1 files changed, 740 insertions, 144 deletions

diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index 7d423ee10897..75275c5cf929 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -35,17 +35,67 @@
  */
 
 #include "core.h"
-#include "port.h"
 #include "name_table.h"
 #include "node.h"
 #include "link.h"
 #include <linux/export.h>
+#include "config.h"
+#include "socket.h"
 
 #define SS_LISTENING	-1	/* socket is listening */
 #define SS_READY	-2	/* socket is connectionless */
 
-#define CONN_TIMEOUT_DEFAULT	8000	/* default connect timeout = 8s */
-#define TIPC_FWD_MSG	        1
+#define CONN_TIMEOUT_DEFAULT  8000	/* default connect timeout = 8s */
+#define CONN_PROBING_INTERVAL 3600000	/* [ms] => 1 h */
+#define TIPC_FWD_MSG	      1
+#define TIPC_CONN_OK          0
+#define TIPC_CONN_PROBING     1
+
+/**
+ * struct tipc_sock - TIPC socket structure
+ * @sk: socket - interacts with 'port' and with user via the socket API
+ * @connected: non-zero if port is currently connected to a peer port
+ * @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
+ * @ref: unique reference to port in TIPC object registry
+ * @phdr: preformatted message header used when sending messages
+ * @port_list: adjacent ports in TIPC's global list of ports
+ * @publications: list of publications for port
+ * @pub_count: total # of publications port has made during its lifetime
+ * @probing_state:
+ * @probing_interval:
+ * @timer:
+ * @port: port - interacts with 'sk' and with the rest of the TIPC stack
+ * @peer_name: the peer of the connection, if any
+ * @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
+ * @link_cong: non-zero if owner must sleep because of link congestion
+ * @sent_unacked: # messages sent by socket, and not yet acked by peer
+ * @rcv_unacked: # messages read by user, but not yet acked back to peer
+ */
+struct tipc_sock {
+	struct sock sk;
+	int connected;
+	u32 conn_type;
+	u32 conn_instance;
+	int published;
+	u32 max_pkt;
+	u32 ref;
+	struct tipc_msg phdr;
+	struct list_head sock_list;
+	struct list_head publications;
+	u32 pub_count;
+	u32 probing_state;
+	u32 probing_interval;
+	struct timer_list timer;
+	uint conn_timeout;
+	atomic_t dupl_rcvcnt;
+	bool link_cong;
+	uint sent_unacked;
+	uint rcv_unacked;
+};
 
 static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *skb);
 static void tipc_data_ready(struct sock *sk);
@@ -53,6 +103,16 @@ static void tipc_write_space(struct sock *sk);
 static int tipc_release(struct socket *sock);
 static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags);
 static int tipc_wait_for_sndmsg(struct socket *sock, long *timeo_p);
+static void tipc_sk_timeout(unsigned long ref);
+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 u32 tipc_sk_ref_acquire(struct tipc_sock *tsk);
+static void tipc_sk_ref_discard(u32 ref);
+static struct tipc_sock *tipc_sk_get(u32 ref);
+static struct tipc_sock *tipc_sk_get_next(u32 *ref);
+static void tipc_sk_put(struct tipc_sock *tsk);
 
 static const struct proto_ops packet_ops;
 static const struct proto_ops stream_ops;
@@ -106,24 +166,75 @@ static struct proto tipc_proto_kern;
  *   - port reference
  */
 
-#include "socket.h"
+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 int tsk_conn_cong(struct tipc_sock *tsk)
+{
+	return tsk->sent_unacked >= TIPC_FLOWCTRL_WIN;
+}
 
 /**
- * advance_rx_queue - discard first buffer in socket receive queue
+ * tsk_advance_rx_queue - discard first buffer in socket receive queue
  *
  * Caller must hold socket lock
  */
-static void advance_rx_queue(struct sock *sk)
+static void tsk_advance_rx_queue(struct sock *sk)
 {
 	kfree_skb(__skb_dequeue(&sk->sk_receive_queue));
 }
 
 /**
- * reject_rx_queue - reject all buffers in socket receive queue
+ * tsk_rej_rx_queue - reject all buffers in socket receive queue
  *
  * Caller must hold socket lock
  */
-static void reject_rx_queue(struct sock *sk)
+static void tsk_rej_rx_queue(struct sock *sk)
 {
 	struct sk_buff *buf;
 	u32 dnode;
@@ -134,6 +245,38 @@ static void reject_rx_queue(struct sock *sk)
 	}
 }
 
+/* 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)
+{
+	u32 peer_port = tsk_peer_port(tsk);
+	u32 orig_node;
+	u32 peer_node;
+
+	if (unlikely(!tsk->connected))
+		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 == tipc_own_addr))
+		return true;
+
+	if (!peer_node && (orig_node == tipc_own_addr))
+		return true;
+
+	return false;
+}
+
 /**
  * tipc_sk_create - create a TIPC socket
  * @net: network namespace (must be default network)
@@ -153,7 +296,7 @@ static int tipc_sk_create(struct net *net, struct socket *sock,
 	socket_state state;
 	struct sock *sk;
 	struct tipc_sock *tsk;
-	struct tipc_port *port;
+	struct tipc_msg *msg;
 	u32 ref;
 
 	/* Validate arguments */
@@ -188,20 +331,24 @@ static int tipc_sk_create(struct net *net, struct socket *sock,
 		return -ENOMEM;
 
 	tsk = tipc_sk(sk);
-	port = &tsk->port;
-
-	ref = tipc_port_init(port, TIPC_LOW_IMPORTANCE);
+	ref = tipc_sk_ref_acquire(tsk);
 	if (!ref) {
-		pr_warn("Socket registration failed, ref. table exhausted\n");
-		sk_free(sk);
+		pr_warn("Socket create failed; reference table exhausted\n");
 		return -ENOMEM;
 	}
+	tsk->max_pkt = MAX_PKT_DEFAULT;
+	tsk->ref = ref;
+	INIT_LIST_HEAD(&tsk->publications);
+	msg = &tsk->phdr;
+	tipc_msg_init(msg, TIPC_LOW_IMPORTANCE, TIPC_NAMED_MSG,
+		      NAMED_H_SIZE, 0);
+	msg_set_origport(msg, ref);
 
 	/* Finish initializing socket data structures */
 	sock->ops = ops;
 	sock->state = state;
-
 	sock_init_data(sock, sk);
+	k_init_timer(&tsk->timer, (Handler)tipc_sk_timeout, ref);
 	sk->sk_backlog_rcv = tipc_backlog_rcv;
 	sk->sk_rcvbuf = sysctl_tipc_rmem[1];
 	sk->sk_data_ready = tipc_data_ready;
@@ -209,12 +356,11 @@ static int tipc_sk_create(struct net *net, struct socket *sock,
 	tsk->conn_timeout = CONN_TIMEOUT_DEFAULT;
 	tsk->sent_unacked = 0;
 	atomic_set(&tsk->dupl_rcvcnt, 0);
-	tipc_port_unlock(port);
 
 	if (sock->state == SS_READY) {
-		tipc_port_set_unreturnable(port, true);
+		tsk_set_unreturnable(tsk, true);
 		if (sock->type == SOCK_DGRAM)
-			tipc_port_set_unreliable(port, true);
+			tsk_set_unreliable(tsk, true);
 	}
 	return 0;
 }
@@ -308,7 +454,6 @@ static int tipc_release(struct socket *sock)
 {
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk;
-	struct tipc_port *port;
 	struct sk_buff *buf;
 	u32 dnode;
 
@@ -320,13 +465,13 @@ static int tipc_release(struct socket *sock)
 		return 0;
 
 	tsk = tipc_sk(sk);
-	port = &tsk->port;
 	lock_sock(sk);
 
 	/*
 	 * Reject all unreceived messages, except on an active connection
 	 * (which disconnects locally & sends a 'FIN+' to peer)
 	 */
+	dnode = tsk_peer_node(tsk);
 	while (sock->state != SS_DISCONNECTING) {
 		buf = __skb_dequeue(&sk->sk_receive_queue);
 		if (buf == NULL)
@@ -337,17 +482,27 @@ static int tipc_release(struct socket *sock)
 			if ((sock->state == SS_CONNECTING) ||
 			    (sock->state == SS_CONNECTED)) {
 				sock->state = SS_DISCONNECTING;
-				tipc_port_disconnect(port->ref);
+				tsk->connected = 0;
+				tipc_node_remove_conn(dnode, tsk->ref);
 			}
 			if (tipc_msg_reverse(buf, &dnode, TIPC_ERR_NO_PORT))
 				tipc_link_xmit(buf, dnode, 0);
 		}
 	}
 
-	/* Destroy TIPC port; also disconnects an active connection and
-	 * sends a 'FIN-' to peer.
-	 */
-	tipc_port_destroy(port);
+	tipc_sk_withdraw(tsk, 0, NULL);
+	tipc_sk_ref_discard(tsk->ref);
+	k_cancel_timer(&tsk->timer);
+	if (tsk->connected) {
+		buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
+				      SHORT_H_SIZE, 0, dnode, tipc_own_addr,
+				      tsk_peer_port(tsk),
+				      tsk->ref, TIPC_ERR_NO_PORT);
+		if (buf)
+			tipc_link_xmit(buf, dnode, tsk->ref);
+		tipc_node_remove_conn(dnode, tsk->ref);
+	}
+	k_term_timer(&tsk->timer);
 
 	/* Discard any remaining (connection-based) messages in receive queue */
 	__skb_queue_purge(&sk->sk_receive_queue);
@@ -355,7 +510,6 @@ static int tipc_release(struct socket *sock)
 	/* Reject any messages that accumulated in backlog queue */
 	sock->state = SS_DISCONNECTING;
 	release_sock(sk);
-
 	sock_put(sk);
 	sock->sk = NULL;
 
@@ -387,7 +541,7 @@ static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
 
 	lock_sock(sk);
 	if (unlikely(!uaddr_len)) {
-		res = tipc_withdraw(&tsk->port, 0, NULL);
+		res = tipc_sk_withdraw(tsk, 0, NULL);
 		goto exit;
 	}
 
@@ -415,8 +569,8 @@ static int tipc_bind(struct socket *sock, struct sockaddr *uaddr,
 	}
 
 	res = (addr->scope > 0) ?
-		tipc_publish(&tsk->port, addr->scope, &addr->addr.nameseq) :
-		tipc_withdraw(&tsk->port, -addr->scope, &addr->addr.nameseq);
+		tipc_sk_publish(tsk, addr->scope, &addr->addr.nameseq) :
+		tipc_sk_withdraw(tsk, -addr->scope, &addr->addr.nameseq);
 exit:
 	release_sock(sk);
 	return res;
@@ -446,10 +600,10 @@ static int tipc_getname(struct socket *sock, struct sockaddr *uaddr,
 		if ((sock->state != SS_CONNECTED) &&
 			((peer != 2) || (sock->state != SS_DISCONNECTING)))
 			return -ENOTCONN;
-		addr->addr.id.ref = tipc_port_peerport(&tsk->port);
-		addr->addr.id.node = tipc_port_peernode(&tsk->port);
+		addr->addr.id.ref = tsk_peer_port(tsk);
+		addr->addr.id.node = tsk_peer_node(tsk);
 	} else {
-		addr->addr.id.ref = tsk->port.ref;
+		addr->addr.id.ref = tsk->ref;
 		addr->addr.id.node = tipc_own_addr;
 	}
 
@@ -518,7 +672,7 @@ static unsigned int tipc_poll(struct file *file, struct socket *sock,
 		break;
 	case SS_READY:
 	case SS_CONNECTED:
-		if (!tsk->link_cong && !tipc_sk_conn_cong(tsk))
+		if (!tsk->link_cong && !tsk_conn_cong(tsk))
 			mask |= POLLOUT;
 		/* fall thru' */
 	case SS_CONNECTING:
@@ -549,7 +703,7 @@ static int tipc_sendmcast(struct  socket *sock, struct tipc_name_seq *seq,
 			  struct iovec *iov, size_t dsz, long timeo)
 {
 	struct sock *sk = sock->sk;
-	struct tipc_msg *mhdr = &tipc_sk(sk)->port.phdr;
+	struct tipc_msg *mhdr = &tipc_sk(sk)->phdr;
 	struct sk_buff *buf;
 	uint mtu;
 	int rc;
@@ -579,6 +733,7 @@ new_mtu:
 			goto new_mtu;
 		if (rc != -ELINKCONG)
 			break;
+		tipc_sk(sk)->link_cong = 1;
 		rc = tipc_wait_for_sndmsg(sock, &timeo);
 		if (rc)
 			kfree_skb_list(buf);
@@ -638,20 +793,19 @@ static int tipc_sk_proto_rcv(struct tipc_sock *tsk, u32 *dnode,
 			     struct sk_buff *buf)
 {
 	struct tipc_msg *msg = buf_msg(buf);
-	struct tipc_port *port = &tsk->port;
 	int conn_cong;
 
 	/* Ignore if connection cannot be validated: */
-	if (!port->connected || !tipc_port_peer_msg(port, msg))
+	if (!tsk_peer_msg(tsk, msg))
 		goto exit;
 
-	port->probing_state = TIPC_CONN_OK;
+	tsk->probing_state = TIPC_CONN_OK;
 
 	if (msg_type(msg) == CONN_ACK) {
-		conn_cong = tipc_sk_conn_cong(tsk);
+		conn_cong = tsk_conn_cong(tsk);
 		tsk->sent_unacked -= msg_msgcnt(msg);
 		if (conn_cong)
-			tipc_sock_wakeup(tsk);
+			tsk->sk.sk_write_space(&tsk->sk);
 	} else if (msg_type(msg) == CONN_PROBE) {
 		if (!tipc_msg_reverse(buf, dnode, TIPC_OK))
 			return TIPC_OK;
@@ -742,8 +896,7 @@ static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
 	DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk = tipc_sk(sk);
-	struct tipc_port *port = &tsk->port;
-	struct tipc_msg *mhdr = &port->phdr;
+	struct tipc_msg *mhdr = &tsk->phdr;
 	struct iovec *iov = m->msg_iov;
 	u32 dnode, dport;
 	struct sk_buff *buf;
@@ -774,13 +927,13 @@ static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
 			rc = -EISCONN;
 			goto exit;
 		}
-		if (tsk->port.published) {
+		if (tsk->published) {
 			rc = -EOPNOTSUPP;
 			goto exit;
 		}
 		if (dest->addrtype == TIPC_ADDR_NAME) {
-			tsk->port.conn_type = dest->addr.name.name.type;
-			tsk->port.conn_instance = dest->addr.name.name.instance;
+			tsk->conn_type = dest->addr.name.name.type;
+			tsk->conn_instance = dest->addr.name.name.instance;
 		}
 	}
 	rc = dest_name_check(dest, m);
@@ -820,13 +973,14 @@ static int tipc_sendmsg(struct kiocb *iocb, struct socket *sock,
 	}
 
 new_mtu:
-	mtu = tipc_node_get_mtu(dnode, tsk->port.ref);
+	mtu = tipc_node_get_mtu(dnode, tsk->ref);
 	rc = tipc_msg_build(mhdr, iov, 0, dsz, mtu, &buf);
 	if (rc < 0)
 		goto exit;
 
 	do {
-		rc = tipc_link_xmit(buf, dnode, tsk->port.ref);
+		TIPC_SKB_CB(buf)->wakeup_pending = tsk->link_cong;
+		rc = tipc_link_xmit(buf, dnode, tsk->ref);
 		if (likely(rc >= 0)) {
 			if (sock->state != SS_READY)
 				sock->state = SS_CONNECTING;
@@ -835,10 +989,9 @@ new_mtu:
 		}
 		if (rc == -EMSGSIZE)
 			goto new_mtu;
-
 		if (rc != -ELINKCONG)
 			break;
-
+		tsk->link_cong = 1;
 		rc = tipc_wait_for_sndmsg(sock, &timeo);
 		if (rc)
 			kfree_skb_list(buf);
@@ -873,8 +1026,8 @@ static int tipc_wait_for_sndpkt(struct socket *sock, long *timeo_p)
 		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
 		done = sk_wait_event(sk, timeo_p,
 				     (!tsk->link_cong &&
-				      !tipc_sk_conn_cong(tsk)) ||
-				     !tsk->port.connected);
+				      !tsk_conn_cong(tsk)) ||
+				     !tsk->connected);
 		finish_wait(sk_sleep(sk), &wait);
 	} while (!done);
 	return 0;
@@ -897,11 +1050,10 @@ static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
 {
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk = tipc_sk(sk);
-	struct tipc_port *port = &tsk->port;
-	struct tipc_msg *mhdr = &port->phdr;
+	struct tipc_msg *mhdr = &tsk->phdr;
 	struct sk_buff *buf;
 	DECLARE_SOCKADDR(struct sockaddr_tipc *, dest, m->msg_name);
-	u32 ref = port->ref;
+	u32 ref = tsk->ref;
 	int rc = -EINVAL;
 	long timeo;
 	u32 dnode;
@@ -929,16 +1081,16 @@ static int tipc_send_stream(struct kiocb *iocb, struct socket *sock,
 	}
 
 	timeo = sock_sndtimeo(sk, m->msg_flags & MSG_DONTWAIT);
-	dnode = tipc_port_peernode(port);
+	dnode = tsk_peer_node(tsk);
 
 next:
-	mtu = port->max_pkt;
+	mtu = tsk->max_pkt;
 	send = min_t(uint, dsz - sent, TIPC_MAX_USER_MSG_SIZE);
 	rc = tipc_msg_build(mhdr, m->msg_iov, sent, send, mtu, &buf);
 	if (unlikely(rc < 0))
 		goto exit;
 	do {
-		if (likely(!tipc_sk_conn_cong(tsk))) {
+		if (likely(!tsk_conn_cong(tsk))) {
 			rc = tipc_link_xmit(buf, dnode, ref);
 			if (likely(!rc)) {
 				tsk->sent_unacked++;
@@ -948,11 +1100,12 @@ next:
 				goto next;
 			}
 			if (rc == -EMSGSIZE) {
-				port->max_pkt = tipc_node_get_mtu(dnode, ref);
+				tsk->max_pkt = tipc_node_get_mtu(dnode, ref);
 				goto next;
 			}
 			if (rc != -ELINKCONG)
 				break;
+			tsk->link_cong = 1;
 		}
 		rc = tipc_wait_for_sndpkt(sock, &timeo);
 		if (rc)
@@ -984,29 +1137,25 @@ static int tipc_send_packet(struct kiocb *iocb, struct socket *sock,
 	return tipc_send_stream(iocb, sock, m, dsz);
 }
 
-/**
- * auto_connect - complete connection setup to a remote port
- * @tsk: tipc socket structure
- * @msg: peer's response message
- *
- * Returns 0 on success, errno otherwise
+/* tipc_sk_finish_conn - complete the setup of a connection
  */
-static int auto_connect(struct tipc_sock *tsk, struct tipc_msg *msg)
+static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
+				u32 peer_node)
 {
-	struct tipc_port *port = &tsk->port;
-	struct socket *sock = tsk->sk.sk_socket;
-	struct tipc_portid peer;
-
-	peer.ref = msg_origport(msg);
-	peer.node = msg_orignode(msg);
-
-	__tipc_port_connect(port->ref, port, &peer);
-
-	if (msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)
-		return -EINVAL;
-	msg_set_importance(&port->phdr, (u32)msg_importance(msg));
-	sock->state = SS_CONNECTED;
-	return 0;
+	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);
+
+	tsk->probing_interval = CONN_PROBING_INTERVAL;
+	tsk->probing_state = TIPC_CONN_OK;
+	tsk->connected = 1;
+	k_start_timer(&tsk->timer, tsk->probing_interval);
+	tipc_node_add_conn(peer_node, tsk->ref, peer_port);
+	tsk->max_pkt = tipc_node_get_mtu(peer_node, tsk->ref);
 }
 
 /**
@@ -1033,17 +1182,17 @@ static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
 }
 
 /**
- * anc_data_recv - optionally capture ancillary data for received message
+ * tipc_sk_anc_data_recv - optionally capture ancillary data for received message
  * @m: descriptor for message info
  * @msg: received message header
- * @tport: TIPC port associated with message
+ * @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 anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
-			 struct tipc_port *tport)
+static int tipc_sk_anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
+				 struct tipc_sock *tsk)
 {
 	u32 anc_data[3];
 	u32 err;
@@ -1086,10 +1235,10 @@ static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
 		anc_data[2] = msg_nameupper(msg);
 		break;
 	case TIPC_CONN_MSG:
-		has_name = (tport->conn_type != 0);
-		anc_data[0] = tport->conn_type;
-		anc_data[1] = tport->conn_instance;
-		anc_data[2] = tport->conn_instance;
+		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;
@@ -1103,6 +1252,24 @@ static int anc_data_recv(struct msghdr *m, struct tipc_msg *msg,
 	return 0;
 }
 
+static void tipc_sk_send_ack(struct tipc_sock *tsk, uint ack)
+{
+	struct sk_buff *buf = NULL;
+	struct tipc_msg *msg;
+	u32 peer_port = tsk_peer_port(tsk);
+	u32 dnode = tsk_peer_node(tsk);
+
+	if (!tsk->connected)
+		return;
+	buf = tipc_msg_create(CONN_MANAGER, CONN_ACK, INT_H_SIZE, 0, dnode,
+			      tipc_own_addr, peer_port, tsk->ref, TIPC_OK);
+	if (!buf)
+		return;
+	msg = buf_msg(buf);
+	msg_set_msgcnt(msg, ack);
+	tipc_link_xmit(buf, dnode, msg_link_selector(msg));
+}
+
 static int tipc_wait_for_rcvmsg(struct socket *sock, long *timeop)
 {
 	struct sock *sk = sock->sk;
@@ -1153,7 +1320,6 @@ static int tipc_recvmsg(struct kiocb *iocb, struct socket *sock,
 {
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk = tipc_sk(sk);
-	struct tipc_port *port = &tsk->port;
 	struct sk_buff *buf;
 	struct tipc_msg *msg;
 	long timeo;
@@ -1188,7 +1354,7 @@ restart:
 
 	/* Discard an empty non-errored message & try again */
 	if ((!sz) && (!err)) {
-		advance_rx_queue(sk);
+		tsk_advance_rx_queue(sk);
 		goto restart;
 	}
 
@@ -1196,7 +1362,7 @@ restart:
 	set_orig_addr(m, msg);
 
 	/* Capture ancillary data (optional) */
-	res = anc_data_recv(m, msg, port);
+	res = tipc_sk_anc_data_recv(m, msg, tsk);
 	if (res)
 		goto exit;
 
@@ -1223,10 +1389,10 @@ restart:
 	if (likely(!(flags & MSG_PEEK))) {
 		if ((sock->state != SS_READY) &&
 		    (++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
-			tipc_acknowledge(port->ref, tsk->rcv_unacked);
+			tipc_sk_send_ack(tsk, tsk->rcv_unacked);
 			tsk->rcv_unacked = 0;
 		}
-		advance_rx_queue(sk);
+		tsk_advance_rx_queue(sk);
 	}
 exit:
 	release_sock(sk);
@@ -1250,7 +1416,6 @@ static int tipc_recv_stream(struct kiocb *iocb, struct socket *sock,
 {
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk = tipc_sk(sk);
-	struct tipc_port *port = &tsk->port;
 	struct sk_buff *buf;
 	struct tipc_msg *msg;
 	long timeo;
@@ -1288,14 +1453,14 @@ restart:
 
 	/* Discard an empty non-errored message & try again */
 	if ((!sz) && (!err)) {
-		advance_rx_queue(sk);
+		tsk_advance_rx_queue(sk);
 		goto restart;
 	}
 
 	/* Optionally capture sender's address & ancillary data of first msg */
 	if (sz_copied == 0) {
 		set_orig_addr(m, msg);
-		res = anc_data_recv(m, msg, port);
+		res = tipc_sk_anc_data_recv(m, msg, tsk);
 		if (res)
 			goto exit;
 	}
@@ -1334,10 +1499,10 @@ restart:
 	/* Consume received message (optional) */
 	if (likely(!(flags & MSG_PEEK))) {
 		if (unlikely(++tsk->rcv_unacked >= TIPC_CONNACK_INTV)) {
-			tipc_acknowledge(port->ref, tsk->rcv_unacked);
+			tipc_sk_send_ack(tsk, tsk->rcv_unacked);
 			tsk->rcv_unacked = 0;
 		}
-		advance_rx_queue(sk);
+		tsk_advance_rx_queue(sk);
 	}
 
 	/* Loop around if more data is required */
@@ -1396,12 +1561,9 @@ static void tipc_data_ready(struct sock *sk)
 static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
 {
 	struct sock *sk = &tsk->sk;
-	struct tipc_port *port = &tsk->port;
 	struct socket *sock = sk->sk_socket;
 	struct tipc_msg *msg = buf_msg(*buf);
-
 	int retval = -TIPC_ERR_NO_PORT;
-	int res;
 
 	if (msg_mcast(msg))
 		return retval;
@@ -1409,16 +1571,23 @@ static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
 	switch ((int)sock->state) {
 	case SS_CONNECTED:
 		/* Accept only connection-based messages sent by peer */
-		if (msg_connected(msg) && tipc_port_peer_msg(port, msg)) {
+		if (tsk_peer_msg(tsk, msg)) {
 			if (unlikely(msg_errcode(msg))) {
 				sock->state = SS_DISCONNECTING;
-				__tipc_port_disconnect(port);
+				tsk->connected = 0;
+				/* let timer expire on it's own */
+				tipc_node_remove_conn(tsk_peer_node(tsk),
+						      tsk->ref);
 			}
 			retval = TIPC_OK;
 		}
 		break;
 	case SS_CONNECTING:
 		/* Accept only ACK or NACK message */
+
+		if (unlikely(!msg_connected(msg)))
+			break;
+
 		if (unlikely(msg_errcode(msg))) {
 			sock->state = SS_DISCONNECTING;
 			sk->sk_err = ECONNREFUSED;
@@ -1426,17 +1595,17 @@ static int filter_connect(struct tipc_sock *tsk, struct sk_buff **buf)
 			break;
 		}
 
-		if (unlikely(!msg_connected(msg)))
-			break;
-
-		res = auto_connect(tsk, msg);
-		if (res) {
+		if (unlikely(msg_importance(msg) > TIPC_CRITICAL_IMPORTANCE)) {
 			sock->state = SS_DISCONNECTING;
-			sk->sk_err = -res;
+			sk->sk_err = EINVAL;
 			retval = TIPC_OK;
 			break;
 		}
 
+		tipc_sk_finish_conn(tsk, msg_origport(msg), msg_orignode(msg));
+		msg_set_importance(&tsk->phdr, msg_importance(msg));
+		sock->state = SS_CONNECTED;
+
 		/* If an incoming message is an 'ACK-', it should be
 		 * discarded here because it doesn't contain useful
 		 * data. In addition, we should try to wake up
@@ -1518,6 +1687,13 @@ static int filter_rcv(struct sock *sk, struct sk_buff *buf)
 	if (unlikely(msg_user(msg) == CONN_MANAGER))
 		return tipc_sk_proto_rcv(tsk, &onode, buf);
 
+	if (unlikely(msg_user(msg) == SOCK_WAKEUP)) {
+		kfree_skb(buf);
+		tsk->link_cong = 0;
+		sk->sk_write_space(sk);
+		return TIPC_OK;
+	}
+
 	/* Reject message if it is wrong sort of message for socket */
 	if (msg_type(msg) > TIPC_DIRECT_MSG)
 		return -TIPC_ERR_NO_PORT;
@@ -1585,7 +1761,6 @@ static int tipc_backlog_rcv(struct sock *sk, struct sk_buff *buf)
 int tipc_sk_rcv(struct sk_buff *buf)
 {
 	struct tipc_sock *tsk;
-	struct tipc_port *port;
 	struct sock *sk;
 	u32 dport = msg_destport(buf_msg(buf));
 	int rc = TIPC_OK;
@@ -1593,13 +1768,11 @@ int tipc_sk_rcv(struct sk_buff *buf)
 	u32 dnode;
 
 	/* Validate destination and message */
-	port = tipc_port_lock(dport);
-	if (unlikely(!port)) {
+	tsk = tipc_sk_get(dport);
+	if (unlikely(!tsk)) {
 		rc = tipc_msg_eval(buf, &dnode);
 		goto exit;
 	}
-
-	tsk = tipc_port_to_sock(port);
 	sk = &tsk->sk;
 
 	/* Queue message */
@@ -1615,8 +1788,7 @@ int tipc_sk_rcv(struct sk_buff *buf)
 			rc = -TIPC_ERR_OVERLOAD;
 	}
 	bh_unlock_sock(sk);
-	tipc_port_unlock(port);
-
+	tipc_sk_put(tsk);
 	if (likely(!rc))
 		return 0;
 exit:
@@ -1803,10 +1975,8 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 {
 	struct sock *new_sk, *sk = sock->sk;
 	struct sk_buff *buf;
-	struct tipc_port *new_port;
+	struct tipc_sock *new_tsock;
 	struct tipc_msg *msg;
-	struct tipc_portid peer;
-	u32 new_ref;
 	long timeo;
 	int res;
 
@@ -1828,8 +1998,7 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 		goto exit;
 
 	new_sk = new_sock->sk;
-	new_port = &tipc_sk(new_sk)->port;
-	new_ref = new_port->ref;
+	new_tsock = tipc_sk(new_sk);
 	msg = buf_msg(buf);
 
 	/* we lock on new_sk; but lockdep sees the lock on sk */
@@ -1839,18 +2008,16 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 	 * Reject any stray messages received by new socket
 	 * before the socket lock was taken (very, very unlikely)
 	 */
-	reject_rx_queue(new_sk);
+	tsk_rej_rx_queue(new_sk);
 
 	/* Connect new socket to it's peer */
-	peer.ref = msg_origport(msg);
-	peer.node = msg_orignode(msg);
-	tipc_port_connect(new_ref, &peer);
+	tipc_sk_finish_conn(new_tsock, msg_origport(msg), msg_orignode(msg));
 	new_sock->state = SS_CONNECTED;
 
-	tipc_port_set_importance(new_port, msg_importance(msg));
+	tsk_set_importance(new_tsock, msg_importance(msg));
 	if (msg_named(msg)) {
-		new_port->conn_type = msg_nametype(msg);
-		new_port->conn_instance = msg_nameinst(msg);
+		new_tsock->conn_type = msg_nametype(msg);
+		new_tsock->conn_instance = msg_nameinst(msg);
 	}
 
 	/*
@@ -1860,7 +2027,7 @@ static int tipc_accept(struct socket *sock, struct socket *new_sock, int flags)
 	if (!msg_data_sz(msg)) {
 		struct msghdr m = {NULL,};
 
-		advance_rx_queue(sk);
+		tsk_advance_rx_queue(sk);
 		tipc_send_packet(NULL, new_sock, &m, 0);
 	} else {
 		__skb_dequeue(&sk->sk_receive_queue);
@@ -1886,9 +2053,8 @@ static int tipc_shutdown(struct socket *sock, int how)
 {
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk = tipc_sk(sk);
-	struct tipc_port *port = &tsk->port;
 	struct sk_buff *buf;
-	u32 peer;
+	u32 dnode;
 	int res;
 
 	if (how != SHUT_RDWR)
@@ -1908,15 +2074,21 @@ restart:
 				kfree_skb(buf);
 				goto restart;
 			}
-			tipc_port_disconnect(port->ref);
-			if (tipc_msg_reverse(buf, &peer, TIPC_CONN_SHUTDOWN))
-				tipc_link_xmit(buf, peer, 0);
+			if (tipc_msg_reverse(buf, &dnode, TIPC_CONN_SHUTDOWN))
+				tipc_link_xmit(buf, dnode, tsk->ref);
+			tipc_node_remove_conn(dnode, tsk->ref);
 		} else {
-			tipc_port_shutdown(port->ref);
+			dnode = tsk_peer_node(tsk);
+			buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE,
+					      TIPC_CONN_MSG, SHORT_H_SIZE,
+					      0, dnode, tipc_own_addr,
+					      tsk_peer_port(tsk),
+					      tsk->ref, TIPC_CONN_SHUTDOWN);
+			tipc_link_xmit(buf, dnode, tsk->ref);
 		}
-
+		tsk->connected = 0;
 		sock->state = SS_DISCONNECTING;
-
+		tipc_node_remove_conn(dnode, tsk->ref);
 		/* fall through */
 
 	case SS_DISCONNECTING:
@@ -1937,6 +2109,432 @@ restart:
 	return res;
 }
 
+static void tipc_sk_timeout(unsigned long ref)
+{
+	struct tipc_sock *tsk;
+	struct sock *sk;
+	struct sk_buff *buf = NULL;
+	u32 peer_port, peer_node;
+
+	tsk = tipc_sk_get(ref);
+	if (!tsk)
+		return;
+
+	sk = &tsk->sk;
+	bh_lock_sock(sk);
+	if (!tsk->connected) {
+		bh_unlock_sock(sk);
+		goto exit;
+	}
+	peer_port = tsk_peer_port(tsk);
+	peer_node = tsk_peer_node(tsk);
+
+	if (tsk->probing_state == TIPC_CONN_PROBING) {
+		/* Previous probe not answered -> self abort */
+		buf = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
+				      SHORT_H_SIZE, 0, tipc_own_addr,
+				      peer_node, ref, peer_port,
+				      TIPC_ERR_NO_PORT);
+	} else {
+		buf = tipc_msg_create(CONN_MANAGER, CONN_PROBE, INT_H_SIZE,
+				      0, peer_node, tipc_own_addr,
+				      peer_port, ref, TIPC_OK);
+		tsk->probing_state = TIPC_CONN_PROBING;
+		k_start_timer(&tsk->timer, tsk->probing_interval);
+	}
+	bh_unlock_sock(sk);
+	if (buf)
+		tipc_link_xmit(buf, peer_node, ref);
+exit:
+	tipc_sk_put(tsk);
+}
+
+static int tipc_sk_publish(struct tipc_sock *tsk, uint scope,
+			   struct tipc_name_seq const *seq)
+{
+	struct publication *publ;
+	u32 key;
+
+	if (tsk->connected)
+		return -EINVAL;
+	key = tsk->ref + tsk->pub_count + 1;
+	if (key == tsk->ref)
+		return -EADDRINUSE;
+
+	publ = tipc_nametbl_publish(seq->type, seq->lower, seq->upper,
+				    scope, tsk->ref, key);
+	if (unlikely(!publ))
+		return -EINVAL;
+
+	list_add(&publ->pport_list, &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 publication *publ;
+	struct publication *safe;
+	int rc = -EINVAL;
+
+	list_for_each_entry_safe(publ, safe, &tsk->publications, pport_list) {
+		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(publ->type, publ->lower,
+					      publ->ref, publ->key);
+			rc = 0;
+			break;
+		}
+		tipc_nametbl_withdraw(publ->type, publ->lower,
+				      publ->ref, publ->key);
+		rc = 0;
+	}
+	if (list_empty(&tsk->publications))
+		tsk->published = 0;
+	return rc;
+}
+
+static int tipc_sk_show(struct tipc_sock *tsk, char *buf,
+			int len, int full_id)
+{
+	struct publication *publ;
+	int ret;
+
+	if (full_id)
+		ret = tipc_snprintf(buf, len, "<%u.%u.%u:%u>:",
+				    tipc_zone(tipc_own_addr),
+				    tipc_cluster(tipc_own_addr),
+				    tipc_node(tipc_own_addr), tsk->ref);
+	else
+		ret = tipc_snprintf(buf, len, "%-10u:", tsk->ref);
+
+	if (tsk->connected) {
+		u32 dport = tsk_peer_port(tsk);
+		u32 destnode = tsk_peer_node(tsk);
+
+		ret += tipc_snprintf(buf + ret, len - ret,
+				     " connected to <%u.%u.%u:%u>",
+				     tipc_zone(destnode),
+				     tipc_cluster(destnode),
+				     tipc_node(destnode), dport);
+		if (tsk->conn_type != 0)
+			ret += tipc_snprintf(buf + ret, len - ret,
+					     " via {%u,%u}", tsk->conn_type,
+					     tsk->conn_instance);
+	} else if (tsk->published) {
+		ret += tipc_snprintf(buf + ret, len - ret, " bound to");
+		list_for_each_entry(publ, &tsk->publications, pport_list) {
+			if (publ->lower == publ->upper)
+				ret += tipc_snprintf(buf + ret, len - ret,
+						     " {%u,%u}", publ->type,
+						     publ->lower);
+			else
+				ret += tipc_snprintf(buf + ret, len - ret,
+						     " {%u,%u,%u}", publ->type,
+						     publ->lower, publ->upper);
+		}
+	}
+	ret += tipc_snprintf(buf + ret, len - ret, "\n");
+	return ret;
+}
+
+struct sk_buff *tipc_sk_socks_show(void)
+{
+	struct sk_buff *buf;
+	struct tlv_desc *rep_tlv;
+	char *pb;
+	int pb_len;
+	struct tipc_sock *tsk;
+	int str_len = 0;
+	u32 ref = 0;
+
+	buf = tipc_cfg_reply_alloc(TLV_SPACE(ULTRA_STRING_MAX_LEN));
+	if (!buf)
+		return NULL;
+	rep_tlv = (struct tlv_desc *)buf->data;
+	pb = TLV_DATA(rep_tlv);
+	pb_len = ULTRA_STRING_MAX_LEN;
+
+	tsk = tipc_sk_get_next(&ref);
+	for (; tsk; tsk = tipc_sk_get_next(&ref)) {
+		lock_sock(&tsk->sk);
+		str_len += tipc_sk_show(tsk, pb + str_len,
+					pb_len - str_len, 0);
+		release_sock(&tsk->sk);
+		tipc_sk_put(tsk);
+	}
+	str_len += 1;	/* for "\0" */
+	skb_put(buf, TLV_SPACE(str_len));
+	TLV_SET(rep_tlv, TIPC_TLV_ULTRA_STRING, NULL, str_len);
+
+	return buf;
+}
+
+/* tipc_sk_reinit: set non-zero address in all existing sockets
+ *                 when we go from standalone to network mode.
+ */
+void tipc_sk_reinit(void)
+{
+	struct tipc_msg *msg;
+	u32 ref = 0;
+	struct tipc_sock *tsk = tipc_sk_get_next(&ref);
+
+	for (; tsk; tsk = tipc_sk_get_next(&ref)) {
+		lock_sock(&tsk->sk);
+		msg = &tsk->phdr;
+		msg_set_prevnode(msg, tipc_own_addr);
+		msg_set_orignode(msg, tipc_own_addr);
+		release_sock(&tsk->sk);
+		tipc_sk_put(tsk);
+	}
+}
+
+/**
+ * struct reference - TIPC socket reference entry
+ * @tsk: pointer to socket associated with reference entry
+ * @ref: reference value for socket (combines instance & array index info)
+ */
+struct reference {
+	struct tipc_sock *tsk;
+	u32 ref;
+};
+
+/**
+ * struct tipc_ref_table - table of TIPC socket reference entries
+ * @entries: pointer to array of reference entries
+ * @capacity: array index of first unusable entry
+ * @init_point: array index of first uninitialized entry
+ * @first_free: array index of first unused socket reference entry
+ * @last_free: array index of last unused socket reference entry
+ * @index_mask: bitmask for array index portion of reference values
+ * @start_mask: initial value for instance value portion of reference values
+ */
+struct ref_table {
+	struct reference *entries;
+	u32 capacity;
+	u32 init_point;
+	u32 first_free;
+	u32 last_free;
+	u32 index_mask;
+	u32 start_mask;
+};
+
+/* Socket reference table consists of 2**N entries.
+ *
+ * State	Socket ptr	Reference
+ * -----        ----------      ---------
+ * In use        non-NULL       XXXX|own index
+ *				(XXXX changes each time entry is acquired)
+ * Free            NULL         YYYY|next free index
+ *				(YYYY is one more than last used XXXX)
+ * Uninitialized   NULL         0
+ *
+ * Entry 0 is not used; this allows index 0 to denote the end of the free list.
+ *
+ * Note that a reference value of 0 does not necessarily indicate that an
+ * entry is uninitialized, since the last entry in the free list could also
+ * have a reference value of 0 (although this is unlikely).
+ */
+
+static struct ref_table tipc_ref_table;
+
+static DEFINE_RWLOCK(ref_table_lock);
+
+/**
+ * tipc_ref_table_init - create reference table for sockets
+ */
+int tipc_sk_ref_table_init(u32 req_sz, u32 start)
+{
+	struct reference *table;
+	u32 actual_sz;
+
+	/* account for unused entry, then round up size to a power of 2 */
+
+	req_sz++;
+	for (actual_sz = 16; actual_sz < req_sz; actual_sz <<= 1) {
+		/* do nothing */
+	};
+
+	/* allocate table & mark all entries as uninitialized */
+	table = vzalloc(actual_sz * sizeof(struct reference));
+	if (table == NULL)
+		return -ENOMEM;
+
+	tipc_ref_table.entries = table;
+	tipc_ref_table.capacity = req_sz;
+	tipc_ref_table.init_point = 1;
+	tipc_ref_table.first_free = 0;
+	tipc_ref_table.last_free = 0;
+	tipc_ref_table.index_mask = actual_sz - 1;
+	tipc_ref_table.start_mask = start & ~tipc_ref_table.index_mask;
+
+	return 0;
+}
+
+/**
+ * tipc_ref_table_stop - destroy reference table for sockets
+ */
+void tipc_sk_ref_table_stop(void)
+{
+	if (!tipc_ref_table.entries)
+		return;
+	vfree(tipc_ref_table.entries);
+	tipc_ref_table.entries = NULL;
+}
+
+/* tipc_ref_acquire - create reference to a socket
+ *
+ * Register an socket pointer in the reference table.
+ * Returns a unique reference value that is used from then on to retrieve the
+ * socket pointer, or to determine if the socket has been deregistered.
+ */
+u32 tipc_sk_ref_acquire(struct tipc_sock *tsk)
+{
+	u32 index;
+	u32 index_mask;
+	u32 next_plus_upper;
+	u32 ref = 0;
+	struct reference *entry;
+
+	if (unlikely(!tsk)) {
+		pr_err("Attempt to acquire ref. to non-existent obj\n");
+		return 0;
+	}
+	if (unlikely(!tipc_ref_table.entries)) {
+		pr_err("Ref. table not found in acquisition attempt\n");
+		return 0;
+	}
+
+	/* Take a free entry, if available; otherwise initialize a new one */
+	write_lock_bh(&ref_table_lock);
+	index = tipc_ref_table.first_free;
+	entry = &tipc_ref_table.entries[index];
+
+	if (likely(index)) {
+		index = tipc_ref_table.first_free;
+		entry = &tipc_ref_table.entries[index];
+		index_mask = tipc_ref_table.index_mask;
+		next_plus_upper = entry->ref;
+		tipc_ref_table.first_free = next_plus_upper & index_mask;
+		ref = (next_plus_upper & ~index_mask) + index;
+		entry->tsk = tsk;
+	} else if (tipc_ref_table.init_point < tipc_ref_table.capacity) {
+		index = tipc_ref_table.init_point++;
+		entry = &tipc_ref_table.entries[index];
+		ref = tipc_ref_table.start_mask + index;
+	}
+
+	if (ref) {
+		entry->ref = ref;
+		entry->tsk = tsk;
+	}
+	write_unlock_bh(&ref_table_lock);
+	return ref;
+}
+
+/* tipc_sk_ref_discard - invalidate reference to an socket
+ *
+ * Disallow future references to an socket and free up the entry for re-use.
+ */
+void tipc_sk_ref_discard(u32 ref)
+{
+	struct reference *entry;
+	u32 index;
+	u32 index_mask;
+
+	if (unlikely(!tipc_ref_table.entries)) {
+		pr_err("Ref. table not found during discard attempt\n");
+		return;
+	}
+
+	index_mask = tipc_ref_table.index_mask;
+	index = ref & index_mask;
+	entry = &tipc_ref_table.entries[index];
+
+	write_lock_bh(&ref_table_lock);
+
+	if (unlikely(!entry->tsk)) {
+		pr_err("Attempt to discard ref. to non-existent socket\n");
+		goto exit;
+	}
+	if (unlikely(entry->ref != ref)) {
+		pr_err("Attempt to discard non-existent reference\n");
+		goto exit;
+	}
+
+	/* Mark entry as unused; increment instance part of entry's
+	 *   reference to invalidate any subsequent references
+	 */
+
+	entry->tsk = NULL;
+	entry->ref = (ref & ~index_mask) + (index_mask + 1);
+
+	/* Append entry to free entry list */
+	if (unlikely(tipc_ref_table.first_free == 0))
+		tipc_ref_table.first_free = index;
+	else
+		tipc_ref_table.entries[tipc_ref_table.last_free].ref |= index;
+	tipc_ref_table.last_free = index;
+exit:
+	write_unlock_bh(&ref_table_lock);
+}
+
+/* tipc_sk_get - find referenced socket and return pointer to it
+ */
+struct tipc_sock *tipc_sk_get(u32 ref)
+{
+	struct reference *entry;
+	struct tipc_sock *tsk;
+
+	if (unlikely(!tipc_ref_table.entries))
+		return NULL;
+	read_lock_bh(&ref_table_lock);
+	entry = &tipc_ref_table.entries[ref & tipc_ref_table.index_mask];
+	tsk = entry->tsk;
+	if (likely(tsk && (entry->ref == ref)))
+		sock_hold(&tsk->sk);
+	else
+		tsk = NULL;
+	read_unlock_bh(&ref_table_lock);
+	return tsk;
+}
+
+/* tipc_sk_get_next - lock & return next socket after referenced one
+*/
+struct tipc_sock *tipc_sk_get_next(u32 *ref)
+{
+	struct reference *entry;
+	struct tipc_sock *tsk = NULL;
+	uint index = *ref & tipc_ref_table.index_mask;
+
+	read_lock_bh(&ref_table_lock);
+	while (++index < tipc_ref_table.capacity) {
+		entry = &tipc_ref_table.entries[index];
+		if (!entry->tsk)
+			continue;
+		tsk = entry->tsk;
+		sock_hold(&tsk->sk);
+		*ref = entry->ref;
+		break;
+	}
+	read_unlock_bh(&ref_table_lock);
+	return tsk;
+}
+
+static void tipc_sk_put(struct tipc_sock *tsk)
+{
+	sock_put(&tsk->sk);
+}
+
 /**
  * tipc_setsockopt - set socket option
  * @sock: socket structure
@@ -1955,7 +2553,6 @@ static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
 {
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk = tipc_sk(sk);
-	struct tipc_port *port = &tsk->port;
 	u32 value;
 	int res;
 
@@ -1973,16 +2570,16 @@ static int tipc_setsockopt(struct socket *sock, int lvl, int opt,
 
 	switch (opt) {
 	case TIPC_IMPORTANCE:
-		tipc_port_set_importance(port, value);
+		res = tsk_set_importance(tsk, value);
 		break;
 	case TIPC_SRC_DROPPABLE:
 		if (sock->type != SOCK_STREAM)
-			tipc_port_set_unreliable(port, value);
+			tsk_set_unreliable(tsk, value);
 		else
 			res = -ENOPROTOOPT;
 		break;
 	case TIPC_DEST_DROPPABLE:
-		tipc_port_set_unreturnable(port, value);
+		tsk_set_unreturnable(tsk, value);
 		break;
 	case TIPC_CONN_TIMEOUT:
 		tipc_sk(sk)->conn_timeout = value;
@@ -2015,7 +2612,6 @@ static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
 {
 	struct sock *sk = sock->sk;
 	struct tipc_sock *tsk = tipc_sk(sk);
-	struct tipc_port *port = &tsk->port;
 	int len;
 	u32 value;
 	int res;
@@ -2032,16 +2628,16 @@ static int tipc_getsockopt(struct socket *sock, int lvl, int opt,
 
 	switch (opt) {
 	case TIPC_IMPORTANCE:
-		value = tipc_port_importance(port);
+		value = tsk_importance(tsk);
 		break;
 	case TIPC_SRC_DROPPABLE:
-		value = tipc_port_unreliable(port);
+		value = tsk_unreliable(tsk);
 		break;
 	case TIPC_DEST_DROPPABLE:
-		value = tipc_port_unreturnable(port);
+		value = tsk_unreturnable(tsk);
 		break;
 	case TIPC_CONN_TIMEOUT:
-		value = tipc_sk(sk)->conn_timeout;
+		value = tsk->conn_timeout;
 		/* no need to set "res", since already 0 at this point */
 		break;
 	case TIPC_NODE_RECVQ_DEPTH: