ENOPROTOOPT; | |
1741 | if (ol < sizeof(value)) | |
1742 | return -EINVAL; | |
2db9983a AS |
1743 | res = get_user(value, (u32 __user *)ov); |
1744 | if (res) | |
b97bf3fd PL |
1745 | return res; |
1746 | ||
0c3141e9 | 1747 | lock_sock(sk); |
c4307285 | 1748 | |
b97bf3fd PL |
1749 | switch (opt) { |
1750 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1751 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1752 | break; |
1753 | case TIPC_SRC_DROPPABLE: | |
1754 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1755 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1756 | else |
b97bf3fd PL |
1757 | res = -ENOPROTOOPT; |
1758 | break; | |
1759 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1760 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1761 | break; |
1762 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1763 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 1764 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1765 | break; |
1766 | default: | |
1767 | res = -EINVAL; | |
1768 | } | |
1769 | ||
0c3141e9 AS |
1770 | release_sock(sk); |
1771 | ||
b97bf3fd PL |
1772 | return res; |
1773 | } | |
1774 | ||
1775 | /** | |
1776 | * getsockopt - get socket option | |
1777 | * @sock: socket structure | |
1778 | * @lvl: option level | |
1779 | * @opt: option identifier | |
1780 | * @ov: receptacle for option value | |
1781 | * @ol: receptacle for length of option value | |
c4307285 YH |
1782 | * |
1783 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1784 | * (to ease compatibility). |
c4307285 | 1785 | * |
b97bf3fd PL |
1786 | * Returns 0 on success, errno otherwise |
1787 | */ | |
ae8509c4 PG |
1788 | static int getsockopt(struct socket *sock, int lvl, int opt, char __user *ov, |
1789 | int __user *ol) | |
b97bf3fd | 1790 | { |
0c3141e9 AS |
1791 | struct sock *sk = sock->sk; |
1792 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1793 | int len; |
b97bf3fd | 1794 | u32 value; |
c4307285 | 1795 | int res; |
b97bf3fd | 1796 | |
c4307285 YH |
1797 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1798 | return put_user(0, ol); | |
b97bf3fd PL |
1799 | if (lvl != SOL_TIPC) |
1800 | return -ENOPROTOOPT; | |
2db9983a AS |
1801 | res = get_user(len, ol); |
1802 | if (res) | |
c4307285 | 1803 | return res; |
b97bf3fd | 1804 | |
0c3141e9 | 1805 | lock_sock(sk); |
b97bf3fd PL |
1806 | |
1807 | switch (opt) { | |
1808 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1809 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1810 | break; |
1811 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1812 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1813 | break; |
1814 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1815 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1816 | break; |
1817 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1818 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1819 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1820 | break; |
0e65967e | 1821 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 1822 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 1823 | break; |
0e65967e | 1824 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1825 | value = skb_queue_len(&sk->sk_receive_queue); |
1826 | break; | |
b97bf3fd PL |
1827 | default: |
1828 | res = -EINVAL; | |
1829 | } | |
1830 | ||
0c3141e9 AS |
1831 | release_sock(sk); |
1832 | ||
25860c3b PG |
1833 | if (res) |
1834 | return res; /* "get" failed */ | |
b97bf3fd | 1835 | |
25860c3b PG |
1836 | if (len < sizeof(value)) |
1837 | return -EINVAL; | |
1838 | ||
1839 | if (copy_to_user(ov, &value, sizeof(value))) | |
1840 | return -EFAULT; | |
1841 | ||
1842 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1843 | } |
1844 | ||
ae86b9e3 BH |
1845 | /* Protocol switches for the various types of TIPC sockets */ |
1846 | ||
bca65eae | 1847 | static const struct proto_ops msg_ops = { |
0e65967e | 1848 | .owner = THIS_MODULE, |
b97bf3fd PL |
1849 | .family = AF_TIPC, |
1850 | .release = release, | |
1851 | .bind = bind, | |
1852 | .connect = connect, | |
5eee6a6d | 1853 | .socketpair = sock_no_socketpair, |
245f3d34 | 1854 | .accept = sock_no_accept, |
b97bf3fd PL |
1855 | .getname = get_name, |
1856 | .poll = poll, | |
5eee6a6d | 1857 | .ioctl = sock_no_ioctl, |
245f3d34 | 1858 | .listen = sock_no_listen, |
b97bf3fd PL |
1859 | .shutdown = shutdown, |
1860 | .setsockopt = setsockopt, | |
1861 | .getsockopt = getsockopt, | |
1862 | .sendmsg = send_msg, | |
1863 | .recvmsg = recv_msg, | |
8238745a YH |
1864 | .mmap = sock_no_mmap, |
1865 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1866 | }; |
1867 | ||
bca65eae | 1868 | static const struct proto_ops packet_ops = { |
0e65967e | 1869 | .owner = THIS_MODULE, |
b97bf3fd PL |
1870 | .family = AF_TIPC, |
1871 | .release = release, | |
1872 | .bind = bind, | |
1873 | .connect = connect, | |
5eee6a6d | 1874 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1875 | .accept = accept, |
1876 | .getname = get_name, | |
1877 | .poll = poll, | |
5eee6a6d | 1878 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1879 | .listen = listen, |
1880 | .shutdown = shutdown, | |
1881 | .setsockopt = setsockopt, | |
1882 | .getsockopt = getsockopt, | |
1883 | .sendmsg = send_packet, | |
1884 | .recvmsg = recv_msg, | |
8238745a YH |
1885 | .mmap = sock_no_mmap, |
1886 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1887 | }; |
1888 | ||
bca65eae | 1889 | static const struct proto_ops stream_ops = { |
0e65967e | 1890 | .owner = THIS_MODULE, |
b97bf3fd PL |
1891 | .family = AF_TIPC, |
1892 | .release = release, | |
1893 | .bind = bind, | |
1894 | .connect = connect, | |
5eee6a6d | 1895 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1896 | .accept = accept, |
1897 | .getname = get_name, | |
1898 | .poll = poll, | |
5eee6a6d | 1899 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1900 | .listen = listen, |
1901 | .shutdown = shutdown, | |
1902 | .setsockopt = setsockopt, | |
1903 | .getsockopt = getsockopt, | |
1904 | .sendmsg = send_stream, | |
1905 | .recvmsg = recv_stream, | |
8238745a YH |
1906 | .mmap = sock_no_mmap, |
1907 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1908 | }; |
1909 | ||
bca65eae | 1910 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 1911 | .owner = THIS_MODULE, |
b97bf3fd | 1912 | .family = AF_TIPC, |
c5fa7b3c | 1913 | .create = tipc_sk_create |
b97bf3fd PL |
1914 | }; |
1915 | ||
1916 | static struct proto tipc_proto = { | |
1917 | .name = "TIPC", | |
1918 | .owner = THIS_MODULE, | |
cc79dd1b YX |
1919 | .obj_size = sizeof(struct tipc_sock), |
1920 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
1921 | }; |
1922 | ||
c5fa7b3c YX |
1923 | static struct proto tipc_proto_kern = { |
1924 | .name = "TIPC", | |
1925 | .obj_size = sizeof(struct tipc_sock), | |
1926 | .sysctl_rmem = sysctl_tipc_rmem | |
1927 | }; | |
1928 | ||
b97bf3fd | 1929 | /** |
4323add6 | 1930 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 1931 | * |
b97bf3fd PL |
1932 | * Returns 0 on success, errno otherwise |
1933 | */ | |
4323add6 | 1934 | int tipc_socket_init(void) |
b97bf3fd PL |
1935 | { |
1936 | int res; | |
1937 | ||
c4307285 | 1938 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 1939 | if (res) { |
2cf8aa19 | 1940 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
1941 | goto out; |
1942 | } | |
1943 | ||
1944 | res = sock_register(&tipc_family_ops); | |
1945 | if (res) { | |
2cf8aa19 | 1946 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
1947 | proto_unregister(&tipc_proto); |
1948 | goto out; | |
1949 | } | |
1950 | ||
1951 | sockets_enabled = 1; | |
1952 | out: | |
1953 | return res; | |
1954 | } | |
1955 | ||
1956 | /** | |
4323add6 | 1957 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 1958 | */ |
4323add6 | 1959 | void tipc_socket_stop(void) |
b97bf3fd PL |
1960 | { |
1961 | if (!sockets_enabled) | |
1962 | return; | |
1963 | ||
1964 | sockets_enabled = 0; | |
1965 | sock_unregister(tipc_family_ops.family); | |
1966 | proto_unregister(&tipc_proto); | |
1967 | } |