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;
124 static const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
125 [TIPC_NLA_SOCK_UNSPEC] = { .type = NLA_UNSPEC },
126 [TIPC_NLA_SOCK_ADDR] = { .type = NLA_U32 },
127 [TIPC_NLA_SOCK_REF] = { .type = NLA_U32 },
128 [TIPC_NLA_SOCK_CON] = { .type = NLA_NESTED },
129 [TIPC_NLA_SOCK_HAS_PUBL] = { .type = NLA_FLAG }
133 * Revised TIPC socket locking policy:
135 * Most socket operations take the standard socket lock when they start
136 * and hold it until they finish (or until they need to sleep). Acquiring
137 * this lock grants the owner exclusive access to the fields of the socket
138 * data structures, with the exception of the backlog queue. A few socket
139 * operations can be done without taking the socket lock because they only
140 * read socket information that never changes during the life of the socket.
142 * Socket operations may acquire the lock for the associated TIPC port if they
143 * need to perform an operation on the port. If any routine needs to acquire
144 * both the socket lock and the port lock it must take the socket lock first
145 * to avoid the risk of deadlock.
147 * The dispatcher handling incoming messages cannot grab the socket lock in
148 * the standard fashion, since invoked it runs at the BH level and cannot block.
149 * Instead, it checks to see if the socket lock is currently owned by someone,
150 * and either handles the message itself or adds it to the socket's backlog
151 * queue; in the latter case the queued message is processed once the process
152 * owning the socket lock releases it.
154 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
155 * the problem of a blocked socket operation preventing any other operations
156 * from occurring. However, applications must be careful if they have
157 * multiple threads trying to send (or receive) on the same socket, as these
158 * operations might interfere with each other. For example, doing a connect
159 * and a receive at the same time might allow the receive to consume the
160 * ACK message meant for the connect. While additional work could be done
161 * to try and overcome this, it doesn't seem to be worthwhile at the present.
163 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
164 * that another operation that must be performed in a non-blocking manner is
165 * not delayed for very long because the lock has already been taken.
167 * NOTE: This code assumes that certain fields of a port/socket pair are
168 * constant over its lifetime; such fields can be examined without taking
169 * the socket lock and/or port lock, and do not need to be re-read even
170 * after resuming processing after waiting. These fields include:
172 * - pointer to socket sk structure (aka tipc_sock structure)
173 * - pointer to port structure
177 static u32 tsk_peer_node(struct tipc_sock *tsk)
179 return msg_destnode(&tsk->phdr);
182 static u32 tsk_peer_port(struct tipc_sock *tsk)
184 return msg_destport(&tsk->phdr);
187 static bool tsk_unreliable(struct tipc_sock *tsk)
189 return msg_src_droppable(&tsk->phdr) != 0;
192 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
194 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
197 static bool tsk_unreturnable(struct tipc_sock *tsk)
199 return msg_dest_droppable(&tsk->phdr) != 0;
202 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
204 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
207 static int tsk_importance(struct tipc_sock *tsk)
209 return msg_importance(&tsk->phdr);
212 static int tsk_set_importance(struct tipc_sock *tsk, int imp)
214 if (imp > TIPC_CRITICAL_IMPORTANCE)
216 msg_set_importance(&tsk->phdr, (u32)imp);
220 static struct tipc_sock *tipc_sk(const struct sock *sk)
222 return container_of(sk, struct tipc_sock, sk);
225 static int tsk_conn_cong(struct tipc_sock *tsk)
227 return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
231 * tsk_advance_rx_queue - discard first buffer in socket receive queue
233 * Caller must hold socket lock
235 static void tsk_advance_rx_queue(struct sock *sk)
237 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
241 * tsk_rej_rx_queue - reject all buffers in socket receive queue
243 * Caller must hold socket lock
245 static void tsk_rej_rx_queue(struct sock *sk)
250 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) {
251 if (tipc_msg_reverse(skb, &dnode, TIPC_ERR_NO_PORT))
252 tipc_link_xmit_skb(skb, dnode, 0);
256 /* tsk_peer_msg - verify if message was sent by connected port's peer
258 * Handles cases where the node's network address has changed from
259 * the default of <0.0.0> to its configured setting.
261 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
263 u32 peer_port = tsk_peer_port(tsk);
267 if (unlikely(!tsk->connected))
270 if (unlikely(msg_origport(msg) != peer_port))
273 orig_node = msg_orignode(msg);
274 peer_node = tsk_peer_node(tsk);
276 if (likely(orig_node == peer_node))
279 if (!orig_node && (peer_node == tipc_own_addr))
282 if (!peer_node && (orig_node == tipc_own_addr))
289 * tipc_sk_create - create a TIPC socket
290 * @net: network namespace (must be default network)
291 * @sock: pre-allocated socket structure
292 * @protocol: protocol indicator (must be 0)
293 * @kern: caused by kernel or by userspace?
295 * This routine creates additional data structures used by the TIPC socket,
296 * initializes them, and links them together.
298 * Returns 0 on success, errno otherwise
300 static int tipc_sk_create(struct net *net, struct socket *sock,
301 int protocol, int kern)
303 const struct proto_ops *ops;
306 struct tipc_sock *tsk;
307 struct tipc_msg *msg;
310 /* Validate arguments */
311 if (unlikely(protocol != 0))
312 return -EPROTONOSUPPORT;
314 switch (sock->type) {
317 state = SS_UNCONNECTED;
321 state = SS_UNCONNECTED;
332 /* Allocate socket's protocol area */
334 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
336 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto_kern);
342 ref = tipc_sk_ref_acquire(tsk);
344 pr_warn("Socket create failed; reference table exhausted\n");
347 tsk->max_pkt = MAX_PKT_DEFAULT;
349 INIT_LIST_HEAD(&tsk->publications);
351 tipc_msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
353 msg_set_origport(msg, ref);
355 /* Finish initializing socket data structures */
358 sock_init_data(sock, sk);
359 k_init_timer(&tsk->timer, (Handler)tipc_sk_timeout, ref);
360 sk->sk_backlog_rcv = tipc_backlog_rcv;
361 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
362 sk->sk_data_ready = tipc_data_ready;
363 sk->sk_write_space = tipc_write_space;
364 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
365 tsk->sent_unacked = 0;
366 atomic_set(&tsk->dupl_rcvcnt, 0);
368 if (sock->state == SS_READY) {
369 tsk_set_unreturnable(tsk, true);
370 if (sock->type == SOCK_DGRAM)
371 tsk_set_unreliable(tsk, true);
377 * tipc_sock_create_local - create TIPC socket from inside TIPC module
378 * @type: socket type - SOCK_RDM or SOCK_SEQPACKET
380 * We cannot use sock_creat_kern here because it bumps module user count.
381 * Since socket owner and creator is the same module we must make sure
382 * that module count remains zero for module local sockets, otherwise
383 * we cannot do rmmod.
385 * Returns 0 on success, errno otherwise
387 int tipc_sock_create_local(int type, struct socket **res)
391 rc = sock_create_lite(AF_TIPC, type, 0, res);
393 pr_err("Failed to create kernel socket\n");
396 tipc_sk_create(&init_net, *res, 0, 1);
402 * tipc_sock_release_local - release socket created by tipc_sock_create_local
403 * @sock: the socket to be released.
405 * Module reference count is not incremented when such sockets are created,
406 * so we must keep it from being decremented when they are released.
408 void tipc_sock_release_local(struct socket *sock)
416 * tipc_sock_accept_local - accept a connection on a socket created
417 * with tipc_sock_create_local. Use this function to avoid that
418 * module reference count is inadvertently incremented.
420 * @sock: the accepting socket
421 * @newsock: reference to the new socket to be created
422 * @flags: socket flags
425 int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
428 struct sock *sk = sock->sk;
431 ret = sock_create_lite(sk->sk_family, sk->sk_type,
432 sk->sk_protocol, newsock);
436 ret = tipc_accept(sock, *newsock, flags);
438 sock_release(*newsock);
441 (*newsock)->ops = sock->ops;
446 * tipc_release - destroy a TIPC socket
447 * @sock: socket to destroy
449 * This routine cleans up any messages that are still queued on the socket.
450 * For DGRAM and RDM socket types, all queued messages are rejected.
451 * For SEQPACKET and STREAM socket types, the first message is rejected
452 * and any others are discarded. (If the first message on a STREAM socket
453 * is partially-read, it is discarded and the next one is rejected instead.)
455 * NOTE: Rejected messages are not necessarily returned to the sender! They
456 * are returned or discarded according to the "destination droppable" setting
457 * specified for the message by the sender.
459 * Returns 0 on success, errno otherwise
461 static int tipc_release(struct socket *sock)
463 struct sock *sk = sock->sk;
464 struct tipc_sock *tsk;
469 * Exit if socket isn't fully initialized (occurs when a failed accept()
470 * releases a pre-allocated child socket that was never used)
479 * Reject all unreceived messages, except on an active connection
480 * (which disconnects locally & sends a 'FIN+' to peer)
482 dnode = tsk_peer_node(tsk);
483 while (sock->state != SS_DISCONNECTING) {
484 skb = __skb_dequeue(&sk->sk_receive_queue);
487 if (TIPC_SKB_CB(skb)->handle != NULL)
490 if ((sock->state == SS_CONNECTING) ||
491 (sock->state == SS_CONNECTED)) {
492 sock->state = SS_DISCONNECTING;
494 tipc_node_remove_conn(dnode, tsk->ref);
496 if (tipc_msg_reverse(skb, &dnode, TIPC_ERR_NO_PORT))
497 tipc_link_xmit_skb(skb, dnode, 0);
501 tipc_sk_withdraw(tsk, 0, NULL);
502 tipc_sk_ref_discard(tsk->ref);
503 k_cancel_timer(&tsk->timer);
504 if (tsk->connected) {
505 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
506 SHORT_H_SIZE, 0, dnode, tipc_own_addr,
508 tsk->ref, TIPC_ERR_NO_PORT);
510 tipc_link_xmit_skb(skb, dnode, tsk->ref);
511 tipc_node_remove_conn(dnode, tsk->ref);
513 k_term_timer(&tsk->timer);
515 /* Discard any remaining (connection-based) messages in receive queue */
516 __skb_queue_purge(&sk->sk_receive_queue);
518 /* Reject any messages that accumulated in backlog queue */
519 sock->state = SS_DISCONNECTING;
528 * tipc_bind - associate or disassocate TIPC name(s) with a socket
529 * @sock: socket structure
530 * @uaddr: socket address describing name(s) and desired operation
531 * @uaddr_len: size of socket address data structure
533 * Name and name sequence binding is indicated using a positive scope value;
534 * a negative scope value unbinds the specified name. Specifying no name
535 * (i.e. a socket address length of 0) unbinds all names from the socket.
537 * Returns 0 on success, errno otherwise
539 * NOTE: This routine doesn't need to take the socket lock since it doesn't
540 * access any non-constant socket information.
542 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
545 struct sock *sk = sock->sk;
546 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
547 struct tipc_sock *tsk = tipc_sk(sk);
551 if (unlikely(!uaddr_len)) {
552 res = tipc_sk_withdraw(tsk, 0, NULL);
556 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
560 if (addr->family != AF_TIPC) {
565 if (addr->addrtype == TIPC_ADDR_NAME)
566 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
567 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
572 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
573 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
574 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
579 res = (addr->scope > 0) ?
580 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
581 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
588 * tipc_getname - get port ID of socket or peer socket
589 * @sock: socket structure
590 * @uaddr: area for returned socket address
591 * @uaddr_len: area for returned length of socket address
592 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
594 * Returns 0 on success, errno otherwise
596 * NOTE: This routine doesn't need to take the socket lock since it only
597 * accesses socket information that is unchanging (or which changes in
598 * a completely predictable manner).
600 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
601 int *uaddr_len, int peer)
603 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
604 struct tipc_sock *tsk = tipc_sk(sock->sk);
606 memset(addr, 0, sizeof(*addr));
608 if ((sock->state != SS_CONNECTED) &&
609 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
611 addr->addr.id.ref = tsk_peer_port(tsk);
612 addr->addr.id.node = tsk_peer_node(tsk);
614 addr->addr.id.ref = tsk->ref;
615 addr->addr.id.node = tipc_own_addr;
618 *uaddr_len = sizeof(*addr);
619 addr->addrtype = TIPC_ADDR_ID;
620 addr->family = AF_TIPC;
622 addr->addr.name.domain = 0;
628 * tipc_poll - read and possibly block on pollmask
629 * @file: file structure associated with the socket
630 * @sock: socket for which to calculate the poll bits
633 * Returns pollmask value
636 * It appears that the usual socket locking mechanisms are not useful here
637 * since the pollmask info is potentially out-of-date the moment this routine
638 * exits. TCP and other protocols seem to rely on higher level poll routines
639 * to handle any preventable race conditions, so TIPC will do the same ...
641 * TIPC sets the returned events as follows:
643 * socket state flags set
644 * ------------ ---------
645 * unconnected no read flags
646 * POLLOUT if port is not congested
648 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
651 * connected POLLIN/POLLRDNORM if data in rx queue
652 * POLLOUT if port is not congested
654 * disconnecting POLLIN/POLLRDNORM/POLLHUP
657 * listening POLLIN if SYN in rx queue
660 * ready POLLIN/POLLRDNORM if data in rx queue
661 * [connectionless] POLLOUT (since port cannot be congested)
663 * IMPORTANT: The fact that a read or write operation is indicated does NOT
664 * imply that the operation will succeed, merely that it should be performed
665 * and will not block.
667 static unsigned int tipc_poll(struct file *file, struct socket *sock,
670 struct sock *sk = sock->sk;
671 struct tipc_sock *tsk = tipc_sk(sk);
674 sock_poll_wait(file, sk_sleep(sk), wait);
676 switch ((int)sock->state) {
683 if (!tsk->link_cong && !tsk_conn_cong(tsk))
688 if (!skb_queue_empty(&sk->sk_receive_queue))
689 mask |= (POLLIN | POLLRDNORM);
691 case SS_DISCONNECTING:
692 mask = (POLLIN | POLLRDNORM | POLLHUP);
700 * tipc_sendmcast - send multicast message
701 * @sock: socket structure
702 * @seq: destination address
703 * @msg: message to send
704 * @dsz: total length of message data
705 * @timeo: timeout to wait for wakeup
707 * Called from function tipc_sendmsg(), which has done all sanity checks
708 * Returns the number of bytes sent on success, or errno
710 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
711 struct msghdr *msg, size_t dsz, long timeo)
713 struct sock *sk = sock->sk;
714 struct tipc_msg *mhdr = &tipc_sk(sk)->phdr;
715 struct sk_buff_head head;
719 msg_set_type(mhdr, TIPC_MCAST_MSG);
720 msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
721 msg_set_destport(mhdr, 0);
722 msg_set_destnode(mhdr, 0);
723 msg_set_nametype(mhdr, seq->type);
724 msg_set_namelower(mhdr, seq->lower);
725 msg_set_nameupper(mhdr, seq->upper);
726 msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
729 mtu = tipc_bclink_get_mtu();
730 __skb_queue_head_init(&head);
731 rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, &head);
732 if (unlikely(rc < 0))
736 rc = tipc_bclink_xmit(&head);
737 if (likely(rc >= 0)) {
743 if (rc != -ELINKCONG)
745 tipc_sk(sk)->link_cong = 1;
746 rc = tipc_wait_for_sndmsg(sock, &timeo);
748 __skb_queue_purge(&head);
753 /* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets
755 void tipc_sk_mcast_rcv(struct sk_buff *buf)
757 struct tipc_msg *msg = buf_msg(buf);
758 struct tipc_port_list dports = {0, NULL, };
759 struct tipc_port_list *item;
761 uint i, last, dst = 0;
762 u32 scope = TIPC_CLUSTER_SCOPE;
764 if (in_own_node(msg_orignode(msg)))
765 scope = TIPC_NODE_SCOPE;
767 /* Create destination port list: */
768 tipc_nametbl_mc_translate(msg_nametype(msg),
779 for (item = &dports; item; item = item->next) {
780 for (i = 0; i < PLSIZE && ++dst <= last; i++) {
781 b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf;
783 pr_warn("Failed do clone mcast rcv buffer\n");
786 msg_set_destport(msg, item->ports[i]);
790 tipc_port_list_free(&dports);
794 * tipc_sk_proto_rcv - receive a connection mng protocol message
795 * @tsk: receiving socket
796 * @dnode: node to send response message to, if any
797 * @buf: buffer containing protocol message
798 * Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if
799 * (CONN_PROBE_REPLY) message should be forwarded.
801 static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode,
804 struct tipc_msg *msg = buf_msg(buf);
807 /* Ignore if connection cannot be validated: */
808 if (!tsk_peer_msg(tsk, msg))
811 tsk->probing_state = TIPC_CONN_OK;
813 if (msg_type(msg) == CONN_ACK) {
814 conn_cong = tsk_conn_cong(tsk);
815 tsk->sent_unacked -= msg_msgcnt(msg);
817 tsk->sk.sk_write_space(&tsk->sk);
818 } else if (msg_type(msg) == CONN_PROBE) {
819 if (!tipc_msg_reverse(buf, dnode, TIPC_OK))
821 msg_set_type(msg, CONN_PROBE_REPLY);
824 /* Do nothing if msg_type() == CONN_PROBE_REPLY */
830 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
832 struct sock *sk = sock->sk;
833 struct tipc_sock *tsk = tipc_sk(sk);
838 int err = sock_error(sk);
841 if (sock->state == SS_DISCONNECTING)
845 if (signal_pending(current))
846 return sock_intr_errno(*timeo_p);
848 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
849 done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
850 finish_wait(sk_sleep(sk), &wait);
856 * tipc_sendmsg - send message in connectionless manner
857 * @iocb: if NULL, indicates that socket lock is already held
858 * @sock: socket structure
859 * @m: message to send
860 * @dsz: amount of user data to be sent
862 * Message must have an destination specified explicitly.
863 * Used for SOCK_RDM and SOCK_DGRAM messages,
864 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
865 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
867 * Returns the number of bytes sent on success, or errno otherwise
869 static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
870 struct msghdr *m, size_t dsz)
872 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
873 struct sock *sk = sock->sk;
874 struct tipc_sock *tsk = tipc_sk(sk);
875 struct tipc_msg *mhdr = &tsk->phdr;
877 struct sk_buff_head head;
879 struct tipc_name_seq *seq = &dest->addr.nameseq;
885 return -EDESTADDRREQ;
887 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
888 (dest->family != AF_TIPC)))
891 if (dsz > TIPC_MAX_USER_MSG_SIZE)
897 if (unlikely(sock->state != SS_READY)) {
898 if (sock->state == SS_LISTENING) {
902 if (sock->state != SS_UNCONNECTED) {
906 if (tsk->published) {
910 if (dest->addrtype == TIPC_ADDR_NAME) {
911 tsk->conn_type = dest->addr.name.name.type;
912 tsk->conn_instance = dest->addr.name.name.instance;
916 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
918 if (dest->addrtype == TIPC_ADDR_MCAST) {
919 rc = tipc_sendmcast(sock, seq, m, dsz, timeo);
921 } else if (dest->addrtype == TIPC_ADDR_NAME) {
922 u32 type = dest->addr.name.name.type;
923 u32 inst = dest->addr.name.name.instance;
924 u32 domain = dest->addr.name.domain;
927 msg_set_type(mhdr, TIPC_NAMED_MSG);
928 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
929 msg_set_nametype(mhdr, type);
930 msg_set_nameinst(mhdr, inst);
931 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
932 dport = tipc_nametbl_translate(type, inst, &dnode);
933 msg_set_destnode(mhdr, dnode);
934 msg_set_destport(mhdr, dport);
935 if (unlikely(!dport && !dnode)) {
939 } else if (dest->addrtype == TIPC_ADDR_ID) {
940 dnode = dest->addr.id.node;
941 msg_set_type(mhdr, TIPC_DIRECT_MSG);
942 msg_set_lookup_scope(mhdr, 0);
943 msg_set_destnode(mhdr, dnode);
944 msg_set_destport(mhdr, dest->addr.id.ref);
945 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
949 mtu = tipc_node_get_mtu(dnode, tsk->ref);
950 __skb_queue_head_init(&head);
951 rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, &head);
956 skb = skb_peek(&head);
957 TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong;
958 rc = tipc_link_xmit(&head, dnode, tsk->ref);
959 if (likely(rc >= 0)) {
960 if (sock->state != SS_READY)
961 sock->state = SS_CONNECTING;
967 if (rc != -ELINKCONG)
970 rc = tipc_wait_for_sndmsg(sock, &timeo);
972 __skb_queue_purge(&head);
981 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
983 struct sock *sk = sock->sk;
984 struct tipc_sock *tsk = tipc_sk(sk);
989 int err = sock_error(sk);
992 if (sock->state == SS_DISCONNECTING)
994 else if (sock->state != SS_CONNECTED)
998 if (signal_pending(current))
999 return sock_intr_errno(*timeo_p);
1001 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1002 done = sk_wait_event(sk, timeo_p,
1004 !tsk_conn_cong(tsk)) ||
1006 finish_wait(sk_sleep(sk), &wait);
1012 * tipc_send_stream - send stream-oriented data
1014 * @sock: socket structure
1016 * @dsz: total length of data to be transmitted
1018 * Used for SOCK_STREAM data.
1020 * Returns the number of bytes sent on success (or partial success),
1021 * or errno if no data sent
1023 static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
1024 struct msghdr *m, size_t dsz)
1026 struct sock *sk = sock->sk;
1027 struct tipc_sock *tsk = tipc_sk(sk);
1028 struct tipc_msg *mhdr = &tsk->phdr;
1029 struct sk_buff_head head;
1030 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1035 uint mtu, send, sent = 0;
1037 /* Handle implied connection establishment */
1038 if (unlikely(dest)) {
1039 rc = tipc_sendmsg(iocb, sock, m, dsz);
1040 if (dsz && (dsz == rc))
1041 tsk->sent_unacked = 1;
1044 if (dsz > (uint)INT_MAX)
1050 if (unlikely(sock->state != SS_CONNECTED)) {
1051 if (sock->state == SS_DISCONNECTING)
1058 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1059 dnode = tsk_peer_node(tsk);
1063 send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
1064 __skb_queue_head_init(&head);
1065 rc = tipc_msg_build(mhdr, m, sent, send, mtu, &head);
1066 if (unlikely(rc < 0))
1069 if (likely(!tsk_conn_cong(tsk))) {
1070 rc = tipc_link_xmit(&head, dnode, ref);
1072 tsk->sent_unacked++;
1078 if (rc == -EMSGSIZE) {
1079 tsk->max_pkt = tipc_node_get_mtu(dnode, ref);
1082 if (rc != -ELINKCONG)
1086 rc = tipc_wait_for_sndpkt(sock, &timeo);
1088 __skb_queue_purge(&head);
1093 return sent ? sent : rc;
1097 * tipc_send_packet - send a connection-oriented message
1098 * @iocb: if NULL, indicates that socket lock is already held
1099 * @sock: socket structure
1100 * @m: message to send
1101 * @dsz: length of data to be transmitted
1103 * Used for SOCK_SEQPACKET messages.
1105 * Returns the number of bytes sent on success, or errno otherwise
1107 static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
1108 struct msghdr *m, size_t dsz)
1110 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1113 return tipc_send_stream(iocb, sock, m, dsz);
1116 /* tipc_sk_finish_conn - complete the setup of a connection
1118 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1121 struct tipc_msg *msg = &tsk->phdr;
1123 msg_set_destnode(msg, peer_node);
1124 msg_set_destport(msg, peer_port);
1125 msg_set_type(msg, TIPC_CONN_MSG);
1126 msg_set_lookup_scope(msg, 0);
1127 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1129 tsk->probing_interval = CONN_PROBING_INTERVAL;
1130 tsk->probing_state = TIPC_CONN_OK;
1132 k_start_timer(&tsk->timer, tsk->probing_interval);
1133 tipc_node_add_conn(peer_node, tsk->ref, peer_port);
1134 tsk->max_pkt = tipc_node_get_mtu(peer_node, tsk->ref);
1138 * set_orig_addr - capture sender's address for received message
1139 * @m: descriptor for message info
1140 * @msg: received message header
1142 * Note: Address is not captured if not requested by receiver.
1144 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
1146 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
1149 addr->family = AF_TIPC;
1150 addr->addrtype = TIPC_ADDR_ID;
1151 memset(&addr->addr, 0, sizeof(addr->addr));
1152 addr->addr.id.ref = msg_origport(msg);
1153 addr->addr.id.node = msg_orignode(msg);
1154 addr->addr.name.domain = 0; /* could leave uninitialized */
1155 addr->scope = 0; /* could leave uninitialized */
1156 m->msg_namelen = sizeof(struct sockaddr_tipc);
1161 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1162 * @m: descriptor for message info
1163 * @msg: received message header
1164 * @tsk: TIPC port associated with message
1166 * Note: Ancillary data is not captured if not requested by receiver.
1168 * Returns 0 if successful, otherwise errno
1170 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1171 struct tipc_sock *tsk)
1179 if (likely(m->msg_controllen == 0))
1182 /* Optionally capture errored message object(s) */
1183 err = msg ? msg_errcode(msg) : 0;
1184 if (unlikely(err)) {
1186 anc_data[1] = msg_data_sz(msg);
1187 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1191 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1198 /* Optionally capture message destination object */
1199 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1200 switch (dest_type) {
1201 case TIPC_NAMED_MSG:
1203 anc_data[0] = msg_nametype(msg);
1204 anc_data[1] = msg_namelower(msg);
1205 anc_data[2] = msg_namelower(msg);
1207 case TIPC_MCAST_MSG:
1209 anc_data[0] = msg_nametype(msg);
1210 anc_data[1] = msg_namelower(msg);
1211 anc_data[2] = msg_nameupper(msg);
1214 has_name = (tsk->conn_type != 0);
1215 anc_data[0] = tsk->conn_type;
1216 anc_data[1] = tsk->conn_instance;
1217 anc_data[2] = tsk->conn_instance;
1223 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1231 static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
1233 struct sk_buff *skb = NULL;
1234 struct tipc_msg *msg;
1235 u32 peer_port = tsk_peer_port(tsk);
1236 u32 dnode = tsk_peer_node(tsk);
1238 if (!tsk->connected)
1240 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode,
1241 tipc_own_addr, peer_port, tsk->ref, TIPC_OK);
1245 msg_set_msgcnt(msg, ack);
1246 tipc_link_xmit_skb(skb, dnode, msg_link_selector(msg));
1249 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1251 struct sock *sk = sock->sk;
1253 long timeo = *timeop;
1257 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1258 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1259 if (sock->state == SS_DISCONNECTING) {
1264 timeo = schedule_timeout(timeo);
1268 if (!skb_queue_empty(&sk->sk_receive_queue))
1270 err = sock_intr_errno(timeo);
1271 if (signal_pending(current))
1277 finish_wait(sk_sleep(sk), &wait);
1283 * tipc_recvmsg - receive packet-oriented message
1285 * @m: descriptor for message info
1286 * @buf_len: total size of user buffer area
1287 * @flags: receive flags
1289 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1290 * If the complete message doesn't fit in user area, truncate it.
1292 * Returns size of returned message data, errno otherwise
1294 static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
1295 struct msghdr *m, size_t buf_len, int flags)
1297 struct sock *sk = sock->sk;
1298 struct tipc_sock *tsk = tipc_sk(sk);
1299 struct sk_buff *buf;
1300 struct tipc_msg *msg;
1306 /* Catch invalid receive requests */
1307 if (unlikely(!buf_len))
1312 if (unlikely(sock->state == SS_UNCONNECTED)) {
1317 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1320 /* Look for a message in receive queue; wait if necessary */
1321 res = tipc_wait_for_rcvmsg(sock, &timeo);
1325 /* Look at first message in receive queue */
1326 buf = skb_peek(&sk->sk_receive_queue);
1328 sz = msg_data_sz(msg);
1329 err = msg_errcode(msg);
1331 /* Discard an empty non-errored message & try again */
1332 if ((!sz) && (!err)) {
1333 tsk_advance_rx_queue(sk);
1337 /* Capture sender's address (optional) */
1338 set_orig_addr(m, msg);
1340 /* Capture ancillary data (optional) */
1341 res = tipc_sk_anc_data_recv(m, msg, tsk);
1345 /* Capture message data (if valid) & compute return value (always) */
1347 if (unlikely(buf_len < sz)) {
1349 m->msg_flags |= MSG_TRUNC;
1351 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz);
1356 if ((sock->state == SS_READY) ||
1357 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1363 /* Consume received message (optional) */
1364 if (likely(!(flags & MSG_PEEK))) {
1365 if ((sock->state != SS_READY) &&
1366 (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1367 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1368 tsk->rcv_unacked = 0;
1370 tsk_advance_rx_queue(sk);
1378 * tipc_recv_stream - receive stream-oriented data
1380 * @m: descriptor for message info
1381 * @buf_len: total size of user buffer area
1382 * @flags: receive flags
1384 * Used for SOCK_STREAM messages only. If not enough data is available
1385 * will optionally wait for more; never truncates data.
1387 * Returns size of returned message data, errno otherwise
1389 static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
1390 struct msghdr *m, size_t buf_len, int flags)
1392 struct sock *sk = sock->sk;
1393 struct tipc_sock *tsk = tipc_sk(sk);
1394 struct sk_buff *buf;
1395 struct tipc_msg *msg;
1398 int sz_to_copy, target, needed;
1403 /* Catch invalid receive attempts */
1404 if (unlikely(!buf_len))
1409 if (unlikely(sock->state == SS_UNCONNECTED)) {
1414 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1415 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1418 /* Look for a message in receive queue; wait if necessary */
1419 res = tipc_wait_for_rcvmsg(sock, &timeo);
1423 /* Look at first message in receive queue */
1424 buf = skb_peek(&sk->sk_receive_queue);
1426 sz = msg_data_sz(msg);
1427 err = msg_errcode(msg);
1429 /* Discard an empty non-errored message & try again */
1430 if ((!sz) && (!err)) {
1431 tsk_advance_rx_queue(sk);
1435 /* Optionally capture sender's address & ancillary data of first msg */
1436 if (sz_copied == 0) {
1437 set_orig_addr(m, msg);
1438 res = tipc_sk_anc_data_recv(m, msg, tsk);
1443 /* Capture message data (if valid) & compute return value (always) */
1445 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1448 needed = (buf_len - sz_copied);
1449 sz_to_copy = (sz <= needed) ? sz : needed;
1451 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset,
1456 sz_copied += sz_to_copy;
1458 if (sz_to_copy < sz) {
1459 if (!(flags & MSG_PEEK))
1460 TIPC_SKB_CB(buf)->handle =
1461 (void *)(unsigned long)(offset + sz_to_copy);
1466 goto exit; /* can't add error msg to valid data */
1468 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1474 /* Consume received message (optional) */
1475 if (likely(!(flags & MSG_PEEK))) {
1476 if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1477 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1478 tsk->rcv_unacked = 0;
1480 tsk_advance_rx_queue(sk);
1483 /* Loop around if more data is required */
1484 if ((sz_copied < buf_len) && /* didn't get all requested data */
1485 (!skb_queue_empty(&sk->sk_receive_queue) ||
1486 (sz_copied < target)) && /* and more is ready or required */
1487 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1488 (!err)) /* and haven't reached a FIN */
1493 return sz_copied ? sz_copied : res;
1497 * tipc_write_space - wake up thread if port congestion is released
1500 static void tipc_write_space(struct sock *sk)
1502 struct socket_wq *wq;
1505 wq = rcu_dereference(sk->sk_wq);
1506 if (wq_has_sleeper(wq))
1507 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1508 POLLWRNORM | POLLWRBAND);
1513 * tipc_data_ready - wake up threads to indicate messages have been received
1515 * @len: the length of messages
1517 static void tipc_data_ready(struct sock *sk)
1519 struct socket_wq *wq;
1522 wq = rcu_dereference(sk->sk_wq);
1523 if (wq_has_sleeper(wq))
1524 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1525 POLLRDNORM | POLLRDBAND);
1530 * filter_connect - Handle all incoming messages for a connection-based socket
1534 * Returns 0 (TIPC_OK) if everything ok, -TIPC_ERR_NO_PORT otherwise
1536 static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
1538 struct sock *sk = &tsk->sk;
1539 struct socket *sock = sk->sk_socket;
1540 struct tipc_msg *msg = buf_msg(*buf);
1541 int retval = -TIPC_ERR_NO_PORT;
1546 switch ((int)sock->state) {
1548 /* Accept only connection-based messages sent by peer */
1549 if (tsk_peer_msg(tsk, msg)) {
1550 if (unlikely(msg_errcode(msg))) {
1551 sock->state = SS_DISCONNECTING;
1553 /* let timer expire on it's own */
1554 tipc_node_remove_conn(tsk_peer_node(tsk),
1561 /* Accept only ACK or NACK message */
1563 if (unlikely(!msg_connected(msg)))
1566 if (unlikely(msg_errcode(msg))) {
1567 sock->state = SS_DISCONNECTING;
1568 sk->sk_err = ECONNREFUSED;
1573 if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
1574 sock->state = SS_DISCONNECTING;
1575 sk->sk_err = EINVAL;
1580 tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg));
1581 msg_set_importance(&tsk->phdr, msg_importance(msg));
1582 sock->state = SS_CONNECTED;
1584 /* If an incoming message is an 'ACK-', it should be
1585 * discarded here because it doesn't contain useful
1586 * data. In addition, we should try to wake up
1587 * connect() routine if sleeping.
1589 if (msg_data_sz(msg) == 0) {
1592 if (waitqueue_active(sk_sleep(sk)))
1593 wake_up_interruptible(sk_sleep(sk));
1598 case SS_UNCONNECTED:
1599 /* Accept only SYN message */
1600 if (!msg_connected(msg) && !(msg_errcode(msg)))
1603 case SS_DISCONNECTING:
1606 pr_err("Unknown socket state %u\n", sock->state);
1612 * rcvbuf_limit - get proper overload limit of socket receive queue
1616 * For all connection oriented messages, irrespective of importance,
1617 * the default overload value (i.e. 67MB) is set as limit.
1619 * For all connectionless messages, by default new queue limits are
1622 * TIPC_LOW_IMPORTANCE (4 MB)
1623 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1624 * TIPC_HIGH_IMPORTANCE (16 MB)
1625 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1627 * Returns overload limit according to corresponding message importance
1629 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1631 struct tipc_msg *msg = buf_msg(buf);
1633 if (msg_connected(msg))
1634 return sysctl_tipc_rmem[2];
1636 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1637 msg_importance(msg);
1641 * filter_rcv - validate incoming message
1645 * Enqueues message on receive queue if acceptable; optionally handles
1646 * disconnect indication for a connected socket.
1648 * Called with socket lock already taken; port lock may also be taken.
1650 * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message
1651 * to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded
1653 static int filter_rcv(struct sock *sk, struct sk_buff *buf)
1655 struct socket *sock = sk->sk_socket;
1656 struct tipc_sock *tsk = tipc_sk(sk);
1657 struct tipc_msg *msg = buf_msg(buf);
1658 unsigned int limit = rcvbuf_limit(sk, buf);
1662 if (unlikely(msg_user(msg) == CONN_MANAGER))
1663 return tipc_sk_proto_rcv(tsk, &onode, buf);
1665 if (unlikely(msg_user(msg) == SOCK_WAKEUP)) {
1668 sk->sk_write_space(sk);
1672 /* Reject message if it is wrong sort of message for socket */
1673 if (msg_type(msg) > TIPC_DIRECT_MSG)
1674 return -TIPC_ERR_NO_PORT;
1676 if (sock->state == SS_READY) {
1677 if (msg_connected(msg))
1678 return -TIPC_ERR_NO_PORT;
1680 rc = filter_connect(tsk, &buf);
1681 if (rc != TIPC_OK || buf == NULL)
1685 /* Reject message if there isn't room to queue it */
1686 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1687 return -TIPC_ERR_OVERLOAD;
1689 /* Enqueue message */
1690 TIPC_SKB_CB(buf)->handle = NULL;
1691 __skb_queue_tail(&sk->sk_receive_queue, buf);
1692 skb_set_owner_r(buf, sk);
1694 sk->sk_data_ready(sk);
1699 * tipc_backlog_rcv - handle incoming message from backlog queue
1703 * Caller must hold socket lock, but not port lock.
1707 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
1711 struct tipc_sock *tsk = tipc_sk(sk);
1712 uint truesize = skb->truesize;
1714 rc = filter_rcv(sk, skb);
1717 if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT)
1718 atomic_add(truesize, &tsk->dupl_rcvcnt);
1722 if ((rc < 0) && !tipc_msg_reverse(skb, &onode, -rc))
1725 tipc_link_xmit_skb(skb, onode, 0);
1731 * tipc_sk_rcv - handle incoming message
1732 * @skb: buffer containing arriving message
1734 * Returns 0 if success, or errno: -EHOSTUNREACH
1736 int tipc_sk_rcv(struct sk_buff *skb)
1738 struct tipc_sock *tsk;
1740 u32 dport = msg_destport(buf_msg(skb));
1745 /* Validate destination and message */
1746 tsk = tipc_sk_get(dport);
1747 if (unlikely(!tsk)) {
1748 rc = tipc_msg_eval(skb, &dnode);
1754 spin_lock_bh(&sk->sk_lock.slock);
1756 if (!sock_owned_by_user(sk)) {
1757 rc = filter_rcv(sk, skb);
1759 if (sk->sk_backlog.len == 0)
1760 atomic_set(&tsk->dupl_rcvcnt, 0);
1761 limit = rcvbuf_limit(sk, skb) + atomic_read(&tsk->dupl_rcvcnt);
1762 if (sk_add_backlog(sk, skb, limit))
1763 rc = -TIPC_ERR_OVERLOAD;
1765 spin_unlock_bh(&sk->sk_lock.slock);
1770 if ((rc < 0) && !tipc_msg_reverse(skb, &dnode, -rc))
1771 return -EHOSTUNREACH;
1773 tipc_link_xmit_skb(skb, dnode, 0);
1774 return (rc < 0) ? -EHOSTUNREACH : 0;
1777 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1779 struct sock *sk = sock->sk;
1784 int err = sock_error(sk);
1789 if (signal_pending(current))
1790 return sock_intr_errno(*timeo_p);
1792 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1793 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1794 finish_wait(sk_sleep(sk), &wait);
1800 * tipc_connect - establish a connection to another TIPC port
1801 * @sock: socket structure
1802 * @dest: socket address for destination port
1803 * @destlen: size of socket address data structure
1804 * @flags: file-related flags associated with socket
1806 * Returns 0 on success, errno otherwise
1808 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1809 int destlen, int flags)
1811 struct sock *sk = sock->sk;
1812 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1813 struct msghdr m = {NULL,};
1814 long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1815 socket_state previous;
1820 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1821 if (sock->state == SS_READY) {
1827 * Reject connection attempt using multicast address
1829 * Note: send_msg() validates the rest of the address fields,
1830 * so there's no need to do it here
1832 if (dst->addrtype == TIPC_ADDR_MCAST) {
1837 previous = sock->state;
1838 switch (sock->state) {
1839 case SS_UNCONNECTED:
1840 /* Send a 'SYN-' to destination */
1842 m.msg_namelen = destlen;
1844 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1845 * indicate send_msg() is never blocked.
1848 m.msg_flags = MSG_DONTWAIT;
1850 res = tipc_sendmsg(NULL, sock, &m, 0);
1851 if ((res < 0) && (res != -EWOULDBLOCK))
1854 /* Just entered SS_CONNECTING state; the only
1855 * difference is that return value in non-blocking
1856 * case is EINPROGRESS, rather than EALREADY.
1860 if (previous == SS_CONNECTING)
1864 timeout = msecs_to_jiffies(timeout);
1865 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1866 res = tipc_wait_for_connect(sock, &timeout);
1881 * tipc_listen - allow socket to listen for incoming connections
1882 * @sock: socket structure
1885 * Returns 0 on success, errno otherwise
1887 static int tipc_listen(struct socket *sock, int len)
1889 struct sock *sk = sock->sk;
1894 if (sock->state != SS_UNCONNECTED)
1897 sock->state = SS_LISTENING;
1905 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1907 struct sock *sk = sock->sk;
1911 /* True wake-one mechanism for incoming connections: only
1912 * one process gets woken up, not the 'whole herd'.
1913 * Since we do not 'race & poll' for established sockets
1914 * anymore, the common case will execute the loop only once.
1917 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1918 TASK_INTERRUPTIBLE);
1919 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1921 timeo = schedule_timeout(timeo);
1925 if (!skb_queue_empty(&sk->sk_receive_queue))
1928 if (sock->state != SS_LISTENING)
1930 err = sock_intr_errno(timeo);
1931 if (signal_pending(current))
1937 finish_wait(sk_sleep(sk), &wait);
1942 * tipc_accept - wait for connection request
1943 * @sock: listening socket
1944 * @newsock: new socket that is to be connected
1945 * @flags: file-related flags associated with socket
1947 * Returns 0 on success, errno otherwise
1949 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1951 struct sock *new_sk, *sk = sock->sk;
1952 struct sk_buff *buf;
1953 struct tipc_sock *new_tsock;
1954 struct tipc_msg *msg;
1960 if (sock->state != SS_LISTENING) {
1964 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1965 res = tipc_wait_for_accept(sock, timeo);
1969 buf = skb_peek(&sk->sk_receive_queue);
1971 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
1975 new_sk = new_sock->sk;
1976 new_tsock = tipc_sk(new_sk);
1979 /* we lock on new_sk; but lockdep sees the lock on sk */
1980 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
1983 * Reject any stray messages received by new socket
1984 * before the socket lock was taken (very, very unlikely)
1986 tsk_rej_rx_queue(new_sk);
1988 /* Connect new socket to it's peer */
1989 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
1990 new_sock->state = SS_CONNECTED;
1992 tsk_set_importance(new_tsock, msg_importance(msg));
1993 if (msg_named(msg)) {
1994 new_tsock->conn_type = msg_nametype(msg);
1995 new_tsock->conn_instance = msg_nameinst(msg);
1999 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2000 * Respond to 'SYN+' by queuing it on new socket.
2002 if (!msg_data_sz(msg)) {
2003 struct msghdr m = {NULL,};
2005 tsk_advance_rx_queue(sk);
2006 tipc_send_packet(NULL, new_sock, &m, 0);
2008 __skb_dequeue(&sk->sk_receive_queue);
2009 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2010 skb_set_owner_r(buf, new_sk);
2012 release_sock(new_sk);
2019 * tipc_shutdown - shutdown socket connection
2020 * @sock: socket structure
2021 * @how: direction to close (must be SHUT_RDWR)
2023 * Terminates connection (if necessary), then purges socket's receive queue.
2025 * Returns 0 on success, errno otherwise
2027 static int tipc_shutdown(struct socket *sock, int how)
2029 struct sock *sk = sock->sk;
2030 struct tipc_sock *tsk = tipc_sk(sk);
2031 struct sk_buff *skb;
2035 if (how != SHUT_RDWR)
2040 switch (sock->state) {
2045 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
2046 skb = __skb_dequeue(&sk->sk_receive_queue);
2048 if (TIPC_SKB_CB(skb)->handle != NULL) {
2052 if (tipc_msg_reverse(skb, &dnode, TIPC_CONN_SHUTDOWN))
2053 tipc_link_xmit_skb(skb, dnode, tsk->ref);
2054 tipc_node_remove_conn(dnode, tsk->ref);
2056 dnode = tsk_peer_node(tsk);
2057 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2058 TIPC_CONN_MSG, SHORT_H_SIZE,
2059 0, dnode, tipc_own_addr,
2061 tsk->ref, TIPC_CONN_SHUTDOWN);
2062 tipc_link_xmit_skb(skb, dnode, tsk->ref);
2065 sock->state = SS_DISCONNECTING;
2066 tipc_node_remove_conn(dnode, tsk->ref);
2069 case SS_DISCONNECTING:
2071 /* Discard any unreceived messages */
2072 __skb_queue_purge(&sk->sk_receive_queue);
2074 /* Wake up anyone sleeping in poll */
2075 sk->sk_state_change(sk);
2087 static void tipc_sk_timeout(unsigned long ref)
2089 struct tipc_sock *tsk;
2091 struct sk_buff *skb = NULL;
2092 u32 peer_port, peer_node;
2094 tsk = tipc_sk_get(ref);
2100 if (!tsk->connected) {
2104 peer_port = tsk_peer_port(tsk);
2105 peer_node = tsk_peer_node(tsk);
2107 if (tsk->probing_state == TIPC_CONN_PROBING) {
2108 /* Previous probe not answered -> self abort */
2109 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
2110 SHORT_H_SIZE, 0, tipc_own_addr,
2111 peer_node, ref, peer_port,
2114 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE,
2115 0, peer_node, tipc_own_addr,
2116 peer_port, ref, TIPC_OK);
2117 tsk->probing_state = TIPC_CONN_PROBING;
2118 k_start_timer(&tsk->timer, tsk->probing_interval);
2122 tipc_link_xmit_skb(skb, peer_node, ref);
2127 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2128 struct tipc_name_seq const *seq)
2130 struct publication *publ;
2135 key = tsk->ref + tsk->pub_count + 1;
2136 if (key == tsk->ref)
2139 publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
2140 scope, tsk->ref, key);
2141 if (unlikely(!publ))
2144 list_add(&publ->pport_list, &tsk->publications);
2150 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2151 struct tipc_name_seq const *seq)
2153 struct publication *publ;
2154 struct publication *safe;
2157 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2159 if (publ->scope != scope)
2161 if (publ->type != seq->type)
2163 if (publ->lower != seq->lower)
2165 if (publ->upper != seq->upper)
2167 tipc_nametbl_withdraw(publ->type, publ->lower,
2168 publ->ref, publ->key);
2172 tipc_nametbl_withdraw(publ->type, publ->lower,
2173 publ->ref, publ->key);
2176 if (list_empty(&tsk->publications))
2181 static int tipc_sk_show(struct tipc_sock *tsk, char *buf,
2182 int len, int full_id)
2184 struct publication *publ;
2188 ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
2189 tipc_zone(tipc_own_addr),
2190 tipc_cluster(tipc_own_addr),
2191 tipc_node(tipc_own_addr), tsk->ref);
2193 ret = tipc_snprintf(buf, len, "%-10u:", tsk->ref);
2195 if (tsk->connected) {
2196 u32 dport = tsk_peer_port(tsk);
2197 u32 destnode = tsk_peer_node(tsk);
2199 ret += tipc_snprintf(buf + ret, len - ret,
2200 " connected to <%u.%u.%u:%u>",
2201 tipc_zone(destnode),
2202 tipc_cluster(destnode),
2203 tipc_node(destnode), dport);
2204 if (tsk->conn_type != 0)
2205 ret += tipc_snprintf(buf + ret, len - ret,
2206 " via {%u,%u}", tsk->conn_type,
2207 tsk->conn_instance);
2208 } else if (tsk->published) {
2209 ret += tipc_snprintf(buf + ret, len - ret, " bound to");
2210 list_for_each_entry(publ, &tsk->publications, pport_list) {
2211 if (publ->lower == publ->upper)
2212 ret += tipc_snprintf(buf + ret, len - ret,
2213 " {%u,%u}", publ->type,
2216 ret += tipc_snprintf(buf + ret, len - ret,
2217 " {%u,%u,%u}", publ->type,
2218 publ->lower, publ->upper);
2221 ret += tipc_snprintf(buf + ret, len - ret, "\n");
2225 struct sk_buff *tipc_sk_socks_show(void)
2227 struct sk_buff *buf;
2228 struct tlv_desc *rep_tlv;
2231 struct tipc_sock *tsk;
2235 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
2238 rep_tlv = (struct tlv_desc *)buf->data;
2239 pb = TLV_DATA(rep_tlv);
2240 pb_len = ULTRA_STRING_MAX_LEN;
2242 tsk = tipc_sk_get_next(&ref);
2243 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2244 lock_sock(&tsk->sk);
2245 str_len += tipc_sk_show(tsk, pb + str_len,
2246 pb_len - str_len, 0);
2247 release_sock(&tsk->sk);
2250 str_len += 1; /* for "\0" */
2251 skb_put(buf, TLV_SPACE(str_len));
2252 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
2257 /* tipc_sk_reinit: set non-zero address in all existing sockets
2258 * when we go from standalone to network mode.
2260 void tipc_sk_reinit(void)
2262 struct tipc_msg *msg;
2264 struct tipc_sock *tsk = tipc_sk_get_next(&ref);
2266 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2267 lock_sock(&tsk->sk);
2269 msg_set_prevnode(msg, tipc_own_addr);
2270 msg_set_orignode(msg, tipc_own_addr);
2271 release_sock(&tsk->sk);
2277 * struct reference - TIPC socket reference entry
2278 * @tsk: pointer to socket associated with reference entry
2279 * @ref: reference value for socket (combines instance & array index info)
2282 struct tipc_sock *tsk;
2287 * struct tipc_ref_table - table of TIPC socket reference entries
2288 * @entries: pointer to array of reference entries
2289 * @capacity: array index of first unusable entry
2290 * @init_point: array index of first uninitialized entry
2291 * @first_free: array index of first unused socket reference entry
2292 * @last_free: array index of last unused socket reference entry
2293 * @index_mask: bitmask for array index portion of reference values
2294 * @start_mask: initial value for instance value portion of reference values
2297 struct reference *entries;
2306 /* Socket reference table consists of 2**N entries.
2308 * State Socket ptr Reference
2309 * ----- ---------- ---------
2310 * In use non-NULL XXXX|own index
2311 * (XXXX changes each time entry is acquired)
2312 * Free NULL YYYY|next free index
2313 * (YYYY is one more than last used XXXX)
2314 * Uninitialized NULL 0
2316 * Entry 0 is not used; this allows index 0 to denote the end of the free list.
2318 * Note that a reference value of 0 does not necessarily indicate that an
2319 * entry is uninitialized, since the last entry in the free list could also
2320 * have a reference value of 0 (although this is unlikely).
2323 static struct ref_table tipc_ref_table;
2325 static DEFINE_RWLOCK(ref_table_lock);
2328 * tipc_ref_table_init - create reference table for sockets
2330 int tipc_sk_ref_table_init(u32 req_sz, u32 start)
2332 struct reference *table;
2335 /* account for unused entry, then round up size to a power of 2 */
2338 for (actual_sz = 16; actual_sz < req_sz; actual_sz <<= 1) {
2342 /* allocate table & mark all entries as uninitialized */
2343 table = vzalloc(actual_sz * sizeof(struct reference));
2347 tipc_ref_table.entries = table;
2348 tipc_ref_table.capacity = req_sz;
2349 tipc_ref_table.init_point = 1;
2350 tipc_ref_table.first_free = 0;
2351 tipc_ref_table.last_free = 0;
2352 tipc_ref_table.index_mask = actual_sz - 1;
2353 tipc_ref_table.start_mask = start & ~tipc_ref_table.index_mask;
2359 * tipc_ref_table_stop - destroy reference table for sockets
2361 void tipc_sk_ref_table_stop(void)
2363 if (!tipc_ref_table.entries)
2365 vfree(tipc_ref_table.entries);
2366 tipc_ref_table.entries = NULL;
2369 /* tipc_ref_acquire - create reference to a socket
2371 * Register an socket pointer in the reference table.
2372 * Returns a unique reference value that is used from then on to retrieve the
2373 * socket pointer, or to determine if the socket has been deregistered.
2375 u32 tipc_sk_ref_acquire(struct tipc_sock *tsk)
2379 u32 next_plus_upper;
2381 struct reference *entry;
2383 if (unlikely(!tsk)) {
2384 pr_err("Attempt to acquire ref. to non-existent obj\n");
2387 if (unlikely(!tipc_ref_table.entries)) {
2388 pr_err("Ref. table not found in acquisition attempt\n");
2392 /* Take a free entry, if available; otherwise initialize a new one */
2393 write_lock_bh(&ref_table_lock);
2394 index = tipc_ref_table.first_free;
2395 entry = &tipc_ref_table.entries[index];
2397 if (likely(index)) {
2398 index = tipc_ref_table.first_free;
2399 entry = &tipc_ref_table.entries[index];
2400 index_mask = tipc_ref_table.index_mask;
2401 next_plus_upper = entry->ref;
2402 tipc_ref_table.first_free = next_plus_upper & index_mask;
2403 ref = (next_plus_upper & ~index_mask) + index;
2405 } else if (tipc_ref_table.init_point < tipc_ref_table.capacity) {
2406 index = tipc_ref_table.init_point++;
2407 entry = &tipc_ref_table.entries[index];
2408 ref = tipc_ref_table.start_mask + index;
2415 write_unlock_bh(&ref_table_lock);
2419 /* tipc_sk_ref_discard - invalidate reference to an socket
2421 * Disallow future references to an socket and free up the entry for re-use.
2423 void tipc_sk_ref_discard(u32 ref)
2425 struct reference *entry;
2429 if (unlikely(!tipc_ref_table.entries)) {
2430 pr_err("Ref. table not found during discard attempt\n");
2434 index_mask = tipc_ref_table.index_mask;
2435 index = ref & index_mask;
2436 entry = &tipc_ref_table.entries[index];
2438 write_lock_bh(&ref_table_lock);
2440 if (unlikely(!entry->tsk)) {
2441 pr_err("Attempt to discard ref. to non-existent socket\n");
2444 if (unlikely(entry->ref != ref)) {
2445 pr_err("Attempt to discard non-existent reference\n");
2449 /* Mark entry as unused; increment instance part of entry's
2450 * reference to invalidate any subsequent references
2454 entry->ref = (ref & ~index_mask) + (index_mask + 1);
2456 /* Append entry to free entry list */
2457 if (unlikely(tipc_ref_table.first_free == 0))
2458 tipc_ref_table.first_free = index;
2460 tipc_ref_table.entries[tipc_ref_table.last_free].ref |= index;
2461 tipc_ref_table.last_free = index;
2463 write_unlock_bh(&ref_table_lock);
2466 /* tipc_sk_get - find referenced socket and return pointer to it
2468 struct tipc_sock *tipc_sk_get(u32 ref)
2470 struct reference *entry;
2471 struct tipc_sock *tsk;
2473 if (unlikely(!tipc_ref_table.entries))
2475 read_lock_bh(&ref_table_lock);
2476 entry = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
2478 if (likely(tsk && (entry->ref == ref)))
2479 sock_hold(&tsk->sk);
2482 read_unlock_bh(&ref_table_lock);
2486 /* tipc_sk_get_next - lock & return next socket after referenced one
2488 struct tipc_sock *tipc_sk_get_next(u32 *ref)
2490 struct reference *entry;
2491 struct tipc_sock *tsk = NULL;
2492 uint index = *ref & tipc_ref_table.index_mask;
2494 read_lock_bh(&ref_table_lock);
2495 while (++index < tipc_ref_table.capacity) {
2496 entry = &tipc_ref_table.entries[index];
2500 sock_hold(&tsk->sk);
2504 read_unlock_bh(&ref_table_lock);
2508 static void tipc_sk_put(struct tipc_sock *tsk)
2514 * tipc_setsockopt - set socket option
2515 * @sock: socket structure
2516 * @lvl: option level
2517 * @opt: option identifier
2518 * @ov: pointer to new option value
2519 * @ol: length of option value
2521 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2522 * (to ease compatibility).
2524 * Returns 0 on success, errno otherwise
2526 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2527 char __user *ov, unsigned int ol)
2529 struct sock *sk = sock->sk;
2530 struct tipc_sock *tsk = tipc_sk(sk);
2534 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2536 if (lvl != SOL_TIPC)
2537 return -ENOPROTOOPT;
2538 if (ol < sizeof(value))
2540 res = get_user(value, (u32 __user *)ov);
2547 case TIPC_IMPORTANCE:
2548 res = tsk_set_importance(tsk, value);
2550 case TIPC_SRC_DROPPABLE:
2551 if (sock->type != SOCK_STREAM)
2552 tsk_set_unreliable(tsk, value);
2556 case TIPC_DEST_DROPPABLE:
2557 tsk_set_unreturnable(tsk, value);
2559 case TIPC_CONN_TIMEOUT:
2560 tipc_sk(sk)->conn_timeout = value;
2561 /* no need to set "res", since already 0 at this point */
2573 * tipc_getsockopt - get socket option
2574 * @sock: socket structure
2575 * @lvl: option level
2576 * @opt: option identifier
2577 * @ov: receptacle for option value
2578 * @ol: receptacle for length of option value
2580 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2581 * (to ease compatibility).
2583 * Returns 0 on success, errno otherwise
2585 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2586 char __user *ov, int __user *ol)
2588 struct sock *sk = sock->sk;
2589 struct tipc_sock *tsk = tipc_sk(sk);
2594 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2595 return put_user(0, ol);
2596 if (lvl != SOL_TIPC)
2597 return -ENOPROTOOPT;
2598 res = get_user(len, ol);
2605 case TIPC_IMPORTANCE:
2606 value = tsk_importance(tsk);
2608 case TIPC_SRC_DROPPABLE:
2609 value = tsk_unreliable(tsk);
2611 case TIPC_DEST_DROPPABLE:
2612 value = tsk_unreturnable(tsk);
2614 case TIPC_CONN_TIMEOUT:
2615 value = tsk->conn_timeout;
2616 /* no need to set "res", since already 0 at this point */
2618 case TIPC_NODE_RECVQ_DEPTH:
2619 value = 0; /* was tipc_queue_size, now obsolete */
2621 case TIPC_SOCK_RECVQ_DEPTH:
2622 value = skb_queue_len(&sk->sk_receive_queue);
2631 return res; /* "get" failed */
2633 if (len < sizeof(value))
2636 if (copy_to_user(ov, &value, sizeof(value)))
2639 return put_user(sizeof(value), ol);
2642 static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg)
2644 struct tipc_sioc_ln_req lnr;
2645 void __user *argp = (void __user *)arg;
2648 case SIOCGETLINKNAME:
2649 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2651 if (!tipc_node_get_linkname(lnr.bearer_id & 0xffff, lnr.peer,
2652 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2653 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2657 return -EADDRNOTAVAIL;
2659 return -ENOIOCTLCMD;
2663 /* Protocol switches for the various types of TIPC sockets */
2665 static const struct proto_ops msg_ops = {
2666 .owner = THIS_MODULE,
2668 .release = tipc_release,
2670 .connect = tipc_connect,
2671 .socketpair = sock_no_socketpair,
2672 .accept = sock_no_accept,
2673 .getname = tipc_getname,
2675 .ioctl = tipc_ioctl,
2676 .listen = sock_no_listen,
2677 .shutdown = tipc_shutdown,
2678 .setsockopt = tipc_setsockopt,
2679 .getsockopt = tipc_getsockopt,
2680 .sendmsg = tipc_sendmsg,
2681 .recvmsg = tipc_recvmsg,
2682 .mmap = sock_no_mmap,
2683 .sendpage = sock_no_sendpage
2686 static const struct proto_ops packet_ops = {
2687 .owner = THIS_MODULE,
2689 .release = tipc_release,
2691 .connect = tipc_connect,
2692 .socketpair = sock_no_socketpair,
2693 .accept = tipc_accept,
2694 .getname = tipc_getname,
2696 .ioctl = tipc_ioctl,
2697 .listen = tipc_listen,
2698 .shutdown = tipc_shutdown,
2699 .setsockopt = tipc_setsockopt,
2700 .getsockopt = tipc_getsockopt,
2701 .sendmsg = tipc_send_packet,
2702 .recvmsg = tipc_recvmsg,
2703 .mmap = sock_no_mmap,
2704 .sendpage = sock_no_sendpage
2707 static const struct proto_ops stream_ops = {
2708 .owner = THIS_MODULE,
2710 .release = tipc_release,
2712 .connect = tipc_connect,
2713 .socketpair = sock_no_socketpair,
2714 .accept = tipc_accept,
2715 .getname = tipc_getname,
2717 .ioctl = tipc_ioctl,
2718 .listen = tipc_listen,
2719 .shutdown = tipc_shutdown,
2720 .setsockopt = tipc_setsockopt,
2721 .getsockopt = tipc_getsockopt,
2722 .sendmsg = tipc_send_stream,
2723 .recvmsg = tipc_recv_stream,
2724 .mmap = sock_no_mmap,
2725 .sendpage = sock_no_sendpage
2728 static const struct net_proto_family tipc_family_ops = {
2729 .owner = THIS_MODULE,
2731 .create = tipc_sk_create
2734 static struct proto tipc_proto = {
2736 .owner = THIS_MODULE,
2737 .obj_size = sizeof(struct tipc_sock),
2738 .sysctl_rmem = sysctl_tipc_rmem
2741 static struct proto tipc_proto_kern = {
2743 .obj_size = sizeof(struct tipc_sock),
2744 .sysctl_rmem = sysctl_tipc_rmem
2748 * tipc_socket_init - initialize TIPC socket interface
2750 * Returns 0 on success, errno otherwise
2752 int tipc_socket_init(void)
2756 res = proto_register(&tipc_proto, 1);
2758 pr_err("Failed to register TIPC protocol type\n");
2762 res = sock_register(&tipc_family_ops);
2764 pr_err("Failed to register TIPC socket type\n");
2765 proto_unregister(&tipc_proto);
2773 * tipc_socket_stop - stop TIPC socket interface
2775 void tipc_socket_stop(void)
2777 sock_unregister(tipc_family_ops.family);
2778 proto_unregister(&tipc_proto);
2781 /* Caller should hold socket lock for the passed tipc socket. */
2782 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
2786 struct nlattr *nest;
2788 peer_node = tsk_peer_node(tsk);
2789 peer_port = tsk_peer_port(tsk);
2791 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
2793 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
2795 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
2798 if (tsk->conn_type != 0) {
2799 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
2801 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
2803 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
2806 nla_nest_end(skb, nest);
2811 nla_nest_cancel(skb, nest);
2816 /* Caller should hold socket lock for the passed tipc socket. */
2817 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
2818 struct tipc_sock *tsk)
2822 struct nlattr *attrs;
2824 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2825 &tipc_genl_v2_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
2829 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
2831 goto genlmsg_cancel;
2832 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->ref))
2833 goto attr_msg_cancel;
2834 if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr))
2835 goto attr_msg_cancel;
2837 if (tsk->connected) {
2838 err = __tipc_nl_add_sk_con(skb, tsk);
2840 goto attr_msg_cancel;
2841 } else if (!list_empty(&tsk->publications)) {
2842 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
2843 goto attr_msg_cancel;
2845 nla_nest_end(skb, attrs);
2846 genlmsg_end(skb, hdr);
2851 nla_nest_cancel(skb, attrs);
2853 genlmsg_cancel(skb, hdr);
2858 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
2861 struct tipc_sock *tsk;
2862 u32 prev_ref = cb->args[0];
2865 tsk = tipc_sk_get_next(&ref);
2866 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2867 lock_sock(&tsk->sk);
2868 err = __tipc_nl_add_sk(skb, cb, tsk);
2869 release_sock(&tsk->sk);
2877 cb->args[0] = prev_ref;
2882 /* Caller should hold socket lock for the passed tipc socket. */
2883 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
2884 struct netlink_callback *cb,
2885 struct publication *publ)
2888 struct nlattr *attrs;
2890 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2891 &tipc_genl_v2_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
2895 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
2897 goto genlmsg_cancel;
2899 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
2900 goto attr_msg_cancel;
2901 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
2902 goto attr_msg_cancel;
2903 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
2904 goto attr_msg_cancel;
2905 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
2906 goto attr_msg_cancel;
2908 nla_nest_end(skb, attrs);
2909 genlmsg_end(skb, hdr);
2914 nla_nest_cancel(skb, attrs);
2916 genlmsg_cancel(skb, hdr);
2921 /* Caller should hold socket lock for the passed tipc socket. */
2922 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
2923 struct netlink_callback *cb,
2924 struct tipc_sock *tsk, u32 *last_publ)
2927 struct publication *p;
2930 list_for_each_entry(p, &tsk->publications, pport_list) {
2931 if (p->key == *last_publ)
2934 if (p->key != *last_publ) {
2935 /* We never set seq or call nl_dump_check_consistent()
2936 * this means that setting prev_seq here will cause the
2937 * consistence check to fail in the netlink callback
2938 * handler. Resulting in the last NLMSG_DONE message
2939 * having the NLM_F_DUMP_INTR flag set.
2946 p = list_first_entry(&tsk->publications, struct publication,
2950 list_for_each_entry_from(p, &tsk->publications, pport_list) {
2951 err = __tipc_nl_add_sk_publ(skb, cb, p);
2953 *last_publ = p->key;
2962 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
2965 u32 tsk_ref = cb->args[0];
2966 u32 last_publ = cb->args[1];
2967 u32 done = cb->args[2];
2968 struct tipc_sock *tsk;
2971 struct nlattr **attrs;
2972 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
2974 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2978 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
2979 attrs[TIPC_NLA_SOCK],
2980 tipc_nl_sock_policy);
2984 if (!sock[TIPC_NLA_SOCK_REF])
2987 tsk_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
2993 tsk = tipc_sk_get(tsk_ref);
2997 lock_sock(&tsk->sk);
2998 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3001 release_sock(&tsk->sk);
3004 cb->args[0] = tsk_ref;
3005 cb->args[1] = last_publ;