Hi. I've written a simple traffic shaper. It works pretty well but I don't have tested a lot. I hope you can do.
Bye!! -- Gustavo Chaín Dumit http://0xff.cl
patch
Description: Binary data
#include "defs.h"
unsigned long inline
tv2ms(struct timeval tv)
{
register unsigned long ms = (tv.tv_sec * 1000)+(tv.tv_usec / 1000);
return ms ? ms : 1;
}
shaper_stats_t stats;
shaper_ops_t ops;
void
shaper_init(size_t max_speed)
{
#define MIN_SPEED 64
if (0 < max_speed) {
max_speed = MAX(MIN_SPEED, max_speed);
stats.enabled = 1;
}
else {
max_speed = 0;
stats.enabled = 0;
}
stats.max_speed = max_speed / 8 * 1024;
stats.bytes = 0;
gettimeofday(&stats.last_time, NULL);
// TODO: Init mutex
}
void
shaper_update(size_t bytes)
{
stats.bytes += bytes;
}
int
shaper_eval(void)
{
static struct timeval now, deltat;
register unsigned long speed;
#ifndef timersub
#define timersub(a, b, result) \
do { \
(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
if ((result)->tv_usec < 0) { \
--(result)->tv_sec; \
(result)->tv_usec += 1000000; \
} \
} while (0)
#endif
gettimeofday(&now, NULL);
timersub(&now, &stats.last_time, &deltat);
// TODO: Mutex Lock
speed = stats.bytes * 1000 / tv2ms(deltat);
// TODO: Mutex unLock
if ( stats.max_speed && (speed > stats.max_speed) ) {
usleep(tv2ms(deltat));
return SHAPER_LIMIT;
}
if (now.tv_sec > stats.last_time.tv_sec ){
// TODO: Mutex Lock
stats.last_time = now;
stats.bytes = 0;
// TODO: Mutex unLock
}
return SHAPER_OK;
}
#ifndef SHAPER_HEADER_INCLUDED
#define SHAPER_HEADER_INCLUDED
#include <sys/time.h>
#define SHAPER_LIMIT -1
#define SHAPER_OK 0
typedef struct {
size_t max_speed;
size_t bytes;
struct timeval last_time;
int enabled;
// TODO: thread lock
} shaper_stats_t;
typedef struct {
void (*update) (size_t size);
int (*eval) (void);
} shaper_ops_t;
void shaper_init (size_t max_speed);
void shaper_update (size_t bytes);
int shaper_eval (void);
#endif /* SHAPER_HEADER_INCLUDED */
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