netfilter: ip6t_REJECT: check for IP6T_F_PROTO

Make sure IP6T_F_PROTO is set to enforce layer 4 protocol matching from
the ip6_tables core.

Suggested-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv6/netfilter/ip6t_REJECT.c b/net/ipv6/netfilter/ip6t_REJECT.c
index 544b0a9da1b5..12331efd49cf 100644
--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -83,7 +83,8 @@ static int reject_tg6_check(const struct xt_tgchk_param *par)
                 return -EINVAL;
         } else if (rejinfo->with == IP6T_TCP_RESET) {
                 /* Must specify that it's a TCP packet */
-                if (e->ipv6.proto != IPPROTO_TCP ||
+                if (!(e->ipv6.flags & IP6T_F_PROTO) ||
+                    e->ipv6.proto != IPPROTO_TCP ||
                     (e->ipv6.invflags & XT_INV_PROTO)) {
                         pr_info("TCP_RESET illegal for non-tcp\n");
                         return -EINVAL;