Annotation of embedaddon/iftop/ip.h, revision 1.1.1.1
1.1 misho 1: /* @(#) $Header: /home/pdw/vcvs/repos/iftop/ip.h,v 1.2 2003/06/06 22:42:35 pdw Exp $ (LBL) */
2: /*
3: * Copyright (c) 1982, 1986, 1993
4: * The Regents of the University of California. All rights reserved.
5: *
6: * Redistribution and use in source and binary forms, with or without
7: * modification, are permitted provided that the following conditions
8: * are met:
9: * 1. Redistributions of source code must retain the above copyright
10: * notice, this list of conditions and the following disclaimer.
11: * 2. Redistributions in binary form must reproduce the above copyright
12: * notice, this list of conditions and the following disclaimer in the
13: * documentation and/or other materials provided with the distribution.
14: * 3. All advertising materials mentioning features or use of this software
15: * must display the following acknowledgement:
16: * This product includes software developed by the University of
17: * California, Berkeley and its contributors.
18: * 4. Neither the name of the University nor the names of its contributors
19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: *
34: * @(#)ip.h 8.2 (Berkeley) 6/1/94
35: */
36:
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: * We declare ip_len and ip_off to be short, rather than u_short
47: * pragmatically since otherwise unsigned comparisons can result
48: * against negative integers quite easily, and fail in subtle ways.
49: */
50: struct ip {
51: u_int8_t ip_vhl; /* header length, version */
52: #define IP_V(ip) (((ip)->ip_vhl & 0xf0) >> 4)
53: #define IP_HL(ip) ((ip)->ip_vhl & 0x0f)
54: u_int8_t ip_tos; /* type of service */
55: u_int16_t ip_len; /* total length */
56: u_int16_t ip_id; /* identification */
57: u_int16_t ip_off; /* fragment offset field */
58: #define IP_DF 0x4000 /* dont fragment flag */
59: #define IP_MF 0x2000 /* more fragments flag */
60: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
61: u_int8_t ip_ttl; /* time to live */
62: u_int8_t ip_p; /* protocol */
63: u_int16_t ip_sum; /* checksum */
64: struct in_addr ip_src,ip_dst; /* source and dest address */
65: };
66:
67: #define IP_MAXPACKET 65535 /* maximum packet size */
68:
69: /*
70: * Definitions for IP type of service (ip_tos)
71: */
72: #define IPTOS_LOWDELAY 0x10
73: #define IPTOS_THROUGHPUT 0x08
74: #define IPTOS_RELIABILITY 0x04
75:
76: /*
77: * Definitions for IP precedence (also in ip_tos) (hopefully unused)
78: */
79: #define IPTOS_PREC_NETCONTROL 0xe0
80: #define IPTOS_PREC_INTERNETCONTROL 0xc0
81: #define IPTOS_PREC_CRITIC_ECP 0xa0
82: #define IPTOS_PREC_FLASHOVERRIDE 0x80
83: #define IPTOS_PREC_FLASH 0x60
84: #define IPTOS_PREC_IMMEDIATE 0x40
85: #define IPTOS_PREC_PRIORITY 0x20
86: #define IPTOS_PREC_ROUTINE 0x00
87:
88: /*
89: * Definitions for options.
90: */
91: #define IPOPT_COPIED(o) ((o)&0x80)
92: #define IPOPT_CLASS(o) ((o)&0x60)
93: #define IPOPT_NUMBER(o) ((o)&0x1f)
94:
95: #define IPOPT_CONTROL 0x00
96: #define IPOPT_RESERVED1 0x20
97: #define IPOPT_DEBMEAS 0x40
98: #define IPOPT_RESERVED2 0x60
99:
100: #define IPOPT_EOL 0 /* end of option list */
101: #define IPOPT_NOP 1 /* no operation */
102:
103: #define IPOPT_RR 7 /* record packet route */
104: #define IPOPT_TS 68 /* timestamp */
105: #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
106: #define IPOPT_LSRR 131 /* loose source route */
107: #define IPOPT_SATID 136 /* satnet id */
108: #define IPOPT_SSRR 137 /* strict source route */
109:
110: /*
111: * Offsets to fields in options other than EOL and NOP.
112: */
113: #define IPOPT_OPTVAL 0 /* option ID */
114: #define IPOPT_OLEN 1 /* option length */
115: #define IPOPT_OFFSET 2 /* offset within option */
116: #define IPOPT_MINOFF 4 /* min value of above */
117:
118: /*
119: * Time stamp option structure.
120: */
121: struct ip_timestamp {
122: u_int8_t ipt_code; /* IPOPT_TS */
123: u_int8_t ipt_len; /* size of structure (variable) */
124: u_int8_t ipt_ptr; /* index of current entry */
125: u_int8_t ipt_oflwflg; /* flags, overflow counter */
126: #define IPTS_OFLW(ip) (((ipt)->ipt_oflwflg & 0xf0) >> 4)
127: #define IPTS_FLG(ip) ((ipt)->ipt_oflwflg & 0x0f)
128: union ipt_timestamp {
129: u_int32_t ipt_time[1];
130: struct ipt_ta {
131: struct in_addr ipt_addr;
132: u_int32_t ipt_time;
133: } ipt_ta[1];
134: } ipt_timestamp;
135: };
136:
137: /* flag bits for ipt_flg */
138: #define IPOPT_TS_TSONLY 0 /* timestamps only */
139: #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
140: #define IPOPT_TS_PRESPEC 3 /* specified modules only */
141:
142: /* bits for security (not byte swapped) */
143: #define IPOPT_SECUR_UNCLASS 0x0000
144: #define IPOPT_SECUR_CONFID 0xf135
145: #define IPOPT_SECUR_EFTO 0x789a
146: #define IPOPT_SECUR_MMMM 0xbc4d
147: #define IPOPT_SECUR_RESTR 0xaf13
148: #define IPOPT_SECUR_SECRET 0xd788
149: #define IPOPT_SECUR_TOPSECRET 0x6bc5
150:
151: /*
152: * Internet implementation parameters.
153: */
154: #define MAXTTL 255 /* maximum time to live (seconds) */
155: #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
156: #define IPFRAGTTL 60 /* time to live for frags, slowhz */
157: #define IPTTLDEC 1 /* subtracted when forwarding */
158:
159: #define IP_MSS 576 /* default maximum segment size */
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