selftests: add test script for bareudp tunnels
Test different encapsulation modes of the bareudp module: * Unicast MPLS, * IPv4 only, * IPv4 in multiproto mode (that is, IPv4 and IPv6), * IPv6. Each mode is tested with both an IPv4 and an IPv6 underlay. v2: * Add build dependencies in config file (Willem de Bruijn). * The MPLS test now uses its own IP addresses. This minimises the amount of cleanup between tests and simplifies the script. * Verify that iproute2 supports bareudp tunnels before running the script (and other minor usability improvements). Signed-off-by: Guillaume Nault <gnault@redhat.com> Link: https://lore.kernel.org/r/8abc0e58f8a7eeb404f82466505a73110bc43ab8.1604088587.git.gnault@redhat.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>
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