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  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  25  */
  26
  27 #include "config.h"
  28
  29 #include <string.h>
  30 #include <glib.h>
  31 #include <epan/packet.h>
  32 #include "packet-ripng.h"
  33
  34 #ifndef offsetof
  35 #define offsetof(type, member)  ((size_t)(&((type *)0)->member))
  36 #endif
  37
  38 static int proto_ripng = -1;
  39 static int hf_ripng_cmd = -1;
  40 static int hf_ripng_version = -1;
  41
  42 static gint ett_ripng = -1;
  43 static gint ett_ripng_addr = -1;
  44
  45 #define UDP_PORT_RIPNG  521
  46
  47 static const value_string cmdvals[] = {
  48     { RIP6_REQUEST, "Request" },
  49     { RIP6_RESPONSE, "Response" },
  50     { 0, NULL },
  51 };
  52
  53 static void
  54 dissect_ripng(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
  55     int offset = 0;
  56     struct rip6 rip6;
  57     struct netinfo6 ni6;
  58     proto_tree *ripng_tree = NULL;
  59     proto_tree *subtree = NULL;
  60     proto_item *ti;
  61
  62     col_set_str(pinfo->cinfo, COL_PROTOCOL, "RIPng");
  63     col_clear(pinfo->cinfo, COL_INFO);
  64
  65     /* avoid alignment problem */
  66     tvb_memcpy(tvb, (guint8 *)&rip6, offset, sizeof(rip6));
  67
  68     if (check_col(pinfo->cinfo, COL_PROTOCOL))
  69         col_add_fstr(pinfo->cinfo, COL_PROTOCOL, "RIPng version %u", rip6.rip6_vers);
  70     if (check_col(pinfo->cinfo, COL_INFO))
  71         col_add_str(pinfo->cinfo, COL_INFO,
  72             val_to_str(rip6.rip6_cmd, cmdvals, "Unknown command (%u)"));
  73
  74     if (tree) {
  75         ti = proto_tree_add_item(tree, proto_ripng, tvb, offset, -1, FALSE);
  76         ripng_tree = proto_item_add_subtree(ti, ett_ripng);
  77
  78         proto_tree_add_uint(ripng_tree, hf_ripng_cmd, tvb, offset, 1,
  79             rip6.rip6_cmd);
  80         proto_tree_add_uint(ripng_tree, hf_ripng_version, tvb, offset + 1, 1,
  81             rip6.rip6_vers);
  82
  83         offset += 4;
  84         while (tvb_reported_length_remaining(tvb, offset) > 0) {
  85                     tvb_memcpy(tvb, (guint8 *)&ni6, offset, sizeof(ni6));
  86                     if (ni6.rip6_tag) {
  87                         ti = proto_tree_add_text(ripng_tree, tvb, offset,
  88                                         sizeof(ni6), "IP Address: %s/%u, Metric: %u, tag: 0x%04x",
  89                                         ip6_to_str(&ni6.rip6_dest),
  90                                         ni6.rip6_plen,
  91                                         ni6.rip6_metric,
  92                                         g_ntohs(ni6.rip6_tag));
  93                     } else {
  94                         ti = proto_tree_add_text(ripng_tree, tvb, offset,
  95                                         sizeof(ni6), "IP Address: %s/%u, Metric: %u",
  96                                         ip6_to_str(&ni6.rip6_dest),
  97                                         ni6.rip6_plen,
  98                                         ni6.rip6_metric);
  99                     }
 100                     subtree = proto_item_add_subtree(ti, ett_ripng_addr);
 101                     proto_tree_add_text(subtree, tvb,
 102                                 offset + offsetof(struct netinfo6, rip6_dest),
 103                                 sizeof(ni6.rip6_dest), "IP Address: %s",
 104                                 ip6_to_str(&ni6.rip6_dest));
 105                     proto_tree_add_text(subtree, tvb,
 106                                 offset + offsetof(struct netinfo6, rip6_tag),
 107                                 sizeof(ni6.rip6_tag), "Tag: 0x%04x",
 108                                 g_ntohs(ni6.rip6_tag));
 109                     proto_tree_add_text(subtree, tvb,
 110                                 offset + offsetof(struct netinfo6, rip6_plen),
 111                                 sizeof(ni6.rip6_plen), "Prefix length: %u",
 112                                 ni6.rip6_plen);
 113                     proto_tree_add_text(subtree, tvb,
 114                                 offset + offsetof(struct netinfo6, rip6_metric),
 115                                 sizeof(ni6.rip6_metric), "Metric: %u",
 116                                 ni6.rip6_metric);
 117
 118                     offset += sizeof(ni6);
 119         }
 120     }
 121 }
 122
 123 void
 124 proto_register_ripng(void)
 125 {
 126     static hf_register_info hf[] = {
 127       { &hf_ripng_cmd,
 128         { "Command",            "ripng.cmd",
 129                                 FT_UINT8, BASE_DEC, VALS(cmdvals),
 130                                 0x0, NULL, HFILL }},
 131       { &hf_ripng_version,
 132         { "Version",            "ripng.version",
 133                                 FT_UINT8, BASE_DEC, NULL,
 134                                 0x0, NULL, HFILL }},
 135     };
 136     static gint *ett[] = {
 137       &ett_ripng,
 138       &ett_ripng_addr,
 139     };
 140
 141     proto_ripng = proto_register_protocol("RIPng", "RIPng", "ripng");
 142     proto_register_field_array(proto_ripng, hf, array_length(hf));
 143     proto_register_subtree_array(ett, array_length(ett));
 144 }
 145
 146 void
 147 proto_reg_handoff_ripng(void)
 148 {
 149     dissector_handle_t ripng_handle;
 150
 151     ripng_handle = create_dissector_handle(dissect_ripng, proto_ripng);
 152     dissector_add("udp.port", UDP_PORT_RIPNG, ripng_handle);
 153 }