bp
    Points to a buffer that is to contain an IPv6 routing header.
 bp_len
    Specifies the length, in bytes, of the buffer.
 type
    Specifies the type of routing header. The valid value is IPV6_
    RTHDR_TYPE_0 for IPv6 routing header type 0.
 segments
    Specifies the number of segments or addresses that are to be
    included in the routing header. The valid value is from 0 to 127,
    inclusive.