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Currently getsockopt does not support IP_ROUTER_ALERT and IPV6_ROUTER_ALERT, and we are unable to get the values of these two socket options through getsockopt. This patch adds getsockopt support for IP_ROUTER_ALERT and IPV6_ROUTER_ALERT. Signed-off-by: Juntong Deng <juntong.deng@outlook.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>