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1/*
2 * net/tipc/socket.c: TIPC socket API
3 *
4 * Copyright (c) 2001-2007, 2012-2017, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <linux/rhashtable.h>
38#include <linux/sched/signal.h>
39
40#include "core.h"
41#include "name_table.h"
42#include "node.h"
43#include "link.h"
44#include "name_distr.h"
45#include "socket.h"
46#include "bcast.h"
47#include "netlink.h"
48#include "group.h"
49#include "trace.h"
50
51#define NAGLE_START_INIT 4
52#define NAGLE_START_MAX 1024
53#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
54#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
55#define TIPC_FWD_MSG 1
56#define TIPC_MAX_PORT 0xffffffff
57#define TIPC_MIN_PORT 1
58#define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
59
60enum {
61 TIPC_LISTEN = TCP_LISTEN,
62 TIPC_ESTABLISHED = TCP_ESTABLISHED,
63 TIPC_OPEN = TCP_CLOSE,
64 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
65 TIPC_CONNECTING = TCP_SYN_SENT,
66};
67
68struct sockaddr_pair {
69 struct sockaddr_tipc sock;
70 struct sockaddr_tipc member;
71};
72
73/**
74 * struct tipc_sock - TIPC socket structure
75 * @sk: socket - interacts with 'port' and with user via the socket API
76 * @conn_type: TIPC type used when connection was established
77 * @conn_instance: TIPC instance used when connection was established
78 * @published: non-zero if port has one or more associated names
79 * @max_pkt: maximum packet size "hint" used when building messages sent by port
80 * @maxnagle: maximum size of msg which can be subject to nagle
81 * @portid: unique port identity in TIPC socket hash table
82 * @phdr: preformatted message header used when sending messages
83 * #cong_links: list of congested links
84 * @publications: list of publications for port
85 * @blocking_link: address of the congested link we are currently sleeping on
86 * @pub_count: total # of publications port has made during its lifetime
87 * @conn_timeout: the time we can wait for an unresponded setup request
88 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
89 * @cong_link_cnt: number of congested links
90 * @snt_unacked: # messages sent by socket, and not yet acked by peer
91 * @rcv_unacked: # messages read by user, but not yet acked back to peer
92 * @peer: 'connected' peer for dgram/rdm
93 * @node: hash table node
94 * @mc_method: cookie for use between socket and broadcast layer
95 * @rcu: rcu struct for tipc_sock
96 */
97struct tipc_sock {
98 struct sock sk;
99 u32 conn_type;
100 u32 conn_instance;
101 int published;
102 u32 max_pkt;
103 u32 maxnagle;
104 u32 portid;
105 struct tipc_msg phdr;
106 struct list_head cong_links;
107 struct list_head publications;
108 u32 pub_count;
109 atomic_t dupl_rcvcnt;
110 u16 conn_timeout;
111 bool probe_unacked;
112 u16 cong_link_cnt;
113 u16 snt_unacked;
114 u16 snd_win;
115 u16 peer_caps;
116 u16 rcv_unacked;
117 u16 rcv_win;
118 struct sockaddr_tipc peer;
119 struct rhash_head node;
120 struct tipc_mc_method mc_method;
121 struct rcu_head rcu;
122 struct tipc_group *group;
123 u32 oneway;
124 u32 nagle_start;
125 u16 snd_backlog;
126 u16 msg_acc;
127 u16 pkt_cnt;
128 bool expect_ack;
129 bool nodelay;
130 bool group_is_open;
131};
132
133static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
134static void tipc_data_ready(struct sock *sk);
135static void tipc_write_space(struct sock *sk);
136static void tipc_sock_destruct(struct sock *sk);
137static int tipc_release(struct socket *sock);
138static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
139 bool kern);
140static void tipc_sk_timeout(struct timer_list *t);
141static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
142 struct tipc_name_seq const *seq);
143static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
144 struct tipc_name_seq const *seq);
145static int tipc_sk_leave(struct tipc_sock *tsk);
146static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
147static int tipc_sk_insert(struct tipc_sock *tsk);
148static void tipc_sk_remove(struct tipc_sock *tsk);
149static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
150static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
151static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
152
153static const struct proto_ops packet_ops;
154static const struct proto_ops stream_ops;
155static const struct proto_ops msg_ops;
156static struct proto tipc_proto;
157static const struct rhashtable_params tsk_rht_params;
158
159static u32 tsk_own_node(struct tipc_sock *tsk)
160{
161 return msg_prevnode(&tsk->phdr);
162}
163
164static u32 tsk_peer_node(struct tipc_sock *tsk)
165{
166 return msg_destnode(&tsk->phdr);
167}
168
169static u32 tsk_peer_port(struct tipc_sock *tsk)
170{
171 return msg_destport(&tsk->phdr);
172}
173
174static bool tsk_unreliable(struct tipc_sock *tsk)
175{
176 return msg_src_droppable(&tsk->phdr) != 0;
177}
178
179static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
180{
181 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
182}
183
184static bool tsk_unreturnable(struct tipc_sock *tsk)
185{
186 return msg_dest_droppable(&tsk->phdr) != 0;
187}
188
189static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
190{
191 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
192}
193
194static int tsk_importance(struct tipc_sock *tsk)
195{
196 return msg_importance(&tsk->phdr);
197}
198
199static struct tipc_sock *tipc_sk(const struct sock *sk)
200{
201 return container_of(sk, struct tipc_sock, sk);
202}
203
204int tsk_set_importance(struct sock *sk, int imp)
205{
206 if (imp > TIPC_CRITICAL_IMPORTANCE)
207 return -EINVAL;
208 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
209 return 0;
210}
211
212static bool tsk_conn_cong(struct tipc_sock *tsk)
213{
214 return tsk->snt_unacked > tsk->snd_win;
215}
216
217static u16 tsk_blocks(int len)
218{
219 return ((len / FLOWCTL_BLK_SZ) + 1);
220}
221
222/* tsk_blocks(): translate a buffer size in bytes to number of
223 * advertisable blocks, taking into account the ratio truesize(len)/len
224 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
225 */
226static u16 tsk_adv_blocks(int len)
227{
228 return len / FLOWCTL_BLK_SZ / 4;
229}
230
231/* tsk_inc(): increment counter for sent or received data
232 * - If block based flow control is not supported by peer we
233 * fall back to message based ditto, incrementing the counter
234 */
235static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
236{
237 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
238 return ((msglen / FLOWCTL_BLK_SZ) + 1);
239 return 1;
240}
241
242/* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
243 */
244static void tsk_set_nagle(struct tipc_sock *tsk)
245{
246 struct sock *sk = &tsk->sk;
247
248 tsk->maxnagle = 0;
249 if (sk->sk_type != SOCK_STREAM)
250 return;
251 if (tsk->nodelay)
252 return;
253 if (!(tsk->peer_caps & TIPC_NAGLE))
254 return;
255 /* Limit node local buffer size to avoid receive queue overflow */
256 if (tsk->max_pkt == MAX_MSG_SIZE)
257 tsk->maxnagle = 1500;
258 else
259 tsk->maxnagle = tsk->max_pkt;
260}
261
262/**
263 * tsk_advance_rx_queue - discard first buffer in socket receive queue
264 *
265 * Caller must hold socket lock
266 */
267static void tsk_advance_rx_queue(struct sock *sk)
268{
269 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
270 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
271}
272
273/* tipc_sk_respond() : send response message back to sender
274 */
275static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
276{
277 u32 selector;
278 u32 dnode;
279 u32 onode = tipc_own_addr(sock_net(sk));
280
281 if (!tipc_msg_reverse(onode, &skb, err))
282 return;
283
284 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
285 dnode = msg_destnode(buf_msg(skb));
286 selector = msg_origport(buf_msg(skb));
287 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
288}
289
290/**
291 * tsk_rej_rx_queue - reject all buffers in socket receive queue
292 *
293 * Caller must hold socket lock
294 */
295static void tsk_rej_rx_queue(struct sock *sk, int error)
296{
297 struct sk_buff *skb;
298
299 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
300 tipc_sk_respond(sk, skb, error);
301}
302
303static bool tipc_sk_connected(struct sock *sk)
304{
305 return sk->sk_state == TIPC_ESTABLISHED;
306}
307
308/* tipc_sk_type_connectionless - check if the socket is datagram socket
309 * @sk: socket
310 *
311 * Returns true if connection less, false otherwise
312 */
313static bool tipc_sk_type_connectionless(struct sock *sk)
314{
315 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
316}
317
318/* tsk_peer_msg - verify if message was sent by connected port's peer
319 *
320 * Handles cases where the node's network address has changed from
321 * the default of <0.0.0> to its configured setting.
322 */
323static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
324{
325 struct sock *sk = &tsk->sk;
326 u32 self = tipc_own_addr(sock_net(sk));
327 u32 peer_port = tsk_peer_port(tsk);
328 u32 orig_node, peer_node;
329
330 if (unlikely(!tipc_sk_connected(sk)))
331 return false;
332
333 if (unlikely(msg_origport(msg) != peer_port))
334 return false;
335
336 orig_node = msg_orignode(msg);
337 peer_node = tsk_peer_node(tsk);
338
339 if (likely(orig_node == peer_node))
340 return true;
341
342 if (!orig_node && peer_node == self)
343 return true;
344
345 if (!peer_node && orig_node == self)
346 return true;
347
348 return false;
349}
350
351/* tipc_set_sk_state - set the sk_state of the socket
352 * @sk: socket
353 *
354 * Caller must hold socket lock
355 *
356 * Returns 0 on success, errno otherwise
357 */
358static int tipc_set_sk_state(struct sock *sk, int state)
359{
360 int oldsk_state = sk->sk_state;
361 int res = -EINVAL;
362
363 switch (state) {
364 case TIPC_OPEN:
365 res = 0;
366 break;
367 case TIPC_LISTEN:
368 case TIPC_CONNECTING:
369 if (oldsk_state == TIPC_OPEN)
370 res = 0;
371 break;
372 case TIPC_ESTABLISHED:
373 if (oldsk_state == TIPC_CONNECTING ||
374 oldsk_state == TIPC_OPEN)
375 res = 0;
376 break;
377 case TIPC_DISCONNECTING:
378 if (oldsk_state == TIPC_CONNECTING ||
379 oldsk_state == TIPC_ESTABLISHED)
380 res = 0;
381 break;
382 }
383
384 if (!res)
385 sk->sk_state = state;
386
387 return res;
388}
389
390static int tipc_sk_sock_err(struct socket *sock, long *timeout)
391{
392 struct sock *sk = sock->sk;
393 int err = sock_error(sk);
394 int typ = sock->type;
395
396 if (err)
397 return err;
398 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
399 if (sk->sk_state == TIPC_DISCONNECTING)
400 return -EPIPE;
401 else if (!tipc_sk_connected(sk))
402 return -ENOTCONN;
403 }
404 if (!*timeout)
405 return -EAGAIN;
406 if (signal_pending(current))
407 return sock_intr_errno(*timeout);
408
409 return 0;
410}
411
412#define tipc_wait_for_cond(sock_, timeo_, condition_) \
413({ \
414 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
415 struct sock *sk_; \
416 int rc_; \
417 \
418 while ((rc_ = !(condition_))) { \
419 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
420 smp_rmb(); \
421 sk_ = (sock_)->sk; \
422 rc_ = tipc_sk_sock_err((sock_), timeo_); \
423 if (rc_) \
424 break; \
425 add_wait_queue(sk_sleep(sk_), &wait_); \
426 release_sock(sk_); \
427 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
428 sched_annotate_sleep(); \
429 lock_sock(sk_); \
430 remove_wait_queue(sk_sleep(sk_), &wait_); \
431 } \
432 rc_; \
433})
434
435/**
436 * tipc_sk_create - create a TIPC socket
437 * @net: network namespace (must be default network)
438 * @sock: pre-allocated socket structure
439 * @protocol: protocol indicator (must be 0)
440 * @kern: caused by kernel or by userspace?
441 *
442 * This routine creates additional data structures used by the TIPC socket,
443 * initializes them, and links them together.
444 *
445 * Returns 0 on success, errno otherwise
446 */
447static int tipc_sk_create(struct net *net, struct socket *sock,
448 int protocol, int kern)
449{
450 const struct proto_ops *ops;
451 struct sock *sk;
452 struct tipc_sock *tsk;
453 struct tipc_msg *msg;
454
455 /* Validate arguments */
456 if (unlikely(protocol != 0))
457 return -EPROTONOSUPPORT;
458
459 switch (sock->type) {
460 case SOCK_STREAM:
461 ops = &stream_ops;
462 break;
463 case SOCK_SEQPACKET:
464 ops = &packet_ops;
465 break;
466 case SOCK_DGRAM:
467 case SOCK_RDM:
468 ops = &msg_ops;
469 break;
470 default:
471 return -EPROTOTYPE;
472 }
473
474 /* Allocate socket's protocol area */
475 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
476 if (sk == NULL)
477 return -ENOMEM;
478
479 tsk = tipc_sk(sk);
480 tsk->max_pkt = MAX_PKT_DEFAULT;
481 tsk->maxnagle = 0;
482 tsk->nagle_start = NAGLE_START_INIT;
483 INIT_LIST_HEAD(&tsk->publications);
484 INIT_LIST_HEAD(&tsk->cong_links);
485 msg = &tsk->phdr;
486
487 /* Finish initializing socket data structures */
488 sock->ops = ops;
489 sock_init_data(sock, sk);
490 tipc_set_sk_state(sk, TIPC_OPEN);
491 if (tipc_sk_insert(tsk)) {
492 pr_warn("Socket create failed; port number exhausted\n");
493 return -EINVAL;
494 }
495
496 /* Ensure tsk is visible before we read own_addr. */
497 smp_mb();
498
499 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
500 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
501
502 msg_set_origport(msg, tsk->portid);
503 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
504 sk->sk_shutdown = 0;
505 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
506 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
507 sk->sk_data_ready = tipc_data_ready;
508 sk->sk_write_space = tipc_write_space;
509 sk->sk_destruct = tipc_sock_destruct;
510 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
511 tsk->group_is_open = true;
512 atomic_set(&tsk->dupl_rcvcnt, 0);
513
514 /* Start out with safe limits until we receive an advertised window */
515 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
516 tsk->rcv_win = tsk->snd_win;
517
518 if (tipc_sk_type_connectionless(sk)) {
519 tsk_set_unreturnable(tsk, true);
520 if (sock->type == SOCK_DGRAM)
521 tsk_set_unreliable(tsk, true);
522 }
523 __skb_queue_head_init(&tsk->mc_method.deferredq);
524 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
525 return 0;
526}
527
528static void tipc_sk_callback(struct rcu_head *head)
529{
530 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
531
532 sock_put(&tsk->sk);
533}
534
535/* Caller should hold socket lock for the socket. */
536static void __tipc_shutdown(struct socket *sock, int error)
537{
538 struct sock *sk = sock->sk;
539 struct tipc_sock *tsk = tipc_sk(sk);
540 struct net *net = sock_net(sk);
541 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
542 u32 dnode = tsk_peer_node(tsk);
543 struct sk_buff *skb;
544
545 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
546 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
547 !tsk_conn_cong(tsk)));
548
549 /* Push out delayed messages if in Nagle mode */
550 tipc_sk_push_backlog(tsk, false);
551 /* Remove pending SYN */
552 __skb_queue_purge(&sk->sk_write_queue);
553
554 /* Remove partially received buffer if any */
555 skb = skb_peek(&sk->sk_receive_queue);
556 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
557 __skb_unlink(skb, &sk->sk_receive_queue);
558 kfree_skb(skb);
559 }
560
561 /* Reject all unreceived messages if connectionless */
562 if (tipc_sk_type_connectionless(sk)) {
563 tsk_rej_rx_queue(sk, error);
564 return;
565 }
566
567 switch (sk->sk_state) {
568 case TIPC_CONNECTING:
569 case TIPC_ESTABLISHED:
570 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
571 tipc_node_remove_conn(net, dnode, tsk->portid);
572 /* Send a FIN+/- to its peer */
573 skb = __skb_dequeue(&sk->sk_receive_queue);
574 if (skb) {
575 __skb_queue_purge(&sk->sk_receive_queue);
576 tipc_sk_respond(sk, skb, error);
577 break;
578 }
579 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
580 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
581 tsk_own_node(tsk), tsk_peer_port(tsk),
582 tsk->portid, error);
583 if (skb)
584 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
585 break;
586 case TIPC_LISTEN:
587 /* Reject all SYN messages */
588 tsk_rej_rx_queue(sk, error);
589 break;
590 default:
591 __skb_queue_purge(&sk->sk_receive_queue);
592 break;
593 }
594}
595
596/**
597 * tipc_release - destroy a TIPC socket
598 * @sock: socket to destroy
599 *
600 * This routine cleans up any messages that are still queued on the socket.
601 * For DGRAM and RDM socket types, all queued messages are rejected.
602 * For SEQPACKET and STREAM socket types, the first message is rejected
603 * and any others are discarded. (If the first message on a STREAM socket
604 * is partially-read, it is discarded and the next one is rejected instead.)
605 *
606 * NOTE: Rejected messages are not necessarily returned to the sender! They
607 * are returned or discarded according to the "destination droppable" setting
608 * specified for the message by the sender.
609 *
610 * Returns 0 on success, errno otherwise
611 */
612static int tipc_release(struct socket *sock)
613{
614 struct sock *sk = sock->sk;
615 struct tipc_sock *tsk;
616
617 /*
618 * Exit if socket isn't fully initialized (occurs when a failed accept()
619 * releases a pre-allocated child socket that was never used)
620 */
621 if (sk == NULL)
622 return 0;
623
624 tsk = tipc_sk(sk);
625 lock_sock(sk);
626
627 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
628 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
629 sk->sk_shutdown = SHUTDOWN_MASK;
630 tipc_sk_leave(tsk);
631 tipc_sk_withdraw(tsk, 0, NULL);
632 __skb_queue_purge(&tsk->mc_method.deferredq);
633 sk_stop_timer(sk, &sk->sk_timer);
634 tipc_sk_remove(tsk);
635
636 sock_orphan(sk);
637 /* Reject any messages that accumulated in backlog queue */
638 release_sock(sk);
639 tipc_dest_list_purge(&tsk->cong_links);
640 tsk->cong_link_cnt = 0;
641 call_rcu(&tsk->rcu, tipc_sk_callback);
642 sock->sk = NULL;
643
644 return 0;
645}
646
647/**
648 * tipc_bind - associate or disassocate TIPC name(s) with a socket
649 * @sock: socket structure
650 * @uaddr: socket address describing name(s) and desired operation
651 * @uaddr_len: size of socket address data structure
652 *
653 * Name and name sequence binding is indicated using a positive scope value;
654 * a negative scope value unbinds the specified name. Specifying no name
655 * (i.e. a socket address length of 0) unbinds all names from the socket.
656 *
657 * Returns 0 on success, errno otherwise
658 *
659 * NOTE: This routine doesn't need to take the socket lock since it doesn't
660 * access any non-constant socket information.
661 */
662static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
663 int uaddr_len)
664{
665 struct sock *sk = sock->sk;
666 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
667 struct tipc_sock *tsk = tipc_sk(sk);
668 int res = -EINVAL;
669
670 lock_sock(sk);
671 if (unlikely(!uaddr_len)) {
672 res = tipc_sk_withdraw(tsk, 0, NULL);
673 goto exit;
674 }
675 if (tsk->group) {
676 res = -EACCES;
677 goto exit;
678 }
679 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
680 res = -EINVAL;
681 goto exit;
682 }
683 if (addr->family != AF_TIPC) {
684 res = -EAFNOSUPPORT;
685 goto exit;
686 }
687
688 if (addr->addrtype == TIPC_ADDR_NAME)
689 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
690 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
691 res = -EAFNOSUPPORT;
692 goto exit;
693 }
694
695 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
696 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
697 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
698 res = -EACCES;
699 goto exit;
700 }
701
702 res = (addr->scope >= 0) ?
703 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
704 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
705exit:
706 release_sock(sk);
707 return res;
708}
709
710/**
711 * tipc_getname - get port ID of socket or peer socket
712 * @sock: socket structure
713 * @uaddr: area for returned socket address
714 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
715 *
716 * Returns 0 on success, errno otherwise
717 *
718 * NOTE: This routine doesn't need to take the socket lock since it only
719 * accesses socket information that is unchanging (or which changes in
720 * a completely predictable manner).
721 */
722static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
723 int peer)
724{
725 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
726 struct sock *sk = sock->sk;
727 struct tipc_sock *tsk = tipc_sk(sk);
728
729 memset(addr, 0, sizeof(*addr));
730 if (peer) {
731 if ((!tipc_sk_connected(sk)) &&
732 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
733 return -ENOTCONN;
734 addr->addr.id.ref = tsk_peer_port(tsk);
735 addr->addr.id.node = tsk_peer_node(tsk);
736 } else {
737 addr->addr.id.ref = tsk->portid;
738 addr->addr.id.node = tipc_own_addr(sock_net(sk));
739 }
740
741 addr->addrtype = TIPC_ADDR_ID;
742 addr->family = AF_TIPC;
743 addr->scope = 0;
744 addr->addr.name.domain = 0;
745
746 return sizeof(*addr);
747}
748
749/**
750 * tipc_poll - read and possibly block on pollmask
751 * @file: file structure associated with the socket
752 * @sock: socket for which to calculate the poll bits
753 * @wait: ???
754 *
755 * Returns pollmask value
756 *
757 * COMMENTARY:
758 * It appears that the usual socket locking mechanisms are not useful here
759 * since the pollmask info is potentially out-of-date the moment this routine
760 * exits. TCP and other protocols seem to rely on higher level poll routines
761 * to handle any preventable race conditions, so TIPC will do the same ...
762 *
763 * IMPORTANT: The fact that a read or write operation is indicated does NOT
764 * imply that the operation will succeed, merely that it should be performed
765 * and will not block.
766 */
767static __poll_t tipc_poll(struct file *file, struct socket *sock,
768 poll_table *wait)
769{
770 struct sock *sk = sock->sk;
771 struct tipc_sock *tsk = tipc_sk(sk);
772 __poll_t revents = 0;
773
774 sock_poll_wait(file, sock, wait);
775 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
776
777 if (sk->sk_shutdown & RCV_SHUTDOWN)
778 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
779 if (sk->sk_shutdown == SHUTDOWN_MASK)
780 revents |= EPOLLHUP;
781
782 switch (sk->sk_state) {
783 case TIPC_ESTABLISHED:
784 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
785 revents |= EPOLLOUT;
786 fallthrough;
787 case TIPC_LISTEN:
788 case TIPC_CONNECTING:
789 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
790 revents |= EPOLLIN | EPOLLRDNORM;
791 break;
792 case TIPC_OPEN:
793 if (tsk->group_is_open && !tsk->cong_link_cnt)
794 revents |= EPOLLOUT;
795 if (!tipc_sk_type_connectionless(sk))
796 break;
797 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
798 break;
799 revents |= EPOLLIN | EPOLLRDNORM;
800 break;
801 case TIPC_DISCONNECTING:
802 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
803 break;
804 }
805 return revents;
806}
807
808/**
809 * tipc_sendmcast - send multicast message
810 * @sock: socket structure
811 * @seq: destination address
812 * @msg: message to send
813 * @dlen: length of data to send
814 * @timeout: timeout to wait for wakeup
815 *
816 * Called from function tipc_sendmsg(), which has done all sanity checks
817 * Returns the number of bytes sent on success, or errno
818 */
819static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
820 struct msghdr *msg, size_t dlen, long timeout)
821{
822 struct sock *sk = sock->sk;
823 struct tipc_sock *tsk = tipc_sk(sk);
824 struct tipc_msg *hdr = &tsk->phdr;
825 struct net *net = sock_net(sk);
826 int mtu = tipc_bcast_get_mtu(net);
827 struct tipc_mc_method *method = &tsk->mc_method;
828 struct sk_buff_head pkts;
829 struct tipc_nlist dsts;
830 int rc;
831
832 if (tsk->group)
833 return -EACCES;
834
835 /* Block or return if any destination link is congested */
836 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
837 if (unlikely(rc))
838 return rc;
839
840 /* Lookup destination nodes */
841 tipc_nlist_init(&dsts, tipc_own_addr(net));
842 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
843 seq->upper, &dsts);
844 if (!dsts.local && !dsts.remote)
845 return -EHOSTUNREACH;
846
847 /* Build message header */
848 msg_set_type(hdr, TIPC_MCAST_MSG);
849 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
850 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
851 msg_set_destport(hdr, 0);
852 msg_set_destnode(hdr, 0);
853 msg_set_nametype(hdr, seq->type);
854 msg_set_namelower(hdr, seq->lower);
855 msg_set_nameupper(hdr, seq->upper);
856
857 /* Build message as chain of buffers */
858 __skb_queue_head_init(&pkts);
859 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
860
861 /* Send message if build was successful */
862 if (unlikely(rc == dlen)) {
863 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
864 TIPC_DUMP_SK_SNDQ, " ");
865 rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
866 &tsk->cong_link_cnt);
867 }
868
869 tipc_nlist_purge(&dsts);
870
871 return rc ? rc : dlen;
872}
873
874/**
875 * tipc_send_group_msg - send a message to a member in the group
876 * @net: network namespace
877 * @m: message to send
878 * @mb: group member
879 * @dnode: destination node
880 * @dport: destination port
881 * @dlen: total length of message data
882 */
883static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
884 struct msghdr *m, struct tipc_member *mb,
885 u32 dnode, u32 dport, int dlen)
886{
887 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
888 struct tipc_mc_method *method = &tsk->mc_method;
889 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
890 struct tipc_msg *hdr = &tsk->phdr;
891 struct sk_buff_head pkts;
892 int mtu, rc;
893
894 /* Complete message header */
895 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
896 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
897 msg_set_destport(hdr, dport);
898 msg_set_destnode(hdr, dnode);
899 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
900
901 /* Build message as chain of buffers */
902 __skb_queue_head_init(&pkts);
903 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
904 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
905 if (unlikely(rc != dlen))
906 return rc;
907
908 /* Send message */
909 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
910 if (unlikely(rc == -ELINKCONG)) {
911 tipc_dest_push(&tsk->cong_links, dnode, 0);
912 tsk->cong_link_cnt++;
913 }
914
915 /* Update send window */
916 tipc_group_update_member(mb, blks);
917
918 /* A broadcast sent within next EXPIRE period must follow same path */
919 method->rcast = true;
920 method->mandatory = true;
921 return dlen;
922}
923
924/**
925 * tipc_send_group_unicast - send message to a member in the group
926 * @sock: socket structure
927 * @m: message to send
928 * @dlen: total length of message data
929 * @timeout: timeout to wait for wakeup
930 *
931 * Called from function tipc_sendmsg(), which has done all sanity checks
932 * Returns the number of bytes sent on success, or errno
933 */
934static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
935 int dlen, long timeout)
936{
937 struct sock *sk = sock->sk;
938 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
939 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
940 struct tipc_sock *tsk = tipc_sk(sk);
941 struct net *net = sock_net(sk);
942 struct tipc_member *mb = NULL;
943 u32 node, port;
944 int rc;
945
946 node = dest->addr.id.node;
947 port = dest->addr.id.ref;
948 if (!port && !node)
949 return -EHOSTUNREACH;
950
951 /* Block or return if destination link or member is congested */
952 rc = tipc_wait_for_cond(sock, &timeout,
953 !tipc_dest_find(&tsk->cong_links, node, 0) &&
954 tsk->group &&
955 !tipc_group_cong(tsk->group, node, port, blks,
956 &mb));
957 if (unlikely(rc))
958 return rc;
959
960 if (unlikely(!mb))
961 return -EHOSTUNREACH;
962
963 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
964
965 return rc ? rc : dlen;
966}
967
968/**
969 * tipc_send_group_anycast - send message to any member with given identity
970 * @sock: socket structure
971 * @m: message to send
972 * @dlen: total length of message data
973 * @timeout: timeout to wait for wakeup
974 *
975 * Called from function tipc_sendmsg(), which has done all sanity checks
976 * Returns the number of bytes sent on success, or errno
977 */
978static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
979 int dlen, long timeout)
980{
981 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
982 struct sock *sk = sock->sk;
983 struct tipc_sock *tsk = tipc_sk(sk);
984 struct list_head *cong_links = &tsk->cong_links;
985 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
986 struct tipc_msg *hdr = &tsk->phdr;
987 struct tipc_member *first = NULL;
988 struct tipc_member *mbr = NULL;
989 struct net *net = sock_net(sk);
990 u32 node, port, exclude;
991 struct list_head dsts;
992 u32 type, inst, scope;
993 int lookups = 0;
994 int dstcnt, rc;
995 bool cong;
996
997 INIT_LIST_HEAD(&dsts);
998
999 type = msg_nametype(hdr);
1000 inst = dest->addr.name.name.instance;
1001 scope = msg_lookup_scope(hdr);
1002
1003 while (++lookups < 4) {
1004 exclude = tipc_group_exclude(tsk->group);
1005
1006 first = NULL;
1007
1008 /* Look for a non-congested destination member, if any */
1009 while (1) {
1010 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
1011 &dstcnt, exclude, false))
1012 return -EHOSTUNREACH;
1013 tipc_dest_pop(&dsts, &node, &port);
1014 cong = tipc_group_cong(tsk->group, node, port, blks,
1015 &mbr);
1016 if (!cong)
1017 break;
1018 if (mbr == first)
1019 break;
1020 if (!first)
1021 first = mbr;
1022 }
1023
1024 /* Start over if destination was not in member list */
1025 if (unlikely(!mbr))
1026 continue;
1027
1028 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1029 break;
1030
1031 /* Block or return if destination link or member is congested */
1032 rc = tipc_wait_for_cond(sock, &timeout,
1033 !tipc_dest_find(cong_links, node, 0) &&
1034 tsk->group &&
1035 !tipc_group_cong(tsk->group, node, port,
1036 blks, &mbr));
1037 if (unlikely(rc))
1038 return rc;
1039
1040 /* Send, unless destination disappeared while waiting */
1041 if (likely(mbr))
1042 break;
1043 }
1044
1045 if (unlikely(lookups >= 4))
1046 return -EHOSTUNREACH;
1047
1048 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1049
1050 return rc ? rc : dlen;
1051}
1052
1053/**
1054 * tipc_send_group_bcast - send message to all members in communication group
1055 * @sock: socket structure
1056 * @m: message to send
1057 * @dlen: total length of message data
1058 * @timeout: timeout to wait for wakeup
1059 *
1060 * Called from function tipc_sendmsg(), which has done all sanity checks
1061 * Returns the number of bytes sent on success, or errno
1062 */
1063static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1064 int dlen, long timeout)
1065{
1066 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1067 struct sock *sk = sock->sk;
1068 struct net *net = sock_net(sk);
1069 struct tipc_sock *tsk = tipc_sk(sk);
1070 struct tipc_nlist *dsts;
1071 struct tipc_mc_method *method = &tsk->mc_method;
1072 bool ack = method->mandatory && method->rcast;
1073 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1074 struct tipc_msg *hdr = &tsk->phdr;
1075 int mtu = tipc_bcast_get_mtu(net);
1076 struct sk_buff_head pkts;
1077 int rc = -EHOSTUNREACH;
1078
1079 /* Block or return if any destination link or member is congested */
1080 rc = tipc_wait_for_cond(sock, &timeout,
1081 !tsk->cong_link_cnt && tsk->group &&
1082 !tipc_group_bc_cong(tsk->group, blks));
1083 if (unlikely(rc))
1084 return rc;
1085
1086 dsts = tipc_group_dests(tsk->group);
1087 if (!dsts->local && !dsts->remote)
1088 return -EHOSTUNREACH;
1089
1090 /* Complete message header */
1091 if (dest) {
1092 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1093 msg_set_nameinst(hdr, dest->addr.name.name.instance);
1094 } else {
1095 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1096 msg_set_nameinst(hdr, 0);
1097 }
1098 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1099 msg_set_destport(hdr, 0);
1100 msg_set_destnode(hdr, 0);
1101 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1102
1103 /* Avoid getting stuck with repeated forced replicasts */
1104 msg_set_grp_bc_ack_req(hdr, ack);
1105
1106 /* Build message as chain of buffers */
1107 __skb_queue_head_init(&pkts);
1108 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1109 if (unlikely(rc != dlen))
1110 return rc;
1111
1112 /* Send message */
1113 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1114 if (unlikely(rc))
1115 return rc;
1116
1117 /* Update broadcast sequence number and send windows */
1118 tipc_group_update_bc_members(tsk->group, blks, ack);
1119
1120 /* Broadcast link is now free to choose method for next broadcast */
1121 method->mandatory = false;
1122 method->expires = jiffies;
1123
1124 return dlen;
1125}
1126
1127/**
1128 * tipc_send_group_mcast - send message to all members with given identity
1129 * @sock: socket structure
1130 * @m: message to send
1131 * @dlen: total length of message data
1132 * @timeout: timeout to wait for wakeup
1133 *
1134 * Called from function tipc_sendmsg(), which has done all sanity checks
1135 * Returns the number of bytes sent on success, or errno
1136 */
1137static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1138 int dlen, long timeout)
1139{
1140 struct sock *sk = sock->sk;
1141 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1142 struct tipc_sock *tsk = tipc_sk(sk);
1143 struct tipc_group *grp = tsk->group;
1144 struct tipc_msg *hdr = &tsk->phdr;
1145 struct net *net = sock_net(sk);
1146 u32 type, inst, scope, exclude;
1147 struct list_head dsts;
1148 u32 dstcnt;
1149
1150 INIT_LIST_HEAD(&dsts);
1151
1152 type = msg_nametype(hdr);
1153 inst = dest->addr.name.name.instance;
1154 scope = msg_lookup_scope(hdr);
1155 exclude = tipc_group_exclude(grp);
1156
1157 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
1158 &dstcnt, exclude, true))
1159 return -EHOSTUNREACH;
1160
1161 if (dstcnt == 1) {
1162 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
1163 return tipc_send_group_unicast(sock, m, dlen, timeout);
1164 }
1165
1166 tipc_dest_list_purge(&dsts);
1167 return tipc_send_group_bcast(sock, m, dlen, timeout);
1168}
1169
1170/**
1171 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1172 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1173 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1174 *
1175 * Multi-threaded: parallel calls with reference to same queues may occur
1176 */
1177void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1178 struct sk_buff_head *inputq)
1179{
1180 u32 self = tipc_own_addr(net);
1181 u32 type, lower, upper, scope;
1182 struct sk_buff *skb, *_skb;
1183 u32 portid, onode;
1184 struct sk_buff_head tmpq;
1185 struct list_head dports;
1186 struct tipc_msg *hdr;
1187 int user, mtyp, hlen;
1188 bool exact;
1189
1190 __skb_queue_head_init(&tmpq);
1191 INIT_LIST_HEAD(&dports);
1192
1193 skb = tipc_skb_peek(arrvq, &inputq->lock);
1194 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1195 hdr = buf_msg(skb);
1196 user = msg_user(hdr);
1197 mtyp = msg_type(hdr);
1198 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1199 onode = msg_orignode(hdr);
1200 type = msg_nametype(hdr);
1201
1202 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1203 spin_lock_bh(&inputq->lock);
1204 if (skb_peek(arrvq) == skb) {
1205 __skb_dequeue(arrvq);
1206 __skb_queue_tail(inputq, skb);
1207 }
1208 kfree_skb(skb);
1209 spin_unlock_bh(&inputq->lock);
1210 continue;
1211 }
1212
1213 /* Group messages require exact scope match */
1214 if (msg_in_group(hdr)) {
1215 lower = 0;
1216 upper = ~0;
1217 scope = msg_lookup_scope(hdr);
1218 exact = true;
1219 } else {
1220 /* TIPC_NODE_SCOPE means "any scope" in this context */
1221 if (onode == self)
1222 scope = TIPC_NODE_SCOPE;
1223 else
1224 scope = TIPC_CLUSTER_SCOPE;
1225 exact = false;
1226 lower = msg_namelower(hdr);
1227 upper = msg_nameupper(hdr);
1228 }
1229
1230 /* Create destination port list: */
1231 tipc_nametbl_mc_lookup(net, type, lower, upper,
1232 scope, exact, &dports);
1233
1234 /* Clone message per destination */
1235 while (tipc_dest_pop(&dports, NULL, &portid)) {
1236 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1237 if (_skb) {
1238 msg_set_destport(buf_msg(_skb), portid);
1239 __skb_queue_tail(&tmpq, _skb);
1240 continue;
1241 }
1242 pr_warn("Failed to clone mcast rcv buffer\n");
1243 }
1244 /* Append to inputq if not already done by other thread */
1245 spin_lock_bh(&inputq->lock);
1246 if (skb_peek(arrvq) == skb) {
1247 skb_queue_splice_tail_init(&tmpq, inputq);
1248 kfree_skb(__skb_dequeue(arrvq));
1249 }
1250 spin_unlock_bh(&inputq->lock);
1251 __skb_queue_purge(&tmpq);
1252 kfree_skb(skb);
1253 }
1254 tipc_sk_rcv(net, inputq);
1255}
1256
1257/* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1258 * when socket is in Nagle mode
1259 */
1260static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1261{
1262 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1263 struct sk_buff *skb = skb_peek_tail(txq);
1264 struct net *net = sock_net(&tsk->sk);
1265 u32 dnode = tsk_peer_node(tsk);
1266 int rc;
1267
1268 if (nagle_ack) {
1269 tsk->pkt_cnt += skb_queue_len(txq);
1270 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1271 tsk->oneway = 0;
1272 if (tsk->nagle_start < NAGLE_START_MAX)
1273 tsk->nagle_start *= 2;
1274 tsk->expect_ack = false;
1275 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1276 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1277 tsk->nagle_start);
1278 } else {
1279 tsk->nagle_start = NAGLE_START_INIT;
1280 if (skb) {
1281 msg_set_ack_required(buf_msg(skb));
1282 tsk->expect_ack = true;
1283 } else {
1284 tsk->expect_ack = false;
1285 }
1286 }
1287 tsk->msg_acc = 0;
1288 tsk->pkt_cnt = 0;
1289 }
1290
1291 if (!skb || tsk->cong_link_cnt)
1292 return;
1293
1294 /* Do not send SYN again after congestion */
1295 if (msg_is_syn(buf_msg(skb)))
1296 return;
1297
1298 if (tsk->msg_acc)
1299 tsk->pkt_cnt += skb_queue_len(txq);
1300 tsk->snt_unacked += tsk->snd_backlog;
1301 tsk->snd_backlog = 0;
1302 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1303 if (rc == -ELINKCONG)
1304 tsk->cong_link_cnt = 1;
1305}
1306
1307/**
1308 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1309 * @tsk: receiving socket
1310 * @skb: pointer to message buffer.
1311 */
1312static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1313 struct sk_buff_head *inputq,
1314 struct sk_buff_head *xmitq)
1315{
1316 struct tipc_msg *hdr = buf_msg(skb);
1317 u32 onode = tsk_own_node(tsk);
1318 struct sock *sk = &tsk->sk;
1319 int mtyp = msg_type(hdr);
1320 bool was_cong;
1321
1322 /* Ignore if connection cannot be validated: */
1323 if (!tsk_peer_msg(tsk, hdr)) {
1324 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1325 goto exit;
1326 }
1327
1328 if (unlikely(msg_errcode(hdr))) {
1329 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1330 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1331 tsk_peer_port(tsk));
1332 sk->sk_state_change(sk);
1333
1334 /* State change is ignored if socket already awake,
1335 * - convert msg to abort msg and add to inqueue
1336 */
1337 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1338 msg_set_type(hdr, TIPC_CONN_MSG);
1339 msg_set_size(hdr, BASIC_H_SIZE);
1340 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1341 __skb_queue_tail(inputq, skb);
1342 return;
1343 }
1344
1345 tsk->probe_unacked = false;
1346
1347 if (mtyp == CONN_PROBE) {
1348 msg_set_type(hdr, CONN_PROBE_REPLY);
1349 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1350 __skb_queue_tail(xmitq, skb);
1351 return;
1352 } else if (mtyp == CONN_ACK) {
1353 was_cong = tsk_conn_cong(tsk);
1354 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1355 tsk->snt_unacked -= msg_conn_ack(hdr);
1356 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1357 tsk->snd_win = msg_adv_win(hdr);
1358 if (was_cong && !tsk_conn_cong(tsk))
1359 sk->sk_write_space(sk);
1360 } else if (mtyp != CONN_PROBE_REPLY) {
1361 pr_warn("Received unknown CONN_PROTO msg\n");
1362 }
1363exit:
1364 kfree_skb(skb);
1365}
1366
1367/**
1368 * tipc_sendmsg - send message in connectionless manner
1369 * @sock: socket structure
1370 * @m: message to send
1371 * @dsz: amount of user data to be sent
1372 *
1373 * Message must have an destination specified explicitly.
1374 * Used for SOCK_RDM and SOCK_DGRAM messages,
1375 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1376 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1377 *
1378 * Returns the number of bytes sent on success, or errno otherwise
1379 */
1380static int tipc_sendmsg(struct socket *sock,
1381 struct msghdr *m, size_t dsz)
1382{
1383 struct sock *sk = sock->sk;
1384 int ret;
1385
1386 lock_sock(sk);
1387 ret = __tipc_sendmsg(sock, m, dsz);
1388 release_sock(sk);
1389
1390 return ret;
1391}
1392
1393static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1394{
1395 struct sock *sk = sock->sk;
1396 struct net *net = sock_net(sk);
1397 struct tipc_sock *tsk = tipc_sk(sk);
1398 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1399 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1400 struct list_head *clinks = &tsk->cong_links;
1401 bool syn = !tipc_sk_type_connectionless(sk);
1402 struct tipc_group *grp = tsk->group;
1403 struct tipc_msg *hdr = &tsk->phdr;
1404 struct tipc_name_seq *seq;
1405 struct sk_buff_head pkts;
1406 u32 dport = 0, dnode = 0;
1407 u32 type = 0, inst = 0;
1408 int mtu, rc;
1409
1410 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1411 return -EMSGSIZE;
1412
1413 if (likely(dest)) {
1414 if (unlikely(m->msg_namelen < sizeof(*dest)))
1415 return -EINVAL;
1416 if (unlikely(dest->family != AF_TIPC))
1417 return -EINVAL;
1418 }
1419
1420 if (grp) {
1421 if (!dest)
1422 return tipc_send_group_bcast(sock, m, dlen, timeout);
1423 if (dest->addrtype == TIPC_ADDR_NAME)
1424 return tipc_send_group_anycast(sock, m, dlen, timeout);
1425 if (dest->addrtype == TIPC_ADDR_ID)
1426 return tipc_send_group_unicast(sock, m, dlen, timeout);
1427 if (dest->addrtype == TIPC_ADDR_MCAST)
1428 return tipc_send_group_mcast(sock, m, dlen, timeout);
1429 return -EINVAL;
1430 }
1431
1432 if (unlikely(!dest)) {
1433 dest = &tsk->peer;
1434 if (!syn && dest->family != AF_TIPC)
1435 return -EDESTADDRREQ;
1436 }
1437
1438 if (unlikely(syn)) {
1439 if (sk->sk_state == TIPC_LISTEN)
1440 return -EPIPE;
1441 if (sk->sk_state != TIPC_OPEN)
1442 return -EISCONN;
1443 if (tsk->published)
1444 return -EOPNOTSUPP;
1445 if (dest->addrtype == TIPC_ADDR_NAME) {
1446 tsk->conn_type = dest->addr.name.name.type;
1447 tsk->conn_instance = dest->addr.name.name.instance;
1448 }
1449 msg_set_syn(hdr, 1);
1450 }
1451
1452 seq = &dest->addr.nameseq;
1453 if (dest->addrtype == TIPC_ADDR_MCAST)
1454 return tipc_sendmcast(sock, seq, m, dlen, timeout);
1455
1456 if (dest->addrtype == TIPC_ADDR_NAME) {
1457 type = dest->addr.name.name.type;
1458 inst = dest->addr.name.name.instance;
1459 dnode = dest->addr.name.domain;
1460 dport = tipc_nametbl_translate(net, type, inst, &dnode);
1461 if (unlikely(!dport && !dnode))
1462 return -EHOSTUNREACH;
1463 } else if (dest->addrtype == TIPC_ADDR_ID) {
1464 dnode = dest->addr.id.node;
1465 } else {
1466 return -EINVAL;
1467 }
1468
1469 /* Block or return if destination link is congested */
1470 rc = tipc_wait_for_cond(sock, &timeout,
1471 !tipc_dest_find(clinks, dnode, 0));
1472 if (unlikely(rc))
1473 return rc;
1474
1475 if (dest->addrtype == TIPC_ADDR_NAME) {
1476 msg_set_type(hdr, TIPC_NAMED_MSG);
1477 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1478 msg_set_nametype(hdr, type);
1479 msg_set_nameinst(hdr, inst);
1480 msg_set_lookup_scope(hdr, tipc_node2scope(dnode));
1481 msg_set_destnode(hdr, dnode);
1482 msg_set_destport(hdr, dport);
1483 } else { /* TIPC_ADDR_ID */
1484 msg_set_type(hdr, TIPC_DIRECT_MSG);
1485 msg_set_lookup_scope(hdr, 0);
1486 msg_set_destnode(hdr, dnode);
1487 msg_set_destport(hdr, dest->addr.id.ref);
1488 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1489 }
1490
1491 __skb_queue_head_init(&pkts);
1492 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, true);
1493 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1494 if (unlikely(rc != dlen))
1495 return rc;
1496 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1497 __skb_queue_purge(&pkts);
1498 return -ENOMEM;
1499 }
1500
1501 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1502 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1503 if (unlikely(rc == -ELINKCONG)) {
1504 tipc_dest_push(clinks, dnode, 0);
1505 tsk->cong_link_cnt++;
1506 rc = 0;
1507 }
1508
1509 if (unlikely(syn && !rc))
1510 tipc_set_sk_state(sk, TIPC_CONNECTING);
1511
1512 return rc ? rc : dlen;
1513}
1514
1515/**
1516 * tipc_sendstream - send stream-oriented data
1517 * @sock: socket structure
1518 * @m: data to send
1519 * @dsz: total length of data to be transmitted
1520 *
1521 * Used for SOCK_STREAM data.
1522 *
1523 * Returns the number of bytes sent on success (or partial success),
1524 * or errno if no data sent
1525 */
1526static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1527{
1528 struct sock *sk = sock->sk;
1529 int ret;
1530
1531 lock_sock(sk);
1532 ret = __tipc_sendstream(sock, m, dsz);
1533 release_sock(sk);
1534
1535 return ret;
1536}
1537
1538static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1539{
1540 struct sock *sk = sock->sk;
1541 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1542 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1543 struct sk_buff_head *txq = &sk->sk_write_queue;
1544 struct tipc_sock *tsk = tipc_sk(sk);
1545 struct tipc_msg *hdr = &tsk->phdr;
1546 struct net *net = sock_net(sk);
1547 struct sk_buff *skb;
1548 u32 dnode = tsk_peer_node(tsk);
1549 int maxnagle = tsk->maxnagle;
1550 int maxpkt = tsk->max_pkt;
1551 int send, sent = 0;
1552 int blocks, rc = 0;
1553
1554 if (unlikely(dlen > INT_MAX))
1555 return -EMSGSIZE;
1556
1557 /* Handle implicit connection setup */
1558 if (unlikely(dest)) {
1559 rc = __tipc_sendmsg(sock, m, dlen);
1560 if (dlen && dlen == rc) {
1561 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1562 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1563 }
1564 return rc;
1565 }
1566
1567 do {
1568 rc = tipc_wait_for_cond(sock, &timeout,
1569 (!tsk->cong_link_cnt &&
1570 !tsk_conn_cong(tsk) &&
1571 tipc_sk_connected(sk)));
1572 if (unlikely(rc))
1573 break;
1574 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1575 blocks = tsk->snd_backlog;
1576 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1577 send <= maxnagle) {
1578 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1579 if (unlikely(rc < 0))
1580 break;
1581 blocks += rc;
1582 tsk->msg_acc++;
1583 if (blocks <= 64 && tsk->expect_ack) {
1584 tsk->snd_backlog = blocks;
1585 sent += send;
1586 break;
1587 } else if (blocks > 64) {
1588 tsk->pkt_cnt += skb_queue_len(txq);
1589 } else {
1590 skb = skb_peek_tail(txq);
1591 if (skb) {
1592 msg_set_ack_required(buf_msg(skb));
1593 tsk->expect_ack = true;
1594 } else {
1595 tsk->expect_ack = false;
1596 }
1597 tsk->msg_acc = 0;
1598 tsk->pkt_cnt = 0;
1599 }
1600 } else {
1601 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1602 if (unlikely(rc != send))
1603 break;
1604 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1605 }
1606 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1607 TIPC_DUMP_SK_SNDQ, " ");
1608 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1609 if (unlikely(rc == -ELINKCONG)) {
1610 tsk->cong_link_cnt = 1;
1611 rc = 0;
1612 }
1613 if (likely(!rc)) {
1614 tsk->snt_unacked += blocks;
1615 tsk->snd_backlog = 0;
1616 sent += send;
1617 }
1618 } while (sent < dlen && !rc);
1619
1620 return sent ? sent : rc;
1621}
1622
1623/**
1624 * tipc_send_packet - send a connection-oriented message
1625 * @sock: socket structure
1626 * @m: message to send
1627 * @dsz: length of data to be transmitted
1628 *
1629 * Used for SOCK_SEQPACKET messages.
1630 *
1631 * Returns the number of bytes sent on success, or errno otherwise
1632 */
1633static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1634{
1635 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1636 return -EMSGSIZE;
1637
1638 return tipc_sendstream(sock, m, dsz);
1639}
1640
1641/* tipc_sk_finish_conn - complete the setup of a connection
1642 */
1643static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1644 u32 peer_node)
1645{
1646 struct sock *sk = &tsk->sk;
1647 struct net *net = sock_net(sk);
1648 struct tipc_msg *msg = &tsk->phdr;
1649
1650 msg_set_syn(msg, 0);
1651 msg_set_destnode(msg, peer_node);
1652 msg_set_destport(msg, peer_port);
1653 msg_set_type(msg, TIPC_CONN_MSG);
1654 msg_set_lookup_scope(msg, 0);
1655 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1656
1657 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1658 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1659 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1660 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1661 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1662 tsk_set_nagle(tsk);
1663 __skb_queue_purge(&sk->sk_write_queue);
1664 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1665 return;
1666
1667 /* Fall back to message based flow control */
1668 tsk->rcv_win = FLOWCTL_MSG_WIN;
1669 tsk->snd_win = FLOWCTL_MSG_WIN;
1670}
1671
1672/**
1673 * tipc_sk_set_orig_addr - capture sender's address for received message
1674 * @m: descriptor for message info
1675 * @skb: received message
1676 *
1677 * Note: Address is not captured if not requested by receiver.
1678 */
1679static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1680{
1681 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1682 struct tipc_msg *hdr = buf_msg(skb);
1683
1684 if (!srcaddr)
1685 return;
1686
1687 srcaddr->sock.family = AF_TIPC;
1688 srcaddr->sock.addrtype = TIPC_ADDR_ID;
1689 srcaddr->sock.scope = 0;
1690 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1691 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1692 srcaddr->sock.addr.name.domain = 0;
1693 m->msg_namelen = sizeof(struct sockaddr_tipc);
1694
1695 if (!msg_in_group(hdr))
1696 return;
1697
1698 /* Group message users may also want to know sending member's id */
1699 srcaddr->member.family = AF_TIPC;
1700 srcaddr->member.addrtype = TIPC_ADDR_NAME;
1701 srcaddr->member.scope = 0;
1702 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1703 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1704 srcaddr->member.addr.name.domain = 0;
1705 m->msg_namelen = sizeof(*srcaddr);
1706}
1707
1708/**
1709 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1710 * @m: descriptor for message info
1711 * @skb: received message buffer
1712 * @tsk: TIPC port associated with message
1713 *
1714 * Note: Ancillary data is not captured if not requested by receiver.
1715 *
1716 * Returns 0 if successful, otherwise errno
1717 */
1718static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1719 struct tipc_sock *tsk)
1720{
1721 struct tipc_msg *msg;
1722 u32 anc_data[3];
1723 u32 err;
1724 u32 dest_type;
1725 int has_name;
1726 int res;
1727
1728 if (likely(m->msg_controllen == 0))
1729 return 0;
1730 msg = buf_msg(skb);
1731
1732 /* Optionally capture errored message object(s) */
1733 err = msg ? msg_errcode(msg) : 0;
1734 if (unlikely(err)) {
1735 anc_data[0] = err;
1736 anc_data[1] = msg_data_sz(msg);
1737 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1738 if (res)
1739 return res;
1740 if (anc_data[1]) {
1741 if (skb_linearize(skb))
1742 return -ENOMEM;
1743 msg = buf_msg(skb);
1744 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1745 msg_data(msg));
1746 if (res)
1747 return res;
1748 }
1749 }
1750
1751 /* Optionally capture message destination object */
1752 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1753 switch (dest_type) {
1754 case TIPC_NAMED_MSG:
1755 has_name = 1;
1756 anc_data[0] = msg_nametype(msg);
1757 anc_data[1] = msg_namelower(msg);
1758 anc_data[2] = msg_namelower(msg);
1759 break;
1760 case TIPC_MCAST_MSG:
1761 has_name = 1;
1762 anc_data[0] = msg_nametype(msg);
1763 anc_data[1] = msg_namelower(msg);
1764 anc_data[2] = msg_nameupper(msg);
1765 break;
1766 case TIPC_CONN_MSG:
1767 has_name = (tsk->conn_type != 0);
1768 anc_data[0] = tsk->conn_type;
1769 anc_data[1] = tsk->conn_instance;
1770 anc_data[2] = tsk->conn_instance;
1771 break;
1772 default:
1773 has_name = 0;
1774 }
1775 if (has_name) {
1776 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1777 if (res)
1778 return res;
1779 }
1780
1781 return 0;
1782}
1783
1784static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1785{
1786 struct sock *sk = &tsk->sk;
1787 struct sk_buff *skb = NULL;
1788 struct tipc_msg *msg;
1789 u32 peer_port = tsk_peer_port(tsk);
1790 u32 dnode = tsk_peer_node(tsk);
1791
1792 if (!tipc_sk_connected(sk))
1793 return NULL;
1794 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1795 dnode, tsk_own_node(tsk), peer_port,
1796 tsk->portid, TIPC_OK);
1797 if (!skb)
1798 return NULL;
1799 msg = buf_msg(skb);
1800 msg_set_conn_ack(msg, tsk->rcv_unacked);
1801 tsk->rcv_unacked = 0;
1802
1803 /* Adjust to and advertize the correct window limit */
1804 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1805 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1806 msg_set_adv_win(msg, tsk->rcv_win);
1807 }
1808 return skb;
1809}
1810
1811static void tipc_sk_send_ack(struct tipc_sock *tsk)
1812{
1813 struct sk_buff *skb;
1814
1815 skb = tipc_sk_build_ack(tsk);
1816 if (!skb)
1817 return;
1818
1819 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1820 msg_link_selector(buf_msg(skb)));
1821}
1822
1823static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1824{
1825 struct sock *sk = sock->sk;
1826 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1827 long timeo = *timeop;
1828 int err = sock_error(sk);
1829
1830 if (err)
1831 return err;
1832
1833 for (;;) {
1834 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1835 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1836 err = -ENOTCONN;
1837 break;
1838 }
1839 add_wait_queue(sk_sleep(sk), &wait);
1840 release_sock(sk);
1841 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1842 sched_annotate_sleep();
1843 lock_sock(sk);
1844 remove_wait_queue(sk_sleep(sk), &wait);
1845 }
1846 err = 0;
1847 if (!skb_queue_empty(&sk->sk_receive_queue))
1848 break;
1849 err = -EAGAIN;
1850 if (!timeo)
1851 break;
1852 err = sock_intr_errno(timeo);
1853 if (signal_pending(current))
1854 break;
1855
1856 err = sock_error(sk);
1857 if (err)
1858 break;
1859 }
1860 *timeop = timeo;
1861 return err;
1862}
1863
1864/**
1865 * tipc_recvmsg - receive packet-oriented message
1866 * @m: descriptor for message info
1867 * @buflen: length of user buffer area
1868 * @flags: receive flags
1869 *
1870 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1871 * If the complete message doesn't fit in user area, truncate it.
1872 *
1873 * Returns size of returned message data, errno otherwise
1874 */
1875static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1876 size_t buflen, int flags)
1877{
1878 struct sock *sk = sock->sk;
1879 bool connected = !tipc_sk_type_connectionless(sk);
1880 struct tipc_sock *tsk = tipc_sk(sk);
1881 int rc, err, hlen, dlen, copy;
1882 struct sk_buff_head xmitq;
1883 struct tipc_msg *hdr;
1884 struct sk_buff *skb;
1885 bool grp_evt;
1886 long timeout;
1887
1888 /* Catch invalid receive requests */
1889 if (unlikely(!buflen))
1890 return -EINVAL;
1891
1892 lock_sock(sk);
1893 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1894 rc = -ENOTCONN;
1895 goto exit;
1896 }
1897 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1898
1899 /* Step rcv queue to first msg with data or error; wait if necessary */
1900 do {
1901 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1902 if (unlikely(rc))
1903 goto exit;
1904 skb = skb_peek(&sk->sk_receive_queue);
1905 hdr = buf_msg(skb);
1906 dlen = msg_data_sz(hdr);
1907 hlen = msg_hdr_sz(hdr);
1908 err = msg_errcode(hdr);
1909 grp_evt = msg_is_grp_evt(hdr);
1910 if (likely(dlen || err))
1911 break;
1912 tsk_advance_rx_queue(sk);
1913 } while (1);
1914
1915 /* Collect msg meta data, including error code and rejected data */
1916 tipc_sk_set_orig_addr(m, skb);
1917 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1918 if (unlikely(rc))
1919 goto exit;
1920 hdr = buf_msg(skb);
1921
1922 /* Capture data if non-error msg, otherwise just set return value */
1923 if (likely(!err)) {
1924 copy = min_t(int, dlen, buflen);
1925 if (unlikely(copy != dlen))
1926 m->msg_flags |= MSG_TRUNC;
1927 rc = skb_copy_datagram_msg(skb, hlen, m, copy);
1928 } else {
1929 copy = 0;
1930 rc = 0;
1931 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
1932 rc = -ECONNRESET;
1933 }
1934 if (unlikely(rc))
1935 goto exit;
1936
1937 /* Mark message as group event if applicable */
1938 if (unlikely(grp_evt)) {
1939 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1940 m->msg_flags |= MSG_EOR;
1941 m->msg_flags |= MSG_OOB;
1942 copy = 0;
1943 }
1944
1945 /* Caption of data or error code/rejected data was successful */
1946 if (unlikely(flags & MSG_PEEK))
1947 goto exit;
1948
1949 /* Send group flow control advertisement when applicable */
1950 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1951 __skb_queue_head_init(&xmitq);
1952 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1953 msg_orignode(hdr), msg_origport(hdr),
1954 &xmitq);
1955 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1956 }
1957
1958 tsk_advance_rx_queue(sk);
1959
1960 if (likely(!connected))
1961 goto exit;
1962
1963 /* Send connection flow control advertisement when applicable */
1964 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1965 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1966 tipc_sk_send_ack(tsk);
1967exit:
1968 release_sock(sk);
1969 return rc ? rc : copy;
1970}
1971
1972/**
1973 * tipc_recvstream - receive stream-oriented data
1974 * @m: descriptor for message info
1975 * @buflen: total size of user buffer area
1976 * @flags: receive flags
1977 *
1978 * Used for SOCK_STREAM messages only. If not enough data is available
1979 * will optionally wait for more; never truncates data.
1980 *
1981 * Returns size of returned message data, errno otherwise
1982 */
1983static int tipc_recvstream(struct socket *sock, struct msghdr *m,
1984 size_t buflen, int flags)
1985{
1986 struct sock *sk = sock->sk;
1987 struct tipc_sock *tsk = tipc_sk(sk);
1988 struct sk_buff *skb;
1989 struct tipc_msg *hdr;
1990 struct tipc_skb_cb *skb_cb;
1991 bool peek = flags & MSG_PEEK;
1992 int offset, required, copy, copied = 0;
1993 int hlen, dlen, err, rc;
1994 long timeout;
1995
1996 /* Catch invalid receive attempts */
1997 if (unlikely(!buflen))
1998 return -EINVAL;
1999
2000 lock_sock(sk);
2001
2002 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2003 rc = -ENOTCONN;
2004 goto exit;
2005 }
2006 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2007 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2008
2009 do {
2010 /* Look at first msg in receive queue; wait if necessary */
2011 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2012 if (unlikely(rc))
2013 break;
2014 skb = skb_peek(&sk->sk_receive_queue);
2015 skb_cb = TIPC_SKB_CB(skb);
2016 hdr = buf_msg(skb);
2017 dlen = msg_data_sz(hdr);
2018 hlen = msg_hdr_sz(hdr);
2019 err = msg_errcode(hdr);
2020
2021 /* Discard any empty non-errored (SYN-) message */
2022 if (unlikely(!dlen && !err)) {
2023 tsk_advance_rx_queue(sk);
2024 continue;
2025 }
2026
2027 /* Collect msg meta data, incl. error code and rejected data */
2028 if (!copied) {
2029 tipc_sk_set_orig_addr(m, skb);
2030 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2031 if (rc)
2032 break;
2033 hdr = buf_msg(skb);
2034 }
2035
2036 /* Copy data if msg ok, otherwise return error/partial data */
2037 if (likely(!err)) {
2038 offset = skb_cb->bytes_read;
2039 copy = min_t(int, dlen - offset, buflen - copied);
2040 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2041 if (unlikely(rc))
2042 break;
2043 copied += copy;
2044 offset += copy;
2045 if (unlikely(offset < dlen)) {
2046 if (!peek)
2047 skb_cb->bytes_read = offset;
2048 break;
2049 }
2050 } else {
2051 rc = 0;
2052 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2053 rc = -ECONNRESET;
2054 if (copied || rc)
2055 break;
2056 }
2057
2058 if (unlikely(peek))
2059 break;
2060
2061 tsk_advance_rx_queue(sk);
2062
2063 /* Send connection flow control advertisement when applicable */
2064 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2065 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2066 tipc_sk_send_ack(tsk);
2067
2068 /* Exit if all requested data or FIN/error received */
2069 if (copied == buflen || err)
2070 break;
2071
2072 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2073exit:
2074 release_sock(sk);
2075 return copied ? copied : rc;
2076}
2077
2078/**
2079 * tipc_write_space - wake up thread if port congestion is released
2080 * @sk: socket
2081 */
2082static void tipc_write_space(struct sock *sk)
2083{
2084 struct socket_wq *wq;
2085
2086 rcu_read_lock();
2087 wq = rcu_dereference(sk->sk_wq);
2088 if (skwq_has_sleeper(wq))
2089 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2090 EPOLLWRNORM | EPOLLWRBAND);
2091 rcu_read_unlock();
2092}
2093
2094/**
2095 * tipc_data_ready - wake up threads to indicate messages have been received
2096 * @sk: socket
2097 */
2098static void tipc_data_ready(struct sock *sk)
2099{
2100 struct socket_wq *wq;
2101
2102 rcu_read_lock();
2103 wq = rcu_dereference(sk->sk_wq);
2104 if (skwq_has_sleeper(wq))
2105 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2106 EPOLLRDNORM | EPOLLRDBAND);
2107 rcu_read_unlock();
2108}
2109
2110static void tipc_sock_destruct(struct sock *sk)
2111{
2112 __skb_queue_purge(&sk->sk_receive_queue);
2113}
2114
2115static void tipc_sk_proto_rcv(struct sock *sk,
2116 struct sk_buff_head *inputq,
2117 struct sk_buff_head *xmitq)
2118{
2119 struct sk_buff *skb = __skb_dequeue(inputq);
2120 struct tipc_sock *tsk = tipc_sk(sk);
2121 struct tipc_msg *hdr = buf_msg(skb);
2122 struct tipc_group *grp = tsk->group;
2123 bool wakeup = false;
2124
2125 switch (msg_user(hdr)) {
2126 case CONN_MANAGER:
2127 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2128 return;
2129 case SOCK_WAKEUP:
2130 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2131 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2132 smp_wmb();
2133 tsk->cong_link_cnt--;
2134 wakeup = true;
2135 tipc_sk_push_backlog(tsk, false);
2136 break;
2137 case GROUP_PROTOCOL:
2138 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2139 break;
2140 case TOP_SRV:
2141 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2142 hdr, inputq, xmitq);
2143 break;
2144 default:
2145 break;
2146 }
2147
2148 if (wakeup)
2149 sk->sk_write_space(sk);
2150
2151 kfree_skb(skb);
2152}
2153
2154/**
2155 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2156 * @tsk: TIPC socket
2157 * @skb: pointer to message buffer.
2158 * @xmitq: for Nagle ACK if any
2159 * Returns true if message should be added to receive queue, false otherwise
2160 */
2161static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2162 struct sk_buff_head *xmitq)
2163{
2164 struct sock *sk = &tsk->sk;
2165 struct net *net = sock_net(sk);
2166 struct tipc_msg *hdr = buf_msg(skb);
2167 bool con_msg = msg_connected(hdr);
2168 u32 pport = tsk_peer_port(tsk);
2169 u32 pnode = tsk_peer_node(tsk);
2170 u32 oport = msg_origport(hdr);
2171 u32 onode = msg_orignode(hdr);
2172 int err = msg_errcode(hdr);
2173 unsigned long delay;
2174
2175 if (unlikely(msg_mcast(hdr)))
2176 return false;
2177 tsk->oneway = 0;
2178
2179 switch (sk->sk_state) {
2180 case TIPC_CONNECTING:
2181 /* Setup ACK */
2182 if (likely(con_msg)) {
2183 if (err)
2184 break;
2185 tipc_sk_finish_conn(tsk, oport, onode);
2186 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2187 /* ACK+ message with data is added to receive queue */
2188 if (msg_data_sz(hdr))
2189 return true;
2190 /* Empty ACK-, - wake up sleeping connect() and drop */
2191 sk->sk_state_change(sk);
2192 msg_set_dest_droppable(hdr, 1);
2193 return false;
2194 }
2195 /* Ignore connectionless message if not from listening socket */
2196 if (oport != pport || onode != pnode)
2197 return false;
2198
2199 /* Rejected SYN */
2200 if (err != TIPC_ERR_OVERLOAD)
2201 break;
2202
2203 /* Prepare for new setup attempt if we have a SYN clone */
2204 if (skb_queue_empty(&sk->sk_write_queue))
2205 break;
2206 get_random_bytes(&delay, 2);
2207 delay %= (tsk->conn_timeout / 4);
2208 delay = msecs_to_jiffies(delay + 100);
2209 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2210 return false;
2211 case TIPC_OPEN:
2212 case TIPC_DISCONNECTING:
2213 return false;
2214 case TIPC_LISTEN:
2215 /* Accept only SYN message */
2216 if (!msg_is_syn(hdr) &&
2217 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2218 return false;
2219 if (!con_msg && !err)
2220 return true;
2221 return false;
2222 case TIPC_ESTABLISHED:
2223 if (!skb_queue_empty(&sk->sk_write_queue))
2224 tipc_sk_push_backlog(tsk, false);
2225 /* Accept only connection-based messages sent by peer */
2226 if (likely(con_msg && !err && pport == oport &&
2227 pnode == onode)) {
2228 if (msg_ack_required(hdr)) {
2229 struct sk_buff *skb;
2230
2231 skb = tipc_sk_build_ack(tsk);
2232 if (skb) {
2233 msg_set_nagle_ack(buf_msg(skb));
2234 __skb_queue_tail(xmitq, skb);
2235 }
2236 }
2237 return true;
2238 }
2239 if (!tsk_peer_msg(tsk, hdr))
2240 return false;
2241 if (!err)
2242 return true;
2243 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2244 tipc_node_remove_conn(net, pnode, tsk->portid);
2245 sk->sk_state_change(sk);
2246 return true;
2247 default:
2248 pr_err("Unknown sk_state %u\n", sk->sk_state);
2249 }
2250 /* Abort connection setup attempt */
2251 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2252 sk->sk_err = ECONNREFUSED;
2253 sk->sk_state_change(sk);
2254 return true;
2255}
2256
2257/**
2258 * rcvbuf_limit - get proper overload limit of socket receive queue
2259 * @sk: socket
2260 * @skb: message
2261 *
2262 * For connection oriented messages, irrespective of importance,
2263 * default queue limit is 2 MB.
2264 *
2265 * For connectionless messages, queue limits are based on message
2266 * importance as follows:
2267 *
2268 * TIPC_LOW_IMPORTANCE (2 MB)
2269 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2270 * TIPC_HIGH_IMPORTANCE (8 MB)
2271 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2272 *
2273 * Returns overload limit according to corresponding message importance
2274 */
2275static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2276{
2277 struct tipc_sock *tsk = tipc_sk(sk);
2278 struct tipc_msg *hdr = buf_msg(skb);
2279
2280 if (unlikely(msg_in_group(hdr)))
2281 return READ_ONCE(sk->sk_rcvbuf);
2282
2283 if (unlikely(!msg_connected(hdr)))
2284 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2285
2286 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2287 return READ_ONCE(sk->sk_rcvbuf);
2288
2289 return FLOWCTL_MSG_LIM;
2290}
2291
2292/**
2293 * tipc_sk_filter_rcv - validate incoming message
2294 * @sk: socket
2295 * @skb: pointer to message.
2296 *
2297 * Enqueues message on receive queue if acceptable; optionally handles
2298 * disconnect indication for a connected socket.
2299 *
2300 * Called with socket lock already taken
2301 *
2302 */
2303static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2304 struct sk_buff_head *xmitq)
2305{
2306 bool sk_conn = !tipc_sk_type_connectionless(sk);
2307 struct tipc_sock *tsk = tipc_sk(sk);
2308 struct tipc_group *grp = tsk->group;
2309 struct tipc_msg *hdr = buf_msg(skb);
2310 struct net *net = sock_net(sk);
2311 struct sk_buff_head inputq;
2312 int mtyp = msg_type(hdr);
2313 int limit, err = TIPC_OK;
2314
2315 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2316 TIPC_SKB_CB(skb)->bytes_read = 0;
2317 __skb_queue_head_init(&inputq);
2318 __skb_queue_tail(&inputq, skb);
2319
2320 if (unlikely(!msg_isdata(hdr)))
2321 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2322
2323 if (unlikely(grp))
2324 tipc_group_filter_msg(grp, &inputq, xmitq);
2325
2326 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2327 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2328
2329 /* Validate and add to receive buffer if there is space */
2330 while ((skb = __skb_dequeue(&inputq))) {
2331 hdr = buf_msg(skb);
2332 limit = rcvbuf_limit(sk, skb);
2333 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2334 (!sk_conn && msg_connected(hdr)) ||
2335 (!grp && msg_in_group(hdr)))
2336 err = TIPC_ERR_NO_PORT;
2337 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2338 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2339 "err_overload2!");
2340 atomic_inc(&sk->sk_drops);
2341 err = TIPC_ERR_OVERLOAD;
2342 }
2343
2344 if (unlikely(err)) {
2345 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2346 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2347 "@filter_rcv!");
2348 __skb_queue_tail(xmitq, skb);
2349 }
2350 err = TIPC_OK;
2351 continue;
2352 }
2353 __skb_queue_tail(&sk->sk_receive_queue, skb);
2354 skb_set_owner_r(skb, sk);
2355 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2356 "rcvq >90% allocated!");
2357 sk->sk_data_ready(sk);
2358 }
2359}
2360
2361/**
2362 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2363 * @sk: socket
2364 * @skb: message
2365 *
2366 * Caller must hold socket lock
2367 */
2368static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2369{
2370 unsigned int before = sk_rmem_alloc_get(sk);
2371 struct sk_buff_head xmitq;
2372 unsigned int added;
2373
2374 __skb_queue_head_init(&xmitq);
2375
2376 tipc_sk_filter_rcv(sk, skb, &xmitq);
2377 added = sk_rmem_alloc_get(sk) - before;
2378 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2379
2380 /* Send pending response/rejected messages, if any */
2381 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2382 return 0;
2383}
2384
2385/**
2386 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2387 * inputq and try adding them to socket or backlog queue
2388 * @inputq: list of incoming buffers with potentially different destinations
2389 * @sk: socket where the buffers should be enqueued
2390 * @dport: port number for the socket
2391 *
2392 * Caller must hold socket lock
2393 */
2394static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2395 u32 dport, struct sk_buff_head *xmitq)
2396{
2397 unsigned long time_limit = jiffies + 2;
2398 struct sk_buff *skb;
2399 unsigned int lim;
2400 atomic_t *dcnt;
2401 u32 onode;
2402
2403 while (skb_queue_len(inputq)) {
2404 if (unlikely(time_after_eq(jiffies, time_limit)))
2405 return;
2406
2407 skb = tipc_skb_dequeue(inputq, dport);
2408 if (unlikely(!skb))
2409 return;
2410
2411 /* Add message directly to receive queue if possible */
2412 if (!sock_owned_by_user(sk)) {
2413 tipc_sk_filter_rcv(sk, skb, xmitq);
2414 continue;
2415 }
2416
2417 /* Try backlog, compensating for double-counted bytes */
2418 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2419 if (!sk->sk_backlog.len)
2420 atomic_set(dcnt, 0);
2421 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2422 if (likely(!sk_add_backlog(sk, skb, lim))) {
2423 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2424 "bklg & rcvq >90% allocated!");
2425 continue;
2426 }
2427
2428 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2429 /* Overload => reject message back to sender */
2430 onode = tipc_own_addr(sock_net(sk));
2431 atomic_inc(&sk->sk_drops);
2432 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2433 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2434 "@sk_enqueue!");
2435 __skb_queue_tail(xmitq, skb);
2436 }
2437 break;
2438 }
2439}
2440
2441/**
2442 * tipc_sk_rcv - handle a chain of incoming buffers
2443 * @inputq: buffer list containing the buffers
2444 * Consumes all buffers in list until inputq is empty
2445 * Note: may be called in multiple threads referring to the same queue
2446 */
2447void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2448{
2449 struct sk_buff_head xmitq;
2450 u32 dnode, dport = 0;
2451 int err;
2452 struct tipc_sock *tsk;
2453 struct sock *sk;
2454 struct sk_buff *skb;
2455
2456 __skb_queue_head_init(&xmitq);
2457 while (skb_queue_len(inputq)) {
2458 dport = tipc_skb_peek_port(inputq, dport);
2459 tsk = tipc_sk_lookup(net, dport);
2460
2461 if (likely(tsk)) {
2462 sk = &tsk->sk;
2463 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2464 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2465 spin_unlock_bh(&sk->sk_lock.slock);
2466 }
2467 /* Send pending response/rejected messages, if any */
2468 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2469 sock_put(sk);
2470 continue;
2471 }
2472 /* No destination socket => dequeue skb if still there */
2473 skb = tipc_skb_dequeue(inputq, dport);
2474 if (!skb)
2475 return;
2476
2477 /* Try secondary lookup if unresolved named message */
2478 err = TIPC_ERR_NO_PORT;
2479 if (tipc_msg_lookup_dest(net, skb, &err))
2480 goto xmit;
2481
2482 /* Prepare for message rejection */
2483 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2484 continue;
2485
2486 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2487xmit:
2488 dnode = msg_destnode(buf_msg(skb));
2489 tipc_node_xmit_skb(net, skb, dnode, dport);
2490 }
2491}
2492
2493static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2494{
2495 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2496 struct sock *sk = sock->sk;
2497 int done;
2498
2499 do {
2500 int err = sock_error(sk);
2501 if (err)
2502 return err;
2503 if (!*timeo_p)
2504 return -ETIMEDOUT;
2505 if (signal_pending(current))
2506 return sock_intr_errno(*timeo_p);
2507 if (sk->sk_state == TIPC_DISCONNECTING)
2508 break;
2509
2510 add_wait_queue(sk_sleep(sk), &wait);
2511 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2512 &wait);
2513 remove_wait_queue(sk_sleep(sk), &wait);
2514 } while (!done);
2515 return 0;
2516}
2517
2518static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2519{
2520 if (addr->family != AF_TIPC)
2521 return false;
2522 if (addr->addrtype == TIPC_SERVICE_RANGE)
2523 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2524 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2525 addr->addrtype == TIPC_SOCKET_ADDR);
2526}
2527
2528/**
2529 * tipc_connect - establish a connection to another TIPC port
2530 * @sock: socket structure
2531 * @dest: socket address for destination port
2532 * @destlen: size of socket address data structure
2533 * @flags: file-related flags associated with socket
2534 *
2535 * Returns 0 on success, errno otherwise
2536 */
2537static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2538 int destlen, int flags)
2539{
2540 struct sock *sk = sock->sk;
2541 struct tipc_sock *tsk = tipc_sk(sk);
2542 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2543 struct msghdr m = {NULL,};
2544 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2545 int previous;
2546 int res = 0;
2547
2548 if (destlen != sizeof(struct sockaddr_tipc))
2549 return -EINVAL;
2550
2551 lock_sock(sk);
2552
2553 if (tsk->group) {
2554 res = -EINVAL;
2555 goto exit;
2556 }
2557
2558 if (dst->family == AF_UNSPEC) {
2559 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2560 if (!tipc_sk_type_connectionless(sk))
2561 res = -EINVAL;
2562 goto exit;
2563 }
2564 if (!tipc_sockaddr_is_sane(dst)) {
2565 res = -EINVAL;
2566 goto exit;
2567 }
2568 /* DGRAM/RDM connect(), just save the destaddr */
2569 if (tipc_sk_type_connectionless(sk)) {
2570 memcpy(&tsk->peer, dest, destlen);
2571 goto exit;
2572 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2573 res = -EINVAL;
2574 goto exit;
2575 }
2576
2577 previous = sk->sk_state;
2578
2579 switch (sk->sk_state) {
2580 case TIPC_OPEN:
2581 /* Send a 'SYN-' to destination */
2582 m.msg_name = dest;
2583 m.msg_namelen = destlen;
2584
2585 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2586 * indicate send_msg() is never blocked.
2587 */
2588 if (!timeout)
2589 m.msg_flags = MSG_DONTWAIT;
2590
2591 res = __tipc_sendmsg(sock, &m, 0);
2592 if ((res < 0) && (res != -EWOULDBLOCK))
2593 goto exit;
2594
2595 /* Just entered TIPC_CONNECTING state; the only
2596 * difference is that return value in non-blocking
2597 * case is EINPROGRESS, rather than EALREADY.
2598 */
2599 res = -EINPROGRESS;
2600 fallthrough;
2601 case TIPC_CONNECTING:
2602 if (!timeout) {
2603 if (previous == TIPC_CONNECTING)
2604 res = -EALREADY;
2605 goto exit;
2606 }
2607 timeout = msecs_to_jiffies(timeout);
2608 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2609 res = tipc_wait_for_connect(sock, &timeout);
2610 break;
2611 case TIPC_ESTABLISHED:
2612 res = -EISCONN;
2613 break;
2614 default:
2615 res = -EINVAL;
2616 }
2617
2618exit:
2619 release_sock(sk);
2620 return res;
2621}
2622
2623/**
2624 * tipc_listen - allow socket to listen for incoming connections
2625 * @sock: socket structure
2626 * @len: (unused)
2627 *
2628 * Returns 0 on success, errno otherwise
2629 */
2630static int tipc_listen(struct socket *sock, int len)
2631{
2632 struct sock *sk = sock->sk;
2633 int res;
2634
2635 lock_sock(sk);
2636 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2637 release_sock(sk);
2638
2639 return res;
2640}
2641
2642static int tipc_wait_for_accept(struct socket *sock, long timeo)
2643{
2644 struct sock *sk = sock->sk;
2645 DEFINE_WAIT(wait);
2646 int err;
2647
2648 /* True wake-one mechanism for incoming connections: only
2649 * one process gets woken up, not the 'whole herd'.
2650 * Since we do not 'race & poll' for established sockets
2651 * anymore, the common case will execute the loop only once.
2652 */
2653 for (;;) {
2654 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
2655 TASK_INTERRUPTIBLE);
2656 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2657 release_sock(sk);
2658 timeo = schedule_timeout(timeo);
2659 lock_sock(sk);
2660 }
2661 err = 0;
2662 if (!skb_queue_empty(&sk->sk_receive_queue))
2663 break;
2664 err = -EAGAIN;
2665 if (!timeo)
2666 break;
2667 err = sock_intr_errno(timeo);
2668 if (signal_pending(current))
2669 break;
2670 }
2671 finish_wait(sk_sleep(sk), &wait);
2672 return err;
2673}
2674
2675/**
2676 * tipc_accept - wait for connection request
2677 * @sock: listening socket
2678 * @new_sock: new socket that is to be connected
2679 * @flags: file-related flags associated with socket
2680 *
2681 * Returns 0 on success, errno otherwise
2682 */
2683static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2684 bool kern)
2685{
2686 struct sock *new_sk, *sk = sock->sk;
2687 struct sk_buff *buf;
2688 struct tipc_sock *new_tsock;
2689 struct tipc_msg *msg;
2690 long timeo;
2691 int res;
2692
2693 lock_sock(sk);
2694
2695 if (sk->sk_state != TIPC_LISTEN) {
2696 res = -EINVAL;
2697 goto exit;
2698 }
2699 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2700 res = tipc_wait_for_accept(sock, timeo);
2701 if (res)
2702 goto exit;
2703
2704 buf = skb_peek(&sk->sk_receive_queue);
2705
2706 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2707 if (res)
2708 goto exit;
2709 security_sk_clone(sock->sk, new_sock->sk);
2710
2711 new_sk = new_sock->sk;
2712 new_tsock = tipc_sk(new_sk);
2713 msg = buf_msg(buf);
2714
2715 /* we lock on new_sk; but lockdep sees the lock on sk */
2716 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2717
2718 /*
2719 * Reject any stray messages received by new socket
2720 * before the socket lock was taken (very, very unlikely)
2721 */
2722 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2723
2724 /* Connect new socket to it's peer */
2725 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2726
2727 tsk_set_importance(new_sk, msg_importance(msg));
2728 if (msg_named(msg)) {
2729 new_tsock->conn_type = msg_nametype(msg);
2730 new_tsock->conn_instance = msg_nameinst(msg);
2731 }
2732
2733 /*
2734 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2735 * Respond to 'SYN+' by queuing it on new socket.
2736 */
2737 if (!msg_data_sz(msg)) {
2738 struct msghdr m = {NULL,};
2739
2740 tsk_advance_rx_queue(sk);
2741 __tipc_sendstream(new_sock, &m, 0);
2742 } else {
2743 __skb_dequeue(&sk->sk_receive_queue);
2744 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2745 skb_set_owner_r(buf, new_sk);
2746 }
2747 release_sock(new_sk);
2748exit:
2749 release_sock(sk);
2750 return res;
2751}
2752
2753/**
2754 * tipc_shutdown - shutdown socket connection
2755 * @sock: socket structure
2756 * @how: direction to close (must be SHUT_RDWR)
2757 *
2758 * Terminates connection (if necessary), then purges socket's receive queue.
2759 *
2760 * Returns 0 on success, errno otherwise
2761 */
2762static int tipc_shutdown(struct socket *sock, int how)
2763{
2764 struct sock *sk = sock->sk;
2765 int res;
2766
2767 if (how != SHUT_RDWR)
2768 return -EINVAL;
2769
2770 lock_sock(sk);
2771
2772 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2773 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2774 sk->sk_shutdown = SHUTDOWN_MASK;
2775
2776 if (sk->sk_state == TIPC_DISCONNECTING) {
2777 /* Discard any unreceived messages */
2778 __skb_queue_purge(&sk->sk_receive_queue);
2779
2780 res = 0;
2781 } else {
2782 res = -ENOTCONN;
2783 }
2784 /* Wake up anyone sleeping in poll. */
2785 sk->sk_state_change(sk);
2786
2787 release_sock(sk);
2788 return res;
2789}
2790
2791static void tipc_sk_check_probing_state(struct sock *sk,
2792 struct sk_buff_head *list)
2793{
2794 struct tipc_sock *tsk = tipc_sk(sk);
2795 u32 pnode = tsk_peer_node(tsk);
2796 u32 pport = tsk_peer_port(tsk);
2797 u32 self = tsk_own_node(tsk);
2798 u32 oport = tsk->portid;
2799 struct sk_buff *skb;
2800
2801 if (tsk->probe_unacked) {
2802 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2803 sk->sk_err = ECONNABORTED;
2804 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2805 sk->sk_state_change(sk);
2806 return;
2807 }
2808 /* Prepare new probe */
2809 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2810 pnode, self, pport, oport, TIPC_OK);
2811 if (skb)
2812 __skb_queue_tail(list, skb);
2813 tsk->probe_unacked = true;
2814 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2815}
2816
2817static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2818{
2819 struct tipc_sock *tsk = tipc_sk(sk);
2820
2821 /* Try again later if dest link is congested */
2822 if (tsk->cong_link_cnt) {
2823 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100));
2824 return;
2825 }
2826 /* Prepare SYN for retransmit */
2827 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2828}
2829
2830static void tipc_sk_timeout(struct timer_list *t)
2831{
2832 struct sock *sk = from_timer(sk, t, sk_timer);
2833 struct tipc_sock *tsk = tipc_sk(sk);
2834 u32 pnode = tsk_peer_node(tsk);
2835 struct sk_buff_head list;
2836 int rc = 0;
2837
2838 __skb_queue_head_init(&list);
2839 bh_lock_sock(sk);
2840
2841 /* Try again later if socket is busy */
2842 if (sock_owned_by_user(sk)) {
2843 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2844 bh_unlock_sock(sk);
2845 sock_put(sk);
2846 return;
2847 }
2848
2849 if (sk->sk_state == TIPC_ESTABLISHED)
2850 tipc_sk_check_probing_state(sk, &list);
2851 else if (sk->sk_state == TIPC_CONNECTING)
2852 tipc_sk_retry_connect(sk, &list);
2853
2854 bh_unlock_sock(sk);
2855
2856 if (!skb_queue_empty(&list))
2857 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2858
2859 /* SYN messages may cause link congestion */
2860 if (rc == -ELINKCONG) {
2861 tipc_dest_push(&tsk->cong_links, pnode, 0);
2862 tsk->cong_link_cnt = 1;
2863 }
2864 sock_put(sk);
2865}
2866
2867static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2868 struct tipc_name_seq const *seq)
2869{
2870 struct sock *sk = &tsk->sk;
2871 struct net *net = sock_net(sk);
2872 struct publication *publ;
2873 u32 key;
2874
2875 if (scope != TIPC_NODE_SCOPE)
2876 scope = TIPC_CLUSTER_SCOPE;
2877
2878 if (tipc_sk_connected(sk))
2879 return -EINVAL;
2880 key = tsk->portid + tsk->pub_count + 1;
2881 if (key == tsk->portid)
2882 return -EADDRINUSE;
2883
2884 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2885 scope, tsk->portid, key);
2886 if (unlikely(!publ))
2887 return -EINVAL;
2888
2889 list_add(&publ->binding_sock, &tsk->publications);
2890 tsk->pub_count++;
2891 tsk->published = 1;
2892 return 0;
2893}
2894
2895static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2896 struct tipc_name_seq const *seq)
2897{
2898 struct net *net = sock_net(&tsk->sk);
2899 struct publication *publ;
2900 struct publication *safe;
2901 int rc = -EINVAL;
2902
2903 if (scope != TIPC_NODE_SCOPE)
2904 scope = TIPC_CLUSTER_SCOPE;
2905
2906 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) {
2907 if (seq) {
2908 if (publ->scope != scope)
2909 continue;
2910 if (publ->type != seq->type)
2911 continue;
2912 if (publ->lower != seq->lower)
2913 continue;
2914 if (publ->upper != seq->upper)
2915 break;
2916 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2917 publ->upper, publ->key);
2918 rc = 0;
2919 break;
2920 }
2921 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2922 publ->upper, publ->key);
2923 rc = 0;
2924 }
2925 if (list_empty(&tsk->publications))
2926 tsk->published = 0;
2927 return rc;
2928}
2929
2930/* tipc_sk_reinit: set non-zero address in all existing sockets
2931 * when we go from standalone to network mode.
2932 */
2933void tipc_sk_reinit(struct net *net)
2934{
2935 struct tipc_net *tn = net_generic(net, tipc_net_id);
2936 struct rhashtable_iter iter;
2937 struct tipc_sock *tsk;
2938 struct tipc_msg *msg;
2939
2940 rhashtable_walk_enter(&tn->sk_rht, &iter);
2941
2942 do {
2943 rhashtable_walk_start(&iter);
2944
2945 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2946 sock_hold(&tsk->sk);
2947 rhashtable_walk_stop(&iter);
2948 lock_sock(&tsk->sk);
2949 msg = &tsk->phdr;
2950 msg_set_prevnode(msg, tipc_own_addr(net));
2951 msg_set_orignode(msg, tipc_own_addr(net));
2952 release_sock(&tsk->sk);
2953 rhashtable_walk_start(&iter);
2954 sock_put(&tsk->sk);
2955 }
2956
2957 rhashtable_walk_stop(&iter);
2958 } while (tsk == ERR_PTR(-EAGAIN));
2959
2960 rhashtable_walk_exit(&iter);
2961}
2962
2963static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2964{
2965 struct tipc_net *tn = net_generic(net, tipc_net_id);
2966 struct tipc_sock *tsk;
2967
2968 rcu_read_lock();
2969 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
2970 if (tsk)
2971 sock_hold(&tsk->sk);
2972 rcu_read_unlock();
2973
2974 return tsk;
2975}
2976
2977static int tipc_sk_insert(struct tipc_sock *tsk)
2978{
2979 struct sock *sk = &tsk->sk;
2980 struct net *net = sock_net(sk);
2981 struct tipc_net *tn = net_generic(net, tipc_net_id);
2982 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2983 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2984
2985 while (remaining--) {
2986 portid++;
2987 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2988 portid = TIPC_MIN_PORT;
2989 tsk->portid = portid;
2990 sock_hold(&tsk->sk);
2991 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2992 tsk_rht_params))
2993 return 0;
2994 sock_put(&tsk->sk);
2995 }
2996
2997 return -1;
2998}
2999
3000static void tipc_sk_remove(struct tipc_sock *tsk)
3001{
3002 struct sock *sk = &tsk->sk;
3003 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3004
3005 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3006 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3007 __sock_put(sk);
3008 }
3009}
3010
3011static const struct rhashtable_params tsk_rht_params = {
3012 .nelem_hint = 192,
3013 .head_offset = offsetof(struct tipc_sock, node),
3014 .key_offset = offsetof(struct tipc_sock, portid),
3015 .key_len = sizeof(u32), /* portid */
3016 .max_size = 1048576,
3017 .min_size = 256,
3018 .automatic_shrinking = true,
3019};
3020
3021int tipc_sk_rht_init(struct net *net)
3022{
3023 struct tipc_net *tn = net_generic(net, tipc_net_id);
3024
3025 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3026}
3027
3028void tipc_sk_rht_destroy(struct net *net)
3029{
3030 struct tipc_net *tn = net_generic(net, tipc_net_id);
3031
3032 /* Wait for socket readers to complete */
3033 synchronize_net();
3034
3035 rhashtable_destroy(&tn->sk_rht);
3036}
3037
3038static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3039{
3040 struct net *net = sock_net(&tsk->sk);
3041 struct tipc_group *grp = tsk->group;
3042 struct tipc_msg *hdr = &tsk->phdr;
3043 struct tipc_name_seq seq;
3044 int rc;
3045
3046 if (mreq->type < TIPC_RESERVED_TYPES)
3047 return -EACCES;
3048 if (mreq->scope > TIPC_NODE_SCOPE)
3049 return -EINVAL;
3050 if (grp)
3051 return -EACCES;
3052 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3053 if (!grp)
3054 return -ENOMEM;
3055 tsk->group = grp;
3056 msg_set_lookup_scope(hdr, mreq->scope);
3057 msg_set_nametype(hdr, mreq->type);
3058 msg_set_dest_droppable(hdr, true);
3059 seq.type = mreq->type;
3060 seq.lower = mreq->instance;
3061 seq.upper = seq.lower;
3062 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope);
3063 rc = tipc_sk_publish(tsk, mreq->scope, &seq);
3064 if (rc) {
3065 tipc_group_delete(net, grp);
3066 tsk->group = NULL;
3067 return rc;
3068 }
3069 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3070 tsk->mc_method.rcast = true;
3071 tsk->mc_method.mandatory = true;
3072 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3073 return rc;
3074}
3075
3076static int tipc_sk_leave(struct tipc_sock *tsk)
3077{
3078 struct net *net = sock_net(&tsk->sk);
3079 struct tipc_group *grp = tsk->group;
3080 struct tipc_name_seq seq;
3081 int scope;
3082
3083 if (!grp)
3084 return -EINVAL;
3085 tipc_group_self(grp, &seq, &scope);
3086 tipc_group_delete(net, grp);
3087 tsk->group = NULL;
3088 tipc_sk_withdraw(tsk, scope, &seq);
3089 return 0;
3090}
3091
3092/**
3093 * tipc_setsockopt - set socket option
3094 * @sock: socket structure
3095 * @lvl: option level
3096 * @opt: option identifier
3097 * @ov: pointer to new option value
3098 * @ol: length of option value
3099 *
3100 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3101 * (to ease compatibility).
3102 *
3103 * Returns 0 on success, errno otherwise
3104 */
3105static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3106 sockptr_t ov, unsigned int ol)
3107{
3108 struct sock *sk = sock->sk;
3109 struct tipc_sock *tsk = tipc_sk(sk);
3110 struct tipc_group_req mreq;
3111 u32 value = 0;
3112 int res = 0;
3113
3114 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3115 return 0;
3116 if (lvl != SOL_TIPC)
3117 return -ENOPROTOOPT;
3118
3119 switch (opt) {
3120 case TIPC_IMPORTANCE:
3121 case TIPC_SRC_DROPPABLE:
3122 case TIPC_DEST_DROPPABLE:
3123 case TIPC_CONN_TIMEOUT:
3124 case TIPC_NODELAY:
3125 if (ol < sizeof(value))
3126 return -EINVAL;
3127 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3128 return -EFAULT;
3129 break;
3130 case TIPC_GROUP_JOIN:
3131 if (ol < sizeof(mreq))
3132 return -EINVAL;
3133 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3134 return -EFAULT;
3135 break;
3136 default:
3137 if (!sockptr_is_null(ov) || ol)
3138 return -EINVAL;
3139 }
3140
3141 lock_sock(sk);
3142
3143 switch (opt) {
3144 case TIPC_IMPORTANCE:
3145 res = tsk_set_importance(sk, value);
3146 break;
3147 case TIPC_SRC_DROPPABLE:
3148 if (sock->type != SOCK_STREAM)
3149 tsk_set_unreliable(tsk, value);
3150 else
3151 res = -ENOPROTOOPT;
3152 break;
3153 case TIPC_DEST_DROPPABLE:
3154 tsk_set_unreturnable(tsk, value);
3155 break;
3156 case TIPC_CONN_TIMEOUT:
3157 tipc_sk(sk)->conn_timeout = value;
3158 break;
3159 case TIPC_MCAST_BROADCAST:
3160 tsk->mc_method.rcast = false;
3161 tsk->mc_method.mandatory = true;
3162 break;
3163 case TIPC_MCAST_REPLICAST:
3164 tsk->mc_method.rcast = true;
3165 tsk->mc_method.mandatory = true;
3166 break;
3167 case TIPC_GROUP_JOIN:
3168 res = tipc_sk_join(tsk, &mreq);
3169 break;
3170 case TIPC_GROUP_LEAVE:
3171 res = tipc_sk_leave(tsk);
3172 break;
3173 case TIPC_NODELAY:
3174 tsk->nodelay = !!value;
3175 tsk_set_nagle(tsk);
3176 break;
3177 default:
3178 res = -EINVAL;
3179 }
3180
3181 release_sock(sk);
3182
3183 return res;
3184}
3185
3186/**
3187 * tipc_getsockopt - get socket option
3188 * @sock: socket structure
3189 * @lvl: option level
3190 * @opt: option identifier
3191 * @ov: receptacle for option value
3192 * @ol: receptacle for length of option value
3193 *
3194 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3195 * (to ease compatibility).
3196 *
3197 * Returns 0 on success, errno otherwise
3198 */
3199static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3200 char __user *ov, int __user *ol)
3201{
3202 struct sock *sk = sock->sk;
3203 struct tipc_sock *tsk = tipc_sk(sk);
3204 struct tipc_name_seq seq;
3205 int len, scope;
3206 u32 value;
3207 int res;
3208
3209 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3210 return put_user(0, ol);
3211 if (lvl != SOL_TIPC)
3212 return -ENOPROTOOPT;
3213 res = get_user(len, ol);
3214 if (res)
3215 return res;
3216
3217 lock_sock(sk);
3218
3219 switch (opt) {
3220 case TIPC_IMPORTANCE:
3221 value = tsk_importance(tsk);
3222 break;
3223 case TIPC_SRC_DROPPABLE:
3224 value = tsk_unreliable(tsk);
3225 break;
3226 case TIPC_DEST_DROPPABLE:
3227 value = tsk_unreturnable(tsk);
3228 break;
3229 case TIPC_CONN_TIMEOUT:
3230 value = tsk->conn_timeout;
3231 /* no need to set "res", since already 0 at this point */
3232 break;
3233 case TIPC_NODE_RECVQ_DEPTH:
3234 value = 0; /* was tipc_queue_size, now obsolete */
3235 break;
3236 case TIPC_SOCK_RECVQ_DEPTH:
3237 value = skb_queue_len(&sk->sk_receive_queue);
3238 break;
3239 case TIPC_SOCK_RECVQ_USED:
3240 value = sk_rmem_alloc_get(sk);
3241 break;
3242 case TIPC_GROUP_JOIN:
3243 seq.type = 0;
3244 if (tsk->group)
3245 tipc_group_self(tsk->group, &seq, &scope);
3246 value = seq.type;
3247 break;
3248 default:
3249 res = -EINVAL;
3250 }
3251
3252 release_sock(sk);
3253
3254 if (res)
3255 return res; /* "get" failed */
3256
3257 if (len < sizeof(value))
3258 return -EINVAL;
3259
3260 if (copy_to_user(ov, &value, sizeof(value)))
3261 return -EFAULT;
3262
3263 return put_user(sizeof(value), ol);
3264}
3265
3266static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3267{
3268 struct net *net = sock_net(sock->sk);
3269 struct tipc_sioc_nodeid_req nr = {0};
3270 struct tipc_sioc_ln_req lnr;
3271 void __user *argp = (void __user *)arg;
3272
3273 switch (cmd) {
3274 case SIOCGETLINKNAME:
3275 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3276 return -EFAULT;
3277 if (!tipc_node_get_linkname(net,
3278 lnr.bearer_id & 0xffff, lnr.peer,
3279 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3280 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3281 return -EFAULT;
3282 return 0;
3283 }
3284 return -EADDRNOTAVAIL;
3285 case SIOCGETNODEID:
3286 if (copy_from_user(&nr, argp, sizeof(nr)))
3287 return -EFAULT;
3288 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3289 return -EADDRNOTAVAIL;
3290 if (copy_to_user(argp, &nr, sizeof(nr)))
3291 return -EFAULT;
3292 return 0;
3293 default:
3294 return -ENOIOCTLCMD;
3295 }
3296}
3297
3298static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3299{
3300 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3301 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3302 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3303
3304 tsk1->peer.family = AF_TIPC;
3305 tsk1->peer.addrtype = TIPC_ADDR_ID;
3306 tsk1->peer.scope = TIPC_NODE_SCOPE;
3307 tsk1->peer.addr.id.ref = tsk2->portid;
3308 tsk1->peer.addr.id.node = onode;
3309 tsk2->peer.family = AF_TIPC;
3310 tsk2->peer.addrtype = TIPC_ADDR_ID;
3311 tsk2->peer.scope = TIPC_NODE_SCOPE;
3312 tsk2->peer.addr.id.ref = tsk1->portid;
3313 tsk2->peer.addr.id.node = onode;
3314
3315 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3316 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3317 return 0;
3318}
3319
3320/* Protocol switches for the various types of TIPC sockets */
3321
3322static const struct proto_ops msg_ops = {
3323 .owner = THIS_MODULE,
3324 .family = AF_TIPC,
3325 .release = tipc_release,
3326 .bind = tipc_bind,
3327 .connect = tipc_connect,
3328 .socketpair = tipc_socketpair,
3329 .accept = sock_no_accept,
3330 .getname = tipc_getname,
3331 .poll = tipc_poll,
3332 .ioctl = tipc_ioctl,
3333 .listen = sock_no_listen,
3334 .shutdown = tipc_shutdown,
3335 .setsockopt = tipc_setsockopt,
3336 .getsockopt = tipc_getsockopt,
3337 .sendmsg = tipc_sendmsg,
3338 .recvmsg = tipc_recvmsg,
3339 .mmap = sock_no_mmap,
3340 .sendpage = sock_no_sendpage
3341};
3342
3343static const struct proto_ops packet_ops = {
3344 .owner = THIS_MODULE,
3345 .family = AF_TIPC,
3346 .release = tipc_release,
3347 .bind = tipc_bind,
3348 .connect = tipc_connect,
3349 .socketpair = tipc_socketpair,
3350 .accept = tipc_accept,
3351 .getname = tipc_getname,
3352 .poll = tipc_poll,
3353 .ioctl = tipc_ioctl,
3354 .listen = tipc_listen,
3355 .shutdown = tipc_shutdown,
3356 .setsockopt = tipc_setsockopt,
3357 .getsockopt = tipc_getsockopt,
3358 .sendmsg = tipc_send_packet,
3359 .recvmsg = tipc_recvmsg,
3360 .mmap = sock_no_mmap,
3361 .sendpage = sock_no_sendpage
3362};
3363
3364static const struct proto_ops stream_ops = {
3365 .owner = THIS_MODULE,
3366 .family = AF_TIPC,
3367 .release = tipc_release,
3368 .bind = tipc_bind,
3369 .connect = tipc_connect,
3370 .socketpair = tipc_socketpair,
3371 .accept = tipc_accept,
3372 .getname = tipc_getname,
3373 .poll = tipc_poll,
3374 .ioctl = tipc_ioctl,
3375 .listen = tipc_listen,
3376 .shutdown = tipc_shutdown,
3377 .setsockopt = tipc_setsockopt,
3378 .getsockopt = tipc_getsockopt,
3379 .sendmsg = tipc_sendstream,
3380 .recvmsg = tipc_recvstream,
3381 .mmap = sock_no_mmap,
3382 .sendpage = sock_no_sendpage
3383};
3384
3385static const struct net_proto_family tipc_family_ops = {
3386 .owner = THIS_MODULE,
3387 .family = AF_TIPC,
3388 .create = tipc_sk_create
3389};
3390
3391static struct proto tipc_proto = {
3392 .name = "TIPC",
3393 .owner = THIS_MODULE,
3394 .obj_size = sizeof(struct tipc_sock),
3395 .sysctl_rmem = sysctl_tipc_rmem
3396};
3397
3398/**
3399 * tipc_socket_init - initialize TIPC socket interface
3400 *
3401 * Returns 0 on success, errno otherwise
3402 */
3403int tipc_socket_init(void)
3404{
3405 int res;
3406
3407 res = proto_register(&tipc_proto, 1);
3408 if (res) {
3409 pr_err("Failed to register TIPC protocol type\n");
3410 goto out;
3411 }
3412
3413 res = sock_register(&tipc_family_ops);
3414 if (res) {
3415 pr_err("Failed to register TIPC socket type\n");
3416 proto_unregister(&tipc_proto);
3417 goto out;
3418 }
3419 out:
3420 return res;
3421}
3422
3423/**
3424 * tipc_socket_stop - stop TIPC socket interface
3425 */
3426void tipc_socket_stop(void)
3427{
3428 sock_unregister(tipc_family_ops.family);
3429 proto_unregister(&tipc_proto);
3430}
3431
3432/* Caller should hold socket lock for the passed tipc socket. */
3433static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3434{
3435 u32 peer_node;
3436 u32 peer_port;
3437 struct nlattr *nest;
3438
3439 peer_node = tsk_peer_node(tsk);
3440 peer_port = tsk_peer_port(tsk);
3441
3442 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3443 if (!nest)
3444 return -EMSGSIZE;
3445
3446 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3447 goto msg_full;
3448 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3449 goto msg_full;
3450
3451 if (tsk->conn_type != 0) {
3452 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3453 goto msg_full;
3454 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
3455 goto msg_full;
3456 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
3457 goto msg_full;
3458 }
3459 nla_nest_end(skb, nest);
3460
3461 return 0;
3462
3463msg_full:
3464 nla_nest_cancel(skb, nest);
3465
3466 return -EMSGSIZE;
3467}
3468
3469static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3470 *tsk)
3471{
3472 struct net *net = sock_net(skb->sk);
3473 struct sock *sk = &tsk->sk;
3474
3475 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3476 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3477 return -EMSGSIZE;
3478
3479 if (tipc_sk_connected(sk)) {
3480 if (__tipc_nl_add_sk_con(skb, tsk))
3481 return -EMSGSIZE;
3482 } else if (!list_empty(&tsk->publications)) {
3483 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3484 return -EMSGSIZE;
3485 }
3486 return 0;
3487}
3488
3489/* Caller should hold socket lock for the passed tipc socket. */
3490static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3491 struct tipc_sock *tsk)
3492{
3493 struct nlattr *attrs;
3494 void *hdr;
3495
3496 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3497 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3498 if (!hdr)
3499 goto msg_cancel;
3500
3501 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3502 if (!attrs)
3503 goto genlmsg_cancel;
3504
3505 if (__tipc_nl_add_sk_info(skb, tsk))
3506 goto attr_msg_cancel;
3507
3508 nla_nest_end(skb, attrs);
3509 genlmsg_end(skb, hdr);
3510
3511 return 0;
3512
3513attr_msg_cancel:
3514 nla_nest_cancel(skb, attrs);
3515genlmsg_cancel:
3516 genlmsg_cancel(skb, hdr);
3517msg_cancel:
3518 return -EMSGSIZE;
3519}
3520
3521int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3522 int (*skb_handler)(struct sk_buff *skb,
3523 struct netlink_callback *cb,
3524 struct tipc_sock *tsk))
3525{
3526 struct rhashtable_iter *iter = (void *)cb->args[4];
3527 struct tipc_sock *tsk;
3528 int err;
3529
3530 rhashtable_walk_start(iter);
3531 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3532 if (IS_ERR(tsk)) {
3533 err = PTR_ERR(tsk);
3534 if (err == -EAGAIN) {
3535 err = 0;
3536 continue;
3537 }
3538 break;
3539 }
3540
3541 sock_hold(&tsk->sk);
3542 rhashtable_walk_stop(iter);
3543 lock_sock(&tsk->sk);
3544 err = skb_handler(skb, cb, tsk);
3545 if (err) {
3546 release_sock(&tsk->sk);
3547 sock_put(&tsk->sk);
3548 goto out;
3549 }
3550 release_sock(&tsk->sk);
3551 rhashtable_walk_start(iter);
3552 sock_put(&tsk->sk);
3553 }
3554 rhashtable_walk_stop(iter);
3555out:
3556 return skb->len;
3557}
3558EXPORT_SYMBOL(tipc_nl_sk_walk);
3559
3560int tipc_dump_start(struct netlink_callback *cb)
3561{
3562 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3563}
3564EXPORT_SYMBOL(tipc_dump_start);
3565
3566int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3567{
3568 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3569 struct rhashtable_iter *iter = (void *)cb->args[4];
3570 struct tipc_net *tn = tipc_net(net);
3571
3572 if (!iter) {
3573 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3574 if (!iter)
3575 return -ENOMEM;
3576
3577 cb->args[4] = (long)iter;
3578 }
3579
3580 rhashtable_walk_enter(&tn->sk_rht, iter);
3581 return 0;
3582}
3583
3584int tipc_dump_done(struct netlink_callback *cb)
3585{
3586 struct rhashtable_iter *hti = (void *)cb->args[4];
3587
3588 rhashtable_walk_exit(hti);
3589 kfree(hti);
3590 return 0;
3591}
3592EXPORT_SYMBOL(tipc_dump_done);
3593
3594int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3595 struct tipc_sock *tsk, u32 sk_filter_state,
3596 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3597{
3598 struct sock *sk = &tsk->sk;
3599 struct nlattr *attrs;
3600 struct nlattr *stat;
3601
3602 /*filter response w.r.t sk_state*/
3603 if (!(sk_filter_state & (1 << sk->sk_state)))
3604 return 0;
3605
3606 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3607 if (!attrs)
3608 goto msg_cancel;
3609
3610 if (__tipc_nl_add_sk_info(skb, tsk))
3611 goto attr_msg_cancel;
3612
3613 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3614 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3615 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3616 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3617 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3618 sock_i_uid(sk))) ||
3619 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3620 tipc_diag_gen_cookie(sk),
3621 TIPC_NLA_SOCK_PAD))
3622 goto attr_msg_cancel;
3623
3624 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3625 if (!stat)
3626 goto attr_msg_cancel;
3627
3628 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3629 skb_queue_len(&sk->sk_receive_queue)) ||
3630 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3631 skb_queue_len(&sk->sk_write_queue)) ||
3632 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3633 atomic_read(&sk->sk_drops)))
3634 goto stat_msg_cancel;
3635
3636 if (tsk->cong_link_cnt &&
3637 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3638 goto stat_msg_cancel;
3639
3640 if (tsk_conn_cong(tsk) &&
3641 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3642 goto stat_msg_cancel;
3643
3644 nla_nest_end(skb, stat);
3645
3646 if (tsk->group)
3647 if (tipc_group_fill_sock_diag(tsk->group, skb))
3648 goto stat_msg_cancel;
3649
3650 nla_nest_end(skb, attrs);
3651
3652 return 0;
3653
3654stat_msg_cancel:
3655 nla_nest_cancel(skb, stat);
3656attr_msg_cancel:
3657 nla_nest_cancel(skb, attrs);
3658msg_cancel:
3659 return -EMSGSIZE;
3660}
3661EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3662
3663int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3664{
3665 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3666}
3667
3668/* Caller should hold socket lock for the passed tipc socket. */
3669static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3670 struct netlink_callback *cb,
3671 struct publication *publ)
3672{
3673 void *hdr;
3674 struct nlattr *attrs;
3675
3676 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3677 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3678 if (!hdr)
3679 goto msg_cancel;
3680
3681 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3682 if (!attrs)
3683 goto genlmsg_cancel;
3684
3685 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3686 goto attr_msg_cancel;
3687 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
3688 goto attr_msg_cancel;
3689 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
3690 goto attr_msg_cancel;
3691 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
3692 goto attr_msg_cancel;
3693
3694 nla_nest_end(skb, attrs);
3695 genlmsg_end(skb, hdr);
3696
3697 return 0;
3698
3699attr_msg_cancel:
3700 nla_nest_cancel(skb, attrs);
3701genlmsg_cancel:
3702 genlmsg_cancel(skb, hdr);
3703msg_cancel:
3704 return -EMSGSIZE;
3705}
3706
3707/* Caller should hold socket lock for the passed tipc socket. */
3708static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3709 struct netlink_callback *cb,
3710 struct tipc_sock *tsk, u32 *last_publ)
3711{
3712 int err;
3713 struct publication *p;
3714
3715 if (*last_publ) {
3716 list_for_each_entry(p, &tsk->publications, binding_sock) {
3717 if (p->key == *last_publ)
3718 break;
3719 }
3720 if (p->key != *last_publ) {
3721 /* We never set seq or call nl_dump_check_consistent()
3722 * this means that setting prev_seq here will cause the
3723 * consistence check to fail in the netlink callback
3724 * handler. Resulting in the last NLMSG_DONE message
3725 * having the NLM_F_DUMP_INTR flag set.
3726 */
3727 cb->prev_seq = 1;
3728 *last_publ = 0;
3729 return -EPIPE;
3730 }
3731 } else {
3732 p = list_first_entry(&tsk->publications, struct publication,
3733 binding_sock);
3734 }
3735
3736 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3737 err = __tipc_nl_add_sk_publ(skb, cb, p);
3738 if (err) {
3739 *last_publ = p->key;
3740 return err;
3741 }
3742 }
3743 *last_publ = 0;
3744
3745 return 0;
3746}
3747
3748int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3749{
3750 int err;
3751 u32 tsk_portid = cb->args[0];
3752 u32 last_publ = cb->args[1];
3753 u32 done = cb->args[2];
3754 struct net *net = sock_net(skb->sk);
3755 struct tipc_sock *tsk;
3756
3757 if (!tsk_portid) {
3758 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
3759 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3760
3761 if (!attrs[TIPC_NLA_SOCK])
3762 return -EINVAL;
3763
3764 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3765 attrs[TIPC_NLA_SOCK],
3766 tipc_nl_sock_policy, NULL);
3767 if (err)
3768 return err;
3769
3770 if (!sock[TIPC_NLA_SOCK_REF])
3771 return -EINVAL;
3772
3773 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3774 }
3775
3776 if (done)
3777 return 0;
3778
3779 tsk = tipc_sk_lookup(net, tsk_portid);
3780 if (!tsk)
3781 return -EINVAL;
3782
3783 lock_sock(&tsk->sk);
3784 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3785 if (!err)
3786 done = 1;
3787 release_sock(&tsk->sk);
3788 sock_put(&tsk->sk);
3789
3790 cb->args[0] = tsk_portid;
3791 cb->args[1] = last_publ;
3792 cb->args[2] = done;
3793
3794 return skb->len;
3795}
3796
3797/**
3798 * tipc_sk_filtering - check if a socket should be traced
3799 * @sk: the socket to be examined
3800 * @sysctl_tipc_sk_filter[]: the socket tuple for filtering,
3801 * (portid, sock type, name type, name lower, name upper)
3802 *
3803 * Returns true if the socket meets the socket tuple data
3804 * (value 0 = 'any') or when there is no tuple set (all = 0),
3805 * otherwise false
3806 */
3807bool tipc_sk_filtering(struct sock *sk)
3808{
3809 struct tipc_sock *tsk;
3810 struct publication *p;
3811 u32 _port, _sktype, _type, _lower, _upper;
3812 u32 type = 0, lower = 0, upper = 0;
3813
3814 if (!sk)
3815 return true;
3816
3817 tsk = tipc_sk(sk);
3818
3819 _port = sysctl_tipc_sk_filter[0];
3820 _sktype = sysctl_tipc_sk_filter[1];
3821 _type = sysctl_tipc_sk_filter[2];
3822 _lower = sysctl_tipc_sk_filter[3];
3823 _upper = sysctl_tipc_sk_filter[4];
3824
3825 if (!_port && !_sktype && !_type && !_lower && !_upper)
3826 return true;
3827
3828 if (_port)
3829 return (_port == tsk->portid);
3830
3831 if (_sktype && _sktype != sk->sk_type)
3832 return false;
3833
3834 if (tsk->published) {
3835 p = list_first_entry_or_null(&tsk->publications,
3836 struct publication, binding_sock);
3837 if (p) {
3838 type = p->type;
3839 lower = p->lower;
3840 upper = p->upper;
3841 }
3842 }
3843
3844 if (!tipc_sk_type_connectionless(sk)) {
3845 type = tsk->conn_type;
3846 lower = tsk->conn_instance;
3847 upper = tsk->conn_instance;
3848 }
3849
3850 if ((_type && _type != type) || (_lower && _lower != lower) ||
3851 (_upper && _upper != upper))
3852 return false;
3853
3854 return true;
3855}
3856
3857u32 tipc_sock_get_portid(struct sock *sk)
3858{
3859 return (sk) ? (tipc_sk(sk))->portid : 0;
3860}
3861
3862/**
3863 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3864 * both the rcv and backlog queues are considered
3865 * @sk: tipc sk to be checked
3866 * @skb: tipc msg to be checked
3867 *
3868 * Returns true if the socket rx queue allocation is > 90%, otherwise false
3869 */
3870
3871bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3872{
3873 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3874 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3875 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3876
3877 return (qsize > lim * 90 / 100);
3878}
3879
3880/**
3881 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3882 * only the rcv queue is considered
3883 * @sk: tipc sk to be checked
3884 * @skb: tipc msg to be checked
3885 *
3886 * Returns true if the socket rx queue allocation is > 90%, otherwise false
3887 */
3888
3889bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3890{
3891 unsigned int lim = rcvbuf_limit(sk, skb);
3892 unsigned int qsize = sk_rmem_alloc_get(sk);
3893
3894 return (qsize > lim * 90 / 100);
3895}
3896
3897/**
3898 * tipc_sk_dump - dump TIPC socket
3899 * @sk: tipc sk to be dumped
3900 * @dqueues: bitmask to decide if any socket queue to be dumped?
3901 * - TIPC_DUMP_NONE: don't dump socket queues
3902 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3903 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3904 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3905 * - TIPC_DUMP_ALL: dump all the socket queues above
3906 * @buf: returned buffer of dump data in format
3907 */
3908int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3909{
3910 int i = 0;
3911 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3912 struct tipc_sock *tsk;
3913 struct publication *p;
3914 bool tsk_connected;
3915
3916 if (!sk) {
3917 i += scnprintf(buf, sz, "sk data: (null)\n");
3918 return i;
3919 }
3920
3921 tsk = tipc_sk(sk);
3922 tsk_connected = !tipc_sk_type_connectionless(sk);
3923
3924 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3925 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3926 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3927 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3928 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3929 if (tsk_connected) {
3930 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3931 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3932 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type);
3933 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance);
3934 }
3935 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3936 if (tsk->published) {
3937 p = list_first_entry_or_null(&tsk->publications,
3938 struct publication, binding_sock);
3939 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0);
3940 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0);
3941 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0);
3942 }
3943 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3944 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3945 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3946 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3947 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3948 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3949 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3950 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3951 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3952 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3953 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3954 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3955 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3956 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3957
3958 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3959 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3960 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3961 }
3962
3963 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3964 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3965 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
3966 }
3967
3968 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
3969 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
3970 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
3971 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
3972 i += scnprintf(buf + i, sz - i, " tail ");
3973 i += tipc_skb_dump(sk->sk_backlog.tail, false,
3974 buf + i);
3975 }
3976 }
3977
3978 return i;
3979}
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 void tipc_sk_timeout(struct timer_list *t);
150static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
151static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
152static int tipc_sk_leave(struct tipc_sock *tsk);
153static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
154static int tipc_sk_insert(struct tipc_sock *tsk);
155static void tipc_sk_remove(struct tipc_sock *tsk);
156static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
157static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
158static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
159static int tipc_wait_for_connect(struct socket *sock, long *timeo_p);
160
161static const struct proto_ops packet_ops;
162static const struct proto_ops stream_ops;
163static const struct proto_ops msg_ops;
164static struct proto tipc_proto;
165static const struct rhashtable_params tsk_rht_params;
166
167static u32 tsk_own_node(struct tipc_sock *tsk)
168{
169 return msg_prevnode(&tsk->phdr);
170}
171
172static u32 tsk_peer_node(struct tipc_sock *tsk)
173{
174 return msg_destnode(&tsk->phdr);
175}
176
177static u32 tsk_peer_port(struct tipc_sock *tsk)
178{
179 return msg_destport(&tsk->phdr);
180}
181
182static bool tsk_unreliable(struct tipc_sock *tsk)
183{
184 return msg_src_droppable(&tsk->phdr) != 0;
185}
186
187static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
188{
189 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
190}
191
192static bool tsk_unreturnable(struct tipc_sock *tsk)
193{
194 return msg_dest_droppable(&tsk->phdr) != 0;
195}
196
197static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
198{
199 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
200}
201
202static int tsk_importance(struct tipc_sock *tsk)
203{
204 return msg_importance(&tsk->phdr);
205}
206
207static struct tipc_sock *tipc_sk(const struct sock *sk)
208{
209 return container_of(sk, struct tipc_sock, sk);
210}
211
212int tsk_set_importance(struct sock *sk, int imp)
213{
214 if (imp > TIPC_CRITICAL_IMPORTANCE)
215 return -EINVAL;
216 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
217 return 0;
218}
219
220static bool tsk_conn_cong(struct tipc_sock *tsk)
221{
222 return tsk->snt_unacked > tsk->snd_win;
223}
224
225static u16 tsk_blocks(int len)
226{
227 return ((len / FLOWCTL_BLK_SZ) + 1);
228}
229
230/* tsk_blocks(): translate a buffer size in bytes to number of
231 * advertisable blocks, taking into account the ratio truesize(len)/len
232 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
233 */
234static u16 tsk_adv_blocks(int len)
235{
236 return len / FLOWCTL_BLK_SZ / 4;
237}
238
239/* tsk_inc(): increment counter for sent or received data
240 * - If block based flow control is not supported by peer we
241 * fall back to message based ditto, incrementing the counter
242 */
243static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
244{
245 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
246 return ((msglen / FLOWCTL_BLK_SZ) + 1);
247 return 1;
248}
249
250/* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
251 */
252static void tsk_set_nagle(struct tipc_sock *tsk)
253{
254 struct sock *sk = &tsk->sk;
255
256 tsk->maxnagle = 0;
257 if (sk->sk_type != SOCK_STREAM)
258 return;
259 if (tsk->nodelay)
260 return;
261 if (!(tsk->peer_caps & TIPC_NAGLE))
262 return;
263 /* Limit node local buffer size to avoid receive queue overflow */
264 if (tsk->max_pkt == MAX_MSG_SIZE)
265 tsk->maxnagle = 1500;
266 else
267 tsk->maxnagle = tsk->max_pkt;
268}
269
270/**
271 * tsk_advance_rx_queue - discard first buffer in socket receive queue
272 * @sk: network socket
273 *
274 * Caller must hold socket lock
275 */
276static void tsk_advance_rx_queue(struct sock *sk)
277{
278 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
279 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
280}
281
282/* tipc_sk_respond() : send response message back to sender
283 */
284static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
285{
286 u32 selector;
287 u32 dnode;
288 u32 onode = tipc_own_addr(sock_net(sk));
289
290 if (!tipc_msg_reverse(onode, &skb, err))
291 return;
292
293 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
294 dnode = msg_destnode(buf_msg(skb));
295 selector = msg_origport(buf_msg(skb));
296 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
297}
298
299/**
300 * tsk_rej_rx_queue - reject all buffers in socket receive queue
301 * @sk: network socket
302 * @error: response error code
303 *
304 * Caller must hold socket lock
305 */
306static void tsk_rej_rx_queue(struct sock *sk, int error)
307{
308 struct sk_buff *skb;
309
310 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
311 tipc_sk_respond(sk, skb, error);
312}
313
314static bool tipc_sk_connected(const struct sock *sk)
315{
316 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED;
317}
318
319/* tipc_sk_type_connectionless - check if the socket is datagram socket
320 * @sk: socket
321 *
322 * Returns true if connection less, false otherwise
323 */
324static bool tipc_sk_type_connectionless(struct sock *sk)
325{
326 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
327}
328
329/* tsk_peer_msg - verify if message was sent by connected port's peer
330 *
331 * Handles cases where the node's network address has changed from
332 * the default of <0.0.0> to its configured setting.
333 */
334static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
335{
336 struct sock *sk = &tsk->sk;
337 u32 self = tipc_own_addr(sock_net(sk));
338 u32 peer_port = tsk_peer_port(tsk);
339 u32 orig_node, peer_node;
340
341 if (unlikely(!tipc_sk_connected(sk)))
342 return false;
343
344 if (unlikely(msg_origport(msg) != peer_port))
345 return false;
346
347 orig_node = msg_orignode(msg);
348 peer_node = tsk_peer_node(tsk);
349
350 if (likely(orig_node == peer_node))
351 return true;
352
353 if (!orig_node && peer_node == self)
354 return true;
355
356 if (!peer_node && orig_node == self)
357 return true;
358
359 return false;
360}
361
362/* tipc_set_sk_state - set the sk_state of the socket
363 * @sk: socket
364 *
365 * Caller must hold socket lock
366 *
367 * Returns 0 on success, errno otherwise
368 */
369static int tipc_set_sk_state(struct sock *sk, int state)
370{
371 int oldsk_state = sk->sk_state;
372 int res = -EINVAL;
373
374 switch (state) {
375 case TIPC_OPEN:
376 res = 0;
377 break;
378 case TIPC_LISTEN:
379 case TIPC_CONNECTING:
380 if (oldsk_state == TIPC_OPEN)
381 res = 0;
382 break;
383 case TIPC_ESTABLISHED:
384 if (oldsk_state == TIPC_CONNECTING ||
385 oldsk_state == TIPC_OPEN)
386 res = 0;
387 break;
388 case TIPC_DISCONNECTING:
389 if (oldsk_state == TIPC_CONNECTING ||
390 oldsk_state == TIPC_ESTABLISHED)
391 res = 0;
392 break;
393 }
394
395 if (!res)
396 sk->sk_state = state;
397
398 return res;
399}
400
401static int tipc_sk_sock_err(struct socket *sock, long *timeout)
402{
403 struct sock *sk = sock->sk;
404 int err = sock_error(sk);
405 int typ = sock->type;
406
407 if (err)
408 return err;
409 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
410 if (sk->sk_state == TIPC_DISCONNECTING)
411 return -EPIPE;
412 else if (!tipc_sk_connected(sk))
413 return -ENOTCONN;
414 }
415 if (!*timeout)
416 return -EAGAIN;
417 if (signal_pending(current))
418 return sock_intr_errno(*timeout);
419
420 return 0;
421}
422
423#define tipc_wait_for_cond(sock_, timeo_, condition_) \
424({ \
425 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
426 struct sock *sk_; \
427 int rc_; \
428 \
429 while ((rc_ = !(condition_))) { \
430 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
431 smp_rmb(); \
432 sk_ = (sock_)->sk; \
433 rc_ = tipc_sk_sock_err((sock_), timeo_); \
434 if (rc_) \
435 break; \
436 add_wait_queue(sk_sleep(sk_), &wait_); \
437 release_sock(sk_); \
438 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
439 sched_annotate_sleep(); \
440 lock_sock(sk_); \
441 remove_wait_queue(sk_sleep(sk_), &wait_); \
442 } \
443 rc_; \
444})
445
446/**
447 * tipc_sk_create - create a TIPC socket
448 * @net: network namespace (must be default network)
449 * @sock: pre-allocated socket structure
450 * @protocol: protocol indicator (must be 0)
451 * @kern: caused by kernel or by userspace?
452 *
453 * This routine creates additional data structures used by the TIPC socket,
454 * initializes them, and links them together.
455 *
456 * Return: 0 on success, errno otherwise
457 */
458static int tipc_sk_create(struct net *net, struct socket *sock,
459 int protocol, int kern)
460{
461 const struct proto_ops *ops;
462 struct sock *sk;
463 struct tipc_sock *tsk;
464 struct tipc_msg *msg;
465
466 /* Validate arguments */
467 if (unlikely(protocol != 0))
468 return -EPROTONOSUPPORT;
469
470 switch (sock->type) {
471 case SOCK_STREAM:
472 ops = &stream_ops;
473 break;
474 case SOCK_SEQPACKET:
475 ops = &packet_ops;
476 break;
477 case SOCK_DGRAM:
478 case SOCK_RDM:
479 ops = &msg_ops;
480 break;
481 default:
482 return -EPROTOTYPE;
483 }
484
485 /* Allocate socket's protocol area */
486 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
487 if (sk == NULL)
488 return -ENOMEM;
489
490 tsk = tipc_sk(sk);
491 tsk->max_pkt = MAX_PKT_DEFAULT;
492 tsk->maxnagle = 0;
493 tsk->nagle_start = NAGLE_START_INIT;
494 INIT_LIST_HEAD(&tsk->publications);
495 INIT_LIST_HEAD(&tsk->cong_links);
496 msg = &tsk->phdr;
497
498 /* Finish initializing socket data structures */
499 sock->ops = ops;
500 sock_init_data(sock, sk);
501 tipc_set_sk_state(sk, TIPC_OPEN);
502 if (tipc_sk_insert(tsk)) {
503 sk_free(sk);
504 pr_warn("Socket create failed; port number exhausted\n");
505 return -EINVAL;
506 }
507
508 /* Ensure tsk is visible before we read own_addr. */
509 smp_mb();
510
511 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
512 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
513
514 msg_set_origport(msg, tsk->portid);
515 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
516 sk->sk_shutdown = 0;
517 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
518 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]);
519 sk->sk_data_ready = tipc_data_ready;
520 sk->sk_write_space = tipc_write_space;
521 sk->sk_destruct = tipc_sock_destruct;
522 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
523 tsk->group_is_open = true;
524 atomic_set(&tsk->dupl_rcvcnt, 0);
525
526 /* Start out with safe limits until we receive an advertised window */
527 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
528 tsk->rcv_win = tsk->snd_win;
529
530 if (tipc_sk_type_connectionless(sk)) {
531 tsk_set_unreturnable(tsk, true);
532 if (sock->type == SOCK_DGRAM)
533 tsk_set_unreliable(tsk, true);
534 }
535 __skb_queue_head_init(&tsk->mc_method.deferredq);
536 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
537 return 0;
538}
539
540static void tipc_sk_callback(struct rcu_head *head)
541{
542 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
543
544 sock_put(&tsk->sk);
545}
546
547/* Caller should hold socket lock for the socket. */
548static void __tipc_shutdown(struct socket *sock, int error)
549{
550 struct sock *sk = sock->sk;
551 struct tipc_sock *tsk = tipc_sk(sk);
552 struct net *net = sock_net(sk);
553 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
554 u32 dnode = tsk_peer_node(tsk);
555 struct sk_buff *skb;
556
557 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
558 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
559 !tsk_conn_cong(tsk)));
560
561 /* Push out delayed messages if in Nagle mode */
562 tipc_sk_push_backlog(tsk, false);
563 /* Remove pending SYN */
564 __skb_queue_purge(&sk->sk_write_queue);
565
566 /* Remove partially received buffer if any */
567 skb = skb_peek(&sk->sk_receive_queue);
568 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
569 __skb_unlink(skb, &sk->sk_receive_queue);
570 kfree_skb(skb);
571 }
572
573 /* Reject all unreceived messages if connectionless */
574 if (tipc_sk_type_connectionless(sk)) {
575 tsk_rej_rx_queue(sk, error);
576 return;
577 }
578
579 switch (sk->sk_state) {
580 case TIPC_CONNECTING:
581 case TIPC_ESTABLISHED:
582 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
583 tipc_node_remove_conn(net, dnode, tsk->portid);
584 /* Send a FIN+/- to its peer */
585 skb = __skb_dequeue(&sk->sk_receive_queue);
586 if (skb) {
587 __skb_queue_purge(&sk->sk_receive_queue);
588 tipc_sk_respond(sk, skb, error);
589 break;
590 }
591 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
592 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
593 tsk_own_node(tsk), tsk_peer_port(tsk),
594 tsk->portid, error);
595 if (skb)
596 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
597 break;
598 case TIPC_LISTEN:
599 /* Reject all SYN messages */
600 tsk_rej_rx_queue(sk, error);
601 break;
602 default:
603 __skb_queue_purge(&sk->sk_receive_queue);
604 break;
605 }
606}
607
608/**
609 * tipc_release - destroy a TIPC socket
610 * @sock: socket to destroy
611 *
612 * This routine cleans up any messages that are still queued on the socket.
613 * For DGRAM and RDM socket types, all queued messages are rejected.
614 * For SEQPACKET and STREAM socket types, the first message is rejected
615 * and any others are discarded. (If the first message on a STREAM socket
616 * is partially-read, it is discarded and the next one is rejected instead.)
617 *
618 * NOTE: Rejected messages are not necessarily returned to the sender! They
619 * are returned or discarded according to the "destination droppable" setting
620 * specified for the message by the sender.
621 *
622 * Return: 0 on success, errno otherwise
623 */
624static int tipc_release(struct socket *sock)
625{
626 struct sock *sk = sock->sk;
627 struct tipc_sock *tsk;
628
629 /*
630 * Exit if socket isn't fully initialized (occurs when a failed accept()
631 * releases a pre-allocated child socket that was never used)
632 */
633 if (sk == NULL)
634 return 0;
635
636 tsk = tipc_sk(sk);
637 lock_sock(sk);
638
639 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
640 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
641 sk->sk_shutdown = SHUTDOWN_MASK;
642 tipc_sk_leave(tsk);
643 tipc_sk_withdraw(tsk, NULL);
644 __skb_queue_purge(&tsk->mc_method.deferredq);
645 sk_stop_timer(sk, &sk->sk_timer);
646 tipc_sk_remove(tsk);
647
648 sock_orphan(sk);
649 /* Reject any messages that accumulated in backlog queue */
650 release_sock(sk);
651 tipc_dest_list_purge(&tsk->cong_links);
652 tsk->cong_link_cnt = 0;
653 call_rcu(&tsk->rcu, tipc_sk_callback);
654 sock->sk = NULL;
655
656 return 0;
657}
658
659/**
660 * __tipc_bind - associate or disassociate TIPC name(s) with a socket
661 * @sock: socket structure
662 * @skaddr: socket address describing name(s) and desired operation
663 * @alen: size of socket address data structure
664 *
665 * Name and name sequence binding are indicated using a positive scope value;
666 * a negative scope value unbinds the specified name. Specifying no name
667 * (i.e. a socket address length of 0) unbinds all names from the socket.
668 *
669 * Return: 0 on success, errno otherwise
670 *
671 * NOTE: This routine doesn't need to take the socket lock since it doesn't
672 * access any non-constant socket information.
673 */
674static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
675{
676 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
677 struct tipc_sock *tsk = tipc_sk(sock->sk);
678 bool unbind = false;
679
680 if (unlikely(!alen))
681 return tipc_sk_withdraw(tsk, NULL);
682
683 if (ua->addrtype == TIPC_SERVICE_ADDR) {
684 ua->addrtype = TIPC_SERVICE_RANGE;
685 ua->sr.upper = ua->sr.lower;
686 }
687 if (ua->scope < 0) {
688 unbind = true;
689 ua->scope = -ua->scope;
690 }
691 /* Users may still use deprecated TIPC_ZONE_SCOPE */
692 if (ua->scope != TIPC_NODE_SCOPE)
693 ua->scope = TIPC_CLUSTER_SCOPE;
694
695 if (tsk->group)
696 return -EACCES;
697
698 if (unbind)
699 return tipc_sk_withdraw(tsk, ua);
700 return tipc_sk_publish(tsk, ua);
701}
702
703int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
704{
705 int res;
706
707 lock_sock(sock->sk);
708 res = __tipc_bind(sock, skaddr, alen);
709 release_sock(sock->sk);
710 return res;
711}
712
713static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
714{
715 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
716 u32 atype = ua->addrtype;
717
718 if (alen) {
719 if (!tipc_uaddr_valid(ua, alen))
720 return -EINVAL;
721 if (atype == TIPC_SOCKET_ADDR)
722 return -EAFNOSUPPORT;
723 if (ua->sr.type < TIPC_RESERVED_TYPES) {
724 pr_warn_once("Can't bind to reserved service type %u\n",
725 ua->sr.type);
726 return -EACCES;
727 }
728 }
729 return tipc_sk_bind(sock, skaddr, alen);
730}
731
732/**
733 * tipc_getname - get port ID of socket or peer socket
734 * @sock: socket structure
735 * @uaddr: area for returned socket address
736 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
737 *
738 * Return: 0 on success, errno otherwise
739 *
740 * NOTE: This routine doesn't need to take the socket lock since it only
741 * accesses socket information that is unchanging (or which changes in
742 * a completely predictable manner).
743 */
744static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
745 int peer)
746{
747 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
748 struct sock *sk = sock->sk;
749 struct tipc_sock *tsk = tipc_sk(sk);
750
751 memset(addr, 0, sizeof(*addr));
752 if (peer) {
753 if ((!tipc_sk_connected(sk)) &&
754 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
755 return -ENOTCONN;
756 addr->addr.id.ref = tsk_peer_port(tsk);
757 addr->addr.id.node = tsk_peer_node(tsk);
758 } else {
759 addr->addr.id.ref = tsk->portid;
760 addr->addr.id.node = tipc_own_addr(sock_net(sk));
761 }
762
763 addr->addrtype = TIPC_SOCKET_ADDR;
764 addr->family = AF_TIPC;
765 addr->scope = 0;
766 addr->addr.name.domain = 0;
767
768 return sizeof(*addr);
769}
770
771/**
772 * tipc_poll - read and possibly block on pollmask
773 * @file: file structure associated with the socket
774 * @sock: socket for which to calculate the poll bits
775 * @wait: ???
776 *
777 * Return: pollmask value
778 *
779 * COMMENTARY:
780 * It appears that the usual socket locking mechanisms are not useful here
781 * since the pollmask info is potentially out-of-date the moment this routine
782 * exits. TCP and other protocols seem to rely on higher level poll routines
783 * to handle any preventable race conditions, so TIPC will do the same ...
784 *
785 * IMPORTANT: The fact that a read or write operation is indicated does NOT
786 * imply that the operation will succeed, merely that it should be performed
787 * and will not block.
788 */
789static __poll_t tipc_poll(struct file *file, struct socket *sock,
790 poll_table *wait)
791{
792 struct sock *sk = sock->sk;
793 struct tipc_sock *tsk = tipc_sk(sk);
794 __poll_t revents = 0;
795
796 sock_poll_wait(file, sock, wait);
797 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
798
799 if (sk->sk_shutdown & RCV_SHUTDOWN)
800 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
801 if (sk->sk_shutdown == SHUTDOWN_MASK)
802 revents |= EPOLLHUP;
803
804 switch (sk->sk_state) {
805 case TIPC_ESTABLISHED:
806 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
807 revents |= EPOLLOUT;
808 fallthrough;
809 case TIPC_LISTEN:
810 case TIPC_CONNECTING:
811 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
812 revents |= EPOLLIN | EPOLLRDNORM;
813 break;
814 case TIPC_OPEN:
815 if (tsk->group_is_open && !tsk->cong_link_cnt)
816 revents |= EPOLLOUT;
817 if (!tipc_sk_type_connectionless(sk))
818 break;
819 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
820 break;
821 revents |= EPOLLIN | EPOLLRDNORM;
822 break;
823 case TIPC_DISCONNECTING:
824 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
825 break;
826 }
827 return revents;
828}
829
830/**
831 * tipc_sendmcast - send multicast message
832 * @sock: socket structure
833 * @ua: destination address struct
834 * @msg: message to send
835 * @dlen: length of data to send
836 * @timeout: timeout to wait for wakeup
837 *
838 * Called from function tipc_sendmsg(), which has done all sanity checks
839 * Return: the number of bytes sent on success, or errno
840 */
841static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua,
842 struct msghdr *msg, size_t dlen, long timeout)
843{
844 struct sock *sk = sock->sk;
845 struct tipc_sock *tsk = tipc_sk(sk);
846 struct tipc_msg *hdr = &tsk->phdr;
847 struct net *net = sock_net(sk);
848 int mtu = tipc_bcast_get_mtu(net);
849 struct sk_buff_head pkts;
850 struct tipc_nlist dsts;
851 int rc;
852
853 if (tsk->group)
854 return -EACCES;
855
856 /* Block or return if any destination link is congested */
857 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
858 if (unlikely(rc))
859 return rc;
860
861 /* Lookup destination nodes */
862 tipc_nlist_init(&dsts, tipc_own_addr(net));
863 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts);
864 if (!dsts.local && !dsts.remote)
865 return -EHOSTUNREACH;
866
867 /* Build message header */
868 msg_set_type(hdr, TIPC_MCAST_MSG);
869 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
870 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
871 msg_set_destport(hdr, 0);
872 msg_set_destnode(hdr, 0);
873 msg_set_nametype(hdr, ua->sr.type);
874 msg_set_namelower(hdr, ua->sr.lower);
875 msg_set_nameupper(hdr, ua->sr.upper);
876
877 /* Build message as chain of buffers */
878 __skb_queue_head_init(&pkts);
879 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
880
881 /* Send message if build was successful */
882 if (unlikely(rc == dlen)) {
883 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
884 TIPC_DUMP_SK_SNDQ, " ");
885 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts,
886 &tsk->cong_link_cnt);
887 }
888
889 tipc_nlist_purge(&dsts);
890
891 return rc ? rc : dlen;
892}
893
894/**
895 * tipc_send_group_msg - send a message to a member in the group
896 * @net: network namespace
897 * @tsk: tipc socket
898 * @m: message to send
899 * @mb: group member
900 * @dnode: destination node
901 * @dport: destination port
902 * @dlen: total length of message data
903 */
904static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
905 struct msghdr *m, struct tipc_member *mb,
906 u32 dnode, u32 dport, int dlen)
907{
908 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
909 struct tipc_mc_method *method = &tsk->mc_method;
910 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
911 struct tipc_msg *hdr = &tsk->phdr;
912 struct sk_buff_head pkts;
913 int mtu, rc;
914
915 /* Complete message header */
916 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
917 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
918 msg_set_destport(hdr, dport);
919 msg_set_destnode(hdr, dnode);
920 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
921
922 /* Build message as chain of buffers */
923 __skb_queue_head_init(&pkts);
924 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
925 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
926 if (unlikely(rc != dlen))
927 return rc;
928
929 /* Send message */
930 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
931 if (unlikely(rc == -ELINKCONG)) {
932 tipc_dest_push(&tsk->cong_links, dnode, 0);
933 tsk->cong_link_cnt++;
934 }
935
936 /* Update send window */
937 tipc_group_update_member(mb, blks);
938
939 /* A broadcast sent within next EXPIRE period must follow same path */
940 method->rcast = true;
941 method->mandatory = true;
942 return dlen;
943}
944
945/**
946 * tipc_send_group_unicast - send message to a member in the group
947 * @sock: socket structure
948 * @m: message to send
949 * @dlen: total length of message data
950 * @timeout: timeout to wait for wakeup
951 *
952 * Called from function tipc_sendmsg(), which has done all sanity checks
953 * Return: the number of bytes sent on success, or errno
954 */
955static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
956 int dlen, long timeout)
957{
958 struct sock *sk = sock->sk;
959 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
960 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
961 struct tipc_sock *tsk = tipc_sk(sk);
962 struct net *net = sock_net(sk);
963 struct tipc_member *mb = NULL;
964 u32 node, port;
965 int rc;
966
967 node = ua->sk.node;
968 port = ua->sk.ref;
969 if (!port && !node)
970 return -EHOSTUNREACH;
971
972 /* Block or return if destination link or member is congested */
973 rc = tipc_wait_for_cond(sock, &timeout,
974 !tipc_dest_find(&tsk->cong_links, node, 0) &&
975 tsk->group &&
976 !tipc_group_cong(tsk->group, node, port, blks,
977 &mb));
978 if (unlikely(rc))
979 return rc;
980
981 if (unlikely(!mb))
982 return -EHOSTUNREACH;
983
984 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
985
986 return rc ? rc : dlen;
987}
988
989/**
990 * tipc_send_group_anycast - send message to any member with given identity
991 * @sock: socket structure
992 * @m: message to send
993 * @dlen: total length of message data
994 * @timeout: timeout to wait for wakeup
995 *
996 * Called from function tipc_sendmsg(), which has done all sanity checks
997 * Return: the number of bytes sent on success, or errno
998 */
999static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
1000 int dlen, long timeout)
1001{
1002 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1003 struct sock *sk = sock->sk;
1004 struct tipc_sock *tsk = tipc_sk(sk);
1005 struct list_head *cong_links = &tsk->cong_links;
1006 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
1007 struct tipc_msg *hdr = &tsk->phdr;
1008 struct tipc_member *first = NULL;
1009 struct tipc_member *mbr = NULL;
1010 struct net *net = sock_net(sk);
1011 u32 node, port, exclude;
1012 LIST_HEAD(dsts);
1013 int lookups = 0;
1014 int dstcnt, rc;
1015 bool cong;
1016
1017 ua->sa.type = msg_nametype(hdr);
1018 ua->scope = msg_lookup_scope(hdr);
1019
1020 while (++lookups < 4) {
1021 exclude = tipc_group_exclude(tsk->group);
1022
1023 first = NULL;
1024
1025 /* Look for a non-congested destination member, if any */
1026 while (1) {
1027 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1028 exclude, false))
1029 return -EHOSTUNREACH;
1030 tipc_dest_pop(&dsts, &node, &port);
1031 cong = tipc_group_cong(tsk->group, node, port, blks,
1032 &mbr);
1033 if (!cong)
1034 break;
1035 if (mbr == first)
1036 break;
1037 if (!first)
1038 first = mbr;
1039 }
1040
1041 /* Start over if destination was not in member list */
1042 if (unlikely(!mbr))
1043 continue;
1044
1045 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1046 break;
1047
1048 /* Block or return if destination link or member is congested */
1049 rc = tipc_wait_for_cond(sock, &timeout,
1050 !tipc_dest_find(cong_links, node, 0) &&
1051 tsk->group &&
1052 !tipc_group_cong(tsk->group, node, port,
1053 blks, &mbr));
1054 if (unlikely(rc))
1055 return rc;
1056
1057 /* Send, unless destination disappeared while waiting */
1058 if (likely(mbr))
1059 break;
1060 }
1061
1062 if (unlikely(lookups >= 4))
1063 return -EHOSTUNREACH;
1064
1065 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1066
1067 return rc ? rc : dlen;
1068}
1069
1070/**
1071 * tipc_send_group_bcast - send message to all members in communication group
1072 * @sock: socket structure
1073 * @m: message to send
1074 * @dlen: total length of message data
1075 * @timeout: timeout to wait for wakeup
1076 *
1077 * Called from function tipc_sendmsg(), which has done all sanity checks
1078 * Return: the number of bytes sent on success, or errno
1079 */
1080static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1081 int dlen, long timeout)
1082{
1083 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1084 struct sock *sk = sock->sk;
1085 struct net *net = sock_net(sk);
1086 struct tipc_sock *tsk = tipc_sk(sk);
1087 struct tipc_nlist *dsts;
1088 struct tipc_mc_method *method = &tsk->mc_method;
1089 bool ack = method->mandatory && method->rcast;
1090 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1091 struct tipc_msg *hdr = &tsk->phdr;
1092 int mtu = tipc_bcast_get_mtu(net);
1093 struct sk_buff_head pkts;
1094 int rc = -EHOSTUNREACH;
1095
1096 /* Block or return if any destination link or member is congested */
1097 rc = tipc_wait_for_cond(sock, &timeout,
1098 !tsk->cong_link_cnt && tsk->group &&
1099 !tipc_group_bc_cong(tsk->group, blks));
1100 if (unlikely(rc))
1101 return rc;
1102
1103 dsts = tipc_group_dests(tsk->group);
1104 if (!dsts->local && !dsts->remote)
1105 return -EHOSTUNREACH;
1106
1107 /* Complete message header */
1108 if (ua) {
1109 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1110 msg_set_nameinst(hdr, ua->sa.instance);
1111 } else {
1112 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1113 msg_set_nameinst(hdr, 0);
1114 }
1115 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1116 msg_set_destport(hdr, 0);
1117 msg_set_destnode(hdr, 0);
1118 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1119
1120 /* Avoid getting stuck with repeated forced replicasts */
1121 msg_set_grp_bc_ack_req(hdr, ack);
1122
1123 /* Build message as chain of buffers */
1124 __skb_queue_head_init(&pkts);
1125 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1126 if (unlikely(rc != dlen))
1127 return rc;
1128
1129 /* Send message */
1130 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1131 if (unlikely(rc))
1132 return rc;
1133
1134 /* Update broadcast sequence number and send windows */
1135 tipc_group_update_bc_members(tsk->group, blks, ack);
1136
1137 /* Broadcast link is now free to choose method for next broadcast */
1138 method->mandatory = false;
1139 method->expires = jiffies;
1140
1141 return dlen;
1142}
1143
1144/**
1145 * tipc_send_group_mcast - send message to all members with given identity
1146 * @sock: socket structure
1147 * @m: message to send
1148 * @dlen: total length of message data
1149 * @timeout: timeout to wait for wakeup
1150 *
1151 * Called from function tipc_sendmsg(), which has done all sanity checks
1152 * Return: the number of bytes sent on success, or errno
1153 */
1154static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1155 int dlen, long timeout)
1156{
1157 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1158 struct sock *sk = sock->sk;
1159 struct tipc_sock *tsk = tipc_sk(sk);
1160 struct tipc_group *grp = tsk->group;
1161 struct tipc_msg *hdr = &tsk->phdr;
1162 struct net *net = sock_net(sk);
1163 u32 dstcnt, exclude;
1164 LIST_HEAD(dsts);
1165
1166 ua->sa.type = msg_nametype(hdr);
1167 ua->scope = msg_lookup_scope(hdr);
1168 exclude = tipc_group_exclude(grp);
1169
1170 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1171 return -EHOSTUNREACH;
1172
1173 if (dstcnt == 1) {
1174 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1175 return tipc_send_group_unicast(sock, m, dlen, timeout);
1176 }
1177
1178 tipc_dest_list_purge(&dsts);
1179 return tipc_send_group_bcast(sock, m, dlen, timeout);
1180}
1181
1182/**
1183 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1184 * @net: the associated network namespace
1185 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1186 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1187 *
1188 * Multi-threaded: parallel calls with reference to same queues may occur
1189 */
1190void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1191 struct sk_buff_head *inputq)
1192{
1193 u32 self = tipc_own_addr(net);
1194 struct sk_buff *skb, *_skb;
1195 u32 portid, onode;
1196 struct sk_buff_head tmpq;
1197 struct list_head dports;
1198 struct tipc_msg *hdr;
1199 struct tipc_uaddr ua;
1200 int user, mtyp, hlen;
1201
1202 __skb_queue_head_init(&tmpq);
1203 INIT_LIST_HEAD(&dports);
1204 ua.addrtype = TIPC_SERVICE_RANGE;
1205
1206 /* tipc_skb_peek() increments the head skb's reference counter */
1207 skb = tipc_skb_peek(arrvq, &inputq->lock);
1208 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1209 hdr = buf_msg(skb);
1210 user = msg_user(hdr);
1211 mtyp = msg_type(hdr);
1212 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1213 onode = msg_orignode(hdr);
1214 ua.sr.type = msg_nametype(hdr);
1215 ua.sr.lower = msg_namelower(hdr);
1216 ua.sr.upper = msg_nameupper(hdr);
1217 if (onode == self)
1218 ua.scope = TIPC_ANY_SCOPE;
1219 else
1220 ua.scope = TIPC_CLUSTER_SCOPE;
1221
1222 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1223 spin_lock_bh(&inputq->lock);
1224 if (skb_peek(arrvq) == skb) {
1225 __skb_dequeue(arrvq);
1226 __skb_queue_tail(inputq, skb);
1227 }
1228 kfree_skb(skb);
1229 spin_unlock_bh(&inputq->lock);
1230 continue;
1231 }
1232
1233 /* Group messages require exact scope match */
1234 if (msg_in_group(hdr)) {
1235 ua.sr.lower = 0;
1236 ua.sr.upper = ~0;
1237 ua.scope = msg_lookup_scope(hdr);
1238 }
1239
1240 /* Create destination port list: */
1241 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1242
1243 /* Clone message per destination */
1244 while (tipc_dest_pop(&dports, NULL, &portid)) {
1245 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1246 if (_skb) {
1247 msg_set_destport(buf_msg(_skb), portid);
1248 __skb_queue_tail(&tmpq, _skb);
1249 continue;
1250 }
1251 pr_warn("Failed to clone mcast rcv buffer\n");
1252 }
1253 /* Append clones to inputq only if skb is still head of arrvq */
1254 spin_lock_bh(&inputq->lock);
1255 if (skb_peek(arrvq) == skb) {
1256 skb_queue_splice_tail_init(&tmpq, inputq);
1257 /* Decrement the skb's refcnt */
1258 kfree_skb(__skb_dequeue(arrvq));
1259 }
1260 spin_unlock_bh(&inputq->lock);
1261 __skb_queue_purge(&tmpq);
1262 kfree_skb(skb);
1263 }
1264 tipc_sk_rcv(net, inputq);
1265}
1266
1267/* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1268 * when socket is in Nagle mode
1269 */
1270static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1271{
1272 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1273 struct sk_buff *skb = skb_peek_tail(txq);
1274 struct net *net = sock_net(&tsk->sk);
1275 u32 dnode = tsk_peer_node(tsk);
1276 int rc;
1277
1278 if (nagle_ack) {
1279 tsk->pkt_cnt += skb_queue_len(txq);
1280 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1281 tsk->oneway = 0;
1282 if (tsk->nagle_start < NAGLE_START_MAX)
1283 tsk->nagle_start *= 2;
1284 tsk->expect_ack = false;
1285 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1286 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1287 tsk->nagle_start);
1288 } else {
1289 tsk->nagle_start = NAGLE_START_INIT;
1290 if (skb) {
1291 msg_set_ack_required(buf_msg(skb));
1292 tsk->expect_ack = true;
1293 } else {
1294 tsk->expect_ack = false;
1295 }
1296 }
1297 tsk->msg_acc = 0;
1298 tsk->pkt_cnt = 0;
1299 }
1300
1301 if (!skb || tsk->cong_link_cnt)
1302 return;
1303
1304 /* Do not send SYN again after congestion */
1305 if (msg_is_syn(buf_msg(skb)))
1306 return;
1307
1308 if (tsk->msg_acc)
1309 tsk->pkt_cnt += skb_queue_len(txq);
1310 tsk->snt_unacked += tsk->snd_backlog;
1311 tsk->snd_backlog = 0;
1312 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1313 if (rc == -ELINKCONG)
1314 tsk->cong_link_cnt = 1;
1315}
1316
1317/**
1318 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1319 * @tsk: receiving socket
1320 * @skb: pointer to message buffer.
1321 * @inputq: buffer list containing the buffers
1322 * @xmitq: output message area
1323 */
1324static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1325 struct sk_buff_head *inputq,
1326 struct sk_buff_head *xmitq)
1327{
1328 struct tipc_msg *hdr = buf_msg(skb);
1329 u32 onode = tsk_own_node(tsk);
1330 struct sock *sk = &tsk->sk;
1331 int mtyp = msg_type(hdr);
1332 bool was_cong;
1333
1334 /* Ignore if connection cannot be validated: */
1335 if (!tsk_peer_msg(tsk, hdr)) {
1336 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1337 goto exit;
1338 }
1339
1340 if (unlikely(msg_errcode(hdr))) {
1341 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1342 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1343 tsk_peer_port(tsk));
1344 sk->sk_state_change(sk);
1345
1346 /* State change is ignored if socket already awake,
1347 * - convert msg to abort msg and add to inqueue
1348 */
1349 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1350 msg_set_type(hdr, TIPC_CONN_MSG);
1351 msg_set_size(hdr, BASIC_H_SIZE);
1352 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1353 __skb_queue_tail(inputq, skb);
1354 return;
1355 }
1356
1357 tsk->probe_unacked = false;
1358
1359 if (mtyp == CONN_PROBE) {
1360 msg_set_type(hdr, CONN_PROBE_REPLY);
1361 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1362 __skb_queue_tail(xmitq, skb);
1363 return;
1364 } else if (mtyp == CONN_ACK) {
1365 was_cong = tsk_conn_cong(tsk);
1366 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1367 tsk->snt_unacked -= msg_conn_ack(hdr);
1368 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1369 tsk->snd_win = msg_adv_win(hdr);
1370 if (was_cong && !tsk_conn_cong(tsk))
1371 sk->sk_write_space(sk);
1372 } else if (mtyp != CONN_PROBE_REPLY) {
1373 pr_warn("Received unknown CONN_PROTO msg\n");
1374 }
1375exit:
1376 kfree_skb(skb);
1377}
1378
1379/**
1380 * tipc_sendmsg - send message in connectionless manner
1381 * @sock: socket structure
1382 * @m: message to send
1383 * @dsz: amount of user data to be sent
1384 *
1385 * Message must have an destination specified explicitly.
1386 * Used for SOCK_RDM and SOCK_DGRAM messages,
1387 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1388 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1389 *
1390 * Return: the number of bytes sent on success, or errno otherwise
1391 */
1392static int tipc_sendmsg(struct socket *sock,
1393 struct msghdr *m, size_t dsz)
1394{
1395 struct sock *sk = sock->sk;
1396 int ret;
1397
1398 lock_sock(sk);
1399 ret = __tipc_sendmsg(sock, m, dsz);
1400 release_sock(sk);
1401
1402 return ret;
1403}
1404
1405static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1406{
1407 struct sock *sk = sock->sk;
1408 struct net *net = sock_net(sk);
1409 struct tipc_sock *tsk = tipc_sk(sk);
1410 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1411 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1412 struct list_head *clinks = &tsk->cong_links;
1413 bool syn = !tipc_sk_type_connectionless(sk);
1414 struct tipc_group *grp = tsk->group;
1415 struct tipc_msg *hdr = &tsk->phdr;
1416 struct tipc_socket_addr skaddr;
1417 struct sk_buff_head pkts;
1418 int atype, mtu, rc;
1419
1420 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1421 return -EMSGSIZE;
1422
1423 if (ua) {
1424 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1425 return -EINVAL;
1426 atype = ua->addrtype;
1427 }
1428
1429 /* If socket belongs to a communication group follow other paths */
1430 if (grp) {
1431 if (!ua)
1432 return tipc_send_group_bcast(sock, m, dlen, timeout);
1433 if (atype == TIPC_SERVICE_ADDR)
1434 return tipc_send_group_anycast(sock, m, dlen, timeout);
1435 if (atype == TIPC_SOCKET_ADDR)
1436 return tipc_send_group_unicast(sock, m, dlen, timeout);
1437 if (atype == TIPC_SERVICE_RANGE)
1438 return tipc_send_group_mcast(sock, m, dlen, timeout);
1439 return -EINVAL;
1440 }
1441
1442 if (!ua) {
1443 ua = (struct tipc_uaddr *)&tsk->peer;
1444 if (!syn && ua->family != AF_TIPC)
1445 return -EDESTADDRREQ;
1446 atype = ua->addrtype;
1447 }
1448
1449 if (unlikely(syn)) {
1450 if (sk->sk_state == TIPC_LISTEN)
1451 return -EPIPE;
1452 if (sk->sk_state != TIPC_OPEN)
1453 return -EISCONN;
1454 if (tsk->published)
1455 return -EOPNOTSUPP;
1456 if (atype == TIPC_SERVICE_ADDR)
1457 tsk->conn_addrtype = atype;
1458 msg_set_syn(hdr, 1);
1459 }
1460
1461 memset(&skaddr, 0, sizeof(skaddr));
1462
1463 /* Determine destination */
1464 if (atype == TIPC_SERVICE_RANGE) {
1465 return tipc_sendmcast(sock, ua, m, dlen, timeout);
1466 } else if (atype == TIPC_SERVICE_ADDR) {
1467 skaddr.node = ua->lookup_node;
1468 ua->scope = tipc_node2scope(skaddr.node);
1469 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr))
1470 return -EHOSTUNREACH;
1471 } else if (atype == TIPC_SOCKET_ADDR) {
1472 skaddr = ua->sk;
1473 } else {
1474 return -EINVAL;
1475 }
1476
1477 /* Block or return if destination link is congested */
1478 rc = tipc_wait_for_cond(sock, &timeout,
1479 !tipc_dest_find(clinks, skaddr.node, 0));
1480 if (unlikely(rc))
1481 return rc;
1482
1483 /* Finally build message header */
1484 msg_set_destnode(hdr, skaddr.node);
1485 msg_set_destport(hdr, skaddr.ref);
1486 if (atype == TIPC_SERVICE_ADDR) {
1487 msg_set_type(hdr, TIPC_NAMED_MSG);
1488 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1489 msg_set_nametype(hdr, ua->sa.type);
1490 msg_set_nameinst(hdr, ua->sa.instance);
1491 msg_set_lookup_scope(hdr, ua->scope);
1492 } else { /* TIPC_SOCKET_ADDR */
1493 msg_set_type(hdr, TIPC_DIRECT_MSG);
1494 msg_set_lookup_scope(hdr, 0);
1495 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1496 }
1497
1498 /* Add message body */
1499 __skb_queue_head_init(&pkts);
1500 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
1501 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1502 if (unlikely(rc != dlen))
1503 return rc;
1504 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1505 __skb_queue_purge(&pkts);
1506 return -ENOMEM;
1507 }
1508
1509 /* Send message */
1510 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1511 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid);
1512 if (unlikely(rc == -ELINKCONG)) {
1513 tipc_dest_push(clinks, skaddr.node, 0);
1514 tsk->cong_link_cnt++;
1515 rc = 0;
1516 }
1517
1518 if (unlikely(syn && !rc)) {
1519 tipc_set_sk_state(sk, TIPC_CONNECTING);
1520 if (dlen && timeout) {
1521 timeout = msecs_to_jiffies(timeout);
1522 tipc_wait_for_connect(sock, &timeout);
1523 }
1524 }
1525
1526 return rc ? rc : dlen;
1527}
1528
1529/**
1530 * tipc_sendstream - send stream-oriented data
1531 * @sock: socket structure
1532 * @m: data to send
1533 * @dsz: total length of data to be transmitted
1534 *
1535 * Used for SOCK_STREAM data.
1536 *
1537 * Return: the number of bytes sent on success (or partial success),
1538 * or errno if no data sent
1539 */
1540static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1541{
1542 struct sock *sk = sock->sk;
1543 int ret;
1544
1545 lock_sock(sk);
1546 ret = __tipc_sendstream(sock, m, dsz);
1547 release_sock(sk);
1548
1549 return ret;
1550}
1551
1552static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1553{
1554 struct sock *sk = sock->sk;
1555 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1556 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1557 struct sk_buff_head *txq = &sk->sk_write_queue;
1558 struct tipc_sock *tsk = tipc_sk(sk);
1559 struct tipc_msg *hdr = &tsk->phdr;
1560 struct net *net = sock_net(sk);
1561 struct sk_buff *skb;
1562 u32 dnode = tsk_peer_node(tsk);
1563 int maxnagle = tsk->maxnagle;
1564 int maxpkt = tsk->max_pkt;
1565 int send, sent = 0;
1566 int blocks, rc = 0;
1567
1568 if (unlikely(dlen > INT_MAX))
1569 return -EMSGSIZE;
1570
1571 /* Handle implicit connection setup */
1572 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) {
1573 rc = __tipc_sendmsg(sock, m, dlen);
1574 if (dlen && dlen == rc) {
1575 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1576 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1577 }
1578 return rc;
1579 }
1580
1581 do {
1582 rc = tipc_wait_for_cond(sock, &timeout,
1583 (!tsk->cong_link_cnt &&
1584 !tsk_conn_cong(tsk) &&
1585 tipc_sk_connected(sk)));
1586 if (unlikely(rc))
1587 break;
1588 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1589 blocks = tsk->snd_backlog;
1590 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1591 send <= maxnagle) {
1592 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1593 if (unlikely(rc < 0))
1594 break;
1595 blocks += rc;
1596 tsk->msg_acc++;
1597 if (blocks <= 64 && tsk->expect_ack) {
1598 tsk->snd_backlog = blocks;
1599 sent += send;
1600 break;
1601 } else if (blocks > 64) {
1602 tsk->pkt_cnt += skb_queue_len(txq);
1603 } else {
1604 skb = skb_peek_tail(txq);
1605 if (skb) {
1606 msg_set_ack_required(buf_msg(skb));
1607 tsk->expect_ack = true;
1608 } else {
1609 tsk->expect_ack = false;
1610 }
1611 tsk->msg_acc = 0;
1612 tsk->pkt_cnt = 0;
1613 }
1614 } else {
1615 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1616 if (unlikely(rc != send))
1617 break;
1618 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1619 }
1620 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1621 TIPC_DUMP_SK_SNDQ, " ");
1622 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1623 if (unlikely(rc == -ELINKCONG)) {
1624 tsk->cong_link_cnt = 1;
1625 rc = 0;
1626 }
1627 if (likely(!rc)) {
1628 tsk->snt_unacked += blocks;
1629 tsk->snd_backlog = 0;
1630 sent += send;
1631 }
1632 } while (sent < dlen && !rc);
1633
1634 return sent ? sent : rc;
1635}
1636
1637/**
1638 * tipc_send_packet - send a connection-oriented message
1639 * @sock: socket structure
1640 * @m: message to send
1641 * @dsz: length of data to be transmitted
1642 *
1643 * Used for SOCK_SEQPACKET messages.
1644 *
1645 * Return: the number of bytes sent on success, or errno otherwise
1646 */
1647static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1648{
1649 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1650 return -EMSGSIZE;
1651
1652 return tipc_sendstream(sock, m, dsz);
1653}
1654
1655/* tipc_sk_finish_conn - complete the setup of a connection
1656 */
1657static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1658 u32 peer_node)
1659{
1660 struct sock *sk = &tsk->sk;
1661 struct net *net = sock_net(sk);
1662 struct tipc_msg *msg = &tsk->phdr;
1663
1664 msg_set_syn(msg, 0);
1665 msg_set_destnode(msg, peer_node);
1666 msg_set_destport(msg, peer_port);
1667 msg_set_type(msg, TIPC_CONN_MSG);
1668 msg_set_lookup_scope(msg, 0);
1669 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1670
1671 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1672 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1673 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1674 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1675 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1676 tsk_set_nagle(tsk);
1677 __skb_queue_purge(&sk->sk_write_queue);
1678 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1679 return;
1680
1681 /* Fall back to message based flow control */
1682 tsk->rcv_win = FLOWCTL_MSG_WIN;
1683 tsk->snd_win = FLOWCTL_MSG_WIN;
1684}
1685
1686/**
1687 * tipc_sk_set_orig_addr - capture sender's address for received message
1688 * @m: descriptor for message info
1689 * @skb: received message
1690 *
1691 * Note: Address is not captured if not requested by receiver.
1692 */
1693static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1694{
1695 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1696 struct tipc_msg *hdr = buf_msg(skb);
1697
1698 if (!srcaddr)
1699 return;
1700
1701 srcaddr->sock.family = AF_TIPC;
1702 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1703 srcaddr->sock.scope = 0;
1704 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1705 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1706 srcaddr->sock.addr.name.domain = 0;
1707 m->msg_namelen = sizeof(struct sockaddr_tipc);
1708
1709 if (!msg_in_group(hdr))
1710 return;
1711
1712 /* Group message users may also want to know sending member's id */
1713 srcaddr->member.family = AF_TIPC;
1714 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1715 srcaddr->member.scope = 0;
1716 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1717 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1718 srcaddr->member.addr.name.domain = 0;
1719 m->msg_namelen = sizeof(*srcaddr);
1720}
1721
1722/**
1723 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1724 * @m: descriptor for message info
1725 * @skb: received message buffer
1726 * @tsk: TIPC port associated with message
1727 *
1728 * Note: Ancillary data is not captured if not requested by receiver.
1729 *
1730 * Return: 0 if successful, otherwise errno
1731 */
1732static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1733 struct tipc_sock *tsk)
1734{
1735 struct tipc_msg *hdr;
1736 u32 data[3] = {0,};
1737 bool has_addr;
1738 int dlen, rc;
1739
1740 if (likely(m->msg_controllen == 0))
1741 return 0;
1742
1743 hdr = buf_msg(skb);
1744 dlen = msg_data_sz(hdr);
1745
1746 /* Capture errored message object, if any */
1747 if (msg_errcode(hdr)) {
1748 if (skb_linearize(skb))
1749 return -ENOMEM;
1750 hdr = buf_msg(skb);
1751 data[0] = msg_errcode(hdr);
1752 data[1] = dlen;
1753 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1754 if (rc || !dlen)
1755 return rc;
1756 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1757 if (rc)
1758 return rc;
1759 }
1760
1761 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1762 switch (msg_type(hdr)) {
1763 case TIPC_NAMED_MSG:
1764 has_addr = true;
1765 data[0] = msg_nametype(hdr);
1766 data[1] = msg_namelower(hdr);
1767 data[2] = data[1];
1768 break;
1769 case TIPC_MCAST_MSG:
1770 has_addr = true;
1771 data[0] = msg_nametype(hdr);
1772 data[1] = msg_namelower(hdr);
1773 data[2] = msg_nameupper(hdr);
1774 break;
1775 case TIPC_CONN_MSG:
1776 has_addr = !!tsk->conn_addrtype;
1777 data[0] = msg_nametype(&tsk->phdr);
1778 data[1] = msg_nameinst(&tsk->phdr);
1779 data[2] = data[1];
1780 break;
1781 default:
1782 has_addr = false;
1783 }
1784 if (!has_addr)
1785 return 0;
1786 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1787}
1788
1789static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1790{
1791 struct sock *sk = &tsk->sk;
1792 struct sk_buff *skb = NULL;
1793 struct tipc_msg *msg;
1794 u32 peer_port = tsk_peer_port(tsk);
1795 u32 dnode = tsk_peer_node(tsk);
1796
1797 if (!tipc_sk_connected(sk))
1798 return NULL;
1799 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1800 dnode, tsk_own_node(tsk), peer_port,
1801 tsk->portid, TIPC_OK);
1802 if (!skb)
1803 return NULL;
1804 msg = buf_msg(skb);
1805 msg_set_conn_ack(msg, tsk->rcv_unacked);
1806 tsk->rcv_unacked = 0;
1807
1808 /* Adjust to and advertize the correct window limit */
1809 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1810 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1811 msg_set_adv_win(msg, tsk->rcv_win);
1812 }
1813 return skb;
1814}
1815
1816static void tipc_sk_send_ack(struct tipc_sock *tsk)
1817{
1818 struct sk_buff *skb;
1819
1820 skb = tipc_sk_build_ack(tsk);
1821 if (!skb)
1822 return;
1823
1824 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1825 msg_link_selector(buf_msg(skb)));
1826}
1827
1828static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1829{
1830 struct sock *sk = sock->sk;
1831 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1832 long timeo = *timeop;
1833 int err = sock_error(sk);
1834
1835 if (err)
1836 return err;
1837
1838 for (;;) {
1839 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1840 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1841 err = -ENOTCONN;
1842 break;
1843 }
1844 add_wait_queue(sk_sleep(sk), &wait);
1845 release_sock(sk);
1846 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1847 sched_annotate_sleep();
1848 lock_sock(sk);
1849 remove_wait_queue(sk_sleep(sk), &wait);
1850 }
1851 err = 0;
1852 if (!skb_queue_empty(&sk->sk_receive_queue))
1853 break;
1854 err = -EAGAIN;
1855 if (!timeo)
1856 break;
1857 err = sock_intr_errno(timeo);
1858 if (signal_pending(current))
1859 break;
1860
1861 err = sock_error(sk);
1862 if (err)
1863 break;
1864 }
1865 *timeop = timeo;
1866 return err;
1867}
1868
1869/**
1870 * tipc_recvmsg - receive packet-oriented message
1871 * @sock: network socket
1872 * @m: descriptor for message info
1873 * @buflen: length of user buffer area
1874 * @flags: receive flags
1875 *
1876 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1877 * If the complete message doesn't fit in user area, truncate it.
1878 *
1879 * Return: size of returned message data, errno otherwise
1880 */
1881static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1882 size_t buflen, int flags)
1883{
1884 struct sock *sk = sock->sk;
1885 bool connected = !tipc_sk_type_connectionless(sk);
1886 struct tipc_sock *tsk = tipc_sk(sk);
1887 int rc, err, hlen, dlen, copy;
1888 struct tipc_skb_cb *skb_cb;
1889 struct sk_buff_head xmitq;
1890 struct tipc_msg *hdr;
1891 struct sk_buff *skb;
1892 bool grp_evt;
1893 long timeout;
1894
1895 /* Catch invalid receive requests */
1896 if (unlikely(!buflen))
1897 return -EINVAL;
1898
1899 lock_sock(sk);
1900 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1901 rc = -ENOTCONN;
1902 goto exit;
1903 }
1904 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1905
1906 /* Step rcv queue to first msg with data or error; wait if necessary */
1907 do {
1908 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1909 if (unlikely(rc))
1910 goto exit;
1911 skb = skb_peek(&sk->sk_receive_queue);
1912 skb_cb = TIPC_SKB_CB(skb);
1913 hdr = buf_msg(skb);
1914 dlen = msg_data_sz(hdr);
1915 hlen = msg_hdr_sz(hdr);
1916 err = msg_errcode(hdr);
1917 grp_evt = msg_is_grp_evt(hdr);
1918 if (likely(dlen || err))
1919 break;
1920 tsk_advance_rx_queue(sk);
1921 } while (1);
1922
1923 /* Collect msg meta data, including error code and rejected data */
1924 tipc_sk_set_orig_addr(m, skb);
1925 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1926 if (unlikely(rc))
1927 goto exit;
1928 hdr = buf_msg(skb);
1929
1930 /* Capture data if non-error msg, otherwise just set return value */
1931 if (likely(!err)) {
1932 int offset = skb_cb->bytes_read;
1933
1934 copy = min_t(int, dlen - offset, buflen);
1935 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1936 if (unlikely(rc))
1937 goto exit;
1938 if (unlikely(offset + copy < dlen)) {
1939 if (flags & MSG_EOR) {
1940 if (!(flags & MSG_PEEK))
1941 skb_cb->bytes_read = offset + copy;
1942 } else {
1943 m->msg_flags |= MSG_TRUNC;
1944 skb_cb->bytes_read = 0;
1945 }
1946 } else {
1947 if (flags & MSG_EOR)
1948 m->msg_flags |= MSG_EOR;
1949 skb_cb->bytes_read = 0;
1950 }
1951 } else {
1952 copy = 0;
1953 rc = 0;
1954 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) {
1955 rc = -ECONNRESET;
1956 goto exit;
1957 }
1958 }
1959
1960 /* Mark message as group event if applicable */
1961 if (unlikely(grp_evt)) {
1962 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1963 m->msg_flags |= MSG_EOR;
1964 m->msg_flags |= MSG_OOB;
1965 copy = 0;
1966 }
1967
1968 /* Caption of data or error code/rejected data was successful */
1969 if (unlikely(flags & MSG_PEEK))
1970 goto exit;
1971
1972 /* Send group flow control advertisement when applicable */
1973 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1974 __skb_queue_head_init(&xmitq);
1975 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1976 msg_orignode(hdr), msg_origport(hdr),
1977 &xmitq);
1978 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1979 }
1980
1981 if (skb_cb->bytes_read)
1982 goto exit;
1983
1984 tsk_advance_rx_queue(sk);
1985
1986 if (likely(!connected))
1987 goto exit;
1988
1989 /* Send connection flow control advertisement when applicable */
1990 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1991 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1992 tipc_sk_send_ack(tsk);
1993exit:
1994 release_sock(sk);
1995 return rc ? rc : copy;
1996}
1997
1998/**
1999 * tipc_recvstream - receive stream-oriented data
2000 * @sock: network socket
2001 * @m: descriptor for message info
2002 * @buflen: total size of user buffer area
2003 * @flags: receive flags
2004 *
2005 * Used for SOCK_STREAM messages only. If not enough data is available
2006 * will optionally wait for more; never truncates data.
2007 *
2008 * Return: size of returned message data, errno otherwise
2009 */
2010static int tipc_recvstream(struct socket *sock, struct msghdr *m,
2011 size_t buflen, int flags)
2012{
2013 struct sock *sk = sock->sk;
2014 struct tipc_sock *tsk = tipc_sk(sk);
2015 struct sk_buff *skb;
2016 struct tipc_msg *hdr;
2017 struct tipc_skb_cb *skb_cb;
2018 bool peek = flags & MSG_PEEK;
2019 int offset, required, copy, copied = 0;
2020 int hlen, dlen, err, rc;
2021 long timeout;
2022
2023 /* Catch invalid receive attempts */
2024 if (unlikely(!buflen))
2025 return -EINVAL;
2026
2027 lock_sock(sk);
2028
2029 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2030 rc = -ENOTCONN;
2031 goto exit;
2032 }
2033 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2034 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2035
2036 do {
2037 /* Look at first msg in receive queue; wait if necessary */
2038 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2039 if (unlikely(rc))
2040 break;
2041 skb = skb_peek(&sk->sk_receive_queue);
2042 skb_cb = TIPC_SKB_CB(skb);
2043 hdr = buf_msg(skb);
2044 dlen = msg_data_sz(hdr);
2045 hlen = msg_hdr_sz(hdr);
2046 err = msg_errcode(hdr);
2047
2048 /* Discard any empty non-errored (SYN-) message */
2049 if (unlikely(!dlen && !err)) {
2050 tsk_advance_rx_queue(sk);
2051 continue;
2052 }
2053
2054 /* Collect msg meta data, incl. error code and rejected data */
2055 if (!copied) {
2056 tipc_sk_set_orig_addr(m, skb);
2057 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2058 if (rc)
2059 break;
2060 hdr = buf_msg(skb);
2061 }
2062
2063 /* Copy data if msg ok, otherwise return error/partial data */
2064 if (likely(!err)) {
2065 offset = skb_cb->bytes_read;
2066 copy = min_t(int, dlen - offset, buflen - copied);
2067 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2068 if (unlikely(rc))
2069 break;
2070 copied += copy;
2071 offset += copy;
2072 if (unlikely(offset < dlen)) {
2073 if (!peek)
2074 skb_cb->bytes_read = offset;
2075 break;
2076 }
2077 } else {
2078 rc = 0;
2079 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2080 rc = -ECONNRESET;
2081 if (copied || rc)
2082 break;
2083 }
2084
2085 if (unlikely(peek))
2086 break;
2087
2088 tsk_advance_rx_queue(sk);
2089
2090 /* Send connection flow control advertisement when applicable */
2091 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2092 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2093 tipc_sk_send_ack(tsk);
2094
2095 /* Exit if all requested data or FIN/error received */
2096 if (copied == buflen || err)
2097 break;
2098
2099 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2100exit:
2101 release_sock(sk);
2102 return copied ? copied : rc;
2103}
2104
2105/**
2106 * tipc_write_space - wake up thread if port congestion is released
2107 * @sk: socket
2108 */
2109static void tipc_write_space(struct sock *sk)
2110{
2111 struct socket_wq *wq;
2112
2113 rcu_read_lock();
2114 wq = rcu_dereference(sk->sk_wq);
2115 if (skwq_has_sleeper(wq))
2116 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2117 EPOLLWRNORM | EPOLLWRBAND);
2118 rcu_read_unlock();
2119}
2120
2121/**
2122 * tipc_data_ready - wake up threads to indicate messages have been received
2123 * @sk: socket
2124 */
2125static void tipc_data_ready(struct sock *sk)
2126{
2127 struct socket_wq *wq;
2128
2129 trace_sk_data_ready(sk);
2130
2131 rcu_read_lock();
2132 wq = rcu_dereference(sk->sk_wq);
2133 if (skwq_has_sleeper(wq))
2134 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2135 EPOLLRDNORM | EPOLLRDBAND);
2136 rcu_read_unlock();
2137}
2138
2139static void tipc_sock_destruct(struct sock *sk)
2140{
2141 __skb_queue_purge(&sk->sk_receive_queue);
2142}
2143
2144static void tipc_sk_proto_rcv(struct sock *sk,
2145 struct sk_buff_head *inputq,
2146 struct sk_buff_head *xmitq)
2147{
2148 struct sk_buff *skb = __skb_dequeue(inputq);
2149 struct tipc_sock *tsk = tipc_sk(sk);
2150 struct tipc_msg *hdr = buf_msg(skb);
2151 struct tipc_group *grp = tsk->group;
2152 bool wakeup = false;
2153
2154 switch (msg_user(hdr)) {
2155 case CONN_MANAGER:
2156 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2157 return;
2158 case SOCK_WAKEUP:
2159 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2160 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2161 smp_wmb();
2162 tsk->cong_link_cnt--;
2163 wakeup = true;
2164 tipc_sk_push_backlog(tsk, false);
2165 break;
2166 case GROUP_PROTOCOL:
2167 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2168 break;
2169 case TOP_SRV:
2170 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2171 hdr, inputq, xmitq);
2172 break;
2173 default:
2174 break;
2175 }
2176
2177 if (wakeup)
2178 sk->sk_write_space(sk);
2179
2180 kfree_skb(skb);
2181}
2182
2183/**
2184 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2185 * @tsk: TIPC socket
2186 * @skb: pointer to message buffer.
2187 * @xmitq: for Nagle ACK if any
2188 * Return: true if message should be added to receive queue, false otherwise
2189 */
2190static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2191 struct sk_buff_head *xmitq)
2192{
2193 struct sock *sk = &tsk->sk;
2194 struct net *net = sock_net(sk);
2195 struct tipc_msg *hdr = buf_msg(skb);
2196 bool con_msg = msg_connected(hdr);
2197 u32 pport = tsk_peer_port(tsk);
2198 u32 pnode = tsk_peer_node(tsk);
2199 u32 oport = msg_origport(hdr);
2200 u32 onode = msg_orignode(hdr);
2201 int err = msg_errcode(hdr);
2202 unsigned long delay;
2203
2204 if (unlikely(msg_mcast(hdr)))
2205 return false;
2206 tsk->oneway = 0;
2207
2208 switch (sk->sk_state) {
2209 case TIPC_CONNECTING:
2210 /* Setup ACK */
2211 if (likely(con_msg)) {
2212 if (err)
2213 break;
2214 tipc_sk_finish_conn(tsk, oport, onode);
2215 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2216 /* ACK+ message with data is added to receive queue */
2217 if (msg_data_sz(hdr))
2218 return true;
2219 /* Empty ACK-, - wake up sleeping connect() and drop */
2220 sk->sk_state_change(sk);
2221 msg_set_dest_droppable(hdr, 1);
2222 return false;
2223 }
2224 /* Ignore connectionless message if not from listening socket */
2225 if (oport != pport || onode != pnode)
2226 return false;
2227
2228 /* Rejected SYN */
2229 if (err != TIPC_ERR_OVERLOAD)
2230 break;
2231
2232 /* Prepare for new setup attempt if we have a SYN clone */
2233 if (skb_queue_empty(&sk->sk_write_queue))
2234 break;
2235 get_random_bytes(&delay, 2);
2236 delay %= (tsk->conn_timeout / 4);
2237 delay = msecs_to_jiffies(delay + 100);
2238 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2239 return false;
2240 case TIPC_OPEN:
2241 case TIPC_DISCONNECTING:
2242 return false;
2243 case TIPC_LISTEN:
2244 /* Accept only SYN message */
2245 if (!msg_is_syn(hdr) &&
2246 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2247 return false;
2248 if (!con_msg && !err)
2249 return true;
2250 return false;
2251 case TIPC_ESTABLISHED:
2252 if (!skb_queue_empty(&sk->sk_write_queue))
2253 tipc_sk_push_backlog(tsk, false);
2254 /* Accept only connection-based messages sent by peer */
2255 if (likely(con_msg && !err && pport == oport &&
2256 pnode == onode)) {
2257 if (msg_ack_required(hdr)) {
2258 struct sk_buff *skb;
2259
2260 skb = tipc_sk_build_ack(tsk);
2261 if (skb) {
2262 msg_set_nagle_ack(buf_msg(skb));
2263 __skb_queue_tail(xmitq, skb);
2264 }
2265 }
2266 return true;
2267 }
2268 if (!tsk_peer_msg(tsk, hdr))
2269 return false;
2270 if (!err)
2271 return true;
2272 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2273 tipc_node_remove_conn(net, pnode, tsk->portid);
2274 sk->sk_state_change(sk);
2275 return true;
2276 default:
2277 pr_err("Unknown sk_state %u\n", sk->sk_state);
2278 }
2279 /* Abort connection setup attempt */
2280 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2281 sk->sk_err = ECONNREFUSED;
2282 sk->sk_state_change(sk);
2283 return true;
2284}
2285
2286/**
2287 * rcvbuf_limit - get proper overload limit of socket receive queue
2288 * @sk: socket
2289 * @skb: message
2290 *
2291 * For connection oriented messages, irrespective of importance,
2292 * default queue limit is 2 MB.
2293 *
2294 * For connectionless messages, queue limits are based on message
2295 * importance as follows:
2296 *
2297 * TIPC_LOW_IMPORTANCE (2 MB)
2298 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2299 * TIPC_HIGH_IMPORTANCE (8 MB)
2300 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2301 *
2302 * Return: overload limit according to corresponding message importance
2303 */
2304static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2305{
2306 struct tipc_sock *tsk = tipc_sk(sk);
2307 struct tipc_msg *hdr = buf_msg(skb);
2308
2309 if (unlikely(msg_in_group(hdr)))
2310 return READ_ONCE(sk->sk_rcvbuf);
2311
2312 if (unlikely(!msg_connected(hdr)))
2313 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2314
2315 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2316 return READ_ONCE(sk->sk_rcvbuf);
2317
2318 return FLOWCTL_MSG_LIM;
2319}
2320
2321/**
2322 * tipc_sk_filter_rcv - validate incoming message
2323 * @sk: socket
2324 * @skb: pointer to message.
2325 * @xmitq: output message area (FIXME)
2326 *
2327 * Enqueues message on receive queue if acceptable; optionally handles
2328 * disconnect indication for a connected socket.
2329 *
2330 * Called with socket lock already taken
2331 */
2332static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2333 struct sk_buff_head *xmitq)
2334{
2335 bool sk_conn = !tipc_sk_type_connectionless(sk);
2336 struct tipc_sock *tsk = tipc_sk(sk);
2337 struct tipc_group *grp = tsk->group;
2338 struct tipc_msg *hdr = buf_msg(skb);
2339 struct net *net = sock_net(sk);
2340 struct sk_buff_head inputq;
2341 int mtyp = msg_type(hdr);
2342 int limit, err = TIPC_OK;
2343
2344 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2345 TIPC_SKB_CB(skb)->bytes_read = 0;
2346 __skb_queue_head_init(&inputq);
2347 __skb_queue_tail(&inputq, skb);
2348
2349 if (unlikely(!msg_isdata(hdr)))
2350 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2351
2352 if (unlikely(grp))
2353 tipc_group_filter_msg(grp, &inputq, xmitq);
2354
2355 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2356 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2357
2358 /* Validate and add to receive buffer if there is space */
2359 while ((skb = __skb_dequeue(&inputq))) {
2360 hdr = buf_msg(skb);
2361 limit = rcvbuf_limit(sk, skb);
2362 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2363 (!sk_conn && msg_connected(hdr)) ||
2364 (!grp && msg_in_group(hdr)))
2365 err = TIPC_ERR_NO_PORT;
2366 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2367 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2368 "err_overload2!");
2369 atomic_inc(&sk->sk_drops);
2370 err = TIPC_ERR_OVERLOAD;
2371 }
2372
2373 if (unlikely(err)) {
2374 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2375 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2376 "@filter_rcv!");
2377 __skb_queue_tail(xmitq, skb);
2378 }
2379 err = TIPC_OK;
2380 continue;
2381 }
2382 __skb_queue_tail(&sk->sk_receive_queue, skb);
2383 skb_set_owner_r(skb, sk);
2384 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2385 "rcvq >90% allocated!");
2386 sk->sk_data_ready(sk);
2387 }
2388}
2389
2390/**
2391 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2392 * @sk: socket
2393 * @skb: message
2394 *
2395 * Caller must hold socket lock
2396 */
2397static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2398{
2399 unsigned int before = sk_rmem_alloc_get(sk);
2400 struct sk_buff_head xmitq;
2401 unsigned int added;
2402
2403 __skb_queue_head_init(&xmitq);
2404
2405 tipc_sk_filter_rcv(sk, skb, &xmitq);
2406 added = sk_rmem_alloc_get(sk) - before;
2407 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2408
2409 /* Send pending response/rejected messages, if any */
2410 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2411 return 0;
2412}
2413
2414/**
2415 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2416 * inputq and try adding them to socket or backlog queue
2417 * @inputq: list of incoming buffers with potentially different destinations
2418 * @sk: socket where the buffers should be enqueued
2419 * @dport: port number for the socket
2420 * @xmitq: output queue
2421 *
2422 * Caller must hold socket lock
2423 */
2424static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2425 u32 dport, struct sk_buff_head *xmitq)
2426{
2427 unsigned long time_limit = jiffies + usecs_to_jiffies(20000);
2428 struct sk_buff *skb;
2429 unsigned int lim;
2430 atomic_t *dcnt;
2431 u32 onode;
2432
2433 while (skb_queue_len(inputq)) {
2434 if (unlikely(time_after_eq(jiffies, time_limit)))
2435 return;
2436
2437 skb = tipc_skb_dequeue(inputq, dport);
2438 if (unlikely(!skb))
2439 return;
2440
2441 /* Add message directly to receive queue if possible */
2442 if (!sock_owned_by_user(sk)) {
2443 tipc_sk_filter_rcv(sk, skb, xmitq);
2444 continue;
2445 }
2446
2447 /* Try backlog, compensating for double-counted bytes */
2448 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2449 if (!sk->sk_backlog.len)
2450 atomic_set(dcnt, 0);
2451 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2452 if (likely(!sk_add_backlog(sk, skb, lim))) {
2453 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2454 "bklg & rcvq >90% allocated!");
2455 continue;
2456 }
2457
2458 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2459 /* Overload => reject message back to sender */
2460 onode = tipc_own_addr(sock_net(sk));
2461 atomic_inc(&sk->sk_drops);
2462 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2463 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2464 "@sk_enqueue!");
2465 __skb_queue_tail(xmitq, skb);
2466 }
2467 break;
2468 }
2469}
2470
2471/**
2472 * tipc_sk_rcv - handle a chain of incoming buffers
2473 * @net: the associated network namespace
2474 * @inputq: buffer list containing the buffers
2475 * Consumes all buffers in list until inputq is empty
2476 * Note: may be called in multiple threads referring to the same queue
2477 */
2478void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2479{
2480 struct sk_buff_head xmitq;
2481 u32 dnode, dport = 0;
2482 int err;
2483 struct tipc_sock *tsk;
2484 struct sock *sk;
2485 struct sk_buff *skb;
2486
2487 __skb_queue_head_init(&xmitq);
2488 while (skb_queue_len(inputq)) {
2489 dport = tipc_skb_peek_port(inputq, dport);
2490 tsk = tipc_sk_lookup(net, dport);
2491
2492 if (likely(tsk)) {
2493 sk = &tsk->sk;
2494 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2495 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2496 spin_unlock_bh(&sk->sk_lock.slock);
2497 }
2498 /* Send pending response/rejected messages, if any */
2499 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2500 sock_put(sk);
2501 continue;
2502 }
2503 /* No destination socket => dequeue skb if still there */
2504 skb = tipc_skb_dequeue(inputq, dport);
2505 if (!skb)
2506 return;
2507
2508 /* Try secondary lookup if unresolved named message */
2509 err = TIPC_ERR_NO_PORT;
2510 if (tipc_msg_lookup_dest(net, skb, &err))
2511 goto xmit;
2512
2513 /* Prepare for message rejection */
2514 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2515 continue;
2516
2517 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2518xmit:
2519 dnode = msg_destnode(buf_msg(skb));
2520 tipc_node_xmit_skb(net, skb, dnode, dport);
2521 }
2522}
2523
2524static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2525{
2526 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2527 struct sock *sk = sock->sk;
2528 int done;
2529
2530 do {
2531 int err = sock_error(sk);
2532 if (err)
2533 return err;
2534 if (!*timeo_p)
2535 return -ETIMEDOUT;
2536 if (signal_pending(current))
2537 return sock_intr_errno(*timeo_p);
2538 if (sk->sk_state == TIPC_DISCONNECTING)
2539 break;
2540
2541 add_wait_queue(sk_sleep(sk), &wait);
2542 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2543 &wait);
2544 remove_wait_queue(sk_sleep(sk), &wait);
2545 } while (!done);
2546 return 0;
2547}
2548
2549static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2550{
2551 if (addr->family != AF_TIPC)
2552 return false;
2553 if (addr->addrtype == TIPC_SERVICE_RANGE)
2554 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2555 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2556 addr->addrtype == TIPC_SOCKET_ADDR);
2557}
2558
2559/**
2560 * tipc_connect - establish a connection to another TIPC port
2561 * @sock: socket structure
2562 * @dest: socket address for destination port
2563 * @destlen: size of socket address data structure
2564 * @flags: file-related flags associated with socket
2565 *
2566 * Return: 0 on success, errno otherwise
2567 */
2568static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2569 int destlen, int flags)
2570{
2571 struct sock *sk = sock->sk;
2572 struct tipc_sock *tsk = tipc_sk(sk);
2573 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2574 struct msghdr m = {NULL,};
2575 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2576 int previous;
2577 int res = 0;
2578
2579 if (destlen != sizeof(struct sockaddr_tipc))
2580 return -EINVAL;
2581
2582 lock_sock(sk);
2583
2584 if (tsk->group) {
2585 res = -EINVAL;
2586 goto exit;
2587 }
2588
2589 if (dst->family == AF_UNSPEC) {
2590 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2591 if (!tipc_sk_type_connectionless(sk))
2592 res = -EINVAL;
2593 goto exit;
2594 }
2595 if (!tipc_sockaddr_is_sane(dst)) {
2596 res = -EINVAL;
2597 goto exit;
2598 }
2599 /* DGRAM/RDM connect(), just save the destaddr */
2600 if (tipc_sk_type_connectionless(sk)) {
2601 memcpy(&tsk->peer, dest, destlen);
2602 goto exit;
2603 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2604 res = -EINVAL;
2605 goto exit;
2606 }
2607
2608 previous = sk->sk_state;
2609
2610 switch (sk->sk_state) {
2611 case TIPC_OPEN:
2612 /* Send a 'SYN-' to destination */
2613 m.msg_name = dest;
2614 m.msg_namelen = destlen;
2615 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2616
2617 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2618 * indicate send_msg() is never blocked.
2619 */
2620 if (!timeout)
2621 m.msg_flags = MSG_DONTWAIT;
2622
2623 res = __tipc_sendmsg(sock, &m, 0);
2624 if ((res < 0) && (res != -EWOULDBLOCK))
2625 goto exit;
2626
2627 /* Just entered TIPC_CONNECTING state; the only
2628 * difference is that return value in non-blocking
2629 * case is EINPROGRESS, rather than EALREADY.
2630 */
2631 res = -EINPROGRESS;
2632 fallthrough;
2633 case TIPC_CONNECTING:
2634 if (!timeout) {
2635 if (previous == TIPC_CONNECTING)
2636 res = -EALREADY;
2637 goto exit;
2638 }
2639 timeout = msecs_to_jiffies(timeout);
2640 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2641 res = tipc_wait_for_connect(sock, &timeout);
2642 break;
2643 case TIPC_ESTABLISHED:
2644 res = -EISCONN;
2645 break;
2646 default:
2647 res = -EINVAL;
2648 }
2649
2650exit:
2651 release_sock(sk);
2652 return res;
2653}
2654
2655/**
2656 * tipc_listen - allow socket to listen for incoming connections
2657 * @sock: socket structure
2658 * @len: (unused)
2659 *
2660 * Return: 0 on success, errno otherwise
2661 */
2662static int tipc_listen(struct socket *sock, int len)
2663{
2664 struct sock *sk = sock->sk;
2665 int res;
2666
2667 lock_sock(sk);
2668 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2669 release_sock(sk);
2670
2671 return res;
2672}
2673
2674static int tipc_wait_for_accept(struct socket *sock, long timeo)
2675{
2676 struct sock *sk = sock->sk;
2677 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2678 int err;
2679
2680 /* True wake-one mechanism for incoming connections: only
2681 * one process gets woken up, not the 'whole herd'.
2682 * Since we do not 'race & poll' for established sockets
2683 * anymore, the common case will execute the loop only once.
2684 */
2685 for (;;) {
2686 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2687 add_wait_queue(sk_sleep(sk), &wait);
2688 release_sock(sk);
2689 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
2690 lock_sock(sk);
2691 remove_wait_queue(sk_sleep(sk), &wait);
2692 }
2693 err = 0;
2694 if (!skb_queue_empty(&sk->sk_receive_queue))
2695 break;
2696 err = -EAGAIN;
2697 if (!timeo)
2698 break;
2699 err = sock_intr_errno(timeo);
2700 if (signal_pending(current))
2701 break;
2702 }
2703 return err;
2704}
2705
2706/**
2707 * tipc_accept - wait for connection request
2708 * @sock: listening socket
2709 * @new_sock: new socket that is to be connected
2710 * @arg: arguments for accept
2711 *
2712 * Return: 0 on success, errno otherwise
2713 */
2714static int tipc_accept(struct socket *sock, struct socket *new_sock,
2715 struct proto_accept_arg *arg)
2716{
2717 struct sock *new_sk, *sk = sock->sk;
2718 struct tipc_sock *new_tsock;
2719 struct msghdr m = {NULL,};
2720 struct tipc_msg *msg;
2721 struct sk_buff *buf;
2722 long timeo;
2723 int res;
2724
2725 lock_sock(sk);
2726
2727 if (sk->sk_state != TIPC_LISTEN) {
2728 res = -EINVAL;
2729 goto exit;
2730 }
2731 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
2732 res = tipc_wait_for_accept(sock, timeo);
2733 if (res)
2734 goto exit;
2735
2736 buf = skb_peek(&sk->sk_receive_queue);
2737
2738 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, arg->kern);
2739 if (res)
2740 goto exit;
2741 security_sk_clone(sock->sk, new_sock->sk);
2742
2743 new_sk = new_sock->sk;
2744 new_tsock = tipc_sk(new_sk);
2745 msg = buf_msg(buf);
2746
2747 /* we lock on new_sk; but lockdep sees the lock on sk */
2748 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2749
2750 /*
2751 * Reject any stray messages received by new socket
2752 * before the socket lock was taken (very, very unlikely)
2753 */
2754 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2755
2756 /* Connect new socket to it's peer */
2757 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2758
2759 tsk_set_importance(new_sk, msg_importance(msg));
2760 if (msg_named(msg)) {
2761 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2762 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2763 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2764 }
2765
2766 /*
2767 * Respond to 'SYN-' by discarding it & returning 'ACK'.
2768 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'.
2769 */
2770 if (!msg_data_sz(msg)) {
2771 tsk_advance_rx_queue(sk);
2772 } else {
2773 __skb_dequeue(&sk->sk_receive_queue);
2774 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2775 skb_set_owner_r(buf, new_sk);
2776 }
2777 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2778 __tipc_sendstream(new_sock, &m, 0);
2779 release_sock(new_sk);
2780exit:
2781 release_sock(sk);
2782 return res;
2783}
2784
2785/**
2786 * tipc_shutdown - shutdown socket connection
2787 * @sock: socket structure
2788 * @how: direction to close (must be SHUT_RDWR)
2789 *
2790 * Terminates connection (if necessary), then purges socket's receive queue.
2791 *
2792 * Return: 0 on success, errno otherwise
2793 */
2794static int tipc_shutdown(struct socket *sock, int how)
2795{
2796 struct sock *sk = sock->sk;
2797 int res;
2798
2799 if (how != SHUT_RDWR)
2800 return -EINVAL;
2801
2802 lock_sock(sk);
2803
2804 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2805 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2806 sk->sk_shutdown = SHUTDOWN_MASK;
2807
2808 if (sk->sk_state == TIPC_DISCONNECTING) {
2809 /* Discard any unreceived messages */
2810 __skb_queue_purge(&sk->sk_receive_queue);
2811
2812 res = 0;
2813 } else {
2814 res = -ENOTCONN;
2815 }
2816 /* Wake up anyone sleeping in poll. */
2817 sk->sk_state_change(sk);
2818
2819 release_sock(sk);
2820 return res;
2821}
2822
2823static void tipc_sk_check_probing_state(struct sock *sk,
2824 struct sk_buff_head *list)
2825{
2826 struct tipc_sock *tsk = tipc_sk(sk);
2827 u32 pnode = tsk_peer_node(tsk);
2828 u32 pport = tsk_peer_port(tsk);
2829 u32 self = tsk_own_node(tsk);
2830 u32 oport = tsk->portid;
2831 struct sk_buff *skb;
2832
2833 if (tsk->probe_unacked) {
2834 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2835 sk->sk_err = ECONNABORTED;
2836 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2837 sk->sk_state_change(sk);
2838 return;
2839 }
2840 /* Prepare new probe */
2841 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2842 pnode, self, pport, oport, TIPC_OK);
2843 if (skb)
2844 __skb_queue_tail(list, skb);
2845 tsk->probe_unacked = true;
2846 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2847}
2848
2849static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2850{
2851 struct tipc_sock *tsk = tipc_sk(sk);
2852
2853 /* Try again later if dest link is congested */
2854 if (tsk->cong_link_cnt) {
2855 sk_reset_timer(sk, &sk->sk_timer,
2856 jiffies + msecs_to_jiffies(100));
2857 return;
2858 }
2859 /* Prepare SYN for retransmit */
2860 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2861}
2862
2863static void tipc_sk_timeout(struct timer_list *t)
2864{
2865 struct sock *sk = from_timer(sk, t, sk_timer);
2866 struct tipc_sock *tsk = tipc_sk(sk);
2867 u32 pnode = tsk_peer_node(tsk);
2868 struct sk_buff_head list;
2869 int rc = 0;
2870
2871 __skb_queue_head_init(&list);
2872 bh_lock_sock(sk);
2873
2874 /* Try again later if socket is busy */
2875 if (sock_owned_by_user(sk)) {
2876 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2877 bh_unlock_sock(sk);
2878 sock_put(sk);
2879 return;
2880 }
2881
2882 if (sk->sk_state == TIPC_ESTABLISHED)
2883 tipc_sk_check_probing_state(sk, &list);
2884 else if (sk->sk_state == TIPC_CONNECTING)
2885 tipc_sk_retry_connect(sk, &list);
2886
2887 bh_unlock_sock(sk);
2888
2889 if (!skb_queue_empty(&list))
2890 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2891
2892 /* SYN messages may cause link congestion */
2893 if (rc == -ELINKCONG) {
2894 tipc_dest_push(&tsk->cong_links, pnode, 0);
2895 tsk->cong_link_cnt = 1;
2896 }
2897 sock_put(sk);
2898}
2899
2900static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2901{
2902 struct sock *sk = &tsk->sk;
2903 struct net *net = sock_net(sk);
2904 struct tipc_socket_addr skaddr;
2905 struct publication *p;
2906 u32 key;
2907
2908 if (tipc_sk_connected(sk))
2909 return -EINVAL;
2910 key = tsk->portid + tsk->pub_count + 1;
2911 if (key == tsk->portid)
2912 return -EADDRINUSE;
2913 skaddr.ref = tsk->portid;
2914 skaddr.node = tipc_own_addr(net);
2915 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2916 if (unlikely(!p))
2917 return -EINVAL;
2918
2919 list_add(&p->binding_sock, &tsk->publications);
2920 tsk->pub_count++;
2921 tsk->published = true;
2922 return 0;
2923}
2924
2925static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2926{
2927 struct net *net = sock_net(&tsk->sk);
2928 struct publication *safe, *p;
2929 struct tipc_uaddr _ua;
2930 int rc = -EINVAL;
2931
2932 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2933 if (!ua) {
2934 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2935 p->sr.type, p->sr.lower, p->sr.upper);
2936 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2937 continue;
2938 }
2939 /* Unbind specific publication */
2940 if (p->scope != ua->scope)
2941 continue;
2942 if (p->sr.type != ua->sr.type)
2943 continue;
2944 if (p->sr.lower != ua->sr.lower)
2945 continue;
2946 if (p->sr.upper != ua->sr.upper)
2947 break;
2948 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2949 rc = 0;
2950 break;
2951 }
2952 if (list_empty(&tsk->publications)) {
2953 tsk->published = 0;
2954 rc = 0;
2955 }
2956 return rc;
2957}
2958
2959/* tipc_sk_reinit: set non-zero address in all existing sockets
2960 * when we go from standalone to network mode.
2961 */
2962void tipc_sk_reinit(struct net *net)
2963{
2964 struct tipc_net *tn = net_generic(net, tipc_net_id);
2965 struct rhashtable_iter iter;
2966 struct tipc_sock *tsk;
2967 struct tipc_msg *msg;
2968
2969 rhashtable_walk_enter(&tn->sk_rht, &iter);
2970
2971 do {
2972 rhashtable_walk_start(&iter);
2973
2974 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2975 sock_hold(&tsk->sk);
2976 rhashtable_walk_stop(&iter);
2977 lock_sock(&tsk->sk);
2978 msg = &tsk->phdr;
2979 msg_set_prevnode(msg, tipc_own_addr(net));
2980 msg_set_orignode(msg, tipc_own_addr(net));
2981 release_sock(&tsk->sk);
2982 rhashtable_walk_start(&iter);
2983 sock_put(&tsk->sk);
2984 }
2985
2986 rhashtable_walk_stop(&iter);
2987 } while (tsk == ERR_PTR(-EAGAIN));
2988
2989 rhashtable_walk_exit(&iter);
2990}
2991
2992static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2993{
2994 struct tipc_net *tn = net_generic(net, tipc_net_id);
2995 struct tipc_sock *tsk;
2996
2997 rcu_read_lock();
2998 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
2999 if (tsk)
3000 sock_hold(&tsk->sk);
3001 rcu_read_unlock();
3002
3003 return tsk;
3004}
3005
3006static int tipc_sk_insert(struct tipc_sock *tsk)
3007{
3008 struct sock *sk = &tsk->sk;
3009 struct net *net = sock_net(sk);
3010 struct tipc_net *tn = net_generic(net, tipc_net_id);
3011 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
3012 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT;
3013
3014 while (remaining--) {
3015 portid++;
3016 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
3017 portid = TIPC_MIN_PORT;
3018 tsk->portid = portid;
3019 sock_hold(&tsk->sk);
3020 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3021 tsk_rht_params))
3022 return 0;
3023 sock_put(&tsk->sk);
3024 }
3025
3026 return -1;
3027}
3028
3029static void tipc_sk_remove(struct tipc_sock *tsk)
3030{
3031 struct sock *sk = &tsk->sk;
3032 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3033
3034 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3035 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3036 __sock_put(sk);
3037 }
3038}
3039
3040static const struct rhashtable_params tsk_rht_params = {
3041 .nelem_hint = 192,
3042 .head_offset = offsetof(struct tipc_sock, node),
3043 .key_offset = offsetof(struct tipc_sock, portid),
3044 .key_len = sizeof(u32), /* portid */
3045 .max_size = 1048576,
3046 .min_size = 256,
3047 .automatic_shrinking = true,
3048};
3049
3050int tipc_sk_rht_init(struct net *net)
3051{
3052 struct tipc_net *tn = net_generic(net, tipc_net_id);
3053
3054 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3055}
3056
3057void tipc_sk_rht_destroy(struct net *net)
3058{
3059 struct tipc_net *tn = net_generic(net, tipc_net_id);
3060
3061 /* Wait for socket readers to complete */
3062 synchronize_net();
3063
3064 rhashtable_destroy(&tn->sk_rht);
3065}
3066
3067static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3068{
3069 struct net *net = sock_net(&tsk->sk);
3070 struct tipc_group *grp = tsk->group;
3071 struct tipc_msg *hdr = &tsk->phdr;
3072 struct tipc_uaddr ua;
3073 int rc;
3074
3075 if (mreq->type < TIPC_RESERVED_TYPES)
3076 return -EACCES;
3077 if (mreq->scope > TIPC_NODE_SCOPE)
3078 return -EINVAL;
3079 if (mreq->scope != TIPC_NODE_SCOPE)
3080 mreq->scope = TIPC_CLUSTER_SCOPE;
3081 if (grp)
3082 return -EACCES;
3083 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3084 if (!grp)
3085 return -ENOMEM;
3086 tsk->group = grp;
3087 msg_set_lookup_scope(hdr, mreq->scope);
3088 msg_set_nametype(hdr, mreq->type);
3089 msg_set_dest_droppable(hdr, true);
3090 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3091 mreq->type, mreq->instance, mreq->instance);
3092 tipc_nametbl_build_group(net, grp, &ua);
3093 rc = tipc_sk_publish(tsk, &ua);
3094 if (rc) {
3095 tipc_group_delete(net, grp);
3096 tsk->group = NULL;
3097 return rc;
3098 }
3099 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3100 tsk->mc_method.rcast = true;
3101 tsk->mc_method.mandatory = true;
3102 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3103 return rc;
3104}
3105
3106static int tipc_sk_leave(struct tipc_sock *tsk)
3107{
3108 struct net *net = sock_net(&tsk->sk);
3109 struct tipc_group *grp = tsk->group;
3110 struct tipc_uaddr ua;
3111 int scope;
3112
3113 if (!grp)
3114 return -EINVAL;
3115 ua.addrtype = TIPC_SERVICE_RANGE;
3116 tipc_group_self(grp, &ua.sr, &scope);
3117 ua.scope = scope;
3118 tipc_group_delete(net, grp);
3119 tsk->group = NULL;
3120 tipc_sk_withdraw(tsk, &ua);
3121 return 0;
3122}
3123
3124/**
3125 * tipc_setsockopt - set socket option
3126 * @sock: socket structure
3127 * @lvl: option level
3128 * @opt: option identifier
3129 * @ov: pointer to new option value
3130 * @ol: length of option value
3131 *
3132 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3133 * (to ease compatibility).
3134 *
3135 * Return: 0 on success, errno otherwise
3136 */
3137static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3138 sockptr_t ov, unsigned int ol)
3139{
3140 struct sock *sk = sock->sk;
3141 struct tipc_sock *tsk = tipc_sk(sk);
3142 struct tipc_group_req mreq;
3143 u32 value = 0;
3144 int res = 0;
3145
3146 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3147 return 0;
3148 if (lvl != SOL_TIPC)
3149 return -ENOPROTOOPT;
3150
3151 switch (opt) {
3152 case TIPC_IMPORTANCE:
3153 case TIPC_SRC_DROPPABLE:
3154 case TIPC_DEST_DROPPABLE:
3155 case TIPC_CONN_TIMEOUT:
3156 case TIPC_NODELAY:
3157 if (ol < sizeof(value))
3158 return -EINVAL;
3159 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3160 return -EFAULT;
3161 break;
3162 case TIPC_GROUP_JOIN:
3163 if (ol < sizeof(mreq))
3164 return -EINVAL;
3165 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3166 return -EFAULT;
3167 break;
3168 default:
3169 if (!sockptr_is_null(ov) || ol)
3170 return -EINVAL;
3171 }
3172
3173 lock_sock(sk);
3174
3175 switch (opt) {
3176 case TIPC_IMPORTANCE:
3177 res = tsk_set_importance(sk, value);
3178 break;
3179 case TIPC_SRC_DROPPABLE:
3180 if (sock->type != SOCK_STREAM)
3181 tsk_set_unreliable(tsk, value);
3182 else
3183 res = -ENOPROTOOPT;
3184 break;
3185 case TIPC_DEST_DROPPABLE:
3186 tsk_set_unreturnable(tsk, value);
3187 break;
3188 case TIPC_CONN_TIMEOUT:
3189 tipc_sk(sk)->conn_timeout = value;
3190 break;
3191 case TIPC_MCAST_BROADCAST:
3192 tsk->mc_method.rcast = false;
3193 tsk->mc_method.mandatory = true;
3194 break;
3195 case TIPC_MCAST_REPLICAST:
3196 tsk->mc_method.rcast = true;
3197 tsk->mc_method.mandatory = true;
3198 break;
3199 case TIPC_GROUP_JOIN:
3200 res = tipc_sk_join(tsk, &mreq);
3201 break;
3202 case TIPC_GROUP_LEAVE:
3203 res = tipc_sk_leave(tsk);
3204 break;
3205 case TIPC_NODELAY:
3206 tsk->nodelay = !!value;
3207 tsk_set_nagle(tsk);
3208 break;
3209 default:
3210 res = -EINVAL;
3211 }
3212
3213 release_sock(sk);
3214
3215 return res;
3216}
3217
3218/**
3219 * tipc_getsockopt - get socket option
3220 * @sock: socket structure
3221 * @lvl: option level
3222 * @opt: option identifier
3223 * @ov: receptacle for option value
3224 * @ol: receptacle for length of option value
3225 *
3226 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3227 * (to ease compatibility).
3228 *
3229 * Return: 0 on success, errno otherwise
3230 */
3231static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3232 char __user *ov, int __user *ol)
3233{
3234 struct sock *sk = sock->sk;
3235 struct tipc_sock *tsk = tipc_sk(sk);
3236 struct tipc_service_range seq;
3237 int len, scope;
3238 u32 value;
3239 int res;
3240
3241 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3242 return put_user(0, ol);
3243 if (lvl != SOL_TIPC)
3244 return -ENOPROTOOPT;
3245 res = get_user(len, ol);
3246 if (res)
3247 return res;
3248
3249 lock_sock(sk);
3250
3251 switch (opt) {
3252 case TIPC_IMPORTANCE:
3253 value = tsk_importance(tsk);
3254 break;
3255 case TIPC_SRC_DROPPABLE:
3256 value = tsk_unreliable(tsk);
3257 break;
3258 case TIPC_DEST_DROPPABLE:
3259 value = tsk_unreturnable(tsk);
3260 break;
3261 case TIPC_CONN_TIMEOUT:
3262 value = tsk->conn_timeout;
3263 /* no need to set "res", since already 0 at this point */
3264 break;
3265 case TIPC_NODE_RECVQ_DEPTH:
3266 value = 0; /* was tipc_queue_size, now obsolete */
3267 break;
3268 case TIPC_SOCK_RECVQ_DEPTH:
3269 value = skb_queue_len(&sk->sk_receive_queue);
3270 break;
3271 case TIPC_SOCK_RECVQ_USED:
3272 value = sk_rmem_alloc_get(sk);
3273 break;
3274 case TIPC_GROUP_JOIN:
3275 seq.type = 0;
3276 if (tsk->group)
3277 tipc_group_self(tsk->group, &seq, &scope);
3278 value = seq.type;
3279 break;
3280 default:
3281 res = -EINVAL;
3282 }
3283
3284 release_sock(sk);
3285
3286 if (res)
3287 return res; /* "get" failed */
3288
3289 if (len < sizeof(value))
3290 return -EINVAL;
3291
3292 if (copy_to_user(ov, &value, sizeof(value)))
3293 return -EFAULT;
3294
3295 return put_user(sizeof(value), ol);
3296}
3297
3298static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3299{
3300 struct net *net = sock_net(sock->sk);
3301 struct tipc_sioc_nodeid_req nr = {0};
3302 struct tipc_sioc_ln_req lnr;
3303 void __user *argp = (void __user *)arg;
3304
3305 switch (cmd) {
3306 case SIOCGETLINKNAME:
3307 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3308 return -EFAULT;
3309 if (!tipc_node_get_linkname(net,
3310 lnr.bearer_id & 0xffff, lnr.peer,
3311 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3312 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3313 return -EFAULT;
3314 return 0;
3315 }
3316 return -EADDRNOTAVAIL;
3317 case SIOCGETNODEID:
3318 if (copy_from_user(&nr, argp, sizeof(nr)))
3319 return -EFAULT;
3320 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3321 return -EADDRNOTAVAIL;
3322 if (copy_to_user(argp, &nr, sizeof(nr)))
3323 return -EFAULT;
3324 return 0;
3325 default:
3326 return -ENOIOCTLCMD;
3327 }
3328}
3329
3330static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3331{
3332 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3333 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3334 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3335
3336 tsk1->peer.family = AF_TIPC;
3337 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3338 tsk1->peer.scope = TIPC_NODE_SCOPE;
3339 tsk1->peer.addr.id.ref = tsk2->portid;
3340 tsk1->peer.addr.id.node = onode;
3341 tsk2->peer.family = AF_TIPC;
3342 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3343 tsk2->peer.scope = TIPC_NODE_SCOPE;
3344 tsk2->peer.addr.id.ref = tsk1->portid;
3345 tsk2->peer.addr.id.node = onode;
3346
3347 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3348 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3349 return 0;
3350}
3351
3352/* Protocol switches for the various types of TIPC sockets */
3353
3354static const struct proto_ops msg_ops = {
3355 .owner = THIS_MODULE,
3356 .family = AF_TIPC,
3357 .release = tipc_release,
3358 .bind = tipc_bind,
3359 .connect = tipc_connect,
3360 .socketpair = tipc_socketpair,
3361 .accept = sock_no_accept,
3362 .getname = tipc_getname,
3363 .poll = tipc_poll,
3364 .ioctl = tipc_ioctl,
3365 .listen = sock_no_listen,
3366 .shutdown = tipc_shutdown,
3367 .setsockopt = tipc_setsockopt,
3368 .getsockopt = tipc_getsockopt,
3369 .sendmsg = tipc_sendmsg,
3370 .recvmsg = tipc_recvmsg,
3371 .mmap = sock_no_mmap,
3372};
3373
3374static const struct proto_ops packet_ops = {
3375 .owner = THIS_MODULE,
3376 .family = AF_TIPC,
3377 .release = tipc_release,
3378 .bind = tipc_bind,
3379 .connect = tipc_connect,
3380 .socketpair = tipc_socketpair,
3381 .accept = tipc_accept,
3382 .getname = tipc_getname,
3383 .poll = tipc_poll,
3384 .ioctl = tipc_ioctl,
3385 .listen = tipc_listen,
3386 .shutdown = tipc_shutdown,
3387 .setsockopt = tipc_setsockopt,
3388 .getsockopt = tipc_getsockopt,
3389 .sendmsg = tipc_send_packet,
3390 .recvmsg = tipc_recvmsg,
3391 .mmap = sock_no_mmap,
3392};
3393
3394static const struct proto_ops stream_ops = {
3395 .owner = THIS_MODULE,
3396 .family = AF_TIPC,
3397 .release = tipc_release,
3398 .bind = tipc_bind,
3399 .connect = tipc_connect,
3400 .socketpair = tipc_socketpair,
3401 .accept = tipc_accept,
3402 .getname = tipc_getname,
3403 .poll = tipc_poll,
3404 .ioctl = tipc_ioctl,
3405 .listen = tipc_listen,
3406 .shutdown = tipc_shutdown,
3407 .setsockopt = tipc_setsockopt,
3408 .getsockopt = tipc_getsockopt,
3409 .sendmsg = tipc_sendstream,
3410 .recvmsg = tipc_recvstream,
3411 .mmap = sock_no_mmap,
3412};
3413
3414static const struct net_proto_family tipc_family_ops = {
3415 .owner = THIS_MODULE,
3416 .family = AF_TIPC,
3417 .create = tipc_sk_create
3418};
3419
3420static struct proto tipc_proto = {
3421 .name = "TIPC",
3422 .owner = THIS_MODULE,
3423 .obj_size = sizeof(struct tipc_sock),
3424 .sysctl_rmem = sysctl_tipc_rmem
3425};
3426
3427/**
3428 * tipc_socket_init - initialize TIPC socket interface
3429 *
3430 * Return: 0 on success, errno otherwise
3431 */
3432int tipc_socket_init(void)
3433{
3434 int res;
3435
3436 res = proto_register(&tipc_proto, 1);
3437 if (res) {
3438 pr_err("Failed to register TIPC protocol type\n");
3439 goto out;
3440 }
3441
3442 res = sock_register(&tipc_family_ops);
3443 if (res) {
3444 pr_err("Failed to register TIPC socket type\n");
3445 proto_unregister(&tipc_proto);
3446 goto out;
3447 }
3448 out:
3449 return res;
3450}
3451
3452/**
3453 * tipc_socket_stop - stop TIPC socket interface
3454 */
3455void tipc_socket_stop(void)
3456{
3457 sock_unregister(tipc_family_ops.family);
3458 proto_unregister(&tipc_proto);
3459}
3460
3461/* Caller should hold socket lock for the passed tipc socket. */
3462static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3463{
3464 u32 peer_node, peer_port;
3465 u32 conn_type, conn_instance;
3466 struct nlattr *nest;
3467
3468 peer_node = tsk_peer_node(tsk);
3469 peer_port = tsk_peer_port(tsk);
3470 conn_type = msg_nametype(&tsk->phdr);
3471 conn_instance = msg_nameinst(&tsk->phdr);
3472 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3473 if (!nest)
3474 return -EMSGSIZE;
3475
3476 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3477 goto msg_full;
3478 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3479 goto msg_full;
3480
3481 if (tsk->conn_addrtype != 0) {
3482 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3483 goto msg_full;
3484 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3485 goto msg_full;
3486 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3487 goto msg_full;
3488 }
3489 nla_nest_end(skb, nest);
3490
3491 return 0;
3492
3493msg_full:
3494 nla_nest_cancel(skb, nest);
3495
3496 return -EMSGSIZE;
3497}
3498
3499static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3500 *tsk)
3501{
3502 struct net *net = sock_net(skb->sk);
3503 struct sock *sk = &tsk->sk;
3504
3505 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3506 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3507 return -EMSGSIZE;
3508
3509 if (tipc_sk_connected(sk)) {
3510 if (__tipc_nl_add_sk_con(skb, tsk))
3511 return -EMSGSIZE;
3512 } else if (!list_empty(&tsk->publications)) {
3513 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3514 return -EMSGSIZE;
3515 }
3516 return 0;
3517}
3518
3519/* Caller should hold socket lock for the passed tipc socket. */
3520static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3521 struct tipc_sock *tsk)
3522{
3523 struct nlattr *attrs;
3524 void *hdr;
3525
3526 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3527 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3528 if (!hdr)
3529 goto msg_cancel;
3530
3531 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3532 if (!attrs)
3533 goto genlmsg_cancel;
3534
3535 if (__tipc_nl_add_sk_info(skb, tsk))
3536 goto attr_msg_cancel;
3537
3538 nla_nest_end(skb, attrs);
3539 genlmsg_end(skb, hdr);
3540
3541 return 0;
3542
3543attr_msg_cancel:
3544 nla_nest_cancel(skb, attrs);
3545genlmsg_cancel:
3546 genlmsg_cancel(skb, hdr);
3547msg_cancel:
3548 return -EMSGSIZE;
3549}
3550
3551int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3552 int (*skb_handler)(struct sk_buff *skb,
3553 struct netlink_callback *cb,
3554 struct tipc_sock *tsk))
3555{
3556 struct rhashtable_iter *iter = (void *)cb->args[4];
3557 struct tipc_sock *tsk;
3558 int err;
3559
3560 rhashtable_walk_start(iter);
3561 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3562 if (IS_ERR(tsk)) {
3563 if (PTR_ERR(tsk) == -EAGAIN)
3564 continue;
3565 break;
3566 }
3567
3568 sock_hold(&tsk->sk);
3569 rhashtable_walk_stop(iter);
3570 lock_sock(&tsk->sk);
3571 err = skb_handler(skb, cb, tsk);
3572 if (err) {
3573 release_sock(&tsk->sk);
3574 sock_put(&tsk->sk);
3575 goto out;
3576 }
3577 release_sock(&tsk->sk);
3578 rhashtable_walk_start(iter);
3579 sock_put(&tsk->sk);
3580 }
3581 rhashtable_walk_stop(iter);
3582out:
3583 return skb->len;
3584}
3585EXPORT_SYMBOL(tipc_nl_sk_walk);
3586
3587int tipc_dump_start(struct netlink_callback *cb)
3588{
3589 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3590}
3591EXPORT_SYMBOL(tipc_dump_start);
3592
3593int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3594{
3595 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3596 struct rhashtable_iter *iter = (void *)cb->args[4];
3597 struct tipc_net *tn = tipc_net(net);
3598
3599 if (!iter) {
3600 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3601 if (!iter)
3602 return -ENOMEM;
3603
3604 cb->args[4] = (long)iter;
3605 }
3606
3607 rhashtable_walk_enter(&tn->sk_rht, iter);
3608 return 0;
3609}
3610
3611int tipc_dump_done(struct netlink_callback *cb)
3612{
3613 struct rhashtable_iter *hti = (void *)cb->args[4];
3614
3615 rhashtable_walk_exit(hti);
3616 kfree(hti);
3617 return 0;
3618}
3619EXPORT_SYMBOL(tipc_dump_done);
3620
3621int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3622 struct tipc_sock *tsk, u32 sk_filter_state,
3623 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3624{
3625 struct sock *sk = &tsk->sk;
3626 struct nlattr *attrs;
3627 struct nlattr *stat;
3628
3629 /*filter response w.r.t sk_state*/
3630 if (!(sk_filter_state & (1 << sk->sk_state)))
3631 return 0;
3632
3633 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3634 if (!attrs)
3635 goto msg_cancel;
3636
3637 if (__tipc_nl_add_sk_info(skb, tsk))
3638 goto attr_msg_cancel;
3639
3640 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3641 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3642 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3643 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3644 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3645 sock_i_uid(sk))) ||
3646 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3647 tipc_diag_gen_cookie(sk),
3648 TIPC_NLA_SOCK_PAD))
3649 goto attr_msg_cancel;
3650
3651 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3652 if (!stat)
3653 goto attr_msg_cancel;
3654
3655 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3656 skb_queue_len(&sk->sk_receive_queue)) ||
3657 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3658 skb_queue_len(&sk->sk_write_queue)) ||
3659 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3660 atomic_read(&sk->sk_drops)))
3661 goto stat_msg_cancel;
3662
3663 if (tsk->cong_link_cnt &&
3664 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3665 goto stat_msg_cancel;
3666
3667 if (tsk_conn_cong(tsk) &&
3668 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3669 goto stat_msg_cancel;
3670
3671 nla_nest_end(skb, stat);
3672
3673 if (tsk->group)
3674 if (tipc_group_fill_sock_diag(tsk->group, skb))
3675 goto stat_msg_cancel;
3676
3677 nla_nest_end(skb, attrs);
3678
3679 return 0;
3680
3681stat_msg_cancel:
3682 nla_nest_cancel(skb, stat);
3683attr_msg_cancel:
3684 nla_nest_cancel(skb, attrs);
3685msg_cancel:
3686 return -EMSGSIZE;
3687}
3688EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3689
3690int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3691{
3692 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3693}
3694
3695/* Caller should hold socket lock for the passed tipc socket. */
3696static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3697 struct netlink_callback *cb,
3698 struct publication *publ)
3699{
3700 void *hdr;
3701 struct nlattr *attrs;
3702
3703 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3704 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3705 if (!hdr)
3706 goto msg_cancel;
3707
3708 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3709 if (!attrs)
3710 goto genlmsg_cancel;
3711
3712 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3713 goto attr_msg_cancel;
3714 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3715 goto attr_msg_cancel;
3716 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3717 goto attr_msg_cancel;
3718 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3719 goto attr_msg_cancel;
3720
3721 nla_nest_end(skb, attrs);
3722 genlmsg_end(skb, hdr);
3723
3724 return 0;
3725
3726attr_msg_cancel:
3727 nla_nest_cancel(skb, attrs);
3728genlmsg_cancel:
3729 genlmsg_cancel(skb, hdr);
3730msg_cancel:
3731 return -EMSGSIZE;
3732}
3733
3734/* Caller should hold socket lock for the passed tipc socket. */
3735static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3736 struct netlink_callback *cb,
3737 struct tipc_sock *tsk, u32 *last_publ)
3738{
3739 int err;
3740 struct publication *p;
3741
3742 if (*last_publ) {
3743 list_for_each_entry(p, &tsk->publications, binding_sock) {
3744 if (p->key == *last_publ)
3745 break;
3746 }
3747 if (list_entry_is_head(p, &tsk->publications, binding_sock)) {
3748 /* We never set seq or call nl_dump_check_consistent()
3749 * this means that setting prev_seq here will cause the
3750 * consistence check to fail in the netlink callback
3751 * handler. Resulting in the last NLMSG_DONE message
3752 * having the NLM_F_DUMP_INTR flag set.
3753 */
3754 cb->prev_seq = 1;
3755 *last_publ = 0;
3756 return -EPIPE;
3757 }
3758 } else {
3759 p = list_first_entry(&tsk->publications, struct publication,
3760 binding_sock);
3761 }
3762
3763 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3764 err = __tipc_nl_add_sk_publ(skb, cb, p);
3765 if (err) {
3766 *last_publ = p->key;
3767 return err;
3768 }
3769 }
3770 *last_publ = 0;
3771
3772 return 0;
3773}
3774
3775int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3776{
3777 int err;
3778 u32 tsk_portid = cb->args[0];
3779 u32 last_publ = cb->args[1];
3780 u32 done = cb->args[2];
3781 struct net *net = sock_net(skb->sk);
3782 struct tipc_sock *tsk;
3783
3784 if (!tsk_portid) {
3785 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
3786 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3787
3788 if (!attrs[TIPC_NLA_SOCK])
3789 return -EINVAL;
3790
3791 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3792 attrs[TIPC_NLA_SOCK],
3793 tipc_nl_sock_policy, NULL);
3794 if (err)
3795 return err;
3796
3797 if (!sock[TIPC_NLA_SOCK_REF])
3798 return -EINVAL;
3799
3800 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3801 }
3802
3803 if (done)
3804 return 0;
3805
3806 tsk = tipc_sk_lookup(net, tsk_portid);
3807 if (!tsk)
3808 return -EINVAL;
3809
3810 lock_sock(&tsk->sk);
3811 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3812 if (!err)
3813 done = 1;
3814 release_sock(&tsk->sk);
3815 sock_put(&tsk->sk);
3816
3817 cb->args[0] = tsk_portid;
3818 cb->args[1] = last_publ;
3819 cb->args[2] = done;
3820
3821 return skb->len;
3822}
3823
3824/**
3825 * tipc_sk_filtering - check if a socket should be traced
3826 * @sk: the socket to be examined
3827 *
3828 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3829 * (portid, sock type, name type, name lower, name upper)
3830 *
3831 * Return: true if the socket meets the socket tuple data
3832 * (value 0 = 'any') or when there is no tuple set (all = 0),
3833 * otherwise false
3834 */
3835bool tipc_sk_filtering(struct sock *sk)
3836{
3837 struct tipc_sock *tsk;
3838 struct publication *p;
3839 u32 _port, _sktype, _type, _lower, _upper;
3840 u32 type = 0, lower = 0, upper = 0;
3841
3842 if (!sk)
3843 return true;
3844
3845 tsk = tipc_sk(sk);
3846
3847 _port = sysctl_tipc_sk_filter[0];
3848 _sktype = sysctl_tipc_sk_filter[1];
3849 _type = sysctl_tipc_sk_filter[2];
3850 _lower = sysctl_tipc_sk_filter[3];
3851 _upper = sysctl_tipc_sk_filter[4];
3852
3853 if (!_port && !_sktype && !_type && !_lower && !_upper)
3854 return true;
3855
3856 if (_port)
3857 return (_port == tsk->portid);
3858
3859 if (_sktype && _sktype != sk->sk_type)
3860 return false;
3861
3862 if (tsk->published) {
3863 p = list_first_entry_or_null(&tsk->publications,
3864 struct publication, binding_sock);
3865 if (p) {
3866 type = p->sr.type;
3867 lower = p->sr.lower;
3868 upper = p->sr.upper;
3869 }
3870 }
3871
3872 if (!tipc_sk_type_connectionless(sk)) {
3873 type = msg_nametype(&tsk->phdr);
3874 lower = msg_nameinst(&tsk->phdr);
3875 upper = lower;
3876 }
3877
3878 if ((_type && _type != type) || (_lower && _lower != lower) ||
3879 (_upper && _upper != upper))
3880 return false;
3881
3882 return true;
3883}
3884
3885u32 tipc_sock_get_portid(struct sock *sk)
3886{
3887 return (sk) ? (tipc_sk(sk))->portid : 0;
3888}
3889
3890/**
3891 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3892 * both the rcv and backlog queues are considered
3893 * @sk: tipc sk to be checked
3894 * @skb: tipc msg to be checked
3895 *
3896 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3897 */
3898
3899bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3900{
3901 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3902 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3903 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3904
3905 return (qsize > lim * 90 / 100);
3906}
3907
3908/**
3909 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3910 * only the rcv queue is considered
3911 * @sk: tipc sk to be checked
3912 * @skb: tipc msg to be checked
3913 *
3914 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3915 */
3916
3917bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3918{
3919 unsigned int lim = rcvbuf_limit(sk, skb);
3920 unsigned int qsize = sk_rmem_alloc_get(sk);
3921
3922 return (qsize > lim * 90 / 100);
3923}
3924
3925/**
3926 * tipc_sk_dump - dump TIPC socket
3927 * @sk: tipc sk to be dumped
3928 * @dqueues: bitmask to decide if any socket queue to be dumped?
3929 * - TIPC_DUMP_NONE: don't dump socket queues
3930 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3931 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3932 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3933 * - TIPC_DUMP_ALL: dump all the socket queues above
3934 * @buf: returned buffer of dump data in format
3935 */
3936int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3937{
3938 int i = 0;
3939 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3940 u32 conn_type, conn_instance;
3941 struct tipc_sock *tsk;
3942 struct publication *p;
3943 bool tsk_connected;
3944
3945 if (!sk) {
3946 i += scnprintf(buf, sz, "sk data: (null)\n");
3947 return i;
3948 }
3949
3950 tsk = tipc_sk(sk);
3951 tsk_connected = !tipc_sk_type_connectionless(sk);
3952
3953 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3954 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3955 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3956 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3957 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3958 if (tsk_connected) {
3959 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3960 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3961 conn_type = msg_nametype(&tsk->phdr);
3962 conn_instance = msg_nameinst(&tsk->phdr);
3963 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3964 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3965 }
3966 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3967 if (tsk->published) {
3968 p = list_first_entry_or_null(&tsk->publications,
3969 struct publication, binding_sock);
3970 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3971 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3972 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3973 }
3974 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3975 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3976 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3977 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3978 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3979 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3980 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3981 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3982 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3983 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3984 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3985 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3986 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3987 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3988
3989 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3990 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3991 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3992 }
3993
3994 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3995 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3996 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
3997 }
3998
3999 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
4000 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
4001 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
4002 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
4003 i += scnprintf(buf + i, sz - i, " tail ");
4004 i += tipc_skb_dump(sk->sk_backlog.tail, false,
4005 buf + i);
4006 }
4007 }
4008
4009 return i;
4010}