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 8.1 (Berkeley) 6/10/93
36 #ifndef _NETINET_IP_H_
37 #define _NETINET_IP_H_
40 * Definitions for internet protocol version 4.
41 * Per RFC 791, September 1981.
46 * Structure of an internet header, naked of options.
48 * We declare ip_len and ip_off to be short, rather than u_short
49 * pragmatically since otherwise unsigned comparisons can result
50 * against negative integers quite easily, and fail in subtle ways.
53 #if BYTE_ORDER == LITTLE_ENDIAN
54 u_char ip_hl
:4, /* header length */
57 #if BYTE_ORDER == BIG_ENDIAN
58 u_char ip_v
:4, /* version */
59 ip_hl
:4; /* header length */
61 u_char ip_tos
; /* type of service */
62 short ip_len
; /* total length */
63 u_short ip_id
; /* identification */
64 short ip_off
; /* fragment offset field */
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 */
74 #define IP_MAXPACKET 65535 /* maximum packet size */
77 * Definitions for IP type of service (ip_tos)
79 #define IPTOS_LOWDELAY 0x10
80 #define IPTOS_THROUGHPUT 0x08
81 #define IPTOS_RELIABILITY 0x04
82 #define IPTOS_MINCOST 0x02
85 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
87 #define IPTOS_PREC_NETCONTROL 0xe0
88 #define IPTOS_PREC_INTERNETCONTROL 0xc0
89 #define IPTOS_PREC_CRITIC_ECP 0xa0
90 #define IPTOS_PREC_FLASHOVERRIDE 0x80
91 #define IPTOS_PREC_FLASH 0x60
92 #define IPTOS_PREC_IMMEDIATE 0x40
93 #define IPTOS_PREC_PRIORITY 0x20
94 #define IPTOS_PREC_ROUTINE 0x00
97 * Definitions for options.
99 #define IPOPT_COPIED(o) ((o)&0x80)
100 #define IPOPT_CLASS(o) ((o)&0x60)
101 #define IPOPT_NUMBER(o) ((o)&0x1f)
103 #define IPOPT_CONTROL 0x00
104 #define IPOPT_RESERVED1 0x20
105 #define IPOPT_DEBMEAS 0x40
106 #define IPOPT_RESERVED2 0x60
108 #define IPOPT_EOL 0 /* end of option list */
109 #define IPOPT_NOP 1 /* no operation */
111 #define IPOPT_RR 7 /* record packet route */
112 #define IPOPT_TS 68 /* timestamp */
113 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
114 #define IPOPT_LSRR 131 /* loose source route */
115 #define IPOPT_SATID 136 /* satnet id */
116 #define IPOPT_SSRR 137 /* strict source route */
119 * Offsets to fields in options other than EOL and NOP.
121 #define IPOPT_OPTVAL 0 /* option ID */
122 #define IPOPT_OLEN 1 /* option length */
123 #define IPOPT_OFFSET 2 /* offset within option */
124 #define IPOPT_MINOFF 4 /* min value of above */
127 * Time stamp option structure.
129 struct ip_timestamp
{
130 u_char ipt_code
; /* IPOPT_TS */
131 u_char ipt_len
; /* size of structure (variable) */
132 u_char ipt_ptr
; /* index of current entry */
133 #if BYTE_ORDER == LITTLE_ENDIAN
134 u_char ipt_flg
:4, /* flags, see below */
135 ipt_oflw
:4; /* overflow counter */
137 #if BYTE_ORDER == BIG_ENDIAN
138 u_char ipt_oflw
:4, /* overflow counter */
139 ipt_flg
:4; /* flags, see below */
141 union ipt_timestamp
{
144 struct in_addr ipt_addr
;
150 /* flag bits for ipt_flg */
151 #define IPOPT_TS_TSONLY 0 /* timestamps only */
152 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
153 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
155 /* bits for security (not byte swapped) */
156 #define IPOPT_SECUR_UNCLASS 0x0000
157 #define IPOPT_SECUR_CONFID 0xf135
158 #define IPOPT_SECUR_EFTO 0x789a
159 #define IPOPT_SECUR_MMMM 0xbc4d
160 #define IPOPT_SECUR_RESTR 0xaf13
161 #define IPOPT_SECUR_SECRET 0xd788
162 #define IPOPT_SECUR_TOPSECRET 0x6bc5
165 * Internet implementation parameters.
167 #define MAXTTL 255 /* maximum time to live (seconds) */
168 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
169 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
170 #define IPTTLDEC 1 /* subtracted when forwarding */
172 #define IP_MSS 576 /* default maximum segment size */