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: packet-ripng.c,v 1.25 2002/01/24 09:20:51 guy Exp $
   7  *
   8  * Ethereal - Network traffic analyzer
   9  * By Gerald Combs <gerald@ethereal.com>
  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 #ifdef HAVE_SYS_TYPES_H
  30 #include <sys/types.h>
  31 #endif
  32
  33 #ifdef HAVE_NETINET_IN_H
  34 #include <netinet/in.h>
  35 #endif
  36
  37 #include <string.h>
  38 #include <glib.h>
  39 #include <epan/packet.h>
  40 #include "packet-ripng.h"
  41
  42 #ifndef offsetof
  43 #define offsetof(type, member)  ((size_t)(&((type *)0)->member))
  44 #endif
  45
  46 static int proto_ripng = -1;
  47 static int hf_ripng_cmd = -1;
  48 static int hf_ripng_version = -1;
  49
  50 static gint ett_ripng = -1;
  51 static gint ett_ripng_addr = -1;
  52
  53 #define UDP_PORT_RIPNG  521
  54
  55 static const value_string cmdvals[] = {
  56     { RIP6_REQUEST, "Request" },
  57     { RIP6_RESPONSE, "Response" },
  58     { 0, NULL },
  59 };
  60
  61 static void
  62 dissect_ripng(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) {
  63     int offset = 0;
  64     struct rip6 rip6;
  65     struct netinfo6 ni6;
  66     proto_tree *ripng_tree = NULL;
  67     proto_tree *subtree = NULL;
  68     proto_item *ti;
  69
  70     if (check_col(pinfo->cinfo, COL_PROTOCOL))
  71         col_set_str(pinfo->cinfo, COL_PROTOCOL, "RIPng");
  72     if (check_col(pinfo->cinfo, COL_INFO))
  73         col_clear(pinfo->cinfo, COL_INFO);
  74
  75     /* avoid alignment problem */
  76     tvb_memcpy(tvb, (guint8 *)&rip6, offset, sizeof(rip6));
  77
  78     if (check_col(pinfo->cinfo, COL_PROTOCOL))
  79         col_add_fstr(pinfo->cinfo, COL_PROTOCOL, "RIPng version %u", rip6.rip6_vers);
  80     if (check_col(pinfo->cinfo, COL_INFO))
  81         col_add_str(pinfo->cinfo, COL_INFO,
  82             val_to_str(rip6.rip6_cmd, cmdvals, "Unknown command (%u)"));
  83
  84     if (tree) {
  85         ti = proto_tree_add_item(tree, proto_ripng, tvb, offset, -1, FALSE);
  86         ripng_tree = proto_item_add_subtree(ti, ett_ripng);
  87
  88         proto_tree_add_uint(ripng_tree, hf_ripng_cmd, tvb, offset, 1,
  89             rip6.rip6_cmd);
  90         proto_tree_add_uint(ripng_tree, hf_ripng_version, tvb, offset + 1, 1,
  91             rip6.rip6_vers);
  92
  93         offset += 4;
  94         while (tvb_reported_length_remaining(tvb, offset) > 0) {
  95                     tvb_memcpy(tvb, (guint8 *)&ni6, offset, sizeof(ni6));
  96                     if (ni6.rip6_tag) {
  97                         ti = proto_tree_add_text(ripng_tree, tvb, offset,
  98                                         sizeof(ni6), "IP Address: %s/%u, Metric: %u, tag: 0x%04x",
  99                                         ip6_to_str(&ni6.rip6_dest),
 100                                         ni6.rip6_plen,
 101                                         ni6.rip6_metric,
 102                                         ntohs(ni6.rip6_tag));
 103                     } else {
 104                         ti = proto_tree_add_text(ripng_tree, tvb, offset,
 105                                         sizeof(ni6), "IP Address: %s/%u, Metric: %u",
 106                                         ip6_to_str(&ni6.rip6_dest),
 107                                         ni6.rip6_plen,
 108                                         ni6.rip6_metric);
 109                     }
 110                     subtree = proto_item_add_subtree(ti, ett_ripng_addr);
 111                     proto_tree_add_text(subtree, tvb,
 112                                 offset + offsetof(struct netinfo6, rip6_dest),
 113                                 sizeof(ni6.rip6_dest), "IP Address: %s",
 114                                 ip6_to_str(&ni6.rip6_dest));
 115                     proto_tree_add_text(subtree, tvb,
 116                                 offset + offsetof(struct netinfo6, rip6_tag),
 117                                 sizeof(ni6.rip6_tag), "Tag: 0x%04x",
 118                                 ntohs(ni6.rip6_tag));
 119                     proto_tree_add_text(subtree, tvb,
 120                                 offset + offsetof(struct netinfo6, rip6_plen),
 121                                 sizeof(ni6.rip6_plen), "Prefix length: %u",
 122                                 ni6.rip6_plen);
 123                     proto_tree_add_text(subtree, tvb,
 124                                 offset + offsetof(struct netinfo6, rip6_metric),
 125                                 sizeof(ni6.rip6_metric), "Metric: %u",
 126                                 ni6.rip6_metric);
 127
 128                     offset += sizeof(ni6);
 129         }
 130     }
 131 }
 132
 133 void
 134 proto_register_ripng(void)
 135 {
 136     static hf_register_info hf[] = {
 137       { &hf_ripng_cmd,
 138         { "Command",            "ripng.cmd",
 139                                 FT_UINT8, BASE_DEC, VALS(cmdvals),
 140                                 0x0, "", HFILL }},
 141       { &hf_ripng_version,
 142         { "Version",            "ripng.version",
 143                                 FT_UINT8, BASE_DEC, NULL,
 144                                 0x0, "", HFILL }},
 145     };
 146     static gint *ett[] = {
 147       &ett_ripng,
 148       &ett_ripng_addr,
 149     };
 150
 151     proto_ripng = proto_register_protocol("RIPng", "RIPng", "ripng");
 152     proto_register_field_array(proto_ripng, hf, array_length(hf));
 153     proto_register_subtree_array(ett, array_length(ett));
 154 }
 155
 156 void
 157 proto_reg_handoff_ripng(void)
 158 {
 159     dissector_handle_t ripng_handle;
 160
 161     ripng_handle = create_dissector_handle(dissect_ripng, proto_ripng);
 162     dissector_add("udp.port", UDP_PORT_RIPNG, ripng_handle);
 163 }