diff options
Diffstat (limited to 'include/linux/sctp.h')
| -rw-r--r-- | include/linux/sctp.h | 594 |
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__ */ |