/*      $NetBSD: nflog.h,v 1.5 2024/09/02 15:33:39 christos Exp $       */

/*
* Copyright (c) 2013, Petar Alilovic,
* Faculty of Electrical Engineering and Computing, University of Zagreb
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
*       this list of conditions and the following disclaimer.
* * 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/

#ifndef lib_pcap_nflog_h
#define lib_pcap_nflog_h

#include <pcap/pcap-inttypes.h>

/*
* Structure of an NFLOG header and TLV parts, as described at
* https://www.tcpdump.org/linktypes/LINKTYPE_NFLOG.html
*
* The NFLOG header is big-endian.
*
* The TLV length and type are in host byte order.  The value is either
* big-endian or is an array of bytes in some externally-specified byte
* order (text string, link-layer address, link-layer header, packet
* data, etc.).
*/
typedef struct nflog_hdr {
       uint8_t         nflog_family;   /* address family */
       uint8_t         nflog_version;  /* version */
       uint16_t        nflog_rid;      /* resource ID */
} nflog_hdr_t;

typedef struct nflog_tlv {
       uint16_t        tlv_length;     /* tlv length */
       uint16_t        tlv_type;       /* tlv type */
       /* value follows this */
} nflog_tlv_t;

typedef struct nflog_packet_hdr {
       uint16_t        hw_protocol;    /* hw protocol */
       uint8_t         hook;           /* netfilter hook */
       uint8_t         pad;            /* padding to 32 bits */
} nflog_packet_hdr_t;

typedef struct nflog_hwaddr {
       uint16_t        hw_addrlen;     /* address length */
       uint16_t        pad;            /* padding to 32-bit boundary */
       uint8_t         hw_addr[8];     /* address, up to 8 bytes */
} nflog_hwaddr_t;

typedef struct nflog_timestamp {
       uint64_t        sec;
       uint64_t        usec;
} nflog_timestamp_t;

/*
* TLV types.
*/
#define NFULA_PACKET_HDR                1       /* nflog_packet_hdr_t */
#define NFULA_MARK                      2       /* packet mark from skbuff */
#define NFULA_TIMESTAMP                 3       /* nflog_timestamp_t for skbuff's time stamp */
#define NFULA_IFINDEX_INDEV             4       /* ifindex of device on which packet received (possibly bridge group) */
#define NFULA_IFINDEX_OUTDEV            5       /* ifindex of device on which packet transmitted (possibly bridge group) */
#define NFULA_IFINDEX_PHYSINDEV         6       /* ifindex of physical device on which packet received (not bridge group) */
#define NFULA_IFINDEX_PHYSOUTDEV        7       /* ifindex of physical device on which packet transmitted (not bridge group) */
#define NFULA_HWADDR                    8       /* nflog_hwaddr_t for hardware address */
#define NFULA_PAYLOAD                   9       /* packet payload */
#define NFULA_PREFIX                    10      /* text string - null-terminated, count includes NUL */
#define NFULA_UID                       11      /* UID owning socket on which packet was sent/received */
#define NFULA_SEQ                       12      /* sequence number of packets on this NFLOG socket */
#define NFULA_SEQ_GLOBAL                13      /* sequence number of packets on all NFLOG sockets */
#define NFULA_GID                       14      /* GID owning socket on which packet was sent/received */
#define NFULA_HWTYPE                    15      /* ARPHRD_ type of skbuff's device */
#define NFULA_HWHEADER                  16      /* skbuff's MAC-layer header */
#define NFULA_HWLEN                     17      /* length of skbuff's MAC-layer header */

#endif