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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, 2012-2017, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the names of the copyright holders nor the names of its
17 * contributors may be used to endorse or promote products derived from
18 * this software without specific prior written permission.
19 *
20 * Alternatively, this software may be distributed under the terms of the
21 * GNU General Public License ("GPL") version 2 as published by the Free
22 * Software Foundation.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
35 */
36
37#include <linux/rhashtable.h>
38#include <linux/sched/signal.h>
39
40#include "core.h"
41#include "name_table.h"
42#include "node.h"
43#include "link.h"
44#include "name_distr.h"
45#include "socket.h"
46#include "bcast.h"
47#include "netlink.h"
48#include "group.h"
49#include "trace.h"
50
51#define NAGLE_START_INIT 4
52#define NAGLE_START_MAX 1024
53#define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
54#define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
55#define TIPC_FWD_MSG 1
56#define TIPC_MAX_PORT 0xffffffff
57#define TIPC_MIN_PORT 1
58#define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
59
60enum {
61 TIPC_LISTEN = TCP_LISTEN,
62 TIPC_ESTABLISHED = TCP_ESTABLISHED,
63 TIPC_OPEN = TCP_CLOSE,
64 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
65 TIPC_CONNECTING = TCP_SYN_SENT,
66};
67
68struct sockaddr_pair {
69 struct sockaddr_tipc sock;
70 struct sockaddr_tipc member;
71};
72
73/**
74 * struct tipc_sock - TIPC socket structure
75 * @sk: socket - interacts with 'port' and with user via the socket API
76 * @conn_type: TIPC type used when connection was established
77 * @conn_instance: TIPC instance used when connection was established
78 * @published: non-zero if port has one or more associated names
79 * @max_pkt: maximum packet size "hint" used when building messages sent by port
80 * @maxnagle: maximum size of msg which can be subject to nagle
81 * @portid: unique port identity in TIPC socket hash table
82 * @phdr: preformatted message header used when sending messages
83 * #cong_links: list of congested links
84 * @publications: list of publications for port
85 * @blocking_link: address of the congested link we are currently sleeping on
86 * @pub_count: total # of publications port has made during its lifetime
87 * @conn_timeout: the time we can wait for an unresponded setup request
88 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
89 * @cong_link_cnt: number of congested links
90 * @snt_unacked: # messages sent by socket, and not yet acked by peer
91 * @rcv_unacked: # messages read by user, but not yet acked back to peer
92 * @peer: 'connected' peer for dgram/rdm
93 * @node: hash table node
94 * @mc_method: cookie for use between socket and broadcast layer
95 * @rcu: rcu struct for tipc_sock
96 */
97struct tipc_sock {
98 struct sock sk;
99 u32 conn_type;
100 u32 conn_instance;
101 int published;
102 u32 max_pkt;
103 u32 maxnagle;
104 u32 portid;
105 struct tipc_msg phdr;
106 struct list_head cong_links;
107 struct list_head publications;
108 u32 pub_count;
109 atomic_t dupl_rcvcnt;
110 u16 conn_timeout;
111 bool probe_unacked;
112 u16 cong_link_cnt;
113 u16 snt_unacked;
114 u16 snd_win;
115 u16 peer_caps;
116 u16 rcv_unacked;
117 u16 rcv_win;
118 struct sockaddr_tipc peer;
119 struct rhash_head node;
120 struct tipc_mc_method mc_method;
121 struct rcu_head rcu;
122 struct tipc_group *group;
123 u32 oneway;
124 u32 nagle_start;
125 u16 snd_backlog;
126 u16 msg_acc;
127 u16 pkt_cnt;
128 bool expect_ack;
129 bool nodelay;
130 bool group_is_open;
131};
132
133static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
134static void tipc_data_ready(struct sock *sk);
135static void tipc_write_space(struct sock *sk);
136static void tipc_sock_destruct(struct sock *sk);
137static int tipc_release(struct socket *sock);
138static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
139 bool kern);
140static void tipc_sk_timeout(struct timer_list *t);
141static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
142 struct tipc_name_seq const *seq);
143static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
144 struct tipc_name_seq const *seq);
145static int tipc_sk_leave(struct tipc_sock *tsk);
146static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
147static int tipc_sk_insert(struct tipc_sock *tsk);
148static void tipc_sk_remove(struct tipc_sock *tsk);
149static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
150static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
151static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
152
153static const struct proto_ops packet_ops;
154static const struct proto_ops stream_ops;
155static const struct proto_ops msg_ops;
156static struct proto tipc_proto;
157static const struct rhashtable_params tsk_rht_params;
158
159static u32 tsk_own_node(struct tipc_sock *tsk)
160{
161 return msg_prevnode(&tsk->phdr);
162}
163
164static u32 tsk_peer_node(struct tipc_sock *tsk)
165{
166 return msg_destnode(&tsk->phdr);
167}
168
169static u32 tsk_peer_port(struct tipc_sock *tsk)
170{
171 return msg_destport(&tsk->phdr);
172}
173
174static bool tsk_unreliable(struct tipc_sock *tsk)
175{
176 return msg_src_droppable(&tsk->phdr) != 0;
177}
178
179static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
180{
181 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
182}
183
184static bool tsk_unreturnable(struct tipc_sock *tsk)
185{
186 return msg_dest_droppable(&tsk->phdr) != 0;
187}
188
189static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
190{
191 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
192}
193
194static int tsk_importance(struct tipc_sock *tsk)
195{
196 return msg_importance(&tsk->phdr);
197}
198
199static struct tipc_sock *tipc_sk(const struct sock *sk)
200{
201 return container_of(sk, struct tipc_sock, sk);
202}
203
204int tsk_set_importance(struct sock *sk, int imp)
205{
206 if (imp > TIPC_CRITICAL_IMPORTANCE)
207 return -EINVAL;
208 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
209 return 0;
210}
211
212static bool tsk_conn_cong(struct tipc_sock *tsk)
213{
214 return tsk->snt_unacked > tsk->snd_win;
215}
216
217static u16 tsk_blocks(int len)
218{
219 return ((len / FLOWCTL_BLK_SZ) + 1);
220}
221
222/* tsk_blocks(): translate a buffer size in bytes to number of
223 * advertisable blocks, taking into account the ratio truesize(len)/len
224 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
225 */
226static u16 tsk_adv_blocks(int len)
227{
228 return len / FLOWCTL_BLK_SZ / 4;
229}
230
231/* tsk_inc(): increment counter for sent or received data
232 * - If block based flow control is not supported by peer we
233 * fall back to message based ditto, incrementing the counter
234 */
235static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
236{
237 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
238 return ((msglen / FLOWCTL_BLK_SZ) + 1);
239 return 1;
240}
241
242/* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
243 */
244static void tsk_set_nagle(struct tipc_sock *tsk)
245{
246 struct sock *sk = &tsk->sk;
247
248 tsk->maxnagle = 0;
249 if (sk->sk_type != SOCK_STREAM)
250 return;
251 if (tsk->nodelay)
252 return;
253 if (!(tsk->peer_caps & TIPC_NAGLE))
254 return;
255 /* Limit node local buffer size to avoid receive queue overflow */
256 if (tsk->max_pkt == MAX_MSG_SIZE)
257 tsk->maxnagle = 1500;
258 else
259 tsk->maxnagle = tsk->max_pkt;
260}
261
262/**
263 * tsk_advance_rx_queue - discard first buffer in socket receive queue
264 *
265 * Caller must hold socket lock
266 */
267static void tsk_advance_rx_queue(struct sock *sk)
268{
269 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
270 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
271}
272
273/* tipc_sk_respond() : send response message back to sender
274 */
275static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
276{
277 u32 selector;
278 u32 dnode;
279 u32 onode = tipc_own_addr(sock_net(sk));
280
281 if (!tipc_msg_reverse(onode, &skb, err))
282 return;
283
284 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
285 dnode = msg_destnode(buf_msg(skb));
286 selector = msg_origport(buf_msg(skb));
287 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
288}
289
290/**
291 * tsk_rej_rx_queue - reject all buffers in socket receive queue
292 *
293 * Caller must hold socket lock
294 */
295static void tsk_rej_rx_queue(struct sock *sk, int error)
296{
297 struct sk_buff *skb;
298
299 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
300 tipc_sk_respond(sk, skb, error);
301}
302
303static bool tipc_sk_connected(struct sock *sk)
304{
305 return sk->sk_state == TIPC_ESTABLISHED;
306}
307
308/* tipc_sk_type_connectionless - check if the socket is datagram socket
309 * @sk: socket
310 *
311 * Returns true if connection less, false otherwise
312 */
313static bool tipc_sk_type_connectionless(struct sock *sk)
314{
315 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
316}
317
318/* tsk_peer_msg - verify if message was sent by connected port's peer
319 *
320 * Handles cases where the node's network address has changed from
321 * the default of <0.0.0> to its configured setting.
322 */
323static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
324{
325 struct sock *sk = &tsk->sk;
326 u32 self = tipc_own_addr(sock_net(sk));
327 u32 peer_port = tsk_peer_port(tsk);
328 u32 orig_node, peer_node;
329
330 if (unlikely(!tipc_sk_connected(sk)))
331 return false;
332
333 if (unlikely(msg_origport(msg) != peer_port))
334 return false;
335
336 orig_node = msg_orignode(msg);
337 peer_node = tsk_peer_node(tsk);
338
339 if (likely(orig_node == peer_node))
340 return true;
341
342 if (!orig_node && peer_node == self)
343 return true;
344
345 if (!peer_node && orig_node == self)
346 return true;
347
348 return false;
349}
350
351/* tipc_set_sk_state - set the sk_state of the socket
352 * @sk: socket
353 *
354 * Caller must hold socket lock
355 *
356 * Returns 0 on success, errno otherwise
357 */
358static int tipc_set_sk_state(struct sock *sk, int state)
359{
360 int oldsk_state = sk->sk_state;
361 int res = -EINVAL;
362
363 switch (state) {
364 case TIPC_OPEN:
365 res = 0;
366 break;
367 case TIPC_LISTEN:
368 case TIPC_CONNECTING:
369 if (oldsk_state == TIPC_OPEN)
370 res = 0;
371 break;
372 case TIPC_ESTABLISHED:
373 if (oldsk_state == TIPC_CONNECTING ||
374 oldsk_state == TIPC_OPEN)
375 res = 0;
376 break;
377 case TIPC_DISCONNECTING:
378 if (oldsk_state == TIPC_CONNECTING ||
379 oldsk_state == TIPC_ESTABLISHED)
380 res = 0;
381 break;
382 }
383
384 if (!res)
385 sk->sk_state = state;
386
387 return res;
388}
389
390static int tipc_sk_sock_err(struct socket *sock, long *timeout)
391{
392 struct sock *sk = sock->sk;
393 int err = sock_error(sk);
394 int typ = sock->type;
395
396 if (err)
397 return err;
398 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
399 if (sk->sk_state == TIPC_DISCONNECTING)
400 return -EPIPE;
401 else if (!tipc_sk_connected(sk))
402 return -ENOTCONN;
403 }
404 if (!*timeout)
405 return -EAGAIN;
406 if (signal_pending(current))
407 return sock_intr_errno(*timeout);
408
409 return 0;
410}
411
412#define tipc_wait_for_cond(sock_, timeo_, condition_) \
413({ \
414 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
415 struct sock *sk_; \
416 int rc_; \
417 \
418 while ((rc_ = !(condition_))) { \
419 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
420 smp_rmb(); \
421 sk_ = (sock_)->sk; \
422 rc_ = tipc_sk_sock_err((sock_), timeo_); \
423 if (rc_) \
424 break; \
425 add_wait_queue(sk_sleep(sk_), &wait_); \
426 release_sock(sk_); \
427 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
428 sched_annotate_sleep(); \
429 lock_sock(sk_); \
430 remove_wait_queue(sk_sleep(sk_), &wait_); \
431 } \
432 rc_; \
433})
434
435/**
436 * tipc_sk_create - create a TIPC socket
437 * @net: network namespace (must be default network)
438 * @sock: pre-allocated socket structure
439 * @protocol: protocol indicator (must be 0)
440 * @kern: caused by kernel or by userspace?
441 *
442 * This routine creates additional data structures used by the TIPC socket,
443 * initializes them, and links them together.
444 *
445 * Returns 0 on success, errno otherwise
446 */
447static int tipc_sk_create(struct net *net, struct socket *sock,
448 int protocol, int kern)
449{
450 const struct proto_ops *ops;
451 struct sock *sk;
452 struct tipc_sock *tsk;
453 struct tipc_msg *msg;
454
455 /* Validate arguments */
456 if (unlikely(protocol != 0))
457 return -EPROTONOSUPPORT;
458
459 switch (sock->type) {
460 case SOCK_STREAM:
461 ops = &stream_ops;
462 break;
463 case SOCK_SEQPACKET:
464 ops = &packet_ops;
465 break;
466 case SOCK_DGRAM:
467 case SOCK_RDM:
468 ops = &msg_ops;
469 break;
470 default:
471 return -EPROTOTYPE;
472 }
473
474 /* Allocate socket's protocol area */
475 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
476 if (sk == NULL)
477 return -ENOMEM;
478
479 tsk = tipc_sk(sk);
480 tsk->max_pkt = MAX_PKT_DEFAULT;
481 tsk->maxnagle = 0;
482 tsk->nagle_start = NAGLE_START_INIT;
483 INIT_LIST_HEAD(&tsk->publications);
484 INIT_LIST_HEAD(&tsk->cong_links);
485 msg = &tsk->phdr;
486
487 /* Finish initializing socket data structures */
488 sock->ops = ops;
489 sock_init_data(sock, sk);
490 tipc_set_sk_state(sk, TIPC_OPEN);
491 if (tipc_sk_insert(tsk)) {
492 pr_warn("Socket create failed; port number exhausted\n");
493 return -EINVAL;
494 }
495
496 /* Ensure tsk is visible before we read own_addr. */
497 smp_mb();
498
499 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
500 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
501
502 msg_set_origport(msg, tsk->portid);
503 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
504 sk->sk_shutdown = 0;
505 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
506 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
507 sk->sk_data_ready = tipc_data_ready;
508 sk->sk_write_space = tipc_write_space;
509 sk->sk_destruct = tipc_sock_destruct;
510 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
511 tsk->group_is_open = true;
512 atomic_set(&tsk->dupl_rcvcnt, 0);
513
514 /* Start out with safe limits until we receive an advertised window */
515 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
516 tsk->rcv_win = tsk->snd_win;
517
518 if (tipc_sk_type_connectionless(sk)) {
519 tsk_set_unreturnable(tsk, true);
520 if (sock->type == SOCK_DGRAM)
521 tsk_set_unreliable(tsk, true);
522 }
523 __skb_queue_head_init(&tsk->mc_method.deferredq);
524 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
525 return 0;
526}
527
528static void tipc_sk_callback(struct rcu_head *head)
529{
530 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
531
532 sock_put(&tsk->sk);
533}
534
535/* Caller should hold socket lock for the socket. */
536static void __tipc_shutdown(struct socket *sock, int error)
537{
538 struct sock *sk = sock->sk;
539 struct tipc_sock *tsk = tipc_sk(sk);
540 struct net *net = sock_net(sk);
541 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
542 u32 dnode = tsk_peer_node(tsk);
543 struct sk_buff *skb;
544
545 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
546 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
547 !tsk_conn_cong(tsk)));
548
549 /* Push out delayed messages if in Nagle mode */
550 tipc_sk_push_backlog(tsk, false);
551 /* Remove pending SYN */
552 __skb_queue_purge(&sk->sk_write_queue);
553
554 /* Remove partially received buffer if any */
555 skb = skb_peek(&sk->sk_receive_queue);
556 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
557 __skb_unlink(skb, &sk->sk_receive_queue);
558 kfree_skb(skb);
559 }
560
561 /* Reject all unreceived messages if connectionless */
562 if (tipc_sk_type_connectionless(sk)) {
563 tsk_rej_rx_queue(sk, error);
564 return;
565 }
566
567 switch (sk->sk_state) {
568 case TIPC_CONNECTING:
569 case TIPC_ESTABLISHED:
570 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
571 tipc_node_remove_conn(net, dnode, tsk->portid);
572 /* Send a FIN+/- to its peer */
573 skb = __skb_dequeue(&sk->sk_receive_queue);
574 if (skb) {
575 __skb_queue_purge(&sk->sk_receive_queue);
576 tipc_sk_respond(sk, skb, error);
577 break;
578 }
579 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
580 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
581 tsk_own_node(tsk), tsk_peer_port(tsk),
582 tsk->portid, error);
583 if (skb)
584 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
585 break;
586 case TIPC_LISTEN:
587 /* Reject all SYN messages */
588 tsk_rej_rx_queue(sk, error);
589 break;
590 default:
591 __skb_queue_purge(&sk->sk_receive_queue);
592 break;
593 }
594}
595
596/**
597 * tipc_release - destroy a TIPC socket
598 * @sock: socket to destroy
599 *
600 * This routine cleans up any messages that are still queued on the socket.
601 * For DGRAM and RDM socket types, all queued messages are rejected.
602 * For SEQPACKET and STREAM socket types, the first message is rejected
603 * and any others are discarded. (If the first message on a STREAM socket
604 * is partially-read, it is discarded and the next one is rejected instead.)
605 *
606 * NOTE: Rejected messages are not necessarily returned to the sender! They
607 * are returned or discarded according to the "destination droppable" setting
608 * specified for the message by the sender.
609 *
610 * Returns 0 on success, errno otherwise
611 */
612static int tipc_release(struct socket *sock)
613{
614 struct sock *sk = sock->sk;
615 struct tipc_sock *tsk;
616
617 /*
618 * Exit if socket isn't fully initialized (occurs when a failed accept()
619 * releases a pre-allocated child socket that was never used)
620 */
621 if (sk == NULL)
622 return 0;
623
624 tsk = tipc_sk(sk);
625 lock_sock(sk);
626
627 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
628 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
629 sk->sk_shutdown = SHUTDOWN_MASK;
630 tipc_sk_leave(tsk);
631 tipc_sk_withdraw(tsk, 0, NULL);
632 __skb_queue_purge(&tsk->mc_method.deferredq);
633 sk_stop_timer(sk, &sk->sk_timer);
634 tipc_sk_remove(tsk);
635
636 sock_orphan(sk);
637 /* Reject any messages that accumulated in backlog queue */
638 release_sock(sk);
639 tipc_dest_list_purge(&tsk->cong_links);
640 tsk->cong_link_cnt = 0;
641 call_rcu(&tsk->rcu, tipc_sk_callback);
642 sock->sk = NULL;
643
644 return 0;
645}
646
647/**
648 * tipc_bind - associate or disassocate TIPC name(s) with a socket
649 * @sock: socket structure
650 * @uaddr: socket address describing name(s) and desired operation
651 * @uaddr_len: size of socket address data structure
652 *
653 * Name and name sequence binding is indicated using a positive scope value;
654 * a negative scope value unbinds the specified name. Specifying no name
655 * (i.e. a socket address length of 0) unbinds all names from the socket.
656 *
657 * Returns 0 on success, errno otherwise
658 *
659 * NOTE: This routine doesn't need to take the socket lock since it doesn't
660 * access any non-constant socket information.
661 */
662static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
663 int uaddr_len)
664{
665 struct sock *sk = sock->sk;
666 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
667 struct tipc_sock *tsk = tipc_sk(sk);
668 int res = -EINVAL;
669
670 lock_sock(sk);
671 if (unlikely(!uaddr_len)) {
672 res = tipc_sk_withdraw(tsk, 0, NULL);
673 goto exit;
674 }
675 if (tsk->group) {
676 res = -EACCES;
677 goto exit;
678 }
679 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
680 res = -EINVAL;
681 goto exit;
682 }
683 if (addr->family != AF_TIPC) {
684 res = -EAFNOSUPPORT;
685 goto exit;
686 }
687
688 if (addr->addrtype == TIPC_ADDR_NAME)
689 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
690 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
691 res = -EAFNOSUPPORT;
692 goto exit;
693 }
694
695 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
696 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
697 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
698 res = -EACCES;
699 goto exit;
700 }
701
702 res = (addr->scope >= 0) ?
703 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
704 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
705exit:
706 release_sock(sk);
707 return res;
708}
709
710/**
711 * tipc_getname - get port ID of socket or peer socket
712 * @sock: socket structure
713 * @uaddr: area for returned socket address
714 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
715 *
716 * Returns 0 on success, errno otherwise
717 *
718 * NOTE: This routine doesn't need to take the socket lock since it only
719 * accesses socket information that is unchanging (or which changes in
720 * a completely predictable manner).
721 */
722static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
723 int peer)
724{
725 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
726 struct sock *sk = sock->sk;
727 struct tipc_sock *tsk = tipc_sk(sk);
728
729 memset(addr, 0, sizeof(*addr));
730 if (peer) {
731 if ((!tipc_sk_connected(sk)) &&
732 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
733 return -ENOTCONN;
734 addr->addr.id.ref = tsk_peer_port(tsk);
735 addr->addr.id.node = tsk_peer_node(tsk);
736 } else {
737 addr->addr.id.ref = tsk->portid;
738 addr->addr.id.node = tipc_own_addr(sock_net(sk));
739 }
740
741 addr->addrtype = TIPC_ADDR_ID;
742 addr->family = AF_TIPC;
743 addr->scope = 0;
744 addr->addr.name.domain = 0;
745
746 return sizeof(*addr);
747}
748
749/**
750 * tipc_poll - read and possibly block on pollmask
751 * @file: file structure associated with the socket
752 * @sock: socket for which to calculate the poll bits
753 * @wait: ???
754 *
755 * Returns pollmask value
756 *
757 * COMMENTARY:
758 * It appears that the usual socket locking mechanisms are not useful here
759 * since the pollmask info is potentially out-of-date the moment this routine
760 * exits. TCP and other protocols seem to rely on higher level poll routines
761 * to handle any preventable race conditions, so TIPC will do the same ...
762 *
763 * IMPORTANT: The fact that a read or write operation is indicated does NOT
764 * imply that the operation will succeed, merely that it should be performed
765 * and will not block.
766 */
767static __poll_t tipc_poll(struct file *file, struct socket *sock,
768 poll_table *wait)
769{
770 struct sock *sk = sock->sk;
771 struct tipc_sock *tsk = tipc_sk(sk);
772 __poll_t revents = 0;
773
774 sock_poll_wait(file, sock, wait);
775 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
776
777 if (sk->sk_shutdown & RCV_SHUTDOWN)
778 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
779 if (sk->sk_shutdown == SHUTDOWN_MASK)
780 revents |= EPOLLHUP;
781
782 switch (sk->sk_state) {
783 case TIPC_ESTABLISHED:
784 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
785 revents |= EPOLLOUT;
786 fallthrough;
787 case TIPC_LISTEN:
788 case TIPC_CONNECTING:
789 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
790 revents |= EPOLLIN | EPOLLRDNORM;
791 break;
792 case TIPC_OPEN:
793 if (tsk->group_is_open && !tsk->cong_link_cnt)
794 revents |= EPOLLOUT;
795 if (!tipc_sk_type_connectionless(sk))
796 break;
797 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
798 break;
799 revents |= EPOLLIN | EPOLLRDNORM;
800 break;
801 case TIPC_DISCONNECTING:
802 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
803 break;
804 }
805 return revents;
806}
807
808/**
809 * tipc_sendmcast - send multicast message
810 * @sock: socket structure
811 * @seq: destination address
812 * @msg: message to send
813 * @dlen: length of data to send
814 * @timeout: timeout to wait for wakeup
815 *
816 * Called from function tipc_sendmsg(), which has done all sanity checks
817 * Returns the number of bytes sent on success, or errno
818 */
819static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
820 struct msghdr *msg, size_t dlen, long timeout)
821{
822 struct sock *sk = sock->sk;
823 struct tipc_sock *tsk = tipc_sk(sk);
824 struct tipc_msg *hdr = &tsk->phdr;
825 struct net *net = sock_net(sk);
826 int mtu = tipc_bcast_get_mtu(net);
827 struct tipc_mc_method *method = &tsk->mc_method;
828 struct sk_buff_head pkts;
829 struct tipc_nlist dsts;
830 int rc;
831
832 if (tsk->group)
833 return -EACCES;
834
835 /* Block or return if any destination link is congested */
836 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
837 if (unlikely(rc))
838 return rc;
839
840 /* Lookup destination nodes */
841 tipc_nlist_init(&dsts, tipc_own_addr(net));
842 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
843 seq->upper, &dsts);
844 if (!dsts.local && !dsts.remote)
845 return -EHOSTUNREACH;
846
847 /* Build message header */
848 msg_set_type(hdr, TIPC_MCAST_MSG);
849 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
850 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
851 msg_set_destport(hdr, 0);
852 msg_set_destnode(hdr, 0);
853 msg_set_nametype(hdr, seq->type);
854 msg_set_namelower(hdr, seq->lower);
855 msg_set_nameupper(hdr, seq->upper);
856
857 /* Build message as chain of buffers */
858 __skb_queue_head_init(&pkts);
859 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
860
861 /* Send message if build was successful */
862 if (unlikely(rc == dlen)) {
863 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
864 TIPC_DUMP_SK_SNDQ, " ");
865 rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
866 &tsk->cong_link_cnt);
867 }
868
869 tipc_nlist_purge(&dsts);
870
871 return rc ? rc : dlen;
872}
873
874/**
875 * tipc_send_group_msg - send a message to a member in the group
876 * @net: network namespace
877 * @m: message to send
878 * @mb: group member
879 * @dnode: destination node
880 * @dport: destination port
881 * @dlen: total length of message data
882 */
883static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
884 struct msghdr *m, struct tipc_member *mb,
885 u32 dnode, u32 dport, int dlen)
886{
887 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
888 struct tipc_mc_method *method = &tsk->mc_method;
889 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
890 struct tipc_msg *hdr = &tsk->phdr;
891 struct sk_buff_head pkts;
892 int mtu, rc;
893
894 /* Complete message header */
895 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
896 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
897 msg_set_destport(hdr, dport);
898 msg_set_destnode(hdr, dnode);
899 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
900
901 /* Build message as chain of buffers */
902 __skb_queue_head_init(&pkts);
903 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
904 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
905 if (unlikely(rc != dlen))
906 return rc;
907
908 /* Send message */
909 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
910 if (unlikely(rc == -ELINKCONG)) {
911 tipc_dest_push(&tsk->cong_links, dnode, 0);
912 tsk->cong_link_cnt++;
913 }
914
915 /* Update send window */
916 tipc_group_update_member(mb, blks);
917
918 /* A broadcast sent within next EXPIRE period must follow same path */
919 method->rcast = true;
920 method->mandatory = true;
921 return dlen;
922}
923
924/**
925 * tipc_send_group_unicast - send message to a member in the group
926 * @sock: socket structure
927 * @m: message to send
928 * @dlen: total length of message data
929 * @timeout: timeout to wait for wakeup
930 *
931 * Called from function tipc_sendmsg(), which has done all sanity checks
932 * Returns the number of bytes sent on success, or errno
933 */
934static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
935 int dlen, long timeout)
936{
937 struct sock *sk = sock->sk;
938 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
939 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
940 struct tipc_sock *tsk = tipc_sk(sk);
941 struct net *net = sock_net(sk);
942 struct tipc_member *mb = NULL;
943 u32 node, port;
944 int rc;
945
946 node = dest->addr.id.node;
947 port = dest->addr.id.ref;
948 if (!port && !node)
949 return -EHOSTUNREACH;
950
951 /* Block or return if destination link or member is congested */
952 rc = tipc_wait_for_cond(sock, &timeout,
953 !tipc_dest_find(&tsk->cong_links, node, 0) &&
954 tsk->group &&
955 !tipc_group_cong(tsk->group, node, port, blks,
956 &mb));
957 if (unlikely(rc))
958 return rc;
959
960 if (unlikely(!mb))
961 return -EHOSTUNREACH;
962
963 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
964
965 return rc ? rc : dlen;
966}
967
968/**
969 * tipc_send_group_anycast - send message to any member with given identity
970 * @sock: socket structure
971 * @m: message to send
972 * @dlen: total length of message data
973 * @timeout: timeout to wait for wakeup
974 *
975 * Called from function tipc_sendmsg(), which has done all sanity checks
976 * Returns the number of bytes sent on success, or errno
977 */
978static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
979 int dlen, long timeout)
980{
981 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
982 struct sock *sk = sock->sk;
983 struct tipc_sock *tsk = tipc_sk(sk);
984 struct list_head *cong_links = &tsk->cong_links;
985 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
986 struct tipc_msg *hdr = &tsk->phdr;
987 struct tipc_member *first = NULL;
988 struct tipc_member *mbr = NULL;
989 struct net *net = sock_net(sk);
990 u32 node, port, exclude;
991 struct list_head dsts;
992 u32 type, inst, scope;
993 int lookups = 0;
994 int dstcnt, rc;
995 bool cong;
996
997 INIT_LIST_HEAD(&dsts);
998
999 type = msg_nametype(hdr);
1000 inst = dest->addr.name.name.instance;
1001 scope = msg_lookup_scope(hdr);
1002
1003 while (++lookups < 4) {
1004 exclude = tipc_group_exclude(tsk->group);
1005
1006 first = NULL;
1007
1008 /* Look for a non-congested destination member, if any */
1009 while (1) {
1010 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
1011 &dstcnt, exclude, false))
1012 return -EHOSTUNREACH;
1013 tipc_dest_pop(&dsts, &node, &port);
1014 cong = tipc_group_cong(tsk->group, node, port, blks,
1015 &mbr);
1016 if (!cong)
1017 break;
1018 if (mbr == first)
1019 break;
1020 if (!first)
1021 first = mbr;
1022 }
1023
1024 /* Start over if destination was not in member list */
1025 if (unlikely(!mbr))
1026 continue;
1027
1028 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1029 break;
1030
1031 /* Block or return if destination link or member is congested */
1032 rc = tipc_wait_for_cond(sock, &timeout,
1033 !tipc_dest_find(cong_links, node, 0) &&
1034 tsk->group &&
1035 !tipc_group_cong(tsk->group, node, port,
1036 blks, &mbr));
1037 if (unlikely(rc))
1038 return rc;
1039
1040 /* Send, unless destination disappeared while waiting */
1041 if (likely(mbr))
1042 break;
1043 }
1044
1045 if (unlikely(lookups >= 4))
1046 return -EHOSTUNREACH;
1047
1048 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1049
1050 return rc ? rc : dlen;
1051}
1052
1053/**
1054 * tipc_send_group_bcast - send message to all members in communication group
1055 * @sock: socket structure
1056 * @m: message to send
1057 * @dlen: total length of message data
1058 * @timeout: timeout to wait for wakeup
1059 *
1060 * Called from function tipc_sendmsg(), which has done all sanity checks
1061 * Returns the number of bytes sent on success, or errno
1062 */
1063static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1064 int dlen, long timeout)
1065{
1066 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1067 struct sock *sk = sock->sk;
1068 struct net *net = sock_net(sk);
1069 struct tipc_sock *tsk = tipc_sk(sk);
1070 struct tipc_nlist *dsts;
1071 struct tipc_mc_method *method = &tsk->mc_method;
1072 bool ack = method->mandatory && method->rcast;
1073 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1074 struct tipc_msg *hdr = &tsk->phdr;
1075 int mtu = tipc_bcast_get_mtu(net);
1076 struct sk_buff_head pkts;
1077 int rc = -EHOSTUNREACH;
1078
1079 /* Block or return if any destination link or member is congested */
1080 rc = tipc_wait_for_cond(sock, &timeout,
1081 !tsk->cong_link_cnt && tsk->group &&
1082 !tipc_group_bc_cong(tsk->group, blks));
1083 if (unlikely(rc))
1084 return rc;
1085
1086 dsts = tipc_group_dests(tsk->group);
1087 if (!dsts->local && !dsts->remote)
1088 return -EHOSTUNREACH;
1089
1090 /* Complete message header */
1091 if (dest) {
1092 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1093 msg_set_nameinst(hdr, dest->addr.name.name.instance);
1094 } else {
1095 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1096 msg_set_nameinst(hdr, 0);
1097 }
1098 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1099 msg_set_destport(hdr, 0);
1100 msg_set_destnode(hdr, 0);
1101 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1102
1103 /* Avoid getting stuck with repeated forced replicasts */
1104 msg_set_grp_bc_ack_req(hdr, ack);
1105
1106 /* Build message as chain of buffers */
1107 __skb_queue_head_init(&pkts);
1108 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1109 if (unlikely(rc != dlen))
1110 return rc;
1111
1112 /* Send message */
1113 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1114 if (unlikely(rc))
1115 return rc;
1116
1117 /* Update broadcast sequence number and send windows */
1118 tipc_group_update_bc_members(tsk->group, blks, ack);
1119
1120 /* Broadcast link is now free to choose method for next broadcast */
1121 method->mandatory = false;
1122 method->expires = jiffies;
1123
1124 return dlen;
1125}
1126
1127/**
1128 * tipc_send_group_mcast - send message to all members with given identity
1129 * @sock: socket structure
1130 * @m: message to send
1131 * @dlen: total length of message data
1132 * @timeout: timeout to wait for wakeup
1133 *
1134 * Called from function tipc_sendmsg(), which has done all sanity checks
1135 * Returns the number of bytes sent on success, or errno
1136 */
1137static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1138 int dlen, long timeout)
1139{
1140 struct sock *sk = sock->sk;
1141 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1142 struct tipc_sock *tsk = tipc_sk(sk);
1143 struct tipc_group *grp = tsk->group;
1144 struct tipc_msg *hdr = &tsk->phdr;
1145 struct net *net = sock_net(sk);
1146 u32 type, inst, scope, exclude;
1147 struct list_head dsts;
1148 u32 dstcnt;
1149
1150 INIT_LIST_HEAD(&dsts);
1151
1152 type = msg_nametype(hdr);
1153 inst = dest->addr.name.name.instance;
1154 scope = msg_lookup_scope(hdr);
1155 exclude = tipc_group_exclude(grp);
1156
1157 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
1158 &dstcnt, exclude, true))
1159 return -EHOSTUNREACH;
1160
1161 if (dstcnt == 1) {
1162 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
1163 return tipc_send_group_unicast(sock, m, dlen, timeout);
1164 }
1165
1166 tipc_dest_list_purge(&dsts);
1167 return tipc_send_group_bcast(sock, m, dlen, timeout);
1168}
1169
1170/**
1171 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1172 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1173 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1174 *
1175 * Multi-threaded: parallel calls with reference to same queues may occur
1176 */
1177void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1178 struct sk_buff_head *inputq)
1179{
1180 u32 self = tipc_own_addr(net);
1181 u32 type, lower, upper, scope;
1182 struct sk_buff *skb, *_skb;
1183 u32 portid, onode;
1184 struct sk_buff_head tmpq;
1185 struct list_head dports;
1186 struct tipc_msg *hdr;
1187 int user, mtyp, hlen;
1188 bool exact;
1189
1190 __skb_queue_head_init(&tmpq);
1191 INIT_LIST_HEAD(&dports);
1192
1193 skb = tipc_skb_peek(arrvq, &inputq->lock);
1194 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1195 hdr = buf_msg(skb);
1196 user = msg_user(hdr);
1197 mtyp = msg_type(hdr);
1198 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1199 onode = msg_orignode(hdr);
1200 type = msg_nametype(hdr);
1201
1202 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1203 spin_lock_bh(&inputq->lock);
1204 if (skb_peek(arrvq) == skb) {
1205 __skb_dequeue(arrvq);
1206 __skb_queue_tail(inputq, skb);
1207 }
1208 kfree_skb(skb);
1209 spin_unlock_bh(&inputq->lock);
1210 continue;
1211 }
1212
1213 /* Group messages require exact scope match */
1214 if (msg_in_group(hdr)) {
1215 lower = 0;
1216 upper = ~0;
1217 scope = msg_lookup_scope(hdr);
1218 exact = true;
1219 } else {
1220 /* TIPC_NODE_SCOPE means "any scope" in this context */
1221 if (onode == self)
1222 scope = TIPC_NODE_SCOPE;
1223 else
1224 scope = TIPC_CLUSTER_SCOPE;
1225 exact = false;
1226 lower = msg_namelower(hdr);
1227 upper = msg_nameupper(hdr);
1228 }
1229
1230 /* Create destination port list: */
1231 tipc_nametbl_mc_lookup(net, type, lower, upper,
1232 scope, exact, &dports);
1233
1234 /* Clone message per destination */
1235 while (tipc_dest_pop(&dports, NULL, &portid)) {
1236 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1237 if (_skb) {
1238 msg_set_destport(buf_msg(_skb), portid);
1239 __skb_queue_tail(&tmpq, _skb);
1240 continue;
1241 }
1242 pr_warn("Failed to clone mcast rcv buffer\n");
1243 }
1244 /* Append to inputq if not already done by other thread */
1245 spin_lock_bh(&inputq->lock);
1246 if (skb_peek(arrvq) == skb) {
1247 skb_queue_splice_tail_init(&tmpq, inputq);
1248 kfree_skb(__skb_dequeue(arrvq));
1249 }
1250 spin_unlock_bh(&inputq->lock);
1251 __skb_queue_purge(&tmpq);
1252 kfree_skb(skb);
1253 }
1254 tipc_sk_rcv(net, inputq);
1255}
1256
1257/* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1258 * when socket is in Nagle mode
1259 */
1260static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1261{
1262 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1263 struct sk_buff *skb = skb_peek_tail(txq);
1264 struct net *net = sock_net(&tsk->sk);
1265 u32 dnode = tsk_peer_node(tsk);
1266 int rc;
1267
1268 if (nagle_ack) {
1269 tsk->pkt_cnt += skb_queue_len(txq);
1270 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1271 tsk->oneway = 0;
1272 if (tsk->nagle_start < NAGLE_START_MAX)
1273 tsk->nagle_start *= 2;
1274 tsk->expect_ack = false;
1275 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1276 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1277 tsk->nagle_start);
1278 } else {
1279 tsk->nagle_start = NAGLE_START_INIT;
1280 if (skb) {
1281 msg_set_ack_required(buf_msg(skb));
1282 tsk->expect_ack = true;
1283 } else {
1284 tsk->expect_ack = false;
1285 }
1286 }
1287 tsk->msg_acc = 0;
1288 tsk->pkt_cnt = 0;
1289 }
1290
1291 if (!skb || tsk->cong_link_cnt)
1292 return;
1293
1294 /* Do not send SYN again after congestion */
1295 if (msg_is_syn(buf_msg(skb)))
1296 return;
1297
1298 if (tsk->msg_acc)
1299 tsk->pkt_cnt += skb_queue_len(txq);
1300 tsk->snt_unacked += tsk->snd_backlog;
1301 tsk->snd_backlog = 0;
1302 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1303 if (rc == -ELINKCONG)
1304 tsk->cong_link_cnt = 1;
1305}
1306
1307/**
1308 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1309 * @tsk: receiving socket
1310 * @skb: pointer to message buffer.
1311 */
1312static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1313 struct sk_buff_head *inputq,
1314 struct sk_buff_head *xmitq)
1315{
1316 struct tipc_msg *hdr = buf_msg(skb);
1317 u32 onode = tsk_own_node(tsk);
1318 struct sock *sk = &tsk->sk;
1319 int mtyp = msg_type(hdr);
1320 bool was_cong;
1321
1322 /* Ignore if connection cannot be validated: */
1323 if (!tsk_peer_msg(tsk, hdr)) {
1324 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1325 goto exit;
1326 }
1327
1328 if (unlikely(msg_errcode(hdr))) {
1329 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1330 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1331 tsk_peer_port(tsk));
1332 sk->sk_state_change(sk);
1333
1334 /* State change is ignored if socket already awake,
1335 * - convert msg to abort msg and add to inqueue
1336 */
1337 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1338 msg_set_type(hdr, TIPC_CONN_MSG);
1339 msg_set_size(hdr, BASIC_H_SIZE);
1340 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1341 __skb_queue_tail(inputq, skb);
1342 return;
1343 }
1344
1345 tsk->probe_unacked = false;
1346
1347 if (mtyp == CONN_PROBE) {
1348 msg_set_type(hdr, CONN_PROBE_REPLY);
1349 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1350 __skb_queue_tail(xmitq, skb);
1351 return;
1352 } else if (mtyp == CONN_ACK) {
1353 was_cong = tsk_conn_cong(tsk);
1354 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1355 tsk->snt_unacked -= msg_conn_ack(hdr);
1356 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1357 tsk->snd_win = msg_adv_win(hdr);
1358 if (was_cong && !tsk_conn_cong(tsk))
1359 sk->sk_write_space(sk);
1360 } else if (mtyp != CONN_PROBE_REPLY) {
1361 pr_warn("Received unknown CONN_PROTO msg\n");
1362 }
1363exit:
1364 kfree_skb(skb);
1365}
1366
1367/**
1368 * tipc_sendmsg - send message in connectionless manner
1369 * @sock: socket structure
1370 * @m: message to send
1371 * @dsz: amount of user data to be sent
1372 *
1373 * Message must have an destination specified explicitly.
1374 * Used for SOCK_RDM and SOCK_DGRAM messages,
1375 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1376 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1377 *
1378 * Returns the number of bytes sent on success, or errno otherwise
1379 */
1380static int tipc_sendmsg(struct socket *sock,
1381 struct msghdr *m, size_t dsz)
1382{
1383 struct sock *sk = sock->sk;
1384 int ret;
1385
1386 lock_sock(sk);
1387 ret = __tipc_sendmsg(sock, m, dsz);
1388 release_sock(sk);
1389
1390 return ret;
1391}
1392
1393static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1394{
1395 struct sock *sk = sock->sk;
1396 struct net *net = sock_net(sk);
1397 struct tipc_sock *tsk = tipc_sk(sk);
1398 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1399 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1400 struct list_head *clinks = &tsk->cong_links;
1401 bool syn = !tipc_sk_type_connectionless(sk);
1402 struct tipc_group *grp = tsk->group;
1403 struct tipc_msg *hdr = &tsk->phdr;
1404 struct tipc_name_seq *seq;
1405 struct sk_buff_head pkts;
1406 u32 dport = 0, dnode = 0;
1407 u32 type = 0, inst = 0;
1408 int mtu, rc;
1409
1410 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1411 return -EMSGSIZE;
1412
1413 if (likely(dest)) {
1414 if (unlikely(m->msg_namelen < sizeof(*dest)))
1415 return -EINVAL;
1416 if (unlikely(dest->family != AF_TIPC))
1417 return -EINVAL;
1418 }
1419
1420 if (grp) {
1421 if (!dest)
1422 return tipc_send_group_bcast(sock, m, dlen, timeout);
1423 if (dest->addrtype == TIPC_ADDR_NAME)
1424 return tipc_send_group_anycast(sock, m, dlen, timeout);
1425 if (dest->addrtype == TIPC_ADDR_ID)
1426 return tipc_send_group_unicast(sock, m, dlen, timeout);
1427 if (dest->addrtype == TIPC_ADDR_MCAST)
1428 return tipc_send_group_mcast(sock, m, dlen, timeout);
1429 return -EINVAL;
1430 }
1431
1432 if (unlikely(!dest)) {
1433 dest = &tsk->peer;
1434 if (!syn && dest->family != AF_TIPC)
1435 return -EDESTADDRREQ;
1436 }
1437
1438 if (unlikely(syn)) {
1439 if (sk->sk_state == TIPC_LISTEN)
1440 return -EPIPE;
1441 if (sk->sk_state != TIPC_OPEN)
1442 return -EISCONN;
1443 if (tsk->published)
1444 return -EOPNOTSUPP;
1445 if (dest->addrtype == TIPC_ADDR_NAME) {
1446 tsk->conn_type = dest->addr.name.name.type;
1447 tsk->conn_instance = dest->addr.name.name.instance;
1448 }
1449 msg_set_syn(hdr, 1);
1450 }
1451
1452 seq = &dest->addr.nameseq;
1453 if (dest->addrtype == TIPC_ADDR_MCAST)
1454 return tipc_sendmcast(sock, seq, m, dlen, timeout);
1455
1456 if (dest->addrtype == TIPC_ADDR_NAME) {
1457 type = dest->addr.name.name.type;
1458 inst = dest->addr.name.name.instance;
1459 dnode = dest->addr.name.domain;
1460 dport = tipc_nametbl_translate(net, type, inst, &dnode);
1461 if (unlikely(!dport && !dnode))
1462 return -EHOSTUNREACH;
1463 } else if (dest->addrtype == TIPC_ADDR_ID) {
1464 dnode = dest->addr.id.node;
1465 } else {
1466 return -EINVAL;
1467 }
1468
1469 /* Block or return if destination link is congested */
1470 rc = tipc_wait_for_cond(sock, &timeout,
1471 !tipc_dest_find(clinks, dnode, 0));
1472 if (unlikely(rc))
1473 return rc;
1474
1475 if (dest->addrtype == TIPC_ADDR_NAME) {
1476 msg_set_type(hdr, TIPC_NAMED_MSG);
1477 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1478 msg_set_nametype(hdr, type);
1479 msg_set_nameinst(hdr, inst);
1480 msg_set_lookup_scope(hdr, tipc_node2scope(dnode));
1481 msg_set_destnode(hdr, dnode);
1482 msg_set_destport(hdr, dport);
1483 } else { /* TIPC_ADDR_ID */
1484 msg_set_type(hdr, TIPC_DIRECT_MSG);
1485 msg_set_lookup_scope(hdr, 0);
1486 msg_set_destnode(hdr, dnode);
1487 msg_set_destport(hdr, dest->addr.id.ref);
1488 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1489 }
1490
1491 __skb_queue_head_init(&pkts);
1492 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, true);
1493 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1494 if (unlikely(rc != dlen))
1495 return rc;
1496 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1497 __skb_queue_purge(&pkts);
1498 return -ENOMEM;
1499 }
1500
1501 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1502 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1503 if (unlikely(rc == -ELINKCONG)) {
1504 tipc_dest_push(clinks, dnode, 0);
1505 tsk->cong_link_cnt++;
1506 rc = 0;
1507 }
1508
1509 if (unlikely(syn && !rc))
1510 tipc_set_sk_state(sk, TIPC_CONNECTING);
1511
1512 return rc ? rc : dlen;
1513}
1514
1515/**
1516 * tipc_sendstream - send stream-oriented data
1517 * @sock: socket structure
1518 * @m: data to send
1519 * @dsz: total length of data to be transmitted
1520 *
1521 * Used for SOCK_STREAM data.
1522 *
1523 * Returns the number of bytes sent on success (or partial success),
1524 * or errno if no data sent
1525 */
1526static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1527{
1528 struct sock *sk = sock->sk;
1529 int ret;
1530
1531 lock_sock(sk);
1532 ret = __tipc_sendstream(sock, m, dsz);
1533 release_sock(sk);
1534
1535 return ret;
1536}
1537
1538static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1539{
1540 struct sock *sk = sock->sk;
1541 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1542 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1543 struct sk_buff_head *txq = &sk->sk_write_queue;
1544 struct tipc_sock *tsk = tipc_sk(sk);
1545 struct tipc_msg *hdr = &tsk->phdr;
1546 struct net *net = sock_net(sk);
1547 struct sk_buff *skb;
1548 u32 dnode = tsk_peer_node(tsk);
1549 int maxnagle = tsk->maxnagle;
1550 int maxpkt = tsk->max_pkt;
1551 int send, sent = 0;
1552 int blocks, rc = 0;
1553
1554 if (unlikely(dlen > INT_MAX))
1555 return -EMSGSIZE;
1556
1557 /* Handle implicit connection setup */
1558 if (unlikely(dest)) {
1559 rc = __tipc_sendmsg(sock, m, dlen);
1560 if (dlen && dlen == rc) {
1561 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1562 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1563 }
1564 return rc;
1565 }
1566
1567 do {
1568 rc = tipc_wait_for_cond(sock, &timeout,
1569 (!tsk->cong_link_cnt &&
1570 !tsk_conn_cong(tsk) &&
1571 tipc_sk_connected(sk)));
1572 if (unlikely(rc))
1573 break;
1574 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1575 blocks = tsk->snd_backlog;
1576 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1577 send <= maxnagle) {
1578 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1579 if (unlikely(rc < 0))
1580 break;
1581 blocks += rc;
1582 tsk->msg_acc++;
1583 if (blocks <= 64 && tsk->expect_ack) {
1584 tsk->snd_backlog = blocks;
1585 sent += send;
1586 break;
1587 } else if (blocks > 64) {
1588 tsk->pkt_cnt += skb_queue_len(txq);
1589 } else {
1590 skb = skb_peek_tail(txq);
1591 if (skb) {
1592 msg_set_ack_required(buf_msg(skb));
1593 tsk->expect_ack = true;
1594 } else {
1595 tsk->expect_ack = false;
1596 }
1597 tsk->msg_acc = 0;
1598 tsk->pkt_cnt = 0;
1599 }
1600 } else {
1601 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1602 if (unlikely(rc != send))
1603 break;
1604 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1605 }
1606 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1607 TIPC_DUMP_SK_SNDQ, " ");
1608 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1609 if (unlikely(rc == -ELINKCONG)) {
1610 tsk->cong_link_cnt = 1;
1611 rc = 0;
1612 }
1613 if (likely(!rc)) {
1614 tsk->snt_unacked += blocks;
1615 tsk->snd_backlog = 0;
1616 sent += send;
1617 }
1618 } while (sent < dlen && !rc);
1619
1620 return sent ? sent : rc;
1621}
1622
1623/**
1624 * tipc_send_packet - send a connection-oriented message
1625 * @sock: socket structure
1626 * @m: message to send
1627 * @dsz: length of data to be transmitted
1628 *
1629 * Used for SOCK_SEQPACKET messages.
1630 *
1631 * Returns the number of bytes sent on success, or errno otherwise
1632 */
1633static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1634{
1635 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1636 return -EMSGSIZE;
1637
1638 return tipc_sendstream(sock, m, dsz);
1639}
1640
1641/* tipc_sk_finish_conn - complete the setup of a connection
1642 */
1643static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1644 u32 peer_node)
1645{
1646 struct sock *sk = &tsk->sk;
1647 struct net *net = sock_net(sk);
1648 struct tipc_msg *msg = &tsk->phdr;
1649
1650 msg_set_syn(msg, 0);
1651 msg_set_destnode(msg, peer_node);
1652 msg_set_destport(msg, peer_port);
1653 msg_set_type(msg, TIPC_CONN_MSG);
1654 msg_set_lookup_scope(msg, 0);
1655 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1656
1657 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1658 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1659 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1660 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1661 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1662 tsk_set_nagle(tsk);
1663 __skb_queue_purge(&sk->sk_write_queue);
1664 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1665 return;
1666
1667 /* Fall back to message based flow control */
1668 tsk->rcv_win = FLOWCTL_MSG_WIN;
1669 tsk->snd_win = FLOWCTL_MSG_WIN;
1670}
1671
1672/**
1673 * tipc_sk_set_orig_addr - capture sender's address for received message
1674 * @m: descriptor for message info
1675 * @skb: received message
1676 *
1677 * Note: Address is not captured if not requested by receiver.
1678 */
1679static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1680{
1681 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1682 struct tipc_msg *hdr = buf_msg(skb);
1683
1684 if (!srcaddr)
1685 return;
1686
1687 srcaddr->sock.family = AF_TIPC;
1688 srcaddr->sock.addrtype = TIPC_ADDR_ID;
1689 srcaddr->sock.scope = 0;
1690 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1691 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1692 srcaddr->sock.addr.name.domain = 0;
1693 m->msg_namelen = sizeof(struct sockaddr_tipc);
1694
1695 if (!msg_in_group(hdr))
1696 return;
1697
1698 /* Group message users may also want to know sending member's id */
1699 srcaddr->member.family = AF_TIPC;
1700 srcaddr->member.addrtype = TIPC_ADDR_NAME;
1701 srcaddr->member.scope = 0;
1702 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1703 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1704 srcaddr->member.addr.name.domain = 0;
1705 m->msg_namelen = sizeof(*srcaddr);
1706}
1707
1708/**
1709 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1710 * @m: descriptor for message info
1711 * @skb: received message buffer
1712 * @tsk: TIPC port associated with message
1713 *
1714 * Note: Ancillary data is not captured if not requested by receiver.
1715 *
1716 * Returns 0 if successful, otherwise errno
1717 */
1718static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1719 struct tipc_sock *tsk)
1720{
1721 struct tipc_msg *msg;
1722 u32 anc_data[3];
1723 u32 err;
1724 u32 dest_type;
1725 int has_name;
1726 int res;
1727
1728 if (likely(m->msg_controllen == 0))
1729 return 0;
1730 msg = buf_msg(skb);
1731
1732 /* Optionally capture errored message object(s) */
1733 err = msg ? msg_errcode(msg) : 0;
1734 if (unlikely(err)) {
1735 anc_data[0] = err;
1736 anc_data[1] = msg_data_sz(msg);
1737 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1738 if (res)
1739 return res;
1740 if (anc_data[1]) {
1741 if (skb_linearize(skb))
1742 return -ENOMEM;
1743 msg = buf_msg(skb);
1744 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1745 msg_data(msg));
1746 if (res)
1747 return res;
1748 }
1749 }
1750
1751 /* Optionally capture message destination object */
1752 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1753 switch (dest_type) {
1754 case TIPC_NAMED_MSG:
1755 has_name = 1;
1756 anc_data[0] = msg_nametype(msg);
1757 anc_data[1] = msg_namelower(msg);
1758 anc_data[2] = msg_namelower(msg);
1759 break;
1760 case TIPC_MCAST_MSG:
1761 has_name = 1;
1762 anc_data[0] = msg_nametype(msg);
1763 anc_data[1] = msg_namelower(msg);
1764 anc_data[2] = msg_nameupper(msg);
1765 break;
1766 case TIPC_CONN_MSG:
1767 has_name = (tsk->conn_type != 0);
1768 anc_data[0] = tsk->conn_type;
1769 anc_data[1] = tsk->conn_instance;
1770 anc_data[2] = tsk->conn_instance;
1771 break;
1772 default:
1773 has_name = 0;
1774 }
1775 if (has_name) {
1776 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1777 if (res)
1778 return res;
1779 }
1780
1781 return 0;
1782}
1783
1784static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1785{
1786 struct sock *sk = &tsk->sk;
1787 struct sk_buff *skb = NULL;
1788 struct tipc_msg *msg;
1789 u32 peer_port = tsk_peer_port(tsk);
1790 u32 dnode = tsk_peer_node(tsk);
1791
1792 if (!tipc_sk_connected(sk))
1793 return NULL;
1794 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1795 dnode, tsk_own_node(tsk), peer_port,
1796 tsk->portid, TIPC_OK);
1797 if (!skb)
1798 return NULL;
1799 msg = buf_msg(skb);
1800 msg_set_conn_ack(msg, tsk->rcv_unacked);
1801 tsk->rcv_unacked = 0;
1802
1803 /* Adjust to and advertize the correct window limit */
1804 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1805 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1806 msg_set_adv_win(msg, tsk->rcv_win);
1807 }
1808 return skb;
1809}
1810
1811static void tipc_sk_send_ack(struct tipc_sock *tsk)
1812{
1813 struct sk_buff *skb;
1814
1815 skb = tipc_sk_build_ack(tsk);
1816 if (!skb)
1817 return;
1818
1819 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1820 msg_link_selector(buf_msg(skb)));
1821}
1822
1823static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1824{
1825 struct sock *sk = sock->sk;
1826 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1827 long timeo = *timeop;
1828 int err = sock_error(sk);
1829
1830 if (err)
1831 return err;
1832
1833 for (;;) {
1834 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1835 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1836 err = -ENOTCONN;
1837 break;
1838 }
1839 add_wait_queue(sk_sleep(sk), &wait);
1840 release_sock(sk);
1841 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1842 sched_annotate_sleep();
1843 lock_sock(sk);
1844 remove_wait_queue(sk_sleep(sk), &wait);
1845 }
1846 err = 0;
1847 if (!skb_queue_empty(&sk->sk_receive_queue))
1848 break;
1849 err = -EAGAIN;
1850 if (!timeo)
1851 break;
1852 err = sock_intr_errno(timeo);
1853 if (signal_pending(current))
1854 break;
1855
1856 err = sock_error(sk);
1857 if (err)
1858 break;
1859 }
1860 *timeop = timeo;
1861 return err;
1862}
1863
1864/**
1865 * tipc_recvmsg - receive packet-oriented message
1866 * @m: descriptor for message info
1867 * @buflen: length of user buffer area
1868 * @flags: receive flags
1869 *
1870 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1871 * If the complete message doesn't fit in user area, truncate it.
1872 *
1873 * Returns size of returned message data, errno otherwise
1874 */
1875static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1876 size_t buflen, int flags)
1877{
1878 struct sock *sk = sock->sk;
1879 bool connected = !tipc_sk_type_connectionless(sk);
1880 struct tipc_sock *tsk = tipc_sk(sk);
1881 int rc, err, hlen, dlen, copy;
1882 struct sk_buff_head xmitq;
1883 struct tipc_msg *hdr;
1884 struct sk_buff *skb;
1885 bool grp_evt;
1886 long timeout;
1887
1888 /* Catch invalid receive requests */
1889 if (unlikely(!buflen))
1890 return -EINVAL;
1891
1892 lock_sock(sk);
1893 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1894 rc = -ENOTCONN;
1895 goto exit;
1896 }
1897 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1898
1899 /* Step rcv queue to first msg with data or error; wait if necessary */
1900 do {
1901 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1902 if (unlikely(rc))
1903 goto exit;
1904 skb = skb_peek(&sk->sk_receive_queue);
1905 hdr = buf_msg(skb);
1906 dlen = msg_data_sz(hdr);
1907 hlen = msg_hdr_sz(hdr);
1908 err = msg_errcode(hdr);
1909 grp_evt = msg_is_grp_evt(hdr);
1910 if (likely(dlen || err))
1911 break;
1912 tsk_advance_rx_queue(sk);
1913 } while (1);
1914
1915 /* Collect msg meta data, including error code and rejected data */
1916 tipc_sk_set_orig_addr(m, skb);
1917 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1918 if (unlikely(rc))
1919 goto exit;
1920 hdr = buf_msg(skb);
1921
1922 /* Capture data if non-error msg, otherwise just set return value */
1923 if (likely(!err)) {
1924 copy = min_t(int, dlen, buflen);
1925 if (unlikely(copy != dlen))
1926 m->msg_flags |= MSG_TRUNC;
1927 rc = skb_copy_datagram_msg(skb, hlen, m, copy);
1928 } else {
1929 copy = 0;
1930 rc = 0;
1931 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
1932 rc = -ECONNRESET;
1933 }
1934 if (unlikely(rc))
1935 goto exit;
1936
1937 /* Mark message as group event if applicable */
1938 if (unlikely(grp_evt)) {
1939 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1940 m->msg_flags |= MSG_EOR;
1941 m->msg_flags |= MSG_OOB;
1942 copy = 0;
1943 }
1944
1945 /* Caption of data or error code/rejected data was successful */
1946 if (unlikely(flags & MSG_PEEK))
1947 goto exit;
1948
1949 /* Send group flow control advertisement when applicable */
1950 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1951 __skb_queue_head_init(&xmitq);
1952 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1953 msg_orignode(hdr), msg_origport(hdr),
1954 &xmitq);
1955 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1956 }
1957
1958 tsk_advance_rx_queue(sk);
1959
1960 if (likely(!connected))
1961 goto exit;
1962
1963 /* Send connection flow control advertisement when applicable */
1964 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1965 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1966 tipc_sk_send_ack(tsk);
1967exit:
1968 release_sock(sk);
1969 return rc ? rc : copy;
1970}
1971
1972/**
1973 * tipc_recvstream - receive stream-oriented data
1974 * @m: descriptor for message info
1975 * @buflen: total size of user buffer area
1976 * @flags: receive flags
1977 *
1978 * Used for SOCK_STREAM messages only. If not enough data is available
1979 * will optionally wait for more; never truncates data.
1980 *
1981 * Returns size of returned message data, errno otherwise
1982 */
1983static int tipc_recvstream(struct socket *sock, struct msghdr *m,
1984 size_t buflen, int flags)
1985{
1986 struct sock *sk = sock->sk;
1987 struct tipc_sock *tsk = tipc_sk(sk);
1988 struct sk_buff *skb;
1989 struct tipc_msg *hdr;
1990 struct tipc_skb_cb *skb_cb;
1991 bool peek = flags & MSG_PEEK;
1992 int offset, required, copy, copied = 0;
1993 int hlen, dlen, err, rc;
1994 long timeout;
1995
1996 /* Catch invalid receive attempts */
1997 if (unlikely(!buflen))
1998 return -EINVAL;
1999
2000 lock_sock(sk);
2001
2002 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2003 rc = -ENOTCONN;
2004 goto exit;
2005 }
2006 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2007 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2008
2009 do {
2010 /* Look at first msg in receive queue; wait if necessary */
2011 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2012 if (unlikely(rc))
2013 break;
2014 skb = skb_peek(&sk->sk_receive_queue);
2015 skb_cb = TIPC_SKB_CB(skb);
2016 hdr = buf_msg(skb);
2017 dlen = msg_data_sz(hdr);
2018 hlen = msg_hdr_sz(hdr);
2019 err = msg_errcode(hdr);
2020
2021 /* Discard any empty non-errored (SYN-) message */
2022 if (unlikely(!dlen && !err)) {
2023 tsk_advance_rx_queue(sk);
2024 continue;
2025 }
2026
2027 /* Collect msg meta data, incl. error code and rejected data */
2028 if (!copied) {
2029 tipc_sk_set_orig_addr(m, skb);
2030 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2031 if (rc)
2032 break;
2033 hdr = buf_msg(skb);
2034 }
2035
2036 /* Copy data if msg ok, otherwise return error/partial data */
2037 if (likely(!err)) {
2038 offset = skb_cb->bytes_read;
2039 copy = min_t(int, dlen - offset, buflen - copied);
2040 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2041 if (unlikely(rc))
2042 break;
2043 copied += copy;
2044 offset += copy;
2045 if (unlikely(offset < dlen)) {
2046 if (!peek)
2047 skb_cb->bytes_read = offset;
2048 break;
2049 }
2050 } else {
2051 rc = 0;
2052 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2053 rc = -ECONNRESET;
2054 if (copied || rc)
2055 break;
2056 }
2057
2058 if (unlikely(peek))
2059 break;
2060
2061 tsk_advance_rx_queue(sk);
2062
2063 /* Send connection flow control advertisement when applicable */
2064 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2065 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2066 tipc_sk_send_ack(tsk);
2067
2068 /* Exit if all requested data or FIN/error received */
2069 if (copied == buflen || err)
2070 break;
2071
2072 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2073exit:
2074 release_sock(sk);
2075 return copied ? copied : rc;
2076}
2077
2078/**
2079 * tipc_write_space - wake up thread if port congestion is released
2080 * @sk: socket
2081 */
2082static void tipc_write_space(struct sock *sk)
2083{
2084 struct socket_wq *wq;
2085
2086 rcu_read_lock();
2087 wq = rcu_dereference(sk->sk_wq);
2088 if (skwq_has_sleeper(wq))
2089 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2090 EPOLLWRNORM | EPOLLWRBAND);
2091 rcu_read_unlock();
2092}
2093
2094/**
2095 * tipc_data_ready - wake up threads to indicate messages have been received
2096 * @sk: socket
2097 */
2098static void tipc_data_ready(struct sock *sk)
2099{
2100 struct socket_wq *wq;
2101
2102 rcu_read_lock();
2103 wq = rcu_dereference(sk->sk_wq);
2104 if (skwq_has_sleeper(wq))
2105 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2106 EPOLLRDNORM | EPOLLRDBAND);
2107 rcu_read_unlock();
2108}
2109
2110static void tipc_sock_destruct(struct sock *sk)
2111{
2112 __skb_queue_purge(&sk->sk_receive_queue);
2113}
2114
2115static void tipc_sk_proto_rcv(struct sock *sk,
2116 struct sk_buff_head *inputq,
2117 struct sk_buff_head *xmitq)
2118{
2119 struct sk_buff *skb = __skb_dequeue(inputq);
2120 struct tipc_sock *tsk = tipc_sk(sk);
2121 struct tipc_msg *hdr = buf_msg(skb);
2122 struct tipc_group *grp = tsk->group;
2123 bool wakeup = false;
2124
2125 switch (msg_user(hdr)) {
2126 case CONN_MANAGER:
2127 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2128 return;
2129 case SOCK_WAKEUP:
2130 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2131 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2132 smp_wmb();
2133 tsk->cong_link_cnt--;
2134 wakeup = true;
2135 tipc_sk_push_backlog(tsk, false);
2136 break;
2137 case GROUP_PROTOCOL:
2138 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2139 break;
2140 case TOP_SRV:
2141 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2142 hdr, inputq, xmitq);
2143 break;
2144 default:
2145 break;
2146 }
2147
2148 if (wakeup)
2149 sk->sk_write_space(sk);
2150
2151 kfree_skb(skb);
2152}
2153
2154/**
2155 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2156 * @tsk: TIPC socket
2157 * @skb: pointer to message buffer.
2158 * @xmitq: for Nagle ACK if any
2159 * Returns true if message should be added to receive queue, false otherwise
2160 */
2161static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2162 struct sk_buff_head *xmitq)
2163{
2164 struct sock *sk = &tsk->sk;
2165 struct net *net = sock_net(sk);
2166 struct tipc_msg *hdr = buf_msg(skb);
2167 bool con_msg = msg_connected(hdr);
2168 u32 pport = tsk_peer_port(tsk);
2169 u32 pnode = tsk_peer_node(tsk);
2170 u32 oport = msg_origport(hdr);
2171 u32 onode = msg_orignode(hdr);
2172 int err = msg_errcode(hdr);
2173 unsigned long delay;
2174
2175 if (unlikely(msg_mcast(hdr)))
2176 return false;
2177 tsk->oneway = 0;
2178
2179 switch (sk->sk_state) {
2180 case TIPC_CONNECTING:
2181 /* Setup ACK */
2182 if (likely(con_msg)) {
2183 if (err)
2184 break;
2185 tipc_sk_finish_conn(tsk, oport, onode);
2186 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2187 /* ACK+ message with data is added to receive queue */
2188 if (msg_data_sz(hdr))
2189 return true;
2190 /* Empty ACK-, - wake up sleeping connect() and drop */
2191 sk->sk_state_change(sk);
2192 msg_set_dest_droppable(hdr, 1);
2193 return false;
2194 }
2195 /* Ignore connectionless message if not from listening socket */
2196 if (oport != pport || onode != pnode)
2197 return false;
2198
2199 /* Rejected SYN */
2200 if (err != TIPC_ERR_OVERLOAD)
2201 break;
2202
2203 /* Prepare for new setup attempt if we have a SYN clone */
2204 if (skb_queue_empty(&sk->sk_write_queue))
2205 break;
2206 get_random_bytes(&delay, 2);
2207 delay %= (tsk->conn_timeout / 4);
2208 delay = msecs_to_jiffies(delay + 100);
2209 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2210 return false;
2211 case TIPC_OPEN:
2212 case TIPC_DISCONNECTING:
2213 return false;
2214 case TIPC_LISTEN:
2215 /* Accept only SYN message */
2216 if (!msg_is_syn(hdr) &&
2217 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2218 return false;
2219 if (!con_msg && !err)
2220 return true;
2221 return false;
2222 case TIPC_ESTABLISHED:
2223 if (!skb_queue_empty(&sk->sk_write_queue))
2224 tipc_sk_push_backlog(tsk, false);
2225 /* Accept only connection-based messages sent by peer */
2226 if (likely(con_msg && !err && pport == oport &&
2227 pnode == onode)) {
2228 if (msg_ack_required(hdr)) {
2229 struct sk_buff *skb;
2230
2231 skb = tipc_sk_build_ack(tsk);
2232 if (skb) {
2233 msg_set_nagle_ack(buf_msg(skb));
2234 __skb_queue_tail(xmitq, skb);
2235 }
2236 }
2237 return true;
2238 }
2239 if (!tsk_peer_msg(tsk, hdr))
2240 return false;
2241 if (!err)
2242 return true;
2243 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2244 tipc_node_remove_conn(net, pnode, tsk->portid);
2245 sk->sk_state_change(sk);
2246 return true;
2247 default:
2248 pr_err("Unknown sk_state %u\n", sk->sk_state);
2249 }
2250 /* Abort connection setup attempt */
2251 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2252 sk->sk_err = ECONNREFUSED;
2253 sk->sk_state_change(sk);
2254 return true;
2255}
2256
2257/**
2258 * rcvbuf_limit - get proper overload limit of socket receive queue
2259 * @sk: socket
2260 * @skb: message
2261 *
2262 * For connection oriented messages, irrespective of importance,
2263 * default queue limit is 2 MB.
2264 *
2265 * For connectionless messages, queue limits are based on message
2266 * importance as follows:
2267 *
2268 * TIPC_LOW_IMPORTANCE (2 MB)
2269 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2270 * TIPC_HIGH_IMPORTANCE (8 MB)
2271 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2272 *
2273 * Returns overload limit according to corresponding message importance
2274 */
2275static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2276{
2277 struct tipc_sock *tsk = tipc_sk(sk);
2278 struct tipc_msg *hdr = buf_msg(skb);
2279
2280 if (unlikely(msg_in_group(hdr)))
2281 return READ_ONCE(sk->sk_rcvbuf);
2282
2283 if (unlikely(!msg_connected(hdr)))
2284 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2285
2286 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2287 return READ_ONCE(sk->sk_rcvbuf);
2288
2289 return FLOWCTL_MSG_LIM;
2290}
2291
2292/**
2293 * tipc_sk_filter_rcv - validate incoming message
2294 * @sk: socket
2295 * @skb: pointer to message.
2296 *
2297 * Enqueues message on receive queue if acceptable; optionally handles
2298 * disconnect indication for a connected socket.
2299 *
2300 * Called with socket lock already taken
2301 *
2302 */
2303static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2304 struct sk_buff_head *xmitq)
2305{
2306 bool sk_conn = !tipc_sk_type_connectionless(sk);
2307 struct tipc_sock *tsk = tipc_sk(sk);
2308 struct tipc_group *grp = tsk->group;
2309 struct tipc_msg *hdr = buf_msg(skb);
2310 struct net *net = sock_net(sk);
2311 struct sk_buff_head inputq;
2312 int mtyp = msg_type(hdr);
2313 int limit, err = TIPC_OK;
2314
2315 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2316 TIPC_SKB_CB(skb)->bytes_read = 0;
2317 __skb_queue_head_init(&inputq);
2318 __skb_queue_tail(&inputq, skb);
2319
2320 if (unlikely(!msg_isdata(hdr)))
2321 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2322
2323 if (unlikely(grp))
2324 tipc_group_filter_msg(grp, &inputq, xmitq);
2325
2326 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2327 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2328
2329 /* Validate and add to receive buffer if there is space */
2330 while ((skb = __skb_dequeue(&inputq))) {
2331 hdr = buf_msg(skb);
2332 limit = rcvbuf_limit(sk, skb);
2333 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2334 (!sk_conn && msg_connected(hdr)) ||
2335 (!grp && msg_in_group(hdr)))
2336 err = TIPC_ERR_NO_PORT;
2337 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2338 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2339 "err_overload2!");
2340 atomic_inc(&sk->sk_drops);
2341 err = TIPC_ERR_OVERLOAD;
2342 }
2343
2344 if (unlikely(err)) {
2345 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2346 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2347 "@filter_rcv!");
2348 __skb_queue_tail(xmitq, skb);
2349 }
2350 err = TIPC_OK;
2351 continue;
2352 }
2353 __skb_queue_tail(&sk->sk_receive_queue, skb);
2354 skb_set_owner_r(skb, sk);
2355 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2356 "rcvq >90% allocated!");
2357 sk->sk_data_ready(sk);
2358 }
2359}
2360
2361/**
2362 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2363 * @sk: socket
2364 * @skb: message
2365 *
2366 * Caller must hold socket lock
2367 */
2368static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2369{
2370 unsigned int before = sk_rmem_alloc_get(sk);
2371 struct sk_buff_head xmitq;
2372 unsigned int added;
2373
2374 __skb_queue_head_init(&xmitq);
2375
2376 tipc_sk_filter_rcv(sk, skb, &xmitq);
2377 added = sk_rmem_alloc_get(sk) - before;
2378 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2379
2380 /* Send pending response/rejected messages, if any */
2381 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2382 return 0;
2383}
2384
2385/**
2386 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2387 * inputq and try adding them to socket or backlog queue
2388 * @inputq: list of incoming buffers with potentially different destinations
2389 * @sk: socket where the buffers should be enqueued
2390 * @dport: port number for the socket
2391 *
2392 * Caller must hold socket lock
2393 */
2394static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2395 u32 dport, struct sk_buff_head *xmitq)
2396{
2397 unsigned long time_limit = jiffies + 2;
2398 struct sk_buff *skb;
2399 unsigned int lim;
2400 atomic_t *dcnt;
2401 u32 onode;
2402
2403 while (skb_queue_len(inputq)) {
2404 if (unlikely(time_after_eq(jiffies, time_limit)))
2405 return;
2406
2407 skb = tipc_skb_dequeue(inputq, dport);
2408 if (unlikely(!skb))
2409 return;
2410
2411 /* Add message directly to receive queue if possible */
2412 if (!sock_owned_by_user(sk)) {
2413 tipc_sk_filter_rcv(sk, skb, xmitq);
2414 continue;
2415 }
2416
2417 /* Try backlog, compensating for double-counted bytes */
2418 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2419 if (!sk->sk_backlog.len)
2420 atomic_set(dcnt, 0);
2421 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2422 if (likely(!sk_add_backlog(sk, skb, lim))) {
2423 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2424 "bklg & rcvq >90% allocated!");
2425 continue;
2426 }
2427
2428 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2429 /* Overload => reject message back to sender */
2430 onode = tipc_own_addr(sock_net(sk));
2431 atomic_inc(&sk->sk_drops);
2432 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2433 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2434 "@sk_enqueue!");
2435 __skb_queue_tail(xmitq, skb);
2436 }
2437 break;
2438 }
2439}
2440
2441/**
2442 * tipc_sk_rcv - handle a chain of incoming buffers
2443 * @inputq: buffer list containing the buffers
2444 * Consumes all buffers in list until inputq is empty
2445 * Note: may be called in multiple threads referring to the same queue
2446 */
2447void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2448{
2449 struct sk_buff_head xmitq;
2450 u32 dnode, dport = 0;
2451 int err;
2452 struct tipc_sock *tsk;
2453 struct sock *sk;
2454 struct sk_buff *skb;
2455
2456 __skb_queue_head_init(&xmitq);
2457 while (skb_queue_len(inputq)) {
2458 dport = tipc_skb_peek_port(inputq, dport);
2459 tsk = tipc_sk_lookup(net, dport);
2460
2461 if (likely(tsk)) {
2462 sk = &tsk->sk;
2463 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2464 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2465 spin_unlock_bh(&sk->sk_lock.slock);
2466 }
2467 /* Send pending response/rejected messages, if any */
2468 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2469 sock_put(sk);
2470 continue;
2471 }
2472 /* No destination socket => dequeue skb if still there */
2473 skb = tipc_skb_dequeue(inputq, dport);
2474 if (!skb)
2475 return;
2476
2477 /* Try secondary lookup if unresolved named message */
2478 err = TIPC_ERR_NO_PORT;
2479 if (tipc_msg_lookup_dest(net, skb, &err))
2480 goto xmit;
2481
2482 /* Prepare for message rejection */
2483 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2484 continue;
2485
2486 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2487xmit:
2488 dnode = msg_destnode(buf_msg(skb));
2489 tipc_node_xmit_skb(net, skb, dnode, dport);
2490 }
2491}
2492
2493static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2494{
2495 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2496 struct sock *sk = sock->sk;
2497 int done;
2498
2499 do {
2500 int err = sock_error(sk);
2501 if (err)
2502 return err;
2503 if (!*timeo_p)
2504 return -ETIMEDOUT;
2505 if (signal_pending(current))
2506 return sock_intr_errno(*timeo_p);
2507 if (sk->sk_state == TIPC_DISCONNECTING)
2508 break;
2509
2510 add_wait_queue(sk_sleep(sk), &wait);
2511 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2512 &wait);
2513 remove_wait_queue(sk_sleep(sk), &wait);
2514 } while (!done);
2515 return 0;
2516}
2517
2518static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2519{
2520 if (addr->family != AF_TIPC)
2521 return false;
2522 if (addr->addrtype == TIPC_SERVICE_RANGE)
2523 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2524 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2525 addr->addrtype == TIPC_SOCKET_ADDR);
2526}
2527
2528/**
2529 * tipc_connect - establish a connection to another TIPC port
2530 * @sock: socket structure
2531 * @dest: socket address for destination port
2532 * @destlen: size of socket address data structure
2533 * @flags: file-related flags associated with socket
2534 *
2535 * Returns 0 on success, errno otherwise
2536 */
2537static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2538 int destlen, int flags)
2539{
2540 struct sock *sk = sock->sk;
2541 struct tipc_sock *tsk = tipc_sk(sk);
2542 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2543 struct msghdr m = {NULL,};
2544 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2545 int previous;
2546 int res = 0;
2547
2548 if (destlen != sizeof(struct sockaddr_tipc))
2549 return -EINVAL;
2550
2551 lock_sock(sk);
2552
2553 if (tsk->group) {
2554 res = -EINVAL;
2555 goto exit;
2556 }
2557
2558 if (dst->family == AF_UNSPEC) {
2559 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2560 if (!tipc_sk_type_connectionless(sk))
2561 res = -EINVAL;
2562 goto exit;
2563 }
2564 if (!tipc_sockaddr_is_sane(dst)) {
2565 res = -EINVAL;
2566 goto exit;
2567 }
2568 /* DGRAM/RDM connect(), just save the destaddr */
2569 if (tipc_sk_type_connectionless(sk)) {
2570 memcpy(&tsk->peer, dest, destlen);
2571 goto exit;
2572 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2573 res = -EINVAL;
2574 goto exit;
2575 }
2576
2577 previous = sk->sk_state;
2578
2579 switch (sk->sk_state) {
2580 case TIPC_OPEN:
2581 /* Send a 'SYN-' to destination */
2582 m.msg_name = dest;
2583 m.msg_namelen = destlen;
2584
2585 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2586 * indicate send_msg() is never blocked.
2587 */
2588 if (!timeout)
2589 m.msg_flags = MSG_DONTWAIT;
2590
2591 res = __tipc_sendmsg(sock, &m, 0);
2592 if ((res < 0) && (res != -EWOULDBLOCK))
2593 goto exit;
2594
2595 /* Just entered TIPC_CONNECTING state; the only
2596 * difference is that return value in non-blocking
2597 * case is EINPROGRESS, rather than EALREADY.
2598 */
2599 res = -EINPROGRESS;
2600 fallthrough;
2601 case TIPC_CONNECTING:
2602 if (!timeout) {
2603 if (previous == TIPC_CONNECTING)
2604 res = -EALREADY;
2605 goto exit;
2606 }
2607 timeout = msecs_to_jiffies(timeout);
2608 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2609 res = tipc_wait_for_connect(sock, &timeout);
2610 break;
2611 case TIPC_ESTABLISHED:
2612 res = -EISCONN;
2613 break;
2614 default:
2615 res = -EINVAL;
2616 }
2617
2618exit:
2619 release_sock(sk);
2620 return res;
2621}
2622
2623/**
2624 * tipc_listen - allow socket to listen for incoming connections
2625 * @sock: socket structure
2626 * @len: (unused)
2627 *
2628 * Returns 0 on success, errno otherwise
2629 */
2630static int tipc_listen(struct socket *sock, int len)
2631{
2632 struct sock *sk = sock->sk;
2633 int res;
2634
2635 lock_sock(sk);
2636 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2637 release_sock(sk);
2638
2639 return res;
2640}
2641
2642static int tipc_wait_for_accept(struct socket *sock, long timeo)
2643{
2644 struct sock *sk = sock->sk;
2645 DEFINE_WAIT(wait);
2646 int err;
2647
2648 /* True wake-one mechanism for incoming connections: only
2649 * one process gets woken up, not the 'whole herd'.
2650 * Since we do not 'race & poll' for established sockets
2651 * anymore, the common case will execute the loop only once.
2652 */
2653 for (;;) {
2654 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
2655 TASK_INTERRUPTIBLE);
2656 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2657 release_sock(sk);
2658 timeo = schedule_timeout(timeo);
2659 lock_sock(sk);
2660 }
2661 err = 0;
2662 if (!skb_queue_empty(&sk->sk_receive_queue))
2663 break;
2664 err = -EAGAIN;
2665 if (!timeo)
2666 break;
2667 err = sock_intr_errno(timeo);
2668 if (signal_pending(current))
2669 break;
2670 }
2671 finish_wait(sk_sleep(sk), &wait);
2672 return err;
2673}
2674
2675/**
2676 * tipc_accept - wait for connection request
2677 * @sock: listening socket
2678 * @new_sock: new socket that is to be connected
2679 * @flags: file-related flags associated with socket
2680 *
2681 * Returns 0 on success, errno otherwise
2682 */
2683static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2684 bool kern)
2685{
2686 struct sock *new_sk, *sk = sock->sk;
2687 struct sk_buff *buf;
2688 struct tipc_sock *new_tsock;
2689 struct tipc_msg *msg;
2690 long timeo;
2691 int res;
2692
2693 lock_sock(sk);
2694
2695 if (sk->sk_state != TIPC_LISTEN) {
2696 res = -EINVAL;
2697 goto exit;
2698 }
2699 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2700 res = tipc_wait_for_accept(sock, timeo);
2701 if (res)
2702 goto exit;
2703
2704 buf = skb_peek(&sk->sk_receive_queue);
2705
2706 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2707 if (res)
2708 goto exit;
2709 security_sk_clone(sock->sk, new_sock->sk);
2710
2711 new_sk = new_sock->sk;
2712 new_tsock = tipc_sk(new_sk);
2713 msg = buf_msg(buf);
2714
2715 /* we lock on new_sk; but lockdep sees the lock on sk */
2716 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2717
2718 /*
2719 * Reject any stray messages received by new socket
2720 * before the socket lock was taken (very, very unlikely)
2721 */
2722 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2723
2724 /* Connect new socket to it's peer */
2725 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2726
2727 tsk_set_importance(new_sk, msg_importance(msg));
2728 if (msg_named(msg)) {
2729 new_tsock->conn_type = msg_nametype(msg);
2730 new_tsock->conn_instance = msg_nameinst(msg);
2731 }
2732
2733 /*
2734 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2735 * Respond to 'SYN+' by queuing it on new socket.
2736 */
2737 if (!msg_data_sz(msg)) {
2738 struct msghdr m = {NULL,};
2739
2740 tsk_advance_rx_queue(sk);
2741 __tipc_sendstream(new_sock, &m, 0);
2742 } else {
2743 __skb_dequeue(&sk->sk_receive_queue);
2744 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2745 skb_set_owner_r(buf, new_sk);
2746 }
2747 release_sock(new_sk);
2748exit:
2749 release_sock(sk);
2750 return res;
2751}
2752
2753/**
2754 * tipc_shutdown - shutdown socket connection
2755 * @sock: socket structure
2756 * @how: direction to close (must be SHUT_RDWR)
2757 *
2758 * Terminates connection (if necessary), then purges socket's receive queue.
2759 *
2760 * Returns 0 on success, errno otherwise
2761 */
2762static int tipc_shutdown(struct socket *sock, int how)
2763{
2764 struct sock *sk = sock->sk;
2765 int res;
2766
2767 if (how != SHUT_RDWR)
2768 return -EINVAL;
2769
2770 lock_sock(sk);
2771
2772 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2773 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2774 sk->sk_shutdown = SHUTDOWN_MASK;
2775
2776 if (sk->sk_state == TIPC_DISCONNECTING) {
2777 /* Discard any unreceived messages */
2778 __skb_queue_purge(&sk->sk_receive_queue);
2779
2780 res = 0;
2781 } else {
2782 res = -ENOTCONN;
2783 }
2784 /* Wake up anyone sleeping in poll. */
2785 sk->sk_state_change(sk);
2786
2787 release_sock(sk);
2788 return res;
2789}
2790
2791static void tipc_sk_check_probing_state(struct sock *sk,
2792 struct sk_buff_head *list)
2793{
2794 struct tipc_sock *tsk = tipc_sk(sk);
2795 u32 pnode = tsk_peer_node(tsk);
2796 u32 pport = tsk_peer_port(tsk);
2797 u32 self = tsk_own_node(tsk);
2798 u32 oport = tsk->portid;
2799 struct sk_buff *skb;
2800
2801 if (tsk->probe_unacked) {
2802 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2803 sk->sk_err = ECONNABORTED;
2804 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2805 sk->sk_state_change(sk);
2806 return;
2807 }
2808 /* Prepare new probe */
2809 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2810 pnode, self, pport, oport, TIPC_OK);
2811 if (skb)
2812 __skb_queue_tail(list, skb);
2813 tsk->probe_unacked = true;
2814 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2815}
2816
2817static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2818{
2819 struct tipc_sock *tsk = tipc_sk(sk);
2820
2821 /* Try again later if dest link is congested */
2822 if (tsk->cong_link_cnt) {
2823 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100));
2824 return;
2825 }
2826 /* Prepare SYN for retransmit */
2827 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2828}
2829
2830static void tipc_sk_timeout(struct timer_list *t)
2831{
2832 struct sock *sk = from_timer(sk, t, sk_timer);
2833 struct tipc_sock *tsk = tipc_sk(sk);
2834 u32 pnode = tsk_peer_node(tsk);
2835 struct sk_buff_head list;
2836 int rc = 0;
2837
2838 __skb_queue_head_init(&list);
2839 bh_lock_sock(sk);
2840
2841 /* Try again later if socket is busy */
2842 if (sock_owned_by_user(sk)) {
2843 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2844 bh_unlock_sock(sk);
2845 sock_put(sk);
2846 return;
2847 }
2848
2849 if (sk->sk_state == TIPC_ESTABLISHED)
2850 tipc_sk_check_probing_state(sk, &list);
2851 else if (sk->sk_state == TIPC_CONNECTING)
2852 tipc_sk_retry_connect(sk, &list);
2853
2854 bh_unlock_sock(sk);
2855
2856 if (!skb_queue_empty(&list))
2857 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2858
2859 /* SYN messages may cause link congestion */
2860 if (rc == -ELINKCONG) {
2861 tipc_dest_push(&tsk->cong_links, pnode, 0);
2862 tsk->cong_link_cnt = 1;
2863 }
2864 sock_put(sk);
2865}
2866
2867static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2868 struct tipc_name_seq const *seq)
2869{
2870 struct sock *sk = &tsk->sk;
2871 struct net *net = sock_net(sk);
2872 struct publication *publ;
2873 u32 key;
2874
2875 if (scope != TIPC_NODE_SCOPE)
2876 scope = TIPC_CLUSTER_SCOPE;
2877
2878 if (tipc_sk_connected(sk))
2879 return -EINVAL;
2880 key = tsk->portid + tsk->pub_count + 1;
2881 if (key == tsk->portid)
2882 return -EADDRINUSE;
2883
2884 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2885 scope, tsk->portid, key);
2886 if (unlikely(!publ))
2887 return -EINVAL;
2888
2889 list_add(&publ->binding_sock, &tsk->publications);
2890 tsk->pub_count++;
2891 tsk->published = 1;
2892 return 0;
2893}
2894
2895static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2896 struct tipc_name_seq const *seq)
2897{
2898 struct net *net = sock_net(&tsk->sk);
2899 struct publication *publ;
2900 struct publication *safe;
2901 int rc = -EINVAL;
2902
2903 if (scope != TIPC_NODE_SCOPE)
2904 scope = TIPC_CLUSTER_SCOPE;
2905
2906 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) {
2907 if (seq) {
2908 if (publ->scope != scope)
2909 continue;
2910 if (publ->type != seq->type)
2911 continue;
2912 if (publ->lower != seq->lower)
2913 continue;
2914 if (publ->upper != seq->upper)
2915 break;
2916 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2917 publ->upper, publ->key);
2918 rc = 0;
2919 break;
2920 }
2921 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2922 publ->upper, publ->key);
2923 rc = 0;
2924 }
2925 if (list_empty(&tsk->publications))
2926 tsk->published = 0;
2927 return rc;
2928}
2929
2930/* tipc_sk_reinit: set non-zero address in all existing sockets
2931 * when we go from standalone to network mode.
2932 */
2933void tipc_sk_reinit(struct net *net)
2934{
2935 struct tipc_net *tn = net_generic(net, tipc_net_id);
2936 struct rhashtable_iter iter;
2937 struct tipc_sock *tsk;
2938 struct tipc_msg *msg;
2939
2940 rhashtable_walk_enter(&tn->sk_rht, &iter);
2941
2942 do {
2943 rhashtable_walk_start(&iter);
2944
2945 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2946 sock_hold(&tsk->sk);
2947 rhashtable_walk_stop(&iter);
2948 lock_sock(&tsk->sk);
2949 msg = &tsk->phdr;
2950 msg_set_prevnode(msg, tipc_own_addr(net));
2951 msg_set_orignode(msg, tipc_own_addr(net));
2952 release_sock(&tsk->sk);
2953 rhashtable_walk_start(&iter);
2954 sock_put(&tsk->sk);
2955 }
2956
2957 rhashtable_walk_stop(&iter);
2958 } while (tsk == ERR_PTR(-EAGAIN));
2959
2960 rhashtable_walk_exit(&iter);
2961}
2962
2963static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2964{
2965 struct tipc_net *tn = net_generic(net, tipc_net_id);
2966 struct tipc_sock *tsk;
2967
2968 rcu_read_lock();
2969 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
2970 if (tsk)
2971 sock_hold(&tsk->sk);
2972 rcu_read_unlock();
2973
2974 return tsk;
2975}
2976
2977static int tipc_sk_insert(struct tipc_sock *tsk)
2978{
2979 struct sock *sk = &tsk->sk;
2980 struct net *net = sock_net(sk);
2981 struct tipc_net *tn = net_generic(net, tipc_net_id);
2982 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2983 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2984
2985 while (remaining--) {
2986 portid++;
2987 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2988 portid = TIPC_MIN_PORT;
2989 tsk->portid = portid;
2990 sock_hold(&tsk->sk);
2991 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2992 tsk_rht_params))
2993 return 0;
2994 sock_put(&tsk->sk);
2995 }
2996
2997 return -1;
2998}
2999
3000static void tipc_sk_remove(struct tipc_sock *tsk)
3001{
3002 struct sock *sk = &tsk->sk;
3003 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3004
3005 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3006 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3007 __sock_put(sk);
3008 }
3009}
3010
3011static const struct rhashtable_params tsk_rht_params = {
3012 .nelem_hint = 192,
3013 .head_offset = offsetof(struct tipc_sock, node),
3014 .key_offset = offsetof(struct tipc_sock, portid),
3015 .key_len = sizeof(u32), /* portid */
3016 .max_size = 1048576,
3017 .min_size = 256,
3018 .automatic_shrinking = true,
3019};
3020
3021int tipc_sk_rht_init(struct net *net)
3022{
3023 struct tipc_net *tn = net_generic(net, tipc_net_id);
3024
3025 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3026}
3027
3028void tipc_sk_rht_destroy(struct net *net)
3029{
3030 struct tipc_net *tn = net_generic(net, tipc_net_id);
3031
3032 /* Wait for socket readers to complete */
3033 synchronize_net();
3034
3035 rhashtable_destroy(&tn->sk_rht);
3036}
3037
3038static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3039{
3040 struct net *net = sock_net(&tsk->sk);
3041 struct tipc_group *grp = tsk->group;
3042 struct tipc_msg *hdr = &tsk->phdr;
3043 struct tipc_name_seq seq;
3044 int rc;
3045
3046 if (mreq->type < TIPC_RESERVED_TYPES)
3047 return -EACCES;
3048 if (mreq->scope > TIPC_NODE_SCOPE)
3049 return -EINVAL;
3050 if (grp)
3051 return -EACCES;
3052 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3053 if (!grp)
3054 return -ENOMEM;
3055 tsk->group = grp;
3056 msg_set_lookup_scope(hdr, mreq->scope);
3057 msg_set_nametype(hdr, mreq->type);
3058 msg_set_dest_droppable(hdr, true);
3059 seq.type = mreq->type;
3060 seq.lower = mreq->instance;
3061 seq.upper = seq.lower;
3062 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope);
3063 rc = tipc_sk_publish(tsk, mreq->scope, &seq);
3064 if (rc) {
3065 tipc_group_delete(net, grp);
3066 tsk->group = NULL;
3067 return rc;
3068 }
3069 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3070 tsk->mc_method.rcast = true;
3071 tsk->mc_method.mandatory = true;
3072 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3073 return rc;
3074}
3075
3076static int tipc_sk_leave(struct tipc_sock *tsk)
3077{
3078 struct net *net = sock_net(&tsk->sk);
3079 struct tipc_group *grp = tsk->group;
3080 struct tipc_name_seq seq;
3081 int scope;
3082
3083 if (!grp)
3084 return -EINVAL;
3085 tipc_group_self(grp, &seq, &scope);
3086 tipc_group_delete(net, grp);
3087 tsk->group = NULL;
3088 tipc_sk_withdraw(tsk, scope, &seq);
3089 return 0;
3090}
3091
3092/**
3093 * tipc_setsockopt - set socket option
3094 * @sock: socket structure
3095 * @lvl: option level
3096 * @opt: option identifier
3097 * @ov: pointer to new option value
3098 * @ol: length of option value
3099 *
3100 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3101 * (to ease compatibility).
3102 *
3103 * Returns 0 on success, errno otherwise
3104 */
3105static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3106 sockptr_t ov, unsigned int ol)
3107{
3108 struct sock *sk = sock->sk;
3109 struct tipc_sock *tsk = tipc_sk(sk);
3110 struct tipc_group_req mreq;
3111 u32 value = 0;
3112 int res = 0;
3113
3114 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3115 return 0;
3116 if (lvl != SOL_TIPC)
3117 return -ENOPROTOOPT;
3118
3119 switch (opt) {
3120 case TIPC_IMPORTANCE:
3121 case TIPC_SRC_DROPPABLE:
3122 case TIPC_DEST_DROPPABLE:
3123 case TIPC_CONN_TIMEOUT:
3124 case TIPC_NODELAY:
3125 if (ol < sizeof(value))
3126 return -EINVAL;
3127 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3128 return -EFAULT;
3129 break;
3130 case TIPC_GROUP_JOIN:
3131 if (ol < sizeof(mreq))
3132 return -EINVAL;
3133 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3134 return -EFAULT;
3135 break;
3136 default:
3137 if (!sockptr_is_null(ov) || ol)
3138 return -EINVAL;
3139 }
3140
3141 lock_sock(sk);
3142
3143 switch (opt) {
3144 case TIPC_IMPORTANCE:
3145 res = tsk_set_importance(sk, value);
3146 break;
3147 case TIPC_SRC_DROPPABLE:
3148 if (sock->type != SOCK_STREAM)
3149 tsk_set_unreliable(tsk, value);
3150 else
3151 res = -ENOPROTOOPT;
3152 break;
3153 case TIPC_DEST_DROPPABLE:
3154 tsk_set_unreturnable(tsk, value);
3155 break;
3156 case TIPC_CONN_TIMEOUT:
3157 tipc_sk(sk)->conn_timeout = value;
3158 break;
3159 case TIPC_MCAST_BROADCAST:
3160 tsk->mc_method.rcast = false;
3161 tsk->mc_method.mandatory = true;
3162 break;
3163 case TIPC_MCAST_REPLICAST:
3164 tsk->mc_method.rcast = true;
3165 tsk->mc_method.mandatory = true;
3166 break;
3167 case TIPC_GROUP_JOIN:
3168 res = tipc_sk_join(tsk, &mreq);
3169 break;
3170 case TIPC_GROUP_LEAVE:
3171 res = tipc_sk_leave(tsk);
3172 break;
3173 case TIPC_NODELAY:
3174 tsk->nodelay = !!value;
3175 tsk_set_nagle(tsk);
3176 break;
3177 default:
3178 res = -EINVAL;
3179 }
3180
3181 release_sock(sk);
3182
3183 return res;
3184}
3185
3186/**
3187 * tipc_getsockopt - get socket option
3188 * @sock: socket structure
3189 * @lvl: option level
3190 * @opt: option identifier
3191 * @ov: receptacle for option value
3192 * @ol: receptacle for length of option value
3193 *
3194 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3195 * (to ease compatibility).
3196 *
3197 * Returns 0 on success, errno otherwise
3198 */
3199static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3200 char __user *ov, int __user *ol)
3201{
3202 struct sock *sk = sock->sk;
3203 struct tipc_sock *tsk = tipc_sk(sk);
3204 struct tipc_name_seq seq;
3205 int len, scope;
3206 u32 value;
3207 int res;
3208
3209 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3210 return put_user(0, ol);
3211 if (lvl != SOL_TIPC)
3212 return -ENOPROTOOPT;
3213 res = get_user(len, ol);
3214 if (res)
3215 return res;
3216
3217 lock_sock(sk);
3218
3219 switch (opt) {
3220 case TIPC_IMPORTANCE:
3221 value = tsk_importance(tsk);
3222 break;
3223 case TIPC_SRC_DROPPABLE:
3224 value = tsk_unreliable(tsk);
3225 break;
3226 case TIPC_DEST_DROPPABLE:
3227 value = tsk_unreturnable(tsk);
3228 break;
3229 case TIPC_CONN_TIMEOUT:
3230 value = tsk->conn_timeout;
3231 /* no need to set "res", since already 0 at this point */
3232 break;
3233 case TIPC_NODE_RECVQ_DEPTH:
3234 value = 0; /* was tipc_queue_size, now obsolete */
3235 break;
3236 case TIPC_SOCK_RECVQ_DEPTH:
3237 value = skb_queue_len(&sk->sk_receive_queue);
3238 break;
3239 case TIPC_SOCK_RECVQ_USED:
3240 value = sk_rmem_alloc_get(sk);
3241 break;
3242 case TIPC_GROUP_JOIN:
3243 seq.type = 0;
3244 if (tsk->group)
3245 tipc_group_self(tsk->group, &seq, &scope);
3246 value = seq.type;
3247 break;
3248 default:
3249 res = -EINVAL;
3250 }
3251
3252 release_sock(sk);
3253
3254 if (res)
3255 return res; /* "get" failed */
3256
3257 if (len < sizeof(value))
3258 return -EINVAL;
3259
3260 if (copy_to_user(ov, &value, sizeof(value)))
3261 return -EFAULT;
3262
3263 return put_user(sizeof(value), ol);
3264}
3265
3266static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3267{
3268 struct net *net = sock_net(sock->sk);
3269 struct tipc_sioc_nodeid_req nr = {0};
3270 struct tipc_sioc_ln_req lnr;
3271 void __user *argp = (void __user *)arg;
3272
3273 switch (cmd) {
3274 case SIOCGETLINKNAME:
3275 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3276 return -EFAULT;
3277 if (!tipc_node_get_linkname(net,
3278 lnr.bearer_id & 0xffff, lnr.peer,
3279 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3280 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3281 return -EFAULT;
3282 return 0;
3283 }
3284 return -EADDRNOTAVAIL;
3285 case SIOCGETNODEID:
3286 if (copy_from_user(&nr, argp, sizeof(nr)))
3287 return -EFAULT;
3288 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3289 return -EADDRNOTAVAIL;
3290 if (copy_to_user(argp, &nr, sizeof(nr)))
3291 return -EFAULT;
3292 return 0;
3293 default:
3294 return -ENOIOCTLCMD;
3295 }
3296}
3297
3298static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3299{
3300 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3301 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3302 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3303
3304 tsk1->peer.family = AF_TIPC;
3305 tsk1->peer.addrtype = TIPC_ADDR_ID;
3306 tsk1->peer.scope = TIPC_NODE_SCOPE;
3307 tsk1->peer.addr.id.ref = tsk2->portid;
3308 tsk1->peer.addr.id.node = onode;
3309 tsk2->peer.family = AF_TIPC;
3310 tsk2->peer.addrtype = TIPC_ADDR_ID;
3311 tsk2->peer.scope = TIPC_NODE_SCOPE;
3312 tsk2->peer.addr.id.ref = tsk1->portid;
3313 tsk2->peer.addr.id.node = onode;
3314
3315 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3316 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3317 return 0;
3318}
3319
3320/* Protocol switches for the various types of TIPC sockets */
3321
3322static const struct proto_ops msg_ops = {
3323 .owner = THIS_MODULE,
3324 .family = AF_TIPC,
3325 .release = tipc_release,
3326 .bind = tipc_bind,
3327 .connect = tipc_connect,
3328 .socketpair = tipc_socketpair,
3329 .accept = sock_no_accept,
3330 .getname = tipc_getname,
3331 .poll = tipc_poll,
3332 .ioctl = tipc_ioctl,
3333 .listen = sock_no_listen,
3334 .shutdown = tipc_shutdown,
3335 .setsockopt = tipc_setsockopt,
3336 .getsockopt = tipc_getsockopt,
3337 .sendmsg = tipc_sendmsg,
3338 .recvmsg = tipc_recvmsg,
3339 .mmap = sock_no_mmap,
3340 .sendpage = sock_no_sendpage
3341};
3342
3343static const struct proto_ops packet_ops = {
3344 .owner = THIS_MODULE,
3345 .family = AF_TIPC,
3346 .release = tipc_release,
3347 .bind = tipc_bind,
3348 .connect = tipc_connect,
3349 .socketpair = tipc_socketpair,
3350 .accept = tipc_accept,
3351 .getname = tipc_getname,
3352 .poll = tipc_poll,
3353 .ioctl = tipc_ioctl,
3354 .listen = tipc_listen,
3355 .shutdown = tipc_shutdown,
3356 .setsockopt = tipc_setsockopt,
3357 .getsockopt = tipc_getsockopt,
3358 .sendmsg = tipc_send_packet,
3359 .recvmsg = tipc_recvmsg,
3360 .mmap = sock_no_mmap,
3361 .sendpage = sock_no_sendpage
3362};
3363
3364static const struct proto_ops stream_ops = {
3365 .owner = THIS_MODULE,
3366 .family = AF_TIPC,
3367 .release = tipc_release,
3368 .bind = tipc_bind,
3369 .connect = tipc_connect,
3370 .socketpair = tipc_socketpair,
3371 .accept = tipc_accept,
3372 .getname = tipc_getname,
3373 .poll = tipc_poll,
3374 .ioctl = tipc_ioctl,
3375 .listen = tipc_listen,
3376 .shutdown = tipc_shutdown,
3377 .setsockopt = tipc_setsockopt,
3378 .getsockopt = tipc_getsockopt,
3379 .sendmsg = tipc_sendstream,
3380 .recvmsg = tipc_recvstream,
3381 .mmap = sock_no_mmap,
3382 .sendpage = sock_no_sendpage
3383};
3384
3385static const struct net_proto_family tipc_family_ops = {
3386 .owner = THIS_MODULE,
3387 .family = AF_TIPC,
3388 .create = tipc_sk_create
3389};
3390
3391static struct proto tipc_proto = {
3392 .name = "TIPC",
3393 .owner = THIS_MODULE,
3394 .obj_size = sizeof(struct tipc_sock),
3395 .sysctl_rmem = sysctl_tipc_rmem
3396};
3397
3398/**
3399 * tipc_socket_init - initialize TIPC socket interface
3400 *
3401 * Returns 0 on success, errno otherwise
3402 */
3403int tipc_socket_init(void)
3404{
3405 int res;
3406
3407 res = proto_register(&tipc_proto, 1);
3408 if (res) {
3409 pr_err("Failed to register TIPC protocol type\n");
3410 goto out;
3411 }
3412
3413 res = sock_register(&tipc_family_ops);
3414 if (res) {
3415 pr_err("Failed to register TIPC socket type\n");
3416 proto_unregister(&tipc_proto);
3417 goto out;
3418 }
3419 out:
3420 return res;
3421}
3422
3423/**
3424 * tipc_socket_stop - stop TIPC socket interface
3425 */
3426void tipc_socket_stop(void)
3427{
3428 sock_unregister(tipc_family_ops.family);
3429 proto_unregister(&tipc_proto);
3430}
3431
3432/* Caller should hold socket lock for the passed tipc socket. */
3433static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3434{
3435 u32 peer_node;
3436 u32 peer_port;
3437 struct nlattr *nest;
3438
3439 peer_node = tsk_peer_node(tsk);
3440 peer_port = tsk_peer_port(tsk);
3441
3442 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3443 if (!nest)
3444 return -EMSGSIZE;
3445
3446 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3447 goto msg_full;
3448 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3449 goto msg_full;
3450
3451 if (tsk->conn_type != 0) {
3452 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3453 goto msg_full;
3454 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
3455 goto msg_full;
3456 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
3457 goto msg_full;
3458 }
3459 nla_nest_end(skb, nest);
3460
3461 return 0;
3462
3463msg_full:
3464 nla_nest_cancel(skb, nest);
3465
3466 return -EMSGSIZE;
3467}
3468
3469static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3470 *tsk)
3471{
3472 struct net *net = sock_net(skb->sk);
3473 struct sock *sk = &tsk->sk;
3474
3475 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3476 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3477 return -EMSGSIZE;
3478
3479 if (tipc_sk_connected(sk)) {
3480 if (__tipc_nl_add_sk_con(skb, tsk))
3481 return -EMSGSIZE;
3482 } else if (!list_empty(&tsk->publications)) {
3483 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3484 return -EMSGSIZE;
3485 }
3486 return 0;
3487}
3488
3489/* Caller should hold socket lock for the passed tipc socket. */
3490static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3491 struct tipc_sock *tsk)
3492{
3493 struct nlattr *attrs;
3494 void *hdr;
3495
3496 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3497 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3498 if (!hdr)
3499 goto msg_cancel;
3500
3501 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3502 if (!attrs)
3503 goto genlmsg_cancel;
3504
3505 if (__tipc_nl_add_sk_info(skb, tsk))
3506 goto attr_msg_cancel;
3507
3508 nla_nest_end(skb, attrs);
3509 genlmsg_end(skb, hdr);
3510
3511 return 0;
3512
3513attr_msg_cancel:
3514 nla_nest_cancel(skb, attrs);
3515genlmsg_cancel:
3516 genlmsg_cancel(skb, hdr);
3517msg_cancel:
3518 return -EMSGSIZE;
3519}
3520
3521int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3522 int (*skb_handler)(struct sk_buff *skb,
3523 struct netlink_callback *cb,
3524 struct tipc_sock *tsk))
3525{
3526 struct rhashtable_iter *iter = (void *)cb->args[4];
3527 struct tipc_sock *tsk;
3528 int err;
3529
3530 rhashtable_walk_start(iter);
3531 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3532 if (IS_ERR(tsk)) {
3533 err = PTR_ERR(tsk);
3534 if (err == -EAGAIN) {
3535 err = 0;
3536 continue;
3537 }
3538 break;
3539 }
3540
3541 sock_hold(&tsk->sk);
3542 rhashtable_walk_stop(iter);
3543 lock_sock(&tsk->sk);
3544 err = skb_handler(skb, cb, tsk);
3545 if (err) {
3546 release_sock(&tsk->sk);
3547 sock_put(&tsk->sk);
3548 goto out;
3549 }
3550 release_sock(&tsk->sk);
3551 rhashtable_walk_start(iter);
3552 sock_put(&tsk->sk);
3553 }
3554 rhashtable_walk_stop(iter);
3555out:
3556 return skb->len;
3557}
3558EXPORT_SYMBOL(tipc_nl_sk_walk);
3559
3560int tipc_dump_start(struct netlink_callback *cb)
3561{
3562 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3563}
3564EXPORT_SYMBOL(tipc_dump_start);
3565
3566int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3567{
3568 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3569 struct rhashtable_iter *iter = (void *)cb->args[4];
3570 struct tipc_net *tn = tipc_net(net);
3571
3572 if (!iter) {
3573 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3574 if (!iter)
3575 return -ENOMEM;
3576
3577 cb->args[4] = (long)iter;
3578 }
3579
3580 rhashtable_walk_enter(&tn->sk_rht, iter);
3581 return 0;
3582}
3583
3584int tipc_dump_done(struct netlink_callback *cb)
3585{
3586 struct rhashtable_iter *hti = (void *)cb->args[4];
3587
3588 rhashtable_walk_exit(hti);
3589 kfree(hti);
3590 return 0;
3591}
3592EXPORT_SYMBOL(tipc_dump_done);
3593
3594int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3595 struct tipc_sock *tsk, u32 sk_filter_state,
3596 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3597{
3598 struct sock *sk = &tsk->sk;
3599 struct nlattr *attrs;
3600 struct nlattr *stat;
3601
3602 /*filter response w.r.t sk_state*/
3603 if (!(sk_filter_state & (1 << sk->sk_state)))
3604 return 0;
3605
3606 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3607 if (!attrs)
3608 goto msg_cancel;
3609
3610 if (__tipc_nl_add_sk_info(skb, tsk))
3611 goto attr_msg_cancel;
3612
3613 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3614 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3615 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3616 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3617 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3618 sock_i_uid(sk))) ||
3619 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3620 tipc_diag_gen_cookie(sk),
3621 TIPC_NLA_SOCK_PAD))
3622 goto attr_msg_cancel;
3623
3624 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3625 if (!stat)
3626 goto attr_msg_cancel;
3627
3628 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3629 skb_queue_len(&sk->sk_receive_queue)) ||
3630 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3631 skb_queue_len(&sk->sk_write_queue)) ||
3632 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3633 atomic_read(&sk->sk_drops)))
3634 goto stat_msg_cancel;
3635
3636 if (tsk->cong_link_cnt &&
3637 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3638 goto stat_msg_cancel;
3639
3640 if (tsk_conn_cong(tsk) &&
3641 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3642 goto stat_msg_cancel;
3643
3644 nla_nest_end(skb, stat);
3645
3646 if (tsk->group)
3647 if (tipc_group_fill_sock_diag(tsk->group, skb))
3648 goto stat_msg_cancel;
3649
3650 nla_nest_end(skb, attrs);
3651
3652 return 0;
3653
3654stat_msg_cancel:
3655 nla_nest_cancel(skb, stat);
3656attr_msg_cancel:
3657 nla_nest_cancel(skb, attrs);
3658msg_cancel:
3659 return -EMSGSIZE;
3660}
3661EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3662
3663int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3664{
3665 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3666}
3667
3668/* Caller should hold socket lock for the passed tipc socket. */
3669static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3670 struct netlink_callback *cb,
3671 struct publication *publ)
3672{
3673 void *hdr;
3674 struct nlattr *attrs;
3675
3676 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3677 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3678 if (!hdr)
3679 goto msg_cancel;
3680
3681 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3682 if (!attrs)
3683 goto genlmsg_cancel;
3684
3685 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3686 goto attr_msg_cancel;
3687 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
3688 goto attr_msg_cancel;
3689 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
3690 goto attr_msg_cancel;
3691 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
3692 goto attr_msg_cancel;
3693
3694 nla_nest_end(skb, attrs);
3695 genlmsg_end(skb, hdr);
3696
3697 return 0;
3698
3699attr_msg_cancel:
3700 nla_nest_cancel(skb, attrs);
3701genlmsg_cancel:
3702 genlmsg_cancel(skb, hdr);
3703msg_cancel:
3704 return -EMSGSIZE;
3705}
3706
3707/* Caller should hold socket lock for the passed tipc socket. */
3708static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3709 struct netlink_callback *cb,
3710 struct tipc_sock *tsk, u32 *last_publ)
3711{
3712 int err;
3713 struct publication *p;
3714
3715 if (*last_publ) {
3716 list_for_each_entry(p, &tsk->publications, binding_sock) {
3717 if (p->key == *last_publ)
3718 break;
3719 }
3720 if (p->key != *last_publ) {
3721 /* We never set seq or call nl_dump_check_consistent()
3722 * this means that setting prev_seq here will cause the
3723 * consistence check to fail in the netlink callback
3724 * handler. Resulting in the last NLMSG_DONE message
3725 * having the NLM_F_DUMP_INTR flag set.
3726 */
3727 cb->prev_seq = 1;
3728 *last_publ = 0;
3729 return -EPIPE;
3730 }
3731 } else {
3732 p = list_first_entry(&tsk->publications, struct publication,
3733 binding_sock);
3734 }
3735
3736 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3737 err = __tipc_nl_add_sk_publ(skb, cb, p);
3738 if (err) {
3739 *last_publ = p->key;
3740 return err;
3741 }
3742 }
3743 *last_publ = 0;
3744
3745 return 0;
3746}
3747
3748int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3749{
3750 int err;
3751 u32 tsk_portid = cb->args[0];
3752 u32 last_publ = cb->args[1];
3753 u32 done = cb->args[2];
3754 struct net *net = sock_net(skb->sk);
3755 struct tipc_sock *tsk;
3756
3757 if (!tsk_portid) {
3758 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
3759 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3760
3761 if (!attrs[TIPC_NLA_SOCK])
3762 return -EINVAL;
3763
3764 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3765 attrs[TIPC_NLA_SOCK],
3766 tipc_nl_sock_policy, NULL);
3767 if (err)
3768 return err;
3769
3770 if (!sock[TIPC_NLA_SOCK_REF])
3771 return -EINVAL;
3772
3773 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3774 }
3775
3776 if (done)
3777 return 0;
3778
3779 tsk = tipc_sk_lookup(net, tsk_portid);
3780 if (!tsk)
3781 return -EINVAL;
3782
3783 lock_sock(&tsk->sk);
3784 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3785 if (!err)
3786 done = 1;
3787 release_sock(&tsk->sk);
3788 sock_put(&tsk->sk);
3789
3790 cb->args[0] = tsk_portid;
3791 cb->args[1] = last_publ;
3792 cb->args[2] = done;
3793
3794 return skb->len;
3795}
3796
3797/**
3798 * tipc_sk_filtering - check if a socket should be traced
3799 * @sk: the socket to be examined
3800 * @sysctl_tipc_sk_filter[]: the socket tuple for filtering,
3801 * (portid, sock type, name type, name lower, name upper)
3802 *
3803 * Returns true if the socket meets the socket tuple data
3804 * (value 0 = 'any') or when there is no tuple set (all = 0),
3805 * otherwise false
3806 */
3807bool tipc_sk_filtering(struct sock *sk)
3808{
3809 struct tipc_sock *tsk;
3810 struct publication *p;
3811 u32 _port, _sktype, _type, _lower, _upper;
3812 u32 type = 0, lower = 0, upper = 0;
3813
3814 if (!sk)
3815 return true;
3816
3817 tsk = tipc_sk(sk);
3818
3819 _port = sysctl_tipc_sk_filter[0];
3820 _sktype = sysctl_tipc_sk_filter[1];
3821 _type = sysctl_tipc_sk_filter[2];
3822 _lower = sysctl_tipc_sk_filter[3];
3823 _upper = sysctl_tipc_sk_filter[4];
3824
3825 if (!_port && !_sktype && !_type && !_lower && !_upper)
3826 return true;
3827
3828 if (_port)
3829 return (_port == tsk->portid);
3830
3831 if (_sktype && _sktype != sk->sk_type)
3832 return false;
3833
3834 if (tsk->published) {
3835 p = list_first_entry_or_null(&tsk->publications,
3836 struct publication, binding_sock);
3837 if (p) {
3838 type = p->type;
3839 lower = p->lower;
3840 upper = p->upper;
3841 }
3842 }
3843
3844 if (!tipc_sk_type_connectionless(sk)) {
3845 type = tsk->conn_type;
3846 lower = tsk->conn_instance;
3847 upper = tsk->conn_instance;
3848 }
3849
3850 if ((_type && _type != type) || (_lower && _lower != lower) ||
3851 (_upper && _upper != upper))
3852 return false;
3853
3854 return true;
3855}
3856
3857u32 tipc_sock_get_portid(struct sock *sk)
3858{
3859 return (sk) ? (tipc_sk(sk))->portid : 0;
3860}
3861
3862/**
3863 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3864 * both the rcv and backlog queues are considered
3865 * @sk: tipc sk to be checked
3866 * @skb: tipc msg to be checked
3867 *
3868 * Returns true if the socket rx queue allocation is > 90%, otherwise false
3869 */
3870
3871bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3872{
3873 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3874 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3875 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3876
3877 return (qsize > lim * 90 / 100);
3878}
3879
3880/**
3881 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3882 * only the rcv queue is considered
3883 * @sk: tipc sk to be checked
3884 * @skb: tipc msg to be checked
3885 *
3886 * Returns true if the socket rx queue allocation is > 90%, otherwise false
3887 */
3888
3889bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3890{
3891 unsigned int lim = rcvbuf_limit(sk, skb);
3892 unsigned int qsize = sk_rmem_alloc_get(sk);
3893
3894 return (qsize > lim * 90 / 100);
3895}
3896
3897/**
3898 * tipc_sk_dump - dump TIPC socket
3899 * @sk: tipc sk to be dumped
3900 * @dqueues: bitmask to decide if any socket queue to be dumped?
3901 * - TIPC_DUMP_NONE: don't dump socket queues
3902 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3903 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3904 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3905 * - TIPC_DUMP_ALL: dump all the socket queues above
3906 * @buf: returned buffer of dump data in format
3907 */
3908int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3909{
3910 int i = 0;
3911 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3912 struct tipc_sock *tsk;
3913 struct publication *p;
3914 bool tsk_connected;
3915
3916 if (!sk) {
3917 i += scnprintf(buf, sz, "sk data: (null)\n");
3918 return i;
3919 }
3920
3921 tsk = tipc_sk(sk);
3922 tsk_connected = !tipc_sk_type_connectionless(sk);
3923
3924 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3925 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3926 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3927 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3928 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3929 if (tsk_connected) {
3930 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3931 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3932 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type);
3933 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance);
3934 }
3935 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3936 if (tsk->published) {
3937 p = list_first_entry_or_null(&tsk->publications,
3938 struct publication, binding_sock);
3939 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0);
3940 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0);
3941 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0);
3942 }
3943 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3944 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3945 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3946 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3947 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3948 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3949 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3950 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3951 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3952 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3953 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3954 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3955 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3956 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3957
3958 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3959 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3960 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3961 }
3962
3963 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3964 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3965 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
3966 }
3967
3968 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
3969 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
3970 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
3971 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
3972 i += scnprintf(buf + i, sz - i, " tail ");
3973 i += tipc_skb_dump(sk->sk_backlog.tail, false,
3974 buf + i);
3975 }
3976 }
3977
3978 return i;
3979}