Annotation of src/sys/netinet/ip.h, Revision 1.19
1.19 ! itojun 1: /* $NetBSD: ip.h,v 1.18 1998/02/10 01:26:44 perry Exp $ */
1.6 cgd 2:
1.1 cgd 3: /*
1.5 mycroft 4: * Copyright (c) 1982, 1986, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed by the University of
18: * California, Berkeley and its contributors.
19: * 4. Neither the name of the University nor the names of its contributors
20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: *
1.17 thorpej 35: * @(#)ip.h 8.2 (Berkeley) 6/1/94
1.1 cgd 36: */
37:
1.18 perry 38: #ifndef _NETINET_IP_H_
39: #define _NETINET_IP_H_
40:
1.1 cgd 41: /*
42: * Definitions for internet protocol version 4.
43: * Per RFC 791, September 1981.
44: */
45: #define IPVERSION 4
46:
47: /*
48: * Structure of an internet header, naked of options.
49: */
50: struct ip {
1.4 mycroft 51: #if BYTE_ORDER == LITTLE_ENDIAN
1.7 cgd 52: u_int8_t ip_hl:4, /* header length */
53: ip_v:4; /* version */
1.1 cgd 54: #endif
1.4 mycroft 55: #if BYTE_ORDER == BIG_ENDIAN
1.7 cgd 56: u_int8_t ip_v:4, /* version */
57: ip_hl:4; /* header length */
1.1 cgd 58: #endif
1.7 cgd 59: u_int8_t ip_tos; /* type of service */
1.15 thorpej 60: u_int16_t ip_len; /* total length */
1.7 cgd 61: u_int16_t ip_id; /* identification */
1.15 thorpej 62: u_int16_t ip_off; /* fragment offset field */
1.16 mycroft 63: #define IP_RF 0x8000 /* reserved fragment flag */
1.1 cgd 64: #define IP_DF 0x4000 /* dont fragment flag */
65: #define IP_MF 0x2000 /* more fragments flag */
1.5 mycroft 66: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
1.7 cgd 67: u_int8_t ip_ttl; /* time to live */
68: u_int8_t ip_p; /* protocol */
69: u_int16_t ip_sum; /* checksum */
1.8 cgd 70: struct in_addr ip_src, ip_dst; /* source and dest address */
1.1 cgd 71: };
72:
73: #define IP_MAXPACKET 65535 /* maximum packet size */
74:
75: /*
76: * Definitions for IP type of service (ip_tos)
77: */
78: #define IPTOS_LOWDELAY 0x10
79: #define IPTOS_THROUGHPUT 0x08
80: #define IPTOS_RELIABILITY 0x04
1.9 cgd 81: /* IPTOS_LOWCOST 0x02 XXX */
1.19 ! itojun 82: #if 1
! 83: /* ECN bits proposed by Sally Floyd */
! 84: #define IPTOS_CE 0x01 /* congestion experienced */
! 85: #define IPTOS_ECT 0x02 /* ECN-capable transport */
! 86: #endif
1.1 cgd 87:
88: /*
89: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
90: */
91: #define IPTOS_PREC_NETCONTROL 0xe0
92: #define IPTOS_PREC_INTERNETCONTROL 0xc0
93: #define IPTOS_PREC_CRITIC_ECP 0xa0
94: #define IPTOS_PREC_FLASHOVERRIDE 0x80
95: #define IPTOS_PREC_FLASH 0x60
96: #define IPTOS_PREC_IMMEDIATE 0x40
97: #define IPTOS_PREC_PRIORITY 0x20
1.9 cgd 98: #define IPTOS_PREC_ROUTINE 0x00
1.1 cgd 99:
100: /*
101: * Definitions for options.
102: */
103: #define IPOPT_COPIED(o) ((o)&0x80)
104: #define IPOPT_CLASS(o) ((o)&0x60)
105: #define IPOPT_NUMBER(o) ((o)&0x1f)
106:
107: #define IPOPT_CONTROL 0x00
108: #define IPOPT_RESERVED1 0x20
109: #define IPOPT_DEBMEAS 0x40
110: #define IPOPT_RESERVED2 0x60
111:
112: #define IPOPT_EOL 0 /* end of option list */
113: #define IPOPT_NOP 1 /* no operation */
114:
115: #define IPOPT_RR 7 /* record packet route */
116: #define IPOPT_TS 68 /* timestamp */
117: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
118: #define IPOPT_LSRR 131 /* loose source route */
119: #define IPOPT_SATID 136 /* satnet id */
120: #define IPOPT_SSRR 137 /* strict source route */
121:
122: /*
123: * Offsets to fields in options other than EOL and NOP.
124: */
125: #define IPOPT_OPTVAL 0 /* option ID */
126: #define IPOPT_OLEN 1 /* option length */
1.4 mycroft 127: #define IPOPT_OFFSET 2 /* offset within option */
1.1 cgd 128: #define IPOPT_MINOFF 4 /* min value of above */
129:
130: /*
131: * Time stamp option structure.
132: */
133: struct ip_timestamp {
1.7 cgd 134: u_int8_t ipt_code; /* IPOPT_TS */
135: u_int8_t ipt_len; /* size of structure (variable) */
136: u_int8_t ipt_ptr; /* index of current entry */
1.4 mycroft 137: #if BYTE_ORDER == LITTLE_ENDIAN
1.7 cgd 138: u_int8_t ipt_flg:4, /* flags, see below */
139: ipt_oflw:4; /* overflow counter */
1.1 cgd 140: #endif
1.4 mycroft 141: #if BYTE_ORDER == BIG_ENDIAN
1.7 cgd 142: u_int8_t ipt_oflw:4, /* overflow counter */
143: ipt_flg:4; /* flags, see below */
1.1 cgd 144: #endif
145: union ipt_timestamp {
1.8 cgd 146: n_time ipt_time[1];
147: struct ipt_ta {
1.1 cgd 148: struct in_addr ipt_addr;
1.7 cgd 149: n_time ipt_time;
1.8 cgd 150: } ipt_ta[1];
1.1 cgd 151: } ipt_timestamp;
152: };
153:
154: /* flag bits for ipt_flg */
155: #define IPOPT_TS_TSONLY 0 /* timestamps only */
156: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
157: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
158:
159: /* bits for security (not byte swapped) */
160: #define IPOPT_SECUR_UNCLASS 0x0000
161: #define IPOPT_SECUR_CONFID 0xf135
162: #define IPOPT_SECUR_EFTO 0x789a
163: #define IPOPT_SECUR_MMMM 0xbc4d
164: #define IPOPT_SECUR_RESTR 0xaf13
165: #define IPOPT_SECUR_SECRET 0xd788
166: #define IPOPT_SECUR_TOPSECRET 0x6bc5
167:
168: /*
169: * Internet implementation parameters.
170: */
171: #define MAXTTL 255 /* maximum time to live (seconds) */
1.5 mycroft 172: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
1.1 cgd 173: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
174: #define IPTTLDEC 1 /* subtracted when forwarding */
175:
176: #define IP_MSS 576 /* default maximum segment size */
1.18 perry 177:
178: #endif /* _NETINET_IP_H_ */
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