LXR linux/include/linux/netfilter_ipv6/ip6

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * 25-Jul-1998 Major changes to allow for ip chain table
   4 *
   5 * 3-Jan-2000 Named tables to allow packet selection for different uses.
   6 */
   7
   8/*
   9 *      Format of an IP6 firewall descriptor
  10 *
  11 *      src, dst, src_mask, dst_mask are always stored in network byte order.
  12 *      flags are stored in host byte order (of course).
  13 *      Port numbers are stored in HOST byte order.
  14 */
  15#ifndef _IP6_TABLES_H
  16#define _IP6_TABLES_H
  17
  18#include <linux/if.h>
  19#include <linux/in6.h>
  20#include <linux/ipv6.h>
  21#include <linux/skbuff.h>
  22
  23#include <linux/init.h>
  24#include <uapi/linux/netfilter_ipv6/ip6_tables.h>
  25
  26extern void ip6t_init(void) __init;
  27
  28extern void *ip6t_alloc_initial_table(const struct xt_table *);
  29int ip6t_register_table(struct net *net, const struct xt_table *table,
  30                        const struct ip6t_replace *repl,
  31                        const struct nf_hook_ops *ops, struct xt_table **res);
  32void ip6t_unregister_table(struct net *net, struct xt_table *table,
  33                           const struct nf_hook_ops *ops);
  34extern unsigned int ip6t_do_table(struct sk_buff *skb,
  35                                  const struct nf_hook_state *state,
  36                                  struct xt_table *table);
  37
  38/* Check for an extension */
  39static inline int
  40ip6t_ext_hdr(u8 nexthdr)
  41{       return (nexthdr == IPPROTO_HOPOPTS) ||
  42               (nexthdr == IPPROTO_ROUTING) ||
  43               (nexthdr == IPPROTO_FRAGMENT) ||
  44               (nexthdr == IPPROTO_ESP) ||
  45               (nexthdr == IPPROTO_AH) ||
  46               (nexthdr == IPPROTO_NONE) ||
  47               (nexthdr == IPPROTO_DSTOPTS);
  48}
  49
  50#ifdef CONFIG_COMPAT
  51#include <net/compat.h>
  52
  53struct compat_ip6t_entry {
  54        struct ip6t_ip6 ipv6;
  55        compat_uint_t nfcache;
  56        __u16 target_offset;
  57        __u16 next_offset;
  58        compat_uint_t comefrom;
  59        struct compat_xt_counters counters;
  60        unsigned char elems[0];
  61};
  62
  63static inline struct xt_entry_target *
  64compat_ip6t_get_target(struct compat_ip6t_entry *e)
  65{
  66        return (void *)e + e->target_offset;
  67}
  68
  69#endif /* CONFIG_COMPAT */
  70#endif /* _IP6_TABLES_H */
  71