2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2014, 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.
38 #include "name_table.h"
41 #include <linux/export.h>
45 #define SS_LISTENING -1 /* socket is listening */
46 #define SS_READY -2 /* socket is connectionless */
48 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
49 #define CONN_PROBING_INTERVAL 3600000 /* [ms] => 1 h */
50 #define TIPC_FWD_MSG 1
51 #define TIPC_CONN_OK 0
52 #define TIPC_CONN_PROBING 1
55 * struct tipc_sock - TIPC socket structure
56 * @sk: socket - interacts with 'port' and with user via the socket API
57 * @connected: non-zero if port is currently connected to a peer port
58 * @conn_type: TIPC type used when connection was established
59 * @conn_instance: TIPC instance used when connection was established
60 * @published: non-zero if port has one or more associated names
61 * @max_pkt: maximum packet size "hint" used when building messages sent by port
62 * @ref: unique reference to port in TIPC object registry
63 * @phdr: preformatted message header used when sending messages
64 * @port_list: adjacent ports in TIPC's global list of ports
65 * @publications: list of publications for port
66 * @pub_count: total # of publications port has made during its lifetime
70 * @port: port - interacts with 'sk' and with the rest of the TIPC stack
71 * @peer_name: the peer of the connection, if any
72 * @conn_timeout: the time we can wait for an unresponded setup request
73 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
74 * @link_cong: non-zero if owner must sleep because of link congestion
75 * @sent_unacked: # messages sent by socket, and not yet acked by peer
76 * @rcv_unacked: # messages read by user, but not yet acked back to peer
87 struct list_head sock_list;
88 struct list_head publications;
92 struct timer_list timer;
100 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
101 static void tipc_data_ready(struct sock *sk);
102 static void tipc_write_space(struct sock *sk);
103 static int tipc_release(struct socket *sock);
104 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
105 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
106 static void tipc_sk_timeout(unsigned long ref);
107 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
108 struct tipc_name_seq const *seq);
109 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
110 struct tipc_name_seq const *seq);
111 static u32 tipc_sk_ref_acquire(struct tipc_sock *tsk);
112 static void tipc_sk_ref_discard(u32 ref);
113 static struct tipc_sock *tipc_sk_get(u32 ref);
114 static struct tipc_sock *tipc_sk_get_next(u32 *ref);
115 static void tipc_sk_put(struct tipc_sock *tsk);
117 static const struct proto_ops packet_ops;
118 static const struct proto_ops stream_ops;
119 static const struct proto_ops msg_ops;
121 static struct proto tipc_proto;
122 static struct proto tipc_proto_kern;
125 * Revised TIPC socket locking policy:
127 * Most socket operations take the standard socket lock when they start
128 * and hold it until they finish (or until they need to sleep). Acquiring
129 * this lock grants the owner exclusive access to the fields of the socket
130 * data structures, with the exception of the backlog queue. A few socket
131 * operations can be done without taking the socket lock because they only
132 * read socket information that never changes during the life of the socket.
134 * Socket operations may acquire the lock for the associated TIPC port if they
135 * need to perform an operation on the port. If any routine needs to acquire
136 * both the socket lock and the port lock it must take the socket lock first
137 * to avoid the risk of deadlock.
139 * The dispatcher handling incoming messages cannot grab the socket lock in
140 * the standard fashion, since invoked it runs at the BH level and cannot block.
141 * Instead, it checks to see if the socket lock is currently owned by someone,
142 * and either handles the message itself or adds it to the socket's backlog
143 * queue; in the latter case the queued message is processed once the process
144 * owning the socket lock releases it.
146 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
147 * the problem of a blocked socket operation preventing any other operations
148 * from occurring. However, applications must be careful if they have
149 * multiple threads trying to send (or receive) on the same socket, as these
150 * operations might interfere with each other. For example, doing a connect
151 * and a receive at the same time might allow the receive to consume the
152 * ACK message meant for the connect. While additional work could be done
153 * to try and overcome this, it doesn't seem to be worthwhile at the present.
155 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
156 * that another operation that must be performed in a non-blocking manner is
157 * not delayed for very long because the lock has already been taken.
159 * NOTE: This code assumes that certain fields of a port/socket pair are
160 * constant over its lifetime; such fields can be examined without taking
161 * the socket lock and/or port lock, and do not need to be re-read even
162 * after resuming processing after waiting. These fields include:
164 * - pointer to socket sk structure (aka tipc_sock structure)
165 * - pointer to port structure
169 static u32 tsk_peer_node(struct tipc_sock *tsk)
171 return msg_destnode(&tsk->phdr);
174 static u32 tsk_peer_port(struct tipc_sock *tsk)
176 return msg_destport(&tsk->phdr);
179 static bool tsk_unreliable(struct tipc_sock *tsk)
181 return msg_src_droppable(&tsk->phdr) != 0;
184 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
186 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
189 static bool tsk_unreturnable(struct tipc_sock *tsk)
191 return msg_dest_droppable(&tsk->phdr) != 0;
194 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
196 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
199 static int tsk_importance(struct tipc_sock *tsk)
201 return msg_importance(&tsk->phdr);
204 static int tsk_set_importance(struct tipc_sock *tsk, int imp)
206 if (imp > TIPC_CRITICAL_IMPORTANCE)
208 msg_set_importance(&tsk->phdr, (u32)imp);
212 static struct tipc_sock *tipc_sk(const struct sock *sk)
214 return container_of(sk, struct tipc_sock, sk);
217 static int tsk_conn_cong(struct tipc_sock *tsk)
219 return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
223 * tsk_advance_rx_queue - discard first buffer in socket receive queue
225 * Caller must hold socket lock
227 static void tsk_advance_rx_queue(struct sock *sk)
229 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
233 * tsk_rej_rx_queue - reject all buffers in socket receive queue
235 * Caller must hold socket lock
237 static void tsk_rej_rx_queue(struct sock *sk)
242 while ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
243 if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))
244 tipc_link_xmit(buf, dnode, 0);
248 /* tsk_peer_msg - verify if message was sent by connected port's peer
250 * Handles cases where the node's network address has changed from
251 * the default of <0.0.0> to its configured setting.
253 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
255 u32 peer_port = tsk_peer_port(tsk);
259 if (unlikely(!tsk->connected))
262 if (unlikely(msg_origport(msg) != peer_port))
265 orig_node = msg_orignode(msg);
266 peer_node = tsk_peer_node(tsk);
268 if (likely(orig_node == peer_node))
271 if (!orig_node && (peer_node == tipc_own_addr))
274 if (!peer_node && (orig_node == tipc_own_addr))
281 * tipc_sk_create - create a TIPC socket
282 * @net: network namespace (must be default network)
283 * @sock: pre-allocated socket structure
284 * @protocol: protocol indicator (must be 0)
285 * @kern: caused by kernel or by userspace?
287 * This routine creates additional data structures used by the TIPC socket,
288 * initializes them, and links them together.
290 * Returns 0 on success, errno otherwise
292 static int tipc_sk_create(struct net *net, struct socket *sock,
293 int protocol, int kern)
295 const struct proto_ops *ops;
298 struct tipc_sock *tsk;
299 struct tipc_msg *msg;
302 /* Validate arguments */
303 if (unlikely(protocol != 0))
304 return -EPROTONOSUPPORT;
306 switch (sock->type) {
309 state = SS_UNCONNECTED;
313 state = SS_UNCONNECTED;
324 /* Allocate socket's protocol area */
326 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
328 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
334 ref = tipc_sk_ref_acquire(tsk);
336 pr_warn("Socket create failed; reference table exhausted\n");
339 tsk->max_pkt = MAX_PKT_DEFAULT;
341 INIT_LIST_HEAD(&tsk->publications);
343 tipc_msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
345 msg_set_origport(msg, ref);
347 /* Finish initializing socket data structures */
350 sock_init_data(sock, sk);
351 k_init_timer(&tsk->timer, (Handler)tipc_sk_timeout, ref);
352 sk->sk_backlog_rcv = tipc_backlog_rcv;
353 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
354 sk->sk_data_ready = tipc_data_ready;
355 sk->sk_write_space = tipc_write_space;
356 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
357 tsk->sent_unacked = 0;
358 atomic_set(&tsk->dupl_rcvcnt, 0);
360 if (sock->state == SS_READY) {
361 tsk_set_unreturnable(tsk, true);
362 if (sock->type == SOCK_DGRAM)
363 tsk_set_unreliable(tsk, true);
369 * tipc_sock_create_local - create TIPC socket from inside TIPC module
370 * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
372 * We cannot use sock_creat_kern here because it bumps module user count.
373 * Since socket owner and creator is the same module we must make sure
374 * that module count remains zero for module local sockets, otherwise
375 * we cannot do rmmod.
377 * Returns 0 on success, errno otherwise
379 int tipc_sock_create_local(int type, struct socket **res)
383 rc = sock_create_lite(AF_TIPC, type, 0, res);
385 pr_err("Failed to create kernel socket\n");
388 tipc_sk_create(&init_net, *res, 0, 1);
394 * tipc_sock_release_local - release socket created by tipc_sock_create_local
395 * @sock: the socket to be released.
397 * Module reference count is not incremented when such sockets are created,
398 * so we must keep it from being decremented when they are released.
400 void tipc_sock_release_local(struct socket *sock)
408 * tipc_sock_accept_local - accept a connection on a socket created
409 * with tipc_sock_create_local. Use this function to avoid that
410 * module reference count is inadvertently incremented.
412 * @sock: the accepting socket
413 * @newsock: reference to the new socket to be created
414 * @flags: socket flags
417 int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
420 struct sock *sk = sock->sk;
423 ret = sock_create_lite(sk->sk_family, sk->sk_type,
424 sk->sk_protocol, newsock);
428 ret = tipc_accept(sock, *newsock, flags);
430 sock_release(*newsock);
433 (*newsock)->ops = sock->ops;
438 * tipc_release - destroy a TIPC socket
439 * @sock: socket to destroy
441 * This routine cleans up any messages that are still queued on the socket.
442 * For DGRAM and RDM socket types, all queued messages are rejected.
443 * For SEQPACKET and STREAM socket types, the first message is rejected
444 * and any others are discarded. (If the first message on a STREAM socket
445 * is partially-read, it is discarded and the next one is rejected instead.)
447 * NOTE: Rejected messages are not necessarily returned to the sender! They
448 * are returned or discarded according to the "destination droppable" setting
449 * specified for the message by the sender.
451 * Returns 0 on success, errno otherwise
453 static int tipc_release(struct socket *sock)
455 struct sock *sk = sock->sk;
456 struct tipc_sock *tsk;
461 * Exit if socket isn't fully initialized (occurs when a failed accept()
462 * releases a pre-allocated child socket that was never used)
471 * Reject all unreceived messages, except on an active connection
472 * (which disconnects locally & sends a 'FIN+' to peer)
474 dnode = tsk_peer_node(tsk);
475 while (sock->state != SS_DISCONNECTING) {
476 buf = __skb_dequeue(&sk->sk_receive_queue);
479 if (TIPC_SKB_CB(buf)->handle != NULL)
482 if ((sock->state == SS_CONNECTING) ||
483 (sock->state == SS_CONNECTED)) {
484 sock->state = SS_DISCONNECTING;
486 tipc_node_remove_conn(dnode, tsk->ref);
488 if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))
489 tipc_link_xmit(buf, dnode, 0);
493 tipc_sk_withdraw(tsk, 0, NULL);
494 tipc_sk_ref_discard(tsk->ref);
495 k_cancel_timer(&tsk->timer);
496 if (tsk->connected) {
497 buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
498 SHORT_H_SIZE, 0, dnode, tipc_own_addr,
500 tsk->ref, TIPC_ERR_NO_PORT);
502 tipc_link_xmit(buf, dnode, tsk->ref);
503 tipc_node_remove_conn(dnode, tsk->ref);
505 k_term_timer(&tsk->timer);
507 /* Discard any remaining (connection-based) messages in receive queue */
508 __skb_queue_purge(&sk->sk_receive_queue);
510 /* Reject any messages that accumulated in backlog queue */
511 sock->state = SS_DISCONNECTING;
520 * tipc_bind - associate or disassocate TIPC name(s) with a socket
521 * @sock: socket structure
522 * @uaddr: socket address describing name(s) and desired operation
523 * @uaddr_len: size of socket address data structure
525 * Name and name sequence binding is indicated using a positive scope value;
526 * a negative scope value unbinds the specified name. Specifying no name
527 * (i.e. a socket address length of 0) unbinds all names from the socket.
529 * Returns 0 on success, errno otherwise
531 * NOTE: This routine doesn't need to take the socket lock since it doesn't
532 * access any non-constant socket information.
534 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
537 struct sock *sk = sock->sk;
538 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
539 struct tipc_sock *tsk = tipc_sk(sk);
543 if (unlikely(!uaddr_len)) {
544 res = tipc_sk_withdraw(tsk, 0, NULL);
548 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
552 if (addr->family != AF_TIPC) {
557 if (addr->addrtype == TIPC_ADDR_NAME)
558 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
559 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
564 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
565 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
566 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
571 res = (addr->scope > 0) ?
572 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
573 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
580 * tipc_getname - get port ID of socket or peer socket
581 * @sock: socket structure
582 * @uaddr: area for returned socket address
583 * @uaddr_len: area for returned length of socket address
584 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
586 * Returns 0 on success, errno otherwise
588 * NOTE: This routine doesn't need to take the socket lock since it only
589 * accesses socket information that is unchanging (or which changes in
590 * a completely predictable manner).
592 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
593 int *uaddr_len, int peer)
595 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
596 struct tipc_sock *tsk = tipc_sk(sock->sk);
598 memset(addr, 0, sizeof(*addr));
600 if ((sock->state != SS_CONNECTED) &&
601 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
603 addr->addr.id.ref = tsk_peer_port(tsk);
604 addr->addr.id.node = tsk_peer_node(tsk);
606 addr->addr.id.ref = tsk->ref;
607 addr->addr.id.node = tipc_own_addr;
610 *uaddr_len = sizeof(*addr);
611 addr->addrtype = TIPC_ADDR_ID;
612 addr->family = AF_TIPC;
614 addr->addr.name.domain = 0;
620 * tipc_poll - read and possibly block on pollmask
621 * @file: file structure associated with the socket
622 * @sock: socket for which to calculate the poll bits
625 * Returns pollmask value
628 * It appears that the usual socket locking mechanisms are not useful here
629 * since the pollmask info is potentially out-of-date the moment this routine
630 * exits. TCP and other protocols seem to rely on higher level poll routines
631 * to handle any preventable race conditions, so TIPC will do the same ...
633 * TIPC sets the returned events as follows:
635 * socket state flags set
636 * ------------ ---------
637 * unconnected no read flags
638 * POLLOUT if port is not congested
640 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
643 * connected POLLIN/POLLRDNORM if data in rx queue
644 * POLLOUT if port is not congested
646 * disconnecting POLLIN/POLLRDNORM/POLLHUP
649 * listening POLLIN if SYN in rx queue
652 * ready POLLIN/POLLRDNORM if data in rx queue
653 * [connectionless] POLLOUT (since port cannot be congested)
655 * IMPORTANT: The fact that a read or write operation is indicated does NOT
656 * imply that the operation will succeed, merely that it should be performed
657 * and will not block.
659 static unsigned int tipc_poll(struct file *file, struct socket *sock,
662 struct sock *sk = sock->sk;
663 struct tipc_sock *tsk = tipc_sk(sk);
666 sock_poll_wait(file, sk_sleep(sk), wait);
668 switch ((int)sock->state) {
675 if (!tsk->link_cong && !tsk_conn_cong(tsk))
680 if (!skb_queue_empty(&sk->sk_receive_queue))
681 mask |= (POLLIN | POLLRDNORM);
683 case SS_DISCONNECTING:
684 mask = (POLLIN | POLLRDNORM | POLLHUP);
692 * tipc_sendmcast - send multicast message
693 * @sock: socket structure
694 * @seq: destination address
695 * @iov: message data to send
696 * @dsz: total length of message data
697 * @timeo: timeout to wait for wakeup
699 * Called from function tipc_sendmsg(), which has done all sanity checks
700 * Returns the number of bytes sent on success, or errno
702 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
703 struct iovec *iov, size_t dsz, long timeo)
705 struct sock *sk = sock->sk;
706 struct tipc_msg *mhdr = &tipc_sk(sk)->phdr;
711 msg_set_type(mhdr, TIPC_MCAST_MSG);
712 msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
713 msg_set_destport(mhdr, 0);
714 msg_set_destnode(mhdr, 0);
715 msg_set_nametype(mhdr, seq->type);
716 msg_set_namelower(mhdr, seq->lower);
717 msg_set_nameupper(mhdr, seq->upper);
718 msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
721 mtu = tipc_bclink_get_mtu();
722 rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf);
723 if (unlikely(rc < 0))
727 rc = tipc_bclink_xmit(buf);
728 if (likely(rc >= 0)) {
734 if (rc != -ELINKCONG)
736 tipc_sk(sk)->link_cong = 1;
737 rc = tipc_wait_for_sndmsg(sock, &timeo);
744 /* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets
746 void tipc_sk_mcast_rcv(struct sk_buff *buf)
748 struct tipc_msg *msg = buf_msg(buf);
749 struct tipc_port_list dports = {0, NULL, };
750 struct tipc_port_list *item;
752 uint i, last, dst = 0;
753 u32 scope = TIPC_CLUSTER_SCOPE;
755 if (in_own_node(msg_orignode(msg)))
756 scope = TIPC_NODE_SCOPE;
758 /* Create destination port list: */
759 tipc_nametbl_mc_translate(msg_nametype(msg),
770 for (item = &dports; item; item = item->next) {
771 for (i = 0; i < PLSIZE && ++dst <= last; i++) {
772 b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf;
774 pr_warn("Failed do clone mcast rcv buffer\n");
777 msg_set_destport(msg, item->ports[i]);
781 tipc_port_list_free(&dports);
785 * tipc_sk_proto_rcv - receive a connection mng protocol message
786 * @tsk: receiving socket
787 * @dnode: node to send response message to, if any
788 * @buf: buffer containing protocol message
789 * Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if
790 * (CONN_PROBE_REPLY) message should be forwarded.
792 static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode,
795 struct tipc_msg *msg = buf_msg(buf);
798 /* Ignore if connection cannot be validated: */
799 if (!tsk_peer_msg(tsk, msg))
802 tsk->probing_state = TIPC_CONN_OK;
804 if (msg_type(msg) == CONN_ACK) {
805 conn_cong = tsk_conn_cong(tsk);
806 tsk->sent_unacked -= msg_msgcnt(msg);
808 tsk->sk.sk_write_space(&tsk->sk);
809 } else if (msg_type(msg) == CONN_PROBE) {
810 if (!tipc_msg_reverse(buf, dnode, TIPC_OK))
812 msg_set_type(msg, CONN_PROBE_REPLY);
815 /* Do nothing if msg_type() == CONN_PROBE_REPLY */
822 * dest_name_check - verify user is permitted to send to specified port name
823 * @dest: destination address
824 * @m: descriptor for message to be sent
826 * Prevents restricted configuration commands from being issued by
827 * unauthorized users.
829 * Returns 0 if permission is granted, otherwise errno
831 static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
833 struct tipc_cfg_msg_hdr hdr;
835 if (unlikely(dest->addrtype == TIPC_ADDR_ID))
837 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
839 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
841 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
844 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
846 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
848 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
854 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
856 struct sock *sk = sock->sk;
857 struct tipc_sock *tsk = tipc_sk(sk);
862 int err = sock_error(sk);
865 if (sock->state == SS_DISCONNECTING)
869 if (signal_pending(current))
870 return sock_intr_errno(*timeo_p);
872 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
873 done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
874 finish_wait(sk_sleep(sk), &wait);
880 * tipc_sendmsg - send message in connectionless manner
881 * @iocb: if NULL, indicates that socket lock is already held
882 * @sock: socket structure
883 * @m: message to send
884 * @dsz: amount of user data to be sent
886 * Message must have an destination specified explicitly.
887 * Used for SOCK_RDM and SOCK_DGRAM messages,
888 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
889 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
891 * Returns the number of bytes sent on success, or errno otherwise
893 static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
894 struct msghdr *m, size_t dsz)
896 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
897 struct sock *sk = sock->sk;
898 struct tipc_sock *tsk = tipc_sk(sk);
899 struct tipc_msg *mhdr = &tsk->phdr;
900 struct iovec *iov = m->msg_iov;
903 struct tipc_name_seq *seq = &dest->addr.nameseq;
909 return -EDESTADDRREQ;
911 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
912 (dest->family != AF_TIPC)))
915 if (dsz > TIPC_MAX_USER_MSG_SIZE)
921 if (unlikely(sock->state != SS_READY)) {
922 if (sock->state == SS_LISTENING) {
926 if (sock->state != SS_UNCONNECTED) {
930 if (tsk->published) {
934 if (dest->addrtype == TIPC_ADDR_NAME) {
935 tsk->conn_type = dest->addr.name.name.type;
936 tsk->conn_instance = dest->addr.name.name.instance;
939 rc = dest_name_check(dest, m);
943 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
945 if (dest->addrtype == TIPC_ADDR_MCAST) {
946 rc = tipc_sendmcast(sock, seq, iov, dsz, timeo);
948 } else if (dest->addrtype == TIPC_ADDR_NAME) {
949 u32 type = dest->addr.name.name.type;
950 u32 inst = dest->addr.name.name.instance;
951 u32 domain = dest->addr.name.domain;
954 msg_set_type(mhdr, TIPC_NAMED_MSG);
955 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
956 msg_set_nametype(mhdr, type);
957 msg_set_nameinst(mhdr, inst);
958 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
959 dport = tipc_nametbl_translate(type, inst, &dnode);
960 msg_set_destnode(mhdr, dnode);
961 msg_set_destport(mhdr, dport);
962 if (unlikely(!dport && !dnode)) {
966 } else if (dest->addrtype == TIPC_ADDR_ID) {
967 dnode = dest->addr.id.node;
968 msg_set_type(mhdr, TIPC_DIRECT_MSG);
969 msg_set_lookup_scope(mhdr, 0);
970 msg_set_destnode(mhdr, dnode);
971 msg_set_destport(mhdr, dest->addr.id.ref);
972 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
976 mtu = tipc_node_get_mtu(dnode, tsk->ref);
977 rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf);
982 TIPC_SKB_CB(buf)->wakeup_pending = tsk->link_cong;
983 rc = tipc_link_xmit(buf, dnode, tsk->ref);
984 if (likely(rc >= 0)) {
985 if (sock->state != SS_READY)
986 sock->state = SS_CONNECTING;
992 if (rc != -ELINKCONG)
995 rc = tipc_wait_for_sndmsg(sock, &timeo);
1006 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
1008 struct sock *sk = sock->sk;
1009 struct tipc_sock *tsk = tipc_sk(sk);
1014 int err = sock_error(sk);
1017 if (sock->state == SS_DISCONNECTING)
1019 else if (sock->state != SS_CONNECTED)
1023 if (signal_pending(current))
1024 return sock_intr_errno(*timeo_p);
1026 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1027 done = sk_wait_event(sk, timeo_p,
1029 !tsk_conn_cong(tsk)) ||
1031 finish_wait(sk_sleep(sk), &wait);
1037 * tipc_send_stream - send stream-oriented data
1039 * @sock: socket structure
1041 * @dsz: total length of data to be transmitted
1043 * Used for SOCK_STREAM data.
1045 * Returns the number of bytes sent on success (or partial success),
1046 * or errno if no data sent
1048 static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
1049 struct msghdr *m, size_t dsz)
1051 struct sock *sk = sock->sk;
1052 struct tipc_sock *tsk = tipc_sk(sk);
1053 struct tipc_msg *mhdr = &tsk->phdr;
1054 struct sk_buff *buf;
1055 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1060 uint mtu, send, sent = 0;
1062 /* Handle implied connection establishment */
1063 if (unlikely(dest)) {
1064 rc = tipc_sendmsg(iocb, sock, m, dsz);
1065 if (dsz && (dsz == rc))
1066 tsk->sent_unacked = 1;
1069 if (dsz > (uint)INT_MAX)
1075 if (unlikely(sock->state != SS_CONNECTED)) {
1076 if (sock->state == SS_DISCONNECTING)
1083 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1084 dnode = tsk_peer_node(tsk);
1088 send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
1089 rc = tipc_msg_build(mhdr, m->msg_iov, sent, send, mtu, &buf);
1090 if (unlikely(rc < 0))
1093 if (likely(!tsk_conn_cong(tsk))) {
1094 rc = tipc_link_xmit(buf, dnode, ref);
1096 tsk->sent_unacked++;
1102 if (rc == -EMSGSIZE) {
1103 tsk->max_pkt = tipc_node_get_mtu(dnode, ref);
1106 if (rc != -ELINKCONG)
1110 rc = tipc_wait_for_sndpkt(sock, &timeo);
1112 kfree_skb_list(buf);
1117 return sent ? sent : rc;
1121 * tipc_send_packet - send a connection-oriented message
1122 * @iocb: if NULL, indicates that socket lock is already held
1123 * @sock: socket structure
1124 * @m: message to send
1125 * @dsz: length of data to be transmitted
1127 * Used for SOCK_SEQPACKET messages.
1129 * Returns the number of bytes sent on success, or errno otherwise
1131 static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
1132 struct msghdr *m, size_t dsz)
1134 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1137 return tipc_send_stream(iocb, sock, m, dsz);
1140 /* tipc_sk_finish_conn - complete the setup of a connection
1142 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1145 struct tipc_msg *msg = &tsk->phdr;
1147 msg_set_destnode(msg, peer_node);
1148 msg_set_destport(msg, peer_port);
1149 msg_set_type(msg, TIPC_CONN_MSG);
1150 msg_set_lookup_scope(msg, 0);
1151 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1153 tsk->probing_interval = CONN_PROBING_INTERVAL;
1154 tsk->probing_state = TIPC_CONN_OK;
1156 k_start_timer(&tsk->timer, tsk->probing_interval);
1157 tipc_node_add_conn(peer_node, tsk->ref, peer_port);
1158 tsk->max_pkt = tipc_node_get_mtu(peer_node, tsk->ref);
1162 * set_orig_addr - capture sender's address for received message
1163 * @m: descriptor for message info
1164 * @msg: received message header
1166 * Note: Address is not captured if not requested by receiver.
1168 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
1170 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
1173 addr->family = AF_TIPC;
1174 addr->addrtype = TIPC_ADDR_ID;
1175 memset(&addr->addr, 0, sizeof(addr->addr));
1176 addr->addr.id.ref = msg_origport(msg);
1177 addr->addr.id.node = msg_orignode(msg);
1178 addr->addr.name.domain = 0; /* could leave uninitialized */
1179 addr->scope = 0; /* could leave uninitialized */
1180 m->msg_namelen = sizeof(struct sockaddr_tipc);
1185 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1186 * @m: descriptor for message info
1187 * @msg: received message header
1188 * @tsk: TIPC port associated with message
1190 * Note: Ancillary data is not captured if not requested by receiver.
1192 * Returns 0 if successful, otherwise errno
1194 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1195 struct tipc_sock *tsk)
1203 if (likely(m->msg_controllen == 0))
1206 /* Optionally capture errored message object(s) */
1207 err = msg ? msg_errcode(msg) : 0;
1208 if (unlikely(err)) {
1210 anc_data[1] = msg_data_sz(msg);
1211 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1215 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1222 /* Optionally capture message destination object */
1223 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1224 switch (dest_type) {
1225 case TIPC_NAMED_MSG:
1227 anc_data[0] = msg_nametype(msg);
1228 anc_data[1] = msg_namelower(msg);
1229 anc_data[2] = msg_namelower(msg);
1231 case TIPC_MCAST_MSG:
1233 anc_data[0] = msg_nametype(msg);
1234 anc_data[1] = msg_namelower(msg);
1235 anc_data[2] = msg_nameupper(msg);
1238 has_name = (tsk->conn_type != 0);
1239 anc_data[0] = tsk->conn_type;
1240 anc_data[1] = tsk->conn_instance;
1241 anc_data[2] = tsk->conn_instance;
1247 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1255 static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
1257 struct sk_buff *buf = NULL;
1258 struct tipc_msg *msg;
1259 u32 peer_port = tsk_peer_port(tsk);
1260 u32 dnode = tsk_peer_node(tsk);
1262 if (!tsk->connected)
1264 buf = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode,
1265 tipc_own_addr, peer_port, tsk->ref, TIPC_OK);
1269 msg_set_msgcnt(msg, ack);
1270 tipc_link_xmit(buf, dnode, msg_link_selector(msg));
1273 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1275 struct sock *sk = sock->sk;
1277 long timeo = *timeop;
1281 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1282 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1283 if (sock->state == SS_DISCONNECTING) {
1288 timeo = schedule_timeout(timeo);
1292 if (!skb_queue_empty(&sk->sk_receive_queue))
1294 err = sock_intr_errno(timeo);
1295 if (signal_pending(current))
1301 finish_wait(sk_sleep(sk), &wait);
1307 * tipc_recvmsg - receive packet-oriented message
1309 * @m: descriptor for message info
1310 * @buf_len: total size of user buffer area
1311 * @flags: receive flags
1313 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1314 * If the complete message doesn't fit in user area, truncate it.
1316 * Returns size of returned message data, errno otherwise
1318 static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
1319 struct msghdr *m, size_t buf_len, int flags)
1321 struct sock *sk = sock->sk;
1322 struct tipc_sock *tsk = tipc_sk(sk);
1323 struct sk_buff *buf;
1324 struct tipc_msg *msg;
1330 /* Catch invalid receive requests */
1331 if (unlikely(!buf_len))
1336 if (unlikely(sock->state == SS_UNCONNECTED)) {
1341 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1344 /* Look for a message in receive queue; wait if necessary */
1345 res = tipc_wait_for_rcvmsg(sock, &timeo);
1349 /* Look at first message in receive queue */
1350 buf = skb_peek(&sk->sk_receive_queue);
1352 sz = msg_data_sz(msg);
1353 err = msg_errcode(msg);
1355 /* Discard an empty non-errored message & try again */
1356 if ((!sz) && (!err)) {
1357 tsk_advance_rx_queue(sk);
1361 /* Capture sender's address (optional) */
1362 set_orig_addr(m, msg);
1364 /* Capture ancillary data (optional) */
1365 res = tipc_sk_anc_data_recv(m, msg, tsk);
1369 /* Capture message data (if valid) & compute return value (always) */
1371 if (unlikely(buf_len < sz)) {
1373 m->msg_flags |= MSG_TRUNC;
1375 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg),
1381 if ((sock->state == SS_READY) ||
1382 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1388 /* Consume received message (optional) */
1389 if (likely(!(flags & MSG_PEEK))) {
1390 if ((sock->state != SS_READY) &&
1391 (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1392 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1393 tsk->rcv_unacked = 0;
1395 tsk_advance_rx_queue(sk);
1403 * tipc_recv_stream - receive stream-oriented data
1405 * @m: descriptor for message info
1406 * @buf_len: total size of user buffer area
1407 * @flags: receive flags
1409 * Used for SOCK_STREAM messages only. If not enough data is available
1410 * will optionally wait for more; never truncates data.
1412 * Returns size of returned message data, errno otherwise
1414 static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
1415 struct msghdr *m, size_t buf_len, int flags)
1417 struct sock *sk = sock->sk;
1418 struct tipc_sock *tsk = tipc_sk(sk);
1419 struct sk_buff *buf;
1420 struct tipc_msg *msg;
1423 int sz_to_copy, target, needed;
1428 /* Catch invalid receive attempts */
1429 if (unlikely(!buf_len))
1434 if (unlikely(sock->state == SS_UNCONNECTED)) {
1439 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1440 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1443 /* Look for a message in receive queue; wait if necessary */
1444 res = tipc_wait_for_rcvmsg(sock, &timeo);
1448 /* Look at first message in receive queue */
1449 buf = skb_peek(&sk->sk_receive_queue);
1451 sz = msg_data_sz(msg);
1452 err = msg_errcode(msg);
1454 /* Discard an empty non-errored message & try again */
1455 if ((!sz) && (!err)) {
1456 tsk_advance_rx_queue(sk);
1460 /* Optionally capture sender's address & ancillary data of first msg */
1461 if (sz_copied == 0) {
1462 set_orig_addr(m, msg);
1463 res = tipc_sk_anc_data_recv(m, msg, tsk);
1468 /* Capture message data (if valid) & compute return value (always) */
1470 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1473 needed = (buf_len - sz_copied);
1474 sz_to_copy = (sz <= needed) ? sz : needed;
1476 res = skb_copy_datagram_iovec(buf, msg_hdr_sz(msg) + offset,
1477 m->msg_iov, sz_to_copy);
1481 sz_copied += sz_to_copy;
1483 if (sz_to_copy < sz) {
1484 if (!(flags & MSG_PEEK))
1485 TIPC_SKB_CB(buf)->handle =
1486 (void *)(unsigned long)(offset + sz_to_copy);
1491 goto exit; /* can't add error msg to valid data */
1493 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1499 /* Consume received message (optional) */
1500 if (likely(!(flags & MSG_PEEK))) {
1501 if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1502 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1503 tsk->rcv_unacked = 0;
1505 tsk_advance_rx_queue(sk);
1508 /* Loop around if more data is required */
1509 if ((sz_copied < buf_len) && /* didn't get all requested data */
1510 (!skb_queue_empty(&sk->sk_receive_queue) ||
1511 (sz_copied < target)) && /* and more is ready or required */
1512 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1513 (!err)) /* and haven't reached a FIN */
1518 return sz_copied ? sz_copied : res;
1522 * tipc_write_space - wake up thread if port congestion is released
1525 static void tipc_write_space(struct sock *sk)
1527 struct socket_wq *wq;
1530 wq = rcu_dereference(sk->sk_wq);
1531 if (wq_has_sleeper(wq))
1532 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1533 POLLWRNORM | POLLWRBAND);
1538 * tipc_data_ready - wake up threads to indicate messages have been received
1540 * @len: the length of messages
1542 static void tipc_data_ready(struct sock *sk)
1544 struct socket_wq *wq;
1547 wq = rcu_dereference(sk->sk_wq);
1548 if (wq_has_sleeper(wq))
1549 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1550 POLLRDNORM | POLLRDBAND);
1555 * filter_connect - Handle all incoming messages for a connection-based socket
1559 * Returns 0 (TIPC_OK) if everyting ok, -TIPC_ERR_NO_PORT otherwise
1561 static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
1563 struct sock *sk = &tsk->sk;
1564 struct socket *sock = sk->sk_socket;
1565 struct tipc_msg *msg = buf_msg(*buf);
1566 int retval = -TIPC_ERR_NO_PORT;
1571 switch ((int)sock->state) {
1573 /* Accept only connection-based messages sent by peer */
1574 if (tsk_peer_msg(tsk, msg)) {
1575 if (unlikely(msg_errcode(msg))) {
1576 sock->state = SS_DISCONNECTING;
1578 /* let timer expire on it's own */
1579 tipc_node_remove_conn(tsk_peer_node(tsk),
1586 /* Accept only ACK or NACK message */
1588 if (unlikely(!msg_connected(msg)))
1591 if (unlikely(msg_errcode(msg))) {
1592 sock->state = SS_DISCONNECTING;
1593 sk->sk_err = ECONNREFUSED;
1598 if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
1599 sock->state = SS_DISCONNECTING;
1600 sk->sk_err = EINVAL;
1605 tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg));
1606 msg_set_importance(&tsk->phdr, msg_importance(msg));
1607 sock->state = SS_CONNECTED;
1609 /* If an incoming message is an 'ACK-', it should be
1610 * discarded here because it doesn't contain useful
1611 * data. In addition, we should try to wake up
1612 * connect() routine if sleeping.
1614 if (msg_data_sz(msg) == 0) {
1617 if (waitqueue_active(sk_sleep(sk)))
1618 wake_up_interruptible(sk_sleep(sk));
1623 case SS_UNCONNECTED:
1624 /* Accept only SYN message */
1625 if (!msg_connected(msg) && !(msg_errcode(msg)))
1628 case SS_DISCONNECTING:
1631 pr_err("Unknown socket state %u\n", sock->state);
1637 * rcvbuf_limit - get proper overload limit of socket receive queue
1641 * For all connection oriented messages, irrespective of importance,
1642 * the default overload value (i.e. 67MB) is set as limit.
1644 * For all connectionless messages, by default new queue limits are
1647 * TIPC_LOW_IMPORTANCE (4 MB)
1648 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1649 * TIPC_HIGH_IMPORTANCE (16 MB)
1650 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1652 * Returns overload limit according to corresponding message importance
1654 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1656 struct tipc_msg *msg = buf_msg(buf);
1658 if (msg_connected(msg))
1659 return sysctl_tipc_rmem[2];
1661 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1662 msg_importance(msg);
1666 * filter_rcv - validate incoming message
1670 * Enqueues message on receive queue if acceptable; optionally handles
1671 * disconnect indication for a connected socket.
1673 * Called with socket lock already taken; port lock may also be taken.
1675 * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message
1676 * to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded
1678 static int filter_rcv(struct sock *sk, struct sk_buff *buf)
1680 struct socket *sock = sk->sk_socket;
1681 struct tipc_sock *tsk = tipc_sk(sk);
1682 struct tipc_msg *msg = buf_msg(buf);
1683 unsigned int limit = rcvbuf_limit(sk, buf);
1687 if (unlikely(msg_user(msg) == CONN_MANAGER))
1688 return tipc_sk_proto_rcv(tsk, &onode, buf);
1690 if (unlikely(msg_user(msg) == SOCK_WAKEUP)) {
1693 sk->sk_write_space(sk);
1697 /* Reject message if it is wrong sort of message for socket */
1698 if (msg_type(msg) > TIPC_DIRECT_MSG)
1699 return -TIPC_ERR_NO_PORT;
1701 if (sock->state == SS_READY) {
1702 if (msg_connected(msg))
1703 return -TIPC_ERR_NO_PORT;
1705 rc = filter_connect(tsk, &buf);
1706 if (rc != TIPC_OK || buf == NULL)
1710 /* Reject message if there isn't room to queue it */
1711 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1712 return -TIPC_ERR_OVERLOAD;
1714 /* Enqueue message */
1715 TIPC_SKB_CB(buf)->handle = NULL;
1716 __skb_queue_tail(&sk->sk_receive_queue, buf);
1717 skb_set_owner_r(buf, sk);
1719 sk->sk_data_ready(sk);
1724 * tipc_backlog_rcv - handle incoming message from backlog queue
1728 * Caller must hold socket lock, but not port lock.
1732 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf)
1736 struct tipc_sock *tsk = tipc_sk(sk);
1737 uint truesize = buf->truesize;
1739 rc = filter_rcv(sk, buf);
1742 if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT)
1743 atomic_add(truesize, &tsk->dupl_rcvcnt);
1747 if ((rc < 0) && !tipc_msg_reverse(buf, &onode, -rc))
1750 tipc_link_xmit(buf, onode, 0);
1756 * tipc_sk_rcv - handle incoming message
1757 * @buf: buffer containing arriving message
1759 * Returns 0 if success, or errno: -EHOSTUNREACH
1761 int tipc_sk_rcv(struct sk_buff *buf)
1763 struct tipc_sock *tsk;
1765 u32 dport = msg_destport(buf_msg(buf));
1770 /* Validate destination and message */
1771 tsk = tipc_sk_get(dport);
1772 if (unlikely(!tsk)) {
1773 rc = tipc_msg_eval(buf, &dnode);
1779 spin_lock_bh(&sk->sk_lock.slock);
1781 if (!sock_owned_by_user(sk)) {
1782 rc = filter_rcv(sk, buf);
1784 if (sk->sk_backlog.len == 0)
1785 atomic_set(&tsk->dupl_rcvcnt, 0);
1786 limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt);
1787 if (sk_add_backlog(sk, buf, limit))
1788 rc = -TIPC_ERR_OVERLOAD;
1790 spin_unlock_bh(&sk->sk_lock.slock);
1795 if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc))
1796 return -EHOSTUNREACH;
1798 tipc_link_xmit(buf, dnode, 0);
1799 return (rc < 0) ? -EHOSTUNREACH : 0;
1802 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1804 struct sock *sk = sock->sk;
1809 int err = sock_error(sk);
1814 if (signal_pending(current))
1815 return sock_intr_errno(*timeo_p);
1817 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1818 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1819 finish_wait(sk_sleep(sk), &wait);
1825 * tipc_connect - establish a connection to another TIPC port
1826 * @sock: socket structure
1827 * @dest: socket address for destination port
1828 * @destlen: size of socket address data structure
1829 * @flags: file-related flags associated with socket
1831 * Returns 0 on success, errno otherwise
1833 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1834 int destlen, int flags)
1836 struct sock *sk = sock->sk;
1837 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1838 struct msghdr m = {NULL,};
1839 long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1840 socket_state previous;
1845 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1846 if (sock->state == SS_READY) {
1852 * Reject connection attempt using multicast address
1854 * Note: send_msg() validates the rest of the address fields,
1855 * so there's no need to do it here
1857 if (dst->addrtype == TIPC_ADDR_MCAST) {
1862 previous = sock->state;
1863 switch (sock->state) {
1864 case SS_UNCONNECTED:
1865 /* Send a 'SYN-' to destination */
1867 m.msg_namelen = destlen;
1869 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1870 * indicate send_msg() is never blocked.
1873 m.msg_flags = MSG_DONTWAIT;
1875 res = tipc_sendmsg(NULL, sock, &m, 0);
1876 if ((res < 0) && (res != -EWOULDBLOCK))
1879 /* Just entered SS_CONNECTING state; the only
1880 * difference is that return value in non-blocking
1881 * case is EINPROGRESS, rather than EALREADY.
1885 if (previous == SS_CONNECTING)
1889 timeout = msecs_to_jiffies(timeout);
1890 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1891 res = tipc_wait_for_connect(sock, &timeout);
1906 * tipc_listen - allow socket to listen for incoming connections
1907 * @sock: socket structure
1910 * Returns 0 on success, errno otherwise
1912 static int tipc_listen(struct socket *sock, int len)
1914 struct sock *sk = sock->sk;
1919 if (sock->state != SS_UNCONNECTED)
1922 sock->state = SS_LISTENING;
1930 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1932 struct sock *sk = sock->sk;
1936 /* True wake-one mechanism for incoming connections: only
1937 * one process gets woken up, not the 'whole herd'.
1938 * Since we do not 'race & poll' for established sockets
1939 * anymore, the common case will execute the loop only once.
1942 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1943 TASK_INTERRUPTIBLE);
1944 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1946 timeo = schedule_timeout(timeo);
1950 if (!skb_queue_empty(&sk->sk_receive_queue))
1953 if (sock->state != SS_LISTENING)
1955 err = sock_intr_errno(timeo);
1956 if (signal_pending(current))
1962 finish_wait(sk_sleep(sk), &wait);
1967 * tipc_accept - wait for connection request
1968 * @sock: listening socket
1969 * @newsock: new socket that is to be connected
1970 * @flags: file-related flags associated with socket
1972 * Returns 0 on success, errno otherwise
1974 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1976 struct sock *new_sk, *sk = sock->sk;
1977 struct sk_buff *buf;
1978 struct tipc_sock *new_tsock;
1979 struct tipc_msg *msg;
1985 if (sock->state != SS_LISTENING) {
1989 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1990 res = tipc_wait_for_accept(sock, timeo);
1994 buf = skb_peek(&sk->sk_receive_queue);
1996 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
2000 new_sk = new_sock->sk;
2001 new_tsock = tipc_sk(new_sk);
2004 /* we lock on new_sk; but lockdep sees the lock on sk */
2005 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2008 * Reject any stray messages received by new socket
2009 * before the socket lock was taken (very, very unlikely)
2011 tsk_rej_rx_queue(new_sk);
2013 /* Connect new socket to it's peer */
2014 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2015 new_sock->state = SS_CONNECTED;
2017 tsk_set_importance(new_tsock, msg_importance(msg));
2018 if (msg_named(msg)) {
2019 new_tsock->conn_type = msg_nametype(msg);
2020 new_tsock->conn_instance = msg_nameinst(msg);
2024 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2025 * Respond to 'SYN+' by queuing it on new socket.
2027 if (!msg_data_sz(msg)) {
2028 struct msghdr m = {NULL,};
2030 tsk_advance_rx_queue(sk);
2031 tipc_send_packet(NULL, new_sock, &m, 0);
2033 __skb_dequeue(&sk->sk_receive_queue);
2034 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2035 skb_set_owner_r(buf, new_sk);
2037 release_sock(new_sk);
2044 * tipc_shutdown - shutdown socket connection
2045 * @sock: socket structure
2046 * @how: direction to close (must be SHUT_RDWR)
2048 * Terminates connection (if necessary), then purges socket's receive queue.
2050 * Returns 0 on success, errno otherwise
2052 static int tipc_shutdown(struct socket *sock, int how)
2054 struct sock *sk = sock->sk;
2055 struct tipc_sock *tsk = tipc_sk(sk);
2056 struct sk_buff *buf;
2060 if (how != SHUT_RDWR)
2065 switch (sock->state) {
2070 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
2071 buf = __skb_dequeue(&sk->sk_receive_queue);
2073 if (TIPC_SKB_CB(buf)->handle != NULL) {
2077 if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN))
2078 tipc_link_xmit(buf, dnode, tsk->ref);
2079 tipc_node_remove_conn(dnode, tsk->ref);
2081 dnode = tsk_peer_node(tsk);
2082 buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2083 TIPC_CONN_MSG, SHORT_H_SIZE,
2084 0, dnode, tipc_own_addr,
2086 tsk->ref, TIPC_CONN_SHUTDOWN);
2087 tipc_link_xmit(buf, dnode, tsk->ref);
2090 sock->state = SS_DISCONNECTING;
2091 tipc_node_remove_conn(dnode, tsk->ref);
2094 case SS_DISCONNECTING:
2096 /* Discard any unreceived messages */
2097 __skb_queue_purge(&sk->sk_receive_queue);
2099 /* Wake up anyone sleeping in poll */
2100 sk->sk_state_change(sk);
2112 static void tipc_sk_timeout(unsigned long ref)
2114 struct tipc_sock *tsk;
2116 struct sk_buff *buf = NULL;
2117 u32 peer_port, peer_node;
2119 tsk = tipc_sk_get(ref);
2125 if (!tsk->connected) {
2129 peer_port = tsk_peer_port(tsk);
2130 peer_node = tsk_peer_node(tsk);
2132 if (tsk->probing_state == TIPC_CONN_PROBING) {
2133 /* Previous probe not answered -> self abort */
2134 buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
2135 SHORT_H_SIZE, 0, tipc_own_addr,
2136 peer_node, ref, peer_port,
2139 buf = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE,
2140 0, peer_node, tipc_own_addr,
2141 peer_port, ref, TIPC_OK);
2142 tsk->probing_state = TIPC_CONN_PROBING;
2143 k_start_timer(&tsk->timer, tsk->probing_interval);
2147 tipc_link_xmit(buf, peer_node, ref);
2152 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2153 struct tipc_name_seq const *seq)
2155 struct publication *publ;
2160 key = tsk->ref + tsk->pub_count + 1;
2161 if (key == tsk->ref)
2164 publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
2165 scope, tsk->ref, key);
2166 if (unlikely(!publ))
2169 list_add(&publ->pport_list, &tsk->publications);
2175 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2176 struct tipc_name_seq const *seq)
2178 struct publication *publ;
2179 struct publication *safe;
2182 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2184 if (publ->scope != scope)
2186 if (publ->type != seq->type)
2188 if (publ->lower != seq->lower)
2190 if (publ->upper != seq->upper)
2192 tipc_nametbl_withdraw(publ->type, publ->lower,
2193 publ->ref, publ->key);
2197 tipc_nametbl_withdraw(publ->type, publ->lower,
2198 publ->ref, publ->key);
2201 if (list_empty(&tsk->publications))
2206 static int tipc_sk_show(struct tipc_sock *tsk, char *buf,
2207 int len, int full_id)
2209 struct publication *publ;
2213 ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
2214 tipc_zone(tipc_own_addr),
2215 tipc_cluster(tipc_own_addr),
2216 tipc_node(tipc_own_addr), tsk->ref);
2218 ret = tipc_snprintf(buf, len, "%-10u:", tsk->ref);
2220 if (tsk->connected) {
2221 u32 dport = tsk_peer_port(tsk);
2222 u32 destnode = tsk_peer_node(tsk);
2224 ret += tipc_snprintf(buf + ret, len - ret,
2225 " connected to <%u.%u.%u:%u>",
2226 tipc_zone(destnode),
2227 tipc_cluster(destnode),
2228 tipc_node(destnode), dport);
2229 if (tsk->conn_type != 0)
2230 ret += tipc_snprintf(buf + ret, len - ret,
2231 " via {%u,%u}", tsk->conn_type,
2232 tsk->conn_instance);
2233 } else if (tsk->published) {
2234 ret += tipc_snprintf(buf + ret, len - ret, " bound to");
2235 list_for_each_entry(publ, &tsk->publications, pport_list) {
2236 if (publ->lower == publ->upper)
2237 ret += tipc_snprintf(buf + ret, len - ret,
2238 " {%u,%u}", publ->type,
2241 ret += tipc_snprintf(buf + ret, len - ret,
2242 " {%u,%u,%u}", publ->type,
2243 publ->lower, publ->upper);
2246 ret += tipc_snprintf(buf + ret, len - ret, "\n");
2250 struct sk_buff *tipc_sk_socks_show(void)
2252 struct sk_buff *buf;
2253 struct tlv_desc *rep_tlv;
2256 struct tipc_sock *tsk;
2260 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
2263 rep_tlv = (struct tlv_desc *)buf->data;
2264 pb = TLV_DATA(rep_tlv);
2265 pb_len = ULTRA_STRING_MAX_LEN;
2267 tsk = tipc_sk_get_next(&ref);
2268 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2269 lock_sock(&tsk->sk);
2270 str_len += tipc_sk_show(tsk, pb + str_len,
2271 pb_len - str_len, 0);
2272 release_sock(&tsk->sk);
2275 str_len += 1; /* for "\0" */
2276 skb_put(buf, TLV_SPACE(str_len));
2277 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
2282 /* tipc_sk_reinit: set non-zero address in all existing sockets
2283 * when we go from standalone to network mode.
2285 void tipc_sk_reinit(void)
2287 struct tipc_msg *msg;
2289 struct tipc_sock *tsk = tipc_sk_get_next(&ref);
2291 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2292 lock_sock(&tsk->sk);
2294 msg_set_prevnode(msg, tipc_own_addr);
2295 msg_set_orignode(msg, tipc_own_addr);
2296 release_sock(&tsk->sk);
2302 * struct reference - TIPC socket reference entry
2303 * @tsk: pointer to socket associated with reference entry
2304 * @ref: reference value for socket (combines instance & array index info)
2307 struct tipc_sock *tsk;
2312 * struct tipc_ref_table - table of TIPC socket reference entries
2313 * @entries: pointer to array of reference entries
2314 * @capacity: array index of first unusable entry
2315 * @init_point: array index of first uninitialized entry
2316 * @first_free: array index of first unused socket reference entry
2317 * @last_free: array index of last unused socket reference entry
2318 * @index_mask: bitmask for array index portion of reference values
2319 * @start_mask: initial value for instance value portion of reference values
2322 struct reference *entries;
2331 /* Socket reference table consists of 2**N entries.
2333 * State Socket ptr Reference
2334 * ----- ---------- ---------
2335 * In use non-NULL XXXX|own index
2336 * (XXXX changes each time entry is acquired)
2337 * Free NULL YYYY|next free index
2338 * (YYYY is one more than last used XXXX)
2339 * Uninitialized NULL 0
2341 * Entry 0 is not used; this allows index 0 to denote the end of the free list.
2343 * Note that a reference value of 0 does not necessarily indicate that an
2344 * entry is uninitialized, since the last entry in the free list could also
2345 * have a reference value of 0 (although this is unlikely).
2348 static struct ref_table tipc_ref_table;
2350 static DEFINE_RWLOCK(ref_table_lock);
2353 * tipc_ref_table_init - create reference table for sockets
2355 int tipc_sk_ref_table_init(u32 req_sz, u32 start)
2357 struct reference *table;
2360 /* account for unused entry, then round up size to a power of 2 */
2363 for (actual_sz = 16; actual_sz < req_sz; actual_sz <<= 1) {
2367 /* allocate table & mark all entries as uninitialized */
2368 table = vzalloc(actual_sz * sizeof(struct reference));
2372 tipc_ref_table.entries = table;
2373 tipc_ref_table.capacity = req_sz;
2374 tipc_ref_table.init_point = 1;
2375 tipc_ref_table.first_free = 0;
2376 tipc_ref_table.last_free = 0;
2377 tipc_ref_table.index_mask = actual_sz - 1;
2378 tipc_ref_table.start_mask = start & ~tipc_ref_table.index_mask;
2384 * tipc_ref_table_stop - destroy reference table for sockets
2386 void tipc_sk_ref_table_stop(void)
2388 if (!tipc_ref_table.entries)
2390 vfree(tipc_ref_table.entries);
2391 tipc_ref_table.entries = NULL;
2394 /* tipc_ref_acquire - create reference to a socket
2396 * Register an socket pointer in the reference table.
2397 * Returns a unique reference value that is used from then on to retrieve the
2398 * socket pointer, or to determine if the socket has been deregistered.
2400 u32 tipc_sk_ref_acquire(struct tipc_sock *tsk)
2404 u32 next_plus_upper;
2406 struct reference *entry;
2408 if (unlikely(!tsk)) {
2409 pr_err("Attempt to acquire ref. to non-existent obj\n");
2412 if (unlikely(!tipc_ref_table.entries)) {
2413 pr_err("Ref. table not found in acquisition attempt\n");
2417 /* Take a free entry, if available; otherwise initialize a new one */
2418 write_lock_bh(&ref_table_lock);
2419 index = tipc_ref_table.first_free;
2420 entry = &tipc_ref_table.entries[index];
2422 if (likely(index)) {
2423 index = tipc_ref_table.first_free;
2424 entry = &tipc_ref_table.entries[index];
2425 index_mask = tipc_ref_table.index_mask;
2426 next_plus_upper = entry->ref;
2427 tipc_ref_table.first_free = next_plus_upper & index_mask;
2428 ref = (next_plus_upper & ~index_mask) + index;
2430 } else if (tipc_ref_table.init_point < tipc_ref_table.capacity) {
2431 index = tipc_ref_table.init_point++;
2432 entry = &tipc_ref_table.entries[index];
2433 ref = tipc_ref_table.start_mask + index;
2440 write_unlock_bh(&ref_table_lock);
2444 /* tipc_sk_ref_discard - invalidate reference to an socket
2446 * Disallow future references to an socket and free up the entry for re-use.
2448 void tipc_sk_ref_discard(u32 ref)
2450 struct reference *entry;
2454 if (unlikely(!tipc_ref_table.entries)) {
2455 pr_err("Ref. table not found during discard attempt\n");
2459 index_mask = tipc_ref_table.index_mask;
2460 index = ref & index_mask;
2461 entry = &tipc_ref_table.entries[index];
2463 write_lock_bh(&ref_table_lock);
2465 if (unlikely(!entry->tsk)) {
2466 pr_err("Attempt to discard ref. to non-existent socket\n");
2469 if (unlikely(entry->ref != ref)) {
2470 pr_err("Attempt to discard non-existent reference\n");
2474 /* Mark entry as unused; increment instance part of entry's
2475 * reference to invalidate any subsequent references
2479 entry->ref = (ref & ~index_mask) + (index_mask + 1);
2481 /* Append entry to free entry list */
2482 if (unlikely(tipc_ref_table.first_free == 0))
2483 tipc_ref_table.first_free = index;
2485 tipc_ref_table.entries[tipc_ref_table.last_free].ref |= index;
2486 tipc_ref_table.last_free = index;
2488 write_unlock_bh(&ref_table_lock);
2491 /* tipc_sk_get - find referenced socket and return pointer to it
2493 struct tipc_sock *tipc_sk_get(u32 ref)
2495 struct reference *entry;
2496 struct tipc_sock *tsk;
2498 if (unlikely(!tipc_ref_table.entries))
2500 read_lock_bh(&ref_table_lock);
2501 entry = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
2503 if (likely(tsk && (entry->ref == ref)))
2504 sock_hold(&tsk->sk);
2507 read_unlock_bh(&ref_table_lock);
2511 /* tipc_sk_get_next - lock & return next socket after referenced one
2513 struct tipc_sock *tipc_sk_get_next(u32 *ref)
2515 struct reference *entry;
2516 struct tipc_sock *tsk = NULL;
2517 uint index = *ref & tipc_ref_table.index_mask;
2519 read_lock_bh(&ref_table_lock);
2520 while (++index < tipc_ref_table.capacity) {
2521 entry = &tipc_ref_table.entries[index];
2525 sock_hold(&tsk->sk);
2529 read_unlock_bh(&ref_table_lock);
2533 static void tipc_sk_put(struct tipc_sock *tsk)
2539 * tipc_setsockopt - set socket option
2540 * @sock: socket structure
2541 * @lvl: option level
2542 * @opt: option identifier
2543 * @ov: pointer to new option value
2544 * @ol: length of option value
2546 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2547 * (to ease compatibility).
2549 * Returns 0 on success, errno otherwise
2551 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2552 char __user *ov, unsigned int ol)
2554 struct sock *sk = sock->sk;
2555 struct tipc_sock *tsk = tipc_sk(sk);
2559 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2561 if (lvl != SOL_TIPC)
2562 return -ENOPROTOOPT;
2563 if (ol < sizeof(value))
2565 res = get_user(value, (u32 __user *)ov);
2572 case TIPC_IMPORTANCE:
2573 res = tsk_set_importance(tsk, value);
2575 case TIPC_SRC_DROPPABLE:
2576 if (sock->type != SOCK_STREAM)
2577 tsk_set_unreliable(tsk, value);
2581 case TIPC_DEST_DROPPABLE:
2582 tsk_set_unreturnable(tsk, value);
2584 case TIPC_CONN_TIMEOUT:
2585 tipc_sk(sk)->conn_timeout = value;
2586 /* no need to set "res", since already 0 at this point */
2598 * tipc_getsockopt - get socket option
2599 * @sock: socket structure
2600 * @lvl: option level
2601 * @opt: option identifier
2602 * @ov: receptacle for option value
2603 * @ol: receptacle for length of option value
2605 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2606 * (to ease compatibility).
2608 * Returns 0 on success, errno otherwise
2610 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2611 char __user *ov, int __user *ol)
2613 struct sock *sk = sock->sk;
2614 struct tipc_sock *tsk = tipc_sk(sk);
2619 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2620 return put_user(0, ol);
2621 if (lvl != SOL_TIPC)
2622 return -ENOPROTOOPT;
2623 res = get_user(len, ol);
2630 case TIPC_IMPORTANCE:
2631 value = tsk_importance(tsk);
2633 case TIPC_SRC_DROPPABLE:
2634 value = tsk_unreliable(tsk);
2636 case TIPC_DEST_DROPPABLE:
2637 value = tsk_unreturnable(tsk);
2639 case TIPC_CONN_TIMEOUT:
2640 value = tsk->conn_timeout;
2641 /* no need to set "res", since already 0 at this point */
2643 case TIPC_NODE_RECVQ_DEPTH:
2644 value = 0; /* was tipc_queue_size, now obsolete */
2646 case TIPC_SOCK_RECVQ_DEPTH:
2647 value = skb_queue_len(&sk->sk_receive_queue);
2656 return res; /* "get" failed */
2658 if (len < sizeof(value))
2661 if (copy_to_user(ov, &value, sizeof(value)))
2664 return put_user(sizeof(value), ol);
2667 static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg)
2669 struct tipc_sioc_ln_req lnr;
2670 void __user *argp = (void __user *)arg;
2673 case SIOCGETLINKNAME:
2674 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2676 if (!tipc_node_get_linkname(lnr.bearer_id & 0xffff, lnr.peer,
2677 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2678 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2682 return -EADDRNOTAVAIL;
2684 return -ENOIOCTLCMD;
2688 /* Protocol switches for the various types of TIPC sockets */
2690 static const struct proto_ops msg_ops = {
2691 .owner = THIS_MODULE,
2693 .release = tipc_release,
2695 .connect = tipc_connect,
2696 .socketpair = sock_no_socketpair,
2697 .accept = sock_no_accept,
2698 .getname = tipc_getname,
2700 .ioctl = tipc_ioctl,
2701 .listen = sock_no_listen,
2702 .shutdown = tipc_shutdown,
2703 .setsockopt = tipc_setsockopt,
2704 .getsockopt = tipc_getsockopt,
2705 .sendmsg = tipc_sendmsg,
2706 .recvmsg = tipc_recvmsg,
2707 .mmap = sock_no_mmap,
2708 .sendpage = sock_no_sendpage
2711 static const struct proto_ops packet_ops = {
2712 .owner = THIS_MODULE,
2714 .release = tipc_release,
2716 .connect = tipc_connect,
2717 .socketpair = sock_no_socketpair,
2718 .accept = tipc_accept,
2719 .getname = tipc_getname,
2721 .ioctl = tipc_ioctl,
2722 .listen = tipc_listen,
2723 .shutdown = tipc_shutdown,
2724 .setsockopt = tipc_setsockopt,
2725 .getsockopt = tipc_getsockopt,
2726 .sendmsg = tipc_send_packet,
2727 .recvmsg = tipc_recvmsg,
2728 .mmap = sock_no_mmap,
2729 .sendpage = sock_no_sendpage
2732 static const struct proto_ops stream_ops = {
2733 .owner = THIS_MODULE,
2735 .release = tipc_release,
2737 .connect = tipc_connect,
2738 .socketpair = sock_no_socketpair,
2739 .accept = tipc_accept,
2740 .getname = tipc_getname,
2742 .ioctl = tipc_ioctl,
2743 .listen = tipc_listen,
2744 .shutdown = tipc_shutdown,
2745 .setsockopt = tipc_setsockopt,
2746 .getsockopt = tipc_getsockopt,
2747 .sendmsg = tipc_send_stream,
2748 .recvmsg = tipc_recv_stream,
2749 .mmap = sock_no_mmap,
2750 .sendpage = sock_no_sendpage
2753 static const struct net_proto_family tipc_family_ops = {
2754 .owner = THIS_MODULE,
2756 .create = tipc_sk_create
2759 static struct proto tipc_proto = {
2761 .owner = THIS_MODULE,
2762 .obj_size = sizeof(struct tipc_sock),
2763 .sysctl_rmem = sysctl_tipc_rmem
2766 static struct proto tipc_proto_kern = {
2768 .obj_size = sizeof(struct tipc_sock),
2769 .sysctl_rmem = sysctl_tipc_rmem
2773 * tipc_socket_init - initialize TIPC socket interface
2775 * Returns 0 on success, errno otherwise
2777 int tipc_socket_init(void)
2781 res = proto_register(&tipc_proto, 1);
2783 pr_err("Failed to register TIPC protocol type\n");
2787 res = sock_register(&tipc_family_ops);
2789 pr_err("Failed to register TIPC socket type\n");
2790 proto_unregister(&tipc_proto);
2798 * tipc_socket_stop - stop TIPC socket interface
2800 void tipc_socket_stop(void)
2802 sock_unregister(tipc_family_ops.family);
2803 proto_unregister(&tipc_proto);