forked from osmocom/wireshark
337 lines
9.5 KiB
C
337 lines
9.5 KiB
C
/* packet-dccrsp.c
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* Routines for DCC Response Message dissection
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* Copyright 2004, Darryl Hymel <darryl.hymel[AT]arrisi.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/expert.h>
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void proto_register_docsis_dccrsp(void);
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void proto_reg_handoff_docsis_dccrsp(void);
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#define DCCRSP_CM_JUMP_TIME 1
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#define DCCRSP_KEY_SEQ_NUM 31
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#define DCCRSP_HMAC_DIGEST 27
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/* Define DCC-RSP CM Jump Time subtypes
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* These are subtype of DCCRSP_CM_JUMP_TIME (1)
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*/
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#define DCCRSP_CM_JUMP_TIME_LENGTH 1
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#define DCCRSP_CM_JUMP_TIME_START 2
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/* Initialize the protocol and registered fields */
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static int proto_docsis_dccrsp = -1;
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static int hf_docsis_dccrsp_tran_id = -1;
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static int hf_docsis_dccrsp_conf_code = -1;
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static int hf_docsis_dcc_type = -1;
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static int hf_docsis_dcc_length = -1;
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static int hf_docsis_dcc_cm_jump_subtype = -1;
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static int hf_docsis_dcc_cm_jump_length = -1;
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static int hf_docsis_dccrsp_cm_jump_time_length = -1;
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static int hf_docsis_dccrsp_cm_jump_time_start = -1;
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static int hf_docsis_dccrsp_key_seq_num = -1;
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static int hf_docsis_dccrsp_hmac_digest = -1;
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/* Initialize the subtree pointers */
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static gint ett_docsis_dccrsp = -1;
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static gint ett_docsis_dccrsp_cm_jump_time = -1;
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static gint ett_docsis_dccrsp_tlv = -1;
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static expert_field ei_docsis_dccrsp_tlvlen_bad = EI_INIT;
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static dissector_handle_t docsis_dccrsp_handle;
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/* Defined in packet-tlv.c */
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extern value_string docsis_conf_code[];
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static const value_string dccrsp_tlv_vals[] = {
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{DCCRSP_CM_JUMP_TIME, "CM Jump Time Encodings"},
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{DCCRSP_KEY_SEQ_NUM, "Auth Key Sequence Number"},
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{DCCRSP_HMAC_DIGEST, "HMAC-Digest Number"},
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{0, NULL}
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};
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static const value_string cm_jump_subtlv_vals[] = {
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{DCCRSP_CM_JUMP_TIME_LENGTH, "Length of Jump"},
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{DCCRSP_CM_JUMP_TIME_START, "Start Time of Jump"},
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{0, NULL}
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};
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/* Dissection */
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static void
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dissect_dccrsp_cm_jump_time (tvbuff_t * tvb, packet_info* pinfo, proto_tree * tree, int start, guint16 len)
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{
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guint8 type;
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guint32 length;
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proto_tree *dcc_tree;
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proto_item *dcc_item, *tlv_len_item;
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int pos;
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pos = start;
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while ( pos < ( start + len) )
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{
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type = tvb_get_guint8 (tvb, pos);
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dcc_tree = proto_tree_add_subtree(tree, tvb, pos, -1,
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ett_docsis_dccrsp_cm_jump_time, &dcc_item,
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val_to_str(type, cm_jump_subtlv_vals,
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"Unknown TLV (%u)"));
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proto_tree_add_uint (dcc_tree, hf_docsis_dcc_cm_jump_subtype, tvb, pos, 1, type);
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pos++;
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tlv_len_item = proto_tree_add_item_ret_uint (dcc_tree, hf_docsis_dcc_cm_jump_length, tvb, pos, 1, ENC_NA, &length);
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pos++;
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proto_item_set_len(dcc_item, length + 2);
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switch (type)
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{
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case DCCRSP_CM_JUMP_TIME_LENGTH:
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if (length == 4)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_cm_jump_time_length, tvb, pos, length, ENC_BIG_ENDIAN);
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}
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else
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{
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expert_add_info_format(pinfo, tlv_len_item, &ei_docsis_dccrsp_tlvlen_bad, "Wrong TLV length: %u", length);
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}
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break;
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case DCCRSP_CM_JUMP_TIME_START:
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if (length == 8)
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{
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_cm_jump_time_start, tvb, pos, length, ENC_BIG_ENDIAN);
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}
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else
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{
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expert_add_info_format(pinfo, tlv_len_item, &ei_docsis_dccrsp_tlvlen_bad, "Wrong TLV length: %u", length);
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}
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break;
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}
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pos += length;
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}
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}
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static int
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dissect_dccrsp (tvbuff_t * tvb, packet_info * pinfo, proto_tree * tree, void* data _U_)
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{
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guint16 pos;
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guint8 type;
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guint32 length;
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proto_tree *dcc_tree, *tlv_tree;
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proto_item *dcc_item, *tlv_item, *tlv_len_item;
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col_set_str(pinfo->cinfo, COL_INFO, "DCC-RSP Message");
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dcc_item = proto_tree_add_item (tree, proto_docsis_dccrsp, tvb, 0, -1, ENC_NA);
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dcc_tree = proto_item_add_subtree (dcc_item, ett_docsis_dccrsp);
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_tran_id, tvb, 0, 2, ENC_BIG_ENDIAN);
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proto_tree_add_item (dcc_tree, hf_docsis_dccrsp_conf_code, tvb, 2, 1, ENC_BIG_ENDIAN);
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pos = 3;
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while (tvb_reported_length_remaining(tvb, pos) > 0)
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{
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type = tvb_get_guint8 (tvb, pos);
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tlv_tree = proto_tree_add_subtree(dcc_tree, tvb, pos, -1,
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ett_docsis_dccrsp_tlv, &tlv_item,
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val_to_str(type, dccrsp_tlv_vals,
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"Unknown TLV (%u)"));
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proto_tree_add_uint (tlv_tree, hf_docsis_dcc_type, tvb, pos, 1, type);
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pos++;
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tlv_len_item = proto_tree_add_item_ret_uint (tlv_tree, hf_docsis_dcc_length, tvb, pos, 1, ENC_NA, &length);
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pos++;
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proto_item_set_len(tlv_item, length + 2);
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switch (type)
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{
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case DCCRSP_CM_JUMP_TIME:
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dissect_dccrsp_cm_jump_time (tvb, pinfo, tlv_tree, pos, length );
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break;
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case DCCRSP_KEY_SEQ_NUM:
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if (length == 1)
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{
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proto_tree_add_item (tlv_tree, hf_docsis_dccrsp_key_seq_num, tvb, pos, length, ENC_BIG_ENDIAN);
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}
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else
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{
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expert_add_info_format(pinfo, tlv_len_item, &ei_docsis_dccrsp_tlvlen_bad, "Wrong TLV length: %u", length);
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}
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break;
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case DCCRSP_HMAC_DIGEST:
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if (length == 20)
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{
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proto_tree_add_item (tlv_tree, hf_docsis_dccrsp_hmac_digest, tvb, pos, length, ENC_NA);
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}
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else
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{
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expert_add_info_format(pinfo, tlv_len_item, &ei_docsis_dccrsp_tlvlen_bad, "Wrong TLV length: %u", length);
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}
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break;
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} /* switch(type) */
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pos += length;
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} /* while (tvb_reported_length_remaining(tvb, pos) > 0) */
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return tvb_captured_length(tvb);
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}
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/* Register the protocol with Wireshark */
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void
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proto_register_docsis_dccrsp (void)
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{
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static hf_register_info hf[] = {
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{&hf_docsis_dccrsp_tran_id ,
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{
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"Transaction ID",
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"docsis_dccrsp.tran_id",
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FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_conf_code ,
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{
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"Confirmation Code",
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"docsis_dccrsp.conf_code",
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FT_UINT8, BASE_DEC, VALS (docsis_conf_code), 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dcc_type,
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{
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"Type",
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"docsis_dccrsp.tlvtype",
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FT_UINT8, BASE_DEC, VALS(dccrsp_tlv_vals), 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dcc_length,
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{
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"Length",
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"docsis_dccrsp.tlvlen",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dcc_cm_jump_subtype,
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{
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"Type",
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"docsis_dccrsp.cm_jump_tlvtype",
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FT_UINT8, BASE_DEC, VALS(cm_jump_subtlv_vals), 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dcc_cm_jump_length,
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{
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"Length",
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"docsis_dccrsp.cm_jump_tlvlen",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_cm_jump_time_length ,
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{
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"Length of Jump",
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"docsis_dccrsp.cm_jump_time_length",
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FT_UINT32, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_cm_jump_time_start ,
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{
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"Start Time of Jump",
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"docsis_dccrsp.cm_jump_time_start",
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FT_UINT64, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_key_seq_num ,
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{
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"Auth Key Sequence Number",
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"docsis_dccrsp.key_seq_num",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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{&hf_docsis_dccrsp_hmac_digest ,
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{
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"HMAC-Digest Number",
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"docsis_dccrsp.hmac_digest",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL,
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HFILL
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}
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},
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};
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static gint *ett[] = {
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&ett_docsis_dccrsp,
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&ett_docsis_dccrsp_cm_jump_time,
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&ett_docsis_dccrsp_tlv,
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};
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static ei_register_info ei[] = {
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{&ei_docsis_dccrsp_tlvlen_bad, { "docsis_dccrsp.tlvlenbad", PI_MALFORMED, PI_ERROR, "Bad TLV length", EXPFILL}},
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};
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expert_module_t* expert_docsis_dccrsp;
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proto_docsis_dccrsp =
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proto_register_protocol ("DOCSIS Downstream Channel Change Response",
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"DOCSIS DCC-RSP", "docsis_dccrsp");
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proto_register_field_array (proto_docsis_dccrsp, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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expert_docsis_dccrsp = expert_register_protocol(proto_docsis_dccrsp);
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expert_register_field_array(expert_docsis_dccrsp, ei, array_length(ei));
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docsis_dccrsp_handle = register_dissector ("docsis_dccrsp", dissect_dccrsp, proto_docsis_dccrsp);
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}
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void
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proto_reg_handoff_docsis_dccrsp (void)
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{
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dissector_add_uint ("docsis_mgmt", 0x18, docsis_dccrsp_handle);
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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