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bpf.h

/*-
 * 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       7.1 (Berkeley) 5/7/91
 *
 * @(#) $Header: /CVS/nmap/libpcap-possiblymodified/bpf/net/bpf.h,v 1.3 2003/09/20 09:03:01 fyodor Exp $ (LBL)
 */

#ifndef BPF_MAJOR_VERSION

#ifdef __cplusplus
extern "C" {
#endif

/* BSD style release date */
#define BPF_RELEASE 199606

typedef     int bpf_int32;
typedef     u_int bpf_u_int32;

/*
 * Alignment macros.  BPF_WORDALIGN rounds up to the next 
 * even multiple of BPF_ALIGNMENT. 
 */
#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))

#define BPF_MAXINSNS 512
#define BPF_MAXBUFSIZE 0x8000
#define BPF_MINBUFSIZE 32

/*
 *  Structure for BIOCSETF.
 */
00073 struct bpf_program {
      u_int bf_len;
00075       struct bpf_insn *bf_insns;
};
 
/*
 * Struct returned by BIOCGSTATS.
 */
00081 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.
 */
00149 struct bpf_hdr {
00150       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.
 */
#if defined(KERNEL) || defined(_KERNEL)
#define SIZEOF_BPF_HDR 18
#endif

/*
 * Data-link level type codes.
 */

/*
 * These are the types that are the same on all platforms; on other
 * platforms, a <net/bpf.h> should be supplied that defines the additional
 * DLT_* codes appropriately for that platform (the BSDs, for example,
 * should not just pick up this version of "bpf.h"; they should also define
 * the additional DLT_* codes used by their kernels, as well as the values
 * defined here - and, if the values they use for particular DLT_ types
 * differ from those here, they should use their values, not the ones
 * here).
 */
#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 */

/*
 * These are values from the traditional libpcap "bpf.h".
 * Ports of this to particular platforms should replace these definitions
 * with the ones appropriate to that platform, if the values are
 * different on that platform.
 */
#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.
 */
#ifdef __NetBSD__
#ifndef DLT_SLIP_BSDOS
#define DLT_SLIP_BSDOS  13    /* BSD/OS Serial Line IP */
#define DLT_PPP_BSDOS   14    /* BSD/OS Point-to-point Protocol */
#endif
#else
#define DLT_SLIP_BSDOS  15    /* BSD/OS Serial Line IP */
#define DLT_PPP_BSDOS   16    /* BSD/OS Point-to-point Protocol */
#endif

#define DLT_ATM_CLIP    19    /* Linux Classical-IP over ATM */

/*
 * These values are defined by NetBSD; other platforms should refrain from
 * using them for other purposes, so that NetBSD savefiles with link
 * types of 50 or 51 can be read as this type on all platforms.
 */
#define DLT_PPP_SERIAL  50    /* PPP over serial with HDLC encapsulation */
#define DLT_PPP_ETHER   51    /* PPP over Ethernet */

/*
 * Values between 100 and 103 are used in capture file headers as
 * link-layer types corresponding to DLT_ types that differ
 * between platforms; don't use those values for new DLT_ new types.
 */

/*
 * 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

#define DLT_IEEE802_11  105   /* IEEE 802.11 wireless */

/*
 * 106 is reserved for Linux Classical IP over ATM; it's like DLT_RAW,
 * except when it isn't.  (I.e., sometimes it's just raw IP, and
 * sometimes it isn't.)  We currently handle it as DLT_LINUX_SLL,
 * so that we don't have to worry about the link-layer header.)
 */

/*
 * Reserved for Frame Relay; BSD/OS has a DLT_FR, with a value of 11,
 * but that collides with other values.  DLT_FR and DLT_FRELAY packets
 * start with the Frame Relay header (DLCI, etc.).
 */
#define DLT_FRELAY      107

/*
 * 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 as a DLT_ value.
 */
#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_ types
 * other than the corresponding DLT_ types.
 */

/*
 * This is for Linux cooked sockets.
 */
#define DLT_LINUX_SLL   113

/*
 * Apple LocalTalk hardware.
 */
#define DLT_LTALK 114

/*
 * Acorn Econet.
 */
#define DLT_ECONET      115

/*
 * Reserved for use with OpenBSD ipfilter.
 */
#define DLT_IPFILTER    116

/*
 * Reserved for use in capture-file headers as a link-layer type
 * corresponding to OpenBSD DLT_PFLOG; DLT_PFLOG is 17 in OpenBSD,
 * but that's DLT_LANE8023 in SuSE 6.3, so we can't use 17 for it
 * in capture-file headers.
 */
#define DLT_PFLOG 117

/*
 * Registered for Cisco-internal use.
 */
#define DLT_CISCO_IOS   118

/*
 * Reserved for 802.11 cards using the Prism II chips, with a link-layer
 * header including Prism monitor mode information plus an 802.11
 * header.
 */
#define DLT_PRISM_HEADER      119

/*
 * Reserved for Aironet 802.11 cards, with an Aironet link-layer header
 * (see Doug Ambrisko's FreeBSD patches).
 */
#define DLT_AIRONET_HEADER    120

/*
 * Reserved for Siemens HiPath HDLC.
 */
#define DLT_HHDLC       121

/*
 * Reserved for RFC 2625 IP-over-Fibre Channel, as per a request from
 * Don Lee <donlee@cray.com>.
 *
 * This is not for use with raw Fibre Channel, where the link-layer
 * header starts with a Fibre Channel frame header; it's for IP-over-FC,
 * where the link-layer header starts with an RFC 2625 Network_Header
 * field.
 */
#define DLT_IP_OVER_FC        122

/*
 * Reserved for capturing on Solaris with SunATM.
 */
#define DLT_SUNATM            123   /* Solaris+SunATM */

/*
 * 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.
 */
00416 struct bpf_insn {
      u_short     code;
      u_char      jt;
      u_char      jf;
      bpf_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 }

#if defined(BSD) && (defined(KERNEL) || defined(_KERNEL))
/*
 * Systems based on non-BSD kernels don't have ifnet's (or they don't mean
 * anything if it is in <net/if.h>) and won't work like this.
 */
# if __STDC__
extern void bpf_tap(struct ifnet *, u_char *, u_int);
extern void bpf_mtap(struct ifnet *, struct mbuf *);
extern void bpfattach(struct ifnet *, u_int, u_int);
extern void bpfilterattach(int);
# else
extern void bpf_tap();
extern void bpf_mtap();
extern void bpfattach();
extern void bpfilterattach();
# endif /* __STDC__ */
#endif /* BSD && (_KERNEL || KERNEL) */
#if __STDC__ || defined(__cplusplus)
extern int bpf_validate(struct bpf_insn *, int);
extern u_int bpf_filter(struct bpf_insn *, u_char *, u_int, u_int);
#else
extern int bpf_validate();
extern u_int bpf_filter();
#endif

/*
 * Number of scratch memory words (for BPF_LD|BPF_MEM and BPF_ST).
 */
#define BPF_MEMWORDS 16

#ifdef __cplusplus
}
#endif

#endif

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