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/*!\file net/bpf.h
* Berkeley Packet Filter.
*/
/*
* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
* The Regents of the University of California. All rights reserved.
*
* This code is derived from the Stanford/CMU enet packet filter,
* (net/enet.c) distributed as part of 4.3BSD, and code contributed
* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
* Berkeley Laboratory.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)bpf.h 8.1 (Berkeley) 6/10/93
* @(#) Header: bpf.h,v 1.36 97/06/12 14:29:53 leres Exp (LBL)
*/
#ifndef __NET_BPF_H
#define __NET_BPF_H
#ifndef __SYS_WTYPES_H
#include <sys/wtypes.h>
#endif
#ifndef __SYS_WTIME_H
#include <sys/wtime.h>
#endif
/* BSD style release date */
#define BPF_RELEASE 199606
typedef long bpf_int32;
typedef u_int32_t bpf_u_int32;
/*
* Alignment macros. BPF_WORDALIGN rounds up to the next
* even multiple of BPF_ALIGNMENT.
*/
#define BPF_ALIGNMENT sizeof(long)
#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1)) & ~(BPF_ALIGNMENT-1))
#define BPF_MAXINSNS 512
#define BPF_MAXBUFSIZE 0x8000
#define BPF_MINBUFSIZE 32
/*
* Structure for BIOCSETF.
*/
struct bpf_program {
u_int bf_len;
struct bpf_insn *bf_insns;
};
/*
* Struct returned by BIOCGSTATS.
*/
struct bpf_stat {
u_int bs_recv; /* number of packets received */
u_int bs_drop; /* number of packets dropped */
};
/*
* Struct return by BIOCVERSION. This represents the version number of
* the filter language described by the instruction encodings below.
* bpf understands a program iff kernel_major == filter_major &&
* kernel_minor >= filter_minor, that is, if the value returned by the
* running kernel has the same major number and a minor number equal
* equal to or less than the filter being downloaded. Otherwise, the
* results are undefined, meaning an error may be returned or packets
* may be accepted haphazardly.
* It has nothing to do with the source code version.
*/
struct bpf_version {
u_short bv_major;
u_short bv_minor;
};
/* Current version number of filter architecture. */
#define BPF_MAJOR_VERSION 1
#define BPF_MINOR_VERSION 1
/*
* BPF ioctls
*
* The first set is for compatibility with Sun's pcc style
* header files. If your using gcc, we assume that you
* have run fixincludes so the latter set should work.
*/
#if (defined(sun) || defined(ibm032)) && !defined(__GNUC__)
# define BIOCGBLEN _IOR(B,102, u_int)
# define BIOCSBLEN _IOWR(B,102, u_int)
# define BIOCSETF _IOW(B,103, struct bpf_program)
# define BIOCFLUSH _IO(B,104)
# define BIOCPROMISC _IO(B,105)
# define BIOCGDLT _IOR(B,106, u_int)
# define BIOCGETIF _IOR(B,107, struct ifreq)
# define BIOCSETIF _IOW(B,108, struct ifreq)
# define BIOCSRTIMEOUT _IOW(B,109, struct timeval)
# define BIOCGRTIMEOUT _IOR(B,110, struct timeval)
# define BIOCGSTATS _IOR(B,111, struct bpf_stat)
# define BIOCIMMEDIATE _IOW(B,112, u_int)
# define BIOCVERSION _IOR(B,113, struct bpf_version)
# define BIOCSTCPF _IOW(B,114, struct bpf_program)
# define BIOCSUDPF _IOW(B,115, struct bpf_program)
#else
# define BIOCGBLEN _IOR('B',102, u_int)
# define BIOCSBLEN _IOWR('B',102, u_int)
# define BIOCSETF _IOW('B',103, struct bpf_program)
# define BIOCFLUSH _IO('B',104)
# define BIOCPROMISC _IO('B',105)
# define BIOCGDLT _IOR('B',106, u_int)
# define BIOCGETIF _IOR('B',107, struct ifreq)
# define BIOCSETIF _IOW('B',108, struct ifreq)
# define BIOCSRTIMEOUT _IOW('B',109, struct timeval)
# define BIOCGRTIMEOUT _IOR('B',110, struct timeval)
# define BIOCGSTATS _IOR('B',111, struct bpf_stat)
# define BIOCIMMEDIATE _IOW('B',112, u_int)
# define BIOCVERSION _IOR('B',113, struct bpf_version)
# define BIOCSTCPF _IOW('B',114, struct bpf_program)
# define BIOCSUDPF _IOW('B',115, struct bpf_program)
#endif
/*
* Structure prepended to each packet.
*/
struct bpf_hdr {
struct timeval bh_tstamp; /* time stamp */
u_int32_t bh_caplen; /* length of captured portion */
u_int32_t bh_datalen; /* original length of packet */
u_int16_t bh_hdrlen; /* length of bpf header (this struct */
}; /* plus alignment padding) */
/*
* Because the structure above is not a multiple of 4 bytes, some compilers
* will insist on inserting padding; hence, sizeof(struct bpf_hdr) won't work.
* Only the kernel needs to know about it; applications use bh_hdrlen.
* XXX To save a few bytes on 32-bit machines, we avoid end-of-struct
* XXX padding by using the size of the header data elements. This is
* XXX fail-safe: on new machines, we just use the 'safe' sizeof.
*/
#define SIZEOF_BPF_HDR sizeof(struct bpf_hdr)
/*
* Data-link level type codes.
*/
#define DLT_NULL 0 /* no link-layer encapsulation */
#define DLT_EN10MB 1 /* Ethernet (10Mb) */
#define DLT_EN3MB 2 /* Experimental Ethernet (3Mb) */
#define DLT_AX25 3 /* Amateur Radio AX.25 */
#define DLT_PRONET 4 /* Proteon ProNET Token Ring */
#define DLT_CHAOS 5 /* Chaos */
#define DLT_IEEE802 6 /* IEEE 802 Networks */
#define DLT_ARCNET 7 /* ARCNET */
#define DLT_SLIP 8 /* Serial Line IP */
#define DLT_PPP 9 /* Point-to-point Protocol */
#define DLT_FDDI 10 /* FDDI */
#define DLT_ATM_RFC1483 11 /* LLC/SNAP encapsulated atm */
#define DLT_RAW 12 /* raw IP */
#define DLT_SLIP_BSDOS 13 /* BSD/OS Serial Line IP */
#define DLT_PPP_BSDOS 14 /* BSD/OS Point-to-point Protocol */
#define DLT_LANE8023 15 /* LANE 802.3(Ethernet) */
#define DLT_CIP 16 /* ATM Classical IP */
/*
* The instruction encondings.
*/
/* 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
/*
* The instruction data structure.
*/
struct bpf_insn {
u_int16_t code;
u_char jt;
u_char jf;
int32_t k;
};
/*
* Macros for insn array initializers.
*/
#define BPF_STMT(code, k) { (u_int16_t)(code), 0, 0, k }
#define BPF_JUMP(code, k, jt, jf) { (u_int16_t)(code), jt, jf, k }
u_int bpf_filter (struct bpf_insn *, u_char *, u_int, u_int);
/*
* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
*/
#define BPF_MEMWORDS 16
#endif