aaf1597b1d
The root of problem is re-locking at the end of pfsync_sendout(). Several functions are calling pfsync_sendout() holding pointers to pf data on stack, and these functions expect this data to be consistent. To fix this, the following approach was taken: - The pfsync_sendout() doesn't call ip_output() directly, but enqueues the mbuf on sc->sc_ifp's interfaces queue, that is currently unused. Then pfsync netisr is scheduled. PF_LOCK isn't dropped in pfsync_sendout(). - The netisr runs through queue and ip_output()s packets on it. Apart from fixing race, this also decouples stack, fixing potential issues, that may happen, when sending pfsync(4) packets on input path. Reviewed by: eri (a quick review)
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