r0 = socket$inet6(0xa, 0x2, 0x0)
getsockopt$inet6_IPV6_FLOWLABEL_MGR(r0, 0x29, 0x20, &(0x7f00000005c0)={@mcast1, 0x0, 0x2}, &(0x7f0000000600)=0x20)