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
  23 struct 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
  30 struct 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__ */