epan/dissectors/packet-atmtcp.c

   1 /* packet-atmtcp.c
   2  * Routines for ATM over TCP dissection
   3  * Copyright 2011, Alexis La Goutte <alexis.lagoutte at gmail dot 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 /* Specification...
  13  * http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=blob;f=include/linux/atm_tcp.h;hb=HEAD
  14  * http://git.kernel.org/?p=linux/kernel/git/next/linux-next.git;a=blob;f=drivers/atm/atmtcp.c;hb=HEAD
  15  */
  16
  17 #include "config.h"
  18
  19 #include <epan/packet.h>
  20
  21 void proto_register_atmtcp(void);
  22 void proto_reg_handoff_atmtcp(void);
  23
  24 static dissector_handle_t atmtcp_handle;
  25
  26 static int proto_atmtcp;
  27 static int hf_atmtcp_vpi;
  28 static int hf_atmtcp_vci;
  29 static int hf_atmtcp_length;
  30
  31 #define ATMTCP_TCP_PORT     2812
  32
  33 static int ett_atmtcp;
  34
  35 #define ATMTCP_HDR_MAGIC        (~0)    /* this length indicates a command */
  36 #define ATMTCP_CTRL_OPEN        1       /* request/reply */
  37 #define ATMTCP_CTRL_CLOSE       2       /* request/reply */
  38
  39 static int
  40 dissect_atmtcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
  41 {
  42
  43     proto_item *ti;
  44     proto_tree *atmtcp_tree;
  45     unsigned    offset = 0;
  46     int32_t     length;
  47     tvbuff_t   *next_tvb;
  48
  49     col_set_str(pinfo->cinfo, COL_PROTOCOL, "ATMTCP");
  50
  51     col_set_str(pinfo->cinfo, COL_INFO, "ATMTCP");
  52
  53     if (tree) {
  54         ti = proto_tree_add_item(tree, proto_atmtcp, tvb, 0, -1, ENC_NA);
  55
  56         atmtcp_tree = proto_item_add_subtree(ti, ett_atmtcp);
  57
  58         /* VPI */
  59         proto_tree_add_item(atmtcp_tree, hf_atmtcp_vpi, tvb, offset, 2, ENC_BIG_ENDIAN);
  60     }
  61     offset += 2;
  62
  63
  64     if (tree) {
  65         /* VCI */
  66         proto_tree_add_item(atmtcp_tree, hf_atmtcp_vci, tvb, offset, 2, ENC_BIG_ENDIAN);
  67     }
  68     offset += 2;
  69
  70
  71     if (tree) {
  72         /* Length  */
  73         proto_tree_add_item(atmtcp_tree, hf_atmtcp_length, tvb, offset, 4, ENC_BIG_ENDIAN);
  74     }
  75     length = tvb_get_ntohl(tvb, offset);
  76     if(length == ATMTCP_HDR_MAGIC)
  77     {
  78         col_append_str(pinfo->cinfo, COL_INFO, " Command");
  79     }
  80     else
  81     {
  82         col_append_str(pinfo->cinfo, COL_INFO, " Data");
  83     }
  84     offset += 4;
  85
  86     /* Data (for the moment...) */
  87     next_tvb = tvb_new_subset_remaining(tvb, offset);
  88     call_data_dissector(next_tvb, pinfo, tree);
  89     return tvb_reported_length(tvb);
  90 }
  91
  92
  93 void
  94 proto_register_atmtcp(void)
  95 {
  96     static hf_register_info hf[] = {
  97         { &hf_atmtcp_vpi,
  98             { "VPI",           "atmtcp.vpi", FT_UINT16, BASE_DEC, NULL, 0x0,
  99               "Virtual Path Identifier", HFILL }
 100         },
 101         { &hf_atmtcp_vci,
 102             { "VCI",           "atmtcp.vci", FT_UINT16, BASE_DEC, NULL, 0x0,
 103               "Virtual Channel Identifier", HFILL }
 104         },
 105         { &hf_atmtcp_length,
 106             { "Length",        "atmtcp.length", FT_UINT32, BASE_DEC, NULL, 0x0,
 107               "length of data", HFILL }
 108         }
 109     };
 110
 111
 112     static int *ett[] = {
 113         &ett_atmtcp
 114     };
 115
 116
 117     proto_atmtcp = proto_register_protocol("ATM over TCP", "ATMTCP", "atmtcp");
 118
 119     proto_register_field_array(proto_atmtcp, hf, array_length(hf));
 120     proto_register_subtree_array(ett, array_length(ett));
 121
 122     atmtcp_handle = register_dissector("atm.tcp", dissect_atmtcp, proto_atmtcp);
 123 }
 124
 125
 126 void
 127 proto_reg_handoff_atmtcp(void)
 128 {
 129     dissector_add_uint_with_preference("tcp.port", ATMTCP_TCP_PORT, atmtcp_handle);
 130 }
 131
 132 /*
 133  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 134  *
 135  * Local variables:
 136  * c-basic-offset: 4
 137  * tab-width: 8
 138  * indent-tabs-mode: nil
 139  * End:
 140  *
 141  * vi: set shiftwidth=4 tabstop=8 expandtab:
 142  * :indentSize=4:tabSize=8:noTabs=true:
 143  */