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+/* SCTP kernel reference Implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ * Copyright (c) 2001 Nokia, Inc.
+ * Copyright (c) 2001 La Monte H.P. Yarroll
+ *
+ * This file is part of the SCTP kernel reference Implementation
+ *
+ * Various protocol defined structures.
+ *
+ * This SCTP implementation 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, or (at your option)
+ * any later version.
+ *
+ * This SCTP implementation 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 GNU CC; see the file COPYING. If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ * lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * Or submit a bug report through the following website:
+ * http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ * La Monte H.P. Yarroll <piggy@acm.org>
+ * Karl Knutson <karl@athena.chicago.il.us>
+ * Jon Grimm <jgrimm@us.ibm.com>
+ * Xingang Guo <xingang.guo@intel.com>
+ * randall@sctp.chicago.il.us
+ * kmorneau@cisco.com
+ * qxie1@email.mot.com
+ * Sridhar Samudrala <sri@us.ibm.com>
+ * Kevin Gao <kevin.gao@intel.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+#ifndef __LINUX_SCTP_H__
+#define __LINUX_SCTP_H__
+
+#include <linux/in.h> /* We need in_addr. */
+#include <linux/in6.h> /* We need in6_addr. */
+#include <linux/skbuff.h>
+
+#include <uapi/linux/sctp.h>
+
+/* Section 3.1. SCTP Common Header Format */
+typedef struct sctphdr {
+ __be16 source;
+ __be16 dest;
+ __be32 vtag;
+ __le32 checksum;
+} __packed sctp_sctphdr_t;
+
+static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb)
+{
+ return (struct sctphdr *)skb_transport_header(skb);
+}
+
+/* Section 3.2. Chunk Field Descriptions. */
+typedef struct sctp_chunkhdr {
+ __u8 type;
+ __u8 flags;
+ __be16 length;
+} __packed sctp_chunkhdr_t;
+
+
+/* Section 3.2. Chunk Type Values.
+ * [Chunk Type] identifies the type of information contained in the Chunk
+ * Value field. It takes a value from 0 to 254. The value of 255 is
+ * reserved for future use as an extension field.
+ */
+typedef enum {
+ SCTP_CID_DATA = 0,
+ SCTP_CID_INIT = 1,
+ SCTP_CID_INIT_ACK = 2,
+ SCTP_CID_SACK = 3,
+ SCTP_CID_HEARTBEAT = 4,
+ SCTP_CID_HEARTBEAT_ACK = 5,
+ SCTP_CID_ABORT = 6,
+ SCTP_CID_SHUTDOWN = 7,
+ SCTP_CID_SHUTDOWN_ACK = 8,
+ SCTP_CID_ERROR = 9,
+ SCTP_CID_COOKIE_ECHO = 10,
+ SCTP_CID_COOKIE_ACK = 11,
+ SCTP_CID_ECN_ECNE = 12,
+ SCTP_CID_ECN_CWR = 13,
+ SCTP_CID_SHUTDOWN_COMPLETE = 14,
+
+ /* AUTH Extension Section 4.1 */
+ SCTP_CID_AUTH = 0x0F,
+
+ /* PR-SCTP Sec 3.2 */
+ SCTP_CID_FWD_TSN = 0xC0,
+
+ /* Use hex, as defined in ADDIP sec. 3.1 */
+ SCTP_CID_ASCONF = 0xC1,
+ SCTP_CID_ASCONF_ACK = 0x80,
+} sctp_cid_t; /* enum */
+
+
+/* Section 3.2
+ * Chunk Types are encoded such that the highest-order two bits specify
+ * the action that must be taken if the processing endpoint does not
+ * recognize the Chunk Type.
+ */
+typedef enum {
+ SCTP_CID_ACTION_DISCARD = 0x00,
+ SCTP_CID_ACTION_DISCARD_ERR = 0x40,
+ SCTP_CID_ACTION_SKIP = 0x80,
+ SCTP_CID_ACTION_SKIP_ERR = 0xc0,
+} sctp_cid_action_t;
+
+enum { SCTP_CID_ACTION_MASK = 0xc0, };
+
+/* This flag is used in Chunk Flags for ABORT and SHUTDOWN COMPLETE.
+ *
+ * 3.3.7 Abort Association (ABORT) (6):
+ * The T bit is set to 0 if the sender had a TCB that it destroyed.
+ * If the sender did not have a TCB it should set this bit to 1.
+ */
+enum { SCTP_CHUNK_FLAG_T = 0x01 };
+
+/*
+ * Set the T bit
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Type = 14 |Reserved |T| Length = 4 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Chunk Flags: 8 bits
+ *
+ * Reserved: 7 bits
+ * Set to 0 on transmit and ignored on receipt.
+ *
+ * T bit: 1 bit
+ * The T bit is set to 0 if the sender had a TCB that it destroyed. If
+ * the sender did NOT have a TCB it should set this bit to 1.
+ *
+ * Note: Special rules apply to this chunk for verification, please
+ * see Section 8.5.1 for details.
+ */
+
+#define sctp_test_T_bit(c) ((c)->chunk_hdr->flags & SCTP_CHUNK_FLAG_T)
+
+/* RFC 2960
+ * Section 3.2.1 Optional/Variable-length Parmaeter Format.
+ */
+
+typedef struct sctp_paramhdr {
+ __be16 type;
+ __be16 length;
+} __packed sctp_paramhdr_t;
+
+typedef enum {
+
+ /* RFC 2960 Section 3.3.5 */
+ SCTP_PARAM_HEARTBEAT_INFO = cpu_to_be16(1),
+ /* RFC 2960 Section 3.3.2.1 */
+ SCTP_PARAM_IPV4_ADDRESS = cpu_to_be16(5),
+ SCTP_PARAM_IPV6_ADDRESS = cpu_to_be16(6),
+ SCTP_PARAM_STATE_COOKIE = cpu_to_be16(7),
+ SCTP_PARAM_UNRECOGNIZED_PARAMETERS = cpu_to_be16(8),
+ SCTP_PARAM_COOKIE_PRESERVATIVE = cpu_to_be16(9),
+ SCTP_PARAM_HOST_NAME_ADDRESS = cpu_to_be16(11),
+ SCTP_PARAM_SUPPORTED_ADDRESS_TYPES = cpu_to_be16(12),
+ SCTP_PARAM_ECN_CAPABLE = cpu_to_be16(0x8000),
+
+ /* AUTH Extension Section 3 */
+ SCTP_PARAM_RANDOM = cpu_to_be16(0x8002),
+ SCTP_PARAM_CHUNKS = cpu_to_be16(0x8003),
+ SCTP_PARAM_HMAC_ALGO = cpu_to_be16(0x8004),
+
+ /* Add-IP: Supported Extensions, Section 4.2 */
+ SCTP_PARAM_SUPPORTED_EXT = cpu_to_be16(0x8008),
+
+ /* PR-SCTP Sec 3.1 */
+ SCTP_PARAM_FWD_TSN_SUPPORT = cpu_to_be16(0xc000),
+
+ /* Add-IP Extension. Section 3.2 */
+ SCTP_PARAM_ADD_IP = cpu_to_be16(0xc001),
+ SCTP_PARAM_DEL_IP = cpu_to_be16(0xc002),
+ SCTP_PARAM_ERR_CAUSE = cpu_to_be16(0xc003),
+ SCTP_PARAM_SET_PRIMARY = cpu_to_be16(0xc004),
+ SCTP_PARAM_SUCCESS_REPORT = cpu_to_be16(0xc005),
+ SCTP_PARAM_ADAPTATION_LAYER_IND = cpu_to_be16(0xc006),
+
+} sctp_param_t; /* enum */
+
+
+/* RFC 2960 Section 3.2.1
+ * The Parameter Types are encoded such that the highest-order two bits
+ * specify the action that must be taken if the processing endpoint does
+ * not recognize the Parameter Type.
+ *
+ */
+typedef enum {
+ SCTP_PARAM_ACTION_DISCARD = cpu_to_be16(0x0000),
+ SCTP_PARAM_ACTION_DISCARD_ERR = cpu_to_be16(0x4000),
+ SCTP_PARAM_ACTION_SKIP = cpu_to_be16(0x8000),
+ SCTP_PARAM_ACTION_SKIP_ERR = cpu_to_be16(0xc000),
+} sctp_param_action_t;
+
+enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), };
+
+/* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
+
+typedef struct sctp_datahdr {
+ __be32 tsn;
+ __be16 stream;
+ __be16 ssn;
+ __be32 ppid;
+ __u8 payload[0];
+} __packed sctp_datahdr_t;
+
+typedef struct sctp_data_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_datahdr_t data_hdr;
+} __packed sctp_data_chunk_t;
+
+/* DATA Chuck Specific Flags */
+enum {
+ SCTP_DATA_MIDDLE_FRAG = 0x00,
+ SCTP_DATA_LAST_FRAG = 0x01,
+ SCTP_DATA_FIRST_FRAG = 0x02,
+ SCTP_DATA_NOT_FRAG = 0x03,
+ SCTP_DATA_UNORDERED = 0x04,
+ SCTP_DATA_SACK_IMM = 0x08,
+};
+enum { SCTP_DATA_FRAG_MASK = 0x03, };
+
+
+/* RFC 2960 Section 3.3.2 Initiation (INIT) (1)
+ *
+ * This chunk is used to initiate a SCTP association between two
+ * endpoints.
+ */
+typedef struct sctp_inithdr {
+ __be32 init_tag;
+ __be32 a_rwnd;
+ __be16 num_outbound_streams;
+ __be16 num_inbound_streams;
+ __be32 initial_tsn;
+ __u8 params[0];
+} __packed sctp_inithdr_t;
+
+typedef struct sctp_init_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_inithdr_t init_hdr;
+} __packed sctp_init_chunk_t;
+
+
+/* Section 3.3.2.1. IPv4 Address Parameter (5) */
+typedef struct sctp_ipv4addr_param {
+ sctp_paramhdr_t param_hdr;
+ struct in_addr addr;
+} __packed sctp_ipv4addr_param_t;
+
+/* Section 3.3.2.1. IPv6 Address Parameter (6) */
+typedef struct sctp_ipv6addr_param {
+ sctp_paramhdr_t param_hdr;
+ struct in6_addr addr;
+} __packed sctp_ipv6addr_param_t;
+
+/* Section 3.3.2.1 Cookie Preservative (9) */
+typedef struct sctp_cookie_preserve_param {
+ sctp_paramhdr_t param_hdr;
+ __be32 lifespan_increment;
+} __packed sctp_cookie_preserve_param_t;
+
+/* Section 3.3.2.1 Host Name Address (11) */
+typedef struct sctp_hostname_param {
+ sctp_paramhdr_t param_hdr;
+ uint8_t hostname[0];
+} __packed sctp_hostname_param_t;
+
+/* Section 3.3.2.1 Supported Address Types (12) */
+typedef struct sctp_supported_addrs_param {
+ sctp_paramhdr_t param_hdr;
+ __be16 types[0];
+} __packed sctp_supported_addrs_param_t;
+
+/* Appendix A. ECN Capable (32768) */
+typedef struct sctp_ecn_capable_param {
+ sctp_paramhdr_t param_hdr;
+} __packed sctp_ecn_capable_param_t;
+
+/* ADDIP Section 3.2.6 Adaptation Layer Indication */
+typedef struct sctp_adaptation_ind_param {
+ struct sctp_paramhdr param_hdr;
+ __be32 adaptation_ind;
+} __packed sctp_adaptation_ind_param_t;
+
+/* ADDIP Section 4.2.7 Supported Extensions Parameter */
+typedef struct sctp_supported_ext_param {
+ struct sctp_paramhdr param_hdr;
+ __u8 chunks[0];
+} __packed sctp_supported_ext_param_t;
+
+/* AUTH Section 3.1 Random */
+typedef struct sctp_random_param {
+ sctp_paramhdr_t param_hdr;
+ __u8 random_val[0];
+} __packed sctp_random_param_t;
+
+/* AUTH Section 3.2 Chunk List */
+typedef struct sctp_chunks_param {
+ sctp_paramhdr_t param_hdr;
+ __u8 chunks[0];
+} __packed sctp_chunks_param_t;
+
+/* AUTH Section 3.3 HMAC Algorithm */
+typedef struct sctp_hmac_algo_param {
+ sctp_paramhdr_t param_hdr;
+ __be16 hmac_ids[0];
+} __packed sctp_hmac_algo_param_t;
+
+/* RFC 2960. Section 3.3.3 Initiation Acknowledgement (INIT ACK) (2):
+ * The INIT ACK chunk is used to acknowledge the initiation of an SCTP
+ * association.
+ */
+typedef sctp_init_chunk_t sctp_initack_chunk_t;
+
+/* Section 3.3.3.1 State Cookie (7) */
+typedef struct sctp_cookie_param {
+ sctp_paramhdr_t p;
+ __u8 body[0];
+} __packed sctp_cookie_param_t;
+
+/* Section 3.3.3.1 Unrecognized Parameters (8) */
+typedef struct sctp_unrecognized_param {
+ sctp_paramhdr_t param_hdr;
+ sctp_paramhdr_t unrecognized;
+} __packed sctp_unrecognized_param_t;
+
+
+
+/*
+ * 3.3.4 Selective Acknowledgement (SACK) (3):
+ *
+ * This chunk is sent to the peer endpoint to acknowledge received DATA
+ * chunks and to inform the peer endpoint of gaps in the received
+ * subsequences of DATA chunks as represented by their TSNs.
+ */
+
+typedef struct sctp_gap_ack_block {
+ __be16 start;
+ __be16 end;
+} __packed sctp_gap_ack_block_t;
+
+typedef __be32 sctp_dup_tsn_t;
+
+typedef union {
+ sctp_gap_ack_block_t gab;
+ sctp_dup_tsn_t dup;
+} sctp_sack_variable_t;
+
+typedef struct sctp_sackhdr {
+ __be32 cum_tsn_ack;
+ __be32 a_rwnd;
+ __be16 num_gap_ack_blocks;
+ __be16 num_dup_tsns;
+ sctp_sack_variable_t variable[0];
+} __packed sctp_sackhdr_t;
+
+typedef struct sctp_sack_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_sackhdr_t sack_hdr;
+} __packed sctp_sack_chunk_t;
+
+
+/* RFC 2960. Section 3.3.5 Heartbeat Request (HEARTBEAT) (4):
+ *
+ * An endpoint should send this chunk to its peer endpoint to probe the
+ * reachability of a particular destination transport address defined in
+ * the present association.
+ */
+
+typedef struct sctp_heartbeathdr {
+ sctp_paramhdr_t info;
+} __packed sctp_heartbeathdr_t;
+
+typedef struct sctp_heartbeat_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_heartbeathdr_t hb_hdr;
+} __packed sctp_heartbeat_chunk_t;
+
+
+/* For the abort and shutdown ACK we must carry the init tag in the
+ * common header. Just the common header is all that is needed with a
+ * chunk descriptor.
+ */
+typedef struct sctp_abort_chunk {
+ sctp_chunkhdr_t uh;
+} __packed sctp_abort_chunk_t;
+
+
+/* For the graceful shutdown we must carry the tag (in common header)
+ * and the highest consecutive acking value.
+ */
+typedef struct sctp_shutdownhdr {
+ __be32 cum_tsn_ack;
+} __packed sctp_shutdownhdr_t;
+
+struct sctp_shutdown_chunk_t {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_shutdownhdr_t shutdown_hdr;
+} __packed;
+
+/* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */
+
+typedef struct sctp_errhdr {
+ __be16 cause;
+ __be16 length;
+ __u8 variable[0];
+} __packed sctp_errhdr_t;
+
+typedef struct sctp_operr_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_errhdr_t err_hdr;
+} __packed sctp_operr_chunk_t;
+
+/* RFC 2960 3.3.10 - Operation Error
+ *
+ * Cause Code: 16 bits (unsigned integer)
+ *
+ * Defines the type of error conditions being reported.
+ * Cause Code
+ * Value Cause Code
+ * --------- ----------------
+ * 1 Invalid Stream Identifier
+ * 2 Missing Mandatory Parameter
+ * 3 Stale Cookie Error
+ * 4 Out of Resource
+ * 5 Unresolvable Address
+ * 6 Unrecognized Chunk Type
+ * 7 Invalid Mandatory Parameter
+ * 8 Unrecognized Parameters
+ * 9 No User Data
+ * 10 Cookie Received While Shutting Down
+ */
+typedef enum {
+
+ SCTP_ERROR_NO_ERROR = cpu_to_be16(0x00),
+ SCTP_ERROR_INV_STRM = cpu_to_be16(0x01),
+ SCTP_ERROR_MISS_PARAM = cpu_to_be16(0x02),
+ SCTP_ERROR_STALE_COOKIE = cpu_to_be16(0x03),
+ SCTP_ERROR_NO_RESOURCE = cpu_to_be16(0x04),
+ SCTP_ERROR_DNS_FAILED = cpu_to_be16(0x05),
+ SCTP_ERROR_UNKNOWN_CHUNK = cpu_to_be16(0x06),
+ SCTP_ERROR_INV_PARAM = cpu_to_be16(0x07),
+ SCTP_ERROR_UNKNOWN_PARAM = cpu_to_be16(0x08),
+ SCTP_ERROR_NO_DATA = cpu_to_be16(0x09),
+ SCTP_ERROR_COOKIE_IN_SHUTDOWN = cpu_to_be16(0x0a),
+
+
+ /* SCTP Implementation Guide:
+ * 11 Restart of an association with new addresses
+ * 12 User Initiated Abort
+ * 13 Protocol Violation
+ */
+
+ SCTP_ERROR_RESTART = cpu_to_be16(0x0b),
+ SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c),
+ SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d),
+
+ /* ADDIP Section 3.3 New Error Causes
+ *
+ * Four new Error Causes are added to the SCTP Operational Errors,
+ * primarily for use in the ASCONF-ACK chunk.
+ *
+ * Value Cause Code
+ * --------- ----------------
+ * 0x00A0 Request to Delete Last Remaining IP Address.
+ * 0x00A1 Operation Refused Due to Resource Shortage.
+ * 0x00A2 Request to Delete Source IP Address.
+ * 0x00A3 Association Aborted due to illegal ASCONF-ACK
+ * 0x00A4 Request refused - no authorization.
+ */
+ SCTP_ERROR_DEL_LAST_IP = cpu_to_be16(0x00A0),
+ SCTP_ERROR_RSRC_LOW = cpu_to_be16(0x00A1),
+ SCTP_ERROR_DEL_SRC_IP = cpu_to_be16(0x00A2),
+ SCTP_ERROR_ASCONF_ACK = cpu_to_be16(0x00A3),
+ SCTP_ERROR_REQ_REFUSED = cpu_to_be16(0x00A4),
+
+ /* AUTH Section 4. New Error Cause
+ *
+ * This section defines a new error cause that will be sent if an AUTH
+ * chunk is received with an unsupported HMAC identifier.
+ * illustrates the new error cause.
+ *
+ * Cause Code Error Cause Name
+ * --------------------------------------------------------------
+ * 0x0105 Unsupported HMAC Identifier
+ */
+ SCTP_ERROR_UNSUP_HMAC = cpu_to_be16(0x0105)
+} sctp_error_t;
+
+
+
+/* RFC 2960. Appendix A. Explicit Congestion Notification.
+ * Explicit Congestion Notification Echo (ECNE) (12)
+ */
+typedef struct sctp_ecnehdr {
+ __be32 lowest_tsn;
+} sctp_ecnehdr_t;
+
+typedef struct sctp_ecne_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_ecnehdr_t ence_hdr;
+} __packed sctp_ecne_chunk_t;
+
+/* RFC 2960. Appendix A. Explicit Congestion Notification.
+ * Congestion Window Reduced (CWR) (13)
+ */
+typedef struct sctp_cwrhdr {
+ __be32 lowest_tsn;
+} sctp_cwrhdr_t;
+
+typedef struct sctp_cwr_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_cwrhdr_t cwr_hdr;
+} __packed sctp_cwr_chunk_t;
+
+/* PR-SCTP
+ * 3.2 Forward Cumulative TSN Chunk Definition (FORWARD TSN)
+ *
+ * Forward Cumulative TSN chunk has the following format:
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Type = 192 | Flags = 0x00 | Length = Variable |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | New Cumulative TSN |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Stream-1 | Stream Sequence-1 |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * \ /
+ * / \
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Stream-N | Stream Sequence-N |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Chunk Flags:
+ *
+ * Set to all zeros on transmit and ignored on receipt.
+ *
+ * New Cumulative TSN: 32 bit u_int
+ *
+ * This indicates the new cumulative TSN to the data receiver. Upon
+ * the reception of this value, the data receiver MUST consider
+ * any missing TSNs earlier than or equal to this value as received
+ * and stop reporting them as gaps in any subsequent SACKs.
+ *
+ * Stream-N: 16 bit u_int
+ *
+ * This field holds a stream number that was skipped by this
+ * FWD-TSN.
+ *
+ * Stream Sequence-N: 16 bit u_int
+ * This field holds the sequence number associated with the stream
+ * that was skipped. The stream sequence field holds the largest stream
+ * sequence number in this stream being skipped. The receiver of
+ * the FWD-TSN's can use the Stream-N and Stream Sequence-N fields
+ * to enable delivery of any stranded TSN's that remain on the stream
+ * re-ordering queues. This field MUST NOT report TSN's corresponding
+ * to DATA chunk that are marked as unordered. For ordered DATA
+ * chunks this field MUST be filled in.
+ */
+struct sctp_fwdtsn_skip {
+ __be16 stream;
+ __be16 ssn;
+} __packed;
+
+struct sctp_fwdtsn_hdr {
+ __be32 new_cum_tsn;
+ struct sctp_fwdtsn_skip skip[0];
+} __packed;
+
+struct sctp_fwdtsn_chunk {
+ struct sctp_chunkhdr chunk_hdr;
+ struct sctp_fwdtsn_hdr fwdtsn_hdr;
+} __packed;
+
+
+/* ADDIP
+ * Section 3.1.1 Address Configuration Change Chunk (ASCONF)
+ *
+ * Serial Number: 32 bits (unsigned integer)
+ * This value represents a Serial Number for the ASCONF Chunk. The
+ * valid range of Serial Number is from 0 to 2^32-1.
+ * Serial Numbers wrap back to 0 after reaching 2^32 -1.
+ *
+ * Address Parameter: 8 or 20 bytes (depending on type)
+ * The address is an address of the sender of the ASCONF chunk,
+ * the address MUST be considered part of the association by the
+ * peer endpoint. This field may be used by the receiver of the
+ * ASCONF to help in finding the association. This parameter MUST
+ * be present in every ASCONF message i.e. it is a mandatory TLV
+ * parameter.
+ *
+ * ASCONF Parameter: TLV format
+ * Each Address configuration change is represented by a TLV
+ * parameter as defined in Section 3.2. One or more requests may
+ * be present in an ASCONF Chunk.
+ *
+ * Section 3.1.2 Address Configuration Acknowledgement Chunk (ASCONF-ACK)
+ *
+ * Serial Number: 32 bits (unsigned integer)
+ * This value represents the Serial Number for the received ASCONF
+ * Chunk that is acknowledged by this chunk. This value is copied
+ * from the received ASCONF Chunk.
+ *
+ * ASCONF Parameter Response: TLV format
+ * The ASCONF Parameter Response is used in the ASCONF-ACK to
+ * report status of ASCONF processing.
+ */
+typedef struct sctp_addip_param {
+ sctp_paramhdr_t param_hdr;
+ __be32 crr_id;
+} __packed sctp_addip_param_t;
+
+typedef struct sctp_addiphdr {
+ __be32 serial;
+ __u8 params[0];
+} __packed sctp_addiphdr_t;
+
+typedef struct sctp_addip_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_addiphdr_t addip_hdr;
+} __packed sctp_addip_chunk_t;
+
+/* AUTH
+ * Section 4.1 Authentication Chunk (AUTH)
+ *
+ * This chunk is used to hold the result of the HMAC calculation.
+ *
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Type = 0x0F | Flags=0 | Length |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | Shared Key Identifier | HMAC Identifier |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * | |
+ * \ HMAC /
+ * / \
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Type: 1 byte (unsigned integer)
+ * This value MUST be set to 0x0F for all AUTH-chunks.
+ *
+ * Flags: 1 byte (unsigned integer)
+ * Set to zero on transmit and ignored on receipt.
+ *
+ * Length: 2 bytes (unsigned integer)
+ * This value holds the length of the HMAC in bytes plus 8.
+ *
+ * Shared Key Identifier: 2 bytes (unsigned integer)
+ * This value describes which endpoint pair shared key is used.
+ *
+ * HMAC Identifier: 2 bytes (unsigned integer)
+ * This value describes which message digest is being used. Table 2
+ * shows the currently defined values.
+ *
+ * The following Table 2 shows the currently defined values for HMAC
+ * identifiers.
+ *
+ * +-----------------+--------------------------+
+ * | HMAC Identifier | Message Digest Algorithm |
+ * +-----------------+--------------------------+
+ * | 0 | Reserved |
+ * | 1 | SHA-1 defined in [8] |
+ * | 2 | Reserved |
+ * | 3 | SHA-256 defined in [8] |
+ * +-----------------+--------------------------+
+ *
+ *
+ * HMAC: n bytes (unsigned integer) This hold the result of the HMAC
+ * calculation.
+ */
+typedef struct sctp_authhdr {
+ __be16 shkey_id;
+ __be16 hmac_id;
+ __u8 hmac[0];
+} __packed sctp_authhdr_t;
+
+typedef struct sctp_auth_chunk {
+ sctp_chunkhdr_t chunk_hdr;
+ sctp_authhdr_t auth_hdr;
+} __packed sctp_auth_chunk_t;
+
+#endif /* __LINUX_SCTP_H__ */