full nelson?

Hey just looking for opinions/actual rules on full nelsons in jiu jitsu. i was rolling with a heavy weight today ( i only weigh 170) and he took my back and threw in a full nelson and rolled my forward onto my shoulders. I couldnt go anywhere but it didnt hurt and i didnt want it to so i just tapped. anyway just looking for some input.

i was actually wondering if full nelsons are legal in bjj just the other day because i know there a no no in wrestiling

I guess in any tournament that neck cranks are allowed, full nelsons would be okay. I've never seen one in action though.

its catch wreslting and wrestling grip
they use some stuff like that in jiu jitsu like a quarter nelson(i hope im not wrong lol)
for the vice grip for darce choke or japanese neck tie theres all kind of stuff its aweomse

Not allowed if neck cranks are not allowed.