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
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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 ((buf = __skb_dequeue(&sk->sk_receive_queue))) {
251 if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))
252 tipc_link_xmit(buf, 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 buf = __skb_dequeue(&sk->sk_receive_queue);
487 if (TIPC_SKB_CB(buf)->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(buf, &dnode, TIPC_ERR_NO_PORT))
497 tipc_link_xmit(buf, 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 buf = 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(buf, 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;
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 rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, &buf);
731 if (unlikely(rc < 0))
735 rc = tipc_bclink_xmit(buf);
736 if (likely(rc >= 0)) {
742 if (rc != -ELINKCONG)
744 tipc_sk(sk)->link_cong = 1;
745 rc = tipc_wait_for_sndmsg(sock, &timeo);
752 /* tipc_sk_mcast_rcv - Deliver multicast message to all destination sockets
754 void tipc_sk_mcast_rcv(struct sk_buff *buf)
756 struct tipc_msg *msg = buf_msg(buf);
757 struct tipc_port_list dports = {0, NULL, };
758 struct tipc_port_list *item;
760 uint i, last, dst = 0;
761 u32 scope = TIPC_CLUSTER_SCOPE;
763 if (in_own_node(msg_orignode(msg)))
764 scope = TIPC_NODE_SCOPE;
766 /* Create destination port list: */
767 tipc_nametbl_mc_translate(msg_nametype(msg),
778 for (item = &dports; item; item = item->next) {
779 for (i = 0; i < PLSIZE && ++dst <= last; i++) {
780 b = (dst != last) ? skb_clone(buf, GFP_ATOMIC) : buf;
782 pr_warn("Failed do clone mcast rcv buffer\n");
785 msg_set_destport(msg, item->ports[i]);
789 tipc_port_list_free(&dports);
793 * tipc_sk_proto_rcv - receive a connection mng protocol message
794 * @tsk: receiving socket
795 * @dnode: node to send response message to, if any
796 * @buf: buffer containing protocol message
797 * Returns 0 (TIPC_OK) if message was consumed, 1 (TIPC_FWD_MSG) if
798 * (CONN_PROBE_REPLY) message should be forwarded.
800 static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode,
803 struct tipc_msg *msg = buf_msg(buf);
806 /* Ignore if connection cannot be validated: */
807 if (!tsk_peer_msg(tsk, msg))
810 tsk->probing_state = TIPC_CONN_OK;
812 if (msg_type(msg) == CONN_ACK) {
813 conn_cong = tsk_conn_cong(tsk);
814 tsk->sent_unacked -= msg_msgcnt(msg);
816 tsk->sk.sk_write_space(&tsk->sk);
817 } else if (msg_type(msg) == CONN_PROBE) {
818 if (!tipc_msg_reverse(buf, dnode, TIPC_OK))
820 msg_set_type(msg, CONN_PROBE_REPLY);
823 /* Do nothing if msg_type() == CONN_PROBE_REPLY */
830 * dest_name_check - verify user is permitted to send to specified port name
831 * @dest: destination address
832 * @m: descriptor for message to be sent
834 * Prevents restricted configuration commands from being issued by
835 * unauthorized users.
837 * Returns 0 if permission is granted, otherwise errno
839 static int dest_name_check(struct sockaddr_tipc *dest, struct msghdr *m)
841 struct tipc_cfg_msg_hdr hdr;
843 if (unlikely(dest->addrtype == TIPC_ADDR_ID))
845 if (likely(dest->addr.name.name.type >= TIPC_RESERVED_TYPES))
847 if (likely(dest->addr.name.name.type == TIPC_TOP_SRV))
849 if (likely(dest->addr.name.name.type != TIPC_CFG_SRV))
852 if (!m->msg_iovlen || (m->msg_iov[0].iov_len < sizeof(hdr)))
854 if (copy_from_user(&hdr, m->msg_iov[0].iov_base, sizeof(hdr)))
856 if ((ntohs(hdr.tcm_type) & 0xC000) && (!capable(CAP_NET_ADMIN)))
862 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
864 struct sock *sk = sock->sk;
865 struct tipc_sock *tsk = tipc_sk(sk);
870 int err = sock_error(sk);
873 if (sock->state == SS_DISCONNECTING)
877 if (signal_pending(current))
878 return sock_intr_errno(*timeo_p);
880 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
881 done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
882 finish_wait(sk_sleep(sk), &wait);
888 * tipc_sendmsg - send message in connectionless manner
889 * @iocb: if NULL, indicates that socket lock is already held
890 * @sock: socket structure
891 * @m: message to send
892 * @dsz: amount of user data to be sent
894 * Message must have an destination specified explicitly.
895 * Used for SOCK_RDM and SOCK_DGRAM messages,
896 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
897 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
899 * Returns the number of bytes sent on success, or errno otherwise
901 static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
902 struct msghdr *m, size_t dsz)
904 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
905 struct sock *sk = sock->sk;
906 struct tipc_sock *tsk = tipc_sk(sk);
907 struct tipc_msg *mhdr = &tsk->phdr;
910 struct tipc_name_seq *seq = &dest->addr.nameseq;
916 return -EDESTADDRREQ;
918 if (unlikely((m->msg_namelen < sizeof(*dest)) ||
919 (dest->family != AF_TIPC)))
922 if (dsz > TIPC_MAX_USER_MSG_SIZE)
928 if (unlikely(sock->state != SS_READY)) {
929 if (sock->state == SS_LISTENING) {
933 if (sock->state != SS_UNCONNECTED) {
937 if (tsk->published) {
941 if (dest->addrtype == TIPC_ADDR_NAME) {
942 tsk->conn_type = dest->addr.name.name.type;
943 tsk->conn_instance = dest->addr.name.name.instance;
946 rc = dest_name_check(dest, m);
950 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
952 if (dest->addrtype == TIPC_ADDR_MCAST) {
953 rc = tipc_sendmcast(sock, seq, m, dsz, timeo);
955 } else if (dest->addrtype == TIPC_ADDR_NAME) {
956 u32 type = dest->addr.name.name.type;
957 u32 inst = dest->addr.name.name.instance;
958 u32 domain = dest->addr.name.domain;
961 msg_set_type(mhdr, TIPC_NAMED_MSG);
962 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
963 msg_set_nametype(mhdr, type);
964 msg_set_nameinst(mhdr, inst);
965 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
966 dport = tipc_nametbl_translate(type, inst, &dnode);
967 msg_set_destnode(mhdr, dnode);
968 msg_set_destport(mhdr, dport);
969 if (unlikely(!dport && !dnode)) {
973 } else if (dest->addrtype == TIPC_ADDR_ID) {
974 dnode = dest->addr.id.node;
975 msg_set_type(mhdr, TIPC_DIRECT_MSG);
976 msg_set_lookup_scope(mhdr, 0);
977 msg_set_destnode(mhdr, dnode);
978 msg_set_destport(mhdr, dest->addr.id.ref);
979 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
983 mtu = tipc_node_get_mtu(dnode, tsk->ref);
984 rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, &buf);
989 TIPC_SKB_CB(buf)->wakeup_pending = tsk->link_cong;
990 rc = tipc_link_xmit(buf, dnode, tsk->ref);
991 if (likely(rc >= 0)) {
992 if (sock->state != SS_READY)
993 sock->state = SS_CONNECTING;
999 if (rc != -ELINKCONG)
1002 rc = tipc_wait_for_sndmsg(sock, &timeo);
1004 kfree_skb_list(buf);
1013 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
1015 struct sock *sk = sock->sk;
1016 struct tipc_sock *tsk = tipc_sk(sk);
1021 int err = sock_error(sk);
1024 if (sock->state == SS_DISCONNECTING)
1026 else if (sock->state != SS_CONNECTED)
1030 if (signal_pending(current))
1031 return sock_intr_errno(*timeo_p);
1033 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1034 done = sk_wait_event(sk, timeo_p,
1036 !tsk_conn_cong(tsk)) ||
1038 finish_wait(sk_sleep(sk), &wait);
1044 * tipc_send_stream - send stream-oriented data
1046 * @sock: socket structure
1048 * @dsz: total length of data to be transmitted
1050 * Used for SOCK_STREAM data.
1052 * Returns the number of bytes sent on success (or partial success),
1053 * or errno if no data sent
1055 static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
1056 struct msghdr *m, size_t dsz)
1058 struct sock *sk = sock->sk;
1059 struct tipc_sock *tsk = tipc_sk(sk);
1060 struct tipc_msg *mhdr = &tsk->phdr;
1061 struct sk_buff *buf;
1062 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1067 uint mtu, send, sent = 0;
1069 /* Handle implied connection establishment */
1070 if (unlikely(dest)) {
1071 rc = tipc_sendmsg(iocb, sock, m, dsz);
1072 if (dsz && (dsz == rc))
1073 tsk->sent_unacked = 1;
1076 if (dsz > (uint)INT_MAX)
1082 if (unlikely(sock->state != SS_CONNECTED)) {
1083 if (sock->state == SS_DISCONNECTING)
1090 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1091 dnode = tsk_peer_node(tsk);
1095 send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
1096 rc = tipc_msg_build(mhdr, m, sent, send, mtu, &buf);
1097 if (unlikely(rc < 0))
1100 if (likely(!tsk_conn_cong(tsk))) {
1101 rc = tipc_link_xmit(buf, dnode, ref);
1103 tsk->sent_unacked++;
1109 if (rc == -EMSGSIZE) {
1110 tsk->max_pkt = tipc_node_get_mtu(dnode, ref);
1113 if (rc != -ELINKCONG)
1117 rc = tipc_wait_for_sndpkt(sock, &timeo);
1119 kfree_skb_list(buf);
1124 return sent ? sent : rc;
1128 * tipc_send_packet - send a connection-oriented message
1129 * @iocb: if NULL, indicates that socket lock is already held
1130 * @sock: socket structure
1131 * @m: message to send
1132 * @dsz: length of data to be transmitted
1134 * Used for SOCK_SEQPACKET messages.
1136 * Returns the number of bytes sent on success, or errno otherwise
1138 static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
1139 struct msghdr *m, size_t dsz)
1141 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1144 return tipc_send_stream(iocb, sock, m, dsz);
1147 /* tipc_sk_finish_conn - complete the setup of a connection
1149 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1152 struct tipc_msg *msg = &tsk->phdr;
1154 msg_set_destnode(msg, peer_node);
1155 msg_set_destport(msg, peer_port);
1156 msg_set_type(msg, TIPC_CONN_MSG);
1157 msg_set_lookup_scope(msg, 0);
1158 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1160 tsk->probing_interval = CONN_PROBING_INTERVAL;
1161 tsk->probing_state = TIPC_CONN_OK;
1163 k_start_timer(&tsk->timer, tsk->probing_interval);
1164 tipc_node_add_conn(peer_node, tsk->ref, peer_port);
1165 tsk->max_pkt = tipc_node_get_mtu(peer_node, tsk->ref);
1169 * set_orig_addr - capture sender's address for received message
1170 * @m: descriptor for message info
1171 * @msg: received message header
1173 * Note: Address is not captured if not requested by receiver.
1175 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
1177 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
1180 addr->family = AF_TIPC;
1181 addr->addrtype = TIPC_ADDR_ID;
1182 memset(&addr->addr, 0, sizeof(addr->addr));
1183 addr->addr.id.ref = msg_origport(msg);
1184 addr->addr.id.node = msg_orignode(msg);
1185 addr->addr.name.domain = 0; /* could leave uninitialized */
1186 addr->scope = 0; /* could leave uninitialized */
1187 m->msg_namelen = sizeof(struct sockaddr_tipc);
1192 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1193 * @m: descriptor for message info
1194 * @msg: received message header
1195 * @tsk: TIPC port associated with message
1197 * Note: Ancillary data is not captured if not requested by receiver.
1199 * Returns 0 if successful, otherwise errno
1201 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1202 struct tipc_sock *tsk)
1210 if (likely(m->msg_controllen == 0))
1213 /* Optionally capture errored message object(s) */
1214 err = msg ? msg_errcode(msg) : 0;
1215 if (unlikely(err)) {
1217 anc_data[1] = msg_data_sz(msg);
1218 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1222 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1229 /* Optionally capture message destination object */
1230 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1231 switch (dest_type) {
1232 case TIPC_NAMED_MSG:
1234 anc_data[0] = msg_nametype(msg);
1235 anc_data[1] = msg_namelower(msg);
1236 anc_data[2] = msg_namelower(msg);
1238 case TIPC_MCAST_MSG:
1240 anc_data[0] = msg_nametype(msg);
1241 anc_data[1] = msg_namelower(msg);
1242 anc_data[2] = msg_nameupper(msg);
1245 has_name = (tsk->conn_type != 0);
1246 anc_data[0] = tsk->conn_type;
1247 anc_data[1] = tsk->conn_instance;
1248 anc_data[2] = tsk->conn_instance;
1254 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1262 static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
1264 struct sk_buff *buf = NULL;
1265 struct tipc_msg *msg;
1266 u32 peer_port = tsk_peer_port(tsk);
1267 u32 dnode = tsk_peer_node(tsk);
1269 if (!tsk->connected)
1271 buf = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode,
1272 tipc_own_addr, peer_port, tsk->ref, TIPC_OK);
1276 msg_set_msgcnt(msg, ack);
1277 tipc_link_xmit(buf, dnode, msg_link_selector(msg));
1280 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1282 struct sock *sk = sock->sk;
1284 long timeo = *timeop;
1288 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1289 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1290 if (sock->state == SS_DISCONNECTING) {
1295 timeo = schedule_timeout(timeo);
1299 if (!skb_queue_empty(&sk->sk_receive_queue))
1301 err = sock_intr_errno(timeo);
1302 if (signal_pending(current))
1308 finish_wait(sk_sleep(sk), &wait);
1314 * tipc_recvmsg - receive packet-oriented message
1316 * @m: descriptor for message info
1317 * @buf_len: total size of user buffer area
1318 * @flags: receive flags
1320 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1321 * If the complete message doesn't fit in user area, truncate it.
1323 * Returns size of returned message data, errno otherwise
1325 static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
1326 struct msghdr *m, size_t buf_len, int flags)
1328 struct sock *sk = sock->sk;
1329 struct tipc_sock *tsk = tipc_sk(sk);
1330 struct sk_buff *buf;
1331 struct tipc_msg *msg;
1337 /* Catch invalid receive requests */
1338 if (unlikely(!buf_len))
1343 if (unlikely(sock->state == SS_UNCONNECTED)) {
1348 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1351 /* Look for a message in receive queue; wait if necessary */
1352 res = tipc_wait_for_rcvmsg(sock, &timeo);
1356 /* Look at first message in receive queue */
1357 buf = skb_peek(&sk->sk_receive_queue);
1359 sz = msg_data_sz(msg);
1360 err = msg_errcode(msg);
1362 /* Discard an empty non-errored message & try again */
1363 if ((!sz) && (!err)) {
1364 tsk_advance_rx_queue(sk);
1368 /* Capture sender's address (optional) */
1369 set_orig_addr(m, msg);
1371 /* Capture ancillary data (optional) */
1372 res = tipc_sk_anc_data_recv(m, msg, tsk);
1376 /* Capture message data (if valid) & compute return value (always) */
1378 if (unlikely(buf_len < sz)) {
1380 m->msg_flags |= MSG_TRUNC;
1382 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz);
1387 if ((sock->state == SS_READY) ||
1388 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1394 /* Consume received message (optional) */
1395 if (likely(!(flags & MSG_PEEK))) {
1396 if ((sock->state != SS_READY) &&
1397 (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1398 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1399 tsk->rcv_unacked = 0;
1401 tsk_advance_rx_queue(sk);
1409 * tipc_recv_stream - receive stream-oriented data
1411 * @m: descriptor for message info
1412 * @buf_len: total size of user buffer area
1413 * @flags: receive flags
1415 * Used for SOCK_STREAM messages only. If not enough data is available
1416 * will optionally wait for more; never truncates data.
1418 * Returns size of returned message data, errno otherwise
1420 static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
1421 struct msghdr *m, size_t buf_len, int flags)
1423 struct sock *sk = sock->sk;
1424 struct tipc_sock *tsk = tipc_sk(sk);
1425 struct sk_buff *buf;
1426 struct tipc_msg *msg;
1429 int sz_to_copy, target, needed;
1434 /* Catch invalid receive attempts */
1435 if (unlikely(!buf_len))
1440 if (unlikely(sock->state == SS_UNCONNECTED)) {
1445 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1446 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1449 /* Look for a message in receive queue; wait if necessary */
1450 res = tipc_wait_for_rcvmsg(sock, &timeo);
1454 /* Look at first message in receive queue */
1455 buf = skb_peek(&sk->sk_receive_queue);
1457 sz = msg_data_sz(msg);
1458 err = msg_errcode(msg);
1460 /* Discard an empty non-errored message & try again */
1461 if ((!sz) && (!err)) {
1462 tsk_advance_rx_queue(sk);
1466 /* Optionally capture sender's address & ancillary data of first msg */
1467 if (sz_copied == 0) {
1468 set_orig_addr(m, msg);
1469 res = tipc_sk_anc_data_recv(m, msg, tsk);
1474 /* Capture message data (if valid) & compute return value (always) */
1476 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1479 needed = (buf_len - sz_copied);
1480 sz_to_copy = (sz <= needed) ? sz : needed;
1482 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset,
1487 sz_copied += sz_to_copy;
1489 if (sz_to_copy < sz) {
1490 if (!(flags & MSG_PEEK))
1491 TIPC_SKB_CB(buf)->handle =
1492 (void *)(unsigned long)(offset + sz_to_copy);
1497 goto exit; /* can't add error msg to valid data */
1499 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1505 /* Consume received message (optional) */
1506 if (likely(!(flags & MSG_PEEK))) {
1507 if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1508 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1509 tsk->rcv_unacked = 0;
1511 tsk_advance_rx_queue(sk);
1514 /* Loop around if more data is required */
1515 if ((sz_copied < buf_len) && /* didn't get all requested data */
1516 (!skb_queue_empty(&sk->sk_receive_queue) ||
1517 (sz_copied < target)) && /* and more is ready or required */
1518 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1519 (!err)) /* and haven't reached a FIN */
1524 return sz_copied ? sz_copied : res;
1528 * tipc_write_space - wake up thread if port congestion is released
1531 static void tipc_write_space(struct sock *sk)
1533 struct socket_wq *wq;
1536 wq = rcu_dereference(sk->sk_wq);
1537 if (wq_has_sleeper(wq))
1538 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1539 POLLWRNORM | POLLWRBAND);
1544 * tipc_data_ready - wake up threads to indicate messages have been received
1546 * @len: the length of messages
1548 static void tipc_data_ready(struct sock *sk)
1550 struct socket_wq *wq;
1553 wq = rcu_dereference(sk->sk_wq);
1554 if (wq_has_sleeper(wq))
1555 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1556 POLLRDNORM | POLLRDBAND);
1561 * filter_connect - Handle all incoming messages for a connection-based socket
1565 * Returns 0 (TIPC_OK) if everything ok, -TIPC_ERR_NO_PORT otherwise
1567 static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
1569 struct sock *sk = &tsk->sk;
1570 struct socket *sock = sk->sk_socket;
1571 struct tipc_msg *msg = buf_msg(*buf);
1572 int retval = -TIPC_ERR_NO_PORT;
1577 switch ((int)sock->state) {
1579 /* Accept only connection-based messages sent by peer */
1580 if (tsk_peer_msg(tsk, msg)) {
1581 if (unlikely(msg_errcode(msg))) {
1582 sock->state = SS_DISCONNECTING;
1584 /* let timer expire on it's own */
1585 tipc_node_remove_conn(tsk_peer_node(tsk),
1592 /* Accept only ACK or NACK message */
1594 if (unlikely(!msg_connected(msg)))
1597 if (unlikely(msg_errcode(msg))) {
1598 sock->state = SS_DISCONNECTING;
1599 sk->sk_err = ECONNREFUSED;
1604 if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
1605 sock->state = SS_DISCONNECTING;
1606 sk->sk_err = EINVAL;
1611 tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg));
1612 msg_set_importance(&tsk->phdr, msg_importance(msg));
1613 sock->state = SS_CONNECTED;
1615 /* If an incoming message is an 'ACK-', it should be
1616 * discarded here because it doesn't contain useful
1617 * data. In addition, we should try to wake up
1618 * connect() routine if sleeping.
1620 if (msg_data_sz(msg) == 0) {
1623 if (waitqueue_active(sk_sleep(sk)))
1624 wake_up_interruptible(sk_sleep(sk));
1629 case SS_UNCONNECTED:
1630 /* Accept only SYN message */
1631 if (!msg_connected(msg) && !(msg_errcode(msg)))
1634 case SS_DISCONNECTING:
1637 pr_err("Unknown socket state %u\n", sock->state);
1643 * rcvbuf_limit - get proper overload limit of socket receive queue
1647 * For all connection oriented messages, irrespective of importance,
1648 * the default overload value (i.e. 67MB) is set as limit.
1650 * For all connectionless messages, by default new queue limits are
1653 * TIPC_LOW_IMPORTANCE (4 MB)
1654 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1655 * TIPC_HIGH_IMPORTANCE (16 MB)
1656 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1658 * Returns overload limit according to corresponding message importance
1660 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1662 struct tipc_msg *msg = buf_msg(buf);
1664 if (msg_connected(msg))
1665 return sysctl_tipc_rmem[2];
1667 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1668 msg_importance(msg);
1672 * filter_rcv - validate incoming message
1676 * Enqueues message on receive queue if acceptable; optionally handles
1677 * disconnect indication for a connected socket.
1679 * Called with socket lock already taken; port lock may also be taken.
1681 * Returns 0 (TIPC_OK) if message was consumed, -TIPC error code if message
1682 * to be rejected, 1 (TIPC_FWD_MSG) if (CONN_MANAGER) message to be forwarded
1684 static int filter_rcv(struct sock *sk, struct sk_buff *buf)
1686 struct socket *sock = sk->sk_socket;
1687 struct tipc_sock *tsk = tipc_sk(sk);
1688 struct tipc_msg *msg = buf_msg(buf);
1689 unsigned int limit = rcvbuf_limit(sk, buf);
1693 if (unlikely(msg_user(msg) == CONN_MANAGER))
1694 return tipc_sk_proto_rcv(tsk, &onode, buf);
1696 if (unlikely(msg_user(msg) == SOCK_WAKEUP)) {
1699 sk->sk_write_space(sk);
1703 /* Reject message if it is wrong sort of message for socket */
1704 if (msg_type(msg) > TIPC_DIRECT_MSG)
1705 return -TIPC_ERR_NO_PORT;
1707 if (sock->state == SS_READY) {
1708 if (msg_connected(msg))
1709 return -TIPC_ERR_NO_PORT;
1711 rc = filter_connect(tsk, &buf);
1712 if (rc != TIPC_OK || buf == NULL)
1716 /* Reject message if there isn't room to queue it */
1717 if (sk_rmem_alloc_get(sk) + buf->truesize >= limit)
1718 return -TIPC_ERR_OVERLOAD;
1720 /* Enqueue message */
1721 TIPC_SKB_CB(buf)->handle = NULL;
1722 __skb_queue_tail(&sk->sk_receive_queue, buf);
1723 skb_set_owner_r(buf, sk);
1725 sk->sk_data_ready(sk);
1730 * tipc_backlog_rcv - handle incoming message from backlog queue
1734 * Caller must hold socket lock, but not port lock.
1738 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf)
1742 struct tipc_sock *tsk = tipc_sk(sk);
1743 uint truesize = buf->truesize;
1745 rc = filter_rcv(sk, buf);
1748 if (atomic_read(&tsk->dupl_rcvcnt) < TIPC_CONN_OVERLOAD_LIMIT)
1749 atomic_add(truesize, &tsk->dupl_rcvcnt);
1753 if ((rc < 0) && !tipc_msg_reverse(buf, &onode, -rc))
1756 tipc_link_xmit(buf, onode, 0);
1762 * tipc_sk_rcv - handle incoming message
1763 * @buf: buffer containing arriving message
1765 * Returns 0 if success, or errno: -EHOSTUNREACH
1767 int tipc_sk_rcv(struct sk_buff *buf)
1769 struct tipc_sock *tsk;
1771 u32 dport = msg_destport(buf_msg(buf));
1776 /* Validate destination and message */
1777 tsk = tipc_sk_get(dport);
1778 if (unlikely(!tsk)) {
1779 rc = tipc_msg_eval(buf, &dnode);
1785 spin_lock_bh(&sk->sk_lock.slock);
1787 if (!sock_owned_by_user(sk)) {
1788 rc = filter_rcv(sk, buf);
1790 if (sk->sk_backlog.len == 0)
1791 atomic_set(&tsk->dupl_rcvcnt, 0);
1792 limit = rcvbuf_limit(sk, buf) + atomic_read(&tsk->dupl_rcvcnt);
1793 if (sk_add_backlog(sk, buf, limit))
1794 rc = -TIPC_ERR_OVERLOAD;
1796 spin_unlock_bh(&sk->sk_lock.slock);
1801 if ((rc < 0) && !tipc_msg_reverse(buf, &dnode, -rc))
1802 return -EHOSTUNREACH;
1804 tipc_link_xmit(buf, dnode, 0);
1805 return (rc < 0) ? -EHOSTUNREACH : 0;
1808 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1810 struct sock *sk = sock->sk;
1815 int err = sock_error(sk);
1820 if (signal_pending(current))
1821 return sock_intr_errno(*timeo_p);
1823 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1824 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1825 finish_wait(sk_sleep(sk), &wait);
1831 * tipc_connect - establish a connection to another TIPC port
1832 * @sock: socket structure
1833 * @dest: socket address for destination port
1834 * @destlen: size of socket address data structure
1835 * @flags: file-related flags associated with socket
1837 * Returns 0 on success, errno otherwise
1839 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1840 int destlen, int flags)
1842 struct sock *sk = sock->sk;
1843 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1844 struct msghdr m = {NULL,};
1845 long timeout = (flags & O_NONBLOCK) ? 0 : tipc_sk(sk)->conn_timeout;
1846 socket_state previous;
1851 /* For now, TIPC does not allow use of connect() with DGRAM/RDM types */
1852 if (sock->state == SS_READY) {
1858 * Reject connection attempt using multicast address
1860 * Note: send_msg() validates the rest of the address fields,
1861 * so there's no need to do it here
1863 if (dst->addrtype == TIPC_ADDR_MCAST) {
1868 previous = sock->state;
1869 switch (sock->state) {
1870 case SS_UNCONNECTED:
1871 /* Send a 'SYN-' to destination */
1873 m.msg_namelen = destlen;
1875 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1876 * indicate send_msg() is never blocked.
1879 m.msg_flags = MSG_DONTWAIT;
1881 res = tipc_sendmsg(NULL, sock, &m, 0);
1882 if ((res < 0) && (res != -EWOULDBLOCK))
1885 /* Just entered SS_CONNECTING state; the only
1886 * difference is that return value in non-blocking
1887 * case is EINPROGRESS, rather than EALREADY.
1891 if (previous == SS_CONNECTING)
1895 timeout = msecs_to_jiffies(timeout);
1896 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1897 res = tipc_wait_for_connect(sock, &timeout);
1912 * tipc_listen - allow socket to listen for incoming connections
1913 * @sock: socket structure
1916 * Returns 0 on success, errno otherwise
1918 static int tipc_listen(struct socket *sock, int len)
1920 struct sock *sk = sock->sk;
1925 if (sock->state != SS_UNCONNECTED)
1928 sock->state = SS_LISTENING;
1936 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1938 struct sock *sk = sock->sk;
1942 /* True wake-one mechanism for incoming connections: only
1943 * one process gets woken up, not the 'whole herd'.
1944 * Since we do not 'race & poll' for established sockets
1945 * anymore, the common case will execute the loop only once.
1948 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1949 TASK_INTERRUPTIBLE);
1950 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1952 timeo = schedule_timeout(timeo);
1956 if (!skb_queue_empty(&sk->sk_receive_queue))
1959 if (sock->state != SS_LISTENING)
1961 err = sock_intr_errno(timeo);
1962 if (signal_pending(current))
1968 finish_wait(sk_sleep(sk), &wait);
1973 * tipc_accept - wait for connection request
1974 * @sock: listening socket
1975 * @newsock: new socket that is to be connected
1976 * @flags: file-related flags associated with socket
1978 * Returns 0 on success, errno otherwise
1980 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1982 struct sock *new_sk, *sk = sock->sk;
1983 struct sk_buff *buf;
1984 struct tipc_sock *new_tsock;
1985 struct tipc_msg *msg;
1991 if (sock->state != SS_LISTENING) {
1995 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1996 res = tipc_wait_for_accept(sock, timeo);
2000 buf = skb_peek(&sk->sk_receive_queue);
2002 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
2006 new_sk = new_sock->sk;
2007 new_tsock = tipc_sk(new_sk);
2010 /* we lock on new_sk; but lockdep sees the lock on sk */
2011 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2014 * Reject any stray messages received by new socket
2015 * before the socket lock was taken (very, very unlikely)
2017 tsk_rej_rx_queue(new_sk);
2019 /* Connect new socket to it's peer */
2020 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2021 new_sock->state = SS_CONNECTED;
2023 tsk_set_importance(new_tsock, msg_importance(msg));
2024 if (msg_named(msg)) {
2025 new_tsock->conn_type = msg_nametype(msg);
2026 new_tsock->conn_instance = msg_nameinst(msg);
2030 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2031 * Respond to 'SYN+' by queuing it on new socket.
2033 if (!msg_data_sz(msg)) {
2034 struct msghdr m = {NULL,};
2036 tsk_advance_rx_queue(sk);
2037 tipc_send_packet(NULL, new_sock, &m, 0);
2039 __skb_dequeue(&sk->sk_receive_queue);
2040 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2041 skb_set_owner_r(buf, new_sk);
2043 release_sock(new_sk);
2050 * tipc_shutdown - shutdown socket connection
2051 * @sock: socket structure
2052 * @how: direction to close (must be SHUT_RDWR)
2054 * Terminates connection (if necessary), then purges socket's receive queue.
2056 * Returns 0 on success, errno otherwise
2058 static int tipc_shutdown(struct socket *sock, int how)
2060 struct sock *sk = sock->sk;
2061 struct tipc_sock *tsk = tipc_sk(sk);
2062 struct sk_buff *buf;
2066 if (how != SHUT_RDWR)
2071 switch (sock->state) {
2076 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
2077 buf = __skb_dequeue(&sk->sk_receive_queue);
2079 if (TIPC_SKB_CB(buf)->handle != NULL) {
2083 if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN))
2084 tipc_link_xmit(buf, dnode, tsk->ref);
2085 tipc_node_remove_conn(dnode, tsk->ref);
2087 dnode = tsk_peer_node(tsk);
2088 buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2089 TIPC_CONN_MSG, SHORT_H_SIZE,
2090 0, dnode, tipc_own_addr,
2092 tsk->ref, TIPC_CONN_SHUTDOWN);
2093 tipc_link_xmit(buf, dnode, tsk->ref);
2096 sock->state = SS_DISCONNECTING;
2097 tipc_node_remove_conn(dnode, tsk->ref);
2100 case SS_DISCONNECTING:
2102 /* Discard any unreceived messages */
2103 __skb_queue_purge(&sk->sk_receive_queue);
2105 /* Wake up anyone sleeping in poll */
2106 sk->sk_state_change(sk);
2118 static void tipc_sk_timeout(unsigned long ref)
2120 struct tipc_sock *tsk;
2122 struct sk_buff *buf = NULL;
2123 u32 peer_port, peer_node;
2125 tsk = tipc_sk_get(ref);
2131 if (!tsk->connected) {
2135 peer_port = tsk_peer_port(tsk);
2136 peer_node = tsk_peer_node(tsk);
2138 if (tsk->probing_state == TIPC_CONN_PROBING) {
2139 /* Previous probe not answered -> self abort */
2140 buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
2141 SHORT_H_SIZE, 0, tipc_own_addr,
2142 peer_node, ref, peer_port,
2145 buf = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE,
2146 0, peer_node, tipc_own_addr,
2147 peer_port, ref, TIPC_OK);
2148 tsk->probing_state = TIPC_CONN_PROBING;
2149 k_start_timer(&tsk->timer, tsk->probing_interval);
2153 tipc_link_xmit(buf, peer_node, ref);
2158 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2159 struct tipc_name_seq const *seq)
2161 struct publication *publ;
2166 key = tsk->ref + tsk->pub_count + 1;
2167 if (key == tsk->ref)
2170 publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
2171 scope, tsk->ref, key);
2172 if (unlikely(!publ))
2175 list_add(&publ->pport_list, &tsk->publications);
2181 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2182 struct tipc_name_seq const *seq)
2184 struct publication *publ;
2185 struct publication *safe;
2188 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2190 if (publ->scope != scope)
2192 if (publ->type != seq->type)
2194 if (publ->lower != seq->lower)
2196 if (publ->upper != seq->upper)
2198 tipc_nametbl_withdraw(publ->type, publ->lower,
2199 publ->ref, publ->key);
2203 tipc_nametbl_withdraw(publ->type, publ->lower,
2204 publ->ref, publ->key);
2207 if (list_empty(&tsk->publications))
2212 static int tipc_sk_show(struct tipc_sock *tsk, char *buf,
2213 int len, int full_id)
2215 struct publication *publ;
2219 ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
2220 tipc_zone(tipc_own_addr),
2221 tipc_cluster(tipc_own_addr),
2222 tipc_node(tipc_own_addr), tsk->ref);
2224 ret = tipc_snprintf(buf, len, "%-10u:", tsk->ref);
2226 if (tsk->connected) {
2227 u32 dport = tsk_peer_port(tsk);
2228 u32 destnode = tsk_peer_node(tsk);
2230 ret += tipc_snprintf(buf + ret, len - ret,
2231 " connected to <%u.%u.%u:%u>",
2232 tipc_zone(destnode),
2233 tipc_cluster(destnode),
2234 tipc_node(destnode), dport);
2235 if (tsk->conn_type != 0)
2236 ret += tipc_snprintf(buf + ret, len - ret,
2237 " via {%u,%u}", tsk->conn_type,
2238 tsk->conn_instance);
2239 } else if (tsk->published) {
2240 ret += tipc_snprintf(buf + ret, len - ret, " bound to");
2241 list_for_each_entry(publ, &tsk->publications, pport_list) {
2242 if (publ->lower == publ->upper)
2243 ret += tipc_snprintf(buf + ret, len - ret,
2244 " {%u,%u}", publ->type,
2247 ret += tipc_snprintf(buf + ret, len - ret,
2248 " {%u,%u,%u}", publ->type,
2249 publ->lower, publ->upper);
2252 ret += tipc_snprintf(buf + ret, len - ret, "\n");
2256 struct sk_buff *tipc_sk_socks_show(void)
2258 struct sk_buff *buf;
2259 struct tlv_desc *rep_tlv;
2262 struct tipc_sock *tsk;
2266 buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
2269 rep_tlv = (struct tlv_desc *)buf->data;
2270 pb = TLV_DATA(rep_tlv);
2271 pb_len = ULTRA_STRING_MAX_LEN;
2273 tsk = tipc_sk_get_next(&ref);
2274 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2275 lock_sock(&tsk->sk);
2276 str_len += tipc_sk_show(tsk, pb + str_len,
2277 pb_len - str_len, 0);
2278 release_sock(&tsk->sk);
2281 str_len += 1; /* for "\0" */
2282 skb_put(buf, TLV_SPACE(str_len));
2283 TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
2288 /* tipc_sk_reinit: set non-zero address in all existing sockets
2289 * when we go from standalone to network mode.
2291 void tipc_sk_reinit(void)
2293 struct tipc_msg *msg;
2295 struct tipc_sock *tsk = tipc_sk_get_next(&ref);
2297 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2298 lock_sock(&tsk->sk);
2300 msg_set_prevnode(msg, tipc_own_addr);
2301 msg_set_orignode(msg, tipc_own_addr);
2302 release_sock(&tsk->sk);
2308 * struct reference - TIPC socket reference entry
2309 * @tsk: pointer to socket associated with reference entry
2310 * @ref: reference value for socket (combines instance & array index info)
2313 struct tipc_sock *tsk;
2318 * struct tipc_ref_table - table of TIPC socket reference entries
2319 * @entries: pointer to array of reference entries
2320 * @capacity: array index of first unusable entry
2321 * @init_point: array index of first uninitialized entry
2322 * @first_free: array index of first unused socket reference entry
2323 * @last_free: array index of last unused socket reference entry
2324 * @index_mask: bitmask for array index portion of reference values
2325 * @start_mask: initial value for instance value portion of reference values
2328 struct reference *entries;
2337 /* Socket reference table consists of 2**N entries.
2339 * State Socket ptr Reference
2340 * ----- ---------- ---------
2341 * In use non-NULL XXXX|own index
2342 * (XXXX changes each time entry is acquired)
2343 * Free NULL YYYY|next free index
2344 * (YYYY is one more than last used XXXX)
2345 * Uninitialized NULL 0
2347 * Entry 0 is not used; this allows index 0 to denote the end of the free list.
2349 * Note that a reference value of 0 does not necessarily indicate that an
2350 * entry is uninitialized, since the last entry in the free list could also
2351 * have a reference value of 0 (although this is unlikely).
2354 static struct ref_table tipc_ref_table;
2356 static DEFINE_RWLOCK(ref_table_lock);
2359 * tipc_ref_table_init - create reference table for sockets
2361 int tipc_sk_ref_table_init(u32 req_sz, u32 start)
2363 struct reference *table;
2366 /* account for unused entry, then round up size to a power of 2 */
2369 for (actual_sz = 16; actual_sz < req_sz; actual_sz <<= 1) {
2373 /* allocate table & mark all entries as uninitialized */
2374 table = vzalloc(actual_sz * sizeof(struct reference));
2378 tipc_ref_table.entries = table;
2379 tipc_ref_table.capacity = req_sz;
2380 tipc_ref_table.init_point = 1;
2381 tipc_ref_table.first_free = 0;
2382 tipc_ref_table.last_free = 0;
2383 tipc_ref_table.index_mask = actual_sz - 1;
2384 tipc_ref_table.start_mask = start & ~tipc_ref_table.index_mask;
2390 * tipc_ref_table_stop - destroy reference table for sockets
2392 void tipc_sk_ref_table_stop(void)
2394 if (!tipc_ref_table.entries)
2396 vfree(tipc_ref_table.entries);
2397 tipc_ref_table.entries = NULL;
2400 /* tipc_ref_acquire - create reference to a socket
2402 * Register an socket pointer in the reference table.
2403 * Returns a unique reference value that is used from then on to retrieve the
2404 * socket pointer, or to determine if the socket has been deregistered.
2406 u32 tipc_sk_ref_acquire(struct tipc_sock *tsk)
2410 u32 next_plus_upper;
2412 struct reference *entry;
2414 if (unlikely(!tsk)) {
2415 pr_err("Attempt to acquire ref. to non-existent obj\n");
2418 if (unlikely(!tipc_ref_table.entries)) {
2419 pr_err("Ref. table not found in acquisition attempt\n");
2423 /* Take a free entry, if available; otherwise initialize a new one */
2424 write_lock_bh(&ref_table_lock);
2425 index = tipc_ref_table.first_free;
2426 entry = &tipc_ref_table.entries[index];
2428 if (likely(index)) {
2429 index = tipc_ref_table.first_free;
2430 entry = &tipc_ref_table.entries[index];
2431 index_mask = tipc_ref_table.index_mask;
2432 next_plus_upper = entry->ref;
2433 tipc_ref_table.first_free = next_plus_upper & index_mask;
2434 ref = (next_plus_upper & ~index_mask) + index;
2436 } else if (tipc_ref_table.init_point < tipc_ref_table.capacity) {
2437 index = tipc_ref_table.init_point++;
2438 entry = &tipc_ref_table.entries[index];
2439 ref = tipc_ref_table.start_mask + index;
2446 write_unlock_bh(&ref_table_lock);
2450 /* tipc_sk_ref_discard - invalidate reference to an socket
2452 * Disallow future references to an socket and free up the entry for re-use.
2454 void tipc_sk_ref_discard(u32 ref)
2456 struct reference *entry;
2460 if (unlikely(!tipc_ref_table.entries)) {
2461 pr_err("Ref. table not found during discard attempt\n");
2465 index_mask = tipc_ref_table.index_mask;
2466 index = ref & index_mask;
2467 entry = &tipc_ref_table.entries[index];
2469 write_lock_bh(&ref_table_lock);
2471 if (unlikely(!entry->tsk)) {
2472 pr_err("Attempt to discard ref. to non-existent socket\n");
2475 if (unlikely(entry->ref != ref)) {
2476 pr_err("Attempt to discard non-existent reference\n");
2480 /* Mark entry as unused; increment instance part of entry's
2481 * reference to invalidate any subsequent references
2485 entry->ref = (ref & ~index_mask) + (index_mask + 1);
2487 /* Append entry to free entry list */
2488 if (unlikely(tipc_ref_table.first_free == 0))
2489 tipc_ref_table.first_free = index;
2491 tipc_ref_table.entries[tipc_ref_table.last_free].ref |= index;
2492 tipc_ref_table.last_free = index;
2494 write_unlock_bh(&ref_table_lock);
2497 /* tipc_sk_get - find referenced socket and return pointer to it
2499 struct tipc_sock *tipc_sk_get(u32 ref)
2501 struct reference *entry;
2502 struct tipc_sock *tsk;
2504 if (unlikely(!tipc_ref_table.entries))
2506 read_lock_bh(&ref_table_lock);
2507 entry = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
2509 if (likely(tsk && (entry->ref == ref)))
2510 sock_hold(&tsk->sk);
2513 read_unlock_bh(&ref_table_lock);
2517 /* tipc_sk_get_next - lock & return next socket after referenced one
2519 struct tipc_sock *tipc_sk_get_next(u32 *ref)
2521 struct reference *entry;
2522 struct tipc_sock *tsk = NULL;
2523 uint index = *ref & tipc_ref_table.index_mask;
2525 read_lock_bh(&ref_table_lock);
2526 while (++index < tipc_ref_table.capacity) {
2527 entry = &tipc_ref_table.entries[index];
2531 sock_hold(&tsk->sk);
2535 read_unlock_bh(&ref_table_lock);
2539 static void tipc_sk_put(struct tipc_sock *tsk)
2545 * tipc_setsockopt - set socket option
2546 * @sock: socket structure
2547 * @lvl: option level
2548 * @opt: option identifier
2549 * @ov: pointer to new option value
2550 * @ol: length of option value
2552 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2553 * (to ease compatibility).
2555 * Returns 0 on success, errno otherwise
2557 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2558 char __user *ov, unsigned int ol)
2560 struct sock *sk = sock->sk;
2561 struct tipc_sock *tsk = tipc_sk(sk);
2565 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2567 if (lvl != SOL_TIPC)
2568 return -ENOPROTOOPT;
2569 if (ol < sizeof(value))
2571 res = get_user(value, (u32 __user *)ov);
2578 case TIPC_IMPORTANCE:
2579 res = tsk_set_importance(tsk, value);
2581 case TIPC_SRC_DROPPABLE:
2582 if (sock->type != SOCK_STREAM)
2583 tsk_set_unreliable(tsk, value);
2587 case TIPC_DEST_DROPPABLE:
2588 tsk_set_unreturnable(tsk, value);
2590 case TIPC_CONN_TIMEOUT:
2591 tipc_sk(sk)->conn_timeout = value;
2592 /* no need to set "res", since already 0 at this point */
2604 * tipc_getsockopt - get socket option
2605 * @sock: socket structure
2606 * @lvl: option level
2607 * @opt: option identifier
2608 * @ov: receptacle for option value
2609 * @ol: receptacle for length of option value
2611 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2612 * (to ease compatibility).
2614 * Returns 0 on success, errno otherwise
2616 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2617 char __user *ov, int __user *ol)
2619 struct sock *sk = sock->sk;
2620 struct tipc_sock *tsk = tipc_sk(sk);
2625 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2626 return put_user(0, ol);
2627 if (lvl != SOL_TIPC)
2628 return -ENOPROTOOPT;
2629 res = get_user(len, ol);
2636 case TIPC_IMPORTANCE:
2637 value = tsk_importance(tsk);
2639 case TIPC_SRC_DROPPABLE:
2640 value = tsk_unreliable(tsk);
2642 case TIPC_DEST_DROPPABLE:
2643 value = tsk_unreturnable(tsk);
2645 case TIPC_CONN_TIMEOUT:
2646 value = tsk->conn_timeout;
2647 /* no need to set "res", since already 0 at this point */
2649 case TIPC_NODE_RECVQ_DEPTH:
2650 value = 0; /* was tipc_queue_size, now obsolete */
2652 case TIPC_SOCK_RECVQ_DEPTH:
2653 value = skb_queue_len(&sk->sk_receive_queue);
2662 return res; /* "get" failed */
2664 if (len < sizeof(value))
2667 if (copy_to_user(ov, &value, sizeof(value)))
2670 return put_user(sizeof(value), ol);
2673 static int tipc_ioctl(struct socket *sk, unsigned int cmd, unsigned long arg)
2675 struct tipc_sioc_ln_req lnr;
2676 void __user *argp = (void __user *)arg;
2679 case SIOCGETLINKNAME:
2680 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2682 if (!tipc_node_get_linkname(lnr.bearer_id & 0xffff, lnr.peer,
2683 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2684 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2688 return -EADDRNOTAVAIL;
2690 return -ENOIOCTLCMD;
2694 /* Protocol switches for the various types of TIPC sockets */
2696 static const struct proto_ops msg_ops = {
2697 .owner = THIS_MODULE,
2699 .release = tipc_release,
2701 .connect = tipc_connect,
2702 .socketpair = sock_no_socketpair,
2703 .accept = sock_no_accept,
2704 .getname = tipc_getname,
2706 .ioctl = tipc_ioctl,
2707 .listen = sock_no_listen,
2708 .shutdown = tipc_shutdown,
2709 .setsockopt = tipc_setsockopt,
2710 .getsockopt = tipc_getsockopt,
2711 .sendmsg = tipc_sendmsg,
2712 .recvmsg = tipc_recvmsg,
2713 .mmap = sock_no_mmap,
2714 .sendpage = sock_no_sendpage
2717 static const struct proto_ops packet_ops = {
2718 .owner = THIS_MODULE,
2720 .release = tipc_release,
2722 .connect = tipc_connect,
2723 .socketpair = sock_no_socketpair,
2724 .accept = tipc_accept,
2725 .getname = tipc_getname,
2727 .ioctl = tipc_ioctl,
2728 .listen = tipc_listen,
2729 .shutdown = tipc_shutdown,
2730 .setsockopt = tipc_setsockopt,
2731 .getsockopt = tipc_getsockopt,
2732 .sendmsg = tipc_send_packet,
2733 .recvmsg = tipc_recvmsg,
2734 .mmap = sock_no_mmap,
2735 .sendpage = sock_no_sendpage
2738 static const struct proto_ops stream_ops = {
2739 .owner = THIS_MODULE,
2741 .release = tipc_release,
2743 .connect = tipc_connect,
2744 .socketpair = sock_no_socketpair,
2745 .accept = tipc_accept,
2746 .getname = tipc_getname,
2748 .ioctl = tipc_ioctl,
2749 .listen = tipc_listen,
2750 .shutdown = tipc_shutdown,
2751 .setsockopt = tipc_setsockopt,
2752 .getsockopt = tipc_getsockopt,
2753 .sendmsg = tipc_send_stream,
2754 .recvmsg = tipc_recv_stream,
2755 .mmap = sock_no_mmap,
2756 .sendpage = sock_no_sendpage
2759 static const struct net_proto_family tipc_family_ops = {
2760 .owner = THIS_MODULE,
2762 .create = tipc_sk_create
2765 static struct proto tipc_proto = {
2767 .owner = THIS_MODULE,
2768 .obj_size = sizeof(struct tipc_sock),
2769 .sysctl_rmem = sysctl_tipc_rmem
2772 static struct proto tipc_proto_kern = {
2774 .obj_size = sizeof(struct tipc_sock),
2775 .sysctl_rmem = sysctl_tipc_rmem
2779 * tipc_socket_init - initialize TIPC socket interface
2781 * Returns 0 on success, errno otherwise
2783 int tipc_socket_init(void)
2787 res = proto_register(&tipc_proto, 1);
2789 pr_err("Failed to register TIPC protocol type\n");
2793 res = sock_register(&tipc_family_ops);
2795 pr_err("Failed to register TIPC socket type\n");
2796 proto_unregister(&tipc_proto);
2804 * tipc_socket_stop - stop TIPC socket interface
2806 void tipc_socket_stop(void)
2808 sock_unregister(tipc_family_ops.family);
2809 proto_unregister(&tipc_proto);
2812 /* Caller should hold socket lock for the passed tipc socket. */
2813 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
2817 struct nlattr *nest;
2819 peer_node = tsk_peer_node(tsk);
2820 peer_port = tsk_peer_port(tsk);
2822 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
2824 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
2826 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
2829 if (tsk->conn_type != 0) {
2830 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
2832 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
2834 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
2837 nla_nest_end(skb, nest);
2842 nla_nest_cancel(skb, nest);
2847 /* Caller should hold socket lock for the passed tipc socket. */
2848 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
2849 struct tipc_sock *tsk)
2853 struct nlattr *attrs;
2855 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2856 &tipc_genl_v2_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
2860 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
2862 goto genlmsg_cancel;
2863 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->ref))
2864 goto attr_msg_cancel;
2865 if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr))
2866 goto attr_msg_cancel;
2868 if (tsk->connected) {
2869 err = __tipc_nl_add_sk_con(skb, tsk);
2871 goto attr_msg_cancel;
2872 } else if (!list_empty(&tsk->publications)) {
2873 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
2874 goto attr_msg_cancel;
2876 nla_nest_end(skb, attrs);
2877 genlmsg_end(skb, hdr);
2882 nla_nest_cancel(skb, attrs);
2884 genlmsg_cancel(skb, hdr);
2889 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
2892 struct tipc_sock *tsk;
2893 u32 prev_ref = cb->args[0];
2896 tsk = tipc_sk_get_next(&ref);
2897 for (; tsk; tsk = tipc_sk_get_next(&ref)) {
2898 lock_sock(&tsk->sk);
2899 err = __tipc_nl_add_sk(skb, cb, tsk);
2900 release_sock(&tsk->sk);
2908 cb->args[0] = prev_ref;
2913 /* Caller should hold socket lock for the passed tipc socket. */
2914 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
2915 struct netlink_callback *cb,
2916 struct publication *publ)
2919 struct nlattr *attrs;
2921 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2922 &tipc_genl_v2_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
2926 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
2928 goto genlmsg_cancel;
2930 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
2931 goto attr_msg_cancel;
2932 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
2933 goto attr_msg_cancel;
2934 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
2935 goto attr_msg_cancel;
2936 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
2937 goto attr_msg_cancel;
2939 nla_nest_end(skb, attrs);
2940 genlmsg_end(skb, hdr);
2945 nla_nest_cancel(skb, attrs);
2947 genlmsg_cancel(skb, hdr);
2952 /* Caller should hold socket lock for the passed tipc socket. */
2953 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
2954 struct netlink_callback *cb,
2955 struct tipc_sock *tsk, u32 *last_publ)
2958 struct publication *p;
2961 list_for_each_entry(p, &tsk->publications, pport_list) {
2962 if (p->key == *last_publ)
2965 if (p->key != *last_publ) {
2966 /* We never set seq or call nl_dump_check_consistent()
2967 * this means that setting prev_seq here will cause the
2968 * consistence check to fail in the netlink callback
2969 * handler. Resulting in the last NLMSG_DONE message
2970 * having the NLM_F_DUMP_INTR flag set.
2977 p = list_first_entry(&tsk->publications, struct publication,
2981 list_for_each_entry_from(p, &tsk->publications, pport_list) {
2982 err = __tipc_nl_add_sk_publ(skb, cb, p);
2984 *last_publ = p->key;
2993 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
2996 u32 tsk_ref = cb->args[0];
2997 u32 last_publ = cb->args[1];
2998 u32 done = cb->args[2];
2999 struct tipc_sock *tsk;
3002 struct nlattr **attrs;
3003 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3005 err = tipc_nlmsg_parse(cb->nlh, &attrs);
3009 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
3010 attrs[TIPC_NLA_SOCK],
3011 tipc_nl_sock_policy);
3015 if (!sock[TIPC_NLA_SOCK_REF])
3018 tsk_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3024 tsk = tipc_sk_get(tsk_ref);
3028 lock_sock(&tsk->sk);
3029 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3032 release_sock(&tsk->sk);
3035 cb->args[0] = tsk_ref;
3036 cb->args[1] = last_publ;