PacketReflector: Ignore IPv6 flow labels in ICMPv6 test
Since Linux kernel 4.2, net.ipv6.auto_flowlabels is set by default, and
therefore the request and reply may have different IPv6 flow label.
Bug: 31444338
Test: On a kernel 4.4 board, run com.android.cts.net.HostsideNetworkTests#testVpn
Test: On a kernel 3.18 board, run echo 1 > /proc/sys/net/ipv6/auto_flowlabels, then
com.android.cts.net.HostsideNetworkTests#testVpn
Change-Id: I913bbf91574239a24cb32ae908834eb951ea2010
diff --git a/tests/cts/hostside/app/src/com/android/cts/net/hostside/PacketReflector.java b/tests/cts/hostside/app/src/com/android/cts/net/hostside/PacketReflector.java
index dd0f792..a4a2956 100644
--- a/tests/cts/hostside/app/src/com/android/cts/net/hostside/PacketReflector.java
+++ b/tests/cts/hostside/app/src/com/android/cts/net/hostside/PacketReflector.java
@@ -151,6 +151,15 @@
request[hdrLen] = buf[hdrLen]; // Type.
request[hdrLen + 2] = buf[hdrLen + 2]; // Checksum byte 1.
request[hdrLen + 3] = buf[hdrLen + 3]; // Checksum byte 2.
+
+ // Since Linux kernel 4.2, net.ipv6.auto_flowlabels is set by default, and therefore
+ // the request and reply may have different IPv6 flow label: ignore that as well.
+ if (version == 6) {
+ request[1] = (byte)(request[1] & 0xf0 | buf[1] & 0x0f);
+ request[2] = buf[2];
+ request[3] = buf[3];
+ }
+
for (int i = 0; i < len; i++) {
if (buf[i] != request[i]) {
Log.i(TAG, "Received non-matching packet when expecting ping response.");