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, see
  23 * <http://www.gnu.org/licenses/>.
  24 *
  25 * Please send any bug reports or fixes you make to the
  26 * email address(es):
  27 *    lksctp developers <linux-sctp@vger.kernel.org>
  28 *
  29 * Written or modified by:
  30 *    La Monte H.P. Yarroll <piggy@acm.org>
  31 *    Karl Knutson <karl@athena.chicago.il.us>
  32 */
  33
  34#include <linux/types.h>
  35#include <net/sctp/sctp.h>
  36#include <net/sctp/sm.h>
  37
  38/* Initialize a block of memory as a command sequence. */
  39int sctp_init_cmd_seq(sctp_cmd_seq_t *seq)
  40{
  41        memset(seq, 0, sizeof(sctp_cmd_seq_t));
  42        return 1;               /* We always succeed.  */
  43}
  44
  45/* Add a command to a sctp_cmd_seq_t.
  46 * Return 0 if the command sequence is full.
  47 */
  48void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj)
  49{
  50        BUG_ON(seq->next_free_slot >= SCTP_MAX_NUM_COMMANDS);
  51
  52        seq->cmds[seq->next_free_slot].verb = verb;
  53        seq->cmds[seq->next_free_slot++].obj = obj;
  54}
  55
  56/* Return the next command structure in a sctp_cmd_seq.
  57 * Returns NULL at the end of the sequence.
  58 */
  59sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq)
  60{
  61        sctp_cmd_t *retval = NULL;
  62
  63        if (seq->next_cmd < seq->next_free_slot)
  64                retval = &seq->cmds[seq->next_cmd++];
  65
  66        return retval;
  67}
  68
  69