Merge branch 'master' into for-next

Sync with Linus' tree so that patches against newer codebase can be applied.

Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 360 insertions, 395 deletions

diff --git a/net/tipc/link.c b/net/tipc/link.c
index 9efbdbde2b08..7d2bb3e70baa 100644
--- a/net/tipc/link.c
+++ b/net/tipc/link.c
@@ -1,7 +1,7 @@
 /*
  * net/tipc/link.c: TIPC link code
  *
- * Copyright (c) 1996-2007, 2012-2015, Ericsson AB
+ * Copyright (c) 1996-2007, 2012-2016, Ericsson AB
  * Copyright (c) 2004-2007, 2010-2013, Wind River Systems
  * All rights reserved.
  *
@@ -45,36 +45,152 @@
 
 #include <linux/pkt_sched.h>
 
+struct tipc_stats {
+	u32 sent_info;		/* used in counting # sent packets */
+	u32 recv_info;		/* used in counting # recv'd packets */
+	u32 sent_states;
+	u32 recv_states;
+	u32 sent_probes;
+	u32 recv_probes;
+	u32 sent_nacks;
+	u32 recv_nacks;
+	u32 sent_acks;
+	u32 sent_bundled;
+	u32 sent_bundles;
+	u32 recv_bundled;
+	u32 recv_bundles;
+	u32 retransmitted;
+	u32 sent_fragmented;
+	u32 sent_fragments;
+	u32 recv_fragmented;
+	u32 recv_fragments;
+	u32 link_congs;		/* # port sends blocked by congestion */
+	u32 deferred_recv;
+	u32 duplicates;
+	u32 max_queue_sz;	/* send queue size high water mark */
+	u32 accu_queue_sz;	/* used for send queue size profiling */
+	u32 queue_sz_counts;	/* used for send queue size profiling */
+	u32 msg_length_counts;	/* used for message length profiling */
+	u32 msg_lengths_total;	/* used for message length profiling */
+	u32 msg_length_profile[7]; /* used for msg. length profiling */
+};
+
+/**
+ * struct tipc_link - TIPC link data structure
+ * @addr: network address of link's peer node
+ * @name: link name character string
+ * @media_addr: media address to use when sending messages over link
+ * @timer: link timer
+ * @net: pointer to namespace struct
+ * @refcnt: reference counter for permanent references (owner node & timer)
+ * @peer_session: link session # being used by peer end of link
+ * @peer_bearer_id: bearer id used by link's peer endpoint
+ * @bearer_id: local bearer id used by link
+ * @tolerance: minimum link continuity loss needed to reset link [in ms]
+ * @keepalive_intv: link keepalive timer interval
+ * @abort_limit: # of unacknowledged continuity probes needed to reset link
+ * @state: current state of link FSM
+ * @peer_caps: bitmap describing capabilities of peer node
+ * @silent_intv_cnt: # of timer intervals without any reception from peer
+ * @proto_msg: template for control messages generated by link
+ * @pmsg: convenience pointer to "proto_msg" field
+ * @priority: current link priority
+ * @net_plane: current link network plane ('A' through 'H')
+ * @backlog_limit: backlog queue congestion thresholds (indexed by importance)
+ * @exp_msg_count: # of tunnelled messages expected during link changeover
+ * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset
+ * @mtu: current maximum packet size for this link
+ * @advertised_mtu: advertised own mtu when link is being established
+ * @transmitq: queue for sent, non-acked messages
+ * @backlogq: queue for messages waiting to be sent
+ * @snt_nxt: next sequence number to use for outbound messages
+ * @last_retransmitted: sequence number of most recently retransmitted message
+ * @stale_count: # of identical retransmit requests made by peer
+ * @ackers: # of peers that needs to ack each packet before it can be released
+ * @acked: # last packet acked by a certain peer. Used for broadcast.
+ * @rcv_nxt: next sequence number to expect for inbound messages
+ * @deferred_queue: deferred queue saved OOS b'cast message received from node
+ * @unacked_window: # of inbound messages rx'd without ack'ing back to peer
+ * @inputq: buffer queue for messages to be delivered upwards
+ * @namedq: buffer queue for name table messages to be delivered upwards
+ * @next_out: ptr to first unsent outbound message in queue
+ * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate
+ * @long_msg_seq_no: next identifier to use for outbound fragmented messages
+ * @reasm_buf: head of partially reassembled inbound message fragments
+ * @bc_rcvr: marks that this is a broadcast receiver link
+ * @stats: collects statistics regarding link activity
+ */
+struct tipc_link {
+	u32 addr;
+	char name[TIPC_MAX_LINK_NAME];
+	struct net *net;
+
+	/* Management and link supervision data */
+	u32 peer_session;
+	u32 session;
+	u32 peer_bearer_id;
+	u32 bearer_id;
+	u32 tolerance;
+	unsigned long keepalive_intv;
+	u32 abort_limit;
+	u32 state;
+	u16 peer_caps;
+	bool active;
+	u32 silent_intv_cnt;
+	char if_name[TIPC_MAX_IF_NAME];
+	u32 priority;
+	char net_plane;
+
+	/* Failover/synch */
+	u16 drop_point;
+	struct sk_buff *failover_reasm_skb;
+
+	/* Max packet negotiation */
+	u16 mtu;
+	u16 advertised_mtu;
+
+	/* Sending */
+	struct sk_buff_head transmq;
+	struct sk_buff_head backlogq;
+	struct {
+		u16 len;
+		u16 limit;
+	} backlog[5];
+	u16 snd_nxt;
+	u16 last_retransm;
+	u16 window;
+	u32 stale_count;
+
+	/* Reception */
+	u16 rcv_nxt;
+	u32 rcv_unacked;
+	struct sk_buff_head deferdq;
+	struct sk_buff_head *inputq;
+	struct sk_buff_head *namedq;
+
+	/* Congestion handling */
+	struct sk_buff_head wakeupq;
+
+	/* Fragmentation/reassembly */
+	struct sk_buff *reasm_buf;
+
+	/* Broadcast */
+	u16 ackers;
+	u16 acked;
+	struct tipc_link *bc_rcvlink;
+	struct tipc_link *bc_sndlink;
+	int nack_state;
+	bool bc_peer_is_up;
+
+	/* Statistics */
+	struct tipc_stats stats;
+};
+
 /*
  * Error message prefixes
  */
 static const char *link_co_err = "Link tunneling error, ";
 static const char *link_rst_msg = "Resetting link ";
-static const char tipc_bclink_name[] = "broadcast-link";
-
-static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
-	[TIPC_NLA_LINK_UNSPEC]		= { .type = NLA_UNSPEC },
-	[TIPC_NLA_LINK_NAME] = {
-		.type = NLA_STRING,
-		.len = TIPC_MAX_LINK_NAME
-	},
-	[TIPC_NLA_LINK_MTU]		= { .type = NLA_U32 },
-	[TIPC_NLA_LINK_BROADCAST]	= { .type = NLA_FLAG },
-	[TIPC_NLA_LINK_UP]		= { .type = NLA_FLAG },
-	[TIPC_NLA_LINK_ACTIVE]		= { .type = NLA_FLAG },
-	[TIPC_NLA_LINK_PROP]		= { .type = NLA_NESTED },
-	[TIPC_NLA_LINK_STATS]		= { .type = NLA_NESTED },
-	[TIPC_NLA_LINK_RX]		= { .type = NLA_U32 },
-	[TIPC_NLA_LINK_TX]		= { .type = NLA_U32 }
-};
-
-/* Properties valid for media, bearar and link */
-static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
-	[TIPC_NLA_PROP_UNSPEC]		= { .type = NLA_UNSPEC },
-	[TIPC_NLA_PROP_PRIO]		= { .type = NLA_U32 },
-	[TIPC_NLA_PROP_TOL]		= { .type = NLA_U32 },
-	[TIPC_NLA_PROP_WIN]		= { .type = NLA_U32 }
-};
 
 /* Send states for broadcast NACKs
  */
@@ -88,10 +204,11 @@ enum {
  * Interval between NACKs when packets arrive out of order
  */
 #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
-/*
- * Out-of-range value for link session numbers
+
+/* Wildcard value for link session numbers. When it is known that
+ * peer endpoint is down, any session number must be accepted.
  */
-#define WILDCARD_SESSION 0x10000
+#define ANY_SESSION 0x10000
 
 /* Link FSM states:
  */
@@ -117,8 +234,7 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
 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 link_print(struct tipc_link *l, const char *str);
 static void tipc_link_build_nack_msg(struct tipc_link *l,
 				     struct sk_buff_head *xmitq);
 static void tipc_link_build_bc_init_msg(struct tipc_link *l,
@@ -183,6 +299,36 @@ void tipc_link_set_active(struct tipc_link *l, bool active)
 	l->active = active;
 }
 
+u32 tipc_link_id(struct tipc_link *l)
+{
+	return l->peer_bearer_id << 16 | l->bearer_id;
+}
+
+int tipc_link_window(struct tipc_link *l)
+{
+	return l->window;
+}
+
+int tipc_link_prio(struct tipc_link *l)
+{
+	return l->priority;
+}
+
+unsigned long tipc_link_tolerance(struct tipc_link *l)
+{
+	return l->tolerance;
+}
+
+struct sk_buff_head *tipc_link_inputq(struct tipc_link *l)
+{
+	return l->inputq;
+}
+
+char tipc_link_plane(struct tipc_link *l)
+{
+	return l->net_plane;
+}
+
 void tipc_link_add_bc_peer(struct tipc_link *snd_l,
 			   struct tipc_link *uc_l,
 			   struct sk_buff_head *xmitq)
@@ -191,6 +337,7 @@ void tipc_link_add_bc_peer(struct tipc_link *snd_l,
 
 	snd_l->ackers++;
 	rcv_l->acked = snd_l->snd_nxt - 1;
+	snd_l->state = LINK_ESTABLISHED;
 	tipc_link_build_bc_init_msg(uc_l, xmitq);
 }
 
@@ -206,6 +353,7 @@ void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
 	rcv_l->state = LINK_RESET;
 	if (!snd_l->ackers) {
 		tipc_link_reset(snd_l);
+		snd_l->state = LINK_RESET;
 		__skb_queue_purge(xmitq);
 	}
 }
@@ -225,9 +373,19 @@ int tipc_link_mtu(struct tipc_link *l)
 	return l->mtu;
 }
 
-static u32 link_own_addr(struct tipc_link *l)
+u16 tipc_link_rcv_nxt(struct tipc_link *l)
+{
+	return l->rcv_nxt;
+}
+
+u16 tipc_link_acked(struct tipc_link *l)
 {
-	return msg_prevnode(l->pmsg);
+	return l->acked;
+}
+
+char *tipc_link_name(struct tipc_link *l)
+{
+	return l->name;
 }
 
 /**
@@ -263,29 +421,22 @@ bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
 		      struct tipc_link **link)
 {
 	struct tipc_link *l;
-	struct tipc_msg *hdr;
 
 	l = kzalloc(sizeof(*l), GFP_ATOMIC);
 	if (!l)
 		return false;
 	*link = l;
-	l->pmsg = (struct tipc_msg *)&l->proto_msg;
-	hdr = l->pmsg;
-	tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer);
-	msg_set_size(hdr, sizeof(l->proto_msg));
-	msg_set_session(hdr, session);
-	msg_set_bearer_id(hdr, l->bearer_id);
+	l->session = session;
 
 	/* Note: peer i/f name is completed by reset/activate message */
 	sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
 		tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode),
 		if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
-	strcpy((char *)msg_data(hdr), if_name);
-
+	strcpy(l->if_name, if_name);
 	l->addr = peer;
 	l->peer_caps = peer_caps;
 	l->net = net;
-	l->peer_session = WILDCARD_SESSION;
+	l->peer_session = ANY_SESSION;
 	l->bearer_id = bearer_id;
 	l->tolerance = tolerance;
 	l->net_plane = net_plane;
@@ -612,7 +763,7 @@ static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
 	struct tipc_msg *msg = buf_msg(skb_peek(list));
 	int imp = msg_importance(msg);
 	u32 oport = msg_origport(msg);
-	u32 addr = link_own_addr(link);
+	u32 addr = tipc_own_addr(link->net);
 	struct sk_buff *skb;
 
 	/* This really cannot happen...  */
@@ -661,16 +812,9 @@ void link_prepare_wakeup(struct tipc_link *l)
 
 void tipc_link_reset(struct tipc_link *l)
 {
-	/* Link is down, accept any session */
-	l->peer_session = WILDCARD_SESSION;
-
-	/* If peer is up, it only accepts an incremented session number */
-	msg_set_session(l->pmsg, msg_session(l->pmsg) + 1);
-
-	/* Prepare for renewed mtu size negotiation */
+	l->peer_session = ANY_SESSION;
+	l->session++;
 	l->mtu = l->advertised_mtu;
-
-	/* Clean up all queues and counters: */
 	__skb_queue_purge(&l->transmq);
 	__skb_queue_purge(&l->deferdq);
 	skb_queue_splice_init(&l->wakeupq, l->inputq);
@@ -692,7 +836,7 @@ void tipc_link_reset(struct tipc_link *l)
 	l->stats.recv_info = 0;
 	l->stale_count = 0;
 	l->bc_peer_is_up = false;
-	link_reset_statistics(l);
+	tipc_link_reset_stats(l);
 }
 
 /**
@@ -725,8 +869,10 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
 		if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
 			return link_schedule_user(l, list);
 	}
-	if (unlikely(msg_size(hdr) > mtu))
+	if (unlikely(msg_size(hdr) > mtu)) {
+		skb_queue_purge(list);
 		return -EMSGSIZE;
+	}
 
 	/* Prepare each packet for sending, and add to relevant queue: */
 	while (skb_queue_len(list)) {
@@ -738,8 +884,10 @@ int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list,
 
 		if (likely(skb_queue_len(transmq) < maxwin)) {
 			_skb = skb_clone(skb, GFP_ATOMIC);
-			if (!_skb)
+			if (!_skb) {
+				skb_queue_purge(list);
 				return -ENOBUFS;
+			}
 			__skb_dequeue(list);
 			__skb_queue_tail(transmq, skb);
 			__skb_queue_tail(xmitq, _skb);
@@ -974,7 +1122,7 @@ int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
 
 	/* Broadcast ACK must be sent via a unicast link => defer to caller */
 	if (link_is_bc_rcvlink(l)) {
-		if (((l->rcv_nxt ^ link_own_addr(l)) & 0xf) != 0xf)
+		if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf)
 			return 0;
 		l->rcv_unacked = 0;
 		return TIPC_LINK_SND_BC_ACK;
@@ -1082,38 +1230,34 @@ drop:
 	return rc;
 }
 
-/*
- * Send protocol message to the other endpoint.
- */
-void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg,
-			  u32 gap, u32 tolerance, u32 priority)
-{
-	struct sk_buff *skb = NULL;
-	struct sk_buff_head xmitq;
-
-	__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;
-	tipc_bearer_xmit_skb(l->net, l->bearer_id, skb, l->media_addr);
-	l->rcv_unacked = 0;
-}
-
 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 *skb = NULL;
-	struct tipc_msg *hdr = l->pmsg;
+	struct sk_buff *skb;
+	struct tipc_msg *hdr;
+	struct sk_buff_head *dfq = &l->deferdq;
 	bool node_up = link_is_up(l->bc_rcvlink);
 
 	/* Don't send protocol message during reset or link failover */
 	if (tipc_link_is_blocked(l))
 		return;
 
-	msg_set_type(hdr, mtyp);
+	if (!tipc_link_is_up(l) && (mtyp == STATE_MSG))
+		return;
+
+	if (!skb_queue_empty(dfq))
+		rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt;
+
+	skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE,
+			      TIPC_MAX_IF_NAME, l->addr,
+			      tipc_own_addr(l->net), 0, 0, 0);
+	if (!skb)
+		return;
+
+	hdr = buf_msg(skb);
+	msg_set_session(hdr, l->session);
+	msg_set_bearer_id(hdr, l->bearer_id);
 	msg_set_net_plane(hdr, l->net_plane);
 	msg_set_next_sent(hdr, l->snd_nxt);
 	msg_set_ack(hdr, l->rcv_nxt - 1);
@@ -1123,36 +1267,23 @@ static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
 	msg_set_linkprio(hdr, priority);
 	msg_set_redundant_link(hdr, node_up);
 	msg_set_seq_gap(hdr, 0);
-
-	/* Compatibility: created msg must not be in sequence with pkt flow */
 	msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2);
 
 	if (mtyp == STATE_MSG) {
-		if (!tipc_link_is_up(l))
-			return;
-
-		/* Override rcvgap if there are packets in deferred queue */
-		if (!skb_queue_empty(&l->deferdq))
-			rcvgap = buf_seqno(skb_peek(&l->deferdq)) - l->rcv_nxt;
-		if (rcvgap) {
-			msg_set_seq_gap(hdr, rcvgap);
-			l->stats.sent_nacks++;
-		}
+		msg_set_seq_gap(hdr, rcvgap);
+		msg_set_size(hdr, INT_H_SIZE);
 		msg_set_probe(hdr, probe);
-		if (probe)
-			l->stats.sent_probes++;
 		l->stats.sent_states++;
 		l->rcv_unacked = 0;
 	} else {
 		/* RESET_MSG or ACTIVATE_MSG */
 		msg_set_max_pkt(hdr, l->advertised_mtu);
-		msg_set_ack(hdr, l->rcv_nxt - 1);
-		msg_set_next_sent(hdr, 1);
+		strcpy(msg_data(hdr), l->if_name);
 	}
-	skb = tipc_buf_acquire(msg_size(hdr));
-	if (!skb)
-		return;
-	skb_copy_to_linear_data(skb, hdr, msg_size(hdr));
+	if (probe)
+		l->stats.sent_probes++;
+	if (rcvgap)
+		l->stats.sent_nacks++;
 	skb->priority = TC_PRIO_CONTROL;
 	__skb_queue_tail(xmitq, skb);
 }
@@ -1177,7 +1308,7 @@ void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
 
 	/* At least one packet required for safe algorithm => add dummy */
 	skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
-			      BASIC_H_SIZE, 0, l->addr, link_own_addr(l),
+			      BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net),
 			      0, 0, TIPC_ERR_NO_PORT);
 	if (!skb) {
 		pr_warn("%sunable to create tunnel packet\n", link_co_err);
@@ -1188,7 +1319,7 @@ void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
 	__skb_queue_purge(&tmpxq);
 
 	/* Initialize reusable tunnel packet header */
-	tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL,
+	tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL,
 		      mtyp, INT_H_SIZE, l->addr);
 	pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq);
 	msg_set_msgcnt(&tnlhdr, pktcnt);
@@ -1247,7 +1378,7 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
 	if (tipc_link_is_blocked(l) || !xmitq)
 		goto exit;
 
-	if (link_own_addr(l) > msg_prevnode(hdr))
+	if (tipc_own_addr(l->net) > msg_prevnode(hdr))
 		l->net_plane = msg_net_plane(hdr);
 
 	switch (mtyp) {
@@ -1255,11 +1386,13 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
 
 		/* Ignore duplicate RESET with old session number */
 		if ((less_eq(msg_session(hdr), l->peer_session)) &&
-		    (l->peer_session != WILDCARD_SESSION))
+		    (l->peer_session != ANY_SESSION))
 			break;
 		/* fall thru' */
 
 	case ACTIVATE_MSG:
+		skb_linearize(skb);
+		hdr = buf_msg(skb);
 
 		/* Complete own link name with peer's interface name */
 		if_name =  strrchr(l->name, ':') + 1;
@@ -1297,6 +1430,12 @@ static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
 		if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
 			l->tolerance = peers_tol;
 
+		if (peers_prio && in_range(peers_prio, TIPC_MIN_LINK_PRI,
+					   TIPC_MAX_LINK_PRI)) {
+			l->priority = peers_prio;
+			rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
+		}
+
 		l->silent_intv_cnt = 0;
 		l->stats.recv_states++;
 		if (msg_probe(hdr))
@@ -1344,7 +1483,7 @@ static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast,
 	u16 gap_to = peers_snd_nxt - 1;
 
 	skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
-			      0, l->addr, link_own_addr(l), 0, 0, 0);
+			      0, l->addr, tipc_own_addr(l->net), 0, 0, 0);
 	if (!skb)
 		return false;
 	hdr = buf_msg(skb);
@@ -1499,7 +1638,7 @@ int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
 	if (mtyp != STATE_MSG)
 		return 0;
 
-	if (dnode == link_own_addr(l)) {
+	if (dnode == tipc_own_addr(l->net)) {
 		tipc_link_bc_ack_rcv(l, acked, xmitq);
 		rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq);
 		l->stats.recv_nacks++;
@@ -1525,53 +1664,17 @@ void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
 	l->backlog[TIPC_SYSTEM_IMPORTANCE].limit   = max_bulk;
 }
 
-/* tipc_link_find_owner - locate owner node of link by link's name
- * @net: the applicable net namespace
- * @name: pointer to link name string
- * @bearer_id: pointer to index in 'node->links' array where the link was found.
- *
- * Returns pointer to node owning the link, or 0 if no matching link is found.
- */
-static struct tipc_node *tipc_link_find_owner(struct net *net,
-					      const char *link_name,
-					      unsigned int *bearer_id)
-{
-	struct tipc_net *tn = net_generic(net, tipc_net_id);
-	struct tipc_link *l_ptr;
-	struct tipc_node *n_ptr;
-	struct tipc_node *found_node = NULL;
-	int i;
-
-	*bearer_id = 0;
-	rcu_read_lock();
-	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].link;
-			if (l_ptr && !strcmp(l_ptr->name, link_name)) {
-				*bearer_id = i;
-				found_node = n_ptr;
-				break;
-			}
-		}
-		tipc_node_unlock(n_ptr);
-		if (found_node)
-			break;
-	}
-	rcu_read_unlock();
-
-	return found_node;
-}
-
 /**
- * link_reset_statistics - reset link statistics
- * @l_ptr: pointer to link
+ * link_reset_stats - reset link statistics
+ * @l: pointer to link
  */
-static void link_reset_statistics(struct tipc_link *l_ptr)
+void tipc_link_reset_stats(struct tipc_link *l)
 {
-	memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
-	l_ptr->stats.sent_info = l_ptr->snd_nxt;
-	l_ptr->stats.recv_info = l_ptr->rcv_nxt;
+	memset(&l->stats, 0, sizeof(l->stats));
+	if (!link_is_bc_sndlink(l)) {
+		l->stats.sent_info = l->snd_nxt;
+		l->stats.recv_info = l->rcv_nxt;
+	}
 }
 
 static void link_print(struct tipc_link *l, const char *str)
@@ -1624,84 +1727,6 @@ int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
 	return 0;
 }
 
-int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
-{
-	int err;
-	int res = 0;
-	int bearer_id;
-	char *name;
-	struct tipc_link *link;
-	struct tipc_node *node;
-	struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
-	struct net *net = sock_net(skb->sk);
-
-	if (!info->attrs[TIPC_NLA_LINK])
-		return -EINVAL;
-
-	err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
-			       info->attrs[TIPC_NLA_LINK],
-			       tipc_nl_link_policy);
-	if (err)
-		return err;
-
-	if (!attrs[TIPC_NLA_LINK_NAME])
-		return -EINVAL;
-
-	name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
-
-	if (strcmp(name, tipc_bclink_name) == 0)
-		return tipc_nl_bc_link_set(net, attrs);
-
-	node = tipc_link_find_owner(net, name, &bearer_id);
-	if (!node)
-		return -EINVAL;
-
-	tipc_node_lock(node);
-
-	link = node->links[bearer_id].link;
-	if (!link) {
-		res = -EINVAL;
-		goto out;
-	}
-
-	if (attrs[TIPC_NLA_LINK_PROP]) {
-		struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
-
-		err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
-					      props);
-		if (err) {
-			res = err;
-			goto out;
-		}
-
-		if (props[TIPC_NLA_PROP_TOL]) {
-			u32 tol;
-
-			tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
-			link->tolerance = tol;
-			tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0);
-		}
-		if (props[TIPC_NLA_PROP_PRIO]) {
-			u32 prio;
-
-			prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
-			link->priority = prio;
-			tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio);
-		}
-		if (props[TIPC_NLA_PROP_WIN]) {
-			u32 win;
-
-			win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
-			tipc_link_set_queue_limits(link, win);
-		}
-	}
-
-out:
-	tipc_node_unlock(node);
-
-	return res;
-}
-
 static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
 {
 	int i;
@@ -1768,8 +1793,8 @@ msg_full:
 }
 
 /* Caller should hold appropriate locks to protect the link */
-static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
-			      struct tipc_link *link, int nlflags)
+int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
+		       struct tipc_link *link, int nlflags)
 {
 	int err;
 	void *hdr;
@@ -1838,198 +1863,138 @@ msg_full:
 	return -EMSGSIZE;
 }
 
-/* Caller should hold node lock  */
-static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
-				    struct tipc_node *node, u32 *prev_link)
+static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb,
+				      struct tipc_stats *stats)
 {
-	u32 i;
-	int err;
-
-	for (i = *prev_link; i < MAX_BEARERS; i++) {
-		*prev_link = i;
-
-		if (!node->links[i].link)
-			continue;
+	int i;
+	struct nlattr *nest;
 
-		err = __tipc_nl_add_link(net, msg,
-					 node->links[i].link, NLM_F_MULTI);
-		if (err)
-			return err;
-	}
-	*prev_link = 0;
+	struct nla_map {
+		__u32 key;
+		__u32 val;
+	};
 
-	return 0;
-}
+	struct nla_map map[] = {
+		{TIPC_NLA_STATS_RX_INFO, stats->recv_info},
+		{TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments},
+		{TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented},
+		{TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles},
+		{TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled},
+		{TIPC_NLA_STATS_TX_INFO, stats->sent_info},
+		{TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments},
+		{TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented},
+		{TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles},
+		{TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled},
+		{TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks},
+		{TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv},
+		{TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks},
+		{TIPC_NLA_STATS_TX_ACKS, stats->sent_acks},
+		{TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted},
+		{TIPC_NLA_STATS_DUPLICATES, stats->duplicates},
+		{TIPC_NLA_STATS_LINK_CONGS, stats->link_congs},
+		{TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz},
+		{TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ?
+			(stats->accu_queue_sz / stats->queue_sz_counts) : 0}
+	};
 
-int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb)
-{
-	struct net *net = sock_net(skb->sk);
-	struct tipc_net *tn = net_generic(net, tipc_net_id);
-	struct tipc_node *node;
-	struct tipc_nl_msg msg;
-	u32 prev_node = cb->args[0];
-	u32 prev_link = cb->args[1];
-	int done = cb->args[2];
-	int err;
+	nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
+	if (!nest)
+		return -EMSGSIZE;
 
-	if (done)
-		return 0;
+	for (i = 0; i <  ARRAY_SIZE(map); i++)
+		if (nla_put_u32(skb, map[i].key, map[i].val))
+			goto msg_full;
 
-	msg.skb = skb;
-	msg.portid = NETLINK_CB(cb->skb).portid;
-	msg.seq = cb->nlh->nlmsg_seq;
-
-	rcu_read_lock();
-	if (prev_node) {
-		node = tipc_node_find(net, prev_node);
-		if (!node) {
-			/* We never set seq or call nl_dump_check_consistent()
-			 * this means that setting prev_seq here will cause the
-			 * consistence check to fail in the netlink callback
-			 * handler. Resulting in the last NLMSG_DONE message
-			 * having the NLM_F_DUMP_INTR flag set.
-			 */
-			cb->prev_seq = 1;
-			goto out;
-		}
-		tipc_node_put(node);
-
-		list_for_each_entry_continue_rcu(node, &tn->node_list,
-						 list) {
-			tipc_node_lock(node);
-			err = __tipc_nl_add_node_links(net, &msg, node,
-						       &prev_link);
-			tipc_node_unlock(node);
-			if (err)
-				goto out;
-
-			prev_node = node->addr;
-		}
-	} else {
-		err = tipc_nl_add_bc_link(net, &msg);
-		if (err)
-			goto out;
-
-		list_for_each_entry_rcu(node, &tn->node_list, list) {
-			tipc_node_lock(node);
-			err = __tipc_nl_add_node_links(net, &msg, node,
-						       &prev_link);
-			tipc_node_unlock(node);
-			if (err)
-				goto out;
-
-			prev_node = node->addr;
-		}
-	}
-	done = 1;
-out:
-	rcu_read_unlock();
+	nla_nest_end(skb, nest);
 
-	cb->args[0] = prev_node;
-	cb->args[1] = prev_link;
-	cb->args[2] = done;
+	return 0;
+msg_full:
+	nla_nest_cancel(skb, nest);
 
-	return skb->len;
+	return -EMSGSIZE;
 }
 
-int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info)
+int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg)
 {
-	struct net *net = genl_info_net(info);
-	struct tipc_nl_msg msg;
-	char *name;
 	int err;
+	void *hdr;
+	struct nlattr *attrs;
+	struct nlattr *prop;
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
+	struct tipc_link *bcl = tn->bcl;
 
-	msg.portid = info->snd_portid;
-	msg.seq = info->snd_seq;
-
-	if (!info->attrs[TIPC_NLA_LINK_NAME])
-		return -EINVAL;
-	name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
+	if (!bcl)
+		return 0;
 
-	msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
-	if (!msg.skb)
-		return -ENOMEM;
+	tipc_bcast_lock(net);
 
-	if (strcmp(name, tipc_bclink_name) == 0) {
-		err = tipc_nl_add_bc_link(net, &msg);
-		if (err) {
-			nlmsg_free(msg.skb);
-			return err;
-		}
-	} else {
-		int bearer_id;
-		struct tipc_node *node;
-		struct tipc_link *link;
+	hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
+			  NLM_F_MULTI, TIPC_NL_LINK_GET);
+	if (!hdr) {
+		tipc_bcast_unlock(net);
+		return -EMSGSIZE;
+	}
 
-		node = tipc_link_find_owner(net, name, &bearer_id);
-		if (!node)
-			return -EINVAL;
+	attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
+	if (!attrs)
+		goto msg_full;
 
-		tipc_node_lock(node);
-		link = node->links[bearer_id].link;
-		if (!link) {
-			tipc_node_unlock(node);
-			nlmsg_free(msg.skb);
-			return -EINVAL;
-		}
+	/* The broadcast link is always up */
+	if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
+		goto attr_msg_full;
 
-		err = __tipc_nl_add_link(net, &msg, link, 0);
-		tipc_node_unlock(node);
-		if (err) {
-			nlmsg_free(msg.skb);
-			return err;
-		}
-	}
+	if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST))
+		goto attr_msg_full;
+	if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name))
+		goto attr_msg_full;
+	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt))
+		goto attr_msg_full;
+	if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt))
+		goto attr_msg_full;
 
-	return genlmsg_reply(msg.skb, info);
-}
+	prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
+	if (!prop)
+		goto attr_msg_full;
+	if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window))
+		goto prop_msg_full;
+	nla_nest_end(msg->skb, prop);
 
-int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
-{
-	int err;
-	char *link_name;
-	unsigned int bearer_id;
-	struct tipc_link *link;
-	struct tipc_node *node;
-	struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
-	struct net *net = sock_net(skb->sk);
-
-	if (!info->attrs[TIPC_NLA_LINK])
-		return -EINVAL;
-
-	err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
-			       info->attrs[TIPC_NLA_LINK],
-			       tipc_nl_link_policy);
+	err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats);
 	if (err)
-		return err;
-
-	if (!attrs[TIPC_NLA_LINK_NAME])
-		return -EINVAL;
-
-	link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
+		goto attr_msg_full;
 
-	if (strcmp(link_name, tipc_bclink_name) == 0) {
-		err = tipc_bclink_reset_stats(net);
-		if (err)
-			return err;
-		return 0;
-	}
+	tipc_bcast_unlock(net);
+	nla_nest_end(msg->skb, attrs);
+	genlmsg_end(msg->skb, hdr);
 
-	node = tipc_link_find_owner(net, link_name, &bearer_id);
-	if (!node)
-		return -EINVAL;
+	return 0;
 
-	tipc_node_lock(node);
+prop_msg_full:
+	nla_nest_cancel(msg->skb, prop);
+attr_msg_full:
+	nla_nest_cancel(msg->skb, attrs);
+msg_full:
+	tipc_bcast_unlock(net);
+	genlmsg_cancel(msg->skb, hdr);
 
-	link = node->links[bearer_id].link;
-	if (!link) {
-		tipc_node_unlock(node);
-		return -EINVAL;
-	}
+	return -EMSGSIZE;
+}
 
-	link_reset_statistics(link);
+void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
+			     struct sk_buff_head *xmitq)
+{
+	l->tolerance = tol;
+	tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, tol, 0, xmitq);
+}
 
-	tipc_node_unlock(node);
+void tipc_link_set_prio(struct tipc_link *l, u32 prio,
+			struct sk_buff_head *xmitq)
+{
+	l->priority = prio;
+	tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, prio, xmitq);
+}
 
-	return 0;
+void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit)
+{
+	l->abort_limit = limit;
 }