drm/linux: Add config_enabled()
[dragonfly.git] / sys / netinet / ip.h
blobf623f585c0e50b2cfed8b7a30dba3a1c26f30756
1 /*
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
29 * @(#)ip.h 8.2 (Berkeley) 6/1/94
30 * $FreeBSD: src/sys/netinet/ip.h,v 1.17 1999/12/22 19:13:20 shin Exp $
33 #ifndef _NETINET_IP_H_
34 #define _NETINET_IP_H_
36 #ifndef _SYS_TYPES_H_
37 #include <sys/types.h>
38 #endif
39 #ifndef _NETINET_IN_H_
40 #include <netinet/in.h>
41 #endif
42 #ifndef _NETINET_IN_SYSTM_H_
43 #include <netinet/in_systm.h>
44 #endif
45 #include <machine/endian.h>
48 * Definitions for internet protocol version 4.
49 * Per RFC 791, September 1981.
51 #define IPVERSION 4
54 * Structure of an internet header, naked of options.
56 struct ip {
57 #ifdef _IP_VHL
58 u_char ip_vhl; /* version << 4 | header length >> 2 */
59 #elif _BYTE_ORDER == _LITTLE_ENDIAN
60 u_int ip_hl:4, /* header length */
61 ip_v:4; /* version */
62 #elif _BYTE_ORDER == _BIG_ENDIAN
63 u_int ip_v:4, /* version */
64 ip_hl:4; /* header length */
65 #else
66 #error "Byte order not implemented"
67 #endif
68 u_char ip_tos; /* type of service */
69 u_short ip_len; /* total length */
70 u_short ip_id; /* identification */
71 u_short ip_off; /* fragment offset field */
72 #define IP_RF 0x8000 /* reserved fragment flag */
73 #define IP_DF 0x4000 /* dont fragment flag */
74 #define IP_MF 0x2000 /* more fragments flag */
75 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
76 u_char ip_ttl; /* time to live */
77 u_char ip_p; /* protocol */
78 u_short ip_sum; /* checksum */
79 struct in_addr ip_src,ip_dst; /* source and dest address */
82 #ifdef _IP_VHL
83 #define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl))
84 #define IP_VHL_HL(vhl) ((vhl) & 0x0f)
85 #define IP_VHL_V(vhl) ((vhl) >> 4)
86 #define IP_VHL_BORING 0x45
87 #endif
89 #define IP_MAXPACKET 65535 /* maximum packet size */
92 * Definitions for IP type of service (ip_tos).
94 #define IPTOS_LOWDELAY 0x10
95 #define IPTOS_THROUGHPUT 0x08
96 #define IPTOS_RELIABILITY 0x04
97 #define IPTOS_MINCOST 0x02
98 #if 1
99 /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
100 #define IPTOS_CE 0x01 /* congestion experienced */
101 #define IPTOS_ECT 0x02 /* ECN-capable transport */
102 #endif
105 * Definitions for IP precedence (also in ip_tos) (deprecated).
107 #define IPTOS_PREC_NETCONTROL IPTOS_DSCP_CS7
108 #define IPTOS_PREC_INTERNETCONTROL IPTOS_DSCP_CS6
109 #define IPTOS_PREC_CRITIC_ECP IPTOS_DSCP_CS5
110 #define IPTOS_PREC_FLASHOVERRIDE IPTOS_DSCP_CS4
111 #define IPTOS_PREC_FLASH IPTOS_DSCP_CS3
112 #define IPTOS_PREC_IMMEDIATE IPTOS_DSCP_CS2
113 #define IPTOS_PREC_PRIORITY IPTOS_DSCP_CS1
114 #define IPTOS_PREC_ROUTINE IPTOS_DSCP_CS0
117 * Definitions for DiffServ Codepoints as per RFC2474 and RFC5865.
119 #define IPTOS_DSCP_CS0 0x00
120 #define IPTOS_DSCP_CS1 0x20
121 #define IPTOS_DSCP_AF11 0x28
122 #define IPTOS_DSCP_AF12 0x30
123 #define IPTOS_DSCP_AF13 0x38
124 #define IPTOS_DSCP_CS2 0x40
125 #define IPTOS_DSCP_AF21 0x48
126 #define IPTOS_DSCP_AF22 0x50
127 #define IPTOS_DSCP_AF23 0x58
128 #define IPTOS_DSCP_CS3 0x60
129 #define IPTOS_DSCP_AF31 0x68
130 #define IPTOS_DSCP_AF32 0x70
131 #define IPTOS_DSCP_AF33 0x78
132 #define IPTOS_DSCP_CS4 0x80
133 #define IPTOS_DSCP_AF41 0x88
134 #define IPTOS_DSCP_AF42 0x90
135 #define IPTOS_DSCP_AF43 0x98
136 #define IPTOS_DSCP_CS5 0xa0
137 #define IPTOS_DSCP_VA 0xb0
138 #define IPTOS_DSCP_EF 0xb8
139 #define IPTOS_DSCP_CS6 0xc0
140 #define IPTOS_DSCP_CS7 0xe0
143 * ECN (Explicit Congestion Notification) codepoints in RFC3168
144 * mapped to the lower 2 bits of the TOS field.
146 #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
147 #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
148 #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
149 #define IPTOS_ECN_CE 0x03 /* congestion experienced */
150 #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
153 * Definitions for options.
155 #define IPOPT_COPIED(o) ((o)&0x80)
156 #define IPOPT_CLASS(o) ((o)&0x60)
157 #define IPOPT_NUMBER(o) ((o)&0x1f)
159 #define IPOPT_CONTROL 0x00
160 #define IPOPT_RESERVED1 0x20
161 #define IPOPT_DEBMEAS 0x40
162 #define IPOPT_RESERVED2 0x60
164 #define IPOPT_EOL 0 /* end of option list */
165 #define IPOPT_NOP 1 /* no operation */
167 #define IPOPT_RR 7 /* record packet route */
168 #define IPOPT_TS 68 /* timestamp */
169 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
170 #define IPOPT_LSRR 131 /* loose source route */
171 #define IPOPT_SATID 136 /* satnet id */
172 #define IPOPT_SSRR 137 /* strict source route */
173 #define IPOPT_RA 148 /* router alert */
176 * Offsets to fields in options other than EOL and NOP.
178 #define IPOPT_OPTVAL 0 /* option ID */
179 #define IPOPT_OLEN 1 /* option length */
180 #define IPOPT_OFFSET 2 /* offset within option */
181 #define IPOPT_MINOFF 4 /* min value of above */
184 * Time stamp option structure.
186 struct ip_timestamp {
187 u_char ipt_code; /* IPOPT_TS */
188 u_char ipt_len; /* size of structure (variable) */
189 u_char ipt_ptr; /* index of current entry */
190 #if _BYTE_ORDER == _LITTLE_ENDIAN
191 u_int ipt_flg:4, /* flags, see below */
192 ipt_oflw:4; /* overflow counter */
193 #elif _BYTE_ORDER == _BIG_ENDIAN
194 u_int ipt_oflw:4, /* overflow counter */
195 ipt_flg:4; /* flags, see below */
196 #else
197 #error "Byte order not implemented"
198 #endif
199 union ipt_timestamp {
200 n_long ipt_time[1];
201 struct ipt_ta {
202 struct in_addr ipt_addr;
203 n_long ipt_time;
204 } ipt_ta[1];
205 } ipt_timestamp;
208 /* Flag bits for ipt_flg. */
209 #define IPOPT_TS_TSONLY 0 /* timestamps only */
210 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
211 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
213 /* Bits for security (not byte swapped). */
214 #define IPOPT_SECUR_UNCLASS 0x0000
215 #define IPOPT_SECUR_CONFID 0xf135
216 #define IPOPT_SECUR_EFTO 0x789a
217 #define IPOPT_SECUR_MMMM 0xbc4d
218 #define IPOPT_SECUR_RESTR 0xaf13
219 #define IPOPT_SECUR_SECRET 0xd788
220 #define IPOPT_SECUR_TOPSECRET 0x6bc5
223 * Internet implementation parameters.
225 #define MAXTTL 255 /* maximum time to live (seconds) */
226 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
227 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
228 #define IPTTLDEC 1 /* subtracted when forwarding */
229 #define IP_MSS 576 /* default maximum segment size */
232 * This is the real IPv4 pseudo header, used for computing the TCP and UDP
233 * checksums. For the Internet checksum, struct ipovly can be used instead.
234 * For stronger checksums, the real thing must be used.
236 struct ippseudo {
237 struct in_addr ippseudo_src; /* source internet address */
238 struct in_addr ippseudo_dst; /* destination internet address */
239 u_int8_t ippseudo_pad; /* pad, must be zero */
240 u_int8_t ippseudo_p; /* protocol */
241 u_int16_t ippseudo_len; /* protocol length */
242 } __packed;
243 #endif