202 lines
6.7 KiB
C
202 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* SCTP kernel implementation
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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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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* These functions implement the SCTP primitive functions from Section 10.
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*
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* Note that the descriptions from the specification are USER level
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* functions--this file is the functions which populate the struct proto
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* for SCTP which is the BOTTOM of the sockets interface.
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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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* Narasimha Budihal <narasimha@refcode.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Ardelle Fan <ardelle.fan@intel.com>
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* Kevin Gao <kevin.gao@intel.com>
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*/
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#include <linux/types.h>
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#include <linux/list.h> /* For struct list_head */
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#include <linux/socket.h>
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#include <linux/ip.h>
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#include <linux/time.h> /* For struct timeval */
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#include <linux/gfp.h>
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#include <net/sock.h>
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#include <net/sctp/sctp.h>
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#include <net/sctp/sm.h>
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#define DECLARE_PRIMITIVE(name) \
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/* This is called in the code as sctp_primitive_ ## name. */ \
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int sctp_primitive_ ## name(struct net *net, struct sctp_association *asoc, \
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void *arg) { \
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int error = 0; \
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enum sctp_event_type event_type; union sctp_subtype subtype; \
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enum sctp_state state; \
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struct sctp_endpoint *ep; \
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\
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event_type = SCTP_EVENT_T_PRIMITIVE; \
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subtype = SCTP_ST_PRIMITIVE(SCTP_PRIMITIVE_ ## name); \
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state = asoc ? asoc->state : SCTP_STATE_CLOSED; \
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ep = asoc ? asoc->ep : NULL; \
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\
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error = sctp_do_sm(net, event_type, subtype, state, ep, asoc, \
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arg, GFP_KERNEL); \
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return error; \
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}
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/* 10.1 ULP-to-SCTP
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* B) Associate
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*
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* Format: ASSOCIATE(local SCTP instance name, destination transport addr,
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* outbound stream count)
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* -> association id [,destination transport addr list] [,outbound stream
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* count]
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*
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* This primitive allows the upper layer to initiate an association to a
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* specific peer endpoint.
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*
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* This version assumes that asoc is fully populated with the initial
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* parameters. We then return a traditional kernel indicator of
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* success or failure.
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*/
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/* This is called in the code as sctp_primitive_ASSOCIATE. */
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DECLARE_PRIMITIVE(ASSOCIATE)
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/* 10.1 ULP-to-SCTP
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* C) Shutdown
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*
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* Format: SHUTDOWN(association id)
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* -> result
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*
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* Gracefully closes an association. Any locally queued user data
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* will be delivered to the peer. The association will be terminated only
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* after the peer acknowledges all the SCTP packets sent. A success code
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* will be returned on successful termination of the association. If
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* attempting to terminate the association results in a failure, an error
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* code shall be returned.
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*/
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DECLARE_PRIMITIVE(SHUTDOWN);
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/* 10.1 ULP-to-SCTP
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* C) Abort
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*
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* Format: Abort(association id [, cause code])
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* -> result
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*
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* Ungracefully closes an association. Any locally queued user data
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* will be discarded and an ABORT chunk is sent to the peer. A success
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* code will be returned on successful abortion of the association. If
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* attempting to abort the association results in a failure, an error
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* code shall be returned.
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*/
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DECLARE_PRIMITIVE(ABORT);
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/* 10.1 ULP-to-SCTP
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* E) Send
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*
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* Format: SEND(association id, buffer address, byte count [,context]
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* [,stream id] [,life time] [,destination transport address]
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* [,unorder flag] [,no-bundle flag] [,payload protocol-id] )
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* -> result
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*
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* This is the main method to send user data via SCTP.
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*
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* Mandatory attributes:
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*
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* o association id - local handle to the SCTP association
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*
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* o buffer address - the location where the user message to be
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* transmitted is stored;
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*
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* o byte count - The size of the user data in number of bytes;
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*
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* Optional attributes:
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*
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* o context - an optional 32 bit integer that will be carried in the
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* sending failure notification to the ULP if the transportation of
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* this User Message fails.
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*
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* o stream id - to indicate which stream to send the data on. If not
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* specified, stream 0 will be used.
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*
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* o life time - specifies the life time of the user data. The user data
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* will not be sent by SCTP after the life time expires. This
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* parameter can be used to avoid efforts to transmit stale
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* user messages. SCTP notifies the ULP if the data cannot be
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* initiated to transport (i.e. sent to the destination via SCTP's
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* send primitive) within the life time variable. However, the
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* user data will be transmitted if SCTP has attempted to transmit a
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* chunk before the life time expired.
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*
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* o destination transport address - specified as one of the destination
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* transport addresses of the peer endpoint to which this packet
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* should be sent. Whenever possible, SCTP should use this destination
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* transport address for sending the packets, instead of the current
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* primary path.
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*
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* o unorder flag - this flag, if present, indicates that the user
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* would like the data delivered in an unordered fashion to the peer
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* (i.e., the U flag is set to 1 on all DATA chunks carrying this
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* message).
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*
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* o no-bundle flag - instructs SCTP not to bundle this user data with
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* other outbound DATA chunks. SCTP MAY still bundle even when
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* this flag is present, when faced with network congestion.
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*
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* o payload protocol-id - A 32 bit unsigned integer that is to be
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* passed to the peer indicating the type of payload protocol data
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* being transmitted. This value is passed as opaque data by SCTP.
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*/
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DECLARE_PRIMITIVE(SEND);
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/* 10.1 ULP-to-SCTP
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* J) Request Heartbeat
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*
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* Format: REQUESTHEARTBEAT(association id, destination transport address)
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*
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* -> result
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*
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* Instructs the local endpoint to perform a HeartBeat on the specified
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* destination transport address of the given association. The returned
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* result should indicate whether the transmission of the HEARTBEAT
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* chunk to the destination address is successful.
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*
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* Mandatory attributes:
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*
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* o association id - local handle to the SCTP association
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*
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* o destination transport address - the transport address of the
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* association on which a heartbeat should be issued.
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*/
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DECLARE_PRIMITIVE(REQUESTHEARTBEAT);
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/* ADDIP
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* 3.1.1 Address Configuration Change Chunk (ASCONF)
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*
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* This chunk is used to communicate to the remote endpoint one of the
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* configuration change requests that MUST be acknowledged. The
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* information carried in the ASCONF Chunk uses the form of a
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* Type-Length-Value (TLV), as described in "3.2.1 Optional/
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* Variable-length Parameter Format" in RFC2960 [5], forall variable
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* parameters.
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*/
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DECLARE_PRIMITIVE(ASCONF);
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/* RE-CONFIG 5.1 */
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DECLARE_PRIMITIVE(RECONF);
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