epan/dissectors/packet-ipfc.c

   1 /* packet-ipfc.c
   2  * Routines for Decoding Network_Header for IP-over-FC when we only
   3  * capture the frame starting at the Network_Header (as opposed to
   4  * when we have the full FC frame).
   5  * See RFC 2625.
   6  * Copyright 2001, Dinesh G Dutt <ddutt@cisco.com>
   7  *
   8  * $Id$
   9  *
  10  * Wireshark - Network traffic analyzer
  11  * By Gerald Combs <gerald@wireshark.org>
  12  * Copyright 1998 Gerald Combs
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, write to the Free Software
  26  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  27  */
  28
  29 #include "config.h"
  30
  31 #include <glib.h>
  32
  33 #include <epan/packet.h>
  34 #include <epan/to_str.h>
  35 #include <epan/etypes.h>
  36 #include <epan/conversation.h>
  37 #include "packet-scsi.h"
  38 #include "packet-fc.h"
  39 #include "packet-ipfc.h"
  40 #include "packet-llc.h"
  41
  42 /* Initialize the protocol and registered fields */
  43 static int proto_ipfc              = -1;
  44 static int hf_ipfc_network_da = -1;
  45 static int hf_ipfc_network_sa = -1;
  46
  47 /* Initialize the subtree pointers */
  48 static gint ett_ipfc = -1;
  49 static dissector_handle_t llc_handle;
  50
  51 void
  52 capture_ipfc (const guchar *pd, int len, packet_counts *ld)
  53 {
  54   if (!BYTES_ARE_IN_FRAME(0, len, 16)) {
  55     ld->other++;
  56     return;
  57   }
  58
  59   capture_llc(pd, 16, len, ld);
  60 }
  61
  62 static void
  63 dissect_ipfc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  64 {
  65
  66 /* Set up structures needed to add the protocol subtree and manage it */
  67     proto_item *ti;
  68     proto_tree *ipfc_tree;
  69     int offset = 0;
  70     tvbuff_t *next_tvb;
  71
  72     /* Make entries in Protocol column and Info column on summary display */
  73     col_set_str(pinfo->cinfo, COL_PROTOCOL, "IP/FC");
  74
  75     if (tree) {
  76         ti = proto_tree_add_protocol_format (tree, proto_ipfc, tvb, offset, 16,
  77                                          "IP Over FC Network_Header");
  78         ipfc_tree = proto_item_add_subtree (ti, ett_ipfc);
  79
  80         proto_tree_add_string (ipfc_tree, hf_ipfc_network_da, tvb, offset, 8,
  81                                tvb_fcwwn_to_str (tvb, offset));
  82         proto_tree_add_string (ipfc_tree, hf_ipfc_network_sa, tvb, offset+8, 8,
  83                                tvb_fcwwn_to_str (tvb, offset+8));
  84     }
  85
  86     next_tvb = tvb_new_subset_remaining (tvb, 16);
  87     call_dissector(llc_handle, next_tvb, pinfo, tree);
  88 }
  89
  90 /* Register the protocol with Wireshark */
  91
  92 /* this format is require because a script is used to build the C function
  93    that calls all the protocol registration.
  94 */
  95
  96 void
  97 proto_register_ipfc (void)
  98 {
  99
 100 /* Setup list of header fields  See Section 1.6.1 for details*/
 101     static hf_register_info hf[] = {
 102         { &hf_ipfc_network_da,
 103           {"Network DA", "ipfc.nh.da", FT_STRING, BASE_NONE, NULL,
 104            0x0, NULL, HFILL}},
 105         { &hf_ipfc_network_sa,
 106           {"Network SA", "ipfc.nh.sa", FT_STRING, BASE_NONE, NULL,
 107            0x0, NULL, HFILL}},
 108     };
 109
 110     /* Setup protocol subtree array */
 111     static gint *ett[] = {
 112         &ett_ipfc,
 113     };
 114
 115     /* Register the protocol name and description */
 116     proto_ipfc = proto_register_protocol("IP Over FC", "IPFC", "ipfc");
 117
 118     /* Required function calls to register the header fields and subtrees used */
 119     proto_register_field_array(proto_ipfc, hf, array_length(hf));
 120     proto_register_subtree_array(ett, array_length(ett));
 121 }
 122
 123 /* If this dissector uses sub-dissector registration add a registration routine.
 124    This format is required because a script is used to find these routines and
 125    create the code that calls these routines.
 126 */
 127 void
 128 proto_reg_handoff_ipfc (void)
 129 {
 130     dissector_handle_t ipfc_handle;
 131
 132     ipfc_handle = create_dissector_handle (dissect_ipfc, proto_ipfc);
 133     dissector_add_uint("wtap_encap", WTAP_ENCAP_IP_OVER_FC, ipfc_handle);
 134
 135     llc_handle = find_dissector ("llc");
 136 }