2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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33 * @(#)ip.h 8.2 (Berkeley) 6/1/94
37 #ifndef _NETINET_IP_H_
38 #define _NETINET_IP_H_
40 #include <sys/cdefs.h>
43 * Definitions for internet protocol version 4.
44 * Per RFC 791, September 1981.
49 * Structure of an internet header, naked of options.
52 #if BYTE_ORDER == LITTLE_ENDIAN
53 u_int ip_hl:4, /* header length */
56 #if BYTE_ORDER == BIG_ENDIAN
57 u_int ip_v:4, /* version */
58 ip_hl:4; /* header length */
60 u_char ip_tos; /* type of service */
61 u_short ip_len; /* total length */
62 u_short ip_id; /* identification */
63 u_short ip_off; /* fragment offset field */
64 #define IP_RF 0x8000 /* reserved fragment flag */
65 #define IP_DF 0x4000 /* dont fragment flag */
66 #define IP_MF 0x2000 /* more fragments flag */
67 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
68 u_char ip_ttl; /* time to live */
69 u_char ip_p; /* protocol */
70 u_short ip_sum; /* checksum */
71 struct in_addr ip_src,ip_dst; /* source and dest address */
75 CTASSERT(sizeof (struct ip) == 20);
78 #define IP_MAXPACKET 65535 /* maximum packet size */
81 * Definitions for IP type of service (ip_tos)
83 #define IPTOS_LOWDELAY 0x10
84 #define IPTOS_THROUGHPUT 0x08
85 #define IPTOS_RELIABILITY 0x04
86 #define IPTOS_MINCOST 0x02
87 /* ECN bits proposed by Sally Floyd */
88 #define IPTOS_CE 0x01 /* congestion experienced */
89 #define IPTOS_ECT 0x02 /* ECN-capable transport */
93 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
95 #define IPTOS_PREC_NETCONTROL 0xe0
96 #define IPTOS_PREC_INTERNETCONTROL 0xc0
97 #define IPTOS_PREC_CRITIC_ECP 0xa0
98 #define IPTOS_PREC_FLASHOVERRIDE 0x80
99 #define IPTOS_PREC_FLASH 0x60
100 #define IPTOS_PREC_IMMEDIATE 0x40
101 #define IPTOS_PREC_PRIORITY 0x20
102 #define IPTOS_PREC_ROUTINE 0x00
105 * Definitions for options.
107 #define IPOPT_COPIED(o) ((o)&0x80)
108 #define IPOPT_CLASS(o) ((o)&0x60)
109 #define IPOPT_NUMBER(o) ((o)&0x1f)
111 #define IPOPT_CONTROL 0x00
112 #define IPOPT_RESERVED1 0x20
113 #define IPOPT_DEBMEAS 0x40
114 #define IPOPT_RESERVED2 0x60
116 #define IPOPT_EOL 0 /* end of option list */
117 #define IPOPT_NOP 1 /* no operation */
119 #define IPOPT_RR 7 /* record packet route */
120 #define IPOPT_TS 68 /* timestamp */
121 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
122 #define IPOPT_LSRR 131 /* loose source route */
123 #define IPOPT_ESO 133 /* extended security */
124 #define IPOPT_CIPSO 134 /* commerical security */
125 #define IPOPT_SATID 136 /* satnet id */
126 #define IPOPT_SSRR 137 /* strict source route */
127 #define IPOPT_RA 148 /* router alert */
130 * Offsets to fields in options other than EOL and NOP.
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 */
138 * Time stamp option structure.
140 struct ip_timestamp {
141 u_char ipt_code; /* IPOPT_TS */
142 u_char ipt_len; /* size of structure (variable) */
143 u_char 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 */
148 #if BYTE_ORDER == BIG_ENDIAN
149 u_int ipt_oflw:4, /* overflow counter */
150 ipt_flg:4; /* flags, see below */
152 union ipt_timestamp {
155 struct in_addr ipt_addr;
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 */
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
176 * Internet implementation parameters.
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 */
183 #define IP_MSS 576 /* default maximum segment size */