327 lines
11 KiB
C
327 lines
11 KiB
C
/*
|
|
* Copyright (c) 1990, 1991, 1993
|
|
* 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
|
|
* @(#)bpf.h 1.34 (LBL) 6/16/96
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _NET_BPF_H_
|
|
#define _NET_BPF_H_
|
|
|
|
/* BSD style release date */
|
|
#define BPF_RELEASE 199606
|
|
|
|
typedef int32_t 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 0x80000
|
|
#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
|
|
|
|
#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 BIOCGRSIG _IOR('B',114, u_int)
|
|
#define BIOCSRSIG _IOW('B',115, u_int)
|
|
#define BIOCGHDRCMPLT _IOR('B',116, u_int)
|
|
#define BIOCSHDRCMPLT _IOW('B',117, u_int)
|
|
#define BIOCGSEESENT _IOR('B',118, u_int)
|
|
#define BIOCSSEESENT _IOW('B',119, u_int)
|
|
|
|
/*
|
|
* Structure prepended to each packet.
|
|
*/
|
|
struct bpf_hdr {
|
|
struct timeval bh_tstamp; /* time stamp */
|
|
bpf_u_int32 bh_caplen; /* length of captured portion */
|
|
bpf_u_int32 bh_datalen; /* original length of packet */
|
|
u_short 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.
|
|
*/
|
|
#ifdef _KERNEL
|
|
#define SIZEOF_BPF_HDR (sizeof(struct bpf_hdr) <= 20 ? 18 : \
|
|
sizeof(struct bpf_hdr))
|
|
#endif
|
|
|
|
/*
|
|
* 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 */
|
|
|
|
/*
|
|
* These are values from BSD/OS's "bpf.h".
|
|
* These are not the same as the values from the traditional libpcap
|
|
* "bpf.h"; however, these values shouldn't be generated by any
|
|
* OS other than BSD/OS, so the correct values to use here are the
|
|
* BSD/OS values.
|
|
*
|
|
* Platforms that have already assigned these values to other
|
|
* DLT_ codes, however, should give these codes the values
|
|
* from that platform, so that programs that use these codes will
|
|
* continue to compile - even though they won't correctly read
|
|
* files of these types.
|
|
*/
|
|
#define DLT_SLIP_BSDOS 15 /* BSD/OS Serial Line IP */
|
|
#define DLT_PPP_BSDOS 16 /* BSD/OS Point-to-point Protocol */
|
|
|
|
#define DLT_ATM_CLIP 19 /* Linux Classical-IP over ATM */
|
|
|
|
/*
|
|
* This value is defined by NetBSD; other platforms should refrain from
|
|
* using it for other purposes, so that NetBSD savefiles with a link
|
|
* type of 50 can be read as this type on all platforms.
|
|
*/
|
|
#define DLT_PPP_SERIAL 50 /* PPP over serial with HDLC encapsulation */
|
|
|
|
/*
|
|
* This value was defined by libpcap 0.5; platforms that have defined
|
|
* it with a different value should define it here with that value -
|
|
* a link type of 104 in a save file will be mapped to DLT_C_HDLC,
|
|
* whatever value that happens to be, so programs will correctly
|
|
* handle files with that link type regardless of the value of
|
|
* DLT_C_HDLC.
|
|
*
|
|
* The name DLT_C_HDLC was used by BSD/OS; we use that name for source
|
|
* compatibility with programs written for BSD/OS.
|
|
*
|
|
* libpcap 0.5 defined it as DLT_CHDLC; we define DLT_CHDLC as well,
|
|
* for source compatibility with programs written for libpcap 0.5.
|
|
*/
|
|
#define DLT_C_HDLC 104 /* Cisco HDLC */
|
|
#define DLT_CHDLC DLT_C_HDLC
|
|
|
|
/*
|
|
* Reserved for future use.
|
|
* Do not pick other numerical value for these unless you have also
|
|
* picked up the tcpdump.org top-of-CVS-tree version of "savefile.c",
|
|
* which will arrange that capture files for these DLT_ types have
|
|
* the same "network" value on all platforms, regardless of what
|
|
* value is chosen for their DLT_ type (thus allowing captures made
|
|
* on one platform to be read on other platforms, even if the two
|
|
* platforms don't use the same numerical values for all DLT_ types).
|
|
*/
|
|
#define DLT_IEEE802_11 105 /* IEEE 802.11 wireless */
|
|
|
|
/*
|
|
* Values between 106 and 107 are used in capture file headers as
|
|
* link-layer types corresponding to DLT_ types that might differ
|
|
* between platforms; don't use those values for new DLT_ new types.
|
|
*/
|
|
|
|
/*
|
|
* OpenBSD DLT_LOOP, for loopback devices; it's like DLT_NULL, except
|
|
* that the AF_ type in the link-layer header is in network byte order.
|
|
*
|
|
* OpenBSD defines it as 12, but that collides with DLT_RAW, so we
|
|
* define it as 108 here. If OpenBSD picks up this file, it should
|
|
* define DLT_LOOP as 12 in its version, as per the comment above -
|
|
* and should not use 108 for any purpose.
|
|
*/
|
|
#define DLT_LOOP 108
|
|
|
|
/*
|
|
* Values between 109 and 112 are used in capture file headers as
|
|
* link-layer types corresponding to DLT_ types that might differ
|
|
* between platforms; don't use those values for new DLT_ new types.
|
|
*/
|
|
|
|
/*
|
|
* This is for Linux cooked sockets.
|
|
*/
|
|
#define DLT_LINUX_SLL 113
|
|
|
|
/*
|
|
* The instruction encodings.
|
|
*/
|
|
/* 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_short code;
|
|
u_char jt;
|
|
u_char jf;
|
|
bpf_u_int32 k;
|
|
};
|
|
|
|
/*
|
|
* 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 }
|
|
|
|
#ifdef _KERNEL
|
|
int bpf_validate __P((const struct bpf_insn *, int));
|
|
void bpf_tap __P((struct ifnet *, u_char *, u_int));
|
|
void bpf_mtap __P((struct ifnet *, struct mbuf *));
|
|
void bpfattach __P((struct ifnet *, u_int, u_int));
|
|
void bpfdetach __P((struct ifnet *));
|
|
|
|
void bpfilterattach __P((int));
|
|
u_int bpf_filter __P((const struct bpf_insn *, u_char *, u_int, u_int));
|
|
#endif
|
|
|
|
/*
|
|
* Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
|
|
*/
|
|
#define BPF_MEMWORDS 16
|
|
|
|
#endif
|