include/linux/netfilter_ipv6/ip6_tables.h

   1 /*
   2  * 25-Jul-1998 Major changes to allow for ip chain table
   3  *
   4  * 3-Jan-2000 Named tables to allow packet selection for different uses.
   5  */
   6
   7 /*
   8  *      Format of an IP6 firewall descriptor
   9  *
  10  *      src, dst, src_mask, dst_mask are always stored in network byte order.
  11  *      flags are stored in host byte order (of course).
  12  *      Port numbers are stored in HOST byte order.
  13  */
  14 #ifndef _IP6_TABLES_H
  15 #define _IP6_TABLES_H
  16
  17 #include <linux/if.h>
  18 #include <linux/in6.h>
  19 #include <linux/ipv6.h>
  20 #include <linux/skbuff.h>
  21
  22 #include <linux/init.h>
  23 #include <uapi/linux/netfilter_ipv6/ip6_tables.h>
  24
  25 extern void ip6t_init(void) __init;
  26
  27 extern void *ip6t_alloc_initial_table(const struct xt_table *);
  28 int ip6t_register_table(struct net *net, const struct xt_table *table,
  29                         const struct ip6t_replace *repl,
  30                         const struct nf_hook_ops *ops, struct xt_table **res);
  31 void ip6t_unregister_table(struct net *net, struct xt_table *table,
  32                            const struct nf_hook_ops *ops);
  33 extern unsigned int ip6t_do_table(struct sk_buff *skb,
  34                                   const struct nf_hook_state *state,
  35                                   struct xt_table *table);
  36
  37 /* Check for an extension */
  38 static inline int
  39 ip6t_ext_hdr(u8 nexthdr)
  40 {       return (nexthdr == IPPROTO_HOPOPTS) ||
  41                (nexthdr == IPPROTO_ROUTING) ||
  42                (nexthdr == IPPROTO_FRAGMENT) ||
  43                (nexthdr == IPPROTO_ESP) ||
  44                (nexthdr == IPPROTO_AH) ||
  45                (nexthdr == IPPROTO_NONE) ||
  46                (nexthdr == IPPROTO_DSTOPTS);
  47 }
  48
  49 #ifdef CONFIG_COMPAT
  50 #include <net/compat.h>
  51
  52 struct compat_ip6t_entry {
  53         struct ip6t_ip6 ipv6;
  54         compat_uint_t nfcache;
  55         __u16 target_offset;
  56         __u16 next_offset;
  57         compat_uint_t comefrom;
  58         struct compat_xt_counters counters;
  59         unsigned char elems[0];
  60 };
  61
  62 static inline struct xt_entry_target *
  63 compat_ip6t_get_target(struct compat_ip6t_entry *e)
  64 {
  65         return (void *)e + e->target_offset;
  66 }
  67
  68 #endif /* CONFIG_COMPAT */
  69 #endif /* _IP6_TABLES_H */