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