Match on IPv6 routing header

[!] --rt-type type
    Match the type (numeric).

[!] --rt-segsleft num[:num]
    Match the `segments left' field (range).

[!] --rt-len length
    Match the length of this header.

--rt-0-res
    Match the reserved field, too (type=0)

--rt-0-addrs addr[,addr...]
    Match type=0 addresses (list).

--rt-0-not-strict
    List of type=0 addresses is not a strict list.