plugins-wimax-wimax_compact_dlmap_ie_decoder.c

Intel的WIMAX代码,主要是mac层code

				proto_tree_add_item(tree, hf_cdlmap_dl_map_type_1, tvb, dl_map_offset, 1, FALSE);
				/* display the UL-MAP append */
				proto_tree_add_item(tree, hf_cdlmap_ul_map_append_1, tvb, dl_map_offset, 1, FALSE);
				/* move to next byte */
				dl_map_offset++;
				nibble_offset = 0;
			}
			else
			{	/* display the DL-MAP type */
				proto_tree_add_item(tree, hf_cdlmap_dl_map_type, tvb, dl_map_offset, 1, FALSE);
				/* display the UL-MAP append */
				proto_tree_add_item(tree, hf_cdlmap_ul_map_append, tvb, dl_map_offset, 1, FALSE);
				nibble_offset = 1;
			}
			length = 1;
			/* decode RCID IE */
			nibble_length = wimax_compact_dlmap_rcid_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
			length += nibble_length;
			dl_map_offset += (nibble_length >> 1);
			nibble_offset = (nibble_length & 1);
			/* check harq mode */
			if(!harq_mode)
			{	/* display the Nep and Nsch Code */
				if(nibble_offset & 1)
				{
					proto_tree_add_item(tree, hf_cdlmap_nep_code_1, tvb, dl_map_offset, 1, FALSE);
					/* move to next byte */
					dl_map_offset++;
					proto_tree_add_item(tree, hf_cdlmap_nsch_code, tvb, dl_map_offset, 1, FALSE);
				}
				else
				{
					proto_tree_add_item(tree, hf_cdlmap_nep_code, tvb, dl_map_offset, 1, FALSE);
					proto_tree_add_item(tree, hf_cdlmap_nsch_code_1, tvb, dl_map_offset, 1, FALSE);
					/* move to next byte */
					dl_map_offset++;
				}
				length += 2;
			}
			else if(harq_mode == 1)
			{	/* display the Shortened DIUC and Companded SC */
				if(nibble_offset & 1)
				{
					proto_tree_add_item(tree, hf_cdlmap_shortened_diuc_1, tvb, dl_map_offset, 2, FALSE);
					proto_tree_add_item(tree, hf_cdlmap_companded_sc_1, tvb, dl_map_offset, 2, FALSE);
				}
				else
				{
					proto_tree_add_item(tree, hf_cdlmap_shortened_diuc, tvb, dl_map_offset, 1, FALSE);
						proto_tree_add_item(tree, hf_cdlmap_companded_sc, tvb, dl_map_offset, 1, FALSE);
				}
				/* move to next byte */
				dl_map_offset++;
				length += 2;
			}
			/* display BIN offset */
			if(nibble_offset & 1)
			{
				proto_tree_add_item(tree, hf_cdlmap_bin_offset_1, tvb, dl_map_offset, 2, FALSE);
				/* move to next byte */
				dl_map_offset++;
			}
			else
			{
				proto_tree_add_item(tree, hf_cdlmap_bin_offset, tvb, dl_map_offset, 1, FALSE);
				/* move to next byte */
				dl_map_offset++;
			}
			length += 2;
			/* decode HARQ Control IE */
			nibble_length = wimax_compact_dlmap_harq_control_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
			length += nibble_length;
			dl_map_offset += ((nibble_offset + nibble_length) >> 1);
			nibble_offset = ((nibble_offset + nibble_length) & 1);
			/* decode CQICH Control IE */
			nibble_length = wimax_compact_dlmap_cqich_control_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
			length += nibble_length;
			dl_map_offset += ((nibble_offset + nibble_length) >> 1);
			nibble_offset = ((nibble_offset + nibble_length) & 1);
			if(ul_map_append)
			{	/* check harq mode */
				if(harq_mode == 1)
				{	/* display the Shortened DIUC and Companded SC */
					if(nibble_offset & 1)
					{
						proto_tree_add_item(tree, hf_cdlmap_shortened_diuc_1, tvb, dl_map_offset, 2, FALSE);
						proto_tree_add_item(tree, hf_cdlmap_companded_sc_1, tvb, dl_map_offset, 2, FALSE);
					}
					else
					{
						proto_tree_add_item(tree, hf_cdlmap_shortened_diuc, tvb, dl_map_offset, 1, FALSE);
						proto_tree_add_item(tree, hf_cdlmap_companded_sc, tvb, dl_map_offset, 1, FALSE);
					}
					/* move to next byte */
					dl_map_offset++;
					length += 2;
				}
				else if(!harq_mode)
				{	/* display the Nep and Nsch Code */
					if(nibble_offset & 1)
					{
						proto_tree_add_item(tree, hf_cdlmap_nep_code_1, tvb, dl_map_offset, 1, FALSE);
						/* move to next byte */
						dl_map_offset++;
						proto_tree_add_item(tree, hf_cdlmap_nsch_code, tvb, dl_map_offset, 1, FALSE);
					}
					else
					{
						proto_tree_add_item(tree, hf_cdlmap_nep_code, tvb, dl_map_offset, 1, FALSE);
						proto_tree_add_item(tree, hf_cdlmap_nsch_code_1, tvb, dl_map_offset, 1, FALSE);
						/* move to next byte */
						dl_map_offset++;
					}
					length += 2;
				}
				/* display BIN offset */
				if(nibble_offset & 1)
				{
					proto_tree_add_item(tree, hf_cdlmap_bin_offset_1, tvb, dl_map_offset, 2, FALSE);
					/* move to next byte */
					dl_map_offset++;
				}
				else
				{
					proto_tree_add_item(tree, hf_cdlmap_bin_offset, tvb, dl_map_offset, 1, FALSE);
					/* move to next byte */
					dl_map_offset++;
				}
				length += 2;
				/* decode HARQ Control IE */
				nibble_length = wimax_compact_dlmap_harq_control_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
				length += nibble_length;
			}
		break;
		case COMPACT_DL_MAP_TYPE_UIUC:/* 6.3.2.3.43.6.4 */
			if(nibble_offset & 1)
			{	/* display the DL-MAP type */
				proto_tree_add_item(tree, hf_cdlmap_dl_map_type_1, tvb, dl_map_offset, 1, FALSE);
				/* display the reserved */
				proto_tree_add_item(tree, hf_cdlmap_reserved_1, tvb, dl_map_offset, 1, FALSE);
				/* move to next byte */
				dl_map_offset++;
				/* get the new byte */
				byte = tvb_get_guint8(tvb, dl_map_offset);
				/* get the DIUC */
				diuc = ((byte & MSB_NIBBLE_MASK) >> 4);
				/* display the DIUC */
				proto_tree_add_item(tree, hf_cdlmap_diuc, tvb, dl_map_offset, 1, FALSE);
			}
			else
			{
				/* display the DL-MAP type */
				proto_tree_add_item(tree, hf_cdlmap_dl_map_type, tvb, dl_map_offset, 1, FALSE);
				/* display the reserved */
				proto_tree_add_item(tree, hf_cdlmap_reserved, tvb, dl_map_offset, 1, FALSE);
				/* get the DIUC */
				diuc = (tvb_get_guint8(tvb, dl_map_offset) & LSB_NIBBLE_MASK);
				/* display the DIUC */
				proto_tree_add_item(tree, hf_cdlmap_diuc_1, tvb, dl_map_offset, 1, FALSE);
				/* move to next byte */
				dl_map_offset++;
			}
			length = 2;
			if(diuc == 15)
			{	/* Extended DIUC dependent IE */
				nibble_length =  wimax_extended_diuc_dependent_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
				length += nibble_length;
				dl_map_offset += (nibble_length >> 1);
				nibble_offset = (nibble_length & 1);
			}
			else
			{	/* decode RCID IE */
				nibble_length = wimax_compact_dlmap_rcid_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
				length += nibble_length;
				dl_map_offset += (nibble_length >> 1);
				nibble_offset = (nibble_length & 1);
				/* display Number of subchannels */
				if(nibble_offset & 1)
					proto_tree_add_item(tree, hf_cdlmap_diuc_num_of_subchannels_1, tvb, dl_map_offset, 1, FALSE);
				else
					proto_tree_add_item(tree, hf_cdlmap_diuc_num_of_subchannels, tvb, dl_map_offset, 1, FALSE);
				length += 2;
				/* display the repetition coding indication and reserved bits */
				if(nibble_offset & 1)
				{
					proto_tree_add_item(tree, hf_cdlmap_diuc_repetition_coding_indication_1, tvb, dl_map_offset, 1, FALSE);
					proto_tree_add_item(tree, hf_cdlmap_diuc_reserved_1, tvb, dl_map_offset, 1, FALSE);
				}
				else
				{
					proto_tree_add_item(tree, hf_cdlmap_diuc_repetition_coding_indication, tvb, dl_map_offset, 1, FALSE);
					proto_tree_add_item(tree, hf_cdlmap_diuc_reserved, tvb, dl_map_offset, 1, FALSE);
				}
				length += 1;
			}
			/* decode HARQ Control IE */
			nibble_length = wimax_compact_dlmap_harq_control_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
			length += nibble_length;
			dl_map_offset += ((nibble_offset + nibble_length) >> 1);
			nibble_offset = ((nibble_offset + nibble_length) & 1);
			/* decode CQICH Control IE */
			nibble_length = wimax_compact_dlmap_cqich_control_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
			length += nibble_length;
		break;
		case COMPACT_DL_MAP_TYPE_FORMAT_CONF_IE:/* 6.3.2.3.43.2 */
			/* decode the format configuration IE */
			nibble_length = wimax_compact_dlmap_format_configuration_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);
			length = nibble_length;
		break;
		case COMPACT_DL_MAP_TYPE_HARQ_ACK_BITMAP_IE:/* 6.3.2.3.43.6.5 */
			if(nibble_offset & 1)
			{	/* display the DL-MAP type */
				proto_tree_add_item(tree, hf_cdlmap_dl_map_type_1, tvb, dl_map_offset, 1, FALSE);
				/* display the reserved */
				proto_tree_add_item(tree, hf_cdlmap_reserved_1, tvb, dl_map_offset, 1, FALSE);
				length = 1;
				/* move to next byte */
				dl_map_offset++;
				/* get the bit map length */
				byte = tvb_get_guint8(tvb, dl_map_offset);
				bit_map_length = ((byte & MSB_NIBBLE_MASK) >> 4);
				/* display BITMAP Length */
				proto_tree_add_item(tree, hf_cdlmap_bit_map_length, tvb, dl_map_offset, 1, FALSE);
				/* display BITMAP */
				proto_tree_add_item(tree, hf_cdlmap_bit_map, tvb, dl_map_offset, bit_map_length + 1, FALSE);
				length += (1 + bit_map_length * 2);
			}
			else
			{
				/* display the DL-MAP type */
				proto_tree_add_item(tree, hf_cdlmap_dl_map_type, tvb, dl_map_offset, 1, FALSE);
				/* display the reserved */
				proto_tree_add_item(tree, hf_cdlmap_reserved, tvb, dl_map_offset, 1, FALSE);
				/* display BITMAP Length */
				proto_tree_add_item(tree, hf_cdlmap_bit_map_length_1, tvb, dl_map_offset, 1, FALSE);
				length = 2;
				/* get the bit map length */
				bit_map_length =  (byte & LSB_NIBBLE_MASK);
				/* move to next byte */
				dl_map_offset++;
				/* display BITMAP */
				proto_tree_add_item(tree, hf_cdlmap_bit_map, tvb, dl_map_offset, bit_map_length, FALSE);
				length += (bit_map_length * 2);
			}
		break;
		case COMPACT_DL_MAP_TYPE_EXTENSION:/* 6.3.2.3.43.6.6 */
			/* decode the Compact DL-MAP externsion IE */
			nibble_length = wimax_cdlmap_extension_ie_decoder(tree, pinfo, tvb, dl_map_offset, nibble_offset);//, cqich_indicator);
			length = nibble_length;
		break;
		default:/* Reserved Type */
			/* display the reserved type */
			proto_tree_add_item(tree, hf_cdlmap_reserved_type_1, tvb, dl_map_offset, 1, FALSE);
			length = 1;
		break;
	}
	/* Update the nibble_offset and length */
	return length;
}

/* Format Configuration IE shifts */
#define CID_TYPE_SHIFT                      30
#define SAFETY_PATTERN_SHIFT                25
#define BAND_AMC_SUBCHANNEL_TYPE_SHIFT      23
#define MAX_LOGICAL_BANDS_SHIFT             21
#define NUM_BROADCAST_SYMBOLS_SHIFT         16
#define NUM_DL_AMC_SYMBOLS_SHIFT            10
#define NUM_UL_AMC_SYMBOLS_SHIFT            4
#define CID_TYPE_SHIFT_1              (CID_TYPE_SHIFT-NUM_UL_AMC_SYMBOLS_SHIFT)
#define SAFETY_PATTERN_SHIFT_1        (SAFETY_PATTERN_SHIFT-NUM_UL_AMC_SYMBOLS_SHIFT)
#define BAND_AMC_SUBCHANNEL_TYPE_SHIFT_1 (BAND_AMC_SUBCHANNEL_TYPE_SHIFT-NUM_UL_AMC_SYMBOLS_SHIFT)
#define MAX_LOGICAL_BANDS_SHIFT_1     (MAX_LOGICAL_BANDS_SHIFT-NUM_UL_AMC_SYMBOLS_SHIFT)
#define NUM_BROADCAST_SYMBOLS_SHIFT_1 (NUM_BROADCAST_SYMBOLS_SHIFT-NUM_UL_AMC_SYMBOLS_SHIFT)
#define NUM_DL_AMC_SYMBOLS_SHIFT_1    (NUM_DL_AMC_SYMBOLS_SHIFT-NUM_UL_AMC_SYMBOLS_SHIFT)
//#define NUM_UL_AMC_SYMBOLS_SHIFT_1    0

/* Compact DL-MAP Format Configuration IE (6.3.2.3.43.2) decoder */
static guint wimax_compact_dlmap_format_configuration_ie_decoder(proto_tree *tree, packet_info *pinfo, tvbuff_t *tvb, guint offset, guint nibble_offset)
{
	guint length = 0;
	guint dl_map_type, new_format_ind;
	guint dl_map_offset;
	guint32 tvb_value;

	UNREFERENCED_PARAMETER(pinfo);

#ifdef DEBUG
	/* update the info column */
	if (check_col(pinfo->cinfo, COL_INFO))
	{
		col_append_sep_str(pinfo->cinfo, COL_INFO, NULL, "Format Configuration IE");
	}
#endif
	/* set the local offset */
	dl_map_offset = offset;
	/* Get the first byte */
	tvb_value = tvb_get_guint8(tvb, dl_map_offset);
	if(nibble_offset & 1)
	{	/* get the DL-MAP type */
		dl_map_type = ((tvb_value & DL_MAP_TYPE_MASK_1) >> 1);
		/* ensure the dl-map type is Format Configuration IE */
		if(dl_map_type != COMPACT_DL_MAP_TYPE_FORMAT_CONF_IE)
			return 0;
		new_format_ind = (tvb_value & 0x01);
		/* display the DL-MAP type */
		proto_tree_add_item(tree, hf_format_config_ie_dl_map_type_1, tvb, dl_map_offset, 1, FALSE);
		/* display the New format Indication */
		proto_tree_add_item(tree, hf_format_config_ie_new_format_indication_1, tvb, dl_map_offset, 1, FALSE);
		/* update the length in nibble */
		length = 1;
		/* move to next byte */
		dl_map_offset++;
		if(new_format_ind)
		{	/* display the CID Type */
			proto_tree_add_item(tree, hf_format_config_ie_cid_type, tvb, dl_map_offset, 4, FALSE);
			/* display the Safety Pattern */
			proto_tree_add_item(tree, hf_format_config_ie_safety_pattern, tvb, dl_map_offset, 4, FALSE);
			/* display the Subchannel pattern */
			proto_tree_add_item(tree, hf_format_config_ie_subchannel_type, tvb, dl_map_offset, 4, FALSE);
			/* display the max logical bands */
			proto_tree_add_item(tree, hf_format_config_ie_max_logical_bands, tvb, dl_map_offset, 4, FALSE);
			/* display the number of broadcast symbols */
			proto_tree_add_item(tree, hf_format_config_ie_num_of_broadcast_symbol, tvb, dl_map_offset, 4, FALSE);
			/* display the number of dl band AMC symbols */
			proto_tree_add_item(tree, hf_format_config_ie_num_of_dl_band_amc_symbol, tvb, dl_map_offset, 4, FALSE);
			/* display the number of ul band AMC symbols */
			proto_tree_add_item(tree, hf_format_config_ie_num_of_ul_band_amc_symbol, tvb, dl_map_offset, 4, FALSE);
			/* update the length in nibble */
			length += 7;
			/* Get the next 32-bit word */
			tvb_value = tvb_get_ntohl(tvb, dl_map_offset);
			/* get the CID type */