1 pub const AF_INET: i32 = 2; 2 pub const AF_INET6: i32 = 10; 3 4 pub const IPV4_MIN_MTU: u32 = 68; 5 pub const IPV6_MIN_MTU: u32 = 1280; 6 7 pub const PRIO_MIN: i8 = -20; 8 pub const PRIO_MAX: i8 = 20;