aboutsummaryrefslogtreecommitdiff
path: root/sysdeps/generic/netinet/ip.h
blob: 7f90382c3d7ff9c61969121e21b447fd9a1fea83 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
/* Copyright (C) 1991-2014 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#ifndef __NETINET_IP_H
#define __NETINET_IP_H 1

#include <features.h>
#include <sys/types.h>

#include <netinet/in.h>

__BEGIN_DECLS

struct timestamp
  {
    u_int8_t len;
    u_int8_t ptr;
#if __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned int flags:4;
    unsigned int overflow:4;
#elif __BYTE_ORDER == __BIG_ENDIAN
    unsigned int overflow:4;
    unsigned int flags:4;
#else
# error	"Please fix <bits/endian.h>"
#endif
    u_int32_t data[9];
  };

struct iphdr
  {
#if __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned int ihl:4;
    unsigned int version:4;
#elif __BYTE_ORDER == __BIG_ENDIAN
    unsigned int version:4;
    unsigned int ihl:4;
#else
# error	"Please fix <bits/endian.h>"
#endif
    u_int8_t tos;
    u_int16_t tot_len;
    u_int16_t id;
    u_int16_t frag_off;
    u_int8_t ttl;
    u_int8_t protocol;
    u_int16_t check;
    u_int32_t saddr;
    u_int32_t daddr;
    /*The options start here. */
  };

#ifdef __USE_MISC
/*
 * Copyright (c) 1982, 1986, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)ip.h	8.1 (Berkeley) 6/10/93
 */

/*
 * Definitions for internet protocol version 4.
 * Per RFC 791, September 1981.
 */

/*
 * Structure of an internet header, naked of options.
 */
struct ip
  {
#if __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned int ip_hl:4;		/* header length */
    unsigned int ip_v:4;		/* version */
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
    unsigned int ip_v:4;		/* version */
    unsigned int ip_hl:4;		/* header length */
#endif
    u_int8_t ip_tos;			/* type of service */
    u_short ip_len;			/* total length */
    u_short ip_id;			/* identification */
    u_short ip_off;			/* fragment offset field */
#define	IP_RF 0x8000			/* reserved fragment flag */
#define	IP_DF 0x4000			/* dont fragment flag */
#define	IP_MF 0x2000			/* more fragments flag */
#define	IP_OFFMASK 0x1fff		/* mask for fragmenting bits */
    u_int8_t ip_ttl;			/* time to live */
    u_int8_t ip_p;			/* protocol */
    u_short ip_sum;			/* checksum */
    struct in_addr ip_src, ip_dst;	/* source and dest address */
  };

/*
 * Time stamp option structure.
 */
struct ip_timestamp
  {
    u_int8_t ipt_code;			/* IPOPT_TS */
    u_int8_t ipt_len;			/* size of structure (variable) */
    u_int8_t ipt_ptr;			/* index of current entry */
#if __BYTE_ORDER == __LITTLE_ENDIAN
    unsigned int ipt_flg:4;		/* flags, see below */
    unsigned int ipt_oflw:4;		/* overflow counter */
#endif
#if __BYTE_ORDER == __BIG_ENDIAN
    unsigned int ipt_oflw:4;		/* overflow counter */
    unsigned int ipt_flg:4;		/* flags, see below */
#endif
    u_int32_t data[9];
  };
#endif /* __USE_MISC */

#define	IPVERSION	4               /* IP version number */
#define	IP_MAXPACKET	65535		/* maximum packet size */

/*
 * Definitions for Explicit Congestion Notification (ECN)
 *
 * Taken from RFC-3168, Section 5.
 */

#define	IPTOS_ECN_MASK		0x03
#define	IPTOS_ECN(x)		((x) & IPTOS_ECN_MASK)
#define	IPTOS_ECN_NOT_ECT	0x00
#define	IPTOS_ECN_ECT1		0x01
#define	IPTOS_ECN_ECT0		0x02
#define	IPTOS_ECN_CE		0x03

/*
 * Definitions for IP differentiated services code points (DSCP)
 *
 * Taken from RFC-2597, Section 6 and RFC-2598, Section 2.3.
 */

#define	IPTOS_DSCP_MASK		0xfc
#define	IPTOS_DSCP(x)		((x) & IPTOS_DSCP_MASK)
#define	IPTOS_DSCP_AF11		0x28
#define	IPTOS_DSCP_AF12		0x30
#define	IPTOS_DSCP_AF13		0x38
#define	IPTOS_DSCP_AF21		0x48
#define	IPTOS_DSCP_AF22		0x50
#define	IPTOS_DSCP_AF23		0x58
#define	IPTOS_DSCP_AF31		0x68
#define	IPTOS_DSCP_AF32		0x70
#define	IPTOS_DSCP_AF33		0x78
#define	IPTOS_DSCP_AF41		0x88
#define	IPTOS_DSCP_AF42		0x90
#define	IPTOS_DSCP_AF43		0x98
#define	IPTOS_DSCP_EF		0xb8

/*
 * In RFC 2474, Section 4.2.2.1, the Class Selector Codepoints subsume
 * the old ToS Precedence values.
 */

#define	IPTOS_CLASS_MASK		0xe0
#define	IPTOS_CLASS(class)		((class) & IPTOS_CLASS_MASK)
#define	IPTOS_CLASS_CS0			0x00
#define	IPTOS_CLASS_CS1			0x20
#define	IPTOS_CLASS_CS2			0x40
#define	IPTOS_CLASS_CS3			0x60
#define	IPTOS_CLASS_CS4			0x80
#define	IPTOS_CLASS_CS5			0xa0
#define	IPTOS_CLASS_CS6			0xc0
#define	IPTOS_CLASS_CS7			0xe0

#define	IPTOS_CLASS_DEFAULT		IPTOS_CLASS_CS0

/*
 * Definitions for IP type of service (ip_tos) [deprecated; use DSCP
 * and CS definitions above instead.]
 */
#define	IPTOS_TOS_MASK		0x1E
#define	IPTOS_TOS(tos)		((tos) & IPTOS_TOS_MASK)
#define	IPTOS_LOWDELAY		0x10
#define	IPTOS_THROUGHPUT	0x08
#define	IPTOS_RELIABILITY	0x04
#define	IPTOS_LOWCOST		0x02
#define	IPTOS_MINCOST		IPTOS_LOWCOST

/*
 * Definitions for IP precedence (also in ip_tos) [also deprecated.]
 */
#define	IPTOS_PREC_MASK			IPTOS_CLASS_MASK
#define	IPTOS_PREC(tos)			IPTOS_CLASS(tos)
#define	IPTOS_PREC_NETCONTROL		IPTOS_CLASS_CS7
#define	IPTOS_PREC_INTERNETCONTROL	IPTOS_CLASS_CS6
#define	IPTOS_PREC_CRITIC_ECP		IPTOS_CLASS_CS5
#define	IPTOS_PREC_FLASHOVERRIDE	IPTOS_CLASS_CS4
#define	IPTOS_PREC_FLASH		IPTOS_CLASS_CS3
#define	IPTOS_PREC_IMMEDIATE		IPTOS_CLASS_CS2
#define	IPTOS_PREC_PRIORITY		IPTOS_CLASS_CS1
#define	IPTOS_PREC_ROUTINE		IPTOS_CLASS_CS0

/*
 * Definitions for options.
 */
#define	IPOPT_COPY		0x80
#define	IPOPT_CLASS_MASK	0x60
#define	IPOPT_NUMBER_MASK	0x1f

#define	IPOPT_COPIED(o)		((o) & IPOPT_COPY)
#define	IPOPT_CLASS(o)		((o) & IPOPT_CLASS_MASK)
#define	IPOPT_NUMBER(o)		((o) & IPOPT_NUMBER_MASK)

#define	IPOPT_CONTROL		0x00
#define	IPOPT_RESERVED1		0x20
#define	IPOPT_DEBMEAS		0x40
#define	IPOPT_MEASUREMENT       IPOPT_DEBMEAS
#define	IPOPT_RESERVED2		0x60

#define	IPOPT_EOL		0		/* end of option list */
#define	IPOPT_END		IPOPT_EOL
#define	IPOPT_NOP		1		/* no operation */
#define	IPOPT_NOOP		IPOPT_NOP

#define	IPOPT_RR		7		/* record packet route */
#define	IPOPT_TS		68		/* timestamp */
#define	IPOPT_TIMESTAMP		IPOPT_TS
#define	IPOPT_SECURITY		130		/* provide s,c,h,tcc */
#define	IPOPT_SEC		IPOPT_SECURITY
#define	IPOPT_LSRR		131		/* loose source route */
#define	IPOPT_SATID		136		/* satnet id */
#define	IPOPT_SID		IPOPT_SATID
#define	IPOPT_SSRR		137		/* strict source route */
#define	IPOPT_RA		148		/* router alert */

/*
 * Offsets to fields in options other than EOL and NOP.
 */
#define	IPOPT_OPTVAL		0		/* option ID */
#define	IPOPT_OLEN		1		/* option length */
#define	IPOPT_OFFSET		2		/* offset within option */
#define	IPOPT_MINOFF		4		/* min value of above */

#define	MAX_IPOPTLEN		40

/* flag bits for ipt_flg */
#define	IPOPT_TS_TSONLY		0		/* timestamps only */
#define	IPOPT_TS_TSANDADDR	1		/* timestamps and addresses */
#define	IPOPT_TS_PRESPEC	3		/* specified modules only */

/* bits for security (not byte swapped) */
#define	IPOPT_SECUR_UNCLASS	0x0000
#define	IPOPT_SECUR_CONFID	0xf135
#define	IPOPT_SECUR_EFTO	0x789a
#define	IPOPT_SECUR_MMMM	0xbc4d
#define	IPOPT_SECUR_RESTR	0xaf13
#define	IPOPT_SECUR_SECRET	0xd788
#define	IPOPT_SECUR_TOPSECRET	0x6bc5

/*
 * Internet implementation parameters.
 */
#define	MAXTTL		255		/* maximum time to live (seconds) */
#define	IPDEFTTL	64		/* default ttl, from RFC 1340 */
#define	IPFRAGTTL	60		/* time to live for frags, slowhz */
#define	IPTTLDEC	1		/* subtracted when forwarding */

#define	IP_MSS		576		/* default maximum segment size */

__END_DECLS

#endif /* netinet/ip.h */