You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
270 lines
8.1 KiB
270 lines
8.1 KiB
/*- |
|
* 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. 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 |
|
*/ |
|
|
|
/* |
|
* This is libpcap's cut-down version of bpf.h; it includes only |
|
* the stuff needed for the code generator and the userland BPF |
|
* interpreter, and the libpcap APIs for setting filters, etc.. |
|
* |
|
* "pcap-bpf.c" will include the native OS version, as it deals with |
|
* the OS's BPF implementation. |
|
* |
|
* At least two programs found by Google Code Search explicitly includes |
|
* <pcap/bpf.h> (even though <pcap.h>/<pcap/pcap.h> includes it for you), |
|
* so moving that stuff to <pcap/pcap.h> would break the build for some |
|
* programs. |
|
*/ |
|
|
|
/* |
|
* If we've already included <net/bpf.h>, don't re-define this stuff. |
|
* We assume BSD-style multiple-include protection in <net/bpf.h>, |
|
* which is true of all but the oldest versions of FreeBSD and NetBSD, |
|
* or Tru64 UNIX-style multiple-include protection (or, at least, |
|
* Tru64 UNIX 5.x-style; I don't have earlier versions available to check), |
|
* or AIX-style multiple-include protection (or, at least, AIX 5.x-style; |
|
* I don't have earlier versions available to check), or QNX-style |
|
* multiple-include protection (as per GitHub pull request #394). |
|
* |
|
* We do not check for BPF_MAJOR_VERSION, as that's defined by |
|
* <linux/filter.h>, which is directly or indirectly included in some |
|
* programs that also include pcap.h, and <linux/filter.h> doesn't |
|
* define stuff we need. |
|
* |
|
* This also provides our own multiple-include protection. |
|
*/ |
|
#if !defined(_NET_BPF_H_) && !defined(_NET_BPF_H_INCLUDED) && !defined(_BPF_H_) && !defined(_H_BPF) && !defined(lib_pcap_bpf_h) |
|
#define lib_pcap_bpf_h |
|
|
|
#include <pcap/funcattrs.h> |
|
|
|
#ifdef __cplusplus |
|
extern "C" { |
|
#endif |
|
|
|
/* BSD style release date */ |
|
#define BPF_RELEASE 199606 |
|
|
|
#ifdef MSDOS /* must be 32-bit */ |
|
typedef long bpf_int32; |
|
typedef unsigned long bpf_u_int32; |
|
#else |
|
typedef int bpf_int32; |
|
typedef u_int bpf_u_int32; |
|
#endif |
|
|
|
/* |
|
* Alignment macros. BPF_WORDALIGN rounds up to the next |
|
* even multiple of BPF_ALIGNMENT. |
|
* |
|
* Tcpdump's print-pflog.c uses this, so we define it here. |
|
*/ |
|
#ifndef __NetBSD__ |
|
#define BPF_ALIGNMENT sizeof(bpf_int32) |
|
#else |
|
#define BPF_ALIGNMENT sizeof(long) |
|
#endif |
|
#define BPF_WORDALIGN(x) (((x)+(BPF_ALIGNMENT-1))&~(BPF_ALIGNMENT-1)) |
|
|
|
/* |
|
* Structure for "pcap_compile()", "pcap_setfilter()", etc.. |
|
*/ |
|
struct bpf_program { |
|
u_int bf_len; |
|
struct bpf_insn *bf_insns; |
|
}; |
|
|
|
#include <pcap/dlt.h> |
|
|
|
/* |
|
* The instruction encodings. |
|
* |
|
* Please inform tcpdump-workers@lists.tcpdump.org if you use any |
|
* of the reserved values, so that we can note that they're used |
|
* (and perhaps implement it in the reference BPF implementation |
|
* and encourage its implementation elsewhere). |
|
*/ |
|
|
|
/* |
|
* The upper 8 bits of the opcode aren't used. BSD/OS used 0x8000. |
|
*/ |
|
|
|
/* 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 |
|
/* 0x18 reserved; used by BSD/OS */ |
|
#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 |
|
/* 0xc0 reserved; used by BSD/OS */ |
|
/* 0xe0 reserved; used by BSD/OS */ |
|
|
|
/* 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_MOD 0x90 |
|
#define BPF_XOR 0xa0 |
|
/* 0xb0 reserved */ |
|
/* 0xc0 reserved */ |
|
/* 0xd0 reserved */ |
|
/* 0xe0 reserved */ |
|
/* 0xf0 reserved */ |
|
|
|
#define BPF_JA 0x00 |
|
#define BPF_JEQ 0x10 |
|
#define BPF_JGT 0x20 |
|
#define BPF_JGE 0x30 |
|
#define BPF_JSET 0x40 |
|
/* 0x50 reserved; used on BSD/OS */ |
|
/* 0x60 reserved */ |
|
/* 0x70 reserved */ |
|
/* 0x80 reserved */ |
|
/* 0x90 reserved */ |
|
/* 0xa0 reserved */ |
|
/* 0xb0 reserved */ |
|
/* 0xc0 reserved */ |
|
/* 0xd0 reserved */ |
|
/* 0xe0 reserved */ |
|
/* 0xf0 reserved */ |
|
#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 |
|
/* 0x18 reserved */ |
|
|
|
/* misc */ |
|
#define BPF_MISCOP(code) ((code) & 0xf8) |
|
#define BPF_TAX 0x00 |
|
/* 0x08 reserved */ |
|
/* 0x10 reserved */ |
|
/* 0x18 reserved */ |
|
/* #define BPF_COP 0x20 NetBSD "coprocessor" extensions */ |
|
/* 0x28 reserved */ |
|
/* 0x30 reserved */ |
|
/* 0x38 reserved */ |
|
/* #define BPF_COPX 0x40 NetBSD "coprocessor" extensions */ |
|
/* also used on BSD/OS */ |
|
/* 0x48 reserved */ |
|
/* 0x50 reserved */ |
|
/* 0x58 reserved */ |
|
/* 0x60 reserved */ |
|
/* 0x68 reserved */ |
|
/* 0x70 reserved */ |
|
/* 0x78 reserved */ |
|
#define BPF_TXA 0x80 |
|
/* 0x88 reserved */ |
|
/* 0x90 reserved */ |
|
/* 0x98 reserved */ |
|
/* 0xa0 reserved */ |
|
/* 0xa8 reserved */ |
|
/* 0xb0 reserved */ |
|
/* 0xb8 reserved */ |
|
/* 0xc0 reserved; used on BSD/OS */ |
|
/* 0xc8 reserved */ |
|
/* 0xd0 reserved */ |
|
/* 0xd8 reserved */ |
|
/* 0xe0 reserved */ |
|
/* 0xe8 reserved */ |
|
/* 0xf0 reserved */ |
|
/* 0xf8 reserved */ |
|
|
|
/* |
|
* The instruction data structure. |
|
*/ |
|
struct bpf_insn { |
|
u_short code; |
|
u_char jt; |
|
u_char jf; |
|
bpf_u_int32 k; |
|
}; |
|
|
|
/* |
|
* Auxiliary data, for use when interpreting a filter intended for the |
|
* Linux kernel when the kernel rejects the filter (requiring us to |
|
* run it in userland). It contains VLAN tag information. |
|
*/ |
|
struct bpf_aux_data { |
|
u_short vlan_tag_present; |
|
u_short vlan_tag; |
|
}; |
|
|
|
/* |
|
* Macros for insn array initializers. |
|
*/ |
|
#define BPF_STMT(code, k) { (u_short)(code), 0, 0, k } |
|
#define BPF_JUMP(code, k, jt, jf) { (u_short)(code), jt, jf, k } |
|
|
|
PCAP_API int bpf_validate(const struct bpf_insn *, int); |
|
PCAP_API u_int bpf_filter(const struct bpf_insn *, const u_char *, u_int, u_int); |
|
extern u_int bpf_filter_with_aux_data(const struct bpf_insn *, const u_char *, u_int, u_int, const struct bpf_aux_data *); |
|
|
|
/* |
|
* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST). |
|
*/ |
|
#define BPF_MEMWORDS 16 |
|
|
|
#ifdef __cplusplus |
|
} |
|
#endif |
|
|
|
#endif /* !defined(_NET_BPF_H_) && !defined(_BPF_H_) && !defined(_H_BPF) && !defined(lib_pcap_bpf_h) */
|
|
|