2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2004-2008, 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
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
37 #include <linux/module.h>
38 #include <linux/types.h>
39 #include <linux/net.h>
40 #include <linux/socket.h>
41 #include <linux/errno.h>
43 #include <linux/slab.h>
44 #include <linux/poll.h>
45 #include <linux/fcntl.h>
46 #include <asm/string.h>
47 #include <asm/atomic.h>
50 #include <linux/tipc.h>
51 #include <linux/tipc_config.h>
52 #include <net/tipc/tipc_msg.h>
53 #include <net/tipc/tipc_port.h>
57 #define SS_LISTENING -1 /* socket is listening */
58 #define SS_READY -2 /* socket is connectionless */
60 #define OVERLOAD_LIMIT_BASE 5000
61 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
68 #define tipc_sk(sk) ((struct tipc_sock *)(sk))
69 #define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p))
71 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
72 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
);
73 static void wakeupdispatch(struct tipc_port
*tport
);
75 static const struct proto_ops packet_ops
;
76 static const struct proto_ops stream_ops
;
77 static const struct proto_ops msg_ops
;
79 static struct proto tipc_proto
;
81 static int sockets_enabled
= 0;
83 static atomic_t tipc_queue_size
= ATOMIC_INIT(0);
86 * Revised TIPC socket locking policy:
88 * Most socket operations take the standard socket lock when they start
89 * and hold it until they finish (or until they need to sleep). Acquiring
90 * this lock grants the owner exclusive access to the fields of the socket
91 * data structures, with the exception of the backlog queue. A few socket
92 * operations can be done without taking the socket lock because they only
93 * read socket information that never changes during the life of the socket.
95 * Socket operations may acquire the lock for the associated TIPC port if they
96 * need to perform an operation on the port. If any routine needs to acquire
97 * both the socket lock and the port lock it must take the socket lock first
98 * to avoid the risk of deadlock.
100 * The dispatcher handling incoming messages cannot grab the socket lock in
101 * the standard fashion, since invoked it runs at the BH level and cannot block.
102 * Instead, it checks to see if the socket lock is currently owned by someone,
103 * and either handles the message itself or adds it to the socket's backlog
104 * queue; in the latter case the queued message is processed once the process
105 * owning the socket lock releases it.
107 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
108 * the problem of a blocked socket operation preventing any other operations
109 * from occurring. However, applications must be careful if they have
110 * multiple threads trying to send (or receive) on the same socket, as these
111 * operations might interfere with each other. For example, doing a connect
112 * and a receive at the same time might allow the receive to consume the
113 * ACK message meant for the connect. While additional work could be done
114 * to try and overcome this, it doesn't seem to be worthwhile at the present.
116 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
117 * that another operation that must be performed in a non-blocking manner is
118 * not delayed for very long because the lock has already been taken.
120 * NOTE: This code assumes that certain fields of a port/socket pair are
121 * constant over its lifetime; such fields can be examined without taking
122 * the socket lock and/or port lock, and do not need to be re-read even
123 * after resuming processing after waiting. These fields include:
125 * - pointer to socket sk structure (aka tipc_sock structure)
126 * - pointer to port structure
131 * advance_rx_queue - discard first buffer in socket receive queue
133 * Caller must hold socket lock
136 static void advance_rx_queue(struct sock
*sk
)
138 buf_discard(__skb_dequeue(&sk
->sk_receive_queue
));
139 atomic_dec(&tipc_queue_size
);
143 * discard_rx_queue - discard all buffers in socket receive queue
145 * Caller must hold socket lock
148 static void discard_rx_queue(struct sock
*sk
)
152 while ((buf
= __skb_dequeue(&sk
->sk_receive_queue
))) {
153 atomic_dec(&tipc_queue_size
);
159 * reject_rx_queue - reject all buffers in socket receive queue
161 * Caller must hold socket lock
164 static void reject_rx_queue(struct sock
*sk
)
168 while ((buf
= __skb_dequeue(&sk
->sk_receive_queue
))) {
169 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
170 atomic_dec(&tipc_queue_size
);
175 * tipc_create - create a TIPC socket
176 * @net: network namespace (must be default network)
177 * @sock: pre-allocated socket structure
178 * @protocol: protocol indicator (must be 0)
180 * This routine creates additional data structures used by the TIPC socket,
181 * initializes them, and links them together.
183 * Returns 0 on success, errno otherwise
186 static int tipc_create(struct net
*net
, struct socket
*sock
, int protocol
)
188 const struct proto_ops
*ops
;
191 struct tipc_port
*tp_ptr
;
193 /* Validate arguments */
195 if (net
!= &init_net
)
196 return -EAFNOSUPPORT
;
198 if (unlikely(protocol
!= 0))
199 return -EPROTONOSUPPORT
;
201 switch (sock
->type
) {
204 state
= SS_UNCONNECTED
;
208 state
= SS_UNCONNECTED
;
219 /* Allocate socket's protocol area */
221 sk
= sk_alloc(net
, AF_TIPC
, GFP_KERNEL
, &tipc_proto
);
225 /* Allocate TIPC port for socket to use */
227 tp_ptr
= tipc_createport_raw(sk
, &dispatch
, &wakeupdispatch
,
228 TIPC_LOW_IMPORTANCE
);
229 if (unlikely(!tp_ptr
)) {
234 /* Finish initializing socket data structures */
239 sock_init_data(sock
, sk
);
240 sk
->sk_rcvtimeo
= msecs_to_jiffies(CONN_TIMEOUT_DEFAULT
);
241 sk
->sk_backlog_rcv
= backlog_rcv
;
242 tipc_sk(sk
)->p
= tp_ptr
;
244 spin_unlock_bh(tp_ptr
->lock
);
246 if (sock
->state
== SS_READY
) {
247 tipc_set_portunreturnable(tp_ptr
->ref
, 1);
248 if (sock
->type
== SOCK_DGRAM
)
249 tipc_set_portunreliable(tp_ptr
->ref
, 1);
252 atomic_inc(&tipc_user_count
);
257 * release - destroy a TIPC socket
258 * @sock: socket to destroy
260 * This routine cleans up any messages that are still queued on the socket.
261 * For DGRAM and RDM socket types, all queued messages are rejected.
262 * For SEQPACKET and STREAM socket types, the first message is rejected
263 * and any others are discarded. (If the first message on a STREAM socket
264 * is partially-read, it is discarded and the next one is rejected instead.)
266 * NOTE: Rejected messages are not necessarily returned to the sender! They
267 * are returned or discarded according to the "destination droppable" setting
268 * specified for the message by the sender.
270 * Returns 0 on success, errno otherwise
273 static int release(struct socket
*sock
)
275 struct sock
*sk
= sock
->sk
;
276 struct tipc_port
*tport
;
281 * Exit if socket isn't fully initialized (occurs when a failed accept()
282 * releases a pre-allocated child socket that was never used)
288 tport
= tipc_sk_port(sk
);
292 * Reject all unreceived messages, except on an active connection
293 * (which disconnects locally & sends a 'FIN+' to peer)
296 while (sock
->state
!= SS_DISCONNECTING
) {
297 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
300 atomic_dec(&tipc_queue_size
);
301 if (TIPC_SKB_CB(buf
)->handle
!= msg_data(buf_msg(buf
)))
304 if ((sock
->state
== SS_CONNECTING
) ||
305 (sock
->state
== SS_CONNECTED
)) {
306 sock
->state
= SS_DISCONNECTING
;
307 tipc_disconnect(tport
->ref
);
309 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
314 * Delete TIPC port; this ensures no more messages are queued
315 * (also disconnects an active connection & sends a 'FIN-' to peer)
318 res
= tipc_deleteport(tport
->ref
);
320 /* Discard any remaining (connection-based) messages in receive queue */
322 discard_rx_queue(sk
);
324 /* Reject any messages that accumulated in backlog queue */
326 sock
->state
= SS_DISCONNECTING
;
332 atomic_dec(&tipc_user_count
);
337 * bind - associate or disassocate TIPC name(s) with a socket
338 * @sock: socket structure
339 * @uaddr: socket address describing name(s) and desired operation
340 * @uaddr_len: size of socket address data structure
342 * Name and name sequence binding is indicated using a positive scope value;
343 * a negative scope value unbinds the specified name. Specifying no name
344 * (i.e. a socket address length of 0) unbinds all names from the socket.
346 * Returns 0 on success, errno otherwise
348 * NOTE: This routine doesn't need to take the socket lock since it doesn't
349 * access any non-constant socket information.
352 static int bind(struct socket
*sock
, struct sockaddr
*uaddr
, int uaddr_len
)
354 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
355 u32 portref
= tipc_sk_port(sock
->sk
)->ref
;
357 if (unlikely(!uaddr_len
))
358 return tipc_withdraw(portref
, 0, NULL
);
360 if (uaddr_len
< sizeof(struct sockaddr_tipc
))
362 if (addr
->family
!= AF_TIPC
)
363 return -EAFNOSUPPORT
;
365 if (addr
->addrtype
== TIPC_ADDR_NAME
)
366 addr
->addr
.nameseq
.upper
= addr
->addr
.nameseq
.lower
;
367 else if (addr
->addrtype
!= TIPC_ADDR_NAMESEQ
)
368 return -EAFNOSUPPORT
;
370 return (addr
->scope
> 0) ?
371 tipc_publish(portref
, addr
->scope
, &addr
->addr
.nameseq
) :
372 tipc_withdraw(portref
, -addr
->scope
, &addr
->addr
.nameseq
);
376 * get_name - get port ID of socket or peer socket
377 * @sock: socket structure
378 * @uaddr: area for returned socket address
379 * @uaddr_len: area for returned length of socket address
380 * @peer: 0 to obtain socket name, 1 to obtain peer socket name
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.
388 static int get_name(struct socket
*sock
, struct sockaddr
*uaddr
,
389 int *uaddr_len
, int peer
)
391 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
392 u32 portref
= tipc_sk_port(sock
->sk
)->ref
;
396 res
= tipc_peer(portref
, &addr
->addr
.id
);
400 tipc_ownidentity(portref
, &addr
->addr
.id
);
403 *uaddr_len
= sizeof(*addr
);
404 addr
->addrtype
= TIPC_ADDR_ID
;
405 addr
->family
= AF_TIPC
;
407 addr
->addr
.name
.domain
= 0;
413 * poll - read and possibly block on pollmask
414 * @file: file structure associated with the socket
415 * @sock: socket for which to calculate the poll bits
418 * Returns pollmask value
421 * It appears that the usual socket locking mechanisms are not useful here
422 * since the pollmask info is potentially out-of-date the moment this routine
423 * exits. TCP and other protocols seem to rely on higher level poll routines
424 * to handle any preventable race conditions, so TIPC will do the same ...
426 * TIPC sets the returned events as follows:
427 * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty
428 * or if a connection-oriented socket is does not have an active connection
429 * (i.e. a read operation will not block).
430 * b) POLLOUT is set except when a socket's connection has been terminated
431 * (i.e. a write operation will not block).
432 * c) POLLHUP is set when a socket's connection has been terminated.
434 * IMPORTANT: The fact that a read or write operation will not block does NOT
435 * imply that the operation will succeed!
438 static unsigned int poll(struct file
*file
, struct socket
*sock
,
441 struct sock
*sk
= sock
->sk
;
444 poll_wait(file
, sk
->sk_sleep
, wait
);
446 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
447 (sock
->state
== SS_UNCONNECTED
) ||
448 (sock
->state
== SS_DISCONNECTING
))
449 mask
= (POLLRDNORM
| POLLIN
);
453 if (sock
->state
== SS_DISCONNECTING
)
462 * dest_name_check - verify user is permitted to send to specified port name
463 * @dest: destination address
464 * @m: descriptor for message to be sent
466 * Prevents restricted configuration commands from being issued by
467 * unauthorized users.
469 * Returns 0 if permission is granted, otherwise errno
472 static int dest_name_check(struct sockaddr_tipc
*dest
, struct msghdr
*m
)
474 struct tipc_cfg_msg_hdr hdr
;
476 if (likely(dest
->addr
.name
.name
.type
>= TIPC_RESERVED_TYPES
))
478 if (likely(dest
->addr
.name
.name
.type
== TIPC_TOP_SRV
))
480 if (likely(dest
->addr
.name
.name
.type
!= TIPC_CFG_SRV
))
483 if (copy_from_user(&hdr
, m
->msg_iov
[0].iov_base
, sizeof(hdr
)))
485 if ((ntohs(hdr
.tcm_type
) & 0xC000) && (!capable(CAP_NET_ADMIN
)))
492 * send_msg - send message in connectionless manner
493 * @iocb: if NULL, indicates that socket lock is already held
494 * @sock: socket structure
495 * @m: message to send
496 * @total_len: length of message
498 * Message must have an destination specified explicitly.
499 * Used for SOCK_RDM and SOCK_DGRAM messages,
500 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
501 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
503 * Returns the number of bytes sent on success, or errno otherwise
506 static int send_msg(struct kiocb
*iocb
, struct socket
*sock
,
507 struct msghdr
*m
, size_t total_len
)
509 struct sock
*sk
= sock
->sk
;
510 struct tipc_port
*tport
= tipc_sk_port(sk
);
511 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
516 return -EDESTADDRREQ
;
517 if (unlikely((m
->msg_namelen
< sizeof(*dest
)) ||
518 (dest
->family
!= AF_TIPC
)))
524 needs_conn
= (sock
->state
!= SS_READY
);
525 if (unlikely(needs_conn
)) {
526 if (sock
->state
== SS_LISTENING
) {
530 if (sock
->state
!= SS_UNCONNECTED
) {
534 if ((tport
->published
) ||
535 ((sock
->type
== SOCK_STREAM
) && (total_len
!= 0))) {
539 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
540 tport
->conn_type
= dest
->addr
.name
.name
.type
;
541 tport
->conn_instance
= dest
->addr
.name
.name
.instance
;
544 /* Abort any pending connection attempts (very unlikely) */
550 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
551 if ((res
= dest_name_check(dest
, m
)))
553 res
= tipc_send2name(tport
->ref
,
554 &dest
->addr
.name
.name
,
555 dest
->addr
.name
.domain
,
559 else if (dest
->addrtype
== TIPC_ADDR_ID
) {
560 res
= tipc_send2port(tport
->ref
,
565 else if (dest
->addrtype
== TIPC_ADDR_MCAST
) {
570 if ((res
= dest_name_check(dest
, m
)))
572 res
= tipc_multicast(tport
->ref
,
578 if (likely(res
!= -ELINKCONG
)) {
579 if (needs_conn
&& (res
>= 0)) {
580 sock
->state
= SS_CONNECTING
;
584 if (m
->msg_flags
& MSG_DONTWAIT
) {
589 res
= wait_event_interruptible(*sk
->sk_sleep
,
603 * send_packet - send a connection-oriented message
604 * @iocb: if NULL, indicates that socket lock is already held
605 * @sock: socket structure
606 * @m: message to send
607 * @total_len: length of message
609 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
611 * Returns the number of bytes sent on success, or errno otherwise
614 static int send_packet(struct kiocb
*iocb
, struct socket
*sock
,
615 struct msghdr
*m
, size_t total_len
)
617 struct sock
*sk
= sock
->sk
;
618 struct tipc_port
*tport
= tipc_sk_port(sk
);
619 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
622 /* Handle implied connection establishment */
625 return send_msg(iocb
, sock
, m
, total_len
);
631 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
632 if (sock
->state
== SS_DISCONNECTING
)
639 res
= tipc_send(tport
->ref
, m
->msg_iovlen
, m
->msg_iov
);
640 if (likely(res
!= -ELINKCONG
)) {
643 if (m
->msg_flags
& MSG_DONTWAIT
) {
648 res
= wait_event_interruptible(*sk
->sk_sleep
,
649 (!tport
->congested
|| !tport
->connected
));
661 * send_stream - send stream-oriented data
663 * @sock: socket structure
665 * @total_len: total length of data to be sent
667 * Used for SOCK_STREAM data.
669 * Returns the number of bytes sent on success (or partial success),
670 * or errno if no data sent
673 static int send_stream(struct kiocb
*iocb
, struct socket
*sock
,
674 struct msghdr
*m
, size_t total_len
)
676 struct sock
*sk
= sock
->sk
;
677 struct tipc_port
*tport
= tipc_sk_port(sk
);
678 struct msghdr my_msg
;
680 struct iovec
*curr_iov
;
682 char __user
*curr_start
;
691 /* Handle special cases where there is no connection */
693 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
694 if (sock
->state
== SS_UNCONNECTED
) {
695 res
= send_packet(NULL
, sock
, m
, total_len
);
697 } else if (sock
->state
== SS_DISCONNECTING
) {
706 if (unlikely(m
->msg_name
)) {
712 * Send each iovec entry using one or more messages
714 * Note: This algorithm is good for the most likely case
715 * (i.e. one large iovec entry), but could be improved to pass sets
716 * of small iovec entries into send_packet().
719 curr_iov
= m
->msg_iov
;
720 curr_iovlen
= m
->msg_iovlen
;
721 my_msg
.msg_iov
= &my_iov
;
722 my_msg
.msg_iovlen
= 1;
723 my_msg
.msg_flags
= m
->msg_flags
;
724 my_msg
.msg_name
= NULL
;
727 hdr_size
= msg_hdr_sz(&tport
->phdr
);
729 while (curr_iovlen
--) {
730 curr_start
= curr_iov
->iov_base
;
731 curr_left
= curr_iov
->iov_len
;
734 bytes_to_send
= tport
->max_pkt
- hdr_size
;
735 if (bytes_to_send
> TIPC_MAX_USER_MSG_SIZE
)
736 bytes_to_send
= TIPC_MAX_USER_MSG_SIZE
;
737 if (curr_left
< bytes_to_send
)
738 bytes_to_send
= curr_left
;
739 my_iov
.iov_base
= curr_start
;
740 my_iov
.iov_len
= bytes_to_send
;
741 if ((res
= send_packet(NULL
, sock
, &my_msg
, 0)) < 0) {
746 curr_left
-= bytes_to_send
;
747 curr_start
+= bytes_to_send
;
748 bytes_sent
+= bytes_to_send
;
760 * auto_connect - complete connection setup to a remote port
761 * @sock: socket structure
762 * @msg: peer's response message
764 * Returns 0 on success, errno otherwise
767 static int auto_connect(struct socket
*sock
, struct tipc_msg
*msg
)
769 struct tipc_port
*tport
= tipc_sk_port(sock
->sk
);
770 struct tipc_portid peer
;
772 if (msg_errcode(msg
)) {
773 sock
->state
= SS_DISCONNECTING
;
774 return -ECONNREFUSED
;
777 peer
.ref
= msg_origport(msg
);
778 peer
.node
= msg_orignode(msg
);
779 tipc_connect2port(tport
->ref
, &peer
);
780 tipc_set_portimportance(tport
->ref
, msg_importance(msg
));
781 sock
->state
= SS_CONNECTED
;
786 * set_orig_addr - capture sender's address for received message
787 * @m: descriptor for message info
788 * @msg: received message header
790 * Note: Address is not captured if not requested by receiver.
793 static void set_orig_addr(struct msghdr
*m
, struct tipc_msg
*msg
)
795 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)m
->msg_name
;
798 addr
->family
= AF_TIPC
;
799 addr
->addrtype
= TIPC_ADDR_ID
;
800 addr
->addr
.id
.ref
= msg_origport(msg
);
801 addr
->addr
.id
.node
= msg_orignode(msg
);
802 addr
->addr
.name
.domain
= 0; /* could leave uninitialized */
803 addr
->scope
= 0; /* could leave uninitialized */
804 m
->msg_namelen
= sizeof(struct sockaddr_tipc
);
809 * anc_data_recv - optionally capture ancillary data for received message
810 * @m: descriptor for message info
811 * @msg: received message header
812 * @tport: TIPC port associated with message
814 * Note: Ancillary data is not captured if not requested by receiver.
816 * Returns 0 if successful, otherwise errno
819 static int anc_data_recv(struct msghdr
*m
, struct tipc_msg
*msg
,
820 struct tipc_port
*tport
)
828 if (likely(m
->msg_controllen
== 0))
831 /* Optionally capture errored message object(s) */
833 err
= msg
? msg_errcode(msg
) : 0;
836 anc_data
[1] = msg_data_sz(msg
);
837 if ((res
= put_cmsg(m
, SOL_TIPC
, TIPC_ERRINFO
, 8, anc_data
)))
840 (res
= put_cmsg(m
, SOL_TIPC
, TIPC_RETDATA
, anc_data
[1],
845 /* Optionally capture message destination object */
847 dest_type
= msg
? msg_type(msg
) : TIPC_DIRECT_MSG
;
851 anc_data
[0] = msg_nametype(msg
);
852 anc_data
[1] = msg_namelower(msg
);
853 anc_data
[2] = msg_namelower(msg
);
857 anc_data
[0] = msg_nametype(msg
);
858 anc_data
[1] = msg_namelower(msg
);
859 anc_data
[2] = msg_nameupper(msg
);
862 has_name
= (tport
->conn_type
!= 0);
863 anc_data
[0] = tport
->conn_type
;
864 anc_data
[1] = tport
->conn_instance
;
865 anc_data
[2] = tport
->conn_instance
;
871 (res
= put_cmsg(m
, SOL_TIPC
, TIPC_DESTNAME
, 12, anc_data
)))
878 * recv_msg - receive packet-oriented message
880 * @m: descriptor for message info
881 * @buf_len: total size of user buffer area
882 * @flags: receive flags
884 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
885 * If the complete message doesn't fit in user area, truncate it.
887 * Returns size of returned message data, errno otherwise
890 static int recv_msg(struct kiocb
*iocb
, struct socket
*sock
,
891 struct msghdr
*m
, size_t buf_len
, int flags
)
893 struct sock
*sk
= sock
->sk
;
894 struct tipc_port
*tport
= tipc_sk_port(sk
);
896 struct tipc_msg
*msg
;
901 /* Catch invalid receive requests */
903 if (m
->msg_iovlen
!= 1)
904 return -EOPNOTSUPP
; /* Don't do multiple iovec entries yet */
906 if (unlikely(!buf_len
))
911 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
918 /* Look for a message in receive queue; wait if necessary */
920 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
921 if (sock
->state
== SS_DISCONNECTING
) {
925 if (flags
& MSG_DONTWAIT
) {
930 res
= wait_event_interruptible(*sk
->sk_sleep
,
931 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
932 (sock
->state
== SS_DISCONNECTING
)));
938 /* Look at first message in receive queue */
940 buf
= skb_peek(&sk
->sk_receive_queue
);
942 sz
= msg_data_sz(msg
);
943 err
= msg_errcode(msg
);
945 /* Complete connection setup for an implied connect */
947 if (unlikely(sock
->state
== SS_CONNECTING
)) {
948 res
= auto_connect(sock
, msg
);
953 /* Discard an empty non-errored message & try again */
955 if ((!sz
) && (!err
)) {
956 advance_rx_queue(sk
);
960 /* Capture sender's address (optional) */
962 set_orig_addr(m
, msg
);
964 /* Capture ancillary data (optional) */
966 res
= anc_data_recv(m
, msg
, tport
);
970 /* Capture message data (if valid) & compute return value (always) */
973 if (unlikely(buf_len
< sz
)) {
975 m
->msg_flags
|= MSG_TRUNC
;
977 if (unlikely(copy_to_user(m
->msg_iov
->iov_base
, msg_data(msg
),
984 if ((sock
->state
== SS_READY
) ||
985 ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
))
991 /* Consume received message (optional) */
993 if (likely(!(flags
& MSG_PEEK
))) {
994 if ((sock
->state
!= SS_READY
) &&
995 (++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
996 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
997 advance_rx_queue(sk
);
1005 * recv_stream - receive stream-oriented data
1007 * @m: descriptor for message info
1008 * @buf_len: total size of user buffer area
1009 * @flags: receive flags
1011 * Used for SOCK_STREAM messages only. If not enough data is available
1012 * will optionally wait for more; never truncates data.
1014 * Returns size of returned message data, errno otherwise
1017 static int recv_stream(struct kiocb
*iocb
, struct socket
*sock
,
1018 struct msghdr
*m
, size_t buf_len
, int flags
)
1020 struct sock
*sk
= sock
->sk
;
1021 struct tipc_port
*tport
= tipc_sk_port(sk
);
1022 struct sk_buff
*buf
;
1023 struct tipc_msg
*msg
;
1028 char __user
*crs
= m
->msg_iov
->iov_base
;
1029 unsigned char *buf_crs
;
1033 /* Catch invalid receive attempts */
1035 if (m
->msg_iovlen
!= 1)
1036 return -EOPNOTSUPP
; /* Don't do multiple iovec entries yet */
1038 if (unlikely(!buf_len
))
1043 if (unlikely((sock
->state
== SS_UNCONNECTED
) ||
1044 (sock
->state
== SS_CONNECTING
))) {
1051 /* Look for a message in receive queue; wait if necessary */
1053 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1054 if (sock
->state
== SS_DISCONNECTING
) {
1058 if (flags
& MSG_DONTWAIT
) {
1063 res
= wait_event_interruptible(*sk
->sk_sleep
,
1064 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1065 (sock
->state
== SS_DISCONNECTING
)));
1071 /* Look at first message in receive queue */
1073 buf
= skb_peek(&sk
->sk_receive_queue
);
1075 sz
= msg_data_sz(msg
);
1076 err
= msg_errcode(msg
);
1078 /* Discard an empty non-errored message & try again */
1080 if ((!sz
) && (!err
)) {
1081 advance_rx_queue(sk
);
1085 /* Optionally capture sender's address & ancillary data of first msg */
1087 if (sz_copied
== 0) {
1088 set_orig_addr(m
, msg
);
1089 res
= anc_data_recv(m
, msg
, tport
);
1094 /* Capture message data (if valid) & compute return value (always) */
1097 buf_crs
= (unsigned char *)(TIPC_SKB_CB(buf
)->handle
);
1098 sz
= (unsigned char *)msg
+ msg_size(msg
) - buf_crs
;
1100 needed
= (buf_len
- sz_copied
);
1101 sz_to_copy
= (sz
<= needed
) ? sz
: needed
;
1102 if (unlikely(copy_to_user(crs
, buf_crs
, sz_to_copy
))) {
1106 sz_copied
+= sz_to_copy
;
1108 if (sz_to_copy
< sz
) {
1109 if (!(flags
& MSG_PEEK
))
1110 TIPC_SKB_CB(buf
)->handle
= buf_crs
+ sz_to_copy
;
1117 goto exit
; /* can't add error msg to valid data */
1119 if ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
)
1125 /* Consume received message (optional) */
1127 if (likely(!(flags
& MSG_PEEK
))) {
1128 if (unlikely(++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
1129 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
1130 advance_rx_queue(sk
);
1133 /* Loop around if more data is required */
1135 if ((sz_copied
< buf_len
) /* didn't get all requested data */
1136 && (!skb_queue_empty(&sock
->sk
->sk_receive_queue
) ||
1137 (flags
& MSG_WAITALL
))
1138 /* ... and more is ready or required */
1139 && (!(flags
& MSG_PEEK
)) /* ... and aren't just peeking at data */
1140 && (!err
) /* ... and haven't reached a FIN */
1146 return sz_copied
? sz_copied
: res
;
1150 * rx_queue_full - determine if receive queue can accept another message
1151 * @msg: message to be added to queue
1152 * @queue_size: current size of queue
1153 * @base: nominal maximum size of queue
1155 * Returns 1 if queue is unable to accept message, 0 otherwise
1158 static int rx_queue_full(struct tipc_msg
*msg
, u32 queue_size
, u32 base
)
1161 u32 imp
= msg_importance(msg
);
1163 if (imp
== TIPC_LOW_IMPORTANCE
)
1165 else if (imp
== TIPC_MEDIUM_IMPORTANCE
)
1166 threshold
= base
* 2;
1167 else if (imp
== TIPC_HIGH_IMPORTANCE
)
1168 threshold
= base
* 100;
1172 if (msg_connected(msg
))
1175 return (queue_size
>= threshold
);
1179 * filter_rcv - validate incoming message
1183 * Enqueues message on receive queue if acceptable; optionally handles
1184 * disconnect indication for a connected socket.
1186 * Called with socket lock already taken; port lock may also be taken.
1188 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1191 static u32
filter_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1193 struct socket
*sock
= sk
->sk_socket
;
1194 struct tipc_msg
*msg
= buf_msg(buf
);
1197 /* Reject message if it is wrong sort of message for socket */
1200 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
1201 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
1202 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
1205 if (sock
->state
== SS_READY
) {
1206 if (msg_connected(msg
)) {
1207 msg_dbg(msg
, "dispatch filter 1\n");
1208 return TIPC_ERR_NO_PORT
;
1211 if (msg_mcast(msg
)) {
1212 msg_dbg(msg
, "dispatch filter 2\n");
1213 return TIPC_ERR_NO_PORT
;
1215 if (sock
->state
== SS_CONNECTED
) {
1216 if (!msg_connected(msg
)) {
1217 msg_dbg(msg
, "dispatch filter 3\n");
1218 return TIPC_ERR_NO_PORT
;
1221 else if (sock
->state
== SS_CONNECTING
) {
1222 if (!msg_connected(msg
) && (msg_errcode(msg
) == 0)) {
1223 msg_dbg(msg
, "dispatch filter 4\n");
1224 return TIPC_ERR_NO_PORT
;
1227 else if (sock
->state
== SS_LISTENING
) {
1228 if (msg_connected(msg
) || msg_errcode(msg
)) {
1229 msg_dbg(msg
, "dispatch filter 5\n");
1230 return TIPC_ERR_NO_PORT
;
1233 else if (sock
->state
== SS_DISCONNECTING
) {
1234 msg_dbg(msg
, "dispatch filter 6\n");
1235 return TIPC_ERR_NO_PORT
;
1237 else /* (sock->state == SS_UNCONNECTED) */ {
1238 if (msg_connected(msg
) || msg_errcode(msg
)) {
1239 msg_dbg(msg
, "dispatch filter 7\n");
1240 return TIPC_ERR_NO_PORT
;
1245 /* Reject message if there isn't room to queue it */
1247 recv_q_len
= (u32
)atomic_read(&tipc_queue_size
);
1248 if (unlikely(recv_q_len
>= OVERLOAD_LIMIT_BASE
)) {
1249 if (rx_queue_full(msg
, recv_q_len
, OVERLOAD_LIMIT_BASE
))
1250 return TIPC_ERR_OVERLOAD
;
1252 recv_q_len
= skb_queue_len(&sk
->sk_receive_queue
);
1253 if (unlikely(recv_q_len
>= (OVERLOAD_LIMIT_BASE
/ 2))) {
1254 if (rx_queue_full(msg
, recv_q_len
, OVERLOAD_LIMIT_BASE
/ 2))
1255 return TIPC_ERR_OVERLOAD
;
1258 /* Enqueue message (finally!) */
1260 msg_dbg(msg
, "<DISP<: ");
1261 TIPC_SKB_CB(buf
)->handle
= msg_data(msg
);
1262 atomic_inc(&tipc_queue_size
);
1263 __skb_queue_tail(&sk
->sk_receive_queue
, buf
);
1265 /* Initiate connection termination for an incoming 'FIN' */
1267 if (unlikely(msg_errcode(msg
) && (sock
->state
== SS_CONNECTED
))) {
1268 sock
->state
= SS_DISCONNECTING
;
1269 tipc_disconnect_port(tipc_sk_port(sk
));
1272 if (waitqueue_active(sk
->sk_sleep
))
1273 wake_up_interruptible(sk
->sk_sleep
);
1278 * backlog_rcv - handle incoming message from backlog queue
1282 * Caller must hold socket lock, but not port lock.
1287 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1291 res
= filter_rcv(sk
, buf
);
1293 tipc_reject_msg(buf
, res
);
1298 * dispatch - handle incoming message
1299 * @tport: TIPC port that received message
1302 * Called with port lock already taken.
1304 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1307 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
)
1309 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1313 * Process message if socket is unlocked; otherwise add to backlog queue
1315 * This code is based on sk_receive_skb(), but must be distinct from it
1316 * since a TIPC-specific filter/reject mechanism is utilized
1320 if (!sock_owned_by_user(sk
)) {
1321 res
= filter_rcv(sk
, buf
);
1323 sk_add_backlog(sk
, buf
);
1332 * wakeupdispatch - wake up port after congestion
1333 * @tport: port to wakeup
1335 * Called with port lock already taken.
1338 static void wakeupdispatch(struct tipc_port
*tport
)
1340 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1342 if (waitqueue_active(sk
->sk_sleep
))
1343 wake_up_interruptible(sk
->sk_sleep
);
1347 * connect - establish a connection to another TIPC port
1348 * @sock: socket structure
1349 * @dest: socket address for destination port
1350 * @destlen: size of socket address data structure
1351 * @flags: file-related flags associated with socket
1353 * Returns 0 on success, errno otherwise
1356 static int connect(struct socket
*sock
, struct sockaddr
*dest
, int destlen
,
1359 struct sock
*sk
= sock
->sk
;
1360 struct sockaddr_tipc
*dst
= (struct sockaddr_tipc
*)dest
;
1361 struct msghdr m
= {NULL
,};
1362 struct sk_buff
*buf
;
1363 struct tipc_msg
*msg
;
1368 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1370 if (sock
->state
== SS_READY
) {
1375 /* For now, TIPC does not support the non-blocking form of connect() */
1377 if (flags
& O_NONBLOCK
) {
1382 /* Issue Posix-compliant error code if socket is in the wrong state */
1384 if (sock
->state
== SS_LISTENING
) {
1388 if (sock
->state
== SS_CONNECTING
) {
1392 if (sock
->state
!= SS_UNCONNECTED
) {
1398 * Reject connection attempt using multicast address
1400 * Note: send_msg() validates the rest of the address fields,
1401 * so there's no need to do it here
1404 if (dst
->addrtype
== TIPC_ADDR_MCAST
) {
1409 /* Reject any messages already in receive queue (very unlikely) */
1411 reject_rx_queue(sk
);
1413 /* Send a 'SYN-' to destination */
1416 m
.msg_namelen
= destlen
;
1417 res
= send_msg(NULL
, sock
, &m
, 0);
1422 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1425 res
= wait_event_interruptible_timeout(*sk
->sk_sleep
,
1426 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1427 (sock
->state
!= SS_CONNECTING
)),
1432 buf
= skb_peek(&sk
->sk_receive_queue
);
1435 res
= auto_connect(sock
, msg
);
1437 if (!msg_data_sz(msg
))
1438 advance_rx_queue(sk
);
1441 if (sock
->state
== SS_CONNECTED
) {
1444 res
= -ECONNREFUSED
;
1451 ; /* leave "res" unchanged */
1452 sock
->state
= SS_DISCONNECTING
;
1461 * listen - allow socket to listen for incoming connections
1462 * @sock: socket structure
1465 * Returns 0 on success, errno otherwise
1468 static int listen(struct socket
*sock
, int len
)
1470 struct sock
*sk
= sock
->sk
;
1475 if (sock
->state
== SS_READY
)
1477 else if (sock
->state
!= SS_UNCONNECTED
)
1480 sock
->state
= SS_LISTENING
;
1489 * accept - wait for connection request
1490 * @sock: listening socket
1491 * @newsock: new socket that is to be connected
1492 * @flags: file-related flags associated with socket
1494 * Returns 0 on success, errno otherwise
1497 static int accept(struct socket
*sock
, struct socket
*new_sock
, int flags
)
1499 struct sock
*sk
= sock
->sk
;
1500 struct sk_buff
*buf
;
1505 if (sock
->state
== SS_READY
) {
1509 if (sock
->state
!= SS_LISTENING
) {
1514 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1515 if (flags
& O_NONBLOCK
) {
1520 res
= wait_event_interruptible(*sk
->sk_sleep
,
1521 (!skb_queue_empty(&sk
->sk_receive_queue
)));
1527 buf
= skb_peek(&sk
->sk_receive_queue
);
1529 res
= tipc_create(sock_net(sock
->sk
), new_sock
, 0);
1531 struct sock
*new_sk
= new_sock
->sk
;
1532 struct tipc_port
*new_tport
= tipc_sk_port(new_sk
);
1533 u32 new_ref
= new_tport
->ref
;
1534 struct tipc_portid id
;
1535 struct tipc_msg
*msg
= buf_msg(buf
);
1540 * Reject any stray messages received by new socket
1541 * before the socket lock was taken (very, very unlikely)
1544 reject_rx_queue(new_sk
);
1546 /* Connect new socket to it's peer */
1548 id
.ref
= msg_origport(msg
);
1549 id
.node
= msg_orignode(msg
);
1550 tipc_connect2port(new_ref
, &id
);
1551 new_sock
->state
= SS_CONNECTED
;
1553 tipc_set_portimportance(new_ref
, msg_importance(msg
));
1554 if (msg_named(msg
)) {
1555 new_tport
->conn_type
= msg_nametype(msg
);
1556 new_tport
->conn_instance
= msg_nameinst(msg
);
1560 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1561 * Respond to 'SYN+' by queuing it on new socket.
1564 msg_dbg(msg
,"<ACC<: ");
1565 if (!msg_data_sz(msg
)) {
1566 struct msghdr m
= {NULL
,};
1568 advance_rx_queue(sk
);
1569 send_packet(NULL
, new_sock
, &m
, 0);
1571 __skb_dequeue(&sk
->sk_receive_queue
);
1572 __skb_queue_head(&new_sk
->sk_receive_queue
, buf
);
1574 release_sock(new_sk
);
1582 * shutdown - shutdown socket connection
1583 * @sock: socket structure
1584 * @how: direction to close (must be SHUT_RDWR)
1586 * Terminates connection (if necessary), then purges socket's receive queue.
1588 * Returns 0 on success, errno otherwise
1591 static int shutdown(struct socket
*sock
, int how
)
1593 struct sock
*sk
= sock
->sk
;
1594 struct tipc_port
*tport
= tipc_sk_port(sk
);
1595 struct sk_buff
*buf
;
1598 if (how
!= SHUT_RDWR
)
1603 switch (sock
->state
) {
1607 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1609 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
1611 atomic_dec(&tipc_queue_size
);
1612 if (TIPC_SKB_CB(buf
)->handle
!= msg_data(buf_msg(buf
))) {
1616 tipc_disconnect(tport
->ref
);
1617 tipc_reject_msg(buf
, TIPC_CONN_SHUTDOWN
);
1619 tipc_shutdown(tport
->ref
);
1622 sock
->state
= SS_DISCONNECTING
;
1626 case SS_DISCONNECTING
:
1628 /* Discard any unreceived messages; wake up sleeping tasks */
1630 discard_rx_queue(sk
);
1631 if (waitqueue_active(sk
->sk_sleep
))
1632 wake_up_interruptible(sk
->sk_sleep
);
1645 * setsockopt - set socket option
1646 * @sock: socket structure
1647 * @lvl: option level
1648 * @opt: option identifier
1649 * @ov: pointer to new option value
1650 * @ol: length of option value
1652 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1653 * (to ease compatibility).
1655 * Returns 0 on success, errno otherwise
1658 static int setsockopt(struct socket
*sock
,
1659 int lvl
, int opt
, char __user
*ov
, int ol
)
1661 struct sock
*sk
= sock
->sk
;
1662 struct tipc_port
*tport
= tipc_sk_port(sk
);
1666 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1668 if (lvl
!= SOL_TIPC
)
1669 return -ENOPROTOOPT
;
1670 if (ol
< sizeof(value
))
1672 if ((res
= get_user(value
, (u32 __user
*)ov
)))
1678 case TIPC_IMPORTANCE
:
1679 res
= tipc_set_portimportance(tport
->ref
, value
);
1681 case TIPC_SRC_DROPPABLE
:
1682 if (sock
->type
!= SOCK_STREAM
)
1683 res
= tipc_set_portunreliable(tport
->ref
, value
);
1687 case TIPC_DEST_DROPPABLE
:
1688 res
= tipc_set_portunreturnable(tport
->ref
, value
);
1690 case TIPC_CONN_TIMEOUT
:
1691 sk
->sk_rcvtimeo
= msecs_to_jiffies(value
);
1692 /* no need to set "res", since already 0 at this point */
1704 * getsockopt - get socket option
1705 * @sock: socket structure
1706 * @lvl: option level
1707 * @opt: option identifier
1708 * @ov: receptacle for option value
1709 * @ol: receptacle for length of option value
1711 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1712 * (to ease compatibility).
1714 * Returns 0 on success, errno otherwise
1717 static int getsockopt(struct socket
*sock
,
1718 int lvl
, int opt
, char __user
*ov
, int __user
*ol
)
1720 struct sock
*sk
= sock
->sk
;
1721 struct tipc_port
*tport
= tipc_sk_port(sk
);
1726 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1727 return put_user(0, ol
);
1728 if (lvl
!= SOL_TIPC
)
1729 return -ENOPROTOOPT
;
1730 if ((res
= get_user(len
, ol
)))
1736 case TIPC_IMPORTANCE
:
1737 res
= tipc_portimportance(tport
->ref
, &value
);
1739 case TIPC_SRC_DROPPABLE
:
1740 res
= tipc_portunreliable(tport
->ref
, &value
);
1742 case TIPC_DEST_DROPPABLE
:
1743 res
= tipc_portunreturnable(tport
->ref
, &value
);
1745 case TIPC_CONN_TIMEOUT
:
1746 value
= jiffies_to_msecs(sk
->sk_rcvtimeo
);
1747 /* no need to set "res", since already 0 at this point */
1758 else if (len
< sizeof(value
)) {
1761 else if (copy_to_user(ov
, &value
, sizeof(value
))) {
1765 res
= put_user(sizeof(value
), ol
);
1772 * Protocol switches for the various types of TIPC sockets
1775 static const struct proto_ops msg_ops
= {
1776 .owner
= THIS_MODULE
,
1781 .socketpair
= sock_no_socketpair
,
1783 .getname
= get_name
,
1785 .ioctl
= sock_no_ioctl
,
1787 .shutdown
= shutdown
,
1788 .setsockopt
= setsockopt
,
1789 .getsockopt
= getsockopt
,
1790 .sendmsg
= send_msg
,
1791 .recvmsg
= recv_msg
,
1792 .mmap
= sock_no_mmap
,
1793 .sendpage
= sock_no_sendpage
1796 static const struct proto_ops packet_ops
= {
1797 .owner
= THIS_MODULE
,
1802 .socketpair
= sock_no_socketpair
,
1804 .getname
= get_name
,
1806 .ioctl
= sock_no_ioctl
,
1808 .shutdown
= shutdown
,
1809 .setsockopt
= setsockopt
,
1810 .getsockopt
= getsockopt
,
1811 .sendmsg
= send_packet
,
1812 .recvmsg
= recv_msg
,
1813 .mmap
= sock_no_mmap
,
1814 .sendpage
= sock_no_sendpage
1817 static const struct proto_ops stream_ops
= {
1818 .owner
= THIS_MODULE
,
1823 .socketpair
= sock_no_socketpair
,
1825 .getname
= get_name
,
1827 .ioctl
= sock_no_ioctl
,
1829 .shutdown
= shutdown
,
1830 .setsockopt
= setsockopt
,
1831 .getsockopt
= getsockopt
,
1832 .sendmsg
= send_stream
,
1833 .recvmsg
= recv_stream
,
1834 .mmap
= sock_no_mmap
,
1835 .sendpage
= sock_no_sendpage
1838 static const struct net_proto_family tipc_family_ops
= {
1839 .owner
= THIS_MODULE
,
1841 .create
= tipc_create
1844 static struct proto tipc_proto
= {
1846 .owner
= THIS_MODULE
,
1847 .obj_size
= sizeof(struct tipc_sock
)
1851 * tipc_socket_init - initialize TIPC socket interface
1853 * Returns 0 on success, errno otherwise
1855 int tipc_socket_init(void)
1859 res
= proto_register(&tipc_proto
, 1);
1861 err("Failed to register TIPC protocol type\n");
1865 res
= sock_register(&tipc_family_ops
);
1867 err("Failed to register TIPC socket type\n");
1868 proto_unregister(&tipc_proto
);
1872 sockets_enabled
= 1;
1878 * tipc_socket_stop - stop TIPC socket interface
1881 void tipc_socket_stop(void)
1883 if (!sockets_enabled
)
1886 sockets_enabled
= 0;
1887 sock_unregister(tipc_family_ops
.family
);
1888 proto_unregister(&tipc_proto
);