Match IPVS connection properties.

[!] --ipvs
    packet belongs to an IPVS connection

Any of the following options implies --ipvs (even negated)

[!] --vproto protocol
    VIP protocol to match; by number or name, e.g. "tcp"

[!] --vaddr address[/mask]
    VIP address to match

[!] --vport port
    VIP port to match; by number or name, e.g. "http"

--vdir {ORIGINAL|REPLY}
    flow direction of packet

[!] --vmethod {GATE|IPIP|MASQ}
    IPVS forwarding method used

[!] --vportctl port
    VIP port of the controlling connection to match, e.g. 21 for FTP