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  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #include "config.h"
  13
  14 #include <epan/packet.h>
  15 #include <wsutil/str_util.h>
  16 #include "packet-pw-common.h"
  17
  18 void proto_register_pw_padding(void);
  19
  20 static const char string_ok[] = "Ok";
  21
  22 const value_string
  23 pwc_vals_cw_l_bit[] = {
  24         { 0x0,  string_ok },
  25         { 0x1,  "Attachment Circuit Fault" },
  26         { 0,    NULL }
  27 };
  28
  29
  30 const value_string
  31 pwc_vals_cw_r_bit[] = {
  32         { 0x0,  string_ok },
  33         { 0x1,  "Packet Loss State" },
  34         { 0,    NULL }
  35 };
  36
  37 const value_string
  38 pwc_vals_cw_frag[] = {
  39         { 0x0,  "Unfragmented" },
  40         { 0x1,  "First fragment" },
  41         { 0x2,  "Last fragment" },
  42         { 0x3,  "Intermediate fragment" },
  43         { 0,    NULL }
  44 };
  45
  46
  47 void pwc_item_append_cw(proto_item* item, const uint32_t cw, const bool append_text)
  48 {
  49         if (item != NULL)
  50         {
  51                 if (append_text)
  52                 {
  53                         proto_item_append_text(item, ", CW");
  54                 }
  55                 proto_item_append_text(item, ": 0x%.8" PRIx32, cw);
  56         }
  57         return;
  58 }
  59
  60
  61 void pwc_item_append_text_n_items(proto_item* item, const int n, const char * const item_text)
  62 {
  63         if (item != NULL)
  64         {
  65                 if (n >=0)
  66                 {
  67                         proto_item_append_text(item, ", %d %s%s", n, item_text, plurality(n,"","s"));
  68                 }
  69         }
  70         return;
  71 }
  72
  73
  74 static int proto_pw_padding;
  75 static int ett_pw_common;
  76 static int hf_padding_len;
  77
  78 static
  79 int dissect_pw_padding(tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
  80 {
  81         int size;
  82         proto_item* item;
  83         proto_tree* tree_p;
  84         size = tvb_reported_length_remaining(tvb, 0);
  85         item = proto_tree_add_item(tree, proto_pw_padding, tvb, 0, -1, ENC_NA);
  86         pwc_item_append_text_n_items(item,size,"byte");
  87         tree_p = proto_item_add_subtree(item, ett_pw_common);
  88
  89         call_data_dissector(tvb, pinfo, tree_p);
  90         item = proto_tree_add_int(tree_p, hf_padding_len, tvb, 0, 0, size);
  91         proto_item_set_hidden(item); /*allow filtering*/
  92
  93         return tvb_captured_length(tvb);
  94 }
  95
  96 void proto_register_pw_padding(void)
  97 {
  98         static hf_register_info hfpadding[] = {
  99                 {&hf_padding_len        ,{"Length"                      ,"pw.padding.len"
 100                                         ,FT_INT32       ,BASE_DEC       ,NULL           ,0
 101                                         ,NULL                                           ,HFILL }}
 102         };
 103         static int *ett_array[] = {
 104                 &ett_pw_common
 105         };
 106         proto_pw_padding = proto_register_protocol("Pseudowire Padding","PW Padding","pw.padding");
 107         proto_register_field_array(proto_pw_padding, hfpadding, array_length(hfpadding));
 108         proto_register_subtree_array(ett_array, array_length(ett_array));
 109         register_dissector("pw_padding", dissect_pw_padding, proto_pw_padding);
 110 }
 111
 112
 113 /*
 114  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 115  *
 116  * Local variables:
 117  * c-basic-offset: 8
 118  * tab-width: 8
 119  * indent-tabs-mode: t
 120  * End:
 121  *
 122  * vi: set shiftwidth=8 tabstop=8 noexpandtab:
 123  * :indentSize=8:tabSize=8:noTabs=false:
 124  */