1*4923Swnj /* ip.h 1.9 81/11/18 */ 24571Swnj 34662Swnj /* 44662Swnj * Definitions for internet protocol version 4. 54662Swnj * Per RFC 791, September 1981. 64662Swnj */ 74662Swnj #define IPVERSION 4 84662Swnj 94662Swnj /* 104662Swnj * Structure of an internet header, naked of options. 114662Swnj * 124884Swnj * We declare ip_len and ip_off to be short, rather than u_short 134884Swnj * pragmatically since otherwise unsigned comparisons can result 144884Swnj * against negative integers quite easily, and fail in subtle ways. 154662Swnj */ 164571Swnj struct ip { 174571Swnj u_char ip_hl:4, /* header length */ 184571Swnj ip_v:4; /* version */ 194571Swnj u_char ip_tos; /* type of service */ 204647Swnj short ip_len; /* total length */ 214571Swnj u_short ip_id; /* identification */ 224647Swnj short ip_off; /* fragment offset field */ 234662Swnj #define IP_DF 0x4000 /* dont fragment flag */ 244662Swnj #define IP_MF 0x2000 /* more fragments flag */ 254571Swnj u_char ip_ttl; /* time to live */ 264571Swnj u_char ip_p; /* protocol */ 274571Swnj u_short ip_sum; /* checksum */ 28*4923Swnj struct in_addr ip_src,ip_dst; /* source and dest address */ 294498Swnj }; 304498Swnj 314571Swnj /* 324662Swnj * Definitions for options. 334571Swnj */ 344662Swnj #define IPOPT_COPIED(o) ((o)&0x80) 354662Swnj #define IPOPT_CLASS(o) ((o)&0x40) 364662Swnj #define IPOPT_NUMBER(o) ((o)&0x3f) 374662Swnj 384662Swnj #define IPOPT_CONTROL 0x00 394662Swnj #define IPOPT_RESERVED1 0x10 404662Swnj #define IPOPT_DEBMEAS 0x20 414662Swnj #define IPOPT_RESERVED2 0x30 424662Swnj 434662Swnj #define IPOPT_EOL 0 /* end of option list */ 444662Swnj #define IPOPT_NOP 1 /* no operation */ 454662Swnj 464662Swnj #define IPOPT_RR 7 /* record packet route */ 474662Swnj #define IPOPT_TS 68 /* timestamp */ 484662Swnj #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 494662Swnj #define IPOPT_LSRR 131 /* loose source route */ 504662Swnj #define IPOPT_SATID 136 /* satnet id */ 514662Swnj #define IPOPT_SSRR 137 /* strict source route */ 524662Swnj 534662Swnj /* 544662Swnj * Time stamp option structure. 554662Swnj */ 564662Swnj struct ip_timestamp { 574662Swnj u_char ipt_code; /* IPOPT_TS */ 584662Swnj u_char ipt_len; /* size of structure (variable) */ 594662Swnj u_char ipt_ptr; /* index of current entry */ 604662Swnj u_char ipt_flg:4, /* flags, see below */ 614662Swnj ipt_oflw:4; /* overflow counter */ 624662Swnj union { 634662Swnj n_long ipt_time[1]; 644662Swnj struct ipt_ta { 65*4923Swnj struct in_addr ipt_addr; 664662Swnj n_long ipt_time; 674662Swnj } ipt_ta[1]; 684662Swnj } 694662Swnj }; 704662Swnj 714662Swnj /* flag bits for ipt_flg */ 724662Swnj #define IPOPT_TS_TSONLY 0 /* timestamps only */ 734662Swnj #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 744662Swnj #define IPOPT_TS_PRESPEC 2 /* specified modules only */ 754662Swnj 764662Swnj /* bits for security (not byte swapped) */ 774662Swnj #define IPOPT_SECUR_UNCLASS 0x0000 784662Swnj #define IPOPT_SECUR_CONFID 0xf135 794662Swnj #define IPOPT_SECUR_EFTO 0x789a 804662Swnj #define IPOPT_SECUR_MMMM 0xbc4d 814662Swnj #define IPOPT_SECUR_RESTR 0xaf13 824662Swnj #define IPOPT_SECUR_SECRET 0xd788 834662Swnj #define IPOPT_SECUR_TOPSECRET 0x6bc5 844662Swnj 854662Swnj /* 864662Swnj * Internet implementation parameters. 874662Swnj */ 884571Swnj #define MAXTTL 255 /* maximum time to live (seconds) */ 894662Swnj #define IPFRAGTTL 15 /* time to live for frag chains */ 90