From 09ee9dba9611cd382fd360a99ad1c2fa23bfdca8 Mon Sep 17 00:00:00 2001 From: Tobias Brunner Date: Thu, 21 Dec 2017 17:32:24 +0100 Subject: [PATCH] ipv6: Reinject IPv6 packets if IPsec policy matches after SNAT If SNAT modifies the source address the resulting packet might match an IPsec policy, reinject the packet if that's the case. The exact same thing is already done for IPv4. Signed-off-by: Tobias Brunner Acked-by: Steffen Klassert Signed-off-by: David S. Miller --- net/ipv6/ip6_output.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index ece2781a31b2..bcdb615aed6e 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -138,6 +138,14 @@ static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *s return ret; } +#if defined(CONFIG_NETFILTER) && defined(CONFIG_XFRM) + /* Policy lookup after SNAT yielded a new policy */ + if (skb_dst(skb)->xfrm) { + IPCB(skb)->flags |= IPSKB_REROUTED; + return dst_output(net, sk, skb); + } +#endif + if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) || dst_allfrag(skb_dst(skb)) || (IP6CB(skb)->frag_max_size && skb->len > IP6CB(skb)->frag_max_size))