4.15-stable review patch. If anyone has any objections, please let me know.
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From: Tobias Brunner tobias@strongswan.org
[ Upstream commit 09ee9dba9611cd382fd360a99ad1c2fa23bfdca8 ]
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 tobias@strongswan.org Acked-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv6/ip6_output.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -138,6 +138,14 @@ static int ip6_finish_output(struct net 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))