2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2004-2007, 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
;
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 portref
= tipc_createport_raw(sk
, &dispatch
, &wakeupdispatch
,
229 TIPC_LOW_IMPORTANCE
, &tp_ptr
);
230 if (unlikely(portref
== 0)) {
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
= tipc_get_port(portref
);
245 spin_unlock_bh(tp_ptr
->lock
);
247 if (sock
->state
== SS_READY
) {
248 tipc_set_portunreturnable(portref
, 1);
249 if (sock
->type
== SOCK_DGRAM
)
250 tipc_set_portunreliable(portref
, 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 to obtain socket name, 1 to obtain peer socket name
383 * Returns 0 on success, errno otherwise
385 * NOTE: This routine doesn't need to take the socket lock since it doesn't
386 * access any non-constant socket information.
389 static int get_name(struct socket
*sock
, struct sockaddr
*uaddr
,
390 int *uaddr_len
, int peer
)
392 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
393 u32 portref
= tipc_sk_port(sock
->sk
)->ref
;
397 res
= tipc_peer(portref
, &addr
->addr
.id
);
401 tipc_ownidentity(portref
, &addr
->addr
.id
);
404 *uaddr_len
= sizeof(*addr
);
405 addr
->addrtype
= TIPC_ADDR_ID
;
406 addr
->family
= AF_TIPC
;
408 addr
->addr
.name
.domain
= 0;
414 * poll - read and possibly block on pollmask
415 * @file: file structure associated with the socket
416 * @sock: socket for which to calculate the poll bits
419 * Returns pollmask value
422 * It appears that the usual socket locking mechanisms are not useful here
423 * since the pollmask info is potentially out-of-date the moment this routine
424 * exits. TCP and other protocols seem to rely on higher level poll routines
425 * to handle any preventable race conditions, so TIPC will do the same ...
427 * TIPC sets the returned events as follows:
428 * a) POLLRDNORM and POLLIN are set if the socket's receive queue is non-empty
429 * or if a connection-oriented socket is does not have an active connection
430 * (i.e. a read operation will not block).
431 * b) POLLOUT is set except when a socket's connection has been terminated
432 * (i.e. a write operation will not block).
433 * c) POLLHUP is set when a socket's connection has been terminated.
435 * IMPORTANT: The fact that a read or write operation will not block does NOT
436 * imply that the operation will succeed!
439 static unsigned int poll(struct file
*file
, struct socket
*sock
,
442 struct sock
*sk
= sock
->sk
;
445 poll_wait(file
, sk
->sk_sleep
, wait
);
447 if (!skb_queue_empty(&sk
->sk_receive_queue
) ||
448 (sock
->state
== SS_UNCONNECTED
) ||
449 (sock
->state
== SS_DISCONNECTING
))
450 mask
= (POLLRDNORM
| POLLIN
);
454 if (sock
->state
== SS_DISCONNECTING
)
463 * dest_name_check - verify user is permitted to send to specified port name
464 * @dest: destination address
465 * @m: descriptor for message to be sent
467 * Prevents restricted configuration commands from being issued by
468 * unauthorized users.
470 * Returns 0 if permission is granted, otherwise errno
473 static int dest_name_check(struct sockaddr_tipc
*dest
, struct msghdr
*m
)
475 struct tipc_cfg_msg_hdr hdr
;
477 if (likely(dest
->addr
.name
.name
.type
>= TIPC_RESERVED_TYPES
))
479 if (likely(dest
->addr
.name
.name
.type
== TIPC_TOP_SRV
))
481 if (likely(dest
->addr
.name
.name
.type
!= TIPC_CFG_SRV
))
484 if (copy_from_user(&hdr
, m
->msg_iov
[0].iov_base
, sizeof(hdr
)))
486 if ((ntohs(hdr
.tcm_type
) & 0xC000) && (!capable(CAP_NET_ADMIN
)))
493 * send_msg - send message in connectionless manner
494 * @iocb: if NULL, indicates that socket lock is already held
495 * @sock: socket structure
496 * @m: message to send
497 * @total_len: length of message
499 * Message must have an destination specified explicitly.
500 * Used for SOCK_RDM and SOCK_DGRAM messages,
501 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
502 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
504 * Returns the number of bytes sent on success, or errno otherwise
507 static int send_msg(struct kiocb
*iocb
, struct socket
*sock
,
508 struct msghdr
*m
, size_t total_len
)
510 struct sock
*sk
= sock
->sk
;
511 struct tipc_port
*tport
= tipc_sk_port(sk
);
512 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
517 return -EDESTADDRREQ
;
518 if (unlikely((m
->msg_namelen
< sizeof(*dest
)) ||
519 (dest
->family
!= AF_TIPC
)))
525 needs_conn
= (sock
->state
!= SS_READY
);
526 if (unlikely(needs_conn
)) {
527 if (sock
->state
== SS_LISTENING
) {
531 if (sock
->state
!= SS_UNCONNECTED
) {
535 if ((tport
->published
) ||
536 ((sock
->type
== SOCK_STREAM
) && (total_len
!= 0))) {
540 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
541 tport
->conn_type
= dest
->addr
.name
.name
.type
;
542 tport
->conn_instance
= dest
->addr
.name
.name
.instance
;
545 /* Abort any pending connection attempts (very unlikely) */
551 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
552 if ((res
= dest_name_check(dest
, m
)))
554 res
= tipc_send2name(tport
->ref
,
555 &dest
->addr
.name
.name
,
556 dest
->addr
.name
.domain
,
560 else if (dest
->addrtype
== TIPC_ADDR_ID
) {
561 res
= tipc_send2port(tport
->ref
,
566 else if (dest
->addrtype
== TIPC_ADDR_MCAST
) {
571 if ((res
= dest_name_check(dest
, m
)))
573 res
= tipc_multicast(tport
->ref
,
579 if (likely(res
!= -ELINKCONG
)) {
580 if (needs_conn
&& (res
>= 0)) {
581 sock
->state
= SS_CONNECTING
;
585 if (m
->msg_flags
& MSG_DONTWAIT
) {
590 res
= wait_event_interruptible(*sk
->sk_sleep
,
604 * send_packet - send a connection-oriented message
605 * @iocb: if NULL, indicates that socket lock is already held
606 * @sock: socket structure
607 * @m: message to send
608 * @total_len: length of message
610 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
612 * Returns the number of bytes sent on success, or errno otherwise
615 static int send_packet(struct kiocb
*iocb
, struct socket
*sock
,
616 struct msghdr
*m
, size_t total_len
)
618 struct sock
*sk
= sock
->sk
;
619 struct tipc_port
*tport
= tipc_sk_port(sk
);
620 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
623 /* Handle implied connection establishment */
626 return send_msg(iocb
, sock
, m
, total_len
);
632 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
633 if (sock
->state
== SS_DISCONNECTING
)
640 res
= tipc_send(tport
->ref
, m
->msg_iovlen
, m
->msg_iov
);
641 if (likely(res
!= -ELINKCONG
)) {
644 if (m
->msg_flags
& MSG_DONTWAIT
) {
649 res
= wait_event_interruptible(*sk
->sk_sleep
,
650 (!tport
->congested
|| !tport
->connected
));
662 * send_stream - send stream-oriented data
664 * @sock: socket structure
666 * @total_len: total length of data to be sent
668 * Used for SOCK_STREAM data.
670 * Returns the number of bytes sent on success (or partial success),
671 * or errno if no data sent
674 static int send_stream(struct kiocb
*iocb
, struct socket
*sock
,
675 struct msghdr
*m
, size_t total_len
)
677 struct sock
*sk
= sock
->sk
;
678 struct tipc_port
*tport
= tipc_sk_port(sk
);
679 struct msghdr my_msg
;
681 struct iovec
*curr_iov
;
683 char __user
*curr_start
;
692 /* Handle special cases where there is no connection */
694 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
695 if (sock
->state
== SS_UNCONNECTED
) {
696 res
= send_packet(NULL
, sock
, m
, total_len
);
698 } else if (sock
->state
== SS_DISCONNECTING
) {
707 if (unlikely(m
->msg_name
)) {
713 * Send each iovec entry using one or more messages
715 * Note: This algorithm is good for the most likely case
716 * (i.e. one large iovec entry), but could be improved to pass sets
717 * of small iovec entries into send_packet().
720 curr_iov
= m
->msg_iov
;
721 curr_iovlen
= m
->msg_iovlen
;
722 my_msg
.msg_iov
= &my_iov
;
723 my_msg
.msg_iovlen
= 1;
724 my_msg
.msg_flags
= m
->msg_flags
;
725 my_msg
.msg_name
= NULL
;
728 hdr_size
= msg_hdr_sz(&tport
->phdr
);
730 while (curr_iovlen
--) {
731 curr_start
= curr_iov
->iov_base
;
732 curr_left
= curr_iov
->iov_len
;
735 bytes_to_send
= tport
->max_pkt
- hdr_size
;
736 if (bytes_to_send
> TIPC_MAX_USER_MSG_SIZE
)
737 bytes_to_send
= TIPC_MAX_USER_MSG_SIZE
;
738 if (curr_left
< bytes_to_send
)
739 bytes_to_send
= curr_left
;
740 my_iov
.iov_base
= curr_start
;
741 my_iov
.iov_len
= bytes_to_send
;
742 if ((res
= send_packet(NULL
, sock
, &my_msg
, 0)) < 0) {
747 curr_left
-= bytes_to_send
;
748 curr_start
+= bytes_to_send
;
749 bytes_sent
+= bytes_to_send
;
761 * auto_connect - complete connection setup to a remote port
762 * @sock: socket structure
763 * @msg: peer's response message
765 * Returns 0 on success, errno otherwise
768 static int auto_connect(struct socket
*sock
, struct tipc_msg
*msg
)
770 struct tipc_port
*tport
= tipc_sk_port(sock
->sk
);
771 struct tipc_portid peer
;
773 if (msg_errcode(msg
)) {
774 sock
->state
= SS_DISCONNECTING
;
775 return -ECONNREFUSED
;
778 peer
.ref
= msg_origport(msg
);
779 peer
.node
= msg_orignode(msg
);
780 tipc_connect2port(tport
->ref
, &peer
);
781 tipc_set_portimportance(tport
->ref
, msg_importance(msg
));
782 sock
->state
= SS_CONNECTED
;
787 * set_orig_addr - capture sender's address for received message
788 * @m: descriptor for message info
789 * @msg: received message header
791 * Note: Address is not captured if not requested by receiver.
794 static void set_orig_addr(struct msghdr
*m
, struct tipc_msg
*msg
)
796 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)m
->msg_name
;
799 addr
->family
= AF_TIPC
;
800 addr
->addrtype
= TIPC_ADDR_ID
;
801 addr
->addr
.id
.ref
= msg_origport(msg
);
802 addr
->addr
.id
.node
= msg_orignode(msg
);
803 addr
->addr
.name
.domain
= 0; /* could leave uninitialized */
804 addr
->scope
= 0; /* could leave uninitialized */
805 m
->msg_namelen
= sizeof(struct sockaddr_tipc
);
810 * anc_data_recv - optionally capture ancillary data for received message
811 * @m: descriptor for message info
812 * @msg: received message header
813 * @tport: TIPC port associated with message
815 * Note: Ancillary data is not captured if not requested by receiver.
817 * Returns 0 if successful, otherwise errno
820 static int anc_data_recv(struct msghdr
*m
, struct tipc_msg
*msg
,
821 struct tipc_port
*tport
)
829 if (likely(m
->msg_controllen
== 0))
832 /* Optionally capture errored message object(s) */
834 err
= msg
? msg_errcode(msg
) : 0;
837 anc_data
[1] = msg_data_sz(msg
);
838 if ((res
= put_cmsg(m
, SOL_TIPC
, TIPC_ERRINFO
, 8, anc_data
)))
841 (res
= put_cmsg(m
, SOL_TIPC
, TIPC_RETDATA
, anc_data
[1],
846 /* Optionally capture message destination object */
848 dest_type
= msg
? msg_type(msg
) : TIPC_DIRECT_MSG
;
852 anc_data
[0] = msg_nametype(msg
);
853 anc_data
[1] = msg_namelower(msg
);
854 anc_data
[2] = msg_namelower(msg
);
858 anc_data
[0] = msg_nametype(msg
);
859 anc_data
[1] = msg_namelower(msg
);
860 anc_data
[2] = msg_nameupper(msg
);
863 has_name
= (tport
->conn_type
!= 0);
864 anc_data
[0] = tport
->conn_type
;
865 anc_data
[1] = tport
->conn_instance
;
866 anc_data
[2] = tport
->conn_instance
;
872 (res
= put_cmsg(m
, SOL_TIPC
, TIPC_DESTNAME
, 12, anc_data
)))
879 * recv_msg - receive packet-oriented message
881 * @m: descriptor for message info
882 * @buf_len: total size of user buffer area
883 * @flags: receive flags
885 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
886 * If the complete message doesn't fit in user area, truncate it.
888 * Returns size of returned message data, errno otherwise
891 static int recv_msg(struct kiocb
*iocb
, struct socket
*sock
,
892 struct msghdr
*m
, size_t buf_len
, int flags
)
894 struct sock
*sk
= sock
->sk
;
895 struct tipc_port
*tport
= tipc_sk_port(sk
);
897 struct tipc_msg
*msg
;
902 /* Catch invalid receive requests */
904 if (m
->msg_iovlen
!= 1)
905 return -EOPNOTSUPP
; /* Don't do multiple iovec entries yet */
907 if (unlikely(!buf_len
))
912 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
919 /* Look for a message in receive queue; wait if necessary */
921 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
922 if (sock
->state
== SS_DISCONNECTING
) {
926 if (flags
& MSG_DONTWAIT
) {
931 res
= wait_event_interruptible(*sk
->sk_sleep
,
932 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
933 (sock
->state
== SS_DISCONNECTING
)));
939 /* Look at first message in receive queue */
941 buf
= skb_peek(&sk
->sk_receive_queue
);
943 sz
= msg_data_sz(msg
);
944 err
= msg_errcode(msg
);
946 /* Complete connection setup for an implied connect */
948 if (unlikely(sock
->state
== SS_CONNECTING
)) {
949 res
= auto_connect(sock
, msg
);
954 /* Discard an empty non-errored message & try again */
956 if ((!sz
) && (!err
)) {
957 advance_rx_queue(sk
);
961 /* Capture sender's address (optional) */
963 set_orig_addr(m
, msg
);
965 /* Capture ancillary data (optional) */
967 res
= anc_data_recv(m
, msg
, tport
);
971 /* Capture message data (if valid) & compute return value (always) */
974 if (unlikely(buf_len
< sz
)) {
976 m
->msg_flags
|= MSG_TRUNC
;
978 if (unlikely(copy_to_user(m
->msg_iov
->iov_base
, msg_data(msg
),
985 if ((sock
->state
== SS_READY
) ||
986 ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
))
992 /* Consume received message (optional) */
994 if (likely(!(flags
& MSG_PEEK
))) {
995 if ((sock
->state
!= SS_READY
) &&
996 (++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
997 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
998 advance_rx_queue(sk
);
1006 * recv_stream - receive stream-oriented data
1008 * @m: descriptor for message info
1009 * @buf_len: total size of user buffer area
1010 * @flags: receive flags
1012 * Used for SOCK_STREAM messages only. If not enough data is available
1013 * will optionally wait for more; never truncates data.
1015 * Returns size of returned message data, errno otherwise
1018 static int recv_stream(struct kiocb
*iocb
, struct socket
*sock
,
1019 struct msghdr
*m
, size_t buf_len
, int flags
)
1021 struct sock
*sk
= sock
->sk
;
1022 struct tipc_port
*tport
= tipc_sk_port(sk
);
1023 struct sk_buff
*buf
;
1024 struct tipc_msg
*msg
;
1029 char __user
*crs
= m
->msg_iov
->iov_base
;
1030 unsigned char *buf_crs
;
1034 /* Catch invalid receive attempts */
1036 if (m
->msg_iovlen
!= 1)
1037 return -EOPNOTSUPP
; /* Don't do multiple iovec entries yet */
1039 if (unlikely(!buf_len
))
1044 if (unlikely((sock
->state
== SS_UNCONNECTED
) ||
1045 (sock
->state
== SS_CONNECTING
))) {
1052 /* Look for a message in receive queue; wait if necessary */
1054 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1055 if (sock
->state
== SS_DISCONNECTING
) {
1059 if (flags
& MSG_DONTWAIT
) {
1064 res
= wait_event_interruptible(*sk
->sk_sleep
,
1065 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1066 (sock
->state
== SS_DISCONNECTING
)));
1072 /* Look at first message in receive queue */
1074 buf
= skb_peek(&sk
->sk_receive_queue
);
1076 sz
= msg_data_sz(msg
);
1077 err
= msg_errcode(msg
);
1079 /* Discard an empty non-errored message & try again */
1081 if ((!sz
) && (!err
)) {
1082 advance_rx_queue(sk
);
1086 /* Optionally capture sender's address & ancillary data of first msg */
1088 if (sz_copied
== 0) {
1089 set_orig_addr(m
, msg
);
1090 res
= anc_data_recv(m
, msg
, tport
);
1095 /* Capture message data (if valid) & compute return value (always) */
1098 buf_crs
= (unsigned char *)(TIPC_SKB_CB(buf
)->handle
);
1099 sz
= (unsigned char *)msg
+ msg_size(msg
) - buf_crs
;
1101 needed
= (buf_len
- sz_copied
);
1102 sz_to_copy
= (sz
<= needed
) ? sz
: needed
;
1103 if (unlikely(copy_to_user(crs
, buf_crs
, sz_to_copy
))) {
1107 sz_copied
+= sz_to_copy
;
1109 if (sz_to_copy
< sz
) {
1110 if (!(flags
& MSG_PEEK
))
1111 TIPC_SKB_CB(buf
)->handle
= buf_crs
+ sz_to_copy
;
1118 goto exit
; /* can't add error msg to valid data */
1120 if ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
)
1126 /* Consume received message (optional) */
1128 if (likely(!(flags
& MSG_PEEK
))) {
1129 if (unlikely(++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
1130 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
1131 advance_rx_queue(sk
);
1134 /* Loop around if more data is required */
1136 if ((sz_copied
< buf_len
) /* didn't get all requested data */
1137 && (!skb_queue_empty(&sock
->sk
->sk_receive_queue
) ||
1138 (flags
& MSG_WAITALL
))
1139 /* ... and more is ready or required */
1140 && (!(flags
& MSG_PEEK
)) /* ... and aren't just peeking at data */
1141 && (!err
) /* ... and haven't reached a FIN */
1147 return sz_copied
? sz_copied
: res
;
1151 * rx_queue_full - determine if receive queue can accept another message
1152 * @msg: message to be added to queue
1153 * @queue_size: current size of queue
1154 * @base: nominal maximum size of queue
1156 * Returns 1 if queue is unable to accept message, 0 otherwise
1159 static int rx_queue_full(struct tipc_msg
*msg
, u32 queue_size
, u32 base
)
1162 u32 imp
= msg_importance(msg
);
1164 if (imp
== TIPC_LOW_IMPORTANCE
)
1166 else if (imp
== TIPC_MEDIUM_IMPORTANCE
)
1167 threshold
= base
* 2;
1168 else if (imp
== TIPC_HIGH_IMPORTANCE
)
1169 threshold
= base
* 100;
1173 if (msg_connected(msg
))
1176 return (queue_size
>= threshold
);
1180 * filter_rcv - validate incoming message
1184 * Enqueues message on receive queue if acceptable; optionally handles
1185 * disconnect indication for a connected socket.
1187 * Called with socket lock already taken; port lock may also be taken.
1189 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1192 static u32
filter_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1194 struct socket
*sock
= sk
->sk_socket
;
1195 struct tipc_msg
*msg
= buf_msg(buf
);
1198 /* Reject message if it is wrong sort of message for socket */
1201 * WOULD IT BE BETTER TO JUST DISCARD THESE MESSAGES INSTEAD?
1202 * "NO PORT" ISN'T REALLY THE RIGHT ERROR CODE, AND THERE MAY
1203 * BE SECURITY IMPLICATIONS INHERENT IN REJECTING INVALID TRAFFIC
1206 if (sock
->state
== SS_READY
) {
1207 if (msg_connected(msg
)) {
1208 msg_dbg(msg
, "dispatch filter 1\n");
1209 return TIPC_ERR_NO_PORT
;
1212 if (msg_mcast(msg
)) {
1213 msg_dbg(msg
, "dispatch filter 2\n");
1214 return TIPC_ERR_NO_PORT
;
1216 if (sock
->state
== SS_CONNECTED
) {
1217 if (!msg_connected(msg
)) {
1218 msg_dbg(msg
, "dispatch filter 3\n");
1219 return TIPC_ERR_NO_PORT
;
1222 else if (sock
->state
== SS_CONNECTING
) {
1223 if (!msg_connected(msg
) && (msg_errcode(msg
) == 0)) {
1224 msg_dbg(msg
, "dispatch filter 4\n");
1225 return TIPC_ERR_NO_PORT
;
1228 else if (sock
->state
== SS_LISTENING
) {
1229 if (msg_connected(msg
) || msg_errcode(msg
)) {
1230 msg_dbg(msg
, "dispatch filter 5\n");
1231 return TIPC_ERR_NO_PORT
;
1234 else if (sock
->state
== SS_DISCONNECTING
) {
1235 msg_dbg(msg
, "dispatch filter 6\n");
1236 return TIPC_ERR_NO_PORT
;
1238 else /* (sock->state == SS_UNCONNECTED) */ {
1239 if (msg_connected(msg
) || msg_errcode(msg
)) {
1240 msg_dbg(msg
, "dispatch filter 7\n");
1241 return TIPC_ERR_NO_PORT
;
1246 /* Reject message if there isn't room to queue it */
1248 recv_q_len
= (u32
)atomic_read(&tipc_queue_size
);
1249 if (unlikely(recv_q_len
>= OVERLOAD_LIMIT_BASE
)) {
1250 if (rx_queue_full(msg
, recv_q_len
, OVERLOAD_LIMIT_BASE
))
1251 return TIPC_ERR_OVERLOAD
;
1253 recv_q_len
= skb_queue_len(&sk
->sk_receive_queue
);
1254 if (unlikely(recv_q_len
>= (OVERLOAD_LIMIT_BASE
/ 2))) {
1255 if (rx_queue_full(msg
, recv_q_len
, OVERLOAD_LIMIT_BASE
/ 2))
1256 return TIPC_ERR_OVERLOAD
;
1259 /* Enqueue message (finally!) */
1261 msg_dbg(msg
, "<DISP<: ");
1262 TIPC_SKB_CB(buf
)->handle
= msg_data(msg
);
1263 atomic_inc(&tipc_queue_size
);
1264 __skb_queue_tail(&sk
->sk_receive_queue
, buf
);
1266 /* Initiate connection termination for an incoming 'FIN' */
1268 if (unlikely(msg_errcode(msg
) && (sock
->state
== SS_CONNECTED
))) {
1269 sock
->state
= SS_DISCONNECTING
;
1270 tipc_disconnect_port(tipc_sk_port(sk
));
1273 if (waitqueue_active(sk
->sk_sleep
))
1274 wake_up_interruptible(sk
->sk_sleep
);
1279 * backlog_rcv - handle incoming message from backlog queue
1283 * Caller must hold socket lock, but not port lock.
1288 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1292 res
= filter_rcv(sk
, buf
);
1294 tipc_reject_msg(buf
, res
);
1299 * dispatch - handle incoming message
1300 * @tport: TIPC port that received message
1303 * Called with port lock already taken.
1305 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1308 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
)
1310 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1314 * Process message if socket is unlocked; otherwise add to backlog queue
1316 * This code is based on sk_receive_skb(), but must be distinct from it
1317 * since a TIPC-specific filter/reject mechanism is utilized
1321 if (!sock_owned_by_user(sk
)) {
1322 res
= filter_rcv(sk
, buf
);
1324 sk_add_backlog(sk
, buf
);
1333 * wakeupdispatch - wake up port after congestion
1334 * @tport: port to wakeup
1336 * Called with port lock already taken.
1339 static void wakeupdispatch(struct tipc_port
*tport
)
1341 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1343 if (waitqueue_active(sk
->sk_sleep
))
1344 wake_up_interruptible(sk
->sk_sleep
);
1348 * connect - establish a connection to another TIPC port
1349 * @sock: socket structure
1350 * @dest: socket address for destination port
1351 * @destlen: size of socket address data structure
1352 * @flags: file-related flags associated with socket
1354 * Returns 0 on success, errno otherwise
1357 static int connect(struct socket
*sock
, struct sockaddr
*dest
, int destlen
,
1360 struct sock
*sk
= sock
->sk
;
1361 struct sockaddr_tipc
*dst
= (struct sockaddr_tipc
*)dest
;
1362 struct msghdr m
= {NULL
,};
1363 struct sk_buff
*buf
;
1364 struct tipc_msg
*msg
;
1369 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1371 if (sock
->state
== SS_READY
) {
1376 /* For now, TIPC does not support the non-blocking form of connect() */
1378 if (flags
& O_NONBLOCK
) {
1383 /* Issue Posix-compliant error code if socket is in the wrong state */
1385 if (sock
->state
== SS_LISTENING
) {
1389 if (sock
->state
== SS_CONNECTING
) {
1393 if (sock
->state
!= SS_UNCONNECTED
) {
1399 * Reject connection attempt using multicast address
1401 * Note: send_msg() validates the rest of the address fields,
1402 * so there's no need to do it here
1405 if (dst
->addrtype
== TIPC_ADDR_MCAST
) {
1410 /* Reject any messages already in receive queue (very unlikely) */
1412 reject_rx_queue(sk
);
1414 /* Send a 'SYN-' to destination */
1417 m
.msg_namelen
= destlen
;
1418 res
= send_msg(NULL
, sock
, &m
, 0);
1423 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1426 res
= wait_event_interruptible_timeout(*sk
->sk_sleep
,
1427 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1428 (sock
->state
!= SS_CONNECTING
)),
1433 buf
= skb_peek(&sk
->sk_receive_queue
);
1436 res
= auto_connect(sock
, msg
);
1438 if (!msg_data_sz(msg
))
1439 advance_rx_queue(sk
);
1442 if (sock
->state
== SS_CONNECTED
) {
1445 res
= -ECONNREFUSED
;
1452 ; /* leave "res" unchanged */
1453 sock
->state
= SS_DISCONNECTING
;
1462 * listen - allow socket to listen for incoming connections
1463 * @sock: socket structure
1466 * Returns 0 on success, errno otherwise
1469 static int listen(struct socket
*sock
, int len
)
1471 struct sock
*sk
= sock
->sk
;
1476 if (sock
->state
== SS_READY
)
1478 else if (sock
->state
!= SS_UNCONNECTED
)
1481 sock
->state
= SS_LISTENING
;
1490 * accept - wait for connection request
1491 * @sock: listening socket
1492 * @newsock: new socket that is to be connected
1493 * @flags: file-related flags associated with socket
1495 * Returns 0 on success, errno otherwise
1498 static int accept(struct socket
*sock
, struct socket
*new_sock
, int flags
)
1500 struct sock
*sk
= sock
->sk
;
1501 struct sk_buff
*buf
;
1506 if (sock
->state
== SS_READY
) {
1510 if (sock
->state
!= SS_LISTENING
) {
1515 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1516 if (flags
& O_NONBLOCK
) {
1521 res
= wait_event_interruptible(*sk
->sk_sleep
,
1522 (!skb_queue_empty(&sk
->sk_receive_queue
)));
1528 buf
= skb_peek(&sk
->sk_receive_queue
);
1530 res
= tipc_create(sock_net(sock
->sk
), new_sock
, 0);
1532 struct sock
*new_sk
= new_sock
->sk
;
1533 struct tipc_port
*new_tport
= tipc_sk_port(new_sk
);
1534 u32 new_ref
= new_tport
->ref
;
1535 struct tipc_portid id
;
1536 struct tipc_msg
*msg
= buf_msg(buf
);
1541 * Reject any stray messages received by new socket
1542 * before the socket lock was taken (very, very unlikely)
1545 reject_rx_queue(new_sk
);
1547 /* Connect new socket to it's peer */
1549 id
.ref
= msg_origport(msg
);
1550 id
.node
= msg_orignode(msg
);
1551 tipc_connect2port(new_ref
, &id
);
1552 new_sock
->state
= SS_CONNECTED
;
1554 tipc_set_portimportance(new_ref
, msg_importance(msg
));
1555 if (msg_named(msg
)) {
1556 new_tport
->conn_type
= msg_nametype(msg
);
1557 new_tport
->conn_instance
= msg_nameinst(msg
);
1561 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1562 * Respond to 'SYN+' by queuing it on new socket.
1565 msg_dbg(msg
,"<ACC<: ");
1566 if (!msg_data_sz(msg
)) {
1567 struct msghdr m
= {NULL
,};
1569 advance_rx_queue(sk
);
1570 send_packet(NULL
, new_sock
, &m
, 0);
1572 __skb_dequeue(&sk
->sk_receive_queue
);
1573 __skb_queue_head(&new_sk
->sk_receive_queue
, buf
);
1575 release_sock(new_sk
);
1583 * shutdown - shutdown socket connection
1584 * @sock: socket structure
1585 * @how: direction to close (must be SHUT_RDWR)
1587 * Terminates connection (if necessary), then purges socket's receive queue.
1589 * Returns 0 on success, errno otherwise
1592 static int shutdown(struct socket
*sock
, int how
)
1594 struct sock
*sk
= sock
->sk
;
1595 struct tipc_port
*tport
= tipc_sk_port(sk
);
1596 struct sk_buff
*buf
;
1599 if (how
!= SHUT_RDWR
)
1604 switch (sock
->state
) {
1608 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1610 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
1612 atomic_dec(&tipc_queue_size
);
1613 if (TIPC_SKB_CB(buf
)->handle
!= msg_data(buf_msg(buf
))) {
1617 tipc_disconnect(tport
->ref
);
1618 tipc_reject_msg(buf
, TIPC_CONN_SHUTDOWN
);
1620 tipc_shutdown(tport
->ref
);
1623 sock
->state
= SS_DISCONNECTING
;
1627 case SS_DISCONNECTING
:
1629 /* Discard any unreceived messages; wake up sleeping tasks */
1631 discard_rx_queue(sk
);
1632 if (waitqueue_active(sk
->sk_sleep
))
1633 wake_up_interruptible(sk
->sk_sleep
);
1646 * setsockopt - set socket option
1647 * @sock: socket structure
1648 * @lvl: option level
1649 * @opt: option identifier
1650 * @ov: pointer to new option value
1651 * @ol: length of option value
1653 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1654 * (to ease compatibility).
1656 * Returns 0 on success, errno otherwise
1659 static int setsockopt(struct socket
*sock
,
1660 int lvl
, int opt
, char __user
*ov
, int ol
)
1662 struct sock
*sk
= sock
->sk
;
1663 struct tipc_port
*tport
= tipc_sk_port(sk
);
1667 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1669 if (lvl
!= SOL_TIPC
)
1670 return -ENOPROTOOPT
;
1671 if (ol
< sizeof(value
))
1673 if ((res
= get_user(value
, (u32 __user
*)ov
)))
1679 case TIPC_IMPORTANCE
:
1680 res
= tipc_set_portimportance(tport
->ref
, value
);
1682 case TIPC_SRC_DROPPABLE
:
1683 if (sock
->type
!= SOCK_STREAM
)
1684 res
= tipc_set_portunreliable(tport
->ref
, value
);
1688 case TIPC_DEST_DROPPABLE
:
1689 res
= tipc_set_portunreturnable(tport
->ref
, value
);
1691 case TIPC_CONN_TIMEOUT
:
1692 sk
->sk_rcvtimeo
= msecs_to_jiffies(value
);
1693 /* no need to set "res", since already 0 at this point */
1705 * getsockopt - get socket option
1706 * @sock: socket structure
1707 * @lvl: option level
1708 * @opt: option identifier
1709 * @ov: receptacle for option value
1710 * @ol: receptacle for length of option value
1712 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1713 * (to ease compatibility).
1715 * Returns 0 on success, errno otherwise
1718 static int getsockopt(struct socket
*sock
,
1719 int lvl
, int opt
, char __user
*ov
, int __user
*ol
)
1721 struct sock
*sk
= sock
->sk
;
1722 struct tipc_port
*tport
= tipc_sk_port(sk
);
1727 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1728 return put_user(0, ol
);
1729 if (lvl
!= SOL_TIPC
)
1730 return -ENOPROTOOPT
;
1731 if ((res
= get_user(len
, ol
)))
1737 case TIPC_IMPORTANCE
:
1738 res
= tipc_portimportance(tport
->ref
, &value
);
1740 case TIPC_SRC_DROPPABLE
:
1741 res
= tipc_portunreliable(tport
->ref
, &value
);
1743 case TIPC_DEST_DROPPABLE
:
1744 res
= tipc_portunreturnable(tport
->ref
, &value
);
1746 case TIPC_CONN_TIMEOUT
:
1747 value
= jiffies_to_msecs(sk
->sk_rcvtimeo
);
1748 /* no need to set "res", since already 0 at this point */
1759 else if (len
< sizeof(value
)) {
1762 else if (copy_to_user(ov
, &value
, sizeof(value
))) {
1766 res
= put_user(sizeof(value
), ol
);
1773 * Protocol switches for the various types of TIPC sockets
1776 static const struct proto_ops msg_ops
= {
1777 .owner
= THIS_MODULE
,
1782 .socketpair
= sock_no_socketpair
,
1784 .getname
= get_name
,
1786 .ioctl
= sock_no_ioctl
,
1788 .shutdown
= shutdown
,
1789 .setsockopt
= setsockopt
,
1790 .getsockopt
= getsockopt
,
1791 .sendmsg
= send_msg
,
1792 .recvmsg
= recv_msg
,
1793 .mmap
= sock_no_mmap
,
1794 .sendpage
= sock_no_sendpage
1797 static const struct proto_ops packet_ops
= {
1798 .owner
= THIS_MODULE
,
1803 .socketpair
= sock_no_socketpair
,
1805 .getname
= get_name
,
1807 .ioctl
= sock_no_ioctl
,
1809 .shutdown
= shutdown
,
1810 .setsockopt
= setsockopt
,
1811 .getsockopt
= getsockopt
,
1812 .sendmsg
= send_packet
,
1813 .recvmsg
= recv_msg
,
1814 .mmap
= sock_no_mmap
,
1815 .sendpage
= sock_no_sendpage
1818 static const struct proto_ops stream_ops
= {
1819 .owner
= THIS_MODULE
,
1824 .socketpair
= sock_no_socketpair
,
1826 .getname
= get_name
,
1828 .ioctl
= sock_no_ioctl
,
1830 .shutdown
= shutdown
,
1831 .setsockopt
= setsockopt
,
1832 .getsockopt
= getsockopt
,
1833 .sendmsg
= send_stream
,
1834 .recvmsg
= recv_stream
,
1835 .mmap
= sock_no_mmap
,
1836 .sendpage
= sock_no_sendpage
1839 static const struct net_proto_family tipc_family_ops
= {
1840 .owner
= THIS_MODULE
,
1842 .create
= tipc_create
1845 static struct proto tipc_proto
= {
1847 .owner
= THIS_MODULE
,
1848 .obj_size
= sizeof(struct tipc_sock
)
1852 * tipc_socket_init - initialize TIPC socket interface
1854 * Returns 0 on success, errno otherwise
1856 int tipc_socket_init(void)
1860 res
= proto_register(&tipc_proto
, 1);
1862 err("Failed to register TIPC protocol type\n");
1866 res
= sock_register(&tipc_family_ops
);
1868 err("Failed to register TIPC socket type\n");
1869 proto_unregister(&tipc_proto
);
1873 sockets_enabled
= 1;
1879 * tipc_socket_stop - stop TIPC socket interface
1882 void tipc_socket_stop(void)
1884 if (!sockets_enabled
)
1887 sockets_enabled
= 0;
1888 sock_unregister(tipc_family_ops
.family
);
1889 proto_unregister(&tipc_proto
);