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38 lines
632 B
C
38 lines
632 B
C
/*
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* BIRD Library -- Token Bucket Filter
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*
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* (c) 2014 Ondrej Zajicek <santiago@crfreenet.org>
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* (c) 2014 CZ.NIC z.s.p.o.
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include "nest/bird.h"
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#include "lib/timer.h"
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int
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tbf_limit(struct tbf *f)
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{
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btime delta = current_time() - f->timestamp;
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if (delta > 0)
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{
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u64 next = f->count + delta * f->rate;
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u64 burst = (u64) f->burst << 20;
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f->count = MIN(next, burst);
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f->timestamp += delta;
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}
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if (f->count < 1000000)
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{
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f->drop++;
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return 1;
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}
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else
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{
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f->count -= 1000000;
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f->drop = 0;
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return 0;
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}
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}
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