2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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9 * notice, this list of conditions and the following disclaimer.
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13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
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18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
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33 * @(#)ip.h 8.2 (Berkeley) 6/1/94
34 * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $
35 * $DragonFly: src/sys/netinet/ip.h,v 1.2 2003/06/17 04:28:51 dillon Exp $
38 #ifndef _NETINET_IP_H_
39 #define _NETINET_IP_H_
42 * Definitions for internet protocol version 4.
43 * Per RFC 791, September 1981.
48 * Structure of an internet header, naked of options.
52 u_char ip_vhl; /* version << 4 | header length >> 2 */
54 #if BYTE_ORDER == LITTLE_ENDIAN
55 u_int ip_hl:4, /* header length */
58 #if BYTE_ORDER == BIG_ENDIAN
59 u_int ip_v:4, /* version */
60 ip_hl:4; /* header length */
62 #endif /* not _IP_VHL */
63 u_char ip_tos; /* type of service */
64 u_short ip_len; /* total length */
65 u_short ip_id; /* identification */
66 u_short ip_off; /* fragment offset field */
67 #define IP_RF 0x8000 /* reserved fragment flag */
68 #define IP_DF 0x4000 /* dont fragment flag */
69 #define IP_MF 0x2000 /* more fragments flag */
70 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
71 u_char ip_ttl; /* time to live */
72 u_char ip_p; /* protocol */
73 u_short ip_sum; /* checksum */
74 struct in_addr ip_src,ip_dst; /* source and dest address */
78 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl))
79 #define IP_VHL_HL(vhl) ((vhl) & 0x0f)
80 #define IP_VHL_V(vhl) ((vhl) >> 4)
81 #define IP_VHL_BORING 0x45
84 #define IP_MAXPACKET 65535 /* maximum packet size */
87 * Definitions for IP type of service (ip_tos)
89 #define IPTOS_LOWDELAY 0x10
90 #define IPTOS_THROUGHPUT 0x08
91 #define IPTOS_RELIABILITY 0x04
92 #define IPTOS_MINCOST 0x02
93 /* ECN bits proposed by Sally Floyd */
94 #define IPTOS_CE 0x01 /* congestion experienced */
95 #define IPTOS_ECT 0x02 /* ECN-capable transport */
99 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
101 #define IPTOS_PREC_NETCONTROL 0xe0
102 #define IPTOS_PREC_INTERNETCONTROL 0xc0
103 #define IPTOS_PREC_CRITIC_ECP 0xa0
104 #define IPTOS_PREC_FLASHOVERRIDE 0x80
105 #define IPTOS_PREC_FLASH 0x60
106 #define IPTOS_PREC_IMMEDIATE 0x40
107 #define IPTOS_PREC_PRIORITY 0x20
108 #define IPTOS_PREC_ROUTINE 0x00
111 * Definitions for options.
113 #define IPOPT_COPIED(o) ((o)&0x80)
114 #define IPOPT_CLASS(o) ((o)&0x60)
115 #define IPOPT_NUMBER(o) ((o)&0x1f)
117 #define IPOPT_CONTROL 0x00
118 #define IPOPT_RESERVED1 0x20
119 #define IPOPT_DEBMEAS 0x40
120 #define IPOPT_RESERVED2 0x60
122 #define IPOPT_EOL 0 /* end of option list */
123 #define IPOPT_NOP 1 /* no operation */
125 #define IPOPT_RR 7 /* record packet route */
126 #define IPOPT_TS 68 /* timestamp */
127 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
128 #define IPOPT_LSRR 131 /* loose source route */
129 #define IPOPT_SATID 136 /* satnet id */
130 #define IPOPT_SSRR 137 /* strict source route */
131 #define IPOPT_RA 148 /* router alert */
134 * Offsets to fields in options other than EOL and NOP.
136 #define IPOPT_OPTVAL 0 /* option ID */
137 #define IPOPT_OLEN 1 /* option length */
138 #define IPOPT_OFFSET 2 /* offset within option */
139 #define IPOPT_MINOFF 4 /* min value of above */
142 * Time stamp option structure.
144 struct ip_timestamp {
145 u_char ipt_code; /* IPOPT_TS */
146 u_char ipt_len; /* size of structure (variable) */
147 u_char ipt_ptr; /* index of current entry */
148 #if BYTE_ORDER == LITTLE_ENDIAN
149 u_int ipt_flg:4, /* flags, see below */
150 ipt_oflw:4; /* overflow counter */
152 #if BYTE_ORDER == BIG_ENDIAN
153 u_int ipt_oflw:4, /* overflow counter */
154 ipt_flg:4; /* flags, see below */
156 union ipt_timestamp {
159 struct in_addr ipt_addr;
165 /* flag bits for ipt_flg */
166 #define IPOPT_TS_TSONLY 0 /* timestamps only */
167 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
168 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
170 /* bits for security (not byte swapped) */
171 #define IPOPT_SECUR_UNCLASS 0x0000
172 #define IPOPT_SECUR_CONFID 0xf135
173 #define IPOPT_SECUR_EFTO 0x789a
174 #define IPOPT_SECUR_MMMM 0xbc4d
175 #define IPOPT_SECUR_RESTR 0xaf13
176 #define IPOPT_SECUR_SECRET 0xd788
177 #define IPOPT_SECUR_TOPSECRET 0x6bc5
180 * Internet implementation parameters.
182 #define MAXTTL 255 /* maximum time to live (seconds) */
183 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
184 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
185 #define IPTTLDEC 1 /* subtracted when forwarding */
187 #define IP_MSS 576 /* default maximum segment size */