f02ba163891bab73a80332b4599a9d73083cb6c2
kernel >= 4.5 (with commit https://github.com/torvalds/linux/commit/32bc201e1974976b7d3fea9a9b17bb7392ca6394) supports RTA_EXPIRES netlink attribute to set router lifetime. This simply detect the kernel version (>=4.5) and set the lifetime properly, fallback to expiring route in userspace for kernel that doesnt support it. Signed-off-by: Daniel Dao <dqminh89@gmail.com>
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