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1.1 ! root 1: /* ! 2: * Copyright (c) 1982, 1986 Regents of the University of California. ! 3: * All rights reserved. The Berkeley software License Agreement ! 4: * specifies the terms and conditions for redistribution. ! 5: * ! 6: * @(#)ip.h 7.1 (Berkeley) 6/5/86 ! 7: */ ! 8: ! 9: /* ! 10: * Definitions for internet protocol version 4. ! 11: * Per RFC 791, September 1981. ! 12: */ ! 13: #define IPVERSION 4 ! 14: ! 15: /* ! 16: * Structure of an internet header, naked of options. ! 17: * ! 18: * We declare ip_len and ip_off to be short, rather than u_short ! 19: * pragmatically since otherwise unsigned comparisons can result ! 20: * against negative integers quite easily, and fail in subtle ways. ! 21: */ ! 22: struct ip { ! 23: #ifdef vax ! 24: u_char ip_hl:4, /* header length */ ! 25: ip_v:4; /* version */ ! 26: #endif ! 27: u_char ip_tos; /* type of service */ ! 28: short ip_len; /* total length */ ! 29: u_short ip_id; /* identification */ ! 30: short ip_off; /* fragment offset field */ ! 31: #define IP_DF 0x4000 /* dont fragment flag */ ! 32: #define IP_MF 0x2000 /* more fragments flag */ ! 33: u_char ip_ttl; /* time to live */ ! 34: u_char ip_p; /* protocol */ ! 35: u_short ip_sum; /* checksum */ ! 36: struct in_addr ip_src,ip_dst; /* source and dest address */ ! 37: }; ! 38: ! 39: /* ! 40: * Definitions for options. ! 41: */ ! 42: #define IPOPT_COPIED(o) ((o)&0x80) ! 43: #define IPOPT_CLASS(o) ((o)&0x60) ! 44: #define IPOPT_NUMBER(o) ((o)&0x1f) ! 45: ! 46: #define IPOPT_CONTROL 0x00 ! 47: #define IPOPT_RESERVED1 0x20 ! 48: #define IPOPT_DEBMEAS 0x40 ! 49: #define IPOPT_RESERVED2 0x60 ! 50: ! 51: #define IPOPT_EOL 0 /* end of option list */ ! 52: #define IPOPT_NOP 1 /* no operation */ ! 53: ! 54: #define IPOPT_RR 7 /* record packet route */ ! 55: #define IPOPT_TS 68 /* timestamp */ ! 56: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ ! 57: #define IPOPT_LSRR 131 /* loose source route */ ! 58: #define IPOPT_SATID 136 /* satnet id */ ! 59: #define IPOPT_SSRR 137 /* strict source route */ ! 60: ! 61: /* ! 62: * Offsets to fields in options other than EOL and NOP. ! 63: */ ! 64: #define IPOPT_OPTVAL 0 /* option ID */ ! 65: #define IPOPT_OLEN 1 /* option length */ ! 66: #define IPOPT_OFFSET 2 /* offset within option */ ! 67: #define IPOPT_MINOFF 4 /* min value of above */ ! 68: ! 69: /* ! 70: * Time stamp option structure. ! 71: */ ! 72: struct ip_timestamp { ! 73: u_char ipt_code; /* IPOPT_TS */ ! 74: u_char ipt_len; /* size of structure (variable) */ ! 75: u_char ipt_ptr; /* index of current entry */ ! 76: u_char ipt_flg:4, /* flags, see below */ ! 77: ipt_oflw:4; /* overflow counter */ ! 78: union { ! 79: n_long ipt_time[1]; ! 80: struct ipt_ta { ! 81: struct in_addr ipt_addr; ! 82: n_long ipt_time; ! 83: } ipt_ta[1]; ! 84: } ! 85: }; ! 86: ! 87: /* flag bits for ipt_flg */ ! 88: #define IPOPT_TS_TSONLY 0 /* timestamps only */ ! 89: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ ! 90: #define IPOPT_TS_PRESPEC 2 /* specified modules only */ ! 91: ! 92: /* bits for security (not byte swapped) */ ! 93: #define IPOPT_SECUR_UNCLASS 0x0000 ! 94: #define IPOPT_SECUR_CONFID 0xf135 ! 95: #define IPOPT_SECUR_EFTO 0x789a ! 96: #define IPOPT_SECUR_MMMM 0xbc4d ! 97: #define IPOPT_SECUR_RESTR 0xaf13 ! 98: #define IPOPT_SECUR_SECRET 0xd788 ! 99: #define IPOPT_SECUR_TOPSECRET 0x6bc5 ! 100: ! 101: /* ! 102: * Internet implementation parameters. ! 103: */ ! 104: #define MAXTTL 255 /* maximum time to live (seconds) */ ! 105: #define IPFRAGTTL 15 /* time to live for frag chains */ ! 106: #define IPTTLDEC 1 /* subtracted when forwarding */ ! 107: ! 108: #define IP_MSS 576 /* default maximum segment size */
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