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. */
  39 int 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  */
  48 void 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  */
  59 sctp_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