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 1.17 2001/01/09 06:31:40 guy Exp $
   7  *
   8  * Ethereal - Network traffic analyzer
   9  * By Gerald Combs <gerald@zing.org>
  10  * Copyright 1998 Gerald Combs
  11  *
  12  *
  13  * This program is free software; you can redistribute it and/or
  14  * modify it under the terms of the GNU General Public License
  15  * as published by the Free Software Foundation; either version 2
  16  * of the License, or (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  26  */
  27
  28 #include "config.h"
  29
  30 #ifdef HAVE_SYS_TYPES_H
  31 #include <sys/types.h>
  32 #endif
  33
  34 #ifdef HAVE_NETINET_IN_H
  35 #include <netinet/in.h>
  36 #endif
  37
  38 #include <string.h>
  39 #include <glib.h>
  40 #include "packet.h"
  41 #include "packet-ipv6.h"
  42 #include "packet-ripng.h"
  43
  44 #ifndef offsetof
  45 #define offsetof(type, member)  ((size_t)(&((type *)0)->member))
  46 #endif
  47
  48 static int proto_ripng = -1;
  49 static int hf_ripng_cmd = -1;
  50 static int hf_ripng_version = -1;
  51
  52 static gint ett_ripng = -1;
  53 static gint ett_ripng_addr = -1;
  54
  55 #define UDP_PORT_RIPNG  521
  56
  57 static void
  58 dissect_ripng(const u_char *pd, int offset, frame_data *fd, proto_tree *tree) {
  59     struct rip6 rip6;
  60     struct netinfo6 ni6;
  61     proto_tree *ripng_tree = NULL;
  62     proto_tree *subtree = NULL;
  63     proto_item *ti;
  64     static const value_string cmdvals[] = {
  65         { RIP6_REQUEST, "Request" },
  66         { RIP6_RESPONSE, "Response" },
  67         { 0, NULL },
  68     };
  69     const char *cmd;
  70
  71     OLD_CHECK_DISPLAY_AS_DATA(proto_ripng, pd, offset, fd, tree);
  72
  73     /* avoid alignment problem */
  74     memcpy(&rip6, &pd[offset], sizeof(rip6));
  75
  76     cmd = val_to_str(rip6.rip6_cmd, cmdvals, "Unknown");
  77
  78     if (check_col(fd, COL_PROTOCOL))
  79         col_add_fstr(fd, COL_PROTOCOL, "RIPng version %u", rip6.rip6_vers);
  80     if (check_col(fd, COL_INFO))
  81         col_add_fstr(fd, COL_INFO, "%s", cmd);
  82
  83     if (tree) {
  84         ti = proto_tree_add_item(tree, proto_ripng, NullTVB, offset, END_OF_FRAME, FALSE);
  85         ripng_tree = proto_item_add_subtree(ti, ett_ripng);
  86
  87         proto_tree_add_uint_format(ripng_tree, hf_ripng_cmd, NullTVB, offset, 1,
  88             rip6.rip6_cmd,
  89             "Command: %s (%u)", cmd, rip6.rip6_cmd);
  90         proto_tree_add_uint(ripng_tree, hf_ripng_version, NullTVB, offset + 1, 1,
  91             rip6.rip6_vers);
  92
  93         offset += 4;
  94         while ((pi.captured_len - offset) >= sizeof(struct netinfo6)){
  95                     if (! BYTES_ARE_IN_FRAME(offset, sizeof(ni6))) {
  96                        proto_tree_add_text(ripng_tree, NullTVB, offset, sizeof(ni6), "No IP Address information");
  97                        break;
  98                     }
  99
 100                     memcpy(&ni6, &pd[offset], sizeof(ni6));
 101                     if (ni6.rip6_tag) {
 102                         ti = proto_tree_add_text(ripng_tree, NullTVB, offset,
 103                                         sizeof(ni6), "IP Address: %s/%u, Metric: %u, tag: 0x%04x",
 104                                         ip6_to_str(&ni6.rip6_dest),
 105                                         ni6.rip6_plen,
 106                                         ni6.rip6_metric,
 107                                         ntohs(ni6.rip6_tag));
 108                     } else {
 109                         ti = proto_tree_add_text(ripng_tree, NullTVB, offset,
 110                                         sizeof(ni6), "IP Address: %s/%u, Metric: %u",
 111                                         ip6_to_str(&ni6.rip6_dest),
 112                                         ni6.rip6_plen,
 113                                         ni6.rip6_metric);
 114                     }
 115                     subtree = proto_item_add_subtree(ti, ett_ripng_addr);
 116                     proto_tree_add_text(subtree, NullTVB,
 117                                 offset + offsetof(struct netinfo6, rip6_dest),
 118                                 sizeof(ni6.rip6_dest), "IP Address: %s",
 119                                 ip6_to_str(&ni6.rip6_dest));
 120                     proto_tree_add_text(subtree, NullTVB,
 121                                 offset + offsetof(struct netinfo6, rip6_tag),
 122                                 sizeof(ni6.rip6_tag), "Tag: 0x%04x",
 123                                 ntohs(ni6.rip6_tag));
 124                     proto_tree_add_text(subtree, NullTVB,
 125                                 offset + offsetof(struct netinfo6, rip6_plen),
 126                                 sizeof(ni6.rip6_plen), "Prefix length: %u",
 127                                 ni6.rip6_plen);
 128                     proto_tree_add_text(subtree, NullTVB,
 129                                 offset + offsetof(struct netinfo6, rip6_metric),
 130                                 sizeof(ni6.rip6_metric), "Metric: %u",
 131                                 ni6.rip6_metric);
 132
 133                     offset += sizeof(ni6);
 134         }
 135     }
 136 }
 137
 138 void
 139 proto_register_ripng(void)
 140 {
 141     static hf_register_info hf[] = {
 142       { &hf_ripng_cmd,
 143         { "Command",            "ripng.cmd",
 144                                 FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
 145       { &hf_ripng_version,
 146         { "Version",            "ripng.version",
 147                                 FT_UINT8, BASE_DEC, NULL, 0x0, "" }},
 148     };
 149     static gint *ett[] = {
 150       &ett_ripng,
 151       &ett_ripng_addr,
 152     };
 153
 154     proto_ripng = proto_register_protocol("RIPng", "RIPng", "ripng");
 155     proto_register_field_array(proto_ripng, hf, array_length(hf));
 156     proto_register_subtree_array(ett, array_length(ett));
 157 }
 158
 159 void
 160 proto_reg_handoff_ripng(void)
 161 {
 162     old_dissector_add("udp.port", UDP_PORT_RIPNG, dissect_ripng, proto_ripng);
 163 }