epan/dissectors/packet-openthread.c

   1 /* packet-openthread.c
   2  * Simple dissector for OpenThread loopback interface
   3  *
   4  * Robert Cragie <robert.cragie@arm.com>
   5  *
   6  * Wireshark - Network traffic analyzer
   7  * By Gerald Combs <gerald@wireshark.org>
   8  * Copyright 1998 Gerald Combs
   9  *
  10  * SPDX-License-Identifier: GPL-2.0-or-later
  11  */
  12
  13 #include "config.h"
  14
  15 #include <epan/packet.h>
  16
  17 /* Forward declarations */
  18 void proto_register_openthread(void);
  19 void proto_reg_handoff_openthread(void);
  20
  21 static int proto_openthread;
  22
  23 static dissector_handle_t openthread_handle;
  24 static dissector_handle_t wpan_handle;
  25
  26 static int hf_openthread_channel;
  27 /* static int hf_openthread_psdu; */
  28
  29 static int ett_openthread;
  30
  31 static int
  32 dissect_openthread(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
  33 {
  34     proto_item  *proto_root;
  35     proto_tree  *openthread_tree;
  36     tvbuff_t    *sub_tvb;
  37
  38     /* Create the protocol tree. */
  39     proto_root = proto_tree_add_item(tree, proto_openthread, tvb, 0, -1, ENC_NA);
  40     openthread_tree = proto_item_add_subtree(proto_root, ett_openthread);
  41
  42     proto_tree_add_item(openthread_tree, hf_openthread_channel, tvb, 0, 1, ENC_NA);
  43     sub_tvb = tvb_new_subset_length(tvb, 1, tvb_reported_length_remaining(tvb, 3)); /* Note - truncate the last two "phoney" CRC bytes */
  44     call_dissector(wpan_handle, sub_tvb, pinfo, tree);
  45
  46     return tvb_captured_length(tvb);
  47 }
  48
  49 void
  50 proto_register_openthread(void)
  51 {
  52     static hf_register_info hf[] = {
  53
  54         /* Generic TLV */
  55         { &hf_openthread_channel,
  56             { "Channel",
  57             "openthread.channel",
  58             FT_UINT8, BASE_DEC, NULL, 0x0,
  59             NULL,
  60             HFILL }
  61         },
  62 #if 0
  63         { &hf_openthread_psdu,
  64             { "PSDU",
  65             "openthread.psdu",
  66             FT_NONE, BASE_NONE, NULL, 0x0,
  67             NULL,
  68             HFILL }
  69         }
  70 #endif
  71     };
  72
  73     static int *ett[] = {
  74         &ett_openthread
  75     };
  76
  77     proto_openthread = proto_register_protocol("OpenThread", "OpenThread", "openthread");
  78     proto_register_field_array(proto_openthread, hf, array_length(hf));
  79     proto_register_subtree_array(ett, array_length(ett));
  80     openthread_handle = register_dissector("openthread", dissect_openthread, proto_openthread);
  81 }
  82
  83 void
  84 proto_reg_handoff_openthread(void)
  85 {
  86     wpan_handle = find_dissector_add_dependency("wpan_nofcs", proto_openthread);
  87     dissector_add_for_decode_as("udp.port", openthread_handle);
  88 }
  89
  90 /*
  91  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
  92  *
  93  * Local variables:
  94  * c-basic-offset: 4
  95  * tab-width: 8
  96  * indent-tabs-mode: nil
  97  * End:
  98  *
  99  * vi: set shiftwidth=4 tabstop=8 expandtab:
 100  * :indentSize=4:tabSize=8:noTabs=true:
 101  */