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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
50#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
51#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
52#define TIPC_FWD_MSG 1
53#define TIPC_MAX_PORT 0xffffffff
54#define TIPC_MIN_PORT 1
55#define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
56
57enum {
58 TIPC_LISTEN = TCP_LISTEN,
59 TIPC_ESTABLISHED = TCP_ESTABLISHED,
60 TIPC_OPEN = TCP_CLOSE,
61 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
62 TIPC_CONNECTING = TCP_SYN_SENT,
63};
64
65struct sockaddr_pair {
66 struct sockaddr_tipc sock;
67 struct sockaddr_tipc member;
68};
69
70/**
71 * struct tipc_sock - TIPC socket structure
72 * @sk: socket - interacts with 'port' and with user via the socket API
73 * @conn_type: TIPC type used when connection was established
74 * @conn_instance: TIPC instance used when connection was established
75 * @published: non-zero if port has one or more associated names
76 * @max_pkt: maximum packet size "hint" used when building messages sent by port
77 * @portid: unique port identity in TIPC socket hash table
78 * @phdr: preformatted message header used when sending messages
79 * #cong_links: list of congested links
80 * @publications: list of publications for port
81 * @blocking_link: address of the congested link we are currently sleeping on
82 * @pub_count: total # of publications port has made during its lifetime
83 * @probing_state:
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 uint conn_timeout;
106 atomic_t dupl_rcvcnt;
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 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
238}
239
240/* tipc_sk_respond() : send response message back to sender
241 */
242static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
243{
244 u32 selector;
245 u32 dnode;
246 u32 onode = tipc_own_addr(sock_net(sk));
247
248 if (!tipc_msg_reverse(onode, &skb, err))
249 return;
250
251 dnode = msg_destnode(buf_msg(skb));
252 selector = msg_origport(buf_msg(skb));
253 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
254}
255
256/**
257 * tsk_rej_rx_queue - reject all buffers in socket receive queue
258 *
259 * Caller must hold socket lock
260 */
261static void tsk_rej_rx_queue(struct sock *sk)
262{
263 struct sk_buff *skb;
264
265 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
266 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
267}
268
269static bool tipc_sk_connected(struct sock *sk)
270{
271 return sk->sk_state == TIPC_ESTABLISHED;
272}
273
274/* tipc_sk_type_connectionless - check if the socket is datagram socket
275 * @sk: socket
276 *
277 * Returns true if connection less, false otherwise
278 */
279static bool tipc_sk_type_connectionless(struct sock *sk)
280{
281 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
282}
283
284/* tsk_peer_msg - verify if message was sent by connected port's peer
285 *
286 * Handles cases where the node's network address has changed from
287 * the default of <0.0.0> to its configured setting.
288 */
289static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
290{
291 struct sock *sk = &tsk->sk;
292 u32 self = tipc_own_addr(sock_net(sk));
293 u32 peer_port = tsk_peer_port(tsk);
294 u32 orig_node, peer_node;
295
296 if (unlikely(!tipc_sk_connected(sk)))
297 return false;
298
299 if (unlikely(msg_origport(msg) != peer_port))
300 return false;
301
302 orig_node = msg_orignode(msg);
303 peer_node = tsk_peer_node(tsk);
304
305 if (likely(orig_node == peer_node))
306 return true;
307
308 if (!orig_node && peer_node == self)
309 return true;
310
311 if (!peer_node && orig_node == self)
312 return true;
313
314 return false;
315}
316
317/* tipc_set_sk_state - set the sk_state of the socket
318 * @sk: socket
319 *
320 * Caller must hold socket lock
321 *
322 * Returns 0 on success, errno otherwise
323 */
324static int tipc_set_sk_state(struct sock *sk, int state)
325{
326 int oldsk_state = sk->sk_state;
327 int res = -EINVAL;
328
329 switch (state) {
330 case TIPC_OPEN:
331 res = 0;
332 break;
333 case TIPC_LISTEN:
334 case TIPC_CONNECTING:
335 if (oldsk_state == TIPC_OPEN)
336 res = 0;
337 break;
338 case TIPC_ESTABLISHED:
339 if (oldsk_state == TIPC_CONNECTING ||
340 oldsk_state == TIPC_OPEN)
341 res = 0;
342 break;
343 case TIPC_DISCONNECTING:
344 if (oldsk_state == TIPC_CONNECTING ||
345 oldsk_state == TIPC_ESTABLISHED)
346 res = 0;
347 break;
348 }
349
350 if (!res)
351 sk->sk_state = state;
352
353 return res;
354}
355
356static int tipc_sk_sock_err(struct socket *sock, long *timeout)
357{
358 struct sock *sk = sock->sk;
359 int err = sock_error(sk);
360 int typ = sock->type;
361
362 if (err)
363 return err;
364 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
365 if (sk->sk_state == TIPC_DISCONNECTING)
366 return -EPIPE;
367 else if (!tipc_sk_connected(sk))
368 return -ENOTCONN;
369 }
370 if (!*timeout)
371 return -EAGAIN;
372 if (signal_pending(current))
373 return sock_intr_errno(*timeout);
374
375 return 0;
376}
377
378#define tipc_wait_for_cond(sock_, timeo_, condition_) \
379({ \
380 struct sock *sk_; \
381 int rc_; \
382 \
383 while ((rc_ = !(condition_))) { \
384 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
385 sk_ = (sock_)->sk; \
386 rc_ = tipc_sk_sock_err((sock_), timeo_); \
387 if (rc_) \
388 break; \
389 prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE); \
390 release_sock(sk_); \
391 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
392 sched_annotate_sleep(); \
393 lock_sock(sk_); \
394 remove_wait_queue(sk_sleep(sk_), &wait_); \
395 } \
396 rc_; \
397})
398
399/**
400 * tipc_sk_create - create a TIPC socket
401 * @net: network namespace (must be default network)
402 * @sock: pre-allocated socket structure
403 * @protocol: protocol indicator (must be 0)
404 * @kern: caused by kernel or by userspace?
405 *
406 * This routine creates additional data structures used by the TIPC socket,
407 * initializes them, and links them together.
408 *
409 * Returns 0 on success, errno otherwise
410 */
411static int tipc_sk_create(struct net *net, struct socket *sock,
412 int protocol, int kern)
413{
414 struct tipc_net *tn;
415 const struct proto_ops *ops;
416 struct sock *sk;
417 struct tipc_sock *tsk;
418 struct tipc_msg *msg;
419
420 /* Validate arguments */
421 if (unlikely(protocol != 0))
422 return -EPROTONOSUPPORT;
423
424 switch (sock->type) {
425 case SOCK_STREAM:
426 ops = &stream_ops;
427 break;
428 case SOCK_SEQPACKET:
429 ops = &packet_ops;
430 break;
431 case SOCK_DGRAM:
432 case SOCK_RDM:
433 ops = &msg_ops;
434 break;
435 default:
436 return -EPROTOTYPE;
437 }
438
439 /* Allocate socket's protocol area */
440 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
441 if (sk == NULL)
442 return -ENOMEM;
443
444 tsk = tipc_sk(sk);
445 tsk->max_pkt = MAX_PKT_DEFAULT;
446 INIT_LIST_HEAD(&tsk->publications);
447 INIT_LIST_HEAD(&tsk->cong_links);
448 msg = &tsk->phdr;
449 tn = net_generic(sock_net(sk), tipc_net_id);
450
451 /* Finish initializing socket data structures */
452 sock->ops = ops;
453 sock_init_data(sock, sk);
454 tipc_set_sk_state(sk, TIPC_OPEN);
455 if (tipc_sk_insert(tsk)) {
456 pr_warn("Socket create failed; port number exhausted\n");
457 return -EINVAL;
458 }
459
460 /* Ensure tsk is visible before we read own_addr. */
461 smp_mb();
462
463 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
464 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
465
466 msg_set_origport(msg, tsk->portid);
467 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
468 sk->sk_shutdown = 0;
469 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
470 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
471 sk->sk_data_ready = tipc_data_ready;
472 sk->sk_write_space = tipc_write_space;
473 sk->sk_destruct = tipc_sock_destruct;
474 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
475 tsk->group_is_open = true;
476 atomic_set(&tsk->dupl_rcvcnt, 0);
477
478 /* Start out with safe limits until we receive an advertised window */
479 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
480 tsk->rcv_win = tsk->snd_win;
481
482 if (tipc_sk_type_connectionless(sk)) {
483 tsk_set_unreturnable(tsk, true);
484 if (sock->type == SOCK_DGRAM)
485 tsk_set_unreliable(tsk, true);
486 }
487
488 return 0;
489}
490
491static void tipc_sk_callback(struct rcu_head *head)
492{
493 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
494
495 sock_put(&tsk->sk);
496}
497
498/* Caller should hold socket lock for the socket. */
499static void __tipc_shutdown(struct socket *sock, int error)
500{
501 struct sock *sk = sock->sk;
502 struct tipc_sock *tsk = tipc_sk(sk);
503 struct net *net = sock_net(sk);
504 long timeout = CONN_TIMEOUT_DEFAULT;
505 u32 dnode = tsk_peer_node(tsk);
506 struct sk_buff *skb;
507
508 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
509 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
510 !tsk_conn_cong(tsk)));
511
512 /* Reject all unreceived messages, except on an active connection
513 * (which disconnects locally & sends a 'FIN+' to peer).
514 */
515 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
516 if (TIPC_SKB_CB(skb)->bytes_read) {
517 kfree_skb(skb);
518 continue;
519 }
520 if (!tipc_sk_type_connectionless(sk) &&
521 sk->sk_state != TIPC_DISCONNECTING) {
522 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
523 tipc_node_remove_conn(net, dnode, tsk->portid);
524 }
525 tipc_sk_respond(sk, skb, error);
526 }
527
528 if (tipc_sk_type_connectionless(sk))
529 return;
530
531 if (sk->sk_state != TIPC_DISCONNECTING) {
532 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
533 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
534 tsk_own_node(tsk), tsk_peer_port(tsk),
535 tsk->portid, error);
536 if (skb)
537 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
538 tipc_node_remove_conn(net, dnode, tsk->portid);
539 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
540 }
541}
542
543/**
544 * tipc_release - destroy a TIPC socket
545 * @sock: socket to destroy
546 *
547 * This routine cleans up any messages that are still queued on the socket.
548 * For DGRAM and RDM socket types, all queued messages are rejected.
549 * For SEQPACKET and STREAM socket types, the first message is rejected
550 * and any others are discarded. (If the first message on a STREAM socket
551 * is partially-read, it is discarded and the next one is rejected instead.)
552 *
553 * NOTE: Rejected messages are not necessarily returned to the sender! They
554 * are returned or discarded according to the "destination droppable" setting
555 * specified for the message by the sender.
556 *
557 * Returns 0 on success, errno otherwise
558 */
559static int tipc_release(struct socket *sock)
560{
561 struct sock *sk = sock->sk;
562 struct tipc_sock *tsk;
563
564 /*
565 * Exit if socket isn't fully initialized (occurs when a failed accept()
566 * releases a pre-allocated child socket that was never used)
567 */
568 if (sk == NULL)
569 return 0;
570
571 tsk = tipc_sk(sk);
572 lock_sock(sk);
573
574 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
575 sk->sk_shutdown = SHUTDOWN_MASK;
576 tipc_sk_leave(tsk);
577 tipc_sk_withdraw(tsk, 0, NULL);
578 sk_stop_timer(sk, &sk->sk_timer);
579 tipc_sk_remove(tsk);
580
581 /* Reject any messages that accumulated in backlog queue */
582 release_sock(sk);
583 tipc_dest_list_purge(&tsk->cong_links);
584 tsk->cong_link_cnt = 0;
585 call_rcu(&tsk->rcu, tipc_sk_callback);
586 sock->sk = NULL;
587
588 return 0;
589}
590
591/**
592 * tipc_bind - associate or disassocate TIPC name(s) with a socket
593 * @sock: socket structure
594 * @uaddr: socket address describing name(s) and desired operation
595 * @uaddr_len: size of socket address data structure
596 *
597 * Name and name sequence binding is indicated using a positive scope value;
598 * a negative scope value unbinds the specified name. Specifying no name
599 * (i.e. a socket address length of 0) unbinds all names from the socket.
600 *
601 * Returns 0 on success, errno otherwise
602 *
603 * NOTE: This routine doesn't need to take the socket lock since it doesn't
604 * access any non-constant socket information.
605 */
606static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
607 int uaddr_len)
608{
609 struct sock *sk = sock->sk;
610 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
611 struct tipc_sock *tsk = tipc_sk(sk);
612 int res = -EINVAL;
613
614 lock_sock(sk);
615 if (unlikely(!uaddr_len)) {
616 res = tipc_sk_withdraw(tsk, 0, NULL);
617 goto exit;
618 }
619 if (tsk->group) {
620 res = -EACCES;
621 goto exit;
622 }
623 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
624 res = -EINVAL;
625 goto exit;
626 }
627 if (addr->family != AF_TIPC) {
628 res = -EAFNOSUPPORT;
629 goto exit;
630 }
631
632 if (addr->addrtype == TIPC_ADDR_NAME)
633 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
634 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
635 res = -EAFNOSUPPORT;
636 goto exit;
637 }
638
639 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
640 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
641 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
642 res = -EACCES;
643 goto exit;
644 }
645
646 res = (addr->scope >= 0) ?
647 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
648 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
649exit:
650 release_sock(sk);
651 return res;
652}
653
654/**
655 * tipc_getname - get port ID of socket or peer socket
656 * @sock: socket structure
657 * @uaddr: area for returned socket address
658 * @uaddr_len: area for returned length of socket address
659 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
660 *
661 * Returns 0 on success, errno otherwise
662 *
663 * NOTE: This routine doesn't need to take the socket lock since it only
664 * accesses socket information that is unchanging (or which changes in
665 * a completely predictable manner).
666 */
667static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
668 int peer)
669{
670 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
671 struct sock *sk = sock->sk;
672 struct tipc_sock *tsk = tipc_sk(sk);
673
674 memset(addr, 0, sizeof(*addr));
675 if (peer) {
676 if ((!tipc_sk_connected(sk)) &&
677 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
678 return -ENOTCONN;
679 addr->addr.id.ref = tsk_peer_port(tsk);
680 addr->addr.id.node = tsk_peer_node(tsk);
681 } else {
682 addr->addr.id.ref = tsk->portid;
683 addr->addr.id.node = tipc_own_addr(sock_net(sk));
684 }
685
686 addr->addrtype = TIPC_ADDR_ID;
687 addr->family = AF_TIPC;
688 addr->scope = 0;
689 addr->addr.name.domain = 0;
690
691 return sizeof(*addr);
692}
693
694/**
695 * tipc_poll - read and possibly block on pollmask
696 * @file: file structure associated with the socket
697 * @sock: socket for which to calculate the poll bits
698 * @wait: ???
699 *
700 * Returns pollmask value
701 *
702 * COMMENTARY:
703 * It appears that the usual socket locking mechanisms are not useful here
704 * since the pollmask info is potentially out-of-date the moment this routine
705 * exits. TCP and other protocols seem to rely on higher level poll routines
706 * to handle any preventable race conditions, so TIPC will do the same ...
707 *
708 * IMPORTANT: The fact that a read or write operation is indicated does NOT
709 * imply that the operation will succeed, merely that it should be performed
710 * and will not block.
711 */
712static __poll_t tipc_poll(struct file *file, struct socket *sock,
713 poll_table *wait)
714{
715 struct sock *sk = sock->sk;
716 struct tipc_sock *tsk = tipc_sk(sk);
717 __poll_t revents = 0;
718
719 sock_poll_wait(file, sk_sleep(sk), wait);
720
721 if (sk->sk_shutdown & RCV_SHUTDOWN)
722 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
723 if (sk->sk_shutdown == SHUTDOWN_MASK)
724 revents |= EPOLLHUP;
725
726 switch (sk->sk_state) {
727 case TIPC_ESTABLISHED:
728 case TIPC_CONNECTING:
729 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
730 revents |= EPOLLOUT;
731 /* fall thru' */
732 case TIPC_LISTEN:
733 if (!skb_queue_empty(&sk->sk_receive_queue))
734 revents |= EPOLLIN | EPOLLRDNORM;
735 break;
736 case TIPC_OPEN:
737 if (tsk->group_is_open && !tsk->cong_link_cnt)
738 revents |= EPOLLOUT;
739 if (!tipc_sk_type_connectionless(sk))
740 break;
741 if (skb_queue_empty(&sk->sk_receive_queue))
742 break;
743 revents |= EPOLLIN | EPOLLRDNORM;
744 break;
745 case TIPC_DISCONNECTING:
746 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
747 break;
748 }
749 return revents;
750}
751
752/**
753 * tipc_sendmcast - send multicast message
754 * @sock: socket structure
755 * @seq: destination address
756 * @msg: message to send
757 * @dlen: length of data to send
758 * @timeout: timeout to wait for wakeup
759 *
760 * Called from function tipc_sendmsg(), which has done all sanity checks
761 * Returns the number of bytes sent on success, or errno
762 */
763static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
764 struct msghdr *msg, size_t dlen, long timeout)
765{
766 struct sock *sk = sock->sk;
767 struct tipc_sock *tsk = tipc_sk(sk);
768 struct tipc_msg *hdr = &tsk->phdr;
769 struct net *net = sock_net(sk);
770 int mtu = tipc_bcast_get_mtu(net);
771 struct tipc_mc_method *method = &tsk->mc_method;
772 struct sk_buff_head pkts;
773 struct tipc_nlist dsts;
774 int rc;
775
776 if (tsk->group)
777 return -EACCES;
778
779 /* Block or return if any destination link is congested */
780 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
781 if (unlikely(rc))
782 return rc;
783
784 /* Lookup destination nodes */
785 tipc_nlist_init(&dsts, tipc_own_addr(net));
786 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
787 seq->upper, &dsts);
788 if (!dsts.local && !dsts.remote)
789 return -EHOSTUNREACH;
790
791 /* Build message header */
792 msg_set_type(hdr, TIPC_MCAST_MSG);
793 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
794 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
795 msg_set_destport(hdr, 0);
796 msg_set_destnode(hdr, 0);
797 msg_set_nametype(hdr, seq->type);
798 msg_set_namelower(hdr, seq->lower);
799 msg_set_nameupper(hdr, seq->upper);
800
801 /* Build message as chain of buffers */
802 skb_queue_head_init(&pkts);
803 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
804
805 /* Send message if build was successful */
806 if (unlikely(rc == dlen))
807 rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
808 &tsk->cong_link_cnt);
809
810 tipc_nlist_purge(&dsts);
811
812 return rc ? rc : dlen;
813}
814
815/**
816 * tipc_send_group_msg - send a message to a member in the group
817 * @net: network namespace
818 * @m: message to send
819 * @mb: group member
820 * @dnode: destination node
821 * @dport: destination port
822 * @dlen: total length of message data
823 */
824static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
825 struct msghdr *m, struct tipc_member *mb,
826 u32 dnode, u32 dport, int dlen)
827{
828 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
829 struct tipc_mc_method *method = &tsk->mc_method;
830 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
831 struct tipc_msg *hdr = &tsk->phdr;
832 struct sk_buff_head pkts;
833 int mtu, rc;
834
835 /* Complete message header */
836 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
837 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
838 msg_set_destport(hdr, dport);
839 msg_set_destnode(hdr, dnode);
840 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
841
842 /* Build message as chain of buffers */
843 skb_queue_head_init(&pkts);
844 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
845 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
846 if (unlikely(rc != dlen))
847 return rc;
848
849 /* Send message */
850 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
851 if (unlikely(rc == -ELINKCONG)) {
852 tipc_dest_push(&tsk->cong_links, dnode, 0);
853 tsk->cong_link_cnt++;
854 }
855
856 /* Update send window */
857 tipc_group_update_member(mb, blks);
858
859 /* A broadcast sent within next EXPIRE period must follow same path */
860 method->rcast = true;
861 method->mandatory = true;
862 return dlen;
863}
864
865/**
866 * tipc_send_group_unicast - send message to a member in the group
867 * @sock: socket structure
868 * @m: message to send
869 * @dlen: total length of message data
870 * @timeout: timeout to wait for wakeup
871 *
872 * Called from function tipc_sendmsg(), which has done all sanity checks
873 * Returns the number of bytes sent on success, or errno
874 */
875static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
876 int dlen, long timeout)
877{
878 struct sock *sk = sock->sk;
879 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
880 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
881 struct tipc_sock *tsk = tipc_sk(sk);
882 struct tipc_group *grp = tsk->group;
883 struct net *net = sock_net(sk);
884 struct tipc_member *mb = NULL;
885 u32 node, port;
886 int rc;
887
888 node = dest->addr.id.node;
889 port = dest->addr.id.ref;
890 if (!port && !node)
891 return -EHOSTUNREACH;
892
893 /* Block or return if destination link or member is congested */
894 rc = tipc_wait_for_cond(sock, &timeout,
895 !tipc_dest_find(&tsk->cong_links, node, 0) &&
896 !tipc_group_cong(grp, node, port, blks, &mb));
897 if (unlikely(rc))
898 return rc;
899
900 if (unlikely(!mb))
901 return -EHOSTUNREACH;
902
903 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
904
905 return rc ? rc : dlen;
906}
907
908/**
909 * tipc_send_group_anycast - send message to any member with given identity
910 * @sock: socket structure
911 * @m: message to send
912 * @dlen: total length of message data
913 * @timeout: timeout to wait for wakeup
914 *
915 * Called from function tipc_sendmsg(), which has done all sanity checks
916 * Returns the number of bytes sent on success, or errno
917 */
918static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
919 int dlen, long timeout)
920{
921 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
922 struct sock *sk = sock->sk;
923 struct tipc_sock *tsk = tipc_sk(sk);
924 struct list_head *cong_links = &tsk->cong_links;
925 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
926 struct tipc_group *grp = tsk->group;
927 struct tipc_msg *hdr = &tsk->phdr;
928 struct tipc_member *first = NULL;
929 struct tipc_member *mbr = NULL;
930 struct net *net = sock_net(sk);
931 u32 node, port, exclude;
932 struct list_head dsts;
933 u32 type, inst, scope;
934 int lookups = 0;
935 int dstcnt, rc;
936 bool cong;
937
938 INIT_LIST_HEAD(&dsts);
939
940 type = msg_nametype(hdr);
941 inst = dest->addr.name.name.instance;
942 scope = msg_lookup_scope(hdr);
943 exclude = tipc_group_exclude(grp);
944
945 while (++lookups < 4) {
946 first = NULL;
947
948 /* Look for a non-congested destination member, if any */
949 while (1) {
950 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
951 &dstcnt, exclude, false))
952 return -EHOSTUNREACH;
953 tipc_dest_pop(&dsts, &node, &port);
954 cong = tipc_group_cong(grp, node, port, blks, &mbr);
955 if (!cong)
956 break;
957 if (mbr == first)
958 break;
959 if (!first)
960 first = mbr;
961 }
962
963 /* Start over if destination was not in member list */
964 if (unlikely(!mbr))
965 continue;
966
967 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
968 break;
969
970 /* Block or return if destination link or member is congested */
971 rc = tipc_wait_for_cond(sock, &timeout,
972 !tipc_dest_find(cong_links, node, 0) &&
973 !tipc_group_cong(grp, node, port,
974 blks, &mbr));
975 if (unlikely(rc))
976 return rc;
977
978 /* Send, unless destination disappeared while waiting */
979 if (likely(mbr))
980 break;
981 }
982
983 if (unlikely(lookups >= 4))
984 return -EHOSTUNREACH;
985
986 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
987
988 return rc ? rc : dlen;
989}
990
991/**
992 * tipc_send_group_bcast - send message to all members in communication group
993 * @sk: socket structure
994 * @m: message to send
995 * @dlen: total length of message data
996 * @timeout: timeout to wait for wakeup
997 *
998 * Called from function tipc_sendmsg(), which has done all sanity checks
999 * Returns the number of bytes sent on success, or errno
1000 */
1001static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1002 int dlen, long timeout)
1003{
1004 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1005 struct sock *sk = sock->sk;
1006 struct net *net = sock_net(sk);
1007 struct tipc_sock *tsk = tipc_sk(sk);
1008 struct tipc_group *grp = tsk->group;
1009 struct tipc_nlist *dsts = tipc_group_dests(grp);
1010 struct tipc_mc_method *method = &tsk->mc_method;
1011 bool ack = method->mandatory && method->rcast;
1012 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1013 struct tipc_msg *hdr = &tsk->phdr;
1014 int mtu = tipc_bcast_get_mtu(net);
1015 struct sk_buff_head pkts;
1016 int rc = -EHOSTUNREACH;
1017
1018 if (!dsts->local && !dsts->remote)
1019 return -EHOSTUNREACH;
1020
1021 /* Block or return if any destination link or member is congested */
1022 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt &&
1023 !tipc_group_bc_cong(grp, blks));
1024 if (unlikely(rc))
1025 return rc;
1026
1027 /* Complete message header */
1028 if (dest) {
1029 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1030 msg_set_nameinst(hdr, dest->addr.name.name.instance);
1031 } else {
1032 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1033 msg_set_nameinst(hdr, 0);
1034 }
1035 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1036 msg_set_destport(hdr, 0);
1037 msg_set_destnode(hdr, 0);
1038 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(grp));
1039
1040 /* Avoid getting stuck with repeated forced replicasts */
1041 msg_set_grp_bc_ack_req(hdr, ack);
1042
1043 /* Build message as chain of buffers */
1044 skb_queue_head_init(&pkts);
1045 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1046 if (unlikely(rc != dlen))
1047 return rc;
1048
1049 /* Send message */
1050 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1051 if (unlikely(rc))
1052 return rc;
1053
1054 /* Update broadcast sequence number and send windows */
1055 tipc_group_update_bc_members(tsk->group, blks, ack);
1056
1057 /* Broadcast link is now free to choose method for next broadcast */
1058 method->mandatory = false;
1059 method->expires = jiffies;
1060
1061 return dlen;
1062}
1063
1064/**
1065 * tipc_send_group_mcast - send message to all members with given identity
1066 * @sock: socket structure
1067 * @m: message to send
1068 * @dlen: total length of message data
1069 * @timeout: timeout to wait for wakeup
1070 *
1071 * Called from function tipc_sendmsg(), which has done all sanity checks
1072 * Returns the number of bytes sent on success, or errno
1073 */
1074static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1075 int dlen, long timeout)
1076{
1077 struct sock *sk = sock->sk;
1078 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1079 struct tipc_sock *tsk = tipc_sk(sk);
1080 struct tipc_group *grp = tsk->group;
1081 struct tipc_msg *hdr = &tsk->phdr;
1082 struct net *net = sock_net(sk);
1083 u32 type, inst, scope, exclude;
1084 struct list_head dsts;
1085 u32 dstcnt;
1086
1087 INIT_LIST_HEAD(&dsts);
1088
1089 type = msg_nametype(hdr);
1090 inst = dest->addr.name.name.instance;
1091 scope = msg_lookup_scope(hdr);
1092 exclude = tipc_group_exclude(grp);
1093
1094 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
1095 &dstcnt, exclude, true))
1096 return -EHOSTUNREACH;
1097
1098 if (dstcnt == 1) {
1099 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
1100 return tipc_send_group_unicast(sock, m, dlen, timeout);
1101 }
1102
1103 tipc_dest_list_purge(&dsts);
1104 return tipc_send_group_bcast(sock, m, dlen, timeout);
1105}
1106
1107/**
1108 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1109 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1110 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1111 *
1112 * Multi-threaded: parallel calls with reference to same queues may occur
1113 */
1114void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1115 struct sk_buff_head *inputq)
1116{
1117 u32 self = tipc_own_addr(net);
1118 u32 type, lower, upper, scope;
1119 struct sk_buff *skb, *_skb;
1120 u32 portid, oport, onode;
1121 struct sk_buff_head tmpq;
1122 struct list_head dports;
1123 struct tipc_msg *hdr;
1124 int user, mtyp, hlen;
1125 bool exact;
1126
1127 __skb_queue_head_init(&tmpq);
1128 INIT_LIST_HEAD(&dports);
1129
1130 skb = tipc_skb_peek(arrvq, &inputq->lock);
1131 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1132 hdr = buf_msg(skb);
1133 user = msg_user(hdr);
1134 mtyp = msg_type(hdr);
1135 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1136 oport = msg_origport(hdr);
1137 onode = msg_orignode(hdr);
1138 type = msg_nametype(hdr);
1139
1140 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1141 spin_lock_bh(&inputq->lock);
1142 if (skb_peek(arrvq) == skb) {
1143 __skb_dequeue(arrvq);
1144 __skb_queue_tail(inputq, skb);
1145 }
1146 kfree_skb(skb);
1147 spin_unlock_bh(&inputq->lock);
1148 continue;
1149 }
1150
1151 /* Group messages require exact scope match */
1152 if (msg_in_group(hdr)) {
1153 lower = 0;
1154 upper = ~0;
1155 scope = msg_lookup_scope(hdr);
1156 exact = true;
1157 } else {
1158 /* TIPC_NODE_SCOPE means "any scope" in this context */
1159 if (onode == self)
1160 scope = TIPC_NODE_SCOPE;
1161 else
1162 scope = TIPC_CLUSTER_SCOPE;
1163 exact = false;
1164 lower = msg_namelower(hdr);
1165 upper = msg_nameupper(hdr);
1166 }
1167
1168 /* Create destination port list: */
1169 tipc_nametbl_mc_lookup(net, type, lower, upper,
1170 scope, exact, &dports);
1171
1172 /* Clone message per destination */
1173 while (tipc_dest_pop(&dports, NULL, &portid)) {
1174 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1175 if (_skb) {
1176 msg_set_destport(buf_msg(_skb), portid);
1177 __skb_queue_tail(&tmpq, _skb);
1178 continue;
1179 }
1180 pr_warn("Failed to clone mcast rcv buffer\n");
1181 }
1182 /* Append to inputq if not already done by other thread */
1183 spin_lock_bh(&inputq->lock);
1184 if (skb_peek(arrvq) == skb) {
1185 skb_queue_splice_tail_init(&tmpq, inputq);
1186 kfree_skb(__skb_dequeue(arrvq));
1187 }
1188 spin_unlock_bh(&inputq->lock);
1189 __skb_queue_purge(&tmpq);
1190 kfree_skb(skb);
1191 }
1192 tipc_sk_rcv(net, inputq);
1193}
1194
1195/**
1196 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1197 * @tsk: receiving socket
1198 * @skb: pointer to message buffer.
1199 */
1200static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1201 struct sk_buff_head *xmitq)
1202{
1203 struct tipc_msg *hdr = buf_msg(skb);
1204 u32 onode = tsk_own_node(tsk);
1205 struct sock *sk = &tsk->sk;
1206 int mtyp = msg_type(hdr);
1207 bool conn_cong;
1208
1209 /* Ignore if connection cannot be validated: */
1210 if (!tsk_peer_msg(tsk, hdr))
1211 goto exit;
1212
1213 if (unlikely(msg_errcode(hdr))) {
1214 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1215 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1216 tsk_peer_port(tsk));
1217 sk->sk_state_change(sk);
1218 goto exit;
1219 }
1220
1221 tsk->probe_unacked = false;
1222
1223 if (mtyp == CONN_PROBE) {
1224 msg_set_type(hdr, CONN_PROBE_REPLY);
1225 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1226 __skb_queue_tail(xmitq, skb);
1227 return;
1228 } else if (mtyp == CONN_ACK) {
1229 conn_cong = tsk_conn_cong(tsk);
1230 tsk->snt_unacked -= msg_conn_ack(hdr);
1231 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1232 tsk->snd_win = msg_adv_win(hdr);
1233 if (conn_cong)
1234 sk->sk_write_space(sk);
1235 } else if (mtyp != CONN_PROBE_REPLY) {
1236 pr_warn("Received unknown CONN_PROTO msg\n");
1237 }
1238exit:
1239 kfree_skb(skb);
1240}
1241
1242/**
1243 * tipc_sendmsg - send message in connectionless manner
1244 * @sock: socket structure
1245 * @m: message to send
1246 * @dsz: amount of user data to be sent
1247 *
1248 * Message must have an destination specified explicitly.
1249 * Used for SOCK_RDM and SOCK_DGRAM messages,
1250 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1251 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1252 *
1253 * Returns the number of bytes sent on success, or errno otherwise
1254 */
1255static int tipc_sendmsg(struct socket *sock,
1256 struct msghdr *m, size_t dsz)
1257{
1258 struct sock *sk = sock->sk;
1259 int ret;
1260
1261 lock_sock(sk);
1262 ret = __tipc_sendmsg(sock, m, dsz);
1263 release_sock(sk);
1264
1265 return ret;
1266}
1267
1268static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1269{
1270 struct sock *sk = sock->sk;
1271 struct net *net = sock_net(sk);
1272 struct tipc_sock *tsk = tipc_sk(sk);
1273 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1274 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1275 struct list_head *clinks = &tsk->cong_links;
1276 bool syn = !tipc_sk_type_connectionless(sk);
1277 struct tipc_group *grp = tsk->group;
1278 struct tipc_msg *hdr = &tsk->phdr;
1279 struct tipc_name_seq *seq;
1280 struct sk_buff_head pkts;
1281 u32 dport, dnode = 0;
1282 u32 type, inst;
1283 int mtu, rc;
1284
1285 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1286 return -EMSGSIZE;
1287
1288 if (likely(dest)) {
1289 if (unlikely(m->msg_namelen < sizeof(*dest)))
1290 return -EINVAL;
1291 if (unlikely(dest->family != AF_TIPC))
1292 return -EINVAL;
1293 }
1294
1295 if (grp) {
1296 if (!dest)
1297 return tipc_send_group_bcast(sock, m, dlen, timeout);
1298 if (dest->addrtype == TIPC_ADDR_NAME)
1299 return tipc_send_group_anycast(sock, m, dlen, timeout);
1300 if (dest->addrtype == TIPC_ADDR_ID)
1301 return tipc_send_group_unicast(sock, m, dlen, timeout);
1302 if (dest->addrtype == TIPC_ADDR_MCAST)
1303 return tipc_send_group_mcast(sock, m, dlen, timeout);
1304 return -EINVAL;
1305 }
1306
1307 if (unlikely(!dest)) {
1308 dest = &tsk->peer;
1309 if (!syn || dest->family != AF_TIPC)
1310 return -EDESTADDRREQ;
1311 }
1312
1313 if (unlikely(syn)) {
1314 if (sk->sk_state == TIPC_LISTEN)
1315 return -EPIPE;
1316 if (sk->sk_state != TIPC_OPEN)
1317 return -EISCONN;
1318 if (tsk->published)
1319 return -EOPNOTSUPP;
1320 if (dest->addrtype == TIPC_ADDR_NAME) {
1321 tsk->conn_type = dest->addr.name.name.type;
1322 tsk->conn_instance = dest->addr.name.name.instance;
1323 }
1324 }
1325
1326 seq = &dest->addr.nameseq;
1327 if (dest->addrtype == TIPC_ADDR_MCAST)
1328 return tipc_sendmcast(sock, seq, m, dlen, timeout);
1329
1330 if (dest->addrtype == TIPC_ADDR_NAME) {
1331 type = dest->addr.name.name.type;
1332 inst = dest->addr.name.name.instance;
1333 dnode = dest->addr.name.domain;
1334 msg_set_type(hdr, TIPC_NAMED_MSG);
1335 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1336 msg_set_nametype(hdr, type);
1337 msg_set_nameinst(hdr, inst);
1338 msg_set_lookup_scope(hdr, tipc_node2scope(dnode));
1339 dport = tipc_nametbl_translate(net, type, inst, &dnode);
1340 msg_set_destnode(hdr, dnode);
1341 msg_set_destport(hdr, dport);
1342 if (unlikely(!dport && !dnode))
1343 return -EHOSTUNREACH;
1344 } else if (dest->addrtype == TIPC_ADDR_ID) {
1345 dnode = dest->addr.id.node;
1346 msg_set_type(hdr, TIPC_DIRECT_MSG);
1347 msg_set_lookup_scope(hdr, 0);
1348 msg_set_destnode(hdr, dnode);
1349 msg_set_destport(hdr, dest->addr.id.ref);
1350 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1351 } else {
1352 return -EINVAL;
1353 }
1354
1355 /* Block or return if destination link is congested */
1356 rc = tipc_wait_for_cond(sock, &timeout,
1357 !tipc_dest_find(clinks, dnode, 0));
1358 if (unlikely(rc))
1359 return rc;
1360
1361 skb_queue_head_init(&pkts);
1362 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
1363 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1364 if (unlikely(rc != dlen))
1365 return rc;
1366
1367 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1368 if (unlikely(rc == -ELINKCONG)) {
1369 tipc_dest_push(clinks, dnode, 0);
1370 tsk->cong_link_cnt++;
1371 rc = 0;
1372 }
1373
1374 if (unlikely(syn && !rc))
1375 tipc_set_sk_state(sk, TIPC_CONNECTING);
1376
1377 return rc ? rc : dlen;
1378}
1379
1380/**
1381 * tipc_sendstream - send stream-oriented data
1382 * @sock: socket structure
1383 * @m: data to send
1384 * @dsz: total length of data to be transmitted
1385 *
1386 * Used for SOCK_STREAM data.
1387 *
1388 * Returns the number of bytes sent on success (or partial success),
1389 * or errno if no data sent
1390 */
1391static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1392{
1393 struct sock *sk = sock->sk;
1394 int ret;
1395
1396 lock_sock(sk);
1397 ret = __tipc_sendstream(sock, m, dsz);
1398 release_sock(sk);
1399
1400 return ret;
1401}
1402
1403static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1404{
1405 struct sock *sk = sock->sk;
1406 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1407 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1408 struct tipc_sock *tsk = tipc_sk(sk);
1409 struct tipc_msg *hdr = &tsk->phdr;
1410 struct net *net = sock_net(sk);
1411 struct sk_buff_head pkts;
1412 u32 dnode = tsk_peer_node(tsk);
1413 int send, sent = 0;
1414 int rc = 0;
1415
1416 skb_queue_head_init(&pkts);
1417
1418 if (unlikely(dlen > INT_MAX))
1419 return -EMSGSIZE;
1420
1421 /* Handle implicit connection setup */
1422 if (unlikely(dest)) {
1423 rc = __tipc_sendmsg(sock, m, dlen);
1424 if (dlen && (dlen == rc))
1425 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1426 return rc;
1427 }
1428
1429 do {
1430 rc = tipc_wait_for_cond(sock, &timeout,
1431 (!tsk->cong_link_cnt &&
1432 !tsk_conn_cong(tsk) &&
1433 tipc_sk_connected(sk)));
1434 if (unlikely(rc))
1435 break;
1436
1437 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1438 rc = tipc_msg_build(hdr, m, sent, send, tsk->max_pkt, &pkts);
1439 if (unlikely(rc != send))
1440 break;
1441
1442 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1443 if (unlikely(rc == -ELINKCONG)) {
1444 tsk->cong_link_cnt = 1;
1445 rc = 0;
1446 }
1447 if (likely(!rc)) {
1448 tsk->snt_unacked += tsk_inc(tsk, send + MIN_H_SIZE);
1449 sent += send;
1450 }
1451 } while (sent < dlen && !rc);
1452
1453 return sent ? sent : rc;
1454}
1455
1456/**
1457 * tipc_send_packet - send a connection-oriented message
1458 * @sock: socket structure
1459 * @m: message to send
1460 * @dsz: length of data to be transmitted
1461 *
1462 * Used for SOCK_SEQPACKET messages.
1463 *
1464 * Returns the number of bytes sent on success, or errno otherwise
1465 */
1466static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1467{
1468 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1469 return -EMSGSIZE;
1470
1471 return tipc_sendstream(sock, m, dsz);
1472}
1473
1474/* tipc_sk_finish_conn - complete the setup of a connection
1475 */
1476static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1477 u32 peer_node)
1478{
1479 struct sock *sk = &tsk->sk;
1480 struct net *net = sock_net(sk);
1481 struct tipc_msg *msg = &tsk->phdr;
1482
1483 msg_set_destnode(msg, peer_node);
1484 msg_set_destport(msg, peer_port);
1485 msg_set_type(msg, TIPC_CONN_MSG);
1486 msg_set_lookup_scope(msg, 0);
1487 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1488
1489 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1490 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1491 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1492 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
1493 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1494 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1495 return;
1496
1497 /* Fall back to message based flow control */
1498 tsk->rcv_win = FLOWCTL_MSG_WIN;
1499 tsk->snd_win = FLOWCTL_MSG_WIN;
1500}
1501
1502/**
1503 * tipc_sk_set_orig_addr - capture sender's address for received message
1504 * @m: descriptor for message info
1505 * @hdr: received message header
1506 *
1507 * Note: Address is not captured if not requested by receiver.
1508 */
1509static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1510{
1511 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1512 struct tipc_msg *hdr = buf_msg(skb);
1513
1514 if (!srcaddr)
1515 return;
1516
1517 srcaddr->sock.family = AF_TIPC;
1518 srcaddr->sock.addrtype = TIPC_ADDR_ID;
1519 srcaddr->sock.scope = 0;
1520 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1521 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1522 srcaddr->sock.addr.name.domain = 0;
1523 m->msg_namelen = sizeof(struct sockaddr_tipc);
1524
1525 if (!msg_in_group(hdr))
1526 return;
1527
1528 /* Group message users may also want to know sending member's id */
1529 srcaddr->member.family = AF_TIPC;
1530 srcaddr->member.addrtype = TIPC_ADDR_NAME;
1531 srcaddr->member.scope = 0;
1532 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1533 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1534 srcaddr->member.addr.name.domain = 0;
1535 m->msg_namelen = sizeof(*srcaddr);
1536}
1537
1538/**
1539 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1540 * @m: descriptor for message info
1541 * @msg: received message header
1542 * @tsk: TIPC port associated with message
1543 *
1544 * Note: Ancillary data is not captured if not requested by receiver.
1545 *
1546 * Returns 0 if successful, otherwise errno
1547 */
1548static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1549 struct tipc_sock *tsk)
1550{
1551 u32 anc_data[3];
1552 u32 err;
1553 u32 dest_type;
1554 int has_name;
1555 int res;
1556
1557 if (likely(m->msg_controllen == 0))
1558 return 0;
1559
1560 /* Optionally capture errored message object(s) */
1561 err = msg ? msg_errcode(msg) : 0;
1562 if (unlikely(err)) {
1563 anc_data[0] = err;
1564 anc_data[1] = msg_data_sz(msg);
1565 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1566 if (res)
1567 return res;
1568 if (anc_data[1]) {
1569 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1570 msg_data(msg));
1571 if (res)
1572 return res;
1573 }
1574 }
1575
1576 /* Optionally capture message destination object */
1577 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1578 switch (dest_type) {
1579 case TIPC_NAMED_MSG:
1580 has_name = 1;
1581 anc_data[0] = msg_nametype(msg);
1582 anc_data[1] = msg_namelower(msg);
1583 anc_data[2] = msg_namelower(msg);
1584 break;
1585 case TIPC_MCAST_MSG:
1586 has_name = 1;
1587 anc_data[0] = msg_nametype(msg);
1588 anc_data[1] = msg_namelower(msg);
1589 anc_data[2] = msg_nameupper(msg);
1590 break;
1591 case TIPC_CONN_MSG:
1592 has_name = (tsk->conn_type != 0);
1593 anc_data[0] = tsk->conn_type;
1594 anc_data[1] = tsk->conn_instance;
1595 anc_data[2] = tsk->conn_instance;
1596 break;
1597 default:
1598 has_name = 0;
1599 }
1600 if (has_name) {
1601 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1602 if (res)
1603 return res;
1604 }
1605
1606 return 0;
1607}
1608
1609static void tipc_sk_send_ack(struct tipc_sock *tsk)
1610{
1611 struct sock *sk = &tsk->sk;
1612 struct net *net = sock_net(sk);
1613 struct sk_buff *skb = NULL;
1614 struct tipc_msg *msg;
1615 u32 peer_port = tsk_peer_port(tsk);
1616 u32 dnode = tsk_peer_node(tsk);
1617
1618 if (!tipc_sk_connected(sk))
1619 return;
1620 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1621 dnode, tsk_own_node(tsk), peer_port,
1622 tsk->portid, TIPC_OK);
1623 if (!skb)
1624 return;
1625 msg = buf_msg(skb);
1626 msg_set_conn_ack(msg, tsk->rcv_unacked);
1627 tsk->rcv_unacked = 0;
1628
1629 /* Adjust to and advertize the correct window limit */
1630 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1631 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1632 msg_set_adv_win(msg, tsk->rcv_win);
1633 }
1634 tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
1635}
1636
1637static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1638{
1639 struct sock *sk = sock->sk;
1640 DEFINE_WAIT(wait);
1641 long timeo = *timeop;
1642 int err = sock_error(sk);
1643
1644 if (err)
1645 return err;
1646
1647 for (;;) {
1648 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1649 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1650 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1651 err = -ENOTCONN;
1652 break;
1653 }
1654 release_sock(sk);
1655 timeo = schedule_timeout(timeo);
1656 lock_sock(sk);
1657 }
1658 err = 0;
1659 if (!skb_queue_empty(&sk->sk_receive_queue))
1660 break;
1661 err = -EAGAIN;
1662 if (!timeo)
1663 break;
1664 err = sock_intr_errno(timeo);
1665 if (signal_pending(current))
1666 break;
1667
1668 err = sock_error(sk);
1669 if (err)
1670 break;
1671 }
1672 finish_wait(sk_sleep(sk), &wait);
1673 *timeop = timeo;
1674 return err;
1675}
1676
1677/**
1678 * tipc_recvmsg - receive packet-oriented message
1679 * @m: descriptor for message info
1680 * @buflen: length of user buffer area
1681 * @flags: receive flags
1682 *
1683 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1684 * If the complete message doesn't fit in user area, truncate it.
1685 *
1686 * Returns size of returned message data, errno otherwise
1687 */
1688static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1689 size_t buflen, int flags)
1690{
1691 struct sock *sk = sock->sk;
1692 bool connected = !tipc_sk_type_connectionless(sk);
1693 struct tipc_sock *tsk = tipc_sk(sk);
1694 int rc, err, hlen, dlen, copy;
1695 struct sk_buff_head xmitq;
1696 struct tipc_msg *hdr;
1697 struct sk_buff *skb;
1698 bool grp_evt;
1699 long timeout;
1700
1701 /* Catch invalid receive requests */
1702 if (unlikely(!buflen))
1703 return -EINVAL;
1704
1705 lock_sock(sk);
1706 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1707 rc = -ENOTCONN;
1708 goto exit;
1709 }
1710 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1711
1712 /* Step rcv queue to first msg with data or error; wait if necessary */
1713 do {
1714 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1715 if (unlikely(rc))
1716 goto exit;
1717 skb = skb_peek(&sk->sk_receive_queue);
1718 hdr = buf_msg(skb);
1719 dlen = msg_data_sz(hdr);
1720 hlen = msg_hdr_sz(hdr);
1721 err = msg_errcode(hdr);
1722 grp_evt = msg_is_grp_evt(hdr);
1723 if (likely(dlen || err))
1724 break;
1725 tsk_advance_rx_queue(sk);
1726 } while (1);
1727
1728 /* Collect msg meta data, including error code and rejected data */
1729 tipc_sk_set_orig_addr(m, skb);
1730 rc = tipc_sk_anc_data_recv(m, hdr, tsk);
1731 if (unlikely(rc))
1732 goto exit;
1733
1734 /* Capture data if non-error msg, otherwise just set return value */
1735 if (likely(!err)) {
1736 copy = min_t(int, dlen, buflen);
1737 if (unlikely(copy != dlen))
1738 m->msg_flags |= MSG_TRUNC;
1739 rc = skb_copy_datagram_msg(skb, hlen, m, copy);
1740 } else {
1741 copy = 0;
1742 rc = 0;
1743 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
1744 rc = -ECONNRESET;
1745 }
1746 if (unlikely(rc))
1747 goto exit;
1748
1749 /* Mark message as group event if applicable */
1750 if (unlikely(grp_evt)) {
1751 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1752 m->msg_flags |= MSG_EOR;
1753 m->msg_flags |= MSG_OOB;
1754 copy = 0;
1755 }
1756
1757 /* Caption of data or error code/rejected data was successful */
1758 if (unlikely(flags & MSG_PEEK))
1759 goto exit;
1760
1761 /* Send group flow control advertisement when applicable */
1762 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1763 skb_queue_head_init(&xmitq);
1764 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1765 msg_orignode(hdr), msg_origport(hdr),
1766 &xmitq);
1767 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1768 }
1769
1770 tsk_advance_rx_queue(sk);
1771
1772 if (likely(!connected))
1773 goto exit;
1774
1775 /* Send connection flow control advertisement when applicable */
1776 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1777 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1778 tipc_sk_send_ack(tsk);
1779exit:
1780 release_sock(sk);
1781 return rc ? rc : copy;
1782}
1783
1784/**
1785 * tipc_recvstream - receive stream-oriented data
1786 * @m: descriptor for message info
1787 * @buflen: total size of user buffer area
1788 * @flags: receive flags
1789 *
1790 * Used for SOCK_STREAM messages only. If not enough data is available
1791 * will optionally wait for more; never truncates data.
1792 *
1793 * Returns size of returned message data, errno otherwise
1794 */
1795static int tipc_recvstream(struct socket *sock, struct msghdr *m,
1796 size_t buflen, int flags)
1797{
1798 struct sock *sk = sock->sk;
1799 struct tipc_sock *tsk = tipc_sk(sk);
1800 struct sk_buff *skb;
1801 struct tipc_msg *hdr;
1802 struct tipc_skb_cb *skb_cb;
1803 bool peek = flags & MSG_PEEK;
1804 int offset, required, copy, copied = 0;
1805 int hlen, dlen, err, rc;
1806 long timeout;
1807
1808 /* Catch invalid receive attempts */
1809 if (unlikely(!buflen))
1810 return -EINVAL;
1811
1812 lock_sock(sk);
1813
1814 if (unlikely(sk->sk_state == TIPC_OPEN)) {
1815 rc = -ENOTCONN;
1816 goto exit;
1817 }
1818 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
1819 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1820
1821 do {
1822 /* Look at first msg in receive queue; wait if necessary */
1823 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1824 if (unlikely(rc))
1825 break;
1826 skb = skb_peek(&sk->sk_receive_queue);
1827 skb_cb = TIPC_SKB_CB(skb);
1828 hdr = buf_msg(skb);
1829 dlen = msg_data_sz(hdr);
1830 hlen = msg_hdr_sz(hdr);
1831 err = msg_errcode(hdr);
1832
1833 /* Discard any empty non-errored (SYN-) message */
1834 if (unlikely(!dlen && !err)) {
1835 tsk_advance_rx_queue(sk);
1836 continue;
1837 }
1838
1839 /* Collect msg meta data, incl. error code and rejected data */
1840 if (!copied) {
1841 tipc_sk_set_orig_addr(m, skb);
1842 rc = tipc_sk_anc_data_recv(m, hdr, tsk);
1843 if (rc)
1844 break;
1845 }
1846
1847 /* Copy data if msg ok, otherwise return error/partial data */
1848 if (likely(!err)) {
1849 offset = skb_cb->bytes_read;
1850 copy = min_t(int, dlen - offset, buflen - copied);
1851 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1852 if (unlikely(rc))
1853 break;
1854 copied += copy;
1855 offset += copy;
1856 if (unlikely(offset < dlen)) {
1857 if (!peek)
1858 skb_cb->bytes_read = offset;
1859 break;
1860 }
1861 } else {
1862 rc = 0;
1863 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
1864 rc = -ECONNRESET;
1865 if (copied || rc)
1866 break;
1867 }
1868
1869 if (unlikely(peek))
1870 break;
1871
1872 tsk_advance_rx_queue(sk);
1873
1874 /* Send connection flow control advertisement when applicable */
1875 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1876 if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE))
1877 tipc_sk_send_ack(tsk);
1878
1879 /* Exit if all requested data or FIN/error received */
1880 if (copied == buflen || err)
1881 break;
1882
1883 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
1884exit:
1885 release_sock(sk);
1886 return copied ? copied : rc;
1887}
1888
1889/**
1890 * tipc_write_space - wake up thread if port congestion is released
1891 * @sk: socket
1892 */
1893static void tipc_write_space(struct sock *sk)
1894{
1895 struct socket_wq *wq;
1896
1897 rcu_read_lock();
1898 wq = rcu_dereference(sk->sk_wq);
1899 if (skwq_has_sleeper(wq))
1900 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
1901 EPOLLWRNORM | EPOLLWRBAND);
1902 rcu_read_unlock();
1903}
1904
1905/**
1906 * tipc_data_ready - wake up threads to indicate messages have been received
1907 * @sk: socket
1908 * @len: the length of messages
1909 */
1910static void tipc_data_ready(struct sock *sk)
1911{
1912 struct socket_wq *wq;
1913
1914 rcu_read_lock();
1915 wq = rcu_dereference(sk->sk_wq);
1916 if (skwq_has_sleeper(wq))
1917 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
1918 EPOLLRDNORM | EPOLLRDBAND);
1919 rcu_read_unlock();
1920}
1921
1922static void tipc_sock_destruct(struct sock *sk)
1923{
1924 __skb_queue_purge(&sk->sk_receive_queue);
1925}
1926
1927static void tipc_sk_proto_rcv(struct sock *sk,
1928 struct sk_buff_head *inputq,
1929 struct sk_buff_head *xmitq)
1930{
1931 struct sk_buff *skb = __skb_dequeue(inputq);
1932 struct tipc_sock *tsk = tipc_sk(sk);
1933 struct tipc_msg *hdr = buf_msg(skb);
1934 struct tipc_group *grp = tsk->group;
1935 bool wakeup = false;
1936
1937 switch (msg_user(hdr)) {
1938 case CONN_MANAGER:
1939 tipc_sk_conn_proto_rcv(tsk, skb, xmitq);
1940 return;
1941 case SOCK_WAKEUP:
1942 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
1943 tsk->cong_link_cnt--;
1944 wakeup = true;
1945 break;
1946 case GROUP_PROTOCOL:
1947 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
1948 break;
1949 case TOP_SRV:
1950 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
1951 hdr, inputq, xmitq);
1952 break;
1953 default:
1954 break;
1955 }
1956
1957 if (wakeup)
1958 sk->sk_write_space(sk);
1959
1960 kfree_skb(skb);
1961}
1962
1963/**
1964 * tipc_filter_connect - Handle incoming message for a connection-based socket
1965 * @tsk: TIPC socket
1966 * @skb: pointer to message buffer. Set to NULL if buffer is consumed
1967 *
1968 * Returns true if everything ok, false otherwise
1969 */
1970static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
1971{
1972 struct sock *sk = &tsk->sk;
1973 struct net *net = sock_net(sk);
1974 struct tipc_msg *hdr = buf_msg(skb);
1975 u32 pport = msg_origport(hdr);
1976 u32 pnode = msg_orignode(hdr);
1977
1978 if (unlikely(msg_mcast(hdr)))
1979 return false;
1980
1981 switch (sk->sk_state) {
1982 case TIPC_CONNECTING:
1983 /* Accept only ACK or NACK message */
1984 if (unlikely(!msg_connected(hdr))) {
1985 if (pport != tsk_peer_port(tsk) ||
1986 pnode != tsk_peer_node(tsk))
1987 return false;
1988
1989 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1990 sk->sk_err = ECONNREFUSED;
1991 sk->sk_state_change(sk);
1992 return true;
1993 }
1994
1995 if (unlikely(msg_errcode(hdr))) {
1996 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1997 sk->sk_err = ECONNREFUSED;
1998 sk->sk_state_change(sk);
1999 return true;
2000 }
2001
2002 if (unlikely(!msg_isdata(hdr))) {
2003 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2004 sk->sk_err = EINVAL;
2005 sk->sk_state_change(sk);
2006 return true;
2007 }
2008
2009 tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr));
2010 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2011
2012 /* If 'ACK+' message, add to socket receive queue */
2013 if (msg_data_sz(hdr))
2014 return true;
2015
2016 /* If empty 'ACK-' message, wake up sleeping connect() */
2017 sk->sk_data_ready(sk);
2018
2019 /* 'ACK-' message is neither accepted nor rejected: */
2020 msg_set_dest_droppable(hdr, 1);
2021 return false;
2022
2023 case TIPC_OPEN:
2024 case TIPC_DISCONNECTING:
2025 break;
2026 case TIPC_LISTEN:
2027 /* Accept only SYN message */
2028 if (!msg_connected(hdr) && !(msg_errcode(hdr)))
2029 return true;
2030 break;
2031 case TIPC_ESTABLISHED:
2032 /* Accept only connection-based messages sent by peer */
2033 if (unlikely(!tsk_peer_msg(tsk, hdr)))
2034 return false;
2035
2036 if (unlikely(msg_errcode(hdr))) {
2037 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2038 /* Let timer expire on it's own */
2039 tipc_node_remove_conn(net, tsk_peer_node(tsk),
2040 tsk->portid);
2041 sk->sk_state_change(sk);
2042 }
2043 return true;
2044 default:
2045 pr_err("Unknown sk_state %u\n", sk->sk_state);
2046 }
2047
2048 return false;
2049}
2050
2051/**
2052 * rcvbuf_limit - get proper overload limit of socket receive queue
2053 * @sk: socket
2054 * @skb: message
2055 *
2056 * For connection oriented messages, irrespective of importance,
2057 * default queue limit is 2 MB.
2058 *
2059 * For connectionless messages, queue limits are based on message
2060 * importance as follows:
2061 *
2062 * TIPC_LOW_IMPORTANCE (2 MB)
2063 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2064 * TIPC_HIGH_IMPORTANCE (8 MB)
2065 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2066 *
2067 * Returns overload limit according to corresponding message importance
2068 */
2069static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2070{
2071 struct tipc_sock *tsk = tipc_sk(sk);
2072 struct tipc_msg *hdr = buf_msg(skb);
2073
2074 if (unlikely(msg_in_group(hdr)))
2075 return sk->sk_rcvbuf;
2076
2077 if (unlikely(!msg_connected(hdr)))
2078 return sk->sk_rcvbuf << msg_importance(hdr);
2079
2080 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2081 return sk->sk_rcvbuf;
2082
2083 return FLOWCTL_MSG_LIM;
2084}
2085
2086/**
2087 * tipc_sk_filter_rcv - validate incoming message
2088 * @sk: socket
2089 * @skb: pointer to message.
2090 *
2091 * Enqueues message on receive queue if acceptable; optionally handles
2092 * disconnect indication for a connected socket.
2093 *
2094 * Called with socket lock already taken
2095 *
2096 */
2097static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2098 struct sk_buff_head *xmitq)
2099{
2100 bool sk_conn = !tipc_sk_type_connectionless(sk);
2101 struct tipc_sock *tsk = tipc_sk(sk);
2102 struct tipc_group *grp = tsk->group;
2103 struct tipc_msg *hdr = buf_msg(skb);
2104 struct net *net = sock_net(sk);
2105 struct sk_buff_head inputq;
2106 int limit, err = TIPC_OK;
2107
2108 TIPC_SKB_CB(skb)->bytes_read = 0;
2109 __skb_queue_head_init(&inputq);
2110 __skb_queue_tail(&inputq, skb);
2111
2112 if (unlikely(!msg_isdata(hdr)))
2113 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2114
2115 if (unlikely(grp))
2116 tipc_group_filter_msg(grp, &inputq, xmitq);
2117
2118 /* Validate and add to receive buffer if there is space */
2119 while ((skb = __skb_dequeue(&inputq))) {
2120 hdr = buf_msg(skb);
2121 limit = rcvbuf_limit(sk, skb);
2122 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) ||
2123 (!sk_conn && msg_connected(hdr)) ||
2124 (!grp && msg_in_group(hdr)))
2125 err = TIPC_ERR_NO_PORT;
2126 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2127 atomic_inc(&sk->sk_drops);
2128 err = TIPC_ERR_OVERLOAD;
2129 }
2130
2131 if (unlikely(err)) {
2132 tipc_skb_reject(net, err, skb, xmitq);
2133 err = TIPC_OK;
2134 continue;
2135 }
2136 __skb_queue_tail(&sk->sk_receive_queue, skb);
2137 skb_set_owner_r(skb, sk);
2138 sk->sk_data_ready(sk);
2139 }
2140}
2141
2142/**
2143 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2144 * @sk: socket
2145 * @skb: message
2146 *
2147 * Caller must hold socket lock
2148 */
2149static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2150{
2151 unsigned int before = sk_rmem_alloc_get(sk);
2152 struct sk_buff_head xmitq;
2153 unsigned int added;
2154
2155 __skb_queue_head_init(&xmitq);
2156
2157 tipc_sk_filter_rcv(sk, skb, &xmitq);
2158 added = sk_rmem_alloc_get(sk) - before;
2159 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2160
2161 /* Send pending response/rejected messages, if any */
2162 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2163 return 0;
2164}
2165
2166/**
2167 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2168 * inputq and try adding them to socket or backlog queue
2169 * @inputq: list of incoming buffers with potentially different destinations
2170 * @sk: socket where the buffers should be enqueued
2171 * @dport: port number for the socket
2172 *
2173 * Caller must hold socket lock
2174 */
2175static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2176 u32 dport, struct sk_buff_head *xmitq)
2177{
2178 unsigned long time_limit = jiffies + 2;
2179 struct sk_buff *skb;
2180 unsigned int lim;
2181 atomic_t *dcnt;
2182 u32 onode;
2183
2184 while (skb_queue_len(inputq)) {
2185 if (unlikely(time_after_eq(jiffies, time_limit)))
2186 return;
2187
2188 skb = tipc_skb_dequeue(inputq, dport);
2189 if (unlikely(!skb))
2190 return;
2191
2192 /* Add message directly to receive queue if possible */
2193 if (!sock_owned_by_user(sk)) {
2194 tipc_sk_filter_rcv(sk, skb, xmitq);
2195 continue;
2196 }
2197
2198 /* Try backlog, compensating for double-counted bytes */
2199 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2200 if (!sk->sk_backlog.len)
2201 atomic_set(dcnt, 0);
2202 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2203 if (likely(!sk_add_backlog(sk, skb, lim)))
2204 continue;
2205
2206 /* Overload => reject message back to sender */
2207 onode = tipc_own_addr(sock_net(sk));
2208 atomic_inc(&sk->sk_drops);
2209 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD))
2210 __skb_queue_tail(xmitq, skb);
2211 break;
2212 }
2213}
2214
2215/**
2216 * tipc_sk_rcv - handle a chain of incoming buffers
2217 * @inputq: buffer list containing the buffers
2218 * Consumes all buffers in list until inputq is empty
2219 * Note: may be called in multiple threads referring to the same queue
2220 */
2221void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2222{
2223 struct sk_buff_head xmitq;
2224 u32 dnode, dport = 0;
2225 int err;
2226 struct tipc_sock *tsk;
2227 struct sock *sk;
2228 struct sk_buff *skb;
2229
2230 __skb_queue_head_init(&xmitq);
2231 while (skb_queue_len(inputq)) {
2232 dport = tipc_skb_peek_port(inputq, dport);
2233 tsk = tipc_sk_lookup(net, dport);
2234
2235 if (likely(tsk)) {
2236 sk = &tsk->sk;
2237 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2238 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2239 spin_unlock_bh(&sk->sk_lock.slock);
2240 }
2241 /* Send pending response/rejected messages, if any */
2242 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2243 sock_put(sk);
2244 continue;
2245 }
2246 /* No destination socket => dequeue skb if still there */
2247 skb = tipc_skb_dequeue(inputq, dport);
2248 if (!skb)
2249 return;
2250
2251 /* Try secondary lookup if unresolved named message */
2252 err = TIPC_ERR_NO_PORT;
2253 if (tipc_msg_lookup_dest(net, skb, &err))
2254 goto xmit;
2255
2256 /* Prepare for message rejection */
2257 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2258 continue;
2259xmit:
2260 dnode = msg_destnode(buf_msg(skb));
2261 tipc_node_xmit_skb(net, skb, dnode, dport);
2262 }
2263}
2264
2265static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2266{
2267 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2268 struct sock *sk = sock->sk;
2269 int done;
2270
2271 do {
2272 int err = sock_error(sk);
2273 if (err)
2274 return err;
2275 if (!*timeo_p)
2276 return -ETIMEDOUT;
2277 if (signal_pending(current))
2278 return sock_intr_errno(*timeo_p);
2279
2280 add_wait_queue(sk_sleep(sk), &wait);
2281 done = sk_wait_event(sk, timeo_p,
2282 sk->sk_state != TIPC_CONNECTING, &wait);
2283 remove_wait_queue(sk_sleep(sk), &wait);
2284 } while (!done);
2285 return 0;
2286}
2287
2288/**
2289 * tipc_connect - establish a connection to another TIPC port
2290 * @sock: socket structure
2291 * @dest: socket address for destination port
2292 * @destlen: size of socket address data structure
2293 * @flags: file-related flags associated with socket
2294 *
2295 * Returns 0 on success, errno otherwise
2296 */
2297static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2298 int destlen, int flags)
2299{
2300 struct sock *sk = sock->sk;
2301 struct tipc_sock *tsk = tipc_sk(sk);
2302 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2303 struct msghdr m = {NULL,};
2304 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2305 int previous;
2306 int res = 0;
2307
2308 if (destlen != sizeof(struct sockaddr_tipc))
2309 return -EINVAL;
2310
2311 lock_sock(sk);
2312
2313 if (tsk->group) {
2314 res = -EINVAL;
2315 goto exit;
2316 }
2317
2318 if (dst->family == AF_UNSPEC) {
2319 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2320 if (!tipc_sk_type_connectionless(sk))
2321 res = -EINVAL;
2322 goto exit;
2323 } else if (dst->family != AF_TIPC) {
2324 res = -EINVAL;
2325 }
2326 if (dst->addrtype != TIPC_ADDR_ID && dst->addrtype != TIPC_ADDR_NAME)
2327 res = -EINVAL;
2328 if (res)
2329 goto exit;
2330
2331 /* DGRAM/RDM connect(), just save the destaddr */
2332 if (tipc_sk_type_connectionless(sk)) {
2333 memcpy(&tsk->peer, dest, destlen);
2334 goto exit;
2335 }
2336
2337 previous = sk->sk_state;
2338
2339 switch (sk->sk_state) {
2340 case TIPC_OPEN:
2341 /* Send a 'SYN-' to destination */
2342 m.msg_name = dest;
2343 m.msg_namelen = destlen;
2344
2345 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2346 * indicate send_msg() is never blocked.
2347 */
2348 if (!timeout)
2349 m.msg_flags = MSG_DONTWAIT;
2350
2351 res = __tipc_sendmsg(sock, &m, 0);
2352 if ((res < 0) && (res != -EWOULDBLOCK))
2353 goto exit;
2354
2355 /* Just entered TIPC_CONNECTING state; the only
2356 * difference is that return value in non-blocking
2357 * case is EINPROGRESS, rather than EALREADY.
2358 */
2359 res = -EINPROGRESS;
2360 /* fall thru' */
2361 case TIPC_CONNECTING:
2362 if (!timeout) {
2363 if (previous == TIPC_CONNECTING)
2364 res = -EALREADY;
2365 goto exit;
2366 }
2367 timeout = msecs_to_jiffies(timeout);
2368 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2369 res = tipc_wait_for_connect(sock, &timeout);
2370 break;
2371 case TIPC_ESTABLISHED:
2372 res = -EISCONN;
2373 break;
2374 default:
2375 res = -EINVAL;
2376 }
2377
2378exit:
2379 release_sock(sk);
2380 return res;
2381}
2382
2383/**
2384 * tipc_listen - allow socket to listen for incoming connections
2385 * @sock: socket structure
2386 * @len: (unused)
2387 *
2388 * Returns 0 on success, errno otherwise
2389 */
2390static int tipc_listen(struct socket *sock, int len)
2391{
2392 struct sock *sk = sock->sk;
2393 int res;
2394
2395 lock_sock(sk);
2396 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2397 release_sock(sk);
2398
2399 return res;
2400}
2401
2402static int tipc_wait_for_accept(struct socket *sock, long timeo)
2403{
2404 struct sock *sk = sock->sk;
2405 DEFINE_WAIT(wait);
2406 int err;
2407
2408 /* True wake-one mechanism for incoming connections: only
2409 * one process gets woken up, not the 'whole herd'.
2410 * Since we do not 'race & poll' for established sockets
2411 * anymore, the common case will execute the loop only once.
2412 */
2413 for (;;) {
2414 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
2415 TASK_INTERRUPTIBLE);
2416 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2417 release_sock(sk);
2418 timeo = schedule_timeout(timeo);
2419 lock_sock(sk);
2420 }
2421 err = 0;
2422 if (!skb_queue_empty(&sk->sk_receive_queue))
2423 break;
2424 err = -EAGAIN;
2425 if (!timeo)
2426 break;
2427 err = sock_intr_errno(timeo);
2428 if (signal_pending(current))
2429 break;
2430 }
2431 finish_wait(sk_sleep(sk), &wait);
2432 return err;
2433}
2434
2435/**
2436 * tipc_accept - wait for connection request
2437 * @sock: listening socket
2438 * @newsock: new socket that is to be connected
2439 * @flags: file-related flags associated with socket
2440 *
2441 * Returns 0 on success, errno otherwise
2442 */
2443static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2444 bool kern)
2445{
2446 struct sock *new_sk, *sk = sock->sk;
2447 struct sk_buff *buf;
2448 struct tipc_sock *new_tsock;
2449 struct tipc_msg *msg;
2450 long timeo;
2451 int res;
2452
2453 lock_sock(sk);
2454
2455 if (sk->sk_state != TIPC_LISTEN) {
2456 res = -EINVAL;
2457 goto exit;
2458 }
2459 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2460 res = tipc_wait_for_accept(sock, timeo);
2461 if (res)
2462 goto exit;
2463
2464 buf = skb_peek(&sk->sk_receive_queue);
2465
2466 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2467 if (res)
2468 goto exit;
2469 security_sk_clone(sock->sk, new_sock->sk);
2470
2471 new_sk = new_sock->sk;
2472 new_tsock = tipc_sk(new_sk);
2473 msg = buf_msg(buf);
2474
2475 /* we lock on new_sk; but lockdep sees the lock on sk */
2476 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2477
2478 /*
2479 * Reject any stray messages received by new socket
2480 * before the socket lock was taken (very, very unlikely)
2481 */
2482 tsk_rej_rx_queue(new_sk);
2483
2484 /* Connect new socket to it's peer */
2485 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2486
2487 tsk_set_importance(new_tsock, msg_importance(msg));
2488 if (msg_named(msg)) {
2489 new_tsock->conn_type = msg_nametype(msg);
2490 new_tsock->conn_instance = msg_nameinst(msg);
2491 }
2492
2493 /*
2494 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2495 * Respond to 'SYN+' by queuing it on new socket.
2496 */
2497 if (!msg_data_sz(msg)) {
2498 struct msghdr m = {NULL,};
2499
2500 tsk_advance_rx_queue(sk);
2501 __tipc_sendstream(new_sock, &m, 0);
2502 } else {
2503 __skb_dequeue(&sk->sk_receive_queue);
2504 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2505 skb_set_owner_r(buf, new_sk);
2506 }
2507 release_sock(new_sk);
2508exit:
2509 release_sock(sk);
2510 return res;
2511}
2512
2513/**
2514 * tipc_shutdown - shutdown socket connection
2515 * @sock: socket structure
2516 * @how: direction to close (must be SHUT_RDWR)
2517 *
2518 * Terminates connection (if necessary), then purges socket's receive queue.
2519 *
2520 * Returns 0 on success, errno otherwise
2521 */
2522static int tipc_shutdown(struct socket *sock, int how)
2523{
2524 struct sock *sk = sock->sk;
2525 int res;
2526
2527 if (how != SHUT_RDWR)
2528 return -EINVAL;
2529
2530 lock_sock(sk);
2531
2532 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2533 sk->sk_shutdown = SEND_SHUTDOWN;
2534
2535 if (sk->sk_state == TIPC_DISCONNECTING) {
2536 /* Discard any unreceived messages */
2537 __skb_queue_purge(&sk->sk_receive_queue);
2538
2539 /* Wake up anyone sleeping in poll */
2540 sk->sk_state_change(sk);
2541 res = 0;
2542 } else {
2543 res = -ENOTCONN;
2544 }
2545
2546 release_sock(sk);
2547 return res;
2548}
2549
2550static void tipc_sk_timeout(struct timer_list *t)
2551{
2552 struct sock *sk = from_timer(sk, t, sk_timer);
2553 struct tipc_sock *tsk = tipc_sk(sk);
2554 u32 peer_port = tsk_peer_port(tsk);
2555 u32 peer_node = tsk_peer_node(tsk);
2556 u32 own_node = tsk_own_node(tsk);
2557 u32 own_port = tsk->portid;
2558 struct net *net = sock_net(sk);
2559 struct sk_buff *skb = NULL;
2560
2561 bh_lock_sock(sk);
2562 if (!tipc_sk_connected(sk))
2563 goto exit;
2564
2565 /* Try again later if socket is busy */
2566 if (sock_owned_by_user(sk)) {
2567 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2568 goto exit;
2569 }
2570
2571 if (tsk->probe_unacked) {
2572 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2573 tipc_node_remove_conn(net, peer_node, peer_port);
2574 sk->sk_state_change(sk);
2575 goto exit;
2576 }
2577 /* Send new probe */
2578 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2579 peer_node, own_node, peer_port, own_port,
2580 TIPC_OK);
2581 tsk->probe_unacked = true;
2582 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2583exit:
2584 bh_unlock_sock(sk);
2585 if (skb)
2586 tipc_node_xmit_skb(net, skb, peer_node, own_port);
2587 sock_put(sk);
2588}
2589
2590static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2591 struct tipc_name_seq const *seq)
2592{
2593 struct sock *sk = &tsk->sk;
2594 struct net *net = sock_net(sk);
2595 struct publication *publ;
2596 u32 key;
2597
2598 if (scope != TIPC_NODE_SCOPE)
2599 scope = TIPC_CLUSTER_SCOPE;
2600
2601 if (tipc_sk_connected(sk))
2602 return -EINVAL;
2603 key = tsk->portid + tsk->pub_count + 1;
2604 if (key == tsk->portid)
2605 return -EADDRINUSE;
2606
2607 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2608 scope, tsk->portid, key);
2609 if (unlikely(!publ))
2610 return -EINVAL;
2611
2612 list_add(&publ->binding_sock, &tsk->publications);
2613 tsk->pub_count++;
2614 tsk->published = 1;
2615 return 0;
2616}
2617
2618static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2619 struct tipc_name_seq const *seq)
2620{
2621 struct net *net = sock_net(&tsk->sk);
2622 struct publication *publ;
2623 struct publication *safe;
2624 int rc = -EINVAL;
2625
2626 if (scope != TIPC_NODE_SCOPE)
2627 scope = TIPC_CLUSTER_SCOPE;
2628
2629 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) {
2630 if (seq) {
2631 if (publ->scope != scope)
2632 continue;
2633 if (publ->type != seq->type)
2634 continue;
2635 if (publ->lower != seq->lower)
2636 continue;
2637 if (publ->upper != seq->upper)
2638 break;
2639 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2640 publ->upper, publ->key);
2641 rc = 0;
2642 break;
2643 }
2644 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2645 publ->upper, publ->key);
2646 rc = 0;
2647 }
2648 if (list_empty(&tsk->publications))
2649 tsk->published = 0;
2650 return rc;
2651}
2652
2653/* tipc_sk_reinit: set non-zero address in all existing sockets
2654 * when we go from standalone to network mode.
2655 */
2656void tipc_sk_reinit(struct net *net)
2657{
2658 struct tipc_net *tn = net_generic(net, tipc_net_id);
2659 struct rhashtable_iter iter;
2660 struct tipc_sock *tsk;
2661 struct tipc_msg *msg;
2662
2663 rhashtable_walk_enter(&tn->sk_rht, &iter);
2664
2665 do {
2666 rhashtable_walk_start(&iter);
2667
2668 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2669 spin_lock_bh(&tsk->sk.sk_lock.slock);
2670 msg = &tsk->phdr;
2671 msg_set_prevnode(msg, tipc_own_addr(net));
2672 msg_set_orignode(msg, tipc_own_addr(net));
2673 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2674 }
2675
2676 rhashtable_walk_stop(&iter);
2677 } while (tsk == ERR_PTR(-EAGAIN));
2678}
2679
2680static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2681{
2682 struct tipc_net *tn = net_generic(net, tipc_net_id);
2683 struct tipc_sock *tsk;
2684
2685 rcu_read_lock();
2686 tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
2687 if (tsk)
2688 sock_hold(&tsk->sk);
2689 rcu_read_unlock();
2690
2691 return tsk;
2692}
2693
2694static int tipc_sk_insert(struct tipc_sock *tsk)
2695{
2696 struct sock *sk = &tsk->sk;
2697 struct net *net = sock_net(sk);
2698 struct tipc_net *tn = net_generic(net, tipc_net_id);
2699 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2700 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2701
2702 while (remaining--) {
2703 portid++;
2704 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2705 portid = TIPC_MIN_PORT;
2706 tsk->portid = portid;
2707 sock_hold(&tsk->sk);
2708 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2709 tsk_rht_params))
2710 return 0;
2711 sock_put(&tsk->sk);
2712 }
2713
2714 return -1;
2715}
2716
2717static void tipc_sk_remove(struct tipc_sock *tsk)
2718{
2719 struct sock *sk = &tsk->sk;
2720 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
2721
2722 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
2723 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
2724 __sock_put(sk);
2725 }
2726}
2727
2728static const struct rhashtable_params tsk_rht_params = {
2729 .nelem_hint = 192,
2730 .head_offset = offsetof(struct tipc_sock, node),
2731 .key_offset = offsetof(struct tipc_sock, portid),
2732 .key_len = sizeof(u32), /* portid */
2733 .max_size = 1048576,
2734 .min_size = 256,
2735 .automatic_shrinking = true,
2736};
2737
2738int tipc_sk_rht_init(struct net *net)
2739{
2740 struct tipc_net *tn = net_generic(net, tipc_net_id);
2741
2742 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
2743}
2744
2745void tipc_sk_rht_destroy(struct net *net)
2746{
2747 struct tipc_net *tn = net_generic(net, tipc_net_id);
2748
2749 /* Wait for socket readers to complete */
2750 synchronize_net();
2751
2752 rhashtable_destroy(&tn->sk_rht);
2753}
2754
2755static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
2756{
2757 struct net *net = sock_net(&tsk->sk);
2758 struct tipc_group *grp = tsk->group;
2759 struct tipc_msg *hdr = &tsk->phdr;
2760 struct tipc_name_seq seq;
2761 int rc;
2762
2763 if (mreq->type < TIPC_RESERVED_TYPES)
2764 return -EACCES;
2765 if (mreq->scope > TIPC_NODE_SCOPE)
2766 return -EINVAL;
2767 if (grp)
2768 return -EACCES;
2769 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
2770 if (!grp)
2771 return -ENOMEM;
2772 tsk->group = grp;
2773 msg_set_lookup_scope(hdr, mreq->scope);
2774 msg_set_nametype(hdr, mreq->type);
2775 msg_set_dest_droppable(hdr, true);
2776 seq.type = mreq->type;
2777 seq.lower = mreq->instance;
2778 seq.upper = seq.lower;
2779 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope);
2780 rc = tipc_sk_publish(tsk, mreq->scope, &seq);
2781 if (rc) {
2782 tipc_group_delete(net, grp);
2783 tsk->group = NULL;
2784 return rc;
2785 }
2786 /* Eliminate any risk that a broadcast overtakes sent JOINs */
2787 tsk->mc_method.rcast = true;
2788 tsk->mc_method.mandatory = true;
2789 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
2790 return rc;
2791}
2792
2793static int tipc_sk_leave(struct tipc_sock *tsk)
2794{
2795 struct net *net = sock_net(&tsk->sk);
2796 struct tipc_group *grp = tsk->group;
2797 struct tipc_name_seq seq;
2798 int scope;
2799
2800 if (!grp)
2801 return -EINVAL;
2802 tipc_group_self(grp, &seq, &scope);
2803 tipc_group_delete(net, grp);
2804 tsk->group = NULL;
2805 tipc_sk_withdraw(tsk, scope, &seq);
2806 return 0;
2807}
2808
2809/**
2810 * tipc_setsockopt - set socket option
2811 * @sock: socket structure
2812 * @lvl: option level
2813 * @opt: option identifier
2814 * @ov: pointer to new option value
2815 * @ol: length of option value
2816 *
2817 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2818 * (to ease compatibility).
2819 *
2820 * Returns 0 on success, errno otherwise
2821 */
2822static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2823 char __user *ov, unsigned int ol)
2824{
2825 struct sock *sk = sock->sk;
2826 struct tipc_sock *tsk = tipc_sk(sk);
2827 struct tipc_group_req mreq;
2828 u32 value = 0;
2829 int res = 0;
2830
2831 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2832 return 0;
2833 if (lvl != SOL_TIPC)
2834 return -ENOPROTOOPT;
2835
2836 switch (opt) {
2837 case TIPC_IMPORTANCE:
2838 case TIPC_SRC_DROPPABLE:
2839 case TIPC_DEST_DROPPABLE:
2840 case TIPC_CONN_TIMEOUT:
2841 if (ol < sizeof(value))
2842 return -EINVAL;
2843 if (get_user(value, (u32 __user *)ov))
2844 return -EFAULT;
2845 break;
2846 case TIPC_GROUP_JOIN:
2847 if (ol < sizeof(mreq))
2848 return -EINVAL;
2849 if (copy_from_user(&mreq, ov, sizeof(mreq)))
2850 return -EFAULT;
2851 break;
2852 default:
2853 if (ov || ol)
2854 return -EINVAL;
2855 }
2856
2857 lock_sock(sk);
2858
2859 switch (opt) {
2860 case TIPC_IMPORTANCE:
2861 res = tsk_set_importance(tsk, value);
2862 break;
2863 case TIPC_SRC_DROPPABLE:
2864 if (sock->type != SOCK_STREAM)
2865 tsk_set_unreliable(tsk, value);
2866 else
2867 res = -ENOPROTOOPT;
2868 break;
2869 case TIPC_DEST_DROPPABLE:
2870 tsk_set_unreturnable(tsk, value);
2871 break;
2872 case TIPC_CONN_TIMEOUT:
2873 tipc_sk(sk)->conn_timeout = value;
2874 break;
2875 case TIPC_MCAST_BROADCAST:
2876 tsk->mc_method.rcast = false;
2877 tsk->mc_method.mandatory = true;
2878 break;
2879 case TIPC_MCAST_REPLICAST:
2880 tsk->mc_method.rcast = true;
2881 tsk->mc_method.mandatory = true;
2882 break;
2883 case TIPC_GROUP_JOIN:
2884 res = tipc_sk_join(tsk, &mreq);
2885 break;
2886 case TIPC_GROUP_LEAVE:
2887 res = tipc_sk_leave(tsk);
2888 break;
2889 default:
2890 res = -EINVAL;
2891 }
2892
2893 release_sock(sk);
2894
2895 return res;
2896}
2897
2898/**
2899 * tipc_getsockopt - get socket option
2900 * @sock: socket structure
2901 * @lvl: option level
2902 * @opt: option identifier
2903 * @ov: receptacle for option value
2904 * @ol: receptacle for length of option value
2905 *
2906 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2907 * (to ease compatibility).
2908 *
2909 * Returns 0 on success, errno otherwise
2910 */
2911static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2912 char __user *ov, int __user *ol)
2913{
2914 struct sock *sk = sock->sk;
2915 struct tipc_sock *tsk = tipc_sk(sk);
2916 struct tipc_name_seq seq;
2917 int len, scope;
2918 u32 value;
2919 int res;
2920
2921 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2922 return put_user(0, ol);
2923 if (lvl != SOL_TIPC)
2924 return -ENOPROTOOPT;
2925 res = get_user(len, ol);
2926 if (res)
2927 return res;
2928
2929 lock_sock(sk);
2930
2931 switch (opt) {
2932 case TIPC_IMPORTANCE:
2933 value = tsk_importance(tsk);
2934 break;
2935 case TIPC_SRC_DROPPABLE:
2936 value = tsk_unreliable(tsk);
2937 break;
2938 case TIPC_DEST_DROPPABLE:
2939 value = tsk_unreturnable(tsk);
2940 break;
2941 case TIPC_CONN_TIMEOUT:
2942 value = tsk->conn_timeout;
2943 /* no need to set "res", since already 0 at this point */
2944 break;
2945 case TIPC_NODE_RECVQ_DEPTH:
2946 value = 0; /* was tipc_queue_size, now obsolete */
2947 break;
2948 case TIPC_SOCK_RECVQ_DEPTH:
2949 value = skb_queue_len(&sk->sk_receive_queue);
2950 break;
2951 case TIPC_GROUP_JOIN:
2952 seq.type = 0;
2953 if (tsk->group)
2954 tipc_group_self(tsk->group, &seq, &scope);
2955 value = seq.type;
2956 break;
2957 default:
2958 res = -EINVAL;
2959 }
2960
2961 release_sock(sk);
2962
2963 if (res)
2964 return res; /* "get" failed */
2965
2966 if (len < sizeof(value))
2967 return -EINVAL;
2968
2969 if (copy_to_user(ov, &value, sizeof(value)))
2970 return -EFAULT;
2971
2972 return put_user(sizeof(value), ol);
2973}
2974
2975static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2976{
2977 struct sock *sk = sock->sk;
2978 struct tipc_sioc_ln_req lnr;
2979 void __user *argp = (void __user *)arg;
2980
2981 switch (cmd) {
2982 case SIOCGETLINKNAME:
2983 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2984 return -EFAULT;
2985 if (!tipc_node_get_linkname(sock_net(sk),
2986 lnr.bearer_id & 0xffff, lnr.peer,
2987 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2988 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2989 return -EFAULT;
2990 return 0;
2991 }
2992 return -EADDRNOTAVAIL;
2993 default:
2994 return -ENOIOCTLCMD;
2995 }
2996}
2997
2998static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
2999{
3000 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3001 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3002 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3003
3004 tsk1->peer.family = AF_TIPC;
3005 tsk1->peer.addrtype = TIPC_ADDR_ID;
3006 tsk1->peer.scope = TIPC_NODE_SCOPE;
3007 tsk1->peer.addr.id.ref = tsk2->portid;
3008 tsk1->peer.addr.id.node = onode;
3009 tsk2->peer.family = AF_TIPC;
3010 tsk2->peer.addrtype = TIPC_ADDR_ID;
3011 tsk2->peer.scope = TIPC_NODE_SCOPE;
3012 tsk2->peer.addr.id.ref = tsk1->portid;
3013 tsk2->peer.addr.id.node = onode;
3014
3015 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3016 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3017 return 0;
3018}
3019
3020/* Protocol switches for the various types of TIPC sockets */
3021
3022static const struct proto_ops msg_ops = {
3023 .owner = THIS_MODULE,
3024 .family = AF_TIPC,
3025 .release = tipc_release,
3026 .bind = tipc_bind,
3027 .connect = tipc_connect,
3028 .socketpair = tipc_socketpair,
3029 .accept = sock_no_accept,
3030 .getname = tipc_getname,
3031 .poll = tipc_poll,
3032 .ioctl = tipc_ioctl,
3033 .listen = sock_no_listen,
3034 .shutdown = tipc_shutdown,
3035 .setsockopt = tipc_setsockopt,
3036 .getsockopt = tipc_getsockopt,
3037 .sendmsg = tipc_sendmsg,
3038 .recvmsg = tipc_recvmsg,
3039 .mmap = sock_no_mmap,
3040 .sendpage = sock_no_sendpage
3041};
3042
3043static const struct proto_ops packet_ops = {
3044 .owner = THIS_MODULE,
3045 .family = AF_TIPC,
3046 .release = tipc_release,
3047 .bind = tipc_bind,
3048 .connect = tipc_connect,
3049 .socketpair = tipc_socketpair,
3050 .accept = tipc_accept,
3051 .getname = tipc_getname,
3052 .poll = tipc_poll,
3053 .ioctl = tipc_ioctl,
3054 .listen = tipc_listen,
3055 .shutdown = tipc_shutdown,
3056 .setsockopt = tipc_setsockopt,
3057 .getsockopt = tipc_getsockopt,
3058 .sendmsg = tipc_send_packet,
3059 .recvmsg = tipc_recvmsg,
3060 .mmap = sock_no_mmap,
3061 .sendpage = sock_no_sendpage
3062};
3063
3064static const struct proto_ops stream_ops = {
3065 .owner = THIS_MODULE,
3066 .family = AF_TIPC,
3067 .release = tipc_release,
3068 .bind = tipc_bind,
3069 .connect = tipc_connect,
3070 .socketpair = tipc_socketpair,
3071 .accept = tipc_accept,
3072 .getname = tipc_getname,
3073 .poll = tipc_poll,
3074 .ioctl = tipc_ioctl,
3075 .listen = tipc_listen,
3076 .shutdown = tipc_shutdown,
3077 .setsockopt = tipc_setsockopt,
3078 .getsockopt = tipc_getsockopt,
3079 .sendmsg = tipc_sendstream,
3080 .recvmsg = tipc_recvstream,
3081 .mmap = sock_no_mmap,
3082 .sendpage = sock_no_sendpage
3083};
3084
3085static const struct net_proto_family tipc_family_ops = {
3086 .owner = THIS_MODULE,
3087 .family = AF_TIPC,
3088 .create = tipc_sk_create
3089};
3090
3091static struct proto tipc_proto = {
3092 .name = "TIPC",
3093 .owner = THIS_MODULE,
3094 .obj_size = sizeof(struct tipc_sock),
3095 .sysctl_rmem = sysctl_tipc_rmem
3096};
3097
3098/**
3099 * tipc_socket_init - initialize TIPC socket interface
3100 *
3101 * Returns 0 on success, errno otherwise
3102 */
3103int tipc_socket_init(void)
3104{
3105 int res;
3106
3107 res = proto_register(&tipc_proto, 1);
3108 if (res) {
3109 pr_err("Failed to register TIPC protocol type\n");
3110 goto out;
3111 }
3112
3113 res = sock_register(&tipc_family_ops);
3114 if (res) {
3115 pr_err("Failed to register TIPC socket type\n");
3116 proto_unregister(&tipc_proto);
3117 goto out;
3118 }
3119 out:
3120 return res;
3121}
3122
3123/**
3124 * tipc_socket_stop - stop TIPC socket interface
3125 */
3126void tipc_socket_stop(void)
3127{
3128 sock_unregister(tipc_family_ops.family);
3129 proto_unregister(&tipc_proto);
3130}
3131
3132/* Caller should hold socket lock for the passed tipc socket. */
3133static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3134{
3135 u32 peer_node;
3136 u32 peer_port;
3137 struct nlattr *nest;
3138
3139 peer_node = tsk_peer_node(tsk);
3140 peer_port = tsk_peer_port(tsk);
3141
3142 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
3143
3144 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3145 goto msg_full;
3146 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3147 goto msg_full;
3148
3149 if (tsk->conn_type != 0) {
3150 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3151 goto msg_full;
3152 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
3153 goto msg_full;
3154 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
3155 goto msg_full;
3156 }
3157 nla_nest_end(skb, nest);
3158
3159 return 0;
3160
3161msg_full:
3162 nla_nest_cancel(skb, nest);
3163
3164 return -EMSGSIZE;
3165}
3166
3167static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3168 *tsk)
3169{
3170 struct net *net = sock_net(skb->sk);
3171 struct sock *sk = &tsk->sk;
3172
3173 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3174 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3175 return -EMSGSIZE;
3176
3177 if (tipc_sk_connected(sk)) {
3178 if (__tipc_nl_add_sk_con(skb, tsk))
3179 return -EMSGSIZE;
3180 } else if (!list_empty(&tsk->publications)) {
3181 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3182 return -EMSGSIZE;
3183 }
3184 return 0;
3185}
3186
3187/* Caller should hold socket lock for the passed tipc socket. */
3188static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3189 struct tipc_sock *tsk)
3190{
3191 struct nlattr *attrs;
3192 void *hdr;
3193
3194 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3195 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3196 if (!hdr)
3197 goto msg_cancel;
3198
3199 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
3200 if (!attrs)
3201 goto genlmsg_cancel;
3202
3203 if (__tipc_nl_add_sk_info(skb, tsk))
3204 goto attr_msg_cancel;
3205
3206 nla_nest_end(skb, attrs);
3207 genlmsg_end(skb, hdr);
3208
3209 return 0;
3210
3211attr_msg_cancel:
3212 nla_nest_cancel(skb, attrs);
3213genlmsg_cancel:
3214 genlmsg_cancel(skb, hdr);
3215msg_cancel:
3216 return -EMSGSIZE;
3217}
3218
3219int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3220 int (*skb_handler)(struct sk_buff *skb,
3221 struct netlink_callback *cb,
3222 struct tipc_sock *tsk))
3223{
3224 struct net *net = sock_net(skb->sk);
3225 struct tipc_net *tn = tipc_net(net);
3226 const struct bucket_table *tbl;
3227 u32 prev_portid = cb->args[1];
3228 u32 tbl_id = cb->args[0];
3229 struct rhash_head *pos;
3230 struct tipc_sock *tsk;
3231 int err;
3232
3233 rcu_read_lock();
3234 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
3235 for (; tbl_id < tbl->size; tbl_id++) {
3236 rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) {
3237 spin_lock_bh(&tsk->sk.sk_lock.slock);
3238 if (prev_portid && prev_portid != tsk->portid) {
3239 spin_unlock_bh(&tsk->sk.sk_lock.slock);
3240 continue;
3241 }
3242
3243 err = skb_handler(skb, cb, tsk);
3244 if (err) {
3245 prev_portid = tsk->portid;
3246 spin_unlock_bh(&tsk->sk.sk_lock.slock);
3247 goto out;
3248 }
3249
3250 prev_portid = 0;
3251 spin_unlock_bh(&tsk->sk.sk_lock.slock);
3252 }
3253 }
3254out:
3255 rcu_read_unlock();
3256 cb->args[0] = tbl_id;
3257 cb->args[1] = prev_portid;
3258
3259 return skb->len;
3260}
3261EXPORT_SYMBOL(tipc_nl_sk_walk);
3262
3263int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3264 struct tipc_sock *tsk, u32 sk_filter_state,
3265 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3266{
3267 struct sock *sk = &tsk->sk;
3268 struct nlattr *attrs;
3269 struct nlattr *stat;
3270
3271 /*filter response w.r.t sk_state*/
3272 if (!(sk_filter_state & (1 << sk->sk_state)))
3273 return 0;
3274
3275 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
3276 if (!attrs)
3277 goto msg_cancel;
3278
3279 if (__tipc_nl_add_sk_info(skb, tsk))
3280 goto attr_msg_cancel;
3281
3282 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3283 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3284 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3285 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3286 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3287 sock_i_uid(sk))) ||
3288 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3289 tipc_diag_gen_cookie(sk),
3290 TIPC_NLA_SOCK_PAD))
3291 goto attr_msg_cancel;
3292
3293 stat = nla_nest_start(skb, TIPC_NLA_SOCK_STAT);
3294 if (!stat)
3295 goto attr_msg_cancel;
3296
3297 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3298 skb_queue_len(&sk->sk_receive_queue)) ||
3299 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3300 skb_queue_len(&sk->sk_write_queue)) ||
3301 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3302 atomic_read(&sk->sk_drops)))
3303 goto stat_msg_cancel;
3304
3305 if (tsk->cong_link_cnt &&
3306 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3307 goto stat_msg_cancel;
3308
3309 if (tsk_conn_cong(tsk) &&
3310 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3311 goto stat_msg_cancel;
3312
3313 nla_nest_end(skb, stat);
3314 nla_nest_end(skb, attrs);
3315
3316 return 0;
3317
3318stat_msg_cancel:
3319 nla_nest_cancel(skb, stat);
3320attr_msg_cancel:
3321 nla_nest_cancel(skb, attrs);
3322msg_cancel:
3323 return -EMSGSIZE;
3324}
3325EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3326
3327int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3328{
3329 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3330}
3331
3332/* Caller should hold socket lock for the passed tipc socket. */
3333static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3334 struct netlink_callback *cb,
3335 struct publication *publ)
3336{
3337 void *hdr;
3338 struct nlattr *attrs;
3339
3340 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3341 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3342 if (!hdr)
3343 goto msg_cancel;
3344
3345 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
3346 if (!attrs)
3347 goto genlmsg_cancel;
3348
3349 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3350 goto attr_msg_cancel;
3351 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
3352 goto attr_msg_cancel;
3353 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
3354 goto attr_msg_cancel;
3355 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
3356 goto attr_msg_cancel;
3357
3358 nla_nest_end(skb, attrs);
3359 genlmsg_end(skb, hdr);
3360
3361 return 0;
3362
3363attr_msg_cancel:
3364 nla_nest_cancel(skb, attrs);
3365genlmsg_cancel:
3366 genlmsg_cancel(skb, hdr);
3367msg_cancel:
3368 return -EMSGSIZE;
3369}
3370
3371/* Caller should hold socket lock for the passed tipc socket. */
3372static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3373 struct netlink_callback *cb,
3374 struct tipc_sock *tsk, u32 *last_publ)
3375{
3376 int err;
3377 struct publication *p;
3378
3379 if (*last_publ) {
3380 list_for_each_entry(p, &tsk->publications, binding_sock) {
3381 if (p->key == *last_publ)
3382 break;
3383 }
3384 if (p->key != *last_publ) {
3385 /* We never set seq or call nl_dump_check_consistent()
3386 * this means that setting prev_seq here will cause the
3387 * consistence check to fail in the netlink callback
3388 * handler. Resulting in the last NLMSG_DONE message
3389 * having the NLM_F_DUMP_INTR flag set.
3390 */
3391 cb->prev_seq = 1;
3392 *last_publ = 0;
3393 return -EPIPE;
3394 }
3395 } else {
3396 p = list_first_entry(&tsk->publications, struct publication,
3397 binding_sock);
3398 }
3399
3400 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3401 err = __tipc_nl_add_sk_publ(skb, cb, p);
3402 if (err) {
3403 *last_publ = p->key;
3404 return err;
3405 }
3406 }
3407 *last_publ = 0;
3408
3409 return 0;
3410}
3411
3412int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3413{
3414 int err;
3415 u32 tsk_portid = cb->args[0];
3416 u32 last_publ = cb->args[1];
3417 u32 done = cb->args[2];
3418 struct net *net = sock_net(skb->sk);
3419 struct tipc_sock *tsk;
3420
3421 if (!tsk_portid) {
3422 struct nlattr **attrs;
3423 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3424
3425 err = tipc_nlmsg_parse(cb->nlh, &attrs);
3426 if (err)
3427 return err;
3428
3429 if (!attrs[TIPC_NLA_SOCK])
3430 return -EINVAL;
3431
3432 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
3433 attrs[TIPC_NLA_SOCK],
3434 tipc_nl_sock_policy, NULL);
3435 if (err)
3436 return err;
3437
3438 if (!sock[TIPC_NLA_SOCK_REF])
3439 return -EINVAL;
3440
3441 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3442 }
3443
3444 if (done)
3445 return 0;
3446
3447 tsk = tipc_sk_lookup(net, tsk_portid);
3448 if (!tsk)
3449 return -EINVAL;
3450
3451 lock_sock(&tsk->sk);
3452 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3453 if (!err)
3454 done = 1;
3455 release_sock(&tsk->sk);
3456 sock_put(&tsk->sk);
3457
3458 cb->args[0] = tsk_portid;
3459 cb->args[1] = last_publ;
3460 cb->args[2] = done;
3461
3462 return skb->len;
3463}
1/*
2 * net/tipc/socket.c: TIPC socket API
3 *
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2011, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <linux/export.h>
38#include <net/sock.h>
39
40#include "core.h"
41#include "port.h"
42
43#define SS_LISTENING -1 /* socket is listening */
44#define SS_READY -2 /* socket is connectionless */
45
46#define OVERLOAD_LIMIT_BASE 5000
47#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
48
49struct tipc_sock {
50 struct sock sk;
51 struct tipc_port *p;
52 struct tipc_portid peer_name;
53 unsigned int conn_timeout;
54};
55
56#define tipc_sk(sk) ((struct tipc_sock *)(sk))
57#define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p))
58
59#define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
60 (sock->state == SS_DISCONNECTING))
61
62static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
63static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
64static void wakeupdispatch(struct tipc_port *tport);
65
66static const struct proto_ops packet_ops;
67static const struct proto_ops stream_ops;
68static const struct proto_ops msg_ops;
69
70static struct proto tipc_proto;
71
72static int sockets_enabled;
73
74static atomic_t tipc_queue_size = ATOMIC_INIT(0);
75
76/*
77 * Revised TIPC socket locking policy:
78 *
79 * Most socket operations take the standard socket lock when they start
80 * and hold it until they finish (or until they need to sleep). Acquiring
81 * this lock grants the owner exclusive access to the fields of the socket
82 * data structures, with the exception of the backlog queue. A few socket
83 * operations can be done without taking the socket lock because they only
84 * read socket information that never changes during the life of the socket.
85 *
86 * Socket operations may acquire the lock for the associated TIPC port if they
87 * need to perform an operation on the port. If any routine needs to acquire
88 * both the socket lock and the port lock it must take the socket lock first
89 * to avoid the risk of deadlock.
90 *
91 * The dispatcher handling incoming messages cannot grab the socket lock in
92 * the standard fashion, since invoked it runs at the BH level and cannot block.
93 * Instead, it checks to see if the socket lock is currently owned by someone,
94 * and either handles the message itself or adds it to the socket's backlog
95 * queue; in the latter case the queued message is processed once the process
96 * owning the socket lock releases it.
97 *
98 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
99 * the problem of a blocked socket operation preventing any other operations
100 * from occurring. However, applications must be careful if they have
101 * multiple threads trying to send (or receive) on the same socket, as these
102 * operations might interfere with each other. For example, doing a connect
103 * and a receive at the same time might allow the receive to consume the
104 * ACK message meant for the connect. While additional work could be done
105 * to try and overcome this, it doesn't seem to be worthwhile at the present.
106 *
107 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
108 * that another operation that must be performed in a non-blocking manner is
109 * not delayed for very long because the lock has already been taken.
110 *
111 * NOTE: This code assumes that certain fields of a port/socket pair are
112 * constant over its lifetime; such fields can be examined without taking
113 * the socket lock and/or port lock, and do not need to be re-read even
114 * after resuming processing after waiting. These fields include:
115 * - socket type
116 * - pointer to socket sk structure (aka tipc_sock structure)
117 * - pointer to port structure
118 * - port reference
119 */
120
121/**
122 * advance_rx_queue - discard first buffer in socket receive queue
123 *
124 * Caller must hold socket lock
125 */
126static void advance_rx_queue(struct sock *sk)
127{
128 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
129 atomic_dec(&tipc_queue_size);
130}
131
132/**
133 * discard_rx_queue - discard all buffers in socket receive queue
134 *
135 * Caller must hold socket lock
136 */
137static void discard_rx_queue(struct sock *sk)
138{
139 struct sk_buff *buf;
140
141 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
142 atomic_dec(&tipc_queue_size);
143 kfree_skb(buf);
144 }
145}
146
147/**
148 * reject_rx_queue - reject all buffers in socket receive queue
149 *
150 * Caller must hold socket lock
151 */
152static void reject_rx_queue(struct sock *sk)
153{
154 struct sk_buff *buf;
155
156 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
157 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
158 atomic_dec(&tipc_queue_size);
159 }
160}
161
162/**
163 * tipc_create - create a TIPC socket
164 * @net: network namespace (must be default network)
165 * @sock: pre-allocated socket structure
166 * @protocol: protocol indicator (must be 0)
167 * @kern: caused by kernel or by userspace?
168 *
169 * This routine creates additional data structures used by the TIPC socket,
170 * initializes them, and links them together.
171 *
172 * Returns 0 on success, errno otherwise
173 */
174static int tipc_create(struct net *net, struct socket *sock, int protocol,
175 int kern)
176{
177 const struct proto_ops *ops;
178 socket_state state;
179 struct sock *sk;
180 struct tipc_port *tp_ptr;
181
182 /* Validate arguments */
183 if (unlikely(protocol != 0))
184 return -EPROTONOSUPPORT;
185
186 switch (sock->type) {
187 case SOCK_STREAM:
188 ops = &stream_ops;
189 state = SS_UNCONNECTED;
190 break;
191 case SOCK_SEQPACKET:
192 ops = &packet_ops;
193 state = SS_UNCONNECTED;
194 break;
195 case SOCK_DGRAM:
196 case SOCK_RDM:
197 ops = &msg_ops;
198 state = SS_READY;
199 break;
200 default:
201 return -EPROTOTYPE;
202 }
203
204 /* Allocate socket's protocol area */
205 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
206 if (sk == NULL)
207 return -ENOMEM;
208
209 /* Allocate TIPC port for socket to use */
210 tp_ptr = tipc_createport_raw(sk, &dispatch, &wakeupdispatch,
211 TIPC_LOW_IMPORTANCE);
212 if (unlikely(!tp_ptr)) {
213 sk_free(sk);
214 return -ENOMEM;
215 }
216
217 /* Finish initializing socket data structures */
218 sock->ops = ops;
219 sock->state = state;
220
221 sock_init_data(sock, sk);
222 sk->sk_backlog_rcv = backlog_rcv;
223 tipc_sk(sk)->p = tp_ptr;
224 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
225
226 spin_unlock_bh(tp_ptr->lock);
227
228 if (sock->state == SS_READY) {
229 tipc_set_portunreturnable(tp_ptr->ref, 1);
230 if (sock->type == SOCK_DGRAM)
231 tipc_set_portunreliable(tp_ptr->ref, 1);
232 }
233
234 return 0;
235}
236
237/**
238 * release - destroy a TIPC socket
239 * @sock: socket to destroy
240 *
241 * This routine cleans up any messages that are still queued on the socket.
242 * For DGRAM and RDM socket types, all queued messages are rejected.
243 * For SEQPACKET and STREAM socket types, the first message is rejected
244 * and any others are discarded. (If the first message on a STREAM socket
245 * is partially-read, it is discarded and the next one is rejected instead.)
246 *
247 * NOTE: Rejected messages are not necessarily returned to the sender! They
248 * are returned or discarded according to the "destination droppable" setting
249 * specified for the message by the sender.
250 *
251 * Returns 0 on success, errno otherwise
252 */
253static int release(struct socket *sock)
254{
255 struct sock *sk = sock->sk;
256 struct tipc_port *tport;
257 struct sk_buff *buf;
258 int res;
259
260 /*
261 * Exit if socket isn't fully initialized (occurs when a failed accept()
262 * releases a pre-allocated child socket that was never used)
263 */
264 if (sk == NULL)
265 return 0;
266
267 tport = tipc_sk_port(sk);
268 lock_sock(sk);
269
270 /*
271 * Reject all unreceived messages, except on an active connection
272 * (which disconnects locally & sends a 'FIN+' to peer)
273 */
274 while (sock->state != SS_DISCONNECTING) {
275 buf = __skb_dequeue(&sk->sk_receive_queue);
276 if (buf == NULL)
277 break;
278 atomic_dec(&tipc_queue_size);
279 if (TIPC_SKB_CB(buf)->handle != 0)
280 kfree_skb(buf);
281 else {
282 if ((sock->state == SS_CONNECTING) ||
283 (sock->state == SS_CONNECTED)) {
284 sock->state = SS_DISCONNECTING;
285 tipc_disconnect(tport->ref);
286 }
287 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
288 }
289 }
290
291 /*
292 * Delete TIPC port; this ensures no more messages are queued
293 * (also disconnects an active connection & sends a 'FIN-' to peer)
294 */
295 res = tipc_deleteport(tport->ref);
296
297 /* Discard any remaining (connection-based) messages in receive queue */
298 discard_rx_queue(sk);
299
300 /* Reject any messages that accumulated in backlog queue */
301 sock->state = SS_DISCONNECTING;
302 release_sock(sk);
303
304 sock_put(sk);
305 sock->sk = NULL;
306
307 return res;
308}
309
310/**
311 * bind - associate or disassocate TIPC name(s) with a socket
312 * @sock: socket structure
313 * @uaddr: socket address describing name(s) and desired operation
314 * @uaddr_len: size of socket address data structure
315 *
316 * Name and name sequence binding is indicated using a positive scope value;
317 * a negative scope value unbinds the specified name. Specifying no name
318 * (i.e. a socket address length of 0) unbinds all names from the socket.
319 *
320 * Returns 0 on success, errno otherwise
321 *
322 * NOTE: This routine doesn't need to take the socket lock since it doesn't
323 * access any non-constant socket information.
324 */
325static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
326{
327 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
328 u32 portref = tipc_sk_port(sock->sk)->ref;
329
330 if (unlikely(!uaddr_len))
331 return tipc_withdraw(portref, 0, NULL);
332
333 if (uaddr_len < sizeof(struct sockaddr_tipc))
334 return -EINVAL;
335 if (addr->family != AF_TIPC)
336 return -EAFNOSUPPORT;
337
338 if (addr->addrtype == TIPC_ADDR_NAME)
339 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
340 else if (addr->addrtype != TIPC_ADDR_NAMESEQ)
341 return -EAFNOSUPPORT;
342
343 if (addr->addr.nameseq.type < TIPC_RESERVED_TYPES)
344 return -EACCES;
345
346 return (addr->scope > 0) ?
347 tipc_publish(portref, addr->scope, &addr->addr.nameseq) :
348 tipc_withdraw(portref, -addr->scope, &addr->addr.nameseq);
349}
350
351/**
352 * get_name - get port ID of socket or peer socket
353 * @sock: socket structure
354 * @uaddr: area for returned socket address
355 * @uaddr_len: area for returned length of socket address
356 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
357 *
358 * Returns 0 on success, errno otherwise
359 *
360 * NOTE: This routine doesn't need to take the socket lock since it only
361 * accesses socket information that is unchanging (or which changes in
362 * a completely predictable manner).
363 */
364static int get_name(struct socket *sock, struct sockaddr *uaddr,
365 int *uaddr_len, int peer)
366{
367 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
368 struct tipc_sock *tsock = tipc_sk(sock->sk);
369
370 memset(addr, 0, sizeof(*addr));
371 if (peer) {
372 if ((sock->state != SS_CONNECTED) &&
373 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
374 return -ENOTCONN;
375 addr->addr.id.ref = tsock->peer_name.ref;
376 addr->addr.id.node = tsock->peer_name.node;
377 } else {
378 addr->addr.id.ref = tsock->p->ref;
379 addr->addr.id.node = tipc_own_addr;
380 }
381
382 *uaddr_len = sizeof(*addr);
383 addr->addrtype = TIPC_ADDR_ID;
384 addr->family = AF_TIPC;
385 addr->scope = 0;
386 addr->addr.name.domain = 0;
387
388 return 0;
389}
390
391/**
392 * poll - read and possibly block on pollmask
393 * @file: file structure associated with the socket
394 * @sock: socket for which to calculate the poll bits
395 * @wait: ???
396 *
397 * Returns pollmask value
398 *
399 * COMMENTARY:
400 * It appears that the usual socket locking mechanisms are not useful here
401 * since the pollmask info is potentially out-of-date the moment this routine
402 * exits. TCP and other protocols seem to rely on higher level poll routines
403 * to handle any preventable race conditions, so TIPC will do the same ...
404 *
405 * TIPC sets the returned events as follows:
406 *
407 * socket state flags set
408 * ------------ ---------
409 * unconnected no read flags
410 * no write flags
411 *
412 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
413 * no write flags
414 *
415 * connected POLLIN/POLLRDNORM if data in rx queue
416 * POLLOUT if port is not congested
417 *
418 * disconnecting POLLIN/POLLRDNORM/POLLHUP
419 * no write flags
420 *
421 * listening POLLIN if SYN in rx queue
422 * no write flags
423 *
424 * ready POLLIN/POLLRDNORM if data in rx queue
425 * [connectionless] POLLOUT (since port cannot be congested)
426 *
427 * IMPORTANT: The fact that a read or write operation is indicated does NOT
428 * imply that the operation will succeed, merely that it should be performed
429 * and will not block.
430 */
431static unsigned int poll(struct file *file, struct socket *sock,
432 poll_table *wait)
433{
434 struct sock *sk = sock->sk;
435 u32 mask = 0;
436
437 poll_wait(file, sk_sleep(sk), wait);
438
439 switch ((int)sock->state) {
440 case SS_READY:
441 case SS_CONNECTED:
442 if (!tipc_sk_port(sk)->congested)
443 mask |= POLLOUT;
444 /* fall thru' */
445 case SS_CONNECTING:
446 case SS_LISTENING:
447 if (!skb_queue_empty(&sk->sk_receive_queue))
448 mask |= (POLLIN | POLLRDNORM);
449 break;
450 case SS_DISCONNECTING:
451 mask = (POLLIN | POLLRDNORM | POLLHUP);
452 break;
453 }
454
455 return mask;
456}
457
458/**
459 * dest_name_check - verify user is permitted to send to specified port name
460 * @dest: destination address
461 * @m: descriptor for message to be sent
462 *
463 * Prevents restricted configuration commands from being issued by
464 * unauthorized users.
465 *
466 * Returns 0 if permission is granted, otherwise errno
467 */
468static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
469{
470 struct tipc_cfg_msg_hdr hdr;
471
472 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
473 return 0;
474 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
475 return 0;
476 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
477 return -EACCES;
478
479 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
480 return -EMSGSIZE;
481 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
482 return -EFAULT;
483 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
484 return -EACCES;
485
486 return 0;
487}
488
489/**
490 * send_msg - send message in connectionless manner
491 * @iocb: if NULL, indicates that socket lock is already held
492 * @sock: socket structure
493 * @m: message to send
494 * @total_len: length of message
495 *
496 * Message must have an destination specified explicitly.
497 * Used for SOCK_RDM and SOCK_DGRAM messages,
498 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
499 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
500 *
501 * Returns the number of bytes sent on success, or errno otherwise
502 */
503static int send_msg(struct kiocb *iocb, struct socket *sock,
504 struct msghdr *m, size_t total_len)
505{
506 struct sock *sk = sock->sk;
507 struct tipc_port *tport = tipc_sk_port(sk);
508 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
509 int needs_conn;
510 long timeout_val;
511 int res = -EINVAL;
512
513 if (unlikely(!dest))
514 return -EDESTADDRREQ;
515 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
516 (dest->family != AF_TIPC)))
517 return -EINVAL;
518 if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
519 (m->msg_iovlen > (unsigned int)INT_MAX))
520 return -EMSGSIZE;
521
522 if (iocb)
523 lock_sock(sk);
524
525 needs_conn = (sock->state != SS_READY);
526 if (unlikely(needs_conn)) {
527 if (sock->state == SS_LISTENING) {
528 res = -EPIPE;
529 goto exit;
530 }
531 if (sock->state != SS_UNCONNECTED) {
532 res = -EISCONN;
533 goto exit;
534 }
535 if ((tport->published) ||
536 ((sock->type == SOCK_STREAM) && (total_len != 0))) {
537 res = -EOPNOTSUPP;
538 goto exit;
539 }
540 if (dest->addrtype == TIPC_ADDR_NAME) {
541 tport->conn_type = dest->addr.name.name.type;
542 tport->conn_instance = dest->addr.name.name.instance;
543 }
544
545 /* Abort any pending connection attempts (very unlikely) */
546 reject_rx_queue(sk);
547 }
548
549 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
550
551 do {
552 if (dest->addrtype == TIPC_ADDR_NAME) {
553 res = dest_name_check(dest, m);
554 if (res)
555 break;
556 res = tipc_send2name(tport->ref,
557 &dest->addr.name.name,
558 dest->addr.name.domain,
559 m->msg_iovlen,
560 m->msg_iov,
561 total_len);
562 } else if (dest->addrtype == TIPC_ADDR_ID) {
563 res = tipc_send2port(tport->ref,
564 &dest->addr.id,
565 m->msg_iovlen,
566 m->msg_iov,
567 total_len);
568 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
569 if (needs_conn) {
570 res = -EOPNOTSUPP;
571 break;
572 }
573 res = dest_name_check(dest, m);
574 if (res)
575 break;
576 res = tipc_multicast(tport->ref,
577 &dest->addr.nameseq,
578 m->msg_iovlen,
579 m->msg_iov,
580 total_len);
581 }
582 if (likely(res != -ELINKCONG)) {
583 if (needs_conn && (res >= 0))
584 sock->state = SS_CONNECTING;
585 break;
586 }
587 if (timeout_val <= 0L) {
588 res = timeout_val ? timeout_val : -EWOULDBLOCK;
589 break;
590 }
591 release_sock(sk);
592 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
593 !tport->congested, timeout_val);
594 lock_sock(sk);
595 } while (1);
596
597exit:
598 if (iocb)
599 release_sock(sk);
600 return res;
601}
602
603/**
604 * send_packet - send a connection-oriented message
605 * @iocb: if NULL, indicates that socket lock is already held
606 * @sock: socket structure
607 * @m: message to send
608 * @total_len: length of message
609 *
610 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
611 *
612 * Returns the number of bytes sent on success, or errno otherwise
613 */
614static int send_packet(struct kiocb *iocb, struct socket *sock,
615 struct msghdr *m, size_t total_len)
616{
617 struct sock *sk = sock->sk;
618 struct tipc_port *tport = tipc_sk_port(sk);
619 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
620 long timeout_val;
621 int res;
622
623 /* Handle implied connection establishment */
624 if (unlikely(dest))
625 return send_msg(iocb, sock, m, total_len);
626
627 if ((total_len > TIPC_MAX_USER_MSG_SIZE) ||
628 (m->msg_iovlen > (unsigned int)INT_MAX))
629 return -EMSGSIZE;
630
631 if (iocb)
632 lock_sock(sk);
633
634 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
635
636 do {
637 if (unlikely(sock->state != SS_CONNECTED)) {
638 if (sock->state == SS_DISCONNECTING)
639 res = -EPIPE;
640 else
641 res = -ENOTCONN;
642 break;
643 }
644
645 res = tipc_send(tport->ref, m->msg_iovlen, m->msg_iov,
646 total_len);
647 if (likely(res != -ELINKCONG))
648 break;
649 if (timeout_val <= 0L) {
650 res = timeout_val ? timeout_val : -EWOULDBLOCK;
651 break;
652 }
653 release_sock(sk);
654 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
655 (!tport->congested || !tport->connected), timeout_val);
656 lock_sock(sk);
657 } while (1);
658
659 if (iocb)
660 release_sock(sk);
661 return res;
662}
663
664/**
665 * send_stream - send stream-oriented data
666 * @iocb: (unused)
667 * @sock: socket structure
668 * @m: data to send
669 * @total_len: total length of data to be sent
670 *
671 * Used for SOCK_STREAM data.
672 *
673 * Returns the number of bytes sent on success (or partial success),
674 * or errno if no data sent
675 */
676static int send_stream(struct kiocb *iocb, struct socket *sock,
677 struct msghdr *m, size_t total_len)
678{
679 struct sock *sk = sock->sk;
680 struct tipc_port *tport = tipc_sk_port(sk);
681 struct msghdr my_msg;
682 struct iovec my_iov;
683 struct iovec *curr_iov;
684 int curr_iovlen;
685 char __user *curr_start;
686 u32 hdr_size;
687 int curr_left;
688 int bytes_to_send;
689 int bytes_sent;
690 int res;
691
692 lock_sock(sk);
693
694 /* Handle special cases where there is no connection */
695 if (unlikely(sock->state != SS_CONNECTED)) {
696 if (sock->state == SS_UNCONNECTED) {
697 res = send_packet(NULL, sock, m, total_len);
698 goto exit;
699 } else if (sock->state == SS_DISCONNECTING) {
700 res = -EPIPE;
701 goto exit;
702 } else {
703 res = -ENOTCONN;
704 goto exit;
705 }
706 }
707
708 if (unlikely(m->msg_name)) {
709 res = -EISCONN;
710 goto exit;
711 }
712
713 if ((total_len > (unsigned int)INT_MAX) ||
714 (m->msg_iovlen > (unsigned int)INT_MAX)) {
715 res = -EMSGSIZE;
716 goto exit;
717 }
718
719 /*
720 * Send each iovec entry using one or more messages
721 *
722 * Note: This algorithm is good for the most likely case
723 * (i.e. one large iovec entry), but could be improved to pass sets
724 * of small iovec entries into send_packet().
725 */
726 curr_iov = m->msg_iov;
727 curr_iovlen = m->msg_iovlen;
728 my_msg.msg_iov = &my_iov;
729 my_msg.msg_iovlen = 1;
730 my_msg.msg_flags = m->msg_flags;
731 my_msg.msg_name = NULL;
732 bytes_sent = 0;
733
734 hdr_size = msg_hdr_sz(&tport->phdr);
735
736 while (curr_iovlen--) {
737 curr_start = curr_iov->iov_base;
738 curr_left = curr_iov->iov_len;
739
740 while (curr_left) {
741 bytes_to_send = tport->max_pkt - hdr_size;
742 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
743 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
744 if (curr_left < bytes_to_send)
745 bytes_to_send = curr_left;
746 my_iov.iov_base = curr_start;
747 my_iov.iov_len = bytes_to_send;
748 res = send_packet(NULL, sock, &my_msg, bytes_to_send);
749 if (res < 0) {
750 if (bytes_sent)
751 res = bytes_sent;
752 goto exit;
753 }
754 curr_left -= bytes_to_send;
755 curr_start += bytes_to_send;
756 bytes_sent += bytes_to_send;
757 }
758
759 curr_iov++;
760 }
761 res = bytes_sent;
762exit:
763 release_sock(sk);
764 return res;
765}
766
767/**
768 * auto_connect - complete connection setup to a remote port
769 * @sock: socket structure
770 * @msg: peer's response message
771 *
772 * Returns 0 on success, errno otherwise
773 */
774static int auto_connect(struct socket *sock, struct tipc_msg *msg)
775{
776 struct tipc_sock *tsock = tipc_sk(sock->sk);
777
778 if (msg_errcode(msg)) {
779 sock->state = SS_DISCONNECTING;
780 return -ECONNREFUSED;
781 }
782
783 tsock->peer_name.ref = msg_origport(msg);
784 tsock->peer_name.node = msg_orignode(msg);
785 tipc_connect2port(tsock->p->ref, &tsock->peer_name);
786 tipc_set_portimportance(tsock->p->ref, msg_importance(msg));
787 sock->state = SS_CONNECTED;
788 return 0;
789}
790
791/**
792 * set_orig_addr - capture sender's address for received message
793 * @m: descriptor for message info
794 * @msg: received message header
795 *
796 * Note: Address is not captured if not requested by receiver.
797 */
798static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
799{
800 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
801
802 if (addr) {
803 addr->family = AF_TIPC;
804 addr->addrtype = TIPC_ADDR_ID;
805 addr->addr.id.ref = msg_origport(msg);
806 addr->addr.id.node = msg_orignode(msg);
807 addr->addr.name.domain = 0; /* could leave uninitialized */
808 addr->scope = 0; /* could leave uninitialized */
809 m->msg_namelen = sizeof(struct sockaddr_tipc);
810 }
811}
812
813/**
814 * anc_data_recv - optionally capture ancillary data for received message
815 * @m: descriptor for message info
816 * @msg: received message header
817 * @tport: TIPC port associated with message
818 *
819 * Note: Ancillary data is not captured if not requested by receiver.
820 *
821 * Returns 0 if successful, otherwise errno
822 */
823static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
824 struct tipc_port *tport)
825{
826 u32 anc_data[3];
827 u32 err;
828 u32 dest_type;
829 int has_name;
830 int res;
831
832 if (likely(m->msg_controllen == 0))
833 return 0;
834
835 /* Optionally capture errored message object(s) */
836 err = msg ? msg_errcode(msg) : 0;
837 if (unlikely(err)) {
838 anc_data[0] = err;
839 anc_data[1] = msg_data_sz(msg);
840 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
841 if (res)
842 return res;
843 if (anc_data[1]) {
844 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
845 msg_data(msg));
846 if (res)
847 return res;
848 }
849 }
850
851 /* Optionally capture message destination object */
852 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
853 switch (dest_type) {
854 case TIPC_NAMED_MSG:
855 has_name = 1;
856 anc_data[0] = msg_nametype(msg);
857 anc_data[1] = msg_namelower(msg);
858 anc_data[2] = msg_namelower(msg);
859 break;
860 case TIPC_MCAST_MSG:
861 has_name = 1;
862 anc_data[0] = msg_nametype(msg);
863 anc_data[1] = msg_namelower(msg);
864 anc_data[2] = msg_nameupper(msg);
865 break;
866 case TIPC_CONN_MSG:
867 has_name = (tport->conn_type != 0);
868 anc_data[0] = tport->conn_type;
869 anc_data[1] = tport->conn_instance;
870 anc_data[2] = tport->conn_instance;
871 break;
872 default:
873 has_name = 0;
874 }
875 if (has_name) {
876 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
877 if (res)
878 return res;
879 }
880
881 return 0;
882}
883
884/**
885 * recv_msg - receive packet-oriented message
886 * @iocb: (unused)
887 * @m: descriptor for message info
888 * @buf_len: total size of user buffer area
889 * @flags: receive flags
890 *
891 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
892 * If the complete message doesn't fit in user area, truncate it.
893 *
894 * Returns size of returned message data, errno otherwise
895 */
896static int recv_msg(struct kiocb *iocb, struct socket *sock,
897 struct msghdr *m, size_t buf_len, int flags)
898{
899 struct sock *sk = sock->sk;
900 struct tipc_port *tport = tipc_sk_port(sk);
901 struct sk_buff *buf;
902 struct tipc_msg *msg;
903 long timeout;
904 unsigned int sz;
905 u32 err;
906 int res;
907
908 /* Catch invalid receive requests */
909 if (unlikely(!buf_len))
910 return -EINVAL;
911
912 lock_sock(sk);
913
914 if (unlikely(sock->state == SS_UNCONNECTED)) {
915 res = -ENOTCONN;
916 goto exit;
917 }
918
919 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
920restart:
921
922 /* Look for a message in receive queue; wait if necessary */
923 while (skb_queue_empty(&sk->sk_receive_queue)) {
924 if (sock->state == SS_DISCONNECTING) {
925 res = -ENOTCONN;
926 goto exit;
927 }
928 if (timeout <= 0L) {
929 res = timeout ? timeout : -EWOULDBLOCK;
930 goto exit;
931 }
932 release_sock(sk);
933 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
934 tipc_rx_ready(sock),
935 timeout);
936 lock_sock(sk);
937 }
938
939 /* Look at first message in receive queue */
940 buf = skb_peek(&sk->sk_receive_queue);
941 msg = buf_msg(buf);
942 sz = msg_data_sz(msg);
943 err = msg_errcode(msg);
944
945 /* Complete connection setup for an implied connect */
946 if (unlikely(sock->state == SS_CONNECTING)) {
947 res = auto_connect(sock, msg);
948 if (res)
949 goto exit;
950 }
951
952 /* Discard an empty non-errored message & try again */
953 if ((!sz) && (!err)) {
954 advance_rx_queue(sk);
955 goto restart;
956 }
957
958 /* Capture sender's address (optional) */
959 set_orig_addr(m, msg);
960
961 /* Capture ancillary data (optional) */
962 res = anc_data_recv(m, msg, tport);
963 if (res)
964 goto exit;
965
966 /* Capture message data (if valid) & compute return value (always) */
967 if (!err) {
968 if (unlikely(buf_len < sz)) {
969 sz = buf_len;
970 m->msg_flags |= MSG_TRUNC;
971 }
972 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
973 m->msg_iov, sz);
974 if (res)
975 goto exit;
976 res = sz;
977 } else {
978 if ((sock->state == SS_READY) ||
979 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
980 res = 0;
981 else
982 res = -ECONNRESET;
983 }
984
985 /* Consume received message (optional) */
986 if (likely(!(flags & MSG_PEEK))) {
987 if ((sock->state != SS_READY) &&
988 (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
989 tipc_acknowledge(tport->ref, tport->conn_unacked);
990 advance_rx_queue(sk);
991 }
992exit:
993 release_sock(sk);
994 return res;
995}
996
997/**
998 * recv_stream - receive stream-oriented data
999 * @iocb: (unused)
1000 * @m: descriptor for message info
1001 * @buf_len: total size of user buffer area
1002 * @flags: receive flags
1003 *
1004 * Used for SOCK_STREAM messages only. If not enough data is available
1005 * will optionally wait for more; never truncates data.
1006 *
1007 * Returns size of returned message data, errno otherwise
1008 */
1009static int recv_stream(struct kiocb *iocb, struct socket *sock,
1010 struct msghdr *m, size_t buf_len, int flags)
1011{
1012 struct sock *sk = sock->sk;
1013 struct tipc_port *tport = tipc_sk_port(sk);
1014 struct sk_buff *buf;
1015 struct tipc_msg *msg;
1016 long timeout;
1017 unsigned int sz;
1018 int sz_to_copy, target, needed;
1019 int sz_copied = 0;
1020 u32 err;
1021 int res = 0;
1022
1023 /* Catch invalid receive attempts */
1024 if (unlikely(!buf_len))
1025 return -EINVAL;
1026
1027 lock_sock(sk);
1028
1029 if (unlikely((sock->state == SS_UNCONNECTED) ||
1030 (sock->state == SS_CONNECTING))) {
1031 res = -ENOTCONN;
1032 goto exit;
1033 }
1034
1035 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1036 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1037
1038restart:
1039 /* Look for a message in receive queue; wait if necessary */
1040 while (skb_queue_empty(&sk->sk_receive_queue)) {
1041 if (sock->state == SS_DISCONNECTING) {
1042 res = -ENOTCONN;
1043 goto exit;
1044 }
1045 if (timeout <= 0L) {
1046 res = timeout ? timeout : -EWOULDBLOCK;
1047 goto exit;
1048 }
1049 release_sock(sk);
1050 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
1051 tipc_rx_ready(sock),
1052 timeout);
1053 lock_sock(sk);
1054 }
1055
1056 /* Look at first message in receive queue */
1057 buf = skb_peek(&sk->sk_receive_queue);
1058 msg = buf_msg(buf);
1059 sz = msg_data_sz(msg);
1060 err = msg_errcode(msg);
1061
1062 /* Discard an empty non-errored message & try again */
1063 if ((!sz) && (!err)) {
1064 advance_rx_queue(sk);
1065 goto restart;
1066 }
1067
1068 /* Optionally capture sender's address & ancillary data of first msg */
1069 if (sz_copied == 0) {
1070 set_orig_addr(m, msg);
1071 res = anc_data_recv(m, msg, tport);
1072 if (res)
1073 goto exit;
1074 }
1075
1076 /* Capture message data (if valid) & compute return value (always) */
1077 if (!err) {
1078 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1079
1080 sz -= offset;
1081 needed = (buf_len - sz_copied);
1082 sz_to_copy = (sz <= needed) ? sz : needed;
1083
1084 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1085 m->msg_iov, sz_to_copy);
1086 if (res)
1087 goto exit;
1088
1089 sz_copied += sz_to_copy;
1090
1091 if (sz_to_copy < sz) {
1092 if (!(flags & MSG_PEEK))
1093 TIPC_SKB_CB(buf)->handle =
1094 (void *)(unsigned long)(offset + sz_to_copy);
1095 goto exit;
1096 }
1097 } else {
1098 if (sz_copied != 0)
1099 goto exit; /* can't add error msg to valid data */
1100
1101 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1102 res = 0;
1103 else
1104 res = -ECONNRESET;
1105 }
1106
1107 /* Consume received message (optional) */
1108 if (likely(!(flags & MSG_PEEK))) {
1109 if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1110 tipc_acknowledge(tport->ref, tport->conn_unacked);
1111 advance_rx_queue(sk);
1112 }
1113
1114 /* Loop around if more data is required */
1115 if ((sz_copied < buf_len) && /* didn't get all requested data */
1116 (!skb_queue_empty(&sk->sk_receive_queue) ||
1117 (sz_copied < target)) && /* and more is ready or required */
1118 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1119 (!err)) /* and haven't reached a FIN */
1120 goto restart;
1121
1122exit:
1123 release_sock(sk);
1124 return sz_copied ? sz_copied : res;
1125}
1126
1127/**
1128 * rx_queue_full - determine if receive queue can accept another message
1129 * @msg: message to be added to queue
1130 * @queue_size: current size of queue
1131 * @base: nominal maximum size of queue
1132 *
1133 * Returns 1 if queue is unable to accept message, 0 otherwise
1134 */
1135static int rx_queue_full(struct tipc_msg *msg, u32 queue_size, u32 base)
1136{
1137 u32 threshold;
1138 u32 imp = msg_importance(msg);
1139
1140 if (imp == TIPC_LOW_IMPORTANCE)
1141 threshold = base;
1142 else if (imp == TIPC_MEDIUM_IMPORTANCE)
1143 threshold = base * 2;
1144 else if (imp == TIPC_HIGH_IMPORTANCE)
1145 threshold = base * 100;
1146 else
1147 return 0;
1148
1149 if (msg_connected(msg))
1150 threshold *= 4;
1151
1152 return queue_size >= threshold;
1153}
1154
1155/**
1156 * filter_rcv - validate incoming message
1157 * @sk: socket
1158 * @buf: message
1159 *
1160 * Enqueues message on receive queue if acceptable; optionally handles
1161 * disconnect indication for a connected socket.
1162 *
1163 * Called with socket lock already taken; port lock may also be taken.
1164 *
1165 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1166 */
1167static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
1168{
1169 struct socket *sock = sk->sk_socket;
1170 struct tipc_msg *msg = buf_msg(buf);
1171 u32 recv_q_len;
1172
1173 /* Reject message if it is wrong sort of message for socket */
1174 if (msg_type(msg) > TIPC_DIRECT_MSG)
1175 return TIPC_ERR_NO_PORT;
1176
1177 if (sock->state == SS_READY) {
1178 if (msg_connected(msg))
1179 return TIPC_ERR_NO_PORT;
1180 } else {
1181 if (msg_mcast(msg))
1182 return TIPC_ERR_NO_PORT;
1183 if (sock->state == SS_CONNECTED) {
1184 if (!msg_connected(msg) ||
1185 !tipc_port_peer_msg(tipc_sk_port(sk), msg))
1186 return TIPC_ERR_NO_PORT;
1187 } else if (sock->state == SS_CONNECTING) {
1188 if (!msg_connected(msg) && (msg_errcode(msg) == 0))
1189 return TIPC_ERR_NO_PORT;
1190 } else if (sock->state == SS_LISTENING) {
1191 if (msg_connected(msg) || msg_errcode(msg))
1192 return TIPC_ERR_NO_PORT;
1193 } else if (sock->state == SS_DISCONNECTING) {
1194 return TIPC_ERR_NO_PORT;
1195 } else /* (sock->state == SS_UNCONNECTED) */ {
1196 if (msg_connected(msg) || msg_errcode(msg))
1197 return TIPC_ERR_NO_PORT;
1198 }
1199 }
1200
1201 /* Reject message if there isn't room to queue it */
1202 recv_q_len = (u32)atomic_read(&tipc_queue_size);
1203 if (unlikely(recv_q_len >= OVERLOAD_LIMIT_BASE)) {
1204 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE))
1205 return TIPC_ERR_OVERLOAD;
1206 }
1207 recv_q_len = skb_queue_len(&sk->sk_receive_queue);
1208 if (unlikely(recv_q_len >= (OVERLOAD_LIMIT_BASE / 2))) {
1209 if (rx_queue_full(msg, recv_q_len, OVERLOAD_LIMIT_BASE / 2))
1210 return TIPC_ERR_OVERLOAD;
1211 }
1212
1213 /* Enqueue message (finally!) */
1214 TIPC_SKB_CB(buf)->handle = 0;
1215 atomic_inc(&tipc_queue_size);
1216 __skb_queue_tail(&sk->sk_receive_queue, buf);
1217
1218 /* Initiate connection termination for an incoming 'FIN' */
1219 if (unlikely(msg_errcode(msg) && (sock->state == SS_CONNECTED))) {
1220 sock->state = SS_DISCONNECTING;
1221 tipc_disconnect_port(tipc_sk_port(sk));
1222 }
1223
1224 if (waitqueue_active(sk_sleep(sk)))
1225 wake_up_interruptible(sk_sleep(sk));
1226 return TIPC_OK;
1227}
1228
1229/**
1230 * backlog_rcv - handle incoming message from backlog queue
1231 * @sk: socket
1232 * @buf: message
1233 *
1234 * Caller must hold socket lock, but not port lock.
1235 *
1236 * Returns 0
1237 */
1238static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1239{
1240 u32 res;
1241
1242 res = filter_rcv(sk, buf);
1243 if (res)
1244 tipc_reject_msg(buf, res);
1245 return 0;
1246}
1247
1248/**
1249 * dispatch - handle incoming message
1250 * @tport: TIPC port that received message
1251 * @buf: message
1252 *
1253 * Called with port lock already taken.
1254 *
1255 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1256 */
1257static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1258{
1259 struct sock *sk = (struct sock *)tport->usr_handle;
1260 u32 res;
1261
1262 /*
1263 * Process message if socket is unlocked; otherwise add to backlog queue
1264 *
1265 * This code is based on sk_receive_skb(), but must be distinct from it
1266 * since a TIPC-specific filter/reject mechanism is utilized
1267 */
1268 bh_lock_sock(sk);
1269 if (!sock_owned_by_user(sk)) {
1270 res = filter_rcv(sk, buf);
1271 } else {
1272 if (sk_add_backlog(sk, buf, sk->sk_rcvbuf))
1273 res = TIPC_ERR_OVERLOAD;
1274 else
1275 res = TIPC_OK;
1276 }
1277 bh_unlock_sock(sk);
1278
1279 return res;
1280}
1281
1282/**
1283 * wakeupdispatch - wake up port after congestion
1284 * @tport: port to wakeup
1285 *
1286 * Called with port lock already taken.
1287 */
1288static void wakeupdispatch(struct tipc_port *tport)
1289{
1290 struct sock *sk = (struct sock *)tport->usr_handle;
1291
1292 if (waitqueue_active(sk_sleep(sk)))
1293 wake_up_interruptible(sk_sleep(sk));
1294}
1295
1296/**
1297 * connect - establish a connection to another TIPC port
1298 * @sock: socket structure
1299 * @dest: socket address for destination port
1300 * @destlen: size of socket address data structure
1301 * @flags: file-related flags associated with socket
1302 *
1303 * Returns 0 on success, errno otherwise
1304 */
1305static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
1306 int flags)
1307{
1308 struct sock *sk = sock->sk;
1309 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1310 struct msghdr m = {NULL,};
1311 struct sk_buff *buf;
1312 struct tipc_msg *msg;
1313 unsigned int timeout;
1314 int res;
1315
1316 lock_sock(sk);
1317
1318 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1319 if (sock->state == SS_READY) {
1320 res = -EOPNOTSUPP;
1321 goto exit;
1322 }
1323
1324 /* For now, TIPC does not support the non-blocking form of connect() */
1325 if (flags & O_NONBLOCK) {
1326 res = -EOPNOTSUPP;
1327 goto exit;
1328 }
1329
1330 /* Issue Posix-compliant error code if socket is in the wrong state */
1331 if (sock->state == SS_LISTENING) {
1332 res = -EOPNOTSUPP;
1333 goto exit;
1334 }
1335 if (sock->state == SS_CONNECTING) {
1336 res = -EALREADY;
1337 goto exit;
1338 }
1339 if (sock->state != SS_UNCONNECTED) {
1340 res = -EISCONN;
1341 goto exit;
1342 }
1343
1344 /*
1345 * Reject connection attempt using multicast address
1346 *
1347 * Note: send_msg() validates the rest of the address fields,
1348 * so there's no need to do it here
1349 */
1350 if (dst->addrtype == TIPC_ADDR_MCAST) {
1351 res = -EINVAL;
1352 goto exit;
1353 }
1354
1355 /* Reject any messages already in receive queue (very unlikely) */
1356 reject_rx_queue(sk);
1357
1358 /* Send a 'SYN-' to destination */
1359 m.msg_name = dest;
1360 m.msg_namelen = destlen;
1361 res = send_msg(NULL, sock, &m, 0);
1362 if (res < 0)
1363 goto exit;
1364
1365 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1366 timeout = tipc_sk(sk)->conn_timeout;
1367 release_sock(sk);
1368 res = wait_event_interruptible_timeout(*sk_sleep(sk),
1369 (!skb_queue_empty(&sk->sk_receive_queue) ||
1370 (sock->state != SS_CONNECTING)),
1371 timeout ? (long)msecs_to_jiffies(timeout)
1372 : MAX_SCHEDULE_TIMEOUT);
1373 lock_sock(sk);
1374
1375 if (res > 0) {
1376 buf = skb_peek(&sk->sk_receive_queue);
1377 if (buf != NULL) {
1378 msg = buf_msg(buf);
1379 res = auto_connect(sock, msg);
1380 if (!res) {
1381 if (!msg_data_sz(msg))
1382 advance_rx_queue(sk);
1383 }
1384 } else {
1385 if (sock->state == SS_CONNECTED)
1386 res = -EISCONN;
1387 else
1388 res = -ECONNREFUSED;
1389 }
1390 } else {
1391 if (res == 0)
1392 res = -ETIMEDOUT;
1393 else
1394 ; /* leave "res" unchanged */
1395 sock->state = SS_DISCONNECTING;
1396 }
1397
1398exit:
1399 release_sock(sk);
1400 return res;
1401}
1402
1403/**
1404 * listen - allow socket to listen for incoming connections
1405 * @sock: socket structure
1406 * @len: (unused)
1407 *
1408 * Returns 0 on success, errno otherwise
1409 */
1410static int listen(struct socket *sock, int len)
1411{
1412 struct sock *sk = sock->sk;
1413 int res;
1414
1415 lock_sock(sk);
1416
1417 if (sock->state != SS_UNCONNECTED)
1418 res = -EINVAL;
1419 else {
1420 sock->state = SS_LISTENING;
1421 res = 0;
1422 }
1423
1424 release_sock(sk);
1425 return res;
1426}
1427
1428/**
1429 * accept - wait for connection request
1430 * @sock: listening socket
1431 * @newsock: new socket that is to be connected
1432 * @flags: file-related flags associated with socket
1433 *
1434 * Returns 0 on success, errno otherwise
1435 */
1436static int accept(struct socket *sock, struct socket *new_sock, int flags)
1437{
1438 struct sock *sk = sock->sk;
1439 struct sk_buff *buf;
1440 int res;
1441
1442 lock_sock(sk);
1443
1444 if (sock->state != SS_LISTENING) {
1445 res = -EINVAL;
1446 goto exit;
1447 }
1448
1449 while (skb_queue_empty(&sk->sk_receive_queue)) {
1450 if (flags & O_NONBLOCK) {
1451 res = -EWOULDBLOCK;
1452 goto exit;
1453 }
1454 release_sock(sk);
1455 res = wait_event_interruptible(*sk_sleep(sk),
1456 (!skb_queue_empty(&sk->sk_receive_queue)));
1457 lock_sock(sk);
1458 if (res)
1459 goto exit;
1460 }
1461
1462 buf = skb_peek(&sk->sk_receive_queue);
1463
1464 res = tipc_create(sock_net(sock->sk), new_sock, 0, 0);
1465 if (!res) {
1466 struct sock *new_sk = new_sock->sk;
1467 struct tipc_sock *new_tsock = tipc_sk(new_sk);
1468 struct tipc_port *new_tport = new_tsock->p;
1469 u32 new_ref = new_tport->ref;
1470 struct tipc_msg *msg = buf_msg(buf);
1471
1472 lock_sock(new_sk);
1473
1474 /*
1475 * Reject any stray messages received by new socket
1476 * before the socket lock was taken (very, very unlikely)
1477 */
1478 reject_rx_queue(new_sk);
1479
1480 /* Connect new socket to it's peer */
1481 new_tsock->peer_name.ref = msg_origport(msg);
1482 new_tsock->peer_name.node = msg_orignode(msg);
1483 tipc_connect2port(new_ref, &new_tsock->peer_name);
1484 new_sock->state = SS_CONNECTED;
1485
1486 tipc_set_portimportance(new_ref, msg_importance(msg));
1487 if (msg_named(msg)) {
1488 new_tport->conn_type = msg_nametype(msg);
1489 new_tport->conn_instance = msg_nameinst(msg);
1490 }
1491
1492 /*
1493 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1494 * Respond to 'SYN+' by queuing it on new socket.
1495 */
1496 if (!msg_data_sz(msg)) {
1497 struct msghdr m = {NULL,};
1498
1499 advance_rx_queue(sk);
1500 send_packet(NULL, new_sock, &m, 0);
1501 } else {
1502 __skb_dequeue(&sk->sk_receive_queue);
1503 __skb_queue_head(&new_sk->sk_receive_queue, buf);
1504 }
1505 release_sock(new_sk);
1506 }
1507exit:
1508 release_sock(sk);
1509 return res;
1510}
1511
1512/**
1513 * shutdown - shutdown socket connection
1514 * @sock: socket structure
1515 * @how: direction to close (must be SHUT_RDWR)
1516 *
1517 * Terminates connection (if necessary), then purges socket's receive queue.
1518 *
1519 * Returns 0 on success, errno otherwise
1520 */
1521static int shutdown(struct socket *sock, int how)
1522{
1523 struct sock *sk = sock->sk;
1524 struct tipc_port *tport = tipc_sk_port(sk);
1525 struct sk_buff *buf;
1526 int res;
1527
1528 if (how != SHUT_RDWR)
1529 return -EINVAL;
1530
1531 lock_sock(sk);
1532
1533 switch (sock->state) {
1534 case SS_CONNECTING:
1535 case SS_CONNECTED:
1536
1537restart:
1538 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1539 buf = __skb_dequeue(&sk->sk_receive_queue);
1540 if (buf) {
1541 atomic_dec(&tipc_queue_size);
1542 if (TIPC_SKB_CB(buf)->handle != 0) {
1543 kfree_skb(buf);
1544 goto restart;
1545 }
1546 tipc_disconnect(tport->ref);
1547 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1548 } else {
1549 tipc_shutdown(tport->ref);
1550 }
1551
1552 sock->state = SS_DISCONNECTING;
1553
1554 /* fall through */
1555
1556 case SS_DISCONNECTING:
1557
1558 /* Discard any unreceived messages; wake up sleeping tasks */
1559 discard_rx_queue(sk);
1560 if (waitqueue_active(sk_sleep(sk)))
1561 wake_up_interruptible(sk_sleep(sk));
1562 res = 0;
1563 break;
1564
1565 default:
1566 res = -ENOTCONN;
1567 }
1568
1569 release_sock(sk);
1570 return res;
1571}
1572
1573/**
1574 * setsockopt - set socket option
1575 * @sock: socket structure
1576 * @lvl: option level
1577 * @opt: option identifier
1578 * @ov: pointer to new option value
1579 * @ol: length of option value
1580 *
1581 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1582 * (to ease compatibility).
1583 *
1584 * Returns 0 on success, errno otherwise
1585 */
1586static int setsockopt(struct socket *sock,
1587 int lvl, int opt, char __user *ov, unsigned int ol)
1588{
1589 struct sock *sk = sock->sk;
1590 struct tipc_port *tport = tipc_sk_port(sk);
1591 u32 value;
1592 int res;
1593
1594 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1595 return 0;
1596 if (lvl != SOL_TIPC)
1597 return -ENOPROTOOPT;
1598 if (ol < sizeof(value))
1599 return -EINVAL;
1600 res = get_user(value, (u32 __user *)ov);
1601 if (res)
1602 return res;
1603
1604 lock_sock(sk);
1605
1606 switch (opt) {
1607 case TIPC_IMPORTANCE:
1608 res = tipc_set_portimportance(tport->ref, value);
1609 break;
1610 case TIPC_SRC_DROPPABLE:
1611 if (sock->type != SOCK_STREAM)
1612 res = tipc_set_portunreliable(tport->ref, value);
1613 else
1614 res = -ENOPROTOOPT;
1615 break;
1616 case TIPC_DEST_DROPPABLE:
1617 res = tipc_set_portunreturnable(tport->ref, value);
1618 break;
1619 case TIPC_CONN_TIMEOUT:
1620 tipc_sk(sk)->conn_timeout = value;
1621 /* no need to set "res", since already 0 at this point */
1622 break;
1623 default:
1624 res = -EINVAL;
1625 }
1626
1627 release_sock(sk);
1628
1629 return res;
1630}
1631
1632/**
1633 * getsockopt - get socket option
1634 * @sock: socket structure
1635 * @lvl: option level
1636 * @opt: option identifier
1637 * @ov: receptacle for option value
1638 * @ol: receptacle for length of option value
1639 *
1640 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1641 * (to ease compatibility).
1642 *
1643 * Returns 0 on success, errno otherwise
1644 */
1645static int getsockopt(struct socket *sock,
1646 int lvl, int opt, char __user *ov, int __user *ol)
1647{
1648 struct sock *sk = sock->sk;
1649 struct tipc_port *tport = tipc_sk_port(sk);
1650 int len;
1651 u32 value;
1652 int res;
1653
1654 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1655 return put_user(0, ol);
1656 if (lvl != SOL_TIPC)
1657 return -ENOPROTOOPT;
1658 res = get_user(len, ol);
1659 if (res)
1660 return res;
1661
1662 lock_sock(sk);
1663
1664 switch (opt) {
1665 case TIPC_IMPORTANCE:
1666 res = tipc_portimportance(tport->ref, &value);
1667 break;
1668 case TIPC_SRC_DROPPABLE:
1669 res = tipc_portunreliable(tport->ref, &value);
1670 break;
1671 case TIPC_DEST_DROPPABLE:
1672 res = tipc_portunreturnable(tport->ref, &value);
1673 break;
1674 case TIPC_CONN_TIMEOUT:
1675 value = tipc_sk(sk)->conn_timeout;
1676 /* no need to set "res", since already 0 at this point */
1677 break;
1678 case TIPC_NODE_RECVQ_DEPTH:
1679 value = (u32)atomic_read(&tipc_queue_size);
1680 break;
1681 case TIPC_SOCK_RECVQ_DEPTH:
1682 value = skb_queue_len(&sk->sk_receive_queue);
1683 break;
1684 default:
1685 res = -EINVAL;
1686 }
1687
1688 release_sock(sk);
1689
1690 if (res)
1691 return res; /* "get" failed */
1692
1693 if (len < sizeof(value))
1694 return -EINVAL;
1695
1696 if (copy_to_user(ov, &value, sizeof(value)))
1697 return -EFAULT;
1698
1699 return put_user(sizeof(value), ol);
1700}
1701
1702/**
1703 * Protocol switches for the various types of TIPC sockets
1704 */
1705static const struct proto_ops msg_ops = {
1706 .owner = THIS_MODULE,
1707 .family = AF_TIPC,
1708 .release = release,
1709 .bind = bind,
1710 .connect = connect,
1711 .socketpair = sock_no_socketpair,
1712 .accept = sock_no_accept,
1713 .getname = get_name,
1714 .poll = poll,
1715 .ioctl = sock_no_ioctl,
1716 .listen = sock_no_listen,
1717 .shutdown = shutdown,
1718 .setsockopt = setsockopt,
1719 .getsockopt = getsockopt,
1720 .sendmsg = send_msg,
1721 .recvmsg = recv_msg,
1722 .mmap = sock_no_mmap,
1723 .sendpage = sock_no_sendpage
1724};
1725
1726static const struct proto_ops packet_ops = {
1727 .owner = THIS_MODULE,
1728 .family = AF_TIPC,
1729 .release = release,
1730 .bind = bind,
1731 .connect = connect,
1732 .socketpair = sock_no_socketpair,
1733 .accept = accept,
1734 .getname = get_name,
1735 .poll = poll,
1736 .ioctl = sock_no_ioctl,
1737 .listen = listen,
1738 .shutdown = shutdown,
1739 .setsockopt = setsockopt,
1740 .getsockopt = getsockopt,
1741 .sendmsg = send_packet,
1742 .recvmsg = recv_msg,
1743 .mmap = sock_no_mmap,
1744 .sendpage = sock_no_sendpage
1745};
1746
1747static const struct proto_ops stream_ops = {
1748 .owner = THIS_MODULE,
1749 .family = AF_TIPC,
1750 .release = release,
1751 .bind = bind,
1752 .connect = connect,
1753 .socketpair = sock_no_socketpair,
1754 .accept = accept,
1755 .getname = get_name,
1756 .poll = poll,
1757 .ioctl = sock_no_ioctl,
1758 .listen = listen,
1759 .shutdown = shutdown,
1760 .setsockopt = setsockopt,
1761 .getsockopt = getsockopt,
1762 .sendmsg = send_stream,
1763 .recvmsg = recv_stream,
1764 .mmap = sock_no_mmap,
1765 .sendpage = sock_no_sendpage
1766};
1767
1768static const struct net_proto_family tipc_family_ops = {
1769 .owner = THIS_MODULE,
1770 .family = AF_TIPC,
1771 .create = tipc_create
1772};
1773
1774static struct proto tipc_proto = {
1775 .name = "TIPC",
1776 .owner = THIS_MODULE,
1777 .obj_size = sizeof(struct tipc_sock)
1778};
1779
1780/**
1781 * tipc_socket_init - initialize TIPC socket interface
1782 *
1783 * Returns 0 on success, errno otherwise
1784 */
1785int tipc_socket_init(void)
1786{
1787 int res;
1788
1789 res = proto_register(&tipc_proto, 1);
1790 if (res) {
1791 err("Failed to register TIPC protocol type\n");
1792 goto out;
1793 }
1794
1795 res = sock_register(&tipc_family_ops);
1796 if (res) {
1797 err("Failed to register TIPC socket type\n");
1798 proto_unregister(&tipc_proto);
1799 goto out;
1800 }
1801
1802 sockets_enabled = 1;
1803 out:
1804 return res;
1805}
1806
1807/**
1808 * tipc_socket_stop - stop TIPC socket interface
1809 */
1810void tipc_socket_stop(void)
1811{
1812 if (!sockets_enabled)
1813 return;
1814
1815 sockets_enabled = 0;
1816 sock_unregister(tipc_family_ops.family);
1817 proto_unregister(&tipc_proto);
1818}