According to the government.

Independent on the eve of the war after Putin proclaiming the Special Military Operation:

Approximately 69% of Russians now approve of Putin, compared to the 61% who approved of him in August 2021, according to Russian polling agency the Levada Center. And 29% of Russians disapprove of Putin, down from 37% in August 2021.

This is similar in Ukraine where most people rallied around the government, and actually typical for an European country at war in early stages.

The outbreak of WWI was met with mass enthusiasm in every involved country, including entire high school classes all volunteering, and "anti-war" socialists also voting for war. 2 years later and the French were shooting their own soldiers to break mutinies, then fast forward some more and the Russian, Austro-Hungarian, German empires were all taken down by socialist revolutions, nationalist uprisings, and military coups where not only the citizens' but crucially the soldiers/sailors' demands were to just stop the war. (And the war in Russia then didn't stop with even the end of WWI, and somehow got even worse.)

It's very different in Western Europe now, when for example the London march against the war in Iraq (before it started) was the greatest in all British history. But Russia is old style, and the state monopoly on very crude and omnipresent propaganda (and penalization of dissent) obviously helps a lot. Then the little things like the private loot going home also help. As I said,old style.