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-rw-r--r--openvpn/shaper.h178
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diff --git a/openvpn/shaper.h b/openvpn/shaper.h
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--- a/openvpn/shaper.h
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-/*
- * OpenVPN -- An application to securely tunnel IP networks
- * over a single UDP port, with support for SSL/TLS-based
- * session authentication and key exchange,
- * packet encryption, packet authentication, and
- * packet compression.
- *
- * Copyright (C) 2002-2005 OpenVPN Solutions LLC <info@openvpn.net>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program (see the file COPYING included with this
- * distribution); if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#ifndef SHAPER_H
-#define SHAPER_H
-
-/*#define SHAPER_DEBUG*/
-
-#ifdef HAVE_GETTIMEOFDAY
-
-#include "basic.h"
-#include "integer.h"
-#include "misc.h"
-#include "error.h"
-#include "interval.h"
-
-/*
- * A simple traffic shaper for
- * the output direction.
- */
-
-#define SHAPER_MIN 100 /* bytes per second */
-#define SHAPER_MAX 100000000
-
-#define SHAPER_MAX_TIMEOUT 10 /* seconds */
-
-#define SHAPER_USE_FP
-
-struct shaper
-{
- int bytes_per_second;
- struct timeval wakeup;
-
-#ifdef SHAPER_USE_FP
- double factor;
-#else
- int factor;
-#endif
-};
-
-void shaper_msg (struct shaper *s);
-void shaper_reset_wakeup (struct shaper *s);
-
-/*
- * We want to wake up in delay microseconds. If timeval is larger
- * than delay, set timeval to delay.
- */
-bool shaper_soonest_event (struct timeval *tv, int delay);
-
-/*
- * inline functions
- */
-
-static inline void
-shaper_reset (struct shaper *s, int bytes_per_second)
-{
- s->bytes_per_second = bytes_per_second ? constrain_int (bytes_per_second, SHAPER_MIN, SHAPER_MAX) : 0;
-
-#ifdef SHAPER_USE_FP
- s->factor = 1000000.0 / (double)s->bytes_per_second;
-#else
- s->factor = 1000000 / s->bytes_per_second;
-#endif
-}
-
-static inline void
-shaper_init (struct shaper *s, int bytes_per_second)
-{
- shaper_reset (s, bytes_per_second);
- shaper_reset_wakeup (s);
-}
-
-static inline int
-shaper_current_bandwidth (struct shaper *s)
-{
- return s->bytes_per_second;
-}
-
-/*
- * Returns traffic shaping delay in microseconds relative to current
- * time, or 0 if no delay.
- */
-static inline int
-shaper_delay (struct shaper* s)
-{
- struct timeval tv;
- int delay = 0;
-
- if (tv_defined (&s->wakeup))
- {
- ASSERT (!gettimeofday (&tv, NULL));
- delay = tv_subtract (&s->wakeup, &tv, SHAPER_MAX_TIMEOUT);
-#ifdef SHAPER_DEBUG
- dmsg (D_SHAPER_DEBUG, "SHAPER shaper_delay delay=%d", delay);
-#endif
- }
-
- return delay > 0 ? delay : 0;
-}
-
-
-/*
- * We are about to send a datagram of nbytes bytes.
- *
- * Compute when we can send another datagram,
- * based on target throughput (s->bytes_per_second).
- */
-static inline void
-shaper_wrote_bytes (struct shaper* s, int nbytes)
-{
- struct timeval tv;
-
- /* compute delay in microseconds */
- tv.tv_sec = 0;
-#ifdef SHAPER_USE_FP
- tv.tv_usec = min_int ((int)((double)max_int (nbytes, 100) * s->factor), (SHAPER_MAX_TIMEOUT*1000000));
-#else
- tv.tv_usec = s->bytes_per_second
- ? min_int (max_int (nbytes, 100) * s->factor, (SHAPER_MAX_TIMEOUT*1000000))
- : 0;
-#endif
-
- if (tv.tv_usec)
- {
- ASSERT (!gettimeofday (&s->wakeup, NULL));
- tv_add (&s->wakeup, &tv);
-
-#ifdef SHAPER_DEBUG
- dmsg (D_SHAPER_DEBUG, "SHAPER shaper_wrote_bytes bytes=%d delay=%d sec=%d usec=%d",
- nbytes,
- (int)tv.tv_usec,
- (int)s->wakeup.tv_sec,
- (int)s->wakeup.tv_usec);
-#endif
- }
-}
-
-#if 0
-/*
- * Increase/Decrease bandwidth by a percentage.
- *
- * Return true if bandwidth changed.
- */
-static inline bool
-shaper_change_pct (struct shaper *s, int pct)
-{
- const int orig_bandwidth = s->bytes_per_second;
- const int new_bandwidth = orig_bandwidth + (orig_bandwidth * pct / 100);
- ASSERT (s->bytes_per_second);
- shaper_reset (s, new_bandwidth);
- return s->bytes_per_second != orig_bandwidth;
-}
-#endif
-
-#endif /* HAVE_GETTIMEOFDAY */
-
-#endif