LineageOS/android_packages_modules_Connectivity
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Lower CLAT max MTU from 65536 to 1528.

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Android's clat is for reaching the internet, which in general
never has an ipv4 L3 mtu higher than 1500.

(We could probably hit this on a jumboframe enabled IPv6-only
wifi network [ http://b/292057969#comment18 ] where RA claims
MTU of 9K [9170])

Bug: 292057969
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I7a32455571458b8a3f1121ad980d54323b2ef06b
This commit is contained in:
Maciej Żenczykowski
2023-07-26 10:26:27 +00:00
parent 868859d4ef
commit 9f94648b7f
2 changed files with 5 additions and 5 deletions
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6
tests/unit/java/com/android/server/connectivity/ClatCoordinatorTest.java
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@@ -508,10 +508,10 @@ public class ClatCoordinatorTest {
// Expected mtu is that the detected mtu minus MTU_DELTA(28).
assertEquals(1372, ClatCoordinator.adjustMtu(1400));
assertEquals(1472, ClatCoordinator.adjustMtu(ETHER_MTU));
assertEquals(65508, ClatCoordinator.adjustMtu(CLAT_MAX_MTU));
assertEquals(1500, ClatCoordinator.adjustMtu(CLAT_MAX_MTU));
// Expected mtu is that CLAT_MAX_MTU(65536) minus MTU_DELTA(28).
assertEquals(65508, ClatCoordinator.adjustMtu(CLAT_MAX_MTU + 1 /* over maximum mtu */));
// Expected mtu is that CLAT_MAX_MTU(1528) minus MTU_DELTA(28).
assertEquals(1500, ClatCoordinator.adjustMtu(CLAT_MAX_MTU + 1 /* over maximum mtu */));
}
private void verifyDump(final ClatCoordinator coordinator, boolean clatStarted) {