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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 | |
0c3141e9 | 58 | static int backlog_rcv(struct sock *sk, struct sk_buff *skb); |
b97bf3fd PL |
59 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); |
60 | static void wakeupdispatch(struct tipc_port *tport); | |
f288bef4 YX |
61 | static void tipc_data_ready(struct sock *sk, int len); |
62 | static void tipc_write_space(struct sock *sk); | |
c5fa7b3c YX |
63 | static int release(struct socket *sock); |
64 | static int accept(struct socket *sock, struct socket *new_sock, int flags); | |
b97bf3fd | 65 | |
bca65eae FW |
66 | static const struct proto_ops packet_ops; |
67 | static const struct proto_ops stream_ops; | |
68 | static const struct proto_ops msg_ops; | |
b97bf3fd PL |
69 | |
70 | static struct proto tipc_proto; | |
c5fa7b3c | 71 | static struct proto tipc_proto_kern; |
b97bf3fd | 72 | |
e3ec9c7d | 73 | static int sockets_enabled; |
b97bf3fd | 74 | |
c4307285 | 75 | /* |
0c3141e9 AS |
76 | * Revised TIPC socket locking policy: |
77 | * | |
78 | * Most socket operations take the standard socket lock when they start | |
79 | * and hold it until they finish (or until they need to sleep). Acquiring | |
80 | * this lock grants the owner exclusive access to the fields of the socket | |
81 | * data structures, with the exception of the backlog queue. A few socket | |
82 | * operations can be done without taking the socket lock because they only | |
83 | * read socket information that never changes during the life of the socket. | |
84 | * | |
85 | * Socket operations may acquire the lock for the associated TIPC port if they | |
86 | * need to perform an operation on the port. If any routine needs to acquire | |
87 | * both the socket lock and the port lock it must take the socket lock first | |
88 | * to avoid the risk of deadlock. | |
89 | * | |
90 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
91 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
92 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
93 | * and either handles the message itself or adds it to the socket's backlog | |
94 | * queue; in the latter case the queued message is processed once the process | |
95 | * owning the socket lock releases it. | |
96 | * | |
97 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
98 | * the problem of a blocked socket operation preventing any other operations | |
99 | * from occurring. However, applications must be careful if they have | |
100 | * multiple threads trying to send (or receive) on the same socket, as these | |
101 | * operations might interfere with each other. For example, doing a connect | |
102 | * and a receive at the same time might allow the receive to consume the | |
103 | * ACK message meant for the connect. While additional work could be done | |
104 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
105 | * | |
106 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
107 | * that another operation that must be performed in a non-blocking manner is | |
108 | * not delayed for very long because the lock has already been taken. | |
109 | * | |
110 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
111 | * constant over its lifetime; such fields can be examined without taking | |
112 | * the socket lock and/or port lock, and do not need to be re-read even | |
113 | * after resuming processing after waiting. These fields include: | |
114 | * - socket type | |
115 | * - pointer to socket sk structure (aka tipc_sock structure) | |
116 | * - pointer to port structure | |
117 | * - port reference | |
118 | */ | |
119 | ||
120 | /** | |
121 | * advance_rx_queue - discard first buffer in socket receive queue | |
122 | * | |
123 | * Caller must hold socket lock | |
b97bf3fd | 124 | */ |
0c3141e9 | 125 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 126 | { |
5f6d9123 | 127 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
128 | } |
129 | ||
b97bf3fd | 130 | /** |
0c3141e9 AS |
131 | * reject_rx_queue - reject all buffers in socket receive queue |
132 | * | |
133 | * Caller must hold socket lock | |
b97bf3fd | 134 | */ |
0c3141e9 | 135 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 136 | { |
0c3141e9 AS |
137 | struct sk_buff *buf; |
138 | ||
9da3d475 | 139 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) |
0c3141e9 | 140 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
b97bf3fd PL |
141 | } |
142 | ||
143 | /** | |
c5fa7b3c | 144 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 145 | * @net: network namespace (must be default network) |
b97bf3fd PL |
146 | * @sock: pre-allocated socket structure |
147 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 148 | * @kern: caused by kernel or by userspace? |
c4307285 | 149 | * |
0c3141e9 AS |
150 | * This routine creates additional data structures used by the TIPC socket, |
151 | * initializes them, and links them together. | |
b97bf3fd PL |
152 | * |
153 | * Returns 0 on success, errno otherwise | |
154 | */ | |
c5fa7b3c YX |
155 | static int tipc_sk_create(struct net *net, struct socket *sock, int protocol, |
156 | int kern) | |
b97bf3fd | 157 | { |
0c3141e9 AS |
158 | const struct proto_ops *ops; |
159 | socket_state state; | |
b97bf3fd | 160 | struct sock *sk; |
7ef43eba | 161 | struct tipc_port *tp_ptr; |
0c3141e9 AS |
162 | |
163 | /* Validate arguments */ | |
b97bf3fd PL |
164 | if (unlikely(protocol != 0)) |
165 | return -EPROTONOSUPPORT; | |
166 | ||
b97bf3fd PL |
167 | switch (sock->type) { |
168 | case SOCK_STREAM: | |
0c3141e9 AS |
169 | ops = &stream_ops; |
170 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
171 | break; |
172 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
173 | ops = &packet_ops; |
174 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
175 | break; |
176 | case SOCK_DGRAM: | |
b97bf3fd | 177 | case SOCK_RDM: |
0c3141e9 AS |
178 | ops = &msg_ops; |
179 | state = SS_READY; | |
b97bf3fd | 180 | break; |
49978651 | 181 | default: |
49978651 | 182 | return -EPROTOTYPE; |
b97bf3fd PL |
183 | } |
184 | ||
0c3141e9 | 185 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
186 | if (!kern) |
187 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
188 | else | |
189 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
190 | ||
0c3141e9 | 191 | if (sk == NULL) |
b97bf3fd | 192 | return -ENOMEM; |
b97bf3fd | 193 | |
0c3141e9 | 194 | /* Allocate TIPC port for socket to use */ |
3c5db8e4 YX |
195 | tp_ptr = tipc_createport(sk, &dispatch, &wakeupdispatch, |
196 | TIPC_LOW_IMPORTANCE); | |
0ea52241 | 197 | if (unlikely(!tp_ptr)) { |
0c3141e9 AS |
198 | sk_free(sk); |
199 | return -ENOMEM; | |
200 | } | |
b97bf3fd | 201 | |
0c3141e9 | 202 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
203 | sock->ops = ops; |
204 | sock->state = state; | |
b97bf3fd | 205 | |
0c3141e9 | 206 | sock_init_data(sock, sk); |
0c3141e9 | 207 | sk->sk_backlog_rcv = backlog_rcv; |
cc79dd1b | 208 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
209 | sk->sk_data_ready = tipc_data_ready; |
210 | sk->sk_write_space = tipc_write_space; | |
0ea52241 | 211 | tipc_sk(sk)->p = tp_ptr; |
a0f40f02 | 212 | tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT; |
b97bf3fd | 213 | |
7ef43eba AS |
214 | spin_unlock_bh(tp_ptr->lock); |
215 | ||
0c3141e9 | 216 | if (sock->state == SS_READY) { |
0ea52241 | 217 | tipc_set_portunreturnable(tp_ptr->ref, 1); |
0c3141e9 | 218 | if (sock->type == SOCK_DGRAM) |
0ea52241 | 219 | tipc_set_portunreliable(tp_ptr->ref, 1); |
0c3141e9 | 220 | } |
b97bf3fd PL |
221 | |
222 | return 0; | |
223 | } | |
224 | ||
c5fa7b3c YX |
225 | /** |
226 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
227 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
228 | * | |
229 | * We cannot use sock_creat_kern here because it bumps module user count. | |
230 | * Since socket owner and creator is the same module we must make sure | |
231 | * that module count remains zero for module local sockets, otherwise | |
232 | * we cannot do rmmod. | |
233 | * | |
234 | * Returns 0 on success, errno otherwise | |
235 | */ | |
236 | int tipc_sock_create_local(int type, struct socket **res) | |
237 | { | |
238 | int rc; | |
c5fa7b3c YX |
239 | |
240 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
241 | if (rc < 0) { | |
242 | pr_err("Failed to create kernel socket\n"); | |
243 | return rc; | |
244 | } | |
245 | tipc_sk_create(&init_net, *res, 0, 1); | |
246 | ||
c5fa7b3c YX |
247 | return 0; |
248 | } | |
249 | ||
250 | /** | |
251 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
252 | * @sock: the socket to be released. | |
253 | * | |
254 | * Module reference count is not incremented when such sockets are created, | |
255 | * so we must keep it from being decremented when they are released. | |
256 | */ | |
257 | void tipc_sock_release_local(struct socket *sock) | |
258 | { | |
259 | release(sock); | |
260 | sock->ops = NULL; | |
261 | sock_release(sock); | |
262 | } | |
263 | ||
264 | /** | |
265 | * tipc_sock_accept_local - accept a connection on a socket created | |
266 | * with tipc_sock_create_local. Use this function to avoid that | |
267 | * module reference count is inadvertently incremented. | |
268 | * | |
269 | * @sock: the accepting socket | |
270 | * @newsock: reference to the new socket to be created | |
271 | * @flags: socket flags | |
272 | */ | |
273 | ||
274 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 275 | int flags) |
c5fa7b3c YX |
276 | { |
277 | struct sock *sk = sock->sk; | |
278 | int ret; | |
279 | ||
280 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
281 | sk->sk_protocol, newsock); | |
282 | if (ret < 0) | |
283 | return ret; | |
284 | ||
285 | ret = accept(sock, *newsock, flags); | |
286 | if (ret < 0) { | |
287 | sock_release(*newsock); | |
288 | return ret; | |
289 | } | |
290 | (*newsock)->ops = sock->ops; | |
291 | return ret; | |
292 | } | |
293 | ||
b97bf3fd PL |
294 | /** |
295 | * release - destroy a TIPC socket | |
296 | * @sock: socket to destroy | |
297 | * | |
298 | * This routine cleans up any messages that are still queued on the socket. | |
299 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
300 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
301 | * and any others are discarded. (If the first message on a STREAM socket | |
302 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 303 | * |
b97bf3fd PL |
304 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
305 | * are returned or discarded according to the "destination droppable" setting | |
306 | * specified for the message by the sender. | |
307 | * | |
308 | * Returns 0 on success, errno otherwise | |
309 | */ | |
b97bf3fd PL |
310 | static int release(struct socket *sock) |
311 | { | |
b97bf3fd | 312 | struct sock *sk = sock->sk; |
0c3141e9 | 313 | struct tipc_port *tport; |
b97bf3fd | 314 | struct sk_buff *buf; |
0c3141e9 | 315 | int res; |
b97bf3fd | 316 | |
0c3141e9 AS |
317 | /* |
318 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
319 | * releases a pre-allocated child socket that was never used) | |
320 | */ | |
0c3141e9 | 321 | if (sk == NULL) |
b97bf3fd | 322 | return 0; |
c4307285 | 323 | |
0c3141e9 AS |
324 | tport = tipc_sk_port(sk); |
325 | lock_sock(sk); | |
326 | ||
327 | /* | |
328 | * Reject all unreceived messages, except on an active connection | |
329 | * (which disconnects locally & sends a 'FIN+' to peer) | |
330 | */ | |
b97bf3fd | 331 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
332 | buf = __skb_dequeue(&sk->sk_receive_queue); |
333 | if (buf == NULL) | |
b97bf3fd | 334 | break; |
40682432 | 335 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 336 | kfree_skb(buf); |
0c3141e9 AS |
337 | else { |
338 | if ((sock->state == SS_CONNECTING) || | |
339 | (sock->state == SS_CONNECTED)) { | |
340 | sock->state = SS_DISCONNECTING; | |
341 | tipc_disconnect(tport->ref); | |
342 | } | |
b97bf3fd | 343 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 344 | } |
b97bf3fd PL |
345 | } |
346 | ||
0c3141e9 AS |
347 | /* |
348 | * Delete TIPC port; this ensures no more messages are queued | |
349 | * (also disconnects an active connection & sends a 'FIN-' to peer) | |
350 | */ | |
84602761 | 351 | res = tipc_deleteport(tport); |
b97bf3fd | 352 | |
0c3141e9 | 353 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 354 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 355 | |
0c3141e9 | 356 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
357 | sock->state = SS_DISCONNECTING; |
358 | release_sock(sk); | |
b97bf3fd PL |
359 | |
360 | sock_put(sk); | |
0c3141e9 | 361 | sock->sk = NULL; |
b97bf3fd | 362 | |
b97bf3fd PL |
363 | return res; |
364 | } | |
365 | ||
366 | /** | |
367 | * bind - associate or disassocate TIPC name(s) with a socket | |
368 | * @sock: socket structure | |
369 | * @uaddr: socket address describing name(s) and desired operation | |
370 | * @uaddr_len: size of socket address data structure | |
c4307285 | 371 | * |
b97bf3fd PL |
372 | * Name and name sequence binding is indicated using a positive scope value; |
373 | * a negative scope value unbinds the specified name. Specifying no name | |
374 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 375 | * |
b97bf3fd | 376 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
377 | * |
378 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
379 | * access any non-constant socket information. | |
b97bf3fd | 380 | */ |
b97bf3fd PL |
381 | static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) |
382 | { | |
84602761 | 383 | struct sock *sk = sock->sk; |
b97bf3fd | 384 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
84602761 YX |
385 | struct tipc_port *tport = tipc_sk_port(sock->sk); |
386 | int res = -EINVAL; | |
b97bf3fd | 387 | |
84602761 YX |
388 | lock_sock(sk); |
389 | if (unlikely(!uaddr_len)) { | |
390 | res = tipc_withdraw(tport, 0, NULL); | |
391 | goto exit; | |
392 | } | |
c4307285 | 393 | |
84602761 YX |
394 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
395 | res = -EINVAL; | |
396 | goto exit; | |
397 | } | |
398 | if (addr->family != AF_TIPC) { | |
399 | res = -EAFNOSUPPORT; | |
400 | goto exit; | |
401 | } | |
b97bf3fd | 402 | |
b97bf3fd PL |
403 | if (addr->addrtype == TIPC_ADDR_NAME) |
404 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
405 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
406 | res = -EAFNOSUPPORT; | |
407 | goto exit; | |
408 | } | |
c4307285 | 409 | |
13a2e898 | 410 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 411 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
412 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
413 | res = -EACCES; | |
414 | goto exit; | |
415 | } | |
c422f1bd | 416 | |
84602761 YX |
417 | res = (addr->scope > 0) ? |
418 | tipc_publish(tport, addr->scope, &addr->addr.nameseq) : | |
419 | tipc_withdraw(tport, -addr->scope, &addr->addr.nameseq); | |
420 | exit: | |
421 | release_sock(sk); | |
422 | return res; | |
b97bf3fd PL |
423 | } |
424 | ||
c4307285 | 425 | /** |
b97bf3fd PL |
426 | * get_name - get port ID of socket or peer socket |
427 | * @sock: socket structure | |
428 | * @uaddr: area for returned socket address | |
429 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 430 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 431 | * |
b97bf3fd | 432 | * Returns 0 on success, errno otherwise |
0c3141e9 | 433 | * |
2da59918 AS |
434 | * NOTE: This routine doesn't need to take the socket lock since it only |
435 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 436 | * a completely predictable manner). |
b97bf3fd | 437 | */ |
c4307285 | 438 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
439 | int *uaddr_len, int peer) |
440 | { | |
b97bf3fd | 441 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
2da59918 | 442 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd | 443 | |
88f8a5e3 | 444 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 445 | if (peer) { |
2da59918 AS |
446 | if ((sock->state != SS_CONNECTED) && |
447 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
448 | return -ENOTCONN; | |
449 | addr->addr.id.ref = tsock->peer_name.ref; | |
450 | addr->addr.id.node = tsock->peer_name.node; | |
0c3141e9 | 451 | } else { |
b924dcf0 AS |
452 | addr->addr.id.ref = tsock->p->ref; |
453 | addr->addr.id.node = tipc_own_addr; | |
0c3141e9 | 454 | } |
b97bf3fd PL |
455 | |
456 | *uaddr_len = sizeof(*addr); | |
457 | addr->addrtype = TIPC_ADDR_ID; | |
458 | addr->family = AF_TIPC; | |
459 | addr->scope = 0; | |
b97bf3fd PL |
460 | addr->addr.name.domain = 0; |
461 | ||
0c3141e9 | 462 | return 0; |
b97bf3fd PL |
463 | } |
464 | ||
465 | /** | |
466 | * poll - read and possibly block on pollmask | |
467 | * @file: file structure associated with the socket | |
468 | * @sock: socket for which to calculate the poll bits | |
469 | * @wait: ??? | |
470 | * | |
9b674e82 AS |
471 | * Returns pollmask value |
472 | * | |
473 | * COMMENTARY: | |
474 | * It appears that the usual socket locking mechanisms are not useful here | |
475 | * since the pollmask info is potentially out-of-date the moment this routine | |
476 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
477 | * to handle any preventable race conditions, so TIPC will do the same ... | |
478 | * | |
479 | * TIPC sets the returned events as follows: | |
f662c070 AS |
480 | * |
481 | * socket state flags set | |
482 | * ------------ --------- | |
483 | * unconnected no read flags | |
c4fc298a | 484 | * POLLOUT if port is not congested |
f662c070 AS |
485 | * |
486 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
487 | * no write flags | |
488 | * | |
489 | * connected POLLIN/POLLRDNORM if data in rx queue | |
490 | * POLLOUT if port is not congested | |
491 | * | |
492 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
493 | * no write flags | |
494 | * | |
495 | * listening POLLIN if SYN in rx queue | |
496 | * no write flags | |
497 | * | |
498 | * ready POLLIN/POLLRDNORM if data in rx queue | |
499 | * [connectionless] POLLOUT (since port cannot be congested) | |
500 | * | |
501 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
502 | * imply that the operation will succeed, merely that it should be performed | |
503 | * and will not block. | |
b97bf3fd | 504 | */ |
c4307285 | 505 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
506 | poll_table *wait) |
507 | { | |
9b674e82 | 508 | struct sock *sk = sock->sk; |
f662c070 | 509 | u32 mask = 0; |
9b674e82 | 510 | |
f288bef4 | 511 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 512 | |
f662c070 | 513 | switch ((int)sock->state) { |
c4fc298a EH |
514 | case SS_UNCONNECTED: |
515 | if (!tipc_sk_port(sk)->congested) | |
516 | mask |= POLLOUT; | |
517 | break; | |
f662c070 AS |
518 | case SS_READY: |
519 | case SS_CONNECTED: | |
520 | if (!tipc_sk_port(sk)->congested) | |
521 | mask |= POLLOUT; | |
522 | /* fall thru' */ | |
523 | case SS_CONNECTING: | |
524 | case SS_LISTENING: | |
525 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
526 | mask |= (POLLIN | POLLRDNORM); | |
527 | break; | |
528 | case SS_DISCONNECTING: | |
529 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
530 | break; | |
531 | } | |
9b674e82 AS |
532 | |
533 | return mask; | |
b97bf3fd PL |
534 | } |
535 | ||
c4307285 | 536 | /** |
b97bf3fd PL |
537 | * dest_name_check - verify user is permitted to send to specified port name |
538 | * @dest: destination address | |
539 | * @m: descriptor for message to be sent | |
c4307285 | 540 | * |
b97bf3fd PL |
541 | * Prevents restricted configuration commands from being issued by |
542 | * unauthorized users. | |
c4307285 | 543 | * |
b97bf3fd PL |
544 | * Returns 0 if permission is granted, otherwise errno |
545 | */ | |
05790c64 | 546 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
547 | { |
548 | struct tipc_cfg_msg_hdr hdr; | |
549 | ||
c4307285 YH |
550 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
551 | return 0; | |
552 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
553 | return 0; | |
c4307285 YH |
554 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
555 | return -EACCES; | |
b97bf3fd | 556 | |
3f8dd944 AS |
557 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
558 | return -EMSGSIZE; | |
c4307285 | 559 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 560 | return -EFAULT; |
70cb2347 | 561 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 562 | return -EACCES; |
c4307285 | 563 | |
b97bf3fd PL |
564 | return 0; |
565 | } | |
566 | ||
3f40504f YX |
567 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
568 | { | |
569 | struct sock *sk = sock->sk; | |
570 | struct tipc_port *tport = tipc_sk_port(sk); | |
571 | DEFINE_WAIT(wait); | |
572 | int done; | |
573 | ||
574 | do { | |
575 | int err = sock_error(sk); | |
576 | if (err) | |
577 | return err; | |
578 | if (sock->state == SS_DISCONNECTING) | |
579 | return -EPIPE; | |
580 | if (!*timeo_p) | |
581 | return -EAGAIN; | |
582 | if (signal_pending(current)) | |
583 | return sock_intr_errno(*timeo_p); | |
584 | ||
585 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
586 | done = sk_wait_event(sk, timeo_p, !tport->congested); | |
587 | finish_wait(sk_sleep(sk), &wait); | |
588 | } while (!done); | |
589 | return 0; | |
590 | } | |
591 | ||
b97bf3fd PL |
592 | /** |
593 | * send_msg - send message in connectionless manner | |
0c3141e9 | 594 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
595 | * @sock: socket structure |
596 | * @m: message to send | |
e9024f0f | 597 | * @total_len: length of message |
c4307285 | 598 | * |
b97bf3fd | 599 | * Message must have an destination specified explicitly. |
c4307285 | 600 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
601 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
602 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 603 | * |
b97bf3fd PL |
604 | * Returns the number of bytes sent on success, or errno otherwise |
605 | */ | |
b97bf3fd PL |
606 | static int send_msg(struct kiocb *iocb, struct socket *sock, |
607 | struct msghdr *m, size_t total_len) | |
608 | { | |
0c3141e9 AS |
609 | struct sock *sk = sock->sk; |
610 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 611 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 612 | int needs_conn; |
3f40504f | 613 | long timeo; |
b97bf3fd PL |
614 | int res = -EINVAL; |
615 | ||
616 | if (unlikely(!dest)) | |
617 | return -EDESTADDRREQ; | |
51f9cc1f AS |
618 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
619 | (dest->family != AF_TIPC))) | |
b97bf3fd | 620 | return -EINVAL; |
97f8b87e | 621 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 | 622 | return -EMSGSIZE; |
b97bf3fd | 623 | |
0c3141e9 AS |
624 | if (iocb) |
625 | lock_sock(sk); | |
626 | ||
b97bf3fd PL |
627 | needs_conn = (sock->state != SS_READY); |
628 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
629 | if (sock->state == SS_LISTENING) { |
630 | res = -EPIPE; | |
631 | goto exit; | |
632 | } | |
633 | if (sock->state != SS_UNCONNECTED) { | |
634 | res = -EISCONN; | |
635 | goto exit; | |
636 | } | |
5d21cb70 | 637 | if (tport->published) { |
0c3141e9 AS |
638 | res = -EOPNOTSUPP; |
639 | goto exit; | |
640 | } | |
3388007b | 641 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
642 | tport->conn_type = dest->addr.name.name.type; |
643 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 644 | } |
b97bf3fd PL |
645 | |
646 | /* Abort any pending connection attempts (very unlikely) */ | |
0c3141e9 | 647 | reject_rx_queue(sk); |
b97bf3fd PL |
648 | } |
649 | ||
3f40504f | 650 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
c4307285 YH |
651 | do { |
652 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
653 | res = dest_name_check(dest, m); |
654 | if (res) | |
0c3141e9 AS |
655 | break; |
656 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
657 | &dest->addr.name.name, |
658 | dest->addr.name.domain, | |
26896904 AS |
659 | m->msg_iov, |
660 | total_len); | |
0e65967e | 661 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
0c3141e9 | 662 | res = tipc_send2port(tport->ref, |
c4307285 | 663 | &dest->addr.id, |
26896904 AS |
664 | m->msg_iov, |
665 | total_len); | |
0e65967e | 666 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
667 | if (needs_conn) { |
668 | res = -EOPNOTSUPP; | |
0c3141e9 | 669 | break; |
b97bf3fd | 670 | } |
2db9983a AS |
671 | res = dest_name_check(dest, m); |
672 | if (res) | |
0c3141e9 AS |
673 | break; |
674 | res = tipc_multicast(tport->ref, | |
c4307285 | 675 | &dest->addr.nameseq, |
26896904 AS |
676 | m->msg_iov, |
677 | total_len); | |
c4307285 YH |
678 | } |
679 | if (likely(res != -ELINKCONG)) { | |
a016892c | 680 | if (needs_conn && (res >= 0)) |
0c3141e9 | 681 | sock->state = SS_CONNECTING; |
0c3141e9 | 682 | break; |
c4307285 | 683 | } |
3f40504f YX |
684 | res = tipc_wait_for_sndmsg(sock, &timeo); |
685 | if (res) | |
0c3141e9 | 686 | break; |
c4307285 | 687 | } while (1); |
0c3141e9 AS |
688 | |
689 | exit: | |
690 | if (iocb) | |
691 | release_sock(sk); | |
692 | return res; | |
b97bf3fd PL |
693 | } |
694 | ||
391a6dd1 YX |
695 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
696 | { | |
697 | struct sock *sk = sock->sk; | |
698 | struct tipc_port *tport = tipc_sk_port(sk); | |
699 | DEFINE_WAIT(wait); | |
700 | int done; | |
701 | ||
702 | do { | |
703 | int err = sock_error(sk); | |
704 | if (err) | |
705 | return err; | |
706 | if (sock->state == SS_DISCONNECTING) | |
707 | return -EPIPE; | |
708 | else if (sock->state != SS_CONNECTED) | |
709 | return -ENOTCONN; | |
710 | if (!*timeo_p) | |
711 | return -EAGAIN; | |
712 | if (signal_pending(current)) | |
713 | return sock_intr_errno(*timeo_p); | |
714 | ||
715 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
716 | done = sk_wait_event(sk, timeo_p, | |
717 | (!tport->congested || !tport->connected)); | |
718 | finish_wait(sk_sleep(sk), &wait); | |
719 | } while (!done); | |
720 | return 0; | |
721 | } | |
722 | ||
c4307285 | 723 | /** |
b97bf3fd | 724 | * send_packet - send a connection-oriented message |
0c3141e9 | 725 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
726 | * @sock: socket structure |
727 | * @m: message to send | |
e9024f0f | 728 | * @total_len: length of message |
c4307285 | 729 | * |
b97bf3fd | 730 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 731 | * |
b97bf3fd PL |
732 | * Returns the number of bytes sent on success, or errno otherwise |
733 | */ | |
b97bf3fd PL |
734 | static int send_packet(struct kiocb *iocb, struct socket *sock, |
735 | struct msghdr *m, size_t total_len) | |
736 | { | |
0c3141e9 AS |
737 | struct sock *sk = sock->sk; |
738 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 739 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
391a6dd1 YX |
740 | int res = -EINVAL; |
741 | long timeo; | |
b97bf3fd PL |
742 | |
743 | /* Handle implied connection establishment */ | |
b97bf3fd PL |
744 | if (unlikely(dest)) |
745 | return send_msg(iocb, sock, m, total_len); | |
746 | ||
97f8b87e | 747 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 AS |
748 | return -EMSGSIZE; |
749 | ||
0c3141e9 AS |
750 | if (iocb) |
751 | lock_sock(sk); | |
b97bf3fd | 752 | |
391a6dd1 YX |
753 | if (unlikely(sock->state != SS_CONNECTED)) { |
754 | if (sock->state == SS_DISCONNECTING) | |
755 | res = -EPIPE; | |
756 | else | |
757 | res = -ENOTCONN; | |
758 | goto exit; | |
759 | } | |
1d835874 | 760 | |
391a6dd1 | 761 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
c4307285 | 762 | do { |
9446b87a | 763 | res = tipc_send(tport->ref, m->msg_iov, total_len); |
a016892c | 764 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 765 | break; |
391a6dd1 YX |
766 | res = tipc_wait_for_sndpkt(sock, &timeo); |
767 | if (res) | |
0c3141e9 | 768 | break; |
c4307285 | 769 | } while (1); |
391a6dd1 | 770 | exit: |
0c3141e9 AS |
771 | if (iocb) |
772 | release_sock(sk); | |
773 | return res; | |
b97bf3fd PL |
774 | } |
775 | ||
c4307285 | 776 | /** |
b97bf3fd PL |
777 | * send_stream - send stream-oriented data |
778 | * @iocb: (unused) | |
779 | * @sock: socket structure | |
780 | * @m: data to send | |
781 | * @total_len: total length of data to be sent | |
c4307285 | 782 | * |
b97bf3fd | 783 | * Used for SOCK_STREAM data. |
c4307285 YH |
784 | * |
785 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 786 | * or errno if no data sent |
b97bf3fd | 787 | */ |
b97bf3fd PL |
788 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
789 | struct msghdr *m, size_t total_len) | |
790 | { | |
0c3141e9 AS |
791 | struct sock *sk = sock->sk; |
792 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
793 | struct msghdr my_msg; |
794 | struct iovec my_iov; | |
795 | struct iovec *curr_iov; | |
796 | int curr_iovlen; | |
797 | char __user *curr_start; | |
05646c91 | 798 | u32 hdr_size; |
b97bf3fd PL |
799 | int curr_left; |
800 | int bytes_to_send; | |
1303e8f1 | 801 | int bytes_sent; |
b97bf3fd | 802 | int res; |
c4307285 | 803 | |
0c3141e9 AS |
804 | lock_sock(sk); |
805 | ||
05646c91 | 806 | /* Handle special cases where there is no connection */ |
c4307285 | 807 | if (unlikely(sock->state != SS_CONNECTED)) { |
3b8401fe | 808 | if (sock->state == SS_UNCONNECTED) |
0c3141e9 | 809 | res = send_packet(NULL, sock, m, total_len); |
b0555976 | 810 | else |
811 | res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN; | |
3b8401fe | 812 | goto exit; |
c4307285 | 813 | } |
b97bf3fd | 814 | |
0c3141e9 AS |
815 | if (unlikely(m->msg_name)) { |
816 | res = -EISCONN; | |
817 | goto exit; | |
818 | } | |
eb5959c2 | 819 | |
97f8b87e | 820 | if (total_len > (unsigned int)INT_MAX) { |
c29c3f70 AS |
821 | res = -EMSGSIZE; |
822 | goto exit; | |
823 | } | |
824 | ||
c4307285 | 825 | /* |
b97bf3fd PL |
826 | * Send each iovec entry using one or more messages |
827 | * | |
c4307285 | 828 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
829 | * (i.e. one large iovec entry), but could be improved to pass sets |
830 | * of small iovec entries into send_packet(). | |
831 | */ | |
1303e8f1 AS |
832 | curr_iov = m->msg_iov; |
833 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
834 | my_msg.msg_iov = &my_iov; |
835 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
836 | my_msg.msg_flags = m->msg_flags; |
837 | my_msg.msg_name = NULL; | |
1303e8f1 | 838 | bytes_sent = 0; |
b97bf3fd | 839 | |
05646c91 AS |
840 | hdr_size = msg_hdr_sz(&tport->phdr); |
841 | ||
b97bf3fd PL |
842 | while (curr_iovlen--) { |
843 | curr_start = curr_iov->iov_base; | |
844 | curr_left = curr_iov->iov_len; | |
845 | ||
846 | while (curr_left) { | |
05646c91 AS |
847 | bytes_to_send = tport->max_pkt - hdr_size; |
848 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) | |
849 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
850 | if (curr_left < bytes_to_send) | |
851 | bytes_to_send = curr_left; | |
b97bf3fd PL |
852 | my_iov.iov_base = curr_start; |
853 | my_iov.iov_len = bytes_to_send; | |
26896904 | 854 | res = send_packet(NULL, sock, &my_msg, bytes_to_send); |
2db9983a | 855 | if (res < 0) { |
0c3141e9 | 856 | if (bytes_sent) |
05646c91 | 857 | res = bytes_sent; |
0c3141e9 | 858 | goto exit; |
1303e8f1 | 859 | } |
b97bf3fd PL |
860 | curr_left -= bytes_to_send; |
861 | curr_start += bytes_to_send; | |
1303e8f1 | 862 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
863 | } |
864 | ||
865 | curr_iov++; | |
866 | } | |
0c3141e9 AS |
867 | res = bytes_sent; |
868 | exit: | |
869 | release_sock(sk); | |
870 | return res; | |
b97bf3fd PL |
871 | } |
872 | ||
873 | /** | |
874 | * auto_connect - complete connection setup to a remote port | |
875 | * @sock: socket structure | |
b97bf3fd | 876 | * @msg: peer's response message |
c4307285 | 877 | * |
b97bf3fd PL |
878 | * Returns 0 on success, errno otherwise |
879 | */ | |
0c3141e9 | 880 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 881 | { |
2da59918 | 882 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
584d24b3 | 883 | struct tipc_port *p_ptr; |
b97bf3fd | 884 | |
2da59918 AS |
885 | tsock->peer_name.ref = msg_origport(msg); |
886 | tsock->peer_name.node = msg_orignode(msg); | |
584d24b3 YX |
887 | p_ptr = tipc_port_deref(tsock->p->ref); |
888 | if (!p_ptr) | |
889 | return -EINVAL; | |
890 | ||
891 | __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name); | |
892 | ||
893 | if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) | |
894 | return -EINVAL; | |
895 | msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg)); | |
b97bf3fd PL |
896 | sock->state = SS_CONNECTED; |
897 | return 0; | |
898 | } | |
899 | ||
900 | /** | |
901 | * set_orig_addr - capture sender's address for received message | |
902 | * @m: descriptor for message info | |
903 | * @msg: received message header | |
c4307285 | 904 | * |
b97bf3fd PL |
905 | * Note: Address is not captured if not requested by receiver. |
906 | */ | |
05790c64 | 907 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 908 | { |
c4307285 | 909 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 910 | |
c4307285 | 911 | if (addr) { |
b97bf3fd PL |
912 | addr->family = AF_TIPC; |
913 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 914 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
915 | addr->addr.id.ref = msg_origport(msg); |
916 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
917 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
918 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
919 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
920 | } | |
921 | } | |
922 | ||
923 | /** | |
c4307285 | 924 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
925 | * @m: descriptor for message info |
926 | * @msg: received message header | |
927 | * @tport: TIPC port associated with message | |
c4307285 | 928 | * |
b97bf3fd | 929 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 930 | * |
b97bf3fd PL |
931 | * Returns 0 if successful, otherwise errno |
932 | */ | |
05790c64 | 933 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
ae8509c4 | 934 | struct tipc_port *tport) |
b97bf3fd PL |
935 | { |
936 | u32 anc_data[3]; | |
937 | u32 err; | |
938 | u32 dest_type; | |
3546c750 | 939 | int has_name; |
b97bf3fd PL |
940 | int res; |
941 | ||
942 | if (likely(m->msg_controllen == 0)) | |
943 | return 0; | |
944 | ||
945 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
946 | err = msg ? msg_errcode(msg) : 0; |
947 | if (unlikely(err)) { | |
948 | anc_data[0] = err; | |
949 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
950 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
951 | if (res) | |
b97bf3fd | 952 | return res; |
2db9983a AS |
953 | if (anc_data[1]) { |
954 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
955 | msg_data(msg)); | |
956 | if (res) | |
957 | return res; | |
958 | } | |
b97bf3fd PL |
959 | } |
960 | ||
961 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
962 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
963 | switch (dest_type) { | |
964 | case TIPC_NAMED_MSG: | |
3546c750 | 965 | has_name = 1; |
b97bf3fd PL |
966 | anc_data[0] = msg_nametype(msg); |
967 | anc_data[1] = msg_namelower(msg); | |
968 | anc_data[2] = msg_namelower(msg); | |
969 | break; | |
970 | case TIPC_MCAST_MSG: | |
3546c750 | 971 | has_name = 1; |
b97bf3fd PL |
972 | anc_data[0] = msg_nametype(msg); |
973 | anc_data[1] = msg_namelower(msg); | |
974 | anc_data[2] = msg_nameupper(msg); | |
975 | break; | |
976 | case TIPC_CONN_MSG: | |
3546c750 | 977 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
978 | anc_data[0] = tport->conn_type; |
979 | anc_data[1] = tport->conn_instance; | |
980 | anc_data[2] = tport->conn_instance; | |
981 | break; | |
982 | default: | |
3546c750 | 983 | has_name = 0; |
b97bf3fd | 984 | } |
2db9983a AS |
985 | if (has_name) { |
986 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
987 | if (res) | |
988 | return res; | |
989 | } | |
b97bf3fd PL |
990 | |
991 | return 0; | |
992 | } | |
993 | ||
9bbb4ecc YX |
994 | static int tipc_wait_for_rcvmsg(struct socket *sock, long timeo) |
995 | { | |
996 | struct sock *sk = sock->sk; | |
997 | DEFINE_WAIT(wait); | |
998 | int err; | |
999 | ||
1000 | for (;;) { | |
1001 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1002 | if (skb_queue_empty(&sk->sk_receive_queue)) { | |
1003 | if (sock->state == SS_DISCONNECTING) { | |
1004 | err = -ENOTCONN; | |
1005 | break; | |
1006 | } | |
1007 | release_sock(sk); | |
1008 | timeo = schedule_timeout(timeo); | |
1009 | lock_sock(sk); | |
1010 | } | |
1011 | err = 0; | |
1012 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1013 | break; | |
1014 | err = sock_intr_errno(timeo); | |
1015 | if (signal_pending(current)) | |
1016 | break; | |
1017 | err = -EAGAIN; | |
1018 | if (!timeo) | |
1019 | break; | |
1020 | } | |
1021 | finish_wait(sk_sleep(sk), &wait); | |
1022 | return err; | |
1023 | } | |
1024 | ||
c4307285 | 1025 | /** |
b97bf3fd PL |
1026 | * recv_msg - receive packet-oriented message |
1027 | * @iocb: (unused) | |
1028 | * @m: descriptor for message info | |
1029 | * @buf_len: total size of user buffer area | |
1030 | * @flags: receive flags | |
c4307285 | 1031 | * |
b97bf3fd PL |
1032 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1033 | * If the complete message doesn't fit in user area, truncate it. | |
1034 | * | |
1035 | * Returns size of returned message data, errno otherwise | |
1036 | */ | |
b97bf3fd PL |
1037 | static int recv_msg(struct kiocb *iocb, struct socket *sock, |
1038 | struct msghdr *m, size_t buf_len, int flags) | |
1039 | { | |
0c3141e9 AS |
1040 | struct sock *sk = sock->sk; |
1041 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1042 | struct sk_buff *buf; |
1043 | struct tipc_msg *msg; | |
9bbb4ecc | 1044 | long timeo; |
b97bf3fd PL |
1045 | unsigned int sz; |
1046 | u32 err; | |
1047 | int res; | |
1048 | ||
0c3141e9 | 1049 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1050 | if (unlikely(!buf_len)) |
1051 | return -EINVAL; | |
1052 | ||
0c3141e9 | 1053 | lock_sock(sk); |
b97bf3fd | 1054 | |
0c3141e9 AS |
1055 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1056 | res = -ENOTCONN; | |
b97bf3fd PL |
1057 | goto exit; |
1058 | } | |
1059 | ||
9bbb4ecc | 1060 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1061 | restart: |
b97bf3fd | 1062 | |
0c3141e9 | 1063 | /* Look for a message in receive queue; wait if necessary */ |
9bbb4ecc YX |
1064 | res = tipc_wait_for_rcvmsg(sock, timeo); |
1065 | if (res) | |
1066 | goto exit; | |
b97bf3fd | 1067 | |
0c3141e9 | 1068 | /* Look at first message in receive queue */ |
0c3141e9 | 1069 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1070 | msg = buf_msg(buf); |
1071 | sz = msg_data_sz(msg); | |
1072 | err = msg_errcode(msg); | |
1073 | ||
b97bf3fd | 1074 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1075 | if ((!sz) && (!err)) { |
0c3141e9 | 1076 | advance_rx_queue(sk); |
b97bf3fd PL |
1077 | goto restart; |
1078 | } | |
1079 | ||
1080 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1081 | set_orig_addr(m, msg); |
1082 | ||
1083 | /* Capture ancillary data (optional) */ | |
0c3141e9 AS |
1084 | res = anc_data_recv(m, msg, tport); |
1085 | if (res) | |
b97bf3fd PL |
1086 | goto exit; |
1087 | ||
1088 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1089 | if (!err) { |
1090 | if (unlikely(buf_len < sz)) { | |
1091 | sz = buf_len; | |
1092 | m->msg_flags |= MSG_TRUNC; | |
1093 | } | |
0232fd0a AS |
1094 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1095 | m->msg_iov, sz); | |
1096 | if (res) | |
b97bf3fd | 1097 | goto exit; |
b97bf3fd PL |
1098 | res = sz; |
1099 | } else { | |
1100 | if ((sock->state == SS_READY) || | |
1101 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1102 | res = 0; | |
1103 | else | |
1104 | res = -ECONNRESET; | |
1105 | } | |
1106 | ||
1107 | /* Consume received message (optional) */ | |
b97bf3fd | 1108 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1109 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
1110 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1111 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1112 | advance_rx_queue(sk); | |
c4307285 | 1113 | } |
b97bf3fd | 1114 | exit: |
0c3141e9 | 1115 | release_sock(sk); |
b97bf3fd PL |
1116 | return res; |
1117 | } | |
1118 | ||
c4307285 | 1119 | /** |
b97bf3fd PL |
1120 | * recv_stream - receive stream-oriented data |
1121 | * @iocb: (unused) | |
1122 | * @m: descriptor for message info | |
1123 | * @buf_len: total size of user buffer area | |
1124 | * @flags: receive flags | |
c4307285 YH |
1125 | * |
1126 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1127 | * will optionally wait for more; never truncates data. |
1128 | * | |
1129 | * Returns size of returned message data, errno otherwise | |
1130 | */ | |
b97bf3fd PL |
1131 | static int recv_stream(struct kiocb *iocb, struct socket *sock, |
1132 | struct msghdr *m, size_t buf_len, int flags) | |
1133 | { | |
0c3141e9 AS |
1134 | struct sock *sk = sock->sk; |
1135 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1136 | struct sk_buff *buf; |
1137 | struct tipc_msg *msg; | |
9bbb4ecc | 1138 | long timeo; |
b97bf3fd | 1139 | unsigned int sz; |
3720d40b | 1140 | int sz_to_copy, target, needed; |
b97bf3fd | 1141 | int sz_copied = 0; |
b97bf3fd | 1142 | u32 err; |
0c3141e9 | 1143 | int res = 0; |
b97bf3fd | 1144 | |
0c3141e9 | 1145 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1146 | if (unlikely(!buf_len)) |
1147 | return -EINVAL; | |
1148 | ||
0c3141e9 | 1149 | lock_sock(sk); |
b97bf3fd | 1150 | |
9bbb4ecc | 1151 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1152 | res = -ENOTCONN; |
b97bf3fd PL |
1153 | goto exit; |
1154 | } | |
1155 | ||
3720d40b | 1156 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1157 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1158 | |
617d3c7a | 1159 | restart: |
0c3141e9 | 1160 | /* Look for a message in receive queue; wait if necessary */ |
9bbb4ecc YX |
1161 | res = tipc_wait_for_rcvmsg(sock, timeo); |
1162 | if (res) | |
1163 | goto exit; | |
b97bf3fd | 1164 | |
0c3141e9 | 1165 | /* Look at first message in receive queue */ |
0c3141e9 | 1166 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1167 | msg = buf_msg(buf); |
1168 | sz = msg_data_sz(msg); | |
1169 | err = msg_errcode(msg); | |
1170 | ||
1171 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1172 | if ((!sz) && (!err)) { |
0c3141e9 | 1173 | advance_rx_queue(sk); |
b97bf3fd PL |
1174 | goto restart; |
1175 | } | |
1176 | ||
1177 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1178 | if (sz_copied == 0) { |
1179 | set_orig_addr(m, msg); | |
0c3141e9 AS |
1180 | res = anc_data_recv(m, msg, tport); |
1181 | if (res) | |
b97bf3fd PL |
1182 | goto exit; |
1183 | } | |
1184 | ||
1185 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1186 | if (!err) { |
0232fd0a | 1187 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1188 | |
0232fd0a | 1189 | sz -= offset; |
b97bf3fd PL |
1190 | needed = (buf_len - sz_copied); |
1191 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1192 | |
1193 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1194 | m->msg_iov, sz_to_copy); | |
1195 | if (res) | |
b97bf3fd | 1196 | goto exit; |
0232fd0a | 1197 | |
b97bf3fd PL |
1198 | sz_copied += sz_to_copy; |
1199 | ||
1200 | if (sz_to_copy < sz) { | |
1201 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1202 | TIPC_SKB_CB(buf)->handle = |
1203 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1204 | goto exit; |
1205 | } | |
b97bf3fd PL |
1206 | } else { |
1207 | if (sz_copied != 0) | |
1208 | goto exit; /* can't add error msg to valid data */ | |
1209 | ||
1210 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1211 | res = 0; | |
1212 | else | |
1213 | res = -ECONNRESET; | |
1214 | } | |
1215 | ||
1216 | /* Consume received message (optional) */ | |
b97bf3fd | 1217 | if (likely(!(flags & MSG_PEEK))) { |
0c3141e9 AS |
1218 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1219 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1220 | advance_rx_queue(sk); | |
c4307285 | 1221 | } |
b97bf3fd PL |
1222 | |
1223 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1224 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1225 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1226 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1227 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1228 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1229 | goto restart; |
1230 | ||
1231 | exit: | |
0c3141e9 | 1232 | release_sock(sk); |
a3b0a5a9 | 1233 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1234 | } |
1235 | ||
f288bef4 YX |
1236 | /** |
1237 | * tipc_write_space - wake up thread if port congestion is released | |
1238 | * @sk: socket | |
1239 | */ | |
1240 | static void tipc_write_space(struct sock *sk) | |
1241 | { | |
1242 | struct socket_wq *wq; | |
1243 | ||
1244 | rcu_read_lock(); | |
1245 | wq = rcu_dereference(sk->sk_wq); | |
1246 | if (wq_has_sleeper(wq)) | |
1247 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1248 | POLLWRNORM | POLLWRBAND); | |
1249 | rcu_read_unlock(); | |
1250 | } | |
1251 | ||
1252 | /** | |
1253 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1254 | * @sk: socket | |
1255 | * @len: the length of messages | |
1256 | */ | |
1257 | static void tipc_data_ready(struct sock *sk, int len) | |
1258 | { | |
1259 | struct socket_wq *wq; | |
1260 | ||
1261 | rcu_read_lock(); | |
1262 | wq = rcu_dereference(sk->sk_wq); | |
1263 | if (wq_has_sleeper(wq)) | |
1264 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1265 | POLLRDNORM | POLLRDBAND); | |
1266 | rcu_read_unlock(); | |
1267 | } | |
1268 | ||
7e6c131e YX |
1269 | /** |
1270 | * filter_connect - Handle all incoming messages for a connection-based socket | |
1271 | * @tsock: TIPC socket | |
1272 | * @msg: message | |
1273 | * | |
1274 | * Returns TIPC error status code and socket error status code | |
1275 | * once it encounters some errors | |
1276 | */ | |
1277 | static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf) | |
1278 | { | |
1279 | struct socket *sock = tsock->sk.sk_socket; | |
1280 | struct tipc_msg *msg = buf_msg(*buf); | |
584d24b3 | 1281 | struct sock *sk = &tsock->sk; |
7e6c131e | 1282 | u32 retval = TIPC_ERR_NO_PORT; |
584d24b3 | 1283 | int res; |
7e6c131e YX |
1284 | |
1285 | if (msg_mcast(msg)) | |
1286 | return retval; | |
1287 | ||
1288 | switch ((int)sock->state) { | |
1289 | case SS_CONNECTED: | |
1290 | /* Accept only connection-based messages sent by peer */ | |
1291 | if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) { | |
1292 | if (unlikely(msg_errcode(msg))) { | |
1293 | sock->state = SS_DISCONNECTING; | |
1294 | __tipc_disconnect(tsock->p); | |
1295 | } | |
1296 | retval = TIPC_OK; | |
1297 | } | |
1298 | break; | |
1299 | case SS_CONNECTING: | |
1300 | /* Accept only ACK or NACK message */ | |
584d24b3 YX |
1301 | if (unlikely(msg_errcode(msg))) { |
1302 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1303 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1304 | retval = TIPC_OK; |
1305 | break; | |
1306 | } | |
1307 | ||
1308 | if (unlikely(!msg_connected(msg))) | |
1309 | break; | |
1310 | ||
1311 | res = auto_connect(sock, msg); | |
1312 | if (res) { | |
1313 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1314 | sk->sk_err = -res; |
7e6c131e | 1315 | retval = TIPC_OK; |
584d24b3 YX |
1316 | break; |
1317 | } | |
1318 | ||
1319 | /* If an incoming message is an 'ACK-', it should be | |
1320 | * discarded here because it doesn't contain useful | |
1321 | * data. In addition, we should try to wake up | |
1322 | * connect() routine if sleeping. | |
1323 | */ | |
1324 | if (msg_data_sz(msg) == 0) { | |
1325 | kfree_skb(*buf); | |
1326 | *buf = NULL; | |
1327 | if (waitqueue_active(sk_sleep(sk))) | |
1328 | wake_up_interruptible(sk_sleep(sk)); | |
1329 | } | |
1330 | retval = TIPC_OK; | |
7e6c131e YX |
1331 | break; |
1332 | case SS_LISTENING: | |
1333 | case SS_UNCONNECTED: | |
1334 | /* Accept only SYN message */ | |
1335 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1336 | retval = TIPC_OK; | |
1337 | break; | |
1338 | case SS_DISCONNECTING: | |
1339 | break; | |
1340 | default: | |
1341 | pr_err("Unknown socket state %u\n", sock->state); | |
1342 | } | |
1343 | return retval; | |
1344 | } | |
1345 | ||
aba79f33 YX |
1346 | /** |
1347 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1348 | * @sk: socket | |
1349 | * @buf: message | |
1350 | * | |
1351 | * For all connection oriented messages, irrespective of importance, | |
1352 | * the default overload value (i.e. 67MB) is set as limit. | |
1353 | * | |
1354 | * For all connectionless messages, by default new queue limits are | |
1355 | * as belows: | |
1356 | * | |
cc79dd1b YX |
1357 | * TIPC_LOW_IMPORTANCE (4 MB) |
1358 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1359 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1360 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1361 | * |
1362 | * Returns overload limit according to corresponding message importance | |
1363 | */ | |
1364 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1365 | { | |
1366 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1367 | |
1368 | if (msg_connected(msg)) | |
0cee6bbe | 1369 | return sysctl_tipc_rmem[2]; |
1370 | ||
1371 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1372 | msg_importance(msg); | |
aba79f33 YX |
1373 | } |
1374 | ||
c4307285 | 1375 | /** |
0c3141e9 AS |
1376 | * filter_rcv - validate incoming message |
1377 | * @sk: socket | |
b97bf3fd | 1378 | * @buf: message |
c4307285 | 1379 | * |
0c3141e9 AS |
1380 | * Enqueues message on receive queue if acceptable; optionally handles |
1381 | * disconnect indication for a connected socket. | |
1382 | * | |
1383 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1384 | * |
b97bf3fd PL |
1385 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1386 | */ | |
0c3141e9 | 1387 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1388 | { |
0c3141e9 | 1389 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1390 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1391 | unsigned int limit = rcvbuf_limit(sk, buf); |
7e6c131e | 1392 | u32 res = TIPC_OK; |
b97bf3fd | 1393 | |
b97bf3fd | 1394 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 AS |
1395 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
1396 | return TIPC_ERR_NO_PORT; | |
0c3141e9 | 1397 | |
b97bf3fd | 1398 | if (sock->state == SS_READY) { |
b29f1428 | 1399 | if (msg_connected(msg)) |
b97bf3fd | 1400 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1401 | } else { |
7e6c131e YX |
1402 | res = filter_connect(tipc_sk(sk), &buf); |
1403 | if (res != TIPC_OK || buf == NULL) | |
1404 | return res; | |
b97bf3fd PL |
1405 | } |
1406 | ||
1407 | /* Reject message if there isn't room to queue it */ | |
aba79f33 YX |
1408 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
1409 | return TIPC_ERR_OVERLOAD; | |
b97bf3fd | 1410 | |
aba79f33 | 1411 | /* Enqueue message */ |
40682432 | 1412 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1413 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1414 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1415 | |
f288bef4 | 1416 | sk->sk_data_ready(sk, 0); |
0c3141e9 AS |
1417 | return TIPC_OK; |
1418 | } | |
b97bf3fd | 1419 | |
0c3141e9 AS |
1420 | /** |
1421 | * backlog_rcv - handle incoming message from backlog queue | |
1422 | * @sk: socket | |
1423 | * @buf: message | |
1424 | * | |
1425 | * Caller must hold socket lock, but not port lock. | |
1426 | * | |
1427 | * Returns 0 | |
1428 | */ | |
0c3141e9 AS |
1429 | static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
1430 | { | |
1431 | u32 res; | |
1432 | ||
1433 | res = filter_rcv(sk, buf); | |
1434 | if (res) | |
1435 | tipc_reject_msg(buf, res); | |
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | /** | |
1440 | * dispatch - handle incoming message | |
1441 | * @tport: TIPC port that received message | |
1442 | * @buf: message | |
1443 | * | |
1444 | * Called with port lock already taken. | |
1445 | * | |
1446 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) | |
1447 | */ | |
0c3141e9 AS |
1448 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) |
1449 | { | |
c0fee8ac | 1450 | struct sock *sk = tport->sk; |
0c3141e9 AS |
1451 | u32 res; |
1452 | ||
1453 | /* | |
1454 | * Process message if socket is unlocked; otherwise add to backlog queue | |
1455 | * | |
1456 | * This code is based on sk_receive_skb(), but must be distinct from it | |
1457 | * since a TIPC-specific filter/reject mechanism is utilized | |
1458 | */ | |
0c3141e9 AS |
1459 | bh_lock_sock(sk); |
1460 | if (!sock_owned_by_user(sk)) { | |
1461 | res = filter_rcv(sk, buf); | |
1462 | } else { | |
aba79f33 | 1463 | if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf))) |
53eecb1b ZY |
1464 | res = TIPC_ERR_OVERLOAD; |
1465 | else | |
1466 | res = TIPC_OK; | |
0c3141e9 AS |
1467 | } |
1468 | bh_unlock_sock(sk); | |
1469 | ||
1470 | return res; | |
b97bf3fd PL |
1471 | } |
1472 | ||
c4307285 | 1473 | /** |
b97bf3fd PL |
1474 | * wakeupdispatch - wake up port after congestion |
1475 | * @tport: port to wakeup | |
c4307285 | 1476 | * |
0c3141e9 | 1477 | * Called with port lock already taken. |
b97bf3fd | 1478 | */ |
b97bf3fd PL |
1479 | static void wakeupdispatch(struct tipc_port *tport) |
1480 | { | |
c0fee8ac | 1481 | struct sock *sk = tport->sk; |
b97bf3fd | 1482 | |
f288bef4 | 1483 | sk->sk_write_space(sk); |
b97bf3fd PL |
1484 | } |
1485 | ||
78eb3a53 YX |
1486 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1487 | { | |
1488 | struct sock *sk = sock->sk; | |
1489 | DEFINE_WAIT(wait); | |
1490 | int done; | |
1491 | ||
1492 | do { | |
1493 | int err = sock_error(sk); | |
1494 | if (err) | |
1495 | return err; | |
1496 | if (!*timeo_p) | |
1497 | return -ETIMEDOUT; | |
1498 | if (signal_pending(current)) | |
1499 | return sock_intr_errno(*timeo_p); | |
1500 | ||
1501 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1502 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1503 | finish_wait(sk_sleep(sk), &wait); | |
1504 | } while (!done); | |
1505 | return 0; | |
1506 | } | |
1507 | ||
b97bf3fd PL |
1508 | /** |
1509 | * connect - establish a connection to another TIPC port | |
1510 | * @sock: socket structure | |
1511 | * @dest: socket address for destination port | |
1512 | * @destlen: size of socket address data structure | |
0c3141e9 | 1513 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1514 | * |
1515 | * Returns 0 on success, errno otherwise | |
1516 | */ | |
c4307285 | 1517 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1518 | int flags) |
1519 | { | |
0c3141e9 | 1520 | struct sock *sk = sock->sk; |
b89741a0 AS |
1521 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1522 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1523 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1524 | socket_state previous; | |
b89741a0 AS |
1525 | int res; |
1526 | ||
0c3141e9 AS |
1527 | lock_sock(sk); |
1528 | ||
b89741a0 | 1529 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1530 | if (sock->state == SS_READY) { |
1531 | res = -EOPNOTSUPP; | |
1532 | goto exit; | |
1533 | } | |
b89741a0 | 1534 | |
b89741a0 AS |
1535 | /* |
1536 | * Reject connection attempt using multicast address | |
1537 | * | |
1538 | * Note: send_msg() validates the rest of the address fields, | |
1539 | * so there's no need to do it here | |
1540 | */ | |
0c3141e9 AS |
1541 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1542 | res = -EINVAL; | |
1543 | goto exit; | |
1544 | } | |
1545 | ||
78eb3a53 | 1546 | previous = sock->state; |
584d24b3 YX |
1547 | switch (sock->state) { |
1548 | case SS_UNCONNECTED: | |
1549 | /* Send a 'SYN-' to destination */ | |
1550 | m.msg_name = dest; | |
1551 | m.msg_namelen = destlen; | |
1552 | ||
1553 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1554 | * indicate send_msg() is never blocked. | |
1555 | */ | |
1556 | if (!timeout) | |
1557 | m.msg_flags = MSG_DONTWAIT; | |
1558 | ||
1559 | res = send_msg(NULL, sock, &m, 0); | |
1560 | if ((res < 0) && (res != -EWOULDBLOCK)) | |
1561 | goto exit; | |
1562 | ||
1563 | /* Just entered SS_CONNECTING state; the only | |
1564 | * difference is that return value in non-blocking | |
1565 | * case is EINPROGRESS, rather than EALREADY. | |
1566 | */ | |
1567 | res = -EINPROGRESS; | |
584d24b3 | 1568 | case SS_CONNECTING: |
78eb3a53 YX |
1569 | if (previous == SS_CONNECTING) |
1570 | res = -EALREADY; | |
1571 | if (!timeout) | |
1572 | goto exit; | |
1573 | timeout = msecs_to_jiffies(timeout); | |
1574 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1575 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1576 | break; |
1577 | case SS_CONNECTED: | |
1578 | res = -EISCONN; | |
1579 | break; | |
1580 | default: | |
1581 | res = -EINVAL; | |
78eb3a53 | 1582 | break; |
b89741a0 | 1583 | } |
0c3141e9 AS |
1584 | exit: |
1585 | release_sock(sk); | |
b89741a0 | 1586 | return res; |
b97bf3fd PL |
1587 | } |
1588 | ||
c4307285 | 1589 | /** |
b97bf3fd PL |
1590 | * listen - allow socket to listen for incoming connections |
1591 | * @sock: socket structure | |
1592 | * @len: (unused) | |
c4307285 | 1593 | * |
b97bf3fd PL |
1594 | * Returns 0 on success, errno otherwise |
1595 | */ | |
b97bf3fd PL |
1596 | static int listen(struct socket *sock, int len) |
1597 | { | |
0c3141e9 AS |
1598 | struct sock *sk = sock->sk; |
1599 | int res; | |
1600 | ||
1601 | lock_sock(sk); | |
b97bf3fd | 1602 | |
245f3d34 | 1603 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1604 | res = -EINVAL; |
1605 | else { | |
1606 | sock->state = SS_LISTENING; | |
1607 | res = 0; | |
1608 | } | |
1609 | ||
1610 | release_sock(sk); | |
1611 | return res; | |
b97bf3fd PL |
1612 | } |
1613 | ||
6398e23c YX |
1614 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1615 | { | |
1616 | struct sock *sk = sock->sk; | |
1617 | DEFINE_WAIT(wait); | |
1618 | int err; | |
1619 | ||
1620 | /* True wake-one mechanism for incoming connections: only | |
1621 | * one process gets woken up, not the 'whole herd'. | |
1622 | * Since we do not 'race & poll' for established sockets | |
1623 | * anymore, the common case will execute the loop only once. | |
1624 | */ | |
1625 | for (;;) { | |
1626 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
1627 | TASK_INTERRUPTIBLE); | |
1628 | if (skb_queue_empty(&sk->sk_receive_queue)) { | |
1629 | release_sock(sk); | |
1630 | timeo = schedule_timeout(timeo); | |
1631 | lock_sock(sk); | |
1632 | } | |
1633 | err = 0; | |
1634 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1635 | break; | |
1636 | err = -EINVAL; | |
1637 | if (sock->state != SS_LISTENING) | |
1638 | break; | |
1639 | err = sock_intr_errno(timeo); | |
1640 | if (signal_pending(current)) | |
1641 | break; | |
1642 | err = -EAGAIN; | |
1643 | if (!timeo) | |
1644 | break; | |
1645 | } | |
1646 | finish_wait(sk_sleep(sk), &wait); | |
1647 | return err; | |
1648 | } | |
1649 | ||
c4307285 | 1650 | /** |
b97bf3fd PL |
1651 | * accept - wait for connection request |
1652 | * @sock: listening socket | |
1653 | * @newsock: new socket that is to be connected | |
1654 | * @flags: file-related flags associated with socket | |
c4307285 | 1655 | * |
b97bf3fd PL |
1656 | * Returns 0 on success, errno otherwise |
1657 | */ | |
0c3141e9 | 1658 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1659 | { |
0fef8f20 | 1660 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1661 | struct sk_buff *buf; |
0fef8f20 PG |
1662 | struct tipc_sock *new_tsock; |
1663 | struct tipc_port *new_tport; | |
1664 | struct tipc_msg *msg; | |
1665 | u32 new_ref; | |
6398e23c | 1666 | long timeo; |
0c3141e9 | 1667 | int res; |
b97bf3fd | 1668 | |
0c3141e9 | 1669 | lock_sock(sk); |
b97bf3fd | 1670 | |
0c3141e9 AS |
1671 | if (sock->state != SS_LISTENING) { |
1672 | res = -EINVAL; | |
b97bf3fd PL |
1673 | goto exit; |
1674 | } | |
b97bf3fd | 1675 | |
6398e23c YX |
1676 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1677 | res = tipc_wait_for_accept(sock, timeo); | |
1678 | if (res) | |
1679 | goto exit; | |
0c3141e9 AS |
1680 | |
1681 | buf = skb_peek(&sk->sk_receive_queue); | |
1682 | ||
c5fa7b3c | 1683 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1684 | if (res) |
1685 | goto exit; | |
b97bf3fd | 1686 | |
0fef8f20 PG |
1687 | new_sk = new_sock->sk; |
1688 | new_tsock = tipc_sk(new_sk); | |
1689 | new_tport = new_tsock->p; | |
1690 | new_ref = new_tport->ref; | |
1691 | msg = buf_msg(buf); | |
b97bf3fd | 1692 | |
0fef8f20 PG |
1693 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1694 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1695 | ||
1696 | /* | |
1697 | * Reject any stray messages received by new socket | |
1698 | * before the socket lock was taken (very, very unlikely) | |
1699 | */ | |
1700 | reject_rx_queue(new_sk); | |
1701 | ||
1702 | /* Connect new socket to it's peer */ | |
1703 | new_tsock->peer_name.ref = msg_origport(msg); | |
1704 | new_tsock->peer_name.node = msg_orignode(msg); | |
1705 | tipc_connect(new_ref, &new_tsock->peer_name); | |
1706 | new_sock->state = SS_CONNECTED; | |
1707 | ||
1708 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1709 | if (msg_named(msg)) { | |
1710 | new_tport->conn_type = msg_nametype(msg); | |
1711 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1712 | } |
0fef8f20 PG |
1713 | |
1714 | /* | |
1715 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1716 | * Respond to 'SYN+' by queuing it on new socket. | |
1717 | */ | |
1718 | if (!msg_data_sz(msg)) { | |
1719 | struct msghdr m = {NULL,}; | |
1720 | ||
1721 | advance_rx_queue(sk); | |
1722 | send_packet(NULL, new_sock, &m, 0); | |
1723 | } else { | |
1724 | __skb_dequeue(&sk->sk_receive_queue); | |
1725 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 1726 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
1727 | } |
1728 | release_sock(new_sk); | |
1729 | ||
b97bf3fd | 1730 | exit: |
0c3141e9 | 1731 | release_sock(sk); |
b97bf3fd PL |
1732 | return res; |
1733 | } | |
1734 | ||
1735 | /** | |
1736 | * shutdown - shutdown socket connection | |
1737 | * @sock: socket structure | |
e247a8f5 | 1738 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1739 | * |
1740 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1741 | * |
b97bf3fd PL |
1742 | * Returns 0 on success, errno otherwise |
1743 | */ | |
b97bf3fd PL |
1744 | static int shutdown(struct socket *sock, int how) |
1745 | { | |
0c3141e9 AS |
1746 | struct sock *sk = sock->sk; |
1747 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1748 | struct sk_buff *buf; |
1749 | int res; | |
1750 | ||
e247a8f5 AS |
1751 | if (how != SHUT_RDWR) |
1752 | return -EINVAL; | |
b97bf3fd | 1753 | |
0c3141e9 | 1754 | lock_sock(sk); |
b97bf3fd PL |
1755 | |
1756 | switch (sock->state) { | |
0c3141e9 | 1757 | case SS_CONNECTING: |
b97bf3fd PL |
1758 | case SS_CONNECTED: |
1759 | ||
b97bf3fd | 1760 | restart: |
617d3c7a | 1761 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1762 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1763 | if (buf) { | |
40682432 | 1764 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 1765 | kfree_skb(buf); |
b97bf3fd PL |
1766 | goto restart; |
1767 | } | |
0c3141e9 | 1768 | tipc_disconnect(tport->ref); |
b97bf3fd | 1769 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1770 | } else { |
1771 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1772 | } |
0c3141e9 AS |
1773 | |
1774 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1775 | |
1776 | /* fall through */ | |
1777 | ||
1778 | case SS_DISCONNECTING: | |
1779 | ||
75031151 | 1780 | /* Discard any unreceived messages */ |
57467e56 | 1781 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1782 | |
1783 | /* Wake up anyone sleeping in poll */ | |
1784 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1785 | res = 0; |
1786 | break; | |
1787 | ||
1788 | default: | |
1789 | res = -ENOTCONN; | |
1790 | } | |
1791 | ||
0c3141e9 | 1792 | release_sock(sk); |
b97bf3fd PL |
1793 | return res; |
1794 | } | |
1795 | ||
1796 | /** | |
1797 | * setsockopt - set socket option | |
1798 | * @sock: socket structure | |
1799 | * @lvl: option level | |
1800 | * @opt: option identifier | |
1801 | * @ov: pointer to new option value | |
1802 | * @ol: length of option value | |
c4307285 YH |
1803 | * |
1804 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1805 | * (to ease compatibility). |
c4307285 | 1806 | * |
b97bf3fd PL |
1807 | * Returns 0 on success, errno otherwise |
1808 | */ | |
ae8509c4 PG |
1809 | static int setsockopt(struct socket *sock, int lvl, int opt, char __user *ov, |
1810 | unsigned int ol) | |
b97bf3fd | 1811 | { |
0c3141e9 AS |
1812 | struct sock *sk = sock->sk; |
1813 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1814 | u32 value; |
1815 | int res; | |
1816 | ||
c4307285 YH |
1817 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1818 | return 0; | |
b97bf3fd PL |
1819 | if (lvl != SOL_TIPC) |
1820 | return -ENOPROTOOPT; | |
1821 | if (ol < sizeof(value)) | |
1822 | return -EINVAL; | |
2db9983a AS |
1823 | res = get_user(value, (u32 __user *)ov); |
1824 | if (res) | |
b97bf3fd PL |
1825 | return res; |
1826 | ||
0c3141e9 | 1827 | lock_sock(sk); |
c4307285 | 1828 | |
b97bf3fd PL |
1829 | switch (opt) { |
1830 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1831 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1832 | break; |
1833 | case TIPC_SRC_DROPPABLE: | |
1834 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1835 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1836 | else |
b97bf3fd PL |
1837 | res = -ENOPROTOOPT; |
1838 | break; | |
1839 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1840 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1841 | break; |
1842 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1843 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 1844 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1845 | break; |
1846 | default: | |
1847 | res = -EINVAL; | |
1848 | } | |
1849 | ||
0c3141e9 AS |
1850 | release_sock(sk); |
1851 | ||
b97bf3fd PL |
1852 | return res; |
1853 | } | |
1854 | ||
1855 | /** | |
1856 | * getsockopt - get socket option | |
1857 | * @sock: socket structure | |
1858 | * @lvl: option level | |
1859 | * @opt: option identifier | |
1860 | * @ov: receptacle for option value | |
1861 | * @ol: receptacle for length of option value | |
c4307285 YH |
1862 | * |
1863 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1864 | * (to ease compatibility). |
c4307285 | 1865 | * |
b97bf3fd PL |
1866 | * Returns 0 on success, errno otherwise |
1867 | */ | |
ae8509c4 PG |
1868 | static int getsockopt(struct socket *sock, int lvl, int opt, char __user *ov, |
1869 | int __user *ol) | |
b97bf3fd | 1870 | { |
0c3141e9 AS |
1871 | struct sock *sk = sock->sk; |
1872 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1873 | int len; |
b97bf3fd | 1874 | u32 value; |
c4307285 | 1875 | int res; |
b97bf3fd | 1876 | |
c4307285 YH |
1877 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1878 | return put_user(0, ol); | |
b97bf3fd PL |
1879 | if (lvl != SOL_TIPC) |
1880 | return -ENOPROTOOPT; | |
2db9983a AS |
1881 | res = get_user(len, ol); |
1882 | if (res) | |
c4307285 | 1883 | return res; |
b97bf3fd | 1884 | |
0c3141e9 | 1885 | lock_sock(sk); |
b97bf3fd PL |
1886 | |
1887 | switch (opt) { | |
1888 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1889 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1890 | break; |
1891 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1892 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1893 | break; |
1894 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1895 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1896 | break; |
1897 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1898 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1899 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1900 | break; |
0e65967e | 1901 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 1902 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 1903 | break; |
0e65967e | 1904 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1905 | value = skb_queue_len(&sk->sk_receive_queue); |
1906 | break; | |
b97bf3fd PL |
1907 | default: |
1908 | res = -EINVAL; | |
1909 | } | |
1910 | ||
0c3141e9 AS |
1911 | release_sock(sk); |
1912 | ||
25860c3b PG |
1913 | if (res) |
1914 | return res; /* "get" failed */ | |
b97bf3fd | 1915 | |
25860c3b PG |
1916 | if (len < sizeof(value)) |
1917 | return -EINVAL; | |
1918 | ||
1919 | if (copy_to_user(ov, &value, sizeof(value))) | |
1920 | return -EFAULT; | |
1921 | ||
1922 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1923 | } |
1924 | ||
ae86b9e3 BH |
1925 | /* Protocol switches for the various types of TIPC sockets */ |
1926 | ||
bca65eae | 1927 | static const struct proto_ops msg_ops = { |
0e65967e | 1928 | .owner = THIS_MODULE, |
b97bf3fd PL |
1929 | .family = AF_TIPC, |
1930 | .release = release, | |
1931 | .bind = bind, | |
1932 | .connect = connect, | |
5eee6a6d | 1933 | .socketpair = sock_no_socketpair, |
245f3d34 | 1934 | .accept = sock_no_accept, |
b97bf3fd PL |
1935 | .getname = get_name, |
1936 | .poll = poll, | |
5eee6a6d | 1937 | .ioctl = sock_no_ioctl, |
245f3d34 | 1938 | .listen = sock_no_listen, |
b97bf3fd PL |
1939 | .shutdown = shutdown, |
1940 | .setsockopt = setsockopt, | |
1941 | .getsockopt = getsockopt, | |
1942 | .sendmsg = send_msg, | |
1943 | .recvmsg = recv_msg, | |
8238745a YH |
1944 | .mmap = sock_no_mmap, |
1945 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1946 | }; |
1947 | ||
bca65eae | 1948 | static const struct proto_ops packet_ops = { |
0e65967e | 1949 | .owner = THIS_MODULE, |
b97bf3fd PL |
1950 | .family = AF_TIPC, |
1951 | .release = release, | |
1952 | .bind = bind, | |
1953 | .connect = connect, | |
5eee6a6d | 1954 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1955 | .accept = accept, |
1956 | .getname = get_name, | |
1957 | .poll = poll, | |
5eee6a6d | 1958 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1959 | .listen = listen, |
1960 | .shutdown = shutdown, | |
1961 | .setsockopt = setsockopt, | |
1962 | .getsockopt = getsockopt, | |
1963 | .sendmsg = send_packet, | |
1964 | .recvmsg = recv_msg, | |
8238745a YH |
1965 | .mmap = sock_no_mmap, |
1966 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1967 | }; |
1968 | ||
bca65eae | 1969 | static const struct proto_ops stream_ops = { |
0e65967e | 1970 | .owner = THIS_MODULE, |
b97bf3fd PL |
1971 | .family = AF_TIPC, |
1972 | .release = release, | |
1973 | .bind = bind, | |
1974 | .connect = connect, | |
5eee6a6d | 1975 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1976 | .accept = accept, |
1977 | .getname = get_name, | |
1978 | .poll = poll, | |
5eee6a6d | 1979 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1980 | .listen = listen, |
1981 | .shutdown = shutdown, | |
1982 | .setsockopt = setsockopt, | |
1983 | .getsockopt = getsockopt, | |
1984 | .sendmsg = send_stream, | |
1985 | .recvmsg = recv_stream, | |
8238745a YH |
1986 | .mmap = sock_no_mmap, |
1987 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1988 | }; |
1989 | ||
bca65eae | 1990 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 1991 | .owner = THIS_MODULE, |
b97bf3fd | 1992 | .family = AF_TIPC, |
c5fa7b3c | 1993 | .create = tipc_sk_create |
b97bf3fd PL |
1994 | }; |
1995 | ||
1996 | static struct proto tipc_proto = { | |
1997 | .name = "TIPC", | |
1998 | .owner = THIS_MODULE, | |
cc79dd1b YX |
1999 | .obj_size = sizeof(struct tipc_sock), |
2000 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
2001 | }; |
2002 | ||
c5fa7b3c YX |
2003 | static struct proto tipc_proto_kern = { |
2004 | .name = "TIPC", | |
2005 | .obj_size = sizeof(struct tipc_sock), | |
2006 | .sysctl_rmem = sysctl_tipc_rmem | |
2007 | }; | |
2008 | ||
b97bf3fd | 2009 | /** |
4323add6 | 2010 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2011 | * |
b97bf3fd PL |
2012 | * Returns 0 on success, errno otherwise |
2013 | */ | |
4323add6 | 2014 | int tipc_socket_init(void) |
b97bf3fd PL |
2015 | { |
2016 | int res; | |
2017 | ||
c4307285 | 2018 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2019 | if (res) { |
2cf8aa19 | 2020 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2021 | goto out; |
2022 | } | |
2023 | ||
2024 | res = sock_register(&tipc_family_ops); | |
2025 | if (res) { | |
2cf8aa19 | 2026 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2027 | proto_unregister(&tipc_proto); |
2028 | goto out; | |
2029 | } | |
2030 | ||
2031 | sockets_enabled = 1; | |
2032 | out: | |
2033 | return res; | |
2034 | } | |
2035 | ||
2036 | /** | |
4323add6 | 2037 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2038 | */ |
4323add6 | 2039 | void tipc_socket_stop(void) |
b97bf3fd PL |
2040 | { |
2041 | if (!sockets_enabled) | |
2042 | return; | |
2043 | ||
2044 | sockets_enabled = 0; | |
2045 | sock_unregister(tipc_family_ops.family); | |
2046 | proto_unregister(&tipc_proto); | |
2047 | } |