Macros starting with `i' in src/slirp

• ICMP_ADVLEN src/slirp/ip_icmp.h:113
• ICMP_INFOTYPE src/slirp/ip_icmp.h:157
• ifs_init src/slirp/if.c:21
• IPOPT_CLASS src/slirp/ip.h:117
• IPOPT_COPIED src/slirp/ip.h:116
• IPOPT_NUMBER src/slirp/ip.h:118
• iptofrag src/slirp/ip_input.c:240
• IS_EAGAIN src/slirp/socket.c:18