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/*

 * Linux Socket Filter Data Structures

 */

#ifndef __LINUX_FILTER_H__

#define __LINUX_FILTER_H__

#include <linux/types.h>

/*

 * Current version of the filter code architecture.

 */

#define BPF_MAJOR_VERSION 1

#define BPF_MINOR_VERSION 1

/*

 *      Try and keep these values and structures similar to BSD, especially

 *      the BPF code definitions which need to match so you can share filters

 */

struct sock_filter {    /* Filter block */

        __u16   code;   /* Actual filter code */

        __u8    jt;     /* Jump true */

        __u8    jf;     /* Jump false */

        __u32   k;      /* Generic multiuse field */

};

struct sock_fprog {     /* Required for SO_ATTACH_FILTER. */

        unsigned short          len;    /* Number of filter blocks */

        struct sock_filter *filter;

};

/*

 * Instruction classes

 */

#define BPF_CLASS(code) ((code) & 0x07)

#define         BPF_LD          0x00

#define         BPF_LDX         0x01

#define         BPF_ST          0x02

#define         BPF_STX         0x03

#define         BPF_ALU         0x04

#define         BPF_JMP         0x05

#define         BPF_RET         0x06

#define         BPF_MISC        0x07

/* ld/ldx fields */

#define BPF_SIZE(code)  ((code) & 0x18)

#define         BPF_W           0x00

#define         BPF_H           0x08

#define         BPF_B           0x10

#define BPF_MODE(code)  ((code) & 0xe0)

#define         BPF_IMM         0x00

#define         BPF_ABS         0x20

#define         BPF_IND         0x40

#define         BPF_MEM         0x60

#define         BPF_LEN         0x80

#define         BPF_MSH         0xa0

/* alu/jmp fields */

#define BPF_OP(code)    ((code) & 0xf0)

#define         BPF_ADD         0x00

#define         BPF_SUB         0x10

#define         BPF_MUL         0x20

#define         BPF_DIV         0x30

#define         BPF_OR          0x40

#define         BPF_AND         0x50

#define         BPF_LSH         0x60

#define         BPF_RSH         0x70

#define         BPF_NEG         0x80

#define         BPF_MOD         0x90

#define         BPF_XOR         0xa0

#define         BPF_JA          0x00

#define         BPF_JEQ         0x10

#define         BPF_JGT         0x20

#define         BPF_JGE         0x30

#define         BPF_JSET        0x40

#define BPF_SRC(code)   ((code) & 0x08)

#define         BPF_K           0x00

#define         BPF_X           0x08

/* ret - BPF_K and BPF_X also apply */

#define BPF_RVAL(code)  ((code) & 0x18)

#define         BPF_A           0x10

/* misc */

#define BPF_MISCOP(code) ((code) & 0xf8)

#define         BPF_TAX         0x00

#define         BPF_TXA         0x80

#ifndef BPF_MAXINSNS

#define BPF_MAXINSNS 4096

#endif

/*

 * Macros for filter block array initializers.

 */

#ifndef BPF_STMT

#define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }

#endif

#ifndef BPF_JUMP

#define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }

#endif

/*

 * Number of scratch memory words for: BPF_ST and BPF_STX

 */

#define BPF_MEMWORDS 16

/* RATIONALE. Negative offsets are invalid in BPF.

   We use them to reference ancillary data.

   Unlike introduction new instructions, it does not break

   existing compilers/optimizers.

 */

#define SKF_AD_OFF    (-0x1000)

#define SKF_AD_PROTOCOL 0

#define SKF_AD_PKTTYPE  4

#define SKF_AD_IFINDEX  8

#define SKF_AD_NLATTR   12

#define SKF_AD_NLATTR_NEST      16

#define SKF_AD_MARK     20

#define SKF_AD_QUEUE    24

#define SKF_AD_HATYPE   28

#define SKF_AD_RXHASH   32

#define SKF_AD_CPU      36

#define SKF_AD_ALU_XOR_X        40

#define SKF_AD_VLAN_TAG 44

#define SKF_AD_VLAN_TAG_PRESENT 48

#define SKF_AD_PAY_OFFSET       52

#define SKF_AD_MAX      56

#define SKF_NET_OFF   (-0x100000)

#define SKF_LL_OFF    (-0x200000)

#endif /* __LINUX_FILTER_H__ */