2 * Linux Socket Filter Data Structures
5 #ifndef _UAPI__LINUX_FILTER_H__
6 #define _UAPI__LINUX_FILTER_H__
8 #include <linux/compiler.h>
9 #include <linux/types.h>
13 * Current version of the filter code architecture.
15 #define BPF_MAJOR_VERSION 1
16 #define BPF_MINOR_VERSION 1
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
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 */
30 struct sock_fprog { /* Required for SO_ATTACH_FILTER. */
31 unsigned short len; /* Number of filter blocks */
32 struct sock_filter __user *filter;
39 #define BPF_CLASS(code) ((code) & 0x07)
50 #define BPF_SIZE(code) ((code) & 0x18)
54 #define BPF_MODE(code) ((code) & 0xe0)
63 #define BPF_OP(code) ((code) & 0xf0)
81 #define BPF_SRC(code) ((code) & 0x08)
85 /* ret - BPF_K and BPF_X also apply */
86 #define BPF_RVAL(code) ((code) & 0x18)
90 #define BPF_MISCOP(code) ((code) & 0xf8)
95 #define BPF_MAXINSNS 4096
99 * Macros for filter block array initializers.
102 #define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
105 #define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
109 * Number of scratch memory words for: BPF_ST and BPF_STX
111 #define BPF_MEMWORDS 16
113 /* RATIONALE. Negative offsets are invalid in BPF.
114 We use them to reference ancillary data.
115 Unlike introduction new instructions, it does not break
116 existing compilers/optimizers.
118 #define SKF_AD_OFF (-0x1000)
119 #define SKF_AD_PROTOCOL 0
120 #define SKF_AD_PKTTYPE 4
121 #define SKF_AD_IFINDEX 8
122 #define SKF_AD_NLATTR 12
123 #define SKF_AD_NLATTR_NEST 16
124 #define SKF_AD_MARK 20
125 #define SKF_AD_QUEUE 24
126 #define SKF_AD_HATYPE 28
127 #define SKF_AD_RXHASH 32
128 #define SKF_AD_CPU 36
129 #define SKF_AD_ALU_XOR_X 40
130 #define SKF_AD_VLAN_TAG 44
131 #define SKF_AD_VLAN_TAG_PRESENT 48
132 #define SKF_AD_PAY_OFFSET 52
133 #define SKF_AD_MAX 56
134 #define SKF_NET_OFF (-0x100000)
135 #define SKF_LL_OFF (-0x200000)
138 #endif /* _UAPI__LINUX_FILTER_H__ */