LXR linux/include/uapi/linux/netfilter/x

   1#ifndef _UAPI_X_TABLES_H
   2#define _UAPI_X_TABLES_H
   3#include <linux/kernel.h>
   4#include <linux/types.h>
   5
   6#define XT_FUNCTION_MAXNAMELEN 30
   7#define XT_EXTENSION_MAXNAMELEN 29
   8#define XT_TABLE_MAXNAMELEN 32
   9
  10struct xt_entry_match {
  11        union {
  12                struct {
  13                        __u16 match_size;
  14
  15                        /* Used by userspace */
  16                        char name[XT_EXTENSION_MAXNAMELEN];
  17                        __u8 revision;
  18                } user;
  19                struct {
  20                        __u16 match_size;
  21
  22                        /* Used inside the kernel */
  23                        struct xt_match *match;
  24                } kernel;
  25
  26                /* Total length */
  27                __u16 match_size;
  28        } u;
  29
  30        unsigned char data[0];
  31};
  32
  33struct xt_entry_target {
  34        union {
  35                struct {
  36                        __u16 target_size;
  37
  38                        /* Used by userspace */
  39                        char name[XT_EXTENSION_MAXNAMELEN];
  40                        __u8 revision;
  41                } user;
  42                struct {
  43                        __u16 target_size;
  44
  45                        /* Used inside the kernel */
  46                        struct xt_target *target;
  47                } kernel;
  48
  49                /* Total length */
  50                __u16 target_size;
  51        } u;
  52
  53        unsigned char data[0];
  54};
  55
  56#define XT_TARGET_INIT(__name, __size)                                         \
  57{                                                                              \
  58        .target.u.user = {                                                     \
  59                .target_size    = XT_ALIGN(__size),                            \
  60                .name           = __name,                                      \
  61        },                                                                     \
  62}
  63
  64struct xt_standard_target {
  65        struct xt_entry_target target;
  66        int verdict;
  67};
  68
  69struct xt_error_target {
  70        struct xt_entry_target target;
  71        char errorname[XT_FUNCTION_MAXNAMELEN];
  72};
  73
  74/* The argument to IPT_SO_GET_REVISION_*.  Returns highest revision
  75 * kernel supports, if >= revision. */
  76struct xt_get_revision {
  77        char name[XT_EXTENSION_MAXNAMELEN];
  78        __u8 revision;
  79};
  80
  81/* CONTINUE verdict for targets */
  82#define XT_CONTINUE 0xFFFFFFFF
  83
  84/* For standard target */
  85#define XT_RETURN (-NF_REPEAT - 1)
  86
  87/* this is a dummy structure to find out the alignment requirement for a struct
  88 * containing all the fundamental data types that are used in ipt_entry,
  89 * ip6t_entry and arpt_entry.  This sucks, and it is a hack.  It will be my
  90 * personal pleasure to remove it -HW
  91 */
  92struct _xt_align {
  93        __u8 u8;
  94        __u16 u16;
  95        __u32 u32;
  96        __u64 u64;
  97};
  98
  99#define XT_ALIGN(s) __ALIGN_KERNEL((s), __alignof__(struct _xt_align))
 100
 101/* Standard return verdict, or do jump. */
 102#define XT_STANDARD_TARGET ""
 103/* Error verdict. */
 104#define XT_ERROR_TARGET "ERROR"
 105
 106#define SET_COUNTER(c,b,p) do { (c).bcnt = (b); (c).pcnt = (p); } while(0)
 107#define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0)
 108
 109struct xt_counters {
 110        __u64 pcnt, bcnt;                       /* Packet and byte counters */
 111};
 112
 113/* The argument to IPT_SO_ADD_COUNTERS. */
 114struct xt_counters_info {
 115        /* Which table. */
 116        char name[XT_TABLE_MAXNAMELEN];
 117
 118        unsigned int num_counters;
 119
 120        /* The counters (actually `number' of these). */
 121        struct xt_counters counters[0];
 122};
 123
 124#define XT_INV_PROTO            0x40    /* Invert the sense of PROTO. */
 125
 126#ifndef __KERNEL__
 127/* fn returns 0 to continue iteration */
 128#define XT_MATCH_ITERATE(type, e, fn, args...)                  \
 129({                                                              \
 130        unsigned int __i;                                       \
 131        int __ret = 0;                                          \
 132        struct xt_entry_match *__m;                             \
 133                                                                \
 134        for (__i = sizeof(type);                                \
 135             __i < (e)->target_offset;                          \
 136             __i += __m->u.match_size) {                        \
 137                __m = (void *)e + __i;                          \
 138                                                                \
 139                __ret = fn(__m , ## args);                      \
 140                if (__ret != 0)                                 \
 141                        break;                                  \
 142        }                                                       \
 143        __ret;                                                  \
 144})
 145
 146/* fn returns 0 to continue iteration */
 147#define XT_ENTRY_ITERATE_CONTINUE(type, entries, size, n, fn, args...) \
 148({                                                              \
 149        unsigned int __i, __n;                                  \
 150        int __ret = 0;                                          \
 151        type *__entry;                                          \
 152                                                                \
 153        for (__i = 0, __n = 0; __i < (size);                    \
 154             __i += __entry->next_offset, __n++) {              \
 155                __entry = (void *)(entries) + __i;              \
 156                if (__n < n)                                    \
 157                        continue;                               \
 158                                                                \
 159                __ret = fn(__entry , ## args);                  \
 160                if (__ret != 0)                                 \
 161                        break;                                  \
 162        }                                                       \
 163        __ret;                                                  \
 164})
 165
 166/* fn returns 0 to continue iteration */
 167#define XT_ENTRY_ITERATE(type, entries, size, fn, args...) \
 168        XT_ENTRY_ITERATE_CONTINUE(type, entries, size, 0, fn, args)
 169
 170#endif /* !__KERNEL__ */
 171
 172/* pos is normally a struct ipt_entry/ip6t_entry/etc. */
 173#define xt_entry_foreach(pos, ehead, esize) \
 174        for ((pos) = (typeof(pos))(ehead); \
 175             (pos) < (typeof(pos))((char *)(ehead) + (esize)); \
 176             (pos) = (typeof(pos))((char *)(pos) + (pos)->next_offset))
 177
 178/* can only be xt_entry_match, so no use of typeof here */
 179#define xt_ematch_foreach(pos, entry) \
 180        for ((pos) = (struct xt_entry_match *)entry->elems; \
 181             (pos) < (struct xt_entry_match *)((char *)(entry) + \
 182                     (entry)->target_offset); \
 183             (pos) = (struct xt_entry_match *)((char *)(pos) + \
 184                     (pos)->u.match_size))
 185
 186
 187#endif /* _UAPI_X_TABLES_H */
 188