2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012 Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
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.
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.
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
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33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
40 #include <linux/export.h>
43 #define SS_LISTENING -1 /* socket is listening */
44 #define SS_READY -2 /* socket is connectionless */
46 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
51 struct tipc_portid peer_name;
52 unsigned int conn_timeout;
55 #define tipc_sk(sk) ((struct tipc_sock *)(sk))
56 #define tipc_sk_port(sk) (tipc_sk(sk)->p)
58 #define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
59 (sock->state == SS_DISCONNECTING))
61 static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
62 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
63 static void wakeupdispatch(struct tipc_port *tport);
64 static void tipc_data_ready(struct sock *sk, int len);
65 static void tipc_write_space(struct sock *sk);
66 static int release(struct socket *sock);
67 static int accept(struct socket *sock, struct socket *new_sock, int flags);
69 static const struct proto_ops packet_ops;
70 static const struct proto_ops stream_ops;
71 static const struct proto_ops msg_ops;
73 static struct proto tipc_proto;
74 static struct proto tipc_proto_kern;
76 static int sockets_enabled;
79 * Revised TIPC socket locking policy:
81 * Most socket operations take the standard socket lock when they start
82 * and hold it until they finish (or until they need to sleep). Acquiring
83 * this lock grants the owner exclusive access to the fields of the socket
84 * data structures, with the exception of the backlog queue. A few socket
85 * operations can be done without taking the socket lock because they only
86 * read socket information that never changes during the life of the socket.
88 * Socket operations may acquire the lock for the associated TIPC port if they
89 * need to perform an operation on the port. If any routine needs to acquire
90 * both the socket lock and the port lock it must take the socket lock first
91 * to avoid the risk of deadlock.
93 * The dispatcher handling incoming messages cannot grab the socket lock in
94 * the standard fashion, since invoked it runs at the BH level and cannot block.
95 * Instead, it checks to see if the socket lock is currently owned by someone,
96 * and either handles the message itself or adds it to the socket's backlog
97 * queue; in the latter case the queued message is processed once the process
98 * owning the socket lock releases it.
100 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
101 * the problem of a blocked socket operation preventing any other operations
102 * from occurring. However, applications must be careful if they have
103 * multiple threads trying to send (or receive) on the same socket, as these
104 * operations might interfere with each other. For example, doing a connect
105 * and a receive at the same time might allow the receive to consume the
106 * ACK message meant for the connect. While additional work could be done
107 * to try and overcome this, it doesn't seem to be worthwhile at the present.
109 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
110 * that another operation that must be performed in a non-blocking manner is
111 * not delayed for very long because the lock has already been taken.
113 * NOTE: This code assumes that certain fields of a port/socket pair are
114 * constant over its lifetime; such fields can be examined without taking
115 * the socket lock and/or port lock, and do not need to be re-read even
116 * after resuming processing after waiting. These fields include:
118 * - pointer to socket sk structure (aka tipc_sock structure)
119 * - pointer to port structure
124 * advance_rx_queue - discard first buffer in socket receive queue
126 * Caller must hold socket lock
128 static void advance_rx_queue(struct sock *sk)
130 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
134 * reject_rx_queue - reject all buffers in socket receive queue
136 * Caller must hold socket lock
138 static void reject_rx_queue(struct sock *sk)
142 while ((buf = __skb_dequeue(&sk->sk_receive_queue)))
143 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
147 * tipc_sk_create - create a TIPC socket
148 * @net: network namespace (must be default network)
149 * @sock: pre-allocated socket structure
150 * @protocol: protocol indicator (must be 0)
151 * @kern: caused by kernel or by userspace?
153 * This routine creates additional data structures used by the TIPC socket,
154 * initializes them, and links them together.
156 * Returns 0 on success, errno otherwise
158 static int tipc_sk_create(struct net *net, struct socket *sock, int protocol,
161 const struct proto_ops *ops;
164 struct tipc_port *tp_ptr;
166 /* Validate arguments */
167 if (unlikely(protocol != 0))
168 return -EPROTONOSUPPORT;
170 switch (sock->type) {
173 state = SS_UNCONNECTED;
177 state = SS_UNCONNECTED;
188 /* Allocate socket's protocol area */
190 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
192 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
197 /* Allocate TIPC port for socket to use */
198 tp_ptr = tipc_createport(sk, &dispatch, &wakeupdispatch,
199 TIPC_LOW_IMPORTANCE);
200 if (unlikely(!tp_ptr)) {
205 /* Finish initializing socket data structures */
209 sock_init_data(sock, sk);
210 sk->sk_backlog_rcv = backlog_rcv;
211 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
212 sk->sk_data_ready = tipc_data_ready;
213 sk->sk_write_space = tipc_write_space;
214 tipc_sk(sk)->p = tp_ptr;
215 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
217 spin_unlock_bh(tp_ptr->lock);
219 if (sock->state == SS_READY) {
220 tipc_set_portunreturnable(tp_ptr->ref, 1);
221 if (sock->type == SOCK_DGRAM)
222 tipc_set_portunreliable(tp_ptr->ref, 1);
229 * tipc_sock_create_local - create TIPC socket from inside TIPC module
230 * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
232 * We cannot use sock_creat_kern here because it bumps module user count.
233 * Since socket owner and creator is the same module we must make sure
234 * that module count remains zero for module local sockets, otherwise
235 * we cannot do rmmod.
237 * Returns 0 on success, errno otherwise
239 int tipc_sock_create_local(int type, struct socket **res)
244 rc = sock_create_lite(AF_TIPC, type, 0, res);
246 pr_err("Failed to create kernel socket\n");
249 tipc_sk_create(&init_net, *res, 0, 1);
257 * tipc_sock_release_local - release socket created by tipc_sock_create_local
258 * @sock: the socket to be released.
260 * Module reference count is not incremented when such sockets are created,
261 * so we must keep it from being decremented when they are released.
263 void tipc_sock_release_local(struct socket *sock)
271 * tipc_sock_accept_local - accept a connection on a socket created
272 * with tipc_sock_create_local. Use this function to avoid that
273 * module reference count is inadvertently incremented.
275 * @sock: the accepting socket
276 * @newsock: reference to the new socket to be created
277 * @flags: socket flags
280 int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
283 struct sock *sk = sock->sk;
286 ret = sock_create_lite(sk->sk_family, sk->sk_type,
287 sk->sk_protocol, newsock);
291 ret = accept(sock, *newsock, flags);
293 sock_release(*newsock);
296 (*newsock)->ops = sock->ops;
301 * release - destroy a TIPC socket
302 * @sock: socket to destroy
304 * This routine cleans up any messages that are still queued on the socket.
305 * For DGRAM and RDM socket types, all queued messages are rejected.
306 * For SEQPACKET and STREAM socket types, the first message is rejected
307 * and any others are discarded. (If the first message on a STREAM socket
308 * is partially-read, it is discarded and the next one is rejected instead.)
310 * NOTE: Rejected messages are not necessarily returned to the sender! They
311 * are returned or discarded according to the "destination droppable" setting
312 * specified for the message by the sender.
314 * Returns 0 on success, errno otherwise
316 static int release(struct socket *sock)
318 struct sock *sk = sock->sk;
319 struct tipc_port *tport;
324 * Exit if socket isn't fully initialized (occurs when a failed accept()
325 * releases a pre-allocated child socket that was never used)
330 tport = tipc_sk_port(sk);
334 * Reject all unreceived messages, except on an active connection
335 * (which disconnects locally & sends a 'FIN+' to peer)
337 while (sock->state != SS_DISCONNECTING) {
338 buf = __skb_dequeue(&sk->sk_receive_queue);
341 if (TIPC_SKB_CB(buf)->handle != NULL)
344 if ((sock->state == SS_CONNECTING) ||
345 (sock->state == SS_CONNECTED)) {
346 sock->state = SS_DISCONNECTING;
347 tipc_disconnect(tport->ref);
349 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
354 * Delete TIPC port; this ensures no more messages are queued
355 * (also disconnects an active connection & sends a 'FIN-' to peer)
357 res = tipc_deleteport(tport);
359 /* Discard any remaining (connection-based) messages in receive queue */
360 __skb_queue_purge(&sk->sk_receive_queue);
362 /* Reject any messages that accumulated in backlog queue */
363 sock->state = SS_DISCONNECTING;
373 * bind - associate or disassocate TIPC name(s) with a socket
374 * @sock: socket structure
375 * @uaddr: socket address describing name(s) and desired operation
376 * @uaddr_len: size of socket address data structure
378 * Name and name sequence binding is indicated using a positive scope value;
379 * a negative scope value unbinds the specified name. Specifying no name
380 * (i.e. a socket address length of 0) unbinds all names from the socket.
382 * Returns 0 on success, errno otherwise
384 * NOTE: This routine doesn't need to take the socket lock since it doesn't
385 * access any non-constant socket information.
387 static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
389 struct sock *sk = sock->sk;
390 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
391 struct tipc_port *tport = tipc_sk_port(sock->sk);
395 if (unlikely(!uaddr_len)) {
396 res = tipc_withdraw(tport, 0, NULL);
400 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
404 if (addr->family != AF_TIPC) {
409 if (addr->addrtype == TIPC_ADDR_NAME)
410 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
411 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
416 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
417 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
418 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
423 res = (addr->scope > 0) ?
424 tipc_publish(tport, addr->scope, &addr->addr.nameseq) :
425 tipc_withdraw(tport, -addr->scope, &addr->addr.nameseq);
432 * get_name - get port ID of socket or peer socket
433 * @sock: socket structure
434 * @uaddr: area for returned socket address
435 * @uaddr_len: area for returned length of socket address
436 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
438 * Returns 0 on success, errno otherwise
440 * NOTE: This routine doesn't need to take the socket lock since it only
441 * accesses socket information that is unchanging (or which changes in
442 * a completely predictable manner).
444 static int get_name(struct socket *sock, struct sockaddr *uaddr,
445 int *uaddr_len, int peer)
447 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
448 struct tipc_sock *tsock = tipc_sk(sock->sk);
450 memset(addr, 0, sizeof(*addr));
452 if ((sock->state != SS_CONNECTED) &&
453 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
455 addr->addr.id.ref = tsock->peer_name.ref;
456 addr->addr.id.node = tsock->peer_name.node;
458 addr->addr.id.ref = tsock->p->ref;
459 addr->addr.id.node = tipc_own_addr;
462 *uaddr_len = sizeof(*addr);
463 addr->addrtype = TIPC_ADDR_ID;
464 addr->family = AF_TIPC;
466 addr->addr.name.domain = 0;
472 * poll - read and possibly block on pollmask
473 * @file: file structure associated with the socket
474 * @sock: socket for which to calculate the poll bits
477 * Returns pollmask value
480 * It appears that the usual socket locking mechanisms are not useful here
481 * since the pollmask info is potentially out-of-date the moment this routine
482 * exits. TCP and other protocols seem to rely on higher level poll routines
483 * to handle any preventable race conditions, so TIPC will do the same ...
485 * TIPC sets the returned events as follows:
487 * socket state flags set
488 * ------------ ---------
489 * unconnected no read flags
490 * POLLOUT if port is not congested
492 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
495 * connected POLLIN/POLLRDNORM if data in rx queue
496 * POLLOUT if port is not congested
498 * disconnecting POLLIN/POLLRDNORM/POLLHUP
501 * listening POLLIN if SYN in rx queue
504 * ready POLLIN/POLLRDNORM if data in rx queue
505 * [connectionless] POLLOUT (since port cannot be congested)
507 * IMPORTANT: The fact that a read or write operation is indicated does NOT
508 * imply that the operation will succeed, merely that it should be performed
509 * and will not block.
511 static unsigned int poll(struct file *file, struct socket *sock,
514 struct sock *sk = sock->sk;
517 sock_poll_wait(file, sk_sleep(sk), wait);
519 switch ((int)sock->state) {
521 if (!tipc_sk_port(sk)->congested)
526 if (!tipc_sk_port(sk)->congested)
531 if (!skb_queue_empty(&sk->sk_receive_queue))
532 mask |= (POLLIN | POLLRDNORM);
534 case SS_DISCONNECTING:
535 mask = (POLLIN | POLLRDNORM | POLLHUP);
543 * dest_name_check - verify user is permitted to send to specified port name
544 * @dest: destination address
545 * @m: descriptor for message to be sent
547 * Prevents restricted configuration commands from being issued by
548 * unauthorized users.
550 * Returns 0 if permission is granted, otherwise errno
552 static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
554 struct tipc_cfg_msg_hdr hdr;
556 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
558 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
560 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
563 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
565 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
567 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
574 * send_msg - send message in connectionless manner
575 * @iocb: if NULL, indicates that socket lock is already held
576 * @sock: socket structure
577 * @m: message to send
578 * @total_len: length of message
580 * Message must have an destination specified explicitly.
581 * Used for SOCK_RDM and SOCK_DGRAM messages,
582 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
583 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
585 * Returns the number of bytes sent on success, or errno otherwise
587 static int send_msg(struct kiocb *iocb, struct socket *sock,
588 struct msghdr *m, size_t total_len)
590 struct sock *sk = sock->sk;
591 struct tipc_port *tport = tipc_sk_port(sk);
592 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
598 return -EDESTADDRREQ;
599 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
600 (dest->family != AF_TIPC)))
602 if (total_len > TIPC_MAX_USER_MSG_SIZE)
608 needs_conn = (sock->state != SS_READY);
609 if (unlikely(needs_conn)) {
610 if (sock->state == SS_LISTENING) {
614 if (sock->state != SS_UNCONNECTED) {
618 if (tport->published) {
622 if (dest->addrtype == TIPC_ADDR_NAME) {
623 tport->conn_type = dest->addr.name.name.type;
624 tport->conn_instance = dest->addr.name.name.instance;
627 /* Abort any pending connection attempts (very unlikely) */
631 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
634 if (dest->addrtype == TIPC_ADDR_NAME) {
635 res = dest_name_check(dest, m);
638 res = tipc_send2name(tport->ref,
639 &dest->addr.name.name,
640 dest->addr.name.domain,
643 } else if (dest->addrtype == TIPC_ADDR_ID) {
644 res = tipc_send2port(tport->ref,
648 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
653 res = dest_name_check(dest, m);
656 res = tipc_multicast(tport->ref,
661 if (likely(res != -ELINKCONG)) {
662 if (needs_conn && (res >= 0))
663 sock->state = SS_CONNECTING;
666 if (timeout_val <= 0L) {
667 res = timeout_val ? timeout_val : -EWOULDBLOCK;
671 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
672 !tport->congested, timeout_val);
683 * send_packet - send a connection-oriented message
684 * @iocb: if NULL, indicates that socket lock is already held
685 * @sock: socket structure
686 * @m: message to send
687 * @total_len: length of message
689 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
691 * Returns the number of bytes sent on success, or errno otherwise
693 static int send_packet(struct kiocb *iocb, struct socket *sock,
694 struct msghdr *m, size_t total_len)
696 struct sock *sk = sock->sk;
697 struct tipc_port *tport = tipc_sk_port(sk);
698 struct sockaddr_tipc *dest = (struct sockaddr_tipc *)m->msg_name;
702 /* Handle implied connection establishment */
704 return send_msg(iocb, sock, m, total_len);
706 if (total_len > TIPC_MAX_USER_MSG_SIZE)
712 timeout_val = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
715 if (unlikely(sock->state != SS_CONNECTED)) {
716 if (sock->state == SS_DISCONNECTING)
723 res = tipc_send(tport->ref, m->msg_iov, total_len);
724 if (likely(res != -ELINKCONG))
726 if (timeout_val <= 0L) {
727 res = timeout_val ? timeout_val : -EWOULDBLOCK;
731 timeout_val = wait_event_interruptible_timeout(*sk_sleep(sk),
732 (!tport->congested || !tport->connected), timeout_val);
742 * send_stream - send stream-oriented data
744 * @sock: socket structure
746 * @total_len: total length of data to be sent
748 * Used for SOCK_STREAM data.
750 * Returns the number of bytes sent on success (or partial success),
751 * or errno if no data sent
753 static int send_stream(struct kiocb *iocb, struct socket *sock,
754 struct msghdr *m, size_t total_len)
756 struct sock *sk = sock->sk;
757 struct tipc_port *tport = tipc_sk_port(sk);
758 struct msghdr my_msg;
760 struct iovec *curr_iov;
762 char __user *curr_start;
771 /* Handle special cases where there is no connection */
772 if (unlikely(sock->state != SS_CONNECTED)) {
773 if (sock->state == SS_UNCONNECTED) {
774 res = send_packet(NULL, sock, m, total_len);
776 } else if (sock->state == SS_DISCONNECTING) {
785 if (unlikely(m->msg_name)) {
790 if (total_len > (unsigned int)INT_MAX) {
796 * Send each iovec entry using one or more messages
798 * Note: This algorithm is good for the most likely case
799 * (i.e. one large iovec entry), but could be improved to pass sets
800 * of small iovec entries into send_packet().
802 curr_iov = m->msg_iov;
803 curr_iovlen = m->msg_iovlen;
804 my_msg.msg_iov = &my_iov;
805 my_msg.msg_iovlen = 1;
806 my_msg.msg_flags = m->msg_flags;
807 my_msg.msg_name = NULL;
810 hdr_size = msg_hdr_sz(&tport->phdr);
812 while (curr_iovlen--) {
813 curr_start = curr_iov->iov_base;
814 curr_left = curr_iov->iov_len;
817 bytes_to_send = tport->max_pkt - hdr_size;
818 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
819 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
820 if (curr_left < bytes_to_send)
821 bytes_to_send = curr_left;
822 my_iov.iov_base = curr_start;
823 my_iov.iov_len = bytes_to_send;
824 res = send_packet(NULL, sock, &my_msg, bytes_to_send);
830 curr_left -= bytes_to_send;
831 curr_start += bytes_to_send;
832 bytes_sent += bytes_to_send;
844 * auto_connect - complete connection setup to a remote port
845 * @sock: socket structure
846 * @msg: peer's response message
848 * Returns 0 on success, errno otherwise
850 static int auto_connect(struct socket *sock, struct tipc_msg *msg)
852 struct tipc_sock *tsock = tipc_sk(sock->sk);
853 struct tipc_port *p_ptr;
855 tsock->peer_name.ref = msg_origport(msg);
856 tsock->peer_name.node = msg_orignode(msg);
857 p_ptr = tipc_port_deref(tsock->p->ref);
861 __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name);
863 if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
865 msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg));
866 sock->state = SS_CONNECTED;
871 * set_orig_addr - capture sender's address for received message
872 * @m: descriptor for message info
873 * @msg: received message header
875 * Note: Address is not captured if not requested by receiver.
877 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
879 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)m->msg_name;
882 addr->family = AF_TIPC;
883 addr->addrtype = TIPC_ADDR_ID;
884 memset(&addr->addr, 0, sizeof(addr->addr));
885 addr->addr.id.ref = msg_origport(msg);
886 addr->addr.id.node = msg_orignode(msg);
887 addr->addr.name.domain = 0; /* could leave uninitialized */
888 addr->scope = 0; /* could leave uninitialized */
889 m->msg_namelen = sizeof(struct sockaddr_tipc);
894 * anc_data_recv - optionally capture ancillary data for received message
895 * @m: descriptor for message info
896 * @msg: received message header
897 * @tport: TIPC port associated with message
899 * Note: Ancillary data is not captured if not requested by receiver.
901 * Returns 0 if successful, otherwise errno
903 static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
904 struct tipc_port *tport)
912 if (likely(m->msg_controllen == 0))
915 /* Optionally capture errored message object(s) */
916 err = msg ? msg_errcode(msg) : 0;
919 anc_data[1] = msg_data_sz(msg);
920 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
924 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
931 /* Optionally capture message destination object */
932 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
936 anc_data[0] = msg_nametype(msg);
937 anc_data[1] = msg_namelower(msg);
938 anc_data[2] = msg_namelower(msg);
942 anc_data[0] = msg_nametype(msg);
943 anc_data[1] = msg_namelower(msg);
944 anc_data[2] = msg_nameupper(msg);
947 has_name = (tport->conn_type != 0);
948 anc_data[0] = tport->conn_type;
949 anc_data[1] = tport->conn_instance;
950 anc_data[2] = tport->conn_instance;
956 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
965 * recv_msg - receive packet-oriented message
967 * @m: descriptor for message info
968 * @buf_len: total size of user buffer area
969 * @flags: receive flags
971 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
972 * If the complete message doesn't fit in user area, truncate it.
974 * Returns size of returned message data, errno otherwise
976 static int recv_msg(struct kiocb *iocb, struct socket *sock,
977 struct msghdr *m, size_t buf_len, int flags)
979 struct sock *sk = sock->sk;
980 struct tipc_port *tport = tipc_sk_port(sk);
982 struct tipc_msg *msg;
988 /* Catch invalid receive requests */
989 if (unlikely(!buf_len))
994 if (unlikely(sock->state == SS_UNCONNECTED)) {
999 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1002 /* Look for a message in receive queue; wait if necessary */
1003 while (skb_queue_empty(&sk->sk_receive_queue)) {
1004 if (sock->state == SS_DISCONNECTING) {
1008 if (timeout <= 0L) {
1009 res = timeout ? timeout : -EWOULDBLOCK;
1013 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
1014 tipc_rx_ready(sock),
1019 /* Look at first message in receive queue */
1020 buf = skb_peek(&sk->sk_receive_queue);
1022 sz = msg_data_sz(msg);
1023 err = msg_errcode(msg);
1025 /* Discard an empty non-errored message & try again */
1026 if ((!sz) && (!err)) {
1027 advance_rx_queue(sk);
1031 /* Capture sender's address (optional) */
1032 set_orig_addr(m, msg);
1034 /* Capture ancillary data (optional) */
1035 res = anc_data_recv(m, msg, tport);
1039 /* Capture message data (if valid) & compute return value (always) */
1041 if (unlikely(buf_len < sz)) {
1043 m->msg_flags |= MSG_TRUNC;
1045 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
1051 if ((sock->state == SS_READY) ||
1052 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1058 /* Consume received message (optional) */
1059 if (likely(!(flags & MSG_PEEK))) {
1060 if ((sock->state != SS_READY) &&
1061 (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1062 tipc_acknowledge(tport->ref, tport->conn_unacked);
1063 advance_rx_queue(sk);
1071 * recv_stream - receive stream-oriented data
1073 * @m: descriptor for message info
1074 * @buf_len: total size of user buffer area
1075 * @flags: receive flags
1077 * Used for SOCK_STREAM messages only. If not enough data is available
1078 * will optionally wait for more; never truncates data.
1080 * Returns size of returned message data, errno otherwise
1082 static int recv_stream(struct kiocb *iocb, struct socket *sock,
1083 struct msghdr *m, size_t buf_len, int flags)
1085 struct sock *sk = sock->sk;
1086 struct tipc_port *tport = tipc_sk_port(sk);
1087 struct sk_buff *buf;
1088 struct tipc_msg *msg;
1091 int sz_to_copy, target, needed;
1096 /* Catch invalid receive attempts */
1097 if (unlikely(!buf_len))
1102 if (unlikely((sock->state == SS_UNCONNECTED))) {
1107 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1108 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1111 /* Look for a message in receive queue; wait if necessary */
1112 while (skb_queue_empty(&sk->sk_receive_queue)) {
1113 if (sock->state == SS_DISCONNECTING) {
1117 if (timeout <= 0L) {
1118 res = timeout ? timeout : -EWOULDBLOCK;
1122 timeout = wait_event_interruptible_timeout(*sk_sleep(sk),
1123 tipc_rx_ready(sock),
1128 /* Look at first message in receive queue */
1129 buf = skb_peek(&sk->sk_receive_queue);
1131 sz = msg_data_sz(msg);
1132 err = msg_errcode(msg);
1134 /* Discard an empty non-errored message & try again */
1135 if ((!sz) && (!err)) {
1136 advance_rx_queue(sk);
1140 /* Optionally capture sender's address & ancillary data of first msg */
1141 if (sz_copied == 0) {
1142 set_orig_addr(m, msg);
1143 res = anc_data_recv(m, msg, tport);
1148 /* Capture message data (if valid) & compute return value (always) */
1150 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1153 needed = (buf_len - sz_copied);
1154 sz_to_copy = (sz <= needed) ? sz : needed;
1156 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1157 m->msg_iov, sz_to_copy);
1161 sz_copied += sz_to_copy;
1163 if (sz_to_copy < sz) {
1164 if (!(flags & MSG_PEEK))
1165 TIPC_SKB_CB(buf)->handle =
1166 (void *)(unsigned long)(offset + sz_to_copy);
1171 goto exit; /* can't add error msg to valid data */
1173 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1179 /* Consume received message (optional) */
1180 if (likely(!(flags & MSG_PEEK))) {
1181 if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1182 tipc_acknowledge(tport->ref, tport->conn_unacked);
1183 advance_rx_queue(sk);
1186 /* Loop around if more data is required */
1187 if ((sz_copied < buf_len) && /* didn't get all requested data */
1188 (!skb_queue_empty(&sk->sk_receive_queue) ||
1189 (sz_copied < target)) && /* and more is ready or required */
1190 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1191 (!err)) /* and haven't reached a FIN */
1196 return sz_copied ? sz_copied : res;
1200 * tipc_write_space - wake up thread if port congestion is released
1203 static void tipc_write_space(struct sock *sk)
1205 struct socket_wq *wq;
1208 wq = rcu_dereference(sk->sk_wq);
1209 if (wq_has_sleeper(wq))
1210 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1211 POLLWRNORM | POLLWRBAND);
1216 * tipc_data_ready - wake up threads to indicate messages have been received
1218 * @len: the length of messages
1220 static void tipc_data_ready(struct sock *sk, int len)
1222 struct socket_wq *wq;
1225 wq = rcu_dereference(sk->sk_wq);
1226 if (wq_has_sleeper(wq))
1227 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1228 POLLRDNORM | POLLRDBAND);
1233 * filter_connect - Handle all incoming messages for a connection-based socket
1234 * @tsock: TIPC socket
1237 * Returns TIPC error status code and socket error status code
1238 * once it encounters some errors
1240 static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf)
1242 struct socket *sock = tsock->sk.sk_socket;
1243 struct tipc_msg *msg = buf_msg(*buf);
1244 struct sock *sk = &tsock->sk;
1245 u32 retval = TIPC_ERR_NO_PORT;
1251 switch ((int)sock->state) {
1253 /* Accept only connection-based messages sent by peer */
1254 if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) {
1255 if (unlikely(msg_errcode(msg))) {
1256 sock->state = SS_DISCONNECTING;
1257 __tipc_disconnect(tsock->p);
1263 /* Accept only ACK or NACK message */
1264 if (unlikely(msg_errcode(msg))) {
1265 sock->state = SS_DISCONNECTING;
1266 sk->sk_err = ECONNREFUSED;
1271 if (unlikely(!msg_connected(msg)))
1274 res = auto_connect(sock, msg);
1276 sock->state = SS_DISCONNECTING;
1282 /* If an incoming message is an 'ACK-', it should be
1283 * discarded here because it doesn't contain useful
1284 * data. In addition, we should try to wake up
1285 * connect() routine if sleeping.
1287 if (msg_data_sz(msg) == 0) {
1290 if (waitqueue_active(sk_sleep(sk)))
1291 wake_up_interruptible(sk_sleep(sk));
1296 case SS_UNCONNECTED:
1297 /* Accept only SYN message */
1298 if (!msg_connected(msg) && !(msg_errcode(msg)))
1301 case SS_DISCONNECTING:
1304 pr_err("Unknown socket state %u\n", sock->state);
1310 * rcvbuf_limit - get proper overload limit of socket receive queue
1314 * For all connection oriented messages, irrespective of importance,
1315 * the default overload value (i.e. 67MB) is set as limit.
1317 * For all connectionless messages, by default new queue limits are
1320 * TIPC_LOW_IMPORTANCE (4 MB)
1321 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1322 * TIPC_HIGH_IMPORTANCE (16 MB)
1323 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1325 * Returns overload limit according to corresponding message importance
1327 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1329 struct tipc_msg *msg = buf_msg(buf);
1332 if (msg_connected(msg))
1333 limit = sysctl_tipc_rmem[2];
1335 limit = sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1336 msg_importance(msg);
1341 * filter_rcv - validate incoming message
1345 * Enqueues message on receive queue if acceptable; optionally handles
1346 * disconnect indication for a connected socket.
1348 * Called with socket lock already taken; port lock may also be taken.
1350 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1352 static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
1354 struct socket *sock = sk->sk_socket;
1355 struct tipc_msg *msg = buf_msg(buf);
1356 unsigned int limit = rcvbuf_limit(sk, buf);
1359 /* Reject message if it is wrong sort of message for socket */
1360 if (msg_type(msg) > TIPC_DIRECT_MSG)
1361 return TIPC_ERR_NO_PORT;
1363 if (sock->state == SS_READY) {
1364 if (msg_connected(msg))
1365 return TIPC_ERR_NO_PORT;
1367 res = filter_connect(tipc_sk(sk), &buf);
1368 if (res != TIPC_OK || buf == NULL)
1372 /* Reject message if there isn't room to queue it */
1373 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1374 return TIPC_ERR_OVERLOAD;
1376 /* Enqueue message */
1377 TIPC_SKB_CB(buf)->handle = NULL;
1378 __skb_queue_tail(&sk->sk_receive_queue, buf);
1379 skb_set_owner_r(buf, sk);
1381 sk->sk_data_ready(sk, 0);
1386 * backlog_rcv - handle incoming message from backlog queue
1390 * Caller must hold socket lock, but not port lock.
1394 static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1398 res = filter_rcv(sk, buf);
1400 tipc_reject_msg(buf, res);
1405 * dispatch - handle incoming message
1406 * @tport: TIPC port that received message
1409 * Called with port lock already taken.
1411 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1413 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1415 struct sock *sk = tport->sk;
1419 * Process message if socket is unlocked; otherwise add to backlog queue
1421 * This code is based on sk_receive_skb(), but must be distinct from it
1422 * since a TIPC-specific filter/reject mechanism is utilized
1425 if (!sock_owned_by_user(sk)) {
1426 res = filter_rcv(sk, buf);
1428 if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf)))
1429 res = TIPC_ERR_OVERLOAD;
1439 * wakeupdispatch - wake up port after congestion
1440 * @tport: port to wakeup
1442 * Called with port lock already taken.
1444 static void wakeupdispatch(struct tipc_port *tport)
1446 struct sock *sk = tport->sk;
1448 sk->sk_write_space(sk);
1452 * connect - establish a connection to another TIPC port
1453 * @sock: socket structure
1454 * @dest: socket address for destination port
1455 * @destlen: size of socket address data structure
1456 * @flags: file-related flags associated with socket
1458 * Returns 0 on success, errno otherwise
1460 static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
1463 struct sock *sk = sock->sk;
1464 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1465 struct msghdr m = {NULL,};
1466 unsigned int timeout;
1471 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1472 if (sock->state == SS_READY) {
1478 * Reject connection attempt using multicast address
1480 * Note: send_msg() validates the rest of the address fields,
1481 * so there's no need to do it here
1483 if (dst->addrtype == TIPC_ADDR_MCAST) {
1488 timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1490 switch (sock->state) {
1491 case SS_UNCONNECTED:
1492 /* Send a 'SYN-' to destination */
1494 m.msg_namelen = destlen;
1496 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1497 * indicate send_msg() is never blocked.
1500 m.msg_flags = MSG_DONTWAIT;
1502 res = send_msg(NULL, sock, &m, 0);
1503 if ((res < 0) && (res != -EWOULDBLOCK))
1506 /* Just entered SS_CONNECTING state; the only
1507 * difference is that return value in non-blocking
1508 * case is EINPROGRESS, rather than EALREADY.
1523 if (sock->state == SS_CONNECTING) {
1527 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1529 res = wait_event_interruptible_timeout(*sk_sleep(sk),
1530 sock->state != SS_CONNECTING,
1531 timeout ? (long)msecs_to_jiffies(timeout)
1532 : MAX_SCHEDULE_TIMEOUT);
1538 ; /* leave "res" unchanged */
1543 if (unlikely(sock->state == SS_DISCONNECTING))
1544 res = sock_error(sk);
1554 * listen - allow socket to listen for incoming connections
1555 * @sock: socket structure
1558 * Returns 0 on success, errno otherwise
1560 static int listen(struct socket *sock, int len)
1562 struct sock *sk = sock->sk;
1567 if (sock->state != SS_UNCONNECTED)
1570 sock->state = SS_LISTENING;
1579 * accept - wait for connection request
1580 * @sock: listening socket
1581 * @newsock: new socket that is to be connected
1582 * @flags: file-related flags associated with socket
1584 * Returns 0 on success, errno otherwise
1586 static int accept(struct socket *sock, struct socket *new_sock, int flags)
1588 struct sock *new_sk, *sk = sock->sk;
1589 struct sk_buff *buf;
1590 struct tipc_sock *new_tsock;
1591 struct tipc_port *new_tport;
1592 struct tipc_msg *msg;
1599 if (sock->state != SS_LISTENING) {
1604 while (skb_queue_empty(&sk->sk_receive_queue)) {
1605 if (flags & O_NONBLOCK) {
1610 res = wait_event_interruptible(*sk_sleep(sk),
1611 (!skb_queue_empty(&sk->sk_receive_queue)));
1617 buf = skb_peek(&sk->sk_receive_queue);
1619 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
1623 new_sk = new_sock->sk;
1624 new_tsock = tipc_sk(new_sk);
1625 new_tport = new_tsock->p;
1626 new_ref = new_tport->ref;
1629 /* we lock on new_sk; but lockdep sees the lock on sk */
1630 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
1633 * Reject any stray messages received by new socket
1634 * before the socket lock was taken (very, very unlikely)
1636 reject_rx_queue(new_sk);
1638 /* Connect new socket to it's peer */
1639 new_tsock->peer_name.ref = msg_origport(msg);
1640 new_tsock->peer_name.node = msg_orignode(msg);
1641 tipc_connect(new_ref, &new_tsock->peer_name);
1642 new_sock->state = SS_CONNECTED;
1644 tipc_set_portimportance(new_ref, msg_importance(msg));
1645 if (msg_named(msg)) {
1646 new_tport->conn_type = msg_nametype(msg);
1647 new_tport->conn_instance = msg_nameinst(msg);
1651 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1652 * Respond to 'SYN+' by queuing it on new socket.
1654 if (!msg_data_sz(msg)) {
1655 struct msghdr m = {NULL,};
1657 advance_rx_queue(sk);
1658 send_packet(NULL, new_sock, &m, 0);
1660 __skb_dequeue(&sk->sk_receive_queue);
1661 __skb_queue_head(&new_sk->sk_receive_queue, buf);
1662 skb_set_owner_r(buf, new_sk);
1664 release_sock(new_sk);
1672 * shutdown - shutdown socket connection
1673 * @sock: socket structure
1674 * @how: direction to close (must be SHUT_RDWR)
1676 * Terminates connection (if necessary), then purges socket's receive queue.
1678 * Returns 0 on success, errno otherwise
1680 static int shutdown(struct socket *sock, int how)
1682 struct sock *sk = sock->sk;
1683 struct tipc_port *tport = tipc_sk_port(sk);
1684 struct sk_buff *buf;
1687 if (how != SHUT_RDWR)
1692 switch (sock->state) {
1697 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1698 buf = __skb_dequeue(&sk->sk_receive_queue);
1700 if (TIPC_SKB_CB(buf)->handle != NULL) {
1704 tipc_disconnect(tport->ref);
1705 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1707 tipc_shutdown(tport->ref);
1710 sock->state = SS_DISCONNECTING;
1714 case SS_DISCONNECTING:
1716 /* Discard any unreceived messages */
1717 __skb_queue_purge(&sk->sk_receive_queue);
1719 /* Wake up anyone sleeping in poll */
1720 sk->sk_state_change(sk);
1733 * setsockopt - set socket option
1734 * @sock: socket structure
1735 * @lvl: option level
1736 * @opt: option identifier
1737 * @ov: pointer to new option value
1738 * @ol: length of option value
1740 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1741 * (to ease compatibility).
1743 * Returns 0 on success, errno otherwise
1745 static int setsockopt(struct socket *sock, int lvl, int opt, char __user *ov,
1748 struct sock *sk = sock->sk;
1749 struct tipc_port *tport = tipc_sk_port(sk);
1753 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1755 if (lvl != SOL_TIPC)
1756 return -ENOPROTOOPT;
1757 if (ol < sizeof(value))
1759 res = get_user(value, (u32 __user *)ov);
1766 case TIPC_IMPORTANCE:
1767 res = tipc_set_portimportance(tport->ref, value);
1769 case TIPC_SRC_DROPPABLE:
1770 if (sock->type != SOCK_STREAM)
1771 res = tipc_set_portunreliable(tport->ref, value);
1775 case TIPC_DEST_DROPPABLE:
1776 res = tipc_set_portunreturnable(tport->ref, value);
1778 case TIPC_CONN_TIMEOUT:
1779 tipc_sk(sk)->conn_timeout = value;
1780 /* no need to set "res", since already 0 at this point */
1792 * getsockopt - get socket option
1793 * @sock: socket structure
1794 * @lvl: option level
1795 * @opt: option identifier
1796 * @ov: receptacle for option value
1797 * @ol: receptacle for length of option value
1799 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1800 * (to ease compatibility).
1802 * Returns 0 on success, errno otherwise
1804 static int getsockopt(struct socket *sock, int lvl, int opt, char __user *ov,
1807 struct sock *sk = sock->sk;
1808 struct tipc_port *tport = tipc_sk_port(sk);
1813 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1814 return put_user(0, ol);
1815 if (lvl != SOL_TIPC)
1816 return -ENOPROTOOPT;
1817 res = get_user(len, ol);
1824 case TIPC_IMPORTANCE:
1825 res = tipc_portimportance(tport->ref, &value);
1827 case TIPC_SRC_DROPPABLE:
1828 res = tipc_portunreliable(tport->ref, &value);
1830 case TIPC_DEST_DROPPABLE:
1831 res = tipc_portunreturnable(tport->ref, &value);
1833 case TIPC_CONN_TIMEOUT:
1834 value = tipc_sk(sk)->conn_timeout;
1835 /* no need to set "res", since already 0 at this point */
1837 case TIPC_NODE_RECVQ_DEPTH:
1838 value = 0; /* was tipc_queue_size, now obsolete */
1840 case TIPC_SOCK_RECVQ_DEPTH:
1841 value = skb_queue_len(&sk->sk_receive_queue);
1850 return res; /* "get" failed */
1852 if (len < sizeof(value))
1855 if (copy_to_user(ov, &value, sizeof(value)))
1858 return put_user(sizeof(value), ol);
1861 /* Protocol switches for the various types of TIPC sockets */
1863 static const struct proto_ops msg_ops = {
1864 .owner = THIS_MODULE,
1869 .socketpair = sock_no_socketpair,
1870 .accept = sock_no_accept,
1871 .getname = get_name,
1873 .ioctl = sock_no_ioctl,
1874 .listen = sock_no_listen,
1875 .shutdown = shutdown,
1876 .setsockopt = setsockopt,
1877 .getsockopt = getsockopt,
1878 .sendmsg = send_msg,
1879 .recvmsg = recv_msg,
1880 .mmap = sock_no_mmap,
1881 .sendpage = sock_no_sendpage
1884 static const struct proto_ops packet_ops = {
1885 .owner = THIS_MODULE,
1890 .socketpair = sock_no_socketpair,
1892 .getname = get_name,
1894 .ioctl = sock_no_ioctl,
1896 .shutdown = shutdown,
1897 .setsockopt = setsockopt,
1898 .getsockopt = getsockopt,
1899 .sendmsg = send_packet,
1900 .recvmsg = recv_msg,
1901 .mmap = sock_no_mmap,
1902 .sendpage = sock_no_sendpage
1905 static const struct proto_ops stream_ops = {
1906 .owner = THIS_MODULE,
1911 .socketpair = sock_no_socketpair,
1913 .getname = get_name,
1915 .ioctl = sock_no_ioctl,
1917 .shutdown = shutdown,
1918 .setsockopt = setsockopt,
1919 .getsockopt = getsockopt,
1920 .sendmsg = send_stream,
1921 .recvmsg = recv_stream,
1922 .mmap = sock_no_mmap,
1923 .sendpage = sock_no_sendpage
1926 static const struct net_proto_family tipc_family_ops = {
1927 .owner = THIS_MODULE,
1929 .create = tipc_sk_create
1932 static struct proto tipc_proto = {
1934 .owner = THIS_MODULE,
1935 .obj_size = sizeof(struct tipc_sock),
1936 .sysctl_rmem = sysctl_tipc_rmem
1939 static struct proto tipc_proto_kern = {
1941 .obj_size = sizeof(struct tipc_sock),
1942 .sysctl_rmem = sysctl_tipc_rmem
1946 * tipc_socket_init - initialize TIPC socket interface
1948 * Returns 0 on success, errno otherwise
1950 int tipc_socket_init(void)
1954 res = proto_register(&tipc_proto, 1);
1956 pr_err("Failed to register TIPC protocol type\n");
1960 res = sock_register(&tipc_family_ops);
1962 pr_err("Failed to register TIPC socket type\n");
1963 proto_unregister(&tipc_proto);
1967 sockets_enabled = 1;
1973 * tipc_socket_stop - stop TIPC socket interface
1975 void tipc_socket_stop(void)
1977 if (!sockets_enabled)
1980 sockets_enabled = 0;
1981 sock_unregister(tipc_family_ops.family);
1982 proto_unregister(&tipc_proto);