Annotation of sys/netinet/ip.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: ip.h,v 1.12 2006/04/27 02:19:32 tedu Exp $ */
! 2: /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1982, 1986, 1993
! 6: * The Regents of the University of California. All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: *
! 32: * @(#)ip.h 8.1 (Berkeley) 6/10/93
! 33: */
! 34:
! 35: #ifndef _NETINET_IP_H_
! 36: #define _NETINET_IP_H_
! 37:
! 38: /*
! 39: * Definitions for internet protocol version 4.
! 40: * Per RFC 791, September 1981.
! 41: */
! 42: #define IPVERSION 4
! 43:
! 44: /*
! 45: * Structure of an internet header, naked of options.
! 46: */
! 47: struct ip {
! 48: #if _BYTE_ORDER == _LITTLE_ENDIAN
! 49: u_int ip_hl:4, /* header length */
! 50: ip_v:4; /* version */
! 51: #endif
! 52: #if _BYTE_ORDER == _BIG_ENDIAN
! 53: u_int ip_v:4, /* version */
! 54: ip_hl:4; /* header length */
! 55: #endif
! 56: u_int8_t ip_tos; /* type of service */
! 57: u_int16_t ip_len; /* total length */
! 58: u_int16_t ip_id; /* identification */
! 59: u_int16_t ip_off; /* fragment offset field */
! 60: #define IP_RF 0x8000 /* reserved fragment flag */
! 61: #define IP_DF 0x4000 /* dont fragment flag */
! 62: #define IP_MF 0x2000 /* more fragments flag */
! 63: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
! 64: u_int8_t ip_ttl; /* time to live */
! 65: u_int8_t ip_p; /* protocol */
! 66: u_int16_t ip_sum; /* checksum */
! 67: struct in_addr ip_src, ip_dst; /* source and dest address */
! 68: };
! 69:
! 70: #define IP_MAXPACKET 65535 /* maximum packet size */
! 71:
! 72: /*
! 73: * Definitions for IP type of service (ip_tos)
! 74: */
! 75: #define IPTOS_LOWDELAY 0x10
! 76: #define IPTOS_THROUGHPUT 0x08
! 77: #define IPTOS_RELIABILITY 0x04
! 78: /* IPTOS_LOWCOST 0x02 XXX */
! 79: #if 1
! 80: /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
! 81: #define IPTOS_CE 0x01 /* congestion experienced */
! 82: #define IPTOS_ECT 0x02 /* ECN-capable transport */
! 83: #endif
! 84:
! 85: /*
! 86: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
! 87: */
! 88: #define IPTOS_PREC_NETCONTROL 0xe0
! 89: #define IPTOS_PREC_INTERNETCONTROL 0xc0
! 90: #define IPTOS_PREC_CRITIC_ECP 0xa0
! 91: #define IPTOS_PREC_FLASHOVERRIDE 0x80
! 92: #define IPTOS_PREC_FLASH 0x60
! 93: #define IPTOS_PREC_IMMEDIATE 0x40
! 94: #define IPTOS_PREC_PRIORITY 0x20
! 95: #define IPTOS_PREC_ROUTINE 0x00
! 96:
! 97: /*
! 98: * ECN (Explicit Congestion Notification) codepoints in RFC3168
! 99: * mapped to the lower 2 bits of the TOS field.
! 100: */
! 101: #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
! 102: #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
! 103: #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
! 104: #define IPTOS_ECN_CE 0x03 /* congestion experienced */
! 105: #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
! 106:
! 107: /*
! 108: * Definitions for options.
! 109: */
! 110: #define IPOPT_COPIED(o) ((o)&0x80)
! 111: #define IPOPT_CLASS(o) ((o)&0x60)
! 112: #define IPOPT_NUMBER(o) ((o)&0x1f)
! 113:
! 114: #define IPOPT_CONTROL 0x00
! 115: #define IPOPT_RESERVED1 0x20
! 116: #define IPOPT_DEBMEAS 0x40
! 117: #define IPOPT_RESERVED2 0x60
! 118:
! 119: #define IPOPT_EOL 0 /* end of option list */
! 120: #define IPOPT_NOP 1 /* no operation */
! 121:
! 122: #define IPOPT_RR 7 /* record packet route */
! 123: #define IPOPT_TS 68 /* timestamp */
! 124: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
! 125: #define IPOPT_LSRR 131 /* loose source route */
! 126: #define IPOPT_SATID 136 /* satnet id */
! 127: #define IPOPT_SSRR 137 /* strict source route */
! 128:
! 129: /*
! 130: * Offsets to fields in options other than EOL and NOP.
! 131: */
! 132: #define IPOPT_OPTVAL 0 /* option ID */
! 133: #define IPOPT_OLEN 1 /* option length */
! 134: #define IPOPT_OFFSET 2 /* offset within option */
! 135: #define IPOPT_MINOFF 4 /* min value of above */
! 136:
! 137: /*
! 138: * Time stamp option structure.
! 139: */
! 140: struct ip_timestamp {
! 141: u_int8_t ipt_code; /* IPOPT_TS */
! 142: u_int8_t ipt_len; /* size of structure (variable) */
! 143: u_int8_t ipt_ptr; /* index of current entry */
! 144: #if _BYTE_ORDER == _LITTLE_ENDIAN
! 145: u_int ipt_flg:4, /* flags, see below */
! 146: ipt_oflw:4; /* overflow counter */
! 147: #endif
! 148: #if _BYTE_ORDER == _BIG_ENDIAN
! 149: u_int ipt_oflw:4, /* overflow counter */
! 150: ipt_flg:4; /* flags, see below */
! 151: #endif
! 152: union ipt_timestamp {
! 153: n_time ipt_time[1];
! 154: struct ipt_ta {
! 155: struct in_addr ipt_addr;
! 156: n_time ipt_time;
! 157: } ipt_ta[1];
! 158: } ipt_timestamp;
! 159: };
! 160:
! 161: /* flag bits for ipt_flg */
! 162: #define IPOPT_TS_TSONLY 0 /* timestamps only */
! 163: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
! 164: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
! 165:
! 166: /* bits for security (not byte swapped) */
! 167: #define IPOPT_SECUR_UNCLASS 0x0000
! 168: #define IPOPT_SECUR_CONFID 0xf135
! 169: #define IPOPT_SECUR_EFTO 0x789a
! 170: #define IPOPT_SECUR_MMMM 0xbc4d
! 171: #define IPOPT_SECUR_RESTR 0xaf13
! 172: #define IPOPT_SECUR_SECRET 0xd788
! 173: #define IPOPT_SECUR_TOPSECRET 0x6bc5
! 174:
! 175: /*
! 176: * Internet implementation parameters.
! 177: */
! 178: #define MAXTTL 255 /* maximum time to live (seconds) */
! 179: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
! 180: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
! 181: #define IPTTLDEC 1 /* subtracted when forwarding */
! 182:
! 183: #define IP_MSS 576 /* default maximum segment size */
! 184:
! 185: /*
! 186: * This is the real IPv4 pseudo header, used for computing the TCP and UDP
! 187: * checksums. For the Internet checksum, struct ipovly can be used instead.
! 188: * For stronger checksums, the real thing must be used.
! 189: */
! 190: struct ippseudo {
! 191: struct in_addr ippseudo_src; /* source internet address */
! 192: struct in_addr ippseudo_dst; /* destination internet address */
! 193: u_int8_t ippseudo_pad; /* pad, must be zero */
! 194: u_int8_t ippseudo_p; /* protocol */
! 195: u_int16_t ippseudo_len; /* protocol length */
! 196: };
! 197: #endif /* _NETINET_IP_H_ */
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