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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, 2012-2019, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
6 * Copyright (c) 2020-2021, Red Hat Inc
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
20 *
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
29 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38#include <linux/rhashtable.h>
39#include <linux/sched/signal.h>
40#include <trace/events/sock.h>
41
42#include "core.h"
43#include "name_table.h"
44#include "node.h"
45#include "link.h"
46#include "name_distr.h"
47#include "socket.h"
48#include "bcast.h"
49#include "netlink.h"
50#include "group.h"
51#include "trace.h"
52
53#define NAGLE_START_INIT 4
54#define NAGLE_START_MAX 1024
55#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
56#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
57#define TIPC_MAX_PORT 0xffffffff
58#define TIPC_MIN_PORT 1
59#define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */
60
61enum {
62 TIPC_LISTEN = TCP_LISTEN,
63 TIPC_ESTABLISHED = TCP_ESTABLISHED,
64 TIPC_OPEN = TCP_CLOSE,
65 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
66 TIPC_CONNECTING = TCP_SYN_SENT,
67};
68
69struct sockaddr_pair {
70 struct sockaddr_tipc sock;
71 struct sockaddr_tipc member;
72};
73
74/**
75 * struct tipc_sock - TIPC socket structure
76 * @sk: socket - interacts with 'port' and with user via the socket API
77 * @max_pkt: maximum packet size "hint" used when building messages sent by port
78 * @maxnagle: maximum size of msg which can be subject to nagle
79 * @portid: unique port identity in TIPC socket hash table
80 * @phdr: preformatted message header used when sending messages
81 * @cong_links: list of congested links
82 * @publications: list of publications for port
83 * @pub_count: total # of publications port has made during its lifetime
84 * @conn_timeout: the time we can wait for an unresponded setup request
85 * @probe_unacked: probe has not received ack yet
86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
87 * @cong_link_cnt: number of congested links
88 * @snt_unacked: # messages sent by socket, and not yet acked by peer
89 * @snd_win: send window size
90 * @peer_caps: peer capabilities mask
91 * @rcv_unacked: # messages read by user, but not yet acked back to peer
92 * @rcv_win: receive window size
93 * @peer: 'connected' peer for dgram/rdm
94 * @node: hash table node
95 * @mc_method: cookie for use between socket and broadcast layer
96 * @rcu: rcu struct for tipc_sock
97 * @group: TIPC communications group
98 * @oneway: message count in one direction (FIXME)
99 * @nagle_start: current nagle value
100 * @snd_backlog: send backlog count
101 * @msg_acc: messages accepted; used in managing backlog and nagle
102 * @pkt_cnt: TIPC socket packet count
103 * @expect_ack: whether this TIPC socket is expecting an ack
104 * @nodelay: setsockopt() TIPC_NODELAY setting
105 * @group_is_open: TIPC socket group is fully open (FIXME)
106 * @published: true if port has one or more associated names
107 * @conn_addrtype: address type used when establishing connection
108 */
109struct tipc_sock {
110 struct sock sk;
111 u32 max_pkt;
112 u32 maxnagle;
113 u32 portid;
114 struct tipc_msg phdr;
115 struct list_head cong_links;
116 struct list_head publications;
117 u32 pub_count;
118 atomic_t dupl_rcvcnt;
119 u16 conn_timeout;
120 bool probe_unacked;
121 u16 cong_link_cnt;
122 u16 snt_unacked;
123 u16 snd_win;
124 u16 peer_caps;
125 u16 rcv_unacked;
126 u16 rcv_win;
127 struct sockaddr_tipc peer;
128 struct rhash_head node;
129 struct tipc_mc_method mc_method;
130 struct rcu_head rcu;
131 struct tipc_group *group;
132 u32 oneway;
133 u32 nagle_start;
134 u16 snd_backlog;
135 u16 msg_acc;
136 u16 pkt_cnt;
137 bool expect_ack;
138 bool nodelay;
139 bool group_is_open;
140 bool published;
141 u8 conn_addrtype;
142};
143
144static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
145static void tipc_data_ready(struct sock *sk);
146static void tipc_write_space(struct sock *sk);
147static void tipc_sock_destruct(struct sock *sk);
148static int tipc_release(struct socket *sock);
149static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
150 bool kern);
151static void tipc_sk_timeout(struct timer_list *t);
152static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
153static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
154static int tipc_sk_leave(struct tipc_sock *tsk);
155static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
156static int tipc_sk_insert(struct tipc_sock *tsk);
157static void tipc_sk_remove(struct tipc_sock *tsk);
158static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
159static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
160static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
161static int tipc_wait_for_connect(struct socket *sock, long *timeo_p);
162
163static const struct proto_ops packet_ops;
164static const struct proto_ops stream_ops;
165static const struct proto_ops msg_ops;
166static struct proto tipc_proto;
167static const struct rhashtable_params tsk_rht_params;
168
169static u32 tsk_own_node(struct tipc_sock *tsk)
170{
171 return msg_prevnode(&tsk->phdr);
172}
173
174static u32 tsk_peer_node(struct tipc_sock *tsk)
175{
176 return msg_destnode(&tsk->phdr);
177}
178
179static u32 tsk_peer_port(struct tipc_sock *tsk)
180{
181 return msg_destport(&tsk->phdr);
182}
183
184static bool tsk_unreliable(struct tipc_sock *tsk)
185{
186 return msg_src_droppable(&tsk->phdr) != 0;
187}
188
189static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
190{
191 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
192}
193
194static bool tsk_unreturnable(struct tipc_sock *tsk)
195{
196 return msg_dest_droppable(&tsk->phdr) != 0;
197}
198
199static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
200{
201 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
202}
203
204static int tsk_importance(struct tipc_sock *tsk)
205{
206 return msg_importance(&tsk->phdr);
207}
208
209static struct tipc_sock *tipc_sk(const struct sock *sk)
210{
211 return container_of(sk, struct tipc_sock, sk);
212}
213
214int tsk_set_importance(struct sock *sk, int imp)
215{
216 if (imp > TIPC_CRITICAL_IMPORTANCE)
217 return -EINVAL;
218 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
219 return 0;
220}
221
222static bool tsk_conn_cong(struct tipc_sock *tsk)
223{
224 return tsk->snt_unacked > tsk->snd_win;
225}
226
227static u16 tsk_blocks(int len)
228{
229 return ((len / FLOWCTL_BLK_SZ) + 1);
230}
231
232/* tsk_blocks(): translate a buffer size in bytes to number of
233 * advertisable blocks, taking into account the ratio truesize(len)/len
234 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
235 */
236static u16 tsk_adv_blocks(int len)
237{
238 return len / FLOWCTL_BLK_SZ / 4;
239}
240
241/* tsk_inc(): increment counter for sent or received data
242 * - If block based flow control is not supported by peer we
243 * fall back to message based ditto, incrementing the counter
244 */
245static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
246{
247 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
248 return ((msglen / FLOWCTL_BLK_SZ) + 1);
249 return 1;
250}
251
252/* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
253 */
254static void tsk_set_nagle(struct tipc_sock *tsk)
255{
256 struct sock *sk = &tsk->sk;
257
258 tsk->maxnagle = 0;
259 if (sk->sk_type != SOCK_STREAM)
260 return;
261 if (tsk->nodelay)
262 return;
263 if (!(tsk->peer_caps & TIPC_NAGLE))
264 return;
265 /* Limit node local buffer size to avoid receive queue overflow */
266 if (tsk->max_pkt == MAX_MSG_SIZE)
267 tsk->maxnagle = 1500;
268 else
269 tsk->maxnagle = tsk->max_pkt;
270}
271
272/**
273 * tsk_advance_rx_queue - discard first buffer in socket receive queue
274 * @sk: network socket
275 *
276 * Caller must hold socket lock
277 */
278static void tsk_advance_rx_queue(struct sock *sk)
279{
280 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
281 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
282}
283
284/* tipc_sk_respond() : send response message back to sender
285 */
286static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
287{
288 u32 selector;
289 u32 dnode;
290 u32 onode = tipc_own_addr(sock_net(sk));
291
292 if (!tipc_msg_reverse(onode, &skb, err))
293 return;
294
295 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
296 dnode = msg_destnode(buf_msg(skb));
297 selector = msg_origport(buf_msg(skb));
298 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
299}
300
301/**
302 * tsk_rej_rx_queue - reject all buffers in socket receive queue
303 * @sk: network socket
304 * @error: response error code
305 *
306 * Caller must hold socket lock
307 */
308static void tsk_rej_rx_queue(struct sock *sk, int error)
309{
310 struct sk_buff *skb;
311
312 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
313 tipc_sk_respond(sk, skb, error);
314}
315
316static bool tipc_sk_connected(const struct sock *sk)
317{
318 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED;
319}
320
321/* tipc_sk_type_connectionless - check if the socket is datagram socket
322 * @sk: socket
323 *
324 * Returns true if connection less, false otherwise
325 */
326static bool tipc_sk_type_connectionless(struct sock *sk)
327{
328 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
329}
330
331/* tsk_peer_msg - verify if message was sent by connected port's peer
332 *
333 * Handles cases where the node's network address has changed from
334 * the default of <0.0.0> to its configured setting.
335 */
336static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
337{
338 struct sock *sk = &tsk->sk;
339 u32 self = tipc_own_addr(sock_net(sk));
340 u32 peer_port = tsk_peer_port(tsk);
341 u32 orig_node, peer_node;
342
343 if (unlikely(!tipc_sk_connected(sk)))
344 return false;
345
346 if (unlikely(msg_origport(msg) != peer_port))
347 return false;
348
349 orig_node = msg_orignode(msg);
350 peer_node = tsk_peer_node(tsk);
351
352 if (likely(orig_node == peer_node))
353 return true;
354
355 if (!orig_node && peer_node == self)
356 return true;
357
358 if (!peer_node && orig_node == self)
359 return true;
360
361 return false;
362}
363
364/* tipc_set_sk_state - set the sk_state of the socket
365 * @sk: socket
366 *
367 * Caller must hold socket lock
368 *
369 * Returns 0 on success, errno otherwise
370 */
371static int tipc_set_sk_state(struct sock *sk, int state)
372{
373 int oldsk_state = sk->sk_state;
374 int res = -EINVAL;
375
376 switch (state) {
377 case TIPC_OPEN:
378 res = 0;
379 break;
380 case TIPC_LISTEN:
381 case TIPC_CONNECTING:
382 if (oldsk_state == TIPC_OPEN)
383 res = 0;
384 break;
385 case TIPC_ESTABLISHED:
386 if (oldsk_state == TIPC_CONNECTING ||
387 oldsk_state == TIPC_OPEN)
388 res = 0;
389 break;
390 case TIPC_DISCONNECTING:
391 if (oldsk_state == TIPC_CONNECTING ||
392 oldsk_state == TIPC_ESTABLISHED)
393 res = 0;
394 break;
395 }
396
397 if (!res)
398 sk->sk_state = state;
399
400 return res;
401}
402
403static int tipc_sk_sock_err(struct socket *sock, long *timeout)
404{
405 struct sock *sk = sock->sk;
406 int err = sock_error(sk);
407 int typ = sock->type;
408
409 if (err)
410 return err;
411 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
412 if (sk->sk_state == TIPC_DISCONNECTING)
413 return -EPIPE;
414 else if (!tipc_sk_connected(sk))
415 return -ENOTCONN;
416 }
417 if (!*timeout)
418 return -EAGAIN;
419 if (signal_pending(current))
420 return sock_intr_errno(*timeout);
421
422 return 0;
423}
424
425#define tipc_wait_for_cond(sock_, timeo_, condition_) \
426({ \
427 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
428 struct sock *sk_; \
429 int rc_; \
430 \
431 while ((rc_ = !(condition_))) { \
432 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
433 smp_rmb(); \
434 sk_ = (sock_)->sk; \
435 rc_ = tipc_sk_sock_err((sock_), timeo_); \
436 if (rc_) \
437 break; \
438 add_wait_queue(sk_sleep(sk_), &wait_); \
439 release_sock(sk_); \
440 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
441 sched_annotate_sleep(); \
442 lock_sock(sk_); \
443 remove_wait_queue(sk_sleep(sk_), &wait_); \
444 } \
445 rc_; \
446})
447
448/**
449 * tipc_sk_create - create a TIPC socket
450 * @net: network namespace (must be default network)
451 * @sock: pre-allocated socket structure
452 * @protocol: protocol indicator (must be 0)
453 * @kern: caused by kernel or by userspace?
454 *
455 * This routine creates additional data structures used by the TIPC socket,
456 * initializes them, and links them together.
457 *
458 * Return: 0 on success, errno otherwise
459 */
460static int tipc_sk_create(struct net *net, struct socket *sock,
461 int protocol, int kern)
462{
463 const struct proto_ops *ops;
464 struct sock *sk;
465 struct tipc_sock *tsk;
466 struct tipc_msg *msg;
467
468 /* Validate arguments */
469 if (unlikely(protocol != 0))
470 return -EPROTONOSUPPORT;
471
472 switch (sock->type) {
473 case SOCK_STREAM:
474 ops = &stream_ops;
475 break;
476 case SOCK_SEQPACKET:
477 ops = &packet_ops;
478 break;
479 case SOCK_DGRAM:
480 case SOCK_RDM:
481 ops = &msg_ops;
482 break;
483 default:
484 return -EPROTOTYPE;
485 }
486
487 /* Allocate socket's protocol area */
488 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
489 if (sk == NULL)
490 return -ENOMEM;
491
492 tsk = tipc_sk(sk);
493 tsk->max_pkt = MAX_PKT_DEFAULT;
494 tsk->maxnagle = 0;
495 tsk->nagle_start = NAGLE_START_INIT;
496 INIT_LIST_HEAD(&tsk->publications);
497 INIT_LIST_HEAD(&tsk->cong_links);
498 msg = &tsk->phdr;
499
500 /* Finish initializing socket data structures */
501 sock->ops = ops;
502 sock_init_data(sock, sk);
503 tipc_set_sk_state(sk, TIPC_OPEN);
504 if (tipc_sk_insert(tsk)) {
505 sk_free(sk);
506 pr_warn("Socket create failed; port number exhausted\n");
507 return -EINVAL;
508 }
509
510 /* Ensure tsk is visible before we read own_addr. */
511 smp_mb();
512
513 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
514 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
515
516 msg_set_origport(msg, tsk->portid);
517 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
518 sk->sk_shutdown = 0;
519 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
520 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]);
521 sk->sk_data_ready = tipc_data_ready;
522 sk->sk_write_space = tipc_write_space;
523 sk->sk_destruct = tipc_sock_destruct;
524 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
525 tsk->group_is_open = true;
526 atomic_set(&tsk->dupl_rcvcnt, 0);
527
528 /* Start out with safe limits until we receive an advertised window */
529 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
530 tsk->rcv_win = tsk->snd_win;
531
532 if (tipc_sk_type_connectionless(sk)) {
533 tsk_set_unreturnable(tsk, true);
534 if (sock->type == SOCK_DGRAM)
535 tsk_set_unreliable(tsk, true);
536 }
537 __skb_queue_head_init(&tsk->mc_method.deferredq);
538 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
539 return 0;
540}
541
542static void tipc_sk_callback(struct rcu_head *head)
543{
544 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
545
546 sock_put(&tsk->sk);
547}
548
549/* Caller should hold socket lock for the socket. */
550static void __tipc_shutdown(struct socket *sock, int error)
551{
552 struct sock *sk = sock->sk;
553 struct tipc_sock *tsk = tipc_sk(sk);
554 struct net *net = sock_net(sk);
555 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
556 u32 dnode = tsk_peer_node(tsk);
557 struct sk_buff *skb;
558
559 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
560 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
561 !tsk_conn_cong(tsk)));
562
563 /* Push out delayed messages if in Nagle mode */
564 tipc_sk_push_backlog(tsk, false);
565 /* Remove pending SYN */
566 __skb_queue_purge(&sk->sk_write_queue);
567
568 /* Remove partially received buffer if any */
569 skb = skb_peek(&sk->sk_receive_queue);
570 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
571 __skb_unlink(skb, &sk->sk_receive_queue);
572 kfree_skb(skb);
573 }
574
575 /* Reject all unreceived messages if connectionless */
576 if (tipc_sk_type_connectionless(sk)) {
577 tsk_rej_rx_queue(sk, error);
578 return;
579 }
580
581 switch (sk->sk_state) {
582 case TIPC_CONNECTING:
583 case TIPC_ESTABLISHED:
584 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
585 tipc_node_remove_conn(net, dnode, tsk->portid);
586 /* Send a FIN+/- to its peer */
587 skb = __skb_dequeue(&sk->sk_receive_queue);
588 if (skb) {
589 __skb_queue_purge(&sk->sk_receive_queue);
590 tipc_sk_respond(sk, skb, error);
591 break;
592 }
593 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
594 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
595 tsk_own_node(tsk), tsk_peer_port(tsk),
596 tsk->portid, error);
597 if (skb)
598 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
599 break;
600 case TIPC_LISTEN:
601 /* Reject all SYN messages */
602 tsk_rej_rx_queue(sk, error);
603 break;
604 default:
605 __skb_queue_purge(&sk->sk_receive_queue);
606 break;
607 }
608}
609
610/**
611 * tipc_release - destroy a TIPC socket
612 * @sock: socket to destroy
613 *
614 * This routine cleans up any messages that are still queued on the socket.
615 * For DGRAM and RDM socket types, all queued messages are rejected.
616 * For SEQPACKET and STREAM socket types, the first message is rejected
617 * and any others are discarded. (If the first message on a STREAM socket
618 * is partially-read, it is discarded and the next one is rejected instead.)
619 *
620 * NOTE: Rejected messages are not necessarily returned to the sender! They
621 * are returned or discarded according to the "destination droppable" setting
622 * specified for the message by the sender.
623 *
624 * Return: 0 on success, errno otherwise
625 */
626static int tipc_release(struct socket *sock)
627{
628 struct sock *sk = sock->sk;
629 struct tipc_sock *tsk;
630
631 /*
632 * Exit if socket isn't fully initialized (occurs when a failed accept()
633 * releases a pre-allocated child socket that was never used)
634 */
635 if (sk == NULL)
636 return 0;
637
638 tsk = tipc_sk(sk);
639 lock_sock(sk);
640
641 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
642 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
643 sk->sk_shutdown = SHUTDOWN_MASK;
644 tipc_sk_leave(tsk);
645 tipc_sk_withdraw(tsk, NULL);
646 __skb_queue_purge(&tsk->mc_method.deferredq);
647 sk_stop_timer(sk, &sk->sk_timer);
648 tipc_sk_remove(tsk);
649
650 sock_orphan(sk);
651 /* Reject any messages that accumulated in backlog queue */
652 release_sock(sk);
653 tipc_dest_list_purge(&tsk->cong_links);
654 tsk->cong_link_cnt = 0;
655 call_rcu(&tsk->rcu, tipc_sk_callback);
656 sock->sk = NULL;
657
658 return 0;
659}
660
661/**
662 * __tipc_bind - associate or disassocate TIPC name(s) with a socket
663 * @sock: socket structure
664 * @skaddr: socket address describing name(s) and desired operation
665 * @alen: size of socket address data structure
666 *
667 * Name and name sequence binding are indicated using a positive scope value;
668 * a negative scope value unbinds the specified name. Specifying no name
669 * (i.e. a socket address length of 0) unbinds all names from the socket.
670 *
671 * Return: 0 on success, errno otherwise
672 *
673 * NOTE: This routine doesn't need to take the socket lock since it doesn't
674 * access any non-constant socket information.
675 */
676static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
677{
678 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
679 struct tipc_sock *tsk = tipc_sk(sock->sk);
680 bool unbind = false;
681
682 if (unlikely(!alen))
683 return tipc_sk_withdraw(tsk, NULL);
684
685 if (ua->addrtype == TIPC_SERVICE_ADDR) {
686 ua->addrtype = TIPC_SERVICE_RANGE;
687 ua->sr.upper = ua->sr.lower;
688 }
689 if (ua->scope < 0) {
690 unbind = true;
691 ua->scope = -ua->scope;
692 }
693 /* Users may still use deprecated TIPC_ZONE_SCOPE */
694 if (ua->scope != TIPC_NODE_SCOPE)
695 ua->scope = TIPC_CLUSTER_SCOPE;
696
697 if (tsk->group)
698 return -EACCES;
699
700 if (unbind)
701 return tipc_sk_withdraw(tsk, ua);
702 return tipc_sk_publish(tsk, ua);
703}
704
705int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
706{
707 int res;
708
709 lock_sock(sock->sk);
710 res = __tipc_bind(sock, skaddr, alen);
711 release_sock(sock->sk);
712 return res;
713}
714
715static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
716{
717 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
718 u32 atype = ua->addrtype;
719
720 if (alen) {
721 if (!tipc_uaddr_valid(ua, alen))
722 return -EINVAL;
723 if (atype == TIPC_SOCKET_ADDR)
724 return -EAFNOSUPPORT;
725 if (ua->sr.type < TIPC_RESERVED_TYPES) {
726 pr_warn_once("Can't bind to reserved service type %u\n",
727 ua->sr.type);
728 return -EACCES;
729 }
730 }
731 return tipc_sk_bind(sock, skaddr, alen);
732}
733
734/**
735 * tipc_getname - get port ID of socket or peer socket
736 * @sock: socket structure
737 * @uaddr: area for returned socket address
738 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
739 *
740 * Return: 0 on success, errno otherwise
741 *
742 * NOTE: This routine doesn't need to take the socket lock since it only
743 * accesses socket information that is unchanging (or which changes in
744 * a completely predictable manner).
745 */
746static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
747 int peer)
748{
749 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
750 struct sock *sk = sock->sk;
751 struct tipc_sock *tsk = tipc_sk(sk);
752
753 memset(addr, 0, sizeof(*addr));
754 if (peer) {
755 if ((!tipc_sk_connected(sk)) &&
756 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
757 return -ENOTCONN;
758 addr->addr.id.ref = tsk_peer_port(tsk);
759 addr->addr.id.node = tsk_peer_node(tsk);
760 } else {
761 addr->addr.id.ref = tsk->portid;
762 addr->addr.id.node = tipc_own_addr(sock_net(sk));
763 }
764
765 addr->addrtype = TIPC_SOCKET_ADDR;
766 addr->family = AF_TIPC;
767 addr->scope = 0;
768 addr->addr.name.domain = 0;
769
770 return sizeof(*addr);
771}
772
773/**
774 * tipc_poll - read and possibly block on pollmask
775 * @file: file structure associated with the socket
776 * @sock: socket for which to calculate the poll bits
777 * @wait: ???
778 *
779 * Return: pollmask value
780 *
781 * COMMENTARY:
782 * It appears that the usual socket locking mechanisms are not useful here
783 * since the pollmask info is potentially out-of-date the moment this routine
784 * exits. TCP and other protocols seem to rely on higher level poll routines
785 * to handle any preventable race conditions, so TIPC will do the same ...
786 *
787 * IMPORTANT: The fact that a read or write operation is indicated does NOT
788 * imply that the operation will succeed, merely that it should be performed
789 * and will not block.
790 */
791static __poll_t tipc_poll(struct file *file, struct socket *sock,
792 poll_table *wait)
793{
794 struct sock *sk = sock->sk;
795 struct tipc_sock *tsk = tipc_sk(sk);
796 __poll_t revents = 0;
797
798 sock_poll_wait(file, sock, wait);
799 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
800
801 if (sk->sk_shutdown & RCV_SHUTDOWN)
802 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
803 if (sk->sk_shutdown == SHUTDOWN_MASK)
804 revents |= EPOLLHUP;
805
806 switch (sk->sk_state) {
807 case TIPC_ESTABLISHED:
808 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
809 revents |= EPOLLOUT;
810 fallthrough;
811 case TIPC_LISTEN:
812 case TIPC_CONNECTING:
813 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
814 revents |= EPOLLIN | EPOLLRDNORM;
815 break;
816 case TIPC_OPEN:
817 if (tsk->group_is_open && !tsk->cong_link_cnt)
818 revents |= EPOLLOUT;
819 if (!tipc_sk_type_connectionless(sk))
820 break;
821 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
822 break;
823 revents |= EPOLLIN | EPOLLRDNORM;
824 break;
825 case TIPC_DISCONNECTING:
826 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
827 break;
828 }
829 return revents;
830}
831
832/**
833 * tipc_sendmcast - send multicast message
834 * @sock: socket structure
835 * @ua: destination address struct
836 * @msg: message to send
837 * @dlen: length of data to send
838 * @timeout: timeout to wait for wakeup
839 *
840 * Called from function tipc_sendmsg(), which has done all sanity checks
841 * Return: the number of bytes sent on success, or errno
842 */
843static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua,
844 struct msghdr *msg, size_t dlen, long timeout)
845{
846 struct sock *sk = sock->sk;
847 struct tipc_sock *tsk = tipc_sk(sk);
848 struct tipc_msg *hdr = &tsk->phdr;
849 struct net *net = sock_net(sk);
850 int mtu = tipc_bcast_get_mtu(net);
851 struct sk_buff_head pkts;
852 struct tipc_nlist dsts;
853 int rc;
854
855 if (tsk->group)
856 return -EACCES;
857
858 /* Block or return if any destination link is congested */
859 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
860 if (unlikely(rc))
861 return rc;
862
863 /* Lookup destination nodes */
864 tipc_nlist_init(&dsts, tipc_own_addr(net));
865 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts);
866 if (!dsts.local && !dsts.remote)
867 return -EHOSTUNREACH;
868
869 /* Build message header */
870 msg_set_type(hdr, TIPC_MCAST_MSG);
871 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
872 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
873 msg_set_destport(hdr, 0);
874 msg_set_destnode(hdr, 0);
875 msg_set_nametype(hdr, ua->sr.type);
876 msg_set_namelower(hdr, ua->sr.lower);
877 msg_set_nameupper(hdr, ua->sr.upper);
878
879 /* Build message as chain of buffers */
880 __skb_queue_head_init(&pkts);
881 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
882
883 /* Send message if build was successful */
884 if (unlikely(rc == dlen)) {
885 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
886 TIPC_DUMP_SK_SNDQ, " ");
887 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts,
888 &tsk->cong_link_cnt);
889 }
890
891 tipc_nlist_purge(&dsts);
892
893 return rc ? rc : dlen;
894}
895
896/**
897 * tipc_send_group_msg - send a message to a member in the group
898 * @net: network namespace
899 * @tsk: tipc socket
900 * @m: message to send
901 * @mb: group member
902 * @dnode: destination node
903 * @dport: destination port
904 * @dlen: total length of message data
905 */
906static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
907 struct msghdr *m, struct tipc_member *mb,
908 u32 dnode, u32 dport, int dlen)
909{
910 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
911 struct tipc_mc_method *method = &tsk->mc_method;
912 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
913 struct tipc_msg *hdr = &tsk->phdr;
914 struct sk_buff_head pkts;
915 int mtu, rc;
916
917 /* Complete message header */
918 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
919 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
920 msg_set_destport(hdr, dport);
921 msg_set_destnode(hdr, dnode);
922 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
923
924 /* Build message as chain of buffers */
925 __skb_queue_head_init(&pkts);
926 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
927 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
928 if (unlikely(rc != dlen))
929 return rc;
930
931 /* Send message */
932 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
933 if (unlikely(rc == -ELINKCONG)) {
934 tipc_dest_push(&tsk->cong_links, dnode, 0);
935 tsk->cong_link_cnt++;
936 }
937
938 /* Update send window */
939 tipc_group_update_member(mb, blks);
940
941 /* A broadcast sent within next EXPIRE period must follow same path */
942 method->rcast = true;
943 method->mandatory = true;
944 return dlen;
945}
946
947/**
948 * tipc_send_group_unicast - send message to a member in the group
949 * @sock: socket structure
950 * @m: message to send
951 * @dlen: total length of message data
952 * @timeout: timeout to wait for wakeup
953 *
954 * Called from function tipc_sendmsg(), which has done all sanity checks
955 * Return: the number of bytes sent on success, or errno
956 */
957static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
958 int dlen, long timeout)
959{
960 struct sock *sk = sock->sk;
961 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
962 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
963 struct tipc_sock *tsk = tipc_sk(sk);
964 struct net *net = sock_net(sk);
965 struct tipc_member *mb = NULL;
966 u32 node, port;
967 int rc;
968
969 node = ua->sk.node;
970 port = ua->sk.ref;
971 if (!port && !node)
972 return -EHOSTUNREACH;
973
974 /* Block or return if destination link or member is congested */
975 rc = tipc_wait_for_cond(sock, &timeout,
976 !tipc_dest_find(&tsk->cong_links, node, 0) &&
977 tsk->group &&
978 !tipc_group_cong(tsk->group, node, port, blks,
979 &mb));
980 if (unlikely(rc))
981 return rc;
982
983 if (unlikely(!mb))
984 return -EHOSTUNREACH;
985
986 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
987
988 return rc ? rc : dlen;
989}
990
991/**
992 * tipc_send_group_anycast - send message to any member with given identity
993 * @sock: 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 * Return: the number of bytes sent on success, or errno
1000 */
1001static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
1002 int dlen, long timeout)
1003{
1004 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1005 struct sock *sk = sock->sk;
1006 struct tipc_sock *tsk = tipc_sk(sk);
1007 struct list_head *cong_links = &tsk->cong_links;
1008 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
1009 struct tipc_msg *hdr = &tsk->phdr;
1010 struct tipc_member *first = NULL;
1011 struct tipc_member *mbr = NULL;
1012 struct net *net = sock_net(sk);
1013 u32 node, port, exclude;
1014 struct list_head dsts;
1015 int lookups = 0;
1016 int dstcnt, rc;
1017 bool cong;
1018
1019 INIT_LIST_HEAD(&dsts);
1020 ua->sa.type = msg_nametype(hdr);
1021 ua->scope = msg_lookup_scope(hdr);
1022
1023 while (++lookups < 4) {
1024 exclude = tipc_group_exclude(tsk->group);
1025
1026 first = NULL;
1027
1028 /* Look for a non-congested destination member, if any */
1029 while (1) {
1030 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1031 exclude, false))
1032 return -EHOSTUNREACH;
1033 tipc_dest_pop(&dsts, &node, &port);
1034 cong = tipc_group_cong(tsk->group, node, port, blks,
1035 &mbr);
1036 if (!cong)
1037 break;
1038 if (mbr == first)
1039 break;
1040 if (!first)
1041 first = mbr;
1042 }
1043
1044 /* Start over if destination was not in member list */
1045 if (unlikely(!mbr))
1046 continue;
1047
1048 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1049 break;
1050
1051 /* Block or return if destination link or member is congested */
1052 rc = tipc_wait_for_cond(sock, &timeout,
1053 !tipc_dest_find(cong_links, node, 0) &&
1054 tsk->group &&
1055 !tipc_group_cong(tsk->group, node, port,
1056 blks, &mbr));
1057 if (unlikely(rc))
1058 return rc;
1059
1060 /* Send, unless destination disappeared while waiting */
1061 if (likely(mbr))
1062 break;
1063 }
1064
1065 if (unlikely(lookups >= 4))
1066 return -EHOSTUNREACH;
1067
1068 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1069
1070 return rc ? rc : dlen;
1071}
1072
1073/**
1074 * tipc_send_group_bcast - send message to all members in communication group
1075 * @sock: socket structure
1076 * @m: message to send
1077 * @dlen: total length of message data
1078 * @timeout: timeout to wait for wakeup
1079 *
1080 * Called from function tipc_sendmsg(), which has done all sanity checks
1081 * Return: the number of bytes sent on success, or errno
1082 */
1083static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1084 int dlen, long timeout)
1085{
1086 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1087 struct sock *sk = sock->sk;
1088 struct net *net = sock_net(sk);
1089 struct tipc_sock *tsk = tipc_sk(sk);
1090 struct tipc_nlist *dsts;
1091 struct tipc_mc_method *method = &tsk->mc_method;
1092 bool ack = method->mandatory && method->rcast;
1093 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1094 struct tipc_msg *hdr = &tsk->phdr;
1095 int mtu = tipc_bcast_get_mtu(net);
1096 struct sk_buff_head pkts;
1097 int rc = -EHOSTUNREACH;
1098
1099 /* Block or return if any destination link or member is congested */
1100 rc = tipc_wait_for_cond(sock, &timeout,
1101 !tsk->cong_link_cnt && tsk->group &&
1102 !tipc_group_bc_cong(tsk->group, blks));
1103 if (unlikely(rc))
1104 return rc;
1105
1106 dsts = tipc_group_dests(tsk->group);
1107 if (!dsts->local && !dsts->remote)
1108 return -EHOSTUNREACH;
1109
1110 /* Complete message header */
1111 if (ua) {
1112 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1113 msg_set_nameinst(hdr, ua->sa.instance);
1114 } else {
1115 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1116 msg_set_nameinst(hdr, 0);
1117 }
1118 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1119 msg_set_destport(hdr, 0);
1120 msg_set_destnode(hdr, 0);
1121 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1122
1123 /* Avoid getting stuck with repeated forced replicasts */
1124 msg_set_grp_bc_ack_req(hdr, ack);
1125
1126 /* Build message as chain of buffers */
1127 __skb_queue_head_init(&pkts);
1128 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1129 if (unlikely(rc != dlen))
1130 return rc;
1131
1132 /* Send message */
1133 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1134 if (unlikely(rc))
1135 return rc;
1136
1137 /* Update broadcast sequence number and send windows */
1138 tipc_group_update_bc_members(tsk->group, blks, ack);
1139
1140 /* Broadcast link is now free to choose method for next broadcast */
1141 method->mandatory = false;
1142 method->expires = jiffies;
1143
1144 return dlen;
1145}
1146
1147/**
1148 * tipc_send_group_mcast - send message to all members with given identity
1149 * @sock: socket structure
1150 * @m: message to send
1151 * @dlen: total length of message data
1152 * @timeout: timeout to wait for wakeup
1153 *
1154 * Called from function tipc_sendmsg(), which has done all sanity checks
1155 * Return: the number of bytes sent on success, or errno
1156 */
1157static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1158 int dlen, long timeout)
1159{
1160 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1161 struct sock *sk = sock->sk;
1162 struct tipc_sock *tsk = tipc_sk(sk);
1163 struct tipc_group *grp = tsk->group;
1164 struct tipc_msg *hdr = &tsk->phdr;
1165 struct net *net = sock_net(sk);
1166 struct list_head dsts;
1167 u32 dstcnt, exclude;
1168
1169 INIT_LIST_HEAD(&dsts);
1170 ua->sa.type = msg_nametype(hdr);
1171 ua->scope = msg_lookup_scope(hdr);
1172 exclude = tipc_group_exclude(grp);
1173
1174 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1175 return -EHOSTUNREACH;
1176
1177 if (dstcnt == 1) {
1178 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1179 return tipc_send_group_unicast(sock, m, dlen, timeout);
1180 }
1181
1182 tipc_dest_list_purge(&dsts);
1183 return tipc_send_group_bcast(sock, m, dlen, timeout);
1184}
1185
1186/**
1187 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1188 * @net: the associated network namespace
1189 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1190 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1191 *
1192 * Multi-threaded: parallel calls with reference to same queues may occur
1193 */
1194void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1195 struct sk_buff_head *inputq)
1196{
1197 u32 self = tipc_own_addr(net);
1198 struct sk_buff *skb, *_skb;
1199 u32 portid, onode;
1200 struct sk_buff_head tmpq;
1201 struct list_head dports;
1202 struct tipc_msg *hdr;
1203 struct tipc_uaddr ua;
1204 int user, mtyp, hlen;
1205
1206 __skb_queue_head_init(&tmpq);
1207 INIT_LIST_HEAD(&dports);
1208 ua.addrtype = TIPC_SERVICE_RANGE;
1209
1210 /* tipc_skb_peek() increments the head skb's reference counter */
1211 skb = tipc_skb_peek(arrvq, &inputq->lock);
1212 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1213 hdr = buf_msg(skb);
1214 user = msg_user(hdr);
1215 mtyp = msg_type(hdr);
1216 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1217 onode = msg_orignode(hdr);
1218 ua.sr.type = msg_nametype(hdr);
1219 ua.sr.lower = msg_namelower(hdr);
1220 ua.sr.upper = msg_nameupper(hdr);
1221 if (onode == self)
1222 ua.scope = TIPC_ANY_SCOPE;
1223 else
1224 ua.scope = TIPC_CLUSTER_SCOPE;
1225
1226 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1227 spin_lock_bh(&inputq->lock);
1228 if (skb_peek(arrvq) == skb) {
1229 __skb_dequeue(arrvq);
1230 __skb_queue_tail(inputq, skb);
1231 }
1232 kfree_skb(skb);
1233 spin_unlock_bh(&inputq->lock);
1234 continue;
1235 }
1236
1237 /* Group messages require exact scope match */
1238 if (msg_in_group(hdr)) {
1239 ua.sr.lower = 0;
1240 ua.sr.upper = ~0;
1241 ua.scope = msg_lookup_scope(hdr);
1242 }
1243
1244 /* Create destination port list: */
1245 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1246
1247 /* Clone message per destination */
1248 while (tipc_dest_pop(&dports, NULL, &portid)) {
1249 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1250 if (_skb) {
1251 msg_set_destport(buf_msg(_skb), portid);
1252 __skb_queue_tail(&tmpq, _skb);
1253 continue;
1254 }
1255 pr_warn("Failed to clone mcast rcv buffer\n");
1256 }
1257 /* Append clones to inputq only if skb is still head of arrvq */
1258 spin_lock_bh(&inputq->lock);
1259 if (skb_peek(arrvq) == skb) {
1260 skb_queue_splice_tail_init(&tmpq, inputq);
1261 /* Decrement the skb's refcnt */
1262 kfree_skb(__skb_dequeue(arrvq));
1263 }
1264 spin_unlock_bh(&inputq->lock);
1265 __skb_queue_purge(&tmpq);
1266 kfree_skb(skb);
1267 }
1268 tipc_sk_rcv(net, inputq);
1269}
1270
1271/* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1272 * when socket is in Nagle mode
1273 */
1274static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1275{
1276 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1277 struct sk_buff *skb = skb_peek_tail(txq);
1278 struct net *net = sock_net(&tsk->sk);
1279 u32 dnode = tsk_peer_node(tsk);
1280 int rc;
1281
1282 if (nagle_ack) {
1283 tsk->pkt_cnt += skb_queue_len(txq);
1284 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1285 tsk->oneway = 0;
1286 if (tsk->nagle_start < NAGLE_START_MAX)
1287 tsk->nagle_start *= 2;
1288 tsk->expect_ack = false;
1289 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1290 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1291 tsk->nagle_start);
1292 } else {
1293 tsk->nagle_start = NAGLE_START_INIT;
1294 if (skb) {
1295 msg_set_ack_required(buf_msg(skb));
1296 tsk->expect_ack = true;
1297 } else {
1298 tsk->expect_ack = false;
1299 }
1300 }
1301 tsk->msg_acc = 0;
1302 tsk->pkt_cnt = 0;
1303 }
1304
1305 if (!skb || tsk->cong_link_cnt)
1306 return;
1307
1308 /* Do not send SYN again after congestion */
1309 if (msg_is_syn(buf_msg(skb)))
1310 return;
1311
1312 if (tsk->msg_acc)
1313 tsk->pkt_cnt += skb_queue_len(txq);
1314 tsk->snt_unacked += tsk->snd_backlog;
1315 tsk->snd_backlog = 0;
1316 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1317 if (rc == -ELINKCONG)
1318 tsk->cong_link_cnt = 1;
1319}
1320
1321/**
1322 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1323 * @tsk: receiving socket
1324 * @skb: pointer to message buffer.
1325 * @inputq: buffer list containing the buffers
1326 * @xmitq: output message area
1327 */
1328static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1329 struct sk_buff_head *inputq,
1330 struct sk_buff_head *xmitq)
1331{
1332 struct tipc_msg *hdr = buf_msg(skb);
1333 u32 onode = tsk_own_node(tsk);
1334 struct sock *sk = &tsk->sk;
1335 int mtyp = msg_type(hdr);
1336 bool was_cong;
1337
1338 /* Ignore if connection cannot be validated: */
1339 if (!tsk_peer_msg(tsk, hdr)) {
1340 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1341 goto exit;
1342 }
1343
1344 if (unlikely(msg_errcode(hdr))) {
1345 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1346 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1347 tsk_peer_port(tsk));
1348 sk->sk_state_change(sk);
1349
1350 /* State change is ignored if socket already awake,
1351 * - convert msg to abort msg and add to inqueue
1352 */
1353 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1354 msg_set_type(hdr, TIPC_CONN_MSG);
1355 msg_set_size(hdr, BASIC_H_SIZE);
1356 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1357 __skb_queue_tail(inputq, skb);
1358 return;
1359 }
1360
1361 tsk->probe_unacked = false;
1362
1363 if (mtyp == CONN_PROBE) {
1364 msg_set_type(hdr, CONN_PROBE_REPLY);
1365 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1366 __skb_queue_tail(xmitq, skb);
1367 return;
1368 } else if (mtyp == CONN_ACK) {
1369 was_cong = tsk_conn_cong(tsk);
1370 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1371 tsk->snt_unacked -= msg_conn_ack(hdr);
1372 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1373 tsk->snd_win = msg_adv_win(hdr);
1374 if (was_cong && !tsk_conn_cong(tsk))
1375 sk->sk_write_space(sk);
1376 } else if (mtyp != CONN_PROBE_REPLY) {
1377 pr_warn("Received unknown CONN_PROTO msg\n");
1378 }
1379exit:
1380 kfree_skb(skb);
1381}
1382
1383/**
1384 * tipc_sendmsg - send message in connectionless manner
1385 * @sock: socket structure
1386 * @m: message to send
1387 * @dsz: amount of user data to be sent
1388 *
1389 * Message must have an destination specified explicitly.
1390 * Used for SOCK_RDM and SOCK_DGRAM messages,
1391 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1392 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1393 *
1394 * Return: the number of bytes sent on success, or errno otherwise
1395 */
1396static int tipc_sendmsg(struct socket *sock,
1397 struct msghdr *m, size_t dsz)
1398{
1399 struct sock *sk = sock->sk;
1400 int ret;
1401
1402 lock_sock(sk);
1403 ret = __tipc_sendmsg(sock, m, dsz);
1404 release_sock(sk);
1405
1406 return ret;
1407}
1408
1409static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1410{
1411 struct sock *sk = sock->sk;
1412 struct net *net = sock_net(sk);
1413 struct tipc_sock *tsk = tipc_sk(sk);
1414 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1415 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1416 struct list_head *clinks = &tsk->cong_links;
1417 bool syn = !tipc_sk_type_connectionless(sk);
1418 struct tipc_group *grp = tsk->group;
1419 struct tipc_msg *hdr = &tsk->phdr;
1420 struct tipc_socket_addr skaddr;
1421 struct sk_buff_head pkts;
1422 int atype, mtu, rc;
1423
1424 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1425 return -EMSGSIZE;
1426
1427 if (ua) {
1428 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1429 return -EINVAL;
1430 atype = ua->addrtype;
1431 }
1432
1433 /* If socket belongs to a communication group follow other paths */
1434 if (grp) {
1435 if (!ua)
1436 return tipc_send_group_bcast(sock, m, dlen, timeout);
1437 if (atype == TIPC_SERVICE_ADDR)
1438 return tipc_send_group_anycast(sock, m, dlen, timeout);
1439 if (atype == TIPC_SOCKET_ADDR)
1440 return tipc_send_group_unicast(sock, m, dlen, timeout);
1441 if (atype == TIPC_SERVICE_RANGE)
1442 return tipc_send_group_mcast(sock, m, dlen, timeout);
1443 return -EINVAL;
1444 }
1445
1446 if (!ua) {
1447 ua = (struct tipc_uaddr *)&tsk->peer;
1448 if (!syn && ua->family != AF_TIPC)
1449 return -EDESTADDRREQ;
1450 atype = ua->addrtype;
1451 }
1452
1453 if (unlikely(syn)) {
1454 if (sk->sk_state == TIPC_LISTEN)
1455 return -EPIPE;
1456 if (sk->sk_state != TIPC_OPEN)
1457 return -EISCONN;
1458 if (tsk->published)
1459 return -EOPNOTSUPP;
1460 if (atype == TIPC_SERVICE_ADDR)
1461 tsk->conn_addrtype = atype;
1462 msg_set_syn(hdr, 1);
1463 }
1464
1465 memset(&skaddr, 0, sizeof(skaddr));
1466
1467 /* Determine destination */
1468 if (atype == TIPC_SERVICE_RANGE) {
1469 return tipc_sendmcast(sock, ua, m, dlen, timeout);
1470 } else if (atype == TIPC_SERVICE_ADDR) {
1471 skaddr.node = ua->lookup_node;
1472 ua->scope = tipc_node2scope(skaddr.node);
1473 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr))
1474 return -EHOSTUNREACH;
1475 } else if (atype == TIPC_SOCKET_ADDR) {
1476 skaddr = ua->sk;
1477 } else {
1478 return -EINVAL;
1479 }
1480
1481 /* Block or return if destination link is congested */
1482 rc = tipc_wait_for_cond(sock, &timeout,
1483 !tipc_dest_find(clinks, skaddr.node, 0));
1484 if (unlikely(rc))
1485 return rc;
1486
1487 /* Finally build message header */
1488 msg_set_destnode(hdr, skaddr.node);
1489 msg_set_destport(hdr, skaddr.ref);
1490 if (atype == TIPC_SERVICE_ADDR) {
1491 msg_set_type(hdr, TIPC_NAMED_MSG);
1492 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1493 msg_set_nametype(hdr, ua->sa.type);
1494 msg_set_nameinst(hdr, ua->sa.instance);
1495 msg_set_lookup_scope(hdr, ua->scope);
1496 } else { /* TIPC_SOCKET_ADDR */
1497 msg_set_type(hdr, TIPC_DIRECT_MSG);
1498 msg_set_lookup_scope(hdr, 0);
1499 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1500 }
1501
1502 /* Add message body */
1503 __skb_queue_head_init(&pkts);
1504 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
1505 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1506 if (unlikely(rc != dlen))
1507 return rc;
1508 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1509 __skb_queue_purge(&pkts);
1510 return -ENOMEM;
1511 }
1512
1513 /* Send message */
1514 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1515 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid);
1516 if (unlikely(rc == -ELINKCONG)) {
1517 tipc_dest_push(clinks, skaddr.node, 0);
1518 tsk->cong_link_cnt++;
1519 rc = 0;
1520 }
1521
1522 if (unlikely(syn && !rc)) {
1523 tipc_set_sk_state(sk, TIPC_CONNECTING);
1524 if (dlen && timeout) {
1525 timeout = msecs_to_jiffies(timeout);
1526 tipc_wait_for_connect(sock, &timeout);
1527 }
1528 }
1529
1530 return rc ? rc : dlen;
1531}
1532
1533/**
1534 * tipc_sendstream - send stream-oriented data
1535 * @sock: socket structure
1536 * @m: data to send
1537 * @dsz: total length of data to be transmitted
1538 *
1539 * Used for SOCK_STREAM data.
1540 *
1541 * Return: the number of bytes sent on success (or partial success),
1542 * or errno if no data sent
1543 */
1544static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1545{
1546 struct sock *sk = sock->sk;
1547 int ret;
1548
1549 lock_sock(sk);
1550 ret = __tipc_sendstream(sock, m, dsz);
1551 release_sock(sk);
1552
1553 return ret;
1554}
1555
1556static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1557{
1558 struct sock *sk = sock->sk;
1559 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1560 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1561 struct sk_buff_head *txq = &sk->sk_write_queue;
1562 struct tipc_sock *tsk = tipc_sk(sk);
1563 struct tipc_msg *hdr = &tsk->phdr;
1564 struct net *net = sock_net(sk);
1565 struct sk_buff *skb;
1566 u32 dnode = tsk_peer_node(tsk);
1567 int maxnagle = tsk->maxnagle;
1568 int maxpkt = tsk->max_pkt;
1569 int send, sent = 0;
1570 int blocks, rc = 0;
1571
1572 if (unlikely(dlen > INT_MAX))
1573 return -EMSGSIZE;
1574
1575 /* Handle implicit connection setup */
1576 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) {
1577 rc = __tipc_sendmsg(sock, m, dlen);
1578 if (dlen && dlen == rc) {
1579 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1580 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1581 }
1582 return rc;
1583 }
1584
1585 do {
1586 rc = tipc_wait_for_cond(sock, &timeout,
1587 (!tsk->cong_link_cnt &&
1588 !tsk_conn_cong(tsk) &&
1589 tipc_sk_connected(sk)));
1590 if (unlikely(rc))
1591 break;
1592 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1593 blocks = tsk->snd_backlog;
1594 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1595 send <= maxnagle) {
1596 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1597 if (unlikely(rc < 0))
1598 break;
1599 blocks += rc;
1600 tsk->msg_acc++;
1601 if (blocks <= 64 && tsk->expect_ack) {
1602 tsk->snd_backlog = blocks;
1603 sent += send;
1604 break;
1605 } else if (blocks > 64) {
1606 tsk->pkt_cnt += skb_queue_len(txq);
1607 } else {
1608 skb = skb_peek_tail(txq);
1609 if (skb) {
1610 msg_set_ack_required(buf_msg(skb));
1611 tsk->expect_ack = true;
1612 } else {
1613 tsk->expect_ack = false;
1614 }
1615 tsk->msg_acc = 0;
1616 tsk->pkt_cnt = 0;
1617 }
1618 } else {
1619 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1620 if (unlikely(rc != send))
1621 break;
1622 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1623 }
1624 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1625 TIPC_DUMP_SK_SNDQ, " ");
1626 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1627 if (unlikely(rc == -ELINKCONG)) {
1628 tsk->cong_link_cnt = 1;
1629 rc = 0;
1630 }
1631 if (likely(!rc)) {
1632 tsk->snt_unacked += blocks;
1633 tsk->snd_backlog = 0;
1634 sent += send;
1635 }
1636 } while (sent < dlen && !rc);
1637
1638 return sent ? sent : rc;
1639}
1640
1641/**
1642 * tipc_send_packet - send a connection-oriented message
1643 * @sock: socket structure
1644 * @m: message to send
1645 * @dsz: length of data to be transmitted
1646 *
1647 * Used for SOCK_SEQPACKET messages.
1648 *
1649 * Return: the number of bytes sent on success, or errno otherwise
1650 */
1651static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1652{
1653 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1654 return -EMSGSIZE;
1655
1656 return tipc_sendstream(sock, m, dsz);
1657}
1658
1659/* tipc_sk_finish_conn - complete the setup of a connection
1660 */
1661static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1662 u32 peer_node)
1663{
1664 struct sock *sk = &tsk->sk;
1665 struct net *net = sock_net(sk);
1666 struct tipc_msg *msg = &tsk->phdr;
1667
1668 msg_set_syn(msg, 0);
1669 msg_set_destnode(msg, peer_node);
1670 msg_set_destport(msg, peer_port);
1671 msg_set_type(msg, TIPC_CONN_MSG);
1672 msg_set_lookup_scope(msg, 0);
1673 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1674
1675 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1676 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1677 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1678 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1679 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1680 tsk_set_nagle(tsk);
1681 __skb_queue_purge(&sk->sk_write_queue);
1682 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1683 return;
1684
1685 /* Fall back to message based flow control */
1686 tsk->rcv_win = FLOWCTL_MSG_WIN;
1687 tsk->snd_win = FLOWCTL_MSG_WIN;
1688}
1689
1690/**
1691 * tipc_sk_set_orig_addr - capture sender's address for received message
1692 * @m: descriptor for message info
1693 * @skb: received message
1694 *
1695 * Note: Address is not captured if not requested by receiver.
1696 */
1697static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1698{
1699 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1700 struct tipc_msg *hdr = buf_msg(skb);
1701
1702 if (!srcaddr)
1703 return;
1704
1705 srcaddr->sock.family = AF_TIPC;
1706 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1707 srcaddr->sock.scope = 0;
1708 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1709 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1710 srcaddr->sock.addr.name.domain = 0;
1711 m->msg_namelen = sizeof(struct sockaddr_tipc);
1712
1713 if (!msg_in_group(hdr))
1714 return;
1715
1716 /* Group message users may also want to know sending member's id */
1717 srcaddr->member.family = AF_TIPC;
1718 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1719 srcaddr->member.scope = 0;
1720 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1721 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1722 srcaddr->member.addr.name.domain = 0;
1723 m->msg_namelen = sizeof(*srcaddr);
1724}
1725
1726/**
1727 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1728 * @m: descriptor for message info
1729 * @skb: received message buffer
1730 * @tsk: TIPC port associated with message
1731 *
1732 * Note: Ancillary data is not captured if not requested by receiver.
1733 *
1734 * Return: 0 if successful, otherwise errno
1735 */
1736static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1737 struct tipc_sock *tsk)
1738{
1739 struct tipc_msg *hdr;
1740 u32 data[3] = {0,};
1741 bool has_addr;
1742 int dlen, rc;
1743
1744 if (likely(m->msg_controllen == 0))
1745 return 0;
1746
1747 hdr = buf_msg(skb);
1748 dlen = msg_data_sz(hdr);
1749
1750 /* Capture errored message object, if any */
1751 if (msg_errcode(hdr)) {
1752 if (skb_linearize(skb))
1753 return -ENOMEM;
1754 hdr = buf_msg(skb);
1755 data[0] = msg_errcode(hdr);
1756 data[1] = dlen;
1757 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1758 if (rc || !dlen)
1759 return rc;
1760 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1761 if (rc)
1762 return rc;
1763 }
1764
1765 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1766 switch (msg_type(hdr)) {
1767 case TIPC_NAMED_MSG:
1768 has_addr = true;
1769 data[0] = msg_nametype(hdr);
1770 data[1] = msg_namelower(hdr);
1771 data[2] = data[1];
1772 break;
1773 case TIPC_MCAST_MSG:
1774 has_addr = true;
1775 data[0] = msg_nametype(hdr);
1776 data[1] = msg_namelower(hdr);
1777 data[2] = msg_nameupper(hdr);
1778 break;
1779 case TIPC_CONN_MSG:
1780 has_addr = !!tsk->conn_addrtype;
1781 data[0] = msg_nametype(&tsk->phdr);
1782 data[1] = msg_nameinst(&tsk->phdr);
1783 data[2] = data[1];
1784 break;
1785 default:
1786 has_addr = false;
1787 }
1788 if (!has_addr)
1789 return 0;
1790 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1791}
1792
1793static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1794{
1795 struct sock *sk = &tsk->sk;
1796 struct sk_buff *skb = NULL;
1797 struct tipc_msg *msg;
1798 u32 peer_port = tsk_peer_port(tsk);
1799 u32 dnode = tsk_peer_node(tsk);
1800
1801 if (!tipc_sk_connected(sk))
1802 return NULL;
1803 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1804 dnode, tsk_own_node(tsk), peer_port,
1805 tsk->portid, TIPC_OK);
1806 if (!skb)
1807 return NULL;
1808 msg = buf_msg(skb);
1809 msg_set_conn_ack(msg, tsk->rcv_unacked);
1810 tsk->rcv_unacked = 0;
1811
1812 /* Adjust to and advertize the correct window limit */
1813 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1814 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1815 msg_set_adv_win(msg, tsk->rcv_win);
1816 }
1817 return skb;
1818}
1819
1820static void tipc_sk_send_ack(struct tipc_sock *tsk)
1821{
1822 struct sk_buff *skb;
1823
1824 skb = tipc_sk_build_ack(tsk);
1825 if (!skb)
1826 return;
1827
1828 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1829 msg_link_selector(buf_msg(skb)));
1830}
1831
1832static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1833{
1834 struct sock *sk = sock->sk;
1835 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1836 long timeo = *timeop;
1837 int err = sock_error(sk);
1838
1839 if (err)
1840 return err;
1841
1842 for (;;) {
1843 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1844 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1845 err = -ENOTCONN;
1846 break;
1847 }
1848 add_wait_queue(sk_sleep(sk), &wait);
1849 release_sock(sk);
1850 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1851 sched_annotate_sleep();
1852 lock_sock(sk);
1853 remove_wait_queue(sk_sleep(sk), &wait);
1854 }
1855 err = 0;
1856 if (!skb_queue_empty(&sk->sk_receive_queue))
1857 break;
1858 err = -EAGAIN;
1859 if (!timeo)
1860 break;
1861 err = sock_intr_errno(timeo);
1862 if (signal_pending(current))
1863 break;
1864
1865 err = sock_error(sk);
1866 if (err)
1867 break;
1868 }
1869 *timeop = timeo;
1870 return err;
1871}
1872
1873/**
1874 * tipc_recvmsg - receive packet-oriented message
1875 * @sock: network socket
1876 * @m: descriptor for message info
1877 * @buflen: length of user buffer area
1878 * @flags: receive flags
1879 *
1880 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1881 * If the complete message doesn't fit in user area, truncate it.
1882 *
1883 * Return: size of returned message data, errno otherwise
1884 */
1885static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1886 size_t buflen, int flags)
1887{
1888 struct sock *sk = sock->sk;
1889 bool connected = !tipc_sk_type_connectionless(sk);
1890 struct tipc_sock *tsk = tipc_sk(sk);
1891 int rc, err, hlen, dlen, copy;
1892 struct tipc_skb_cb *skb_cb;
1893 struct sk_buff_head xmitq;
1894 struct tipc_msg *hdr;
1895 struct sk_buff *skb;
1896 bool grp_evt;
1897 long timeout;
1898
1899 /* Catch invalid receive requests */
1900 if (unlikely(!buflen))
1901 return -EINVAL;
1902
1903 lock_sock(sk);
1904 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1905 rc = -ENOTCONN;
1906 goto exit;
1907 }
1908 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1909
1910 /* Step rcv queue to first msg with data or error; wait if necessary */
1911 do {
1912 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1913 if (unlikely(rc))
1914 goto exit;
1915 skb = skb_peek(&sk->sk_receive_queue);
1916 skb_cb = TIPC_SKB_CB(skb);
1917 hdr = buf_msg(skb);
1918 dlen = msg_data_sz(hdr);
1919 hlen = msg_hdr_sz(hdr);
1920 err = msg_errcode(hdr);
1921 grp_evt = msg_is_grp_evt(hdr);
1922 if (likely(dlen || err))
1923 break;
1924 tsk_advance_rx_queue(sk);
1925 } while (1);
1926
1927 /* Collect msg meta data, including error code and rejected data */
1928 tipc_sk_set_orig_addr(m, skb);
1929 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1930 if (unlikely(rc))
1931 goto exit;
1932 hdr = buf_msg(skb);
1933
1934 /* Capture data if non-error msg, otherwise just set return value */
1935 if (likely(!err)) {
1936 int offset = skb_cb->bytes_read;
1937
1938 copy = min_t(int, dlen - offset, buflen);
1939 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1940 if (unlikely(rc))
1941 goto exit;
1942 if (unlikely(offset + copy < dlen)) {
1943 if (flags & MSG_EOR) {
1944 if (!(flags & MSG_PEEK))
1945 skb_cb->bytes_read = offset + copy;
1946 } else {
1947 m->msg_flags |= MSG_TRUNC;
1948 skb_cb->bytes_read = 0;
1949 }
1950 } else {
1951 if (flags & MSG_EOR)
1952 m->msg_flags |= MSG_EOR;
1953 skb_cb->bytes_read = 0;
1954 }
1955 } else {
1956 copy = 0;
1957 rc = 0;
1958 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) {
1959 rc = -ECONNRESET;
1960 goto exit;
1961 }
1962 }
1963
1964 /* Mark message as group event if applicable */
1965 if (unlikely(grp_evt)) {
1966 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1967 m->msg_flags |= MSG_EOR;
1968 m->msg_flags |= MSG_OOB;
1969 copy = 0;
1970 }
1971
1972 /* Caption of data or error code/rejected data was successful */
1973 if (unlikely(flags & MSG_PEEK))
1974 goto exit;
1975
1976 /* Send group flow control advertisement when applicable */
1977 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1978 __skb_queue_head_init(&xmitq);
1979 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1980 msg_orignode(hdr), msg_origport(hdr),
1981 &xmitq);
1982 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1983 }
1984
1985 if (skb_cb->bytes_read)
1986 goto exit;
1987
1988 tsk_advance_rx_queue(sk);
1989
1990 if (likely(!connected))
1991 goto exit;
1992
1993 /* Send connection flow control advertisement when applicable */
1994 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1995 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1996 tipc_sk_send_ack(tsk);
1997exit:
1998 release_sock(sk);
1999 return rc ? rc : copy;
2000}
2001
2002/**
2003 * tipc_recvstream - receive stream-oriented data
2004 * @sock: network socket
2005 * @m: descriptor for message info
2006 * @buflen: total size of user buffer area
2007 * @flags: receive flags
2008 *
2009 * Used for SOCK_STREAM messages only. If not enough data is available
2010 * will optionally wait for more; never truncates data.
2011 *
2012 * Return: size of returned message data, errno otherwise
2013 */
2014static int tipc_recvstream(struct socket *sock, struct msghdr *m,
2015 size_t buflen, int flags)
2016{
2017 struct sock *sk = sock->sk;
2018 struct tipc_sock *tsk = tipc_sk(sk);
2019 struct sk_buff *skb;
2020 struct tipc_msg *hdr;
2021 struct tipc_skb_cb *skb_cb;
2022 bool peek = flags & MSG_PEEK;
2023 int offset, required, copy, copied = 0;
2024 int hlen, dlen, err, rc;
2025 long timeout;
2026
2027 /* Catch invalid receive attempts */
2028 if (unlikely(!buflen))
2029 return -EINVAL;
2030
2031 lock_sock(sk);
2032
2033 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2034 rc = -ENOTCONN;
2035 goto exit;
2036 }
2037 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2038 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2039
2040 do {
2041 /* Look at first msg in receive queue; wait if necessary */
2042 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2043 if (unlikely(rc))
2044 break;
2045 skb = skb_peek(&sk->sk_receive_queue);
2046 skb_cb = TIPC_SKB_CB(skb);
2047 hdr = buf_msg(skb);
2048 dlen = msg_data_sz(hdr);
2049 hlen = msg_hdr_sz(hdr);
2050 err = msg_errcode(hdr);
2051
2052 /* Discard any empty non-errored (SYN-) message */
2053 if (unlikely(!dlen && !err)) {
2054 tsk_advance_rx_queue(sk);
2055 continue;
2056 }
2057
2058 /* Collect msg meta data, incl. error code and rejected data */
2059 if (!copied) {
2060 tipc_sk_set_orig_addr(m, skb);
2061 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2062 if (rc)
2063 break;
2064 hdr = buf_msg(skb);
2065 }
2066
2067 /* Copy data if msg ok, otherwise return error/partial data */
2068 if (likely(!err)) {
2069 offset = skb_cb->bytes_read;
2070 copy = min_t(int, dlen - offset, buflen - copied);
2071 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2072 if (unlikely(rc))
2073 break;
2074 copied += copy;
2075 offset += copy;
2076 if (unlikely(offset < dlen)) {
2077 if (!peek)
2078 skb_cb->bytes_read = offset;
2079 break;
2080 }
2081 } else {
2082 rc = 0;
2083 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2084 rc = -ECONNRESET;
2085 if (copied || rc)
2086 break;
2087 }
2088
2089 if (unlikely(peek))
2090 break;
2091
2092 tsk_advance_rx_queue(sk);
2093
2094 /* Send connection flow control advertisement when applicable */
2095 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2096 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2097 tipc_sk_send_ack(tsk);
2098
2099 /* Exit if all requested data or FIN/error received */
2100 if (copied == buflen || err)
2101 break;
2102
2103 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2104exit:
2105 release_sock(sk);
2106 return copied ? copied : rc;
2107}
2108
2109/**
2110 * tipc_write_space - wake up thread if port congestion is released
2111 * @sk: socket
2112 */
2113static void tipc_write_space(struct sock *sk)
2114{
2115 struct socket_wq *wq;
2116
2117 rcu_read_lock();
2118 wq = rcu_dereference(sk->sk_wq);
2119 if (skwq_has_sleeper(wq))
2120 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2121 EPOLLWRNORM | EPOLLWRBAND);
2122 rcu_read_unlock();
2123}
2124
2125/**
2126 * tipc_data_ready - wake up threads to indicate messages have been received
2127 * @sk: socket
2128 */
2129static void tipc_data_ready(struct sock *sk)
2130{
2131 struct socket_wq *wq;
2132
2133 trace_sk_data_ready(sk);
2134
2135 rcu_read_lock();
2136 wq = rcu_dereference(sk->sk_wq);
2137 if (skwq_has_sleeper(wq))
2138 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2139 EPOLLRDNORM | EPOLLRDBAND);
2140 rcu_read_unlock();
2141}
2142
2143static void tipc_sock_destruct(struct sock *sk)
2144{
2145 __skb_queue_purge(&sk->sk_receive_queue);
2146}
2147
2148static void tipc_sk_proto_rcv(struct sock *sk,
2149 struct sk_buff_head *inputq,
2150 struct sk_buff_head *xmitq)
2151{
2152 struct sk_buff *skb = __skb_dequeue(inputq);
2153 struct tipc_sock *tsk = tipc_sk(sk);
2154 struct tipc_msg *hdr = buf_msg(skb);
2155 struct tipc_group *grp = tsk->group;
2156 bool wakeup = false;
2157
2158 switch (msg_user(hdr)) {
2159 case CONN_MANAGER:
2160 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2161 return;
2162 case SOCK_WAKEUP:
2163 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2164 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2165 smp_wmb();
2166 tsk->cong_link_cnt--;
2167 wakeup = true;
2168 tipc_sk_push_backlog(tsk, false);
2169 break;
2170 case GROUP_PROTOCOL:
2171 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2172 break;
2173 case TOP_SRV:
2174 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2175 hdr, inputq, xmitq);
2176 break;
2177 default:
2178 break;
2179 }
2180
2181 if (wakeup)
2182 sk->sk_write_space(sk);
2183
2184 kfree_skb(skb);
2185}
2186
2187/**
2188 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2189 * @tsk: TIPC socket
2190 * @skb: pointer to message buffer.
2191 * @xmitq: for Nagle ACK if any
2192 * Return: true if message should be added to receive queue, false otherwise
2193 */
2194static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2195 struct sk_buff_head *xmitq)
2196{
2197 struct sock *sk = &tsk->sk;
2198 struct net *net = sock_net(sk);
2199 struct tipc_msg *hdr = buf_msg(skb);
2200 bool con_msg = msg_connected(hdr);
2201 u32 pport = tsk_peer_port(tsk);
2202 u32 pnode = tsk_peer_node(tsk);
2203 u32 oport = msg_origport(hdr);
2204 u32 onode = msg_orignode(hdr);
2205 int err = msg_errcode(hdr);
2206 unsigned long delay;
2207
2208 if (unlikely(msg_mcast(hdr)))
2209 return false;
2210 tsk->oneway = 0;
2211
2212 switch (sk->sk_state) {
2213 case TIPC_CONNECTING:
2214 /* Setup ACK */
2215 if (likely(con_msg)) {
2216 if (err)
2217 break;
2218 tipc_sk_finish_conn(tsk, oport, onode);
2219 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2220 /* ACK+ message with data is added to receive queue */
2221 if (msg_data_sz(hdr))
2222 return true;
2223 /* Empty ACK-, - wake up sleeping connect() and drop */
2224 sk->sk_state_change(sk);
2225 msg_set_dest_droppable(hdr, 1);
2226 return false;
2227 }
2228 /* Ignore connectionless message if not from listening socket */
2229 if (oport != pport || onode != pnode)
2230 return false;
2231
2232 /* Rejected SYN */
2233 if (err != TIPC_ERR_OVERLOAD)
2234 break;
2235
2236 /* Prepare for new setup attempt if we have a SYN clone */
2237 if (skb_queue_empty(&sk->sk_write_queue))
2238 break;
2239 get_random_bytes(&delay, 2);
2240 delay %= (tsk->conn_timeout / 4);
2241 delay = msecs_to_jiffies(delay + 100);
2242 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2243 return false;
2244 case TIPC_OPEN:
2245 case TIPC_DISCONNECTING:
2246 return false;
2247 case TIPC_LISTEN:
2248 /* Accept only SYN message */
2249 if (!msg_is_syn(hdr) &&
2250 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2251 return false;
2252 if (!con_msg && !err)
2253 return true;
2254 return false;
2255 case TIPC_ESTABLISHED:
2256 if (!skb_queue_empty(&sk->sk_write_queue))
2257 tipc_sk_push_backlog(tsk, false);
2258 /* Accept only connection-based messages sent by peer */
2259 if (likely(con_msg && !err && pport == oport &&
2260 pnode == onode)) {
2261 if (msg_ack_required(hdr)) {
2262 struct sk_buff *skb;
2263
2264 skb = tipc_sk_build_ack(tsk);
2265 if (skb) {
2266 msg_set_nagle_ack(buf_msg(skb));
2267 __skb_queue_tail(xmitq, skb);
2268 }
2269 }
2270 return true;
2271 }
2272 if (!tsk_peer_msg(tsk, hdr))
2273 return false;
2274 if (!err)
2275 return true;
2276 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2277 tipc_node_remove_conn(net, pnode, tsk->portid);
2278 sk->sk_state_change(sk);
2279 return true;
2280 default:
2281 pr_err("Unknown sk_state %u\n", sk->sk_state);
2282 }
2283 /* Abort connection setup attempt */
2284 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2285 sk->sk_err = ECONNREFUSED;
2286 sk->sk_state_change(sk);
2287 return true;
2288}
2289
2290/**
2291 * rcvbuf_limit - get proper overload limit of socket receive queue
2292 * @sk: socket
2293 * @skb: message
2294 *
2295 * For connection oriented messages, irrespective of importance,
2296 * default queue limit is 2 MB.
2297 *
2298 * For connectionless messages, queue limits are based on message
2299 * importance as follows:
2300 *
2301 * TIPC_LOW_IMPORTANCE (2 MB)
2302 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2303 * TIPC_HIGH_IMPORTANCE (8 MB)
2304 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2305 *
2306 * Return: overload limit according to corresponding message importance
2307 */
2308static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2309{
2310 struct tipc_sock *tsk = tipc_sk(sk);
2311 struct tipc_msg *hdr = buf_msg(skb);
2312
2313 if (unlikely(msg_in_group(hdr)))
2314 return READ_ONCE(sk->sk_rcvbuf);
2315
2316 if (unlikely(!msg_connected(hdr)))
2317 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2318
2319 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2320 return READ_ONCE(sk->sk_rcvbuf);
2321
2322 return FLOWCTL_MSG_LIM;
2323}
2324
2325/**
2326 * tipc_sk_filter_rcv - validate incoming message
2327 * @sk: socket
2328 * @skb: pointer to message.
2329 * @xmitq: output message area (FIXME)
2330 *
2331 * Enqueues message on receive queue if acceptable; optionally handles
2332 * disconnect indication for a connected socket.
2333 *
2334 * Called with socket lock already taken
2335 */
2336static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2337 struct sk_buff_head *xmitq)
2338{
2339 bool sk_conn = !tipc_sk_type_connectionless(sk);
2340 struct tipc_sock *tsk = tipc_sk(sk);
2341 struct tipc_group *grp = tsk->group;
2342 struct tipc_msg *hdr = buf_msg(skb);
2343 struct net *net = sock_net(sk);
2344 struct sk_buff_head inputq;
2345 int mtyp = msg_type(hdr);
2346 int limit, err = TIPC_OK;
2347
2348 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2349 TIPC_SKB_CB(skb)->bytes_read = 0;
2350 __skb_queue_head_init(&inputq);
2351 __skb_queue_tail(&inputq, skb);
2352
2353 if (unlikely(!msg_isdata(hdr)))
2354 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2355
2356 if (unlikely(grp))
2357 tipc_group_filter_msg(grp, &inputq, xmitq);
2358
2359 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2360 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2361
2362 /* Validate and add to receive buffer if there is space */
2363 while ((skb = __skb_dequeue(&inputq))) {
2364 hdr = buf_msg(skb);
2365 limit = rcvbuf_limit(sk, skb);
2366 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2367 (!sk_conn && msg_connected(hdr)) ||
2368 (!grp && msg_in_group(hdr)))
2369 err = TIPC_ERR_NO_PORT;
2370 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2371 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2372 "err_overload2!");
2373 atomic_inc(&sk->sk_drops);
2374 err = TIPC_ERR_OVERLOAD;
2375 }
2376
2377 if (unlikely(err)) {
2378 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2379 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2380 "@filter_rcv!");
2381 __skb_queue_tail(xmitq, skb);
2382 }
2383 err = TIPC_OK;
2384 continue;
2385 }
2386 __skb_queue_tail(&sk->sk_receive_queue, skb);
2387 skb_set_owner_r(skb, sk);
2388 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2389 "rcvq >90% allocated!");
2390 sk->sk_data_ready(sk);
2391 }
2392}
2393
2394/**
2395 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2396 * @sk: socket
2397 * @skb: message
2398 *
2399 * Caller must hold socket lock
2400 */
2401static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2402{
2403 unsigned int before = sk_rmem_alloc_get(sk);
2404 struct sk_buff_head xmitq;
2405 unsigned int added;
2406
2407 __skb_queue_head_init(&xmitq);
2408
2409 tipc_sk_filter_rcv(sk, skb, &xmitq);
2410 added = sk_rmem_alloc_get(sk) - before;
2411 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2412
2413 /* Send pending response/rejected messages, if any */
2414 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2415 return 0;
2416}
2417
2418/**
2419 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2420 * inputq and try adding them to socket or backlog queue
2421 * @inputq: list of incoming buffers with potentially different destinations
2422 * @sk: socket where the buffers should be enqueued
2423 * @dport: port number for the socket
2424 * @xmitq: output queue
2425 *
2426 * Caller must hold socket lock
2427 */
2428static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2429 u32 dport, struct sk_buff_head *xmitq)
2430{
2431 unsigned long time_limit = jiffies + usecs_to_jiffies(20000);
2432 struct sk_buff *skb;
2433 unsigned int lim;
2434 atomic_t *dcnt;
2435 u32 onode;
2436
2437 while (skb_queue_len(inputq)) {
2438 if (unlikely(time_after_eq(jiffies, time_limit)))
2439 return;
2440
2441 skb = tipc_skb_dequeue(inputq, dport);
2442 if (unlikely(!skb))
2443 return;
2444
2445 /* Add message directly to receive queue if possible */
2446 if (!sock_owned_by_user(sk)) {
2447 tipc_sk_filter_rcv(sk, skb, xmitq);
2448 continue;
2449 }
2450
2451 /* Try backlog, compensating for double-counted bytes */
2452 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2453 if (!sk->sk_backlog.len)
2454 atomic_set(dcnt, 0);
2455 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2456 if (likely(!sk_add_backlog(sk, skb, lim))) {
2457 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2458 "bklg & rcvq >90% allocated!");
2459 continue;
2460 }
2461
2462 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2463 /* Overload => reject message back to sender */
2464 onode = tipc_own_addr(sock_net(sk));
2465 atomic_inc(&sk->sk_drops);
2466 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2467 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2468 "@sk_enqueue!");
2469 __skb_queue_tail(xmitq, skb);
2470 }
2471 break;
2472 }
2473}
2474
2475/**
2476 * tipc_sk_rcv - handle a chain of incoming buffers
2477 * @net: the associated network namespace
2478 * @inputq: buffer list containing the buffers
2479 * Consumes all buffers in list until inputq is empty
2480 * Note: may be called in multiple threads referring to the same queue
2481 */
2482void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2483{
2484 struct sk_buff_head xmitq;
2485 u32 dnode, dport = 0;
2486 int err;
2487 struct tipc_sock *tsk;
2488 struct sock *sk;
2489 struct sk_buff *skb;
2490
2491 __skb_queue_head_init(&xmitq);
2492 while (skb_queue_len(inputq)) {
2493 dport = tipc_skb_peek_port(inputq, dport);
2494 tsk = tipc_sk_lookup(net, dport);
2495
2496 if (likely(tsk)) {
2497 sk = &tsk->sk;
2498 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2499 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2500 spin_unlock_bh(&sk->sk_lock.slock);
2501 }
2502 /* Send pending response/rejected messages, if any */
2503 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2504 sock_put(sk);
2505 continue;
2506 }
2507 /* No destination socket => dequeue skb if still there */
2508 skb = tipc_skb_dequeue(inputq, dport);
2509 if (!skb)
2510 return;
2511
2512 /* Try secondary lookup if unresolved named message */
2513 err = TIPC_ERR_NO_PORT;
2514 if (tipc_msg_lookup_dest(net, skb, &err))
2515 goto xmit;
2516
2517 /* Prepare for message rejection */
2518 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2519 continue;
2520
2521 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2522xmit:
2523 dnode = msg_destnode(buf_msg(skb));
2524 tipc_node_xmit_skb(net, skb, dnode, dport);
2525 }
2526}
2527
2528static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2529{
2530 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2531 struct sock *sk = sock->sk;
2532 int done;
2533
2534 do {
2535 int err = sock_error(sk);
2536 if (err)
2537 return err;
2538 if (!*timeo_p)
2539 return -ETIMEDOUT;
2540 if (signal_pending(current))
2541 return sock_intr_errno(*timeo_p);
2542 if (sk->sk_state == TIPC_DISCONNECTING)
2543 break;
2544
2545 add_wait_queue(sk_sleep(sk), &wait);
2546 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2547 &wait);
2548 remove_wait_queue(sk_sleep(sk), &wait);
2549 } while (!done);
2550 return 0;
2551}
2552
2553static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2554{
2555 if (addr->family != AF_TIPC)
2556 return false;
2557 if (addr->addrtype == TIPC_SERVICE_RANGE)
2558 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2559 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2560 addr->addrtype == TIPC_SOCKET_ADDR);
2561}
2562
2563/**
2564 * tipc_connect - establish a connection to another TIPC port
2565 * @sock: socket structure
2566 * @dest: socket address for destination port
2567 * @destlen: size of socket address data structure
2568 * @flags: file-related flags associated with socket
2569 *
2570 * Return: 0 on success, errno otherwise
2571 */
2572static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2573 int destlen, int flags)
2574{
2575 struct sock *sk = sock->sk;
2576 struct tipc_sock *tsk = tipc_sk(sk);
2577 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2578 struct msghdr m = {NULL,};
2579 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2580 int previous;
2581 int res = 0;
2582
2583 if (destlen != sizeof(struct sockaddr_tipc))
2584 return -EINVAL;
2585
2586 lock_sock(sk);
2587
2588 if (tsk->group) {
2589 res = -EINVAL;
2590 goto exit;
2591 }
2592
2593 if (dst->family == AF_UNSPEC) {
2594 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2595 if (!tipc_sk_type_connectionless(sk))
2596 res = -EINVAL;
2597 goto exit;
2598 }
2599 if (!tipc_sockaddr_is_sane(dst)) {
2600 res = -EINVAL;
2601 goto exit;
2602 }
2603 /* DGRAM/RDM connect(), just save the destaddr */
2604 if (tipc_sk_type_connectionless(sk)) {
2605 memcpy(&tsk->peer, dest, destlen);
2606 goto exit;
2607 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2608 res = -EINVAL;
2609 goto exit;
2610 }
2611
2612 previous = sk->sk_state;
2613
2614 switch (sk->sk_state) {
2615 case TIPC_OPEN:
2616 /* Send a 'SYN-' to destination */
2617 m.msg_name = dest;
2618 m.msg_namelen = destlen;
2619 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2620
2621 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2622 * indicate send_msg() is never blocked.
2623 */
2624 if (!timeout)
2625 m.msg_flags = MSG_DONTWAIT;
2626
2627 res = __tipc_sendmsg(sock, &m, 0);
2628 if ((res < 0) && (res != -EWOULDBLOCK))
2629 goto exit;
2630
2631 /* Just entered TIPC_CONNECTING state; the only
2632 * difference is that return value in non-blocking
2633 * case is EINPROGRESS, rather than EALREADY.
2634 */
2635 res = -EINPROGRESS;
2636 fallthrough;
2637 case TIPC_CONNECTING:
2638 if (!timeout) {
2639 if (previous == TIPC_CONNECTING)
2640 res = -EALREADY;
2641 goto exit;
2642 }
2643 timeout = msecs_to_jiffies(timeout);
2644 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2645 res = tipc_wait_for_connect(sock, &timeout);
2646 break;
2647 case TIPC_ESTABLISHED:
2648 res = -EISCONN;
2649 break;
2650 default:
2651 res = -EINVAL;
2652 }
2653
2654exit:
2655 release_sock(sk);
2656 return res;
2657}
2658
2659/**
2660 * tipc_listen - allow socket to listen for incoming connections
2661 * @sock: socket structure
2662 * @len: (unused)
2663 *
2664 * Return: 0 on success, errno otherwise
2665 */
2666static int tipc_listen(struct socket *sock, int len)
2667{
2668 struct sock *sk = sock->sk;
2669 int res;
2670
2671 lock_sock(sk);
2672 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2673 release_sock(sk);
2674
2675 return res;
2676}
2677
2678static int tipc_wait_for_accept(struct socket *sock, long timeo)
2679{
2680 struct sock *sk = sock->sk;
2681 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2682 int err;
2683
2684 /* True wake-one mechanism for incoming connections: only
2685 * one process gets woken up, not the 'whole herd'.
2686 * Since we do not 'race & poll' for established sockets
2687 * anymore, the common case will execute the loop only once.
2688 */
2689 for (;;) {
2690 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2691 add_wait_queue(sk_sleep(sk), &wait);
2692 release_sock(sk);
2693 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
2694 lock_sock(sk);
2695 remove_wait_queue(sk_sleep(sk), &wait);
2696 }
2697 err = 0;
2698 if (!skb_queue_empty(&sk->sk_receive_queue))
2699 break;
2700 err = -EAGAIN;
2701 if (!timeo)
2702 break;
2703 err = sock_intr_errno(timeo);
2704 if (signal_pending(current))
2705 break;
2706 }
2707 return err;
2708}
2709
2710/**
2711 * tipc_accept - wait for connection request
2712 * @sock: listening socket
2713 * @new_sock: new socket that is to be connected
2714 * @flags: file-related flags associated with socket
2715 * @kern: caused by kernel or by userspace?
2716 *
2717 * Return: 0 on success, errno otherwise
2718 */
2719static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2720 bool kern)
2721{
2722 struct sock *new_sk, *sk = sock->sk;
2723 struct tipc_sock *new_tsock;
2724 struct msghdr m = {NULL,};
2725 struct tipc_msg *msg;
2726 struct sk_buff *buf;
2727 long timeo;
2728 int res;
2729
2730 lock_sock(sk);
2731
2732 if (sk->sk_state != TIPC_LISTEN) {
2733 res = -EINVAL;
2734 goto exit;
2735 }
2736 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2737 res = tipc_wait_for_accept(sock, timeo);
2738 if (res)
2739 goto exit;
2740
2741 buf = skb_peek(&sk->sk_receive_queue);
2742
2743 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2744 if (res)
2745 goto exit;
2746 security_sk_clone(sock->sk, new_sock->sk);
2747
2748 new_sk = new_sock->sk;
2749 new_tsock = tipc_sk(new_sk);
2750 msg = buf_msg(buf);
2751
2752 /* we lock on new_sk; but lockdep sees the lock on sk */
2753 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2754
2755 /*
2756 * Reject any stray messages received by new socket
2757 * before the socket lock was taken (very, very unlikely)
2758 */
2759 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2760
2761 /* Connect new socket to it's peer */
2762 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2763
2764 tsk_set_importance(new_sk, msg_importance(msg));
2765 if (msg_named(msg)) {
2766 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2767 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2768 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2769 }
2770
2771 /*
2772 * Respond to 'SYN-' by discarding it & returning 'ACK'.
2773 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'.
2774 */
2775 if (!msg_data_sz(msg)) {
2776 tsk_advance_rx_queue(sk);
2777 } else {
2778 __skb_dequeue(&sk->sk_receive_queue);
2779 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2780 skb_set_owner_r(buf, new_sk);
2781 }
2782 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2783 __tipc_sendstream(new_sock, &m, 0);
2784 release_sock(new_sk);
2785exit:
2786 release_sock(sk);
2787 return res;
2788}
2789
2790/**
2791 * tipc_shutdown - shutdown socket connection
2792 * @sock: socket structure
2793 * @how: direction to close (must be SHUT_RDWR)
2794 *
2795 * Terminates connection (if necessary), then purges socket's receive queue.
2796 *
2797 * Return: 0 on success, errno otherwise
2798 */
2799static int tipc_shutdown(struct socket *sock, int how)
2800{
2801 struct sock *sk = sock->sk;
2802 int res;
2803
2804 if (how != SHUT_RDWR)
2805 return -EINVAL;
2806
2807 lock_sock(sk);
2808
2809 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2810 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2811 sk->sk_shutdown = SHUTDOWN_MASK;
2812
2813 if (sk->sk_state == TIPC_DISCONNECTING) {
2814 /* Discard any unreceived messages */
2815 __skb_queue_purge(&sk->sk_receive_queue);
2816
2817 res = 0;
2818 } else {
2819 res = -ENOTCONN;
2820 }
2821 /* Wake up anyone sleeping in poll. */
2822 sk->sk_state_change(sk);
2823
2824 release_sock(sk);
2825 return res;
2826}
2827
2828static void tipc_sk_check_probing_state(struct sock *sk,
2829 struct sk_buff_head *list)
2830{
2831 struct tipc_sock *tsk = tipc_sk(sk);
2832 u32 pnode = tsk_peer_node(tsk);
2833 u32 pport = tsk_peer_port(tsk);
2834 u32 self = tsk_own_node(tsk);
2835 u32 oport = tsk->portid;
2836 struct sk_buff *skb;
2837
2838 if (tsk->probe_unacked) {
2839 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2840 sk->sk_err = ECONNABORTED;
2841 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2842 sk->sk_state_change(sk);
2843 return;
2844 }
2845 /* Prepare new probe */
2846 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2847 pnode, self, pport, oport, TIPC_OK);
2848 if (skb)
2849 __skb_queue_tail(list, skb);
2850 tsk->probe_unacked = true;
2851 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2852}
2853
2854static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2855{
2856 struct tipc_sock *tsk = tipc_sk(sk);
2857
2858 /* Try again later if dest link is congested */
2859 if (tsk->cong_link_cnt) {
2860 sk_reset_timer(sk, &sk->sk_timer,
2861 jiffies + msecs_to_jiffies(100));
2862 return;
2863 }
2864 /* Prepare SYN for retransmit */
2865 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2866}
2867
2868static void tipc_sk_timeout(struct timer_list *t)
2869{
2870 struct sock *sk = from_timer(sk, t, sk_timer);
2871 struct tipc_sock *tsk = tipc_sk(sk);
2872 u32 pnode = tsk_peer_node(tsk);
2873 struct sk_buff_head list;
2874 int rc = 0;
2875
2876 __skb_queue_head_init(&list);
2877 bh_lock_sock(sk);
2878
2879 /* Try again later if socket is busy */
2880 if (sock_owned_by_user(sk)) {
2881 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2882 bh_unlock_sock(sk);
2883 sock_put(sk);
2884 return;
2885 }
2886
2887 if (sk->sk_state == TIPC_ESTABLISHED)
2888 tipc_sk_check_probing_state(sk, &list);
2889 else if (sk->sk_state == TIPC_CONNECTING)
2890 tipc_sk_retry_connect(sk, &list);
2891
2892 bh_unlock_sock(sk);
2893
2894 if (!skb_queue_empty(&list))
2895 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2896
2897 /* SYN messages may cause link congestion */
2898 if (rc == -ELINKCONG) {
2899 tipc_dest_push(&tsk->cong_links, pnode, 0);
2900 tsk->cong_link_cnt = 1;
2901 }
2902 sock_put(sk);
2903}
2904
2905static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2906{
2907 struct sock *sk = &tsk->sk;
2908 struct net *net = sock_net(sk);
2909 struct tipc_socket_addr skaddr;
2910 struct publication *p;
2911 u32 key;
2912
2913 if (tipc_sk_connected(sk))
2914 return -EINVAL;
2915 key = tsk->portid + tsk->pub_count + 1;
2916 if (key == tsk->portid)
2917 return -EADDRINUSE;
2918 skaddr.ref = tsk->portid;
2919 skaddr.node = tipc_own_addr(net);
2920 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2921 if (unlikely(!p))
2922 return -EINVAL;
2923
2924 list_add(&p->binding_sock, &tsk->publications);
2925 tsk->pub_count++;
2926 tsk->published = true;
2927 return 0;
2928}
2929
2930static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2931{
2932 struct net *net = sock_net(&tsk->sk);
2933 struct publication *safe, *p;
2934 struct tipc_uaddr _ua;
2935 int rc = -EINVAL;
2936
2937 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2938 if (!ua) {
2939 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2940 p->sr.type, p->sr.lower, p->sr.upper);
2941 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2942 continue;
2943 }
2944 /* Unbind specific publication */
2945 if (p->scope != ua->scope)
2946 continue;
2947 if (p->sr.type != ua->sr.type)
2948 continue;
2949 if (p->sr.lower != ua->sr.lower)
2950 continue;
2951 if (p->sr.upper != ua->sr.upper)
2952 break;
2953 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2954 rc = 0;
2955 break;
2956 }
2957 if (list_empty(&tsk->publications)) {
2958 tsk->published = 0;
2959 rc = 0;
2960 }
2961 return rc;
2962}
2963
2964/* tipc_sk_reinit: set non-zero address in all existing sockets
2965 * when we go from standalone to network mode.
2966 */
2967void tipc_sk_reinit(struct net *net)
2968{
2969 struct tipc_net *tn = net_generic(net, tipc_net_id);
2970 struct rhashtable_iter iter;
2971 struct tipc_sock *tsk;
2972 struct tipc_msg *msg;
2973
2974 rhashtable_walk_enter(&tn->sk_rht, &iter);
2975
2976 do {
2977 rhashtable_walk_start(&iter);
2978
2979 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2980 sock_hold(&tsk->sk);
2981 rhashtable_walk_stop(&iter);
2982 lock_sock(&tsk->sk);
2983 msg = &tsk->phdr;
2984 msg_set_prevnode(msg, tipc_own_addr(net));
2985 msg_set_orignode(msg, tipc_own_addr(net));
2986 release_sock(&tsk->sk);
2987 rhashtable_walk_start(&iter);
2988 sock_put(&tsk->sk);
2989 }
2990
2991 rhashtable_walk_stop(&iter);
2992 } while (tsk == ERR_PTR(-EAGAIN));
2993
2994 rhashtable_walk_exit(&iter);
2995}
2996
2997static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2998{
2999 struct tipc_net *tn = net_generic(net, tipc_net_id);
3000 struct tipc_sock *tsk;
3001
3002 rcu_read_lock();
3003 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
3004 if (tsk)
3005 sock_hold(&tsk->sk);
3006 rcu_read_unlock();
3007
3008 return tsk;
3009}
3010
3011static int tipc_sk_insert(struct tipc_sock *tsk)
3012{
3013 struct sock *sk = &tsk->sk;
3014 struct net *net = sock_net(sk);
3015 struct tipc_net *tn = net_generic(net, tipc_net_id);
3016 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
3017 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT;
3018
3019 while (remaining--) {
3020 portid++;
3021 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
3022 portid = TIPC_MIN_PORT;
3023 tsk->portid = portid;
3024 sock_hold(&tsk->sk);
3025 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3026 tsk_rht_params))
3027 return 0;
3028 sock_put(&tsk->sk);
3029 }
3030
3031 return -1;
3032}
3033
3034static void tipc_sk_remove(struct tipc_sock *tsk)
3035{
3036 struct sock *sk = &tsk->sk;
3037 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3038
3039 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3040 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3041 __sock_put(sk);
3042 }
3043}
3044
3045static const struct rhashtable_params tsk_rht_params = {
3046 .nelem_hint = 192,
3047 .head_offset = offsetof(struct tipc_sock, node),
3048 .key_offset = offsetof(struct tipc_sock, portid),
3049 .key_len = sizeof(u32), /* portid */
3050 .max_size = 1048576,
3051 .min_size = 256,
3052 .automatic_shrinking = true,
3053};
3054
3055int tipc_sk_rht_init(struct net *net)
3056{
3057 struct tipc_net *tn = net_generic(net, tipc_net_id);
3058
3059 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3060}
3061
3062void tipc_sk_rht_destroy(struct net *net)
3063{
3064 struct tipc_net *tn = net_generic(net, tipc_net_id);
3065
3066 /* Wait for socket readers to complete */
3067 synchronize_net();
3068
3069 rhashtable_destroy(&tn->sk_rht);
3070}
3071
3072static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3073{
3074 struct net *net = sock_net(&tsk->sk);
3075 struct tipc_group *grp = tsk->group;
3076 struct tipc_msg *hdr = &tsk->phdr;
3077 struct tipc_uaddr ua;
3078 int rc;
3079
3080 if (mreq->type < TIPC_RESERVED_TYPES)
3081 return -EACCES;
3082 if (mreq->scope > TIPC_NODE_SCOPE)
3083 return -EINVAL;
3084 if (mreq->scope != TIPC_NODE_SCOPE)
3085 mreq->scope = TIPC_CLUSTER_SCOPE;
3086 if (grp)
3087 return -EACCES;
3088 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3089 if (!grp)
3090 return -ENOMEM;
3091 tsk->group = grp;
3092 msg_set_lookup_scope(hdr, mreq->scope);
3093 msg_set_nametype(hdr, mreq->type);
3094 msg_set_dest_droppable(hdr, true);
3095 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3096 mreq->type, mreq->instance, mreq->instance);
3097 tipc_nametbl_build_group(net, grp, &ua);
3098 rc = tipc_sk_publish(tsk, &ua);
3099 if (rc) {
3100 tipc_group_delete(net, grp);
3101 tsk->group = NULL;
3102 return rc;
3103 }
3104 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3105 tsk->mc_method.rcast = true;
3106 tsk->mc_method.mandatory = true;
3107 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3108 return rc;
3109}
3110
3111static int tipc_sk_leave(struct tipc_sock *tsk)
3112{
3113 struct net *net = sock_net(&tsk->sk);
3114 struct tipc_group *grp = tsk->group;
3115 struct tipc_uaddr ua;
3116 int scope;
3117
3118 if (!grp)
3119 return -EINVAL;
3120 ua.addrtype = TIPC_SERVICE_RANGE;
3121 tipc_group_self(grp, &ua.sr, &scope);
3122 ua.scope = scope;
3123 tipc_group_delete(net, grp);
3124 tsk->group = NULL;
3125 tipc_sk_withdraw(tsk, &ua);
3126 return 0;
3127}
3128
3129/**
3130 * tipc_setsockopt - set socket option
3131 * @sock: socket structure
3132 * @lvl: option level
3133 * @opt: option identifier
3134 * @ov: pointer to new option value
3135 * @ol: length of option value
3136 *
3137 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3138 * (to ease compatibility).
3139 *
3140 * Return: 0 on success, errno otherwise
3141 */
3142static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3143 sockptr_t ov, unsigned int ol)
3144{
3145 struct sock *sk = sock->sk;
3146 struct tipc_sock *tsk = tipc_sk(sk);
3147 struct tipc_group_req mreq;
3148 u32 value = 0;
3149 int res = 0;
3150
3151 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3152 return 0;
3153 if (lvl != SOL_TIPC)
3154 return -ENOPROTOOPT;
3155
3156 switch (opt) {
3157 case TIPC_IMPORTANCE:
3158 case TIPC_SRC_DROPPABLE:
3159 case TIPC_DEST_DROPPABLE:
3160 case TIPC_CONN_TIMEOUT:
3161 case TIPC_NODELAY:
3162 if (ol < sizeof(value))
3163 return -EINVAL;
3164 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3165 return -EFAULT;
3166 break;
3167 case TIPC_GROUP_JOIN:
3168 if (ol < sizeof(mreq))
3169 return -EINVAL;
3170 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3171 return -EFAULT;
3172 break;
3173 default:
3174 if (!sockptr_is_null(ov) || ol)
3175 return -EINVAL;
3176 }
3177
3178 lock_sock(sk);
3179
3180 switch (opt) {
3181 case TIPC_IMPORTANCE:
3182 res = tsk_set_importance(sk, value);
3183 break;
3184 case TIPC_SRC_DROPPABLE:
3185 if (sock->type != SOCK_STREAM)
3186 tsk_set_unreliable(tsk, value);
3187 else
3188 res = -ENOPROTOOPT;
3189 break;
3190 case TIPC_DEST_DROPPABLE:
3191 tsk_set_unreturnable(tsk, value);
3192 break;
3193 case TIPC_CONN_TIMEOUT:
3194 tipc_sk(sk)->conn_timeout = value;
3195 break;
3196 case TIPC_MCAST_BROADCAST:
3197 tsk->mc_method.rcast = false;
3198 tsk->mc_method.mandatory = true;
3199 break;
3200 case TIPC_MCAST_REPLICAST:
3201 tsk->mc_method.rcast = true;
3202 tsk->mc_method.mandatory = true;
3203 break;
3204 case TIPC_GROUP_JOIN:
3205 res = tipc_sk_join(tsk, &mreq);
3206 break;
3207 case TIPC_GROUP_LEAVE:
3208 res = tipc_sk_leave(tsk);
3209 break;
3210 case TIPC_NODELAY:
3211 tsk->nodelay = !!value;
3212 tsk_set_nagle(tsk);
3213 break;
3214 default:
3215 res = -EINVAL;
3216 }
3217
3218 release_sock(sk);
3219
3220 return res;
3221}
3222
3223/**
3224 * tipc_getsockopt - get socket option
3225 * @sock: socket structure
3226 * @lvl: option level
3227 * @opt: option identifier
3228 * @ov: receptacle for option value
3229 * @ol: receptacle for length of option value
3230 *
3231 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3232 * (to ease compatibility).
3233 *
3234 * Return: 0 on success, errno otherwise
3235 */
3236static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3237 char __user *ov, int __user *ol)
3238{
3239 struct sock *sk = sock->sk;
3240 struct tipc_sock *tsk = tipc_sk(sk);
3241 struct tipc_service_range seq;
3242 int len, scope;
3243 u32 value;
3244 int res;
3245
3246 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3247 return put_user(0, ol);
3248 if (lvl != SOL_TIPC)
3249 return -ENOPROTOOPT;
3250 res = get_user(len, ol);
3251 if (res)
3252 return res;
3253
3254 lock_sock(sk);
3255
3256 switch (opt) {
3257 case TIPC_IMPORTANCE:
3258 value = tsk_importance(tsk);
3259 break;
3260 case TIPC_SRC_DROPPABLE:
3261 value = tsk_unreliable(tsk);
3262 break;
3263 case TIPC_DEST_DROPPABLE:
3264 value = tsk_unreturnable(tsk);
3265 break;
3266 case TIPC_CONN_TIMEOUT:
3267 value = tsk->conn_timeout;
3268 /* no need to set "res", since already 0 at this point */
3269 break;
3270 case TIPC_NODE_RECVQ_DEPTH:
3271 value = 0; /* was tipc_queue_size, now obsolete */
3272 break;
3273 case TIPC_SOCK_RECVQ_DEPTH:
3274 value = skb_queue_len(&sk->sk_receive_queue);
3275 break;
3276 case TIPC_SOCK_RECVQ_USED:
3277 value = sk_rmem_alloc_get(sk);
3278 break;
3279 case TIPC_GROUP_JOIN:
3280 seq.type = 0;
3281 if (tsk->group)
3282 tipc_group_self(tsk->group, &seq, &scope);
3283 value = seq.type;
3284 break;
3285 default:
3286 res = -EINVAL;
3287 }
3288
3289 release_sock(sk);
3290
3291 if (res)
3292 return res; /* "get" failed */
3293
3294 if (len < sizeof(value))
3295 return -EINVAL;
3296
3297 if (copy_to_user(ov, &value, sizeof(value)))
3298 return -EFAULT;
3299
3300 return put_user(sizeof(value), ol);
3301}
3302
3303static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3304{
3305 struct net *net = sock_net(sock->sk);
3306 struct tipc_sioc_nodeid_req nr = {0};
3307 struct tipc_sioc_ln_req lnr;
3308 void __user *argp = (void __user *)arg;
3309
3310 switch (cmd) {
3311 case SIOCGETLINKNAME:
3312 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3313 return -EFAULT;
3314 if (!tipc_node_get_linkname(net,
3315 lnr.bearer_id & 0xffff, lnr.peer,
3316 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3317 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3318 return -EFAULT;
3319 return 0;
3320 }
3321 return -EADDRNOTAVAIL;
3322 case SIOCGETNODEID:
3323 if (copy_from_user(&nr, argp, sizeof(nr)))
3324 return -EFAULT;
3325 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3326 return -EADDRNOTAVAIL;
3327 if (copy_to_user(argp, &nr, sizeof(nr)))
3328 return -EFAULT;
3329 return 0;
3330 default:
3331 return -ENOIOCTLCMD;
3332 }
3333}
3334
3335static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3336{
3337 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3338 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3339 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3340
3341 tsk1->peer.family = AF_TIPC;
3342 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3343 tsk1->peer.scope = TIPC_NODE_SCOPE;
3344 tsk1->peer.addr.id.ref = tsk2->portid;
3345 tsk1->peer.addr.id.node = onode;
3346 tsk2->peer.family = AF_TIPC;
3347 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3348 tsk2->peer.scope = TIPC_NODE_SCOPE;
3349 tsk2->peer.addr.id.ref = tsk1->portid;
3350 tsk2->peer.addr.id.node = onode;
3351
3352 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3353 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3354 return 0;
3355}
3356
3357/* Protocol switches for the various types of TIPC sockets */
3358
3359static const struct proto_ops msg_ops = {
3360 .owner = THIS_MODULE,
3361 .family = AF_TIPC,
3362 .release = tipc_release,
3363 .bind = tipc_bind,
3364 .connect = tipc_connect,
3365 .socketpair = tipc_socketpair,
3366 .accept = sock_no_accept,
3367 .getname = tipc_getname,
3368 .poll = tipc_poll,
3369 .ioctl = tipc_ioctl,
3370 .listen = sock_no_listen,
3371 .shutdown = tipc_shutdown,
3372 .setsockopt = tipc_setsockopt,
3373 .getsockopt = tipc_getsockopt,
3374 .sendmsg = tipc_sendmsg,
3375 .recvmsg = tipc_recvmsg,
3376 .mmap = sock_no_mmap,
3377};
3378
3379static const struct proto_ops packet_ops = {
3380 .owner = THIS_MODULE,
3381 .family = AF_TIPC,
3382 .release = tipc_release,
3383 .bind = tipc_bind,
3384 .connect = tipc_connect,
3385 .socketpair = tipc_socketpair,
3386 .accept = tipc_accept,
3387 .getname = tipc_getname,
3388 .poll = tipc_poll,
3389 .ioctl = tipc_ioctl,
3390 .listen = tipc_listen,
3391 .shutdown = tipc_shutdown,
3392 .setsockopt = tipc_setsockopt,
3393 .getsockopt = tipc_getsockopt,
3394 .sendmsg = tipc_send_packet,
3395 .recvmsg = tipc_recvmsg,
3396 .mmap = sock_no_mmap,
3397};
3398
3399static const struct proto_ops stream_ops = {
3400 .owner = THIS_MODULE,
3401 .family = AF_TIPC,
3402 .release = tipc_release,
3403 .bind = tipc_bind,
3404 .connect = tipc_connect,
3405 .socketpair = tipc_socketpair,
3406 .accept = tipc_accept,
3407 .getname = tipc_getname,
3408 .poll = tipc_poll,
3409 .ioctl = tipc_ioctl,
3410 .listen = tipc_listen,
3411 .shutdown = tipc_shutdown,
3412 .setsockopt = tipc_setsockopt,
3413 .getsockopt = tipc_getsockopt,
3414 .sendmsg = tipc_sendstream,
3415 .recvmsg = tipc_recvstream,
3416 .mmap = sock_no_mmap,
3417};
3418
3419static const struct net_proto_family tipc_family_ops = {
3420 .owner = THIS_MODULE,
3421 .family = AF_TIPC,
3422 .create = tipc_sk_create
3423};
3424
3425static struct proto tipc_proto = {
3426 .name = "TIPC",
3427 .owner = THIS_MODULE,
3428 .obj_size = sizeof(struct tipc_sock),
3429 .sysctl_rmem = sysctl_tipc_rmem
3430};
3431
3432/**
3433 * tipc_socket_init - initialize TIPC socket interface
3434 *
3435 * Return: 0 on success, errno otherwise
3436 */
3437int tipc_socket_init(void)
3438{
3439 int res;
3440
3441 res = proto_register(&tipc_proto, 1);
3442 if (res) {
3443 pr_err("Failed to register TIPC protocol type\n");
3444 goto out;
3445 }
3446
3447 res = sock_register(&tipc_family_ops);
3448 if (res) {
3449 pr_err("Failed to register TIPC socket type\n");
3450 proto_unregister(&tipc_proto);
3451 goto out;
3452 }
3453 out:
3454 return res;
3455}
3456
3457/**
3458 * tipc_socket_stop - stop TIPC socket interface
3459 */
3460void tipc_socket_stop(void)
3461{
3462 sock_unregister(tipc_family_ops.family);
3463 proto_unregister(&tipc_proto);
3464}
3465
3466/* Caller should hold socket lock for the passed tipc socket. */
3467static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3468{
3469 u32 peer_node, peer_port;
3470 u32 conn_type, conn_instance;
3471 struct nlattr *nest;
3472
3473 peer_node = tsk_peer_node(tsk);
3474 peer_port = tsk_peer_port(tsk);
3475 conn_type = msg_nametype(&tsk->phdr);
3476 conn_instance = msg_nameinst(&tsk->phdr);
3477 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3478 if (!nest)
3479 return -EMSGSIZE;
3480
3481 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3482 goto msg_full;
3483 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3484 goto msg_full;
3485
3486 if (tsk->conn_addrtype != 0) {
3487 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3488 goto msg_full;
3489 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3490 goto msg_full;
3491 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3492 goto msg_full;
3493 }
3494 nla_nest_end(skb, nest);
3495
3496 return 0;
3497
3498msg_full:
3499 nla_nest_cancel(skb, nest);
3500
3501 return -EMSGSIZE;
3502}
3503
3504static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3505 *tsk)
3506{
3507 struct net *net = sock_net(skb->sk);
3508 struct sock *sk = &tsk->sk;
3509
3510 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3511 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3512 return -EMSGSIZE;
3513
3514 if (tipc_sk_connected(sk)) {
3515 if (__tipc_nl_add_sk_con(skb, tsk))
3516 return -EMSGSIZE;
3517 } else if (!list_empty(&tsk->publications)) {
3518 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3519 return -EMSGSIZE;
3520 }
3521 return 0;
3522}
3523
3524/* Caller should hold socket lock for the passed tipc socket. */
3525static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3526 struct tipc_sock *tsk)
3527{
3528 struct nlattr *attrs;
3529 void *hdr;
3530
3531 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3532 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3533 if (!hdr)
3534 goto msg_cancel;
3535
3536 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3537 if (!attrs)
3538 goto genlmsg_cancel;
3539
3540 if (__tipc_nl_add_sk_info(skb, tsk))
3541 goto attr_msg_cancel;
3542
3543 nla_nest_end(skb, attrs);
3544 genlmsg_end(skb, hdr);
3545
3546 return 0;
3547
3548attr_msg_cancel:
3549 nla_nest_cancel(skb, attrs);
3550genlmsg_cancel:
3551 genlmsg_cancel(skb, hdr);
3552msg_cancel:
3553 return -EMSGSIZE;
3554}
3555
3556int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3557 int (*skb_handler)(struct sk_buff *skb,
3558 struct netlink_callback *cb,
3559 struct tipc_sock *tsk))
3560{
3561 struct rhashtable_iter *iter = (void *)cb->args[4];
3562 struct tipc_sock *tsk;
3563 int err;
3564
3565 rhashtable_walk_start(iter);
3566 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3567 if (IS_ERR(tsk)) {
3568 err = PTR_ERR(tsk);
3569 if (err == -EAGAIN) {
3570 err = 0;
3571 continue;
3572 }
3573 break;
3574 }
3575
3576 sock_hold(&tsk->sk);
3577 rhashtable_walk_stop(iter);
3578 lock_sock(&tsk->sk);
3579 err = skb_handler(skb, cb, tsk);
3580 if (err) {
3581 release_sock(&tsk->sk);
3582 sock_put(&tsk->sk);
3583 goto out;
3584 }
3585 release_sock(&tsk->sk);
3586 rhashtable_walk_start(iter);
3587 sock_put(&tsk->sk);
3588 }
3589 rhashtable_walk_stop(iter);
3590out:
3591 return skb->len;
3592}
3593EXPORT_SYMBOL(tipc_nl_sk_walk);
3594
3595int tipc_dump_start(struct netlink_callback *cb)
3596{
3597 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3598}
3599EXPORT_SYMBOL(tipc_dump_start);
3600
3601int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3602{
3603 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3604 struct rhashtable_iter *iter = (void *)cb->args[4];
3605 struct tipc_net *tn = tipc_net(net);
3606
3607 if (!iter) {
3608 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3609 if (!iter)
3610 return -ENOMEM;
3611
3612 cb->args[4] = (long)iter;
3613 }
3614
3615 rhashtable_walk_enter(&tn->sk_rht, iter);
3616 return 0;
3617}
3618
3619int tipc_dump_done(struct netlink_callback *cb)
3620{
3621 struct rhashtable_iter *hti = (void *)cb->args[4];
3622
3623 rhashtable_walk_exit(hti);
3624 kfree(hti);
3625 return 0;
3626}
3627EXPORT_SYMBOL(tipc_dump_done);
3628
3629int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3630 struct tipc_sock *tsk, u32 sk_filter_state,
3631 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3632{
3633 struct sock *sk = &tsk->sk;
3634 struct nlattr *attrs;
3635 struct nlattr *stat;
3636
3637 /*filter response w.r.t sk_state*/
3638 if (!(sk_filter_state & (1 << sk->sk_state)))
3639 return 0;
3640
3641 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3642 if (!attrs)
3643 goto msg_cancel;
3644
3645 if (__tipc_nl_add_sk_info(skb, tsk))
3646 goto attr_msg_cancel;
3647
3648 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3649 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3650 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3651 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3652 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3653 sock_i_uid(sk))) ||
3654 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3655 tipc_diag_gen_cookie(sk),
3656 TIPC_NLA_SOCK_PAD))
3657 goto attr_msg_cancel;
3658
3659 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3660 if (!stat)
3661 goto attr_msg_cancel;
3662
3663 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3664 skb_queue_len(&sk->sk_receive_queue)) ||
3665 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3666 skb_queue_len(&sk->sk_write_queue)) ||
3667 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3668 atomic_read(&sk->sk_drops)))
3669 goto stat_msg_cancel;
3670
3671 if (tsk->cong_link_cnt &&
3672 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3673 goto stat_msg_cancel;
3674
3675 if (tsk_conn_cong(tsk) &&
3676 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3677 goto stat_msg_cancel;
3678
3679 nla_nest_end(skb, stat);
3680
3681 if (tsk->group)
3682 if (tipc_group_fill_sock_diag(tsk->group, skb))
3683 goto stat_msg_cancel;
3684
3685 nla_nest_end(skb, attrs);
3686
3687 return 0;
3688
3689stat_msg_cancel:
3690 nla_nest_cancel(skb, stat);
3691attr_msg_cancel:
3692 nla_nest_cancel(skb, attrs);
3693msg_cancel:
3694 return -EMSGSIZE;
3695}
3696EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3697
3698int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3699{
3700 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3701}
3702
3703/* Caller should hold socket lock for the passed tipc socket. */
3704static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3705 struct netlink_callback *cb,
3706 struct publication *publ)
3707{
3708 void *hdr;
3709 struct nlattr *attrs;
3710
3711 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3712 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3713 if (!hdr)
3714 goto msg_cancel;
3715
3716 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3717 if (!attrs)
3718 goto genlmsg_cancel;
3719
3720 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3721 goto attr_msg_cancel;
3722 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3723 goto attr_msg_cancel;
3724 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3725 goto attr_msg_cancel;
3726 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3727 goto attr_msg_cancel;
3728
3729 nla_nest_end(skb, attrs);
3730 genlmsg_end(skb, hdr);
3731
3732 return 0;
3733
3734attr_msg_cancel:
3735 nla_nest_cancel(skb, attrs);
3736genlmsg_cancel:
3737 genlmsg_cancel(skb, hdr);
3738msg_cancel:
3739 return -EMSGSIZE;
3740}
3741
3742/* Caller should hold socket lock for the passed tipc socket. */
3743static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3744 struct netlink_callback *cb,
3745 struct tipc_sock *tsk, u32 *last_publ)
3746{
3747 int err;
3748 struct publication *p;
3749
3750 if (*last_publ) {
3751 list_for_each_entry(p, &tsk->publications, binding_sock) {
3752 if (p->key == *last_publ)
3753 break;
3754 }
3755 if (list_entry_is_head(p, &tsk->publications, binding_sock)) {
3756 /* We never set seq or call nl_dump_check_consistent()
3757 * this means that setting prev_seq here will cause the
3758 * consistence check to fail in the netlink callback
3759 * handler. Resulting in the last NLMSG_DONE message
3760 * having the NLM_F_DUMP_INTR flag set.
3761 */
3762 cb->prev_seq = 1;
3763 *last_publ = 0;
3764 return -EPIPE;
3765 }
3766 } else {
3767 p = list_first_entry(&tsk->publications, struct publication,
3768 binding_sock);
3769 }
3770
3771 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3772 err = __tipc_nl_add_sk_publ(skb, cb, p);
3773 if (err) {
3774 *last_publ = p->key;
3775 return err;
3776 }
3777 }
3778 *last_publ = 0;
3779
3780 return 0;
3781}
3782
3783int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3784{
3785 int err;
3786 u32 tsk_portid = cb->args[0];
3787 u32 last_publ = cb->args[1];
3788 u32 done = cb->args[2];
3789 struct net *net = sock_net(skb->sk);
3790 struct tipc_sock *tsk;
3791
3792 if (!tsk_portid) {
3793 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
3794 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3795
3796 if (!attrs[TIPC_NLA_SOCK])
3797 return -EINVAL;
3798
3799 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3800 attrs[TIPC_NLA_SOCK],
3801 tipc_nl_sock_policy, NULL);
3802 if (err)
3803 return err;
3804
3805 if (!sock[TIPC_NLA_SOCK_REF])
3806 return -EINVAL;
3807
3808 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3809 }
3810
3811 if (done)
3812 return 0;
3813
3814 tsk = tipc_sk_lookup(net, tsk_portid);
3815 if (!tsk)
3816 return -EINVAL;
3817
3818 lock_sock(&tsk->sk);
3819 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3820 if (!err)
3821 done = 1;
3822 release_sock(&tsk->sk);
3823 sock_put(&tsk->sk);
3824
3825 cb->args[0] = tsk_portid;
3826 cb->args[1] = last_publ;
3827 cb->args[2] = done;
3828
3829 return skb->len;
3830}
3831
3832/**
3833 * tipc_sk_filtering - check if a socket should be traced
3834 * @sk: the socket to be examined
3835 *
3836 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3837 * (portid, sock type, name type, name lower, name upper)
3838 *
3839 * Return: true if the socket meets the socket tuple data
3840 * (value 0 = 'any') or when there is no tuple set (all = 0),
3841 * otherwise false
3842 */
3843bool tipc_sk_filtering(struct sock *sk)
3844{
3845 struct tipc_sock *tsk;
3846 struct publication *p;
3847 u32 _port, _sktype, _type, _lower, _upper;
3848 u32 type = 0, lower = 0, upper = 0;
3849
3850 if (!sk)
3851 return true;
3852
3853 tsk = tipc_sk(sk);
3854
3855 _port = sysctl_tipc_sk_filter[0];
3856 _sktype = sysctl_tipc_sk_filter[1];
3857 _type = sysctl_tipc_sk_filter[2];
3858 _lower = sysctl_tipc_sk_filter[3];
3859 _upper = sysctl_tipc_sk_filter[4];
3860
3861 if (!_port && !_sktype && !_type && !_lower && !_upper)
3862 return true;
3863
3864 if (_port)
3865 return (_port == tsk->portid);
3866
3867 if (_sktype && _sktype != sk->sk_type)
3868 return false;
3869
3870 if (tsk->published) {
3871 p = list_first_entry_or_null(&tsk->publications,
3872 struct publication, binding_sock);
3873 if (p) {
3874 type = p->sr.type;
3875 lower = p->sr.lower;
3876 upper = p->sr.upper;
3877 }
3878 }
3879
3880 if (!tipc_sk_type_connectionless(sk)) {
3881 type = msg_nametype(&tsk->phdr);
3882 lower = msg_nameinst(&tsk->phdr);
3883 upper = lower;
3884 }
3885
3886 if ((_type && _type != type) || (_lower && _lower != lower) ||
3887 (_upper && _upper != upper))
3888 return false;
3889
3890 return true;
3891}
3892
3893u32 tipc_sock_get_portid(struct sock *sk)
3894{
3895 return (sk) ? (tipc_sk(sk))->portid : 0;
3896}
3897
3898/**
3899 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3900 * both the rcv and backlog queues are considered
3901 * @sk: tipc sk to be checked
3902 * @skb: tipc msg to be checked
3903 *
3904 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3905 */
3906
3907bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3908{
3909 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3910 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3911 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3912
3913 return (qsize > lim * 90 / 100);
3914}
3915
3916/**
3917 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3918 * only the rcv queue is considered
3919 * @sk: tipc sk to be checked
3920 * @skb: tipc msg to be checked
3921 *
3922 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3923 */
3924
3925bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3926{
3927 unsigned int lim = rcvbuf_limit(sk, skb);
3928 unsigned int qsize = sk_rmem_alloc_get(sk);
3929
3930 return (qsize > lim * 90 / 100);
3931}
3932
3933/**
3934 * tipc_sk_dump - dump TIPC socket
3935 * @sk: tipc sk to be dumped
3936 * @dqueues: bitmask to decide if any socket queue to be dumped?
3937 * - TIPC_DUMP_NONE: don't dump socket queues
3938 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3939 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3940 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3941 * - TIPC_DUMP_ALL: dump all the socket queues above
3942 * @buf: returned buffer of dump data in format
3943 */
3944int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3945{
3946 int i = 0;
3947 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3948 u32 conn_type, conn_instance;
3949 struct tipc_sock *tsk;
3950 struct publication *p;
3951 bool tsk_connected;
3952
3953 if (!sk) {
3954 i += scnprintf(buf, sz, "sk data: (null)\n");
3955 return i;
3956 }
3957
3958 tsk = tipc_sk(sk);
3959 tsk_connected = !tipc_sk_type_connectionless(sk);
3960
3961 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3962 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3963 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3964 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3965 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3966 if (tsk_connected) {
3967 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3968 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3969 conn_type = msg_nametype(&tsk->phdr);
3970 conn_instance = msg_nameinst(&tsk->phdr);
3971 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3972 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3973 }
3974 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3975 if (tsk->published) {
3976 p = list_first_entry_or_null(&tsk->publications,
3977 struct publication, binding_sock);
3978 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3979 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3980 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3981 }
3982 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3983 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3984 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3985 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3986 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3987 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3988 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3989 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3990 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3991 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3992 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3993 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3994 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3995 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3996
3997 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3998 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3999 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
4000 }
4001
4002 if (dqueues & TIPC_DUMP_SK_RCVQ) {
4003 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
4004 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
4005 }
4006
4007 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
4008 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
4009 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
4010 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
4011 i += scnprintf(buf + i, sz - i, " tail ");
4012 i += tipc_skb_dump(sk->sk_backlog.tail, false,
4013 buf + i);
4014 }
4015 }
4016
4017 return i;
4018}