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neigh: Add helper function neigh_xmit

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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>
This commit is contained in:
Eric W. Biederman
2015-03-03 17:11:16 -06:00
committed by David S. Miller
parent 60395a20ff
commit 4fd3d7d9e8
2 changed files with 37 additions and 0 deletions
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34
net/core/neighbour.c
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@@ -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)