/*-
 * 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: /usr/cvsroot/wpdpack/Include/NET/bpf.h,v 1.10 2003/04/04 11:15:08 degioanni 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.
 */
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

/*
 * 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.
 */
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.
 */
#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, with BSD-style header */
#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.)
 */

/*
 * 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 Q.922 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

/*
 * This is for RFC 2625 IP-over-Fibre Channel.
 *
 * 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

/*
 * This is for Full Frontal ATM on Solaris with SunATM, with a
 * pseudo-header followed by an AALn PDU.
 *
 * There may be other forms of Full Frontal ATM on other OSes,
 * with different pseudo-headers.
 *
 * If ATM software returns a pseudo-header with VPI/VCI information
 * (and, ideally, packet type information, e.g. signalling, ILMI,
 * LANE, LLC-multiplexed traffic, etc.), it should not use
 * DLT_ATM_RFC1483, but should get a new DLT_ value, so tcpdump
 * and the like don't have to infer the presence or absence of a
 * pseudo-header and the form of the pseudo-header.
 */
#define DLT_SUNATM 123	/* Solaris+SunATM */

/* 
 * Reserved as per request from Kent Dahlgren <kent@praesum.com>
 * for private use.
 */
#define DLT_RIO     124     /* RapidIO */
#define DLT_PCI_EXP 125     /* PCI Express */
#define DLT_AURORA  126     /* Xilinx Aurora link layer */

/*
 * For future use with 802.11 captures - defined by AbsoluteValue
 * Systems to store a number of bits of link-layer information:
 *
 *	http://www.shaftnet.org/~pizza/software/capturefrm.txt
 *
 * but could and arguably should also be used by non-AVS Linux
 * 802.11 drivers and BSD drivers; that may happen in the future.
 */
#define DLT_IEEE802_11_RADIO 127	/* 802.11 plus WLAN header */

/*
 * Reserved for the TZSP encapsulation, as per request from
 * Chris Waters <chris.waters@networkchemistry.com>
 * TZSP is a generic encapsulation for any other link type,
 * which includes a means to include meta-information
 * with the packet, e.g. signal strength and channel
 * for 802.11 packets.
 */
#define DLT_TZSP 128     /* Tazmen Sniffer Protocol */

/*
 * BSD's ARCNET headers have the source host, destination host,
 * and type at the beginning of the packet; that's what's handed
 * up to userland via BPF.
 *
 * Linux's ARCNET headers, however, have a 2-byte offset field
 * between the host IDs and the type; that's what's handed up
 * to userland via PF_PACKET sockets.
 *
 * We therefore have to have separate DLT_ values for them.
 */
#define DLT_ARCNET_LINUX 129	/* ARCNET */

/*
 * 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_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
