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Commit f8a1b43b authored by David Ahern's avatar David Ahern Committed by David S. Miller
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net/ipv6: Create a neigh_lookup for FIB entries 



The router discovery code has a FIB entry and wants to validate the
gateway has a neighbor entry. Refactor the existing dst_neigh_lookup
for IPv6 and create a new function that takes the gateway and device
and returns a neighbor entry. Use the new function in
ndisc_router_discovery to validate the gateway.

Signed-off-by: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 3b6761d1

include/net/ip6_route.h

+3 −0
Original line number Diff line number Diff line
@@ -279,4 +279,7 @@ static inline bool rt6_duplicate_nexthop(struct rt6_info *a, struct rt6_info *b) 
	       !lwtunnel_cmp_encap(a->fib6_nh.nh_lwtstate, b->fib6_nh.nh_lwtstate);

}



struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,

				   struct net_device *dev, struct sk_buff *skb,

				   const void *daddr);

#endif

net/ipv6/ndisc.c

+6 −2
Original line number Diff line number Diff line
@@ -1276,7 +1276,9 @@ static void ndisc_router_discovery(struct sk_buff *skb) 
	rt = rt6_get_dflt_router(net, &ipv6_hdr(skb)->saddr, skb->dev);



	if (rt) {

		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);

		neigh = ip6_neigh_lookup(&rt->fib6_nh.nh_gw,

					 rt->fib6_nh.nh_dev, NULL,

					  &ipv6_hdr(skb)->saddr);

		if (!neigh) {

			ND_PRINTK(0, err,

				  "RA: %s got default router without neighbour\n",
@@ -1304,7 +1306,9 @@ static void ndisc_router_discovery(struct sk_buff *skb) 
			return;

		}



		neigh = dst_neigh_lookup(&rt->dst, &ipv6_hdr(skb)->saddr);

		neigh = ip6_neigh_lookup(&rt->fib6_nh.nh_gw,

					 rt->fib6_nh.nh_dev, NULL,

					  &ipv6_hdr(skb)->saddr);

		if (!neigh) {

			ND_PRINTK(0, err,

				  "RA: %s got default router without neighbour\n",

net/ipv6/route.c

+20 −13
Original line number Diff line number Diff line
@@ -182,12 +182,10 @@ static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev) 
	}

}



static inline const void *choose_neigh_daddr(struct rt6_info *rt,

static inline const void *choose_neigh_daddr(const struct in6_addr *p,

					     struct sk_buff *skb,

					     const void *daddr)

{

	struct in6_addr *p = &rt->rt6i_gateway;



	if (!ipv6_addr_any(p))

		return (const void *) p;

	else if (skb)
@@ -195,18 +193,27 @@ static inline const void *choose_neigh_daddr(struct rt6_info *rt, 
	return daddr;

}



static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,

struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,

				   struct net_device *dev,

				   struct sk_buff *skb,

				   const void *daddr)

{

	struct rt6_info *rt = (struct rt6_info *) dst;

	struct neighbour *n;



	daddr = choose_neigh_daddr(rt, skb, daddr);

	n = __ipv6_neigh_lookup(dst->dev, daddr);

	daddr = choose_neigh_daddr(gw, skb, daddr);

	n = __ipv6_neigh_lookup(dev, daddr);

	if (n)

		return n;

	return neigh_create(&nd_tbl, daddr, dst->dev);

	return neigh_create(&nd_tbl, daddr, dev);

}



static struct neighbour *ip6_dst_neigh_lookup(const struct dst_entry *dst,

					      struct sk_buff *skb,

					      const void *daddr)

{

	const struct rt6_info *rt = container_of(dst, struct rt6_info, dst);



	return ip6_neigh_lookup(&rt->rt6i_gateway, dst->dev, skb, daddr);

}



static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr)
@@ -214,7 +221,7 @@ static void ip6_confirm_neigh(const struct dst_entry *dst, const void *daddr) 
	struct net_device *dev = dst->dev;

	struct rt6_info *rt = (struct rt6_info *)dst;



	daddr = choose_neigh_daddr(rt, NULL, daddr);

	daddr = choose_neigh_daddr(&rt->rt6i_gateway, NULL, daddr);

	if (!daddr)

		return;

	if (dev->flags & (IFF_NOARP | IFF_LOOPBACK))
@@ -239,7 +246,7 @@ static struct dst_ops ip6_dst_ops_template = { 
	.update_pmtu		=	ip6_rt_update_pmtu,

	.redirect		=	rt6_do_redirect,

	.local_out		=	__ip6_local_out,

	.neigh_lookup		=	ip6_neigh_lookup,

	.neigh_lookup		=	ip6_dst_neigh_lookup,

	.confirm_neigh		=	ip6_confirm_neigh,

};
@@ -269,7 +276,7 @@ static struct dst_ops ip6_dst_blackhole_ops = { 
	.update_pmtu		=	ip6_rt_blackhole_update_pmtu,

	.redirect		=	ip6_rt_blackhole_redirect,

	.cow_metrics		=	dst_cow_metrics_generic,

	.neigh_lookup		=	ip6_neigh_lookup,

	.neigh_lookup		=	ip6_dst_neigh_lookup,

};



static const u32 ip6_template_metrics[RTAX_MAX] = {