LXR linux/include/uapi/linux/netfilter_ipv6/ip6

   1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   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
  16#ifndef _UAPI_IP6_TABLES_H
  17#define _UAPI_IP6_TABLES_H
  18
  19#include <linux/types.h>
  20#include <linux/compiler.h>
  21#include <linux/if.h>
  22#include <linux/netfilter_ipv6.h>
  23
  24#include <linux/netfilter/x_tables.h>
  25
  26#ifndef __KERNEL__
  27#define IP6T_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
  28#define IP6T_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
  29#define ip6t_match xt_match
  30#define ip6t_target xt_target
  31#define ip6t_table xt_table
  32#define ip6t_get_revision xt_get_revision
  33#define ip6t_entry_match xt_entry_match
  34#define ip6t_entry_target xt_entry_target
  35#define ip6t_standard_target xt_standard_target
  36#define ip6t_error_target xt_error_target
  37#define ip6t_counters xt_counters
  38#define IP6T_CONTINUE XT_CONTINUE
  39#define IP6T_RETURN XT_RETURN
  40
  41/* Pre-iptables-1.4.0 */
  42#include <linux/netfilter/xt_tcpudp.h>
  43#define ip6t_tcp xt_tcp
  44#define ip6t_udp xt_udp
  45#define IP6T_TCP_INV_SRCPT      XT_TCP_INV_SRCPT
  46#define IP6T_TCP_INV_DSTPT      XT_TCP_INV_DSTPT
  47#define IP6T_TCP_INV_FLAGS      XT_TCP_INV_FLAGS
  48#define IP6T_TCP_INV_OPTION     XT_TCP_INV_OPTION
  49#define IP6T_TCP_INV_MASK       XT_TCP_INV_MASK
  50#define IP6T_UDP_INV_SRCPT      XT_UDP_INV_SRCPT
  51#define IP6T_UDP_INV_DSTPT      XT_UDP_INV_DSTPT
  52#define IP6T_UDP_INV_MASK       XT_UDP_INV_MASK
  53
  54#define ip6t_counters_info xt_counters_info
  55#define IP6T_STANDARD_TARGET XT_STANDARD_TARGET
  56#define IP6T_ERROR_TARGET XT_ERROR_TARGET
  57#define IP6T_MATCH_ITERATE(e, fn, args...) \
  58        XT_MATCH_ITERATE(struct ip6t_entry, e, fn, ## args)
  59#define IP6T_ENTRY_ITERATE(entries, size, fn, args...) \
  60        XT_ENTRY_ITERATE(struct ip6t_entry, entries, size, fn, ## args)
  61#endif
  62
  63/* Yes, Virginia, you have to zero the padding. */
  64struct ip6t_ip6 {
  65        /* Source and destination IP6 addr */
  66        struct in6_addr src, dst;               
  67        /* Mask for src and dest IP6 addr */
  68        struct in6_addr smsk, dmsk;
  69        char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
  70        unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
  71
  72        /* Upper protocol number
  73         * - The allowed value is 0 (any) or protocol number of last parsable
  74         *   header, which is 50 (ESP), 59 (No Next Header), 135 (MH), or
  75         *   the non IPv6 extension headers.
  76         * - The protocol numbers of IPv6 extension headers except of ESP and
  77         *   MH do not match any packets.
  78         * - You also need to set IP6T_FLAGS_PROTO to "flags" to check protocol.
  79         */
  80        __u16 proto;
  81        /* TOS to match iff flags & IP6T_F_TOS */
  82        __u8 tos;
  83
  84        /* Flags word */
  85        __u8 flags;
  86        /* Inverse flags */
  87        __u8 invflags;
  88};
  89
  90/* Values for "flag" field in struct ip6t_ip6 (general ip6 structure). */
  91#define IP6T_F_PROTO            0x01    /* Set if rule cares about upper 
  92                                           protocols */
  93#define IP6T_F_TOS              0x02    /* Match the TOS. */
  94#define IP6T_F_GOTO             0x04    /* Set if jump is a goto */
  95#define IP6T_F_MASK             0x07    /* All possible flag bits mask. */
  96
  97/* Values for "inv" field in struct ip6t_ip6. */
  98#define IP6T_INV_VIA_IN         0x01    /* Invert the sense of IN IFACE. */
  99#define IP6T_INV_VIA_OUT                0x02    /* Invert the sense of OUT IFACE */
 100#define IP6T_INV_TOS            0x04    /* Invert the sense of TOS. */
 101#define IP6T_INV_SRCIP          0x08    /* Invert the sense of SRC IP. */
 102#define IP6T_INV_DSTIP          0x10    /* Invert the sense of DST OP. */
 103#define IP6T_INV_FRAG           0x20    /* Invert the sense of FRAG. */
 104#define IP6T_INV_PROTO          XT_INV_PROTO
 105#define IP6T_INV_MASK           0x7F    /* All possible flag bits mask. */
 106
 107/* This structure defines each of the firewall rules.  Consists of 3
 108   parts which are 1) general IP header stuff 2) match specific
 109   stuff 3) the target to perform if the rule matches */
 110struct ip6t_entry {
 111        struct ip6t_ip6 ipv6;
 112
 113        /* Mark with fields that we care about. */
 114        unsigned int nfcache;
 115
 116        /* Size of ipt_entry + matches */
 117        __u16 target_offset;
 118        /* Size of ipt_entry + matches + target */
 119        __u16 next_offset;
 120
 121        /* Back pointer */
 122        unsigned int comefrom;
 123
 124        /* Packet and byte counters. */
 125        struct xt_counters counters;
 126
 127        /* The matches (if any), then the target. */
 128        unsigned char elems[0];
 129};
 130
 131/* Standard entry */
 132struct ip6t_standard {
 133        struct ip6t_entry entry;
 134        struct xt_standard_target target;
 135};
 136
 137struct ip6t_error {
 138        struct ip6t_entry entry;
 139        struct xt_error_target target;
 140};
 141
 142#define IP6T_ENTRY_INIT(__size)                                                \
 143{                                                                              \
 144        .target_offset  = sizeof(struct ip6t_entry),                           \
 145        .next_offset    = (__size),                                            \
 146}
 147
 148#define IP6T_STANDARD_INIT(__verdict)                                          \
 149{                                                                              \
 150        .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_standard)),       \
 151        .target         = XT_TARGET_INIT(XT_STANDARD_TARGET,                   \
 152                                         sizeof(struct xt_standard_target)),   \
 153        .target.verdict = -(__verdict) - 1,                                    \
 154}
 155
 156#define IP6T_ERROR_INIT                                                        \
 157{                                                                              \
 158        .entry          = IP6T_ENTRY_INIT(sizeof(struct ip6t_error)),          \
 159        .target         = XT_TARGET_INIT(XT_ERROR_TARGET,                      \
 160                                         sizeof(struct xt_error_target)),      \
 161        .target.errorname = "ERROR",                                           \
 162}
 163
 164/*
 165 * New IP firewall options for [gs]etsockopt at the RAW IP level.
 166 * Unlike BSD Linux inherits IP options so you don't have to use
 167 * a raw socket for this. Instead we check rights in the calls.
 168 *
 169 * ATTENTION: check linux/in6.h before adding new number here.
 170 */
 171#define IP6T_BASE_CTL                   64
 172
 173#define IP6T_SO_SET_REPLACE             (IP6T_BASE_CTL)
 174#define IP6T_SO_SET_ADD_COUNTERS        (IP6T_BASE_CTL + 1)
 175#define IP6T_SO_SET_MAX                 IP6T_SO_SET_ADD_COUNTERS
 176
 177#define IP6T_SO_GET_INFO                (IP6T_BASE_CTL)
 178#define IP6T_SO_GET_ENTRIES             (IP6T_BASE_CTL + 1)
 179#define IP6T_SO_GET_REVISION_MATCH      (IP6T_BASE_CTL + 4)
 180#define IP6T_SO_GET_REVISION_TARGET     (IP6T_BASE_CTL + 5)
 181#define IP6T_SO_GET_MAX                 IP6T_SO_GET_REVISION_TARGET
 182
 183/* obtain original address if REDIRECT'd connection */
 184#define IP6T_SO_ORIGINAL_DST            80
 185
 186/* ICMP matching stuff */
 187struct ip6t_icmp {
 188        __u8 type;                              /* type to match */
 189        __u8 code[2];                           /* range of code */
 190        __u8 invflags;                          /* Inverse flags */
 191};
 192
 193/* Values for "inv" field for struct ipt_icmp. */
 194#define IP6T_ICMP_INV   0x01    /* Invert the sense of type/code test */
 195
 196/* The argument to IP6T_SO_GET_INFO */
 197struct ip6t_getinfo {
 198        /* Which table: caller fills this in. */
 199        char name[XT_TABLE_MAXNAMELEN];
 200
 201        /* Kernel fills these in. */
 202        /* Which hook entry points are valid: bitmask */
 203        unsigned int valid_hooks;
 204
 205        /* Hook entry points: one per netfilter hook. */
 206        unsigned int hook_entry[NF_INET_NUMHOOKS];
 207
 208        /* Underflow points. */
 209        unsigned int underflow[NF_INET_NUMHOOKS];
 210
 211        /* Number of entries */
 212        unsigned int num_entries;
 213
 214        /* Size of entries. */
 215        unsigned int size;
 216};
 217
 218/* The argument to IP6T_SO_SET_REPLACE. */
 219struct ip6t_replace {
 220        /* Which table. */
 221        char name[XT_TABLE_MAXNAMELEN];
 222
 223        /* Which hook entry points are valid: bitmask.  You can't
 224           change this. */
 225        unsigned int valid_hooks;
 226
 227        /* Number of entries */
 228        unsigned int num_entries;
 229
 230        /* Total size of new entries */
 231        unsigned int size;
 232
 233        /* Hook entry points. */
 234        unsigned int hook_entry[NF_INET_NUMHOOKS];
 235
 236        /* Underflow points. */
 237        unsigned int underflow[NF_INET_NUMHOOKS];
 238
 239        /* Information about old entries: */
 240        /* Number of counters (must be equal to current number of entries). */
 241        unsigned int num_counters;
 242        /* The old entries' counters. */
 243        struct xt_counters __user *counters;
 244
 245        /* The entries (hang off end: not really an array). */
 246        struct ip6t_entry entries[0];
 247};
 248
 249/* The argument to IP6T_SO_GET_ENTRIES. */
 250struct ip6t_get_entries {
 251        /* Which table: user fills this in. */
 252        char name[XT_TABLE_MAXNAMELEN];
 253
 254        /* User fills this in: total entry size. */
 255        unsigned int size;
 256
 257        /* The entries. */
 258        struct ip6t_entry entrytable[0];
 259};
 260
 261/* Helper functions */
 262static __inline__ struct xt_entry_target *
 263ip6t_get_target(struct ip6t_entry *e)
 264{
 265        return (void *)e + e->target_offset;
 266}
 267
 268/*
 269 *      Main firewall chains definitions and global var's definitions.
 270 */
 271
 272#endif /* _UAPI_IP6_TABLES_H */
 273