/*      $NetBSD: sll.h,v 1.6 2024/09/02 15:33:39 christos Exp $ */

/*-
* 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.
*/

/*
* For captures on Linux cooked sockets, we construct a fake header
* that includes:
*
*      a 2-byte "packet type" which is one of:
*
*              LINUX_SLL_HOST          packet was sent to us
*              LINUX_SLL_BROADCAST     packet was broadcast
*              LINUX_SLL_MULTICAST     packet was multicast
*              LINUX_SLL_OTHERHOST     packet was sent to somebody else
*              LINUX_SLL_OUTGOING      packet was sent *by* us;
*
*      a 2-byte Ethernet protocol field;
*
*      a 2-byte link-layer type;
*
*      a 2-byte link-layer address length;
*
*      an 8-byte source link-layer address, whose actual length is
*      specified by the previous value.
*
* All fields except for the link-layer address are in network byte order.
*
* DO NOT change the layout of this structure, or change any of the
* LINUX_SLL_ values below.  If you must change the link-layer header
* for a "cooked" Linux capture, introduce a new DLT_ type (ask
* "[email protected]" for one, so that you don't give it
* a value that collides with a value already being used), and use the
* new header in captures of that type, so that programs that can
* handle DLT_LINUX_SLL captures will continue to handle them correctly
* without any change, and so that capture files with different headers
* can be told apart and programs that read them can dissect the
* packets in them.
*/

#ifndef lib_pcap_sll_h
#define lib_pcap_sll_h

#include <pcap/pcap-inttypes.h>

/*
* A DLT_LINUX_SLL fake link-layer header.
*/
#define SLL_HDR_LEN     16              /* total header length */
#define SLL_ADDRLEN     8               /* length of address field */

struct sll_header {
       uint16_t sll_pkttype;           /* packet type */
       uint16_t sll_hatype;            /* link-layer address type */
       uint16_t sll_halen;             /* link-layer address length */
       uint8_t  sll_addr[SLL_ADDRLEN]; /* link-layer address */
       uint16_t sll_protocol;          /* protocol */
};

/*
* A DLT_LINUX_SLL2 fake link-layer header.
*/
#define SLL2_HDR_LEN    20              /* total header length */

struct sll2_header {
       uint16_t sll2_protocol;                 /* protocol */
       uint16_t sll2_reserved_mbz;             /* reserved - must be zero */
       uint32_t sll2_if_index;                 /* 1-based interface index */
       uint16_t sll2_hatype;                   /* link-layer address type */
       uint8_t  sll2_pkttype;                  /* packet type */
       uint8_t  sll2_halen;                    /* link-layer address length */
       uint8_t  sll2_addr[SLL_ADDRLEN];        /* link-layer address */
};

/*
* The LINUX_SLL_ values for "sll_pkttype" and LINUX_SLL2_ values for
* "sll2_pkttype"; these correspond to the PACKET_ values on Linux,
* which are defined by a header under include/uapi in the current
* kernel source, and are thus not going to change on Linux.  We
* define them here so that they're available even on systems other
* than Linux.
*/
#define LINUX_SLL_HOST          0
#define LINUX_SLL_BROADCAST     1
#define LINUX_SLL_MULTICAST     2
#define LINUX_SLL_OTHERHOST     3
#define LINUX_SLL_OUTGOING      4

/*
* The LINUX_SLL_ values for "sll_protocol" and LINUX_SLL2_ values for
* "sll2_protocol"; these correspond to the ETH_P_ values on Linux, but
* are defined here so that they're available even on systems other than
* Linux.  We assume, for now, that the ETH_P_ values won't change in
* Linux; if they do, then:
*
*      if we don't translate them in "pcap-linux.c", capture files
*      won't necessarily be readable if captured on a system that
*      defines ETH_P_ values that don't match these values;
*
*      if we do translate them in "pcap-linux.c", that makes life
*      unpleasant for the BPF code generator, as the values you test
*      for in the kernel aren't the values that you test for when
*      reading a capture file, so the fixup code run on BPF programs
*      handed to the kernel ends up having to do more work.
*
* Add other values here as necessary, for handling packet types that
* might show up on non-Ethernet, non-802.x networks.  (Not all the ones
* in the Linux "if_ether.h" will, I suspect, actually show up in
* captures.)
*/
#define LINUX_SLL_P_802_3       0x0001  /* Novell 802.3 frames without 802.2 LLC header */
#define LINUX_SLL_P_802_2       0x0004  /* 802.2 frames (not D/I/X Ethernet) */
#define LINUX_SLL_P_CAN         0x000C  /* CAN frames, with SocketCAN pseudo-headers */
#define LINUX_SLL_P_CANFD       0x000D  /* CAN FD frames, with SocketCAN pseudo-headers */
#define LINUX_SLL_P_CANXL       0x000E  /* CAN XL frames, with SocketCAN pseudo-headers */

#endif

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