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