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 */
831 * dest_name_check - verify user is permitted to send to specified port name
832 * @dest: destination address
833 * @m: descriptor for message to be sent
835 * Prevents restricted configuration commands from being issued by
836 * unauthorized users.
838 * Returns 0 if permission is granted, otherwise errno
840 static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
842 struct tipc_cfg_msg_hdr hdr;
844 if (unlikely(dest->addrtype == TIPC_ADDR_ID))
846 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
848 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
850 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
853 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
855 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
857 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
863 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
865 struct sock *sk = sock->sk;
866 struct tipc_sock *tsk = tipc_sk(sk);
871 int err = sock_error(sk);
874 if (sock->state == SS_DISCONNECTING)
878 if (signal_pending(current))
879 return sock_intr_errno(*timeo_p);
881 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
882 done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
883 finish_wait(sk_sleep(sk), &wait);
889 * tipc_sendmsg - send message in connectionless manner
890 * @iocb: if NULL, indicates that socket lock is already held
891 * @sock: socket structure
892 * @m: message to send
893 * @dsz: amount of user data to be sent
895 * Message must have an destination specified explicitly.
896 * Used for SOCK_RDM and SOCK_DGRAM messages,
897 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
898 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
900 * Returns the number of bytes sent on success, or errno otherwise
902 static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
903 struct msghdr *m, size_t dsz)
905 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
906 struct sock *sk = sock->sk;
907 struct tipc_sock *tsk = tipc_sk(sk);
908 struct tipc_msg *mhdr = &tsk->phdr;
910 struct sk_buff_head head;
912 struct tipc_name_seq *seq = &dest->addr.nameseq;
918 return -EDESTADDRREQ;
920 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
921 (dest->family != AF_TIPC)))
924 if (dsz > TIPC_MAX_USER_MSG_SIZE)
930 if (unlikely(sock->state != SS_READY)) {
931 if (sock->state == SS_LISTENING) {
935 if (sock->state != SS_UNCONNECTED) {
939 if (tsk->published) {
943 if (dest->addrtype == TIPC_ADDR_NAME) {
944 tsk->conn_type = dest->addr.name.name.type;
945 tsk->conn_instance = dest->addr.name.name.instance;
948 rc = dest_name_check(dest, m);
952 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
954 if (dest->addrtype == TIPC_ADDR_MCAST) {
955 rc = tipc_sendmcast(sock, seq, m, dsz, timeo);
957 } else if (dest->addrtype == TIPC_ADDR_NAME) {
958 u32 type = dest->addr.name.name.type;
959 u32 inst = dest->addr.name.name.instance;
960 u32 domain = dest->addr.name.domain;
963 msg_set_type(mhdr, TIPC_NAMED_MSG);
964 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
965 msg_set_nametype(mhdr, type);
966 msg_set_nameinst(mhdr, inst);
967 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
968 dport = tipc_nametbl_translate(type, inst, &dnode);
969 msg_set_destnode(mhdr, dnode);
970 msg_set_destport(mhdr, dport);
971 if (unlikely(!dport && !dnode)) {
975 } else if (dest->addrtype == TIPC_ADDR_ID) {
976 dnode = dest->addr.id.node;
977 msg_set_type(mhdr, TIPC_DIRECT_MSG);
978 msg_set_lookup_scope(mhdr, 0);
979 msg_set_destnode(mhdr, dnode);
980 msg_set_destport(mhdr, dest->addr.id.ref);
981 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
985 mtu = tipc_node_get_mtu(dnode, tsk->ref);
986 __skb_queue_head_init(&head);
987 rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, &head);
992 skb = skb_peek(&head);
993 TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong;
994 rc = tipc_link_xmit(&head, dnode, tsk->ref);
995 if (likely(rc >= 0)) {
996 if (sock->state != SS_READY)
997 sock->state = SS_CONNECTING;
1001 if (rc == -EMSGSIZE)
1003 if (rc != -ELINKCONG)
1006 rc = tipc_wait_for_sndmsg(sock, &timeo);
1008 __skb_queue_purge(&head);
1017 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
1019 struct sock *sk = sock->sk;
1020 struct tipc_sock *tsk = tipc_sk(sk);
1025 int err = sock_error(sk);
1028 if (sock->state == SS_DISCONNECTING)
1030 else if (sock->state != SS_CONNECTED)
1034 if (signal_pending(current))
1035 return sock_intr_errno(*timeo_p);
1037 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1038 done = sk_wait_event(sk, timeo_p,
1040 !tsk_conn_cong(tsk)) ||
1042 finish_wait(sk_sleep(sk), &wait);
1048 * tipc_send_stream - send stream-oriented data
1050 * @sock: socket structure
1052 * @dsz: total length of data to be transmitted
1054 * Used for SOCK_STREAM data.
1056 * Returns the number of bytes sent on success (or partial success),
1057 * or errno if no data sent
1059 static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
1060 struct msghdr *m, size_t dsz)
1062 struct sock *sk = sock->sk;
1063 struct tipc_sock *tsk = tipc_sk(sk);
1064 struct tipc_msg *mhdr = &tsk->phdr;
1065 struct sk_buff_head head;
1066 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1071 uint mtu, send, sent = 0;
1073 /* Handle implied connection establishment */
1074 if (unlikely(dest)) {
1075 rc = tipc_sendmsg(iocb, sock, m, dsz);
1076 if (dsz && (dsz == rc))
1077 tsk->sent_unacked = 1;
1080 if (dsz > (uint)INT_MAX)
1086 if (unlikely(sock->state != SS_CONNECTED)) {
1087 if (sock->state == SS_DISCONNECTING)
1094 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1095 dnode = tsk_peer_node(tsk);
1099 send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
1100 __skb_queue_head_init(&head);
1101 rc = tipc_msg_build(mhdr, m, sent, send, mtu, &head);
1102 if (unlikely(rc < 0))
1105 if (likely(!tsk_conn_cong(tsk))) {
1106 rc = tipc_link_xmit(&head, dnode, ref);
1108 tsk->sent_unacked++;
1114 if (rc == -EMSGSIZE) {
1115 tsk->max_pkt = tipc_node_get_mtu(dnode, ref);
1118 if (rc != -ELINKCONG)
1122 rc = tipc_wait_for_sndpkt(sock, &timeo);
1124 __skb_queue_purge(&head);
1129 return sent ? sent : rc;
1133 * tipc_send_packet - send a connection-oriented message
1134 * @iocb: if NULL, indicates that socket lock is already held
1135 * @sock: socket structure
1136 * @m: message to send
1137 * @dsz: length of data to be transmitted
1139 * Used for SOCK_SEQPACKET messages.
1141 * Returns the number of bytes sent on success, or errno otherwise
1143 static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
1144 struct msghdr *m, size_t dsz)
1146 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1149 return tipc_send_stream(iocb, sock, m, dsz);
1152 /* tipc_sk_finish_conn - complete the setup of a connection
1154 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1157 struct tipc_msg *msg = &tsk->phdr;
1159 msg_set_destnode(msg, peer_node);
1160 msg_set_destport(msg, peer_port);
1161 msg_set_type(msg, TIPC_CONN_MSG);
1162 msg_set_lookup_scope(msg, 0);
1163 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1165 tsk->probing_interval = CONN_PROBING_INTERVAL;
1166 tsk->probing_state = TIPC_CONN_OK;
1168 k_start_timer(&tsk->timer, tsk->probing_interval);
1169 tipc_node_add_conn(peer_node, tsk->ref, peer_port);
1170 tsk->max_pkt = tipc_node_get_mtu(peer_node, tsk->ref);
1174 * set_orig_addr - capture sender's address for received message
1175 * @m: descriptor for message info
1176 * @msg: received message header
1178 * Note: Address is not captured if not requested by receiver.
1180 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
1182 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
1185 addr->family = AF_TIPC;
1186 addr->addrtype = TIPC_ADDR_ID;
1187 memset(&addr->addr, 0, sizeof(addr->addr));
1188 addr->addr.id.ref = msg_origport(msg);
1189 addr->addr.id.node = msg_orignode(msg);
1190 addr->addr.name.domain = 0; /* could leave uninitialized */
1191 addr->scope = 0; /* could leave uninitialized */
1192 m->msg_namelen = sizeof(struct sockaddr_tipc);
1197 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1198 * @m: descriptor for message info
1199 * @msg: received message header
1200 * @tsk: TIPC port associated with message
1202 * Note: Ancillary data is not captured if not requested by receiver.
1204 * Returns 0 if successful, otherwise errno
1206 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1207 struct tipc_sock *tsk)
1215 if (likely(m->msg_controllen == 0))
1218 /* Optionally capture errored message object(s) */
1219 err = msg ? msg_errcode(msg) : 0;
1220 if (unlikely(err)) {
1222 anc_data[1] = msg_data_sz(msg);
1223 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1227 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1234 /* Optionally capture message destination object */
1235 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1236 switch (dest_type) {
1237 case TIPC_NAMED_MSG:
1239 anc_data[0] = msg_nametype(msg);
1240 anc_data[1] = msg_namelower(msg);
1241 anc_data[2] = msg_namelower(msg);
1243 case TIPC_MCAST_MSG:
1245 anc_data[0] = msg_nametype(msg);
1246 anc_data[1] = msg_namelower(msg);
1247 anc_data[2] = msg_nameupper(msg);
1250 has_name = (tsk->conn_type != 0);
1251 anc_data[0] = tsk->conn_type;
1252 anc_data[1] = tsk->conn_instance;
1253 anc_data[2] = tsk->conn_instance;
1259 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1267 static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
1269 struct sk_buff *skb = NULL;
1270 struct tipc_msg *msg;
1271 u32 peer_port = tsk_peer_port(tsk);
1272 u32 dnode = tsk_peer_node(tsk);
1274 if (!tsk->connected)
1276 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode,
1277 tipc_own_addr, peer_port, tsk->ref, TIPC_OK);
1281 msg_set_msgcnt(msg, ack);
1282 tipc_link_xmit_skb(skb, dnode, msg_link_selector(msg));
1285 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1287 struct sock *sk = sock->sk;
1289 long timeo = *timeop;
1293 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1294 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1295 if (sock->state == SS_DISCONNECTING) {
1300 timeo = schedule_timeout(timeo);
1304 if (!skb_queue_empty(&sk->sk_receive_queue))
1306 err = sock_intr_errno(timeo);
1307 if (signal_pending(current))
1313 finish_wait(sk_sleep(sk), &wait);
1319 * tipc_recvmsg - receive packet-oriented message
1321 * @m: descriptor for message info
1322 * @buf_len: total size of user buffer area
1323 * @flags: receive flags
1325 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1326 * If the complete message doesn't fit in user area, truncate it.
1328 * Returns size of returned message data, errno otherwise
1330 static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
1331 struct msghdr *m, size_t buf_len, int flags)
1333 struct sock *sk = sock->sk;
1334 struct tipc_sock *tsk = tipc_sk(sk);
1335 struct sk_buff *buf;
1336 struct tipc_msg *msg;
1342 /* Catch invalid receive requests */
1343 if (unlikely(!buf_len))
1348 if (unlikely(sock->state == SS_UNCONNECTED)) {
1353 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1356 /* Look for a message in receive queue; wait if necessary */
1357 res = tipc_wait_for_rcvmsg(sock, &timeo);
1361 /* Look at first message in receive queue */
1362 buf = skb_peek(&sk->sk_receive_queue);
1364 sz = msg_data_sz(msg);
1365 err = msg_errcode(msg);
1367 /* Discard an empty non-errored message & try again */
1368 if ((!sz) && (!err)) {
1369 tsk_advance_rx_queue(sk);
1373 /* Capture sender's address (optional) */
1374 set_orig_addr(m, msg);
1376 /* Capture ancillary data (optional) */
1377 res = tipc_sk_anc_data_recv(m, msg, tsk);
1381 /* Capture message data (if valid) & compute return value (always) */
1383 if (unlikely(buf_len < sz)) {
1385 m->msg_flags |= MSG_TRUNC;
1387 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz);
1392 if ((sock->state == SS_READY) ||
1393 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1399 /* Consume received message (optional) */
1400 if (likely(!(flags & MSG_PEEK))) {
1401 if ((sock->state != SS_READY) &&
1402 (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1403 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1404 tsk->rcv_unacked = 0;
1406 tsk_advance_rx_queue(sk);
1414 * tipc_recv_stream - receive stream-oriented data
1416 * @m: descriptor for message info
1417 * @buf_len: total size of user buffer area
1418 * @flags: receive flags
1420 * Used for SOCK_STREAM messages only. If not enough data is available
1421 * will optionally wait for more; never truncates data.
1423 * Returns size of returned message data, errno otherwise
1425 static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
1426 struct msghdr *m, size_t buf_len, int flags)
1428 struct sock *sk = sock->sk;
1429 struct tipc_sock *tsk = tipc_sk(sk);
1430 struct sk_buff *buf;
1431 struct tipc_msg *msg;
1434 int sz_to_copy, target, needed;
1439 /* Catch invalid receive attempts */
1440 if (unlikely(!buf_len))
1445 if (unlikely(sock->state == SS_UNCONNECTED)) {
1450 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1451 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1454 /* Look for a message in receive queue; wait if necessary */
1455 res = tipc_wait_for_rcvmsg(sock, &timeo);
1459 /* Look at first message in receive queue */
1460 buf = skb_peek(&sk->sk_receive_queue);
1462 sz = msg_data_sz(msg);
1463 err = msg_errcode(msg);
1465 /* Discard an empty non-errored message & try again */
1466 if ((!sz) && (!err)) {
1467 tsk_advance_rx_queue(sk);
1471 /* Optionally capture sender's address & ancillary data of first msg */
1472 if (sz_copied == 0) {
1473 set_orig_addr(m, msg);
1474 res = tipc_sk_anc_data_recv(m, msg, tsk);
1479 /* Capture message data (if valid) & compute return value (always) */
1481 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1484 needed = (buf_len - sz_copied);
1485 sz_to_copy = (sz <= needed) ? sz : needed;
1487 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset,
1492 sz_copied += sz_to_copy;
1494 if (sz_to_copy < sz) {
1495 if (!(flags & MSG_PEEK))
1496 TIPC_SKB_CB(buf)->handle =
1497 (void *)(unsigned long)(offset + sz_to_copy);
1502 goto exit; /* can't add error msg to valid data */
1504 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1510 /* Consume received message (optional) */
1511 if (likely(!(flags & MSG_PEEK))) {
1512 if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1513 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1514 tsk->rcv_unacked = 0;
1516 tsk_advance_rx_queue(sk);
1519 /* Loop around if more data is required */
1520 if ((sz_copied < buf_len) && /* didn't get all requested data */
1521 (!skb_queue_empty(&sk->sk_receive_queue) ||
1522 (sz_copied < target)) && /* and more is ready or required */
1523 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1524 (!err)) /* and haven't reached a FIN */
1529 return sz_copied ? sz_copied : res;
1533 * tipc_write_space - wake up thread if port congestion is released
1536 static void tipc_write_space(struct sock *sk)
1538 struct socket_wq *wq;
1541 wq = rcu_dereference(sk->sk_wq);
1542 if (wq_has_sleeper(wq))
1543 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1544 POLLWRNORM | POLLWRBAND);
1549 * tipc_data_ready - wake up threads to indicate messages have been received
1551 * @len: the length of messages
1553 static void tipc_data_ready(struct sock *sk)
1555 struct socket_wq *wq;
1558 wq = rcu_dereference(sk->sk_wq);
1559 if (wq_has_sleeper(wq))
1560 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1561 POLLRDNORM | POLLRDBAND);
1566 * filter_connect - Handle all incoming messages for a connection-based socket
1570 * Returns 0 (TIPC_OK) if everything ok, -TIPC_ERR_NO_PORT otherwise
1572 static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
1574 struct sock *sk = &tsk->sk;
1575 struct socket *sock = sk->sk_socket;
1576 struct tipc_msg *msg = buf_msg(*buf);
1577 int retval = -TIPC_ERR_NO_PORT;
1582 switch ((int)sock->state) {
1584 /* Accept only connection-based messages sent by peer */
1585 if (tsk_peer_msg(tsk, msg)) {
1586 if (unlikely(msg_errcode(msg))) {
1587 sock->state = SS_DISCONNECTING;
1589 /* let timer expire on it's own */
1590 tipc_node_remove_conn(tsk_peer_node(tsk),
1597 /* Accept only ACK or NACK message */
1599 if (unlikely(!msg_connected(msg)))
1602 if (unlikely(msg_errcode(msg))) {
1603 sock->state = SS_DISCONNECTING;
1604 sk->sk_err = ECONNREFUSED;
1609 if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
1610 sock->state = SS_DISCONNECTING;
1611 sk->sk_err = EINVAL;
1616 tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg));
1617 msg_set_importance(&tsk->phdr, msg_importance(msg));
1618 sock->state = SS_CONNECTED;
1620 /* If an incoming message is an 'ACK-', it should be
1621 * discarded here because it doesn't contain useful
1622 * data. In addition, we should try to wake up
1623 * connect() routine if sleeping.
1625 if (msg_data_sz(msg) == 0) {
1628 if (waitqueue_active(sk_sleep(sk)))
1629 wake_up_interruptible(sk_sleep(sk));
1634 case SS_UNCONNECTED:
1635 /* Accept only SYN message */
1636 if (!msg_connected(msg) && !(msg_errcode(msg)))
1639 case SS_DISCONNECTING:
1642 pr_err("Unknown socket state %u\n", sock->state);
1648 * rcvbuf_limit - get proper overload limit of socket receive queue
1652 * For all connection oriented messages, irrespective of importance,
1653 * the default overload value (i.e. 67MB) is set as limit.
1655 * For all connectionless messages, by default new queue limits are
1658 * TIPC_LOW_IMPORTANCE (4 MB)
1659 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1660 * TIPC_HIGH_IMPORTANCE (16 MB)
1661 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1663 * Returns overload limit according to corresponding message importance
1665 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1667 struct tipc_msg *msg = buf_msg(buf);
1669 if (msg_connected(msg))
1670 return sysctl_tipc_rmem[2];
1672 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1673 msg_importance(msg);
1677 * filter_rcv - validate incoming message
1681 * Enqueues message on receive queue if acceptable; optionally handles
1682 * disconnect indication for a connected socket.
1684 * Called with socket lock already taken; port lock may also be taken.
1686 * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message
1687 * to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded
1689 static int filter_rcv(struct sock *sk, struct sk_buff *buf)
1691 struct socket *sock = sk->sk_socket;
1692 struct tipc_sock *tsk = tipc_sk(sk);
1693 struct tipc_msg *msg = buf_msg(buf);
1694 unsigned int limit = rcvbuf_limit(sk, buf);
1698 if (unlikely(msg_user(msg) == CONN_MANAGER))
1699 return tipc_sk_proto_rcv(tsk, &onode, buf);
1701 if (unlikely(msg_user(msg) == SOCK_WAKEUP)) {
1704 sk->sk_write_space(sk);
1708 /* Reject message if it is wrong sort of message for socket */
1709 if (msg_type(msg) > TIPC_DIRECT_MSG)
1710 return -TIPC_ERR_NO_PORT;
1712 if (sock->state == SS_READY) {
1713 if (msg_connected(msg))
1714 return -TIPC_ERR_NO_PORT;
1716 rc = filter_connect(tsk, &buf);
1717 if (rc != TIPC_OK || buf == NULL)
1721 /* Reject message if there isn't room to queue it */
1722 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1723 return -TIPC_ERR_OVERLOAD;
1725 /* Enqueue message */
1726 TIPC_SKB_CB(buf)->handle = NULL;
1727 __skb_queue_tail(&sk->sk_receive_queue, buf);
1728 skb_set_owner_r(buf, sk);
1730 sk->sk_data_ready(sk);
1735 * tipc_backlog_rcv - handle incoming message from backlog queue
1739 * Caller must hold socket lock, but not port lock.
1743 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
1747 struct tipc_sock *tsk = tipc_sk(sk);
1748 uint truesize = skb->truesize;
1750 rc = filter_rcv(sk, skb);
1753 if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT)
1754 atomic_add(truesize, &tsk->dupl_rcvcnt);
1758 if ((rc < 0) && !tipc_msg_reverse(skb, &onode, -rc))
1761 tipc_link_xmit_skb(skb, onode, 0);
1767 * tipc_sk_rcv - handle incoming message
1768 * @skb: buffer containing arriving message
1770 * Returns 0 if success, or errno: -EHOSTUNREACH
1772 int tipc_sk_rcv(struct sk_buff *skb)
1774 struct tipc_sock *tsk;
1776 u32 dport = msg_destport(buf_msg(skb));
1781 /* Validate destination and message */
1782 tsk = tipc_sk_get(dport);
1783 if (unlikely(!tsk)) {
1784 rc = tipc_msg_eval(skb, &dnode);
1790 spin_lock_bh(&sk->sk_lock.slock);
1792 if (!sock_owned_by_user(sk)) {
1793 rc = filter_rcv(sk, skb);
1795 if (sk->sk_backlog.len == 0)
1796 atomic_set(&tsk->dupl_rcvcnt, 0);
1797 limit = rcvbuf_limit(sk, skb) + atomic_read(&tsk->dupl_rcvcnt);
1798 if (sk_add_backlog(sk, skb, limit))
1799 rc = -TIPC_ERR_OVERLOAD;
1801 spin_unlock_bh(&sk->sk_lock.slock);
1806 if ((rc < 0) && !tipc_msg_reverse(skb, &dnode, -rc))
1807 return -EHOSTUNREACH;
1809 tipc_link_xmit_skb(skb, dnode, 0);
1810 return (rc < 0) ? -EHOSTUNREACH : 0;
1813 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1815 struct sock *sk = sock->sk;
1820 int err = sock_error(sk);
1825 if (signal_pending(current))
1826 return sock_intr_errno(*timeo_p);
1828 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1829 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1830 finish_wait(sk_sleep(sk), &wait);
1836 * tipc_connect - establish a connection to another TIPC port
1837 * @sock: socket structure
1838 * @dest: socket address for destination port
1839 * @destlen: size of socket address data structure
1840 * @flags: file-related flags associated with socket
1842 * Returns 0 on success, errno otherwise
1844 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1845 int destlen, int flags)
1847 struct sock *sk = sock->sk;
1848 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1849 struct msghdr m = {NULL,};
1850 long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1851 socket_state previous;
1856 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1857 if (sock->state == SS_READY) {
1863 * Reject connection attempt using multicast address
1865 * Note: send_msg() validates the rest of the address fields,
1866 * so there's no need to do it here
1868 if (dst->addrtype == TIPC_ADDR_MCAST) {
1873 previous = sock->state;
1874 switch (sock->state) {
1875 case SS_UNCONNECTED:
1876 /* Send a 'SYN-' to destination */
1878 m.msg_namelen = destlen;
1880 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1881 * indicate send_msg() is never blocked.
1884 m.msg_flags = MSG_DONTWAIT;
1886 res = tipc_sendmsg(NULL, sock, &m, 0);
1887 if ((res < 0) && (res != -EWOULDBLOCK))
1890 /* Just entered SS_CONNECTING state; the only
1891 * difference is that return value in non-blocking
1892 * case is EINPROGRESS, rather than EALREADY.
1896 if (previous == SS_CONNECTING)
1900 timeout = msecs_to_jiffies(timeout);
1901 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1902 res = tipc_wait_for_connect(sock, &timeout);
1917 * tipc_listen - allow socket to listen for incoming connections
1918 * @sock: socket structure
1921 * Returns 0 on success, errno otherwise
1923 static int tipc_listen(struct socket *sock, int len)
1925 struct sock *sk = sock->sk;
1930 if (sock->state != SS_UNCONNECTED)
1933 sock->state = SS_LISTENING;
1941 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1943 struct sock *sk = sock->sk;
1947 /* True wake-one mechanism for incoming connections: only
1948 * one process gets woken up, not the 'whole herd'.
1949 * Since we do not 'race & poll' for established sockets
1950 * anymore, the common case will execute the loop only once.
1953 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1954 TASK_INTERRUPTIBLE);
1955 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1957 timeo = schedule_timeout(timeo);
1961 if (!skb_queue_empty(&sk->sk_receive_queue))
1964 if (sock->state != SS_LISTENING)
1966 err = sock_intr_errno(timeo);
1967 if (signal_pending(current))
1973 finish_wait(sk_sleep(sk), &wait);
1978 * tipc_accept - wait for connection request
1979 * @sock: listening socket
1980 * @newsock: new socket that is to be connected
1981 * @flags: file-related flags associated with socket
1983 * Returns 0 on success, errno otherwise
1985 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1987 struct sock *new_sk, *sk = sock->sk;
1988 struct sk_buff *buf;
1989 struct tipc_sock *new_tsock;
1990 struct tipc_msg *msg;
1996 if (sock->state != SS_LISTENING) {
2000 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2001 res = tipc_wait_for_accept(sock, timeo);
2005 buf = skb_peek(&sk->sk_receive_queue);
2007 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
2011 new_sk = new_sock->sk;
2012 new_tsock = tipc_sk(new_sk);
2015 /* we lock on new_sk; but lockdep sees the lock on sk */
2016 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2019 * Reject any stray messages received by new socket
2020 * before the socket lock was taken (very, very unlikely)
2022 tsk_rej_rx_queue(new_sk);
2024 /* Connect new socket to it's peer */
2025 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2026 new_sock->state = SS_CONNECTED;
2028 tsk_set_importance(new_tsock, msg_importance(msg));
2029 if (msg_named(msg)) {
2030 new_tsock->conn_type = msg_nametype(msg);
2031 new_tsock->conn_instance = msg_nameinst(msg);
2035 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2036 * Respond to 'SYN+' by queuing it on new socket.
2038 if (!msg_data_sz(msg)) {
2039 struct msghdr m = {NULL,};
2041 tsk_advance_rx_queue(sk);
2042 tipc_send_packet(NULL, new_sock, &m, 0);
2044 __skb_dequeue(&sk->sk_receive_queue);
2045 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2046 skb_set_owner_r(buf, new_sk);
2048 release_sock(new_sk);
2055 * tipc_shutdown - shutdown socket connection
2056 * @sock: socket structure
2057 * @how: direction to close (must be SHUT_RDWR)
2059 * Terminates connection (if necessary), then purges socket's receive queue.
2061 * Returns 0 on success, errno otherwise
2063 static int tipc_shutdown(struct socket *sock, int how)
2065 struct sock *sk = sock->sk;
2066 struct tipc_sock *tsk = tipc_sk(sk);
2067 struct sk_buff *skb;
2071 if (how != SHUT_RDWR)
2076 switch (sock->state) {
2081 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
2082 skb = __skb_dequeue(&sk->sk_receive_queue);
2084 if (TIPC_SKB_CB(skb)->handle != NULL) {
2088 if (tipc_msg_reverse(skb, &dnode, TIPC_CONN_SHUTDOWN))
2089 tipc_link_xmit_skb(skb, dnode, tsk->ref);
2090 tipc_node_remove_conn(dnode, tsk->ref);
2092 dnode = tsk_peer_node(tsk);
2093 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2094 TIPC_CONN_MSG, SHORT_H_SIZE,
2095 0, dnode, tipc_own_addr,
2097 tsk->ref, TIPC_CONN_SHUTDOWN);
2098 tipc_link_xmit_skb(skb, dnode, tsk->ref);
2101 sock->state = SS_DISCONNECTING;
2102 tipc_node_remove_conn(dnode, tsk->ref);
2105 case SS_DISCONNECTING:
2107 /* Discard any unreceived messages */
2108 __skb_queue_purge(&sk->sk_receive_queue);
2110 /* Wake up anyone sleeping in poll */
2111 sk->sk_state_change(sk);
2123 static void tipc_sk_timeout(unsigned long ref)
2125 struct tipc_sock *tsk;
2127 struct sk_buff *skb = NULL;
2128 u32 peer_port, peer_node;
2130 tsk = tipc_sk_get(ref);
2136 if (!tsk->connected) {
2140 peer_port = tsk_peer_port(tsk);
2141 peer_node = tsk_peer_node(tsk);
2143 if (tsk->probing_state == TIPC_CONN_PROBING) {
2144 /* Previous probe not answered -> self abort */
2145 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
2146 SHORT_H_SIZE, 0, tipc_own_addr,
2147 peer_node, ref, peer_port,
2150 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE,
2151 0, peer_node, tipc_own_addr,
2152 peer_port, ref, TIPC_OK);
2153 tsk->probing_state = TIPC_CONN_PROBING;
2154 k_start_timer(&tsk->timer, tsk->probing_interval);
2158 tipc_link_xmit_skb(skb, peer_node, ref);
2163 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2164 struct tipc_name_seq const *seq)
2166 struct publication *publ;
2171 key = tsk->ref + tsk->pub_count + 1;
2172 if (key == tsk->ref)
2175 publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
2176 scope, tsk->ref, key);
2177 if (unlikely(!publ))
2180 list_add(&publ->pport_list, &tsk->publications);
2186 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2187 struct tipc_name_seq const *seq)
2189 struct publication *publ;
2190 struct publication *safe;
2193 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2195 if (publ->scope != scope)
2197 if (publ->type != seq->type)
2199 if (publ->lower != seq->lower)
2201 if (publ->upper != seq->upper)
2203 tipc_nametbl_withdraw(publ->type, publ->lower,
2204 publ->ref, publ->key);
2208 tipc_nametbl_withdraw(publ->type, publ->lower,
2209 publ->ref, publ->key);
2212 if (list_empty(&tsk->publications))
2217 static int tipc_sk_show(struct tipc_sock *tsk, char *buf,
2218 int len, int full_id)
2220 struct publication *publ;
2224 ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
2225 tipc_zone(tipc_own_addr),
2226 tipc_cluster(tipc_own_addr),
2227 tipc_node(tipc_own_addr), tsk->ref);
2229 ret = tipc_snprintf(buf, len, "%-10u:", tsk->ref);
2231 if (tsk->connected) {
2232 u32 dport = tsk_peer_port(tsk);
2233 u32 destnode = tsk_peer_node(tsk);
2235 ret += tipc_snprintf(buf + ret, len - ret,
2236 " connected to <%u.%u.%u:%u>",
2237 tipc_zone(destnode),
2238 tipc_cluster(destnode),
2239 tipc_node(destnode), dport);
2240 if (tsk->conn_type != 0)
2241 ret += tipc_snprintf(buf + ret, len - ret,
2242 " via {%u,%u}", tsk->conn_type,
2243 tsk->conn_instance);
2244 } else if (tsk->published) {
2245 ret += tipc_snprintf(buf + ret, len - ret, " bound to");
2246 list_for_each_entry(publ, &tsk->publications, pport_list) {
2247 if (publ->lower == publ->upper)
2248 ret += tipc_snprintf(buf + ret, len - ret,
2249 " {%u,%u}", publ->type,
2252 ret += tipc_snprintf(buf + ret, len - ret,
2253 " {%u,%u,%u}", publ->type,
2254 publ->lower, publ->upper);
2257 ret += tipc_snprintf(buf + ret, len - ret, "\n");
2261 struct sk_buff *tipc_sk_socks_show(void)
2263 struct sk_buff *buf;
2264 struct tlv_desc *rep_tlv;
2267 struct tipc_sock *tsk;
2271 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
2274 rep_tlv = (struct tlv_desc *)buf->data;
2275 pb = TLV_DATA(rep_tlv);
2276 pb_len = ULTRA_STRING_MAX_LEN;
2278 tsk = tipc_sk_get_next(&ref);
2279 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2280 lock_sock(&tsk->sk);
2281 str_len += tipc_sk_show(tsk, pb + str_len,
2282 pb_len - str_len, 0);
2283 release_sock(&tsk->sk);
2286 str_len += 1; /* for "\0" */
2287 skb_put(buf, TLV_SPACE(str_len));
2288 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
2293 /* tipc_sk_reinit: set non-zero address in all existing sockets
2294 * when we go from standalone to network mode.
2296 void tipc_sk_reinit(void)
2298 struct tipc_msg *msg;
2300 struct tipc_sock *tsk = tipc_sk_get_next(&ref);
2302 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2303 lock_sock(&tsk->sk);
2305 msg_set_prevnode(msg, tipc_own_addr);
2306 msg_set_orignode(msg, tipc_own_addr);
2307 release_sock(&tsk->sk);
2313 * struct reference - TIPC socket reference entry
2314 * @tsk: pointer to socket associated with reference entry
2315 * @ref: reference value for socket (combines instance & array index info)
2318 struct tipc_sock *tsk;
2323 * struct tipc_ref_table - table of TIPC socket reference entries
2324 * @entries: pointer to array of reference entries
2325 * @capacity: array index of first unusable entry
2326 * @init_point: array index of first uninitialized entry
2327 * @first_free: array index of first unused socket reference entry
2328 * @last_free: array index of last unused socket reference entry
2329 * @index_mask: bitmask for array index portion of reference values
2330 * @start_mask: initial value for instance value portion of reference values
2333 struct reference *entries;
2342 /* Socket reference table consists of 2**N entries.
2344 * State Socket ptr Reference
2345 * ----- ---------- ---------
2346 * In use non-NULL XXXX|own index
2347 * (XXXX changes each time entry is acquired)
2348 * Free NULL YYYY|next free index
2349 * (YYYY is one more than last used XXXX)
2350 * Uninitialized NULL 0
2352 * Entry 0 is not used; this allows index 0 to denote the end of the free list.
2354 * Note that a reference value of 0 does not necessarily indicate that an
2355 * entry is uninitialized, since the last entry in the free list could also
2356 * have a reference value of 0 (although this is unlikely).
2359 static struct ref_table tipc_ref_table;
2361 static DEFINE_RWLOCK(ref_table_lock);
2364 * tipc_ref_table_init - create reference table for sockets
2366 int tipc_sk_ref_table_init(u32 req_sz, u32 start)
2368 struct reference *table;
2371 /* account for unused entry, then round up size to a power of 2 */
2374 for (actual_sz = 16; actual_sz < req_sz; actual_sz <<= 1) {
2378 /* allocate table & mark all entries as uninitialized */
2379 table = vzalloc(actual_sz * sizeof(struct reference));
2383 tipc_ref_table.entries = table;
2384 tipc_ref_table.capacity = req_sz;
2385 tipc_ref_table.init_point = 1;
2386 tipc_ref_table.first_free = 0;
2387 tipc_ref_table.last_free = 0;
2388 tipc_ref_table.index_mask = actual_sz - 1;
2389 tipc_ref_table.start_mask = start & ~tipc_ref_table.index_mask;
2395 * tipc_ref_table_stop - destroy reference table for sockets
2397 void tipc_sk_ref_table_stop(void)
2399 if (!tipc_ref_table.entries)
2401 vfree(tipc_ref_table.entries);
2402 tipc_ref_table.entries = NULL;
2405 /* tipc_ref_acquire - create reference to a socket
2407 * Register an socket pointer in the reference table.
2408 * Returns a unique reference value that is used from then on to retrieve the
2409 * socket pointer, or to determine if the socket has been deregistered.
2411 u32 tipc_sk_ref_acquire(struct tipc_sock *tsk)
2415 u32 next_plus_upper;
2417 struct reference *entry;
2419 if (unlikely(!tsk)) {
2420 pr_err("Attempt to acquire ref. to non-existent obj\n");
2423 if (unlikely(!tipc_ref_table.entries)) {
2424 pr_err("Ref. table not found in acquisition attempt\n");
2428 /* Take a free entry, if available; otherwise initialize a new one */
2429 write_lock_bh(&ref_table_lock);
2430 index = tipc_ref_table.first_free;
2431 entry = &tipc_ref_table.entries[index];
2433 if (likely(index)) {
2434 index = tipc_ref_table.first_free;
2435 entry = &tipc_ref_table.entries[index];
2436 index_mask = tipc_ref_table.index_mask;
2437 next_plus_upper = entry->ref;
2438 tipc_ref_table.first_free = next_plus_upper & index_mask;
2439 ref = (next_plus_upper & ~index_mask) + index;
2441 } else if (tipc_ref_table.init_point < tipc_ref_table.capacity) {
2442 index = tipc_ref_table.init_point++;
2443 entry = &tipc_ref_table.entries[index];
2444 ref = tipc_ref_table.start_mask + index;
2451 write_unlock_bh(&ref_table_lock);
2455 /* tipc_sk_ref_discard - invalidate reference to an socket
2457 * Disallow future references to an socket and free up the entry for re-use.
2459 void tipc_sk_ref_discard(u32 ref)
2461 struct reference *entry;
2465 if (unlikely(!tipc_ref_table.entries)) {
2466 pr_err("Ref. table not found during discard attempt\n");
2470 index_mask = tipc_ref_table.index_mask;
2471 index = ref & index_mask;
2472 entry = &tipc_ref_table.entries[index];
2474 write_lock_bh(&ref_table_lock);
2476 if (unlikely(!entry->tsk)) {
2477 pr_err("Attempt to discard ref. to non-existent socket\n");
2480 if (unlikely(entry->ref != ref)) {
2481 pr_err("Attempt to discard non-existent reference\n");
2485 /* Mark entry as unused; increment instance part of entry's
2486 * reference to invalidate any subsequent references
2490 entry->ref = (ref & ~index_mask) + (index_mask + 1);
2492 /* Append entry to free entry list */
2493 if (unlikely(tipc_ref_table.first_free == 0))
2494 tipc_ref_table.first_free = index;
2496 tipc_ref_table.entries[tipc_ref_table.last_free].ref |= index;
2497 tipc_ref_table.last_free = index;
2499 write_unlock_bh(&ref_table_lock);
2502 /* tipc_sk_get - find referenced socket and return pointer to it
2504 struct tipc_sock *tipc_sk_get(u32 ref)
2506 struct reference *entry;
2507 struct tipc_sock *tsk;
2509 if (unlikely(!tipc_ref_table.entries))
2511 read_lock_bh(&ref_table_lock);
2512 entry = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
2514 if (likely(tsk && (entry->ref == ref)))
2515 sock_hold(&tsk->sk);
2518 read_unlock_bh(&ref_table_lock);
2522 /* tipc_sk_get_next - lock & return next socket after referenced one
2524 struct tipc_sock *tipc_sk_get_next(u32 *ref)
2526 struct reference *entry;
2527 struct tipc_sock *tsk = NULL;
2528 uint index = *ref & tipc_ref_table.index_mask;
2530 read_lock_bh(&ref_table_lock);
2531 while (++index < tipc_ref_table.capacity) {
2532 entry = &tipc_ref_table.entries[index];
2536 sock_hold(&tsk->sk);
2540 read_unlock_bh(&ref_table_lock);
2544 static void tipc_sk_put(struct tipc_sock *tsk)
2550 * tipc_setsockopt - set socket option
2551 * @sock: socket structure
2552 * @lvl: option level
2553 * @opt: option identifier
2554 * @ov: pointer to new option value
2555 * @ol: length of option value
2557 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2558 * (to ease compatibility).
2560 * Returns 0 on success, errno otherwise
2562 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2563 char __user *ov, unsigned int ol)
2565 struct sock *sk = sock->sk;
2566 struct tipc_sock *tsk = tipc_sk(sk);
2570 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2572 if (lvl != SOL_TIPC)
2573 return -ENOPROTOOPT;
2574 if (ol < sizeof(value))
2576 res = get_user(value, (u32 __user *)ov);
2583 case TIPC_IMPORTANCE:
2584 res = tsk_set_importance(tsk, value);
2586 case TIPC_SRC_DROPPABLE:
2587 if (sock->type != SOCK_STREAM)
2588 tsk_set_unreliable(tsk, value);
2592 case TIPC_DEST_DROPPABLE:
2593 tsk_set_unreturnable(tsk, value);
2595 case TIPC_CONN_TIMEOUT:
2596 tipc_sk(sk)->conn_timeout = value;
2597 /* no need to set "res", since already 0 at this point */
2609 * tipc_getsockopt - get socket option
2610 * @sock: socket structure
2611 * @lvl: option level
2612 * @opt: option identifier
2613 * @ov: receptacle for option value
2614 * @ol: receptacle for length of option value
2616 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2617 * (to ease compatibility).
2619 * Returns 0 on success, errno otherwise
2621 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2622 char __user *ov, int __user *ol)
2624 struct sock *sk = sock->sk;
2625 struct tipc_sock *tsk = tipc_sk(sk);
2630 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2631 return put_user(0, ol);
2632 if (lvl != SOL_TIPC)
2633 return -ENOPROTOOPT;
2634 res = get_user(len, ol);
2641 case TIPC_IMPORTANCE:
2642 value = tsk_importance(tsk);
2644 case TIPC_SRC_DROPPABLE:
2645 value = tsk_unreliable(tsk);
2647 case TIPC_DEST_DROPPABLE:
2648 value = tsk_unreturnable(tsk);
2650 case TIPC_CONN_TIMEOUT:
2651 value = tsk->conn_timeout;
2652 /* no need to set "res", since already 0 at this point */
2654 case TIPC_NODE_RECVQ_DEPTH:
2655 value = 0; /* was tipc_queue_size, now obsolete */
2657 case TIPC_SOCK_RECVQ_DEPTH:
2658 value = skb_queue_len(&sk->sk_receive_queue);
2667 return res; /* "get" failed */
2669 if (len < sizeof(value))
2672 if (copy_to_user(ov, &value, sizeof(value)))
2675 return put_user(sizeof(value), ol);
2678 static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg)
2680 struct tipc_sioc_ln_req lnr;
2681 void __user *argp = (void __user *)arg;
2684 case SIOCGETLINKNAME:
2685 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2687 if (!tipc_node_get_linkname(lnr.bearer_id & 0xffff, lnr.peer,
2688 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2689 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2693 return -EADDRNOTAVAIL;
2695 return -ENOIOCTLCMD;
2699 /* Protocol switches for the various types of TIPC sockets */
2701 static const struct proto_ops msg_ops = {
2702 .owner = THIS_MODULE,
2704 .release = tipc_release,
2706 .connect = tipc_connect,
2707 .socketpair = sock_no_socketpair,
2708 .accept = sock_no_accept,
2709 .getname = tipc_getname,
2711 .ioctl = tipc_ioctl,
2712 .listen = sock_no_listen,
2713 .shutdown = tipc_shutdown,
2714 .setsockopt = tipc_setsockopt,
2715 .getsockopt = tipc_getsockopt,
2716 .sendmsg = tipc_sendmsg,
2717 .recvmsg = tipc_recvmsg,
2718 .mmap = sock_no_mmap,
2719 .sendpage = sock_no_sendpage
2722 static const struct proto_ops packet_ops = {
2723 .owner = THIS_MODULE,
2725 .release = tipc_release,
2727 .connect = tipc_connect,
2728 .socketpair = sock_no_socketpair,
2729 .accept = tipc_accept,
2730 .getname = tipc_getname,
2732 .ioctl = tipc_ioctl,
2733 .listen = tipc_listen,
2734 .shutdown = tipc_shutdown,
2735 .setsockopt = tipc_setsockopt,
2736 .getsockopt = tipc_getsockopt,
2737 .sendmsg = tipc_send_packet,
2738 .recvmsg = tipc_recvmsg,
2739 .mmap = sock_no_mmap,
2740 .sendpage = sock_no_sendpage
2743 static const struct proto_ops stream_ops = {
2744 .owner = THIS_MODULE,
2746 .release = tipc_release,
2748 .connect = tipc_connect,
2749 .socketpair = sock_no_socketpair,
2750 .accept = tipc_accept,
2751 .getname = tipc_getname,
2753 .ioctl = tipc_ioctl,
2754 .listen = tipc_listen,
2755 .shutdown = tipc_shutdown,
2756 .setsockopt = tipc_setsockopt,
2757 .getsockopt = tipc_getsockopt,
2758 .sendmsg = tipc_send_stream,
2759 .recvmsg = tipc_recv_stream,
2760 .mmap = sock_no_mmap,
2761 .sendpage = sock_no_sendpage
2764 static const struct net_proto_family tipc_family_ops = {
2765 .owner = THIS_MODULE,
2767 .create = tipc_sk_create
2770 static struct proto tipc_proto = {
2772 .owner = THIS_MODULE,
2773 .obj_size = sizeof(struct tipc_sock),
2774 .sysctl_rmem = sysctl_tipc_rmem
2777 static struct proto tipc_proto_kern = {
2779 .obj_size = sizeof(struct tipc_sock),
2780 .sysctl_rmem = sysctl_tipc_rmem
2784 * tipc_socket_init - initialize TIPC socket interface
2786 * Returns 0 on success, errno otherwise
2788 int tipc_socket_init(void)
2792 res = proto_register(&tipc_proto, 1);
2794 pr_err("Failed to register TIPC protocol type\n");
2798 res = sock_register(&tipc_family_ops);
2800 pr_err("Failed to register TIPC socket type\n");
2801 proto_unregister(&tipc_proto);
2809 * tipc_socket_stop - stop TIPC socket interface
2811 void tipc_socket_stop(void)
2813 sock_unregister(tipc_family_ops.family);
2814 proto_unregister(&tipc_proto);
2817 /* Caller should hold socket lock for the passed tipc socket. */
2818 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
2822 struct nlattr *nest;
2824 peer_node = tsk_peer_node(tsk);
2825 peer_port = tsk_peer_port(tsk);
2827 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
2829 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
2831 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
2834 if (tsk->conn_type != 0) {
2835 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
2837 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
2839 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
2842 nla_nest_end(skb, nest);
2847 nla_nest_cancel(skb, nest);
2852 /* Caller should hold socket lock for the passed tipc socket. */
2853 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
2854 struct tipc_sock *tsk)
2858 struct nlattr *attrs;
2860 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2861 &tipc_genl_v2_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
2865 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
2867 goto genlmsg_cancel;
2868 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->ref))
2869 goto attr_msg_cancel;
2870 if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr))
2871 goto attr_msg_cancel;
2873 if (tsk->connected) {
2874 err = __tipc_nl_add_sk_con(skb, tsk);
2876 goto attr_msg_cancel;
2877 } else if (!list_empty(&tsk->publications)) {
2878 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
2879 goto attr_msg_cancel;
2881 nla_nest_end(skb, attrs);
2882 genlmsg_end(skb, hdr);
2887 nla_nest_cancel(skb, attrs);
2889 genlmsg_cancel(skb, hdr);
2894 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
2897 struct tipc_sock *tsk;
2898 u32 prev_ref = cb->args[0];
2901 tsk = tipc_sk_get_next(&ref);
2902 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2903 lock_sock(&tsk->sk);
2904 err = __tipc_nl_add_sk(skb, cb, tsk);
2905 release_sock(&tsk->sk);
2913 cb->args[0] = prev_ref;
2918 /* Caller should hold socket lock for the passed tipc socket. */
2919 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
2920 struct netlink_callback *cb,
2921 struct publication *publ)
2924 struct nlattr *attrs;
2926 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2927 &tipc_genl_v2_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
2931 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
2933 goto genlmsg_cancel;
2935 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
2936 goto attr_msg_cancel;
2937 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
2938 goto attr_msg_cancel;
2939 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
2940 goto attr_msg_cancel;
2941 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
2942 goto attr_msg_cancel;
2944 nla_nest_end(skb, attrs);
2945 genlmsg_end(skb, hdr);
2950 nla_nest_cancel(skb, attrs);
2952 genlmsg_cancel(skb, hdr);
2957 /* Caller should hold socket lock for the passed tipc socket. */
2958 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
2959 struct netlink_callback *cb,
2960 struct tipc_sock *tsk, u32 *last_publ)
2963 struct publication *p;
2966 list_for_each_entry(p, &tsk->publications, pport_list) {
2967 if (p->key == *last_publ)
2970 if (p->key != *last_publ) {
2971 /* We never set seq or call nl_dump_check_consistent()
2972 * this means that setting prev_seq here will cause the
2973 * consistence check to fail in the netlink callback
2974 * handler. Resulting in the last NLMSG_DONE message
2975 * having the NLM_F_DUMP_INTR flag set.
2982 p = list_first_entry(&tsk->publications, struct publication,
2986 list_for_each_entry_from(p, &tsk->publications, pport_list) {
2987 err = __tipc_nl_add_sk_publ(skb, cb, p);
2989 *last_publ = p->key;
2998 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3001 u32 tsk_ref = cb->args[0];
3002 u32 last_publ = cb->args[1];
3003 u32 done = cb->args[2];
3004 struct tipc_sock *tsk;
3007 struct nlattr **attrs;
3008 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3010 err = tipc_nlmsg_parse(cb->nlh, &attrs);
3014 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
3015 attrs[TIPC_NLA_SOCK],
3016 tipc_nl_sock_policy);
3020 if (!sock[TIPC_NLA_SOCK_REF])
3023 tsk_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3029 tsk = tipc_sk_get(tsk_ref);
3033 lock_sock(&tsk->sk);
3034 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3037 release_sock(&tsk->sk);
3040 cb->args[0] = tsk_ref;
3041 cb->args[1] = last_publ;