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Commit 4fd3d7d9 authored by Eric W. Biederman's avatar Eric W. Biederman Committed by David S. Miller
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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: default avatar"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 60395a20

include/net/neighbour.h

+3 −0
Original line number Diff line number Diff line
@@ -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

net/core/neighbour.c

+34 −0
Original line number Diff line number Diff line
@@ -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)