selftests: pmtu: add basic IPv4 and IPv6 PMTU tests
Commit d1f1b9cb ("selftests: net: Introduce first PMTU test") and follow-ups introduced some PMTU tests, but they all rely on tunneling, and, particularly, on VTI. These new tests use simple routing to exercise the generation and update of PMTU exceptions in IPv4 and IPv6. Signed-off-by: NSabrina Dubroca <sd@queasysnail.net> Signed-off-by: NStefano Brivio <sbrivio@redhat.com> Reviewed-by: NDavid Ahern <dsahern@gmail.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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