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net/packet: represent IP6 as two uint64s.

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For the operations we perform on these types (mostly net6.Contains),
this encoding is much faster.

Part of #19.

name                   old time/op    new time/op    delta
Filter/icmp4-8           27.5ns ± 1%    28.0ns ± 2%   +1.89%  (p=0.016 n=5+5)
Filter/tcp4_syn_in-8     38.8ns ± 2%    38.3ns ± 1%   -1.24%  (p=0.024 n=5+5)
Filter/tcp4_syn_out-8    27.6ns ±12%    24.6ns ± 1%     ~     (p=0.063 n=5+5)
Filter/udp4_in-8         71.5ns ± 5%    65.9ns ± 1%   -7.94%  (p=0.008 n=5+5)
Filter/udp4_out-8         132ns ±13%     119ns ± 1%  -10.29%  (p=0.008 n=5+5)
Filter/icmp6-8            169ns ±10%      54ns ± 1%  -68.35%  (p=0.008 n=5+5)
Filter/tcp6_syn_in-8      149ns ± 6%      43ns ± 1%  -71.11%  (p=0.008 n=5+5)
Filter/tcp6_syn_out-8    37.7ns ± 4%    24.3ns ± 3%  -35.51%  (p=0.008 n=5+5)
Filter/udp6_in-8          179ns ± 5%     103ns ± 1%  -42.75%  (p=0.008 n=5+5)
Filter/udp6_out-8         156ns ± 3%     191ns ± 1%  +22.54%  (p=0.008 n=5+5)

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2020-11-12 02:56:15 -08:00
parent 04ff3c91ee
commit 2d604b3791
3 changed files with 42 additions and 32 deletions
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6
net/packet/packet.go
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@ -248,8 +248,10 @@ func (q *Parsed) decode6(b []byte) {
return
}
copy(q.SrcIP6[:], b[8:24])
copy(q.DstIP6[:], b[24:40])
q.SrcIP6.Hi = binary.BigEndian.Uint64(b[8:16])
q.SrcIP6.Lo = binary.BigEndian.Uint64(b[16:24])
q.DstIP6.Hi = binary.BigEndian.Uint64(b[24:32])
q.DstIP6.Lo = binary.BigEndian.Uint64(b[32:40])
// We don't support any IPv6 extension headers. Don't try to
// be clever. Therefore, the IP subprotocol always starts at