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>
38 #include <linux/jhash.h>
40 #include "name_table.h"
43 #include "name_distr.h"
46 #define SS_LISTENING -1 /* socket is listening */
47 #define SS_READY -2 /* socket is connectionless */
49 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
50 #define CONN_PROBING_INTERVAL msecs_to_jiffies(3600000) /* [ms] => 1 h */
51 #define TIPC_FWD_MSG 1
52 #define TIPC_CONN_OK 0
53 #define TIPC_CONN_PROBING 1
54 #define TIPC_MAX_PORT 0xffffffff
55 #define TIPC_MIN_PORT 1
58 * struct tipc_sock - TIPC socket structure
59 * @sk: socket - interacts with 'port' and with user via the socket API
60 * @connected: non-zero if port is currently connected to a peer port
61 * @conn_type: TIPC type used when connection was established
62 * @conn_instance: TIPC instance used when connection was established
63 * @published: non-zero if port has one or more associated names
64 * @max_pkt: maximum packet size "hint" used when building messages sent by port
65 * @portid: unique port identity in TIPC socket hash table
66 * @phdr: preformatted message header used when sending messages
67 * @port_list: adjacent ports in TIPC's global list of ports
68 * @publications: list of publications for port
69 * @pub_count: total # of publications port has made during its lifetime
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
77 * @remote: 'connected' peer for dgram/rdm
78 * @node: hash table node
79 * @rcu: rcu struct for tipc_sock
90 struct list_head sock_list;
91 struct list_head publications;
94 unsigned long probing_intv;
100 struct sockaddr_tipc remote;
101 struct rhash_head node;
105 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
106 static void tipc_data_ready(struct sock *sk);
107 static void tipc_write_space(struct sock *sk);
108 static int tipc_release(struct socket *sock);
109 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
110 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
111 static void tipc_sk_timeout(unsigned long data);
112 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
113 struct tipc_name_seq const *seq);
114 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
115 struct tipc_name_seq const *seq);
116 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
117 static int tipc_sk_insert(struct tipc_sock *tsk);
118 static void tipc_sk_remove(struct tipc_sock *tsk);
119 static int __tipc_send_stream(struct socket *sock, struct msghdr *m,
121 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
123 static const struct proto_ops packet_ops;
124 static const struct proto_ops stream_ops;
125 static const struct proto_ops msg_ops;
126 static struct proto tipc_proto;
128 static const struct nla_policy tipc_nl_sock_policy[TIPC_NLA_SOCK_MAX + 1] = {
129 [TIPC_NLA_SOCK_UNSPEC] = { .type = NLA_UNSPEC },
130 [TIPC_NLA_SOCK_ADDR] = { .type = NLA_U32 },
131 [TIPC_NLA_SOCK_REF] = { .type = NLA_U32 },
132 [TIPC_NLA_SOCK_CON] = { .type = NLA_NESTED },
133 [TIPC_NLA_SOCK_HAS_PUBL] = { .type = NLA_FLAG }
137 * Revised TIPC socket locking policy:
139 * Most socket operations take the standard socket lock when they start
140 * and hold it until they finish (or until they need to sleep). Acquiring
141 * this lock grants the owner exclusive access to the fields of the socket
142 * data structures, with the exception of the backlog queue. A few socket
143 * operations can be done without taking the socket lock because they only
144 * read socket information that never changes during the life of the socket.
146 * Socket operations may acquire the lock for the associated TIPC port if they
147 * need to perform an operation on the port. If any routine needs to acquire
148 * both the socket lock and the port lock it must take the socket lock first
149 * to avoid the risk of deadlock.
151 * The dispatcher handling incoming messages cannot grab the socket lock in
152 * the standard fashion, since invoked it runs at the BH level and cannot block.
153 * Instead, it checks to see if the socket lock is currently owned by someone,
154 * and either handles the message itself or adds it to the socket's backlog
155 * queue; in the latter case the queued message is processed once the process
156 * owning the socket lock releases it.
158 * NOTE: Releasing the socket lock while an operation is sleeping overcomes
159 * the problem of a blocked socket operation preventing any other operations
160 * from occurring. However, applications must be careful if they have
161 * multiple threads trying to send (or receive) on the same socket, as these
162 * operations might interfere with each other. For example, doing a connect
163 * and a receive at the same time might allow the receive to consume the
164 * ACK message meant for the connect. While additional work could be done
165 * to try and overcome this, it doesn't seem to be worthwhile at the present.
167 * NOTE: Releasing the socket lock while an operation is sleeping also ensures
168 * that another operation that must be performed in a non-blocking manner is
169 * not delayed for very long because the lock has already been taken.
171 * NOTE: This code assumes that certain fields of a port/socket pair are
172 * constant over its lifetime; such fields can be examined without taking
173 * the socket lock and/or port lock, and do not need to be re-read even
174 * after resuming processing after waiting. These fields include:
176 * - pointer to socket sk structure (aka tipc_sock structure)
177 * - pointer to port structure
181 static u32 tsk_own_node(struct tipc_sock *tsk)
183 return msg_prevnode(&tsk->phdr);
186 static u32 tsk_peer_node(struct tipc_sock *tsk)
188 return msg_destnode(&tsk->phdr);
191 static u32 tsk_peer_port(struct tipc_sock *tsk)
193 return msg_destport(&tsk->phdr);
196 static bool tsk_unreliable(struct tipc_sock *tsk)
198 return msg_src_droppable(&tsk->phdr) != 0;
201 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
203 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
206 static bool tsk_unreturnable(struct tipc_sock *tsk)
208 return msg_dest_droppable(&tsk->phdr) != 0;
211 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
213 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
216 static int tsk_importance(struct tipc_sock *tsk)
218 return msg_importance(&tsk->phdr);
221 static int tsk_set_importance(struct tipc_sock *tsk, int imp)
223 if (imp > TIPC_CRITICAL_IMPORTANCE)
225 msg_set_importance(&tsk->phdr, (u32)imp);
229 static struct tipc_sock *tipc_sk(const struct sock *sk)
231 return container_of(sk, struct tipc_sock, sk);
234 static int tsk_conn_cong(struct tipc_sock *tsk)
236 return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
240 * tsk_advance_rx_queue - discard first buffer in socket receive queue
242 * Caller must hold socket lock
244 static void tsk_advance_rx_queue(struct sock *sk)
246 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
250 * tsk_rej_rx_queue - reject all buffers in socket receive queue
252 * Caller must hold socket lock
254 static void tsk_rej_rx_queue(struct sock *sk)
258 u32 own_node = tsk_own_node(tipc_sk(sk));
260 while ((skb = __skb_dequeue(&sk->sk_receive_queue))) {
261 if (tipc_msg_reverse(own_node, skb, &dnode, TIPC_ERR_NO_PORT))
262 tipc_link_xmit_skb(sock_net(sk), skb, dnode, 0);
266 /* tsk_peer_msg - verify if message was sent by connected port's peer
268 * Handles cases where the node's network address has changed from
269 * the default of <0.0.0> to its configured setting.
271 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
273 struct tipc_net *tn = net_generic(sock_net(&tsk->sk), tipc_net_id);
274 u32 peer_port = tsk_peer_port(tsk);
278 if (unlikely(!tsk->connected))
281 if (unlikely(msg_origport(msg) != peer_port))
284 orig_node = msg_orignode(msg);
285 peer_node = tsk_peer_node(tsk);
287 if (likely(orig_node == peer_node))
290 if (!orig_node && (peer_node == tn->own_addr))
293 if (!peer_node && (orig_node == tn->own_addr))
300 * tipc_sk_create - create a TIPC socket
301 * @net: network namespace (must be default network)
302 * @sock: pre-allocated socket structure
303 * @protocol: protocol indicator (must be 0)
304 * @kern: caused by kernel or by userspace?
306 * This routine creates additional data structures used by the TIPC socket,
307 * initializes them, and links them together.
309 * Returns 0 on success, errno otherwise
311 static int tipc_sk_create(struct net *net, struct socket *sock,
312 int protocol, int kern)
315 const struct proto_ops *ops;
318 struct tipc_sock *tsk;
319 struct tipc_msg *msg;
321 /* Validate arguments */
322 if (unlikely(protocol != 0))
323 return -EPROTONOSUPPORT;
325 switch (sock->type) {
328 state = SS_UNCONNECTED;
332 state = SS_UNCONNECTED;
343 /* Allocate socket's protocol area */
344 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto);
349 tsk->max_pkt = MAX_PKT_DEFAULT;
350 INIT_LIST_HEAD(&tsk->publications);
352 tn = net_generic(sock_net(sk), tipc_net_id);
353 tipc_msg_init(tn->own_addr, msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
356 /* Finish initializing socket data structures */
359 sock_init_data(sock, sk);
360 if (tipc_sk_insert(tsk)) {
361 pr_warn("Socket create failed; port numbrer exhausted\n");
364 msg_set_origport(msg, tsk->portid);
365 setup_timer(&sk->sk_timer, tipc_sk_timeout, (unsigned long)tsk);
366 sk->sk_backlog_rcv = tipc_backlog_rcv;
367 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
368 sk->sk_data_ready = tipc_data_ready;
369 sk->sk_write_space = tipc_write_space;
370 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
371 tsk->sent_unacked = 0;
372 atomic_set(&tsk->dupl_rcvcnt, 0);
374 if (sock->state == SS_READY) {
375 tsk_set_unreturnable(tsk, true);
376 if (sock->type == SOCK_DGRAM)
377 tsk_set_unreliable(tsk, true);
382 static void tipc_sk_callback(struct rcu_head *head)
384 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
390 * tipc_release - destroy a TIPC socket
391 * @sock: socket to destroy
393 * This routine cleans up any messages that are still queued on the socket.
394 * For DGRAM and RDM socket types, all queued messages are rejected.
395 * For SEQPACKET and STREAM socket types, the first message is rejected
396 * and any others are discarded. (If the first message on a STREAM socket
397 * is partially-read, it is discarded and the next one is rejected instead.)
399 * NOTE: Rejected messages are not necessarily returned to the sender! They
400 * are returned or discarded according to the "destination droppable" setting
401 * specified for the message by the sender.
403 * Returns 0 on success, errno otherwise
405 static int tipc_release(struct socket *sock)
407 struct sock *sk = sock->sk;
409 struct tipc_sock *tsk;
411 u32 dnode, probing_state;
414 * Exit if socket isn't fully initialized (occurs when a failed accept()
415 * releases a pre-allocated child socket that was never used)
425 * Reject all unreceived messages, except on an active connection
426 * (which disconnects locally & sends a 'FIN+' to peer)
428 dnode = tsk_peer_node(tsk);
429 while (sock->state != SS_DISCONNECTING) {
430 skb = __skb_dequeue(&sk->sk_receive_queue);
433 if (TIPC_SKB_CB(skb)->handle != NULL)
436 if ((sock->state == SS_CONNECTING) ||
437 (sock->state == SS_CONNECTED)) {
438 sock->state = SS_DISCONNECTING;
440 tipc_node_remove_conn(net, dnode, tsk->portid);
442 if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode,
444 tipc_link_xmit_skb(net, skb, dnode, 0);
448 tipc_sk_withdraw(tsk, 0, NULL);
449 probing_state = tsk->probing_state;
450 if (del_timer_sync(&sk->sk_timer) &&
451 probing_state != TIPC_CONN_PROBING)
454 if (tsk->connected) {
455 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
456 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
457 tsk_own_node(tsk), tsk_peer_port(tsk),
458 tsk->portid, TIPC_ERR_NO_PORT);
460 tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
461 tipc_node_remove_conn(net, dnode, tsk->portid);
464 /* Discard any remaining (connection-based) messages in receive queue */
465 __skb_queue_purge(&sk->sk_receive_queue);
467 /* Reject any messages that accumulated in backlog queue */
468 sock->state = SS_DISCONNECTING;
471 call_rcu(&tsk->rcu, tipc_sk_callback);
478 * tipc_bind - associate or disassocate TIPC name(s) with a socket
479 * @sock: socket structure
480 * @uaddr: socket address describing name(s) and desired operation
481 * @uaddr_len: size of socket address data structure
483 * Name and name sequence binding is indicated using a positive scope value;
484 * a negative scope value unbinds the specified name. Specifying no name
485 * (i.e. a socket address length of 0) unbinds all names from the socket.
487 * Returns 0 on success, errno otherwise
489 * NOTE: This routine doesn't need to take the socket lock since it doesn't
490 * access any non-constant socket information.
492 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
495 struct sock *sk = sock->sk;
496 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
497 struct tipc_sock *tsk = tipc_sk(sk);
501 if (unlikely(!uaddr_len)) {
502 res = tipc_sk_withdraw(tsk, 0, NULL);
506 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
510 if (addr->family != AF_TIPC) {
515 if (addr->addrtype == TIPC_ADDR_NAME)
516 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
517 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
522 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
523 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
524 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
529 res = (addr->scope > 0) ?
530 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
531 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
538 * tipc_getname - get port ID of socket or peer socket
539 * @sock: socket structure
540 * @uaddr: area for returned socket address
541 * @uaddr_len: area for returned length of socket address
542 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
544 * Returns 0 on success, errno otherwise
546 * NOTE: This routine doesn't need to take the socket lock since it only
547 * accesses socket information that is unchanging (or which changes in
548 * a completely predictable manner).
550 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
551 int *uaddr_len, int peer)
553 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
554 struct tipc_sock *tsk = tipc_sk(sock->sk);
555 struct tipc_net *tn = net_generic(sock_net(sock->sk), tipc_net_id);
557 memset(addr, 0, sizeof(*addr));
559 if ((sock->state != SS_CONNECTED) &&
560 ((peer != 2) || (sock->state != SS_DISCONNECTING)))
562 addr->addr.id.ref = tsk_peer_port(tsk);
563 addr->addr.id.node = tsk_peer_node(tsk);
565 addr->addr.id.ref = tsk->portid;
566 addr->addr.id.node = tn->own_addr;
569 *uaddr_len = sizeof(*addr);
570 addr->addrtype = TIPC_ADDR_ID;
571 addr->family = AF_TIPC;
573 addr->addr.name.domain = 0;
579 * tipc_poll - read and possibly block on pollmask
580 * @file: file structure associated with the socket
581 * @sock: socket for which to calculate the poll bits
584 * Returns pollmask value
587 * It appears that the usual socket locking mechanisms are not useful here
588 * since the pollmask info is potentially out-of-date the moment this routine
589 * exits. TCP and other protocols seem to rely on higher level poll routines
590 * to handle any preventable race conditions, so TIPC will do the same ...
592 * TIPC sets the returned events as follows:
594 * socket state flags set
595 * ------------ ---------
596 * unconnected no read flags
597 * POLLOUT if port is not congested
599 * connecting POLLIN/POLLRDNORM if ACK/NACK in rx queue
602 * connected POLLIN/POLLRDNORM if data in rx queue
603 * POLLOUT if port is not congested
605 * disconnecting POLLIN/POLLRDNORM/POLLHUP
608 * listening POLLIN if SYN in rx queue
611 * ready POLLIN/POLLRDNORM if data in rx queue
612 * [connectionless] POLLOUT (since port cannot be congested)
614 * IMPORTANT: The fact that a read or write operation is indicated does NOT
615 * imply that the operation will succeed, merely that it should be performed
616 * and will not block.
618 static unsigned int tipc_poll(struct file *file, struct socket *sock,
621 struct sock *sk = sock->sk;
622 struct tipc_sock *tsk = tipc_sk(sk);
625 sock_poll_wait(file, sk_sleep(sk), wait);
627 switch ((int)sock->state) {
634 if (!tsk->link_cong && !tsk_conn_cong(tsk))
639 if (!skb_queue_empty(&sk->sk_receive_queue))
640 mask |= (POLLIN | POLLRDNORM);
642 case SS_DISCONNECTING:
643 mask = (POLLIN | POLLRDNORM | POLLHUP);
651 * tipc_sendmcast - send multicast message
652 * @sock: socket structure
653 * @seq: destination address
654 * @msg: message to send
655 * @dsz: total length of message data
656 * @timeo: timeout to wait for wakeup
658 * Called from function tipc_sendmsg(), which has done all sanity checks
659 * Returns the number of bytes sent on success, or errno
661 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
662 struct msghdr *msg, size_t dsz, long timeo)
664 struct sock *sk = sock->sk;
665 struct tipc_sock *tsk = tipc_sk(sk);
666 struct net *net = sock_net(sk);
667 struct tipc_msg *mhdr = &tsk->phdr;
668 struct sk_buff_head *pktchain = &sk->sk_write_queue;
669 struct iov_iter save = msg->msg_iter;
673 msg_set_type(mhdr, TIPC_MCAST_MSG);
674 msg_set_lookup_scope(mhdr, TIPC_CLUSTER_SCOPE);
675 msg_set_destport(mhdr, 0);
676 msg_set_destnode(mhdr, 0);
677 msg_set_nametype(mhdr, seq->type);
678 msg_set_namelower(mhdr, seq->lower);
679 msg_set_nameupper(mhdr, seq->upper);
680 msg_set_hdr_sz(mhdr, MCAST_H_SIZE);
683 mtu = tipc_bclink_get_mtu();
684 rc = tipc_msg_build(mhdr, msg, 0, dsz, mtu, pktchain);
685 if (unlikely(rc < 0))
689 rc = tipc_bclink_xmit(net, pktchain);
690 if (likely(rc >= 0)) {
694 if (rc == -EMSGSIZE) {
695 msg->msg_iter = save;
698 if (rc != -ELINKCONG)
700 tipc_sk(sk)->link_cong = 1;
701 rc = tipc_wait_for_sndmsg(sock, &timeo);
703 __skb_queue_purge(pktchain);
709 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
710 * @arrvq: queue with arriving messages, to be cloned after destination lookup
711 * @inputq: queue with cloned messages, delivered to socket after dest lookup
713 * Multi-threaded: parallel calls with reference to same queues may occur
715 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
716 struct sk_buff_head *inputq)
718 struct tipc_msg *msg;
719 struct tipc_plist dports;
721 u32 scope = TIPC_CLUSTER_SCOPE;
722 struct sk_buff_head tmpq;
724 struct sk_buff *skb, *_skb;
726 __skb_queue_head_init(&tmpq);
727 tipc_plist_init(&dports);
729 skb = tipc_skb_peek(arrvq, &inputq->lock);
730 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
732 hsz = skb_headroom(skb) + msg_hdr_sz(msg);
734 if (in_own_node(net, msg_orignode(msg)))
735 scope = TIPC_NODE_SCOPE;
737 /* Create destination port list and message clones: */
738 tipc_nametbl_mc_translate(net,
739 msg_nametype(msg), msg_namelower(msg),
740 msg_nameupper(msg), scope, &dports);
741 portid = tipc_plist_pop(&dports);
742 for (; portid; portid = tipc_plist_pop(&dports)) {
743 _skb = __pskb_copy(skb, hsz, GFP_ATOMIC);
745 msg_set_destport(buf_msg(_skb), portid);
746 __skb_queue_tail(&tmpq, _skb);
749 pr_warn("Failed to clone mcast rcv buffer\n");
751 /* Append to inputq if not already done by other thread */
752 spin_lock_bh(&inputq->lock);
753 if (skb_peek(arrvq) == skb) {
754 skb_queue_splice_tail_init(&tmpq, inputq);
755 kfree_skb(__skb_dequeue(arrvq));
757 spin_unlock_bh(&inputq->lock);
758 __skb_queue_purge(&tmpq);
761 tipc_sk_rcv(net, inputq);
765 * tipc_sk_proto_rcv - receive a connection mng protocol message
766 * @tsk: receiving socket
767 * @skb: pointer to message buffer. Set to NULL if buffer is consumed.
769 static void tipc_sk_proto_rcv(struct tipc_sock *tsk, struct sk_buff **skb)
771 struct tipc_msg *msg = buf_msg(*skb);
774 u32 own_node = tsk_own_node(tsk);
775 /* Ignore if connection cannot be validated: */
776 if (!tsk_peer_msg(tsk, msg))
779 tsk->probing_state = TIPC_CONN_OK;
781 if (msg_type(msg) == CONN_ACK) {
782 conn_cong = tsk_conn_cong(tsk);
783 tsk->sent_unacked -= msg_msgcnt(msg);
785 tsk->sk.sk_write_space(&tsk->sk);
786 } else if (msg_type(msg) == CONN_PROBE) {
787 if (tipc_msg_reverse(own_node, *skb, &dnode, TIPC_OK)) {
788 msg_set_type(msg, CONN_PROBE_REPLY);
792 /* Do nothing if msg_type() == CONN_PROBE_REPLY */
798 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p)
800 struct sock *sk = sock->sk;
801 struct tipc_sock *tsk = tipc_sk(sk);
806 int err = sock_error(sk);
809 if (sock->state == SS_DISCONNECTING)
813 if (signal_pending(current))
814 return sock_intr_errno(*timeo_p);
816 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
817 done = sk_wait_event(sk, timeo_p, !tsk->link_cong);
818 finish_wait(sk_sleep(sk), &wait);
824 * tipc_sendmsg - send message in connectionless manner
825 * @sock: socket structure
826 * @m: message to send
827 * @dsz: amount of user data to be sent
829 * Message must have an destination specified explicitly.
830 * Used for SOCK_RDM and SOCK_DGRAM messages,
831 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
832 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
834 * Returns the number of bytes sent on success, or errno otherwise
836 static int tipc_sendmsg(struct socket *sock,
837 struct msghdr *m, size_t dsz)
839 struct sock *sk = sock->sk;
843 ret = __tipc_sendmsg(sock, m, dsz);
849 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz)
851 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
852 struct sock *sk = sock->sk;
853 struct tipc_sock *tsk = tipc_sk(sk);
854 struct net *net = sock_net(sk);
855 struct tipc_msg *mhdr = &tsk->phdr;
857 struct sk_buff_head *pktchain = &sk->sk_write_queue;
859 struct tipc_name_seq *seq;
860 struct iov_iter save;
865 if (dsz > TIPC_MAX_USER_MSG_SIZE)
867 if (unlikely(!dest)) {
868 if (tsk->connected && sock->state == SS_READY)
871 return -EDESTADDRREQ;
872 } else if (unlikely(m->msg_namelen < sizeof(*dest)) ||
873 dest->family != AF_TIPC) {
876 if (unlikely(sock->state != SS_READY)) {
877 if (sock->state == SS_LISTENING)
879 if (sock->state != SS_UNCONNECTED)
883 if (dest->addrtype == TIPC_ADDR_NAME) {
884 tsk->conn_type = dest->addr.name.name.type;
885 tsk->conn_instance = dest->addr.name.name.instance;
888 seq = &dest->addr.nameseq;
889 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
891 if (dest->addrtype == TIPC_ADDR_MCAST) {
892 return tipc_sendmcast(sock, seq, m, dsz, timeo);
893 } else if (dest->addrtype == TIPC_ADDR_NAME) {
894 u32 type = dest->addr.name.name.type;
895 u32 inst = dest->addr.name.name.instance;
896 u32 domain = dest->addr.name.domain;
899 msg_set_type(mhdr, TIPC_NAMED_MSG);
900 msg_set_hdr_sz(mhdr, NAMED_H_SIZE);
901 msg_set_nametype(mhdr, type);
902 msg_set_nameinst(mhdr, inst);
903 msg_set_lookup_scope(mhdr, tipc_addr_scope(domain));
904 dport = tipc_nametbl_translate(net, type, inst, &dnode);
905 msg_set_destnode(mhdr, dnode);
906 msg_set_destport(mhdr, dport);
907 if (unlikely(!dport && !dnode))
908 return -EHOSTUNREACH;
909 } else if (dest->addrtype == TIPC_ADDR_ID) {
910 dnode = dest->addr.id.node;
911 msg_set_type(mhdr, TIPC_DIRECT_MSG);
912 msg_set_lookup_scope(mhdr, 0);
913 msg_set_destnode(mhdr, dnode);
914 msg_set_destport(mhdr, dest->addr.id.ref);
915 msg_set_hdr_sz(mhdr, BASIC_H_SIZE);
920 mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
921 rc = tipc_msg_build(mhdr, m, 0, dsz, mtu, pktchain);
926 skb = skb_peek(pktchain);
927 TIPC_SKB_CB(skb)->wakeup_pending = tsk->link_cong;
928 rc = tipc_link_xmit(net, pktchain, dnode, tsk->portid);
929 if (likely(rc >= 0)) {
930 if (sock->state != SS_READY)
931 sock->state = SS_CONNECTING;
935 if (rc == -EMSGSIZE) {
939 if (rc != -ELINKCONG)
942 rc = tipc_wait_for_sndmsg(sock, &timeo);
944 __skb_queue_purge(pktchain);
950 static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
952 struct sock *sk = sock->sk;
953 struct tipc_sock *tsk = tipc_sk(sk);
958 int err = sock_error(sk);
961 if (sock->state == SS_DISCONNECTING)
963 else if (sock->state != SS_CONNECTED)
967 if (signal_pending(current))
968 return sock_intr_errno(*timeo_p);
970 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
971 done = sk_wait_event(sk, timeo_p,
973 !tsk_conn_cong(tsk)) ||
975 finish_wait(sk_sleep(sk), &wait);
981 * tipc_send_stream - send stream-oriented data
982 * @sock: socket structure
984 * @dsz: total length of data to be transmitted
986 * Used for SOCK_STREAM data.
988 * Returns the number of bytes sent on success (or partial success),
989 * or errno if no data sent
991 static int tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
993 struct sock *sk = sock->sk;
997 ret = __tipc_send_stream(sock, m, dsz);
1003 static int __tipc_send_stream(struct socket *sock, struct msghdr *m, size_t dsz)
1005 struct sock *sk = sock->sk;
1006 struct net *net = sock_net(sk);
1007 struct tipc_sock *tsk = tipc_sk(sk);
1008 struct tipc_msg *mhdr = &tsk->phdr;
1009 struct sk_buff_head *pktchain = &sk->sk_write_queue;
1010 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1011 u32 portid = tsk->portid;
1015 uint mtu, send, sent = 0;
1016 struct iov_iter save;
1018 /* Handle implied connection establishment */
1019 if (unlikely(dest)) {
1020 rc = __tipc_sendmsg(sock, m, dsz);
1021 if (dsz && (dsz == rc))
1022 tsk->sent_unacked = 1;
1025 if (dsz > (uint)INT_MAX)
1028 if (unlikely(sock->state != SS_CONNECTED)) {
1029 if (sock->state == SS_DISCONNECTING)
1035 timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1036 dnode = tsk_peer_node(tsk);
1041 send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
1042 rc = tipc_msg_build(mhdr, m, sent, send, mtu, pktchain);
1043 if (unlikely(rc < 0))
1046 if (likely(!tsk_conn_cong(tsk))) {
1047 rc = tipc_link_xmit(net, pktchain, dnode, portid);
1049 tsk->sent_unacked++;
1055 if (rc == -EMSGSIZE) {
1056 tsk->max_pkt = tipc_node_get_mtu(net, dnode,
1061 if (rc != -ELINKCONG)
1065 rc = tipc_wait_for_sndpkt(sock, &timeo);
1067 __skb_queue_purge(pktchain);
1070 return sent ? sent : rc;
1074 * tipc_send_packet - send a connection-oriented message
1075 * @sock: socket structure
1076 * @m: message to send
1077 * @dsz: length of data to be transmitted
1079 * Used for SOCK_SEQPACKET messages.
1081 * Returns the number of bytes sent on success, or errno otherwise
1083 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1085 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1088 return tipc_send_stream(sock, m, dsz);
1091 /* tipc_sk_finish_conn - complete the setup of a connection
1093 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1096 struct sock *sk = &tsk->sk;
1097 struct net *net = sock_net(sk);
1098 struct tipc_msg *msg = &tsk->phdr;
1100 msg_set_destnode(msg, peer_node);
1101 msg_set_destport(msg, peer_port);
1102 msg_set_type(msg, TIPC_CONN_MSG);
1103 msg_set_lookup_scope(msg, 0);
1104 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1106 tsk->probing_intv = CONN_PROBING_INTERVAL;
1107 tsk->probing_state = TIPC_CONN_OK;
1109 sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv);
1110 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1111 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
1115 * set_orig_addr - capture sender's address for received message
1116 * @m: descriptor for message info
1117 * @msg: received message header
1119 * Note: Address is not captured if not requested by receiver.
1121 static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
1123 DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
1126 addr->family = AF_TIPC;
1127 addr->addrtype = TIPC_ADDR_ID;
1128 memset(&addr->addr, 0, sizeof(addr->addr));
1129 addr->addr.id.ref = msg_origport(msg);
1130 addr->addr.id.node = msg_orignode(msg);
1131 addr->addr.name.domain = 0; /* could leave uninitialized */
1132 addr->scope = 0; /* could leave uninitialized */
1133 m->msg_namelen = sizeof(struct sockaddr_tipc);
1138 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1139 * @m: descriptor for message info
1140 * @msg: received message header
1141 * @tsk: TIPC port associated with message
1143 * Note: Ancillary data is not captured if not requested by receiver.
1145 * Returns 0 if successful, otherwise errno
1147 static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
1148 struct tipc_sock *tsk)
1156 if (likely(m->msg_controllen == 0))
1159 /* Optionally capture errored message object(s) */
1160 err = msg ? msg_errcode(msg) : 0;
1161 if (unlikely(err)) {
1163 anc_data[1] = msg_data_sz(msg);
1164 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1168 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1175 /* Optionally capture message destination object */
1176 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1177 switch (dest_type) {
1178 case TIPC_NAMED_MSG:
1180 anc_data[0] = msg_nametype(msg);
1181 anc_data[1] = msg_namelower(msg);
1182 anc_data[2] = msg_namelower(msg);
1184 case TIPC_MCAST_MSG:
1186 anc_data[0] = msg_nametype(msg);
1187 anc_data[1] = msg_namelower(msg);
1188 anc_data[2] = msg_nameupper(msg);
1191 has_name = (tsk->conn_type != 0);
1192 anc_data[0] = tsk->conn_type;
1193 anc_data[1] = tsk->conn_instance;
1194 anc_data[2] = tsk->conn_instance;
1200 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1208 static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
1210 struct net *net = sock_net(&tsk->sk);
1211 struct sk_buff *skb = NULL;
1212 struct tipc_msg *msg;
1213 u32 peer_port = tsk_peer_port(tsk);
1214 u32 dnode = tsk_peer_node(tsk);
1216 if (!tsk->connected)
1218 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1219 dnode, tsk_own_node(tsk), peer_port,
1220 tsk->portid, TIPC_OK);
1224 msg_set_msgcnt(msg, ack);
1225 tipc_link_xmit_skb(net, skb, dnode, msg_link_selector(msg));
1228 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1230 struct sock *sk = sock->sk;
1232 long timeo = *timeop;
1236 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1237 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1238 if (sock->state == SS_DISCONNECTING) {
1243 timeo = schedule_timeout(timeo);
1247 if (!skb_queue_empty(&sk->sk_receive_queue))
1252 err = sock_intr_errno(timeo);
1253 if (signal_pending(current))
1256 finish_wait(sk_sleep(sk), &wait);
1262 * tipc_recvmsg - receive packet-oriented message
1263 * @m: descriptor for message info
1264 * @buf_len: total size of user buffer area
1265 * @flags: receive flags
1267 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1268 * If the complete message doesn't fit in user area, truncate it.
1270 * Returns size of returned message data, errno otherwise
1272 static int tipc_recvmsg(struct socket *sock, struct msghdr *m, size_t buf_len,
1275 struct sock *sk = sock->sk;
1276 struct tipc_sock *tsk = tipc_sk(sk);
1277 struct sk_buff *buf;
1278 struct tipc_msg *msg;
1284 /* Catch invalid receive requests */
1285 if (unlikely(!buf_len))
1290 if (unlikely(sock->state == SS_UNCONNECTED)) {
1295 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1298 /* Look for a message in receive queue; wait if necessary */
1299 res = tipc_wait_for_rcvmsg(sock, &timeo);
1303 /* Look at first message in receive queue */
1304 buf = skb_peek(&sk->sk_receive_queue);
1306 sz = msg_data_sz(msg);
1307 err = msg_errcode(msg);
1309 /* Discard an empty non-errored message & try again */
1310 if ((!sz) && (!err)) {
1311 tsk_advance_rx_queue(sk);
1315 /* Capture sender's address (optional) */
1316 set_orig_addr(m, msg);
1318 /* Capture ancillary data (optional) */
1319 res = tipc_sk_anc_data_recv(m, msg, tsk);
1323 /* Capture message data (if valid) & compute return value (always) */
1325 if (unlikely(buf_len < sz)) {
1327 m->msg_flags |= MSG_TRUNC;
1329 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg), m, sz);
1334 if ((sock->state == SS_READY) ||
1335 ((err == TIPC_CONN_SHUTDOWN) || m->msg_control))
1341 /* Consume received message (optional) */
1342 if (likely(!(flags & MSG_PEEK))) {
1343 if ((sock->state != SS_READY) &&
1344 (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1345 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1346 tsk->rcv_unacked = 0;
1348 tsk_advance_rx_queue(sk);
1356 * tipc_recv_stream - receive stream-oriented data
1357 * @m: descriptor for message info
1358 * @buf_len: total size of user buffer area
1359 * @flags: receive flags
1361 * Used for SOCK_STREAM messages only. If not enough data is available
1362 * will optionally wait for more; never truncates data.
1364 * Returns size of returned message data, errno otherwise
1366 static int tipc_recv_stream(struct socket *sock, struct msghdr *m,
1367 size_t buf_len, int flags)
1369 struct sock *sk = sock->sk;
1370 struct tipc_sock *tsk = tipc_sk(sk);
1371 struct sk_buff *buf;
1372 struct tipc_msg *msg;
1375 int sz_to_copy, target, needed;
1380 /* Catch invalid receive attempts */
1381 if (unlikely(!buf_len))
1386 if (unlikely(sock->state == SS_UNCONNECTED)) {
1391 target = sock_rcvlowat(sk, flags & MSG_WAITALL, buf_len);
1392 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1395 /* Look for a message in receive queue; wait if necessary */
1396 res = tipc_wait_for_rcvmsg(sock, &timeo);
1400 /* Look at first message in receive queue */
1401 buf = skb_peek(&sk->sk_receive_queue);
1403 sz = msg_data_sz(msg);
1404 err = msg_errcode(msg);
1406 /* Discard an empty non-errored message & try again */
1407 if ((!sz) && (!err)) {
1408 tsk_advance_rx_queue(sk);
1412 /* Optionally capture sender's address & ancillary data of first msg */
1413 if (sz_copied == 0) {
1414 set_orig_addr(m, msg);
1415 res = tipc_sk_anc_data_recv(m, msg, tsk);
1420 /* Capture message data (if valid) & compute return value (always) */
1422 u32 offset = (u32)(unsigned long)(TIPC_SKB_CB(buf)->handle);
1425 needed = (buf_len - sz_copied);
1426 sz_to_copy = (sz <= needed) ? sz : needed;
1428 res = skb_copy_datagram_msg(buf, msg_hdr_sz(msg) + offset,
1433 sz_copied += sz_to_copy;
1435 if (sz_to_copy < sz) {
1436 if (!(flags & MSG_PEEK))
1437 TIPC_SKB_CB(buf)->handle =
1438 (void *)(unsigned long)(offset + sz_to_copy);
1443 goto exit; /* can't add error msg to valid data */
1445 if ((err == TIPC_CONN_SHUTDOWN) || m->msg_control)
1451 /* Consume received message (optional) */
1452 if (likely(!(flags & MSG_PEEK))) {
1453 if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
1454 tipc_sk_send_ack(tsk, tsk->rcv_unacked);
1455 tsk->rcv_unacked = 0;
1457 tsk_advance_rx_queue(sk);
1460 /* Loop around if more data is required */
1461 if ((sz_copied < buf_len) && /* didn't get all requested data */
1462 (!skb_queue_empty(&sk->sk_receive_queue) ||
1463 (sz_copied < target)) && /* and more is ready or required */
1464 (!(flags & MSG_PEEK)) && /* and aren't just peeking at data */
1465 (!err)) /* and haven't reached a FIN */
1470 return sz_copied ? sz_copied : res;
1474 * tipc_write_space - wake up thread if port congestion is released
1477 static void tipc_write_space(struct sock *sk)
1479 struct socket_wq *wq;
1482 wq = rcu_dereference(sk->sk_wq);
1483 if (wq_has_sleeper(wq))
1484 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1485 POLLWRNORM | POLLWRBAND);
1490 * tipc_data_ready - wake up threads to indicate messages have been received
1492 * @len: the length of messages
1494 static void tipc_data_ready(struct sock *sk)
1496 struct socket_wq *wq;
1499 wq = rcu_dereference(sk->sk_wq);
1500 if (wq_has_sleeper(wq))
1501 wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1502 POLLRDNORM | POLLRDBAND);
1507 * filter_connect - Handle all incoming messages for a connection-based socket
1509 * @skb: pointer to message buffer. Set to NULL if buffer is consumed
1511 * Returns 0 (TIPC_OK) if everything ok, -TIPC_ERR_NO_PORT otherwise
1513 static int filter_connect(struct tipc_sock *tsk, struct sk_buff **skb)
1515 struct sock *sk = &tsk->sk;
1516 struct net *net = sock_net(sk);
1517 struct socket *sock = sk->sk_socket;
1518 struct tipc_msg *msg = buf_msg(*skb);
1519 int retval = -TIPC_ERR_NO_PORT;
1524 switch ((int)sock->state) {
1526 /* Accept only connection-based messages sent by peer */
1527 if (tsk_peer_msg(tsk, msg)) {
1528 if (unlikely(msg_errcode(msg))) {
1529 sock->state = SS_DISCONNECTING;
1531 /* let timer expire on it's own */
1532 tipc_node_remove_conn(net, tsk_peer_node(tsk),
1539 /* Accept only ACK or NACK message */
1541 if (unlikely(!msg_connected(msg)))
1544 if (unlikely(msg_errcode(msg))) {
1545 sock->state = SS_DISCONNECTING;
1546 sk->sk_err = ECONNREFUSED;
1551 if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
1552 sock->state = SS_DISCONNECTING;
1553 sk->sk_err = EINVAL;
1558 tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg));
1559 msg_set_importance(&tsk->phdr, msg_importance(msg));
1560 sock->state = SS_CONNECTED;
1562 /* If an incoming message is an 'ACK-', it should be
1563 * discarded here because it doesn't contain useful
1564 * data. In addition, we should try to wake up
1565 * connect() routine if sleeping.
1567 if (msg_data_sz(msg) == 0) {
1570 if (waitqueue_active(sk_sleep(sk)))
1571 wake_up_interruptible(sk_sleep(sk));
1576 case SS_UNCONNECTED:
1577 /* Accept only SYN message */
1578 if (!msg_connected(msg) && !(msg_errcode(msg)))
1581 case SS_DISCONNECTING:
1584 pr_err("Unknown socket state %u\n", sock->state);
1590 * rcvbuf_limit - get proper overload limit of socket receive queue
1594 * For all connection oriented messages, irrespective of importance,
1595 * the default overload value (i.e. 67MB) is set as limit.
1597 * For all connectionless messages, by default new queue limits are
1600 * TIPC_LOW_IMPORTANCE (4 MB)
1601 * TIPC_MEDIUM_IMPORTANCE (8 MB)
1602 * TIPC_HIGH_IMPORTANCE (16 MB)
1603 * TIPC_CRITICAL_IMPORTANCE (32 MB)
1605 * Returns overload limit according to corresponding message importance
1607 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *buf)
1609 struct tipc_msg *msg = buf_msg(buf);
1611 if (msg_connected(msg))
1612 return sysctl_tipc_rmem[2];
1614 return sk->sk_rcvbuf >> TIPC_CRITICAL_IMPORTANCE <<
1615 msg_importance(msg);
1619 * filter_rcv - validate incoming message
1621 * @skb: pointer to message. Set to NULL if buffer is consumed.
1623 * Enqueues message on receive queue if acceptable; optionally handles
1624 * disconnect indication for a connected socket.
1626 * Called with socket lock already taken
1628 * Returns 0 (TIPC_OK) if message was ok, -TIPC error code if rejected
1630 static int filter_rcv(struct sock *sk, struct sk_buff **skb)
1632 struct socket *sock = sk->sk_socket;
1633 struct tipc_sock *tsk = tipc_sk(sk);
1634 struct tipc_msg *msg = buf_msg(*skb);
1635 unsigned int limit = rcvbuf_limit(sk, *skb);
1638 if (unlikely(msg_user(msg) == CONN_MANAGER)) {
1639 tipc_sk_proto_rcv(tsk, skb);
1643 if (unlikely(msg_user(msg) == SOCK_WAKEUP)) {
1646 sk->sk_write_space(sk);
1651 /* Reject message if it is wrong sort of message for socket */
1652 if (msg_type(msg) > TIPC_DIRECT_MSG)
1653 return -TIPC_ERR_NO_PORT;
1655 if (sock->state == SS_READY) {
1656 if (msg_connected(msg))
1657 return -TIPC_ERR_NO_PORT;
1659 rc = filter_connect(tsk, skb);
1660 if (rc != TIPC_OK || !*skb)
1664 /* Reject message if there isn't room to queue it */
1665 if (sk_rmem_alloc_get(sk) + (*skb)->truesize >= limit)
1666 return -TIPC_ERR_OVERLOAD;
1668 /* Enqueue message */
1669 TIPC_SKB_CB(*skb)->handle = NULL;
1670 __skb_queue_tail(&sk->sk_receive_queue, *skb);
1671 skb_set_owner_r(*skb, sk);
1673 sk->sk_data_ready(sk);
1679 * tipc_backlog_rcv - handle incoming message from backlog queue
1683 * Caller must hold socket lock
1687 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb)
1692 struct tipc_sock *tsk = tipc_sk(sk);
1693 struct net *net = sock_net(sk);
1694 uint truesize = skb->truesize;
1696 err = filter_rcv(sk, &skb);
1698 dcnt = &tsk->dupl_rcvcnt;
1699 if (atomic_read(dcnt) < TIPC_CONN_OVERLOAD_LIMIT)
1700 atomic_add(truesize, dcnt);
1703 if (!err || tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode, -err))
1704 tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
1709 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
1710 * inputq and try adding them to socket or backlog queue
1711 * @inputq: list of incoming buffers with potentially different destinations
1712 * @sk: socket where the buffers should be enqueued
1713 * @dport: port number for the socket
1714 * @_skb: returned buffer to be forwarded or rejected, if applicable
1716 * Caller must hold socket lock
1718 * Returns TIPC_OK if all buffers enqueued, otherwise -TIPC_ERR_OVERLOAD
1719 * or -TIPC_ERR_NO_PORT
1721 static int tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
1722 u32 dport, struct sk_buff **_skb)
1727 struct sk_buff *skb;
1728 unsigned long time_limit = jiffies + 2;
1730 while (skb_queue_len(inputq)) {
1731 if (unlikely(time_after_eq(jiffies, time_limit)))
1733 skb = tipc_skb_dequeue(inputq, dport);
1736 if (!sock_owned_by_user(sk)) {
1737 err = filter_rcv(sk, &skb);
1743 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
1744 if (sk->sk_backlog.len)
1745 atomic_set(dcnt, 0);
1746 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
1747 if (likely(!sk_add_backlog(sk, skb, lim)))
1750 return -TIPC_ERR_OVERLOAD;
1756 * tipc_sk_rcv - handle a chain of incoming buffers
1757 * @inputq: buffer list containing the buffers
1758 * Consumes all buffers in list until inputq is empty
1759 * Note: may be called in multiple threads referring to the same queue
1760 * Returns 0 if last buffer was accepted, otherwise -EHOSTUNREACH
1761 * Only node local calls check the return value, sending single-buffer queues
1763 int tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
1765 u32 dnode, dport = 0;
1766 int err = -TIPC_ERR_NO_PORT;
1767 struct sk_buff *skb;
1768 struct tipc_sock *tsk;
1769 struct tipc_net *tn;
1772 while (skb_queue_len(inputq)) {
1774 dport = tipc_skb_peek_port(inputq, dport);
1775 tsk = tipc_sk_lookup(net, dport);
1778 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
1779 err = tipc_sk_enqueue(inputq, sk, dport, &skb);
1780 spin_unlock_bh(&sk->sk_lock.slock);
1785 skb = tipc_skb_dequeue(inputq, dport);
1789 if (tipc_msg_lookup_dest(net, skb, &dnode, &err))
1792 dnode = msg_destnode(buf_msg(skb));
1795 tn = net_generic(net, tipc_net_id);
1796 if (!tipc_msg_reverse(tn->own_addr, skb, &dnode, -err))
1799 tipc_link_xmit_skb(net, skb, dnode, dport);
1801 return err ? -EHOSTUNREACH : 0;
1804 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
1806 struct sock *sk = sock->sk;
1811 int err = sock_error(sk);
1816 if (signal_pending(current))
1817 return sock_intr_errno(*timeo_p);
1819 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
1820 done = sk_wait_event(sk, timeo_p, sock->state != SS_CONNECTING);
1821 finish_wait(sk_sleep(sk), &wait);
1827 * tipc_connect - establish a connection to another TIPC port
1828 * @sock: socket structure
1829 * @dest: socket address for destination port
1830 * @destlen: size of socket address data structure
1831 * @flags: file-related flags associated with socket
1833 * Returns 0 on success, errno otherwise
1835 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
1836 int destlen, int flags)
1838 struct sock *sk = sock->sk;
1839 struct tipc_sock *tsk = tipc_sk(sk);
1840 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
1841 struct msghdr m = {NULL,};
1842 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
1843 socket_state previous;
1848 /* DGRAM/RDM connect(), just save the destaddr */
1849 if (sock->state == SS_READY) {
1850 if (dst->family == AF_UNSPEC) {
1851 memset(&tsk->remote, 0, sizeof(struct sockaddr_tipc));
1854 memcpy(&tsk->remote, dest, destlen);
1861 * Reject connection attempt using multicast address
1863 * Note: send_msg() validates the rest of the address fields,
1864 * so there's no need to do it here
1866 if (dst->addrtype == TIPC_ADDR_MCAST) {
1871 previous = sock->state;
1872 switch (sock->state) {
1873 case SS_UNCONNECTED:
1874 /* Send a 'SYN-' to destination */
1876 m.msg_namelen = destlen;
1878 /* If connect is in non-blocking case, set MSG_DONTWAIT to
1879 * indicate send_msg() is never blocked.
1882 m.msg_flags = MSG_DONTWAIT;
1884 res = __tipc_sendmsg(sock, &m, 0);
1885 if ((res < 0) && (res != -EWOULDBLOCK))
1888 /* Just entered SS_CONNECTING state; the only
1889 * difference is that return value in non-blocking
1890 * case is EINPROGRESS, rather than EALREADY.
1894 if (previous == SS_CONNECTING)
1898 timeout = msecs_to_jiffies(timeout);
1899 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
1900 res = tipc_wait_for_connect(sock, &timeout);
1915 * tipc_listen - allow socket to listen for incoming connections
1916 * @sock: socket structure
1919 * Returns 0 on success, errno otherwise
1921 static int tipc_listen(struct socket *sock, int len)
1923 struct sock *sk = sock->sk;
1928 if (sock->state != SS_UNCONNECTED)
1931 sock->state = SS_LISTENING;
1939 static int tipc_wait_for_accept(struct socket *sock, long timeo)
1941 struct sock *sk = sock->sk;
1945 /* True wake-one mechanism for incoming connections: only
1946 * one process gets woken up, not the 'whole herd'.
1947 * Since we do not 'race & poll' for established sockets
1948 * anymore, the common case will execute the loop only once.
1951 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
1952 TASK_INTERRUPTIBLE);
1953 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1955 timeo = schedule_timeout(timeo);
1959 if (!skb_queue_empty(&sk->sk_receive_queue))
1962 if (sock->state != SS_LISTENING)
1967 err = sock_intr_errno(timeo);
1968 if (signal_pending(current))
1971 finish_wait(sk_sleep(sk), &wait);
1976 * tipc_accept - wait for connection request
1977 * @sock: listening socket
1978 * @newsock: new socket that is to be connected
1979 * @flags: file-related flags associated with socket
1981 * Returns 0 on success, errno otherwise
1983 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
1985 struct sock *new_sk, *sk = sock->sk;
1986 struct sk_buff *buf;
1987 struct tipc_sock *new_tsock;
1988 struct tipc_msg *msg;
1994 if (sock->state != SS_LISTENING) {
1998 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
1999 res = tipc_wait_for_accept(sock, timeo);
2003 buf = skb_peek(&sk->sk_receive_queue);
2005 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, 1);
2009 new_sk = new_sock->sk;
2010 new_tsock = tipc_sk(new_sk);
2013 /* we lock on new_sk; but lockdep sees the lock on sk */
2014 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2017 * Reject any stray messages received by new socket
2018 * before the socket lock was taken (very, very unlikely)
2020 tsk_rej_rx_queue(new_sk);
2022 /* Connect new socket to it's peer */
2023 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2024 new_sock->state = SS_CONNECTED;
2026 tsk_set_importance(new_tsock, msg_importance(msg));
2027 if (msg_named(msg)) {
2028 new_tsock->conn_type = msg_nametype(msg);
2029 new_tsock->conn_instance = msg_nameinst(msg);
2033 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2034 * Respond to 'SYN+' by queuing it on new socket.
2036 if (!msg_data_sz(msg)) {
2037 struct msghdr m = {NULL,};
2039 tsk_advance_rx_queue(sk);
2040 __tipc_send_stream(new_sock, &m, 0);
2042 __skb_dequeue(&sk->sk_receive_queue);
2043 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2044 skb_set_owner_r(buf, new_sk);
2046 release_sock(new_sk);
2053 * tipc_shutdown - shutdown socket connection
2054 * @sock: socket structure
2055 * @how: direction to close (must be SHUT_RDWR)
2057 * Terminates connection (if necessary), then purges socket's receive queue.
2059 * Returns 0 on success, errno otherwise
2061 static int tipc_shutdown(struct socket *sock, int how)
2063 struct sock *sk = sock->sk;
2064 struct net *net = sock_net(sk);
2065 struct tipc_sock *tsk = tipc_sk(sk);
2066 struct sk_buff *skb;
2070 if (how != SHUT_RDWR)
2075 switch (sock->state) {
2080 /* Disconnect and send a 'FIN+' or 'FIN-' message to peer */
2081 skb = __skb_dequeue(&sk->sk_receive_queue);
2083 if (TIPC_SKB_CB(skb)->handle != NULL) {
2087 if (tipc_msg_reverse(tsk_own_node(tsk), skb, &dnode,
2088 TIPC_CONN_SHUTDOWN))
2089 tipc_link_xmit_skb(net, skb, dnode,
2092 dnode = tsk_peer_node(tsk);
2094 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2095 TIPC_CONN_MSG, SHORT_H_SIZE,
2096 0, dnode, tsk_own_node(tsk),
2098 tsk->portid, TIPC_CONN_SHUTDOWN);
2099 tipc_link_xmit_skb(net, skb, dnode, tsk->portid);
2102 sock->state = SS_DISCONNECTING;
2103 tipc_node_remove_conn(net, dnode, tsk->portid);
2106 case SS_DISCONNECTING:
2108 /* Discard any unreceived messages */
2109 __skb_queue_purge(&sk->sk_receive_queue);
2111 /* Wake up anyone sleeping in poll */
2112 sk->sk_state_change(sk);
2124 static void tipc_sk_timeout(unsigned long data)
2126 struct tipc_sock *tsk = (struct tipc_sock *)data;
2127 struct sock *sk = &tsk->sk;
2128 struct sk_buff *skb = NULL;
2129 u32 peer_port, peer_node;
2130 u32 own_node = tsk_own_node(tsk);
2133 if (!tsk->connected) {
2137 peer_port = tsk_peer_port(tsk);
2138 peer_node = tsk_peer_node(tsk);
2140 if (tsk->probing_state == TIPC_CONN_PROBING) {
2141 /* Previous probe not answered -> self abort */
2142 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
2143 TIPC_CONN_MSG, SHORT_H_SIZE, 0,
2144 own_node, peer_node, tsk->portid,
2145 peer_port, TIPC_ERR_NO_PORT);
2147 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE,
2148 INT_H_SIZE, 0, peer_node, own_node,
2149 peer_port, tsk->portid, TIPC_OK);
2150 tsk->probing_state = TIPC_CONN_PROBING;
2151 sk_reset_timer(sk, &sk->sk_timer, jiffies + tsk->probing_intv);
2155 tipc_link_xmit_skb(sock_net(sk), skb, peer_node, tsk->portid);
2160 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2161 struct tipc_name_seq const *seq)
2163 struct net *net = sock_net(&tsk->sk);
2164 struct publication *publ;
2169 key = tsk->portid + tsk->pub_count + 1;
2170 if (key == tsk->portid)
2173 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2174 scope, tsk->portid, key);
2175 if (unlikely(!publ))
2178 list_add(&publ->pport_list, &tsk->publications);
2184 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2185 struct tipc_name_seq const *seq)
2187 struct net *net = sock_net(&tsk->sk);
2188 struct publication *publ;
2189 struct publication *safe;
2192 list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
2194 if (publ->scope != scope)
2196 if (publ->type != seq->type)
2198 if (publ->lower != seq->lower)
2200 if (publ->upper != seq->upper)
2202 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2203 publ->ref, publ->key);
2207 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2208 publ->ref, publ->key);
2211 if (list_empty(&tsk->publications))
2216 /* tipc_sk_reinit: set non-zero address in all existing sockets
2217 * when we go from standalone to network mode.
2219 void tipc_sk_reinit(struct net *net)
2221 struct tipc_net *tn = net_generic(net, tipc_net_id);
2222 const struct bucket_table *tbl;
2223 struct rhash_head *pos;
2224 struct tipc_sock *tsk;
2225 struct tipc_msg *msg;
2229 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
2230 for (i = 0; i < tbl->size; i++) {
2231 rht_for_each_entry_rcu(tsk, pos, tbl, i, node) {
2232 spin_lock_bh(&tsk->sk.sk_lock.slock);
2234 msg_set_prevnode(msg, tn->own_addr);
2235 msg_set_orignode(msg, tn->own_addr);
2236 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2242 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2244 struct tipc_net *tn = net_generic(net, tipc_net_id);
2245 struct tipc_sock *tsk;
2248 tsk = rhashtable_lookup(&tn->sk_rht, &portid);
2250 sock_hold(&tsk->sk);
2256 static int tipc_sk_insert(struct tipc_sock *tsk)
2258 struct sock *sk = &tsk->sk;
2259 struct net *net = sock_net(sk);
2260 struct tipc_net *tn = net_generic(net, tipc_net_id);
2261 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2262 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2264 while (remaining--) {
2266 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2267 portid = TIPC_MIN_PORT;
2268 tsk->portid = portid;
2269 sock_hold(&tsk->sk);
2270 if (rhashtable_lookup_insert(&tn->sk_rht, &tsk->node))
2278 static void tipc_sk_remove(struct tipc_sock *tsk)
2280 struct sock *sk = &tsk->sk;
2281 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
2283 if (rhashtable_remove(&tn->sk_rht, &tsk->node)) {
2284 WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
2289 int tipc_sk_rht_init(struct net *net)
2291 struct tipc_net *tn = net_generic(net, tipc_net_id);
2292 struct rhashtable_params rht_params = {
2294 .head_offset = offsetof(struct tipc_sock, node),
2295 .key_offset = offsetof(struct tipc_sock, portid),
2296 .key_len = sizeof(u32), /* portid */
2298 .max_size = 1048576,
2302 return rhashtable_init(&tn->sk_rht, &rht_params);
2305 void tipc_sk_rht_destroy(struct net *net)
2307 struct tipc_net *tn = net_generic(net, tipc_net_id);
2309 /* Wait for socket readers to complete */
2312 rhashtable_destroy(&tn->sk_rht);
2316 * tipc_setsockopt - set socket option
2317 * @sock: socket structure
2318 * @lvl: option level
2319 * @opt: option identifier
2320 * @ov: pointer to new option value
2321 * @ol: length of option value
2323 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
2324 * (to ease compatibility).
2326 * Returns 0 on success, errno otherwise
2328 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
2329 char __user *ov, unsigned int ol)
2331 struct sock *sk = sock->sk;
2332 struct tipc_sock *tsk = tipc_sk(sk);
2336 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2338 if (lvl != SOL_TIPC)
2339 return -ENOPROTOOPT;
2340 if (ol < sizeof(value))
2342 res = get_user(value, (u32 __user *)ov);
2349 case TIPC_IMPORTANCE:
2350 res = tsk_set_importance(tsk, value);
2352 case TIPC_SRC_DROPPABLE:
2353 if (sock->type != SOCK_STREAM)
2354 tsk_set_unreliable(tsk, value);
2358 case TIPC_DEST_DROPPABLE:
2359 tsk_set_unreturnable(tsk, value);
2361 case TIPC_CONN_TIMEOUT:
2362 tipc_sk(sk)->conn_timeout = value;
2363 /* no need to set "res", since already 0 at this point */
2375 * tipc_getsockopt - get socket option
2376 * @sock: socket structure
2377 * @lvl: option level
2378 * @opt: option identifier
2379 * @ov: receptacle for option value
2380 * @ol: receptacle for length of option value
2382 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
2383 * (to ease compatibility).
2385 * Returns 0 on success, errno otherwise
2387 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
2388 char __user *ov, int __user *ol)
2390 struct sock *sk = sock->sk;
2391 struct tipc_sock *tsk = tipc_sk(sk);
2396 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
2397 return put_user(0, ol);
2398 if (lvl != SOL_TIPC)
2399 return -ENOPROTOOPT;
2400 res = get_user(len, ol);
2407 case TIPC_IMPORTANCE:
2408 value = tsk_importance(tsk);
2410 case TIPC_SRC_DROPPABLE:
2411 value = tsk_unreliable(tsk);
2413 case TIPC_DEST_DROPPABLE:
2414 value = tsk_unreturnable(tsk);
2416 case TIPC_CONN_TIMEOUT:
2417 value = tsk->conn_timeout;
2418 /* no need to set "res", since already 0 at this point */
2420 case TIPC_NODE_RECVQ_DEPTH:
2421 value = 0; /* was tipc_queue_size, now obsolete */
2423 case TIPC_SOCK_RECVQ_DEPTH:
2424 value = skb_queue_len(&sk->sk_receive_queue);
2433 return res; /* "get" failed */
2435 if (len < sizeof(value))
2438 if (copy_to_user(ov, &value, sizeof(value)))
2441 return put_user(sizeof(value), ol);
2444 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
2446 struct sock *sk = sock->sk;
2447 struct tipc_sioc_ln_req lnr;
2448 void __user *argp = (void __user *)arg;
2451 case SIOCGETLINKNAME:
2452 if (copy_from_user(&lnr, argp, sizeof(lnr)))
2454 if (!tipc_node_get_linkname(sock_net(sk),
2455 lnr.bearer_id & 0xffff, lnr.peer,
2456 lnr.linkname, TIPC_MAX_LINK_NAME)) {
2457 if (copy_to_user(argp, &lnr, sizeof(lnr)))
2461 return -EADDRNOTAVAIL;
2463 return -ENOIOCTLCMD;
2467 /* Protocol switches for the various types of TIPC sockets */
2469 static const struct proto_ops msg_ops = {
2470 .owner = THIS_MODULE,
2472 .release = tipc_release,
2474 .connect = tipc_connect,
2475 .socketpair = sock_no_socketpair,
2476 .accept = sock_no_accept,
2477 .getname = tipc_getname,
2479 .ioctl = tipc_ioctl,
2480 .listen = sock_no_listen,
2481 .shutdown = tipc_shutdown,
2482 .setsockopt = tipc_setsockopt,
2483 .getsockopt = tipc_getsockopt,
2484 .sendmsg = tipc_sendmsg,
2485 .recvmsg = tipc_recvmsg,
2486 .mmap = sock_no_mmap,
2487 .sendpage = sock_no_sendpage
2490 static const struct proto_ops packet_ops = {
2491 .owner = THIS_MODULE,
2493 .release = tipc_release,
2495 .connect = tipc_connect,
2496 .socketpair = sock_no_socketpair,
2497 .accept = tipc_accept,
2498 .getname = tipc_getname,
2500 .ioctl = tipc_ioctl,
2501 .listen = tipc_listen,
2502 .shutdown = tipc_shutdown,
2503 .setsockopt = tipc_setsockopt,
2504 .getsockopt = tipc_getsockopt,
2505 .sendmsg = tipc_send_packet,
2506 .recvmsg = tipc_recvmsg,
2507 .mmap = sock_no_mmap,
2508 .sendpage = sock_no_sendpage
2511 static const struct proto_ops stream_ops = {
2512 .owner = THIS_MODULE,
2514 .release = tipc_release,
2516 .connect = tipc_connect,
2517 .socketpair = sock_no_socketpair,
2518 .accept = tipc_accept,
2519 .getname = tipc_getname,
2521 .ioctl = tipc_ioctl,
2522 .listen = tipc_listen,
2523 .shutdown = tipc_shutdown,
2524 .setsockopt = tipc_setsockopt,
2525 .getsockopt = tipc_getsockopt,
2526 .sendmsg = tipc_send_stream,
2527 .recvmsg = tipc_recv_stream,
2528 .mmap = sock_no_mmap,
2529 .sendpage = sock_no_sendpage
2532 static const struct net_proto_family tipc_family_ops = {
2533 .owner = THIS_MODULE,
2535 .create = tipc_sk_create
2538 static struct proto tipc_proto = {
2540 .owner = THIS_MODULE,
2541 .obj_size = sizeof(struct tipc_sock),
2542 .sysctl_rmem = sysctl_tipc_rmem
2546 * tipc_socket_init - initialize TIPC socket interface
2548 * Returns 0 on success, errno otherwise
2550 int tipc_socket_init(void)
2554 res = proto_register(&tipc_proto, 1);
2556 pr_err("Failed to register TIPC protocol type\n");
2560 res = sock_register(&tipc_family_ops);
2562 pr_err("Failed to register TIPC socket type\n");
2563 proto_unregister(&tipc_proto);
2571 * tipc_socket_stop - stop TIPC socket interface
2573 void tipc_socket_stop(void)
2575 sock_unregister(tipc_family_ops.family);
2576 proto_unregister(&tipc_proto);
2579 /* Caller should hold socket lock for the passed tipc socket. */
2580 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
2584 struct nlattr *nest;
2586 peer_node = tsk_peer_node(tsk);
2587 peer_port = tsk_peer_port(tsk);
2589 nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
2591 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
2593 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
2596 if (tsk->conn_type != 0) {
2597 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
2599 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
2601 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
2604 nla_nest_end(skb, nest);
2609 nla_nest_cancel(skb, nest);
2614 /* Caller should hold socket lock for the passed tipc socket. */
2615 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
2616 struct tipc_sock *tsk)
2620 struct nlattr *attrs;
2621 struct net *net = sock_net(skb->sk);
2622 struct tipc_net *tn = net_generic(net, tipc_net_id);
2624 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2625 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
2629 attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
2631 goto genlmsg_cancel;
2632 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid))
2633 goto attr_msg_cancel;
2634 if (nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tn->own_addr))
2635 goto attr_msg_cancel;
2637 if (tsk->connected) {
2638 err = __tipc_nl_add_sk_con(skb, tsk);
2640 goto attr_msg_cancel;
2641 } else if (!list_empty(&tsk->publications)) {
2642 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
2643 goto attr_msg_cancel;
2645 nla_nest_end(skb, attrs);
2646 genlmsg_end(skb, hdr);
2651 nla_nest_cancel(skb, attrs);
2653 genlmsg_cancel(skb, hdr);
2658 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
2661 struct tipc_sock *tsk;
2662 const struct bucket_table *tbl;
2663 struct rhash_head *pos;
2664 struct net *net = sock_net(skb->sk);
2665 struct tipc_net *tn = net_generic(net, tipc_net_id);
2666 u32 tbl_id = cb->args[0];
2667 u32 prev_portid = cb->args[1];
2670 tbl = rht_dereference_rcu((&tn->sk_rht)->tbl, &tn->sk_rht);
2671 for (; tbl_id < tbl->size; tbl_id++) {
2672 rht_for_each_entry_rcu(tsk, pos, tbl, tbl_id, node) {
2673 spin_lock_bh(&tsk->sk.sk_lock.slock);
2674 if (prev_portid && prev_portid != tsk->portid) {
2675 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2679 err = __tipc_nl_add_sk(skb, cb, tsk);
2681 prev_portid = tsk->portid;
2682 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2686 spin_unlock_bh(&tsk->sk.sk_lock.slock);
2691 cb->args[0] = tbl_id;
2692 cb->args[1] = prev_portid;
2697 /* Caller should hold socket lock for the passed tipc socket. */
2698 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
2699 struct netlink_callback *cb,
2700 struct publication *publ)
2703 struct nlattr *attrs;
2705 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2706 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
2710 attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
2712 goto genlmsg_cancel;
2714 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
2715 goto attr_msg_cancel;
2716 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
2717 goto attr_msg_cancel;
2718 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
2719 goto attr_msg_cancel;
2720 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
2721 goto attr_msg_cancel;
2723 nla_nest_end(skb, attrs);
2724 genlmsg_end(skb, hdr);
2729 nla_nest_cancel(skb, attrs);
2731 genlmsg_cancel(skb, hdr);
2736 /* Caller should hold socket lock for the passed tipc socket. */
2737 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
2738 struct netlink_callback *cb,
2739 struct tipc_sock *tsk, u32 *last_publ)
2742 struct publication *p;
2745 list_for_each_entry(p, &tsk->publications, pport_list) {
2746 if (p->key == *last_publ)
2749 if (p->key != *last_publ) {
2750 /* We never set seq or call nl_dump_check_consistent()
2751 * this means that setting prev_seq here will cause the
2752 * consistence check to fail in the netlink callback
2753 * handler. Resulting in the last NLMSG_DONE message
2754 * having the NLM_F_DUMP_INTR flag set.
2761 p = list_first_entry(&tsk->publications, struct publication,
2765 list_for_each_entry_from(p, &tsk->publications, pport_list) {
2766 err = __tipc_nl_add_sk_publ(skb, cb, p);
2768 *last_publ = p->key;
2777 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
2780 u32 tsk_portid = cb->args[0];
2781 u32 last_publ = cb->args[1];
2782 u32 done = cb->args[2];
2783 struct net *net = sock_net(skb->sk);
2784 struct tipc_sock *tsk;
2787 struct nlattr **attrs;
2788 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
2790 err = tipc_nlmsg_parse(cb->nlh, &attrs);
2794 err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
2795 attrs[TIPC_NLA_SOCK],
2796 tipc_nl_sock_policy);
2800 if (!sock[TIPC_NLA_SOCK_REF])
2803 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
2809 tsk = tipc_sk_lookup(net, tsk_portid);
2813 lock_sock(&tsk->sk);
2814 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
2817 release_sock(&tsk->sk);
2820 cb->args[0] = tsk_portid;
2821 cb->args[1] = last_publ;