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1/*
2 * net/tipc/socket.c: TIPC socket API
3 *
4 * Copyright (c) 2001-2007, 2012-2014, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
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.
19 *
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
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include "core.h"
38#include "port.h"
39
40#include <linux/export.h>
41
42#define SS_LISTENING -1 /* socket is listening */
43#define SS_READY -2 /* socket is connectionless */
44
45#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
46
47static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
48static void tipc_data_ready(struct sock *sk);
49static void tipc_write_space(struct sock *sk);
50static int tipc_release(struct socket *sock);
51static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
52
53static const struct proto_ops packet_ops;
54static const struct proto_ops stream_ops;
55static const struct proto_ops msg_ops;
56
57static struct proto tipc_proto;
58static struct proto tipc_proto_kern;
59
60/*
61 * Revised TIPC socket locking policy:
62 *
63 * Most socket operations take the standard socket lock when they start
64 * and hold it until they finish (or until they need to sleep). Acquiring
65 * this lock grants the owner exclusive access to the fields of the socket
66 * data structures, with the exception of the backlog queue. A few socket
67 * operations can be done without taking the socket lock because they only
68 * read socket information that never changes during the life of the socket.
69 *
70 * Socket operations may acquire the lock for the associated TIPC port if they
71 * need to perform an operation on the port. If any routine needs to acquire
72 * both the socket lock and the port lock it must take the socket lock first
73 * to avoid the risk of deadlock.
74 *
75 * The dispatcher handling incoming messages cannot grab the socket lock in
76 * the standard fashion, since invoked it runs at the BH level and cannot block.
77 * Instead, it checks to see if the socket lock is currently owned by someone,
78 * and either handles the message itself or adds it to the socket's backlog
79 * queue; in the latter case the queued message is processed once the process
80 * owning the socket lock releases it.
81 *
82 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
83 * the problem of a blocked socket operation preventing any other operations
84 * from occurring. However, applications must be careful if they have
85 * multiple threads trying to send (or receive) on the same socket, as these
86 * operations might interfere with each other. For example, doing a connect
87 * and a receive at the same time might allow the receive to consume the
88 * ACK message meant for the connect. While additional work could be done
89 * to try and overcome this, it doesn't seem to be worthwhile at the present.
90 *
91 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
92 * that another operation that must be performed in a non-blocking manner is
93 * not delayed for very long because the lock has already been taken.
94 *
95 * NOTE: This code assumes that certain fields of a port/socket pair are
96 * constant over its lifetime; such fields can be examined without taking
97 * the socket lock and/or port lock, and do not need to be re-read even
98 * after resuming processing after waiting. These fields include:
99 * - socket type
100 * - pointer to socket sk structure (aka tipc_sock structure)
101 * - pointer to port structure
102 * - port reference
103 */
104
105#include "socket.h"
106
107/**
108 * advance_rx_queue - discard first buffer in socket receive queue
109 *
110 * Caller must hold socket lock
111 */
112static void advance_rx_queue(struct sock *sk)
113{
114 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
115}
116
117/**
118 * reject_rx_queue - reject all buffers in socket receive queue
119 *
120 * Caller must hold socket lock
121 */
122static void reject_rx_queue(struct sock *sk)
123{
124 struct sk_buff *buf;
125
126 while ((buf = __skb_dequeue(&sk->sk_receive_queue)))
127 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
128}
129
130/**
131 * tipc_sk_create - create a TIPC socket
132 * @net: network namespace (must be default network)
133 * @sock: pre-allocated socket structure
134 * @protocol: protocol indicator (must be 0)
135 * @kern: caused by kernel or by userspace?
136 *
137 * This routine creates additional data structures used by the TIPC socket,
138 * initializes them, and links them together.
139 *
140 * Returns 0 on success, errno otherwise
141 */
142static int tipc_sk_create(struct net *net, struct socket *sock,
143 int protocol, int kern)
144{
145 const struct proto_ops *ops;
146 socket_state state;
147 struct sock *sk;
148 struct tipc_sock *tsk;
149 struct tipc_port *port;
150 u32 ref;
151
152 /* Validate arguments */
153 if (unlikely(protocol != 0))
154 return -EPROTONOSUPPORT;
155
156 switch (sock->type) {
157 case SOCK_STREAM:
158 ops = &stream_ops;
159 state = SS_UNCONNECTED;
160 break;
161 case SOCK_SEQPACKET:
162 ops = &packet_ops;
163 state = SS_UNCONNECTED;
164 break;
165 case SOCK_DGRAM:
166 case SOCK_RDM:
167 ops = &msg_ops;
168 state = SS_READY;
169 break;
170 default:
171 return -EPROTOTYPE;
172 }
173
174 /* Allocate socket's protocol area */
175 if (!kern)
176 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
177 else
178 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
179
180 if (sk == NULL)
181 return -ENOMEM;
182
183 tsk = tipc_sk(sk);
184 port = &tsk->port;
185
186 ref = tipc_port_init(port, TIPC_LOW_IMPORTANCE);
187 if (!ref) {
188 pr_warn("Socket registration failed, ref. table exhausted\n");
189 sk_free(sk);
190 return -ENOMEM;
191 }
192
193 /* Finish initializing socket data structures */
194 sock->ops = ops;
195 sock->state = state;
196
197 sock_init_data(sock, sk);
198 sk->sk_backlog_rcv = backlog_rcv;
199 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
200 sk->sk_data_ready = tipc_data_ready;
201 sk->sk_write_space = tipc_write_space;
202 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
203 tipc_port_unlock(port);
204
205 if (sock->state == SS_READY) {
206 tipc_port_set_unreturnable(port, true);
207 if (sock->type == SOCK_DGRAM)
208 tipc_port_set_unreliable(port, true);
209 }
210 return 0;
211}
212
213/**
214 * tipc_sock_create_local - create TIPC socket from inside TIPC module
215 * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
216 *
217 * We cannot use sock_creat_kern here because it bumps module user count.
218 * Since socket owner and creator is the same module we must make sure
219 * that module count remains zero for module local sockets, otherwise
220 * we cannot do rmmod.
221 *
222 * Returns 0 on success, errno otherwise
223 */
224int tipc_sock_create_local(int type, struct socket **res)
225{
226 int rc;
227
228 rc = sock_create_lite(AF_TIPC, type, 0, res);
229 if (rc < 0) {
230 pr_err("Failed to create kernel socket\n");
231 return rc;
232 }
233 tipc_sk_create(&init_net, *res, 0, 1);
234
235 return 0;
236}
237
238/**
239 * tipc_sock_release_local - release socket created by tipc_sock_create_local
240 * @sock: the socket to be released.
241 *
242 * Module reference count is not incremented when such sockets are created,
243 * so we must keep it from being decremented when they are released.
244 */
245void tipc_sock_release_local(struct socket *sock)
246{
247 tipc_release(sock);
248 sock->ops = NULL;
249 sock_release(sock);
250}
251
252/**
253 * tipc_sock_accept_local - accept a connection on a socket created
254 * with tipc_sock_create_local. Use this function to avoid that
255 * module reference count is inadvertently incremented.
256 *
257 * @sock: the accepting socket
258 * @newsock: reference to the new socket to be created
259 * @flags: socket flags
260 */
261
262int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
263 int flags)
264{
265 struct sock *sk = sock->sk;
266 int ret;
267
268 ret = sock_create_lite(sk->sk_family, sk->sk_type,
269 sk->sk_protocol, newsock);
270 if (ret < 0)
271 return ret;
272
273 ret = tipc_accept(sock, *newsock, flags);
274 if (ret < 0) {
275 sock_release(*newsock);
276 return ret;
277 }
278 (*newsock)->ops = sock->ops;
279 return ret;
280}
281
282/**
283 * tipc_release - destroy a TIPC socket
284 * @sock: socket to destroy
285 *
286 * This routine cleans up any messages that are still queued on the socket.
287 * For DGRAM and RDM socket types, all queued messages are rejected.
288 * For SEQPACKET and STREAM socket types, the first message is rejected
289 * and any others are discarded. (If the first message on a STREAM socket
290 * is partially-read, it is discarded and the next one is rejected instead.)
291 *
292 * NOTE: Rejected messages are not necessarily returned to the sender! They
293 * are returned or discarded according to the "destination droppable" setting
294 * specified for the message by the sender.
295 *
296 * Returns 0 on success, errno otherwise
297 */
298static int tipc_release(struct socket *sock)
299{
300 struct sock *sk = sock->sk;
301 struct tipc_sock *tsk;
302 struct tipc_port *port;
303 struct sk_buff *buf;
304
305 /*
306 * Exit if socket isn't fully initialized (occurs when a failed accept()
307 * releases a pre-allocated child socket that was never used)
308 */
309 if (sk == NULL)
310 return 0;
311
312 tsk = tipc_sk(sk);
313 port = &tsk->port;
314 lock_sock(sk);
315
316 /*
317 * Reject all unreceived messages, except on an active connection
318 * (which disconnects locally & sends a 'FIN+' to peer)
319 */
320 while (sock->state != SS_DISCONNECTING) {
321 buf = __skb_dequeue(&sk->sk_receive_queue);
322 if (buf == NULL)
323 break;
324 if (TIPC_SKB_CB(buf)->handle != NULL)
325 kfree_skb(buf);
326 else {
327 if ((sock->state == SS_CONNECTING) ||
328 (sock->state == SS_CONNECTED)) {
329 sock->state = SS_DISCONNECTING;
330 tipc_port_disconnect(port->ref);
331 }
332 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
333 }
334 }
335
336 /* Destroy TIPC port; also disconnects an active connection and
337 * sends a 'FIN-' to peer.
338 */
339 tipc_port_destroy(port);
340
341 /* Discard any remaining (connection-based) messages in receive queue */
342 __skb_queue_purge(&sk->sk_receive_queue);
343
344 /* Reject any messages that accumulated in backlog queue */
345 sock->state = SS_DISCONNECTING;
346 release_sock(sk);
347
348 sock_put(sk);
349 sock->sk = NULL;
350
351 return 0;
352}
353
354/**
355 * tipc_bind - associate or disassocate TIPC name(s) with a socket
356 * @sock: socket structure
357 * @uaddr: socket address describing name(s) and desired operation
358 * @uaddr_len: size of socket address data structure
359 *
360 * Name and name sequence binding is indicated using a positive scope value;
361 * a negative scope value unbinds the specified name. Specifying no name
362 * (i.e. a socket address length of 0) unbinds all names from the socket.
363 *
364 * Returns 0 on success, errno otherwise
365 *
366 * NOTE: This routine doesn't need to take the socket lock since it doesn't
367 * access any non-constant socket information.
368 */
369static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
370 int uaddr_len)
371{
372 struct sock *sk = sock->sk;
373 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
374 struct tipc_sock *tsk = tipc_sk(sk);
375 int res = -EINVAL;
376
377 lock_sock(sk);
378 if (unlikely(!uaddr_len)) {
379 res = tipc_withdraw(&tsk->port, 0, NULL);
380 goto exit;
381 }
382
383 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
384 res = -EINVAL;
385 goto exit;
386 }
387 if (addr->family != AF_TIPC) {
388 res = -EAFNOSUPPORT;
389 goto exit;
390 }
391
392 if (addr->addrtype == TIPC_ADDR_NAME)
393 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
394 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
395 res = -EAFNOSUPPORT;
396 goto exit;
397 }
398
399 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
400 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
401 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
402 res = -EACCES;
403 goto exit;
404 }
405
406 res = (addr->scope > 0) ?
407 tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) :
408 tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq);
409exit:
410 release_sock(sk);
411 return res;
412}
413
414/**
415 * tipc_getname - get port ID of socket or peer socket
416 * @sock: socket structure
417 * @uaddr: area for returned socket address
418 * @uaddr_len: area for returned length of socket address
419 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
420 *
421 * Returns 0 on success, errno otherwise
422 *
423 * NOTE: This routine doesn't need to take the socket lock since it only
424 * accesses socket information that is unchanging (or which changes in
425 * a completely predictable manner).
426 */
427static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
428 int *uaddr_len, int peer)
429{
430 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
431 struct tipc_sock *tsk = tipc_sk(sock->sk);
432
433 memset(addr, 0, sizeof(*addr));
434 if (peer) {
435 if ((sock->state != SS_CONNECTED) &&
436 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
437 return -ENOTCONN;
438 addr->addr.id.ref = tipc_port_peerport(&tsk->port);
439 addr->addr.id.node = tipc_port_peernode(&tsk->port);
440 } else {
441 addr->addr.id.ref = tsk->port.ref;
442 addr->addr.id.node = tipc_own_addr;
443 }
444
445 *uaddr_len = sizeof(*addr);
446 addr->addrtype = TIPC_ADDR_ID;
447 addr->family = AF_TIPC;
448 addr->scope = 0;
449 addr->addr.name.domain = 0;
450
451 return 0;
452}
453
454/**
455 * tipc_poll - read and possibly block on pollmask
456 * @file: file structure associated with the socket
457 * @sock: socket for which to calculate the poll bits
458 * @wait: ???
459 *
460 * Returns pollmask value
461 *
462 * COMMENTARY:
463 * It appears that the usual socket locking mechanisms are not useful here
464 * since the pollmask info is potentially out-of-date the moment this routine
465 * exits. TCP and other protocols seem to rely on higher level poll routines
466 * to handle any preventable race conditions, so TIPC will do the same ...
467 *
468 * TIPC sets the returned events as follows:
469 *
470 * socket state flags set
471 * ------------ ---------
472 * unconnected no read flags
473 * POLLOUT if port is not congested
474 *
475 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
476 * no write flags
477 *
478 * connected POLLIN/POLLRDNORM if data in rx queue
479 * POLLOUT if port is not congested
480 *
481 * disconnecting POLLIN/POLLRDNORM/POLLHUP
482 * no write flags
483 *
484 * listening POLLIN if SYN in rx queue
485 * no write flags
486 *
487 * ready POLLIN/POLLRDNORM if data in rx queue
488 * [connectionless] POLLOUT (since port cannot be congested)
489 *
490 * IMPORTANT: The fact that a read or write operation is indicated does NOT
491 * imply that the operation will succeed, merely that it should be performed
492 * and will not block.
493 */
494static unsigned int tipc_poll(struct file *file, struct socket *sock,
495 poll_table *wait)
496{
497 struct sock *sk = sock->sk;
498 struct tipc_sock *tsk = tipc_sk(sk);
499 u32 mask = 0;
500
501 sock_poll_wait(file, sk_sleep(sk), wait);
502
503 switch ((int)sock->state) {
504 case SS_UNCONNECTED:
505 if (!tsk->port.congested)
506 mask |= POLLOUT;
507 break;
508 case SS_READY:
509 case SS_CONNECTED:
510 if (!tsk->port.congested)
511 mask |= POLLOUT;
512 /* fall thru' */
513 case SS_CONNECTING:
514 case SS_LISTENING:
515 if (!skb_queue_empty(&sk->sk_receive_queue))
516 mask |= (POLLIN | POLLRDNORM);
517 break;
518 case SS_DISCONNECTING:
519 mask = (POLLIN | POLLRDNORM | POLLHUP);
520 break;
521 }
522
523 return mask;
524}
525
526/**
527 * dest_name_check - verify user is permitted to send to specified port name
528 * @dest: destination address
529 * @m: descriptor for message to be sent
530 *
531 * Prevents restricted configuration commands from being issued by
532 * unauthorized users.
533 *
534 * Returns 0 if permission is granted, otherwise errno
535 */
536static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
537{
538 struct tipc_cfg_msg_hdr hdr;
539
540 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
541 return 0;
542 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
543 return 0;
544 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
545 return -EACCES;
546
547 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
548 return -EMSGSIZE;
549 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
550 return -EFAULT;
551 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
552 return -EACCES;
553
554 return 0;
555}
556
557static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
558{
559 struct sock *sk = sock->sk;
560 struct tipc_sock *tsk = tipc_sk(sk);
561 DEFINE_WAIT(wait);
562 int done;
563
564 do {
565 int err = sock_error(sk);
566 if (err)
567 return err;
568 if (sock->state == SS_DISCONNECTING)
569 return -EPIPE;
570 if (!*timeo_p)
571 return -EAGAIN;
572 if (signal_pending(current))
573 return sock_intr_errno(*timeo_p);
574
575 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
576 done = sk_wait_event(sk, timeo_p, !tsk->port.congested);
577 finish_wait(sk_sleep(sk), &wait);
578 } while (!done);
579 return 0;
580}
581
582
583/**
584 * tipc_sendmsg - send message in connectionless manner
585 * @iocb: if NULL, indicates that socket lock is already held
586 * @sock: socket structure
587 * @m: message to send
588 * @total_len: length of message
589 *
590 * Message must have an destination specified explicitly.
591 * Used for SOCK_RDM and SOCK_DGRAM messages,
592 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
593 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
594 *
595 * Returns the number of bytes sent on success, or errno otherwise
596 */
597static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
598 struct msghdr *m, size_t total_len)
599{
600 struct sock *sk = sock->sk;
601 struct tipc_sock *tsk = tipc_sk(sk);
602 struct tipc_port *port = &tsk->port;
603 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
604 int needs_conn;
605 long timeo;
606 int res = -EINVAL;
607
608 if (unlikely(!dest))
609 return -EDESTADDRREQ;
610 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
611 (dest->family != AF_TIPC)))
612 return -EINVAL;
613 if (total_len > TIPC_MAX_USER_MSG_SIZE)
614 return -EMSGSIZE;
615
616 if (iocb)
617 lock_sock(sk);
618
619 needs_conn = (sock->state != SS_READY);
620 if (unlikely(needs_conn)) {
621 if (sock->state == SS_LISTENING) {
622 res = -EPIPE;
623 goto exit;
624 }
625 if (sock->state != SS_UNCONNECTED) {
626 res = -EISCONN;
627 goto exit;
628 }
629 if (tsk->port.published) {
630 res = -EOPNOTSUPP;
631 goto exit;
632 }
633 if (dest->addrtype == TIPC_ADDR_NAME) {
634 tsk->port.conn_type = dest->addr.name.name.type;
635 tsk->port.conn_instance = dest->addr.name.name.instance;
636 }
637
638 /* Abort any pending connection attempts (very unlikely) */
639 reject_rx_queue(sk);
640 }
641
642 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
643 do {
644 if (dest->addrtype == TIPC_ADDR_NAME) {
645 res = dest_name_check(dest, m);
646 if (res)
647 break;
648 res = tipc_send2name(port,
649 &dest->addr.name.name,
650 dest->addr.name.domain,
651 m->msg_iov,
652 total_len);
653 } else if (dest->addrtype == TIPC_ADDR_ID) {
654 res = tipc_send2port(port,
655 &dest->addr.id,
656 m->msg_iov,
657 total_len);
658 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
659 if (needs_conn) {
660 res = -EOPNOTSUPP;
661 break;
662 }
663 res = dest_name_check(dest, m);
664 if (res)
665 break;
666 res = tipc_port_mcast_xmit(port,
667 &dest->addr.nameseq,
668 m->msg_iov,
669 total_len);
670 }
671 if (likely(res != -ELINKCONG)) {
672 if (needs_conn && (res >= 0))
673 sock->state = SS_CONNECTING;
674 break;
675 }
676 res = tipc_wait_for_sndmsg(sock, &timeo);
677 if (res)
678 break;
679 } while (1);
680
681exit:
682 if (iocb)
683 release_sock(sk);
684 return res;
685}
686
687static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
688{
689 struct sock *sk = sock->sk;
690 struct tipc_sock *tsk = tipc_sk(sk);
691 struct tipc_port *port = &tsk->port;
692 DEFINE_WAIT(wait);
693 int done;
694
695 do {
696 int err = sock_error(sk);
697 if (err)
698 return err;
699 if (sock->state == SS_DISCONNECTING)
700 return -EPIPE;
701 else if (sock->state != SS_CONNECTED)
702 return -ENOTCONN;
703 if (!*timeo_p)
704 return -EAGAIN;
705 if (signal_pending(current))
706 return sock_intr_errno(*timeo_p);
707
708 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
709 done = sk_wait_event(sk, timeo_p,
710 (!port->congested || !port->connected));
711 finish_wait(sk_sleep(sk), &wait);
712 } while (!done);
713 return 0;
714}
715
716/**
717 * tipc_send_packet - send a connection-oriented message
718 * @iocb: if NULL, indicates that socket lock is already held
719 * @sock: socket structure
720 * @m: message to send
721 * @total_len: length of message
722 *
723 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
724 *
725 * Returns the number of bytes sent on success, or errno otherwise
726 */
727static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
728 struct msghdr *m, size_t total_len)
729{
730 struct sock *sk = sock->sk;
731 struct tipc_sock *tsk = tipc_sk(sk);
732 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
733 int res = -EINVAL;
734 long timeo;
735
736 /* Handle implied connection establishment */
737 if (unlikely(dest))
738 return tipc_sendmsg(iocb, sock, m, total_len);
739
740 if (total_len > TIPC_MAX_USER_MSG_SIZE)
741 return -EMSGSIZE;
742
743 if (iocb)
744 lock_sock(sk);
745
746 if (unlikely(sock->state != SS_CONNECTED)) {
747 if (sock->state == SS_DISCONNECTING)
748 res = -EPIPE;
749 else
750 res = -ENOTCONN;
751 goto exit;
752 }
753
754 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
755 do {
756 res = tipc_send(&tsk->port, m->msg_iov, total_len);
757 if (likely(res != -ELINKCONG))
758 break;
759 res = tipc_wait_for_sndpkt(sock, &timeo);
760 if (res)
761 break;
762 } while (1);
763exit:
764 if (iocb)
765 release_sock(sk);
766 return res;
767}
768
769/**
770 * tipc_send_stream - send stream-oriented data
771 * @iocb: (unused)
772 * @sock: socket structure
773 * @m: data to send
774 * @total_len: total length of data to be sent
775 *
776 * Used for SOCK_STREAM data.
777 *
778 * Returns the number of bytes sent on success (or partial success),
779 * or errno if no data sent
780 */
781static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
782 struct msghdr *m, size_t total_len)
783{
784 struct sock *sk = sock->sk;
785 struct tipc_sock *tsk = tipc_sk(sk);
786 struct msghdr my_msg;
787 struct iovec my_iov;
788 struct iovec *curr_iov;
789 int curr_iovlen;
790 char __user *curr_start;
791 u32 hdr_size;
792 int curr_left;
793 int bytes_to_send;
794 int bytes_sent;
795 int res;
796
797 lock_sock(sk);
798
799 /* Handle special cases where there is no connection */
800 if (unlikely(sock->state != SS_CONNECTED)) {
801 if (sock->state == SS_UNCONNECTED)
802 res = tipc_send_packet(NULL, sock, m, total_len);
803 else
804 res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN;
805 goto exit;
806 }
807
808 if (unlikely(m->msg_name)) {
809 res = -EISCONN;
810 goto exit;
811 }
812
813 if (total_len > (unsigned int)INT_MAX) {
814 res = -EMSGSIZE;
815 goto exit;
816 }
817
818 /*
819 * Send each iovec entry using one or more messages
820 *
821 * Note: This algorithm is good for the most likely case
822 * (i.e. one large iovec entry), but could be improved to pass sets
823 * of small iovec entries into send_packet().
824 */
825 curr_iov = m->msg_iov;
826 curr_iovlen = m->msg_iovlen;
827 my_msg.msg_iov = &my_iov;
828 my_msg.msg_iovlen = 1;
829 my_msg.msg_flags = m->msg_flags;
830 my_msg.msg_name = NULL;
831 bytes_sent = 0;
832
833 hdr_size = msg_hdr_sz(&tsk->port.phdr);
834
835 while (curr_iovlen--) {
836 curr_start = curr_iov->iov_base;
837 curr_left = curr_iov->iov_len;
838
839 while (curr_left) {
840 bytes_to_send = tsk->port.max_pkt - hdr_size;
841 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
842 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
843 if (curr_left < bytes_to_send)
844 bytes_to_send = curr_left;
845 my_iov.iov_base = curr_start;
846 my_iov.iov_len = bytes_to_send;
847 res = tipc_send_packet(NULL, sock, &my_msg,
848 bytes_to_send);
849 if (res < 0) {
850 if (bytes_sent)
851 res = bytes_sent;
852 goto exit;
853 }
854 curr_left -= bytes_to_send;
855 curr_start += bytes_to_send;
856 bytes_sent += bytes_to_send;
857 }
858
859 curr_iov++;
860 }
861 res = bytes_sent;
862exit:
863 release_sock(sk);
864 return res;
865}
866
867/**
868 * auto_connect - complete connection setup to a remote port
869 * @tsk: tipc socket structure
870 * @msg: peer's response message
871 *
872 * Returns 0 on success, errno otherwise
873 */
874static int auto_connect(struct tipc_sock *tsk, struct tipc_msg *msg)
875{
876 struct tipc_port *port = &tsk->port;
877 struct socket *sock = tsk->sk.sk_socket;
878 struct tipc_portid peer;
879
880 peer.ref = msg_origport(msg);
881 peer.node = msg_orignode(msg);
882
883 __tipc_port_connect(port->ref, port, &peer);
884
885 if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
886 return -EINVAL;
887 msg_set_importance(&port->phdr, (u32)msg_importance(msg));
888 sock->state = SS_CONNECTED;
889 return 0;
890}
891
892/**
893 * set_orig_addr - capture sender's address for received message
894 * @m: descriptor for message info
895 * @msg: received message header
896 *
897 * Note: Address is not captured if not requested by receiver.
898 */
899static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
900{
901 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
902
903 if (addr) {
904 addr->family = AF_TIPC;
905 addr->addrtype = TIPC_ADDR_ID;
906 memset(&addr->addr, 0, sizeof(addr->addr));
907 addr->addr.id.ref = msg_origport(msg);
908 addr->addr.id.node = msg_orignode(msg);
909 addr->addr.name.domain = 0; /* could leave uninitialized */
910 addr->scope = 0; /* could leave uninitialized */
911 m->msg_namelen = sizeof(struct sockaddr_tipc);
912 }
913}
914
915/**
916 * anc_data_recv - optionally capture ancillary data for received message
917 * @m: descriptor for message info
918 * @msg: received message header
919 * @tport: TIPC port associated with message
920 *
921 * Note: Ancillary data is not captured if not requested by receiver.
922 *
923 * Returns 0 if successful, otherwise errno
924 */
925static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
926 struct tipc_port *tport)
927{
928 u32 anc_data[3];
929 u32 err;
930 u32 dest_type;
931 int has_name;
932 int res;
933
934 if (likely(m->msg_controllen == 0))
935 return 0;
936
937 /* Optionally capture errored message object(s) */
938 err = msg ? msg_errcode(msg) : 0;
939 if (unlikely(err)) {
940 anc_data[0] = err;
941 anc_data[1] = msg_data_sz(msg);
942 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
943 if (res)
944 return res;
945 if (anc_data[1]) {
946 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
947 msg_data(msg));
948 if (res)
949 return res;
950 }
951 }
952
953 /* Optionally capture message destination object */
954 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
955 switch (dest_type) {
956 case TIPC_NAMED_MSG:
957 has_name = 1;
958 anc_data[0] = msg_nametype(msg);
959 anc_data[1] = msg_namelower(msg);
960 anc_data[2] = msg_namelower(msg);
961 break;
962 case TIPC_MCAST_MSG:
963 has_name = 1;
964 anc_data[0] = msg_nametype(msg);
965 anc_data[1] = msg_namelower(msg);
966 anc_data[2] = msg_nameupper(msg);
967 break;
968 case TIPC_CONN_MSG:
969 has_name = (tport->conn_type != 0);
970 anc_data[0] = tport->conn_type;
971 anc_data[1] = tport->conn_instance;
972 anc_data[2] = tport->conn_instance;
973 break;
974 default:
975 has_name = 0;
976 }
977 if (has_name) {
978 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
979 if (res)
980 return res;
981 }
982
983 return 0;
984}
985
986static int tipc_wait_for_rcvmsg(struct socket *sock, long timeo)
987{
988 struct sock *sk = sock->sk;
989 DEFINE_WAIT(wait);
990 int err;
991
992 for (;;) {
993 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
994 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
995 if (sock->state == SS_DISCONNECTING) {
996 err = -ENOTCONN;
997 break;
998 }
999 release_sock(sk);
1000 timeo = schedule_timeout(timeo);
1001 lock_sock(sk);
1002 }
1003 err = 0;
1004 if (!skb_queue_empty(&sk->sk_receive_queue))
1005 break;
1006 err = sock_intr_errno(timeo);
1007 if (signal_pending(current))
1008 break;
1009 err = -EAGAIN;
1010 if (!timeo)
1011 break;
1012 }
1013 finish_wait(sk_sleep(sk), &wait);
1014 return err;
1015}
1016
1017/**
1018 * tipc_recvmsg - receive packet-oriented message
1019 * @iocb: (unused)
1020 * @m: descriptor for message info
1021 * @buf_len: total size of user buffer area
1022 * @flags: receive flags
1023 *
1024 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1025 * If the complete message doesn't fit in user area, truncate it.
1026 *
1027 * Returns size of returned message data, errno otherwise
1028 */
1029static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
1030 struct msghdr *m, size_t buf_len, int flags)
1031{
1032 struct sock *sk = sock->sk;
1033 struct tipc_sock *tsk = tipc_sk(sk);
1034 struct tipc_port *port = &tsk->port;
1035 struct sk_buff *buf;
1036 struct tipc_msg *msg;
1037 long timeo;
1038 unsigned int sz;
1039 u32 err;
1040 int res;
1041
1042 /* Catch invalid receive requests */
1043 if (unlikely(!buf_len))
1044 return -EINVAL;
1045
1046 lock_sock(sk);
1047
1048 if (unlikely(sock->state == SS_UNCONNECTED)) {
1049 res = -ENOTCONN;
1050 goto exit;
1051 }
1052
1053 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1054restart:
1055
1056 /* Look for a message in receive queue; wait if necessary */
1057 res = tipc_wait_for_rcvmsg(sock, timeo);
1058 if (res)
1059 goto exit;
1060
1061 /* Look at first message in receive queue */
1062 buf = skb_peek(&sk->sk_receive_queue);
1063 msg = buf_msg(buf);
1064 sz = msg_data_sz(msg);
1065 err = msg_errcode(msg);
1066
1067 /* Discard an empty non-errored message & try again */
1068 if ((!sz) && (!err)) {
1069 advance_rx_queue(sk);
1070 goto restart;
1071 }
1072
1073 /* Capture sender's address (optional) */
1074 set_orig_addr(m, msg);
1075
1076 /* Capture ancillary data (optional) */
1077 res = anc_data_recv(m, msg, port);
1078 if (res)
1079 goto exit;
1080
1081 /* Capture message data (if valid) & compute return value (always) */
1082 if (!err) {
1083 if (unlikely(buf_len < sz)) {
1084 sz = buf_len;
1085 m->msg_flags |= MSG_TRUNC;
1086 }
1087 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
1088 m->msg_iov, sz);
1089 if (res)
1090 goto exit;
1091 res = sz;
1092 } else {
1093 if ((sock->state == SS_READY) ||
1094 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1095 res = 0;
1096 else
1097 res = -ECONNRESET;
1098 }
1099
1100 /* Consume received message (optional) */
1101 if (likely(!(flags & MSG_PEEK))) {
1102 if ((sock->state != SS_READY) &&
1103 (++port->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1104 tipc_acknowledge(port->ref, port->conn_unacked);
1105 advance_rx_queue(sk);
1106 }
1107exit:
1108 release_sock(sk);
1109 return res;
1110}
1111
1112/**
1113 * tipc_recv_stream - receive stream-oriented data
1114 * @iocb: (unused)
1115 * @m: descriptor for message info
1116 * @buf_len: total size of user buffer area
1117 * @flags: receive flags
1118 *
1119 * Used for SOCK_STREAM messages only. If not enough data is available
1120 * will optionally wait for more; never truncates data.
1121 *
1122 * Returns size of returned message data, errno otherwise
1123 */
1124static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
1125 struct msghdr *m, size_t buf_len, int flags)
1126{
1127 struct sock *sk = sock->sk;
1128 struct tipc_sock *tsk = tipc_sk(sk);
1129 struct tipc_port *port = &tsk->port;
1130 struct sk_buff *buf;
1131 struct tipc_msg *msg;
1132 long timeo;
1133 unsigned int sz;
1134 int sz_to_copy, target, needed;
1135 int sz_copied = 0;
1136 u32 err;
1137 int res = 0;
1138
1139 /* Catch invalid receive attempts */
1140 if (unlikely(!buf_len))
1141 return -EINVAL;
1142
1143 lock_sock(sk);
1144
1145 if (unlikely(sock->state == SS_UNCONNECTED)) {
1146 res = -ENOTCONN;
1147 goto exit;
1148 }
1149
1150 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1151 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1152
1153restart:
1154 /* Look for a message in receive queue; wait if necessary */
1155 res = tipc_wait_for_rcvmsg(sock, timeo);
1156 if (res)
1157 goto exit;
1158
1159 /* Look at first message in receive queue */
1160 buf = skb_peek(&sk->sk_receive_queue);
1161 msg = buf_msg(buf);
1162 sz = msg_data_sz(msg);
1163 err = msg_errcode(msg);
1164
1165 /* Discard an empty non-errored message & try again */
1166 if ((!sz) && (!err)) {
1167 advance_rx_queue(sk);
1168 goto restart;
1169 }
1170
1171 /* Optionally capture sender's address & ancillary data of first msg */
1172 if (sz_copied == 0) {
1173 set_orig_addr(m, msg);
1174 res = anc_data_recv(m, msg, port);
1175 if (res)
1176 goto exit;
1177 }
1178
1179 /* Capture message data (if valid) & compute return value (always) */
1180 if (!err) {
1181 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1182
1183 sz -= offset;
1184 needed = (buf_len - sz_copied);
1185 sz_to_copy = (sz <= needed) ? sz : needed;
1186
1187 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1188 m->msg_iov, sz_to_copy);
1189 if (res)
1190 goto exit;
1191
1192 sz_copied += sz_to_copy;
1193
1194 if (sz_to_copy < sz) {
1195 if (!(flags & MSG_PEEK))
1196 TIPC_SKB_CB(buf)->handle =
1197 (void *)(unsigned long)(offset + sz_to_copy);
1198 goto exit;
1199 }
1200 } else {
1201 if (sz_copied != 0)
1202 goto exit; /* can't add error msg to valid data */
1203
1204 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1205 res = 0;
1206 else
1207 res = -ECONNRESET;
1208 }
1209
1210 /* Consume received message (optional) */
1211 if (likely(!(flags & MSG_PEEK))) {
1212 if (unlikely(++port->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1213 tipc_acknowledge(port->ref, port->conn_unacked);
1214 advance_rx_queue(sk);
1215 }
1216
1217 /* Loop around if more data is required */
1218 if ((sz_copied < buf_len) && /* didn't get all requested data */
1219 (!skb_queue_empty(&sk->sk_receive_queue) ||
1220 (sz_copied < target)) && /* and more is ready or required */
1221 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1222 (!err)) /* and haven't reached a FIN */
1223 goto restart;
1224
1225exit:
1226 release_sock(sk);
1227 return sz_copied ? sz_copied : res;
1228}
1229
1230/**
1231 * tipc_write_space - wake up thread if port congestion is released
1232 * @sk: socket
1233 */
1234static void tipc_write_space(struct sock *sk)
1235{
1236 struct socket_wq *wq;
1237
1238 rcu_read_lock();
1239 wq = rcu_dereference(sk->sk_wq);
1240 if (wq_has_sleeper(wq))
1241 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1242 POLLWRNORM | POLLWRBAND);
1243 rcu_read_unlock();
1244}
1245
1246/**
1247 * tipc_data_ready - wake up threads to indicate messages have been received
1248 * @sk: socket
1249 * @len: the length of messages
1250 */
1251static void tipc_data_ready(struct sock *sk)
1252{
1253 struct socket_wq *wq;
1254
1255 rcu_read_lock();
1256 wq = rcu_dereference(sk->sk_wq);
1257 if (wq_has_sleeper(wq))
1258 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1259 POLLRDNORM | POLLRDBAND);
1260 rcu_read_unlock();
1261}
1262
1263/**
1264 * filter_connect - Handle all incoming messages for a connection-based socket
1265 * @tsk: TIPC socket
1266 * @msg: message
1267 *
1268 * Returns TIPC error status code and socket error status code
1269 * once it encounters some errors
1270 */
1271static u32 filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
1272{
1273 struct sock *sk = &tsk->sk;
1274 struct tipc_port *port = &tsk->port;
1275 struct socket *sock = sk->sk_socket;
1276 struct tipc_msg *msg = buf_msg(*buf);
1277
1278 u32 retval = TIPC_ERR_NO_PORT;
1279 int res;
1280
1281 if (msg_mcast(msg))
1282 return retval;
1283
1284 switch ((int)sock->state) {
1285 case SS_CONNECTED:
1286 /* Accept only connection-based messages sent by peer */
1287 if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) {
1288 if (unlikely(msg_errcode(msg))) {
1289 sock->state = SS_DISCONNECTING;
1290 __tipc_port_disconnect(port);
1291 }
1292 retval = TIPC_OK;
1293 }
1294 break;
1295 case SS_CONNECTING:
1296 /* Accept only ACK or NACK message */
1297 if (unlikely(msg_errcode(msg))) {
1298 sock->state = SS_DISCONNECTING;
1299 sk->sk_err = ECONNREFUSED;
1300 retval = TIPC_OK;
1301 break;
1302 }
1303
1304 if (unlikely(!msg_connected(msg)))
1305 break;
1306
1307 res = auto_connect(tsk, msg);
1308 if (res) {
1309 sock->state = SS_DISCONNECTING;
1310 sk->sk_err = -res;
1311 retval = TIPC_OK;
1312 break;
1313 }
1314
1315 /* If an incoming message is an 'ACK-', it should be
1316 * discarded here because it doesn't contain useful
1317 * data. In addition, we should try to wake up
1318 * connect() routine if sleeping.
1319 */
1320 if (msg_data_sz(msg) == 0) {
1321 kfree_skb(*buf);
1322 *buf = NULL;
1323 if (waitqueue_active(sk_sleep(sk)))
1324 wake_up_interruptible(sk_sleep(sk));
1325 }
1326 retval = TIPC_OK;
1327 break;
1328 case SS_LISTENING:
1329 case SS_UNCONNECTED:
1330 /* Accept only SYN message */
1331 if (!msg_connected(msg) && !(msg_errcode(msg)))
1332 retval = TIPC_OK;
1333 break;
1334 case SS_DISCONNECTING:
1335 break;
1336 default:
1337 pr_err("Unknown socket state %u\n", sock->state);
1338 }
1339 return retval;
1340}
1341
1342/**
1343 * rcvbuf_limit - get proper overload limit of socket receive queue
1344 * @sk: socket
1345 * @buf: message
1346 *
1347 * For all connection oriented messages, irrespective of importance,
1348 * the default overload value (i.e. 67MB) is set as limit.
1349 *
1350 * For all connectionless messages, by default new queue limits are
1351 * as belows:
1352 *
1353 * TIPC_LOW_IMPORTANCE (4 MB)
1354 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1355 * TIPC_HIGH_IMPORTANCE (16 MB)
1356 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1357 *
1358 * Returns overload limit according to corresponding message importance
1359 */
1360static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1361{
1362 struct tipc_msg *msg = buf_msg(buf);
1363
1364 if (msg_connected(msg))
1365 return sysctl_tipc_rmem[2];
1366
1367 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1368 msg_importance(msg);
1369}
1370
1371/**
1372 * filter_rcv - validate incoming message
1373 * @sk: socket
1374 * @buf: message
1375 *
1376 * Enqueues message on receive queue if acceptable; optionally handles
1377 * disconnect indication for a connected socket.
1378 *
1379 * Called with socket lock already taken; port lock may also be taken.
1380 *
1381 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1382 */
1383static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
1384{
1385 struct socket *sock = sk->sk_socket;
1386 struct tipc_sock *tsk = tipc_sk(sk);
1387 struct tipc_msg *msg = buf_msg(buf);
1388 unsigned int limit = rcvbuf_limit(sk, buf);
1389 u32 res = TIPC_OK;
1390
1391 /* Reject message if it is wrong sort of message for socket */
1392 if (msg_type(msg) > TIPC_DIRECT_MSG)
1393 return TIPC_ERR_NO_PORT;
1394
1395 if (sock->state == SS_READY) {
1396 if (msg_connected(msg))
1397 return TIPC_ERR_NO_PORT;
1398 } else {
1399 res = filter_connect(tsk, &buf);
1400 if (res != TIPC_OK || buf == NULL)
1401 return res;
1402 }
1403
1404 /* Reject message if there isn't room to queue it */
1405 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1406 return TIPC_ERR_OVERLOAD;
1407
1408 /* Enqueue message */
1409 TIPC_SKB_CB(buf)->handle = NULL;
1410 __skb_queue_tail(&sk->sk_receive_queue, buf);
1411 skb_set_owner_r(buf, sk);
1412
1413 sk->sk_data_ready(sk);
1414 return TIPC_OK;
1415}
1416
1417/**
1418 * backlog_rcv - handle incoming message from backlog queue
1419 * @sk: socket
1420 * @buf: message
1421 *
1422 * Caller must hold socket lock, but not port lock.
1423 *
1424 * Returns 0
1425 */
1426static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1427{
1428 u32 res;
1429
1430 res = filter_rcv(sk, buf);
1431 if (res)
1432 tipc_reject_msg(buf, res);
1433 return 0;
1434}
1435
1436/**
1437 * tipc_sk_rcv - handle incoming message
1438 * @sk: socket receiving message
1439 * @buf: message
1440 *
1441 * Called with port lock already taken.
1442 *
1443 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1444 */
1445u32 tipc_sk_rcv(struct sock *sk, struct sk_buff *buf)
1446{
1447 u32 res;
1448
1449 /*
1450 * Process message if socket is unlocked; otherwise add to backlog queue
1451 *
1452 * This code is based on sk_receive_skb(), but must be distinct from it
1453 * since a TIPC-specific filter/reject mechanism is utilized
1454 */
1455 bh_lock_sock(sk);
1456 if (!sock_owned_by_user(sk)) {
1457 res = filter_rcv(sk, buf);
1458 } else {
1459 if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf)))
1460 res = TIPC_ERR_OVERLOAD;
1461 else
1462 res = TIPC_OK;
1463 }
1464 bh_unlock_sock(sk);
1465
1466 return res;
1467}
1468
1469static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1470{
1471 struct sock *sk = sock->sk;
1472 DEFINE_WAIT(wait);
1473 int done;
1474
1475 do {
1476 int err = sock_error(sk);
1477 if (err)
1478 return err;
1479 if (!*timeo_p)
1480 return -ETIMEDOUT;
1481 if (signal_pending(current))
1482 return sock_intr_errno(*timeo_p);
1483
1484 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1485 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1486 finish_wait(sk_sleep(sk), &wait);
1487 } while (!done);
1488 return 0;
1489}
1490
1491/**
1492 * tipc_connect - establish a connection to another TIPC port
1493 * @sock: socket structure
1494 * @dest: socket address for destination port
1495 * @destlen: size of socket address data structure
1496 * @flags: file-related flags associated with socket
1497 *
1498 * Returns 0 on success, errno otherwise
1499 */
1500static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1501 int destlen, int flags)
1502{
1503 struct sock *sk = sock->sk;
1504 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1505 struct msghdr m = {NULL,};
1506 long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1507 socket_state previous;
1508 int res;
1509
1510 lock_sock(sk);
1511
1512 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1513 if (sock->state == SS_READY) {
1514 res = -EOPNOTSUPP;
1515 goto exit;
1516 }
1517
1518 /*
1519 * Reject connection attempt using multicast address
1520 *
1521 * Note: send_msg() validates the rest of the address fields,
1522 * so there's no need to do it here
1523 */
1524 if (dst->addrtype == TIPC_ADDR_MCAST) {
1525 res = -EINVAL;
1526 goto exit;
1527 }
1528
1529 previous = sock->state;
1530 switch (sock->state) {
1531 case SS_UNCONNECTED:
1532 /* Send a 'SYN-' to destination */
1533 m.msg_name = dest;
1534 m.msg_namelen = destlen;
1535
1536 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1537 * indicate send_msg() is never blocked.
1538 */
1539 if (!timeout)
1540 m.msg_flags = MSG_DONTWAIT;
1541
1542 res = tipc_sendmsg(NULL, sock, &m, 0);
1543 if ((res < 0) && (res != -EWOULDBLOCK))
1544 goto exit;
1545
1546 /* Just entered SS_CONNECTING state; the only
1547 * difference is that return value in non-blocking
1548 * case is EINPROGRESS, rather than EALREADY.
1549 */
1550 res = -EINPROGRESS;
1551 case SS_CONNECTING:
1552 if (previous == SS_CONNECTING)
1553 res = -EALREADY;
1554 if (!timeout)
1555 goto exit;
1556 timeout = msecs_to_jiffies(timeout);
1557 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1558 res = tipc_wait_for_connect(sock, &timeout);
1559 break;
1560 case SS_CONNECTED:
1561 res = -EISCONN;
1562 break;
1563 default:
1564 res = -EINVAL;
1565 break;
1566 }
1567exit:
1568 release_sock(sk);
1569 return res;
1570}
1571
1572/**
1573 * tipc_listen - allow socket to listen for incoming connections
1574 * @sock: socket structure
1575 * @len: (unused)
1576 *
1577 * Returns 0 on success, errno otherwise
1578 */
1579static int tipc_listen(struct socket *sock, int len)
1580{
1581 struct sock *sk = sock->sk;
1582 int res;
1583
1584 lock_sock(sk);
1585
1586 if (sock->state != SS_UNCONNECTED)
1587 res = -EINVAL;
1588 else {
1589 sock->state = SS_LISTENING;
1590 res = 0;
1591 }
1592
1593 release_sock(sk);
1594 return res;
1595}
1596
1597static int tipc_wait_for_accept(struct socket *sock, long timeo)
1598{
1599 struct sock *sk = sock->sk;
1600 DEFINE_WAIT(wait);
1601 int err;
1602
1603 /* True wake-one mechanism for incoming connections: only
1604 * one process gets woken up, not the 'whole herd'.
1605 * Since we do not 'race & poll' for established sockets
1606 * anymore, the common case will execute the loop only once.
1607 */
1608 for (;;) {
1609 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1610 TASK_INTERRUPTIBLE);
1611 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1612 release_sock(sk);
1613 timeo = schedule_timeout(timeo);
1614 lock_sock(sk);
1615 }
1616 err = 0;
1617 if (!skb_queue_empty(&sk->sk_receive_queue))
1618 break;
1619 err = -EINVAL;
1620 if (sock->state != SS_LISTENING)
1621 break;
1622 err = sock_intr_errno(timeo);
1623 if (signal_pending(current))
1624 break;
1625 err = -EAGAIN;
1626 if (!timeo)
1627 break;
1628 }
1629 finish_wait(sk_sleep(sk), &wait);
1630 return err;
1631}
1632
1633/**
1634 * tipc_accept - wait for connection request
1635 * @sock: listening socket
1636 * @newsock: new socket that is to be connected
1637 * @flags: file-related flags associated with socket
1638 *
1639 * Returns 0 on success, errno otherwise
1640 */
1641static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1642{
1643 struct sock *new_sk, *sk = sock->sk;
1644 struct sk_buff *buf;
1645 struct tipc_port *new_port;
1646 struct tipc_msg *msg;
1647 struct tipc_portid peer;
1648 u32 new_ref;
1649 long timeo;
1650 int res;
1651
1652 lock_sock(sk);
1653
1654 if (sock->state != SS_LISTENING) {
1655 res = -EINVAL;
1656 goto exit;
1657 }
1658 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1659 res = tipc_wait_for_accept(sock, timeo);
1660 if (res)
1661 goto exit;
1662
1663 buf = skb_peek(&sk->sk_receive_queue);
1664
1665 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
1666 if (res)
1667 goto exit;
1668
1669 new_sk = new_sock->sk;
1670 new_port = &tipc_sk(new_sk)->port;
1671 new_ref = new_port->ref;
1672 msg = buf_msg(buf);
1673
1674 /* we lock on new_sk; but lockdep sees the lock on sk */
1675 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
1676
1677 /*
1678 * Reject any stray messages received by new socket
1679 * before the socket lock was taken (very, very unlikely)
1680 */
1681 reject_rx_queue(new_sk);
1682
1683 /* Connect new socket to it's peer */
1684 peer.ref = msg_origport(msg);
1685 peer.node = msg_orignode(msg);
1686 tipc_port_connect(new_ref, &peer);
1687 new_sock->state = SS_CONNECTED;
1688
1689 tipc_port_set_importance(new_port, msg_importance(msg));
1690 if (msg_named(msg)) {
1691 new_port->conn_type = msg_nametype(msg);
1692 new_port->conn_instance = msg_nameinst(msg);
1693 }
1694
1695 /*
1696 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1697 * Respond to 'SYN+' by queuing it on new socket.
1698 */
1699 if (!msg_data_sz(msg)) {
1700 struct msghdr m = {NULL,};
1701
1702 advance_rx_queue(sk);
1703 tipc_send_packet(NULL, new_sock, &m, 0);
1704 } else {
1705 __skb_dequeue(&sk->sk_receive_queue);
1706 __skb_queue_head(&new_sk->sk_receive_queue, buf);
1707 skb_set_owner_r(buf, new_sk);
1708 }
1709 release_sock(new_sk);
1710exit:
1711 release_sock(sk);
1712 return res;
1713}
1714
1715/**
1716 * tipc_shutdown - shutdown socket connection
1717 * @sock: socket structure
1718 * @how: direction to close (must be SHUT_RDWR)
1719 *
1720 * Terminates connection (if necessary), then purges socket's receive queue.
1721 *
1722 * Returns 0 on success, errno otherwise
1723 */
1724static int tipc_shutdown(struct socket *sock, int how)
1725{
1726 struct sock *sk = sock->sk;
1727 struct tipc_sock *tsk = tipc_sk(sk);
1728 struct tipc_port *port = &tsk->port;
1729 struct sk_buff *buf;
1730 int res;
1731
1732 if (how != SHUT_RDWR)
1733 return -EINVAL;
1734
1735 lock_sock(sk);
1736
1737 switch (sock->state) {
1738 case SS_CONNECTING:
1739 case SS_CONNECTED:
1740
1741restart:
1742 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1743 buf = __skb_dequeue(&sk->sk_receive_queue);
1744 if (buf) {
1745 if (TIPC_SKB_CB(buf)->handle != NULL) {
1746 kfree_skb(buf);
1747 goto restart;
1748 }
1749 tipc_port_disconnect(port->ref);
1750 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1751 } else {
1752 tipc_port_shutdown(port->ref);
1753 }
1754
1755 sock->state = SS_DISCONNECTING;
1756
1757 /* fall through */
1758
1759 case SS_DISCONNECTING:
1760
1761 /* Discard any unreceived messages */
1762 __skb_queue_purge(&sk->sk_receive_queue);
1763
1764 /* Wake up anyone sleeping in poll */
1765 sk->sk_state_change(sk);
1766 res = 0;
1767 break;
1768
1769 default:
1770 res = -ENOTCONN;
1771 }
1772
1773 release_sock(sk);
1774 return res;
1775}
1776
1777/**
1778 * tipc_setsockopt - set socket option
1779 * @sock: socket structure
1780 * @lvl: option level
1781 * @opt: option identifier
1782 * @ov: pointer to new option value
1783 * @ol: length of option value
1784 *
1785 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1786 * (to ease compatibility).
1787 *
1788 * Returns 0 on success, errno otherwise
1789 */
1790static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
1791 char __user *ov, unsigned int ol)
1792{
1793 struct sock *sk = sock->sk;
1794 struct tipc_sock *tsk = tipc_sk(sk);
1795 struct tipc_port *port = &tsk->port;
1796 u32 value;
1797 int res;
1798
1799 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1800 return 0;
1801 if (lvl != SOL_TIPC)
1802 return -ENOPROTOOPT;
1803 if (ol < sizeof(value))
1804 return -EINVAL;
1805 res = get_user(value, (u32 __user *)ov);
1806 if (res)
1807 return res;
1808
1809 lock_sock(sk);
1810
1811 switch (opt) {
1812 case TIPC_IMPORTANCE:
1813 tipc_port_set_importance(port, value);
1814 break;
1815 case TIPC_SRC_DROPPABLE:
1816 if (sock->type != SOCK_STREAM)
1817 tipc_port_set_unreliable(port, value);
1818 else
1819 res = -ENOPROTOOPT;
1820 break;
1821 case TIPC_DEST_DROPPABLE:
1822 tipc_port_set_unreturnable(port, value);
1823 break;
1824 case TIPC_CONN_TIMEOUT:
1825 tipc_sk(sk)->conn_timeout = value;
1826 /* no need to set "res", since already 0 at this point */
1827 break;
1828 default:
1829 res = -EINVAL;
1830 }
1831
1832 release_sock(sk);
1833
1834 return res;
1835}
1836
1837/**
1838 * tipc_getsockopt - get socket option
1839 * @sock: socket structure
1840 * @lvl: option level
1841 * @opt: option identifier
1842 * @ov: receptacle for option value
1843 * @ol: receptacle for length of option value
1844 *
1845 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1846 * (to ease compatibility).
1847 *
1848 * Returns 0 on success, errno otherwise
1849 */
1850static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
1851 char __user *ov, int __user *ol)
1852{
1853 struct sock *sk = sock->sk;
1854 struct tipc_sock *tsk = tipc_sk(sk);
1855 struct tipc_port *port = &tsk->port;
1856 int len;
1857 u32 value;
1858 int res;
1859
1860 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1861 return put_user(0, ol);
1862 if (lvl != SOL_TIPC)
1863 return -ENOPROTOOPT;
1864 res = get_user(len, ol);
1865 if (res)
1866 return res;
1867
1868 lock_sock(sk);
1869
1870 switch (opt) {
1871 case TIPC_IMPORTANCE:
1872 value = tipc_port_importance(port);
1873 break;
1874 case TIPC_SRC_DROPPABLE:
1875 value = tipc_port_unreliable(port);
1876 break;
1877 case TIPC_DEST_DROPPABLE:
1878 value = tipc_port_unreturnable(port);
1879 break;
1880 case TIPC_CONN_TIMEOUT:
1881 value = tipc_sk(sk)->conn_timeout;
1882 /* no need to set "res", since already 0 at this point */
1883 break;
1884 case TIPC_NODE_RECVQ_DEPTH:
1885 value = 0; /* was tipc_queue_size, now obsolete */
1886 break;
1887 case TIPC_SOCK_RECVQ_DEPTH:
1888 value = skb_queue_len(&sk->sk_receive_queue);
1889 break;
1890 default:
1891 res = -EINVAL;
1892 }
1893
1894 release_sock(sk);
1895
1896 if (res)
1897 return res; /* "get" failed */
1898
1899 if (len < sizeof(value))
1900 return -EINVAL;
1901
1902 if (copy_to_user(ov, &value, sizeof(value)))
1903 return -EFAULT;
1904
1905 return put_user(sizeof(value), ol);
1906}
1907
1908/* Protocol switches for the various types of TIPC sockets */
1909
1910static const struct proto_ops msg_ops = {
1911 .owner = THIS_MODULE,
1912 .family = AF_TIPC,
1913 .release = tipc_release,
1914 .bind = tipc_bind,
1915 .connect = tipc_connect,
1916 .socketpair = sock_no_socketpair,
1917 .accept = sock_no_accept,
1918 .getname = tipc_getname,
1919 .poll = tipc_poll,
1920 .ioctl = sock_no_ioctl,
1921 .listen = sock_no_listen,
1922 .shutdown = tipc_shutdown,
1923 .setsockopt = tipc_setsockopt,
1924 .getsockopt = tipc_getsockopt,
1925 .sendmsg = tipc_sendmsg,
1926 .recvmsg = tipc_recvmsg,
1927 .mmap = sock_no_mmap,
1928 .sendpage = sock_no_sendpage
1929};
1930
1931static const struct proto_ops packet_ops = {
1932 .owner = THIS_MODULE,
1933 .family = AF_TIPC,
1934 .release = tipc_release,
1935 .bind = tipc_bind,
1936 .connect = tipc_connect,
1937 .socketpair = sock_no_socketpair,
1938 .accept = tipc_accept,
1939 .getname = tipc_getname,
1940 .poll = tipc_poll,
1941 .ioctl = sock_no_ioctl,
1942 .listen = tipc_listen,
1943 .shutdown = tipc_shutdown,
1944 .setsockopt = tipc_setsockopt,
1945 .getsockopt = tipc_getsockopt,
1946 .sendmsg = tipc_send_packet,
1947 .recvmsg = tipc_recvmsg,
1948 .mmap = sock_no_mmap,
1949 .sendpage = sock_no_sendpage
1950};
1951
1952static const struct proto_ops stream_ops = {
1953 .owner = THIS_MODULE,
1954 .family = AF_TIPC,
1955 .release = tipc_release,
1956 .bind = tipc_bind,
1957 .connect = tipc_connect,
1958 .socketpair = sock_no_socketpair,
1959 .accept = tipc_accept,
1960 .getname = tipc_getname,
1961 .poll = tipc_poll,
1962 .ioctl = sock_no_ioctl,
1963 .listen = tipc_listen,
1964 .shutdown = tipc_shutdown,
1965 .setsockopt = tipc_setsockopt,
1966 .getsockopt = tipc_getsockopt,
1967 .sendmsg = tipc_send_stream,
1968 .recvmsg = tipc_recv_stream,
1969 .mmap = sock_no_mmap,
1970 .sendpage = sock_no_sendpage
1971};
1972
1973static const struct net_proto_family tipc_family_ops = {
1974 .owner = THIS_MODULE,
1975 .family = AF_TIPC,
1976 .create = tipc_sk_create
1977};
1978
1979static struct proto tipc_proto = {
1980 .name = "TIPC",
1981 .owner = THIS_MODULE,
1982 .obj_size = sizeof(struct tipc_sock),
1983 .sysctl_rmem = sysctl_tipc_rmem
1984};
1985
1986static struct proto tipc_proto_kern = {
1987 .name = "TIPC",
1988 .obj_size = sizeof(struct tipc_sock),
1989 .sysctl_rmem = sysctl_tipc_rmem
1990};
1991
1992/**
1993 * tipc_socket_init - initialize TIPC socket interface
1994 *
1995 * Returns 0 on success, errno otherwise
1996 */
1997int tipc_socket_init(void)
1998{
1999 int res;
2000
2001 res = proto_register(&tipc_proto, 1);
2002 if (res) {
2003 pr_err("Failed to register TIPC protocol type\n");
2004 goto out;
2005 }
2006
2007 res = sock_register(&tipc_family_ops);
2008 if (res) {
2009 pr_err("Failed to register TIPC socket type\n");
2010 proto_unregister(&tipc_proto);
2011 goto out;
2012 }
2013 out:
2014 return res;
2015}
2016
2017/**
2018 * tipc_socket_stop - stop TIPC socket interface
2019 */
2020void tipc_socket_stop(void)
2021{
2022 sock_unregister(tipc_family_ops.family);
2023 proto_unregister(&tipc_proto);
2024}
1/*
2 * net/tipc/socket.c: TIPC socket API
3 *
4 * Copyright (c) 2001-2007, 2012-2019, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
6 * Copyright (c) 2020-2021, Red Hat Inc
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 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/rhashtable.h>
39#include <linux/sched/signal.h>
40
41#include "core.h"
42#include "name_table.h"
43#include "node.h"
44#include "link.h"
45#include "name_distr.h"
46#include "socket.h"
47#include "bcast.h"
48#include "netlink.h"
49#include "group.h"
50#include "trace.h"
51
52#define NAGLE_START_INIT 4
53#define NAGLE_START_MAX 1024
54#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
55#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
56#define TIPC_MAX_PORT 0xffffffff
57#define TIPC_MIN_PORT 1
58#define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */
59
60enum {
61 TIPC_LISTEN = TCP_LISTEN,
62 TIPC_ESTABLISHED = TCP_ESTABLISHED,
63 TIPC_OPEN = TCP_CLOSE,
64 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
65 TIPC_CONNECTING = TCP_SYN_SENT,
66};
67
68struct sockaddr_pair {
69 struct sockaddr_tipc sock;
70 struct sockaddr_tipc member;
71};
72
73/**
74 * struct tipc_sock - TIPC socket structure
75 * @sk: socket - interacts with 'port' and with user via the socket API
76 * @max_pkt: maximum packet size "hint" used when building messages sent by port
77 * @maxnagle: maximum size of msg which can be subject to nagle
78 * @portid: unique port identity in TIPC socket hash table
79 * @phdr: preformatted message header used when sending messages
80 * @cong_links: list of congested links
81 * @publications: list of publications for port
82 * @blocking_link: address of the congested link we are currently sleeping on
83 * @pub_count: total # of publications port has made during its lifetime
84 * @conn_timeout: the time we can wait for an unresponded setup request
85 * @probe_unacked: probe has not received ack yet
86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
87 * @cong_link_cnt: number of congested links
88 * @snt_unacked: # messages sent by socket, and not yet acked by peer
89 * @snd_win: send window size
90 * @peer_caps: peer capabilities mask
91 * @rcv_unacked: # messages read by user, but not yet acked back to peer
92 * @rcv_win: receive window size
93 * @peer: 'connected' peer for dgram/rdm
94 * @node: hash table node
95 * @mc_method: cookie for use between socket and broadcast layer
96 * @rcu: rcu struct for tipc_sock
97 * @group: TIPC communications group
98 * @oneway: message count in one direction (FIXME)
99 * @nagle_start: current nagle value
100 * @snd_backlog: send backlog count
101 * @msg_acc: messages accepted; used in managing backlog and nagle
102 * @pkt_cnt: TIPC socket packet count
103 * @expect_ack: whether this TIPC socket is expecting an ack
104 * @nodelay: setsockopt() TIPC_NODELAY setting
105 * @group_is_open: TIPC socket group is fully open (FIXME)
106 * @published: true if port has one or more associated names
107 * @conn_addrtype: address type used when establishing connection
108 */
109struct tipc_sock {
110 struct sock sk;
111 u32 max_pkt;
112 u32 maxnagle;
113 u32 portid;
114 struct tipc_msg phdr;
115 struct list_head cong_links;
116 struct list_head publications;
117 u32 pub_count;
118 atomic_t dupl_rcvcnt;
119 u16 conn_timeout;
120 bool probe_unacked;
121 u16 cong_link_cnt;
122 u16 snt_unacked;
123 u16 snd_win;
124 u16 peer_caps;
125 u16 rcv_unacked;
126 u16 rcv_win;
127 struct sockaddr_tipc peer;
128 struct rhash_head node;
129 struct tipc_mc_method mc_method;
130 struct rcu_head rcu;
131 struct tipc_group *group;
132 u32 oneway;
133 u32 nagle_start;
134 u16 snd_backlog;
135 u16 msg_acc;
136 u16 pkt_cnt;
137 bool expect_ack;
138 bool nodelay;
139 bool group_is_open;
140 bool published;
141 u8 conn_addrtype;
142};
143
144static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
145static void tipc_data_ready(struct sock *sk);
146static void tipc_write_space(struct sock *sk);
147static void tipc_sock_destruct(struct sock *sk);
148static int tipc_release(struct socket *sock);
149static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
150 bool kern);
151static void tipc_sk_timeout(struct timer_list *t);
152static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
153static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
154static int tipc_sk_leave(struct tipc_sock *tsk);
155static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
156static int tipc_sk_insert(struct tipc_sock *tsk);
157static void tipc_sk_remove(struct tipc_sock *tsk);
158static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
159static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
160static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
161static int tipc_wait_for_connect(struct socket *sock, long *timeo_p);
162
163static const struct proto_ops packet_ops;
164static const struct proto_ops stream_ops;
165static const struct proto_ops msg_ops;
166static struct proto tipc_proto;
167static const struct rhashtable_params tsk_rht_params;
168
169static u32 tsk_own_node(struct tipc_sock *tsk)
170{
171 return msg_prevnode(&tsk->phdr);
172}
173
174static u32 tsk_peer_node(struct tipc_sock *tsk)
175{
176 return msg_destnode(&tsk->phdr);
177}
178
179static u32 tsk_peer_port(struct tipc_sock *tsk)
180{
181 return msg_destport(&tsk->phdr);
182}
183
184static bool tsk_unreliable(struct tipc_sock *tsk)
185{
186 return msg_src_droppable(&tsk->phdr) != 0;
187}
188
189static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
190{
191 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
192}
193
194static bool tsk_unreturnable(struct tipc_sock *tsk)
195{
196 return msg_dest_droppable(&tsk->phdr) != 0;
197}
198
199static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
200{
201 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
202}
203
204static int tsk_importance(struct tipc_sock *tsk)
205{
206 return msg_importance(&tsk->phdr);
207}
208
209static struct tipc_sock *tipc_sk(const struct sock *sk)
210{
211 return container_of(sk, struct tipc_sock, sk);
212}
213
214int tsk_set_importance(struct sock *sk, int imp)
215{
216 if (imp > TIPC_CRITICAL_IMPORTANCE)
217 return -EINVAL;
218 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
219 return 0;
220}
221
222static bool tsk_conn_cong(struct tipc_sock *tsk)
223{
224 return tsk->snt_unacked > tsk->snd_win;
225}
226
227static u16 tsk_blocks(int len)
228{
229 return ((len / FLOWCTL_BLK_SZ) + 1);
230}
231
232/* tsk_blocks(): translate a buffer size in bytes to number of
233 * advertisable blocks, taking into account the ratio truesize(len)/len
234 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
235 */
236static u16 tsk_adv_blocks(int len)
237{
238 return len / FLOWCTL_BLK_SZ / 4;
239}
240
241/* tsk_inc(): increment counter for sent or received data
242 * - If block based flow control is not supported by peer we
243 * fall back to message based ditto, incrementing the counter
244 */
245static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
246{
247 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
248 return ((msglen / FLOWCTL_BLK_SZ) + 1);
249 return 1;
250}
251
252/* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
253 */
254static void tsk_set_nagle(struct tipc_sock *tsk)
255{
256 struct sock *sk = &tsk->sk;
257
258 tsk->maxnagle = 0;
259 if (sk->sk_type != SOCK_STREAM)
260 return;
261 if (tsk->nodelay)
262 return;
263 if (!(tsk->peer_caps & TIPC_NAGLE))
264 return;
265 /* Limit node local buffer size to avoid receive queue overflow */
266 if (tsk->max_pkt == MAX_MSG_SIZE)
267 tsk->maxnagle = 1500;
268 else
269 tsk->maxnagle = tsk->max_pkt;
270}
271
272/**
273 * tsk_advance_rx_queue - discard first buffer in socket receive queue
274 * @sk: network socket
275 *
276 * Caller must hold socket lock
277 */
278static void tsk_advance_rx_queue(struct sock *sk)
279{
280 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
281 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
282}
283
284/* tipc_sk_respond() : send response message back to sender
285 */
286static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
287{
288 u32 selector;
289 u32 dnode;
290 u32 onode = tipc_own_addr(sock_net(sk));
291
292 if (!tipc_msg_reverse(onode, &skb, err))
293 return;
294
295 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
296 dnode = msg_destnode(buf_msg(skb));
297 selector = msg_origport(buf_msg(skb));
298 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
299}
300
301/**
302 * tsk_rej_rx_queue - reject all buffers in socket receive queue
303 * @sk: network socket
304 * @error: response error code
305 *
306 * Caller must hold socket lock
307 */
308static void tsk_rej_rx_queue(struct sock *sk, int error)
309{
310 struct sk_buff *skb;
311
312 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
313 tipc_sk_respond(sk, skb, error);
314}
315
316static bool tipc_sk_connected(struct sock *sk)
317{
318 return sk->sk_state == TIPC_ESTABLISHED;
319}
320
321/* tipc_sk_type_connectionless - check if the socket is datagram socket
322 * @sk: socket
323 *
324 * Returns true if connection less, false otherwise
325 */
326static bool tipc_sk_type_connectionless(struct sock *sk)
327{
328 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
329}
330
331/* tsk_peer_msg - verify if message was sent by connected port's peer
332 *
333 * Handles cases where the node's network address has changed from
334 * the default of <0.0.0> to its configured setting.
335 */
336static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
337{
338 struct sock *sk = &tsk->sk;
339 u32 self = tipc_own_addr(sock_net(sk));
340 u32 peer_port = tsk_peer_port(tsk);
341 u32 orig_node, peer_node;
342
343 if (unlikely(!tipc_sk_connected(sk)))
344 return false;
345
346 if (unlikely(msg_origport(msg) != peer_port))
347 return false;
348
349 orig_node = msg_orignode(msg);
350 peer_node = tsk_peer_node(tsk);
351
352 if (likely(orig_node == peer_node))
353 return true;
354
355 if (!orig_node && peer_node == self)
356 return true;
357
358 if (!peer_node && orig_node == self)
359 return true;
360
361 return false;
362}
363
364/* tipc_set_sk_state - set the sk_state of the socket
365 * @sk: socket
366 *
367 * Caller must hold socket lock
368 *
369 * Returns 0 on success, errno otherwise
370 */
371static int tipc_set_sk_state(struct sock *sk, int state)
372{
373 int oldsk_state = sk->sk_state;
374 int res = -EINVAL;
375
376 switch (state) {
377 case TIPC_OPEN:
378 res = 0;
379 break;
380 case TIPC_LISTEN:
381 case TIPC_CONNECTING:
382 if (oldsk_state == TIPC_OPEN)
383 res = 0;
384 break;
385 case TIPC_ESTABLISHED:
386 if (oldsk_state == TIPC_CONNECTING ||
387 oldsk_state == TIPC_OPEN)
388 res = 0;
389 break;
390 case TIPC_DISCONNECTING:
391 if (oldsk_state == TIPC_CONNECTING ||
392 oldsk_state == TIPC_ESTABLISHED)
393 res = 0;
394 break;
395 }
396
397 if (!res)
398 sk->sk_state = state;
399
400 return res;
401}
402
403static int tipc_sk_sock_err(struct socket *sock, long *timeout)
404{
405 struct sock *sk = sock->sk;
406 int err = sock_error(sk);
407 int typ = sock->type;
408
409 if (err)
410 return err;
411 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
412 if (sk->sk_state == TIPC_DISCONNECTING)
413 return -EPIPE;
414 else if (!tipc_sk_connected(sk))
415 return -ENOTCONN;
416 }
417 if (!*timeout)
418 return -EAGAIN;
419 if (signal_pending(current))
420 return sock_intr_errno(*timeout);
421
422 return 0;
423}
424
425#define tipc_wait_for_cond(sock_, timeo_, condition_) \
426({ \
427 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
428 struct sock *sk_; \
429 int rc_; \
430 \
431 while ((rc_ = !(condition_))) { \
432 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
433 smp_rmb(); \
434 sk_ = (sock_)->sk; \
435 rc_ = tipc_sk_sock_err((sock_), timeo_); \
436 if (rc_) \
437 break; \
438 add_wait_queue(sk_sleep(sk_), &wait_); \
439 release_sock(sk_); \
440 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
441 sched_annotate_sleep(); \
442 lock_sock(sk_); \
443 remove_wait_queue(sk_sleep(sk_), &wait_); \
444 } \
445 rc_; \
446})
447
448/**
449 * tipc_sk_create - create a TIPC socket
450 * @net: network namespace (must be default network)
451 * @sock: pre-allocated socket structure
452 * @protocol: protocol indicator (must be 0)
453 * @kern: caused by kernel or by userspace?
454 *
455 * This routine creates additional data structures used by the TIPC socket,
456 * initializes them, and links them together.
457 *
458 * Return: 0 on success, errno otherwise
459 */
460static int tipc_sk_create(struct net *net, struct socket *sock,
461 int protocol, int kern)
462{
463 const struct proto_ops *ops;
464 struct sock *sk;
465 struct tipc_sock *tsk;
466 struct tipc_msg *msg;
467
468 /* Validate arguments */
469 if (unlikely(protocol != 0))
470 return -EPROTONOSUPPORT;
471
472 switch (sock->type) {
473 case SOCK_STREAM:
474 ops = &stream_ops;
475 break;
476 case SOCK_SEQPACKET:
477 ops = &packet_ops;
478 break;
479 case SOCK_DGRAM:
480 case SOCK_RDM:
481 ops = &msg_ops;
482 break;
483 default:
484 return -EPROTOTYPE;
485 }
486
487 /* Allocate socket's protocol area */
488 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
489 if (sk == NULL)
490 return -ENOMEM;
491
492 tsk = tipc_sk(sk);
493 tsk->max_pkt = MAX_PKT_DEFAULT;
494 tsk->maxnagle = 0;
495 tsk->nagle_start = NAGLE_START_INIT;
496 INIT_LIST_HEAD(&tsk->publications);
497 INIT_LIST_HEAD(&tsk->cong_links);
498 msg = &tsk->phdr;
499
500 /* Finish initializing socket data structures */
501 sock->ops = ops;
502 sock_init_data(sock, sk);
503 tipc_set_sk_state(sk, TIPC_OPEN);
504 if (tipc_sk_insert(tsk)) {
505 pr_warn("Socket create failed; port number exhausted\n");
506 return -EINVAL;
507 }
508
509 /* Ensure tsk is visible before we read own_addr. */
510 smp_mb();
511
512 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
513 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
514
515 msg_set_origport(msg, tsk->portid);
516 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
517 sk->sk_shutdown = 0;
518 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
519 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
520 sk->sk_data_ready = tipc_data_ready;
521 sk->sk_write_space = tipc_write_space;
522 sk->sk_destruct = tipc_sock_destruct;
523 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
524 tsk->group_is_open = true;
525 atomic_set(&tsk->dupl_rcvcnt, 0);
526
527 /* Start out with safe limits until we receive an advertised window */
528 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
529 tsk->rcv_win = tsk->snd_win;
530
531 if (tipc_sk_type_connectionless(sk)) {
532 tsk_set_unreturnable(tsk, true);
533 if (sock->type == SOCK_DGRAM)
534 tsk_set_unreliable(tsk, true);
535 }
536 __skb_queue_head_init(&tsk->mc_method.deferredq);
537 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
538 return 0;
539}
540
541static void tipc_sk_callback(struct rcu_head *head)
542{
543 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
544
545 sock_put(&tsk->sk);
546}
547
548/* Caller should hold socket lock for the socket. */
549static void __tipc_shutdown(struct socket *sock, int error)
550{
551 struct sock *sk = sock->sk;
552 struct tipc_sock *tsk = tipc_sk(sk);
553 struct net *net = sock_net(sk);
554 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
555 u32 dnode = tsk_peer_node(tsk);
556 struct sk_buff *skb;
557
558 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
559 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
560 !tsk_conn_cong(tsk)));
561
562 /* Push out delayed messages if in Nagle mode */
563 tipc_sk_push_backlog(tsk, false);
564 /* Remove pending SYN */
565 __skb_queue_purge(&sk->sk_write_queue);
566
567 /* Remove partially received buffer if any */
568 skb = skb_peek(&sk->sk_receive_queue);
569 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
570 __skb_unlink(skb, &sk->sk_receive_queue);
571 kfree_skb(skb);
572 }
573
574 /* Reject all unreceived messages if connectionless */
575 if (tipc_sk_type_connectionless(sk)) {
576 tsk_rej_rx_queue(sk, error);
577 return;
578 }
579
580 switch (sk->sk_state) {
581 case TIPC_CONNECTING:
582 case TIPC_ESTABLISHED:
583 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
584 tipc_node_remove_conn(net, dnode, tsk->portid);
585 /* Send a FIN+/- to its peer */
586 skb = __skb_dequeue(&sk->sk_receive_queue);
587 if (skb) {
588 __skb_queue_purge(&sk->sk_receive_queue);
589 tipc_sk_respond(sk, skb, error);
590 break;
591 }
592 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
593 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
594 tsk_own_node(tsk), tsk_peer_port(tsk),
595 tsk->portid, error);
596 if (skb)
597 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
598 break;
599 case TIPC_LISTEN:
600 /* Reject all SYN messages */
601 tsk_rej_rx_queue(sk, error);
602 break;
603 default:
604 __skb_queue_purge(&sk->sk_receive_queue);
605 break;
606 }
607}
608
609/**
610 * tipc_release - destroy a TIPC socket
611 * @sock: socket to destroy
612 *
613 * This routine cleans up any messages that are still queued on the socket.
614 * For DGRAM and RDM socket types, all queued messages are rejected.
615 * For SEQPACKET and STREAM socket types, the first message is rejected
616 * and any others are discarded. (If the first message on a STREAM socket
617 * is partially-read, it is discarded and the next one is rejected instead.)
618 *
619 * NOTE: Rejected messages are not necessarily returned to the sender! They
620 * are returned or discarded according to the "destination droppable" setting
621 * specified for the message by the sender.
622 *
623 * Return: 0 on success, errno otherwise
624 */
625static int tipc_release(struct socket *sock)
626{
627 struct sock *sk = sock->sk;
628 struct tipc_sock *tsk;
629
630 /*
631 * Exit if socket isn't fully initialized (occurs when a failed accept()
632 * releases a pre-allocated child socket that was never used)
633 */
634 if (sk == NULL)
635 return 0;
636
637 tsk = tipc_sk(sk);
638 lock_sock(sk);
639
640 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
641 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
642 sk->sk_shutdown = SHUTDOWN_MASK;
643 tipc_sk_leave(tsk);
644 tipc_sk_withdraw(tsk, NULL);
645 __skb_queue_purge(&tsk->mc_method.deferredq);
646 sk_stop_timer(sk, &sk->sk_timer);
647 tipc_sk_remove(tsk);
648
649 sock_orphan(sk);
650 /* Reject any messages that accumulated in backlog queue */
651 release_sock(sk);
652 tipc_dest_list_purge(&tsk->cong_links);
653 tsk->cong_link_cnt = 0;
654 call_rcu(&tsk->rcu, tipc_sk_callback);
655 sock->sk = NULL;
656
657 return 0;
658}
659
660/**
661 * __tipc_bind - associate or disassocate TIPC name(s) with a socket
662 * @sock: socket structure
663 * @skaddr: socket address describing name(s) and desired operation
664 * @alen: size of socket address data structure
665 *
666 * Name and name sequence binding are indicated using a positive scope value;
667 * a negative scope value unbinds the specified name. Specifying no name
668 * (i.e. a socket address length of 0) unbinds all names from the socket.
669 *
670 * Return: 0 on success, errno otherwise
671 *
672 * NOTE: This routine doesn't need to take the socket lock since it doesn't
673 * access any non-constant socket information.
674 */
675static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
676{
677 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
678 struct tipc_sock *tsk = tipc_sk(sock->sk);
679 bool unbind = false;
680
681 if (unlikely(!alen))
682 return tipc_sk_withdraw(tsk, NULL);
683
684 if (ua->addrtype == TIPC_SERVICE_ADDR) {
685 ua->addrtype = TIPC_SERVICE_RANGE;
686 ua->sr.upper = ua->sr.lower;
687 }
688 if (ua->scope < 0) {
689 unbind = true;
690 ua->scope = -ua->scope;
691 }
692 /* Users may still use deprecated TIPC_ZONE_SCOPE */
693 if (ua->scope != TIPC_NODE_SCOPE)
694 ua->scope = TIPC_CLUSTER_SCOPE;
695
696 if (tsk->group)
697 return -EACCES;
698
699 if (unbind)
700 return tipc_sk_withdraw(tsk, ua);
701 return tipc_sk_publish(tsk, ua);
702}
703
704int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
705{
706 int res;
707
708 lock_sock(sock->sk);
709 res = __tipc_bind(sock, skaddr, alen);
710 release_sock(sock->sk);
711 return res;
712}
713
714static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
715{
716 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
717 u32 atype = ua->addrtype;
718
719 if (alen) {
720 if (!tipc_uaddr_valid(ua, alen))
721 return -EINVAL;
722 if (atype == TIPC_SOCKET_ADDR)
723 return -EAFNOSUPPORT;
724 if (ua->sr.type < TIPC_RESERVED_TYPES) {
725 pr_warn_once("Can't bind to reserved service type %u\n",
726 ua->sr.type);
727 return -EACCES;
728 }
729 }
730 return tipc_sk_bind(sock, skaddr, alen);
731}
732
733/**
734 * tipc_getname - get port ID of socket or peer socket
735 * @sock: socket structure
736 * @uaddr: area for returned socket address
737 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
738 *
739 * Return: 0 on success, errno otherwise
740 *
741 * NOTE: This routine doesn't need to take the socket lock since it only
742 * accesses socket information that is unchanging (or which changes in
743 * a completely predictable manner).
744 */
745static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
746 int peer)
747{
748 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
749 struct sock *sk = sock->sk;
750 struct tipc_sock *tsk = tipc_sk(sk);
751
752 memset(addr, 0, sizeof(*addr));
753 if (peer) {
754 if ((!tipc_sk_connected(sk)) &&
755 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
756 return -ENOTCONN;
757 addr->addr.id.ref = tsk_peer_port(tsk);
758 addr->addr.id.node = tsk_peer_node(tsk);
759 } else {
760 addr->addr.id.ref = tsk->portid;
761 addr->addr.id.node = tipc_own_addr(sock_net(sk));
762 }
763
764 addr->addrtype = TIPC_SOCKET_ADDR;
765 addr->family = AF_TIPC;
766 addr->scope = 0;
767 addr->addr.name.domain = 0;
768
769 return sizeof(*addr);
770}
771
772/**
773 * tipc_poll - read and possibly block on pollmask
774 * @file: file structure associated with the socket
775 * @sock: socket for which to calculate the poll bits
776 * @wait: ???
777 *
778 * Return: pollmask value
779 *
780 * COMMENTARY:
781 * It appears that the usual socket locking mechanisms are not useful here
782 * since the pollmask info is potentially out-of-date the moment this routine
783 * exits. TCP and other protocols seem to rely on higher level poll routines
784 * to handle any preventable race conditions, so TIPC will do the same ...
785 *
786 * IMPORTANT: The fact that a read or write operation is indicated does NOT
787 * imply that the operation will succeed, merely that it should be performed
788 * and will not block.
789 */
790static __poll_t tipc_poll(struct file *file, struct socket *sock,
791 poll_table *wait)
792{
793 struct sock *sk = sock->sk;
794 struct tipc_sock *tsk = tipc_sk(sk);
795 __poll_t revents = 0;
796
797 sock_poll_wait(file, sock, wait);
798 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
799
800 if (sk->sk_shutdown & RCV_SHUTDOWN)
801 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
802 if (sk->sk_shutdown == SHUTDOWN_MASK)
803 revents |= EPOLLHUP;
804
805 switch (sk->sk_state) {
806 case TIPC_ESTABLISHED:
807 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
808 revents |= EPOLLOUT;
809 fallthrough;
810 case TIPC_LISTEN:
811 case TIPC_CONNECTING:
812 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
813 revents |= EPOLLIN | EPOLLRDNORM;
814 break;
815 case TIPC_OPEN:
816 if (tsk->group_is_open && !tsk->cong_link_cnt)
817 revents |= EPOLLOUT;
818 if (!tipc_sk_type_connectionless(sk))
819 break;
820 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
821 break;
822 revents |= EPOLLIN | EPOLLRDNORM;
823 break;
824 case TIPC_DISCONNECTING:
825 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
826 break;
827 }
828 return revents;
829}
830
831/**
832 * tipc_sendmcast - send multicast message
833 * @sock: socket structure
834 * @ua: destination address struct
835 * @msg: message to send
836 * @dlen: length of data to send
837 * @timeout: timeout to wait for wakeup
838 *
839 * Called from function tipc_sendmsg(), which has done all sanity checks
840 * Return: the number of bytes sent on success, or errno
841 */
842static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua,
843 struct msghdr *msg, size_t dlen, long timeout)
844{
845 struct sock *sk = sock->sk;
846 struct tipc_sock *tsk = tipc_sk(sk);
847 struct tipc_msg *hdr = &tsk->phdr;
848 struct net *net = sock_net(sk);
849 int mtu = tipc_bcast_get_mtu(net);
850 struct sk_buff_head pkts;
851 struct tipc_nlist dsts;
852 int rc;
853
854 if (tsk->group)
855 return -EACCES;
856
857 /* Block or return if any destination link is congested */
858 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
859 if (unlikely(rc))
860 return rc;
861
862 /* Lookup destination nodes */
863 tipc_nlist_init(&dsts, tipc_own_addr(net));
864 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts);
865 if (!dsts.local && !dsts.remote)
866 return -EHOSTUNREACH;
867
868 /* Build message header */
869 msg_set_type(hdr, TIPC_MCAST_MSG);
870 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
871 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
872 msg_set_destport(hdr, 0);
873 msg_set_destnode(hdr, 0);
874 msg_set_nametype(hdr, ua->sr.type);
875 msg_set_namelower(hdr, ua->sr.lower);
876 msg_set_nameupper(hdr, ua->sr.upper);
877
878 /* Build message as chain of buffers */
879 __skb_queue_head_init(&pkts);
880 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
881
882 /* Send message if build was successful */
883 if (unlikely(rc == dlen)) {
884 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
885 TIPC_DUMP_SK_SNDQ, " ");
886 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts,
887 &tsk->cong_link_cnt);
888 }
889
890 tipc_nlist_purge(&dsts);
891
892 return rc ? rc : dlen;
893}
894
895/**
896 * tipc_send_group_msg - send a message to a member in the group
897 * @net: network namespace
898 * @tsk: tipc socket
899 * @m: message to send
900 * @mb: group member
901 * @dnode: destination node
902 * @dport: destination port
903 * @dlen: total length of message data
904 */
905static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
906 struct msghdr *m, struct tipc_member *mb,
907 u32 dnode, u32 dport, int dlen)
908{
909 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
910 struct tipc_mc_method *method = &tsk->mc_method;
911 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
912 struct tipc_msg *hdr = &tsk->phdr;
913 struct sk_buff_head pkts;
914 int mtu, rc;
915
916 /* Complete message header */
917 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
918 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
919 msg_set_destport(hdr, dport);
920 msg_set_destnode(hdr, dnode);
921 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
922
923 /* Build message as chain of buffers */
924 __skb_queue_head_init(&pkts);
925 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
926 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
927 if (unlikely(rc != dlen))
928 return rc;
929
930 /* Send message */
931 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
932 if (unlikely(rc == -ELINKCONG)) {
933 tipc_dest_push(&tsk->cong_links, dnode, 0);
934 tsk->cong_link_cnt++;
935 }
936
937 /* Update send window */
938 tipc_group_update_member(mb, blks);
939
940 /* A broadcast sent within next EXPIRE period must follow same path */
941 method->rcast = true;
942 method->mandatory = true;
943 return dlen;
944}
945
946/**
947 * tipc_send_group_unicast - send message to a member in the group
948 * @sock: socket structure
949 * @m: message to send
950 * @dlen: total length of message data
951 * @timeout: timeout to wait for wakeup
952 *
953 * Called from function tipc_sendmsg(), which has done all sanity checks
954 * Return: the number of bytes sent on success, or errno
955 */
956static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
957 int dlen, long timeout)
958{
959 struct sock *sk = sock->sk;
960 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
961 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
962 struct tipc_sock *tsk = tipc_sk(sk);
963 struct net *net = sock_net(sk);
964 struct tipc_member *mb = NULL;
965 u32 node, port;
966 int rc;
967
968 node = ua->sk.node;
969 port = ua->sk.ref;
970 if (!port && !node)
971 return -EHOSTUNREACH;
972
973 /* Block or return if destination link or member is congested */
974 rc = tipc_wait_for_cond(sock, &timeout,
975 !tipc_dest_find(&tsk->cong_links, node, 0) &&
976 tsk->group &&
977 !tipc_group_cong(tsk->group, node, port, blks,
978 &mb));
979 if (unlikely(rc))
980 return rc;
981
982 if (unlikely(!mb))
983 return -EHOSTUNREACH;
984
985 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
986
987 return rc ? rc : dlen;
988}
989
990/**
991 * tipc_send_group_anycast - send message to any member with given identity
992 * @sock: socket structure
993 * @m: message to send
994 * @dlen: total length of message data
995 * @timeout: timeout to wait for wakeup
996 *
997 * Called from function tipc_sendmsg(), which has done all sanity checks
998 * Return: the number of bytes sent on success, or errno
999 */
1000static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
1001 int dlen, long timeout)
1002{
1003 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1004 struct sock *sk = sock->sk;
1005 struct tipc_sock *tsk = tipc_sk(sk);
1006 struct list_head *cong_links = &tsk->cong_links;
1007 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
1008 struct tipc_msg *hdr = &tsk->phdr;
1009 struct tipc_member *first = NULL;
1010 struct tipc_member *mbr = NULL;
1011 struct net *net = sock_net(sk);
1012 u32 node, port, exclude;
1013 struct list_head dsts;
1014 int lookups = 0;
1015 int dstcnt, rc;
1016 bool cong;
1017
1018 INIT_LIST_HEAD(&dsts);
1019 ua->sa.type = msg_nametype(hdr);
1020 ua->scope = msg_lookup_scope(hdr);
1021
1022 while (++lookups < 4) {
1023 exclude = tipc_group_exclude(tsk->group);
1024
1025 first = NULL;
1026
1027 /* Look for a non-congested destination member, if any */
1028 while (1) {
1029 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1030 exclude, false))
1031 return -EHOSTUNREACH;
1032 tipc_dest_pop(&dsts, &node, &port);
1033 cong = tipc_group_cong(tsk->group, node, port, blks,
1034 &mbr);
1035 if (!cong)
1036 break;
1037 if (mbr == first)
1038 break;
1039 if (!first)
1040 first = mbr;
1041 }
1042
1043 /* Start over if destination was not in member list */
1044 if (unlikely(!mbr))
1045 continue;
1046
1047 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1048 break;
1049
1050 /* Block or return if destination link or member is congested */
1051 rc = tipc_wait_for_cond(sock, &timeout,
1052 !tipc_dest_find(cong_links, node, 0) &&
1053 tsk->group &&
1054 !tipc_group_cong(tsk->group, node, port,
1055 blks, &mbr));
1056 if (unlikely(rc))
1057 return rc;
1058
1059 /* Send, unless destination disappeared while waiting */
1060 if (likely(mbr))
1061 break;
1062 }
1063
1064 if (unlikely(lookups >= 4))
1065 return -EHOSTUNREACH;
1066
1067 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1068
1069 return rc ? rc : dlen;
1070}
1071
1072/**
1073 * tipc_send_group_bcast - send message to all members in communication group
1074 * @sock: socket structure
1075 * @m: message to send
1076 * @dlen: total length of message data
1077 * @timeout: timeout to wait for wakeup
1078 *
1079 * Called from function tipc_sendmsg(), which has done all sanity checks
1080 * Return: the number of bytes sent on success, or errno
1081 */
1082static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1083 int dlen, long timeout)
1084{
1085 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1086 struct sock *sk = sock->sk;
1087 struct net *net = sock_net(sk);
1088 struct tipc_sock *tsk = tipc_sk(sk);
1089 struct tipc_nlist *dsts;
1090 struct tipc_mc_method *method = &tsk->mc_method;
1091 bool ack = method->mandatory && method->rcast;
1092 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1093 struct tipc_msg *hdr = &tsk->phdr;
1094 int mtu = tipc_bcast_get_mtu(net);
1095 struct sk_buff_head pkts;
1096 int rc = -EHOSTUNREACH;
1097
1098 /* Block or return if any destination link or member is congested */
1099 rc = tipc_wait_for_cond(sock, &timeout,
1100 !tsk->cong_link_cnt && tsk->group &&
1101 !tipc_group_bc_cong(tsk->group, blks));
1102 if (unlikely(rc))
1103 return rc;
1104
1105 dsts = tipc_group_dests(tsk->group);
1106 if (!dsts->local && !dsts->remote)
1107 return -EHOSTUNREACH;
1108
1109 /* Complete message header */
1110 if (ua) {
1111 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1112 msg_set_nameinst(hdr, ua->sa.instance);
1113 } else {
1114 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1115 msg_set_nameinst(hdr, 0);
1116 }
1117 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1118 msg_set_destport(hdr, 0);
1119 msg_set_destnode(hdr, 0);
1120 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1121
1122 /* Avoid getting stuck with repeated forced replicasts */
1123 msg_set_grp_bc_ack_req(hdr, ack);
1124
1125 /* Build message as chain of buffers */
1126 __skb_queue_head_init(&pkts);
1127 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1128 if (unlikely(rc != dlen))
1129 return rc;
1130
1131 /* Send message */
1132 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1133 if (unlikely(rc))
1134 return rc;
1135
1136 /* Update broadcast sequence number and send windows */
1137 tipc_group_update_bc_members(tsk->group, blks, ack);
1138
1139 /* Broadcast link is now free to choose method for next broadcast */
1140 method->mandatory = false;
1141 method->expires = jiffies;
1142
1143 return dlen;
1144}
1145
1146/**
1147 * tipc_send_group_mcast - send message to all members with given identity
1148 * @sock: socket structure
1149 * @m: message to send
1150 * @dlen: total length of message data
1151 * @timeout: timeout to wait for wakeup
1152 *
1153 * Called from function tipc_sendmsg(), which has done all sanity checks
1154 * Return: the number of bytes sent on success, or errno
1155 */
1156static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1157 int dlen, long timeout)
1158{
1159 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1160 struct sock *sk = sock->sk;
1161 struct tipc_sock *tsk = tipc_sk(sk);
1162 struct tipc_group *grp = tsk->group;
1163 struct tipc_msg *hdr = &tsk->phdr;
1164 struct net *net = sock_net(sk);
1165 struct list_head dsts;
1166 u32 dstcnt, exclude;
1167
1168 INIT_LIST_HEAD(&dsts);
1169 ua->sa.type = msg_nametype(hdr);
1170 ua->scope = msg_lookup_scope(hdr);
1171 exclude = tipc_group_exclude(grp);
1172
1173 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1174 return -EHOSTUNREACH;
1175
1176 if (dstcnt == 1) {
1177 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1178 return tipc_send_group_unicast(sock, m, dlen, timeout);
1179 }
1180
1181 tipc_dest_list_purge(&dsts);
1182 return tipc_send_group_bcast(sock, m, dlen, timeout);
1183}
1184
1185/**
1186 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1187 * @net: the associated network namespace
1188 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1189 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1190 *
1191 * Multi-threaded: parallel calls with reference to same queues may occur
1192 */
1193void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1194 struct sk_buff_head *inputq)
1195{
1196 u32 self = tipc_own_addr(net);
1197 struct sk_buff *skb, *_skb;
1198 u32 portid, onode;
1199 struct sk_buff_head tmpq;
1200 struct list_head dports;
1201 struct tipc_msg *hdr;
1202 struct tipc_uaddr ua;
1203 int user, mtyp, hlen;
1204
1205 __skb_queue_head_init(&tmpq);
1206 INIT_LIST_HEAD(&dports);
1207 ua.addrtype = TIPC_SERVICE_RANGE;
1208
1209 /* tipc_skb_peek() increments the head skb's reference counter */
1210 skb = tipc_skb_peek(arrvq, &inputq->lock);
1211 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1212 hdr = buf_msg(skb);
1213 user = msg_user(hdr);
1214 mtyp = msg_type(hdr);
1215 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1216 onode = msg_orignode(hdr);
1217 ua.sr.type = msg_nametype(hdr);
1218 ua.sr.lower = msg_namelower(hdr);
1219 ua.sr.upper = msg_nameupper(hdr);
1220 if (onode == self)
1221 ua.scope = TIPC_ANY_SCOPE;
1222 else
1223 ua.scope = TIPC_CLUSTER_SCOPE;
1224
1225 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1226 spin_lock_bh(&inputq->lock);
1227 if (skb_peek(arrvq) == skb) {
1228 __skb_dequeue(arrvq);
1229 __skb_queue_tail(inputq, skb);
1230 }
1231 kfree_skb(skb);
1232 spin_unlock_bh(&inputq->lock);
1233 continue;
1234 }
1235
1236 /* Group messages require exact scope match */
1237 if (msg_in_group(hdr)) {
1238 ua.sr.lower = 0;
1239 ua.sr.upper = ~0;
1240 ua.scope = msg_lookup_scope(hdr);
1241 }
1242
1243 /* Create destination port list: */
1244 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1245
1246 /* Clone message per destination */
1247 while (tipc_dest_pop(&dports, NULL, &portid)) {
1248 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1249 if (_skb) {
1250 msg_set_destport(buf_msg(_skb), portid);
1251 __skb_queue_tail(&tmpq, _skb);
1252 continue;
1253 }
1254 pr_warn("Failed to clone mcast rcv buffer\n");
1255 }
1256 /* Append clones to inputq only if skb is still head of arrvq */
1257 spin_lock_bh(&inputq->lock);
1258 if (skb_peek(arrvq) == skb) {
1259 skb_queue_splice_tail_init(&tmpq, inputq);
1260 /* Decrement the skb's refcnt */
1261 kfree_skb(__skb_dequeue(arrvq));
1262 }
1263 spin_unlock_bh(&inputq->lock);
1264 __skb_queue_purge(&tmpq);
1265 kfree_skb(skb);
1266 }
1267 tipc_sk_rcv(net, inputq);
1268}
1269
1270/* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1271 * when socket is in Nagle mode
1272 */
1273static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1274{
1275 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1276 struct sk_buff *skb = skb_peek_tail(txq);
1277 struct net *net = sock_net(&tsk->sk);
1278 u32 dnode = tsk_peer_node(tsk);
1279 int rc;
1280
1281 if (nagle_ack) {
1282 tsk->pkt_cnt += skb_queue_len(txq);
1283 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1284 tsk->oneway = 0;
1285 if (tsk->nagle_start < NAGLE_START_MAX)
1286 tsk->nagle_start *= 2;
1287 tsk->expect_ack = false;
1288 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1289 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1290 tsk->nagle_start);
1291 } else {
1292 tsk->nagle_start = NAGLE_START_INIT;
1293 if (skb) {
1294 msg_set_ack_required(buf_msg(skb));
1295 tsk->expect_ack = true;
1296 } else {
1297 tsk->expect_ack = false;
1298 }
1299 }
1300 tsk->msg_acc = 0;
1301 tsk->pkt_cnt = 0;
1302 }
1303
1304 if (!skb || tsk->cong_link_cnt)
1305 return;
1306
1307 /* Do not send SYN again after congestion */
1308 if (msg_is_syn(buf_msg(skb)))
1309 return;
1310
1311 if (tsk->msg_acc)
1312 tsk->pkt_cnt += skb_queue_len(txq);
1313 tsk->snt_unacked += tsk->snd_backlog;
1314 tsk->snd_backlog = 0;
1315 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1316 if (rc == -ELINKCONG)
1317 tsk->cong_link_cnt = 1;
1318}
1319
1320/**
1321 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1322 * @tsk: receiving socket
1323 * @skb: pointer to message buffer.
1324 * @inputq: buffer list containing the buffers
1325 * @xmitq: output message area
1326 */
1327static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1328 struct sk_buff_head *inputq,
1329 struct sk_buff_head *xmitq)
1330{
1331 struct tipc_msg *hdr = buf_msg(skb);
1332 u32 onode = tsk_own_node(tsk);
1333 struct sock *sk = &tsk->sk;
1334 int mtyp = msg_type(hdr);
1335 bool was_cong;
1336
1337 /* Ignore if connection cannot be validated: */
1338 if (!tsk_peer_msg(tsk, hdr)) {
1339 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1340 goto exit;
1341 }
1342
1343 if (unlikely(msg_errcode(hdr))) {
1344 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1345 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1346 tsk_peer_port(tsk));
1347 sk->sk_state_change(sk);
1348
1349 /* State change is ignored if socket already awake,
1350 * - convert msg to abort msg and add to inqueue
1351 */
1352 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1353 msg_set_type(hdr, TIPC_CONN_MSG);
1354 msg_set_size(hdr, BASIC_H_SIZE);
1355 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1356 __skb_queue_tail(inputq, skb);
1357 return;
1358 }
1359
1360 tsk->probe_unacked = false;
1361
1362 if (mtyp == CONN_PROBE) {
1363 msg_set_type(hdr, CONN_PROBE_REPLY);
1364 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1365 __skb_queue_tail(xmitq, skb);
1366 return;
1367 } else if (mtyp == CONN_ACK) {
1368 was_cong = tsk_conn_cong(tsk);
1369 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1370 tsk->snt_unacked -= msg_conn_ack(hdr);
1371 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1372 tsk->snd_win = msg_adv_win(hdr);
1373 if (was_cong && !tsk_conn_cong(tsk))
1374 sk->sk_write_space(sk);
1375 } else if (mtyp != CONN_PROBE_REPLY) {
1376 pr_warn("Received unknown CONN_PROTO msg\n");
1377 }
1378exit:
1379 kfree_skb(skb);
1380}
1381
1382/**
1383 * tipc_sendmsg - send message in connectionless manner
1384 * @sock: socket structure
1385 * @m: message to send
1386 * @dsz: amount of user data to be sent
1387 *
1388 * Message must have an destination specified explicitly.
1389 * Used for SOCK_RDM and SOCK_DGRAM messages,
1390 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1391 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1392 *
1393 * Return: the number of bytes sent on success, or errno otherwise
1394 */
1395static int tipc_sendmsg(struct socket *sock,
1396 struct msghdr *m, size_t dsz)
1397{
1398 struct sock *sk = sock->sk;
1399 int ret;
1400
1401 lock_sock(sk);
1402 ret = __tipc_sendmsg(sock, m, dsz);
1403 release_sock(sk);
1404
1405 return ret;
1406}
1407
1408static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1409{
1410 struct sock *sk = sock->sk;
1411 struct net *net = sock_net(sk);
1412 struct tipc_sock *tsk = tipc_sk(sk);
1413 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1414 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1415 struct list_head *clinks = &tsk->cong_links;
1416 bool syn = !tipc_sk_type_connectionless(sk);
1417 struct tipc_group *grp = tsk->group;
1418 struct tipc_msg *hdr = &tsk->phdr;
1419 struct tipc_socket_addr skaddr;
1420 struct sk_buff_head pkts;
1421 int atype, mtu, rc;
1422
1423 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1424 return -EMSGSIZE;
1425
1426 if (ua) {
1427 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1428 return -EINVAL;
1429 atype = ua->addrtype;
1430 }
1431
1432 /* If socket belongs to a communication group follow other paths */
1433 if (grp) {
1434 if (!ua)
1435 return tipc_send_group_bcast(sock, m, dlen, timeout);
1436 if (atype == TIPC_SERVICE_ADDR)
1437 return tipc_send_group_anycast(sock, m, dlen, timeout);
1438 if (atype == TIPC_SOCKET_ADDR)
1439 return tipc_send_group_unicast(sock, m, dlen, timeout);
1440 if (atype == TIPC_SERVICE_RANGE)
1441 return tipc_send_group_mcast(sock, m, dlen, timeout);
1442 return -EINVAL;
1443 }
1444
1445 if (!ua) {
1446 ua = (struct tipc_uaddr *)&tsk->peer;
1447 if (!syn && ua->family != AF_TIPC)
1448 return -EDESTADDRREQ;
1449 atype = ua->addrtype;
1450 }
1451
1452 if (unlikely(syn)) {
1453 if (sk->sk_state == TIPC_LISTEN)
1454 return -EPIPE;
1455 if (sk->sk_state != TIPC_OPEN)
1456 return -EISCONN;
1457 if (tsk->published)
1458 return -EOPNOTSUPP;
1459 if (atype == TIPC_SERVICE_ADDR)
1460 tsk->conn_addrtype = atype;
1461 msg_set_syn(hdr, 1);
1462 }
1463
1464 /* Determine destination */
1465 if (atype == TIPC_SERVICE_RANGE) {
1466 return tipc_sendmcast(sock, ua, m, dlen, timeout);
1467 } else if (atype == TIPC_SERVICE_ADDR) {
1468 skaddr.node = ua->lookup_node;
1469 ua->scope = tipc_node2scope(skaddr.node);
1470 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr))
1471 return -EHOSTUNREACH;
1472 } else if (atype == TIPC_SOCKET_ADDR) {
1473 skaddr = ua->sk;
1474 } else {
1475 return -EINVAL;
1476 }
1477
1478 /* Block or return if destination link is congested */
1479 rc = tipc_wait_for_cond(sock, &timeout,
1480 !tipc_dest_find(clinks, skaddr.node, 0));
1481 if (unlikely(rc))
1482 return rc;
1483
1484 /* Finally build message header */
1485 msg_set_destnode(hdr, skaddr.node);
1486 msg_set_destport(hdr, skaddr.ref);
1487 if (atype == TIPC_SERVICE_ADDR) {
1488 msg_set_type(hdr, TIPC_NAMED_MSG);
1489 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1490 msg_set_nametype(hdr, ua->sa.type);
1491 msg_set_nameinst(hdr, ua->sa.instance);
1492 msg_set_lookup_scope(hdr, ua->scope);
1493 } else { /* TIPC_SOCKET_ADDR */
1494 msg_set_type(hdr, TIPC_DIRECT_MSG);
1495 msg_set_lookup_scope(hdr, 0);
1496 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1497 }
1498
1499 /* Add message body */
1500 __skb_queue_head_init(&pkts);
1501 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
1502 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1503 if (unlikely(rc != dlen))
1504 return rc;
1505 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1506 __skb_queue_purge(&pkts);
1507 return -ENOMEM;
1508 }
1509
1510 /* Send message */
1511 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1512 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid);
1513 if (unlikely(rc == -ELINKCONG)) {
1514 tipc_dest_push(clinks, skaddr.node, 0);
1515 tsk->cong_link_cnt++;
1516 rc = 0;
1517 }
1518
1519 if (unlikely(syn && !rc)) {
1520 tipc_set_sk_state(sk, TIPC_CONNECTING);
1521 if (dlen && timeout) {
1522 timeout = msecs_to_jiffies(timeout);
1523 tipc_wait_for_connect(sock, &timeout);
1524 }
1525 }
1526
1527 return rc ? rc : dlen;
1528}
1529
1530/**
1531 * tipc_sendstream - send stream-oriented data
1532 * @sock: socket structure
1533 * @m: data to send
1534 * @dsz: total length of data to be transmitted
1535 *
1536 * Used for SOCK_STREAM data.
1537 *
1538 * Return: the number of bytes sent on success (or partial success),
1539 * or errno if no data sent
1540 */
1541static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1542{
1543 struct sock *sk = sock->sk;
1544 int ret;
1545
1546 lock_sock(sk);
1547 ret = __tipc_sendstream(sock, m, dsz);
1548 release_sock(sk);
1549
1550 return ret;
1551}
1552
1553static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1554{
1555 struct sock *sk = sock->sk;
1556 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1557 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1558 struct sk_buff_head *txq = &sk->sk_write_queue;
1559 struct tipc_sock *tsk = tipc_sk(sk);
1560 struct tipc_msg *hdr = &tsk->phdr;
1561 struct net *net = sock_net(sk);
1562 struct sk_buff *skb;
1563 u32 dnode = tsk_peer_node(tsk);
1564 int maxnagle = tsk->maxnagle;
1565 int maxpkt = tsk->max_pkt;
1566 int send, sent = 0;
1567 int blocks, rc = 0;
1568
1569 if (unlikely(dlen > INT_MAX))
1570 return -EMSGSIZE;
1571
1572 /* Handle implicit connection setup */
1573 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) {
1574 rc = __tipc_sendmsg(sock, m, dlen);
1575 if (dlen && dlen == rc) {
1576 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1577 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1578 }
1579 return rc;
1580 }
1581
1582 do {
1583 rc = tipc_wait_for_cond(sock, &timeout,
1584 (!tsk->cong_link_cnt &&
1585 !tsk_conn_cong(tsk) &&
1586 tipc_sk_connected(sk)));
1587 if (unlikely(rc))
1588 break;
1589 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1590 blocks = tsk->snd_backlog;
1591 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1592 send <= maxnagle) {
1593 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1594 if (unlikely(rc < 0))
1595 break;
1596 blocks += rc;
1597 tsk->msg_acc++;
1598 if (blocks <= 64 && tsk->expect_ack) {
1599 tsk->snd_backlog = blocks;
1600 sent += send;
1601 break;
1602 } else if (blocks > 64) {
1603 tsk->pkt_cnt += skb_queue_len(txq);
1604 } else {
1605 skb = skb_peek_tail(txq);
1606 if (skb) {
1607 msg_set_ack_required(buf_msg(skb));
1608 tsk->expect_ack = true;
1609 } else {
1610 tsk->expect_ack = false;
1611 }
1612 tsk->msg_acc = 0;
1613 tsk->pkt_cnt = 0;
1614 }
1615 } else {
1616 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1617 if (unlikely(rc != send))
1618 break;
1619 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1620 }
1621 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1622 TIPC_DUMP_SK_SNDQ, " ");
1623 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1624 if (unlikely(rc == -ELINKCONG)) {
1625 tsk->cong_link_cnt = 1;
1626 rc = 0;
1627 }
1628 if (likely(!rc)) {
1629 tsk->snt_unacked += blocks;
1630 tsk->snd_backlog = 0;
1631 sent += send;
1632 }
1633 } while (sent < dlen && !rc);
1634
1635 return sent ? sent : rc;
1636}
1637
1638/**
1639 * tipc_send_packet - send a connection-oriented message
1640 * @sock: socket structure
1641 * @m: message to send
1642 * @dsz: length of data to be transmitted
1643 *
1644 * Used for SOCK_SEQPACKET messages.
1645 *
1646 * Return: the number of bytes sent on success, or errno otherwise
1647 */
1648static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1649{
1650 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1651 return -EMSGSIZE;
1652
1653 return tipc_sendstream(sock, m, dsz);
1654}
1655
1656/* tipc_sk_finish_conn - complete the setup of a connection
1657 */
1658static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1659 u32 peer_node)
1660{
1661 struct sock *sk = &tsk->sk;
1662 struct net *net = sock_net(sk);
1663 struct tipc_msg *msg = &tsk->phdr;
1664
1665 msg_set_syn(msg, 0);
1666 msg_set_destnode(msg, peer_node);
1667 msg_set_destport(msg, peer_port);
1668 msg_set_type(msg, TIPC_CONN_MSG);
1669 msg_set_lookup_scope(msg, 0);
1670 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1671
1672 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1673 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1674 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1675 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1676 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1677 tsk_set_nagle(tsk);
1678 __skb_queue_purge(&sk->sk_write_queue);
1679 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1680 return;
1681
1682 /* Fall back to message based flow control */
1683 tsk->rcv_win = FLOWCTL_MSG_WIN;
1684 tsk->snd_win = FLOWCTL_MSG_WIN;
1685}
1686
1687/**
1688 * tipc_sk_set_orig_addr - capture sender's address for received message
1689 * @m: descriptor for message info
1690 * @skb: received message
1691 *
1692 * Note: Address is not captured if not requested by receiver.
1693 */
1694static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1695{
1696 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1697 struct tipc_msg *hdr = buf_msg(skb);
1698
1699 if (!srcaddr)
1700 return;
1701
1702 srcaddr->sock.family = AF_TIPC;
1703 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1704 srcaddr->sock.scope = 0;
1705 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1706 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1707 srcaddr->sock.addr.name.domain = 0;
1708 m->msg_namelen = sizeof(struct sockaddr_tipc);
1709
1710 if (!msg_in_group(hdr))
1711 return;
1712
1713 /* Group message users may also want to know sending member's id */
1714 srcaddr->member.family = AF_TIPC;
1715 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1716 srcaddr->member.scope = 0;
1717 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1718 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1719 srcaddr->member.addr.name.domain = 0;
1720 m->msg_namelen = sizeof(*srcaddr);
1721}
1722
1723/**
1724 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1725 * @m: descriptor for message info
1726 * @skb: received message buffer
1727 * @tsk: TIPC port associated with message
1728 *
1729 * Note: Ancillary data is not captured if not requested by receiver.
1730 *
1731 * Return: 0 if successful, otherwise errno
1732 */
1733static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1734 struct tipc_sock *tsk)
1735{
1736 struct tipc_msg *hdr;
1737 u32 data[3] = {0,};
1738 bool has_addr;
1739 int dlen, rc;
1740
1741 if (likely(m->msg_controllen == 0))
1742 return 0;
1743
1744 hdr = buf_msg(skb);
1745 dlen = msg_data_sz(hdr);
1746
1747 /* Capture errored message object, if any */
1748 if (msg_errcode(hdr)) {
1749 if (skb_linearize(skb))
1750 return -ENOMEM;
1751 hdr = buf_msg(skb);
1752 data[0] = msg_errcode(hdr);
1753 data[1] = dlen;
1754 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1755 if (rc || !dlen)
1756 return rc;
1757 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1758 if (rc)
1759 return rc;
1760 }
1761
1762 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1763 switch (msg_type(hdr)) {
1764 case TIPC_NAMED_MSG:
1765 has_addr = true;
1766 data[0] = msg_nametype(hdr);
1767 data[1] = msg_namelower(hdr);
1768 data[2] = data[1];
1769 break;
1770 case TIPC_MCAST_MSG:
1771 has_addr = true;
1772 data[0] = msg_nametype(hdr);
1773 data[1] = msg_namelower(hdr);
1774 data[2] = msg_nameupper(hdr);
1775 break;
1776 case TIPC_CONN_MSG:
1777 has_addr = !!tsk->conn_addrtype;
1778 data[0] = msg_nametype(&tsk->phdr);
1779 data[1] = msg_nameinst(&tsk->phdr);
1780 data[2] = data[1];
1781 break;
1782 default:
1783 has_addr = false;
1784 }
1785 if (!has_addr)
1786 return 0;
1787 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1788}
1789
1790static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1791{
1792 struct sock *sk = &tsk->sk;
1793 struct sk_buff *skb = NULL;
1794 struct tipc_msg *msg;
1795 u32 peer_port = tsk_peer_port(tsk);
1796 u32 dnode = tsk_peer_node(tsk);
1797
1798 if (!tipc_sk_connected(sk))
1799 return NULL;
1800 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1801 dnode, tsk_own_node(tsk), peer_port,
1802 tsk->portid, TIPC_OK);
1803 if (!skb)
1804 return NULL;
1805 msg = buf_msg(skb);
1806 msg_set_conn_ack(msg, tsk->rcv_unacked);
1807 tsk->rcv_unacked = 0;
1808
1809 /* Adjust to and advertize the correct window limit */
1810 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1811 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1812 msg_set_adv_win(msg, tsk->rcv_win);
1813 }
1814 return skb;
1815}
1816
1817static void tipc_sk_send_ack(struct tipc_sock *tsk)
1818{
1819 struct sk_buff *skb;
1820
1821 skb = tipc_sk_build_ack(tsk);
1822 if (!skb)
1823 return;
1824
1825 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1826 msg_link_selector(buf_msg(skb)));
1827}
1828
1829static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1830{
1831 struct sock *sk = sock->sk;
1832 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1833 long timeo = *timeop;
1834 int err = sock_error(sk);
1835
1836 if (err)
1837 return err;
1838
1839 for (;;) {
1840 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1841 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1842 err = -ENOTCONN;
1843 break;
1844 }
1845 add_wait_queue(sk_sleep(sk), &wait);
1846 release_sock(sk);
1847 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1848 sched_annotate_sleep();
1849 lock_sock(sk);
1850 remove_wait_queue(sk_sleep(sk), &wait);
1851 }
1852 err = 0;
1853 if (!skb_queue_empty(&sk->sk_receive_queue))
1854 break;
1855 err = -EAGAIN;
1856 if (!timeo)
1857 break;
1858 err = sock_intr_errno(timeo);
1859 if (signal_pending(current))
1860 break;
1861
1862 err = sock_error(sk);
1863 if (err)
1864 break;
1865 }
1866 *timeop = timeo;
1867 return err;
1868}
1869
1870/**
1871 * tipc_recvmsg - receive packet-oriented message
1872 * @sock: network socket
1873 * @m: descriptor for message info
1874 * @buflen: length of user buffer area
1875 * @flags: receive flags
1876 *
1877 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1878 * If the complete message doesn't fit in user area, truncate it.
1879 *
1880 * Return: size of returned message data, errno otherwise
1881 */
1882static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1883 size_t buflen, int flags)
1884{
1885 struct sock *sk = sock->sk;
1886 bool connected = !tipc_sk_type_connectionless(sk);
1887 struct tipc_sock *tsk = tipc_sk(sk);
1888 int rc, err, hlen, dlen, copy;
1889 struct tipc_skb_cb *skb_cb;
1890 struct sk_buff_head xmitq;
1891 struct tipc_msg *hdr;
1892 struct sk_buff *skb;
1893 bool grp_evt;
1894 long timeout;
1895
1896 /* Catch invalid receive requests */
1897 if (unlikely(!buflen))
1898 return -EINVAL;
1899
1900 lock_sock(sk);
1901 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1902 rc = -ENOTCONN;
1903 goto exit;
1904 }
1905 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1906
1907 /* Step rcv queue to first msg with data or error; wait if necessary */
1908 do {
1909 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1910 if (unlikely(rc))
1911 goto exit;
1912 skb = skb_peek(&sk->sk_receive_queue);
1913 skb_cb = TIPC_SKB_CB(skb);
1914 hdr = buf_msg(skb);
1915 dlen = msg_data_sz(hdr);
1916 hlen = msg_hdr_sz(hdr);
1917 err = msg_errcode(hdr);
1918 grp_evt = msg_is_grp_evt(hdr);
1919 if (likely(dlen || err))
1920 break;
1921 tsk_advance_rx_queue(sk);
1922 } while (1);
1923
1924 /* Collect msg meta data, including error code and rejected data */
1925 tipc_sk_set_orig_addr(m, skb);
1926 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1927 if (unlikely(rc))
1928 goto exit;
1929 hdr = buf_msg(skb);
1930
1931 /* Capture data if non-error msg, otherwise just set return value */
1932 if (likely(!err)) {
1933 int offset = skb_cb->bytes_read;
1934
1935 copy = min_t(int, dlen - offset, buflen);
1936 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1937 if (unlikely(rc))
1938 goto exit;
1939 if (unlikely(offset + copy < dlen)) {
1940 if (flags & MSG_EOR) {
1941 if (!(flags & MSG_PEEK))
1942 skb_cb->bytes_read = offset + copy;
1943 } else {
1944 m->msg_flags |= MSG_TRUNC;
1945 skb_cb->bytes_read = 0;
1946 }
1947 } else {
1948 if (flags & MSG_EOR)
1949 m->msg_flags |= MSG_EOR;
1950 skb_cb->bytes_read = 0;
1951 }
1952 } else {
1953 copy = 0;
1954 rc = 0;
1955 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) {
1956 rc = -ECONNRESET;
1957 goto exit;
1958 }
1959 }
1960
1961 /* Mark message as group event if applicable */
1962 if (unlikely(grp_evt)) {
1963 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1964 m->msg_flags |= MSG_EOR;
1965 m->msg_flags |= MSG_OOB;
1966 copy = 0;
1967 }
1968
1969 /* Caption of data or error code/rejected data was successful */
1970 if (unlikely(flags & MSG_PEEK))
1971 goto exit;
1972
1973 /* Send group flow control advertisement when applicable */
1974 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1975 __skb_queue_head_init(&xmitq);
1976 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1977 msg_orignode(hdr), msg_origport(hdr),
1978 &xmitq);
1979 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1980 }
1981
1982 if (skb_cb->bytes_read)
1983 goto exit;
1984
1985 tsk_advance_rx_queue(sk);
1986
1987 if (likely(!connected))
1988 goto exit;
1989
1990 /* Send connection flow control advertisement when applicable */
1991 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1992 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1993 tipc_sk_send_ack(tsk);
1994exit:
1995 release_sock(sk);
1996 return rc ? rc : copy;
1997}
1998
1999/**
2000 * tipc_recvstream - receive stream-oriented data
2001 * @sock: network socket
2002 * @m: descriptor for message info
2003 * @buflen: total size of user buffer area
2004 * @flags: receive flags
2005 *
2006 * Used for SOCK_STREAM messages only. If not enough data is available
2007 * will optionally wait for more; never truncates data.
2008 *
2009 * Return: size of returned message data, errno otherwise
2010 */
2011static int tipc_recvstream(struct socket *sock, struct msghdr *m,
2012 size_t buflen, int flags)
2013{
2014 struct sock *sk = sock->sk;
2015 struct tipc_sock *tsk = tipc_sk(sk);
2016 struct sk_buff *skb;
2017 struct tipc_msg *hdr;
2018 struct tipc_skb_cb *skb_cb;
2019 bool peek = flags & MSG_PEEK;
2020 int offset, required, copy, copied = 0;
2021 int hlen, dlen, err, rc;
2022 long timeout;
2023
2024 /* Catch invalid receive attempts */
2025 if (unlikely(!buflen))
2026 return -EINVAL;
2027
2028 lock_sock(sk);
2029
2030 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2031 rc = -ENOTCONN;
2032 goto exit;
2033 }
2034 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2035 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2036
2037 do {
2038 /* Look at first msg in receive queue; wait if necessary */
2039 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2040 if (unlikely(rc))
2041 break;
2042 skb = skb_peek(&sk->sk_receive_queue);
2043 skb_cb = TIPC_SKB_CB(skb);
2044 hdr = buf_msg(skb);
2045 dlen = msg_data_sz(hdr);
2046 hlen = msg_hdr_sz(hdr);
2047 err = msg_errcode(hdr);
2048
2049 /* Discard any empty non-errored (SYN-) message */
2050 if (unlikely(!dlen && !err)) {
2051 tsk_advance_rx_queue(sk);
2052 continue;
2053 }
2054
2055 /* Collect msg meta data, incl. error code and rejected data */
2056 if (!copied) {
2057 tipc_sk_set_orig_addr(m, skb);
2058 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2059 if (rc)
2060 break;
2061 hdr = buf_msg(skb);
2062 }
2063
2064 /* Copy data if msg ok, otherwise return error/partial data */
2065 if (likely(!err)) {
2066 offset = skb_cb->bytes_read;
2067 copy = min_t(int, dlen - offset, buflen - copied);
2068 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2069 if (unlikely(rc))
2070 break;
2071 copied += copy;
2072 offset += copy;
2073 if (unlikely(offset < dlen)) {
2074 if (!peek)
2075 skb_cb->bytes_read = offset;
2076 break;
2077 }
2078 } else {
2079 rc = 0;
2080 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2081 rc = -ECONNRESET;
2082 if (copied || rc)
2083 break;
2084 }
2085
2086 if (unlikely(peek))
2087 break;
2088
2089 tsk_advance_rx_queue(sk);
2090
2091 /* Send connection flow control advertisement when applicable */
2092 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2093 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2094 tipc_sk_send_ack(tsk);
2095
2096 /* Exit if all requested data or FIN/error received */
2097 if (copied == buflen || err)
2098 break;
2099
2100 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2101exit:
2102 release_sock(sk);
2103 return copied ? copied : rc;
2104}
2105
2106/**
2107 * tipc_write_space - wake up thread if port congestion is released
2108 * @sk: socket
2109 */
2110static void tipc_write_space(struct sock *sk)
2111{
2112 struct socket_wq *wq;
2113
2114 rcu_read_lock();
2115 wq = rcu_dereference(sk->sk_wq);
2116 if (skwq_has_sleeper(wq))
2117 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2118 EPOLLWRNORM | EPOLLWRBAND);
2119 rcu_read_unlock();
2120}
2121
2122/**
2123 * tipc_data_ready - wake up threads to indicate messages have been received
2124 * @sk: socket
2125 */
2126static void tipc_data_ready(struct sock *sk)
2127{
2128 struct socket_wq *wq;
2129
2130 rcu_read_lock();
2131 wq = rcu_dereference(sk->sk_wq);
2132 if (skwq_has_sleeper(wq))
2133 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2134 EPOLLRDNORM | EPOLLRDBAND);
2135 rcu_read_unlock();
2136}
2137
2138static void tipc_sock_destruct(struct sock *sk)
2139{
2140 __skb_queue_purge(&sk->sk_receive_queue);
2141}
2142
2143static void tipc_sk_proto_rcv(struct sock *sk,
2144 struct sk_buff_head *inputq,
2145 struct sk_buff_head *xmitq)
2146{
2147 struct sk_buff *skb = __skb_dequeue(inputq);
2148 struct tipc_sock *tsk = tipc_sk(sk);
2149 struct tipc_msg *hdr = buf_msg(skb);
2150 struct tipc_group *grp = tsk->group;
2151 bool wakeup = false;
2152
2153 switch (msg_user(hdr)) {
2154 case CONN_MANAGER:
2155 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2156 return;
2157 case SOCK_WAKEUP:
2158 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2159 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2160 smp_wmb();
2161 tsk->cong_link_cnt--;
2162 wakeup = true;
2163 tipc_sk_push_backlog(tsk, false);
2164 break;
2165 case GROUP_PROTOCOL:
2166 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2167 break;
2168 case TOP_SRV:
2169 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2170 hdr, inputq, xmitq);
2171 break;
2172 default:
2173 break;
2174 }
2175
2176 if (wakeup)
2177 sk->sk_write_space(sk);
2178
2179 kfree_skb(skb);
2180}
2181
2182/**
2183 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2184 * @tsk: TIPC socket
2185 * @skb: pointer to message buffer.
2186 * @xmitq: for Nagle ACK if any
2187 * Return: true if message should be added to receive queue, false otherwise
2188 */
2189static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2190 struct sk_buff_head *xmitq)
2191{
2192 struct sock *sk = &tsk->sk;
2193 struct net *net = sock_net(sk);
2194 struct tipc_msg *hdr = buf_msg(skb);
2195 bool con_msg = msg_connected(hdr);
2196 u32 pport = tsk_peer_port(tsk);
2197 u32 pnode = tsk_peer_node(tsk);
2198 u32 oport = msg_origport(hdr);
2199 u32 onode = msg_orignode(hdr);
2200 int err = msg_errcode(hdr);
2201 unsigned long delay;
2202
2203 if (unlikely(msg_mcast(hdr)))
2204 return false;
2205 tsk->oneway = 0;
2206
2207 switch (sk->sk_state) {
2208 case TIPC_CONNECTING:
2209 /* Setup ACK */
2210 if (likely(con_msg)) {
2211 if (err)
2212 break;
2213 tipc_sk_finish_conn(tsk, oport, onode);
2214 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2215 /* ACK+ message with data is added to receive queue */
2216 if (msg_data_sz(hdr))
2217 return true;
2218 /* Empty ACK-, - wake up sleeping connect() and drop */
2219 sk->sk_state_change(sk);
2220 msg_set_dest_droppable(hdr, 1);
2221 return false;
2222 }
2223 /* Ignore connectionless message if not from listening socket */
2224 if (oport != pport || onode != pnode)
2225 return false;
2226
2227 /* Rejected SYN */
2228 if (err != TIPC_ERR_OVERLOAD)
2229 break;
2230
2231 /* Prepare for new setup attempt if we have a SYN clone */
2232 if (skb_queue_empty(&sk->sk_write_queue))
2233 break;
2234 get_random_bytes(&delay, 2);
2235 delay %= (tsk->conn_timeout / 4);
2236 delay = msecs_to_jiffies(delay + 100);
2237 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2238 return false;
2239 case TIPC_OPEN:
2240 case TIPC_DISCONNECTING:
2241 return false;
2242 case TIPC_LISTEN:
2243 /* Accept only SYN message */
2244 if (!msg_is_syn(hdr) &&
2245 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2246 return false;
2247 if (!con_msg && !err)
2248 return true;
2249 return false;
2250 case TIPC_ESTABLISHED:
2251 if (!skb_queue_empty(&sk->sk_write_queue))
2252 tipc_sk_push_backlog(tsk, false);
2253 /* Accept only connection-based messages sent by peer */
2254 if (likely(con_msg && !err && pport == oport &&
2255 pnode == onode)) {
2256 if (msg_ack_required(hdr)) {
2257 struct sk_buff *skb;
2258
2259 skb = tipc_sk_build_ack(tsk);
2260 if (skb) {
2261 msg_set_nagle_ack(buf_msg(skb));
2262 __skb_queue_tail(xmitq, skb);
2263 }
2264 }
2265 return true;
2266 }
2267 if (!tsk_peer_msg(tsk, hdr))
2268 return false;
2269 if (!err)
2270 return true;
2271 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2272 tipc_node_remove_conn(net, pnode, tsk->portid);
2273 sk->sk_state_change(sk);
2274 return true;
2275 default:
2276 pr_err("Unknown sk_state %u\n", sk->sk_state);
2277 }
2278 /* Abort connection setup attempt */
2279 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2280 sk->sk_err = ECONNREFUSED;
2281 sk->sk_state_change(sk);
2282 return true;
2283}
2284
2285/**
2286 * rcvbuf_limit - get proper overload limit of socket receive queue
2287 * @sk: socket
2288 * @skb: message
2289 *
2290 * For connection oriented messages, irrespective of importance,
2291 * default queue limit is 2 MB.
2292 *
2293 * For connectionless messages, queue limits are based on message
2294 * importance as follows:
2295 *
2296 * TIPC_LOW_IMPORTANCE (2 MB)
2297 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2298 * TIPC_HIGH_IMPORTANCE (8 MB)
2299 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2300 *
2301 * Return: overload limit according to corresponding message importance
2302 */
2303static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2304{
2305 struct tipc_sock *tsk = tipc_sk(sk);
2306 struct tipc_msg *hdr = buf_msg(skb);
2307
2308 if (unlikely(msg_in_group(hdr)))
2309 return READ_ONCE(sk->sk_rcvbuf);
2310
2311 if (unlikely(!msg_connected(hdr)))
2312 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2313
2314 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2315 return READ_ONCE(sk->sk_rcvbuf);
2316
2317 return FLOWCTL_MSG_LIM;
2318}
2319
2320/**
2321 * tipc_sk_filter_rcv - validate incoming message
2322 * @sk: socket
2323 * @skb: pointer to message.
2324 * @xmitq: output message area (FIXME)
2325 *
2326 * Enqueues message on receive queue if acceptable; optionally handles
2327 * disconnect indication for a connected socket.
2328 *
2329 * Called with socket lock already taken
2330 */
2331static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2332 struct sk_buff_head *xmitq)
2333{
2334 bool sk_conn = !tipc_sk_type_connectionless(sk);
2335 struct tipc_sock *tsk = tipc_sk(sk);
2336 struct tipc_group *grp = tsk->group;
2337 struct tipc_msg *hdr = buf_msg(skb);
2338 struct net *net = sock_net(sk);
2339 struct sk_buff_head inputq;
2340 int mtyp = msg_type(hdr);
2341 int limit, err = TIPC_OK;
2342
2343 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2344 TIPC_SKB_CB(skb)->bytes_read = 0;
2345 __skb_queue_head_init(&inputq);
2346 __skb_queue_tail(&inputq, skb);
2347
2348 if (unlikely(!msg_isdata(hdr)))
2349 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2350
2351 if (unlikely(grp))
2352 tipc_group_filter_msg(grp, &inputq, xmitq);
2353
2354 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2355 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2356
2357 /* Validate and add to receive buffer if there is space */
2358 while ((skb = __skb_dequeue(&inputq))) {
2359 hdr = buf_msg(skb);
2360 limit = rcvbuf_limit(sk, skb);
2361 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2362 (!sk_conn && msg_connected(hdr)) ||
2363 (!grp && msg_in_group(hdr)))
2364 err = TIPC_ERR_NO_PORT;
2365 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2366 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2367 "err_overload2!");
2368 atomic_inc(&sk->sk_drops);
2369 err = TIPC_ERR_OVERLOAD;
2370 }
2371
2372 if (unlikely(err)) {
2373 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2374 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2375 "@filter_rcv!");
2376 __skb_queue_tail(xmitq, skb);
2377 }
2378 err = TIPC_OK;
2379 continue;
2380 }
2381 __skb_queue_tail(&sk->sk_receive_queue, skb);
2382 skb_set_owner_r(skb, sk);
2383 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2384 "rcvq >90% allocated!");
2385 sk->sk_data_ready(sk);
2386 }
2387}
2388
2389/**
2390 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2391 * @sk: socket
2392 * @skb: message
2393 *
2394 * Caller must hold socket lock
2395 */
2396static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2397{
2398 unsigned int before = sk_rmem_alloc_get(sk);
2399 struct sk_buff_head xmitq;
2400 unsigned int added;
2401
2402 __skb_queue_head_init(&xmitq);
2403
2404 tipc_sk_filter_rcv(sk, skb, &xmitq);
2405 added = sk_rmem_alloc_get(sk) - before;
2406 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2407
2408 /* Send pending response/rejected messages, if any */
2409 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2410 return 0;
2411}
2412
2413/**
2414 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2415 * inputq and try adding them to socket or backlog queue
2416 * @inputq: list of incoming buffers with potentially different destinations
2417 * @sk: socket where the buffers should be enqueued
2418 * @dport: port number for the socket
2419 * @xmitq: output queue
2420 *
2421 * Caller must hold socket lock
2422 */
2423static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2424 u32 dport, struct sk_buff_head *xmitq)
2425{
2426 unsigned long time_limit = jiffies + usecs_to_jiffies(20000);
2427 struct sk_buff *skb;
2428 unsigned int lim;
2429 atomic_t *dcnt;
2430 u32 onode;
2431
2432 while (skb_queue_len(inputq)) {
2433 if (unlikely(time_after_eq(jiffies, time_limit)))
2434 return;
2435
2436 skb = tipc_skb_dequeue(inputq, dport);
2437 if (unlikely(!skb))
2438 return;
2439
2440 /* Add message directly to receive queue if possible */
2441 if (!sock_owned_by_user(sk)) {
2442 tipc_sk_filter_rcv(sk, skb, xmitq);
2443 continue;
2444 }
2445
2446 /* Try backlog, compensating for double-counted bytes */
2447 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2448 if (!sk->sk_backlog.len)
2449 atomic_set(dcnt, 0);
2450 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2451 if (likely(!sk_add_backlog(sk, skb, lim))) {
2452 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2453 "bklg & rcvq >90% allocated!");
2454 continue;
2455 }
2456
2457 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2458 /* Overload => reject message back to sender */
2459 onode = tipc_own_addr(sock_net(sk));
2460 atomic_inc(&sk->sk_drops);
2461 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2462 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2463 "@sk_enqueue!");
2464 __skb_queue_tail(xmitq, skb);
2465 }
2466 break;
2467 }
2468}
2469
2470/**
2471 * tipc_sk_rcv - handle a chain of incoming buffers
2472 * @net: the associated network namespace
2473 * @inputq: buffer list containing the buffers
2474 * Consumes all buffers in list until inputq is empty
2475 * Note: may be called in multiple threads referring to the same queue
2476 */
2477void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2478{
2479 struct sk_buff_head xmitq;
2480 u32 dnode, dport = 0;
2481 int err;
2482 struct tipc_sock *tsk;
2483 struct sock *sk;
2484 struct sk_buff *skb;
2485
2486 __skb_queue_head_init(&xmitq);
2487 while (skb_queue_len(inputq)) {
2488 dport = tipc_skb_peek_port(inputq, dport);
2489 tsk = tipc_sk_lookup(net, dport);
2490
2491 if (likely(tsk)) {
2492 sk = &tsk->sk;
2493 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2494 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2495 spin_unlock_bh(&sk->sk_lock.slock);
2496 }
2497 /* Send pending response/rejected messages, if any */
2498 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2499 sock_put(sk);
2500 continue;
2501 }
2502 /* No destination socket => dequeue skb if still there */
2503 skb = tipc_skb_dequeue(inputq, dport);
2504 if (!skb)
2505 return;
2506
2507 /* Try secondary lookup if unresolved named message */
2508 err = TIPC_ERR_NO_PORT;
2509 if (tipc_msg_lookup_dest(net, skb, &err))
2510 goto xmit;
2511
2512 /* Prepare for message rejection */
2513 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2514 continue;
2515
2516 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2517xmit:
2518 dnode = msg_destnode(buf_msg(skb));
2519 tipc_node_xmit_skb(net, skb, dnode, dport);
2520 }
2521}
2522
2523static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2524{
2525 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2526 struct sock *sk = sock->sk;
2527 int done;
2528
2529 do {
2530 int err = sock_error(sk);
2531 if (err)
2532 return err;
2533 if (!*timeo_p)
2534 return -ETIMEDOUT;
2535 if (signal_pending(current))
2536 return sock_intr_errno(*timeo_p);
2537 if (sk->sk_state == TIPC_DISCONNECTING)
2538 break;
2539
2540 add_wait_queue(sk_sleep(sk), &wait);
2541 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2542 &wait);
2543 remove_wait_queue(sk_sleep(sk), &wait);
2544 } while (!done);
2545 return 0;
2546}
2547
2548static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2549{
2550 if (addr->family != AF_TIPC)
2551 return false;
2552 if (addr->addrtype == TIPC_SERVICE_RANGE)
2553 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2554 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2555 addr->addrtype == TIPC_SOCKET_ADDR);
2556}
2557
2558/**
2559 * tipc_connect - establish a connection to another TIPC port
2560 * @sock: socket structure
2561 * @dest: socket address for destination port
2562 * @destlen: size of socket address data structure
2563 * @flags: file-related flags associated with socket
2564 *
2565 * Return: 0 on success, errno otherwise
2566 */
2567static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2568 int destlen, int flags)
2569{
2570 struct sock *sk = sock->sk;
2571 struct tipc_sock *tsk = tipc_sk(sk);
2572 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2573 struct msghdr m = {NULL,};
2574 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2575 int previous;
2576 int res = 0;
2577
2578 if (destlen != sizeof(struct sockaddr_tipc))
2579 return -EINVAL;
2580
2581 lock_sock(sk);
2582
2583 if (tsk->group) {
2584 res = -EINVAL;
2585 goto exit;
2586 }
2587
2588 if (dst->family == AF_UNSPEC) {
2589 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2590 if (!tipc_sk_type_connectionless(sk))
2591 res = -EINVAL;
2592 goto exit;
2593 }
2594 if (!tipc_sockaddr_is_sane(dst)) {
2595 res = -EINVAL;
2596 goto exit;
2597 }
2598 /* DGRAM/RDM connect(), just save the destaddr */
2599 if (tipc_sk_type_connectionless(sk)) {
2600 memcpy(&tsk->peer, dest, destlen);
2601 goto exit;
2602 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2603 res = -EINVAL;
2604 goto exit;
2605 }
2606
2607 previous = sk->sk_state;
2608
2609 switch (sk->sk_state) {
2610 case TIPC_OPEN:
2611 /* Send a 'SYN-' to destination */
2612 m.msg_name = dest;
2613 m.msg_namelen = destlen;
2614
2615 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2616 * indicate send_msg() is never blocked.
2617 */
2618 if (!timeout)
2619 m.msg_flags = MSG_DONTWAIT;
2620
2621 res = __tipc_sendmsg(sock, &m, 0);
2622 if ((res < 0) && (res != -EWOULDBLOCK))
2623 goto exit;
2624
2625 /* Just entered TIPC_CONNECTING state; the only
2626 * difference is that return value in non-blocking
2627 * case is EINPROGRESS, rather than EALREADY.
2628 */
2629 res = -EINPROGRESS;
2630 fallthrough;
2631 case TIPC_CONNECTING:
2632 if (!timeout) {
2633 if (previous == TIPC_CONNECTING)
2634 res = -EALREADY;
2635 goto exit;
2636 }
2637 timeout = msecs_to_jiffies(timeout);
2638 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2639 res = tipc_wait_for_connect(sock, &timeout);
2640 break;
2641 case TIPC_ESTABLISHED:
2642 res = -EISCONN;
2643 break;
2644 default:
2645 res = -EINVAL;
2646 }
2647
2648exit:
2649 release_sock(sk);
2650 return res;
2651}
2652
2653/**
2654 * tipc_listen - allow socket to listen for incoming connections
2655 * @sock: socket structure
2656 * @len: (unused)
2657 *
2658 * Return: 0 on success, errno otherwise
2659 */
2660static int tipc_listen(struct socket *sock, int len)
2661{
2662 struct sock *sk = sock->sk;
2663 int res;
2664
2665 lock_sock(sk);
2666 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2667 release_sock(sk);
2668
2669 return res;
2670}
2671
2672static int tipc_wait_for_accept(struct socket *sock, long timeo)
2673{
2674 struct sock *sk = sock->sk;
2675 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2676 int err;
2677
2678 /* True wake-one mechanism for incoming connections: only
2679 * one process gets woken up, not the 'whole herd'.
2680 * Since we do not 'race & poll' for established sockets
2681 * anymore, the common case will execute the loop only once.
2682 */
2683 for (;;) {
2684 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2685 add_wait_queue(sk_sleep(sk), &wait);
2686 release_sock(sk);
2687 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
2688 lock_sock(sk);
2689 remove_wait_queue(sk_sleep(sk), &wait);
2690 }
2691 err = 0;
2692 if (!skb_queue_empty(&sk->sk_receive_queue))
2693 break;
2694 err = -EAGAIN;
2695 if (!timeo)
2696 break;
2697 err = sock_intr_errno(timeo);
2698 if (signal_pending(current))
2699 break;
2700 }
2701 return err;
2702}
2703
2704/**
2705 * tipc_accept - wait for connection request
2706 * @sock: listening socket
2707 * @new_sock: new socket that is to be connected
2708 * @flags: file-related flags associated with socket
2709 * @kern: caused by kernel or by userspace?
2710 *
2711 * Return: 0 on success, errno otherwise
2712 */
2713static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2714 bool kern)
2715{
2716 struct sock *new_sk, *sk = sock->sk;
2717 struct tipc_sock *new_tsock;
2718 struct msghdr m = {NULL,};
2719 struct tipc_msg *msg;
2720 struct sk_buff *buf;
2721 long timeo;
2722 int res;
2723
2724 lock_sock(sk);
2725
2726 if (sk->sk_state != TIPC_LISTEN) {
2727 res = -EINVAL;
2728 goto exit;
2729 }
2730 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2731 res = tipc_wait_for_accept(sock, timeo);
2732 if (res)
2733 goto exit;
2734
2735 buf = skb_peek(&sk->sk_receive_queue);
2736
2737 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2738 if (res)
2739 goto exit;
2740 security_sk_clone(sock->sk, new_sock->sk);
2741
2742 new_sk = new_sock->sk;
2743 new_tsock = tipc_sk(new_sk);
2744 msg = buf_msg(buf);
2745
2746 /* we lock on new_sk; but lockdep sees the lock on sk */
2747 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2748
2749 /*
2750 * Reject any stray messages received by new socket
2751 * before the socket lock was taken (very, very unlikely)
2752 */
2753 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2754
2755 /* Connect new socket to it's peer */
2756 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2757
2758 tsk_set_importance(new_sk, msg_importance(msg));
2759 if (msg_named(msg)) {
2760 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2761 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2762 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2763 }
2764
2765 /*
2766 * Respond to 'SYN-' by discarding it & returning 'ACK'.
2767 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'.
2768 */
2769 if (!msg_data_sz(msg)) {
2770 tsk_advance_rx_queue(sk);
2771 } else {
2772 __skb_dequeue(&sk->sk_receive_queue);
2773 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2774 skb_set_owner_r(buf, new_sk);
2775 }
2776 __tipc_sendstream(new_sock, &m, 0);
2777 release_sock(new_sk);
2778exit:
2779 release_sock(sk);
2780 return res;
2781}
2782
2783/**
2784 * tipc_shutdown - shutdown socket connection
2785 * @sock: socket structure
2786 * @how: direction to close (must be SHUT_RDWR)
2787 *
2788 * Terminates connection (if necessary), then purges socket's receive queue.
2789 *
2790 * Return: 0 on success, errno otherwise
2791 */
2792static int tipc_shutdown(struct socket *sock, int how)
2793{
2794 struct sock *sk = sock->sk;
2795 int res;
2796
2797 if (how != SHUT_RDWR)
2798 return -EINVAL;
2799
2800 lock_sock(sk);
2801
2802 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2803 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2804 sk->sk_shutdown = SHUTDOWN_MASK;
2805
2806 if (sk->sk_state == TIPC_DISCONNECTING) {
2807 /* Discard any unreceived messages */
2808 __skb_queue_purge(&sk->sk_receive_queue);
2809
2810 res = 0;
2811 } else {
2812 res = -ENOTCONN;
2813 }
2814 /* Wake up anyone sleeping in poll. */
2815 sk->sk_state_change(sk);
2816
2817 release_sock(sk);
2818 return res;
2819}
2820
2821static void tipc_sk_check_probing_state(struct sock *sk,
2822 struct sk_buff_head *list)
2823{
2824 struct tipc_sock *tsk = tipc_sk(sk);
2825 u32 pnode = tsk_peer_node(tsk);
2826 u32 pport = tsk_peer_port(tsk);
2827 u32 self = tsk_own_node(tsk);
2828 u32 oport = tsk->portid;
2829 struct sk_buff *skb;
2830
2831 if (tsk->probe_unacked) {
2832 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2833 sk->sk_err = ECONNABORTED;
2834 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2835 sk->sk_state_change(sk);
2836 return;
2837 }
2838 /* Prepare new probe */
2839 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2840 pnode, self, pport, oport, TIPC_OK);
2841 if (skb)
2842 __skb_queue_tail(list, skb);
2843 tsk->probe_unacked = true;
2844 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2845}
2846
2847static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2848{
2849 struct tipc_sock *tsk = tipc_sk(sk);
2850
2851 /* Try again later if dest link is congested */
2852 if (tsk->cong_link_cnt) {
2853 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100));
2854 return;
2855 }
2856 /* Prepare SYN for retransmit */
2857 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2858}
2859
2860static void tipc_sk_timeout(struct timer_list *t)
2861{
2862 struct sock *sk = from_timer(sk, t, sk_timer);
2863 struct tipc_sock *tsk = tipc_sk(sk);
2864 u32 pnode = tsk_peer_node(tsk);
2865 struct sk_buff_head list;
2866 int rc = 0;
2867
2868 __skb_queue_head_init(&list);
2869 bh_lock_sock(sk);
2870
2871 /* Try again later if socket is busy */
2872 if (sock_owned_by_user(sk)) {
2873 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2874 bh_unlock_sock(sk);
2875 sock_put(sk);
2876 return;
2877 }
2878
2879 if (sk->sk_state == TIPC_ESTABLISHED)
2880 tipc_sk_check_probing_state(sk, &list);
2881 else if (sk->sk_state == TIPC_CONNECTING)
2882 tipc_sk_retry_connect(sk, &list);
2883
2884 bh_unlock_sock(sk);
2885
2886 if (!skb_queue_empty(&list))
2887 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2888
2889 /* SYN messages may cause link congestion */
2890 if (rc == -ELINKCONG) {
2891 tipc_dest_push(&tsk->cong_links, pnode, 0);
2892 tsk->cong_link_cnt = 1;
2893 }
2894 sock_put(sk);
2895}
2896
2897static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2898{
2899 struct sock *sk = &tsk->sk;
2900 struct net *net = sock_net(sk);
2901 struct tipc_socket_addr skaddr;
2902 struct publication *p;
2903 u32 key;
2904
2905 if (tipc_sk_connected(sk))
2906 return -EINVAL;
2907 key = tsk->portid + tsk->pub_count + 1;
2908 if (key == tsk->portid)
2909 return -EADDRINUSE;
2910 skaddr.ref = tsk->portid;
2911 skaddr.node = tipc_own_addr(net);
2912 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2913 if (unlikely(!p))
2914 return -EINVAL;
2915
2916 list_add(&p->binding_sock, &tsk->publications);
2917 tsk->pub_count++;
2918 tsk->published = true;
2919 return 0;
2920}
2921
2922static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2923{
2924 struct net *net = sock_net(&tsk->sk);
2925 struct publication *safe, *p;
2926 struct tipc_uaddr _ua;
2927 int rc = -EINVAL;
2928
2929 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2930 if (!ua) {
2931 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2932 p->sr.type, p->sr.lower, p->sr.upper);
2933 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2934 continue;
2935 }
2936 /* Unbind specific publication */
2937 if (p->scope != ua->scope)
2938 continue;
2939 if (p->sr.type != ua->sr.type)
2940 continue;
2941 if (p->sr.lower != ua->sr.lower)
2942 continue;
2943 if (p->sr.upper != ua->sr.upper)
2944 break;
2945 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2946 rc = 0;
2947 break;
2948 }
2949 if (list_empty(&tsk->publications)) {
2950 tsk->published = 0;
2951 rc = 0;
2952 }
2953 return rc;
2954}
2955
2956/* tipc_sk_reinit: set non-zero address in all existing sockets
2957 * when we go from standalone to network mode.
2958 */
2959void tipc_sk_reinit(struct net *net)
2960{
2961 struct tipc_net *tn = net_generic(net, tipc_net_id);
2962 struct rhashtable_iter iter;
2963 struct tipc_sock *tsk;
2964 struct tipc_msg *msg;
2965
2966 rhashtable_walk_enter(&tn->sk_rht, &iter);
2967
2968 do {
2969 rhashtable_walk_start(&iter);
2970
2971 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2972 sock_hold(&tsk->sk);
2973 rhashtable_walk_stop(&iter);
2974 lock_sock(&tsk->sk);
2975 msg = &tsk->phdr;
2976 msg_set_prevnode(msg, tipc_own_addr(net));
2977 msg_set_orignode(msg, tipc_own_addr(net));
2978 release_sock(&tsk->sk);
2979 rhashtable_walk_start(&iter);
2980 sock_put(&tsk->sk);
2981 }
2982
2983 rhashtable_walk_stop(&iter);
2984 } while (tsk == ERR_PTR(-EAGAIN));
2985
2986 rhashtable_walk_exit(&iter);
2987}
2988
2989static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2990{
2991 struct tipc_net *tn = net_generic(net, tipc_net_id);
2992 struct tipc_sock *tsk;
2993
2994 rcu_read_lock();
2995 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
2996 if (tsk)
2997 sock_hold(&tsk->sk);
2998 rcu_read_unlock();
2999
3000 return tsk;
3001}
3002
3003static int tipc_sk_insert(struct tipc_sock *tsk)
3004{
3005 struct sock *sk = &tsk->sk;
3006 struct net *net = sock_net(sk);
3007 struct tipc_net *tn = net_generic(net, tipc_net_id);
3008 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
3009 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
3010
3011 while (remaining--) {
3012 portid++;
3013 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
3014 portid = TIPC_MIN_PORT;
3015 tsk->portid = portid;
3016 sock_hold(&tsk->sk);
3017 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3018 tsk_rht_params))
3019 return 0;
3020 sock_put(&tsk->sk);
3021 }
3022
3023 return -1;
3024}
3025
3026static void tipc_sk_remove(struct tipc_sock *tsk)
3027{
3028 struct sock *sk = &tsk->sk;
3029 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3030
3031 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3032 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3033 __sock_put(sk);
3034 }
3035}
3036
3037static const struct rhashtable_params tsk_rht_params = {
3038 .nelem_hint = 192,
3039 .head_offset = offsetof(struct tipc_sock, node),
3040 .key_offset = offsetof(struct tipc_sock, portid),
3041 .key_len = sizeof(u32), /* portid */
3042 .max_size = 1048576,
3043 .min_size = 256,
3044 .automatic_shrinking = true,
3045};
3046
3047int tipc_sk_rht_init(struct net *net)
3048{
3049 struct tipc_net *tn = net_generic(net, tipc_net_id);
3050
3051 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3052}
3053
3054void tipc_sk_rht_destroy(struct net *net)
3055{
3056 struct tipc_net *tn = net_generic(net, tipc_net_id);
3057
3058 /* Wait for socket readers to complete */
3059 synchronize_net();
3060
3061 rhashtable_destroy(&tn->sk_rht);
3062}
3063
3064static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3065{
3066 struct net *net = sock_net(&tsk->sk);
3067 struct tipc_group *grp = tsk->group;
3068 struct tipc_msg *hdr = &tsk->phdr;
3069 struct tipc_uaddr ua;
3070 int rc;
3071
3072 if (mreq->type < TIPC_RESERVED_TYPES)
3073 return -EACCES;
3074 if (mreq->scope > TIPC_NODE_SCOPE)
3075 return -EINVAL;
3076 if (mreq->scope != TIPC_NODE_SCOPE)
3077 mreq->scope = TIPC_CLUSTER_SCOPE;
3078 if (grp)
3079 return -EACCES;
3080 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3081 if (!grp)
3082 return -ENOMEM;
3083 tsk->group = grp;
3084 msg_set_lookup_scope(hdr, mreq->scope);
3085 msg_set_nametype(hdr, mreq->type);
3086 msg_set_dest_droppable(hdr, true);
3087 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3088 mreq->type, mreq->instance, mreq->instance);
3089 tipc_nametbl_build_group(net, grp, &ua);
3090 rc = tipc_sk_publish(tsk, &ua);
3091 if (rc) {
3092 tipc_group_delete(net, grp);
3093 tsk->group = NULL;
3094 return rc;
3095 }
3096 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3097 tsk->mc_method.rcast = true;
3098 tsk->mc_method.mandatory = true;
3099 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3100 return rc;
3101}
3102
3103static int tipc_sk_leave(struct tipc_sock *tsk)
3104{
3105 struct net *net = sock_net(&tsk->sk);
3106 struct tipc_group *grp = tsk->group;
3107 struct tipc_uaddr ua;
3108 int scope;
3109
3110 if (!grp)
3111 return -EINVAL;
3112 ua.addrtype = TIPC_SERVICE_RANGE;
3113 tipc_group_self(grp, &ua.sr, &scope);
3114 ua.scope = scope;
3115 tipc_group_delete(net, grp);
3116 tsk->group = NULL;
3117 tipc_sk_withdraw(tsk, &ua);
3118 return 0;
3119}
3120
3121/**
3122 * tipc_setsockopt - set socket option
3123 * @sock: socket structure
3124 * @lvl: option level
3125 * @opt: option identifier
3126 * @ov: pointer to new option value
3127 * @ol: length of option value
3128 *
3129 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3130 * (to ease compatibility).
3131 *
3132 * Return: 0 on success, errno otherwise
3133 */
3134static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3135 sockptr_t ov, unsigned int ol)
3136{
3137 struct sock *sk = sock->sk;
3138 struct tipc_sock *tsk = tipc_sk(sk);
3139 struct tipc_group_req mreq;
3140 u32 value = 0;
3141 int res = 0;
3142
3143 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3144 return 0;
3145 if (lvl != SOL_TIPC)
3146 return -ENOPROTOOPT;
3147
3148 switch (opt) {
3149 case TIPC_IMPORTANCE:
3150 case TIPC_SRC_DROPPABLE:
3151 case TIPC_DEST_DROPPABLE:
3152 case TIPC_CONN_TIMEOUT:
3153 case TIPC_NODELAY:
3154 if (ol < sizeof(value))
3155 return -EINVAL;
3156 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3157 return -EFAULT;
3158 break;
3159 case TIPC_GROUP_JOIN:
3160 if (ol < sizeof(mreq))
3161 return -EINVAL;
3162 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3163 return -EFAULT;
3164 break;
3165 default:
3166 if (!sockptr_is_null(ov) || ol)
3167 return -EINVAL;
3168 }
3169
3170 lock_sock(sk);
3171
3172 switch (opt) {
3173 case TIPC_IMPORTANCE:
3174 res = tsk_set_importance(sk, value);
3175 break;
3176 case TIPC_SRC_DROPPABLE:
3177 if (sock->type != SOCK_STREAM)
3178 tsk_set_unreliable(tsk, value);
3179 else
3180 res = -ENOPROTOOPT;
3181 break;
3182 case TIPC_DEST_DROPPABLE:
3183 tsk_set_unreturnable(tsk, value);
3184 break;
3185 case TIPC_CONN_TIMEOUT:
3186 tipc_sk(sk)->conn_timeout = value;
3187 break;
3188 case TIPC_MCAST_BROADCAST:
3189 tsk->mc_method.rcast = false;
3190 tsk->mc_method.mandatory = true;
3191 break;
3192 case TIPC_MCAST_REPLICAST:
3193 tsk->mc_method.rcast = true;
3194 tsk->mc_method.mandatory = true;
3195 break;
3196 case TIPC_GROUP_JOIN:
3197 res = tipc_sk_join(tsk, &mreq);
3198 break;
3199 case TIPC_GROUP_LEAVE:
3200 res = tipc_sk_leave(tsk);
3201 break;
3202 case TIPC_NODELAY:
3203 tsk->nodelay = !!value;
3204 tsk_set_nagle(tsk);
3205 break;
3206 default:
3207 res = -EINVAL;
3208 }
3209
3210 release_sock(sk);
3211
3212 return res;
3213}
3214
3215/**
3216 * tipc_getsockopt - get socket option
3217 * @sock: socket structure
3218 * @lvl: option level
3219 * @opt: option identifier
3220 * @ov: receptacle for option value
3221 * @ol: receptacle for length of option value
3222 *
3223 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3224 * (to ease compatibility).
3225 *
3226 * Return: 0 on success, errno otherwise
3227 */
3228static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3229 char __user *ov, int __user *ol)
3230{
3231 struct sock *sk = sock->sk;
3232 struct tipc_sock *tsk = tipc_sk(sk);
3233 struct tipc_service_range seq;
3234 int len, scope;
3235 u32 value;
3236 int res;
3237
3238 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3239 return put_user(0, ol);
3240 if (lvl != SOL_TIPC)
3241 return -ENOPROTOOPT;
3242 res = get_user(len, ol);
3243 if (res)
3244 return res;
3245
3246 lock_sock(sk);
3247
3248 switch (opt) {
3249 case TIPC_IMPORTANCE:
3250 value = tsk_importance(tsk);
3251 break;
3252 case TIPC_SRC_DROPPABLE:
3253 value = tsk_unreliable(tsk);
3254 break;
3255 case TIPC_DEST_DROPPABLE:
3256 value = tsk_unreturnable(tsk);
3257 break;
3258 case TIPC_CONN_TIMEOUT:
3259 value = tsk->conn_timeout;
3260 /* no need to set "res", since already 0 at this point */
3261 break;
3262 case TIPC_NODE_RECVQ_DEPTH:
3263 value = 0; /* was tipc_queue_size, now obsolete */
3264 break;
3265 case TIPC_SOCK_RECVQ_DEPTH:
3266 value = skb_queue_len(&sk->sk_receive_queue);
3267 break;
3268 case TIPC_SOCK_RECVQ_USED:
3269 value = sk_rmem_alloc_get(sk);
3270 break;
3271 case TIPC_GROUP_JOIN:
3272 seq.type = 0;
3273 if (tsk->group)
3274 tipc_group_self(tsk->group, &seq, &scope);
3275 value = seq.type;
3276 break;
3277 default:
3278 res = -EINVAL;
3279 }
3280
3281 release_sock(sk);
3282
3283 if (res)
3284 return res; /* "get" failed */
3285
3286 if (len < sizeof(value))
3287 return -EINVAL;
3288
3289 if (copy_to_user(ov, &value, sizeof(value)))
3290 return -EFAULT;
3291
3292 return put_user(sizeof(value), ol);
3293}
3294
3295static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3296{
3297 struct net *net = sock_net(sock->sk);
3298 struct tipc_sioc_nodeid_req nr = {0};
3299 struct tipc_sioc_ln_req lnr;
3300 void __user *argp = (void __user *)arg;
3301
3302 switch (cmd) {
3303 case SIOCGETLINKNAME:
3304 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3305 return -EFAULT;
3306 if (!tipc_node_get_linkname(net,
3307 lnr.bearer_id & 0xffff, lnr.peer,
3308 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3309 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3310 return -EFAULT;
3311 return 0;
3312 }
3313 return -EADDRNOTAVAIL;
3314 case SIOCGETNODEID:
3315 if (copy_from_user(&nr, argp, sizeof(nr)))
3316 return -EFAULT;
3317 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3318 return -EADDRNOTAVAIL;
3319 if (copy_to_user(argp, &nr, sizeof(nr)))
3320 return -EFAULT;
3321 return 0;
3322 default:
3323 return -ENOIOCTLCMD;
3324 }
3325}
3326
3327static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3328{
3329 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3330 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3331 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3332
3333 tsk1->peer.family = AF_TIPC;
3334 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3335 tsk1->peer.scope = TIPC_NODE_SCOPE;
3336 tsk1->peer.addr.id.ref = tsk2->portid;
3337 tsk1->peer.addr.id.node = onode;
3338 tsk2->peer.family = AF_TIPC;
3339 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3340 tsk2->peer.scope = TIPC_NODE_SCOPE;
3341 tsk2->peer.addr.id.ref = tsk1->portid;
3342 tsk2->peer.addr.id.node = onode;
3343
3344 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3345 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3346 return 0;
3347}
3348
3349/* Protocol switches for the various types of TIPC sockets */
3350
3351static const struct proto_ops msg_ops = {
3352 .owner = THIS_MODULE,
3353 .family = AF_TIPC,
3354 .release = tipc_release,
3355 .bind = tipc_bind,
3356 .connect = tipc_connect,
3357 .socketpair = tipc_socketpair,
3358 .accept = sock_no_accept,
3359 .getname = tipc_getname,
3360 .poll = tipc_poll,
3361 .ioctl = tipc_ioctl,
3362 .listen = sock_no_listen,
3363 .shutdown = tipc_shutdown,
3364 .setsockopt = tipc_setsockopt,
3365 .getsockopt = tipc_getsockopt,
3366 .sendmsg = tipc_sendmsg,
3367 .recvmsg = tipc_recvmsg,
3368 .mmap = sock_no_mmap,
3369 .sendpage = sock_no_sendpage
3370};
3371
3372static const struct proto_ops packet_ops = {
3373 .owner = THIS_MODULE,
3374 .family = AF_TIPC,
3375 .release = tipc_release,
3376 .bind = tipc_bind,
3377 .connect = tipc_connect,
3378 .socketpair = tipc_socketpair,
3379 .accept = tipc_accept,
3380 .getname = tipc_getname,
3381 .poll = tipc_poll,
3382 .ioctl = tipc_ioctl,
3383 .listen = tipc_listen,
3384 .shutdown = tipc_shutdown,
3385 .setsockopt = tipc_setsockopt,
3386 .getsockopt = tipc_getsockopt,
3387 .sendmsg = tipc_send_packet,
3388 .recvmsg = tipc_recvmsg,
3389 .mmap = sock_no_mmap,
3390 .sendpage = sock_no_sendpage
3391};
3392
3393static const struct proto_ops stream_ops = {
3394 .owner = THIS_MODULE,
3395 .family = AF_TIPC,
3396 .release = tipc_release,
3397 .bind = tipc_bind,
3398 .connect = tipc_connect,
3399 .socketpair = tipc_socketpair,
3400 .accept = tipc_accept,
3401 .getname = tipc_getname,
3402 .poll = tipc_poll,
3403 .ioctl = tipc_ioctl,
3404 .listen = tipc_listen,
3405 .shutdown = tipc_shutdown,
3406 .setsockopt = tipc_setsockopt,
3407 .getsockopt = tipc_getsockopt,
3408 .sendmsg = tipc_sendstream,
3409 .recvmsg = tipc_recvstream,
3410 .mmap = sock_no_mmap,
3411 .sendpage = sock_no_sendpage
3412};
3413
3414static const struct net_proto_family tipc_family_ops = {
3415 .owner = THIS_MODULE,
3416 .family = AF_TIPC,
3417 .create = tipc_sk_create
3418};
3419
3420static struct proto tipc_proto = {
3421 .name = "TIPC",
3422 .owner = THIS_MODULE,
3423 .obj_size = sizeof(struct tipc_sock),
3424 .sysctl_rmem = sysctl_tipc_rmem
3425};
3426
3427/**
3428 * tipc_socket_init - initialize TIPC socket interface
3429 *
3430 * Return: 0 on success, errno otherwise
3431 */
3432int tipc_socket_init(void)
3433{
3434 int res;
3435
3436 res = proto_register(&tipc_proto, 1);
3437 if (res) {
3438 pr_err("Failed to register TIPC protocol type\n");
3439 goto out;
3440 }
3441
3442 res = sock_register(&tipc_family_ops);
3443 if (res) {
3444 pr_err("Failed to register TIPC socket type\n");
3445 proto_unregister(&tipc_proto);
3446 goto out;
3447 }
3448 out:
3449 return res;
3450}
3451
3452/**
3453 * tipc_socket_stop - stop TIPC socket interface
3454 */
3455void tipc_socket_stop(void)
3456{
3457 sock_unregister(tipc_family_ops.family);
3458 proto_unregister(&tipc_proto);
3459}
3460
3461/* Caller should hold socket lock for the passed tipc socket. */
3462static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3463{
3464 u32 peer_node, peer_port;
3465 u32 conn_type, conn_instance;
3466 struct nlattr *nest;
3467
3468 peer_node = tsk_peer_node(tsk);
3469 peer_port = tsk_peer_port(tsk);
3470 conn_type = msg_nametype(&tsk->phdr);
3471 conn_instance = msg_nameinst(&tsk->phdr);
3472 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3473 if (!nest)
3474 return -EMSGSIZE;
3475
3476 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3477 goto msg_full;
3478 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3479 goto msg_full;
3480
3481 if (tsk->conn_addrtype != 0) {
3482 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3483 goto msg_full;
3484 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3485 goto msg_full;
3486 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3487 goto msg_full;
3488 }
3489 nla_nest_end(skb, nest);
3490
3491 return 0;
3492
3493msg_full:
3494 nla_nest_cancel(skb, nest);
3495
3496 return -EMSGSIZE;
3497}
3498
3499static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3500 *tsk)
3501{
3502 struct net *net = sock_net(skb->sk);
3503 struct sock *sk = &tsk->sk;
3504
3505 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3506 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3507 return -EMSGSIZE;
3508
3509 if (tipc_sk_connected(sk)) {
3510 if (__tipc_nl_add_sk_con(skb, tsk))
3511 return -EMSGSIZE;
3512 } else if (!list_empty(&tsk->publications)) {
3513 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3514 return -EMSGSIZE;
3515 }
3516 return 0;
3517}
3518
3519/* Caller should hold socket lock for the passed tipc socket. */
3520static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3521 struct tipc_sock *tsk)
3522{
3523 struct nlattr *attrs;
3524 void *hdr;
3525
3526 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3527 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3528 if (!hdr)
3529 goto msg_cancel;
3530
3531 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3532 if (!attrs)
3533 goto genlmsg_cancel;
3534
3535 if (__tipc_nl_add_sk_info(skb, tsk))
3536 goto attr_msg_cancel;
3537
3538 nla_nest_end(skb, attrs);
3539 genlmsg_end(skb, hdr);
3540
3541 return 0;
3542
3543attr_msg_cancel:
3544 nla_nest_cancel(skb, attrs);
3545genlmsg_cancel:
3546 genlmsg_cancel(skb, hdr);
3547msg_cancel:
3548 return -EMSGSIZE;
3549}
3550
3551int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3552 int (*skb_handler)(struct sk_buff *skb,
3553 struct netlink_callback *cb,
3554 struct tipc_sock *tsk))
3555{
3556 struct rhashtable_iter *iter = (void *)cb->args[4];
3557 struct tipc_sock *tsk;
3558 int err;
3559
3560 rhashtable_walk_start(iter);
3561 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3562 if (IS_ERR(tsk)) {
3563 err = PTR_ERR(tsk);
3564 if (err == -EAGAIN) {
3565 err = 0;
3566 continue;
3567 }
3568 break;
3569 }
3570
3571 sock_hold(&tsk->sk);
3572 rhashtable_walk_stop(iter);
3573 lock_sock(&tsk->sk);
3574 err = skb_handler(skb, cb, tsk);
3575 if (err) {
3576 release_sock(&tsk->sk);
3577 sock_put(&tsk->sk);
3578 goto out;
3579 }
3580 release_sock(&tsk->sk);
3581 rhashtable_walk_start(iter);
3582 sock_put(&tsk->sk);
3583 }
3584 rhashtable_walk_stop(iter);
3585out:
3586 return skb->len;
3587}
3588EXPORT_SYMBOL(tipc_nl_sk_walk);
3589
3590int tipc_dump_start(struct netlink_callback *cb)
3591{
3592 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3593}
3594EXPORT_SYMBOL(tipc_dump_start);
3595
3596int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3597{
3598 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3599 struct rhashtable_iter *iter = (void *)cb->args[4];
3600 struct tipc_net *tn = tipc_net(net);
3601
3602 if (!iter) {
3603 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3604 if (!iter)
3605 return -ENOMEM;
3606
3607 cb->args[4] = (long)iter;
3608 }
3609
3610 rhashtable_walk_enter(&tn->sk_rht, iter);
3611 return 0;
3612}
3613
3614int tipc_dump_done(struct netlink_callback *cb)
3615{
3616 struct rhashtable_iter *hti = (void *)cb->args[4];
3617
3618 rhashtable_walk_exit(hti);
3619 kfree(hti);
3620 return 0;
3621}
3622EXPORT_SYMBOL(tipc_dump_done);
3623
3624int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3625 struct tipc_sock *tsk, u32 sk_filter_state,
3626 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3627{
3628 struct sock *sk = &tsk->sk;
3629 struct nlattr *attrs;
3630 struct nlattr *stat;
3631
3632 /*filter response w.r.t sk_state*/
3633 if (!(sk_filter_state & (1 << sk->sk_state)))
3634 return 0;
3635
3636 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3637 if (!attrs)
3638 goto msg_cancel;
3639
3640 if (__tipc_nl_add_sk_info(skb, tsk))
3641 goto attr_msg_cancel;
3642
3643 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3644 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3645 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3646 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3647 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3648 sock_i_uid(sk))) ||
3649 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3650 tipc_diag_gen_cookie(sk),
3651 TIPC_NLA_SOCK_PAD))
3652 goto attr_msg_cancel;
3653
3654 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3655 if (!stat)
3656 goto attr_msg_cancel;
3657
3658 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3659 skb_queue_len(&sk->sk_receive_queue)) ||
3660 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3661 skb_queue_len(&sk->sk_write_queue)) ||
3662 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3663 atomic_read(&sk->sk_drops)))
3664 goto stat_msg_cancel;
3665
3666 if (tsk->cong_link_cnt &&
3667 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3668 goto stat_msg_cancel;
3669
3670 if (tsk_conn_cong(tsk) &&
3671 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3672 goto stat_msg_cancel;
3673
3674 nla_nest_end(skb, stat);
3675
3676 if (tsk->group)
3677 if (tipc_group_fill_sock_diag(tsk->group, skb))
3678 goto stat_msg_cancel;
3679
3680 nla_nest_end(skb, attrs);
3681
3682 return 0;
3683
3684stat_msg_cancel:
3685 nla_nest_cancel(skb, stat);
3686attr_msg_cancel:
3687 nla_nest_cancel(skb, attrs);
3688msg_cancel:
3689 return -EMSGSIZE;
3690}
3691EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3692
3693int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3694{
3695 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3696}
3697
3698/* Caller should hold socket lock for the passed tipc socket. */
3699static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3700 struct netlink_callback *cb,
3701 struct publication *publ)
3702{
3703 void *hdr;
3704 struct nlattr *attrs;
3705
3706 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3707 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3708 if (!hdr)
3709 goto msg_cancel;
3710
3711 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3712 if (!attrs)
3713 goto genlmsg_cancel;
3714
3715 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3716 goto attr_msg_cancel;
3717 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3718 goto attr_msg_cancel;
3719 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3720 goto attr_msg_cancel;
3721 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3722 goto attr_msg_cancel;
3723
3724 nla_nest_end(skb, attrs);
3725 genlmsg_end(skb, hdr);
3726
3727 return 0;
3728
3729attr_msg_cancel:
3730 nla_nest_cancel(skb, attrs);
3731genlmsg_cancel:
3732 genlmsg_cancel(skb, hdr);
3733msg_cancel:
3734 return -EMSGSIZE;
3735}
3736
3737/* Caller should hold socket lock for the passed tipc socket. */
3738static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3739 struct netlink_callback *cb,
3740 struct tipc_sock *tsk, u32 *last_publ)
3741{
3742 int err;
3743 struct publication *p;
3744
3745 if (*last_publ) {
3746 list_for_each_entry(p, &tsk->publications, binding_sock) {
3747 if (p->key == *last_publ)
3748 break;
3749 }
3750 if (p->key != *last_publ) {
3751 /* We never set seq or call nl_dump_check_consistent()
3752 * this means that setting prev_seq here will cause the
3753 * consistence check to fail in the netlink callback
3754 * handler. Resulting in the last NLMSG_DONE message
3755 * having the NLM_F_DUMP_INTR flag set.
3756 */
3757 cb->prev_seq = 1;
3758 *last_publ = 0;
3759 return -EPIPE;
3760 }
3761 } else {
3762 p = list_first_entry(&tsk->publications, struct publication,
3763 binding_sock);
3764 }
3765
3766 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3767 err = __tipc_nl_add_sk_publ(skb, cb, p);
3768 if (err) {
3769 *last_publ = p->key;
3770 return err;
3771 }
3772 }
3773 *last_publ = 0;
3774
3775 return 0;
3776}
3777
3778int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3779{
3780 int err;
3781 u32 tsk_portid = cb->args[0];
3782 u32 last_publ = cb->args[1];
3783 u32 done = cb->args[2];
3784 struct net *net = sock_net(skb->sk);
3785 struct tipc_sock *tsk;
3786
3787 if (!tsk_portid) {
3788 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
3789 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3790
3791 if (!attrs[TIPC_NLA_SOCK])
3792 return -EINVAL;
3793
3794 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3795 attrs[TIPC_NLA_SOCK],
3796 tipc_nl_sock_policy, NULL);
3797 if (err)
3798 return err;
3799
3800 if (!sock[TIPC_NLA_SOCK_REF])
3801 return -EINVAL;
3802
3803 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3804 }
3805
3806 if (done)
3807 return 0;
3808
3809 tsk = tipc_sk_lookup(net, tsk_portid);
3810 if (!tsk)
3811 return -EINVAL;
3812
3813 lock_sock(&tsk->sk);
3814 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3815 if (!err)
3816 done = 1;
3817 release_sock(&tsk->sk);
3818 sock_put(&tsk->sk);
3819
3820 cb->args[0] = tsk_portid;
3821 cb->args[1] = last_publ;
3822 cb->args[2] = done;
3823
3824 return skb->len;
3825}
3826
3827/**
3828 * tipc_sk_filtering - check if a socket should be traced
3829 * @sk: the socket to be examined
3830 *
3831 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3832 * (portid, sock type, name type, name lower, name upper)
3833 *
3834 * Return: true if the socket meets the socket tuple data
3835 * (value 0 = 'any') or when there is no tuple set (all = 0),
3836 * otherwise false
3837 */
3838bool tipc_sk_filtering(struct sock *sk)
3839{
3840 struct tipc_sock *tsk;
3841 struct publication *p;
3842 u32 _port, _sktype, _type, _lower, _upper;
3843 u32 type = 0, lower = 0, upper = 0;
3844
3845 if (!sk)
3846 return true;
3847
3848 tsk = tipc_sk(sk);
3849
3850 _port = sysctl_tipc_sk_filter[0];
3851 _sktype = sysctl_tipc_sk_filter[1];
3852 _type = sysctl_tipc_sk_filter[2];
3853 _lower = sysctl_tipc_sk_filter[3];
3854 _upper = sysctl_tipc_sk_filter[4];
3855
3856 if (!_port && !_sktype && !_type && !_lower && !_upper)
3857 return true;
3858
3859 if (_port)
3860 return (_port == tsk->portid);
3861
3862 if (_sktype && _sktype != sk->sk_type)
3863 return false;
3864
3865 if (tsk->published) {
3866 p = list_first_entry_or_null(&tsk->publications,
3867 struct publication, binding_sock);
3868 if (p) {
3869 type = p->sr.type;
3870 lower = p->sr.lower;
3871 upper = p->sr.upper;
3872 }
3873 }
3874
3875 if (!tipc_sk_type_connectionless(sk)) {
3876 type = msg_nametype(&tsk->phdr);
3877 lower = msg_nameinst(&tsk->phdr);
3878 upper = lower;
3879 }
3880
3881 if ((_type && _type != type) || (_lower && _lower != lower) ||
3882 (_upper && _upper != upper))
3883 return false;
3884
3885 return true;
3886}
3887
3888u32 tipc_sock_get_portid(struct sock *sk)
3889{
3890 return (sk) ? (tipc_sk(sk))->portid : 0;
3891}
3892
3893/**
3894 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3895 * both the rcv and backlog queues are considered
3896 * @sk: tipc sk to be checked
3897 * @skb: tipc msg to be checked
3898 *
3899 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3900 */
3901
3902bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3903{
3904 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3905 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3906 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3907
3908 return (qsize > lim * 90 / 100);
3909}
3910
3911/**
3912 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3913 * only the rcv queue is considered
3914 * @sk: tipc sk to be checked
3915 * @skb: tipc msg to be checked
3916 *
3917 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3918 */
3919
3920bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3921{
3922 unsigned int lim = rcvbuf_limit(sk, skb);
3923 unsigned int qsize = sk_rmem_alloc_get(sk);
3924
3925 return (qsize > lim * 90 / 100);
3926}
3927
3928/**
3929 * tipc_sk_dump - dump TIPC socket
3930 * @sk: tipc sk to be dumped
3931 * @dqueues: bitmask to decide if any socket queue to be dumped?
3932 * - TIPC_DUMP_NONE: don't dump socket queues
3933 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3934 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3935 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3936 * - TIPC_DUMP_ALL: dump all the socket queues above
3937 * @buf: returned buffer of dump data in format
3938 */
3939int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3940{
3941 int i = 0;
3942 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3943 u32 conn_type, conn_instance;
3944 struct tipc_sock *tsk;
3945 struct publication *p;
3946 bool tsk_connected;
3947
3948 if (!sk) {
3949 i += scnprintf(buf, sz, "sk data: (null)\n");
3950 return i;
3951 }
3952
3953 tsk = tipc_sk(sk);
3954 tsk_connected = !tipc_sk_type_connectionless(sk);
3955
3956 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3957 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3958 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3959 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3960 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3961 if (tsk_connected) {
3962 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3963 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3964 conn_type = msg_nametype(&tsk->phdr);
3965 conn_instance = msg_nameinst(&tsk->phdr);
3966 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3967 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3968 }
3969 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3970 if (tsk->published) {
3971 p = list_first_entry_or_null(&tsk->publications,
3972 struct publication, binding_sock);
3973 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3974 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3975 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3976 }
3977 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3978 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3979 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3980 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3981 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3982 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3983 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3984 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3985 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3986 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3987 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3988 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3989 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3990 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3991
3992 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3993 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3994 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3995 }
3996
3997 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3998 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3999 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
4000 }
4001
4002 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
4003 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
4004 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
4005 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
4006 i += scnprintf(buf + i, sz - i, " tail ");
4007 i += tipc_skb_dump(sk->sk_backlog.tail, false,
4008 buf + i);
4009 }
4010 }
4011
4012 return i;
4013}