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>

diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 14e3f01..afb8237 100644 (file)
--- 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

diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index fe3c6ea..cffaf00 100644 (file)
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2391,6 +2391,40 @@ void __neigh_for_each_release(struct neigh_table *tbl,
 }
 EXPORT_SYMBOL(__neigh_for_each_release);
 
+int neigh_xmit(int family, struct net_device *dev,
+              const void *addr, struct sk_buff *skb)
+{
+       int err;
+       if (family == AF_PACKET) {
+               err = dev_hard_header(skb, dev, ntohs(skb->protocol),
+                                     addr, NULL, skb->len);
+               if (err < 0)
+                       goto out_kfree_skb;
+               err = dev_queue_xmit(skb);
+       } else {
+               struct neigh_table *tbl;
+               struct neighbour *neigh;
+
+               err = -ENETDOWN;
+               tbl = neigh_find_table(family);
+               if (!tbl)
+                       goto out;
+               neigh = __neigh_lookup_noref(tbl, addr, dev);
+               if (!neigh)
+                       neigh = __neigh_create(tbl, addr, dev, false);
+               err = PTR_ERR(neigh);
+               if (IS_ERR(neigh))
+                       goto out_kfree_skb;
+               err = neigh->output(neigh, skb);
+       }
+out:
+       return err;
+out_kfree_skb:
+       kfree_skb(skb);
+       goto out;
+}
+EXPORT_SYMBOL(neigh_xmit);
+
 #ifdef CONFIG_PROC_FS
 
 static struct neighbour *neigh_get_first(struct seq_file *seq)