Annotation of sys/netinet/ip.h, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ip.h,v 1.12 2006/04/27 02:19:32 tedu Exp $ */
2: /* $NetBSD: ip.h,v 1.9 1995/05/15 01:22:44 cgd Exp $ */
3:
4: /*
5: * Copyright (c) 1982, 1986, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the University nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: *
32: * @(#)ip.h 8.1 (Berkeley) 6/10/93
33: */
34:
35: #ifndef _NETINET_IP_H_
36: #define _NETINET_IP_H_
37:
38: /*
39: * Definitions for internet protocol version 4.
40: * Per RFC 791, September 1981.
41: */
42: #define IPVERSION 4
43:
44: /*
45: * Structure of an internet header, naked of options.
46: */
47: struct ip {
48: #if _BYTE_ORDER == _LITTLE_ENDIAN
49: u_int ip_hl:4, /* header length */
50: ip_v:4; /* version */
51: #endif
52: #if _BYTE_ORDER == _BIG_ENDIAN
53: u_int ip_v:4, /* version */
54: ip_hl:4; /* header length */
55: #endif
56: u_int8_t ip_tos; /* type of service */
57: u_int16_t ip_len; /* total length */
58: u_int16_t ip_id; /* identification */
59: u_int16_t ip_off; /* fragment offset field */
60: #define IP_RF 0x8000 /* reserved fragment flag */
61: #define IP_DF 0x4000 /* dont fragment flag */
62: #define IP_MF 0x2000 /* more fragments flag */
63: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
64: u_int8_t ip_ttl; /* time to live */
65: u_int8_t ip_p; /* protocol */
66: u_int16_t ip_sum; /* checksum */
67: struct in_addr ip_src, ip_dst; /* source and dest address */
68: };
69:
70: #define IP_MAXPACKET 65535 /* maximum packet size */
71:
72: /*
73: * Definitions for IP type of service (ip_tos)
74: */
75: #define IPTOS_LOWDELAY 0x10
76: #define IPTOS_THROUGHPUT 0x08
77: #define IPTOS_RELIABILITY 0x04
78: /* IPTOS_LOWCOST 0x02 XXX */
79: #if 1
80: /* ECN RFC3168 obsoletes RFC2481, and these will be deprecated soon. */
81: #define IPTOS_CE 0x01 /* congestion experienced */
82: #define IPTOS_ECT 0x02 /* ECN-capable transport */
83: #endif
84:
85: /*
86: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
87: */
88: #define IPTOS_PREC_NETCONTROL 0xe0
89: #define IPTOS_PREC_INTERNETCONTROL 0xc0
90: #define IPTOS_PREC_CRITIC_ECP 0xa0
91: #define IPTOS_PREC_FLASHOVERRIDE 0x80
92: #define IPTOS_PREC_FLASH 0x60
93: #define IPTOS_PREC_IMMEDIATE 0x40
94: #define IPTOS_PREC_PRIORITY 0x20
95: #define IPTOS_PREC_ROUTINE 0x00
96:
97: /*
98: * ECN (Explicit Congestion Notification) codepoints in RFC3168
99: * mapped to the lower 2 bits of the TOS field.
100: */
101: #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
102: #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
103: #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
104: #define IPTOS_ECN_CE 0x03 /* congestion experienced */
105: #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
106:
107: /*
108: * Definitions for options.
109: */
110: #define IPOPT_COPIED(o) ((o)&0x80)
111: #define IPOPT_CLASS(o) ((o)&0x60)
112: #define IPOPT_NUMBER(o) ((o)&0x1f)
113:
114: #define IPOPT_CONTROL 0x00
115: #define IPOPT_RESERVED1 0x20
116: #define IPOPT_DEBMEAS 0x40
117: #define IPOPT_RESERVED2 0x60
118:
119: #define IPOPT_EOL 0 /* end of option list */
120: #define IPOPT_NOP 1 /* no operation */
121:
122: #define IPOPT_RR 7 /* record packet route */
123: #define IPOPT_TS 68 /* timestamp */
124: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
125: #define IPOPT_LSRR 131 /* loose source route */
126: #define IPOPT_SATID 136 /* satnet id */
127: #define IPOPT_SSRR 137 /* strict source route */
128:
129: /*
130: * Offsets to fields in options other than EOL and NOP.
131: */
132: #define IPOPT_OPTVAL 0 /* option ID */
133: #define IPOPT_OLEN 1 /* option length */
134: #define IPOPT_OFFSET 2 /* offset within option */
135: #define IPOPT_MINOFF 4 /* min value of above */
136:
137: /*
138: * Time stamp option structure.
139: */
140: struct ip_timestamp {
141: u_int8_t ipt_code; /* IPOPT_TS */
142: u_int8_t ipt_len; /* size of structure (variable) */
143: u_int8_t ipt_ptr; /* index of current entry */
144: #if _BYTE_ORDER == _LITTLE_ENDIAN
145: u_int ipt_flg:4, /* flags, see below */
146: ipt_oflw:4; /* overflow counter */
147: #endif
148: #if _BYTE_ORDER == _BIG_ENDIAN
149: u_int ipt_oflw:4, /* overflow counter */
150: ipt_flg:4; /* flags, see below */
151: #endif
152: union ipt_timestamp {
153: n_time ipt_time[1];
154: struct ipt_ta {
155: struct in_addr ipt_addr;
156: n_time ipt_time;
157: } ipt_ta[1];
158: } ipt_timestamp;
159: };
160:
161: /* flag bits for ipt_flg */
162: #define IPOPT_TS_TSONLY 0 /* timestamps only */
163: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
164: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
165:
166: /* bits for security (not byte swapped) */
167: #define IPOPT_SECUR_UNCLASS 0x0000
168: #define IPOPT_SECUR_CONFID 0xf135
169: #define IPOPT_SECUR_EFTO 0x789a
170: #define IPOPT_SECUR_MMMM 0xbc4d
171: #define IPOPT_SECUR_RESTR 0xaf13
172: #define IPOPT_SECUR_SECRET 0xd788
173: #define IPOPT_SECUR_TOPSECRET 0x6bc5
174:
175: /*
176: * Internet implementation parameters.
177: */
178: #define MAXTTL 255 /* maximum time to live (seconds) */
179: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
180: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
181: #define IPTTLDEC 1 /* subtracted when forwarding */
182:
183: #define IP_MSS 576 /* default maximum segment size */
184:
185: /*
186: * This is the real IPv4 pseudo header, used for computing the TCP and UDP
187: * checksums. For the Internet checksum, struct ipovly can be used instead.
188: * For stronger checksums, the real thing must be used.
189: */
190: struct ippseudo {
191: struct in_addr ippseudo_src; /* source internet address */
192: struct in_addr ippseudo_dst; /* destination internet address */
193: u_int8_t ippseudo_pad; /* pad, must be zero */
194: u_int8_t ippseudo_p; /* protocol */
195: u_int16_t ippseudo_len; /* protocol length */
196: };
197: #endif /* _NETINET_IP_H_ */
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