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 */
66 struct tipc_portid peer_name
;
69 #define tipc_sk(sk) ((struct tipc_sock *)(sk))
70 #define tipc_sk_port(sk) ((struct tipc_port *)(tipc_sk(sk)->p))
72 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
73 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
);
74 static void wakeupdispatch(struct tipc_port
*tport
);
76 static const struct proto_ops packet_ops
;
77 static const struct proto_ops stream_ops
;
78 static const struct proto_ops msg_ops
;
80 static struct proto tipc_proto
;
82 static int sockets_enabled
= 0;
84 static atomic_t tipc_queue_size
= ATOMIC_INIT(0);
87 * Revised TIPC socket locking policy:
89 * Most socket operations take the standard socket lock when they start
90 * and hold it until they finish (or until they need to sleep). Acquiring
91 * this lock grants the owner exclusive access to the fields of the socket
92 * data structures, with the exception of the backlog queue. A few socket
93 * operations can be done without taking the socket lock because they only
94 * read socket information that never changes during the life of the socket.
96 * Socket operations may acquire the lock for the associated TIPC port if they
97 * need to perform an operation on the port. If any routine needs to acquire
98 * both the socket lock and the port lock it must take the socket lock first
99 * to avoid the risk of deadlock.
101 * The dispatcher handling incoming messages cannot grab the socket lock in
102 * the standard fashion, since invoked it runs at the BH level and cannot block.
103 * Instead, it checks to see if the socket lock is currently owned by someone,
104 * and either handles the message itself or adds it to the socket's backlog
105 * queue; in the latter case the queued message is processed once the process
106 * owning the socket lock releases it.
108 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
109 * the problem of a blocked socket operation preventing any other operations
110 * from occurring. However, applications must be careful if they have
111 * multiple threads trying to send (or receive) on the same socket, as these
112 * operations might interfere with each other. For example, doing a connect
113 * and a receive at the same time might allow the receive to consume the
114 * ACK message meant for the connect. While additional work could be done
115 * to try and overcome this, it doesn't seem to be worthwhile at the present.
117 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
118 * that another operation that must be performed in a non-blocking manner is
119 * not delayed for very long because the lock has already been taken.
121 * NOTE: This code assumes that certain fields of a port/socket pair are
122 * constant over its lifetime; such fields can be examined without taking
123 * the socket lock and/or port lock, and do not need to be re-read even
124 * after resuming processing after waiting. These fields include:
126 * - pointer to socket sk structure (aka tipc_sock structure)
127 * - pointer to port structure
132 * advance_rx_queue - discard first buffer in socket receive queue
134 * Caller must hold socket lock
137 static void advance_rx_queue(struct sock
*sk
)
139 buf_discard(__skb_dequeue(&sk
->sk_receive_queue
));
140 atomic_dec(&tipc_queue_size
);
144 * discard_rx_queue - discard all buffers in socket receive queue
146 * Caller must hold socket lock
149 static void discard_rx_queue(struct sock
*sk
)
153 while ((buf
= __skb_dequeue(&sk
->sk_receive_queue
))) {
154 atomic_dec(&tipc_queue_size
);
160 * reject_rx_queue - reject all buffers in socket receive queue
162 * Caller must hold socket lock
165 static void reject_rx_queue(struct sock
*sk
)
169 while ((buf
= __skb_dequeue(&sk
->sk_receive_queue
))) {
170 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
171 atomic_dec(&tipc_queue_size
);
176 * tipc_create - create a TIPC socket
177 * @net: network namespace (must be default network)
178 * @sock: pre-allocated socket structure
179 * @protocol: protocol indicator (must be 0)
181 * This routine creates additional data structures used by the TIPC socket,
182 * initializes them, and links them together.
184 * Returns 0 on success, errno otherwise
187 static int tipc_create(struct net
*net
, struct socket
*sock
, int protocol
)
189 const struct proto_ops
*ops
;
192 struct tipc_port
*tp_ptr
;
194 /* Validate arguments */
196 if (net
!= &init_net
)
197 return -EAFNOSUPPORT
;
199 if (unlikely(protocol
!= 0))
200 return -EPROTONOSUPPORT
;
202 switch (sock
->type
) {
205 state
= SS_UNCONNECTED
;
209 state
= SS_UNCONNECTED
;
220 /* Allocate socket's protocol area */
222 sk
= sk_alloc(net
, AF_TIPC
, GFP_KERNEL
, &tipc_proto
);
226 /* Allocate TIPC port for socket to use */
228 tp_ptr
= tipc_createport_raw(sk
, &dispatch
, &wakeupdispatch
,
229 TIPC_LOW_IMPORTANCE
);
230 if (unlikely(!tp_ptr
)) {
235 /* Finish initializing socket data structures */
240 sock_init_data(sock
, sk
);
241 sk
->sk_rcvtimeo
= msecs_to_jiffies(CONN_TIMEOUT_DEFAULT
);
242 sk
->sk_backlog_rcv
= backlog_rcv
;
243 tipc_sk(sk
)->p
= tp_ptr
;
245 spin_unlock_bh(tp_ptr
->lock
);
247 if (sock
->state
== SS_READY
) {
248 tipc_set_portunreturnable(tp_ptr
->ref
, 1);
249 if (sock
->type
== SOCK_DGRAM
)
250 tipc_set_portunreliable(tp_ptr
->ref
, 1);
253 atomic_inc(&tipc_user_count
);
258 * release - destroy a TIPC socket
259 * @sock: socket to destroy
261 * This routine cleans up any messages that are still queued on the socket.
262 * For DGRAM and RDM socket types, all queued messages are rejected.
263 * For SEQPACKET and STREAM socket types, the first message is rejected
264 * and any others are discarded. (If the first message on a STREAM socket
265 * is partially-read, it is discarded and the next one is rejected instead.)
267 * NOTE: Rejected messages are not necessarily returned to the sender! They
268 * are returned or discarded according to the "destination droppable" setting
269 * specified for the message by the sender.
271 * Returns 0 on success, errno otherwise
274 static int release(struct socket
*sock
)
276 struct sock
*sk
= sock
->sk
;
277 struct tipc_port
*tport
;
282 * Exit if socket isn't fully initialized (occurs when a failed accept()
283 * releases a pre-allocated child socket that was never used)
289 tport
= tipc_sk_port(sk
);
293 * Reject all unreceived messages, except on an active connection
294 * (which disconnects locally & sends a 'FIN+' to peer)
297 while (sock
->state
!= SS_DISCONNECTING
) {
298 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
301 atomic_dec(&tipc_queue_size
);
302 if (TIPC_SKB_CB(buf
)->handle
!= msg_data(buf_msg(buf
)))
305 if ((sock
->state
== SS_CONNECTING
) ||
306 (sock
->state
== SS_CONNECTED
)) {
307 sock
->state
= SS_DISCONNECTING
;
308 tipc_disconnect(tport
->ref
);
310 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
315 * Delete TIPC port; this ensures no more messages are queued
316 * (also disconnects an active connection & sends a 'FIN-' to peer)
319 res
= tipc_deleteport(tport
->ref
);
321 /* Discard any remaining (connection-based) messages in receive queue */
323 discard_rx_queue(sk
);
325 /* Reject any messages that accumulated in backlog queue */
327 sock
->state
= SS_DISCONNECTING
;
333 atomic_dec(&tipc_user_count
);
338 * bind - associate or disassocate TIPC name(s) with a socket
339 * @sock: socket structure
340 * @uaddr: socket address describing name(s) and desired operation
341 * @uaddr_len: size of socket address data structure
343 * Name and name sequence binding is indicated using a positive scope value;
344 * a negative scope value unbinds the specified name. Specifying no name
345 * (i.e. a socket address length of 0) unbinds all names from the socket.
347 * Returns 0 on success, errno otherwise
349 * NOTE: This routine doesn't need to take the socket lock since it doesn't
350 * access any non-constant socket information.
353 static int bind(struct socket
*sock
, struct sockaddr
*uaddr
, int uaddr_len
)
355 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
356 u32 portref
= tipc_sk_port(sock
->sk
)->ref
;
358 if (unlikely(!uaddr_len
))
359 return tipc_withdraw(portref
, 0, NULL
);
361 if (uaddr_len
< sizeof(struct sockaddr_tipc
))
363 if (addr
->family
!= AF_TIPC
)
364 return -EAFNOSUPPORT
;
366 if (addr
->addrtype
== TIPC_ADDR_NAME
)
367 addr
->addr
.nameseq
.upper
= addr
->addr
.nameseq
.lower
;
368 else if (addr
->addrtype
!= TIPC_ADDR_NAMESEQ
)
369 return -EAFNOSUPPORT
;
371 return (addr
->scope
> 0) ?
372 tipc_publish(portref
, addr
->scope
, &addr
->addr
.nameseq
) :
373 tipc_withdraw(portref
, -addr
->scope
, &addr
->addr
.nameseq
);
377 * get_name - get port ID of socket or peer socket
378 * @sock: socket structure
379 * @uaddr: area for returned socket address
380 * @uaddr_len: area for returned length of socket address
381 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
383 * Returns 0 on success, errno otherwise
385 * NOTE: This routine doesn't need to take the socket lock since it only
386 * accesses socket information that is unchanging (or which changes in
387 * a completely predictable manner).
390 static int get_name(struct socket
*sock
, struct sockaddr
*uaddr
,
391 int *uaddr_len
, int peer
)
393 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
394 struct tipc_sock
*tsock
= tipc_sk(sock
->sk
);
397 if ((sock
->state
!= SS_CONNECTED
) &&
398 ((peer
!= 2) || (sock
->state
!= SS_DISCONNECTING
)))
400 addr
->addr
.id
.ref
= tsock
->peer_name
.ref
;
401 addr
->addr
.id
.node
= tsock
->peer_name
.node
;
403 tipc_ownidentity(tsock
->p
->ref
, &addr
->addr
.id
);
406 *uaddr_len
= sizeof(*addr
);
407 addr
->addrtype
= TIPC_ADDR_ID
;
408 addr
->family
= AF_TIPC
;
410 addr
->addr
.name
.domain
= 0;
416 * poll - read and possibly block on pollmask
417 * @file: file structure associated with the socket
418 * @sock: socket for which to calculate the poll bits
421 * Returns pollmask value
424 * It appears that the usual socket locking mechanisms are not useful here
425 * since the pollmask info is potentially out-of-date the moment this routine
426 * exits. TCP and other protocols seem to rely on higher level poll routines
427 * to handle any preventable race conditions, so TIPC will do the same ...
429 * TIPC sets the returned events as follows:
430 * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty
431 * or if a connection-oriented socket is does not have an active connection
432 * (i.e. a read operation will not block).
433 * b) POLLOUT is set except when a socket's connection has been terminated
434 * (i.e. a write operation will not block).
435 * c) POLLHUP is set when a socket's connection has been terminated.
437 * IMPORTANT: The fact that a read or write operation will not block does NOT
438 * imply that the operation will succeed!
441 static unsigned int poll(struct file
*file
, struct socket
*sock
,
444 struct sock
*sk
= sock
->sk
;
447 poll_wait(file
, sk
->sk_sleep
, wait
);
449 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
450 (sock
->state
== SS_UNCONNECTED
) ||
451 (sock
->state
== SS_DISCONNECTING
))
452 mask
= (POLLRDNORM
| POLLIN
);
456 if (sock
->state
== SS_DISCONNECTING
)
465 * dest_name_check - verify user is permitted to send to specified port name
466 * @dest: destination address
467 * @m: descriptor for message to be sent
469 * Prevents restricted configuration commands from being issued by
470 * unauthorized users.
472 * Returns 0 if permission is granted, otherwise errno
475 static int dest_name_check(struct sockaddr_tipc
*dest
, struct msghdr
*m
)
477 struct tipc_cfg_msg_hdr hdr
;
479 if (likely(dest
->addr
.name
.name
.type
>= TIPC_RESERVED_TYPES
))
481 if (likely(dest
->addr
.name
.name
.type
== TIPC_TOP_SRV
))
483 if (likely(dest
->addr
.name
.name
.type
!= TIPC_CFG_SRV
))
486 if (copy_from_user(&hdr
, m
->msg_iov
[0].iov_base
, sizeof(hdr
)))
488 if ((ntohs(hdr
.tcm_type
) & 0xC000) && (!capable(CAP_NET_ADMIN
)))
495 * send_msg - send message in connectionless manner
496 * @iocb: if NULL, indicates that socket lock is already held
497 * @sock: socket structure
498 * @m: message to send
499 * @total_len: length of message
501 * Message must have an destination specified explicitly.
502 * Used for SOCK_RDM and SOCK_DGRAM messages,
503 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
504 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
506 * Returns the number of bytes sent on success, or errno otherwise
509 static int send_msg(struct kiocb
*iocb
, struct socket
*sock
,
510 struct msghdr
*m
, size_t total_len
)
512 struct sock
*sk
= sock
->sk
;
513 struct tipc_port
*tport
= tipc_sk_port(sk
);
514 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
519 return -EDESTADDRREQ
;
520 if (unlikely((m
->msg_namelen
< sizeof(*dest
)) ||
521 (dest
->family
!= AF_TIPC
)))
527 needs_conn
= (sock
->state
!= SS_READY
);
528 if (unlikely(needs_conn
)) {
529 if (sock
->state
== SS_LISTENING
) {
533 if (sock
->state
!= SS_UNCONNECTED
) {
537 if ((tport
->published
) ||
538 ((sock
->type
== SOCK_STREAM
) && (total_len
!= 0))) {
542 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
543 tport
->conn_type
= dest
->addr
.name
.name
.type
;
544 tport
->conn_instance
= dest
->addr
.name
.name
.instance
;
547 /* Abort any pending connection attempts (very unlikely) */
553 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
554 if ((res
= dest_name_check(dest
, m
)))
556 res
= tipc_send2name(tport
->ref
,
557 &dest
->addr
.name
.name
,
558 dest
->addr
.name
.domain
,
562 else if (dest
->addrtype
== TIPC_ADDR_ID
) {
563 res
= tipc_send2port(tport
->ref
,
568 else if (dest
->addrtype
== TIPC_ADDR_MCAST
) {
573 if ((res
= dest_name_check(dest
, m
)))
575 res
= tipc_multicast(tport
->ref
,
581 if (likely(res
!= -ELINKCONG
)) {
582 if (needs_conn
&& (res
>= 0)) {
583 sock
->state
= SS_CONNECTING
;
587 if (m
->msg_flags
& MSG_DONTWAIT
) {
592 res
= wait_event_interruptible(*sk
->sk_sleep
,
606 * send_packet - send a connection-oriented message
607 * @iocb: if NULL, indicates that socket lock is already held
608 * @sock: socket structure
609 * @m: message to send
610 * @total_len: length of message
612 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
614 * Returns the number of bytes sent on success, or errno otherwise
617 static int send_packet(struct kiocb
*iocb
, struct socket
*sock
,
618 struct msghdr
*m
, size_t total_len
)
620 struct sock
*sk
= sock
->sk
;
621 struct tipc_port
*tport
= tipc_sk_port(sk
);
622 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
625 /* Handle implied connection establishment */
628 return send_msg(iocb
, sock
, m
, total_len
);
634 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
635 if (sock
->state
== SS_DISCONNECTING
)
642 res
= tipc_send(tport
->ref
, m
->msg_iovlen
, m
->msg_iov
);
643 if (likely(res
!= -ELINKCONG
)) {
646 if (m
->msg_flags
& MSG_DONTWAIT
) {
651 res
= wait_event_interruptible(*sk
->sk_sleep
,
652 (!tport
->congested
|| !tport
->connected
));
664 * send_stream - send stream-oriented data
666 * @sock: socket structure
668 * @total_len: total length of data to be sent
670 * Used for SOCK_STREAM data.
672 * Returns the number of bytes sent on success (or partial success),
673 * or errno if no data sent
676 static int send_stream(struct kiocb
*iocb
, struct socket
*sock
,
677 struct msghdr
*m
, size_t total_len
)
679 struct sock
*sk
= sock
->sk
;
680 struct tipc_port
*tport
= tipc_sk_port(sk
);
681 struct msghdr my_msg
;
683 struct iovec
*curr_iov
;
685 char __user
*curr_start
;
694 /* Handle special cases where there is no connection */
696 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
697 if (sock
->state
== SS_UNCONNECTED
) {
698 res
= send_packet(NULL
, sock
, m
, total_len
);
700 } else if (sock
->state
== SS_DISCONNECTING
) {
709 if (unlikely(m
->msg_name
)) {
715 * Send each iovec entry using one or more messages
717 * Note: This algorithm is good for the most likely case
718 * (i.e. one large iovec entry), but could be improved to pass sets
719 * of small iovec entries into send_packet().
722 curr_iov
= m
->msg_iov
;
723 curr_iovlen
= m
->msg_iovlen
;
724 my_msg
.msg_iov
= &my_iov
;
725 my_msg
.msg_iovlen
= 1;
726 my_msg
.msg_flags
= m
->msg_flags
;
727 my_msg
.msg_name
= NULL
;
730 hdr_size
= msg_hdr_sz(&tport
->phdr
);
732 while (curr_iovlen
--) {
733 curr_start
= curr_iov
->iov_base
;
734 curr_left
= curr_iov
->iov_len
;
737 bytes_to_send
= tport
->max_pkt
- hdr_size
;
738 if (bytes_to_send
> TIPC_MAX_USER_MSG_SIZE
)
739 bytes_to_send
= TIPC_MAX_USER_MSG_SIZE
;
740 if (curr_left
< bytes_to_send
)
741 bytes_to_send
= curr_left
;
742 my_iov
.iov_base
= curr_start
;
743 my_iov
.iov_len
= bytes_to_send
;
744 if ((res
= send_packet(NULL
, sock
, &my_msg
, 0)) < 0) {
749 curr_left
-= bytes_to_send
;
750 curr_start
+= bytes_to_send
;
751 bytes_sent
+= bytes_to_send
;
763 * auto_connect - complete connection setup to a remote port
764 * @sock: socket structure
765 * @msg: peer's response message
767 * Returns 0 on success, errno otherwise
770 static int auto_connect(struct socket
*sock
, struct tipc_msg
*msg
)
772 struct tipc_sock
*tsock
= tipc_sk(sock
->sk
);
774 if (msg_errcode(msg
)) {
775 sock
->state
= SS_DISCONNECTING
;
776 return -ECONNREFUSED
;
779 tsock
->peer_name
.ref
= msg_origport(msg
);
780 tsock
->peer_name
.node
= msg_orignode(msg
);
781 tipc_connect2port(tsock
->p
->ref
, &tsock
->peer_name
);
782 tipc_set_portimportance(tsock
->p
->ref
, msg_importance(msg
));
783 sock
->state
= SS_CONNECTED
;
788 * set_orig_addr - capture sender's address for received message
789 * @m: descriptor for message info
790 * @msg: received message header
792 * Note: Address is not captured if not requested by receiver.
795 static void set_orig_addr(struct msghdr
*m
, struct tipc_msg
*msg
)
797 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)m
->msg_name
;
800 addr
->family
= AF_TIPC
;
801 addr
->addrtype
= TIPC_ADDR_ID
;
802 addr
->addr
.id
.ref
= msg_origport(msg
);
803 addr
->addr
.id
.node
= msg_orignode(msg
);
804 addr
->addr
.name
.domain
= 0; /* could leave uninitialized */
805 addr
->scope
= 0; /* could leave uninitialized */
806 m
->msg_namelen
= sizeof(struct sockaddr_tipc
);
811 * anc_data_recv - optionally capture ancillary data for received message
812 * @m: descriptor for message info
813 * @msg: received message header
814 * @tport: TIPC port associated with message
816 * Note: Ancillary data is not captured if not requested by receiver.
818 * Returns 0 if successful, otherwise errno
821 static int anc_data_recv(struct msghdr
*m
, struct tipc_msg
*msg
,
822 struct tipc_port
*tport
)
830 if (likely(m
->msg_controllen
== 0))
833 /* Optionally capture errored message object(s) */
835 err
= msg
? msg_errcode(msg
) : 0;
838 anc_data
[1] = msg_data_sz(msg
);
839 if ((res
= put_cmsg(m
, SOL_TIPC
, TIPC_ERRINFO
, 8, anc_data
)))
842 (res
= put_cmsg(m
, SOL_TIPC
, TIPC_RETDATA
, anc_data
[1],
847 /* Optionally capture message destination object */
849 dest_type
= msg
? msg_type(msg
) : TIPC_DIRECT_MSG
;
853 anc_data
[0] = msg_nametype(msg
);
854 anc_data
[1] = msg_namelower(msg
);
855 anc_data
[2] = msg_namelower(msg
);
859 anc_data
[0] = msg_nametype(msg
);
860 anc_data
[1] = msg_namelower(msg
);
861 anc_data
[2] = msg_nameupper(msg
);
864 has_name
= (tport
->conn_type
!= 0);
865 anc_data
[0] = tport
->conn_type
;
866 anc_data
[1] = tport
->conn_instance
;
867 anc_data
[2] = tport
->conn_instance
;
873 (res
= put_cmsg(m
, SOL_TIPC
, TIPC_DESTNAME
, 12, anc_data
)))
880 * recv_msg - receive packet-oriented message
882 * @m: descriptor for message info
883 * @buf_len: total size of user buffer area
884 * @flags: receive flags
886 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
887 * If the complete message doesn't fit in user area, truncate it.
889 * Returns size of returned message data, errno otherwise
892 static int recv_msg(struct kiocb
*iocb
, struct socket
*sock
,
893 struct msghdr
*m
, size_t buf_len
, int flags
)
895 struct sock
*sk
= sock
->sk
;
896 struct tipc_port
*tport
= tipc_sk_port(sk
);
898 struct tipc_msg
*msg
;
903 /* Catch invalid receive requests */
905 if (m
->msg_iovlen
!= 1)
906 return -EOPNOTSUPP
; /* Don't do multiple iovec entries yet */
908 if (unlikely(!buf_len
))
913 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
920 /* Look for a message in receive queue; wait if necessary */
922 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
923 if (sock
->state
== SS_DISCONNECTING
) {
927 if (flags
& MSG_DONTWAIT
) {
932 res
= wait_event_interruptible(*sk
->sk_sleep
,
933 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
934 (sock
->state
== SS_DISCONNECTING
)));
940 /* Look at first message in receive queue */
942 buf
= skb_peek(&sk
->sk_receive_queue
);
944 sz
= msg_data_sz(msg
);
945 err
= msg_errcode(msg
);
947 /* Complete connection setup for an implied connect */
949 if (unlikely(sock
->state
== SS_CONNECTING
)) {
950 res
= auto_connect(sock
, msg
);
955 /* Discard an empty non-errored message & try again */
957 if ((!sz
) && (!err
)) {
958 advance_rx_queue(sk
);
962 /* Capture sender's address (optional) */
964 set_orig_addr(m
, msg
);
966 /* Capture ancillary data (optional) */
968 res
= anc_data_recv(m
, msg
, tport
);
972 /* Capture message data (if valid) & compute return value (always) */
975 if (unlikely(buf_len
< sz
)) {
977 m
->msg_flags
|= MSG_TRUNC
;
979 if (unlikely(copy_to_user(m
->msg_iov
->iov_base
, msg_data(msg
),
986 if ((sock
->state
== SS_READY
) ||
987 ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
))
993 /* Consume received message (optional) */
995 if (likely(!(flags
& MSG_PEEK
))) {
996 if ((sock
->state
!= SS_READY
) &&
997 (++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
998 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
999 advance_rx_queue(sk
);
1007 * recv_stream - receive stream-oriented data
1009 * @m: descriptor for message info
1010 * @buf_len: total size of user buffer area
1011 * @flags: receive flags
1013 * Used for SOCK_STREAM messages only. If not enough data is available
1014 * will optionally wait for more; never truncates data.
1016 * Returns size of returned message data, errno otherwise
1019 static int recv_stream(struct kiocb
*iocb
, struct socket
*sock
,
1020 struct msghdr
*m
, size_t buf_len
, int flags
)
1022 struct sock
*sk
= sock
->sk
;
1023 struct tipc_port
*tport
= tipc_sk_port(sk
);
1024 struct sk_buff
*buf
;
1025 struct tipc_msg
*msg
;
1030 char __user
*crs
= m
->msg_iov
->iov_base
;
1031 unsigned char *buf_crs
;
1035 /* Catch invalid receive attempts */
1037 if (m
->msg_iovlen
!= 1)
1038 return -EOPNOTSUPP
; /* Don't do multiple iovec entries yet */
1040 if (unlikely(!buf_len
))
1045 if (unlikely((sock
->state
== SS_UNCONNECTED
) ||
1046 (sock
->state
== SS_CONNECTING
))) {
1053 /* Look for a message in receive queue; wait if necessary */
1055 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1056 if (sock
->state
== SS_DISCONNECTING
) {
1060 if (flags
& MSG_DONTWAIT
) {
1065 res
= wait_event_interruptible(*sk
->sk_sleep
,
1066 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1067 (sock
->state
== SS_DISCONNECTING
)));
1073 /* Look at first message in receive queue */
1075 buf
= skb_peek(&sk
->sk_receive_queue
);
1077 sz
= msg_data_sz(msg
);
1078 err
= msg_errcode(msg
);
1080 /* Discard an empty non-errored message & try again */
1082 if ((!sz
) && (!err
)) {
1083 advance_rx_queue(sk
);
1087 /* Optionally capture sender's address & ancillary data of first msg */
1089 if (sz_copied
== 0) {
1090 set_orig_addr(m
, msg
);
1091 res
= anc_data_recv(m
, msg
, tport
);
1096 /* Capture message data (if valid) & compute return value (always) */
1099 buf_crs
= (unsigned char *)(TIPC_SKB_CB(buf
)->handle
);
1100 sz
= (unsigned char *)msg
+ msg_size(msg
) - buf_crs
;
1102 needed
= (buf_len
- sz_copied
);
1103 sz_to_copy
= (sz
<= needed
) ? sz
: needed
;
1104 if (unlikely(copy_to_user(crs
, buf_crs
, sz_to_copy
))) {
1108 sz_copied
+= sz_to_copy
;
1110 if (sz_to_copy
< sz
) {
1111 if (!(flags
& MSG_PEEK
))
1112 TIPC_SKB_CB(buf
)->handle
= buf_crs
+ sz_to_copy
;
1119 goto exit
; /* can't add error msg to valid data */
1121 if ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
)
1127 /* Consume received message (optional) */
1129 if (likely(!(flags
& MSG_PEEK
))) {
1130 if (unlikely(++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
1131 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
1132 advance_rx_queue(sk
);
1135 /* Loop around if more data is required */
1137 if ((sz_copied
< buf_len
) /* didn't get all requested data */
1138 && (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1139 (flags
& MSG_WAITALL
))
1140 /* ... and more is ready or required */
1141 && (!(flags
& MSG_PEEK
)) /* ... and aren't just peeking at data */
1142 && (!err
) /* ... and haven't reached a FIN */
1148 return sz_copied
? sz_copied
: res
;
1152 * rx_queue_full - determine if receive queue can accept another message
1153 * @msg: message to be added to queue
1154 * @queue_size: current size of queue
1155 * @base: nominal maximum size of queue
1157 * Returns 1 if queue is unable to accept message, 0 otherwise
1160 static int rx_queue_full(struct tipc_msg
*msg
, u32 queue_size
, u32 base
)
1163 u32 imp
= msg_importance(msg
);
1165 if (imp
== TIPC_LOW_IMPORTANCE
)
1167 else if (imp
== TIPC_MEDIUM_IMPORTANCE
)
1168 threshold
= base
* 2;
1169 else if (imp
== TIPC_HIGH_IMPORTANCE
)
1170 threshold
= base
* 100;
1174 if (msg_connected(msg
))
1177 return (queue_size
>= threshold
);
1181 * filter_rcv - validate incoming message
1185 * Enqueues message on receive queue if acceptable; optionally handles
1186 * disconnect indication for a connected socket.
1188 * Called with socket lock already taken; port lock may also be taken.
1190 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1193 static u32
filter_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1195 struct socket
*sock
= sk
->sk_socket
;
1196 struct tipc_msg
*msg
= buf_msg(buf
);
1199 /* Reject message if it is wrong sort of message for socket */
1202 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
1203 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
1204 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
1207 if (sock
->state
== SS_READY
) {
1208 if (msg_connected(msg
)) {
1209 msg_dbg(msg
, "dispatch filter 1\n");
1210 return TIPC_ERR_NO_PORT
;
1213 if (msg_mcast(msg
)) {
1214 msg_dbg(msg
, "dispatch filter 2\n");
1215 return TIPC_ERR_NO_PORT
;
1217 if (sock
->state
== SS_CONNECTED
) {
1218 if (!msg_connected(msg
)) {
1219 msg_dbg(msg
, "dispatch filter 3\n");
1220 return TIPC_ERR_NO_PORT
;
1223 else if (sock
->state
== SS_CONNECTING
) {
1224 if (!msg_connected(msg
) && (msg_errcode(msg
) == 0)) {
1225 msg_dbg(msg
, "dispatch filter 4\n");
1226 return TIPC_ERR_NO_PORT
;
1229 else if (sock
->state
== SS_LISTENING
) {
1230 if (msg_connected(msg
) || msg_errcode(msg
)) {
1231 msg_dbg(msg
, "dispatch filter 5\n");
1232 return TIPC_ERR_NO_PORT
;
1235 else if (sock
->state
== SS_DISCONNECTING
) {
1236 msg_dbg(msg
, "dispatch filter 6\n");
1237 return TIPC_ERR_NO_PORT
;
1239 else /* (sock->state == SS_UNCONNECTED) */ {
1240 if (msg_connected(msg
) || msg_errcode(msg
)) {
1241 msg_dbg(msg
, "dispatch filter 7\n");
1242 return TIPC_ERR_NO_PORT
;
1247 /* Reject message if there isn't room to queue it */
1249 recv_q_len
= (u32
)atomic_read(&tipc_queue_size
);
1250 if (unlikely(recv_q_len
>= OVERLOAD_LIMIT_BASE
)) {
1251 if (rx_queue_full(msg
, recv_q_len
, OVERLOAD_LIMIT_BASE
))
1252 return TIPC_ERR_OVERLOAD
;
1254 recv_q_len
= skb_queue_len(&sk
->sk_receive_queue
);
1255 if (unlikely(recv_q_len
>= (OVERLOAD_LIMIT_BASE
/ 2))) {
1256 if (rx_queue_full(msg
, recv_q_len
, OVERLOAD_LIMIT_BASE
/ 2))
1257 return TIPC_ERR_OVERLOAD
;
1260 /* Enqueue message (finally!) */
1262 msg_dbg(msg
, "<DISP<: ");
1263 TIPC_SKB_CB(buf
)->handle
= msg_data(msg
);
1264 atomic_inc(&tipc_queue_size
);
1265 __skb_queue_tail(&sk
->sk_receive_queue
, buf
);
1267 /* Initiate connection termination for an incoming 'FIN' */
1269 if (unlikely(msg_errcode(msg
) && (sock
->state
== SS_CONNECTED
))) {
1270 sock
->state
= SS_DISCONNECTING
;
1271 tipc_disconnect_port(tipc_sk_port(sk
));
1274 if (waitqueue_active(sk
->sk_sleep
))
1275 wake_up_interruptible(sk
->sk_sleep
);
1280 * backlog_rcv - handle incoming message from backlog queue
1284 * Caller must hold socket lock, but not port lock.
1289 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1293 res
= filter_rcv(sk
, buf
);
1295 tipc_reject_msg(buf
, res
);
1300 * dispatch - handle incoming message
1301 * @tport: TIPC port that received message
1304 * Called with port lock already taken.
1306 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1309 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
)
1311 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1315 * Process message if socket is unlocked; otherwise add to backlog queue
1317 * This code is based on sk_receive_skb(), but must be distinct from it
1318 * since a TIPC-specific filter/reject mechanism is utilized
1322 if (!sock_owned_by_user(sk
)) {
1323 res
= filter_rcv(sk
, buf
);
1325 sk_add_backlog(sk
, buf
);
1334 * wakeupdispatch - wake up port after congestion
1335 * @tport: port to wakeup
1337 * Called with port lock already taken.
1340 static void wakeupdispatch(struct tipc_port
*tport
)
1342 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1344 if (waitqueue_active(sk
->sk_sleep
))
1345 wake_up_interruptible(sk
->sk_sleep
);
1349 * connect - establish a connection to another TIPC port
1350 * @sock: socket structure
1351 * @dest: socket address for destination port
1352 * @destlen: size of socket address data structure
1353 * @flags: file-related flags associated with socket
1355 * Returns 0 on success, errno otherwise
1358 static int connect(struct socket
*sock
, struct sockaddr
*dest
, int destlen
,
1361 struct sock
*sk
= sock
->sk
;
1362 struct sockaddr_tipc
*dst
= (struct sockaddr_tipc
*)dest
;
1363 struct msghdr m
= {NULL
,};
1364 struct sk_buff
*buf
;
1365 struct tipc_msg
*msg
;
1370 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1372 if (sock
->state
== SS_READY
) {
1377 /* For now, TIPC does not support the non-blocking form of connect() */
1379 if (flags
& O_NONBLOCK
) {
1384 /* Issue Posix-compliant error code if socket is in the wrong state */
1386 if (sock
->state
== SS_LISTENING
) {
1390 if (sock
->state
== SS_CONNECTING
) {
1394 if (sock
->state
!= SS_UNCONNECTED
) {
1400 * Reject connection attempt using multicast address
1402 * Note: send_msg() validates the rest of the address fields,
1403 * so there's no need to do it here
1406 if (dst
->addrtype
== TIPC_ADDR_MCAST
) {
1411 /* Reject any messages already in receive queue (very unlikely) */
1413 reject_rx_queue(sk
);
1415 /* Send a 'SYN-' to destination */
1418 m
.msg_namelen
= destlen
;
1419 res
= send_msg(NULL
, sock
, &m
, 0);
1424 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1427 res
= wait_event_interruptible_timeout(*sk
->sk_sleep
,
1428 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1429 (sock
->state
!= SS_CONNECTING
)),
1434 buf
= skb_peek(&sk
->sk_receive_queue
);
1437 res
= auto_connect(sock
, msg
);
1439 if (!msg_data_sz(msg
))
1440 advance_rx_queue(sk
);
1443 if (sock
->state
== SS_CONNECTED
) {
1446 res
= -ECONNREFUSED
;
1453 ; /* leave "res" unchanged */
1454 sock
->state
= SS_DISCONNECTING
;
1463 * listen - allow socket to listen for incoming connections
1464 * @sock: socket structure
1467 * Returns 0 on success, errno otherwise
1470 static int listen(struct socket
*sock
, int len
)
1472 struct sock
*sk
= sock
->sk
;
1477 if (sock
->state
== SS_READY
)
1479 else if (sock
->state
!= SS_UNCONNECTED
)
1482 sock
->state
= SS_LISTENING
;
1491 * accept - wait for connection request
1492 * @sock: listening socket
1493 * @newsock: new socket that is to be connected
1494 * @flags: file-related flags associated with socket
1496 * Returns 0 on success, errno otherwise
1499 static int accept(struct socket
*sock
, struct socket
*new_sock
, int flags
)
1501 struct sock
*sk
= sock
->sk
;
1502 struct sk_buff
*buf
;
1507 if (sock
->state
== SS_READY
) {
1511 if (sock
->state
!= SS_LISTENING
) {
1516 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1517 if (flags
& O_NONBLOCK
) {
1522 res
= wait_event_interruptible(*sk
->sk_sleep
,
1523 (!skb_queue_empty(&sk
->sk_receive_queue
)));
1529 buf
= skb_peek(&sk
->sk_receive_queue
);
1531 res
= tipc_create(sock_net(sock
->sk
), new_sock
, 0);
1533 struct sock
*new_sk
= new_sock
->sk
;
1534 struct tipc_sock
*new_tsock
= tipc_sk(new_sk
);
1535 struct tipc_port
*new_tport
= new_tsock
->p
;
1536 u32 new_ref
= new_tport
->ref
;
1537 struct tipc_msg
*msg
= buf_msg(buf
);
1542 * Reject any stray messages received by new socket
1543 * before the socket lock was taken (very, very unlikely)
1546 reject_rx_queue(new_sk
);
1548 /* Connect new socket to it's peer */
1550 new_tsock
->peer_name
.ref
= msg_origport(msg
);
1551 new_tsock
->peer_name
.node
= msg_orignode(msg
);
1552 tipc_connect2port(new_ref
, &new_tsock
->peer_name
);
1553 new_sock
->state
= SS_CONNECTED
;
1555 tipc_set_portimportance(new_ref
, msg_importance(msg
));
1556 if (msg_named(msg
)) {
1557 new_tport
->conn_type
= msg_nametype(msg
);
1558 new_tport
->conn_instance
= msg_nameinst(msg
);
1562 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1563 * Respond to 'SYN+' by queuing it on new socket.
1566 msg_dbg(msg
,"<ACC<: ");
1567 if (!msg_data_sz(msg
)) {
1568 struct msghdr m
= {NULL
,};
1570 advance_rx_queue(sk
);
1571 send_packet(NULL
, new_sock
, &m
, 0);
1573 __skb_dequeue(&sk
->sk_receive_queue
);
1574 __skb_queue_head(&new_sk
->sk_receive_queue
, buf
);
1576 release_sock(new_sk
);
1584 * shutdown - shutdown socket connection
1585 * @sock: socket structure
1586 * @how: direction to close (must be SHUT_RDWR)
1588 * Terminates connection (if necessary), then purges socket's receive queue.
1590 * Returns 0 on success, errno otherwise
1593 static int shutdown(struct socket
*sock
, int how
)
1595 struct sock
*sk
= sock
->sk
;
1596 struct tipc_port
*tport
= tipc_sk_port(sk
);
1597 struct sk_buff
*buf
;
1600 if (how
!= SHUT_RDWR
)
1605 switch (sock
->state
) {
1609 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1611 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
1613 atomic_dec(&tipc_queue_size
);
1614 if (TIPC_SKB_CB(buf
)->handle
!= msg_data(buf_msg(buf
))) {
1618 tipc_disconnect(tport
->ref
);
1619 tipc_reject_msg(buf
, TIPC_CONN_SHUTDOWN
);
1621 tipc_shutdown(tport
->ref
);
1624 sock
->state
= SS_DISCONNECTING
;
1628 case SS_DISCONNECTING
:
1630 /* Discard any unreceived messages; wake up sleeping tasks */
1632 discard_rx_queue(sk
);
1633 if (waitqueue_active(sk
->sk_sleep
))
1634 wake_up_interruptible(sk
->sk_sleep
);
1647 * setsockopt - set socket option
1648 * @sock: socket structure
1649 * @lvl: option level
1650 * @opt: option identifier
1651 * @ov: pointer to new option value
1652 * @ol: length of option value
1654 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1655 * (to ease compatibility).
1657 * Returns 0 on success, errno otherwise
1660 static int setsockopt(struct socket
*sock
,
1661 int lvl
, int opt
, char __user
*ov
, unsigned int ol
)
1663 struct sock
*sk
= sock
->sk
;
1664 struct tipc_port
*tport
= tipc_sk_port(sk
);
1668 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1670 if (lvl
!= SOL_TIPC
)
1671 return -ENOPROTOOPT
;
1672 if (ol
< sizeof(value
))
1674 if ((res
= get_user(value
, (u32 __user
*)ov
)))
1680 case TIPC_IMPORTANCE
:
1681 res
= tipc_set_portimportance(tport
->ref
, value
);
1683 case TIPC_SRC_DROPPABLE
:
1684 if (sock
->type
!= SOCK_STREAM
)
1685 res
= tipc_set_portunreliable(tport
->ref
, value
);
1689 case TIPC_DEST_DROPPABLE
:
1690 res
= tipc_set_portunreturnable(tport
->ref
, value
);
1692 case TIPC_CONN_TIMEOUT
:
1693 sk
->sk_rcvtimeo
= msecs_to_jiffies(value
);
1694 /* no need to set "res", since already 0 at this point */
1706 * getsockopt - get socket option
1707 * @sock: socket structure
1708 * @lvl: option level
1709 * @opt: option identifier
1710 * @ov: receptacle for option value
1711 * @ol: receptacle for length of option value
1713 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1714 * (to ease compatibility).
1716 * Returns 0 on success, errno otherwise
1719 static int getsockopt(struct socket
*sock
,
1720 int lvl
, int opt
, char __user
*ov
, int __user
*ol
)
1722 struct sock
*sk
= sock
->sk
;
1723 struct tipc_port
*tport
= tipc_sk_port(sk
);
1728 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1729 return put_user(0, ol
);
1730 if (lvl
!= SOL_TIPC
)
1731 return -ENOPROTOOPT
;
1732 if ((res
= get_user(len
, ol
)))
1738 case TIPC_IMPORTANCE
:
1739 res
= tipc_portimportance(tport
->ref
, &value
);
1741 case TIPC_SRC_DROPPABLE
:
1742 res
= tipc_portunreliable(tport
->ref
, &value
);
1744 case TIPC_DEST_DROPPABLE
:
1745 res
= tipc_portunreturnable(tport
->ref
, &value
);
1747 case TIPC_CONN_TIMEOUT
:
1748 value
= jiffies_to_msecs(sk
->sk_rcvtimeo
);
1749 /* no need to set "res", since already 0 at this point */
1751 case TIPC_NODE_RECVQ_DEPTH
:
1752 value
= (u32
)atomic_read(&tipc_queue_size
);
1754 case TIPC_SOCK_RECVQ_DEPTH
:
1755 value
= skb_queue_len(&sk
->sk_receive_queue
);
1766 else if (len
< sizeof(value
)) {
1769 else if (copy_to_user(ov
, &value
, sizeof(value
))) {
1773 res
= put_user(sizeof(value
), ol
);
1780 * Protocol switches for the various types of TIPC sockets
1783 static const struct proto_ops msg_ops
= {
1784 .owner
= THIS_MODULE
,
1789 .socketpair
= sock_no_socketpair
,
1791 .getname
= get_name
,
1793 .ioctl
= sock_no_ioctl
,
1795 .shutdown
= shutdown
,
1796 .setsockopt
= setsockopt
,
1797 .getsockopt
= getsockopt
,
1798 .sendmsg
= send_msg
,
1799 .recvmsg
= recv_msg
,
1800 .mmap
= sock_no_mmap
,
1801 .sendpage
= sock_no_sendpage
1804 static const struct proto_ops packet_ops
= {
1805 .owner
= THIS_MODULE
,
1810 .socketpair
= sock_no_socketpair
,
1812 .getname
= get_name
,
1814 .ioctl
= sock_no_ioctl
,
1816 .shutdown
= shutdown
,
1817 .setsockopt
= setsockopt
,
1818 .getsockopt
= getsockopt
,
1819 .sendmsg
= send_packet
,
1820 .recvmsg
= recv_msg
,
1821 .mmap
= sock_no_mmap
,
1822 .sendpage
= sock_no_sendpage
1825 static const struct proto_ops stream_ops
= {
1826 .owner
= THIS_MODULE
,
1831 .socketpair
= sock_no_socketpair
,
1833 .getname
= get_name
,
1835 .ioctl
= sock_no_ioctl
,
1837 .shutdown
= shutdown
,
1838 .setsockopt
= setsockopt
,
1839 .getsockopt
= getsockopt
,
1840 .sendmsg
= send_stream
,
1841 .recvmsg
= recv_stream
,
1842 .mmap
= sock_no_mmap
,
1843 .sendpage
= sock_no_sendpage
1846 static const struct net_proto_family tipc_family_ops
= {
1847 .owner
= THIS_MODULE
,
1849 .create
= tipc_create
1852 static struct proto tipc_proto
= {
1854 .owner
= THIS_MODULE
,
1855 .obj_size
= sizeof(struct tipc_sock
)
1859 * tipc_socket_init - initialize TIPC socket interface
1861 * Returns 0 on success, errno otherwise
1863 int tipc_socket_init(void)
1867 res
= proto_register(&tipc_proto
, 1);
1869 err("Failed to register TIPC protocol type\n");
1873 res
= sock_register(&tipc_family_ops
);
1875 err("Failed to register TIPC socket type\n");
1876 proto_unregister(&tipc_proto
);
1880 sockets_enabled
= 1;
1886 * tipc_socket_stop - stop TIPC socket interface
1889 void tipc_socket_stop(void)
1891 if (!sockets_enabled
)
1894 sockets_enabled
= 0;
1895 sock_unregister(tipc_family_ops
.family
);
1896 proto_unregister(&tipc_proto
);