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Make a v4 nattKeepalivePacket helper method

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This is a preparation change for the subsequent changes to
separate the logic for constructing a v4 NAT-T keepalive
packets to a dedicated method.

Bug: 196453719
Test: atest FrameworksNetTests
Change-Id: If72b4875e65a547bbf90367eacce7b145358006a
This commit is contained in:
chiachangwang
2023-06-06 03:12:24 +00:00
committed by Chiachang Wang
parent f2b38772ac
commit df347448a1
1 changed files with 10 additions and 3 deletions
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13
framework/src/android/net/NattKeepalivePacketData.java
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@@ -55,15 +55,22 @@ public final class NattKeepalivePacketData extends KeepalivePacketData implement
public static NattKeepalivePacketData nattKeepalivePacket(
InetAddress srcAddress, int srcPort, InetAddress dstAddress, int dstPort)
throws InvalidPacketException {
if (dstPort != NattSocketKeepalive.NATT_PORT) {
throw new InvalidPacketException(ERROR_INVALID_PORT);
}
if (!(srcAddress instanceof Inet4Address) || !(dstAddress instanceof Inet4Address)) {
throw new InvalidPacketException(ERROR_INVALID_IP_ADDRESS);
}
if (dstPort != NattSocketKeepalive.NATT_PORT) {
throw new InvalidPacketException(ERROR_INVALID_PORT);
}
return nattKeepalivePacketv4(
(Inet4Address) srcAddress, srcPort,
(Inet4Address) dstAddress, dstPort);
}
private static NattKeepalivePacketData nattKeepalivePacketv4(
Inet4Address srcAddress, int srcPort, Inet4Address dstAddress, int dstPort)
throws InvalidPacketException {
int length = IPV4_HEADER_LENGTH + UDP_HEADER_LENGTH + 1;
ByteBuffer buf = ByteBuffer.allocate(length);
buf.order(ByteOrder.BIG_ENDIAN);