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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/socket.c: TIPC socket API | |
c4307285 | 3 | * |
5eee6a6d AS |
4 | * Copyright (c) 2001-2007, Ericsson AB |
5 | * Copyright (c) 2004-2007, Wind River Systems | |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
11 | * 1. Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. Neither the names of the copyright holders nor the names of its | |
17 | * contributors may be used to endorse or promote products derived from | |
18 | * this software without specific prior written permission. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
20 | * Alternatively, this software may be distributed under the terms of the |
21 | * GNU General Public License ("GPL") version 2 as published by the Free | |
22 | * Software Foundation. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | |
25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE | |
28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | |
31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN | |
32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) | |
33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
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> | |
b97bf3fd | 45 | #include <linux/fcntl.h> |
b97bf3fd PL |
46 | #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> | |
ea714ccd | 52 | #include <linux/tipc_config.h> |
b97bf3fd PL |
53 | #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 | ||
63 | struct 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 | ||
71 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf); | |
72 | static void wakeupdispatch(struct tipc_port *tport); | |
73 | ||
74 | static struct proto_ops packet_ops; | |
75 | static struct proto_ops stream_ops; | |
76 | static struct proto_ops msg_ops; | |
77 | ||
78 | static struct proto tipc_proto; | |
79 | ||
80 | static int sockets_enabled = 0; | |
81 | ||
82 | static atomic_t tipc_queue_size = ATOMIC_INIT(0); | |
83 | ||
84 | ||
c4307285 YH |
85 | /* |
86 | * sock_lock(): Lock a port/socket pair. lock_sock() can | |
87 | * not be used here, since the same lock must protect ports | |
b97bf3fd PL |
88 | * with non-socket interfaces. |
89 | * See net.c for description of locking policy. | |
90 | */ | |
05790c64 | 91 | static void sock_lock(struct tipc_sock* tsock) |
b97bf3fd | 92 | { |
c4307285 | 93 | spin_lock_bh(tsock->p->lock); |
b97bf3fd PL |
94 | } |
95 | ||
c4307285 | 96 | /* |
b97bf3fd PL |
97 | * sock_unlock(): Unlock a port/socket pair |
98 | */ | |
05790c64 | 99 | static void sock_unlock(struct tipc_sock* tsock) |
b97bf3fd | 100 | { |
c4307285 | 101 | spin_unlock_bh(tsock->p->lock); |
b97bf3fd PL |
102 | } |
103 | ||
104 | /** | |
105 | * pollmask - determine the current set of poll() events for a socket | |
106 | * @sock: socket structure | |
c4307285 | 107 | * |
b97bf3fd PL |
108 | * 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! | |
c4307285 | 118 | * |
b97bf3fd PL |
119 | * Returns pollmask value |
120 | */ | |
121 | ||
05790c64 | 122 | static u32 pollmask(struct socket *sock) |
b97bf3fd PL |
123 | { |
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 | ||
c4307285 | 133 | if (sock->state == SS_DISCONNECTING) |
b97bf3fd PL |
134 | 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 | ||
05790c64 | 147 | static void advance_queue(struct tipc_sock *tsock) |
b97bf3fd | 148 | { |
c4307285 | 149 | sock_lock(tsock); |
b97bf3fd | 150 | buf_discard(skb_dequeue(&tsock->sk.sk_receive_queue)); |
c4307285 | 151 | sock_unlock(tsock); |
b97bf3fd PL |
152 | 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) | |
c4307285 | 159 | * |
b97bf3fd PL |
160 | * 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 | */ | |
165 | static int tipc_create(struct socket *sock, int protocol) | |
166 | { | |
167 | struct tipc_sock *tsock; | |
168 | struct tipc_port *port; | |
169 | struct sock *sk; | |
c4307285 | 170 | u32 ref; |
b97bf3fd | 171 | |
b97bf3fd PL |
172 | if (unlikely(protocol != 0)) |
173 | return -EPROTONOSUPPORT; | |
174 | ||
1fc54d8f | 175 | ref = tipc_createport_raw(NULL, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE); |
b97bf3fd PL |
176 | 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; | |
49978651 AS |
196 | default: |
197 | tipc_deleteport(ref); | |
198 | return -EPROTOTYPE; | |
b97bf3fd PL |
199 | } |
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.) | |
c4307285 | 235 | * |
b97bf3fd PL |
236 | * 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 | ||
243 | static 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 | ||
c4307285 | 250 | dbg("sock_delete: %x\n",tsock); |
b97bf3fd PL |
251 | if (!tsock) |
252 | return 0; | |
253 | down_interruptible(&tsock->sem); | |
254 | if (!sock->sk) { | |
255 | up(&tsock->sem); | |
256 | return 0; | |
257 | } | |
c4307285 | 258 | |
b97bf3fd PL |
259 | /* 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) | |
1fc54d8f | 265 | tsock->p->usr_handle = NULL; |
b97bf3fd PL |
266 | 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 | ||
c4307285 | 292 | atomic_dec(&tipc_user_count); |
b97bf3fd PL |
293 | 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 | |
c4307285 | 301 | * |
b97bf3fd PL |
302 | * 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. | |
c4307285 | 305 | * |
b97bf3fd PL |
306 | * Returns 0 on success, errno otherwise |
307 | */ | |
308 | ||
309 | static 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; | |
c4307285 | 317 | |
b97bf3fd | 318 | if (unlikely(!uaddr_len)) { |
1fc54d8f | 319 | res = tipc_withdraw(tsock->p->ref, 0, NULL); |
b97bf3fd PL |
320 | 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 | } | |
c4307285 YH |
338 | |
339 | if (addr->scope > 0) | |
b97bf3fd PL |
340 | 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); | |
345 | exit: | |
346 | up(&tsock->sem); | |
347 | return res; | |
348 | } | |
349 | ||
c4307285 | 350 | /** |
b97bf3fd PL |
351 | * 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 | |
c4307285 | 356 | * |
b97bf3fd PL |
357 | * Returns 0 on success, errno otherwise |
358 | */ | |
359 | ||
c4307285 | 360 | static int get_name(struct socket *sock, struct sockaddr *uaddr, |
b97bf3fd PL |
361 | 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 | ||
c4307285 | 393 | static unsigned int poll(struct file *file, struct socket *sock, |
b97bf3fd PL |
394 | poll_table *wait) |
395 | { | |
396 | poll_wait(file, sock->sk->sk_sleep, wait); | |
397 | /* NEED LOCK HERE? */ | |
398 | return pollmask(sock); | |
399 | } | |
400 | ||
c4307285 | 401 | /** |
b97bf3fd PL |
402 | * 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 | |
c4307285 | 405 | * |
b97bf3fd PL |
406 | * Prevents restricted configuration commands from being issued by |
407 | * unauthorized users. | |
c4307285 | 408 | * |
b97bf3fd PL |
409 | * Returns 0 if permission is granted, otherwise errno |
410 | */ | |
411 | ||
05790c64 | 412 | static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m) |
b97bf3fd PL |
413 | { |
414 | struct tipc_cfg_msg_hdr hdr; | |
415 | ||
c4307285 YH |
416 | 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; | |
b97bf3fd | 420 | |
c4307285 YH |
421 | if (likely(dest->addr.name.name.type != TIPC_CFG_SRV)) |
422 | return -EACCES; | |
b97bf3fd | 423 | |
c4307285 | 424 | if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr))) |
b97bf3fd | 425 | return -EFAULT; |
70cb2347 | 426 | if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN))) |
b97bf3fd | 427 | return -EACCES; |
c4307285 | 428 | |
b97bf3fd PL |
429 | 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 | |
e9024f0f | 437 | * @total_len: length of message |
c4307285 | 438 | * |
b97bf3fd | 439 | * Message must have an destination specified explicitly. |
c4307285 | 440 | * Used for SOCK_RDM and SOCK_DGRAM messages, |
b97bf3fd PL |
441 | * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections. |
442 | * (Note: 'SYN+' is prohibited on SOCK_STREAM.) | |
c4307285 | 443 | * |
b97bf3fd PL |
444 | * Returns the number of bytes sent on success, or errno otherwise |
445 | */ | |
446 | ||
447 | static 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); | |
c4307285 | 451 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd PL |
452 | struct sk_buff *buf; |
453 | int needs_conn; | |
454 | int res = -EINVAL; | |
455 | ||
456 | if (unlikely(!dest)) | |
457 | return -EDESTADDRREQ; | |
51f9cc1f AS |
458 | if (unlikely((m->msg_namelen < sizeof(*dest)) || |
459 | (dest->family != AF_TIPC))) | |
b97bf3fd PL |
460 | 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; | |
3388007b AS |
471 | 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 | } | |
b97bf3fd PL |
475 | } |
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 | ||
c4307285 YH |
492 | 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) { | |
b97bf3fd PL |
509 | if (needs_conn) { |
510 | res = -EOPNOTSUPP; | |
511 | goto exit; | |
512 | } | |
c4307285 YH |
513 | 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)) { | |
522 | exit: | |
523 | up(&tsock->sem); | |
524 | return res; | |
525 | } | |
b97bf3fd PL |
526 | if (m->msg_flags & MSG_DONTWAIT) { |
527 | res = -EWOULDBLOCK; | |
528 | goto exit; | |
529 | } | |
c4307285 YH |
530 | if (wait_event_interruptible(*sock->sk->sk_sleep, |
531 | !tsock->p->congested)) { | |
532 | res = -ERESTARTSYS; | |
533 | goto exit; | |
534 | } | |
535 | } while (1); | |
b97bf3fd PL |
536 | } |
537 | ||
c4307285 | 538 | /** |
b97bf3fd PL |
539 | * send_packet - send a connection-oriented message |
540 | * @iocb: (unused) | |
541 | * @sock: socket structure | |
542 | * @m: message to send | |
e9024f0f | 543 | * @total_len: length of message |
c4307285 | 544 | * |
b97bf3fd | 545 | * Used for SOCK_SEQPACKET messages and SOCK_STREAM data. |
c4307285 | 546 | * |
b97bf3fd PL |
547 | * Returns the number of bytes sent on success, or errno otherwise |
548 | */ | |
549 | ||
550 | static 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); | |
c4307285 | 554 | struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd PL |
555 | 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; | |
c4307285 | 564 | } |
b97bf3fd | 565 | |
c4307285 | 566 | do { |
bdd94789 AS |
567 | if (unlikely(sock->state != SS_CONNECTED)) { |
568 | if (sock->state == SS_DISCONNECTING) | |
c4307285 | 569 | res = -EPIPE; |
bdd94789 AS |
570 | else |
571 | res = -ENOTCONN; | |
572 | goto exit; | |
573 | } | |
574 | ||
c4307285 YH |
575 | res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov); |
576 | if (likely(res != -ELINKCONG)) { | |
b97bf3fd | 577 | exit: |
c4307285 YH |
578 | up(&tsock->sem); |
579 | return res; | |
580 | } | |
b97bf3fd PL |
581 | if (m->msg_flags & MSG_DONTWAIT) { |
582 | res = -EWOULDBLOCK; | |
583 | goto exit; | |
584 | } | |
c4307285 YH |
585 | if (wait_event_interruptible(*sock->sk->sk_sleep, |
586 | !tsock->p->congested)) { | |
587 | res = -ERESTARTSYS; | |
588 | goto exit; | |
589 | } | |
590 | } while (1); | |
b97bf3fd PL |
591 | } |
592 | ||
c4307285 | 593 | /** |
b97bf3fd PL |
594 | * 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 | |
c4307285 | 599 | * |
b97bf3fd | 600 | * Used for SOCK_STREAM data. |
c4307285 YH |
601 | * |
602 | * Returns the number of bytes sent on success (or partial success), | |
1303e8f1 | 603 | * or errno if no data sent |
b97bf3fd PL |
604 | */ |
605 | ||
606 | ||
607 | static int send_stream(struct kiocb *iocb, struct socket *sock, | |
608 | struct msghdr *m, size_t total_len) | |
609 | { | |
610 | struct msghdr my_msg; | |
611 | struct iovec my_iov; | |
612 | struct iovec *curr_iov; | |
613 | int curr_iovlen; | |
614 | char __user *curr_start; | |
615 | int curr_left; | |
616 | int bytes_to_send; | |
1303e8f1 | 617 | int bytes_sent; |
b97bf3fd | 618 | int res; |
c4307285 | 619 | |
b97bf3fd PL |
620 | if (likely(total_len <= TIPC_MAX_USER_MSG_SIZE)) |
621 | return send_packet(iocb, sock, m, total_len); | |
622 | ||
623 | /* Can only send large data streams if already connected */ | |
624 | ||
c4307285 YH |
625 | if (unlikely(sock->state != SS_CONNECTED)) { |
626 | if (sock->state == SS_DISCONNECTING) | |
627 | return -EPIPE; | |
628 | else | |
629 | return -ENOTCONN; | |
630 | } | |
b97bf3fd | 631 | |
eb5959c2 AS |
632 | if (unlikely(m->msg_name)) |
633 | return -EISCONN; | |
634 | ||
c4307285 | 635 | /* |
b97bf3fd PL |
636 | * Send each iovec entry using one or more messages |
637 | * | |
c4307285 | 638 | * Note: This algorithm is good for the most likely case |
b97bf3fd PL |
639 | * (i.e. one large iovec entry), but could be improved to pass sets |
640 | * of small iovec entries into send_packet(). | |
641 | */ | |
642 | ||
1303e8f1 AS |
643 | curr_iov = m->msg_iov; |
644 | curr_iovlen = m->msg_iovlen; | |
b97bf3fd PL |
645 | my_msg.msg_iov = &my_iov; |
646 | my_msg.msg_iovlen = 1; | |
eb5959c2 AS |
647 | my_msg.msg_flags = m->msg_flags; |
648 | my_msg.msg_name = NULL; | |
1303e8f1 | 649 | bytes_sent = 0; |
b97bf3fd PL |
650 | |
651 | while (curr_iovlen--) { | |
652 | curr_start = curr_iov->iov_base; | |
653 | curr_left = curr_iov->iov_len; | |
654 | ||
655 | while (curr_left) { | |
656 | bytes_to_send = (curr_left < TIPC_MAX_USER_MSG_SIZE) | |
657 | ? curr_left : TIPC_MAX_USER_MSG_SIZE; | |
658 | my_iov.iov_base = curr_start; | |
659 | my_iov.iov_len = bytes_to_send; | |
c4307285 | 660 | if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0) { |
1303e8f1 AS |
661 | return bytes_sent ? bytes_sent : res; |
662 | } | |
b97bf3fd PL |
663 | curr_left -= bytes_to_send; |
664 | curr_start += bytes_to_send; | |
1303e8f1 | 665 | bytes_sent += bytes_to_send; |
b97bf3fd PL |
666 | } |
667 | ||
668 | curr_iov++; | |
669 | } | |
670 | ||
1303e8f1 | 671 | return bytes_sent; |
b97bf3fd PL |
672 | } |
673 | ||
674 | /** | |
675 | * auto_connect - complete connection setup to a remote port | |
676 | * @sock: socket structure | |
677 | * @tsock: TIPC-specific socket structure | |
678 | * @msg: peer's response message | |
c4307285 | 679 | * |
b97bf3fd PL |
680 | * Returns 0 on success, errno otherwise |
681 | */ | |
682 | ||
c4307285 | 683 | static int auto_connect(struct socket *sock, struct tipc_sock *tsock, |
b97bf3fd PL |
684 | struct tipc_msg *msg) |
685 | { | |
686 | struct tipc_portid peer; | |
687 | ||
688 | if (msg_errcode(msg)) { | |
689 | sock->state = SS_DISCONNECTING; | |
690 | return -ECONNREFUSED; | |
691 | } | |
692 | ||
693 | peer.ref = msg_origport(msg); | |
694 | peer.node = msg_orignode(msg); | |
695 | tipc_connect2port(tsock->p->ref, &peer); | |
696 | tipc_set_portimportance(tsock->p->ref, msg_importance(msg)); | |
697 | sock->state = SS_CONNECTED; | |
698 | return 0; | |
699 | } | |
700 | ||
701 | /** | |
702 | * set_orig_addr - capture sender's address for received message | |
703 | * @m: descriptor for message info | |
704 | * @msg: received message header | |
c4307285 | 705 | * |
b97bf3fd PL |
706 | * Note: Address is not captured if not requested by receiver. |
707 | */ | |
708 | ||
05790c64 | 709 | static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg) |
b97bf3fd | 710 | { |
c4307285 | 711 | struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name; |
b97bf3fd | 712 | |
c4307285 | 713 | if (addr) { |
b97bf3fd PL |
714 | addr->family = AF_TIPC; |
715 | addr->addrtype = TIPC_ADDR_ID; | |
716 | addr->addr.id.ref = msg_origport(msg); | |
717 | addr->addr.id.node = msg_orignode(msg); | |
718 | addr->addr.name.domain = 0; /* could leave uninitialized */ | |
719 | addr->scope = 0; /* could leave uninitialized */ | |
720 | m->msg_namelen = sizeof(struct sockaddr_tipc); | |
721 | } | |
722 | } | |
723 | ||
724 | /** | |
c4307285 | 725 | * anc_data_recv - optionally capture ancillary data for received message |
b97bf3fd PL |
726 | * @m: descriptor for message info |
727 | * @msg: received message header | |
728 | * @tport: TIPC port associated with message | |
c4307285 | 729 | * |
b97bf3fd | 730 | * Note: Ancillary data is not captured if not requested by receiver. |
c4307285 | 731 | * |
b97bf3fd PL |
732 | * Returns 0 if successful, otherwise errno |
733 | */ | |
734 | ||
05790c64 | 735 | static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg, |
b97bf3fd PL |
736 | struct tipc_port *tport) |
737 | { | |
738 | u32 anc_data[3]; | |
739 | u32 err; | |
740 | u32 dest_type; | |
3546c750 | 741 | int has_name; |
b97bf3fd PL |
742 | int res; |
743 | ||
744 | if (likely(m->msg_controllen == 0)) | |
745 | return 0; | |
746 | ||
747 | /* Optionally capture errored message object(s) */ | |
748 | ||
749 | err = msg ? msg_errcode(msg) : 0; | |
750 | if (unlikely(err)) { | |
751 | anc_data[0] = err; | |
752 | anc_data[1] = msg_data_sz(msg); | |
4b087b28 | 753 | if ((res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data))) |
b97bf3fd PL |
754 | return res; |
755 | if (anc_data[1] && | |
c4307285 | 756 | (res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1], |
b97bf3fd PL |
757 | msg_data(msg)))) |
758 | return res; | |
759 | } | |
760 | ||
761 | /* Optionally capture message destination object */ | |
762 | ||
763 | dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG; | |
764 | switch (dest_type) { | |
765 | case TIPC_NAMED_MSG: | |
3546c750 | 766 | has_name = 1; |
b97bf3fd PL |
767 | anc_data[0] = msg_nametype(msg); |
768 | anc_data[1] = msg_namelower(msg); | |
769 | anc_data[2] = msg_namelower(msg); | |
770 | break; | |
771 | case TIPC_MCAST_MSG: | |
3546c750 | 772 | has_name = 1; |
b97bf3fd PL |
773 | anc_data[0] = msg_nametype(msg); |
774 | anc_data[1] = msg_namelower(msg); | |
775 | anc_data[2] = msg_nameupper(msg); | |
776 | break; | |
777 | case TIPC_CONN_MSG: | |
3546c750 | 778 | has_name = (tport->conn_type != 0); |
b97bf3fd PL |
779 | anc_data[0] = tport->conn_type; |
780 | anc_data[1] = tport->conn_instance; | |
781 | anc_data[2] = tport->conn_instance; | |
782 | break; | |
783 | default: | |
3546c750 | 784 | has_name = 0; |
b97bf3fd | 785 | } |
3546c750 | 786 | if (has_name && |
4b087b28 | 787 | (res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data))) |
b97bf3fd PL |
788 | return res; |
789 | ||
790 | return 0; | |
791 | } | |
792 | ||
c4307285 | 793 | /** |
b97bf3fd PL |
794 | * recv_msg - receive packet-oriented message |
795 | * @iocb: (unused) | |
796 | * @m: descriptor for message info | |
797 | * @buf_len: total size of user buffer area | |
798 | * @flags: receive flags | |
c4307285 | 799 | * |
b97bf3fd PL |
800 | * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages. |
801 | * If the complete message doesn't fit in user area, truncate it. | |
802 | * | |
803 | * Returns size of returned message data, errno otherwise | |
804 | */ | |
805 | ||
806 | static int recv_msg(struct kiocb *iocb, struct socket *sock, | |
807 | struct msghdr *m, size_t buf_len, int flags) | |
808 | { | |
809 | struct tipc_sock *tsock = tipc_sk(sock->sk); | |
810 | struct sk_buff *buf; | |
811 | struct tipc_msg *msg; | |
812 | unsigned int q_len; | |
813 | unsigned int sz; | |
814 | u32 err; | |
815 | int res; | |
816 | ||
817 | /* Currently doesn't support receiving into multiple iovec entries */ | |
818 | ||
819 | if (m->msg_iovlen != 1) | |
820 | return -EOPNOTSUPP; | |
821 | ||
822 | /* Catch invalid receive attempts */ | |
823 | ||
824 | if (unlikely(!buf_len)) | |
825 | return -EINVAL; | |
826 | ||
827 | if (sock->type == SOCK_SEQPACKET) { | |
828 | if (unlikely(sock->state == SS_UNCONNECTED)) | |
829 | return -ENOTCONN; | |
c4307285 | 830 | if (unlikely((sock->state == SS_DISCONNECTING) && |
b97bf3fd | 831 | (skb_queue_len(&sock->sk->sk_receive_queue) == 0))) |
c4307285 | 832 | return -ENOTCONN; |
b97bf3fd PL |
833 | } |
834 | ||
835 | /* Look for a message in receive queue; wait if necessary */ | |
836 | ||
837 | if (unlikely(down_interruptible(&tsock->sem))) | |
838 | return -ERESTARTSYS; | |
839 | ||
840 | restart: | |
841 | if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && | |
842 | (flags & MSG_DONTWAIT))) { | |
843 | res = -EWOULDBLOCK; | |
844 | goto exit; | |
845 | } | |
846 | ||
847 | if ((res = wait_event_interruptible( | |
c4307285 | 848 | *sock->sk->sk_sleep, |
b97bf3fd PL |
849 | ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) || |
850 | (sock->state == SS_DISCONNECTING))) )) { | |
851 | goto exit; | |
852 | } | |
853 | ||
854 | /* Catch attempt to receive on an already terminated connection */ | |
855 | /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */ | |
856 | ||
857 | if (!q_len) { | |
858 | res = -ENOTCONN; | |
859 | goto exit; | |
860 | } | |
861 | ||
862 | /* Get access to first message in receive queue */ | |
863 | ||
864 | buf = skb_peek(&sock->sk->sk_receive_queue); | |
865 | msg = buf_msg(buf); | |
866 | sz = msg_data_sz(msg); | |
867 | err = msg_errcode(msg); | |
868 | ||
869 | /* Complete connection setup for an implied connect */ | |
870 | ||
871 | if (unlikely(sock->state == SS_CONNECTING)) { | |
872 | if ((res = auto_connect(sock, tsock, msg))) | |
873 | goto exit; | |
874 | } | |
875 | ||
876 | /* Discard an empty non-errored message & try again */ | |
877 | ||
878 | if ((!sz) && (!err)) { | |
879 | advance_queue(tsock); | |
880 | goto restart; | |
881 | } | |
882 | ||
883 | /* Capture sender's address (optional) */ | |
884 | ||
885 | set_orig_addr(m, msg); | |
886 | ||
887 | /* Capture ancillary data (optional) */ | |
888 | ||
889 | if ((res = anc_data_recv(m, msg, tsock->p))) | |
890 | goto exit; | |
891 | ||
892 | /* Capture message data (if valid) & compute return value (always) */ | |
c4307285 | 893 | |
b97bf3fd PL |
894 | if (!err) { |
895 | if (unlikely(buf_len < sz)) { | |
896 | sz = buf_len; | |
897 | m->msg_flags |= MSG_TRUNC; | |
898 | } | |
899 | if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg), | |
900 | sz))) { | |
901 | res = -EFAULT; | |
902 | goto exit; | |
903 | } | |
904 | res = sz; | |
905 | } else { | |
906 | if ((sock->state == SS_READY) || | |
907 | ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)) | |
908 | res = 0; | |
909 | else | |
910 | res = -ECONNRESET; | |
911 | } | |
912 | ||
913 | /* Consume received message (optional) */ | |
914 | ||
915 | if (likely(!(flags & MSG_PEEK))) { | |
c4307285 YH |
916 | if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
917 | tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked); | |
b97bf3fd | 918 | advance_queue(tsock); |
c4307285 | 919 | } |
b97bf3fd PL |
920 | exit: |
921 | up(&tsock->sem); | |
922 | return res; | |
923 | } | |
924 | ||
c4307285 | 925 | /** |
b97bf3fd PL |
926 | * recv_stream - receive stream-oriented data |
927 | * @iocb: (unused) | |
928 | * @m: descriptor for message info | |
929 | * @buf_len: total size of user buffer area | |
930 | * @flags: receive flags | |
c4307285 YH |
931 | * |
932 | * Used for SOCK_STREAM messages only. If not enough data is available | |
b97bf3fd PL |
933 | * will optionally wait for more; never truncates data. |
934 | * | |
935 | * Returns size of returned message data, errno otherwise | |
936 | */ | |
937 | ||
938 | static int recv_stream(struct kiocb *iocb, struct socket *sock, | |
939 | struct msghdr *m, size_t buf_len, int flags) | |
940 | { | |
941 | struct tipc_sock *tsock = tipc_sk(sock->sk); | |
942 | struct sk_buff *buf; | |
943 | struct tipc_msg *msg; | |
944 | unsigned int q_len; | |
945 | unsigned int sz; | |
946 | int sz_to_copy; | |
947 | int sz_copied = 0; | |
948 | int needed; | |
28c4dadd | 949 | char __user *crs = m->msg_iov->iov_base; |
b97bf3fd PL |
950 | unsigned char *buf_crs; |
951 | u32 err; | |
952 | int res; | |
953 | ||
954 | /* Currently doesn't support receiving into multiple iovec entries */ | |
955 | ||
956 | if (m->msg_iovlen != 1) | |
957 | return -EOPNOTSUPP; | |
958 | ||
959 | /* Catch invalid receive attempts */ | |
960 | ||
961 | if (unlikely(!buf_len)) | |
962 | return -EINVAL; | |
963 | ||
964 | if (unlikely(sock->state == SS_DISCONNECTING)) { | |
965 | if (skb_queue_len(&sock->sk->sk_receive_queue) == 0) | |
966 | return -ENOTCONN; | |
967 | } else if (unlikely(sock->state != SS_CONNECTED)) | |
968 | return -ENOTCONN; | |
969 | ||
970 | /* Look for a message in receive queue; wait if necessary */ | |
971 | ||
972 | if (unlikely(down_interruptible(&tsock->sem))) | |
973 | return -ERESTARTSYS; | |
974 | ||
975 | restart: | |
976 | if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && | |
977 | (flags & MSG_DONTWAIT))) { | |
a3b0a5a9 | 978 | res = -EWOULDBLOCK; |
b97bf3fd PL |
979 | goto exit; |
980 | } | |
981 | ||
982 | if ((res = wait_event_interruptible( | |
c4307285 | 983 | *sock->sk->sk_sleep, |
b97bf3fd PL |
984 | ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) || |
985 | (sock->state == SS_DISCONNECTING))) )) { | |
986 | goto exit; | |
987 | } | |
988 | ||
989 | /* Catch attempt to receive on an already terminated connection */ | |
990 | /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */ | |
991 | ||
992 | if (!q_len) { | |
993 | res = -ENOTCONN; | |
994 | goto exit; | |
995 | } | |
996 | ||
997 | /* Get access to first message in receive queue */ | |
998 | ||
999 | buf = skb_peek(&sock->sk->sk_receive_queue); | |
1000 | msg = buf_msg(buf); | |
1001 | sz = msg_data_sz(msg); | |
1002 | err = msg_errcode(msg); | |
1003 | ||
1004 | /* Discard an empty non-errored message & try again */ | |
1005 | ||
1006 | if ((!sz) && (!err)) { | |
1007 | advance_queue(tsock); | |
1008 | goto restart; | |
1009 | } | |
1010 | ||
1011 | /* Optionally capture sender's address & ancillary data of first msg */ | |
1012 | ||
1013 | if (sz_copied == 0) { | |
1014 | set_orig_addr(m, msg); | |
1015 | if ((res = anc_data_recv(m, msg, tsock->p))) | |
1016 | goto exit; | |
1017 | } | |
1018 | ||
1019 | /* Capture message data (if valid) & compute return value (always) */ | |
c4307285 | 1020 | |
b97bf3fd PL |
1021 | if (!err) { |
1022 | buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle); | |
27a884dc | 1023 | sz = skb_tail_pointer(buf) - buf_crs; |
b97bf3fd PL |
1024 | |
1025 | needed = (buf_len - sz_copied); | |
1026 | sz_to_copy = (sz <= needed) ? sz : needed; | |
1027 | if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) { | |
1028 | res = -EFAULT; | |
1029 | goto exit; | |
1030 | } | |
1031 | sz_copied += sz_to_copy; | |
1032 | ||
1033 | if (sz_to_copy < sz) { | |
1034 | if (!(flags & MSG_PEEK)) | |
1035 | TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy; | |
1036 | goto exit; | |
1037 | } | |
1038 | ||
1039 | crs += sz_to_copy; | |
1040 | } else { | |
1041 | if (sz_copied != 0) | |
1042 | goto exit; /* can't add error msg to valid data */ | |
1043 | ||
1044 | if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control) | |
1045 | res = 0; | |
1046 | else | |
1047 | res = -ECONNRESET; | |
1048 | } | |
1049 | ||
1050 | /* Consume received message (optional) */ | |
1051 | ||
1052 | if (likely(!(flags & MSG_PEEK))) { | |
c4307285 YH |
1053 | if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN)) |
1054 | tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked); | |
b97bf3fd | 1055 | advance_queue(tsock); |
c4307285 | 1056 | } |
b97bf3fd PL |
1057 | |
1058 | /* Loop around if more data is required */ | |
1059 | ||
c4307285 | 1060 | if ((sz_copied < buf_len) /* didn't get all requested data */ |
b97bf3fd PL |
1061 | && (flags & MSG_WAITALL) /* ... and need to wait for more */ |
1062 | && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */ | |
1063 | && (!err) /* ... and haven't reached a FIN */ | |
1064 | ) | |
1065 | goto restart; | |
1066 | ||
1067 | exit: | |
1068 | up(&tsock->sem); | |
a3b0a5a9 | 1069 | return sz_copied ? sz_copied : res; |
b97bf3fd PL |
1070 | } |
1071 | ||
1072 | /** | |
1073 | * queue_overloaded - test if queue overload condition exists | |
1074 | * @queue_size: current size of queue | |
1075 | * @base: nominal maximum size of queue | |
1076 | * @msg: message to be added to queue | |
c4307285 | 1077 | * |
b97bf3fd PL |
1078 | * Returns 1 if queue is currently overloaded, 0 otherwise |
1079 | */ | |
1080 | ||
1081 | static int queue_overloaded(u32 queue_size, u32 base, struct tipc_msg *msg) | |
1082 | { | |
1083 | u32 threshold; | |
1084 | u32 imp = msg_importance(msg); | |
1085 | ||
1086 | if (imp == TIPC_LOW_IMPORTANCE) | |
1087 | threshold = base; | |
1088 | else if (imp == TIPC_MEDIUM_IMPORTANCE) | |
1089 | threshold = base * 2; | |
1090 | else if (imp == TIPC_HIGH_IMPORTANCE) | |
1091 | threshold = base * 100; | |
1092 | else | |
1093 | return 0; | |
1094 | ||
1095 | if (msg_connected(msg)) | |
1096 | threshold *= 4; | |
1097 | ||
1098 | return (queue_size > threshold); | |
1099 | } | |
1100 | ||
c4307285 | 1101 | /** |
b97bf3fd PL |
1102 | * async_disconnect - wrapper function used to disconnect port |
1103 | * @portref: TIPC port reference (passed as pointer-sized value) | |
1104 | */ | |
1105 | ||
1106 | static void async_disconnect(unsigned long portref) | |
1107 | { | |
1108 | tipc_disconnect((u32)portref); | |
1109 | } | |
1110 | ||
c4307285 | 1111 | /** |
b97bf3fd PL |
1112 | * dispatch - handle arriving message |
1113 | * @tport: TIPC port that received message | |
1114 | * @buf: message | |
c4307285 | 1115 | * |
b97bf3fd | 1116 | * Called with port locked. Must not take socket lock to avoid deadlock risk. |
c4307285 | 1117 | * |
b97bf3fd PL |
1118 | * Returns TIPC error status code (TIPC_OK if message is not to be rejected) |
1119 | */ | |
1120 | ||
1121 | static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf) | |
1122 | { | |
1123 | struct tipc_msg *msg = buf_msg(buf); | |
1124 | struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle; | |
1125 | struct socket *sock; | |
1126 | u32 recv_q_len; | |
1127 | ||
1128 | /* Reject message if socket is closing */ | |
1129 | ||
1130 | if (!tsock) | |
1131 | return TIPC_ERR_NO_PORT; | |
1132 | ||
1133 | /* Reject message if it is wrong sort of message for socket */ | |
1134 | ||
1135 | /* | |
1136 | * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD? | |
1137 | * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY | |
1138 | * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC | |
1139 | */ | |
1140 | sock = tsock->sk.sk_socket; | |
1141 | if (sock->state == SS_READY) { | |
1142 | if (msg_connected(msg)) { | |
1143 | msg_dbg(msg, "dispatch filter 1\n"); | |
1144 | return TIPC_ERR_NO_PORT; | |
1145 | } | |
1146 | } else { | |
1147 | if (msg_mcast(msg)) { | |
1148 | msg_dbg(msg, "dispatch filter 2\n"); | |
1149 | return TIPC_ERR_NO_PORT; | |
1150 | } | |
1151 | if (sock->state == SS_CONNECTED) { | |
1152 | if (!msg_connected(msg)) { | |
1153 | msg_dbg(msg, "dispatch filter 3\n"); | |
1154 | return TIPC_ERR_NO_PORT; | |
1155 | } | |
1156 | } | |
1157 | else if (sock->state == SS_CONNECTING) { | |
1158 | if (!msg_connected(msg) && (msg_errcode(msg) == 0)) { | |
1159 | msg_dbg(msg, "dispatch filter 4\n"); | |
1160 | return TIPC_ERR_NO_PORT; | |
1161 | } | |
c4307285 | 1162 | } |
b97bf3fd PL |
1163 | else if (sock->state == SS_LISTENING) { |
1164 | if (msg_connected(msg) || msg_errcode(msg)) { | |
1165 | msg_dbg(msg, "dispatch filter 5\n"); | |
1166 | return TIPC_ERR_NO_PORT; | |
1167 | } | |
c4307285 | 1168 | } |
b97bf3fd PL |
1169 | else if (sock->state == SS_DISCONNECTING) { |
1170 | msg_dbg(msg, "dispatch filter 6\n"); | |
1171 | return TIPC_ERR_NO_PORT; | |
1172 | } | |
1173 | else /* (sock->state == SS_UNCONNECTED) */ { | |
1174 | if (msg_connected(msg) || msg_errcode(msg)) { | |
1175 | msg_dbg(msg, "dispatch filter 7\n"); | |
1176 | return TIPC_ERR_NO_PORT; | |
1177 | } | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | /* Reject message if there isn't room to queue it */ | |
1182 | ||
c4307285 | 1183 | if (unlikely((u32)atomic_read(&tipc_queue_size) > |
b97bf3fd | 1184 | OVERLOAD_LIMIT_BASE)) { |
c4307285 | 1185 | if (queue_overloaded(atomic_read(&tipc_queue_size), |
b97bf3fd PL |
1186 | OVERLOAD_LIMIT_BASE, msg)) |
1187 | return TIPC_ERR_OVERLOAD; | |
c4307285 | 1188 | } |
b97bf3fd PL |
1189 | recv_q_len = skb_queue_len(&tsock->sk.sk_receive_queue); |
1190 | if (unlikely(recv_q_len > (OVERLOAD_LIMIT_BASE / 2))) { | |
c4307285 YH |
1191 | if (queue_overloaded(recv_q_len, |
1192 | OVERLOAD_LIMIT_BASE / 2, msg)) | |
b97bf3fd | 1193 | return TIPC_ERR_OVERLOAD; |
c4307285 | 1194 | } |
b97bf3fd PL |
1195 | |
1196 | /* Initiate connection termination for an incoming 'FIN' */ | |
1197 | ||
1198 | if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) { | |
1199 | sock->state = SS_DISCONNECTING; | |
1200 | /* Note: Use signal since port lock is already taken! */ | |
4323add6 | 1201 | tipc_k_signal((Handler)async_disconnect, tport->ref); |
b97bf3fd PL |
1202 | } |
1203 | ||
1204 | /* Enqueue message (finally!) */ | |
1205 | ||
1206 | msg_dbg(msg,"<DISP<: "); | |
1207 | TIPC_SKB_CB(buf)->handle = msg_data(msg); | |
1208 | atomic_inc(&tipc_queue_size); | |
1209 | skb_queue_tail(&sock->sk->sk_receive_queue, buf); | |
1210 | ||
cfb0c089 AS |
1211 | if (waitqueue_active(sock->sk->sk_sleep)) |
1212 | wake_up_interruptible(sock->sk->sk_sleep); | |
b97bf3fd PL |
1213 | return TIPC_OK; |
1214 | } | |
1215 | ||
c4307285 | 1216 | /** |
b97bf3fd PL |
1217 | * wakeupdispatch - wake up port after congestion |
1218 | * @tport: port to wakeup | |
c4307285 | 1219 | * |
b97bf3fd PL |
1220 | * Called with port lock on. |
1221 | */ | |
1222 | ||
1223 | static void wakeupdispatch(struct tipc_port *tport) | |
1224 | { | |
1225 | struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle; | |
1226 | ||
cfb0c089 AS |
1227 | if (waitqueue_active(tsock->sk.sk_sleep)) |
1228 | wake_up_interruptible(tsock->sk.sk_sleep); | |
b97bf3fd PL |
1229 | } |
1230 | ||
1231 | /** | |
1232 | * connect - establish a connection to another TIPC port | |
1233 | * @sock: socket structure | |
1234 | * @dest: socket address for destination port | |
1235 | * @destlen: size of socket address data structure | |
1236 | * @flags: (unused) | |
1237 | * | |
1238 | * Returns 0 on success, errno otherwise | |
1239 | */ | |
1240 | ||
c4307285 | 1241 | static int connect(struct socket *sock, struct sockaddr *dest, int destlen, |
b97bf3fd PL |
1242 | int flags) |
1243 | { | |
1244 | struct tipc_sock *tsock = tipc_sk(sock->sk); | |
1245 | struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest; | |
1fc54d8f | 1246 | struct msghdr m = {NULL,}; |
b97bf3fd PL |
1247 | struct sk_buff *buf; |
1248 | struct tipc_msg *msg; | |
1249 | int res; | |
1250 | ||
1251 | /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */ | |
1252 | ||
1253 | if (sock->state == SS_READY) | |
1254 | return -EOPNOTSUPP; | |
1255 | ||
51f9cc1f AS |
1256 | /* Issue Posix-compliant error code if socket is in the wrong state */ |
1257 | ||
b97bf3fd PL |
1258 | if (sock->state == SS_LISTENING) |
1259 | return -EOPNOTSUPP; | |
1260 | if (sock->state == SS_CONNECTING) | |
1261 | return -EALREADY; | |
1262 | if (sock->state != SS_UNCONNECTED) | |
c4307285 | 1263 | return -EISCONN; |
b97bf3fd | 1264 | |
51f9cc1f AS |
1265 | /* |
1266 | * Reject connection attempt using multicast address | |
1267 | * | |
1268 | * Note: send_msg() validates the rest of the address fields, | |
1269 | * so there's no need to do it here | |
1270 | */ | |
1271 | ||
1272 | if (dst->addrtype == TIPC_ADDR_MCAST) | |
c4307285 | 1273 | return -EINVAL; |
b97bf3fd PL |
1274 | |
1275 | /* Send a 'SYN-' to destination */ | |
1276 | ||
1277 | m.msg_name = dest; | |
51f9cc1f | 1278 | m.msg_namelen = destlen; |
1fc54d8f | 1279 | if ((res = send_msg(NULL, sock, &m, 0)) < 0) { |
b97bf3fd PL |
1280 | sock->state = SS_DISCONNECTING; |
1281 | return res; | |
1282 | } | |
1283 | ||
c4307285 YH |
1284 | if (down_interruptible(&tsock->sem)) |
1285 | return -ERESTARTSYS; | |
1286 | ||
b97bf3fd PL |
1287 | /* Wait for destination's 'ACK' response */ |
1288 | ||
1289 | res = wait_event_interruptible_timeout(*sock->sk->sk_sleep, | |
c4307285 | 1290 | skb_queue_len(&sock->sk->sk_receive_queue), |
b97bf3fd PL |
1291 | sock->sk->sk_rcvtimeo); |
1292 | buf = skb_peek(&sock->sk->sk_receive_queue); | |
1293 | if (res > 0) { | |
1294 | msg = buf_msg(buf); | |
c4307285 YH |
1295 | res = auto_connect(sock, tsock, msg); |
1296 | if (!res) { | |
b97bf3fd PL |
1297 | if (!msg_data_sz(msg)) |
1298 | advance_queue(tsock); | |
1299 | } | |
1300 | } else { | |
1301 | if (res == 0) { | |
1302 | res = -ETIMEDOUT; | |
1303 | } else | |
c4307285 | 1304 | { /* leave "res" unchanged */ } |
b97bf3fd PL |
1305 | sock->state = SS_DISCONNECTING; |
1306 | } | |
1307 | ||
1308 | up(&tsock->sem); | |
1309 | return res; | |
1310 | } | |
1311 | ||
c4307285 | 1312 | /** |
b97bf3fd PL |
1313 | * listen - allow socket to listen for incoming connections |
1314 | * @sock: socket structure | |
1315 | * @len: (unused) | |
c4307285 | 1316 | * |
b97bf3fd PL |
1317 | * Returns 0 on success, errno otherwise |
1318 | */ | |
1319 | ||
1320 | static int listen(struct socket *sock, int len) | |
1321 | { | |
1322 | /* REQUIRES SOCKET LOCKING OF SOME SORT? */ | |
1323 | ||
1324 | if (sock->state == SS_READY) | |
1325 | return -EOPNOTSUPP; | |
1326 | if (sock->state != SS_UNCONNECTED) | |
1327 | return -EINVAL; | |
1328 | sock->state = SS_LISTENING; | |
c4307285 | 1329 | return 0; |
b97bf3fd PL |
1330 | } |
1331 | ||
c4307285 | 1332 | /** |
b97bf3fd PL |
1333 | * accept - wait for connection request |
1334 | * @sock: listening socket | |
1335 | * @newsock: new socket that is to be connected | |
1336 | * @flags: file-related flags associated with socket | |
c4307285 | 1337 | * |
b97bf3fd PL |
1338 | * Returns 0 on success, errno otherwise |
1339 | */ | |
1340 | ||
1341 | static int accept(struct socket *sock, struct socket *newsock, int flags) | |
1342 | { | |
1343 | struct tipc_sock *tsock = tipc_sk(sock->sk); | |
1344 | struct sk_buff *buf; | |
1345 | int res = -EFAULT; | |
1346 | ||
1347 | if (sock->state == SS_READY) | |
1348 | return -EOPNOTSUPP; | |
1349 | if (sock->state != SS_LISTENING) | |
1350 | return -EINVAL; | |
c4307285 YH |
1351 | |
1352 | if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) && | |
b97bf3fd PL |
1353 | (flags & O_NONBLOCK))) |
1354 | return -EWOULDBLOCK; | |
1355 | ||
1356 | if (down_interruptible(&tsock->sem)) | |
1357 | return -ERESTARTSYS; | |
1358 | ||
c4307285 | 1359 | if (wait_event_interruptible(*sock->sk->sk_sleep, |
b97bf3fd PL |
1360 | skb_queue_len(&sock->sk->sk_receive_queue))) { |
1361 | res = -ERESTARTSYS; | |
1362 | goto exit; | |
1363 | } | |
1364 | buf = skb_peek(&sock->sk->sk_receive_queue); | |
1365 | ||
1366 | res = tipc_create(newsock, 0); | |
1367 | if (!res) { | |
1368 | struct tipc_sock *new_tsock = tipc_sk(newsock->sk); | |
1369 | struct tipc_portid id; | |
1370 | struct tipc_msg *msg = buf_msg(buf); | |
1371 | u32 new_ref = new_tsock->p->ref; | |
1372 | ||
1373 | id.ref = msg_origport(msg); | |
1374 | id.node = msg_orignode(msg); | |
1375 | tipc_connect2port(new_ref, &id); | |
1376 | newsock->state = SS_CONNECTED; | |
1377 | ||
1378 | tipc_set_portimportance(new_ref, msg_importance(msg)); | |
1379 | if (msg_named(msg)) { | |
1380 | new_tsock->p->conn_type = msg_nametype(msg); | |
1381 | new_tsock->p->conn_instance = msg_nameinst(msg); | |
1382 | } | |
1383 | ||
c4307285 | 1384 | /* |
b97bf3fd PL |
1385 | * Respond to 'SYN-' by discarding it & returning 'ACK'-. |
1386 | * Respond to 'SYN+' by queuing it on new socket. | |
1387 | */ | |
1388 | ||
1389 | msg_dbg(msg,"<ACC<: "); | |
c4307285 YH |
1390 | if (!msg_data_sz(msg)) { |
1391 | struct msghdr m = {NULL,}; | |
b97bf3fd | 1392 | |
c4307285 YH |
1393 | send_packet(NULL, newsock, &m, 0); |
1394 | advance_queue(tsock); | |
1395 | } else { | |
b97bf3fd PL |
1396 | sock_lock(tsock); |
1397 | skb_dequeue(&sock->sk->sk_receive_queue); | |
1398 | sock_unlock(tsock); | |
1399 | skb_queue_head(&newsock->sk->sk_receive_queue, buf); | |
1400 | } | |
1401 | } | |
1402 | exit: | |
1403 | up(&tsock->sem); | |
1404 | return res; | |
1405 | } | |
1406 | ||
1407 | /** | |
1408 | * shutdown - shutdown socket connection | |
1409 | * @sock: socket structure | |
e9024f0f | 1410 | * @how: direction to close (unused; always treated as read + write) |
b97bf3fd PL |
1411 | * |
1412 | * Terminates connection (if necessary), then purges socket's receive queue. | |
c4307285 | 1413 | * |
b97bf3fd PL |
1414 | * Returns 0 on success, errno otherwise |
1415 | */ | |
1416 | ||
1417 | static int shutdown(struct socket *sock, int how) | |
1418 | { | |
1419 | struct tipc_sock* tsock = tipc_sk(sock->sk); | |
1420 | struct sk_buff *buf; | |
1421 | int res; | |
1422 | ||
1423 | /* Could return -EINVAL for an invalid "how", but why bother? */ | |
1424 | ||
1425 | if (down_interruptible(&tsock->sem)) | |
1426 | return -ERESTARTSYS; | |
1427 | ||
1428 | sock_lock(tsock); | |
1429 | ||
1430 | switch (sock->state) { | |
1431 | case SS_CONNECTED: | |
1432 | ||
1433 | /* Send 'FIN+' or 'FIN-' message to peer */ | |
1434 | ||
1435 | sock_unlock(tsock); | |
1436 | restart: | |
1437 | if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { | |
1438 | atomic_dec(&tipc_queue_size); | |
1439 | if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) { | |
1440 | buf_discard(buf); | |
1441 | goto restart; | |
1442 | } | |
1443 | tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN); | |
1444 | } | |
1445 | else { | |
1446 | tipc_shutdown(tsock->p->ref); | |
1447 | } | |
1448 | sock_lock(tsock); | |
1449 | ||
1450 | /* fall through */ | |
1451 | ||
1452 | case SS_DISCONNECTING: | |
1453 | ||
1454 | /* Discard any unreceived messages */ | |
1455 | ||
1456 | while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) { | |
1457 | atomic_dec(&tipc_queue_size); | |
1458 | buf_discard(buf); | |
1459 | } | |
1460 | tsock->p->conn_unacked = 0; | |
1461 | ||
1462 | /* fall through */ | |
1463 | ||
1464 | case SS_CONNECTING: | |
1465 | sock->state = SS_DISCONNECTING; | |
1466 | res = 0; | |
1467 | break; | |
1468 | ||
1469 | default: | |
1470 | res = -ENOTCONN; | |
1471 | } | |
1472 | ||
1473 | sock_unlock(tsock); | |
1474 | ||
1475 | up(&tsock->sem); | |
1476 | return res; | |
1477 | } | |
1478 | ||
1479 | /** | |
1480 | * setsockopt - set socket option | |
1481 | * @sock: socket structure | |
1482 | * @lvl: option level | |
1483 | * @opt: option identifier | |
1484 | * @ov: pointer to new option value | |
1485 | * @ol: length of option value | |
c4307285 YH |
1486 | * |
1487 | * For stream sockets only, accepts and ignores all IPPROTO_TCP options | |
b97bf3fd | 1488 | * (to ease compatibility). |
c4307285 | 1489 | * |
b97bf3fd PL |
1490 | * Returns 0 on success, errno otherwise |
1491 | */ | |
1492 | ||
c4307285 | 1493 | static int setsockopt(struct socket *sock, |
e9024f0f | 1494 | int lvl, int opt, char __user *ov, int ol) |
b97bf3fd PL |
1495 | { |
1496 | struct tipc_sock *tsock = tipc_sk(sock->sk); | |
1497 | u32 value; | |
1498 | int res; | |
1499 | ||
c4307285 YH |
1500 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1501 | return 0; | |
b97bf3fd PL |
1502 | if (lvl != SOL_TIPC) |
1503 | return -ENOPROTOOPT; | |
1504 | if (ol < sizeof(value)) | |
1505 | return -EINVAL; | |
c4307285 | 1506 | if ((res = get_user(value, (u32 __user *)ov))) |
b97bf3fd PL |
1507 | return res; |
1508 | ||
c4307285 | 1509 | if (down_interruptible(&tsock->sem)) |
b97bf3fd | 1510 | return -ERESTARTSYS; |
c4307285 | 1511 | |
b97bf3fd PL |
1512 | switch (opt) { |
1513 | case TIPC_IMPORTANCE: | |
1514 | res = tipc_set_portimportance(tsock->p->ref, value); | |
1515 | break; | |
1516 | case TIPC_SRC_DROPPABLE: | |
1517 | if (sock->type != SOCK_STREAM) | |
1518 | res = tipc_set_portunreliable(tsock->p->ref, value); | |
c4307285 | 1519 | else |
b97bf3fd PL |
1520 | res = -ENOPROTOOPT; |
1521 | break; | |
1522 | case TIPC_DEST_DROPPABLE: | |
1523 | res = tipc_set_portunreturnable(tsock->p->ref, value); | |
1524 | break; | |
1525 | case TIPC_CONN_TIMEOUT: | |
1526 | sock->sk->sk_rcvtimeo = (value * HZ / 1000); | |
1527 | break; | |
1528 | default: | |
1529 | res = -EINVAL; | |
1530 | } | |
1531 | ||
1532 | up(&tsock->sem); | |
1533 | return res; | |
1534 | } | |
1535 | ||
1536 | /** | |
1537 | * getsockopt - get socket option | |
1538 | * @sock: socket structure | |
1539 | * @lvl: option level | |
1540 | * @opt: option identifier | |
1541 | * @ov: receptacle for option value | |
1542 | * @ol: receptacle for length of option value | |
c4307285 YH |
1543 | * |
1544 | * For stream sockets only, returns 0 length result for all IPPROTO_TCP options | |
b97bf3fd | 1545 | * (to ease compatibility). |
c4307285 | 1546 | * |
b97bf3fd PL |
1547 | * Returns 0 on success, errno otherwise |
1548 | */ | |
1549 | ||
c4307285 | 1550 | static int getsockopt(struct socket *sock, |
28c4dadd | 1551 | int lvl, int opt, char __user *ov, int __user *ol) |
b97bf3fd PL |
1552 | { |
1553 | struct tipc_sock *tsock = tipc_sk(sock->sk); | |
c4307285 | 1554 | int len; |
b97bf3fd | 1555 | u32 value; |
c4307285 | 1556 | int res; |
b97bf3fd | 1557 | |
c4307285 YH |
1558 | if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM)) |
1559 | return put_user(0, ol); | |
b97bf3fd PL |
1560 | if (lvl != SOL_TIPC) |
1561 | return -ENOPROTOOPT; | |
c4307285 YH |
1562 | if ((res = get_user(len, ol))) |
1563 | return res; | |
b97bf3fd | 1564 | |
c4307285 | 1565 | if (down_interruptible(&tsock->sem)) |
b97bf3fd PL |
1566 | return -ERESTARTSYS; |
1567 | ||
1568 | switch (opt) { | |
1569 | case TIPC_IMPORTANCE: | |
1570 | res = tipc_portimportance(tsock->p->ref, &value); | |
1571 | break; | |
1572 | case TIPC_SRC_DROPPABLE: | |
1573 | res = tipc_portunreliable(tsock->p->ref, &value); | |
1574 | break; | |
1575 | case TIPC_DEST_DROPPABLE: | |
1576 | res = tipc_portunreturnable(tsock->p->ref, &value); | |
1577 | break; | |
1578 | case TIPC_CONN_TIMEOUT: | |
1579 | value = (sock->sk->sk_rcvtimeo * 1000) / HZ; | |
1580 | break; | |
1581 | default: | |
1582 | res = -EINVAL; | |
1583 | } | |
1584 | ||
1585 | if (res) { | |
1586 | /* "get" failed */ | |
1587 | } | |
1588 | else if (len < sizeof(value)) { | |
1589 | res = -EINVAL; | |
1590 | } | |
1591 | else if ((res = copy_to_user(ov, &value, sizeof(value)))) { | |
1592 | /* couldn't return value */ | |
1593 | } | |
1594 | else { | |
1595 | res = put_user(sizeof(value), ol); | |
1596 | } | |
1597 | ||
c4307285 | 1598 | up(&tsock->sem); |
b97bf3fd PL |
1599 | return res; |
1600 | } | |
1601 | ||
b97bf3fd PL |
1602 | /** |
1603 | * Protocol switches for the various types of TIPC sockets | |
1604 | */ | |
1605 | ||
1606 | static struct proto_ops msg_ops = { | |
1607 | .owner = THIS_MODULE, | |
1608 | .family = AF_TIPC, | |
1609 | .release = release, | |
1610 | .bind = bind, | |
1611 | .connect = connect, | |
5eee6a6d | 1612 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1613 | .accept = accept, |
1614 | .getname = get_name, | |
1615 | .poll = poll, | |
5eee6a6d | 1616 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1617 | .listen = listen, |
1618 | .shutdown = shutdown, | |
1619 | .setsockopt = setsockopt, | |
1620 | .getsockopt = getsockopt, | |
1621 | .sendmsg = send_msg, | |
1622 | .recvmsg = recv_msg, | |
5eee6a6d AS |
1623 | .mmap = sock_no_mmap, |
1624 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1625 | }; |
1626 | ||
1627 | static struct proto_ops packet_ops = { | |
1628 | .owner = THIS_MODULE, | |
1629 | .family = AF_TIPC, | |
1630 | .release = release, | |
1631 | .bind = bind, | |
1632 | .connect = connect, | |
5eee6a6d | 1633 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1634 | .accept = accept, |
1635 | .getname = get_name, | |
1636 | .poll = poll, | |
5eee6a6d | 1637 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1638 | .listen = listen, |
1639 | .shutdown = shutdown, | |
1640 | .setsockopt = setsockopt, | |
1641 | .getsockopt = getsockopt, | |
1642 | .sendmsg = send_packet, | |
1643 | .recvmsg = recv_msg, | |
5eee6a6d AS |
1644 | .mmap = sock_no_mmap, |
1645 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1646 | }; |
1647 | ||
1648 | static struct proto_ops stream_ops = { | |
1649 | .owner = THIS_MODULE, | |
1650 | .family = AF_TIPC, | |
1651 | .release = release, | |
1652 | .bind = bind, | |
1653 | .connect = connect, | |
5eee6a6d | 1654 | .socketpair = sock_no_socketpair, |
b97bf3fd PL |
1655 | .accept = accept, |
1656 | .getname = get_name, | |
1657 | .poll = poll, | |
5eee6a6d | 1658 | .ioctl = sock_no_ioctl, |
b97bf3fd PL |
1659 | .listen = listen, |
1660 | .shutdown = shutdown, | |
1661 | .setsockopt = setsockopt, | |
1662 | .getsockopt = getsockopt, | |
1663 | .sendmsg = send_stream, | |
1664 | .recvmsg = recv_stream, | |
5eee6a6d AS |
1665 | .mmap = sock_no_mmap, |
1666 | .sendpage = sock_no_sendpage | |
b97bf3fd PL |
1667 | }; |
1668 | ||
1669 | static struct net_proto_family tipc_family_ops = { | |
1670 | .owner = THIS_MODULE, | |
1671 | .family = AF_TIPC, | |
1672 | .create = tipc_create | |
1673 | }; | |
1674 | ||
1675 | static struct proto tipc_proto = { | |
1676 | .name = "TIPC", | |
1677 | .owner = THIS_MODULE, | |
1678 | .obj_size = sizeof(struct tipc_sock) | |
1679 | }; | |
1680 | ||
1681 | /** | |
4323add6 | 1682 | * tipc_socket_init - initialize TIPC socket interface |
c4307285 | 1683 | * |
b97bf3fd PL |
1684 | * Returns 0 on success, errno otherwise |
1685 | */ | |
4323add6 | 1686 | int tipc_socket_init(void) |
b97bf3fd PL |
1687 | { |
1688 | int res; | |
1689 | ||
c4307285 | 1690 | res = proto_register(&tipc_proto, 1); |
b97bf3fd | 1691 | if (res) { |
d0a14a9d | 1692 | err("Failed to register TIPC protocol type\n"); |
b97bf3fd PL |
1693 | goto out; |
1694 | } | |
1695 | ||
1696 | res = sock_register(&tipc_family_ops); | |
1697 | if (res) { | |
d0a14a9d | 1698 | err("Failed to register TIPC socket type\n"); |
b97bf3fd PL |
1699 | proto_unregister(&tipc_proto); |
1700 | goto out; | |
1701 | } | |
1702 | ||
1703 | sockets_enabled = 1; | |
1704 | out: | |
1705 | return res; | |
1706 | } | |
1707 | ||
1708 | /** | |
4323add6 | 1709 | * tipc_socket_stop - stop TIPC socket interface |
b97bf3fd | 1710 | */ |
4323add6 | 1711 | void tipc_socket_stop(void) |
b97bf3fd PL |
1712 | { |
1713 | if (!sockets_enabled) | |
1714 | return; | |
1715 | ||
1716 | sockets_enabled = 0; | |
1717 | sock_unregister(tipc_family_ops.family); | |
1718 | proto_unregister(&tipc_proto); | |
1719 | } | |
1720 |