netfilter: use fwmark_reflect in nf_send_reset

Otherwise, RST packets generated by ipt_REJECT always have mark 0 when
the routing is checked later in the same code path.

Fixes: e110861f8609 ("net: add a sysctl to reflect the fwmark on replies")
Cc: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: Pau Espin Pedrol <pau.espin@tessares.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/ipv6/netfilter/nf_reject_ipv6.c b/net/ipv6/netfilter/nf_reject_ipv6.c
index 10090400c72f..eedee5d108d9 100644
--- a/net/ipv6/netfilter/nf_reject_ipv6.c
+++ b/net/ipv6/netfilter/nf_reject_ipv6.c
@@ -157,6 +157,7 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
         fl6.fl6_sport = otcph->dest;
         fl6.fl6_dport = otcph->source;
         fl6.flowi6_oif = l3mdev_master_ifindex(skb_dst(oldskb)->dev);
+        fl6.flowi6_mark = IP6_REPLY_MARK(net, oldskb->mark);
         security_skb_classify_flow(oldskb, flowi6_to_flowi(&fl6));
         dst = ip6_route_output(net, NULL, &fl6);
         if (dst->error) {
@@ -180,6 +181,8 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
 
         skb_dst_set(nskb, dst);
 
+        nskb->mark = fl6.flowi6_mark;
+
         skb_reserve(nskb, hh_len + dst->header_len);
         ip6h = nf_reject_ip6hdr_put(nskb, oldskb, IPPROTO_TCP,
                                     ip6_dst_hoplimit(dst));