2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012 Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, 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 static int backlog_rcv(struct sock *sk, struct sk_buff *skb);
59 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf);
60 static void wakeupdispatch(struct tipc_port *tport);
61 static void tipc_data_ready(struct sock *sk, int len);
62 static void tipc_write_space(struct sock *sk);
63 static int release(struct socket *sock);
64 static int accept(struct socket *sock, struct socket *new_sock, int flags);
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;
71 static struct proto tipc_proto_kern;
74 * Revised TIPC socket locking policy:
76 * Most socket operations take the standard socket lock when they start
77 * and hold it until they finish (or until they need to sleep). Acquiring
78 * this lock grants the owner exclusive access to the fields of the socket
79 * data structures, with the exception of the backlog queue. A few socket
80 * operations can be done without taking the socket lock because they only
81 * read socket information that never changes during the life of the socket.
83 * Socket operations may acquire the lock for the associated TIPC port if they
84 * need to perform an operation on the port. If any routine needs to acquire
85 * both the socket lock and the port lock it must take the socket lock first
86 * to avoid the risk of deadlock.
88 * The dispatcher handling incoming messages cannot grab the socket lock in
89 * the standard fashion, since invoked it runs at the BH level and cannot block.
90 * Instead, it checks to see if the socket lock is currently owned by someone,
91 * and either handles the message itself or adds it to the socket's backlog
92 * queue; in the latter case the queued message is processed once the process
93 * owning the socket lock releases it.
95 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
96 * the problem of a blocked socket operation preventing any other operations
97 * from occurring. However, applications must be careful if they have
98 * multiple threads trying to send (or receive) on the same socket, as these
99 * operations might interfere with each other. For example, doing a connect
100 * and a receive at the same time might allow the receive to consume the
101 * ACK message meant for the connect. While additional work could be done
102 * to try and overcome this, it doesn't seem to be worthwhile at the present.
104 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
105 * that another operation that must be performed in a non-blocking manner is
106 * not delayed for very long because the lock has already been taken.
108 * NOTE: This code assumes that certain fields of a port/socket pair are
109 * constant over its lifetime; such fields can be examined without taking
110 * the socket lock and/or port lock, and do not need to be re-read even
111 * after resuming processing after waiting. These fields include:
113 * - pointer to socket sk structure (aka tipc_sock structure)
114 * - pointer to port structure
119 * advance_rx_queue - discard first buffer in socket receive queue
121 * Caller must hold socket lock
123 static void advance_rx_queue(struct sock *sk)
125 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
129 * reject_rx_queue - reject all buffers in socket receive queue
131 * Caller must hold socket lock
133 static void reject_rx_queue(struct sock *sk)
137 while ((buf = __skb_dequeue(&sk->sk_receive_queue)))
138 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
142 * tipc_sk_create - create a TIPC socket
143 * @net: network namespace (must be default network)
144 * @sock: pre-allocated socket structure
145 * @protocol: protocol indicator (must be 0)
146 * @kern: caused by kernel or by userspace?
148 * This routine creates additional data structures used by the TIPC socket,
149 * initializes them, and links them together.
151 * Returns 0 on success, errno otherwise
153 static int tipc_sk_create(struct net *net, struct socket *sock, int protocol,
156 const struct proto_ops *ops;
159 struct tipc_port *tp_ptr;
161 /* Validate arguments */
162 if (unlikely(protocol != 0))
163 return -EPROTONOSUPPORT;
165 switch (sock->type) {
168 state = SS_UNCONNECTED;
172 state = SS_UNCONNECTED;
183 /* Allocate socket's protocol area */
185 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
187 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
192 /* Allocate TIPC port for socket to use */
193 tp_ptr = tipc_createport(sk, &dispatch, &wakeupdispatch,
194 TIPC_LOW_IMPORTANCE);
195 if (unlikely(!tp_ptr)) {
200 /* Finish initializing socket data structures */
204 sock_init_data(sock, sk);
205 sk->sk_backlog_rcv = backlog_rcv;
206 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
207 sk->sk_data_ready = tipc_data_ready;
208 sk->sk_write_space = tipc_write_space;
209 tipc_sk(sk)->p = tp_ptr;
210 tipc_sk(sk)->conn_timeout = CONN_TIMEOUT_DEFAULT;
212 spin_unlock_bh(tp_ptr->lock);
214 if (sock->state == SS_READY) {
215 tipc_set_portunreturnable(tp_ptr->ref, 1);
216 if (sock->type == SOCK_DGRAM)
217 tipc_set_portunreliable(tp_ptr->ref, 1);
224 * tipc_sock_create_local - create TIPC socket from inside TIPC module
225 * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
227 * We cannot use sock_creat_kern here because it bumps module user count.
228 * Since socket owner and creator is the same module we must make sure
229 * that module count remains zero for module local sockets, otherwise
230 * we cannot do rmmod.
232 * Returns 0 on success, errno otherwise
234 int tipc_sock_create_local(int type, struct socket **res)
238 rc = sock_create_lite(AF_TIPC, type, 0, res);
240 pr_err("Failed to create kernel socket\n");
243 tipc_sk_create(&init_net, *res, 0, 1);
249 * tipc_sock_release_local - release socket created by tipc_sock_create_local
250 * @sock: the socket to be released.
252 * Module reference count is not incremented when such sockets are created,
253 * so we must keep it from being decremented when they are released.
255 void tipc_sock_release_local(struct socket *sock)
263 * tipc_sock_accept_local - accept a connection on a socket created
264 * with tipc_sock_create_local. Use this function to avoid that
265 * module reference count is inadvertently incremented.
267 * @sock: the accepting socket
268 * @newsock: reference to the new socket to be created
269 * @flags: socket flags
272 int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
275 struct sock *sk = sock->sk;
278 ret = sock_create_lite(sk->sk_family, sk->sk_type,
279 sk->sk_protocol, newsock);
283 ret = accept(sock, *newsock, flags);
285 sock_release(*newsock);
288 (*newsock)->ops = sock->ops;
293 * release - destroy a TIPC socket
294 * @sock: socket to destroy
296 * This routine cleans up any messages that are still queued on the socket.
297 * For DGRAM and RDM socket types, all queued messages are rejected.
298 * For SEQPACKET and STREAM socket types, the first message is rejected
299 * and any others are discarded. (If the first message on a STREAM socket
300 * is partially-read, it is discarded and the next one is rejected instead.)
302 * NOTE: Rejected messages are not necessarily returned to the sender! They
303 * are returned or discarded according to the "destination droppable" setting
304 * specified for the message by the sender.
306 * Returns 0 on success, errno otherwise
308 static int release(struct socket *sock)
310 struct sock *sk = sock->sk;
311 struct tipc_port *tport;
316 * Exit if socket isn't fully initialized (occurs when a failed accept()
317 * releases a pre-allocated child socket that was never used)
322 tport = tipc_sk_port(sk);
326 * Reject all unreceived messages, except on an active connection
327 * (which disconnects locally & sends a 'FIN+' to peer)
329 while (sock->state != SS_DISCONNECTING) {
330 buf = __skb_dequeue(&sk->sk_receive_queue);
333 if (TIPC_SKB_CB(buf)->handle != NULL)
336 if ((sock->state == SS_CONNECTING) ||
337 (sock->state == SS_CONNECTED)) {
338 sock->state = SS_DISCONNECTING;
339 tipc_disconnect(tport->ref);
341 tipc_reject_msg(buf, TIPC_ERR_NO_PORT);
346 * Delete TIPC port; this ensures no more messages are queued
347 * (also disconnects an active connection & sends a 'FIN-' to peer)
349 res = tipc_deleteport(tport);
351 /* Discard any remaining (connection-based) messages in receive queue */
352 __skb_queue_purge(&sk->sk_receive_queue);
354 /* Reject any messages that accumulated in backlog queue */
355 sock->state = SS_DISCONNECTING;
365 * bind - associate or disassocate TIPC name(s) with a socket
366 * @sock: socket structure
367 * @uaddr: socket address describing name(s) and desired operation
368 * @uaddr_len: size of socket address data structure
370 * Name and name sequence binding is indicated using a positive scope value;
371 * a negative scope value unbinds the specified name. Specifying no name
372 * (i.e. a socket address length of 0) unbinds all names from the socket.
374 * Returns 0 on success, errno otherwise
376 * NOTE: This routine doesn't need to take the socket lock since it doesn't
377 * access any non-constant socket information.
379 static int bind(struct socket *sock, struct sockaddr *uaddr, int uaddr_len)
381 struct sock *sk = sock->sk;
382 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
383 struct tipc_port *tport = tipc_sk_port(sock->sk);
387 if (unlikely(!uaddr_len)) {
388 res = tipc_withdraw(tport, 0, NULL);
392 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
396 if (addr->family != AF_TIPC) {
401 if (addr->addrtype == TIPC_ADDR_NAME)
402 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
403 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
408 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
409 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
410 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
415 res = (addr->scope > 0) ?
416 tipc_publish(tport, addr->scope, &addr->addr.nameseq) :
417 tipc_withdraw(tport, -addr->scope, &addr->addr.nameseq);
424 * get_name - get port ID of socket or peer socket
425 * @sock: socket structure
426 * @uaddr: area for returned socket address
427 * @uaddr_len: area for returned length of socket address
428 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
430 * Returns 0 on success, errno otherwise
432 * NOTE: This routine doesn't need to take the socket lock since it only
433 * accesses socket information that is unchanging (or which changes in
434 * a completely predictable manner).
436 static int get_name(struct socket *sock, struct sockaddr *uaddr,
437 int *uaddr_len, int peer)
439 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
440 struct tipc_sock *tsock = tipc_sk(sock->sk);
442 memset(addr, 0, sizeof(*addr));
444 if ((sock->state != SS_CONNECTED) &&
445 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
447 addr->addr.id.ref = tsock->peer_name.ref;
448 addr->addr.id.node = tsock->peer_name.node;
450 addr->addr.id.ref = tsock->p->ref;
451 addr->addr.id.node = tipc_own_addr;
454 *uaddr_len = sizeof(*addr);
455 addr->addrtype = TIPC_ADDR_ID;
456 addr->family = AF_TIPC;
458 addr->addr.name.domain = 0;
464 * poll - read and possibly block on pollmask
465 * @file: file structure associated with the socket
466 * @sock: socket for which to calculate the poll bits
469 * Returns pollmask value
472 * It appears that the usual socket locking mechanisms are not useful here
473 * since the pollmask info is potentially out-of-date the moment this routine
474 * exits. TCP and other protocols seem to rely on higher level poll routines
475 * to handle any preventable race conditions, so TIPC will do the same ...
477 * TIPC sets the returned events as follows:
479 * socket state flags set
480 * ------------ ---------
481 * unconnected no read flags
482 * POLLOUT if port is not congested
484 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
487 * connected POLLIN/POLLRDNORM if data in rx queue
488 * POLLOUT if port is not congested
490 * disconnecting POLLIN/POLLRDNORM/POLLHUP
493 * listening POLLIN if SYN in rx queue
496 * ready POLLIN/POLLRDNORM if data in rx queue
497 * [connectionless] POLLOUT (since port cannot be congested)
499 * IMPORTANT: The fact that a read or write operation is indicated does NOT
500 * imply that the operation will succeed, merely that it should be performed
501 * and will not block.
503 static unsigned int poll(struct file *file, struct socket *sock,
506 struct sock *sk = sock->sk;
509 sock_poll_wait(file, sk_sleep(sk), wait);
511 switch ((int)sock->state) {
513 if (!tipc_sk_port(sk)->congested)
518 if (!tipc_sk_port(sk)->congested)
523 if (!skb_queue_empty(&sk->sk_receive_queue))
524 mask |= (POLLIN | POLLRDNORM);
526 case SS_DISCONNECTING:
527 mask = (POLLIN | POLLRDNORM | POLLHUP);
535 * dest_name_check - verify user is permitted to send to specified port name
536 * @dest: destination address
537 * @m: descriptor for message to be sent
539 * Prevents restricted configuration commands from being issued by
540 * unauthorized users.
542 * Returns 0 if permission is granted, otherwise errno
544 static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
546 struct tipc_cfg_msg_hdr hdr;
548 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
550 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
552 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
555 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
557 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
559 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
565 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
567 struct sock *sk = sock->sk;
568 struct tipc_port *tport = tipc_sk_port(sk);
573 int err = sock_error(sk);
576 if (sock->state == SS_DISCONNECTING)
580 if (signal_pending(current))
581 return sock_intr_errno(*timeo_p);
583 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
584 done = sk_wait_event(sk, timeo_p, !tport->congested);
585 finish_wait(sk_sleep(sk), &wait);
591 * send_msg - send message in connectionless manner
592 * @iocb: if NULL, indicates that socket lock is already held
593 * @sock: socket structure
594 * @m: message to send
595 * @total_len: length of message
597 * Message must have an destination specified explicitly.
598 * Used for SOCK_RDM and SOCK_DGRAM messages,
599 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
600 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
602 * Returns the number of bytes sent on success, or errno otherwise
604 static int send_msg(struct kiocb *iocb, struct socket *sock,
605 struct msghdr *m, size_t total_len)
607 struct sock *sk = sock->sk;
608 struct tipc_port *tport = tipc_sk_port(sk);
609 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
615 return -EDESTADDRREQ;
616 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
617 (dest->family != AF_TIPC)))
619 if (total_len > TIPC_MAX_USER_MSG_SIZE)
625 needs_conn = (sock->state != SS_READY);
626 if (unlikely(needs_conn)) {
627 if (sock->state == SS_LISTENING) {
631 if (sock->state != SS_UNCONNECTED) {
635 if (tport->published) {
639 if (dest->addrtype == TIPC_ADDR_NAME) {
640 tport->conn_type = dest->addr.name.name.type;
641 tport->conn_instance = dest->addr.name.name.instance;
644 /* Abort any pending connection attempts (very unlikely) */
648 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
650 if (dest->addrtype == TIPC_ADDR_NAME) {
651 res = dest_name_check(dest, m);
654 res = tipc_send2name(tport->ref,
655 &dest->addr.name.name,
656 dest->addr.name.domain,
659 } else if (dest->addrtype == TIPC_ADDR_ID) {
660 res = tipc_send2port(tport->ref,
664 } else if (dest->addrtype == TIPC_ADDR_MCAST) {
669 res = dest_name_check(dest, m);
672 res = tipc_multicast(tport->ref,
677 if (likely(res != -ELINKCONG)) {
678 if (needs_conn && (res >= 0))
679 sock->state = SS_CONNECTING;
682 res = tipc_wait_for_sndmsg(sock, &timeo);
693 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
695 struct sock *sk = sock->sk;
696 struct tipc_port *tport = tipc_sk_port(sk);
701 int err = sock_error(sk);
704 if (sock->state == SS_DISCONNECTING)
706 else if (sock->state != SS_CONNECTED)
710 if (signal_pending(current))
711 return sock_intr_errno(*timeo_p);
713 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
714 done = sk_wait_event(sk, timeo_p,
715 (!tport->congested || !tport->connected));
716 finish_wait(sk_sleep(sk), &wait);
722 * send_packet - send a connection-oriented message
723 * @iocb: if NULL, indicates that socket lock is already held
724 * @sock: socket structure
725 * @m: message to send
726 * @total_len: length of message
728 * Used for SOCK_SEQPACKET messages and SOCK_STREAM data.
730 * Returns the number of bytes sent on success, or errno otherwise
732 static int send_packet(struct kiocb *iocb, struct socket *sock,
733 struct msghdr *m, size_t total_len)
735 struct sock *sk = sock->sk;
736 struct tipc_port *tport = tipc_sk_port(sk);
737 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
741 /* Handle implied connection establishment */
743 return send_msg(iocb, sock, m, total_len);
745 if (total_len > TIPC_MAX_USER_MSG_SIZE)
751 if (unlikely(sock->state != SS_CONNECTED)) {
752 if (sock->state == SS_DISCONNECTING)
759 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
761 res = tipc_send(tport->ref, m->msg_iov, total_len);
762 if (likely(res != -ELINKCONG))
764 res = tipc_wait_for_sndpkt(sock, &timeo);
775 * send_stream - send stream-oriented data
777 * @sock: socket structure
779 * @total_len: total length of data to be sent
781 * Used for SOCK_STREAM data.
783 * Returns the number of bytes sent on success (or partial success),
784 * or errno if no data sent
786 static int send_stream(struct kiocb *iocb, struct socket *sock,
787 struct msghdr *m, size_t total_len)
789 struct sock *sk = sock->sk;
790 struct tipc_port *tport = tipc_sk_port(sk);
791 struct msghdr my_msg;
793 struct iovec *curr_iov;
795 char __user *curr_start;
804 /* Handle special cases where there is no connection */
805 if (unlikely(sock->state != SS_CONNECTED)) {
806 if (sock->state == SS_UNCONNECTED)
807 res = send_packet(NULL, sock, m, total_len);
809 res = sock->state == SS_DISCONNECTING ? -EPIPE : -ENOTCONN;
813 if (unlikely(m->msg_name)) {
818 if (total_len > (unsigned int)INT_MAX) {
824 * Send each iovec entry using one or more messages
826 * Note: This algorithm is good for the most likely case
827 * (i.e. one large iovec entry), but could be improved to pass sets
828 * of small iovec entries into send_packet().
830 curr_iov = m->msg_iov;
831 curr_iovlen = m->msg_iovlen;
832 my_msg.msg_iov = &my_iov;
833 my_msg.msg_iovlen = 1;
834 my_msg.msg_flags = m->msg_flags;
835 my_msg.msg_name = NULL;
838 hdr_size = msg_hdr_sz(&tport->phdr);
840 while (curr_iovlen--) {
841 curr_start = curr_iov->iov_base;
842 curr_left = curr_iov->iov_len;
845 bytes_to_send = tport->max_pkt - hdr_size;
846 if (bytes_to_send > TIPC_MAX_USER_MSG_SIZE)
847 bytes_to_send = TIPC_MAX_USER_MSG_SIZE;
848 if (curr_left < bytes_to_send)
849 bytes_to_send = curr_left;
850 my_iov.iov_base = curr_start;
851 my_iov.iov_len = bytes_to_send;
852 res = send_packet(NULL, sock, &my_msg, bytes_to_send);
858 curr_left -= bytes_to_send;
859 curr_start += bytes_to_send;
860 bytes_sent += bytes_to_send;
872 * auto_connect - complete connection setup to a remote port
873 * @sock: socket structure
874 * @msg: peer's response message
876 * Returns 0 on success, errno otherwise
878 static int auto_connect(struct socket *sock, struct tipc_msg *msg)
880 struct tipc_sock *tsock = tipc_sk(sock->sk);
881 struct tipc_port *p_ptr;
883 tsock->peer_name.ref = msg_origport(msg);
884 tsock->peer_name.node = msg_orignode(msg);
885 p_ptr = tipc_port_deref(tsock->p->ref);
889 __tipc_connect(tsock->p->ref, p_ptr, &tsock->peer_name);
891 if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
893 msg_set_importance(&p_ptr->phdr, (u32)msg_importance(msg));
894 sock->state = SS_CONNECTED;
899 * set_orig_addr - capture sender's address for received message
900 * @m: descriptor for message info
901 * @msg: received message header
903 * Note: Address is not captured if not requested by receiver.
905 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
907 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
910 addr->family = AF_TIPC;
911 addr->addrtype = TIPC_ADDR_ID;
912 memset(&addr->addr, 0, sizeof(addr->addr));
913 addr->addr.id.ref = msg_origport(msg);
914 addr->addr.id.node = msg_orignode(msg);
915 addr->addr.name.domain = 0; /* could leave uninitialized */
916 addr->scope = 0; /* could leave uninitialized */
917 m->msg_namelen = sizeof(struct sockaddr_tipc);
922 * anc_data_recv - optionally capture ancillary data for received message
923 * @m: descriptor for message info
924 * @msg: received message header
925 * @tport: TIPC port associated with message
927 * Note: Ancillary data is not captured if not requested by receiver.
929 * Returns 0 if successful, otherwise errno
931 static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
932 struct tipc_port *tport)
940 if (likely(m->msg_controllen == 0))
943 /* Optionally capture errored message object(s) */
944 err = msg ? msg_errcode(msg) : 0;
947 anc_data[1] = msg_data_sz(msg);
948 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
952 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
959 /* Optionally capture message destination object */
960 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
964 anc_data[0] = msg_nametype(msg);
965 anc_data[1] = msg_namelower(msg);
966 anc_data[2] = msg_namelower(msg);
970 anc_data[0] = msg_nametype(msg);
971 anc_data[1] = msg_namelower(msg);
972 anc_data[2] = msg_nameupper(msg);
975 has_name = (tport->conn_type != 0);
976 anc_data[0] = tport->conn_type;
977 anc_data[1] = tport->conn_instance;
978 anc_data[2] = tport->conn_instance;
984 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
992 static int tipc_wait_for_rcvmsg(struct socket *sock, long timeo)
994 struct sock *sk = sock->sk;
999 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1000 if (skb_queue_empty(&sk->sk_receive_queue)) {
1001 if (sock->state == SS_DISCONNECTING) {
1006 timeo = schedule_timeout(timeo);
1010 if (!skb_queue_empty(&sk->sk_receive_queue))
1012 err = sock_intr_errno(timeo);
1013 if (signal_pending(current))
1019 finish_wait(sk_sleep(sk), &wait);
1024 * recv_msg - receive packet-oriented message
1026 * @m: descriptor for message info
1027 * @buf_len: total size of user buffer area
1028 * @flags: receive flags
1030 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1031 * If the complete message doesn't fit in user area, truncate it.
1033 * Returns size of returned message data, errno otherwise
1035 static int recv_msg(struct kiocb *iocb, struct socket *sock,
1036 struct msghdr *m, size_t buf_len, int flags)
1038 struct sock *sk = sock->sk;
1039 struct tipc_port *tport = tipc_sk_port(sk);
1040 struct sk_buff *buf;
1041 struct tipc_msg *msg;
1047 /* Catch invalid receive requests */
1048 if (unlikely(!buf_len))
1053 if (unlikely(sock->state == SS_UNCONNECTED)) {
1058 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1061 /* Look for a message in receive queue; wait if necessary */
1062 res = tipc_wait_for_rcvmsg(sock, timeo);
1066 /* Look at first message in receive queue */
1067 buf = skb_peek(&sk->sk_receive_queue);
1069 sz = msg_data_sz(msg);
1070 err = msg_errcode(msg);
1072 /* Discard an empty non-errored message & try again */
1073 if ((!sz) && (!err)) {
1074 advance_rx_queue(sk);
1078 /* Capture sender's address (optional) */
1079 set_orig_addr(m, msg);
1081 /* Capture ancillary data (optional) */
1082 res = anc_data_recv(m, msg, tport);
1086 /* Capture message data (if valid) & compute return value (always) */
1088 if (unlikely(buf_len < sz)) {
1090 m->msg_flags |= MSG_TRUNC;
1092 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
1098 if ((sock->state == SS_READY) ||
1099 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1105 /* Consume received message (optional) */
1106 if (likely(!(flags & MSG_PEEK))) {
1107 if ((sock->state != SS_READY) &&
1108 (++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1109 tipc_acknowledge(tport->ref, tport->conn_unacked);
1110 advance_rx_queue(sk);
1118 * recv_stream - receive stream-oriented data
1120 * @m: descriptor for message info
1121 * @buf_len: total size of user buffer area
1122 * @flags: receive flags
1124 * Used for SOCK_STREAM messages only. If not enough data is available
1125 * will optionally wait for more; never truncates data.
1127 * Returns size of returned message data, errno otherwise
1129 static int recv_stream(struct kiocb *iocb, struct socket *sock,
1130 struct msghdr *m, size_t buf_len, int flags)
1132 struct sock *sk = sock->sk;
1133 struct tipc_port *tport = tipc_sk_port(sk);
1134 struct sk_buff *buf;
1135 struct tipc_msg *msg;
1138 int sz_to_copy, target, needed;
1143 /* Catch invalid receive attempts */
1144 if (unlikely(!buf_len))
1149 if (unlikely(sock->state == SS_UNCONNECTED)) {
1154 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1155 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1158 /* Look for a message in receive queue; wait if necessary */
1159 res = tipc_wait_for_rcvmsg(sock, timeo);
1163 /* Look at first message in receive queue */
1164 buf = skb_peek(&sk->sk_receive_queue);
1166 sz = msg_data_sz(msg);
1167 err = msg_errcode(msg);
1169 /* Discard an empty non-errored message & try again */
1170 if ((!sz) && (!err)) {
1171 advance_rx_queue(sk);
1175 /* Optionally capture sender's address & ancillary data of first msg */
1176 if (sz_copied == 0) {
1177 set_orig_addr(m, msg);
1178 res = anc_data_recv(m, msg, tport);
1183 /* Capture message data (if valid) & compute return value (always) */
1185 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1188 needed = (buf_len - sz_copied);
1189 sz_to_copy = (sz <= needed) ? sz : needed;
1191 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1192 m->msg_iov, sz_to_copy);
1196 sz_copied += sz_to_copy;
1198 if (sz_to_copy < sz) {
1199 if (!(flags & MSG_PEEK))
1200 TIPC_SKB_CB(buf)->handle =
1201 (void *)(unsigned long)(offset + sz_to_copy);
1206 goto exit; /* can't add error msg to valid data */
1208 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1214 /* Consume received message (optional) */
1215 if (likely(!(flags & MSG_PEEK))) {
1216 if (unlikely(++tport->conn_unacked >= TIPC_FLOW_CONTROL_WIN))
1217 tipc_acknowledge(tport->ref, tport->conn_unacked);
1218 advance_rx_queue(sk);
1221 /* Loop around if more data is required */
1222 if ((sz_copied < buf_len) && /* didn't get all requested data */
1223 (!skb_queue_empty(&sk->sk_receive_queue) ||
1224 (sz_copied < target)) && /* and more is ready or required */
1225 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1226 (!err)) /* and haven't reached a FIN */
1231 return sz_copied ? sz_copied : res;
1235 * tipc_write_space - wake up thread if port congestion is released
1238 static void tipc_write_space(struct sock *sk)
1240 struct socket_wq *wq;
1243 wq = rcu_dereference(sk->sk_wq);
1244 if (wq_has_sleeper(wq))
1245 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1246 POLLWRNORM | POLLWRBAND);
1251 * tipc_data_ready - wake up threads to indicate messages have been received
1253 * @len: the length of messages
1255 static void tipc_data_ready(struct sock *sk, int len)
1257 struct socket_wq *wq;
1260 wq = rcu_dereference(sk->sk_wq);
1261 if (wq_has_sleeper(wq))
1262 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1263 POLLRDNORM | POLLRDBAND);
1268 * filter_connect - Handle all incoming messages for a connection-based socket
1269 * @tsock: TIPC socket
1272 * Returns TIPC error status code and socket error status code
1273 * once it encounters some errors
1275 static u32 filter_connect(struct tipc_sock *tsock, struct sk_buff **buf)
1277 struct socket *sock = tsock->sk.sk_socket;
1278 struct tipc_msg *msg = buf_msg(*buf);
1279 struct sock *sk = &tsock->sk;
1280 u32 retval = TIPC_ERR_NO_PORT;
1286 switch ((int)sock->state) {
1288 /* Accept only connection-based messages sent by peer */
1289 if (msg_connected(msg) && tipc_port_peer_msg(tsock->p, msg)) {
1290 if (unlikely(msg_errcode(msg))) {
1291 sock->state = SS_DISCONNECTING;
1292 __tipc_disconnect(tsock->p);
1298 /* Accept only ACK or NACK message */
1299 if (unlikely(msg_errcode(msg))) {
1300 sock->state = SS_DISCONNECTING;
1301 sk->sk_err = ECONNREFUSED;
1306 if (unlikely(!msg_connected(msg)))
1309 res = auto_connect(sock, msg);
1311 sock->state = SS_DISCONNECTING;
1317 /* If an incoming message is an 'ACK-', it should be
1318 * discarded here because it doesn't contain useful
1319 * data. In addition, we should try to wake up
1320 * connect() routine if sleeping.
1322 if (msg_data_sz(msg) == 0) {
1325 if (waitqueue_active(sk_sleep(sk)))
1326 wake_up_interruptible(sk_sleep(sk));
1331 case SS_UNCONNECTED:
1332 /* Accept only SYN message */
1333 if (!msg_connected(msg) && !(msg_errcode(msg)))
1336 case SS_DISCONNECTING:
1339 pr_err("Unknown socket state %u\n", sock->state);
1345 * rcvbuf_limit - get proper overload limit of socket receive queue
1349 * For all connection oriented messages, irrespective of importance,
1350 * the default overload value (i.e. 67MB) is set as limit.
1352 * For all connectionless messages, by default new queue limits are
1355 * TIPC_LOW_IMPORTANCE (4 MB)
1356 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1357 * TIPC_HIGH_IMPORTANCE (16 MB)
1358 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1360 * Returns overload limit according to corresponding message importance
1362 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1364 struct tipc_msg *msg = buf_msg(buf);
1366 if (msg_connected(msg))
1367 return sysctl_tipc_rmem[2];
1369 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1370 msg_importance(msg);
1374 * filter_rcv - validate incoming message
1378 * Enqueues message on receive queue if acceptable; optionally handles
1379 * disconnect indication for a connected socket.
1381 * Called with socket lock already taken; port lock may also be taken.
1383 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1385 static u32 filter_rcv(struct sock *sk, struct sk_buff *buf)
1387 struct socket *sock = sk->sk_socket;
1388 struct tipc_msg *msg = buf_msg(buf);
1389 unsigned int limit = rcvbuf_limit(sk, buf);
1392 /* Reject message if it is wrong sort of message for socket */
1393 if (msg_type(msg) > TIPC_DIRECT_MSG)
1394 return TIPC_ERR_NO_PORT;
1396 if (sock->state == SS_READY) {
1397 if (msg_connected(msg))
1398 return TIPC_ERR_NO_PORT;
1400 res = filter_connect(tipc_sk(sk), &buf);
1401 if (res != TIPC_OK || buf == NULL)
1405 /* Reject message if there isn't room to queue it */
1406 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1407 return TIPC_ERR_OVERLOAD;
1409 /* Enqueue message */
1410 TIPC_SKB_CB(buf)->handle = NULL;
1411 __skb_queue_tail(&sk->sk_receive_queue, buf);
1412 skb_set_owner_r(buf, sk);
1414 sk->sk_data_ready(sk, 0);
1419 * backlog_rcv - handle incoming message from backlog queue
1423 * Caller must hold socket lock, but not port lock.
1427 static int backlog_rcv(struct sock *sk, struct sk_buff *buf)
1431 res = filter_rcv(sk, buf);
1433 tipc_reject_msg(buf, res);
1438 * dispatch - handle incoming message
1439 * @tport: TIPC port that received message
1442 * Called with port lock already taken.
1444 * Returns TIPC error status code (TIPC_OK if message is not to be rejected)
1446 static u32 dispatch(struct tipc_port *tport, struct sk_buff *buf)
1448 struct sock *sk = tport->sk;
1452 * Process message if socket is unlocked; otherwise add to backlog queue
1454 * This code is based on sk_receive_skb(), but must be distinct from it
1455 * since a TIPC-specific filter/reject mechanism is utilized
1458 if (!sock_owned_by_user(sk)) {
1459 res = filter_rcv(sk, buf);
1461 if (sk_add_backlog(sk, buf, rcvbuf_limit(sk, buf)))
1462 res = TIPC_ERR_OVERLOAD;
1472 * wakeupdispatch - wake up port after congestion
1473 * @tport: port to wakeup
1475 * Called with port lock already taken.
1477 static void wakeupdispatch(struct tipc_port *tport)
1479 struct sock *sk = tport->sk;
1481 sk->sk_write_space(sk);
1484 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1486 struct sock *sk = sock->sk;
1491 int err = sock_error(sk);
1496 if (signal_pending(current))
1497 return sock_intr_errno(*timeo_p);
1499 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1500 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1501 finish_wait(sk_sleep(sk), &wait);
1507 * connect - establish a connection to another TIPC port
1508 * @sock: socket structure
1509 * @dest: socket address for destination port
1510 * @destlen: size of socket address data structure
1511 * @flags: file-related flags associated with socket
1513 * Returns 0 on success, errno otherwise
1515 static int connect(struct socket *sock, struct sockaddr *dest, int destlen,
1518 struct sock *sk = sock->sk;
1519 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1520 struct msghdr m = {NULL,};
1521 long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1522 socket_state previous;
1527 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1528 if (sock->state == SS_READY) {
1534 * Reject connection attempt using multicast address
1536 * Note: send_msg() validates the rest of the address fields,
1537 * so there's no need to do it here
1539 if (dst->addrtype == TIPC_ADDR_MCAST) {
1544 previous = sock->state;
1545 switch (sock->state) {
1546 case SS_UNCONNECTED:
1547 /* Send a 'SYN-' to destination */
1549 m.msg_namelen = destlen;
1551 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1552 * indicate send_msg() is never blocked.
1555 m.msg_flags = MSG_DONTWAIT;
1557 res = send_msg(NULL, sock, &m, 0);
1558 if ((res < 0) && (res != -EWOULDBLOCK))
1561 /* Just entered SS_CONNECTING state; the only
1562 * difference is that return value in non-blocking
1563 * case is EINPROGRESS, rather than EALREADY.
1567 if (previous == SS_CONNECTING)
1571 timeout = msecs_to_jiffies(timeout);
1572 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1573 res = tipc_wait_for_connect(sock, &timeout);
1588 * listen - allow socket to listen for incoming connections
1589 * @sock: socket structure
1592 * Returns 0 on success, errno otherwise
1594 static int listen(struct socket *sock, int len)
1596 struct sock *sk = sock->sk;
1601 if (sock->state != SS_UNCONNECTED)
1604 sock->state = SS_LISTENING;
1612 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1614 struct sock *sk = sock->sk;
1618 /* True wake-one mechanism for incoming connections: only
1619 * one process gets woken up, not the 'whole herd'.
1620 * Since we do not 'race & poll' for established sockets
1621 * anymore, the common case will execute the loop only once.
1624 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1625 TASK_INTERRUPTIBLE);
1626 if (skb_queue_empty(&sk->sk_receive_queue)) {
1628 timeo = schedule_timeout(timeo);
1632 if (!skb_queue_empty(&sk->sk_receive_queue))
1635 if (sock->state != SS_LISTENING)
1637 err = sock_intr_errno(timeo);
1638 if (signal_pending(current))
1644 finish_wait(sk_sleep(sk), &wait);
1649 * accept - wait for connection request
1650 * @sock: listening socket
1651 * @newsock: new socket that is to be connected
1652 * @flags: file-related flags associated with socket
1654 * Returns 0 on success, errno otherwise
1656 static int accept(struct socket *sock, struct socket *new_sock, int flags)
1658 struct sock *new_sk, *sk = sock->sk;
1659 struct sk_buff *buf;
1660 struct tipc_sock *new_tsock;
1661 struct tipc_port *new_tport;
1662 struct tipc_msg *msg;
1669 if (sock->state != SS_LISTENING) {
1674 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1675 res = tipc_wait_for_accept(sock, timeo);
1679 buf = skb_peek(&sk->sk_receive_queue);
1681 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
1685 new_sk = new_sock->sk;
1686 new_tsock = tipc_sk(new_sk);
1687 new_tport = new_tsock->p;
1688 new_ref = new_tport->ref;
1691 /* we lock on new_sk; but lockdep sees the lock on sk */
1692 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
1695 * Reject any stray messages received by new socket
1696 * before the socket lock was taken (very, very unlikely)
1698 reject_rx_queue(new_sk);
1700 /* Connect new socket to it's peer */
1701 new_tsock->peer_name.ref = msg_origport(msg);
1702 new_tsock->peer_name.node = msg_orignode(msg);
1703 tipc_connect(new_ref, &new_tsock->peer_name);
1704 new_sock->state = SS_CONNECTED;
1706 tipc_set_portimportance(new_ref, msg_importance(msg));
1707 if (msg_named(msg)) {
1708 new_tport->conn_type = msg_nametype(msg);
1709 new_tport->conn_instance = msg_nameinst(msg);
1713 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
1714 * Respond to 'SYN+' by queuing it on new socket.
1716 if (!msg_data_sz(msg)) {
1717 struct msghdr m = {NULL,};
1719 advance_rx_queue(sk);
1720 send_packet(NULL, new_sock, &m, 0);
1722 __skb_dequeue(&sk->sk_receive_queue);
1723 __skb_queue_head(&new_sk->sk_receive_queue, buf);
1724 skb_set_owner_r(buf, new_sk);
1726 release_sock(new_sk);
1734 * shutdown - shutdown socket connection
1735 * @sock: socket structure
1736 * @how: direction to close (must be SHUT_RDWR)
1738 * Terminates connection (if necessary), then purges socket's receive queue.
1740 * Returns 0 on success, errno otherwise
1742 static int shutdown(struct socket *sock, int how)
1744 struct sock *sk = sock->sk;
1745 struct tipc_port *tport = tipc_sk_port(sk);
1746 struct sk_buff *buf;
1749 if (how != SHUT_RDWR)
1754 switch (sock->state) {
1759 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
1760 buf = __skb_dequeue(&sk->sk_receive_queue);
1762 if (TIPC_SKB_CB(buf)->handle != NULL) {
1766 tipc_disconnect(tport->ref);
1767 tipc_reject_msg(buf, TIPC_CONN_SHUTDOWN);
1769 tipc_shutdown(tport->ref);
1772 sock->state = SS_DISCONNECTING;
1776 case SS_DISCONNECTING:
1778 /* Discard any unreceived messages */
1779 __skb_queue_purge(&sk->sk_receive_queue);
1781 /* Wake up anyone sleeping in poll */
1782 sk->sk_state_change(sk);
1795 * setsockopt - set socket option
1796 * @sock: socket structure
1797 * @lvl: option level
1798 * @opt: option identifier
1799 * @ov: pointer to new option value
1800 * @ol: length of option value
1802 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
1803 * (to ease compatibility).
1805 * Returns 0 on success, errno otherwise
1807 static int setsockopt(struct socket *sock, int lvl, int opt, char __user *ov,
1810 struct sock *sk = sock->sk;
1811 struct tipc_port *tport = tipc_sk_port(sk);
1815 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1817 if (lvl != SOL_TIPC)
1818 return -ENOPROTOOPT;
1819 if (ol < sizeof(value))
1821 res = get_user(value, (u32 __user *)ov);
1828 case TIPC_IMPORTANCE:
1829 res = tipc_set_portimportance(tport->ref, value);
1831 case TIPC_SRC_DROPPABLE:
1832 if (sock->type != SOCK_STREAM)
1833 res = tipc_set_portunreliable(tport->ref, value);
1837 case TIPC_DEST_DROPPABLE:
1838 res = tipc_set_portunreturnable(tport->ref, value);
1840 case TIPC_CONN_TIMEOUT:
1841 tipc_sk(sk)->conn_timeout = value;
1842 /* no need to set "res", since already 0 at this point */
1854 * getsockopt - get socket option
1855 * @sock: socket structure
1856 * @lvl: option level
1857 * @opt: option identifier
1858 * @ov: receptacle for option value
1859 * @ol: receptacle for length of option value
1861 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
1862 * (to ease compatibility).
1864 * Returns 0 on success, errno otherwise
1866 static int getsockopt(struct socket *sock, int lvl, int opt, char __user *ov,
1869 struct sock *sk = sock->sk;
1870 struct tipc_port *tport = tipc_sk_port(sk);
1875 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
1876 return put_user(0, ol);
1877 if (lvl != SOL_TIPC)
1878 return -ENOPROTOOPT;
1879 res = get_user(len, ol);
1886 case TIPC_IMPORTANCE:
1887 res = tipc_portimportance(tport->ref, &value);
1889 case TIPC_SRC_DROPPABLE:
1890 res = tipc_portunreliable(tport->ref, &value);
1892 case TIPC_DEST_DROPPABLE:
1893 res = tipc_portunreturnable(tport->ref, &value);
1895 case TIPC_CONN_TIMEOUT:
1896 value = tipc_sk(sk)->conn_timeout;
1897 /* no need to set "res", since already 0 at this point */
1899 case TIPC_NODE_RECVQ_DEPTH:
1900 value = 0; /* was tipc_queue_size, now obsolete */
1902 case TIPC_SOCK_RECVQ_DEPTH:
1903 value = skb_queue_len(&sk->sk_receive_queue);
1912 return res; /* "get" failed */
1914 if (len < sizeof(value))
1917 if (copy_to_user(ov, &value, sizeof(value)))
1920 return put_user(sizeof(value), ol);
1923 /* Protocol switches for the various types of TIPC sockets */
1925 static const struct proto_ops msg_ops = {
1926 .owner = THIS_MODULE,
1931 .socketpair = sock_no_socketpair,
1932 .accept = sock_no_accept,
1933 .getname = get_name,
1935 .ioctl = sock_no_ioctl,
1936 .listen = sock_no_listen,
1937 .shutdown = shutdown,
1938 .setsockopt = setsockopt,
1939 .getsockopt = getsockopt,
1940 .sendmsg = send_msg,
1941 .recvmsg = recv_msg,
1942 .mmap = sock_no_mmap,
1943 .sendpage = sock_no_sendpage
1946 static const struct proto_ops packet_ops = {
1947 .owner = THIS_MODULE,
1952 .socketpair = sock_no_socketpair,
1954 .getname = get_name,
1956 .ioctl = sock_no_ioctl,
1958 .shutdown = shutdown,
1959 .setsockopt = setsockopt,
1960 .getsockopt = getsockopt,
1961 .sendmsg = send_packet,
1962 .recvmsg = recv_msg,
1963 .mmap = sock_no_mmap,
1964 .sendpage = sock_no_sendpage
1967 static const struct proto_ops stream_ops = {
1968 .owner = THIS_MODULE,
1973 .socketpair = sock_no_socketpair,
1975 .getname = get_name,
1977 .ioctl = sock_no_ioctl,
1979 .shutdown = shutdown,
1980 .setsockopt = setsockopt,
1981 .getsockopt = getsockopt,
1982 .sendmsg = send_stream,
1983 .recvmsg = recv_stream,
1984 .mmap = sock_no_mmap,
1985 .sendpage = sock_no_sendpage
1988 static const struct net_proto_family tipc_family_ops = {
1989 .owner = THIS_MODULE,
1991 .create = tipc_sk_create
1994 static struct proto tipc_proto = {
1996 .owner = THIS_MODULE,
1997 .obj_size = sizeof(struct tipc_sock),
1998 .sysctl_rmem = sysctl_tipc_rmem
2001 static struct proto tipc_proto_kern = {
2003 .obj_size = sizeof(struct tipc_sock),
2004 .sysctl_rmem = sysctl_tipc_rmem
2008 * tipc_socket_init - initialize TIPC socket interface
2010 * Returns 0 on success, errno otherwise
2012 int tipc_socket_init(void)
2016 res = proto_register(&tipc_proto, 1);
2018 pr_err("Failed to register TIPC protocol type\n");
2022 res = sock_register(&tipc_family_ops);
2024 pr_err("Failed to register TIPC socket type\n");
2025 proto_unregister(&tipc_proto);
2033 * tipc_socket_stop - stop TIPC socket interface
2035 void tipc_socket_stop(void)
2037 sock_unregister(tipc_family_ops.family);
2038 proto_unregister(&tipc_proto);