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ipv4: ICMP packet inspection for multipath

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ICMP packets are inspected to let them route together with the flow they
belong to, minimizing the chance that a problematic path will affect flows
on other paths, and so that anycast environments can work with ECMP.

Signed-off-by: Peter Nørlund <pch@ordbogen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Peter Nørlund 2015-09-30 10:12:22 +02:00 • committed by David S. Miller
parent 0e884c78ee
commit 79a131592d
3 changed files with 80 additions and 9 deletions
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19
net/ipv4/icmp.c
View file

@ -440,6 +440,22 @@ out_unlock:
icmp_xmit_unlock(sk);
}
#ifdef CONFIG_IP_ROUTE_MULTIPATH
/* Source and destination is swapped. See ip_multipath_icmp_hash */
static int icmp_multipath_hash_skb(const struct sk_buff *skb)
{
const struct iphdr *iph = ip_hdr(skb);
return fib_multipath_hash(iph->daddr, iph->saddr);
}
#else
#define icmp_multipath_hash_skb(skb) (-1)
#endif
static struct rtable *icmp_route_lookup(struct net *net,
struct flowi4 *fl4,
struct sk_buff *skb_in,
@ -464,7 +480,8 @@ static struct rtable *icmp_route_lookup(struct net *net,
fl4->flowi4_oif = l3mdev_master_ifindex(skb_in->dev);
security_skb_classify_flow(skb_in, flowi4_to_flowi(fl4));
rt = __ip_route_output_key(net, fl4);
rt = __ip_route_output_key_hash(net, fl4,
icmp_multipath_hash_skb(skb_in));
if (IS_ERR(rt))
return rt;