LXR linux/include/uapi/linux/netfilter_arp/arp

   1/*
   2 *      Format of an ARP firewall descriptor
   3 *
   4 *      src, tgt, src_mask, tgt_mask, arpop, arpop_mask are always stored in
   5 *      network byte order.
   6 *      flags are stored in host byte order (of course).
   7 */
   8
   9#ifndef _UAPI_ARPTABLES_H
  10#define _UAPI_ARPTABLES_H
  11
  12#include <linux/types.h>
  13#include <linux/compiler.h>
  14#include <linux/netfilter_arp.h>
  15
  16#include <linux/netfilter/x_tables.h>
  17
  18#ifndef __KERNEL__
  19#define ARPT_FUNCTION_MAXNAMELEN XT_FUNCTION_MAXNAMELEN
  20#define ARPT_TABLE_MAXNAMELEN XT_TABLE_MAXNAMELEN
  21#define arpt_entry_target xt_entry_target
  22#define arpt_standard_target xt_standard_target
  23#define arpt_error_target xt_error_target
  24#define ARPT_CONTINUE XT_CONTINUE
  25#define ARPT_RETURN XT_RETURN
  26#define arpt_counters_info xt_counters_info
  27#define arpt_counters xt_counters
  28#define ARPT_STANDARD_TARGET XT_STANDARD_TARGET
  29#define ARPT_ERROR_TARGET XT_ERROR_TARGET
  30#define ARPT_ENTRY_ITERATE(entries, size, fn, args...) \
  31        XT_ENTRY_ITERATE(struct arpt_entry, entries, size, fn, ## args)
  32#endif
  33
  34#define ARPT_DEV_ADDR_LEN_MAX 16
  35
  36struct arpt_devaddr_info {
  37        char addr[ARPT_DEV_ADDR_LEN_MAX];
  38        char mask[ARPT_DEV_ADDR_LEN_MAX];
  39};
  40
  41/* Yes, Virginia, you have to zero the padding. */
  42struct arpt_arp {
  43        /* Source and target IP addr */
  44        struct in_addr src, tgt;
  45        /* Mask for src and target IP addr */
  46        struct in_addr smsk, tmsk;
  47
  48        /* Device hw address length, src+target device addresses */
  49        __u8 arhln, arhln_mask;
  50        struct arpt_devaddr_info src_devaddr;
  51        struct arpt_devaddr_info tgt_devaddr;
  52
  53        /* ARP operation code. */
  54        __be16 arpop, arpop_mask;
  55
  56        /* ARP hardware address and protocol address format. */
  57        __be16 arhrd, arhrd_mask;
  58        __be16 arpro, arpro_mask;
  59
  60        /* The protocol address length is only accepted if it is 4
  61         * so there is no use in offering a way to do filtering on it.
  62         */
  63
  64        char iniface[IFNAMSIZ], outiface[IFNAMSIZ];
  65        unsigned char iniface_mask[IFNAMSIZ], outiface_mask[IFNAMSIZ];
  66
  67        /* Flags word */
  68        __u8 flags;
  69        /* Inverse flags */
  70        __u16 invflags;
  71};
  72
  73/* Values for "flag" field in struct arpt_ip (general arp structure).
  74 * No flags defined yet.
  75 */
  76#define ARPT_F_MASK             0x00    /* All possible flag bits mask. */
  77
  78/* Values for "inv" field in struct arpt_arp. */
  79#define ARPT_INV_VIA_IN         0x0001  /* Invert the sense of IN IFACE. */
  80#define ARPT_INV_VIA_OUT        0x0002  /* Invert the sense of OUT IFACE */
  81#define ARPT_INV_SRCIP          0x0004  /* Invert the sense of SRC IP. */
  82#define ARPT_INV_TGTIP          0x0008  /* Invert the sense of TGT IP. */
  83#define ARPT_INV_SRCDEVADDR     0x0010  /* Invert the sense of SRC DEV ADDR. */
  84#define ARPT_INV_TGTDEVADDR     0x0020  /* Invert the sense of TGT DEV ADDR. */
  85#define ARPT_INV_ARPOP          0x0040  /* Invert the sense of ARP OP. */
  86#define ARPT_INV_ARPHRD         0x0080  /* Invert the sense of ARP HRD. */
  87#define ARPT_INV_ARPPRO         0x0100  /* Invert the sense of ARP PRO. */
  88#define ARPT_INV_ARPHLN         0x0200  /* Invert the sense of ARP HLN. */
  89#define ARPT_INV_MASK           0x03FF  /* All possible flag bits mask. */
  90
  91/* This structure defines each of the firewall rules.  Consists of 3
  92   parts which are 1) general ARP header stuff 2) match specific
  93   stuff 3) the target to perform if the rule matches */
  94struct arpt_entry
  95{
  96        struct arpt_arp arp;
  97
  98        /* Size of arpt_entry + matches */
  99        __u16 target_offset;
 100        /* Size of arpt_entry + matches + target */
 101        __u16 next_offset;
 102
 103        /* Back pointer */
 104        unsigned int comefrom;
 105
 106        /* Packet and byte counters. */
 107        struct xt_counters counters;
 108
 109        /* The matches (if any), then the target. */
 110        unsigned char elems[0];
 111};
 112
 113/*
 114 * New IP firewall options for [gs]etsockopt at the RAW IP level.
 115 * Unlike BSD Linux inherits IP options so you don't have to use a raw
 116 * socket for this. Instead we check rights in the calls.
 117 *
 118 * ATTENTION: check linux/in.h before adding new number here.
 119 */
 120#define ARPT_BASE_CTL           96
 121
 122#define ARPT_SO_SET_REPLACE             (ARPT_BASE_CTL)
 123#define ARPT_SO_SET_ADD_COUNTERS        (ARPT_BASE_CTL + 1)
 124#define ARPT_SO_SET_MAX                 ARPT_SO_SET_ADD_COUNTERS
 125
 126#define ARPT_SO_GET_INFO                (ARPT_BASE_CTL)
 127#define ARPT_SO_GET_ENTRIES             (ARPT_BASE_CTL + 1)
 128/* #define ARPT_SO_GET_REVISION_MATCH   (APRT_BASE_CTL + 2) */
 129#define ARPT_SO_GET_REVISION_TARGET     (ARPT_BASE_CTL + 3)
 130#define ARPT_SO_GET_MAX                 (ARPT_SO_GET_REVISION_TARGET)
 131
 132/* The argument to ARPT_SO_GET_INFO */
 133struct arpt_getinfo {
 134        /* Which table: caller fills this in. */
 135        char name[XT_TABLE_MAXNAMELEN];
 136
 137        /* Kernel fills these in. */
 138        /* Which hook entry points are valid: bitmask */
 139        unsigned int valid_hooks;
 140
 141        /* Hook entry points: one per netfilter hook. */
 142        unsigned int hook_entry[NF_ARP_NUMHOOKS];
 143
 144        /* Underflow points. */
 145        unsigned int underflow[NF_ARP_NUMHOOKS];
 146
 147        /* Number of entries */
 148        unsigned int num_entries;
 149
 150        /* Size of entries. */
 151        unsigned int size;
 152};
 153
 154/* The argument to ARPT_SO_SET_REPLACE. */
 155struct arpt_replace {
 156        /* Which table. */
 157        char name[XT_TABLE_MAXNAMELEN];
 158
 159        /* Which hook entry points are valid: bitmask.  You can't
 160           change this. */
 161        unsigned int valid_hooks;
 162
 163        /* Number of entries */
 164        unsigned int num_entries;
 165
 166        /* Total size of new entries */
 167        unsigned int size;
 168
 169        /* Hook entry points. */
 170        unsigned int hook_entry[NF_ARP_NUMHOOKS];
 171
 172        /* Underflow points. */
 173        unsigned int underflow[NF_ARP_NUMHOOKS];
 174
 175        /* Information about old entries: */
 176        /* Number of counters (must be equal to current number of entries). */
 177        unsigned int num_counters;
 178        /* The old entries' counters. */
 179        struct xt_counters __user *counters;
 180
 181        /* The entries (hang off end: not really an array). */
 182        struct arpt_entry entries[0];
 183};
 184
 185/* The argument to ARPT_SO_GET_ENTRIES. */
 186struct arpt_get_entries {
 187        /* Which table: user fills this in. */
 188        char name[XT_TABLE_MAXNAMELEN];
 189
 190        /* User fills this in: total entry size. */
 191        unsigned int size;
 192
 193        /* The entries. */
 194        struct arpt_entry entrytable[0];
 195};
 196
 197/* Helper functions */
 198static __inline__ struct xt_entry_target *arpt_get_target(struct arpt_entry *e)
 199{
 200        return (void *)e + e->target_offset;
 201}
 202
 203/*
 204 *      Main firewall chains definitions and global var's definitions.
 205 */
 206#endif /* _UAPI_ARPTABLES_H */
 207