fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / net / netfilter / xt_tcpmss.c

diff --git a/net/netfilter/xt_tcpmss.c b/net/netfilter/xt_tcpmss.c
index acf7f53..a3682fe 100644 (file)
--- a/net/netfilter/xt_tcpmss.c
+++ b/net/netfilter/xt_tcpmss.c
@@ -18,21 +18,22 @@
 #include <linux/netfilter_ipv4/ip_tables.h>
 #include <linux/netfilter_ipv6/ip6_tables.h>
 
-#define TH_SYN 0x02
-
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
 MODULE_DESCRIPTION("iptables TCP MSS match module");
 MODULE_ALIAS("ipt_tcpmss");
 
-/* Returns 1 if the mss option is set and matched by the range, 0 otherwise */
-static inline int
-mssoption_match(u_int16_t min, u_int16_t max,
-               const struct sk_buff *skb,
-               unsigned int protoff,
-               int invert,
-               int *hotdrop)
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const struct xt_match *match,
+      const void *matchinfo,
+      int offset,
+      unsigned int protoff,
+      int *hotdrop)
 {
+       const struct xt_tcpmss_match_info *info = matchinfo;
        struct tcphdr _tcph, *th;
        /* tcp.doff is only 4 bits, ie. max 15 * 4 bytes */
        u8 _opt[15 * 4 - sizeof(_tcph)], *op;
@@ -64,109 +65,51 @@ mssoption_match(u_int16_t min, u_int16_t max,
 
                        mssval = (op[i+2] << 8) | op[i+3];
                        
-                       return (mssval >= min && mssval <= max) ^ invert;
+                       return (mssval >= info->mss_min &&
+                               mssval <= info->mss_max) ^ info->invert;
                }
-               if (op[i] < 2) i++;
-               else i += op[i+1]?:1;
+               if (op[i] < 2)
+                       i++;
+               else
+                       i += op[i+1] ? : 1;
        }
 out:
-       return invert;
+       return info->invert;
 
- dropit:
+dropit:
        *hotdrop = 1;
        return 0;
 }
 
-static int
-match(const struct sk_buff *skb,
-      const struct net_device *in,
-      const struct net_device *out,
-      const void *matchinfo,
-      int offset,
-      unsigned int protoff,
-      int *hotdrop)
-{
-       const struct xt_tcpmss_match_info *info = matchinfo;
-
-       return mssoption_match(info->mss_min, info->mss_max, skb, protoff,
-                              info->invert, hotdrop);
-}
-
-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;
-}
-
-static struct xt_match tcpmss_match = {
-       .name           = "tcpmss",
-       .match          = &match,
-       .checkentry     = &checkentry,
-       .me             = THIS_MODULE,
+static struct xt_match xt_tcpmss_match[] = {
+       {
+               .name           = "tcpmss",
+               .family         = AF_INET,
+               .match          = match,
+               .matchsize      = sizeof(struct xt_tcpmss_match_info),
+               .proto          = IPPROTO_TCP,
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "tcpmss",
+               .family         = AF_INET6,
+               .match          = match,
+               .matchsize      = sizeof(struct xt_tcpmss_match_info),
+               .proto          = IPPROTO_TCP,
+               .me             = THIS_MODULE,
+       },
 };
 
-static struct xt_match tcpmss6_match = {
-       .name           = "tcpmss",
-       .match          = &match,
-       .checkentry     = &checkentry6,
-       .me             = THIS_MODULE,
-};
-
-
-static int __init init(void)
+static int __init xt_tcpmss_init(void)
 {
-       int ret;
-       ret = xt_register_match(AF_INET, &tcpmss_match);
-       if (ret)
-               return ret;
-
-       ret = xt_register_match(AF_INET6, &tcpmss6_match);
-       if (ret)
-               xt_unregister_match(AF_INET, &tcpmss_match);
-
-       return ret;
+       return xt_register_matches(xt_tcpmss_match,
+                                  ARRAY_SIZE(xt_tcpmss_match));
 }
 
-static void __exit fini(void)
+static void __exit xt_tcpmss_fini(void)
 {
-       xt_unregister_match(AF_INET6, &tcpmss6_match);
-       xt_unregister_match(AF_INET, &tcpmss_match);
+       xt_unregister_matches(xt_tcpmss_match, ARRAY_SIZE(xt_tcpmss_match));
 }
 
-module_init(init);
-module_exit(fini);
+module_init(xt_tcpmss_init);
+module_exit(xt_tcpmss_fini);