Annotation of src/sys/netinet/ip.h, Revision 1.31
1.31 ! perry 1: /* $NetBSD: ip.h,v 1.30 2007/12/21 02:07:54 matt Exp $ */
1.6 cgd 2:
1.1 cgd 3: /*
1.5 mycroft 4: * Copyright (c) 1982, 1986, 1993
5: * The Regents of the University of California. All rights reserved.
1.1 cgd 6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.25 agc 15: * 3. Neither the name of the University nor the names of its contributors
1.1 cgd 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: *
1.17 thorpej 31: * @(#)ip.h 8.2 (Berkeley) 6/1/94
1.1 cgd 32: */
33:
1.18 perry 34: #ifndef _NETINET_IP_H_
35: #define _NETINET_IP_H_
36:
1.1 cgd 37: /*
38: * Definitions for internet protocol version 4.
39: * Per RFC 791, September 1981.
40: */
41: #define IPVERSION 4
42:
43: /*
44: * Structure of an internet header, naked of options.
45: */
46: struct ip {
1.4 mycroft 47: #if BYTE_ORDER == LITTLE_ENDIAN
1.29 christos 48: unsigned int ip_hl:4, /* header length */
49: ip_v:4; /* version */
1.1 cgd 50: #endif
1.4 mycroft 51: #if BYTE_ORDER == BIG_ENDIAN
1.29 christos 52: unsigned int ip_v:4, /* version */
53: ip_hl:4; /* header length */
1.1 cgd 54: #endif
1.7 cgd 55: u_int8_t ip_tos; /* type of service */
1.15 thorpej 56: u_int16_t ip_len; /* total length */
1.7 cgd 57: u_int16_t ip_id; /* identification */
1.15 thorpej 58: u_int16_t ip_off; /* fragment offset field */
1.16 mycroft 59: #define IP_RF 0x8000 /* reserved fragment flag */
1.24 dogcow 60: #define IP_EF 0x8000 /* evil flag, per RFC 3514 */
1.1 cgd 61: #define IP_DF 0x4000 /* dont fragment flag */
62: #define IP_MF 0x2000 /* more fragments flag */
1.5 mycroft 63: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
1.7 cgd 64: u_int8_t ip_ttl; /* time to live */
65: u_int8_t ip_p; /* protocol */
66: u_int16_t ip_sum; /* checksum */
1.8 cgd 67: struct in_addr ip_src, ip_dst; /* source and dest address */
1.31 ! perry 68: } __packed;
1.1 cgd 69:
70: #define IP_MAXPACKET 65535 /* maximum packet size */
1.30 matt 71: #define IP_MINFRAGSIZE 69 /* minumum size that can be fraged */
1.1 cgd 72:
73: /*
74: * Definitions for IP type of service (ip_tos)
75: */
76: #define IPTOS_LOWDELAY 0x10
77: #define IPTOS_THROUGHPUT 0x08
78: #define IPTOS_RELIABILITY 0x04
1.9 cgd 79: /* IPTOS_LOWCOST 0x02 XXX */
1.1 cgd 80:
81: /*
82: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
83: */
84: #define IPTOS_PREC_NETCONTROL 0xe0
85: #define IPTOS_PREC_INTERNETCONTROL 0xc0
86: #define IPTOS_PREC_CRITIC_ECP 0xa0
87: #define IPTOS_PREC_FLASHOVERRIDE 0x80
88: #define IPTOS_PREC_FLASH 0x60
89: #define IPTOS_PREC_IMMEDIATE 0x40
90: #define IPTOS_PREC_PRIORITY 0x20
1.9 cgd 91: #define IPTOS_PREC_ROUTINE 0x00
1.23 itojun 92:
93: /*
94: * ECN (Explicit Congestion Notification) codepoints in RFC3168
95: * mapped to the lower 2 bits of the TOS field.
96: */
97: #define IPTOS_ECN_NOTECT 0x00 /* not-ECT */
98: #define IPTOS_ECN_ECT1 0x01 /* ECN-capable transport (1) */
99: #define IPTOS_ECN_ECT0 0x02 /* ECN-capable transport (0) */
100: #define IPTOS_ECN_CE 0x03 /* congestion experienced */
101: #define IPTOS_ECN_MASK 0x03 /* ECN field mask */
1.1 cgd 102:
103: /*
104: * Definitions for options.
105: */
106: #define IPOPT_COPIED(o) ((o)&0x80)
107: #define IPOPT_CLASS(o) ((o)&0x60)
108: #define IPOPT_NUMBER(o) ((o)&0x1f)
109:
110: #define IPOPT_CONTROL 0x00
111: #define IPOPT_RESERVED1 0x20
112: #define IPOPT_DEBMEAS 0x40
113: #define IPOPT_RESERVED2 0x60
114:
115: #define IPOPT_EOL 0 /* end of option list */
116: #define IPOPT_NOP 1 /* no operation */
117:
118: #define IPOPT_RR 7 /* record packet route */
119: #define IPOPT_TS 68 /* timestamp */
120: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
121: #define IPOPT_LSRR 131 /* loose source route */
122: #define IPOPT_SATID 136 /* satnet id */
123: #define IPOPT_SSRR 137 /* strict source route */
124:
125: /*
126: * Offsets to fields in options other than EOL and NOP.
127: */
128: #define IPOPT_OPTVAL 0 /* option ID */
129: #define IPOPT_OLEN 1 /* option length */
1.4 mycroft 130: #define IPOPT_OFFSET 2 /* offset within option */
1.1 cgd 131: #define IPOPT_MINOFF 4 /* min value of above */
132:
133: /*
134: * Time stamp option structure.
135: */
136: struct ip_timestamp {
1.7 cgd 137: u_int8_t ipt_code; /* IPOPT_TS */
138: u_int8_t ipt_len; /* size of structure (variable) */
139: u_int8_t ipt_ptr; /* index of current entry */
1.4 mycroft 140: #if BYTE_ORDER == LITTLE_ENDIAN
1.29 christos 141: unsigned int ipt_flg:4, /* flags, see below */
142: ipt_oflw:4; /* overflow counter */
1.1 cgd 143: #endif
1.4 mycroft 144: #if BYTE_ORDER == BIG_ENDIAN
1.29 christos 145: unsigned int ipt_oflw:4, /* overflow counter */
146: ipt_flg:4; /* flags, see below */
1.1 cgd 147: #endif
148: union ipt_timestamp {
1.8 cgd 149: n_time ipt_time[1];
150: struct ipt_ta {
1.1 cgd 151: struct in_addr ipt_addr;
1.7 cgd 152: n_time ipt_time;
1.31 ! perry 153: } ipt_ta[1] __packed;
! 154: } ipt_timestamp __packed;
! 155: } __packed;
1.1 cgd 156:
157: /* flag bits for ipt_flg */
158: #define IPOPT_TS_TSONLY 0 /* timestamps only */
159: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
160: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
161:
162: /* bits for security (not byte swapped) */
163: #define IPOPT_SECUR_UNCLASS 0x0000
164: #define IPOPT_SECUR_CONFID 0xf135
165: #define IPOPT_SECUR_EFTO 0x789a
166: #define IPOPT_SECUR_MMMM 0xbc4d
167: #define IPOPT_SECUR_RESTR 0xaf13
168: #define IPOPT_SECUR_SECRET 0xd788
169: #define IPOPT_SECUR_TOPSECRET 0x6bc5
170:
171: /*
172: * Internet implementation parameters.
173: */
174: #define MAXTTL 255 /* maximum time to live (seconds) */
1.5 mycroft 175: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
1.1 cgd 176: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
177: #define IPTTLDEC 1 /* subtracted when forwarding */
178:
179: #define IP_MSS 576 /* default maximum segment size */
1.18 perry 180:
1.26 jonathan 181: /*
182: * This is the real IPv4 pseudo header, used for computing the TCP and UDP
183: * checksums. For the Internet checksum, struct ipovly can be used instead.
184: * For stronger checksums, the real thing must be used.
185: */
186: struct ippseudo {
187: struct in_addr ippseudo_src; /* source internet address */
188: struct in_addr ippseudo_dst; /* destination internet address */
189: u_int8_t ippseudo_pad; /* pad, must be zero */
190: u_int8_t ippseudo_p; /* protocol */
191: u_int16_t ippseudo_len; /* protocol length */
192: } __packed;
1.27 elad 193: #endif /* !_NETINET_IP_H_ */
1.29 christos 194:
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