2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2014, 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
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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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>
42 #define SS_LISTENING -1 /* socket is listening */
43 #define SS_READY -2 /* socket is connectionless */
45 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
47 static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
48 static void tipc_data_ready(struct sock *sk, int len);
49 static void tipc_write_space(struct sock *sk);
50 static int tipc_release(struct socket *sock);
51 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
53 static const struct proto_ops packet_ops;
54 static const struct proto_ops stream_ops;
55 static const struct proto_ops msg_ops;
57 static struct proto tipc_proto;
58 static struct proto tipc_proto_kern;
61 * Revised TIPC socket locking policy:
63 * Most socket operations take the standard socket lock when they start
64 * and hold it until they finish (or until they need to sleep). Acquiring
65 * this lock grants the owner exclusive access to the fields of the socket
66 * data structures, with the exception of the backlog queue. A few socket
67 * operations can be done without taking the socket lock because they only
68 * read socket information that never changes during the life of the socket.
70 * Socket operations may acquire the lock for the associated TIPC port if they
71 * need to perform an operation on the port. If any routine needs to acquire
72 * both the socket lock and the port lock it must take the socket lock first
73 * to avoid the risk of deadlock.
75 * The dispatcher handling incoming messages cannot grab the socket lock in
76 * the standard fashion, since invoked it runs at the BH level and cannot block.
77 * Instead, it checks to see if the socket lock is currently owned by someone,
78 * and either handles the message itself or adds it to the socket's backlog
79 * queue; in the latter case the queued message is processed once the process
80 * owning the socket lock releases it.
82 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
83 * the problem of a blocked socket operation preventing any other operations
84 * from occurring. However, applications must be careful if they have
85 * multiple threads trying to send (or receive) on the same socket, as these
86 * operations might interfere with each other. For example, doing a connect
87 * and a receive at the same time might allow the receive to consume the
88 * ACK message meant for the connect. While additional work could be done
89 * to try and overcome this, it doesn't seem to be worthwhile at the present.
91 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
92 * that another operation that must be performed in a non-blocking manner is
93 * not delayed for very long because the lock has already been taken.
95 * NOTE: This code assumes that certain fields of a port/socket pair are
96 * constant over its lifetime; such fields can be examined without taking
97 * the socket lock and/or port lock, and do not need to be re-read even
98 * after resuming processing after waiting. These fields include:
100 * - pointer to socket sk structure (aka tipc_sock structure)
101 * - pointer to port structure
108 * advance_rx_queue - discard first buffer in socket receive queue
110 * Caller must hold socket lock
112 static void advance_rx_queue(struct sock *sk)
114 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
118 * reject_rx_queue - reject all buffers in socket receive queue
120 * Caller must hold socket lock
122 static void reject_rx_queue(struct sock *sk)
126 while ((buf = __skb_dequeue(&sk->sk_receive_queue)))
127 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
131 * tipc_sk_create - create a TIPC socket
132 * @net: network namespace (must be default network)
133 * @sock: pre-allocated socket structure
134 * @protocol: protocol indicator (must be 0)
135 * @kern: caused by kernel or by userspace?
137 * This routine creates additional data structures used by the TIPC socket,
138 * initializes them, and links them together.
140 * Returns 0 on success, errno otherwise
142 static int tipc_sk_create(struct net *net, struct socket *sock,
143 int protocol, int kern)
145 const struct proto_ops *ops;
148 struct tipc_sock *tsk;
149 struct tipc_port *port;
152 /* Validate arguments */
153 if (unlikely(protocol != 0))
154 return -EPROTONOSUPPORT;
156 switch (sock->type) {
159 state = SS_UNCONNECTED;
163 state = SS_UNCONNECTED;
174 /* Allocate socket's protocol area */
176 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
178 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
186 ref = tipc_port_init(port, TIPC_LOW_IMPORTANCE);
188 pr_warn("Socket registration failed, ref. table exhausted\n");
193 /* Finish initializing socket data structures */
197 sock_init_data(sock, sk);
198 sk->sk_backlog_rcv = backlog_rcv;
199 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
200 sk->sk_data_ready = tipc_data_ready;
201 sk->sk_write_space = tipc_write_space;
202 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
203 tipc_port_unlock(port);
205 if (sock->state == SS_READY) {
206 tipc_port_set_unreturnable(port, true);
207 if (sock->type == SOCK_DGRAM)
208 tipc_port_set_unreliable(port, true);
214 * tipc_sock_create_local - create TIPC socket from inside TIPC module
215 * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
217 * We cannot use sock_creat_kern here because it bumps module user count.
218 * Since socket owner and creator is the same module we must make sure
219 * that module count remains zero for module local sockets, otherwise
220 * we cannot do rmmod.
222 * Returns 0 on success, errno otherwise
224 int tipc_sock_create_local(int type, struct socket **res)
228 rc = sock_create_lite(AF_TIPC, type, 0, res);
230 pr_err("Failed to create kernel socket\n");
233 tipc_sk_create(&init_net, *res, 0, 1);
239 * tipc_sock_release_local - release socket created by tipc_sock_create_local
240 * @sock: the socket to be released.
242 * Module reference count is not incremented when such sockets are created,
243 * so we must keep it from being decremented when they are released.
245 void tipc_sock_release_local(struct socket *sock)
253 * tipc_sock_accept_local - accept a connection on a socket created
254 * with tipc_sock_create_local. Use this function to avoid that
255 * module reference count is inadvertently incremented.
257 * @sock: the accepting socket
258 * @newsock: reference to the new socket to be created
259 * @flags: socket flags
262 int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
265 struct sock *sk = sock->sk;
268 ret = sock_create_lite(sk->sk_family, sk->sk_type,
269 sk->sk_protocol, newsock);
273 ret = tipc_accept(sock, *newsock, flags);
275 sock_release(*newsock);
278 (*newsock)->ops = sock->ops;
283 * tipc_release - destroy a TIPC socket
284 * @sock: socket to destroy
286 * This routine cleans up any messages that are still queued on the socket.
287 * For DGRAM and RDM socket types, all queued messages are rejected.
288 * For SEQPACKET and STREAM socket types, the first message is rejected
289 * and any others are discarded. (If the first message on a STREAM socket
290 * is partially-read, it is discarded and the next one is rejected instead.)
292 * NOTE: Rejected messages are not necessarily returned to the sender! They
293 * are returned or discarded according to the "destination droppable" setting
294 * specified for the message by the sender.
296 * Returns 0 on success, errno otherwise
298 static int tipc_release(struct socket *sock)
300 struct sock *sk = sock->sk;
301 struct tipc_sock *tsk;
302 struct tipc_port *port;
307 * Exit if socket isn't fully initialized (occurs when a failed accept()
308 * releases a pre-allocated child socket that was never used)
318 * Reject all unreceived messages, except on an active connection
319 * (which disconnects locally & sends a 'FIN+' to peer)
321 while (sock->state != SS_DISCONNECTING) {
322 buf = __skb_dequeue(&sk->sk_receive_queue);
325 if (TIPC_SKB_CB(buf)->handle != NULL)
328 if ((sock->state == SS_CONNECTING) ||
329 (sock->state == SS_CONNECTED)) {
330 sock->state = SS_DISCONNECTING;
331 tipc_port_disconnect(port->ref);
333 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
337 /* Destroy TIPC port; also disconnects an active connection and
338 * sends a 'FIN-' to peer.
340 tipc_port_destroy(port);
342 /* Discard any remaining (connection-based) messages in receive queue */
343 __skb_queue_purge(&sk->sk_receive_queue);
345 /* Reject any messages that accumulated in backlog queue */
346 sock->state = SS_DISCONNECTING;
356 * tipc_bind - associate or disassocate TIPC name(s) with a socket
357 * @sock: socket structure
358 * @uaddr: socket address describing name(s) and desired operation
359 * @uaddr_len: size of socket address data structure
361 * Name and name sequence binding is indicated using a positive scope value;
362 * a negative scope value unbinds the specified name. Specifying no name
363 * (i.e. a socket address length of 0) unbinds all names from the socket.
365 * Returns 0 on success, errno otherwise
367 * NOTE: This routine doesn't need to take the socket lock since it doesn't
368 * access any non-constant socket information.
370 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
373 struct sock *sk = sock->sk;
374 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
375 struct tipc_sock *tsk = tipc_sk(sk);
379 if (unlikely(!uaddr_len)) {
380 res = tipc_withdraw(&tsk->port, 0, NULL);
384 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
388 if (addr->family != AF_TIPC) {
393 if (addr->addrtype == TIPC_ADDR_NAME)
394 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
395 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
400 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
401 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
402 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
407 res = (addr->scope > 0) ?
408 tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) :
409 tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq);
416 * tipc_getname - get port ID of socket or peer socket
417 * @sock: socket structure
418 * @uaddr: area for returned socket address
419 * @uaddr_len: area for returned length of socket address
420 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
422 * Returns 0 on success, errno otherwise
424 * NOTE: This routine doesn't need to take the socket lock since it only
425 * accesses socket information that is unchanging (or which changes in
426 * a completely predictable manner).
428 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
429 int *uaddr_len, int peer)
431 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
432 struct tipc_sock *tsk = tipc_sk(sock->sk);
434 memset(addr, 0, sizeof(*addr));
436 if ((sock->state != SS_CONNECTED) &&
437 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
439 addr->addr.id.ref = tipc_port_peerport(&tsk->port);
440 addr->addr.id.node = tipc_port_peernode(&tsk->port);
442 addr->addr.id.ref = tsk->port.ref;
443 addr->addr.id.node = tipc_own_addr;
446 *uaddr_len = sizeof(*addr);
447 addr->addrtype = TIPC_ADDR_ID;
448 addr->family = AF_TIPC;
450 addr->addr.name.domain = 0;
456 * tipc_poll - read and possibly block on pollmask
457 * @file: file structure associated with the socket
458 * @sock: socket for which to calculate the poll bits
461 * Returns pollmask value
464 * It appears that the usual socket locking mechanisms are not useful here
465 * since the pollmask info is potentially out-of-date the moment this routine
466 * exits. TCP and other protocols seem to rely on higher level poll routines
467 * to handle any preventable race conditions, so TIPC will do the same ...
469 * TIPC sets the returned events as follows:
471 * socket state flags set
472 * ------------ ---------
473 * unconnected no read flags
474 * POLLOUT if port is not congested
476 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
479 * connected POLLIN/POLLRDNORM if data in rx queue
480 * POLLOUT if port is not congested
482 * disconnecting POLLIN/POLLRDNORM/POLLHUP
485 * listening POLLIN if SYN in rx queue
488 * ready POLLIN/POLLRDNORM if data in rx queue
489 * [connectionless] POLLOUT (since port cannot be congested)
491 * IMPORTANT: The fact that a read or write operation is indicated does NOT
492 * imply that the operation will succeed, merely that it should be performed
493 * and will not block.
495 static unsigned int tipc_poll(struct file *file, struct socket *sock,
498 struct sock *sk = sock->sk;
499 struct tipc_sock *tsk = tipc_sk(sk);
502 sock_poll_wait(file, sk_sleep(sk), wait);
504 switch ((int)sock->state) {
506 if (!tsk->port.congested)
511 if (!tsk->port.congested)
516 if (!skb_queue_empty(&sk->sk_receive_queue))
517 mask |= (POLLIN | POLLRDNORM);
519 case SS_DISCONNECTING:
520 mask = (POLLIN | POLLRDNORM | POLLHUP);
528 * dest_name_check - verify user is permitted to send to specified port name
529 * @dest: destination address
530 * @m: descriptor for message to be sent
532 * Prevents restricted configuration commands from being issued by
533 * unauthorized users.
535 * Returns 0 if permission is granted, otherwise errno
537 static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
539 struct tipc_cfg_msg_hdr hdr;
541 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
543 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
545 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
548 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
550 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
552 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
558 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
560 struct sock *sk = sock->sk;
561 struct tipc_sock *tsk = tipc_sk(sk);
566 int err = sock_error(sk);
569 if (sock->state == SS_DISCONNECTING)
573 if (signal_pending(current))
574 return sock_intr_errno(*timeo_p);
576 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
577 done = sk_wait_event(sk, timeo_p, !tsk->port.congested);
578 finish_wait(sk_sleep(sk), &wait);
585 * tipc_sendmsg - send message in connectionless manner
586 * @iocb: if NULL, indicates that socket lock is already held
587 * @sock: socket structure
588 * @m: message to send
589 * @total_len: length of message
591 * Message must have an destination specified explicitly.
592 * Used for SOCK_RDM and SOCK_DGRAM messages,
593 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
594 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
596 * Returns the number of bytes sent on success, or errno otherwise
598 static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
599 struct msghdr *m, size_t total_len)
601 struct sock *sk = sock->sk;
602 struct tipc_sock *tsk = tipc_sk(sk);
603 struct tipc_port *port = &tsk->port;
604 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
610 return -EDESTADDRREQ;
611 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
612 (dest->family != AF_TIPC)))
614 if (total_len > TIPC_MAX_USER_MSG_SIZE)
620 needs_conn = (sock->state != SS_READY);
621 if (unlikely(needs_conn)) {
622 if (sock->state == SS_LISTENING) {
626 if (sock->state != SS_UNCONNECTED) {
630 if (tsk->port.published) {
634 if (dest->addrtype == TIPC_ADDR_NAME) {
635 tsk->port.conn_type = dest->addr.name.name.type;
636 tsk->port.conn_instance = dest->addr.name.name.instance;
639 /* Abort any pending connection attempts (very unlikely) */
643 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
645 if (dest->addrtype == TIPC_ADDR_NAME) {
646 res = dest_name_check(dest, m);
649 res = tipc_send2name(port,
650 &dest->addr.name.name,
651 dest->addr.name.domain,
654 } else if (dest->addrtype == TIPC_ADDR_ID) {
655 res = tipc_send2port(port,
659 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
664 res = dest_name_check(dest, m);
667 res = tipc_port_mcast_xmit(port,
672 if (likely(res != -ELINKCONG)) {
673 if (needs_conn && (res >= 0))
674 sock->state = SS_CONNECTING;
677 res = tipc_wait_for_sndmsg(sock, &timeo);
688 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
690 struct sock *sk = sock->sk;
691 struct tipc_sock *tsk = tipc_sk(sk);
692 struct tipc_port *port = &tsk->port;
697 int err = sock_error(sk);
700 if (sock->state == SS_DISCONNECTING)
702 else if (sock->state != SS_CONNECTED)
706 if (signal_pending(current))
707 return sock_intr_errno(*timeo_p);
709 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
710 done = sk_wait_event(sk, timeo_p,
711 (!port->congested || !port->connected));
712 finish_wait(sk_sleep(sk), &wait);
718 * tipc_send_packet - send a connection-oriented message
719 * @iocb: if NULL, indicates that socket lock is already held
720 * @sock: socket structure
721 * @m: message to send
722 * @total_len: length of message
724 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
726 * Returns the number of bytes sent on success, or errno otherwise
728 static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
729 struct msghdr *m, size_t total_len)
731 struct sock *sk = sock->sk;
732 struct tipc_sock *tsk = tipc_sk(sk);
733 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
737 /* Handle implied connection establishment */
739 return tipc_sendmsg(iocb, sock, m, total_len);
741 if (total_len > TIPC_MAX_USER_MSG_SIZE)
747 if (unlikely(sock->state != SS_CONNECTED)) {
748 if (sock->state == SS_DISCONNECTING)
755 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
757 res = tipc_send(&tsk->port, m->msg_iov, total_len);
758 if (likely(res != -ELINKCONG))
760 res = tipc_wait_for_sndpkt(sock, &timeo);
771 * tipc_send_stream - send stream-oriented data
773 * @sock: socket structure
775 * @total_len: total length of data to be sent
777 * Used for SOCK_STREAM data.
779 * Returns the number of bytes sent on success (or partial success),
780 * or errno if no data sent
782 static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
783 struct msghdr *m, size_t total_len)
785 struct sock *sk = sock->sk;
786 struct tipc_sock *tsk = tipc_sk(sk);
787 struct msghdr my_msg;
789 struct iovec *curr_iov;
791 char __user *curr_start;
800 /* Handle special cases where there is no connection */
801 if (unlikely(sock->state != SS_CONNECTED)) {
802 if (sock->state == SS_UNCONNECTED)
803 res = tipc_send_packet(NULL, sock, m, total_len);
805 res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN;
809 if (unlikely(m->msg_name)) {
814 if (total_len > (unsigned int)INT_MAX) {
820 * Send each iovec entry using one or more messages
822 * Note: This algorithm is good for the most likely case
823 * (i.e. one large iovec entry), but could be improved to pass sets
824 * of small iovec entries into send_packet().
826 curr_iov = m->msg_iov;
827 curr_iovlen = m->msg_iovlen;
828 my_msg.msg_iov = &my_iov;
829 my_msg.msg_iovlen = 1;
830 my_msg.msg_flags = m->msg_flags;
831 my_msg.msg_name = NULL;
834 hdr_size = msg_hdr_sz(&tsk->port.phdr);
836 while (curr_iovlen--) {
837 curr_start = curr_iov->iov_base;
838 curr_left = curr_iov->iov_len;
841 bytes_to_send = tsk->port.max_pkt - hdr_size;
842 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
843 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
844 if (curr_left < bytes_to_send)
845 bytes_to_send = curr_left;
846 my_iov.iov_base = curr_start;
847 my_iov.iov_len = bytes_to_send;
848 res = tipc_send_packet(NULL, sock, &my_msg,
855 curr_left -= bytes_to_send;
856 curr_start += bytes_to_send;
857 bytes_sent += bytes_to_send;
869 * auto_connect - complete connection setup to a remote port
870 * @tsk: tipc socket structure
871 * @msg: peer's response message
873 * Returns 0 on success, errno otherwise
875 static int auto_connect(struct tipc_sock *tsk, struct tipc_msg *msg)
877 struct tipc_port *port = &tsk->port;
878 struct socket *sock = tsk->sk.sk_socket;
879 struct tipc_portid peer;
881 peer.ref = msg_origport(msg);
882 peer.node = msg_orignode(msg);
884 __tipc_port_connect(port->ref, port, &peer);
886 if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
888 msg_set_importance(&port->phdr, (u32)msg_importance(msg));
889 sock->state = SS_CONNECTED;
894 * set_orig_addr - capture sender's address for received message
895 * @m: descriptor for message info
896 * @msg: received message header
898 * Note: Address is not captured if not requested by receiver.
900 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
902 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
905 addr->family = AF_TIPC;
906 addr->addrtype = TIPC_ADDR_ID;
907 memset(&addr->addr, 0, sizeof(addr->addr));
908 addr->addr.id.ref = msg_origport(msg);
909 addr->addr.id.node = msg_orignode(msg);
910 addr->addr.name.domain = 0; /* could leave uninitialized */
911 addr->scope = 0; /* could leave uninitialized */
912 m->msg_namelen = sizeof(struct sockaddr_tipc);
917 * anc_data_recv - optionally capture ancillary data for received message
918 * @m: descriptor for message info
919 * @msg: received message header
920 * @tport: TIPC port associated with message
922 * Note: Ancillary data is not captured if not requested by receiver.
924 * Returns 0 if successful, otherwise errno
926 static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
927 struct tipc_port *tport)
935 if (likely(m->msg_controllen == 0))
938 /* Optionally capture errored message object(s) */
939 err = msg ? msg_errcode(msg) : 0;
942 anc_data[1] = msg_data_sz(msg);
943 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
947 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
954 /* Optionally capture message destination object */
955 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
959 anc_data[0] = msg_nametype(msg);
960 anc_data[1] = msg_namelower(msg);
961 anc_data[2] = msg_namelower(msg);
965 anc_data[0] = msg_nametype(msg);
966 anc_data[1] = msg_namelower(msg);
967 anc_data[2] = msg_nameupper(msg);
970 has_name = (tport->conn_type != 0);
971 anc_data[0] = tport->conn_type;
972 anc_data[1] = tport->conn_instance;
973 anc_data[2] = tport->conn_instance;
979 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
987 static int tipc_wait_for_rcvmsg(struct socket *sock, long timeo)
989 struct sock *sk = sock->sk;
994 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
995 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
996 if (sock->state == SS_DISCONNECTING) {
1001 timeo = schedule_timeout(timeo);
1005 if (!skb_queue_empty(&sk->sk_receive_queue))
1007 err = sock_intr_errno(timeo);
1008 if (signal_pending(current))
1014 finish_wait(sk_sleep(sk), &wait);
1019 * tipc_recvmsg - receive packet-oriented message
1021 * @m: descriptor for message info
1022 * @buf_len: total size of user buffer area
1023 * @flags: receive flags
1025 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1026 * If the complete message doesn't fit in user area, truncate it.
1028 * Returns size of returned message data, errno otherwise
1030 static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
1031 struct msghdr *m, size_t buf_len, int flags)
1033 struct sock *sk = sock->sk;
1034 struct tipc_sock *tsk = tipc_sk(sk);
1035 struct tipc_port *port = &tsk->port;
1036 struct sk_buff *buf;
1037 struct tipc_msg *msg;
1043 /* Catch invalid receive requests */
1044 if (unlikely(!buf_len))
1049 if (unlikely(sock->state == SS_UNCONNECTED)) {
1054 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1057 /* Look for a message in receive queue; wait if necessary */
1058 res = tipc_wait_for_rcvmsg(sock, timeo);
1062 /* Look at first message in receive queue */
1063 buf = skb_peek(&sk->sk_receive_queue);
1065 sz = msg_data_sz(msg);
1066 err = msg_errcode(msg);
1068 /* Discard an empty non-errored message & try again */
1069 if ((!sz) && (!err)) {
1070 advance_rx_queue(sk);
1074 /* Capture sender's address (optional) */
1075 set_orig_addr(m, msg);
1077 /* Capture ancillary data (optional) */
1078 res = anc_data_recv(m, msg, port);
1082 /* Capture message data (if valid) & compute return value (always) */
1084 if (unlikely(buf_len < sz)) {
1086 m->msg_flags |= MSG_TRUNC;
1088 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
1094 if ((sock->state == SS_READY) ||
1095 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1101 /* Consume received message (optional) */
1102 if (likely(!(flags & MSG_PEEK))) {
1103 if ((sock->state != SS_READY) &&
1104 (++port->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1105 tipc_acknowledge(port->ref, port->conn_unacked);
1106 advance_rx_queue(sk);
1114 * tipc_recv_stream - receive stream-oriented data
1116 * @m: descriptor for message info
1117 * @buf_len: total size of user buffer area
1118 * @flags: receive flags
1120 * Used for SOCK_STREAM messages only. If not enough data is available
1121 * will optionally wait for more; never truncates data.
1123 * Returns size of returned message data, errno otherwise
1125 static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
1126 struct msghdr *m, size_t buf_len, int flags)
1128 struct sock *sk = sock->sk;
1129 struct tipc_sock *tsk = tipc_sk(sk);
1130 struct tipc_port *port = &tsk->port;
1131 struct sk_buff *buf;
1132 struct tipc_msg *msg;
1135 int sz_to_copy, target, needed;
1140 /* Catch invalid receive attempts */
1141 if (unlikely(!buf_len))
1146 if (unlikely(sock->state == SS_UNCONNECTED)) {
1151 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1152 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1155 /* Look for a message in receive queue; wait if necessary */
1156 res = tipc_wait_for_rcvmsg(sock, timeo);
1160 /* Look at first message in receive queue */
1161 buf = skb_peek(&sk->sk_receive_queue);
1163 sz = msg_data_sz(msg);
1164 err = msg_errcode(msg);
1166 /* Discard an empty non-errored message & try again */
1167 if ((!sz) && (!err)) {
1168 advance_rx_queue(sk);
1172 /* Optionally capture sender's address & ancillary data of first msg */
1173 if (sz_copied == 0) {
1174 set_orig_addr(m, msg);
1175 res = anc_data_recv(m, msg, port);
1180 /* Capture message data (if valid) & compute return value (always) */
1182 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1185 needed = (buf_len - sz_copied);
1186 sz_to_copy = (sz <= needed) ? sz : needed;
1188 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1189 m->msg_iov, sz_to_copy);
1193 sz_copied += sz_to_copy;
1195 if (sz_to_copy < sz) {
1196 if (!(flags & MSG_PEEK))
1197 TIPC_SKB_CB(buf)->handle =
1198 (void *)(unsigned long)(offset + sz_to_copy);
1203 goto exit; /* can't add error msg to valid data */
1205 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1211 /* Consume received message (optional) */
1212 if (likely(!(flags & MSG_PEEK))) {
1213 if (unlikely(++port->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1214 tipc_acknowledge(port->ref, port->conn_unacked);
1215 advance_rx_queue(sk);
1218 /* Loop around if more data is required */
1219 if ((sz_copied < buf_len) && /* didn't get all requested data */
1220 (!skb_queue_empty(&sk->sk_receive_queue) ||
1221 (sz_copied < target)) && /* and more is ready or required */
1222 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1223 (!err)) /* and haven't reached a FIN */
1228 return sz_copied ? sz_copied : res;
1232 * tipc_write_space - wake up thread if port congestion is released
1235 static void tipc_write_space(struct sock *sk)
1237 struct socket_wq *wq;
1240 wq = rcu_dereference(sk->sk_wq);
1241 if (wq_has_sleeper(wq))
1242 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1243 POLLWRNORM | POLLWRBAND);
1248 * tipc_data_ready - wake up threads to indicate messages have been received
1250 * @len: the length of messages
1252 static void tipc_data_ready(struct sock *sk, int len)
1254 struct socket_wq *wq;
1257 wq = rcu_dereference(sk->sk_wq);
1258 if (wq_has_sleeper(wq))
1259 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1260 POLLRDNORM | POLLRDBAND);
1265 * filter_connect - Handle all incoming messages for a connection-based socket
1269 * Returns TIPC error status code and socket error status code
1270 * once it encounters some errors
1272 static u32 filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
1274 struct sock *sk = &tsk->sk;
1275 struct tipc_port *port = &tsk->port;
1276 struct socket *sock = sk->sk_socket;
1277 struct tipc_msg *msg = buf_msg(*buf);
1279 u32 retval = TIPC_ERR_NO_PORT;
1285 switch ((int)sock->state) {
1287 /* Accept only connection-based messages sent by peer */
1288 if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) {
1289 if (unlikely(msg_errcode(msg))) {
1290 sock->state = SS_DISCONNECTING;
1291 __tipc_port_disconnect(port);
1297 /* Accept only ACK or NACK message */
1298 if (unlikely(msg_errcode(msg))) {
1299 sock->state = SS_DISCONNECTING;
1300 sk->sk_err = ECONNREFUSED;
1305 if (unlikely(!msg_connected(msg)))
1308 res = auto_connect(tsk, msg);
1310 sock->state = SS_DISCONNECTING;
1316 /* If an incoming message is an 'ACK-', it should be
1317 * discarded here because it doesn't contain useful
1318 * data. In addition, we should try to wake up
1319 * connect() routine if sleeping.
1321 if (msg_data_sz(msg) == 0) {
1324 if (waitqueue_active(sk_sleep(sk)))
1325 wake_up_interruptible(sk_sleep(sk));
1330 case SS_UNCONNECTED:
1331 /* Accept only SYN message */
1332 if (!msg_connected(msg) && !(msg_errcode(msg)))
1335 case SS_DISCONNECTING:
1338 pr_err("Unknown socket state %u\n", sock->state);
1344 * rcvbuf_limit - get proper overload limit of socket receive queue
1348 * For all connection oriented messages, irrespective of importance,
1349 * the default overload value (i.e. 67MB) is set as limit.
1351 * For all connectionless messages, by default new queue limits are
1354 * TIPC_LOW_IMPORTANCE (4 MB)
1355 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1356 * TIPC_HIGH_IMPORTANCE (16 MB)
1357 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1359 * Returns overload limit according to corresponding message importance
1361 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1363 struct tipc_msg *msg = buf_msg(buf);
1365 if (msg_connected(msg))
1366 return sysctl_tipc_rmem[2];
1368 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1369 msg_importance(msg);
1373 * filter_rcv - validate incoming message
1377 * Enqueues message on receive queue if acceptable; optionally handles
1378 * disconnect indication for a connected socket.
1380 * Called with socket lock already taken; port lock may also be taken.
1382 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1384 static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
1386 struct socket *sock = sk->sk_socket;
1387 struct tipc_sock *tsk = tipc_sk(sk);
1388 struct tipc_msg *msg = buf_msg(buf);
1389 unsigned int limit = rcvbuf_limit(sk, buf);
1392 /* Reject message if it is wrong sort of message for socket */
1393 if (msg_type(msg) > TIPC_DIRECT_MSG)
1394 return TIPC_ERR_NO_PORT;
1396 if (sock->state == SS_READY) {
1397 if (msg_connected(msg))
1398 return TIPC_ERR_NO_PORT;
1400 res = filter_connect(tsk, &buf);
1401 if (res != TIPC_OK || buf == NULL)
1405 /* Reject message if there isn't room to queue it */
1406 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1407 return TIPC_ERR_OVERLOAD;
1409 /* Enqueue message */
1410 TIPC_SKB_CB(buf)->handle = NULL;
1411 __skb_queue_tail(&sk->sk_receive_queue, buf);
1412 skb_set_owner_r(buf, sk);
1414 sk->sk_data_ready(sk, 0);
1419 * backlog_rcv - handle incoming message from backlog queue
1423 * Caller must hold socket lock, but not port lock.
1427 static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1431 res = filter_rcv(sk, buf);
1433 tipc_reject_msg(buf, res);
1438 * tipc_sk_rcv - handle incoming message
1439 * @sk: socket receiving message
1442 * Called with port lock already taken.
1444 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1446 u32 tipc_sk_rcv(struct sock *sk, struct sk_buff *buf)
1451 * Process message if socket is unlocked; otherwise add to backlog queue
1453 * This code is based on sk_receive_skb(), but must be distinct from it
1454 * since a TIPC-specific filter/reject mechanism is utilized
1457 if (!sock_owned_by_user(sk)) {
1458 res = filter_rcv(sk, buf);
1460 if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf)))
1461 res = TIPC_ERR_OVERLOAD;
1470 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1472 struct sock *sk = sock->sk;
1477 int err = sock_error(sk);
1482 if (signal_pending(current))
1483 return sock_intr_errno(*timeo_p);
1485 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1486 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1487 finish_wait(sk_sleep(sk), &wait);
1493 * tipc_connect - establish a connection to another TIPC port
1494 * @sock: socket structure
1495 * @dest: socket address for destination port
1496 * @destlen: size of socket address data structure
1497 * @flags: file-related flags associated with socket
1499 * Returns 0 on success, errno otherwise
1501 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1502 int destlen, int flags)
1504 struct sock *sk = sock->sk;
1505 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1506 struct msghdr m = {NULL,};
1507 long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1508 socket_state previous;
1513 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1514 if (sock->state == SS_READY) {
1520 * Reject connection attempt using multicast address
1522 * Note: send_msg() validates the rest of the address fields,
1523 * so there's no need to do it here
1525 if (dst->addrtype == TIPC_ADDR_MCAST) {
1530 previous = sock->state;
1531 switch (sock->state) {
1532 case SS_UNCONNECTED:
1533 /* Send a 'SYN-' to destination */
1535 m.msg_namelen = destlen;
1537 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1538 * indicate send_msg() is never blocked.
1541 m.msg_flags = MSG_DONTWAIT;
1543 res = tipc_sendmsg(NULL, sock, &m, 0);
1544 if ((res < 0) && (res != -EWOULDBLOCK))
1547 /* Just entered SS_CONNECTING state; the only
1548 * difference is that return value in non-blocking
1549 * case is EINPROGRESS, rather than EALREADY.
1553 if (previous == SS_CONNECTING)
1557 timeout = msecs_to_jiffies(timeout);
1558 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1559 res = tipc_wait_for_connect(sock, &timeout);
1574 * tipc_listen - allow socket to listen for incoming connections
1575 * @sock: socket structure
1578 * Returns 0 on success, errno otherwise
1580 static int tipc_listen(struct socket *sock, int len)
1582 struct sock *sk = sock->sk;
1587 if (sock->state != SS_UNCONNECTED)
1590 sock->state = SS_LISTENING;
1598 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1600 struct sock *sk = sock->sk;
1604 /* True wake-one mechanism for incoming connections: only
1605 * one process gets woken up, not the 'whole herd'.
1606 * Since we do not 'race & poll' for established sockets
1607 * anymore, the common case will execute the loop only once.
1610 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1611 TASK_INTERRUPTIBLE);
1612 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1614 timeo = schedule_timeout(timeo);
1618 if (!skb_queue_empty(&sk->sk_receive_queue))
1621 if (sock->state != SS_LISTENING)
1623 err = sock_intr_errno(timeo);
1624 if (signal_pending(current))
1630 finish_wait(sk_sleep(sk), &wait);
1635 * tipc_accept - wait for connection request
1636 * @sock: listening socket
1637 * @newsock: new socket that is to be connected
1638 * @flags: file-related flags associated with socket
1640 * Returns 0 on success, errno otherwise
1642 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1644 struct sock *new_sk, *sk = sock->sk;
1645 struct sk_buff *buf;
1646 struct tipc_port *new_port;
1647 struct tipc_msg *msg;
1648 struct tipc_portid peer;
1655 if (sock->state != SS_LISTENING) {
1659 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1660 res = tipc_wait_for_accept(sock, timeo);
1664 buf = skb_peek(&sk->sk_receive_queue);
1666 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
1670 new_sk = new_sock->sk;
1671 new_port = &tipc_sk(new_sk)->port;
1672 new_ref = new_port->ref;
1675 /* we lock on new_sk; but lockdep sees the lock on sk */
1676 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
1679 * Reject any stray messages received by new socket
1680 * before the socket lock was taken (very, very unlikely)
1682 reject_rx_queue(new_sk);
1684 /* Connect new socket to it's peer */
1685 peer.ref = msg_origport(msg);
1686 peer.node = msg_orignode(msg);
1687 tipc_port_connect(new_ref, &peer);
1688 new_sock->state = SS_CONNECTED;
1690 tipc_port_set_importance(new_port, msg_importance(msg));
1691 if (msg_named(msg)) {
1692 new_port->conn_type = msg_nametype(msg);
1693 new_port->conn_instance = msg_nameinst(msg);
1697 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1698 * Respond to 'SYN+' by queuing it on new socket.
1700 if (!msg_data_sz(msg)) {
1701 struct msghdr m = {NULL,};
1703 advance_rx_queue(sk);
1704 tipc_send_packet(NULL, new_sock, &m, 0);
1706 __skb_dequeue(&sk->sk_receive_queue);
1707 __skb_queue_head(&new_sk->sk_receive_queue, buf);
1708 skb_set_owner_r(buf, new_sk);
1710 release_sock(new_sk);
1717 * tipc_shutdown - shutdown socket connection
1718 * @sock: socket structure
1719 * @how: direction to close (must be SHUT_RDWR)
1721 * Terminates connection (if necessary), then purges socket's receive queue.
1723 * Returns 0 on success, errno otherwise
1725 static int tipc_shutdown(struct socket *sock, int how)
1727 struct sock *sk = sock->sk;
1728 struct tipc_sock *tsk = tipc_sk(sk);
1729 struct tipc_port *port = &tsk->port;
1730 struct sk_buff *buf;
1733 if (how != SHUT_RDWR)
1738 switch (sock->state) {
1743 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1744 buf = __skb_dequeue(&sk->sk_receive_queue);
1746 if (TIPC_SKB_CB(buf)->handle != NULL) {
1750 tipc_port_disconnect(port->ref);
1751 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1753 tipc_port_shutdown(port->ref);
1756 sock->state = SS_DISCONNECTING;
1760 case SS_DISCONNECTING:
1762 /* Discard any unreceived messages */
1763 __skb_queue_purge(&sk->sk_receive_queue);
1765 /* Wake up anyone sleeping in poll */
1766 sk->sk_state_change(sk);
1779 * tipc_setsockopt - set socket option
1780 * @sock: socket structure
1781 * @lvl: option level
1782 * @opt: option identifier
1783 * @ov: pointer to new option value
1784 * @ol: length of option value
1786 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1787 * (to ease compatibility).
1789 * Returns 0 on success, errno otherwise
1791 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
1792 char __user *ov, unsigned int ol)
1794 struct sock *sk = sock->sk;
1795 struct tipc_sock *tsk = tipc_sk(sk);
1796 struct tipc_port *port = &tsk->port;
1800 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1802 if (lvl != SOL_TIPC)
1803 return -ENOPROTOOPT;
1804 if (ol < sizeof(value))
1806 res = get_user(value, (u32 __user *)ov);
1813 case TIPC_IMPORTANCE:
1814 tipc_port_set_importance(port, value);
1816 case TIPC_SRC_DROPPABLE:
1817 if (sock->type != SOCK_STREAM)
1818 tipc_port_set_unreliable(port, value);
1822 case TIPC_DEST_DROPPABLE:
1823 tipc_port_set_unreturnable(port, value);
1825 case TIPC_CONN_TIMEOUT:
1826 tipc_sk(sk)->conn_timeout = value;
1827 /* no need to set "res", since already 0 at this point */
1839 * tipc_getsockopt - get socket option
1840 * @sock: socket structure
1841 * @lvl: option level
1842 * @opt: option identifier
1843 * @ov: receptacle for option value
1844 * @ol: receptacle for length of option value
1846 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1847 * (to ease compatibility).
1849 * Returns 0 on success, errno otherwise
1851 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
1852 char __user *ov, int __user *ol)
1854 struct sock *sk = sock->sk;
1855 struct tipc_sock *tsk = tipc_sk(sk);
1856 struct tipc_port *port = &tsk->port;
1861 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1862 return put_user(0, ol);
1863 if (lvl != SOL_TIPC)
1864 return -ENOPROTOOPT;
1865 res = get_user(len, ol);
1872 case TIPC_IMPORTANCE:
1873 value = tipc_port_importance(port);
1875 case TIPC_SRC_DROPPABLE:
1876 value = tipc_port_unreliable(port);
1878 case TIPC_DEST_DROPPABLE:
1879 value = tipc_port_unreturnable(port);
1881 case TIPC_CONN_TIMEOUT:
1882 value = tipc_sk(sk)->conn_timeout;
1883 /* no need to set "res", since already 0 at this point */
1885 case TIPC_NODE_RECVQ_DEPTH:
1886 value = 0; /* was tipc_queue_size, now obsolete */
1888 case TIPC_SOCK_RECVQ_DEPTH:
1889 value = skb_queue_len(&sk->sk_receive_queue);
1898 return res; /* "get" failed */
1900 if (len < sizeof(value))
1903 if (copy_to_user(ov, &value, sizeof(value)))
1906 return put_user(sizeof(value), ol);
1909 /* Protocol switches for the various types of TIPC sockets */
1911 static const struct proto_ops msg_ops = {
1912 .owner = THIS_MODULE,
1914 .release = tipc_release,
1916 .connect = tipc_connect,
1917 .socketpair = sock_no_socketpair,
1918 .accept = sock_no_accept,
1919 .getname = tipc_getname,
1921 .ioctl = sock_no_ioctl,
1922 .listen = sock_no_listen,
1923 .shutdown = tipc_shutdown,
1924 .setsockopt = tipc_setsockopt,
1925 .getsockopt = tipc_getsockopt,
1926 .sendmsg = tipc_sendmsg,
1927 .recvmsg = tipc_recvmsg,
1928 .mmap = sock_no_mmap,
1929 .sendpage = sock_no_sendpage
1932 static const struct proto_ops packet_ops = {
1933 .owner = THIS_MODULE,
1935 .release = tipc_release,
1937 .connect = tipc_connect,
1938 .socketpair = sock_no_socketpair,
1939 .accept = tipc_accept,
1940 .getname = tipc_getname,
1942 .ioctl = sock_no_ioctl,
1943 .listen = tipc_listen,
1944 .shutdown = tipc_shutdown,
1945 .setsockopt = tipc_setsockopt,
1946 .getsockopt = tipc_getsockopt,
1947 .sendmsg = tipc_send_packet,
1948 .recvmsg = tipc_recvmsg,
1949 .mmap = sock_no_mmap,
1950 .sendpage = sock_no_sendpage
1953 static const struct proto_ops stream_ops = {
1954 .owner = THIS_MODULE,
1956 .release = tipc_release,
1958 .connect = tipc_connect,
1959 .socketpair = sock_no_socketpair,
1960 .accept = tipc_accept,
1961 .getname = tipc_getname,
1963 .ioctl = sock_no_ioctl,
1964 .listen = tipc_listen,
1965 .shutdown = tipc_shutdown,
1966 .setsockopt = tipc_setsockopt,
1967 .getsockopt = tipc_getsockopt,
1968 .sendmsg = tipc_send_stream,
1969 .recvmsg = tipc_recv_stream,
1970 .mmap = sock_no_mmap,
1971 .sendpage = sock_no_sendpage
1974 static const struct net_proto_family tipc_family_ops = {
1975 .owner = THIS_MODULE,
1977 .create = tipc_sk_create
1980 static struct proto tipc_proto = {
1982 .owner = THIS_MODULE,
1983 .obj_size = sizeof(struct tipc_sock),
1984 .sysctl_rmem = sysctl_tipc_rmem
1987 static struct proto tipc_proto_kern = {
1989 .obj_size = sizeof(struct tipc_sock),
1990 .sysctl_rmem = sysctl_tipc_rmem
1994 * tipc_socket_init - initialize TIPC socket interface
1996 * Returns 0 on success, errno otherwise
1998 int tipc_socket_init(void)
2002 res = proto_register(&tipc_proto, 1);
2004 pr_err("Failed to register TIPC protocol type\n");
2008 res = sock_register(&tipc_family_ops);
2010 pr_err("Failed to register TIPC socket type\n");
2011 proto_unregister(&tipc_proto);
2019 * tipc_socket_stop - stop TIPC socket interface
2021 void tipc_socket_stop(void)
2023 sock_unregister(tipc_family_ops.family);
2024 proto_unregister(&tipc_proto);