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1/*
2 * net/tipc/socket.c: TIPC socket API
3 *
4 * Copyright (c) 2001-2007, 2012-2015, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <linux/rhashtable.h>
38#include "core.h"
39#include "name_table.h"
40#include "node.h"
41#include "link.h"
42#include "name_distr.h"
43#include "socket.h"
44#include "bcast.h"
45#include "netlink.h"
46
47#define SS_LISTENING -1 /* socket is listening */
48#define SS_READY -2 /* socket is connectionless */
49
50#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
51#define CONN_PROBING_INTERVAL msecs_to_jiffies(3600000) /* [ms] => 1 h */
52#define TIPC_FWD_MSG 1
53#define TIPC_CONN_OK 0
54#define TIPC_CONN_PROBING 1
55#define TIPC_MAX_PORT 0xffffffff
56#define TIPC_MIN_PORT 1
57
58/**
59 * struct tipc_sock - TIPC socket structure
60 * @sk: socket - interacts with 'port' and with user via the socket API
61 * @connected: non-zero if port is currently connected to a peer port
62 * @conn_type: TIPC type used when connection was established
63 * @conn_instance: TIPC instance used when connection was established
64 * @published: non-zero if port has one or more associated names
65 * @max_pkt: maximum packet size "hint" used when building messages sent by port
66 * @portid: unique port identity in TIPC socket hash table
67 * @phdr: preformatted message header used when sending messages
68 * @port_list: adjacent ports in TIPC's global list of ports
69 * @publications: list of publications for port
70 * @pub_count: total # of publications port has made during its lifetime
71 * @probing_state:
72 * @probing_intv:
73 * @conn_timeout: the time we can wait for an unresponded setup request
74 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
75 * @link_cong: non-zero if owner must sleep because of link congestion
76 * @sent_unacked: # messages sent by socket, and not yet acked by peer
77 * @rcv_unacked: # messages read by user, but not yet acked back to peer
78 * @remote: 'connected' peer for dgram/rdm
79 * @node: hash table node
80 * @rcu: rcu struct for tipc_sock
81 */
82struct tipc_sock {
83 struct sock sk;
84 int connected;
85 u32 conn_type;
86 u32 conn_instance;
87 int published;
88 u32 max_pkt;
89 u32 portid;
90 struct tipc_msg phdr;
91 struct list_head sock_list;
92 struct list_head publications;
93 u32 pub_count;
94 u32 probing_state;
95 unsigned long probing_intv;
96 uint conn_timeout;
97 atomic_t dupl_rcvcnt;
98 bool link_cong;
99 uint sent_unacked;
100 uint rcv_unacked;
101 struct sockaddr_tipc remote;
102 struct rhash_head node;
103 struct rcu_head rcu;
104};
105
106static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
107static void tipc_data_ready(struct sock *sk);
108static void tipc_write_space(struct sock *sk);
109static void tipc_sock_destruct(struct sock *sk);
110static int tipc_release(struct socket *sock);
111static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
112static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
113static void tipc_sk_timeout(unsigned long data);
114static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
115 struct tipc_name_seq const *seq);
116static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
117 struct tipc_name_seq const *seq);
118static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
119static int tipc_sk_insert(struct tipc_sock *tsk);
120static void tipc_sk_remove(struct tipc_sock *tsk);
121static int __tipc_send_stream(struct socket *sock, struct msghdr *m,
122 size_t dsz);
123static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
124
125static const struct proto_ops packet_ops;
126static const struct proto_ops stream_ops;
127static const struct proto_ops msg_ops;
128static struct proto tipc_proto;
129
130static const struct rhashtable_params tsk_rht_params;
131
132/*
133 * Revised TIPC socket locking policy:
134 *
135 * Most socket operations take the standard socket lock when they start
136 * and hold it until they finish (or until they need to sleep). Acquiring
137 * this lock grants the owner exclusive access to the fields of the socket
138 * data structures, with the exception of the backlog queue. A few socket
139 * operations can be done without taking the socket lock because they only
140 * read socket information that never changes during the life of the socket.
141 *
142 * Socket operations may acquire the lock for the associated TIPC port if they
143 * need to perform an operation on the port. If any routine needs to acquire
144 * both the socket lock and the port lock it must take the socket lock first
145 * to avoid the risk of deadlock.
146 *
147 * The dispatcher handling incoming messages cannot grab the socket lock in
148 * the standard fashion, since invoked it runs at the BH level and cannot block.
149 * Instead, it checks to see if the socket lock is currently owned by someone,
150 * and either handles the message itself or adds it to the socket's backlog
151 * queue; in the latter case the queued message is processed once the process
152 * owning the socket lock releases it.
153 *
154 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
155 * the problem of a blocked socket operation preventing any other operations
156 * from occurring. However, applications must be careful if they have
157 * multiple threads trying to send (or receive) on the same socket, as these
158 * operations might interfere with each other. For example, doing a connect
159 * and a receive at the same time might allow the receive to consume the
160 * ACK message meant for the connect. While additional work could be done
161 * to try and overcome this, it doesn't seem to be worthwhile at the present.
162 *
163 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
164 * that another operation that must be performed in a non-blocking manner is
165 * not delayed for very long because the lock has already been taken.
166 *
167 * NOTE: This code assumes that certain fields of a port/socket pair are
168 * constant over its lifetime; such fields can be examined without taking
169 * the socket lock and/or port lock, and do not need to be re-read even
170 * after resuming processing after waiting. These fields include:
171 * - socket type
172 * - pointer to socket sk structure (aka tipc_sock structure)
173 * - pointer to port structure
174 * - port reference
175 */
176
177static u32 tsk_own_node(struct tipc_sock *tsk)
178{
179 return msg_prevnode(&tsk->phdr);
180}
181
182static u32 tsk_peer_node(struct tipc_sock *tsk)
183{
184 return msg_destnode(&tsk->phdr);
185}
186
187static u32 tsk_peer_port(struct tipc_sock *tsk)
188{
189 return msg_destport(&tsk->phdr);
190}
191
192static bool tsk_unreliable(struct tipc_sock *tsk)
193{
194 return msg_src_droppable(&tsk->phdr) != 0;
195}
196
197static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
198{
199 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
200}
201
202static bool tsk_unreturnable(struct tipc_sock *tsk)
203{
204 return msg_dest_droppable(&tsk->phdr) != 0;
205}
206
207static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
208{
209 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
210}
211
212static int tsk_importance(struct tipc_sock *tsk)
213{
214 return msg_importance(&tsk->phdr);
215}
216
217static int tsk_set_importance(struct tipc_sock *tsk, int imp)
218{
219 if (imp > TIPC_CRITICAL_IMPORTANCE)
220 return -EINVAL;
221 msg_set_importance(&tsk->phdr, (u32)imp);
222 return 0;
223}
224
225static struct tipc_sock *tipc_sk(const struct sock *sk)
226{
227 return container_of(sk, struct tipc_sock, sk);
228}
229
230static int tsk_conn_cong(struct tipc_sock *tsk)
231{
232 return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
233}
234
235/**
236 * tsk_advance_rx_queue - discard first buffer in socket receive queue
237 *
238 * Caller must hold socket lock
239 */
240static void tsk_advance_rx_queue(struct sock *sk)
241{
242 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
243}
244
245/* tipc_sk_respond() : send response message back to sender
246 */
247static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
248{
249 u32 selector;
250 u32 dnode;
251 u32 onode = tipc_own_addr(sock_net(sk));
252
253 if (!tipc_msg_reverse(onode, &skb, err))
254 return;
255
256 dnode = msg_destnode(buf_msg(skb));
257 selector = msg_origport(buf_msg(skb));
258 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
259}
260
261/**
262 * tsk_rej_rx_queue - reject all buffers in socket receive queue
263 *
264 * Caller must hold socket lock
265 */
266static void tsk_rej_rx_queue(struct sock *sk)
267{
268 struct sk_buff *skb;
269
270 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
271 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
272}
273
274/* tsk_peer_msg - verify if message was sent by connected port's peer
275 *
276 * Handles cases where the node's network address has changed from
277 * the default of <0.0.0> to its configured setting.
278 */
279static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
280{
281 struct tipc_net *tn = net_generic(sock_net(&tsk->sk), tipc_net_id);
282 u32 peer_port = tsk_peer_port(tsk);
283 u32 orig_node;
284 u32 peer_node;
285
286 if (unlikely(!tsk->connected))
287 return false;
288
289 if (unlikely(msg_origport(msg) != peer_port))
290 return false;
291
292 orig_node = msg_orignode(msg);
293 peer_node = tsk_peer_node(tsk);
294
295 if (likely(orig_node == peer_node))
296 return true;
297
298 if (!orig_node && (peer_node == tn->own_addr))
299 return true;
300
301 if (!peer_node && (orig_node == tn->own_addr))
302 return true;
303
304 return false;
305}
306
307/**
308 * tipc_sk_create - create a TIPC socket
309 * @net: network namespace (must be default network)
310 * @sock: pre-allocated socket structure
311 * @protocol: protocol indicator (must be 0)
312 * @kern: caused by kernel or by userspace?
313 *
314 * This routine creates additional data structures used by the TIPC socket,
315 * initializes them, and links them together.
316 *
317 * Returns 0 on success, errno otherwise
318 */
319static int tipc_sk_create(struct net *net, struct socket *sock,
320 int protocol, int kern)
321{
322 struct tipc_net *tn;
323 const struct proto_ops *ops;
324 socket_state state;
325 struct sock *sk;
326 struct tipc_sock *tsk;
327 struct tipc_msg *msg;
328
329 /* Validate arguments */
330 if (unlikely(protocol != 0))
331 return -EPROTONOSUPPORT;
332
333 switch (sock->type) {
334 case SOCK_STREAM:
335 ops = &stream_ops;
336 state = SS_UNCONNECTED;
337 break;
338 case SOCK_SEQPACKET:
339 ops = &packet_ops;
340 state = SS_UNCONNECTED;
341 break;
342 case SOCK_DGRAM:
343 case SOCK_RDM:
344 ops = &msg_ops;
345 state = SS_READY;
346 break;
347 default:
348 return -EPROTOTYPE;
349 }
350
351 /* Allocate socket's protocol area */
352 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
353 if (sk == NULL)
354 return -ENOMEM;
355
356 tsk = tipc_sk(sk);
357 tsk->max_pkt = MAX_PKT_DEFAULT;
358 INIT_LIST_HEAD(&tsk->publications);
359 msg = &tsk->phdr;
360 tn = net_generic(sock_net(sk), tipc_net_id);
361 tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
362 NAMED_H_SIZE, 0);
363
364 /* Finish initializing socket data structures */
365 sock->ops = ops;
366 sock->state = state;
367 sock_init_data(sock, sk);
368 if (tipc_sk_insert(tsk)) {
369 pr_warn("Socket create failed; port numbrer exhausted\n");
370 return -EINVAL;
371 }
372 msg_set_origport(msg, tsk->portid);
373 setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk);
374 sk->sk_backlog_rcv = tipc_backlog_rcv;
375 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
376 sk->sk_data_ready = tipc_data_ready;
377 sk->sk_write_space = tipc_write_space;
378 sk->sk_destruct = tipc_sock_destruct;
379 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
380 tsk->sent_unacked = 0;
381 atomic_set(&tsk->dupl_rcvcnt, 0);
382
383 if (sock->state == SS_READY) {
384 tsk_set_unreturnable(tsk, true);
385 if (sock->type == SOCK_DGRAM)
386 tsk_set_unreliable(tsk, true);
387 }
388 return 0;
389}
390
391static void tipc_sk_callback(struct rcu_head *head)
392{
393 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
394
395 sock_put(&tsk->sk);
396}
397
398/**
399 * tipc_release - destroy a TIPC socket
400 * @sock: socket to destroy
401 *
402 * This routine cleans up any messages that are still queued on the socket.
403 * For DGRAM and RDM socket types, all queued messages are rejected.
404 * For SEQPACKET and STREAM socket types, the first message is rejected
405 * and any others are discarded. (If the first message on a STREAM socket
406 * is partially-read, it is discarded and the next one is rejected instead.)
407 *
408 * NOTE: Rejected messages are not necessarily returned to the sender! They
409 * are returned or discarded according to the "destination droppable" setting
410 * specified for the message by the sender.
411 *
412 * Returns 0 on success, errno otherwise
413 */
414static int tipc_release(struct socket *sock)
415{
416 struct sock *sk = sock->sk;
417 struct net *net;
418 struct tipc_sock *tsk;
419 struct sk_buff *skb;
420 u32 dnode;
421
422 /*
423 * Exit if socket isn't fully initialized (occurs when a failed accept()
424 * releases a pre-allocated child socket that was never used)
425 */
426 if (sk == NULL)
427 return 0;
428
429 net = sock_net(sk);
430 tsk = tipc_sk(sk);
431 lock_sock(sk);
432
433 /*
434 * Reject all unreceived messages, except on an active connection
435 * (which disconnects locally & sends a 'FIN+' to peer)
436 */
437 dnode = tsk_peer_node(tsk);
438 while (sock->state != SS_DISCONNECTING) {
439 skb = __skb_dequeue(&sk->sk_receive_queue);
440 if (skb == NULL)
441 break;
442 if (TIPC_SKB_CB(skb)->handle != NULL)
443 kfree_skb(skb);
444 else {
445 if ((sock->state == SS_CONNECTING) ||
446 (sock->state == SS_CONNECTED)) {
447 sock->state = SS_DISCONNECTING;
448 tsk->connected = 0;
449 tipc_node_remove_conn(net, dnode, tsk->portid);
450 }
451 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
452 }
453 }
454
455 tipc_sk_withdraw(tsk, 0, NULL);
456 sk_stop_timer(sk, &sk->sk_timer);
457 tipc_sk_remove(tsk);
458 if (tsk->connected) {
459 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
460 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
461 tsk_own_node(tsk), tsk_peer_port(tsk),
462 tsk->portid, TIPC_ERR_NO_PORT);
463 if (skb)
464 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
465 tipc_node_remove_conn(net, dnode, tsk->portid);
466 }
467
468 /* Reject any messages that accumulated in backlog queue */
469 sock->state = SS_DISCONNECTING;
470 release_sock(sk);
471
472 call_rcu(&tsk->rcu, tipc_sk_callback);
473 sock->sk = NULL;
474
475 return 0;
476}
477
478/**
479 * tipc_bind - associate or disassocate TIPC name(s) with a socket
480 * @sock: socket structure
481 * @uaddr: socket address describing name(s) and desired operation
482 * @uaddr_len: size of socket address data structure
483 *
484 * Name and name sequence binding is indicated using a positive scope value;
485 * a negative scope value unbinds the specified name. Specifying no name
486 * (i.e. a socket address length of 0) unbinds all names from the socket.
487 *
488 * Returns 0 on success, errno otherwise
489 *
490 * NOTE: This routine doesn't need to take the socket lock since it doesn't
491 * access any non-constant socket information.
492 */
493static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
494 int uaddr_len)
495{
496 struct sock *sk = sock->sk;
497 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
498 struct tipc_sock *tsk = tipc_sk(sk);
499 int res = -EINVAL;
500
501 lock_sock(sk);
502 if (unlikely(!uaddr_len)) {
503 res = tipc_sk_withdraw(tsk, 0, NULL);
504 goto exit;
505 }
506
507 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
508 res = -EINVAL;
509 goto exit;
510 }
511 if (addr->family != AF_TIPC) {
512 res = -EAFNOSUPPORT;
513 goto exit;
514 }
515
516 if (addr->addrtype == TIPC_ADDR_NAME)
517 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
518 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
519 res = -EAFNOSUPPORT;
520 goto exit;
521 }
522
523 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
524 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
525 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
526 res = -EACCES;
527 goto exit;
528 }
529
530 res = (addr->scope > 0) ?
531 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
532 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
533exit:
534 release_sock(sk);
535 return res;
536}
537
538/**
539 * tipc_getname - get port ID of socket or peer socket
540 * @sock: socket structure
541 * @uaddr: area for returned socket address
542 * @uaddr_len: area for returned length of socket address
543 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
544 *
545 * Returns 0 on success, errno otherwise
546 *
547 * NOTE: This routine doesn't need to take the socket lock since it only
548 * accesses socket information that is unchanging (or which changes in
549 * a completely predictable manner).
550 */
551static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
552 int *uaddr_len, int peer)
553{
554 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
555 struct tipc_sock *tsk = tipc_sk(sock->sk);
556 struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id);
557
558 memset(addr, 0, sizeof(*addr));
559 if (peer) {
560 if ((sock->state != SS_CONNECTED) &&
561 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
562 return -ENOTCONN;
563 addr->addr.id.ref = tsk_peer_port(tsk);
564 addr->addr.id.node = tsk_peer_node(tsk);
565 } else {
566 addr->addr.id.ref = tsk->portid;
567 addr->addr.id.node = tn->own_addr;
568 }
569
570 *uaddr_len = sizeof(*addr);
571 addr->addrtype = TIPC_ADDR_ID;
572 addr->family = AF_TIPC;
573 addr->scope = 0;
574 addr->addr.name.domain = 0;
575
576 return 0;
577}
578
579/**
580 * tipc_poll - read and possibly block on pollmask
581 * @file: file structure associated with the socket
582 * @sock: socket for which to calculate the poll bits
583 * @wait: ???
584 *
585 * Returns pollmask value
586 *
587 * COMMENTARY:
588 * It appears that the usual socket locking mechanisms are not useful here
589 * since the pollmask info is potentially out-of-date the moment this routine
590 * exits. TCP and other protocols seem to rely on higher level poll routines
591 * to handle any preventable race conditions, so TIPC will do the same ...
592 *
593 * TIPC sets the returned events as follows:
594 *
595 * socket state flags set
596 * ------------ ---------
597 * unconnected no read flags
598 * POLLOUT if port is not congested
599 *
600 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
601 * no write flags
602 *
603 * connected POLLIN/POLLRDNORM if data in rx queue
604 * POLLOUT if port is not congested
605 *
606 * disconnecting POLLIN/POLLRDNORM/POLLHUP
607 * no write flags
608 *
609 * listening POLLIN if SYN in rx queue
610 * no write flags
611 *
612 * ready POLLIN/POLLRDNORM if data in rx queue
613 * [connectionless] POLLOUT (since port cannot be congested)
614 *
615 * IMPORTANT: The fact that a read or write operation is indicated does NOT
616 * imply that the operation will succeed, merely that it should be performed
617 * and will not block.
618 */
619static unsigned int tipc_poll(struct file *file, struct socket *sock,
620 poll_table *wait)
621{
622 struct sock *sk = sock->sk;
623 struct tipc_sock *tsk = tipc_sk(sk);
624 u32 mask = 0;
625
626 sock_poll_wait(file, sk_sleep(sk), wait);
627
628 switch ((int)sock->state) {
629 case SS_UNCONNECTED:
630 if (!tsk->link_cong)
631 mask |= POLLOUT;
632 break;
633 case SS_READY:
634 case SS_CONNECTED:
635 if (!tsk->link_cong && !tsk_conn_cong(tsk))
636 mask |= POLLOUT;
637 /* fall thru' */
638 case SS_CONNECTING:
639 case SS_LISTENING:
640 if (!skb_queue_empty(&sk->sk_receive_queue))
641 mask |= (POLLIN | POLLRDNORM);
642 break;
643 case SS_DISCONNECTING:
644 mask = (POLLIN | POLLRDNORM | POLLHUP);
645 break;
646 }
647
648 return mask;
649}
650
651/**
652 * tipc_sendmcast - send multicast message
653 * @sock: socket structure
654 * @seq: destination address
655 * @msg: message to send
656 * @dsz: total length of message data
657 * @timeo: timeout to wait for wakeup
658 *
659 * Called from function tipc_sendmsg(), which has done all sanity checks
660 * Returns the number of bytes sent on success, or errno
661 */
662static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
663 struct msghdr *msg, size_t dsz, long timeo)
664{
665 struct sock *sk = sock->sk;
666 struct tipc_sock *tsk = tipc_sk(sk);
667 struct net *net = sock_net(sk);
668 struct tipc_msg *mhdr = &tsk->phdr;
669 struct sk_buff_head pktchain;
670 struct iov_iter save = msg->msg_iter;
671 uint mtu;
672 int rc;
673
674 msg_set_type(mhdr, TIPC_MCAST_MSG);
675 msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
676 msg_set_destport(mhdr, 0);
677 msg_set_destnode(mhdr, 0);
678 msg_set_nametype(mhdr, seq->type);
679 msg_set_namelower(mhdr, seq->lower);
680 msg_set_nameupper(mhdr, seq->upper);
681 msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
682
683 skb_queue_head_init(&pktchain);
684
685new_mtu:
686 mtu = tipc_bcast_get_mtu(net);
687 rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, &pktchain);
688 if (unlikely(rc < 0))
689 return rc;
690
691 do {
692 rc = tipc_bcast_xmit(net, &pktchain);
693 if (likely(!rc))
694 return dsz;
695
696 if (rc == -ELINKCONG) {
697 tsk->link_cong = 1;
698 rc = tipc_wait_for_sndmsg(sock, &timeo);
699 if (!rc)
700 continue;
701 }
702 __skb_queue_purge(&pktchain);
703 if (rc == -EMSGSIZE) {
704 msg->msg_iter = save;
705 goto new_mtu;
706 }
707 break;
708 } while (1);
709 return rc;
710}
711
712/**
713 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
714 * @arrvq: queue with arriving messages, to be cloned after destination lookup
715 * @inputq: queue with cloned messages, delivered to socket after dest lookup
716 *
717 * Multi-threaded: parallel calls with reference to same queues may occur
718 */
719void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
720 struct sk_buff_head *inputq)
721{
722 struct tipc_msg *msg;
723 struct tipc_plist dports;
724 u32 portid;
725 u32 scope = TIPC_CLUSTER_SCOPE;
726 struct sk_buff_head tmpq;
727 uint hsz;
728 struct sk_buff *skb, *_skb;
729
730 __skb_queue_head_init(&tmpq);
731 tipc_plist_init(&dports);
732
733 skb = tipc_skb_peek(arrvq, &inputq->lock);
734 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
735 msg = buf_msg(skb);
736 hsz = skb_headroom(skb) + msg_hdr_sz(msg);
737
738 if (in_own_node(net, msg_orignode(msg)))
739 scope = TIPC_NODE_SCOPE;
740
741 /* Create destination port list and message clones: */
742 tipc_nametbl_mc_translate(net,
743 msg_nametype(msg), msg_namelower(msg),
744 msg_nameupper(msg), scope, &dports);
745 portid = tipc_plist_pop(&dports);
746 for (; portid; portid = tipc_plist_pop(&dports)) {
747 _skb = __pskb_copy(skb, hsz, GFP_ATOMIC);
748 if (_skb) {
749 msg_set_destport(buf_msg(_skb), portid);
750 __skb_queue_tail(&tmpq, _skb);
751 continue;
752 }
753 pr_warn("Failed to clone mcast rcv buffer\n");
754 }
755 /* Append to inputq if not already done by other thread */
756 spin_lock_bh(&inputq->lock);
757 if (skb_peek(arrvq) == skb) {
758 skb_queue_splice_tail_init(&tmpq, inputq);
759 kfree_skb(__skb_dequeue(arrvq));
760 }
761 spin_unlock_bh(&inputq->lock);
762 __skb_queue_purge(&tmpq);
763 kfree_skb(skb);
764 }
765 tipc_sk_rcv(net, inputq);
766}
767
768/**
769 * tipc_sk_proto_rcv - receive a connection mng protocol message
770 * @tsk: receiving socket
771 * @skb: pointer to message buffer.
772 */
773static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb)
774{
775 struct sock *sk = &tsk->sk;
776 struct tipc_msg *hdr = buf_msg(skb);
777 int mtyp = msg_type(hdr);
778 int conn_cong;
779
780 /* Ignore if connection cannot be validated: */
781 if (!tsk_peer_msg(tsk, hdr))
782 goto exit;
783
784 tsk->probing_state = TIPC_CONN_OK;
785
786 if (mtyp == CONN_PROBE) {
787 msg_set_type(hdr, CONN_PROBE_REPLY);
788 tipc_sk_respond(sk, skb, TIPC_OK);
789 return;
790 } else if (mtyp == CONN_ACK) {
791 conn_cong = tsk_conn_cong(tsk);
792 tsk->sent_unacked -= msg_msgcnt(hdr);
793 if (conn_cong)
794 sk->sk_write_space(sk);
795 } else if (mtyp != CONN_PROBE_REPLY) {
796 pr_warn("Received unknown CONN_PROTO msg\n");
797 }
798exit:
799 kfree_skb(skb);
800}
801
802static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
803{
804 struct sock *sk = sock->sk;
805 struct tipc_sock *tsk = tipc_sk(sk);
806 DEFINE_WAIT(wait);
807 int done;
808
809 do {
810 int err = sock_error(sk);
811 if (err)
812 return err;
813 if (sock->state == SS_DISCONNECTING)
814 return -EPIPE;
815 if (!*timeo_p)
816 return -EAGAIN;
817 if (signal_pending(current))
818 return sock_intr_errno(*timeo_p);
819
820 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
821 done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
822 finish_wait(sk_sleep(sk), &wait);
823 } while (!done);
824 return 0;
825}
826
827/**
828 * tipc_sendmsg - send message in connectionless manner
829 * @sock: socket structure
830 * @m: message to send
831 * @dsz: amount of user data to be sent
832 *
833 * Message must have an destination specified explicitly.
834 * Used for SOCK_RDM and SOCK_DGRAM messages,
835 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
836 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
837 *
838 * Returns the number of bytes sent on success, or errno otherwise
839 */
840static int tipc_sendmsg(struct socket *sock,
841 struct msghdr *m, size_t dsz)
842{
843 struct sock *sk = sock->sk;
844 int ret;
845
846 lock_sock(sk);
847 ret = __tipc_sendmsg(sock, m, dsz);
848 release_sock(sk);
849
850 return ret;
851}
852
853static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz)
854{
855 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
856 struct sock *sk = sock->sk;
857 struct tipc_sock *tsk = tipc_sk(sk);
858 struct net *net = sock_net(sk);
859 struct tipc_msg *mhdr = &tsk->phdr;
860 u32 dnode, dport;
861 struct sk_buff_head pktchain;
862 struct sk_buff *skb;
863 struct tipc_name_seq *seq;
864 struct iov_iter save;
865 u32 mtu;
866 long timeo;
867 int rc;
868
869 if (dsz > TIPC_MAX_USER_MSG_SIZE)
870 return -EMSGSIZE;
871 if (unlikely(!dest)) {
872 if (tsk->connected && sock->state == SS_READY)
873 dest = &tsk->remote;
874 else
875 return -EDESTADDRREQ;
876 } else if (unlikely(m->msg_namelen < sizeof(*dest)) ||
877 dest->family != AF_TIPC) {
878 return -EINVAL;
879 }
880 if (unlikely(sock->state != SS_READY)) {
881 if (sock->state == SS_LISTENING)
882 return -EPIPE;
883 if (sock->state != SS_UNCONNECTED)
884 return -EISCONN;
885 if (tsk->published)
886 return -EOPNOTSUPP;
887 if (dest->addrtype == TIPC_ADDR_NAME) {
888 tsk->conn_type = dest->addr.name.name.type;
889 tsk->conn_instance = dest->addr.name.name.instance;
890 }
891 }
892 seq = &dest->addr.nameseq;
893 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
894
895 if (dest->addrtype == TIPC_ADDR_MCAST) {
896 return tipc_sendmcast(sock, seq, m, dsz, timeo);
897 } else if (dest->addrtype == TIPC_ADDR_NAME) {
898 u32 type = dest->addr.name.name.type;
899 u32 inst = dest->addr.name.name.instance;
900 u32 domain = dest->addr.name.domain;
901
902 dnode = domain;
903 msg_set_type(mhdr, TIPC_NAMED_MSG);
904 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
905 msg_set_nametype(mhdr, type);
906 msg_set_nameinst(mhdr, inst);
907 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
908 dport = tipc_nametbl_translate(net, type, inst, &dnode);
909 msg_set_destnode(mhdr, dnode);
910 msg_set_destport(mhdr, dport);
911 if (unlikely(!dport && !dnode))
912 return -EHOSTUNREACH;
913 } else if (dest->addrtype == TIPC_ADDR_ID) {
914 dnode = dest->addr.id.node;
915 msg_set_type(mhdr, TIPC_DIRECT_MSG);
916 msg_set_lookup_scope(mhdr, 0);
917 msg_set_destnode(mhdr, dnode);
918 msg_set_destport(mhdr, dest->addr.id.ref);
919 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
920 }
921
922 skb_queue_head_init(&pktchain);
923 save = m->msg_iter;
924new_mtu:
925 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
926 rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, &pktchain);
927 if (rc < 0)
928 return rc;
929
930 do {
931 skb = skb_peek(&pktchain);
932 TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong;
933 rc = tipc_node_xmit(net, &pktchain, dnode, tsk->portid);
934 if (likely(!rc)) {
935 if (sock->state != SS_READY)
936 sock->state = SS_CONNECTING;
937 return dsz;
938 }
939 if (rc == -ELINKCONG) {
940 tsk->link_cong = 1;
941 rc = tipc_wait_for_sndmsg(sock, &timeo);
942 if (!rc)
943 continue;
944 }
945 __skb_queue_purge(&pktchain);
946 if (rc == -EMSGSIZE) {
947 m->msg_iter = save;
948 goto new_mtu;
949 }
950 break;
951 } while (1);
952
953 return rc;
954}
955
956static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
957{
958 struct sock *sk = sock->sk;
959 struct tipc_sock *tsk = tipc_sk(sk);
960 DEFINE_WAIT(wait);
961 int done;
962
963 do {
964 int err = sock_error(sk);
965 if (err)
966 return err;
967 if (sock->state == SS_DISCONNECTING)
968 return -EPIPE;
969 else if (sock->state != SS_CONNECTED)
970 return -ENOTCONN;
971 if (!*timeo_p)
972 return -EAGAIN;
973 if (signal_pending(current))
974 return sock_intr_errno(*timeo_p);
975
976 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
977 done = sk_wait_event(sk, timeo_p,
978 (!tsk->link_cong &&
979 !tsk_conn_cong(tsk)) ||
980 !tsk->connected);
981 finish_wait(sk_sleep(sk), &wait);
982 } while (!done);
983 return 0;
984}
985
986/**
987 * tipc_send_stream - send stream-oriented data
988 * @sock: socket structure
989 * @m: data to send
990 * @dsz: total length of data to be transmitted
991 *
992 * Used for SOCK_STREAM data.
993 *
994 * Returns the number of bytes sent on success (or partial success),
995 * or errno if no data sent
996 */
997static int tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
998{
999 struct sock *sk = sock->sk;
1000 int ret;
1001
1002 lock_sock(sk);
1003 ret = __tipc_send_stream(sock, m, dsz);
1004 release_sock(sk);
1005
1006 return ret;
1007}
1008
1009static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
1010{
1011 struct sock *sk = sock->sk;
1012 struct net *net = sock_net(sk);
1013 struct tipc_sock *tsk = tipc_sk(sk);
1014 struct tipc_msg *mhdr = &tsk->phdr;
1015 struct sk_buff_head pktchain;
1016 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1017 u32 portid = tsk->portid;
1018 int rc = -EINVAL;
1019 long timeo;
1020 u32 dnode;
1021 uint mtu, send, sent = 0;
1022 struct iov_iter save;
1023
1024 /* Handle implied connection establishment */
1025 if (unlikely(dest)) {
1026 rc = __tipc_sendmsg(sock, m, dsz);
1027 if (dsz && (dsz == rc))
1028 tsk->sent_unacked = 1;
1029 return rc;
1030 }
1031 if (dsz > (uint)INT_MAX)
1032 return -EMSGSIZE;
1033
1034 if (unlikely(sock->state != SS_CONNECTED)) {
1035 if (sock->state == SS_DISCONNECTING)
1036 return -EPIPE;
1037 else
1038 return -ENOTCONN;
1039 }
1040
1041 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1042 dnode = tsk_peer_node(tsk);
1043 skb_queue_head_init(&pktchain);
1044
1045next:
1046 save = m->msg_iter;
1047 mtu = tsk->max_pkt;
1048 send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
1049 rc = tipc_msg_build(mhdr, m, sent, send, mtu, &pktchain);
1050 if (unlikely(rc < 0))
1051 return rc;
1052
1053 do {
1054 if (likely(!tsk_conn_cong(tsk))) {
1055 rc = tipc_node_xmit(net, &pktchain, dnode, portid);
1056 if (likely(!rc)) {
1057 tsk->sent_unacked++;
1058 sent += send;
1059 if (sent == dsz)
1060 return dsz;
1061 goto next;
1062 }
1063 if (rc == -EMSGSIZE) {
1064 __skb_queue_purge(&pktchain);
1065 tsk->max_pkt = tipc_node_get_mtu(net, dnode,
1066 portid);
1067 m->msg_iter = save;
1068 goto next;
1069 }
1070 if (rc != -ELINKCONG)
1071 break;
1072
1073 tsk->link_cong = 1;
1074 }
1075 rc = tipc_wait_for_sndpkt(sock, &timeo);
1076 } while (!rc);
1077
1078 __skb_queue_purge(&pktchain);
1079 return sent ? sent : rc;
1080}
1081
1082/**
1083 * tipc_send_packet - send a connection-oriented message
1084 * @sock: socket structure
1085 * @m: message to send
1086 * @dsz: length of data to be transmitted
1087 *
1088 * Used for SOCK_SEQPACKET messages.
1089 *
1090 * Returns the number of bytes sent on success, or errno otherwise
1091 */
1092static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1093{
1094 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1095 return -EMSGSIZE;
1096
1097 return tipc_send_stream(sock, m, dsz);
1098}
1099
1100/* tipc_sk_finish_conn - complete the setup of a connection
1101 */
1102static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1103 u32 peer_node)
1104{
1105 struct sock *sk = &tsk->sk;
1106 struct net *net = sock_net(sk);
1107 struct tipc_msg *msg = &tsk->phdr;
1108
1109 msg_set_destnode(msg, peer_node);
1110 msg_set_destport(msg, peer_port);
1111 msg_set_type(msg, TIPC_CONN_MSG);
1112 msg_set_lookup_scope(msg, 0);
1113 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1114
1115 tsk->probing_intv = CONN_PROBING_INTERVAL;
1116 tsk->probing_state = TIPC_CONN_OK;
1117 tsk->connected = 1;
1118 sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv);
1119 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1120 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
1121}
1122
1123/**
1124 * set_orig_addr - capture sender's address for received message
1125 * @m: descriptor for message info
1126 * @msg: received message header
1127 *
1128 * Note: Address is not captured if not requested by receiver.
1129 */
1130static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
1131{
1132 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
1133
1134 if (addr) {
1135 addr->family = AF_TIPC;
1136 addr->addrtype = TIPC_ADDR_ID;
1137 memset(&addr->addr, 0, sizeof(addr->addr));
1138 addr->addr.id.ref = msg_origport(msg);
1139 addr->addr.id.node = msg_orignode(msg);
1140 addr->addr.name.domain = 0; /* could leave uninitialized */
1141 addr->scope = 0; /* could leave uninitialized */
1142 m->msg_namelen = sizeof(struct sockaddr_tipc);
1143 }
1144}
1145
1146/**
1147 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1148 * @m: descriptor for message info
1149 * @msg: received message header
1150 * @tsk: TIPC port associated with message
1151 *
1152 * Note: Ancillary data is not captured if not requested by receiver.
1153 *
1154 * Returns 0 if successful, otherwise errno
1155 */
1156static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1157 struct tipc_sock *tsk)
1158{
1159 u32 anc_data[3];
1160 u32 err;
1161 u32 dest_type;
1162 int has_name;
1163 int res;
1164
1165 if (likely(m->msg_controllen == 0))
1166 return 0;
1167
1168 /* Optionally capture errored message object(s) */
1169 err = msg ? msg_errcode(msg) : 0;
1170 if (unlikely(err)) {
1171 anc_data[0] = err;
1172 anc_data[1] = msg_data_sz(msg);
1173 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1174 if (res)
1175 return res;
1176 if (anc_data[1]) {
1177 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1178 msg_data(msg));
1179 if (res)
1180 return res;
1181 }
1182 }
1183
1184 /* Optionally capture message destination object */
1185 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1186 switch (dest_type) {
1187 case TIPC_NAMED_MSG:
1188 has_name = 1;
1189 anc_data[0] = msg_nametype(msg);
1190 anc_data[1] = msg_namelower(msg);
1191 anc_data[2] = msg_namelower(msg);
1192 break;
1193 case TIPC_MCAST_MSG:
1194 has_name = 1;
1195 anc_data[0] = msg_nametype(msg);
1196 anc_data[1] = msg_namelower(msg);
1197 anc_data[2] = msg_nameupper(msg);
1198 break;
1199 case TIPC_CONN_MSG:
1200 has_name = (tsk->conn_type != 0);
1201 anc_data[0] = tsk->conn_type;
1202 anc_data[1] = tsk->conn_instance;
1203 anc_data[2] = tsk->conn_instance;
1204 break;
1205 default:
1206 has_name = 0;
1207 }
1208 if (has_name) {
1209 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1210 if (res)
1211 return res;
1212 }
1213
1214 return 0;
1215}
1216
1217static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
1218{
1219 struct net *net = sock_net(&tsk->sk);
1220 struct sk_buff *skb = NULL;
1221 struct tipc_msg *msg;
1222 u32 peer_port = tsk_peer_port(tsk);
1223 u32 dnode = tsk_peer_node(tsk);
1224
1225 if (!tsk->connected)
1226 return;
1227 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1228 dnode, tsk_own_node(tsk), peer_port,
1229 tsk->portid, TIPC_OK);
1230 if (!skb)
1231 return;
1232 msg = buf_msg(skb);
1233 msg_set_msgcnt(msg, ack);
1234 tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
1235}
1236
1237static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1238{
1239 struct sock *sk = sock->sk;
1240 DEFINE_WAIT(wait);
1241 long timeo = *timeop;
1242 int err;
1243
1244 for (;;) {
1245 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1246 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1247 if (sock->state == SS_DISCONNECTING) {
1248 err = -ENOTCONN;
1249 break;
1250 }
1251 release_sock(sk);
1252 timeo = schedule_timeout(timeo);
1253 lock_sock(sk);
1254 }
1255 err = 0;
1256 if (!skb_queue_empty(&sk->sk_receive_queue))
1257 break;
1258 err = -EAGAIN;
1259 if (!timeo)
1260 break;
1261 err = sock_intr_errno(timeo);
1262 if (signal_pending(current))
1263 break;
1264 }
1265 finish_wait(sk_sleep(sk), &wait);
1266 *timeop = timeo;
1267 return err;
1268}
1269
1270/**
1271 * tipc_recvmsg - receive packet-oriented message
1272 * @m: descriptor for message info
1273 * @buf_len: total size of user buffer area
1274 * @flags: receive flags
1275 *
1276 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1277 * If the complete message doesn't fit in user area, truncate it.
1278 *
1279 * Returns size of returned message data, errno otherwise
1280 */
1281static int tipc_recvmsg(struct socket *sock, struct msghdr *m, size_t buf_len,
1282 int flags)
1283{
1284 struct sock *sk = sock->sk;
1285 struct tipc_sock *tsk = tipc_sk(sk);
1286 struct sk_buff *buf;
1287 struct tipc_msg *msg;
1288 long timeo;
1289 unsigned int sz;
1290 u32 err;
1291 int res;
1292
1293 /* Catch invalid receive requests */
1294 if (unlikely(!buf_len))
1295 return -EINVAL;
1296
1297 lock_sock(sk);
1298
1299 if (unlikely(sock->state == SS_UNCONNECTED)) {
1300 res = -ENOTCONN;
1301 goto exit;
1302 }
1303
1304 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1305restart:
1306
1307 /* Look for a message in receive queue; wait if necessary */
1308 res = tipc_wait_for_rcvmsg(sock, &timeo);
1309 if (res)
1310 goto exit;
1311
1312 /* Look at first message in receive queue */
1313 buf = skb_peek(&sk->sk_receive_queue);
1314 msg = buf_msg(buf);
1315 sz = msg_data_sz(msg);
1316 err = msg_errcode(msg);
1317
1318 /* Discard an empty non-errored message & try again */
1319 if ((!sz) && (!err)) {
1320 tsk_advance_rx_queue(sk);
1321 goto restart;
1322 }
1323
1324 /* Capture sender's address (optional) */
1325 set_orig_addr(m, msg);
1326
1327 /* Capture ancillary data (optional) */
1328 res = tipc_sk_anc_data_recv(m, msg, tsk);
1329 if (res)
1330 goto exit;
1331
1332 /* Capture message data (if valid) & compute return value (always) */
1333 if (!err) {
1334 if (unlikely(buf_len < sz)) {
1335 sz = buf_len;
1336 m->msg_flags |= MSG_TRUNC;
1337 }
1338 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz);
1339 if (res)
1340 goto exit;
1341 res = sz;
1342 } else {
1343 if ((sock->state == SS_READY) ||
1344 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1345 res = 0;
1346 else
1347 res = -ECONNRESET;
1348 }
1349
1350 /* Consume received message (optional) */
1351 if (likely(!(flags & MSG_PEEK))) {
1352 if ((sock->state != SS_READY) &&
1353 (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1354 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1355 tsk->rcv_unacked = 0;
1356 }
1357 tsk_advance_rx_queue(sk);
1358 }
1359exit:
1360 release_sock(sk);
1361 return res;
1362}
1363
1364/**
1365 * tipc_recv_stream - receive stream-oriented data
1366 * @m: descriptor for message info
1367 * @buf_len: total size of user buffer area
1368 * @flags: receive flags
1369 *
1370 * Used for SOCK_STREAM messages only. If not enough data is available
1371 * will optionally wait for more; never truncates data.
1372 *
1373 * Returns size of returned message data, errno otherwise
1374 */
1375static int tipc_recv_stream(struct socket *sock, struct msghdr *m,
1376 size_t buf_len, int flags)
1377{
1378 struct sock *sk = sock->sk;
1379 struct tipc_sock *tsk = tipc_sk(sk);
1380 struct sk_buff *buf;
1381 struct tipc_msg *msg;
1382 long timeo;
1383 unsigned int sz;
1384 int sz_to_copy, target, needed;
1385 int sz_copied = 0;
1386 u32 err;
1387 int res = 0;
1388
1389 /* Catch invalid receive attempts */
1390 if (unlikely(!buf_len))
1391 return -EINVAL;
1392
1393 lock_sock(sk);
1394
1395 if (unlikely(sock->state == SS_UNCONNECTED)) {
1396 res = -ENOTCONN;
1397 goto exit;
1398 }
1399
1400 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1401 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1402
1403restart:
1404 /* Look for a message in receive queue; wait if necessary */
1405 res = tipc_wait_for_rcvmsg(sock, &timeo);
1406 if (res)
1407 goto exit;
1408
1409 /* Look at first message in receive queue */
1410 buf = skb_peek(&sk->sk_receive_queue);
1411 msg = buf_msg(buf);
1412 sz = msg_data_sz(msg);
1413 err = msg_errcode(msg);
1414
1415 /* Discard an empty non-errored message & try again */
1416 if ((!sz) && (!err)) {
1417 tsk_advance_rx_queue(sk);
1418 goto restart;
1419 }
1420
1421 /* Optionally capture sender's address & ancillary data of first msg */
1422 if (sz_copied == 0) {
1423 set_orig_addr(m, msg);
1424 res = tipc_sk_anc_data_recv(m, msg, tsk);
1425 if (res)
1426 goto exit;
1427 }
1428
1429 /* Capture message data (if valid) & compute return value (always) */
1430 if (!err) {
1431 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1432
1433 sz -= offset;
1434 needed = (buf_len - sz_copied);
1435 sz_to_copy = (sz <= needed) ? sz : needed;
1436
1437 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset,
1438 m, sz_to_copy);
1439 if (res)
1440 goto exit;
1441
1442 sz_copied += sz_to_copy;
1443
1444 if (sz_to_copy < sz) {
1445 if (!(flags & MSG_PEEK))
1446 TIPC_SKB_CB(buf)->handle =
1447 (void *)(unsigned long)(offset + sz_to_copy);
1448 goto exit;
1449 }
1450 } else {
1451 if (sz_copied != 0)
1452 goto exit; /* can't add error msg to valid data */
1453
1454 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1455 res = 0;
1456 else
1457 res = -ECONNRESET;
1458 }
1459
1460 /* Consume received message (optional) */
1461 if (likely(!(flags & MSG_PEEK))) {
1462 if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1463 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1464 tsk->rcv_unacked = 0;
1465 }
1466 tsk_advance_rx_queue(sk);
1467 }
1468
1469 /* Loop around if more data is required */
1470 if ((sz_copied < buf_len) && /* didn't get all requested data */
1471 (!skb_queue_empty(&sk->sk_receive_queue) ||
1472 (sz_copied < target)) && /* and more is ready or required */
1473 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1474 (!err)) /* and haven't reached a FIN */
1475 goto restart;
1476
1477exit:
1478 release_sock(sk);
1479 return sz_copied ? sz_copied : res;
1480}
1481
1482/**
1483 * tipc_write_space - wake up thread if port congestion is released
1484 * @sk: socket
1485 */
1486static void tipc_write_space(struct sock *sk)
1487{
1488 struct socket_wq *wq;
1489
1490 rcu_read_lock();
1491 wq = rcu_dereference(sk->sk_wq);
1492 if (skwq_has_sleeper(wq))
1493 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1494 POLLWRNORM | POLLWRBAND);
1495 rcu_read_unlock();
1496}
1497
1498/**
1499 * tipc_data_ready - wake up threads to indicate messages have been received
1500 * @sk: socket
1501 * @len: the length of messages
1502 */
1503static void tipc_data_ready(struct sock *sk)
1504{
1505 struct socket_wq *wq;
1506
1507 rcu_read_lock();
1508 wq = rcu_dereference(sk->sk_wq);
1509 if (skwq_has_sleeper(wq))
1510 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1511 POLLRDNORM | POLLRDBAND);
1512 rcu_read_unlock();
1513}
1514
1515static void tipc_sock_destruct(struct sock *sk)
1516{
1517 __skb_queue_purge(&sk->sk_receive_queue);
1518}
1519
1520/**
1521 * filter_connect - Handle all incoming messages for a connection-based socket
1522 * @tsk: TIPC socket
1523 * @skb: pointer to message buffer. Set to NULL if buffer is consumed
1524 *
1525 * Returns true if everything ok, false otherwise
1526 */
1527static bool filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
1528{
1529 struct sock *sk = &tsk->sk;
1530 struct net *net = sock_net(sk);
1531 struct socket *sock = sk->sk_socket;
1532 struct tipc_msg *hdr = buf_msg(skb);
1533
1534 if (unlikely(msg_mcast(hdr)))
1535 return false;
1536
1537 switch ((int)sock->state) {
1538 case SS_CONNECTED:
1539
1540 /* Accept only connection-based messages sent by peer */
1541 if (unlikely(!tsk_peer_msg(tsk, hdr)))
1542 return false;
1543
1544 if (unlikely(msg_errcode(hdr))) {
1545 sock->state = SS_DISCONNECTING;
1546 tsk->connected = 0;
1547 /* Let timer expire on it's own */
1548 tipc_node_remove_conn(net, tsk_peer_node(tsk),
1549 tsk->portid);
1550 }
1551 return true;
1552
1553 case SS_CONNECTING:
1554
1555 /* Accept only ACK or NACK message */
1556 if (unlikely(!msg_connected(hdr)))
1557 return false;
1558
1559 if (unlikely(msg_errcode(hdr))) {
1560 sock->state = SS_DISCONNECTING;
1561 sk->sk_err = ECONNREFUSED;
1562 return true;
1563 }
1564
1565 if (unlikely(!msg_isdata(hdr))) {
1566 sock->state = SS_DISCONNECTING;
1567 sk->sk_err = EINVAL;
1568 return true;
1569 }
1570
1571 tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr));
1572 msg_set_importance(&tsk->phdr, msg_importance(hdr));
1573 sock->state = SS_CONNECTED;
1574
1575 /* If 'ACK+' message, add to socket receive queue */
1576 if (msg_data_sz(hdr))
1577 return true;
1578
1579 /* If empty 'ACK-' message, wake up sleeping connect() */
1580 if (waitqueue_active(sk_sleep(sk)))
1581 wake_up_interruptible(sk_sleep(sk));
1582
1583 /* 'ACK-' message is neither accepted nor rejected: */
1584 msg_set_dest_droppable(hdr, 1);
1585 return false;
1586
1587 case SS_LISTENING:
1588 case SS_UNCONNECTED:
1589
1590 /* Accept only SYN message */
1591 if (!msg_connected(hdr) && !(msg_errcode(hdr)))
1592 return true;
1593 break;
1594 case SS_DISCONNECTING:
1595 break;
1596 default:
1597 pr_err("Unknown socket state %u\n", sock->state);
1598 }
1599 return false;
1600}
1601
1602/**
1603 * rcvbuf_limit - get proper overload limit of socket receive queue
1604 * @sk: socket
1605 * @buf: message
1606 *
1607 * For all connection oriented messages, irrespective of importance,
1608 * the default overload value (i.e. 67MB) is set as limit.
1609 *
1610 * For all connectionless messages, by default new queue limits are
1611 * as belows:
1612 *
1613 * TIPC_LOW_IMPORTANCE (4 MB)
1614 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1615 * TIPC_HIGH_IMPORTANCE (16 MB)
1616 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1617 *
1618 * Returns overload limit according to corresponding message importance
1619 */
1620static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1621{
1622 struct tipc_msg *msg = buf_msg(buf);
1623
1624 if (msg_connected(msg))
1625 return sysctl_tipc_rmem[2];
1626
1627 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1628 msg_importance(msg);
1629}
1630
1631/**
1632 * filter_rcv - validate incoming message
1633 * @sk: socket
1634 * @skb: pointer to message.
1635 *
1636 * Enqueues message on receive queue if acceptable; optionally handles
1637 * disconnect indication for a connected socket.
1638 *
1639 * Called with socket lock already taken
1640 *
1641 * Returns true if message was added to socket receive queue, otherwise false
1642 */
1643static bool filter_rcv(struct sock *sk, struct sk_buff *skb)
1644{
1645 struct socket *sock = sk->sk_socket;
1646 struct tipc_sock *tsk = tipc_sk(sk);
1647 struct tipc_msg *hdr = buf_msg(skb);
1648 unsigned int limit = rcvbuf_limit(sk, skb);
1649 int err = TIPC_OK;
1650 int usr = msg_user(hdr);
1651
1652 if (unlikely(msg_user(hdr) == CONN_MANAGER)) {
1653 tipc_sk_proto_rcv(tsk, skb);
1654 return false;
1655 }
1656
1657 if (unlikely(usr == SOCK_WAKEUP)) {
1658 kfree_skb(skb);
1659 tsk->link_cong = 0;
1660 sk->sk_write_space(sk);
1661 return false;
1662 }
1663
1664 /* Drop if illegal message type */
1665 if (unlikely(msg_type(hdr) > TIPC_DIRECT_MSG)) {
1666 kfree_skb(skb);
1667 return false;
1668 }
1669
1670 /* Reject if wrong message type for current socket state */
1671 if (unlikely(sock->state == SS_READY)) {
1672 if (msg_connected(hdr)) {
1673 err = TIPC_ERR_NO_PORT;
1674 goto reject;
1675 }
1676 } else if (unlikely(!filter_connect(tsk, skb))) {
1677 err = TIPC_ERR_NO_PORT;
1678 goto reject;
1679 }
1680
1681 /* Reject message if there isn't room to queue it */
1682 if (unlikely(sk_rmem_alloc_get(sk) + skb->truesize >= limit)) {
1683 err = TIPC_ERR_OVERLOAD;
1684 goto reject;
1685 }
1686
1687 /* Enqueue message */
1688 TIPC_SKB_CB(skb)->handle = NULL;
1689 __skb_queue_tail(&sk->sk_receive_queue, skb);
1690 skb_set_owner_r(skb, sk);
1691
1692 sk->sk_data_ready(sk);
1693 return true;
1694
1695reject:
1696 tipc_sk_respond(sk, skb, err);
1697 return false;
1698}
1699
1700/**
1701 * tipc_backlog_rcv - handle incoming message from backlog queue
1702 * @sk: socket
1703 * @skb: message
1704 *
1705 * Caller must hold socket lock
1706 *
1707 * Returns 0
1708 */
1709static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
1710{
1711 unsigned int truesize = skb->truesize;
1712
1713 if (likely(filter_rcv(sk, skb)))
1714 atomic_add(truesize, &tipc_sk(sk)->dupl_rcvcnt);
1715 return 0;
1716}
1717
1718/**
1719 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
1720 * inputq and try adding them to socket or backlog queue
1721 * @inputq: list of incoming buffers with potentially different destinations
1722 * @sk: socket where the buffers should be enqueued
1723 * @dport: port number for the socket
1724 *
1725 * Caller must hold socket lock
1726 */
1727static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
1728 u32 dport)
1729{
1730 unsigned int lim;
1731 atomic_t *dcnt;
1732 struct sk_buff *skb;
1733 unsigned long time_limit = jiffies + 2;
1734
1735 while (skb_queue_len(inputq)) {
1736 if (unlikely(time_after_eq(jiffies, time_limit)))
1737 return;
1738
1739 skb = tipc_skb_dequeue(inputq, dport);
1740 if (unlikely(!skb))
1741 return;
1742
1743 /* Add message directly to receive queue if possible */
1744 if (!sock_owned_by_user(sk)) {
1745 filter_rcv(sk, skb);
1746 continue;
1747 }
1748
1749 /* Try backlog, compensating for double-counted bytes */
1750 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
1751 if (sk->sk_backlog.len)
1752 atomic_set(dcnt, 0);
1753 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
1754 if (likely(!sk_add_backlog(sk, skb, lim)))
1755 continue;
1756
1757 /* Overload => reject message back to sender */
1758 tipc_sk_respond(sk, skb, TIPC_ERR_OVERLOAD);
1759 break;
1760 }
1761}
1762
1763/**
1764 * tipc_sk_rcv - handle a chain of incoming buffers
1765 * @inputq: buffer list containing the buffers
1766 * Consumes all buffers in list until inputq is empty
1767 * Note: may be called in multiple threads referring to the same queue
1768 */
1769void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
1770{
1771 u32 dnode, dport = 0;
1772 int err;
1773 struct tipc_sock *tsk;
1774 struct sock *sk;
1775 struct sk_buff *skb;
1776
1777 while (skb_queue_len(inputq)) {
1778 dport = tipc_skb_peek_port(inputq, dport);
1779 tsk = tipc_sk_lookup(net, dport);
1780
1781 if (likely(tsk)) {
1782 sk = &tsk->sk;
1783 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
1784 tipc_sk_enqueue(inputq, sk, dport);
1785 spin_unlock_bh(&sk->sk_lock.slock);
1786 }
1787 sock_put(sk);
1788 continue;
1789 }
1790
1791 /* No destination socket => dequeue skb if still there */
1792 skb = tipc_skb_dequeue(inputq, dport);
1793 if (!skb)
1794 return;
1795
1796 /* Try secondary lookup if unresolved named message */
1797 err = TIPC_ERR_NO_PORT;
1798 if (tipc_msg_lookup_dest(net, skb, &err))
1799 goto xmit;
1800
1801 /* Prepare for message rejection */
1802 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
1803 continue;
1804xmit:
1805 dnode = msg_destnode(buf_msg(skb));
1806 tipc_node_xmit_skb(net, skb, dnode, dport);
1807 }
1808}
1809
1810static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1811{
1812 struct sock *sk = sock->sk;
1813 DEFINE_WAIT(wait);
1814 int done;
1815
1816 do {
1817 int err = sock_error(sk);
1818 if (err)
1819 return err;
1820 if (!*timeo_p)
1821 return -ETIMEDOUT;
1822 if (signal_pending(current))
1823 return sock_intr_errno(*timeo_p);
1824
1825 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1826 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1827 finish_wait(sk_sleep(sk), &wait);
1828 } while (!done);
1829 return 0;
1830}
1831
1832/**
1833 * tipc_connect - establish a connection to another TIPC port
1834 * @sock: socket structure
1835 * @dest: socket address for destination port
1836 * @destlen: size of socket address data structure
1837 * @flags: file-related flags associated with socket
1838 *
1839 * Returns 0 on success, errno otherwise
1840 */
1841static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1842 int destlen, int flags)
1843{
1844 struct sock *sk = sock->sk;
1845 struct tipc_sock *tsk = tipc_sk(sk);
1846 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1847 struct msghdr m = {NULL,};
1848 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
1849 socket_state previous;
1850 int res = 0;
1851
1852 lock_sock(sk);
1853
1854 /* DGRAM/RDM connect(), just save the destaddr */
1855 if (sock->state == SS_READY) {
1856 if (dst->family == AF_UNSPEC) {
1857 memset(&tsk->remote, 0, sizeof(struct sockaddr_tipc));
1858 tsk->connected = 0;
1859 } else if (destlen != sizeof(struct sockaddr_tipc)) {
1860 res = -EINVAL;
1861 } else {
1862 memcpy(&tsk->remote, dest, destlen);
1863 tsk->connected = 1;
1864 }
1865 goto exit;
1866 }
1867
1868 /*
1869 * Reject connection attempt using multicast address
1870 *
1871 * Note: send_msg() validates the rest of the address fields,
1872 * so there's no need to do it here
1873 */
1874 if (dst->addrtype == TIPC_ADDR_MCAST) {
1875 res = -EINVAL;
1876 goto exit;
1877 }
1878
1879 previous = sock->state;
1880 switch (sock->state) {
1881 case SS_UNCONNECTED:
1882 /* Send a 'SYN-' to destination */
1883 m.msg_name = dest;
1884 m.msg_namelen = destlen;
1885
1886 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1887 * indicate send_msg() is never blocked.
1888 */
1889 if (!timeout)
1890 m.msg_flags = MSG_DONTWAIT;
1891
1892 res = __tipc_sendmsg(sock, &m, 0);
1893 if ((res < 0) && (res != -EWOULDBLOCK))
1894 goto exit;
1895
1896 /* Just entered SS_CONNECTING state; the only
1897 * difference is that return value in non-blocking
1898 * case is EINPROGRESS, rather than EALREADY.
1899 */
1900 res = -EINPROGRESS;
1901 case SS_CONNECTING:
1902 if (previous == SS_CONNECTING)
1903 res = -EALREADY;
1904 if (!timeout)
1905 goto exit;
1906 timeout = msecs_to_jiffies(timeout);
1907 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1908 res = tipc_wait_for_connect(sock, &timeout);
1909 break;
1910 case SS_CONNECTED:
1911 res = -EISCONN;
1912 break;
1913 default:
1914 res = -EINVAL;
1915 break;
1916 }
1917exit:
1918 release_sock(sk);
1919 return res;
1920}
1921
1922/**
1923 * tipc_listen - allow socket to listen for incoming connections
1924 * @sock: socket structure
1925 * @len: (unused)
1926 *
1927 * Returns 0 on success, errno otherwise
1928 */
1929static int tipc_listen(struct socket *sock, int len)
1930{
1931 struct sock *sk = sock->sk;
1932 int res;
1933
1934 lock_sock(sk);
1935
1936 if (sock->state != SS_UNCONNECTED)
1937 res = -EINVAL;
1938 else {
1939 sock->state = SS_LISTENING;
1940 res = 0;
1941 }
1942
1943 release_sock(sk);
1944 return res;
1945}
1946
1947static int tipc_wait_for_accept(struct socket *sock, long timeo)
1948{
1949 struct sock *sk = sock->sk;
1950 DEFINE_WAIT(wait);
1951 int err;
1952
1953 /* True wake-one mechanism for incoming connections: only
1954 * one process gets woken up, not the 'whole herd'.
1955 * Since we do not 'race & poll' for established sockets
1956 * anymore, the common case will execute the loop only once.
1957 */
1958 for (;;) {
1959 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1960 TASK_INTERRUPTIBLE);
1961 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1962 release_sock(sk);
1963 timeo = schedule_timeout(timeo);
1964 lock_sock(sk);
1965 }
1966 err = 0;
1967 if (!skb_queue_empty(&sk->sk_receive_queue))
1968 break;
1969 err = -EINVAL;
1970 if (sock->state != SS_LISTENING)
1971 break;
1972 err = -EAGAIN;
1973 if (!timeo)
1974 break;
1975 err = sock_intr_errno(timeo);
1976 if (signal_pending(current))
1977 break;
1978 }
1979 finish_wait(sk_sleep(sk), &wait);
1980 return err;
1981}
1982
1983/**
1984 * tipc_accept - wait for connection request
1985 * @sock: listening socket
1986 * @newsock: new socket that is to be connected
1987 * @flags: file-related flags associated with socket
1988 *
1989 * Returns 0 on success, errno otherwise
1990 */
1991static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1992{
1993 struct sock *new_sk, *sk = sock->sk;
1994 struct sk_buff *buf;
1995 struct tipc_sock *new_tsock;
1996 struct tipc_msg *msg;
1997 long timeo;
1998 int res;
1999
2000 lock_sock(sk);
2001
2002 if (sock->state != SS_LISTENING) {
2003 res = -EINVAL;
2004 goto exit;
2005 }
2006 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2007 res = tipc_wait_for_accept(sock, timeo);
2008 if (res)
2009 goto exit;
2010
2011 buf = skb_peek(&sk->sk_receive_queue);
2012
2013 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
2014 if (res)
2015 goto exit;
2016 security_sk_clone(sock->sk, new_sock->sk);
2017
2018 new_sk = new_sock->sk;
2019 new_tsock = tipc_sk(new_sk);
2020 msg = buf_msg(buf);
2021
2022 /* we lock on new_sk; but lockdep sees the lock on sk */
2023 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2024
2025 /*
2026 * Reject any stray messages received by new socket
2027 * before the socket lock was taken (very, very unlikely)
2028 */
2029 tsk_rej_rx_queue(new_sk);
2030
2031 /* Connect new socket to it's peer */
2032 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2033 new_sock->state = SS_CONNECTED;
2034
2035 tsk_set_importance(new_tsock, msg_importance(msg));
2036 if (msg_named(msg)) {
2037 new_tsock->conn_type = msg_nametype(msg);
2038 new_tsock->conn_instance = msg_nameinst(msg);
2039 }
2040
2041 /*
2042 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2043 * Respond to 'SYN+' by queuing it on new socket.
2044 */
2045 if (!msg_data_sz(msg)) {
2046 struct msghdr m = {NULL,};
2047
2048 tsk_advance_rx_queue(sk);
2049 __tipc_send_stream(new_sock, &m, 0);
2050 } else {
2051 __skb_dequeue(&sk->sk_receive_queue);
2052 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2053 skb_set_owner_r(buf, new_sk);
2054 }
2055 release_sock(new_sk);
2056exit:
2057 release_sock(sk);
2058 return res;
2059}
2060
2061/**
2062 * tipc_shutdown - shutdown socket connection
2063 * @sock: socket structure
2064 * @how: direction to close (must be SHUT_RDWR)
2065 *
2066 * Terminates connection (if necessary), then purges socket's receive queue.
2067 *
2068 * Returns 0 on success, errno otherwise
2069 */
2070static int tipc_shutdown(struct socket *sock, int how)
2071{
2072 struct sock *sk = sock->sk;
2073 struct net *net = sock_net(sk);
2074 struct tipc_sock *tsk = tipc_sk(sk);
2075 struct sk_buff *skb;
2076 u32 dnode = tsk_peer_node(tsk);
2077 u32 dport = tsk_peer_port(tsk);
2078 u32 onode = tipc_own_addr(net);
2079 u32 oport = tsk->portid;
2080 int res;
2081
2082 if (how != SHUT_RDWR)
2083 return -EINVAL;
2084
2085 lock_sock(sk);
2086
2087 switch (sock->state) {
2088 case SS_CONNECTING:
2089 case SS_CONNECTED:
2090
2091restart:
2092 dnode = tsk_peer_node(tsk);
2093
2094 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
2095 skb = __skb_dequeue(&sk->sk_receive_queue);
2096 if (skb) {
2097 if (TIPC_SKB_CB(skb)->handle != NULL) {
2098 kfree_skb(skb);
2099 goto restart;
2100 }
2101 tipc_sk_respond(sk, skb, TIPC_CONN_SHUTDOWN);
2102 } else {
2103 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2104 TIPC_CONN_MSG, SHORT_H_SIZE,
2105 0, dnode, onode, dport, oport,
2106 TIPC_CONN_SHUTDOWN);
2107 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
2108 }
2109 tsk->connected = 0;
2110 sock->state = SS_DISCONNECTING;
2111 tipc_node_remove_conn(net, dnode, tsk->portid);
2112 /* fall through */
2113
2114 case SS_DISCONNECTING:
2115
2116 /* Discard any unreceived messages */
2117 __skb_queue_purge(&sk->sk_receive_queue);
2118
2119 /* Wake up anyone sleeping in poll */
2120 sk->sk_state_change(sk);
2121 res = 0;
2122 break;
2123
2124 default:
2125 res = -ENOTCONN;
2126 }
2127
2128 release_sock(sk);
2129 return res;
2130}
2131
2132static void tipc_sk_timeout(unsigned long data)
2133{
2134 struct tipc_sock *tsk = (struct tipc_sock *)data;
2135 struct sock *sk = &tsk->sk;
2136 struct sk_buff *skb = NULL;
2137 u32 peer_port, peer_node;
2138 u32 own_node = tsk_own_node(tsk);
2139
2140 bh_lock_sock(sk);
2141 if (!tsk->connected) {
2142 bh_unlock_sock(sk);
2143 goto exit;
2144 }
2145 peer_port = tsk_peer_port(tsk);
2146 peer_node = tsk_peer_node(tsk);
2147
2148 if (tsk->probing_state == TIPC_CONN_PROBING) {
2149 if (!sock_owned_by_user(sk)) {
2150 sk->sk_socket->state = SS_DISCONNECTING;
2151 tsk->connected = 0;
2152 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
2153 tsk_peer_port(tsk));
2154 sk->sk_state_change(sk);
2155 } else {
2156 /* Try again later */
2157 sk_reset_timer(sk, &sk->sk_timer, (HZ / 20));
2158 }
2159
2160 } else {
2161 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE,
2162 INT_H_SIZE, 0, peer_node, own_node,
2163 peer_port, tsk->portid, TIPC_OK);
2164 tsk->probing_state = TIPC_CONN_PROBING;
2165 sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv);
2166 }
2167 bh_unlock_sock(sk);
2168 if (skb)
2169 tipc_node_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid);
2170exit:
2171 sock_put(sk);
2172}
2173
2174static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2175 struct tipc_name_seq const *seq)
2176{
2177 struct net *net = sock_net(&tsk->sk);
2178 struct publication *publ;
2179 u32 key;
2180
2181 if (tsk->connected)
2182 return -EINVAL;
2183 key = tsk->portid + tsk->pub_count + 1;
2184 if (key == tsk->portid)
2185 return -EADDRINUSE;
2186
2187 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2188 scope, tsk->portid, key);
2189 if (unlikely(!publ))
2190 return -EINVAL;
2191
2192 list_add(&publ->pport_list, &tsk->publications);
2193 tsk->pub_count++;
2194 tsk->published = 1;
2195 return 0;
2196}
2197
2198static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2199 struct tipc_name_seq const *seq)
2200{
2201 struct net *net = sock_net(&tsk->sk);
2202 struct publication *publ;
2203 struct publication *safe;
2204 int rc = -EINVAL;
2205
2206 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2207 if (seq) {
2208 if (publ->scope != scope)
2209 continue;
2210 if (publ->type != seq->type)
2211 continue;
2212 if (publ->lower != seq->lower)
2213 continue;
2214 if (publ->upper != seq->upper)
2215 break;
2216 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2217 publ->ref, publ->key);
2218 rc = 0;
2219 break;
2220 }
2221 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2222 publ->ref, publ->key);
2223 rc = 0;
2224 }
2225 if (list_empty(&tsk->publications))
2226 tsk->published = 0;
2227 return rc;
2228}
2229
2230/* tipc_sk_reinit: set non-zero address in all existing sockets
2231 * when we go from standalone to network mode.
2232 */
2233void tipc_sk_reinit(struct net *net)
2234{
2235 struct tipc_net *tn = net_generic(net, tipc_net_id);
2236 const struct bucket_table *tbl;
2237 struct rhash_head *pos;
2238 struct tipc_sock *tsk;
2239 struct tipc_msg *msg;
2240 int i;
2241
2242 rcu_read_lock();
2243 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
2244 for (i = 0; i < tbl->size; i++) {
2245 rht_for_each_entry_rcu(tsk, pos, tbl, i, node) {
2246 spin_lock_bh(&tsk->sk.sk_lock.slock);
2247 msg = &tsk->phdr;
2248 msg_set_prevnode(msg, tn->own_addr);
2249 msg_set_orignode(msg, tn->own_addr);
2250 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2251 }
2252 }
2253 rcu_read_unlock();
2254}
2255
2256static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2257{
2258 struct tipc_net *tn = net_generic(net, tipc_net_id);
2259 struct tipc_sock *tsk;
2260
2261 rcu_read_lock();
2262 tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
2263 if (tsk)
2264 sock_hold(&tsk->sk);
2265 rcu_read_unlock();
2266
2267 return tsk;
2268}
2269
2270static int tipc_sk_insert(struct tipc_sock *tsk)
2271{
2272 struct sock *sk = &tsk->sk;
2273 struct net *net = sock_net(sk);
2274 struct tipc_net *tn = net_generic(net, tipc_net_id);
2275 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2276 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2277
2278 while (remaining--) {
2279 portid++;
2280 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2281 portid = TIPC_MIN_PORT;
2282 tsk->portid = portid;
2283 sock_hold(&tsk->sk);
2284 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2285 tsk_rht_params))
2286 return 0;
2287 sock_put(&tsk->sk);
2288 }
2289
2290 return -1;
2291}
2292
2293static void tipc_sk_remove(struct tipc_sock *tsk)
2294{
2295 struct sock *sk = &tsk->sk;
2296 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
2297
2298 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
2299 WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
2300 __sock_put(sk);
2301 }
2302}
2303
2304static const struct rhashtable_params tsk_rht_params = {
2305 .nelem_hint = 192,
2306 .head_offset = offsetof(struct tipc_sock, node),
2307 .key_offset = offsetof(struct tipc_sock, portid),
2308 .key_len = sizeof(u32), /* portid */
2309 .max_size = 1048576,
2310 .min_size = 256,
2311 .automatic_shrinking = true,
2312};
2313
2314int tipc_sk_rht_init(struct net *net)
2315{
2316 struct tipc_net *tn = net_generic(net, tipc_net_id);
2317
2318 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
2319}
2320
2321void tipc_sk_rht_destroy(struct net *net)
2322{
2323 struct tipc_net *tn = net_generic(net, tipc_net_id);
2324
2325 /* Wait for socket readers to complete */
2326 synchronize_net();
2327
2328 rhashtable_destroy(&tn->sk_rht);
2329}
2330
2331/**
2332 * tipc_setsockopt - set socket option
2333 * @sock: socket structure
2334 * @lvl: option level
2335 * @opt: option identifier
2336 * @ov: pointer to new option value
2337 * @ol: length of option value
2338 *
2339 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2340 * (to ease compatibility).
2341 *
2342 * Returns 0 on success, errno otherwise
2343 */
2344static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2345 char __user *ov, unsigned int ol)
2346{
2347 struct sock *sk = sock->sk;
2348 struct tipc_sock *tsk = tipc_sk(sk);
2349 u32 value;
2350 int res;
2351
2352 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2353 return 0;
2354 if (lvl != SOL_TIPC)
2355 return -ENOPROTOOPT;
2356 if (ol < sizeof(value))
2357 return -EINVAL;
2358 res = get_user(value, (u32 __user *)ov);
2359 if (res)
2360 return res;
2361
2362 lock_sock(sk);
2363
2364 switch (opt) {
2365 case TIPC_IMPORTANCE:
2366 res = tsk_set_importance(tsk, value);
2367 break;
2368 case TIPC_SRC_DROPPABLE:
2369 if (sock->type != SOCK_STREAM)
2370 tsk_set_unreliable(tsk, value);
2371 else
2372 res = -ENOPROTOOPT;
2373 break;
2374 case TIPC_DEST_DROPPABLE:
2375 tsk_set_unreturnable(tsk, value);
2376 break;
2377 case TIPC_CONN_TIMEOUT:
2378 tipc_sk(sk)->conn_timeout = value;
2379 /* no need to set "res", since already 0 at this point */
2380 break;
2381 default:
2382 res = -EINVAL;
2383 }
2384
2385 release_sock(sk);
2386
2387 return res;
2388}
2389
2390/**
2391 * tipc_getsockopt - get socket option
2392 * @sock: socket structure
2393 * @lvl: option level
2394 * @opt: option identifier
2395 * @ov: receptacle for option value
2396 * @ol: receptacle for length of option value
2397 *
2398 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2399 * (to ease compatibility).
2400 *
2401 * Returns 0 on success, errno otherwise
2402 */
2403static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2404 char __user *ov, int __user *ol)
2405{
2406 struct sock *sk = sock->sk;
2407 struct tipc_sock *tsk = tipc_sk(sk);
2408 int len;
2409 u32 value;
2410 int res;
2411
2412 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2413 return put_user(0, ol);
2414 if (lvl != SOL_TIPC)
2415 return -ENOPROTOOPT;
2416 res = get_user(len, ol);
2417 if (res)
2418 return res;
2419
2420 lock_sock(sk);
2421
2422 switch (opt) {
2423 case TIPC_IMPORTANCE:
2424 value = tsk_importance(tsk);
2425 break;
2426 case TIPC_SRC_DROPPABLE:
2427 value = tsk_unreliable(tsk);
2428 break;
2429 case TIPC_DEST_DROPPABLE:
2430 value = tsk_unreturnable(tsk);
2431 break;
2432 case TIPC_CONN_TIMEOUT:
2433 value = tsk->conn_timeout;
2434 /* no need to set "res", since already 0 at this point */
2435 break;
2436 case TIPC_NODE_RECVQ_DEPTH:
2437 value = 0; /* was tipc_queue_size, now obsolete */
2438 break;
2439 case TIPC_SOCK_RECVQ_DEPTH:
2440 value = skb_queue_len(&sk->sk_receive_queue);
2441 break;
2442 default:
2443 res = -EINVAL;
2444 }
2445
2446 release_sock(sk);
2447
2448 if (res)
2449 return res; /* "get" failed */
2450
2451 if (len < sizeof(value))
2452 return -EINVAL;
2453
2454 if (copy_to_user(ov, &value, sizeof(value)))
2455 return -EFAULT;
2456
2457 return put_user(sizeof(value), ol);
2458}
2459
2460static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2461{
2462 struct sock *sk = sock->sk;
2463 struct tipc_sioc_ln_req lnr;
2464 void __user *argp = (void __user *)arg;
2465
2466 switch (cmd) {
2467 case SIOCGETLINKNAME:
2468 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2469 return -EFAULT;
2470 if (!tipc_node_get_linkname(sock_net(sk),
2471 lnr.bearer_id & 0xffff, lnr.peer,
2472 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2473 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2474 return -EFAULT;
2475 return 0;
2476 }
2477 return -EADDRNOTAVAIL;
2478 default:
2479 return -ENOIOCTLCMD;
2480 }
2481}
2482
2483/* Protocol switches for the various types of TIPC sockets */
2484
2485static const struct proto_ops msg_ops = {
2486 .owner = THIS_MODULE,
2487 .family = AF_TIPC,
2488 .release = tipc_release,
2489 .bind = tipc_bind,
2490 .connect = tipc_connect,
2491 .socketpair = sock_no_socketpair,
2492 .accept = sock_no_accept,
2493 .getname = tipc_getname,
2494 .poll = tipc_poll,
2495 .ioctl = tipc_ioctl,
2496 .listen = sock_no_listen,
2497 .shutdown = tipc_shutdown,
2498 .setsockopt = tipc_setsockopt,
2499 .getsockopt = tipc_getsockopt,
2500 .sendmsg = tipc_sendmsg,
2501 .recvmsg = tipc_recvmsg,
2502 .mmap = sock_no_mmap,
2503 .sendpage = sock_no_sendpage
2504};
2505
2506static const struct proto_ops packet_ops = {
2507 .owner = THIS_MODULE,
2508 .family = AF_TIPC,
2509 .release = tipc_release,
2510 .bind = tipc_bind,
2511 .connect = tipc_connect,
2512 .socketpair = sock_no_socketpair,
2513 .accept = tipc_accept,
2514 .getname = tipc_getname,
2515 .poll = tipc_poll,
2516 .ioctl = tipc_ioctl,
2517 .listen = tipc_listen,
2518 .shutdown = tipc_shutdown,
2519 .setsockopt = tipc_setsockopt,
2520 .getsockopt = tipc_getsockopt,
2521 .sendmsg = tipc_send_packet,
2522 .recvmsg = tipc_recvmsg,
2523 .mmap = sock_no_mmap,
2524 .sendpage = sock_no_sendpage
2525};
2526
2527static const struct proto_ops stream_ops = {
2528 .owner = THIS_MODULE,
2529 .family = AF_TIPC,
2530 .release = tipc_release,
2531 .bind = tipc_bind,
2532 .connect = tipc_connect,
2533 .socketpair = sock_no_socketpair,
2534 .accept = tipc_accept,
2535 .getname = tipc_getname,
2536 .poll = tipc_poll,
2537 .ioctl = tipc_ioctl,
2538 .listen = tipc_listen,
2539 .shutdown = tipc_shutdown,
2540 .setsockopt = tipc_setsockopt,
2541 .getsockopt = tipc_getsockopt,
2542 .sendmsg = tipc_send_stream,
2543 .recvmsg = tipc_recv_stream,
2544 .mmap = sock_no_mmap,
2545 .sendpage = sock_no_sendpage
2546};
2547
2548static const struct net_proto_family tipc_family_ops = {
2549 .owner = THIS_MODULE,
2550 .family = AF_TIPC,
2551 .create = tipc_sk_create
2552};
2553
2554static struct proto tipc_proto = {
2555 .name = "TIPC",
2556 .owner = THIS_MODULE,
2557 .obj_size = sizeof(struct tipc_sock),
2558 .sysctl_rmem = sysctl_tipc_rmem
2559};
2560
2561/**
2562 * tipc_socket_init - initialize TIPC socket interface
2563 *
2564 * Returns 0 on success, errno otherwise
2565 */
2566int tipc_socket_init(void)
2567{
2568 int res;
2569
2570 res = proto_register(&tipc_proto, 1);
2571 if (res) {
2572 pr_err("Failed to register TIPC protocol type\n");
2573 goto out;
2574 }
2575
2576 res = sock_register(&tipc_family_ops);
2577 if (res) {
2578 pr_err("Failed to register TIPC socket type\n");
2579 proto_unregister(&tipc_proto);
2580 goto out;
2581 }
2582 out:
2583 return res;
2584}
2585
2586/**
2587 * tipc_socket_stop - stop TIPC socket interface
2588 */
2589void tipc_socket_stop(void)
2590{
2591 sock_unregister(tipc_family_ops.family);
2592 proto_unregister(&tipc_proto);
2593}
2594
2595/* Caller should hold socket lock for the passed tipc socket. */
2596static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
2597{
2598 u32 peer_node;
2599 u32 peer_port;
2600 struct nlattr *nest;
2601
2602 peer_node = tsk_peer_node(tsk);
2603 peer_port = tsk_peer_port(tsk);
2604
2605 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
2606
2607 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
2608 goto msg_full;
2609 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
2610 goto msg_full;
2611
2612 if (tsk->conn_type != 0) {
2613 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
2614 goto msg_full;
2615 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
2616 goto msg_full;
2617 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
2618 goto msg_full;
2619 }
2620 nla_nest_end(skb, nest);
2621
2622 return 0;
2623
2624msg_full:
2625 nla_nest_cancel(skb, nest);
2626
2627 return -EMSGSIZE;
2628}
2629
2630/* Caller should hold socket lock for the passed tipc socket. */
2631static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
2632 struct tipc_sock *tsk)
2633{
2634 int err;
2635 void *hdr;
2636 struct nlattr *attrs;
2637 struct net *net = sock_net(skb->sk);
2638 struct tipc_net *tn = net_generic(net, tipc_net_id);
2639
2640 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2641 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
2642 if (!hdr)
2643 goto msg_cancel;
2644
2645 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
2646 if (!attrs)
2647 goto genlmsg_cancel;
2648 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid))
2649 goto attr_msg_cancel;
2650 if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr))
2651 goto attr_msg_cancel;
2652
2653 if (tsk->connected) {
2654 err = __tipc_nl_add_sk_con(skb, tsk);
2655 if (err)
2656 goto attr_msg_cancel;
2657 } else if (!list_empty(&tsk->publications)) {
2658 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
2659 goto attr_msg_cancel;
2660 }
2661 nla_nest_end(skb, attrs);
2662 genlmsg_end(skb, hdr);
2663
2664 return 0;
2665
2666attr_msg_cancel:
2667 nla_nest_cancel(skb, attrs);
2668genlmsg_cancel:
2669 genlmsg_cancel(skb, hdr);
2670msg_cancel:
2671 return -EMSGSIZE;
2672}
2673
2674int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
2675{
2676 int err;
2677 struct tipc_sock *tsk;
2678 const struct bucket_table *tbl;
2679 struct rhash_head *pos;
2680 struct net *net = sock_net(skb->sk);
2681 struct tipc_net *tn = net_generic(net, tipc_net_id);
2682 u32 tbl_id = cb->args[0];
2683 u32 prev_portid = cb->args[1];
2684
2685 rcu_read_lock();
2686 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
2687 for (; tbl_id < tbl->size; tbl_id++) {
2688 rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) {
2689 spin_lock_bh(&tsk->sk.sk_lock.slock);
2690 if (prev_portid && prev_portid != tsk->portid) {
2691 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2692 continue;
2693 }
2694
2695 err = __tipc_nl_add_sk(skb, cb, tsk);
2696 if (err) {
2697 prev_portid = tsk->portid;
2698 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2699 goto out;
2700 }
2701 prev_portid = 0;
2702 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2703 }
2704 }
2705out:
2706 rcu_read_unlock();
2707 cb->args[0] = tbl_id;
2708 cb->args[1] = prev_portid;
2709
2710 return skb->len;
2711}
2712
2713/* Caller should hold socket lock for the passed tipc socket. */
2714static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
2715 struct netlink_callback *cb,
2716 struct publication *publ)
2717{
2718 void *hdr;
2719 struct nlattr *attrs;
2720
2721 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2722 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
2723 if (!hdr)
2724 goto msg_cancel;
2725
2726 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
2727 if (!attrs)
2728 goto genlmsg_cancel;
2729
2730 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
2731 goto attr_msg_cancel;
2732 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
2733 goto attr_msg_cancel;
2734 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
2735 goto attr_msg_cancel;
2736 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
2737 goto attr_msg_cancel;
2738
2739 nla_nest_end(skb, attrs);
2740 genlmsg_end(skb, hdr);
2741
2742 return 0;
2743
2744attr_msg_cancel:
2745 nla_nest_cancel(skb, attrs);
2746genlmsg_cancel:
2747 genlmsg_cancel(skb, hdr);
2748msg_cancel:
2749 return -EMSGSIZE;
2750}
2751
2752/* Caller should hold socket lock for the passed tipc socket. */
2753static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
2754 struct netlink_callback *cb,
2755 struct tipc_sock *tsk, u32 *last_publ)
2756{
2757 int err;
2758 struct publication *p;
2759
2760 if (*last_publ) {
2761 list_for_each_entry(p, &tsk->publications, pport_list) {
2762 if (p->key == *last_publ)
2763 break;
2764 }
2765 if (p->key != *last_publ) {
2766 /* We never set seq or call nl_dump_check_consistent()
2767 * this means that setting prev_seq here will cause the
2768 * consistence check to fail in the netlink callback
2769 * handler. Resulting in the last NLMSG_DONE message
2770 * having the NLM_F_DUMP_INTR flag set.
2771 */
2772 cb->prev_seq = 1;
2773 *last_publ = 0;
2774 return -EPIPE;
2775 }
2776 } else {
2777 p = list_first_entry(&tsk->publications, struct publication,
2778 pport_list);
2779 }
2780
2781 list_for_each_entry_from(p, &tsk->publications, pport_list) {
2782 err = __tipc_nl_add_sk_publ(skb, cb, p);
2783 if (err) {
2784 *last_publ = p->key;
2785 return err;
2786 }
2787 }
2788 *last_publ = 0;
2789
2790 return 0;
2791}
2792
2793int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
2794{
2795 int err;
2796 u32 tsk_portid = cb->args[0];
2797 u32 last_publ = cb->args[1];
2798 u32 done = cb->args[2];
2799 struct net *net = sock_net(skb->sk);
2800 struct tipc_sock *tsk;
2801
2802 if (!tsk_portid) {
2803 struct nlattr **attrs;
2804 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
2805
2806 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2807 if (err)
2808 return err;
2809
2810 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
2811 attrs[TIPC_NLA_SOCK],
2812 tipc_nl_sock_policy);
2813 if (err)
2814 return err;
2815
2816 if (!sock[TIPC_NLA_SOCK_REF])
2817 return -EINVAL;
2818
2819 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
2820 }
2821
2822 if (done)
2823 return 0;
2824
2825 tsk = tipc_sk_lookup(net, tsk_portid);
2826 if (!tsk)
2827 return -EINVAL;
2828
2829 lock_sock(&tsk->sk);
2830 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
2831 if (!err)
2832 done = 1;
2833 release_sock(&tsk->sk);
2834 sock_put(&tsk->sk);
2835
2836 cb->args[0] = tsk_portid;
2837 cb->args[1] = last_publ;
2838 cb->args[2] = done;
2839
2840 return skb->len;
2841}
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}