neigh: Add helper function neigh_xmit

For MPLS I am building the code so that either the neighbour mac
address can be specified or we can have a next hop in ipv4 or ipv6.

The kind of next hop we have is indicated by the neighbour table
pointer.  A neighbour table pointer of NULL is a link layer address.
A non-NULL neighbour table pointer indicates which neighbour table and
thus which address family the next hop address is in that we need to
look up.

The code either sends a packet directly or looks up the appropriate
neighbour table entry and sends the packet.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 14e3f017966b..afb8237b0a8c 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -358,6 +358,7 @@ void neigh_for_each(struct neigh_table *tbl,
                     void (*cb)(struct neighbour *, void *), void *cookie);
 void __neigh_for_each_release(struct neigh_table *tbl,
                               int (*cb)(struct neighbour *));
+int neigh_xmit(int fam, struct net_device *, const void *, struct sk_buff *);
 void pneigh_for_each(struct neigh_table *tbl,
                      void (*cb)(struct pneigh_entry *));
 
@@ -511,4 +512,6 @@ static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
                 memcpy(dst, n->ha, dev->addr_len);
         } while (read_seqretry(&n->ha_lock, seq));
 }
+
+
 #endif