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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - include/linux/filter.h
2 * Linux Socket Filter Data Structures
5 #ifndef __LINUX_FILTER_H__
6 #define __LINUX_FILTER_H__
8 #include <linux/compiler.h>
9 #include <linux/types.h>
12 #include <asm/atomic.h>
16 * Current version of the filter code architecture.
18 #define BPF_MAJOR_VERSION 1
19 #define BPF_MINOR_VERSION 1
22 * Try and keep these values and structures similar to BSD, especially
23 * the BPF code definitions which need to match so you can share filters
26 struct sock_filter
{ /* Filter block */
27 __u16 code
; /* Actual filter code */
28 __u8 jt
; /* Jump true */
29 __u8 jf
; /* Jump false */
30 __u32 k
; /* Generic multiuse field */
33 struct sock_fprog
{ /* Required for SO_ATTACH_FILTER. */
34 unsigned short len
; /* Number of filter blocks */
35 struct sock_filter __user
*filter
;
42 #define BPF_CLASS(code) ((code) & 0x07)
53 #define BPF_SIZE(code) ((code) & 0x18)
57 #define BPF_MODE(code) ((code) & 0xe0)
66 #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_MAX 40
130 #define SKF_NET_OFF (-0x100000)
131 #define SKF_LL_OFF (-0x200000)
141 unsigned int len
; /* Number of filter blocks */
142 unsigned int (*bpf_func
)(const struct sk_buff
*skb
,
143 const struct sock_filter
*filter
);
145 struct sock_filter insns
[0];
148 static inline unsigned int sk_filter_len(const struct sk_filter
*fp
)
150 return fp
->len
* sizeof(struct sock_filter
) + sizeof(*fp
);
153 extern int sk_filter(struct sock
*sk
, struct sk_buff
*skb
);
154 extern unsigned int sk_run_filter(const struct sk_buff
*skb
,
155 const struct sock_filter
*filter
);
156 extern int sk_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
);
157 extern int sk_detach_filter(struct sock
*sk
);
158 extern int sk_chk_filter(struct sock_filter
*filter
, int flen
);
160 #ifdef CONFIG_BPF_JIT
161 extern void bpf_jit_compile(struct sk_filter
*fp
);
162 extern void bpf_jit_free(struct sk_filter
*fp
);
163 #define SK_RUN_FILTER(FILTER, SKB) (*FILTER->bpf_func)(SKB, FILTER->insns)
165 static inline void bpf_jit_compile(struct sk_filter
*fp
)
168 static inline void bpf_jit_free(struct sk_filter
*fp
)
171 #define SK_RUN_FILTER(FILTER, SKB) sk_run_filter(SKB, FILTER->insns)
225 BPF_S_ANC_NLATTR_NEST
,
233 #endif /* __KERNEL__ */
235 #endif /* __LINUX_FILTER_H__ */