1: /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */
2:
3: /*
4: * Copyright (c) 1982, 1986, 1993
5: * The Regents of the University of California. All rights reserved.
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: *
35: * @(#)ip.h 8.1 (Berkeley) 6/10/93
36: */
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: * We declare ip_len and ip_off to be short, rather than u_short
48: * pragmatically since otherwise unsigned comparisons can result
49: * against negative integers quite easily, and fail in subtle ways.
50: */
51: struct ip {
52: u_int8_t ip_fvhl; /* header length, version */
53: u_int8_t ip_tos; /* type of service */
54: int16_t ip_len; /* total length */
55: u_int16_t ip_id; /* identification */
56: int16_t ip_off; /* fragment offset field */
57: #define IP_DF 0x4000 /* dont fragment flag */
58: #define IP_MF 0x2000 /* more fragments flag */
59: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
60: u_int8_t ip_ttl; /* time to live */
61: u_int8_t ip_p; /* protocol */
62: u_int16_t ip_sum; /* checksum */
63: struct in_addr ip_src, ip_dst; /* source and dest address */
64: };
65:
66: #define IP_V(iph) ((iph)->ip_fvhl >> 4)
67: #define IP_HL(iph) (((iph)->ip_fvhl & 0x0F) << 2)
68: #define IP_V_SET(iph,x) ((iph)->ip_fvhl = ((iph)->ip_fvhl & 0x0F) | ((x) << 4))
69: #define IP_HL_SET(iph,x) ((iph)->ip_fvhl = \
70: ((iph)->ip_fvhl & 0xF0) | (((x) >> 2) & 0x0F))
71:
72: #define IP_MAXPACKET 65535 /* maximum packet size */
73:
74: /*
75: * Definitions for IP type of service (ip_tos)
76: */
77: #define IPTOS_LOWDELAY 0x10
78: #define IPTOS_THROUGHPUT 0x08
79: #define IPTOS_RELIABILITY 0x04
80: /* IPTOS_LOWCOST 0x02 XXX */
81:
82: /*
83: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
84: */
85: #define IPTOS_PREC_NETCONTROL 0xe0
86: #define IPTOS_PREC_INTERNETCONTROL 0xc0
87: #define IPTOS_PREC_CRITIC_ECP 0xa0
88: #define IPTOS_PREC_FLASHOVERRIDE 0x80
89: #define IPTOS_PREC_FLASH 0x60
90: #define IPTOS_PREC_IMMEDIATE 0x40
91: #define IPTOS_PREC_PRIORITY 0x20
92: #define IPTOS_PREC_ROUTINE 0x00
93:
94: /*
95: * Definitions for options.
96: */
97: #define IPOPT_COPIED(o) ((o)&0x80)
98: #define IPOPT_CLASS(o) ((o)&0x60)
99: #define IPOPT_NUMBER(o) ((o)&0x1f)
100:
101: #define IPOPT_CONTROL 0x00
102: #define IPOPT_RESERVED1 0x20
103: #define IPOPT_DEBMEAS 0x40
104: #define IPOPT_RESERVED2 0x60
105:
106: #define IPOPT_EOL 0 /* end of option list */
107: #define IPOPT_NOP 1 /* no operation */
108:
109: #define IPOPT_RR 7 /* record packet route */
110: #define IPOPT_TS 68 /* timestamp */
111: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
112: #define IPOPT_LSRR 131 /* loose source route */
113: #define IPOPT_SATID 136 /* satnet id */
114: #define IPOPT_SSRR 137 /* strict source route */
115:
116: /*
117: * Offsets to fields in options other than EOL and NOP.
118: */
119: #define IPOPT_OPTVAL 0 /* option ID */
120: #define IPOPT_OLEN 1 /* option length */
121: #define IPOPT_OFFSET 2 /* offset within option */
122: #define IPOPT_MINOFF 4 /* min value of above */
123:
124: /*
125: * Time stamp option structure.
126: */
127: struct ip_timestamp {
128: u_int8_t ipt_code; /* IPOPT_TS */
129: u_int8_t ipt_len; /* size of structure (variable) */
130: u_int8_t ipt_ptr; /* index of current entry */
131: u_int8_t ipt_flg_oflw; /* flags, see below, overflow counter */
132: union ipt_timestamp {
133: u_int32_t ipt_time[1];
134: struct ipt_ta {
135: struct in_addr ipt_addr;
136: u_int32_t ipt_time;
137: } ipt_ta[1];
138: } ipt_timestamp;
139: };
140:
141: /* flag bits for ipt_flg */
142: #define IPOPT_TS_TSONLY 0 /* timestamps only */
143: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
144: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
145:
146: /* bits for security (not byte swapped) */
147: #define IPOPT_SECUR_UNCLASS 0x0000
148: #define IPOPT_SECUR_CONFID 0xf135
149: #define IPOPT_SECUR_EFTO 0x789a
150: #define IPOPT_SECUR_MMMM 0xbc4d
151: #define IPOPT_SECUR_RESTR 0xaf13
152: #define IPOPT_SECUR_SECRET 0xd788
153: #define IPOPT_SECUR_TOPSECRET 0x6bc5
154:
155: /*
156: * Internet implementation parameters.
157: */
158: #define MAXTTL 255 /* maximum time to live (seconds) */
159: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
160: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
161: #define IPTTLDEC 1 /* subtracted when forwarding */
162:
163: #define IP_MSS 576 /* default maximum segment size */
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