epan/dissectors/packet-ripng.c

   1 /* packet-ripng.c
   2  * Routines for RIPng disassembly
   3  * (c) Copyright Jun-ichiro itojun Hagino <itojun@itojun.org>
   4  * derived from packet-rip.c
   5  *
   6  * $Id$
   7  *
   8  * Wireshark - Network traffic analyzer
   9  * By Gerald Combs <gerald@wireshark.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  * Enhance RIPng by Alexis La Goutte
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  27  *
  28  * References:
  29  * RFC2080: RIPng for IPv6
  30  */
  31
  32 #include "config.h"
  33
  34 #include <glib.h>
  35 #include <epan/packet.h>
  36 #include <epan/to_str.h>
  37
  38 static int proto_ripng = -1;
  39 static int hf_ripng_cmd = -1;
  40 static int hf_ripng_version = -1;
  41 static int hf_ripng_reserved = -1;
  42
  43 static int hf_ripng_rte = -1;
  44 static int hf_ripng_rte_ipv6_prefix = -1;
  45 static int hf_ripng_rte_route_tag = -1;
  46 static int hf_ripng_rte_prefix_length = -1;
  47 static int hf_ripng_rte_metric = -1;
  48
  49 static gint ett_ripng = -1;
  50 static gint ett_ripng_rte = -1;
  51
  52 #define UDP_PORT_RIPNG  521
  53
  54 #define RIP6_REQUEST    1
  55 #define RIP6_RESPONSE   2
  56
  57 static const value_string cmdvals[] = {
  58     { RIP6_REQUEST, "Request" },
  59     { RIP6_RESPONSE, "Response" },
  60     { 0, NULL },
  61 };
  62
  63 static void
  64 dissect_ripng(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
  65     int offset = 0;
  66     proto_tree *ripng_tree = NULL, *rte_tree = NULL;
  67     proto_item *ti, *rte_ti;
  68
  69     col_set_str(pinfo->cinfo, COL_PROTOCOL, "RIPng");
  70         col_add_fstr(pinfo->cinfo, COL_INFO," Command %s, Version %u",
  71                      val_to_str(tvb_get_guint8(tvb, offset), cmdvals, "Unknown (%u)"),
  72                      tvb_get_guint8(tvb, offset +1));
  73
  74     if (tree) {
  75         ti = proto_tree_add_item(tree, proto_ripng, tvb, offset, -1, ENC_NA);
  76         ripng_tree = proto_item_add_subtree(ti, ett_ripng);
  77
  78         /* Command */
  79         proto_tree_add_item(ripng_tree, hf_ripng_cmd, tvb, offset, 1, ENC_BIG_ENDIAN);
  80         offset += 1;
  81
  82         /* Version */
  83         proto_tree_add_item(ripng_tree, hf_ripng_version, tvb, offset, 1, ENC_BIG_ENDIAN);
  84         offset += 1;
  85
  86         /* Reserved */
  87         proto_tree_add_item(ripng_tree, hf_ripng_reserved, tvb, offset, 2, ENC_NA);
  88         offset += 2;
  89
  90         /* Route Table Entry */
  91         while (tvb_reported_length_remaining(tvb, offset) > 0) {
  92
  93                 rte_ti = proto_tree_add_item(ripng_tree, hf_ripng_rte, tvb, offset, 16 + 2 + 1 + 1, ENC_NA);
  94                 rte_tree = proto_item_add_subtree(rte_ti, ett_ripng_rte);
  95
  96                 /* IPv6 Prefix */
  97                 proto_tree_add_item(rte_tree, hf_ripng_rte_ipv6_prefix, tvb, offset, 16, ENC_NA);
  98                 proto_item_append_text(rte_ti, ": IPv6 Prefix: %s", tvb_ip6_to_str(tvb, offset));
  99                 offset += 16;
 100
 101                 /* Route Tag */
 102                 proto_tree_add_item(rte_tree, hf_ripng_rte_route_tag, tvb, offset, 2, ENC_BIG_ENDIAN);
 103                 offset += 2;
 104
 105                 /* Prefix Length */
 106                 proto_tree_add_item(rte_tree, hf_ripng_rte_prefix_length, tvb, offset, 1, ENC_BIG_ENDIAN);
 107                 proto_item_append_text(rte_ti, "/%u", tvb_get_guint8(tvb, offset));
 108                 offset += 1;
 109
 110                 /* Metric */
 111                 proto_tree_add_item(rte_tree, hf_ripng_rte_metric, tvb, offset, 1, ENC_BIG_ENDIAN);
 112                 proto_item_append_text(rte_ti, " Metric: %u", tvb_get_guint8(tvb, offset));
 113                 offset += 1;
 114         }
 115     }
 116 }
 117
 118 void
 119 proto_register_ripng(void)
 120 {
 121     static hf_register_info hf[] = {
 122       { &hf_ripng_cmd,
 123         { "Command",            "ripng.cmd",
 124         FT_UINT8, BASE_DEC, VALS(cmdvals), 0x0,
 125         "Used to specify the purpose of this message", HFILL }},
 126       { &hf_ripng_version,
 127         { "Version",            "ripng.version",
 128         FT_UINT8, BASE_DEC, NULL, 0x0,
 129         "Version of RIPng", HFILL }},
 130       { &hf_ripng_reserved,
 131         { "Reserved",           "ripng.reserved",
 132         FT_BYTES, BASE_NONE, NULL, 0x0,
 133         "Must be Zero", HFILL }},
 134       { &hf_ripng_rte,
 135         { "Route Table Entry",          "ripng.rte",
 136         FT_NONE, BASE_NONE, NULL, 0x0,
 137         NULL, HFILL }},
 138       { &hf_ripng_rte_ipv6_prefix,
 139         { "IPv6 Prefix",                "ripng.rte.ipv6_prefix",
 140         FT_IPv6, BASE_NONE, NULL, 0x0,
 141         "Destination", HFILL }},
 142       { &hf_ripng_rte_route_tag,
 143         { "Route Tag",          "ripng.rte.route_tag",
 144         FT_UINT16, BASE_HEX, NULL, 0x0,
 145         "Provides a method of separating internal RIPng routes (routes for networks within the RIPng routing domain) from external RIPng routes, which may have been imported from an EGP or another IGP", HFILL }},
 146
 147       { &hf_ripng_rte_prefix_length,
 148         { "Prefix Length",              "ripng.rte.prefix_length",
 149         FT_UINT8, BASE_DEC, NULL, 0x0,
 150         "The length in bits of the significant part of the prefix starting from the left of the prefix", HFILL }},
 151
 152       { &hf_ripng_rte_metric,
 153         { "Metric",             "ripng.rte.metric",
 154         FT_UINT8, BASE_DEC, NULL, 0x0,
 155         "The current metric for the destination; the value 16 (infinity) indicates that the destination is not reachable", HFILL }},
 156     };
 157
 158     static gint *ett[] = {
 159       &ett_ripng,
 160       &ett_ripng_rte,
 161     };
 162
 163     proto_ripng = proto_register_protocol("RIPng", "RIPng", "ripng");
 164     proto_register_field_array(proto_ripng, hf, array_length(hf));
 165     proto_register_subtree_array(ett, array_length(ett));
 166 }
 167
 168 void
 169 proto_reg_handoff_ripng(void)
 170 {
 171     dissector_handle_t ripng_handle;
 172
 173     ripng_handle = create_dissector_handle(dissect_ripng, proto_ripng);
 174     dissector_add_uint("udp.port", UDP_PORT_RIPNG, ripng_handle);
 175 }