diff options
author | Roland McGrath <roland@gnu.org> | 2000-02-04 03:21:18 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 2000-02-04 03:21:18 +0000 |
commit | 9fd51e9b0ad33a89a83fdbbb66bd20d85f7893fb (patch) | |
tree | 8845b79f170028cb4380045c50277bbf075b5b7d /pfinet/linux-src/include/linux/filter.h |
Import of Linux 2.2.12 subset (ipv4 stack and related)
Diffstat (limited to 'pfinet/linux-src/include/linux/filter.h')
-rw-r--r-- | pfinet/linux-src/include/linux/filter.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/pfinet/linux-src/include/linux/filter.h b/pfinet/linux-src/include/linux/filter.h new file mode 100644 index 00000000..58ad8b1b --- /dev/null +++ b/pfinet/linux-src/include/linux/filter.h @@ -0,0 +1,140 @@ +/* + * Linux Socket Filter Data Structures + */ + +#ifndef __LINUX_FILTER_H__ +#define __LINUX_FILTER_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; +}; + +#ifdef __KERNEL__ +struct sk_filter +{ + atomic_t refcnt; + unsigned int len; /* Number of filter blocks */ + struct sock_filter insns[0]; +}; + +extern __inline__ unsigned int sk_filter_len(struct sk_filter *fp) +{ + return fp->len*sizeof(struct sock_filter) + sizeof(*fp); +} +#endif + +/* + * 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_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_MAX 12 +#define SKF_NET_OFF (-0x100000) +#define SKF_LL_OFF (-0x200000) + +#ifdef __KERNEL__ +extern int sk_run_filter(struct sk_buff *skb, struct sock_filter *filter, int flen); +extern int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); +#endif /* __KERNEL__ */ + +#endif /* __LINUX_FILTER_H__ */ |