libpcap  1.10.1
About: libpcap is a packet filter library used by tools like tcpdump.
  Fossies Dox: libpcap-1.10.1.tar.gz  ("unofficial" and yet experimental doxygen-generated source code documentation)  

nflog.h
Go to the documentation of this file.
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  */
44 typedef struct nflog_hdr {
45  uint8_t nflog_family; /* address family */
46  uint8_t nflog_version; /* version */
47  uint16_t nflog_rid; /* resource ID */
49 
50 typedef struct nflog_tlv {
51  uint16_t tlv_length; /* tlv length */
52  uint16_t tlv_type; /* tlv type */
53  /* value follows this */
55 
56 typedef 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 */
61 
62 typedef 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 */
67 
68 typedef struct nflog_timestamp {
69  uint64_t sec;
70  uint64_t usec;
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
struct nflog_tlv nflog_tlv_t
struct nflog_timestamp nflog_timestamp_t
struct nflog_hdr nflog_hdr_t
struct nflog_packet_hdr nflog_packet_hdr_t
struct nflog_hwaddr nflog_hwaddr_t
uint8_t nflog_version
Definition: nflog.h:46
uint8_t nflog_family
Definition: nflog.h:45
uint16_t nflog_rid
Definition: nflog.h:47
uint16_t hw_addrlen
Definition: nflog.h:63
uint8_t hw_addr[8]
Definition: nflog.h:65
uint16_t pad
Definition: nflog.h:64
uint8_t hook
Definition: nflog.h:58
uint16_t hw_protocol
Definition: nflog.h:57
uint8_t pad
Definition: nflog.h:59
uint64_t sec
Definition: nflog.h:69
uint64_t usec
Definition: nflog.h:70
uint16_t tlv_length
Definition: nflog.h:51
uint16_t tlv_type
Definition: nflog.h:52