root / slirp / ip.h @ 64e58fe5
History | View | Annotate | Download (7.2 kB)
1 |
/*
|
---|---|
2 |
* Copyright (c) 1982, 1986, 1993
|
3 |
* The Regents of the University of California. All rights reserved.
|
4 |
*
|
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.
|
16 |
*
|
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.
|
28 |
*
|
29 |
* @(#)ip.h 8.1 (Berkeley) 6/10/93
|
30 |
* ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
|
31 |
*/
|
32 |
|
33 |
#ifndef _IP_H_
|
34 |
#define _IP_H_
|
35 |
|
36 |
#ifdef HOST_WORDS_BIGENDIAN
|
37 |
# ifndef NTOHL
|
38 |
# define NTOHL(d)
|
39 |
# endif
|
40 |
# ifndef NTOHS
|
41 |
# define NTOHS(d)
|
42 |
# endif
|
43 |
# ifndef HTONL
|
44 |
# define HTONL(d)
|
45 |
# endif
|
46 |
# ifndef HTONS
|
47 |
# define HTONS(d)
|
48 |
# endif
|
49 |
#else
|
50 |
# ifndef NTOHL
|
51 |
# define NTOHL(d) ((d) = ntohl((d)))
|
52 |
# endif
|
53 |
# ifndef NTOHS
|
54 |
# define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
|
55 |
# endif
|
56 |
# ifndef HTONL
|
57 |
# define HTONL(d) ((d) = htonl((d)))
|
58 |
# endif
|
59 |
# ifndef HTONS
|
60 |
# define HTONS(d) ((d) = htons((u_int16_t)(d)))
|
61 |
# endif
|
62 |
#endif
|
63 |
|
64 |
typedef u_int32_t n_long; /* long as received from the net */ |
65 |
|
66 |
/*
|
67 |
* Definitions for internet protocol version 4.
|
68 |
* Per RFC 791, September 1981.
|
69 |
*/
|
70 |
#define IPVERSION 4 |
71 |
|
72 |
/*
|
73 |
* Structure of an internet header, naked of options.
|
74 |
*/
|
75 |
struct ip {
|
76 |
#ifdef HOST_WORDS_BIGENDIAN
|
77 |
u_int ip_v:4, /* version */ |
78 |
ip_hl:4; /* header length */ |
79 |
#else
|
80 |
u_int ip_hl:4, /* header length */ |
81 |
ip_v:4; /* version */ |
82 |
#endif
|
83 |
u_int8_t ip_tos; /* type of service */
|
84 |
u_int16_t ip_len; /* total length */
|
85 |
u_int16_t ip_id; /* identification */
|
86 |
u_int16_t ip_off; /* fragment offset field */
|
87 |
#define IP_DF 0x4000 /* don't fragment flag */ |
88 |
#define IP_MF 0x2000 /* more fragments flag */ |
89 |
#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ |
90 |
u_int8_t ip_ttl; /* time to live */
|
91 |
u_int8_t ip_p; /* protocol */
|
92 |
u_int16_t ip_sum; /* checksum */
|
93 |
struct in_addr ip_src,ip_dst; /* source and dest address */ |
94 |
}; |
95 |
|
96 |
#define IP_MAXPACKET 65535 /* maximum packet size */ |
97 |
|
98 |
/*
|
99 |
* Definitions for IP type of service (ip_tos)
|
100 |
*/
|
101 |
#define IPTOS_LOWDELAY 0x10 |
102 |
#define IPTOS_THROUGHPUT 0x08 |
103 |
#define IPTOS_RELIABILITY 0x04 |
104 |
|
105 |
/*
|
106 |
* Definitions for options.
|
107 |
*/
|
108 |
#define IPOPT_COPIED(o) ((o)&0x80) |
109 |
#define IPOPT_CLASS(o) ((o)&0x60) |
110 |
#define IPOPT_NUMBER(o) ((o)&0x1f) |
111 |
|
112 |
#define IPOPT_CONTROL 0x00 |
113 |
#define IPOPT_RESERVED1 0x20 |
114 |
#define IPOPT_DEBMEAS 0x40 |
115 |
#define IPOPT_RESERVED2 0x60 |
116 |
|
117 |
#define IPOPT_EOL 0 /* end of option list */ |
118 |
#define IPOPT_NOP 1 /* no operation */ |
119 |
|
120 |
#define IPOPT_RR 7 /* record packet route */ |
121 |
#define IPOPT_TS 68 /* timestamp */ |
122 |
#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
123 |
#define IPOPT_LSRR 131 /* loose source route */ |
124 |
#define IPOPT_SATID 136 /* satnet id */ |
125 |
#define IPOPT_SSRR 137 /* strict source route */ |
126 |
|
127 |
/*
|
128 |
* Offsets to fields in options other than EOL and NOP.
|
129 |
*/
|
130 |
#define IPOPT_OPTVAL 0 /* option ID */ |
131 |
#define IPOPT_OLEN 1 /* option length */ |
132 |
#define IPOPT_OFFSET 2 /* offset within option */ |
133 |
#define IPOPT_MINOFF 4 /* min value of above */ |
134 |
|
135 |
/*
|
136 |
* Time stamp option structure.
|
137 |
*/
|
138 |
struct ip_timestamp {
|
139 |
u_int8_t ipt_code; /* IPOPT_TS */
|
140 |
u_int8_t ipt_len; /* size of structure (variable) */
|
141 |
u_int8_t ipt_ptr; /* index of current entry */
|
142 |
#ifdef HOST_WORDS_BIGENDIAN
|
143 |
u_int ipt_oflw:4, /* overflow counter */ |
144 |
ipt_flg:4; /* flags, see below */ |
145 |
#else
|
146 |
u_int ipt_flg:4, /* flags, see below */ |
147 |
ipt_oflw:4; /* overflow counter */ |
148 |
#endif
|
149 |
union ipt_timestamp {
|
150 |
n_long ipt_time[1];
|
151 |
struct ipt_ta {
|
152 |
struct in_addr ipt_addr;
|
153 |
n_long ipt_time; |
154 |
} ipt_ta[1];
|
155 |
} ipt_timestamp; |
156 |
}; |
157 |
|
158 |
/* flag bits for ipt_flg */
|
159 |
#define IPOPT_TS_TSONLY 0 /* timestamps only */ |
160 |
#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ |
161 |
#define IPOPT_TS_PRESPEC 3 /* specified modules only */ |
162 |
|
163 |
/* bits for security (not byte swapped) */
|
164 |
#define IPOPT_SECUR_UNCLASS 0x0000 |
165 |
#define IPOPT_SECUR_CONFID 0xf135 |
166 |
#define IPOPT_SECUR_EFTO 0x789a |
167 |
#define IPOPT_SECUR_MMMM 0xbc4d |
168 |
#define IPOPT_SECUR_RESTR 0xaf13 |
169 |
#define IPOPT_SECUR_SECRET 0xd788 |
170 |
#define IPOPT_SECUR_TOPSECRET 0x6bc5 |
171 |
|
172 |
/*
|
173 |
* Internet implementation parameters.
|
174 |
*/
|
175 |
#define MAXTTL 255 /* maximum time to live (seconds) */ |
176 |
#define IPDEFTTL 64 /* default ttl, from RFC 1340 */ |
177 |
#define IPFRAGTTL 60 /* time to live for frags, slowhz */ |
178 |
#define IPTTLDEC 1 /* subtracted when forwarding */ |
179 |
|
180 |
#define IP_MSS 576 /* default maximum segment size */ |
181 |
|
182 |
#if SIZEOF_CHAR_P == 4 |
183 |
struct mbuf_ptr {
|
184 |
struct mbuf *mptr;
|
185 |
uint32_t dummy; |
186 |
}; |
187 |
#else
|
188 |
struct mbuf_ptr {
|
189 |
struct mbuf *mptr;
|
190 |
}; |
191 |
#endif
|
192 |
struct qlink {
|
193 |
void *next, *prev;
|
194 |
}; |
195 |
|
196 |
/*
|
197 |
* Overlay for ip header used by other protocols (tcp, udp).
|
198 |
*/
|
199 |
struct ipovly {
|
200 |
struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */ |
201 |
u_int8_t ih_x1; /* (unused) */
|
202 |
u_int8_t ih_pr; /* protocol */
|
203 |
u_int16_t ih_len; /* protocol length */
|
204 |
struct in_addr ih_src; /* source internet address */ |
205 |
struct in_addr ih_dst; /* destination internet address */ |
206 |
} __attribute__((packed)); |
207 |
|
208 |
/*
|
209 |
* Ip reassembly queue structure. Each fragment
|
210 |
* being reassembled is attached to one of these structures.
|
211 |
* They are timed out after ipq_ttl drops to 0, and may also
|
212 |
* be reclaimed if memory becomes tight.
|
213 |
* size 28 bytes
|
214 |
*/
|
215 |
struct ipq {
|
216 |
struct qlink frag_link; /* to ip headers of fragments */ |
217 |
struct qlink ip_link; /* to other reass headers */ |
218 |
u_int8_t ipq_ttl; /* time for reass q to live */
|
219 |
u_int8_t ipq_p; /* protocol of this fragment */
|
220 |
u_int16_t ipq_id; /* sequence id for reassembly */
|
221 |
struct in_addr ipq_src,ipq_dst;
|
222 |
}; |
223 |
|
224 |
/*
|
225 |
* Ip header, when holding a fragment.
|
226 |
*
|
227 |
* Note: ipf_link must be at same offset as frag_link above
|
228 |
*/
|
229 |
struct ipasfrag {
|
230 |
struct qlink ipf_link;
|
231 |
struct ip ipf_ip;
|
232 |
}; |
233 |
|
234 |
#define ipf_off ipf_ip.ip_off
|
235 |
#define ipf_tos ipf_ip.ip_tos
|
236 |
#define ipf_len ipf_ip.ip_len
|
237 |
#define ipf_next ipf_link.next
|
238 |
#define ipf_prev ipf_link.prev
|
239 |
|
240 |
/*
|
241 |
* Structure stored in mbuf in inpcb.ip_options
|
242 |
* and passed to ip_output when ip options are in use.
|
243 |
* The actual length of the options (including ipopt_dst)
|
244 |
* is in m_len.
|
245 |
*/
|
246 |
#define MAX_IPOPTLEN 40 |
247 |
|
248 |
struct ipoption {
|
249 |
struct in_addr ipopt_dst; /* first-hop dst if source routed */ |
250 |
int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
|
251 |
}; |
252 |
|
253 |
#endif
|