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