2 * net/tipc/socket.c: TIPC socket API
4 * Copyright (c) 2001-2007, 2012-2019, Ericsson AB
5 * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
6 * Copyright (c) 2020-2021, Red Hat Inc
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the names of the copyright holders nor the names of its
18 * contributors may be used to endorse or promote products derived from
19 * this software without specific prior written permission.
21 * Alternatively, this software may be distributed under the terms of the
22 * GNU General Public License ("GPL") version 2 as published by the Free
23 * Software Foundation.
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
26 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
38 #include <linux/rhashtable.h>
39 #include <linux/sched/signal.h>
42 #include "name_table.h"
45 #include "name_distr.h"
52 #define NAGLE_START_INIT 4
53 #define NAGLE_START_MAX 1024
54 #define CONN_TIMEOUT_DEFAULT 8000 /* default connect timeout = 8s */
55 #define CONN_PROBING_INTV msecs_to_jiffies(3600000) /* [ms] => 1 h */
56 #define TIPC_MAX_PORT 0xffffffff
57 #define TIPC_MIN_PORT 1
58 #define TIPC_ACK_RATE 4 /* ACK at 1/4 of rcv window size */
61 TIPC_LISTEN = TCP_LISTEN,
62 TIPC_ESTABLISHED = TCP_ESTABLISHED,
63 TIPC_OPEN = TCP_CLOSE,
64 TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
65 TIPC_CONNECTING = TCP_SYN_SENT,
68 struct sockaddr_pair {
69 struct sockaddr_tipc sock;
70 struct sockaddr_tipc member;
74 * struct tipc_sock - TIPC socket structure
75 * @sk: socket - interacts with 'port' and with user via the socket API
76 * @max_pkt: maximum packet size "hint" used when building messages sent by port
77 * @maxnagle: maximum size of msg which can be subject to nagle
78 * @portid: unique port identity in TIPC socket hash table
79 * @phdr: preformatted message header used when sending messages
80 * @cong_links: list of congested links
81 * @publications: list of publications for port
82 * @blocking_link: address of the congested link we are currently sleeping on
83 * @pub_count: total # of publications port has made during its lifetime
84 * @conn_timeout: the time we can wait for an unresponded setup request
85 * @probe_unacked: probe has not received ack yet
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 * @snd_win: send window size
90 * @peer_caps: peer capabilities mask
91 * @rcv_unacked: # messages read by user, but not yet acked back to peer
92 * @rcv_win: receive window size
93 * @peer: 'connected' peer for dgram/rdm
94 * @node: hash table node
95 * @mc_method: cookie for use between socket and broadcast layer
96 * @rcu: rcu struct for tipc_sock
97 * @group: TIPC communications group
98 * @oneway: message count in one direction (FIXME)
99 * @nagle_start: current nagle value
100 * @snd_backlog: send backlog count
101 * @msg_acc: messages accepted; used in managing backlog and nagle
102 * @pkt_cnt: TIPC socket packet count
103 * @expect_ack: whether this TIPC socket is expecting an ack
104 * @nodelay: setsockopt() TIPC_NODELAY setting
105 * @group_is_open: TIPC socket group is fully open (FIXME)
106 * @published: true if port has one or more associated names
107 * @conn_addrtype: address type used when establishing connection
114 struct tipc_msg phdr;
115 struct list_head cong_links;
116 struct list_head publications;
118 atomic_t dupl_rcvcnt;
127 struct sockaddr_tipc peer;
128 struct rhash_head node;
129 struct tipc_mc_method mc_method;
131 struct tipc_group *group;
144 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
145 static void tipc_data_ready(struct sock *sk);
146 static void tipc_write_space(struct sock *sk);
147 static void tipc_sock_destruct(struct sock *sk);
148 static int tipc_release(struct socket *sock);
149 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
151 static void tipc_sk_timeout(struct timer_list *t);
152 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua);
153 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua);
154 static int tipc_sk_leave(struct tipc_sock *tsk);
155 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
156 static int tipc_sk_insert(struct tipc_sock *tsk);
157 static void tipc_sk_remove(struct tipc_sock *tsk);
158 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
159 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
160 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack);
161 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p);
163 static const struct proto_ops packet_ops;
164 static const struct proto_ops stream_ops;
165 static const struct proto_ops msg_ops;
166 static struct proto tipc_proto;
167 static const struct rhashtable_params tsk_rht_params;
169 static u32 tsk_own_node(struct tipc_sock *tsk)
171 return msg_prevnode(&tsk->phdr);
174 static u32 tsk_peer_node(struct tipc_sock *tsk)
176 return msg_destnode(&tsk->phdr);
179 static u32 tsk_peer_port(struct tipc_sock *tsk)
181 return msg_destport(&tsk->phdr);
184 static bool tsk_unreliable(struct tipc_sock *tsk)
186 return msg_src_droppable(&tsk->phdr) != 0;
189 static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
191 msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
194 static bool tsk_unreturnable(struct tipc_sock *tsk)
196 return msg_dest_droppable(&tsk->phdr) != 0;
199 static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
201 msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
204 static int tsk_importance(struct tipc_sock *tsk)
206 return msg_importance(&tsk->phdr);
209 static struct tipc_sock *tipc_sk(const struct sock *sk)
211 return container_of(sk, struct tipc_sock, sk);
214 int tsk_set_importance(struct sock *sk, int imp)
216 if (imp > TIPC_CRITICAL_IMPORTANCE)
218 msg_set_importance(&tipc_sk(sk)->phdr, (u32)imp);
222 static bool tsk_conn_cong(struct tipc_sock *tsk)
224 return tsk->snt_unacked > tsk->snd_win;
227 static u16 tsk_blocks(int len)
229 return ((len / FLOWCTL_BLK_SZ) + 1);
232 /* tsk_blocks(): translate a buffer size in bytes to number of
233 * advertisable blocks, taking into account the ratio truesize(len)/len
234 * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
236 static u16 tsk_adv_blocks(int len)
238 return len / FLOWCTL_BLK_SZ / 4;
241 /* tsk_inc(): increment counter for sent or received data
242 * - If block based flow control is not supported by peer we
243 * fall back to message based ditto, incrementing the counter
245 static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
247 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
248 return ((msglen / FLOWCTL_BLK_SZ) + 1);
252 /* tsk_set_nagle - enable/disable nagle property by manipulating maxnagle
254 static void tsk_set_nagle(struct tipc_sock *tsk)
256 struct sock *sk = &tsk->sk;
259 if (sk->sk_type != SOCK_STREAM)
263 if (!(tsk->peer_caps & TIPC_NAGLE))
265 /* Limit node local buffer size to avoid receive queue overflow */
266 if (tsk->max_pkt == MAX_MSG_SIZE)
267 tsk->maxnagle = 1500;
269 tsk->maxnagle = tsk->max_pkt;
273 * tsk_advance_rx_queue - discard first buffer in socket receive queue
274 * @sk: network socket
276 * Caller must hold socket lock
278 static void tsk_advance_rx_queue(struct sock *sk)
280 trace_tipc_sk_advance_rx(sk, NULL, TIPC_DUMP_SK_RCVQ, " ");
281 kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
284 /* tipc_sk_respond() : send response message back to sender
286 static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
290 u32 onode = tipc_own_addr(sock_net(sk));
292 if (!tipc_msg_reverse(onode, &skb, err))
295 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE, "@sk_respond!");
296 dnode = msg_destnode(buf_msg(skb));
297 selector = msg_origport(buf_msg(skb));
298 tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
302 * tsk_rej_rx_queue - reject all buffers in socket receive queue
303 * @sk: network socket
304 * @error: response error code
306 * Caller must hold socket lock
308 static void tsk_rej_rx_queue(struct sock *sk, int error)
312 while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
313 tipc_sk_respond(sk, skb, error);
316 static bool tipc_sk_connected(struct sock *sk)
318 return sk->sk_state == TIPC_ESTABLISHED;
321 /* tipc_sk_type_connectionless - check if the socket is datagram socket
324 * Returns true if connection less, false otherwise
326 static bool tipc_sk_type_connectionless(struct sock *sk)
328 return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
331 /* tsk_peer_msg - verify if message was sent by connected port's peer
333 * Handles cases where the node's network address has changed from
334 * the default of <0.0.0> to its configured setting.
336 static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
338 struct sock *sk = &tsk->sk;
339 u32 self = tipc_own_addr(sock_net(sk));
340 u32 peer_port = tsk_peer_port(tsk);
341 u32 orig_node, peer_node;
343 if (unlikely(!tipc_sk_connected(sk)))
346 if (unlikely(msg_origport(msg) != peer_port))
349 orig_node = msg_orignode(msg);
350 peer_node = tsk_peer_node(tsk);
352 if (likely(orig_node == peer_node))
355 if (!orig_node && peer_node == self)
358 if (!peer_node && orig_node == self)
364 /* tipc_set_sk_state - set the sk_state of the socket
367 * Caller must hold socket lock
369 * Returns 0 on success, errno otherwise
371 static int tipc_set_sk_state(struct sock *sk, int state)
373 int oldsk_state = sk->sk_state;
381 case TIPC_CONNECTING:
382 if (oldsk_state == TIPC_OPEN)
385 case TIPC_ESTABLISHED:
386 if (oldsk_state == TIPC_CONNECTING ||
387 oldsk_state == TIPC_OPEN)
390 case TIPC_DISCONNECTING:
391 if (oldsk_state == TIPC_CONNECTING ||
392 oldsk_state == TIPC_ESTABLISHED)
398 sk->sk_state = state;
403 static int tipc_sk_sock_err(struct socket *sock, long *timeout)
405 struct sock *sk = sock->sk;
406 int err = sock_error(sk);
407 int typ = sock->type;
411 if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
412 if (sk->sk_state == TIPC_DISCONNECTING)
414 else if (!tipc_sk_connected(sk))
419 if (signal_pending(current))
420 return sock_intr_errno(*timeout);
425 #define tipc_wait_for_cond(sock_, timeo_, condition_) \
427 DEFINE_WAIT_FUNC(wait_, woken_wake_function); \
431 while ((rc_ = !(condition_))) { \
432 /* coupled with smp_wmb() in tipc_sk_proto_rcv() */ \
435 rc_ = tipc_sk_sock_err((sock_), timeo_); \
438 add_wait_queue(sk_sleep(sk_), &wait_); \
440 *(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
441 sched_annotate_sleep(); \
443 remove_wait_queue(sk_sleep(sk_), &wait_); \
449 * tipc_sk_create - create a TIPC socket
450 * @net: network namespace (must be default network)
451 * @sock: pre-allocated socket structure
452 * @protocol: protocol indicator (must be 0)
453 * @kern: caused by kernel or by userspace?
455 * This routine creates additional data structures used by the TIPC socket,
456 * initializes them, and links them together.
458 * Return: 0 on success, errno otherwise
460 static int tipc_sk_create(struct net *net, struct socket *sock,
461 int protocol, int kern)
463 const struct proto_ops *ops;
465 struct tipc_sock *tsk;
466 struct tipc_msg *msg;
468 /* Validate arguments */
469 if (unlikely(protocol != 0))
470 return -EPROTONOSUPPORT;
472 switch (sock->type) {
487 /* Allocate socket's protocol area */
488 sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
493 tsk->max_pkt = MAX_PKT_DEFAULT;
495 tsk->nagle_start = NAGLE_START_INIT;
496 INIT_LIST_HEAD(&tsk->publications);
497 INIT_LIST_HEAD(&tsk->cong_links);
500 /* Finish initializing socket data structures */
502 sock_init_data(sock, sk);
503 tipc_set_sk_state(sk, TIPC_OPEN);
504 if (tipc_sk_insert(tsk)) {
505 pr_warn("Socket create failed; port number exhausted\n");
509 /* Ensure tsk is visible before we read own_addr. */
512 tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
513 TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
515 msg_set_origport(msg, tsk->portid);
516 timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
518 sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
519 sk->sk_rcvbuf = sysctl_tipc_rmem[1];
520 sk->sk_data_ready = tipc_data_ready;
521 sk->sk_write_space = tipc_write_space;
522 sk->sk_destruct = tipc_sock_destruct;
523 tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
524 tsk->group_is_open = true;
525 atomic_set(&tsk->dupl_rcvcnt, 0);
527 /* Start out with safe limits until we receive an advertised window */
528 tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
529 tsk->rcv_win = tsk->snd_win;
531 if (tipc_sk_type_connectionless(sk)) {
532 tsk_set_unreturnable(tsk, true);
533 if (sock->type == SOCK_DGRAM)
534 tsk_set_unreliable(tsk, true);
536 __skb_queue_head_init(&tsk->mc_method.deferredq);
537 trace_tipc_sk_create(sk, NULL, TIPC_DUMP_NONE, " ");
541 static void tipc_sk_callback(struct rcu_head *head)
543 struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
548 /* Caller should hold socket lock for the socket. */
549 static void __tipc_shutdown(struct socket *sock, int error)
551 struct sock *sk = sock->sk;
552 struct tipc_sock *tsk = tipc_sk(sk);
553 struct net *net = sock_net(sk);
554 long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
555 u32 dnode = tsk_peer_node(tsk);
558 /* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
559 tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
560 !tsk_conn_cong(tsk)));
562 /* Push out delayed messages if in Nagle mode */
563 tipc_sk_push_backlog(tsk, false);
564 /* Remove pending SYN */
565 __skb_queue_purge(&sk->sk_write_queue);
567 /* Remove partially received buffer if any */
568 skb = skb_peek(&sk->sk_receive_queue);
569 if (skb && TIPC_SKB_CB(skb)->bytes_read) {
570 __skb_unlink(skb, &sk->sk_receive_queue);
574 /* Reject all unreceived messages if connectionless */
575 if (tipc_sk_type_connectionless(sk)) {
576 tsk_rej_rx_queue(sk, error);
580 switch (sk->sk_state) {
581 case TIPC_CONNECTING:
582 case TIPC_ESTABLISHED:
583 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
584 tipc_node_remove_conn(net, dnode, tsk->portid);
585 /* Send a FIN+/- to its peer */
586 skb = __skb_dequeue(&sk->sk_receive_queue);
588 __skb_queue_purge(&sk->sk_receive_queue);
589 tipc_sk_respond(sk, skb, error);
592 skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
593 TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
594 tsk_own_node(tsk), tsk_peer_port(tsk),
597 tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
600 /* Reject all SYN messages */
601 tsk_rej_rx_queue(sk, error);
604 __skb_queue_purge(&sk->sk_receive_queue);
610 * tipc_release - destroy a TIPC socket
611 * @sock: socket to destroy
613 * This routine cleans up any messages that are still queued on the socket.
614 * For DGRAM and RDM socket types, all queued messages are rejected.
615 * For SEQPACKET and STREAM socket types, the first message is rejected
616 * and any others are discarded. (If the first message on a STREAM socket
617 * is partially-read, it is discarded and the next one is rejected instead.)
619 * NOTE: Rejected messages are not necessarily returned to the sender! They
620 * are returned or discarded according to the "destination droppable" setting
621 * specified for the message by the sender.
623 * Return: 0 on success, errno otherwise
625 static int tipc_release(struct socket *sock)
627 struct sock *sk = sock->sk;
628 struct tipc_sock *tsk;
631 * Exit if socket isn't fully initialized (occurs when a failed accept()
632 * releases a pre-allocated child socket that was never used)
640 trace_tipc_sk_release(sk, NULL, TIPC_DUMP_ALL, " ");
641 __tipc_shutdown(sock, TIPC_ERR_NO_PORT);
642 sk->sk_shutdown = SHUTDOWN_MASK;
644 tipc_sk_withdraw(tsk, NULL);
645 __skb_queue_purge(&tsk->mc_method.deferredq);
646 sk_stop_timer(sk, &sk->sk_timer);
650 /* Reject any messages that accumulated in backlog queue */
652 tipc_dest_list_purge(&tsk->cong_links);
653 tsk->cong_link_cnt = 0;
654 call_rcu(&tsk->rcu, tipc_sk_callback);
661 * __tipc_bind - associate or disassocate TIPC name(s) with a socket
662 * @sock: socket structure
663 * @skaddr: socket address describing name(s) and desired operation
664 * @alen: size of socket address data structure
666 * Name and name sequence binding are indicated using a positive scope value;
667 * a negative scope value unbinds the specified name. Specifying no name
668 * (i.e. a socket address length of 0) unbinds all names from the socket.
670 * Return: 0 on success, errno otherwise
672 * NOTE: This routine doesn't need to take the socket lock since it doesn't
673 * access any non-constant socket information.
675 static int __tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
677 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
678 struct tipc_sock *tsk = tipc_sk(sock->sk);
682 return tipc_sk_withdraw(tsk, NULL);
684 if (ua->addrtype == TIPC_SERVICE_ADDR) {
685 ua->addrtype = TIPC_SERVICE_RANGE;
686 ua->sr.upper = ua->sr.lower;
690 ua->scope = -ua->scope;
692 /* Users may still use deprecated TIPC_ZONE_SCOPE */
693 if (ua->scope != TIPC_NODE_SCOPE)
694 ua->scope = TIPC_CLUSTER_SCOPE;
700 return tipc_sk_withdraw(tsk, ua);
701 return tipc_sk_publish(tsk, ua);
704 int tipc_sk_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
709 res = __tipc_bind(sock, skaddr, alen);
710 release_sock(sock->sk);
714 static int tipc_bind(struct socket *sock, struct sockaddr *skaddr, int alen)
716 struct tipc_uaddr *ua = (struct tipc_uaddr *)skaddr;
717 u32 atype = ua->addrtype;
720 if (!tipc_uaddr_valid(ua, alen))
722 if (atype == TIPC_SOCKET_ADDR)
723 return -EAFNOSUPPORT;
724 if (ua->sr.type < TIPC_RESERVED_TYPES) {
725 pr_warn_once("Can't bind to reserved service type %u\n",
730 return tipc_sk_bind(sock, skaddr, alen);
734 * tipc_getname - get port ID of socket or peer socket
735 * @sock: socket structure
736 * @uaddr: area for returned socket address
737 * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
739 * Return: 0 on success, errno otherwise
741 * NOTE: This routine doesn't need to take the socket lock since it only
742 * accesses socket information that is unchanging (or which changes in
743 * a completely predictable manner).
745 static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
748 struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
749 struct sock *sk = sock->sk;
750 struct tipc_sock *tsk = tipc_sk(sk);
752 memset(addr, 0, sizeof(*addr));
754 if ((!tipc_sk_connected(sk)) &&
755 ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
757 addr->addr.id.ref = tsk_peer_port(tsk);
758 addr->addr.id.node = tsk_peer_node(tsk);
760 addr->addr.id.ref = tsk->portid;
761 addr->addr.id.node = tipc_own_addr(sock_net(sk));
764 addr->addrtype = TIPC_SOCKET_ADDR;
765 addr->family = AF_TIPC;
767 addr->addr.name.domain = 0;
769 return sizeof(*addr);
773 * tipc_poll - read and possibly block on pollmask
774 * @file: file structure associated with the socket
775 * @sock: socket for which to calculate the poll bits
778 * Return: pollmask value
781 * It appears that the usual socket locking mechanisms are not useful here
782 * since the pollmask info is potentially out-of-date the moment this routine
783 * exits. TCP and other protocols seem to rely on higher level poll routines
784 * to handle any preventable race conditions, so TIPC will do the same ...
786 * IMPORTANT: The fact that a read or write operation is indicated does NOT
787 * imply that the operation will succeed, merely that it should be performed
788 * and will not block.
790 static __poll_t tipc_poll(struct file *file, struct socket *sock,
793 struct sock *sk = sock->sk;
794 struct tipc_sock *tsk = tipc_sk(sk);
795 __poll_t revents = 0;
797 sock_poll_wait(file, sock, wait);
798 trace_tipc_sk_poll(sk, NULL, TIPC_DUMP_ALL, " ");
800 if (sk->sk_shutdown & RCV_SHUTDOWN)
801 revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
802 if (sk->sk_shutdown == SHUTDOWN_MASK)
805 switch (sk->sk_state) {
806 case TIPC_ESTABLISHED:
807 if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
811 case TIPC_CONNECTING:
812 if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
813 revents |= EPOLLIN | EPOLLRDNORM;
816 if (tsk->group_is_open && !tsk->cong_link_cnt)
818 if (!tipc_sk_type_connectionless(sk))
820 if (skb_queue_empty_lockless(&sk->sk_receive_queue))
822 revents |= EPOLLIN | EPOLLRDNORM;
824 case TIPC_DISCONNECTING:
825 revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
832 * tipc_sendmcast - send multicast message
833 * @sock: socket structure
834 * @ua: destination address struct
835 * @msg: message to send
836 * @dlen: length of data to send
837 * @timeout: timeout to wait for wakeup
839 * Called from function tipc_sendmsg(), which has done all sanity checks
840 * Return: the number of bytes sent on success, or errno
842 static int tipc_sendmcast(struct socket *sock, struct tipc_uaddr *ua,
843 struct msghdr *msg, size_t dlen, long timeout)
845 struct sock *sk = sock->sk;
846 struct tipc_sock *tsk = tipc_sk(sk);
847 struct tipc_msg *hdr = &tsk->phdr;
848 struct net *net = sock_net(sk);
849 int mtu = tipc_bcast_get_mtu(net);
850 struct sk_buff_head pkts;
851 struct tipc_nlist dsts;
857 /* Block or return if any destination link is congested */
858 rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
862 /* Lookup destination nodes */
863 tipc_nlist_init(&dsts, tipc_own_addr(net));
864 tipc_nametbl_lookup_mcast_nodes(net, ua, &dsts);
865 if (!dsts.local && !dsts.remote)
866 return -EHOSTUNREACH;
868 /* Build message header */
869 msg_set_type(hdr, TIPC_MCAST_MSG);
870 msg_set_hdr_sz(hdr, MCAST_H_SIZE);
871 msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
872 msg_set_destport(hdr, 0);
873 msg_set_destnode(hdr, 0);
874 msg_set_nametype(hdr, ua->sr.type);
875 msg_set_namelower(hdr, ua->sr.lower);
876 msg_set_nameupper(hdr, ua->sr.upper);
878 /* Build message as chain of buffers */
879 __skb_queue_head_init(&pkts);
880 rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
882 /* Send message if build was successful */
883 if (unlikely(rc == dlen)) {
884 trace_tipc_sk_sendmcast(sk, skb_peek(&pkts),
885 TIPC_DUMP_SK_SNDQ, " ");
886 rc = tipc_mcast_xmit(net, &pkts, &tsk->mc_method, &dsts,
887 &tsk->cong_link_cnt);
890 tipc_nlist_purge(&dsts);
892 return rc ? rc : dlen;
896 * tipc_send_group_msg - send a message to a member in the group
897 * @net: network namespace
899 * @m: message to send
901 * @dnode: destination node
902 * @dport: destination port
903 * @dlen: total length of message data
905 static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
906 struct msghdr *m, struct tipc_member *mb,
907 u32 dnode, u32 dport, int dlen)
909 u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
910 struct tipc_mc_method *method = &tsk->mc_method;
911 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
912 struct tipc_msg *hdr = &tsk->phdr;
913 struct sk_buff_head pkts;
916 /* Complete message header */
917 msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
918 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
919 msg_set_destport(hdr, dport);
920 msg_set_destnode(hdr, dnode);
921 msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
923 /* Build message as chain of buffers */
924 __skb_queue_head_init(&pkts);
925 mtu = tipc_node_get_mtu(net, dnode, tsk->portid, false);
926 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
927 if (unlikely(rc != dlen))
931 rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
932 if (unlikely(rc == -ELINKCONG)) {
933 tipc_dest_push(&tsk->cong_links, dnode, 0);
934 tsk->cong_link_cnt++;
937 /* Update send window */
938 tipc_group_update_member(mb, blks);
940 /* A broadcast sent within next EXPIRE period must follow same path */
941 method->rcast = true;
942 method->mandatory = true;
947 * tipc_send_group_unicast - send message to a member in the group
948 * @sock: socket structure
949 * @m: message to send
950 * @dlen: total length of message data
951 * @timeout: timeout to wait for wakeup
953 * Called from function tipc_sendmsg(), which has done all sanity checks
954 * Return: the number of bytes sent on success, or errno
956 static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
957 int dlen, long timeout)
959 struct sock *sk = sock->sk;
960 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
961 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
962 struct tipc_sock *tsk = tipc_sk(sk);
963 struct net *net = sock_net(sk);
964 struct tipc_member *mb = NULL;
971 return -EHOSTUNREACH;
973 /* Block or return if destination link or member is congested */
974 rc = tipc_wait_for_cond(sock, &timeout,
975 !tipc_dest_find(&tsk->cong_links, node, 0) &&
977 !tipc_group_cong(tsk->group, node, port, blks,
983 return -EHOSTUNREACH;
985 rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
987 return rc ? rc : dlen;
991 * tipc_send_group_anycast - send message to any member with given identity
992 * @sock: socket structure
993 * @m: message to send
994 * @dlen: total length of message data
995 * @timeout: timeout to wait for wakeup
997 * Called from function tipc_sendmsg(), which has done all sanity checks
998 * Return: the number of bytes sent on success, or errno
1000 static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
1001 int dlen, long timeout)
1003 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1004 struct sock *sk = sock->sk;
1005 struct tipc_sock *tsk = tipc_sk(sk);
1006 struct list_head *cong_links = &tsk->cong_links;
1007 int blks = tsk_blocks(GROUP_H_SIZE + dlen);
1008 struct tipc_msg *hdr = &tsk->phdr;
1009 struct tipc_member *first = NULL;
1010 struct tipc_member *mbr = NULL;
1011 struct net *net = sock_net(sk);
1012 u32 node, port, exclude;
1013 struct list_head dsts;
1018 INIT_LIST_HEAD(&dsts);
1019 ua->sa.type = msg_nametype(hdr);
1020 ua->scope = msg_lookup_scope(hdr);
1022 while (++lookups < 4) {
1023 exclude = tipc_group_exclude(tsk->group);
1027 /* Look for a non-congested destination member, if any */
1029 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt,
1031 return -EHOSTUNREACH;
1032 tipc_dest_pop(&dsts, &node, &port);
1033 cong = tipc_group_cong(tsk->group, node, port, blks,
1043 /* Start over if destination was not in member list */
1047 if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
1050 /* Block or return if destination link or member is congested */
1051 rc = tipc_wait_for_cond(sock, &timeout,
1052 !tipc_dest_find(cong_links, node, 0) &&
1054 !tipc_group_cong(tsk->group, node, port,
1059 /* Send, unless destination disappeared while waiting */
1064 if (unlikely(lookups >= 4))
1065 return -EHOSTUNREACH;
1067 rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
1069 return rc ? rc : dlen;
1073 * tipc_send_group_bcast - send message to all members in communication group
1074 * @sock: socket structure
1075 * @m: message to send
1076 * @dlen: total length of message data
1077 * @timeout: timeout to wait for wakeup
1079 * Called from function tipc_sendmsg(), which has done all sanity checks
1080 * Return: the number of bytes sent on success, or errno
1082 static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
1083 int dlen, long timeout)
1085 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1086 struct sock *sk = sock->sk;
1087 struct net *net = sock_net(sk);
1088 struct tipc_sock *tsk = tipc_sk(sk);
1089 struct tipc_nlist *dsts;
1090 struct tipc_mc_method *method = &tsk->mc_method;
1091 bool ack = method->mandatory && method->rcast;
1092 int blks = tsk_blocks(MCAST_H_SIZE + dlen);
1093 struct tipc_msg *hdr = &tsk->phdr;
1094 int mtu = tipc_bcast_get_mtu(net);
1095 struct sk_buff_head pkts;
1096 int rc = -EHOSTUNREACH;
1098 /* Block or return if any destination link or member is congested */
1099 rc = tipc_wait_for_cond(sock, &timeout,
1100 !tsk->cong_link_cnt && tsk->group &&
1101 !tipc_group_bc_cong(tsk->group, blks));
1105 dsts = tipc_group_dests(tsk->group);
1106 if (!dsts->local && !dsts->remote)
1107 return -EHOSTUNREACH;
1109 /* Complete message header */
1111 msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
1112 msg_set_nameinst(hdr, ua->sa.instance);
1114 msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
1115 msg_set_nameinst(hdr, 0);
1117 msg_set_hdr_sz(hdr, GROUP_H_SIZE);
1118 msg_set_destport(hdr, 0);
1119 msg_set_destnode(hdr, 0);
1120 msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
1122 /* Avoid getting stuck with repeated forced replicasts */
1123 msg_set_grp_bc_ack_req(hdr, ack);
1125 /* Build message as chain of buffers */
1126 __skb_queue_head_init(&pkts);
1127 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1128 if (unlikely(rc != dlen))
1132 rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
1136 /* Update broadcast sequence number and send windows */
1137 tipc_group_update_bc_members(tsk->group, blks, ack);
1139 /* Broadcast link is now free to choose method for next broadcast */
1140 method->mandatory = false;
1141 method->expires = jiffies;
1147 * tipc_send_group_mcast - send message to all members with given identity
1148 * @sock: socket structure
1149 * @m: message to send
1150 * @dlen: total length of message data
1151 * @timeout: timeout to wait for wakeup
1153 * Called from function tipc_sendmsg(), which has done all sanity checks
1154 * Return: the number of bytes sent on success, or errno
1156 static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
1157 int dlen, long timeout)
1159 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1160 struct sock *sk = sock->sk;
1161 struct tipc_sock *tsk = tipc_sk(sk);
1162 struct tipc_group *grp = tsk->group;
1163 struct tipc_msg *hdr = &tsk->phdr;
1164 struct net *net = sock_net(sk);
1165 struct list_head dsts;
1166 u32 dstcnt, exclude;
1168 INIT_LIST_HEAD(&dsts);
1169 ua->sa.type = msg_nametype(hdr);
1170 ua->scope = msg_lookup_scope(hdr);
1171 exclude = tipc_group_exclude(grp);
1173 if (!tipc_nametbl_lookup_group(net, ua, &dsts, &dstcnt, exclude, true))
1174 return -EHOSTUNREACH;
1177 tipc_dest_pop(&dsts, &ua->sk.node, &ua->sk.ref);
1178 return tipc_send_group_unicast(sock, m, dlen, timeout);
1181 tipc_dest_list_purge(&dsts);
1182 return tipc_send_group_bcast(sock, m, dlen, timeout);
1186 * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
1187 * @net: the associated network namespace
1188 * @arrvq: queue with arriving messages, to be cloned after destination lookup
1189 * @inputq: queue with cloned messages, delivered to socket after dest lookup
1191 * Multi-threaded: parallel calls with reference to same queues may occur
1193 void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
1194 struct sk_buff_head *inputq)
1196 u32 self = tipc_own_addr(net);
1197 struct sk_buff *skb, *_skb;
1199 struct sk_buff_head tmpq;
1200 struct list_head dports;
1201 struct tipc_msg *hdr;
1202 struct tipc_uaddr ua;
1203 int user, mtyp, hlen;
1205 __skb_queue_head_init(&tmpq);
1206 INIT_LIST_HEAD(&dports);
1207 ua.addrtype = TIPC_SERVICE_RANGE;
1209 /* tipc_skb_peek() increments the head skb's reference counter */
1210 skb = tipc_skb_peek(arrvq, &inputq->lock);
1211 for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
1213 user = msg_user(hdr);
1214 mtyp = msg_type(hdr);
1215 hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
1216 onode = msg_orignode(hdr);
1217 ua.sr.type = msg_nametype(hdr);
1218 ua.sr.lower = msg_namelower(hdr);
1219 ua.sr.upper = msg_nameupper(hdr);
1221 ua.scope = TIPC_ANY_SCOPE;
1223 ua.scope = TIPC_CLUSTER_SCOPE;
1225 if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
1226 spin_lock_bh(&inputq->lock);
1227 if (skb_peek(arrvq) == skb) {
1228 __skb_dequeue(arrvq);
1229 __skb_queue_tail(inputq, skb);
1232 spin_unlock_bh(&inputq->lock);
1236 /* Group messages require exact scope match */
1237 if (msg_in_group(hdr)) {
1240 ua.scope = msg_lookup_scope(hdr);
1243 /* Create destination port list: */
1244 tipc_nametbl_lookup_mcast_sockets(net, &ua, &dports);
1246 /* Clone message per destination */
1247 while (tipc_dest_pop(&dports, NULL, &portid)) {
1248 _skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
1250 msg_set_destport(buf_msg(_skb), portid);
1251 __skb_queue_tail(&tmpq, _skb);
1254 pr_warn("Failed to clone mcast rcv buffer\n");
1256 /* Append clones to inputq only if skb is still head of arrvq */
1257 spin_lock_bh(&inputq->lock);
1258 if (skb_peek(arrvq) == skb) {
1259 skb_queue_splice_tail_init(&tmpq, inputq);
1260 /* Decrement the skb's refcnt */
1261 kfree_skb(__skb_dequeue(arrvq));
1263 spin_unlock_bh(&inputq->lock);
1264 __skb_queue_purge(&tmpq);
1267 tipc_sk_rcv(net, inputq);
1270 /* tipc_sk_push_backlog(): send accumulated buffers in socket write queue
1271 * when socket is in Nagle mode
1273 static void tipc_sk_push_backlog(struct tipc_sock *tsk, bool nagle_ack)
1275 struct sk_buff_head *txq = &tsk->sk.sk_write_queue;
1276 struct sk_buff *skb = skb_peek_tail(txq);
1277 struct net *net = sock_net(&tsk->sk);
1278 u32 dnode = tsk_peer_node(tsk);
1282 tsk->pkt_cnt += skb_queue_len(txq);
1283 if (!tsk->pkt_cnt || tsk->msg_acc / tsk->pkt_cnt < 2) {
1285 if (tsk->nagle_start < NAGLE_START_MAX)
1286 tsk->nagle_start *= 2;
1287 tsk->expect_ack = false;
1288 pr_debug("tsk %10u: bad nagle %u -> %u, next start %u!\n",
1289 tsk->portid, tsk->msg_acc, tsk->pkt_cnt,
1292 tsk->nagle_start = NAGLE_START_INIT;
1294 msg_set_ack_required(buf_msg(skb));
1295 tsk->expect_ack = true;
1297 tsk->expect_ack = false;
1304 if (!skb || tsk->cong_link_cnt)
1307 /* Do not send SYN again after congestion */
1308 if (msg_is_syn(buf_msg(skb)))
1312 tsk->pkt_cnt += skb_queue_len(txq);
1313 tsk->snt_unacked += tsk->snd_backlog;
1314 tsk->snd_backlog = 0;
1315 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1316 if (rc == -ELINKCONG)
1317 tsk->cong_link_cnt = 1;
1321 * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
1322 * @tsk: receiving socket
1323 * @skb: pointer to message buffer.
1324 * @inputq: buffer list containing the buffers
1325 * @xmitq: output message area
1327 static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
1328 struct sk_buff_head *inputq,
1329 struct sk_buff_head *xmitq)
1331 struct tipc_msg *hdr = buf_msg(skb);
1332 u32 onode = tsk_own_node(tsk);
1333 struct sock *sk = &tsk->sk;
1334 int mtyp = msg_type(hdr);
1337 /* Ignore if connection cannot be validated: */
1338 if (!tsk_peer_msg(tsk, hdr)) {
1339 trace_tipc_sk_drop_msg(sk, skb, TIPC_DUMP_NONE, "@proto_rcv!");
1343 if (unlikely(msg_errcode(hdr))) {
1344 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
1345 tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
1346 tsk_peer_port(tsk));
1347 sk->sk_state_change(sk);
1349 /* State change is ignored if socket already awake,
1350 * - convert msg to abort msg and add to inqueue
1352 msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
1353 msg_set_type(hdr, TIPC_CONN_MSG);
1354 msg_set_size(hdr, BASIC_H_SIZE);
1355 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1356 __skb_queue_tail(inputq, skb);
1360 tsk->probe_unacked = false;
1362 if (mtyp == CONN_PROBE) {
1363 msg_set_type(hdr, CONN_PROBE_REPLY);
1364 if (tipc_msg_reverse(onode, &skb, TIPC_OK))
1365 __skb_queue_tail(xmitq, skb);
1367 } else if (mtyp == CONN_ACK) {
1368 was_cong = tsk_conn_cong(tsk);
1369 tipc_sk_push_backlog(tsk, msg_nagle_ack(hdr));
1370 tsk->snt_unacked -= msg_conn_ack(hdr);
1371 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1372 tsk->snd_win = msg_adv_win(hdr);
1373 if (was_cong && !tsk_conn_cong(tsk))
1374 sk->sk_write_space(sk);
1375 } else if (mtyp != CONN_PROBE_REPLY) {
1376 pr_warn("Received unknown CONN_PROTO msg\n");
1383 * tipc_sendmsg - send message in connectionless manner
1384 * @sock: socket structure
1385 * @m: message to send
1386 * @dsz: amount of user data to be sent
1388 * Message must have an destination specified explicitly.
1389 * Used for SOCK_RDM and SOCK_DGRAM messages,
1390 * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
1391 * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
1393 * Return: the number of bytes sent on success, or errno otherwise
1395 static int tipc_sendmsg(struct socket *sock,
1396 struct msghdr *m, size_t dsz)
1398 struct sock *sk = sock->sk;
1402 ret = __tipc_sendmsg(sock, m, dsz);
1408 static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
1410 struct sock *sk = sock->sk;
1411 struct net *net = sock_net(sk);
1412 struct tipc_sock *tsk = tipc_sk(sk);
1413 struct tipc_uaddr *ua = (struct tipc_uaddr *)m->msg_name;
1414 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1415 struct list_head *clinks = &tsk->cong_links;
1416 bool syn = !tipc_sk_type_connectionless(sk);
1417 struct tipc_group *grp = tsk->group;
1418 struct tipc_msg *hdr = &tsk->phdr;
1419 struct tipc_socket_addr skaddr;
1420 struct sk_buff_head pkts;
1423 if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
1427 if (!tipc_uaddr_valid(ua, m->msg_namelen))
1429 atype = ua->addrtype;
1432 /* If socket belongs to a communication group follow other paths */
1435 return tipc_send_group_bcast(sock, m, dlen, timeout);
1436 if (atype == TIPC_SERVICE_ADDR)
1437 return tipc_send_group_anycast(sock, m, dlen, timeout);
1438 if (atype == TIPC_SOCKET_ADDR)
1439 return tipc_send_group_unicast(sock, m, dlen, timeout);
1440 if (atype == TIPC_SERVICE_RANGE)
1441 return tipc_send_group_mcast(sock, m, dlen, timeout);
1446 ua = (struct tipc_uaddr *)&tsk->peer;
1447 if (!syn && ua->family != AF_TIPC)
1448 return -EDESTADDRREQ;
1449 atype = ua->addrtype;
1452 if (unlikely(syn)) {
1453 if (sk->sk_state == TIPC_LISTEN)
1455 if (sk->sk_state != TIPC_OPEN)
1459 if (atype == TIPC_SERVICE_ADDR)
1460 tsk->conn_addrtype = atype;
1461 msg_set_syn(hdr, 1);
1464 /* Determine destination */
1465 if (atype == TIPC_SERVICE_RANGE) {
1466 return tipc_sendmcast(sock, ua, m, dlen, timeout);
1467 } else if (atype == TIPC_SERVICE_ADDR) {
1468 skaddr.node = ua->lookup_node;
1469 ua->scope = tipc_node2scope(skaddr.node);
1470 if (!tipc_nametbl_lookup_anycast(net, ua, &skaddr))
1471 return -EHOSTUNREACH;
1472 } else if (atype == TIPC_SOCKET_ADDR) {
1478 /* Block or return if destination link is congested */
1479 rc = tipc_wait_for_cond(sock, &timeout,
1480 !tipc_dest_find(clinks, skaddr.node, 0));
1484 /* Finally build message header */
1485 msg_set_destnode(hdr, skaddr.node);
1486 msg_set_destport(hdr, skaddr.ref);
1487 if (atype == TIPC_SERVICE_ADDR) {
1488 msg_set_type(hdr, TIPC_NAMED_MSG);
1489 msg_set_hdr_sz(hdr, NAMED_H_SIZE);
1490 msg_set_nametype(hdr, ua->sa.type);
1491 msg_set_nameinst(hdr, ua->sa.instance);
1492 msg_set_lookup_scope(hdr, ua->scope);
1493 } else { /* TIPC_SOCKET_ADDR */
1494 msg_set_type(hdr, TIPC_DIRECT_MSG);
1495 msg_set_lookup_scope(hdr, 0);
1496 msg_set_hdr_sz(hdr, BASIC_H_SIZE);
1499 /* Add message body */
1500 __skb_queue_head_init(&pkts);
1501 mtu = tipc_node_get_mtu(net, skaddr.node, tsk->portid, true);
1502 rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
1503 if (unlikely(rc != dlen))
1505 if (unlikely(syn && !tipc_msg_skb_clone(&pkts, &sk->sk_write_queue))) {
1506 __skb_queue_purge(&pkts);
1511 trace_tipc_sk_sendmsg(sk, skb_peek(&pkts), TIPC_DUMP_SK_SNDQ, " ");
1512 rc = tipc_node_xmit(net, &pkts, skaddr.node, tsk->portid);
1513 if (unlikely(rc == -ELINKCONG)) {
1514 tipc_dest_push(clinks, skaddr.node, 0);
1515 tsk->cong_link_cnt++;
1519 if (unlikely(syn && !rc)) {
1520 tipc_set_sk_state(sk, TIPC_CONNECTING);
1522 timeout = msecs_to_jiffies(timeout);
1523 tipc_wait_for_connect(sock, &timeout);
1527 return rc ? rc : dlen;
1531 * tipc_sendstream - send stream-oriented data
1532 * @sock: socket structure
1534 * @dsz: total length of data to be transmitted
1536 * Used for SOCK_STREAM data.
1538 * Return: the number of bytes sent on success (or partial success),
1539 * or errno if no data sent
1541 static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
1543 struct sock *sk = sock->sk;
1547 ret = __tipc_sendstream(sock, m, dsz);
1553 static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
1555 struct sock *sk = sock->sk;
1556 DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
1557 long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
1558 struct sk_buff_head *txq = &sk->sk_write_queue;
1559 struct tipc_sock *tsk = tipc_sk(sk);
1560 struct tipc_msg *hdr = &tsk->phdr;
1561 struct net *net = sock_net(sk);
1562 struct sk_buff *skb;
1563 u32 dnode = tsk_peer_node(tsk);
1564 int maxnagle = tsk->maxnagle;
1565 int maxpkt = tsk->max_pkt;
1569 if (unlikely(dlen > INT_MAX))
1572 /* Handle implicit connection setup */
1573 if (unlikely(dest && sk->sk_state == TIPC_OPEN)) {
1574 rc = __tipc_sendmsg(sock, m, dlen);
1575 if (dlen && dlen == rc) {
1576 tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
1577 tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
1583 rc = tipc_wait_for_cond(sock, &timeout,
1584 (!tsk->cong_link_cnt &&
1585 !tsk_conn_cong(tsk) &&
1586 tipc_sk_connected(sk)));
1589 send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
1590 blocks = tsk->snd_backlog;
1591 if (tsk->oneway++ >= tsk->nagle_start && maxnagle &&
1593 rc = tipc_msg_append(hdr, m, send, maxnagle, txq);
1594 if (unlikely(rc < 0))
1598 if (blocks <= 64 && tsk->expect_ack) {
1599 tsk->snd_backlog = blocks;
1602 } else if (blocks > 64) {
1603 tsk->pkt_cnt += skb_queue_len(txq);
1605 skb = skb_peek_tail(txq);
1607 msg_set_ack_required(buf_msg(skb));
1608 tsk->expect_ack = true;
1610 tsk->expect_ack = false;
1616 rc = tipc_msg_build(hdr, m, sent, send, maxpkt, txq);
1617 if (unlikely(rc != send))
1619 blocks += tsk_inc(tsk, send + MIN_H_SIZE);
1621 trace_tipc_sk_sendstream(sk, skb_peek(txq),
1622 TIPC_DUMP_SK_SNDQ, " ");
1623 rc = tipc_node_xmit(net, txq, dnode, tsk->portid);
1624 if (unlikely(rc == -ELINKCONG)) {
1625 tsk->cong_link_cnt = 1;
1629 tsk->snt_unacked += blocks;
1630 tsk->snd_backlog = 0;
1633 } while (sent < dlen && !rc);
1635 return sent ? sent : rc;
1639 * tipc_send_packet - send a connection-oriented message
1640 * @sock: socket structure
1641 * @m: message to send
1642 * @dsz: length of data to be transmitted
1644 * Used for SOCK_SEQPACKET messages.
1646 * Return: the number of bytes sent on success, or errno otherwise
1648 static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
1650 if (dsz > TIPC_MAX_USER_MSG_SIZE)
1653 return tipc_sendstream(sock, m, dsz);
1656 /* tipc_sk_finish_conn - complete the setup of a connection
1658 static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
1661 struct sock *sk = &tsk->sk;
1662 struct net *net = sock_net(sk);
1663 struct tipc_msg *msg = &tsk->phdr;
1665 msg_set_syn(msg, 0);
1666 msg_set_destnode(msg, peer_node);
1667 msg_set_destport(msg, peer_port);
1668 msg_set_type(msg, TIPC_CONN_MSG);
1669 msg_set_lookup_scope(msg, 0);
1670 msg_set_hdr_sz(msg, SHORT_H_SIZE);
1672 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
1673 tipc_set_sk_state(sk, TIPC_ESTABLISHED);
1674 tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
1675 tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid, true);
1676 tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
1678 __skb_queue_purge(&sk->sk_write_queue);
1679 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
1682 /* Fall back to message based flow control */
1683 tsk->rcv_win = FLOWCTL_MSG_WIN;
1684 tsk->snd_win = FLOWCTL_MSG_WIN;
1688 * tipc_sk_set_orig_addr - capture sender's address for received message
1689 * @m: descriptor for message info
1690 * @skb: received message
1692 * Note: Address is not captured if not requested by receiver.
1694 static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
1696 DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
1697 struct tipc_msg *hdr = buf_msg(skb);
1702 srcaddr->sock.family = AF_TIPC;
1703 srcaddr->sock.addrtype = TIPC_SOCKET_ADDR;
1704 srcaddr->sock.scope = 0;
1705 srcaddr->sock.addr.id.ref = msg_origport(hdr);
1706 srcaddr->sock.addr.id.node = msg_orignode(hdr);
1707 srcaddr->sock.addr.name.domain = 0;
1708 m->msg_namelen = sizeof(struct sockaddr_tipc);
1710 if (!msg_in_group(hdr))
1713 /* Group message users may also want to know sending member's id */
1714 srcaddr->member.family = AF_TIPC;
1715 srcaddr->member.addrtype = TIPC_SERVICE_ADDR;
1716 srcaddr->member.scope = 0;
1717 srcaddr->member.addr.name.name.type = msg_nametype(hdr);
1718 srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
1719 srcaddr->member.addr.name.domain = 0;
1720 m->msg_namelen = sizeof(*srcaddr);
1724 * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
1725 * @m: descriptor for message info
1726 * @skb: received message buffer
1727 * @tsk: TIPC port associated with message
1729 * Note: Ancillary data is not captured if not requested by receiver.
1731 * Return: 0 if successful, otherwise errno
1733 static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
1734 struct tipc_sock *tsk)
1736 struct tipc_msg *hdr;
1741 if (likely(m->msg_controllen == 0))
1745 dlen = msg_data_sz(hdr);
1747 /* Capture errored message object, if any */
1748 if (msg_errcode(hdr)) {
1749 if (skb_linearize(skb))
1752 data[0] = msg_errcode(hdr);
1754 rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
1757 rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
1762 /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
1763 switch (msg_type(hdr)) {
1764 case TIPC_NAMED_MSG:
1766 data[0] = msg_nametype(hdr);
1767 data[1] = msg_namelower(hdr);
1770 case TIPC_MCAST_MSG:
1772 data[0] = msg_nametype(hdr);
1773 data[1] = msg_namelower(hdr);
1774 data[2] = msg_nameupper(hdr);
1777 has_addr = !!tsk->conn_addrtype;
1778 data[0] = msg_nametype(&tsk->phdr);
1779 data[1] = msg_nameinst(&tsk->phdr);
1787 return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
1790 static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)
1792 struct sock *sk = &tsk->sk;
1793 struct sk_buff *skb = NULL;
1794 struct tipc_msg *msg;
1795 u32 peer_port = tsk_peer_port(tsk);
1796 u32 dnode = tsk_peer_node(tsk);
1798 if (!tipc_sk_connected(sk))
1800 skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
1801 dnode, tsk_own_node(tsk), peer_port,
1802 tsk->portid, TIPC_OK);
1806 msg_set_conn_ack(msg, tsk->rcv_unacked);
1807 tsk->rcv_unacked = 0;
1809 /* Adjust to and advertize the correct window limit */
1810 if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
1811 tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
1812 msg_set_adv_win(msg, tsk->rcv_win);
1817 static void tipc_sk_send_ack(struct tipc_sock *tsk)
1819 struct sk_buff *skb;
1821 skb = tipc_sk_build_ack(tsk);
1825 tipc_node_xmit_skb(sock_net(&tsk->sk), skb, tsk_peer_node(tsk),
1826 msg_link_selector(buf_msg(skb)));
1829 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
1831 struct sock *sk = sock->sk;
1832 DEFINE_WAIT_FUNC(wait, woken_wake_function);
1833 long timeo = *timeop;
1834 int err = sock_error(sk);
1840 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
1841 if (sk->sk_shutdown & RCV_SHUTDOWN) {
1845 add_wait_queue(sk_sleep(sk), &wait);
1847 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
1848 sched_annotate_sleep();
1850 remove_wait_queue(sk_sleep(sk), &wait);
1853 if (!skb_queue_empty(&sk->sk_receive_queue))
1858 err = sock_intr_errno(timeo);
1859 if (signal_pending(current))
1862 err = sock_error(sk);
1871 * tipc_recvmsg - receive packet-oriented message
1872 * @sock: network socket
1873 * @m: descriptor for message info
1874 * @buflen: length of user buffer area
1875 * @flags: receive flags
1877 * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
1878 * If the complete message doesn't fit in user area, truncate it.
1880 * Return: size of returned message data, errno otherwise
1882 static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
1883 size_t buflen, int flags)
1885 struct sock *sk = sock->sk;
1886 bool connected = !tipc_sk_type_connectionless(sk);
1887 struct tipc_sock *tsk = tipc_sk(sk);
1888 int rc, err, hlen, dlen, copy;
1889 struct sk_buff_head xmitq;
1890 struct tipc_msg *hdr;
1891 struct sk_buff *skb;
1895 /* Catch invalid receive requests */
1896 if (unlikely(!buflen))
1900 if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
1904 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1906 /* Step rcv queue to first msg with data or error; wait if necessary */
1908 rc = tipc_wait_for_rcvmsg(sock, &timeout);
1911 skb = skb_peek(&sk->sk_receive_queue);
1913 dlen = msg_data_sz(hdr);
1914 hlen = msg_hdr_sz(hdr);
1915 err = msg_errcode(hdr);
1916 grp_evt = msg_is_grp_evt(hdr);
1917 if (likely(dlen || err))
1919 tsk_advance_rx_queue(sk);
1922 /* Collect msg meta data, including error code and rejected data */
1923 tipc_sk_set_orig_addr(m, skb);
1924 rc = tipc_sk_anc_data_recv(m, skb, tsk);
1929 /* Capture data if non-error msg, otherwise just set return value */
1931 copy = min_t(int, dlen, buflen);
1932 if (unlikely(copy != dlen))
1933 m->msg_flags |= MSG_TRUNC;
1934 rc = skb_copy_datagram_msg(skb, hlen, m, copy);
1938 if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control)
1944 /* Mark message as group event if applicable */
1945 if (unlikely(grp_evt)) {
1946 if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
1947 m->msg_flags |= MSG_EOR;
1948 m->msg_flags |= MSG_OOB;
1952 /* Caption of data or error code/rejected data was successful */
1953 if (unlikely(flags & MSG_PEEK))
1956 /* Send group flow control advertisement when applicable */
1957 if (tsk->group && msg_in_group(hdr) && !grp_evt) {
1958 __skb_queue_head_init(&xmitq);
1959 tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
1960 msg_orignode(hdr), msg_origport(hdr),
1962 tipc_node_distr_xmit(sock_net(sk), &xmitq);
1965 tsk_advance_rx_queue(sk);
1967 if (likely(!connected))
1970 /* Send connection flow control advertisement when applicable */
1971 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
1972 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
1973 tipc_sk_send_ack(tsk);
1976 return rc ? rc : copy;
1980 * tipc_recvstream - receive stream-oriented data
1981 * @sock: network socket
1982 * @m: descriptor for message info
1983 * @buflen: total size of user buffer area
1984 * @flags: receive flags
1986 * Used for SOCK_STREAM messages only. If not enough data is available
1987 * will optionally wait for more; never truncates data.
1989 * Return: size of returned message data, errno otherwise
1991 static int tipc_recvstream(struct socket *sock, struct msghdr *m,
1992 size_t buflen, int flags)
1994 struct sock *sk = sock->sk;
1995 struct tipc_sock *tsk = tipc_sk(sk);
1996 struct sk_buff *skb;
1997 struct tipc_msg *hdr;
1998 struct tipc_skb_cb *skb_cb;
1999 bool peek = flags & MSG_PEEK;
2000 int offset, required, copy, copied = 0;
2001 int hlen, dlen, err, rc;
2004 /* Catch invalid receive attempts */
2005 if (unlikely(!buflen))
2010 if (unlikely(sk->sk_state == TIPC_OPEN)) {
2014 required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
2015 timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
2018 /* Look at first msg in receive queue; wait if necessary */
2019 rc = tipc_wait_for_rcvmsg(sock, &timeout);
2022 skb = skb_peek(&sk->sk_receive_queue);
2023 skb_cb = TIPC_SKB_CB(skb);
2025 dlen = msg_data_sz(hdr);
2026 hlen = msg_hdr_sz(hdr);
2027 err = msg_errcode(hdr);
2029 /* Discard any empty non-errored (SYN-) message */
2030 if (unlikely(!dlen && !err)) {
2031 tsk_advance_rx_queue(sk);
2035 /* Collect msg meta data, incl. error code and rejected data */
2037 tipc_sk_set_orig_addr(m, skb);
2038 rc = tipc_sk_anc_data_recv(m, skb, tsk);
2044 /* Copy data if msg ok, otherwise return error/partial data */
2046 offset = skb_cb->bytes_read;
2047 copy = min_t(int, dlen - offset, buflen - copied);
2048 rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
2053 if (unlikely(offset < dlen)) {
2055 skb_cb->bytes_read = offset;
2060 if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
2069 tsk_advance_rx_queue(sk);
2071 /* Send connection flow control advertisement when applicable */
2072 tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
2073 if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
2074 tipc_sk_send_ack(tsk);
2076 /* Exit if all requested data or FIN/error received */
2077 if (copied == buflen || err)
2080 } while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
2083 return copied ? copied : rc;
2087 * tipc_write_space - wake up thread if port congestion is released
2090 static void tipc_write_space(struct sock *sk)
2092 struct socket_wq *wq;
2095 wq = rcu_dereference(sk->sk_wq);
2096 if (skwq_has_sleeper(wq))
2097 wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
2098 EPOLLWRNORM | EPOLLWRBAND);
2103 * tipc_data_ready - wake up threads to indicate messages have been received
2106 static void tipc_data_ready(struct sock *sk)
2108 struct socket_wq *wq;
2111 wq = rcu_dereference(sk->sk_wq);
2112 if (skwq_has_sleeper(wq))
2113 wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
2114 EPOLLRDNORM | EPOLLRDBAND);
2118 static void tipc_sock_destruct(struct sock *sk)
2120 __skb_queue_purge(&sk->sk_receive_queue);
2123 static void tipc_sk_proto_rcv(struct sock *sk,
2124 struct sk_buff_head *inputq,
2125 struct sk_buff_head *xmitq)
2127 struct sk_buff *skb = __skb_dequeue(inputq);
2128 struct tipc_sock *tsk = tipc_sk(sk);
2129 struct tipc_msg *hdr = buf_msg(skb);
2130 struct tipc_group *grp = tsk->group;
2131 bool wakeup = false;
2133 switch (msg_user(hdr)) {
2135 tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
2138 tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
2139 /* coupled with smp_rmb() in tipc_wait_for_cond() */
2141 tsk->cong_link_cnt--;
2143 tipc_sk_push_backlog(tsk, false);
2145 case GROUP_PROTOCOL:
2146 tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
2149 tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
2150 hdr, inputq, xmitq);
2157 sk->sk_write_space(sk);
2163 * tipc_sk_filter_connect - check incoming message for a connection-based socket
2165 * @skb: pointer to message buffer.
2166 * @xmitq: for Nagle ACK if any
2167 * Return: true if message should be added to receive queue, false otherwise
2169 static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb,
2170 struct sk_buff_head *xmitq)
2172 struct sock *sk = &tsk->sk;
2173 struct net *net = sock_net(sk);
2174 struct tipc_msg *hdr = buf_msg(skb);
2175 bool con_msg = msg_connected(hdr);
2176 u32 pport = tsk_peer_port(tsk);
2177 u32 pnode = tsk_peer_node(tsk);
2178 u32 oport = msg_origport(hdr);
2179 u32 onode = msg_orignode(hdr);
2180 int err = msg_errcode(hdr);
2181 unsigned long delay;
2183 if (unlikely(msg_mcast(hdr)))
2187 switch (sk->sk_state) {
2188 case TIPC_CONNECTING:
2190 if (likely(con_msg)) {
2193 tipc_sk_finish_conn(tsk, oport, onode);
2194 msg_set_importance(&tsk->phdr, msg_importance(hdr));
2195 /* ACK+ message with data is added to receive queue */
2196 if (msg_data_sz(hdr))
2198 /* Empty ACK-, - wake up sleeping connect() and drop */
2199 sk->sk_state_change(sk);
2200 msg_set_dest_droppable(hdr, 1);
2203 /* Ignore connectionless message if not from listening socket */
2204 if (oport != pport || onode != pnode)
2208 if (err != TIPC_ERR_OVERLOAD)
2211 /* Prepare for new setup attempt if we have a SYN clone */
2212 if (skb_queue_empty(&sk->sk_write_queue))
2214 get_random_bytes(&delay, 2);
2215 delay %= (tsk->conn_timeout / 4);
2216 delay = msecs_to_jiffies(delay + 100);
2217 sk_reset_timer(sk, &sk->sk_timer, jiffies + delay);
2220 case TIPC_DISCONNECTING:
2223 /* Accept only SYN message */
2224 if (!msg_is_syn(hdr) &&
2225 tipc_node_get_capabilities(net, onode) & TIPC_SYN_BIT)
2227 if (!con_msg && !err)
2230 case TIPC_ESTABLISHED:
2231 if (!skb_queue_empty(&sk->sk_write_queue))
2232 tipc_sk_push_backlog(tsk, false);
2233 /* Accept only connection-based messages sent by peer */
2234 if (likely(con_msg && !err && pport == oport &&
2236 if (msg_ack_required(hdr)) {
2237 struct sk_buff *skb;
2239 skb = tipc_sk_build_ack(tsk);
2241 msg_set_nagle_ack(buf_msg(skb));
2242 __skb_queue_tail(xmitq, skb);
2247 if (!tsk_peer_msg(tsk, hdr))
2251 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2252 tipc_node_remove_conn(net, pnode, tsk->portid);
2253 sk->sk_state_change(sk);
2256 pr_err("Unknown sk_state %u\n", sk->sk_state);
2258 /* Abort connection setup attempt */
2259 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2260 sk->sk_err = ECONNREFUSED;
2261 sk->sk_state_change(sk);
2266 * rcvbuf_limit - get proper overload limit of socket receive queue
2270 * For connection oriented messages, irrespective of importance,
2271 * default queue limit is 2 MB.
2273 * For connectionless messages, queue limits are based on message
2274 * importance as follows:
2276 * TIPC_LOW_IMPORTANCE (2 MB)
2277 * TIPC_MEDIUM_IMPORTANCE (4 MB)
2278 * TIPC_HIGH_IMPORTANCE (8 MB)
2279 * TIPC_CRITICAL_IMPORTANCE (16 MB)
2281 * Return: overload limit according to corresponding message importance
2283 static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
2285 struct tipc_sock *tsk = tipc_sk(sk);
2286 struct tipc_msg *hdr = buf_msg(skb);
2288 if (unlikely(msg_in_group(hdr)))
2289 return READ_ONCE(sk->sk_rcvbuf);
2291 if (unlikely(!msg_connected(hdr)))
2292 return READ_ONCE(sk->sk_rcvbuf) << msg_importance(hdr);
2294 if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
2295 return READ_ONCE(sk->sk_rcvbuf);
2297 return FLOWCTL_MSG_LIM;
2301 * tipc_sk_filter_rcv - validate incoming message
2303 * @skb: pointer to message.
2304 * @xmitq: output message area (FIXME)
2306 * Enqueues message on receive queue if acceptable; optionally handles
2307 * disconnect indication for a connected socket.
2309 * Called with socket lock already taken
2311 static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
2312 struct sk_buff_head *xmitq)
2314 bool sk_conn = !tipc_sk_type_connectionless(sk);
2315 struct tipc_sock *tsk = tipc_sk(sk);
2316 struct tipc_group *grp = tsk->group;
2317 struct tipc_msg *hdr = buf_msg(skb);
2318 struct net *net = sock_net(sk);
2319 struct sk_buff_head inputq;
2320 int mtyp = msg_type(hdr);
2321 int limit, err = TIPC_OK;
2323 trace_tipc_sk_filter_rcv(sk, skb, TIPC_DUMP_ALL, " ");
2324 TIPC_SKB_CB(skb)->bytes_read = 0;
2325 __skb_queue_head_init(&inputq);
2326 __skb_queue_tail(&inputq, skb);
2328 if (unlikely(!msg_isdata(hdr)))
2329 tipc_sk_proto_rcv(sk, &inputq, xmitq);
2332 tipc_group_filter_msg(grp, &inputq, xmitq);
2334 if (unlikely(!grp) && mtyp == TIPC_MCAST_MSG)
2335 tipc_mcast_filter_msg(net, &tsk->mc_method.deferredq, &inputq);
2337 /* Validate and add to receive buffer if there is space */
2338 while ((skb = __skb_dequeue(&inputq))) {
2340 limit = rcvbuf_limit(sk, skb);
2341 if ((sk_conn && !tipc_sk_filter_connect(tsk, skb, xmitq)) ||
2342 (!sk_conn && msg_connected(hdr)) ||
2343 (!grp && msg_in_group(hdr)))
2344 err = TIPC_ERR_NO_PORT;
2345 else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
2346 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL,
2348 atomic_inc(&sk->sk_drops);
2349 err = TIPC_ERR_OVERLOAD;
2352 if (unlikely(err)) {
2353 if (tipc_msg_reverse(tipc_own_addr(net), &skb, err)) {
2354 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_NONE,
2356 __skb_queue_tail(xmitq, skb);
2361 __skb_queue_tail(&sk->sk_receive_queue, skb);
2362 skb_set_owner_r(skb, sk);
2363 trace_tipc_sk_overlimit2(sk, skb, TIPC_DUMP_ALL,
2364 "rcvq >90% allocated!");
2365 sk->sk_data_ready(sk);
2370 * tipc_sk_backlog_rcv - handle incoming message from backlog queue
2374 * Caller must hold socket lock
2376 static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
2378 unsigned int before = sk_rmem_alloc_get(sk);
2379 struct sk_buff_head xmitq;
2382 __skb_queue_head_init(&xmitq);
2384 tipc_sk_filter_rcv(sk, skb, &xmitq);
2385 added = sk_rmem_alloc_get(sk) - before;
2386 atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
2388 /* Send pending response/rejected messages, if any */
2389 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2394 * tipc_sk_enqueue - extract all buffers with destination 'dport' from
2395 * inputq and try adding them to socket or backlog queue
2396 * @inputq: list of incoming buffers with potentially different destinations
2397 * @sk: socket where the buffers should be enqueued
2398 * @dport: port number for the socket
2399 * @xmitq: output queue
2401 * Caller must hold socket lock
2403 static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
2404 u32 dport, struct sk_buff_head *xmitq)
2406 unsigned long time_limit = jiffies + 2;
2407 struct sk_buff *skb;
2412 while (skb_queue_len(inputq)) {
2413 if (unlikely(time_after_eq(jiffies, time_limit)))
2416 skb = tipc_skb_dequeue(inputq, dport);
2420 /* Add message directly to receive queue if possible */
2421 if (!sock_owned_by_user(sk)) {
2422 tipc_sk_filter_rcv(sk, skb, xmitq);
2426 /* Try backlog, compensating for double-counted bytes */
2427 dcnt = &tipc_sk(sk)->dupl_rcvcnt;
2428 if (!sk->sk_backlog.len)
2429 atomic_set(dcnt, 0);
2430 lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
2431 if (likely(!sk_add_backlog(sk, skb, lim))) {
2432 trace_tipc_sk_overlimit1(sk, skb, TIPC_DUMP_ALL,
2433 "bklg & rcvq >90% allocated!");
2437 trace_tipc_sk_dump(sk, skb, TIPC_DUMP_ALL, "err_overload!");
2438 /* Overload => reject message back to sender */
2439 onode = tipc_own_addr(sock_net(sk));
2440 atomic_inc(&sk->sk_drops);
2441 if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD)) {
2442 trace_tipc_sk_rej_msg(sk, skb, TIPC_DUMP_ALL,
2444 __skb_queue_tail(xmitq, skb);
2451 * tipc_sk_rcv - handle a chain of incoming buffers
2452 * @net: the associated network namespace
2453 * @inputq: buffer list containing the buffers
2454 * Consumes all buffers in list until inputq is empty
2455 * Note: may be called in multiple threads referring to the same queue
2457 void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
2459 struct sk_buff_head xmitq;
2460 u32 dnode, dport = 0;
2462 struct tipc_sock *tsk;
2464 struct sk_buff *skb;
2466 __skb_queue_head_init(&xmitq);
2467 while (skb_queue_len(inputq)) {
2468 dport = tipc_skb_peek_port(inputq, dport);
2469 tsk = tipc_sk_lookup(net, dport);
2473 if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
2474 tipc_sk_enqueue(inputq, sk, dport, &xmitq);
2475 spin_unlock_bh(&sk->sk_lock.slock);
2477 /* Send pending response/rejected messages, if any */
2478 tipc_node_distr_xmit(sock_net(sk), &xmitq);
2482 /* No destination socket => dequeue skb if still there */
2483 skb = tipc_skb_dequeue(inputq, dport);
2487 /* Try secondary lookup if unresolved named message */
2488 err = TIPC_ERR_NO_PORT;
2489 if (tipc_msg_lookup_dest(net, skb, &err))
2492 /* Prepare for message rejection */
2493 if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
2496 trace_tipc_sk_rej_msg(NULL, skb, TIPC_DUMP_NONE, "@sk_rcv!");
2498 dnode = msg_destnode(buf_msg(skb));
2499 tipc_node_xmit_skb(net, skb, dnode, dport);
2503 static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
2505 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2506 struct sock *sk = sock->sk;
2510 int err = sock_error(sk);
2515 if (signal_pending(current))
2516 return sock_intr_errno(*timeo_p);
2517 if (sk->sk_state == TIPC_DISCONNECTING)
2520 add_wait_queue(sk_sleep(sk), &wait);
2521 done = sk_wait_event(sk, timeo_p, tipc_sk_connected(sk),
2523 remove_wait_queue(sk_sleep(sk), &wait);
2528 static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
2530 if (addr->family != AF_TIPC)
2532 if (addr->addrtype == TIPC_SERVICE_RANGE)
2533 return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
2534 return (addr->addrtype == TIPC_SERVICE_ADDR ||
2535 addr->addrtype == TIPC_SOCKET_ADDR);
2539 * tipc_connect - establish a connection to another TIPC port
2540 * @sock: socket structure
2541 * @dest: socket address for destination port
2542 * @destlen: size of socket address data structure
2543 * @flags: file-related flags associated with socket
2545 * Return: 0 on success, errno otherwise
2547 static int tipc_connect(struct socket *sock, struct sockaddr *dest,
2548 int destlen, int flags)
2550 struct sock *sk = sock->sk;
2551 struct tipc_sock *tsk = tipc_sk(sk);
2552 struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
2553 struct msghdr m = {NULL,};
2554 long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
2558 if (destlen != sizeof(struct sockaddr_tipc))
2568 if (dst->family == AF_UNSPEC) {
2569 memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
2570 if (!tipc_sk_type_connectionless(sk))
2574 if (!tipc_sockaddr_is_sane(dst)) {
2578 /* DGRAM/RDM connect(), just save the destaddr */
2579 if (tipc_sk_type_connectionless(sk)) {
2580 memcpy(&tsk->peer, dest, destlen);
2582 } else if (dst->addrtype == TIPC_SERVICE_RANGE) {
2587 previous = sk->sk_state;
2589 switch (sk->sk_state) {
2591 /* Send a 'SYN-' to destination */
2593 m.msg_namelen = destlen;
2595 /* If connect is in non-blocking case, set MSG_DONTWAIT to
2596 * indicate send_msg() is never blocked.
2599 m.msg_flags = MSG_DONTWAIT;
2601 res = __tipc_sendmsg(sock, &m, 0);
2602 if ((res < 0) && (res != -EWOULDBLOCK))
2605 /* Just entered TIPC_CONNECTING state; the only
2606 * difference is that return value in non-blocking
2607 * case is EINPROGRESS, rather than EALREADY.
2611 case TIPC_CONNECTING:
2613 if (previous == TIPC_CONNECTING)
2617 timeout = msecs_to_jiffies(timeout);
2618 /* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
2619 res = tipc_wait_for_connect(sock, &timeout);
2621 case TIPC_ESTABLISHED:
2634 * tipc_listen - allow socket to listen for incoming connections
2635 * @sock: socket structure
2638 * Return: 0 on success, errno otherwise
2640 static int tipc_listen(struct socket *sock, int len)
2642 struct sock *sk = sock->sk;
2646 res = tipc_set_sk_state(sk, TIPC_LISTEN);
2652 static int tipc_wait_for_accept(struct socket *sock, long timeo)
2654 struct sock *sk = sock->sk;
2655 DEFINE_WAIT_FUNC(wait, woken_wake_function);
2658 /* True wake-one mechanism for incoming connections: only
2659 * one process gets woken up, not the 'whole herd'.
2660 * Since we do not 'race & poll' for established sockets
2661 * anymore, the common case will execute the loop only once.
2664 if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
2665 add_wait_queue(sk_sleep(sk), &wait);
2667 timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
2669 remove_wait_queue(sk_sleep(sk), &wait);
2672 if (!skb_queue_empty(&sk->sk_receive_queue))
2677 err = sock_intr_errno(timeo);
2678 if (signal_pending(current))
2685 * tipc_accept - wait for connection request
2686 * @sock: listening socket
2687 * @new_sock: new socket that is to be connected
2688 * @flags: file-related flags associated with socket
2689 * @kern: caused by kernel or by userspace?
2691 * Return: 0 on success, errno otherwise
2693 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
2696 struct sock *new_sk, *sk = sock->sk;
2697 struct tipc_sock *new_tsock;
2698 struct msghdr m = {NULL,};
2699 struct tipc_msg *msg;
2700 struct sk_buff *buf;
2706 if (sk->sk_state != TIPC_LISTEN) {
2710 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
2711 res = tipc_wait_for_accept(sock, timeo);
2715 buf = skb_peek(&sk->sk_receive_queue);
2717 res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
2720 security_sk_clone(sock->sk, new_sock->sk);
2722 new_sk = new_sock->sk;
2723 new_tsock = tipc_sk(new_sk);
2726 /* we lock on new_sk; but lockdep sees the lock on sk */
2727 lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
2730 * Reject any stray messages received by new socket
2731 * before the socket lock was taken (very, very unlikely)
2733 tsk_rej_rx_queue(new_sk, TIPC_ERR_NO_PORT);
2735 /* Connect new socket to it's peer */
2736 tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
2738 tsk_set_importance(new_sk, msg_importance(msg));
2739 if (msg_named(msg)) {
2740 new_tsock->conn_addrtype = TIPC_SERVICE_ADDR;
2741 msg_set_nametype(&new_tsock->phdr, msg_nametype(msg));
2742 msg_set_nameinst(&new_tsock->phdr, msg_nameinst(msg));
2746 * Respond to 'SYN-' by discarding it & returning 'ACK'.
2747 * Respond to 'SYN+' by queuing it on new socket & returning 'ACK'.
2749 if (!msg_data_sz(msg)) {
2750 tsk_advance_rx_queue(sk);
2752 __skb_dequeue(&sk->sk_receive_queue);
2753 __skb_queue_head(&new_sk->sk_receive_queue, buf);
2754 skb_set_owner_r(buf, new_sk);
2756 __tipc_sendstream(new_sock, &m, 0);
2757 release_sock(new_sk);
2764 * tipc_shutdown - shutdown socket connection
2765 * @sock: socket structure
2766 * @how: direction to close (must be SHUT_RDWR)
2768 * Terminates connection (if necessary), then purges socket's receive queue.
2770 * Return: 0 on success, errno otherwise
2772 static int tipc_shutdown(struct socket *sock, int how)
2774 struct sock *sk = sock->sk;
2777 if (how != SHUT_RDWR)
2782 trace_tipc_sk_shutdown(sk, NULL, TIPC_DUMP_ALL, " ");
2783 __tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
2784 sk->sk_shutdown = SHUTDOWN_MASK;
2786 if (sk->sk_state == TIPC_DISCONNECTING) {
2787 /* Discard any unreceived messages */
2788 __skb_queue_purge(&sk->sk_receive_queue);
2794 /* Wake up anyone sleeping in poll. */
2795 sk->sk_state_change(sk);
2801 static void tipc_sk_check_probing_state(struct sock *sk,
2802 struct sk_buff_head *list)
2804 struct tipc_sock *tsk = tipc_sk(sk);
2805 u32 pnode = tsk_peer_node(tsk);
2806 u32 pport = tsk_peer_port(tsk);
2807 u32 self = tsk_own_node(tsk);
2808 u32 oport = tsk->portid;
2809 struct sk_buff *skb;
2811 if (tsk->probe_unacked) {
2812 tipc_set_sk_state(sk, TIPC_DISCONNECTING);
2813 sk->sk_err = ECONNABORTED;
2814 tipc_node_remove_conn(sock_net(sk), pnode, pport);
2815 sk->sk_state_change(sk);
2818 /* Prepare new probe */
2819 skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
2820 pnode, self, pport, oport, TIPC_OK);
2822 __skb_queue_tail(list, skb);
2823 tsk->probe_unacked = true;
2824 sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
2827 static void tipc_sk_retry_connect(struct sock *sk, struct sk_buff_head *list)
2829 struct tipc_sock *tsk = tipc_sk(sk);
2831 /* Try again later if dest link is congested */
2832 if (tsk->cong_link_cnt) {
2833 sk_reset_timer(sk, &sk->sk_timer, msecs_to_jiffies(100));
2836 /* Prepare SYN for retransmit */
2837 tipc_msg_skb_clone(&sk->sk_write_queue, list);
2840 static void tipc_sk_timeout(struct timer_list *t)
2842 struct sock *sk = from_timer(sk, t, sk_timer);
2843 struct tipc_sock *tsk = tipc_sk(sk);
2844 u32 pnode = tsk_peer_node(tsk);
2845 struct sk_buff_head list;
2848 __skb_queue_head_init(&list);
2851 /* Try again later if socket is busy */
2852 if (sock_owned_by_user(sk)) {
2853 sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
2859 if (sk->sk_state == TIPC_ESTABLISHED)
2860 tipc_sk_check_probing_state(sk, &list);
2861 else if (sk->sk_state == TIPC_CONNECTING)
2862 tipc_sk_retry_connect(sk, &list);
2866 if (!skb_queue_empty(&list))
2867 rc = tipc_node_xmit(sock_net(sk), &list, pnode, tsk->portid);
2869 /* SYN messages may cause link congestion */
2870 if (rc == -ELINKCONG) {
2871 tipc_dest_push(&tsk->cong_links, pnode, 0);
2872 tsk->cong_link_cnt = 1;
2877 static int tipc_sk_publish(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2879 struct sock *sk = &tsk->sk;
2880 struct net *net = sock_net(sk);
2881 struct tipc_socket_addr skaddr;
2882 struct publication *p;
2885 if (tipc_sk_connected(sk))
2887 key = tsk->portid + tsk->pub_count + 1;
2888 if (key == tsk->portid)
2890 skaddr.ref = tsk->portid;
2891 skaddr.node = tipc_own_addr(net);
2892 p = tipc_nametbl_publish(net, ua, &skaddr, key);
2896 list_add(&p->binding_sock, &tsk->publications);
2898 tsk->published = true;
2902 static int tipc_sk_withdraw(struct tipc_sock *tsk, struct tipc_uaddr *ua)
2904 struct net *net = sock_net(&tsk->sk);
2905 struct publication *safe, *p;
2906 struct tipc_uaddr _ua;
2909 list_for_each_entry_safe(p, safe, &tsk->publications, binding_sock) {
2911 tipc_uaddr(&_ua, TIPC_SERVICE_RANGE, p->scope,
2912 p->sr.type, p->sr.lower, p->sr.upper);
2913 tipc_nametbl_withdraw(net, &_ua, &p->sk, p->key);
2916 /* Unbind specific publication */
2917 if (p->scope != ua->scope)
2919 if (p->sr.type != ua->sr.type)
2921 if (p->sr.lower != ua->sr.lower)
2923 if (p->sr.upper != ua->sr.upper)
2925 tipc_nametbl_withdraw(net, ua, &p->sk, p->key);
2929 if (list_empty(&tsk->publications)) {
2936 /* tipc_sk_reinit: set non-zero address in all existing sockets
2937 * when we go from standalone to network mode.
2939 void tipc_sk_reinit(struct net *net)
2941 struct tipc_net *tn = net_generic(net, tipc_net_id);
2942 struct rhashtable_iter iter;
2943 struct tipc_sock *tsk;
2944 struct tipc_msg *msg;
2946 rhashtable_walk_enter(&tn->sk_rht, &iter);
2949 rhashtable_walk_start(&iter);
2951 while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
2952 sock_hold(&tsk->sk);
2953 rhashtable_walk_stop(&iter);
2954 lock_sock(&tsk->sk);
2956 msg_set_prevnode(msg, tipc_own_addr(net));
2957 msg_set_orignode(msg, tipc_own_addr(net));
2958 release_sock(&tsk->sk);
2959 rhashtable_walk_start(&iter);
2963 rhashtable_walk_stop(&iter);
2964 } while (tsk == ERR_PTR(-EAGAIN));
2966 rhashtable_walk_exit(&iter);
2969 static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
2971 struct tipc_net *tn = net_generic(net, tipc_net_id);
2972 struct tipc_sock *tsk;
2975 tsk = rhashtable_lookup(&tn->sk_rht, &portid, tsk_rht_params);
2977 sock_hold(&tsk->sk);
2983 static int tipc_sk_insert(struct tipc_sock *tsk)
2985 struct sock *sk = &tsk->sk;
2986 struct net *net = sock_net(sk);
2987 struct tipc_net *tn = net_generic(net, tipc_net_id);
2988 u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
2989 u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
2991 while (remaining--) {
2993 if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
2994 portid = TIPC_MIN_PORT;
2995 tsk->portid = portid;
2996 sock_hold(&tsk->sk);
2997 if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
3006 static void tipc_sk_remove(struct tipc_sock *tsk)
3008 struct sock *sk = &tsk->sk;
3009 struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
3011 if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
3012 WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
3017 static const struct rhashtable_params tsk_rht_params = {
3019 .head_offset = offsetof(struct tipc_sock, node),
3020 .key_offset = offsetof(struct tipc_sock, portid),
3021 .key_len = sizeof(u32), /* portid */
3022 .max_size = 1048576,
3024 .automatic_shrinking = true,
3027 int tipc_sk_rht_init(struct net *net)
3029 struct tipc_net *tn = net_generic(net, tipc_net_id);
3031 return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
3034 void tipc_sk_rht_destroy(struct net *net)
3036 struct tipc_net *tn = net_generic(net, tipc_net_id);
3038 /* Wait for socket readers to complete */
3041 rhashtable_destroy(&tn->sk_rht);
3044 static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
3046 struct net *net = sock_net(&tsk->sk);
3047 struct tipc_group *grp = tsk->group;
3048 struct tipc_msg *hdr = &tsk->phdr;
3049 struct tipc_uaddr ua;
3052 if (mreq->type < TIPC_RESERVED_TYPES)
3054 if (mreq->scope > TIPC_NODE_SCOPE)
3056 if (mreq->scope != TIPC_NODE_SCOPE)
3057 mreq->scope = TIPC_CLUSTER_SCOPE;
3060 grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
3064 msg_set_lookup_scope(hdr, mreq->scope);
3065 msg_set_nametype(hdr, mreq->type);
3066 msg_set_dest_droppable(hdr, true);
3067 tipc_uaddr(&ua, TIPC_SERVICE_RANGE, mreq->scope,
3068 mreq->type, mreq->instance, mreq->instance);
3069 tipc_nametbl_build_group(net, grp, &ua);
3070 rc = tipc_sk_publish(tsk, &ua);
3072 tipc_group_delete(net, grp);
3076 /* Eliminate any risk that a broadcast overtakes sent JOINs */
3077 tsk->mc_method.rcast = true;
3078 tsk->mc_method.mandatory = true;
3079 tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
3083 static int tipc_sk_leave(struct tipc_sock *tsk)
3085 struct net *net = sock_net(&tsk->sk);
3086 struct tipc_group *grp = tsk->group;
3087 struct tipc_uaddr ua;
3092 ua.addrtype = TIPC_SERVICE_RANGE;
3093 tipc_group_self(grp, &ua.sr, &scope);
3095 tipc_group_delete(net, grp);
3097 tipc_sk_withdraw(tsk, &ua);
3102 * tipc_setsockopt - set socket option
3103 * @sock: socket structure
3104 * @lvl: option level
3105 * @opt: option identifier
3106 * @ov: pointer to new option value
3107 * @ol: length of option value
3109 * For stream sockets only, accepts and ignores all IPPROTO_TCP options
3110 * (to ease compatibility).
3112 * Return: 0 on success, errno otherwise
3114 static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
3115 sockptr_t ov, unsigned int ol)
3117 struct sock *sk = sock->sk;
3118 struct tipc_sock *tsk = tipc_sk(sk);
3119 struct tipc_group_req mreq;
3123 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3125 if (lvl != SOL_TIPC)
3126 return -ENOPROTOOPT;
3129 case TIPC_IMPORTANCE:
3130 case TIPC_SRC_DROPPABLE:
3131 case TIPC_DEST_DROPPABLE:
3132 case TIPC_CONN_TIMEOUT:
3134 if (ol < sizeof(value))
3136 if (copy_from_sockptr(&value, ov, sizeof(u32)))
3139 case TIPC_GROUP_JOIN:
3140 if (ol < sizeof(mreq))
3142 if (copy_from_sockptr(&mreq, ov, sizeof(mreq)))
3146 if (!sockptr_is_null(ov) || ol)
3153 case TIPC_IMPORTANCE:
3154 res = tsk_set_importance(sk, value);
3156 case TIPC_SRC_DROPPABLE:
3157 if (sock->type != SOCK_STREAM)
3158 tsk_set_unreliable(tsk, value);
3162 case TIPC_DEST_DROPPABLE:
3163 tsk_set_unreturnable(tsk, value);
3165 case TIPC_CONN_TIMEOUT:
3166 tipc_sk(sk)->conn_timeout = value;
3168 case TIPC_MCAST_BROADCAST:
3169 tsk->mc_method.rcast = false;
3170 tsk->mc_method.mandatory = true;
3172 case TIPC_MCAST_REPLICAST:
3173 tsk->mc_method.rcast = true;
3174 tsk->mc_method.mandatory = true;
3176 case TIPC_GROUP_JOIN:
3177 res = tipc_sk_join(tsk, &mreq);
3179 case TIPC_GROUP_LEAVE:
3180 res = tipc_sk_leave(tsk);
3183 tsk->nodelay = !!value;
3196 * tipc_getsockopt - get socket option
3197 * @sock: socket structure
3198 * @lvl: option level
3199 * @opt: option identifier
3200 * @ov: receptacle for option value
3201 * @ol: receptacle for length of option value
3203 * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
3204 * (to ease compatibility).
3206 * Return: 0 on success, errno otherwise
3208 static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
3209 char __user *ov, int __user *ol)
3211 struct sock *sk = sock->sk;
3212 struct tipc_sock *tsk = tipc_sk(sk);
3213 struct tipc_service_range seq;
3218 if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
3219 return put_user(0, ol);
3220 if (lvl != SOL_TIPC)
3221 return -ENOPROTOOPT;
3222 res = get_user(len, ol);
3229 case TIPC_IMPORTANCE:
3230 value = tsk_importance(tsk);
3232 case TIPC_SRC_DROPPABLE:
3233 value = tsk_unreliable(tsk);
3235 case TIPC_DEST_DROPPABLE:
3236 value = tsk_unreturnable(tsk);
3238 case TIPC_CONN_TIMEOUT:
3239 value = tsk->conn_timeout;
3240 /* no need to set "res", since already 0 at this point */
3242 case TIPC_NODE_RECVQ_DEPTH:
3243 value = 0; /* was tipc_queue_size, now obsolete */
3245 case TIPC_SOCK_RECVQ_DEPTH:
3246 value = skb_queue_len(&sk->sk_receive_queue);
3248 case TIPC_SOCK_RECVQ_USED:
3249 value = sk_rmem_alloc_get(sk);
3251 case TIPC_GROUP_JOIN:
3254 tipc_group_self(tsk->group, &seq, &scope);
3264 return res; /* "get" failed */
3266 if (len < sizeof(value))
3269 if (copy_to_user(ov, &value, sizeof(value)))
3272 return put_user(sizeof(value), ol);
3275 static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
3277 struct net *net = sock_net(sock->sk);
3278 struct tipc_sioc_nodeid_req nr = {0};
3279 struct tipc_sioc_ln_req lnr;
3280 void __user *argp = (void __user *)arg;
3283 case SIOCGETLINKNAME:
3284 if (copy_from_user(&lnr, argp, sizeof(lnr)))
3286 if (!tipc_node_get_linkname(net,
3287 lnr.bearer_id & 0xffff, lnr.peer,
3288 lnr.linkname, TIPC_MAX_LINK_NAME)) {
3289 if (copy_to_user(argp, &lnr, sizeof(lnr)))
3293 return -EADDRNOTAVAIL;
3295 if (copy_from_user(&nr, argp, sizeof(nr)))
3297 if (!tipc_node_get_id(net, nr.peer, nr.node_id))
3298 return -EADDRNOTAVAIL;
3299 if (copy_to_user(argp, &nr, sizeof(nr)))
3303 return -ENOIOCTLCMD;
3307 static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
3309 struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
3310 struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
3311 u32 onode = tipc_own_addr(sock_net(sock1->sk));
3313 tsk1->peer.family = AF_TIPC;
3314 tsk1->peer.addrtype = TIPC_SOCKET_ADDR;
3315 tsk1->peer.scope = TIPC_NODE_SCOPE;
3316 tsk1->peer.addr.id.ref = tsk2->portid;
3317 tsk1->peer.addr.id.node = onode;
3318 tsk2->peer.family = AF_TIPC;
3319 tsk2->peer.addrtype = TIPC_SOCKET_ADDR;
3320 tsk2->peer.scope = TIPC_NODE_SCOPE;
3321 tsk2->peer.addr.id.ref = tsk1->portid;
3322 tsk2->peer.addr.id.node = onode;
3324 tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
3325 tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
3329 /* Protocol switches for the various types of TIPC sockets */
3331 static const struct proto_ops msg_ops = {
3332 .owner = THIS_MODULE,
3334 .release = tipc_release,
3336 .connect = tipc_connect,
3337 .socketpair = tipc_socketpair,
3338 .accept = sock_no_accept,
3339 .getname = tipc_getname,
3341 .ioctl = tipc_ioctl,
3342 .listen = sock_no_listen,
3343 .shutdown = tipc_shutdown,
3344 .setsockopt = tipc_setsockopt,
3345 .getsockopt = tipc_getsockopt,
3346 .sendmsg = tipc_sendmsg,
3347 .recvmsg = tipc_recvmsg,
3348 .mmap = sock_no_mmap,
3349 .sendpage = sock_no_sendpage
3352 static const struct proto_ops packet_ops = {
3353 .owner = THIS_MODULE,
3355 .release = tipc_release,
3357 .connect = tipc_connect,
3358 .socketpair = tipc_socketpair,
3359 .accept = tipc_accept,
3360 .getname = tipc_getname,
3362 .ioctl = tipc_ioctl,
3363 .listen = tipc_listen,
3364 .shutdown = tipc_shutdown,
3365 .setsockopt = tipc_setsockopt,
3366 .getsockopt = tipc_getsockopt,
3367 .sendmsg = tipc_send_packet,
3368 .recvmsg = tipc_recvmsg,
3369 .mmap = sock_no_mmap,
3370 .sendpage = sock_no_sendpage
3373 static const struct proto_ops stream_ops = {
3374 .owner = THIS_MODULE,
3376 .release = tipc_release,
3378 .connect = tipc_connect,
3379 .socketpair = tipc_socketpair,
3380 .accept = tipc_accept,
3381 .getname = tipc_getname,
3383 .ioctl = tipc_ioctl,
3384 .listen = tipc_listen,
3385 .shutdown = tipc_shutdown,
3386 .setsockopt = tipc_setsockopt,
3387 .getsockopt = tipc_getsockopt,
3388 .sendmsg = tipc_sendstream,
3389 .recvmsg = tipc_recvstream,
3390 .mmap = sock_no_mmap,
3391 .sendpage = sock_no_sendpage
3394 static const struct net_proto_family tipc_family_ops = {
3395 .owner = THIS_MODULE,
3397 .create = tipc_sk_create
3400 static struct proto tipc_proto = {
3402 .owner = THIS_MODULE,
3403 .obj_size = sizeof(struct tipc_sock),
3404 .sysctl_rmem = sysctl_tipc_rmem
3408 * tipc_socket_init - initialize TIPC socket interface
3410 * Return: 0 on success, errno otherwise
3412 int tipc_socket_init(void)
3416 res = proto_register(&tipc_proto, 1);
3418 pr_err("Failed to register TIPC protocol type\n");
3422 res = sock_register(&tipc_family_ops);
3424 pr_err("Failed to register TIPC socket type\n");
3425 proto_unregister(&tipc_proto);
3433 * tipc_socket_stop - stop TIPC socket interface
3435 void tipc_socket_stop(void)
3437 sock_unregister(tipc_family_ops.family);
3438 proto_unregister(&tipc_proto);
3441 /* Caller should hold socket lock for the passed tipc socket. */
3442 static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
3444 u32 peer_node, peer_port;
3445 u32 conn_type, conn_instance;
3446 struct nlattr *nest;
3448 peer_node = tsk_peer_node(tsk);
3449 peer_port = tsk_peer_port(tsk);
3450 conn_type = msg_nametype(&tsk->phdr);
3451 conn_instance = msg_nameinst(&tsk->phdr);
3452 nest = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_CON);
3456 if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
3458 if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
3461 if (tsk->conn_addrtype != 0) {
3462 if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
3464 if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, conn_type))
3466 if (nla_put_u32(skb, TIPC_NLA_CON_INST, conn_instance))
3469 nla_nest_end(skb, nest);
3474 nla_nest_cancel(skb, nest);
3479 static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
3482 struct net *net = sock_net(skb->sk);
3483 struct sock *sk = &tsk->sk;
3485 if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
3486 nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
3489 if (tipc_sk_connected(sk)) {
3490 if (__tipc_nl_add_sk_con(skb, tsk))
3492 } else if (!list_empty(&tsk->publications)) {
3493 if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
3499 /* Caller should hold socket lock for the passed tipc socket. */
3500 static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
3501 struct tipc_sock *tsk)
3503 struct nlattr *attrs;
3506 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3507 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
3511 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3513 goto genlmsg_cancel;
3515 if (__tipc_nl_add_sk_info(skb, tsk))
3516 goto attr_msg_cancel;
3518 nla_nest_end(skb, attrs);
3519 genlmsg_end(skb, hdr);
3524 nla_nest_cancel(skb, attrs);
3526 genlmsg_cancel(skb, hdr);
3531 int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
3532 int (*skb_handler)(struct sk_buff *skb,
3533 struct netlink_callback *cb,
3534 struct tipc_sock *tsk))
3536 struct rhashtable_iter *iter = (void *)cb->args[4];
3537 struct tipc_sock *tsk;
3540 rhashtable_walk_start(iter);
3541 while ((tsk = rhashtable_walk_next(iter)) != NULL) {
3544 if (err == -EAGAIN) {
3551 sock_hold(&tsk->sk);
3552 rhashtable_walk_stop(iter);
3553 lock_sock(&tsk->sk);
3554 err = skb_handler(skb, cb, tsk);
3556 release_sock(&tsk->sk);
3560 release_sock(&tsk->sk);
3561 rhashtable_walk_start(iter);
3564 rhashtable_walk_stop(iter);
3568 EXPORT_SYMBOL(tipc_nl_sk_walk);
3570 int tipc_dump_start(struct netlink_callback *cb)
3572 return __tipc_dump_start(cb, sock_net(cb->skb->sk));
3574 EXPORT_SYMBOL(tipc_dump_start);
3576 int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
3578 /* tipc_nl_name_table_dump() uses cb->args[0...3]. */
3579 struct rhashtable_iter *iter = (void *)cb->args[4];
3580 struct tipc_net *tn = tipc_net(net);
3583 iter = kmalloc(sizeof(*iter), GFP_KERNEL);
3587 cb->args[4] = (long)iter;
3590 rhashtable_walk_enter(&tn->sk_rht, iter);
3594 int tipc_dump_done(struct netlink_callback *cb)
3596 struct rhashtable_iter *hti = (void *)cb->args[4];
3598 rhashtable_walk_exit(hti);
3602 EXPORT_SYMBOL(tipc_dump_done);
3604 int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
3605 struct tipc_sock *tsk, u32 sk_filter_state,
3606 u64 (*tipc_diag_gen_cookie)(struct sock *sk))
3608 struct sock *sk = &tsk->sk;
3609 struct nlattr *attrs;
3610 struct nlattr *stat;
3612 /*filter response w.r.t sk_state*/
3613 if (!(sk_filter_state & (1 << sk->sk_state)))
3616 attrs = nla_nest_start_noflag(skb, TIPC_NLA_SOCK);
3620 if (__tipc_nl_add_sk_info(skb, tsk))
3621 goto attr_msg_cancel;
3623 if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
3624 nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
3625 nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
3626 nla_put_u32(skb, TIPC_NLA_SOCK_UID,
3627 from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
3629 nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
3630 tipc_diag_gen_cookie(sk),
3632 goto attr_msg_cancel;
3634 stat = nla_nest_start_noflag(skb, TIPC_NLA_SOCK_STAT);
3636 goto attr_msg_cancel;
3638 if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
3639 skb_queue_len(&sk->sk_receive_queue)) ||
3640 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
3641 skb_queue_len(&sk->sk_write_queue)) ||
3642 nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
3643 atomic_read(&sk->sk_drops)))
3644 goto stat_msg_cancel;
3646 if (tsk->cong_link_cnt &&
3647 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
3648 goto stat_msg_cancel;
3650 if (tsk_conn_cong(tsk) &&
3651 nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
3652 goto stat_msg_cancel;
3654 nla_nest_end(skb, stat);
3657 if (tipc_group_fill_sock_diag(tsk->group, skb))
3658 goto stat_msg_cancel;
3660 nla_nest_end(skb, attrs);
3665 nla_nest_cancel(skb, stat);
3667 nla_nest_cancel(skb, attrs);
3671 EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
3673 int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
3675 return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
3678 /* Caller should hold socket lock for the passed tipc socket. */
3679 static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
3680 struct netlink_callback *cb,
3681 struct publication *publ)
3684 struct nlattr *attrs;
3686 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3687 &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
3691 attrs = nla_nest_start_noflag(skb, TIPC_NLA_PUBL);
3693 goto genlmsg_cancel;
3695 if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
3696 goto attr_msg_cancel;
3697 if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->sr.type))
3698 goto attr_msg_cancel;
3699 if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->sr.lower))
3700 goto attr_msg_cancel;
3701 if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->sr.upper))
3702 goto attr_msg_cancel;
3704 nla_nest_end(skb, attrs);
3705 genlmsg_end(skb, hdr);
3710 nla_nest_cancel(skb, attrs);
3712 genlmsg_cancel(skb, hdr);
3717 /* Caller should hold socket lock for the passed tipc socket. */
3718 static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
3719 struct netlink_callback *cb,
3720 struct tipc_sock *tsk, u32 *last_publ)
3723 struct publication *p;
3726 list_for_each_entry(p, &tsk->publications, binding_sock) {
3727 if (p->key == *last_publ)
3730 if (p->key != *last_publ) {
3731 /* We never set seq or call nl_dump_check_consistent()
3732 * this means that setting prev_seq here will cause the
3733 * consistence check to fail in the netlink callback
3734 * handler. Resulting in the last NLMSG_DONE message
3735 * having the NLM_F_DUMP_INTR flag set.
3742 p = list_first_entry(&tsk->publications, struct publication,
3746 list_for_each_entry_from(p, &tsk->publications, binding_sock) {
3747 err = __tipc_nl_add_sk_publ(skb, cb, p);
3749 *last_publ = p->key;
3758 int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
3761 u32 tsk_portid = cb->args[0];
3762 u32 last_publ = cb->args[1];
3763 u32 done = cb->args[2];
3764 struct net *net = sock_net(skb->sk);
3765 struct tipc_sock *tsk;
3768 struct nlattr **attrs = genl_dumpit_info(cb)->attrs;
3769 struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
3771 if (!attrs[TIPC_NLA_SOCK])
3774 err = nla_parse_nested_deprecated(sock, TIPC_NLA_SOCK_MAX,
3775 attrs[TIPC_NLA_SOCK],
3776 tipc_nl_sock_policy, NULL);
3780 if (!sock[TIPC_NLA_SOCK_REF])
3783 tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
3789 tsk = tipc_sk_lookup(net, tsk_portid);
3793 lock_sock(&tsk->sk);
3794 err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
3797 release_sock(&tsk->sk);
3800 cb->args[0] = tsk_portid;
3801 cb->args[1] = last_publ;
3808 * tipc_sk_filtering - check if a socket should be traced
3809 * @sk: the socket to be examined
3811 * @sysctl_tipc_sk_filter is used as the socket tuple for filtering:
3812 * (portid, sock type, name type, name lower, name upper)
3814 * Return: true if the socket meets the socket tuple data
3815 * (value 0 = 'any') or when there is no tuple set (all = 0),
3818 bool tipc_sk_filtering(struct sock *sk)
3820 struct tipc_sock *tsk;
3821 struct publication *p;
3822 u32 _port, _sktype, _type, _lower, _upper;
3823 u32 type = 0, lower = 0, upper = 0;
3830 _port = sysctl_tipc_sk_filter[0];
3831 _sktype = sysctl_tipc_sk_filter[1];
3832 _type = sysctl_tipc_sk_filter[2];
3833 _lower = sysctl_tipc_sk_filter[3];
3834 _upper = sysctl_tipc_sk_filter[4];
3836 if (!_port && !_sktype && !_type && !_lower && !_upper)
3840 return (_port == tsk->portid);
3842 if (_sktype && _sktype != sk->sk_type)
3845 if (tsk->published) {
3846 p = list_first_entry_or_null(&tsk->publications,
3847 struct publication, binding_sock);
3850 lower = p->sr.lower;
3851 upper = p->sr.upper;
3855 if (!tipc_sk_type_connectionless(sk)) {
3856 type = msg_nametype(&tsk->phdr);
3857 lower = msg_nameinst(&tsk->phdr);
3861 if ((_type && _type != type) || (_lower && _lower != lower) ||
3862 (_upper && _upper != upper))
3868 u32 tipc_sock_get_portid(struct sock *sk)
3870 return (sk) ? (tipc_sk(sk))->portid : 0;
3874 * tipc_sk_overlimit1 - check if socket rx queue is about to be overloaded,
3875 * both the rcv and backlog queues are considered
3876 * @sk: tipc sk to be checked
3877 * @skb: tipc msg to be checked
3879 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3882 bool tipc_sk_overlimit1(struct sock *sk, struct sk_buff *skb)
3884 atomic_t *dcnt = &tipc_sk(sk)->dupl_rcvcnt;
3885 unsigned int lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
3886 unsigned int qsize = sk->sk_backlog.len + sk_rmem_alloc_get(sk);
3888 return (qsize > lim * 90 / 100);
3892 * tipc_sk_overlimit2 - check if socket rx queue is about to be overloaded,
3893 * only the rcv queue is considered
3894 * @sk: tipc sk to be checked
3895 * @skb: tipc msg to be checked
3897 * Return: true if the socket rx queue allocation is > 90%, otherwise false
3900 bool tipc_sk_overlimit2(struct sock *sk, struct sk_buff *skb)
3902 unsigned int lim = rcvbuf_limit(sk, skb);
3903 unsigned int qsize = sk_rmem_alloc_get(sk);
3905 return (qsize > lim * 90 / 100);
3909 * tipc_sk_dump - dump TIPC socket
3910 * @sk: tipc sk to be dumped
3911 * @dqueues: bitmask to decide if any socket queue to be dumped?
3912 * - TIPC_DUMP_NONE: don't dump socket queues
3913 * - TIPC_DUMP_SK_SNDQ: dump socket send queue
3914 * - TIPC_DUMP_SK_RCVQ: dump socket rcv queue
3915 * - TIPC_DUMP_SK_BKLGQ: dump socket backlog queue
3916 * - TIPC_DUMP_ALL: dump all the socket queues above
3917 * @buf: returned buffer of dump data in format
3919 int tipc_sk_dump(struct sock *sk, u16 dqueues, char *buf)
3922 size_t sz = (dqueues) ? SK_LMAX : SK_LMIN;
3923 u32 conn_type, conn_instance;
3924 struct tipc_sock *tsk;
3925 struct publication *p;
3929 i += scnprintf(buf, sz, "sk data: (null)\n");
3934 tsk_connected = !tipc_sk_type_connectionless(sk);
3936 i += scnprintf(buf, sz, "sk data: %u", sk->sk_type);
3937 i += scnprintf(buf + i, sz - i, " %d", sk->sk_state);
3938 i += scnprintf(buf + i, sz - i, " %x", tsk_own_node(tsk));
3939 i += scnprintf(buf + i, sz - i, " %u", tsk->portid);
3940 i += scnprintf(buf + i, sz - i, " | %u", tsk_connected);
3941 if (tsk_connected) {
3942 i += scnprintf(buf + i, sz - i, " %x", tsk_peer_node(tsk));
3943 i += scnprintf(buf + i, sz - i, " %u", tsk_peer_port(tsk));
3944 conn_type = msg_nametype(&tsk->phdr);
3945 conn_instance = msg_nameinst(&tsk->phdr);
3946 i += scnprintf(buf + i, sz - i, " %u", conn_type);
3947 i += scnprintf(buf + i, sz - i, " %u", conn_instance);
3949 i += scnprintf(buf + i, sz - i, " | %u", tsk->published);
3950 if (tsk->published) {
3951 p = list_first_entry_or_null(&tsk->publications,
3952 struct publication, binding_sock);
3953 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.type : 0);
3954 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.lower : 0);
3955 i += scnprintf(buf + i, sz - i, " %u", (p) ? p->sr.upper : 0);
3957 i += scnprintf(buf + i, sz - i, " | %u", tsk->snd_win);
3958 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_win);
3959 i += scnprintf(buf + i, sz - i, " %u", tsk->max_pkt);
3960 i += scnprintf(buf + i, sz - i, " %x", tsk->peer_caps);
3961 i += scnprintf(buf + i, sz - i, " %u", tsk->cong_link_cnt);
3962 i += scnprintf(buf + i, sz - i, " %u", tsk->snt_unacked);
3963 i += scnprintf(buf + i, sz - i, " %u", tsk->rcv_unacked);
3964 i += scnprintf(buf + i, sz - i, " %u", atomic_read(&tsk->dupl_rcvcnt));
3965 i += scnprintf(buf + i, sz - i, " %u", sk->sk_shutdown);
3966 i += scnprintf(buf + i, sz - i, " | %d", sk_wmem_alloc_get(sk));
3967 i += scnprintf(buf + i, sz - i, " %d", sk->sk_sndbuf);
3968 i += scnprintf(buf + i, sz - i, " | %d", sk_rmem_alloc_get(sk));
3969 i += scnprintf(buf + i, sz - i, " %d", sk->sk_rcvbuf);
3970 i += scnprintf(buf + i, sz - i, " | %d\n", READ_ONCE(sk->sk_backlog.len));
3972 if (dqueues & TIPC_DUMP_SK_SNDQ) {
3973 i += scnprintf(buf + i, sz - i, "sk_write_queue: ");
3974 i += tipc_list_dump(&sk->sk_write_queue, false, buf + i);
3977 if (dqueues & TIPC_DUMP_SK_RCVQ) {
3978 i += scnprintf(buf + i, sz - i, "sk_receive_queue: ");
3979 i += tipc_list_dump(&sk->sk_receive_queue, false, buf + i);
3982 if (dqueues & TIPC_DUMP_SK_BKLGQ) {
3983 i += scnprintf(buf + i, sz - i, "sk_backlog:\n head ");
3984 i += tipc_skb_dump(sk->sk_backlog.head, false, buf + i);
3985 if (sk->sk_backlog.tail != sk->sk_backlog.head) {
3986 i += scnprintf(buf + i, sz - i, " tail ");
3987 i += tipc_skb_dump(sk->sk_backlog.tail, false,