The root cause is an ICMPv6 packet hits an untracked connection and inherits a mark from the previous packet to which it is not related, IMO it doesn't make sense to inherit mark for nf_conntrack_untracked.
Signed-off-by: XU Tianwen <evan.xu.tianwen@xxxxxxxxx>
---
net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
index f5a61bc..1be9000 100644
--- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
+++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c
@@ -223,6 +223,9 @@ icmpv6_error(struct net *net, struct nf_conn *tmpl,
if (type >= 0 && type < sizeof(noct_valid_new) &&
noct_valid_new[type]) {
skb->nfct = &nf_ct_untracked_get()->ct_general;
+#ifdef CONFIG_NF_CONNTRACK_MARK
+ ((struct nf_conn *)skb->nfct)->mark = 0;
+#endif
skb->nfctinfo = IP_CT_NEW;
nf_conntrack_get(skb->nfct);
return NF_ACCEPT;
--
2.1.2
--
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