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Ensure no memory allocations happen at hot path

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cathugger 2018-07-30 12:43:34 +00:00
parent c4e6894d6a
commit 67b8a7a53d
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GPG Key ID: 9BADDA2DAF6F01A8
1 changed files with 4 additions and 3 deletions
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7
src/yggdrasil/session.go
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@ -72,7 +72,8 @@ func (s *sessionInfo) update(p *sessionPing) bool {
if p.MTU >= 1280 || p.MTU == 0 { if p.MTU >= 1280 || p.MTU == 0 {
s.theirMTU = p.MTU s.theirMTU = p.MTU
} }
s.coords = append([]byte{}, p.Coords...) // allocate enough space for additional coords
s.coords = append(make([]byte, 0, len(p.Coords)+11), p.Coords...)
now := time.Now() now := time.Now()
s.time = now s.time = now
s.tstamp = p.Tstamp s.tstamp = p.Tstamp
@ -426,8 +427,8 @@ func (sinfo *sessionInfo) doSend(bs []byte) {
// To prevent using empty session keys // To prevent using empty session keys
return return
} }
var coords []byte // code isn't multithreaded so appending to this is safe
coords = append(coords, sinfo.coords...) coords := sinfo.coords
// Read IPv6 flowlabel field (20 bits). // Read IPv6 flowlabel field (20 bits).
// Assumes packet at least contains IPv6 header. // Assumes packet at least contains IPv6 header.
flowkey := uint64(bs[1]&0x0f)<<16 | uint64(bs[2])<<8 | uint64(bs[3]) flowkey := uint64(bs[1]&0x0f)<<16 | uint64(bs[2])<<8 | uint64(bs[3])