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IOCTL help

How do we get from ioctl(fd, SIOCFRENB, 0); in sbin/ipf.c to
IPL_EXTERN(ioctl)(dev, cmd, data, mode, ....) in sys/netinet/ip_fil.c?

Specifically who/what/where calls this routine and sets the mode parameter?
See there exists code in IPL_EXTERN(ioctl) such that if mode != FWRITE, to
return EPERM. Assuming the mechanism works, we (OpenBSD) can purhaps
dispense with the body of code that says "if securelevel > 1 return EPERM".

Am I making any sense?

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 Matthew Patton, 1LT USAF	Webmaster, Resource Analysis
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