LXR linux/include/uapi/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
  15#ifndef _UAPI_IPTABLES_H
  16#define _UAPI_IPTABLES_H
  17
  18#include <linux/types.h>
  19#include <linux/compiler.h>
  20#include <linux/netfilter_ipv4.h>
  21
  22#include <linux/netfilter/x_tables.h>
  23
  24#ifndef __KERNEL__
  25#define IPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
  26#define IPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
  27#define ipt_match xt_match
  28#define ipt_target xt_target
  29#define ipt_table xt_table
  30#define ipt_get_revision xt_get_revision
  31#define ipt_entry_match xt_entry_match
  32#define ipt_entry_target xt_entry_target
  33#define ipt_standard_target xt_standard_target
  34#define ipt_error_target xt_error_target
  35#define ipt_counters xt_counters
  36#define IPT_CONTINUE XT_CONTINUE
  37#define IPT_RETURN XT_RETURN
  38
  39/* This group is older than old (iptables < v1.4.0-rc1~89) */
  40#include <linux/netfilter/xt_tcpudp.h>
  41#define ipt_udp xt_udp
  42#define ipt_tcp xt_tcp
  43#define IPT_TCP_INV_SRCPT       XT_TCP_INV_SRCPT
  44#define IPT_TCP_INV_DSTPT       XT_TCP_INV_DSTPT
  45#define IPT_TCP_INV_FLAGS       XT_TCP_INV_FLAGS
  46#define IPT_TCP_INV_OPTION      XT_TCP_INV_OPTION
  47#define IPT_TCP_INV_MASK        XT_TCP_INV_MASK
  48#define IPT_UDP_INV_SRCPT       XT_UDP_INV_SRCPT
  49#define IPT_UDP_INV_DSTPT       XT_UDP_INV_DSTPT
  50#define IPT_UDP_INV_MASK        XT_UDP_INV_MASK
  51
  52/* The argument to IPT_SO_ADD_COUNTERS. */
  53#define ipt_counters_info xt_counters_info
  54/* Standard return verdict, or do jump. */
  55#define IPT_STANDARD_TARGET XT_STANDARD_TARGET
  56/* Error verdict. */
  57#define IPT_ERROR_TARGET XT_ERROR_TARGET
  58
  59/* fn returns 0 to continue iteration */
  60#define IPT_MATCH_ITERATE(e, fn, args...) \
  61        XT_MATCH_ITERATE(struct ipt_entry, e, fn, ## args)
  62
  63/* fn returns 0 to continue iteration */
  64#define IPT_ENTRY_ITERATE(entries, size, fn, args...) \
  65        XT_ENTRY_ITERATE(struct ipt_entry, entries, size, fn, ## args)
  66#endif
  67
  68/* Yes, Virginia, you have to zero the padding. */
  69struct ipt_ip {
  70        /* Source and destination IP addr */
  71        struct in_addr src, dst;
  72        /* Mask for src and dest IP addr */
  73        struct in_addr smsk, dmsk;
  74        char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
  75        unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
  76
  77        /* Protocol, 0 = ANY */
  78        __u16 proto;
  79
  80        /* Flags word */
  81        __u8 flags;
  82        /* Inverse flags */
  83        __u8 invflags;
  84};
  85
  86/* Values for "flag" field in struct ipt_ip (general ip structure). */
  87#define IPT_F_FRAG              0x01    /* Set if rule is a fragment rule */
  88#define IPT_F_GOTO              0x02    /* Set if jump is a goto */
  89#define IPT_F_MASK              0x03    /* All possible flag bits mask. */
  90
  91/* Values for "inv" field in struct ipt_ip. */
  92#define IPT_INV_VIA_IN          0x01    /* Invert the sense of IN IFACE. */
  93#define IPT_INV_VIA_OUT         0x02    /* Invert the sense of OUT IFACE */
  94#define IPT_INV_TOS             0x04    /* Invert the sense of TOS. */
  95#define IPT_INV_SRCIP           0x08    /* Invert the sense of SRC IP. */
  96#define IPT_INV_DSTIP           0x10    /* Invert the sense of DST OP. */
  97#define IPT_INV_FRAG            0x20    /* Invert the sense of FRAG. */
  98#define IPT_INV_PROTO           XT_INV_PROTO
  99#define IPT_INV_MASK            0x7F    /* All possible flag bits mask. */
 100
 101/* This structure defines each of the firewall rules.  Consists of 3
 102   parts which are 1) general IP header stuff 2) match specific
 103   stuff 3) the target to perform if the rule matches */
 104struct ipt_entry {
 105        struct ipt_ip ip;
 106
 107        /* Mark with fields that we care about. */
 108        unsigned int nfcache;
 109
 110        /* Size of ipt_entry + matches */
 111        __u16 target_offset;
 112        /* Size of ipt_entry + matches + target */
 113        __u16 next_offset;
 114
 115        /* Back pointer */
 116        unsigned int comefrom;
 117
 118        /* Packet and byte counters. */
 119        struct xt_counters counters;
 120
 121        /* The matches (if any), then the target. */
 122        unsigned char elems[0];
 123};
 124
 125/*
 126 * New IP firewall options for [gs]etsockopt at the RAW IP level.
 127 * Unlike BSD Linux inherits IP options so you don't have to use a raw
 128 * socket for this. Instead we check rights in the calls.
 129 *
 130 * ATTENTION: check linux/in.h before adding new number here.
 131 */
 132#define IPT_BASE_CTL            64
 133
 134#define IPT_SO_SET_REPLACE      (IPT_BASE_CTL)
 135#define IPT_SO_SET_ADD_COUNTERS (IPT_BASE_CTL + 1)
 136#define IPT_SO_SET_MAX          IPT_SO_SET_ADD_COUNTERS
 137
 138#define IPT_SO_GET_INFO                 (IPT_BASE_CTL)
 139#define IPT_SO_GET_ENTRIES              (IPT_BASE_CTL + 1)
 140#define IPT_SO_GET_REVISION_MATCH       (IPT_BASE_CTL + 2)
 141#define IPT_SO_GET_REVISION_TARGET      (IPT_BASE_CTL + 3)
 142#define IPT_SO_GET_MAX                  IPT_SO_GET_REVISION_TARGET
 143
 144/* ICMP matching stuff */
 145struct ipt_icmp {
 146        __u8 type;                              /* type to match */
 147        __u8 code[2];                           /* range of code */
 148        __u8 invflags;                          /* Inverse flags */
 149};
 150
 151/* Values for "inv" field for struct ipt_icmp. */
 152#define IPT_ICMP_INV    0x01    /* Invert the sense of type/code test */
 153
 154/* The argument to IPT_SO_GET_INFO */
 155struct ipt_getinfo {
 156        /* Which table: caller fills this in. */
 157        char name[XT_TABLE_MAXNAMELEN];
 158
 159        /* Kernel fills these in. */
 160        /* Which hook entry points are valid: bitmask */
 161        unsigned int valid_hooks;
 162
 163        /* Hook entry points: one per netfilter hook. */
 164        unsigned int hook_entry[NF_INET_NUMHOOKS];
 165
 166        /* Underflow points. */
 167        unsigned int underflow[NF_INET_NUMHOOKS];
 168
 169        /* Number of entries */
 170        unsigned int num_entries;
 171
 172        /* Size of entries. */
 173        unsigned int size;
 174};
 175
 176/* The argument to IPT_SO_SET_REPLACE. */
 177struct ipt_replace {
 178        /* Which table. */
 179        char name[XT_TABLE_MAXNAMELEN];
 180
 181        /* Which hook entry points are valid: bitmask.  You can't
 182           change this. */
 183        unsigned int valid_hooks;
 184
 185        /* Number of entries */
 186        unsigned int num_entries;
 187
 188        /* Total size of new entries */
 189        unsigned int size;
 190
 191        /* Hook entry points. */
 192        unsigned int hook_entry[NF_INET_NUMHOOKS];
 193
 194        /* Underflow points. */
 195        unsigned int underflow[NF_INET_NUMHOOKS];
 196
 197        /* Information about old entries: */
 198        /* Number of counters (must be equal to current number of entries). */
 199        unsigned int num_counters;
 200        /* The old entries' counters. */
 201        struct xt_counters __user *counters;
 202
 203        /* The entries (hang off end: not really an array). */
 204        struct ipt_entry entries[0];
 205};
 206
 207/* The argument to IPT_SO_GET_ENTRIES. */
 208struct ipt_get_entries {
 209        /* Which table: user fills this in. */
 210        char name[XT_TABLE_MAXNAMELEN];
 211
 212        /* User fills this in: total entry size. */
 213        unsigned int size;
 214
 215        /* The entries. */
 216        struct ipt_entry entrytable[0];
 217};
 218
 219/* Helper functions */
 220static __inline__ struct xt_entry_target *
 221ipt_get_target(struct ipt_entry *e)
 222{
 223        return (void *)e + e->target_offset;
 224}
 225
 226/*
 227 *      Main firewall chains definitions and global var's definitions.
 228 */
 229#endif /* _UAPI_IPTABLES_H */
 230