apf: Remove IPv6 NAT-T keepalive related codes and ApfTest improvement
Remove IPv6 related codes since we don't support IPv6 NAT-T keepalive
as the kernel doesn't support IPv6 UDP encapsulation.
Renaming keepaliveAck to keepaliveResponce since NAT-T keeaplive
response is not an ack. Also, add generateV4NattKeepaliveFilters()
if multicast filter is disabled.
Verify incoming packet contains 1 byte payload but it is not 0xff will
pass NAT-T keepalive filter.
Test: atest FrameworksNetTests
2 files changed