src/proto_ipv6_mobility_hdr.h

   1 /*
   2  * netsniff-ng - the packet sniffing beast
   3  * Copyright 2012 Markus Amend <markus@netsniff-ng.org>
   4  * Subject to the GPL, version 2.
   5  *
   6  * IPv6 Mobility Header described in RFC6275
   7  */
   8
   9 #ifndef PROTO_IPV6_MOBILITY_HDR_H
  10 #define PROTO_IPV6_MOBILITY_HDR_H
  11
  12 #include <stdio.h>
  13 #include <stdint.h>
  14 #include <netinet/in.h>    /* for ntohs() */
  15
  16 #include "proto_struct.h"
  17 #include "dissector_eth.h"
  18 #include "built_in.h"
  19
  20 #define BINDING_REFRESH_REQUEST_MESSAGE 0x00
  21 #define HOME_TEST_INIT_MESSAGE          0x01
  22 #define CARE_OF_TEST_INIT_MESSAGE       0x02
  23 #define HOME_TEST_MESSAGE               0x03
  24 #define CARE_OF_TEST_MESSAGE            0x04
  25 #define BINDING_UPDATE_MESSAGE          0x05
  26 #define BINDING_ACKNOWLEDGEMENT_MESSAGE 0x06
  27 #define BINDING_ERROR_MESSAGE           0x07
  28
  29 struct mobilityhdr {
  30         uint8_t         payload_proto;
  31         uint8_t         hdr_len;
  32         uint8_t         MH_type;
  33         uint8_t         reserved;
  34         uint16_t        chksum;
  35         uint8_t         msgdata[0];
  36 } __packed;
  37
  38 struct bin_refr_req_msg {
  39         uint16_t        reserved;
  40         uint8_t         mobility_opt[0];
  41 } __packed;
  42
  43 /* for 0x01 and 0x02 */
  44 struct tst_init_msg {
  45         uint16_t        reserved;
  46         uint64_t        init_cookie;
  47         uint8_t         mobility_opt[0];
  48 } __packed;
  49
  50 /* for 0x03 and 0x04 */
  51 struct tst_msg {
  52         uint16_t        nonce_index;
  53         uint64_t        init_cookie;
  54         uint64_t        keygen_token;
  55         uint8_t         mobility_opt[0];
  56 } __packed;
  57
  58 struct bind_upd_msg {
  59         uint16_t        sequence;
  60         uint16_t        ahlk_res;
  61         uint16_t        lifetime;
  62         uint8_t         mobility_opt[0];
  63 } __packed;
  64
  65 struct bind_ack_msg {
  66         uint8_t         status;
  67         uint8_t         k_res;
  68         uint16_t        sequence;
  69         uint16_t        lifetime;
  70         uint8_t         mobility_opt[0];
  71 } __packed;
  72
  73 struct bind_err_msg {
  74         uint8_t         status;
  75         uint8_t         res;
  76         uint64_t        home_addr;
  77         uint8_t         mobility_opt[0];
  78 } __packed;
  79
  80
  81 static inline void dissect_mobility_options(struct pkt_buff *pkt,
  82                                              size_t *message_data_len)
  83 {
  84         /* Have to been upgraded.
  85          * http://tools.ietf.org/html/rfc6275#section-6.2.1
  86          */
  87         if (*message_data_len)
  88                 tprintf("MH Option(s) recognized ");
  89
  90         /* If adding dissector reduce message_data_len for each using of
  91          * pkt_pull to the same size.
  92          */
  93 }
  94
  95 static inline void dissect_mobilityhdr_type_0(struct pkt_buff *pkt,
  96                                               size_t *message_data_len)
  97 {
  98         struct bin_refr_req_msg *type_0;
  99
 100         type_0 = (struct bin_refr_req_msg *) pkt_pull(pkt, sizeof(*type_0));
 101         *message_data_len -= sizeof(*type_0);
 102         if (type_0 == NULL || *message_data_len > pkt_len(pkt))
 103                 return;
 104
 105         dissect_mobility_options(pkt, message_data_len);
 106 }
 107
 108 static inline void dissect_mobilityhdr_type_1_2(struct pkt_buff *pkt,
 109                                                 size_t *message_data_len)
 110 {
 111         struct tst_init_msg *type_1_2;
 112
 113         type_1_2 = (struct tst_init_msg *) pkt_pull(pkt, sizeof(*type_1_2));
 114         *message_data_len -= sizeof(*type_1_2);
 115         if (type_1_2 == NULL || *message_data_len > pkt_len(pkt))
 116                 return;
 117
 118         tprintf("Init Cookie (0x%x)", ntohll(type_1_2->init_cookie));
 119
 120         dissect_mobility_options(pkt, message_data_len);
 121 }
 122
 123 static inline void dissect_mobilityhdr_type_3_4(struct pkt_buff *pkt,
 124                                                 size_t *message_data_len)
 125 {
 126         struct tst_msg *type_3_4;
 127
 128         type_3_4 = (struct tst_msg *) pkt_pull(pkt, sizeof(*type_3_4));
 129         *message_data_len -= sizeof(*type_3_4);
 130         if (type_3_4 == NULL || *message_data_len > pkt_len(pkt))
 131                 return;
 132
 133         tprintf("HN Index (%u) ", ntohs(type_3_4->nonce_index));
 134         tprintf("Init Cookie (0x%x) ", ntohll(type_3_4->init_cookie));
 135         tprintf("Keygen Token (0x%x)", ntohll(type_3_4->keygen_token));
 136
 137         dissect_mobility_options(pkt, message_data_len);
 138 }
 139
 140 static inline void dissect_mobilityhdr_type_5(struct pkt_buff *pkt,
 141                                                 size_t *message_data_len)
 142 {
 143         struct bind_upd_msg *type_5;
 144
 145         type_5 = (struct bind_upd_msg *) pkt_pull(pkt, sizeof(*type_5));
 146         *message_data_len -= sizeof(*type_5);
 147         if (type_5 == NULL || *message_data_len > pkt_len(pkt))
 148                 return;
 149
 150         tprintf("Sequence (0x%x) ", ntohs(type_5->sequence));
 151         tprintf("A|H|L|K (0x%x) ", ntohs(type_5->ahlk_res) >> 12);
 152         tprintf("Lifetime (%us)", ntohs(type_5->lifetime) * 4);
 153
 154         dissect_mobility_options(pkt, message_data_len);
 155 }
 156
 157 static inline void dissect_mobilityhdr_type_6(struct pkt_buff *pkt,
 158                                                 size_t *message_data_len)
 159 {
 160         struct bind_ack_msg *type_6;
 161
 162         type_6 = (struct bind_ack_msg *) pkt_pull(pkt, sizeof(*type_6));
 163         *message_data_len -= sizeof(*type_6);
 164         if (type_6 == NULL || *message_data_len > pkt_len(pkt))
 165                 return;
 166
 167         tprintf("Status (0x%x) ", type_6->status);
 168         tprintf("K (%u) ", type_6->k_res >> 7);
 169         tprintf("Sequence (0x%x)", ntohs(type_6->sequence));
 170         tprintf("Lifetime (%us)", ntohs(type_6->lifetime) * 4);
 171
 172         dissect_mobility_options(pkt, message_data_len);
 173 }
 174
 175 static inline void dissect_mobilityhdr_type_7(struct pkt_buff *pkt,
 176                                                 size_t *message_data_len)
 177 {
 178         char address[INET6_ADDRSTRLEN];
 179         uint64_t addr;
 180         struct bind_err_msg *type_7;
 181
 182         type_7 = (struct bind_err_msg *) pkt_pull(pkt, sizeof(*type_7));
 183         *message_data_len -= sizeof(*type_7);
 184         addr = ntohll(type_7->home_addr);
 185         if (type_7 == NULL || *message_data_len > pkt_len(pkt))
 186                 return;
 187
 188         tprintf("Status (0x%x) ", type_7->status);
 189         tprintf("Home Addr (%s)",
 190                 inet_ntop(AF_INET6, &addr, address,
 191                 sizeof(address)));
 192
 193         dissect_mobility_options(pkt, message_data_len);
 194 }
 195
 196 static inline void get_mh_type(struct pkt_buff *pkt,
 197                                size_t *message_data_len, uint8_t *mh_type)
 198 {
 199         switch (*mh_type) {
 200         case BINDING_REFRESH_REQUEST_MESSAGE:
 201                 tprintf("Binding Refresh Request Message ");
 202                 dissect_mobilityhdr_type_0(pkt, message_data_len);
 203                 break;
 204         case HOME_TEST_INIT_MESSAGE:
 205                 tprintf("Home Test Init Message ");
 206                 dissect_mobilityhdr_type_1_2(pkt, message_data_len);
 207                 break;
 208         case CARE_OF_TEST_INIT_MESSAGE:
 209                 tprintf("Care-of Test Init Message ");
 210                 dissect_mobilityhdr_type_1_2(pkt, message_data_len);
 211                 break;
 212         case HOME_TEST_MESSAGE:
 213                 tprintf("Binding Refresh Request Message ");
 214                 dissect_mobilityhdr_type_3_4(pkt, message_data_len);
 215                 break;
 216         case CARE_OF_TEST_MESSAGE:
 217                 tprintf("Binding Refresh Request Message ");
 218                 dissect_mobilityhdr_type_3_4(pkt, message_data_len);
 219                 break;
 220         case BINDING_UPDATE_MESSAGE:
 221                 tprintf("Binding Refresh Request Message ");
 222                 dissect_mobilityhdr_type_5(pkt, message_data_len);
 223                 break;
 224         case BINDING_ACKNOWLEDGEMENT_MESSAGE:
 225                 tprintf("Binding Refresh Request Message ");
 226                 dissect_mobilityhdr_type_6(pkt, message_data_len);
 227                 break;
 228         case BINDING_ERROR_MESSAGE:
 229                 tprintf("Binding Refresh Request Message ");
 230                 dissect_mobilityhdr_type_7(pkt, message_data_len);
 231                 break;
 232         default:
 233                 tprintf("Type %u is unknown. Error", *mh_type);
 234         }
 235 }
 236
 237 static inline void mobility(struct pkt_buff *pkt)
 238 {
 239         uint8_t hdr_ext_len;
 240         size_t message_data_len;
 241         struct mobilityhdr *mobility;
 242
 243         mobility = (struct mobilityhdr *) pkt_pull(pkt, sizeof(*mobility));
 244
 245         /* Total Header Length in Bytes */
 246         hdr_ext_len = (mobility->hdr_len + 1) * 8;
 247         /* Total Message Data length in Bytes*/
 248         message_data_len = (hdr_ext_len - sizeof(*mobility));
 249         if (mobility == NULL || message_data_len > pkt_len(pkt))
 250                 return;
 251
 252         tprintf("\t [ Mobility ");
 253         tprintf("NextHdr (%u), ", mobility->payload_proto);
 254         tprintf("HdrExtLen (%u, %u Bytes), ", mobility->hdr_len,
 255                 hdr_ext_len);
 256         tprintf("MH Type (%u), ", mobility->MH_type);
 257         tprintf("Res (0x%x), ", mobility->reserved);
 258         tprintf("Chks (0x%x), ", ntohs(mobility->chksum));
 259         tprintf("MH Data ");
 260
 261         get_mh_type(pkt, &message_data_len, &mobility->MH_type);
 262
 263         tprintf(" ]\n");
 264
 265         pkt_pull(pkt, message_data_len);
 266         pkt_set_proto(pkt, &eth_lay3, mobility->payload_proto);
 267 }
 268
 269 static inline void mobility_less(struct pkt_buff *pkt)
 270 {
 271         uint8_t hdr_ext_len;
 272         size_t message_data_len;
 273         struct mobilityhdr *mobility;
 274
 275         mobility = (struct mobilityhdr *) pkt_pull(pkt, sizeof(*mobility));
 276
 277         /* Total Header Length in Bytes */
 278         hdr_ext_len = (mobility->hdr_len + 1) * 8;
 279         /* Total Message Data length in Bytes*/
 280         message_data_len = (hdr_ext_len - sizeof(*mobility));
 281         if (mobility == NULL || message_data_len > pkt_len(pkt))
 282                 return;
 283
 284         tprintf(" Mobility Type (%u), ", mobility->MH_type);
 285
 286         pkt_pull(pkt, message_data_len);
 287         pkt_set_proto(pkt, &eth_lay3, mobility->payload_proto);
 288 }
 289
 290 struct protocol ipv6_mobility_ops = {
 291         .key = 0x87,
 292         .print_full = mobility,
 293         .print_less = mobility_less,
 294 };
 295
 296 #endif /* PROTO_IPV6_MOBILITY_HDR_H */