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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 <trace/events/sock.h>
41
42#include "core.h"
43#include "name_table.h"
44#include "node.h"
45#include "link.h"
46#include "name_distr.h"
47#include "socket.h"
48#include "bcast.h"
49#include "netlink.h"
50#include "group.h"
51#include "trace.h"
52
53#define NAGLE_START_INIT 4
54#define NAGLE_START_MAX 1024
55#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
56#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
57#define TIPC_MAX_PORT 0xffffffff
58#define TIPC_MIN_PORT 1
59#define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */
60
61enum {
62 TIPC_LISTEN = TCP_LISTEN,
63 TIPC_ESTABLISHED = TCP_ESTABLISHED,
64 TIPC_OPEN = TCP_CLOSE,
65 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
66 TIPC_CONNECTING = TCP_SYN_SENT,
67};
68
69struct sockaddr_pair {
70 struct sockaddr_tipc sock;
71 struct sockaddr_tipc member;
72};
73
74/**
75 * struct tipc_sock - TIPC socket structure
76 * @sk: socket - interacts with 'port' and with user via the socket API
77 * @max_pkt: maximum packet size "hint" used when building messages sent by port
78 * @maxnagle: maximum size of msg which can be subject to nagle
79 * @portid: unique port identity in TIPC socket hash table
80 * @phdr: preformatted message header used when sending messages
81 * @cong_links: list of congested links
82 * @publications: list of publications for port
83 * @pub_count: total # of publications port has made during its lifetime
84 * @conn_timeout: the time we can wait for an unresponded setup request
85 * @probe_unacked: probe has not received ack yet
86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
87 * @cong_link_cnt: number of congested links
88 * @snt_unacked: # messages sent by socket, and not yet acked by peer
89 * @snd_win: send window size
90 * @peer_caps: peer capabilities mask
91 * @rcv_unacked: # messages read by user, but not yet acked back to peer
92 * @rcv_win: receive window size
93 * @peer: 'connected' peer for dgram/rdm
94 * @node: hash table node
95 * @mc_method: cookie for use between socket and broadcast layer
96 * @rcu: rcu struct for tipc_sock
97 * @group: TIPC communications group
98 * @oneway: message count in one direction (FIXME)
99 * @nagle_start: current nagle value
100 * @snd_backlog: send backlog count
101 * @msg_acc: messages accepted; used in managing backlog and nagle
102 * @pkt_cnt: TIPC socket packet count
103 * @expect_ack: whether this TIPC socket is expecting an ack
104 * @nodelay: setsockopt() TIPC_NODELAY setting
105 * @group_is_open: TIPC socket group is fully open (FIXME)
106 * @published: true if port has one or more associated names
107 * @conn_addrtype: address type used when establishing connection
108 */
109struct tipc_sock {
110 struct sock sk;
111 u32 max_pkt;
112 u32 maxnagle;
113 u32 portid;
114 struct tipc_msg phdr;
115 struct list_head cong_links;
116 struct list_head publications;
117 u32 pub_count;
118 atomic_t dupl_rcvcnt;
119 u16 conn_timeout;
120 bool probe_unacked;
121 u16 cong_link_cnt;
122 u16 snt_unacked;
123 u16 snd_win;
124 u16 peer_caps;
125 u16 rcv_unacked;
126 u16 rcv_win;
127 struct sockaddr_tipc peer;
128 struct rhash_head node;
129 struct tipc_mc_method mc_method;
130 struct rcu_head rcu;
131 struct tipc_group *group;
132 u32 oneway;
133 u32 nagle_start;
134 u16 snd_backlog;
135 u16 msg_acc;
136 u16 pkt_cnt;
137 bool expect_ack;
138 bool nodelay;
139 bool group_is_open;
140 bool published;
141 u8 conn_addrtype;
142};
143
144static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
145static void tipc_data_ready(struct sock *sk);
146static void tipc_write_space(struct sock *sk);
147static void tipc_sock_destruct(struct sock *sk);
148static int tipc_release(struct socket *sock);
149static void tipc_sk_timeout(struct timer_list *t);
150static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
151static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
152static int tipc_sk_leave(struct tipc_sock *tsk);
153static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
154static int tipc_sk_insert(struct tipc_sock *tsk);
155static void tipc_sk_remove(struct tipc_sock *tsk);
156static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
157static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
158static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
159static int tipc_wait_for_connect(struct socket *sock, long *timeo_p);
160
161static const struct proto_ops packet_ops;
162static const struct proto_ops stream_ops;
163static const struct proto_ops msg_ops;
164static struct proto tipc_proto;
165static const struct rhashtable_params tsk_rht_params;
166
167static u32 tsk_own_node(struct tipc_sock *tsk)
168{
169 return msg_prevnode(&tsk->phdr);
170}
171
172static u32 tsk_peer_node(struct tipc_sock *tsk)
173{
174 return msg_destnode(&tsk->phdr);
175}
176
177static u32 tsk_peer_port(struct tipc_sock *tsk)
178{
179 return msg_destport(&tsk->phdr);
180}
181
182static bool tsk_unreliable(struct tipc_sock *tsk)
183{
184 return msg_src_droppable(&tsk->phdr) != 0;
185}
186
187static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
188{
189 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
190}
191
192static bool tsk_unreturnable(struct tipc_sock *tsk)
193{
194 return msg_dest_droppable(&tsk->phdr) != 0;
195}
196
197static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
198{
199 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
200}
201
202static int tsk_importance(struct tipc_sock *tsk)
203{
204 return msg_importance(&tsk->phdr);
205}
206
207static struct tipc_sock *tipc_sk(const struct sock *sk)
208{
209 return container_of(sk, struct tipc_sock, sk);
210}
211
212int tsk_set_importance(struct sock *sk, int imp)
213{
214 if (imp > TIPC_CRITICAL_IMPORTANCE)
215 return -EINVAL;
216 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
217 return 0;
218}
219
220static bool tsk_conn_cong(struct tipc_sock *tsk)
221{
222 return tsk->snt_unacked > tsk->snd_win;
223}
224
225static u16 tsk_blocks(int len)
226{
227 return ((len / FLOWCTL_BLK_SZ) + 1);
228}
229
230/* tsk_blocks(): translate a buffer size in bytes to number of
231 * advertisable blocks, taking into account the ratio truesize(len)/len
232 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
233 */
234static u16 tsk_adv_blocks(int len)
235{
236 return len / FLOWCTL_BLK_SZ / 4;
237}
238
239/* tsk_inc(): increment counter for sent or received data
240 * - If block based flow control is not supported by peer we
241 * fall back to message based ditto, incrementing the counter
242 */
243static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
244{
245 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
246 return ((msglen / FLOWCTL_BLK_SZ) + 1);
247 return 1;
248}
249
250/* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
251 */
252static void tsk_set_nagle(struct tipc_sock *tsk)
253{
254 struct sock *sk = &tsk->sk;
255
256 tsk->maxnagle = 0;
257 if (sk->sk_type != SOCK_STREAM)
258 return;
259 if (tsk->nodelay)
260 return;
261 if (!(tsk->peer_caps & TIPC_NAGLE))
262 return;
263 /* Limit node local buffer size to avoid receive queue overflow */
264 if (tsk->max_pkt == MAX_MSG_SIZE)
265 tsk->maxnagle = 1500;
266 else
267 tsk->maxnagle = tsk->max_pkt;
268}
269
270/**
271 * tsk_advance_rx_queue - discard first buffer in socket receive queue
272 * @sk: network socket
273 *
274 * Caller must hold socket lock
275 */
276static void tsk_advance_rx_queue(struct sock *sk)
277{
278 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
279 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
280}
281
282/* tipc_sk_respond() : send response message back to sender
283 */
284static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
285{
286 u32 selector;
287 u32 dnode;
288 u32 onode = tipc_own_addr(sock_net(sk));
289
290 if (!tipc_msg_reverse(onode, &skb, err))
291 return;
292
293 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
294 dnode = msg_destnode(buf_msg(skb));
295 selector = msg_origport(buf_msg(skb));
296 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
297}
298
299/**
300 * tsk_rej_rx_queue - reject all buffers in socket receive queue
301 * @sk: network socket
302 * @error: response error code
303 *
304 * Caller must hold socket lock
305 */
306static void tsk_rej_rx_queue(struct sock *sk, int error)
307{
308 struct sk_buff *skb;
309
310 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
311 tipc_sk_respond(sk, skb, error);
312}
313
314static bool tipc_sk_connected(const struct sock *sk)
315{
316 return READ_ONCE(sk->sk_state) == TIPC_ESTABLISHED;
317}
318
319/* tipc_sk_type_connectionless - check if the socket is datagram socket
320 * @sk: socket
321 *
322 * Returns true if connection less, false otherwise
323 */
324static bool tipc_sk_type_connectionless(struct sock *sk)
325{
326 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
327}
328
329/* tsk_peer_msg - verify if message was sent by connected port's peer
330 *
331 * Handles cases where the node's network address has changed from
332 * the default of <0.0.0> to its configured setting.
333 */
334static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
335{
336 struct sock *sk = &tsk->sk;
337 u32 self = tipc_own_addr(sock_net(sk));
338 u32 peer_port = tsk_peer_port(tsk);
339 u32 orig_node, peer_node;
340
341 if (unlikely(!tipc_sk_connected(sk)))
342 return false;
343
344 if (unlikely(msg_origport(msg) != peer_port))
345 return false;
346
347 orig_node = msg_orignode(msg);
348 peer_node = tsk_peer_node(tsk);
349
350 if (likely(orig_node == peer_node))
351 return true;
352
353 if (!orig_node && peer_node == self)
354 return true;
355
356 if (!peer_node && orig_node == self)
357 return true;
358
359 return false;
360}
361
362/* tipc_set_sk_state - set the sk_state of the socket
363 * @sk: socket
364 *
365 * Caller must hold socket lock
366 *
367 * Returns 0 on success, errno otherwise
368 */
369static int tipc_set_sk_state(struct sock *sk, int state)
370{
371 int oldsk_state = sk->sk_state;
372 int res = -EINVAL;
373
374 switch (state) {
375 case TIPC_OPEN:
376 res = 0;
377 break;
378 case TIPC_LISTEN:
379 case TIPC_CONNECTING:
380 if (oldsk_state == TIPC_OPEN)
381 res = 0;
382 break;
383 case TIPC_ESTABLISHED:
384 if (oldsk_state == TIPC_CONNECTING ||
385 oldsk_state == TIPC_OPEN)
386 res = 0;
387 break;
388 case TIPC_DISCONNECTING:
389 if (oldsk_state == TIPC_CONNECTING ||
390 oldsk_state == TIPC_ESTABLISHED)
391 res = 0;
392 break;
393 }
394
395 if (!res)
396 sk->sk_state = state;
397
398 return res;
399}
400
401static int tipc_sk_sock_err(struct socket *sock, long *timeout)
402{
403 struct sock *sk = sock->sk;
404 int err = sock_error(sk);
405 int typ = sock->type;
406
407 if (err)
408 return err;
409 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
410 if (sk->sk_state == TIPC_DISCONNECTING)
411 return -EPIPE;
412 else if (!tipc_sk_connected(sk))
413 return -ENOTCONN;
414 }
415 if (!*timeout)
416 return -EAGAIN;
417 if (signal_pending(current))
418 return sock_intr_errno(*timeout);
419
420 return 0;
421}
422
423#define tipc_wait_for_cond(sock_, timeo_, condition_) \
424({ \
425 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
426 struct sock *sk_; \
427 int rc_; \
428 \
429 while ((rc_ = !(condition_))) { \
430 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
431 smp_rmb(); \
432 sk_ = (sock_)->sk; \
433 rc_ = tipc_sk_sock_err((sock_), timeo_); \
434 if (rc_) \
435 break; \
436 add_wait_queue(sk_sleep(sk_), &wait_); \
437 release_sock(sk_); \
438 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
439 sched_annotate_sleep(); \
440 lock_sock(sk_); \
441 remove_wait_queue(sk_sleep(sk_), &wait_); \
442 } \
443 rc_; \
444})
445
446/**
447 * tipc_sk_create - create a TIPC socket
448 * @net: network namespace (must be default network)
449 * @sock: pre-allocated socket structure
450 * @protocol: protocol indicator (must be 0)
451 * @kern: caused by kernel or by userspace?
452 *
453 * This routine creates additional data structures used by the TIPC socket,
454 * initializes them, and links them together.
455 *
456 * Return: 0 on success, errno otherwise
457 */
458static int tipc_sk_create(struct net *net, struct socket *sock,
459 int protocol, int kern)
460{
461 const struct proto_ops *ops;
462 struct sock *sk;
463 struct tipc_sock *tsk;
464 struct tipc_msg *msg;
465
466 /* Validate arguments */
467 if (unlikely(protocol != 0))
468 return -EPROTONOSUPPORT;
469
470 switch (sock->type) {
471 case SOCK_STREAM:
472 ops = &stream_ops;
473 break;
474 case SOCK_SEQPACKET:
475 ops = &packet_ops;
476 break;
477 case SOCK_DGRAM:
478 case SOCK_RDM:
479 ops = &msg_ops;
480 break;
481 default:
482 return -EPROTOTYPE;
483 }
484
485 /* Allocate socket's protocol area */
486 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
487 if (sk == NULL)
488 return -ENOMEM;
489
490 tsk = tipc_sk(sk);
491 tsk->max_pkt = MAX_PKT_DEFAULT;
492 tsk->maxnagle = 0;
493 tsk->nagle_start = NAGLE_START_INIT;
494 INIT_LIST_HEAD(&tsk->publications);
495 INIT_LIST_HEAD(&tsk->cong_links);
496 msg = &tsk->phdr;
497
498 /* Finish initializing socket data structures */
499 sock->ops = ops;
500 sock_init_data(sock, sk);
501 tipc_set_sk_state(sk, TIPC_OPEN);
502 if (tipc_sk_insert(tsk)) {
503 sk_free(sk);
504 pr_warn("Socket create failed; port number exhausted\n");
505 return -EINVAL;
506 }
507
508 /* Ensure tsk is visible before we read own_addr. */
509 smp_mb();
510
511 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
512 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
513
514 msg_set_origport(msg, tsk->portid);
515 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
516 sk->sk_shutdown = 0;
517 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
518 sk->sk_rcvbuf = READ_ONCE(sysctl_tipc_rmem[1]);
519 sk->sk_data_ready = tipc_data_ready;
520 sk->sk_write_space = tipc_write_space;
521 sk->sk_destruct = tipc_sock_destruct;
522 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
523 tsk->group_is_open = true;
524 atomic_set(&tsk->dupl_rcvcnt, 0);
525
526 /* Start out with safe limits until we receive an advertised window */
527 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
528 tsk->rcv_win = tsk->snd_win;
529
530 if (tipc_sk_type_connectionless(sk)) {
531 tsk_set_unreturnable(tsk, true);
532 if (sock->type == SOCK_DGRAM)
533 tsk_set_unreliable(tsk, true);
534 }
535 __skb_queue_head_init(&tsk->mc_method.deferredq);
536 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
537 return 0;
538}
539
540static void tipc_sk_callback(struct rcu_head *head)
541{
542 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
543
544 sock_put(&tsk->sk);
545}
546
547/* Caller should hold socket lock for the socket. */
548static void __tipc_shutdown(struct socket *sock, int error)
549{
550 struct sock *sk = sock->sk;
551 struct tipc_sock *tsk = tipc_sk(sk);
552 struct net *net = sock_net(sk);
553 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
554 u32 dnode = tsk_peer_node(tsk);
555 struct sk_buff *skb;
556
557 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
558 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
559 !tsk_conn_cong(tsk)));
560
561 /* Push out delayed messages if in Nagle mode */
562 tipc_sk_push_backlog(tsk, false);
563 /* Remove pending SYN */
564 __skb_queue_purge(&sk->sk_write_queue);
565
566 /* Remove partially received buffer if any */
567 skb = skb_peek(&sk->sk_receive_queue);
568 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
569 __skb_unlink(skb, &sk->sk_receive_queue);
570 kfree_skb(skb);
571 }
572
573 /* Reject all unreceived messages if connectionless */
574 if (tipc_sk_type_connectionless(sk)) {
575 tsk_rej_rx_queue(sk, error);
576 return;
577 }
578
579 switch (sk->sk_state) {
580 case TIPC_CONNECTING:
581 case TIPC_ESTABLISHED:
582 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
583 tipc_node_remove_conn(net, dnode, tsk->portid);
584 /* Send a FIN+/- to its peer */
585 skb = __skb_dequeue(&sk->sk_receive_queue);
586 if (skb) {
587 __skb_queue_purge(&sk->sk_receive_queue);
588 tipc_sk_respond(sk, skb, error);
589 break;
590 }
591 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
592 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
593 tsk_own_node(tsk), tsk_peer_port(tsk),
594 tsk->portid, error);
595 if (skb)
596 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
597 break;
598 case TIPC_LISTEN:
599 /* Reject all SYN messages */
600 tsk_rej_rx_queue(sk, error);
601 break;
602 default:
603 __skb_queue_purge(&sk->sk_receive_queue);
604 break;
605 }
606}
607
608/**
609 * tipc_release - destroy a TIPC socket
610 * @sock: socket to destroy
611 *
612 * This routine cleans up any messages that are still queued on the socket.
613 * For DGRAM and RDM socket types, all queued messages are rejected.
614 * For SEQPACKET and STREAM socket types, the first message is rejected
615 * and any others are discarded. (If the first message on a STREAM socket
616 * is partially-read, it is discarded and the next one is rejected instead.)
617 *
618 * NOTE: Rejected messages are not necessarily returned to the sender! They
619 * are returned or discarded according to the "destination droppable" setting
620 * specified for the message by the sender.
621 *
622 * Return: 0 on success, errno otherwise
623 */
624static int tipc_release(struct socket *sock)
625{
626 struct sock *sk = sock->sk;
627 struct tipc_sock *tsk;
628
629 /*
630 * Exit if socket isn't fully initialized (occurs when a failed accept()
631 * releases a pre-allocated child socket that was never used)
632 */
633 if (sk == NULL)
634 return 0;
635
636 tsk = tipc_sk(sk);
637 lock_sock(sk);
638
639 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
640 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
641 sk->sk_shutdown = SHUTDOWN_MASK;
642 tipc_sk_leave(tsk);
643 tipc_sk_withdraw(tsk, NULL);
644 __skb_queue_purge(&tsk->mc_method.deferredq);
645 sk_stop_timer(sk, &sk->sk_timer);
646 tipc_sk_remove(tsk);
647
648 sock_orphan(sk);
649 /* Reject any messages that accumulated in backlog queue */
650 release_sock(sk);
651 tipc_dest_list_purge(&tsk->cong_links);
652 tsk->cong_link_cnt = 0;
653 call_rcu(&tsk->rcu, tipc_sk_callback);
654 sock->sk = NULL;
655
656 return 0;
657}
658
659/**
660 * __tipc_bind - associate or disassociate TIPC name(s) with a socket
661 * @sock: socket structure
662 * @skaddr: socket address describing name(s) and desired operation
663 * @alen: size of socket address data structure
664 *
665 * Name and name sequence binding are indicated using a positive scope value;
666 * a negative scope value unbinds the specified name. Specifying no name
667 * (i.e. a socket address length of 0) unbinds all names from the socket.
668 *
669 * Return: 0 on success, errno otherwise
670 *
671 * NOTE: This routine doesn't need to take the socket lock since it doesn't
672 * access any non-constant socket information.
673 */
674static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
675{
676 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
677 struct tipc_sock *tsk = tipc_sk(sock->sk);
678 bool unbind = false;
679
680 if (unlikely(!alen))
681 return tipc_sk_withdraw(tsk, NULL);
682
683 if (ua->addrtype == TIPC_SERVICE_ADDR) {
684 ua->addrtype = TIPC_SERVICE_RANGE;
685 ua->sr.upper = ua->sr.lower;
686 }
687 if (ua->scope < 0) {
688 unbind = true;
689 ua->scope = -ua->scope;
690 }
691 /* Users may still use deprecated TIPC_ZONE_SCOPE */
692 if (ua->scope != TIPC_NODE_SCOPE)
693 ua->scope = TIPC_CLUSTER_SCOPE;
694
695 if (tsk->group)
696 return -EACCES;
697
698 if (unbind)
699 return tipc_sk_withdraw(tsk, ua);
700 return tipc_sk_publish(tsk, ua);
701}
702
703int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
704{
705 int res;
706
707 lock_sock(sock->sk);
708 res = __tipc_bind(sock, skaddr, alen);
709 release_sock(sock->sk);
710 return res;
711}
712
713static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
714{
715 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
716 u32 atype = ua->addrtype;
717
718 if (alen) {
719 if (!tipc_uaddr_valid(ua, alen))
720 return -EINVAL;
721 if (atype == TIPC_SOCKET_ADDR)
722 return -EAFNOSUPPORT;
723 if (ua->sr.type < TIPC_RESERVED_TYPES) {
724 pr_warn_once("Can't bind to reserved service type %u\n",
725 ua->sr.type);
726 return -EACCES;
727 }
728 }
729 return tipc_sk_bind(sock, skaddr, alen);
730}
731
732/**
733 * tipc_getname - get port ID of socket or peer socket
734 * @sock: socket structure
735 * @uaddr: area for returned socket address
736 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
737 *
738 * Return: 0 on success, errno otherwise
739 *
740 * NOTE: This routine doesn't need to take the socket lock since it only
741 * accesses socket information that is unchanging (or which changes in
742 * a completely predictable manner).
743 */
744static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
745 int peer)
746{
747 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
748 struct sock *sk = sock->sk;
749 struct tipc_sock *tsk = tipc_sk(sk);
750
751 memset(addr, 0, sizeof(*addr));
752 if (peer) {
753 if ((!tipc_sk_connected(sk)) &&
754 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
755 return -ENOTCONN;
756 addr->addr.id.ref = tsk_peer_port(tsk);
757 addr->addr.id.node = tsk_peer_node(tsk);
758 } else {
759 addr->addr.id.ref = tsk->portid;
760 addr->addr.id.node = tipc_own_addr(sock_net(sk));
761 }
762
763 addr->addrtype = TIPC_SOCKET_ADDR;
764 addr->family = AF_TIPC;
765 addr->scope = 0;
766 addr->addr.name.domain = 0;
767
768 return sizeof(*addr);
769}
770
771/**
772 * tipc_poll - read and possibly block on pollmask
773 * @file: file structure associated with the socket
774 * @sock: socket for which to calculate the poll bits
775 * @wait: ???
776 *
777 * Return: pollmask value
778 *
779 * COMMENTARY:
780 * It appears that the usual socket locking mechanisms are not useful here
781 * since the pollmask info is potentially out-of-date the moment this routine
782 * exits. TCP and other protocols seem to rely on higher level poll routines
783 * to handle any preventable race conditions, so TIPC will do the same ...
784 *
785 * IMPORTANT: The fact that a read or write operation is indicated does NOT
786 * imply that the operation will succeed, merely that it should be performed
787 * and will not block.
788 */
789static __poll_t tipc_poll(struct file *file, struct socket *sock,
790 poll_table *wait)
791{
792 struct sock *sk = sock->sk;
793 struct tipc_sock *tsk = tipc_sk(sk);
794 __poll_t revents = 0;
795
796 sock_poll_wait(file, sock, wait);
797 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
798
799 if (sk->sk_shutdown & RCV_SHUTDOWN)
800 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
801 if (sk->sk_shutdown == SHUTDOWN_MASK)
802 revents |= EPOLLHUP;
803
804 switch (sk->sk_state) {
805 case TIPC_ESTABLISHED:
806 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
807 revents |= EPOLLOUT;
808 fallthrough;
809 case TIPC_LISTEN:
810 case TIPC_CONNECTING:
811 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
812 revents |= EPOLLIN | EPOLLRDNORM;
813 break;
814 case TIPC_OPEN:
815 if (tsk->group_is_open && !tsk->cong_link_cnt)
816 revents |= EPOLLOUT;
817 if (!tipc_sk_type_connectionless(sk))
818 break;
819 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
820 break;
821 revents |= EPOLLIN | EPOLLRDNORM;
822 break;
823 case TIPC_DISCONNECTING:
824 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
825 break;
826 }
827 return revents;
828}
829
830/**
831 * tipc_sendmcast - send multicast message
832 * @sock: socket structure
833 * @ua: destination address struct
834 * @msg: message to send
835 * @dlen: length of data to send
836 * @timeout: timeout to wait for wakeup
837 *
838 * Called from function tipc_sendmsg(), which has done all sanity checks
839 * Return: the number of bytes sent on success, or errno
840 */
841static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua,
842 struct msghdr *msg, size_t dlen, long timeout)
843{
844 struct sock *sk = sock->sk;
845 struct tipc_sock *tsk = tipc_sk(sk);
846 struct tipc_msg *hdr = &tsk->phdr;
847 struct net *net = sock_net(sk);
848 int mtu = tipc_bcast_get_mtu(net);
849 struct sk_buff_head pkts;
850 struct tipc_nlist dsts;
851 int rc;
852
853 if (tsk->group)
854 return -EACCES;
855
856 /* Block or return if any destination link is congested */
857 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
858 if (unlikely(rc))
859 return rc;
860
861 /* Lookup destination nodes */
862 tipc_nlist_init(&dsts, tipc_own_addr(net));
863 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts);
864 if (!dsts.local && !dsts.remote)
865 return -EHOSTUNREACH;
866
867 /* Build message header */
868 msg_set_type(hdr, TIPC_MCAST_MSG);
869 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
870 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
871 msg_set_destport(hdr, 0);
872 msg_set_destnode(hdr, 0);
873 msg_set_nametype(hdr, ua->sr.type);
874 msg_set_namelower(hdr, ua->sr.lower);
875 msg_set_nameupper(hdr, ua->sr.upper);
876
877 /* Build message as chain of buffers */
878 __skb_queue_head_init(&pkts);
879 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
880
881 /* Send message if build was successful */
882 if (unlikely(rc == dlen)) {
883 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
884 TIPC_DUMP_SK_SNDQ, " ");
885 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts,
886 &tsk->cong_link_cnt);
887 }
888
889 tipc_nlist_purge(&dsts);
890
891 return rc ? rc : dlen;
892}
893
894/**
895 * tipc_send_group_msg - send a message to a member in the group
896 * @net: network namespace
897 * @tsk: tipc socket
898 * @m: message to send
899 * @mb: group member
900 * @dnode: destination node
901 * @dport: destination port
902 * @dlen: total length of message data
903 */
904static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
905 struct msghdr *m, struct tipc_member *mb,
906 u32 dnode, u32 dport, int dlen)
907{
908 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
909 struct tipc_mc_method *method = &tsk->mc_method;
910 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
911 struct tipc_msg *hdr = &tsk->phdr;
912 struct sk_buff_head pkts;
913 int mtu, rc;
914
915 /* Complete message header */
916 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
917 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
918 msg_set_destport(hdr, dport);
919 msg_set_destnode(hdr, dnode);
920 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
921
922 /* Build message as chain of buffers */
923 __skb_queue_head_init(&pkts);
924 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
925 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
926 if (unlikely(rc != dlen))
927 return rc;
928
929 /* Send message */
930 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
931 if (unlikely(rc == -ELINKCONG)) {
932 tipc_dest_push(&tsk->cong_links, dnode, 0);
933 tsk->cong_link_cnt++;
934 }
935
936 /* Update send window */
937 tipc_group_update_member(mb, blks);
938
939 /* A broadcast sent within next EXPIRE period must follow same path */
940 method->rcast = true;
941 method->mandatory = true;
942 return dlen;
943}
944
945/**
946 * tipc_send_group_unicast - send message to a member in the group
947 * @sock: socket structure
948 * @m: message to send
949 * @dlen: total length of message data
950 * @timeout: timeout to wait for wakeup
951 *
952 * Called from function tipc_sendmsg(), which has done all sanity checks
953 * Return: the number of bytes sent on success, or errno
954 */
955static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
956 int dlen, long timeout)
957{
958 struct sock *sk = sock->sk;
959 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
960 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
961 struct tipc_sock *tsk = tipc_sk(sk);
962 struct net *net = sock_net(sk);
963 struct tipc_member *mb = NULL;
964 u32 node, port;
965 int rc;
966
967 node = ua->sk.node;
968 port = ua->sk.ref;
969 if (!port && !node)
970 return -EHOSTUNREACH;
971
972 /* Block or return if destination link or member is congested */
973 rc = tipc_wait_for_cond(sock, &timeout,
974 !tipc_dest_find(&tsk->cong_links, node, 0) &&
975 tsk->group &&
976 !tipc_group_cong(tsk->group, node, port, blks,
977 &mb));
978 if (unlikely(rc))
979 return rc;
980
981 if (unlikely(!mb))
982 return -EHOSTUNREACH;
983
984 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
985
986 return rc ? rc : dlen;
987}
988
989/**
990 * tipc_send_group_anycast - send message to any member with given identity
991 * @sock: socket structure
992 * @m: message to send
993 * @dlen: total length of message data
994 * @timeout: timeout to wait for wakeup
995 *
996 * Called from function tipc_sendmsg(), which has done all sanity checks
997 * Return: the number of bytes sent on success, or errno
998 */
999static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
1000 int dlen, long timeout)
1001{
1002 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1003 struct sock *sk = sock->sk;
1004 struct tipc_sock *tsk = tipc_sk(sk);
1005 struct list_head *cong_links = &tsk->cong_links;
1006 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
1007 struct tipc_msg *hdr = &tsk->phdr;
1008 struct tipc_member *first = NULL;
1009 struct tipc_member *mbr = NULL;
1010 struct net *net = sock_net(sk);
1011 u32 node, port, exclude;
1012 LIST_HEAD(dsts);
1013 int lookups = 0;
1014 int dstcnt, rc;
1015 bool cong;
1016
1017 ua->sa.type = msg_nametype(hdr);
1018 ua->scope = msg_lookup_scope(hdr);
1019
1020 while (++lookups < 4) {
1021 exclude = tipc_group_exclude(tsk->group);
1022
1023 first = NULL;
1024
1025 /* Look for a non-congested destination member, if any */
1026 while (1) {
1027 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1028 exclude, false))
1029 return -EHOSTUNREACH;
1030 tipc_dest_pop(&dsts, &node, &port);
1031 cong = tipc_group_cong(tsk->group, node, port, blks,
1032 &mbr);
1033 if (!cong)
1034 break;
1035 if (mbr == first)
1036 break;
1037 if (!first)
1038 first = mbr;
1039 }
1040
1041 /* Start over if destination was not in member list */
1042 if (unlikely(!mbr))
1043 continue;
1044
1045 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1046 break;
1047
1048 /* Block or return if destination link or member is congested */
1049 rc = tipc_wait_for_cond(sock, &timeout,
1050 !tipc_dest_find(cong_links, node, 0) &&
1051 tsk->group &&
1052 !tipc_group_cong(tsk->group, node, port,
1053 blks, &mbr));
1054 if (unlikely(rc))
1055 return rc;
1056
1057 /* Send, unless destination disappeared while waiting */
1058 if (likely(mbr))
1059 break;
1060 }
1061
1062 if (unlikely(lookups >= 4))
1063 return -EHOSTUNREACH;
1064
1065 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1066
1067 return rc ? rc : dlen;
1068}
1069
1070/**
1071 * tipc_send_group_bcast - send message to all members in communication group
1072 * @sock: socket structure
1073 * @m: message to send
1074 * @dlen: total length of message data
1075 * @timeout: timeout to wait for wakeup
1076 *
1077 * Called from function tipc_sendmsg(), which has done all sanity checks
1078 * Return: the number of bytes sent on success, or errno
1079 */
1080static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1081 int dlen, long timeout)
1082{
1083 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1084 struct sock *sk = sock->sk;
1085 struct net *net = sock_net(sk);
1086 struct tipc_sock *tsk = tipc_sk(sk);
1087 struct tipc_nlist *dsts;
1088 struct tipc_mc_method *method = &tsk->mc_method;
1089 bool ack = method->mandatory && method->rcast;
1090 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1091 struct tipc_msg *hdr = &tsk->phdr;
1092 int mtu = tipc_bcast_get_mtu(net);
1093 struct sk_buff_head pkts;
1094 int rc = -EHOSTUNREACH;
1095
1096 /* Block or return if any destination link or member is congested */
1097 rc = tipc_wait_for_cond(sock, &timeout,
1098 !tsk->cong_link_cnt && tsk->group &&
1099 !tipc_group_bc_cong(tsk->group, blks));
1100 if (unlikely(rc))
1101 return rc;
1102
1103 dsts = tipc_group_dests(tsk->group);
1104 if (!dsts->local && !dsts->remote)
1105 return -EHOSTUNREACH;
1106
1107 /* Complete message header */
1108 if (ua) {
1109 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1110 msg_set_nameinst(hdr, ua->sa.instance);
1111 } else {
1112 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1113 msg_set_nameinst(hdr, 0);
1114 }
1115 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1116 msg_set_destport(hdr, 0);
1117 msg_set_destnode(hdr, 0);
1118 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1119
1120 /* Avoid getting stuck with repeated forced replicasts */
1121 msg_set_grp_bc_ack_req(hdr, ack);
1122
1123 /* Build message as chain of buffers */
1124 __skb_queue_head_init(&pkts);
1125 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1126 if (unlikely(rc != dlen))
1127 return rc;
1128
1129 /* Send message */
1130 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1131 if (unlikely(rc))
1132 return rc;
1133
1134 /* Update broadcast sequence number and send windows */
1135 tipc_group_update_bc_members(tsk->group, blks, ack);
1136
1137 /* Broadcast link is now free to choose method for next broadcast */
1138 method->mandatory = false;
1139 method->expires = jiffies;
1140
1141 return dlen;
1142}
1143
1144/**
1145 * tipc_send_group_mcast - send message to all members with given identity
1146 * @sock: socket structure
1147 * @m: message to send
1148 * @dlen: total length of message data
1149 * @timeout: timeout to wait for wakeup
1150 *
1151 * Called from function tipc_sendmsg(), which has done all sanity checks
1152 * Return: the number of bytes sent on success, or errno
1153 */
1154static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1155 int dlen, long timeout)
1156{
1157 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1158 struct sock *sk = sock->sk;
1159 struct tipc_sock *tsk = tipc_sk(sk);
1160 struct tipc_group *grp = tsk->group;
1161 struct tipc_msg *hdr = &tsk->phdr;
1162 struct net *net = sock_net(sk);
1163 u32 dstcnt, exclude;
1164 LIST_HEAD(dsts);
1165
1166 ua->sa.type = msg_nametype(hdr);
1167 ua->scope = msg_lookup_scope(hdr);
1168 exclude = tipc_group_exclude(grp);
1169
1170 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1171 return -EHOSTUNREACH;
1172
1173 if (dstcnt == 1) {
1174 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1175 return tipc_send_group_unicast(sock, m, dlen, timeout);
1176 }
1177
1178 tipc_dest_list_purge(&dsts);
1179 return tipc_send_group_bcast(sock, m, dlen, timeout);
1180}
1181
1182/**
1183 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1184 * @net: the associated network namespace
1185 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1186 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1187 *
1188 * Multi-threaded: parallel calls with reference to same queues may occur
1189 */
1190void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1191 struct sk_buff_head *inputq)
1192{
1193 u32 self = tipc_own_addr(net);
1194 struct sk_buff *skb, *_skb;
1195 u32 portid, onode;
1196 struct sk_buff_head tmpq;
1197 struct list_head dports;
1198 struct tipc_msg *hdr;
1199 struct tipc_uaddr ua;
1200 int user, mtyp, hlen;
1201
1202 __skb_queue_head_init(&tmpq);
1203 INIT_LIST_HEAD(&dports);
1204 ua.addrtype = TIPC_SERVICE_RANGE;
1205
1206 /* tipc_skb_peek() increments the head skb's reference counter */
1207 skb = tipc_skb_peek(arrvq, &inputq->lock);
1208 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1209 hdr = buf_msg(skb);
1210 user = msg_user(hdr);
1211 mtyp = msg_type(hdr);
1212 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1213 onode = msg_orignode(hdr);
1214 ua.sr.type = msg_nametype(hdr);
1215 ua.sr.lower = msg_namelower(hdr);
1216 ua.sr.upper = msg_nameupper(hdr);
1217 if (onode == self)
1218 ua.scope = TIPC_ANY_SCOPE;
1219 else
1220 ua.scope = TIPC_CLUSTER_SCOPE;
1221
1222 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1223 spin_lock_bh(&inputq->lock);
1224 if (skb_peek(arrvq) == skb) {
1225 __skb_dequeue(arrvq);
1226 __skb_queue_tail(inputq, skb);
1227 }
1228 kfree_skb(skb);
1229 spin_unlock_bh(&inputq->lock);
1230 continue;
1231 }
1232
1233 /* Group messages require exact scope match */
1234 if (msg_in_group(hdr)) {
1235 ua.sr.lower = 0;
1236 ua.sr.upper = ~0;
1237 ua.scope = msg_lookup_scope(hdr);
1238 }
1239
1240 /* Create destination port list: */
1241 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1242
1243 /* Clone message per destination */
1244 while (tipc_dest_pop(&dports, NULL, &portid)) {
1245 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1246 if (_skb) {
1247 msg_set_destport(buf_msg(_skb), portid);
1248 __skb_queue_tail(&tmpq, _skb);
1249 continue;
1250 }
1251 pr_warn("Failed to clone mcast rcv buffer\n");
1252 }
1253 /* Append clones to inputq only if skb is still head of arrvq */
1254 spin_lock_bh(&inputq->lock);
1255 if (skb_peek(arrvq) == skb) {
1256 skb_queue_splice_tail_init(&tmpq, inputq);
1257 /* Decrement the skb's refcnt */
1258 kfree_skb(__skb_dequeue(arrvq));
1259 }
1260 spin_unlock_bh(&inputq->lock);
1261 __skb_queue_purge(&tmpq);
1262 kfree_skb(skb);
1263 }
1264 tipc_sk_rcv(net, inputq);
1265}
1266
1267/* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1268 * when socket is in Nagle mode
1269 */
1270static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1271{
1272 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1273 struct sk_buff *skb = skb_peek_tail(txq);
1274 struct net *net = sock_net(&tsk->sk);
1275 u32 dnode = tsk_peer_node(tsk);
1276 int rc;
1277
1278 if (nagle_ack) {
1279 tsk->pkt_cnt += skb_queue_len(txq);
1280 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1281 tsk->oneway = 0;
1282 if (tsk->nagle_start < NAGLE_START_MAX)
1283 tsk->nagle_start *= 2;
1284 tsk->expect_ack = false;
1285 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1286 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1287 tsk->nagle_start);
1288 } else {
1289 tsk->nagle_start = NAGLE_START_INIT;
1290 if (skb) {
1291 msg_set_ack_required(buf_msg(skb));
1292 tsk->expect_ack = true;
1293 } else {
1294 tsk->expect_ack = false;
1295 }
1296 }
1297 tsk->msg_acc = 0;
1298 tsk->pkt_cnt = 0;
1299 }
1300
1301 if (!skb || tsk->cong_link_cnt)
1302 return;
1303
1304 /* Do not send SYN again after congestion */
1305 if (msg_is_syn(buf_msg(skb)))
1306 return;
1307
1308 if (tsk->msg_acc)
1309 tsk->pkt_cnt += skb_queue_len(txq);
1310 tsk->snt_unacked += tsk->snd_backlog;
1311 tsk->snd_backlog = 0;
1312 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1313 if (rc == -ELINKCONG)
1314 tsk->cong_link_cnt = 1;
1315}
1316
1317/**
1318 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1319 * @tsk: receiving socket
1320 * @skb: pointer to message buffer.
1321 * @inputq: buffer list containing the buffers
1322 * @xmitq: output message area
1323 */
1324static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1325 struct sk_buff_head *inputq,
1326 struct sk_buff_head *xmitq)
1327{
1328 struct tipc_msg *hdr = buf_msg(skb);
1329 u32 onode = tsk_own_node(tsk);
1330 struct sock *sk = &tsk->sk;
1331 int mtyp = msg_type(hdr);
1332 bool was_cong;
1333
1334 /* Ignore if connection cannot be validated: */
1335 if (!tsk_peer_msg(tsk, hdr)) {
1336 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1337 goto exit;
1338 }
1339
1340 if (unlikely(msg_errcode(hdr))) {
1341 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1342 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1343 tsk_peer_port(tsk));
1344 sk->sk_state_change(sk);
1345
1346 /* State change is ignored if socket already awake,
1347 * - convert msg to abort msg and add to inqueue
1348 */
1349 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1350 msg_set_type(hdr, TIPC_CONN_MSG);
1351 msg_set_size(hdr, BASIC_H_SIZE);
1352 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1353 __skb_queue_tail(inputq, skb);
1354 return;
1355 }
1356
1357 tsk->probe_unacked = false;
1358
1359 if (mtyp == CONN_PROBE) {
1360 msg_set_type(hdr, CONN_PROBE_REPLY);
1361 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1362 __skb_queue_tail(xmitq, skb);
1363 return;
1364 } else if (mtyp == CONN_ACK) {
1365 was_cong = tsk_conn_cong(tsk);
1366 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1367 tsk->snt_unacked -= msg_conn_ack(hdr);
1368 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1369 tsk->snd_win = msg_adv_win(hdr);
1370 if (was_cong && !tsk_conn_cong(tsk))
1371 sk->sk_write_space(sk);
1372 } else if (mtyp != CONN_PROBE_REPLY) {
1373 pr_warn("Received unknown CONN_PROTO msg\n");
1374 }
1375exit:
1376 kfree_skb(skb);
1377}
1378
1379/**
1380 * tipc_sendmsg - send message in connectionless manner
1381 * @sock: socket structure
1382 * @m: message to send
1383 * @dsz: amount of user data to be sent
1384 *
1385 * Message must have an destination specified explicitly.
1386 * Used for SOCK_RDM and SOCK_DGRAM messages,
1387 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1388 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1389 *
1390 * Return: the number of bytes sent on success, or errno otherwise
1391 */
1392static int tipc_sendmsg(struct socket *sock,
1393 struct msghdr *m, size_t dsz)
1394{
1395 struct sock *sk = sock->sk;
1396 int ret;
1397
1398 lock_sock(sk);
1399 ret = __tipc_sendmsg(sock, m, dsz);
1400 release_sock(sk);
1401
1402 return ret;
1403}
1404
1405static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1406{
1407 struct sock *sk = sock->sk;
1408 struct net *net = sock_net(sk);
1409 struct tipc_sock *tsk = tipc_sk(sk);
1410 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1411 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1412 struct list_head *clinks = &tsk->cong_links;
1413 bool syn = !tipc_sk_type_connectionless(sk);
1414 struct tipc_group *grp = tsk->group;
1415 struct tipc_msg *hdr = &tsk->phdr;
1416 struct tipc_socket_addr skaddr;
1417 struct sk_buff_head pkts;
1418 int atype, mtu, rc;
1419
1420 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1421 return -EMSGSIZE;
1422
1423 if (ua) {
1424 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1425 return -EINVAL;
1426 atype = ua->addrtype;
1427 }
1428
1429 /* If socket belongs to a communication group follow other paths */
1430 if (grp) {
1431 if (!ua)
1432 return tipc_send_group_bcast(sock, m, dlen, timeout);
1433 if (atype == TIPC_SERVICE_ADDR)
1434 return tipc_send_group_anycast(sock, m, dlen, timeout);
1435 if (atype == TIPC_SOCKET_ADDR)
1436 return tipc_send_group_unicast(sock, m, dlen, timeout);
1437 if (atype == TIPC_SERVICE_RANGE)
1438 return tipc_send_group_mcast(sock, m, dlen, timeout);
1439 return -EINVAL;
1440 }
1441
1442 if (!ua) {
1443 ua = (struct tipc_uaddr *)&tsk->peer;
1444 if (!syn && ua->family != AF_TIPC)
1445 return -EDESTADDRREQ;
1446 atype = ua->addrtype;
1447 }
1448
1449 if (unlikely(syn)) {
1450 if (sk->sk_state == TIPC_LISTEN)
1451 return -EPIPE;
1452 if (sk->sk_state != TIPC_OPEN)
1453 return -EISCONN;
1454 if (tsk->published)
1455 return -EOPNOTSUPP;
1456 if (atype == TIPC_SERVICE_ADDR)
1457 tsk->conn_addrtype = atype;
1458 msg_set_syn(hdr, 1);
1459 }
1460
1461 memset(&skaddr, 0, sizeof(skaddr));
1462
1463 /* Determine destination */
1464 if (atype == TIPC_SERVICE_RANGE) {
1465 return tipc_sendmcast(sock, ua, m, dlen, timeout);
1466 } else if (atype == TIPC_SERVICE_ADDR) {
1467 skaddr.node = ua->lookup_node;
1468 ua->scope = tipc_node2scope(skaddr.node);
1469 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr))
1470 return -EHOSTUNREACH;
1471 } else if (atype == TIPC_SOCKET_ADDR) {
1472 skaddr = ua->sk;
1473 } else {
1474 return -EINVAL;
1475 }
1476
1477 /* Block or return if destination link is congested */
1478 rc = tipc_wait_for_cond(sock, &timeout,
1479 !tipc_dest_find(clinks, skaddr.node, 0));
1480 if (unlikely(rc))
1481 return rc;
1482
1483 /* Finally build message header */
1484 msg_set_destnode(hdr, skaddr.node);
1485 msg_set_destport(hdr, skaddr.ref);
1486 if (atype == TIPC_SERVICE_ADDR) {
1487 msg_set_type(hdr, TIPC_NAMED_MSG);
1488 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1489 msg_set_nametype(hdr, ua->sa.type);
1490 msg_set_nameinst(hdr, ua->sa.instance);
1491 msg_set_lookup_scope(hdr, ua->scope);
1492 } else { /* TIPC_SOCKET_ADDR */
1493 msg_set_type(hdr, TIPC_DIRECT_MSG);
1494 msg_set_lookup_scope(hdr, 0);
1495 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1496 }
1497
1498 /* Add message body */
1499 __skb_queue_head_init(&pkts);
1500 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
1501 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1502 if (unlikely(rc != dlen))
1503 return rc;
1504 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1505 __skb_queue_purge(&pkts);
1506 return -ENOMEM;
1507 }
1508
1509 /* Send message */
1510 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1511 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid);
1512 if (unlikely(rc == -ELINKCONG)) {
1513 tipc_dest_push(clinks, skaddr.node, 0);
1514 tsk->cong_link_cnt++;
1515 rc = 0;
1516 }
1517
1518 if (unlikely(syn && !rc)) {
1519 tipc_set_sk_state(sk, TIPC_CONNECTING);
1520 if (dlen && timeout) {
1521 timeout = msecs_to_jiffies(timeout);
1522 tipc_wait_for_connect(sock, &timeout);
1523 }
1524 }
1525
1526 return rc ? rc : dlen;
1527}
1528
1529/**
1530 * tipc_sendstream - send stream-oriented data
1531 * @sock: socket structure
1532 * @m: data to send
1533 * @dsz: total length of data to be transmitted
1534 *
1535 * Used for SOCK_STREAM data.
1536 *
1537 * Return: the number of bytes sent on success (or partial success),
1538 * or errno if no data sent
1539 */
1540static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1541{
1542 struct sock *sk = sock->sk;
1543 int ret;
1544
1545 lock_sock(sk);
1546 ret = __tipc_sendstream(sock, m, dsz);
1547 release_sock(sk);
1548
1549 return ret;
1550}
1551
1552static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1553{
1554 struct sock *sk = sock->sk;
1555 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1556 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1557 struct sk_buff_head *txq = &sk->sk_write_queue;
1558 struct tipc_sock *tsk = tipc_sk(sk);
1559 struct tipc_msg *hdr = &tsk->phdr;
1560 struct net *net = sock_net(sk);
1561 struct sk_buff *skb;
1562 u32 dnode = tsk_peer_node(tsk);
1563 int maxnagle = tsk->maxnagle;
1564 int maxpkt = tsk->max_pkt;
1565 int send, sent = 0;
1566 int blocks, rc = 0;
1567
1568 if (unlikely(dlen > INT_MAX))
1569 return -EMSGSIZE;
1570
1571 /* Handle implicit connection setup */
1572 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) {
1573 rc = __tipc_sendmsg(sock, m, dlen);
1574 if (dlen && dlen == rc) {
1575 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1576 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1577 }
1578 return rc;
1579 }
1580
1581 do {
1582 rc = tipc_wait_for_cond(sock, &timeout,
1583 (!tsk->cong_link_cnt &&
1584 !tsk_conn_cong(tsk) &&
1585 tipc_sk_connected(sk)));
1586 if (unlikely(rc))
1587 break;
1588 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1589 blocks = tsk->snd_backlog;
1590 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1591 send <= maxnagle) {
1592 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1593 if (unlikely(rc < 0))
1594 break;
1595 blocks += rc;
1596 tsk->msg_acc++;
1597 if (blocks <= 64 && tsk->expect_ack) {
1598 tsk->snd_backlog = blocks;
1599 sent += send;
1600 break;
1601 } else if (blocks > 64) {
1602 tsk->pkt_cnt += skb_queue_len(txq);
1603 } else {
1604 skb = skb_peek_tail(txq);
1605 if (skb) {
1606 msg_set_ack_required(buf_msg(skb));
1607 tsk->expect_ack = true;
1608 } else {
1609 tsk->expect_ack = false;
1610 }
1611 tsk->msg_acc = 0;
1612 tsk->pkt_cnt = 0;
1613 }
1614 } else {
1615 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1616 if (unlikely(rc != send))
1617 break;
1618 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1619 }
1620 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1621 TIPC_DUMP_SK_SNDQ, " ");
1622 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1623 if (unlikely(rc == -ELINKCONG)) {
1624 tsk->cong_link_cnt = 1;
1625 rc = 0;
1626 }
1627 if (likely(!rc)) {
1628 tsk->snt_unacked += blocks;
1629 tsk->snd_backlog = 0;
1630 sent += send;
1631 }
1632 } while (sent < dlen && !rc);
1633
1634 return sent ? sent : rc;
1635}
1636
1637/**
1638 * tipc_send_packet - send a connection-oriented message
1639 * @sock: socket structure
1640 * @m: message to send
1641 * @dsz: length of data to be transmitted
1642 *
1643 * Used for SOCK_SEQPACKET messages.
1644 *
1645 * Return: the number of bytes sent on success, or errno otherwise
1646 */
1647static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1648{
1649 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1650 return -EMSGSIZE;
1651
1652 return tipc_sendstream(sock, m, dsz);
1653}
1654
1655/* tipc_sk_finish_conn - complete the setup of a connection
1656 */
1657static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1658 u32 peer_node)
1659{
1660 struct sock *sk = &tsk->sk;
1661 struct net *net = sock_net(sk);
1662 struct tipc_msg *msg = &tsk->phdr;
1663
1664 msg_set_syn(msg, 0);
1665 msg_set_destnode(msg, peer_node);
1666 msg_set_destport(msg, peer_port);
1667 msg_set_type(msg, TIPC_CONN_MSG);
1668 msg_set_lookup_scope(msg, 0);
1669 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1670
1671 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1672 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1673 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1674 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1675 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1676 tsk_set_nagle(tsk);
1677 __skb_queue_purge(&sk->sk_write_queue);
1678 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1679 return;
1680
1681 /* Fall back to message based flow control */
1682 tsk->rcv_win = FLOWCTL_MSG_WIN;
1683 tsk->snd_win = FLOWCTL_MSG_WIN;
1684}
1685
1686/**
1687 * tipc_sk_set_orig_addr - capture sender's address for received message
1688 * @m: descriptor for message info
1689 * @skb: received message
1690 *
1691 * Note: Address is not captured if not requested by receiver.
1692 */
1693static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1694{
1695 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1696 struct tipc_msg *hdr = buf_msg(skb);
1697
1698 if (!srcaddr)
1699 return;
1700
1701 srcaddr->sock.family = AF_TIPC;
1702 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1703 srcaddr->sock.scope = 0;
1704 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1705 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1706 srcaddr->sock.addr.name.domain = 0;
1707 m->msg_namelen = sizeof(struct sockaddr_tipc);
1708
1709 if (!msg_in_group(hdr))
1710 return;
1711
1712 /* Group message users may also want to know sending member's id */
1713 srcaddr->member.family = AF_TIPC;
1714 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1715 srcaddr->member.scope = 0;
1716 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1717 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1718 srcaddr->member.addr.name.domain = 0;
1719 m->msg_namelen = sizeof(*srcaddr);
1720}
1721
1722/**
1723 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1724 * @m: descriptor for message info
1725 * @skb: received message buffer
1726 * @tsk: TIPC port associated with message
1727 *
1728 * Note: Ancillary data is not captured if not requested by receiver.
1729 *
1730 * Return: 0 if successful, otherwise errno
1731 */
1732static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1733 struct tipc_sock *tsk)
1734{
1735 struct tipc_msg *hdr;
1736 u32 data[3] = {0,};
1737 bool has_addr;
1738 int dlen, rc;
1739
1740 if (likely(m->msg_controllen == 0))
1741 return 0;
1742
1743 hdr = buf_msg(skb);
1744 dlen = msg_data_sz(hdr);
1745
1746 /* Capture errored message object, if any */
1747 if (msg_errcode(hdr)) {
1748 if (skb_linearize(skb))
1749 return -ENOMEM;
1750 hdr = buf_msg(skb);
1751 data[0] = msg_errcode(hdr);
1752 data[1] = dlen;
1753 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1754 if (rc || !dlen)
1755 return rc;
1756 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1757 if (rc)
1758 return rc;
1759 }
1760
1761 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1762 switch (msg_type(hdr)) {
1763 case TIPC_NAMED_MSG:
1764 has_addr = true;
1765 data[0] = msg_nametype(hdr);
1766 data[1] = msg_namelower(hdr);
1767 data[2] = data[1];
1768 break;
1769 case TIPC_MCAST_MSG:
1770 has_addr = true;
1771 data[0] = msg_nametype(hdr);
1772 data[1] = msg_namelower(hdr);
1773 data[2] = msg_nameupper(hdr);
1774 break;
1775 case TIPC_CONN_MSG:
1776 has_addr = !!tsk->conn_addrtype;
1777 data[0] = msg_nametype(&tsk->phdr);
1778 data[1] = msg_nameinst(&tsk->phdr);
1779 data[2] = data[1];
1780 break;
1781 default:
1782 has_addr = false;
1783 }
1784 if (!has_addr)
1785 return 0;
1786 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1787}
1788
1789static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1790{
1791 struct sock *sk = &tsk->sk;
1792 struct sk_buff *skb = NULL;
1793 struct tipc_msg *msg;
1794 u32 peer_port = tsk_peer_port(tsk);
1795 u32 dnode = tsk_peer_node(tsk);
1796
1797 if (!tipc_sk_connected(sk))
1798 return NULL;
1799 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1800 dnode, tsk_own_node(tsk), peer_port,
1801 tsk->portid, TIPC_OK);
1802 if (!skb)
1803 return NULL;
1804 msg = buf_msg(skb);
1805 msg_set_conn_ack(msg, tsk->rcv_unacked);
1806 tsk->rcv_unacked = 0;
1807
1808 /* Adjust to and advertize the correct window limit */
1809 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1810 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1811 msg_set_adv_win(msg, tsk->rcv_win);
1812 }
1813 return skb;
1814}
1815
1816static void tipc_sk_send_ack(struct tipc_sock *tsk)
1817{
1818 struct sk_buff *skb;
1819
1820 skb = tipc_sk_build_ack(tsk);
1821 if (!skb)
1822 return;
1823
1824 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1825 msg_link_selector(buf_msg(skb)));
1826}
1827
1828static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1829{
1830 struct sock *sk = sock->sk;
1831 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1832 long timeo = *timeop;
1833 int err = sock_error(sk);
1834
1835 if (err)
1836 return err;
1837
1838 for (;;) {
1839 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1840 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1841 err = -ENOTCONN;
1842 break;
1843 }
1844 add_wait_queue(sk_sleep(sk), &wait);
1845 release_sock(sk);
1846 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1847 sched_annotate_sleep();
1848 lock_sock(sk);
1849 remove_wait_queue(sk_sleep(sk), &wait);
1850 }
1851 err = 0;
1852 if (!skb_queue_empty(&sk->sk_receive_queue))
1853 break;
1854 err = -EAGAIN;
1855 if (!timeo)
1856 break;
1857 err = sock_intr_errno(timeo);
1858 if (signal_pending(current))
1859 break;
1860
1861 err = sock_error(sk);
1862 if (err)
1863 break;
1864 }
1865 *timeop = timeo;
1866 return err;
1867}
1868
1869/**
1870 * tipc_recvmsg - receive packet-oriented message
1871 * @sock: network socket
1872 * @m: descriptor for message info
1873 * @buflen: length of user buffer area
1874 * @flags: receive flags
1875 *
1876 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1877 * If the complete message doesn't fit in user area, truncate it.
1878 *
1879 * Return: size of returned message data, errno otherwise
1880 */
1881static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1882 size_t buflen, int flags)
1883{
1884 struct sock *sk = sock->sk;
1885 bool connected = !tipc_sk_type_connectionless(sk);
1886 struct tipc_sock *tsk = tipc_sk(sk);
1887 int rc, err, hlen, dlen, copy;
1888 struct tipc_skb_cb *skb_cb;
1889 struct sk_buff_head xmitq;
1890 struct tipc_msg *hdr;
1891 struct sk_buff *skb;
1892 bool grp_evt;
1893 long timeout;
1894
1895 /* Catch invalid receive requests */
1896 if (unlikely(!buflen))
1897 return -EINVAL;
1898
1899 lock_sock(sk);
1900 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1901 rc = -ENOTCONN;
1902 goto exit;
1903 }
1904 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1905
1906 /* Step rcv queue to first msg with data or error; wait if necessary */
1907 do {
1908 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1909 if (unlikely(rc))
1910 goto exit;
1911 skb = skb_peek(&sk->sk_receive_queue);
1912 skb_cb = TIPC_SKB_CB(skb);
1913 hdr = buf_msg(skb);
1914 dlen = msg_data_sz(hdr);
1915 hlen = msg_hdr_sz(hdr);
1916 err = msg_errcode(hdr);
1917 grp_evt = msg_is_grp_evt(hdr);
1918 if (likely(dlen || err))
1919 break;
1920 tsk_advance_rx_queue(sk);
1921 } while (1);
1922
1923 /* Collect msg meta data, including error code and rejected data */
1924 tipc_sk_set_orig_addr(m, skb);
1925 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1926 if (unlikely(rc))
1927 goto exit;
1928 hdr = buf_msg(skb);
1929
1930 /* Capture data if non-error msg, otherwise just set return value */
1931 if (likely(!err)) {
1932 int offset = skb_cb->bytes_read;
1933
1934 copy = min_t(int, dlen - offset, buflen);
1935 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1936 if (unlikely(rc))
1937 goto exit;
1938 if (unlikely(offset + copy < dlen)) {
1939 if (flags & MSG_EOR) {
1940 if (!(flags & MSG_PEEK))
1941 skb_cb->bytes_read = offset + copy;
1942 } else {
1943 m->msg_flags |= MSG_TRUNC;
1944 skb_cb->bytes_read = 0;
1945 }
1946 } else {
1947 if (flags & MSG_EOR)
1948 m->msg_flags |= MSG_EOR;
1949 skb_cb->bytes_read = 0;
1950 }
1951 } else {
1952 copy = 0;
1953 rc = 0;
1954 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) {
1955 rc = -ECONNRESET;
1956 goto exit;
1957 }
1958 }
1959
1960 /* Mark message as group event if applicable */
1961 if (unlikely(grp_evt)) {
1962 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1963 m->msg_flags |= MSG_EOR;
1964 m->msg_flags |= MSG_OOB;
1965 copy = 0;
1966 }
1967
1968 /* Caption of data or error code/rejected data was successful */
1969 if (unlikely(flags & MSG_PEEK))
1970 goto exit;
1971
1972 /* Send group flow control advertisement when applicable */
1973 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1974 __skb_queue_head_init(&xmitq);
1975 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1976 msg_orignode(hdr), msg_origport(hdr),
1977 &xmitq);
1978 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1979 }
1980
1981 if (skb_cb->bytes_read)
1982 goto exit;
1983
1984 tsk_advance_rx_queue(sk);
1985
1986 if (likely(!connected))
1987 goto exit;
1988
1989 /* Send connection flow control advertisement when applicable */
1990 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1991 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1992 tipc_sk_send_ack(tsk);
1993exit:
1994 release_sock(sk);
1995 return rc ? rc : copy;
1996}
1997
1998/**
1999 * tipc_recvstream - receive stream-oriented data
2000 * @sock: network socket
2001 * @m: descriptor for message info
2002 * @buflen: total size of user buffer area
2003 * @flags: receive flags
2004 *
2005 * Used for SOCK_STREAM messages only. If not enough data is available
2006 * will optionally wait for more; never truncates data.
2007 *
2008 * Return: size of returned message data, errno otherwise
2009 */
2010static int tipc_recvstream(struct socket *sock, struct msghdr *m,
2011 size_t buflen, int flags)
2012{
2013 struct sock *sk = sock->sk;
2014 struct tipc_sock *tsk = tipc_sk(sk);
2015 struct sk_buff *skb;
2016 struct tipc_msg *hdr;
2017 struct tipc_skb_cb *skb_cb;
2018 bool peek = flags & MSG_PEEK;
2019 int offset, required, copy, copied = 0;
2020 int hlen, dlen, err, rc;
2021 long timeout;
2022
2023 /* Catch invalid receive attempts */
2024 if (unlikely(!buflen))
2025 return -EINVAL;
2026
2027 lock_sock(sk);
2028
2029 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2030 rc = -ENOTCONN;
2031 goto exit;
2032 }
2033 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2034 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2035
2036 do {
2037 /* Look at first msg in receive queue; wait if necessary */
2038 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2039 if (unlikely(rc))
2040 break;
2041 skb = skb_peek(&sk->sk_receive_queue);
2042 skb_cb = TIPC_SKB_CB(skb);
2043 hdr = buf_msg(skb);
2044 dlen = msg_data_sz(hdr);
2045 hlen = msg_hdr_sz(hdr);
2046 err = msg_errcode(hdr);
2047
2048 /* Discard any empty non-errored (SYN-) message */
2049 if (unlikely(!dlen && !err)) {
2050 tsk_advance_rx_queue(sk);
2051 continue;
2052 }
2053
2054 /* Collect msg meta data, incl. error code and rejected data */
2055 if (!copied) {
2056 tipc_sk_set_orig_addr(m, skb);
2057 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2058 if (rc)
2059 break;
2060 hdr = buf_msg(skb);
2061 }
2062
2063 /* Copy data if msg ok, otherwise return error/partial data */
2064 if (likely(!err)) {
2065 offset = skb_cb->bytes_read;
2066 copy = min_t(int, dlen - offset, buflen - copied);
2067 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2068 if (unlikely(rc))
2069 break;
2070 copied += copy;
2071 offset += copy;
2072 if (unlikely(offset < dlen)) {
2073 if (!peek)
2074 skb_cb->bytes_read = offset;
2075 break;
2076 }
2077 } else {
2078 rc = 0;
2079 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2080 rc = -ECONNRESET;
2081 if (copied || rc)
2082 break;
2083 }
2084
2085 if (unlikely(peek))
2086 break;
2087
2088 tsk_advance_rx_queue(sk);
2089
2090 /* Send connection flow control advertisement when applicable */
2091 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2092 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2093 tipc_sk_send_ack(tsk);
2094
2095 /* Exit if all requested data or FIN/error received */
2096 if (copied == buflen || err)
2097 break;
2098
2099 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2100exit:
2101 release_sock(sk);
2102 return copied ? copied : rc;
2103}
2104
2105/**
2106 * tipc_write_space - wake up thread if port congestion is released
2107 * @sk: socket
2108 */
2109static void tipc_write_space(struct sock *sk)
2110{
2111 struct socket_wq *wq;
2112
2113 rcu_read_lock();
2114 wq = rcu_dereference(sk->sk_wq);
2115 if (skwq_has_sleeper(wq))
2116 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2117 EPOLLWRNORM | EPOLLWRBAND);
2118 rcu_read_unlock();
2119}
2120
2121/**
2122 * tipc_data_ready - wake up threads to indicate messages have been received
2123 * @sk: socket
2124 */
2125static void tipc_data_ready(struct sock *sk)
2126{
2127 struct socket_wq *wq;
2128
2129 trace_sk_data_ready(sk);
2130
2131 rcu_read_lock();
2132 wq = rcu_dereference(sk->sk_wq);
2133 if (skwq_has_sleeper(wq))
2134 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2135 EPOLLRDNORM | EPOLLRDBAND);
2136 rcu_read_unlock();
2137}
2138
2139static void tipc_sock_destruct(struct sock *sk)
2140{
2141 __skb_queue_purge(&sk->sk_receive_queue);
2142}
2143
2144static void tipc_sk_proto_rcv(struct sock *sk,
2145 struct sk_buff_head *inputq,
2146 struct sk_buff_head *xmitq)
2147{
2148 struct sk_buff *skb = __skb_dequeue(inputq);
2149 struct tipc_sock *tsk = tipc_sk(sk);
2150 struct tipc_msg *hdr = buf_msg(skb);
2151 struct tipc_group *grp = tsk->group;
2152 bool wakeup = false;
2153
2154 switch (msg_user(hdr)) {
2155 case CONN_MANAGER:
2156 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2157 return;
2158 case SOCK_WAKEUP:
2159 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2160 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2161 smp_wmb();
2162 tsk->cong_link_cnt--;
2163 wakeup = true;
2164 tipc_sk_push_backlog(tsk, false);
2165 break;
2166 case GROUP_PROTOCOL:
2167 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2168 break;
2169 case TOP_SRV:
2170 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2171 hdr, inputq, xmitq);
2172 break;
2173 default:
2174 break;
2175 }
2176
2177 if (wakeup)
2178 sk->sk_write_space(sk);
2179
2180 kfree_skb(skb);
2181}
2182
2183/**
2184 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2185 * @tsk: TIPC socket
2186 * @skb: pointer to message buffer.
2187 * @xmitq: for Nagle ACK if any
2188 * Return: true if message should be added to receive queue, false otherwise
2189 */
2190static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2191 struct sk_buff_head *xmitq)
2192{
2193 struct sock *sk = &tsk->sk;
2194 struct net *net = sock_net(sk);
2195 struct tipc_msg *hdr = buf_msg(skb);
2196 bool con_msg = msg_connected(hdr);
2197 u32 pport = tsk_peer_port(tsk);
2198 u32 pnode = tsk_peer_node(tsk);
2199 u32 oport = msg_origport(hdr);
2200 u32 onode = msg_orignode(hdr);
2201 int err = msg_errcode(hdr);
2202 unsigned long delay;
2203
2204 if (unlikely(msg_mcast(hdr)))
2205 return false;
2206 tsk->oneway = 0;
2207
2208 switch (sk->sk_state) {
2209 case TIPC_CONNECTING:
2210 /* Setup ACK */
2211 if (likely(con_msg)) {
2212 if (err)
2213 break;
2214 tipc_sk_finish_conn(tsk, oport, onode);
2215 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2216 /* ACK+ message with data is added to receive queue */
2217 if (msg_data_sz(hdr))
2218 return true;
2219 /* Empty ACK-, - wake up sleeping connect() and drop */
2220 sk->sk_state_change(sk);
2221 msg_set_dest_droppable(hdr, 1);
2222 return false;
2223 }
2224 /* Ignore connectionless message if not from listening socket */
2225 if (oport != pport || onode != pnode)
2226 return false;
2227
2228 /* Rejected SYN */
2229 if (err != TIPC_ERR_OVERLOAD)
2230 break;
2231
2232 /* Prepare for new setup attempt if we have a SYN clone */
2233 if (skb_queue_empty(&sk->sk_write_queue))
2234 break;
2235 get_random_bytes(&delay, 2);
2236 delay %= (tsk->conn_timeout / 4);
2237 delay = msecs_to_jiffies(delay + 100);
2238 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2239 return false;
2240 case TIPC_OPEN:
2241 case TIPC_DISCONNECTING:
2242 return false;
2243 case TIPC_LISTEN:
2244 /* Accept only SYN message */
2245 if (!msg_is_syn(hdr) &&
2246 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2247 return false;
2248 if (!con_msg && !err)
2249 return true;
2250 return false;
2251 case TIPC_ESTABLISHED:
2252 if (!skb_queue_empty(&sk->sk_write_queue))
2253 tipc_sk_push_backlog(tsk, false);
2254 /* Accept only connection-based messages sent by peer */
2255 if (likely(con_msg && !err && pport == oport &&
2256 pnode == onode)) {
2257 if (msg_ack_required(hdr)) {
2258 struct sk_buff *skb;
2259
2260 skb = tipc_sk_build_ack(tsk);
2261 if (skb) {
2262 msg_set_nagle_ack(buf_msg(skb));
2263 __skb_queue_tail(xmitq, skb);
2264 }
2265 }
2266 return true;
2267 }
2268 if (!tsk_peer_msg(tsk, hdr))
2269 return false;
2270 if (!err)
2271 return true;
2272 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2273 tipc_node_remove_conn(net, pnode, tsk->portid);
2274 sk->sk_state_change(sk);
2275 return true;
2276 default:
2277 pr_err("Unknown sk_state %u\n", sk->sk_state);
2278 }
2279 /* Abort connection setup attempt */
2280 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2281 sk->sk_err = ECONNREFUSED;
2282 sk->sk_state_change(sk);
2283 return true;
2284}
2285
2286/**
2287 * rcvbuf_limit - get proper overload limit of socket receive queue
2288 * @sk: socket
2289 * @skb: message
2290 *
2291 * For connection oriented messages, irrespective of importance,
2292 * default queue limit is 2 MB.
2293 *
2294 * For connectionless messages, queue limits are based on message
2295 * importance as follows:
2296 *
2297 * TIPC_LOW_IMPORTANCE (2 MB)
2298 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2299 * TIPC_HIGH_IMPORTANCE (8 MB)
2300 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2301 *
2302 * Return: overload limit according to corresponding message importance
2303 */
2304static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2305{
2306 struct tipc_sock *tsk = tipc_sk(sk);
2307 struct tipc_msg *hdr = buf_msg(skb);
2308
2309 if (unlikely(msg_in_group(hdr)))
2310 return READ_ONCE(sk->sk_rcvbuf);
2311
2312 if (unlikely(!msg_connected(hdr)))
2313 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2314
2315 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2316 return READ_ONCE(sk->sk_rcvbuf);
2317
2318 return FLOWCTL_MSG_LIM;
2319}
2320
2321/**
2322 * tipc_sk_filter_rcv - validate incoming message
2323 * @sk: socket
2324 * @skb: pointer to message.
2325 * @xmitq: output message area (FIXME)
2326 *
2327 * Enqueues message on receive queue if acceptable; optionally handles
2328 * disconnect indication for a connected socket.
2329 *
2330 * Called with socket lock already taken
2331 */
2332static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2333 struct sk_buff_head *xmitq)
2334{
2335 bool sk_conn = !tipc_sk_type_connectionless(sk);
2336 struct tipc_sock *tsk = tipc_sk(sk);
2337 struct tipc_group *grp = tsk->group;
2338 struct tipc_msg *hdr = buf_msg(skb);
2339 struct net *net = sock_net(sk);
2340 struct sk_buff_head inputq;
2341 int mtyp = msg_type(hdr);
2342 int limit, err = TIPC_OK;
2343
2344 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2345 TIPC_SKB_CB(skb)->bytes_read = 0;
2346 __skb_queue_head_init(&inputq);
2347 __skb_queue_tail(&inputq, skb);
2348
2349 if (unlikely(!msg_isdata(hdr)))
2350 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2351
2352 if (unlikely(grp))
2353 tipc_group_filter_msg(grp, &inputq, xmitq);
2354
2355 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2356 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2357
2358 /* Validate and add to receive buffer if there is space */
2359 while ((skb = __skb_dequeue(&inputq))) {
2360 hdr = buf_msg(skb);
2361 limit = rcvbuf_limit(sk, skb);
2362 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2363 (!sk_conn && msg_connected(hdr)) ||
2364 (!grp && msg_in_group(hdr)))
2365 err = TIPC_ERR_NO_PORT;
2366 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2367 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2368 "err_overload2!");
2369 atomic_inc(&sk->sk_drops);
2370 err = TIPC_ERR_OVERLOAD;
2371 }
2372
2373 if (unlikely(err)) {
2374 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2375 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2376 "@filter_rcv!");
2377 __skb_queue_tail(xmitq, skb);
2378 }
2379 err = TIPC_OK;
2380 continue;
2381 }
2382 __skb_queue_tail(&sk->sk_receive_queue, skb);
2383 skb_set_owner_r(skb, sk);
2384 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2385 "rcvq >90% allocated!");
2386 sk->sk_data_ready(sk);
2387 }
2388}
2389
2390/**
2391 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2392 * @sk: socket
2393 * @skb: message
2394 *
2395 * Caller must hold socket lock
2396 */
2397static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2398{
2399 unsigned int before = sk_rmem_alloc_get(sk);
2400 struct sk_buff_head xmitq;
2401 unsigned int added;
2402
2403 __skb_queue_head_init(&xmitq);
2404
2405 tipc_sk_filter_rcv(sk, skb, &xmitq);
2406 added = sk_rmem_alloc_get(sk) - before;
2407 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2408
2409 /* Send pending response/rejected messages, if any */
2410 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2411 return 0;
2412}
2413
2414/**
2415 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2416 * inputq and try adding them to socket or backlog queue
2417 * @inputq: list of incoming buffers with potentially different destinations
2418 * @sk: socket where the buffers should be enqueued
2419 * @dport: port number for the socket
2420 * @xmitq: output queue
2421 *
2422 * Caller must hold socket lock
2423 */
2424static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2425 u32 dport, struct sk_buff_head *xmitq)
2426{
2427 unsigned long time_limit = jiffies + usecs_to_jiffies(20000);
2428 struct sk_buff *skb;
2429 unsigned int lim;
2430 atomic_t *dcnt;
2431 u32 onode;
2432
2433 while (skb_queue_len(inputq)) {
2434 if (unlikely(time_after_eq(jiffies, time_limit)))
2435 return;
2436
2437 skb = tipc_skb_dequeue(inputq, dport);
2438 if (unlikely(!skb))
2439 return;
2440
2441 /* Add message directly to receive queue if possible */
2442 if (!sock_owned_by_user(sk)) {
2443 tipc_sk_filter_rcv(sk, skb, xmitq);
2444 continue;
2445 }
2446
2447 /* Try backlog, compensating for double-counted bytes */
2448 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2449 if (!sk->sk_backlog.len)
2450 atomic_set(dcnt, 0);
2451 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2452 if (likely(!sk_add_backlog(sk, skb, lim))) {
2453 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2454 "bklg & rcvq >90% allocated!");
2455 continue;
2456 }
2457
2458 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2459 /* Overload => reject message back to sender */
2460 onode = tipc_own_addr(sock_net(sk));
2461 atomic_inc(&sk->sk_drops);
2462 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2463 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2464 "@sk_enqueue!");
2465 __skb_queue_tail(xmitq, skb);
2466 }
2467 break;
2468 }
2469}
2470
2471/**
2472 * tipc_sk_rcv - handle a chain of incoming buffers
2473 * @net: the associated network namespace
2474 * @inputq: buffer list containing the buffers
2475 * Consumes all buffers in list until inputq is empty
2476 * Note: may be called in multiple threads referring to the same queue
2477 */
2478void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2479{
2480 struct sk_buff_head xmitq;
2481 u32 dnode, dport = 0;
2482 int err;
2483 struct tipc_sock *tsk;
2484 struct sock *sk;
2485 struct sk_buff *skb;
2486
2487 __skb_queue_head_init(&xmitq);
2488 while (skb_queue_len(inputq)) {
2489 dport = tipc_skb_peek_port(inputq, dport);
2490 tsk = tipc_sk_lookup(net, dport);
2491
2492 if (likely(tsk)) {
2493 sk = &tsk->sk;
2494 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2495 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2496 spin_unlock_bh(&sk->sk_lock.slock);
2497 }
2498 /* Send pending response/rejected messages, if any */
2499 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2500 sock_put(sk);
2501 continue;
2502 }
2503 /* No destination socket => dequeue skb if still there */
2504 skb = tipc_skb_dequeue(inputq, dport);
2505 if (!skb)
2506 return;
2507
2508 /* Try secondary lookup if unresolved named message */
2509 err = TIPC_ERR_NO_PORT;
2510 if (tipc_msg_lookup_dest(net, skb, &err))
2511 goto xmit;
2512
2513 /* Prepare for message rejection */
2514 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2515 continue;
2516
2517 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2518xmit:
2519 dnode = msg_destnode(buf_msg(skb));
2520 tipc_node_xmit_skb(net, skb, dnode, dport);
2521 }
2522}
2523
2524static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2525{
2526 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2527 struct sock *sk = sock->sk;
2528 int done;
2529
2530 do {
2531 int err = sock_error(sk);
2532 if (err)
2533 return err;
2534 if (!*timeo_p)
2535 return -ETIMEDOUT;
2536 if (signal_pending(current))
2537 return sock_intr_errno(*timeo_p);
2538 if (sk->sk_state == TIPC_DISCONNECTING)
2539 break;
2540
2541 add_wait_queue(sk_sleep(sk), &wait);
2542 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2543 &wait);
2544 remove_wait_queue(sk_sleep(sk), &wait);
2545 } while (!done);
2546 return 0;
2547}
2548
2549static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2550{
2551 if (addr->family != AF_TIPC)
2552 return false;
2553 if (addr->addrtype == TIPC_SERVICE_RANGE)
2554 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2555 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2556 addr->addrtype == TIPC_SOCKET_ADDR);
2557}
2558
2559/**
2560 * tipc_connect - establish a connection to another TIPC port
2561 * @sock: socket structure
2562 * @dest: socket address for destination port
2563 * @destlen: size of socket address data structure
2564 * @flags: file-related flags associated with socket
2565 *
2566 * Return: 0 on success, errno otherwise
2567 */
2568static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2569 int destlen, int flags)
2570{
2571 struct sock *sk = sock->sk;
2572 struct tipc_sock *tsk = tipc_sk(sk);
2573 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2574 struct msghdr m = {NULL,};
2575 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2576 int previous;
2577 int res = 0;
2578
2579 if (destlen != sizeof(struct sockaddr_tipc))
2580 return -EINVAL;
2581
2582 lock_sock(sk);
2583
2584 if (tsk->group) {
2585 res = -EINVAL;
2586 goto exit;
2587 }
2588
2589 if (dst->family == AF_UNSPEC) {
2590 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2591 if (!tipc_sk_type_connectionless(sk))
2592 res = -EINVAL;
2593 goto exit;
2594 }
2595 if (!tipc_sockaddr_is_sane(dst)) {
2596 res = -EINVAL;
2597 goto exit;
2598 }
2599 /* DGRAM/RDM connect(), just save the destaddr */
2600 if (tipc_sk_type_connectionless(sk)) {
2601 memcpy(&tsk->peer, dest, destlen);
2602 goto exit;
2603 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2604 res = -EINVAL;
2605 goto exit;
2606 }
2607
2608 previous = sk->sk_state;
2609
2610 switch (sk->sk_state) {
2611 case TIPC_OPEN:
2612 /* Send a 'SYN-' to destination */
2613 m.msg_name = dest;
2614 m.msg_namelen = destlen;
2615 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2616
2617 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2618 * indicate send_msg() is never blocked.
2619 */
2620 if (!timeout)
2621 m.msg_flags = MSG_DONTWAIT;
2622
2623 res = __tipc_sendmsg(sock, &m, 0);
2624 if ((res < 0) && (res != -EWOULDBLOCK))
2625 goto exit;
2626
2627 /* Just entered TIPC_CONNECTING state; the only
2628 * difference is that return value in non-blocking
2629 * case is EINPROGRESS, rather than EALREADY.
2630 */
2631 res = -EINPROGRESS;
2632 fallthrough;
2633 case TIPC_CONNECTING:
2634 if (!timeout) {
2635 if (previous == TIPC_CONNECTING)
2636 res = -EALREADY;
2637 goto exit;
2638 }
2639 timeout = msecs_to_jiffies(timeout);
2640 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2641 res = tipc_wait_for_connect(sock, &timeout);
2642 break;
2643 case TIPC_ESTABLISHED:
2644 res = -EISCONN;
2645 break;
2646 default:
2647 res = -EINVAL;
2648 }
2649
2650exit:
2651 release_sock(sk);
2652 return res;
2653}
2654
2655/**
2656 * tipc_listen - allow socket to listen for incoming connections
2657 * @sock: socket structure
2658 * @len: (unused)
2659 *
2660 * Return: 0 on success, errno otherwise
2661 */
2662static int tipc_listen(struct socket *sock, int len)
2663{
2664 struct sock *sk = sock->sk;
2665 int res;
2666
2667 lock_sock(sk);
2668 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2669 release_sock(sk);
2670
2671 return res;
2672}
2673
2674static int tipc_wait_for_accept(struct socket *sock, long timeo)
2675{
2676 struct sock *sk = sock->sk;
2677 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2678 int err;
2679
2680 /* True wake-one mechanism for incoming connections: only
2681 * one process gets woken up, not the 'whole herd'.
2682 * Since we do not 'race & poll' for established sockets
2683 * anymore, the common case will execute the loop only once.
2684 */
2685 for (;;) {
2686 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2687 add_wait_queue(sk_sleep(sk), &wait);
2688 release_sock(sk);
2689 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
2690 lock_sock(sk);
2691 remove_wait_queue(sk_sleep(sk), &wait);
2692 }
2693 err = 0;
2694 if (!skb_queue_empty(&sk->sk_receive_queue))
2695 break;
2696 err = -EAGAIN;
2697 if (!timeo)
2698 break;
2699 err = sock_intr_errno(timeo);
2700 if (signal_pending(current))
2701 break;
2702 }
2703 return err;
2704}
2705
2706/**
2707 * tipc_accept - wait for connection request
2708 * @sock: listening socket
2709 * @new_sock: new socket that is to be connected
2710 * @arg: arguments for accept
2711 *
2712 * Return: 0 on success, errno otherwise
2713 */
2714static int tipc_accept(struct socket *sock, struct socket *new_sock,
2715 struct proto_accept_arg *arg)
2716{
2717 struct sock *new_sk, *sk = sock->sk;
2718 struct tipc_sock *new_tsock;
2719 struct msghdr m = {NULL,};
2720 struct tipc_msg *msg;
2721 struct sk_buff *buf;
2722 long timeo;
2723 int res;
2724
2725 lock_sock(sk);
2726
2727 if (sk->sk_state != TIPC_LISTEN) {
2728 res = -EINVAL;
2729 goto exit;
2730 }
2731 timeo = sock_rcvtimeo(sk, arg->flags & O_NONBLOCK);
2732 res = tipc_wait_for_accept(sock, timeo);
2733 if (res)
2734 goto exit;
2735
2736 buf = skb_peek(&sk->sk_receive_queue);
2737
2738 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, arg->kern);
2739 if (res)
2740 goto exit;
2741 security_sk_clone(sock->sk, new_sock->sk);
2742
2743 new_sk = new_sock->sk;
2744 new_tsock = tipc_sk(new_sk);
2745 msg = buf_msg(buf);
2746
2747 /* we lock on new_sk; but lockdep sees the lock on sk */
2748 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2749
2750 /*
2751 * Reject any stray messages received by new socket
2752 * before the socket lock was taken (very, very unlikely)
2753 */
2754 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2755
2756 /* Connect new socket to it's peer */
2757 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2758
2759 tsk_set_importance(new_sk, msg_importance(msg));
2760 if (msg_named(msg)) {
2761 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2762 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2763 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2764 }
2765
2766 /*
2767 * Respond to 'SYN-' by discarding it & returning 'ACK'.
2768 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'.
2769 */
2770 if (!msg_data_sz(msg)) {
2771 tsk_advance_rx_queue(sk);
2772 } else {
2773 __skb_dequeue(&sk->sk_receive_queue);
2774 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2775 skb_set_owner_r(buf, new_sk);
2776 }
2777 iov_iter_kvec(&m.msg_iter, ITER_SOURCE, NULL, 0, 0);
2778 __tipc_sendstream(new_sock, &m, 0);
2779 release_sock(new_sk);
2780exit:
2781 release_sock(sk);
2782 return res;
2783}
2784
2785/**
2786 * tipc_shutdown - shutdown socket connection
2787 * @sock: socket structure
2788 * @how: direction to close (must be SHUT_RDWR)
2789 *
2790 * Terminates connection (if necessary), then purges socket's receive queue.
2791 *
2792 * Return: 0 on success, errno otherwise
2793 */
2794static int tipc_shutdown(struct socket *sock, int how)
2795{
2796 struct sock *sk = sock->sk;
2797 int res;
2798
2799 if (how != SHUT_RDWR)
2800 return -EINVAL;
2801
2802 lock_sock(sk);
2803
2804 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2805 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2806 sk->sk_shutdown = SHUTDOWN_MASK;
2807
2808 if (sk->sk_state == TIPC_DISCONNECTING) {
2809 /* Discard any unreceived messages */
2810 __skb_queue_purge(&sk->sk_receive_queue);
2811
2812 res = 0;
2813 } else {
2814 res = -ENOTCONN;
2815 }
2816 /* Wake up anyone sleeping in poll. */
2817 sk->sk_state_change(sk);
2818
2819 release_sock(sk);
2820 return res;
2821}
2822
2823static void tipc_sk_check_probing_state(struct sock *sk,
2824 struct sk_buff_head *list)
2825{
2826 struct tipc_sock *tsk = tipc_sk(sk);
2827 u32 pnode = tsk_peer_node(tsk);
2828 u32 pport = tsk_peer_port(tsk);
2829 u32 self = tsk_own_node(tsk);
2830 u32 oport = tsk->portid;
2831 struct sk_buff *skb;
2832
2833 if (tsk->probe_unacked) {
2834 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2835 sk->sk_err = ECONNABORTED;
2836 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2837 sk->sk_state_change(sk);
2838 return;
2839 }
2840 /* Prepare new probe */
2841 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2842 pnode, self, pport, oport, TIPC_OK);
2843 if (skb)
2844 __skb_queue_tail(list, skb);
2845 tsk->probe_unacked = true;
2846 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2847}
2848
2849static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2850{
2851 struct tipc_sock *tsk = tipc_sk(sk);
2852
2853 /* Try again later if dest link is congested */
2854 if (tsk->cong_link_cnt) {
2855 sk_reset_timer(sk, &sk->sk_timer,
2856 jiffies + msecs_to_jiffies(100));
2857 return;
2858 }
2859 /* Prepare SYN for retransmit */
2860 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2861}
2862
2863static void tipc_sk_timeout(struct timer_list *t)
2864{
2865 struct sock *sk = from_timer(sk, t, sk_timer);
2866 struct tipc_sock *tsk = tipc_sk(sk);
2867 u32 pnode = tsk_peer_node(tsk);
2868 struct sk_buff_head list;
2869 int rc = 0;
2870
2871 __skb_queue_head_init(&list);
2872 bh_lock_sock(sk);
2873
2874 /* Try again later if socket is busy */
2875 if (sock_owned_by_user(sk)) {
2876 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2877 bh_unlock_sock(sk);
2878 sock_put(sk);
2879 return;
2880 }
2881
2882 if (sk->sk_state == TIPC_ESTABLISHED)
2883 tipc_sk_check_probing_state(sk, &list);
2884 else if (sk->sk_state == TIPC_CONNECTING)
2885 tipc_sk_retry_connect(sk, &list);
2886
2887 bh_unlock_sock(sk);
2888
2889 if (!skb_queue_empty(&list))
2890 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2891
2892 /* SYN messages may cause link congestion */
2893 if (rc == -ELINKCONG) {
2894 tipc_dest_push(&tsk->cong_links, pnode, 0);
2895 tsk->cong_link_cnt = 1;
2896 }
2897 sock_put(sk);
2898}
2899
2900static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2901{
2902 struct sock *sk = &tsk->sk;
2903 struct net *net = sock_net(sk);
2904 struct tipc_socket_addr skaddr;
2905 struct publication *p;
2906 u32 key;
2907
2908 if (tipc_sk_connected(sk))
2909 return -EINVAL;
2910 key = tsk->portid + tsk->pub_count + 1;
2911 if (key == tsk->portid)
2912 return -EADDRINUSE;
2913 skaddr.ref = tsk->portid;
2914 skaddr.node = tipc_own_addr(net);
2915 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2916 if (unlikely(!p))
2917 return -EINVAL;
2918
2919 list_add(&p->binding_sock, &tsk->publications);
2920 tsk->pub_count++;
2921 tsk->published = true;
2922 return 0;
2923}
2924
2925static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2926{
2927 struct net *net = sock_net(&tsk->sk);
2928 struct publication *safe, *p;
2929 struct tipc_uaddr _ua;
2930 int rc = -EINVAL;
2931
2932 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2933 if (!ua) {
2934 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2935 p->sr.type, p->sr.lower, p->sr.upper);
2936 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2937 continue;
2938 }
2939 /* Unbind specific publication */
2940 if (p->scope != ua->scope)
2941 continue;
2942 if (p->sr.type != ua->sr.type)
2943 continue;
2944 if (p->sr.lower != ua->sr.lower)
2945 continue;
2946 if (p->sr.upper != ua->sr.upper)
2947 break;
2948 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2949 rc = 0;
2950 break;
2951 }
2952 if (list_empty(&tsk->publications)) {
2953 tsk->published = 0;
2954 rc = 0;
2955 }
2956 return rc;
2957}
2958
2959/* tipc_sk_reinit: set non-zero address in all existing sockets
2960 * when we go from standalone to network mode.
2961 */
2962void tipc_sk_reinit(struct net *net)
2963{
2964 struct tipc_net *tn = net_generic(net, tipc_net_id);
2965 struct rhashtable_iter iter;
2966 struct tipc_sock *tsk;
2967 struct tipc_msg *msg;
2968
2969 rhashtable_walk_enter(&tn->sk_rht, &iter);
2970
2971 do {
2972 rhashtable_walk_start(&iter);
2973
2974 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2975 sock_hold(&tsk->sk);
2976 rhashtable_walk_stop(&iter);
2977 lock_sock(&tsk->sk);
2978 msg = &tsk->phdr;
2979 msg_set_prevnode(msg, tipc_own_addr(net));
2980 msg_set_orignode(msg, tipc_own_addr(net));
2981 release_sock(&tsk->sk);
2982 rhashtable_walk_start(&iter);
2983 sock_put(&tsk->sk);
2984 }
2985
2986 rhashtable_walk_stop(&iter);
2987 } while (tsk == ERR_PTR(-EAGAIN));
2988
2989 rhashtable_walk_exit(&iter);
2990}
2991
2992static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2993{
2994 struct tipc_net *tn = net_generic(net, tipc_net_id);
2995 struct tipc_sock *tsk;
2996
2997 rcu_read_lock();
2998 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
2999 if (tsk)
3000 sock_hold(&tsk->sk);
3001 rcu_read_unlock();
3002
3003 return tsk;
3004}
3005
3006static int tipc_sk_insert(struct tipc_sock *tsk)
3007{
3008 struct sock *sk = &tsk->sk;
3009 struct net *net = sock_net(sk);
3010 struct tipc_net *tn = net_generic(net, tipc_net_id);
3011 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
3012 u32 portid = get_random_u32_below(remaining) + TIPC_MIN_PORT;
3013
3014 while (remaining--) {
3015 portid++;
3016 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
3017 portid = TIPC_MIN_PORT;
3018 tsk->portid = portid;
3019 sock_hold(&tsk->sk);
3020 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3021 tsk_rht_params))
3022 return 0;
3023 sock_put(&tsk->sk);
3024 }
3025
3026 return -1;
3027}
3028
3029static void tipc_sk_remove(struct tipc_sock *tsk)
3030{
3031 struct sock *sk = &tsk->sk;
3032 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3033
3034 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3035 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3036 __sock_put(sk);
3037 }
3038}
3039
3040static const struct rhashtable_params tsk_rht_params = {
3041 .nelem_hint = 192,
3042 .head_offset = offsetof(struct tipc_sock, node),
3043 .key_offset = offsetof(struct tipc_sock, portid),
3044 .key_len = sizeof(u32), /* portid */
3045 .max_size = 1048576,
3046 .min_size = 256,
3047 .automatic_shrinking = true,
3048};
3049
3050int tipc_sk_rht_init(struct net *net)
3051{
3052 struct tipc_net *tn = net_generic(net, tipc_net_id);
3053
3054 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3055}
3056
3057void tipc_sk_rht_destroy(struct net *net)
3058{
3059 struct tipc_net *tn = net_generic(net, tipc_net_id);
3060
3061 /* Wait for socket readers to complete */
3062 synchronize_net();
3063
3064 rhashtable_destroy(&tn->sk_rht);
3065}
3066
3067static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3068{
3069 struct net *net = sock_net(&tsk->sk);
3070 struct tipc_group *grp = tsk->group;
3071 struct tipc_msg *hdr = &tsk->phdr;
3072 struct tipc_uaddr ua;
3073 int rc;
3074
3075 if (mreq->type < TIPC_RESERVED_TYPES)
3076 return -EACCES;
3077 if (mreq->scope > TIPC_NODE_SCOPE)
3078 return -EINVAL;
3079 if (mreq->scope != TIPC_NODE_SCOPE)
3080 mreq->scope = TIPC_CLUSTER_SCOPE;
3081 if (grp)
3082 return -EACCES;
3083 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3084 if (!grp)
3085 return -ENOMEM;
3086 tsk->group = grp;
3087 msg_set_lookup_scope(hdr, mreq->scope);
3088 msg_set_nametype(hdr, mreq->type);
3089 msg_set_dest_droppable(hdr, true);
3090 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3091 mreq->type, mreq->instance, mreq->instance);
3092 tipc_nametbl_build_group(net, grp, &ua);
3093 rc = tipc_sk_publish(tsk, &ua);
3094 if (rc) {
3095 tipc_group_delete(net, grp);
3096 tsk->group = NULL;
3097 return rc;
3098 }
3099 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3100 tsk->mc_method.rcast = true;
3101 tsk->mc_method.mandatory = true;
3102 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3103 return rc;
3104}
3105
3106static int tipc_sk_leave(struct tipc_sock *tsk)
3107{
3108 struct net *net = sock_net(&tsk->sk);
3109 struct tipc_group *grp = tsk->group;
3110 struct tipc_uaddr ua;
3111 int scope;
3112
3113 if (!grp)
3114 return -EINVAL;
3115 ua.addrtype = TIPC_SERVICE_RANGE;
3116 tipc_group_self(grp, &ua.sr, &scope);
3117 ua.scope = scope;
3118 tipc_group_delete(net, grp);
3119 tsk->group = NULL;
3120 tipc_sk_withdraw(tsk, &ua);
3121 return 0;
3122}
3123
3124/**
3125 * tipc_setsockopt - set socket option
3126 * @sock: socket structure
3127 * @lvl: option level
3128 * @opt: option identifier
3129 * @ov: pointer to new option value
3130 * @ol: length of option value
3131 *
3132 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3133 * (to ease compatibility).
3134 *
3135 * Return: 0 on success, errno otherwise
3136 */
3137static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3138 sockptr_t ov, unsigned int ol)
3139{
3140 struct sock *sk = sock->sk;
3141 struct tipc_sock *tsk = tipc_sk(sk);
3142 struct tipc_group_req mreq;
3143 u32 value = 0;
3144 int res = 0;
3145
3146 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3147 return 0;
3148 if (lvl != SOL_TIPC)
3149 return -ENOPROTOOPT;
3150
3151 switch (opt) {
3152 case TIPC_IMPORTANCE:
3153 case TIPC_SRC_DROPPABLE:
3154 case TIPC_DEST_DROPPABLE:
3155 case TIPC_CONN_TIMEOUT:
3156 case TIPC_NODELAY:
3157 if (ol < sizeof(value))
3158 return -EINVAL;
3159 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3160 return -EFAULT;
3161 break;
3162 case TIPC_GROUP_JOIN:
3163 if (ol < sizeof(mreq))
3164 return -EINVAL;
3165 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3166 return -EFAULT;
3167 break;
3168 default:
3169 if (!sockptr_is_null(ov) || ol)
3170 return -EINVAL;
3171 }
3172
3173 lock_sock(sk);
3174
3175 switch (opt) {
3176 case TIPC_IMPORTANCE:
3177 res = tsk_set_importance(sk, value);
3178 break;
3179 case TIPC_SRC_DROPPABLE:
3180 if (sock->type != SOCK_STREAM)
3181 tsk_set_unreliable(tsk, value);
3182 else
3183 res = -ENOPROTOOPT;
3184 break;
3185 case TIPC_DEST_DROPPABLE:
3186 tsk_set_unreturnable(tsk, value);
3187 break;
3188 case TIPC_CONN_TIMEOUT:
3189 tipc_sk(sk)->conn_timeout = value;
3190 break;
3191 case TIPC_MCAST_BROADCAST:
3192 tsk->mc_method.rcast = false;
3193 tsk->mc_method.mandatory = true;
3194 break;
3195 case TIPC_MCAST_REPLICAST:
3196 tsk->mc_method.rcast = true;
3197 tsk->mc_method.mandatory = true;
3198 break;
3199 case TIPC_GROUP_JOIN:
3200 res = tipc_sk_join(tsk, &mreq);
3201 break;
3202 case TIPC_GROUP_LEAVE:
3203 res = tipc_sk_leave(tsk);
3204 break;
3205 case TIPC_NODELAY:
3206 tsk->nodelay = !!value;
3207 tsk_set_nagle(tsk);
3208 break;
3209 default:
3210 res = -EINVAL;
3211 }
3212
3213 release_sock(sk);
3214
3215 return res;
3216}
3217
3218/**
3219 * tipc_getsockopt - get socket option
3220 * @sock: socket structure
3221 * @lvl: option level
3222 * @opt: option identifier
3223 * @ov: receptacle for option value
3224 * @ol: receptacle for length of option value
3225 *
3226 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3227 * (to ease compatibility).
3228 *
3229 * Return: 0 on success, errno otherwise
3230 */
3231static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3232 char __user *ov, int __user *ol)
3233{
3234 struct sock *sk = sock->sk;
3235 struct tipc_sock *tsk = tipc_sk(sk);
3236 struct tipc_service_range seq;
3237 int len, scope;
3238 u32 value;
3239 int res;
3240
3241 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3242 return put_user(0, ol);
3243 if (lvl != SOL_TIPC)
3244 return -ENOPROTOOPT;
3245 res = get_user(len, ol);
3246 if (res)
3247 return res;
3248
3249 lock_sock(sk);
3250
3251 switch (opt) {
3252 case TIPC_IMPORTANCE:
3253 value = tsk_importance(tsk);
3254 break;
3255 case TIPC_SRC_DROPPABLE:
3256 value = tsk_unreliable(tsk);
3257 break;
3258 case TIPC_DEST_DROPPABLE:
3259 value = tsk_unreturnable(tsk);
3260 break;
3261 case TIPC_CONN_TIMEOUT:
3262 value = tsk->conn_timeout;
3263 /* no need to set "res", since already 0 at this point */
3264 break;
3265 case TIPC_NODE_RECVQ_DEPTH:
3266 value = 0; /* was tipc_queue_size, now obsolete */
3267 break;
3268 case TIPC_SOCK_RECVQ_DEPTH:
3269 value = skb_queue_len(&sk->sk_receive_queue);
3270 break;
3271 case TIPC_SOCK_RECVQ_USED:
3272 value = sk_rmem_alloc_get(sk);
3273 break;
3274 case TIPC_GROUP_JOIN:
3275 seq.type = 0;
3276 if (tsk->group)
3277 tipc_group_self(tsk->group, &seq, &scope);
3278 value = seq.type;
3279 break;
3280 default:
3281 res = -EINVAL;
3282 }
3283
3284 release_sock(sk);
3285
3286 if (res)
3287 return res; /* "get" failed */
3288
3289 if (len < sizeof(value))
3290 return -EINVAL;
3291
3292 if (copy_to_user(ov, &value, sizeof(value)))
3293 return -EFAULT;
3294
3295 return put_user(sizeof(value), ol);
3296}
3297
3298static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3299{
3300 struct net *net = sock_net(sock->sk);
3301 struct tipc_sioc_nodeid_req nr = {0};
3302 struct tipc_sioc_ln_req lnr;
3303 void __user *argp = (void __user *)arg;
3304
3305 switch (cmd) {
3306 case SIOCGETLINKNAME:
3307 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3308 return -EFAULT;
3309 if (!tipc_node_get_linkname(net,
3310 lnr.bearer_id & 0xffff, lnr.peer,
3311 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3312 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3313 return -EFAULT;
3314 return 0;
3315 }
3316 return -EADDRNOTAVAIL;
3317 case SIOCGETNODEID:
3318 if (copy_from_user(&nr, argp, sizeof(nr)))
3319 return -EFAULT;
3320 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3321 return -EADDRNOTAVAIL;
3322 if (copy_to_user(argp, &nr, sizeof(nr)))
3323 return -EFAULT;
3324 return 0;
3325 default:
3326 return -ENOIOCTLCMD;
3327 }
3328}
3329
3330static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3331{
3332 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3333 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3334 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3335
3336 tsk1->peer.family = AF_TIPC;
3337 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3338 tsk1->peer.scope = TIPC_NODE_SCOPE;
3339 tsk1->peer.addr.id.ref = tsk2->portid;
3340 tsk1->peer.addr.id.node = onode;
3341 tsk2->peer.family = AF_TIPC;
3342 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3343 tsk2->peer.scope = TIPC_NODE_SCOPE;
3344 tsk2->peer.addr.id.ref = tsk1->portid;
3345 tsk2->peer.addr.id.node = onode;
3346
3347 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3348 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3349 return 0;
3350}
3351
3352/* Protocol switches for the various types of TIPC sockets */
3353
3354static const struct proto_ops msg_ops = {
3355 .owner = THIS_MODULE,
3356 .family = AF_TIPC,
3357 .release = tipc_release,
3358 .bind = tipc_bind,
3359 .connect = tipc_connect,
3360 .socketpair = tipc_socketpair,
3361 .accept = sock_no_accept,
3362 .getname = tipc_getname,
3363 .poll = tipc_poll,
3364 .ioctl = tipc_ioctl,
3365 .listen = sock_no_listen,
3366 .shutdown = tipc_shutdown,
3367 .setsockopt = tipc_setsockopt,
3368 .getsockopt = tipc_getsockopt,
3369 .sendmsg = tipc_sendmsg,
3370 .recvmsg = tipc_recvmsg,
3371 .mmap = sock_no_mmap,
3372};
3373
3374static const struct proto_ops packet_ops = {
3375 .owner = THIS_MODULE,
3376 .family = AF_TIPC,
3377 .release = tipc_release,
3378 .bind = tipc_bind,
3379 .connect = tipc_connect,
3380 .socketpair = tipc_socketpair,
3381 .accept = tipc_accept,
3382 .getname = tipc_getname,
3383 .poll = tipc_poll,
3384 .ioctl = tipc_ioctl,
3385 .listen = tipc_listen,
3386 .shutdown = tipc_shutdown,
3387 .setsockopt = tipc_setsockopt,
3388 .getsockopt = tipc_getsockopt,
3389 .sendmsg = tipc_send_packet,
3390 .recvmsg = tipc_recvmsg,
3391 .mmap = sock_no_mmap,
3392};
3393
3394static const struct proto_ops stream_ops = {
3395 .owner = THIS_MODULE,
3396 .family = AF_TIPC,
3397 .release = tipc_release,
3398 .bind = tipc_bind,
3399 .connect = tipc_connect,
3400 .socketpair = tipc_socketpair,
3401 .accept = tipc_accept,
3402 .getname = tipc_getname,
3403 .poll = tipc_poll,
3404 .ioctl = tipc_ioctl,
3405 .listen = tipc_listen,
3406 .shutdown = tipc_shutdown,
3407 .setsockopt = tipc_setsockopt,
3408 .getsockopt = tipc_getsockopt,
3409 .sendmsg = tipc_sendstream,
3410 .recvmsg = tipc_recvstream,
3411 .mmap = sock_no_mmap,
3412};
3413
3414static const struct net_proto_family tipc_family_ops = {
3415 .owner = THIS_MODULE,
3416 .family = AF_TIPC,
3417 .create = tipc_sk_create
3418};
3419
3420static struct proto tipc_proto = {
3421 .name = "TIPC",
3422 .owner = THIS_MODULE,
3423 .obj_size = sizeof(struct tipc_sock),
3424 .sysctl_rmem = sysctl_tipc_rmem
3425};
3426
3427/**
3428 * tipc_socket_init - initialize TIPC socket interface
3429 *
3430 * Return: 0 on success, errno otherwise
3431 */
3432int tipc_socket_init(void)
3433{
3434 int res;
3435
3436 res = proto_register(&tipc_proto, 1);
3437 if (res) {
3438 pr_err("Failed to register TIPC protocol type\n");
3439 goto out;
3440 }
3441
3442 res = sock_register(&tipc_family_ops);
3443 if (res) {
3444 pr_err("Failed to register TIPC socket type\n");
3445 proto_unregister(&tipc_proto);
3446 goto out;
3447 }
3448 out:
3449 return res;
3450}
3451
3452/**
3453 * tipc_socket_stop - stop TIPC socket interface
3454 */
3455void tipc_socket_stop(void)
3456{
3457 sock_unregister(tipc_family_ops.family);
3458 proto_unregister(&tipc_proto);
3459}
3460
3461/* Caller should hold socket lock for the passed tipc socket. */
3462static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3463{
3464 u32 peer_node, peer_port;
3465 u32 conn_type, conn_instance;
3466 struct nlattr *nest;
3467
3468 peer_node = tsk_peer_node(tsk);
3469 peer_port = tsk_peer_port(tsk);
3470 conn_type = msg_nametype(&tsk->phdr);
3471 conn_instance = msg_nameinst(&tsk->phdr);
3472 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3473 if (!nest)
3474 return -EMSGSIZE;
3475
3476 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3477 goto msg_full;
3478 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3479 goto msg_full;
3480
3481 if (tsk->conn_addrtype != 0) {
3482 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3483 goto msg_full;
3484 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3485 goto msg_full;
3486 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3487 goto msg_full;
3488 }
3489 nla_nest_end(skb, nest);
3490
3491 return 0;
3492
3493msg_full:
3494 nla_nest_cancel(skb, nest);
3495
3496 return -EMSGSIZE;
3497}
3498
3499static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3500 *tsk)
3501{
3502 struct net *net = sock_net(skb->sk);
3503 struct sock *sk = &tsk->sk;
3504
3505 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3506 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3507 return -EMSGSIZE;
3508
3509 if (tipc_sk_connected(sk)) {
3510 if (__tipc_nl_add_sk_con(skb, tsk))
3511 return -EMSGSIZE;
3512 } else if (!list_empty(&tsk->publications)) {
3513 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3514 return -EMSGSIZE;
3515 }
3516 return 0;
3517}
3518
3519/* Caller should hold socket lock for the passed tipc socket. */
3520static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3521 struct tipc_sock *tsk)
3522{
3523 struct nlattr *attrs;
3524 void *hdr;
3525
3526 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3527 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3528 if (!hdr)
3529 goto msg_cancel;
3530
3531 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3532 if (!attrs)
3533 goto genlmsg_cancel;
3534
3535 if (__tipc_nl_add_sk_info(skb, tsk))
3536 goto attr_msg_cancel;
3537
3538 nla_nest_end(skb, attrs);
3539 genlmsg_end(skb, hdr);
3540
3541 return 0;
3542
3543attr_msg_cancel:
3544 nla_nest_cancel(skb, attrs);
3545genlmsg_cancel:
3546 genlmsg_cancel(skb, hdr);
3547msg_cancel:
3548 return -EMSGSIZE;
3549}
3550
3551int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3552 int (*skb_handler)(struct sk_buff *skb,
3553 struct netlink_callback *cb,
3554 struct tipc_sock *tsk))
3555{
3556 struct rhashtable_iter *iter = (void *)cb->args[4];
3557 struct tipc_sock *tsk;
3558 int err;
3559
3560 rhashtable_walk_start(iter);
3561 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3562 if (IS_ERR(tsk)) {
3563 if (PTR_ERR(tsk) == -EAGAIN)
3564 continue;
3565 break;
3566 }
3567
3568 sock_hold(&tsk->sk);
3569 rhashtable_walk_stop(iter);
3570 lock_sock(&tsk->sk);
3571 err = skb_handler(skb, cb, tsk);
3572 if (err) {
3573 release_sock(&tsk->sk);
3574 sock_put(&tsk->sk);
3575 goto out;
3576 }
3577 release_sock(&tsk->sk);
3578 rhashtable_walk_start(iter);
3579 sock_put(&tsk->sk);
3580 }
3581 rhashtable_walk_stop(iter);
3582out:
3583 return skb->len;
3584}
3585EXPORT_SYMBOL(tipc_nl_sk_walk);
3586
3587int tipc_dump_start(struct netlink_callback *cb)
3588{
3589 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3590}
3591EXPORT_SYMBOL(tipc_dump_start);
3592
3593int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3594{
3595 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3596 struct rhashtable_iter *iter = (void *)cb->args[4];
3597 struct tipc_net *tn = tipc_net(net);
3598
3599 if (!iter) {
3600 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3601 if (!iter)
3602 return -ENOMEM;
3603
3604 cb->args[4] = (long)iter;
3605 }
3606
3607 rhashtable_walk_enter(&tn->sk_rht, iter);
3608 return 0;
3609}
3610
3611int tipc_dump_done(struct netlink_callback *cb)
3612{
3613 struct rhashtable_iter *hti = (void *)cb->args[4];
3614
3615 rhashtable_walk_exit(hti);
3616 kfree(hti);
3617 return 0;
3618}
3619EXPORT_SYMBOL(tipc_dump_done);
3620
3621int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3622 struct tipc_sock *tsk, u32 sk_filter_state,
3623 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3624{
3625 struct sock *sk = &tsk->sk;
3626 struct nlattr *attrs;
3627 struct nlattr *stat;
3628
3629 /*filter response w.r.t sk_state*/
3630 if (!(sk_filter_state & (1 << sk->sk_state)))
3631 return 0;
3632
3633 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3634 if (!attrs)
3635 goto msg_cancel;
3636
3637 if (__tipc_nl_add_sk_info(skb, tsk))
3638 goto attr_msg_cancel;
3639
3640 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3641 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3642 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3643 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3644 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3645 sock_i_uid(sk))) ||
3646 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3647 tipc_diag_gen_cookie(sk),
3648 TIPC_NLA_SOCK_PAD))
3649 goto attr_msg_cancel;
3650
3651 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3652 if (!stat)
3653 goto attr_msg_cancel;
3654
3655 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3656 skb_queue_len(&sk->sk_receive_queue)) ||
3657 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3658 skb_queue_len(&sk->sk_write_queue)) ||
3659 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3660 atomic_read(&sk->sk_drops)))
3661 goto stat_msg_cancel;
3662
3663 if (tsk->cong_link_cnt &&
3664 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3665 goto stat_msg_cancel;
3666
3667 if (tsk_conn_cong(tsk) &&
3668 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3669 goto stat_msg_cancel;
3670
3671 nla_nest_end(skb, stat);
3672
3673 if (tsk->group)
3674 if (tipc_group_fill_sock_diag(tsk->group, skb))
3675 goto stat_msg_cancel;
3676
3677 nla_nest_end(skb, attrs);
3678
3679 return 0;
3680
3681stat_msg_cancel:
3682 nla_nest_cancel(skb, stat);
3683attr_msg_cancel:
3684 nla_nest_cancel(skb, attrs);
3685msg_cancel:
3686 return -EMSGSIZE;
3687}
3688EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3689
3690int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3691{
3692 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3693}
3694
3695/* Caller should hold socket lock for the passed tipc socket. */
3696static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3697 struct netlink_callback *cb,
3698 struct publication *publ)
3699{
3700 void *hdr;
3701 struct nlattr *attrs;
3702
3703 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3704 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3705 if (!hdr)
3706 goto msg_cancel;
3707
3708 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3709 if (!attrs)
3710 goto genlmsg_cancel;
3711
3712 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3713 goto attr_msg_cancel;
3714 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3715 goto attr_msg_cancel;
3716 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3717 goto attr_msg_cancel;
3718 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3719 goto attr_msg_cancel;
3720
3721 nla_nest_end(skb, attrs);
3722 genlmsg_end(skb, hdr);
3723
3724 return 0;
3725
3726attr_msg_cancel:
3727 nla_nest_cancel(skb, attrs);
3728genlmsg_cancel:
3729 genlmsg_cancel(skb, hdr);
3730msg_cancel:
3731 return -EMSGSIZE;
3732}
3733
3734/* Caller should hold socket lock for the passed tipc socket. */
3735static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3736 struct netlink_callback *cb,
3737 struct tipc_sock *tsk, u32 *last_publ)
3738{
3739 int err;
3740 struct publication *p;
3741
3742 if (*last_publ) {
3743 list_for_each_entry(p, &tsk->publications, binding_sock) {
3744 if (p->key == *last_publ)
3745 break;
3746 }
3747 if (list_entry_is_head(p, &tsk->publications, binding_sock)) {
3748 /* We never set seq or call nl_dump_check_consistent()
3749 * this means that setting prev_seq here will cause the
3750 * consistence check to fail in the netlink callback
3751 * handler. Resulting in the last NLMSG_DONE message
3752 * having the NLM_F_DUMP_INTR flag set.
3753 */
3754 cb->prev_seq = 1;
3755 *last_publ = 0;
3756 return -EPIPE;
3757 }
3758 } else {
3759 p = list_first_entry(&tsk->publications, struct publication,
3760 binding_sock);
3761 }
3762
3763 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3764 err = __tipc_nl_add_sk_publ(skb, cb, p);
3765 if (err) {
3766 *last_publ = p->key;
3767 return err;
3768 }
3769 }
3770 *last_publ = 0;
3771
3772 return 0;
3773}
3774
3775int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3776{
3777 int err;
3778 u32 tsk_portid = cb->args[0];
3779 u32 last_publ = cb->args[1];
3780 u32 done = cb->args[2];
3781 struct net *net = sock_net(skb->sk);
3782 struct tipc_sock *tsk;
3783
3784 if (!tsk_portid) {
3785 struct nlattr **attrs = genl_dumpit_info(cb)->info.attrs;
3786 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3787
3788 if (!attrs[TIPC_NLA_SOCK])
3789 return -EINVAL;
3790
3791 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3792 attrs[TIPC_NLA_SOCK],
3793 tipc_nl_sock_policy, NULL);
3794 if (err)
3795 return err;
3796
3797 if (!sock[TIPC_NLA_SOCK_REF])
3798 return -EINVAL;
3799
3800 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3801 }
3802
3803 if (done)
3804 return 0;
3805
3806 tsk = tipc_sk_lookup(net, tsk_portid);
3807 if (!tsk)
3808 return -EINVAL;
3809
3810 lock_sock(&tsk->sk);
3811 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3812 if (!err)
3813 done = 1;
3814 release_sock(&tsk->sk);
3815 sock_put(&tsk->sk);
3816
3817 cb->args[0] = tsk_portid;
3818 cb->args[1] = last_publ;
3819 cb->args[2] = done;
3820
3821 return skb->len;
3822}
3823
3824/**
3825 * tipc_sk_filtering - check if a socket should be traced
3826 * @sk: the socket to be examined
3827 *
3828 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3829 * (portid, sock type, name type, name lower, name upper)
3830 *
3831 * Return: true if the socket meets the socket tuple data
3832 * (value 0 = 'any') or when there is no tuple set (all = 0),
3833 * otherwise false
3834 */
3835bool tipc_sk_filtering(struct sock *sk)
3836{
3837 struct tipc_sock *tsk;
3838 struct publication *p;
3839 u32 _port, _sktype, _type, _lower, _upper;
3840 u32 type = 0, lower = 0, upper = 0;
3841
3842 if (!sk)
3843 return true;
3844
3845 tsk = tipc_sk(sk);
3846
3847 _port = sysctl_tipc_sk_filter[0];
3848 _sktype = sysctl_tipc_sk_filter[1];
3849 _type = sysctl_tipc_sk_filter[2];
3850 _lower = sysctl_tipc_sk_filter[3];
3851 _upper = sysctl_tipc_sk_filter[4];
3852
3853 if (!_port && !_sktype && !_type && !_lower && !_upper)
3854 return true;
3855
3856 if (_port)
3857 return (_port == tsk->portid);
3858
3859 if (_sktype && _sktype != sk->sk_type)
3860 return false;
3861
3862 if (tsk->published) {
3863 p = list_first_entry_or_null(&tsk->publications,
3864 struct publication, binding_sock);
3865 if (p) {
3866 type = p->sr.type;
3867 lower = p->sr.lower;
3868 upper = p->sr.upper;
3869 }
3870 }
3871
3872 if (!tipc_sk_type_connectionless(sk)) {
3873 type = msg_nametype(&tsk->phdr);
3874 lower = msg_nameinst(&tsk->phdr);
3875 upper = lower;
3876 }
3877
3878 if ((_type && _type != type) || (_lower && _lower != lower) ||
3879 (_upper && _upper != upper))
3880 return false;
3881
3882 return true;
3883}
3884
3885u32 tipc_sock_get_portid(struct sock *sk)
3886{
3887 return (sk) ? (tipc_sk(sk))->portid : 0;
3888}
3889
3890/**
3891 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3892 * both the rcv and backlog queues are considered
3893 * @sk: tipc sk to be checked
3894 * @skb: tipc msg to be checked
3895 *
3896 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3897 */
3898
3899bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3900{
3901 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3902 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3903 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3904
3905 return (qsize > lim * 90 / 100);
3906}
3907
3908/**
3909 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3910 * only the rcv queue is considered
3911 * @sk: tipc sk to be checked
3912 * @skb: tipc msg to be checked
3913 *
3914 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3915 */
3916
3917bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3918{
3919 unsigned int lim = rcvbuf_limit(sk, skb);
3920 unsigned int qsize = sk_rmem_alloc_get(sk);
3921
3922 return (qsize > lim * 90 / 100);
3923}
3924
3925/**
3926 * tipc_sk_dump - dump TIPC socket
3927 * @sk: tipc sk to be dumped
3928 * @dqueues: bitmask to decide if any socket queue to be dumped?
3929 * - TIPC_DUMP_NONE: don't dump socket queues
3930 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3931 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3932 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3933 * - TIPC_DUMP_ALL: dump all the socket queues above
3934 * @buf: returned buffer of dump data in format
3935 */
3936int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3937{
3938 int i = 0;
3939 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3940 u32 conn_type, conn_instance;
3941 struct tipc_sock *tsk;
3942 struct publication *p;
3943 bool tsk_connected;
3944
3945 if (!sk) {
3946 i += scnprintf(buf, sz, "sk data: (null)\n");
3947 return i;
3948 }
3949
3950 tsk = tipc_sk(sk);
3951 tsk_connected = !tipc_sk_type_connectionless(sk);
3952
3953 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3954 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3955 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3956 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3957 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3958 if (tsk_connected) {
3959 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3960 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3961 conn_type = msg_nametype(&tsk->phdr);
3962 conn_instance = msg_nameinst(&tsk->phdr);
3963 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3964 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3965 }
3966 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3967 if (tsk->published) {
3968 p = list_first_entry_or_null(&tsk->publications,
3969 struct publication, binding_sock);
3970 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3971 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3972 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3973 }
3974 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3975 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3976 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3977 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3978 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3979 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3980 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3981 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3982 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3983 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3984 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3985 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3986 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3987 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3988
3989 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3990 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3991 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3992 }
3993
3994 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3995 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3996 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
3997 }
3998
3999 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
4000 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
4001 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
4002 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
4003 i += scnprintf(buf + i, sz - i, " tail ");
4004 i += tipc_skb_dump(sk->sk_backlog.tail, false,
4005 buf + i);
4006 }
4007 }
4008
4009 return i;
4010}
1/*
2 * net/tipc/socket.c: TIPC socket API
3 *
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <linux/export.h>
38#include <net/sock.h>
39
40#include "core.h"
41#include "port.h"
42
43#define SS_LISTENING -1 /* socket is listening */
44#define SS_READY -2 /* socket is connectionless */
45
46#define OVERLOAD_LIMIT_BASE 5000
47#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
48
49struct tipc_sock {
50 struct sock sk;
51 struct tipc_port *p;
52 struct tipc_portid peer_name;
53 unsigned int conn_timeout;
54};
55
56#define tipc_sk(sk) ((struct tipc_sock *)(sk))
57#define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p))
58
59#define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
60 (sock->state == SS_DISCONNECTING))
61
62static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
63static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
64static void wakeupdispatch(struct tipc_port *tport);
65
66static const struct proto_ops packet_ops;
67static const struct proto_ops stream_ops;
68static const struct proto_ops msg_ops;
69
70static struct proto tipc_proto;
71
72static int sockets_enabled;
73
74static atomic_t tipc_queue_size = ATOMIC_INIT(0);
75
76/*
77 * Revised TIPC socket locking policy:
78 *
79 * Most socket operations take the standard socket lock when they start
80 * and hold it until they finish (or until they need to sleep). Acquiring
81 * this lock grants the owner exclusive access to the fields of the socket
82 * data structures, with the exception of the backlog queue. A few socket
83 * operations can be done without taking the socket lock because they only
84 * read socket information that never changes during the life of the socket.
85 *
86 * Socket operations may acquire the lock for the associated TIPC port if they
87 * need to perform an operation on the port. If any routine needs to acquire
88 * both the socket lock and the port lock it must take the socket lock first
89 * to avoid the risk of deadlock.
90 *
91 * The dispatcher handling incoming messages cannot grab the socket lock in
92 * the standard fashion, since invoked it runs at the BH level and cannot block.
93 * Instead, it checks to see if the socket lock is currently owned by someone,
94 * and either handles the message itself or adds it to the socket's backlog
95 * queue; in the latter case the queued message is processed once the process
96 * owning the socket lock releases it.
97 *
98 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
99 * the problem of a blocked socket operation preventing any other operations
100 * from occurring. However, applications must be careful if they have
101 * multiple threads trying to send (or receive) on the same socket, as these
102 * operations might interfere with each other. For example, doing a connect
103 * and a receive at the same time might allow the receive to consume the
104 * ACK message meant for the connect. While additional work could be done
105 * to try and overcome this, it doesn't seem to be worthwhile at the present.
106 *
107 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
108 * that another operation that must be performed in a non-blocking manner is
109 * not delayed for very long because the lock has already been taken.
110 *
111 * NOTE: This code assumes that certain fields of a port/socket pair are
112 * constant over its lifetime; such fields can be examined without taking
113 * the socket lock and/or port lock, and do not need to be re-read even
114 * after resuming processing after waiting. These fields include:
115 * - socket type
116 * - pointer to socket sk structure (aka tipc_sock structure)
117 * - pointer to port structure
118 * - port reference
119 */
120
121/**
122 * advance_rx_queue - discard first buffer in socket receive queue
123 *
124 * Caller must hold socket lock
125 */
126static void advance_rx_queue(struct sock *sk)
127{
128 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
129 atomic_dec(&tipc_queue_size);
130}
131
132/**
133 * discard_rx_queue - discard all buffers in socket receive queue
134 *
135 * Caller must hold socket lock
136 */
137static void discard_rx_queue(struct sock *sk)
138{
139 struct sk_buff *buf;
140
141 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
142 atomic_dec(&tipc_queue_size);
143 kfree_skb(buf);
144 }
145}
146
147/**
148 * reject_rx_queue - reject all buffers in socket receive queue
149 *
150 * Caller must hold socket lock
151 */
152static void reject_rx_queue(struct sock *sk)
153{
154 struct sk_buff *buf;
155
156 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
157 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
158 atomic_dec(&tipc_queue_size);
159 }
160}
161
162/**
163 * tipc_create - create a TIPC socket
164 * @net: network namespace (must be default network)
165 * @sock: pre-allocated socket structure
166 * @protocol: protocol indicator (must be 0)
167 * @kern: caused by kernel or by userspace?
168 *
169 * This routine creates additional data structures used by the TIPC socket,
170 * initializes them, and links them together.
171 *
172 * Returns 0 on success, errno otherwise
173 */
174static int tipc_create(struct net *net, struct socket *sock, int protocol,
175 int kern)
176{
177 const struct proto_ops *ops;
178 socket_state state;
179 struct sock *sk;
180 struct tipc_port *tp_ptr;
181
182 /* Validate arguments */
183 if (unlikely(protocol != 0))
184 return -EPROTONOSUPPORT;
185
186 switch (sock->type) {
187 case SOCK_STREAM:
188 ops = &stream_ops;
189 state = SS_UNCONNECTED;
190 break;
191 case SOCK_SEQPACKET:
192 ops = &packet_ops;
193 state = SS_UNCONNECTED;
194 break;
195 case SOCK_DGRAM:
196 case SOCK_RDM:
197 ops = &msg_ops;
198 state = SS_READY;
199 break;
200 default:
201 return -EPROTOTYPE;
202 }
203
204 /* Allocate socket's protocol area */
205 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
206 if (sk == NULL)
207 return -ENOMEM;
208
209 /* Allocate TIPC port for socket to use */
210 tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
211 TIPC_LOW_IMPORTANCE);
212 if (unlikely(!tp_ptr)) {
213 sk_free(sk);
214 return -ENOMEM;
215 }
216
217 /* Finish initializing socket data structures */
218 sock->ops = ops;
219 sock->state = state;
220
221 sock_init_data(sock, sk);
222 sk->sk_backlog_rcv = backlog_rcv;
223 tipc_sk(sk)->p = tp_ptr;
224 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
225
226 spin_unlock_bh(tp_ptr->lock);
227
228 if (sock->state == SS_READY) {
229 tipc_set_portunreturnable(tp_ptr->ref, 1);
230 if (sock->type == SOCK_DGRAM)
231 tipc_set_portunreliable(tp_ptr->ref, 1);
232 }
233
234 return 0;
235}
236
237/**
238 * release - destroy a TIPC socket
239 * @sock: socket to destroy
240 *
241 * This routine cleans up any messages that are still queued on the socket.
242 * For DGRAM and RDM socket types, all queued messages are rejected.
243 * For SEQPACKET and STREAM socket types, the first message is rejected
244 * and any others are discarded. (If the first message on a STREAM socket
245 * is partially-read, it is discarded and the next one is rejected instead.)
246 *
247 * NOTE: Rejected messages are not necessarily returned to the sender! They
248 * are returned or discarded according to the "destination droppable" setting
249 * specified for the message by the sender.
250 *
251 * Returns 0 on success, errno otherwise
252 */
253static int release(struct socket *sock)
254{
255 struct sock *sk = sock->sk;
256 struct tipc_port *tport;
257 struct sk_buff *buf;
258 int res;
259
260 /*
261 * Exit if socket isn't fully initialized (occurs when a failed accept()
262 * releases a pre-allocated child socket that was never used)
263 */
264 if (sk == NULL)
265 return 0;
266
267 tport = tipc_sk_port(sk);
268 lock_sock(sk);
269
270 /*
271 * Reject all unreceived messages, except on an active connection
272 * (which disconnects locally & sends a 'FIN+' to peer)
273 */
274 while (sock->state != SS_DISCONNECTING) {
275 buf = __skb_dequeue(&sk->sk_receive_queue);
276 if (buf == NULL)
277 break;
278 atomic_dec(&tipc_queue_size);
279 if (TIPC_SKB_CB(buf)->handle != 0)
280 kfree_skb(buf);
281 else {
282 if ((sock->state == SS_CONNECTING) ||
283 (sock->state == SS_CONNECTED)) {
284 sock->state = SS_DISCONNECTING;
285 tipc_disconnect(tport->ref);
286 }
287 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
288 }
289 }
290
291 /*
292 * Delete TIPC port; this ensures no more messages are queued
293 * (also disconnects an active connection & sends a 'FIN-' to peer)
294 */
295 res = tipc_deleteport(tport->ref);
296
297 /* Discard any remaining (connection-based) messages in receive queue */
298 discard_rx_queue(sk);
299
300 /* Reject any messages that accumulated in backlog queue */
301 sock->state = SS_DISCONNECTING;
302 release_sock(sk);
303
304 sock_put(sk);
305 sock->sk = NULL;
306
307 return res;
308}
309
310/**
311 * bind - associate or disassocate TIPC name(s) with a socket
312 * @sock: socket structure
313 * @uaddr: socket address describing name(s) and desired operation
314 * @uaddr_len: size of socket address data structure
315 *
316 * Name and name sequence binding is indicated using a positive scope value;
317 * a negative scope value unbinds the specified name. Specifying no name
318 * (i.e. a socket address length of 0) unbinds all names from the socket.
319 *
320 * Returns 0 on success, errno otherwise
321 *
322 * NOTE: This routine doesn't need to take the socket lock since it doesn't
323 * access any non-constant socket information.
324 */
325static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
326{
327 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
328 u32 portref = tipc_sk_port(sock->sk)->ref;
329
330 if (unlikely(!uaddr_len))
331 return tipc_withdraw(portref, 0, NULL);
332
333 if (uaddr_len < sizeof(struct sockaddr_tipc))
334 return -EINVAL;
335 if (addr->family != AF_TIPC)
336 return -EAFNOSUPPORT;
337
338 if (addr->addrtype == TIPC_ADDR_NAME)
339 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
340 else if (addr->addrtype != TIPC_ADDR_NAMESEQ)
341 return -EAFNOSUPPORT;
342
343 if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES)
344 return -EACCES;
345
346 return (addr->scope > 0) ?
347 tipc_publish(portref, addr->scope, &addr->addr.nameseq) :
348 tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq);
349}
350
351/**
352 * get_name - get port ID of socket or peer socket
353 * @sock: socket structure
354 * @uaddr: area for returned socket address
355 * @uaddr_len: area for returned length of socket address
356 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
357 *
358 * Returns 0 on success, errno otherwise
359 *
360 * NOTE: This routine doesn't need to take the socket lock since it only
361 * accesses socket information that is unchanging (or which changes in
362 * a completely predictable manner).
363 */
364static int get_name(struct socket *sock, struct sockaddr *uaddr,
365 int *uaddr_len, int peer)
366{
367 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
368 struct tipc_sock *tsock = tipc_sk(sock->sk);
369
370 memset(addr, 0, sizeof(*addr));
371 if (peer) {
372 if ((sock->state != SS_CONNECTED) &&
373 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
374 return -ENOTCONN;
375 addr->addr.id.ref = tsock->peer_name.ref;
376 addr->addr.id.node = tsock->peer_name.node;
377 } else {
378 addr->addr.id.ref = tsock->p->ref;
379 addr->addr.id.node = tipc_own_addr;
380 }
381
382 *uaddr_len = sizeof(*addr);
383 addr->addrtype = TIPC_ADDR_ID;
384 addr->family = AF_TIPC;
385 addr->scope = 0;
386 addr->addr.name.domain = 0;
387
388 return 0;
389}
390
391/**
392 * poll - read and possibly block on pollmask
393 * @file: file structure associated with the socket
394 * @sock: socket for which to calculate the poll bits
395 * @wait: ???
396 *
397 * Returns pollmask value
398 *
399 * COMMENTARY:
400 * It appears that the usual socket locking mechanisms are not useful here
401 * since the pollmask info is potentially out-of-date the moment this routine
402 * exits. TCP and other protocols seem to rely on higher level poll routines
403 * to handle any preventable race conditions, so TIPC will do the same ...
404 *
405 * TIPC sets the returned events as follows:
406 *
407 * socket state flags set
408 * ------------ ---------
409 * unconnected no read flags
410 * no write flags
411 *
412 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
413 * no write flags
414 *
415 * connected POLLIN/POLLRDNORM if data in rx queue
416 * POLLOUT if port is not congested
417 *
418 * disconnecting POLLIN/POLLRDNORM/POLLHUP
419 * no write flags
420 *
421 * listening POLLIN if SYN in rx queue
422 * no write flags
423 *
424 * ready POLLIN/POLLRDNORM if data in rx queue
425 * [connectionless] POLLOUT (since port cannot be congested)
426 *
427 * IMPORTANT: The fact that a read or write operation is indicated does NOT
428 * imply that the operation will succeed, merely that it should be performed
429 * and will not block.
430 */
431static unsigned int poll(struct file *file, struct socket *sock,
432 poll_table *wait)
433{
434 struct sock *sk = sock->sk;
435 u32 mask = 0;
436
437 poll_wait(file, sk_sleep(sk), wait);
438
439 switch ((int)sock->state) {
440 case SS_READY:
441 case SS_CONNECTED:
442 if (!tipc_sk_port(sk)->congested)
443 mask |= POLLOUT;
444 /* fall thru' */
445 case SS_CONNECTING:
446 case SS_LISTENING:
447 if (!skb_queue_empty(&sk->sk_receive_queue))
448 mask |= (POLLIN | POLLRDNORM);
449 break;
450 case SS_DISCONNECTING:
451 mask = (POLLIN | POLLRDNORM | POLLHUP);
452 break;
453 }
454
455 return mask;
456}
457
458/**
459 * dest_name_check - verify user is permitted to send to specified port name
460 * @dest: destination address
461 * @m: descriptor for message to be sent
462 *
463 * Prevents restricted configuration commands from being issued by
464 * unauthorized users.
465 *
466 * Returns 0 if permission is granted, otherwise errno
467 */
468static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
469{
470 struct tipc_cfg_msg_hdr hdr;
471
472 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
473 return 0;
474 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
475 return 0;
476 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
477 return -EACCES;
478
479 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
480 return -EMSGSIZE;
481 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
482 return -EFAULT;
483 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
484 return -EACCES;
485
486 return 0;
487}
488
489/**
490 * send_msg - send message in connectionless manner
491 * @iocb: if NULL, indicates that socket lock is already held
492 * @sock: socket structure
493 * @m: message to send
494 * @total_len: length of message
495 *
496 * Message must have an destination specified explicitly.
497 * Used for SOCK_RDM and SOCK_DGRAM messages,
498 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
499 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
500 *
501 * Returns the number of bytes sent on success, or errno otherwise
502 */
503static int send_msg(struct kiocb *iocb, struct socket *sock,
504 struct msghdr *m, size_t total_len)
505{
506 struct sock *sk = sock->sk;
507 struct tipc_port *tport = tipc_sk_port(sk);
508 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
509 int needs_conn;
510 long timeout_val;
511 int res = -EINVAL;
512
513 if (unlikely(!dest))
514 return -EDESTADDRREQ;
515 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
516 (dest->family != AF_TIPC)))
517 return -EINVAL;
518 if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
519 (m->msg_iovlen > (unsigned int)INT_MAX))
520 return -EMSGSIZE;
521
522 if (iocb)
523 lock_sock(sk);
524
525 needs_conn = (sock->state != SS_READY);
526 if (unlikely(needs_conn)) {
527 if (sock->state == SS_LISTENING) {
528 res = -EPIPE;
529 goto exit;
530 }
531 if (sock->state != SS_UNCONNECTED) {
532 res = -EISCONN;
533 goto exit;
534 }
535 if ((tport->published) ||
536 ((sock->type == SOCK_STREAM) && (total_len != 0))) {
537 res = -EOPNOTSUPP;
538 goto exit;
539 }
540 if (dest->addrtype == TIPC_ADDR_NAME) {
541 tport->conn_type = dest->addr.name.name.type;
542 tport->conn_instance = dest->addr.name.name.instance;
543 }
544
545 /* Abort any pending connection attempts (very unlikely) */
546 reject_rx_queue(sk);
547 }
548
549 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
550
551 do {
552 if (dest->addrtype == TIPC_ADDR_NAME) {
553 res = dest_name_check(dest, m);
554 if (res)
555 break;
556 res = tipc_send2name(tport->ref,
557 &dest->addr.name.name,
558 dest->addr.name.domain,
559 m->msg_iovlen,
560 m->msg_iov,
561 total_len);
562 } else if (dest->addrtype == TIPC_ADDR_ID) {
563 res = tipc_send2port(tport->ref,
564 &dest->addr.id,
565 m->msg_iovlen,
566 m->msg_iov,
567 total_len);
568 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
569 if (needs_conn) {
570 res = -EOPNOTSUPP;
571 break;
572 }
573 res = dest_name_check(dest, m);
574 if (res)
575 break;
576 res = tipc_multicast(tport->ref,
577 &dest->addr.nameseq,
578 m->msg_iovlen,
579 m->msg_iov,
580 total_len);
581 }
582 if (likely(res != -ELINKCONG)) {
583 if (needs_conn && (res >= 0))
584 sock->state = SS_CONNECTING;
585 break;
586 }
587 if (timeout_val <= 0L) {
588 res = timeout_val ? timeout_val : -EWOULDBLOCK;
589 break;
590 }
591 release_sock(sk);
592 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
593 !tport->congested, timeout_val);
594 lock_sock(sk);
595 } while (1);
596
597exit:
598 if (iocb)
599 release_sock(sk);
600 return res;
601}
602
603/**
604 * send_packet - send a connection-oriented message
605 * @iocb: if NULL, indicates that socket lock is already held
606 * @sock: socket structure
607 * @m: message to send
608 * @total_len: length of message
609 *
610 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
611 *
612 * Returns the number of bytes sent on success, or errno otherwise
613 */
614static int send_packet(struct kiocb *iocb, struct socket *sock,
615 struct msghdr *m, size_t total_len)
616{
617 struct sock *sk = sock->sk;
618 struct tipc_port *tport = tipc_sk_port(sk);
619 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
620 long timeout_val;
621 int res;
622
623 /* Handle implied connection establishment */
624 if (unlikely(dest))
625 return send_msg(iocb, sock, m, total_len);
626
627 if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
628 (m->msg_iovlen > (unsigned int)INT_MAX))
629 return -EMSGSIZE;
630
631 if (iocb)
632 lock_sock(sk);
633
634 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
635
636 do {
637 if (unlikely(sock->state != SS_CONNECTED)) {
638 if (sock->state == SS_DISCONNECTING)
639 res = -EPIPE;
640 else
641 res = -ENOTCONN;
642 break;
643 }
644
645 res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov,
646 total_len);
647 if (likely(res != -ELINKCONG))
648 break;
649 if (timeout_val <= 0L) {
650 res = timeout_val ? timeout_val : -EWOULDBLOCK;
651 break;
652 }
653 release_sock(sk);
654 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
655 (!tport->congested || !tport->connected), timeout_val);
656 lock_sock(sk);
657 } while (1);
658
659 if (iocb)
660 release_sock(sk);
661 return res;
662}
663
664/**
665 * send_stream - send stream-oriented data
666 * @iocb: (unused)
667 * @sock: socket structure
668 * @m: data to send
669 * @total_len: total length of data to be sent
670 *
671 * Used for SOCK_STREAM data.
672 *
673 * Returns the number of bytes sent on success (or partial success),
674 * or errno if no data sent
675 */
676static int send_stream(struct kiocb *iocb, struct socket *sock,
677 struct msghdr *m, size_t total_len)
678{
679 struct sock *sk = sock->sk;
680 struct tipc_port *tport = tipc_sk_port(sk);
681 struct msghdr my_msg;
682 struct iovec my_iov;
683 struct iovec *curr_iov;
684 int curr_iovlen;
685 char __user *curr_start;
686 u32 hdr_size;
687 int curr_left;
688 int bytes_to_send;
689 int bytes_sent;
690 int res;
691
692 lock_sock(sk);
693
694 /* Handle special cases where there is no connection */
695 if (unlikely(sock->state != SS_CONNECTED)) {
696 if (sock->state == SS_UNCONNECTED) {
697 res = send_packet(NULL, sock, m, total_len);
698 goto exit;
699 } else if (sock->state == SS_DISCONNECTING) {
700 res = -EPIPE;
701 goto exit;
702 } else {
703 res = -ENOTCONN;
704 goto exit;
705 }
706 }
707
708 if (unlikely(m->msg_name)) {
709 res = -EISCONN;
710 goto exit;
711 }
712
713 if ((total_len > (unsigned int)INT_MAX) ||
714 (m->msg_iovlen > (unsigned int)INT_MAX)) {
715 res = -EMSGSIZE;
716 goto exit;
717 }
718
719 /*
720 * Send each iovec entry using one or more messages
721 *
722 * Note: This algorithm is good for the most likely case
723 * (i.e. one large iovec entry), but could be improved to pass sets
724 * of small iovec entries into send_packet().
725 */
726 curr_iov = m->msg_iov;
727 curr_iovlen = m->msg_iovlen;
728 my_msg.msg_iov = &my_iov;
729 my_msg.msg_iovlen = 1;
730 my_msg.msg_flags = m->msg_flags;
731 my_msg.msg_name = NULL;
732 bytes_sent = 0;
733
734 hdr_size = msg_hdr_sz(&tport->phdr);
735
736 while (curr_iovlen--) {
737 curr_start = curr_iov->iov_base;
738 curr_left = curr_iov->iov_len;
739
740 while (curr_left) {
741 bytes_to_send = tport->max_pkt - hdr_size;
742 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
743 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
744 if (curr_left < bytes_to_send)
745 bytes_to_send = curr_left;
746 my_iov.iov_base = curr_start;
747 my_iov.iov_len = bytes_to_send;
748 res = send_packet(NULL, sock, &my_msg, bytes_to_send);
749 if (res < 0) {
750 if (bytes_sent)
751 res = bytes_sent;
752 goto exit;
753 }
754 curr_left -= bytes_to_send;
755 curr_start += bytes_to_send;
756 bytes_sent += bytes_to_send;
757 }
758
759 curr_iov++;
760 }
761 res = bytes_sent;
762exit:
763 release_sock(sk);
764 return res;
765}
766
767/**
768 * auto_connect - complete connection setup to a remote port
769 * @sock: socket structure
770 * @msg: peer's response message
771 *
772 * Returns 0 on success, errno otherwise
773 */
774static int auto_connect(struct socket *sock, struct tipc_msg *msg)
775{
776 struct tipc_sock *tsock = tipc_sk(sock->sk);
777
778 if (msg_errcode(msg)) {
779 sock->state = SS_DISCONNECTING;
780 return -ECONNREFUSED;
781 }
782
783 tsock->peer_name.ref = msg_origport(msg);
784 tsock->peer_name.node = msg_orignode(msg);
785 tipc_connect2port(tsock->p->ref, &tsock->peer_name);
786 tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
787 sock->state = SS_CONNECTED;
788 return 0;
789}
790
791/**
792 * set_orig_addr - capture sender's address for received message
793 * @m: descriptor for message info
794 * @msg: received message header
795 *
796 * Note: Address is not captured if not requested by receiver.
797 */
798static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
799{
800 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
801
802 if (addr) {
803 addr->family = AF_TIPC;
804 addr->addrtype = TIPC_ADDR_ID;
805 addr->addr.id.ref = msg_origport(msg);
806 addr->addr.id.node = msg_orignode(msg);
807 addr->addr.name.domain = 0; /* could leave uninitialized */
808 addr->scope = 0; /* could leave uninitialized */
809 m->msg_namelen = sizeof(struct sockaddr_tipc);
810 }
811}
812
813/**
814 * anc_data_recv - optionally capture ancillary data for received message
815 * @m: descriptor for message info
816 * @msg: received message header
817 * @tport: TIPC port associated with message
818 *
819 * Note: Ancillary data is not captured if not requested by receiver.
820 *
821 * Returns 0 if successful, otherwise errno
822 */
823static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
824 struct tipc_port *tport)
825{
826 u32 anc_data[3];
827 u32 err;
828 u32 dest_type;
829 int has_name;
830 int res;
831
832 if (likely(m->msg_controllen == 0))
833 return 0;
834
835 /* Optionally capture errored message object(s) */
836 err = msg ? msg_errcode(msg) : 0;
837 if (unlikely(err)) {
838 anc_data[0] = err;
839 anc_data[1] = msg_data_sz(msg);
840 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
841 if (res)
842 return res;
843 if (anc_data[1]) {
844 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
845 msg_data(msg));
846 if (res)
847 return res;
848 }
849 }
850
851 /* Optionally capture message destination object */
852 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
853 switch (dest_type) {
854 case TIPC_NAMED_MSG:
855 has_name = 1;
856 anc_data[0] = msg_nametype(msg);
857 anc_data[1] = msg_namelower(msg);
858 anc_data[2] = msg_namelower(msg);
859 break;
860 case TIPC_MCAST_MSG:
861 has_name = 1;
862 anc_data[0] = msg_nametype(msg);
863 anc_data[1] = msg_namelower(msg);
864 anc_data[2] = msg_nameupper(msg);
865 break;
866 case TIPC_CONN_MSG:
867 has_name = (tport->conn_type != 0);
868 anc_data[0] = tport->conn_type;
869 anc_data[1] = tport->conn_instance;
870 anc_data[2] = tport->conn_instance;
871 break;
872 default:
873 has_name = 0;
874 }
875 if (has_name) {
876 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
877 if (res)
878 return res;
879 }
880
881 return 0;
882}
883
884/**
885 * recv_msg - receive packet-oriented message
886 * @iocb: (unused)
887 * @m: descriptor for message info
888 * @buf_len: total size of user buffer area
889 * @flags: receive flags
890 *
891 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
892 * If the complete message doesn't fit in user area, truncate it.
893 *
894 * Returns size of returned message data, errno otherwise
895 */
896static int recv_msg(struct kiocb *iocb, struct socket *sock,
897 struct msghdr *m, size_t buf_len, int flags)
898{
899 struct sock *sk = sock->sk;
900 struct tipc_port *tport = tipc_sk_port(sk);
901 struct sk_buff *buf;
902 struct tipc_msg *msg;
903 long timeout;
904 unsigned int sz;
905 u32 err;
906 int res;
907
908 /* Catch invalid receive requests */
909 if (unlikely(!buf_len))
910 return -EINVAL;
911
912 lock_sock(sk);
913
914 if (unlikely(sock->state == SS_UNCONNECTED)) {
915 res = -ENOTCONN;
916 goto exit;
917 }
918
919 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
920restart:
921
922 /* Look for a message in receive queue; wait if necessary */
923 while (skb_queue_empty(&sk->sk_receive_queue)) {
924 if (sock->state == SS_DISCONNECTING) {
925 res = -ENOTCONN;
926 goto exit;
927 }
928 if (timeout <= 0L) {
929 res = timeout ? timeout : -EWOULDBLOCK;
930 goto exit;
931 }
932 release_sock(sk);
933 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
934 tipc_rx_ready(sock),
935 timeout);
936 lock_sock(sk);
937 }
938
939 /* Look at first message in receive queue */
940 buf = skb_peek(&sk->sk_receive_queue);
941 msg = buf_msg(buf);
942 sz = msg_data_sz(msg);
943 err = msg_errcode(msg);
944
945 /* Complete connection setup for an implied connect */
946 if (unlikely(sock->state == SS_CONNECTING)) {
947 res = auto_connect(sock, msg);
948 if (res)
949 goto exit;
950 }
951
952 /* Discard an empty non-errored message & try again */
953 if ((!sz) && (!err)) {
954 advance_rx_queue(sk);
955 goto restart;
956 }
957
958 /* Capture sender's address (optional) */
959 set_orig_addr(m, msg);
960
961 /* Capture ancillary data (optional) */
962 res = anc_data_recv(m, msg, tport);
963 if (res)
964 goto exit;
965
966 /* Capture message data (if valid) & compute return value (always) */
967 if (!err) {
968 if (unlikely(buf_len < sz)) {
969 sz = buf_len;
970 m->msg_flags |= MSG_TRUNC;
971 }
972 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
973 m->msg_iov, sz);
974 if (res)
975 goto exit;
976 res = sz;
977 } else {
978 if ((sock->state == SS_READY) ||
979 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
980 res = 0;
981 else
982 res = -ECONNRESET;
983 }
984
985 /* Consume received message (optional) */
986 if (likely(!(flags & MSG_PEEK))) {
987 if ((sock->state != SS_READY) &&
988 (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
989 tipc_acknowledge(tport->ref, tport->conn_unacked);
990 advance_rx_queue(sk);
991 }
992exit:
993 release_sock(sk);
994 return res;
995}
996
997/**
998 * recv_stream - receive stream-oriented data
999 * @iocb: (unused)
1000 * @m: descriptor for message info
1001 * @buf_len: total size of user buffer area
1002 * @flags: receive flags
1003 *
1004 * Used for SOCK_STREAM messages only. If not enough data is available
1005 * will optionally wait for more; never truncates data.
1006 *
1007 * Returns size of returned message data, errno otherwise
1008 */
1009static int recv_stream(struct kiocb *iocb, struct socket *sock,
1010 struct msghdr *m, size_t buf_len, int flags)
1011{
1012 struct sock *sk = sock->sk;
1013 struct tipc_port *tport = tipc_sk_port(sk);
1014 struct sk_buff *buf;
1015 struct tipc_msg *msg;
1016 long timeout;
1017 unsigned int sz;
1018 int sz_to_copy, target, needed;
1019 int sz_copied = 0;
1020 u32 err;
1021 int res = 0;
1022
1023 /* Catch invalid receive attempts */
1024 if (unlikely(!buf_len))
1025 return -EINVAL;
1026
1027 lock_sock(sk);
1028
1029 if (unlikely((sock->state == SS_UNCONNECTED) ||
1030 (sock->state == SS_CONNECTING))) {
1031 res = -ENOTCONN;
1032 goto exit;
1033 }
1034
1035 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1036 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1037
1038restart:
1039 /* Look for a message in receive queue; wait if necessary */
1040 while (skb_queue_empty(&sk->sk_receive_queue)) {
1041 if (sock->state == SS_DISCONNECTING) {
1042 res = -ENOTCONN;
1043 goto exit;
1044 }
1045 if (timeout <= 0L) {
1046 res = timeout ? timeout : -EWOULDBLOCK;
1047 goto exit;
1048 }
1049 release_sock(sk);
1050 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
1051 tipc_rx_ready(sock),
1052 timeout);
1053 lock_sock(sk);
1054 }
1055
1056 /* Look at first message in receive queue */
1057 buf = skb_peek(&sk->sk_receive_queue);
1058 msg = buf_msg(buf);
1059 sz = msg_data_sz(msg);
1060 err = msg_errcode(msg);
1061
1062 /* Discard an empty non-errored message & try again */
1063 if ((!sz) && (!err)) {
1064 advance_rx_queue(sk);
1065 goto restart;
1066 }
1067
1068 /* Optionally capture sender's address & ancillary data of first msg */
1069 if (sz_copied == 0) {
1070 set_orig_addr(m, msg);
1071 res = anc_data_recv(m, msg, tport);
1072 if (res)
1073 goto exit;
1074 }
1075
1076 /* Capture message data (if valid) & compute return value (always) */
1077 if (!err) {
1078 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1079
1080 sz -= offset;
1081 needed = (buf_len - sz_copied);
1082 sz_to_copy = (sz <= needed) ? sz : needed;
1083
1084 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1085 m->msg_iov, sz_to_copy);
1086 if (res)
1087 goto exit;
1088
1089 sz_copied += sz_to_copy;
1090
1091 if (sz_to_copy < sz) {
1092 if (!(flags & MSG_PEEK))
1093 TIPC_SKB_CB(buf)->handle =
1094 (void *)(unsigned long)(offset + sz_to_copy);
1095 goto exit;
1096 }
1097 } else {
1098 if (sz_copied != 0)
1099 goto exit; /* can't add error msg to valid data */
1100
1101 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1102 res = 0;
1103 else
1104 res = -ECONNRESET;
1105 }
1106
1107 /* Consume received message (optional) */
1108 if (likely(!(flags & MSG_PEEK))) {
1109 if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1110 tipc_acknowledge(tport->ref, tport->conn_unacked);
1111 advance_rx_queue(sk);
1112 }
1113
1114 /* Loop around if more data is required */
1115 if ((sz_copied < buf_len) && /* didn't get all requested data */
1116 (!skb_queue_empty(&sk->sk_receive_queue) ||
1117 (sz_copied < target)) && /* and more is ready or required */
1118 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1119 (!err)) /* and haven't reached a FIN */
1120 goto restart;
1121
1122exit:
1123 release_sock(sk);
1124 return sz_copied ? sz_copied : res;
1125}
1126
1127/**
1128 * rx_queue_full - determine if receive queue can accept another message
1129 * @msg: message to be added to queue
1130 * @queue_size: current size of queue
1131 * @base: nominal maximum size of queue
1132 *
1133 * Returns 1 if queue is unable to accept message, 0 otherwise
1134 */
1135static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base)
1136{
1137 u32 threshold;
1138 u32 imp = msg_importance(msg);
1139
1140 if (imp == TIPC_LOW_IMPORTANCE)
1141 threshold = base;
1142 else if (imp == TIPC_MEDIUM_IMPORTANCE)
1143 threshold = base * 2;
1144 else if (imp == TIPC_HIGH_IMPORTANCE)
1145 threshold = base * 100;
1146 else
1147 return 0;
1148
1149 if (msg_connected(msg))
1150 threshold *= 4;
1151
1152 return queue_size >= threshold;
1153}
1154
1155/**
1156 * filter_rcv - validate incoming message
1157 * @sk: socket
1158 * @buf: message
1159 *
1160 * Enqueues message on receive queue if acceptable; optionally handles
1161 * disconnect indication for a connected socket.
1162 *
1163 * Called with socket lock already taken; port lock may also be taken.
1164 *
1165 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1166 */
1167static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
1168{
1169 struct socket *sock = sk->sk_socket;
1170 struct tipc_msg *msg = buf_msg(buf);
1171 u32 recv_q_len;
1172
1173 /* Reject message if it is wrong sort of message for socket */
1174 if (msg_type(msg) > TIPC_DIRECT_MSG)
1175 return TIPC_ERR_NO_PORT;
1176
1177 if (sock->state == SS_READY) {
1178 if (msg_connected(msg))
1179 return TIPC_ERR_NO_PORT;
1180 } else {
1181 if (msg_mcast(msg))
1182 return TIPC_ERR_NO_PORT;
1183 if (sock->state == SS_CONNECTED) {
1184 if (!msg_connected(msg) ||
1185 !tipc_port_peer_msg(tipc_sk_port(sk), msg))
1186 return TIPC_ERR_NO_PORT;
1187 } else if (sock->state == SS_CONNECTING) {
1188 if (!msg_connected(msg) && (msg_errcode(msg) == 0))
1189 return TIPC_ERR_NO_PORT;
1190 } else if (sock->state == SS_LISTENING) {
1191 if (msg_connected(msg) || msg_errcode(msg))
1192 return TIPC_ERR_NO_PORT;
1193 } else if (sock->state == SS_DISCONNECTING) {
1194 return TIPC_ERR_NO_PORT;
1195 } else /* (sock->state == SS_UNCONNECTED) */ {
1196 if (msg_connected(msg) || msg_errcode(msg))
1197 return TIPC_ERR_NO_PORT;
1198 }
1199 }
1200
1201 /* Reject message if there isn't room to queue it */
1202 recv_q_len = (u32)atomic_read(&tipc_queue_size);
1203 if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) {
1204 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE))
1205 return TIPC_ERR_OVERLOAD;
1206 }
1207 recv_q_len = skb_queue_len(&sk->sk_receive_queue);
1208 if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) {
1209 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2))
1210 return TIPC_ERR_OVERLOAD;
1211 }
1212
1213 /* Enqueue message (finally!) */
1214 TIPC_SKB_CB(buf)->handle = 0;
1215 atomic_inc(&tipc_queue_size);
1216 __skb_queue_tail(&sk->sk_receive_queue, buf);
1217
1218 /* Initiate connection termination for an incoming 'FIN' */
1219 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
1220 sock->state = SS_DISCONNECTING;
1221 tipc_disconnect_port(tipc_sk_port(sk));
1222 }
1223
1224 if (waitqueue_active(sk_sleep(sk)))
1225 wake_up_interruptible(sk_sleep(sk));
1226 return TIPC_OK;
1227}
1228
1229/**
1230 * backlog_rcv - handle incoming message from backlog queue
1231 * @sk: socket
1232 * @buf: message
1233 *
1234 * Caller must hold socket lock, but not port lock.
1235 *
1236 * Returns 0
1237 */
1238static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1239{
1240 u32 res;
1241
1242 res = filter_rcv(sk, buf);
1243 if (res)
1244 tipc_reject_msg(buf, res);
1245 return 0;
1246}
1247
1248/**
1249 * dispatch - handle incoming message
1250 * @tport: TIPC port that received message
1251 * @buf: message
1252 *
1253 * Called with port lock already taken.
1254 *
1255 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1256 */
1257static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1258{
1259 struct sock *sk = (struct sock *)tport->usr_handle;
1260 u32 res;
1261
1262 /*
1263 * Process message if socket is unlocked; otherwise add to backlog queue
1264 *
1265 * This code is based on sk_receive_skb(), but must be distinct from it
1266 * since a TIPC-specific filter/reject mechanism is utilized
1267 */
1268 bh_lock_sock(sk);
1269 if (!sock_owned_by_user(sk)) {
1270 res = filter_rcv(sk, buf);
1271 } else {
1272 if (sk_add_backlog(sk, buf, sk->sk_rcvbuf))
1273 res = TIPC_ERR_OVERLOAD;
1274 else
1275 res = TIPC_OK;
1276 }
1277 bh_unlock_sock(sk);
1278
1279 return res;
1280}
1281
1282/**
1283 * wakeupdispatch - wake up port after congestion
1284 * @tport: port to wakeup
1285 *
1286 * Called with port lock already taken.
1287 */
1288static void wakeupdispatch(struct tipc_port *tport)
1289{
1290 struct sock *sk = (struct sock *)tport->usr_handle;
1291
1292 if (waitqueue_active(sk_sleep(sk)))
1293 wake_up_interruptible(sk_sleep(sk));
1294}
1295
1296/**
1297 * connect - establish a connection to another TIPC port
1298 * @sock: socket structure
1299 * @dest: socket address for destination port
1300 * @destlen: size of socket address data structure
1301 * @flags: file-related flags associated with socket
1302 *
1303 * Returns 0 on success, errno otherwise
1304 */
1305static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
1306 int flags)
1307{
1308 struct sock *sk = sock->sk;
1309 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1310 struct msghdr m = {NULL,};
1311 struct sk_buff *buf;
1312 struct tipc_msg *msg;
1313 unsigned int timeout;
1314 int res;
1315
1316 lock_sock(sk);
1317
1318 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1319 if (sock->state == SS_READY) {
1320 res = -EOPNOTSUPP;
1321 goto exit;
1322 }
1323
1324 /* For now, TIPC does not support the non-blocking form of connect() */
1325 if (flags & O_NONBLOCK) {
1326 res = -EOPNOTSUPP;
1327 goto exit;
1328 }
1329
1330 /* Issue Posix-compliant error code if socket is in the wrong state */
1331 if (sock->state == SS_LISTENING) {
1332 res = -EOPNOTSUPP;
1333 goto exit;
1334 }
1335 if (sock->state == SS_CONNECTING) {
1336 res = -EALREADY;
1337 goto exit;
1338 }
1339 if (sock->state != SS_UNCONNECTED) {
1340 res = -EISCONN;
1341 goto exit;
1342 }
1343
1344 /*
1345 * Reject connection attempt using multicast address
1346 *
1347 * Note: send_msg() validates the rest of the address fields,
1348 * so there's no need to do it here
1349 */
1350 if (dst->addrtype == TIPC_ADDR_MCAST) {
1351 res = -EINVAL;
1352 goto exit;
1353 }
1354
1355 /* Reject any messages already in receive queue (very unlikely) */
1356 reject_rx_queue(sk);
1357
1358 /* Send a 'SYN-' to destination */
1359 m.msg_name = dest;
1360 m.msg_namelen = destlen;
1361 res = send_msg(NULL, sock, &m, 0);
1362 if (res < 0)
1363 goto exit;
1364
1365 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1366 timeout = tipc_sk(sk)->conn_timeout;
1367 release_sock(sk);
1368 res = wait_event_interruptible_timeout(*sk_sleep(sk),
1369 (!skb_queue_empty(&sk->sk_receive_queue) ||
1370 (sock->state != SS_CONNECTING)),
1371 timeout ? (long)msecs_to_jiffies(timeout)
1372 : MAX_SCHEDULE_TIMEOUT);
1373 lock_sock(sk);
1374
1375 if (res > 0) {
1376 buf = skb_peek(&sk->sk_receive_queue);
1377 if (buf != NULL) {
1378 msg = buf_msg(buf);
1379 res = auto_connect(sock, msg);
1380 if (!res) {
1381 if (!msg_data_sz(msg))
1382 advance_rx_queue(sk);
1383 }
1384 } else {
1385 if (sock->state == SS_CONNECTED)
1386 res = -EISCONN;
1387 else
1388 res = -ECONNREFUSED;
1389 }
1390 } else {
1391 if (res == 0)
1392 res = -ETIMEDOUT;
1393 else
1394 ; /* leave "res" unchanged */
1395 sock->state = SS_DISCONNECTING;
1396 }
1397
1398exit:
1399 release_sock(sk);
1400 return res;
1401}
1402
1403/**
1404 * listen - allow socket to listen for incoming connections
1405 * @sock: socket structure
1406 * @len: (unused)
1407 *
1408 * Returns 0 on success, errno otherwise
1409 */
1410static int listen(struct socket *sock, int len)
1411{
1412 struct sock *sk = sock->sk;
1413 int res;
1414
1415 lock_sock(sk);
1416
1417 if (sock->state != SS_UNCONNECTED)
1418 res = -EINVAL;
1419 else {
1420 sock->state = SS_LISTENING;
1421 res = 0;
1422 }
1423
1424 release_sock(sk);
1425 return res;
1426}
1427
1428/**
1429 * accept - wait for connection request
1430 * @sock: listening socket
1431 * @newsock: new socket that is to be connected
1432 * @flags: file-related flags associated with socket
1433 *
1434 * Returns 0 on success, errno otherwise
1435 */
1436static int accept(struct socket *sock, struct socket *new_sock, int flags)
1437{
1438 struct sock *sk = sock->sk;
1439 struct sk_buff *buf;
1440 int res;
1441
1442 lock_sock(sk);
1443
1444 if (sock->state != SS_LISTENING) {
1445 res = -EINVAL;
1446 goto exit;
1447 }
1448
1449 while (skb_queue_empty(&sk->sk_receive_queue)) {
1450 if (flags & O_NONBLOCK) {
1451 res = -EWOULDBLOCK;
1452 goto exit;
1453 }
1454 release_sock(sk);
1455 res = wait_event_interruptible(*sk_sleep(sk),
1456 (!skb_queue_empty(&sk->sk_receive_queue)));
1457 lock_sock(sk);
1458 if (res)
1459 goto exit;
1460 }
1461
1462 buf = skb_peek(&sk->sk_receive_queue);
1463
1464 res = tipc_create(sock_net(sock->sk), new_sock, 0, 0);
1465 if (!res) {
1466 struct sock *new_sk = new_sock->sk;
1467 struct tipc_sock *new_tsock = tipc_sk(new_sk);
1468 struct tipc_port *new_tport = new_tsock->p;
1469 u32 new_ref = new_tport->ref;
1470 struct tipc_msg *msg = buf_msg(buf);
1471
1472 lock_sock(new_sk);
1473
1474 /*
1475 * Reject any stray messages received by new socket
1476 * before the socket lock was taken (very, very unlikely)
1477 */
1478 reject_rx_queue(new_sk);
1479
1480 /* Connect new socket to it's peer */
1481 new_tsock->peer_name.ref = msg_origport(msg);
1482 new_tsock->peer_name.node = msg_orignode(msg);
1483 tipc_connect2port(new_ref, &new_tsock->peer_name);
1484 new_sock->state = SS_CONNECTED;
1485
1486 tipc_set_portimportance(new_ref, msg_importance(msg));
1487 if (msg_named(msg)) {
1488 new_tport->conn_type = msg_nametype(msg);
1489 new_tport->conn_instance = msg_nameinst(msg);
1490 }
1491
1492 /*
1493 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1494 * Respond to 'SYN+' by queuing it on new socket.
1495 */
1496 if (!msg_data_sz(msg)) {
1497 struct msghdr m = {NULL,};
1498
1499 advance_rx_queue(sk);
1500 send_packet(NULL, new_sock, &m, 0);
1501 } else {
1502 __skb_dequeue(&sk->sk_receive_queue);
1503 __skb_queue_head(&new_sk->sk_receive_queue, buf);
1504 }
1505 release_sock(new_sk);
1506 }
1507exit:
1508 release_sock(sk);
1509 return res;
1510}
1511
1512/**
1513 * shutdown - shutdown socket connection
1514 * @sock: socket structure
1515 * @how: direction to close (must be SHUT_RDWR)
1516 *
1517 * Terminates connection (if necessary), then purges socket's receive queue.
1518 *
1519 * Returns 0 on success, errno otherwise
1520 */
1521static int shutdown(struct socket *sock, int how)
1522{
1523 struct sock *sk = sock->sk;
1524 struct tipc_port *tport = tipc_sk_port(sk);
1525 struct sk_buff *buf;
1526 int res;
1527
1528 if (how != SHUT_RDWR)
1529 return -EINVAL;
1530
1531 lock_sock(sk);
1532
1533 switch (sock->state) {
1534 case SS_CONNECTING:
1535 case SS_CONNECTED:
1536
1537restart:
1538 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1539 buf = __skb_dequeue(&sk->sk_receive_queue);
1540 if (buf) {
1541 atomic_dec(&tipc_queue_size);
1542 if (TIPC_SKB_CB(buf)->handle != 0) {
1543 kfree_skb(buf);
1544 goto restart;
1545 }
1546 tipc_disconnect(tport->ref);
1547 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1548 } else {
1549 tipc_shutdown(tport->ref);
1550 }
1551
1552 sock->state = SS_DISCONNECTING;
1553
1554 /* fall through */
1555
1556 case SS_DISCONNECTING:
1557
1558 /* Discard any unreceived messages; wake up sleeping tasks */
1559 discard_rx_queue(sk);
1560 if (waitqueue_active(sk_sleep(sk)))
1561 wake_up_interruptible(sk_sleep(sk));
1562 res = 0;
1563 break;
1564
1565 default:
1566 res = -ENOTCONN;
1567 }
1568
1569 release_sock(sk);
1570 return res;
1571}
1572
1573/**
1574 * setsockopt - set socket option
1575 * @sock: socket structure
1576 * @lvl: option level
1577 * @opt: option identifier
1578 * @ov: pointer to new option value
1579 * @ol: length of option value
1580 *
1581 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1582 * (to ease compatibility).
1583 *
1584 * Returns 0 on success, errno otherwise
1585 */
1586static int setsockopt(struct socket *sock,
1587 int lvl, int opt, char __user *ov, unsigned int ol)
1588{
1589 struct sock *sk = sock->sk;
1590 struct tipc_port *tport = tipc_sk_port(sk);
1591 u32 value;
1592 int res;
1593
1594 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1595 return 0;
1596 if (lvl != SOL_TIPC)
1597 return -ENOPROTOOPT;
1598 if (ol < sizeof(value))
1599 return -EINVAL;
1600 res = get_user(value, (u32 __user *)ov);
1601 if (res)
1602 return res;
1603
1604 lock_sock(sk);
1605
1606 switch (opt) {
1607 case TIPC_IMPORTANCE:
1608 res = tipc_set_portimportance(tport->ref, value);
1609 break;
1610 case TIPC_SRC_DROPPABLE:
1611 if (sock->type != SOCK_STREAM)
1612 res = tipc_set_portunreliable(tport->ref, value);
1613 else
1614 res = -ENOPROTOOPT;
1615 break;
1616 case TIPC_DEST_DROPPABLE:
1617 res = tipc_set_portunreturnable(tport->ref, value);
1618 break;
1619 case TIPC_CONN_TIMEOUT:
1620 tipc_sk(sk)->conn_timeout = value;
1621 /* no need to set "res", since already 0 at this point */
1622 break;
1623 default:
1624 res = -EINVAL;
1625 }
1626
1627 release_sock(sk);
1628
1629 return res;
1630}
1631
1632/**
1633 * getsockopt - get socket option
1634 * @sock: socket structure
1635 * @lvl: option level
1636 * @opt: option identifier
1637 * @ov: receptacle for option value
1638 * @ol: receptacle for length of option value
1639 *
1640 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1641 * (to ease compatibility).
1642 *
1643 * Returns 0 on success, errno otherwise
1644 */
1645static int getsockopt(struct socket *sock,
1646 int lvl, int opt, char __user *ov, int __user *ol)
1647{
1648 struct sock *sk = sock->sk;
1649 struct tipc_port *tport = tipc_sk_port(sk);
1650 int len;
1651 u32 value;
1652 int res;
1653
1654 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1655 return put_user(0, ol);
1656 if (lvl != SOL_TIPC)
1657 return -ENOPROTOOPT;
1658 res = get_user(len, ol);
1659 if (res)
1660 return res;
1661
1662 lock_sock(sk);
1663
1664 switch (opt) {
1665 case TIPC_IMPORTANCE:
1666 res = tipc_portimportance(tport->ref, &value);
1667 break;
1668 case TIPC_SRC_DROPPABLE:
1669 res = tipc_portunreliable(tport->ref, &value);
1670 break;
1671 case TIPC_DEST_DROPPABLE:
1672 res = tipc_portunreturnable(tport->ref, &value);
1673 break;
1674 case TIPC_CONN_TIMEOUT:
1675 value = tipc_sk(sk)->conn_timeout;
1676 /* no need to set "res", since already 0 at this point */
1677 break;
1678 case TIPC_NODE_RECVQ_DEPTH:
1679 value = (u32)atomic_read(&tipc_queue_size);
1680 break;
1681 case TIPC_SOCK_RECVQ_DEPTH:
1682 value = skb_queue_len(&sk->sk_receive_queue);
1683 break;
1684 default:
1685 res = -EINVAL;
1686 }
1687
1688 release_sock(sk);
1689
1690 if (res)
1691 return res; /* "get" failed */
1692
1693 if (len < sizeof(value))
1694 return -EINVAL;
1695
1696 if (copy_to_user(ov, &value, sizeof(value)))
1697 return -EFAULT;
1698
1699 return put_user(sizeof(value), ol);
1700}
1701
1702/**
1703 * Protocol switches for the various types of TIPC sockets
1704 */
1705static const struct proto_ops msg_ops = {
1706 .owner = THIS_MODULE,
1707 .family = AF_TIPC,
1708 .release = release,
1709 .bind = bind,
1710 .connect = connect,
1711 .socketpair = sock_no_socketpair,
1712 .accept = sock_no_accept,
1713 .getname = get_name,
1714 .poll = poll,
1715 .ioctl = sock_no_ioctl,
1716 .listen = sock_no_listen,
1717 .shutdown = shutdown,
1718 .setsockopt = setsockopt,
1719 .getsockopt = getsockopt,
1720 .sendmsg = send_msg,
1721 .recvmsg = recv_msg,
1722 .mmap = sock_no_mmap,
1723 .sendpage = sock_no_sendpage
1724};
1725
1726static const struct proto_ops packet_ops = {
1727 .owner = THIS_MODULE,
1728 .family = AF_TIPC,
1729 .release = release,
1730 .bind = bind,
1731 .connect = connect,
1732 .socketpair = sock_no_socketpair,
1733 .accept = accept,
1734 .getname = get_name,
1735 .poll = poll,
1736 .ioctl = sock_no_ioctl,
1737 .listen = listen,
1738 .shutdown = shutdown,
1739 .setsockopt = setsockopt,
1740 .getsockopt = getsockopt,
1741 .sendmsg = send_packet,
1742 .recvmsg = recv_msg,
1743 .mmap = sock_no_mmap,
1744 .sendpage = sock_no_sendpage
1745};
1746
1747static const struct proto_ops stream_ops = {
1748 .owner = THIS_MODULE,
1749 .family = AF_TIPC,
1750 .release = release,
1751 .bind = bind,
1752 .connect = connect,
1753 .socketpair = sock_no_socketpair,
1754 .accept = accept,
1755 .getname = get_name,
1756 .poll = poll,
1757 .ioctl = sock_no_ioctl,
1758 .listen = listen,
1759 .shutdown = shutdown,
1760 .setsockopt = setsockopt,
1761 .getsockopt = getsockopt,
1762 .sendmsg = send_stream,
1763 .recvmsg = recv_stream,
1764 .mmap = sock_no_mmap,
1765 .sendpage = sock_no_sendpage
1766};
1767
1768static const struct net_proto_family tipc_family_ops = {
1769 .owner = THIS_MODULE,
1770 .family = AF_TIPC,
1771 .create = tipc_create
1772};
1773
1774static struct proto tipc_proto = {
1775 .name = "TIPC",
1776 .owner = THIS_MODULE,
1777 .obj_size = sizeof(struct tipc_sock)
1778};
1779
1780/**
1781 * tipc_socket_init - initialize TIPC socket interface
1782 *
1783 * Returns 0 on success, errno otherwise
1784 */
1785int tipc_socket_init(void)
1786{
1787 int res;
1788
1789 res = proto_register(&tipc_proto, 1);
1790 if (res) {
1791 err("Failed to register TIPC protocol type\n");
1792 goto out;
1793 }
1794
1795 res = sock_register(&tipc_family_ops);
1796 if (res) {
1797 err("Failed to register TIPC socket type\n");
1798 proto_unregister(&tipc_proto);
1799 goto out;
1800 }
1801
1802 sockets_enabled = 1;
1803 out:
1804 return res;
1805}
1806
1807/**
1808 * tipc_socket_stop - stop TIPC socket interface
1809 */
1810void tipc_socket_stop(void)
1811{
1812 if (!sockets_enabled)
1813 return;
1814
1815 sockets_enabled = 0;
1816 sock_unregister(tipc_family_ops.family);
1817 proto_unregister(&tipc_proto);
1818}