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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#include <trace/events/sock.h>
41
42#include "core.h"
43#include "name_table.h"
44#include "node.h"
45#include "link.h"
46#include "name_distr.h"
47#include "socket.h"
48#include "bcast.h"
49#include "netlink.h"
50#include "group.h"
51#include "trace.h"
52
53#define NAGLE_START_INIT 4
54#define NAGLE_START_MAX 1024
55#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
56#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
57#define TIPC_MAX_PORT 0xffffffff
58#define TIPC_MIN_PORT 1
59#define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */
60
61enum {
62 TIPC_LISTEN = TCP_LISTEN,
63 TIPC_ESTABLISHED = TCP_ESTABLISHED,
64 TIPC_OPEN = TCP_CLOSE,
65 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
66 TIPC_CONNECTING = TCP_SYN_SENT,
67};
68
69struct sockaddr_pair {
70 struct sockaddr_tipc sock;
71 struct sockaddr_tipc member;
72};
73
74/**
75 * struct tipc_sock - TIPC socket structure
76 * @sk: socket - interacts with 'port' and with user via the socket API
77 * @max_pkt: maximum packet size "hint" used when building messages sent by port
78 * @maxnagle: maximum size of msg which can be subject to nagle
79 * @portid: unique port identity in TIPC socket hash table
80 * @phdr: preformatted message header used when sending messages
81 * @cong_links: list of congested links
82 * @publications: list of publications for port
83 * @blocking_link: address of the congested link we are currently sleeping on
84 * @pub_count: total # of publications port has made during its lifetime
85 * @conn_timeout: the time we can wait for an unresponded setup request
86 * @probe_unacked: probe has not received ack yet
87 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
88 * @cong_link_cnt: number of congested links
89 * @snt_unacked: # messages sent by socket, and not yet acked by peer
90 * @snd_win: send window size
91 * @peer_caps: peer capabilities mask
92 * @rcv_unacked: # messages read by user, but not yet acked back to peer
93 * @rcv_win: receive window size
94 * @peer: 'connected' peer for dgram/rdm
95 * @node: hash table node
96 * @mc_method: cookie for use between socket and broadcast layer
97 * @rcu: rcu struct for tipc_sock
98 * @group: TIPC communications group
99 * @oneway: message count in one direction (FIXME)
100 * @nagle_start: current nagle value
101 * @snd_backlog: send backlog count
102 * @msg_acc: messages accepted; used in managing backlog and nagle
103 * @pkt_cnt: TIPC socket packet count
104 * @expect_ack: whether this TIPC socket is expecting an ack
105 * @nodelay: setsockopt() TIPC_NODELAY setting
106 * @group_is_open: TIPC socket group is fully open (FIXME)
107 * @published: true if port has one or more associated names
108 * @conn_addrtype: address type used when establishing connection
109 */
110struct tipc_sock {
111 struct sock sk;
112 u32 max_pkt;
113 u32 maxnagle;
114 u32 portid;
115 struct tipc_msg phdr;
116 struct list_head cong_links;
117 struct list_head publications;
118 u32 pub_count;
119 atomic_t dupl_rcvcnt;
120 u16 conn_timeout;
121 bool probe_unacked;
122 u16 cong_link_cnt;
123 u16 snt_unacked;
124 u16 snd_win;
125 u16 peer_caps;
126 u16 rcv_unacked;
127 u16 rcv_win;
128 struct sockaddr_tipc peer;
129 struct rhash_head node;
130 struct tipc_mc_method mc_method;
131 struct rcu_head rcu;
132 struct tipc_group *group;
133 u32 oneway;
134 u32 nagle_start;
135 u16 snd_backlog;
136 u16 msg_acc;
137 u16 pkt_cnt;
138 bool expect_ack;
139 bool nodelay;
140 bool group_is_open;
141 bool published;
142 u8 conn_addrtype;
143};
144
145static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
146static void tipc_data_ready(struct sock *sk);
147static void tipc_write_space(struct sock *sk);
148static void tipc_sock_destruct(struct sock *sk);
149static int tipc_release(struct socket *sock);
150static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
151 bool kern);
152static void tipc_sk_timeout(struct timer_list *t);
153static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
154static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
155static int tipc_sk_leave(struct tipc_sock *tsk);
156static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
157static int tipc_sk_insert(struct tipc_sock *tsk);
158static void tipc_sk_remove(struct tipc_sock *tsk);
159static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
160static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
161static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
162static int tipc_wait_for_connect(struct socket *sock, long *timeo_p);
163
164static const struct proto_ops packet_ops;
165static const struct proto_ops stream_ops;
166static const struct proto_ops msg_ops;
167static struct proto tipc_proto;
168static const struct rhashtable_params tsk_rht_params;
169
170static u32 tsk_own_node(struct tipc_sock *tsk)
171{
172 return msg_prevnode(&tsk->phdr);
173}
174
175static u32 tsk_peer_node(struct tipc_sock *tsk)
176{
177 return msg_destnode(&tsk->phdr);
178}
179
180static u32 tsk_peer_port(struct tipc_sock *tsk)
181{
182 return msg_destport(&tsk->phdr);
183}
184
185static bool tsk_unreliable(struct tipc_sock *tsk)
186{
187 return msg_src_droppable(&tsk->phdr) != 0;
188}
189
190static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
191{
192 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
193}
194
195static bool tsk_unreturnable(struct tipc_sock *tsk)
196{
197 return msg_dest_droppable(&tsk->phdr) != 0;
198}
199
200static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
201{
202 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
203}
204
205static int tsk_importance(struct tipc_sock *tsk)
206{
207 return msg_importance(&tsk->phdr);
208}
209
210static struct tipc_sock *tipc_sk(const struct sock *sk)
211{
212 return container_of(sk, struct tipc_sock, sk);
213}
214
215int tsk_set_importance(struct sock *sk, int imp)
216{
217 if (imp > TIPC_CRITICAL_IMPORTANCE)
218 return -EINVAL;
219 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
220 return 0;
221}
222
223static bool tsk_conn_cong(struct tipc_sock *tsk)
224{
225 return tsk->snt_unacked > tsk->snd_win;
226}
227
228static u16 tsk_blocks(int len)
229{
230 return ((len / FLOWCTL_BLK_SZ) + 1);
231}
232
233/* tsk_blocks(): translate a buffer size in bytes to number of
234 * advertisable blocks, taking into account the ratio truesize(len)/len
235 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
236 */
237static u16 tsk_adv_blocks(int len)
238{
239 return len / FLOWCTL_BLK_SZ / 4;
240}
241
242/* tsk_inc(): increment counter for sent or received data
243 * - If block based flow control is not supported by peer we
244 * fall back to message based ditto, incrementing the counter
245 */
246static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
247{
248 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
249 return ((msglen / FLOWCTL_BLK_SZ) + 1);
250 return 1;
251}
252
253/* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
254 */
255static void tsk_set_nagle(struct tipc_sock *tsk)
256{
257 struct sock *sk = &tsk->sk;
258
259 tsk->maxnagle = 0;
260 if (sk->sk_type != SOCK_STREAM)
261 return;
262 if (tsk->nodelay)
263 return;
264 if (!(tsk->peer_caps & TIPC_NAGLE))
265 return;
266 /* Limit node local buffer size to avoid receive queue overflow */
267 if (tsk->max_pkt == MAX_MSG_SIZE)
268 tsk->maxnagle = 1500;
269 else
270 tsk->maxnagle = tsk->max_pkt;
271}
272
273/**
274 * tsk_advance_rx_queue - discard first buffer in socket receive queue
275 * @sk: network socket
276 *
277 * Caller must hold socket lock
278 */
279static void tsk_advance_rx_queue(struct sock *sk)
280{
281 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
282 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
283}
284
285/* tipc_sk_respond() : send response message back to sender
286 */
287static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
288{
289 u32 selector;
290 u32 dnode;
291 u32 onode = tipc_own_addr(sock_net(sk));
292
293 if (!tipc_msg_reverse(onode, &skb, err))
294 return;
295
296 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
297 dnode = msg_destnode(buf_msg(skb));
298 selector = msg_origport(buf_msg(skb));
299 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
300}
301
302/**
303 * tsk_rej_rx_queue - reject all buffers in socket receive queue
304 * @sk: network socket
305 * @error: response error code
306 *
307 * Caller must hold socket lock
308 */
309static void tsk_rej_rx_queue(struct sock *sk, int error)
310{
311 struct sk_buff *skb;
312
313 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
314 tipc_sk_respond(sk, skb, error);
315}
316
317static bool tipc_sk_connected(const struct sock *sk)
318{
319 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED;
320}
321
322/* tipc_sk_type_connectionless - check if the socket is datagram socket
323 * @sk: socket
324 *
325 * Returns true if connection less, false otherwise
326 */
327static bool tipc_sk_type_connectionless(struct sock *sk)
328{
329 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
330}
331
332/* tsk_peer_msg - verify if message was sent by connected port's peer
333 *
334 * Handles cases where the node's network address has changed from
335 * the default of <0.0.0> to its configured setting.
336 */
337static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
338{
339 struct sock *sk = &tsk->sk;
340 u32 self = tipc_own_addr(sock_net(sk));
341 u32 peer_port = tsk_peer_port(tsk);
342 u32 orig_node, peer_node;
343
344 if (unlikely(!tipc_sk_connected(sk)))
345 return false;
346
347 if (unlikely(msg_origport(msg) != peer_port))
348 return false;
349
350 orig_node = msg_orignode(msg);
351 peer_node = tsk_peer_node(tsk);
352
353 if (likely(orig_node == peer_node))
354 return true;
355
356 if (!orig_node && peer_node == self)
357 return true;
358
359 if (!peer_node && orig_node == self)
360 return true;
361
362 return false;
363}
364
365/* tipc_set_sk_state - set the sk_state of the socket
366 * @sk: socket
367 *
368 * Caller must hold socket lock
369 *
370 * Returns 0 on success, errno otherwise
371 */
372static int tipc_set_sk_state(struct sock *sk, int state)
373{
374 int oldsk_state = sk->sk_state;
375 int res = -EINVAL;
376
377 switch (state) {
378 case TIPC_OPEN:
379 res = 0;
380 break;
381 case TIPC_LISTEN:
382 case TIPC_CONNECTING:
383 if (oldsk_state == TIPC_OPEN)
384 res = 0;
385 break;
386 case TIPC_ESTABLISHED:
387 if (oldsk_state == TIPC_CONNECTING ||
388 oldsk_state == TIPC_OPEN)
389 res = 0;
390 break;
391 case TIPC_DISCONNECTING:
392 if (oldsk_state == TIPC_CONNECTING ||
393 oldsk_state == TIPC_ESTABLISHED)
394 res = 0;
395 break;
396 }
397
398 if (!res)
399 sk->sk_state = state;
400
401 return res;
402}
403
404static int tipc_sk_sock_err(struct socket *sock, long *timeout)
405{
406 struct sock *sk = sock->sk;
407 int err = sock_error(sk);
408 int typ = sock->type;
409
410 if (err)
411 return err;
412 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
413 if (sk->sk_state == TIPC_DISCONNECTING)
414 return -EPIPE;
415 else if (!tipc_sk_connected(sk))
416 return -ENOTCONN;
417 }
418 if (!*timeout)
419 return -EAGAIN;
420 if (signal_pending(current))
421 return sock_intr_errno(*timeout);
422
423 return 0;
424}
425
426#define tipc_wait_for_cond(sock_, timeo_, condition_) \
427({ \
428 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
429 struct sock *sk_; \
430 int rc_; \
431 \
432 while ((rc_ = !(condition_))) { \
433 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
434 smp_rmb(); \
435 sk_ = (sock_)->sk; \
436 rc_ = tipc_sk_sock_err((sock_), timeo_); \
437 if (rc_) \
438 break; \
439 add_wait_queue(sk_sleep(sk_), &wait_); \
440 release_sock(sk_); \
441 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
442 sched_annotate_sleep(); \
443 lock_sock(sk_); \
444 remove_wait_queue(sk_sleep(sk_), &wait_); \
445 } \
446 rc_; \
447})
448
449/**
450 * tipc_sk_create - create a TIPC socket
451 * @net: network namespace (must be default network)
452 * @sock: pre-allocated socket structure
453 * @protocol: protocol indicator (must be 0)
454 * @kern: caused by kernel or by userspace?
455 *
456 * This routine creates additional data structures used by the TIPC socket,
457 * initializes them, and links them together.
458 *
459 * Return: 0 on success, errno otherwise
460 */
461static int tipc_sk_create(struct net *net, struct socket *sock,
462 int protocol, int kern)
463{
464 const struct proto_ops *ops;
465 struct sock *sk;
466 struct tipc_sock *tsk;
467 struct tipc_msg *msg;
468
469 /* Validate arguments */
470 if (unlikely(protocol != 0))
471 return -EPROTONOSUPPORT;
472
473 switch (sock->type) {
474 case SOCK_STREAM:
475 ops = &stream_ops;
476 break;
477 case SOCK_SEQPACKET:
478 ops = &packet_ops;
479 break;
480 case SOCK_DGRAM:
481 case SOCK_RDM:
482 ops = &msg_ops;
483 break;
484 default:
485 return -EPROTOTYPE;
486 }
487
488 /* Allocate socket's protocol area */
489 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
490 if (sk == NULL)
491 return -ENOMEM;
492
493 tsk = tipc_sk(sk);
494 tsk->max_pkt = MAX_PKT_DEFAULT;
495 tsk->maxnagle = 0;
496 tsk->nagle_start = NAGLE_START_INIT;
497 INIT_LIST_HEAD(&tsk->publications);
498 INIT_LIST_HEAD(&tsk->cong_links);
499 msg = &tsk->phdr;
500
501 /* Finish initializing socket data structures */
502 sock->ops = ops;
503 sock_init_data(sock, sk);
504 tipc_set_sk_state(sk, TIPC_OPEN);
505 if (tipc_sk_insert(tsk)) {
506 sk_free(sk);
507 pr_warn("Socket create failed; port number exhausted\n");
508 return -EINVAL;
509 }
510
511 /* Ensure tsk is visible before we read own_addr. */
512 smp_mb();
513
514 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
515 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
516
517 msg_set_origport(msg, tsk->portid);
518 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
519 sk->sk_shutdown = 0;
520 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
521 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]);
522 sk->sk_data_ready = tipc_data_ready;
523 sk->sk_write_space = tipc_write_space;
524 sk->sk_destruct = tipc_sock_destruct;
525 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
526 tsk->group_is_open = true;
527 atomic_set(&tsk->dupl_rcvcnt, 0);
528
529 /* Start out with safe limits until we receive an advertised window */
530 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
531 tsk->rcv_win = tsk->snd_win;
532
533 if (tipc_sk_type_connectionless(sk)) {
534 tsk_set_unreturnable(tsk, true);
535 if (sock->type == SOCK_DGRAM)
536 tsk_set_unreliable(tsk, true);
537 }
538 __skb_queue_head_init(&tsk->mc_method.deferredq);
539 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
540 return 0;
541}
542
543static void tipc_sk_callback(struct rcu_head *head)
544{
545 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
546
547 sock_put(&tsk->sk);
548}
549
550/* Caller should hold socket lock for the socket. */
551static void __tipc_shutdown(struct socket *sock, int error)
552{
553 struct sock *sk = sock->sk;
554 struct tipc_sock *tsk = tipc_sk(sk);
555 struct net *net = sock_net(sk);
556 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
557 u32 dnode = tsk_peer_node(tsk);
558 struct sk_buff *skb;
559
560 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
561 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
562 !tsk_conn_cong(tsk)));
563
564 /* Push out delayed messages if in Nagle mode */
565 tipc_sk_push_backlog(tsk, false);
566 /* Remove pending SYN */
567 __skb_queue_purge(&sk->sk_write_queue);
568
569 /* Remove partially received buffer if any */
570 skb = skb_peek(&sk->sk_receive_queue);
571 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
572 __skb_unlink(skb, &sk->sk_receive_queue);
573 kfree_skb(skb);
574 }
575
576 /* Reject all unreceived messages if connectionless */
577 if (tipc_sk_type_connectionless(sk)) {
578 tsk_rej_rx_queue(sk, error);
579 return;
580 }
581
582 switch (sk->sk_state) {
583 case TIPC_CONNECTING:
584 case TIPC_ESTABLISHED:
585 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
586 tipc_node_remove_conn(net, dnode, tsk->portid);
587 /* Send a FIN+/- to its peer */
588 skb = __skb_dequeue(&sk->sk_receive_queue);
589 if (skb) {
590 __skb_queue_purge(&sk->sk_receive_queue);
591 tipc_sk_respond(sk, skb, error);
592 break;
593 }
594 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
595 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
596 tsk_own_node(tsk), tsk_peer_port(tsk),
597 tsk->portid, error);
598 if (skb)
599 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
600 break;
601 case TIPC_LISTEN:
602 /* Reject all SYN messages */
603 tsk_rej_rx_queue(sk, error);
604 break;
605 default:
606 __skb_queue_purge(&sk->sk_receive_queue);
607 break;
608 }
609}
610
611/**
612 * tipc_release - destroy a TIPC socket
613 * @sock: socket to destroy
614 *
615 * This routine cleans up any messages that are still queued on the socket.
616 * For DGRAM and RDM socket types, all queued messages are rejected.
617 * For SEQPACKET and STREAM socket types, the first message is rejected
618 * and any others are discarded. (If the first message on a STREAM socket
619 * is partially-read, it is discarded and the next one is rejected instead.)
620 *
621 * NOTE: Rejected messages are not necessarily returned to the sender! They
622 * are returned or discarded according to the "destination droppable" setting
623 * specified for the message by the sender.
624 *
625 * Return: 0 on success, errno otherwise
626 */
627static int tipc_release(struct socket *sock)
628{
629 struct sock *sk = sock->sk;
630 struct tipc_sock *tsk;
631
632 /*
633 * Exit if socket isn't fully initialized (occurs when a failed accept()
634 * releases a pre-allocated child socket that was never used)
635 */
636 if (sk == NULL)
637 return 0;
638
639 tsk = tipc_sk(sk);
640 lock_sock(sk);
641
642 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
643 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
644 sk->sk_shutdown = SHUTDOWN_MASK;
645 tipc_sk_leave(tsk);
646 tipc_sk_withdraw(tsk, NULL);
647 __skb_queue_purge(&tsk->mc_method.deferredq);
648 sk_stop_timer(sk, &sk->sk_timer);
649 tipc_sk_remove(tsk);
650
651 sock_orphan(sk);
652 /* Reject any messages that accumulated in backlog queue */
653 release_sock(sk);
654 tipc_dest_list_purge(&tsk->cong_links);
655 tsk->cong_link_cnt = 0;
656 call_rcu(&tsk->rcu, tipc_sk_callback);
657 sock->sk = NULL;
658
659 return 0;
660}
661
662/**
663 * __tipc_bind - associate or disassocate TIPC name(s) with a socket
664 * @sock: socket structure
665 * @skaddr: socket address describing name(s) and desired operation
666 * @alen: size of socket address data structure
667 *
668 * Name and name sequence binding are indicated using a positive scope value;
669 * a negative scope value unbinds the specified name. Specifying no name
670 * (i.e. a socket address length of 0) unbinds all names from the socket.
671 *
672 * Return: 0 on success, errno otherwise
673 *
674 * NOTE: This routine doesn't need to take the socket lock since it doesn't
675 * access any non-constant socket information.
676 */
677static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
678{
679 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
680 struct tipc_sock *tsk = tipc_sk(sock->sk);
681 bool unbind = false;
682
683 if (unlikely(!alen))
684 return tipc_sk_withdraw(tsk, NULL);
685
686 if (ua->addrtype == TIPC_SERVICE_ADDR) {
687 ua->addrtype = TIPC_SERVICE_RANGE;
688 ua->sr.upper = ua->sr.lower;
689 }
690 if (ua->scope < 0) {
691 unbind = true;
692 ua->scope = -ua->scope;
693 }
694 /* Users may still use deprecated TIPC_ZONE_SCOPE */
695 if (ua->scope != TIPC_NODE_SCOPE)
696 ua->scope = TIPC_CLUSTER_SCOPE;
697
698 if (tsk->group)
699 return -EACCES;
700
701 if (unbind)
702 return tipc_sk_withdraw(tsk, ua);
703 return tipc_sk_publish(tsk, ua);
704}
705
706int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
707{
708 int res;
709
710 lock_sock(sock->sk);
711 res = __tipc_bind(sock, skaddr, alen);
712 release_sock(sock->sk);
713 return res;
714}
715
716static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
717{
718 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
719 u32 atype = ua->addrtype;
720
721 if (alen) {
722 if (!tipc_uaddr_valid(ua, alen))
723 return -EINVAL;
724 if (atype == TIPC_SOCKET_ADDR)
725 return -EAFNOSUPPORT;
726 if (ua->sr.type < TIPC_RESERVED_TYPES) {
727 pr_warn_once("Can't bind to reserved service type %u\n",
728 ua->sr.type);
729 return -EACCES;
730 }
731 }
732 return tipc_sk_bind(sock, skaddr, alen);
733}
734
735/**
736 * tipc_getname - get port ID of socket or peer socket
737 * @sock: socket structure
738 * @uaddr: area for returned socket address
739 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
740 *
741 * Return: 0 on success, errno otherwise
742 *
743 * NOTE: This routine doesn't need to take the socket lock since it only
744 * accesses socket information that is unchanging (or which changes in
745 * a completely predictable manner).
746 */
747static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
748 int peer)
749{
750 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
751 struct sock *sk = sock->sk;
752 struct tipc_sock *tsk = tipc_sk(sk);
753
754 memset(addr, 0, sizeof(*addr));
755 if (peer) {
756 if ((!tipc_sk_connected(sk)) &&
757 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
758 return -ENOTCONN;
759 addr->addr.id.ref = tsk_peer_port(tsk);
760 addr->addr.id.node = tsk_peer_node(tsk);
761 } else {
762 addr->addr.id.ref = tsk->portid;
763 addr->addr.id.node = tipc_own_addr(sock_net(sk));
764 }
765
766 addr->addrtype = TIPC_SOCKET_ADDR;
767 addr->family = AF_TIPC;
768 addr->scope = 0;
769 addr->addr.name.domain = 0;
770
771 return sizeof(*addr);
772}
773
774/**
775 * tipc_poll - read and possibly block on pollmask
776 * @file: file structure associated with the socket
777 * @sock: socket for which to calculate the poll bits
778 * @wait: ???
779 *
780 * Return: pollmask value
781 *
782 * COMMENTARY:
783 * It appears that the usual socket locking mechanisms are not useful here
784 * since the pollmask info is potentially out-of-date the moment this routine
785 * exits. TCP and other protocols seem to rely on higher level poll routines
786 * to handle any preventable race conditions, so TIPC will do the same ...
787 *
788 * IMPORTANT: The fact that a read or write operation is indicated does NOT
789 * imply that the operation will succeed, merely that it should be performed
790 * and will not block.
791 */
792static __poll_t tipc_poll(struct file *file, struct socket *sock,
793 poll_table *wait)
794{
795 struct sock *sk = sock->sk;
796 struct tipc_sock *tsk = tipc_sk(sk);
797 __poll_t revents = 0;
798
799 sock_poll_wait(file, sock, wait);
800 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
801
802 if (sk->sk_shutdown & RCV_SHUTDOWN)
803 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
804 if (sk->sk_shutdown == SHUTDOWN_MASK)
805 revents |= EPOLLHUP;
806
807 switch (sk->sk_state) {
808 case TIPC_ESTABLISHED:
809 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
810 revents |= EPOLLOUT;
811 fallthrough;
812 case TIPC_LISTEN:
813 case TIPC_CONNECTING:
814 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
815 revents |= EPOLLIN | EPOLLRDNORM;
816 break;
817 case TIPC_OPEN:
818 if (tsk->group_is_open && !tsk->cong_link_cnt)
819 revents |= EPOLLOUT;
820 if (!tipc_sk_type_connectionless(sk))
821 break;
822 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
823 break;
824 revents |= EPOLLIN | EPOLLRDNORM;
825 break;
826 case TIPC_DISCONNECTING:
827 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
828 break;
829 }
830 return revents;
831}
832
833/**
834 * tipc_sendmcast - send multicast message
835 * @sock: socket structure
836 * @ua: destination address struct
837 * @msg: message to send
838 * @dlen: length of data to send
839 * @timeout: timeout to wait for wakeup
840 *
841 * Called from function tipc_sendmsg(), which has done all sanity checks
842 * Return: the number of bytes sent on success, or errno
843 */
844static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua,
845 struct msghdr *msg, size_t dlen, long timeout)
846{
847 struct sock *sk = sock->sk;
848 struct tipc_sock *tsk = tipc_sk(sk);
849 struct tipc_msg *hdr = &tsk->phdr;
850 struct net *net = sock_net(sk);
851 int mtu = tipc_bcast_get_mtu(net);
852 struct sk_buff_head pkts;
853 struct tipc_nlist dsts;
854 int rc;
855
856 if (tsk->group)
857 return -EACCES;
858
859 /* Block or return if any destination link is congested */
860 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
861 if (unlikely(rc))
862 return rc;
863
864 /* Lookup destination nodes */
865 tipc_nlist_init(&dsts, tipc_own_addr(net));
866 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts);
867 if (!dsts.local && !dsts.remote)
868 return -EHOSTUNREACH;
869
870 /* Build message header */
871 msg_set_type(hdr, TIPC_MCAST_MSG);
872 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
873 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
874 msg_set_destport(hdr, 0);
875 msg_set_destnode(hdr, 0);
876 msg_set_nametype(hdr, ua->sr.type);
877 msg_set_namelower(hdr, ua->sr.lower);
878 msg_set_nameupper(hdr, ua->sr.upper);
879
880 /* Build message as chain of buffers */
881 __skb_queue_head_init(&pkts);
882 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
883
884 /* Send message if build was successful */
885 if (unlikely(rc == dlen)) {
886 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
887 TIPC_DUMP_SK_SNDQ, " ");
888 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts,
889 &tsk->cong_link_cnt);
890 }
891
892 tipc_nlist_purge(&dsts);
893
894 return rc ? rc : dlen;
895}
896
897/**
898 * tipc_send_group_msg - send a message to a member in the group
899 * @net: network namespace
900 * @tsk: tipc socket
901 * @m: message to send
902 * @mb: group member
903 * @dnode: destination node
904 * @dport: destination port
905 * @dlen: total length of message data
906 */
907static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
908 struct msghdr *m, struct tipc_member *mb,
909 u32 dnode, u32 dport, int dlen)
910{
911 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
912 struct tipc_mc_method *method = &tsk->mc_method;
913 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
914 struct tipc_msg *hdr = &tsk->phdr;
915 struct sk_buff_head pkts;
916 int mtu, rc;
917
918 /* Complete message header */
919 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
920 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
921 msg_set_destport(hdr, dport);
922 msg_set_destnode(hdr, dnode);
923 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
924
925 /* Build message as chain of buffers */
926 __skb_queue_head_init(&pkts);
927 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
928 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
929 if (unlikely(rc != dlen))
930 return rc;
931
932 /* Send message */
933 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
934 if (unlikely(rc == -ELINKCONG)) {
935 tipc_dest_push(&tsk->cong_links, dnode, 0);
936 tsk->cong_link_cnt++;
937 }
938
939 /* Update send window */
940 tipc_group_update_member(mb, blks);
941
942 /* A broadcast sent within next EXPIRE period must follow same path */
943 method->rcast = true;
944 method->mandatory = true;
945 return dlen;
946}
947
948/**
949 * tipc_send_group_unicast - send message to a member in the group
950 * @sock: socket structure
951 * @m: message to send
952 * @dlen: total length of message data
953 * @timeout: timeout to wait for wakeup
954 *
955 * Called from function tipc_sendmsg(), which has done all sanity checks
956 * Return: the number of bytes sent on success, or errno
957 */
958static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
959 int dlen, long timeout)
960{
961 struct sock *sk = sock->sk;
962 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
963 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
964 struct tipc_sock *tsk = tipc_sk(sk);
965 struct net *net = sock_net(sk);
966 struct tipc_member *mb = NULL;
967 u32 node, port;
968 int rc;
969
970 node = ua->sk.node;
971 port = ua->sk.ref;
972 if (!port && !node)
973 return -EHOSTUNREACH;
974
975 /* Block or return if destination link or member is congested */
976 rc = tipc_wait_for_cond(sock, &timeout,
977 !tipc_dest_find(&tsk->cong_links, node, 0) &&
978 tsk->group &&
979 !tipc_group_cong(tsk->group, node, port, blks,
980 &mb));
981 if (unlikely(rc))
982 return rc;
983
984 if (unlikely(!mb))
985 return -EHOSTUNREACH;
986
987 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
988
989 return rc ? rc : dlen;
990}
991
992/**
993 * tipc_send_group_anycast - send message to any member with given identity
994 * @sock: socket structure
995 * @m: message to send
996 * @dlen: total length of message data
997 * @timeout: timeout to wait for wakeup
998 *
999 * Called from function tipc_sendmsg(), which has done all sanity checks
1000 * Return: the number of bytes sent on success, or errno
1001 */
1002static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
1003 int dlen, long timeout)
1004{
1005 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1006 struct sock *sk = sock->sk;
1007 struct tipc_sock *tsk = tipc_sk(sk);
1008 struct list_head *cong_links = &tsk->cong_links;
1009 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
1010 struct tipc_msg *hdr = &tsk->phdr;
1011 struct tipc_member *first = NULL;
1012 struct tipc_member *mbr = NULL;
1013 struct net *net = sock_net(sk);
1014 u32 node, port, exclude;
1015 struct list_head dsts;
1016 int lookups = 0;
1017 int dstcnt, rc;
1018 bool cong;
1019
1020 INIT_LIST_HEAD(&dsts);
1021 ua->sa.type = msg_nametype(hdr);
1022 ua->scope = msg_lookup_scope(hdr);
1023
1024 while (++lookups < 4) {
1025 exclude = tipc_group_exclude(tsk->group);
1026
1027 first = NULL;
1028
1029 /* Look for a non-congested destination member, if any */
1030 while (1) {
1031 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1032 exclude, false))
1033 return -EHOSTUNREACH;
1034 tipc_dest_pop(&dsts, &node, &port);
1035 cong = tipc_group_cong(tsk->group, node, port, blks,
1036 &mbr);
1037 if (!cong)
1038 break;
1039 if (mbr == first)
1040 break;
1041 if (!first)
1042 first = mbr;
1043 }
1044
1045 /* Start over if destination was not in member list */
1046 if (unlikely(!mbr))
1047 continue;
1048
1049 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1050 break;
1051
1052 /* Block or return if destination link or member is congested */
1053 rc = tipc_wait_for_cond(sock, &timeout,
1054 !tipc_dest_find(cong_links, node, 0) &&
1055 tsk->group &&
1056 !tipc_group_cong(tsk->group, node, port,
1057 blks, &mbr));
1058 if (unlikely(rc))
1059 return rc;
1060
1061 /* Send, unless destination disappeared while waiting */
1062 if (likely(mbr))
1063 break;
1064 }
1065
1066 if (unlikely(lookups >= 4))
1067 return -EHOSTUNREACH;
1068
1069 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1070
1071 return rc ? rc : dlen;
1072}
1073
1074/**
1075 * tipc_send_group_bcast - send message to all members in communication group
1076 * @sock: socket structure
1077 * @m: message to send
1078 * @dlen: total length of message data
1079 * @timeout: timeout to wait for wakeup
1080 *
1081 * Called from function tipc_sendmsg(), which has done all sanity checks
1082 * Return: the number of bytes sent on success, or errno
1083 */
1084static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1085 int dlen, long timeout)
1086{
1087 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1088 struct sock *sk = sock->sk;
1089 struct net *net = sock_net(sk);
1090 struct tipc_sock *tsk = tipc_sk(sk);
1091 struct tipc_nlist *dsts;
1092 struct tipc_mc_method *method = &tsk->mc_method;
1093 bool ack = method->mandatory && method->rcast;
1094 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1095 struct tipc_msg *hdr = &tsk->phdr;
1096 int mtu = tipc_bcast_get_mtu(net);
1097 struct sk_buff_head pkts;
1098 int rc = -EHOSTUNREACH;
1099
1100 /* Block or return if any destination link or member is congested */
1101 rc = tipc_wait_for_cond(sock, &timeout,
1102 !tsk->cong_link_cnt && tsk->group &&
1103 !tipc_group_bc_cong(tsk->group, blks));
1104 if (unlikely(rc))
1105 return rc;
1106
1107 dsts = tipc_group_dests(tsk->group);
1108 if (!dsts->local && !dsts->remote)
1109 return -EHOSTUNREACH;
1110
1111 /* Complete message header */
1112 if (ua) {
1113 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1114 msg_set_nameinst(hdr, ua->sa.instance);
1115 } else {
1116 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1117 msg_set_nameinst(hdr, 0);
1118 }
1119 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1120 msg_set_destport(hdr, 0);
1121 msg_set_destnode(hdr, 0);
1122 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1123
1124 /* Avoid getting stuck with repeated forced replicasts */
1125 msg_set_grp_bc_ack_req(hdr, ack);
1126
1127 /* Build message as chain of buffers */
1128 __skb_queue_head_init(&pkts);
1129 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1130 if (unlikely(rc != dlen))
1131 return rc;
1132
1133 /* Send message */
1134 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1135 if (unlikely(rc))
1136 return rc;
1137
1138 /* Update broadcast sequence number and send windows */
1139 tipc_group_update_bc_members(tsk->group, blks, ack);
1140
1141 /* Broadcast link is now free to choose method for next broadcast */
1142 method->mandatory = false;
1143 method->expires = jiffies;
1144
1145 return dlen;
1146}
1147
1148/**
1149 * tipc_send_group_mcast - send message to all members with given identity
1150 * @sock: socket structure
1151 * @m: message to send
1152 * @dlen: total length of message data
1153 * @timeout: timeout to wait for wakeup
1154 *
1155 * Called from function tipc_sendmsg(), which has done all sanity checks
1156 * Return: the number of bytes sent on success, or errno
1157 */
1158static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1159 int dlen, long timeout)
1160{
1161 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1162 struct sock *sk = sock->sk;
1163 struct tipc_sock *tsk = tipc_sk(sk);
1164 struct tipc_group *grp = tsk->group;
1165 struct tipc_msg *hdr = &tsk->phdr;
1166 struct net *net = sock_net(sk);
1167 struct list_head dsts;
1168 u32 dstcnt, exclude;
1169
1170 INIT_LIST_HEAD(&dsts);
1171 ua->sa.type = msg_nametype(hdr);
1172 ua->scope = msg_lookup_scope(hdr);
1173 exclude = tipc_group_exclude(grp);
1174
1175 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1176 return -EHOSTUNREACH;
1177
1178 if (dstcnt == 1) {
1179 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1180 return tipc_send_group_unicast(sock, m, dlen, timeout);
1181 }
1182
1183 tipc_dest_list_purge(&dsts);
1184 return tipc_send_group_bcast(sock, m, dlen, timeout);
1185}
1186
1187/**
1188 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1189 * @net: the associated network namespace
1190 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1191 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1192 *
1193 * Multi-threaded: parallel calls with reference to same queues may occur
1194 */
1195void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1196 struct sk_buff_head *inputq)
1197{
1198 u32 self = tipc_own_addr(net);
1199 struct sk_buff *skb, *_skb;
1200 u32 portid, onode;
1201 struct sk_buff_head tmpq;
1202 struct list_head dports;
1203 struct tipc_msg *hdr;
1204 struct tipc_uaddr ua;
1205 int user, mtyp, hlen;
1206
1207 __skb_queue_head_init(&tmpq);
1208 INIT_LIST_HEAD(&dports);
1209 ua.addrtype = TIPC_SERVICE_RANGE;
1210
1211 /* tipc_skb_peek() increments the head skb's reference counter */
1212 skb = tipc_skb_peek(arrvq, &inputq->lock);
1213 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1214 hdr = buf_msg(skb);
1215 user = msg_user(hdr);
1216 mtyp = msg_type(hdr);
1217 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1218 onode = msg_orignode(hdr);
1219 ua.sr.type = msg_nametype(hdr);
1220 ua.sr.lower = msg_namelower(hdr);
1221 ua.sr.upper = msg_nameupper(hdr);
1222 if (onode == self)
1223 ua.scope = TIPC_ANY_SCOPE;
1224 else
1225 ua.scope = TIPC_CLUSTER_SCOPE;
1226
1227 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1228 spin_lock_bh(&inputq->lock);
1229 if (skb_peek(arrvq) == skb) {
1230 __skb_dequeue(arrvq);
1231 __skb_queue_tail(inputq, skb);
1232 }
1233 kfree_skb(skb);
1234 spin_unlock_bh(&inputq->lock);
1235 continue;
1236 }
1237
1238 /* Group messages require exact scope match */
1239 if (msg_in_group(hdr)) {
1240 ua.sr.lower = 0;
1241 ua.sr.upper = ~0;
1242 ua.scope = msg_lookup_scope(hdr);
1243 }
1244
1245 /* Create destination port list: */
1246 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1247
1248 /* Clone message per destination */
1249 while (tipc_dest_pop(&dports, NULL, &portid)) {
1250 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1251 if (_skb) {
1252 msg_set_destport(buf_msg(_skb), portid);
1253 __skb_queue_tail(&tmpq, _skb);
1254 continue;
1255 }
1256 pr_warn("Failed to clone mcast rcv buffer\n");
1257 }
1258 /* Append clones to inputq only if skb is still head of arrvq */
1259 spin_lock_bh(&inputq->lock);
1260 if (skb_peek(arrvq) == skb) {
1261 skb_queue_splice_tail_init(&tmpq, inputq);
1262 /* Decrement the skb's refcnt */
1263 kfree_skb(__skb_dequeue(arrvq));
1264 }
1265 spin_unlock_bh(&inputq->lock);
1266 __skb_queue_purge(&tmpq);
1267 kfree_skb(skb);
1268 }
1269 tipc_sk_rcv(net, inputq);
1270}
1271
1272/* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1273 * when socket is in Nagle mode
1274 */
1275static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1276{
1277 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1278 struct sk_buff *skb = skb_peek_tail(txq);
1279 struct net *net = sock_net(&tsk->sk);
1280 u32 dnode = tsk_peer_node(tsk);
1281 int rc;
1282
1283 if (nagle_ack) {
1284 tsk->pkt_cnt += skb_queue_len(txq);
1285 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1286 tsk->oneway = 0;
1287 if (tsk->nagle_start < NAGLE_START_MAX)
1288 tsk->nagle_start *= 2;
1289 tsk->expect_ack = false;
1290 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1291 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1292 tsk->nagle_start);
1293 } else {
1294 tsk->nagle_start = NAGLE_START_INIT;
1295 if (skb) {
1296 msg_set_ack_required(buf_msg(skb));
1297 tsk->expect_ack = true;
1298 } else {
1299 tsk->expect_ack = false;
1300 }
1301 }
1302 tsk->msg_acc = 0;
1303 tsk->pkt_cnt = 0;
1304 }
1305
1306 if (!skb || tsk->cong_link_cnt)
1307 return;
1308
1309 /* Do not send SYN again after congestion */
1310 if (msg_is_syn(buf_msg(skb)))
1311 return;
1312
1313 if (tsk->msg_acc)
1314 tsk->pkt_cnt += skb_queue_len(txq);
1315 tsk->snt_unacked += tsk->snd_backlog;
1316 tsk->snd_backlog = 0;
1317 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1318 if (rc == -ELINKCONG)
1319 tsk->cong_link_cnt = 1;
1320}
1321
1322/**
1323 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1324 * @tsk: receiving socket
1325 * @skb: pointer to message buffer.
1326 * @inputq: buffer list containing the buffers
1327 * @xmitq: output message area
1328 */
1329static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1330 struct sk_buff_head *inputq,
1331 struct sk_buff_head *xmitq)
1332{
1333 struct tipc_msg *hdr = buf_msg(skb);
1334 u32 onode = tsk_own_node(tsk);
1335 struct sock *sk = &tsk->sk;
1336 int mtyp = msg_type(hdr);
1337 bool was_cong;
1338
1339 /* Ignore if connection cannot be validated: */
1340 if (!tsk_peer_msg(tsk, hdr)) {
1341 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1342 goto exit;
1343 }
1344
1345 if (unlikely(msg_errcode(hdr))) {
1346 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1347 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1348 tsk_peer_port(tsk));
1349 sk->sk_state_change(sk);
1350
1351 /* State change is ignored if socket already awake,
1352 * - convert msg to abort msg and add to inqueue
1353 */
1354 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1355 msg_set_type(hdr, TIPC_CONN_MSG);
1356 msg_set_size(hdr, BASIC_H_SIZE);
1357 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1358 __skb_queue_tail(inputq, skb);
1359 return;
1360 }
1361
1362 tsk->probe_unacked = false;
1363
1364 if (mtyp == CONN_PROBE) {
1365 msg_set_type(hdr, CONN_PROBE_REPLY);
1366 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1367 __skb_queue_tail(xmitq, skb);
1368 return;
1369 } else if (mtyp == CONN_ACK) {
1370 was_cong = tsk_conn_cong(tsk);
1371 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1372 tsk->snt_unacked -= msg_conn_ack(hdr);
1373 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1374 tsk->snd_win = msg_adv_win(hdr);
1375 if (was_cong && !tsk_conn_cong(tsk))
1376 sk->sk_write_space(sk);
1377 } else if (mtyp != CONN_PROBE_REPLY) {
1378 pr_warn("Received unknown CONN_PROTO msg\n");
1379 }
1380exit:
1381 kfree_skb(skb);
1382}
1383
1384/**
1385 * tipc_sendmsg - send message in connectionless manner
1386 * @sock: socket structure
1387 * @m: message to send
1388 * @dsz: amount of user data to be sent
1389 *
1390 * Message must have an destination specified explicitly.
1391 * Used for SOCK_RDM and SOCK_DGRAM messages,
1392 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1393 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1394 *
1395 * Return: the number of bytes sent on success, or errno otherwise
1396 */
1397static int tipc_sendmsg(struct socket *sock,
1398 struct msghdr *m, size_t dsz)
1399{
1400 struct sock *sk = sock->sk;
1401 int ret;
1402
1403 lock_sock(sk);
1404 ret = __tipc_sendmsg(sock, m, dsz);
1405 release_sock(sk);
1406
1407 return ret;
1408}
1409
1410static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1411{
1412 struct sock *sk = sock->sk;
1413 struct net *net = sock_net(sk);
1414 struct tipc_sock *tsk = tipc_sk(sk);
1415 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1416 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1417 struct list_head *clinks = &tsk->cong_links;
1418 bool syn = !tipc_sk_type_connectionless(sk);
1419 struct tipc_group *grp = tsk->group;
1420 struct tipc_msg *hdr = &tsk->phdr;
1421 struct tipc_socket_addr skaddr;
1422 struct sk_buff_head pkts;
1423 int atype, mtu, rc;
1424
1425 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1426 return -EMSGSIZE;
1427
1428 if (ua) {
1429 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1430 return -EINVAL;
1431 atype = ua->addrtype;
1432 }
1433
1434 /* If socket belongs to a communication group follow other paths */
1435 if (grp) {
1436 if (!ua)
1437 return tipc_send_group_bcast(sock, m, dlen, timeout);
1438 if (atype == TIPC_SERVICE_ADDR)
1439 return tipc_send_group_anycast(sock, m, dlen, timeout);
1440 if (atype == TIPC_SOCKET_ADDR)
1441 return tipc_send_group_unicast(sock, m, dlen, timeout);
1442 if (atype == TIPC_SERVICE_RANGE)
1443 return tipc_send_group_mcast(sock, m, dlen, timeout);
1444 return -EINVAL;
1445 }
1446
1447 if (!ua) {
1448 ua = (struct tipc_uaddr *)&tsk->peer;
1449 if (!syn && ua->family != AF_TIPC)
1450 return -EDESTADDRREQ;
1451 atype = ua->addrtype;
1452 }
1453
1454 if (unlikely(syn)) {
1455 if (sk->sk_state == TIPC_LISTEN)
1456 return -EPIPE;
1457 if (sk->sk_state != TIPC_OPEN)
1458 return -EISCONN;
1459 if (tsk->published)
1460 return -EOPNOTSUPP;
1461 if (atype == TIPC_SERVICE_ADDR)
1462 tsk->conn_addrtype = atype;
1463 msg_set_syn(hdr, 1);
1464 }
1465
1466 memset(&skaddr, 0, sizeof(skaddr));
1467
1468 /* Determine destination */
1469 if (atype == TIPC_SERVICE_RANGE) {
1470 return tipc_sendmcast(sock, ua, m, dlen, timeout);
1471 } else if (atype == TIPC_SERVICE_ADDR) {
1472 skaddr.node = ua->lookup_node;
1473 ua->scope = tipc_node2scope(skaddr.node);
1474 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr))
1475 return -EHOSTUNREACH;
1476 } else if (atype == TIPC_SOCKET_ADDR) {
1477 skaddr = ua->sk;
1478 } else {
1479 return -EINVAL;
1480 }
1481
1482 /* Block or return if destination link is congested */
1483 rc = tipc_wait_for_cond(sock, &timeout,
1484 !tipc_dest_find(clinks, skaddr.node, 0));
1485 if (unlikely(rc))
1486 return rc;
1487
1488 /* Finally build message header */
1489 msg_set_destnode(hdr, skaddr.node);
1490 msg_set_destport(hdr, skaddr.ref);
1491 if (atype == TIPC_SERVICE_ADDR) {
1492 msg_set_type(hdr, TIPC_NAMED_MSG);
1493 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1494 msg_set_nametype(hdr, ua->sa.type);
1495 msg_set_nameinst(hdr, ua->sa.instance);
1496 msg_set_lookup_scope(hdr, ua->scope);
1497 } else { /* TIPC_SOCKET_ADDR */
1498 msg_set_type(hdr, TIPC_DIRECT_MSG);
1499 msg_set_lookup_scope(hdr, 0);
1500 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1501 }
1502
1503 /* Add message body */
1504 __skb_queue_head_init(&pkts);
1505 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
1506 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1507 if (unlikely(rc != dlen))
1508 return rc;
1509 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1510 __skb_queue_purge(&pkts);
1511 return -ENOMEM;
1512 }
1513
1514 /* Send message */
1515 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1516 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid);
1517 if (unlikely(rc == -ELINKCONG)) {
1518 tipc_dest_push(clinks, skaddr.node, 0);
1519 tsk->cong_link_cnt++;
1520 rc = 0;
1521 }
1522
1523 if (unlikely(syn && !rc)) {
1524 tipc_set_sk_state(sk, TIPC_CONNECTING);
1525 if (dlen && timeout) {
1526 timeout = msecs_to_jiffies(timeout);
1527 tipc_wait_for_connect(sock, &timeout);
1528 }
1529 }
1530
1531 return rc ? rc : dlen;
1532}
1533
1534/**
1535 * tipc_sendstream - send stream-oriented data
1536 * @sock: socket structure
1537 * @m: data to send
1538 * @dsz: total length of data to be transmitted
1539 *
1540 * Used for SOCK_STREAM data.
1541 *
1542 * Return: the number of bytes sent on success (or partial success),
1543 * or errno if no data sent
1544 */
1545static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1546{
1547 struct sock *sk = sock->sk;
1548 int ret;
1549
1550 lock_sock(sk);
1551 ret = __tipc_sendstream(sock, m, dsz);
1552 release_sock(sk);
1553
1554 return ret;
1555}
1556
1557static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1558{
1559 struct sock *sk = sock->sk;
1560 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1561 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1562 struct sk_buff_head *txq = &sk->sk_write_queue;
1563 struct tipc_sock *tsk = tipc_sk(sk);
1564 struct tipc_msg *hdr = &tsk->phdr;
1565 struct net *net = sock_net(sk);
1566 struct sk_buff *skb;
1567 u32 dnode = tsk_peer_node(tsk);
1568 int maxnagle = tsk->maxnagle;
1569 int maxpkt = tsk->max_pkt;
1570 int send, sent = 0;
1571 int blocks, rc = 0;
1572
1573 if (unlikely(dlen > INT_MAX))
1574 return -EMSGSIZE;
1575
1576 /* Handle implicit connection setup */
1577 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) {
1578 rc = __tipc_sendmsg(sock, m, dlen);
1579 if (dlen && dlen == rc) {
1580 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1581 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1582 }
1583 return rc;
1584 }
1585
1586 do {
1587 rc = tipc_wait_for_cond(sock, &timeout,
1588 (!tsk->cong_link_cnt &&
1589 !tsk_conn_cong(tsk) &&
1590 tipc_sk_connected(sk)));
1591 if (unlikely(rc))
1592 break;
1593 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1594 blocks = tsk->snd_backlog;
1595 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1596 send <= maxnagle) {
1597 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1598 if (unlikely(rc < 0))
1599 break;
1600 blocks += rc;
1601 tsk->msg_acc++;
1602 if (blocks <= 64 && tsk->expect_ack) {
1603 tsk->snd_backlog = blocks;
1604 sent += send;
1605 break;
1606 } else if (blocks > 64) {
1607 tsk->pkt_cnt += skb_queue_len(txq);
1608 } else {
1609 skb = skb_peek_tail(txq);
1610 if (skb) {
1611 msg_set_ack_required(buf_msg(skb));
1612 tsk->expect_ack = true;
1613 } else {
1614 tsk->expect_ack = false;
1615 }
1616 tsk->msg_acc = 0;
1617 tsk->pkt_cnt = 0;
1618 }
1619 } else {
1620 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1621 if (unlikely(rc != send))
1622 break;
1623 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1624 }
1625 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1626 TIPC_DUMP_SK_SNDQ, " ");
1627 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1628 if (unlikely(rc == -ELINKCONG)) {
1629 tsk->cong_link_cnt = 1;
1630 rc = 0;
1631 }
1632 if (likely(!rc)) {
1633 tsk->snt_unacked += blocks;
1634 tsk->snd_backlog = 0;
1635 sent += send;
1636 }
1637 } while (sent < dlen && !rc);
1638
1639 return sent ? sent : rc;
1640}
1641
1642/**
1643 * tipc_send_packet - send a connection-oriented message
1644 * @sock: socket structure
1645 * @m: message to send
1646 * @dsz: length of data to be transmitted
1647 *
1648 * Used for SOCK_SEQPACKET messages.
1649 *
1650 * Return: the number of bytes sent on success, or errno otherwise
1651 */
1652static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1653{
1654 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1655 return -EMSGSIZE;
1656
1657 return tipc_sendstream(sock, m, dsz);
1658}
1659
1660/* tipc_sk_finish_conn - complete the setup of a connection
1661 */
1662static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1663 u32 peer_node)
1664{
1665 struct sock *sk = &tsk->sk;
1666 struct net *net = sock_net(sk);
1667 struct tipc_msg *msg = &tsk->phdr;
1668
1669 msg_set_syn(msg, 0);
1670 msg_set_destnode(msg, peer_node);
1671 msg_set_destport(msg, peer_port);
1672 msg_set_type(msg, TIPC_CONN_MSG);
1673 msg_set_lookup_scope(msg, 0);
1674 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1675
1676 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1677 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1678 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1679 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1680 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1681 tsk_set_nagle(tsk);
1682 __skb_queue_purge(&sk->sk_write_queue);
1683 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1684 return;
1685
1686 /* Fall back to message based flow control */
1687 tsk->rcv_win = FLOWCTL_MSG_WIN;
1688 tsk->snd_win = FLOWCTL_MSG_WIN;
1689}
1690
1691/**
1692 * tipc_sk_set_orig_addr - capture sender's address for received message
1693 * @m: descriptor for message info
1694 * @skb: received message
1695 *
1696 * Note: Address is not captured if not requested by receiver.
1697 */
1698static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1699{
1700 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1701 struct tipc_msg *hdr = buf_msg(skb);
1702
1703 if (!srcaddr)
1704 return;
1705
1706 srcaddr->sock.family = AF_TIPC;
1707 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1708 srcaddr->sock.scope = 0;
1709 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1710 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1711 srcaddr->sock.addr.name.domain = 0;
1712 m->msg_namelen = sizeof(struct sockaddr_tipc);
1713
1714 if (!msg_in_group(hdr))
1715 return;
1716
1717 /* Group message users may also want to know sending member's id */
1718 srcaddr->member.family = AF_TIPC;
1719 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1720 srcaddr->member.scope = 0;
1721 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1722 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1723 srcaddr->member.addr.name.domain = 0;
1724 m->msg_namelen = sizeof(*srcaddr);
1725}
1726
1727/**
1728 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1729 * @m: descriptor for message info
1730 * @skb: received message buffer
1731 * @tsk: TIPC port associated with message
1732 *
1733 * Note: Ancillary data is not captured if not requested by receiver.
1734 *
1735 * Return: 0 if successful, otherwise errno
1736 */
1737static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1738 struct tipc_sock *tsk)
1739{
1740 struct tipc_msg *hdr;
1741 u32 data[3] = {0,};
1742 bool has_addr;
1743 int dlen, rc;
1744
1745 if (likely(m->msg_controllen == 0))
1746 return 0;
1747
1748 hdr = buf_msg(skb);
1749 dlen = msg_data_sz(hdr);
1750
1751 /* Capture errored message object, if any */
1752 if (msg_errcode(hdr)) {
1753 if (skb_linearize(skb))
1754 return -ENOMEM;
1755 hdr = buf_msg(skb);
1756 data[0] = msg_errcode(hdr);
1757 data[1] = dlen;
1758 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1759 if (rc || !dlen)
1760 return rc;
1761 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1762 if (rc)
1763 return rc;
1764 }
1765
1766 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1767 switch (msg_type(hdr)) {
1768 case TIPC_NAMED_MSG:
1769 has_addr = true;
1770 data[0] = msg_nametype(hdr);
1771 data[1] = msg_namelower(hdr);
1772 data[2] = data[1];
1773 break;
1774 case TIPC_MCAST_MSG:
1775 has_addr = true;
1776 data[0] = msg_nametype(hdr);
1777 data[1] = msg_namelower(hdr);
1778 data[2] = msg_nameupper(hdr);
1779 break;
1780 case TIPC_CONN_MSG:
1781 has_addr = !!tsk->conn_addrtype;
1782 data[0] = msg_nametype(&tsk->phdr);
1783 data[1] = msg_nameinst(&tsk->phdr);
1784 data[2] = data[1];
1785 break;
1786 default:
1787 has_addr = false;
1788 }
1789 if (!has_addr)
1790 return 0;
1791 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1792}
1793
1794static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1795{
1796 struct sock *sk = &tsk->sk;
1797 struct sk_buff *skb = NULL;
1798 struct tipc_msg *msg;
1799 u32 peer_port = tsk_peer_port(tsk);
1800 u32 dnode = tsk_peer_node(tsk);
1801
1802 if (!tipc_sk_connected(sk))
1803 return NULL;
1804 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1805 dnode, tsk_own_node(tsk), peer_port,
1806 tsk->portid, TIPC_OK);
1807 if (!skb)
1808 return NULL;
1809 msg = buf_msg(skb);
1810 msg_set_conn_ack(msg, tsk->rcv_unacked);
1811 tsk->rcv_unacked = 0;
1812
1813 /* Adjust to and advertize the correct window limit */
1814 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1815 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1816 msg_set_adv_win(msg, tsk->rcv_win);
1817 }
1818 return skb;
1819}
1820
1821static void tipc_sk_send_ack(struct tipc_sock *tsk)
1822{
1823 struct sk_buff *skb;
1824
1825 skb = tipc_sk_build_ack(tsk);
1826 if (!skb)
1827 return;
1828
1829 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1830 msg_link_selector(buf_msg(skb)));
1831}
1832
1833static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1834{
1835 struct sock *sk = sock->sk;
1836 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1837 long timeo = *timeop;
1838 int err = sock_error(sk);
1839
1840 if (err)
1841 return err;
1842
1843 for (;;) {
1844 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1845 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1846 err = -ENOTCONN;
1847 break;
1848 }
1849 add_wait_queue(sk_sleep(sk), &wait);
1850 release_sock(sk);
1851 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1852 sched_annotate_sleep();
1853 lock_sock(sk);
1854 remove_wait_queue(sk_sleep(sk), &wait);
1855 }
1856 err = 0;
1857 if (!skb_queue_empty(&sk->sk_receive_queue))
1858 break;
1859 err = -EAGAIN;
1860 if (!timeo)
1861 break;
1862 err = sock_intr_errno(timeo);
1863 if (signal_pending(current))
1864 break;
1865
1866 err = sock_error(sk);
1867 if (err)
1868 break;
1869 }
1870 *timeop = timeo;
1871 return err;
1872}
1873
1874/**
1875 * tipc_recvmsg - receive packet-oriented message
1876 * @sock: network socket
1877 * @m: descriptor for message info
1878 * @buflen: length of user buffer area
1879 * @flags: receive flags
1880 *
1881 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1882 * If the complete message doesn't fit in user area, truncate it.
1883 *
1884 * Return: size of returned message data, errno otherwise
1885 */
1886static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1887 size_t buflen, int flags)
1888{
1889 struct sock *sk = sock->sk;
1890 bool connected = !tipc_sk_type_connectionless(sk);
1891 struct tipc_sock *tsk = tipc_sk(sk);
1892 int rc, err, hlen, dlen, copy;
1893 struct tipc_skb_cb *skb_cb;
1894 struct sk_buff_head xmitq;
1895 struct tipc_msg *hdr;
1896 struct sk_buff *skb;
1897 bool grp_evt;
1898 long timeout;
1899
1900 /* Catch invalid receive requests */
1901 if (unlikely(!buflen))
1902 return -EINVAL;
1903
1904 lock_sock(sk);
1905 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1906 rc = -ENOTCONN;
1907 goto exit;
1908 }
1909 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1910
1911 /* Step rcv queue to first msg with data or error; wait if necessary */
1912 do {
1913 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1914 if (unlikely(rc))
1915 goto exit;
1916 skb = skb_peek(&sk->sk_receive_queue);
1917 skb_cb = TIPC_SKB_CB(skb);
1918 hdr = buf_msg(skb);
1919 dlen = msg_data_sz(hdr);
1920 hlen = msg_hdr_sz(hdr);
1921 err = msg_errcode(hdr);
1922 grp_evt = msg_is_grp_evt(hdr);
1923 if (likely(dlen || err))
1924 break;
1925 tsk_advance_rx_queue(sk);
1926 } while (1);
1927
1928 /* Collect msg meta data, including error code and rejected data */
1929 tipc_sk_set_orig_addr(m, skb);
1930 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1931 if (unlikely(rc))
1932 goto exit;
1933 hdr = buf_msg(skb);
1934
1935 /* Capture data if non-error msg, otherwise just set return value */
1936 if (likely(!err)) {
1937 int offset = skb_cb->bytes_read;
1938
1939 copy = min_t(int, dlen - offset, buflen);
1940 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1941 if (unlikely(rc))
1942 goto exit;
1943 if (unlikely(offset + copy < dlen)) {
1944 if (flags & MSG_EOR) {
1945 if (!(flags & MSG_PEEK))
1946 skb_cb->bytes_read = offset + copy;
1947 } else {
1948 m->msg_flags |= MSG_TRUNC;
1949 skb_cb->bytes_read = 0;
1950 }
1951 } else {
1952 if (flags & MSG_EOR)
1953 m->msg_flags |= MSG_EOR;
1954 skb_cb->bytes_read = 0;
1955 }
1956 } else {
1957 copy = 0;
1958 rc = 0;
1959 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) {
1960 rc = -ECONNRESET;
1961 goto exit;
1962 }
1963 }
1964
1965 /* Mark message as group event if applicable */
1966 if (unlikely(grp_evt)) {
1967 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1968 m->msg_flags |= MSG_EOR;
1969 m->msg_flags |= MSG_OOB;
1970 copy = 0;
1971 }
1972
1973 /* Caption of data or error code/rejected data was successful */
1974 if (unlikely(flags & MSG_PEEK))
1975 goto exit;
1976
1977 /* Send group flow control advertisement when applicable */
1978 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1979 __skb_queue_head_init(&xmitq);
1980 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1981 msg_orignode(hdr), msg_origport(hdr),
1982 &xmitq);
1983 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1984 }
1985
1986 if (skb_cb->bytes_read)
1987 goto exit;
1988
1989 tsk_advance_rx_queue(sk);
1990
1991 if (likely(!connected))
1992 goto exit;
1993
1994 /* Send connection flow control advertisement when applicable */
1995 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1996 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1997 tipc_sk_send_ack(tsk);
1998exit:
1999 release_sock(sk);
2000 return rc ? rc : copy;
2001}
2002
2003/**
2004 * tipc_recvstream - receive stream-oriented data
2005 * @sock: network socket
2006 * @m: descriptor for message info
2007 * @buflen: total size of user buffer area
2008 * @flags: receive flags
2009 *
2010 * Used for SOCK_STREAM messages only. If not enough data is available
2011 * will optionally wait for more; never truncates data.
2012 *
2013 * Return: size of returned message data, errno otherwise
2014 */
2015static int tipc_recvstream(struct socket *sock, struct msghdr *m,
2016 size_t buflen, int flags)
2017{
2018 struct sock *sk = sock->sk;
2019 struct tipc_sock *tsk = tipc_sk(sk);
2020 struct sk_buff *skb;
2021 struct tipc_msg *hdr;
2022 struct tipc_skb_cb *skb_cb;
2023 bool peek = flags & MSG_PEEK;
2024 int offset, required, copy, copied = 0;
2025 int hlen, dlen, err, rc;
2026 long timeout;
2027
2028 /* Catch invalid receive attempts */
2029 if (unlikely(!buflen))
2030 return -EINVAL;
2031
2032 lock_sock(sk);
2033
2034 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2035 rc = -ENOTCONN;
2036 goto exit;
2037 }
2038 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2039 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2040
2041 do {
2042 /* Look at first msg in receive queue; wait if necessary */
2043 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2044 if (unlikely(rc))
2045 break;
2046 skb = skb_peek(&sk->sk_receive_queue);
2047 skb_cb = TIPC_SKB_CB(skb);
2048 hdr = buf_msg(skb);
2049 dlen = msg_data_sz(hdr);
2050 hlen = msg_hdr_sz(hdr);
2051 err = msg_errcode(hdr);
2052
2053 /* Discard any empty non-errored (SYN-) message */
2054 if (unlikely(!dlen && !err)) {
2055 tsk_advance_rx_queue(sk);
2056 continue;
2057 }
2058
2059 /* Collect msg meta data, incl. error code and rejected data */
2060 if (!copied) {
2061 tipc_sk_set_orig_addr(m, skb);
2062 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2063 if (rc)
2064 break;
2065 hdr = buf_msg(skb);
2066 }
2067
2068 /* Copy data if msg ok, otherwise return error/partial data */
2069 if (likely(!err)) {
2070 offset = skb_cb->bytes_read;
2071 copy = min_t(int, dlen - offset, buflen - copied);
2072 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2073 if (unlikely(rc))
2074 break;
2075 copied += copy;
2076 offset += copy;
2077 if (unlikely(offset < dlen)) {
2078 if (!peek)
2079 skb_cb->bytes_read = offset;
2080 break;
2081 }
2082 } else {
2083 rc = 0;
2084 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2085 rc = -ECONNRESET;
2086 if (copied || rc)
2087 break;
2088 }
2089
2090 if (unlikely(peek))
2091 break;
2092
2093 tsk_advance_rx_queue(sk);
2094
2095 /* Send connection flow control advertisement when applicable */
2096 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2097 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2098 tipc_sk_send_ack(tsk);
2099
2100 /* Exit if all requested data or FIN/error received */
2101 if (copied == buflen || err)
2102 break;
2103
2104 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2105exit:
2106 release_sock(sk);
2107 return copied ? copied : rc;
2108}
2109
2110/**
2111 * tipc_write_space - wake up thread if port congestion is released
2112 * @sk: socket
2113 */
2114static void tipc_write_space(struct sock *sk)
2115{
2116 struct socket_wq *wq;
2117
2118 rcu_read_lock();
2119 wq = rcu_dereference(sk->sk_wq);
2120 if (skwq_has_sleeper(wq))
2121 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2122 EPOLLWRNORM | EPOLLWRBAND);
2123 rcu_read_unlock();
2124}
2125
2126/**
2127 * tipc_data_ready - wake up threads to indicate messages have been received
2128 * @sk: socket
2129 */
2130static void tipc_data_ready(struct sock *sk)
2131{
2132 struct socket_wq *wq;
2133
2134 trace_sk_data_ready(sk);
2135
2136 rcu_read_lock();
2137 wq = rcu_dereference(sk->sk_wq);
2138 if (skwq_has_sleeper(wq))
2139 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2140 EPOLLRDNORM | EPOLLRDBAND);
2141 rcu_read_unlock();
2142}
2143
2144static void tipc_sock_destruct(struct sock *sk)
2145{
2146 __skb_queue_purge(&sk->sk_receive_queue);
2147}
2148
2149static void tipc_sk_proto_rcv(struct sock *sk,
2150 struct sk_buff_head *inputq,
2151 struct sk_buff_head *xmitq)
2152{
2153 struct sk_buff *skb = __skb_dequeue(inputq);
2154 struct tipc_sock *tsk = tipc_sk(sk);
2155 struct tipc_msg *hdr = buf_msg(skb);
2156 struct tipc_group *grp = tsk->group;
2157 bool wakeup = false;
2158
2159 switch (msg_user(hdr)) {
2160 case CONN_MANAGER:
2161 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2162 return;
2163 case SOCK_WAKEUP:
2164 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2165 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2166 smp_wmb();
2167 tsk->cong_link_cnt--;
2168 wakeup = true;
2169 tipc_sk_push_backlog(tsk, false);
2170 break;
2171 case GROUP_PROTOCOL:
2172 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2173 break;
2174 case TOP_SRV:
2175 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2176 hdr, inputq, xmitq);
2177 break;
2178 default:
2179 break;
2180 }
2181
2182 if (wakeup)
2183 sk->sk_write_space(sk);
2184
2185 kfree_skb(skb);
2186}
2187
2188/**
2189 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2190 * @tsk: TIPC socket
2191 * @skb: pointer to message buffer.
2192 * @xmitq: for Nagle ACK if any
2193 * Return: true if message should be added to receive queue, false otherwise
2194 */
2195static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2196 struct sk_buff_head *xmitq)
2197{
2198 struct sock *sk = &tsk->sk;
2199 struct net *net = sock_net(sk);
2200 struct tipc_msg *hdr = buf_msg(skb);
2201 bool con_msg = msg_connected(hdr);
2202 u32 pport = tsk_peer_port(tsk);
2203 u32 pnode = tsk_peer_node(tsk);
2204 u32 oport = msg_origport(hdr);
2205 u32 onode = msg_orignode(hdr);
2206 int err = msg_errcode(hdr);
2207 unsigned long delay;
2208
2209 if (unlikely(msg_mcast(hdr)))
2210 return false;
2211 tsk->oneway = 0;
2212
2213 switch (sk->sk_state) {
2214 case TIPC_CONNECTING:
2215 /* Setup ACK */
2216 if (likely(con_msg)) {
2217 if (err)
2218 break;
2219 tipc_sk_finish_conn(tsk, oport, onode);
2220 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2221 /* ACK+ message with data is added to receive queue */
2222 if (msg_data_sz(hdr))
2223 return true;
2224 /* Empty ACK-, - wake up sleeping connect() and drop */
2225 sk->sk_state_change(sk);
2226 msg_set_dest_droppable(hdr, 1);
2227 return false;
2228 }
2229 /* Ignore connectionless message if not from listening socket */
2230 if (oport != pport || onode != pnode)
2231 return false;
2232
2233 /* Rejected SYN */
2234 if (err != TIPC_ERR_OVERLOAD)
2235 break;
2236
2237 /* Prepare for new setup attempt if we have a SYN clone */
2238 if (skb_queue_empty(&sk->sk_write_queue))
2239 break;
2240 get_random_bytes(&delay, 2);
2241 delay %= (tsk->conn_timeout / 4);
2242 delay = msecs_to_jiffies(delay + 100);
2243 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2244 return false;
2245 case TIPC_OPEN:
2246 case TIPC_DISCONNECTING:
2247 return false;
2248 case TIPC_LISTEN:
2249 /* Accept only SYN message */
2250 if (!msg_is_syn(hdr) &&
2251 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2252 return false;
2253 if (!con_msg && !err)
2254 return true;
2255 return false;
2256 case TIPC_ESTABLISHED:
2257 if (!skb_queue_empty(&sk->sk_write_queue))
2258 tipc_sk_push_backlog(tsk, false);
2259 /* Accept only connection-based messages sent by peer */
2260 if (likely(con_msg && !err && pport == oport &&
2261 pnode == onode)) {
2262 if (msg_ack_required(hdr)) {
2263 struct sk_buff *skb;
2264
2265 skb = tipc_sk_build_ack(tsk);
2266 if (skb) {
2267 msg_set_nagle_ack(buf_msg(skb));
2268 __skb_queue_tail(xmitq, skb);
2269 }
2270 }
2271 return true;
2272 }
2273 if (!tsk_peer_msg(tsk, hdr))
2274 return false;
2275 if (!err)
2276 return true;
2277 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2278 tipc_node_remove_conn(net, pnode, tsk->portid);
2279 sk->sk_state_change(sk);
2280 return true;
2281 default:
2282 pr_err("Unknown sk_state %u\n", sk->sk_state);
2283 }
2284 /* Abort connection setup attempt */
2285 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2286 sk->sk_err = ECONNREFUSED;
2287 sk->sk_state_change(sk);
2288 return true;
2289}
2290
2291/**
2292 * rcvbuf_limit - get proper overload limit of socket receive queue
2293 * @sk: socket
2294 * @skb: message
2295 *
2296 * For connection oriented messages, irrespective of importance,
2297 * default queue limit is 2 MB.
2298 *
2299 * For connectionless messages, queue limits are based on message
2300 * importance as follows:
2301 *
2302 * TIPC_LOW_IMPORTANCE (2 MB)
2303 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2304 * TIPC_HIGH_IMPORTANCE (8 MB)
2305 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2306 *
2307 * Return: overload limit according to corresponding message importance
2308 */
2309static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2310{
2311 struct tipc_sock *tsk = tipc_sk(sk);
2312 struct tipc_msg *hdr = buf_msg(skb);
2313
2314 if (unlikely(msg_in_group(hdr)))
2315 return READ_ONCE(sk->sk_rcvbuf);
2316
2317 if (unlikely(!msg_connected(hdr)))
2318 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2319
2320 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2321 return READ_ONCE(sk->sk_rcvbuf);
2322
2323 return FLOWCTL_MSG_LIM;
2324}
2325
2326/**
2327 * tipc_sk_filter_rcv - validate incoming message
2328 * @sk: socket
2329 * @skb: pointer to message.
2330 * @xmitq: output message area (FIXME)
2331 *
2332 * Enqueues message on receive queue if acceptable; optionally handles
2333 * disconnect indication for a connected socket.
2334 *
2335 * Called with socket lock already taken
2336 */
2337static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2338 struct sk_buff_head *xmitq)
2339{
2340 bool sk_conn = !tipc_sk_type_connectionless(sk);
2341 struct tipc_sock *tsk = tipc_sk(sk);
2342 struct tipc_group *grp = tsk->group;
2343 struct tipc_msg *hdr = buf_msg(skb);
2344 struct net *net = sock_net(sk);
2345 struct sk_buff_head inputq;
2346 int mtyp = msg_type(hdr);
2347 int limit, err = TIPC_OK;
2348
2349 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2350 TIPC_SKB_CB(skb)->bytes_read = 0;
2351 __skb_queue_head_init(&inputq);
2352 __skb_queue_tail(&inputq, skb);
2353
2354 if (unlikely(!msg_isdata(hdr)))
2355 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2356
2357 if (unlikely(grp))
2358 tipc_group_filter_msg(grp, &inputq, xmitq);
2359
2360 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2361 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2362
2363 /* Validate and add to receive buffer if there is space */
2364 while ((skb = __skb_dequeue(&inputq))) {
2365 hdr = buf_msg(skb);
2366 limit = rcvbuf_limit(sk, skb);
2367 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2368 (!sk_conn && msg_connected(hdr)) ||
2369 (!grp && msg_in_group(hdr)))
2370 err = TIPC_ERR_NO_PORT;
2371 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2372 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2373 "err_overload2!");
2374 atomic_inc(&sk->sk_drops);
2375 err = TIPC_ERR_OVERLOAD;
2376 }
2377
2378 if (unlikely(err)) {
2379 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2380 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2381 "@filter_rcv!");
2382 __skb_queue_tail(xmitq, skb);
2383 }
2384 err = TIPC_OK;
2385 continue;
2386 }
2387 __skb_queue_tail(&sk->sk_receive_queue, skb);
2388 skb_set_owner_r(skb, sk);
2389 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2390 "rcvq >90% allocated!");
2391 sk->sk_data_ready(sk);
2392 }
2393}
2394
2395/**
2396 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2397 * @sk: socket
2398 * @skb: message
2399 *
2400 * Caller must hold socket lock
2401 */
2402static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2403{
2404 unsigned int before = sk_rmem_alloc_get(sk);
2405 struct sk_buff_head xmitq;
2406 unsigned int added;
2407
2408 __skb_queue_head_init(&xmitq);
2409
2410 tipc_sk_filter_rcv(sk, skb, &xmitq);
2411 added = sk_rmem_alloc_get(sk) - before;
2412 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2413
2414 /* Send pending response/rejected messages, if any */
2415 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2416 return 0;
2417}
2418
2419/**
2420 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2421 * inputq and try adding them to socket or backlog queue
2422 * @inputq: list of incoming buffers with potentially different destinations
2423 * @sk: socket where the buffers should be enqueued
2424 * @dport: port number for the socket
2425 * @xmitq: output queue
2426 *
2427 * Caller must hold socket lock
2428 */
2429static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2430 u32 dport, struct sk_buff_head *xmitq)
2431{
2432 unsigned long time_limit = jiffies + usecs_to_jiffies(20000);
2433 struct sk_buff *skb;
2434 unsigned int lim;
2435 atomic_t *dcnt;
2436 u32 onode;
2437
2438 while (skb_queue_len(inputq)) {
2439 if (unlikely(time_after_eq(jiffies, time_limit)))
2440 return;
2441
2442 skb = tipc_skb_dequeue(inputq, dport);
2443 if (unlikely(!skb))
2444 return;
2445
2446 /* Add message directly to receive queue if possible */
2447 if (!sock_owned_by_user(sk)) {
2448 tipc_sk_filter_rcv(sk, skb, xmitq);
2449 continue;
2450 }
2451
2452 /* Try backlog, compensating for double-counted bytes */
2453 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2454 if (!sk->sk_backlog.len)
2455 atomic_set(dcnt, 0);
2456 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2457 if (likely(!sk_add_backlog(sk, skb, lim))) {
2458 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2459 "bklg & rcvq >90% allocated!");
2460 continue;
2461 }
2462
2463 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2464 /* Overload => reject message back to sender */
2465 onode = tipc_own_addr(sock_net(sk));
2466 atomic_inc(&sk->sk_drops);
2467 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2468 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2469 "@sk_enqueue!");
2470 __skb_queue_tail(xmitq, skb);
2471 }
2472 break;
2473 }
2474}
2475
2476/**
2477 * tipc_sk_rcv - handle a chain of incoming buffers
2478 * @net: the associated network namespace
2479 * @inputq: buffer list containing the buffers
2480 * Consumes all buffers in list until inputq is empty
2481 * Note: may be called in multiple threads referring to the same queue
2482 */
2483void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2484{
2485 struct sk_buff_head xmitq;
2486 u32 dnode, dport = 0;
2487 int err;
2488 struct tipc_sock *tsk;
2489 struct sock *sk;
2490 struct sk_buff *skb;
2491
2492 __skb_queue_head_init(&xmitq);
2493 while (skb_queue_len(inputq)) {
2494 dport = tipc_skb_peek_port(inputq, dport);
2495 tsk = tipc_sk_lookup(net, dport);
2496
2497 if (likely(tsk)) {
2498 sk = &tsk->sk;
2499 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2500 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2501 spin_unlock_bh(&sk->sk_lock.slock);
2502 }
2503 /* Send pending response/rejected messages, if any */
2504 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2505 sock_put(sk);
2506 continue;
2507 }
2508 /* No destination socket => dequeue skb if still there */
2509 skb = tipc_skb_dequeue(inputq, dport);
2510 if (!skb)
2511 return;
2512
2513 /* Try secondary lookup if unresolved named message */
2514 err = TIPC_ERR_NO_PORT;
2515 if (tipc_msg_lookup_dest(net, skb, &err))
2516 goto xmit;
2517
2518 /* Prepare for message rejection */
2519 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2520 continue;
2521
2522 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2523xmit:
2524 dnode = msg_destnode(buf_msg(skb));
2525 tipc_node_xmit_skb(net, skb, dnode, dport);
2526 }
2527}
2528
2529static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2530{
2531 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2532 struct sock *sk = sock->sk;
2533 int done;
2534
2535 do {
2536 int err = sock_error(sk);
2537 if (err)
2538 return err;
2539 if (!*timeo_p)
2540 return -ETIMEDOUT;
2541 if (signal_pending(current))
2542 return sock_intr_errno(*timeo_p);
2543 if (sk->sk_state == TIPC_DISCONNECTING)
2544 break;
2545
2546 add_wait_queue(sk_sleep(sk), &wait);
2547 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2548 &wait);
2549 remove_wait_queue(sk_sleep(sk), &wait);
2550 } while (!done);
2551 return 0;
2552}
2553
2554static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2555{
2556 if (addr->family != AF_TIPC)
2557 return false;
2558 if (addr->addrtype == TIPC_SERVICE_RANGE)
2559 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2560 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2561 addr->addrtype == TIPC_SOCKET_ADDR);
2562}
2563
2564/**
2565 * tipc_connect - establish a connection to another TIPC port
2566 * @sock: socket structure
2567 * @dest: socket address for destination port
2568 * @destlen: size of socket address data structure
2569 * @flags: file-related flags associated with socket
2570 *
2571 * Return: 0 on success, errno otherwise
2572 */
2573static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2574 int destlen, int flags)
2575{
2576 struct sock *sk = sock->sk;
2577 struct tipc_sock *tsk = tipc_sk(sk);
2578 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2579 struct msghdr m = {NULL,};
2580 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2581 int previous;
2582 int res = 0;
2583
2584 if (destlen != sizeof(struct sockaddr_tipc))
2585 return -EINVAL;
2586
2587 lock_sock(sk);
2588
2589 if (tsk->group) {
2590 res = -EINVAL;
2591 goto exit;
2592 }
2593
2594 if (dst->family == AF_UNSPEC) {
2595 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2596 if (!tipc_sk_type_connectionless(sk))
2597 res = -EINVAL;
2598 goto exit;
2599 }
2600 if (!tipc_sockaddr_is_sane(dst)) {
2601 res = -EINVAL;
2602 goto exit;
2603 }
2604 /* DGRAM/RDM connect(), just save the destaddr */
2605 if (tipc_sk_type_connectionless(sk)) {
2606 memcpy(&tsk->peer, dest, destlen);
2607 goto exit;
2608 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2609 res = -EINVAL;
2610 goto exit;
2611 }
2612
2613 previous = sk->sk_state;
2614
2615 switch (sk->sk_state) {
2616 case TIPC_OPEN:
2617 /* Send a 'SYN-' to destination */
2618 m.msg_name = dest;
2619 m.msg_namelen = destlen;
2620 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2621
2622 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2623 * indicate send_msg() is never blocked.
2624 */
2625 if (!timeout)
2626 m.msg_flags = MSG_DONTWAIT;
2627
2628 res = __tipc_sendmsg(sock, &m, 0);
2629 if ((res < 0) && (res != -EWOULDBLOCK))
2630 goto exit;
2631
2632 /* Just entered TIPC_CONNECTING state; the only
2633 * difference is that return value in non-blocking
2634 * case is EINPROGRESS, rather than EALREADY.
2635 */
2636 res = -EINPROGRESS;
2637 fallthrough;
2638 case TIPC_CONNECTING:
2639 if (!timeout) {
2640 if (previous == TIPC_CONNECTING)
2641 res = -EALREADY;
2642 goto exit;
2643 }
2644 timeout = msecs_to_jiffies(timeout);
2645 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2646 res = tipc_wait_for_connect(sock, &timeout);
2647 break;
2648 case TIPC_ESTABLISHED:
2649 res = -EISCONN;
2650 break;
2651 default:
2652 res = -EINVAL;
2653 }
2654
2655exit:
2656 release_sock(sk);
2657 return res;
2658}
2659
2660/**
2661 * tipc_listen - allow socket to listen for incoming connections
2662 * @sock: socket structure
2663 * @len: (unused)
2664 *
2665 * Return: 0 on success, errno otherwise
2666 */
2667static int tipc_listen(struct socket *sock, int len)
2668{
2669 struct sock *sk = sock->sk;
2670 int res;
2671
2672 lock_sock(sk);
2673 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2674 release_sock(sk);
2675
2676 return res;
2677}
2678
2679static int tipc_wait_for_accept(struct socket *sock, long timeo)
2680{
2681 struct sock *sk = sock->sk;
2682 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2683 int err;
2684
2685 /* True wake-one mechanism for incoming connections: only
2686 * one process gets woken up, not the 'whole herd'.
2687 * Since we do not 'race & poll' for established sockets
2688 * anymore, the common case will execute the loop only once.
2689 */
2690 for (;;) {
2691 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2692 add_wait_queue(sk_sleep(sk), &wait);
2693 release_sock(sk);
2694 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
2695 lock_sock(sk);
2696 remove_wait_queue(sk_sleep(sk), &wait);
2697 }
2698 err = 0;
2699 if (!skb_queue_empty(&sk->sk_receive_queue))
2700 break;
2701 err = -EAGAIN;
2702 if (!timeo)
2703 break;
2704 err = sock_intr_errno(timeo);
2705 if (signal_pending(current))
2706 break;
2707 }
2708 return err;
2709}
2710
2711/**
2712 * tipc_accept - wait for connection request
2713 * @sock: listening socket
2714 * @new_sock: new socket that is to be connected
2715 * @flags: file-related flags associated with socket
2716 * @kern: caused by kernel or by userspace?
2717 *
2718 * Return: 0 on success, errno otherwise
2719 */
2720static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2721 bool kern)
2722{
2723 struct sock *new_sk, *sk = sock->sk;
2724 struct tipc_sock *new_tsock;
2725 struct msghdr m = {NULL,};
2726 struct tipc_msg *msg;
2727 struct sk_buff *buf;
2728 long timeo;
2729 int res;
2730
2731 lock_sock(sk);
2732
2733 if (sk->sk_state != TIPC_LISTEN) {
2734 res = -EINVAL;
2735 goto exit;
2736 }
2737 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2738 res = tipc_wait_for_accept(sock, timeo);
2739 if (res)
2740 goto exit;
2741
2742 buf = skb_peek(&sk->sk_receive_queue);
2743
2744 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2745 if (res)
2746 goto exit;
2747 security_sk_clone(sock->sk, new_sock->sk);
2748
2749 new_sk = new_sock->sk;
2750 new_tsock = tipc_sk(new_sk);
2751 msg = buf_msg(buf);
2752
2753 /* we lock on new_sk; but lockdep sees the lock on sk */
2754 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2755
2756 /*
2757 * Reject any stray messages received by new socket
2758 * before the socket lock was taken (very, very unlikely)
2759 */
2760 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2761
2762 /* Connect new socket to it's peer */
2763 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2764
2765 tsk_set_importance(new_sk, msg_importance(msg));
2766 if (msg_named(msg)) {
2767 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2768 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2769 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2770 }
2771
2772 /*
2773 * Respond to 'SYN-' by discarding it & returning 'ACK'.
2774 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'.
2775 */
2776 if (!msg_data_sz(msg)) {
2777 tsk_advance_rx_queue(sk);
2778 } else {
2779 __skb_dequeue(&sk->sk_receive_queue);
2780 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2781 skb_set_owner_r(buf, new_sk);
2782 }
2783 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2784 __tipc_sendstream(new_sock, &m, 0);
2785 release_sock(new_sk);
2786exit:
2787 release_sock(sk);
2788 return res;
2789}
2790
2791/**
2792 * tipc_shutdown - shutdown socket connection
2793 * @sock: socket structure
2794 * @how: direction to close (must be SHUT_RDWR)
2795 *
2796 * Terminates connection (if necessary), then purges socket's receive queue.
2797 *
2798 * Return: 0 on success, errno otherwise
2799 */
2800static int tipc_shutdown(struct socket *sock, int how)
2801{
2802 struct sock *sk = sock->sk;
2803 int res;
2804
2805 if (how != SHUT_RDWR)
2806 return -EINVAL;
2807
2808 lock_sock(sk);
2809
2810 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2811 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2812 sk->sk_shutdown = SHUTDOWN_MASK;
2813
2814 if (sk->sk_state == TIPC_DISCONNECTING) {
2815 /* Discard any unreceived messages */
2816 __skb_queue_purge(&sk->sk_receive_queue);
2817
2818 res = 0;
2819 } else {
2820 res = -ENOTCONN;
2821 }
2822 /* Wake up anyone sleeping in poll. */
2823 sk->sk_state_change(sk);
2824
2825 release_sock(sk);
2826 return res;
2827}
2828
2829static void tipc_sk_check_probing_state(struct sock *sk,
2830 struct sk_buff_head *list)
2831{
2832 struct tipc_sock *tsk = tipc_sk(sk);
2833 u32 pnode = tsk_peer_node(tsk);
2834 u32 pport = tsk_peer_port(tsk);
2835 u32 self = tsk_own_node(tsk);
2836 u32 oport = tsk->portid;
2837 struct sk_buff *skb;
2838
2839 if (tsk->probe_unacked) {
2840 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2841 sk->sk_err = ECONNABORTED;
2842 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2843 sk->sk_state_change(sk);
2844 return;
2845 }
2846 /* Prepare new probe */
2847 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2848 pnode, self, pport, oport, TIPC_OK);
2849 if (skb)
2850 __skb_queue_tail(list, skb);
2851 tsk->probe_unacked = true;
2852 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2853}
2854
2855static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2856{
2857 struct tipc_sock *tsk = tipc_sk(sk);
2858
2859 /* Try again later if dest link is congested */
2860 if (tsk->cong_link_cnt) {
2861 sk_reset_timer(sk, &sk->sk_timer,
2862 jiffies + msecs_to_jiffies(100));
2863 return;
2864 }
2865 /* Prepare SYN for retransmit */
2866 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2867}
2868
2869static void tipc_sk_timeout(struct timer_list *t)
2870{
2871 struct sock *sk = from_timer(sk, t, sk_timer);
2872 struct tipc_sock *tsk = tipc_sk(sk);
2873 u32 pnode = tsk_peer_node(tsk);
2874 struct sk_buff_head list;
2875 int rc = 0;
2876
2877 __skb_queue_head_init(&list);
2878 bh_lock_sock(sk);
2879
2880 /* Try again later if socket is busy */
2881 if (sock_owned_by_user(sk)) {
2882 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2883 bh_unlock_sock(sk);
2884 sock_put(sk);
2885 return;
2886 }
2887
2888 if (sk->sk_state == TIPC_ESTABLISHED)
2889 tipc_sk_check_probing_state(sk, &list);
2890 else if (sk->sk_state == TIPC_CONNECTING)
2891 tipc_sk_retry_connect(sk, &list);
2892
2893 bh_unlock_sock(sk);
2894
2895 if (!skb_queue_empty(&list))
2896 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2897
2898 /* SYN messages may cause link congestion */
2899 if (rc == -ELINKCONG) {
2900 tipc_dest_push(&tsk->cong_links, pnode, 0);
2901 tsk->cong_link_cnt = 1;
2902 }
2903 sock_put(sk);
2904}
2905
2906static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2907{
2908 struct sock *sk = &tsk->sk;
2909 struct net *net = sock_net(sk);
2910 struct tipc_socket_addr skaddr;
2911 struct publication *p;
2912 u32 key;
2913
2914 if (tipc_sk_connected(sk))
2915 return -EINVAL;
2916 key = tsk->portid + tsk->pub_count + 1;
2917 if (key == tsk->portid)
2918 return -EADDRINUSE;
2919 skaddr.ref = tsk->portid;
2920 skaddr.node = tipc_own_addr(net);
2921 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2922 if (unlikely(!p))
2923 return -EINVAL;
2924
2925 list_add(&p->binding_sock, &tsk->publications);
2926 tsk->pub_count++;
2927 tsk->published = true;
2928 return 0;
2929}
2930
2931static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2932{
2933 struct net *net = sock_net(&tsk->sk);
2934 struct publication *safe, *p;
2935 struct tipc_uaddr _ua;
2936 int rc = -EINVAL;
2937
2938 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2939 if (!ua) {
2940 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2941 p->sr.type, p->sr.lower, p->sr.upper);
2942 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2943 continue;
2944 }
2945 /* Unbind specific publication */
2946 if (p->scope != ua->scope)
2947 continue;
2948 if (p->sr.type != ua->sr.type)
2949 continue;
2950 if (p->sr.lower != ua->sr.lower)
2951 continue;
2952 if (p->sr.upper != ua->sr.upper)
2953 break;
2954 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2955 rc = 0;
2956 break;
2957 }
2958 if (list_empty(&tsk->publications)) {
2959 tsk->published = 0;
2960 rc = 0;
2961 }
2962 return rc;
2963}
2964
2965/* tipc_sk_reinit: set non-zero address in all existing sockets
2966 * when we go from standalone to network mode.
2967 */
2968void tipc_sk_reinit(struct net *net)
2969{
2970 struct tipc_net *tn = net_generic(net, tipc_net_id);
2971 struct rhashtable_iter iter;
2972 struct tipc_sock *tsk;
2973 struct tipc_msg *msg;
2974
2975 rhashtable_walk_enter(&tn->sk_rht, &iter);
2976
2977 do {
2978 rhashtable_walk_start(&iter);
2979
2980 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2981 sock_hold(&tsk->sk);
2982 rhashtable_walk_stop(&iter);
2983 lock_sock(&tsk->sk);
2984 msg = &tsk->phdr;
2985 msg_set_prevnode(msg, tipc_own_addr(net));
2986 msg_set_orignode(msg, tipc_own_addr(net));
2987 release_sock(&tsk->sk);
2988 rhashtable_walk_start(&iter);
2989 sock_put(&tsk->sk);
2990 }
2991
2992 rhashtable_walk_stop(&iter);
2993 } while (tsk == ERR_PTR(-EAGAIN));
2994
2995 rhashtable_walk_exit(&iter);
2996}
2997
2998static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2999{
3000 struct tipc_net *tn = net_generic(net, tipc_net_id);
3001 struct tipc_sock *tsk;
3002
3003 rcu_read_lock();
3004 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
3005 if (tsk)
3006 sock_hold(&tsk->sk);
3007 rcu_read_unlock();
3008
3009 return tsk;
3010}
3011
3012static int tipc_sk_insert(struct tipc_sock *tsk)
3013{
3014 struct sock *sk = &tsk->sk;
3015 struct net *net = sock_net(sk);
3016 struct tipc_net *tn = net_generic(net, tipc_net_id);
3017 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
3018 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT;
3019
3020 while (remaining--) {
3021 portid++;
3022 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
3023 portid = TIPC_MIN_PORT;
3024 tsk->portid = portid;
3025 sock_hold(&tsk->sk);
3026 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3027 tsk_rht_params))
3028 return 0;
3029 sock_put(&tsk->sk);
3030 }
3031
3032 return -1;
3033}
3034
3035static void tipc_sk_remove(struct tipc_sock *tsk)
3036{
3037 struct sock *sk = &tsk->sk;
3038 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3039
3040 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3041 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3042 __sock_put(sk);
3043 }
3044}
3045
3046static const struct rhashtable_params tsk_rht_params = {
3047 .nelem_hint = 192,
3048 .head_offset = offsetof(struct tipc_sock, node),
3049 .key_offset = offsetof(struct tipc_sock, portid),
3050 .key_len = sizeof(u32), /* portid */
3051 .max_size = 1048576,
3052 .min_size = 256,
3053 .automatic_shrinking = true,
3054};
3055
3056int tipc_sk_rht_init(struct net *net)
3057{
3058 struct tipc_net *tn = net_generic(net, tipc_net_id);
3059
3060 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3061}
3062
3063void tipc_sk_rht_destroy(struct net *net)
3064{
3065 struct tipc_net *tn = net_generic(net, tipc_net_id);
3066
3067 /* Wait for socket readers to complete */
3068 synchronize_net();
3069
3070 rhashtable_destroy(&tn->sk_rht);
3071}
3072
3073static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3074{
3075 struct net *net = sock_net(&tsk->sk);
3076 struct tipc_group *grp = tsk->group;
3077 struct tipc_msg *hdr = &tsk->phdr;
3078 struct tipc_uaddr ua;
3079 int rc;
3080
3081 if (mreq->type < TIPC_RESERVED_TYPES)
3082 return -EACCES;
3083 if (mreq->scope > TIPC_NODE_SCOPE)
3084 return -EINVAL;
3085 if (mreq->scope != TIPC_NODE_SCOPE)
3086 mreq->scope = TIPC_CLUSTER_SCOPE;
3087 if (grp)
3088 return -EACCES;
3089 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3090 if (!grp)
3091 return -ENOMEM;
3092 tsk->group = grp;
3093 msg_set_lookup_scope(hdr, mreq->scope);
3094 msg_set_nametype(hdr, mreq->type);
3095 msg_set_dest_droppable(hdr, true);
3096 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3097 mreq->type, mreq->instance, mreq->instance);
3098 tipc_nametbl_build_group(net, grp, &ua);
3099 rc = tipc_sk_publish(tsk, &ua);
3100 if (rc) {
3101 tipc_group_delete(net, grp);
3102 tsk->group = NULL;
3103 return rc;
3104 }
3105 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3106 tsk->mc_method.rcast = true;
3107 tsk->mc_method.mandatory = true;
3108 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3109 return rc;
3110}
3111
3112static int tipc_sk_leave(struct tipc_sock *tsk)
3113{
3114 struct net *net = sock_net(&tsk->sk);
3115 struct tipc_group *grp = tsk->group;
3116 struct tipc_uaddr ua;
3117 int scope;
3118
3119 if (!grp)
3120 return -EINVAL;
3121 ua.addrtype = TIPC_SERVICE_RANGE;
3122 tipc_group_self(grp, &ua.sr, &scope);
3123 ua.scope = scope;
3124 tipc_group_delete(net, grp);
3125 tsk->group = NULL;
3126 tipc_sk_withdraw(tsk, &ua);
3127 return 0;
3128}
3129
3130/**
3131 * tipc_setsockopt - set socket option
3132 * @sock: socket structure
3133 * @lvl: option level
3134 * @opt: option identifier
3135 * @ov: pointer to new option value
3136 * @ol: length of option value
3137 *
3138 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3139 * (to ease compatibility).
3140 *
3141 * Return: 0 on success, errno otherwise
3142 */
3143static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3144 sockptr_t ov, unsigned int ol)
3145{
3146 struct sock *sk = sock->sk;
3147 struct tipc_sock *tsk = tipc_sk(sk);
3148 struct tipc_group_req mreq;
3149 u32 value = 0;
3150 int res = 0;
3151
3152 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3153 return 0;
3154 if (lvl != SOL_TIPC)
3155 return -ENOPROTOOPT;
3156
3157 switch (opt) {
3158 case TIPC_IMPORTANCE:
3159 case TIPC_SRC_DROPPABLE:
3160 case TIPC_DEST_DROPPABLE:
3161 case TIPC_CONN_TIMEOUT:
3162 case TIPC_NODELAY:
3163 if (ol < sizeof(value))
3164 return -EINVAL;
3165 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3166 return -EFAULT;
3167 break;
3168 case TIPC_GROUP_JOIN:
3169 if (ol < sizeof(mreq))
3170 return -EINVAL;
3171 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3172 return -EFAULT;
3173 break;
3174 default:
3175 if (!sockptr_is_null(ov) || ol)
3176 return -EINVAL;
3177 }
3178
3179 lock_sock(sk);
3180
3181 switch (opt) {
3182 case TIPC_IMPORTANCE:
3183 res = tsk_set_importance(sk, value);
3184 break;
3185 case TIPC_SRC_DROPPABLE:
3186 if (sock->type != SOCK_STREAM)
3187 tsk_set_unreliable(tsk, value);
3188 else
3189 res = -ENOPROTOOPT;
3190 break;
3191 case TIPC_DEST_DROPPABLE:
3192 tsk_set_unreturnable(tsk, value);
3193 break;
3194 case TIPC_CONN_TIMEOUT:
3195 tipc_sk(sk)->conn_timeout = value;
3196 break;
3197 case TIPC_MCAST_BROADCAST:
3198 tsk->mc_method.rcast = false;
3199 tsk->mc_method.mandatory = true;
3200 break;
3201 case TIPC_MCAST_REPLICAST:
3202 tsk->mc_method.rcast = true;
3203 tsk->mc_method.mandatory = true;
3204 break;
3205 case TIPC_GROUP_JOIN:
3206 res = tipc_sk_join(tsk, &mreq);
3207 break;
3208 case TIPC_GROUP_LEAVE:
3209 res = tipc_sk_leave(tsk);
3210 break;
3211 case TIPC_NODELAY:
3212 tsk->nodelay = !!value;
3213 tsk_set_nagle(tsk);
3214 break;
3215 default:
3216 res = -EINVAL;
3217 }
3218
3219 release_sock(sk);
3220
3221 return res;
3222}
3223
3224/**
3225 * tipc_getsockopt - get socket option
3226 * @sock: socket structure
3227 * @lvl: option level
3228 * @opt: option identifier
3229 * @ov: receptacle for option value
3230 * @ol: receptacle for length of option value
3231 *
3232 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3233 * (to ease compatibility).
3234 *
3235 * Return: 0 on success, errno otherwise
3236 */
3237static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3238 char __user *ov, int __user *ol)
3239{
3240 struct sock *sk = sock->sk;
3241 struct tipc_sock *tsk = tipc_sk(sk);
3242 struct tipc_service_range seq;
3243 int len, scope;
3244 u32 value;
3245 int res;
3246
3247 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3248 return put_user(0, ol);
3249 if (lvl != SOL_TIPC)
3250 return -ENOPROTOOPT;
3251 res = get_user(len, ol);
3252 if (res)
3253 return res;
3254
3255 lock_sock(sk);
3256
3257 switch (opt) {
3258 case TIPC_IMPORTANCE:
3259 value = tsk_importance(tsk);
3260 break;
3261 case TIPC_SRC_DROPPABLE:
3262 value = tsk_unreliable(tsk);
3263 break;
3264 case TIPC_DEST_DROPPABLE:
3265 value = tsk_unreturnable(tsk);
3266 break;
3267 case TIPC_CONN_TIMEOUT:
3268 value = tsk->conn_timeout;
3269 /* no need to set "res", since already 0 at this point */
3270 break;
3271 case TIPC_NODE_RECVQ_DEPTH:
3272 value = 0; /* was tipc_queue_size, now obsolete */
3273 break;
3274 case TIPC_SOCK_RECVQ_DEPTH:
3275 value = skb_queue_len(&sk->sk_receive_queue);
3276 break;
3277 case TIPC_SOCK_RECVQ_USED:
3278 value = sk_rmem_alloc_get(sk);
3279 break;
3280 case TIPC_GROUP_JOIN:
3281 seq.type = 0;
3282 if (tsk->group)
3283 tipc_group_self(tsk->group, &seq, &scope);
3284 value = seq.type;
3285 break;
3286 default:
3287 res = -EINVAL;
3288 }
3289
3290 release_sock(sk);
3291
3292 if (res)
3293 return res; /* "get" failed */
3294
3295 if (len < sizeof(value))
3296 return -EINVAL;
3297
3298 if (copy_to_user(ov, &value, sizeof(value)))
3299 return -EFAULT;
3300
3301 return put_user(sizeof(value), ol);
3302}
3303
3304static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3305{
3306 struct net *net = sock_net(sock->sk);
3307 struct tipc_sioc_nodeid_req nr = {0};
3308 struct tipc_sioc_ln_req lnr;
3309 void __user *argp = (void __user *)arg;
3310
3311 switch (cmd) {
3312 case SIOCGETLINKNAME:
3313 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3314 return -EFAULT;
3315 if (!tipc_node_get_linkname(net,
3316 lnr.bearer_id & 0xffff, lnr.peer,
3317 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3318 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3319 return -EFAULT;
3320 return 0;
3321 }
3322 return -EADDRNOTAVAIL;
3323 case SIOCGETNODEID:
3324 if (copy_from_user(&nr, argp, sizeof(nr)))
3325 return -EFAULT;
3326 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3327 return -EADDRNOTAVAIL;
3328 if (copy_to_user(argp, &nr, sizeof(nr)))
3329 return -EFAULT;
3330 return 0;
3331 default:
3332 return -ENOIOCTLCMD;
3333 }
3334}
3335
3336static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3337{
3338 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3339 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3340 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3341
3342 tsk1->peer.family = AF_TIPC;
3343 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3344 tsk1->peer.scope = TIPC_NODE_SCOPE;
3345 tsk1->peer.addr.id.ref = tsk2->portid;
3346 tsk1->peer.addr.id.node = onode;
3347 tsk2->peer.family = AF_TIPC;
3348 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3349 tsk2->peer.scope = TIPC_NODE_SCOPE;
3350 tsk2->peer.addr.id.ref = tsk1->portid;
3351 tsk2->peer.addr.id.node = onode;
3352
3353 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3354 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3355 return 0;
3356}
3357
3358/* Protocol switches for the various types of TIPC sockets */
3359
3360static const struct proto_ops msg_ops = {
3361 .owner = THIS_MODULE,
3362 .family = AF_TIPC,
3363 .release = tipc_release,
3364 .bind = tipc_bind,
3365 .connect = tipc_connect,
3366 .socketpair = tipc_socketpair,
3367 .accept = sock_no_accept,
3368 .getname = tipc_getname,
3369 .poll = tipc_poll,
3370 .ioctl = tipc_ioctl,
3371 .listen = sock_no_listen,
3372 .shutdown = tipc_shutdown,
3373 .setsockopt = tipc_setsockopt,
3374 .getsockopt = tipc_getsockopt,
3375 .sendmsg = tipc_sendmsg,
3376 .recvmsg = tipc_recvmsg,
3377 .mmap = sock_no_mmap,
3378};
3379
3380static const struct proto_ops packet_ops = {
3381 .owner = THIS_MODULE,
3382 .family = AF_TIPC,
3383 .release = tipc_release,
3384 .bind = tipc_bind,
3385 .connect = tipc_connect,
3386 .socketpair = tipc_socketpair,
3387 .accept = tipc_accept,
3388 .getname = tipc_getname,
3389 .poll = tipc_poll,
3390 .ioctl = tipc_ioctl,
3391 .listen = tipc_listen,
3392 .shutdown = tipc_shutdown,
3393 .setsockopt = tipc_setsockopt,
3394 .getsockopt = tipc_getsockopt,
3395 .sendmsg = tipc_send_packet,
3396 .recvmsg = tipc_recvmsg,
3397 .mmap = sock_no_mmap,
3398};
3399
3400static const struct proto_ops stream_ops = {
3401 .owner = THIS_MODULE,
3402 .family = AF_TIPC,
3403 .release = tipc_release,
3404 .bind = tipc_bind,
3405 .connect = tipc_connect,
3406 .socketpair = tipc_socketpair,
3407 .accept = tipc_accept,
3408 .getname = tipc_getname,
3409 .poll = tipc_poll,
3410 .ioctl = tipc_ioctl,
3411 .listen = tipc_listen,
3412 .shutdown = tipc_shutdown,
3413 .setsockopt = tipc_setsockopt,
3414 .getsockopt = tipc_getsockopt,
3415 .sendmsg = tipc_sendstream,
3416 .recvmsg = tipc_recvstream,
3417 .mmap = sock_no_mmap,
3418};
3419
3420static const struct net_proto_family tipc_family_ops = {
3421 .owner = THIS_MODULE,
3422 .family = AF_TIPC,
3423 .create = tipc_sk_create
3424};
3425
3426static struct proto tipc_proto = {
3427 .name = "TIPC",
3428 .owner = THIS_MODULE,
3429 .obj_size = sizeof(struct tipc_sock),
3430 .sysctl_rmem = sysctl_tipc_rmem
3431};
3432
3433/**
3434 * tipc_socket_init - initialize TIPC socket interface
3435 *
3436 * Return: 0 on success, errno otherwise
3437 */
3438int tipc_socket_init(void)
3439{
3440 int res;
3441
3442 res = proto_register(&tipc_proto, 1);
3443 if (res) {
3444 pr_err("Failed to register TIPC protocol type\n");
3445 goto out;
3446 }
3447
3448 res = sock_register(&tipc_family_ops);
3449 if (res) {
3450 pr_err("Failed to register TIPC socket type\n");
3451 proto_unregister(&tipc_proto);
3452 goto out;
3453 }
3454 out:
3455 return res;
3456}
3457
3458/**
3459 * tipc_socket_stop - stop TIPC socket interface
3460 */
3461void tipc_socket_stop(void)
3462{
3463 sock_unregister(tipc_family_ops.family);
3464 proto_unregister(&tipc_proto);
3465}
3466
3467/* Caller should hold socket lock for the passed tipc socket. */
3468static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3469{
3470 u32 peer_node, peer_port;
3471 u32 conn_type, conn_instance;
3472 struct nlattr *nest;
3473
3474 peer_node = tsk_peer_node(tsk);
3475 peer_port = tsk_peer_port(tsk);
3476 conn_type = msg_nametype(&tsk->phdr);
3477 conn_instance = msg_nameinst(&tsk->phdr);
3478 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3479 if (!nest)
3480 return -EMSGSIZE;
3481
3482 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3483 goto msg_full;
3484 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3485 goto msg_full;
3486
3487 if (tsk->conn_addrtype != 0) {
3488 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3489 goto msg_full;
3490 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3491 goto msg_full;
3492 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3493 goto msg_full;
3494 }
3495 nla_nest_end(skb, nest);
3496
3497 return 0;
3498
3499msg_full:
3500 nla_nest_cancel(skb, nest);
3501
3502 return -EMSGSIZE;
3503}
3504
3505static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3506 *tsk)
3507{
3508 struct net *net = sock_net(skb->sk);
3509 struct sock *sk = &tsk->sk;
3510
3511 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3512 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3513 return -EMSGSIZE;
3514
3515 if (tipc_sk_connected(sk)) {
3516 if (__tipc_nl_add_sk_con(skb, tsk))
3517 return -EMSGSIZE;
3518 } else if (!list_empty(&tsk->publications)) {
3519 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3520 return -EMSGSIZE;
3521 }
3522 return 0;
3523}
3524
3525/* Caller should hold socket lock for the passed tipc socket. */
3526static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3527 struct tipc_sock *tsk)
3528{
3529 struct nlattr *attrs;
3530 void *hdr;
3531
3532 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3533 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3534 if (!hdr)
3535 goto msg_cancel;
3536
3537 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3538 if (!attrs)
3539 goto genlmsg_cancel;
3540
3541 if (__tipc_nl_add_sk_info(skb, tsk))
3542 goto attr_msg_cancel;
3543
3544 nla_nest_end(skb, attrs);
3545 genlmsg_end(skb, hdr);
3546
3547 return 0;
3548
3549attr_msg_cancel:
3550 nla_nest_cancel(skb, attrs);
3551genlmsg_cancel:
3552 genlmsg_cancel(skb, hdr);
3553msg_cancel:
3554 return -EMSGSIZE;
3555}
3556
3557int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3558 int (*skb_handler)(struct sk_buff *skb,
3559 struct netlink_callback *cb,
3560 struct tipc_sock *tsk))
3561{
3562 struct rhashtable_iter *iter = (void *)cb->args[4];
3563 struct tipc_sock *tsk;
3564 int err;
3565
3566 rhashtable_walk_start(iter);
3567 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3568 if (IS_ERR(tsk)) {
3569 err = PTR_ERR(tsk);
3570 if (err == -EAGAIN) {
3571 err = 0;
3572 continue;
3573 }
3574 break;
3575 }
3576
3577 sock_hold(&tsk->sk);
3578 rhashtable_walk_stop(iter);
3579 lock_sock(&tsk->sk);
3580 err = skb_handler(skb, cb, tsk);
3581 if (err) {
3582 release_sock(&tsk->sk);
3583 sock_put(&tsk->sk);
3584 goto out;
3585 }
3586 release_sock(&tsk->sk);
3587 rhashtable_walk_start(iter);
3588 sock_put(&tsk->sk);
3589 }
3590 rhashtable_walk_stop(iter);
3591out:
3592 return skb->len;
3593}
3594EXPORT_SYMBOL(tipc_nl_sk_walk);
3595
3596int tipc_dump_start(struct netlink_callback *cb)
3597{
3598 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3599}
3600EXPORT_SYMBOL(tipc_dump_start);
3601
3602int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3603{
3604 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3605 struct rhashtable_iter *iter = (void *)cb->args[4];
3606 struct tipc_net *tn = tipc_net(net);
3607
3608 if (!iter) {
3609 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3610 if (!iter)
3611 return -ENOMEM;
3612
3613 cb->args[4] = (long)iter;
3614 }
3615
3616 rhashtable_walk_enter(&tn->sk_rht, iter);
3617 return 0;
3618}
3619
3620int tipc_dump_done(struct netlink_callback *cb)
3621{
3622 struct rhashtable_iter *hti = (void *)cb->args[4];
3623
3624 rhashtable_walk_exit(hti);
3625 kfree(hti);
3626 return 0;
3627}
3628EXPORT_SYMBOL(tipc_dump_done);
3629
3630int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3631 struct tipc_sock *tsk, u32 sk_filter_state,
3632 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3633{
3634 struct sock *sk = &tsk->sk;
3635 struct nlattr *attrs;
3636 struct nlattr *stat;
3637
3638 /*filter response w.r.t sk_state*/
3639 if (!(sk_filter_state & (1 << sk->sk_state)))
3640 return 0;
3641
3642 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3643 if (!attrs)
3644 goto msg_cancel;
3645
3646 if (__tipc_nl_add_sk_info(skb, tsk))
3647 goto attr_msg_cancel;
3648
3649 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3650 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3651 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3652 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3653 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3654 sock_i_uid(sk))) ||
3655 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3656 tipc_diag_gen_cookie(sk),
3657 TIPC_NLA_SOCK_PAD))
3658 goto attr_msg_cancel;
3659
3660 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3661 if (!stat)
3662 goto attr_msg_cancel;
3663
3664 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3665 skb_queue_len(&sk->sk_receive_queue)) ||
3666 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3667 skb_queue_len(&sk->sk_write_queue)) ||
3668 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3669 atomic_read(&sk->sk_drops)))
3670 goto stat_msg_cancel;
3671
3672 if (tsk->cong_link_cnt &&
3673 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3674 goto stat_msg_cancel;
3675
3676 if (tsk_conn_cong(tsk) &&
3677 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3678 goto stat_msg_cancel;
3679
3680 nla_nest_end(skb, stat);
3681
3682 if (tsk->group)
3683 if (tipc_group_fill_sock_diag(tsk->group, skb))
3684 goto stat_msg_cancel;
3685
3686 nla_nest_end(skb, attrs);
3687
3688 return 0;
3689
3690stat_msg_cancel:
3691 nla_nest_cancel(skb, stat);
3692attr_msg_cancel:
3693 nla_nest_cancel(skb, attrs);
3694msg_cancel:
3695 return -EMSGSIZE;
3696}
3697EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3698
3699int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3700{
3701 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3702}
3703
3704/* Caller should hold socket lock for the passed tipc socket. */
3705static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3706 struct netlink_callback *cb,
3707 struct publication *publ)
3708{
3709 void *hdr;
3710 struct nlattr *attrs;
3711
3712 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3713 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3714 if (!hdr)
3715 goto msg_cancel;
3716
3717 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3718 if (!attrs)
3719 goto genlmsg_cancel;
3720
3721 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3722 goto attr_msg_cancel;
3723 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3724 goto attr_msg_cancel;
3725 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3726 goto attr_msg_cancel;
3727 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3728 goto attr_msg_cancel;
3729
3730 nla_nest_end(skb, attrs);
3731 genlmsg_end(skb, hdr);
3732
3733 return 0;
3734
3735attr_msg_cancel:
3736 nla_nest_cancel(skb, attrs);
3737genlmsg_cancel:
3738 genlmsg_cancel(skb, hdr);
3739msg_cancel:
3740 return -EMSGSIZE;
3741}
3742
3743/* Caller should hold socket lock for the passed tipc socket. */
3744static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3745 struct netlink_callback *cb,
3746 struct tipc_sock *tsk, u32 *last_publ)
3747{
3748 int err;
3749 struct publication *p;
3750
3751 if (*last_publ) {
3752 list_for_each_entry(p, &tsk->publications, binding_sock) {
3753 if (p->key == *last_publ)
3754 break;
3755 }
3756 if (list_entry_is_head(p, &tsk->publications, binding_sock)) {
3757 /* We never set seq or call nl_dump_check_consistent()
3758 * this means that setting prev_seq here will cause the
3759 * consistence check to fail in the netlink callback
3760 * handler. Resulting in the last NLMSG_DONE message
3761 * having the NLM_F_DUMP_INTR flag set.
3762 */
3763 cb->prev_seq = 1;
3764 *last_publ = 0;
3765 return -EPIPE;
3766 }
3767 } else {
3768 p = list_first_entry(&tsk->publications, struct publication,
3769 binding_sock);
3770 }
3771
3772 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3773 err = __tipc_nl_add_sk_publ(skb, cb, p);
3774 if (err) {
3775 *last_publ = p->key;
3776 return err;
3777 }
3778 }
3779 *last_publ = 0;
3780
3781 return 0;
3782}
3783
3784int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3785{
3786 int err;
3787 u32 tsk_portid = cb->args[0];
3788 u32 last_publ = cb->args[1];
3789 u32 done = cb->args[2];
3790 struct net *net = sock_net(skb->sk);
3791 struct tipc_sock *tsk;
3792
3793 if (!tsk_portid) {
3794 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
3795 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3796
3797 if (!attrs[TIPC_NLA_SOCK])
3798 return -EINVAL;
3799
3800 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3801 attrs[TIPC_NLA_SOCK],
3802 tipc_nl_sock_policy, NULL);
3803 if (err)
3804 return err;
3805
3806 if (!sock[TIPC_NLA_SOCK_REF])
3807 return -EINVAL;
3808
3809 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3810 }
3811
3812 if (done)
3813 return 0;
3814
3815 tsk = tipc_sk_lookup(net, tsk_portid);
3816 if (!tsk)
3817 return -EINVAL;
3818
3819 lock_sock(&tsk->sk);
3820 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3821 if (!err)
3822 done = 1;
3823 release_sock(&tsk->sk);
3824 sock_put(&tsk->sk);
3825
3826 cb->args[0] = tsk_portid;
3827 cb->args[1] = last_publ;
3828 cb->args[2] = done;
3829
3830 return skb->len;
3831}
3832
3833/**
3834 * tipc_sk_filtering - check if a socket should be traced
3835 * @sk: the socket to be examined
3836 *
3837 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3838 * (portid, sock type, name type, name lower, name upper)
3839 *
3840 * Return: true if the socket meets the socket tuple data
3841 * (value 0 = 'any') or when there is no tuple set (all = 0),
3842 * otherwise false
3843 */
3844bool tipc_sk_filtering(struct sock *sk)
3845{
3846 struct tipc_sock *tsk;
3847 struct publication *p;
3848 u32 _port, _sktype, _type, _lower, _upper;
3849 u32 type = 0, lower = 0, upper = 0;
3850
3851 if (!sk)
3852 return true;
3853
3854 tsk = tipc_sk(sk);
3855
3856 _port = sysctl_tipc_sk_filter[0];
3857 _sktype = sysctl_tipc_sk_filter[1];
3858 _type = sysctl_tipc_sk_filter[2];
3859 _lower = sysctl_tipc_sk_filter[3];
3860 _upper = sysctl_tipc_sk_filter[4];
3861
3862 if (!_port && !_sktype && !_type && !_lower && !_upper)
3863 return true;
3864
3865 if (_port)
3866 return (_port == tsk->portid);
3867
3868 if (_sktype && _sktype != sk->sk_type)
3869 return false;
3870
3871 if (tsk->published) {
3872 p = list_first_entry_or_null(&tsk->publications,
3873 struct publication, binding_sock);
3874 if (p) {
3875 type = p->sr.type;
3876 lower = p->sr.lower;
3877 upper = p->sr.upper;
3878 }
3879 }
3880
3881 if (!tipc_sk_type_connectionless(sk)) {
3882 type = msg_nametype(&tsk->phdr);
3883 lower = msg_nameinst(&tsk->phdr);
3884 upper = lower;
3885 }
3886
3887 if ((_type && _type != type) || (_lower && _lower != lower) ||
3888 (_upper && _upper != upper))
3889 return false;
3890
3891 return true;
3892}
3893
3894u32 tipc_sock_get_portid(struct sock *sk)
3895{
3896 return (sk) ? (tipc_sk(sk))->portid : 0;
3897}
3898
3899/**
3900 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3901 * both the rcv and backlog queues are considered
3902 * @sk: tipc sk to be checked
3903 * @skb: tipc msg to be checked
3904 *
3905 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3906 */
3907
3908bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3909{
3910 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3911 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3912 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3913
3914 return (qsize > lim * 90 / 100);
3915}
3916
3917/**
3918 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3919 * only the rcv queue is considered
3920 * @sk: tipc sk to be checked
3921 * @skb: tipc msg to be checked
3922 *
3923 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3924 */
3925
3926bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3927{
3928 unsigned int lim = rcvbuf_limit(sk, skb);
3929 unsigned int qsize = sk_rmem_alloc_get(sk);
3930
3931 return (qsize > lim * 90 / 100);
3932}
3933
3934/**
3935 * tipc_sk_dump - dump TIPC socket
3936 * @sk: tipc sk to be dumped
3937 * @dqueues: bitmask to decide if any socket queue to be dumped?
3938 * - TIPC_DUMP_NONE: don't dump socket queues
3939 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3940 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3941 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3942 * - TIPC_DUMP_ALL: dump all the socket queues above
3943 * @buf: returned buffer of dump data in format
3944 */
3945int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3946{
3947 int i = 0;
3948 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3949 u32 conn_type, conn_instance;
3950 struct tipc_sock *tsk;
3951 struct publication *p;
3952 bool tsk_connected;
3953
3954 if (!sk) {
3955 i += scnprintf(buf, sz, "sk data: (null)\n");
3956 return i;
3957 }
3958
3959 tsk = tipc_sk(sk);
3960 tsk_connected = !tipc_sk_type_connectionless(sk);
3961
3962 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3963 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3964 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3965 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3966 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3967 if (tsk_connected) {
3968 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3969 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3970 conn_type = msg_nametype(&tsk->phdr);
3971 conn_instance = msg_nameinst(&tsk->phdr);
3972 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3973 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3974 }
3975 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3976 if (tsk->published) {
3977 p = list_first_entry_or_null(&tsk->publications,
3978 struct publication, binding_sock);
3979 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3980 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3981 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3982 }
3983 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3984 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3985 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3986 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3987 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3988 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3989 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3990 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3991 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3992 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3993 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3994 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3995 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3996 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3997
3998 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3999 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
4000 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
4001 }
4002
4003 if (dqueues & TIPC_DUMP_SK_RCVQ) {
4004 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
4005 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
4006 }
4007
4008 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
4009 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
4010 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
4011 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
4012 i += scnprintf(buf + i, sz - i, " tail ");
4013 i += tipc_skb_dump(sk->sk_backlog.tail, false,
4014 buf + i);
4015 }
4016 }
4017
4018 return i;
4019}