| 1 | /* ip.h 1.10 82/03/30 */ |
| 2 | |
| 3 | /* |
| 4 | * Definitions for internet protocol version 4. |
| 5 | * Per RFC 791, September 1981. |
| 6 | */ |
| 7 | #define IPVERSION 4 |
| 8 | |
| 9 | /* |
| 10 | * Structure of an internet header, naked of options. |
| 11 | * |
| 12 | * We declare ip_len and ip_off to be short, rather than u_short |
| 13 | * pragmatically since otherwise unsigned comparisons can result |
| 14 | * against negative integers quite easily, and fail in subtle ways. |
| 15 | */ |
| 16 | struct ip { |
| 17 | u_char ip_hl:4, /* header length */ |
| 18 | ip_v:4; /* version */ |
| 19 | u_char ip_tos; /* type of service */ |
| 20 | short ip_len; /* total length */ |
| 21 | u_short ip_id; /* identification */ |
| 22 | short ip_off; /* fragment offset field */ |
| 23 | #define IP_DF 0x4000 /* dont fragment flag */ |
| 24 | #define IP_MF 0x2000 /* more fragments flag */ |
| 25 | u_char ip_ttl; /* time to live */ |
| 26 | u_char ip_p; /* protocol */ |
| 27 | u_short ip_sum; /* checksum */ |
| 28 | struct in_addr ip_src,ip_dst; /* source and dest address */ |
| 29 | }; |
| 30 | |
| 31 | /* |
| 32 | * Definitions for options. |
| 33 | */ |
| 34 | #define IPOPT_COPIED(o) ((o)&0x80) |
| 35 | #define IPOPT_CLASS(o) ((o)&0x40) |
| 36 | #define IPOPT_NUMBER(o) ((o)&0x3f) |
| 37 | |
| 38 | #define IPOPT_CONTROL 0x00 |
| 39 | #define IPOPT_RESERVED1 0x10 |
| 40 | #define IPOPT_DEBMEAS 0x20 |
| 41 | #define IPOPT_RESERVED2 0x30 |
| 42 | |
| 43 | #define IPOPT_EOL 0 /* end of option list */ |
| 44 | #define IPOPT_NOP 1 /* no operation */ |
| 45 | |
| 46 | #define IPOPT_RR 7 /* record packet route */ |
| 47 | #define IPOPT_TS 68 /* timestamp */ |
| 48 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
| 49 | #define IPOPT_LSRR 131 /* loose source route */ |
| 50 | #define IPOPT_SATID 136 /* satnet id */ |
| 51 | #define IPOPT_SSRR 137 /* strict source route */ |
| 52 | |
| 53 | /* |
| 54 | * Time stamp option structure. |
| 55 | */ |
| 56 | struct ip_timestamp { |
| 57 | u_char ipt_code; /* IPOPT_TS */ |
| 58 | u_char ipt_len; /* size of structure (variable) */ |
| 59 | u_char ipt_ptr; /* index of current entry */ |
| 60 | u_char ipt_flg:4, /* flags, see below */ |
| 61 | ipt_oflw:4; /* overflow counter */ |
| 62 | union { |
| 63 | n_long ipt_time[1]; |
| 64 | struct ipt_ta { |
| 65 | struct in_addr ipt_addr; |
| 66 | n_long ipt_time; |
| 67 | } ipt_ta[1]; |
| 68 | } |
| 69 | }; |
| 70 | |
| 71 | /* flag bits for ipt_flg */ |
| 72 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ |
| 73 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ |
| 74 | #define IPOPT_TS_PRESPEC 2 /* specified modules only */ |
| 75 | |
| 76 | /* bits for security (not byte swapped) */ |
| 77 | #define IPOPT_SECUR_UNCLASS 0x0000 |
| 78 | #define IPOPT_SECUR_CONFID 0xf135 |
| 79 | #define IPOPT_SECUR_EFTO 0x789a |
| 80 | #define IPOPT_SECUR_MMMM 0xbc4d |
| 81 | #define IPOPT_SECUR_RESTR 0xaf13 |
| 82 | #define IPOPT_SECUR_SECRET 0xd788 |
| 83 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 |
| 84 | |
| 85 | /* |
| 86 | * Internet implementation parameters. |
| 87 | */ |
| 88 | #define MAXTTL 255 /* maximum time to live (seconds) */ |
| 89 | #define IPFRAGTTL 15 /* time to live for frag chains */ |
| 90 | #define IPTTLDEC 5 /* subtracted when forwarding */ |