Android system tun#847
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The FFI's create_tun_fd only ran TUNSETIFF, but the downstream tun/android.rs assumes the fd is fully configured (matching the mobile/VpnService contract). Result: the interface had no IP, was administratively down, and could not carry traffic. Extend create_tun_fd to assign the node's IPv6 with the global subnet's prefix length (installs the on-link 400::/7 route), set MTU 1400 to match tun/android.rs's LINK_MTU, and bring the interface up via SIOCSIFFLAGS.
Previously android always used the same code which was an issue for system services. Signed-off-by: Lee Smet <lee.smet@hotmail.com>
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