/* Decode DREG-CMD messages. */
void dissect_mac_mgmt_msg_dreg_cmd_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint offset = 0;
guint tlv_offset;
guint tvb_len, payload_type;
proto_item *dreg_cmd_item = NULL;
proto_tree *dreg_cmd_tree = NULL;
proto_tree *tlv_tree = NULL;
tlv_info_t tlv_info;
gint tlv_type;
gint tlv_len;
gboolean hmac_found = FALSE;
/* Ensure the right payload type */
payload_type = tvb_get_guint8(tvb, 0);
if(payload_type != MAC_MGMT_MSG_DREG_CMD)
{
return;
}
if (tree)
{ /* we are being asked for details */
/* Get the tvb reported length */
tvb_len = tvb_reported_length(tvb);
/* display MAC payload type DREG-CMD */
dreg_cmd_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_dreg_cmd_decoder, tvb, 0, tvb_len, "MAC Management Message, DREG-CMD (29)");
/* add MAC DREG CMD subtree */
dreg_cmd_tree = proto_item_add_subtree(dreg_cmd_item, ett_mac_mgmt_msg_dreg_decoder);
/* display the Message Type */
proto_tree_add_item(dreg_cmd_tree, hf_dreg_cmd_message_type, tvb, offset, 1, FALSE);
offset ++;
/* display the Action Code */
if (include_cor2_changes)
proto_tree_add_item(dreg_cmd_tree, hf_dreg_cmd_action_cor2, tvb, offset, 1, FALSE);
else
proto_tree_add_item(dreg_cmd_tree, hf_dreg_cmd_action, tvb, offset, 1, FALSE);
/* show the Reserved bits */
proto_tree_add_item(dreg_cmd_tree, hf_dreg_cmd_reserved, tvb, offset, 1, FALSE);
offset ++;
while(offset < tvb_len)
{
/* Get the TLV data. */
init_tlv_info(&tlv_info, tvb, offset);
/* get the TLV type */
tlv_type = get_tlv_type(&tlv_info);
/* get the TLV length */
tlv_len = get_tlv_length(&tlv_info);
if(tlv_type == -1 || tlv_len > MAX_TLV_LEN || tlv_len < 1)
{ /* invalid tlv info */
if (check_col(pinfo->cinfo, COL_INFO))
{
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "DREG-CMD TLV error");
}
proto_tree_add_item(dreg_cmd_tree, hf_dreg_invalid_tlv, tvb, offset, (tvb_len - offset), FALSE);
break;
}
/* get the offset to the TLV data */
tlv_offset = offset + get_tlv_value_offset(&tlv_info);
switch (tlv_type) {
case HMAC_TUPLE: /* Table 348d */
/* decode and display the HMAC Tuple */
tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_cmd_tree, proto_mac_mgmt_msg_dreg_cmd_decoder, tvb, tlv_offset, tlv_len, "HMAC Tuple (%u byte(s))", tlv_len);
wimax_hmac_tuple_decoder(tlv_tree, tvb, tlv_offset, tlv_len);
hmac_found = TRUE;
break;
case CMAC_TUPLE: /* Table 348b */
/* decode and display the CMAC Tuple */
tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_cmd_tree, proto_mac_mgmt_msg_dreg_cmd_decoder, tvb, tlv_offset, tlv_len, "CMAC Tuple (%u byte(s))", tlv_len);
wimax_cmac_tuple_decoder(tlv_tree, tvb, tlv_offset, tlv_len);
break;
default:
/* Decode DREG-CMD sub-TLV's */
tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_cmd_tree, proto_mac_mgmt_msg_dreg_cmd_decoder, tvb, tlv_offset, tlv_len, "DREG-CMD sub-TLV's (%u byte(s))", tlv_len);
dissect_dreg_tlv(tlv_tree, tlv_type, tvb, tlv_offset, tlv_len);
break;
}
offset = tlv_len + tlv_offset;
} /* end of TLV process while loop */
if (!hmac_found)
proto_item_append_text(dreg_cmd_tree, " (HMAC Tuple is missing !)");
}
}
/* Decode DREG-REQ messages. */
static void dissect_mac_mgmt_msg_dreg_req_decoder(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint offset = 0;
guint tlv_offset;
guint tvb_len;
proto_item *dreg_req_item;
proto_tree *dreg_req_tree;
proto_tree *tlv_tree = NULL;
tlv_info_t tlv_info;
gint tlv_type;
gint tlv_len;
gboolean hmac_found = FALSE;
{ /* we are being asked for details */
/* Get the tvb reported length */
tvb_len = tvb_reported_length(tvb);
/* display MAC payload type DREG-REQ */
dreg_req_item = proto_tree_add_protocol_format(tree, proto_mac_mgmt_msg_dreg_req_decoder, tvb, 0, -1, "MAC Management Message, DREG-REQ");
/* add MAC DREG REQ subtree */
dreg_req_tree = proto_item_add_subtree(dreg_req_item, ett_mac_mgmt_msg_dreg_decoder);
/* display the Action Code */
proto_tree_add_item(dreg_req_tree, hf_dreg_req_action, tvb, offset, 1, ENC_BIG_ENDIAN);
/* show the Reserved bits */
proto_tree_add_item(dreg_req_tree, hf_dreg_req_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
offset++;
while(offset < tvb_len)
{
/* Get the TLV data. */
init_tlv_info(&tlv_info, tvb, offset);
/* get the TLV type */
tlv_type = get_tlv_type(&tlv_info);
/* get the TLV length */
tlv_len = get_tlv_length(&tlv_info);
if(tlv_type == -1 || tlv_len > MAX_TLV_LEN || tlv_len < 1)
{ /* invalid tlv info */
col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "DREG-REQ TLV error");
proto_tree_add_item(dreg_req_tree, hf_dreg_invalid_tlv, tvb, offset, (tvb_len - offset), ENC_NA);
break;
}
/* get the offset to the TLV data */
tlv_offset = offset + get_tlv_value_offset(&tlv_info);
switch (tlv_type) {
case HMAC_TUPLE: /* Table 348d */
/* decode and display the HMAC Tuple */
tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_req_tree, proto_mac_mgmt_msg_dreg_req_decoder, tvb, tlv_offset, tlv_len, "HMAC Tuple (%u byte(s))", tlv_len);
wimax_hmac_tuple_decoder(tlv_tree, tvb, tlv_offset, tlv_len);
hmac_found = TRUE;
break;
case CMAC_TUPLE: /* Table 348b */
/* decode and display the CMAC Tuple */
tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_req_tree, proto_mac_mgmt_msg_dreg_req_decoder, tvb, tlv_offset, tlv_len, "CMAC Tuple (%u byte(s))", tlv_len);
wimax_cmac_tuple_decoder(tlv_tree, tvb, tlv_offset, tlv_len);
break;
default:
/* Decode DREG-REQ sub-TLV's */
tlv_tree = add_protocol_subtree(&tlv_info, ett_mac_mgmt_msg_dreg_decoder, dreg_req_tree, proto_mac_mgmt_msg_dreg_req_decoder, tvb, tlv_offset, tlv_len, "DREG-REQ sub-TLV's (%u byte(s))", tlv_len);
dissect_dreg_tlv(tlv_tree, tlv_type, tvb, tlv_offset, tlv_len);
break;
}
offset = tlv_len + tlv_offset;
} /* end of TLV process while loop */
if (!hmac_found)
proto_item_append_text(dreg_req_tree, " (HMAC Tuple is missing !)");
}
}