Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3569 insertions, 0 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
new file mode 100644
index 000000000..6c18b4565
--- /dev/null
+++ b/net/tipc/socket.c
@@ -0,0 +1,3569 @@
+/*
+ * net/tipc/socket.c: TIPC socket API
+ *
+ * Copyright (c) 2001-2007, 2012-2017, Ericsson AB
+ * Copyright (c) 2004-2008, 2010-2013, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/rhashtable.h>
+#include <linux/sched/signal.h>
+
+#include "core.h"
+#include "name_table.h"
+#include "node.h"
+#include "link.h"
+#include "name_distr.h"
+#include "socket.h"
+#include "bcast.h"
+#include "netlink.h"
+#include "group.h"
+
+#define CONN_TIMEOUT_DEFAULT	8000	/* default connect timeout = 8s */
+#define CONN_PROBING_INTV	msecs_to_jiffies(3600000)  /* [ms] => 1 h */
+#define TIPC_FWD_MSG		1
+#define TIPC_MAX_PORT		0xffffffff
+#define TIPC_MIN_PORT		1
+#define TIPC_ACK_RATE		4       /* ACK at 1/4 of of rcv window size */
+
+enum {
+	TIPC_LISTEN = TCP_LISTEN,
+	TIPC_ESTABLISHED = TCP_ESTABLISHED,
+	TIPC_OPEN = TCP_CLOSE,
+	TIPC_DISCONNECTING = TCP_CLOSE_WAIT,
+	TIPC_CONNECTING = TCP_SYN_SENT,
+};
+
+struct sockaddr_pair {
+	struct sockaddr_tipc sock;
+	struct sockaddr_tipc member;
+};
+
+/**
+ * struct tipc_sock - TIPC socket structure
+ * @sk: socket - interacts with 'port' and with user via the socket API
+ * @conn_type: TIPC type used when connection was established
+ * @conn_instance: TIPC instance used when connection was established
+ * @published: non-zero if port has one or more associated names
+ * @max_pkt: maximum packet size "hint" used when building messages sent by port
+ * @portid: unique port identity in TIPC socket hash table
+ * @phdr: preformatted message header used when sending messages
+ * #cong_links: list of congested links
+ * @publications: list of publications for port
+ * @blocking_link: address of the congested link we are currently sleeping on
+ * @pub_count: total # of publications port has made during its lifetime
+ * @probing_state:
+ * @conn_timeout: the time we can wait for an unresponded setup request
+ * @dupl_rcvcnt: number of bytes counted twice, in both backlog and rcv queue
+ * @cong_link_cnt: number of congested links
+ * @snt_unacked: # messages sent by socket, and not yet acked by peer
+ * @rcv_unacked: # messages read by user, but not yet acked back to peer
+ * @peer: 'connected' peer for dgram/rdm
+ * @node: hash table node
+ * @mc_method: cookie for use between socket and broadcast layer
+ * @rcu: rcu struct for tipc_sock
+ */
+struct tipc_sock {
+	struct sock sk;
+	u32 conn_type;
+	u32 conn_instance;
+	int published;
+	u32 max_pkt;
+	u32 portid;
+	struct tipc_msg phdr;
+	struct list_head cong_links;
+	struct list_head publications;
+	u32 pub_count;
+	uint conn_timeout;
+	atomic_t dupl_rcvcnt;
+	bool probe_unacked;
+	u16 cong_link_cnt;
+	u16 snt_unacked;
+	u16 snd_win;
+	u16 peer_caps;
+	u16 rcv_unacked;
+	u16 rcv_win;
+	struct sockaddr_tipc peer;
+	struct rhash_head node;
+	struct tipc_mc_method mc_method;
+	struct rcu_head rcu;
+	struct tipc_group *group;
+	bool group_is_open;
+};
+
+static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);
+static void tipc_data_ready(struct sock *sk);
+static void tipc_write_space(struct sock *sk);
+static void tipc_sock_destruct(struct sock *sk);
+static int tipc_release(struct socket *sock);
+static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
+		       bool kern);
+static void tipc_sk_timeout(struct timer_list *t);
+static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
+			   struct tipc_name_seq const *seq);
+static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
+			    struct tipc_name_seq const *seq);
+static int tipc_sk_leave(struct tipc_sock *tsk);
+static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid);
+static int tipc_sk_insert(struct tipc_sock *tsk);
+static void tipc_sk_remove(struct tipc_sock *tsk);
+static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz);
+static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dsz);
+
+static const struct proto_ops packet_ops;
+static const struct proto_ops stream_ops;
+static const struct proto_ops msg_ops;
+static struct proto tipc_proto;
+static const struct rhashtable_params tsk_rht_params;
+
+static u32 tsk_own_node(struct tipc_sock *tsk)
+{
+	return msg_prevnode(&tsk->phdr);
+}
+
+static u32 tsk_peer_node(struct tipc_sock *tsk)
+{
+	return msg_destnode(&tsk->phdr);
+}
+
+static u32 tsk_peer_port(struct tipc_sock *tsk)
+{
+	return msg_destport(&tsk->phdr);
+}
+
+static  bool tsk_unreliable(struct tipc_sock *tsk)
+{
+	return msg_src_droppable(&tsk->phdr) != 0;
+}
+
+static void tsk_set_unreliable(struct tipc_sock *tsk, bool unreliable)
+{
+	msg_set_src_droppable(&tsk->phdr, unreliable ? 1 : 0);
+}
+
+static bool tsk_unreturnable(struct tipc_sock *tsk)
+{
+	return msg_dest_droppable(&tsk->phdr) != 0;
+}
+
+static void tsk_set_unreturnable(struct tipc_sock *tsk, bool unreturnable)
+{
+	msg_set_dest_droppable(&tsk->phdr, unreturnable ? 1 : 0);
+}
+
+static int tsk_importance(struct tipc_sock *tsk)
+{
+	return msg_importance(&tsk->phdr);
+}
+
+static int tsk_set_importance(struct tipc_sock *tsk, int imp)
+{
+	if (imp > TIPC_CRITICAL_IMPORTANCE)
+		return -EINVAL;
+	msg_set_importance(&tsk->phdr, (u32)imp);
+	return 0;
+}
+
+static struct tipc_sock *tipc_sk(const struct sock *sk)
+{
+	return container_of(sk, struct tipc_sock, sk);
+}
+
+static bool tsk_conn_cong(struct tipc_sock *tsk)
+{
+	return tsk->snt_unacked > tsk->snd_win;
+}
+
+static u16 tsk_blocks(int len)
+{
+	return ((len / FLOWCTL_BLK_SZ) + 1);
+}
+
+/* tsk_blocks(): translate a buffer size in bytes to number of
+ * advertisable blocks, taking into account the ratio truesize(len)/len
+ * We can trust that this ratio is always < 4 for len >= FLOWCTL_BLK_SZ
+ */
+static u16 tsk_adv_blocks(int len)
+{
+	return len / FLOWCTL_BLK_SZ / 4;
+}
+
+/* tsk_inc(): increment counter for sent or received data
+ * - If block based flow control is not supported by peer we
+ *   fall back to message based ditto, incrementing the counter
+ */
+static u16 tsk_inc(struct tipc_sock *tsk, int msglen)
+{
+	if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
+		return ((msglen / FLOWCTL_BLK_SZ) + 1);
+	return 1;
+}
+
+/**
+ * tsk_advance_rx_queue - discard first buffer in socket receive queue
+ *
+ * Caller must hold socket lock
+ */
+static void tsk_advance_rx_queue(struct sock *sk)
+{
+	kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
+}
+
+/* tipc_sk_respond() : send response message back to sender
+ */
+static void tipc_sk_respond(struct sock *sk, struct sk_buff *skb, int err)
+{
+	u32 selector;
+	u32 dnode;
+	u32 onode = tipc_own_addr(sock_net(sk));
+
+	if (!tipc_msg_reverse(onode, &skb, err))
+		return;
+
+	dnode = msg_destnode(buf_msg(skb));
+	selector = msg_origport(buf_msg(skb));
+	tipc_node_xmit_skb(sock_net(sk), skb, dnode, selector);
+}
+
+/**
+ * tsk_rej_rx_queue - reject all buffers in socket receive queue
+ *
+ * Caller must hold socket lock
+ */
+static void tsk_rej_rx_queue(struct sock *sk)
+{
+	struct sk_buff *skb;
+
+	while ((skb = __skb_dequeue(&sk->sk_receive_queue)))
+		tipc_sk_respond(sk, skb, TIPC_ERR_NO_PORT);
+}
+
+static bool tipc_sk_connected(struct sock *sk)
+{
+	return sk->sk_state == TIPC_ESTABLISHED;
+}
+
+/* tipc_sk_type_connectionless - check if the socket is datagram socket
+ * @sk: socket
+ *
+ * Returns true if connection less, false otherwise
+ */
+static bool tipc_sk_type_connectionless(struct sock *sk)
+{
+	return sk->sk_type == SOCK_RDM || sk->sk_type == SOCK_DGRAM;
+}
+
+/* tsk_peer_msg - verify if message was sent by connected port's peer
+ *
+ * Handles cases where the node's network address has changed from
+ * the default of <0.0.0> to its configured setting.
+ */
+static bool tsk_peer_msg(struct tipc_sock *tsk, struct tipc_msg *msg)
+{
+	struct sock *sk = &tsk->sk;
+	u32 self = tipc_own_addr(sock_net(sk));
+	u32 peer_port = tsk_peer_port(tsk);
+	u32 orig_node, peer_node;
+
+	if (unlikely(!tipc_sk_connected(sk)))
+		return false;
+
+	if (unlikely(msg_origport(msg) != peer_port))
+		return false;
+
+	orig_node = msg_orignode(msg);
+	peer_node = tsk_peer_node(tsk);
+
+	if (likely(orig_node == peer_node))
+		return true;
+
+	if (!orig_node && peer_node == self)
+		return true;
+
+	if (!peer_node && orig_node == self)
+		return true;
+
+	return false;
+}
+
+/* tipc_set_sk_state - set the sk_state of the socket
+ * @sk: socket
+ *
+ * Caller must hold socket lock
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_set_sk_state(struct sock *sk, int state)
+{
+	int oldsk_state = sk->sk_state;
+	int res = -EINVAL;
+
+	switch (state) {
+	case TIPC_OPEN:
+		res = 0;
+		break;
+	case TIPC_LISTEN:
+	case TIPC_CONNECTING:
+		if (oldsk_state == TIPC_OPEN)
+			res = 0;
+		break;
+	case TIPC_ESTABLISHED:
+		if (oldsk_state == TIPC_CONNECTING ||
+		    oldsk_state == TIPC_OPEN)
+			res = 0;
+		break;
+	case TIPC_DISCONNECTING:
+		if (oldsk_state == TIPC_CONNECTING ||
+		    oldsk_state == TIPC_ESTABLISHED)
+			res = 0;
+		break;
+	}
+
+	if (!res)
+		sk->sk_state = state;
+
+	return res;
+}
+
+static int tipc_sk_sock_err(struct socket *sock, long *timeout)
+{
+	struct sock *sk = sock->sk;
+	int err = sock_error(sk);
+	int typ = sock->type;
+
+	if (err)
+		return err;
+	if (typ == SOCK_STREAM || typ == SOCK_SEQPACKET) {
+		if (sk->sk_state == TIPC_DISCONNECTING)
+			return -EPIPE;
+		else if (!tipc_sk_connected(sk))
+			return -ENOTCONN;
+	}
+	if (!*timeout)
+		return -EAGAIN;
+	if (signal_pending(current))
+		return sock_intr_errno(*timeout);
+
+	return 0;
+}
+
+#define tipc_wait_for_cond(sock_, timeo_, condition_)			       \
+({                                                                             \
+	DEFINE_WAIT_FUNC(wait_, woken_wake_function);                          \
+	struct sock *sk_;						       \
+	int rc_;							       \
+									       \
+	while ((rc_ = !(condition_))) {					       \
+		/* coupled with smp_wmb() in tipc_sk_proto_rcv() */            \
+		smp_rmb();                                                     \
+		sk_ = (sock_)->sk;					       \
+		rc_ = tipc_sk_sock_err((sock_), timeo_);		       \
+		if (rc_)						       \
+			break;						       \
+		prepare_to_wait(sk_sleep(sk_), &wait_, TASK_INTERRUPTIBLE);    \
+		release_sock(sk_);					       \
+		*(timeo_) = wait_woken(&wait_, TASK_INTERRUPTIBLE, *(timeo_)); \
+		sched_annotate_sleep();				               \
+		lock_sock(sk_);						       \
+		remove_wait_queue(sk_sleep(sk_), &wait_);		       \
+	}								       \
+	rc_;								       \
+})
+
+/**
+ * tipc_sk_create - create a TIPC socket
+ * @net: network namespace (must be default network)
+ * @sock: pre-allocated socket structure
+ * @protocol: protocol indicator (must be 0)
+ * @kern: caused by kernel or by userspace?
+ *
+ * This routine creates additional data structures used by the TIPC socket,
+ * initializes them, and links them together.
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_sk_create(struct net *net, struct socket *sock,
+			  int protocol, int kern)
+{
+	const struct proto_ops *ops;
+	struct sock *sk;
+	struct tipc_sock *tsk;
+	struct tipc_msg *msg;
+
+	/* Validate arguments */
+	if (unlikely(protocol != 0))
+		return -EPROTONOSUPPORT;
+
+	switch (sock->type) {
+	case SOCK_STREAM:
+		ops = &stream_ops;
+		break;
+	case SOCK_SEQPACKET:
+		ops = &packet_ops;
+		break;
+	case SOCK_DGRAM:
+	case SOCK_RDM:
+		ops = &msg_ops;
+		break;
+	default:
+		return -EPROTOTYPE;
+	}
+
+	/* Allocate socket's protocol area */
+	sk = sk_alloc(net, AF_TIPC, GFP_KERNEL, &tipc_proto, kern);
+	if (sk == NULL)
+		return -ENOMEM;
+
+	tsk = tipc_sk(sk);
+	tsk->max_pkt = MAX_PKT_DEFAULT;
+	INIT_LIST_HEAD(&tsk->publications);
+	INIT_LIST_HEAD(&tsk->cong_links);
+	msg = &tsk->phdr;
+
+	/* Finish initializing socket data structures */
+	sock->ops = ops;
+	sock_init_data(sock, sk);
+	tipc_set_sk_state(sk, TIPC_OPEN);
+	if (tipc_sk_insert(tsk)) {
+		pr_warn("Socket create failed; port number exhausted\n");
+		return -EINVAL;
+	}
+
+	/* Ensure tsk is visible before we read own_addr. */
+	smp_mb();
+
+	tipc_msg_init(tipc_own_addr(net), msg, TIPC_LOW_IMPORTANCE,
+		      TIPC_NAMED_MSG, NAMED_H_SIZE, 0);
+
+	msg_set_origport(msg, tsk->portid);
+	timer_setup(&sk->sk_timer, tipc_sk_timeout, 0);
+	sk->sk_shutdown = 0;
+	sk->sk_backlog_rcv = tipc_sk_backlog_rcv;
+	sk->sk_rcvbuf = sysctl_tipc_rmem[1];
+	sk->sk_data_ready = tipc_data_ready;
+	sk->sk_write_space = tipc_write_space;
+	sk->sk_destruct = tipc_sock_destruct;
+	tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
+	tsk->group_is_open = true;
+	atomic_set(&tsk->dupl_rcvcnt, 0);
+
+	/* Start out with safe limits until we receive an advertised window */
+	tsk->snd_win = tsk_adv_blocks(RCVBUF_MIN);
+	tsk->rcv_win = tsk->snd_win;
+
+	if (tipc_sk_type_connectionless(sk)) {
+		tsk_set_unreturnable(tsk, true);
+		if (sock->type == SOCK_DGRAM)
+			tsk_set_unreliable(tsk, true);
+	}
+
+	return 0;
+}
+
+static void tipc_sk_callback(struct rcu_head *head)
+{
+	struct tipc_sock *tsk = container_of(head, struct tipc_sock, rcu);
+
+	sock_put(&tsk->sk);
+}
+
+/* Caller should hold socket lock for the socket. */
+static void __tipc_shutdown(struct socket *sock, int error)
+{
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct net *net = sock_net(sk);
+	long timeout = msecs_to_jiffies(CONN_TIMEOUT_DEFAULT);
+	u32 dnode = tsk_peer_node(tsk);
+	struct sk_buff *skb;
+
+	/* Avoid that hi-prio shutdown msgs bypass msgs in link wakeup queue */
+	tipc_wait_for_cond(sock, &timeout, (!tsk->cong_link_cnt &&
+					    !tsk_conn_cong(tsk)));
+
+	/* Reject all unreceived messages, except on an active connection
+	 * (which disconnects locally & sends a 'FIN+' to peer).
+	 */
+	while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
+		if (TIPC_SKB_CB(skb)->bytes_read) {
+			kfree_skb(skb);
+			continue;
+		}
+		if (!tipc_sk_type_connectionless(sk) &&
+		    sk->sk_state != TIPC_DISCONNECTING) {
+			tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+			tipc_node_remove_conn(net, dnode, tsk->portid);
+		}
+		tipc_sk_respond(sk, skb, error);
+	}
+
+	if (tipc_sk_type_connectionless(sk))
+		return;
+
+	if (sk->sk_state != TIPC_DISCONNECTING) {
+		skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
+				      TIPC_CONN_MSG, SHORT_H_SIZE, 0, dnode,
+				      tsk_own_node(tsk), tsk_peer_port(tsk),
+				      tsk->portid, error);
+		if (skb)
+			tipc_node_xmit_skb(net, skb, dnode, tsk->portid);
+		tipc_node_remove_conn(net, dnode, tsk->portid);
+		tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+	}
+}
+
+/**
+ * tipc_release - destroy a TIPC socket
+ * @sock: socket to destroy
+ *
+ * This routine cleans up any messages that are still queued on the socket.
+ * For DGRAM and RDM socket types, all queued messages are rejected.
+ * For SEQPACKET and STREAM socket types, the first message is rejected
+ * and any others are discarded.  (If the first message on a STREAM socket
+ * is partially-read, it is discarded and the next one is rejected instead.)
+ *
+ * NOTE: Rejected messages are not necessarily returned to the sender!  They
+ * are returned or discarded according to the "destination droppable" setting
+ * specified for the message by the sender.
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_release(struct socket *sock)
+{
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk;
+
+	/*
+	 * Exit if socket isn't fully initialized (occurs when a failed accept()
+	 * releases a pre-allocated child socket that was never used)
+	 */
+	if (sk == NULL)
+		return 0;
+
+	tsk = tipc_sk(sk);
+	lock_sock(sk);
+
+	__tipc_shutdown(sock, TIPC_ERR_NO_PORT);
+	sk->sk_shutdown = SHUTDOWN_MASK;
+	tipc_sk_leave(tsk);
+	tipc_sk_withdraw(tsk, 0, NULL);
+	sk_stop_timer(sk, &sk->sk_timer);
+	tipc_sk_remove(tsk);
+
+	sock_orphan(sk);
+	/* Reject any messages that accumulated in backlog queue */
+	release_sock(sk);
+	tipc_dest_list_purge(&tsk->cong_links);
+	tsk->cong_link_cnt = 0;
+	call_rcu(&tsk->rcu, tipc_sk_callback);
+	sock->sk = NULL;
+
+	return 0;
+}
+
+/**
+ * tipc_bind - associate or disassocate TIPC name(s) with a socket
+ * @sock: socket structure
+ * @uaddr: socket address describing name(s) and desired operation
+ * @uaddr_len: size of socket address data structure
+ *
+ * Name and name sequence binding is indicated using a positive scope value;
+ * a negative scope value unbinds the specified name.  Specifying no name
+ * (i.e. a socket address length of 0) unbinds all names from the socket.
+ *
+ * Returns 0 on success, errno otherwise
+ *
+ * NOTE: This routine doesn't need to take the socket lock since it doesn't
+ *       access any non-constant socket information.
+ */
+static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
+		     int uaddr_len)
+{
+	struct sock *sk = sock->sk;
+	struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	int res = -EINVAL;
+
+	lock_sock(sk);
+	if (unlikely(!uaddr_len)) {
+		res = tipc_sk_withdraw(tsk, 0, NULL);
+		goto exit;
+	}
+	if (tsk->group) {
+		res = -EACCES;
+		goto exit;
+	}
+	if (uaddr_len < sizeof(struct sockaddr_tipc)) {
+		res = -EINVAL;
+		goto exit;
+	}
+	if (addr->family != AF_TIPC) {
+		res = -EAFNOSUPPORT;
+		goto exit;
+	}
+
+	if (addr->addrtype == TIPC_ADDR_NAME)
+		addr->addr.nameseq.upper = addr->addr.nameseq.lower;
+	else if (addr->addrtype != TIPC_ADDR_NAMESEQ) {
+		res = -EAFNOSUPPORT;
+		goto exit;
+	}
+
+	if ((addr->addr.nameseq.type < TIPC_RESERVED_TYPES) &&
+	    (addr->addr.nameseq.type != TIPC_TOP_SRV) &&
+	    (addr->addr.nameseq.type != TIPC_CFG_SRV)) {
+		res = -EACCES;
+		goto exit;
+	}
+
+	res = (addr->scope >= 0) ?
+		tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
+		tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
+exit:
+	release_sock(sk);
+	return res;
+}
+
+/**
+ * tipc_getname - get port ID of socket or peer socket
+ * @sock: socket structure
+ * @uaddr: area for returned socket address
+ * @uaddr_len: area for returned length of socket address
+ * @peer: 0 = own ID, 1 = current peer ID, 2 = current/former peer ID
+ *
+ * Returns 0 on success, errno otherwise
+ *
+ * NOTE: This routine doesn't need to take the socket lock since it only
+ *       accesses socket information that is unchanging (or which changes in
+ *       a completely predictable manner).
+ */
+static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
+			int peer)
+{
+	struct sockaddr_tipc *addr = (struct sockaddr_tipc *)uaddr;
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+
+	memset(addr, 0, sizeof(*addr));
+	if (peer) {
+		if ((!tipc_sk_connected(sk)) &&
+		    ((peer != 2) || (sk->sk_state != TIPC_DISCONNECTING)))
+			return -ENOTCONN;
+		addr->addr.id.ref = tsk_peer_port(tsk);
+		addr->addr.id.node = tsk_peer_node(tsk);
+	} else {
+		addr->addr.id.ref = tsk->portid;
+		addr->addr.id.node = tipc_own_addr(sock_net(sk));
+	}
+
+	addr->addrtype = TIPC_ADDR_ID;
+	addr->family = AF_TIPC;
+	addr->scope = 0;
+	addr->addr.name.domain = 0;
+
+	return sizeof(*addr);
+}
+
+/**
+ * tipc_poll - read and possibly block on pollmask
+ * @file: file structure associated with the socket
+ * @sock: socket for which to calculate the poll bits
+ * @wait: ???
+ *
+ * Returns pollmask value
+ *
+ * COMMENTARY:
+ * It appears that the usual socket locking mechanisms are not useful here
+ * since the pollmask info is potentially out-of-date the moment this routine
+ * exits.  TCP and other protocols seem to rely on higher level poll routines
+ * to handle any preventable race conditions, so TIPC will do the same ...
+ *
+ * IMPORTANT: The fact that a read or write operation is indicated does NOT
+ * imply that the operation will succeed, merely that it should be performed
+ * and will not block.
+ */
+static __poll_t tipc_poll(struct file *file, struct socket *sock,
+			      poll_table *wait)
+{
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	__poll_t revents = 0;
+
+	sock_poll_wait(file, sock, wait);
+
+	if (sk->sk_shutdown & RCV_SHUTDOWN)
+		revents |= EPOLLRDHUP | EPOLLIN | EPOLLRDNORM;
+	if (sk->sk_shutdown == SHUTDOWN_MASK)
+		revents |= EPOLLHUP;
+
+	switch (sk->sk_state) {
+	case TIPC_ESTABLISHED:
+		if (!tsk->cong_link_cnt && !tsk_conn_cong(tsk))
+			revents |= EPOLLOUT;
+		/* fall thru' */
+	case TIPC_LISTEN:
+	case TIPC_CONNECTING:
+		if (!skb_queue_empty_lockless(&sk->sk_receive_queue))
+			revents |= EPOLLIN | EPOLLRDNORM;
+		break;
+	case TIPC_OPEN:
+		if (tsk->group_is_open && !tsk->cong_link_cnt)
+			revents |= EPOLLOUT;
+		if (!tipc_sk_type_connectionless(sk))
+			break;
+		if (skb_queue_empty_lockless(&sk->sk_receive_queue))
+			break;
+		revents |= EPOLLIN | EPOLLRDNORM;
+		break;
+	case TIPC_DISCONNECTING:
+		revents = EPOLLIN | EPOLLRDNORM | EPOLLHUP;
+		break;
+	}
+	return revents;
+}
+
+/**
+ * tipc_sendmcast - send multicast message
+ * @sock: socket structure
+ * @seq: destination address
+ * @msg: message to send
+ * @dlen: length of data to send
+ * @timeout: timeout to wait for wakeup
+ *
+ * Called from function tipc_sendmsg(), which has done all sanity checks
+ * Returns the number of bytes sent on success, or errno
+ */
+static int tipc_sendmcast(struct  socket *sock, struct tipc_name_seq *seq,
+			  struct msghdr *msg, size_t dlen, long timeout)
+{
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_msg *hdr = &tsk->phdr;
+	struct net *net = sock_net(sk);
+	int mtu = tipc_bcast_get_mtu(net);
+	struct tipc_mc_method *method = &tsk->mc_method;
+	struct sk_buff_head pkts;
+	struct tipc_nlist dsts;
+	int rc;
+
+	if (tsk->group)
+		return -EACCES;
+
+	/* Block or return if any destination link is congested */
+	rc = tipc_wait_for_cond(sock, &timeout, !tsk->cong_link_cnt);
+	if (unlikely(rc))
+		return rc;
+
+	/* Lookup destination nodes */
+	tipc_nlist_init(&dsts, tipc_own_addr(net));
+	tipc_nametbl_lookup_dst_nodes(net, seq->type, seq->lower,
+				      seq->upper, &dsts);
+	if (!dsts.local && !dsts.remote)
+		return -EHOSTUNREACH;
+
+	/* Build message header */
+	msg_set_type(hdr, TIPC_MCAST_MSG);
+	msg_set_hdr_sz(hdr, MCAST_H_SIZE);
+	msg_set_lookup_scope(hdr, TIPC_CLUSTER_SCOPE);
+	msg_set_destport(hdr, 0);
+	msg_set_destnode(hdr, 0);
+	msg_set_nametype(hdr, seq->type);
+	msg_set_namelower(hdr, seq->lower);
+	msg_set_nameupper(hdr, seq->upper);
+
+	/* Build message as chain of buffers */
+	__skb_queue_head_init(&pkts);
+	rc = tipc_msg_build(hdr, msg, 0, dlen, mtu, &pkts);
+
+	/* Send message if build was successful */
+	if (unlikely(rc == dlen))
+		rc = tipc_mcast_xmit(net, &pkts, method, &dsts,
+				     &tsk->cong_link_cnt);
+
+	tipc_nlist_purge(&dsts);
+
+	return rc ? rc : dlen;
+}
+
+/**
+ * tipc_send_group_msg - send a message to a member in the group
+ * @net: network namespace
+ * @m: message to send
+ * @mb: group member
+ * @dnode: destination node
+ * @dport: destination port
+ * @dlen: total length of message data
+ */
+static int tipc_send_group_msg(struct net *net, struct tipc_sock *tsk,
+			       struct msghdr *m, struct tipc_member *mb,
+			       u32 dnode, u32 dport, int dlen)
+{
+	u16 bc_snd_nxt = tipc_group_bc_snd_nxt(tsk->group);
+	struct tipc_mc_method *method = &tsk->mc_method;
+	int blks = tsk_blocks(GROUP_H_SIZE + dlen);
+	struct tipc_msg *hdr = &tsk->phdr;
+	struct sk_buff_head pkts;
+	int mtu, rc;
+
+	/* Complete message header */
+	msg_set_type(hdr, TIPC_GRP_UCAST_MSG);
+	msg_set_hdr_sz(hdr, GROUP_H_SIZE);
+	msg_set_destport(hdr, dport);
+	msg_set_destnode(hdr, dnode);
+	msg_set_grp_bc_seqno(hdr, bc_snd_nxt);
+
+	/* Build message as chain of buffers */
+	__skb_queue_head_init(&pkts);
+	mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
+	rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
+	if (unlikely(rc != dlen))
+		return rc;
+
+	/* Send message */
+	rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
+	if (unlikely(rc == -ELINKCONG)) {
+		tipc_dest_push(&tsk->cong_links, dnode, 0);
+		tsk->cong_link_cnt++;
+	}
+
+	/* Update send window */
+	tipc_group_update_member(mb, blks);
+
+	/* A broadcast sent within next EXPIRE period must follow same path */
+	method->rcast = true;
+	method->mandatory = true;
+	return dlen;
+}
+
+/**
+ * tipc_send_group_unicast - send message to a member in the group
+ * @sock: socket structure
+ * @m: message to send
+ * @dlen: total length of message data
+ * @timeout: timeout to wait for wakeup
+ *
+ * Called from function tipc_sendmsg(), which has done all sanity checks
+ * Returns the number of bytes sent on success, or errno
+ */
+static int tipc_send_group_unicast(struct socket *sock, struct msghdr *m,
+				   int dlen, long timeout)
+{
+	struct sock *sk = sock->sk;
+	DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
+	int blks = tsk_blocks(GROUP_H_SIZE + dlen);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct net *net = sock_net(sk);
+	struct tipc_member *mb = NULL;
+	u32 node, port;
+	int rc;
+
+	node = dest->addr.id.node;
+	port = dest->addr.id.ref;
+	if (!port && !node)
+		return -EHOSTUNREACH;
+
+	/* Block or return if destination link or member is congested */
+	rc = tipc_wait_for_cond(sock, &timeout,
+				!tipc_dest_find(&tsk->cong_links, node, 0) &&
+				tsk->group &&
+				!tipc_group_cong(tsk->group, node, port, blks,
+						 &mb));
+	if (unlikely(rc))
+		return rc;
+
+	if (unlikely(!mb))
+		return -EHOSTUNREACH;
+
+	rc = tipc_send_group_msg(net, tsk, m, mb, node, port, dlen);
+
+	return rc ? rc : dlen;
+}
+
+/**
+ * tipc_send_group_anycast - send message to any member with given identity
+ * @sock: socket structure
+ * @m: message to send
+ * @dlen: total length of message data
+ * @timeout: timeout to wait for wakeup
+ *
+ * Called from function tipc_sendmsg(), which has done all sanity checks
+ * Returns the number of bytes sent on success, or errno
+ */
+static int tipc_send_group_anycast(struct socket *sock, struct msghdr *m,
+				   int dlen, long timeout)
+{
+	DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct list_head *cong_links = &tsk->cong_links;
+	int blks = tsk_blocks(GROUP_H_SIZE + dlen);
+	struct tipc_msg *hdr = &tsk->phdr;
+	struct tipc_member *first = NULL;
+	struct tipc_member *mbr = NULL;
+	struct net *net = sock_net(sk);
+	u32 node, port, exclude;
+	struct list_head dsts;
+	u32 type, inst, scope;
+	int lookups = 0;
+	int dstcnt, rc;
+	bool cong;
+
+	INIT_LIST_HEAD(&dsts);
+
+	type = msg_nametype(hdr);
+	inst = dest->addr.name.name.instance;
+	scope = msg_lookup_scope(hdr);
+
+	while (++lookups < 4) {
+		exclude = tipc_group_exclude(tsk->group);
+
+		first = NULL;
+
+		/* Look for a non-congested destination member, if any */
+		while (1) {
+			if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
+						 &dstcnt, exclude, false))
+				return -EHOSTUNREACH;
+			tipc_dest_pop(&dsts, &node, &port);
+			cong = tipc_group_cong(tsk->group, node, port, blks,
+					       &mbr);
+			if (!cong)
+				break;
+			if (mbr == first)
+				break;
+			if (!first)
+				first = mbr;
+		}
+
+		/* Start over if destination was not in member list */
+		if (unlikely(!mbr))
+			continue;
+
+		if (likely(!cong && !tipc_dest_find(cong_links, node, 0)))
+			break;
+
+		/* Block or return if destination link or member is congested */
+		rc = tipc_wait_for_cond(sock, &timeout,
+					!tipc_dest_find(cong_links, node, 0) &&
+					tsk->group &&
+					!tipc_group_cong(tsk->group, node, port,
+							 blks, &mbr));
+		if (unlikely(rc))
+			return rc;
+
+		/* Send, unless destination disappeared while waiting */
+		if (likely(mbr))
+			break;
+	}
+
+	if (unlikely(lookups >= 4))
+		return -EHOSTUNREACH;
+
+	rc = tipc_send_group_msg(net, tsk, m, mbr, node, port, dlen);
+
+	return rc ? rc : dlen;
+}
+
+/**
+ * tipc_send_group_bcast - send message to all members in communication group
+ * @sk: socket structure
+ * @m: message to send
+ * @dlen: total length of message data
+ * @timeout: timeout to wait for wakeup
+ *
+ * Called from function tipc_sendmsg(), which has done all sanity checks
+ * Returns the number of bytes sent on success, or errno
+ */
+static int tipc_send_group_bcast(struct socket *sock, struct msghdr *m,
+				 int dlen, long timeout)
+{
+	DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
+	struct sock *sk = sock->sk;
+	struct net *net = sock_net(sk);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_nlist *dsts;
+	struct tipc_mc_method *method = &tsk->mc_method;
+	bool ack = method->mandatory && method->rcast;
+	int blks = tsk_blocks(MCAST_H_SIZE + dlen);
+	struct tipc_msg *hdr = &tsk->phdr;
+	int mtu = tipc_bcast_get_mtu(net);
+	struct sk_buff_head pkts;
+	int rc = -EHOSTUNREACH;
+
+	/* Block or return if any destination link or member is congested */
+	rc = tipc_wait_for_cond(sock, &timeout,
+				!tsk->cong_link_cnt && tsk->group &&
+				!tipc_group_bc_cong(tsk->group, blks));
+	if (unlikely(rc))
+		return rc;
+
+	dsts = tipc_group_dests(tsk->group);
+	if (!dsts->local && !dsts->remote)
+		return -EHOSTUNREACH;
+
+	/* Complete message header */
+	if (dest) {
+		msg_set_type(hdr, TIPC_GRP_MCAST_MSG);
+		msg_set_nameinst(hdr, dest->addr.name.name.instance);
+	} else {
+		msg_set_type(hdr, TIPC_GRP_BCAST_MSG);
+		msg_set_nameinst(hdr, 0);
+	}
+	msg_set_hdr_sz(hdr, GROUP_H_SIZE);
+	msg_set_destport(hdr, 0);
+	msg_set_destnode(hdr, 0);
+	msg_set_grp_bc_seqno(hdr, tipc_group_bc_snd_nxt(tsk->group));
+
+	/* Avoid getting stuck with repeated forced replicasts */
+	msg_set_grp_bc_ack_req(hdr, ack);
+
+	/* Build message as chain of buffers */
+	__skb_queue_head_init(&pkts);
+	rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
+	if (unlikely(rc != dlen))
+		return rc;
+
+	/* Send message */
+	rc = tipc_mcast_xmit(net, &pkts, method, dsts, &tsk->cong_link_cnt);
+	if (unlikely(rc))
+		return rc;
+
+	/* Update broadcast sequence number and send windows */
+	tipc_group_update_bc_members(tsk->group, blks, ack);
+
+	/* Broadcast link is now free to choose method for next broadcast */
+	method->mandatory = false;
+	method->expires = jiffies;
+
+	return dlen;
+}
+
+/**
+ * tipc_send_group_mcast - send message to all members with given identity
+ * @sock: socket structure
+ * @m: message to send
+ * @dlen: total length of message data
+ * @timeout: timeout to wait for wakeup
+ *
+ * Called from function tipc_sendmsg(), which has done all sanity checks
+ * Returns the number of bytes sent on success, or errno
+ */
+static int tipc_send_group_mcast(struct socket *sock, struct msghdr *m,
+				 int dlen, long timeout)
+{
+	struct sock *sk = sock->sk;
+	DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_group *grp = tsk->group;
+	struct tipc_msg *hdr = &tsk->phdr;
+	struct net *net = sock_net(sk);
+	u32 type, inst, scope, exclude;
+	struct list_head dsts;
+	u32 dstcnt;
+
+	INIT_LIST_HEAD(&dsts);
+
+	type = msg_nametype(hdr);
+	inst = dest->addr.name.name.instance;
+	scope = msg_lookup_scope(hdr);
+	exclude = tipc_group_exclude(grp);
+
+	if (!tipc_nametbl_lookup(net, type, inst, scope, &dsts,
+				 &dstcnt, exclude, true))
+		return -EHOSTUNREACH;
+
+	if (dstcnt == 1) {
+		tipc_dest_pop(&dsts, &dest->addr.id.node, &dest->addr.id.ref);
+		return tipc_send_group_unicast(sock, m, dlen, timeout);
+	}
+
+	tipc_dest_list_purge(&dsts);
+	return tipc_send_group_bcast(sock, m, dlen, timeout);
+}
+
+/**
+ * tipc_sk_mcast_rcv - Deliver multicast messages to all destination sockets
+ * @arrvq: queue with arriving messages, to be cloned after destination lookup
+ * @inputq: queue with cloned messages, delivered to socket after dest lookup
+ *
+ * Multi-threaded: parallel calls with reference to same queues may occur
+ */
+void tipc_sk_mcast_rcv(struct net *net, struct sk_buff_head *arrvq,
+		       struct sk_buff_head *inputq)
+{
+	u32 self = tipc_own_addr(net);
+	u32 type, lower, upper, scope;
+	struct sk_buff *skb, *_skb;
+	u32 portid, onode;
+	struct sk_buff_head tmpq;
+	struct list_head dports;
+	struct tipc_msg *hdr;
+	int user, mtyp, hlen;
+	bool exact;
+
+	__skb_queue_head_init(&tmpq);
+	INIT_LIST_HEAD(&dports);
+
+	skb = tipc_skb_peek(arrvq, &inputq->lock);
+	for (; skb; skb = tipc_skb_peek(arrvq, &inputq->lock)) {
+		hdr = buf_msg(skb);
+		user = msg_user(hdr);
+		mtyp = msg_type(hdr);
+		hlen = skb_headroom(skb) + msg_hdr_sz(hdr);
+		onode = msg_orignode(hdr);
+		type = msg_nametype(hdr);
+
+		if (mtyp == TIPC_GRP_UCAST_MSG || user == GROUP_PROTOCOL) {
+			spin_lock_bh(&inputq->lock);
+			if (skb_peek(arrvq) == skb) {
+				__skb_dequeue(arrvq);
+				__skb_queue_tail(inputq, skb);
+			}
+			kfree_skb(skb);
+			spin_unlock_bh(&inputq->lock);
+			continue;
+		}
+
+		/* Group messages require exact scope match */
+		if (msg_in_group(hdr)) {
+			lower = 0;
+			upper = ~0;
+			scope = msg_lookup_scope(hdr);
+			exact = true;
+		} else {
+			/* TIPC_NODE_SCOPE means "any scope" in this context */
+			if (onode == self)
+				scope = TIPC_NODE_SCOPE;
+			else
+				scope = TIPC_CLUSTER_SCOPE;
+			exact = false;
+			lower = msg_namelower(hdr);
+			upper = msg_nameupper(hdr);
+		}
+
+		/* Create destination port list: */
+		tipc_nametbl_mc_lookup(net, type, lower, upper,
+				       scope, exact, &dports);
+
+		/* Clone message per destination */
+		while (tipc_dest_pop(&dports, NULL, &portid)) {
+			_skb = __pskb_copy(skb, hlen, GFP_ATOMIC);
+			if (_skb) {
+				msg_set_destport(buf_msg(_skb), portid);
+				__skb_queue_tail(&tmpq, _skb);
+				continue;
+			}
+			pr_warn("Failed to clone mcast rcv buffer\n");
+		}
+		/* Append to inputq if not already done by other thread */
+		spin_lock_bh(&inputq->lock);
+		if (skb_peek(arrvq) == skb) {
+			skb_queue_splice_tail_init(&tmpq, inputq);
+			/* Decrease the skb's refcnt as increasing in the
+			 * function tipc_skb_peek
+			 */
+			kfree_skb(__skb_dequeue(arrvq));
+		}
+		spin_unlock_bh(&inputq->lock);
+		__skb_queue_purge(&tmpq);
+		kfree_skb(skb);
+	}
+	tipc_sk_rcv(net, inputq);
+}
+
+/**
+ * tipc_sk_conn_proto_rcv - receive a connection mng protocol message
+ * @tsk: receiving socket
+ * @skb: pointer to message buffer.
+ */
+static void tipc_sk_conn_proto_rcv(struct tipc_sock *tsk, struct sk_buff *skb,
+				   struct sk_buff_head *inputq,
+				   struct sk_buff_head *xmitq)
+{
+	struct tipc_msg *hdr = buf_msg(skb);
+	u32 onode = tsk_own_node(tsk);
+	struct sock *sk = &tsk->sk;
+	int mtyp = msg_type(hdr);
+	bool conn_cong;
+
+	/* Ignore if connection cannot be validated: */
+	if (!tsk_peer_msg(tsk, hdr))
+		goto exit;
+
+	if (unlikely(msg_errcode(hdr))) {
+		tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+		tipc_node_remove_conn(sock_net(sk), tsk_peer_node(tsk),
+				      tsk_peer_port(tsk));
+		sk->sk_state_change(sk);
+
+		/* State change is ignored if socket already awake,
+		 * - convert msg to abort msg and add to inqueue
+		 */
+		msg_set_user(hdr, TIPC_CRITICAL_IMPORTANCE);
+		msg_set_type(hdr, TIPC_CONN_MSG);
+		msg_set_size(hdr, BASIC_H_SIZE);
+		msg_set_hdr_sz(hdr, BASIC_H_SIZE);
+		__skb_queue_tail(inputq, skb);
+		return;
+	}
+
+	tsk->probe_unacked = false;
+
+	if (mtyp == CONN_PROBE) {
+		msg_set_type(hdr, CONN_PROBE_REPLY);
+		if (tipc_msg_reverse(onode, &skb, TIPC_OK))
+			__skb_queue_tail(xmitq, skb);
+		return;
+	} else if (mtyp == CONN_ACK) {
+		conn_cong = tsk_conn_cong(tsk);
+		tsk->snt_unacked -= msg_conn_ack(hdr);
+		if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
+			tsk->snd_win = msg_adv_win(hdr);
+		if (conn_cong)
+			sk->sk_write_space(sk);
+	} else if (mtyp != CONN_PROBE_REPLY) {
+		pr_warn("Received unknown CONN_PROTO msg\n");
+	}
+exit:
+	kfree_skb(skb);
+}
+
+/**
+ * tipc_sendmsg - send message in connectionless manner
+ * @sock: socket structure
+ * @m: message to send
+ * @dsz: amount of user data to be sent
+ *
+ * Message must have an destination specified explicitly.
+ * Used for SOCK_RDM and SOCK_DGRAM messages,
+ * and for 'SYN' messages on SOCK_SEQPACKET and SOCK_STREAM connections.
+ * (Note: 'SYN+' is prohibited on SOCK_STREAM.)
+ *
+ * Returns the number of bytes sent on success, or errno otherwise
+ */
+static int tipc_sendmsg(struct socket *sock,
+			struct msghdr *m, size_t dsz)
+{
+	struct sock *sk = sock->sk;
+	int ret;
+
+	lock_sock(sk);
+	ret = __tipc_sendmsg(sock, m, dsz);
+	release_sock(sk);
+
+	return ret;
+}
+
+static int __tipc_sendmsg(struct socket *sock, struct msghdr *m, size_t dlen)
+{
+	struct sock *sk = sock->sk;
+	struct net *net = sock_net(sk);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
+	long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
+	struct list_head *clinks = &tsk->cong_links;
+	bool syn = !tipc_sk_type_connectionless(sk);
+	struct tipc_group *grp = tsk->group;
+	struct tipc_msg *hdr = &tsk->phdr;
+	struct tipc_name_seq *seq;
+	struct sk_buff_head pkts;
+	u32 dport, dnode = 0;
+	u32 type, inst;
+	int mtu, rc;
+
+	if (unlikely(dlen > TIPC_MAX_USER_MSG_SIZE))
+		return -EMSGSIZE;
+
+	if (likely(dest)) {
+		if (unlikely(m->msg_namelen < sizeof(*dest)))
+			return -EINVAL;
+		if (unlikely(dest->family != AF_TIPC))
+			return -EINVAL;
+	}
+
+	if (grp) {
+		if (!dest)
+			return tipc_send_group_bcast(sock, m, dlen, timeout);
+		if (dest->addrtype == TIPC_ADDR_NAME)
+			return tipc_send_group_anycast(sock, m, dlen, timeout);
+		if (dest->addrtype == TIPC_ADDR_ID)
+			return tipc_send_group_unicast(sock, m, dlen, timeout);
+		if (dest->addrtype == TIPC_ADDR_MCAST)
+			return tipc_send_group_mcast(sock, m, dlen, timeout);
+		return -EINVAL;
+	}
+
+	if (unlikely(!dest)) {
+		dest = &tsk->peer;
+		if (!syn && dest->family != AF_TIPC)
+			return -EDESTADDRREQ;
+	}
+
+	if (unlikely(syn)) {
+		if (sk->sk_state == TIPC_LISTEN)
+			return -EPIPE;
+		if (sk->sk_state != TIPC_OPEN)
+			return -EISCONN;
+		if (tsk->published)
+			return -EOPNOTSUPP;
+		if (dest->addrtype == TIPC_ADDR_NAME) {
+			tsk->conn_type = dest->addr.name.name.type;
+			tsk->conn_instance = dest->addr.name.name.instance;
+		}
+	}
+
+	seq = &dest->addr.nameseq;
+	if (dest->addrtype == TIPC_ADDR_MCAST)
+		return tipc_sendmcast(sock, seq, m, dlen, timeout);
+
+	if (dest->addrtype == TIPC_ADDR_NAME) {
+		type = dest->addr.name.name.type;
+		inst = dest->addr.name.name.instance;
+		dnode = dest->addr.name.domain;
+		msg_set_type(hdr, TIPC_NAMED_MSG);
+		msg_set_hdr_sz(hdr, NAMED_H_SIZE);
+		msg_set_nametype(hdr, type);
+		msg_set_nameinst(hdr, inst);
+		msg_set_lookup_scope(hdr, tipc_node2scope(dnode));
+		dport = tipc_nametbl_translate(net, type, inst, &dnode);
+		msg_set_destnode(hdr, dnode);
+		msg_set_destport(hdr, dport);
+		if (unlikely(!dport && !dnode))
+			return -EHOSTUNREACH;
+	} else if (dest->addrtype == TIPC_ADDR_ID) {
+		dnode = dest->addr.id.node;
+		msg_set_type(hdr, TIPC_DIRECT_MSG);
+		msg_set_lookup_scope(hdr, 0);
+		msg_set_destnode(hdr, dnode);
+		msg_set_destport(hdr, dest->addr.id.ref);
+		msg_set_hdr_sz(hdr, BASIC_H_SIZE);
+	} else {
+		return -EINVAL;
+	}
+
+	/* Block or return if destination link is congested */
+	rc = tipc_wait_for_cond(sock, &timeout,
+				!tipc_dest_find(clinks, dnode, 0));
+	if (unlikely(rc))
+		return rc;
+
+	__skb_queue_head_init(&pkts);
+	mtu = tipc_node_get_mtu(net, dnode, tsk->portid);
+	rc = tipc_msg_build(hdr, m, 0, dlen, mtu, &pkts);
+	if (unlikely(rc != dlen))
+		return rc;
+
+	rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
+	if (unlikely(rc == -ELINKCONG)) {
+		tipc_dest_push(clinks, dnode, 0);
+		tsk->cong_link_cnt++;
+		rc = 0;
+	}
+
+	if (unlikely(syn && !rc))
+		tipc_set_sk_state(sk, TIPC_CONNECTING);
+
+	return rc ? rc : dlen;
+}
+
+/**
+ * tipc_sendstream - send stream-oriented data
+ * @sock: socket structure
+ * @m: data to send
+ * @dsz: total length of data to be transmitted
+ *
+ * Used for SOCK_STREAM data.
+ *
+ * Returns the number of bytes sent on success (or partial success),
+ * or errno if no data sent
+ */
+static int tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dsz)
+{
+	struct sock *sk = sock->sk;
+	int ret;
+
+	lock_sock(sk);
+	ret = __tipc_sendstream(sock, m, dsz);
+	release_sock(sk);
+
+	return ret;
+}
+
+static int __tipc_sendstream(struct socket *sock, struct msghdr *m, size_t dlen)
+{
+	struct sock *sk = sock->sk;
+	DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
+	long timeout = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_msg *hdr = &tsk->phdr;
+	struct net *net = sock_net(sk);
+	struct sk_buff_head pkts;
+	u32 dnode = tsk_peer_node(tsk);
+	int send, sent = 0;
+	int rc = 0;
+
+	__skb_queue_head_init(&pkts);
+
+	if (unlikely(dlen > INT_MAX))
+		return -EMSGSIZE;
+
+	/* Handle implicit connection setup */
+	if (unlikely(dest)) {
+		rc = __tipc_sendmsg(sock, m, dlen);
+		if (dlen && dlen == rc) {
+			tsk->peer_caps = tipc_node_get_capabilities(net, dnode);
+			tsk->snt_unacked = tsk_inc(tsk, dlen + msg_hdr_sz(hdr));
+		}
+		return rc;
+	}
+
+	do {
+		rc = tipc_wait_for_cond(sock, &timeout,
+					(!tsk->cong_link_cnt &&
+					 !tsk_conn_cong(tsk) &&
+					 tipc_sk_connected(sk)));
+		if (unlikely(rc))
+			break;
+
+		send = min_t(size_t, dlen - sent, TIPC_MAX_USER_MSG_SIZE);
+		rc = tipc_msg_build(hdr, m, sent, send, tsk->max_pkt, &pkts);
+		if (unlikely(rc != send))
+			break;
+
+		rc = tipc_node_xmit(net, &pkts, dnode, tsk->portid);
+		if (unlikely(rc == -ELINKCONG)) {
+			tsk->cong_link_cnt = 1;
+			rc = 0;
+		}
+		if (likely(!rc)) {
+			tsk->snt_unacked += tsk_inc(tsk, send + MIN_H_SIZE);
+			sent += send;
+		}
+	} while (sent < dlen && !rc);
+
+	return sent ? sent : rc;
+}
+
+/**
+ * tipc_send_packet - send a connection-oriented message
+ * @sock: socket structure
+ * @m: message to send
+ * @dsz: length of data to be transmitted
+ *
+ * Used for SOCK_SEQPACKET messages.
+ *
+ * Returns the number of bytes sent on success, or errno otherwise
+ */
+static int tipc_send_packet(struct socket *sock, struct msghdr *m, size_t dsz)
+{
+	if (dsz > TIPC_MAX_USER_MSG_SIZE)
+		return -EMSGSIZE;
+
+	return tipc_sendstream(sock, m, dsz);
+}
+
+/* tipc_sk_finish_conn - complete the setup of a connection
+ */
+static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
+				u32 peer_node)
+{
+	struct sock *sk = &tsk->sk;
+	struct net *net = sock_net(sk);
+	struct tipc_msg *msg = &tsk->phdr;
+
+	msg_set_destnode(msg, peer_node);
+	msg_set_destport(msg, peer_port);
+	msg_set_type(msg, TIPC_CONN_MSG);
+	msg_set_lookup_scope(msg, 0);
+	msg_set_hdr_sz(msg, SHORT_H_SIZE);
+
+	sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
+	tipc_set_sk_state(sk, TIPC_ESTABLISHED);
+	tipc_node_add_conn(net, peer_node, tsk->portid, peer_port);
+	tsk->max_pkt = tipc_node_get_mtu(net, peer_node, tsk->portid);
+	tsk->peer_caps = tipc_node_get_capabilities(net, peer_node);
+	if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL)
+		return;
+
+	/* Fall back to message based flow control */
+	tsk->rcv_win = FLOWCTL_MSG_WIN;
+	tsk->snd_win = FLOWCTL_MSG_WIN;
+}
+
+/**
+ * tipc_sk_set_orig_addr - capture sender's address for received message
+ * @m: descriptor for message info
+ * @hdr: received message header
+ *
+ * Note: Address is not captured if not requested by receiver.
+ */
+static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
+{
+	DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
+	struct tipc_msg *hdr = buf_msg(skb);
+
+	if (!srcaddr)
+		return;
+
+	srcaddr->sock.family = AF_TIPC;
+	srcaddr->sock.addrtype = TIPC_ADDR_ID;
+	srcaddr->sock.scope = 0;
+	srcaddr->sock.addr.id.ref = msg_origport(hdr);
+	srcaddr->sock.addr.id.node = msg_orignode(hdr);
+	srcaddr->sock.addr.name.domain = 0;
+	m->msg_namelen = sizeof(struct sockaddr_tipc);
+
+	if (!msg_in_group(hdr))
+		return;
+
+	/* Group message users may also want to know sending member's id */
+	srcaddr->member.family = AF_TIPC;
+	srcaddr->member.addrtype = TIPC_ADDR_NAME;
+	srcaddr->member.scope = 0;
+	srcaddr->member.addr.name.name.type = msg_nametype(hdr);
+	srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
+	srcaddr->member.addr.name.domain = 0;
+	m->msg_namelen = sizeof(*srcaddr);
+}
+
+/**
+ * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
+ * @m: descriptor for message info
+ * @skb: received message buffer
+ * @tsk: TIPC port associated with message
+ *
+ * Note: Ancillary data is not captured if not requested by receiver.
+ *
+ * Returns 0 if successful, otherwise errno
+ */
+static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
+				 struct tipc_sock *tsk)
+{
+	struct tipc_msg *msg;
+	u32 anc_data[3];
+	u32 err;
+	u32 dest_type;
+	int has_name;
+	int res;
+
+	if (likely(m->msg_controllen == 0))
+		return 0;
+	msg = buf_msg(skb);
+
+	/* Optionally capture errored message object(s) */
+	err = msg ? msg_errcode(msg) : 0;
+	if (unlikely(err)) {
+		anc_data[0] = err;
+		anc_data[1] = msg_data_sz(msg);
+		res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
+		if (res)
+			return res;
+		if (anc_data[1]) {
+			if (skb_linearize(skb))
+				return -ENOMEM;
+			msg = buf_msg(skb);
+			res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
+				       msg_data(msg));
+			if (res)
+				return res;
+		}
+	}
+
+	/* Optionally capture message destination object */
+	dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
+	switch (dest_type) {
+	case TIPC_NAMED_MSG:
+		has_name = 1;
+		anc_data[0] = msg_nametype(msg);
+		anc_data[1] = msg_namelower(msg);
+		anc_data[2] = msg_namelower(msg);
+		break;
+	case TIPC_MCAST_MSG:
+		has_name = 1;
+		anc_data[0] = msg_nametype(msg);
+		anc_data[1] = msg_namelower(msg);
+		anc_data[2] = msg_nameupper(msg);
+		break;
+	case TIPC_CONN_MSG:
+		has_name = (tsk->conn_type != 0);
+		anc_data[0] = tsk->conn_type;
+		anc_data[1] = tsk->conn_instance;
+		anc_data[2] = tsk->conn_instance;
+		break;
+	default:
+		has_name = 0;
+	}
+	if (has_name) {
+		res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
+		if (res)
+			return res;
+	}
+
+	return 0;
+}
+
+static void tipc_sk_send_ack(struct tipc_sock *tsk)
+{
+	struct sock *sk = &tsk->sk;
+	struct net *net = sock_net(sk);
+	struct sk_buff *skb = NULL;
+	struct tipc_msg *msg;
+	u32 peer_port = tsk_peer_port(tsk);
+	u32 dnode = tsk_peer_node(tsk);
+
+	if (!tipc_sk_connected(sk))
+		return;
+	skb = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0,
+			      dnode, tsk_own_node(tsk), peer_port,
+			      tsk->portid, TIPC_OK);
+	if (!skb)
+		return;
+	msg = buf_msg(skb);
+	msg_set_conn_ack(msg, tsk->rcv_unacked);
+	tsk->rcv_unacked = 0;
+
+	/* Adjust to and advertize the correct window limit */
+	if (tsk->peer_caps & TIPC_BLOCK_FLOWCTL) {
+		tsk->rcv_win = tsk_adv_blocks(tsk->sk.sk_rcvbuf);
+		msg_set_adv_win(msg, tsk->rcv_win);
+	}
+	tipc_node_xmit_skb(net, skb, dnode, msg_link_selector(msg));
+}
+
+static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
+{
+	struct sock *sk = sock->sk;
+	DEFINE_WAIT(wait);
+	long timeo = *timeop;
+	int err = sock_error(sk);
+
+	if (err)
+		return err;
+
+	for (;;) {
+		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
+		if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
+			if (sk->sk_shutdown & RCV_SHUTDOWN) {
+				err = -ENOTCONN;
+				break;
+			}
+			release_sock(sk);
+			timeo = schedule_timeout(timeo);
+			lock_sock(sk);
+		}
+		err = 0;
+		if (!skb_queue_empty(&sk->sk_receive_queue))
+			break;
+		err = -EAGAIN;
+		if (!timeo)
+			break;
+		err = sock_intr_errno(timeo);
+		if (signal_pending(current))
+			break;
+
+		err = sock_error(sk);
+		if (err)
+			break;
+	}
+	finish_wait(sk_sleep(sk), &wait);
+	*timeop = timeo;
+	return err;
+}
+
+/**
+ * tipc_recvmsg - receive packet-oriented message
+ * @m: descriptor for message info
+ * @buflen: length of user buffer area
+ * @flags: receive flags
+ *
+ * Used for SOCK_DGRAM, SOCK_RDM, and SOCK_SEQPACKET messages.
+ * If the complete message doesn't fit in user area, truncate it.
+ *
+ * Returns size of returned message data, errno otherwise
+ */
+static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
+			size_t buflen,	int flags)
+{
+	struct sock *sk = sock->sk;
+	bool connected = !tipc_sk_type_connectionless(sk);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	int rc, err, hlen, dlen, copy;
+	struct tipc_skb_cb *skb_cb;
+	struct sk_buff_head xmitq;
+	struct tipc_msg *hdr;
+	struct sk_buff *skb;
+	bool grp_evt;
+	long timeout;
+
+	/* Catch invalid receive requests */
+	if (unlikely(!buflen))
+		return -EINVAL;
+
+	lock_sock(sk);
+	if (unlikely(connected && sk->sk_state == TIPC_OPEN)) {
+		rc = -ENOTCONN;
+		goto exit;
+	}
+	timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+
+	/* Step rcv queue to first msg with data or error; wait if necessary */
+	do {
+		rc = tipc_wait_for_rcvmsg(sock, &timeout);
+		if (unlikely(rc))
+			goto exit;
+		skb = skb_peek(&sk->sk_receive_queue);
+		skb_cb = TIPC_SKB_CB(skb);
+		hdr = buf_msg(skb);
+		dlen = msg_data_sz(hdr);
+		hlen = msg_hdr_sz(hdr);
+		err = msg_errcode(hdr);
+		grp_evt = msg_is_grp_evt(hdr);
+		if (likely(dlen || err))
+			break;
+		tsk_advance_rx_queue(sk);
+	} while (1);
+
+	/* Collect msg meta data, including error code and rejected data */
+	tipc_sk_set_orig_addr(m, skb);
+	rc = tipc_sk_anc_data_recv(m, skb, tsk);
+	if (unlikely(rc))
+		goto exit;
+	hdr = buf_msg(skb);
+
+	/* Capture data if non-error msg, otherwise just set return value */
+	if (likely(!err)) {
+		int offset = skb_cb->bytes_read;
+
+		copy = min_t(int, dlen - offset, buflen);
+		rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
+		if (unlikely(rc))
+			goto exit;
+		if (unlikely(offset + copy < dlen)) {
+			if (flags & MSG_EOR) {
+				if (!(flags & MSG_PEEK))
+					skb_cb->bytes_read = offset + copy;
+			} else {
+				m->msg_flags |= MSG_TRUNC;
+				skb_cb->bytes_read = 0;
+			}
+		} else {
+			if (flags & MSG_EOR)
+				m->msg_flags |= MSG_EOR;
+			skb_cb->bytes_read = 0;
+		}
+	} else {
+		copy = 0;
+		rc = 0;
+		if (err != TIPC_CONN_SHUTDOWN && connected && !m->msg_control) {
+			rc = -ECONNRESET;
+			goto exit;
+		}
+	}
+
+	/* Mark message as group event if applicable */
+	if (unlikely(grp_evt)) {
+		if (msg_grp_evt(hdr) == TIPC_WITHDRAWN)
+			m->msg_flags |= MSG_EOR;
+		m->msg_flags |= MSG_OOB;
+		copy = 0;
+	}
+
+	/* Caption of data or error code/rejected data was successful */
+	if (unlikely(flags & MSG_PEEK))
+		goto exit;
+
+	/* Send group flow control advertisement when applicable */
+	if (tsk->group && msg_in_group(hdr) && !grp_evt) {
+		__skb_queue_head_init(&xmitq);
+		tipc_group_update_rcv_win(tsk->group, tsk_blocks(hlen + dlen),
+					  msg_orignode(hdr), msg_origport(hdr),
+					  &xmitq);
+		tipc_node_distr_xmit(sock_net(sk), &xmitq);
+	}
+
+	if (skb_cb->bytes_read)
+		goto exit;
+
+	tsk_advance_rx_queue(sk);
+
+	if (likely(!connected))
+		goto exit;
+
+	/* Send connection flow control advertisement when applicable */
+	tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
+	if (tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE)
+		tipc_sk_send_ack(tsk);
+exit:
+	release_sock(sk);
+	return rc ? rc : copy;
+}
+
+/**
+ * tipc_recvstream - receive stream-oriented data
+ * @m: descriptor for message info
+ * @buflen: total size of user buffer area
+ * @flags: receive flags
+ *
+ * Used for SOCK_STREAM messages only.  If not enough data is available
+ * will optionally wait for more; never truncates data.
+ *
+ * Returns size of returned message data, errno otherwise
+ */
+static int tipc_recvstream(struct socket *sock, struct msghdr *m,
+			   size_t buflen, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct sk_buff *skb;
+	struct tipc_msg *hdr;
+	struct tipc_skb_cb *skb_cb;
+	bool peek = flags & MSG_PEEK;
+	int offset, required, copy, copied = 0;
+	int hlen, dlen, err, rc;
+	long timeout;
+
+	/* Catch invalid receive attempts */
+	if (unlikely(!buflen))
+		return -EINVAL;
+
+	lock_sock(sk);
+
+	if (unlikely(sk->sk_state == TIPC_OPEN)) {
+		rc = -ENOTCONN;
+		goto exit;
+	}
+	required = sock_rcvlowat(sk, flags & MSG_WAITALL, buflen);
+	timeout = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
+
+	do {
+		/* Look at first msg in receive queue; wait if necessary */
+		rc = tipc_wait_for_rcvmsg(sock, &timeout);
+		if (unlikely(rc))
+			break;
+		skb = skb_peek(&sk->sk_receive_queue);
+		skb_cb = TIPC_SKB_CB(skb);
+		hdr = buf_msg(skb);
+		dlen = msg_data_sz(hdr);
+		hlen = msg_hdr_sz(hdr);
+		err = msg_errcode(hdr);
+
+		/* Discard any empty non-errored (SYN-) message */
+		if (unlikely(!dlen && !err)) {
+			tsk_advance_rx_queue(sk);
+			continue;
+		}
+
+		/* Collect msg meta data, incl. error code and rejected data */
+		if (!copied) {
+			tipc_sk_set_orig_addr(m, skb);
+			rc = tipc_sk_anc_data_recv(m, skb, tsk);
+			if (rc)
+				break;
+			hdr = buf_msg(skb);
+		}
+
+		/* Copy data if msg ok, otherwise return error/partial data */
+		if (likely(!err)) {
+			offset = skb_cb->bytes_read;
+			copy = min_t(int, dlen - offset, buflen - copied);
+			rc = skb_copy_datagram_msg(skb, hlen + offset, m, copy);
+			if (unlikely(rc))
+				break;
+			copied += copy;
+			offset += copy;
+			if (unlikely(offset < dlen)) {
+				if (!peek)
+					skb_cb->bytes_read = offset;
+				break;
+			}
+		} else {
+			rc = 0;
+			if ((err != TIPC_CONN_SHUTDOWN) && !m->msg_control)
+				rc = -ECONNRESET;
+			if (copied || rc)
+				break;
+		}
+
+		if (unlikely(peek))
+			break;
+
+		tsk_advance_rx_queue(sk);
+
+		/* Send connection flow control advertisement when applicable */
+		tsk->rcv_unacked += tsk_inc(tsk, hlen + dlen);
+		if (unlikely(tsk->rcv_unacked >= tsk->rcv_win / TIPC_ACK_RATE))
+			tipc_sk_send_ack(tsk);
+
+		/* Exit if all requested data or FIN/error received */
+		if (copied == buflen || err)
+			break;
+
+	} while (!skb_queue_empty(&sk->sk_receive_queue) || copied < required);
+exit:
+	release_sock(sk);
+	return copied ? copied : rc;
+}
+
+/**
+ * tipc_write_space - wake up thread if port congestion is released
+ * @sk: socket
+ */
+static void tipc_write_space(struct sock *sk)
+{
+	struct socket_wq *wq;
+
+	rcu_read_lock();
+	wq = rcu_dereference(sk->sk_wq);
+	if (skwq_has_sleeper(wq))
+		wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT |
+						EPOLLWRNORM | EPOLLWRBAND);
+	rcu_read_unlock();
+}
+
+/**
+ * tipc_data_ready - wake up threads to indicate messages have been received
+ * @sk: socket
+ * @len: the length of messages
+ */
+static void tipc_data_ready(struct sock *sk)
+{
+	struct socket_wq *wq;
+
+	rcu_read_lock();
+	wq = rcu_dereference(sk->sk_wq);
+	if (skwq_has_sleeper(wq))
+		wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN |
+						EPOLLRDNORM | EPOLLRDBAND);
+	rcu_read_unlock();
+}
+
+static void tipc_sock_destruct(struct sock *sk)
+{
+	__skb_queue_purge(&sk->sk_receive_queue);
+}
+
+static void tipc_sk_proto_rcv(struct sock *sk,
+			      struct sk_buff_head *inputq,
+			      struct sk_buff_head *xmitq)
+{
+	struct sk_buff *skb = __skb_dequeue(inputq);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_msg *hdr = buf_msg(skb);
+	struct tipc_group *grp = tsk->group;
+	bool wakeup = false;
+
+	switch (msg_user(hdr)) {
+	case CONN_MANAGER:
+		tipc_sk_conn_proto_rcv(tsk, skb, inputq, xmitq);
+		return;
+	case SOCK_WAKEUP:
+		tipc_dest_del(&tsk->cong_links, msg_orignode(hdr), 0);
+		/* coupled with smp_rmb() in tipc_wait_for_cond() */
+		smp_wmb();
+		tsk->cong_link_cnt--;
+		wakeup = true;
+		break;
+	case GROUP_PROTOCOL:
+		tipc_group_proto_rcv(grp, &wakeup, hdr, inputq, xmitq);
+		break;
+	case TOP_SRV:
+		tipc_group_member_evt(tsk->group, &wakeup, &sk->sk_rcvbuf,
+				      hdr, inputq, xmitq);
+		break;
+	default:
+		break;
+	}
+
+	if (wakeup)
+		sk->sk_write_space(sk);
+
+	kfree_skb(skb);
+}
+
+/**
+ * tipc_filter_connect - Handle incoming message for a connection-based socket
+ * @tsk: TIPC socket
+ * @skb: pointer to message buffer. Set to NULL if buffer is consumed
+ *
+ * Returns true if everything ok, false otherwise
+ */
+static bool tipc_sk_filter_connect(struct tipc_sock *tsk, struct sk_buff *skb)
+{
+	struct sock *sk = &tsk->sk;
+	struct net *net = sock_net(sk);
+	struct tipc_msg *hdr = buf_msg(skb);
+	u32 pport = msg_origport(hdr);
+	u32 pnode = msg_orignode(hdr);
+
+	if (unlikely(msg_mcast(hdr)))
+		return false;
+
+	switch (sk->sk_state) {
+	case TIPC_CONNECTING:
+		/* Accept only ACK or NACK message */
+		if (unlikely(!msg_connected(hdr))) {
+			if (pport != tsk_peer_port(tsk) ||
+			    pnode != tsk_peer_node(tsk))
+				return false;
+
+			tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+			sk->sk_err = ECONNREFUSED;
+			sk->sk_state_change(sk);
+			return true;
+		}
+
+		if (unlikely(msg_errcode(hdr))) {
+			tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+			sk->sk_err = ECONNREFUSED;
+			sk->sk_state_change(sk);
+			return true;
+		}
+
+		if (unlikely(!msg_isdata(hdr))) {
+			tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+			sk->sk_err = EINVAL;
+			sk->sk_state_change(sk);
+			return true;
+		}
+
+		tipc_sk_finish_conn(tsk, msg_origport(hdr), msg_orignode(hdr));
+		msg_set_importance(&tsk->phdr, msg_importance(hdr));
+
+		/* If 'ACK+' message, add to socket receive queue */
+		if (msg_data_sz(hdr))
+			return true;
+
+		/* If empty 'ACK-' message, wake up sleeping connect() */
+		sk->sk_state_change(sk);
+
+		/* 'ACK-' message is neither accepted nor rejected: */
+		msg_set_dest_droppable(hdr, 1);
+		return false;
+
+	case TIPC_OPEN:
+	case TIPC_DISCONNECTING:
+		break;
+	case TIPC_LISTEN:
+		/* Accept only SYN message */
+		if (!msg_connected(hdr) && !(msg_errcode(hdr)))
+			return true;
+		break;
+	case TIPC_ESTABLISHED:
+		/* Accept only connection-based messages sent by peer */
+		if (unlikely(!tsk_peer_msg(tsk, hdr)))
+			return false;
+
+		if (unlikely(msg_errcode(hdr))) {
+			tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+			/* Let timer expire on it's own */
+			tipc_node_remove_conn(net, tsk_peer_node(tsk),
+					      tsk->portid);
+			sk->sk_state_change(sk);
+		}
+		return true;
+	default:
+		pr_err("Unknown sk_state %u\n", sk->sk_state);
+	}
+
+	return false;
+}
+
+/**
+ * rcvbuf_limit - get proper overload limit of socket receive queue
+ * @sk: socket
+ * @skb: message
+ *
+ * For connection oriented messages, irrespective of importance,
+ * default queue limit is 2 MB.
+ *
+ * For connectionless messages, queue limits are based on message
+ * importance as follows:
+ *
+ * TIPC_LOW_IMPORTANCE       (2 MB)
+ * TIPC_MEDIUM_IMPORTANCE    (4 MB)
+ * TIPC_HIGH_IMPORTANCE      (8 MB)
+ * TIPC_CRITICAL_IMPORTANCE  (16 MB)
+ *
+ * Returns overload limit according to corresponding message importance
+ */
+static unsigned int rcvbuf_limit(struct sock *sk, struct sk_buff *skb)
+{
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_msg *hdr = buf_msg(skb);
+
+	if (unlikely(msg_in_group(hdr)))
+		return sk->sk_rcvbuf;
+
+	if (unlikely(!msg_connected(hdr)))
+		return sk->sk_rcvbuf << msg_importance(hdr);
+
+	if (likely(tsk->peer_caps & TIPC_BLOCK_FLOWCTL))
+		return sk->sk_rcvbuf;
+
+	return FLOWCTL_MSG_LIM;
+}
+
+/**
+ * tipc_sk_filter_rcv - validate incoming message
+ * @sk: socket
+ * @skb: pointer to message.
+ *
+ * Enqueues message on receive queue if acceptable; optionally handles
+ * disconnect indication for a connected socket.
+ *
+ * Called with socket lock already taken
+ *
+ */
+static void tipc_sk_filter_rcv(struct sock *sk, struct sk_buff *skb,
+			       struct sk_buff_head *xmitq)
+{
+	bool sk_conn = !tipc_sk_type_connectionless(sk);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_group *grp = tsk->group;
+	struct tipc_msg *hdr = buf_msg(skb);
+	struct net *net = sock_net(sk);
+	struct sk_buff_head inputq;
+	int limit, err = TIPC_OK;
+
+	TIPC_SKB_CB(skb)->bytes_read = 0;
+	__skb_queue_head_init(&inputq);
+	__skb_queue_tail(&inputq, skb);
+
+	if (unlikely(!msg_isdata(hdr)))
+		tipc_sk_proto_rcv(sk, &inputq, xmitq);
+
+	if (unlikely(grp))
+		tipc_group_filter_msg(grp, &inputq, xmitq);
+
+	/* Validate and add to receive buffer if there is space */
+	while ((skb = __skb_dequeue(&inputq))) {
+		hdr = buf_msg(skb);
+		limit = rcvbuf_limit(sk, skb);
+		if ((sk_conn && !tipc_sk_filter_connect(tsk, skb)) ||
+		    (!sk_conn && msg_connected(hdr)) ||
+		    (!grp && msg_in_group(hdr)))
+			err = TIPC_ERR_NO_PORT;
+		else if (sk_rmem_alloc_get(sk) + skb->truesize >= limit) {
+			atomic_inc(&sk->sk_drops);
+			err = TIPC_ERR_OVERLOAD;
+		}
+
+		if (unlikely(err)) {
+			tipc_skb_reject(net, err, skb, xmitq);
+			err = TIPC_OK;
+			continue;
+		}
+		__skb_queue_tail(&sk->sk_receive_queue, skb);
+		skb_set_owner_r(skb, sk);
+		sk->sk_data_ready(sk);
+	}
+}
+
+/**
+ * tipc_sk_backlog_rcv - handle incoming message from backlog queue
+ * @sk: socket
+ * @skb: message
+ *
+ * Caller must hold socket lock
+ */
+static int tipc_sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
+{
+	unsigned int before = sk_rmem_alloc_get(sk);
+	struct sk_buff_head xmitq;
+	unsigned int added;
+
+	__skb_queue_head_init(&xmitq);
+
+	tipc_sk_filter_rcv(sk, skb, &xmitq);
+	added = sk_rmem_alloc_get(sk) - before;
+	atomic_add(added, &tipc_sk(sk)->dupl_rcvcnt);
+
+	/* Send pending response/rejected messages, if any */
+	tipc_node_distr_xmit(sock_net(sk), &xmitq);
+	return 0;
+}
+
+/**
+ * tipc_sk_enqueue - extract all buffers with destination 'dport' from
+ *                   inputq and try adding them to socket or backlog queue
+ * @inputq: list of incoming buffers with potentially different destinations
+ * @sk: socket where the buffers should be enqueued
+ * @dport: port number for the socket
+ *
+ * Caller must hold socket lock
+ */
+static void tipc_sk_enqueue(struct sk_buff_head *inputq, struct sock *sk,
+			    u32 dport, struct sk_buff_head *xmitq)
+{
+	unsigned long time_limit = jiffies + usecs_to_jiffies(20000);
+	struct sk_buff *skb;
+	unsigned int lim;
+	atomic_t *dcnt;
+	u32 onode;
+
+	while (skb_queue_len(inputq)) {
+		if (unlikely(time_after_eq(jiffies, time_limit)))
+			return;
+
+		skb = tipc_skb_dequeue(inputq, dport);
+		if (unlikely(!skb))
+			return;
+
+		/* Add message directly to receive queue if possible */
+		if (!sock_owned_by_user(sk)) {
+			tipc_sk_filter_rcv(sk, skb, xmitq);
+			continue;
+		}
+
+		/* Try backlog, compensating for double-counted bytes */
+		dcnt = &tipc_sk(sk)->dupl_rcvcnt;
+		if (!sk->sk_backlog.len)
+			atomic_set(dcnt, 0);
+		lim = rcvbuf_limit(sk, skb) + atomic_read(dcnt);
+		if (likely(!sk_add_backlog(sk, skb, lim)))
+			continue;
+
+		/* Overload => reject message back to sender */
+		onode = tipc_own_addr(sock_net(sk));
+		atomic_inc(&sk->sk_drops);
+		if (tipc_msg_reverse(onode, &skb, TIPC_ERR_OVERLOAD))
+			__skb_queue_tail(xmitq, skb);
+		break;
+	}
+}
+
+/**
+ * tipc_sk_rcv - handle a chain of incoming buffers
+ * @inputq: buffer list containing the buffers
+ * Consumes all buffers in list until inputq is empty
+ * Note: may be called in multiple threads referring to the same queue
+ */
+void tipc_sk_rcv(struct net *net, struct sk_buff_head *inputq)
+{
+	struct sk_buff_head xmitq;
+	u32 dnode, dport = 0;
+	int err;
+	struct tipc_sock *tsk;
+	struct sock *sk;
+	struct sk_buff *skb;
+
+	__skb_queue_head_init(&xmitq);
+	while (skb_queue_len(inputq)) {
+		dport = tipc_skb_peek_port(inputq, dport);
+		tsk = tipc_sk_lookup(net, dport);
+
+		if (likely(tsk)) {
+			sk = &tsk->sk;
+			if (likely(spin_trylock_bh(&sk->sk_lock.slock))) {
+				tipc_sk_enqueue(inputq, sk, dport, &xmitq);
+				spin_unlock_bh(&sk->sk_lock.slock);
+			}
+			/* Send pending response/rejected messages, if any */
+			tipc_node_distr_xmit(sock_net(sk), &xmitq);
+			sock_put(sk);
+			continue;
+		}
+		/* No destination socket => dequeue skb if still there */
+		skb = tipc_skb_dequeue(inputq, dport);
+		if (!skb)
+			return;
+
+		/* Try secondary lookup if unresolved named message */
+		err = TIPC_ERR_NO_PORT;
+		if (tipc_msg_lookup_dest(net, skb, &err))
+			goto xmit;
+
+		/* Prepare for message rejection */
+		if (!tipc_msg_reverse(tipc_own_addr(net), &skb, err))
+			continue;
+xmit:
+		dnode = msg_destnode(buf_msg(skb));
+		tipc_node_xmit_skb(net, skb, dnode, dport);
+	}
+}
+
+static int tipc_wait_for_connect(struct socket *sock, long *timeo_p)
+{
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+	struct sock *sk = sock->sk;
+	int done;
+
+	do {
+		int err = sock_error(sk);
+		if (err)
+			return err;
+		if (!*timeo_p)
+			return -ETIMEDOUT;
+		if (signal_pending(current))
+			return sock_intr_errno(*timeo_p);
+
+		add_wait_queue(sk_sleep(sk), &wait);
+		done = sk_wait_event(sk, timeo_p,
+				     sk->sk_state != TIPC_CONNECTING, &wait);
+		remove_wait_queue(sk_sleep(sk), &wait);
+	} while (!done);
+	return 0;
+}
+
+static bool tipc_sockaddr_is_sane(struct sockaddr_tipc *addr)
+{
+	if (addr->family != AF_TIPC)
+		return false;
+	if (addr->addrtype == TIPC_SERVICE_RANGE)
+		return (addr->addr.nameseq.lower <= addr->addr.nameseq.upper);
+	return (addr->addrtype == TIPC_SERVICE_ADDR ||
+		addr->addrtype == TIPC_SOCKET_ADDR);
+}
+
+/**
+ * tipc_connect - establish a connection to another TIPC port
+ * @sock: socket structure
+ * @dest: socket address for destination port
+ * @destlen: size of socket address data structure
+ * @flags: file-related flags associated with socket
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_connect(struct socket *sock, struct sockaddr *dest,
+			int destlen, int flags)
+{
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct sockaddr_tipc *dst = (struct sockaddr_tipc *)dest;
+	struct msghdr m = {NULL,};
+	long timeout = (flags & O_NONBLOCK) ? 0 : tsk->conn_timeout;
+	int previous;
+	int res = 0;
+
+	if (destlen != sizeof(struct sockaddr_tipc))
+		return -EINVAL;
+
+	lock_sock(sk);
+
+	if (tsk->group) {
+		res = -EINVAL;
+		goto exit;
+	}
+
+	if (dst->family == AF_UNSPEC) {
+		memset(&tsk->peer, 0, sizeof(struct sockaddr_tipc));
+		if (!tipc_sk_type_connectionless(sk))
+			res = -EINVAL;
+		goto exit;
+	}
+	if (!tipc_sockaddr_is_sane(dst)) {
+		res = -EINVAL;
+		goto exit;
+	}
+	/* DGRAM/RDM connect(), just save the destaddr */
+	if (tipc_sk_type_connectionless(sk)) {
+		memcpy(&tsk->peer, dest, destlen);
+		goto exit;
+	} else if (dst->addrtype == TIPC_SERVICE_RANGE) {
+		res = -EINVAL;
+		goto exit;
+	}
+
+	previous = sk->sk_state;
+
+	switch (sk->sk_state) {
+	case TIPC_OPEN:
+		/* Send a 'SYN-' to destination */
+		m.msg_name = dest;
+		m.msg_namelen = destlen;
+
+		/* If connect is in non-blocking case, set MSG_DONTWAIT to
+		 * indicate send_msg() is never blocked.
+		 */
+		if (!timeout)
+			m.msg_flags = MSG_DONTWAIT;
+
+		res = __tipc_sendmsg(sock, &m, 0);
+		if ((res < 0) && (res != -EWOULDBLOCK))
+			goto exit;
+
+		/* Just entered TIPC_CONNECTING state; the only
+		 * difference is that return value in non-blocking
+		 * case is EINPROGRESS, rather than EALREADY.
+		 */
+		res = -EINPROGRESS;
+		/* fall thru' */
+	case TIPC_CONNECTING:
+		if (!timeout) {
+			if (previous == TIPC_CONNECTING)
+				res = -EALREADY;
+			goto exit;
+		}
+		timeout = msecs_to_jiffies(timeout);
+		/* Wait until an 'ACK' or 'RST' arrives, or a timeout occurs */
+		res = tipc_wait_for_connect(sock, &timeout);
+		break;
+	case TIPC_ESTABLISHED:
+		res = -EISCONN;
+		break;
+	default:
+		res = -EINVAL;
+	}
+
+exit:
+	release_sock(sk);
+	return res;
+}
+
+/**
+ * tipc_listen - allow socket to listen for incoming connections
+ * @sock: socket structure
+ * @len: (unused)
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_listen(struct socket *sock, int len)
+{
+	struct sock *sk = sock->sk;
+	int res;
+
+	lock_sock(sk);
+	res = tipc_set_sk_state(sk, TIPC_LISTEN);
+	release_sock(sk);
+
+	return res;
+}
+
+static int tipc_wait_for_accept(struct socket *sock, long timeo)
+{
+	struct sock *sk = sock->sk;
+	DEFINE_WAIT_FUNC(wait, woken_wake_function);
+	int err;
+
+	/* True wake-one mechanism for incoming connections: only
+	 * one process gets woken up, not the 'whole herd'.
+	 * Since we do not 'race & poll' for established sockets
+	 * anymore, the common case will execute the loop only once.
+	*/
+	for (;;) {
+		if (timeo && skb_queue_empty(&sk->sk_receive_queue)) {
+			add_wait_queue(sk_sleep(sk), &wait);
+			release_sock(sk);
+			timeo = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
+			lock_sock(sk);
+			remove_wait_queue(sk_sleep(sk), &wait);
+		}
+		err = 0;
+		if (!skb_queue_empty(&sk->sk_receive_queue))
+			break;
+		err = -EAGAIN;
+		if (!timeo)
+			break;
+		err = sock_intr_errno(timeo);
+		if (signal_pending(current))
+			break;
+	}
+	return err;
+}
+
+/**
+ * tipc_accept - wait for connection request
+ * @sock: listening socket
+ * @newsock: new socket that is to be connected
+ * @flags: file-related flags associated with socket
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags,
+		       bool kern)
+{
+	struct sock *new_sk, *sk = sock->sk;
+	struct sk_buff *buf;
+	struct tipc_sock *new_tsock;
+	struct tipc_msg *msg;
+	long timeo;
+	int res;
+
+	lock_sock(sk);
+
+	if (sk->sk_state != TIPC_LISTEN) {
+		res = -EINVAL;
+		goto exit;
+	}
+	timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK);
+	res = tipc_wait_for_accept(sock, timeo);
+	if (res)
+		goto exit;
+
+	buf = skb_peek(&sk->sk_receive_queue);
+
+	res = tipc_sk_create(sock_net(sock->sk), new_sock, 0, kern);
+	if (res)
+		goto exit;
+	security_sk_clone(sock->sk, new_sock->sk);
+
+	new_sk = new_sock->sk;
+	new_tsock = tipc_sk(new_sk);
+	msg = buf_msg(buf);
+
+	/* we lock on new_sk; but lockdep sees the lock on sk */
+	lock_sock_nested(new_sk, SINGLE_DEPTH_NESTING);
+
+	/*
+	 * Reject any stray messages received by new socket
+	 * before the socket lock was taken (very, very unlikely)
+	 */
+	tsk_rej_rx_queue(new_sk);
+
+	/* Connect new socket to it's peer */
+	tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
+
+	tsk_set_importance(new_tsock, msg_importance(msg));
+	if (msg_named(msg)) {
+		new_tsock->conn_type = msg_nametype(msg);
+		new_tsock->conn_instance = msg_nameinst(msg);
+	}
+
+	/*
+	 * Respond to 'SYN-' by discarding it & returning 'ACK'-.
+	 * Respond to 'SYN+' by queuing it on new socket.
+	 */
+	if (!msg_data_sz(msg)) {
+		struct msghdr m = {NULL,};
+
+		tsk_advance_rx_queue(sk);
+		__tipc_sendstream(new_sock, &m, 0);
+	} else {
+		__skb_dequeue(&sk->sk_receive_queue);
+		__skb_queue_head(&new_sk->sk_receive_queue, buf);
+		skb_set_owner_r(buf, new_sk);
+	}
+	release_sock(new_sk);
+exit:
+	release_sock(sk);
+	return res;
+}
+
+/**
+ * tipc_shutdown - shutdown socket connection
+ * @sock: socket structure
+ * @how: direction to close (must be SHUT_RDWR)
+ *
+ * Terminates connection (if necessary), then purges socket's receive queue.
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_shutdown(struct socket *sock, int how)
+{
+	struct sock *sk = sock->sk;
+	int res;
+
+	if (how != SHUT_RDWR)
+		return -EINVAL;
+
+	lock_sock(sk);
+
+	__tipc_shutdown(sock, TIPC_CONN_SHUTDOWN);
+	sk->sk_shutdown = SHUTDOWN_MASK;
+
+	if (sk->sk_state == TIPC_DISCONNECTING) {
+		/* Discard any unreceived messages */
+		__skb_queue_purge(&sk->sk_receive_queue);
+
+		res = 0;
+	} else {
+		res = -ENOTCONN;
+	}
+	/* Wake up anyone sleeping in poll. */
+	sk->sk_state_change(sk);
+
+	release_sock(sk);
+	return res;
+}
+
+static void tipc_sk_timeout(struct timer_list *t)
+{
+	struct sock *sk = from_timer(sk, t, sk_timer);
+	struct tipc_sock *tsk = tipc_sk(sk);
+	u32 peer_port = tsk_peer_port(tsk);
+	u32 peer_node = tsk_peer_node(tsk);
+	u32 own_node = tsk_own_node(tsk);
+	u32 own_port = tsk->portid;
+	struct net *net = sock_net(sk);
+	struct sk_buff *skb = NULL;
+
+	bh_lock_sock(sk);
+	if (!tipc_sk_connected(sk))
+		goto exit;
+
+	/* Try again later if socket is busy */
+	if (sock_owned_by_user(sk)) {
+		sk_reset_timer(sk, &sk->sk_timer, jiffies + HZ / 20);
+		goto exit;
+	}
+
+	if (tsk->probe_unacked) {
+		tipc_set_sk_state(sk, TIPC_DISCONNECTING);
+		tipc_node_remove_conn(net, peer_node, peer_port);
+		sk->sk_state_change(sk);
+		goto exit;
+	}
+	/* Send new probe */
+	skb = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE, 0,
+			      peer_node, own_node, peer_port, own_port,
+			      TIPC_OK);
+	tsk->probe_unacked = true;
+	sk_reset_timer(sk, &sk->sk_timer, jiffies + CONN_PROBING_INTV);
+exit:
+	bh_unlock_sock(sk);
+	if (skb)
+		tipc_node_xmit_skb(net, skb, peer_node, own_port);
+	sock_put(sk);
+}
+
+static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
+			   struct tipc_name_seq const *seq)
+{
+	struct sock *sk = &tsk->sk;
+	struct net *net = sock_net(sk);
+	struct publication *publ;
+	u32 key;
+
+	if (scope != TIPC_NODE_SCOPE)
+		scope = TIPC_CLUSTER_SCOPE;
+
+	if (tipc_sk_connected(sk))
+		return -EINVAL;
+	key = tsk->portid + tsk->pub_count + 1;
+	if (key == tsk->portid)
+		return -EADDRINUSE;
+
+	publ = tipc_nametbl_publish(net, seq->type, seq->lower, seq->upper,
+				    scope, tsk->portid, key);
+	if (unlikely(!publ))
+		return -EINVAL;
+
+	list_add(&publ->binding_sock, &tsk->publications);
+	tsk->pub_count++;
+	tsk->published = 1;
+	return 0;
+}
+
+static int tipc_sk_withdraw(struct tipc_sock *tsk, uint scope,
+			    struct tipc_name_seq const *seq)
+{
+	struct net *net = sock_net(&tsk->sk);
+	struct publication *publ;
+	struct publication *safe;
+	int rc = -EINVAL;
+
+	if (scope != TIPC_NODE_SCOPE)
+		scope = TIPC_CLUSTER_SCOPE;
+
+	list_for_each_entry_safe(publ, safe, &tsk->publications, binding_sock) {
+		if (seq) {
+			if (publ->scope != scope)
+				continue;
+			if (publ->type != seq->type)
+				continue;
+			if (publ->lower != seq->lower)
+				continue;
+			if (publ->upper != seq->upper)
+				break;
+			tipc_nametbl_withdraw(net, publ->type, publ->lower,
+					      publ->upper, publ->key);
+			rc = 0;
+			break;
+		}
+		tipc_nametbl_withdraw(net, publ->type, publ->lower,
+				      publ->upper, publ->key);
+		rc = 0;
+	}
+	if (list_empty(&tsk->publications))
+		tsk->published = 0;
+	return rc;
+}
+
+/* tipc_sk_reinit: set non-zero address in all existing sockets
+ *                 when we go from standalone to network mode.
+ */
+void tipc_sk_reinit(struct net *net)
+{
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
+	struct rhashtable_iter iter;
+	struct tipc_sock *tsk;
+	struct tipc_msg *msg;
+
+	rhashtable_walk_enter(&tn->sk_rht, &iter);
+
+	do {
+		rhashtable_walk_start(&iter);
+
+		while ((tsk = rhashtable_walk_next(&iter)) && !IS_ERR(tsk)) {
+			sock_hold(&tsk->sk);
+			rhashtable_walk_stop(&iter);
+			lock_sock(&tsk->sk);
+			msg = &tsk->phdr;
+			msg_set_prevnode(msg, tipc_own_addr(net));
+			msg_set_orignode(msg, tipc_own_addr(net));
+			release_sock(&tsk->sk);
+			rhashtable_walk_start(&iter);
+			sock_put(&tsk->sk);
+		}
+
+		rhashtable_walk_stop(&iter);
+	} while (tsk == ERR_PTR(-EAGAIN));
+
+	rhashtable_walk_exit(&iter);
+}
+
+static struct tipc_sock *tipc_sk_lookup(struct net *net, u32 portid)
+{
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
+	struct tipc_sock *tsk;
+
+	rcu_read_lock();
+	tsk = rhashtable_lookup_fast(&tn->sk_rht, &portid, tsk_rht_params);
+	if (tsk)
+		sock_hold(&tsk->sk);
+	rcu_read_unlock();
+
+	return tsk;
+}
+
+static int tipc_sk_insert(struct tipc_sock *tsk)
+{
+	struct sock *sk = &tsk->sk;
+	struct net *net = sock_net(sk);
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
+	u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
+	u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
+
+	while (remaining--) {
+		portid++;
+		if ((portid < TIPC_MIN_PORT) || (portid > TIPC_MAX_PORT))
+			portid = TIPC_MIN_PORT;
+		tsk->portid = portid;
+		sock_hold(&tsk->sk);
+		if (!rhashtable_lookup_insert_fast(&tn->sk_rht, &tsk->node,
+						   tsk_rht_params))
+			return 0;
+		sock_put(&tsk->sk);
+	}
+
+	return -1;
+}
+
+static void tipc_sk_remove(struct tipc_sock *tsk)
+{
+	struct sock *sk = &tsk->sk;
+	struct tipc_net *tn = net_generic(sock_net(sk), tipc_net_id);
+
+	if (!rhashtable_remove_fast(&tn->sk_rht, &tsk->node, tsk_rht_params)) {
+		WARN_ON(refcount_read(&sk->sk_refcnt) == 1);
+		__sock_put(sk);
+	}
+}
+
+static const struct rhashtable_params tsk_rht_params = {
+	.nelem_hint = 192,
+	.head_offset = offsetof(struct tipc_sock, node),
+	.key_offset = offsetof(struct tipc_sock, portid),
+	.key_len = sizeof(u32), /* portid */
+	.max_size = 1048576,
+	.min_size = 256,
+	.automatic_shrinking = true,
+};
+
+int tipc_sk_rht_init(struct net *net)
+{
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+	return rhashtable_init(&tn->sk_rht, &tsk_rht_params);
+}
+
+void tipc_sk_rht_destroy(struct net *net)
+{
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+	/* Wait for socket readers to complete */
+	synchronize_net();
+
+	rhashtable_destroy(&tn->sk_rht);
+}
+
+static int tipc_sk_join(struct tipc_sock *tsk, struct tipc_group_req *mreq)
+{
+	struct net *net = sock_net(&tsk->sk);
+	struct tipc_group *grp = tsk->group;
+	struct tipc_msg *hdr = &tsk->phdr;
+	struct tipc_name_seq seq;
+	int rc;
+
+	if (mreq->type < TIPC_RESERVED_TYPES)
+		return -EACCES;
+	if (mreq->scope > TIPC_NODE_SCOPE)
+		return -EINVAL;
+	if (grp)
+		return -EACCES;
+	grp = tipc_group_create(net, tsk->portid, mreq, &tsk->group_is_open);
+	if (!grp)
+		return -ENOMEM;
+	tsk->group = grp;
+	msg_set_lookup_scope(hdr, mreq->scope);
+	msg_set_nametype(hdr, mreq->type);
+	msg_set_dest_droppable(hdr, true);
+	seq.type = mreq->type;
+	seq.lower = mreq->instance;
+	seq.upper = seq.lower;
+	tipc_nametbl_build_group(net, grp, mreq->type, mreq->scope);
+	rc = tipc_sk_publish(tsk, mreq->scope, &seq);
+	if (rc) {
+		tipc_group_delete(net, grp);
+		tsk->group = NULL;
+		return rc;
+	}
+	/* Eliminate any risk that a broadcast overtakes sent JOINs */
+	tsk->mc_method.rcast = true;
+	tsk->mc_method.mandatory = true;
+	tipc_group_join(net, grp, &tsk->sk.sk_rcvbuf);
+	return rc;
+}
+
+static int tipc_sk_leave(struct tipc_sock *tsk)
+{
+	struct net *net = sock_net(&tsk->sk);
+	struct tipc_group *grp = tsk->group;
+	struct tipc_name_seq seq;
+	int scope;
+
+	if (!grp)
+		return -EINVAL;
+	tipc_group_self(grp, &seq, &scope);
+	tipc_group_delete(net, grp);
+	tsk->group = NULL;
+	tipc_sk_withdraw(tsk, scope, &seq);
+	return 0;
+}
+
+/**
+ * tipc_setsockopt - set socket option
+ * @sock: socket structure
+ * @lvl: option level
+ * @opt: option identifier
+ * @ov: pointer to new option value
+ * @ol: length of option value
+ *
+ * For stream sockets only, accepts and ignores all IPPROTO_TCP options
+ * (to ease compatibility).
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
+			   char __user *ov, unsigned int ol)
+{
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_group_req mreq;
+	u32 value = 0;
+	int res = 0;
+
+	if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
+		return 0;
+	if (lvl != SOL_TIPC)
+		return -ENOPROTOOPT;
+
+	switch (opt) {
+	case TIPC_IMPORTANCE:
+	case TIPC_SRC_DROPPABLE:
+	case TIPC_DEST_DROPPABLE:
+	case TIPC_CONN_TIMEOUT:
+		if (ol < sizeof(value))
+			return -EINVAL;
+		if (get_user(value, (u32 __user *)ov))
+			return -EFAULT;
+		break;
+	case TIPC_GROUP_JOIN:
+		if (ol < sizeof(mreq))
+			return -EINVAL;
+		if (copy_from_user(&mreq, ov, sizeof(mreq)))
+			return -EFAULT;
+		break;
+	default:
+		if (ov || ol)
+			return -EINVAL;
+	}
+
+	lock_sock(sk);
+
+	switch (opt) {
+	case TIPC_IMPORTANCE:
+		res = tsk_set_importance(tsk, value);
+		break;
+	case TIPC_SRC_DROPPABLE:
+		if (sock->type != SOCK_STREAM)
+			tsk_set_unreliable(tsk, value);
+		else
+			res = -ENOPROTOOPT;
+		break;
+	case TIPC_DEST_DROPPABLE:
+		tsk_set_unreturnable(tsk, value);
+		break;
+	case TIPC_CONN_TIMEOUT:
+		tipc_sk(sk)->conn_timeout = value;
+		break;
+	case TIPC_MCAST_BROADCAST:
+		tsk->mc_method.rcast = false;
+		tsk->mc_method.mandatory = true;
+		break;
+	case TIPC_MCAST_REPLICAST:
+		tsk->mc_method.rcast = true;
+		tsk->mc_method.mandatory = true;
+		break;
+	case TIPC_GROUP_JOIN:
+		res = tipc_sk_join(tsk, &mreq);
+		break;
+	case TIPC_GROUP_LEAVE:
+		res = tipc_sk_leave(tsk);
+		break;
+	default:
+		res = -EINVAL;
+	}
+
+	release_sock(sk);
+
+	return res;
+}
+
+/**
+ * tipc_getsockopt - get socket option
+ * @sock: socket structure
+ * @lvl: option level
+ * @opt: option identifier
+ * @ov: receptacle for option value
+ * @ol: receptacle for length of option value
+ *
+ * For stream sockets only, returns 0 length result for all IPPROTO_TCP options
+ * (to ease compatibility).
+ *
+ * Returns 0 on success, errno otherwise
+ */
+static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
+			   char __user *ov, int __user *ol)
+{
+	struct sock *sk = sock->sk;
+	struct tipc_sock *tsk = tipc_sk(sk);
+	struct tipc_name_seq seq;
+	int len, scope;
+	u32 value;
+	int res;
+
+	if ((lvl == IPPROTO_TCP) && (sock->type == SOCK_STREAM))
+		return put_user(0, ol);
+	if (lvl != SOL_TIPC)
+		return -ENOPROTOOPT;
+	res = get_user(len, ol);
+	if (res)
+		return res;
+
+	lock_sock(sk);
+
+	switch (opt) {
+	case TIPC_IMPORTANCE:
+		value = tsk_importance(tsk);
+		break;
+	case TIPC_SRC_DROPPABLE:
+		value = tsk_unreliable(tsk);
+		break;
+	case TIPC_DEST_DROPPABLE:
+		value = tsk_unreturnable(tsk);
+		break;
+	case TIPC_CONN_TIMEOUT:
+		value = tsk->conn_timeout;
+		/* no need to set "res", since already 0 at this point */
+		break;
+	case TIPC_NODE_RECVQ_DEPTH:
+		value = 0; /* was tipc_queue_size, now obsolete */
+		break;
+	case TIPC_SOCK_RECVQ_DEPTH:
+		value = skb_queue_len(&sk->sk_receive_queue);
+		break;
+	case TIPC_GROUP_JOIN:
+		seq.type = 0;
+		if (tsk->group)
+			tipc_group_self(tsk->group, &seq, &scope);
+		value = seq.type;
+		break;
+	default:
+		res = -EINVAL;
+	}
+
+	release_sock(sk);
+
+	if (res)
+		return res;	/* "get" failed */
+
+	if (len < sizeof(value))
+		return -EINVAL;
+
+	if (copy_to_user(ov, &value, sizeof(value)))
+		return -EFAULT;
+
+	return put_user(sizeof(value), ol);
+}
+
+static int tipc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	struct net *net = sock_net(sock->sk);
+	struct tipc_sioc_nodeid_req nr = {0};
+	struct tipc_sioc_ln_req lnr;
+	void __user *argp = (void __user *)arg;
+
+	switch (cmd) {
+	case SIOCGETLINKNAME:
+		if (copy_from_user(&lnr, argp, sizeof(lnr)))
+			return -EFAULT;
+		if (!tipc_node_get_linkname(net,
+					    lnr.bearer_id & 0xffff, lnr.peer,
+					    lnr.linkname, TIPC_MAX_LINK_NAME)) {
+			if (copy_to_user(argp, &lnr, sizeof(lnr)))
+				return -EFAULT;
+			return 0;
+		}
+		return -EADDRNOTAVAIL;
+	case SIOCGETNODEID:
+		if (copy_from_user(&nr, argp, sizeof(nr)))
+			return -EFAULT;
+		if (!tipc_node_get_id(net, nr.peer, nr.node_id))
+			return -EADDRNOTAVAIL;
+		if (copy_to_user(argp, &nr, sizeof(nr)))
+			return -EFAULT;
+		return 0;
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+static int tipc_socketpair(struct socket *sock1, struct socket *sock2)
+{
+	struct tipc_sock *tsk2 = tipc_sk(sock2->sk);
+	struct tipc_sock *tsk1 = tipc_sk(sock1->sk);
+	u32 onode = tipc_own_addr(sock_net(sock1->sk));
+
+	tsk1->peer.family = AF_TIPC;
+	tsk1->peer.addrtype = TIPC_ADDR_ID;
+	tsk1->peer.scope = TIPC_NODE_SCOPE;
+	tsk1->peer.addr.id.ref = tsk2->portid;
+	tsk1->peer.addr.id.node = onode;
+	tsk2->peer.family = AF_TIPC;
+	tsk2->peer.addrtype = TIPC_ADDR_ID;
+	tsk2->peer.scope = TIPC_NODE_SCOPE;
+	tsk2->peer.addr.id.ref = tsk1->portid;
+	tsk2->peer.addr.id.node = onode;
+
+	tipc_sk_finish_conn(tsk1, tsk2->portid, onode);
+	tipc_sk_finish_conn(tsk2, tsk1->portid, onode);
+	return 0;
+}
+
+/* Protocol switches for the various types of TIPC sockets */
+
+static const struct proto_ops msg_ops = {
+	.owner		= THIS_MODULE,
+	.family		= AF_TIPC,
+	.release	= tipc_release,
+	.bind		= tipc_bind,
+	.connect	= tipc_connect,
+	.socketpair	= tipc_socketpair,
+	.accept		= sock_no_accept,
+	.getname	= tipc_getname,
+	.poll		= tipc_poll,
+	.ioctl		= tipc_ioctl,
+	.listen		= sock_no_listen,
+	.shutdown	= tipc_shutdown,
+	.setsockopt	= tipc_setsockopt,
+	.getsockopt	= tipc_getsockopt,
+	.sendmsg	= tipc_sendmsg,
+	.recvmsg	= tipc_recvmsg,
+	.mmap		= sock_no_mmap,
+	.sendpage	= sock_no_sendpage
+};
+
+static const struct proto_ops packet_ops = {
+	.owner		= THIS_MODULE,
+	.family		= AF_TIPC,
+	.release	= tipc_release,
+	.bind		= tipc_bind,
+	.connect	= tipc_connect,
+	.socketpair	= tipc_socketpair,
+	.accept		= tipc_accept,
+	.getname	= tipc_getname,
+	.poll		= tipc_poll,
+	.ioctl		= tipc_ioctl,
+	.listen		= tipc_listen,
+	.shutdown	= tipc_shutdown,
+	.setsockopt	= tipc_setsockopt,
+	.getsockopt	= tipc_getsockopt,
+	.sendmsg	= tipc_send_packet,
+	.recvmsg	= tipc_recvmsg,
+	.mmap		= sock_no_mmap,
+	.sendpage	= sock_no_sendpage
+};
+
+static const struct proto_ops stream_ops = {
+	.owner		= THIS_MODULE,
+	.family		= AF_TIPC,
+	.release	= tipc_release,
+	.bind		= tipc_bind,
+	.connect	= tipc_connect,
+	.socketpair	= tipc_socketpair,
+	.accept		= tipc_accept,
+	.getname	= tipc_getname,
+	.poll		= tipc_poll,
+	.ioctl		= tipc_ioctl,
+	.listen		= tipc_listen,
+	.shutdown	= tipc_shutdown,
+	.setsockopt	= tipc_setsockopt,
+	.getsockopt	= tipc_getsockopt,
+	.sendmsg	= tipc_sendstream,
+	.recvmsg	= tipc_recvstream,
+	.mmap		= sock_no_mmap,
+	.sendpage	= sock_no_sendpage
+};
+
+static const struct net_proto_family tipc_family_ops = {
+	.owner		= THIS_MODULE,
+	.family		= AF_TIPC,
+	.create		= tipc_sk_create
+};
+
+static struct proto tipc_proto = {
+	.name		= "TIPC",
+	.owner		= THIS_MODULE,
+	.obj_size	= sizeof(struct tipc_sock),
+	.sysctl_rmem	= sysctl_tipc_rmem
+};
+
+/**
+ * tipc_socket_init - initialize TIPC socket interface
+ *
+ * Returns 0 on success, errno otherwise
+ */
+int tipc_socket_init(void)
+{
+	int res;
+
+	res = proto_register(&tipc_proto, 1);
+	if (res) {
+		pr_err("Failed to register TIPC protocol type\n");
+		goto out;
+	}
+
+	res = sock_register(&tipc_family_ops);
+	if (res) {
+		pr_err("Failed to register TIPC socket type\n");
+		proto_unregister(&tipc_proto);
+		goto out;
+	}
+ out:
+	return res;
+}
+
+/**
+ * tipc_socket_stop - stop TIPC socket interface
+ */
+void tipc_socket_stop(void)
+{
+	sock_unregister(tipc_family_ops.family);
+	proto_unregister(&tipc_proto);
+}
+
+/* Caller should hold socket lock for the passed tipc socket. */
+static int __tipc_nl_add_sk_con(struct sk_buff *skb, struct tipc_sock *tsk)
+{
+	u32 peer_node;
+	u32 peer_port;
+	struct nlattr *nest;
+
+	peer_node = tsk_peer_node(tsk);
+	peer_port = tsk_peer_port(tsk);
+
+	nest = nla_nest_start(skb, TIPC_NLA_SOCK_CON);
+
+	if (nla_put_u32(skb, TIPC_NLA_CON_NODE, peer_node))
+		goto msg_full;
+	if (nla_put_u32(skb, TIPC_NLA_CON_SOCK, peer_port))
+		goto msg_full;
+
+	if (tsk->conn_type != 0) {
+		if (nla_put_flag(skb, TIPC_NLA_CON_FLAG))
+			goto msg_full;
+		if (nla_put_u32(skb, TIPC_NLA_CON_TYPE, tsk->conn_type))
+			goto msg_full;
+		if (nla_put_u32(skb, TIPC_NLA_CON_INST, tsk->conn_instance))
+			goto msg_full;
+	}
+	nla_nest_end(skb, nest);
+
+	return 0;
+
+msg_full:
+	nla_nest_cancel(skb, nest);
+
+	return -EMSGSIZE;
+}
+
+static int __tipc_nl_add_sk_info(struct sk_buff *skb, struct tipc_sock
+			  *tsk)
+{
+	struct net *net = sock_net(skb->sk);
+	struct sock *sk = &tsk->sk;
+
+	if (nla_put_u32(skb, TIPC_NLA_SOCK_REF, tsk->portid) ||
+	    nla_put_u32(skb, TIPC_NLA_SOCK_ADDR, tipc_own_addr(net)))
+		return -EMSGSIZE;
+
+	if (tipc_sk_connected(sk)) {
+		if (__tipc_nl_add_sk_con(skb, tsk))
+			return -EMSGSIZE;
+	} else if (!list_empty(&tsk->publications)) {
+		if (nla_put_flag(skb, TIPC_NLA_SOCK_HAS_PUBL))
+			return -EMSGSIZE;
+	}
+	return 0;
+}
+
+/* Caller should hold socket lock for the passed tipc socket. */
+static int __tipc_nl_add_sk(struct sk_buff *skb, struct netlink_callback *cb,
+			    struct tipc_sock *tsk)
+{
+	struct nlattr *attrs;
+	void *hdr;
+
+	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			  &tipc_genl_family, NLM_F_MULTI, TIPC_NL_SOCK_GET);
+	if (!hdr)
+		goto msg_cancel;
+
+	attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
+	if (!attrs)
+		goto genlmsg_cancel;
+
+	if (__tipc_nl_add_sk_info(skb, tsk))
+		goto attr_msg_cancel;
+
+	nla_nest_end(skb, attrs);
+	genlmsg_end(skb, hdr);
+
+	return 0;
+
+attr_msg_cancel:
+	nla_nest_cancel(skb, attrs);
+genlmsg_cancel:
+	genlmsg_cancel(skb, hdr);
+msg_cancel:
+	return -EMSGSIZE;
+}
+
+int tipc_nl_sk_walk(struct sk_buff *skb, struct netlink_callback *cb,
+		    int (*skb_handler)(struct sk_buff *skb,
+				       struct netlink_callback *cb,
+				       struct tipc_sock *tsk))
+{
+	struct rhashtable_iter *iter = (void *)cb->args[4];
+	struct tipc_sock *tsk;
+	int err;
+
+	rhashtable_walk_start(iter);
+	while ((tsk = rhashtable_walk_next(iter)) != NULL) {
+		if (IS_ERR(tsk)) {
+			err = PTR_ERR(tsk);
+			if (err == -EAGAIN) {
+				err = 0;
+				continue;
+			}
+			break;
+		}
+
+		sock_hold(&tsk->sk);
+		rhashtable_walk_stop(iter);
+		lock_sock(&tsk->sk);
+		err = skb_handler(skb, cb, tsk);
+		if (err) {
+			release_sock(&tsk->sk);
+			sock_put(&tsk->sk);
+			goto out;
+		}
+		release_sock(&tsk->sk);
+		rhashtable_walk_start(iter);
+		sock_put(&tsk->sk);
+	}
+	rhashtable_walk_stop(iter);
+out:
+	return skb->len;
+}
+EXPORT_SYMBOL(tipc_nl_sk_walk);
+
+int tipc_dump_start(struct netlink_callback *cb)
+{
+	return __tipc_dump_start(cb, sock_net(cb->skb->sk));
+}
+EXPORT_SYMBOL(tipc_dump_start);
+
+int __tipc_dump_start(struct netlink_callback *cb, struct net *net)
+{
+	/* tipc_nl_name_table_dump() uses cb->args[0...3]. */
+	struct rhashtable_iter *iter = (void *)cb->args[4];
+	struct tipc_net *tn = tipc_net(net);
+
+	if (!iter) {
+		iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+		if (!iter)
+			return -ENOMEM;
+
+		cb->args[4] = (long)iter;
+	}
+
+	rhashtable_walk_enter(&tn->sk_rht, iter);
+	return 0;
+}
+
+int tipc_dump_done(struct netlink_callback *cb)
+{
+	struct rhashtable_iter *hti = (void *)cb->args[4];
+
+	rhashtable_walk_exit(hti);
+	kfree(hti);
+	return 0;
+}
+EXPORT_SYMBOL(tipc_dump_done);
+
+int tipc_sk_fill_sock_diag(struct sk_buff *skb, struct netlink_callback *cb,
+			   struct tipc_sock *tsk, u32 sk_filter_state,
+			   u64 (*tipc_diag_gen_cookie)(struct sock *sk))
+{
+	struct sock *sk = &tsk->sk;
+	struct nlattr *attrs;
+	struct nlattr *stat;
+
+	/*filter response w.r.t sk_state*/
+	if (!(sk_filter_state & (1 << sk->sk_state)))
+		return 0;
+
+	attrs = nla_nest_start(skb, TIPC_NLA_SOCK);
+	if (!attrs)
+		goto msg_cancel;
+
+	if (__tipc_nl_add_sk_info(skb, tsk))
+		goto attr_msg_cancel;
+
+	if (nla_put_u32(skb, TIPC_NLA_SOCK_TYPE, (u32)sk->sk_type) ||
+	    nla_put_u32(skb, TIPC_NLA_SOCK_TIPC_STATE, (u32)sk->sk_state) ||
+	    nla_put_u32(skb, TIPC_NLA_SOCK_INO, sock_i_ino(sk)) ||
+	    nla_put_u32(skb, TIPC_NLA_SOCK_UID,
+			from_kuid_munged(sk_user_ns(NETLINK_CB(cb->skb).sk),
+					 sock_i_uid(sk))) ||
+	    nla_put_u64_64bit(skb, TIPC_NLA_SOCK_COOKIE,
+			      tipc_diag_gen_cookie(sk),
+			      TIPC_NLA_SOCK_PAD))
+		goto attr_msg_cancel;
+
+	stat = nla_nest_start(skb, TIPC_NLA_SOCK_STAT);
+	if (!stat)
+		goto attr_msg_cancel;
+
+	if (nla_put_u32(skb, TIPC_NLA_SOCK_STAT_RCVQ,
+			skb_queue_len(&sk->sk_receive_queue)) ||
+	    nla_put_u32(skb, TIPC_NLA_SOCK_STAT_SENDQ,
+			skb_queue_len(&sk->sk_write_queue)) ||
+	    nla_put_u32(skb, TIPC_NLA_SOCK_STAT_DROP,
+			atomic_read(&sk->sk_drops)))
+		goto stat_msg_cancel;
+
+	if (tsk->cong_link_cnt &&
+	    nla_put_flag(skb, TIPC_NLA_SOCK_STAT_LINK_CONG))
+		goto stat_msg_cancel;
+
+	if (tsk_conn_cong(tsk) &&
+	    nla_put_flag(skb, TIPC_NLA_SOCK_STAT_CONN_CONG))
+		goto stat_msg_cancel;
+
+	nla_nest_end(skb, stat);
+
+	if (tsk->group)
+		if (tipc_group_fill_sock_diag(tsk->group, skb))
+			goto stat_msg_cancel;
+
+	nla_nest_end(skb, attrs);
+
+	return 0;
+
+stat_msg_cancel:
+	nla_nest_cancel(skb, stat);
+attr_msg_cancel:
+	nla_nest_cancel(skb, attrs);
+msg_cancel:
+	return -EMSGSIZE;
+}
+EXPORT_SYMBOL(tipc_sk_fill_sock_diag);
+
+int tipc_nl_sk_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	return tipc_nl_sk_walk(skb, cb, __tipc_nl_add_sk);
+}
+
+/* Caller should hold socket lock for the passed tipc socket. */
+static int __tipc_nl_add_sk_publ(struct sk_buff *skb,
+				 struct netlink_callback *cb,
+				 struct publication *publ)
+{
+	void *hdr;
+	struct nlattr *attrs;
+
+	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+			  &tipc_genl_family, NLM_F_MULTI, TIPC_NL_PUBL_GET);
+	if (!hdr)
+		goto msg_cancel;
+
+	attrs = nla_nest_start(skb, TIPC_NLA_PUBL);
+	if (!attrs)
+		goto genlmsg_cancel;
+
+	if (nla_put_u32(skb, TIPC_NLA_PUBL_KEY, publ->key))
+		goto attr_msg_cancel;
+	if (nla_put_u32(skb, TIPC_NLA_PUBL_TYPE, publ->type))
+		goto attr_msg_cancel;
+	if (nla_put_u32(skb, TIPC_NLA_PUBL_LOWER, publ->lower))
+		goto attr_msg_cancel;
+	if (nla_put_u32(skb, TIPC_NLA_PUBL_UPPER, publ->upper))
+		goto attr_msg_cancel;
+
+	nla_nest_end(skb, attrs);
+	genlmsg_end(skb, hdr);
+
+	return 0;
+
+attr_msg_cancel:
+	nla_nest_cancel(skb, attrs);
+genlmsg_cancel:
+	genlmsg_cancel(skb, hdr);
+msg_cancel:
+	return -EMSGSIZE;
+}
+
+/* Caller should hold socket lock for the passed tipc socket. */
+static int __tipc_nl_list_sk_publ(struct sk_buff *skb,
+				  struct netlink_callback *cb,
+				  struct tipc_sock *tsk, u32 *last_publ)
+{
+	int err;
+	struct publication *p;
+
+	if (*last_publ) {
+		list_for_each_entry(p, &tsk->publications, binding_sock) {
+			if (p->key == *last_publ)
+				break;
+		}
+		if (list_entry_is_head(p, &tsk->publications, binding_sock)) {
+			/* We never set seq or call nl_dump_check_consistent()
+			 * this means that setting prev_seq here will cause the
+			 * consistence check to fail in the netlink callback
+			 * handler. Resulting in the last NLMSG_DONE message
+			 * having the NLM_F_DUMP_INTR flag set.
+			 */
+			cb->prev_seq = 1;
+			*last_publ = 0;
+			return -EPIPE;
+		}
+	} else {
+		p = list_first_entry(&tsk->publications, struct publication,
+				     binding_sock);
+	}
+
+	list_for_each_entry_from(p, &tsk->publications, binding_sock) {
+		err = __tipc_nl_add_sk_publ(skb, cb, p);
+		if (err) {
+			*last_publ = p->key;
+			return err;
+		}
+	}
+	*last_publ = 0;
+
+	return 0;
+}
+
+int tipc_nl_publ_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+	int err;
+	u32 tsk_portid = cb->args[0];
+	u32 last_publ = cb->args[1];
+	u32 done = cb->args[2];
+	struct net *net = sock_net(skb->sk);
+	struct tipc_sock *tsk;
+
+	if (!tsk_portid) {
+		struct nlattr **attrs;
+		struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
+
+		err = tipc_nlmsg_parse(cb->nlh, &attrs);
+		if (err)
+			return err;
+
+		if (!attrs[TIPC_NLA_SOCK])
+			return -EINVAL;
+
+		err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX,
+				       attrs[TIPC_NLA_SOCK],
+				       tipc_nl_sock_policy, NULL);
+		if (err)
+			return err;
+
+		if (!sock[TIPC_NLA_SOCK_REF])
+			return -EINVAL;
+
+		tsk_portid = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
+	}
+
+	if (done)
+		return 0;
+
+	tsk = tipc_sk_lookup(net, tsk_portid);
+	if (!tsk)
+		return -EINVAL;
+
+	lock_sock(&tsk->sk);
+	err = __tipc_nl_list_sk_publ(skb, cb, tsk, &last_publ);
+	if (!err)
+		done = 1;
+	release_sock(&tsk->sk);
+	sock_put(&tsk->sk);
+
+	cb->args[0] = tsk_portid;
+	cb->args[1] = last_publ;
+	cb->args[2] = done;
+
+	return skb->len;
+}