+static int
+checkentry(const char *tablename,
+ const void *ipinfo,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ipt_ip *ip = ipinfo;
+ if (matchsize != XT_ALIGN(sizeof(struct xt_tcpmss_match_info)))
+ return 0;
+
+ /* Must specify -p tcp */
+ if (ip->proto != IPPROTO_TCP || (ip->invflags & IPT_INV_PROTO)) {
+ printk("tcpmss: Only works on TCP packets\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static int
+checkentry6(const char *tablename,
+ const void *ipinfo,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ const struct ip6t_ip6 *ip = ipinfo;
+
+ if (matchsize != XT_ALIGN(sizeof(struct xt_tcpmss_match_info)))
+ return 0;
+
+ /* Must specify -p tcp */
+ if (ip->proto != IPPROTO_TCP || (ip->invflags & XT_INV_PROTO)) {
+ printk("tcpmss: Only works on TCP packets\n");
+ return 0;
+ }
+
+ return 1;
+}
+