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
  27extern struct xt_table *ipt_register_table(struct net *net,
  28                                           const struct xt_table *table,
  29                                           const struct ipt_replace *repl);
  30extern void ipt_unregister_table(struct net *net, struct xt_table *table);
  31
  32/* Standard entry. */
  33struct ipt_standard {
  34        struct ipt_entry entry;
  35        struct xt_standard_target target;
  36};
  37
  38struct ipt_error {
  39        struct ipt_entry entry;
  40        struct xt_error_target target;
  41};
  42
  43#define IPT_ENTRY_INIT(__size)                                                 \
  44{                                                                              \
  45        .target_offset  = sizeof(struct ipt_entry),                            \
  46        .next_offset    = (__size),                                            \
  47}
  48
  49#define IPT_STANDARD_INIT(__verdict)                                           \
  50{                                                                              \
  51        .entry          = IPT_ENTRY_INIT(sizeof(struct ipt_standard)),         \
  52        .target         = XT_TARGET_INIT(XT_STANDARD_TARGET,                   \
  53                                         sizeof(struct xt_standard_target)),   \
  54        .target.verdict = -(__verdict) - 1,                                    \
  55}
  56
  57#define IPT_ERROR_INIT                                                         \
  58{                                                                              \
  59        .entry          = IPT_ENTRY_INIT(sizeof(struct ipt_error)),            \
  60        .target         = XT_TARGET_INIT(XT_ERROR_TARGET,                      \
  61                                         sizeof(struct xt_error_target)),      \
  62        .target.errorname = "ERROR",                                           \
  63}
  64
  65extern void *ipt_alloc_initial_table(const struct xt_table *);
  66extern unsigned int ipt_do_table(struct sk_buff *skb,
  67                                 unsigned int hook,
  68                                 const struct net_device *in,
  69                                 const struct net_device *out,
  70                                 struct xt_table *table);
  71
  72#ifdef CONFIG_COMPAT
  73#include <net/compat.h>
  74
  75struct compat_ipt_entry {
  76        struct ipt_ip ip;
  77        compat_uint_t nfcache;
  78        __u16 target_offset;
  79        __u16 next_offset;
  80        compat_uint_t comefrom;
  81        struct compat_xt_counters counters;
  82        unsigned char elems[0];
  83};
  84
  85/* Helper functions */
  86static inline struct xt_entry_target *
  87compat_ipt_get_target(struct compat_ipt_entry *e)
  88{
  89        return (void *)e + e->target_offset;
  90}
  91
  92#endif /* CONFIG_COMPAT */
  93#endif /* _IPTABLES_H */
  94