Defined in 2 files as a macro:

• bsd/net/if.h, line 339 (as a macro)
• bsd/net/if_private.h, line 293 (as a macro)

Referenced in 3 files:

• bsd/net/if.c, line 903
• bsd/net/necp.c, line 7635
• bsd/net/ntstat.c, line 962