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[CLATJ#8] ClatCoordinator: select IPv6 address with checksum-neutral IID

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Select a local 464xlat IPv6 address for clatd. The IPv6 address has
checksum-neutral IID. The native function is moved from netd to
libclat. Its test is moved from netd as well.

Bug: 212345928
Test: flash and boot
Run "atest ClatCoordinatorTest" in a followup commit.

Change-Id: I11520e5c086e475999847d829dd6341b14199b39
This commit is contained in:
Hungming Chen
2021-12-25 18:20:08 +08:00
parent e2cf055590
commit 884c0a122c
2 changed files with 63 additions and 0 deletions
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20
service/src/com/android/server/connectivity/ClatCoordinator.java
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@@ -66,6 +66,15 @@ public class ClatCoordinator {
throws IOException {
return selectIpv4Address(v4addr, prefixlen);
}
/**
* Generate a checksum-neutral IID.
*/
@NonNull
public String jniGenerateIpv6Address(@NonNull String iface, @NonNull String v4,
@NonNull String prefix64) throws IOException {
return generateIpv6Address(iface, v4, prefix64);
}
}
public ClatCoordinator(@NonNull Dependencies deps) {
@@ -91,10 +100,21 @@ public class ClatCoordinator {
throw new IOException("no IPv4 addresses were available for clat: " + e);
}
// [2] Generate a checksum-neutral IID.
final String pfx96 = nat64Prefix.getAddress().getHostAddress();
final String v6;
try {
v6 = mDeps.jniGenerateIpv6Address(iface, v4, pfx96);
} catch (IOException e) {
throw new IOException("no IPv6 addresses were available for clat: " + e);
}
// TODO: start clatd and returns local xlat464 v6 address.
return null;
}
private static native String selectIpv4Address(String v4addr, int prefixlen)
throws IOException;
private static native String generateIpv6Address(String iface, String v4, String prefix64)
throws IOException;
}