r0 = socket$inet(0x2, 0x80003, 0xff)
ioctl$sock_inet_SIOCDELRT(r0, 0x890c, &(0x7f0000003740)={0x0, {0x2, 0x0, @multicast2}, {0x2, 0x0, @local}, {0x2, 0x0, @broadcast}, 0x240})