2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2015, 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.
37 #include <linux/rhashtable.h>
39 #include "name_table.h"
42 #include "name_distr.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 msecs_to_jiffies(3600000) /* [ms] => 1 h */
50 #define TIPC_FWD_MSG 1
51 #define TIPC_CONN_OK 0
52 #define TIPC_CONN_PROBING 1
53 #define TIPC_MAX_PORT 0xffffffff
54 #define TIPC_MIN_PORT 1
57 * struct tipc_sock - TIPC socket structure
58 * @sk: socket - interacts with 'port' and with user via the socket API
59 * @connected: non-zero if port is currently connected to a peer port
60 * @conn_type: TIPC type used when connection was established
61 * @conn_instance: TIPC instance used when connection was established
62 * @published: non-zero if port has one or more associated names
63 * @max_pkt: maximum packet size "hint" used when building messages sent by port
64 * @portid: unique port identity in TIPC socket hash table
65 * @phdr: preformatted message header used when sending messages
66 * @port_list: adjacent ports in TIPC's global list of ports
67 * @publications: list of publications for port
68 * @pub_count: total # of publications port has made during its lifetime
71 * @conn_timeout: the time we can wait for an unresponded setup request
72 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
73 * @link_cong: non-zero if owner must sleep because of link congestion
74 * @sent_unacked: # messages sent by socket, and not yet acked by peer
75 * @rcv_unacked: # messages read by user, but not yet acked back to peer
76 * @remote: 'connected' peer for dgram/rdm
77 * @node: hash table node
78 * @rcu: rcu struct for tipc_sock
89 struct list_head sock_list;
90 struct list_head publications;
93 unsigned long probing_intv;
99 struct sockaddr_tipc remote;
100 struct rhash_head node;
104 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
105 static void tipc_data_ready(struct sock *sk);
106 static void tipc_write_space(struct sock *sk);
107 static int tipc_release(struct socket *sock);
108 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
109 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
110 static void tipc_sk_timeout(unsigned long data);
111 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
112 struct tipc_name_seq const *seq);
113 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
114 struct tipc_name_seq const *seq);
115 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
116 static int tipc_sk_insert(struct tipc_sock *tsk);
117 static void tipc_sk_remove(struct tipc_sock *tsk);
118 static int __tipc_send_stream(struct socket *sock, struct msghdr *m,
120 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
122 static const struct proto_ops packet_ops;
123 static const struct proto_ops stream_ops;
124 static const struct proto_ops msg_ops;
125 static struct proto tipc_proto;
127 static const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
128 [TIPC_NLA_SOCK_UNSPEC] = { .type = NLA_UNSPEC },
129 [TIPC_NLA_SOCK_ADDR] = { .type = NLA_U32 },
130 [TIPC_NLA_SOCK_REF] = { .type = NLA_U32 },
131 [TIPC_NLA_SOCK_CON] = { .type = NLA_NESTED },
132 [TIPC_NLA_SOCK_HAS_PUBL] = { .type = NLA_FLAG }
135 static const struct rhashtable_params tsk_rht_params;
138 * Revised TIPC socket locking policy:
140 * Most socket operations take the standard socket lock when they start
141 * and hold it until they finish (or until they need to sleep). Acquiring
142 * this lock grants the owner exclusive access to the fields of the socket
143 * data structures, with the exception of the backlog queue. A few socket
144 * operations can be done without taking the socket lock because they only
145 * read socket information that never changes during the life of the socket.
147 * Socket operations may acquire the lock for the associated TIPC port if they
148 * need to perform an operation on the port. If any routine needs to acquire
149 * both the socket lock and the port lock it must take the socket lock first
150 * to avoid the risk of deadlock.
152 * The dispatcher handling incoming messages cannot grab the socket lock in
153 * the standard fashion, since invoked it runs at the BH level and cannot block.
154 * Instead, it checks to see if the socket lock is currently owned by someone,
155 * and either handles the message itself or adds it to the socket's backlog
156 * queue; in the latter case the queued message is processed once the process
157 * owning the socket lock releases it.
159 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
160 * the problem of a blocked socket operation preventing any other operations
161 * from occurring. However, applications must be careful if they have
162 * multiple threads trying to send (or receive) on the same socket, as these
163 * operations might interfere with each other. For example, doing a connect
164 * and a receive at the same time might allow the receive to consume the
165 * ACK message meant for the connect. While additional work could be done
166 * to try and overcome this, it doesn't seem to be worthwhile at the present.
168 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
169 * that another operation that must be performed in a non-blocking manner is
170 * not delayed for very long because the lock has already been taken.
172 * NOTE: This code assumes that certain fields of a port/socket pair are
173 * constant over its lifetime; such fields can be examined without taking
174 * the socket lock and/or port lock, and do not need to be re-read even
175 * after resuming processing after waiting. These fields include:
177 * - pointer to socket sk structure (aka tipc_sock structure)
178 * - pointer to port structure
182 static u32 tsk_own_node(struct tipc_sock *tsk)
184 return msg_prevnode(&tsk->phdr);
187 static u32 tsk_peer_node(struct tipc_sock *tsk)
189 return msg_destnode(&tsk->phdr);
192 static u32 tsk_peer_port(struct tipc_sock *tsk)
194 return msg_destport(&tsk->phdr);
197 static bool tsk_unreliable(struct tipc_sock *tsk)
199 return msg_src_droppable(&tsk->phdr) != 0;
202 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
204 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
207 static bool tsk_unreturnable(struct tipc_sock *tsk)
209 return msg_dest_droppable(&tsk->phdr) != 0;
212 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
214 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
217 static int tsk_importance(struct tipc_sock *tsk)
219 return msg_importance(&tsk->phdr);
222 static int tsk_set_importance(struct tipc_sock *tsk, int imp)
224 if (imp > TIPC_CRITICAL_IMPORTANCE)
226 msg_set_importance(&tsk->phdr, (u32)imp);
230 static struct tipc_sock *tipc_sk(const struct sock *sk)
232 return container_of(sk, struct tipc_sock, sk);
235 static int tsk_conn_cong(struct tipc_sock *tsk)
237 return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
241 * tsk_advance_rx_queue - discard first buffer in socket receive queue
243 * Caller must hold socket lock
245 static void tsk_advance_rx_queue(struct sock *sk)
247 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
251 * tsk_rej_rx_queue - reject all buffers in socket receive queue
253 * Caller must hold socket lock
255 static void tsk_rej_rx_queue(struct sock *sk)
259 u32 own_node = tsk_own_node(tipc_sk(sk));
261 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) {
262 if (tipc_msg_reverse(own_node, skb, &dnode, TIPC_ERR_NO_PORT))
263 tipc_link_xmit_skb(sock_net(sk), skb, dnode, 0);
267 /* tsk_peer_msg - verify if message was sent by connected port's peer
269 * Handles cases where the node's network address has changed from
270 * the default of <0.0.0> to its configured setting.
272 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
274 struct tipc_net *tn = net_generic(sock_net(&tsk->sk), tipc_net_id);
275 u32 peer_port = tsk_peer_port(tsk);
279 if (unlikely(!tsk->connected))
282 if (unlikely(msg_origport(msg) != peer_port))
285 orig_node = msg_orignode(msg);
286 peer_node = tsk_peer_node(tsk);
288 if (likely(orig_node == peer_node))
291 if (!orig_node && (peer_node == tn->own_addr))
294 if (!peer_node && (orig_node == tn->own_addr))
301 * tipc_sk_create - create a TIPC socket
302 * @net: network namespace (must be default network)
303 * @sock: pre-allocated socket structure
304 * @protocol: protocol indicator (must be 0)
305 * @kern: caused by kernel or by userspace?
307 * This routine creates additional data structures used by the TIPC socket,
308 * initializes them, and links them together.
310 * Returns 0 on success, errno otherwise
312 static int tipc_sk_create(struct net *net, struct socket *sock,
313 int protocol, int kern)
316 const struct proto_ops *ops;
319 struct tipc_sock *tsk;
320 struct tipc_msg *msg;
322 /* Validate arguments */
323 if (unlikely(protocol != 0))
324 return -EPROTONOSUPPORT;
326 switch (sock->type) {
329 state = SS_UNCONNECTED;
333 state = SS_UNCONNECTED;
344 /* Allocate socket's protocol area */
345 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
350 tsk->max_pkt = MAX_PKT_DEFAULT;
351 INIT_LIST_HEAD(&tsk->publications);
353 tn = net_generic(sock_net(sk), tipc_net_id);
354 tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
357 /* Finish initializing socket data structures */
360 sock_init_data(sock, sk);
361 if (tipc_sk_insert(tsk)) {
362 pr_warn("Socket create failed; port numbrer exhausted\n");
365 msg_set_origport(msg, tsk->portid);
366 setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk);
367 sk->sk_backlog_rcv = tipc_backlog_rcv;
368 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
369 sk->sk_data_ready = tipc_data_ready;
370 sk->sk_write_space = tipc_write_space;
371 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
372 tsk->sent_unacked = 0;
373 atomic_set(&tsk->dupl_rcvcnt, 0);
375 if (sock->state == SS_READY) {
376 tsk_set_unreturnable(tsk, true);
377 if (sock->type == SOCK_DGRAM)
378 tsk_set_unreliable(tsk, true);
383 static void tipc_sk_callback(struct rcu_head *head)
385 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
391 * tipc_release - destroy a TIPC socket
392 * @sock: socket to destroy
394 * This routine cleans up any messages that are still queued on the socket.
395 * For DGRAM and RDM socket types, all queued messages are rejected.
396 * For SEQPACKET and STREAM socket types, the first message is rejected
397 * and any others are discarded. (If the first message on a STREAM socket
398 * is partially-read, it is discarded and the next one is rejected instead.)
400 * NOTE: Rejected messages are not necessarily returned to the sender! They
401 * are returned or discarded according to the "destination droppable" setting
402 * specified for the message by the sender.
404 * Returns 0 on success, errno otherwise
406 static int tipc_release(struct socket *sock)
408 struct sock *sk = sock->sk;
410 struct tipc_sock *tsk;
412 u32 dnode, probing_state;
415 * Exit if socket isn't fully initialized (occurs when a failed accept()
416 * releases a pre-allocated child socket that was never used)
426 * Reject all unreceived messages, except on an active connection
427 * (which disconnects locally & sends a 'FIN+' to peer)
429 dnode = tsk_peer_node(tsk);
430 while (sock->state != SS_DISCONNECTING) {
431 skb = __skb_dequeue(&sk->sk_receive_queue);
434 if (TIPC_SKB_CB(skb)->handle != NULL)
437 if ((sock->state == SS_CONNECTING) ||
438 (sock->state == SS_CONNECTED)) {
439 sock->state = SS_DISCONNECTING;
441 tipc_node_remove_conn(net, dnode, tsk->portid);
443 if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode,
445 tipc_link_xmit_skb(net, skb, dnode, 0);
449 tipc_sk_withdraw(tsk, 0, NULL);
450 probing_state = tsk->probing_state;
451 if (del_timer_sync(&sk->sk_timer) &&
452 probing_state != TIPC_CONN_PROBING)
455 if (tsk->connected) {
456 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
457 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
458 tsk_own_node(tsk), tsk_peer_port(tsk),
459 tsk->portid, TIPC_ERR_NO_PORT);
461 tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
462 tipc_node_remove_conn(net, dnode, tsk->portid);
465 /* Discard any remaining (connection-based) messages in receive queue */
466 __skb_queue_purge(&sk->sk_receive_queue);
468 /* Reject any messages that accumulated in backlog queue */
469 sock->state = SS_DISCONNECTING;
472 call_rcu(&tsk->rcu, tipc_sk_callback);
479 * tipc_bind - associate or disassocate TIPC name(s) with a socket
480 * @sock: socket structure
481 * @uaddr: socket address describing name(s) and desired operation
482 * @uaddr_len: size of socket address data structure
484 * Name and name sequence binding is indicated using a positive scope value;
485 * a negative scope value unbinds the specified name. Specifying no name
486 * (i.e. a socket address length of 0) unbinds all names from the socket.
488 * Returns 0 on success, errno otherwise
490 * NOTE: This routine doesn't need to take the socket lock since it doesn't
491 * access any non-constant socket information.
493 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
496 struct sock *sk = sock->sk;
497 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
498 struct tipc_sock *tsk = tipc_sk(sk);
502 if (unlikely(!uaddr_len)) {
503 res = tipc_sk_withdraw(tsk, 0, NULL);
507 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
511 if (addr->family != AF_TIPC) {
516 if (addr->addrtype == TIPC_ADDR_NAME)
517 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
518 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
523 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
524 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
525 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
530 res = (addr->scope > 0) ?
531 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
532 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
539 * tipc_getname - get port ID of socket or peer socket
540 * @sock: socket structure
541 * @uaddr: area for returned socket address
542 * @uaddr_len: area for returned length of socket address
543 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
545 * Returns 0 on success, errno otherwise
547 * NOTE: This routine doesn't need to take the socket lock since it only
548 * accesses socket information that is unchanging (or which changes in
549 * a completely predictable manner).
551 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
552 int *uaddr_len, int peer)
554 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
555 struct tipc_sock *tsk = tipc_sk(sock->sk);
556 struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id);
558 memset(addr, 0, sizeof(*addr));
560 if ((sock->state != SS_CONNECTED) &&
561 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
563 addr->addr.id.ref = tsk_peer_port(tsk);
564 addr->addr.id.node = tsk_peer_node(tsk);
566 addr->addr.id.ref = tsk->portid;
567 addr->addr.id.node = tn->own_addr;
570 *uaddr_len = sizeof(*addr);
571 addr->addrtype = TIPC_ADDR_ID;
572 addr->family = AF_TIPC;
574 addr->addr.name.domain = 0;
580 * tipc_poll - read and possibly block on pollmask
581 * @file: file structure associated with the socket
582 * @sock: socket for which to calculate the poll bits
585 * Returns pollmask value
588 * It appears that the usual socket locking mechanisms are not useful here
589 * since the pollmask info is potentially out-of-date the moment this routine
590 * exits. TCP and other protocols seem to rely on higher level poll routines
591 * to handle any preventable race conditions, so TIPC will do the same ...
593 * TIPC sets the returned events as follows:
595 * socket state flags set
596 * ------------ ---------
597 * unconnected no read flags
598 * POLLOUT if port is not congested
600 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
603 * connected POLLIN/POLLRDNORM if data in rx queue
604 * POLLOUT if port is not congested
606 * disconnecting POLLIN/POLLRDNORM/POLLHUP
609 * listening POLLIN if SYN in rx queue
612 * ready POLLIN/POLLRDNORM if data in rx queue
613 * [connectionless] POLLOUT (since port cannot be congested)
615 * IMPORTANT: The fact that a read or write operation is indicated does NOT
616 * imply that the operation will succeed, merely that it should be performed
617 * and will not block.
619 static unsigned int tipc_poll(struct file *file, struct socket *sock,
622 struct sock *sk = sock->sk;
623 struct tipc_sock *tsk = tipc_sk(sk);
626 sock_poll_wait(file, sk_sleep(sk), wait);
628 switch ((int)sock->state) {
635 if (!tsk->link_cong && !tsk_conn_cong(tsk))
640 if (!skb_queue_empty(&sk->sk_receive_queue))
641 mask |= (POLLIN | POLLRDNORM);
643 case SS_DISCONNECTING:
644 mask = (POLLIN | POLLRDNORM | POLLHUP);
652 * tipc_sendmcast - send multicast message
653 * @sock: socket structure
654 * @seq: destination address
655 * @msg: message to send
656 * @dsz: total length of message data
657 * @timeo: timeout to wait for wakeup
659 * Called from function tipc_sendmsg(), which has done all sanity checks
660 * Returns the number of bytes sent on success, or errno
662 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
663 struct msghdr *msg, size_t dsz, long timeo)
665 struct sock *sk = sock->sk;
666 struct tipc_sock *tsk = tipc_sk(sk);
667 struct net *net = sock_net(sk);
668 struct tipc_msg *mhdr = &tsk->phdr;
669 struct sk_buff_head *pktchain = &sk->sk_write_queue;
670 struct iov_iter save = msg->msg_iter;
674 msg_set_type(mhdr, TIPC_MCAST_MSG);
675 msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
676 msg_set_destport(mhdr, 0);
677 msg_set_destnode(mhdr, 0);
678 msg_set_nametype(mhdr, seq->type);
679 msg_set_namelower(mhdr, seq->lower);
680 msg_set_nameupper(mhdr, seq->upper);
681 msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
684 mtu = tipc_bclink_get_mtu();
685 rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, pktchain);
686 if (unlikely(rc < 0))
690 rc = tipc_bclink_xmit(net, pktchain);
691 if (likely(rc >= 0)) {
695 if (rc == -EMSGSIZE) {
696 msg->msg_iter = save;
699 if (rc != -ELINKCONG)
701 tipc_sk(sk)->link_cong = 1;
702 rc = tipc_wait_for_sndmsg(sock, &timeo);
704 __skb_queue_purge(pktchain);
710 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
711 * @arrvq: queue with arriving messages, to be cloned after destination lookup
712 * @inputq: queue with cloned messages, delivered to socket after dest lookup
714 * Multi-threaded: parallel calls with reference to same queues may occur
716 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
717 struct sk_buff_head *inputq)
719 struct tipc_msg *msg;
720 struct tipc_plist dports;
722 u32 scope = TIPC_CLUSTER_SCOPE;
723 struct sk_buff_head tmpq;
725 struct sk_buff *skb, *_skb;
727 __skb_queue_head_init(&tmpq);
728 tipc_plist_init(&dports);
730 skb = tipc_skb_peek(arrvq, &inputq->lock);
731 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
733 hsz = skb_headroom(skb) + msg_hdr_sz(msg);
735 if (in_own_node(net, msg_orignode(msg)))
736 scope = TIPC_NODE_SCOPE;
738 /* Create destination port list and message clones: */
739 tipc_nametbl_mc_translate(net,
740 msg_nametype(msg), msg_namelower(msg),
741 msg_nameupper(msg), scope, &dports);
742 portid = tipc_plist_pop(&dports);
743 for (; portid; portid = tipc_plist_pop(&dports)) {
744 _skb = __pskb_copy(skb, hsz, GFP_ATOMIC);
746 msg_set_destport(buf_msg(_skb), portid);
747 __skb_queue_tail(&tmpq, _skb);
750 pr_warn("Failed to clone mcast rcv buffer\n");
752 /* Append to inputq if not already done by other thread */
753 spin_lock_bh(&inputq->lock);
754 if (skb_peek(arrvq) == skb) {
755 skb_queue_splice_tail_init(&tmpq, inputq);
756 kfree_skb(__skb_dequeue(arrvq));
758 spin_unlock_bh(&inputq->lock);
759 __skb_queue_purge(&tmpq);
762 tipc_sk_rcv(net, inputq);
766 * tipc_sk_proto_rcv - receive a connection mng protocol message
767 * @tsk: receiving socket
768 * @skb: pointer to message buffer. Set to NULL if buffer is consumed.
770 static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff **skb)
772 struct tipc_msg *msg = buf_msg(*skb);
775 u32 own_node = tsk_own_node(tsk);
776 /* Ignore if connection cannot be validated: */
777 if (!tsk_peer_msg(tsk, msg))
780 tsk->probing_state = TIPC_CONN_OK;
782 if (msg_type(msg) == CONN_ACK) {
783 conn_cong = tsk_conn_cong(tsk);
784 tsk->sent_unacked -= msg_msgcnt(msg);
786 tsk->sk.sk_write_space(&tsk->sk);
787 } else if (msg_type(msg) == CONN_PROBE) {
788 if (tipc_msg_reverse(own_node, *skb, &dnode, TIPC_OK)) {
789 msg_set_type(msg, CONN_PROBE_REPLY);
793 /* Do nothing if msg_type() == CONN_PROBE_REPLY */
799 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
801 struct sock *sk = sock->sk;
802 struct tipc_sock *tsk = tipc_sk(sk);
807 int err = sock_error(sk);
810 if (sock->state == SS_DISCONNECTING)
814 if (signal_pending(current))
815 return sock_intr_errno(*timeo_p);
817 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
818 done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
819 finish_wait(sk_sleep(sk), &wait);
825 * tipc_sendmsg - send message in connectionless manner
826 * @sock: socket structure
827 * @m: message to send
828 * @dsz: amount of user data to be sent
830 * Message must have an destination specified explicitly.
831 * Used for SOCK_RDM and SOCK_DGRAM messages,
832 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
833 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
835 * Returns the number of bytes sent on success, or errno otherwise
837 static int tipc_sendmsg(struct socket *sock,
838 struct msghdr *m, size_t dsz)
840 struct sock *sk = sock->sk;
844 ret = __tipc_sendmsg(sock, m, dsz);
850 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz)
852 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
853 struct sock *sk = sock->sk;
854 struct tipc_sock *tsk = tipc_sk(sk);
855 struct net *net = sock_net(sk);
856 struct tipc_msg *mhdr = &tsk->phdr;
858 struct sk_buff_head *pktchain = &sk->sk_write_queue;
860 struct tipc_name_seq *seq;
861 struct iov_iter save;
866 if (dsz > TIPC_MAX_USER_MSG_SIZE)
868 if (unlikely(!dest)) {
869 if (tsk->connected && sock->state == SS_READY)
872 return -EDESTADDRREQ;
873 } else if (unlikely(m->msg_namelen < sizeof(*dest)) ||
874 dest->family != AF_TIPC) {
877 if (unlikely(sock->state != SS_READY)) {
878 if (sock->state == SS_LISTENING)
880 if (sock->state != SS_UNCONNECTED)
884 if (dest->addrtype == TIPC_ADDR_NAME) {
885 tsk->conn_type = dest->addr.name.name.type;
886 tsk->conn_instance = dest->addr.name.name.instance;
889 seq = &dest->addr.nameseq;
890 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
892 if (dest->addrtype == TIPC_ADDR_MCAST) {
893 return tipc_sendmcast(sock, seq, m, dsz, timeo);
894 } else if (dest->addrtype == TIPC_ADDR_NAME) {
895 u32 type = dest->addr.name.name.type;
896 u32 inst = dest->addr.name.name.instance;
897 u32 domain = dest->addr.name.domain;
900 msg_set_type(mhdr, TIPC_NAMED_MSG);
901 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
902 msg_set_nametype(mhdr, type);
903 msg_set_nameinst(mhdr, inst);
904 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
905 dport = tipc_nametbl_translate(net, type, inst, &dnode);
906 msg_set_destnode(mhdr, dnode);
907 msg_set_destport(mhdr, dport);
908 if (unlikely(!dport && !dnode))
909 return -EHOSTUNREACH;
910 } else if (dest->addrtype == TIPC_ADDR_ID) {
911 dnode = dest->addr.id.node;
912 msg_set_type(mhdr, TIPC_DIRECT_MSG);
913 msg_set_lookup_scope(mhdr, 0);
914 msg_set_destnode(mhdr, dnode);
915 msg_set_destport(mhdr, dest->addr.id.ref);
916 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
921 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
922 rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, pktchain);
927 skb = skb_peek(pktchain);
928 TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong;
929 rc = tipc_link_xmit(net, pktchain, dnode, tsk->portid);
930 if (likely(rc >= 0)) {
931 if (sock->state != SS_READY)
932 sock->state = SS_CONNECTING;
936 if (rc == -EMSGSIZE) {
940 if (rc != -ELINKCONG)
943 rc = tipc_wait_for_sndmsg(sock, &timeo);
945 __skb_queue_purge(pktchain);
951 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
953 struct sock *sk = sock->sk;
954 struct tipc_sock *tsk = tipc_sk(sk);
959 int err = sock_error(sk);
962 if (sock->state == SS_DISCONNECTING)
964 else if (sock->state != SS_CONNECTED)
968 if (signal_pending(current))
969 return sock_intr_errno(*timeo_p);
971 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
972 done = sk_wait_event(sk, timeo_p,
974 !tsk_conn_cong(tsk)) ||
976 finish_wait(sk_sleep(sk), &wait);
982 * tipc_send_stream - send stream-oriented data
983 * @sock: socket structure
985 * @dsz: total length of data to be transmitted
987 * Used for SOCK_STREAM data.
989 * Returns the number of bytes sent on success (or partial success),
990 * or errno if no data sent
992 static int tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
994 struct sock *sk = sock->sk;
998 ret = __tipc_send_stream(sock, m, dsz);
1004 static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
1006 struct sock *sk = sock->sk;
1007 struct net *net = sock_net(sk);
1008 struct tipc_sock *tsk = tipc_sk(sk);
1009 struct tipc_msg *mhdr = &tsk->phdr;
1010 struct sk_buff_head *pktchain = &sk->sk_write_queue;
1011 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1012 u32 portid = tsk->portid;
1016 uint mtu, send, sent = 0;
1017 struct iov_iter save;
1019 /* Handle implied connection establishment */
1020 if (unlikely(dest)) {
1021 rc = __tipc_sendmsg(sock, m, dsz);
1022 if (dsz && (dsz == rc))
1023 tsk->sent_unacked = 1;
1026 if (dsz > (uint)INT_MAX)
1029 if (unlikely(sock->state != SS_CONNECTED)) {
1030 if (sock->state == SS_DISCONNECTING)
1036 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1037 dnode = tsk_peer_node(tsk);
1042 send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
1043 rc = tipc_msg_build(mhdr, m, sent, send, mtu, pktchain);
1044 if (unlikely(rc < 0))
1047 if (likely(!tsk_conn_cong(tsk))) {
1048 rc = tipc_link_xmit(net, pktchain, dnode, portid);
1050 tsk->sent_unacked++;
1056 if (rc == -EMSGSIZE) {
1057 tsk->max_pkt = tipc_node_get_mtu(net, dnode,
1062 if (rc != -ELINKCONG)
1066 rc = tipc_wait_for_sndpkt(sock, &timeo);
1068 __skb_queue_purge(pktchain);
1071 return sent ? sent : rc;
1075 * tipc_send_packet - send a connection-oriented message
1076 * @sock: socket structure
1077 * @m: message to send
1078 * @dsz: length of data to be transmitted
1080 * Used for SOCK_SEQPACKET messages.
1082 * Returns the number of bytes sent on success, or errno otherwise
1084 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1086 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1089 return tipc_send_stream(sock, m, dsz);
1092 /* tipc_sk_finish_conn - complete the setup of a connection
1094 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1097 struct sock *sk = &tsk->sk;
1098 struct net *net = sock_net(sk);
1099 struct tipc_msg *msg = &tsk->phdr;
1101 msg_set_destnode(msg, peer_node);
1102 msg_set_destport(msg, peer_port);
1103 msg_set_type(msg, TIPC_CONN_MSG);
1104 msg_set_lookup_scope(msg, 0);
1105 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1107 tsk->probing_intv = CONN_PROBING_INTERVAL;
1108 tsk->probing_state = TIPC_CONN_OK;
1110 sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv);
1111 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1112 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
1116 * set_orig_addr - capture sender's address for received message
1117 * @m: descriptor for message info
1118 * @msg: received message header
1120 * Note: Address is not captured if not requested by receiver.
1122 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
1124 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
1127 addr->family = AF_TIPC;
1128 addr->addrtype = TIPC_ADDR_ID;
1129 memset(&addr->addr, 0, sizeof(addr->addr));
1130 addr->addr.id.ref = msg_origport(msg);
1131 addr->addr.id.node = msg_orignode(msg);
1132 addr->addr.name.domain = 0; /* could leave uninitialized */
1133 addr->scope = 0; /* could leave uninitialized */
1134 m->msg_namelen = sizeof(struct sockaddr_tipc);
1139 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1140 * @m: descriptor for message info
1141 * @msg: received message header
1142 * @tsk: TIPC port associated with message
1144 * Note: Ancillary data is not captured if not requested by receiver.
1146 * Returns 0 if successful, otherwise errno
1148 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1149 struct tipc_sock *tsk)
1157 if (likely(m->msg_controllen == 0))
1160 /* Optionally capture errored message object(s) */
1161 err = msg ? msg_errcode(msg) : 0;
1162 if (unlikely(err)) {
1164 anc_data[1] = msg_data_sz(msg);
1165 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1169 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1176 /* Optionally capture message destination object */
1177 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1178 switch (dest_type) {
1179 case TIPC_NAMED_MSG:
1181 anc_data[0] = msg_nametype(msg);
1182 anc_data[1] = msg_namelower(msg);
1183 anc_data[2] = msg_namelower(msg);
1185 case TIPC_MCAST_MSG:
1187 anc_data[0] = msg_nametype(msg);
1188 anc_data[1] = msg_namelower(msg);
1189 anc_data[2] = msg_nameupper(msg);
1192 has_name = (tsk->conn_type != 0);
1193 anc_data[0] = tsk->conn_type;
1194 anc_data[1] = tsk->conn_instance;
1195 anc_data[2] = tsk->conn_instance;
1201 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1209 static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
1211 struct net *net = sock_net(&tsk->sk);
1212 struct sk_buff *skb = NULL;
1213 struct tipc_msg *msg;
1214 u32 peer_port = tsk_peer_port(tsk);
1215 u32 dnode = tsk_peer_node(tsk);
1217 if (!tsk->connected)
1219 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1220 dnode, tsk_own_node(tsk), peer_port,
1221 tsk->portid, TIPC_OK);
1225 msg_set_msgcnt(msg, ack);
1226 tipc_link_xmit_skb(net, skb, dnode, msg_link_selector(msg));
1229 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1231 struct sock *sk = sock->sk;
1233 long timeo = *timeop;
1237 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1238 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1239 if (sock->state == SS_DISCONNECTING) {
1244 timeo = schedule_timeout(timeo);
1248 if (!skb_queue_empty(&sk->sk_receive_queue))
1253 err = sock_intr_errno(timeo);
1254 if (signal_pending(current))
1257 finish_wait(sk_sleep(sk), &wait);
1263 * tipc_recvmsg - receive packet-oriented message
1264 * @m: descriptor for message info
1265 * @buf_len: total size of user buffer area
1266 * @flags: receive flags
1268 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1269 * If the complete message doesn't fit in user area, truncate it.
1271 * Returns size of returned message data, errno otherwise
1273 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, size_t buf_len,
1276 struct sock *sk = sock->sk;
1277 struct tipc_sock *tsk = tipc_sk(sk);
1278 struct sk_buff *buf;
1279 struct tipc_msg *msg;
1285 /* Catch invalid receive requests */
1286 if (unlikely(!buf_len))
1291 if (unlikely(sock->state == SS_UNCONNECTED)) {
1296 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1299 /* Look for a message in receive queue; wait if necessary */
1300 res = tipc_wait_for_rcvmsg(sock, &timeo);
1304 /* Look at first message in receive queue */
1305 buf = skb_peek(&sk->sk_receive_queue);
1307 sz = msg_data_sz(msg);
1308 err = msg_errcode(msg);
1310 /* Discard an empty non-errored message & try again */
1311 if ((!sz) && (!err)) {
1312 tsk_advance_rx_queue(sk);
1316 /* Capture sender's address (optional) */
1317 set_orig_addr(m, msg);
1319 /* Capture ancillary data (optional) */
1320 res = tipc_sk_anc_data_recv(m, msg, tsk);
1324 /* Capture message data (if valid) & compute return value (always) */
1326 if (unlikely(buf_len < sz)) {
1328 m->msg_flags |= MSG_TRUNC;
1330 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz);
1335 if ((sock->state == SS_READY) ||
1336 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1342 /* Consume received message (optional) */
1343 if (likely(!(flags & MSG_PEEK))) {
1344 if ((sock->state != SS_READY) &&
1345 (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1346 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1347 tsk->rcv_unacked = 0;
1349 tsk_advance_rx_queue(sk);
1357 * tipc_recv_stream - receive stream-oriented data
1358 * @m: descriptor for message info
1359 * @buf_len: total size of user buffer area
1360 * @flags: receive flags
1362 * Used for SOCK_STREAM messages only. If not enough data is available
1363 * will optionally wait for more; never truncates data.
1365 * Returns size of returned message data, errno otherwise
1367 static int tipc_recv_stream(struct socket *sock, struct msghdr *m,
1368 size_t buf_len, int flags)
1370 struct sock *sk = sock->sk;
1371 struct tipc_sock *tsk = tipc_sk(sk);
1372 struct sk_buff *buf;
1373 struct tipc_msg *msg;
1376 int sz_to_copy, target, needed;
1381 /* Catch invalid receive attempts */
1382 if (unlikely(!buf_len))
1387 if (unlikely(sock->state == SS_UNCONNECTED)) {
1392 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1393 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1396 /* Look for a message in receive queue; wait if necessary */
1397 res = tipc_wait_for_rcvmsg(sock, &timeo);
1401 /* Look at first message in receive queue */
1402 buf = skb_peek(&sk->sk_receive_queue);
1404 sz = msg_data_sz(msg);
1405 err = msg_errcode(msg);
1407 /* Discard an empty non-errored message & try again */
1408 if ((!sz) && (!err)) {
1409 tsk_advance_rx_queue(sk);
1413 /* Optionally capture sender's address & ancillary data of first msg */
1414 if (sz_copied == 0) {
1415 set_orig_addr(m, msg);
1416 res = tipc_sk_anc_data_recv(m, msg, tsk);
1421 /* Capture message data (if valid) & compute return value (always) */
1423 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1426 needed = (buf_len - sz_copied);
1427 sz_to_copy = (sz <= needed) ? sz : needed;
1429 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset,
1434 sz_copied += sz_to_copy;
1436 if (sz_to_copy < sz) {
1437 if (!(flags & MSG_PEEK))
1438 TIPC_SKB_CB(buf)->handle =
1439 (void *)(unsigned long)(offset + sz_to_copy);
1444 goto exit; /* can't add error msg to valid data */
1446 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1452 /* Consume received message (optional) */
1453 if (likely(!(flags & MSG_PEEK))) {
1454 if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1455 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1456 tsk->rcv_unacked = 0;
1458 tsk_advance_rx_queue(sk);
1461 /* Loop around if more data is required */
1462 if ((sz_copied < buf_len) && /* didn't get all requested data */
1463 (!skb_queue_empty(&sk->sk_receive_queue) ||
1464 (sz_copied < target)) && /* and more is ready or required */
1465 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1466 (!err)) /* and haven't reached a FIN */
1471 return sz_copied ? sz_copied : res;
1475 * tipc_write_space - wake up thread if port congestion is released
1478 static void tipc_write_space(struct sock *sk)
1480 struct socket_wq *wq;
1483 wq = rcu_dereference(sk->sk_wq);
1484 if (wq_has_sleeper(wq))
1485 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1486 POLLWRNORM | POLLWRBAND);
1491 * tipc_data_ready - wake up threads to indicate messages have been received
1493 * @len: the length of messages
1495 static void tipc_data_ready(struct sock *sk)
1497 struct socket_wq *wq;
1500 wq = rcu_dereference(sk->sk_wq);
1501 if (wq_has_sleeper(wq))
1502 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1503 POLLRDNORM | POLLRDBAND);
1508 * filter_connect - Handle all incoming messages for a connection-based socket
1510 * @skb: pointer to message buffer. Set to NULL if buffer is consumed
1512 * Returns 0 (TIPC_OK) if everything ok, -TIPC_ERR_NO_PORT otherwise
1514 static int filter_connect(struct tipc_sock *tsk, struct sk_buff **skb)
1516 struct sock *sk = &tsk->sk;
1517 struct net *net = sock_net(sk);
1518 struct socket *sock = sk->sk_socket;
1519 struct tipc_msg *msg = buf_msg(*skb);
1520 int retval = -TIPC_ERR_NO_PORT;
1525 switch ((int)sock->state) {
1527 /* Accept only connection-based messages sent by peer */
1528 if (tsk_peer_msg(tsk, msg)) {
1529 if (unlikely(msg_errcode(msg))) {
1530 sock->state = SS_DISCONNECTING;
1532 /* let timer expire on it's own */
1533 tipc_node_remove_conn(net, tsk_peer_node(tsk),
1540 /* Accept only ACK or NACK message */
1542 if (unlikely(!msg_connected(msg)))
1545 if (unlikely(msg_errcode(msg))) {
1546 sock->state = SS_DISCONNECTING;
1547 sk->sk_err = ECONNREFUSED;
1552 if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
1553 sock->state = SS_DISCONNECTING;
1554 sk->sk_err = EINVAL;
1559 tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg));
1560 msg_set_importance(&tsk->phdr, msg_importance(msg));
1561 sock->state = SS_CONNECTED;
1563 /* If an incoming message is an 'ACK-', it should be
1564 * discarded here because it doesn't contain useful
1565 * data. In addition, we should try to wake up
1566 * connect() routine if sleeping.
1568 if (msg_data_sz(msg) == 0) {
1571 if (waitqueue_active(sk_sleep(sk)))
1572 wake_up_interruptible(sk_sleep(sk));
1577 case SS_UNCONNECTED:
1578 /* Accept only SYN message */
1579 if (!msg_connected(msg) && !(msg_errcode(msg)))
1582 case SS_DISCONNECTING:
1585 pr_err("Unknown socket state %u\n", sock->state);
1591 * rcvbuf_limit - get proper overload limit of socket receive queue
1595 * For all connection oriented messages, irrespective of importance,
1596 * the default overload value (i.e. 67MB) is set as limit.
1598 * For all connectionless messages, by default new queue limits are
1601 * TIPC_LOW_IMPORTANCE (4 MB)
1602 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1603 * TIPC_HIGH_IMPORTANCE (16 MB)
1604 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1606 * Returns overload limit according to corresponding message importance
1608 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1610 struct tipc_msg *msg = buf_msg(buf);
1612 if (msg_connected(msg))
1613 return sysctl_tipc_rmem[2];
1615 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1616 msg_importance(msg);
1620 * filter_rcv - validate incoming message
1622 * @skb: pointer to message. Set to NULL if buffer is consumed.
1624 * Enqueues message on receive queue if acceptable; optionally handles
1625 * disconnect indication for a connected socket.
1627 * Called with socket lock already taken
1629 * Returns 0 (TIPC_OK) if message was ok, -TIPC error code if rejected
1631 static int filter_rcv(struct sock *sk, struct sk_buff **skb)
1633 struct socket *sock = sk->sk_socket;
1634 struct tipc_sock *tsk = tipc_sk(sk);
1635 struct tipc_msg *msg = buf_msg(*skb);
1636 unsigned int limit = rcvbuf_limit(sk, *skb);
1639 if (unlikely(msg_user(msg) == CONN_MANAGER)) {
1640 tipc_sk_proto_rcv(tsk, skb);
1644 if (unlikely(msg_user(msg) == SOCK_WAKEUP)) {
1647 sk->sk_write_space(sk);
1652 /* Reject message if it is wrong sort of message for socket */
1653 if (msg_type(msg) > TIPC_DIRECT_MSG)
1654 return -TIPC_ERR_NO_PORT;
1656 if (sock->state == SS_READY) {
1657 if (msg_connected(msg))
1658 return -TIPC_ERR_NO_PORT;
1660 rc = filter_connect(tsk, skb);
1661 if (rc != TIPC_OK || !*skb)
1665 /* Reject message if there isn't room to queue it */
1666 if (sk_rmem_alloc_get(sk) + (*skb)->truesize >= limit)
1667 return -TIPC_ERR_OVERLOAD;
1669 /* Enqueue message */
1670 TIPC_SKB_CB(*skb)->handle = NULL;
1671 __skb_queue_tail(&sk->sk_receive_queue, *skb);
1672 skb_set_owner_r(*skb, sk);
1674 sk->sk_data_ready(sk);
1680 * tipc_backlog_rcv - handle incoming message from backlog queue
1684 * Caller must hold socket lock
1688 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
1693 struct tipc_sock *tsk = tipc_sk(sk);
1694 struct net *net = sock_net(sk);
1695 uint truesize = skb->truesize;
1697 err = filter_rcv(sk, &skb);
1699 dcnt = &tsk->dupl_rcvcnt;
1700 if (atomic_read(dcnt) < TIPC_CONN_OVERLOAD_LIMIT)
1701 atomic_add(truesize, dcnt);
1704 if (!err || tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode, -err))
1705 tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
1710 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
1711 * inputq and try adding them to socket or backlog queue
1712 * @inputq: list of incoming buffers with potentially different destinations
1713 * @sk: socket where the buffers should be enqueued
1714 * @dport: port number for the socket
1715 * @_skb: returned buffer to be forwarded or rejected, if applicable
1717 * Caller must hold socket lock
1719 * Returns TIPC_OK if all buffers enqueued, otherwise -TIPC_ERR_OVERLOAD
1720 * or -TIPC_ERR_NO_PORT
1722 static int tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
1723 u32 dport, struct sk_buff **_skb)
1728 struct sk_buff *skb;
1729 unsigned long time_limit = jiffies + 2;
1731 while (skb_queue_len(inputq)) {
1732 if (unlikely(time_after_eq(jiffies, time_limit)))
1734 skb = tipc_skb_dequeue(inputq, dport);
1737 if (!sock_owned_by_user(sk)) {
1738 err = filter_rcv(sk, &skb);
1744 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
1745 if (sk->sk_backlog.len)
1746 atomic_set(dcnt, 0);
1747 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
1748 if (likely(!sk_add_backlog(sk, skb, lim)))
1751 return -TIPC_ERR_OVERLOAD;
1757 * tipc_sk_rcv - handle a chain of incoming buffers
1758 * @inputq: buffer list containing the buffers
1759 * Consumes all buffers in list until inputq is empty
1760 * Note: may be called in multiple threads referring to the same queue
1761 * Returns 0 if last buffer was accepted, otherwise -EHOSTUNREACH
1762 * Only node local calls check the return value, sending single-buffer queues
1764 int tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
1766 u32 dnode, dport = 0;
1768 struct sk_buff *skb;
1769 struct tipc_sock *tsk;
1770 struct tipc_net *tn;
1773 while (skb_queue_len(inputq)) {
1774 err = -TIPC_ERR_NO_PORT;
1776 dport = tipc_skb_peek_port(inputq, dport);
1777 tsk = tipc_sk_lookup(net, dport);
1780 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
1781 err = tipc_sk_enqueue(inputq, sk, dport, &skb);
1782 spin_unlock_bh(&sk->sk_lock.slock);
1787 skb = tipc_skb_dequeue(inputq, dport);
1791 if (tipc_msg_lookup_dest(net, skb, &dnode, &err))
1794 dnode = msg_destnode(buf_msg(skb));
1797 tn = net_generic(net, tipc_net_id);
1798 if (!tipc_msg_reverse(tn->own_addr, skb, &dnode, -err))
1801 tipc_link_xmit_skb(net, skb, dnode, dport);
1803 return err ? -EHOSTUNREACH : 0;
1806 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1808 struct sock *sk = sock->sk;
1813 int err = sock_error(sk);
1818 if (signal_pending(current))
1819 return sock_intr_errno(*timeo_p);
1821 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1822 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1823 finish_wait(sk_sleep(sk), &wait);
1829 * tipc_connect - establish a connection to another TIPC port
1830 * @sock: socket structure
1831 * @dest: socket address for destination port
1832 * @destlen: size of socket address data structure
1833 * @flags: file-related flags associated with socket
1835 * Returns 0 on success, errno otherwise
1837 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1838 int destlen, int flags)
1840 struct sock *sk = sock->sk;
1841 struct tipc_sock *tsk = tipc_sk(sk);
1842 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1843 struct msghdr m = {NULL,};
1844 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
1845 socket_state previous;
1850 /* DGRAM/RDM connect(), just save the destaddr */
1851 if (sock->state == SS_READY) {
1852 if (dst->family == AF_UNSPEC) {
1853 memset(&tsk->remote, 0, sizeof(struct sockaddr_tipc));
1855 } else if (destlen != sizeof(struct sockaddr_tipc)) {
1858 memcpy(&tsk->remote, dest, destlen);
1865 * Reject connection attempt using multicast address
1867 * Note: send_msg() validates the rest of the address fields,
1868 * so there's no need to do it here
1870 if (dst->addrtype == TIPC_ADDR_MCAST) {
1875 previous = sock->state;
1876 switch (sock->state) {
1877 case SS_UNCONNECTED:
1878 /* Send a 'SYN-' to destination */
1880 m.msg_namelen = destlen;
1882 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1883 * indicate send_msg() is never blocked.
1886 m.msg_flags = MSG_DONTWAIT;
1888 res = __tipc_sendmsg(sock, &m, 0);
1889 if ((res < 0) && (res != -EWOULDBLOCK))
1892 /* Just entered SS_CONNECTING state; the only
1893 * difference is that return value in non-blocking
1894 * case is EINPROGRESS, rather than EALREADY.
1898 if (previous == SS_CONNECTING)
1902 timeout = msecs_to_jiffies(timeout);
1903 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1904 res = tipc_wait_for_connect(sock, &timeout);
1919 * tipc_listen - allow socket to listen for incoming connections
1920 * @sock: socket structure
1923 * Returns 0 on success, errno otherwise
1925 static int tipc_listen(struct socket *sock, int len)
1927 struct sock *sk = sock->sk;
1932 if (sock->state != SS_UNCONNECTED)
1935 sock->state = SS_LISTENING;
1943 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1945 struct sock *sk = sock->sk;
1949 /* True wake-one mechanism for incoming connections: only
1950 * one process gets woken up, not the 'whole herd'.
1951 * Since we do not 'race & poll' for established sockets
1952 * anymore, the common case will execute the loop only once.
1955 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1956 TASK_INTERRUPTIBLE);
1957 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1959 timeo = schedule_timeout(timeo);
1963 if (!skb_queue_empty(&sk->sk_receive_queue))
1966 if (sock->state != SS_LISTENING)
1971 err = sock_intr_errno(timeo);
1972 if (signal_pending(current))
1975 finish_wait(sk_sleep(sk), &wait);
1980 * tipc_accept - wait for connection request
1981 * @sock: listening socket
1982 * @newsock: new socket that is to be connected
1983 * @flags: file-related flags associated with socket
1985 * Returns 0 on success, errno otherwise
1987 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1989 struct sock *new_sk, *sk = sock->sk;
1990 struct sk_buff *buf;
1991 struct tipc_sock *new_tsock;
1992 struct tipc_msg *msg;
1998 if (sock->state != SS_LISTENING) {
2002 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2003 res = tipc_wait_for_accept(sock, timeo);
2007 buf = skb_peek(&sk->sk_receive_queue);
2009 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
2013 new_sk = new_sock->sk;
2014 new_tsock = tipc_sk(new_sk);
2017 /* we lock on new_sk; but lockdep sees the lock on sk */
2018 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2021 * Reject any stray messages received by new socket
2022 * before the socket lock was taken (very, very unlikely)
2024 tsk_rej_rx_queue(new_sk);
2026 /* Connect new socket to it's peer */
2027 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2028 new_sock->state = SS_CONNECTED;
2030 tsk_set_importance(new_tsock, msg_importance(msg));
2031 if (msg_named(msg)) {
2032 new_tsock->conn_type = msg_nametype(msg);
2033 new_tsock->conn_instance = msg_nameinst(msg);
2037 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2038 * Respond to 'SYN+' by queuing it on new socket.
2040 if (!msg_data_sz(msg)) {
2041 struct msghdr m = {NULL,};
2043 tsk_advance_rx_queue(sk);
2044 __tipc_send_stream(new_sock, &m, 0);
2046 __skb_dequeue(&sk->sk_receive_queue);
2047 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2048 skb_set_owner_r(buf, new_sk);
2050 release_sock(new_sk);
2057 * tipc_shutdown - shutdown socket connection
2058 * @sock: socket structure
2059 * @how: direction to close (must be SHUT_RDWR)
2061 * Terminates connection (if necessary), then purges socket's receive queue.
2063 * Returns 0 on success, errno otherwise
2065 static int tipc_shutdown(struct socket *sock, int how)
2067 struct sock *sk = sock->sk;
2068 struct net *net = sock_net(sk);
2069 struct tipc_sock *tsk = tipc_sk(sk);
2070 struct sk_buff *skb;
2074 if (how != SHUT_RDWR)
2079 switch (sock->state) {
2084 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
2085 skb = __skb_dequeue(&sk->sk_receive_queue);
2087 if (TIPC_SKB_CB(skb)->handle != NULL) {
2091 if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode,
2092 TIPC_CONN_SHUTDOWN))
2093 tipc_link_xmit_skb(net, skb, dnode,
2096 dnode = tsk_peer_node(tsk);
2098 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2099 TIPC_CONN_MSG, SHORT_H_SIZE,
2100 0, dnode, tsk_own_node(tsk),
2102 tsk->portid, TIPC_CONN_SHUTDOWN);
2103 tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
2106 sock->state = SS_DISCONNECTING;
2107 tipc_node_remove_conn(net, dnode, tsk->portid);
2110 case SS_DISCONNECTING:
2112 /* Discard any unreceived messages */
2113 __skb_queue_purge(&sk->sk_receive_queue);
2115 /* Wake up anyone sleeping in poll */
2116 sk->sk_state_change(sk);
2128 static void tipc_sk_timeout(unsigned long data)
2130 struct tipc_sock *tsk = (struct tipc_sock *)data;
2131 struct sock *sk = &tsk->sk;
2132 struct sk_buff *skb = NULL;
2133 u32 peer_port, peer_node;
2134 u32 own_node = tsk_own_node(tsk);
2137 if (!tsk->connected) {
2141 peer_port = tsk_peer_port(tsk);
2142 peer_node = tsk_peer_node(tsk);
2144 if (tsk->probing_state == TIPC_CONN_PROBING) {
2145 /* Previous probe not answered -> self abort */
2146 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2147 TIPC_CONN_MSG, SHORT_H_SIZE, 0,
2148 own_node, peer_node, tsk->portid,
2149 peer_port, TIPC_ERR_NO_PORT);
2151 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE,
2152 INT_H_SIZE, 0, peer_node, own_node,
2153 peer_port, tsk->portid, TIPC_OK);
2154 tsk->probing_state = TIPC_CONN_PROBING;
2155 sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv);
2159 tipc_link_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid);
2164 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2165 struct tipc_name_seq const *seq)
2167 struct net *net = sock_net(&tsk->sk);
2168 struct publication *publ;
2173 key = tsk->portid + tsk->pub_count + 1;
2174 if (key == tsk->portid)
2177 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2178 scope, tsk->portid, key);
2179 if (unlikely(!publ))
2182 list_add(&publ->pport_list, &tsk->publications);
2188 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2189 struct tipc_name_seq const *seq)
2191 struct net *net = sock_net(&tsk->sk);
2192 struct publication *publ;
2193 struct publication *safe;
2196 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2198 if (publ->scope != scope)
2200 if (publ->type != seq->type)
2202 if (publ->lower != seq->lower)
2204 if (publ->upper != seq->upper)
2206 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2207 publ->ref, publ->key);
2211 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2212 publ->ref, publ->key);
2215 if (list_empty(&tsk->publications))
2220 /* tipc_sk_reinit: set non-zero address in all existing sockets
2221 * when we go from standalone to network mode.
2223 void tipc_sk_reinit(struct net *net)
2225 struct tipc_net *tn = net_generic(net, tipc_net_id);
2226 const struct bucket_table *tbl;
2227 struct rhash_head *pos;
2228 struct tipc_sock *tsk;
2229 struct tipc_msg *msg;
2233 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
2234 for (i = 0; i < tbl->size; i++) {
2235 rht_for_each_entry_rcu(tsk, pos, tbl, i, node) {
2236 spin_lock_bh(&tsk->sk.sk_lock.slock);
2238 msg_set_prevnode(msg, tn->own_addr);
2239 msg_set_orignode(msg, tn->own_addr);
2240 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2246 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2248 struct tipc_net *tn = net_generic(net, tipc_net_id);
2249 struct tipc_sock *tsk;
2252 tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
2254 sock_hold(&tsk->sk);
2260 static int tipc_sk_insert(struct tipc_sock *tsk)
2262 struct sock *sk = &tsk->sk;
2263 struct net *net = sock_net(sk);
2264 struct tipc_net *tn = net_generic(net, tipc_net_id);
2265 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2266 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2268 while (remaining--) {
2270 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2271 portid = TIPC_MIN_PORT;
2272 tsk->portid = portid;
2273 sock_hold(&tsk->sk);
2274 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2283 static void tipc_sk_remove(struct tipc_sock *tsk)
2285 struct sock *sk = &tsk->sk;
2286 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
2288 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
2289 WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
2294 static const struct rhashtable_params tsk_rht_params = {
2296 .head_offset = offsetof(struct tipc_sock, node),
2297 .key_offset = offsetof(struct tipc_sock, portid),
2298 .key_len = sizeof(u32), /* portid */
2299 .max_size = 1048576,
2301 .automatic_shrinking = true,
2304 int tipc_sk_rht_init(struct net *net)
2306 struct tipc_net *tn = net_generic(net, tipc_net_id);
2308 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
2311 void tipc_sk_rht_destroy(struct net *net)
2313 struct tipc_net *tn = net_generic(net, tipc_net_id);
2315 /* Wait for socket readers to complete */
2318 rhashtable_destroy(&tn->sk_rht);
2322 * tipc_setsockopt - set socket option
2323 * @sock: socket structure
2324 * @lvl: option level
2325 * @opt: option identifier
2326 * @ov: pointer to new option value
2327 * @ol: length of option value
2329 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2330 * (to ease compatibility).
2332 * Returns 0 on success, errno otherwise
2334 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2335 char __user *ov, unsigned int ol)
2337 struct sock *sk = sock->sk;
2338 struct tipc_sock *tsk = tipc_sk(sk);
2342 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2344 if (lvl != SOL_TIPC)
2345 return -ENOPROTOOPT;
2346 if (ol < sizeof(value))
2348 res = get_user(value, (u32 __user *)ov);
2355 case TIPC_IMPORTANCE:
2356 res = tsk_set_importance(tsk, value);
2358 case TIPC_SRC_DROPPABLE:
2359 if (sock->type != SOCK_STREAM)
2360 tsk_set_unreliable(tsk, value);
2364 case TIPC_DEST_DROPPABLE:
2365 tsk_set_unreturnable(tsk, value);
2367 case TIPC_CONN_TIMEOUT:
2368 tipc_sk(sk)->conn_timeout = value;
2369 /* no need to set "res", since already 0 at this point */
2381 * tipc_getsockopt - get socket option
2382 * @sock: socket structure
2383 * @lvl: option level
2384 * @opt: option identifier
2385 * @ov: receptacle for option value
2386 * @ol: receptacle for length of option value
2388 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2389 * (to ease compatibility).
2391 * Returns 0 on success, errno otherwise
2393 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2394 char __user *ov, int __user *ol)
2396 struct sock *sk = sock->sk;
2397 struct tipc_sock *tsk = tipc_sk(sk);
2402 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2403 return put_user(0, ol);
2404 if (lvl != SOL_TIPC)
2405 return -ENOPROTOOPT;
2406 res = get_user(len, ol);
2413 case TIPC_IMPORTANCE:
2414 value = tsk_importance(tsk);
2416 case TIPC_SRC_DROPPABLE:
2417 value = tsk_unreliable(tsk);
2419 case TIPC_DEST_DROPPABLE:
2420 value = tsk_unreturnable(tsk);
2422 case TIPC_CONN_TIMEOUT:
2423 value = tsk->conn_timeout;
2424 /* no need to set "res", since already 0 at this point */
2426 case TIPC_NODE_RECVQ_DEPTH:
2427 value = 0; /* was tipc_queue_size, now obsolete */
2429 case TIPC_SOCK_RECVQ_DEPTH:
2430 value = skb_queue_len(&sk->sk_receive_queue);
2439 return res; /* "get" failed */
2441 if (len < sizeof(value))
2444 if (copy_to_user(ov, &value, sizeof(value)))
2447 return put_user(sizeof(value), ol);
2450 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2452 struct sock *sk = sock->sk;
2453 struct tipc_sioc_ln_req lnr;
2454 void __user *argp = (void __user *)arg;
2457 case SIOCGETLINKNAME:
2458 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2460 if (!tipc_node_get_linkname(sock_net(sk),
2461 lnr.bearer_id & 0xffff, lnr.peer,
2462 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2463 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2467 return -EADDRNOTAVAIL;
2469 return -ENOIOCTLCMD;
2473 /* Protocol switches for the various types of TIPC sockets */
2475 static const struct proto_ops msg_ops = {
2476 .owner = THIS_MODULE,
2478 .release = tipc_release,
2480 .connect = tipc_connect,
2481 .socketpair = sock_no_socketpair,
2482 .accept = sock_no_accept,
2483 .getname = tipc_getname,
2485 .ioctl = tipc_ioctl,
2486 .listen = sock_no_listen,
2487 .shutdown = tipc_shutdown,
2488 .setsockopt = tipc_setsockopt,
2489 .getsockopt = tipc_getsockopt,
2490 .sendmsg = tipc_sendmsg,
2491 .recvmsg = tipc_recvmsg,
2492 .mmap = sock_no_mmap,
2493 .sendpage = sock_no_sendpage
2496 static const struct proto_ops packet_ops = {
2497 .owner = THIS_MODULE,
2499 .release = tipc_release,
2501 .connect = tipc_connect,
2502 .socketpair = sock_no_socketpair,
2503 .accept = tipc_accept,
2504 .getname = tipc_getname,
2506 .ioctl = tipc_ioctl,
2507 .listen = tipc_listen,
2508 .shutdown = tipc_shutdown,
2509 .setsockopt = tipc_setsockopt,
2510 .getsockopt = tipc_getsockopt,
2511 .sendmsg = tipc_send_packet,
2512 .recvmsg = tipc_recvmsg,
2513 .mmap = sock_no_mmap,
2514 .sendpage = sock_no_sendpage
2517 static const struct proto_ops stream_ops = {
2518 .owner = THIS_MODULE,
2520 .release = tipc_release,
2522 .connect = tipc_connect,
2523 .socketpair = sock_no_socketpair,
2524 .accept = tipc_accept,
2525 .getname = tipc_getname,
2527 .ioctl = tipc_ioctl,
2528 .listen = tipc_listen,
2529 .shutdown = tipc_shutdown,
2530 .setsockopt = tipc_setsockopt,
2531 .getsockopt = tipc_getsockopt,
2532 .sendmsg = tipc_send_stream,
2533 .recvmsg = tipc_recv_stream,
2534 .mmap = sock_no_mmap,
2535 .sendpage = sock_no_sendpage
2538 static const struct net_proto_family tipc_family_ops = {
2539 .owner = THIS_MODULE,
2541 .create = tipc_sk_create
2544 static struct proto tipc_proto = {
2546 .owner = THIS_MODULE,
2547 .obj_size = sizeof(struct tipc_sock),
2548 .sysctl_rmem = sysctl_tipc_rmem
2552 * tipc_socket_init - initialize TIPC socket interface
2554 * Returns 0 on success, errno otherwise
2556 int tipc_socket_init(void)
2560 res = proto_register(&tipc_proto, 1);
2562 pr_err("Failed to register TIPC protocol type\n");
2566 res = sock_register(&tipc_family_ops);
2568 pr_err("Failed to register TIPC socket type\n");
2569 proto_unregister(&tipc_proto);
2577 * tipc_socket_stop - stop TIPC socket interface
2579 void tipc_socket_stop(void)
2581 sock_unregister(tipc_family_ops.family);
2582 proto_unregister(&tipc_proto);
2585 /* Caller should hold socket lock for the passed tipc socket. */
2586 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
2590 struct nlattr *nest;
2592 peer_node = tsk_peer_node(tsk);
2593 peer_port = tsk_peer_port(tsk);
2595 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
2597 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
2599 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
2602 if (tsk->conn_type != 0) {
2603 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
2605 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
2607 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
2610 nla_nest_end(skb, nest);
2615 nla_nest_cancel(skb, nest);
2620 /* Caller should hold socket lock for the passed tipc socket. */
2621 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
2622 struct tipc_sock *tsk)
2626 struct nlattr *attrs;
2627 struct net *net = sock_net(skb->sk);
2628 struct tipc_net *tn = net_generic(net, tipc_net_id);
2630 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2631 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
2635 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
2637 goto genlmsg_cancel;
2638 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid))
2639 goto attr_msg_cancel;
2640 if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr))
2641 goto attr_msg_cancel;
2643 if (tsk->connected) {
2644 err = __tipc_nl_add_sk_con(skb, tsk);
2646 goto attr_msg_cancel;
2647 } else if (!list_empty(&tsk->publications)) {
2648 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
2649 goto attr_msg_cancel;
2651 nla_nest_end(skb, attrs);
2652 genlmsg_end(skb, hdr);
2657 nla_nest_cancel(skb, attrs);
2659 genlmsg_cancel(skb, hdr);
2664 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
2667 struct tipc_sock *tsk;
2668 const struct bucket_table *tbl;
2669 struct rhash_head *pos;
2670 struct net *net = sock_net(skb->sk);
2671 struct tipc_net *tn = net_generic(net, tipc_net_id);
2672 u32 tbl_id = cb->args[0];
2673 u32 prev_portid = cb->args[1];
2676 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
2677 for (; tbl_id < tbl->size; tbl_id++) {
2678 rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) {
2679 spin_lock_bh(&tsk->sk.sk_lock.slock);
2680 if (prev_portid && prev_portid != tsk->portid) {
2681 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2685 err = __tipc_nl_add_sk(skb, cb, tsk);
2687 prev_portid = tsk->portid;
2688 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2692 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2697 cb->args[0] = tbl_id;
2698 cb->args[1] = prev_portid;
2703 /* Caller should hold socket lock for the passed tipc socket. */
2704 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
2705 struct netlink_callback *cb,
2706 struct publication *publ)
2709 struct nlattr *attrs;
2711 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2712 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
2716 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
2718 goto genlmsg_cancel;
2720 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
2721 goto attr_msg_cancel;
2722 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
2723 goto attr_msg_cancel;
2724 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
2725 goto attr_msg_cancel;
2726 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
2727 goto attr_msg_cancel;
2729 nla_nest_end(skb, attrs);
2730 genlmsg_end(skb, hdr);
2735 nla_nest_cancel(skb, attrs);
2737 genlmsg_cancel(skb, hdr);
2742 /* Caller should hold socket lock for the passed tipc socket. */
2743 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
2744 struct netlink_callback *cb,
2745 struct tipc_sock *tsk, u32 *last_publ)
2748 struct publication *p;
2751 list_for_each_entry(p, &tsk->publications, pport_list) {
2752 if (p->key == *last_publ)
2755 if (p->key != *last_publ) {
2756 /* We never set seq or call nl_dump_check_consistent()
2757 * this means that setting prev_seq here will cause the
2758 * consistence check to fail in the netlink callback
2759 * handler. Resulting in the last NLMSG_DONE message
2760 * having the NLM_F_DUMP_INTR flag set.
2767 p = list_first_entry(&tsk->publications, struct publication,
2771 list_for_each_entry_from(p, &tsk->publications, pport_list) {
2772 err = __tipc_nl_add_sk_publ(skb, cb, p);
2774 *last_publ = p->key;
2783 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
2786 u32 tsk_portid = cb->args[0];
2787 u32 last_publ = cb->args[1];
2788 u32 done = cb->args[2];
2789 struct net *net = sock_net(skb->sk);
2790 struct tipc_sock *tsk;
2793 struct nlattr **attrs;
2794 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
2796 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2800 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
2801 attrs[TIPC_NLA_SOCK],
2802 tipc_nl_sock_policy);
2806 if (!sock[TIPC_NLA_SOCK_REF])
2809 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
2815 tsk = tipc_sk_lookup(net, tsk_portid);
2819 lock_sock(&tsk->sk);
2820 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
2823 release_sock(&tsk->sk);
2826 cb->args[0] = tsk_portid;
2827 cb->args[1] = last_publ;