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1/*
2 * Copyright (c) 2000-2016 Apple Inc. All rights reserved.
3 *
4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. The rights granted to you under the License
10 * may not be used to create, or enable the creation or redistribution of,
11 * unlawful or unlicensed copies of an Apple operating system, or to
12 * circumvent, violate, or enable the circumvention or violation of, any
13 * terms of an Apple operating system software license agreement.
14 *
15 * Please obtain a copy of the License at
16 * http://www.opensource.apple.com/apsl/ and read it before using this file.
17 *
18 * The Original Code and all software distributed under the License are
19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23 * Please see the License for the specific language governing rights and
24 * limitations under the License.
25 *
26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27 */
28/*
29 * Copyright (c) 1982, 1986, 1993
30 * The Regents of the University of California. All rights reserved.
31 *
32 * Redistribution and use in source and binary forms, with or without
33 * modification, are permitted provided that the following conditions
34 * are met:
35 * 1. Redistributions of source code must retain the above copyright
36 * notice, this list of conditions and the following disclaimer.
37 * 2. Redistributions in binary form must reproduce the above copyright
38 * notice, this list of conditions and the following disclaimer in the
39 * documentation and/or other materials provided with the distribution.
40 * 3. All advertising materials mentioning features or use of this software
41 * must display the following acknowledgement:
42 * This product includes software developed by the University of
43 * California, Berkeley and its contributors.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)ip.h 8.2 (Berkeley) 6/1/94
61 * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $
62 */
63
64#ifndef _NETINET_IP_H_
65#define _NETINET_IP_H_
66#include <sys/appleapiopts.h>
67#include <sys/types.h> /* XXX temporary hack to get u_ types */
68
69#include <netinet/in.h>
70#include <netinet/in_systm.h>
71
72/*
73 * Definitions for internet protocol version 4.
74 * Per RFC 791, September 1981.
75 */
76#define IPVERSION 4
77
78/*
79 * Structure of an internet header, naked of options.
80 */
81struct ip {
82#ifdef _IP_VHL
83 u_char ip_vhl; /* version << 4 | header length >> 2 */
84#else
85#if BYTE_ORDER == LITTLE_ENDIAN
86 u_int ip_hl:4, /* header length */
87 ip_v:4; /* version */
88#endif
89#if BYTE_ORDER == BIG_ENDIAN
90 u_int ip_v:4, /* version */
91 ip_hl:4; /* header length */
92#endif
93#endif /* not _IP_VHL */
94 u_char ip_tos; /* type of service */
95 u_short ip_len; /* total length */
96 u_short ip_id; /* identification */
97 u_short ip_off; /* fragment offset field */
98#define IP_RF 0x8000 /* reserved fragment flag */
99#define IP_DF 0x4000 /* dont fragment flag */
100#define IP_MF 0x2000 /* more fragments flag */
101#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
102 u_char ip_ttl; /* time to live */
103 u_char ip_p; /* protocol */
104 u_short ip_sum; /* checksum */
105 struct in_addr ip_src, ip_dst; /* source and dest address */
106};
107
108#ifdef _IP_VHL
109#define IP_MAKE_VHL(v, hl) ((uint8_t)((v) << 4 | (hl)))
110#define IP_VHL_HL(vhl) ((vhl) & 0x0f)
111#define IP_VHL_V(vhl) ((vhl) >> 4)
112#define IP_VHL_BORING 0x45
113#endif
114
115#define IP_MAXPACKET 65535 /* maximum packet size */
116
117/*
118 * Definitions for IP type of service (ip_tos)
119 */
120#define IPTOS_LOWDELAY 0x10
121#define IPTOS_THROUGHPUT 0x08
122#define IPTOS_RELIABILITY 0x04
123#define IPTOS_MINCOST 0x02
124#if 1
125/* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
126#define IPTOS_CE 0x01
127#define IPTOS_ECT 0x02
128#endif
129
130#define IPTOS_DSCP_SHIFT 2
131
132/*
133 * ECN (Explicit Congestion Notification) codepoints in RFC3168
134 * mapped to the lower 2 bits of the TOS field.
135 */
136#define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
137#define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
138#define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
139#define IPTOS_ECN_CE 0x03 /* congestion experienced */
140#define IPTOS_ECN_MASK 0x03 /* ECN field mask */
141
142/*
143 * Definitions for IP precedence (also in ip_tos) (hopefully unused)
144 */
145#define IPTOS_PREC_NETCONTROL 0xe0
146#define IPTOS_PREC_INTERNETCONTROL 0xc0
147#define IPTOS_PREC_CRITIC_ECP 0xa0
148#define IPTOS_PREC_FLASHOVERRIDE 0x80
149#define IPTOS_PREC_FLASH 0x60
150#define IPTOS_PREC_IMMEDIATE 0x40
151#define IPTOS_PREC_PRIORITY 0x20
152#define IPTOS_PREC_ROUTINE 0x00
153
154/*
155 * Definitions for options.
156 */
157#define IPOPT_COPIED(o) ((o)&0x80)
158#define IPOPT_CLASS(o) ((o)&0x60)
159#define IPOPT_NUMBER(o) ((o)&0x1f)
160
161#define IPOPT_CONTROL 0x00
162#define IPOPT_RESERVED1 0x20
163#define IPOPT_DEBMEAS 0x40
164#define IPOPT_RESERVED2 0x60
165
166#define IPOPT_EOL 0 /* end of option list */
167#define IPOPT_NOP 1 /* no operation */
168
169#define IPOPT_RR 7 /* record packet route */
170#define IPOPT_TS 68 /* timestamp */
171#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
172#define IPOPT_LSRR 131 /* loose source route */
173#define IPOPT_SATID 136 /* satnet id */
174#define IPOPT_SSRR 137 /* strict source route */
175#define IPOPT_RA 148 /* router alert */
176
177/*
178 * Offsets to fields in options other than EOL and NOP.
179 */
180#define IPOPT_OPTVAL 0 /* option ID */
181#define IPOPT_OLEN 1 /* option length */
182#define IPOPT_OFFSET 2 /* offset within option */
183#define IPOPT_MINOFF 4 /* min value of above */
184
185/*
186 * Time stamp option structure.
187 */
188struct ip_timestamp {
189 u_char ipt_code; /* IPOPT_TS */
190 u_char ipt_len; /* size of structure (variable) */
191 u_char ipt_ptr; /* index of current entry */
192#if BYTE_ORDER == LITTLE_ENDIAN
193 u_int ipt_flg:4, /* flags, see below */
194 ipt_oflw:4; /* overflow counter */
195#endif
196#if BYTE_ORDER == BIG_ENDIAN
197 u_int ipt_oflw:4, /* overflow counter */
198 ipt_flg:4; /* flags, see below */
199#endif
200 union ipt_timestamp {
201 n_long ipt_time[1];
202 struct ipt_ta {
203 struct in_addr ipt_addr;
204 n_long ipt_time;
205 } ipt_ta[1];
206 } ipt_timestamp;
207};
208
209/* flag bits for ipt_flg */
210#define IPOPT_TS_TSONLY 0 /* timestamps only */
211#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
212#define IPOPT_TS_PRESPEC 3 /* specified modules only */
213
214/* bits for security (not byte swapped) */
215#define IPOPT_SECUR_UNCLASS 0x0000
216#define IPOPT_SECUR_CONFID 0xf135
217#define IPOPT_SECUR_EFTO 0x789a
218#define IPOPT_SECUR_MMMM 0xbc4d
219#define IPOPT_SECUR_RESTR 0xaf13
220#define IPOPT_SECUR_SECRET 0xd788
221#define IPOPT_SECUR_TOPSECRET 0x6bc5
222
223/*
224 * Internet implementation parameters.
225 */
226#define MAXTTL 255 /* maximum time to live (seconds) */
227#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
228#define IPFRAGTTL 30 /* time to live for frags (seconds) */
229#define IPTTLDEC 1 /* subtracted when forwarding */
230
231#define IP_MSS 576 /* default maximum segment size */
232
233#endif