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