r0 = socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_inet6_SIOCDELRT(r0, 0x890c, &(0x7f0000000640)={@local, @mcast2, @ipv4={'\x00', '\xff\xff', @local}, 0x0, 0x40, 0x0, 0x0, 0x0, 0x2100022})