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/*
* Mach Operating System
* Copyright (c) 1993 Carnegie Mellon University
* All Rights Reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
* Berkeley Packet Filter Definitions from Berkeley
*/
/*-
* Copyright (c) 1990-1991 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.
* 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 7.1 (Berkeley) 5/7/91
*
*/
#ifndef _DEVICE_BPF_H_
#define _DEVICE_BPF_H_
/*
* Alignment macros. BPF_WORDALIGN rounds up to the next
* even multiple of BPF_ALIGNMENT.
*/
#define BPF_ALIGNMENT sizeof(int)
#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
/*
* 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 {
unsigned short bv_major;
unsigned short bv_minor;
};
/* Current version number. */
#define BPF_MAJOR_VERSION 1
#define BPF_MINOR_VERSION 1
/*
* Data-link level type codes.
* Currently, only DLT_EN10MB and DLT_SLIP are supported.
*/
#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 */
/*
* The instruction encondings.
*/
/* Magic number and flags for the first instruction */
#define BPF_BEGIN NETF_BPF
#define BPF_IN NETF_IN
#define BPF_OUT NETF_OUT
/* 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_CKMATCH_IMM 0x50
#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) & 0x38)
#define BPF_A 0x10
#define BPF_MATCH_IMM 0x18
#define BPF_MATCH_DATA 0x20
/* misc */
#define BPF_MISCOP(code) ((code) & 0xf8)
#define BPF_TAX 0x00
#define BPF_TXA 0x80
#define BPF_KEY 0x10
#define BPF_REG_DATA 0x18
#define BPF_POSTPONE 0x20
/*
* The instruction data structure.
*/
struct bpf_insn {
unsigned short code;
unsigned char jt;
unsigned char jf;
int k;
};
typedef struct bpf_insn *bpf_insn_t;
/*
* largest bpf program size
*/
#define NET_MAX_BPF ((NET_MAX_FILTER*sizeof(filter_t))/sizeof(struct bpf_insn))
/*
* Macros for insn array initializers.
*/
#define BPF_STMT(code, k) { (unsigned short)(code), 0, 0, k }
#define BPF_JUMP(code, k, jt, jf) { (unsigned short)(code), jt, jf, k }
#define BPF_RETMATCH(code, k, nkey) { (unsigned short)(code), nkey, 0, k }
#define BPF_INSN_STMT(pc, c, n) {\
(pc)->code = (c); \
(pc)->jt = (pc)->jf = 0; \
(pc)->k = (n); \
(pc)++; \
}
#define BPF_INSN_JUMP(pc, c, n, jtrue, jfalse) {\
(pc)->code = (c); \
(pc)->jt = (jtrue); \
(pc)->jf = (jfalse); \
(pc)->k = (n); \
(pc)++; \
}
#define BPF_INSN_RETMATCH(pc, c, n, nkey) {\
(pc)->code = (c); \
(pc)->jt = (nkey); \
(pc)->jf = 0; \
(pc)->k = (n); \
(pc)++; \
}
/*
* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
*/
#define BPF_MEMWORDS 16
/*
* Link level header can be accessed by adding BPF_DLBASE to an offset.
*/
#define BPF_DLBASE (1<<30)
#define BPF_BYTES(n) ((n) * sizeof (struct bpf_insn))
#define BPF_BYTES2LEN(n) ((n) / sizeof (struct bpf_insn))
#define BPF_INSN_EQ(p,q) ((p)->code == (q)->code && \
(p)->jt == (q)->jt && \
(p)->jf == (q)->jf && \
(p)->k == (q)->k)
#endif /* _DEVICE_BPF_H_ */
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