2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2017, 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
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31 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34 * POSSIBILITY OF SUCH DAMAGE.
37 #include <linux/rhashtable.h>
38 #include <linux/sched/signal.h>
41 #include "name_table.h"
44 #include "name_distr.h"
51 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
52 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
53 #define TIPC_FWD_MSG 1
54 #define TIPC_MAX_PORT 0xffffffff
55 #define TIPC_MIN_PORT 1
56 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of of rcv window size */
59 TIPC_LISTEN = TCP_LISTEN,
60 TIPC_ESTABLISHED = TCP_ESTABLISHED,
61 TIPC_OPEN = TCP_CLOSE,
62 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
63 TIPC_CONNECTING = TCP_SYN_SENT,
66 struct sockaddr_pair {
67 struct sockaddr_tipc sock;
68 struct sockaddr_tipc member;
72 * struct tipc_sock - TIPC socket structure
73 * @sk: socket - interacts with 'port' and with user via the socket API
74 * @conn_type: TIPC type used when connection was established
75 * @conn_instance: TIPC instance used when connection was established
76 * @published: non-zero if port has one or more associated names
77 * @max_pkt: maximum packet size "hint" used when building messages sent by port
78 * @maxnagle: maximum size of msg which can be subject to nagle
79 * @portid: unique port identity in TIPC socket hash table
80 * @phdr: preformatted message header used when sending messages
81 * #cong_links: list of congested links
82 * @publications: list of publications for port
83 * @blocking_link: address of the congested link we are currently sleeping on
84 * @pub_count: total # of publications port has made during its lifetime
85 * @conn_timeout: the time we can wait for an unresponded setup request
86 * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
87 * @cong_link_cnt: number of congested links
88 * @snt_unacked: # messages sent by socket, and not yet acked by peer
89 * @rcv_unacked: # messages read by user, but not yet acked back to peer
90 * @peer: 'connected' peer for dgram/rdm
91 * @node: hash table node
92 * @mc_method: cookie for use between socket and broadcast layer
93 * @rcu: rcu struct for tipc_sock
103 struct tipc_msg phdr;
104 struct list_head cong_links;
105 struct list_head publications;
107 atomic_t dupl_rcvcnt;
116 struct sockaddr_tipc peer;
117 struct rhash_head node;
118 struct tipc_mc_method mc_method;
120 struct tipc_group *group;
128 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
129 static void tipc_data_ready(struct sock *sk);
130 static void tipc_write_space(struct sock *sk);
131 static void tipc_sock_destruct(struct sock *sk);
132 static int tipc_release(struct socket *sock);
133 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
135 static void tipc_sk_timeout(struct timer_list *t);
136 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
137 struct tipc_name_seq const *seq);
138 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
139 struct tipc_name_seq const *seq);
140 static int tipc_sk_leave(struct tipc_sock *tsk);
141 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
142 static int tipc_sk_insert(struct tipc_sock *tsk);
143 static void tipc_sk_remove(struct tipc_sock *tsk);
144 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
145 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
146 static void tipc_sk_push_backlog(struct tipc_sock *tsk);
148 static const struct proto_ops packet_ops;
149 static const struct proto_ops stream_ops;
150 static const struct proto_ops msg_ops;
151 static struct proto tipc_proto;
152 static const struct rhashtable_params tsk_rht_params;
154 static u32 tsk_own_node(struct tipc_sock *tsk)
156 return msg_prevnode(&tsk->phdr);
159 static u32 tsk_peer_node(struct tipc_sock *tsk)
161 return msg_destnode(&tsk->phdr);
164 static u32 tsk_peer_port(struct tipc_sock *tsk)
166 return msg_destport(&tsk->phdr);
169 static bool tsk_unreliable(struct tipc_sock *tsk)
171 return msg_src_droppable(&tsk->phdr) != 0;
174 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
176 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
179 static bool tsk_unreturnable(struct tipc_sock *tsk)
181 return msg_dest_droppable(&tsk->phdr) != 0;
184 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
186 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
189 static int tsk_importance(struct tipc_sock *tsk)
191 return msg_importance(&tsk->phdr);
194 static int tsk_set_importance(struct tipc_sock *tsk, int imp)
196 if (imp > TIPC_CRITICAL_IMPORTANCE)
198 msg_set_importance(&tsk->phdr, (u32)imp);
202 static struct tipc_sock *tipc_sk(const struct sock *sk)
204 return container_of(sk, struct tipc_sock, sk);
207 static bool tsk_conn_cong(struct tipc_sock *tsk)
209 return tsk->snt_unacked > tsk->snd_win;
212 static u16 tsk_blocks(int len)
214 return ((len / FLOWCTL_BLK_SZ) + 1);
217 /* tsk_blocks(): translate a buffer size in bytes to number of
218 * advertisable blocks, taking into account the ratio truesize(len)/len
219 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
221 static u16 tsk_adv_blocks(int len)
223 return len / FLOWCTL_BLK_SZ / 4;
226 /* tsk_inc(): increment counter for sent or received data
227 * - If block based flow control is not supported by peer we
228 * fall back to message based ditto, incrementing the counter
230 static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
232 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
233 return ((msglen / FLOWCTL_BLK_SZ) + 1);
237 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
239 static void tsk_set_nagle(struct tipc_sock *tsk)
241 struct sock *sk = &tsk->sk;
244 if (sk->sk_type != SOCK_STREAM)
248 if (!(tsk->peer_caps & TIPC_NAGLE))
250 /* Limit node local buffer size to avoid receive queue overflow */
251 if (tsk->max_pkt == MAX_MSG_SIZE)
252 tsk->maxnagle = 1500;
254 tsk->maxnagle = tsk->max_pkt;
258 * tsk_advance_rx_queue - discard first buffer in socket receive queue
260 * Caller must hold socket lock
262 static void tsk_advance_rx_queue(struct sock *sk)
264 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
265 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
268 /* tipc_sk_respond() : send response message back to sender
270 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
274 u32 onode = tipc_own_addr(sock_net(sk));
276 if (!tipc_msg_reverse(onode, &skb, err))
279 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
280 dnode = msg_destnode(buf_msg(skb));
281 selector = msg_origport(buf_msg(skb));
282 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
286 * tsk_rej_rx_queue - reject all buffers in socket receive queue
288 * Caller must hold socket lock
290 static void tsk_rej_rx_queue(struct sock *sk)
294 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
295 tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
298 static bool tipc_sk_connected(struct sock *sk)
300 return sk->sk_state == TIPC_ESTABLISHED;
303 /* tipc_sk_type_connectionless - check if the socket is datagram socket
306 * Returns true if connection less, false otherwise
308 static bool tipc_sk_type_connectionless(struct sock *sk)
310 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
313 /* tsk_peer_msg - verify if message was sent by connected port's peer
315 * Handles cases where the node's network address has changed from
316 * the default of <0.0.0> to its configured setting.
318 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
320 struct sock *sk = &tsk->sk;
321 u32 self = tipc_own_addr(sock_net(sk));
322 u32 peer_port = tsk_peer_port(tsk);
323 u32 orig_node, peer_node;
325 if (unlikely(!tipc_sk_connected(sk)))
328 if (unlikely(msg_origport(msg) != peer_port))
331 orig_node = msg_orignode(msg);
332 peer_node = tsk_peer_node(tsk);
334 if (likely(orig_node == peer_node))
337 if (!orig_node && peer_node == self)
340 if (!peer_node && orig_node == self)
346 /* tipc_set_sk_state - set the sk_state of the socket
349 * Caller must hold socket lock
351 * Returns 0 on success, errno otherwise
353 static int tipc_set_sk_state(struct sock *sk, int state)
355 int oldsk_state = sk->sk_state;
363 case TIPC_CONNECTING:
364 if (oldsk_state == TIPC_OPEN)
367 case TIPC_ESTABLISHED:
368 if (oldsk_state == TIPC_CONNECTING ||
369 oldsk_state == TIPC_OPEN)
372 case TIPC_DISCONNECTING:
373 if (oldsk_state == TIPC_CONNECTING ||
374 oldsk_state == TIPC_ESTABLISHED)
380 sk->sk_state = state;
385 static int tipc_sk_sock_err(struct socket *sock, long *timeout)
387 struct sock *sk = sock->sk;
388 int err = sock_error(sk);
389 int typ = sock->type;
393 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
394 if (sk->sk_state == TIPC_DISCONNECTING)
396 else if (!tipc_sk_connected(sk))
401 if (signal_pending(current))
402 return sock_intr_errno(*timeout);
407 #define tipc_wait_for_cond(sock_, timeo_, condition_) \
409 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
413 while ((rc_ = !(condition_))) { \
414 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
417 rc_ = tipc_sk_sock_err((sock_), timeo_); \
420 add_wait_queue(sk_sleep(sk_), &wait_); \
422 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
423 sched_annotate_sleep(); \
425 remove_wait_queue(sk_sleep(sk_), &wait_); \
431 * tipc_sk_create - create a TIPC socket
432 * @net: network namespace (must be default network)
433 * @sock: pre-allocated socket structure
434 * @protocol: protocol indicator (must be 0)
435 * @kern: caused by kernel or by userspace?
437 * This routine creates additional data structures used by the TIPC socket,
438 * initializes them, and links them together.
440 * Returns 0 on success, errno otherwise
442 static int tipc_sk_create(struct net *net, struct socket *sock,
443 int protocol, int kern)
445 const struct proto_ops *ops;
447 struct tipc_sock *tsk;
448 struct tipc_msg *msg;
450 /* Validate arguments */
451 if (unlikely(protocol != 0))
452 return -EPROTONOSUPPORT;
454 switch (sock->type) {
469 /* Allocate socket's protocol area */
470 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
475 tsk->max_pkt = MAX_PKT_DEFAULT;
477 INIT_LIST_HEAD(&tsk->publications);
478 INIT_LIST_HEAD(&tsk->cong_links);
481 /* Finish initializing socket data structures */
483 sock_init_data(sock, sk);
484 tipc_set_sk_state(sk, TIPC_OPEN);
485 if (tipc_sk_insert(tsk)) {
486 pr_warn("Socket create failed; port number exhausted\n");
490 /* Ensure tsk is visible before we read own_addr. */
493 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
494 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
496 msg_set_origport(msg, tsk->portid);
497 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
499 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
500 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
501 sk->sk_data_ready = tipc_data_ready;
502 sk->sk_write_space = tipc_write_space;
503 sk->sk_destruct = tipc_sock_destruct;
504 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
505 tsk->group_is_open = true;
506 atomic_set(&tsk->dupl_rcvcnt, 0);
508 /* Start out with safe limits until we receive an advertised window */
509 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
510 tsk->rcv_win = tsk->snd_win;
512 if (tipc_sk_type_connectionless(sk)) {
513 tsk_set_unreturnable(tsk, true);
514 if (sock->type == SOCK_DGRAM)
515 tsk_set_unreliable(tsk, true);
517 __skb_queue_head_init(&tsk->mc_method.deferredq);
518 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
522 static void tipc_sk_callback(struct rcu_head *head)
524 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
529 /* Caller should hold socket lock for the socket. */
530 static void __tipc_shutdown(struct socket *sock, int error)
532 struct sock *sk = sock->sk;
533 struct tipc_sock *tsk = tipc_sk(sk);
534 struct net *net = sock_net(sk);
535 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
536 u32 dnode = tsk_peer_node(tsk);
539 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
540 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
541 !tsk_conn_cong(tsk)));
543 /* Push out delayed messages if in Nagle mode */
544 tipc_sk_push_backlog(tsk);
545 /* Remove pending SYN */
546 __skb_queue_purge(&sk->sk_write_queue);
548 /* Reject all unreceived messages, except on an active connection
549 * (which disconnects locally & sends a 'FIN+' to peer).
551 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
552 if (TIPC_SKB_CB(skb)->bytes_read) {
556 if (!tipc_sk_type_connectionless(sk) &&
557 sk->sk_state != TIPC_DISCONNECTING) {
558 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
559 tipc_node_remove_conn(net, dnode, tsk->portid);
561 tipc_sk_respond(sk, skb, error);
564 if (tipc_sk_type_connectionless(sk))
567 if (sk->sk_state != TIPC_DISCONNECTING) {
568 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
569 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
570 tsk_own_node(tsk), tsk_peer_port(tsk),
573 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
574 tipc_node_remove_conn(net, dnode, tsk->portid);
575 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
580 * tipc_release - destroy a TIPC socket
581 * @sock: socket to destroy
583 * This routine cleans up any messages that are still queued on the socket.
584 * For DGRAM and RDM socket types, all queued messages are rejected.
585 * For SEQPACKET and STREAM socket types, the first message is rejected
586 * and any others are discarded. (If the first message on a STREAM socket
587 * is partially-read, it is discarded and the next one is rejected instead.)
589 * NOTE: Rejected messages are not necessarily returned to the sender! They
590 * are returned or discarded according to the "destination droppable" setting
591 * specified for the message by the sender.
593 * Returns 0 on success, errno otherwise
595 static int tipc_release(struct socket *sock)
597 struct sock *sk = sock->sk;
598 struct tipc_sock *tsk;
601 * Exit if socket isn't fully initialized (occurs when a failed accept()
602 * releases a pre-allocated child socket that was never used)
610 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
611 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
612 sk->sk_shutdown = SHUTDOWN_MASK;
614 tipc_sk_withdraw(tsk, 0, NULL);
615 __skb_queue_purge(&tsk->mc_method.deferredq);
616 sk_stop_timer(sk, &sk->sk_timer);
620 /* Reject any messages that accumulated in backlog queue */
622 tipc_dest_list_purge(&tsk->cong_links);
623 tsk->cong_link_cnt = 0;
624 call_rcu(&tsk->rcu, tipc_sk_callback);
631 * tipc_bind - associate or disassocate TIPC name(s) with a socket
632 * @sock: socket structure
633 * @uaddr: socket address describing name(s) and desired operation
634 * @uaddr_len: size of socket address data structure
636 * Name and name sequence binding is indicated using a positive scope value;
637 * a negative scope value unbinds the specified name. Specifying no name
638 * (i.e. a socket address length of 0) unbinds all names from the socket.
640 * Returns 0 on success, errno otherwise
642 * NOTE: This routine doesn't need to take the socket lock since it doesn't
643 * access any non-constant socket information.
645 static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
648 struct sock *sk = sock->sk;
649 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
650 struct tipc_sock *tsk = tipc_sk(sk);
654 if (unlikely(!uaddr_len)) {
655 res = tipc_sk_withdraw(tsk, 0, NULL);
662 if (uaddr_len < sizeof(struct sockaddr_tipc)) {
666 if (addr->family != AF_TIPC) {
671 if (addr->addrtype == TIPC_ADDR_NAME)
672 addr->addr.nameseq.upper = addr->addr.nameseq.lower;
673 else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
678 if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
679 (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
680 (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
685 res = (addr->scope >= 0) ?
686 tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
687 tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
694 * tipc_getname - get port ID of socket or peer socket
695 * @sock: socket structure
696 * @uaddr: area for returned socket address
697 * @uaddr_len: area for returned length of socket address
698 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
700 * Returns 0 on success, errno otherwise
702 * NOTE: This routine doesn't need to take the socket lock since it only
703 * accesses socket information that is unchanging (or which changes in
704 * a completely predictable manner).
706 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
709 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
710 struct sock *sk = sock->sk;
711 struct tipc_sock *tsk = tipc_sk(sk);
713 memset(addr, 0, sizeof(*addr));
715 if ((!tipc_sk_connected(sk)) &&
716 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
718 addr->addr.id.ref = tsk_peer_port(tsk);
719 addr->addr.id.node = tsk_peer_node(tsk);
721 addr->addr.id.ref = tsk->portid;
722 addr->addr.id.node = tipc_own_addr(sock_net(sk));
725 addr->addrtype = TIPC_ADDR_ID;
726 addr->family = AF_TIPC;
728 addr->addr.name.domain = 0;
730 return sizeof(*addr);
734 * tipc_poll - read and possibly block on pollmask
735 * @file: file structure associated with the socket
736 * @sock: socket for which to calculate the poll bits
739 * Returns pollmask value
742 * It appears that the usual socket locking mechanisms are not useful here
743 * since the pollmask info is potentially out-of-date the moment this routine
744 * exits. TCP and other protocols seem to rely on higher level poll routines
745 * to handle any preventable race conditions, so TIPC will do the same ...
747 * IMPORTANT: The fact that a read or write operation is indicated does NOT
748 * imply that the operation will succeed, merely that it should be performed
749 * and will not block.
751 static __poll_t tipc_poll(struct file *file, struct socket *sock,
754 struct sock *sk = sock->sk;
755 struct tipc_sock *tsk = tipc_sk(sk);
756 __poll_t revents = 0;
758 sock_poll_wait(file, sock, wait);
759 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
761 if (sk->sk_shutdown & RCV_SHUTDOWN)
762 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
763 if (sk->sk_shutdown == SHUTDOWN_MASK)
766 switch (sk->sk_state) {
767 case TIPC_ESTABLISHED:
768 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
772 case TIPC_CONNECTING:
773 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
774 revents |= EPOLLIN | EPOLLRDNORM;
777 if (tsk->group_is_open && !tsk->cong_link_cnt)
779 if (!tipc_sk_type_connectionless(sk))
781 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
783 revents |= EPOLLIN | EPOLLRDNORM;
785 case TIPC_DISCONNECTING:
786 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
793 * tipc_sendmcast - send multicast message
794 * @sock: socket structure
795 * @seq: destination address
796 * @msg: message to send
797 * @dlen: length of data to send
798 * @timeout: timeout to wait for wakeup
800 * Called from function tipc_sendmsg(), which has done all sanity checks
801 * Returns the number of bytes sent on success, or errno
803 static int tipc_sendmcast(struct socket *sock, struct tipc_name_seq *seq,
804 struct msghdr *msg, size_t dlen, long timeout)
806 struct sock *sk = sock->sk;
807 struct tipc_sock *tsk = tipc_sk(sk);
808 struct tipc_msg *hdr = &tsk->phdr;
809 struct net *net = sock_net(sk);
810 int mtu = tipc_bcast_get_mtu(net);
811 struct tipc_mc_method *method = &tsk->mc_method;
812 struct sk_buff_head pkts;
813 struct tipc_nlist dsts;
819 /* Block or return if any destination link is congested */
820 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
824 /* Lookup destination nodes */
825 tipc_nlist_init(&dsts, tipc_own_addr(net));
826 tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
828 if (!dsts.local && !dsts.remote)
829 return -EHOSTUNREACH;
831 /* Build message header */
832 msg_set_type(hdr, TIPC_MCAST_MSG);
833 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
834 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
835 msg_set_destport(hdr, 0);
836 msg_set_destnode(hdr, 0);
837 msg_set_nametype(hdr, seq->type);
838 msg_set_namelower(hdr, seq->lower);
839 msg_set_nameupper(hdr, seq->upper);
841 /* Build message as chain of buffers */
842 __skb_queue_head_init(&pkts);
843 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
845 /* Send message if build was successful */
846 if (unlikely(rc == dlen)) {
847 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
848 TIPC_DUMP_SK_SNDQ, " ");
849 rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
850 &tsk->cong_link_cnt);
853 tipc_nlist_purge(&dsts);
855 return rc ? rc : dlen;
859 * tipc_send_group_msg - send a message to a member in the group
860 * @net: network namespace
861 * @m: message to send
863 * @dnode: destination node
864 * @dport: destination port
865 * @dlen: total length of message data
867 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
868 struct msghdr *m, struct tipc_member *mb,
869 u32 dnode, u32 dport, int dlen)
871 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
872 struct tipc_mc_method *method = &tsk->mc_method;
873 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
874 struct tipc_msg *hdr = &tsk->phdr;
875 struct sk_buff_head pkts;
878 /* Complete message header */
879 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
880 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
881 msg_set_destport(hdr, dport);
882 msg_set_destnode(hdr, dnode);
883 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
885 /* Build message as chain of buffers */
886 __skb_queue_head_init(&pkts);
887 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
888 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
889 if (unlikely(rc != dlen))
893 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
894 if (unlikely(rc == -ELINKCONG)) {
895 tipc_dest_push(&tsk->cong_links, dnode, 0);
896 tsk->cong_link_cnt++;
899 /* Update send window */
900 tipc_group_update_member(mb, blks);
902 /* A broadcast sent within next EXPIRE period must follow same path */
903 method->rcast = true;
904 method->mandatory = true;
909 * tipc_send_group_unicast - send message to a member in the group
910 * @sock: socket structure
911 * @m: message to send
912 * @dlen: total length of message data
913 * @timeout: timeout to wait for wakeup
915 * Called from function tipc_sendmsg(), which has done all sanity checks
916 * Returns the number of bytes sent on success, or errno
918 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
919 int dlen, long timeout)
921 struct sock *sk = sock->sk;
922 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
923 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
924 struct tipc_sock *tsk = tipc_sk(sk);
925 struct net *net = sock_net(sk);
926 struct tipc_member *mb = NULL;
930 node = dest->addr.id.node;
931 port = dest->addr.id.ref;
933 return -EHOSTUNREACH;
935 /* Block or return if destination link or member is congested */
936 rc = tipc_wait_for_cond(sock, &timeout,
937 !tipc_dest_find(&tsk->cong_links, node, 0) &&
939 !tipc_group_cong(tsk->group, node, port, blks,
945 return -EHOSTUNREACH;
947 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
949 return rc ? rc : dlen;
953 * tipc_send_group_anycast - send message to any member with given identity
954 * @sock: socket structure
955 * @m: message to send
956 * @dlen: total length of message data
957 * @timeout: timeout to wait for wakeup
959 * Called from function tipc_sendmsg(), which has done all sanity checks
960 * Returns the number of bytes sent on success, or errno
962 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
963 int dlen, long timeout)
965 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
966 struct sock *sk = sock->sk;
967 struct tipc_sock *tsk = tipc_sk(sk);
968 struct list_head *cong_links = &tsk->cong_links;
969 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
970 struct tipc_msg *hdr = &tsk->phdr;
971 struct tipc_member *first = NULL;
972 struct tipc_member *mbr = NULL;
973 struct net *net = sock_net(sk);
974 u32 node, port, exclude;
975 struct list_head dsts;
976 u32 type, inst, scope;
981 INIT_LIST_HEAD(&dsts);
983 type = msg_nametype(hdr);
984 inst = dest->addr.name.name.instance;
985 scope = msg_lookup_scope(hdr);
987 while (++lookups < 4) {
988 exclude = tipc_group_exclude(tsk->group);
992 /* Look for a non-congested destination member, if any */
994 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
995 &dstcnt, exclude, false))
996 return -EHOSTUNREACH;
997 tipc_dest_pop(&dsts, &node, &port);
998 cong = tipc_group_cong(tsk->group, node, port, blks,
1008 /* Start over if destination was not in member list */
1012 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1015 /* Block or return if destination link or member is congested */
1016 rc = tipc_wait_for_cond(sock, &timeout,
1017 !tipc_dest_find(cong_links, node, 0) &&
1019 !tipc_group_cong(tsk->group, node, port,
1024 /* Send, unless destination disappeared while waiting */
1029 if (unlikely(lookups >= 4))
1030 return -EHOSTUNREACH;
1032 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1034 return rc ? rc : dlen;
1038 * tipc_send_group_bcast - send message to all members in communication group
1039 * @sk: socket structure
1040 * @m: message to send
1041 * @dlen: total length of message data
1042 * @timeout: timeout to wait for wakeup
1044 * Called from function tipc_sendmsg(), which has done all sanity checks
1045 * Returns the number of bytes sent on success, or errno
1047 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1048 int dlen, long timeout)
1050 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1051 struct sock *sk = sock->sk;
1052 struct net *net = sock_net(sk);
1053 struct tipc_sock *tsk = tipc_sk(sk);
1054 struct tipc_nlist *dsts;
1055 struct tipc_mc_method *method = &tsk->mc_method;
1056 bool ack = method->mandatory && method->rcast;
1057 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1058 struct tipc_msg *hdr = &tsk->phdr;
1059 int mtu = tipc_bcast_get_mtu(net);
1060 struct sk_buff_head pkts;
1061 int rc = -EHOSTUNREACH;
1063 /* Block or return if any destination link or member is congested */
1064 rc = tipc_wait_for_cond(sock, &timeout,
1065 !tsk->cong_link_cnt && tsk->group &&
1066 !tipc_group_bc_cong(tsk->group, blks));
1070 dsts = tipc_group_dests(tsk->group);
1071 if (!dsts->local && !dsts->remote)
1072 return -EHOSTUNREACH;
1074 /* Complete message header */
1076 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1077 msg_set_nameinst(hdr, dest->addr.name.name.instance);
1079 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1080 msg_set_nameinst(hdr, 0);
1082 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1083 msg_set_destport(hdr, 0);
1084 msg_set_destnode(hdr, 0);
1085 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1087 /* Avoid getting stuck with repeated forced replicasts */
1088 msg_set_grp_bc_ack_req(hdr, ack);
1090 /* Build message as chain of buffers */
1091 __skb_queue_head_init(&pkts);
1092 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1093 if (unlikely(rc != dlen))
1097 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1101 /* Update broadcast sequence number and send windows */
1102 tipc_group_update_bc_members(tsk->group, blks, ack);
1104 /* Broadcast link is now free to choose method for next broadcast */
1105 method->mandatory = false;
1106 method->expires = jiffies;
1112 * tipc_send_group_mcast - send message to all members with given identity
1113 * @sock: socket structure
1114 * @m: message to send
1115 * @dlen: total length of message data
1116 * @timeout: timeout to wait for wakeup
1118 * Called from function tipc_sendmsg(), which has done all sanity checks
1119 * Returns the number of bytes sent on success, or errno
1121 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1122 int dlen, long timeout)
1124 struct sock *sk = sock->sk;
1125 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1126 struct tipc_sock *tsk = tipc_sk(sk);
1127 struct tipc_group *grp = tsk->group;
1128 struct tipc_msg *hdr = &tsk->phdr;
1129 struct net *net = sock_net(sk);
1130 u32 type, inst, scope, exclude;
1131 struct list_head dsts;
1134 INIT_LIST_HEAD(&dsts);
1136 type = msg_nametype(hdr);
1137 inst = dest->addr.name.name.instance;
1138 scope = msg_lookup_scope(hdr);
1139 exclude = tipc_group_exclude(grp);
1141 if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
1142 &dstcnt, exclude, true))
1143 return -EHOSTUNREACH;
1146 tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
1147 return tipc_send_group_unicast(sock, m, dlen, timeout);
1150 tipc_dest_list_purge(&dsts);
1151 return tipc_send_group_bcast(sock, m, dlen, timeout);
1155 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1156 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1157 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1159 * Multi-threaded: parallel calls with reference to same queues may occur
1161 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1162 struct sk_buff_head *inputq)
1164 u32 self = tipc_own_addr(net);
1165 u32 type, lower, upper, scope;
1166 struct sk_buff *skb, *_skb;
1168 struct sk_buff_head tmpq;
1169 struct list_head dports;
1170 struct tipc_msg *hdr;
1171 int user, mtyp, hlen;
1174 __skb_queue_head_init(&tmpq);
1175 INIT_LIST_HEAD(&dports);
1177 skb = tipc_skb_peek(arrvq, &inputq->lock);
1178 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1180 user = msg_user(hdr);
1181 mtyp = msg_type(hdr);
1182 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1183 onode = msg_orignode(hdr);
1184 type = msg_nametype(hdr);
1186 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1187 spin_lock_bh(&inputq->lock);
1188 if (skb_peek(arrvq) == skb) {
1189 __skb_dequeue(arrvq);
1190 __skb_queue_tail(inputq, skb);
1193 spin_unlock_bh(&inputq->lock);
1197 /* Group messages require exact scope match */
1198 if (msg_in_group(hdr)) {
1201 scope = msg_lookup_scope(hdr);
1204 /* TIPC_NODE_SCOPE means "any scope" in this context */
1206 scope = TIPC_NODE_SCOPE;
1208 scope = TIPC_CLUSTER_SCOPE;
1210 lower = msg_namelower(hdr);
1211 upper = msg_nameupper(hdr);
1214 /* Create destination port list: */
1215 tipc_nametbl_mc_lookup(net, type, lower, upper,
1216 scope, exact, &dports);
1218 /* Clone message per destination */
1219 while (tipc_dest_pop(&dports, NULL, &portid)) {
1220 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1222 msg_set_destport(buf_msg(_skb), portid);
1223 __skb_queue_tail(&tmpq, _skb);
1226 pr_warn("Failed to clone mcast rcv buffer\n");
1228 /* Append to inputq if not already done by other thread */
1229 spin_lock_bh(&inputq->lock);
1230 if (skb_peek(arrvq) == skb) {
1231 skb_queue_splice_tail_init(&tmpq, inputq);
1232 kfree_skb(__skb_dequeue(arrvq));
1234 spin_unlock_bh(&inputq->lock);
1235 __skb_queue_purge(&tmpq);
1238 tipc_sk_rcv(net, inputq);
1241 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1242 * when socket is in Nagle mode
1244 static void tipc_sk_push_backlog(struct tipc_sock *tsk)
1246 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1247 struct net *net = sock_net(&tsk->sk);
1248 u32 dnode = tsk_peer_node(tsk);
1249 struct sk_buff *skb = skb_peek(txq);
1252 if (!skb || tsk->cong_link_cnt)
1255 /* Do not send SYN again after congestion */
1256 if (msg_is_syn(buf_msg(skb)))
1259 tsk->snt_unacked += tsk->snd_backlog;
1260 tsk->snd_backlog = 0;
1261 tsk->expect_ack = true;
1262 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1263 if (rc == -ELINKCONG)
1264 tsk->cong_link_cnt = 1;
1268 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1269 * @tsk: receiving socket
1270 * @skb: pointer to message buffer.
1272 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1273 struct sk_buff_head *inputq,
1274 struct sk_buff_head *xmitq)
1276 struct tipc_msg *hdr = buf_msg(skb);
1277 u32 onode = tsk_own_node(tsk);
1278 struct sock *sk = &tsk->sk;
1279 int mtyp = msg_type(hdr);
1282 /* Ignore if connection cannot be validated: */
1283 if (!tsk_peer_msg(tsk, hdr)) {
1284 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1288 if (unlikely(msg_errcode(hdr))) {
1289 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1290 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1291 tsk_peer_port(tsk));
1292 sk->sk_state_change(sk);
1294 /* State change is ignored if socket already awake,
1295 * - convert msg to abort msg and add to inqueue
1297 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1298 msg_set_type(hdr, TIPC_CONN_MSG);
1299 msg_set_size(hdr, BASIC_H_SIZE);
1300 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1301 __skb_queue_tail(inputq, skb);
1305 tsk->probe_unacked = false;
1307 if (mtyp == CONN_PROBE) {
1308 msg_set_type(hdr, CONN_PROBE_REPLY);
1309 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1310 __skb_queue_tail(xmitq, skb);
1312 } else if (mtyp == CONN_ACK) {
1313 was_cong = tsk_conn_cong(tsk);
1314 tsk->expect_ack = false;
1315 tipc_sk_push_backlog(tsk);
1316 tsk->snt_unacked -= msg_conn_ack(hdr);
1317 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1318 tsk->snd_win = msg_adv_win(hdr);
1319 if (was_cong && !tsk_conn_cong(tsk))
1320 sk->sk_write_space(sk);
1321 } else if (mtyp != CONN_PROBE_REPLY) {
1322 pr_warn("Received unknown CONN_PROTO msg\n");
1329 * tipc_sendmsg - send message in connectionless manner
1330 * @sock: socket structure
1331 * @m: message to send
1332 * @dsz: amount of user data to be sent
1334 * Message must have an destination specified explicitly.
1335 * Used for SOCK_RDM and SOCK_DGRAM messages,
1336 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1337 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1339 * Returns the number of bytes sent on success, or errno otherwise
1341 static int tipc_sendmsg(struct socket *sock,
1342 struct msghdr *m, size_t dsz)
1344 struct sock *sk = sock->sk;
1348 ret = __tipc_sendmsg(sock, m, dsz);
1354 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1356 struct sock *sk = sock->sk;
1357 struct net *net = sock_net(sk);
1358 struct tipc_sock *tsk = tipc_sk(sk);
1359 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1360 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1361 struct list_head *clinks = &tsk->cong_links;
1362 bool syn = !tipc_sk_type_connectionless(sk);
1363 struct tipc_group *grp = tsk->group;
1364 struct tipc_msg *hdr = &tsk->phdr;
1365 struct tipc_name_seq *seq;
1366 struct sk_buff_head pkts;
1367 u32 dport = 0, dnode = 0;
1368 u32 type = 0, inst = 0;
1371 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1375 if (unlikely(m->msg_namelen < sizeof(*dest)))
1377 if (unlikely(dest->family != AF_TIPC))
1383 return tipc_send_group_bcast(sock, m, dlen, timeout);
1384 if (dest->addrtype == TIPC_ADDR_NAME)
1385 return tipc_send_group_anycast(sock, m, dlen, timeout);
1386 if (dest->addrtype == TIPC_ADDR_ID)
1387 return tipc_send_group_unicast(sock, m, dlen, timeout);
1388 if (dest->addrtype == TIPC_ADDR_MCAST)
1389 return tipc_send_group_mcast(sock, m, dlen, timeout);
1393 if (unlikely(!dest)) {
1395 if (!syn && dest->family != AF_TIPC)
1396 return -EDESTADDRREQ;
1399 if (unlikely(syn)) {
1400 if (sk->sk_state == TIPC_LISTEN)
1402 if (sk->sk_state != TIPC_OPEN)
1406 if (dest->addrtype == TIPC_ADDR_NAME) {
1407 tsk->conn_type = dest->addr.name.name.type;
1408 tsk->conn_instance = dest->addr.name.name.instance;
1410 msg_set_syn(hdr, 1);
1413 seq = &dest->addr.nameseq;
1414 if (dest->addrtype == TIPC_ADDR_MCAST)
1415 return tipc_sendmcast(sock, seq, m, dlen, timeout);
1417 if (dest->addrtype == TIPC_ADDR_NAME) {
1418 type = dest->addr.name.name.type;
1419 inst = dest->addr.name.name.instance;
1420 dnode = dest->addr.name.domain;
1421 dport = tipc_nametbl_translate(net, type, inst, &dnode);
1422 if (unlikely(!dport && !dnode))
1423 return -EHOSTUNREACH;
1424 } else if (dest->addrtype == TIPC_ADDR_ID) {
1425 dnode = dest->addr.id.node;
1430 /* Block or return if destination link is congested */
1431 rc = tipc_wait_for_cond(sock, &timeout,
1432 !tipc_dest_find(clinks, dnode, 0));
1436 if (dest->addrtype == TIPC_ADDR_NAME) {
1437 msg_set_type(hdr, TIPC_NAMED_MSG);
1438 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1439 msg_set_nametype(hdr, type);
1440 msg_set_nameinst(hdr, inst);
1441 msg_set_lookup_scope(hdr, tipc_node2scope(dnode));
1442 msg_set_destnode(hdr, dnode);
1443 msg_set_destport(hdr, dport);
1444 } else { /* TIPC_ADDR_ID */
1445 msg_set_type(hdr, TIPC_DIRECT_MSG);
1446 msg_set_lookup_scope(hdr, 0);
1447 msg_set_destnode(hdr, dnode);
1448 msg_set_destport(hdr, dest->addr.id.ref);
1449 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1452 __skb_queue_head_init(&pkts);
1453 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
1454 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1455 if (unlikely(rc != dlen))
1457 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1458 __skb_queue_purge(&pkts);
1462 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1463 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
1464 if (unlikely(rc == -ELINKCONG)) {
1465 tipc_dest_push(clinks, dnode, 0);
1466 tsk->cong_link_cnt++;
1470 if (unlikely(syn && !rc))
1471 tipc_set_sk_state(sk, TIPC_CONNECTING);
1473 return rc ? rc : dlen;
1477 * tipc_sendstream - send stream-oriented data
1478 * @sock: socket structure
1480 * @dsz: total length of data to be transmitted
1482 * Used for SOCK_STREAM data.
1484 * Returns the number of bytes sent on success (or partial success),
1485 * or errno if no data sent
1487 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1489 struct sock *sk = sock->sk;
1493 ret = __tipc_sendstream(sock, m, dsz);
1499 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1501 struct sock *sk = sock->sk;
1502 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1503 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1504 struct sk_buff_head *txq = &sk->sk_write_queue;
1505 struct tipc_sock *tsk = tipc_sk(sk);
1506 struct tipc_msg *hdr = &tsk->phdr;
1507 struct net *net = sock_net(sk);
1508 u32 dnode = tsk_peer_node(tsk);
1509 int maxnagle = tsk->maxnagle;
1510 int maxpkt = tsk->max_pkt;
1514 if (unlikely(dlen > INT_MAX))
1517 /* Handle implicit connection setup */
1518 if (unlikely(dest)) {
1519 rc = __tipc_sendmsg(sock, m, dlen);
1520 if (dlen && dlen == rc) {
1521 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1522 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1528 rc = tipc_wait_for_cond(sock, &timeout,
1529 (!tsk->cong_link_cnt &&
1530 !tsk_conn_cong(tsk) &&
1531 tipc_sk_connected(sk)));
1534 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1535 blocks = tsk->snd_backlog;
1536 if (tsk->oneway++ >= 4 && send <= maxnagle) {
1537 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1538 if (unlikely(rc < 0))
1541 if (blocks <= 64 && tsk->expect_ack) {
1542 tsk->snd_backlog = blocks;
1546 tsk->expect_ack = true;
1548 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1549 if (unlikely(rc != send))
1551 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1553 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1554 TIPC_DUMP_SK_SNDQ, " ");
1555 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1556 if (unlikely(rc == -ELINKCONG)) {
1557 tsk->cong_link_cnt = 1;
1561 tsk->snt_unacked += blocks;
1562 tsk->snd_backlog = 0;
1565 } while (sent < dlen && !rc);
1567 return sent ? sent : rc;
1571 * tipc_send_packet - send a connection-oriented message
1572 * @sock: socket structure
1573 * @m: message to send
1574 * @dsz: length of data to be transmitted
1576 * Used for SOCK_SEQPACKET messages.
1578 * Returns the number of bytes sent on success, or errno otherwise
1580 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1582 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1585 return tipc_sendstream(sock, m, dsz);
1588 /* tipc_sk_finish_conn - complete the setup of a connection
1590 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1593 struct sock *sk = &tsk->sk;
1594 struct net *net = sock_net(sk);
1595 struct tipc_msg *msg = &tsk->phdr;
1597 msg_set_syn(msg, 0);
1598 msg_set_destnode(msg, peer_node);
1599 msg_set_destport(msg, peer_port);
1600 msg_set_type(msg, TIPC_CONN_MSG);
1601 msg_set_lookup_scope(msg, 0);
1602 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1604 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1605 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1606 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1607 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1608 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1610 __skb_queue_purge(&sk->sk_write_queue);
1611 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1614 /* Fall back to message based flow control */
1615 tsk->rcv_win = FLOWCTL_MSG_WIN;
1616 tsk->snd_win = FLOWCTL_MSG_WIN;
1620 * tipc_sk_set_orig_addr - capture sender's address for received message
1621 * @m: descriptor for message info
1622 * @hdr: received message header
1624 * Note: Address is not captured if not requested by receiver.
1626 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1628 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1629 struct tipc_msg *hdr = buf_msg(skb);
1634 srcaddr->sock.family = AF_TIPC;
1635 srcaddr->sock.addrtype = TIPC_ADDR_ID;
1636 srcaddr->sock.scope = 0;
1637 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1638 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1639 srcaddr->sock.addr.name.domain = 0;
1640 m->msg_namelen = sizeof(struct sockaddr_tipc);
1642 if (!msg_in_group(hdr))
1645 /* Group message users may also want to know sending member's id */
1646 srcaddr->member.family = AF_TIPC;
1647 srcaddr->member.addrtype = TIPC_ADDR_NAME;
1648 srcaddr->member.scope = 0;
1649 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1650 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1651 srcaddr->member.addr.name.domain = 0;
1652 m->msg_namelen = sizeof(*srcaddr);
1656 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1657 * @m: descriptor for message info
1658 * @skb: received message buffer
1659 * @tsk: TIPC port associated with message
1661 * Note: Ancillary data is not captured if not requested by receiver.
1663 * Returns 0 if successful, otherwise errno
1665 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1666 struct tipc_sock *tsk)
1668 struct tipc_msg *msg;
1675 if (likely(m->msg_controllen == 0))
1679 /* Optionally capture errored message object(s) */
1680 err = msg ? msg_errcode(msg) : 0;
1681 if (unlikely(err)) {
1683 anc_data[1] = msg_data_sz(msg);
1684 res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
1688 if (skb_linearize(skb))
1691 res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
1698 /* Optionally capture message destination object */
1699 dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
1700 switch (dest_type) {
1701 case TIPC_NAMED_MSG:
1703 anc_data[0] = msg_nametype(msg);
1704 anc_data[1] = msg_namelower(msg);
1705 anc_data[2] = msg_namelower(msg);
1707 case TIPC_MCAST_MSG:
1709 anc_data[0] = msg_nametype(msg);
1710 anc_data[1] = msg_namelower(msg);
1711 anc_data[2] = msg_nameupper(msg);
1714 has_name = (tsk->conn_type != 0);
1715 anc_data[0] = tsk->conn_type;
1716 anc_data[1] = tsk->conn_instance;
1717 anc_data[2] = tsk->conn_instance;
1723 res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
1731 static void tipc_sk_send_ack(struct tipc_sock *tsk)
1733 struct sock *sk = &tsk->sk;
1734 struct net *net = sock_net(sk);
1735 struct sk_buff *skb = NULL;
1736 struct tipc_msg *msg;
1737 u32 peer_port = tsk_peer_port(tsk);
1738 u32 dnode = tsk_peer_node(tsk);
1740 if (!tipc_sk_connected(sk))
1742 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1743 dnode, tsk_own_node(tsk), peer_port,
1744 tsk->portid, TIPC_OK);
1748 msg_set_conn_ack(msg, tsk->rcv_unacked);
1749 tsk->rcv_unacked = 0;
1751 /* Adjust to and advertize the correct window limit */
1752 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1753 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1754 msg_set_adv_win(msg, tsk->rcv_win);
1756 tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
1759 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1761 struct sock *sk = sock->sk;
1762 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1763 long timeo = *timeop;
1764 int err = sock_error(sk);
1770 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1771 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1775 add_wait_queue(sk_sleep(sk), &wait);
1777 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1778 sched_annotate_sleep();
1780 remove_wait_queue(sk_sleep(sk), &wait);
1783 if (!skb_queue_empty(&sk->sk_receive_queue))
1788 err = sock_intr_errno(timeo);
1789 if (signal_pending(current))
1792 err = sock_error(sk);
1801 * tipc_recvmsg - receive packet-oriented message
1802 * @m: descriptor for message info
1803 * @buflen: length of user buffer area
1804 * @flags: receive flags
1806 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1807 * If the complete message doesn't fit in user area, truncate it.
1809 * Returns size of returned message data, errno otherwise
1811 static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1812 size_t buflen, int flags)
1814 struct sock *sk = sock->sk;
1815 bool connected = !tipc_sk_type_connectionless(sk);
1816 struct tipc_sock *tsk = tipc_sk(sk);
1817 int rc, err, hlen, dlen, copy;
1818 struct sk_buff_head xmitq;
1819 struct tipc_msg *hdr;
1820 struct sk_buff *skb;
1824 /* Catch invalid receive requests */
1825 if (unlikely(!buflen))
1829 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1833 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1835 /* Step rcv queue to first msg with data or error; wait if necessary */
1837 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1840 skb = skb_peek(&sk->sk_receive_queue);
1842 dlen = msg_data_sz(hdr);
1843 hlen = msg_hdr_sz(hdr);
1844 err = msg_errcode(hdr);
1845 grp_evt = msg_is_grp_evt(hdr);
1846 if (likely(dlen || err))
1848 tsk_advance_rx_queue(sk);
1851 /* Collect msg meta data, including error code and rejected data */
1852 tipc_sk_set_orig_addr(m, skb);
1853 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1858 /* Capture data if non-error msg, otherwise just set return value */
1860 copy = min_t(int, dlen, buflen);
1861 if (unlikely(copy != dlen))
1862 m->msg_flags |= MSG_TRUNC;
1863 rc = skb_copy_datagram_msg(skb, hlen, m, copy);
1867 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
1873 /* Mark message as group event if applicable */
1874 if (unlikely(grp_evt)) {
1875 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1876 m->msg_flags |= MSG_EOR;
1877 m->msg_flags |= MSG_OOB;
1881 /* Caption of data or error code/rejected data was successful */
1882 if (unlikely(flags & MSG_PEEK))
1885 /* Send group flow control advertisement when applicable */
1886 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1887 __skb_queue_head_init(&xmitq);
1888 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1889 msg_orignode(hdr), msg_origport(hdr),
1891 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1894 tsk_advance_rx_queue(sk);
1896 if (likely(!connected))
1899 /* Send connection flow control advertisement when applicable */
1900 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1901 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1902 tipc_sk_send_ack(tsk);
1905 return rc ? rc : copy;
1909 * tipc_recvstream - receive stream-oriented data
1910 * @m: descriptor for message info
1911 * @buflen: total size of user buffer area
1912 * @flags: receive flags
1914 * Used for SOCK_STREAM messages only. If not enough data is available
1915 * will optionally wait for more; never truncates data.
1917 * Returns size of returned message data, errno otherwise
1919 static int tipc_recvstream(struct socket *sock, struct msghdr *m,
1920 size_t buflen, int flags)
1922 struct sock *sk = sock->sk;
1923 struct tipc_sock *tsk = tipc_sk(sk);
1924 struct sk_buff *skb;
1925 struct tipc_msg *hdr;
1926 struct tipc_skb_cb *skb_cb;
1927 bool peek = flags & MSG_PEEK;
1928 int offset, required, copy, copied = 0;
1929 int hlen, dlen, err, rc;
1933 /* Catch invalid receive attempts */
1934 if (unlikely(!buflen))
1939 if (unlikely(sk->sk_state == TIPC_OPEN)) {
1943 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
1944 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1947 /* Look at first msg in receive queue; wait if necessary */
1948 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1951 skb = skb_peek(&sk->sk_receive_queue);
1952 skb_cb = TIPC_SKB_CB(skb);
1954 dlen = msg_data_sz(hdr);
1955 hlen = msg_hdr_sz(hdr);
1956 err = msg_errcode(hdr);
1958 /* Discard any empty non-errored (SYN-) message */
1959 if (unlikely(!dlen && !err)) {
1960 tsk_advance_rx_queue(sk);
1964 /* Collect msg meta data, incl. error code and rejected data */
1966 tipc_sk_set_orig_addr(m, skb);
1967 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1973 /* Copy data if msg ok, otherwise return error/partial data */
1975 ack = msg_ack_required(hdr);
1976 offset = skb_cb->bytes_read;
1977 copy = min_t(int, dlen - offset, buflen - copied);
1978 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
1983 if (unlikely(offset < dlen)) {
1985 skb_cb->bytes_read = offset;
1990 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
1999 tsk_advance_rx_queue(sk);
2001 /* Send connection flow control advertisement when applicable */
2002 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2003 if (ack || tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2004 tipc_sk_send_ack(tsk);
2006 /* Exit if all requested data or FIN/error received */
2007 if (copied == buflen || err)
2010 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2013 return copied ? copied : rc;
2017 * tipc_write_space - wake up thread if port congestion is released
2020 static void tipc_write_space(struct sock *sk)
2022 struct socket_wq *wq;
2025 wq = rcu_dereference(sk->sk_wq);
2026 if (skwq_has_sleeper(wq))
2027 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2028 EPOLLWRNORM | EPOLLWRBAND);
2033 * tipc_data_ready - wake up threads to indicate messages have been received
2035 * @len: the length of messages
2037 static void tipc_data_ready(struct sock *sk)
2039 struct socket_wq *wq;
2042 wq = rcu_dereference(sk->sk_wq);
2043 if (skwq_has_sleeper(wq))
2044 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2045 EPOLLRDNORM | EPOLLRDBAND);
2049 static void tipc_sock_destruct(struct sock *sk)
2051 __skb_queue_purge(&sk->sk_receive_queue);
2054 static void tipc_sk_proto_rcv(struct sock *sk,
2055 struct sk_buff_head *inputq,
2056 struct sk_buff_head *xmitq)
2058 struct sk_buff *skb = __skb_dequeue(inputq);
2059 struct tipc_sock *tsk = tipc_sk(sk);
2060 struct tipc_msg *hdr = buf_msg(skb);
2061 struct tipc_group *grp = tsk->group;
2062 bool wakeup = false;
2064 switch (msg_user(hdr)) {
2066 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2069 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2070 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2072 tsk->cong_link_cnt--;
2074 tipc_sk_push_backlog(tsk);
2076 case GROUP_PROTOCOL:
2077 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2080 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2081 hdr, inputq, xmitq);
2088 sk->sk_write_space(sk);
2094 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2096 * @skb: pointer to message buffer.
2097 * Returns true if message should be added to receive queue, false otherwise
2099 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
2101 struct sock *sk = &tsk->sk;
2102 struct net *net = sock_net(sk);
2103 struct tipc_msg *hdr = buf_msg(skb);
2104 bool con_msg = msg_connected(hdr);
2105 u32 pport = tsk_peer_port(tsk);
2106 u32 pnode = tsk_peer_node(tsk);
2107 u32 oport = msg_origport(hdr);
2108 u32 onode = msg_orignode(hdr);
2109 int err = msg_errcode(hdr);
2110 unsigned long delay;
2112 if (unlikely(msg_mcast(hdr)))
2116 switch (sk->sk_state) {
2117 case TIPC_CONNECTING:
2119 if (likely(con_msg)) {
2122 tipc_sk_finish_conn(tsk, oport, onode);
2123 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2124 /* ACK+ message with data is added to receive queue */
2125 if (msg_data_sz(hdr))
2127 /* Empty ACK-, - wake up sleeping connect() and drop */
2128 sk->sk_state_change(sk);
2129 msg_set_dest_droppable(hdr, 1);
2132 /* Ignore connectionless message if not from listening socket */
2133 if (oport != pport || onode != pnode)
2137 if (err != TIPC_ERR_OVERLOAD)
2140 /* Prepare for new setup attempt if we have a SYN clone */
2141 if (skb_queue_empty(&sk->sk_write_queue))
2143 get_random_bytes(&delay, 2);
2144 delay %= (tsk->conn_timeout / 4);
2145 delay = msecs_to_jiffies(delay + 100);
2146 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2149 case TIPC_DISCONNECTING:
2152 /* Accept only SYN message */
2153 if (!msg_is_syn(hdr) &&
2154 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2156 if (!con_msg && !err)
2159 case TIPC_ESTABLISHED:
2160 if (!skb_queue_empty(&sk->sk_write_queue))
2161 tipc_sk_push_backlog(tsk);
2162 /* Accept only connection-based messages sent by peer */
2163 if (likely(con_msg && !err && pport == oport && pnode == onode))
2165 if (!tsk_peer_msg(tsk, hdr))
2169 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2170 tipc_node_remove_conn(net, pnode, tsk->portid);
2171 sk->sk_state_change(sk);
2174 pr_err("Unknown sk_state %u\n", sk->sk_state);
2176 /* Abort connection setup attempt */
2177 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2178 sk->sk_err = ECONNREFUSED;
2179 sk->sk_state_change(sk);
2184 * rcvbuf_limit - get proper overload limit of socket receive queue
2188 * For connection oriented messages, irrespective of importance,
2189 * default queue limit is 2 MB.
2191 * For connectionless messages, queue limits are based on message
2192 * importance as follows:
2194 * TIPC_LOW_IMPORTANCE (2 MB)
2195 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2196 * TIPC_HIGH_IMPORTANCE (8 MB)
2197 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2199 * Returns overload limit according to corresponding message importance
2201 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2203 struct tipc_sock *tsk = tipc_sk(sk);
2204 struct tipc_msg *hdr = buf_msg(skb);
2206 if (unlikely(msg_in_group(hdr)))
2207 return READ_ONCE(sk->sk_rcvbuf);
2209 if (unlikely(!msg_connected(hdr)))
2210 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2212 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2213 return READ_ONCE(sk->sk_rcvbuf);
2215 return FLOWCTL_MSG_LIM;
2219 * tipc_sk_filter_rcv - validate incoming message
2221 * @skb: pointer to message.
2223 * Enqueues message on receive queue if acceptable; optionally handles
2224 * disconnect indication for a connected socket.
2226 * Called with socket lock already taken
2229 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2230 struct sk_buff_head *xmitq)
2232 bool sk_conn = !tipc_sk_type_connectionless(sk);
2233 struct tipc_sock *tsk = tipc_sk(sk);
2234 struct tipc_group *grp = tsk->group;
2235 struct tipc_msg *hdr = buf_msg(skb);
2236 struct net *net = sock_net(sk);
2237 struct sk_buff_head inputq;
2238 int mtyp = msg_type(hdr);
2239 int limit, err = TIPC_OK;
2241 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2242 TIPC_SKB_CB(skb)->bytes_read = 0;
2243 __skb_queue_head_init(&inputq);
2244 __skb_queue_tail(&inputq, skb);
2246 if (unlikely(!msg_isdata(hdr)))
2247 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2250 tipc_group_filter_msg(grp, &inputq, xmitq);
2252 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2253 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2255 /* Validate and add to receive buffer if there is space */
2256 while ((skb = __skb_dequeue(&inputq))) {
2258 limit = rcvbuf_limit(sk, skb);
2259 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) ||
2260 (!sk_conn && msg_connected(hdr)) ||
2261 (!grp && msg_in_group(hdr)))
2262 err = TIPC_ERR_NO_PORT;
2263 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2264 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2266 atomic_inc(&sk->sk_drops);
2267 err = TIPC_ERR_OVERLOAD;
2270 if (unlikely(err)) {
2271 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2272 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2274 __skb_queue_tail(xmitq, skb);
2279 __skb_queue_tail(&sk->sk_receive_queue, skb);
2280 skb_set_owner_r(skb, sk);
2281 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2282 "rcvq >90% allocated!");
2283 sk->sk_data_ready(sk);
2288 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2292 * Caller must hold socket lock
2294 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2296 unsigned int before = sk_rmem_alloc_get(sk);
2297 struct sk_buff_head xmitq;
2300 __skb_queue_head_init(&xmitq);
2302 tipc_sk_filter_rcv(sk, skb, &xmitq);
2303 added = sk_rmem_alloc_get(sk) - before;
2304 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2306 /* Send pending response/rejected messages, if any */
2307 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2312 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2313 * inputq and try adding them to socket or backlog queue
2314 * @inputq: list of incoming buffers with potentially different destinations
2315 * @sk: socket where the buffers should be enqueued
2316 * @dport: port number for the socket
2318 * Caller must hold socket lock
2320 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2321 u32 dport, struct sk_buff_head *xmitq)
2323 unsigned long time_limit = jiffies + 2;
2324 struct sk_buff *skb;
2329 while (skb_queue_len(inputq)) {
2330 if (unlikely(time_after_eq(jiffies, time_limit)))
2333 skb = tipc_skb_dequeue(inputq, dport);
2337 /* Add message directly to receive queue if possible */
2338 if (!sock_owned_by_user(sk)) {
2339 tipc_sk_filter_rcv(sk, skb, xmitq);
2343 /* Try backlog, compensating for double-counted bytes */
2344 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2345 if (!sk->sk_backlog.len)
2346 atomic_set(dcnt, 0);
2347 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2348 if (likely(!sk_add_backlog(sk, skb, lim))) {
2349 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2350 "bklg & rcvq >90% allocated!");
2354 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2355 /* Overload => reject message back to sender */
2356 onode = tipc_own_addr(sock_net(sk));
2357 atomic_inc(&sk->sk_drops);
2358 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2359 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2361 __skb_queue_tail(xmitq, skb);
2368 * tipc_sk_rcv - handle a chain of incoming buffers
2369 * @inputq: buffer list containing the buffers
2370 * Consumes all buffers in list until inputq is empty
2371 * Note: may be called in multiple threads referring to the same queue
2373 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2375 struct sk_buff_head xmitq;
2376 u32 dnode, dport = 0;
2378 struct tipc_sock *tsk;
2380 struct sk_buff *skb;
2382 __skb_queue_head_init(&xmitq);
2383 while (skb_queue_len(inputq)) {
2384 dport = tipc_skb_peek_port(inputq, dport);
2385 tsk = tipc_sk_lookup(net, dport);
2389 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2390 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2391 spin_unlock_bh(&sk->sk_lock.slock);
2393 /* Send pending response/rejected messages, if any */
2394 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2398 /* No destination socket => dequeue skb if still there */
2399 skb = tipc_skb_dequeue(inputq, dport);
2403 /* Try secondary lookup if unresolved named message */
2404 err = TIPC_ERR_NO_PORT;
2405 if (tipc_msg_lookup_dest(net, skb, &err))
2408 /* Prepare for message rejection */
2409 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2412 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2414 dnode = msg_destnode(buf_msg(skb));
2415 tipc_node_xmit_skb(net, skb, dnode, dport);
2419 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2421 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2422 struct sock *sk = sock->sk;
2426 int err = sock_error(sk);
2431 if (signal_pending(current))
2432 return sock_intr_errno(*timeo_p);
2434 add_wait_queue(sk_sleep(sk), &wait);
2435 done = sk_wait_event(sk, timeo_p,
2436 sk->sk_state != TIPC_CONNECTING, &wait);
2437 remove_wait_queue(sk_sleep(sk), &wait);
2442 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2444 if (addr->family != AF_TIPC)
2446 if (addr->addrtype == TIPC_SERVICE_RANGE)
2447 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2448 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2449 addr->addrtype == TIPC_SOCKET_ADDR);
2453 * tipc_connect - establish a connection to another TIPC port
2454 * @sock: socket structure
2455 * @dest: socket address for destination port
2456 * @destlen: size of socket address data structure
2457 * @flags: file-related flags associated with socket
2459 * Returns 0 on success, errno otherwise
2461 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2462 int destlen, int flags)
2464 struct sock *sk = sock->sk;
2465 struct tipc_sock *tsk = tipc_sk(sk);
2466 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2467 struct msghdr m = {NULL,};
2468 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2472 if (destlen != sizeof(struct sockaddr_tipc))
2482 if (dst->family == AF_UNSPEC) {
2483 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2484 if (!tipc_sk_type_connectionless(sk))
2488 if (!tipc_sockaddr_is_sane(dst)) {
2492 /* DGRAM/RDM connect(), just save the destaddr */
2493 if (tipc_sk_type_connectionless(sk)) {
2494 memcpy(&tsk->peer, dest, destlen);
2496 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2501 previous = sk->sk_state;
2503 switch (sk->sk_state) {
2505 /* Send a 'SYN-' to destination */
2507 m.msg_namelen = destlen;
2509 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2510 * indicate send_msg() is never blocked.
2513 m.msg_flags = MSG_DONTWAIT;
2515 res = __tipc_sendmsg(sock, &m, 0);
2516 if ((res < 0) && (res != -EWOULDBLOCK))
2519 /* Just entered TIPC_CONNECTING state; the only
2520 * difference is that return value in non-blocking
2521 * case is EINPROGRESS, rather than EALREADY.
2525 case TIPC_CONNECTING:
2527 if (previous == TIPC_CONNECTING)
2531 timeout = msecs_to_jiffies(timeout);
2532 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2533 res = tipc_wait_for_connect(sock, &timeout);
2535 case TIPC_ESTABLISHED:
2548 * tipc_listen - allow socket to listen for incoming connections
2549 * @sock: socket structure
2552 * Returns 0 on success, errno otherwise
2554 static int tipc_listen(struct socket *sock, int len)
2556 struct sock *sk = sock->sk;
2560 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2566 static int tipc_wait_for_accept(struct socket *sock, long timeo)
2568 struct sock *sk = sock->sk;
2572 /* True wake-one mechanism for incoming connections: only
2573 * one process gets woken up, not the 'whole herd'.
2574 * Since we do not 'race & poll' for established sockets
2575 * anymore, the common case will execute the loop only once.
2578 prepare_to_wait_exclusive(sk_sleep(sk), &wait,
2579 TASK_INTERRUPTIBLE);
2580 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2582 timeo = schedule_timeout(timeo);
2586 if (!skb_queue_empty(&sk->sk_receive_queue))
2591 err = sock_intr_errno(timeo);
2592 if (signal_pending(current))
2595 finish_wait(sk_sleep(sk), &wait);
2600 * tipc_accept - wait for connection request
2601 * @sock: listening socket
2602 * @newsock: new socket that is to be connected
2603 * @flags: file-related flags associated with socket
2605 * Returns 0 on success, errno otherwise
2607 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2610 struct sock *new_sk, *sk = sock->sk;
2611 struct sk_buff *buf;
2612 struct tipc_sock *new_tsock;
2613 struct tipc_msg *msg;
2619 if (sk->sk_state != TIPC_LISTEN) {
2623 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2624 res = tipc_wait_for_accept(sock, timeo);
2628 buf = skb_peek(&sk->sk_receive_queue);
2630 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2633 security_sk_clone(sock->sk, new_sock->sk);
2635 new_sk = new_sock->sk;
2636 new_tsock = tipc_sk(new_sk);
2639 /* we lock on new_sk; but lockdep sees the lock on sk */
2640 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2643 * Reject any stray messages received by new socket
2644 * before the socket lock was taken (very, very unlikely)
2646 tsk_rej_rx_queue(new_sk);
2648 /* Connect new socket to it's peer */
2649 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2651 tsk_set_importance(new_tsock, msg_importance(msg));
2652 if (msg_named(msg)) {
2653 new_tsock->conn_type = msg_nametype(msg);
2654 new_tsock->conn_instance = msg_nameinst(msg);
2658 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
2659 * Respond to 'SYN+' by queuing it on new socket.
2661 if (!msg_data_sz(msg)) {
2662 struct msghdr m = {NULL,};
2664 tsk_advance_rx_queue(sk);
2665 __tipc_sendstream(new_sock, &m, 0);
2667 __skb_dequeue(&sk->sk_receive_queue);
2668 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2669 skb_set_owner_r(buf, new_sk);
2671 release_sock(new_sk);
2678 * tipc_shutdown - shutdown socket connection
2679 * @sock: socket structure
2680 * @how: direction to close (must be SHUT_RDWR)
2682 * Terminates connection (if necessary), then purges socket's receive queue.
2684 * Returns 0 on success, errno otherwise
2686 static int tipc_shutdown(struct socket *sock, int how)
2688 struct sock *sk = sock->sk;
2691 if (how != SHUT_RDWR)
2696 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2697 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2698 sk->sk_shutdown = SEND_SHUTDOWN;
2700 if (sk->sk_state == TIPC_DISCONNECTING) {
2701 /* Discard any unreceived messages */
2702 __skb_queue_purge(&sk->sk_receive_queue);
2704 /* Wake up anyone sleeping in poll */
2705 sk->sk_state_change(sk);
2715 static void tipc_sk_check_probing_state(struct sock *sk,
2716 struct sk_buff_head *list)
2718 struct tipc_sock *tsk = tipc_sk(sk);
2719 u32 pnode = tsk_peer_node(tsk);
2720 u32 pport = tsk_peer_port(tsk);
2721 u32 self = tsk_own_node(tsk);
2722 u32 oport = tsk->portid;
2723 struct sk_buff *skb;
2725 if (tsk->probe_unacked) {
2726 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2727 sk->sk_err = ECONNABORTED;
2728 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2729 sk->sk_state_change(sk);
2732 /* Prepare new probe */
2733 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2734 pnode, self, pport, oport, TIPC_OK);
2736 __skb_queue_tail(list, skb);
2737 tsk->probe_unacked = true;
2738 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2741 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2743 struct tipc_sock *tsk = tipc_sk(sk);
2745 /* Try again later if dest link is congested */
2746 if (tsk->cong_link_cnt) {
2747 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100));
2750 /* Prepare SYN for retransmit */
2751 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2754 static void tipc_sk_timeout(struct timer_list *t)
2756 struct sock *sk = from_timer(sk, t, sk_timer);
2757 struct tipc_sock *tsk = tipc_sk(sk);
2758 u32 pnode = tsk_peer_node(tsk);
2759 struct sk_buff_head list;
2762 __skb_queue_head_init(&list);
2765 /* Try again later if socket is busy */
2766 if (sock_owned_by_user(sk)) {
2767 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2773 if (sk->sk_state == TIPC_ESTABLISHED)
2774 tipc_sk_check_probing_state(sk, &list);
2775 else if (sk->sk_state == TIPC_CONNECTING)
2776 tipc_sk_retry_connect(sk, &list);
2780 if (!skb_queue_empty(&list))
2781 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2783 /* SYN messages may cause link congestion */
2784 if (rc == -ELINKCONG) {
2785 tipc_dest_push(&tsk->cong_links, pnode, 0);
2786 tsk->cong_link_cnt = 1;
2791 static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
2792 struct tipc_name_seq const *seq)
2794 struct sock *sk = &tsk->sk;
2795 struct net *net = sock_net(sk);
2796 struct publication *publ;
2799 if (scope != TIPC_NODE_SCOPE)
2800 scope = TIPC_CLUSTER_SCOPE;
2802 if (tipc_sk_connected(sk))
2804 key = tsk->portid + tsk->pub_count + 1;
2805 if (key == tsk->portid)
2808 publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
2809 scope, tsk->portid, key);
2810 if (unlikely(!publ))
2813 list_add(&publ->binding_sock, &tsk->publications);
2819 static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
2820 struct tipc_name_seq const *seq)
2822 struct net *net = sock_net(&tsk->sk);
2823 struct publication *publ;
2824 struct publication *safe;
2827 if (scope != TIPC_NODE_SCOPE)
2828 scope = TIPC_CLUSTER_SCOPE;
2830 list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) {
2832 if (publ->scope != scope)
2834 if (publ->type != seq->type)
2836 if (publ->lower != seq->lower)
2838 if (publ->upper != seq->upper)
2840 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2841 publ->upper, publ->key);
2845 tipc_nametbl_withdraw(net, publ->type, publ->lower,
2846 publ->upper, publ->key);
2849 if (list_empty(&tsk->publications))
2854 /* tipc_sk_reinit: set non-zero address in all existing sockets
2855 * when we go from standalone to network mode.
2857 void tipc_sk_reinit(struct net *net)
2859 struct tipc_net *tn = net_generic(net, tipc_net_id);
2860 struct rhashtable_iter iter;
2861 struct tipc_sock *tsk;
2862 struct tipc_msg *msg;
2864 rhashtable_walk_enter(&tn->sk_rht, &iter);
2867 rhashtable_walk_start(&iter);
2869 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2870 sock_hold(&tsk->sk);
2871 rhashtable_walk_stop(&iter);
2872 lock_sock(&tsk->sk);
2874 msg_set_prevnode(msg, tipc_own_addr(net));
2875 msg_set_orignode(msg, tipc_own_addr(net));
2876 release_sock(&tsk->sk);
2877 rhashtable_walk_start(&iter);
2881 rhashtable_walk_stop(&iter);
2882 } while (tsk == ERR_PTR(-EAGAIN));
2884 rhashtable_walk_exit(&iter);
2887 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2889 struct tipc_net *tn = net_generic(net, tipc_net_id);
2890 struct tipc_sock *tsk;
2893 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
2895 sock_hold(&tsk->sk);
2901 static int tipc_sk_insert(struct tipc_sock *tsk)
2903 struct sock *sk = &tsk->sk;
2904 struct net *net = sock_net(sk);
2905 struct tipc_net *tn = net_generic(net, tipc_net_id);
2906 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2907 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2909 while (remaining--) {
2911 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2912 portid = TIPC_MIN_PORT;
2913 tsk->portid = portid;
2914 sock_hold(&tsk->sk);
2915 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
2924 static void tipc_sk_remove(struct tipc_sock *tsk)
2926 struct sock *sk = &tsk->sk;
2927 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
2929 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
2930 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
2935 static const struct rhashtable_params tsk_rht_params = {
2937 .head_offset = offsetof(struct tipc_sock, node),
2938 .key_offset = offsetof(struct tipc_sock, portid),
2939 .key_len = sizeof(u32), /* portid */
2940 .max_size = 1048576,
2942 .automatic_shrinking = true,
2945 int tipc_sk_rht_init(struct net *net)
2947 struct tipc_net *tn = net_generic(net, tipc_net_id);
2949 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
2952 void tipc_sk_rht_destroy(struct net *net)
2954 struct tipc_net *tn = net_generic(net, tipc_net_id);
2956 /* Wait for socket readers to complete */
2959 rhashtable_destroy(&tn->sk_rht);
2962 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
2964 struct net *net = sock_net(&tsk->sk);
2965 struct tipc_group *grp = tsk->group;
2966 struct tipc_msg *hdr = &tsk->phdr;
2967 struct tipc_name_seq seq;
2970 if (mreq->type < TIPC_RESERVED_TYPES)
2972 if (mreq->scope > TIPC_NODE_SCOPE)
2976 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
2980 msg_set_lookup_scope(hdr, mreq->scope);
2981 msg_set_nametype(hdr, mreq->type);
2982 msg_set_dest_droppable(hdr, true);
2983 seq.type = mreq->type;
2984 seq.lower = mreq->instance;
2985 seq.upper = seq.lower;
2986 tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope);
2987 rc = tipc_sk_publish(tsk, mreq->scope, &seq);
2989 tipc_group_delete(net, grp);
2993 /* Eliminate any risk that a broadcast overtakes sent JOINs */
2994 tsk->mc_method.rcast = true;
2995 tsk->mc_method.mandatory = true;
2996 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3000 static int tipc_sk_leave(struct tipc_sock *tsk)
3002 struct net *net = sock_net(&tsk->sk);
3003 struct tipc_group *grp = tsk->group;
3004 struct tipc_name_seq seq;
3009 tipc_group_self(grp, &seq, &scope);
3010 tipc_group_delete(net, grp);
3012 tipc_sk_withdraw(tsk, scope, &seq);
3017 * tipc_setsockopt - set socket option
3018 * @sock: socket structure
3019 * @lvl: option level
3020 * @opt: option identifier
3021 * @ov: pointer to new option value
3022 * @ol: length of option value
3024 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3025 * (to ease compatibility).
3027 * Returns 0 on success, errno otherwise
3029 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3030 char __user *ov, unsigned int ol)
3032 struct sock *sk = sock->sk;
3033 struct tipc_sock *tsk = tipc_sk(sk);
3034 struct tipc_group_req mreq;
3038 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3040 if (lvl != SOL_TIPC)
3041 return -ENOPROTOOPT;
3044 case TIPC_IMPORTANCE:
3045 case TIPC_SRC_DROPPABLE:
3046 case TIPC_DEST_DROPPABLE:
3047 case TIPC_CONN_TIMEOUT:
3049 if (ol < sizeof(value))
3051 if (get_user(value, (u32 __user *)ov))
3054 case TIPC_GROUP_JOIN:
3055 if (ol < sizeof(mreq))
3057 if (copy_from_user(&mreq, ov, sizeof(mreq)))
3068 case TIPC_IMPORTANCE:
3069 res = tsk_set_importance(tsk, value);
3071 case TIPC_SRC_DROPPABLE:
3072 if (sock->type != SOCK_STREAM)
3073 tsk_set_unreliable(tsk, value);
3077 case TIPC_DEST_DROPPABLE:
3078 tsk_set_unreturnable(tsk, value);
3080 case TIPC_CONN_TIMEOUT:
3081 tipc_sk(sk)->conn_timeout = value;
3083 case TIPC_MCAST_BROADCAST:
3084 tsk->mc_method.rcast = false;
3085 tsk->mc_method.mandatory = true;
3087 case TIPC_MCAST_REPLICAST:
3088 tsk->mc_method.rcast = true;
3089 tsk->mc_method.mandatory = true;
3091 case TIPC_GROUP_JOIN:
3092 res = tipc_sk_join(tsk, &mreq);
3094 case TIPC_GROUP_LEAVE:
3095 res = tipc_sk_leave(tsk);
3098 tsk->nodelay = !!value;
3111 * tipc_getsockopt - get socket option
3112 * @sock: socket structure
3113 * @lvl: option level
3114 * @opt: option identifier
3115 * @ov: receptacle for option value
3116 * @ol: receptacle for length of option value
3118 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3119 * (to ease compatibility).
3121 * Returns 0 on success, errno otherwise
3123 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3124 char __user *ov, int __user *ol)
3126 struct sock *sk = sock->sk;
3127 struct tipc_sock *tsk = tipc_sk(sk);
3128 struct tipc_name_seq seq;
3133 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3134 return put_user(0, ol);
3135 if (lvl != SOL_TIPC)
3136 return -ENOPROTOOPT;
3137 res = get_user(len, ol);
3144 case TIPC_IMPORTANCE:
3145 value = tsk_importance(tsk);
3147 case TIPC_SRC_DROPPABLE:
3148 value = tsk_unreliable(tsk);
3150 case TIPC_DEST_DROPPABLE:
3151 value = tsk_unreturnable(tsk);
3153 case TIPC_CONN_TIMEOUT:
3154 value = tsk->conn_timeout;
3155 /* no need to set "res", since already 0 at this point */
3157 case TIPC_NODE_RECVQ_DEPTH:
3158 value = 0; /* was tipc_queue_size, now obsolete */
3160 case TIPC_SOCK_RECVQ_DEPTH:
3161 value = skb_queue_len(&sk->sk_receive_queue);
3163 case TIPC_SOCK_RECVQ_USED:
3164 value = sk_rmem_alloc_get(sk);
3166 case TIPC_GROUP_JOIN:
3169 tipc_group_self(tsk->group, &seq, &scope);
3179 return res; /* "get" failed */
3181 if (len < sizeof(value))
3184 if (copy_to_user(ov, &value, sizeof(value)))
3187 return put_user(sizeof(value), ol);
3190 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3192 struct net *net = sock_net(sock->sk);
3193 struct tipc_sioc_nodeid_req nr = {0};
3194 struct tipc_sioc_ln_req lnr;
3195 void __user *argp = (void __user *)arg;
3198 case SIOCGETLINKNAME:
3199 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3201 if (!tipc_node_get_linkname(net,
3202 lnr.bearer_id & 0xffff, lnr.peer,
3203 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3204 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3208 return -EADDRNOTAVAIL;
3210 if (copy_from_user(&nr, argp, sizeof(nr)))
3212 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3213 return -EADDRNOTAVAIL;
3214 if (copy_to_user(argp, &nr, sizeof(nr)))
3218 return -ENOIOCTLCMD;
3222 static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3224 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3225 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3226 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3228 tsk1->peer.family = AF_TIPC;
3229 tsk1->peer.addrtype = TIPC_ADDR_ID;
3230 tsk1->peer.scope = TIPC_NODE_SCOPE;
3231 tsk1->peer.addr.id.ref = tsk2->portid;
3232 tsk1->peer.addr.id.node = onode;
3233 tsk2->peer.family = AF_TIPC;
3234 tsk2->peer.addrtype = TIPC_ADDR_ID;
3235 tsk2->peer.scope = TIPC_NODE_SCOPE;
3236 tsk2->peer.addr.id.ref = tsk1->portid;
3237 tsk2->peer.addr.id.node = onode;
3239 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3240 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3244 /* Protocol switches for the various types of TIPC sockets */
3246 static const struct proto_ops msg_ops = {
3247 .owner = THIS_MODULE,
3249 .release = tipc_release,
3251 .connect = tipc_connect,
3252 .socketpair = tipc_socketpair,
3253 .accept = sock_no_accept,
3254 .getname = tipc_getname,
3256 .ioctl = tipc_ioctl,
3257 .listen = sock_no_listen,
3258 .shutdown = tipc_shutdown,
3259 .setsockopt = tipc_setsockopt,
3260 .getsockopt = tipc_getsockopt,
3261 .sendmsg = tipc_sendmsg,
3262 .recvmsg = tipc_recvmsg,
3263 .mmap = sock_no_mmap,
3264 .sendpage = sock_no_sendpage
3267 static const struct proto_ops packet_ops = {
3268 .owner = THIS_MODULE,
3270 .release = tipc_release,
3272 .connect = tipc_connect,
3273 .socketpair = tipc_socketpair,
3274 .accept = tipc_accept,
3275 .getname = tipc_getname,
3277 .ioctl = tipc_ioctl,
3278 .listen = tipc_listen,
3279 .shutdown = tipc_shutdown,
3280 .setsockopt = tipc_setsockopt,
3281 .getsockopt = tipc_getsockopt,
3282 .sendmsg = tipc_send_packet,
3283 .recvmsg = tipc_recvmsg,
3284 .mmap = sock_no_mmap,
3285 .sendpage = sock_no_sendpage
3288 static const struct proto_ops stream_ops = {
3289 .owner = THIS_MODULE,
3291 .release = tipc_release,
3293 .connect = tipc_connect,
3294 .socketpair = tipc_socketpair,
3295 .accept = tipc_accept,
3296 .getname = tipc_getname,
3298 .ioctl = tipc_ioctl,
3299 .listen = tipc_listen,
3300 .shutdown = tipc_shutdown,
3301 .setsockopt = tipc_setsockopt,
3302 .getsockopt = tipc_getsockopt,
3303 .sendmsg = tipc_sendstream,
3304 .recvmsg = tipc_recvstream,
3305 .mmap = sock_no_mmap,
3306 .sendpage = sock_no_sendpage
3309 static const struct net_proto_family tipc_family_ops = {
3310 .owner = THIS_MODULE,
3312 .create = tipc_sk_create
3315 static struct proto tipc_proto = {
3317 .owner = THIS_MODULE,
3318 .obj_size = sizeof(struct tipc_sock),
3319 .sysctl_rmem = sysctl_tipc_rmem
3323 * tipc_socket_init - initialize TIPC socket interface
3325 * Returns 0 on success, errno otherwise
3327 int tipc_socket_init(void)
3331 res = proto_register(&tipc_proto, 1);
3333 pr_err("Failed to register TIPC protocol type\n");
3337 res = sock_register(&tipc_family_ops);
3339 pr_err("Failed to register TIPC socket type\n");
3340 proto_unregister(&tipc_proto);
3348 * tipc_socket_stop - stop TIPC socket interface
3350 void tipc_socket_stop(void)
3352 sock_unregister(tipc_family_ops.family);
3353 proto_unregister(&tipc_proto);
3356 /* Caller should hold socket lock for the passed tipc socket. */
3357 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3361 struct nlattr *nest;
3363 peer_node = tsk_peer_node(tsk);
3364 peer_port = tsk_peer_port(tsk);
3366 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3370 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3372 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3375 if (tsk->conn_type != 0) {
3376 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3378 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
3380 if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
3383 nla_nest_end(skb, nest);
3388 nla_nest_cancel(skb, nest);
3393 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3396 struct net *net = sock_net(skb->sk);
3397 struct sock *sk = &tsk->sk;
3399 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3400 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3403 if (tipc_sk_connected(sk)) {
3404 if (__tipc_nl_add_sk_con(skb, tsk))
3406 } else if (!list_empty(&tsk->publications)) {
3407 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3413 /* Caller should hold socket lock for the passed tipc socket. */
3414 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3415 struct tipc_sock *tsk)
3417 struct nlattr *attrs;
3420 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3421 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3425 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3427 goto genlmsg_cancel;
3429 if (__tipc_nl_add_sk_info(skb, tsk))
3430 goto attr_msg_cancel;
3432 nla_nest_end(skb, attrs);
3433 genlmsg_end(skb, hdr);
3438 nla_nest_cancel(skb, attrs);
3440 genlmsg_cancel(skb, hdr);
3445 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3446 int (*skb_handler)(struct sk_buff *skb,
3447 struct netlink_callback *cb,
3448 struct tipc_sock *tsk))
3450 struct rhashtable_iter *iter = (void *)cb->args[4];
3451 struct tipc_sock *tsk;
3454 rhashtable_walk_start(iter);
3455 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3458 if (err == -EAGAIN) {
3465 sock_hold(&tsk->sk);
3466 rhashtable_walk_stop(iter);
3467 lock_sock(&tsk->sk);
3468 err = skb_handler(skb, cb, tsk);
3470 release_sock(&tsk->sk);
3474 release_sock(&tsk->sk);
3475 rhashtable_walk_start(iter);
3478 rhashtable_walk_stop(iter);
3482 EXPORT_SYMBOL(tipc_nl_sk_walk);
3484 int tipc_dump_start(struct netlink_callback *cb)
3486 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3488 EXPORT_SYMBOL(tipc_dump_start);
3490 int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3492 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3493 struct rhashtable_iter *iter = (void *)cb->args[4];
3494 struct tipc_net *tn = tipc_net(net);
3497 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3501 cb->args[4] = (long)iter;
3504 rhashtable_walk_enter(&tn->sk_rht, iter);
3508 int tipc_dump_done(struct netlink_callback *cb)
3510 struct rhashtable_iter *hti = (void *)cb->args[4];
3512 rhashtable_walk_exit(hti);
3516 EXPORT_SYMBOL(tipc_dump_done);
3518 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3519 struct tipc_sock *tsk, u32 sk_filter_state,
3520 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3522 struct sock *sk = &tsk->sk;
3523 struct nlattr *attrs;
3524 struct nlattr *stat;
3526 /*filter response w.r.t sk_state*/
3527 if (!(sk_filter_state & (1 << sk->sk_state)))
3530 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3534 if (__tipc_nl_add_sk_info(skb, tsk))
3535 goto attr_msg_cancel;
3537 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3538 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3539 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3540 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3541 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3543 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3544 tipc_diag_gen_cookie(sk),
3546 goto attr_msg_cancel;
3548 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3550 goto attr_msg_cancel;
3552 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3553 skb_queue_len(&sk->sk_receive_queue)) ||
3554 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3555 skb_queue_len(&sk->sk_write_queue)) ||
3556 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3557 atomic_read(&sk->sk_drops)))
3558 goto stat_msg_cancel;
3560 if (tsk->cong_link_cnt &&
3561 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3562 goto stat_msg_cancel;
3564 if (tsk_conn_cong(tsk) &&
3565 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3566 goto stat_msg_cancel;
3568 nla_nest_end(skb, stat);
3571 if (tipc_group_fill_sock_diag(tsk->group, skb))
3572 goto stat_msg_cancel;
3574 nla_nest_end(skb, attrs);
3579 nla_nest_cancel(skb, stat);
3581 nla_nest_cancel(skb, attrs);
3585 EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3587 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3589 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3592 /* Caller should hold socket lock for the passed tipc socket. */
3593 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3594 struct netlink_callback *cb,
3595 struct publication *publ)
3598 struct nlattr *attrs;
3600 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3601 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3605 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3607 goto genlmsg_cancel;
3609 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3610 goto attr_msg_cancel;
3611 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
3612 goto attr_msg_cancel;
3613 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
3614 goto attr_msg_cancel;
3615 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
3616 goto attr_msg_cancel;
3618 nla_nest_end(skb, attrs);
3619 genlmsg_end(skb, hdr);
3624 nla_nest_cancel(skb, attrs);
3626 genlmsg_cancel(skb, hdr);
3631 /* Caller should hold socket lock for the passed tipc socket. */
3632 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3633 struct netlink_callback *cb,
3634 struct tipc_sock *tsk, u32 *last_publ)
3637 struct publication *p;
3640 list_for_each_entry(p, &tsk->publications, binding_sock) {
3641 if (p->key == *last_publ)
3644 if (p->key != *last_publ) {
3645 /* We never set seq or call nl_dump_check_consistent()
3646 * this means that setting prev_seq here will cause the
3647 * consistence check to fail in the netlink callback
3648 * handler. Resulting in the last NLMSG_DONE message
3649 * having the NLM_F_DUMP_INTR flag set.
3656 p = list_first_entry(&tsk->publications, struct publication,
3660 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3661 err = __tipc_nl_add_sk_publ(skb, cb, p);
3663 *last_publ = p->key;
3672 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3675 u32 tsk_portid = cb->args[0];
3676 u32 last_publ = cb->args[1];
3677 u32 done = cb->args[2];
3678 struct net *net = sock_net(skb->sk);
3679 struct tipc_sock *tsk;
3682 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
3683 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3685 if (!attrs[TIPC_NLA_SOCK])
3688 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3689 attrs[TIPC_NLA_SOCK],
3690 tipc_nl_sock_policy, NULL);
3694 if (!sock[TIPC_NLA_SOCK_REF])
3697 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3703 tsk = tipc_sk_lookup(net, tsk_portid);
3707 lock_sock(&tsk->sk);
3708 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3711 release_sock(&tsk->sk);
3714 cb->args[0] = tsk_portid;
3715 cb->args[1] = last_publ;
3722 * tipc_sk_filtering - check if a socket should be traced
3723 * @sk: the socket to be examined
3724 * @sysctl_tipc_sk_filter[]: the socket tuple for filtering,
3725 * (portid, sock type, name type, name lower, name upper)
3727 * Returns true if the socket meets the socket tuple data
3728 * (value 0 = 'any') or when there is no tuple set (all = 0),
3731 bool tipc_sk_filtering(struct sock *sk)
3733 struct tipc_sock *tsk;
3734 struct publication *p;
3735 u32 _port, _sktype, _type, _lower, _upper;
3736 u32 type = 0, lower = 0, upper = 0;
3743 _port = sysctl_tipc_sk_filter[0];
3744 _sktype = sysctl_tipc_sk_filter[1];
3745 _type = sysctl_tipc_sk_filter[2];
3746 _lower = sysctl_tipc_sk_filter[3];
3747 _upper = sysctl_tipc_sk_filter[4];
3749 if (!_port && !_sktype && !_type && !_lower && !_upper)
3753 return (_port == tsk->portid);
3755 if (_sktype && _sktype != sk->sk_type)
3758 if (tsk->published) {
3759 p = list_first_entry_or_null(&tsk->publications,
3760 struct publication, binding_sock);
3768 if (!tipc_sk_type_connectionless(sk)) {
3769 type = tsk->conn_type;
3770 lower = tsk->conn_instance;
3771 upper = tsk->conn_instance;
3774 if ((_type && _type != type) || (_lower && _lower != lower) ||
3775 (_upper && _upper != upper))
3781 u32 tipc_sock_get_portid(struct sock *sk)
3783 return (sk) ? (tipc_sk(sk))->portid : 0;
3787 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3788 * both the rcv and backlog queues are considered
3789 * @sk: tipc sk to be checked
3790 * @skb: tipc msg to be checked
3792 * Returns true if the socket rx queue allocation is > 90%, otherwise false
3795 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3797 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3798 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3799 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3801 return (qsize > lim * 90 / 100);
3805 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3806 * only the rcv queue is considered
3807 * @sk: tipc sk to be checked
3808 * @skb: tipc msg to be checked
3810 * Returns true if the socket rx queue allocation is > 90%, otherwise false
3813 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3815 unsigned int lim = rcvbuf_limit(sk, skb);
3816 unsigned int qsize = sk_rmem_alloc_get(sk);
3818 return (qsize > lim * 90 / 100);
3822 * tipc_sk_dump - dump TIPC socket
3823 * @sk: tipc sk to be dumped
3824 * @dqueues: bitmask to decide if any socket queue to be dumped?
3825 * - TIPC_DUMP_NONE: don't dump socket queues
3826 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3827 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3828 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3829 * - TIPC_DUMP_ALL: dump all the socket queues above
3830 * @buf: returned buffer of dump data in format
3832 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3835 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3836 struct tipc_sock *tsk;
3837 struct publication *p;
3841 i += scnprintf(buf, sz, "sk data: (null)\n");
3846 tsk_connected = !tipc_sk_type_connectionless(sk);
3848 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3849 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3850 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3851 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3852 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3853 if (tsk_connected) {
3854 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3855 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3856 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_type);
3857 i += scnprintf(buf + i, sz - i, " %u", tsk->conn_instance);
3859 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3860 if (tsk->published) {
3861 p = list_first_entry_or_null(&tsk->publications,
3862 struct publication, binding_sock);
3863 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->type : 0);
3864 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->lower : 0);
3865 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->upper : 0);
3867 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3868 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3869 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3870 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3871 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3872 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3873 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3874 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3875 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3876 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3877 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3878 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3879 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3880 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3882 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3883 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3884 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3887 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3888 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3889 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
3892 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
3893 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
3894 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
3895 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
3896 i += scnprintf(buf + i, sz - i, " tail ");
3897 i += tipc_skb_dump(sk->sk_backlog.tail, false,