epan/dissectors/packet-pw-common.c

   1 /* packet-pw-common.c
   2  * Common functions and objects for PWE3 dissectors.
   3  * Copyright 2009, Artem Tamazov <artem.tamazov@tellabs.com>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <epan/packet.h>
  29 #include "packet-pw-common.h"
  30
  31 static const char string_ok[] = "Ok";
  32
  33 const value_string
  34 pwc_vals_cw_l_bit[] = {
  35         { 0x0,  string_ok },
  36         { 0x1,  "Attachment Circuit Fault" },
  37         { 0,    NULL }
  38 };
  39
  40
  41 const value_string
  42 pwc_vals_cw_r_bit[] = {
  43         { 0x0,  string_ok },
  44         { 0x1,  "Packet Loss State" },
  45         { 0,    NULL }
  46 };
  47
  48 const value_string
  49 pwc_vals_cw_frag[] = {
  50         { 0x0,  "Unfragmented" },
  51         { 0x1,  "First fragment" },
  52         { 0x2,  "Last fragment" },
  53         { 0x3,  "Intermediate fragment" },
  54         { 0,    NULL }
  55 };
  56
  57
  58 void pwc_item_append_cw(proto_item* item, const guint32 cw, const gboolean append_text)
  59 {
  60         if (item != NULL)
  61         {
  62                 if (append_text)
  63                 {
  64                         proto_item_append_text(item, ", CW");
  65                 }
  66                 proto_item_append_text(item, ": 0x%.8" G_GINT32_MODIFIER "x", cw);
  67         }
  68         return;
  69 }
  70
  71
  72 void pwc_item_append_text_n_items(proto_item* item, const int n, const char * const item_text)
  73 {
  74         if (item != NULL)
  75         {
  76                 if (n >=0)
  77                 {
  78                         proto_item_append_text(item, ", %d %s%s", n, item_text, plurality(n,"","s"));
  79                 }
  80         }
  81         return;
  82 }
  83
  84
  85 static gint proto_pw_padding = -1;
  86 static gint ett = -1;
  87 static int hf_padding_len = -1;
  88 static dissector_handle_t dh_data;
  89
  90 static
  91 void dissect_pw_padding(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree)
  92 {
  93         /* do not touch columns */
  94         if (tree)
  95         {
  96                 gint size;
  97                 proto_item* item;
  98                 size = tvb_reported_length_remaining(tvb, 0);
  99                 item = proto_tree_add_item(tree, proto_pw_padding, tvb, 0, -1, ENC_NA);
 100                 pwc_item_append_text_n_items(item,size,"byte");
 101                 {
 102                         proto_tree* tree_p;
 103                         tree_p = proto_item_add_subtree(item, ett);
 104                         call_dissector(dh_data, tvb, pinfo, tree_p);
 105                         item = proto_tree_add_int(tree_p, hf_padding_len, tvb, 0, 0, size);
 106                         PROTO_ITEM_SET_HIDDEN(item); /*allow filtering*/
 107                 }
 108         }
 109         return;
 110 }
 111
 112 void proto_register_pw_padding(void)
 113 {
 114         static hf_register_info hfpadding[] = {
 115                 {&hf_padding_len        ,{"Length"                      ,"pw.padding.len"
 116                                         ,FT_INT32       ,BASE_DEC       ,NULL           ,0
 117                                         ,NULL                                           ,HFILL }}
 118         };
 119         static gint *ett_array[] = {
 120                 &ett
 121         };
 122         proto_pw_padding = proto_register_protocol("Pseudowire Padding","PW Padding","pwpadding");
 123         proto_register_field_array(proto_pw_padding, hfpadding, array_length(hfpadding));
 124         proto_register_subtree_array(ett_array, array_length(ett_array));
 125         register_dissector("pw_padding", dissect_pw_padding, proto_pw_padding);
 126         return;
 127 }
 128
 129
 130 void proto_reg_handoff_pw_padding(void)
 131 {
 132         dh_data = find_dissector("data");
 133         return;
 134 }