Annotation of embedaddon/bird2/lib/tbf.c, revision 1.1.1.1
1.1 misho 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: #include "lib/timer.h"
12:
13: int
14: tbf_limit(struct tbf *f)
15: {
16: btime delta = current_time() - f->timestamp;
17:
18: if (delta > 0)
19: {
20: u64 next = f->count + delta * f->rate;
21: u64 burst = (u64) f->burst << 20;
22: f->count = MIN(next, burst);
23: f->timestamp += delta;
24: }
25:
26: if (f->count < 1000000)
27: {
28: f->drop++;
29: return 1;
30: }
31: else
32: {
33: f->count -= 1000000;
34: f->drop = 0;
35: return 0;
36: }
37: }
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