2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2011, 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.
40 #include <linux/export.h>
43 #define SS_LISTENING -1 /* socket is listening */
44 #define SS_READY -2 /* socket is connectionless */
46 #define OVERLOAD_LIMIT_BASE 5000
47 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
52 struct tipc_portid peer_name
;
53 unsigned int conn_timeout
;
56 #define tipc_sk(sk) ((struct tipc_sock *)(sk))
57 #define tipc_sk_port(sk) (tipc_sk(sk)->p)
59 #define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
60 (sock->state == SS_DISCONNECTING))
62 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
63 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
);
64 static void wakeupdispatch(struct tipc_port
*tport
);
66 static const struct proto_ops packet_ops
;
67 static const struct proto_ops stream_ops
;
68 static const struct proto_ops msg_ops
;
70 static struct proto tipc_proto
;
72 static int sockets_enabled
;
74 static atomic_t tipc_queue_size
= ATOMIC_INIT(0);
77 * Revised TIPC socket locking policy:
79 * Most socket operations take the standard socket lock when they start
80 * and hold it until they finish (or until they need to sleep). Acquiring
81 * this lock grants the owner exclusive access to the fields of the socket
82 * data structures, with the exception of the backlog queue. A few socket
83 * operations can be done without taking the socket lock because they only
84 * read socket information that never changes during the life of the socket.
86 * Socket operations may acquire the lock for the associated TIPC port if they
87 * need to perform an operation on the port. If any routine needs to acquire
88 * both the socket lock and the port lock it must take the socket lock first
89 * to avoid the risk of deadlock.
91 * The dispatcher handling incoming messages cannot grab the socket lock in
92 * the standard fashion, since invoked it runs at the BH level and cannot block.
93 * Instead, it checks to see if the socket lock is currently owned by someone,
94 * and either handles the message itself or adds it to the socket's backlog
95 * queue; in the latter case the queued message is processed once the process
96 * owning the socket lock releases it.
98 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
99 * the problem of a blocked socket operation preventing any other operations
100 * from occurring. However, applications must be careful if they have
101 * multiple threads trying to send (or receive) on the same socket, as these
102 * operations might interfere with each other. For example, doing a connect
103 * and a receive at the same time might allow the receive to consume the
104 * ACK message meant for the connect. While additional work could be done
105 * to try and overcome this, it doesn't seem to be worthwhile at the present.
107 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
108 * that another operation that must be performed in a non-blocking manner is
109 * not delayed for very long because the lock has already been taken.
111 * NOTE: This code assumes that certain fields of a port/socket pair are
112 * constant over its lifetime; such fields can be examined without taking
113 * the socket lock and/or port lock, and do not need to be re-read even
114 * after resuming processing after waiting. These fields include:
116 * - pointer to socket sk structure (aka tipc_sock structure)
117 * - pointer to port structure
122 * advance_rx_queue - discard first buffer in socket receive queue
124 * Caller must hold socket lock
126 static void advance_rx_queue(struct sock
*sk
)
128 kfree_skb(__skb_dequeue(&sk
->sk_receive_queue
));
129 atomic_dec(&tipc_queue_size
);
133 * discard_rx_queue - discard all buffers in socket receive queue
135 * Caller must hold socket lock
137 static void discard_rx_queue(struct sock
*sk
)
141 while ((buf
= __skb_dequeue(&sk
->sk_receive_queue
))) {
142 atomic_dec(&tipc_queue_size
);
148 * reject_rx_queue - reject all buffers in socket receive queue
150 * Caller must hold socket lock
152 static void reject_rx_queue(struct sock
*sk
)
156 while ((buf
= __skb_dequeue(&sk
->sk_receive_queue
))) {
157 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
158 atomic_dec(&tipc_queue_size
);
163 * tipc_create - create a TIPC socket
164 * @net: network namespace (must be default network)
165 * @sock: pre-allocated socket structure
166 * @protocol: protocol indicator (must be 0)
167 * @kern: caused by kernel or by userspace?
169 * This routine creates additional data structures used by the TIPC socket,
170 * initializes them, and links them together.
172 * Returns 0 on success, errno otherwise
174 static int tipc_create(struct net
*net
, struct socket
*sock
, int protocol
,
177 const struct proto_ops
*ops
;
180 struct tipc_port
*tp_ptr
;
182 /* Validate arguments */
183 if (unlikely(protocol
!= 0))
184 return -EPROTONOSUPPORT
;
186 switch (sock
->type
) {
189 state
= SS_UNCONNECTED
;
193 state
= SS_UNCONNECTED
;
204 /* Allocate socket's protocol area */
205 sk
= sk_alloc(net
, AF_TIPC
, GFP_KERNEL
, &tipc_proto
);
209 /* Allocate TIPC port for socket to use */
210 tp_ptr
= tipc_createport_raw(sk
, &dispatch
, &wakeupdispatch
,
211 TIPC_LOW_IMPORTANCE
);
212 if (unlikely(!tp_ptr
)) {
217 /* Finish initializing socket data structures */
221 sock_init_data(sock
, sk
);
222 sk
->sk_backlog_rcv
= backlog_rcv
;
223 tipc_sk(sk
)->p
= tp_ptr
;
224 tipc_sk(sk
)->conn_timeout
= CONN_TIMEOUT_DEFAULT
;
226 spin_unlock_bh(tp_ptr
->lock
);
228 if (sock
->state
== SS_READY
) {
229 tipc_set_portunreturnable(tp_ptr
->ref
, 1);
230 if (sock
->type
== SOCK_DGRAM
)
231 tipc_set_portunreliable(tp_ptr
->ref
, 1);
238 * release - destroy a TIPC socket
239 * @sock: socket to destroy
241 * This routine cleans up any messages that are still queued on the socket.
242 * For DGRAM and RDM socket types, all queued messages are rejected.
243 * For SEQPACKET and STREAM socket types, the first message is rejected
244 * and any others are discarded. (If the first message on a STREAM socket
245 * is partially-read, it is discarded and the next one is rejected instead.)
247 * NOTE: Rejected messages are not necessarily returned to the sender! They
248 * are returned or discarded according to the "destination droppable" setting
249 * specified for the message by the sender.
251 * Returns 0 on success, errno otherwise
253 static int release(struct socket
*sock
)
255 struct sock
*sk
= sock
->sk
;
256 struct tipc_port
*tport
;
261 * Exit if socket isn't fully initialized (occurs when a failed accept()
262 * releases a pre-allocated child socket that was never used)
267 tport
= tipc_sk_port(sk
);
271 * Reject all unreceived messages, except on an active connection
272 * (which disconnects locally & sends a 'FIN+' to peer)
274 while (sock
->state
!= SS_DISCONNECTING
) {
275 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
278 atomic_dec(&tipc_queue_size
);
279 if (TIPC_SKB_CB(buf
)->handle
!= 0)
282 if ((sock
->state
== SS_CONNECTING
) ||
283 (sock
->state
== SS_CONNECTED
)) {
284 sock
->state
= SS_DISCONNECTING
;
285 tipc_disconnect(tport
->ref
);
287 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
292 * Delete TIPC port; this ensures no more messages are queued
293 * (also disconnects an active connection & sends a 'FIN-' to peer)
295 res
= tipc_deleteport(tport
->ref
);
297 /* Discard any remaining (connection-based) messages in receive queue */
298 discard_rx_queue(sk
);
300 /* Reject any messages that accumulated in backlog queue */
301 sock
->state
= SS_DISCONNECTING
;
311 * bind - associate or disassocate TIPC name(s) with a socket
312 * @sock: socket structure
313 * @uaddr: socket address describing name(s) and desired operation
314 * @uaddr_len: size of socket address data structure
316 * Name and name sequence binding is indicated using a positive scope value;
317 * a negative scope value unbinds the specified name. Specifying no name
318 * (i.e. a socket address length of 0) unbinds all names from the socket.
320 * Returns 0 on success, errno otherwise
322 * NOTE: This routine doesn't need to take the socket lock since it doesn't
323 * access any non-constant socket information.
325 static int bind(struct socket
*sock
, struct sockaddr
*uaddr
, int uaddr_len
)
327 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
328 u32 portref
= tipc_sk_port(sock
->sk
)->ref
;
330 if (unlikely(!uaddr_len
))
331 return tipc_withdraw(portref
, 0, NULL
);
333 if (uaddr_len
< sizeof(struct sockaddr_tipc
))
335 if (addr
->family
!= AF_TIPC
)
336 return -EAFNOSUPPORT
;
338 if (addr
->addrtype
== TIPC_ADDR_NAME
)
339 addr
->addr
.nameseq
.upper
= addr
->addr
.nameseq
.lower
;
340 else if (addr
->addrtype
!= TIPC_ADDR_NAMESEQ
)
341 return -EAFNOSUPPORT
;
343 if (addr
->addr
.nameseq
.type
< TIPC_RESERVED_TYPES
)
346 return (addr
->scope
> 0) ?
347 tipc_publish(portref
, addr
->scope
, &addr
->addr
.nameseq
) :
348 tipc_withdraw(portref
, -addr
->scope
, &addr
->addr
.nameseq
);
352 * get_name - get port ID of socket or peer socket
353 * @sock: socket structure
354 * @uaddr: area for returned socket address
355 * @uaddr_len: area for returned length of socket address
356 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
358 * Returns 0 on success, errno otherwise
360 * NOTE: This routine doesn't need to take the socket lock since it only
361 * accesses socket information that is unchanging (or which changes in
362 * a completely predictable manner).
364 static int get_name(struct socket
*sock
, struct sockaddr
*uaddr
,
365 int *uaddr_len
, int peer
)
367 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
368 struct tipc_sock
*tsock
= tipc_sk(sock
->sk
);
370 memset(addr
, 0, sizeof(*addr
));
372 if ((sock
->state
!= SS_CONNECTED
) &&
373 ((peer
!= 2) || (sock
->state
!= SS_DISCONNECTING
)))
375 addr
->addr
.id
.ref
= tsock
->peer_name
.ref
;
376 addr
->addr
.id
.node
= tsock
->peer_name
.node
;
378 addr
->addr
.id
.ref
= tsock
->p
->ref
;
379 addr
->addr
.id
.node
= tipc_own_addr
;
382 *uaddr_len
= sizeof(*addr
);
383 addr
->addrtype
= TIPC_ADDR_ID
;
384 addr
->family
= AF_TIPC
;
386 addr
->addr
.name
.domain
= 0;
392 * poll - read and possibly block on pollmask
393 * @file: file structure associated with the socket
394 * @sock: socket for which to calculate the poll bits
397 * Returns pollmask value
400 * It appears that the usual socket locking mechanisms are not useful here
401 * since the pollmask info is potentially out-of-date the moment this routine
402 * exits. TCP and other protocols seem to rely on higher level poll routines
403 * to handle any preventable race conditions, so TIPC will do the same ...
405 * TIPC sets the returned events as follows:
407 * socket state flags set
408 * ------------ ---------
409 * unconnected no read flags
412 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
415 * connected POLLIN/POLLRDNORM if data in rx queue
416 * POLLOUT if port is not congested
418 * disconnecting POLLIN/POLLRDNORM/POLLHUP
421 * listening POLLIN if SYN in rx queue
424 * ready POLLIN/POLLRDNORM if data in rx queue
425 * [connectionless] POLLOUT (since port cannot be congested)
427 * IMPORTANT: The fact that a read or write operation is indicated does NOT
428 * imply that the operation will succeed, merely that it should be performed
429 * and will not block.
431 static unsigned int poll(struct file
*file
, struct socket
*sock
,
434 struct sock
*sk
= sock
->sk
;
437 poll_wait(file
, sk_sleep(sk
), wait
);
439 switch ((int)sock
->state
) {
442 if (!tipc_sk_port(sk
)->congested
)
447 if (!skb_queue_empty(&sk
->sk_receive_queue
))
448 mask
|= (POLLIN
| POLLRDNORM
);
450 case SS_DISCONNECTING
:
451 mask
= (POLLIN
| POLLRDNORM
| POLLHUP
);
459 * dest_name_check - verify user is permitted to send to specified port name
460 * @dest: destination address
461 * @m: descriptor for message to be sent
463 * Prevents restricted configuration commands from being issued by
464 * unauthorized users.
466 * Returns 0 if permission is granted, otherwise errno
468 static int dest_name_check(struct sockaddr_tipc
*dest
, struct msghdr
*m
)
470 struct tipc_cfg_msg_hdr hdr
;
472 if (likely(dest
->addr
.name
.name
.type
>= TIPC_RESERVED_TYPES
))
474 if (likely(dest
->addr
.name
.name
.type
== TIPC_TOP_SRV
))
476 if (likely(dest
->addr
.name
.name
.type
!= TIPC_CFG_SRV
))
479 if (!m
->msg_iovlen
|| (m
->msg_iov
[0].iov_len
< sizeof(hdr
)))
481 if (copy_from_user(&hdr
, m
->msg_iov
[0].iov_base
, sizeof(hdr
)))
483 if ((ntohs(hdr
.tcm_type
) & 0xC000) && (!capable(CAP_NET_ADMIN
)))
490 * send_msg - send message in connectionless manner
491 * @iocb: if NULL, indicates that socket lock is already held
492 * @sock: socket structure
493 * @m: message to send
494 * @total_len: length of message
496 * Message must have an destination specified explicitly.
497 * Used for SOCK_RDM and SOCK_DGRAM messages,
498 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
499 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
501 * Returns the number of bytes sent on success, or errno otherwise
503 static int send_msg(struct kiocb
*iocb
, struct socket
*sock
,
504 struct msghdr
*m
, size_t total_len
)
506 struct sock
*sk
= sock
->sk
;
507 struct tipc_port
*tport
= tipc_sk_port(sk
);
508 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
514 return -EDESTADDRREQ
;
515 if (unlikely((m
->msg_namelen
< sizeof(*dest
)) ||
516 (dest
->family
!= AF_TIPC
)))
518 if ((total_len
> TIPC_MAX_USER_MSG_SIZE
) ||
519 (m
->msg_iovlen
> (unsigned int)INT_MAX
))
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) */
549 timeout_val
= sock_sndtimeo(sk
, m
->msg_flags
& MSG_DONTWAIT
);
552 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
553 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 res
= dest_name_check(dest
, m
);
576 res
= tipc_multicast(tport
->ref
,
582 if (likely(res
!= -ELINKCONG
)) {
583 if (needs_conn
&& (res
>= 0))
584 sock
->state
= SS_CONNECTING
;
587 if (timeout_val
<= 0L) {
588 res
= timeout_val
? timeout_val
: -EWOULDBLOCK
;
592 timeout_val
= wait_event_interruptible_timeout(*sk_sleep(sk
),
593 !tport
->congested
, timeout_val
);
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
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
;
623 /* Handle implied connection establishment */
625 return send_msg(iocb
, sock
, m
, total_len
);
627 if ((total_len
> TIPC_MAX_USER_MSG_SIZE
) ||
628 (m
->msg_iovlen
> (unsigned int)INT_MAX
))
634 timeout_val
= sock_sndtimeo(sk
, m
->msg_flags
& MSG_DONTWAIT
);
637 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
638 if (sock
->state
== SS_DISCONNECTING
)
645 res
= tipc_send(tport
->ref
, m
->msg_iovlen
, m
->msg_iov
,
647 if (likely(res
!= -ELINKCONG
))
649 if (timeout_val
<= 0L) {
650 res
= timeout_val
? timeout_val
: -EWOULDBLOCK
;
654 timeout_val
= wait_event_interruptible_timeout(*sk_sleep(sk
),
655 (!tport
->congested
|| !tport
->connected
), timeout_val
);
665 * send_stream - send stream-oriented data
667 * @sock: socket structure
669 * @total_len: total length of data to be sent
671 * Used for SOCK_STREAM data.
673 * Returns the number of bytes sent on success (or partial success),
674 * 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 */
695 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
696 if (sock
->state
== SS_UNCONNECTED
) {
697 res
= send_packet(NULL
, sock
, m
, total_len
);
699 } else if (sock
->state
== SS_DISCONNECTING
) {
708 if (unlikely(m
->msg_name
)) {
713 if ((total_len
> (unsigned int)INT_MAX
) ||
714 (m
->msg_iovlen
> (unsigned int)INT_MAX
)) {
720 * Send each iovec entry using one or more messages
722 * Note: This algorithm is good for the most likely case
723 * (i.e. one large iovec entry), but could be improved to pass sets
724 * of small iovec entries into send_packet().
726 curr_iov
= m
->msg_iov
;
727 curr_iovlen
= m
->msg_iovlen
;
728 my_msg
.msg_iov
= &my_iov
;
729 my_msg
.msg_iovlen
= 1;
730 my_msg
.msg_flags
= m
->msg_flags
;
731 my_msg
.msg_name
= NULL
;
734 hdr_size
= msg_hdr_sz(&tport
->phdr
);
736 while (curr_iovlen
--) {
737 curr_start
= curr_iov
->iov_base
;
738 curr_left
= curr_iov
->iov_len
;
741 bytes_to_send
= tport
->max_pkt
- hdr_size
;
742 if (bytes_to_send
> TIPC_MAX_USER_MSG_SIZE
)
743 bytes_to_send
= TIPC_MAX_USER_MSG_SIZE
;
744 if (curr_left
< bytes_to_send
)
745 bytes_to_send
= curr_left
;
746 my_iov
.iov_base
= curr_start
;
747 my_iov
.iov_len
= bytes_to_send
;
748 res
= send_packet(NULL
, sock
, &my_msg
, bytes_to_send
);
754 curr_left
-= bytes_to_send
;
755 curr_start
+= bytes_to_send
;
756 bytes_sent
+= bytes_to_send
;
768 * auto_connect - complete connection setup to a remote port
769 * @sock: socket structure
770 * @msg: peer's response message
772 * Returns 0 on success, errno otherwise
774 static int auto_connect(struct socket
*sock
, struct tipc_msg
*msg
)
776 struct tipc_sock
*tsock
= tipc_sk(sock
->sk
);
778 if (msg_errcode(msg
)) {
779 sock
->state
= SS_DISCONNECTING
;
780 return -ECONNREFUSED
;
783 tsock
->peer_name
.ref
= msg_origport(msg
);
784 tsock
->peer_name
.node
= msg_orignode(msg
);
785 tipc_connect2port(tsock
->p
->ref
, &tsock
->peer_name
);
786 tipc_set_portimportance(tsock
->p
->ref
, msg_importance(msg
));
787 sock
->state
= SS_CONNECTED
;
792 * set_orig_addr - capture sender's address for received message
793 * @m: descriptor for message info
794 * @msg: received message header
796 * Note: Address is not captured if not requested by receiver.
798 static void set_orig_addr(struct msghdr
*m
, struct tipc_msg
*msg
)
800 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)m
->msg_name
;
803 addr
->family
= AF_TIPC
;
804 addr
->addrtype
= TIPC_ADDR_ID
;
805 addr
->addr
.id
.ref
= msg_origport(msg
);
806 addr
->addr
.id
.node
= msg_orignode(msg
);
807 addr
->addr
.name
.domain
= 0; /* could leave uninitialized */
808 addr
->scope
= 0; /* could leave uninitialized */
809 m
->msg_namelen
= sizeof(struct sockaddr_tipc
);
814 * anc_data_recv - optionally capture ancillary data for received message
815 * @m: descriptor for message info
816 * @msg: received message header
817 * @tport: TIPC port associated with message
819 * Note: Ancillary data is not captured if not requested by receiver.
821 * Returns 0 if successful, otherwise errno
823 static int anc_data_recv(struct msghdr
*m
, struct tipc_msg
*msg
,
824 struct tipc_port
*tport
)
832 if (likely(m
->msg_controllen
== 0))
835 /* Optionally capture errored message object(s) */
836 err
= msg
? msg_errcode(msg
) : 0;
839 anc_data
[1] = msg_data_sz(msg
);
840 res
= put_cmsg(m
, SOL_TIPC
, TIPC_ERRINFO
, 8, anc_data
);
844 res
= put_cmsg(m
, SOL_TIPC
, TIPC_RETDATA
, anc_data
[1],
851 /* Optionally capture message destination object */
852 dest_type
= msg
? msg_type(msg
) : TIPC_DIRECT_MSG
;
856 anc_data
[0] = msg_nametype(msg
);
857 anc_data
[1] = msg_namelower(msg
);
858 anc_data
[2] = msg_namelower(msg
);
862 anc_data
[0] = msg_nametype(msg
);
863 anc_data
[1] = msg_namelower(msg
);
864 anc_data
[2] = msg_nameupper(msg
);
867 has_name
= (tport
->conn_type
!= 0);
868 anc_data
[0] = tport
->conn_type
;
869 anc_data
[1] = tport
->conn_instance
;
870 anc_data
[2] = tport
->conn_instance
;
876 res
= put_cmsg(m
, SOL_TIPC
, TIPC_DESTNAME
, 12, anc_data
);
885 * recv_msg - receive packet-oriented message
887 * @m: descriptor for message info
888 * @buf_len: total size of user buffer area
889 * @flags: receive flags
891 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
892 * If the complete message doesn't fit in user area, truncate it.
894 * Returns size of returned message data, errno otherwise
896 static int recv_msg(struct kiocb
*iocb
, struct socket
*sock
,
897 struct msghdr
*m
, size_t buf_len
, int flags
)
899 struct sock
*sk
= sock
->sk
;
900 struct tipc_port
*tport
= tipc_sk_port(sk
);
902 struct tipc_msg
*msg
;
908 /* Catch invalid receive requests */
909 if (unlikely(!buf_len
))
914 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
919 timeout
= sock_rcvtimeo(sk
, flags
& MSG_DONTWAIT
);
922 /* Look for a message in receive queue; wait if necessary */
923 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
924 if (sock
->state
== SS_DISCONNECTING
) {
929 res
= timeout
? timeout
: -EWOULDBLOCK
;
933 timeout
= wait_event_interruptible_timeout(*sk_sleep(sk
),
939 /* 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 */
946 if (unlikely(sock
->state
== SS_CONNECTING
)) {
947 res
= auto_connect(sock
, msg
);
952 /* Discard an empty non-errored message & try again */
953 if ((!sz
) && (!err
)) {
954 advance_rx_queue(sk
);
958 /* Capture sender's address (optional) */
959 set_orig_addr(m
, msg
);
961 /* Capture ancillary data (optional) */
962 res
= anc_data_recv(m
, msg
, tport
);
966 /* Capture message data (if valid) & compute return value (always) */
968 if (unlikely(buf_len
< sz
)) {
970 m
->msg_flags
|= MSG_TRUNC
;
972 res
= skb_copy_datagram_iovec(buf
, msg_hdr_sz(msg
),
978 if ((sock
->state
== SS_READY
) ||
979 ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
))
985 /* Consume received message (optional) */
986 if (likely(!(flags
& MSG_PEEK
))) {
987 if ((sock
->state
!= SS_READY
) &&
988 (++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
989 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
990 advance_rx_queue(sk
);
998 * recv_stream - receive stream-oriented data
1000 * @m: descriptor for message info
1001 * @buf_len: total size of user buffer area
1002 * @flags: receive flags
1004 * Used for SOCK_STREAM messages only. If not enough data is available
1005 * will optionally wait for more; never truncates data.
1007 * Returns size of returned message data, errno otherwise
1009 static int recv_stream(struct kiocb
*iocb
, struct socket
*sock
,
1010 struct msghdr
*m
, size_t buf_len
, int flags
)
1012 struct sock
*sk
= sock
->sk
;
1013 struct tipc_port
*tport
= tipc_sk_port(sk
);
1014 struct sk_buff
*buf
;
1015 struct tipc_msg
*msg
;
1018 int sz_to_copy
, target
, needed
;
1023 /* Catch invalid receive attempts */
1024 if (unlikely(!buf_len
))
1029 if (unlikely((sock
->state
== SS_UNCONNECTED
) ||
1030 (sock
->state
== SS_CONNECTING
))) {
1035 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, buf_len
);
1036 timeout
= sock_rcvtimeo(sk
, flags
& MSG_DONTWAIT
);
1039 /* Look for a message in receive queue; wait if necessary */
1040 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1041 if (sock
->state
== SS_DISCONNECTING
) {
1045 if (timeout
<= 0L) {
1046 res
= timeout
? timeout
: -EWOULDBLOCK
;
1050 timeout
= wait_event_interruptible_timeout(*sk_sleep(sk
),
1051 tipc_rx_ready(sock
),
1056 /* Look at first message in receive queue */
1057 buf
= skb_peek(&sk
->sk_receive_queue
);
1059 sz
= msg_data_sz(msg
);
1060 err
= msg_errcode(msg
);
1062 /* Discard an empty non-errored message & try again */
1063 if ((!sz
) && (!err
)) {
1064 advance_rx_queue(sk
);
1068 /* Optionally capture sender's address & ancillary data of first msg */
1069 if (sz_copied
== 0) {
1070 set_orig_addr(m
, msg
);
1071 res
= anc_data_recv(m
, msg
, tport
);
1076 /* Capture message data (if valid) & compute return value (always) */
1078 u32 offset
= (u32
)(unsigned long)(TIPC_SKB_CB(buf
)->handle
);
1081 needed
= (buf_len
- sz_copied
);
1082 sz_to_copy
= (sz
<= needed
) ? sz
: needed
;
1084 res
= skb_copy_datagram_iovec(buf
, msg_hdr_sz(msg
) + offset
,
1085 m
->msg_iov
, sz_to_copy
);
1089 sz_copied
+= sz_to_copy
;
1091 if (sz_to_copy
< sz
) {
1092 if (!(flags
& MSG_PEEK
))
1093 TIPC_SKB_CB(buf
)->handle
=
1094 (void *)(unsigned long)(offset
+ sz_to_copy
);
1099 goto exit
; /* can't add error msg to valid data */
1101 if ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
)
1107 /* Consume received message (optional) */
1108 if (likely(!(flags
& MSG_PEEK
))) {
1109 if (unlikely(++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
1110 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
1111 advance_rx_queue(sk
);
1114 /* Loop around if more data is required */
1115 if ((sz_copied
< buf_len
) && /* didn't get all requested data */
1116 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1117 (sz_copied
< target
)) && /* and more is ready or required */
1118 (!(flags
& MSG_PEEK
)) && /* and aren't just peeking at data */
1119 (!err
)) /* and haven't reached a FIN */
1124 return sz_copied
? sz_copied
: res
;
1128 * rx_queue_full - determine if receive queue can accept another message
1129 * @msg: message to be added to queue
1130 * @queue_size: current size of queue
1131 * @base: nominal maximum size of queue
1133 * Returns 1 if queue is unable to accept message, 0 otherwise
1135 static int rx_queue_full(struct tipc_msg
*msg
, u32 queue_size
, u32 base
)
1138 u32 imp
= msg_importance(msg
);
1140 if (imp
== TIPC_LOW_IMPORTANCE
)
1142 else if (imp
== TIPC_MEDIUM_IMPORTANCE
)
1143 threshold
= base
* 2;
1144 else if (imp
== TIPC_HIGH_IMPORTANCE
)
1145 threshold
= base
* 100;
1149 if (msg_connected(msg
))
1152 return queue_size
>= threshold
;
1156 * filter_rcv - validate incoming message
1160 * Enqueues message on receive queue if acceptable; optionally handles
1161 * disconnect indication for a connected socket.
1163 * Called with socket lock already taken; port lock may also be taken.
1165 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1167 static u32
filter_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1169 struct socket
*sock
= sk
->sk_socket
;
1170 struct tipc_msg
*msg
= buf_msg(buf
);
1173 /* Reject message if it is wrong sort of message for socket */
1174 if (msg_type(msg
) > TIPC_DIRECT_MSG
)
1175 return TIPC_ERR_NO_PORT
;
1177 if (sock
->state
== SS_READY
) {
1178 if (msg_connected(msg
))
1179 return TIPC_ERR_NO_PORT
;
1182 return TIPC_ERR_NO_PORT
;
1183 if (sock
->state
== SS_CONNECTED
) {
1184 if (!msg_connected(msg
) ||
1185 !tipc_port_peer_msg(tipc_sk_port(sk
), msg
))
1186 return TIPC_ERR_NO_PORT
;
1187 } else if (sock
->state
== SS_CONNECTING
) {
1188 if (!msg_connected(msg
) && (msg_errcode(msg
) == 0))
1189 return TIPC_ERR_NO_PORT
;
1190 } else if (sock
->state
== SS_LISTENING
) {
1191 if (msg_connected(msg
) || msg_errcode(msg
))
1192 return TIPC_ERR_NO_PORT
;
1193 } else if (sock
->state
== SS_DISCONNECTING
) {
1194 return TIPC_ERR_NO_PORT
;
1195 } else /* (sock->state == SS_UNCONNECTED) */ {
1196 if (msg_connected(msg
) || msg_errcode(msg
))
1197 return TIPC_ERR_NO_PORT
;
1201 /* Reject message if there isn't room to queue it */
1202 recv_q_len
= (u32
)atomic_read(&tipc_queue_size
);
1203 if (unlikely(recv_q_len
>= OVERLOAD_LIMIT_BASE
)) {
1204 if (rx_queue_full(msg
, recv_q_len
, OVERLOAD_LIMIT_BASE
))
1205 return TIPC_ERR_OVERLOAD
;
1207 recv_q_len
= skb_queue_len(&sk
->sk_receive_queue
);
1208 if (unlikely(recv_q_len
>= (OVERLOAD_LIMIT_BASE
/ 2))) {
1209 if (rx_queue_full(msg
, recv_q_len
, OVERLOAD_LIMIT_BASE
/ 2))
1210 return TIPC_ERR_OVERLOAD
;
1213 /* Enqueue message (finally!) */
1214 TIPC_SKB_CB(buf
)->handle
= 0;
1215 atomic_inc(&tipc_queue_size
);
1216 __skb_queue_tail(&sk
->sk_receive_queue
, buf
);
1218 /* Initiate connection termination for an incoming 'FIN' */
1219 if (unlikely(msg_errcode(msg
) && (sock
->state
== SS_CONNECTED
))) {
1220 sock
->state
= SS_DISCONNECTING
;
1221 tipc_disconnect_port(tipc_sk_port(sk
));
1224 if (waitqueue_active(sk_sleep(sk
)))
1225 wake_up_interruptible(sk_sleep(sk
));
1230 * backlog_rcv - handle incoming message from backlog queue
1234 * Caller must hold socket lock, but not port lock.
1238 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1242 res
= filter_rcv(sk
, buf
);
1244 tipc_reject_msg(buf
, res
);
1249 * dispatch - handle incoming message
1250 * @tport: TIPC port that received message
1253 * Called with port lock already taken.
1255 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1257 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
)
1259 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1263 * Process message if socket is unlocked; otherwise add to backlog queue
1265 * This code is based on sk_receive_skb(), but must be distinct from it
1266 * since a TIPC-specific filter/reject mechanism is utilized
1269 if (!sock_owned_by_user(sk
)) {
1270 res
= filter_rcv(sk
, buf
);
1272 if (sk_add_backlog(sk
, buf
, sk
->sk_rcvbuf
))
1273 res
= TIPC_ERR_OVERLOAD
;
1283 * wakeupdispatch - wake up port after congestion
1284 * @tport: port to wakeup
1286 * Called with port lock already taken.
1288 static void wakeupdispatch(struct tipc_port
*tport
)
1290 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1292 if (waitqueue_active(sk_sleep(sk
)))
1293 wake_up_interruptible(sk_sleep(sk
));
1297 * connect - establish a connection to another TIPC port
1298 * @sock: socket structure
1299 * @dest: socket address for destination port
1300 * @destlen: size of socket address data structure
1301 * @flags: file-related flags associated with socket
1303 * Returns 0 on success, errno otherwise
1305 static int connect(struct socket
*sock
, struct sockaddr
*dest
, int destlen
,
1308 struct sock
*sk
= sock
->sk
;
1309 struct sockaddr_tipc
*dst
= (struct sockaddr_tipc
*)dest
;
1310 struct msghdr m
= {NULL
,};
1311 struct sk_buff
*buf
;
1312 struct tipc_msg
*msg
;
1313 unsigned int timeout
;
1318 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1319 if (sock
->state
== SS_READY
) {
1324 /* For now, TIPC does not support the non-blocking form of connect() */
1325 if (flags
& O_NONBLOCK
) {
1330 /* Issue Posix-compliant error code if socket is in the wrong state */
1331 if (sock
->state
== SS_LISTENING
) {
1335 if (sock
->state
== SS_CONNECTING
) {
1339 if (sock
->state
!= SS_UNCONNECTED
) {
1345 * Reject connection attempt using multicast address
1347 * Note: send_msg() validates the rest of the address fields,
1348 * so there's no need to do it here
1350 if (dst
->addrtype
== TIPC_ADDR_MCAST
) {
1355 /* Reject any messages already in receive queue (very unlikely) */
1356 reject_rx_queue(sk
);
1358 /* Send a 'SYN-' to destination */
1360 m
.msg_namelen
= destlen
;
1361 res
= send_msg(NULL
, sock
, &m
, 0);
1365 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1366 timeout
= tipc_sk(sk
)->conn_timeout
;
1368 res
= wait_event_interruptible_timeout(*sk_sleep(sk
),
1369 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1370 (sock
->state
!= SS_CONNECTING
)),
1371 timeout
? (long)msecs_to_jiffies(timeout
)
1372 : MAX_SCHEDULE_TIMEOUT
);
1376 buf
= skb_peek(&sk
->sk_receive_queue
);
1379 res
= auto_connect(sock
, msg
);
1381 if (!msg_data_sz(msg
))
1382 advance_rx_queue(sk
);
1385 if (sock
->state
== SS_CONNECTED
)
1388 res
= -ECONNREFUSED
;
1394 ; /* leave "res" unchanged */
1395 sock
->state
= SS_DISCONNECTING
;
1404 * listen - allow socket to listen for incoming connections
1405 * @sock: socket structure
1408 * Returns 0 on success, errno otherwise
1410 static int listen(struct socket
*sock
, int len
)
1412 struct sock
*sk
= sock
->sk
;
1417 if (sock
->state
!= SS_UNCONNECTED
)
1420 sock
->state
= SS_LISTENING
;
1429 * accept - wait for connection request
1430 * @sock: listening socket
1431 * @newsock: new socket that is to be connected
1432 * @flags: file-related flags associated with socket
1434 * Returns 0 on success, errno otherwise
1436 static int accept(struct socket
*sock
, struct socket
*new_sock
, int flags
)
1438 struct sock
*sk
= sock
->sk
;
1439 struct sk_buff
*buf
;
1444 if (sock
->state
!= SS_LISTENING
) {
1449 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1450 if (flags
& O_NONBLOCK
) {
1455 res
= wait_event_interruptible(*sk_sleep(sk
),
1456 (!skb_queue_empty(&sk
->sk_receive_queue
)));
1462 buf
= skb_peek(&sk
->sk_receive_queue
);
1464 res
= tipc_create(sock_net(sock
->sk
), new_sock
, 0, 0);
1466 struct sock
*new_sk
= new_sock
->sk
;
1467 struct tipc_sock
*new_tsock
= tipc_sk(new_sk
);
1468 struct tipc_port
*new_tport
= new_tsock
->p
;
1469 u32 new_ref
= new_tport
->ref
;
1470 struct tipc_msg
*msg
= buf_msg(buf
);
1475 * Reject any stray messages received by new socket
1476 * before the socket lock was taken (very, very unlikely)
1478 reject_rx_queue(new_sk
);
1480 /* Connect new socket to it's peer */
1481 new_tsock
->peer_name
.ref
= msg_origport(msg
);
1482 new_tsock
->peer_name
.node
= msg_orignode(msg
);
1483 tipc_connect2port(new_ref
, &new_tsock
->peer_name
);
1484 new_sock
->state
= SS_CONNECTED
;
1486 tipc_set_portimportance(new_ref
, msg_importance(msg
));
1487 if (msg_named(msg
)) {
1488 new_tport
->conn_type
= msg_nametype(msg
);
1489 new_tport
->conn_instance
= msg_nameinst(msg
);
1493 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1494 * Respond to 'SYN+' by queuing it on new socket.
1496 if (!msg_data_sz(msg
)) {
1497 struct msghdr m
= {NULL
,};
1499 advance_rx_queue(sk
);
1500 send_packet(NULL
, new_sock
, &m
, 0);
1502 __skb_dequeue(&sk
->sk_receive_queue
);
1503 __skb_queue_head(&new_sk
->sk_receive_queue
, buf
);
1505 release_sock(new_sk
);
1513 * shutdown - shutdown socket connection
1514 * @sock: socket structure
1515 * @how: direction to close (must be SHUT_RDWR)
1517 * Terminates connection (if necessary), then purges socket's receive queue.
1519 * Returns 0 on success, errno otherwise
1521 static int shutdown(struct socket
*sock
, int how
)
1523 struct sock
*sk
= sock
->sk
;
1524 struct tipc_port
*tport
= tipc_sk_port(sk
);
1525 struct sk_buff
*buf
;
1528 if (how
!= SHUT_RDWR
)
1533 switch (sock
->state
) {
1538 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1539 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
1541 atomic_dec(&tipc_queue_size
);
1542 if (TIPC_SKB_CB(buf
)->handle
!= 0) {
1546 tipc_disconnect(tport
->ref
);
1547 tipc_reject_msg(buf
, TIPC_CONN_SHUTDOWN
);
1549 tipc_shutdown(tport
->ref
);
1552 sock
->state
= SS_DISCONNECTING
;
1556 case SS_DISCONNECTING
:
1558 /* Discard any unreceived messages; wake up sleeping tasks */
1559 discard_rx_queue(sk
);
1560 if (waitqueue_active(sk_sleep(sk
)))
1561 wake_up_interruptible(sk_sleep(sk
));
1574 * setsockopt - set socket option
1575 * @sock: socket structure
1576 * @lvl: option level
1577 * @opt: option identifier
1578 * @ov: pointer to new option value
1579 * @ol: length of option value
1581 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1582 * (to ease compatibility).
1584 * Returns 0 on success, errno otherwise
1586 static int setsockopt(struct socket
*sock
,
1587 int lvl
, int opt
, char __user
*ov
, unsigned int ol
)
1589 struct sock
*sk
= sock
->sk
;
1590 struct tipc_port
*tport
= tipc_sk_port(sk
);
1594 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1596 if (lvl
!= SOL_TIPC
)
1597 return -ENOPROTOOPT
;
1598 if (ol
< sizeof(value
))
1600 res
= get_user(value
, (u32 __user
*)ov
);
1607 case TIPC_IMPORTANCE
:
1608 res
= tipc_set_portimportance(tport
->ref
, value
);
1610 case TIPC_SRC_DROPPABLE
:
1611 if (sock
->type
!= SOCK_STREAM
)
1612 res
= tipc_set_portunreliable(tport
->ref
, value
);
1616 case TIPC_DEST_DROPPABLE
:
1617 res
= tipc_set_portunreturnable(tport
->ref
, value
);
1619 case TIPC_CONN_TIMEOUT
:
1620 tipc_sk(sk
)->conn_timeout
= value
;
1621 /* no need to set "res", since already 0 at this point */
1633 * getsockopt - get socket option
1634 * @sock: socket structure
1635 * @lvl: option level
1636 * @opt: option identifier
1637 * @ov: receptacle for option value
1638 * @ol: receptacle for length of option value
1640 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1641 * (to ease compatibility).
1643 * Returns 0 on success, errno otherwise
1645 static int getsockopt(struct socket
*sock
,
1646 int lvl
, int opt
, char __user
*ov
, int __user
*ol
)
1648 struct sock
*sk
= sock
->sk
;
1649 struct tipc_port
*tport
= tipc_sk_port(sk
);
1654 if ((lvl
== IPPROTO_TCP
) && (sock
->type
== SOCK_STREAM
))
1655 return put_user(0, ol
);
1656 if (lvl
!= SOL_TIPC
)
1657 return -ENOPROTOOPT
;
1658 res
= get_user(len
, ol
);
1665 case TIPC_IMPORTANCE
:
1666 res
= tipc_portimportance(tport
->ref
, &value
);
1668 case TIPC_SRC_DROPPABLE
:
1669 res
= tipc_portunreliable(tport
->ref
, &value
);
1671 case TIPC_DEST_DROPPABLE
:
1672 res
= tipc_portunreturnable(tport
->ref
, &value
);
1674 case TIPC_CONN_TIMEOUT
:
1675 value
= tipc_sk(sk
)->conn_timeout
;
1676 /* no need to set "res", since already 0 at this point */
1678 case TIPC_NODE_RECVQ_DEPTH
:
1679 value
= (u32
)atomic_read(&tipc_queue_size
);
1681 case TIPC_SOCK_RECVQ_DEPTH
:
1682 value
= skb_queue_len(&sk
->sk_receive_queue
);
1691 return res
; /* "get" failed */
1693 if (len
< sizeof(value
))
1696 if (copy_to_user(ov
, &value
, sizeof(value
)))
1699 return put_user(sizeof(value
), ol
);
1702 /* Protocol switches for the various types of TIPC sockets */
1704 static const struct proto_ops msg_ops
= {
1705 .owner
= THIS_MODULE
,
1710 .socketpair
= sock_no_socketpair
,
1711 .accept
= sock_no_accept
,
1712 .getname
= get_name
,
1714 .ioctl
= sock_no_ioctl
,
1715 .listen
= sock_no_listen
,
1716 .shutdown
= shutdown
,
1717 .setsockopt
= setsockopt
,
1718 .getsockopt
= getsockopt
,
1719 .sendmsg
= send_msg
,
1720 .recvmsg
= recv_msg
,
1721 .mmap
= sock_no_mmap
,
1722 .sendpage
= sock_no_sendpage
1725 static const struct proto_ops packet_ops
= {
1726 .owner
= THIS_MODULE
,
1731 .socketpair
= sock_no_socketpair
,
1733 .getname
= get_name
,
1735 .ioctl
= sock_no_ioctl
,
1737 .shutdown
= shutdown
,
1738 .setsockopt
= setsockopt
,
1739 .getsockopt
= getsockopt
,
1740 .sendmsg
= send_packet
,
1741 .recvmsg
= recv_msg
,
1742 .mmap
= sock_no_mmap
,
1743 .sendpage
= sock_no_sendpage
1746 static const struct proto_ops stream_ops
= {
1747 .owner
= THIS_MODULE
,
1752 .socketpair
= sock_no_socketpair
,
1754 .getname
= get_name
,
1756 .ioctl
= sock_no_ioctl
,
1758 .shutdown
= shutdown
,
1759 .setsockopt
= setsockopt
,
1760 .getsockopt
= getsockopt
,
1761 .sendmsg
= send_stream
,
1762 .recvmsg
= recv_stream
,
1763 .mmap
= sock_no_mmap
,
1764 .sendpage
= sock_no_sendpage
1767 static const struct net_proto_family tipc_family_ops
= {
1768 .owner
= THIS_MODULE
,
1770 .create
= tipc_create
1773 static struct proto tipc_proto
= {
1775 .owner
= THIS_MODULE
,
1776 .obj_size
= sizeof(struct tipc_sock
)
1780 * tipc_socket_init - initialize TIPC socket interface
1782 * Returns 0 on success, errno otherwise
1784 int tipc_socket_init(void)
1788 res
= proto_register(&tipc_proto
, 1);
1790 pr_err("Failed to register TIPC protocol type\n");
1794 res
= sock_register(&tipc_family_ops
);
1796 pr_err("Failed to register TIPC socket type\n");
1797 proto_unregister(&tipc_proto
);
1801 sockets_enabled
= 1;
1807 * tipc_socket_stop - stop TIPC socket interface
1809 void tipc_socket_stop(void)
1811 if (!sockets_enabled
)
1814 sockets_enabled
= 0;
1815 sock_unregister(tipc_family_ops
.family
);
1816 proto_unregister(&tipc_proto
);