r0 = socket$inet6_udp(0xa, 0x2, 0x0)
getsockopt$inet6_IPV6_FLOWLABEL_MGR(r0, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x0, 0x0, 0x0, 0x9}, &(0x7f0000000100)=0x20)