1 files changed, 594 insertions, 0 deletions

diff --git a/include/linux/sctp.h b/include/linux/sctp.h
new file mode 100644
index 000000000000..6ec66dec29f7
--- /dev/null
+++ b/include/linux/sctp.h
@@ -0,0 +1,594 @@
+/* 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.
+ *
+ * The SCTP reference 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.
+ *
+ * The SCTP reference 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, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ *    lksctp developers <lksctp-developerst@lists.sourceforge.net>
+ *
+ * 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.  */
+
+
+/* Section 3.1.  SCTP Common Header Format */
+typedef struct sctphdr {
+        __u16 source;
+        __u16 dest;
+        __u32 vtag;
+        __u32 checksum;
+} __attribute__((packed)) sctp_sctphdr_t;
+
+/* Section 3.2.  Chunk Field Descriptions. */
+typedef struct sctp_chunkhdr {
+        __u8 type;
+        __u8 flags;
+        __u16 length;
+} __attribute__((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,
+
+        /* 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 {
+        __u16 type;
+        __u16 length;
+} __attribute__((packed)) sctp_paramhdr_t;
+
+typedef enum {
+
+        /* RFC 2960 Section 3.3.5 */
+        SCTP_PARAM_HEARTBEAT_INFO               = __constant_htons(1),
+        /* RFC 2960 Section 3.3.2.1 */
+        SCTP_PARAM_IPV4_ADDRESS                 = __constant_htons(5),
+        SCTP_PARAM_IPV6_ADDRESS                 = __constant_htons(6),
+        SCTP_PARAM_STATE_COOKIE                 = __constant_htons(7),
+        SCTP_PARAM_UNRECOGNIZED_PARAMETERS      = __constant_htons(8),
+        SCTP_PARAM_COOKIE_PRESERVATIVE          = __constant_htons(9),
+        SCTP_PARAM_HOST_NAME_ADDRESS            = __constant_htons(11),
+        SCTP_PARAM_SUPPORTED_ADDRESS_TYPES      = __constant_htons(12),
+        SCTP_PARAM_ECN_CAPABLE                  = __constant_htons(0x8000),
+
+        /* PR-SCTP Sec 3.1 */
+        SCTP_PARAM_FWD_TSN_SUPPORT      = __constant_htons(0xc000),
+
+        /* Add-IP Extension. Section 3.2 */
+        SCTP_PARAM_ADD_IP               = __constant_htons(0xc001),
+        SCTP_PARAM_DEL_IP               = __constant_htons(0xc002),
+        SCTP_PARAM_ERR_CAUSE            = __constant_htons(0xc003),
+        SCTP_PARAM_SET_PRIMARY          = __constant_htons(0xc004),
+        SCTP_PARAM_SUCCESS_REPORT       = __constant_htons(0xc005),
+        SCTP_PARAM_ADAPTION_LAYER_IND   = __constant_htons(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     = __constant_htons(0x0000),
+        SCTP_PARAM_ACTION_DISCARD_ERR = __constant_htons(0x4000),
+        SCTP_PARAM_ACTION_SKIP        = __constant_htons(0x8000),
+        SCTP_PARAM_ACTION_SKIP_ERR    = __constant_htons(0xc000),
+} sctp_param_action_t;
+
+enum { SCTP_PARAM_ACTION_MASK = __constant_htons(0xc000), };
+
+/* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */
+
+typedef struct sctp_datahdr {
+        __u32 tsn;
+        __u16 stream;
+        __u16 ssn;
+        __u32 ppid;
+        __u8  payload[0];
+} __attribute__((packed)) sctp_datahdr_t;
+
+typedef struct sctp_data_chunk {
+        sctp_chunkhdr_t chunk_hdr;
+        sctp_datahdr_t  data_hdr;
+} __attribute__((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,
+};
+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 {
+        __u32 init_tag;
+        __u32 a_rwnd;
+        __u16 num_outbound_streams;
+        __u16 num_inbound_streams;
+        __u32 initial_tsn;
+        __u8  params[0];
+} __attribute__((packed)) sctp_inithdr_t;
+
+typedef struct sctp_init_chunk {
+        sctp_chunkhdr_t chunk_hdr;
+        sctp_inithdr_t init_hdr;
+} __attribute__((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;
+} __attribute__((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;
+} __attribute__((packed)) sctp_ipv6addr_param_t;
+
+/* Section 3.3.2.1 Cookie Preservative (9) */
+typedef struct sctp_cookie_preserve_param {
+        sctp_paramhdr_t param_hdr;
+        uint32_t        lifespan_increment;
+} __attribute__((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];
+} __attribute__((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;
+        uint16_t types[0];
+} __attribute__((packed)) sctp_supported_addrs_param_t;
+
+/* Appendix A. ECN Capable (32768) */
+typedef struct sctp_ecn_capable_param {
+        sctp_paramhdr_t param_hdr;
+} __attribute__((packed)) sctp_ecn_capable_param_t;
+
+/* ADDIP Section 3.2.6 Adaption Layer Indication */
+typedef struct sctp_adaption_ind_param {
+        struct sctp_paramhdr param_hdr;
+        __u32 adaption_ind;
+} __attribute__((packed)) sctp_adaption_ind_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];
+} __attribute__((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;
+} __attribute__((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 {
+        __u16 start;
+        __u16 end;
+} __attribute__((packed)) sctp_gap_ack_block_t;
+
+typedef uint32_t 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 {
+        __u32 cum_tsn_ack;
+        __u32 a_rwnd;
+        __u16 num_gap_ack_blocks;
+        __u16 num_dup_tsns;
+        sctp_sack_variable_t variable[0];
+} __attribute__((packed)) sctp_sackhdr_t;
+
+typedef struct sctp_sack_chunk {
+        sctp_chunkhdr_t chunk_hdr;
+        sctp_sackhdr_t sack_hdr;
+} __attribute__((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;
+} __attribute__((packed)) sctp_heartbeathdr_t;
+
+typedef struct sctp_heartbeat_chunk {
+        sctp_chunkhdr_t chunk_hdr;
+        sctp_heartbeathdr_t hb_hdr;
+} __attribute__((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;
+} __attribute__((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 {
+        __u32 cum_tsn_ack;
+} __attribute__((packed)) sctp_shutdownhdr_t;
+
+struct sctp_shutdown_chunk_t {
+        sctp_chunkhdr_t    chunk_hdr;
+        sctp_shutdownhdr_t shutdown_hdr;
+} __attribute__ ((packed));
+
+/* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
+
+typedef struct sctp_errhdr {
+        __u16 cause;
+        __u16 length;
+        __u8  variable[0];
+} __attribute__((packed)) sctp_errhdr_t;
+
+typedef struct sctp_operr_chunk {
+        sctp_chunkhdr_t chunk_hdr;
+        sctp_errhdr_t   err_hdr;
+} __attribute__((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        = __constant_htons(0x00),
+        SCTP_ERROR_INV_STRM        = __constant_htons(0x01),
+        SCTP_ERROR_MISS_PARAM      = __constant_htons(0x02),
+        SCTP_ERROR_STALE_COOKIE    = __constant_htons(0x03),
+        SCTP_ERROR_NO_RESOURCE     = __constant_htons(0x04),
+        SCTP_ERROR_DNS_FAILED      = __constant_htons(0x05),
+        SCTP_ERROR_UNKNOWN_CHUNK   = __constant_htons(0x06),
+        SCTP_ERROR_INV_PARAM       = __constant_htons(0x07),
+        SCTP_ERROR_UNKNOWN_PARAM   = __constant_htons(0x08),
+        SCTP_ERROR_NO_DATA         = __constant_htons(0x09),
+        SCTP_ERROR_COOKIE_IN_SHUTDOWN = __constant_htons(0x0a),
+
+
+        /* SCTP Implementation Guide:
+         *  11  Restart of an association with new addresses
+         *  12  User Initiated Abort
+         *  13  Protocol Violation
+         */
+
+        SCTP_ERROR_RESTART         = __constant_htons(0x0b),
+        SCTP_ERROR_USER_ABORT      = __constant_htons(0x0c),
+        SCTP_ERROR_PROTO_VIOLATION = __constant_htons(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
+         * ---------      ----------------
+         * 0x0100          Request to Delete Last Remaining IP Address.
+         * 0x0101          Operation Refused Due to Resource Shortage.
+         * 0x0102          Request to Delete Source IP Address.
+         * 0x0103          Association Aborted due to illegal ASCONF-ACK
+         * 0x0104          Request refused - no authorization.
+         */
+        SCTP_ERROR_DEL_LAST_IP  = __constant_htons(0x0100),
+        SCTP_ERROR_RSRC_LOW     = __constant_htons(0x0101),
+        SCTP_ERROR_DEL_SRC_IP   = __constant_htons(0x0102),
+        SCTP_ERROR_ASCONF_ACK   = __constant_htons(0x0103),
+        SCTP_ERROR_REQ_REFUSED  = __constant_htons(0x0104)
+} sctp_error_t;
+
+
+
+/* RFC 2960.  Appendix A.  Explicit Congestion Notification.
+ *   Explicit Congestion Notification Echo (ECNE) (12)
+ */
+typedef struct sctp_ecnehdr {
+        __u32 lowest_tsn;
+} sctp_ecnehdr_t;
+
+typedef struct sctp_ecne_chunk {
+        sctp_chunkhdr_t chunk_hdr;
+        sctp_ecnehdr_t ence_hdr;
+} __attribute__((packed)) sctp_ecne_chunk_t;
+
+/* RFC 2960.  Appendix A.  Explicit Congestion Notification.
+ *   Congestion Window Reduced (CWR) (13)
+ */
+typedef struct sctp_cwrhdr {
+        __u32 lowest_tsn;
+} sctp_cwrhdr_t;
+
+typedef struct sctp_cwr_chunk {
+        sctp_chunkhdr_t chunk_hdr;
+        sctp_cwrhdr_t cwr_hdr;
+} __attribute__((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 {
+        __u16 stream;
+        __u16 ssn;
+} __attribute__((packed));
+
+struct sctp_fwdtsn_hdr {
+        __u32 new_cum_tsn;
+        struct sctp_fwdtsn_skip skip[0];
+} __attribute((packed));
+
+struct sctp_fwdtsn_chunk {
+        struct sctp_chunkhdr chunk_hdr;
+        struct sctp_fwdtsn_hdr fwdtsn_hdr;
+} __attribute((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;
+        __u32           crr_id; 
+} __attribute__((packed)) sctp_addip_param_t;
+
+typedef struct sctp_addiphdr {
+        __u32   serial;
+        __u8    params[0];
+} __attribute__((packed)) sctp_addiphdr_t;
+
+typedef struct sctp_addip_chunk {
+        sctp_chunkhdr_t chunk_hdr;
+        sctp_addiphdr_t addip_hdr;
+} __attribute__((packed)) sctp_addip_chunk_t;
+
+#endif /* __LINUX_SCTP_H__ */