LXR linux/net/sctp/command.c

   1/* SCTP kernel implementation Copyright (C) 1999-2001
   2 * Cisco, Motorola, and IBM
   3 * Copyright 2001 La Monte H.P. Yarroll
   4 *
   5 * This file is part of the SCTP kernel implementation
   6 *
   7 * These functions manipulate sctp command sequences.
   8 *
   9 * This SCTP implementation is free software;
  10 * you can redistribute it and/or modify it under the terms of
  11 * the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2, or (at your option)
  13 * any later version.
  14 *
  15 * This SCTP implementation is distributed in the hope that it
  16 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
  17 *                 ************************
  18 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  19 * See the GNU General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU General Public License
  22 * along with GNU CC; see the file COPYING.  If not, write to
  23 * the Free Software Foundation, 59 Temple Place - Suite 330,
  24 * Boston, MA 02111-1307, USA.
  25 *
  26 * Please send any bug reports or fixes you make to the
  27 * email address(es):
  28 *    lksctp developers <lksctp-developers@lists.sourceforge.net>
  29 *
  30 * Or submit a bug report through the following website:
  31 *    http://www.sf.net/projects/lksctp
  32 *
  33 * Written or modified by:
  34 *    La Monte H.P. Yarroll <piggy@acm.org>
  35 *    Karl Knutson <karl@athena.chicago.il.us>
  36 *
  37 * Any bugs reported given to us we will try to fix... any fixes shared will
  38 * be incorporated into the next SCTP release.
  39 */
  40
  41#include <linux/types.h>
  42#include <net/sctp/sctp.h>
  43#include <net/sctp/sm.h>
  44
  45/* Initialize a block of memory as a command sequence. */
  46int sctp_init_cmd_seq(sctp_cmd_seq_t *seq)
  47{
  48        memset(seq, 0, sizeof(sctp_cmd_seq_t));
  49        return 1;               /* We always succeed.  */
  50}
  51
  52/* Add a command to a sctp_cmd_seq_t.
  53 * Return 0 if the command sequence is full.
  54 */
  55void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj)
  56{
  57        BUG_ON(seq->next_free_slot >= SCTP_MAX_NUM_COMMANDS);
  58
  59        seq->cmds[seq->next_free_slot].verb = verb;
  60        seq->cmds[seq->next_free_slot++].obj = obj;
  61}
  62
  63/* Return the next command structure in a sctp_cmd_seq.
  64 * Returns NULL at the end of the sequence.
  65 */
  66sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq)
  67{
  68        sctp_cmd_t *retval = NULL;
  69
  70        if (seq->next_cmd < seq->next_free_slot)
  71                retval = &seq->cmds[seq->next_cmd++];
  72
  73        return retval;
  74}
  75
  76