aboutsummaryrefslogtreecommitdiffstats
path: root/net/tipc/socket.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/tipc/socket.c')
-rw-r--r--net/tipc/socket.c1722
1 files changed, 1722 insertions, 0 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
new file mode 100644
index 000000000000..22dcb724e760
--- /dev/null
+++ b/net/tipc/socket.c
@@ -0,0 +1,1722 @@
1/*
2 * net/tipc/socket.c: TIPC socket API
3 *
4 * Copyright (c) 2003-2005, Ericsson Research Canada
5 * Copyright (c) 2004-2005, Wind River Systems
6 * Copyright (c) 2005-2006, Ericsson AB
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * Redistributions of source code must retain the above copyright notice, this
13 * list of conditions and the following disclaimer.
14 * Redistributions in binary form must reproduce the above copyright notice,
15 * this list of conditions and the following disclaimer in the documentation
16 * and/or other materials provided with the distribution.
17 * Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from this
19 * software without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
22 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
25 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
32 */
33
34#include <linux/module.h>
35#include <linux/types.h>
36#include <linux/net.h>
37#include <linux/socket.h>
38#include <linux/errno.h>
39#include <linux/mm.h>
40#include <linux/slab.h>
41#include <linux/poll.h>
42#include <linux/version.h>
43#include <linux/fcntl.h>
44#include <linux/version.h>
45#include <asm/semaphore.h>
46#include <asm/string.h>
47#include <asm/atomic.h>
48#include <net/sock.h>
49
50#include <linux/tipc.h>
51#include <net/tipc/tipc_msg.h>
52#include <net/tipc/tipc_port.h>
53
54#include "core.h"
55
56#define SS_LISTENING -1 /* socket is listening */
57#define SS_READY -2 /* socket is connectionless */
58
59#define OVERLOAD_LIMIT_BASE 5000
60
61struct tipc_sock {
62 struct sock sk;
63 struct tipc_port *p;
64 struct semaphore sem;
65};
66
67#define tipc_sk(sk) ((struct tipc_sock*)sk)
68
69static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
70static void wakeupdispatch(struct tipc_port *tport);
71
72static struct proto_ops packet_ops;
73static struct proto_ops stream_ops;
74static struct proto_ops msg_ops;
75
76static struct proto tipc_proto;
77
78static int sockets_enabled = 0;
79
80static atomic_t tipc_queue_size = ATOMIC_INIT(0);
81
82
83/*
84 * sock_lock(): Lock a port/socket pair. lock_sock() can
85 * not be used here, since the same lock must protect ports
86 * with non-socket interfaces.
87 * See net.c for description of locking policy.
88 */
89static inline void sock_lock(struct tipc_sock* tsock)
90{
91 spin_lock_bh(tsock->p->lock);
92}
93
94/*
95 * sock_unlock(): Unlock a port/socket pair
96 */
97static inline void sock_unlock(struct tipc_sock* tsock)
98{
99 spin_unlock_bh(tsock->p->lock);
100}
101
102/**
103 * pollmask - determine the current set of poll() events for a socket
104 * @sock: socket structure
105 *
106 * TIPC sets the returned events as follows:
107 * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty
108 * or if a connection-oriented socket is does not have an active connection
109 * (i.e. a read operation will not block).
110 * b) POLLOUT is set except when a socket's connection has been terminated
111 * (i.e. a write operation will not block).
112 * c) POLLHUP is set when a socket's connection has been terminated.
113 *
114 * IMPORTANT: The fact that a read or write operation will not block does NOT
115 * imply that the operation will succeed!
116 *
117 * Returns pollmask value
118 */
119
120static inline u32 pollmask(struct socket *sock)
121{
122 u32 mask;
123
124 if ((skb_queue_len(&sock->sk->sk_receive_queue) != 0) ||
125 (sock->state == SS_UNCONNECTED) ||
126 (sock->state == SS_DISCONNECTING))
127 mask = (POLLRDNORM | POLLIN);
128 else
129 mask = 0;
130
131 if (sock->state == SS_DISCONNECTING)
132 mask |= POLLHUP;
133 else
134 mask |= POLLOUT;
135
136 return mask;
137}
138
139
140/**
141 * advance_queue - discard first buffer in queue
142 * @tsock: TIPC socket
143 */
144
145static inline void advance_queue(struct tipc_sock *tsock)
146{
147 sock_lock(tsock);
148 buf_discard(skb_dequeue(&tsock->sk.sk_receive_queue));
149 sock_unlock(tsock);
150 atomic_dec(&tipc_queue_size);
151}
152
153/**
154 * tipc_create - create a TIPC socket
155 * @sock: pre-allocated socket structure
156 * @protocol: protocol indicator (must be 0)
157 *
158 * This routine creates and attaches a 'struct sock' to the 'struct socket',
159 * then create and attaches a TIPC port to the 'struct sock' part.
160 *
161 * Returns 0 on success, errno otherwise
162 */
163static int tipc_create(struct socket *sock, int protocol)
164{
165 struct tipc_sock *tsock;
166 struct tipc_port *port;
167 struct sock *sk;
168 u32 ref;
169
170 if ((sock->type != SOCK_STREAM) &&
171 (sock->type != SOCK_SEQPACKET) &&
172 (sock->type != SOCK_DGRAM) &&
173 (sock->type != SOCK_RDM))
174 return -EPROTOTYPE;
175
176 if (unlikely(protocol != 0))
177 return -EPROTONOSUPPORT;
178
179 ref = tipc_createport_raw(0, &dispatch, &wakeupdispatch, TIPC_LOW_IMPORTANCE);
180 if (unlikely(!ref))
181 return -ENOMEM;
182
183 sock->state = SS_UNCONNECTED;
184
185 switch (sock->type) {
186 case SOCK_STREAM:
187 sock->ops = &stream_ops;
188 break;
189 case SOCK_SEQPACKET:
190 sock->ops = &packet_ops;
191 break;
192 case SOCK_DGRAM:
193 tipc_set_portunreliable(ref, 1);
194 /* fall through */
195 case SOCK_RDM:
196 tipc_set_portunreturnable(ref, 1);
197 sock->ops = &msg_ops;
198 sock->state = SS_READY;
199 break;
200 }
201
202 sk = sk_alloc(AF_TIPC, GFP_KERNEL, &tipc_proto, 1);
203 if (!sk) {
204 tipc_deleteport(ref);
205 return -ENOMEM;
206 }
207
208 sock_init_data(sock, sk);
209 init_waitqueue_head(sk->sk_sleep);
210 sk->sk_rcvtimeo = 8 * HZ; /* default connect timeout = 8s */
211
212 tsock = tipc_sk(sk);
213 port = tipc_get_port(ref);
214
215 tsock->p = port;
216 port->usr_handle = tsock;
217
218 init_MUTEX(&tsock->sem);
219
220 dbg("sock_create: %x\n",tsock);
221
222 atomic_inc(&tipc_user_count);
223
224 return 0;
225}
226
227/**
228 * release - destroy a TIPC socket
229 * @sock: socket to destroy
230 *
231 * This routine cleans up any messages that are still queued on the socket.
232 * For DGRAM and RDM socket types, all queued messages are rejected.
233 * For SEQPACKET and STREAM socket types, the first message is rejected
234 * and any others are discarded. (If the first message on a STREAM socket
235 * is partially-read, it is discarded and the next one is rejected instead.)
236 *
237 * NOTE: Rejected messages are not necessarily returned to the sender! They
238 * are returned or discarded according to the "destination droppable" setting
239 * specified for the message by the sender.
240 *
241 * Returns 0 on success, errno otherwise
242 */
243
244static int release(struct socket *sock)
245{
246 struct tipc_sock *tsock = tipc_sk(sock->sk);
247 struct sock *sk = sock->sk;
248 int res = TIPC_OK;
249 struct sk_buff *buf;
250
251 dbg("sock_delete: %x\n",tsock);
252 if (!tsock)
253 return 0;
254 down_interruptible(&tsock->sem);
255 if (!sock->sk) {
256 up(&tsock->sem);
257 return 0;
258 }
259
260 /* Reject unreceived messages, unless no longer connected */
261
262 while (sock->state != SS_DISCONNECTING) {
263 sock_lock(tsock);
264 buf = skb_dequeue(&sk->sk_receive_queue);
265 if (!buf)
266 tsock->p->usr_handle = 0;
267 sock_unlock(tsock);
268 if (!buf)
269 break;
270 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf)))
271 buf_discard(buf);
272 else
273 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
274 atomic_dec(&tipc_queue_size);
275 }
276
277 /* Delete TIPC port */
278
279 res = tipc_deleteport(tsock->p->ref);
280 sock->sk = NULL;
281
282 /* Discard any remaining messages */
283
284 while ((buf = skb_dequeue(&sk->sk_receive_queue))) {
285 buf_discard(buf);
286 atomic_dec(&tipc_queue_size);
287 }
288
289 up(&tsock->sem);
290
291 sock_put(sk);
292
293 atomic_dec(&tipc_user_count);
294 return res;
295}
296
297/**
298 * bind - associate or disassocate TIPC name(s) with a socket
299 * @sock: socket structure
300 * @uaddr: socket address describing name(s) and desired operation
301 * @uaddr_len: size of socket address data structure
302 *
303 * Name and name sequence binding is indicated using a positive scope value;
304 * a negative scope value unbinds the specified name. Specifying no name
305 * (i.e. a socket address length of 0) unbinds all names from the socket.
306 *
307 * Returns 0 on success, errno otherwise
308 */
309
310static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
311{
312 struct tipc_sock *tsock = tipc_sk(sock->sk);
313 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
314 int res;
315
316 if (down_interruptible(&tsock->sem))
317 return -ERESTARTSYS;
318
319 if (unlikely(!uaddr_len)) {
320 res = tipc_withdraw(tsock->p->ref, 0, 0);
321 goto exit;
322 }
323
324 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
325 res = -EINVAL;
326 goto exit;
327 }
328
329 if (addr->family != AF_TIPC) {
330 res = -EAFNOSUPPORT;
331 goto exit;
332 }
333 if (addr->addrtype == TIPC_ADDR_NAME)
334 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
335 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
336 res = -EAFNOSUPPORT;
337 goto exit;
338 }
339
340 if (addr->scope > 0)
341 res = tipc_publish(tsock->p->ref, addr->scope,
342 &addr->addr.nameseq);
343 else
344 res = tipc_withdraw(tsock->p->ref, -addr->scope,
345 &addr->addr.nameseq);
346exit:
347 up(&tsock->sem);
348 return res;
349}
350
351/**
352 * get_name - get port ID of socket or peer socket
353 * @sock: socket structure
354 * @uaddr: area for returned socket address
355 * @uaddr_len: area for returned length of socket address
356 * @peer: 0 to obtain socket name, 1 to obtain peer socket name
357 *
358 * Returns 0 on success, errno otherwise
359 */
360
361static int get_name(struct socket *sock, struct sockaddr *uaddr,
362 int *uaddr_len, int peer)
363{
364 struct tipc_sock *tsock = tipc_sk(sock->sk);
365 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
366 u32 res;
367
368 if (down_interruptible(&tsock->sem))
369 return -ERESTARTSYS;
370
371 *uaddr_len = sizeof(*addr);
372 addr->addrtype = TIPC_ADDR_ID;
373 addr->family = AF_TIPC;
374 addr->scope = 0;
375 if (peer)
376 res = tipc_peer(tsock->p->ref, &addr->addr.id);
377 else
378 res = tipc_ownidentity(tsock->p->ref, &addr->addr.id);
379 addr->addr.name.domain = 0;
380
381 up(&tsock->sem);
382 return res;
383}
384
385/**
386 * poll - read and possibly block on pollmask
387 * @file: file structure associated with the socket
388 * @sock: socket for which to calculate the poll bits
389 * @wait: ???
390 *
391 * Returns the pollmask
392 */
393
394static unsigned int poll(struct file *file, struct socket *sock,
395 poll_table *wait)
396{
397 poll_wait(file, sock->sk->sk_sleep, wait);
398 /* NEED LOCK HERE? */
399 return pollmask(sock);
400}
401
402/**
403 * dest_name_check - verify user is permitted to send to specified port name
404 * @dest: destination address
405 * @m: descriptor for message to be sent
406 *
407 * Prevents restricted configuration commands from being issued by
408 * unauthorized users.
409 *
410 * Returns 0 if permission is granted, otherwise errno
411 */
412
413static inline int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
414{
415 struct tipc_cfg_msg_hdr hdr;
416
417 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
418 return 0;
419 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
420 return 0;
421
422 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
423 return -EACCES;
424
425 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
426 return -EFAULT;
427 if ((ntohs(hdr.tcm_type) & 0xC000) & (!capable(CAP_NET_ADMIN)))
428 return -EACCES;
429
430 return 0;
431}
432
433/**
434 * send_msg - send message in connectionless manner
435 * @iocb: (unused)
436 * @sock: socket structure
437 * @m: message to send
438 * @total_len: (unused)
439 *
440 * Message must have an destination specified explicitly.
441 * Used for SOCK_RDM and SOCK_DGRAM messages,
442 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
443 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
444 *
445 * Returns the number of bytes sent on success, or errno otherwise
446 */
447
448static int send_msg(struct kiocb *iocb, struct socket *sock,
449 struct msghdr *m, size_t total_len)
450{
451 struct tipc_sock *tsock = tipc_sk(sock->sk);
452 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
453 struct sk_buff *buf;
454 int needs_conn;
455 int res = -EINVAL;
456
457 if (unlikely(!dest))
458 return -EDESTADDRREQ;
459 if (unlikely(dest->family != AF_TIPC))
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;
471 }
472
473 if (down_interruptible(&tsock->sem))
474 return -ERESTARTSYS;
475
476 if (needs_conn) {
477
478 /* Abort any pending connection attempts (very unlikely) */
479
480 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
481 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
482 atomic_dec(&tipc_queue_size);
483 }
484
485 sock->state = SS_CONNECTING;
486 }
487
488 do {
489 if (dest->addrtype == TIPC_ADDR_NAME) {
490 if ((res = dest_name_check(dest, m)))
491 goto exit;
492 res = tipc_send2name(tsock->p->ref,
493 &dest->addr.name.name,
494 dest->addr.name.domain,
495 m->msg_iovlen,
496 m->msg_iov);
497 }
498 else if (dest->addrtype == TIPC_ADDR_ID) {
499 res = tipc_send2port(tsock->p->ref,
500 &dest->addr.id,
501 m->msg_iovlen,
502 m->msg_iov);
503 }
504 else if (dest->addrtype == TIPC_ADDR_MCAST) {
505 if (needs_conn) {
506 res = -EOPNOTSUPP;
507 goto exit;
508 }
509 if ((res = dest_name_check(dest, m)))
510 goto exit;
511 res = tipc_multicast(tsock->p->ref,
512 &dest->addr.nameseq,
513 0,
514 m->msg_iovlen,
515 m->msg_iov);
516 }
517 if (likely(res != -ELINKCONG)) {
518exit:
519 up(&tsock->sem);
520 return res;
521 }
522 if (m->msg_flags & MSG_DONTWAIT) {
523 res = -EWOULDBLOCK;
524 goto exit;
525 }
526 if (wait_event_interruptible(*sock->sk->sk_sleep,
527 !tsock->p->congested)) {
528 res = -ERESTARTSYS;
529 goto exit;
530 }
531 } while (1);
532}
533
534/**
535 * send_packet - send a connection-oriented message
536 * @iocb: (unused)
537 * @sock: socket structure
538 * @m: message to send
539 * @total_len: (unused)
540 *
541 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
542 *
543 * Returns the number of bytes sent on success, or errno otherwise
544 */
545
546static int send_packet(struct kiocb *iocb, struct socket *sock,
547 struct msghdr *m, size_t total_len)
548{
549 struct tipc_sock *tsock = tipc_sk(sock->sk);
550 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
551 int res;
552
553 /* Handle implied connection establishment */
554
555 if (unlikely(dest))
556 return send_msg(iocb, sock, m, total_len);
557
558 if (down_interruptible(&tsock->sem)) {
559 return -ERESTARTSYS;
560 }
561
562 if (unlikely(sock->state != SS_CONNECTED)) {
563 if (sock->state == SS_DISCONNECTING)
564 res = -EPIPE;
565 else
566 res = -ENOTCONN;
567 goto exit;
568 }
569
570 do {
571 res = tipc_send(tsock->p->ref, m->msg_iovlen, m->msg_iov);
572 if (likely(res != -ELINKCONG)) {
573exit:
574 up(&tsock->sem);
575 return res;
576 }
577 if (m->msg_flags & MSG_DONTWAIT) {
578 res = -EWOULDBLOCK;
579 goto exit;
580 }
581 if (wait_event_interruptible(*sock->sk->sk_sleep,
582 !tsock->p->congested)) {
583 res = -ERESTARTSYS;
584 goto exit;
585 }
586 } while (1);
587}
588
589/**
590 * send_stream - send stream-oriented data
591 * @iocb: (unused)
592 * @sock: socket structure
593 * @m: data to send
594 * @total_len: total length of data to be sent
595 *
596 * Used for SOCK_STREAM data.
597 *
598 * Returns the number of bytes sent on success, or errno otherwise
599 */
600
601
602static int send_stream(struct kiocb *iocb, struct socket *sock,
603 struct msghdr *m, size_t total_len)
604{
605 struct msghdr my_msg;
606 struct iovec my_iov;
607 struct iovec *curr_iov;
608 int curr_iovlen;
609 char __user *curr_start;
610 int curr_left;
611 int bytes_to_send;
612 int res;
613
614 if (likely(total_len <= TIPC_MAX_USER_MSG_SIZE))
615 return send_packet(iocb, sock, m, total_len);
616
617 /* Can only send large data streams if already connected */
618
619 if (unlikely(sock->state != SS_CONNECTED)) {
620 if (sock->state == SS_DISCONNECTING)
621 return -EPIPE;
622 else
623 return -ENOTCONN;
624 }
625
626 /*
627 * Send each iovec entry using one or more messages
628 *
629 * Note: This algorithm is good for the most likely case
630 * (i.e. one large iovec entry), but could be improved to pass sets
631 * of small iovec entries into send_packet().
632 */
633
634 my_msg = *m;
635 curr_iov = my_msg.msg_iov;
636 curr_iovlen = my_msg.msg_iovlen;
637 my_msg.msg_iov = &my_iov;
638 my_msg.msg_iovlen = 1;
639
640 while (curr_iovlen--) {
641 curr_start = curr_iov->iov_base;
642 curr_left = curr_iov->iov_len;
643
644 while (curr_left) {
645 bytes_to_send = (curr_left < TIPC_MAX_USER_MSG_SIZE)
646 ? curr_left : TIPC_MAX_USER_MSG_SIZE;
647 my_iov.iov_base = curr_start;
648 my_iov.iov_len = bytes_to_send;
649 if ((res = send_packet(iocb, sock, &my_msg, 0)) < 0)
650 return res;
651 curr_left -= bytes_to_send;
652 curr_start += bytes_to_send;
653 }
654
655 curr_iov++;
656 }
657
658 return total_len;
659}
660
661/**
662 * auto_connect - complete connection setup to a remote port
663 * @sock: socket structure
664 * @tsock: TIPC-specific socket structure
665 * @msg: peer's response message
666 *
667 * Returns 0 on success, errno otherwise
668 */
669
670static int auto_connect(struct socket *sock, struct tipc_sock *tsock,
671 struct tipc_msg *msg)
672{
673 struct tipc_portid peer;
674
675 if (msg_errcode(msg)) {
676 sock->state = SS_DISCONNECTING;
677 return -ECONNREFUSED;
678 }
679
680 peer.ref = msg_origport(msg);
681 peer.node = msg_orignode(msg);
682 tipc_connect2port(tsock->p->ref, &peer);
683 tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
684 sock->state = SS_CONNECTED;
685 return 0;
686}
687
688/**
689 * set_orig_addr - capture sender's address for received message
690 * @m: descriptor for message info
691 * @msg: received message header
692 *
693 * Note: Address is not captured if not requested by receiver.
694 */
695
696static inline void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
697{
698 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
699
700 if (addr) {
701 addr->family = AF_TIPC;
702 addr->addrtype = TIPC_ADDR_ID;
703 addr->addr.id.ref = msg_origport(msg);
704 addr->addr.id.node = msg_orignode(msg);
705 addr->addr.name.domain = 0; /* could leave uninitialized */
706 addr->scope = 0; /* could leave uninitialized */
707 m->msg_namelen = sizeof(struct sockaddr_tipc);
708 }
709}
710
711/**
712 * anc_data_recv - optionally capture ancillary data for received message
713 * @m: descriptor for message info
714 * @msg: received message header
715 * @tport: TIPC port associated with message
716 *
717 * Note: Ancillary data is not captured if not requested by receiver.
718 *
719 * Returns 0 if successful, otherwise errno
720 */
721
722static inline int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
723 struct tipc_port *tport)
724{
725 u32 anc_data[3];
726 u32 err;
727 u32 dest_type;
728 int res;
729
730 if (likely(m->msg_controllen == 0))
731 return 0;
732
733 /* Optionally capture errored message object(s) */
734
735 err = msg ? msg_errcode(msg) : 0;
736 if (unlikely(err)) {
737 anc_data[0] = err;
738 anc_data[1] = msg_data_sz(msg);
739 if ((res = put_cmsg(m, SOL_SOCKET, TIPC_ERRINFO, 8, anc_data)))
740 return res;
741 if (anc_data[1] &&
742 (res = put_cmsg(m, SOL_SOCKET, TIPC_RETDATA, anc_data[1],
743 msg_data(msg))))
744 return res;
745 }
746
747 /* Optionally capture message destination object */
748
749 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
750 switch (dest_type) {
751 case TIPC_NAMED_MSG:
752 anc_data[0] = msg_nametype(msg);
753 anc_data[1] = msg_namelower(msg);
754 anc_data[2] = msg_namelower(msg);
755 break;
756 case TIPC_MCAST_MSG:
757 anc_data[0] = msg_nametype(msg);
758 anc_data[1] = msg_namelower(msg);
759 anc_data[2] = msg_nameupper(msg);
760 break;
761 case TIPC_CONN_MSG:
762 anc_data[0] = tport->conn_type;
763 anc_data[1] = tport->conn_instance;
764 anc_data[2] = tport->conn_instance;
765 break;
766 default:
767 anc_data[0] = 0;
768 }
769 if (anc_data[0] &&
770 (res = put_cmsg(m, SOL_SOCKET, TIPC_DESTNAME, 12, anc_data)))
771 return res;
772
773 return 0;
774}
775
776/**
777 * recv_msg - receive packet-oriented message
778 * @iocb: (unused)
779 * @m: descriptor for message info
780 * @buf_len: total size of user buffer area
781 * @flags: receive flags
782 *
783 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
784 * If the complete message doesn't fit in user area, truncate it.
785 *
786 * Returns size of returned message data, errno otherwise
787 */
788
789static int recv_msg(struct kiocb *iocb, struct socket *sock,
790 struct msghdr *m, size_t buf_len, int flags)
791{
792 struct tipc_sock *tsock = tipc_sk(sock->sk);
793 struct sk_buff *buf;
794 struct tipc_msg *msg;
795 unsigned int q_len;
796 unsigned int sz;
797 u32 err;
798 int res;
799
800 /* Currently doesn't support receiving into multiple iovec entries */
801
802 if (m->msg_iovlen != 1)
803 return -EOPNOTSUPP;
804
805 /* Catch invalid receive attempts */
806
807 if (unlikely(!buf_len))
808 return -EINVAL;
809
810 if (sock->type == SOCK_SEQPACKET) {
811 if (unlikely(sock->state == SS_UNCONNECTED))
812 return -ENOTCONN;
813 if (unlikely((sock->state == SS_DISCONNECTING) &&
814 (skb_queue_len(&sock->sk->sk_receive_queue) == 0)))
815 return -ENOTCONN;
816 }
817
818 /* Look for a message in receive queue; wait if necessary */
819
820 if (unlikely(down_interruptible(&tsock->sem)))
821 return -ERESTARTSYS;
822
823restart:
824 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
825 (flags & MSG_DONTWAIT))) {
826 res = -EWOULDBLOCK;
827 goto exit;
828 }
829
830 if ((res = wait_event_interruptible(
831 *sock->sk->sk_sleep,
832 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
833 (sock->state == SS_DISCONNECTING))) )) {
834 goto exit;
835 }
836
837 /* Catch attempt to receive on an already terminated connection */
838 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */
839
840 if (!q_len) {
841 res = -ENOTCONN;
842 goto exit;
843 }
844
845 /* Get access to first message in receive queue */
846
847 buf = skb_peek(&sock->sk->sk_receive_queue);
848 msg = buf_msg(buf);
849 sz = msg_data_sz(msg);
850 err = msg_errcode(msg);
851
852 /* Complete connection setup for an implied connect */
853
854 if (unlikely(sock->state == SS_CONNECTING)) {
855 if ((res = auto_connect(sock, tsock, msg)))
856 goto exit;
857 }
858
859 /* Discard an empty non-errored message & try again */
860
861 if ((!sz) && (!err)) {
862 advance_queue(tsock);
863 goto restart;
864 }
865
866 /* Capture sender's address (optional) */
867
868 set_orig_addr(m, msg);
869
870 /* Capture ancillary data (optional) */
871
872 if ((res = anc_data_recv(m, msg, tsock->p)))
873 goto exit;
874
875 /* Capture message data (if valid) & compute return value (always) */
876
877 if (!err) {
878 if (unlikely(buf_len < sz)) {
879 sz = buf_len;
880 m->msg_flags |= MSG_TRUNC;
881 }
882 if (unlikely(copy_to_user(m->msg_iov->iov_base, msg_data(msg),
883 sz))) {
884 res = -EFAULT;
885 goto exit;
886 }
887 res = sz;
888 } else {
889 if ((sock->state == SS_READY) ||
890 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
891 res = 0;
892 else
893 res = -ECONNRESET;
894 }
895
896 /* Consume received message (optional) */
897
898 if (likely(!(flags & MSG_PEEK))) {
899 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
900 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
901 advance_queue(tsock);
902 }
903exit:
904 up(&tsock->sem);
905 return res;
906}
907
908/**
909 * recv_stream - receive stream-oriented data
910 * @iocb: (unused)
911 * @m: descriptor for message info
912 * @buf_len: total size of user buffer area
913 * @flags: receive flags
914 *
915 * Used for SOCK_STREAM messages only. If not enough data is available
916 * will optionally wait for more; never truncates data.
917 *
918 * Returns size of returned message data, errno otherwise
919 */
920
921static int recv_stream(struct kiocb *iocb, struct socket *sock,
922 struct msghdr *m, size_t buf_len, int flags)
923{
924 struct tipc_sock *tsock = tipc_sk(sock->sk);
925 struct sk_buff *buf;
926 struct tipc_msg *msg;
927 unsigned int q_len;
928 unsigned int sz;
929 int sz_to_copy;
930 int sz_copied = 0;
931 int needed;
932 char *crs = m->msg_iov->iov_base;
933 unsigned char *buf_crs;
934 u32 err;
935 int res;
936
937 /* Currently doesn't support receiving into multiple iovec entries */
938
939 if (m->msg_iovlen != 1)
940 return -EOPNOTSUPP;
941
942 /* Catch invalid receive attempts */
943
944 if (unlikely(!buf_len))
945 return -EINVAL;
946
947 if (unlikely(sock->state == SS_DISCONNECTING)) {
948 if (skb_queue_len(&sock->sk->sk_receive_queue) == 0)
949 return -ENOTCONN;
950 } else if (unlikely(sock->state != SS_CONNECTED))
951 return -ENOTCONN;
952
953 /* Look for a message in receive queue; wait if necessary */
954
955 if (unlikely(down_interruptible(&tsock->sem)))
956 return -ERESTARTSYS;
957
958restart:
959 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
960 (flags & MSG_DONTWAIT))) {
961 res = (sz_copied == 0) ? -EWOULDBLOCK : 0;
962 goto exit;
963 }
964
965 if ((res = wait_event_interruptible(
966 *sock->sk->sk_sleep,
967 ((q_len = skb_queue_len(&sock->sk->sk_receive_queue)) ||
968 (sock->state == SS_DISCONNECTING))) )) {
969 goto exit;
970 }
971
972 /* Catch attempt to receive on an already terminated connection */
973 /* [THIS CHECK MAY OVERLAP WITH AN EARLIER CHECK] */
974
975 if (!q_len) {
976 res = -ENOTCONN;
977 goto exit;
978 }
979
980 /* Get access to first message in receive queue */
981
982 buf = skb_peek(&sock->sk->sk_receive_queue);
983 msg = buf_msg(buf);
984 sz = msg_data_sz(msg);
985 err = msg_errcode(msg);
986
987 /* Discard an empty non-errored message & try again */
988
989 if ((!sz) && (!err)) {
990 advance_queue(tsock);
991 goto restart;
992 }
993
994 /* Optionally capture sender's address & ancillary data of first msg */
995
996 if (sz_copied == 0) {
997 set_orig_addr(m, msg);
998 if ((res = anc_data_recv(m, msg, tsock->p)))
999 goto exit;
1000 }
1001
1002 /* Capture message data (if valid) & compute return value (always) */
1003
1004 if (!err) {
1005 buf_crs = (unsigned char *)(TIPC_SKB_CB(buf)->handle);
1006 sz = buf->tail - buf_crs;
1007
1008 needed = (buf_len - sz_copied);
1009 sz_to_copy = (sz <= needed) ? sz : needed;
1010 if (unlikely(copy_to_user(crs, buf_crs, sz_to_copy))) {
1011 res = -EFAULT;
1012 goto exit;
1013 }
1014 sz_copied += sz_to_copy;
1015
1016 if (sz_to_copy < sz) {
1017 if (!(flags & MSG_PEEK))
1018 TIPC_SKB_CB(buf)->handle = buf_crs + sz_to_copy;
1019 goto exit;
1020 }
1021
1022 crs += sz_to_copy;
1023 } else {
1024 if (sz_copied != 0)
1025 goto exit; /* can't add error msg to valid data */
1026
1027 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1028 res = 0;
1029 else
1030 res = -ECONNRESET;
1031 }
1032
1033 /* Consume received message (optional) */
1034
1035 if (likely(!(flags & MSG_PEEK))) {
1036 if (unlikely(++tsock->p->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1037 tipc_acknowledge(tsock->p->ref, tsock->p->conn_unacked);
1038 advance_queue(tsock);
1039 }
1040
1041 /* Loop around if more data is required */
1042
1043 if ((sz_copied < buf_len) /* didn't get all requested data */
1044 && (flags & MSG_WAITALL) /* ... and need to wait for more */
1045 && (!(flags & MSG_PEEK)) /* ... and aren't just peeking at data */
1046 && (!err) /* ... and haven't reached a FIN */
1047 )
1048 goto restart;
1049
1050exit:
1051 up(&tsock->sem);
1052 return res ? res : sz_copied;
1053}
1054
1055/**
1056 * queue_overloaded - test if queue overload condition exists
1057 * @queue_size: current size of queue
1058 * @base: nominal maximum size of queue
1059 * @msg: message to be added to queue
1060 *
1061 * Returns 1 if queue is currently overloaded, 0 otherwise
1062 */
1063
1064static int queue_overloaded(u32 queue_size, u32 base, struct tipc_msg *msg)
1065{
1066 u32 threshold;
1067 u32 imp = msg_importance(msg);
1068
1069 if (imp == TIPC_LOW_IMPORTANCE)
1070 threshold = base;
1071 else if (imp == TIPC_MEDIUM_IMPORTANCE)
1072 threshold = base * 2;
1073 else if (imp == TIPC_HIGH_IMPORTANCE)
1074 threshold = base * 100;
1075 else
1076 return 0;
1077
1078 if (msg_connected(msg))
1079 threshold *= 4;
1080
1081 return (queue_size > threshold);
1082}
1083
1084/**
1085 * async_disconnect - wrapper function used to disconnect port
1086 * @portref: TIPC port reference (passed as pointer-sized value)
1087 */
1088
1089static void async_disconnect(unsigned long portref)
1090{
1091 tipc_disconnect((u32)portref);
1092}
1093
1094/**
1095 * dispatch - handle arriving message
1096 * @tport: TIPC port that received message
1097 * @buf: message
1098 *
1099 * Called with port locked. Must not take socket lock to avoid deadlock risk.
1100 *
1101 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1102 */
1103
1104static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1105{
1106 struct tipc_msg *msg = buf_msg(buf);
1107 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle;
1108 struct socket *sock;
1109 u32 recv_q_len;
1110
1111 /* Reject message if socket is closing */
1112
1113 if (!tsock)
1114 return TIPC_ERR_NO_PORT;
1115
1116 /* Reject message if it is wrong sort of message for socket */
1117
1118 /*
1119 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
1120 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
1121 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
1122 */
1123 sock = tsock->sk.sk_socket;
1124 if (sock->state == SS_READY) {
1125 if (msg_connected(msg)) {
1126 msg_dbg(msg, "dispatch filter 1\n");
1127 return TIPC_ERR_NO_PORT;
1128 }
1129 } else {
1130 if (msg_mcast(msg)) {
1131 msg_dbg(msg, "dispatch filter 2\n");
1132 return TIPC_ERR_NO_PORT;
1133 }
1134 if (sock->state == SS_CONNECTED) {
1135 if (!msg_connected(msg)) {
1136 msg_dbg(msg, "dispatch filter 3\n");
1137 return TIPC_ERR_NO_PORT;
1138 }
1139 }
1140 else if (sock->state == SS_CONNECTING) {
1141 if (!msg_connected(msg) && (msg_errcode(msg) == 0)) {
1142 msg_dbg(msg, "dispatch filter 4\n");
1143 return TIPC_ERR_NO_PORT;
1144 }
1145 }
1146 else if (sock->state == SS_LISTENING) {
1147 if (msg_connected(msg) || msg_errcode(msg)) {
1148 msg_dbg(msg, "dispatch filter 5\n");
1149 return TIPC_ERR_NO_PORT;
1150 }
1151 }
1152 else if (sock->state == SS_DISCONNECTING) {
1153 msg_dbg(msg, "dispatch filter 6\n");
1154 return TIPC_ERR_NO_PORT;
1155 }
1156 else /* (sock->state == SS_UNCONNECTED) */ {
1157 if (msg_connected(msg) || msg_errcode(msg)) {
1158 msg_dbg(msg, "dispatch filter 7\n");
1159 return TIPC_ERR_NO_PORT;
1160 }
1161 }
1162 }
1163
1164 /* Reject message if there isn't room to queue it */
1165
1166 if (unlikely((u32)atomic_read(&tipc_queue_size) >
1167 OVERLOAD_LIMIT_BASE)) {
1168 if (queue_overloaded(atomic_read(&tipc_queue_size),
1169 OVERLOAD_LIMIT_BASE, msg))
1170 return TIPC_ERR_OVERLOAD;
1171 }
1172 recv_q_len = skb_queue_len(&tsock->sk.sk_receive_queue);
1173 if (unlikely(recv_q_len > (OVERLOAD_LIMIT_BASE / 2))) {
1174 if (queue_overloaded(recv_q_len,
1175 OVERLOAD_LIMIT_BASE / 2, msg))
1176 return TIPC_ERR_OVERLOAD;
1177 }
1178
1179 /* Initiate connection termination for an incoming 'FIN' */
1180
1181 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
1182 sock->state = SS_DISCONNECTING;
1183 /* Note: Use signal since port lock is already taken! */
1184 k_signal((Handler)async_disconnect, tport->ref);
1185 }
1186
1187 /* Enqueue message (finally!) */
1188
1189 msg_dbg(msg,"<DISP<: ");
1190 TIPC_SKB_CB(buf)->handle = msg_data(msg);
1191 atomic_inc(&tipc_queue_size);
1192 skb_queue_tail(&sock->sk->sk_receive_queue, buf);
1193
1194 wake_up_interruptible(sock->sk->sk_sleep);
1195 return TIPC_OK;
1196}
1197
1198/**
1199 * wakeupdispatch - wake up port after congestion
1200 * @tport: port to wakeup
1201 *
1202 * Called with port lock on.
1203 */
1204
1205static void wakeupdispatch(struct tipc_port *tport)
1206{
1207 struct tipc_sock *tsock = (struct tipc_sock *)tport->usr_handle;
1208
1209 wake_up_interruptible(tsock->sk.sk_sleep);
1210}
1211
1212/**
1213 * connect - establish a connection to another TIPC port
1214 * @sock: socket structure
1215 * @dest: socket address for destination port
1216 * @destlen: size of socket address data structure
1217 * @flags: (unused)
1218 *
1219 * Returns 0 on success, errno otherwise
1220 */
1221
1222static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
1223 int flags)
1224{
1225 struct tipc_sock *tsock = tipc_sk(sock->sk);
1226 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1227 struct msghdr m = {0,};
1228 struct sk_buff *buf;
1229 struct tipc_msg *msg;
1230 int res;
1231
1232 /* For now, TIPC does not allow use of connect() with DGRAM or RDM types */
1233
1234 if (sock->state == SS_READY)
1235 return -EOPNOTSUPP;
1236
1237 /* MOVE THE REST OF THIS ERROR CHECKING TO send_msg()? */
1238 if (sock->state == SS_LISTENING)
1239 return -EOPNOTSUPP;
1240 if (sock->state == SS_CONNECTING)
1241 return -EALREADY;
1242 if (sock->state != SS_UNCONNECTED)
1243 return -EISCONN;
1244
1245 if ((dst->family != AF_TIPC) ||
1246 ((dst->addrtype != TIPC_ADDR_NAME) && (dst->addrtype != TIPC_ADDR_ID)))
1247 return -EINVAL;
1248
1249 /* Send a 'SYN-' to destination */
1250
1251 m.msg_name = dest;
1252 if ((res = send_msg(0, sock, &m, 0)) < 0) {
1253 sock->state = SS_DISCONNECTING;
1254 return res;
1255 }
1256
1257 if (down_interruptible(&tsock->sem))
1258 return -ERESTARTSYS;
1259
1260 /* Wait for destination's 'ACK' response */
1261
1262 res = wait_event_interruptible_timeout(*sock->sk->sk_sleep,
1263 skb_queue_len(&sock->sk->sk_receive_queue),
1264 sock->sk->sk_rcvtimeo);
1265 buf = skb_peek(&sock->sk->sk_receive_queue);
1266 if (res > 0) {
1267 msg = buf_msg(buf);
1268 res = auto_connect(sock, tsock, msg);
1269 if (!res) {
1270 if (dst->addrtype == TIPC_ADDR_NAME) {
1271 tsock->p->conn_type = dst->addr.name.name.type;
1272 tsock->p->conn_instance = dst->addr.name.name.instance;
1273 }
1274 if (!msg_data_sz(msg))
1275 advance_queue(tsock);
1276 }
1277 } else {
1278 if (res == 0) {
1279 res = -ETIMEDOUT;
1280 } else
1281 { /* leave "res" unchanged */ }
1282 sock->state = SS_DISCONNECTING;
1283 }
1284
1285 up(&tsock->sem);
1286 return res;
1287}
1288
1289/**
1290 * listen - allow socket to listen for incoming connections
1291 * @sock: socket structure
1292 * @len: (unused)
1293 *
1294 * Returns 0 on success, errno otherwise
1295 */
1296
1297static int listen(struct socket *sock, int len)
1298{
1299 /* REQUIRES SOCKET LOCKING OF SOME SORT? */
1300
1301 if (sock->state == SS_READY)
1302 return -EOPNOTSUPP;
1303 if (sock->state != SS_UNCONNECTED)
1304 return -EINVAL;
1305 sock->state = SS_LISTENING;
1306 return 0;
1307}
1308
1309/**
1310 * accept - wait for connection request
1311 * @sock: listening socket
1312 * @newsock: new socket that is to be connected
1313 * @flags: file-related flags associated with socket
1314 *
1315 * Returns 0 on success, errno otherwise
1316 */
1317
1318static int accept(struct socket *sock, struct socket *newsock, int flags)
1319{
1320 struct tipc_sock *tsock = tipc_sk(sock->sk);
1321 struct sk_buff *buf;
1322 int res = -EFAULT;
1323
1324 if (sock->state == SS_READY)
1325 return -EOPNOTSUPP;
1326 if (sock->state != SS_LISTENING)
1327 return -EINVAL;
1328
1329 if (unlikely((skb_queue_len(&sock->sk->sk_receive_queue) == 0) &&
1330 (flags & O_NONBLOCK)))
1331 return -EWOULDBLOCK;
1332
1333 if (down_interruptible(&tsock->sem))
1334 return -ERESTARTSYS;
1335
1336 if (wait_event_interruptible(*sock->sk->sk_sleep,
1337 skb_queue_len(&sock->sk->sk_receive_queue))) {
1338 res = -ERESTARTSYS;
1339 goto exit;
1340 }
1341 buf = skb_peek(&sock->sk->sk_receive_queue);
1342
1343 res = tipc_create(newsock, 0);
1344 if (!res) {
1345 struct tipc_sock *new_tsock = tipc_sk(newsock->sk);
1346 struct tipc_portid id;
1347 struct tipc_msg *msg = buf_msg(buf);
1348 u32 new_ref = new_tsock->p->ref;
1349
1350 id.ref = msg_origport(msg);
1351 id.node = msg_orignode(msg);
1352 tipc_connect2port(new_ref, &id);
1353 newsock->state = SS_CONNECTED;
1354
1355 tipc_set_portimportance(new_ref, msg_importance(msg));
1356 if (msg_named(msg)) {
1357 new_tsock->p->conn_type = msg_nametype(msg);
1358 new_tsock->p->conn_instance = msg_nameinst(msg);
1359 }
1360
1361 /*
1362 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1363 * Respond to 'SYN+' by queuing it on new socket.
1364 */
1365
1366 msg_dbg(msg,"<ACC<: ");
1367 if (!msg_data_sz(msg)) {
1368 struct msghdr m = {0,};
1369
1370 send_packet(0, newsock, &m, 0);
1371 advance_queue(tsock);
1372 } else {
1373 sock_lock(tsock);
1374 skb_dequeue(&sock->sk->sk_receive_queue);
1375 sock_unlock(tsock);
1376 skb_queue_head(&newsock->sk->sk_receive_queue, buf);
1377 }
1378 }
1379exit:
1380 up(&tsock->sem);
1381 return res;
1382}
1383
1384/**
1385 * shutdown - shutdown socket connection
1386 * @sock: socket structure
1387 * @how: direction to close (always treated as read + write)
1388 *
1389 * Terminates connection (if necessary), then purges socket's receive queue.
1390 *
1391 * Returns 0 on success, errno otherwise
1392 */
1393
1394static int shutdown(struct socket *sock, int how)
1395{
1396 struct tipc_sock* tsock = tipc_sk(sock->sk);
1397 struct sk_buff *buf;
1398 int res;
1399
1400 /* Could return -EINVAL for an invalid "how", but why bother? */
1401
1402 if (down_interruptible(&tsock->sem))
1403 return -ERESTARTSYS;
1404
1405 sock_lock(tsock);
1406
1407 switch (sock->state) {
1408 case SS_CONNECTED:
1409
1410 /* Send 'FIN+' or 'FIN-' message to peer */
1411
1412 sock_unlock(tsock);
1413restart:
1414 if ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
1415 atomic_dec(&tipc_queue_size);
1416 if (TIPC_SKB_CB(buf)->handle != msg_data(buf_msg(buf))) {
1417 buf_discard(buf);
1418 goto restart;
1419 }
1420 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1421 }
1422 else {
1423 tipc_shutdown(tsock->p->ref);
1424 }
1425 sock_lock(tsock);
1426
1427 /* fall through */
1428
1429 case SS_DISCONNECTING:
1430
1431 /* Discard any unreceived messages */
1432
1433 while ((buf = skb_dequeue(&sock->sk->sk_receive_queue))) {
1434 atomic_dec(&tipc_queue_size);
1435 buf_discard(buf);
1436 }
1437 tsock->p->conn_unacked = 0;
1438
1439 /* fall through */
1440
1441 case SS_CONNECTING:
1442 sock->state = SS_DISCONNECTING;
1443 res = 0;
1444 break;
1445
1446 default:
1447 res = -ENOTCONN;
1448 }
1449
1450 sock_unlock(tsock);
1451
1452 up(&tsock->sem);
1453 return res;
1454}
1455
1456/**
1457 * setsockopt - set socket option
1458 * @sock: socket structure
1459 * @lvl: option level
1460 * @opt: option identifier
1461 * @ov: pointer to new option value
1462 * @ol: length of option value
1463 *
1464 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1465 * (to ease compatibility).
1466 *
1467 * Returns 0 on success, errno otherwise
1468 */
1469
1470static int setsockopt(struct socket *sock, int lvl, int opt, char *ov, int ol)
1471{
1472 struct tipc_sock *tsock = tipc_sk(sock->sk);
1473 u32 value;
1474 int res;
1475
1476 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1477 return 0;
1478 if (lvl != SOL_TIPC)
1479 return -ENOPROTOOPT;
1480 if (ol < sizeof(value))
1481 return -EINVAL;
1482 if ((res = get_user(value, (u32 *)ov)))
1483 return res;
1484
1485 if (down_interruptible(&tsock->sem))
1486 return -ERESTARTSYS;
1487
1488 switch (opt) {
1489 case TIPC_IMPORTANCE:
1490 res = tipc_set_portimportance(tsock->p->ref, value);
1491 break;
1492 case TIPC_SRC_DROPPABLE:
1493 if (sock->type != SOCK_STREAM)
1494 res = tipc_set_portunreliable(tsock->p->ref, value);
1495 else
1496 res = -ENOPROTOOPT;
1497 break;
1498 case TIPC_DEST_DROPPABLE:
1499 res = tipc_set_portunreturnable(tsock->p->ref, value);
1500 break;
1501 case TIPC_CONN_TIMEOUT:
1502 sock->sk->sk_rcvtimeo = (value * HZ / 1000);
1503 break;
1504 default:
1505 res = -EINVAL;
1506 }
1507
1508 up(&tsock->sem);
1509 return res;
1510}
1511
1512/**
1513 * getsockopt - get socket option
1514 * @sock: socket structure
1515 * @lvl: option level
1516 * @opt: option identifier
1517 * @ov: receptacle for option value
1518 * @ol: receptacle for length of option value
1519 *
1520 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1521 * (to ease compatibility).
1522 *
1523 * Returns 0 on success, errno otherwise
1524 */
1525
1526static int getsockopt(struct socket *sock, int lvl, int opt, char *ov, int *ol)
1527{
1528 struct tipc_sock *tsock = tipc_sk(sock->sk);
1529 int len;
1530 u32 value;
1531 int res;
1532
1533 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1534 return put_user(0, ol);
1535 if (lvl != SOL_TIPC)
1536 return -ENOPROTOOPT;
1537 if ((res = get_user(len, ol)))
1538 return res;
1539
1540 if (down_interruptible(&tsock->sem))
1541 return -ERESTARTSYS;
1542
1543 switch (opt) {
1544 case TIPC_IMPORTANCE:
1545 res = tipc_portimportance(tsock->p->ref, &value);
1546 break;
1547 case TIPC_SRC_DROPPABLE:
1548 res = tipc_portunreliable(tsock->p->ref, &value);
1549 break;
1550 case TIPC_DEST_DROPPABLE:
1551 res = tipc_portunreturnable(tsock->p->ref, &value);
1552 break;
1553 case TIPC_CONN_TIMEOUT:
1554 value = (sock->sk->sk_rcvtimeo * 1000) / HZ;
1555 break;
1556 default:
1557 res = -EINVAL;
1558 }
1559
1560 if (res) {
1561 /* "get" failed */
1562 }
1563 else if (len < sizeof(value)) {
1564 res = -EINVAL;
1565 }
1566 else if ((res = copy_to_user(ov, &value, sizeof(value)))) {
1567 /* couldn't return value */
1568 }
1569 else {
1570 res = put_user(sizeof(value), ol);
1571 }
1572
1573 up(&tsock->sem);
1574 return res;
1575}
1576
1577/**
1578 * Placeholders for non-implemented functionality
1579 *
1580 * Returns error code (POSIX-compliant where defined)
1581 */
1582
1583static int ioctl(struct socket *s, u32 cmd, unsigned long arg)
1584{
1585 return -EINVAL;
1586}
1587
1588static int no_mmap(struct file *file, struct socket *sock,
1589 struct vm_area_struct *vma)
1590{
1591 return -EINVAL;
1592}
1593static ssize_t no_sendpage(struct socket *sock, struct page *page,
1594 int offset, size_t size, int flags)
1595{
1596 return -EINVAL;
1597}
1598
1599static int no_skpair(struct socket *s1, struct socket *s2)
1600{
1601 return -EOPNOTSUPP;
1602}
1603
1604/**
1605 * Protocol switches for the various types of TIPC sockets
1606 */
1607
1608static struct proto_ops msg_ops = {
1609 .owner = THIS_MODULE,
1610 .family = AF_TIPC,
1611 .release = release,
1612 .bind = bind,
1613 .connect = connect,
1614 .socketpair = no_skpair,
1615 .accept = accept,
1616 .getname = get_name,
1617 .poll = poll,
1618 .ioctl = ioctl,
1619 .listen = listen,
1620 .shutdown = shutdown,
1621 .setsockopt = setsockopt,
1622 .getsockopt = getsockopt,
1623 .sendmsg = send_msg,
1624 .recvmsg = recv_msg,
1625 .mmap = no_mmap,
1626 .sendpage = no_sendpage
1627};
1628
1629static struct proto_ops packet_ops = {
1630 .owner = THIS_MODULE,
1631 .family = AF_TIPC,
1632 .release = release,
1633 .bind = bind,
1634 .connect = connect,
1635 .socketpair = no_skpair,
1636 .accept = accept,
1637 .getname = get_name,
1638 .poll = poll,
1639 .ioctl = ioctl,
1640 .listen = listen,
1641 .shutdown = shutdown,
1642 .setsockopt = setsockopt,
1643 .getsockopt = getsockopt,
1644 .sendmsg = send_packet,
1645 .recvmsg = recv_msg,
1646 .mmap = no_mmap,
1647 .sendpage = no_sendpage
1648};
1649
1650static struct proto_ops stream_ops = {
1651 .owner = THIS_MODULE,
1652 .family = AF_TIPC,
1653 .release = release,
1654 .bind = bind,
1655 .connect = connect,
1656 .socketpair = no_skpair,
1657 .accept = accept,
1658 .getname = get_name,
1659 .poll = poll,
1660 .ioctl = ioctl,
1661 .listen = listen,
1662 .shutdown = shutdown,
1663 .setsockopt = setsockopt,
1664 .getsockopt = getsockopt,
1665 .sendmsg = send_stream,
1666 .recvmsg = recv_stream,
1667 .mmap = no_mmap,
1668 .sendpage = no_sendpage
1669};
1670
1671static struct net_proto_family tipc_family_ops = {
1672 .owner = THIS_MODULE,
1673 .family = AF_TIPC,
1674 .create = tipc_create
1675};
1676
1677static struct proto tipc_proto = {
1678 .name = "TIPC",
1679 .owner = THIS_MODULE,
1680 .obj_size = sizeof(struct tipc_sock)
1681};
1682
1683/**
1684 * socket_init - initialize TIPC socket interface
1685 *
1686 * Returns 0 on success, errno otherwise
1687 */
1688int socket_init(void)
1689{
1690 int res;
1691
1692 res = proto_register(&tipc_proto, 1);
1693 if (res) {
1694 err("Unable to register TIPC protocol type\n");
1695 goto out;
1696 }
1697
1698 res = sock_register(&tipc_family_ops);
1699 if (res) {
1700 err("Unable to register TIPC socket type\n");
1701 proto_unregister(&tipc_proto);
1702 goto out;
1703 }
1704
1705 sockets_enabled = 1;
1706 out:
1707 return res;
1708}
1709
1710/**
1711 * sock_stop - stop TIPC socket interface
1712 */
1713void socket_stop(void)
1714{
1715 if (!sockets_enabled)
1716 return;
1717
1718 sockets_enabled = 0;
1719 sock_unregister(tipc_family_ops.family);
1720 proto_unregister(&tipc_proto);
1721}
1722
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-22 10:36:00 -0500