1 files changed, 733 insertions, 784 deletions

diff --git a/net/tipc/link.c b/net/tipc/link.c
index eaa9fe54b4ae..b63d57390bb7 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -77,36 +77,70 @@ static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
 };
 
 /*
- * Out-of-range value for link session numbers
+ * Interval between NACKs when packets arrive out of order
  */
-#define INVALID_SESSION 0x10000
-
+#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
 /*
- * Link state events:
+ * Out-of-range value for link session numbers
  */
-#define  STARTING_EVT    856384768	/* link processing trigger */
-#define  TRAFFIC_MSG_EVT 560815u	/* rx'd ??? */
-#define  SILENCE_EVT     560817u	/* timer dicovered silence from peer */
+#define WILDCARD_SESSION 0x10000
 
-/*
- * State value stored in 'failover_pkts'
+/* State value stored in 'failover_pkts'
  */
 #define FIRST_FAILOVER 0xffffu
 
-static void link_handle_out_of_seq_msg(struct tipc_link *link,
-				       struct sk_buff *skb);
-static void tipc_link_proto_rcv(struct tipc_link *link,
-				struct sk_buff *skb);
-static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol);
-static void link_state_event(struct tipc_link *l_ptr, u32 event);
+/* Link FSM states and events:
+ */
+enum {
+	TIPC_LINK_WORKING,
+	TIPC_LINK_PROBING,
+	TIPC_LINK_RESETTING,
+	TIPC_LINK_ESTABLISHING
+};
+
+enum {
+	PEER_RESET_EVT    = RESET_MSG,
+	ACTIVATE_EVT      = ACTIVATE_MSG,
+	TRAFFIC_EVT,      /* Any other valid msg from peer */
+	SILENCE_EVT       /* Peer was silent during last timer interval*/
+};
+
+/* Link FSM state checking routines
+ */
+static int link_working(struct tipc_link *l)
+{
+	return l->state == TIPC_LINK_WORKING;
+}
+
+static int link_probing(struct tipc_link *l)
+{
+	return l->state == TIPC_LINK_PROBING;
+}
+
+static int link_resetting(struct tipc_link *l)
+{
+	return l->state == TIPC_LINK_RESETTING;
+}
+
+static int link_establishing(struct tipc_link *l)
+{
+	return l->state == TIPC_LINK_ESTABLISHING;
+}
+
+static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
+			       struct sk_buff_head *xmitq);
+static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
+				      u16 rcvgap, int tolerance, int priority,
+				      struct sk_buff_head *xmitq);
 static void link_reset_statistics(struct tipc_link *l_ptr);
 static void link_print(struct tipc_link *l_ptr, const char *str);
-static void tipc_link_sync_xmit(struct tipc_link *l);
+static void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
+					   struct sk_buff_head *xmitq);
 static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
 static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb);
 static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);
 static bool tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb);
-static void link_set_timer(struct tipc_link *link, unsigned long time);
+
 /*
  *  Simple link routines
  */
@@ -115,26 +149,13 @@ static unsigned int align(unsigned int i)
 	return (i + 3) & ~3u;
 }
 
-static void tipc_link_release(struct kref *kref)
-{
-	kfree(container_of(kref, struct tipc_link, ref));
-}
-
-static void tipc_link_get(struct tipc_link *l_ptr)
-{
-	kref_get(&l_ptr->ref);
-}
-
-static void tipc_link_put(struct tipc_link *l_ptr)
-{
-	kref_put(&l_ptr->ref, tipc_link_release);
-}
-
 static struct tipc_link *tipc_parallel_link(struct tipc_link *l)
 {
-	if (l->owner->active_links[0] != l)
-		return l->owner->active_links[0];
-	return l->owner->active_links[1];
+	struct tipc_node *n = l->owner;
+
+	if (node_active_link(n, 0) != l)
+		return node_active_link(n, 0);
+	return node_active_link(n, 1);
 }
 
 /*
@@ -144,74 +165,14 @@ int tipc_link_is_up(struct tipc_link *l_ptr)
 {
 	if (!l_ptr)
 		return 0;
-	return link_working_working(l_ptr) || link_working_unknown(l_ptr);
+	return link_working(l_ptr) || link_probing(l_ptr);
 }
 
-int tipc_link_is_active(struct tipc_link *l_ptr)
+int tipc_link_is_active(struct tipc_link *l)
 {
-	return	(l_ptr->owner->active_links[0] == l_ptr) ||
-		(l_ptr->owner->active_links[1] == l_ptr);
-}
-
-/**
- * link_timeout - handle expiration of link timer
- * @l_ptr: pointer to link
- */
-static void link_timeout(unsigned long data)
-{
-	struct tipc_link *l_ptr = (struct tipc_link *)data;
-	struct sk_buff *skb;
-
-	tipc_node_lock(l_ptr->owner);
-
-	/* update counters used in statistical profiling of send traffic */
-	l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq);
-	l_ptr->stats.queue_sz_counts++;
-
-	skb = skb_peek(&l_ptr->transmq);
-	if (skb) {
-		struct tipc_msg *msg = buf_msg(skb);
-		u32 length = msg_size(msg);
-
-		if ((msg_user(msg) == MSG_FRAGMENTER) &&
-		    (msg_type(msg) == FIRST_FRAGMENT)) {
-			length = msg_size(msg_get_wrapped(msg));
-		}
-		if (length) {
-			l_ptr->stats.msg_lengths_total += length;
-			l_ptr->stats.msg_length_counts++;
-			if (length <= 64)
-				l_ptr->stats.msg_length_profile[0]++;
-			else if (length <= 256)
-				l_ptr->stats.msg_length_profile[1]++;
-			else if (length <= 1024)
-				l_ptr->stats.msg_length_profile[2]++;
-			else if (length <= 4096)
-				l_ptr->stats.msg_length_profile[3]++;
-			else if (length <= 16384)
-				l_ptr->stats.msg_length_profile[4]++;
-			else if (length <= 32768)
-				l_ptr->stats.msg_length_profile[5]++;
-			else
-				l_ptr->stats.msg_length_profile[6]++;
-		}
-	}
-
-	/* do all other link processing performed on a periodic basis */
-	if (l_ptr->silent_intv_cnt || tipc_bclink_acks_missing(l_ptr->owner))
-		link_state_event(l_ptr, SILENCE_EVT);
-	l_ptr->silent_intv_cnt++;
-	if (skb_queue_len(&l_ptr->backlogq))
-		tipc_link_push_packets(l_ptr);
-	link_set_timer(l_ptr, l_ptr->keepalive_intv);
-	tipc_node_unlock(l_ptr->owner);
-	tipc_link_put(l_ptr);
-}
+	struct tipc_node *n = l->owner;
 
-static void link_set_timer(struct tipc_link *link, unsigned long time)
-{
-	if (!mod_timer(&link->timer, jiffies + time))
-		tipc_link_get(link);
+	return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l);
 }
 
 /**
@@ -224,7 +185,9 @@ static void link_set_timer(struct tipc_link *link, unsigned long time)
  */
 struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 				   struct tipc_bearer *b_ptr,
-				   const struct tipc_media_addr *media_addr)
+				   const struct tipc_media_addr *media_addr,
+				   struct sk_buff_head *inputq,
+				   struct sk_buff_head *namedq)
 {
 	struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
 	struct tipc_link *l_ptr;
@@ -240,7 +203,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 		return NULL;
 	}
 
-	if (n_ptr->links[b_ptr->identity]) {
+	if (n_ptr->links[b_ptr->identity].link) {
 		tipc_addr_string_fill(addr_string, n_ptr->addr);
 		pr_err("Attempt to establish second link on <%s> to %s\n",
 		       b_ptr->name, addr_string);
@@ -252,7 +215,6 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 		pr_warn("Link creation failed, no memory\n");
 		return NULL;
 	}
-	kref_init(&l_ptr->ref);
 	l_ptr->addr = peer;
 	if_name = strchr(b_ptr->name, ':') + 1;
 	sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
@@ -263,10 +225,10 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 		/* note: peer i/f name is updated by reset/activate message */
 	memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
 	l_ptr->owner = n_ptr;
-	l_ptr->peer_session = INVALID_SESSION;
+	l_ptr->peer_session = WILDCARD_SESSION;
 	l_ptr->bearer_id = b_ptr->identity;
-	link_set_supervision_props(l_ptr, b_ptr->tolerance);
-	l_ptr->state = RESET_UNKNOWN;
+	l_ptr->tolerance = b_ptr->tolerance;
+	l_ptr->state = TIPC_LINK_RESETTING;
 
 	l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
 	msg = l_ptr->pmsg;
@@ -286,13 +248,11 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 	__skb_queue_head_init(&l_ptr->backlogq);
 	__skb_queue_head_init(&l_ptr->deferdq);
 	skb_queue_head_init(&l_ptr->wakeupq);
-	skb_queue_head_init(&l_ptr->inputq);
-	skb_queue_head_init(&l_ptr->namedq);
+	l_ptr->inputq = inputq;
+	l_ptr->namedq = namedq;
+	skb_queue_head_init(l_ptr->inputq);
 	link_reset_statistics(l_ptr);
 	tipc_node_attach_link(n_ptr, l_ptr);
-	setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr);
-	link_state_event(l_ptr, STARTING_EVT);
-
 	return l_ptr;
 }
 
@@ -303,13 +263,8 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
 void tipc_link_delete(struct tipc_link *l)
 {
 	tipc_link_reset(l);
-	if (del_timer(&l->timer))
-		tipc_link_put(l);
-	l->flags |= LINK_STOPPED;
-	/* Delete link now, or when timer is finished: */
 	tipc_link_reset_fragments(l);
 	tipc_node_detach_link(l->owner, l);
-	tipc_link_put(l);
 }
 
 void tipc_link_delete_list(struct net *net, unsigned int bearer_id)
@@ -321,7 +276,7 @@ void tipc_link_delete_list(struct net *net, unsigned int bearer_id)
 	rcu_read_lock();
 	list_for_each_entry_rcu(node, &tn->node_list, list) {
 		tipc_node_lock(node);
-		link = node->links[bearer_id];
+		link = node->links[bearer_id].link;
 		if (link)
 			tipc_link_delete(link);
 		tipc_node_unlock(node);
@@ -329,12 +284,219 @@ void tipc_link_delete_list(struct net *net, unsigned int bearer_id)
 	rcu_read_unlock();
 }
 
+/* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints.
+ *
+ * Give a newly added peer node the sequence number where it should
+ * start receiving and acking broadcast packets.
+ */
+static void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
+					   struct sk_buff_head *xmitq)
+{
+	struct sk_buff *skb;
+	struct sk_buff_head list;
+
+	skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
+			      0, l->addr, link_own_addr(l), 0, 0, 0);
+	if (!skb)
+		return;
+	__skb_queue_head_init(&list);
+	__skb_queue_tail(&list, skb);
+	tipc_link_xmit(l, &list, xmitq);
+}
+
+/**
+ * tipc_link_fsm_evt - link finite state machine
+ * @l: pointer to link
+ * @evt: state machine event to be processed
+ * @xmitq: queue to prepend created protocol message, if any
+ */
+static int tipc_link_fsm_evt(struct tipc_link *l, int evt,
+			     struct sk_buff_head *xmitq)
+{
+	int mtyp = 0, rc = 0;
+	struct tipc_link *pl;
+	enum {
+		LINK_RESET     = 1,
+		LINK_ACTIVATE  = (1 << 1),
+		SND_PROBE      = (1 << 2),
+		SND_STATE      = (1 << 3),
+		SND_RESET      = (1 << 4),
+		SND_ACTIVATE   = (1 << 5),
+		SND_BCAST_SYNC = (1 << 6)
+	} actions = 0;
+
+	if (l->exec_mode == TIPC_LINK_BLOCKED)
+		return rc;
+
+	switch (l->state) {
+	case TIPC_LINK_WORKING:
+		switch (evt) {
+		case TRAFFIC_EVT:
+		case ACTIVATE_EVT:
+			break;
+		case SILENCE_EVT:
+			l->state = TIPC_LINK_PROBING;
+			actions |= SND_PROBE;
+			break;
+		case PEER_RESET_EVT:
+			actions |= LINK_RESET | SND_ACTIVATE;
+			break;
+		default:
+			pr_debug("%s%u WORKING\n", link_unk_evt, evt);
+		}
+		break;
+	case TIPC_LINK_PROBING:
+		switch (evt) {
+		case TRAFFIC_EVT:
+		case ACTIVATE_EVT:
+			l->state = TIPC_LINK_WORKING;
+			break;
+		case PEER_RESET_EVT:
+			actions |= LINK_RESET | SND_ACTIVATE;
+			break;
+		case SILENCE_EVT:
+			if (l->silent_intv_cnt <= l->abort_limit) {
+				actions |= SND_PROBE;
+				break;
+			}
+			actions |= LINK_RESET | SND_RESET;
+			break;
+		default:
+			pr_err("%s%u PROBING\n", link_unk_evt, evt);
+		}
+		break;
+	case TIPC_LINK_RESETTING:
+		switch (evt) {
+		case TRAFFIC_EVT:
+			break;
+		case ACTIVATE_EVT:
+			pl = node_active_link(l->owner, 0);
+			if (pl && link_probing(pl))
+				break;
+			actions |= LINK_ACTIVATE;
+			if (!l->owner->working_links)
+				actions |= SND_BCAST_SYNC;
+			break;
+		case PEER_RESET_EVT:
+			l->state = TIPC_LINK_ESTABLISHING;
+			actions |= SND_ACTIVATE;
+			break;
+		case SILENCE_EVT:
+			actions |= SND_RESET;
+			break;
+		default:
+			pr_err("%s%u in RESETTING\n", link_unk_evt, evt);
+		}
+		break;
+	case TIPC_LINK_ESTABLISHING:
+		switch (evt) {
+		case TRAFFIC_EVT:
+		case ACTIVATE_EVT:
+			pl = node_active_link(l->owner, 0);
+			if (pl && link_probing(pl))
+				break;
+			actions |= LINK_ACTIVATE;
+			if (!l->owner->working_links)
+				actions |= SND_BCAST_SYNC;
+			break;
+		case PEER_RESET_EVT:
+			break;
+		case SILENCE_EVT:
+			actions |= SND_ACTIVATE;
+			break;
+		default:
+			pr_err("%s%u ESTABLISHING\n", link_unk_evt, evt);
+		}
+		break;
+	default:
+		pr_err("Unknown link state %u/%u\n", l->state, evt);
+	}
+
+	/* Perform actions as decided by FSM */
+	if (actions & LINK_RESET) {
+		l->exec_mode = TIPC_LINK_BLOCKED;
+		rc |= TIPC_LINK_DOWN_EVT;
+	}
+	if (actions & LINK_ACTIVATE) {
+		l->exec_mode = TIPC_LINK_OPEN;
+		rc |= TIPC_LINK_UP_EVT;
+	}
+	if (actions & (SND_STATE | SND_PROBE))
+		mtyp = STATE_MSG;
+	if (actions & SND_RESET)
+		mtyp = RESET_MSG;
+	if (actions & SND_ACTIVATE)
+		mtyp = ACTIVATE_MSG;
+	if (actions & (SND_PROBE | SND_STATE | SND_RESET | SND_ACTIVATE))
+		tipc_link_build_proto_msg(l, mtyp, actions & SND_PROBE,
+					  0, 0, 0, xmitq);
+	if (actions & SND_BCAST_SYNC)
+		tipc_link_build_bcast_sync_msg(l, xmitq);
+	return rc;
+}
+
+/* link_profile_stats - update statistical profiling of traffic
+ */
+static void link_profile_stats(struct tipc_link *l)
+{
+	struct sk_buff *skb;
+	struct tipc_msg *msg;
+	int length;
+
+	/* Update counters used in statistical profiling of send traffic */
+	l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
+	l->stats.queue_sz_counts++;
+
+	skb = skb_peek(&l->transmq);
+	if (!skb)
+		return;
+	msg = buf_msg(skb);
+	length = msg_size(msg);
+
+	if (msg_user(msg) == MSG_FRAGMENTER) {
+		if (msg_type(msg) != FIRST_FRAGMENT)
+			return;
+		length = msg_size(msg_get_wrapped(msg));
+	}
+	l->stats.msg_lengths_total += length;
+	l->stats.msg_length_counts++;
+	if (length <= 64)
+		l->stats.msg_length_profile[0]++;
+	else if (length <= 256)
+		l->stats.msg_length_profile[1]++;
+	else if (length <= 1024)
+		l->stats.msg_length_profile[2]++;
+	else if (length <= 4096)
+		l->stats.msg_length_profile[3]++;
+	else if (length <= 16384)
+		l->stats.msg_length_profile[4]++;
+	else if (length <= 32768)
+		l->stats.msg_length_profile[5]++;
+	else
+		l->stats.msg_length_profile[6]++;
+}
+
+/* tipc_link_timeout - perform periodic task as instructed from node timeout
+ */
+int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
+{
+	int rc = 0;
+
+	link_profile_stats(l);
+	if (l->silent_intv_cnt)
+		rc = tipc_link_fsm_evt(l, SILENCE_EVT, xmitq);
+	else if (link_working(l) && tipc_bclink_acks_missing(l->owner))
+		tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
+	l->silent_intv_cnt++;
+	return rc;
+}
+
 /**
  * link_schedule_user - schedule a message sender for wakeup after congestion
  * @link: congested link
  * @list: message that was attempted sent
  * Create pseudo msg to send back to user when congestion abates
- * Only consumes message if there is an error
+ * Does not consume buffer list
  */
 static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
 {
@@ -347,8 +509,7 @@ static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
 	/* This really cannot happen...  */
 	if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
 		pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
-		tipc_link_reset(link);
-		goto err;
+		return -ENOBUFS;
 	}
 	/* Non-blocking sender: */
 	if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending)
@@ -358,15 +519,12 @@ static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
 	skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
 			      addr, addr, oport, 0, 0);
 	if (!skb)
-		goto err;
+		return -ENOBUFS;
 	TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list);
 	TIPC_SKB_CB(skb)->chain_imp = imp;
 	skb_queue_tail(&link->wakeupq, skb);
 	link->stats.link_congs++;
 	return -ELINKCONG;
-err:
-	__skb_queue_purge(list);
-	return -ENOBUFS;
 }
 
 /**
@@ -388,8 +546,8 @@ void link_prepare_wakeup(struct tipc_link *l)
 		if ((pnd[imp] + l->backlog[imp].len) >= lim)
 			break;
 		skb_unlink(skb, &l->wakeupq);
-		skb_queue_tail(&l->inputq, skb);
-		l->owner->inputq = &l->inputq;
+		skb_queue_tail(l->inputq, skb);
+		l->owner->inputq = l->inputq;
 		l->owner->action_flags |= TIPC_MSG_EVT;
 	}
 }
@@ -436,21 +594,22 @@ void tipc_link_reset(struct tipc_link *l_ptr)
 	msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
 
 	/* Link is down, accept any session */
-	l_ptr->peer_session = INVALID_SESSION;
+	l_ptr->peer_session = WILDCARD_SESSION;
 
 	/* Prepare for renewed mtu size negotiation */
 	l_ptr->mtu = l_ptr->advertised_mtu;
 
-	l_ptr->state = RESET_UNKNOWN;
+	l_ptr->state = TIPC_LINK_RESETTING;
 
-	if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
+	if ((prev_state == TIPC_LINK_RESETTING) ||
+	    (prev_state == TIPC_LINK_ESTABLISHING))
 		return;
 
-	tipc_node_link_down(l_ptr->owner, l_ptr);
+	tipc_node_link_down(l_ptr->owner, l_ptr->bearer_id);
 	tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr);
 
 	if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) {
-		l_ptr->flags |= LINK_FAILINGOVER;
+		l_ptr->exec_mode = TIPC_LINK_BLOCKED;
 		l_ptr->failover_checkpt = l_ptr->rcv_nxt;
 		pl->failover_pkts = FIRST_FAILOVER;
 		pl->failover_checkpt = l_ptr->rcv_nxt;
@@ -462,7 +621,7 @@ void tipc_link_reset(struct tipc_link *l_ptr)
 	__skb_queue_purge(&l_ptr->transmq);
 	__skb_queue_purge(&l_ptr->deferdq);
 	if (!owner->inputq)
-		owner->inputq = &l_ptr->inputq;
+		owner->inputq = l_ptr->inputq;
 	skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq);
 	if (!skb_queue_empty(owner->inputq))
 		owner->action_flags |= TIPC_MSG_EVT;
@@ -470,173 +629,32 @@ void tipc_link_reset(struct tipc_link *l_ptr)
 	l_ptr->reasm_buf = NULL;
 	l_ptr->rcv_unacked = 0;
 	l_ptr->snd_nxt = 1;
+	l_ptr->rcv_nxt = 1;
 	l_ptr->silent_intv_cnt = 0;
+	l_ptr->stats.recv_info = 0;
 	l_ptr->stale_count = 0;
 	link_reset_statistics(l_ptr);
 }
 
-static void link_activate(struct tipc_link *link)
+void tipc_link_activate(struct tipc_link *link)
 {
 	struct tipc_node *node = link->owner;
 
 	link->rcv_nxt = 1;
 	link->stats.recv_info = 1;
 	link->silent_intv_cnt = 0;
-	tipc_node_link_up(node, link);
+	link->state = TIPC_LINK_WORKING;
+	link->exec_mode = TIPC_LINK_OPEN;
+	tipc_node_link_up(node, link->bearer_id);
 	tipc_bearer_add_dest(node->net, link->bearer_id, link->addr);
 }
 
 /**
- * link_state_event - link finite state machine
- * @l_ptr: pointer to link
- * @event: state machine event to process
- */
-static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
-{
-	struct tipc_link *other;
-	unsigned long timer_intv = l_ptr->keepalive_intv;
-
-	if (l_ptr->flags & LINK_STOPPED)
-		return;
-
-	if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT))
-		return;		/* Not yet. */
-
-	if (l_ptr->flags & LINK_FAILINGOVER)
-		return;
-
-	switch (l_ptr->state) {
-	case WORKING_WORKING:
-		switch (event) {
-		case TRAFFIC_MSG_EVT:
-		case ACTIVATE_MSG:
-			l_ptr->silent_intv_cnt = 0;
-			break;
-		case SILENCE_EVT:
-			if (!l_ptr->silent_intv_cnt) {
-				if (tipc_bclink_acks_missing(l_ptr->owner))
-					tipc_link_proto_xmit(l_ptr, STATE_MSG,
-							     0, 0, 0, 0);
-				break;
-			}
-			l_ptr->state = WORKING_UNKNOWN;
-			tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
-			break;
-		case RESET_MSG:
-			pr_debug("%s<%s>, requested by peer\n",
-				 link_rst_msg, l_ptr->name);
-			tipc_link_reset(l_ptr);
-			l_ptr->state = RESET_RESET;
-			tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
-					     0, 0, 0, 0);
-			break;
-		default:
-			pr_debug("%s%u in WW state\n", link_unk_evt, event);
-		}
-		break;
-	case WORKING_UNKNOWN:
-		switch (event) {
-		case TRAFFIC_MSG_EVT:
-		case ACTIVATE_MSG:
-			l_ptr->state = WORKING_WORKING;
-			l_ptr->silent_intv_cnt = 0;
-			break;
-		case RESET_MSG:
-			pr_debug("%s<%s>, requested by peer while probing\n",
-				 link_rst_msg, l_ptr->name);
-			tipc_link_reset(l_ptr);
-			l_ptr->state = RESET_RESET;
-			tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
-					     0, 0, 0, 0);
-			break;
-		case SILENCE_EVT:
-			if (!l_ptr->silent_intv_cnt) {
-				l_ptr->state = WORKING_WORKING;
-				if (tipc_bclink_acks_missing(l_ptr->owner))
-					tipc_link_proto_xmit(l_ptr, STATE_MSG,
-							     0, 0, 0, 0);
-			} else if (l_ptr->silent_intv_cnt <
-				   l_ptr->abort_limit) {
-				tipc_link_proto_xmit(l_ptr, STATE_MSG,
-						     1, 0, 0, 0);
-			} else {	/* Link has failed */
-				pr_debug("%s<%s>, peer not responding\n",
-					 link_rst_msg, l_ptr->name);
-				tipc_link_reset(l_ptr);
-				l_ptr->state = RESET_UNKNOWN;
-				tipc_link_proto_xmit(l_ptr, RESET_MSG,
-						     0, 0, 0, 0);
-			}
-			break;
-		default:
-			pr_err("%s%u in WU state\n", link_unk_evt, event);
-		}
-		break;
-	case RESET_UNKNOWN:
-		switch (event) {
-		case TRAFFIC_MSG_EVT:
-			break;
-		case ACTIVATE_MSG:
-			other = l_ptr->owner->active_links[0];
-			if (other && link_working_unknown(other))
-				break;
-			l_ptr->state = WORKING_WORKING;
-			link_activate(l_ptr);
-			tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
-			if (l_ptr->owner->working_links == 1)
-				tipc_link_sync_xmit(l_ptr);
-			break;
-		case RESET_MSG:
-			l_ptr->state = RESET_RESET;
-			tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
-					     1, 0, 0, 0);
-			break;
-		case STARTING_EVT:
-			l_ptr->flags |= LINK_STARTED;
-			link_set_timer(l_ptr, timer_intv);
-			break;
-		case SILENCE_EVT:
-			tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0);
-			break;
-		default:
-			pr_err("%s%u in RU state\n", link_unk_evt, event);
-		}
-		break;
-	case RESET_RESET:
-		switch (event) {
-		case TRAFFIC_MSG_EVT:
-		case ACTIVATE_MSG:
-			other = l_ptr->owner->active_links[0];
-			if (other && link_working_unknown(other))
-				break;
-			l_ptr->state = WORKING_WORKING;
-			link_activate(l_ptr);
-			tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
-			if (l_ptr->owner->working_links == 1)
-				tipc_link_sync_xmit(l_ptr);
-			break;
-		case RESET_MSG:
-			break;
-		case SILENCE_EVT:
-			tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
-					     0, 0, 0, 0);
-			break;
-		default:
-			pr_err("%s%u in RR state\n", link_unk_evt, event);
-		}
-		break;
-	default:
-		pr_err("Unknown link state %u/%u\n", l_ptr->state, event);
-	}
-}
-
-/**
  * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
  * @link: link to use
  * @list: chain of buffers containing message
  *
- * Consumes the buffer chain, except when returning -ELINKCONG,
- * since the caller then may want to make more send attempts.
+ * Consumes the buffer chain, except when returning an error code,
  * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
  * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
  */
@@ -660,10 +678,9 @@ int __tipc_link_xmit(struct net *net, struct tipc_link *link,
 		if (unlikely(link->backlog[i].len >= link->backlog[i].limit))
 			return link_schedule_user(link, list);
 	}
-	if (unlikely(msg_size(msg) > mtu)) {
-		__skb_queue_purge(list);
+	if (unlikely(msg_size(msg) > mtu))
 		return -EMSGSIZE;
-	}
+
 	/* Prepare each packet for sending, and add to relevant queue: */
 	while (skb_queue_len(list)) {
 		skb = skb_peek(list);
@@ -700,101 +717,90 @@ int __tipc_link_xmit(struct net *net, struct tipc_link *link,
 	return 0;
 }
 
-static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)
-{
-	skb_queue_head_init(list);
-	__skb_queue_tail(list, skb);
-}
-
-static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb)
-{
-	struct sk_buff_head head;
-
-	skb2list(skb, &head);
-	return __tipc_link_xmit(link->owner->net, link, &head);
-}
-
-/* tipc_link_xmit_skb(): send single buffer to destination
- * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
- * messages, which will not be rejected
- * The only exception is datagram messages rerouted after secondary
- * lookup, which are rare and safe to dispose of anyway.
- * TODO: Return real return value, and let callers use
- * tipc_wait_for_sendpkt() where applicable
- */
-int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
-		       u32 selector)
-{
-	struct sk_buff_head head;
-	int rc;
-
-	skb2list(skb, &head);
-	rc = tipc_link_xmit(net, &head, dnode, selector);
-	if (rc == -ELINKCONG)
-		kfree_skb(skb);
-	return 0;
-}
-
 /**
- * tipc_link_xmit() is the general link level function for message sending
- * @net: the applicable net namespace
+ * tipc_link_xmit(): enqueue buffer list according to queue situation
+ * @link: link to use
  * @list: chain of buffers containing message
- * @dsz: amount of user data to be sent
- * @dnode: address of destination node
- * @selector: a number used for deterministic link selection
- * Consumes the buffer chain, except when returning -ELINKCONG
- * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
+ * @xmitq: returned list of packets to be sent by caller
+ *
+ * Consumes the buffer chain, except when returning -ELINKCONG,
+ * since the caller then may want to make more send attempts.
+ * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
+ * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
  */
-int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode,
-		   u32 selector)
+int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
+		   struct sk_buff_head *xmitq)
 {
-	struct tipc_link *link = NULL;
-	struct tipc_node *node;
-	int rc = -EHOSTUNREACH;
+	struct tipc_msg *hdr = buf_msg(skb_peek(list));
+	unsigned int maxwin = l->window;
+	unsigned int i, imp = msg_importance(hdr);
+	unsigned int mtu = l->mtu;
+	u16 ack = l->rcv_nxt - 1;
+	u16 seqno = l->snd_nxt;
+	u16 bc_last_in = l->owner->bclink.last_in;
+	struct sk_buff_head *transmq = &l->transmq;
+	struct sk_buff_head *backlogq = &l->backlogq;
+	struct sk_buff *skb, *_skb, *bskb;
 
-	node = tipc_node_find(net, dnode);
-	if (node) {
-		tipc_node_lock(node);
-		link = node->active_links[selector & 1];
-		if (link)
-			rc = __tipc_link_xmit(net, link, list);
-		tipc_node_unlock(node);
-		tipc_node_put(node);
+	/* Match msg importance against this and all higher backlog limits: */
+	for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
+		if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
+			return link_schedule_user(l, list);
 	}
-	if (link)
-		return rc;
+	if (unlikely(msg_size(hdr) > mtu))
+		return -EMSGSIZE;
 
-	if (likely(in_own_node(net, dnode))) {
-		tipc_sk_rcv(net, list);
-		return 0;
-	}
+	/* Prepare each packet for sending, and add to relevant queue: */
+	while (skb_queue_len(list)) {
+		skb = skb_peek(list);
+		hdr = buf_msg(skb);
+		msg_set_seqno(hdr, seqno);
+		msg_set_ack(hdr, ack);
+		msg_set_bcast_ack(hdr, bc_last_in);
 
-	__skb_queue_purge(list);
-	return rc;
+		if (likely(skb_queue_len(transmq) < maxwin)) {
+			_skb = skb_clone(skb, GFP_ATOMIC);
+			if (!_skb)
+				return -ENOBUFS;
+			__skb_dequeue(list);
+			__skb_queue_tail(transmq, skb);
+			__skb_queue_tail(xmitq, _skb);
+			l->rcv_unacked = 0;
+			seqno++;
+			continue;
+		}
+		if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
+			kfree_skb(__skb_dequeue(list));
+			l->stats.sent_bundled++;
+			continue;
+		}
+		if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
+			kfree_skb(__skb_dequeue(list));
+			__skb_queue_tail(backlogq, bskb);
+			l->backlog[msg_importance(buf_msg(bskb))].len++;
+			l->stats.sent_bundled++;
+			l->stats.sent_bundles++;
+			continue;
+		}
+		l->backlog[imp].len += skb_queue_len(list);
+		skb_queue_splice_tail_init(list, backlogq);
+	}
+	l->snd_nxt = seqno;
+	return 0;
 }
 
-/*
- * tipc_link_sync_xmit - synchronize broadcast link endpoints.
- *
- * Give a newly added peer node the sequence number where it should
- * start receiving and acking broadcast packets.
- *
- * Called with node locked
- */
-static void tipc_link_sync_xmit(struct tipc_link *link)
+static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)
 {
-	struct sk_buff *skb;
-	struct tipc_msg *msg;
+	skb_queue_head_init(list);
+	__skb_queue_tail(list, skb);
+}
 
-	skb = tipc_buf_acquire(INT_H_SIZE);
-	if (!skb)
-		return;
+static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb)
+{
+	struct sk_buff_head head;
 
-	msg = buf_msg(skb);
-	tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG,
-		      INT_H_SIZE, link->addr);
-	msg_set_last_bcast(msg, link->owner->bclink.acked);
-	__tipc_link_xmit_skb(link, skb);
+	skb2list(skb, &head);
+	return __tipc_link_xmit(link->owner->net, link, &head);
 }
 
 /*
@@ -847,6 +853,34 @@ void tipc_link_push_packets(struct tipc_link *link)
 	link->snd_nxt = seqno;
 }
 
+void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
+{
+	struct sk_buff *skb, *_skb;
+	struct tipc_msg *hdr;
+	u16 seqno = l->snd_nxt;
+	u16 ack = l->rcv_nxt - 1;
+
+	while (skb_queue_len(&l->transmq) < l->window) {
+		skb = skb_peek(&l->backlogq);
+		if (!skb)
+			break;
+		_skb = skb_clone(skb, GFP_ATOMIC);
+		if (!_skb)
+			break;
+		__skb_dequeue(&l->backlogq);
+		hdr = buf_msg(skb);
+		l->backlog[msg_importance(hdr)].len--;
+		__skb_queue_tail(&l->transmq, skb);
+		__skb_queue_tail(xmitq, _skb);
+		msg_set_ack(hdr, ack);
+		msg_set_seqno(hdr, seqno);
+		msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
+		l->rcv_unacked = 0;
+		seqno++;
+	}
+	l->snd_nxt = seqno;
+}
+
 void tipc_link_reset_all(struct tipc_node *node)
 {
 	char addr_string[16];
@@ -858,9 +892,9 @@ void tipc_link_reset_all(struct tipc_node *node)
 		tipc_addr_string_fill(addr_string, node->addr));
 
 	for (i = 0; i < MAX_BEARERS; i++) {
-		if (node->links[i]) {
-			link_print(node->links[i], "Resetting link\n");
-			tipc_link_reset(node->links[i]);
+		if (node->links[i].link) {
+			link_print(node->links[i].link, "Resetting link\n");
+			tipc_link_reset(node->links[i].link);
 		}
 	}
 
@@ -877,9 +911,13 @@ static void link_retransmit_failure(struct tipc_link *l_ptr,
 
 	if (l_ptr->addr) {
 		/* Handle failure on standard link */
-		link_print(l_ptr, "Resetting link\n");
+		link_print(l_ptr, "Resetting link ");
+		pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
+			msg_user(msg), msg_type(msg), msg_size(msg),
+			msg_errcode(msg));
+		pr_info("sqno %u, prev: %x, src: %x\n",
+			msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg));
 		tipc_link_reset(l_ptr);
-
 	} else {
 		/* Handle failure on broadcast link */
 		struct tipc_node *n_ptr;
@@ -940,6 +978,41 @@ void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
 	}
 }
 
+static int tipc_link_retransm(struct tipc_link *l, int retransm,
+			      struct sk_buff_head *xmitq)
+{
+	struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
+	struct tipc_msg *hdr;
+
+	if (!skb)
+		return 0;
+
+	/* Detect repeated retransmit failures on same packet */
+	if (likely(l->last_retransm != buf_seqno(skb))) {
+		l->last_retransm = buf_seqno(skb);
+		l->stale_count = 1;
+	} else if (++l->stale_count > 100) {
+		link_retransmit_failure(l, skb);
+		return TIPC_LINK_DOWN_EVT;
+	}
+	skb_queue_walk(&l->transmq, skb) {
+		if (!retransm)
+			return 0;
+		hdr = buf_msg(skb);
+		_skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
+		if (!_skb)
+			return 0;
+		hdr = buf_msg(_skb);
+		msg_set_ack(hdr, l->rcv_nxt - 1);
+		msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
+		_skb->priority = TC_PRIO_CONTROL;
+		__skb_queue_tail(xmitq, _skb);
+		retransm--;
+		l->stats.retransmitted++;
+	}
+	return 0;
+}
+
 /* link_synch(): check if all packets arrived before the synch
  *               point have been consumed
  * Returns true if the parallel links are synched, otherwise false
@@ -959,168 +1032,13 @@ static bool link_synch(struct tipc_link *l)
 
 	/* Is it still in the input queue ? */
 	post_synch = mod(pl->rcv_nxt - l->synch_point) - 1;
-	if (skb_queue_len(&pl->inputq) > post_synch)
+	if (skb_queue_len(pl->inputq) > post_synch)
 		return false;
 synched:
-	l->flags &= ~LINK_SYNCHING;
+	l->exec_mode = TIPC_LINK_OPEN;
 	return true;
 }
 
-static void link_retrieve_defq(struct tipc_link *link,
-			       struct sk_buff_head *list)
-{
-	u16 seq_no;
-
-	if (skb_queue_empty(&link->deferdq))
-		return;
-
-	seq_no = buf_seqno(skb_peek(&link->deferdq));
-	if (seq_no == link->rcv_nxt)
-		skb_queue_splice_tail_init(&link->deferdq, list);
-}
-
-/**
- * tipc_rcv - process TIPC packets/messages arriving from off-node
- * @net: the applicable net namespace
- * @skb: TIPC packet
- * @b_ptr: pointer to bearer message arrived on
- *
- * Invoked with no locks held.  Bearer pointer must point to a valid bearer
- * structure (i.e. cannot be NULL), but bearer can be inactive.
- */
-void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
-{
-	struct tipc_net *tn = net_generic(net, tipc_net_id);
-	struct sk_buff_head head;
-	struct tipc_node *n_ptr;
-	struct tipc_link *l_ptr;
-	struct sk_buff *skb1, *tmp;
-	struct tipc_msg *msg;
-	u16 seq_no;
-	u16 ackd;
-	u32 released;
-
-	skb2list(skb, &head);
-
-	while ((skb = __skb_dequeue(&head))) {
-		/* Ensure message is well-formed */
-		if (unlikely(!tipc_msg_validate(skb)))
-			goto discard;
-
-		/* Handle arrival of a non-unicast link message */
-		msg = buf_msg(skb);
-		if (unlikely(msg_non_seq(msg))) {
-			if (msg_user(msg) ==  LINK_CONFIG)
-				tipc_disc_rcv(net, skb, b_ptr);
-			else
-				tipc_bclink_rcv(net, skb);
-			continue;
-		}
-
-		/* Discard unicast link messages destined for another node */
-		if (unlikely(!msg_short(msg) &&
-			     (msg_destnode(msg) != tn->own_addr)))
-			goto discard;
-
-		/* Locate neighboring node that sent message */
-		n_ptr = tipc_node_find(net, msg_prevnode(msg));
-		if (unlikely(!n_ptr))
-			goto discard;
-
-		tipc_node_lock(n_ptr);
-		/* Locate unicast link endpoint that should handle message */
-		l_ptr = n_ptr->links[b_ptr->identity];
-		if (unlikely(!l_ptr))
-			goto unlock;
-
-		/* Verify that communication with node is currently allowed */
-		if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) &&
-		    msg_user(msg) == LINK_PROTOCOL &&
-		    (msg_type(msg) == RESET_MSG ||
-		    msg_type(msg) == ACTIVATE_MSG) &&
-		    !msg_redundant_link(msg))
-			n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN;
-
-		if (tipc_node_blocked(n_ptr))
-			goto unlock;
-
-		/* Validate message sequence number info */
-		seq_no = msg_seqno(msg);
-		ackd = msg_ack(msg);
-
-		/* Release acked messages */
-		if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg)))
-			tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
-
-		released = 0;
-		skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) {
-			if (more(buf_seqno(skb1), ackd))
-				break;
-			 __skb_unlink(skb1, &l_ptr->transmq);
-			 kfree_skb(skb1);
-			 released = 1;
-		}
-
-		/* Try sending any messages link endpoint has pending */
-		if (unlikely(skb_queue_len(&l_ptr->backlogq)))
-			tipc_link_push_packets(l_ptr);
-
-		if (released && !skb_queue_empty(&l_ptr->wakeupq))
-			link_prepare_wakeup(l_ptr);
-
-		/* Process the incoming packet */
-		if (unlikely(!link_working_working(l_ptr))) {
-			if (msg_user(msg) == LINK_PROTOCOL) {
-				tipc_link_proto_rcv(l_ptr, skb);
-				link_retrieve_defq(l_ptr, &head);
-				skb = NULL;
-				goto unlock;
-			}
-
-			/* Traffic message. Conditionally activate link */
-			link_state_event(l_ptr, TRAFFIC_MSG_EVT);
-
-			if (link_working_working(l_ptr)) {
-				/* Re-insert buffer in front of queue */
-				__skb_queue_head(&head, skb);
-				skb = NULL;
-				goto unlock;
-			}
-			goto unlock;
-		}
-
-		/* Link is now in state WORKING_WORKING */
-		if (unlikely(seq_no != l_ptr->rcv_nxt)) {
-			link_handle_out_of_seq_msg(l_ptr, skb);
-			link_retrieve_defq(l_ptr, &head);
-			skb = NULL;
-			goto unlock;
-		}
-		l_ptr->silent_intv_cnt = 0;
-
-		/* Synchronize with parallel link if applicable */
-		if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) {
-			if (!link_synch(l_ptr))
-				goto unlock;
-		}
-		l_ptr->rcv_nxt++;
-		if (unlikely(!skb_queue_empty(&l_ptr->deferdq)))
-			link_retrieve_defq(l_ptr, &head);
-		if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
-			l_ptr->stats.sent_acks++;
-			tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
-		}
-		tipc_link_input(l_ptr, skb);
-		skb = NULL;
-unlock:
-		tipc_node_unlock(n_ptr);
-		tipc_node_put(n_ptr);
-discard:
-		if (unlikely(skb))
-			kfree_skb(skb);
-	}
-}
-
 /* tipc_data_input - deliver data and name distr msgs to upper layer
  *
  * Consumes buffer if message is of right type
@@ -1138,16 +1056,16 @@ static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb)
 	case TIPC_HIGH_IMPORTANCE:
 	case TIPC_CRITICAL_IMPORTANCE:
 	case CONN_MANAGER:
-		if (tipc_skb_queue_tail(&link->inputq, skb, dport)) {
-			node->inputq = &link->inputq;
+		if (tipc_skb_queue_tail(link->inputq, skb, dport)) {
+			node->inputq = link->inputq;
 			node->action_flags |= TIPC_MSG_EVT;
 		}
 		return true;
 	case NAME_DISTRIBUTOR:
 		node->bclink.recv_permitted = true;
-		node->namedq = &link->namedq;
-		skb_queue_tail(&link->namedq, skb);
-		if (skb_queue_len(&link->namedq) == 1)
+		node->namedq = link->namedq;
+		skb_queue_tail(link->namedq, skb);
+		if (skb_queue_len(link->namedq) == 1)
 			node->action_flags |= TIPC_NAMED_MSG_EVT;
 		return true;
 	case MSG_BUNDLER:
@@ -1174,13 +1092,10 @@ static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
 	struct sk_buff *iskb;
 	int pos = 0;
 
-	if (likely(tipc_data_input(link, skb)))
-		return;
-
 	switch (msg_user(msg)) {
 	case TUNNEL_PROTOCOL:
 		if (msg_dup(msg)) {
-			link->flags |= LINK_SYNCHING;
+			link->exec_mode = TIPC_LINK_TUNNEL;
 			link->synch_point = msg_seqno(msg_get_wrapped(msg));
 			kfree_skb(skb);
 			break;
@@ -1215,6 +1130,110 @@ static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
 	};
 }
 
+static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
+{
+	bool released = false;
+	struct sk_buff *skb, *tmp;
+
+	skb_queue_walk_safe(&l->transmq, skb, tmp) {
+		if (more(buf_seqno(skb), acked))
+			break;
+		__skb_unlink(skb, &l->transmq);
+		kfree_skb(skb);
+		released = true;
+	}
+	return released;
+}
+
+/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
+ * @link: the link that should handle the message
+ * @skb: TIPC packet
+ * @xmitq: queue to place packets to be sent after this call
+ */
+int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
+		  struct sk_buff_head *xmitq)
+{
+	struct sk_buff_head *arrvq = &l->deferdq;
+	struct sk_buff *tmp;
+	struct tipc_msg *hdr;
+	u16 seqno, rcv_nxt;
+	int rc = 0;
+
+	if (unlikely(!__tipc_skb_queue_sorted(arrvq, skb))) {
+		if (!(skb_queue_len(arrvq) % TIPC_NACK_INTV))
+			tipc_link_build_proto_msg(l, STATE_MSG, 0,
+						  0, 0, 0, xmitq);
+		return rc;
+	}
+
+	skb_queue_walk_safe(arrvq, skb, tmp) {
+		hdr = buf_msg(skb);
+
+		/* Verify and update link state */
+		if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) {
+			__skb_dequeue(arrvq);
+			rc |= tipc_link_proto_rcv(l, skb, xmitq);
+			continue;
+		}
+
+		if (unlikely(!link_working(l))) {
+			rc |= tipc_link_fsm_evt(l, TRAFFIC_EVT, xmitq);
+			if (!link_working(l)) {
+				kfree_skb(__skb_dequeue(arrvq));
+				return rc;
+			}
+		}
+
+		l->silent_intv_cnt = 0;
+
+		/* Forward queues and wake up waiting users */
+		if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
+			tipc_link_advance_backlog(l, xmitq);
+			if (unlikely(!skb_queue_empty(&l->wakeupq)))
+				link_prepare_wakeup(l);
+		}
+
+		/* Defer reception if there is a gap in the sequence */
+		seqno = msg_seqno(hdr);
+		rcv_nxt = l->rcv_nxt;
+		if (unlikely(less(rcv_nxt, seqno))) {
+			l->stats.deferred_recv++;
+			return rc;
+		}
+
+		__skb_dequeue(arrvq);
+
+		/* Drop if packet already received */
+		if (unlikely(more(rcv_nxt, seqno))) {
+			l->stats.duplicates++;
+			kfree_skb(skb);
+			return rc;
+		}
+
+		/* Synchronize with parallel link if applicable */
+		if (unlikely(l->exec_mode == TIPC_LINK_TUNNEL))
+			if (!msg_dup(hdr) && !link_synch(l)) {
+				kfree_skb(skb);
+				return rc;
+			}
+
+		/* Packet can be delivered */
+		l->rcv_nxt++;
+		l->stats.recv_info++;
+		if (unlikely(!tipc_data_input(l, skb)))
+			tipc_link_input(l, skb);
+
+		/* Ack at regular intervals */
+		if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
+			l->rcv_unacked = 0;
+			l->stats.sent_acks++;
+			tipc_link_build_proto_msg(l, STATE_MSG,
+						  0, 0, 0, 0, xmitq);
+		}
+	}
+	return rc;
+}
+
 /**
  * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue
  *
@@ -1255,235 +1274,85 @@ u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
 }
 
 /*
- * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
+ * Send protocol message to the other endpoint.
  */
-static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
-				       struct sk_buff *buf)
+void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg,
+			  u32 gap, u32 tolerance, u32 priority)
 {
-	u32 seq_no = buf_seqno(buf);
-
-	if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
-		tipc_link_proto_rcv(l_ptr, buf);
-		return;
-	}
-
-	/* Record OOS packet arrival */
-	l_ptr->silent_intv_cnt = 0;
+	struct sk_buff *skb = NULL;
+	struct sk_buff_head xmitq;
 
-	/*
-	 * Discard packet if a duplicate; otherwise add it to deferred queue
-	 * and notify peer of gap as per protocol specification
-	 */
-	if (less(seq_no, l_ptr->rcv_nxt)) {
-		l_ptr->stats.duplicates++;
-		kfree_skb(buf);
+	__skb_queue_head_init(&xmitq);
+	tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap,
+				  tolerance, priority, &xmitq);
+	skb = __skb_dequeue(&xmitq);
+	if (!skb)
 		return;
-	}
-
-	if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) {
-		l_ptr->stats.deferred_recv++;
-		if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1)
-			tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
-	} else {
-		l_ptr->stats.duplicates++;
-	}
+	tipc_bearer_send(l->owner->net, l->bearer_id, skb, &l->media_addr);
+	l->rcv_unacked = 0;
+	kfree_skb(skb);
 }
 
-/*
- * Send protocol message to the other endpoint.
+/* tipc_link_build_proto_msg: prepare link protocol message for transmission
  */
-void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
-			  u32 gap, u32 tolerance, u32 priority)
+static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
+				      u16 rcvgap, int tolerance, int priority,
+				      struct sk_buff_head *xmitq)
 {
-	struct sk_buff *buf = NULL;
-	struct tipc_msg *msg = l_ptr->pmsg;
-	u32 msg_size = sizeof(l_ptr->proto_msg);
-	int r_flag;
-	u16 last_rcv;
-
-	/* Don't send protocol message during link failover */
-	if (l_ptr->flags & LINK_FAILINGOVER)
-		return;
-
-	/* Abort non-RESET send if communication with node is prohibited */
-	if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG))
+	struct sk_buff *skb = NULL;
+	struct tipc_msg *hdr = l->pmsg;
+	u16 snd_nxt = l->snd_nxt;
+	u16 rcv_nxt = l->rcv_nxt;
+	u16 rcv_last = rcv_nxt - 1;
+	int node_up = l->owner->bclink.recv_permitted;
+
+	/* Don't send protocol message during reset or link failover */
+	if (l->exec_mode == TIPC_LINK_BLOCKED)
 		return;
 
-	/* Create protocol message with "out-of-sequence" sequence number */
-	msg_set_type(msg, msg_typ);
-	msg_set_net_plane(msg, l_ptr->net_plane);
-	msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
-	msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net));
+	msg_set_type(hdr, mtyp);
+	msg_set_net_plane(hdr, l->net_plane);
+	msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
+	msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net));
+	msg_set_link_tolerance(hdr, tolerance);
+	msg_set_linkprio(hdr, priority);
+	msg_set_redundant_link(hdr, node_up);
+	msg_set_seq_gap(hdr, 0);
 
-	if (msg_typ == STATE_MSG) {
-		u16 next_sent = l_ptr->snd_nxt;
+	/* Compatibility: created msg must not be in sequence with pkt flow */
+	msg_set_seqno(hdr, snd_nxt + U16_MAX / 2);
 
-		if (!tipc_link_is_up(l_ptr))
+	if (mtyp == STATE_MSG) {
+		if (!tipc_link_is_up(l))
 			return;
-		msg_set_next_sent(msg, next_sent);
-		if (!skb_queue_empty(&l_ptr->deferdq)) {
-			last_rcv = buf_seqno(skb_peek(&l_ptr->deferdq));
-			gap = mod(last_rcv - l_ptr->rcv_nxt);
+		msg_set_next_sent(hdr, snd_nxt);
+
+		/* Override rcvgap if there are packets in deferred queue */
+		if (!skb_queue_empty(&l->deferdq))
+			rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt;
+		if (rcvgap) {
+			msg_set_seq_gap(hdr, rcvgap);
+			l->stats.sent_nacks++;
 		}
-		msg_set_seq_gap(msg, gap);
-		if (gap)
-			l_ptr->stats.sent_nacks++;
-		msg_set_link_tolerance(msg, tolerance);
-		msg_set_linkprio(msg, priority);
-		msg_set_max_pkt(msg, l_ptr->mtu);
-		msg_set_ack(msg, mod(l_ptr->rcv_nxt - 1));
-		msg_set_probe(msg, probe_msg != 0);
-		if (probe_msg)
-			l_ptr->stats.sent_probes++;
-		l_ptr->stats.sent_states++;
-	} else {		/* RESET_MSG or ACTIVATE_MSG */
-		msg_set_ack(msg, mod(l_ptr->failover_checkpt - 1));
-		msg_set_seq_gap(msg, 0);
-		msg_set_next_sent(msg, 1);
-		msg_set_probe(msg, 0);
-		msg_set_link_tolerance(msg, l_ptr->tolerance);
-		msg_set_linkprio(msg, l_ptr->priority);
-		msg_set_max_pkt(msg, l_ptr->advertised_mtu);
+		msg_set_ack(hdr, rcv_last);
+		msg_set_probe(hdr, probe);
+		if (probe)
+			l->stats.sent_probes++;
+		l->stats.sent_states++;
+	} else {
+		/* RESET_MSG or ACTIVATE_MSG */
+		msg_set_max_pkt(hdr, l->advertised_mtu);
+		msg_set_ack(hdr, l->failover_checkpt - 1);
+		msg_set_next_sent(hdr, 1);
 	}
-
-	r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr));
-	msg_set_redundant_link(msg, r_flag);
-	msg_set_linkprio(msg, l_ptr->priority);
-	msg_set_size(msg, msg_size);
-
-	msg_set_seqno(msg, mod(l_ptr->snd_nxt + (0xffff / 2)));
-
-	buf = tipc_buf_acquire(msg_size);
-	if (!buf)
+	skb = tipc_buf_acquire(msg_size(hdr));
+	if (!skb)
 		return;
-
-	skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
-	buf->priority = TC_PRIO_CONTROL;
-	tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf,
-			 &l_ptr->media_addr);
-	l_ptr->rcv_unacked = 0;
-	kfree_skb(buf);
+	skb_copy_to_linear_data(skb, hdr, msg_size(hdr));
+	skb->priority = TC_PRIO_CONTROL;
+	__skb_queue_head(xmitq, skb);
 }
 
-/*
- * Receive protocol message :
- * Note that network plane id propagates through the network, and may
- * change at any time. The node with lowest address rules
- */
-static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
-				struct sk_buff *buf)
-{
-	u32 rec_gap = 0;
-	u32 msg_tol;
-	struct tipc_msg *msg = buf_msg(buf);
-
-	if (l_ptr->flags & LINK_FAILINGOVER)
-		goto exit;
-
-	if (l_ptr->net_plane != msg_net_plane(msg))
-		if (link_own_addr(l_ptr) > msg_prevnode(msg))
-			l_ptr->net_plane = msg_net_plane(msg);
-
-	switch (msg_type(msg)) {
-
-	case RESET_MSG:
-		if (!link_working_unknown(l_ptr) &&
-		    (l_ptr->peer_session != INVALID_SESSION)) {
-			if (less_eq(msg_session(msg), l_ptr->peer_session))
-				break; /* duplicate or old reset: ignore */
-		}
-
-		if (!msg_redundant_link(msg) && (link_working_working(l_ptr) ||
-				link_working_unknown(l_ptr))) {
-			/*
-			 * peer has lost contact -- don't allow peer's links
-			 * to reactivate before we recognize loss & clean up
-			 */
-			l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN;
-		}
-
-		link_state_event(l_ptr, RESET_MSG);
-
-		/* fall thru' */
-	case ACTIVATE_MSG:
-		/* Update link settings according other endpoint's values */
-		strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
-
-		msg_tol = msg_link_tolerance(msg);
-		if (msg_tol > l_ptr->tolerance)
-			link_set_supervision_props(l_ptr, msg_tol);
-
-		if (msg_linkprio(msg) > l_ptr->priority)
-			l_ptr->priority = msg_linkprio(msg);
-
-		if (l_ptr->mtu > msg_max_pkt(msg))
-			l_ptr->mtu = msg_max_pkt(msg);
-
-		/* Synchronize broadcast link info, if not done previously */
-		if (!tipc_node_is_up(l_ptr->owner)) {
-			l_ptr->owner->bclink.last_sent =
-				l_ptr->owner->bclink.last_in =
-				msg_last_bcast(msg);
-			l_ptr->owner->bclink.oos_state = 0;
-		}
-
-		l_ptr->peer_session = msg_session(msg);
-		l_ptr->peer_bearer_id = msg_bearer_id(msg);
-
-		if (msg_type(msg) == ACTIVATE_MSG)
-			link_state_event(l_ptr, ACTIVATE_MSG);
-		break;
-	case STATE_MSG:
-
-		msg_tol = msg_link_tolerance(msg);
-		if (msg_tol)
-			link_set_supervision_props(l_ptr, msg_tol);
-
-		if (msg_linkprio(msg) &&
-		    (msg_linkprio(msg) != l_ptr->priority)) {
-			pr_debug("%s<%s>, priority change %u->%u\n",
-				 link_rst_msg, l_ptr->name,
-				 l_ptr->priority, msg_linkprio(msg));
-			l_ptr->priority = msg_linkprio(msg);
-			tipc_link_reset(l_ptr); /* Enforce change to take effect */
-			break;
-		}
-
-		/* Record reception; force mismatch at next timeout: */
-		l_ptr->silent_intv_cnt = 0;
-
-		link_state_event(l_ptr, TRAFFIC_MSG_EVT);
-		l_ptr->stats.recv_states++;
-		if (link_reset_unknown(l_ptr))
-			break;
-
-		if (less_eq(l_ptr->rcv_nxt, msg_next_sent(msg)))
-			rec_gap = mod(msg_next_sent(msg) - l_ptr->rcv_nxt);
-
-		if (msg_probe(msg))
-			l_ptr->stats.recv_probes++;
-
-		/* Protocol message before retransmits, reduce loss risk */
-		if (l_ptr->owner->bclink.recv_permitted)
-			tipc_bclink_update_link_state(l_ptr->owner,
-						      msg_last_bcast(msg));
-
-		if (rec_gap || (msg_probe(msg))) {
-			tipc_link_proto_xmit(l_ptr, STATE_MSG, 0,
-					     rec_gap, 0, 0);
-		}
-		if (msg_seq_gap(msg)) {
-			l_ptr->stats.recv_nacks++;
-			tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq),
-					     msg_seq_gap(msg));
-		}
-		break;
-	}
-exit:
-	kfree_skb(buf);
-}
-
-
 /* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to
  * a different bearer. Owner node is locked.
  */
@@ -1496,7 +1365,7 @@ static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr,
 	struct sk_buff *skb;
 	u32 length = msg_size(msg);
 
-	tunnel = l_ptr->owner->active_links[selector & 1];
+	tunnel = node_active_link(l_ptr->owner, selector & 1);
 	if (!tipc_link_is_up(tunnel)) {
 		pr_warn("%stunnel link no longer available\n", link_co_err);
 		return;
@@ -1522,7 +1391,7 @@ static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr,
 void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
 {
 	int msgcount;
-	struct tipc_link *tunnel = l_ptr->owner->active_links[0];
+	struct tipc_link *tunnel = node_active_link(l_ptr->owner, 0);
 	struct tipc_msg tunnel_hdr;
 	struct sk_buff *skb;
 	int split_bundles;
@@ -1556,8 +1425,8 @@ void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
 		return;
 	}
 
-	split_bundles = (l_ptr->owner->active_links[0] !=
-			 l_ptr->owner->active_links[1]);
+	split_bundles = (node_active_link(l_ptr->owner, 0) !=
+			 node_active_link(l_ptr->owner, 0));
 
 	skb_queue_walk(&l_ptr->transmq, skb) {
 		struct tipc_msg *msg = buf_msg(skb);
@@ -1660,7 +1529,7 @@ static bool tipc_link_failover_rcv(struct tipc_link *link,
 	if (bearer_id == link->bearer_id)
 		goto exit;
 
-	pl = link->owner->links[bearer_id];
+	pl = link->owner->links[bearer_id].link;
 	if (pl && tipc_link_is_up(pl))
 		tipc_link_reset(pl);
 
@@ -1691,22 +1560,100 @@ static bool tipc_link_failover_rcv(struct tipc_link *link,
 	}
 exit:
 	if (!link->failover_pkts && pl)
-		pl->flags &= ~LINK_FAILINGOVER;
+		pl->exec_mode = TIPC_LINK_OPEN;
 	kfree_skb(*skb);
 	*skb = iskb;
 	return *skb;
 }
 
-static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol)
+/* tipc_link_proto_rcv(): receive link level protocol message :
+ * Note that network plane id propagates through the network, and may
+ * change at any time. The node with lowest numerical id determines
+ * network plane
+ */
+static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
+			       struct sk_buff_head *xmitq)
 {
-	unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
+	struct tipc_msg *hdr = buf_msg(skb);
+	u16 rcvgap = 0;
+	u16 nacked_gap = msg_seq_gap(hdr);
+	u16 peers_snd_nxt =  msg_next_sent(hdr);
+	u16 peers_tol = msg_link_tolerance(hdr);
+	u16 peers_prio = msg_linkprio(hdr);
+	char *if_name;
+	int rc = 0;
 
-	if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
-		return;
+	if (l->exec_mode == TIPC_LINK_BLOCKED)
+		goto exit;
+
+	if (link_own_addr(l) > msg_prevnode(hdr))
+		l->net_plane = msg_net_plane(hdr);
+
+	switch (msg_type(hdr)) {
+	case RESET_MSG:
+
+		/* Ignore duplicate RESET with old session number */
+		if ((less_eq(msg_session(hdr), l->peer_session)) &&
+		    (l->peer_session != WILDCARD_SESSION))
+			break;
+		/* fall thru' */
+	case ACTIVATE_MSG:
+
+		/* Complete own link name with peer's interface name */
+		if_name =  strrchr(l->name, ':') + 1;
+		if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
+			break;
+		if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
+			break;
+		strncpy(if_name, msg_data(hdr),	TIPC_MAX_IF_NAME);
+
+		/* Update own tolerance if peer indicates a non-zero value */
+		if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
+			l->tolerance = peers_tol;
 
-	l_ptr->tolerance = tol;
-	l_ptr->keepalive_intv = msecs_to_jiffies(intv);
-	l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->keepalive_intv));
+		/* Update own priority if peer's priority is higher */
+		if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
+			l->priority = peers_prio;
+
+		l->peer_session = msg_session(hdr);
+		l->peer_bearer_id = msg_bearer_id(hdr);
+		rc = tipc_link_fsm_evt(l, msg_type(hdr), xmitq);
+		if (l->mtu > msg_max_pkt(hdr))
+			l->mtu = msg_max_pkt(hdr);
+		break;
+	case STATE_MSG:
+		/* Update own tolerance if peer indicates a non-zero value */
+		if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
+			l->tolerance = peers_tol;
+
+		l->silent_intv_cnt = 0;
+		l->stats.recv_states++;
+		if (msg_probe(hdr))
+			l->stats.recv_probes++;
+		rc = tipc_link_fsm_evt(l, TRAFFIC_EVT, xmitq);
+		if (!tipc_link_is_up(l))
+			break;
+
+		/* Has peer sent packets we haven't received yet ? */
+		if (more(peers_snd_nxt, l->rcv_nxt))
+			rcvgap = peers_snd_nxt - l->rcv_nxt;
+		if (rcvgap || (msg_probe(hdr)))
+			tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
+						  0, 0, xmitq);
+		tipc_link_release_pkts(l, msg_ack(hdr));
+
+		/* If NACK, retransmit will now start at right position */
+		if (nacked_gap) {
+			rc |= tipc_link_retransm(l, nacked_gap, xmitq);
+			l->stats.recv_nacks++;
+		}
+		tipc_link_advance_backlog(l, xmitq);
+		if (unlikely(!skb_queue_empty(&l->wakeupq)))
+			link_prepare_wakeup(l);
+	}
+exit:
+	kfree_skb(skb);
+	return rc;
 }
 
 void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
@@ -1743,7 +1690,7 @@ static struct tipc_node *tipc_link_find_owner(struct net *net,
 	list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
 		tipc_node_lock(n_ptr);
 		for (i = 0; i < MAX_BEARERS; i++) {
-			l_ptr = n_ptr->links[i];
+			l_ptr = n_ptr->links[i].link;
 			if (l_ptr && !strcmp(l_ptr->name, link_name)) {
 				*bearer_id = i;
 				found_node = n_ptr;
@@ -1770,27 +1717,28 @@ static void link_reset_statistics(struct tipc_link *l_ptr)
 	l_ptr->stats.recv_info = l_ptr->rcv_nxt;
 }
 
-static void link_print(struct tipc_link *l_ptr, const char *str)
+static void link_print(struct tipc_link *l, const char *str)
 {
-	struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id);
-	struct tipc_bearer *b_ptr;
-
-	rcu_read_lock();
-	b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]);
-	if (b_ptr)
-		pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name);
-	rcu_read_unlock();
-
-	if (link_working_unknown(l_ptr))
-		pr_cont(":WU\n");
-	else if (link_reset_reset(l_ptr))
-		pr_cont(":RR\n");
-	else if (link_reset_unknown(l_ptr))
-		pr_cont(":RU\n");
-	else if (link_working_working(l_ptr))
-		pr_cont(":WW\n");
+	struct sk_buff *hskb = skb_peek(&l->transmq);
+	u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt;
+	u16 tail = l->snd_nxt - 1;
+
+	pr_info("%s Link <%s>:", str, l->name);
+
+	if (link_probing(l))
+		pr_cont(":P\n");
+	else if (link_establishing(l))
+		pr_cont(":E\n");
+	else if (link_resetting(l))
+		pr_cont(":R\n");
+	else if (link_working(l))
+		pr_cont(":W\n");
 	else
 		pr_cont("\n");
+
+	pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
+		skb_queue_len(&l->transmq), head, tail,
+		skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
 }
 
 /* Parse and validate nested (link) properties valid for media, bearer and link
@@ -1865,7 +1813,7 @@ int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
 
 	tipc_node_lock(node);
 
-	link = node->links[bearer_id];
+	link = node->links[bearer_id].link;
 	if (!link) {
 		res = -EINVAL;
 		goto out;
@@ -1885,7 +1833,7 @@ int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
 			u32 tol;
 
 			tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
-			link_set_supervision_props(link, tol);
+			link->tolerance = tol;
 			tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0);
 		}
 		if (props[TIPC_NLA_PROP_PRIO]) {
@@ -2055,10 +2003,11 @@ static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
 	for (i = *prev_link; i < MAX_BEARERS; i++) {
 		*prev_link = i;
 
-		if (!node->links[i])
+		if (!node->links[i].link)
 			continue;
 
-		err = __tipc_nl_add_link(net, msg, node->links[i], NLM_F_MULTI);
+		err = __tipc_nl_add_link(net, msg,
+					 node->links[i].link, NLM_F_MULTI);
 		if (err)
 			return err;
 	}
@@ -2172,7 +2121,7 @@ int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info)
 			return -EINVAL;
 
 		tipc_node_lock(node);
-		link = node->links[bearer_id];
+		link = node->links[bearer_id].link;
 		if (!link) {
 			tipc_node_unlock(node);
 			nlmsg_free(msg.skb);
@@ -2227,7 +2176,7 @@ int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
 
 	tipc_node_lock(node);
 
-	link = node->links[bearer_id];
+	link = node->links[bearer_id].link;
 	if (!link) {
 		tipc_node_unlock(node);
 		return -EINVAL;