271 lines
8.1 KiB
C
271 lines
8.1 KiB
C
/*-
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* Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from the Stanford/CMU enet packet filter,
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* (net/enet.c) distributed as part of 4.3BSD, and code contributed
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* to Berkeley by Steven McCanne and Van Jacobson both of Lawrence
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* Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)bpf.h 7.1 (Berkeley) 5/7/91
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*/
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/*
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* This is libpcap's cut-down version of bpf.h; it includes only
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* the stuff needed for the code generator and the userland BPF
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* interpreter, and the libpcap APIs for setting filters, etc..
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*
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* "pcap-bpf.c" will include the native OS version, as it deals with
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* the OS's BPF implementation.
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*
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* At least two programs found by Google Code Search explicitly includes
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* <pcap/bpf.h> (even though <pcap.h>/<pcap/pcap.h> includes it for you),
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* so moving that stuff to <pcap/pcap.h> would break the build for some
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* programs.
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*/
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/*
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* If we've already included <net/bpf.h>, don't re-define this stuff.
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* We assume BSD-style multiple-include protection in <net/bpf.h>,
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* which is true of all but the oldest versions of FreeBSD and NetBSD,
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* or Tru64 UNIX-style multiple-include protection (or, at least,
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* Tru64 UNIX 5.x-style; I don't have earlier versions available to check),
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* or AIX-style multiple-include protection (or, at least, AIX 5.x-style;
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* I don't have earlier versions available to check), or QNX-style
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* multiple-include protection (as per GitHub pull request #394).
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*
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* We do not check for BPF_MAJOR_VERSION, as that's defined by
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* <linux/filter.h>, which is directly or indirectly included in some
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* programs that also include pcap.h, and <linux/filter.h> doesn't
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* define stuff we need.
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*
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* This also provides our own multiple-include protection.
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*/
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#if !defined(_NET_BPF_H_) && !defined(_NET_BPF_H_INCLUDED) && !defined(_BPF_H_) && !defined(_H_BPF) && !defined(lib_pcap_bpf_h)
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#define lib_pcap_bpf_h
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#include <pcap/funcattrs.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* BSD style release date */
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#define BPF_RELEASE 199606
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#ifdef MSDOS /* must be 32-bit */
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typedef long bpf_int32;
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typedef unsigned long bpf_u_int32;
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#else
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typedef int bpf_int32;
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typedef u_int bpf_u_int32;
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#endif
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/*
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* Alignment macros. BPF_WORDALIGN rounds up to the next
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* even multiple of BPF_ALIGNMENT.
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*
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* Tcpdump's print-pflog.c uses this, so we define it here.
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*/
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#ifndef __NetBSD__
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#define BPF_ALIGNMENT sizeof(bpf_int32)
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#else
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#define BPF_ALIGNMENT sizeof(long)
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#endif
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#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1))
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/*
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* Structure for "pcap_compile()", "pcap_setfilter()", etc..
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*/
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struct bpf_program {
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u_int bf_len;
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struct bpf_insn *bf_insns;
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};
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#include <pcap/dlt.h>
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/*
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* The instruction encodings.
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*
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* Please inform tcpdump-workers@lists.tcpdump.org if you use any
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* of the reserved values, so that we can note that they're used
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* (and perhaps implement it in the reference BPF implementation
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* and encourage its implementation elsewhere).
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*/
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/*
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* The upper 8 bits of the opcode aren't used. BSD/OS used 0x8000.
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*/
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/* instruction classes */
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#define BPF_CLASS(code) ((code) & 0x07)
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#define BPF_LD 0x00
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#define BPF_LDX 0x01
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#define BPF_ST 0x02
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#define BPF_STX 0x03
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#define BPF_ALU 0x04
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#define BPF_JMP 0x05
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#define BPF_RET 0x06
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#define BPF_MISC 0x07
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/* ld/ldx fields */
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#define BPF_SIZE(code) ((code) & 0x18)
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#define BPF_W 0x00
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#define BPF_H 0x08
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#define BPF_B 0x10
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/* 0x18 reserved; used by BSD/OS */
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#define BPF_MODE(code) ((code) & 0xe0)
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#define BPF_IMM 0x00
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#define BPF_ABS 0x20
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#define BPF_IND 0x40
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#define BPF_MEM 0x60
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#define BPF_LEN 0x80
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#define BPF_MSH 0xa0
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/* 0xc0 reserved; used by BSD/OS */
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/* 0xe0 reserved; used by BSD/OS */
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/* alu/jmp fields */
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#define BPF_OP(code) ((code) & 0xf0)
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#define BPF_ADD 0x00
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#define BPF_SUB 0x10
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#define BPF_MUL 0x20
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#define BPF_DIV 0x30
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#define BPF_OR 0x40
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#define BPF_AND 0x50
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#define BPF_LSH 0x60
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#define BPF_RSH 0x70
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#define BPF_NEG 0x80
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#define BPF_MOD 0x90
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#define BPF_XOR 0xa0
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/* 0xb0 reserved */
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/* 0xc0 reserved */
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/* 0xd0 reserved */
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/* 0xe0 reserved */
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/* 0xf0 reserved */
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#define BPF_JA 0x00
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#define BPF_JEQ 0x10
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#define BPF_JGT 0x20
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#define BPF_JGE 0x30
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#define BPF_JSET 0x40
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/* 0x50 reserved; used on BSD/OS */
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/* 0x60 reserved */
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/* 0x70 reserved */
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/* 0x80 reserved */
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/* 0x90 reserved */
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/* 0xa0 reserved */
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/* 0xb0 reserved */
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/* 0xc0 reserved */
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/* 0xd0 reserved */
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/* 0xe0 reserved */
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/* 0xf0 reserved */
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#define BPF_SRC(code) ((code) & 0x08)
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#define BPF_K 0x00
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#define BPF_X 0x08
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/* ret - BPF_K and BPF_X also apply */
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#define BPF_RVAL(code) ((code) & 0x18)
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#define BPF_A 0x10
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/* 0x18 reserved */
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/* misc */
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#define BPF_MISCOP(code) ((code) & 0xf8)
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#define BPF_TAX 0x00
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/* 0x08 reserved */
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/* 0x10 reserved */
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/* 0x18 reserved */
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/* #define BPF_COP 0x20 NetBSD "coprocessor" extensions */
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/* 0x28 reserved */
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/* 0x30 reserved */
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/* 0x38 reserved */
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/* #define BPF_COPX 0x40 NetBSD "coprocessor" extensions */
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/* also used on BSD/OS */
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/* 0x48 reserved */
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/* 0x50 reserved */
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/* 0x58 reserved */
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/* 0x60 reserved */
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/* 0x68 reserved */
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/* 0x70 reserved */
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/* 0x78 reserved */
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#define BPF_TXA 0x80
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/* 0x88 reserved */
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/* 0x90 reserved */
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/* 0x98 reserved */
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/* 0xa0 reserved */
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/* 0xa8 reserved */
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/* 0xb0 reserved */
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/* 0xb8 reserved */
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/* 0xc0 reserved; used on BSD/OS */
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/* 0xc8 reserved */
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/* 0xd0 reserved */
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/* 0xd8 reserved */
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/* 0xe0 reserved */
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/* 0xe8 reserved */
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/* 0xf0 reserved */
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/* 0xf8 reserved */
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/*
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* The instruction data structure.
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*/
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struct bpf_insn {
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u_short code;
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u_char jt;
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u_char jf;
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bpf_u_int32 k;
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};
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/*
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* Auxiliary data, for use when interpreting a filter intended for the
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* Linux kernel when the kernel rejects the filter (requiring us to
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* run it in userland). It contains VLAN tag information.
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*/
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struct bpf_aux_data {
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u_short vlan_tag_present;
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u_short vlan_tag;
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};
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/*
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* Macros for insn array initializers.
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*/
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#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k }
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#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k }
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PCAP_API int bpf_validate(const struct bpf_insn *, int);
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PCAP_API u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int);
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extern u_int bpf_filter_with_aux_data(const struct bpf_insn *, const u_char *, u_int, u_int, const struct bpf_aux_data *);
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/*
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* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
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*/
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#define BPF_MEMWORDS 16
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#ifdef __cplusplus
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}
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#endif
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#endif /* !defined(_NET_BPF_H_) && !defined(_BPF_H_) && !defined(_H_BPF) && !defined(lib_pcap_bpf_h) */
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