2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012 Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2012, 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 CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
51 struct tipc_portid peer_name
;
52 unsigned int conn_timeout
;
55 #define tipc_sk(sk) ((struct tipc_sock *)(sk))
56 #define tipc_sk_port(sk) (tipc_sk(sk)->p)
58 #define tipc_rx_ready(sock) (!skb_queue_empty(&sock->sk->sk_receive_queue) || \
59 (sock->state == SS_DISCONNECTING))
61 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*skb
);
62 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
);
63 static void wakeupdispatch(struct tipc_port
*tport
);
64 static void tipc_data_ready(struct sock
*sk
, int len
);
65 static void tipc_write_space(struct sock
*sk
);
67 static const struct proto_ops packet_ops
;
68 static const struct proto_ops stream_ops
;
69 static const struct proto_ops msg_ops
;
71 static struct proto tipc_proto
;
73 static int sockets_enabled
;
76 * Revised TIPC socket locking policy:
78 * Most socket operations take the standard socket lock when they start
79 * and hold it until they finish (or until they need to sleep). Acquiring
80 * this lock grants the owner exclusive access to the fields of the socket
81 * data structures, with the exception of the backlog queue. A few socket
82 * operations can be done without taking the socket lock because they only
83 * read socket information that never changes during the life of the socket.
85 * Socket operations may acquire the lock for the associated TIPC port if they
86 * need to perform an operation on the port. If any routine needs to acquire
87 * both the socket lock and the port lock it must take the socket lock first
88 * to avoid the risk of deadlock.
90 * The dispatcher handling incoming messages cannot grab the socket lock in
91 * the standard fashion, since invoked it runs at the BH level and cannot block.
92 * Instead, it checks to see if the socket lock is currently owned by someone,
93 * and either handles the message itself or adds it to the socket's backlog
94 * queue; in the latter case the queued message is processed once the process
95 * owning the socket lock releases it.
97 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
98 * the problem of a blocked socket operation preventing any other operations
99 * from occurring. However, applications must be careful if they have
100 * multiple threads trying to send (or receive) on the same socket, as these
101 * operations might interfere with each other. For example, doing a connect
102 * and a receive at the same time might allow the receive to consume the
103 * ACK message meant for the connect. While additional work could be done
104 * to try and overcome this, it doesn't seem to be worthwhile at the present.
106 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
107 * that another operation that must be performed in a non-blocking manner is
108 * not delayed for very long because the lock has already been taken.
110 * NOTE: This code assumes that certain fields of a port/socket pair are
111 * constant over its lifetime; such fields can be examined without taking
112 * the socket lock and/or port lock, and do not need to be re-read even
113 * after resuming processing after waiting. These fields include:
115 * - pointer to socket sk structure (aka tipc_sock structure)
116 * - pointer to port structure
121 * advance_rx_queue - discard first buffer in socket receive queue
123 * Caller must hold socket lock
125 static void advance_rx_queue(struct sock
*sk
)
127 kfree_skb(__skb_dequeue(&sk
->sk_receive_queue
));
131 * reject_rx_queue - reject all buffers in socket receive queue
133 * Caller must hold socket lock
135 static void reject_rx_queue(struct sock
*sk
)
139 while ((buf
= __skb_dequeue(&sk
->sk_receive_queue
)))
140 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
144 * tipc_create - create a TIPC socket
145 * @net: network namespace (must be default network)
146 * @sock: pre-allocated socket structure
147 * @protocol: protocol indicator (must be 0)
148 * @kern: caused by kernel or by userspace?
150 * This routine creates additional data structures used by the TIPC socket,
151 * initializes them, and links them together.
153 * Returns 0 on success, errno otherwise
155 static int tipc_create(struct net
*net
, struct socket
*sock
, int protocol
,
158 const struct proto_ops
*ops
;
161 struct tipc_port
*tp_ptr
;
163 /* Validate arguments */
164 if (unlikely(protocol
!= 0))
165 return -EPROTONOSUPPORT
;
167 switch (sock
->type
) {
170 state
= SS_UNCONNECTED
;
174 state
= SS_UNCONNECTED
;
185 /* Allocate socket's protocol area */
186 sk
= sk_alloc(net
, AF_TIPC
, GFP_KERNEL
, &tipc_proto
);
190 /* Allocate TIPC port for socket to use */
191 tp_ptr
= tipc_createport_raw(sk
, &dispatch
, &wakeupdispatch
,
192 TIPC_LOW_IMPORTANCE
);
193 if (unlikely(!tp_ptr
)) {
198 /* Finish initializing socket data structures */
202 sock_init_data(sock
, sk
);
203 sk
->sk_backlog_rcv
= backlog_rcv
;
204 sk
->sk_rcvbuf
= sysctl_tipc_rmem
[1];
205 sk
->sk_data_ready
= tipc_data_ready
;
206 sk
->sk_write_space
= tipc_write_space
;
207 tipc_sk(sk
)->p
= tp_ptr
;
208 tipc_sk(sk
)->conn_timeout
= CONN_TIMEOUT_DEFAULT
;
210 spin_unlock_bh(tp_ptr
->lock
);
212 if (sock
->state
== SS_READY
) {
213 tipc_set_portunreturnable(tp_ptr
->ref
, 1);
214 if (sock
->type
== SOCK_DGRAM
)
215 tipc_set_portunreliable(tp_ptr
->ref
, 1);
222 * release - destroy a TIPC socket
223 * @sock: socket to destroy
225 * This routine cleans up any messages that are still queued on the socket.
226 * For DGRAM and RDM socket types, all queued messages are rejected.
227 * For SEQPACKET and STREAM socket types, the first message is rejected
228 * and any others are discarded. (If the first message on a STREAM socket
229 * is partially-read, it is discarded and the next one is rejected instead.)
231 * NOTE: Rejected messages are not necessarily returned to the sender! They
232 * are returned or discarded according to the "destination droppable" setting
233 * specified for the message by the sender.
235 * Returns 0 on success, errno otherwise
237 static int release(struct socket
*sock
)
239 struct sock
*sk
= sock
->sk
;
240 struct tipc_port
*tport
;
245 * Exit if socket isn't fully initialized (occurs when a failed accept()
246 * releases a pre-allocated child socket that was never used)
251 tport
= tipc_sk_port(sk
);
255 * Reject all unreceived messages, except on an active connection
256 * (which disconnects locally & sends a 'FIN+' to peer)
258 while (sock
->state
!= SS_DISCONNECTING
) {
259 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
262 if (TIPC_SKB_CB(buf
)->handle
!= 0)
265 if ((sock
->state
== SS_CONNECTING
) ||
266 (sock
->state
== SS_CONNECTED
)) {
267 sock
->state
= SS_DISCONNECTING
;
268 tipc_disconnect(tport
->ref
);
270 tipc_reject_msg(buf
, TIPC_ERR_NO_PORT
);
275 * Delete TIPC port; this ensures no more messages are queued
276 * (also disconnects an active connection & sends a 'FIN-' to peer)
278 res
= tipc_deleteport(tport
->ref
);
280 /* Discard any remaining (connection-based) messages in receive queue */
281 __skb_queue_purge(&sk
->sk_receive_queue
);
283 /* Reject any messages that accumulated in backlog queue */
284 sock
->state
= SS_DISCONNECTING
;
294 * bind - associate or disassocate TIPC name(s) with a socket
295 * @sock: socket structure
296 * @uaddr: socket address describing name(s) and desired operation
297 * @uaddr_len: size of socket address data structure
299 * Name and name sequence binding is indicated using a positive scope value;
300 * a negative scope value unbinds the specified name. Specifying no name
301 * (i.e. a socket address length of 0) unbinds all names from the socket.
303 * Returns 0 on success, errno otherwise
305 * NOTE: This routine doesn't need to take the socket lock since it doesn't
306 * access any non-constant socket information.
308 static int bind(struct socket
*sock
, struct sockaddr
*uaddr
, int uaddr_len
)
310 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
311 u32 portref
= tipc_sk_port(sock
->sk
)->ref
;
313 if (unlikely(!uaddr_len
))
314 return tipc_withdraw(portref
, 0, NULL
);
316 if (uaddr_len
< sizeof(struct sockaddr_tipc
))
318 if (addr
->family
!= AF_TIPC
)
319 return -EAFNOSUPPORT
;
321 if (addr
->addrtype
== TIPC_ADDR_NAME
)
322 addr
->addr
.nameseq
.upper
= addr
->addr
.nameseq
.lower
;
323 else if (addr
->addrtype
!= TIPC_ADDR_NAMESEQ
)
324 return -EAFNOSUPPORT
;
326 if (addr
->addr
.nameseq
.type
< TIPC_RESERVED_TYPES
)
329 return (addr
->scope
> 0) ?
330 tipc_publish(portref
, addr
->scope
, &addr
->addr
.nameseq
) :
331 tipc_withdraw(portref
, -addr
->scope
, &addr
->addr
.nameseq
);
335 * get_name - get port ID of socket or peer socket
336 * @sock: socket structure
337 * @uaddr: area for returned socket address
338 * @uaddr_len: area for returned length of socket address
339 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
341 * Returns 0 on success, errno otherwise
343 * NOTE: This routine doesn't need to take the socket lock since it only
344 * accesses socket information that is unchanging (or which changes in
345 * a completely predictable manner).
347 static int get_name(struct socket
*sock
, struct sockaddr
*uaddr
,
348 int *uaddr_len
, int peer
)
350 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)uaddr
;
351 struct tipc_sock
*tsock
= tipc_sk(sock
->sk
);
353 memset(addr
, 0, sizeof(*addr
));
355 if ((sock
->state
!= SS_CONNECTED
) &&
356 ((peer
!= 2) || (sock
->state
!= SS_DISCONNECTING
)))
358 addr
->addr
.id
.ref
= tsock
->peer_name
.ref
;
359 addr
->addr
.id
.node
= tsock
->peer_name
.node
;
361 addr
->addr
.id
.ref
= tsock
->p
->ref
;
362 addr
->addr
.id
.node
= tipc_own_addr
;
365 *uaddr_len
= sizeof(*addr
);
366 addr
->addrtype
= TIPC_ADDR_ID
;
367 addr
->family
= AF_TIPC
;
369 addr
->addr
.name
.domain
= 0;
375 * poll - read and possibly block on pollmask
376 * @file: file structure associated with the socket
377 * @sock: socket for which to calculate the poll bits
380 * Returns pollmask value
383 * It appears that the usual socket locking mechanisms are not useful here
384 * since the pollmask info is potentially out-of-date the moment this routine
385 * exits. TCP and other protocols seem to rely on higher level poll routines
386 * to handle any preventable race conditions, so TIPC will do the same ...
388 * TIPC sets the returned events as follows:
390 * socket state flags set
391 * ------------ ---------
392 * unconnected no read flags
393 * POLLOUT if port is not congested
395 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
398 * connected POLLIN/POLLRDNORM if data in rx queue
399 * POLLOUT if port is not congested
401 * disconnecting POLLIN/POLLRDNORM/POLLHUP
404 * listening POLLIN if SYN in rx queue
407 * ready POLLIN/POLLRDNORM if data in rx queue
408 * [connectionless] POLLOUT (since port cannot be congested)
410 * IMPORTANT: The fact that a read or write operation is indicated does NOT
411 * imply that the operation will succeed, merely that it should be performed
412 * and will not block.
414 static unsigned int poll(struct file
*file
, struct socket
*sock
,
417 struct sock
*sk
= sock
->sk
;
420 sock_poll_wait(file
, sk_sleep(sk
), wait
);
422 switch ((int)sock
->state
) {
424 if (!tipc_sk_port(sk
)->congested
)
429 if (!tipc_sk_port(sk
)->congested
)
434 if (!skb_queue_empty(&sk
->sk_receive_queue
))
435 mask
|= (POLLIN
| POLLRDNORM
);
437 case SS_DISCONNECTING
:
438 mask
= (POLLIN
| POLLRDNORM
| POLLHUP
);
446 * dest_name_check - verify user is permitted to send to specified port name
447 * @dest: destination address
448 * @m: descriptor for message to be sent
450 * Prevents restricted configuration commands from being issued by
451 * unauthorized users.
453 * Returns 0 if permission is granted, otherwise errno
455 static int dest_name_check(struct sockaddr_tipc
*dest
, struct msghdr
*m
)
457 struct tipc_cfg_msg_hdr hdr
;
459 if (likely(dest
->addr
.name
.name
.type
>= TIPC_RESERVED_TYPES
))
461 if (likely(dest
->addr
.name
.name
.type
== TIPC_TOP_SRV
))
463 if (likely(dest
->addr
.name
.name
.type
!= TIPC_CFG_SRV
))
466 if (!m
->msg_iovlen
|| (m
->msg_iov
[0].iov_len
< sizeof(hdr
)))
468 if (copy_from_user(&hdr
, m
->msg_iov
[0].iov_base
, sizeof(hdr
)))
470 if ((ntohs(hdr
.tcm_type
) & 0xC000) && (!capable(CAP_NET_ADMIN
)))
477 * send_msg - send message in connectionless manner
478 * @iocb: if NULL, indicates that socket lock is already held
479 * @sock: socket structure
480 * @m: message to send
481 * @total_len: length of message
483 * Message must have an destination specified explicitly.
484 * Used for SOCK_RDM and SOCK_DGRAM messages,
485 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
486 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
488 * Returns the number of bytes sent on success, or errno otherwise
490 static int send_msg(struct kiocb
*iocb
, struct socket
*sock
,
491 struct msghdr
*m
, size_t total_len
)
493 struct sock
*sk
= sock
->sk
;
494 struct tipc_port
*tport
= tipc_sk_port(sk
);
495 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
501 return -EDESTADDRREQ
;
502 if (unlikely((m
->msg_namelen
< sizeof(*dest
)) ||
503 (dest
->family
!= AF_TIPC
)))
505 if (total_len
> TIPC_MAX_USER_MSG_SIZE
)
511 needs_conn
= (sock
->state
!= SS_READY
);
512 if (unlikely(needs_conn
)) {
513 if (sock
->state
== SS_LISTENING
) {
517 if (sock
->state
!= SS_UNCONNECTED
) {
521 if ((tport
->published
) ||
522 ((sock
->type
== SOCK_STREAM
) && (total_len
!= 0))) {
526 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
527 tport
->conn_type
= dest
->addr
.name
.name
.type
;
528 tport
->conn_instance
= dest
->addr
.name
.name
.instance
;
531 /* Abort any pending connection attempts (very unlikely) */
535 timeout_val
= sock_sndtimeo(sk
, m
->msg_flags
& MSG_DONTWAIT
);
538 if (dest
->addrtype
== TIPC_ADDR_NAME
) {
539 res
= dest_name_check(dest
, m
);
542 res
= tipc_send2name(tport
->ref
,
543 &dest
->addr
.name
.name
,
544 dest
->addr
.name
.domain
,
548 } else if (dest
->addrtype
== TIPC_ADDR_ID
) {
549 res
= tipc_send2port(tport
->ref
,
554 } else if (dest
->addrtype
== TIPC_ADDR_MCAST
) {
559 res
= dest_name_check(dest
, m
);
562 res
= tipc_multicast(tport
->ref
,
568 if (likely(res
!= -ELINKCONG
)) {
569 if (needs_conn
&& (res
>= 0))
570 sock
->state
= SS_CONNECTING
;
573 if (timeout_val
<= 0L) {
574 res
= timeout_val
? timeout_val
: -EWOULDBLOCK
;
578 timeout_val
= wait_event_interruptible_timeout(*sk_sleep(sk
),
579 !tport
->congested
, timeout_val
);
590 * send_packet - send a connection-oriented message
591 * @iocb: if NULL, indicates that socket lock is already held
592 * @sock: socket structure
593 * @m: message to send
594 * @total_len: length of message
596 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
598 * Returns the number of bytes sent on success, or errno otherwise
600 static int send_packet(struct kiocb
*iocb
, struct socket
*sock
,
601 struct msghdr
*m
, size_t total_len
)
603 struct sock
*sk
= sock
->sk
;
604 struct tipc_port
*tport
= tipc_sk_port(sk
);
605 struct sockaddr_tipc
*dest
= (struct sockaddr_tipc
*)m
->msg_name
;
609 /* Handle implied connection establishment */
611 return send_msg(iocb
, sock
, m
, total_len
);
613 if (total_len
> TIPC_MAX_USER_MSG_SIZE
)
619 timeout_val
= sock_sndtimeo(sk
, m
->msg_flags
& MSG_DONTWAIT
);
622 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
623 if (sock
->state
== SS_DISCONNECTING
)
630 res
= tipc_send(tport
->ref
, m
->msg_iovlen
, m
->msg_iov
,
632 if (likely(res
!= -ELINKCONG
))
634 if (timeout_val
<= 0L) {
635 res
= timeout_val
? timeout_val
: -EWOULDBLOCK
;
639 timeout_val
= wait_event_interruptible_timeout(*sk_sleep(sk
),
640 (!tport
->congested
|| !tport
->connected
), timeout_val
);
650 * send_stream - send stream-oriented data
652 * @sock: socket structure
654 * @total_len: total length of data to be sent
656 * Used for SOCK_STREAM data.
658 * Returns the number of bytes sent on success (or partial success),
659 * or errno if no data sent
661 static int send_stream(struct kiocb
*iocb
, struct socket
*sock
,
662 struct msghdr
*m
, size_t total_len
)
664 struct sock
*sk
= sock
->sk
;
665 struct tipc_port
*tport
= tipc_sk_port(sk
);
666 struct msghdr my_msg
;
668 struct iovec
*curr_iov
;
670 char __user
*curr_start
;
679 /* Handle special cases where there is no connection */
680 if (unlikely(sock
->state
!= SS_CONNECTED
)) {
681 if (sock
->state
== SS_UNCONNECTED
) {
682 res
= send_packet(NULL
, sock
, m
, total_len
);
684 } else if (sock
->state
== SS_DISCONNECTING
) {
693 if (unlikely(m
->msg_name
)) {
698 if (total_len
> (unsigned int)INT_MAX
) {
704 * Send each iovec entry using one or more messages
706 * Note: This algorithm is good for the most likely case
707 * (i.e. one large iovec entry), but could be improved to pass sets
708 * of small iovec entries into send_packet().
710 curr_iov
= m
->msg_iov
;
711 curr_iovlen
= m
->msg_iovlen
;
712 my_msg
.msg_iov
= &my_iov
;
713 my_msg
.msg_iovlen
= 1;
714 my_msg
.msg_flags
= m
->msg_flags
;
715 my_msg
.msg_name
= NULL
;
718 hdr_size
= msg_hdr_sz(&tport
->phdr
);
720 while (curr_iovlen
--) {
721 curr_start
= curr_iov
->iov_base
;
722 curr_left
= curr_iov
->iov_len
;
725 bytes_to_send
= tport
->max_pkt
- hdr_size
;
726 if (bytes_to_send
> TIPC_MAX_USER_MSG_SIZE
)
727 bytes_to_send
= TIPC_MAX_USER_MSG_SIZE
;
728 if (curr_left
< bytes_to_send
)
729 bytes_to_send
= curr_left
;
730 my_iov
.iov_base
= curr_start
;
731 my_iov
.iov_len
= bytes_to_send
;
732 res
= send_packet(NULL
, sock
, &my_msg
, bytes_to_send
);
738 curr_left
-= bytes_to_send
;
739 curr_start
+= bytes_to_send
;
740 bytes_sent
+= bytes_to_send
;
752 * auto_connect - complete connection setup to a remote port
753 * @sock: socket structure
754 * @msg: peer's response message
756 * Returns 0 on success, errno otherwise
758 static int auto_connect(struct socket
*sock
, struct tipc_msg
*msg
)
760 struct tipc_sock
*tsock
= tipc_sk(sock
->sk
);
761 struct tipc_port
*p_ptr
;
763 tsock
->peer_name
.ref
= msg_origport(msg
);
764 tsock
->peer_name
.node
= msg_orignode(msg
);
765 p_ptr
= tipc_port_deref(tsock
->p
->ref
);
769 __tipc_connect(tsock
->p
->ref
, p_ptr
, &tsock
->peer_name
);
771 if (msg_importance(msg
) > TIPC_CRITICAL_IMPORTANCE
)
773 msg_set_importance(&p_ptr
->phdr
, (u32
)msg_importance(msg
));
774 sock
->state
= SS_CONNECTED
;
779 * set_orig_addr - capture sender's address for received message
780 * @m: descriptor for message info
781 * @msg: received message header
783 * Note: Address is not captured if not requested by receiver.
785 static void set_orig_addr(struct msghdr
*m
, struct tipc_msg
*msg
)
787 struct sockaddr_tipc
*addr
= (struct sockaddr_tipc
*)m
->msg_name
;
790 addr
->family
= AF_TIPC
;
791 addr
->addrtype
= TIPC_ADDR_ID
;
792 memset(&addr
->addr
, 0, sizeof(addr
->addr
));
793 addr
->addr
.id
.ref
= msg_origport(msg
);
794 addr
->addr
.id
.node
= msg_orignode(msg
);
795 addr
->addr
.name
.domain
= 0; /* could leave uninitialized */
796 addr
->scope
= 0; /* could leave uninitialized */
797 m
->msg_namelen
= sizeof(struct sockaddr_tipc
);
802 * anc_data_recv - optionally capture ancillary data for received message
803 * @m: descriptor for message info
804 * @msg: received message header
805 * @tport: TIPC port associated with message
807 * Note: Ancillary data is not captured if not requested by receiver.
809 * Returns 0 if successful, otherwise errno
811 static int anc_data_recv(struct msghdr
*m
, struct tipc_msg
*msg
,
812 struct tipc_port
*tport
)
820 if (likely(m
->msg_controllen
== 0))
823 /* Optionally capture errored message object(s) */
824 err
= msg
? msg_errcode(msg
) : 0;
827 anc_data
[1] = msg_data_sz(msg
);
828 res
= put_cmsg(m
, SOL_TIPC
, TIPC_ERRINFO
, 8, anc_data
);
832 res
= put_cmsg(m
, SOL_TIPC
, TIPC_RETDATA
, anc_data
[1],
839 /* Optionally capture message destination object */
840 dest_type
= msg
? msg_type(msg
) : TIPC_DIRECT_MSG
;
844 anc_data
[0] = msg_nametype(msg
);
845 anc_data
[1] = msg_namelower(msg
);
846 anc_data
[2] = msg_namelower(msg
);
850 anc_data
[0] = msg_nametype(msg
);
851 anc_data
[1] = msg_namelower(msg
);
852 anc_data
[2] = msg_nameupper(msg
);
855 has_name
= (tport
->conn_type
!= 0);
856 anc_data
[0] = tport
->conn_type
;
857 anc_data
[1] = tport
->conn_instance
;
858 anc_data
[2] = tport
->conn_instance
;
864 res
= put_cmsg(m
, SOL_TIPC
, TIPC_DESTNAME
, 12, anc_data
);
873 * recv_msg - receive packet-oriented message
875 * @m: descriptor for message info
876 * @buf_len: total size of user buffer area
877 * @flags: receive flags
879 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
880 * If the complete message doesn't fit in user area, truncate it.
882 * Returns size of returned message data, errno otherwise
884 static int recv_msg(struct kiocb
*iocb
, struct socket
*sock
,
885 struct msghdr
*m
, size_t buf_len
, int flags
)
887 struct sock
*sk
= sock
->sk
;
888 struct tipc_port
*tport
= tipc_sk_port(sk
);
890 struct tipc_msg
*msg
;
896 /* Catch invalid receive requests */
897 if (unlikely(!buf_len
))
902 if (unlikely(sock
->state
== SS_UNCONNECTED
)) {
907 /* will be updated in set_orig_addr() if needed */
910 timeout
= sock_rcvtimeo(sk
, flags
& MSG_DONTWAIT
);
913 /* Look for a message in receive queue; wait if necessary */
914 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
915 if (sock
->state
== SS_DISCONNECTING
) {
920 res
= timeout
? timeout
: -EWOULDBLOCK
;
924 timeout
= wait_event_interruptible_timeout(*sk_sleep(sk
),
930 /* Look at first message in receive queue */
931 buf
= skb_peek(&sk
->sk_receive_queue
);
933 sz
= msg_data_sz(msg
);
934 err
= msg_errcode(msg
);
936 /* Discard an empty non-errored message & try again */
937 if ((!sz
) && (!err
)) {
938 advance_rx_queue(sk
);
942 /* Capture sender's address (optional) */
943 set_orig_addr(m
, msg
);
945 /* Capture ancillary data (optional) */
946 res
= anc_data_recv(m
, msg
, tport
);
950 /* Capture message data (if valid) & compute return value (always) */
952 if (unlikely(buf_len
< sz
)) {
954 m
->msg_flags
|= MSG_TRUNC
;
956 res
= skb_copy_datagram_iovec(buf
, msg_hdr_sz(msg
),
962 if ((sock
->state
== SS_READY
) ||
963 ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
))
969 /* Consume received message (optional) */
970 if (likely(!(flags
& MSG_PEEK
))) {
971 if ((sock
->state
!= SS_READY
) &&
972 (++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
973 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
974 advance_rx_queue(sk
);
982 * recv_stream - receive stream-oriented data
984 * @m: descriptor for message info
985 * @buf_len: total size of user buffer area
986 * @flags: receive flags
988 * Used for SOCK_STREAM messages only. If not enough data is available
989 * will optionally wait for more; never truncates data.
991 * Returns size of returned message data, errno otherwise
993 static int recv_stream(struct kiocb
*iocb
, struct socket
*sock
,
994 struct msghdr
*m
, size_t buf_len
, int flags
)
996 struct sock
*sk
= sock
->sk
;
997 struct tipc_port
*tport
= tipc_sk_port(sk
);
999 struct tipc_msg
*msg
;
1002 int sz_to_copy
, target
, needed
;
1007 /* Catch invalid receive attempts */
1008 if (unlikely(!buf_len
))
1013 if (unlikely((sock
->state
== SS_UNCONNECTED
) ||
1014 (sock
->state
== SS_CONNECTING
))) {
1019 /* will be updated in set_orig_addr() if needed */
1022 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, buf_len
);
1023 timeout
= sock_rcvtimeo(sk
, flags
& MSG_DONTWAIT
);
1026 /* Look for a message in receive queue; wait if necessary */
1027 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1028 if (sock
->state
== SS_DISCONNECTING
) {
1032 if (timeout
<= 0L) {
1033 res
= timeout
? timeout
: -EWOULDBLOCK
;
1037 timeout
= wait_event_interruptible_timeout(*sk_sleep(sk
),
1038 tipc_rx_ready(sock
),
1043 /* Look at first message in receive queue */
1044 buf
= skb_peek(&sk
->sk_receive_queue
);
1046 sz
= msg_data_sz(msg
);
1047 err
= msg_errcode(msg
);
1049 /* Discard an empty non-errored message & try again */
1050 if ((!sz
) && (!err
)) {
1051 advance_rx_queue(sk
);
1055 /* Optionally capture sender's address & ancillary data of first msg */
1056 if (sz_copied
== 0) {
1057 set_orig_addr(m
, msg
);
1058 res
= anc_data_recv(m
, msg
, tport
);
1063 /* Capture message data (if valid) & compute return value (always) */
1065 u32 offset
= (u32
)(unsigned long)(TIPC_SKB_CB(buf
)->handle
);
1068 needed
= (buf_len
- sz_copied
);
1069 sz_to_copy
= (sz
<= needed
) ? sz
: needed
;
1071 res
= skb_copy_datagram_iovec(buf
, msg_hdr_sz(msg
) + offset
,
1072 m
->msg_iov
, sz_to_copy
);
1076 sz_copied
+= sz_to_copy
;
1078 if (sz_to_copy
< sz
) {
1079 if (!(flags
& MSG_PEEK
))
1080 TIPC_SKB_CB(buf
)->handle
=
1081 (void *)(unsigned long)(offset
+ sz_to_copy
);
1086 goto exit
; /* can't add error msg to valid data */
1088 if ((err
== TIPC_CONN_SHUTDOWN
) || m
->msg_control
)
1094 /* Consume received message (optional) */
1095 if (likely(!(flags
& MSG_PEEK
))) {
1096 if (unlikely(++tport
->conn_unacked
>= TIPC_FLOW_CONTROL_WIN
))
1097 tipc_acknowledge(tport
->ref
, tport
->conn_unacked
);
1098 advance_rx_queue(sk
);
1101 /* Loop around if more data is required */
1102 if ((sz_copied
< buf_len
) && /* didn't get all requested data */
1103 (!skb_queue_empty(&sk
->sk_receive_queue
) ||
1104 (sz_copied
< target
)) && /* and more is ready or required */
1105 (!(flags
& MSG_PEEK
)) && /* and aren't just peeking at data */
1106 (!err
)) /* and haven't reached a FIN */
1111 return sz_copied
? sz_copied
: res
;
1115 * tipc_write_space - wake up thread if port congestion is released
1118 static void tipc_write_space(struct sock
*sk
)
1120 struct socket_wq
*wq
;
1123 wq
= rcu_dereference(sk
->sk_wq
);
1124 if (wq_has_sleeper(wq
))
1125 wake_up_interruptible_sync_poll(&wq
->wait
, POLLOUT
|
1126 POLLWRNORM
| POLLWRBAND
);
1131 * tipc_data_ready - wake up threads to indicate messages have been received
1133 * @len: the length of messages
1135 static void tipc_data_ready(struct sock
*sk
, int len
)
1137 struct socket_wq
*wq
;
1140 wq
= rcu_dereference(sk
->sk_wq
);
1141 if (wq_has_sleeper(wq
))
1142 wake_up_interruptible_sync_poll(&wq
->wait
, POLLIN
|
1143 POLLRDNORM
| POLLRDBAND
);
1148 * filter_connect - Handle all incoming messages for a connection-based socket
1149 * @tsock: TIPC socket
1152 * Returns TIPC error status code and socket error status code
1153 * once it encounters some errors
1155 static u32
filter_connect(struct tipc_sock
*tsock
, struct sk_buff
**buf
)
1157 struct socket
*sock
= tsock
->sk
.sk_socket
;
1158 struct tipc_msg
*msg
= buf_msg(*buf
);
1159 struct sock
*sk
= &tsock
->sk
;
1160 u32 retval
= TIPC_ERR_NO_PORT
;
1166 switch ((int)sock
->state
) {
1168 /* Accept only connection-based messages sent by peer */
1169 if (msg_connected(msg
) && tipc_port_peer_msg(tsock
->p
, msg
)) {
1170 if (unlikely(msg_errcode(msg
))) {
1171 sock
->state
= SS_DISCONNECTING
;
1172 __tipc_disconnect(tsock
->p
);
1178 /* Accept only ACK or NACK message */
1179 if (unlikely(msg_errcode(msg
))) {
1180 sock
->state
= SS_DISCONNECTING
;
1181 sk
->sk_err
= -ECONNREFUSED
;
1186 if (unlikely(!msg_connected(msg
)))
1189 res
= auto_connect(sock
, msg
);
1191 sock
->state
= SS_DISCONNECTING
;
1197 /* If an incoming message is an 'ACK-', it should be
1198 * discarded here because it doesn't contain useful
1199 * data. In addition, we should try to wake up
1200 * connect() routine if sleeping.
1202 if (msg_data_sz(msg
) == 0) {
1205 if (waitqueue_active(sk_sleep(sk
)))
1206 wake_up_interruptible(sk_sleep(sk
));
1211 case SS_UNCONNECTED
:
1212 /* Accept only SYN message */
1213 if (!msg_connected(msg
) && !(msg_errcode(msg
)))
1216 case SS_DISCONNECTING
:
1219 pr_err("Unknown socket state %u\n", sock
->state
);
1225 * rcvbuf_limit - get proper overload limit of socket receive queue
1229 * For all connection oriented messages, irrespective of importance,
1230 * the default overload value (i.e. 67MB) is set as limit.
1232 * For all connectionless messages, by default new queue limits are
1235 * TIPC_LOW_IMPORTANCE (4 MB)
1236 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1237 * TIPC_HIGH_IMPORTANCE (16 MB)
1238 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1240 * Returns overload limit according to corresponding message importance
1242 static unsigned int rcvbuf_limit(struct sock
*sk
, struct sk_buff
*buf
)
1244 struct tipc_msg
*msg
= buf_msg(buf
);
1247 if (msg_connected(msg
))
1248 limit
= sysctl_tipc_rmem
[2];
1250 limit
= sk
->sk_rcvbuf
>> TIPC_CRITICAL_IMPORTANCE
<<
1251 msg_importance(msg
);
1256 * filter_rcv - validate incoming message
1260 * Enqueues message on receive queue if acceptable; optionally handles
1261 * disconnect indication for a connected socket.
1263 * Called with socket lock already taken; port lock may also be taken.
1265 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1267 static u32
filter_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1269 struct socket
*sock
= sk
->sk_socket
;
1270 struct tipc_msg
*msg
= buf_msg(buf
);
1271 unsigned int limit
= rcvbuf_limit(sk
, buf
);
1274 /* Reject message if it is wrong sort of message for socket */
1275 if (msg_type(msg
) > TIPC_DIRECT_MSG
)
1276 return TIPC_ERR_NO_PORT
;
1278 if (sock
->state
== SS_READY
) {
1279 if (msg_connected(msg
))
1280 return TIPC_ERR_NO_PORT
;
1282 res
= filter_connect(tipc_sk(sk
), &buf
);
1283 if (res
!= TIPC_OK
|| buf
== NULL
)
1287 /* Reject message if there isn't room to queue it */
1288 if (sk_rmem_alloc_get(sk
) + buf
->truesize
>= limit
)
1289 return TIPC_ERR_OVERLOAD
;
1291 /* Enqueue message */
1292 TIPC_SKB_CB(buf
)->handle
= 0;
1293 __skb_queue_tail(&sk
->sk_receive_queue
, buf
);
1294 skb_set_owner_r(buf
, sk
);
1296 sk
->sk_data_ready(sk
, 0);
1301 * backlog_rcv - handle incoming message from backlog queue
1305 * Caller must hold socket lock, but not port lock.
1309 static int backlog_rcv(struct sock
*sk
, struct sk_buff
*buf
)
1313 res
= filter_rcv(sk
, buf
);
1315 tipc_reject_msg(buf
, res
);
1320 * dispatch - handle incoming message
1321 * @tport: TIPC port that received message
1324 * Called with port lock already taken.
1326 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1328 static u32
dispatch(struct tipc_port
*tport
, struct sk_buff
*buf
)
1330 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1334 * Process message if socket is unlocked; otherwise add to backlog queue
1336 * This code is based on sk_receive_skb(), but must be distinct from it
1337 * since a TIPC-specific filter/reject mechanism is utilized
1340 if (!sock_owned_by_user(sk
)) {
1341 res
= filter_rcv(sk
, buf
);
1343 if (sk_add_backlog(sk
, buf
, rcvbuf_limit(sk
, buf
)))
1344 res
= TIPC_ERR_OVERLOAD
;
1354 * wakeupdispatch - wake up port after congestion
1355 * @tport: port to wakeup
1357 * Called with port lock already taken.
1359 static void wakeupdispatch(struct tipc_port
*tport
)
1361 struct sock
*sk
= (struct sock
*)tport
->usr_handle
;
1363 sk
->sk_write_space(sk
);
1367 * connect - establish a connection to another TIPC port
1368 * @sock: socket structure
1369 * @dest: socket address for destination port
1370 * @destlen: size of socket address data structure
1371 * @flags: file-related flags associated with socket
1373 * Returns 0 on success, errno otherwise
1375 static int connect(struct socket
*sock
, struct sockaddr
*dest
, int destlen
,
1378 struct sock
*sk
= sock
->sk
;
1379 struct sockaddr_tipc
*dst
= (struct sockaddr_tipc
*)dest
;
1380 struct msghdr m
= {NULL
,};
1381 unsigned int timeout
;
1386 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1387 if (sock
->state
== SS_READY
) {
1393 * Reject connection attempt using multicast address
1395 * Note: send_msg() validates the rest of the address fields,
1396 * so there's no need to do it here
1398 if (dst
->addrtype
== TIPC_ADDR_MCAST
) {
1403 timeout
= (flags
& O_NONBLOCK
) ? 0 : tipc_sk(sk
)->conn_timeout
;
1405 switch (sock
->state
) {
1406 case SS_UNCONNECTED
:
1407 /* Send a 'SYN-' to destination */
1409 m
.msg_namelen
= destlen
;
1411 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1412 * indicate send_msg() is never blocked.
1415 m
.msg_flags
= MSG_DONTWAIT
;
1417 res
= send_msg(NULL
, sock
, &m
, 0);
1418 if ((res
< 0) && (res
!= -EWOULDBLOCK
))
1421 /* Just entered SS_CONNECTING state; the only
1422 * difference is that return value in non-blocking
1423 * case is EINPROGRESS, rather than EALREADY.
1438 if (sock
->state
== SS_CONNECTING
) {
1442 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1444 res
= wait_event_interruptible_timeout(*sk_sleep(sk
),
1445 sock
->state
!= SS_CONNECTING
,
1446 timeout
? (long)msecs_to_jiffies(timeout
)
1447 : MAX_SCHEDULE_TIMEOUT
);
1453 ; /* leave "res" unchanged */
1458 if (unlikely(sock
->state
== SS_DISCONNECTING
))
1459 res
= sock_error(sk
);
1469 * listen - allow socket to listen for incoming connections
1470 * @sock: socket structure
1473 * Returns 0 on success, errno otherwise
1475 static int listen(struct socket
*sock
, int len
)
1477 struct sock
*sk
= sock
->sk
;
1482 if (sock
->state
!= SS_UNCONNECTED
)
1485 sock
->state
= SS_LISTENING
;
1494 * accept - wait for connection request
1495 * @sock: listening socket
1496 * @newsock: new socket that is to be connected
1497 * @flags: file-related flags associated with socket
1499 * Returns 0 on success, errno otherwise
1501 static int accept(struct socket
*sock
, struct socket
*new_sock
, int flags
)
1503 struct sock
*new_sk
, *sk
= sock
->sk
;
1504 struct sk_buff
*buf
;
1505 struct tipc_sock
*new_tsock
;
1506 struct tipc_port
*new_tport
;
1507 struct tipc_msg
*msg
;
1514 if (sock
->state
!= SS_LISTENING
) {
1519 while (skb_queue_empty(&sk
->sk_receive_queue
)) {
1520 if (flags
& O_NONBLOCK
) {
1525 res
= wait_event_interruptible(*sk_sleep(sk
),
1526 (!skb_queue_empty(&sk
->sk_receive_queue
)));
1532 buf
= skb_peek(&sk
->sk_receive_queue
);
1534 res
= tipc_create(sock_net(sock
->sk
), new_sock
, 0, 0);
1538 new_sk
= new_sock
->sk
;
1539 new_tsock
= tipc_sk(new_sk
);
1540 new_tport
= new_tsock
->p
;
1541 new_ref
= new_tport
->ref
;
1544 /* we lock on new_sk; but lockdep sees the lock on sk */
1545 lock_sock_nested(new_sk
, SINGLE_DEPTH_NESTING
);
1548 * Reject any stray messages received by new socket
1549 * before the socket lock was taken (very, very unlikely)
1551 reject_rx_queue(new_sk
);
1553 /* Connect new socket to it's peer */
1554 new_tsock
->peer_name
.ref
= msg_origport(msg
);
1555 new_tsock
->peer_name
.node
= msg_orignode(msg
);
1556 tipc_connect(new_ref
, &new_tsock
->peer_name
);
1557 new_sock
->state
= SS_CONNECTED
;
1559 tipc_set_portimportance(new_ref
, msg_importance(msg
));
1560 if (msg_named(msg
)) {
1561 new_tport
->conn_type
= msg_nametype(msg
);
1562 new_tport
->conn_instance
= msg_nameinst(msg
);
1566 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1567 * Respond to 'SYN+' by queuing it on new socket.
1569 if (!msg_data_sz(msg
)) {
1570 struct msghdr m
= {NULL
,};
1572 advance_rx_queue(sk
);
1573 send_packet(NULL
, new_sock
, &m
, 0);
1575 __skb_dequeue(&sk
->sk_receive_queue
);
1576 __skb_queue_head(&new_sk
->sk_receive_queue
, buf
);
1577 skb_set_owner_r(buf
, new_sk
);
1579 release_sock(new_sk
);
1587 * shutdown - shutdown socket connection
1588 * @sock: socket structure
1589 * @how: direction to close (must be SHUT_RDWR)
1591 * Terminates connection (if necessary), then purges socket's receive queue.
1593 * Returns 0 on success, errno otherwise
1595 static int shutdown(struct socket
*sock
, int how
)
1597 struct sock
*sk
= sock
->sk
;
1598 struct tipc_port
*tport
= tipc_sk_port(sk
);
1599 struct sk_buff
*buf
;
1602 if (how
!= SHUT_RDWR
)
1607 switch (sock
->state
) {
1612 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1613 buf
= __skb_dequeue(&sk
->sk_receive_queue
);
1615 if (TIPC_SKB_CB(buf
)->handle
!= 0) {
1619 tipc_disconnect(tport
->ref
);
1620 tipc_reject_msg(buf
, TIPC_CONN_SHUTDOWN
);
1622 tipc_shutdown(tport
->ref
);
1625 sock
->state
= SS_DISCONNECTING
;
1629 case SS_DISCONNECTING
:
1631 /* Discard any unreceived messages */
1632 __skb_queue_purge(&sk
->sk_receive_queue
);
1634 /* Wake up anyone sleeping in poll */
1635 sk
->sk_state_change(sk
);
1648 * setsockopt - set socket option
1649 * @sock: socket structure
1650 * @lvl: option level
1651 * @opt: option identifier
1652 * @ov: pointer to new option value
1653 * @ol: length of option value
1655 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1656 * (to ease compatibility).
1658 * 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 res
= get_user(value
, (u32 __user
*)ov
);
1681 case TIPC_IMPORTANCE
:
1682 res
= tipc_set_portimportance(tport
->ref
, value
);
1684 case TIPC_SRC_DROPPABLE
:
1685 if (sock
->type
!= SOCK_STREAM
)
1686 res
= tipc_set_portunreliable(tport
->ref
, value
);
1690 case TIPC_DEST_DROPPABLE
:
1691 res
= tipc_set_portunreturnable(tport
->ref
, value
);
1693 case TIPC_CONN_TIMEOUT
:
1694 tipc_sk(sk
)->conn_timeout
= value
;
1695 /* no need to set "res", since already 0 at this point */
1707 * getsockopt - get socket option
1708 * @sock: socket structure
1709 * @lvl: option level
1710 * @opt: option identifier
1711 * @ov: receptacle for option value
1712 * @ol: receptacle for length of option value
1714 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1715 * (to ease compatibility).
1717 * 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 res
= get_user(len
, ol
);
1739 case TIPC_IMPORTANCE
:
1740 res
= tipc_portimportance(tport
->ref
, &value
);
1742 case TIPC_SRC_DROPPABLE
:
1743 res
= tipc_portunreliable(tport
->ref
, &value
);
1745 case TIPC_DEST_DROPPABLE
:
1746 res
= tipc_portunreturnable(tport
->ref
, &value
);
1748 case TIPC_CONN_TIMEOUT
:
1749 value
= tipc_sk(sk
)->conn_timeout
;
1750 /* no need to set "res", since already 0 at this point */
1752 case TIPC_NODE_RECVQ_DEPTH
:
1753 value
= 0; /* was tipc_queue_size, now obsolete */
1755 case TIPC_SOCK_RECVQ_DEPTH
:
1756 value
= skb_queue_len(&sk
->sk_receive_queue
);
1765 return res
; /* "get" failed */
1767 if (len
< sizeof(value
))
1770 if (copy_to_user(ov
, &value
, sizeof(value
)))
1773 return put_user(sizeof(value
), ol
);
1776 /* Protocol switches for the various types of TIPC sockets */
1778 static const struct proto_ops msg_ops
= {
1779 .owner
= THIS_MODULE
,
1784 .socketpair
= sock_no_socketpair
,
1785 .accept
= sock_no_accept
,
1786 .getname
= get_name
,
1788 .ioctl
= sock_no_ioctl
,
1789 .listen
= sock_no_listen
,
1790 .shutdown
= shutdown
,
1791 .setsockopt
= setsockopt
,
1792 .getsockopt
= getsockopt
,
1793 .sendmsg
= send_msg
,
1794 .recvmsg
= recv_msg
,
1795 .mmap
= sock_no_mmap
,
1796 .sendpage
= sock_no_sendpage
1799 static const struct proto_ops packet_ops
= {
1800 .owner
= THIS_MODULE
,
1805 .socketpair
= sock_no_socketpair
,
1807 .getname
= get_name
,
1809 .ioctl
= sock_no_ioctl
,
1811 .shutdown
= shutdown
,
1812 .setsockopt
= setsockopt
,
1813 .getsockopt
= getsockopt
,
1814 .sendmsg
= send_packet
,
1815 .recvmsg
= recv_msg
,
1816 .mmap
= sock_no_mmap
,
1817 .sendpage
= sock_no_sendpage
1820 static const struct proto_ops stream_ops
= {
1821 .owner
= THIS_MODULE
,
1826 .socketpair
= sock_no_socketpair
,
1828 .getname
= get_name
,
1830 .ioctl
= sock_no_ioctl
,
1832 .shutdown
= shutdown
,
1833 .setsockopt
= setsockopt
,
1834 .getsockopt
= getsockopt
,
1835 .sendmsg
= send_stream
,
1836 .recvmsg
= recv_stream
,
1837 .mmap
= sock_no_mmap
,
1838 .sendpage
= sock_no_sendpage
1841 static const struct net_proto_family tipc_family_ops
= {
1842 .owner
= THIS_MODULE
,
1844 .create
= tipc_create
1847 static struct proto tipc_proto
= {
1849 .owner
= THIS_MODULE
,
1850 .obj_size
= sizeof(struct tipc_sock
),
1851 .sysctl_rmem
= sysctl_tipc_rmem
1855 * tipc_socket_init - initialize TIPC socket interface
1857 * Returns 0 on success, errno otherwise
1859 int tipc_socket_init(void)
1863 res
= proto_register(&tipc_proto
, 1);
1865 pr_err("Failed to register TIPC protocol type\n");
1869 res
= sock_register(&tipc_family_ops
);
1871 pr_err("Failed to register TIPC socket type\n");
1872 proto_unregister(&tipc_proto
);
1876 sockets_enabled
= 1;
1882 * tipc_socket_stop - stop TIPC socket interface
1884 void tipc_socket_stop(void)
1886 if (!sockets_enabled
)
1889 sockets_enabled
= 0;
1890 sock_unregister(tipc_family_ops
.family
);
1891 proto_unregister(&tipc_proto
);