/* SPDX-License-Identifier: GPL-2.0-or-later */ /* 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. * * 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 */ struct sctphdr { __be16 source; __be16 dest; __be32 vtag; __le32 checksum; }; static inline struct sctphdr *sctp_hdr(const struct sk_buff *skb) { return (struct sctphdr *)skb_transport_header(skb); } /* Section 3.2. Chunk Field Descriptions. */ struct sctp_chunkhdr { __u8 type; __u8 flags; __be16 length; }; /* 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. */ enum sctp_cid { 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, /* sctp ndata 5.1. I-DATA */ SCTP_CID_I_DATA = 0x40, /* 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_I_FWD_TSN = 0xC2, SCTP_CID_ASCONF_ACK = 0x80, SCTP_CID_RECONF = 0x82, SCTP_CID_PAD = 0x84, }; /* 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. */ enum { SCTP_CID_ACTION_DISCARD = 0x00, SCTP_CID_ACTION_DISCARD_ERR = 0x40, SCTP_CID_ACTION_SKIP = 0x80, SCTP_CID_ACTION_SKIP_ERR = 0xc0, }; 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. */ struct sctp_paramhdr { __be16 type; __be16 length; }; enum sctp_param { /* 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), /* RE-CONFIG. Section 4 */ SCTP_PARAM_RESET_OUT_REQUEST = cpu_to_be16(0x000d), SCTP_PARAM_RESET_IN_REQUEST = cpu_to_be16(0x000e), SCTP_PARAM_RESET_TSN_REQUEST = cpu_to_be16(0x000f), SCTP_PARAM_RESET_RESPONSE = cpu_to_be16(0x0010), SCTP_PARAM_RESET_ADD_OUT_STREAMS = cpu_to_be16(0x0011), SCTP_PARAM_RESET_ADD_IN_STREAMS = cpu_to_be16(0x0012), }; /* 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. * */ 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), }; enum { SCTP_PARAM_ACTION_MASK = cpu_to_be16(0xc000), }; /* RFC 2960 Section 3.3.1 Payload Data (DATA) (0) */ struct sctp_datahdr { __be32 tsn; __be16 stream; __be16 ssn; __u32 ppid; /* __u8 payload[]; */ }; struct sctp_data_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_datahdr data_hdr; }; struct sctp_idatahdr { __be32 tsn; __be16 stream; __be16 reserved; __be32 mid; union { __u32 ppid; __be32 fsn; }; __u8 payload[0]; }; struct sctp_idata_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_idatahdr data_hdr; }; /* 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. */ struct sctp_inithdr { __be32 init_tag; __be32 a_rwnd; __be16 num_outbound_streams; __be16 num_inbound_streams; __be32 initial_tsn; /* __u8 params[]; */ }; struct sctp_init_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_inithdr init_hdr; }; /* Section 3.3.2.1. IPv4 Address Parameter (5) */ struct sctp_ipv4addr_param { struct sctp_paramhdr param_hdr; struct in_addr addr; }; /* Section 3.3.2.1. IPv6 Address Parameter (6) */ struct sctp_ipv6addr_param { struct sctp_paramhdr param_hdr; struct in6_addr addr; }; /* Section 3.3.2.1 Cookie Preservative (9) */ struct sctp_cookie_preserve_param { struct sctp_paramhdr param_hdr; __be32 lifespan_increment; }; /* Section 3.3.2.1 Host Name Address (11) */ struct sctp_hostname_param { struct sctp_paramhdr param_hdr; uint8_t hostname[]; }; /* Section 3.3.2.1 Supported Address Types (12) */ struct sctp_supported_addrs_param { struct sctp_paramhdr param_hdr; __be16 types[]; }; /* ADDIP Section 3.2.6 Adaptation Layer Indication */ struct sctp_adaptation_ind_param { struct sctp_paramhdr param_hdr; __be32 adaptation_ind; }; /* ADDIP Section 4.2.7 Supported Extensions Parameter */ struct sctp_supported_ext_param { struct sctp_paramhdr param_hdr; __u8 chunks[]; }; /* AUTH Section 3.1 Random */ struct sctp_random_param { struct sctp_paramhdr param_hdr; __u8 random_val[]; }; /* AUTH Section 3.2 Chunk List */ struct sctp_chunks_param { struct sctp_paramhdr param_hdr; __u8 chunks[]; }; /* AUTH Section 3.3 HMAC Algorithm */ struct sctp_hmac_algo_param { struct sctp_paramhdr param_hdr; __be16 hmac_ids[]; }; /* 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. */ struct sctp_initack_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_inithdr init_hdr; }; /* Section 3.3.3.1 State Cookie (7) */ struct sctp_cookie_param { struct sctp_paramhdr p; __u8 body[]; }; /* Section 3.3.3.1 Unrecognized Parameters (8) */ struct sctp_unrecognized_param { struct sctp_paramhdr param_hdr; struct sctp_paramhdr unrecognized; }; /* * 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. */ struct sctp_gap_ack_block { __be16 start; __be16 end; }; union sctp_sack_variable { struct sctp_gap_ack_block gab; __be32 dup; }; struct sctp_sackhdr { __be32 cum_tsn_ack; __be32 a_rwnd; __be16 num_gap_ack_blocks; __be16 num_dup_tsns; /* union sctp_sack_variable variable[]; */ }; struct sctp_sack_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_sackhdr sack_hdr; }; /* 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. */ struct sctp_heartbeathdr { struct sctp_paramhdr info; }; struct sctp_heartbeat_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_heartbeathdr hb_hdr; }; /* PAD chunk could be bundled with heartbeat chunk to probe pmtu */ struct sctp_pad_chunk { struct sctp_chunkhdr uh; }; /* 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. */ struct sctp_abort_chunk { struct sctp_chunkhdr uh; }; /* For the graceful shutdown we must carry the tag (in common header) * and the highest consecutive acking value. */ struct sctp_shutdownhdr { __be32 cum_tsn_ack; }; struct sctp_shutdown_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_shutdownhdr shutdown_hdr; }; /* RFC 2960. Section 3.3.10 Operation Error (ERROR) (9) */ struct sctp_errhdr { __be16 cause; __be16 length; /* __u8 variable[]; */ }; struct sctp_operr_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_errhdr err_hdr; }; /* 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 */ enum sctp_error { 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 * 14 Restart of an Association with New Encapsulation Port */ SCTP_ERROR_RESTART = cpu_to_be16(0x0b), SCTP_ERROR_USER_ABORT = cpu_to_be16(0x0c), SCTP_ERROR_PROTO_VIOLATION = cpu_to_be16(0x0d), SCTP_ERROR_NEW_ENCAP_PORT = cpu_to_be16(0x0e), /* 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) }; /* RFC 2960. Appendix A. Explicit Congestion Notification. * Explicit Congestion Notification Echo (ECNE) (12) */ struct sctp_ecnehdr { __be32 lowest_tsn; }; struct sctp_ecne_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_ecnehdr ence_hdr; }; /* RFC 2960. Appendix A. Explicit Congestion Notification. * Congestion Window Reduced (CWR) (13) */ struct sctp_cwrhdr { __be32 lowest_tsn; }; /* 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; }; struct sctp_fwdtsn_hdr { __be32 new_cum_tsn; /* struct sctp_fwdtsn_skip skip[]; */ }; struct sctp_fwdtsn_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_fwdtsn_hdr fwdtsn_hdr; }; struct sctp_ifwdtsn_skip { __be16 stream; __u8 reserved; __u8 flags; __be32 mid; }; struct sctp_ifwdtsn_hdr { __be32 new_cum_tsn; /* struct sctp_ifwdtsn_skip skip[]; */ }; struct sctp_ifwdtsn_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_ifwdtsn_hdr fwdtsn_hdr; }; /* 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. */ struct sctp_addip_param { struct sctp_paramhdr param_hdr; __be32 crr_id; }; struct sctp_addiphdr { __be32 serial; /* __u8 params[]; */ }; struct sctp_addip_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_addiphdr addip_hdr; }; /* 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. */ struct sctp_authhdr { __be16 shkey_id; __be16 hmac_id; /* __u8 hmac[]; */ }; struct sctp_auth_chunk { struct sctp_chunkhdr chunk_hdr; struct sctp_authhdr auth_hdr; }; struct sctp_infox { struct sctp_info *sctpinfo; struct sctp_association *asoc; }; struct sctp_reconf_chunk { struct sctp_chunkhdr chunk_hdr; /* __u8 params[]; */ }; struct sctp_strreset_outreq { struct sctp_paramhdr param_hdr; __be32 request_seq; __be32 response_seq; __be32 send_reset_at_tsn; __be16 list_of_streams[]; }; struct sctp_strreset_inreq { struct sctp_paramhdr param_hdr; __be32 request_seq; __be16 list_of_streams[]; }; struct sctp_strreset_tsnreq { struct sctp_paramhdr param_hdr; __be32 request_seq; }; struct sctp_strreset_addstrm { struct sctp_paramhdr param_hdr; __be32 request_seq; __be16 number_of_streams; __be16 reserved; }; enum { SCTP_STRRESET_NOTHING_TO_DO = 0x00, SCTP_STRRESET_PERFORMED = 0x01, SCTP_STRRESET_DENIED = 0x02, SCTP_STRRESET_ERR_WRONG_SSN = 0x03, SCTP_STRRESET_ERR_IN_PROGRESS = 0x04, SCTP_STRRESET_ERR_BAD_SEQNO = 0x05, SCTP_STRRESET_IN_PROGRESS = 0x06, }; struct sctp_strreset_resp { struct sctp_paramhdr param_hdr; __be32 response_seq; __be32 result; }; struct sctp_strreset_resptsn { struct sctp_paramhdr param_hdr; __be32 response_seq; __be32 result; __be32 senders_next_tsn; __be32 receivers_next_tsn; }; enum { SCTP_DSCP_SET_MASK = 0x1, SCTP_DSCP_VAL_MASK = 0xfc, SCTP_FLOWLABEL_SET_MASK = 0x100000, SCTP_FLOWLABEL_VAL_MASK = 0xfffff }; /* UDP Encapsulation * draft-tuexen-tsvwg-sctp-udp-encaps-cons-03.html#section-4-4 * * The error cause indicating an "Restart of an Association with * New Encapsulation Port" * * 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 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Cause Code = 14 | Cause Length = 8 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ * | Current Encapsulation Port | New Encapsulation Port | * +-------------------------------+-------------------------------+ */ struct sctp_new_encap_port_hdr { __be16 cur_port; __be16 new_port; }; /* Round an int up to the next multiple of 4. */ #define SCTP_PAD4(s) (((s)+3)&~3) /* Truncate to the previous multiple of 4. */ #define SCTP_TRUNC4(s) ((s)&~3) #endif /* __LINUX_SCTP_H__ */