1*16051Skarels /* ip.h 6.2 84/02/15 */ 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 { 179991Ssam #ifdef vax 184571Swnj u_char ip_hl:4, /* header length */ 194571Swnj ip_v:4; /* version */ 209991Ssam #endif 214571Swnj u_char ip_tos; /* type of service */ 224647Swnj short ip_len; /* total length */ 234571Swnj u_short ip_id; /* identification */ 244647Swnj short ip_off; /* fragment offset field */ 254662Swnj #define IP_DF 0x4000 /* dont fragment flag */ 264662Swnj #define IP_MF 0x2000 /* more fragments flag */ 274571Swnj u_char ip_ttl; /* time to live */ 284571Swnj u_char ip_p; /* protocol */ 294571Swnj u_short ip_sum; /* checksum */ 304923Swnj struct in_addr ip_src,ip_dst; /* source and dest address */ 314498Swnj }; 324498Swnj 334571Swnj /* 344662Swnj * Definitions for options. 354571Swnj */ 364662Swnj #define IPOPT_COPIED(o) ((o)&0x80) 37*16051Skarels #define IPOPT_CLASS(o) ((o)&0x60) 38*16051Skarels #define IPOPT_NUMBER(o) ((o)&0x1f) 394662Swnj 404662Swnj #define IPOPT_CONTROL 0x00 41*16051Skarels #define IPOPT_RESERVED1 0x20 42*16051Skarels #define IPOPT_DEBMEAS 0x40 43*16051Skarels #define IPOPT_RESERVED2 0x60 444662Swnj 454662Swnj #define IPOPT_EOL 0 /* end of option list */ 464662Swnj #define IPOPT_NOP 1 /* no operation */ 474662Swnj 484662Swnj #define IPOPT_RR 7 /* record packet route */ 494662Swnj #define IPOPT_TS 68 /* timestamp */ 504662Swnj #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 514662Swnj #define IPOPT_LSRR 131 /* loose source route */ 524662Swnj #define IPOPT_SATID 136 /* satnet id */ 534662Swnj #define IPOPT_SSRR 137 /* strict source route */ 544662Swnj 554662Swnj /* 564662Swnj * Time stamp option structure. 574662Swnj */ 584662Swnj struct ip_timestamp { 594662Swnj u_char ipt_code; /* IPOPT_TS */ 604662Swnj u_char ipt_len; /* size of structure (variable) */ 614662Swnj u_char ipt_ptr; /* index of current entry */ 624662Swnj u_char ipt_flg:4, /* flags, see below */ 634662Swnj ipt_oflw:4; /* overflow counter */ 644662Swnj union { 654662Swnj n_long ipt_time[1]; 664662Swnj struct ipt_ta { 674923Swnj struct in_addr ipt_addr; 684662Swnj n_long ipt_time; 694662Swnj } ipt_ta[1]; 704662Swnj } 714662Swnj }; 724662Swnj 734662Swnj /* flag bits for ipt_flg */ 744662Swnj #define IPOPT_TS_TSONLY 0 /* timestamps only */ 754662Swnj #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 764662Swnj #define IPOPT_TS_PRESPEC 2 /* specified modules only */ 774662Swnj 784662Swnj /* bits for security (not byte swapped) */ 794662Swnj #define IPOPT_SECUR_UNCLASS 0x0000 804662Swnj #define IPOPT_SECUR_CONFID 0xf135 814662Swnj #define IPOPT_SECUR_EFTO 0x789a 824662Swnj #define IPOPT_SECUR_MMMM 0xbc4d 834662Swnj #define IPOPT_SECUR_RESTR 0xaf13 844662Swnj #define IPOPT_SECUR_SECRET 0xd788 854662Swnj #define IPOPT_SECUR_TOPSECRET 0x6bc5 864662Swnj 874662Swnj /* 884662Swnj * Internet implementation parameters. 894662Swnj */ 904571Swnj #define MAXTTL 255 /* maximum time to live (seconds) */ 914662Swnj #define IPFRAGTTL 15 /* time to live for frag chains */ 926367Ssam #define IPTTLDEC 5 /* subtracted when forwarding */ 93