Defined in 2 files as a macro:

• bsd/net/if.h, line 344 (as a macro)
• bsd/net/if_private.h, line 298 (as a macro)

Referenced in 3 files:

• bsd/net/if.c, line 922
• bsd/net/necp_client.c, line 6274
• bsd/net/ntstat.c, line 966