xref: /illumos-gate/usr/src/uts/common/netinet/ip.h (revision 2d6eb4a5)
1 /*
2  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
3  * Use is subject to license terms.
4  */
5 
6 /*
7  * Copyright (c) 1982, 1986 Regents of the University of California.
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms are permitted
11  * provided that this notice is preserved and that due credit is given
12  * to the University of California at Berkeley. The name of the University
13  * may not be used to endorse or promote products derived from this
14  * software without specific prior written permission. This software
15  * is provided ``as is'' without express or implied warranty.
16  */
17 
18 /*
19  * Definitions for internet protocol version 4.
20  * Per RFC 791, September 1981.
21  */
22 
23 #ifndef	_NETINET_IP_H
24 #define	_NETINET_IP_H
25 
26 /* ip.h 1.13 88/08/19 SMI; from UCB 7.6.1.1 3/15/88	*/
27 
28 #include <sys/isa_defs.h>
29 
30 #ifdef	__cplusplus
31 extern "C" {
32 #endif
33 
34 #define	IPVERSION	4
35 
36 /*
37  * Structure of an internet header, naked of options.
38  */
39 struct ip {
40 #ifdef _BIT_FIELDS_LTOH
41 	uchar_t	ip_hl:4,		/* header length */
42 		ip_v:4;			/* version */
43 #else
44 	uchar_t	ip_v:4,			/* version */
45 		ip_hl:4;		/* header length */
46 #endif
47 	uchar_t	ip_tos;			/* type of service */
48 	ushort_t ip_len;		/* total length */
49 	ushort_t ip_id;			/* identification */
50 	ushort_t ip_off;		/* fragment offset field */
51 #define	IP_DF 0x4000			/* dont fragment flag */
52 #define	IP_MF 0x2000			/* more fragments flag */
53 	uchar_t	ip_ttl;			/* time to live */
54 	uchar_t	ip_p;			/* protocol */
55 	ushort_t ip_sum;		/* checksum */
56 	struct	in_addr ip_src, ip_dst;	/* source and dest address */
57 };
58 
59 #define	IP_MAXPACKET	65535		/* maximum packet size */
60 
61 /*
62  * Definitions for IP type of service (ip_tos)
63  */
64 #define	IPTOS_LOWDELAY		0x10
65 #define	IPTOS_THROUGHPUT	0x08
66 #define	IPTOS_RELIABILITY	0x04
67 #define	IPTOS_ECT		0x02	/* ECN-Capable Transport flag */
68 #define	IPTOS_CE		0x01	/* ECN-Congestion Experienced flag */
69 
70 /*
71  * Definitions for IP precedence (also in ip_tos) (hopefully unused)
72  */
73 #define	IPTOS_PREC_NETCONTROL		0xe0
74 #define	IPTOS_PREC_INTERNETCONTROL	0xc0
75 #define	IPTOS_PREC_CRITIC_ECP		0xa0
76 #define	IPTOS_PREC_FLASHOVERRIDE	0x80
77 #define	IPTOS_PREC_FLASH		0x60
78 #define	IPTOS_PREC_IMMEDIATE		0x40
79 #define	IPTOS_PREC_PRIORITY		0x20
80 #define	IPTOS_PREC_ROUTINE		0x00
81 
82 /*
83  * Definitions for options.
84  */
85 
86 /* Bits in the option value */
87 #define	IPOPT_COPY		0x80
88 
89 #define	IPOPT_COPIED(o)		((o)&0x80)
90 #define	IPOPT_CLASS(o)		((o)&0x60)
91 #define	IPOPT_NUMBER(o)		((o)&0x1f)
92 
93 #define	IPOPT_CONTROL		0x00
94 #define	IPOPT_RESERVED1		0x20
95 #define	IPOPT_DEBMEAS		0x40
96 #define	IPOPT_RESERVED2		0x60
97 
98 #define	IPOPT_EOL		0x00		/* end of option list */
99 #define	IPOPT_NOP		0x01		/* no operation */
100 
101 #define	IPOPT_RR		0x07		/* record packet route */
102 #define	IPOPT_RTRALERT		0x14		/* router alert */
103 #define	IPOPT_TS		0x44		/* timestamp */
104 #define	IPOPT_SECURITY		0x82		/* provide s,c,h,tcc */
105 #define	IPOPT_LSRR		0x83		/* loose source route */
106 #define	IPOPT_EXTSEC		0x85
107 #define	IPOPT_COMSEC		0x86
108 #define	IPOPT_SATID		0x88		/* satnet id */
109 #define	IPOPT_SSRR		0x89		/* strict source route */
110 #define	IPOPT_RA		0x94
111 #define	IPOPT_SDMDD		0x95
112 
113 /*
114  * Offsets to fields in options other than EOL and NOP.
115  */
116 #define	IPOPT_OPTVAL		0		/* option ID */
117 #define	IPOPT_OLEN		1		/* option length */
118 #define	IPOPT_OFFSET		2		/* offset within option */
119 #define	IPOPT_POS_OV_FLG	3
120 #define	IPOPT_MINOFF		4		/* min value of IPOPT_OFFSET */
121 
122 
123 /* Minimum for src and record route options */
124 #define	IPOPT_MINOFF_SR		IPOPT_MINOFF
125 
126 /*
127  * Time stamp option structure.
128  */
129 struct	ip_timestamp {
130 	uchar_t	ipt_code;		/* IPOPT_TS */
131 	uchar_t	ipt_len;		/* size of structure (variable) */
132 	uchar_t	ipt_ptr;		/* index of current entry */
133 #ifdef _BIT_FIELDS_LTOH
134 	uchar_t	ipt_flg:4,		/* flags, see below */
135 		ipt_oflw:4;		/* overflow counter */
136 #else
137 	uchar_t	ipt_oflw:4,		/* overflow counter */
138 		ipt_flg:4;		/* flags, see below */
139 #endif
140 	union ipt_timestamp {
141 		uint32_t	ipt_time[1];
142 		struct	ipt_ta {
143 			struct in_addr	ipt_addr;
144 			uint32_t	ipt_time;
145 		} ipt_ta[1];
146 	} ipt_timestamp;
147 };
148 
149 /* flag bits for ipt_flg */
150 #define	IPOPT_TS_TSONLY		0		/* timestamps only */
151 #define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
152 #define	IPOPT_TS_PRESPEC	2		/* specified modules only */
153 #define	IPOPT_TS_PRESPEC_RFC791	3
154 
155 /* Minimum for timestamp option */
156 #define	IPOPT_MINOFF_IT		5
157 #define	IPOPT_MINLEN_IT		5
158 
159 #define	IPOPT_TS_TIMELEN	4	/* Timestamp size */
160 
161 /* bits for security (not byte swapped) */
162 #define	IPOPT_SECUR_UNCLASS	0x0000
163 #define	IPOPT_SECUR_CONFID	0xf135
164 #define	IPOPT_SECUR_EFTO	0x789a
165 #define	IPOPT_SECUR_MMMM	0xbc4d
166 #define	IPOPT_SECUR_RESTR	0xaf13
167 #define	IPOPT_SECUR_SECRET	0xd788
168 #define	IPOPT_SECUR_TOPSECRET	0x6bc5
169 
170 /*
171  * Internet implementation parameters.
172  */
173 #define	MAXTTL		255		/* maximum time to live (seconds) */
174 #define	IPFRAGTTL	60		/* time to live for frags, slowhz */
175 #define	IPTTLDEC	1		/* subtracted when forwarding */
176 
177 #define	IP_MSS		576		/* default maximum segment size */
178 
179 #ifdef	__cplusplus
180 }
181 #endif
182 
183 #endif	/* _NETINET_IP_H */
184