<dec f='src/src/sys/net/if.h' l='364'/>
<use f='src/src/sys/net/if_ppp.c' l='1729' u='c'/>
<use f='src/src/sys/net/if_ppp.c' l='1747' u='c'/>
<use f='src/src/sys/net/if_sl.c' l='968' u='c'/>
<use f='src/src/sys/net/if_spppsubr.c' l='501' u='c'/>
