bpf, selftest: Fix flaky tcp_hdr_options test when adding addr to lo
The tcp_hdr_options test adds a "::eB9F" addr to the lo dev. However, this non loopback address will have a race on ipv6 dad which may lead to EADDRNOTAVAIL error from time to time. Even nodad is used in the iproute2 command, there is still a race in when the route will be added. This will then lead to ENETUNREACH from time to time. To avoid the above, this patch uses the default loopback address "::1" to do the test. Fixes: ad2f8eb0 ("bpf: selftests: Tcp header options") Reported-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20201012234940.1707941-1-kafai@fb.com
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