src/vpn/gnunet-vpn-packet.h

   1 #ifndef _GNTUN_PACKET_H_
   2 #define _GNTUN_PACKET_H_
   3
   4 #include "platform.h"
   5 #include "gnunet_common.h"
   6
   7 // Headers
   8 struct pkt_tun {
   9         unsigned flags:16 GNUNET_PACKED;
  10         unsigned type:16 GNUNET_PACKED;
  11 };
  12
  13 struct ip6_hdr {
  14         unsigned tclass_h:4 GNUNET_PACKED;
  15         unsigned version:4 GNUNET_PACKED;
  16         unsigned tclass_l:4 GNUNET_PACKED;
  17         unsigned flowlbl:20 GNUNET_PACKED;
  18         unsigned paylgth:16 GNUNET_PACKED;
  19         unsigned nxthdr:8 GNUNET_PACKED;
  20         unsigned hoplmt:8 GNUNET_PACKED;
  21         unsigned char sadr[16];
  22         unsigned char dadr[16];
  23 };
  24
  25 struct ip_hdr {
  26         unsigned hdr_lngth:4 GNUNET_PACKED;
  27         unsigned version:4 GNUNET_PACKED;
  28
  29         unsigned diff_serv:8 GNUNET_PACKED;
  30         unsigned tot_lngth:16 GNUNET_PACKED;
  31
  32         unsigned ident:16 GNUNET_PACKED;
  33         unsigned flags:3 GNUNET_PACKED;
  34         unsigned frag_off:13 GNUNET_PACKED;
  35
  36         unsigned ttl:8 GNUNET_PACKED;
  37         unsigned proto:8 GNUNET_PACKED;
  38         unsigned chks:16 GNUNET_PACKED;
  39
  40         unsigned sadr:32 GNUNET_PACKED;
  41         unsigned dadr:32 GNUNET_PACKED;
  42 };
  43
  44 #define TCP_FLAG_SYN 2
  45
  46 struct tcp_pkt {
  47         unsigned spt:16 GNUNET_PACKED;
  48         unsigned dpt:16 GNUNET_PACKED;
  49         unsigned seq:32 GNUNET_PACKED;
  50         unsigned ack:32 GNUNET_PACKED;
  51         unsigned off:4 GNUNET_PACKED;
  52         unsigned rsv:4 GNUNET_PACKED;
  53         unsigned flg:8 GNUNET_PACKED;
  54         unsigned wsz:16 GNUNET_PACKED;
  55         unsigned crc:16 GNUNET_PACKED;
  56         unsigned urg:16 GNUNET_PACKED;
  57 };
  58
  59 struct udp_pkt {
  60         unsigned spt:16 GNUNET_PACKED;
  61         unsigned dpt:16 GNUNET_PACKED;
  62         unsigned len:16 GNUNET_PACKED;
  63         unsigned crc:16 GNUNET_PACKED;
  64 };
  65
  66 struct icmp_hdr {
  67     unsigned type:8 GNUNET_PACKED;
  68     unsigned code:8 GNUNET_PACKED;
  69     unsigned chks:16 GNUNET_PACKED;
  70 };
  71
  72 // DNS-Stuff
  73 struct dns_static {
  74         uint16_t id GNUNET_PACKED;
  75
  76         unsigned rd:1 GNUNET_PACKED; // recursion desired (client -> server)
  77         unsigned tc:1 GNUNET_PACKED; // message is truncated
  78         unsigned aa:1 GNUNET_PACKED; // authoritative answer
  79         unsigned op:4 GNUNET_PACKED; // query:0, inverse q.:1, status: 2
  80         unsigned qr:1 GNUNET_PACKED; // query:0, response:1
  81
  82         unsigned rcode:4 GNUNET_PACKED; // 0 No error
  83                           // 1 Format error
  84                           // 2 Server failure
  85                           // 3 Name Error
  86                           // 4 Not Implemented
  87                           // 5 Refused
  88         unsigned z:3 GNUNET_PACKED;  // reserved
  89         unsigned ra:1 GNUNET_PACKED; // recursion available (server -> client)
  90
  91         uint16_t qdcount GNUNET_PACKED; // number of questions
  92         uint16_t ancount GNUNET_PACKED; // number of answers
  93         uint16_t nscount GNUNET_PACKED; // number of authority-records
  94         uint16_t arcount GNUNET_PACKED; // number of additional records
  95 };
  96
  97 struct dns_pkt {
  98         struct dns_static s;
  99         unsigned char data[1];
 100 };
 101
 102 struct dns_pkt_parsed {
 103         struct dns_static s;
 104         struct dns_query** queries;
 105         struct dns_record** answers;
 106         struct dns_record** nameservers;
 107         struct dns_record** additional;
 108 };
 109
 110 struct dns_query_line {
 111     unsigned short type;
 112     unsigned short class;
 113 };
 114
 115 struct dns_query {
 116         char* name;
 117         unsigned char namelen;
 118         unsigned short qtype;
 119         unsigned short qclass;
 120 };
 121
 122 struct dns_record_line {
 123     unsigned short type;
 124     unsigned short class;
 125     unsigned int ttl;
 126     unsigned short data_len;
 127     unsigned char data;
 128 };
 129
 130 struct dns_record {
 131         char* name;
 132         unsigned char namelen;
 133         unsigned short type;
 134         unsigned short class;
 135         unsigned int ttl;
 136         unsigned short data_len;
 137         unsigned char* data;
 138 };
 139
 140 struct udp_dns {
 141         struct udp_pkt udp_hdr;
 142         struct dns_pkt data;
 143 };
 144
 145 // Complete Packets
 146 struct tun_pkt {
 147         struct GNUNET_MessageHeader shdr;
 148         struct pkt_tun tun;
 149 };
 150
 151 struct ip6_pkt {
 152         struct GNUNET_MessageHeader shdr;
 153         struct pkt_tun tun;
 154         struct ip6_hdr ip6_hdr;
 155         unsigned char data[1];
 156 };
 157
 158 struct ip6_tcp {
 159         struct GNUNET_MessageHeader shdr;
 160         struct pkt_tun tun;
 161         struct ip6_hdr ip6_hdr;
 162         struct tcp_pkt tcp_hdr;
 163         unsigned char data[1];
 164 };
 165
 166 struct ip6_icmp {
 167     struct GNUNET_MessageHeader shdr;
 168     struct pkt_tun tun;
 169     struct ip6_hdr ip6_hdr;
 170     struct icmp_hdr icmp_hdr;
 171 };
 172
 173 struct ip6_udp {
 174         struct GNUNET_MessageHeader shdr;
 175         struct pkt_tun tun;
 176         struct ip6_hdr ip6_hdr;
 177         struct udp_pkt udp_hdr;
 178         unsigned char data[1];
 179 };
 180
 181 struct ip6_udp_dns {
 182         struct GNUNET_MessageHeader shdr;
 183         struct pkt_tun tun;
 184         struct ip6_hdr ip6_hdr;
 185         struct udp_dns udp_dns;
 186 };
 187
 188 struct ip_pkt {
 189         struct GNUNET_MessageHeader shdr;
 190         struct pkt_tun tun;
 191         struct ip_hdr ip_hdr;
 192         unsigned char data[1];
 193 };
 194
 195 struct ip_udp {
 196         struct GNUNET_MessageHeader shdr;
 197         struct pkt_tun tun;
 198         struct ip_hdr ip_hdr;
 199         struct udp_pkt udp_hdr;
 200         unsigned char data[1];
 201 };
 202
 203 struct ip_udp_dns {
 204         struct GNUNET_MessageHeader shdr;
 205         struct pkt_tun tun;
 206         struct ip_hdr ip_hdr;
 207         struct udp_dns udp_dns;
 208 };
 209
 210 struct ip_tcp {
 211         struct GNUNET_MessageHeader shdr;
 212         struct pkt_tun tun;
 213         struct ip_hdr ip_hdr;
 214         struct tcp_pkt tcp_hdr;
 215         unsigned char data[1];
 216 };
 217
 218 #endif