r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
ioctl$sock_SIOCDELRT(r0, 0x890c, &(0x7f0000000dc0)={0x0, @l2={0x1f, 0x0, @fixed}, @l2tp={0x2, 0x0, @multicast1}, @nl=@proc})