Subject: Re: [PATCH ipsec-next v3 0/3] xfrm: policy: replace session decode with flow dissector

From: Florian Westphal <[email-masked]>
Date: Thu, 26 Oct 2023 14:57:48 +0200

Antony Antony <[email-masked]> wrote:
> > > Florian Westphal (3):
> > >   xfrm: pass struct net to xfrm_decode_session wrappers
> > >   xfrm: move mark and oif flowi decode into common code
> > >   xfrm: policy: replace session decode with flow dissector
> > 
> > Series applied, thanks a lot Florian!
> > 
> 
> Hi Steffen,
> 
> I would like to report a potential bug that I've encountered while working

s/potential//

Does this patch make things work for you again?  Thanks!

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 6aea8b2f45e0..e8c406eba11b 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -3400,11 +3400,18 @@ decode_session4(const struct xfrm_flow_keys *flkeys, struct flowi *fl, bool reve
 		fl4->fl4_dport = flkeys->ports.dst;
 	}
 
+	switch (flkeys->basic.ip_proto) {
+	case IPPROTO_GRE:
+		fl4->fl4_gre_key = flkeys->gre.keyid;
+		break;
+	case IPPROTO_ICMP:
+		fl4->fl4_icmp_type = flkeys->icmp.type;
+		fl4->fl4_icmp_code = flkeys->icmp.code;
+		break;
+	}
+
 	fl4->flowi4_proto = flkeys->basic.ip_proto;
 	fl4->flowi4_tos = flkeys->ip.tos;
-	fl4->fl4_icmp_type = flkeys->icmp.type;
-	fl4->fl4_icmp_type = flkeys->icmp.code;
-	fl4->fl4_gre_key = flkeys->gre.keyid;
 }
 
 #if IS_ENABLED(CONFIG_IPV6)
@@ -3427,10 +3434,17 @@ decode_session6(const struct xfrm_flow_keys *flkeys, struct flowi *fl, bool reve
 		fl6->fl6_dport = flkeys->ports.dst;
 	}
 
+	switch (flkeys->basic.ip_proto) {
+	case IPPROTO_GRE:
+		fl6->fl6_gre_key = flkeys->gre.keyid;
+		break;
+	case IPPROTO_ICMP:
+		fl6->fl6_icmp_type = flkeys->icmp.type;
+		fl6->fl6_icmp_code = flkeys->icmp.code;
+		break;
+	}
+
 	fl6->flowi6_proto = flkeys->basic.ip_proto;
-	fl6->fl6_icmp_type = flkeys->icmp.type;
-	fl6->fl6_icmp_type = flkeys->icmp.code;
-	fl6->fl6_gre_key = flkeys->gre.keyid;
 }
 #endif