1*9991Ssam /* ip.h 1.11 82/12/28 */ 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 { 17*9991Ssam #ifdef vax 184571Swnj u_char ip_hl:4, /* header length */ 194571Swnj ip_v:4; /* version */ 20*9991Ssam #endif 21*9991Ssam #ifdef sun 22*9991Ssam u_char ip_v:4, /* version */ 23*9991Ssam ip_hl:4; /* header length */ 24*9991Ssam #endif 254571Swnj u_char ip_tos; /* type of service */ 264647Swnj short ip_len; /* total length */ 274571Swnj u_short ip_id; /* identification */ 284647Swnj short ip_off; /* fragment offset field */ 294662Swnj #define IP_DF 0x4000 /* dont fragment flag */ 304662Swnj #define IP_MF 0x2000 /* more fragments flag */ 314571Swnj u_char ip_ttl; /* time to live */ 324571Swnj u_char ip_p; /* protocol */ 334571Swnj u_short ip_sum; /* checksum */ 344923Swnj struct in_addr ip_src,ip_dst; /* source and dest address */ 354498Swnj }; 364498Swnj 374571Swnj /* 384662Swnj * Definitions for options. 394571Swnj */ 404662Swnj #define IPOPT_COPIED(o) ((o)&0x80) 414662Swnj #define IPOPT_CLASS(o) ((o)&0x40) 424662Swnj #define IPOPT_NUMBER(o) ((o)&0x3f) 434662Swnj 444662Swnj #define IPOPT_CONTROL 0x00 454662Swnj #define IPOPT_RESERVED1 0x10 464662Swnj #define IPOPT_DEBMEAS 0x20 474662Swnj #define IPOPT_RESERVED2 0x30 484662Swnj 494662Swnj #define IPOPT_EOL 0 /* end of option list */ 504662Swnj #define IPOPT_NOP 1 /* no operation */ 514662Swnj 524662Swnj #define IPOPT_RR 7 /* record packet route */ 534662Swnj #define IPOPT_TS 68 /* timestamp */ 544662Swnj #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ 554662Swnj #define IPOPT_LSRR 131 /* loose source route */ 564662Swnj #define IPOPT_SATID 136 /* satnet id */ 574662Swnj #define IPOPT_SSRR 137 /* strict source route */ 584662Swnj 594662Swnj /* 604662Swnj * Time stamp option structure. 614662Swnj */ 624662Swnj struct ip_timestamp { 634662Swnj u_char ipt_code; /* IPOPT_TS */ 644662Swnj u_char ipt_len; /* size of structure (variable) */ 654662Swnj u_char ipt_ptr; /* index of current entry */ 664662Swnj u_char ipt_flg:4, /* flags, see below */ 674662Swnj ipt_oflw:4; /* overflow counter */ 684662Swnj union { 694662Swnj n_long ipt_time[1]; 704662Swnj struct ipt_ta { 714923Swnj struct in_addr ipt_addr; 724662Swnj n_long ipt_time; 734662Swnj } ipt_ta[1]; 744662Swnj } 754662Swnj }; 764662Swnj 774662Swnj /* flag bits for ipt_flg */ 784662Swnj #define IPOPT_TS_TSONLY 0 /* timestamps only */ 794662Swnj #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ 804662Swnj #define IPOPT_TS_PRESPEC 2 /* specified modules only */ 814662Swnj 824662Swnj /* bits for security (not byte swapped) */ 834662Swnj #define IPOPT_SECUR_UNCLASS 0x0000 844662Swnj #define IPOPT_SECUR_CONFID 0xf135 854662Swnj #define IPOPT_SECUR_EFTO 0x789a 864662Swnj #define IPOPT_SECUR_MMMM 0xbc4d 874662Swnj #define IPOPT_SECUR_RESTR 0xaf13 884662Swnj #define IPOPT_SECUR_SECRET 0xd788 894662Swnj #define IPOPT_SECUR_TOPSECRET 0x6bc5 904662Swnj 914662Swnj /* 924662Swnj * Internet implementation parameters. 934662Swnj */ 944571Swnj #define MAXTTL 255 /* maximum time to live (seconds) */ 954662Swnj #define IPFRAGTTL 15 /* time to live for frag chains */ 966367Ssam #define IPTTLDEC 5 /* subtracted when forwarding */ 97