<dec f='src/src/sys/net/if.h' l='1043' type='int if_nulltransmit(struct ifnet * , struct mbuf * )'/>
<def f='src/src/sys/net/if.c' l='369' ll='374' type='int if_nulltransmit(struct ifnet * ifp, struct mbuf * m)'/>
<use f='src/src/sys/net/if.c' l='733' u='r' c='if_register'/>
<use f='src/src/sys/net/if.c' l='1041' u='r' c='if_deactivate'/>
