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netfilter: ipv6: Preserve link scope traffic original oif 

When ip6_route_me_harder is invoked, it resets outgoing interface of:
  - link-local scoped packets sent by neighbor discovery
  - multicast packets sent by MLD host
  - multicast packets send by MLD proxy daemon that sets outgoing
    interface through IPV6_PKTINFO ipi6_ifindex

Link-local and multicast packets must keep their original oif after
ip6_route_me_harder is called.

Signed-off-by: Alin Nastac <alin.nastac@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Alin Nastac 2018-11-21 14:00:30 +01:00 committed by Pablo Neira Ayuso
parent 89259088c1
commit 508b09046c
1 changed files with 2 additions and 1 deletions
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3
net/ipv6/netfilter.c
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@ -24,7 +24,8 @@ int ip6_route_me_harder(struct net *net, struct sk_buff *skb)
unsigned int hh_len;
struct dst_entry *dst;
struct flowi6 fl6 = {
.flowi6_oif = sk ? sk->sk_bound_dev_if : 0,
.flowi6_oif = sk && sk->sk_bound_dev_if ? sk->sk_bound_dev_if :
rt6_need_strict(&iph->daddr) ? skb_dst(skb)->dev->ifindex : 0,
.flowi6_mark = skb->mark,
.flowi6_uid = sock_net_uid(net, sk),
.daddr = iph->daddr,