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Commit f894cbf8 authored by David S. Miller's avatar David S. Miller
Browse files

net: Add optional SKB arg to dst_ops->neigh_lookup(). 



Causes the handler to use the daddr in the ipv4/ipv6 header when
the route gateway is unspecified (local subnet).

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5110effe

include/net/dst.h

+7 −1
Original line number Diff line number Diff line
@@ -420,7 +420,13 @@ static inline int dst_neigh_output(struct dst_entry *dst, struct neighbour *n, 


static inline struct neighbour *dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)

{

	return dst->ops->neigh_lookup(dst, daddr);

	return dst->ops->neigh_lookup(dst, NULL, daddr);

}



static inline struct neighbour *dst_neigh_lookup_skb(const struct dst_entry *dst,

						     struct sk_buff *skb)

{

	return dst->ops->neigh_lookup(dst, skb, NULL);

}



static inline void dst_link_failure(struct sk_buff *skb)

include/net/dst_ops.h

+3 −1
Original line number Diff line number Diff line
@@ -26,7 +26,9 @@ struct dst_ops { 
	void			(*link_failure)(struct sk_buff *);

	void			(*update_pmtu)(struct dst_entry *dst, u32 mtu);

	int			(*local_out)(struct sk_buff *skb);

	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst, const void *daddr);

	struct neighbour *	(*neigh_lookup)(const struct dst_entry *dst,

						struct sk_buff *skb,

						const void *daddr);



	struct kmem_cache	*kmem_cachep;

net/bridge/br_netfilter.c

+3 −1
Original line number Diff line number Diff line
@@ -120,7 +120,9 @@ static u32 *fake_cow_metrics(struct dst_entry *dst, unsigned long old) 
	return NULL;

}



static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst, const void *daddr)

static struct neighbour *fake_neigh_lookup(const struct dst_entry *dst,

					   struct sk_buff *skb,

					   const void *daddr)

{

	return NULL;

}

net/decnet/dn_route.c

+6 −2
Original line number Diff line number Diff line
@@ -117,7 +117,9 @@ static void dn_dst_destroy(struct dst_entry *); 
static struct dst_entry *dn_dst_negative_advice(struct dst_entry *);

static void dn_dst_link_failure(struct sk_buff *);

static void dn_dst_update_pmtu(struct dst_entry *dst, u32 mtu);

static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, const void *daddr);

static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,

					     struct sk_buff *skb,

					     const void *daddr);

static int dn_route_input(struct sk_buff *);

static void dn_run_flush(unsigned long dummy);
@@ -828,7 +830,9 @@ static unsigned int dn_dst_mtu(const struct dst_entry *dst) 
	return mtu ? : dst->dev->mtu;

}



static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst, const void *daddr)

static struct neighbour *dn_dst_neigh_lookup(const struct dst_entry *dst,

					     struct sk_buff *skb,

					     const void *daddr)

{

	return __neigh_lookup_errno(&dn_neigh_table, daddr, dst->dev);

}

net/ipv4/route.c

+10 −4
Original line number Diff line number Diff line
@@ -188,7 +188,9 @@ static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) 
	return p;

}



static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, const void *daddr);

static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,

					   struct sk_buff *skb,

					   const void *daddr);



static struct dst_ops ipv4_dst_ops = {

	.family =		AF_INET,
@@ -1088,7 +1090,9 @@ static int slow_chain_length(const struct rtable *head) 
	return length >> FRACT_BITS;

}



static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, const void *daddr)

static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst,

					   struct sk_buff *skb,

					   const void *daddr)

{

	struct net_device *dev = dst->dev;

	const __be32 *pkey = daddr;
@@ -1098,6 +1102,8 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, const vo 
	rt = (const struct rtable *) dst;

	if (rt->rt_gateway)

		pkey = (const __be32 *) &rt->rt_gateway;

	else if (skb)

		pkey = &ip_hdr(skb)->daddr;



	n = __ipv4_neigh_lookup(dev, *(__force u32 *)pkey);

	if (n)
@@ -1107,7 +1113,7 @@ static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, const vo 


static int rt_bind_neighbour(struct rtable *rt)

{

	struct neighbour *n = ipv4_neigh_lookup(&rt->dst, &rt->rt_gateway);

	struct neighbour *n = ipv4_neigh_lookup(&rt->dst, NULL, &rt->rt_gateway);

	if (IS_ERR(n))

		return PTR_ERR(n);

	dst_set_neighbour(&rt->dst, n);
@@ -1388,7 +1394,7 @@ static void check_peer_redir(struct dst_entry *dst, struct inet_peer *peer) 


	rt->rt_gateway = peer->redirect_learned.a4;



	n = ipv4_neigh_lookup(&rt->dst, &rt->rt_gateway);

	n = ipv4_neigh_lookup(&rt->dst, NULL, &rt->rt_gateway);

	if (IS_ERR(n)) {

		rt->rt_gateway = orig_gw;

		return;