Defined in 2 files as a macro:

• contrib/tcpdump/ip.h, line 159 (as a macro)
• sys/netinet/ip.h, line 205 (as a macro)

Referenced in 6 files:

• contrib/netbsd-tests/net/icmp/t_ping.c, line 389
• stand/libsa/ip.c, line 117
• sys/contrib/ipfilter/netinet/ip_fil_freebsd.c, line 506
• sys/net/if_vxlan.c, line 2595
• sys/netinet/raw_ip.c, line 81
• tools/tools/netmap/pkt-gen.c, line 671