netfilter: ip6t_{hbh,dst}: Rejects not-strict mode on rule insertion

The current code ignores rules for internal options in HBH/DST options
header in packet processing if 'Not strict' mode is specified (which is not
implemented). Clearly it is not expected by user.

Kernel should reject HBH/DST rule insertion with 'Not strict' mode
in the first place.

Signed-off-by: Yasuyuki Kozakai <yasuyuki.kozakai@toshiba.co.jp>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/netfilter/ip6t_hbh.c b/net/ipv6/netfilter/ip6t_hbh.c
index 62e39ac..26654b2 100644 (file)
--- a/net/ipv6/netfilter/ip6t_hbh.c
+++ b/net/ipv6/netfilter/ip6t_hbh.c
@@ -97,8 +97,6 @@ hbh_mt6(const struct sk_buff *skb, const struct net_device *in,
        hdrlen -= 2;
        if (!(optinfo->flags & IP6T_OPTS_OPTS)) {
                return ret;
-       } else if (optinfo->flags & IP6T_OPTS_NSTRICT) {
-               pr_debug("Not strict - not implemented");
        } else {
                pr_debug("Strict ");
                pr_debug("#%d ", optinfo->optsnr);
@@ -177,6 +175,12 @@ hbh_mt6_check(const char *tablename, const void *entry,
                pr_debug("ip6t_opts: unknown flags %X\n", optsinfo->invflags);
                return false;
        }
+
+       if (optsinfo->flags & IP6T_OPTS_NSTRICT) {
+               pr_debug("ip6t_opts: Not strict - not implemented");
+               return false;
+       }
+
        return true;
 }