net/sctp/primitive.c

   1 /* SCTP kernel reference Implementation
   2  * Copyright (c) 1999-2000 Cisco, Inc.
   3  * Copyright (c) 1999-2001 Motorola, Inc.
   4  *
   5  * This file is part of the SCTP kernel reference Implementation
   6  *
   7  * These functions implement the SCTP primitive functions from Section 10.
   8  *
   9  * Note that the descriptions from the specification are USER level
  10  * functions--this file is the functions which populate the struct proto
  11  * for SCTP which is the BOTTOM of the sockets interface.
  12  *
  13  * The SCTP reference implementation is free software;
  14  * you can redistribute it and/or modify it under the terms of
  15  * the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2, or (at your option)
  17  * any later version.
  18  *
  19  * The SCTP reference implementation is distributed in the hope that it
  20  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  21  *                 ************************
  22  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  23  * See the GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with GNU CC; see the file COPYING.  If not, write to
  27  * the Free Software Foundation, 59 Temple Place - Suite 330,
  28  * Boston, MA 02111-1307, USA.
  29  *
  30  * Please send any bug reports or fixes you make to the
  31  * email address(es):
  32  *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  33  *
  34  * Or submit a bug report through the following website:
  35  *    http://www.sf.net/projects/lksctp
  36  *
  37  * Written or modified by:
  38  *    La Monte H.P. Yarroll <piggy@acm.org>
  39  *    Narasimha Budihal     <narasimha@refcode.org>
  40  *    Karl Knutson          <karl@athena.chicago.il.us>
  41  *    Ardelle Fan           <ardelle.fan@intel.com>
  42  *    Kevin Gao             <kevin.gao@intel.com>
  43  *
  44  * Any bugs reported given to us we will try to fix... any fixes shared will
  45  * be incorporated into the next SCTP release.
  46  */
  47
  48 #include <linux/types.h>
  49 #include <linux/list.h> /* For struct list_head */
  50 #include <linux/socket.h>
  51 #include <linux/ip.h>
  52 #include <linux/time.h> /* For struct timeval */
  53 #include <net/sock.h>
  54 #include <net/sctp/sctp.h>
  55 #include <net/sctp/sm.h>
  56
  57 #define DECLARE_PRIMITIVE(name) \
  58 /* This is called in the code as sctp_primitive_ ## name.  */ \
  59 int sctp_primitive_ ## name(struct sctp_association *asoc, \
  60                             void *arg) { \
  61         int error = 0; \
  62         sctp_event_t event_type; sctp_subtype_t subtype; \
  63         sctp_state_t state; \
  64         struct sctp_endpoint *ep; \
  65         \
  66         event_type = SCTP_EVENT_T_PRIMITIVE; \
  67         subtype = SCTP_ST_PRIMITIVE(SCTP_PRIMITIVE_ ## name); \
  68         state = asoc ? asoc->state : SCTP_STATE_CLOSED; \
  69         ep = asoc ? asoc->ep : NULL; \
  70         \
  71         error = sctp_do_sm(event_type, subtype, state, ep, asoc, \
  72                            arg, GFP_KERNEL); \
  73         return error; \
  74 }
  75
  76 /* 10.1 ULP-to-SCTP
  77  * B) Associate
  78  *
  79  * Format: ASSOCIATE(local SCTP instance name, destination transport addr,
  80  *         outbound stream count)
  81  * -> association id [,destination transport addr list] [,outbound stream
  82  *    count]
  83  *
  84  * This primitive allows the upper layer to initiate an association to a
  85  * specific peer endpoint.
  86  *
  87  * This version assumes that asoc is fully populated with the initial
  88  * parameters.  We then return a traditional kernel indicator of
  89  * success or failure.
  90  */
  91
  92 /* This is called in the code as sctp_primitive_ASSOCIATE.  */
  93
  94 DECLARE_PRIMITIVE(ASSOCIATE)
  95
  96 /* 10.1 ULP-to-SCTP
  97  * C) Shutdown
  98  *
  99  * Format: SHUTDOWN(association id)
 100  * -> result
 101  *
 102  * Gracefully closes an association. Any locally queued user data
 103  * will be delivered to the peer. The association will be terminated only
 104  * after the peer acknowledges all the SCTP packets sent.  A success code
 105  * will be returned on successful termination of the association. If
 106  * attempting to terminate the association results in a failure, an error
 107  * code shall be returned.
 108  */
 109
 110 DECLARE_PRIMITIVE(SHUTDOWN);
 111
 112 /* 10.1 ULP-to-SCTP
 113  * C) Abort
 114  *
 115  * Format: Abort(association id [, cause code])
 116  * -> result
 117  *
 118  * Ungracefully closes an association. Any locally queued user data
 119  * will be discarded and an ABORT chunk is sent to the peer. A success
 120  * code will be returned on successful abortion of the association. If
 121  * attempting to abort the association results in a failure, an error
 122  * code shall be returned.
 123  */
 124
 125 DECLARE_PRIMITIVE(ABORT);
 126
 127 /* 10.1 ULP-to-SCTP
 128  * E) Send
 129  *
 130  * Format: SEND(association id, buffer address, byte count [,context]
 131  *         [,stream id] [,life time] [,destination transport address]
 132  *         [,unorder flag] [,no-bundle flag] [,payload protocol-id] )
 133  * -> result
 134  *
 135  * This is the main method to send user data via SCTP.
 136  *
 137  * Mandatory attributes:
 138  *
 139  *  o association id - local handle to the SCTP association
 140  *
 141  *  o buffer address - the location where the user message to be
 142  *    transmitted is stored;
 143  *
 144  *  o byte count - The size of the user data in number of bytes;
 145  *
 146  * Optional attributes:
 147  *
 148  *  o context - an optional 32 bit integer that will be carried in the
 149  *    sending failure notification to the ULP if the transportation of
 150  *    this User Message fails.
 151  *
 152  *  o stream id - to indicate which stream to send the data on. If not
 153  *    specified, stream 0 will be used.
 154  *
 155  *  o life time - specifies the life time of the user data. The user data
 156  *    will not be sent by SCTP after the life time expires. This
 157  *    parameter can be used to avoid efforts to transmit stale
 158  *    user messages. SCTP notifies the ULP if the data cannot be
 159  *    initiated to transport (i.e. sent to the destination via SCTP's
 160  *    send primitive) within the life time variable. However, the
 161  *    user data will be transmitted if SCTP has attempted to transmit a
 162  *    chunk before the life time expired.
 163  *
 164  *  o destination transport address - specified as one of the destination
 165  *    transport addresses of the peer endpoint to which this packet
 166  *    should be sent. Whenever possible, SCTP should use this destination
 167  *    transport address for sending the packets, instead of the current
 168  *    primary path.
 169  *
 170  *  o unorder flag - this flag, if present, indicates that the user
 171  *    would like the data delivered in an unordered fashion to the peer
 172  *    (i.e., the U flag is set to 1 on all DATA chunks carrying this
 173  *    message).
 174  *
 175  *  o no-bundle flag - instructs SCTP not to bundle this user data with
 176  *    other outbound DATA chunks. SCTP MAY still bundle even when
 177  *    this flag is present, when faced with network congestion.
 178  *
 179  *  o payload protocol-id - A 32 bit unsigned integer that is to be
 180  *    passed to the peer indicating the type of payload protocol data
 181  *    being transmitted. This value is passed as opaque data by SCTP.
 182  */
 183
 184 DECLARE_PRIMITIVE(SEND);
 185
 186 /* 10.1 ULP-to-SCTP
 187  * J) Request Heartbeat
 188  *
 189  * Format: REQUESTHEARTBEAT(association id, destination transport address)
 190  *
 191  * -> result
 192  *
 193  * Instructs the local endpoint to perform a HeartBeat on the specified
 194  * destination transport address of the given association. The returned
 195  * result should indicate whether the transmission of the HEARTBEAT
 196  * chunk to the destination address is successful.
 197  *
 198  * Mandatory attributes:
 199  *
 200  * o association id - local handle to the SCTP association
 201  *
 202  * o destination transport address - the transport address of the
 203  *   association on which a heartbeat should be issued.
 204  */
 205
 206 DECLARE_PRIMITIVE(REQUESTHEARTBEAT);
 207
 208 /* ADDIP
 209 * 3.1.1 Address Configuration Change Chunk (ASCONF)
 210 *
 211 * This chunk is used to communicate to the remote endpoint one of the
 212 * configuration change requests that MUST be acknowledged.  The
 213 * information carried in the ASCONF Chunk uses the form of a
 214 * Type-Length-Value (TLV), as described in "3.2.1 Optional/
 215 * Variable-length Parameter Format" in RFC2960 [5], forall variable
 216 * parameters.
 217 */
 218
 219 DECLARE_PRIMITIVE(ASCONF);