Where tcp_timer_rexmt() is called?

[Lei Luo]

Hello,

Does anyone know where the TCP retransmission function tcp_timer_rexmt() 
is called? In other words, where is the code that checks if a timer is 
timed out? In BSD4.3, there is a function called tcp_timers() in 
tcp_timer.c. But in the recent release, the function is removed. But 
where the functionality is placed now?

Thanks,

Louis