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a6227e26d9
Several files refer to an old address for the Free Software Foundation in the file header comment. Resolve by replacing the address with the URL <http://www.gnu.org/licenses/> so that we do not have to keep updating the header comments anytime the address changes. Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
428 lines
14 KiB
C
428 lines
14 KiB
C
/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2001, 2004
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001 Intel Corp.
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*
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* This file is part of the SCTP kernel implementation
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*
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* Please send any bug reports or fixes you make to the
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* email address(es):
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* lksctp developers <linux-sctp@vger.kernel.org>
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*
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* Written or modified by:
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Randall Stewart <randall@stewart.chicago.il.us>
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* Ken Morneau <kmorneau@cisco.com>
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* Qiaobing Xie <qxie1@motorola.com>
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* Xingang Guo <xingang.guo@intel.com>
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* Sridhar Samudrala <samudrala@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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*/
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#ifndef __sctp_constants_h__
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#define __sctp_constants_h__
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#include <linux/sctp.h>
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#include <linux/ipv6.h> /* For ipv6hdr. */
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#include <net/tcp_states.h> /* For TCP states used in sctp_sock_state_t */
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/* Value used for stream negotiation. */
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enum { SCTP_MAX_STREAM = 0xffff };
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enum { SCTP_DEFAULT_OUTSTREAMS = 10 };
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enum { SCTP_DEFAULT_INSTREAMS = SCTP_MAX_STREAM };
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/* Since CIDs are sparse, we need all four of the following
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* symbols. CIDs are dense through SCTP_CID_BASE_MAX.
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*/
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#define SCTP_CID_BASE_MAX SCTP_CID_SHUTDOWN_COMPLETE
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#define SCTP_NUM_BASE_CHUNK_TYPES (SCTP_CID_BASE_MAX + 1)
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#define SCTP_NUM_ADDIP_CHUNK_TYPES 2
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#define SCTP_NUM_PRSCTP_CHUNK_TYPES 1
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#define SCTP_NUM_AUTH_CHUNK_TYPES 1
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#define SCTP_NUM_CHUNK_TYPES (SCTP_NUM_BASE_CHUNK_TYPES + \
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SCTP_NUM_ADDIP_CHUNK_TYPES +\
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SCTP_NUM_PRSCTP_CHUNK_TYPES +\
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SCTP_NUM_AUTH_CHUNK_TYPES)
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/* These are the different flavours of event. */
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typedef enum {
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SCTP_EVENT_T_CHUNK = 1,
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SCTP_EVENT_T_TIMEOUT,
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SCTP_EVENT_T_OTHER,
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SCTP_EVENT_T_PRIMITIVE
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} sctp_event_t;
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/* As a convenience for the state machine, we append SCTP_EVENT_* and
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* SCTP_ULP_* to the list of possible chunks.
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*/
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typedef enum {
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SCTP_EVENT_TIMEOUT_NONE = 0,
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SCTP_EVENT_TIMEOUT_T1_COOKIE,
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SCTP_EVENT_TIMEOUT_T1_INIT,
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SCTP_EVENT_TIMEOUT_T2_SHUTDOWN,
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SCTP_EVENT_TIMEOUT_T3_RTX,
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SCTP_EVENT_TIMEOUT_T4_RTO,
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SCTP_EVENT_TIMEOUT_T5_SHUTDOWN_GUARD,
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SCTP_EVENT_TIMEOUT_HEARTBEAT,
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SCTP_EVENT_TIMEOUT_SACK,
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SCTP_EVENT_TIMEOUT_AUTOCLOSE,
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} sctp_event_timeout_t;
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#define SCTP_EVENT_TIMEOUT_MAX SCTP_EVENT_TIMEOUT_AUTOCLOSE
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#define SCTP_NUM_TIMEOUT_TYPES (SCTP_EVENT_TIMEOUT_MAX + 1)
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typedef enum {
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SCTP_EVENT_NO_PENDING_TSN = 0,
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SCTP_EVENT_ICMP_PROTO_UNREACH,
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} sctp_event_other_t;
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#define SCTP_EVENT_OTHER_MAX SCTP_EVENT_ICMP_PROTO_UNREACH
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#define SCTP_NUM_OTHER_TYPES (SCTP_EVENT_OTHER_MAX + 1)
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/* These are primitive requests from the ULP. */
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typedef enum {
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SCTP_PRIMITIVE_ASSOCIATE = 0,
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SCTP_PRIMITIVE_SHUTDOWN,
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SCTP_PRIMITIVE_ABORT,
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SCTP_PRIMITIVE_SEND,
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SCTP_PRIMITIVE_REQUESTHEARTBEAT,
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SCTP_PRIMITIVE_ASCONF,
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} sctp_event_primitive_t;
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#define SCTP_EVENT_PRIMITIVE_MAX SCTP_PRIMITIVE_ASCONF
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#define SCTP_NUM_PRIMITIVE_TYPES (SCTP_EVENT_PRIMITIVE_MAX + 1)
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/* We define here a utility type for manipulating subtypes.
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* The subtype constructors all work like this:
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*
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* sctp_subtype_t foo = SCTP_ST_CHUNK(SCTP_CID_INIT);
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*/
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typedef union {
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sctp_cid_t chunk;
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sctp_event_timeout_t timeout;
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sctp_event_other_t other;
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sctp_event_primitive_t primitive;
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} sctp_subtype_t;
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#define SCTP_SUBTYPE_CONSTRUCTOR(_name, _type, _elt) \
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static inline sctp_subtype_t \
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SCTP_ST_## _name (_type _arg) \
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{ sctp_subtype_t _retval; _retval._elt = _arg; return _retval; }
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SCTP_SUBTYPE_CONSTRUCTOR(CHUNK, sctp_cid_t, chunk)
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SCTP_SUBTYPE_CONSTRUCTOR(TIMEOUT, sctp_event_timeout_t, timeout)
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SCTP_SUBTYPE_CONSTRUCTOR(OTHER, sctp_event_other_t, other)
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SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, sctp_event_primitive_t, primitive)
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#define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA)
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/* Calculate the actual data size in a data chunk */
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#define SCTP_DATA_SNDSIZE(c) ((int)((unsigned long)(c->chunk_end)\
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- (unsigned long)(c->chunk_hdr)\
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- sizeof(sctp_data_chunk_t)))
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/* Internal error codes */
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typedef enum {
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SCTP_IERROR_NO_ERROR = 0,
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SCTP_IERROR_BASE = 1000,
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SCTP_IERROR_NO_COOKIE,
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SCTP_IERROR_BAD_SIG,
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SCTP_IERROR_STALE_COOKIE,
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SCTP_IERROR_NOMEM,
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SCTP_IERROR_MALFORMED,
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SCTP_IERROR_BAD_TAG,
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SCTP_IERROR_BIG_GAP,
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SCTP_IERROR_DUP_TSN,
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SCTP_IERROR_HIGH_TSN,
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SCTP_IERROR_IGNORE_TSN,
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SCTP_IERROR_NO_DATA,
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SCTP_IERROR_BAD_STREAM,
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SCTP_IERROR_BAD_PORTS,
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SCTP_IERROR_AUTH_BAD_HMAC,
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SCTP_IERROR_AUTH_BAD_KEYID,
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SCTP_IERROR_PROTO_VIOLATION,
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SCTP_IERROR_ERROR,
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SCTP_IERROR_ABORT,
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} sctp_ierror_t;
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/* SCTP state defines for internal state machine */
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typedef enum {
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SCTP_STATE_CLOSED = 0,
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SCTP_STATE_COOKIE_WAIT = 1,
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SCTP_STATE_COOKIE_ECHOED = 2,
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SCTP_STATE_ESTABLISHED = 3,
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SCTP_STATE_SHUTDOWN_PENDING = 4,
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SCTP_STATE_SHUTDOWN_SENT = 5,
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SCTP_STATE_SHUTDOWN_RECEIVED = 6,
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SCTP_STATE_SHUTDOWN_ACK_SENT = 7,
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} sctp_state_t;
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#define SCTP_STATE_MAX SCTP_STATE_SHUTDOWN_ACK_SENT
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#define SCTP_STATE_NUM_STATES (SCTP_STATE_MAX + 1)
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/* These are values for sk->state.
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* For a UDP-style SCTP socket, the states are defined as follows
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* - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
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* accept new associations, but it can initiate the creation of new ones.
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* - A socket in SCTP_SS_LISTENING state indicates that it is willing to
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* accept new associations and can initiate the creation of new ones.
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* - A socket in SCTP_SS_ESTABLISHED state indicates that it is a peeled off
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* socket with one association.
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* For a TCP-style SCTP socket, the states are defined as follows
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* - A socket in SCTP_SS_CLOSED state indicates that it is not willing to
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* accept new associations, but it can initiate the creation of new ones.
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* - A socket in SCTP_SS_LISTENING state indicates that it is willing to
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* accept new associations, but cannot initiate the creation of new ones.
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* - A socket in SCTP_SS_ESTABLISHED state indicates that it has a single
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* association.
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*/
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typedef enum {
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SCTP_SS_CLOSED = TCP_CLOSE,
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SCTP_SS_LISTENING = TCP_LISTEN,
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SCTP_SS_ESTABLISHING = TCP_SYN_SENT,
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SCTP_SS_ESTABLISHED = TCP_ESTABLISHED,
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SCTP_SS_CLOSING = TCP_CLOSING,
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} sctp_sock_state_t;
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/* These functions map various type to printable names. */
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const char *sctp_cname(const sctp_subtype_t); /* chunk types */
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const char *sctp_oname(const sctp_subtype_t); /* other events */
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const char *sctp_tname(const sctp_subtype_t); /* timeouts */
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const char *sctp_pname(const sctp_subtype_t); /* primitives */
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/* This is a table of printable names of sctp_state_t's. */
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extern const char *const sctp_state_tbl[];
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extern const char *const sctp_evttype_tbl[];
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extern const char *const sctp_status_tbl[];
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/* Maximum chunk length considering padding requirements. */
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enum { SCTP_MAX_CHUNK_LEN = ((1<<16) - sizeof(__u32)) };
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/* Encourage Cookie-Echo bundling by pre-fragmenting chunks a little
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* harder (until reaching ESTABLISHED state).
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*/
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enum { SCTP_ARBITRARY_COOKIE_ECHO_LEN = 200 };
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/* Guess at how big to make the TSN mapping array.
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* We guarantee that we can handle at least this big a gap between the
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* cumulative ACK and the highest TSN. In practice, we can often
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* handle up to twice this value.
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*
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* NEVER make this more than 32767 (2^15-1). The Gap Ack Blocks in a
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* SACK (see section 3.3.4) are only 16 bits, so 2*SCTP_TSN_MAP_SIZE
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* must be less than 65535 (2^16 - 1), or we will have overflow
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* problems creating SACK's.
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*/
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#define SCTP_TSN_MAP_INITIAL BITS_PER_LONG
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#define SCTP_TSN_MAP_INCREMENT SCTP_TSN_MAP_INITIAL
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#define SCTP_TSN_MAP_SIZE 4096
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/* We will not record more than this many duplicate TSNs between two
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* SACKs. The minimum PMTU is 576. Remove all the headers and there
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* is enough room for 131 duplicate reports. Round down to the
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* nearest power of 2.
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*/
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enum { SCTP_MIN_PMTU = 576 };
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enum { SCTP_MAX_DUP_TSNS = 16 };
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enum { SCTP_MAX_GABS = 16 };
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/* Heartbeat interval - 30 secs */
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#define SCTP_DEFAULT_TIMEOUT_HEARTBEAT (30*1000)
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/* Delayed sack timer - 200ms */
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#define SCTP_DEFAULT_TIMEOUT_SACK (200)
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/* RTO.Initial - 3 seconds
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* RTO.Min - 1 second
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* RTO.Max - 60 seconds
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* RTO.Alpha - 1/8
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* RTO.Beta - 1/4
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*/
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#define SCTP_RTO_INITIAL (3 * 1000)
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#define SCTP_RTO_MIN (1 * 1000)
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#define SCTP_RTO_MAX (60 * 1000)
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#define SCTP_RTO_ALPHA 3 /* 1/8 when converted to right shifts. */
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#define SCTP_RTO_BETA 2 /* 1/4 when converted to right shifts. */
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/* Maximum number of new data packets that can be sent in a burst. */
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#define SCTP_DEFAULT_MAX_BURST 4
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#define SCTP_CLOCK_GRANULARITY 1 /* 1 jiffy */
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#define SCTP_DEFAULT_COOKIE_LIFE (60 * 1000) /* 60 seconds */
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#define SCTP_DEFAULT_MINWINDOW 1500 /* default minimum rwnd size */
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#define SCTP_DEFAULT_MAXWINDOW 65535 /* default rwnd size */
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#define SCTP_DEFAULT_RWND_SHIFT 4 /* by default, update on 1/16 of
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* rcvbuf, which is 1/8 of initial
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* window
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*/
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#define SCTP_DEFAULT_MAXSEGMENT 1500 /* MTU size, this is the limit
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* to which we will raise the P-MTU.
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*/
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#define SCTP_DEFAULT_MINSEGMENT 512 /* MTU size ... if no mtu disc */
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#define SCTP_SECRET_SIZE 32 /* Number of octets in a 256 bits. */
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#define SCTP_SIGNATURE_SIZE 20 /* size of a SLA-1 signature */
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#define SCTP_COOKIE_MULTIPLE 32 /* Pad out our cookie to make our hash
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* functions simpler to write.
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*/
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/* These return values describe the success or failure of a number of
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* routines which form the lower interface to SCTP_outqueue.
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*/
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typedef enum {
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SCTP_XMIT_OK,
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SCTP_XMIT_PMTU_FULL,
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SCTP_XMIT_RWND_FULL,
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SCTP_XMIT_NAGLE_DELAY,
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} sctp_xmit_t;
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/* These are the commands for manipulating transports. */
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typedef enum {
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SCTP_TRANSPORT_UP,
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SCTP_TRANSPORT_DOWN,
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SCTP_TRANSPORT_PF,
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} sctp_transport_cmd_t;
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/* These are the address scopes defined mainly for IPv4 addresses
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* based on draft of SCTP IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>.
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* These scopes are hopefully generic enough to be used on scoping both
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* IPv4 and IPv6 addresses in SCTP.
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* At this point, the IPv6 scopes will be mapped to these internal scopes
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* as much as possible.
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*/
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typedef enum {
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SCTP_SCOPE_GLOBAL, /* IPv4 global addresses */
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SCTP_SCOPE_PRIVATE, /* IPv4 private addresses */
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SCTP_SCOPE_LINK, /* IPv4 link local address */
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SCTP_SCOPE_LOOPBACK, /* IPv4 loopback address */
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SCTP_SCOPE_UNUSABLE, /* IPv4 unusable addresses */
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} sctp_scope_t;
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typedef enum {
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SCTP_SCOPE_POLICY_DISABLE, /* Disable IPv4 address scoping */
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SCTP_SCOPE_POLICY_ENABLE, /* Enable IPv4 address scoping */
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SCTP_SCOPE_POLICY_PRIVATE, /* Follow draft but allow IPv4 private addresses */
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SCTP_SCOPE_POLICY_LINK, /* Follow draft but allow IPv4 link local addresses */
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} sctp_scope_policy_t;
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/* Based on IPv4 scoping <draft-stewart-tsvwg-sctp-ipv4-00.txt>,
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* SCTP IPv4 unusable addresses: 0.0.0.0/8, 224.0.0.0/4, 198.18.0.0/24,
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* 192.88.99.0/24.
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* Also, RFC 8.4, non-unicast addresses are not considered valid SCTP
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* addresses.
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*/
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#define IS_IPV4_UNUSABLE_ADDRESS(a) \
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((htonl(INADDR_BROADCAST) == a) || \
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ipv4_is_multicast(a) || \
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ipv4_is_zeronet(a) || \
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ipv4_is_test_198(a) || \
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ipv4_is_anycast_6to4(a))
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/* Flags used for the bind address copy functions. */
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#define SCTP_ADDR6_ALLOWED 0x00000001 /* IPv6 address is allowed by
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local sock family */
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#define SCTP_ADDR4_PEERSUPP 0x00000002 /* IPv4 address is supported by
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peer */
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#define SCTP_ADDR6_PEERSUPP 0x00000004 /* IPv6 address is supported by
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peer */
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/* Reasons to retransmit. */
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typedef enum {
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SCTP_RTXR_T3_RTX,
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SCTP_RTXR_FAST_RTX,
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SCTP_RTXR_PMTUD,
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SCTP_RTXR_T1_RTX,
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} sctp_retransmit_reason_t;
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/* Reasons to lower cwnd. */
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typedef enum {
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SCTP_LOWER_CWND_T3_RTX,
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SCTP_LOWER_CWND_FAST_RTX,
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SCTP_LOWER_CWND_ECNE,
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SCTP_LOWER_CWND_INACTIVE,
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} sctp_lower_cwnd_t;
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/* SCTP-AUTH Necessary constants */
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/* SCTP-AUTH, Section 3.3
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*
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* The following Table 2 shows the currently defined values for HMAC
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* identifiers.
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*
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* +-----------------+--------------------------+
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* | HMAC Identifier | Message Digest Algorithm |
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* +-----------------+--------------------------+
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* | 0 | Reserved |
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* | 1 | SHA-1 defined in [8] |
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* | 2 | Reserved |
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* | 3 | SHA-256 defined in [8] |
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* +-----------------+--------------------------+
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*/
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enum {
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SCTP_AUTH_HMAC_ID_RESERVED_0,
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SCTP_AUTH_HMAC_ID_SHA1,
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SCTP_AUTH_HMAC_ID_RESERVED_2,
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#if defined (CONFIG_CRYPTO_SHA256) || defined (CONFIG_CRYPTO_SHA256_MODULE)
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SCTP_AUTH_HMAC_ID_SHA256,
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#endif
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__SCTP_AUTH_HMAC_MAX
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};
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#define SCTP_AUTH_HMAC_ID_MAX __SCTP_AUTH_HMAC_MAX - 1
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#define SCTP_AUTH_NUM_HMACS __SCTP_AUTH_HMAC_MAX
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#define SCTP_SHA1_SIG_SIZE 20
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#define SCTP_SHA256_SIG_SIZE 32
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/* SCTP-AUTH, Section 3.2
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* The chunk types for INIT, INIT-ACK, SHUTDOWN-COMPLETE and AUTH chunks
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* MUST NOT be listed in the CHUNKS parameter
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*/
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#define SCTP_NUM_NOAUTH_CHUNKS 4
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#define SCTP_AUTH_MAX_CHUNKS (SCTP_NUM_CHUNK_TYPES - SCTP_NUM_NOAUTH_CHUNKS)
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/* SCTP-AUTH Section 6.1
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* The RANDOM parameter MUST contain a 32 byte random number.
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*/
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#define SCTP_AUTH_RANDOM_LENGTH 32
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#endif /* __sctp_constants_h__ */
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