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2 * Copyright (c) 1982, 1986, 1993
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5 * Portions copyright (c) 1999, 2000
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10 * modification, are permitted provided that the following conditions
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23 * This product includes software developed by the University of
24 * California, Berkeley, Intel Corporation, and its contributors.
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42 * @(#)ip.h 8.2 (Berkeley) 6/1/94
43 * $Id: ip.h,v 1.1.1.1 2006/05/30 06:12:48 hhzhou Exp $
46 #ifndef _NETINET_IP_H_
47 #define _NETINET_IP_H_
54 * Definitions for internet protocol version 4.
55 * Per RFC 791, September 1981.
60 * Structure of an internet header, naked of options.
64 u_char ip_vhl
; /* version << 4 | header length >> 2 */
66 #if BYTE_ORDER == LITTLE_ENDIAN
67 u_int ip_hl
:4, /* header length */
70 #if BYTE_ORDER == BIG_ENDIAN
71 u_int ip_v
:4, /* version */
72 ip_hl
:4; /* header length */
74 #endif /* not _IP_VHL */
75 u_char ip_tos
; /* type of service */
76 u_short ip_len
; /* total length */
77 u_short ip_id
; /* identification */
78 u_short ip_off
; /* fragment offset field */
79 #define IP_RF 0x8000 /* reserved fragment flag */
80 #define IP_DF 0x4000 /* dont fragment flag */
81 #define IP_MF 0x2000 /* more fragments flag */
82 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
83 u_char ip_ttl
; /* time to live */
84 u_char ip_p
; /* protocol */
85 u_short ip_sum
; /* checksum */
86 struct in_addr ip_src
,ip_dst
; /* source and dest address */
90 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl))
91 #define IP_VHL_HL(vhl) ((vhl) & 0x0f)
92 #define IP_VHL_V(vhl) ((vhl) >> 4)
93 #define IP_VHL_BORING 0x45
96 #define IP_MAXPACKET 65535 /* maximum packet size */
99 * Definitions for IP type of service (ip_tos)
101 #define IPTOS_LOWDELAY 0x10
102 #define IPTOS_THROUGHPUT 0x08
103 #define IPTOS_RELIABILITY 0x04
104 #define IPTOS_MINCOST 0x02
107 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
109 #define IPTOS_PREC_NETCONTROL 0xe0
110 #define IPTOS_PREC_INTERNETCONTROL 0xc0
111 #define IPTOS_PREC_CRITIC_ECP 0xa0
112 #define IPTOS_PREC_FLASHOVERRIDE 0x80
113 #define IPTOS_PREC_FLASH 0x60
114 #define IPTOS_PREC_IMMEDIATE 0x40
115 #define IPTOS_PREC_PRIORITY 0x20
116 #define IPTOS_PREC_ROUTINE 0x00
119 * Definitions for options.
121 #define IPOPT_COPIED(o) ((o)&0x80)
122 #define IPOPT_CLASS(o) ((o)&0x60)
123 #define IPOPT_NUMBER(o) ((o)&0x1f)
125 #define IPOPT_CONTROL 0x00
126 #define IPOPT_RESERVED1 0x20
127 #define IPOPT_DEBMEAS 0x40
128 #define IPOPT_RESERVED2 0x60
130 #define IPOPT_EOL 0 /* end of option list */
131 #define IPOPT_NOP 1 /* no operation */
133 #define IPOPT_RR 7 /* record packet route */
134 #define IPOPT_TS 68 /* timestamp */
135 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
136 #define IPOPT_LSRR 131 /* loose source route */
137 #define IPOPT_SATID 136 /* satnet id */
138 #define IPOPT_SSRR 137 /* strict source route */
139 #define IPOPT_RA 148 /* router alert */
142 * Offsets to fields in options other than EOL and NOP.
144 #define IPOPT_OPTVAL 0 /* option ID */
145 #define IPOPT_OLEN 1 /* option length */
146 #define IPOPT_OFFSET 2 /* offset within option */
147 #define IPOPT_MINOFF 4 /* min value of above */
150 * Time stamp option structure.
152 struct ip_timestamp
{
153 u_char ipt_code
; /* IPOPT_TS */
154 u_char ipt_len
; /* size of structure (variable) */
155 u_char ipt_ptr
; /* index of current entry */
156 #if BYTE_ORDER == LITTLE_ENDIAN
157 u_int ipt_flg
:4, /* flags, see below */
158 ipt_oflw
:4; /* overflow counter */
160 #if BYTE_ORDER == BIG_ENDIAN
161 u_int ipt_oflw
:4, /* overflow counter */
162 ipt_flg
:4; /* flags, see below */
164 union ipt_timestamp
{
167 struct in_addr ipt_addr
;
173 /* flag bits for ipt_flg */
174 #define IPOPT_TS_TSONLY 0 /* timestamps only */
175 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
176 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
178 /* bits for security (not byte swapped) */
179 #define IPOPT_SECUR_UNCLASS 0x0000
180 #define IPOPT_SECUR_CONFID 0xf135
181 #define IPOPT_SECUR_EFTO 0x789a
182 #define IPOPT_SECUR_MMMM 0xbc4d
183 #define IPOPT_SECUR_RESTR 0xaf13
184 #define IPOPT_SECUR_SECRET 0xd788
185 #define IPOPT_SECUR_TOPSECRET 0x6bc5
188 * Internet implementation parameters.
190 #define MAXTTL 255 /* maximum time to live (seconds) */
191 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
192 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
193 #define IPTTLDEC 1 /* subtracted when forwarding */
195 #define IP_MSS 576 /* default maximum segment size */