4.19-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 508b09046c0f21678652fb66fd1e9959d55591d2 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- net/ipv6/netfilter.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c index 5ae8e1c51079..8b075f0bc351 100644 --- a/net/ipv6/netfilter.c +++ b/net/ipv6/netfilter.c @@ -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,