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