release/src/router/openvpn/shaper.c

   1 /*
   2  *  OpenVPN -- An application to securely tunnel IP networks
   3  *             over a single UDP port, with support for SSL/TLS-based
   4  *             session authentication and key exchange,
   5  *             packet encryption, packet authentication, and
   6  *             packet compression.
   7  *
   8  *  Copyright (C) 2002-2009 OpenVPN Technologies, Inc. <sales@openvpn.net>
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2
  12  *  as published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program (see the file COPYING included with this
  21  *  distribution); if not, write to the Free Software Foundation, Inc.,
  22  *  59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "syshead.h"
  26 #include "shaper.h"
  27 #include "memdbg.h"
  28
  29 #ifdef HAVE_GETTIMEOFDAY
  30
  31 /*
  32  * We want to wake up in delay microseconds.  If timeval is larger
  33  * than delay, set timeval to delay.
  34  */
  35 bool
  36 shaper_soonest_event (struct timeval *tv, int delay)
  37 {
  38   bool ret = false;
  39   if (delay < 1000000)
  40     {
  41       if (tv->tv_sec)
  42         {
  43           tv->tv_sec = 0;
  44           tv->tv_usec = delay;
  45           ret = true;
  46         }
  47       else if (delay < tv->tv_usec)
  48         {
  49           tv->tv_usec = delay;
  50           ret = true;
  51         }
  52     }
  53   else
  54     {
  55       const int sec = delay / 1000000;
  56       const int usec = delay % 1000000;
  57
  58       if (sec < tv->tv_sec)
  59         {
  60           tv->tv_sec = sec;
  61           tv->tv_usec = usec;
  62           ret = true;
  63         }
  64       else if (sec == tv->tv_sec)
  65         {
  66           if (usec < tv->tv_usec)
  67             {
  68               tv->tv_usec = usec;
  69               ret = true;
  70             }
  71         }
  72     }
  73 #ifdef SHAPER_DEBUG
  74   dmsg (D_SHAPER_DEBUG, "SHAPER shaper_soonest_event sec=%d usec=%d ret=%d",
  75        (int)tv->tv_sec, (int)tv->tv_usec, (int)ret);
  76 #endif
  77   return ret;
  78 }
  79
  80 void
  81 shaper_reset_wakeup (struct shaper *s)
  82 {
  83   CLEAR (s->wakeup);
  84 }
  85
  86 void
  87 shaper_msg (struct shaper *s)
  88 {
  89   msg (M_INFO, "Output Traffic Shaping initialized at %d bytes per second",
  90        s->bytes_per_second);
  91 }
  92
  93 #else
  94 static void dummy(void) {}
  95 #endif /* HAVE_GETTIMEOFDAY */