net/batman-adv/packet.h

   1 /*
   2  * Copyright (C) 2007-2010 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner, Simon Wunderlich
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #ifndef _NET_BATMAN_ADV_PACKET_H_
  23 #define _NET_BATMAN_ADV_PACKET_H_
  24
  25 #define ETH_P_BATMAN  0x4305    /* unofficial/not registered Ethertype */
  26
  27 #define BAT_PACKET       0x01
  28 #define BAT_ICMP         0x02
  29 #define BAT_UNICAST      0x03
  30 #define BAT_BCAST        0x04
  31 #define BAT_VIS          0x05
  32 #define BAT_UNICAST_FRAG 0x06
  33
  34 /* this file is included by batctl which needs these defines */
  35 #define COMPAT_VERSION 12
  36 #define DIRECTLINK 0x40
  37 #define VIS_SERVER 0x20
  38 #define PRIMARIES_FIRST_HOP 0x10
  39
  40 /* ICMP message types */
  41 #define ECHO_REPLY 0
  42 #define DESTINATION_UNREACHABLE 3
  43 #define ECHO_REQUEST 8
  44 #define TTL_EXCEEDED 11
  45 #define PARAMETER_PROBLEM 12
  46
  47 /* vis defines */
  48 #define VIS_TYPE_SERVER_SYNC            0
  49 #define VIS_TYPE_CLIENT_UPDATE          1
  50
  51 /* fragmentation defines */
  52 #define UNI_FRAG_HEAD 0x01
  53
  54 struct batman_packet {
  55         uint8_t  packet_type;
  56         uint8_t  version;  /* batman version field */
  57         uint8_t  flags;    /* 0x40: DIRECTLINK flag, 0x20 VIS_SERVER flag... */
  58         uint8_t  tq;
  59         uint32_t seqno;
  60         uint8_t  orig[6];
  61         uint8_t  prev_sender[6];
  62         uint8_t  ttl;
  63         uint8_t  num_hna;
  64         uint8_t  gw_flags;  /* flags related to gateway class */
  65         uint8_t  align;
  66 } __packed;
  67
  68 #define BAT_PACKET_LEN sizeof(struct batman_packet)
  69
  70 struct icmp_packet {
  71         uint8_t  packet_type;
  72         uint8_t  version;  /* batman version field */
  73         uint8_t  msg_type; /* see ICMP message types above */
  74         uint8_t  ttl;
  75         uint8_t  dst[6];
  76         uint8_t  orig[6];
  77         uint16_t seqno;
  78         uint8_t  uid;
  79 } __packed;
  80
  81 #define BAT_RR_LEN 16
  82
  83 /* icmp_packet_rr must start with all fields from imcp_packet
  84  * as this is assumed by code that handles ICMP packets */
  85 struct icmp_packet_rr {
  86         uint8_t  packet_type;
  87         uint8_t  version;  /* batman version field */
  88         uint8_t  msg_type; /* see ICMP message types above */
  89         uint8_t  ttl;
  90         uint8_t  dst[6];
  91         uint8_t  orig[6];
  92         uint16_t seqno;
  93         uint8_t  uid;
  94         uint8_t  rr_cur;
  95         uint8_t  rr[BAT_RR_LEN][ETH_ALEN];
  96 } __packed;
  97
  98 struct unicast_packet {
  99         uint8_t  packet_type;
 100         uint8_t  version;  /* batman version field */
 101         uint8_t  dest[6];
 102         uint8_t  ttl;
 103 } __packed;
 104
 105 struct unicast_frag_packet {
 106         uint8_t  packet_type;
 107         uint8_t  version;  /* batman version field */
 108         uint8_t  dest[6];
 109         uint8_t  ttl;
 110         uint8_t  flags;
 111         uint8_t  orig[6];
 112         uint16_t seqno;
 113 } __packed;
 114
 115 struct bcast_packet {
 116         uint8_t  packet_type;
 117         uint8_t  version;  /* batman version field */
 118         uint8_t  orig[6];
 119         uint8_t  ttl;
 120         uint32_t seqno;
 121 } __packed;
 122
 123 struct vis_packet {
 124         uint8_t  packet_type;
 125         uint8_t  version;        /* batman version field */
 126         uint8_t  vis_type;       /* which type of vis-participant sent this? */
 127         uint8_t  entries;        /* number of entries behind this struct */
 128         uint32_t seqno;          /* sequence number */
 129         uint8_t  ttl;            /* TTL */
 130         uint8_t  vis_orig[6];    /* originator that informs about its
 131                                   * neighbors */
 132         uint8_t  target_orig[6]; /* who should receive this packet */
 133         uint8_t  sender_orig[6]; /* who sent or rebroadcasted this packet */
 134 } __packed;
 135
 136 #endif /* _NET_BATMAN_ADV_PACKET_H_ */