blob: 4a8f37f48764e336e6b856ce3b103e2870c20671 [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 */
165static int tipc_create(struct socket *sock, int protocol)
166{
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
Per Lidenb97bf3f2006-01-02 19:04:38 +0100172 if (unlikely(protocol != 0))
173 return -EPROTONOSUPPORT;
174
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800175 ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100176 if (unlikely(!ref))
177 return -ENOMEM;
178
179 sock->state = SS_UNCONNECTED;
180
181 switch (sock->type) {
182 case SOCK_STREAM:
183 sock->ops = &stream_ops;
184 break;
185 case SOCK_SEQPACKET:
186 sock->ops = &packet_ops;
187 break;
188 case SOCK_DGRAM:
189 tipc_set_portunreliable(ref, 1);
190 /* fall through */
191 case SOCK_RDM:
192 tipc_set_portunreturnable(ref, 1);
193 sock->ops = &msg_ops;
194 sock->state = SS_READY;
195 break;
Allan Stephens49978652006-06-25 23:47:18 -0700196 default:
197 tipc_deleteport(ref);
198 return -EPROTOTYPE;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100199 }
200
201 sk = sk_alloc(AF_TIPC, GFP_KERNEL, &tipc_proto, 1);
202 if (!sk) {
203 tipc_deleteport(ref);
204 return -ENOMEM;
205 }
206
207 sock_init_data(sock, sk);
208 init_waitqueue_head(sk->sk_sleep);
209 sk->sk_rcvtimeo = 8 * HZ; /* default connect timeout = 8s */
210
211 tsock = tipc_sk(sk);
212 port = tipc_get_port(ref);
213
214 tsock->p = port;
215 port->usr_handle = tsock;
216
217 init_MUTEX(&tsock->sem);
218
219 dbg("sock_create: %x\n",tsock);
220
221 atomic_inc(&tipc_user_count);
222
223 return 0;
224}
225
226/**
227 * release - destroy a TIPC socket
228 * @sock: socket to destroy
229 *
230 * This routine cleans up any messages that are still queued on the socket.
231 * For DGRAM and RDM socket types, all queued messages are rejected.
232 * For SEQPACKET and STREAM socket types, the first message is rejected
233 * and any others are discarded. (If the first message on a STREAM socket
234 * is partially-read, it is discarded and the next one is rejected instead.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900235 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100236 * NOTE: Rejected messages are not necessarily returned to the sender! They
237 * are returned or discarded according to the "destination droppable" setting
238 * specified for the message by the sender.
239 *
240 * Returns 0 on success, errno otherwise
241 */
242
243static int release(struct socket *sock)
244{
245 struct tipc_sock *tsock = tipc_sk(sock->sk);
246 struct sock *sk = sock->sk;
247 int res = TIPC_OK;
248 struct sk_buff *buf;
249
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900250 dbg("sock_delete: %x\n",tsock);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100251 if (!tsock)
252 return 0;
253 down_interruptible(&tsock->sem);
254 if (!sock->sk) {
255 up(&tsock->sem);
256 return 0;
257 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900258
Per Lidenb97bf3f2006-01-02 19:04:38 +0100259 /* Reject unreceived messages, unless no longer connected */
260
261 while (sock->state != SS_DISCONNECTING) {
262 sock_lock(tsock);
263 buf = skb_dequeue(&sk->sk_receive_queue);
264 if (!buf)
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800265 tsock->p->usr_handle = NULL;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100266 sock_unlock(tsock);
267 if (!buf)
268 break;
269 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf)))
270 buf_discard(buf);
271 else
272 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
273 atomic_dec(&tipc_queue_size);
274 }
275
276 /* Delete TIPC port */
277
278 res = tipc_deleteport(tsock->p->ref);
279 sock->sk = NULL;
280
281 /* Discard any remaining messages */
282
283 while ((buf = skb_dequeue(&sk->sk_receive_queue))) {
284 buf_discard(buf);
285 atomic_dec(&tipc_queue_size);
286 }
287
288 up(&tsock->sem);
289
290 sock_put(sk);
291
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900292 atomic_dec(&tipc_user_count);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100293 return res;
294}
295
296/**
297 * bind - associate or disassocate TIPC name(s) with a socket
298 * @sock: socket structure
299 * @uaddr: socket address describing name(s) and desired operation
300 * @uaddr_len: size of socket address data structure
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900301 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100302 * Name and name sequence binding is indicated using a positive scope value;
303 * a negative scope value unbinds the specified name. Specifying no name
304 * (i.e. a socket address length of 0) unbinds all names from the socket.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900305 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100306 * Returns 0 on success, errno otherwise
307 */
308
309static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
310{
311 struct tipc_sock *tsock = tipc_sk(sock->sk);
312 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
313 int res;
314
315 if (down_interruptible(&tsock->sem))
316 return -ERESTARTSYS;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900317
Per Lidenb97bf3f2006-01-02 19:04:38 +0100318 if (unlikely(!uaddr_len)) {
Sam Ravnborg1fc54d82006-03-20 22:36:47 -0800319 res = tipc_withdraw(tsock->p->ref, 0, NULL);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100320 goto exit;
321 }
322
323 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
324 res = -EINVAL;
325 goto exit;
326 }
327
328 if (addr->family != AF_TIPC) {
329 res = -EAFNOSUPPORT;
330 goto exit;
331 }
332 if (addr->addrtype == TIPC_ADDR_NAME)
333 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
334 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
335 res = -EAFNOSUPPORT;
336 goto exit;
337 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900338
339 if (addr->scope > 0)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100340 res = tipc_publish(tsock->p->ref, addr->scope,
341 &addr->addr.nameseq);
342 else
343 res = tipc_withdraw(tsock->p->ref, -addr->scope,
344 &addr->addr.nameseq);
345exit:
346 up(&tsock->sem);
347 return res;
348}
349
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900350/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100351 * get_name - get port ID of socket or peer socket
352 * @sock: socket structure
353 * @uaddr: area for returned socket address
354 * @uaddr_len: area for returned length of socket address
355 * @peer: 0 to obtain socket name, 1 to obtain peer socket name
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900356 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100357 * Returns 0 on success, errno otherwise
358 */
359
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900360static int get_name(struct socket *sock, struct sockaddr *uaddr,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100361 int *uaddr_len, int peer)
362{
363 struct tipc_sock *tsock = tipc_sk(sock->sk);
364 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
365 u32 res;
366
367 if (down_interruptible(&tsock->sem))
368 return -ERESTARTSYS;
369
370 *uaddr_len = sizeof(*addr);
371 addr->addrtype = TIPC_ADDR_ID;
372 addr->family = AF_TIPC;
373 addr->scope = 0;
374 if (peer)
375 res = tipc_peer(tsock->p->ref, &addr->addr.id);
376 else
377 res = tipc_ownidentity(tsock->p->ref, &addr->addr.id);
378 addr->addr.name.domain = 0;
379
380 up(&tsock->sem);
381 return res;
382}
383
384/**
385 * poll - read and possibly block on pollmask
386 * @file: file structure associated with the socket
387 * @sock: socket for which to calculate the poll bits
388 * @wait: ???
389 *
390 * Returns the pollmask
391 */
392
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900393static unsigned int poll(struct file *file, struct socket *sock,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100394 poll_table *wait)
395{
396 poll_wait(file, sock->sk->sk_sleep, wait);
397 /* NEED LOCK HERE? */
398 return pollmask(sock);
399}
400
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900401/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100402 * dest_name_check - verify user is permitted to send to specified port name
403 * @dest: destination address
404 * @m: descriptor for message to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900405 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100406 * Prevents restricted configuration commands from being issued by
407 * unauthorized users.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900408 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100409 * Returns 0 if permission is granted, otherwise errno
410 */
411
Sam Ravnborg05790c62006-03-20 22:37:04 -0800412static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100413{
414 struct tipc_cfg_msg_hdr hdr;
415
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900416 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
417 return 0;
418 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
419 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100420
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900421 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
422 return -EACCES;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100423
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900424 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100425 return -EFAULT;
Allan Stephens70cb2342006-06-25 23:41:47 -0700426 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100427 return -EACCES;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900428
Per Lidenb97bf3f2006-01-02 19:04:38 +0100429 return 0;
430}
431
432/**
433 * send_msg - send message in connectionless manner
434 * @iocb: (unused)
435 * @sock: socket structure
436 * @m: message to send
Allan Stephense9024f0f2006-06-25 23:43:57 -0700437 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900438 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100439 * Message must have an destination specified explicitly.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900440 * Used for SOCK_RDM and SOCK_DGRAM messages,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100441 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
442 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900443 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100444 * Returns the number of bytes sent on success, or errno otherwise
445 */
446
447static int send_msg(struct kiocb *iocb, struct socket *sock,
448 struct msghdr *m, size_t total_len)
449{
450 struct tipc_sock *tsock = tipc_sk(sock->sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900451 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100452 struct sk_buff *buf;
453 int needs_conn;
454 int res = -EINVAL;
455
456 if (unlikely(!dest))
457 return -EDESTADDRREQ;
Allan Stephens51f9cc12006-06-25 23:49:06 -0700458 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
459 (dest->family != AF_TIPC)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100460 return -EINVAL;
461
462 needs_conn = (sock->state != SS_READY);
463 if (unlikely(needs_conn)) {
464 if (sock->state == SS_LISTENING)
465 return -EPIPE;
466 if (sock->state != SS_UNCONNECTED)
467 return -EISCONN;
468 if ((tsock->p->published) ||
469 ((sock->type == SOCK_STREAM) && (total_len != 0)))
470 return -EOPNOTSUPP;
Allan Stephens33880072006-06-25 23:44:57 -0700471 if (dest->addrtype == TIPC_ADDR_NAME) {
472 tsock->p->conn_type = dest->addr.name.name.type;
473 tsock->p->conn_instance = dest->addr.name.name.instance;
474 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100475 }
476
477 if (down_interruptible(&tsock->sem))
478 return -ERESTARTSYS;
479
480 if (needs_conn) {
481
482 /* Abort any pending connection attempts (very unlikely) */
483
484 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
485 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
486 atomic_dec(&tipc_queue_size);
487 }
488
489 sock->state = SS_CONNECTING;
490 }
491
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900492 do {
493 if (dest->addrtype == TIPC_ADDR_NAME) {
494 if ((res = dest_name_check(dest, m)))
495 goto exit;
496 res = tipc_send2name(tsock->p->ref,
497 &dest->addr.name.name,
498 dest->addr.name.domain,
499 m->msg_iovlen,
500 m->msg_iov);
501 }
502 else if (dest->addrtype == TIPC_ADDR_ID) {
503 res = tipc_send2port(tsock->p->ref,
504 &dest->addr.id,
505 m->msg_iovlen,
506 m->msg_iov);
507 }
508 else if (dest->addrtype == TIPC_ADDR_MCAST) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100509 if (needs_conn) {
510 res = -EOPNOTSUPP;
511 goto exit;
512 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900513 if ((res = dest_name_check(dest, m)))
514 goto exit;
515 res = tipc_multicast(tsock->p->ref,
516 &dest->addr.nameseq,
517 0,
518 m->msg_iovlen,
519 m->msg_iov);
520 }
521 if (likely(res != -ELINKCONG)) {
522exit:
523 up(&tsock->sem);
524 return res;
525 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100526 if (m->msg_flags & MSG_DONTWAIT) {
527 res = -EWOULDBLOCK;
528 goto exit;
529 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900530 if (wait_event_interruptible(*sock->sk->sk_sleep,
531 !tsock->p->congested)) {
532 res = -ERESTARTSYS;
533 goto exit;
534 }
535 } while (1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100536}
537
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900538/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100539 * send_packet - send a connection-oriented message
540 * @iocb: (unused)
541 * @sock: socket structure
542 * @m: message to send
Allan Stephense9024f0f2006-06-25 23:43:57 -0700543 * @total_len: length of message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900544 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100545 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900546 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100547 * Returns the number of bytes sent on success, or errno otherwise
548 */
549
550static int send_packet(struct kiocb *iocb, struct socket *sock,
551 struct msghdr *m, size_t total_len)
552{
553 struct tipc_sock *tsock = tipc_sk(sock->sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900554 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100555 int res;
556
557 /* Handle implied connection establishment */
558
559 if (unlikely(dest))
560 return send_msg(iocb, sock, m, total_len);
561
562 if (down_interruptible(&tsock->sem)) {
563 return -ERESTARTSYS;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900564 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100565
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900566 do {
Allan Stephensbdd94782006-06-25 23:45:53 -0700567 if (unlikely(sock->state != SS_CONNECTED)) {
568 if (sock->state == SS_DISCONNECTING)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900569 res = -EPIPE;
Allan Stephensbdd94782006-06-25 23:45:53 -0700570 else
571 res = -ENOTCONN;
572 goto exit;
573 }
574
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900575 res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov);
576 if (likely(res != -ELINKCONG)) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100577exit:
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900578 up(&tsock->sem);
579 return res;
580 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100581 if (m->msg_flags & MSG_DONTWAIT) {
582 res = -EWOULDBLOCK;
583 goto exit;
584 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900585 if (wait_event_interruptible(*sock->sk->sk_sleep,
586 !tsock->p->congested)) {
587 res = -ERESTARTSYS;
588 goto exit;
589 }
590 } while (1);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100591}
592
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900593/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100594 * send_stream - send stream-oriented data
595 * @iocb: (unused)
596 * @sock: socket structure
597 * @m: data to send
598 * @total_len: total length of data to be sent
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900599 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100600 * Used for SOCK_STREAM data.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900601 *
602 * Returns the number of bytes sent on success (or partial success),
Allan Stephens1303e8f2006-06-25 23:46:50 -0700603 * or errno if no data sent
Per Lidenb97bf3f2006-01-02 19:04:38 +0100604 */
605
606
607static int send_stream(struct kiocb *iocb, struct socket *sock,
608 struct msghdr *m, size_t total_len)
609{
Allan Stephens05646c92007-06-10 17:25:24 -0700610 struct tipc_port *tport;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100611 struct msghdr my_msg;
612 struct iovec my_iov;
613 struct iovec *curr_iov;
614 int curr_iovlen;
615 char __user *curr_start;
Allan Stephens05646c92007-06-10 17:25:24 -0700616 u32 hdr_size;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100617 int curr_left;
618 int bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700619 int bytes_sent;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100620 int res;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900621
Allan Stephens05646c92007-06-10 17:25:24 -0700622 /* Handle special cases where there is no connection */
Per Lidenb97bf3f2006-01-02 19:04:38 +0100623
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900624 if (unlikely(sock->state != SS_CONNECTED)) {
Allan Stephens05646c92007-06-10 17:25:24 -0700625 if (sock->state == SS_UNCONNECTED)
626 return send_packet(iocb, sock, m, total_len);
627 else if (sock->state == SS_DISCONNECTING)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900628 return -EPIPE;
629 else
630 return -ENOTCONN;
631 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100632
Allan Stephenseb5959c2006-10-16 21:43:54 -0700633 if (unlikely(m->msg_name))
634 return -EISCONN;
635
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900636 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +0100637 * Send each iovec entry using one or more messages
638 *
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900639 * Note: This algorithm is good for the most likely case
Per Lidenb97bf3f2006-01-02 19:04:38 +0100640 * (i.e. one large iovec entry), but could be improved to pass sets
641 * of small iovec entries into send_packet().
642 */
643
Allan Stephens1303e8f2006-06-25 23:46:50 -0700644 curr_iov = m->msg_iov;
645 curr_iovlen = m->msg_iovlen;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100646 my_msg.msg_iov = &my_iov;
647 my_msg.msg_iovlen = 1;
Allan Stephenseb5959c2006-10-16 21:43:54 -0700648 my_msg.msg_flags = m->msg_flags;
649 my_msg.msg_name = NULL;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700650 bytes_sent = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100651
Allan Stephens05646c92007-06-10 17:25:24 -0700652 tport = tipc_sk(sock->sk)->p;
653 hdr_size = msg_hdr_sz(&tport->phdr);
654
Per Lidenb97bf3f2006-01-02 19:04:38 +0100655 while (curr_iovlen--) {
656 curr_start = curr_iov->iov_base;
657 curr_left = curr_iov->iov_len;
658
659 while (curr_left) {
Allan Stephens05646c92007-06-10 17:25:24 -0700660 bytes_to_send = tport->max_pkt - hdr_size;
661 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
662 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
663 if (curr_left < bytes_to_send)
664 bytes_to_send = curr_left;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100665 my_iov.iov_base = curr_start;
666 my_iov.iov_len = bytes_to_send;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900667 if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0) {
Allan Stephens05646c92007-06-10 17:25:24 -0700668 if (bytes_sent != 0)
669 res = bytes_sent;
670 return res;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700671 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100672 curr_left -= bytes_to_send;
673 curr_start += bytes_to_send;
Allan Stephens1303e8f2006-06-25 23:46:50 -0700674 bytes_sent += bytes_to_send;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100675 }
676
677 curr_iov++;
678 }
679
Allan Stephens1303e8f2006-06-25 23:46:50 -0700680 return bytes_sent;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100681}
682
683/**
684 * auto_connect - complete connection setup to a remote port
685 * @sock: socket structure
686 * @tsock: TIPC-specific socket structure
687 * @msg: peer's response message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900688 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100689 * Returns 0 on success, errno otherwise
690 */
691
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900692static int auto_connect(struct socket *sock, struct tipc_sock *tsock,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100693 struct tipc_msg *msg)
694{
695 struct tipc_portid peer;
696
697 if (msg_errcode(msg)) {
698 sock->state = SS_DISCONNECTING;
699 return -ECONNREFUSED;
700 }
701
702 peer.ref = msg_origport(msg);
703 peer.node = msg_orignode(msg);
704 tipc_connect2port(tsock->p->ref, &peer);
705 tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
706 sock->state = SS_CONNECTED;
707 return 0;
708}
709
710/**
711 * set_orig_addr - capture sender's address for received message
712 * @m: descriptor for message info
713 * @msg: received message header
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900714 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100715 * Note: Address is not captured if not requested by receiver.
716 */
717
Sam Ravnborg05790c62006-03-20 22:37:04 -0800718static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
Per Lidenb97bf3f2006-01-02 19:04:38 +0100719{
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900720 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100721
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900722 if (addr) {
Per Lidenb97bf3f2006-01-02 19:04:38 +0100723 addr->family = AF_TIPC;
724 addr->addrtype = TIPC_ADDR_ID;
725 addr->addr.id.ref = msg_origport(msg);
726 addr->addr.id.node = msg_orignode(msg);
727 addr->addr.name.domain = 0; /* could leave uninitialized */
728 addr->scope = 0; /* could leave uninitialized */
729 m->msg_namelen = sizeof(struct sockaddr_tipc);
730 }
731}
732
733/**
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900734 * anc_data_recv - optionally capture ancillary data for received message
Per Lidenb97bf3f2006-01-02 19:04:38 +0100735 * @m: descriptor for message info
736 * @msg: received message header
737 * @tport: TIPC port associated with message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900738 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100739 * Note: Ancillary data is not captured if not requested by receiver.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900740 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100741 * Returns 0 if successful, otherwise errno
742 */
743
Sam Ravnborg05790c62006-03-20 22:37:04 -0800744static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100745 struct tipc_port *tport)
746{
747 u32 anc_data[3];
748 u32 err;
749 u32 dest_type;
Allan Stephens3546c752006-06-25 23:45:24 -0700750 int has_name;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100751 int res;
752
753 if (likely(m->msg_controllen == 0))
754 return 0;
755
756 /* Optionally capture errored message object(s) */
757
758 err = msg ? msg_errcode(msg) : 0;
759 if (unlikely(err)) {
760 anc_data[0] = err;
761 anc_data[1] = msg_data_sz(msg);
Allan Stephens4b087b22006-06-25 23:47:44 -0700762 if ((res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100763 return res;
764 if (anc_data[1] &&
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900765 (res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
Per Lidenb97bf3f2006-01-02 19:04:38 +0100766 msg_data(msg))))
767 return res;
768 }
769
770 /* Optionally capture message destination object */
771
772 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
773 switch (dest_type) {
774 case TIPC_NAMED_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700775 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100776 anc_data[0] = msg_nametype(msg);
777 anc_data[1] = msg_namelower(msg);
778 anc_data[2] = msg_namelower(msg);
779 break;
780 case TIPC_MCAST_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700781 has_name = 1;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100782 anc_data[0] = msg_nametype(msg);
783 anc_data[1] = msg_namelower(msg);
784 anc_data[2] = msg_nameupper(msg);
785 break;
786 case TIPC_CONN_MSG:
Allan Stephens3546c752006-06-25 23:45:24 -0700787 has_name = (tport->conn_type != 0);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100788 anc_data[0] = tport->conn_type;
789 anc_data[1] = tport->conn_instance;
790 anc_data[2] = tport->conn_instance;
791 break;
792 default:
Allan Stephens3546c752006-06-25 23:45:24 -0700793 has_name = 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100794 }
Allan Stephens3546c752006-06-25 23:45:24 -0700795 if (has_name &&
Allan Stephens4b087b22006-06-25 23:47:44 -0700796 (res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data)))
Per Lidenb97bf3f2006-01-02 19:04:38 +0100797 return res;
798
799 return 0;
800}
801
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900802/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100803 * recv_msg - receive packet-oriented message
804 * @iocb: (unused)
805 * @m: descriptor for message info
806 * @buf_len: total size of user buffer area
807 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900808 *
Per Lidenb97bf3f2006-01-02 19:04:38 +0100809 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
810 * If the complete message doesn't fit in user area, truncate it.
811 *
812 * Returns size of returned message data, errno otherwise
813 */
814
815static int recv_msg(struct kiocb *iocb, struct socket *sock,
816 struct msghdr *m, size_t buf_len, int flags)
817{
818 struct tipc_sock *tsock = tipc_sk(sock->sk);
819 struct sk_buff *buf;
820 struct tipc_msg *msg;
821 unsigned int q_len;
822 unsigned int sz;
823 u32 err;
824 int res;
825
826 /* Currently doesn't support receiving into multiple iovec entries */
827
828 if (m->msg_iovlen != 1)
829 return -EOPNOTSUPP;
830
831 /* Catch invalid receive attempts */
832
833 if (unlikely(!buf_len))
834 return -EINVAL;
835
836 if (sock->type == SOCK_SEQPACKET) {
837 if (unlikely(sock->state == SS_UNCONNECTED))
838 return -ENOTCONN;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900839 if (unlikely((sock->state == SS_DISCONNECTING) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +0100840 (skb_queue_len(&sock->sk->sk_receive_queue) == 0)))
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900841 return -ENOTCONN;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100842 }
843
844 /* Look for a message in receive queue; wait if necessary */
845
846 if (unlikely(down_interruptible(&tsock->sem)))
847 return -ERESTARTSYS;
848
849restart:
850 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
851 (flags & MSG_DONTWAIT))) {
852 res = -EWOULDBLOCK;
853 goto exit;
854 }
855
856 if ((res = wait_event_interruptible(
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900857 *sock->sk->sk_sleep,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100858 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
859 (sock->state == SS_DISCONNECTING))) )) {
860 goto exit;
861 }
862
863 /* Catch attempt to receive on an already terminated connection */
864 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */
865
866 if (!q_len) {
867 res = -ENOTCONN;
868 goto exit;
869 }
870
871 /* Get access to first message in receive queue */
872
873 buf = skb_peek(&sock->sk->sk_receive_queue);
874 msg = buf_msg(buf);
875 sz = msg_data_sz(msg);
876 err = msg_errcode(msg);
877
878 /* Complete connection setup for an implied connect */
879
880 if (unlikely(sock->state == SS_CONNECTING)) {
881 if ((res = auto_connect(sock, tsock, msg)))
882 goto exit;
883 }
884
885 /* Discard an empty non-errored message & try again */
886
887 if ((!sz) && (!err)) {
888 advance_queue(tsock);
889 goto restart;
890 }
891
892 /* Capture sender's address (optional) */
893
894 set_orig_addr(m, msg);
895
896 /* Capture ancillary data (optional) */
897
898 if ((res = anc_data_recv(m, msg, tsock->p)))
899 goto exit;
900
901 /* Capture message data (if valid) & compute return value (always) */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900902
Per Lidenb97bf3f2006-01-02 19:04:38 +0100903 if (!err) {
904 if (unlikely(buf_len < sz)) {
905 sz = buf_len;
906 m->msg_flags |= MSG_TRUNC;
907 }
908 if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg),
909 sz))) {
910 res = -EFAULT;
911 goto exit;
912 }
913 res = sz;
914 } else {
915 if ((sock->state == SS_READY) ||
916 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
917 res = 0;
918 else
919 res = -ECONNRESET;
920 }
921
922 /* Consume received message (optional) */
923
924 if (likely(!(flags & MSG_PEEK))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900925 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
926 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
Per Lidenb97bf3f2006-01-02 19:04:38 +0100927 advance_queue(tsock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900928 }
Per Lidenb97bf3f2006-01-02 19:04:38 +0100929exit:
930 up(&tsock->sem);
931 return res;
932}
933
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900934/**
Per Lidenb97bf3f2006-01-02 19:04:38 +0100935 * recv_stream - receive stream-oriented data
936 * @iocb: (unused)
937 * @m: descriptor for message info
938 * @buf_len: total size of user buffer area
939 * @flags: receive flags
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900940 *
941 * Used for SOCK_STREAM messages only. If not enough data is available
Per Lidenb97bf3f2006-01-02 19:04:38 +0100942 * will optionally wait for more; never truncates data.
943 *
944 * Returns size of returned message data, errno otherwise
945 */
946
947static int recv_stream(struct kiocb *iocb, struct socket *sock,
948 struct msghdr *m, size_t buf_len, int flags)
949{
950 struct tipc_sock *tsock = tipc_sk(sock->sk);
951 struct sk_buff *buf;
952 struct tipc_msg *msg;
953 unsigned int q_len;
954 unsigned int sz;
955 int sz_to_copy;
956 int sz_copied = 0;
957 int needed;
Al Viro28c4dad2006-10-10 22:45:57 +0100958 char __user *crs = m->msg_iov->iov_base;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100959 unsigned char *buf_crs;
960 u32 err;
961 int res;
962
963 /* Currently doesn't support receiving into multiple iovec entries */
964
965 if (m->msg_iovlen != 1)
966 return -EOPNOTSUPP;
967
968 /* Catch invalid receive attempts */
969
970 if (unlikely(!buf_len))
971 return -EINVAL;
972
973 if (unlikely(sock->state == SS_DISCONNECTING)) {
974 if (skb_queue_len(&sock->sk->sk_receive_queue) == 0)
975 return -ENOTCONN;
976 } else if (unlikely(sock->state != SS_CONNECTED))
977 return -ENOTCONN;
978
979 /* Look for a message in receive queue; wait if necessary */
980
981 if (unlikely(down_interruptible(&tsock->sem)))
982 return -ERESTARTSYS;
983
984restart:
985 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
986 (flags & MSG_DONTWAIT))) {
Allan Stephensa3b0a5a2006-06-25 23:48:22 -0700987 res = -EWOULDBLOCK;
Per Lidenb97bf3f2006-01-02 19:04:38 +0100988 goto exit;
989 }
990
991 if ((res = wait_event_interruptible(
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +0900992 *sock->sk->sk_sleep,
Per Lidenb97bf3f2006-01-02 19:04:38 +0100993 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
994 (sock->state == SS_DISCONNECTING))) )) {
995 goto exit;
996 }
997
998 /* Catch attempt to receive on an already terminated connection */
999 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */
1000
1001 if (!q_len) {
1002 res = -ENOTCONN;
1003 goto exit;
1004 }
1005
1006 /* Get access to first message in receive queue */
1007
1008 buf = skb_peek(&sock->sk->sk_receive_queue);
1009 msg = buf_msg(buf);
1010 sz = msg_data_sz(msg);
1011 err = msg_errcode(msg);
1012
1013 /* Discard an empty non-errored message & try again */
1014
1015 if ((!sz) && (!err)) {
1016 advance_queue(tsock);
1017 goto restart;
1018 }
1019
1020 /* Optionally capture sender's address & ancillary data of first msg */
1021
1022 if (sz_copied == 0) {
1023 set_orig_addr(m, msg);
1024 if ((res = anc_data_recv(m, msg, tsock->p)))
1025 goto exit;
1026 }
1027
1028 /* Capture message data (if valid) & compute return value (always) */
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001029
Per Lidenb97bf3f2006-01-02 19:04:38 +01001030 if (!err) {
1031 buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -07001032 sz = skb_tail_pointer(buf) - buf_crs;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001033
1034 needed = (buf_len - sz_copied);
1035 sz_to_copy = (sz <= needed) ? sz : needed;
1036 if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) {
1037 res = -EFAULT;
1038 goto exit;
1039 }
1040 sz_copied += sz_to_copy;
1041
1042 if (sz_to_copy < sz) {
1043 if (!(flags & MSG_PEEK))
1044 TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy;
1045 goto exit;
1046 }
1047
1048 crs += sz_to_copy;
1049 } else {
1050 if (sz_copied != 0)
1051 goto exit; /* can't add error msg to valid data */
1052
1053 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1054 res = 0;
1055 else
1056 res = -ECONNRESET;
1057 }
1058
1059 /* Consume received message (optional) */
1060
1061 if (likely(!(flags & MSG_PEEK))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001062 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1063 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001064 advance_queue(tsock);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001065 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001066
1067 /* Loop around if more data is required */
1068
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001069 if ((sz_copied < buf_len) /* didn't get all requested data */
Per Lidenb97bf3f2006-01-02 19:04:38 +01001070 && (flags & MSG_WAITALL) /* ... and need to wait for more */
1071 && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */
1072 && (!err) /* ... and haven't reached a FIN */
1073 )
1074 goto restart;
1075
1076exit:
1077 up(&tsock->sem);
Allan Stephensa3b0a5a2006-06-25 23:48:22 -07001078 return sz_copied ? sz_copied : res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001079}
1080
1081/**
1082 * queue_overloaded - test if queue overload condition exists
1083 * @queue_size: current size of queue
1084 * @base: nominal maximum size of queue
1085 * @msg: message to be added to queue
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001086 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001087 * Returns 1 if queue is currently overloaded, 0 otherwise
1088 */
1089
1090static int queue_overloaded(u32 queue_size, u32 base, struct tipc_msg *msg)
1091{
1092 u32 threshold;
1093 u32 imp = msg_importance(msg);
1094
1095 if (imp == TIPC_LOW_IMPORTANCE)
1096 threshold = base;
1097 else if (imp == TIPC_MEDIUM_IMPORTANCE)
1098 threshold = base * 2;
1099 else if (imp == TIPC_HIGH_IMPORTANCE)
1100 threshold = base * 100;
1101 else
1102 return 0;
1103
1104 if (msg_connected(msg))
1105 threshold *= 4;
1106
1107 return (queue_size > threshold);
1108}
1109
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001110/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001111 * async_disconnect - wrapper function used to disconnect port
1112 * @portref: TIPC port reference (passed as pointer-sized value)
1113 */
1114
1115static void async_disconnect(unsigned long portref)
1116{
1117 tipc_disconnect((u32)portref);
1118}
1119
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001120/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001121 * dispatch - handle arriving message
1122 * @tport: TIPC port that received message
1123 * @buf: message
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001124 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001125 * Called with port locked. Must not take socket lock to avoid deadlock risk.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001126 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001127 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1128 */
1129
1130static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1131{
1132 struct tipc_msg *msg = buf_msg(buf);
1133 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle;
1134 struct socket *sock;
1135 u32 recv_q_len;
1136
1137 /* Reject message if socket is closing */
1138
1139 if (!tsock)
1140 return TIPC_ERR_NO_PORT;
1141
1142 /* Reject message if it is wrong sort of message for socket */
1143
1144 /*
1145 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
1146 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
1147 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
1148 */
1149 sock = tsock->sk.sk_socket;
1150 if (sock->state == SS_READY) {
1151 if (msg_connected(msg)) {
1152 msg_dbg(msg, "dispatch filter 1\n");
1153 return TIPC_ERR_NO_PORT;
1154 }
1155 } else {
1156 if (msg_mcast(msg)) {
1157 msg_dbg(msg, "dispatch filter 2\n");
1158 return TIPC_ERR_NO_PORT;
1159 }
1160 if (sock->state == SS_CONNECTED) {
1161 if (!msg_connected(msg)) {
1162 msg_dbg(msg, "dispatch filter 3\n");
1163 return TIPC_ERR_NO_PORT;
1164 }
1165 }
1166 else if (sock->state == SS_CONNECTING) {
1167 if (!msg_connected(msg) && (msg_errcode(msg) == 0)) {
1168 msg_dbg(msg, "dispatch filter 4\n");
1169 return TIPC_ERR_NO_PORT;
1170 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001171 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001172 else if (sock->state == SS_LISTENING) {
1173 if (msg_connected(msg) || msg_errcode(msg)) {
1174 msg_dbg(msg, "dispatch filter 5\n");
1175 return TIPC_ERR_NO_PORT;
1176 }
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001177 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001178 else if (sock->state == SS_DISCONNECTING) {
1179 msg_dbg(msg, "dispatch filter 6\n");
1180 return TIPC_ERR_NO_PORT;
1181 }
1182 else /* (sock->state == SS_UNCONNECTED) */ {
1183 if (msg_connected(msg) || msg_errcode(msg)) {
1184 msg_dbg(msg, "dispatch filter 7\n");
1185 return TIPC_ERR_NO_PORT;
1186 }
1187 }
1188 }
1189
1190 /* Reject message if there isn't room to queue it */
1191
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001192 if (unlikely((u32)atomic_read(&tipc_queue_size) >
Per Lidenb97bf3f2006-01-02 19:04:38 +01001193 OVERLOAD_LIMIT_BASE)) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001194 if (queue_overloaded(atomic_read(&tipc_queue_size),
Per Lidenb97bf3f2006-01-02 19:04:38 +01001195 OVERLOAD_LIMIT_BASE, msg))
1196 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001197 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001198 recv_q_len = skb_queue_len(&tsock->sk.sk_receive_queue);
1199 if (unlikely(recv_q_len > (OVERLOAD_LIMIT_BASE / 2))) {
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001200 if (queue_overloaded(recv_q_len,
1201 OVERLOAD_LIMIT_BASE / 2, msg))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001202 return TIPC_ERR_OVERLOAD;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001203 }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001204
1205 /* Initiate connection termination for an incoming 'FIN' */
1206
1207 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
1208 sock->state = SS_DISCONNECTING;
1209 /* Note: Use signal since port lock is already taken! */
Per Liden4323add2006-01-18 00:38:21 +01001210 tipc_k_signal((Handler)async_disconnect, tport->ref);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001211 }
1212
1213 /* Enqueue message (finally!) */
1214
1215 msg_dbg(msg,"<DISP<: ");
1216 TIPC_SKB_CB(buf)->handle = msg_data(msg);
1217 atomic_inc(&tipc_queue_size);
1218 skb_queue_tail(&sock->sk->sk_receive_queue, buf);
1219
Allan Stephenscfb0c082006-10-16 21:47:18 -07001220 if (waitqueue_active(sock->sk->sk_sleep))
1221 wake_up_interruptible(sock->sk->sk_sleep);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001222 return TIPC_OK;
1223}
1224
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001225/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001226 * wakeupdispatch - wake up port after congestion
1227 * @tport: port to wakeup
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001228 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001229 * Called with port lock on.
1230 */
1231
1232static void wakeupdispatch(struct tipc_port *tport)
1233{
1234 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle;
1235
Allan Stephenscfb0c082006-10-16 21:47:18 -07001236 if (waitqueue_active(tsock->sk.sk_sleep))
1237 wake_up_interruptible(tsock->sk.sk_sleep);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001238}
1239
1240/**
1241 * connect - establish a connection to another TIPC port
1242 * @sock: socket structure
1243 * @dest: socket address for destination port
1244 * @destlen: size of socket address data structure
1245 * @flags: (unused)
1246 *
1247 * Returns 0 on success, errno otherwise
1248 */
1249
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001250static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001251 int flags)
1252{
1253 struct tipc_sock *tsock = tipc_sk(sock->sk);
1254 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001255 struct msghdr m = {NULL,};
Per Lidenb97bf3f2006-01-02 19:04:38 +01001256 struct sk_buff *buf;
1257 struct tipc_msg *msg;
1258 int res;
1259
1260 /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */
1261
1262 if (sock->state == SS_READY)
1263 return -EOPNOTSUPP;
1264
Allan Stephens51f9cc12006-06-25 23:49:06 -07001265 /* Issue Posix-compliant error code if socket is in the wrong state */
1266
Per Lidenb97bf3f2006-01-02 19:04:38 +01001267 if (sock->state == SS_LISTENING)
1268 return -EOPNOTSUPP;
1269 if (sock->state == SS_CONNECTING)
1270 return -EALREADY;
1271 if (sock->state != SS_UNCONNECTED)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001272 return -EISCONN;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001273
Allan Stephens51f9cc12006-06-25 23:49:06 -07001274 /*
1275 * Reject connection attempt using multicast address
1276 *
1277 * Note: send_msg() validates the rest of the address fields,
1278 * so there's no need to do it here
1279 */
1280
1281 if (dst->addrtype == TIPC_ADDR_MCAST)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001282 return -EINVAL;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001283
1284 /* Send a 'SYN-' to destination */
1285
1286 m.msg_name = dest;
Allan Stephens51f9cc12006-06-25 23:49:06 -07001287 m.msg_namelen = destlen;
Sam Ravnborg1fc54d82006-03-20 22:36:47 -08001288 if ((res = send_msg(NULL, sock, &m, 0)) < 0) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001289 sock->state = SS_DISCONNECTING;
1290 return res;
1291 }
1292
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001293 if (down_interruptible(&tsock->sem))
1294 return -ERESTARTSYS;
1295
Per Lidenb97bf3f2006-01-02 19:04:38 +01001296 /* Wait for destination's 'ACK' response */
1297
1298 res = wait_event_interruptible_timeout(*sock->sk->sk_sleep,
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001299 skb_queue_len(&sock->sk->sk_receive_queue),
Per Lidenb97bf3f2006-01-02 19:04:38 +01001300 sock->sk->sk_rcvtimeo);
1301 buf = skb_peek(&sock->sk->sk_receive_queue);
1302 if (res > 0) {
1303 msg = buf_msg(buf);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001304 res = auto_connect(sock, tsock, msg);
1305 if (!res) {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001306 if (!msg_data_sz(msg))
1307 advance_queue(tsock);
1308 }
1309 } else {
1310 if (res == 0) {
1311 res = -ETIMEDOUT;
1312 } else
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001313 { /* leave "res" unchanged */ }
Per Lidenb97bf3f2006-01-02 19:04:38 +01001314 sock->state = SS_DISCONNECTING;
1315 }
1316
1317 up(&tsock->sem);
1318 return res;
1319}
1320
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001321/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001322 * listen - allow socket to listen for incoming connections
1323 * @sock: socket structure
1324 * @len: (unused)
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001325 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001326 * Returns 0 on success, errno otherwise
1327 */
1328
1329static int listen(struct socket *sock, int len)
1330{
1331 /* REQUIRES SOCKET LOCKING OF SOME SORT? */
1332
1333 if (sock->state == SS_READY)
1334 return -EOPNOTSUPP;
1335 if (sock->state != SS_UNCONNECTED)
1336 return -EINVAL;
1337 sock->state = SS_LISTENING;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001338 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001339}
1340
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001341/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001342 * accept - wait for connection request
1343 * @sock: listening socket
1344 * @newsock: new socket that is to be connected
1345 * @flags: file-related flags associated with socket
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001346 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001347 * Returns 0 on success, errno otherwise
1348 */
1349
1350static int accept(struct socket *sock, struct socket *newsock, int flags)
1351{
1352 struct tipc_sock *tsock = tipc_sk(sock->sk);
1353 struct sk_buff *buf;
1354 int res = -EFAULT;
1355
1356 if (sock->state == SS_READY)
1357 return -EOPNOTSUPP;
1358 if (sock->state != SS_LISTENING)
1359 return -EINVAL;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001360
1361 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
Per Lidenb97bf3f2006-01-02 19:04:38 +01001362 (flags & O_NONBLOCK)))
1363 return -EWOULDBLOCK;
1364
1365 if (down_interruptible(&tsock->sem))
1366 return -ERESTARTSYS;
1367
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001368 if (wait_event_interruptible(*sock->sk->sk_sleep,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001369 skb_queue_len(&sock->sk->sk_receive_queue))) {
1370 res = -ERESTARTSYS;
1371 goto exit;
1372 }
1373 buf = skb_peek(&sock->sk->sk_receive_queue);
1374
1375 res = tipc_create(newsock, 0);
1376 if (!res) {
1377 struct tipc_sock *new_tsock = tipc_sk(newsock->sk);
1378 struct tipc_portid id;
1379 struct tipc_msg *msg = buf_msg(buf);
1380 u32 new_ref = new_tsock->p->ref;
1381
1382 id.ref = msg_origport(msg);
1383 id.node = msg_orignode(msg);
1384 tipc_connect2port(new_ref, &id);
1385 newsock->state = SS_CONNECTED;
1386
1387 tipc_set_portimportance(new_ref, msg_importance(msg));
1388 if (msg_named(msg)) {
1389 new_tsock->p->conn_type = msg_nametype(msg);
1390 new_tsock->p->conn_instance = msg_nameinst(msg);
1391 }
1392
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001393 /*
Per Lidenb97bf3f2006-01-02 19:04:38 +01001394 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1395 * Respond to 'SYN+' by queuing it on new socket.
1396 */
1397
1398 msg_dbg(msg,"<ACC<: ");
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001399 if (!msg_data_sz(msg)) {
1400 struct msghdr m = {NULL,};
Per Lidenb97bf3f2006-01-02 19:04:38 +01001401
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001402 send_packet(NULL, newsock, &m, 0);
1403 advance_queue(tsock);
1404 } else {
Per Lidenb97bf3f2006-01-02 19:04:38 +01001405 sock_lock(tsock);
1406 skb_dequeue(&sock->sk->sk_receive_queue);
1407 sock_unlock(tsock);
1408 skb_queue_head(&newsock->sk->sk_receive_queue, buf);
1409 }
1410 }
1411exit:
1412 up(&tsock->sem);
1413 return res;
1414}
1415
1416/**
1417 * shutdown - shutdown socket connection
1418 * @sock: socket structure
Allan Stephense9024f0f2006-06-25 23:43:57 -07001419 * @how: direction to close (unused; always treated as read + write)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001420 *
1421 * Terminates connection (if necessary), then purges socket's receive queue.
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001422 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001423 * Returns 0 on success, errno otherwise
1424 */
1425
1426static int shutdown(struct socket *sock, int how)
1427{
1428 struct tipc_sock* tsock = tipc_sk(sock->sk);
1429 struct sk_buff *buf;
1430 int res;
1431
1432 /* Could return -EINVAL for an invalid "how", but why bother? */
1433
1434 if (down_interruptible(&tsock->sem))
1435 return -ERESTARTSYS;
1436
1437 sock_lock(tsock);
1438
1439 switch (sock->state) {
1440 case SS_CONNECTED:
1441
1442 /* Send 'FIN+' or 'FIN-' message to peer */
1443
1444 sock_unlock(tsock);
1445restart:
1446 if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
1447 atomic_dec(&tipc_queue_size);
1448 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) {
1449 buf_discard(buf);
1450 goto restart;
1451 }
1452 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1453 }
1454 else {
1455 tipc_shutdown(tsock->p->ref);
1456 }
1457 sock_lock(tsock);
1458
1459 /* fall through */
1460
1461 case SS_DISCONNECTING:
1462
1463 /* Discard any unreceived messages */
1464
1465 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
1466 atomic_dec(&tipc_queue_size);
1467 buf_discard(buf);
1468 }
1469 tsock->p->conn_unacked = 0;
1470
1471 /* fall through */
1472
1473 case SS_CONNECTING:
1474 sock->state = SS_DISCONNECTING;
1475 res = 0;
1476 break;
1477
1478 default:
1479 res = -ENOTCONN;
1480 }
1481
1482 sock_unlock(tsock);
1483
1484 up(&tsock->sem);
1485 return res;
1486}
1487
1488/**
1489 * setsockopt - set socket option
1490 * @sock: socket structure
1491 * @lvl: option level
1492 * @opt: option identifier
1493 * @ov: pointer to new option value
1494 * @ol: length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001495 *
1496 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001497 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001498 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001499 * Returns 0 on success, errno otherwise
1500 */
1501
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001502static int setsockopt(struct socket *sock,
Allan Stephense9024f0f2006-06-25 23:43:57 -07001503 int lvl, int opt, char __user *ov, int ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001504{
1505 struct tipc_sock *tsock = tipc_sk(sock->sk);
1506 u32 value;
1507 int res;
1508
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001509 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1510 return 0;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001511 if (lvl != SOL_TIPC)
1512 return -ENOPROTOOPT;
1513 if (ol < sizeof(value))
1514 return -EINVAL;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001515 if ((res = get_user(value, (u32 __user *)ov)))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001516 return res;
1517
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001518 if (down_interruptible(&tsock->sem))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001519 return -ERESTARTSYS;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001520
Per Lidenb97bf3f2006-01-02 19:04:38 +01001521 switch (opt) {
1522 case TIPC_IMPORTANCE:
1523 res = tipc_set_portimportance(tsock->p->ref, value);
1524 break;
1525 case TIPC_SRC_DROPPABLE:
1526 if (sock->type != SOCK_STREAM)
1527 res = tipc_set_portunreliable(tsock->p->ref, value);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001528 else
Per Lidenb97bf3f2006-01-02 19:04:38 +01001529 res = -ENOPROTOOPT;
1530 break;
1531 case TIPC_DEST_DROPPABLE:
1532 res = tipc_set_portunreturnable(tsock->p->ref, value);
1533 break;
1534 case TIPC_CONN_TIMEOUT:
1535 sock->sk->sk_rcvtimeo = (value * HZ / 1000);
1536 break;
1537 default:
1538 res = -EINVAL;
1539 }
1540
1541 up(&tsock->sem);
1542 return res;
1543}
1544
1545/**
1546 * getsockopt - get socket option
1547 * @sock: socket structure
1548 * @lvl: option level
1549 * @opt: option identifier
1550 * @ov: receptacle for option value
1551 * @ol: receptacle for length of option value
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001552 *
1553 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
Per Lidenb97bf3f2006-01-02 19:04:38 +01001554 * (to ease compatibility).
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001555 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001556 * Returns 0 on success, errno otherwise
1557 */
1558
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001559static int getsockopt(struct socket *sock,
Al Viro28c4dad2006-10-10 22:45:57 +01001560 int lvl, int opt, char __user *ov, int __user *ol)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001561{
1562 struct tipc_sock *tsock = tipc_sk(sock->sk);
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001563 int len;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001564 u32 value;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001565 int res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001566
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001567 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1568 return put_user(0, ol);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001569 if (lvl != SOL_TIPC)
1570 return -ENOPROTOOPT;
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001571 if ((res = get_user(len, ol)))
1572 return res;
Per Lidenb97bf3f2006-01-02 19:04:38 +01001573
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001574 if (down_interruptible(&tsock->sem))
Per Lidenb97bf3f2006-01-02 19:04:38 +01001575 return -ERESTARTSYS;
1576
1577 switch (opt) {
1578 case TIPC_IMPORTANCE:
1579 res = tipc_portimportance(tsock->p->ref, &value);
1580 break;
1581 case TIPC_SRC_DROPPABLE:
1582 res = tipc_portunreliable(tsock->p->ref, &value);
1583 break;
1584 case TIPC_DEST_DROPPABLE:
1585 res = tipc_portunreturnable(tsock->p->ref, &value);
1586 break;
1587 case TIPC_CONN_TIMEOUT:
1588 value = (sock->sk->sk_rcvtimeo * 1000) / HZ;
1589 break;
1590 default:
1591 res = -EINVAL;
1592 }
1593
1594 if (res) {
1595 /* "get" failed */
1596 }
1597 else if (len < sizeof(value)) {
1598 res = -EINVAL;
1599 }
1600 else if ((res = copy_to_user(ov, &value, sizeof(value)))) {
1601 /* couldn't return value */
1602 }
1603 else {
1604 res = put_user(sizeof(value), ol);
1605 }
1606
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001607 up(&tsock->sem);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001608 return res;
1609}
1610
1611/**
Per Lidenb97bf3f2006-01-02 19:04:38 +01001612 * Protocol switches for the various types of TIPC sockets
1613 */
1614
1615static struct proto_ops msg_ops = {
1616 .owner = THIS_MODULE,
1617 .family = AF_TIPC,
1618 .release = release,
1619 .bind = bind,
1620 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001621 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001622 .accept = accept,
1623 .getname = get_name,
1624 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001625 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001626 .listen = listen,
1627 .shutdown = shutdown,
1628 .setsockopt = setsockopt,
1629 .getsockopt = getsockopt,
1630 .sendmsg = send_msg,
1631 .recvmsg = recv_msg,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001632 .mmap = sock_no_mmap,
1633 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001634};
1635
1636static struct proto_ops packet_ops = {
1637 .owner = THIS_MODULE,
1638 .family = AF_TIPC,
1639 .release = release,
1640 .bind = bind,
1641 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001642 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001643 .accept = accept,
1644 .getname = get_name,
1645 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001646 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001647 .listen = listen,
1648 .shutdown = shutdown,
1649 .setsockopt = setsockopt,
1650 .getsockopt = getsockopt,
1651 .sendmsg = send_packet,
1652 .recvmsg = recv_msg,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001653 .mmap = sock_no_mmap,
1654 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001655};
1656
1657static struct proto_ops stream_ops = {
1658 .owner = THIS_MODULE,
1659 .family = AF_TIPC,
1660 .release = release,
1661 .bind = bind,
1662 .connect = connect,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001663 .socketpair = sock_no_socketpair,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001664 .accept = accept,
1665 .getname = get_name,
1666 .poll = poll,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001667 .ioctl = sock_no_ioctl,
Per Lidenb97bf3f2006-01-02 19:04:38 +01001668 .listen = listen,
1669 .shutdown = shutdown,
1670 .setsockopt = setsockopt,
1671 .getsockopt = getsockopt,
1672 .sendmsg = send_stream,
1673 .recvmsg = recv_stream,
Allan Stephens5eee6a62007-06-10 17:24:55 -07001674 .mmap = sock_no_mmap,
1675 .sendpage = sock_no_sendpage
Per Lidenb97bf3f2006-01-02 19:04:38 +01001676};
1677
1678static struct net_proto_family tipc_family_ops = {
1679 .owner = THIS_MODULE,
1680 .family = AF_TIPC,
1681 .create = tipc_create
1682};
1683
1684static struct proto tipc_proto = {
1685 .name = "TIPC",
1686 .owner = THIS_MODULE,
1687 .obj_size = sizeof(struct tipc_sock)
1688};
1689
1690/**
Per Liden4323add2006-01-18 00:38:21 +01001691 * tipc_socket_init - initialize TIPC socket interface
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001692 *
Per Lidenb97bf3f2006-01-02 19:04:38 +01001693 * Returns 0 on success, errno otherwise
1694 */
Per Liden4323add2006-01-18 00:38:21 +01001695int tipc_socket_init(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001696{
1697 int res;
1698
YOSHIFUJI Hideakic4307282007-02-09 23:25:21 +09001699 res = proto_register(&tipc_proto, 1);
Per Lidenb97bf3f2006-01-02 19:04:38 +01001700 if (res) {
Per Lidend0a14a92006-01-11 13:52:51 +01001701 err("Failed to register TIPC protocol type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001702 goto out;
1703 }
1704
1705 res = sock_register(&tipc_family_ops);
1706 if (res) {
Per Lidend0a14a92006-01-11 13:52:51 +01001707 err("Failed to register TIPC socket type\n");
Per Lidenb97bf3f2006-01-02 19:04:38 +01001708 proto_unregister(&tipc_proto);
1709 goto out;
1710 }
1711
1712 sockets_enabled = 1;
1713 out:
1714 return res;
1715}
1716
1717/**
Per Liden4323add2006-01-18 00:38:21 +01001718 * tipc_socket_stop - stop TIPC socket interface
Per Lidenb97bf3f2006-01-02 19:04:38 +01001719 */
Per Liden4323add2006-01-18 00:38:21 +01001720void tipc_socket_stop(void)
Per Lidenb97bf3f2006-01-02 19:04:38 +01001721{
1722 if (!sockets_enabled)
1723 return;
1724
1725 sockets_enabled = 0;
1726 sock_unregister(tipc_family_ops.family);
1727 proto_unregister(&tipc_proto);
1728}
1729