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Merge "Reduce advertised ipv6 mtu by 16 to fit ethernet header" am: b1ad41b62e

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Change-Id: Iceff50ab7118e13ce1669ec3890e71c9d29cb019
This commit is contained in:
Automerger Merge Worker
2020-02-19 11:34:52 +00:00
parent 55e1510484 b1ad41b62e
commit 376e086fef
1 changed files with 6 additions and 1 deletions
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7
packages/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());