LXR linux/include/linux/netfilter_ipv4/ip

   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 IP 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 _IPTABLES_H
  15#define _IPTABLES_H
  16
  17#include <linux/if.h>
  18#include <linux/in.h>
  19#include <linux/ip.h>
  20#include <linux/skbuff.h>
  21
  22#include <linux/init.h>
  23#include <uapi/linux/netfilter_ipv4/ip_tables.h>
  24
  25extern void ipt_init(void) __init;
  26
  27int ipt_register_table(struct net *net, const struct xt_table *table,
  28                       const struct ipt_replace *repl,
  29                       const struct nf_hook_ops *ops, struct xt_table **res);
  30void ipt_unregister_table(struct net *net, struct xt_table *table,
  31                          const struct nf_hook_ops *ops);
  32
  33/* Standard entry. */
  34struct ipt_standard {
  35        struct ipt_entry entry;
  36        struct xt_standard_target target;
  37};
  38
  39struct ipt_error {
  40        struct ipt_entry entry;
  41        struct xt_error_target target;
  42};
  43
  44#define IPT_ENTRY_INIT(__size)                                                 \
  45{                                                                              \
  46        .target_offset  = sizeof(struct ipt_entry),                            \
  47        .next_offset    = (__size),                                            \
  48}
  49
  50#define IPT_STANDARD_INIT(__verdict)                                           \
  51{                                                                              \
  52        .entry          = IPT_ENTRY_INIT(sizeof(struct ipt_standard)),         \
  53        .target         = XT_TARGET_INIT(XT_STANDARD_TARGET,                   \
  54                                         sizeof(struct xt_standard_target)),   \
  55        .target.verdict = -(__verdict) - 1,                                    \
  56}
  57
  58#define IPT_ERROR_INIT                                                         \
  59{                                                                              \
  60        .entry          = IPT_ENTRY_INIT(sizeof(struct ipt_error)),            \
  61        .target         = XT_TARGET_INIT(XT_ERROR_TARGET,                      \
  62                                         sizeof(struct xt_error_target)),      \
  63        .target.errorname = "ERROR",                                           \
  64}
  65
  66extern void *ipt_alloc_initial_table(const struct xt_table *);
  67extern unsigned int ipt_do_table(struct sk_buff *skb,
  68                                 const struct nf_hook_state *state,
  69                                 struct xt_table *table);
  70
  71#ifdef CONFIG_COMPAT
  72#include <net/compat.h>
  73
  74struct compat_ipt_entry {
  75        struct ipt_ip ip;
  76        compat_uint_t nfcache;
  77        __u16 target_offset;
  78        __u16 next_offset;
  79        compat_uint_t comefrom;
  80        struct compat_xt_counters counters;
  81        unsigned char elems[0];
  82};
  83
  84/* Helper functions */
  85static inline struct xt_entry_target *
  86compat_ipt_get_target(struct compat_ipt_entry *e)
  87{
  88        return (void *)e + e->target_offset;
  89}
  90
  91#endif /* CONFIG_COMPAT */
  92#endif /* _IPTABLES_H */
  93