lib/tbf.c

   1 /*
   2  *      BIRD Library -- Token Bucket Filter
   3  *
   4  *      (c) 2014 Ondrej Zajicek <santiago@crfreenet.org>
   5  *      (c) 2014 CZ.NIC z.s.p.o.
   6  *
   7  *      Can be freely distributed and used under the terms of the GNU GPL.
   8  */
   9
  10 #include "nest/bird.h"
  11
  12 void
  13 tbf_update(struct tbf *f)
  14 {
  15   bird_clock_t delta = now - f->timestamp;
  16
  17   if (delta == 0)
  18     return;
  19
  20   f->timestamp = now;
  21
  22   if ((0 < delta) && (delta < f->burst))
  23   {
  24     u32 next = f->count + delta * f->rate;
  25     f->count = MIN(next, f->burst);
  26   }
  27   else
  28     f->count = f->burst;
  29 }