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git.proxmox.com Git - mirror_ubuntu-jammy-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 */
28 __u16 code
; /* Actual filter code */
29 __u8 jt
; /* Jump true */
30 __u8 jf
; /* Jump false */
31 __u32 k
; /* Generic multiuse field */
34 struct sock_fprog
/* Required for SO_ATTACH_FILTER. */
36 unsigned short len
; /* Number of filter blocks */
37 struct sock_filter __user
*filter
;
44 unsigned int len
; /* Number of filter blocks */
45 struct sock_filter insns
[0];
48 static inline unsigned int sk_filter_len(struct sk_filter
*fp
)
50 return fp
->len
*sizeof(struct sock_filter
) + sizeof(*fp
);
58 #define BPF_CLASS(code) ((code) & 0x07)
69 #define BPF_SIZE(code) ((code) & 0x18)
73 #define BPF_MODE(code) ((code) & 0xe0)
82 #define BPF_OP(code) ((code) & 0xf0)
97 #define BPF_SRC(code) ((code) & 0x08)
101 /* ret - BPF_K and BPF_X also apply */
102 #define BPF_RVAL(code) ((code) & 0x18)
106 #define BPF_MISCOP(code) ((code) & 0xf8)
111 #define BPF_MAXINSNS 4096
115 * Macros for filter block array initializers.
118 #define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
121 #define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
125 * Number of scratch memory words for: BPF_ST and BPF_STX
127 #define BPF_MEMWORDS 16
129 /* RATIONALE. Negative offsets are invalid in BPF.
130 We use them to reference ancillary data.
131 Unlike introduction new instructions, it does not break
132 existing compilers/optimizers.
134 #define SKF_AD_OFF (-0x1000)
135 #define SKF_AD_PROTOCOL 0
136 #define SKF_AD_PKTTYPE 4
137 #define SKF_AD_IFINDEX 8
138 #define SKF_AD_MAX 12
139 #define SKF_NET_OFF (-0x100000)
140 #define SKF_LL_OFF (-0x200000)
146 extern unsigned int sk_run_filter(struct sk_buff
*skb
, struct sock_filter
*filter
, int flen
);
147 extern int sk_attach_filter(struct sock_fprog
*fprog
, struct sock
*sk
);
148 extern int sk_chk_filter(struct sock_filter
*filter
, int flen
);
149 #endif /* __KERNEL__ */
151 #endif /* __LINUX_FILTER_H__ */