tipc: Introduce node signature field in neighbor discovery message

Adds support for the new "node signature" in neighbor discovery messages,
which is a 16 bit identifier chosen randomly when TIPC is initialized.
This field makes it possible for nodes receiving a neighbor discovery
message to detect if multiple neighboring nodes are using the same network
address (i.e. <Z.C.N>), even when the messages are arriving on different
interfaces.

This first phase of node signature support creates the signature,
incorporates it into outgoing neighbor discovery messages, and tracks
the signature used by valid neighbors. An upcoming patch builds on this
foundation to implement the improved duplicate neighbor detection checking.

Signed-off-by: Allan Stephens <allan.stephens@windriver.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>

4 files changed, 21 insertions, 0 deletions

diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index a00e5f81156..7ae1b4c33ae 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -82,6 +82,7 @@ static struct sk_buff *tipc_disc_init_msg(u32 type,
 		msg = buf_msg(buf);
 		tipc_msg_init(msg, LINK_CONFIG, type, INT_H_SIZE, dest_domain);
 		msg_set_non_seq(msg, 1);
+		msg_set_node_sig(msg, tipc_random);
 		msg_set_dest_domain(msg, dest_domain);
 		msg_set_bc_netid(msg, tipc_net_id);
 		b_ptr->media->addr2msg(&b_ptr->addr, msg_media_addr(msg));
@@ -128,6 +129,7 @@ void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
 	u32 orig = msg_prevnode(msg);
 	u32 net_id = msg_bc_netid(msg);
 	u32 type = msg_type(msg);
+	u32 signature = msg_node_sig(msg);
 	int link_fully_up;
 
 	media_addr.broadcast = 1;
@@ -197,6 +199,7 @@ void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
 	}
 
 	/* Accept discovery message & send response, if necessary */
+	n_ptr->signature = signature;
 	link_fully_up = link_working_working(link);
 
 	if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) {
diff --git a/net/tipc/msg.h b/net/tipc/msg.h
index 7b0cda16710..2ec13b73181 100644
--- a/net/tipc/msg.h
+++ b/net/tipc/msg.h
@@ -517,6 +517,16 @@ static inline void msg_set_seq_gap(struct tipc_msg *m, u32 n)
 	msg_set_bits(m, 1, 16, 0x1fff, n);
 }
 
+static inline u32 msg_node_sig(struct tipc_msg *m)
+{
+	return msg_bits(m, 1, 0, 0xffff);
+}
+
+static inline void msg_set_node_sig(struct tipc_msg *m, u32 n)
+{
+	msg_set_bits(m, 1, 0, 0xffff, n);
+}
+
 
 /*
  * Word 2
diff --git a/net/tipc/node.c b/net/tipc/node.c
index 7bc45e135fb..153425997cc 100644
--- a/net/tipc/node.c
+++ b/net/tipc/node.c
@@ -112,6 +112,7 @@ struct tipc_node *tipc_node_create(u32 addr)
 	}
 	list_add_tail(&n_ptr->list, &temp_node->list);
 	n_ptr->block_setup = WAIT_PEER_DOWN;
+	n_ptr->signature = INVALID_NODE_SIG;
 
 	tipc_num_nodes++;
 
diff --git a/net/tipc/node.h b/net/tipc/node.h
index e1b78a2199c..7bf526af1df 100644
--- a/net/tipc/node.h
+++ b/net/tipc/node.h
@@ -42,6 +42,11 @@
 #include "net.h"
 #include "bearer.h"
 
+/*
+ * Out-of-range value for node signature
+ */
+#define INVALID_NODE_SIG 0x10000
+
 /* Flags used to block (re)establishment of contact with a neighboring node */
 
 #define WAIT_PEER_DOWN	0x0001	/* wait to see that peer's links are down */
@@ -61,6 +66,7 @@
  * @block_setup: bit mask of conditions preventing link establishment to node
  * @link_cnt: number of links to node
  * @permit_changeover: non-zero if node has redundant links to this system
+ * @signature: node instance identifier
  * @bclink: broadcast-related info
  *    @supportable: non-zero if node supports TIPC b'cast link capability
  *    @supported: non-zero if node supports TIPC b'cast capability
@@ -86,6 +92,7 @@ struct tipc_node {
 	int working_links;
 	int block_setup;
 	int permit_changeover;
+	u32 signature;
 	struct {
 		u8 supportable;
 		u8 supported;