pcap/nflog.h

/*
 * 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 pakets 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