Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 595 insertions, 0 deletions

diff --git a/netwerk/sctp/src/netinet/sctp_header.h b/netwerk/sctp/src/netinet/sctp_header.h
new file mode 100644
index 0000000000..9d06d66b00
--- /dev/null
+++ b/netwerk/sctp/src/netinet/sctp_header.h
@@ -0,0 +1,595 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
+ * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
+ * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * a) Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *
+ * b) Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the distribution.
+ *
+ * c) Neither the name of Cisco Systems, Inc. nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#if defined(__FreeBSD__) && !defined(__Userspace__)
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+#endif
+
+#ifndef _NETINET_SCTP_HEADER_H_
+#define _NETINET_SCTP_HEADER_H_
+
+#if defined(_WIN32) && !defined(__Userspace__)
+#include <packon.h>
+#endif
+#if !defined(_WIN32)
+#include <sys/time.h>
+#endif
+#include <netinet/sctp.h>
+#include <netinet/sctp_constants.h>
+
+#if !defined(_WIN32)
+#define SCTP_PACKED __attribute__((packed))
+#else
+#pragma pack (push, 1)
+#define SCTP_PACKED
+#endif
+
+/*
+ * Parameter structures
+ */
+struct sctp_ipv4addr_param {
+	struct sctp_paramhdr ph;/* type=SCTP_IPV4_PARAM_TYPE, len=8 */
+	uint32_t addr;		/* IPV4 address */
+} SCTP_PACKED;
+
+#define SCTP_V6_ADDR_BYTES 16
+
+struct sctp_ipv6addr_param {
+	struct sctp_paramhdr ph;/* type=SCTP_IPV6_PARAM_TYPE, len=20 */
+	uint8_t addr[SCTP_V6_ADDR_BYTES];	/* IPV6 address */
+} SCTP_PACKED;
+
+/* Cookie Preservative */
+struct sctp_cookie_perserve_param {
+	struct sctp_paramhdr ph;/* type=SCTP_COOKIE_PRESERVE, len=8 */
+	uint32_t time;		/* time in ms to extend cookie */
+} SCTP_PACKED;
+
+#define SCTP_ARRAY_MIN_LEN 1
+/* Host Name Address */
+struct sctp_host_name_param {
+	struct sctp_paramhdr ph;/* type=SCTP_HOSTNAME_ADDRESS */
+	char name[SCTP_ARRAY_MIN_LEN];		/* host name */
+} SCTP_PACKED;
+
+/*
+ * This is the maximum padded size of a s-a-p
+ * so paramheadr + 3 address types (6 bytes) + 2 byte pad = 12
+ */
+#define SCTP_MAX_ADDR_PARAMS_SIZE 12
+/* supported address type */
+struct sctp_supported_addr_param {
+	struct sctp_paramhdr ph;/* type=SCTP_SUPPORTED_ADDRTYPE */
+	uint16_t addr_type[2];	/* array of supported address types */
+} SCTP_PACKED;
+
+/* heartbeat info parameter */
+struct sctp_heartbeat_info_param {
+	struct sctp_paramhdr ph;
+	uint32_t time_value_1;
+	uint32_t time_value_2;
+	uint32_t random_value1;
+	uint32_t random_value2;
+	uint8_t addr_family;
+	uint8_t addr_len;
+	/* make sure that this structure is 4 byte aligned */
+	uint8_t padding[2];
+	char address[SCTP_ADDRMAX];
+} SCTP_PACKED;
+
+/* draft-ietf-tsvwg-prsctp */
+/* PR-SCTP supported parameter */
+struct sctp_prsctp_supported_param {
+	struct sctp_paramhdr ph;
+} SCTP_PACKED;
+
+/* draft-ietf-tsvwg-addip-sctp */
+struct sctp_asconf_paramhdr {	/* an ASCONF "parameter" */
+	struct sctp_paramhdr ph;/* a SCTP parameter header */
+	uint32_t correlation_id;/* correlation id for this param */
+} SCTP_PACKED;
+
+struct sctp_asconf_addr_param {	/* an ASCONF address parameter */
+	struct sctp_asconf_paramhdr aph;	/* asconf "parameter" */
+	struct sctp_ipv6addr_param addrp;	/* max storage size */
+} SCTP_PACKED;
+
+struct sctp_asconf_tag_param {	/* an ASCONF NAT-Vtag parameter */
+	struct sctp_asconf_paramhdr aph;	/* asconf "parameter" */
+	uint32_t local_vtag;
+	uint32_t remote_vtag;
+} SCTP_PACKED;
+
+struct sctp_asconf_addrv4_param {	/* an ASCONF address (v4) parameter */
+	struct sctp_asconf_paramhdr aph;	/* asconf "parameter" */
+	struct sctp_ipv4addr_param addrp;	/* max storage size */
+} SCTP_PACKED;
+
+#define SCTP_MAX_SUPPORTED_EXT 256
+
+struct sctp_supported_chunk_types_param {
+	struct sctp_paramhdr ph;/* type = 0x8008  len = x */
+	uint8_t chunk_types[];
+} SCTP_PACKED;
+
+/*
+ * Structures for DATA chunks
+ */
+struct sctp_data {
+	uint32_t tsn;
+	uint16_t sid;
+	uint16_t ssn;
+	uint32_t ppid;
+	/* user data follows */
+} SCTP_PACKED;
+
+struct sctp_data_chunk {
+	struct sctp_chunkhdr ch;
+	struct sctp_data dp;
+} SCTP_PACKED;
+
+struct sctp_idata {
+	uint32_t tsn;
+	uint16_t sid;
+	uint16_t reserved;	/* Where does the SSN go? */
+	uint32_t mid;
+	union {
+		uint32_t ppid;
+		uint32_t fsn;	/* Fragment Sequence Number */
+	} ppid_fsn;
+	/* user data follows */
+} SCTP_PACKED;
+
+struct sctp_idata_chunk {
+	struct sctp_chunkhdr ch;
+	struct sctp_idata dp;
+} SCTP_PACKED;
+
+/*
+ * Structures for the control chunks
+ */
+
+/* Initiate (INIT)/Initiate Ack (INIT ACK) */
+struct sctp_init {
+	uint32_t initiate_tag;	/* initiate tag */
+	uint32_t a_rwnd;	/* a_rwnd */
+	uint16_t num_outbound_streams;	/* OS */
+	uint16_t num_inbound_streams;	/* MIS */
+	uint32_t initial_tsn;	/* I-TSN */
+	/* optional param's follow */
+} SCTP_PACKED;
+#define SCTP_IDENTIFICATION_SIZE 16
+#define SCTP_ADDRESS_SIZE 4
+#if defined(__Userspace__)
+#define SCTP_RESERVE_SPACE 5
+#else
+#define SCTP_RESERVE_SPACE 6
+#endif
+/* state cookie header */
+struct sctp_state_cookie {	/* this is our definition... */
+	uint8_t identification[SCTP_IDENTIFICATION_SIZE];/* id of who we are */
+	struct timeval time_entered;	/* the time I built cookie */
+	uint32_t cookie_life;	/* life I will award this cookie */
+	uint32_t tie_tag_my_vtag;	/* my tag in old association */
+
+	uint32_t tie_tag_peer_vtag;	/* peers tag in old association */
+	uint32_t peers_vtag;	/* peers tag in INIT (for quick ref) */
+
+	uint32_t my_vtag;	/* my tag in INIT-ACK (for quick ref) */
+	uint32_t address[SCTP_ADDRESS_SIZE];	/* 4 ints/128 bits */
+	uint32_t addr_type;	/* address type */
+	uint32_t laddress[SCTP_ADDRESS_SIZE];	/* my local from address */
+	uint32_t laddr_type;	/* my local from address type */
+	uint32_t scope_id;	/* v6 scope id for link-locals */
+
+	uint16_t peerport;	/* port address of the peer in the INIT */
+	uint16_t myport;	/* my port address used in the INIT */
+	uint8_t ipv4_addr_legal;/* Are V4 addr legal? */
+	uint8_t ipv6_addr_legal;/* Are V6 addr legal? */
+#if defined(__Userspace__)
+	uint8_t conn_addr_legal;
+#endif
+	uint8_t local_scope;	/* IPv6 local scope flag */
+	uint8_t site_scope;	/* IPv6 site scope flag */
+
+	uint8_t ipv4_scope;	/* IPv4 private addr scope */
+	uint8_t loopback_scope;	/* loopback scope information */
+	uint8_t reserved[SCTP_RESERVE_SPACE];    /* Align to 64 bits */
+	/*
+	 * at the end is tacked on the INIT chunk and the INIT-ACK chunk
+	 * (minus the cookie).
+	 */
+} SCTP_PACKED;
+
+/* state cookie parameter */
+struct sctp_state_cookie_param {
+	struct sctp_paramhdr ph;
+	struct sctp_state_cookie cookie;
+} SCTP_PACKED;
+
+struct sctp_init_chunk {
+	struct sctp_chunkhdr ch;
+	struct sctp_init init;
+} SCTP_PACKED;
+
+struct sctp_init_msg {
+	struct sctphdr sh;
+	struct sctp_init_chunk msg;
+} SCTP_PACKED;
+
+/* ... used for both INIT and INIT ACK */
+#define sctp_init_ack		sctp_init
+#define sctp_init_ack_chunk	sctp_init_chunk
+#define sctp_init_ack_msg	sctp_init_msg
+
+/* Selective Ack (SACK) */
+struct sctp_gap_ack_block {
+	uint16_t start;		/* Gap Ack block start */
+	uint16_t end;		/* Gap Ack block end */
+} SCTP_PACKED;
+
+struct sctp_sack {
+	uint32_t cum_tsn_ack;	/* cumulative TSN Ack */
+	uint32_t a_rwnd;	/* updated a_rwnd of sender */
+	uint16_t num_gap_ack_blks;	/* number of Gap Ack blocks */
+	uint16_t num_dup_tsns;	/* number of duplicate TSNs */
+	/* struct sctp_gap_ack_block's follow */
+	/* uint32_t duplicate_tsn's follow */
+} SCTP_PACKED;
+
+struct sctp_sack_chunk {
+	struct sctp_chunkhdr ch;
+	struct sctp_sack sack;
+} SCTP_PACKED;
+
+struct sctp_nr_sack {
+	uint32_t cum_tsn_ack;	/* cumulative TSN Ack */
+	uint32_t a_rwnd;	/* updated a_rwnd of sender */
+	uint16_t num_gap_ack_blks;	/* number of Gap Ack blocks */
+	uint16_t num_nr_gap_ack_blks;	/* number of NR Gap Ack blocks */
+	uint16_t num_dup_tsns;	/* number of duplicate TSNs */
+	uint16_t reserved;	/* not currently used*/
+	/* struct sctp_gap_ack_block's follow */
+	/* uint32_t duplicate_tsn's follow */
+} SCTP_PACKED;
+
+struct sctp_nr_sack_chunk {
+	struct sctp_chunkhdr ch;
+	struct sctp_nr_sack nr_sack;
+} SCTP_PACKED;
+
+/* Heartbeat Request (HEARTBEAT) */
+struct sctp_heartbeat {
+	struct sctp_heartbeat_info_param hb_info;
+} SCTP_PACKED;
+
+struct sctp_heartbeat_chunk {
+	struct sctp_chunkhdr ch;
+	struct sctp_heartbeat heartbeat;
+} SCTP_PACKED;
+
+/* ... used for Heartbeat Ack (HEARTBEAT ACK) */
+#define sctp_heartbeat_ack		sctp_heartbeat
+#define sctp_heartbeat_ack_chunk	sctp_heartbeat_chunk
+
+/* Abort Asssociation (ABORT) */
+struct sctp_abort_chunk {
+	struct sctp_chunkhdr ch;
+	/* optional error cause may follow */
+} SCTP_PACKED;
+
+struct sctp_abort_msg {
+	struct sctphdr sh;
+	struct sctp_abort_chunk msg;
+} SCTP_PACKED;
+
+/* Shutdown Association (SHUTDOWN) */
+struct sctp_shutdown_chunk {
+	struct sctp_chunkhdr ch;
+	uint32_t cumulative_tsn_ack;
+} SCTP_PACKED;
+
+/* Shutdown Acknowledgment (SHUTDOWN ACK) */
+struct sctp_shutdown_ack_chunk {
+	struct sctp_chunkhdr ch;
+} SCTP_PACKED;
+
+/* Operation Error (ERROR) */
+struct sctp_error_chunk {
+	struct sctp_chunkhdr ch;
+	/* optional error causes follow */
+} SCTP_PACKED;
+
+/* Cookie Echo (COOKIE ECHO) */
+struct sctp_cookie_echo_chunk {
+	struct sctp_chunkhdr ch;
+	struct sctp_state_cookie cookie;
+} SCTP_PACKED;
+
+/* Cookie Acknowledgment (COOKIE ACK) */
+struct sctp_cookie_ack_chunk {
+	struct sctp_chunkhdr ch;
+} SCTP_PACKED;
+
+/* Explicit Congestion Notification Echo (ECNE) */
+struct old_sctp_ecne_chunk {
+	struct sctp_chunkhdr ch;
+	uint32_t tsn;
+} SCTP_PACKED;
+
+struct sctp_ecne_chunk {
+	struct sctp_chunkhdr ch;
+	uint32_t tsn;
+	uint32_t num_pkts_since_cwr;
+} SCTP_PACKED;
+
+/* Congestion Window Reduced (CWR) */
+struct sctp_cwr_chunk {
+	struct sctp_chunkhdr ch;
+	uint32_t tsn;
+} SCTP_PACKED;
+
+/* Shutdown Complete (SHUTDOWN COMPLETE) */
+struct sctp_shutdown_complete_chunk {
+	struct sctp_chunkhdr ch;
+} SCTP_PACKED;
+
+struct sctp_adaptation_layer_indication {
+	struct sctp_paramhdr ph;
+	uint32_t indication;
+} SCTP_PACKED;
+
+/*
+ * draft-ietf-tsvwg-addip-sctp
+ */
+/* Address/Stream Configuration Change (ASCONF) */
+struct sctp_asconf_chunk {
+	struct sctp_chunkhdr ch;
+	uint32_t serial_number;
+	/* lookup address parameter (mandatory) */
+	/* asconf parameters follow */
+} SCTP_PACKED;
+
+/* Address/Stream Configuration Acknowledge (ASCONF ACK) */
+struct sctp_asconf_ack_chunk {
+	struct sctp_chunkhdr ch;
+	uint32_t serial_number;
+	/* asconf parameters follow */
+} SCTP_PACKED;
+
+/* draft-ietf-tsvwg-prsctp */
+/* Forward Cumulative TSN (FORWARD TSN) */
+struct sctp_forward_tsn_chunk {
+	struct sctp_chunkhdr ch;
+	uint32_t new_cumulative_tsn;
+	/* stream/sequence pairs (sctp_strseq) follow */
+} SCTP_PACKED;
+
+struct sctp_strseq {
+	uint16_t sid;
+	uint16_t ssn;
+} SCTP_PACKED;
+
+struct sctp_strseq_mid {
+	uint16_t sid;
+	uint16_t flags;
+	uint32_t mid;
+};
+
+struct sctp_forward_tsn_msg {
+	struct sctphdr sh;
+	struct sctp_forward_tsn_chunk msg;
+} SCTP_PACKED;
+
+/* should be a multiple of 4 - 1 aka 3/7/11 etc. */
+
+#define SCTP_NUM_DB_TO_VERIFY 31
+
+struct sctp_chunk_desc {
+	uint8_t chunk_type;
+	uint8_t data_bytes[SCTP_NUM_DB_TO_VERIFY];
+	uint32_t tsn_ifany;
+} SCTP_PACKED;
+
+struct sctp_pktdrop_chunk {
+	struct sctp_chunkhdr ch;
+	uint32_t bottle_bw;
+	uint32_t current_onq;
+	uint16_t trunc_len;
+	uint16_t reserved;
+	uint8_t data[];
+} SCTP_PACKED;
+
+/**********STREAM RESET STUFF ******************/
+
+struct sctp_stream_reset_request {
+	struct sctp_paramhdr ph;
+	uint32_t request_seq;
+} SCTP_PACKED;
+
+struct sctp_stream_reset_out_request {
+	struct sctp_paramhdr ph;
+	uint32_t request_seq;	/* monotonically increasing seq no */
+	uint32_t response_seq;	/* if a response, the resp seq no */
+	uint32_t send_reset_at_tsn;	/* last TSN I assigned outbound */
+	uint16_t list_of_streams[];	/* if not all list of streams */
+} SCTP_PACKED;
+
+struct sctp_stream_reset_in_request {
+	struct sctp_paramhdr ph;
+	uint32_t request_seq;
+	uint16_t list_of_streams[];	/* if not all list of streams */
+} SCTP_PACKED;
+
+struct sctp_stream_reset_tsn_request {
+	struct sctp_paramhdr ph;
+	uint32_t request_seq;
+} SCTP_PACKED;
+
+struct sctp_stream_reset_response {
+	struct sctp_paramhdr ph;
+	uint32_t response_seq;	/* if a response, the resp seq no */
+	uint32_t result;
+} SCTP_PACKED;
+
+struct sctp_stream_reset_response_tsn {
+	struct sctp_paramhdr ph;
+	uint32_t response_seq;	/* if a response, the resp seq no */
+	uint32_t result;
+	uint32_t senders_next_tsn;
+	uint32_t receivers_next_tsn;
+} SCTP_PACKED;
+
+struct sctp_stream_reset_add_strm {
+	struct sctp_paramhdr ph;
+	uint32_t request_seq;
+	uint16_t number_of_streams;
+	uint16_t reserved;
+} SCTP_PACKED;
+
+#define SCTP_STREAM_RESET_RESULT_NOTHING_TO_DO   0x00000000 /* XXX: unused */
+#define SCTP_STREAM_RESET_RESULT_PERFORMED       0x00000001
+#define SCTP_STREAM_RESET_RESULT_DENIED          0x00000002
+#define SCTP_STREAM_RESET_RESULT_ERR__WRONG_SSN  0x00000003 /* XXX: unused */
+#define SCTP_STREAM_RESET_RESULT_ERR_IN_PROGRESS 0x00000004
+#define SCTP_STREAM_RESET_RESULT_ERR_BAD_SEQNO   0x00000005
+#define SCTP_STREAM_RESET_RESULT_IN_PROGRESS     0x00000006 /* XXX: unused */
+
+/*
+ * convience structures, note that if you are making a request for specific
+ * streams then the request will need to be an overlay structure.
+ */
+
+struct sctp_stream_reset_tsn_req {
+	struct sctp_chunkhdr ch;
+	struct sctp_stream_reset_tsn_request sr_req;
+} SCTP_PACKED;
+
+struct sctp_stream_reset_resp {
+	struct sctp_chunkhdr ch;
+	struct sctp_stream_reset_response sr_resp;
+} SCTP_PACKED;
+
+/* respone only valid with a TSN request */
+struct sctp_stream_reset_resp_tsn {
+	struct sctp_chunkhdr ch;
+	struct sctp_stream_reset_response_tsn sr_resp;
+} SCTP_PACKED;
+
+/****************************************************/
+
+/*
+ * Authenticated chunks support draft-ietf-tsvwg-sctp-auth
+ */
+
+/* Should we make the max be 32? */
+#define SCTP_RANDOM_MAX_SIZE 256
+struct sctp_auth_random {
+	struct sctp_paramhdr ph;/* type = 0x8002 */
+	uint8_t random_data[];
+} SCTP_PACKED;
+
+struct sctp_auth_chunk_list {
+	struct sctp_paramhdr ph;/* type = 0x8003 */
+	uint8_t chunk_types[];
+} SCTP_PACKED;
+
+struct sctp_auth_hmac_algo {
+	struct sctp_paramhdr ph;/* type = 0x8004 */
+	uint16_t hmac_ids[];
+} SCTP_PACKED;
+
+struct sctp_auth_chunk {
+	struct sctp_chunkhdr ch;
+	uint16_t shared_key_id;
+	uint16_t hmac_id;
+	uint8_t hmac[];
+} SCTP_PACKED;
+
+/*
+ * we pre-reserve enough room for a ECNE or CWR AND a SACK with no missing
+ * pieces. If ENCE is missing we could have a couple of blocks. This way we
+ * optimize so we MOST likely can bundle a SACK/ECN with the smallest size
+ * data chunk I will split into. We could increase throughput slightly by
+ * taking out these two but the  24-sack/8-CWR i.e. 32 bytes I pre-reserve I
+ * feel is worth it for now.
+ */
+#ifndef SCTP_MAX_OVERHEAD
+#ifdef INET6
+#define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
+                           sizeof(struct sctphdr) + \
+                           sizeof(struct sctp_ecne_chunk) + \
+                           sizeof(struct sctp_sack_chunk) + \
+                           sizeof(struct ip6_hdr))
+
+#define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
+                           sizeof(struct sctphdr) + \
+                           sizeof(struct ip6_hdr))
+
+#define SCTP_MIN_OVERHEAD (sizeof(struct ip6_hdr) + \
+                           sizeof(struct sctphdr))
+
+#else
+#define SCTP_MAX_OVERHEAD (sizeof(struct sctp_data_chunk) + \
+                           sizeof(struct sctphdr) + \
+                           sizeof(struct sctp_ecne_chunk) + \
+                           sizeof(struct sctp_sack_chunk) + \
+                           sizeof(struct ip))
+
+#define SCTP_MED_OVERHEAD (sizeof(struct sctp_data_chunk) + \
+                           sizeof(struct sctphdr) + \
+                           sizeof(struct ip))
+
+#define SCTP_MIN_OVERHEAD (sizeof(struct ip) + \
+                           sizeof(struct sctphdr))
+
+#endif /* INET6 */
+#endif /* !SCTP_MAX_OVERHEAD */
+
+#define SCTP_MED_V4_OVERHEAD (sizeof(struct sctp_data_chunk) + \
+                              sizeof(struct sctphdr) + \
+                              sizeof(struct ip))
+
+#define SCTP_MIN_V4_OVERHEAD (sizeof(struct ip) + \
+                              sizeof(struct sctphdr))
+
+#if defined(_WIN32) && !defined(__Userspace__)
+#include <packoff.h>
+#endif
+#if defined(_WIN32) && defined(__Userspace__)
+#pragma pack(pop)
+#endif
+#undef SCTP_PACKED
+#endif				/* !__sctp_header_h__ */