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 static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
59 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
60 static void wakeupdispatch(struct tipc_port *tport);
61 static void tipc_data_ready(struct sock *sk, int len);
62 static void tipc_write_space(struct sock *sk);
63 static int tipc_release(struct socket *sock);
64 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
66 static const struct proto_ops packet_ops;
67 static const struct proto_ops stream_ops;
68 static const struct proto_ops msg_ops;
70 static struct proto tipc_proto;
71 static struct proto tipc_proto_kern;
73 static int sockets_enabled;
76 * Revised TIPC socket locking policy:
78 * Most socket operations take the standard socket lock when they start
79 * and hold it until they finish (or until they need to sleep). Acquiring
80 * this lock grants the owner exclusive access to the fields of the socket
81 * data structures, with the exception of the backlog queue. A few socket
82 * operations can be done without taking the socket lock because they only
83 * read socket information that never changes during the life of the socket.
85 * Socket operations may acquire the lock for the associated TIPC port if they
86 * need to perform an operation on the port. If any routine needs to acquire
87 * both the socket lock and the port lock it must take the socket lock first
88 * to avoid the risk of deadlock.
90 * The dispatcher handling incoming messages cannot grab the socket lock in
91 * the standard fashion, since invoked it runs at the BH level and cannot block.
92 * Instead, it checks to see if the socket lock is currently owned by someone,
93 * and either handles the message itself or adds it to the socket's backlog
94 * queue; in the latter case the queued message is processed once the process
95 * owning the socket lock releases it.
97 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
98 * the problem of a blocked socket operation preventing any other operations
99 * from occurring. However, applications must be careful if they have
100 * multiple threads trying to send (or receive) on the same socket, as these
101 * operations might interfere with each other. For example, doing a connect
102 * and a receive at the same time might allow the receive to consume the
103 * ACK message meant for the connect. While additional work could be done
104 * to try and overcome this, it doesn't seem to be worthwhile at the present.
106 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
107 * that another operation that must be performed in a non-blocking manner is
108 * not delayed for very long because the lock has already been taken.
110 * NOTE: This code assumes that certain fields of a port/socket pair are
111 * constant over its lifetime; such fields can be examined without taking
112 * the socket lock and/or port lock, and do not need to be re-read even
113 * after resuming processing after waiting. These fields include:
115 * - pointer to socket sk structure (aka tipc_sock structure)
116 * - pointer to port structure
121 * advance_rx_queue - discard first buffer in socket receive queue
123 * Caller must hold socket lock
125 static void advance_rx_queue(struct sock *sk)
127 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
131 * reject_rx_queue - reject all buffers in socket receive queue
133 * Caller must hold socket lock
135 static void reject_rx_queue(struct sock *sk)
139 while ((buf = __skb_dequeue(&sk->sk_receive_queue)))
140 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
144 * tipc_sk_create - create a TIPC socket
145 * @net: network namespace (must be default network)
146 * @sock: pre-allocated socket structure
147 * @protocol: protocol indicator (must be 0)
148 * @kern: caused by kernel or by userspace?
150 * This routine creates additional data structures used by the TIPC socket,
151 * initializes them, and links them together.
153 * Returns 0 on success, errno otherwise
155 static int tipc_sk_create(struct net *net, struct socket *sock, int protocol,
158 const struct proto_ops *ops;
161 struct tipc_port *tp_ptr;
163 /* Validate arguments */
164 if (unlikely(protocol != 0))
165 return -EPROTONOSUPPORT;
167 switch (sock->type) {
170 state = SS_UNCONNECTED;
174 state = SS_UNCONNECTED;
185 /* Allocate socket's protocol area */
187 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
189 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
194 /* Allocate TIPC port for socket to use */
195 tp_ptr = tipc_createport(sk, &dispatch, &wakeupdispatch,
196 TIPC_LOW_IMPORTANCE);
197 if (unlikely(!tp_ptr)) {
202 /* Finish initializing socket data structures */
206 sock_init_data(sock, sk);
207 sk->sk_backlog_rcv = backlog_rcv;
208 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
209 sk->sk_data_ready = tipc_data_ready;
210 sk->sk_write_space = tipc_write_space;
211 tipc_sk(sk)->p = tp_ptr;
212 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
214 spin_unlock_bh(tp_ptr->lock);
216 if (sock->state == SS_READY) {
217 tipc_set_portunreturnable(tp_ptr->ref, 1);
218 if (sock->type == SOCK_DGRAM)
219 tipc_set_portunreliable(tp_ptr->ref, 1);
226 * tipc_sock_create_local - create TIPC socket from inside TIPC module
227 * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
229 * We cannot use sock_creat_kern here because it bumps module user count.
230 * Since socket owner and creator is the same module we must make sure
231 * that module count remains zero for module local sockets, otherwise
232 * we cannot do rmmod.
234 * Returns 0 on success, errno otherwise
236 int tipc_sock_create_local(int type, struct socket **res)
240 rc = sock_create_lite(AF_TIPC, type, 0, res);
242 pr_err("Failed to create kernel socket\n");
245 tipc_sk_create(&init_net, *res, 0, 1);
251 * tipc_sock_release_local - release socket created by tipc_sock_create_local
252 * @sock: the socket to be released.
254 * Module reference count is not incremented when such sockets are created,
255 * so we must keep it from being decremented when they are released.
257 void tipc_sock_release_local(struct socket *sock)
265 * tipc_sock_accept_local - accept a connection on a socket created
266 * with tipc_sock_create_local. Use this function to avoid that
267 * module reference count is inadvertently incremented.
269 * @sock: the accepting socket
270 * @newsock: reference to the new socket to be created
271 * @flags: socket flags
274 int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
277 struct sock *sk = sock->sk;
280 ret = sock_create_lite(sk->sk_family, sk->sk_type,
281 sk->sk_protocol, newsock);
285 ret = tipc_accept(sock, *newsock, flags);
287 sock_release(*newsock);
290 (*newsock)->ops = sock->ops;
295 * tipc_release - destroy a TIPC socket
296 * @sock: socket to destroy
298 * This routine cleans up any messages that are still queued on the socket.
299 * For DGRAM and RDM socket types, all queued messages are rejected.
300 * For SEQPACKET and STREAM socket types, the first message is rejected
301 * and any others are discarded. (If the first message on a STREAM socket
302 * is partially-read, it is discarded and the next one is rejected instead.)
304 * NOTE: Rejected messages are not necessarily returned to the sender! They
305 * are returned or discarded according to the "destination droppable" setting
306 * specified for the message by the sender.
308 * Returns 0 on success, errno otherwise
310 static int tipc_release(struct socket *sock)
312 struct sock *sk = sock->sk;
313 struct tipc_port *tport;
318 * Exit if socket isn't fully initialized (occurs when a failed accept()
319 * releases a pre-allocated child socket that was never used)
324 tport = tipc_sk_port(sk);
328 * Reject all unreceived messages, except on an active connection
329 * (which disconnects locally & sends a 'FIN+' to peer)
331 while (sock->state != SS_DISCONNECTING) {
332 buf = __skb_dequeue(&sk->sk_receive_queue);
335 if (TIPC_SKB_CB(buf)->handle != NULL)
338 if ((sock->state == SS_CONNECTING) ||
339 (sock->state == SS_CONNECTED)) {
340 sock->state = SS_DISCONNECTING;
341 tipc_port_disconnect(tport->ref);
343 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
348 * Delete TIPC port; this ensures no more messages are queued
349 * (also disconnects an active connection & sends a 'FIN-' to peer)
351 res = tipc_deleteport(tport);
353 /* Discard any remaining (connection-based) messages in receive queue */
354 __skb_queue_purge(&sk->sk_receive_queue);
356 /* Reject any messages that accumulated in backlog queue */
357 sock->state = SS_DISCONNECTING;
367 * tipc_bind - associate or disassocate TIPC name(s) with a socket
368 * @sock: socket structure
369 * @uaddr: socket address describing name(s) and desired operation
370 * @uaddr_len: size of socket address data structure
372 * Name and name sequence binding is indicated using a positive scope value;
373 * a negative scope value unbinds the specified name. Specifying no name
374 * (i.e. a socket address length of 0) unbinds all names from the socket.
376 * Returns 0 on success, errno otherwise
378 * NOTE: This routine doesn't need to take the socket lock since it doesn't
379 * access any non-constant socket information.
381 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
384 struct sock *sk = sock->sk;
385 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
386 struct tipc_port *tport = tipc_sk_port(sock->sk);
390 if (unlikely(!uaddr_len)) {
391 res = tipc_withdraw(tport, 0, NULL);
395 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
399 if (addr->family != AF_TIPC) {
404 if (addr->addrtype == TIPC_ADDR_NAME)
405 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
406 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
411 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
412 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
413 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
418 res = (addr->scope > 0) ?
419 tipc_publish(tport, addr->scope, &addr->addr.nameseq) :
420 tipc_withdraw(tport, -addr->scope, &addr->addr.nameseq);
427 * tipc_getname - get port ID of socket or peer socket
428 * @sock: socket structure
429 * @uaddr: area for returned socket address
430 * @uaddr_len: area for returned length of socket address
431 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
433 * Returns 0 on success, errno otherwise
435 * NOTE: This routine doesn't need to take the socket lock since it only
436 * accesses socket information that is unchanging (or which changes in
437 * a completely predictable manner).
439 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
440 int *uaddr_len, int peer)
442 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
443 struct tipc_sock *tsock = tipc_sk(sock->sk);
445 memset(addr, 0, sizeof(*addr));
447 if ((sock->state != SS_CONNECTED) &&
448 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
450 addr->addr.id.ref = tsock->peer_name.ref;
451 addr->addr.id.node = tsock->peer_name.node;
453 addr->addr.id.ref = tsock->p->ref;
454 addr->addr.id.node = tipc_own_addr;
457 *uaddr_len = sizeof(*addr);
458 addr->addrtype = TIPC_ADDR_ID;
459 addr->family = AF_TIPC;
461 addr->addr.name.domain = 0;
467 * tipc_poll - read and possibly block on pollmask
468 * @file: file structure associated with the socket
469 * @sock: socket for which to calculate the poll bits
472 * Returns pollmask value
475 * It appears that the usual socket locking mechanisms are not useful here
476 * since the pollmask info is potentially out-of-date the moment this routine
477 * exits. TCP and other protocols seem to rely on higher level poll routines
478 * to handle any preventable race conditions, so TIPC will do the same ...
480 * TIPC sets the returned events as follows:
482 * socket state flags set
483 * ------------ ---------
484 * unconnected no read flags
485 * POLLOUT if port is not congested
487 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
490 * connected POLLIN/POLLRDNORM if data in rx queue
491 * POLLOUT if port is not congested
493 * disconnecting POLLIN/POLLRDNORM/POLLHUP
496 * listening POLLIN if SYN in rx queue
499 * ready POLLIN/POLLRDNORM if data in rx queue
500 * [connectionless] POLLOUT (since port cannot be congested)
502 * IMPORTANT: The fact that a read or write operation is indicated does NOT
503 * imply that the operation will succeed, merely that it should be performed
504 * and will not block.
506 static unsigned int tipc_poll(struct file *file, struct socket *sock,
509 struct sock *sk = sock->sk;
512 sock_poll_wait(file, sk_sleep(sk), wait);
514 switch ((int)sock->state) {
516 if (!tipc_sk_port(sk)->congested)
521 if (!tipc_sk_port(sk)->congested)
526 if (!skb_queue_empty(&sk->sk_receive_queue))
527 mask |= (POLLIN | POLLRDNORM);
529 case SS_DISCONNECTING:
530 mask = (POLLIN | POLLRDNORM | POLLHUP);
538 * dest_name_check - verify user is permitted to send to specified port name
539 * @dest: destination address
540 * @m: descriptor for message to be sent
542 * Prevents restricted configuration commands from being issued by
543 * unauthorized users.
545 * Returns 0 if permission is granted, otherwise errno
547 static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
549 struct tipc_cfg_msg_hdr hdr;
551 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
553 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
555 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
558 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
560 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
562 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
568 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
570 struct sock *sk = sock->sk;
571 struct tipc_port *tport = tipc_sk_port(sk);
576 int err = sock_error(sk);
579 if (sock->state == SS_DISCONNECTING)
583 if (signal_pending(current))
584 return sock_intr_errno(*timeo_p);
586 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
587 done = sk_wait_event(sk, timeo_p, !tport->congested);
588 finish_wait(sk_sleep(sk), &wait);
594 * tipc_sendmsg - send message in connectionless manner
595 * @iocb: if NULL, indicates that socket lock is already held
596 * @sock: socket structure
597 * @m: message to send
598 * @total_len: length of message
600 * Message must have an destination specified explicitly.
601 * Used for SOCK_RDM and SOCK_DGRAM messages,
602 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
603 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
605 * Returns the number of bytes sent on success, or errno otherwise
607 static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
608 struct msghdr *m, size_t total_len)
610 struct sock *sk = sock->sk;
611 struct tipc_port *tport = tipc_sk_port(sk);
612 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
618 return -EDESTADDRREQ;
619 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
620 (dest->family != AF_TIPC)))
622 if (total_len > TIPC_MAX_USER_MSG_SIZE)
628 needs_conn = (sock->state != SS_READY);
629 if (unlikely(needs_conn)) {
630 if (sock->state == SS_LISTENING) {
634 if (sock->state != SS_UNCONNECTED) {
638 if (tport->published) {
642 if (dest->addrtype == TIPC_ADDR_NAME) {
643 tport->conn_type = dest->addr.name.name.type;
644 tport->conn_instance = dest->addr.name.name.instance;
647 /* Abort any pending connection attempts (very unlikely) */
651 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
653 if (dest->addrtype == TIPC_ADDR_NAME) {
654 res = dest_name_check(dest, m);
657 res = tipc_send2name(tport->ref,
658 &dest->addr.name.name,
659 dest->addr.name.domain,
662 } else if (dest->addrtype == TIPC_ADDR_ID) {
663 res = tipc_send2port(tport->ref,
667 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
672 res = dest_name_check(dest, m);
675 res = tipc_port_mcast_xmit(tport->ref,
680 if (likely(res != -ELINKCONG)) {
681 if (needs_conn && (res >= 0))
682 sock->state = SS_CONNECTING;
685 res = tipc_wait_for_sndmsg(sock, &timeo);
696 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
698 struct sock *sk = sock->sk;
699 struct tipc_port *tport = tipc_sk_port(sk);
704 int err = sock_error(sk);
707 if (sock->state == SS_DISCONNECTING)
709 else if (sock->state != SS_CONNECTED)
713 if (signal_pending(current))
714 return sock_intr_errno(*timeo_p);
716 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
717 done = sk_wait_event(sk, timeo_p,
718 (!tport->congested || !tport->connected));
719 finish_wait(sk_sleep(sk), &wait);
725 * tipc_send_packet - send a connection-oriented message
726 * @iocb: if NULL, indicates that socket lock is already held
727 * @sock: socket structure
728 * @m: message to send
729 * @total_len: length of message
731 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
733 * Returns the number of bytes sent on success, or errno otherwise
735 static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
736 struct msghdr *m, size_t total_len)
738 struct sock *sk = sock->sk;
739 struct tipc_port *tport = tipc_sk_port(sk);
740 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
744 /* Handle implied connection establishment */
746 return tipc_sendmsg(iocb, sock, m, total_len);
748 if (total_len > TIPC_MAX_USER_MSG_SIZE)
754 if (unlikely(sock->state != SS_CONNECTED)) {
755 if (sock->state == SS_DISCONNECTING)
762 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
764 res = tipc_send(tport->ref, m->msg_iov, total_len);
765 if (likely(res != -ELINKCONG))
767 res = tipc_wait_for_sndpkt(sock, &timeo);
778 * tipc_send_stream - send stream-oriented data
780 * @sock: socket structure
782 * @total_len: total length of data to be sent
784 * Used for SOCK_STREAM data.
786 * Returns the number of bytes sent on success (or partial success),
787 * or errno if no data sent
789 static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
790 struct msghdr *m, size_t total_len)
792 struct sock *sk = sock->sk;
793 struct tipc_port *tport = tipc_sk_port(sk);
794 struct msghdr my_msg;
796 struct iovec *curr_iov;
798 char __user *curr_start;
807 /* Handle special cases where there is no connection */
808 if (unlikely(sock->state != SS_CONNECTED)) {
809 if (sock->state == SS_UNCONNECTED)
810 res = tipc_send_packet(NULL, sock, m, total_len);
812 res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN;
816 if (unlikely(m->msg_name)) {
821 if (total_len > (unsigned int)INT_MAX) {
827 * Send each iovec entry using one or more messages
829 * Note: This algorithm is good for the most likely case
830 * (i.e. one large iovec entry), but could be improved to pass sets
831 * of small iovec entries into send_packet().
833 curr_iov = m->msg_iov;
834 curr_iovlen = m->msg_iovlen;
835 my_msg.msg_iov = &my_iov;
836 my_msg.msg_iovlen = 1;
837 my_msg.msg_flags = m->msg_flags;
838 my_msg.msg_name = NULL;
841 hdr_size = msg_hdr_sz(&tport->phdr);
843 while (curr_iovlen--) {
844 curr_start = curr_iov->iov_base;
845 curr_left = curr_iov->iov_len;
848 bytes_to_send = tport->max_pkt - hdr_size;
849 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
850 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
851 if (curr_left < bytes_to_send)
852 bytes_to_send = curr_left;
853 my_iov.iov_base = curr_start;
854 my_iov.iov_len = bytes_to_send;
855 res = tipc_send_packet(NULL, sock, &my_msg,
862 curr_left -= bytes_to_send;
863 curr_start += bytes_to_send;
864 bytes_sent += bytes_to_send;
876 * auto_connect - complete connection setup to a remote port
877 * @sock: socket structure
878 * @msg: peer's response message
880 * Returns 0 on success, errno otherwise
882 static int auto_connect(struct socket *sock, struct tipc_msg *msg)
884 struct tipc_sock *tsock = tipc_sk(sock->sk);
885 struct tipc_port *p_ptr;
887 tsock->peer_name.ref = msg_origport(msg);
888 tsock->peer_name.node = msg_orignode(msg);
889 p_ptr = tipc_port_deref(tsock->p->ref);
893 __tipc_port_connect(tsock->p->ref, p_ptr, &tsock->peer_name);
895 if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
897 msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg));
898 sock->state = SS_CONNECTED;
903 * set_orig_addr - capture sender's address for received message
904 * @m: descriptor for message info
905 * @msg: received message header
907 * Note: Address is not captured if not requested by receiver.
909 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
911 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
914 addr->family = AF_TIPC;
915 addr->addrtype = TIPC_ADDR_ID;
916 memset(&addr->addr, 0, sizeof(addr->addr));
917 addr->addr.id.ref = msg_origport(msg);
918 addr->addr.id.node = msg_orignode(msg);
919 addr->addr.name.domain = 0; /* could leave uninitialized */
920 addr->scope = 0; /* could leave uninitialized */
921 m->msg_namelen = sizeof(struct sockaddr_tipc);
926 * anc_data_recv - optionally capture ancillary data for received message
927 * @m: descriptor for message info
928 * @msg: received message header
929 * @tport: TIPC port associated with message
931 * Note: Ancillary data is not captured if not requested by receiver.
933 * Returns 0 if successful, otherwise errno
935 static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
936 struct tipc_port *tport)
944 if (likely(m->msg_controllen == 0))
947 /* Optionally capture errored message object(s) */
948 err = msg ? msg_errcode(msg) : 0;
951 anc_data[1] = msg_data_sz(msg);
952 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
956 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
963 /* Optionally capture message destination object */
964 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
968 anc_data[0] = msg_nametype(msg);
969 anc_data[1] = msg_namelower(msg);
970 anc_data[2] = msg_namelower(msg);
974 anc_data[0] = msg_nametype(msg);
975 anc_data[1] = msg_namelower(msg);
976 anc_data[2] = msg_nameupper(msg);
979 has_name = (tport->conn_type != 0);
980 anc_data[0] = tport->conn_type;
981 anc_data[1] = tport->conn_instance;
982 anc_data[2] = tport->conn_instance;
988 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
996 static int tipc_wait_for_rcvmsg(struct socket *sock, long timeo)
998 struct sock *sk = sock->sk;
1003 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1004 if (skb_queue_empty(&sk->sk_receive_queue)) {
1005 if (sock->state == SS_DISCONNECTING) {
1010 timeo = schedule_timeout(timeo);
1014 if (!skb_queue_empty(&sk->sk_receive_queue))
1016 err = sock_intr_errno(timeo);
1017 if (signal_pending(current))
1023 finish_wait(sk_sleep(sk), &wait);
1028 * tipc_recvmsg - receive packet-oriented message
1030 * @m: descriptor for message info
1031 * @buf_len: total size of user buffer area
1032 * @flags: receive flags
1034 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1035 * If the complete message doesn't fit in user area, truncate it.
1037 * Returns size of returned message data, errno otherwise
1039 static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
1040 struct msghdr *m, size_t buf_len, int flags)
1042 struct sock *sk = sock->sk;
1043 struct tipc_port *tport = tipc_sk_port(sk);
1044 struct sk_buff *buf;
1045 struct tipc_msg *msg;
1051 /* Catch invalid receive requests */
1052 if (unlikely(!buf_len))
1057 if (unlikely(sock->state == SS_UNCONNECTED)) {
1062 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1065 /* Look for a message in receive queue; wait if necessary */
1066 res = tipc_wait_for_rcvmsg(sock, timeo);
1070 /* Look at first message in receive queue */
1071 buf = skb_peek(&sk->sk_receive_queue);
1073 sz = msg_data_sz(msg);
1074 err = msg_errcode(msg);
1076 /* Discard an empty non-errored message & try again */
1077 if ((!sz) && (!err)) {
1078 advance_rx_queue(sk);
1082 /* Capture sender's address (optional) */
1083 set_orig_addr(m, msg);
1085 /* Capture ancillary data (optional) */
1086 res = anc_data_recv(m, msg, tport);
1090 /* Capture message data (if valid) & compute return value (always) */
1092 if (unlikely(buf_len < sz)) {
1094 m->msg_flags |= MSG_TRUNC;
1096 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
1102 if ((sock->state == SS_READY) ||
1103 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1109 /* Consume received message (optional) */
1110 if (likely(!(flags & MSG_PEEK))) {
1111 if ((sock->state != SS_READY) &&
1112 (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1113 tipc_acknowledge(tport->ref, tport->conn_unacked);
1114 advance_rx_queue(sk);
1122 * tipc_recv_stream - receive stream-oriented data
1124 * @m: descriptor for message info
1125 * @buf_len: total size of user buffer area
1126 * @flags: receive flags
1128 * Used for SOCK_STREAM messages only. If not enough data is available
1129 * will optionally wait for more; never truncates data.
1131 * Returns size of returned message data, errno otherwise
1133 static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
1134 struct msghdr *m, size_t buf_len, int flags)
1136 struct sock *sk = sock->sk;
1137 struct tipc_port *tport = tipc_sk_port(sk);
1138 struct sk_buff *buf;
1139 struct tipc_msg *msg;
1142 int sz_to_copy, target, needed;
1147 /* Catch invalid receive attempts */
1148 if (unlikely(!buf_len))
1153 if (unlikely(sock->state == SS_UNCONNECTED)) {
1158 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1159 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1162 /* Look for a message in receive queue; wait if necessary */
1163 res = tipc_wait_for_rcvmsg(sock, timeo);
1167 /* Look at first message in receive queue */
1168 buf = skb_peek(&sk->sk_receive_queue);
1170 sz = msg_data_sz(msg);
1171 err = msg_errcode(msg);
1173 /* Discard an empty non-errored message & try again */
1174 if ((!sz) && (!err)) {
1175 advance_rx_queue(sk);
1179 /* Optionally capture sender's address & ancillary data of first msg */
1180 if (sz_copied == 0) {
1181 set_orig_addr(m, msg);
1182 res = anc_data_recv(m, msg, tport);
1187 /* Capture message data (if valid) & compute return value (always) */
1189 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1192 needed = (buf_len - sz_copied);
1193 sz_to_copy = (sz <= needed) ? sz : needed;
1195 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1196 m->msg_iov, sz_to_copy);
1200 sz_copied += sz_to_copy;
1202 if (sz_to_copy < sz) {
1203 if (!(flags & MSG_PEEK))
1204 TIPC_SKB_CB(buf)->handle =
1205 (void *)(unsigned long)(offset + sz_to_copy);
1210 goto exit; /* can't add error msg to valid data */
1212 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1218 /* Consume received message (optional) */
1219 if (likely(!(flags & MSG_PEEK))) {
1220 if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1221 tipc_acknowledge(tport->ref, tport->conn_unacked);
1222 advance_rx_queue(sk);
1225 /* Loop around if more data is required */
1226 if ((sz_copied < buf_len) && /* didn't get all requested data */
1227 (!skb_queue_empty(&sk->sk_receive_queue) ||
1228 (sz_copied < target)) && /* and more is ready or required */
1229 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1230 (!err)) /* and haven't reached a FIN */
1235 return sz_copied ? sz_copied : res;
1239 * tipc_write_space - wake up thread if port congestion is released
1242 static void tipc_write_space(struct sock *sk)
1244 struct socket_wq *wq;
1247 wq = rcu_dereference(sk->sk_wq);
1248 if (wq_has_sleeper(wq))
1249 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1250 POLLWRNORM | POLLWRBAND);
1255 * tipc_data_ready - wake up threads to indicate messages have been received
1257 * @len: the length of messages
1259 static void tipc_data_ready(struct sock *sk, int len)
1261 struct socket_wq *wq;
1264 wq = rcu_dereference(sk->sk_wq);
1265 if (wq_has_sleeper(wq))
1266 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1267 POLLRDNORM | POLLRDBAND);
1272 * filter_connect - Handle all incoming messages for a connection-based socket
1273 * @tsock: TIPC socket
1276 * Returns TIPC error status code and socket error status code
1277 * once it encounters some errors
1279 static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf)
1281 struct socket *sock = tsock->sk.sk_socket;
1282 struct tipc_msg *msg = buf_msg(*buf);
1283 struct sock *sk = &tsock->sk;
1284 u32 retval = TIPC_ERR_NO_PORT;
1290 switch ((int)sock->state) {
1292 /* Accept only connection-based messages sent by peer */
1293 if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) {
1294 if (unlikely(msg_errcode(msg))) {
1295 sock->state = SS_DISCONNECTING;
1296 __tipc_port_disconnect(tsock->p);
1302 /* Accept only ACK or NACK message */
1303 if (unlikely(msg_errcode(msg))) {
1304 sock->state = SS_DISCONNECTING;
1305 sk->sk_err = ECONNREFUSED;
1310 if (unlikely(!msg_connected(msg)))
1313 res = auto_connect(sock, msg);
1315 sock->state = SS_DISCONNECTING;
1321 /* If an incoming message is an 'ACK-', it should be
1322 * discarded here because it doesn't contain useful
1323 * data. In addition, we should try to wake up
1324 * connect() routine if sleeping.
1326 if (msg_data_sz(msg) == 0) {
1329 if (waitqueue_active(sk_sleep(sk)))
1330 wake_up_interruptible(sk_sleep(sk));
1335 case SS_UNCONNECTED:
1336 /* Accept only SYN message */
1337 if (!msg_connected(msg) && !(msg_errcode(msg)))
1340 case SS_DISCONNECTING:
1343 pr_err("Unknown socket state %u\n", sock->state);
1349 * rcvbuf_limit - get proper overload limit of socket receive queue
1353 * For all connection oriented messages, irrespective of importance,
1354 * the default overload value (i.e. 67MB) is set as limit.
1356 * For all connectionless messages, by default new queue limits are
1359 * TIPC_LOW_IMPORTANCE (4 MB)
1360 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1361 * TIPC_HIGH_IMPORTANCE (16 MB)
1362 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1364 * Returns overload limit according to corresponding message importance
1366 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1368 struct tipc_msg *msg = buf_msg(buf);
1370 if (msg_connected(msg))
1371 return sysctl_tipc_rmem[2];
1373 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1374 msg_importance(msg);
1378 * filter_rcv - validate incoming message
1382 * Enqueues message on receive queue if acceptable; optionally handles
1383 * disconnect indication for a connected socket.
1385 * Called with socket lock already taken; port lock may also be taken.
1387 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1389 static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
1391 struct socket *sock = sk->sk_socket;
1392 struct tipc_msg *msg = buf_msg(buf);
1393 unsigned int limit = rcvbuf_limit(sk, buf);
1396 /* Reject message if it is wrong sort of message for socket */
1397 if (msg_type(msg) > TIPC_DIRECT_MSG)
1398 return TIPC_ERR_NO_PORT;
1400 if (sock->state == SS_READY) {
1401 if (msg_connected(msg))
1402 return TIPC_ERR_NO_PORT;
1404 res = filter_connect(tipc_sk(sk), &buf);
1405 if (res != TIPC_OK || buf == NULL)
1409 /* Reject message if there isn't room to queue it */
1410 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1411 return TIPC_ERR_OVERLOAD;
1413 /* Enqueue message */
1414 TIPC_SKB_CB(buf)->handle = NULL;
1415 __skb_queue_tail(&sk->sk_receive_queue, buf);
1416 skb_set_owner_r(buf, sk);
1418 sk->sk_data_ready(sk, 0);
1423 * backlog_rcv - handle incoming message from backlog queue
1427 * Caller must hold socket lock, but not port lock.
1431 static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1435 res = filter_rcv(sk, buf);
1437 tipc_reject_msg(buf, res);
1442 * dispatch - handle incoming message
1443 * @tport: TIPC port that received message
1446 * Called with port lock already taken.
1448 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1450 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1452 struct sock *sk = tport->sk;
1456 * Process message if socket is unlocked; otherwise add to backlog queue
1458 * This code is based on sk_receive_skb(), but must be distinct from it
1459 * since a TIPC-specific filter/reject mechanism is utilized
1462 if (!sock_owned_by_user(sk)) {
1463 res = filter_rcv(sk, buf);
1465 if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf)))
1466 res = TIPC_ERR_OVERLOAD;
1476 * wakeupdispatch - wake up port after congestion
1477 * @tport: port to wakeup
1479 * Called with port lock already taken.
1481 static void wakeupdispatch(struct tipc_port *tport)
1483 struct sock *sk = tport->sk;
1485 sk->sk_write_space(sk);
1488 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1490 struct sock *sk = sock->sk;
1495 int err = sock_error(sk);
1500 if (signal_pending(current))
1501 return sock_intr_errno(*timeo_p);
1503 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1504 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1505 finish_wait(sk_sleep(sk), &wait);
1511 * tipc_connect - establish a connection to another TIPC port
1512 * @sock: socket structure
1513 * @dest: socket address for destination port
1514 * @destlen: size of socket address data structure
1515 * @flags: file-related flags associated with socket
1517 * Returns 0 on success, errno otherwise
1519 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1520 int destlen, int flags)
1522 struct sock *sk = sock->sk;
1523 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1524 struct msghdr m = {NULL,};
1525 long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1526 socket_state previous;
1531 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1532 if (sock->state == SS_READY) {
1538 * Reject connection attempt using multicast address
1540 * Note: send_msg() validates the rest of the address fields,
1541 * so there's no need to do it here
1543 if (dst->addrtype == TIPC_ADDR_MCAST) {
1548 previous = sock->state;
1549 switch (sock->state) {
1550 case SS_UNCONNECTED:
1551 /* Send a 'SYN-' to destination */
1553 m.msg_namelen = destlen;
1555 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1556 * indicate send_msg() is never blocked.
1559 m.msg_flags = MSG_DONTWAIT;
1561 res = tipc_sendmsg(NULL, sock, &m, 0);
1562 if ((res < 0) && (res != -EWOULDBLOCK))
1565 /* Just entered SS_CONNECTING state; the only
1566 * difference is that return value in non-blocking
1567 * case is EINPROGRESS, rather than EALREADY.
1571 if (previous == SS_CONNECTING)
1575 timeout = msecs_to_jiffies(timeout);
1576 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1577 res = tipc_wait_for_connect(sock, &timeout);
1592 * tipc_listen - allow socket to listen for incoming connections
1593 * @sock: socket structure
1596 * Returns 0 on success, errno otherwise
1598 static int tipc_listen(struct socket *sock, int len)
1600 struct sock *sk = sock->sk;
1605 if (sock->state != SS_UNCONNECTED)
1608 sock->state = SS_LISTENING;
1616 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1618 struct sock *sk = sock->sk;
1622 /* True wake-one mechanism for incoming connections: only
1623 * one process gets woken up, not the 'whole herd'.
1624 * Since we do not 'race & poll' for established sockets
1625 * anymore, the common case will execute the loop only once.
1628 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1629 TASK_INTERRUPTIBLE);
1630 if (skb_queue_empty(&sk->sk_receive_queue)) {
1632 timeo = schedule_timeout(timeo);
1636 if (!skb_queue_empty(&sk->sk_receive_queue))
1639 if (sock->state != SS_LISTENING)
1641 err = sock_intr_errno(timeo);
1642 if (signal_pending(current))
1648 finish_wait(sk_sleep(sk), &wait);
1653 * tipc_accept - wait for connection request
1654 * @sock: listening socket
1655 * @newsock: new socket that is to be connected
1656 * @flags: file-related flags associated with socket
1658 * Returns 0 on success, errno otherwise
1660 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1662 struct sock *new_sk, *sk = sock->sk;
1663 struct sk_buff *buf;
1664 struct tipc_sock *new_tsock;
1665 struct tipc_port *new_tport;
1666 struct tipc_msg *msg;
1673 if (sock->state != SS_LISTENING) {
1678 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1679 res = tipc_wait_for_accept(sock, timeo);
1683 buf = skb_peek(&sk->sk_receive_queue);
1685 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
1689 new_sk = new_sock->sk;
1690 new_tsock = tipc_sk(new_sk);
1691 new_tport = new_tsock->p;
1692 new_ref = new_tport->ref;
1695 /* we lock on new_sk; but lockdep sees the lock on sk */
1696 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
1699 * Reject any stray messages received by new socket
1700 * before the socket lock was taken (very, very unlikely)
1702 reject_rx_queue(new_sk);
1704 /* Connect new socket to it's peer */
1705 new_tsock->peer_name.ref = msg_origport(msg);
1706 new_tsock->peer_name.node = msg_orignode(msg);
1707 tipc_port_connect(new_ref, &new_tsock->peer_name);
1708 new_sock->state = SS_CONNECTED;
1710 tipc_set_portimportance(new_ref, msg_importance(msg));
1711 if (msg_named(msg)) {
1712 new_tport->conn_type = msg_nametype(msg);
1713 new_tport->conn_instance = msg_nameinst(msg);
1717 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1718 * Respond to 'SYN+' by queuing it on new socket.
1720 if (!msg_data_sz(msg)) {
1721 struct msghdr m = {NULL,};
1723 advance_rx_queue(sk);
1724 tipc_send_packet(NULL, new_sock, &m, 0);
1726 __skb_dequeue(&sk->sk_receive_queue);
1727 __skb_queue_head(&new_sk->sk_receive_queue, buf);
1728 skb_set_owner_r(buf, new_sk);
1730 release_sock(new_sk);
1738 * tipc_shutdown - shutdown socket connection
1739 * @sock: socket structure
1740 * @how: direction to close (must be SHUT_RDWR)
1742 * Terminates connection (if necessary), then purges socket's receive queue.
1744 * Returns 0 on success, errno otherwise
1746 static int tipc_shutdown(struct socket *sock, int how)
1748 struct sock *sk = sock->sk;
1749 struct tipc_port *tport = tipc_sk_port(sk);
1750 struct sk_buff *buf;
1753 if (how != SHUT_RDWR)
1758 switch (sock->state) {
1763 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1764 buf = __skb_dequeue(&sk->sk_receive_queue);
1766 if (TIPC_SKB_CB(buf)->handle != NULL) {
1770 tipc_port_disconnect(tport->ref);
1771 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1773 tipc_port_shutdown(tport->ref);
1776 sock->state = SS_DISCONNECTING;
1780 case SS_DISCONNECTING:
1782 /* Discard any unreceived messages */
1783 __skb_queue_purge(&sk->sk_receive_queue);
1785 /* Wake up anyone sleeping in poll */
1786 sk->sk_state_change(sk);
1799 * tipc_setsockopt - set socket option
1800 * @sock: socket structure
1801 * @lvl: option level
1802 * @opt: option identifier
1803 * @ov: pointer to new option value
1804 * @ol: length of option value
1806 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1807 * (to ease compatibility).
1809 * Returns 0 on success, errno otherwise
1811 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
1812 char __user *ov, unsigned int ol)
1814 struct sock *sk = sock->sk;
1815 struct tipc_port *tport = tipc_sk_port(sk);
1819 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1821 if (lvl != SOL_TIPC)
1822 return -ENOPROTOOPT;
1823 if (ol < sizeof(value))
1825 res = get_user(value, (u32 __user *)ov);
1832 case TIPC_IMPORTANCE:
1833 res = tipc_set_portimportance(tport->ref, value);
1835 case TIPC_SRC_DROPPABLE:
1836 if (sock->type != SOCK_STREAM)
1837 res = tipc_set_portunreliable(tport->ref, value);
1841 case TIPC_DEST_DROPPABLE:
1842 res = tipc_set_portunreturnable(tport->ref, value);
1844 case TIPC_CONN_TIMEOUT:
1845 tipc_sk(sk)->conn_timeout = value;
1846 /* no need to set "res", since already 0 at this point */
1858 * tipc_getsockopt - get socket option
1859 * @sock: socket structure
1860 * @lvl: option level
1861 * @opt: option identifier
1862 * @ov: receptacle for option value
1863 * @ol: receptacle for length of option value
1865 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1866 * (to ease compatibility).
1868 * Returns 0 on success, errno otherwise
1870 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
1871 char __user *ov, int __user *ol)
1873 struct sock *sk = sock->sk;
1874 struct tipc_port *tport = tipc_sk_port(sk);
1879 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1880 return put_user(0, ol);
1881 if (lvl != SOL_TIPC)
1882 return -ENOPROTOOPT;
1883 res = get_user(len, ol);
1890 case TIPC_IMPORTANCE:
1891 res = tipc_portimportance(tport->ref, &value);
1893 case TIPC_SRC_DROPPABLE:
1894 res = tipc_portunreliable(tport->ref, &value);
1896 case TIPC_DEST_DROPPABLE:
1897 res = tipc_portunreturnable(tport->ref, &value);
1899 case TIPC_CONN_TIMEOUT:
1900 value = tipc_sk(sk)->conn_timeout;
1901 /* no need to set "res", since already 0 at this point */
1903 case TIPC_NODE_RECVQ_DEPTH:
1904 value = 0; /* was tipc_queue_size, now obsolete */
1906 case TIPC_SOCK_RECVQ_DEPTH:
1907 value = skb_queue_len(&sk->sk_receive_queue);
1916 return res; /* "get" failed */
1918 if (len < sizeof(value))
1921 if (copy_to_user(ov, &value, sizeof(value)))
1924 return put_user(sizeof(value), ol);
1927 /* Protocol switches for the various types of TIPC sockets */
1929 static const struct proto_ops msg_ops = {
1930 .owner = THIS_MODULE,
1932 .release = tipc_release,
1934 .connect = tipc_connect,
1935 .socketpair = sock_no_socketpair,
1936 .accept = sock_no_accept,
1937 .getname = tipc_getname,
1939 .ioctl = sock_no_ioctl,
1940 .listen = sock_no_listen,
1941 .shutdown = tipc_shutdown,
1942 .setsockopt = tipc_setsockopt,
1943 .getsockopt = tipc_getsockopt,
1944 .sendmsg = tipc_sendmsg,
1945 .recvmsg = tipc_recvmsg,
1946 .mmap = sock_no_mmap,
1947 .sendpage = sock_no_sendpage
1950 static const struct proto_ops packet_ops = {
1951 .owner = THIS_MODULE,
1953 .release = tipc_release,
1955 .connect = tipc_connect,
1956 .socketpair = sock_no_socketpair,
1957 .accept = tipc_accept,
1958 .getname = tipc_getname,
1960 .ioctl = sock_no_ioctl,
1961 .listen = tipc_listen,
1962 .shutdown = tipc_shutdown,
1963 .setsockopt = tipc_setsockopt,
1964 .getsockopt = tipc_getsockopt,
1965 .sendmsg = tipc_send_packet,
1966 .recvmsg = tipc_recvmsg,
1967 .mmap = sock_no_mmap,
1968 .sendpage = sock_no_sendpage
1971 static const struct proto_ops stream_ops = {
1972 .owner = THIS_MODULE,
1974 .release = tipc_release,
1976 .connect = tipc_connect,
1977 .socketpair = sock_no_socketpair,
1978 .accept = tipc_accept,
1979 .getname = tipc_getname,
1981 .ioctl = sock_no_ioctl,
1982 .listen = tipc_listen,
1983 .shutdown = tipc_shutdown,
1984 .setsockopt = tipc_setsockopt,
1985 .getsockopt = tipc_getsockopt,
1986 .sendmsg = tipc_send_stream,
1987 .recvmsg = tipc_recv_stream,
1988 .mmap = sock_no_mmap,
1989 .sendpage = sock_no_sendpage
1992 static const struct net_proto_family tipc_family_ops = {
1993 .owner = THIS_MODULE,
1995 .create = tipc_sk_create
1998 static struct proto tipc_proto = {
2000 .owner = THIS_MODULE,
2001 .obj_size = sizeof(struct tipc_sock),
2002 .sysctl_rmem = sysctl_tipc_rmem
2005 static struct proto tipc_proto_kern = {
2007 .obj_size = sizeof(struct tipc_sock),
2008 .sysctl_rmem = sysctl_tipc_rmem
2012 * tipc_socket_init - initialize TIPC socket interface
2014 * Returns 0 on success, errno otherwise
2016 int tipc_socket_init(void)
2020 res = proto_register(&tipc_proto, 1);
2022 pr_err("Failed to register TIPC protocol type\n");
2026 res = sock_register(&tipc_family_ops);
2028 pr_err("Failed to register TIPC socket type\n");
2029 proto_unregister(&tipc_proto);
2033 sockets_enabled = 1;
2039 * tipc_socket_stop - stop TIPC socket interface
2041 void tipc_socket_stop(void)
2043 if (!sockets_enabled)
2046 sockets_enabled = 0;
2047 sock_unregister(tipc_family_ops.family);
2048 proto_unregister(&tipc_proto);