3 files changed, 37 insertions, 16 deletions

diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index 933445337fb4..164d08907d6f 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -35,7 +35,7 @@
  */
 
 #include "core.h"
-#include "link.h"
+#include "node.h"
 #include "discover.h"
 
 /* min delay during bearer start up */
@@ -125,7 +125,6 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *buf,
 {
 	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	struct tipc_node *node;
-	struct tipc_link *link;
 	struct tipc_media_addr maddr;
 	struct sk_buff *rbuf;
 	struct tipc_msg *msg = buf_msg(buf);
@@ -170,13 +169,10 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *buf,
 		return;
 	tipc_node_lock(node);
 	node->capabilities = caps;
-	link = node->links[bearer->identity].link;
 
 	/* Prepare to validate requesting node's signature and media address */
 	sign_match = (signature == node->signature);
-	addr_match = link && !memcmp(&link->media_addr, &maddr, sizeof(maddr));
-	link_up = link && tipc_link_is_up(link);
-
+	tipc_node_check_dest(node, bearer, &link_up, &addr_match, &maddr);
 
 	/* These three flags give us eight permutations: */
 
@@ -239,16 +235,8 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *buf,
 	if (accept_sign)
 		node->signature = signature;
 
-	if (accept_addr) {
-		if (!link)
-			link = tipc_link_create(node, bearer, &maddr);
-		if (link) {
-			memcpy(&link->media_addr, &maddr, sizeof(maddr));
-			tipc_link_reset(link);
-		} else {
-			respond = false;
-		}
-	}
+	if (accept_addr && !tipc_node_update_dest(node, bearer, &maddr))
+		respond = false;
 
 	/* Send response, if necessary */
 	if (respond && (mtyp == DSC_REQ_MSG)) {
diff --git a/net/tipc/node.c b/net/tipc/node.c
index db46e5d1d156..06f642abdf38 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -334,6 +334,33 @@ bool tipc_node_is_up(struct tipc_node *n)
 	return n->active_links[0];
 }
 
+void tipc_node_check_dest(struct tipc_node *n, struct tipc_bearer *b,
+			  bool *link_up, bool *addr_match,
+			  struct tipc_media_addr *maddr)
+{
+	struct tipc_link *l = n->links[b->identity].link;
+	struct tipc_media_addr *curr = &n->links[b->identity].maddr;
+
+	*link_up = l && tipc_link_is_up(l);
+	*addr_match = l && !memcmp(curr, maddr, sizeof(*maddr));
+}
+
+bool tipc_node_update_dest(struct tipc_node *n,  struct tipc_bearer *b,
+			   struct tipc_media_addr *maddr)
+{
+	struct tipc_link *l = n->links[b->identity].link;
+	struct tipc_media_addr *curr = &n->links[b->identity].maddr;
+
+	if (!l)
+		l = tipc_link_create(n, b, maddr);
+	if (!l)
+		return false;
+	memcpy(&l->media_addr, maddr, sizeof(*maddr));
+	memcpy(curr, maddr, sizeof(*maddr));
+	tipc_link_reset(l);
+	return true;
+}
+
 void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr)
 {
 	n_ptr->links[l_ptr->bearer_id].link = l_ptr;
diff --git a/net/tipc/node.h b/net/tipc/node.h
index 320cea313bdc..68579c70748b 100644
--- a/net/tipc/node.h
+++ b/net/tipc/node.h
@@ -92,6 +92,7 @@ struct tipc_node_bclink {
 struct tipc_link_entry {
 	struct tipc_link *link;
 	u32 mtu;
+	struct tipc_media_addr maddr;
 };
 
 /**
@@ -143,6 +144,11 @@ struct tipc_node *tipc_node_find(struct net *net, u32 addr);
 void tipc_node_put(struct tipc_node *node);
 struct tipc_node *tipc_node_create(struct net *net, u32 addr);
 void tipc_node_stop(struct net *net);
+void tipc_node_check_dest(struct tipc_node *n, struct tipc_bearer *bearer,
+			  bool *link_up, bool *addr_match,
+			  struct tipc_media_addr *maddr);
+bool tipc_node_update_dest(struct tipc_node *n, struct tipc_bearer *bearer,
+			   struct tipc_media_addr *maddr);
 void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
 void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr);
 void tipc_node_link_down(struct tipc_node *n_ptr, int bearer_id);