The Tcpdump Group git mirrors - libpcap/blob - pcap/nflog.h

   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 */
  48 } nflog_hdr_t;
  49
  50 typedef 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
  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 */
  60 } nflog_packet_hdr_t;
  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 */
  66 } nflog_hwaddr_t;
  67
  68 typedef 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 packets 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