Commit | Line | Data |
---|---|---|
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 | |
c4307285 | 73 | /* |
0c3141e9 AS |
74 | * Revised TIPC socket locking policy: |
75 | * | |
76 | * Most socket operations take the standard socket lock when they start | |
77 | * and hold it until they finish (or until they need to sleep). Acquiring | |
78 | * this lock grants the owner exclusive access to the fields of the socket | |
79 | * data structures, with the exception of the backlog queue. A few socket | |
80 | * operations can be done without taking the socket lock because they only | |
81 | * read socket information that never changes during the life of the socket. | |
82 | * | |
83 | * Socket operations may acquire the lock for the associated TIPC port if they | |
84 | * need to perform an operation on the port. If any routine needs to acquire | |
85 | * both the socket lock and the port lock it must take the socket lock first | |
86 | * to avoid the risk of deadlock. | |
87 | * | |
88 | * The dispatcher handling incoming messages cannot grab the socket lock in | |
89 | * the standard fashion, since invoked it runs at the BH level and cannot block. | |
90 | * Instead, it checks to see if the socket lock is currently owned by someone, | |
91 | * and either handles the message itself or adds it to the socket's backlog | |
92 | * queue; in the latter case the queued message is processed once the process | |
93 | * owning the socket lock releases it. | |
94 | * | |
95 | * NOTE: Releasing the socket lock while an operation is sleeping overcomes | |
96 | * the problem of a blocked socket operation preventing any other operations | |
97 | * from occurring. However, applications must be careful if they have | |
98 | * multiple threads trying to send (or receive) on the same socket, as these | |
99 | * operations might interfere with each other. For example, doing a connect | |
100 | * and a receive at the same time might allow the receive to consume the | |
101 | * ACK message meant for the connect. While additional work could be done | |
102 | * to try and overcome this, it doesn't seem to be worthwhile at the present. | |
103 | * | |
104 | * NOTE: Releasing the socket lock while an operation is sleeping also ensures | |
105 | * that another operation that must be performed in a non-blocking manner is | |
106 | * not delayed for very long because the lock has already been taken. | |
107 | * | |
108 | * NOTE: This code assumes that certain fields of a port/socket pair are | |
109 | * constant over its lifetime; such fields can be examined without taking | |
110 | * the socket lock and/or port lock, and do not need to be re-read even | |
111 | * after resuming processing after waiting. These fields include: | |
112 | * - socket type | |
113 | * - pointer to socket sk structure (aka tipc_sock structure) | |
114 | * - pointer to port structure | |
115 | * - port reference | |
116 | */ | |
117 | ||
118 | /** | |
119 | * advance_rx_queue - discard first buffer in socket receive queue | |
120 | * | |
121 | * Caller must hold socket lock | |
b97bf3fd | 122 | */ |
0c3141e9 | 123 | static void advance_rx_queue(struct sock *sk) |
b97bf3fd | 124 | { |
5f6d9123 | 125 | kfree_skb(__skb_dequeue(&sk->sk_receive_queue)); |
b97bf3fd PL |
126 | } |
127 | ||
b97bf3fd | 128 | /** |
0c3141e9 AS |
129 | * reject_rx_queue - reject all buffers in socket receive queue |
130 | * | |
131 | * Caller must hold socket lock | |
b97bf3fd | 132 | */ |
0c3141e9 | 133 | static void reject_rx_queue(struct sock *sk) |
b97bf3fd | 134 | { |
0c3141e9 AS |
135 | struct sk_buff *buf; |
136 | ||
9da3d475 | 137 | while ((buf = __skb_dequeue(&sk->sk_receive_queue))) |
0c3141e9 | 138 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
b97bf3fd PL |
139 | } |
140 | ||
141 | /** | |
c5fa7b3c | 142 | * tipc_sk_create - create a TIPC socket |
0c3141e9 | 143 | * @net: network namespace (must be default network) |
b97bf3fd PL |
144 | * @sock: pre-allocated socket structure |
145 | * @protocol: protocol indicator (must be 0) | |
3f378b68 | 146 | * @kern: caused by kernel or by userspace? |
c4307285 | 147 | * |
0c3141e9 AS |
148 | * This routine creates additional data structures used by the TIPC socket, |
149 | * initializes them, and links them together. | |
b97bf3fd PL |
150 | * |
151 | * Returns 0 on success, errno otherwise | |
152 | */ | |
c5fa7b3c YX |
153 | static int tipc_sk_create(struct net *net, struct socket *sock, int protocol, |
154 | int kern) | |
b97bf3fd | 155 | { |
0c3141e9 AS |
156 | const struct proto_ops *ops; |
157 | socket_state state; | |
b97bf3fd | 158 | struct sock *sk; |
7ef43eba | 159 | struct tipc_port *tp_ptr; |
0c3141e9 AS |
160 | |
161 | /* Validate arguments */ | |
b97bf3fd PL |
162 | if (unlikely(protocol != 0)) |
163 | return -EPROTONOSUPPORT; | |
164 | ||
b97bf3fd PL |
165 | switch (sock->type) { |
166 | case SOCK_STREAM: | |
0c3141e9 AS |
167 | ops = &stream_ops; |
168 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
169 | break; |
170 | case SOCK_SEQPACKET: | |
0c3141e9 AS |
171 | ops = &packet_ops; |
172 | state = SS_UNCONNECTED; | |
b97bf3fd PL |
173 | break; |
174 | case SOCK_DGRAM: | |
b97bf3fd | 175 | case SOCK_RDM: |
0c3141e9 AS |
176 | ops = &msg_ops; |
177 | state = SS_READY; | |
b97bf3fd | 178 | break; |
49978651 | 179 | default: |
49978651 | 180 | return -EPROTOTYPE; |
b97bf3fd PL |
181 | } |
182 | ||
0c3141e9 | 183 | /* Allocate socket's protocol area */ |
c5fa7b3c YX |
184 | if (!kern) |
185 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto); | |
186 | else | |
187 | sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern); | |
188 | ||
0c3141e9 | 189 | if (sk == NULL) |
b97bf3fd | 190 | return -ENOMEM; |
b97bf3fd | 191 | |
0c3141e9 | 192 | /* Allocate TIPC port for socket to use */ |
3c5db8e4 YX |
193 | tp_ptr = tipc_createport(sk, &dispatch, &wakeupdispatch, |
194 | TIPC_LOW_IMPORTANCE); | |
0ea52241 | 195 | if (unlikely(!tp_ptr)) { |
0c3141e9 AS |
196 | sk_free(sk); |
197 | return -ENOMEM; | |
198 | } | |
b97bf3fd | 199 | |
0c3141e9 | 200 | /* Finish initializing socket data structures */ |
0c3141e9 AS |
201 | sock->ops = ops; |
202 | sock->state = state; | |
b97bf3fd | 203 | |
0c3141e9 | 204 | sock_init_data(sock, sk); |
0c3141e9 | 205 | sk->sk_backlog_rcv = backlog_rcv; |
cc79dd1b | 206 | sk->sk_rcvbuf = sysctl_tipc_rmem[1]; |
f288bef4 YX |
207 | sk->sk_data_ready = tipc_data_ready; |
208 | sk->sk_write_space = tipc_write_space; | |
0ea52241 | 209 | tipc_sk(sk)->p = tp_ptr; |
a0f40f02 | 210 | tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT; |
b97bf3fd | 211 | |
7ef43eba AS |
212 | spin_unlock_bh(tp_ptr->lock); |
213 | ||
0c3141e9 | 214 | if (sock->state == SS_READY) { |
0ea52241 | 215 | tipc_set_portunreturnable(tp_ptr->ref, 1); |
0c3141e9 | 216 | if (sock->type == SOCK_DGRAM) |
0ea52241 | 217 | tipc_set_portunreliable(tp_ptr->ref, 1); |
0c3141e9 | 218 | } |
b97bf3fd PL |
219 | |
220 | return 0; | |
221 | } | |
222 | ||
c5fa7b3c YX |
223 | /** |
224 | * tipc_sock_create_local - create TIPC socket from inside TIPC module | |
225 | * @type: socket type - SOCK_RDM or SOCK_SEQPACKET | |
226 | * | |
227 | * We cannot use sock_creat_kern here because it bumps module user count. | |
228 | * Since socket owner and creator is the same module we must make sure | |
229 | * that module count remains zero for module local sockets, otherwise | |
230 | * we cannot do rmmod. | |
231 | * | |
232 | * Returns 0 on success, errno otherwise | |
233 | */ | |
234 | int tipc_sock_create_local(int type, struct socket **res) | |
235 | { | |
236 | int rc; | |
c5fa7b3c YX |
237 | |
238 | rc = sock_create_lite(AF_TIPC, type, 0, res); | |
239 | if (rc < 0) { | |
240 | pr_err("Failed to create kernel socket\n"); | |
241 | return rc; | |
242 | } | |
243 | tipc_sk_create(&init_net, *res, 0, 1); | |
244 | ||
c5fa7b3c YX |
245 | return 0; |
246 | } | |
247 | ||
248 | /** | |
249 | * tipc_sock_release_local - release socket created by tipc_sock_create_local | |
250 | * @sock: the socket to be released. | |
251 | * | |
252 | * Module reference count is not incremented when such sockets are created, | |
253 | * so we must keep it from being decremented when they are released. | |
254 | */ | |
255 | void tipc_sock_release_local(struct socket *sock) | |
256 | { | |
257 | release(sock); | |
258 | sock->ops = NULL; | |
259 | sock_release(sock); | |
260 | } | |
261 | ||
262 | /** | |
263 | * tipc_sock_accept_local - accept a connection on a socket created | |
264 | * with tipc_sock_create_local. Use this function to avoid that | |
265 | * module reference count is inadvertently incremented. | |
266 | * | |
267 | * @sock: the accepting socket | |
268 | * @newsock: reference to the new socket to be created | |
269 | * @flags: socket flags | |
270 | */ | |
271 | ||
272 | int tipc_sock_accept_local(struct socket *sock, struct socket **newsock, | |
ae8509c4 | 273 | int flags) |
c5fa7b3c YX |
274 | { |
275 | struct sock *sk = sock->sk; | |
276 | int ret; | |
277 | ||
278 | ret = sock_create_lite(sk->sk_family, sk->sk_type, | |
279 | sk->sk_protocol, newsock); | |
280 | if (ret < 0) | |
281 | return ret; | |
282 | ||
283 | ret = accept(sock, *newsock, flags); | |
284 | if (ret < 0) { | |
285 | sock_release(*newsock); | |
286 | return ret; | |
287 | } | |
288 | (*newsock)->ops = sock->ops; | |
289 | return ret; | |
290 | } | |
291 | ||
b97bf3fd PL |
292 | /** |
293 | * release - destroy a TIPC socket | |
294 | * @sock: socket to destroy | |
295 | * | |
296 | * This routine cleans up any messages that are still queued on the socket. | |
297 | * For DGRAM and RDM socket types, all queued messages are rejected. | |
298 | * For SEQPACKET and STREAM socket types, the first message is rejected | |
299 | * and any others are discarded. (If the first message on a STREAM socket | |
300 | * is partially-read, it is discarded and the next one is rejected instead.) | |
c4307285 | 301 | * |
b97bf3fd PL |
302 | * NOTE: Rejected messages are not necessarily returned to the sender! They |
303 | * are returned or discarded according to the "destination droppable" setting | |
304 | * specified for the message by the sender. | |
305 | * | |
306 | * Returns 0 on success, errno otherwise | |
307 | */ | |
b97bf3fd PL |
308 | static int release(struct socket *sock) |
309 | { | |
b97bf3fd | 310 | struct sock *sk = sock->sk; |
0c3141e9 | 311 | struct tipc_port *tport; |
b97bf3fd | 312 | struct sk_buff *buf; |
0c3141e9 | 313 | int res; |
b97bf3fd | 314 | |
0c3141e9 AS |
315 | /* |
316 | * Exit if socket isn't fully initialized (occurs when a failed accept() | |
317 | * releases a pre-allocated child socket that was never used) | |
318 | */ | |
0c3141e9 | 319 | if (sk == NULL) |
b97bf3fd | 320 | return 0; |
c4307285 | 321 | |
0c3141e9 AS |
322 | tport = tipc_sk_port(sk); |
323 | lock_sock(sk); | |
324 | ||
325 | /* | |
326 | * Reject all unreceived messages, except on an active connection | |
327 | * (which disconnects locally & sends a 'FIN+' to peer) | |
328 | */ | |
b97bf3fd | 329 | while (sock->state != SS_DISCONNECTING) { |
0c3141e9 AS |
330 | buf = __skb_dequeue(&sk->sk_receive_queue); |
331 | if (buf == NULL) | |
b97bf3fd | 332 | break; |
40682432 | 333 | if (TIPC_SKB_CB(buf)->handle != NULL) |
5f6d9123 | 334 | kfree_skb(buf); |
0c3141e9 AS |
335 | else { |
336 | if ((sock->state == SS_CONNECTING) || | |
337 | (sock->state == SS_CONNECTED)) { | |
338 | sock->state = SS_DISCONNECTING; | |
339 | tipc_disconnect(tport->ref); | |
340 | } | |
b97bf3fd | 341 | tipc_reject_msg(buf, TIPC_ERR_NO_PORT); |
0c3141e9 | 342 | } |
b97bf3fd PL |
343 | } |
344 | ||
0c3141e9 AS |
345 | /* |
346 | * Delete TIPC port; this ensures no more messages are queued | |
347 | * (also disconnects an active connection & sends a 'FIN-' to peer) | |
348 | */ | |
84602761 | 349 | res = tipc_deleteport(tport); |
b97bf3fd | 350 | |
0c3141e9 | 351 | /* Discard any remaining (connection-based) messages in receive queue */ |
57467e56 | 352 | __skb_queue_purge(&sk->sk_receive_queue); |
b97bf3fd | 353 | |
0c3141e9 | 354 | /* Reject any messages that accumulated in backlog queue */ |
0c3141e9 AS |
355 | sock->state = SS_DISCONNECTING; |
356 | release_sock(sk); | |
b97bf3fd PL |
357 | |
358 | sock_put(sk); | |
0c3141e9 | 359 | sock->sk = NULL; |
b97bf3fd | 360 | |
b97bf3fd PL |
361 | return res; |
362 | } | |
363 | ||
364 | /** | |
365 | * bind - associate or disassocate TIPC name(s) with a socket | |
366 | * @sock: socket structure | |
367 | * @uaddr: socket address describing name(s) and desired operation | |
368 | * @uaddr_len: size of socket address data structure | |
c4307285 | 369 | * |
b97bf3fd PL |
370 | * Name and name sequence binding is indicated using a positive scope value; |
371 | * a negative scope value unbinds the specified name. Specifying no name | |
372 | * (i.e. a socket address length of 0) unbinds all names from the socket. | |
c4307285 | 373 | * |
b97bf3fd | 374 | * Returns 0 on success, errno otherwise |
0c3141e9 AS |
375 | * |
376 | * NOTE: This routine doesn't need to take the socket lock since it doesn't | |
377 | * access any non-constant socket information. | |
b97bf3fd | 378 | */ |
b97bf3fd PL |
379 | static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len) |
380 | { | |
84602761 | 381 | struct sock *sk = sock->sk; |
b97bf3fd | 382 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
84602761 YX |
383 | struct tipc_port *tport = tipc_sk_port(sock->sk); |
384 | int res = -EINVAL; | |
b97bf3fd | 385 | |
84602761 YX |
386 | lock_sock(sk); |
387 | if (unlikely(!uaddr_len)) { | |
388 | res = tipc_withdraw(tport, 0, NULL); | |
389 | goto exit; | |
390 | } | |
c4307285 | 391 | |
84602761 YX |
392 | if (uaddr_len < sizeof(struct sockaddr_tipc)) { |
393 | res = -EINVAL; | |
394 | goto exit; | |
395 | } | |
396 | if (addr->family != AF_TIPC) { | |
397 | res = -EAFNOSUPPORT; | |
398 | goto exit; | |
399 | } | |
b97bf3fd | 400 | |
b97bf3fd PL |
401 | if (addr->addrtype == TIPC_ADDR_NAME) |
402 | addr->addr.nameseq.upper = addr->addr.nameseq.lower; | |
84602761 YX |
403 | else if (addr->addrtype != TIPC_ADDR_NAMESEQ) { |
404 | res = -EAFNOSUPPORT; | |
405 | goto exit; | |
406 | } | |
c4307285 | 407 | |
13a2e898 | 408 | if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) && |
7d0ab17b | 409 | (addr->addr.nameseq.type != TIPC_TOP_SRV) && |
84602761 YX |
410 | (addr->addr.nameseq.type != TIPC_CFG_SRV)) { |
411 | res = -EACCES; | |
412 | goto exit; | |
413 | } | |
c422f1bd | 414 | |
84602761 YX |
415 | res = (addr->scope > 0) ? |
416 | tipc_publish(tport, addr->scope, &addr->addr.nameseq) : | |
417 | tipc_withdraw(tport, -addr->scope, &addr->addr.nameseq); | |
418 | exit: | |
419 | release_sock(sk); | |
420 | return res; | |
b97bf3fd PL |
421 | } |
422 | ||
c4307285 | 423 | /** |
b97bf3fd PL |
424 | * get_name - get port ID of socket or peer socket |
425 | * @sock: socket structure | |
426 | * @uaddr: area for returned socket address | |
427 | * @uaddr_len: area for returned length of socket address | |
2da59918 | 428 | * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID |
c4307285 | 429 | * |
b97bf3fd | 430 | * Returns 0 on success, errno otherwise |
0c3141e9 | 431 | * |
2da59918 AS |
432 | * NOTE: This routine doesn't need to take the socket lock since it only |
433 | * accesses socket information that is unchanging (or which changes in | |
0e65967e | 434 | * a completely predictable manner). |
b97bf3fd | 435 | */ |
c4307285 | 436 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
437 | int *uaddr_len, int peer) |
438 | { | |
b97bf3fd | 439 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr; |
2da59918 | 440 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
b97bf3fd | 441 | |
88f8a5e3 | 442 | memset(addr, 0, sizeof(*addr)); |
0c3141e9 | 443 | if (peer) { |
2da59918 AS |
444 | if ((sock->state != SS_CONNECTED) && |
445 | ((peer != 2) || (sock->state != SS_DISCONNECTING))) | |
446 | return -ENOTCONN; | |
447 | addr->addr.id.ref = tsock->peer_name.ref; | |
448 | addr->addr.id.node = tsock->peer_name.node; | |
0c3141e9 | 449 | } else { |
b924dcf0 AS |
450 | addr->addr.id.ref = tsock->p->ref; |
451 | addr->addr.id.node = tipc_own_addr; | |
0c3141e9 | 452 | } |
b97bf3fd PL |
453 | |
454 | *uaddr_len = sizeof(*addr); | |
455 | addr->addrtype = TIPC_ADDR_ID; | |
456 | addr->family = AF_TIPC; | |
457 | addr->scope = 0; | |
b97bf3fd PL |
458 | addr->addr.name.domain = 0; |
459 | ||
0c3141e9 | 460 | return 0; |
b97bf3fd PL |
461 | } |
462 | ||
463 | /** | |
464 | * poll - read and possibly block on pollmask | |
465 | * @file: file structure associated with the socket | |
466 | * @sock: socket for which to calculate the poll bits | |
467 | * @wait: ??? | |
468 | * | |
9b674e82 AS |
469 | * Returns pollmask value |
470 | * | |
471 | * COMMENTARY: | |
472 | * It appears that the usual socket locking mechanisms are not useful here | |
473 | * since the pollmask info is potentially out-of-date the moment this routine | |
474 | * exits. TCP and other protocols seem to rely on higher level poll routines | |
475 | * to handle any preventable race conditions, so TIPC will do the same ... | |
476 | * | |
477 | * TIPC sets the returned events as follows: | |
f662c070 AS |
478 | * |
479 | * socket state flags set | |
480 | * ------------ --------- | |
481 | * unconnected no read flags | |
c4fc298a | 482 | * POLLOUT if port is not congested |
f662c070 AS |
483 | * |
484 | * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue | |
485 | * no write flags | |
486 | * | |
487 | * connected POLLIN/POLLRDNORM if data in rx queue | |
488 | * POLLOUT if port is not congested | |
489 | * | |
490 | * disconnecting POLLIN/POLLRDNORM/POLLHUP | |
491 | * no write flags | |
492 | * | |
493 | * listening POLLIN if SYN in rx queue | |
494 | * no write flags | |
495 | * | |
496 | * ready POLLIN/POLLRDNORM if data in rx queue | |
497 | * [connectionless] POLLOUT (since port cannot be congested) | |
498 | * | |
499 | * IMPORTANT: The fact that a read or write operation is indicated does NOT | |
500 | * imply that the operation will succeed, merely that it should be performed | |
501 | * and will not block. | |
b97bf3fd | 502 | */ |
c4307285 | 503 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
504 | poll_table *wait) |
505 | { | |
9b674e82 | 506 | struct sock *sk = sock->sk; |
f662c070 | 507 | u32 mask = 0; |
9b674e82 | 508 | |
f288bef4 | 509 | sock_poll_wait(file, sk_sleep(sk), wait); |
9b674e82 | 510 | |
f662c070 | 511 | switch ((int)sock->state) { |
c4fc298a EH |
512 | case SS_UNCONNECTED: |
513 | if (!tipc_sk_port(sk)->congested) | |
514 | mask |= POLLOUT; | |
515 | break; | |
f662c070 AS |
516 | case SS_READY: |
517 | case SS_CONNECTED: | |
518 | if (!tipc_sk_port(sk)->congested) | |
519 | mask |= POLLOUT; | |
520 | /* fall thru' */ | |
521 | case SS_CONNECTING: | |
522 | case SS_LISTENING: | |
523 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
524 | mask |= (POLLIN | POLLRDNORM); | |
525 | break; | |
526 | case SS_DISCONNECTING: | |
527 | mask = (POLLIN | POLLRDNORM | POLLHUP); | |
528 | break; | |
529 | } | |
9b674e82 AS |
530 | |
531 | return mask; | |
b97bf3fd PL |
532 | } |
533 | ||
c4307285 | 534 | /** |
b97bf3fd PL |
535 | * dest_name_check - verify user is permitted to send to specified port name |
536 | * @dest: destination address | |
537 | * @m: descriptor for message to be sent | |
c4307285 | 538 | * |
b97bf3fd PL |
539 | * Prevents restricted configuration commands from being issued by |
540 | * unauthorized users. | |
c4307285 | 541 | * |
b97bf3fd PL |
542 | * Returns 0 if permission is granted, otherwise errno |
543 | */ | |
05790c64 | 544 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
545 | { |
546 | struct tipc_cfg_msg_hdr hdr; | |
547 | ||
c4307285 YH |
548 | if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES)) |
549 | return 0; | |
550 | if (likely(dest->addr.name.name.type == TIPC_TOP_SRV)) | |
551 | return 0; | |
c4307285 YH |
552 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
553 | return -EACCES; | |
b97bf3fd | 554 | |
3f8dd944 AS |
555 | if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr))) |
556 | return -EMSGSIZE; | |
c4307285 | 557 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 558 | return -EFAULT; |
70cb2347 | 559 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 560 | return -EACCES; |
c4307285 | 561 | |
b97bf3fd PL |
562 | return 0; |
563 | } | |
564 | ||
3f40504f YX |
565 | static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p) |
566 | { | |
567 | struct sock *sk = sock->sk; | |
568 | struct tipc_port *tport = tipc_sk_port(sk); | |
569 | DEFINE_WAIT(wait); | |
570 | int done; | |
571 | ||
572 | do { | |
573 | int err = sock_error(sk); | |
574 | if (err) | |
575 | return err; | |
576 | if (sock->state == SS_DISCONNECTING) | |
577 | return -EPIPE; | |
578 | if (!*timeo_p) | |
579 | return -EAGAIN; | |
580 | if (signal_pending(current)) | |
581 | return sock_intr_errno(*timeo_p); | |
582 | ||
583 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
584 | done = sk_wait_event(sk, timeo_p, !tport->congested); | |
585 | finish_wait(sk_sleep(sk), &wait); | |
586 | } while (!done); | |
587 | return 0; | |
588 | } | |
589 | ||
b97bf3fd PL |
590 | /** |
591 | * send_msg - send message in connectionless manner | |
0c3141e9 | 592 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
593 | * @sock: socket structure |
594 | * @m: message to send | |
e9024f0f | 595 | * @total_len: length of message |
c4307285 | 596 | * |
b97bf3fd | 597 | * Message must have an destination specified explicitly. |
c4307285 | 598 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
599 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
600 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 601 | * |
b97bf3fd PL |
602 | * Returns the number of bytes sent on success, or errno otherwise |
603 | */ | |
b97bf3fd PL |
604 | static int send_msg(struct kiocb *iocb, struct socket *sock, |
605 | struct msghdr *m, size_t total_len) | |
606 | { | |
0c3141e9 AS |
607 | struct sock *sk = sock->sk; |
608 | struct tipc_port *tport = tipc_sk_port(sk); | |
342dfc30 | 609 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
b97bf3fd | 610 | int needs_conn; |
3f40504f | 611 | long timeo; |
b97bf3fd PL |
612 | int res = -EINVAL; |
613 | ||
614 | if (unlikely(!dest)) | |
615 | return -EDESTADDRREQ; | |
51f9cc1f AS |
616 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
617 | (dest->family != AF_TIPC))) | |
b97bf3fd | 618 | return -EINVAL; |
97f8b87e | 619 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 | 620 | return -EMSGSIZE; |
b97bf3fd | 621 | |
0c3141e9 AS |
622 | if (iocb) |
623 | lock_sock(sk); | |
624 | ||
b97bf3fd PL |
625 | needs_conn = (sock->state != SS_READY); |
626 | if (unlikely(needs_conn)) { | |
0c3141e9 AS |
627 | if (sock->state == SS_LISTENING) { |
628 | res = -EPIPE; | |
629 | goto exit; | |
630 | } | |
631 | if (sock->state != SS_UNCONNECTED) { | |
632 | res = -EISCONN; | |
633 | goto exit; | |
634 | } | |
5d21cb70 | 635 | if (tport->published) { |
0c3141e9 AS |
636 | res = -EOPNOTSUPP; |
637 | goto exit; | |
638 | } | |
3388007b | 639 | if (dest->addrtype == TIPC_ADDR_NAME) { |
0c3141e9 AS |
640 | tport->conn_type = dest->addr.name.name.type; |
641 | tport->conn_instance = dest->addr.name.name.instance; | |
3388007b | 642 | } |
b97bf3fd PL |
643 | |
644 | /* Abort any pending connection attempts (very unlikely) */ | |
0c3141e9 | 645 | reject_rx_queue(sk); |
b97bf3fd PL |
646 | } |
647 | ||
3f40504f | 648 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
c4307285 YH |
649 | do { |
650 | if (dest->addrtype == TIPC_ADDR_NAME) { | |
2db9983a AS |
651 | res = dest_name_check(dest, m); |
652 | if (res) | |
0c3141e9 AS |
653 | break; |
654 | res = tipc_send2name(tport->ref, | |
c4307285 YH |
655 | &dest->addr.name.name, |
656 | dest->addr.name.domain, | |
26896904 AS |
657 | m->msg_iov, |
658 | total_len); | |
0e65967e | 659 | } else if (dest->addrtype == TIPC_ADDR_ID) { |
0c3141e9 | 660 | res = tipc_send2port(tport->ref, |
c4307285 | 661 | &dest->addr.id, |
26896904 AS |
662 | m->msg_iov, |
663 | total_len); | |
0e65967e | 664 | } else if (dest->addrtype == TIPC_ADDR_MCAST) { |
b97bf3fd PL |
665 | if (needs_conn) { |
666 | res = -EOPNOTSUPP; | |
0c3141e9 | 667 | break; |
b97bf3fd | 668 | } |
2db9983a AS |
669 | res = dest_name_check(dest, m); |
670 | if (res) | |
0c3141e9 AS |
671 | break; |
672 | res = tipc_multicast(tport->ref, | |
c4307285 | 673 | &dest->addr.nameseq, |
26896904 AS |
674 | m->msg_iov, |
675 | total_len); | |
c4307285 YH |
676 | } |
677 | if (likely(res != -ELINKCONG)) { | |
a016892c | 678 | if (needs_conn && (res >= 0)) |
0c3141e9 | 679 | sock->state = SS_CONNECTING; |
0c3141e9 | 680 | break; |
c4307285 | 681 | } |
3f40504f YX |
682 | res = tipc_wait_for_sndmsg(sock, &timeo); |
683 | if (res) | |
0c3141e9 | 684 | break; |
c4307285 | 685 | } while (1); |
0c3141e9 AS |
686 | |
687 | exit: | |
688 | if (iocb) | |
689 | release_sock(sk); | |
690 | return res; | |
b97bf3fd PL |
691 | } |
692 | ||
391a6dd1 YX |
693 | static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p) |
694 | { | |
695 | struct sock *sk = sock->sk; | |
696 | struct tipc_port *tport = tipc_sk_port(sk); | |
697 | DEFINE_WAIT(wait); | |
698 | int done; | |
699 | ||
700 | do { | |
701 | int err = sock_error(sk); | |
702 | if (err) | |
703 | return err; | |
704 | if (sock->state == SS_DISCONNECTING) | |
705 | return -EPIPE; | |
706 | else if (sock->state != SS_CONNECTED) | |
707 | return -ENOTCONN; | |
708 | if (!*timeo_p) | |
709 | return -EAGAIN; | |
710 | if (signal_pending(current)) | |
711 | return sock_intr_errno(*timeo_p); | |
712 | ||
713 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
714 | done = sk_wait_event(sk, timeo_p, | |
715 | (!tport->congested || !tport->connected)); | |
716 | finish_wait(sk_sleep(sk), &wait); | |
717 | } while (!done); | |
718 | return 0; | |
719 | } | |
720 | ||
c4307285 | 721 | /** |
b97bf3fd | 722 | * send_packet - send a connection-oriented message |
0c3141e9 | 723 | * @iocb: if NULL, indicates that socket lock is already held |
b97bf3fd PL |
724 | * @sock: socket structure |
725 | * @m: message to send | |
e9024f0f | 726 | * @total_len: length of message |
c4307285 | 727 | * |
b97bf3fd | 728 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 729 | * |
b97bf3fd PL |
730 | * Returns the number of bytes sent on success, or errno otherwise |
731 | */ | |
b97bf3fd PL |
732 | static int send_packet(struct kiocb *iocb, struct socket *sock, |
733 | struct msghdr *m, size_t total_len) | |
734 | { | |
0c3141e9 AS |
735 | struct sock *sk = sock->sk; |
736 | struct tipc_port *tport = tipc_sk_port(sk); | |
342dfc30 | 737 | DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name); |
391a6dd1 YX |
738 | int res = -EINVAL; |
739 | long timeo; | |
b97bf3fd PL |
740 | |
741 | /* Handle implied connection establishment */ | |
b97bf3fd PL |
742 | if (unlikely(dest)) |
743 | return send_msg(iocb, sock, m, total_len); | |
744 | ||
97f8b87e | 745 | if (total_len > TIPC_MAX_USER_MSG_SIZE) |
c29c3f70 AS |
746 | return -EMSGSIZE; |
747 | ||
0c3141e9 AS |
748 | if (iocb) |
749 | lock_sock(sk); | |
b97bf3fd | 750 | |
391a6dd1 YX |
751 | if (unlikely(sock->state != SS_CONNECTED)) { |
752 | if (sock->state == SS_DISCONNECTING) | |
753 | res = -EPIPE; | |
754 | else | |
755 | res = -ENOTCONN; | |
756 | goto exit; | |
757 | } | |
1d835874 | 758 | |
391a6dd1 | 759 | timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT); |
c4307285 | 760 | do { |
9446b87a | 761 | res = tipc_send(tport->ref, m->msg_iov, total_len); |
a016892c | 762 | if (likely(res != -ELINKCONG)) |
0c3141e9 | 763 | break; |
391a6dd1 YX |
764 | res = tipc_wait_for_sndpkt(sock, &timeo); |
765 | if (res) | |
0c3141e9 | 766 | break; |
c4307285 | 767 | } while (1); |
391a6dd1 | 768 | exit: |
0c3141e9 AS |
769 | if (iocb) |
770 | release_sock(sk); | |
771 | return res; | |
b97bf3fd PL |
772 | } |
773 | ||
c4307285 | 774 | /** |
b97bf3fd PL |
775 | * send_stream - send stream-oriented data |
776 | * @iocb: (unused) | |
777 | * @sock: socket structure | |
778 | * @m: data to send | |
779 | * @total_len: total length of data to be sent | |
c4307285 | 780 | * |
b97bf3fd | 781 | * Used for SOCK_STREAM data. |
c4307285 YH |
782 | * |
783 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 784 | * or errno if no data sent |
b97bf3fd | 785 | */ |
b97bf3fd PL |
786 | static int send_stream(struct kiocb *iocb, struct socket *sock, |
787 | struct msghdr *m, size_t total_len) | |
788 | { | |
0c3141e9 AS |
789 | struct sock *sk = sock->sk; |
790 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
791 | struct msghdr my_msg; |
792 | struct iovec my_iov; | |
793 | struct iovec *curr_iov; | |
794 | int curr_iovlen; | |
795 | char __user *curr_start; | |
05646c91 | 796 | u32 hdr_size; |
b97bf3fd PL |
797 | int curr_left; |
798 | int bytes_to_send; | |
1303e8f1 | 799 | int bytes_sent; |
b97bf3fd | 800 | int res; |
c4307285 | 801 | |
0c3141e9 AS |
802 | lock_sock(sk); |
803 | ||
05646c91 | 804 | /* Handle special cases where there is no connection */ |
c4307285 | 805 | if (unlikely(sock->state != SS_CONNECTED)) { |
3b8401fe | 806 | if (sock->state == SS_UNCONNECTED) |
0c3141e9 | 807 | res = send_packet(NULL, sock, m, total_len); |
b0555976 | 808 | else |
809 | res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN; | |
3b8401fe | 810 | goto exit; |
c4307285 | 811 | } |
b97bf3fd | 812 | |
0c3141e9 AS |
813 | if (unlikely(m->msg_name)) { |
814 | res = -EISCONN; | |
815 | goto exit; | |
816 | } | |
eb5959c2 | 817 | |
97f8b87e | 818 | if (total_len > (unsigned int)INT_MAX) { |
c29c3f70 AS |
819 | res = -EMSGSIZE; |
820 | goto exit; | |
821 | } | |
822 | ||
c4307285 | 823 | /* |
b97bf3fd PL |
824 | * Send each iovec entry using one or more messages |
825 | * | |
c4307285 | 826 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
827 | * (i.e. one large iovec entry), but could be improved to pass sets |
828 | * of small iovec entries into send_packet(). | |
829 | */ | |
1303e8f1 AS |
830 | curr_iov = m->msg_iov; |
831 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
832 | my_msg.msg_iov = &my_iov; |
833 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
834 | my_msg.msg_flags = m->msg_flags; |
835 | my_msg.msg_name = NULL; | |
1303e8f1 | 836 | bytes_sent = 0; |
b97bf3fd | 837 | |
05646c91 AS |
838 | hdr_size = msg_hdr_sz(&tport->phdr); |
839 | ||
b97bf3fd PL |
840 | while (curr_iovlen--) { |
841 | curr_start = curr_iov->iov_base; | |
842 | curr_left = curr_iov->iov_len; | |
843 | ||
844 | while (curr_left) { | |
05646c91 AS |
845 | bytes_to_send = tport->max_pkt - hdr_size; |
846 | if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE) | |
847 | bytes_to_send = TIPC_MAX_USER_MSG_SIZE; | |
848 | if (curr_left < bytes_to_send) | |
849 | bytes_to_send = curr_left; | |
b97bf3fd PL |
850 | my_iov.iov_base = curr_start; |
851 | my_iov.iov_len = bytes_to_send; | |
26896904 | 852 | res = send_packet(NULL, sock, &my_msg, bytes_to_send); |
2db9983a | 853 | if (res < 0) { |
0c3141e9 | 854 | if (bytes_sent) |
05646c91 | 855 | res = bytes_sent; |
0c3141e9 | 856 | goto exit; |
1303e8f1 | 857 | } |
b97bf3fd PL |
858 | curr_left -= bytes_to_send; |
859 | curr_start += bytes_to_send; | |
1303e8f1 | 860 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
861 | } |
862 | ||
863 | curr_iov++; | |
864 | } | |
0c3141e9 AS |
865 | res = bytes_sent; |
866 | exit: | |
867 | release_sock(sk); | |
868 | return res; | |
b97bf3fd PL |
869 | } |
870 | ||
871 | /** | |
872 | * auto_connect - complete connection setup to a remote port | |
873 | * @sock: socket structure | |
b97bf3fd | 874 | * @msg: peer's response message |
c4307285 | 875 | * |
b97bf3fd PL |
876 | * Returns 0 on success, errno otherwise |
877 | */ | |
0c3141e9 | 878 | static int auto_connect(struct socket *sock, struct tipc_msg *msg) |
b97bf3fd | 879 | { |
2da59918 | 880 | struct tipc_sock *tsock = tipc_sk(sock->sk); |
584d24b3 | 881 | struct tipc_port *p_ptr; |
b97bf3fd | 882 | |
2da59918 AS |
883 | tsock->peer_name.ref = msg_origport(msg); |
884 | tsock->peer_name.node = msg_orignode(msg); | |
584d24b3 YX |
885 | p_ptr = tipc_port_deref(tsock->p->ref); |
886 | if (!p_ptr) | |
887 | return -EINVAL; | |
888 | ||
889 | __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name); | |
890 | ||
891 | if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE) | |
892 | return -EINVAL; | |
893 | msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg)); | |
b97bf3fd PL |
894 | sock->state = SS_CONNECTED; |
895 | return 0; | |
896 | } | |
897 | ||
898 | /** | |
899 | * set_orig_addr - capture sender's address for received message | |
900 | * @m: descriptor for message info | |
901 | * @msg: received message header | |
c4307285 | 902 | * |
b97bf3fd PL |
903 | * Note: Address is not captured if not requested by receiver. |
904 | */ | |
05790c64 | 905 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 906 | { |
342dfc30 | 907 | DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name); |
b97bf3fd | 908 | |
c4307285 | 909 | if (addr) { |
b97bf3fd PL |
910 | addr->family = AF_TIPC; |
911 | addr->addrtype = TIPC_ADDR_ID; | |
60085c3d | 912 | memset(&addr->addr, 0, sizeof(addr->addr)); |
b97bf3fd PL |
913 | addr->addr.id.ref = msg_origport(msg); |
914 | addr->addr.id.node = msg_orignode(msg); | |
0e65967e AS |
915 | addr->addr.name.domain = 0; /* could leave uninitialized */ |
916 | addr->scope = 0; /* could leave uninitialized */ | |
b97bf3fd PL |
917 | m->msg_namelen = sizeof(struct sockaddr_tipc); |
918 | } | |
919 | } | |
920 | ||
921 | /** | |
c4307285 | 922 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
923 | * @m: descriptor for message info |
924 | * @msg: received message header | |
925 | * @tport: TIPC port associated with message | |
c4307285 | 926 | * |
b97bf3fd | 927 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 928 | * |
b97bf3fd PL |
929 | * Returns 0 if successful, otherwise errno |
930 | */ | |
05790c64 | 931 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
ae8509c4 | 932 | struct tipc_port *tport) |
b97bf3fd PL |
933 | { |
934 | u32 anc_data[3]; | |
935 | u32 err; | |
936 | u32 dest_type; | |
3546c750 | 937 | int has_name; |
b97bf3fd PL |
938 | int res; |
939 | ||
940 | if (likely(m->msg_controllen == 0)) | |
941 | return 0; | |
942 | ||
943 | /* Optionally capture errored message object(s) */ | |
b97bf3fd PL |
944 | err = msg ? msg_errcode(msg) : 0; |
945 | if (unlikely(err)) { | |
946 | anc_data[0] = err; | |
947 | anc_data[1] = msg_data_sz(msg); | |
2db9983a AS |
948 | res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data); |
949 | if (res) | |
b97bf3fd | 950 | return res; |
2db9983a AS |
951 | if (anc_data[1]) { |
952 | res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], | |
953 | msg_data(msg)); | |
954 | if (res) | |
955 | return res; | |
956 | } | |
b97bf3fd PL |
957 | } |
958 | ||
959 | /* Optionally capture message destination object */ | |
b97bf3fd PL |
960 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; |
961 | switch (dest_type) { | |
962 | case TIPC_NAMED_MSG: | |
3546c750 | 963 | has_name = 1; |
b97bf3fd PL |
964 | anc_data[0] = msg_nametype(msg); |
965 | anc_data[1] = msg_namelower(msg); | |
966 | anc_data[2] = msg_namelower(msg); | |
967 | break; | |
968 | case TIPC_MCAST_MSG: | |
3546c750 | 969 | has_name = 1; |
b97bf3fd PL |
970 | anc_data[0] = msg_nametype(msg); |
971 | anc_data[1] = msg_namelower(msg); | |
972 | anc_data[2] = msg_nameupper(msg); | |
973 | break; | |
974 | case TIPC_CONN_MSG: | |
3546c750 | 975 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
976 | anc_data[0] = tport->conn_type; |
977 | anc_data[1] = tport->conn_instance; | |
978 | anc_data[2] = tport->conn_instance; | |
979 | break; | |
980 | default: | |
3546c750 | 981 | has_name = 0; |
b97bf3fd | 982 | } |
2db9983a AS |
983 | if (has_name) { |
984 | res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data); | |
985 | if (res) | |
986 | return res; | |
987 | } | |
b97bf3fd PL |
988 | |
989 | return 0; | |
990 | } | |
991 | ||
9bbb4ecc YX |
992 | static int tipc_wait_for_rcvmsg(struct socket *sock, long timeo) |
993 | { | |
994 | struct sock *sk = sock->sk; | |
995 | DEFINE_WAIT(wait); | |
996 | int err; | |
997 | ||
998 | for (;;) { | |
999 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
fe8e4649 | 1000 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
9bbb4ecc YX |
1001 | if (sock->state == SS_DISCONNECTING) { |
1002 | err = -ENOTCONN; | |
1003 | break; | |
1004 | } | |
1005 | release_sock(sk); | |
1006 | timeo = schedule_timeout(timeo); | |
1007 | lock_sock(sk); | |
1008 | } | |
1009 | err = 0; | |
1010 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1011 | break; | |
1012 | err = sock_intr_errno(timeo); | |
1013 | if (signal_pending(current)) | |
1014 | break; | |
1015 | err = -EAGAIN; | |
1016 | if (!timeo) | |
1017 | break; | |
1018 | } | |
1019 | finish_wait(sk_sleep(sk), &wait); | |
1020 | return err; | |
1021 | } | |
1022 | ||
c4307285 | 1023 | /** |
b97bf3fd PL |
1024 | * recv_msg - receive packet-oriented message |
1025 | * @iocb: (unused) | |
1026 | * @m: descriptor for message info | |
1027 | * @buf_len: total size of user buffer area | |
1028 | * @flags: receive flags | |
c4307285 | 1029 | * |
b97bf3fd PL |
1030 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
1031 | * If the complete message doesn't fit in user area, truncate it. | |
1032 | * | |
1033 | * Returns size of returned message data, errno otherwise | |
1034 | */ | |
b97bf3fd PL |
1035 | static int recv_msg(struct kiocb *iocb, struct socket *sock, |
1036 | struct msghdr *m, size_t buf_len, int flags) | |
1037 | { | |
0c3141e9 AS |
1038 | struct sock *sk = sock->sk; |
1039 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1040 | struct sk_buff *buf; |
1041 | struct tipc_msg *msg; | |
9bbb4ecc | 1042 | long timeo; |
b97bf3fd PL |
1043 | unsigned int sz; |
1044 | u32 err; | |
1045 | int res; | |
1046 | ||
0c3141e9 | 1047 | /* Catch invalid receive requests */ |
b97bf3fd PL |
1048 | if (unlikely(!buf_len)) |
1049 | return -EINVAL; | |
1050 | ||
0c3141e9 | 1051 | lock_sock(sk); |
b97bf3fd | 1052 | |
0c3141e9 AS |
1053 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
1054 | res = -ENOTCONN; | |
b97bf3fd PL |
1055 | goto exit; |
1056 | } | |
1057 | ||
9bbb4ecc | 1058 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
0c3141e9 | 1059 | restart: |
b97bf3fd | 1060 | |
0c3141e9 | 1061 | /* Look for a message in receive queue; wait if necessary */ |
9bbb4ecc YX |
1062 | res = tipc_wait_for_rcvmsg(sock, timeo); |
1063 | if (res) | |
1064 | goto exit; | |
b97bf3fd | 1065 | |
0c3141e9 | 1066 | /* Look at first message in receive queue */ |
0c3141e9 | 1067 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1068 | msg = buf_msg(buf); |
1069 | sz = msg_data_sz(msg); | |
1070 | err = msg_errcode(msg); | |
1071 | ||
b97bf3fd | 1072 | /* Discard an empty non-errored message & try again */ |
b97bf3fd | 1073 | if ((!sz) && (!err)) { |
0c3141e9 | 1074 | advance_rx_queue(sk); |
b97bf3fd PL |
1075 | goto restart; |
1076 | } | |
1077 | ||
1078 | /* Capture sender's address (optional) */ | |
b97bf3fd PL |
1079 | set_orig_addr(m, msg); |
1080 | ||
1081 | /* Capture ancillary data (optional) */ | |
0c3141e9 AS |
1082 | res = anc_data_recv(m, msg, tport); |
1083 | if (res) | |
b97bf3fd PL |
1084 | goto exit; |
1085 | ||
1086 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd PL |
1087 | if (!err) { |
1088 | if (unlikely(buf_len < sz)) { | |
1089 | sz = buf_len; | |
1090 | m->msg_flags |= MSG_TRUNC; | |
1091 | } | |
0232fd0a AS |
1092 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg), |
1093 | m->msg_iov, sz); | |
1094 | if (res) | |
b97bf3fd | 1095 | goto exit; |
b97bf3fd PL |
1096 | res = sz; |
1097 | } else { | |
1098 | if ((sock->state == SS_READY) || | |
1099 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
1100 | res = 0; | |
1101 | else | |
1102 | res = -ECONNRESET; | |
1103 | } | |
1104 | ||
1105 | /* Consume received message (optional) */ | |
b97bf3fd | 1106 | if (likely(!(flags & MSG_PEEK))) { |
99009806 | 1107 | if ((sock->state != SS_READY) && |
0c3141e9 AS |
1108 | (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1109 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1110 | advance_rx_queue(sk); | |
c4307285 | 1111 | } |
b97bf3fd | 1112 | exit: |
0c3141e9 | 1113 | release_sock(sk); |
b97bf3fd PL |
1114 | return res; |
1115 | } | |
1116 | ||
c4307285 | 1117 | /** |
b97bf3fd PL |
1118 | * recv_stream - receive stream-oriented data |
1119 | * @iocb: (unused) | |
1120 | * @m: descriptor for message info | |
1121 | * @buf_len: total size of user buffer area | |
1122 | * @flags: receive flags | |
c4307285 YH |
1123 | * |
1124 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
1125 | * will optionally wait for more; never truncates data. |
1126 | * | |
1127 | * Returns size of returned message data, errno otherwise | |
1128 | */ | |
b97bf3fd PL |
1129 | static int recv_stream(struct kiocb *iocb, struct socket *sock, |
1130 | struct msghdr *m, size_t buf_len, int flags) | |
1131 | { | |
0c3141e9 AS |
1132 | struct sock *sk = sock->sk; |
1133 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1134 | struct sk_buff *buf; |
1135 | struct tipc_msg *msg; | |
9bbb4ecc | 1136 | long timeo; |
b97bf3fd | 1137 | unsigned int sz; |
3720d40b | 1138 | int sz_to_copy, target, needed; |
b97bf3fd | 1139 | int sz_copied = 0; |
b97bf3fd | 1140 | u32 err; |
0c3141e9 | 1141 | int res = 0; |
b97bf3fd | 1142 | |
0c3141e9 | 1143 | /* Catch invalid receive attempts */ |
b97bf3fd PL |
1144 | if (unlikely(!buf_len)) |
1145 | return -EINVAL; | |
1146 | ||
0c3141e9 | 1147 | lock_sock(sk); |
b97bf3fd | 1148 | |
9bbb4ecc | 1149 | if (unlikely(sock->state == SS_UNCONNECTED)) { |
0c3141e9 | 1150 | res = -ENOTCONN; |
b97bf3fd PL |
1151 | goto exit; |
1152 | } | |
1153 | ||
3720d40b | 1154 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len); |
9bbb4ecc | 1155 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
b97bf3fd | 1156 | |
617d3c7a | 1157 | restart: |
0c3141e9 | 1158 | /* Look for a message in receive queue; wait if necessary */ |
9bbb4ecc YX |
1159 | res = tipc_wait_for_rcvmsg(sock, timeo); |
1160 | if (res) | |
1161 | goto exit; | |
b97bf3fd | 1162 | |
0c3141e9 | 1163 | /* Look at first message in receive queue */ |
0c3141e9 | 1164 | buf = skb_peek(&sk->sk_receive_queue); |
b97bf3fd PL |
1165 | msg = buf_msg(buf); |
1166 | sz = msg_data_sz(msg); | |
1167 | err = msg_errcode(msg); | |
1168 | ||
1169 | /* Discard an empty non-errored message & try again */ | |
b97bf3fd | 1170 | if ((!sz) && (!err)) { |
0c3141e9 | 1171 | advance_rx_queue(sk); |
b97bf3fd PL |
1172 | goto restart; |
1173 | } | |
1174 | ||
1175 | /* Optionally capture sender's address & ancillary data of first msg */ | |
b97bf3fd PL |
1176 | if (sz_copied == 0) { |
1177 | set_orig_addr(m, msg); | |
0c3141e9 AS |
1178 | res = anc_data_recv(m, msg, tport); |
1179 | if (res) | |
b97bf3fd PL |
1180 | goto exit; |
1181 | } | |
1182 | ||
1183 | /* Capture message data (if valid) & compute return value (always) */ | |
b97bf3fd | 1184 | if (!err) { |
0232fd0a | 1185 | u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle); |
b97bf3fd | 1186 | |
0232fd0a | 1187 | sz -= offset; |
b97bf3fd PL |
1188 | needed = (buf_len - sz_copied); |
1189 | sz_to_copy = (sz <= needed) ? sz : needed; | |
0232fd0a AS |
1190 | |
1191 | res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset, | |
1192 | m->msg_iov, sz_to_copy); | |
1193 | if (res) | |
b97bf3fd | 1194 | goto exit; |
0232fd0a | 1195 | |
b97bf3fd PL |
1196 | sz_copied += sz_to_copy; |
1197 | ||
1198 | if (sz_to_copy < sz) { | |
1199 | if (!(flags & MSG_PEEK)) | |
0232fd0a AS |
1200 | TIPC_SKB_CB(buf)->handle = |
1201 | (void *)(unsigned long)(offset + sz_to_copy); | |
b97bf3fd PL |
1202 | goto exit; |
1203 | } | |
b97bf3fd PL |
1204 | } else { |
1205 | if (sz_copied != 0) | |
1206 | goto exit; /* can't add error msg to valid data */ | |
1207 | ||
1208 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1209 | res = 0; | |
1210 | else | |
1211 | res = -ECONNRESET; | |
1212 | } | |
1213 | ||
1214 | /* Consume received message (optional) */ | |
b97bf3fd | 1215 | if (likely(!(flags & MSG_PEEK))) { |
0c3141e9 AS |
1216 | if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1217 | tipc_acknowledge(tport->ref, tport->conn_unacked); | |
1218 | advance_rx_queue(sk); | |
c4307285 | 1219 | } |
b97bf3fd PL |
1220 | |
1221 | /* Loop around if more data is required */ | |
f64f9e71 JP |
1222 | if ((sz_copied < buf_len) && /* didn't get all requested data */ |
1223 | (!skb_queue_empty(&sk->sk_receive_queue) || | |
3720d40b | 1224 | (sz_copied < target)) && /* and more is ready or required */ |
f64f9e71 JP |
1225 | (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */ |
1226 | (!err)) /* and haven't reached a FIN */ | |
b97bf3fd PL |
1227 | goto restart; |
1228 | ||
1229 | exit: | |
0c3141e9 | 1230 | release_sock(sk); |
a3b0a5a9 | 1231 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1232 | } |
1233 | ||
f288bef4 YX |
1234 | /** |
1235 | * tipc_write_space - wake up thread if port congestion is released | |
1236 | * @sk: socket | |
1237 | */ | |
1238 | static void tipc_write_space(struct sock *sk) | |
1239 | { | |
1240 | struct socket_wq *wq; | |
1241 | ||
1242 | rcu_read_lock(); | |
1243 | wq = rcu_dereference(sk->sk_wq); | |
1244 | if (wq_has_sleeper(wq)) | |
1245 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
1246 | POLLWRNORM | POLLWRBAND); | |
1247 | rcu_read_unlock(); | |
1248 | } | |
1249 | ||
1250 | /** | |
1251 | * tipc_data_ready - wake up threads to indicate messages have been received | |
1252 | * @sk: socket | |
1253 | * @len: the length of messages | |
1254 | */ | |
1255 | static void tipc_data_ready(struct sock *sk, int len) | |
1256 | { | |
1257 | struct socket_wq *wq; | |
1258 | ||
1259 | rcu_read_lock(); | |
1260 | wq = rcu_dereference(sk->sk_wq); | |
1261 | if (wq_has_sleeper(wq)) | |
1262 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | | |
1263 | POLLRDNORM | POLLRDBAND); | |
1264 | rcu_read_unlock(); | |
1265 | } | |
1266 | ||
7e6c131e YX |
1267 | /** |
1268 | * filter_connect - Handle all incoming messages for a connection-based socket | |
1269 | * @tsock: TIPC socket | |
1270 | * @msg: message | |
1271 | * | |
1272 | * Returns TIPC error status code and socket error status code | |
1273 | * once it encounters some errors | |
1274 | */ | |
1275 | static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf) | |
1276 | { | |
1277 | struct socket *sock = tsock->sk.sk_socket; | |
1278 | struct tipc_msg *msg = buf_msg(*buf); | |
584d24b3 | 1279 | struct sock *sk = &tsock->sk; |
7e6c131e | 1280 | u32 retval = TIPC_ERR_NO_PORT; |
584d24b3 | 1281 | int res; |
7e6c131e YX |
1282 | |
1283 | if (msg_mcast(msg)) | |
1284 | return retval; | |
1285 | ||
1286 | switch ((int)sock->state) { | |
1287 | case SS_CONNECTED: | |
1288 | /* Accept only connection-based messages sent by peer */ | |
1289 | if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) { | |
1290 | if (unlikely(msg_errcode(msg))) { | |
1291 | sock->state = SS_DISCONNECTING; | |
1292 | __tipc_disconnect(tsock->p); | |
1293 | } | |
1294 | retval = TIPC_OK; | |
1295 | } | |
1296 | break; | |
1297 | case SS_CONNECTING: | |
1298 | /* Accept only ACK or NACK message */ | |
584d24b3 YX |
1299 | if (unlikely(msg_errcode(msg))) { |
1300 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1301 | sk->sk_err = ECONNREFUSED; |
584d24b3 YX |
1302 | retval = TIPC_OK; |
1303 | break; | |
1304 | } | |
1305 | ||
1306 | if (unlikely(!msg_connected(msg))) | |
1307 | break; | |
1308 | ||
1309 | res = auto_connect(sock, msg); | |
1310 | if (res) { | |
1311 | sock->state = SS_DISCONNECTING; | |
2c8d8518 | 1312 | sk->sk_err = -res; |
7e6c131e | 1313 | retval = TIPC_OK; |
584d24b3 YX |
1314 | break; |
1315 | } | |
1316 | ||
1317 | /* If an incoming message is an 'ACK-', it should be | |
1318 | * discarded here because it doesn't contain useful | |
1319 | * data. In addition, we should try to wake up | |
1320 | * connect() routine if sleeping. | |
1321 | */ | |
1322 | if (msg_data_sz(msg) == 0) { | |
1323 | kfree_skb(*buf); | |
1324 | *buf = NULL; | |
1325 | if (waitqueue_active(sk_sleep(sk))) | |
1326 | wake_up_interruptible(sk_sleep(sk)); | |
1327 | } | |
1328 | retval = TIPC_OK; | |
7e6c131e YX |
1329 | break; |
1330 | case SS_LISTENING: | |
1331 | case SS_UNCONNECTED: | |
1332 | /* Accept only SYN message */ | |
1333 | if (!msg_connected(msg) && !(msg_errcode(msg))) | |
1334 | retval = TIPC_OK; | |
1335 | break; | |
1336 | case SS_DISCONNECTING: | |
1337 | break; | |
1338 | default: | |
1339 | pr_err("Unknown socket state %u\n", sock->state); | |
1340 | } | |
1341 | return retval; | |
1342 | } | |
1343 | ||
aba79f33 YX |
1344 | /** |
1345 | * rcvbuf_limit - get proper overload limit of socket receive queue | |
1346 | * @sk: socket | |
1347 | * @buf: message | |
1348 | * | |
1349 | * For all connection oriented messages, irrespective of importance, | |
1350 | * the default overload value (i.e. 67MB) is set as limit. | |
1351 | * | |
1352 | * For all connectionless messages, by default new queue limits are | |
1353 | * as belows: | |
1354 | * | |
cc79dd1b YX |
1355 | * TIPC_LOW_IMPORTANCE (4 MB) |
1356 | * TIPC_MEDIUM_IMPORTANCE (8 MB) | |
1357 | * TIPC_HIGH_IMPORTANCE (16 MB) | |
1358 | * TIPC_CRITICAL_IMPORTANCE (32 MB) | |
aba79f33 YX |
1359 | * |
1360 | * Returns overload limit according to corresponding message importance | |
1361 | */ | |
1362 | static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf) | |
1363 | { | |
1364 | struct tipc_msg *msg = buf_msg(buf); | |
aba79f33 YX |
1365 | |
1366 | if (msg_connected(msg)) | |
0cee6bbe | 1367 | return sysctl_tipc_rmem[2]; |
1368 | ||
1369 | return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE << | |
1370 | msg_importance(msg); | |
aba79f33 YX |
1371 | } |
1372 | ||
c4307285 | 1373 | /** |
0c3141e9 AS |
1374 | * filter_rcv - validate incoming message |
1375 | * @sk: socket | |
b97bf3fd | 1376 | * @buf: message |
c4307285 | 1377 | * |
0c3141e9 AS |
1378 | * Enqueues message on receive queue if acceptable; optionally handles |
1379 | * disconnect indication for a connected socket. | |
1380 | * | |
1381 | * Called with socket lock already taken; port lock may also be taken. | |
c4307285 | 1382 | * |
b97bf3fd PL |
1383 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1384 | */ | |
0c3141e9 | 1385 | static u32 filter_rcv(struct sock *sk, struct sk_buff *buf) |
b97bf3fd | 1386 | { |
0c3141e9 | 1387 | struct socket *sock = sk->sk_socket; |
b97bf3fd | 1388 | struct tipc_msg *msg = buf_msg(buf); |
aba79f33 | 1389 | unsigned int limit = rcvbuf_limit(sk, buf); |
7e6c131e | 1390 | u32 res = TIPC_OK; |
b97bf3fd | 1391 | |
b97bf3fd | 1392 | /* Reject message if it is wrong sort of message for socket */ |
aad58547 AS |
1393 | if (msg_type(msg) > TIPC_DIRECT_MSG) |
1394 | return TIPC_ERR_NO_PORT; | |
0c3141e9 | 1395 | |
b97bf3fd | 1396 | if (sock->state == SS_READY) { |
b29f1428 | 1397 | if (msg_connected(msg)) |
b97bf3fd | 1398 | return TIPC_ERR_NO_PORT; |
b97bf3fd | 1399 | } else { |
7e6c131e YX |
1400 | res = filter_connect(tipc_sk(sk), &buf); |
1401 | if (res != TIPC_OK || buf == NULL) | |
1402 | return res; | |
b97bf3fd PL |
1403 | } |
1404 | ||
1405 | /* Reject message if there isn't room to queue it */ | |
aba79f33 YX |
1406 | if (sk_rmem_alloc_get(sk) + buf->truesize >= limit) |
1407 | return TIPC_ERR_OVERLOAD; | |
b97bf3fd | 1408 | |
aba79f33 | 1409 | /* Enqueue message */ |
40682432 | 1410 | TIPC_SKB_CB(buf)->handle = NULL; |
0c3141e9 | 1411 | __skb_queue_tail(&sk->sk_receive_queue, buf); |
aba79f33 | 1412 | skb_set_owner_r(buf, sk); |
0c3141e9 | 1413 | |
f288bef4 | 1414 | sk->sk_data_ready(sk, 0); |
0c3141e9 AS |
1415 | return TIPC_OK; |
1416 | } | |
b97bf3fd | 1417 | |
0c3141e9 AS |
1418 | /** |
1419 | * backlog_rcv - handle incoming message from backlog queue | |
1420 | * @sk: socket | |
1421 | * @buf: message | |
1422 | * | |
1423 | * Caller must hold socket lock, but not port lock. | |
1424 | * | |
1425 | * Returns 0 | |
1426 | */ | |
0c3141e9 AS |
1427 | static int backlog_rcv(struct sock *sk, struct sk_buff *buf) |
1428 | { | |
1429 | u32 res; | |
1430 | ||
1431 | res = filter_rcv(sk, buf); | |
1432 | if (res) | |
1433 | tipc_reject_msg(buf, res); | |
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | /** | |
1438 | * dispatch - handle incoming message | |
1439 | * @tport: TIPC port that received message | |
1440 | * @buf: message | |
1441 | * | |
1442 | * Called with port lock already taken. | |
1443 | * | |
1444 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) | |
1445 | */ | |
0c3141e9 AS |
1446 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) |
1447 | { | |
c0fee8ac | 1448 | struct sock *sk = tport->sk; |
0c3141e9 AS |
1449 | u32 res; |
1450 | ||
1451 | /* | |
1452 | * Process message if socket is unlocked; otherwise add to backlog queue | |
1453 | * | |
1454 | * This code is based on sk_receive_skb(), but must be distinct from it | |
1455 | * since a TIPC-specific filter/reject mechanism is utilized | |
1456 | */ | |
0c3141e9 AS |
1457 | bh_lock_sock(sk); |
1458 | if (!sock_owned_by_user(sk)) { | |
1459 | res = filter_rcv(sk, buf); | |
1460 | } else { | |
aba79f33 | 1461 | if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf))) |
53eecb1b ZY |
1462 | res = TIPC_ERR_OVERLOAD; |
1463 | else | |
1464 | res = TIPC_OK; | |
0c3141e9 AS |
1465 | } |
1466 | bh_unlock_sock(sk); | |
1467 | ||
1468 | return res; | |
b97bf3fd PL |
1469 | } |
1470 | ||
c4307285 | 1471 | /** |
b97bf3fd PL |
1472 | * wakeupdispatch - wake up port after congestion |
1473 | * @tport: port to wakeup | |
c4307285 | 1474 | * |
0c3141e9 | 1475 | * Called with port lock already taken. |
b97bf3fd | 1476 | */ |
b97bf3fd PL |
1477 | static void wakeupdispatch(struct tipc_port *tport) |
1478 | { | |
c0fee8ac | 1479 | struct sock *sk = tport->sk; |
b97bf3fd | 1480 | |
f288bef4 | 1481 | sk->sk_write_space(sk); |
b97bf3fd PL |
1482 | } |
1483 | ||
78eb3a53 YX |
1484 | static int tipc_wait_for_connect(struct socket *sock, long *timeo_p) |
1485 | { | |
1486 | struct sock *sk = sock->sk; | |
1487 | DEFINE_WAIT(wait); | |
1488 | int done; | |
1489 | ||
1490 | do { | |
1491 | int err = sock_error(sk); | |
1492 | if (err) | |
1493 | return err; | |
1494 | if (!*timeo_p) | |
1495 | return -ETIMEDOUT; | |
1496 | if (signal_pending(current)) | |
1497 | return sock_intr_errno(*timeo_p); | |
1498 | ||
1499 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); | |
1500 | done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING); | |
1501 | finish_wait(sk_sleep(sk), &wait); | |
1502 | } while (!done); | |
1503 | return 0; | |
1504 | } | |
1505 | ||
b97bf3fd PL |
1506 | /** |
1507 | * connect - establish a connection to another TIPC port | |
1508 | * @sock: socket structure | |
1509 | * @dest: socket address for destination port | |
1510 | * @destlen: size of socket address data structure | |
0c3141e9 | 1511 | * @flags: file-related flags associated with socket |
b97bf3fd PL |
1512 | * |
1513 | * Returns 0 on success, errno otherwise | |
1514 | */ | |
c4307285 | 1515 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1516 | int flags) |
1517 | { | |
0c3141e9 | 1518 | struct sock *sk = sock->sk; |
b89741a0 AS |
1519 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; |
1520 | struct msghdr m = {NULL,}; | |
78eb3a53 YX |
1521 | long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout; |
1522 | socket_state previous; | |
b89741a0 AS |
1523 | int res; |
1524 | ||
0c3141e9 AS |
1525 | lock_sock(sk); |
1526 | ||
b89741a0 | 1527 | /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */ |
0c3141e9 AS |
1528 | if (sock->state == SS_READY) { |
1529 | res = -EOPNOTSUPP; | |
1530 | goto exit; | |
1531 | } | |
b89741a0 | 1532 | |
b89741a0 AS |
1533 | /* |
1534 | * Reject connection attempt using multicast address | |
1535 | * | |
1536 | * Note: send_msg() validates the rest of the address fields, | |
1537 | * so there's no need to do it here | |
1538 | */ | |
0c3141e9 AS |
1539 | if (dst->addrtype == TIPC_ADDR_MCAST) { |
1540 | res = -EINVAL; | |
1541 | goto exit; | |
1542 | } | |
1543 | ||
78eb3a53 | 1544 | previous = sock->state; |
584d24b3 YX |
1545 | switch (sock->state) { |
1546 | case SS_UNCONNECTED: | |
1547 | /* Send a 'SYN-' to destination */ | |
1548 | m.msg_name = dest; | |
1549 | m.msg_namelen = destlen; | |
1550 | ||
1551 | /* If connect is in non-blocking case, set MSG_DONTWAIT to | |
1552 | * indicate send_msg() is never blocked. | |
1553 | */ | |
1554 | if (!timeout) | |
1555 | m.msg_flags = MSG_DONTWAIT; | |
1556 | ||
1557 | res = send_msg(NULL, sock, &m, 0); | |
1558 | if ((res < 0) && (res != -EWOULDBLOCK)) | |
1559 | goto exit; | |
1560 | ||
1561 | /* Just entered SS_CONNECTING state; the only | |
1562 | * difference is that return value in non-blocking | |
1563 | * case is EINPROGRESS, rather than EALREADY. | |
1564 | */ | |
1565 | res = -EINPROGRESS; | |
584d24b3 | 1566 | case SS_CONNECTING: |
78eb3a53 YX |
1567 | if (previous == SS_CONNECTING) |
1568 | res = -EALREADY; | |
1569 | if (!timeout) | |
1570 | goto exit; | |
1571 | timeout = msecs_to_jiffies(timeout); | |
1572 | /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */ | |
1573 | res = tipc_wait_for_connect(sock, &timeout); | |
584d24b3 YX |
1574 | break; |
1575 | case SS_CONNECTED: | |
1576 | res = -EISCONN; | |
1577 | break; | |
1578 | default: | |
1579 | res = -EINVAL; | |
78eb3a53 | 1580 | break; |
b89741a0 | 1581 | } |
0c3141e9 AS |
1582 | exit: |
1583 | release_sock(sk); | |
b89741a0 | 1584 | return res; |
b97bf3fd PL |
1585 | } |
1586 | ||
c4307285 | 1587 | /** |
b97bf3fd PL |
1588 | * listen - allow socket to listen for incoming connections |
1589 | * @sock: socket structure | |
1590 | * @len: (unused) | |
c4307285 | 1591 | * |
b97bf3fd PL |
1592 | * Returns 0 on success, errno otherwise |
1593 | */ | |
b97bf3fd PL |
1594 | static int listen(struct socket *sock, int len) |
1595 | { | |
0c3141e9 AS |
1596 | struct sock *sk = sock->sk; |
1597 | int res; | |
1598 | ||
1599 | lock_sock(sk); | |
b97bf3fd | 1600 | |
245f3d34 | 1601 | if (sock->state != SS_UNCONNECTED) |
0c3141e9 AS |
1602 | res = -EINVAL; |
1603 | else { | |
1604 | sock->state = SS_LISTENING; | |
1605 | res = 0; | |
1606 | } | |
1607 | ||
1608 | release_sock(sk); | |
1609 | return res; | |
b97bf3fd PL |
1610 | } |
1611 | ||
6398e23c YX |
1612 | static int tipc_wait_for_accept(struct socket *sock, long timeo) |
1613 | { | |
1614 | struct sock *sk = sock->sk; | |
1615 | DEFINE_WAIT(wait); | |
1616 | int err; | |
1617 | ||
1618 | /* True wake-one mechanism for incoming connections: only | |
1619 | * one process gets woken up, not the 'whole herd'. | |
1620 | * Since we do not 'race & poll' for established sockets | |
1621 | * anymore, the common case will execute the loop only once. | |
1622 | */ | |
1623 | for (;;) { | |
1624 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, | |
1625 | TASK_INTERRUPTIBLE); | |
fe8e4649 | 1626 | if (timeo && skb_queue_empty(&sk->sk_receive_queue)) { |
6398e23c YX |
1627 | release_sock(sk); |
1628 | timeo = schedule_timeout(timeo); | |
1629 | lock_sock(sk); | |
1630 | } | |
1631 | err = 0; | |
1632 | if (!skb_queue_empty(&sk->sk_receive_queue)) | |
1633 | break; | |
1634 | err = -EINVAL; | |
1635 | if (sock->state != SS_LISTENING) | |
1636 | break; | |
1637 | err = sock_intr_errno(timeo); | |
1638 | if (signal_pending(current)) | |
1639 | break; | |
1640 | err = -EAGAIN; | |
1641 | if (!timeo) | |
1642 | break; | |
1643 | } | |
1644 | finish_wait(sk_sleep(sk), &wait); | |
1645 | return err; | |
1646 | } | |
1647 | ||
c4307285 | 1648 | /** |
b97bf3fd PL |
1649 | * accept - wait for connection request |
1650 | * @sock: listening socket | |
1651 | * @newsock: new socket that is to be connected | |
1652 | * @flags: file-related flags associated with socket | |
c4307285 | 1653 | * |
b97bf3fd PL |
1654 | * Returns 0 on success, errno otherwise |
1655 | */ | |
0c3141e9 | 1656 | static int accept(struct socket *sock, struct socket *new_sock, int flags) |
b97bf3fd | 1657 | { |
0fef8f20 | 1658 | struct sock *new_sk, *sk = sock->sk; |
b97bf3fd | 1659 | struct sk_buff *buf; |
0fef8f20 PG |
1660 | struct tipc_sock *new_tsock; |
1661 | struct tipc_port *new_tport; | |
1662 | struct tipc_msg *msg; | |
1663 | u32 new_ref; | |
6398e23c | 1664 | long timeo; |
0c3141e9 | 1665 | int res; |
b97bf3fd | 1666 | |
0c3141e9 | 1667 | lock_sock(sk); |
b97bf3fd | 1668 | |
0c3141e9 AS |
1669 | if (sock->state != SS_LISTENING) { |
1670 | res = -EINVAL; | |
b97bf3fd PL |
1671 | goto exit; |
1672 | } | |
b97bf3fd | 1673 | |
6398e23c YX |
1674 | timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
1675 | res = tipc_wait_for_accept(sock, timeo); | |
1676 | if (res) | |
1677 | goto exit; | |
0c3141e9 AS |
1678 | |
1679 | buf = skb_peek(&sk->sk_receive_queue); | |
1680 | ||
c5fa7b3c | 1681 | res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1); |
0fef8f20 PG |
1682 | if (res) |
1683 | goto exit; | |
b97bf3fd | 1684 | |
0fef8f20 PG |
1685 | new_sk = new_sock->sk; |
1686 | new_tsock = tipc_sk(new_sk); | |
1687 | new_tport = new_tsock->p; | |
1688 | new_ref = new_tport->ref; | |
1689 | msg = buf_msg(buf); | |
b97bf3fd | 1690 | |
0fef8f20 PG |
1691 | /* we lock on new_sk; but lockdep sees the lock on sk */ |
1692 | lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING); | |
1693 | ||
1694 | /* | |
1695 | * Reject any stray messages received by new socket | |
1696 | * before the socket lock was taken (very, very unlikely) | |
1697 | */ | |
1698 | reject_rx_queue(new_sk); | |
1699 | ||
1700 | /* Connect new socket to it's peer */ | |
1701 | new_tsock->peer_name.ref = msg_origport(msg); | |
1702 | new_tsock->peer_name.node = msg_orignode(msg); | |
1703 | tipc_connect(new_ref, &new_tsock->peer_name); | |
1704 | new_sock->state = SS_CONNECTED; | |
1705 | ||
1706 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1707 | if (msg_named(msg)) { | |
1708 | new_tport->conn_type = msg_nametype(msg); | |
1709 | new_tport->conn_instance = msg_nameinst(msg); | |
b97bf3fd | 1710 | } |
0fef8f20 PG |
1711 | |
1712 | /* | |
1713 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. | |
1714 | * Respond to 'SYN+' by queuing it on new socket. | |
1715 | */ | |
1716 | if (!msg_data_sz(msg)) { | |
1717 | struct msghdr m = {NULL,}; | |
1718 | ||
1719 | advance_rx_queue(sk); | |
1720 | send_packet(NULL, new_sock, &m, 0); | |
1721 | } else { | |
1722 | __skb_dequeue(&sk->sk_receive_queue); | |
1723 | __skb_queue_head(&new_sk->sk_receive_queue, buf); | |
aba79f33 | 1724 | skb_set_owner_r(buf, new_sk); |
0fef8f20 PG |
1725 | } |
1726 | release_sock(new_sk); | |
1727 | ||
b97bf3fd | 1728 | exit: |
0c3141e9 | 1729 | release_sock(sk); |
b97bf3fd PL |
1730 | return res; |
1731 | } | |
1732 | ||
1733 | /** | |
1734 | * shutdown - shutdown socket connection | |
1735 | * @sock: socket structure | |
e247a8f5 | 1736 | * @how: direction to close (must be SHUT_RDWR) |
b97bf3fd PL |
1737 | * |
1738 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1739 | * |
b97bf3fd PL |
1740 | * Returns 0 on success, errno otherwise |
1741 | */ | |
b97bf3fd PL |
1742 | static int shutdown(struct socket *sock, int how) |
1743 | { | |
0c3141e9 AS |
1744 | struct sock *sk = sock->sk; |
1745 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1746 | struct sk_buff *buf; |
1747 | int res; | |
1748 | ||
e247a8f5 AS |
1749 | if (how != SHUT_RDWR) |
1750 | return -EINVAL; | |
b97bf3fd | 1751 | |
0c3141e9 | 1752 | lock_sock(sk); |
b97bf3fd PL |
1753 | |
1754 | switch (sock->state) { | |
0c3141e9 | 1755 | case SS_CONNECTING: |
b97bf3fd PL |
1756 | case SS_CONNECTED: |
1757 | ||
b97bf3fd | 1758 | restart: |
617d3c7a | 1759 | /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */ |
0c3141e9 AS |
1760 | buf = __skb_dequeue(&sk->sk_receive_queue); |
1761 | if (buf) { | |
40682432 | 1762 | if (TIPC_SKB_CB(buf)->handle != NULL) { |
5f6d9123 | 1763 | kfree_skb(buf); |
b97bf3fd PL |
1764 | goto restart; |
1765 | } | |
0c3141e9 | 1766 | tipc_disconnect(tport->ref); |
b97bf3fd | 1767 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); |
0c3141e9 AS |
1768 | } else { |
1769 | tipc_shutdown(tport->ref); | |
b97bf3fd | 1770 | } |
0c3141e9 AS |
1771 | |
1772 | sock->state = SS_DISCONNECTING; | |
b97bf3fd PL |
1773 | |
1774 | /* fall through */ | |
1775 | ||
1776 | case SS_DISCONNECTING: | |
1777 | ||
75031151 | 1778 | /* Discard any unreceived messages */ |
57467e56 | 1779 | __skb_queue_purge(&sk->sk_receive_queue); |
75031151 YX |
1780 | |
1781 | /* Wake up anyone sleeping in poll */ | |
1782 | sk->sk_state_change(sk); | |
b97bf3fd PL |
1783 | res = 0; |
1784 | break; | |
1785 | ||
1786 | default: | |
1787 | res = -ENOTCONN; | |
1788 | } | |
1789 | ||
0c3141e9 | 1790 | release_sock(sk); |
b97bf3fd PL |
1791 | return res; |
1792 | } | |
1793 | ||
1794 | /** | |
1795 | * setsockopt - set socket option | |
1796 | * @sock: socket structure | |
1797 | * @lvl: option level | |
1798 | * @opt: option identifier | |
1799 | * @ov: pointer to new option value | |
1800 | * @ol: length of option value | |
c4307285 YH |
1801 | * |
1802 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1803 | * (to ease compatibility). |
c4307285 | 1804 | * |
b97bf3fd PL |
1805 | * Returns 0 on success, errno otherwise |
1806 | */ | |
ae8509c4 PG |
1807 | static int setsockopt(struct socket *sock, int lvl, int opt, char __user *ov, |
1808 | unsigned int ol) | |
b97bf3fd | 1809 | { |
0c3141e9 AS |
1810 | struct sock *sk = sock->sk; |
1811 | struct tipc_port *tport = tipc_sk_port(sk); | |
b97bf3fd PL |
1812 | u32 value; |
1813 | int res; | |
1814 | ||
c4307285 YH |
1815 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1816 | return 0; | |
b97bf3fd PL |
1817 | if (lvl != SOL_TIPC) |
1818 | return -ENOPROTOOPT; | |
1819 | if (ol < sizeof(value)) | |
1820 | return -EINVAL; | |
2db9983a AS |
1821 | res = get_user(value, (u32 __user *)ov); |
1822 | if (res) | |
b97bf3fd PL |
1823 | return res; |
1824 | ||
0c3141e9 | 1825 | lock_sock(sk); |
c4307285 | 1826 | |
b97bf3fd PL |
1827 | switch (opt) { |
1828 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1829 | res = tipc_set_portimportance(tport->ref, value); |
b97bf3fd PL |
1830 | break; |
1831 | case TIPC_SRC_DROPPABLE: | |
1832 | if (sock->type != SOCK_STREAM) | |
0c3141e9 | 1833 | res = tipc_set_portunreliable(tport->ref, value); |
c4307285 | 1834 | else |
b97bf3fd PL |
1835 | res = -ENOPROTOOPT; |
1836 | break; | |
1837 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1838 | res = tipc_set_portunreturnable(tport->ref, value); |
b97bf3fd PL |
1839 | break; |
1840 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1841 | tipc_sk(sk)->conn_timeout = value; |
0c3141e9 | 1842 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd PL |
1843 | break; |
1844 | default: | |
1845 | res = -EINVAL; | |
1846 | } | |
1847 | ||
0c3141e9 AS |
1848 | release_sock(sk); |
1849 | ||
b97bf3fd PL |
1850 | return res; |
1851 | } | |
1852 | ||
1853 | /** | |
1854 | * getsockopt - get socket option | |
1855 | * @sock: socket structure | |
1856 | * @lvl: option level | |
1857 | * @opt: option identifier | |
1858 | * @ov: receptacle for option value | |
1859 | * @ol: receptacle for length of option value | |
c4307285 YH |
1860 | * |
1861 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1862 | * (to ease compatibility). |
c4307285 | 1863 | * |
b97bf3fd PL |
1864 | * Returns 0 on success, errno otherwise |
1865 | */ | |
ae8509c4 PG |
1866 | static int getsockopt(struct socket *sock, int lvl, int opt, char __user *ov, |
1867 | int __user *ol) | |
b97bf3fd | 1868 | { |
0c3141e9 AS |
1869 | struct sock *sk = sock->sk; |
1870 | struct tipc_port *tport = tipc_sk_port(sk); | |
c4307285 | 1871 | int len; |
b97bf3fd | 1872 | u32 value; |
c4307285 | 1873 | int res; |
b97bf3fd | 1874 | |
c4307285 YH |
1875 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1876 | return put_user(0, ol); | |
b97bf3fd PL |
1877 | if (lvl != SOL_TIPC) |
1878 | return -ENOPROTOOPT; | |
2db9983a AS |
1879 | res = get_user(len, ol); |
1880 | if (res) | |
c4307285 | 1881 | return res; |
b97bf3fd | 1882 | |
0c3141e9 | 1883 | lock_sock(sk); |
b97bf3fd PL |
1884 | |
1885 | switch (opt) { | |
1886 | case TIPC_IMPORTANCE: | |
0c3141e9 | 1887 | res = tipc_portimportance(tport->ref, &value); |
b97bf3fd PL |
1888 | break; |
1889 | case TIPC_SRC_DROPPABLE: | |
0c3141e9 | 1890 | res = tipc_portunreliable(tport->ref, &value); |
b97bf3fd PL |
1891 | break; |
1892 | case TIPC_DEST_DROPPABLE: | |
0c3141e9 | 1893 | res = tipc_portunreturnable(tport->ref, &value); |
b97bf3fd PL |
1894 | break; |
1895 | case TIPC_CONN_TIMEOUT: | |
a0f40f02 | 1896 | value = tipc_sk(sk)->conn_timeout; |
0c3141e9 | 1897 | /* no need to set "res", since already 0 at this point */ |
b97bf3fd | 1898 | break; |
0e65967e | 1899 | case TIPC_NODE_RECVQ_DEPTH: |
9da3d475 | 1900 | value = 0; /* was tipc_queue_size, now obsolete */ |
6650613d | 1901 | break; |
0e65967e | 1902 | case TIPC_SOCK_RECVQ_DEPTH: |
6650613d | 1903 | value = skb_queue_len(&sk->sk_receive_queue); |
1904 | break; | |
b97bf3fd PL |
1905 | default: |
1906 | res = -EINVAL; | |
1907 | } | |
1908 | ||
0c3141e9 AS |
1909 | release_sock(sk); |
1910 | ||
25860c3b PG |
1911 | if (res) |
1912 | return res; /* "get" failed */ | |
b97bf3fd | 1913 | |
25860c3b PG |
1914 | if (len < sizeof(value)) |
1915 | return -EINVAL; | |
1916 | ||
1917 | if (copy_to_user(ov, &value, sizeof(value))) | |
1918 | return -EFAULT; | |
1919 | ||
1920 | return put_user(sizeof(value), ol); | |
b97bf3fd PL |
1921 | } |
1922 | ||
ae86b9e3 BH |
1923 | /* Protocol switches for the various types of TIPC sockets */ |
1924 | ||
bca65eae | 1925 | static const struct proto_ops msg_ops = { |
0e65967e | 1926 | .owner = THIS_MODULE, |
b97bf3fd PL |
1927 | .family = AF_TIPC, |
1928 | .release = release, | |
1929 | .bind = bind, | |
1930 | .connect = connect, | |
5eee6a6d | 1931 | .socketpair = sock_no_socketpair, |
245f3d34 | 1932 | .accept = sock_no_accept, |
b97bf3fd PL |
1933 | .getname = get_name, |
1934 | .poll = poll, | |
5eee6a6d | 1935 | .ioctl = sock_no_ioctl, |
245f3d34 | 1936 | .listen = sock_no_listen, |
b97bf3fd PL |
1937 | .shutdown = shutdown, |
1938 | .setsockopt = setsockopt, | |
1939 | .getsockopt = getsockopt, | |
1940 | .sendmsg = send_msg, | |
1941 | .recvmsg = recv_msg, | |
8238745a YH |
1942 | .mmap = sock_no_mmap, |
1943 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1944 | }; |
1945 | ||
bca65eae | 1946 | static const struct proto_ops packet_ops = { |
0e65967e | 1947 | .owner = THIS_MODULE, |
b97bf3fd PL |
1948 | .family = AF_TIPC, |
1949 | .release = release, | |
1950 | .bind = bind, | |
1951 | .connect = connect, | |
5eee6a6d | 1952 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1953 | .accept = accept, |
1954 | .getname = get_name, | |
1955 | .poll = poll, | |
5eee6a6d | 1956 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1957 | .listen = listen, |
1958 | .shutdown = shutdown, | |
1959 | .setsockopt = setsockopt, | |
1960 | .getsockopt = getsockopt, | |
1961 | .sendmsg = send_packet, | |
1962 | .recvmsg = recv_msg, | |
8238745a YH |
1963 | .mmap = sock_no_mmap, |
1964 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1965 | }; |
1966 | ||
bca65eae | 1967 | static const struct proto_ops stream_ops = { |
0e65967e | 1968 | .owner = THIS_MODULE, |
b97bf3fd PL |
1969 | .family = AF_TIPC, |
1970 | .release = release, | |
1971 | .bind = bind, | |
1972 | .connect = connect, | |
5eee6a6d | 1973 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1974 | .accept = accept, |
1975 | .getname = get_name, | |
1976 | .poll = poll, | |
5eee6a6d | 1977 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1978 | .listen = listen, |
1979 | .shutdown = shutdown, | |
1980 | .setsockopt = setsockopt, | |
1981 | .getsockopt = getsockopt, | |
1982 | .sendmsg = send_stream, | |
1983 | .recvmsg = recv_stream, | |
8238745a YH |
1984 | .mmap = sock_no_mmap, |
1985 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1986 | }; |
1987 | ||
bca65eae | 1988 | static const struct net_proto_family tipc_family_ops = { |
0e65967e | 1989 | .owner = THIS_MODULE, |
b97bf3fd | 1990 | .family = AF_TIPC, |
c5fa7b3c | 1991 | .create = tipc_sk_create |
b97bf3fd PL |
1992 | }; |
1993 | ||
1994 | static struct proto tipc_proto = { | |
1995 | .name = "TIPC", | |
1996 | .owner = THIS_MODULE, | |
cc79dd1b YX |
1997 | .obj_size = sizeof(struct tipc_sock), |
1998 | .sysctl_rmem = sysctl_tipc_rmem | |
b97bf3fd PL |
1999 | }; |
2000 | ||
c5fa7b3c YX |
2001 | static struct proto tipc_proto_kern = { |
2002 | .name = "TIPC", | |
2003 | .obj_size = sizeof(struct tipc_sock), | |
2004 | .sysctl_rmem = sysctl_tipc_rmem | |
2005 | }; | |
2006 | ||
b97bf3fd | 2007 | /** |
4323add6 | 2008 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 2009 | * |
b97bf3fd PL |
2010 | * Returns 0 on success, errno otherwise |
2011 | */ | |
4323add6 | 2012 | int tipc_socket_init(void) |
b97bf3fd PL |
2013 | { |
2014 | int res; | |
2015 | ||
c4307285 | 2016 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 2017 | if (res) { |
2cf8aa19 | 2018 | pr_err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
2019 | goto out; |
2020 | } | |
2021 | ||
2022 | res = sock_register(&tipc_family_ops); | |
2023 | if (res) { | |
2cf8aa19 | 2024 | pr_err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
2025 | proto_unregister(&tipc_proto); |
2026 | goto out; | |
2027 | } | |
b97bf3fd PL |
2028 | out: |
2029 | return res; | |
2030 | } | |
2031 | ||
2032 | /** | |
4323add6 | 2033 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 2034 | */ |
4323add6 | 2035 | void tipc_socket_stop(void) |
b97bf3fd | 2036 | { |
b97bf3fd PL |
2037 | sock_unregister(tipc_family_ops.family); |
2038 | proto_unregister(&tipc_proto); | |
2039 | } |