1/*	$NetBSD: nflog.h,v 1.5 2024/09/02 15:33:39 christos Exp $	*/
2
3/*
4 * Copyright (c) 2013, Petar Alilovic,
5 * Faculty of Electrical Engineering and Computing, University of Zagreb
6 * All rights reserved
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions are met:
10 *
11 * * Redistributions of source code must retain the above copyright notice,
12 *	 this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 *	 notice, this list of conditions and the following disclaimer in the
15 *	 documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
18 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
19 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
20 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY
21 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
22 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
23 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
24 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
27 * DAMAGE.
28 */
29
30#ifndef lib_pcap_nflog_h
31#define lib_pcap_nflog_h
32
33#include <pcap/pcap-inttypes.h>
34
35/*
36 * Structure of an NFLOG header and TLV parts, as described at
37 * https://www.tcpdump.org/linktypes/LINKTYPE_NFLOG.html
38 *
39 * The NFLOG header is big-endian.
40 *
41 * The TLV length and type are in host byte order.  The value is either
42 * big-endian or is an array of bytes in some externally-specified byte
43 * order (text string, link-layer address, link-layer header, packet
44 * data, etc.).
45 */
46typedef struct nflog_hdr {
47	uint8_t		nflog_family;	/* address family */
48	uint8_t		nflog_version;	/* version */
49	uint16_t	nflog_rid;	/* resource ID */
50} nflog_hdr_t;
51
52typedef struct nflog_tlv {
53	uint16_t	tlv_length;	/* tlv length */
54	uint16_t	tlv_type;	/* tlv type */
55	/* value follows this */
56} nflog_tlv_t;
57
58typedef struct nflog_packet_hdr {
59	uint16_t	hw_protocol;	/* hw protocol */
60	uint8_t		hook;		/* netfilter hook */
61	uint8_t		pad;		/* padding to 32 bits */
62} nflog_packet_hdr_t;
63
64typedef struct nflog_hwaddr {
65	uint16_t	hw_addrlen;	/* address length */
66	uint16_t	pad;		/* padding to 32-bit boundary */
67	uint8_t		hw_addr[8];	/* address, up to 8 bytes */
68} nflog_hwaddr_t;
69
70typedef struct nflog_timestamp {
71	uint64_t	sec;
72	uint64_t	usec;
73} nflog_timestamp_t;
74
75/*
76 * TLV types.
77 */
78#define NFULA_PACKET_HDR		1	/* nflog_packet_hdr_t */
79#define NFULA_MARK			2	/* packet mark from skbuff */
80#define NFULA_TIMESTAMP			3	/* nflog_timestamp_t for skbuff's time stamp */
81#define NFULA_IFINDEX_INDEV		4	/* ifindex of device on which packet received (possibly bridge group) */
82#define NFULA_IFINDEX_OUTDEV		5	/* ifindex of device on which packet transmitted (possibly bridge group) */
83#define NFULA_IFINDEX_PHYSINDEV		6	/* ifindex of physical device on which packet received (not bridge group) */
84#define NFULA_IFINDEX_PHYSOUTDEV	7	/* ifindex of physical device on which packet transmitted (not bridge group) */
85#define NFULA_HWADDR			8	/* nflog_hwaddr_t for hardware address */
86#define NFULA_PAYLOAD			9	/* packet payload */
87#define NFULA_PREFIX			10	/* text string - null-terminated, count includes NUL */
88#define NFULA_UID			11	/* UID owning socket on which packet was sent/received */
89#define NFULA_SEQ			12	/* sequence number of packets on this NFLOG socket */
90#define NFULA_SEQ_GLOBAL		13	/* sequence number of packets on all NFLOG sockets */
91#define NFULA_GID			14	/* GID owning socket on which packet was sent/received */
92#define NFULA_HWTYPE			15	/* ARPHRD_ type of skbuff's device */
93#define NFULA_HWHEADER			16	/* skbuff's MAC-layer header */
94#define NFULA_HWLEN			17	/* length of skbuff's MAC-layer header */
95
96#endif
97