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bpf.h revision 1.1
      1  1.1  cgd /*-
      2  1.1  cgd  * Copyright (c) 1990 The Regents of the University of California.
      3  1.1  cgd  * All rights reserved.
      4  1.1  cgd  *
      5  1.1  cgd  * This code is derived from the Stanford/CMU enet packet filter,
      6  1.1  cgd  * (net/enet.c) distributed as part of 4.3BSD, and code contributed
      7  1.1  cgd  * to Berkeley by Steven McCanne of Lawrence Berkeley Laboratory.
      8  1.1  cgd  *
      9  1.1  cgd  * Redistribution and use in source and binary forms, with or without
     10  1.1  cgd  * modification, are permitted provided that the following conditions
     11  1.1  cgd  * are met:
     12  1.1  cgd  * 1. Redistributions of source code must retain the above copyright
     13  1.1  cgd  *    notice, this list of conditions and the following disclaimer.
     14  1.1  cgd  * 2. Redistributions in binary form must reproduce the above copyright
     15  1.1  cgd  *    notice, this list of conditions and the following disclaimer in the
     16  1.1  cgd  *    documentation and/or other materials provided with the distribution.
     17  1.1  cgd  * 3. All advertising materials mentioning features or use of this software
     18  1.1  cgd  *    must display the following acknowledgement:
     19  1.1  cgd  *	This product includes software developed by the University of
     20  1.1  cgd  *	California, Berkeley and its contributors.
     21  1.1  cgd  * 4. Neither the name of the University nor the names of its contributors
     22  1.1  cgd  *    may be used to endorse or promote products derived from this software
     23  1.1  cgd  *    without specific prior written permission.
     24  1.1  cgd  *
     25  1.1  cgd  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     26  1.1  cgd  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     27  1.1  cgd  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     28  1.1  cgd  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     29  1.1  cgd  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     30  1.1  cgd  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     31  1.1  cgd  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     32  1.1  cgd  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     33  1.1  cgd  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     34  1.1  cgd  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     35  1.1  cgd  * SUCH DAMAGE.
     36  1.1  cgd  *
     37  1.1  cgd  *	@(#)bpf.h	7.1 (Berkeley) 5/7/91
     38  1.1  cgd  *
     39  1.1  cgd  * @(#) $Header: /tank/opengrok/rsync2/NetBSD/src/sys/net/bpf.h,v 1.1 1993/03/21 09:45:37 cgd Exp $ (LBL)
     40  1.1  cgd  */
     41  1.1  cgd 
     42  1.1  cgd /*
     43  1.1  cgd  * Alignment macros.  BPF_WORDALIGN rounds up to the next
     44  1.1  cgd  * even multiple of BPF_ALIGNMENT.
     45  1.1  cgd  */
     46  1.1  cgd #define BPF_ALIGNMENT sizeof(long)
     47  1.1  cgd #define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
     48  1.1  cgd 
     49  1.1  cgd #define BPF_MAXINSNS 512
     50  1.1  cgd #define BPF_MAXBUFSIZE 0x8000
     51  1.1  cgd 
     52  1.1  cgd /*
     53  1.1  cgd  *  Structure for BIOCSETF.
     54  1.1  cgd  */
     55  1.1  cgd struct bpf_program {
     56  1.1  cgd 	u_int bf_len;
     57  1.1  cgd 	struct bpf_insn *bf_insns;
     58  1.1  cgd };
     59  1.1  cgd 
     60  1.1  cgd /*
     61  1.1  cgd  * Struct returned by BIOCGSTATS.
     62  1.1  cgd  */
     63  1.1  cgd struct bpf_stat {
     64  1.1  cgd 	u_int bs_recv;		/* number of packets received */
     65  1.1  cgd 	u_int bs_drop;		/* number of packets dropped */
     66  1.1  cgd };
     67  1.1  cgd 
     68  1.1  cgd /*
     69  1.1  cgd  * BPF ioctls
     70  1.1  cgd  *
     71  1.1  cgd  * The first set is for compatibility with Sun's pcc style
     72  1.1  cgd  * header files.  If your using gcc, we assume that you
     73  1.1  cgd  * have run fixincludes so the latter set should work.
     74  1.1  cgd  */
     75  1.1  cgd #if defined(sun) && !defined(__GNUC__)
     76  1.1  cgd #define	BIOCGFLEN	_IOR(B,101, u_int)
     77  1.1  cgd #define	BIOCGBLEN	_IOR(B,102, u_int)
     78  1.1  cgd #define	BIOCSETF	_IOW(B,103, struct bpf_program)
     79  1.1  cgd #define	BIOCFLUSH	_IO(B,104)
     80  1.1  cgd #define BIOCPROMISC	_IO(B,105)
     81  1.1  cgd #define	BIOCGDLT	_IOR(B,106, u_int)
     82  1.1  cgd #define BIOCGETIF	_IOR(B,107, struct ifreq)
     83  1.1  cgd #define BIOCSETIF	_IOW(B,108, struct ifreq)
     84  1.1  cgd #define BIOCSRTIMEOUT	_IOW(B,109, struct timeval)
     85  1.1  cgd #define BIOCGRTIMEOUT	_IOR(B,110, struct timeval)
     86  1.1  cgd #define BIOCGSTATS	_IOR(B,111, struct bpf_stat)
     87  1.1  cgd #define BIOCIMMEDIATE	_IOW(B,112, u_int)
     88  1.1  cgd #else
     89  1.1  cgd #define	BIOCGFLEN	_IOR('B',101, u_int)
     90  1.1  cgd #define	BIOCGBLEN	_IOR('B',102, u_int)
     91  1.1  cgd #define	BIOCSETF	_IOW('B',103, struct bpf_program)
     92  1.1  cgd #define	BIOCFLUSH	_IO('B',104)
     93  1.1  cgd #define BIOCPROMISC	_IO('B',105)
     94  1.1  cgd #define	BIOCGDLT	_IOR('B',106, u_int)
     95  1.1  cgd #define BIOCGETIF	_IOR('B',107, struct ifreq)
     96  1.1  cgd #define BIOCSETIF	_IOW('B',108, struct ifreq)
     97  1.1  cgd #define BIOCSRTIMEOUT	_IOW('B',109, struct timeval)
     98  1.1  cgd #define BIOCGRTIMEOUT	_IOR('B',110, struct timeval)
     99  1.1  cgd #define BIOCGSTATS	_IOR('B',111, struct bpf_stat)
    100  1.1  cgd #define BIOCIMMEDIATE	_IOW('B',112, u_int)
    101  1.1  cgd #endif
    102  1.1  cgd 
    103  1.1  cgd /*
    104  1.1  cgd  * Structure prepended to each packet.
    105  1.1  cgd  */
    106  1.1  cgd struct bpf_hdr {
    107  1.1  cgd 	struct timeval	bh_tstamp;	/* time stamp */
    108  1.1  cgd 	u_long		bh_caplen;	/* length of captured portion */
    109  1.1  cgd 	u_long		bh_datalen;	/* original length of packet */
    110  1.1  cgd 	u_short		bh_hdrlen;	/* length of bpf header (this struct
    111  1.1  cgd 					   plus alignment padding) */
    112  1.1  cgd };
    113  1.1  cgd /*
    114  1.1  cgd  * Because the structure above is not a multiple of 4 bytes, some compilers
    115  1.1  cgd  * will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
    116  1.1  cgd  * Only the kernel needs to know about it; applications use bh_hdrlen.
    117  1.1  cgd  */
    118  1.1  cgd #ifdef KERNEL
    119  1.1  cgd #define SIZEOF_BPF_HDR 18
    120  1.1  cgd #endif
    121  1.1  cgd 
    122  1.1  cgd /*
    123  1.1  cgd  * Data-link level type codes.
    124  1.1  cgd  * Currently, only DLT_EN10MB and DLT_SLIP are supported.
    125  1.1  cgd  */
    126  1.1  cgd #define DLT_EN10MB	1	/* Ethernet (10Mb) */
    127  1.1  cgd #define DLT_EN3MB	2	/* Experimental Ethernet (3Mb) */
    128  1.1  cgd #define DLT_AX25	3	/* Amateur Radio AX.25 */
    129  1.1  cgd #define DLT_PRONET	4	/* Proteon ProNET Token Ring */
    130  1.1  cgd #define DLT_CHAOS	5	/* Chaos */
    131  1.1  cgd #define DLT_IEEE802	6	/* IEEE 802 Networks */
    132  1.1  cgd #define DLT_ARCNET	7	/* ARCNET */
    133  1.1  cgd #define DLT_SLIP	8	/* Serial Line IP */
    134  1.1  cgd #define DLT_PPP		9	/* Point-to-point Protocol */
    135  1.1  cgd #define DLT_FDDI	10	/* FDDI */
    136  1.1  cgd 
    137  1.1  cgd /*
    138  1.1  cgd  * The instruction encondings.
    139  1.1  cgd  */
    140  1.1  cgd /* classes <2:0> */
    141  1.1  cgd #define BPF_CLASS(code) ((code) & 0x07)
    142  1.1  cgd #define		BPF_LD		0x00
    143  1.1  cgd #define		BPF_LDX		0x01
    144  1.1  cgd #define		BPF_ST		0x02
    145  1.1  cgd #define		BPF_STX		0x03
    146  1.1  cgd #define		BPF_ALU		0x04
    147  1.1  cgd #define		BPF_JMP		0x05
    148  1.1  cgd #define		BPF_RET		0x06
    149  1.1  cgd #define		BPF_MISC	0x07
    150  1.1  cgd 
    151  1.1  cgd /* ld/ldx fields */
    152  1.1  cgd #define BPF_SIZE(code)	((code) & 0x18)
    153  1.1  cgd #define		BPF_W		0x00
    154  1.1  cgd #define		BPF_H		0x08
    155  1.1  cgd #define		BPF_B		0x10
    156  1.1  cgd #define BPF_MODE(code)	((code) & 0xe0)
    157  1.1  cgd #define		BPF_IMM 	0x00
    158  1.1  cgd #define		BPF_ABS		0x20
    159  1.1  cgd #define		BPF_IND		0x40
    160  1.1  cgd #define		BPF_MEM		0x60
    161  1.1  cgd #define		BPF_LEN		0x80
    162  1.1  cgd #define		BPF_MSH		0xa0
    163  1.1  cgd 
    164  1.1  cgd /* alu/jmp fields */
    165  1.1  cgd #define BPF_OP(code)	((code) & 0xf0)
    166  1.1  cgd #define		BPF_ADD		0x00
    167  1.1  cgd #define		BPF_SUB		0x10
    168  1.1  cgd #define		BPF_MUL		0x20
    169  1.1  cgd #define		BPF_DIV		0x30
    170  1.1  cgd #define		BPF_OR		0x40
    171  1.1  cgd #define		BPF_AND		0x50
    172  1.1  cgd #define		BPF_LSH		0x60
    173  1.1  cgd #define		BPF_RSH		0x70
    174  1.1  cgd #define		BPF_NEG		0x80
    175  1.1  cgd #define		BPF_JA		0x00
    176  1.1  cgd #define		BPF_JEQ		0x10
    177  1.1  cgd #define		BPF_JGT		0x20
    178  1.1  cgd #define		BPF_JGE		0x30
    179  1.1  cgd #define		BPF_JSET	0x40
    180  1.1  cgd #define BPF_SRC(code)	((code) & 0x08)
    181  1.1  cgd #define		BPF_K		0x00
    182  1.1  cgd #define		BPF_X		0x08
    183  1.1  cgd 
    184  1.1  cgd /* ret - BPF_K and BPF_X also apply */
    185  1.1  cgd #define BPF_RVAL(code)	((code) & 0x18)
    186  1.1  cgd #define		BPF_A		0x10
    187  1.1  cgd 
    188  1.1  cgd /* misc */
    189  1.1  cgd #define BPF_MISCOP(code) ((code) & 0xf8)
    190  1.1  cgd #define		BPF_TAX		0x00
    191  1.1  cgd #define		BPF_TXA		0x80
    192  1.1  cgd 
    193  1.1  cgd /*
    194  1.1  cgd  * The instruction data structure.
    195  1.1  cgd  */
    196  1.1  cgd struct bpf_insn {
    197  1.1  cgd 	u_short	code;
    198  1.1  cgd 	u_char 	jt;
    199  1.1  cgd 	u_char 	jf;
    200  1.1  cgd 	long	k;
    201  1.1  cgd };
    202  1.1  cgd 
    203  1.1  cgd /*
    204  1.1  cgd  * Macros for insn array initializers.
    205  1.1  cgd  */
    206  1.1  cgd #define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
    207  1.1  cgd #define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
    208  1.1  cgd 
    209  1.1  cgd #ifdef KERNEL
    210  1.1  cgd extern u_int bpf_filter();
    211  1.1  cgd extern void bpfattach();
    212  1.1  cgd extern void bpf_tap();
    213  1.1  cgd extern void bpf_mtap();
    214  1.1  cgd #endif
    215  1.1  cgd 
    216  1.1  cgd /*
    217  1.1  cgd  * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
    218  1.1  cgd  */
    219  1.1  cgd #define BPF_MEMWORDS 16
    220