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authorEric W. Biederman <ebiederm@xmission.com>2015-03-03 17:11:16 -0600
committerDavid S. Miller <davem@davemloft.net>2015-03-04 00:23:23 -0500
commit4fd3d7d9e868ffbdb0e7a67c5c8e9dfdcd846a62 (patch)
treea6ee61e3ac7571516b693c2465c6309a59cd0a08 /net/core
parent60395a20ffd74166ea373ea91418d6f98fa7fdfb (diff)
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>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/neighbour.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index fe3c6eac5805..cffaf00561e7 100644
--- 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)