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wireshark/epan/dissectors/packet-dsr.c
Michael Mann 1e60d63c8c Create call_data_dissector() to call data dissector. 
This saves many dissectors the need to find the data dissector and store a handle to it.

There were also some that were finding it, but not using it.
For others this was the only reason for their handoff function, so it could be eliminated.

Change-Id: I5d3f951ee1daa3d30c060d21bd12bbc881a8027b
Reviewed-on: https://code.wireshark.org/review/14530
Petri-Dish: Michael Mann <mmann78@netscape.net>
Reviewed-by: Michael Mann <mmann78@netscape.net>
2016-03-20 17:38:03 +00:00

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/* packet-dsr.c
* Routines for DSR dissection
* Copyright 2014, ENAC - Gilles Roudiere <gilles.roudiere@enac.fr or gilles@roudiere.net>
* ENAC's URL : http://www.enac.fr/
* Mail to : gilles.roudiere@enac.fr or nicolas.larrieu@enac.fr
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/ipproto.h>
#include <epan/addr_resolv.h>
/* Please refer to rfc4728 for DSR protocol specifications */
/* Forward declaration that is needed below if using the
* proto_reg_handoff_dsr function as a callback for when protocol
* preferences get changed. */
void proto_reg_handoff_dsr(void);
void proto_register_dsr(void);
static dissector_table_t ip_dissector_table;
/* Initialize the protocol and registered fields */
static int proto_dsr = -1;
/* DSR global fields */
static int hf_dsr_nexthdr = -1;
static int hf_dsr_flowstate = -1;
static int hf_dsr_reserved = -1;
static int hf_dsr_length = -1;
static int hf_dsr_opttype = -1;
static int hf_dsr_optlen = -1;
static int hf_dsr_fs_hopcount = -1;
static int hf_dsr_fs_id = -1;
/* RREQ option fields */
static int hf_dsr_opt_rreq_id = -1;
static int hf_dsr_opt_rreq_targetaddress = -1;
static int hf_dsr_opt_rreq_address = -1;
/* RREP option fields */
static int hf_dsr_opt_rrep_lasthopex = -1;
static int hf_dsr_opt_rrep_reserved = -1;
static int hf_dsr_opt_rrep_address = -1;
/* RERR option fields */
static int hf_dsr_opt_err_type = -1;
static int hf_dsr_opt_err_reserved = -1;
static int hf_dsr_opt_err_salvage = -1;
static int hf_dsr_opt_err_src = -1;
static int hf_dsr_opt_err_dest = -1;
static int hf_dsr_opt_err_unreach_addr = -1;
static int hf_dsr_opt_err_unsupportedoption = -1;
static int hf_dsr_opt_err_unknownflow_dest = -1;
static int hf_dsr_opt_err_unknownflow_id = -1;
static int hf_dsr_opt_err_defaultflowunknown_dest = -1;
/* ACK REQuest option fields */
static int hf_dsr_opt_ack_req_id = -1;
static int hf_dsr_opt_ack_req_address = -1;
/* ACK option fields */
static int hf_dsr_opt_ack_id = -1;
static int hf_dsr_opt_ack_src = -1;
static int hf_dsr_opt_ack_dest = -1;
/* SRCRT option fields */
static int hf_dsr_opt_srcrt_firsthopext = -1;
static int hf_dsr_opt_srcrt_lasthopext = -1;
static int hf_dsr_opt_srcrt_reserved = -1;
static int hf_dsr_opt_srcrt_salvage = -1;
static int hf_dsr_opt_srcrt_segsleft = -1;
static int hf_dsr_opt_srcrt_address = -1;
/* Flow State Extentions */
/* Timout option fields */
static int hf_dsr_fs_opt_timeout_timeout = -1;
/* Flow ID / destination option fields */
static int hf_dsr_fs_opt_destflowid_id = -1;
static int hf_dsr_fs_opt_destflowid_dest = -1;
/* Initialize the subtree pointers */
static gint ett_dsr = -1;
/* DSR options tree */
static gint ett_dsr_options = -1;
static gint ett_dsr_rreq_opt = -1;
static gint ett_dsr_rrep_opt = -1;
static gint ett_dsr_rerr_opt = -1;
static gint ett_dsr_ackreq_opt = -1;
static gint ett_dsr_ack_opt = -1;
static gint ett_dsr_srcrt_opt = -1;
static gint ett_dsr_padn_opt = -1;
static gint ett_dsr_pad1_opt = -1;
static gint ett_dsr_fs_timeout_opt = -1;
static gint ett_dsr_fs_destflowid_opt = -1;
/* hoplist trees */
static gint ett_dsr_rreq_hoplist = -1;
static gint ett_dsr_rrep_hoplist = -1;
static gint ett_dsr_srcrt_hoplist = -1;
/* A sample #define of the minimum length (in bytes) of the protocol data.
* If data is received with fewer than this many bytes it is rejected by
* the current dissector. */
#define DSR_MIN_LENGTH 4
/* DSR option types */
#define DSR_OPT_TYPE_RREQ 1
#define DSR_OPT_TYPE_RREP 2
#define DSR_OPT_TYPE_RERR 3
#define DSR_OPT_TYPE_ACKREQ 160
#define DSR_OPT_TYPE_ACK 32
#define DSR_OPT_TYPE_SRCRT 96
#define DSR_OPT_TYPE_PAD1 224
#define DSR_OPT_TYPE_PADN 0
/* DSR Flow State extention types */
#define DSR_FS_OPT_TYPE_TIMEOUT 128
#define DSR_FS_OPT_TYPE_DESTFLOWID 129
/* Route error types */
#define DSR_RERR_TYPE_UNREACHABLE 1
#define DSR_RERR_TYPE_FLOWSTATENOTSUPPORTED 2
#define DSR_RERR_TYPE_OPTIONNOTSUPPORTED 3
#define DSR_RERR_TYPE_UNKNOWNFLOW 129
#define DSR_RERR_TYPE_DEFAULTFLOWUNKNOWN 130
/* DSR option names */
static const value_string dsropttypenames[] ={
{DSR_OPT_TYPE_RREQ, "Route request"},
{DSR_OPT_TYPE_RREP, "Route reply"},
{DSR_OPT_TYPE_RERR, "Route error"},
{DSR_OPT_TYPE_ACKREQ, "Acknowledgement request"},
{DSR_OPT_TYPE_ACK, "Acknowledgement"},
{DSR_OPT_TYPE_SRCRT, "Source route"},
{DSR_OPT_TYPE_PAD1, "Padding by 1"},
{DSR_OPT_TYPE_PADN, "Padding by N"},
{0, NULL}
};
/* DSR Route error names */
static const value_string dsrrerrtypenames[] ={
{DSR_RERR_TYPE_UNREACHABLE, "Unreachable node"},
{DSR_RERR_TYPE_FLOWSTATENOTSUPPORTED, "Flow state not supported"},
{DSR_RERR_TYPE_OPTIONNOTSUPPORTED, "Option not supported"},
{DSR_RERR_TYPE_UNKNOWNFLOW, "Unknown flow"},
{DSR_RERR_TYPE_UNKNOWNFLOW, "Default flow unknown"},
{0, NULL}
};
/* Code to actually dissect the packets */
static int
dissect_dsr(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
void *data _U_)
{
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti_main, *ti, *ti_hoplist;
proto_tree *dsr_tree, *opt_tree, *options_tree, *opt_hoplist_tree;
/* Other misc. local variables. */
guint offset = 0; /* Global offset in DSR packet */
guint offset_in_option = 0; /* Per-option offset */
guint nexthdr, opt_tot_len, opt_len, opt_type, opt_id, opt_err_type, flowstate_hdr;
guint i;
tvbuff_t *next_tvb;
/* Check that the packet is long enough for it to belong to us. */
if (tvb_reported_length(tvb) < DSR_MIN_LENGTH)
return 0;
/* Set the Protocol column to the constant string of dsr */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "DSR");
col_add_str(pinfo->cinfo, COL_INFO, "Options : ");
/* create display subtree for the protocol */
ti_main = proto_tree_add_item(tree, proto_dsr, tvb, 0, -1, ENC_NA);
dsr_tree = proto_item_add_subtree(ti_main, ett_dsr);
proto_tree_add_item(dsr_tree, hf_dsr_nexthdr, tvb, offset, 1, ENC_BIG_ENDIAN); /* Next header */
nexthdr = tvb_get_guint8(tvb, offset);
offset += 1;
proto_tree_add_item(dsr_tree, hf_dsr_flowstate, tvb, offset, 1, ENC_BIG_ENDIAN); /* Flowstate */
flowstate_hdr = tvb_get_bits8(tvb, offset*8, 1);
/*DSR normal header*/
if (!flowstate_hdr) {
proto_tree_add_item(dsr_tree, hf_dsr_reserved, tvb, offset, 1, ENC_BIG_ENDIAN); /* Reserved */
offset += 1;
proto_tree_add_item(dsr_tree, hf_dsr_length, tvb, offset, 2, ENC_BIG_ENDIAN); /* Dsr opt tot length */
opt_tot_len = tvb_get_ntohs(tvb, offset);
proto_item_set_len(ti_main, opt_tot_len+4);
offset += 2;
options_tree = proto_tree_add_subtree(dsr_tree, tvb, offset, opt_tot_len, ett_dsr_options, NULL, "Options"); /* DSR options */
/* DSR options dissection */
while (offset - 4 < opt_tot_len) {
opt_type = tvb_get_guint8(tvb, offset);
offset_in_option = offset;
opt_len = 0;
switch(opt_type) {
case DSR_OPT_TYPE_RREQ:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_rreq_opt, &ti, "Route request"); /* Opt subtree */
col_append_str(pinfo->cinfo, COL_INFO, "Route request");
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option);
proto_item_set_len(ti, opt_len+2);
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_opt_rreq_id, tvb, offset_in_option, 2, ENC_BIG_ENDIAN); /* Opt rreq id */
opt_id = tvb_get_ntohs(tvb, offset_in_option);
col_append_fstr(pinfo->cinfo, COL_INFO, " (id=0x%x)", opt_id);
offset_in_option += 2;
proto_tree_add_item(opt_tree, hf_dsr_opt_rreq_targetaddress, tvb, offset_in_option, 4, ENC_NA); /* Opt rreq target address */
offset_in_option += 4;
if(opt_len > 6) {
opt_hoplist_tree = proto_tree_add_subtree(opt_tree, tvb, offset_in_option, 1, ett_dsr_rreq_hoplist, &ti_hoplist, "Hop list" ); /* Opt hop list */
proto_item_append_text(ti_hoplist, " :");
for(i=0;i<(opt_len-4)/4;i++) {
proto_tree_add_item(opt_hoplist_tree, hf_dsr_opt_rreq_address, tvb, offset_in_option, 4, ENC_NA); /* Opt rreq address */
proto_item_append_text(ti_hoplist, " %s", tvb_ip_to_str(tvb, offset_in_option));
offset_in_option += 4;
}
}
break;
case DSR_OPT_TYPE_RREP:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_rrep_opt, &ti, "Route reply"); /* Opt subtree */
col_append_str(pinfo->cinfo, COL_INFO, "Route reply");
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option);
proto_item_set_len(ti, opt_len+2);
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_opt_rrep_lasthopex, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt rrep reserved */
proto_tree_add_item(opt_tree, hf_dsr_opt_rrep_reserved, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt rrep reserved */
offset_in_option += 1;
if(opt_len > 2) {
opt_hoplist_tree = proto_tree_add_subtree(opt_tree, tvb, offset_in_option, 1, ett_dsr_rrep_hoplist, &ti_hoplist, "Hop list" ); /* Opt hop list */
proto_item_append_text(ti_hoplist, " :");
for(i=0;i<(opt_len-1)/4;i++) {
proto_tree_add_item(opt_hoplist_tree, hf_dsr_opt_rrep_address, tvb, offset_in_option, 4, ENC_NA); /*Opt rrep address */
proto_item_append_text(ti_hoplist, " %s", tvb_ip_to_str(tvb, offset_in_option));
offset_in_option += 4;
}
}
break;
case DSR_OPT_TYPE_RERR:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_rerr_opt, &ti, "Route error"); /* Opt subtree */
col_append_str(pinfo->cinfo, COL_INFO, "Route error");
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option);
proto_item_set_len(ti, opt_len+2);
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_opt_err_type, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt err type */
opt_err_type = tvb_get_guint8(tvb, offset_in_option);
offset_in_option += 1;
proto_tree_add_bits_item(opt_tree, hf_dsr_opt_err_reserved, tvb, offset_in_option*8, 4, ENC_BIG_ENDIAN); /*Opt err reserved */
proto_tree_add_bits_item(opt_tree, hf_dsr_opt_err_salvage, tvb, offset_in_option*8+4, 4, ENC_BIG_ENDIAN); /*Opt err salvage */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_opt_err_src, tvb, offset_in_option, 4, ENC_NA); /*Opt err source address */
offset_in_option += 4;
proto_tree_add_item(opt_tree, hf_dsr_opt_err_dest, tvb, offset_in_option, 4, ENC_NA); /* Opt err dest address */
offset_in_option += 4;
switch(opt_err_type) {
case DSR_RERR_TYPE_UNREACHABLE:
proto_tree_add_item(opt_tree, hf_dsr_opt_err_unreach_addr, tvb, offset_in_option, 4, ENC_NA); /* Opt err unreachable node address */
/*offset_in_option += 4;*/
break;
case DSR_RERR_TYPE_FLOWSTATENOTSUPPORTED:
break;
case DSR_RERR_TYPE_OPTIONNOTSUPPORTED:
proto_tree_add_item(opt_tree, hf_dsr_opt_err_unsupportedoption, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt err unsupported opt */
/*offset_in_option += 1;*/
break;
case DSR_RERR_TYPE_UNKNOWNFLOW:
proto_tree_add_item(opt_tree, hf_dsr_opt_err_unknownflow_dest, tvb, offset_in_option, 4, ENC_NA);/* Opt err unknown flow original ip destination address */
offset_in_option += 4;
proto_tree_add_item(opt_tree, hf_dsr_opt_err_unknownflow_id, tvb, offset_in_option, 2, ENC_BIG_ENDIAN);/* Opt err unknown flow flow id */
/*offset_in_option += 1;*/
break;
case DSR_RERR_TYPE_DEFAULTFLOWUNKNOWN:
proto_tree_add_item(opt_tree, hf_dsr_opt_err_defaultflowunknown_dest, tvb, offset_in_option, 4, ENC_NA);/* opt err default flow unknown original ip destination address */
/*offset_in_option += 4;*/
break;
}
break;
case DSR_OPT_TYPE_ACKREQ:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_ackreq_opt, &ti, "Acknowledgement request"); /* Opt subtree */
col_append_str(pinfo->cinfo, COL_INFO, "Ack request");
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option);
proto_item_set_len(ti, opt_len+2);
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_opt_ack_req_id, tvb, offset_in_option, 2, ENC_BIG_ENDIAN); /* Opt ack req id */
opt_id = tvb_get_ntohs(tvb, offset_in_option);
col_append_fstr(pinfo->cinfo, COL_INFO, " (id=0x%x)", opt_id);
offset_in_option += 2;
if(opt_len >= 6) {
proto_tree_add_item(opt_tree, hf_dsr_opt_ack_req_address, tvb, offset_in_option, 4, ENC_NA); /* Opt ack req id */
/*offset_in_option += 4;*/
}
break;
case DSR_OPT_TYPE_ACK:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_ack_opt, &ti, "Acknowledgement"); /* Opt subtree */
col_append_str(pinfo->cinfo, COL_INFO, "Ack");
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option);
proto_item_set_len(ti, opt_len+2);
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_opt_ack_id, tvb, offset_in_option, 2, ENC_BIG_ENDIAN); /* Opt ack id */
opt_id = tvb_get_ntohs(tvb, offset_in_option);
col_append_fstr(pinfo->cinfo, COL_INFO, " (id=0x%x)", opt_id);
offset_in_option += 2;
proto_tree_add_item(opt_tree, hf_dsr_opt_ack_src, tvb, offset_in_option, 4, ENC_NA); /* Opt ack source address */
offset_in_option += 4;
proto_tree_add_item(opt_tree, hf_dsr_opt_ack_dest, tvb, offset_in_option, 4, ENC_NA); /* Opt ack dest address */
/*offset_in_option += 4;*/
break;
case DSR_OPT_TYPE_SRCRT:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_srcrt_opt, &ti, "Source route"); /* Opt subtree */
col_append_str(pinfo->cinfo, COL_INFO, "Source route");
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option );
proto_item_set_len(ti, opt_len+2);
offset_in_option += 1;
proto_tree_add_bits_item(opt_tree, hf_dsr_opt_srcrt_firsthopext, tvb, offset_in_option*8, 1, ENC_BIG_ENDIAN); /* Opt srcrt first hop external */
proto_tree_add_bits_item(opt_tree, hf_dsr_opt_srcrt_lasthopext, tvb, offset_in_option*8+1, 1, ENC_BIG_ENDIAN); /* Opt srcrt last hop external */
proto_tree_add_bits_item(opt_tree, hf_dsr_opt_srcrt_reserved, tvb, offset_in_option*8+2, 4, ENC_BIG_ENDIAN); /* Opt srcrt reserved */
proto_tree_add_bits_item(opt_tree, hf_dsr_opt_srcrt_salvage, tvb, offset_in_option*8+6, 4, ENC_BIG_ENDIAN); /* Opt srcrt salvage */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_opt_srcrt_segsleft, tvb, offset_in_option , 1, ENC_BIG_ENDIAN); /* Opt srcrt segs left */
offset_in_option += 1;
if(opt_len > 2) {
opt_hoplist_tree = proto_tree_add_subtree(opt_tree, tvb, offset_in_option, 1, ett_dsr_srcrt_hoplist, &ti_hoplist, "Hop list" ); /* Opt hop list */
proto_item_append_text(ti_hoplist, " :");
for(i=0;i<(opt_len-2)/4;i++) {
proto_tree_add_item(opt_hoplist_tree, hf_dsr_opt_srcrt_address, tvb, offset_in_option , 4, ENC_NA); /* Opt srcrt addresses */
proto_item_append_text(ti_hoplist, " %s", tvb_ip_to_str(tvb, offset_in_option));
offset_in_option += 4;
}
}
break;
case DSR_OPT_TYPE_PADN:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_padn_opt, &ti, "PadN"); /* Opt subtree */
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option , 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option , 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option );
proto_item_set_len(ti, opt_len+2);
/*offset_in_option += 1;
offset_in_option += opt_len;*/
break;
case DSR_OPT_TYPE_PAD1:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_pad1_opt, &ti, "Pad1"); /* Opt subtree */
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option , 1, ENC_BIG_ENDIAN); /* Opt type */
/*offset_in_option += 1;*/
break;
case DSR_FS_OPT_TYPE_TIMEOUT :
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_fs_timeout_opt, &ti, "Timeout"); /* Opt subtree */
col_append_str(pinfo->cinfo, COL_INFO, "Timeout");
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option );
proto_item_set_len(ti, opt_len+2);
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_fs_opt_timeout_timeout, tvb, offset_in_option, 2, ENC_BIG_ENDIAN); /* Timeout */
/*offset_in_option += 2;*/
break;
case DSR_FS_OPT_TYPE_DESTFLOWID:
opt_tree = proto_tree_add_subtree(options_tree, tvb, offset_in_option, 1, ett_dsr_fs_destflowid_opt, &ti, "Destination and flow id"); /* Opt subtree */
col_append_str(pinfo->cinfo, COL_INFO, "Dest&FlowId");
proto_tree_add_item(opt_tree, hf_dsr_opttype, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt type */
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_optlen, tvb, offset_in_option, 1, ENC_BIG_ENDIAN); /* Opt len */
opt_len = tvb_get_guint8(tvb, offset_in_option );
proto_item_set_len(ti, opt_len+2);
offset_in_option += 1;
proto_tree_add_item(opt_tree, hf_dsr_fs_opt_destflowid_id, tvb, offset_in_option, 2, ENC_BIG_ENDIAN); /* Flow ID */
offset_in_option += 2;
proto_tree_add_item(opt_tree, hf_dsr_fs_opt_destflowid_dest, tvb, offset_in_option, 4, ENC_NA); /* Original IP Dest Address */
/*offset_in_option += 4;*/
break;
}
if (opt_type != DSR_OPT_TYPE_PAD1)
offset += 2+opt_len;
else
offset += 1;
if(offset-4 < opt_tot_len && opt_type != DSR_OPT_TYPE_PAD1 && opt_type != DSR_OPT_TYPE_PADN) {
col_append_str(pinfo->cinfo, COL_INFO, ", ");
}
}
} else { /* DSR Flow state header */
proto_tree_add_item(dsr_tree, hf_dsr_fs_hopcount, tvb, offset, 1, ENC_BIG_ENDIAN); /* Hop count */
offset += 1;
proto_tree_add_item(dsr_tree, hf_dsr_fs_id, tvb, offset, 1, ENC_BIG_ENDIAN); /* Flow identifier */
offset += 2;
}
/* Call other dissectors if needed */
next_tvb = tvb_new_subset_remaining(tvb, offset);
if (!dissector_try_uint(ip_dissector_table, nexthdr, next_tvb, pinfo, tree)) {
call_data_dissector(next_tvb, pinfo, tree);
}
return offset+4;
}
/* Register DSR with Wireshark.*/
void
proto_register_dsr(void)
{
/* Setup list of header fields */
static hf_register_info hf[] = {
{ &hf_dsr_nexthdr,
{ "Next header", "dsr.nexthdr",
FT_UINT8, BASE_HEX | BASE_EXT_STRING,
&ipproto_val_ext, 0x0,
"Next header protocol type", HFILL }
},
{ &hf_dsr_flowstate,
{ "Flow state", "dsr.flowstate",
FT_BOOLEAN, 8,
NULL, 0x80,
NULL, HFILL }
},
/* DSR normal header */
{ &hf_dsr_reserved,
{ "Reserved", "dsr.reserved",
FT_UINT8, BASE_HEX,
NULL, 0x7F,
NULL, HFILL }
},
{ &hf_dsr_length,
{ "Length", "dsr.len",
FT_UINT8, BASE_DEC,
NULL, 0x0,
"Payload length", HFILL }
},
{ &hf_dsr_opttype,
{ "Type", "dsr.option.type",
FT_UINT8, BASE_DEC,
VALS(dsropttypenames), 0x0,
NULL, HFILL }
},
{ &hf_dsr_optlen,
{ "Length", "dsr.option.len",
FT_UINT8, BASE_DEC,
NULL, 0x0,
"Option length", HFILL }
},
/* RREQ fields */
{ &hf_dsr_opt_rreq_id,
{ "Id", "dsr.option.rreq.id",
FT_UINT16, BASE_HEX_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_dsr_opt_rreq_targetaddress,
{ "Target address", "dsr.option.rreq.targetaddress",
FT_IPv4, BASE_NONE,
NULL, 0x0,
"Target IP address", HFILL }
},
{ &hf_dsr_opt_rreq_address,
{ "Hop", "dsr.option.rreq.address",
FT_IPv4, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
/* RREP fields */
{ &hf_dsr_opt_rrep_lasthopex,
{ "Last hop external", "dsr.option.rrep.lasthopex",
FT_BOOLEAN, 8,
NULL, 0x80,
NULL, HFILL }
},
{ &hf_dsr_opt_rrep_reserved,
{ "Reserved", "dsr.option.rrep.reserved",
FT_UINT8, BASE_HEX,
NULL, 0x7F,
NULL, HFILL }
},
{ &hf_dsr_opt_rrep_address,
{ "Hop", "dsr.option.rrep.address",
FT_IPv4, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
/* RERR fields */
{ &hf_dsr_opt_err_type,
{ "Type", "dsr.option.err.type",
FT_UINT8, BASE_DEC,
VALS(dsrrerrtypenames), 0x0,
NULL, HFILL }
},
{ &hf_dsr_opt_err_reserved,
{ "Reserved", "dsr.option.err.reserved",
FT_UINT8, BASE_HEX,
NULL, 0x00,
NULL, HFILL }
},
{ &hf_dsr_opt_err_salvage,
{ "Salvage", "dsr.option.err.salvage",
FT_UINT8, BASE_HEX,
NULL, 0x00,
NULL, HFILL }
},
{ &hf_dsr_opt_err_src,
{ "Source address", "dsr.option.err.src",
FT_IPv4, BASE_NONE,
NULL, 0x00,
"Source IP address", HFILL }
},
{ &hf_dsr_opt_err_dest,
{ "Destination address", "dsr.option.err.dest",
FT_IPv4, BASE_NONE,
NULL, 0x00,
"Destination IP address", HFILL }
},
{ &hf_dsr_opt_err_unreach_addr,
{ "Unreachable node address", "dsr.option.err.unreachablenode",
FT_IPv4, BASE_NONE,
NULL, 0x00,
"Unreachable node IP address", HFILL }
},
{ &hf_dsr_opt_err_unsupportedoption,
{ "Unsupported option", "dsr.option.err.unsupportedoption",
FT_UINT8, BASE_HEX,
NULL, 0x00,
NULL, HFILL }
},
/* ACKREQ fields */
{ &hf_dsr_opt_ack_req_id,
{ "Id", "dsr.option.ackreq.id",
FT_UINT16, BASE_HEX_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_dsr_opt_ack_req_address,
{ "Source address", "dsr.option.ackreq.address",
FT_IPv4, BASE_NONE,
NULL, 0x0,
"Source IP address", HFILL }
},
/* ACK fields */
{ &hf_dsr_opt_ack_id,
{ "Id", "dsr.option.ack.id",
FT_UINT16, BASE_HEX_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_dsr_opt_ack_src,
{ "Source IP", "dsr.option.ack.source",
FT_IPv4, BASE_NONE,
NULL, 0x0,
"Source IP address", HFILL }
},
{ &hf_dsr_opt_ack_dest,
{ "Destination IP", "dsr.option.ack.dest",
FT_IPv4, BASE_NONE,
NULL, 0x0,
"Destination IP address", HFILL }
},
/* SRCRT fields */
{ &hf_dsr_opt_srcrt_firsthopext,
{ "First hop external", "dsr.option.srcrt.firsthopext",
FT_BOOLEAN, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_dsr_opt_srcrt_lasthopext,
{ "Last hop external", "dsr.option.srcrt.lasthopext",
FT_BOOLEAN, BASE_NONE,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_dsr_opt_srcrt_reserved,
{ "Reserved", "dsr.option.srcrt.reserved",
FT_UINT8, BASE_HEX,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_dsr_opt_srcrt_salvage,
{ "Salvage", "dsr.option.srcrt.salvage",
FT_UINT8, BASE_HEX,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_dsr_opt_srcrt_segsleft,
{ "Segments left", "dsr.option.srcrt.segsleft",
FT_UINT8, BASE_DEC,
NULL, 0x3F,
NULL, HFILL }
},
{ &hf_dsr_opt_srcrt_address,
{ "Hop", "dsr.option.ack.address",
FT_IPv4, BASE_NONE,
NULL, 0x0,
"Hop IP address", HFILL }
},
/* DSR flow state */
{ &hf_dsr_fs_hopcount,
{ "Hop count", "dsr.fs.hopcount",
FT_UINT8, BASE_DEC,
NULL, 0x7F,
NULL, HFILL }
},
{ &hf_dsr_fs_id,
{ "Flow id", "dsr.fs.id",
FT_UINT16, BASE_HEX_DEC,
NULL, 0x00,
NULL, HFILL }
},
{ &hf_dsr_fs_opt_timeout_timeout,
{ "Timeout", "dsr.option.timeout.timeout",
FT_UINT16, BASE_DEC,
NULL, 0x0,
NULL, HFILL }
},
{ &hf_dsr_fs_opt_destflowid_id,
{ "Flow id", "dsr.option.destflowid.id",
FT_UINT16, BASE_HEX_DEC,
NULL, 0x0,
"New flow identifier", HFILL }
},
{ &hf_dsr_fs_opt_destflowid_dest,
{ "Destination IP", "dsr.option.destflowid.dest",
FT_IPv4, BASE_NONE,
NULL, 0x0,
"New IP destination address", HFILL }
},
{ &hf_dsr_opt_err_unknownflow_dest,
{ "Original IP destination", "dsr.option.err.unknownflow.dest",
FT_IPv4, BASE_NONE,
NULL, 0x00,
"Original IP destination address", HFILL }
},
{ &hf_dsr_opt_err_unknownflow_id,
{ "Flow id", "dsr.option.err.unknownflow.id",
FT_UINT16, BASE_HEX_DEC,
NULL, 0x00,
NULL, HFILL }
},
{ &hf_dsr_opt_err_defaultflowunknown_dest,
{ "Original IP destination", "dsr.option.err.defaultflowunknow.dest",
FT_IPv4, BASE_NONE,
NULL, 0x00,
"Original IP destination address", HFILL }
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_dsr,
&ett_dsr_options,
&ett_dsr_rreq_opt,
&ett_dsr_rrep_opt,
&ett_dsr_rerr_opt,
&ett_dsr_ackreq_opt,
&ett_dsr_ack_opt,
&ett_dsr_srcrt_opt,
&ett_dsr_padn_opt,
&ett_dsr_pad1_opt,
&ett_dsr_fs_timeout_opt,
&ett_dsr_fs_destflowid_opt,
&ett_dsr_rreq_hoplist,
&ett_dsr_rrep_hoplist,
&ett_dsr_srcrt_hoplist
};
/* Register the protocol name and description */
proto_dsr = proto_register_protocol(
"Dynamic Source Routing",
"DSR",
"dsr");
/* Required function calls to register the header fields and subtrees */
proto_register_field_array(proto_dsr, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
}
void
proto_reg_handoff_dsr(void)
{
dissector_handle_t dsr_handle;
ip_dissector_table = find_dissector_table("ip.proto");
dsr_handle = create_dissector_handle(dissect_dsr, proto_dsr);
dissector_add_uint("ip.proto", IP_PROTO_DSR, dsr_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vim: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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