include/uapi/linux/filter.h

   1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
   2 /*
   3  * Linux Socket Filter Data Structures
   4  */
   5
   6 #ifndef _UAPI__LINUX_FILTER_H__
   7 #define _UAPI__LINUX_FILTER_H__
   8
   9 #include <linux/compiler.h>
  10 #include <linux/types.h>
  11 #include <linux/bpf_common.h>
  12
  13 /*
  14  * Current version of the filter code architecture.
  15  */
  16 #define BPF_MAJOR_VERSION 1
  17 #define BPF_MINOR_VERSION 1
  18
  19 /*
  20  *      Try and keep these values and structures similar to BSD, especially
  21  *      the BPF code definitions which need to match so you can share filters
  22  */
  23
  24 struct sock_filter {    /* Filter block */
  25         __u16   code;   /* Actual filter code */
  26         __u8    jt;     /* Jump true */
  27         __u8    jf;     /* Jump false */
  28         __u32   k;      /* Generic multiuse field */
  29 };
  30
  31 struct sock_fprog {     /* Required for SO_ATTACH_FILTER. */
  32         unsigned short          len;    /* Number of filter blocks */
  33         struct sock_filter __user *filter;
  34 };
  35
  36 /* ret - BPF_K and BPF_X also apply */
  37 #define BPF_RVAL(code)  ((code) & 0x18)
  38 #define         BPF_A           0x10
  39
  40 /* misc */
  41 #define BPF_MISCOP(code) ((code) & 0xf8)
  42 #define         BPF_TAX         0x00
  43 #define         BPF_TXA         0x80
  44
  45 /*
  46  * Macros for filter block array initializers.
  47  */
  48 #ifndef BPF_STMT
  49 #define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
  50 #endif
  51 #ifndef BPF_JUMP
  52 #define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
  53 #endif
  54
  55 /*
  56  * Number of scratch memory words for: BPF_ST and BPF_STX
  57  */
  58 #define BPF_MEMWORDS 16
  59
  60 /* RATIONALE. Negative offsets are invalid in BPF.
  61    We use them to reference ancillary data.
  62    Unlike introduction new instructions, it does not break
  63    existing compilers/optimizers.
  64  */
  65 #define SKF_AD_OFF    (-0x1000)
  66 #define SKF_AD_PROTOCOL 0
  67 #define SKF_AD_PKTTYPE  4
  68 #define SKF_AD_IFINDEX  8
  69 #define SKF_AD_NLATTR   12
  70 #define SKF_AD_NLATTR_NEST      16
  71 #define SKF_AD_MARK     20
  72 #define SKF_AD_QUEUE    24
  73 #define SKF_AD_HATYPE   28
  74 #define SKF_AD_RXHASH   32
  75 #define SKF_AD_CPU      36
  76 #define SKF_AD_ALU_XOR_X        40
  77 #define SKF_AD_VLAN_TAG 44
  78 #define SKF_AD_VLAN_TAG_PRESENT 48
  79 #define SKF_AD_PAY_OFFSET       52
  80 #define SKF_AD_RANDOM   56
  81 #define SKF_AD_VLAN_TPID        60
  82 #define SKF_AD_MAX      64
  83
  84 #define SKF_NET_OFF     (-0x100000)
  85 #define SKF_LL_OFF      (-0x200000)
  86
  87 #define BPF_NET_OFF     SKF_NET_OFF
  88 #define BPF_LL_OFF      SKF_LL_OFF
  89
  90 #endif /* _UAPI__LINUX_FILTER_H__ */