blob: e36b4b5a5222320644fd1d7fe35c06bfe982e7f0 [file] [log] [blame]
Per Lidenb97bf3f2006-01-02 19:04:38 +01001/*
2 * net/tipc/socket.c: TIPC socket API
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09003 *
Allan Stephens5eee6a62007-06-10 17:24:55 -07004 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2004-2007, Wind River Systems
Per Lidenb97bf3f2006-01-02 19:04:38 +01006 * All rights reserved.
7 *
Per Liden9ea1fd32006-01-11 13:30:43 +01008 * Redistribution and use in source and binary forms, with or without
Per Lidenb97bf3f2006-01-02 19:04:38 +01009 * modification, are permitted provided that the following conditions are met:
10 *
Per Liden9ea1fd32006-01-11 13:30:43 +010011 * 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.
Per Lidenb97bf3f2006-01-02 19:04:38 +010019 *
Per Liden9ea1fd32006-01-11 13:30:43 +010020 * 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
Per Lidenb97bf3f2006-01-02 19:04:38 +010034 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <linux/module.h>
38#include <linux/types.h>
39#include <linux/net.h>
40#include <linux/socket.h>
41#include <linux/errno.h>
42#include <linux/mm.h>
43#include <linux/slab.h>
44#include <linux/poll.h>
Per Lidenb97bf3f2006-01-02 19:04:38 +010045#include <linux/fcntl.h>
Per Lidenb97bf3f2006-01-02 19:04:38 +010046#include <asm/semaphore.h>
47#include <asm/string.h>
48#include <asm/atomic.h>
49#include <net/sock.h>
50
51#include <linux/tipc.h>
Per Lidenea714cc2006-01-11 12:28:47 +010052#include <linux/tipc_config.h>
Per Lidenb97bf3f2006-01-02 19:04:38 +010053#include <net/tipc/tipc_msg.h>
54#include <net/tipc/tipc_port.h>
55
56#include "core.h"
57
58#define SS_LISTENING -1 /* socket is listening */
59#define SS_READY -2 /* socket is connectionless */
60
61#define OVERLOAD_LIMIT_BASE 5000
62
63struct tipc_sock {
64 struct sock sk;
65 struct tipc_port *p;
66 struct semaphore sem;
67};
68
69#define tipc_sk(sk) ((struct tipc_sock*)sk)
70
71static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
72static void wakeupdispatch(struct tipc_port *tport);
73
74static struct proto_ops packet_ops;
75static struct proto_ops stream_ops;
76static struct proto_ops msg_ops;
77
78static struct proto tipc_proto;
79
80static int sockets_enabled = 0;
81
82static atomic_t tipc_queue_size = ATOMIC_INIT(0);
83
84
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090085/*
86 * sock_lock(): Lock a port/socket pair. lock_sock() can
87 * not be used here, since the same lock must protect ports
Per Lidenb97bf3f2006-01-02 19:04:38 +010088 * with non-socket interfaces.
89 * See net.c for description of locking policy.
90 */
Sam Ravnborg05790c62006-03-20 22:37:04 -080091static void sock_lock(struct tipc_sock* tsock)
Per Lidenb97bf3f2006-01-02 19:04:38 +010092{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090093 spin_lock_bh(tsock->p->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +010094}
95
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +090096/*
Per Lidenb97bf3f2006-01-02 19:04:38 +010097 * sock_unlock(): Unlock a port/socket pair
98 */
Sam Ravnborg05790c62006-03-20 22:37:04 -080099static void sock_unlock(struct tipc_sock* tsock)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100100{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900101 spin_unlock_bh(tsock->p->lock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100102}
103
104/**
105 * pollmask - determine the current set of poll() events for a socket
106 * @sock: socket structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900107 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100108 * TIPC sets the returned events as follows:
109 * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty
110 * or if a connection-oriented socket is does not have an active connection
111 * (i.e. a read operation will not block).
112 * b) POLLOUT is set except when a socket's connection has been terminated
113 * (i.e. a write operation will not block).
114 * c) POLLHUP is set when a socket's connection has been terminated.
115 *
116 * IMPORTANT: The fact that a read or write operation will not block does NOT
117 * imply that the operation will succeed!
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900118 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100119 * Returns pollmask value
120 */
121
Sam Ravnborg05790c62006-03-20 22:37:04 -0800122static u32 pollmask(struct socket *sock)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100123{
124 u32 mask;
125
126 if ((skb_queue_len(&sock->sk->sk_receive_queue) != 0) ||
127 (sock->state == SS_UNCONNECTED) ||
128 (sock->state == SS_DISCONNECTING))
129 mask = (POLLRDNORM | POLLIN);
130 else
131 mask = 0;
132
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900133 if (sock->state == SS_DISCONNECTING)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100134 mask |= POLLHUP;
135 else
136 mask |= POLLOUT;
137
138 return mask;
139}
140
141
142/**
143 * advance_queue - discard first buffer in queue
144 * @tsock: TIPC socket
145 */
146
Sam Ravnborg05790c62006-03-20 22:37:04 -0800147static void advance_queue(struct tipc_sock *tsock)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100148{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900149 sock_lock(tsock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100150 buf_discard(skb_dequeue(&tsock->sk.sk_receive_queue));
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900151 sock_unlock(tsock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100152 atomic_dec(&tipc_queue_size);
153}
154
155/**
156 * tipc_create - create a TIPC socket
157 * @sock: pre-allocated socket structure
158 * @protocol: protocol indicator (must be 0)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900159 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100160 * This routine creates and attaches a 'struct sock' to the 'struct socket',
161 * then create and attaches a TIPC port to the 'struct sock' part.
162 *
163 * Returns 0 on success, errno otherwise
164 */
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700165static int tipc_create(struct net *net, struct socket *sock, int protocol)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100166{
167 struct tipc_sock *tsock;
168 struct tipc_port *port;
169 struct sock *sk;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900170 u32 ref;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100171
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700172 if (net != &init_net)
173 return -EAFNOSUPPORT;
174
Per Lidenb97bf3f2006-01-02 19:04:38 +0100175 if (unlikely(protocol != 0))
176 return -EPROTONOSUPPORT;
177
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800178 ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100179 if (unlikely(!ref))
180 return -ENOMEM;
181
182 sock->state = SS_UNCONNECTED;
183
184 switch (sock->type) {
185 case SOCK_STREAM:
186 sock->ops = &stream_ops;
187 break;
188 case SOCK_SEQPACKET:
189 sock->ops = &packet_ops;
190 break;
191 case SOCK_DGRAM:
192 tipc_set_portunreliable(ref, 1);
193 /* fall through */
194 case SOCK_RDM:
195 tipc_set_portunreturnable(ref, 1);
196 sock->ops = &msg_ops;
197 sock->state = SS_READY;
198 break;
Allan Stephens49978652006-06-25 23:47:18 -0700199 default:
200 tipc_deleteport(ref);
201 return -EPROTOTYPE;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100202 }
203
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -0700204 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100205 if (!sk) {
206 tipc_deleteport(ref);
207 return -ENOMEM;
208 }
209
210 sock_init_data(sock, sk);
211 init_waitqueue_head(sk->sk_sleep);
212 sk->sk_rcvtimeo = 8 * HZ; /* default connect timeout = 8s */
213
214 tsock = tipc_sk(sk);
215 port = tipc_get_port(ref);
216
217 tsock->p = port;
218 port->usr_handle = tsock;
219
220 init_MUTEX(&tsock->sem);
221
222 dbg("sock_create: %x\n",tsock);
223
224 atomic_inc(&tipc_user_count);
225
226 return 0;
227}
228
229/**
230 * release - destroy a TIPC socket
231 * @sock: socket to destroy
232 *
233 * This routine cleans up any messages that are still queued on the socket.
234 * For DGRAM and RDM socket types, all queued messages are rejected.
235 * For SEQPACKET and STREAM socket types, the first message is rejected
236 * and any others are discarded. (If the first message on a STREAM socket
237 * is partially-read, it is discarded and the next one is rejected instead.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900238 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100239 * NOTE: Rejected messages are not necessarily returned to the sender! They
240 * are returned or discarded according to the "destination droppable" setting
241 * specified for the message by the sender.
242 *
243 * Returns 0 on success, errno otherwise
244 */
245
246static int release(struct socket *sock)
247{
248 struct tipc_sock *tsock = tipc_sk(sock->sk);
249 struct sock *sk = sock->sk;
250 int res = TIPC_OK;
251 struct sk_buff *buf;
252
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900253 dbg("sock_delete: %x\n",tsock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100254 if (!tsock)
255 return 0;
256 down_interruptible(&tsock->sem);
257 if (!sock->sk) {
258 up(&tsock->sem);
259 return 0;
260 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900261
Per Lidenb97bf3f2006-01-02 19:04:38 +0100262 /* Reject unreceived messages, unless no longer connected */
263
264 while (sock->state != SS_DISCONNECTING) {
265 sock_lock(tsock);
266 buf = skb_dequeue(&sk->sk_receive_queue);
267 if (!buf)
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800268 tsock->p->usr_handle = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100269 sock_unlock(tsock);
270 if (!buf)
271 break;
272 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf)))
273 buf_discard(buf);
274 else
275 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
276 atomic_dec(&tipc_queue_size);
277 }
278
279 /* Delete TIPC port */
280
281 res = tipc_deleteport(tsock->p->ref);
282 sock->sk = NULL;
283
284 /* Discard any remaining messages */
285
286 while ((buf = skb_dequeue(&sk->sk_receive_queue))) {
287 buf_discard(buf);
288 atomic_dec(&tipc_queue_size);
289 }
290
291 up(&tsock->sem);
292
293 sock_put(sk);
294
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900295 atomic_dec(&tipc_user_count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100296 return res;
297}
298
299/**
300 * bind - associate or disassocate TIPC name(s) with a socket
301 * @sock: socket structure
302 * @uaddr: socket address describing name(s) and desired operation
303 * @uaddr_len: size of socket address data structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900304 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100305 * Name and name sequence binding is indicated using a positive scope value;
306 * a negative scope value unbinds the specified name. Specifying no name
307 * (i.e. a socket address length of 0) unbinds all names from the socket.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900308 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100309 * Returns 0 on success, errno otherwise
310 */
311
312static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
313{
314 struct tipc_sock *tsock = tipc_sk(sock->sk);
315 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
316 int res;
317
318 if (down_interruptible(&tsock->sem))
319 return -ERESTARTSYS;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900320
Per Lidenb97bf3f2006-01-02 19:04:38 +0100321 if (unlikely(!uaddr_len)) {
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800322 res = tipc_withdraw(tsock->p->ref, 0, NULL);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100323 goto exit;
324 }
325
326 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
327 res = -EINVAL;
328 goto exit;
329 }
330
331 if (addr->family != AF_TIPC) {
332 res = -EAFNOSUPPORT;
333 goto exit;
334 }
335 if (addr->addrtype == TIPC_ADDR_NAME)
336 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
337 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
338 res = -EAFNOSUPPORT;
339 goto exit;
340 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900341
342 if (addr->scope > 0)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100343 res = tipc_publish(tsock->p->ref, addr->scope,
344 &addr->addr.nameseq);
345 else
346 res = tipc_withdraw(tsock->p->ref, -addr->scope,
347 &addr->addr.nameseq);
348exit:
349 up(&tsock->sem);
350 return res;
351}
352
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900353/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100354 * get_name - get port ID of socket or peer socket
355 * @sock: socket structure
356 * @uaddr: area for returned socket address
357 * @uaddr_len: area for returned length of socket address
358 * @peer: 0 to obtain socket name, 1 to obtain peer socket name
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900359 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100360 * Returns 0 on success, errno otherwise
361 */
362
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900363static int get_name(struct socket *sock, struct sockaddr *uaddr,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100364 int *uaddr_len, int peer)
365{
366 struct tipc_sock *tsock = tipc_sk(sock->sk);
367 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
368 u32 res;
369
370 if (down_interruptible(&tsock->sem))
371 return -ERESTARTSYS;
372
373 *uaddr_len = sizeof(*addr);
374 addr->addrtype = TIPC_ADDR_ID;
375 addr->family = AF_TIPC;
376 addr->scope = 0;
377 if (peer)
378 res = tipc_peer(tsock->p->ref, &addr->addr.id);
379 else
380 res = tipc_ownidentity(tsock->p->ref, &addr->addr.id);
381 addr->addr.name.domain = 0;
382
383 up(&tsock->sem);
384 return res;
385}
386
387/**
388 * poll - read and possibly block on pollmask
389 * @file: file structure associated with the socket
390 * @sock: socket for which to calculate the poll bits
391 * @wait: ???
392 *
393 * Returns the pollmask
394 */
395
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900396static unsigned int poll(struct file *file, struct socket *sock,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100397 poll_table *wait)
398{
399 poll_wait(file, sock->sk->sk_sleep, wait);
400 /* NEED LOCK HERE? */
401 return pollmask(sock);
402}
403
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900404/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100405 * dest_name_check - verify user is permitted to send to specified port name
406 * @dest: destination address
407 * @m: descriptor for message to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900408 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100409 * Prevents restricted configuration commands from being issued by
410 * unauthorized users.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900411 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100412 * Returns 0 if permission is granted, otherwise errno
413 */
414
Sam Ravnborg05790c62006-03-20 22:37:04 -0800415static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100416{
417 struct tipc_cfg_msg_hdr hdr;
418
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900419 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
420 return 0;
421 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
422 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100423
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900424 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
425 return -EACCES;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100426
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900427 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100428 return -EFAULT;
Allan Stephens70cb2342006-06-25 23:41:47 -0700429 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100430 return -EACCES;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900431
Per Lidenb97bf3f2006-01-02 19:04:38 +0100432 return 0;
433}
434
435/**
436 * send_msg - send message in connectionless manner
437 * @iocb: (unused)
438 * @sock: socket structure
439 * @m: message to send
Allan Stephense9024f02006-06-25 23:43:57 -0700440 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900441 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100442 * Message must have an destination specified explicitly.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900443 * Used for SOCK_RDM and SOCK_DGRAM messages,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100444 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
445 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900446 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100447 * Returns the number of bytes sent on success, or errno otherwise
448 */
449
450static int send_msg(struct kiocb *iocb, struct socket *sock,
451 struct msghdr *m, size_t total_len)
452{
453 struct tipc_sock *tsock = tipc_sk(sock->sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900454 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100455 struct sk_buff *buf;
456 int needs_conn;
457 int res = -EINVAL;
458
459 if (unlikely(!dest))
460 return -EDESTADDRREQ;
Allan Stephens51f9cc12006-06-25 23:49:06 -0700461 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
462 (dest->family != AF_TIPC)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100463 return -EINVAL;
464
465 needs_conn = (sock->state != SS_READY);
466 if (unlikely(needs_conn)) {
467 if (sock->state == SS_LISTENING)
468 return -EPIPE;
469 if (sock->state != SS_UNCONNECTED)
470 return -EISCONN;
471 if ((tsock->p->published) ||
472 ((sock->type == SOCK_STREAM) && (total_len != 0)))
473 return -EOPNOTSUPP;
Allan Stephens33880072006-06-25 23:44:57 -0700474 if (dest->addrtype == TIPC_ADDR_NAME) {
475 tsock->p->conn_type = dest->addr.name.name.type;
476 tsock->p->conn_instance = dest->addr.name.name.instance;
477 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100478 }
479
480 if (down_interruptible(&tsock->sem))
481 return -ERESTARTSYS;
482
483 if (needs_conn) {
484
485 /* Abort any pending connection attempts (very unlikely) */
486
487 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
488 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
489 atomic_dec(&tipc_queue_size);
490 }
491
492 sock->state = SS_CONNECTING;
493 }
494
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900495 do {
496 if (dest->addrtype == TIPC_ADDR_NAME) {
497 if ((res = dest_name_check(dest, m)))
498 goto exit;
499 res = tipc_send2name(tsock->p->ref,
500 &dest->addr.name.name,
501 dest->addr.name.domain,
502 m->msg_iovlen,
503 m->msg_iov);
504 }
505 else if (dest->addrtype == TIPC_ADDR_ID) {
506 res = tipc_send2port(tsock->p->ref,
507 &dest->addr.id,
508 m->msg_iovlen,
509 m->msg_iov);
510 }
511 else if (dest->addrtype == TIPC_ADDR_MCAST) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100512 if (needs_conn) {
513 res = -EOPNOTSUPP;
514 goto exit;
515 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900516 if ((res = dest_name_check(dest, m)))
517 goto exit;
518 res = tipc_multicast(tsock->p->ref,
519 &dest->addr.nameseq,
520 0,
521 m->msg_iovlen,
522 m->msg_iov);
523 }
524 if (likely(res != -ELINKCONG)) {
525exit:
526 up(&tsock->sem);
527 return res;
528 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100529 if (m->msg_flags & MSG_DONTWAIT) {
530 res = -EWOULDBLOCK;
531 goto exit;
532 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900533 if (wait_event_interruptible(*sock->sk->sk_sleep,
534 !tsock->p->congested)) {
535 res = -ERESTARTSYS;
536 goto exit;
537 }
538 } while (1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100539}
540
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900541/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100542 * send_packet - send a connection-oriented message
543 * @iocb: (unused)
544 * @sock: socket structure
545 * @m: message to send
Allan Stephense9024f02006-06-25 23:43:57 -0700546 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900547 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100548 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900549 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100550 * Returns the number of bytes sent on success, or errno otherwise
551 */
552
553static int send_packet(struct kiocb *iocb, struct socket *sock,
554 struct msghdr *m, size_t total_len)
555{
556 struct tipc_sock *tsock = tipc_sk(sock->sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900557 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100558 int res;
559
560 /* Handle implied connection establishment */
561
562 if (unlikely(dest))
563 return send_msg(iocb, sock, m, total_len);
564
565 if (down_interruptible(&tsock->sem)) {
566 return -ERESTARTSYS;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900567 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100568
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900569 do {
Allan Stephensbdd94782006-06-25 23:45:53 -0700570 if (unlikely(sock->state != SS_CONNECTED)) {
571 if (sock->state == SS_DISCONNECTING)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900572 res = -EPIPE;
Allan Stephensbdd94782006-06-25 23:45:53 -0700573 else
574 res = -ENOTCONN;
575 goto exit;
576 }
577
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900578 res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov);
579 if (likely(res != -ELINKCONG)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100580exit:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900581 up(&tsock->sem);
582 return res;
583 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100584 if (m->msg_flags & MSG_DONTWAIT) {
585 res = -EWOULDBLOCK;
586 goto exit;
587 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900588 if (wait_event_interruptible(*sock->sk->sk_sleep,
589 !tsock->p->congested)) {
590 res = -ERESTARTSYS;
591 goto exit;
592 }
593 } while (1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100594}
595
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900596/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100597 * send_stream - send stream-oriented data
598 * @iocb: (unused)
599 * @sock: socket structure
600 * @m: data to send
601 * @total_len: total length of data to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900602 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100603 * Used for SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900604 *
605 * Returns the number of bytes sent on success (or partial success),
Allan Stephens1303e8f2006-06-25 23:46:50 -0700606 * or errno if no data sent
Per Lidenb97bf3f2006-01-02 19:04:38 +0100607 */
608
609
610static int send_stream(struct kiocb *iocb, struct socket *sock,
611 struct msghdr *m, size_t total_len)
612{
Allan Stephens05646c92007-06-10 17:25:24 -0700613 struct tipc_port *tport;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100614 struct msghdr my_msg;
615 struct iovec my_iov;
616 struct iovec *curr_iov;
617 int curr_iovlen;
618 char __user *curr_start;
Allan Stephens05646c92007-06-10 17:25:24 -0700619 u32 hdr_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100620 int curr_left;
621 int bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700622 int bytes_sent;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100623 int res;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900624
Allan Stephens05646c92007-06-10 17:25:24 -0700625 /* Handle special cases where there is no connection */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100626
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900627 if (unlikely(sock->state != SS_CONNECTED)) {
Allan Stephens05646c92007-06-10 17:25:24 -0700628 if (sock->state == SS_UNCONNECTED)
629 return send_packet(iocb, sock, m, total_len);
630 else if (sock->state == SS_DISCONNECTING)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900631 return -EPIPE;
632 else
633 return -ENOTCONN;
634 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100635
Allan Stephenseb5959c2006-10-16 21:43:54 -0700636 if (unlikely(m->msg_name))
637 return -EISCONN;
638
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900639 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +0100640 * Send each iovec entry using one or more messages
641 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900642 * Note: This algorithm is good for the most likely case
Per Lidenb97bf3f2006-01-02 19:04:38 +0100643 * (i.e. one large iovec entry), but could be improved to pass sets
644 * of small iovec entries into send_packet().
645 */
646
Allan Stephens1303e8f2006-06-25 23:46:50 -0700647 curr_iov = m->msg_iov;
648 curr_iovlen = m->msg_iovlen;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100649 my_msg.msg_iov = &my_iov;
650 my_msg.msg_iovlen = 1;
Allan Stephenseb5959c2006-10-16 21:43:54 -0700651 my_msg.msg_flags = m->msg_flags;
652 my_msg.msg_name = NULL;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700653 bytes_sent = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100654
Allan Stephens05646c92007-06-10 17:25:24 -0700655 tport = tipc_sk(sock->sk)->p;
656 hdr_size = msg_hdr_sz(&tport->phdr);
657
Per Lidenb97bf3f2006-01-02 19:04:38 +0100658 while (curr_iovlen--) {
659 curr_start = curr_iov->iov_base;
660 curr_left = curr_iov->iov_len;
661
662 while (curr_left) {
Allan Stephens05646c92007-06-10 17:25:24 -0700663 bytes_to_send = tport->max_pkt - hdr_size;
664 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
665 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
666 if (curr_left < bytes_to_send)
667 bytes_to_send = curr_left;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100668 my_iov.iov_base = curr_start;
669 my_iov.iov_len = bytes_to_send;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900670 if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0) {
Allan Stephens05646c92007-06-10 17:25:24 -0700671 if (bytes_sent != 0)
672 res = bytes_sent;
673 return res;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700674 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100675 curr_left -= bytes_to_send;
676 curr_start += bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700677 bytes_sent += bytes_to_send;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100678 }
679
680 curr_iov++;
681 }
682
Allan Stephens1303e8f2006-06-25 23:46:50 -0700683 return bytes_sent;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100684}
685
686/**
687 * auto_connect - complete connection setup to a remote port
688 * @sock: socket structure
689 * @tsock: TIPC-specific socket structure
690 * @msg: peer's response message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900691 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100692 * Returns 0 on success, errno otherwise
693 */
694
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900695static int auto_connect(struct socket *sock, struct tipc_sock *tsock,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100696 struct tipc_msg *msg)
697{
698 struct tipc_portid peer;
699
700 if (msg_errcode(msg)) {
701 sock->state = SS_DISCONNECTING;
702 return -ECONNREFUSED;
703 }
704
705 peer.ref = msg_origport(msg);
706 peer.node = msg_orignode(msg);
707 tipc_connect2port(tsock->p->ref, &peer);
708 tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
709 sock->state = SS_CONNECTED;
710 return 0;
711}
712
713/**
714 * set_orig_addr - capture sender's address for received message
715 * @m: descriptor for message info
716 * @msg: received message header
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900717 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100718 * Note: Address is not captured if not requested by receiver.
719 */
720
Sam Ravnborg05790c62006-03-20 22:37:04 -0800721static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100722{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900723 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100724
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900725 if (addr) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100726 addr->family = AF_TIPC;
727 addr->addrtype = TIPC_ADDR_ID;
728 addr->addr.id.ref = msg_origport(msg);
729 addr->addr.id.node = msg_orignode(msg);
730 addr->addr.name.domain = 0; /* could leave uninitialized */
731 addr->scope = 0; /* could leave uninitialized */
732 m->msg_namelen = sizeof(struct sockaddr_tipc);
733 }
734}
735
736/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900737 * anc_data_recv - optionally capture ancillary data for received message
Per Lidenb97bf3f2006-01-02 19:04:38 +0100738 * @m: descriptor for message info
739 * @msg: received message header
740 * @tport: TIPC port associated with message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900741 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100742 * Note: Ancillary data is not captured if not requested by receiver.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900743 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100744 * Returns 0 if successful, otherwise errno
745 */
746
Sam Ravnborg05790c62006-03-20 22:37:04 -0800747static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100748 struct tipc_port *tport)
749{
750 u32 anc_data[3];
751 u32 err;
752 u32 dest_type;
Allan Stephens3546c752006-06-25 23:45:24 -0700753 int has_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100754 int res;
755
756 if (likely(m->msg_controllen == 0))
757 return 0;
758
759 /* Optionally capture errored message object(s) */
760
761 err = msg ? msg_errcode(msg) : 0;
762 if (unlikely(err)) {
763 anc_data[0] = err;
764 anc_data[1] = msg_data_sz(msg);
Allan Stephens4b087b22006-06-25 23:47:44 -0700765 if ((res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100766 return res;
767 if (anc_data[1] &&
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900768 (res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
Per Lidenb97bf3f2006-01-02 19:04:38 +0100769 msg_data(msg))))
770 return res;
771 }
772
773 /* Optionally capture message destination object */
774
775 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
776 switch (dest_type) {
777 case TIPC_NAMED_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700778 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100779 anc_data[0] = msg_nametype(msg);
780 anc_data[1] = msg_namelower(msg);
781 anc_data[2] = msg_namelower(msg);
782 break;
783 case TIPC_MCAST_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700784 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100785 anc_data[0] = msg_nametype(msg);
786 anc_data[1] = msg_namelower(msg);
787 anc_data[2] = msg_nameupper(msg);
788 break;
789 case TIPC_CONN_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700790 has_name = (tport->conn_type != 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100791 anc_data[0] = tport->conn_type;
792 anc_data[1] = tport->conn_instance;
793 anc_data[2] = tport->conn_instance;
794 break;
795 default:
Allan Stephens3546c752006-06-25 23:45:24 -0700796 has_name = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100797 }
Allan Stephens3546c752006-06-25 23:45:24 -0700798 if (has_name &&
Allan Stephens4b087b22006-06-25 23:47:44 -0700799 (res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100800 return res;
801
802 return 0;
803}
804
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900805/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100806 * recv_msg - receive packet-oriented message
807 * @iocb: (unused)
808 * @m: descriptor for message info
809 * @buf_len: total size of user buffer area
810 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900811 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100812 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
813 * If the complete message doesn't fit in user area, truncate it.
814 *
815 * Returns size of returned message data, errno otherwise
816 */
817
818static int recv_msg(struct kiocb *iocb, struct socket *sock,
819 struct msghdr *m, size_t buf_len, int flags)
820{
821 struct tipc_sock *tsock = tipc_sk(sock->sk);
822 struct sk_buff *buf;
823 struct tipc_msg *msg;
824 unsigned int q_len;
825 unsigned int sz;
826 u32 err;
827 int res;
828
829 /* Currently doesn't support receiving into multiple iovec entries */
830
831 if (m->msg_iovlen != 1)
832 return -EOPNOTSUPP;
833
834 /* Catch invalid receive attempts */
835
836 if (unlikely(!buf_len))
837 return -EINVAL;
838
839 if (sock->type == SOCK_SEQPACKET) {
840 if (unlikely(sock->state == SS_UNCONNECTED))
841 return -ENOTCONN;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900842 if (unlikely((sock->state == SS_DISCONNECTING) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100843 (skb_queue_len(&sock->sk->sk_receive_queue) == 0)))
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900844 return -ENOTCONN;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100845 }
846
847 /* Look for a message in receive queue; wait if necessary */
848
849 if (unlikely(down_interruptible(&tsock->sem)))
850 return -ERESTARTSYS;
851
852restart:
853 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
854 (flags & MSG_DONTWAIT))) {
855 res = -EWOULDBLOCK;
856 goto exit;
857 }
858
859 if ((res = wait_event_interruptible(
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900860 *sock->sk->sk_sleep,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100861 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
862 (sock->state == SS_DISCONNECTING))) )) {
863 goto exit;
864 }
865
866 /* Catch attempt to receive on an already terminated connection */
867 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */
868
869 if (!q_len) {
870 res = -ENOTCONN;
871 goto exit;
872 }
873
874 /* Get access to first message in receive queue */
875
876 buf = skb_peek(&sock->sk->sk_receive_queue);
877 msg = buf_msg(buf);
878 sz = msg_data_sz(msg);
879 err = msg_errcode(msg);
880
881 /* Complete connection setup for an implied connect */
882
883 if (unlikely(sock->state == SS_CONNECTING)) {
884 if ((res = auto_connect(sock, tsock, msg)))
885 goto exit;
886 }
887
888 /* Discard an empty non-errored message & try again */
889
890 if ((!sz) && (!err)) {
891 advance_queue(tsock);
892 goto restart;
893 }
894
895 /* Capture sender's address (optional) */
896
897 set_orig_addr(m, msg);
898
899 /* Capture ancillary data (optional) */
900
901 if ((res = anc_data_recv(m, msg, tsock->p)))
902 goto exit;
903
904 /* Capture message data (if valid) & compute return value (always) */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900905
Per Lidenb97bf3f2006-01-02 19:04:38 +0100906 if (!err) {
907 if (unlikely(buf_len < sz)) {
908 sz = buf_len;
909 m->msg_flags |= MSG_TRUNC;
910 }
911 if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg),
912 sz))) {
913 res = -EFAULT;
914 goto exit;
915 }
916 res = sz;
917 } else {
918 if ((sock->state == SS_READY) ||
919 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
920 res = 0;
921 else
922 res = -ECONNRESET;
923 }
924
925 /* Consume received message (optional) */
926
927 if (likely(!(flags & MSG_PEEK))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900928 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
929 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100930 advance_queue(tsock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900931 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100932exit:
933 up(&tsock->sem);
934 return res;
935}
936
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900937/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100938 * recv_stream - receive stream-oriented data
939 * @iocb: (unused)
940 * @m: descriptor for message info
941 * @buf_len: total size of user buffer area
942 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900943 *
944 * Used for SOCK_STREAM messages only. If not enough data is available
Per Lidenb97bf3f2006-01-02 19:04:38 +0100945 * will optionally wait for more; never truncates data.
946 *
947 * Returns size of returned message data, errno otherwise
948 */
949
950static int recv_stream(struct kiocb *iocb, struct socket *sock,
951 struct msghdr *m, size_t buf_len, int flags)
952{
953 struct tipc_sock *tsock = tipc_sk(sock->sk);
954 struct sk_buff *buf;
955 struct tipc_msg *msg;
956 unsigned int q_len;
957 unsigned int sz;
958 int sz_to_copy;
959 int sz_copied = 0;
960 int needed;
Al Viro28c4dad2006-10-10 22:45:57 +0100961 char __user *crs = m->msg_iov->iov_base;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100962 unsigned char *buf_crs;
963 u32 err;
964 int res;
965
966 /* Currently doesn't support receiving into multiple iovec entries */
967
968 if (m->msg_iovlen != 1)
969 return -EOPNOTSUPP;
970
971 /* Catch invalid receive attempts */
972
973 if (unlikely(!buf_len))
974 return -EINVAL;
975
976 if (unlikely(sock->state == SS_DISCONNECTING)) {
977 if (skb_queue_len(&sock->sk->sk_receive_queue) == 0)
978 return -ENOTCONN;
979 } else if (unlikely(sock->state != SS_CONNECTED))
980 return -ENOTCONN;
981
982 /* Look for a message in receive queue; wait if necessary */
983
984 if (unlikely(down_interruptible(&tsock->sem)))
985 return -ERESTARTSYS;
986
987restart:
988 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
989 (flags & MSG_DONTWAIT))) {
Allan Stephensa3b0a5a2006-06-25 23:48:22 -0700990 res = -EWOULDBLOCK;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100991 goto exit;
992 }
993
994 if ((res = wait_event_interruptible(
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900995 *sock->sk->sk_sleep,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100996 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
997 (sock->state == SS_DISCONNECTING))) )) {
998 goto exit;
999 }
1000
1001 /* Catch attempt to receive on an already terminated connection */
1002 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */
1003
1004 if (!q_len) {
1005 res = -ENOTCONN;
1006 goto exit;
1007 }
1008
1009 /* Get access to first message in receive queue */
1010
1011 buf = skb_peek(&sock->sk->sk_receive_queue);
1012 msg = buf_msg(buf);
1013 sz = msg_data_sz(msg);
1014 err = msg_errcode(msg);
1015
1016 /* Discard an empty non-errored message & try again */
1017
1018 if ((!sz) && (!err)) {
1019 advance_queue(tsock);
1020 goto restart;
1021 }
1022
1023 /* Optionally capture sender's address & ancillary data of first msg */
1024
1025 if (sz_copied == 0) {
1026 set_orig_addr(m, msg);
1027 if ((res = anc_data_recv(m, msg, tsock->p)))
1028 goto exit;
1029 }
1030
1031 /* Capture message data (if valid) & compute return value (always) */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001032
Per Lidenb97bf3f2006-01-02 19:04:38 +01001033 if (!err) {
1034 buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001035 sz = skb_tail_pointer(buf) - buf_crs;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001036
1037 needed = (buf_len - sz_copied);
1038 sz_to_copy = (sz <= needed) ? sz : needed;
1039 if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) {
1040 res = -EFAULT;
1041 goto exit;
1042 }
1043 sz_copied += sz_to_copy;
1044
1045 if (sz_to_copy < sz) {
1046 if (!(flags & MSG_PEEK))
1047 TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy;
1048 goto exit;
1049 }
1050
1051 crs += sz_to_copy;
1052 } else {
1053 if (sz_copied != 0)
1054 goto exit; /* can't add error msg to valid data */
1055
1056 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1057 res = 0;
1058 else
1059 res = -ECONNRESET;
1060 }
1061
1062 /* Consume received message (optional) */
1063
1064 if (likely(!(flags & MSG_PEEK))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001065 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1066 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001067 advance_queue(tsock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001068 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001069
1070 /* Loop around if more data is required */
1071
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001072 if ((sz_copied < buf_len) /* didn't get all requested data */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001073 && (flags & MSG_WAITALL) /* ... and need to wait for more */
1074 && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */
1075 && (!err) /* ... and haven't reached a FIN */
1076 )
1077 goto restart;
1078
1079exit:
1080 up(&tsock->sem);
Allan Stephensa3b0a5a2006-06-25 23:48:22 -07001081 return sz_copied ? sz_copied : res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001082}
1083
1084/**
1085 * queue_overloaded - test if queue overload condition exists
1086 * @queue_size: current size of queue
1087 * @base: nominal maximum size of queue
1088 * @msg: message to be added to queue
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001089 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001090 * Returns 1 if queue is currently overloaded, 0 otherwise
1091 */
1092
1093static int queue_overloaded(u32 queue_size, u32 base, struct tipc_msg *msg)
1094{
1095 u32 threshold;
1096 u32 imp = msg_importance(msg);
1097
1098 if (imp == TIPC_LOW_IMPORTANCE)
1099 threshold = base;
1100 else if (imp == TIPC_MEDIUM_IMPORTANCE)
1101 threshold = base * 2;
1102 else if (imp == TIPC_HIGH_IMPORTANCE)
1103 threshold = base * 100;
1104 else
1105 return 0;
1106
1107 if (msg_connected(msg))
1108 threshold *= 4;
1109
1110 return (queue_size > threshold);
1111}
1112
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001113/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001114 * async_disconnect - wrapper function used to disconnect port
1115 * @portref: TIPC port reference (passed as pointer-sized value)
1116 */
1117
1118static void async_disconnect(unsigned long portref)
1119{
1120 tipc_disconnect((u32)portref);
1121}
1122
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001123/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001124 * dispatch - handle arriving message
1125 * @tport: TIPC port that received message
1126 * @buf: message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001127 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001128 * Called with port locked. Must not take socket lock to avoid deadlock risk.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001129 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001130 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1131 */
1132
1133static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1134{
1135 struct tipc_msg *msg = buf_msg(buf);
1136 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle;
1137 struct socket *sock;
1138 u32 recv_q_len;
1139
1140 /* Reject message if socket is closing */
1141
1142 if (!tsock)
1143 return TIPC_ERR_NO_PORT;
1144
1145 /* Reject message if it is wrong sort of message for socket */
1146
1147 /*
1148 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
1149 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
1150 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
1151 */
1152 sock = tsock->sk.sk_socket;
1153 if (sock->state == SS_READY) {
1154 if (msg_connected(msg)) {
1155 msg_dbg(msg, "dispatch filter 1\n");
1156 return TIPC_ERR_NO_PORT;
1157 }
1158 } else {
1159 if (msg_mcast(msg)) {
1160 msg_dbg(msg, "dispatch filter 2\n");
1161 return TIPC_ERR_NO_PORT;
1162 }
1163 if (sock->state == SS_CONNECTED) {
1164 if (!msg_connected(msg)) {
1165 msg_dbg(msg, "dispatch filter 3\n");
1166 return TIPC_ERR_NO_PORT;
1167 }
1168 }
1169 else if (sock->state == SS_CONNECTING) {
1170 if (!msg_connected(msg) && (msg_errcode(msg) == 0)) {
1171 msg_dbg(msg, "dispatch filter 4\n");
1172 return TIPC_ERR_NO_PORT;
1173 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001174 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001175 else if (sock->state == SS_LISTENING) {
1176 if (msg_connected(msg) || msg_errcode(msg)) {
1177 msg_dbg(msg, "dispatch filter 5\n");
1178 return TIPC_ERR_NO_PORT;
1179 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001180 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001181 else if (sock->state == SS_DISCONNECTING) {
1182 msg_dbg(msg, "dispatch filter 6\n");
1183 return TIPC_ERR_NO_PORT;
1184 }
1185 else /* (sock->state == SS_UNCONNECTED) */ {
1186 if (msg_connected(msg) || msg_errcode(msg)) {
1187 msg_dbg(msg, "dispatch filter 7\n");
1188 return TIPC_ERR_NO_PORT;
1189 }
1190 }
1191 }
1192
1193 /* Reject message if there isn't room to queue it */
1194
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001195 if (unlikely((u32)atomic_read(&tipc_queue_size) >
Per Lidenb97bf3f2006-01-02 19:04:38 +01001196 OVERLOAD_LIMIT_BASE)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001197 if (queue_overloaded(atomic_read(&tipc_queue_size),
Per Lidenb97bf3f2006-01-02 19:04:38 +01001198 OVERLOAD_LIMIT_BASE, msg))
1199 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001200 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001201 recv_q_len = skb_queue_len(&tsock->sk.sk_receive_queue);
1202 if (unlikely(recv_q_len > (OVERLOAD_LIMIT_BASE / 2))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001203 if (queue_overloaded(recv_q_len,
1204 OVERLOAD_LIMIT_BASE / 2, msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001205 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001206 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001207
1208 /* Initiate connection termination for an incoming 'FIN' */
1209
1210 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
1211 sock->state = SS_DISCONNECTING;
1212 /* Note: Use signal since port lock is already taken! */
Per Liden4323add2006-01-18 00:38:21 +01001213 tipc_k_signal((Handler)async_disconnect, tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001214 }
1215
1216 /* Enqueue message (finally!) */
1217
1218 msg_dbg(msg,"<DISP<: ");
1219 TIPC_SKB_CB(buf)->handle = msg_data(msg);
1220 atomic_inc(&tipc_queue_size);
1221 skb_queue_tail(&sock->sk->sk_receive_queue, buf);
1222
Allan Stephenscfb0c082006-10-16 21:47:18 -07001223 if (waitqueue_active(sock->sk->sk_sleep))
1224 wake_up_interruptible(sock->sk->sk_sleep);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001225 return TIPC_OK;
1226}
1227
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001228/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001229 * wakeupdispatch - wake up port after congestion
1230 * @tport: port to wakeup
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001231 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001232 * Called with port lock on.
1233 */
1234
1235static void wakeupdispatch(struct tipc_port *tport)
1236{
1237 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle;
1238
Allan Stephenscfb0c082006-10-16 21:47:18 -07001239 if (waitqueue_active(tsock->sk.sk_sleep))
1240 wake_up_interruptible(tsock->sk.sk_sleep);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001241}
1242
1243/**
1244 * connect - establish a connection to another TIPC port
1245 * @sock: socket structure
1246 * @dest: socket address for destination port
1247 * @destlen: size of socket address data structure
1248 * @flags: (unused)
1249 *
1250 * Returns 0 on success, errno otherwise
1251 */
1252
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001253static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001254 int flags)
1255{
1256 struct tipc_sock *tsock = tipc_sk(sock->sk);
1257 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001258 struct msghdr m = {NULL,};
Per Lidenb97bf3f2006-01-02 19:04:38 +01001259 struct sk_buff *buf;
1260 struct tipc_msg *msg;
1261 int res;
1262
1263 /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */
1264
1265 if (sock->state == SS_READY)
1266 return -EOPNOTSUPP;
1267
Allan Stephens51f9cc12006-06-25 23:49:06 -07001268 /* Issue Posix-compliant error code if socket is in the wrong state */
1269
Per Lidenb97bf3f2006-01-02 19:04:38 +01001270 if (sock->state == SS_LISTENING)
1271 return -EOPNOTSUPP;
1272 if (sock->state == SS_CONNECTING)
1273 return -EALREADY;
1274 if (sock->state != SS_UNCONNECTED)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001275 return -EISCONN;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001276
Allan Stephens51f9cc12006-06-25 23:49:06 -07001277 /*
1278 * Reject connection attempt using multicast address
1279 *
1280 * Note: send_msg() validates the rest of the address fields,
1281 * so there's no need to do it here
1282 */
1283
1284 if (dst->addrtype == TIPC_ADDR_MCAST)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001285 return -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001286
1287 /* Send a 'SYN-' to destination */
1288
1289 m.msg_name = dest;
Allan Stephens51f9cc12006-06-25 23:49:06 -07001290 m.msg_namelen = destlen;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001291 if ((res = send_msg(NULL, sock, &m, 0)) < 0) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001292 sock->state = SS_DISCONNECTING;
1293 return res;
1294 }
1295
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001296 if (down_interruptible(&tsock->sem))
1297 return -ERESTARTSYS;
1298
Per Lidenb97bf3f2006-01-02 19:04:38 +01001299 /* Wait for destination's 'ACK' response */
1300
1301 res = wait_event_interruptible_timeout(*sock->sk->sk_sleep,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001302 skb_queue_len(&sock->sk->sk_receive_queue),
Per Lidenb97bf3f2006-01-02 19:04:38 +01001303 sock->sk->sk_rcvtimeo);
1304 buf = skb_peek(&sock->sk->sk_receive_queue);
1305 if (res > 0) {
1306 msg = buf_msg(buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001307 res = auto_connect(sock, tsock, msg);
1308 if (!res) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001309 if (!msg_data_sz(msg))
1310 advance_queue(tsock);
1311 }
1312 } else {
1313 if (res == 0) {
1314 res = -ETIMEDOUT;
1315 } else
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001316 { /* leave "res" unchanged */ }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001317 sock->state = SS_DISCONNECTING;
1318 }
1319
1320 up(&tsock->sem);
1321 return res;
1322}
1323
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001324/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001325 * listen - allow socket to listen for incoming connections
1326 * @sock: socket structure
1327 * @len: (unused)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001328 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001329 * Returns 0 on success, errno otherwise
1330 */
1331
1332static int listen(struct socket *sock, int len)
1333{
1334 /* REQUIRES SOCKET LOCKING OF SOME SORT? */
1335
1336 if (sock->state == SS_READY)
1337 return -EOPNOTSUPP;
1338 if (sock->state != SS_UNCONNECTED)
1339 return -EINVAL;
1340 sock->state = SS_LISTENING;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001341 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001342}
1343
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001344/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001345 * accept - wait for connection request
1346 * @sock: listening socket
1347 * @newsock: new socket that is to be connected
1348 * @flags: file-related flags associated with socket
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001349 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001350 * Returns 0 on success, errno otherwise
1351 */
1352
1353static int accept(struct socket *sock, struct socket *newsock, int flags)
1354{
1355 struct tipc_sock *tsock = tipc_sk(sock->sk);
1356 struct sk_buff *buf;
1357 int res = -EFAULT;
1358
1359 if (sock->state == SS_READY)
1360 return -EOPNOTSUPP;
1361 if (sock->state != SS_LISTENING)
1362 return -EINVAL;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001363
1364 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001365 (flags & O_NONBLOCK)))
1366 return -EWOULDBLOCK;
1367
1368 if (down_interruptible(&tsock->sem))
1369 return -ERESTARTSYS;
1370
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001371 if (wait_event_interruptible(*sock->sk->sk_sleep,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001372 skb_queue_len(&sock->sk->sk_receive_queue))) {
1373 res = -ERESTARTSYS;
1374 goto exit;
1375 }
1376 buf = skb_peek(&sock->sk->sk_receive_queue);
1377
Eric W. Biederman1b8d7ae2007-10-08 23:24:22 -07001378 res = tipc_create(sock->sk->sk_net, newsock, 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001379 if (!res) {
1380 struct tipc_sock *new_tsock = tipc_sk(newsock->sk);
1381 struct tipc_portid id;
1382 struct tipc_msg *msg = buf_msg(buf);
1383 u32 new_ref = new_tsock->p->ref;
1384
1385 id.ref = msg_origport(msg);
1386 id.node = msg_orignode(msg);
1387 tipc_connect2port(new_ref, &id);
1388 newsock->state = SS_CONNECTED;
1389
1390 tipc_set_portimportance(new_ref, msg_importance(msg));
1391 if (msg_named(msg)) {
1392 new_tsock->p->conn_type = msg_nametype(msg);
1393 new_tsock->p->conn_instance = msg_nameinst(msg);
1394 }
1395
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001396 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001397 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1398 * Respond to 'SYN+' by queuing it on new socket.
1399 */
1400
1401 msg_dbg(msg,"<ACC<: ");
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001402 if (!msg_data_sz(msg)) {
1403 struct msghdr m = {NULL,};
Per Lidenb97bf3f2006-01-02 19:04:38 +01001404
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001405 send_packet(NULL, newsock, &m, 0);
1406 advance_queue(tsock);
1407 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001408 sock_lock(tsock);
1409 skb_dequeue(&sock->sk->sk_receive_queue);
1410 sock_unlock(tsock);
1411 skb_queue_head(&newsock->sk->sk_receive_queue, buf);
1412 }
1413 }
1414exit:
1415 up(&tsock->sem);
1416 return res;
1417}
1418
1419/**
1420 * shutdown - shutdown socket connection
1421 * @sock: socket structure
Allan Stephense9024f02006-06-25 23:43:57 -07001422 * @how: direction to close (unused; always treated as read + write)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001423 *
1424 * Terminates connection (if necessary), then purges socket's receive queue.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001425 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001426 * Returns 0 on success, errno otherwise
1427 */
1428
1429static int shutdown(struct socket *sock, int how)
1430{
1431 struct tipc_sock* tsock = tipc_sk(sock->sk);
1432 struct sk_buff *buf;
1433 int res;
1434
1435 /* Could return -EINVAL for an invalid "how", but why bother? */
1436
1437 if (down_interruptible(&tsock->sem))
1438 return -ERESTARTSYS;
1439
1440 sock_lock(tsock);
1441
1442 switch (sock->state) {
1443 case SS_CONNECTED:
1444
1445 /* Send 'FIN+' or 'FIN-' message to peer */
1446
1447 sock_unlock(tsock);
1448restart:
1449 if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
1450 atomic_dec(&tipc_queue_size);
1451 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) {
1452 buf_discard(buf);
1453 goto restart;
1454 }
1455 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1456 }
1457 else {
1458 tipc_shutdown(tsock->p->ref);
1459 }
1460 sock_lock(tsock);
1461
1462 /* fall through */
1463
1464 case SS_DISCONNECTING:
1465
1466 /* Discard any unreceived messages */
1467
1468 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
1469 atomic_dec(&tipc_queue_size);
1470 buf_discard(buf);
1471 }
1472 tsock->p->conn_unacked = 0;
1473
1474 /* fall through */
1475
1476 case SS_CONNECTING:
1477 sock->state = SS_DISCONNECTING;
1478 res = 0;
1479 break;
1480
1481 default:
1482 res = -ENOTCONN;
1483 }
1484
1485 sock_unlock(tsock);
1486
1487 up(&tsock->sem);
1488 return res;
1489}
1490
1491/**
1492 * setsockopt - set socket option
1493 * @sock: socket structure
1494 * @lvl: option level
1495 * @opt: option identifier
1496 * @ov: pointer to new option value
1497 * @ol: length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001498 *
1499 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001500 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001501 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001502 * Returns 0 on success, errno otherwise
1503 */
1504
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001505static int setsockopt(struct socket *sock,
Allan Stephense9024f02006-06-25 23:43:57 -07001506 int lvl, int opt, char __user *ov, int ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001507{
1508 struct tipc_sock *tsock = tipc_sk(sock->sk);
1509 u32 value;
1510 int res;
1511
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001512 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1513 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001514 if (lvl != SOL_TIPC)
1515 return -ENOPROTOOPT;
1516 if (ol < sizeof(value))
1517 return -EINVAL;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001518 if ((res = get_user(value, (u32 __user *)ov)))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001519 return res;
1520
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001521 if (down_interruptible(&tsock->sem))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001522 return -ERESTARTSYS;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001523
Per Lidenb97bf3f2006-01-02 19:04:38 +01001524 switch (opt) {
1525 case TIPC_IMPORTANCE:
1526 res = tipc_set_portimportance(tsock->p->ref, value);
1527 break;
1528 case TIPC_SRC_DROPPABLE:
1529 if (sock->type != SOCK_STREAM)
1530 res = tipc_set_portunreliable(tsock->p->ref, value);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001531 else
Per Lidenb97bf3f2006-01-02 19:04:38 +01001532 res = -ENOPROTOOPT;
1533 break;
1534 case TIPC_DEST_DROPPABLE:
1535 res = tipc_set_portunreturnable(tsock->p->ref, value);
1536 break;
1537 case TIPC_CONN_TIMEOUT:
1538 sock->sk->sk_rcvtimeo = (value * HZ / 1000);
1539 break;
1540 default:
1541 res = -EINVAL;
1542 }
1543
1544 up(&tsock->sem);
1545 return res;
1546}
1547
1548/**
1549 * getsockopt - get socket option
1550 * @sock: socket structure
1551 * @lvl: option level
1552 * @opt: option identifier
1553 * @ov: receptacle for option value
1554 * @ol: receptacle for length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001555 *
1556 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001557 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001558 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001559 * Returns 0 on success, errno otherwise
1560 */
1561
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001562static int getsockopt(struct socket *sock,
Al Viro28c4dad2006-10-10 22:45:57 +01001563 int lvl, int opt, char __user *ov, int __user *ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001564{
1565 struct tipc_sock *tsock = tipc_sk(sock->sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001566 int len;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001567 u32 value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001568 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001569
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001570 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1571 return put_user(0, ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001572 if (lvl != SOL_TIPC)
1573 return -ENOPROTOOPT;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001574 if ((res = get_user(len, ol)))
1575 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001576
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001577 if (down_interruptible(&tsock->sem))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001578 return -ERESTARTSYS;
1579
1580 switch (opt) {
1581 case TIPC_IMPORTANCE:
1582 res = tipc_portimportance(tsock->p->ref, &value);
1583 break;
1584 case TIPC_SRC_DROPPABLE:
1585 res = tipc_portunreliable(tsock->p->ref, &value);
1586 break;
1587 case TIPC_DEST_DROPPABLE:
1588 res = tipc_portunreturnable(tsock->p->ref, &value);
1589 break;
1590 case TIPC_CONN_TIMEOUT:
1591 value = (sock->sk->sk_rcvtimeo * 1000) / HZ;
1592 break;
1593 default:
1594 res = -EINVAL;
1595 }
1596
1597 if (res) {
1598 /* "get" failed */
1599 }
1600 else if (len < sizeof(value)) {
1601 res = -EINVAL;
1602 }
1603 else if ((res = copy_to_user(ov, &value, sizeof(value)))) {
1604 /* couldn't return value */
1605 }
1606 else {
1607 res = put_user(sizeof(value), ol);
1608 }
1609
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001610 up(&tsock->sem);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001611 return res;
1612}
1613
1614/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001615 * Protocol switches for the various types of TIPC sockets
1616 */
1617
1618static struct proto_ops msg_ops = {
1619 .owner = THIS_MODULE,
1620 .family = AF_TIPC,
1621 .release = release,
1622 .bind = bind,
1623 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001624 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001625 .accept = accept,
1626 .getname = get_name,
1627 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001628 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001629 .listen = listen,
1630 .shutdown = shutdown,
1631 .setsockopt = setsockopt,
1632 .getsockopt = getsockopt,
1633 .sendmsg = send_msg,
1634 .recvmsg = recv_msg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001635 .mmap = sock_no_mmap,
1636 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001637};
1638
1639static struct proto_ops packet_ops = {
1640 .owner = THIS_MODULE,
1641 .family = AF_TIPC,
1642 .release = release,
1643 .bind = bind,
1644 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001645 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001646 .accept = accept,
1647 .getname = get_name,
1648 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001649 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001650 .listen = listen,
1651 .shutdown = shutdown,
1652 .setsockopt = setsockopt,
1653 .getsockopt = getsockopt,
1654 .sendmsg = send_packet,
1655 .recvmsg = recv_msg,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001656 .mmap = sock_no_mmap,
1657 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001658};
1659
1660static struct proto_ops stream_ops = {
1661 .owner = THIS_MODULE,
1662 .family = AF_TIPC,
1663 .release = release,
1664 .bind = bind,
1665 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001666 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001667 .accept = accept,
1668 .getname = get_name,
1669 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001670 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001671 .listen = listen,
1672 .shutdown = shutdown,
1673 .setsockopt = setsockopt,
1674 .getsockopt = getsockopt,
1675 .sendmsg = send_stream,
1676 .recvmsg = recv_stream,
YOSHIFUJI Hideaki82387452007-07-19 10:44:56 +09001677 .mmap = sock_no_mmap,
1678 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001679};
1680
1681static struct net_proto_family tipc_family_ops = {
1682 .owner = THIS_MODULE,
1683 .family = AF_TIPC,
1684 .create = tipc_create
1685};
1686
1687static struct proto tipc_proto = {
1688 .name = "TIPC",
1689 .owner = THIS_MODULE,
1690 .obj_size = sizeof(struct tipc_sock)
1691};
1692
1693/**
Per Liden4323add2006-01-18 00:38:21 +01001694 * tipc_socket_init - initialize TIPC socket interface
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001695 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001696 * Returns 0 on success, errno otherwise
1697 */
Per Liden4323add2006-01-18 00:38:21 +01001698int tipc_socket_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001699{
1700 int res;
1701
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001702 res = proto_register(&tipc_proto, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001703 if (res) {
Per Lidend0a14a92006-01-11 13:52:51 +01001704 err("Failed to register TIPC protocol type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001705 goto out;
1706 }
1707
1708 res = sock_register(&tipc_family_ops);
1709 if (res) {
Per Lidend0a14a92006-01-11 13:52:51 +01001710 err("Failed to register TIPC socket type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001711 proto_unregister(&tipc_proto);
1712 goto out;
1713 }
1714
1715 sockets_enabled = 1;
1716 out:
1717 return res;
1718}
1719
1720/**
Per Liden4323add2006-01-18 00:38:21 +01001721 * tipc_socket_stop - stop TIPC socket interface
Per Lidenb97bf3f2006-01-02 19:04:38 +01001722 */
Per Liden4323add2006-01-18 00:38:21 +01001723void tipc_socket_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001724{
1725 if (!sockets_enabled)
1726 return;
1727
1728 sockets_enabled = 0;
1729 sock_unregister(tipc_family_ops.family);
1730 proto_unregister(&tipc_proto);
1731}
1732