8107f4731e43b5571a40aa5df881dd8b5f0d3fe6
The flag IFA_F_NOPREFIXROUTE was introduced in kernel-3.14. But even if the kernel does not support the flag, it should be just ignored. So, it is not necessary to do the fallback logic. Moreover, the current logic is not a fallback mechanism but just retrying. So, it should not work. Let's drop that.
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