LXR linux/include/uapi/linux/filter.h

   1/*
   2 * Linux Socket Filter Data Structures
   3 */
   4
   5#ifndef _UAPI__LINUX_FILTER_H__
   6#define _UAPI__LINUX_FILTER_H__
   7
   8#include <linux/compiler.h>
   9#include <linux/types.h>
  10#include <linux/bpf_common.h>
  11
  12/*
  13 * Current version of the filter code architecture.
  14 */
  15#define BPF_MAJOR_VERSION 1
  16#define BPF_MINOR_VERSION 1
  17
  18/*
  19 *      Try and keep these values and structures similar to BSD, especially
  20 *      the BPF code definitions which need to match so you can share filters
  21 */
  22 
  23struct sock_filter {    /* Filter block */
  24        __u16   code;   /* Actual filter code */
  25        __u8    jt;     /* Jump true */
  26        __u8    jf;     /* Jump false */
  27        __u32   k;      /* Generic multiuse field */
  28};
  29
  30struct sock_fprog {     /* Required for SO_ATTACH_FILTER. */
  31        unsigned short          len;    /* Number of filter blocks */
  32        struct sock_filter __user *filter;
  33};
  34
  35/* ret - BPF_K and BPF_X also apply */
  36#define BPF_RVAL(code)  ((code) & 0x18)
  37#define         BPF_A           0x10
  38
  39/* misc */
  40#define BPF_MISCOP(code) ((code) & 0xf8)
  41#define         BPF_TAX         0x00
  42#define         BPF_TXA         0x80
  43
  44/*
  45 * Macros for filter block array initializers.
  46 */
  47#ifndef BPF_STMT
  48#define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
  49#endif
  50#ifndef BPF_JUMP
  51#define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
  52#endif
  53
  54/*
  55 * Number of scratch memory words for: BPF_ST and BPF_STX
  56 */
  57#define BPF_MEMWORDS 16
  58
  59/* RATIONALE. Negative offsets are invalid in BPF.
  60   We use them to reference ancillary data.
  61   Unlike introduction new instructions, it does not break
  62   existing compilers/optimizers.
  63 */
  64#define SKF_AD_OFF    (-0x1000)
  65#define SKF_AD_PROTOCOL 0
  66#define SKF_AD_PKTTYPE  4
  67#define SKF_AD_IFINDEX  8
  68#define SKF_AD_NLATTR   12
  69#define SKF_AD_NLATTR_NEST      16
  70#define SKF_AD_MARK     20
  71#define SKF_AD_QUEUE    24
  72#define SKF_AD_HATYPE   28
  73#define SKF_AD_RXHASH   32
  74#define SKF_AD_CPU      36
  75#define SKF_AD_ALU_XOR_X        40
  76#define SKF_AD_VLAN_TAG 44
  77#define SKF_AD_VLAN_TAG_PRESENT 48
  78#define SKF_AD_PAY_OFFSET       52
  79#define SKF_AD_RANDOM   56
  80#define SKF_AD_VLAN_TPID        60
  81#define SKF_AD_MAX      64
  82
  83#define SKF_NET_OFF     (-0x100000)
  84#define SKF_LL_OFF      (-0x200000)
  85
  86#define BPF_NET_OFF     SKF_NET_OFF
  87#define BPF_LL_OFF      SKF_LL_OFF
  88
  89#endif /* _UAPI__LINUX_FILTER_H__ */
  90