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Merge "Reduce advertised ipv6 mtu by 16 to fit ethernet header"

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Treehugger Robot 2020-02-19 11:20:29 +00:00 • committed by Gerrit Code Review
commit b23d20fea7
1 changed files with 6 additions and 1 deletions
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7
Tethering/src/android/net/ip/IpServer.java
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@ -610,7 +610,12 @@ public class IpServer extends StateMachine {
if (v6only != null) {
params = new RaParams();
params.mtu = v6only.getMtu();
// We advertise an mtu lower by 16, which is the closest multiple of 8 >= 14,
// the ethernet header size. This makes kernel ebpf tethering offload happy.
// This hack should be reverted once we have the kernel fixed up.
// Note: this will automatically clamp to at least 1280 (ipv6 minimum mtu)
// see RouterAdvertisementDaemon.java putMtu()
params.mtu = v6only.getMtu() - 16;
params.hasDefaultRoute = v6only.hasIpv6DefaultRoute();
if (params.hasDefaultRoute) params.hopLimit = getHopLimit(v6only.getInterfaceName());