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>
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Коммит
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@ -358,6 +358,7 @@ void neigh_for_each(struct neigh_table *tbl,
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void (*cb)(struct neighbour *, void *), void *cookie);
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void __neigh_for_each_release(struct neigh_table *tbl,
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int (*cb)(struct neighbour *));
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int neigh_xmit(int fam, struct net_device *, const void *, struct sk_buff *);
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void pneigh_for_each(struct neigh_table *tbl,
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void (*cb)(struct pneigh_entry *));
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@ -511,4 +512,6 @@ static inline void neigh_ha_snapshot(char *dst, const struct neighbour *n,
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memcpy(dst, n->ha, dev->addr_len);
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} while (read_seqretry(&n->ha_lock, seq));
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}
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#endif
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@ -2391,6 +2391,40 @@ void __neigh_for_each_release(struct neigh_table *tbl,
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}
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EXPORT_SYMBOL(__neigh_for_each_release);
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int neigh_xmit(int family, struct net_device *dev,
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const void *addr, struct sk_buff *skb)
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{
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int err;
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if (family == AF_PACKET) {
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err = dev_hard_header(skb, dev, ntohs(skb->protocol),
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addr, NULL, skb->len);
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if (err < 0)
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goto out_kfree_skb;
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err = dev_queue_xmit(skb);
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} else {
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struct neigh_table *tbl;
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struct neighbour *neigh;
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err = -ENETDOWN;
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tbl = neigh_find_table(family);
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if (!tbl)
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goto out;
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neigh = __neigh_lookup_noref(tbl, addr, dev);
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if (!neigh)
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neigh = __neigh_create(tbl, addr, dev, false);
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err = PTR_ERR(neigh);
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if (IS_ERR(neigh))
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goto out_kfree_skb;
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err = neigh->output(neigh, skb);
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}
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out:
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return err;
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out_kfree_skb:
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kfree_skb(skb);
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goto out;
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}
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EXPORT_SYMBOL(neigh_xmit);
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#ifdef CONFIG_PROC_FS
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static struct neighbour *neigh_get_first(struct seq_file *seq)
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