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f0cbd3ec FB |
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. | |
2f5f8996 | 13 | * 3. Neither the name of the University nor the names of its contributors |
f0cbd3ec FB |
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 | ||
2a6a4076 MA |
33 | #ifndef IP_H |
34 | #define IP_H | |
f0cbd3ec | 35 | |
e429f296 MAL |
36 | #include <glib.h> |
37 | ||
38 | #if G_BYTE_ORDER == G_BIG_ENDIAN | |
9b24d8e9 AF |
39 | # undef NTOHL |
40 | # undef NTOHS | |
41 | # undef HTONL | |
42 | # undef HTONS | |
43 | # define NTOHL(d) | |
44 | # define NTOHS(d) | |
45 | # define HTONL(d) | |
46 | # define HTONS(d) | |
f0cbd3ec FB |
47 | #else |
48 | # ifndef NTOHL | |
49 | # define NTOHL(d) ((d) = ntohl((d))) | |
50 | # endif | |
51 | # ifndef NTOHS | |
b6dce92e | 52 | # define NTOHS(d) ((d) = ntohs((uint16_t)(d))) |
f0cbd3ec FB |
53 | # endif |
54 | # ifndef HTONL | |
55 | # define HTONL(d) ((d) = htonl((d))) | |
56 | # endif | |
57 | # ifndef HTONS | |
b6dce92e | 58 | # define HTONS(d) ((d) = htons((uint16_t)(d))) |
f0cbd3ec FB |
59 | # endif |
60 | #endif | |
61 | ||
b6dce92e | 62 | typedef uint32_t n_long; /* long as received from the net */ |
f0cbd3ec FB |
63 | |
64 | /* | |
65 | * Definitions for internet protocol version 4. | |
66 | * Per RFC 791, September 1981. | |
67 | */ | |
68 | #define IPVERSION 4 | |
69 | ||
70 | /* | |
71 | * Structure of an internet header, naked of options. | |
f0cbd3ec FB |
72 | */ |
73 | struct ip { | |
e429f296 | 74 | #if G_BYTE_ORDER == G_BIG_ENDIAN |
1b930bfa | 75 | uint8_t ip_v:4, /* version */ |
f0cbd3ec FB |
76 | ip_hl:4; /* header length */ |
77 | #else | |
1b930bfa | 78 | uint8_t ip_hl:4, /* header length */ |
f0cbd3ec FB |
79 | ip_v:4; /* version */ |
80 | #endif | |
b6dce92e SW |
81 | uint8_t ip_tos; /* type of service */ |
82 | uint16_t ip_len; /* total length */ | |
83 | uint16_t ip_id; /* identification */ | |
84 | uint16_t ip_off; /* fragment offset field */ | |
f0cbd3ec FB |
85 | #define IP_DF 0x4000 /* don't fragment flag */ |
86 | #define IP_MF 0x2000 /* more fragments flag */ | |
87 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ | |
b6dce92e SW |
88 | uint8_t ip_ttl; /* time to live */ |
89 | uint8_t ip_p; /* protocol */ | |
90 | uint16_t ip_sum; /* checksum */ | |
f0cbd3ec | 91 | struct in_addr ip_src,ip_dst; /* source and dest address */ |
90329416 | 92 | } SLIRP_PACKED; |
f0cbd3ec FB |
93 | |
94 | #define IP_MAXPACKET 65535 /* maximum packet size */ | |
95 | ||
96 | /* | |
97 | * Definitions for IP type of service (ip_tos) | |
98 | */ | |
99 | #define IPTOS_LOWDELAY 0x10 | |
100 | #define IPTOS_THROUGHPUT 0x08 | |
101 | #define IPTOS_RELIABILITY 0x04 | |
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 */ | |
130 | #define IPOPT_OFFSET 2 /* offset within option */ | |
131 | #define IPOPT_MINOFF 4 /* min value of above */ | |
132 | ||
133 | /* | |
134 | * Time stamp option structure. | |
135 | */ | |
136 | struct ip_timestamp { | |
b6dce92e SW |
137 | uint8_t ipt_code; /* IPOPT_TS */ |
138 | uint8_t ipt_len; /* size of structure (variable) */ | |
139 | uint8_t ipt_ptr; /* index of current entry */ | |
e429f296 | 140 | #if G_BYTE_ORDER == G_BIG_ENDIAN |
1b930bfa | 141 | uint8_t ipt_oflw:4, /* overflow counter */ |
f0cbd3ec FB |
142 | ipt_flg:4; /* flags, see below */ |
143 | #else | |
1b930bfa | 144 | uint8_t ipt_flg:4, /* flags, see below */ |
f0cbd3ec FB |
145 | ipt_oflw:4; /* overflow counter */ |
146 | #endif | |
147 | union ipt_timestamp { | |
148 | n_long ipt_time[1]; | |
149 | struct ipt_ta { | |
150 | struct in_addr ipt_addr; | |
151 | n_long ipt_time; | |
152 | } ipt_ta[1]; | |
153 | } ipt_timestamp; | |
90329416 | 154 | } SLIRP_PACKED; |
f0cbd3ec FB |
155 | |
156 | /* flag bits for ipt_flg */ | |
157 | #define IPOPT_TS_TSONLY 0 /* timestamps only */ | |
158 | #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ | |
159 | #define IPOPT_TS_PRESPEC 3 /* specified modules only */ | |
160 | ||
161 | /* bits for security (not byte swapped) */ | |
162 | #define IPOPT_SECUR_UNCLASS 0x0000 | |
163 | #define IPOPT_SECUR_CONFID 0xf135 | |
164 | #define IPOPT_SECUR_EFTO 0x789a | |
165 | #define IPOPT_SECUR_MMMM 0xbc4d | |
166 | #define IPOPT_SECUR_RESTR 0xaf13 | |
167 | #define IPOPT_SECUR_SECRET 0xd788 | |
168 | #define IPOPT_SECUR_TOPSECRET 0x6bc5 | |
169 | ||
170 | /* | |
171 | * Internet implementation parameters. | |
172 | */ | |
173 | #define MAXTTL 255 /* maximum time to live (seconds) */ | |
174 | #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ | |
175 | #define IPFRAGTTL 60 /* time to live for frags, slowhz */ | |
176 | #define IPTTLDEC 1 /* subtracted when forwarding */ | |
177 | ||
178 | #define IP_MSS 576 /* default maximum segment size */ | |
179 | ||
0826c240 | 180 | #if GLIB_SIZEOF_VOID_P == 4 |
429d0a3d BS |
181 | struct mbuf_ptr { |
182 | struct mbuf *mptr; | |
183 | uint32_t dummy; | |
90329416 | 184 | } SLIRP_PACKED; |
f0cbd3ec | 185 | #else |
429d0a3d BS |
186 | struct mbuf_ptr { |
187 | struct mbuf *mptr; | |
90329416 | 188 | } SLIRP_PACKED; |
f0cbd3ec | 189 | #endif |
429d0a3d BS |
190 | struct qlink { |
191 | void *next, *prev; | |
192 | }; | |
f0cbd3ec FB |
193 | |
194 | /* | |
195 | * Overlay for ip header used by other protocols (tcp, udp). | |
196 | */ | |
197 | struct ipovly { | |
429d0a3d | 198 | struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */ |
b6dce92e SW |
199 | uint8_t ih_x1; /* (unused) */ |
200 | uint8_t ih_pr; /* protocol */ | |
201 | uint16_t ih_len; /* protocol length */ | |
f0cbd3ec FB |
202 | struct in_addr ih_src; /* source internet address */ |
203 | struct in_addr ih_dst; /* destination internet address */ | |
90329416 | 204 | } SLIRP_PACKED; |
f0cbd3ec FB |
205 | |
206 | /* | |
207 | * Ip reassembly queue structure. Each fragment | |
208 | * being reassembled is attached to one of these structures. | |
209 | * They are timed out after ipq_ttl drops to 0, and may also | |
210 | * be reclaimed if memory becomes tight. | |
211 | * size 28 bytes | |
212 | */ | |
213 | struct ipq { | |
429d0a3d BS |
214 | struct qlink frag_link; /* to ip headers of fragments */ |
215 | struct qlink ip_link; /* to other reass headers */ | |
b6dce92e SW |
216 | uint8_t ipq_ttl; /* time for reass q to live */ |
217 | uint8_t ipq_p; /* protocol of this fragment */ | |
218 | uint16_t ipq_id; /* sequence id for reassembly */ | |
f0cbd3ec | 219 | struct in_addr ipq_src,ipq_dst; |
aaa0c642 | 220 | }; |
f0cbd3ec FB |
221 | |
222 | /* | |
223 | * Ip header, when holding a fragment. | |
224 | * | |
429d0a3d | 225 | * Note: ipf_link must be at same offset as frag_link above |
f0cbd3ec FB |
226 | */ |
227 | struct ipasfrag { | |
429d0a3d BS |
228 | struct qlink ipf_link; |
229 | struct ip ipf_ip; | |
aaa0c642 PM |
230 | }; |
231 | ||
232 | QEMU_BUILD_BUG_ON(offsetof(struct ipq, frag_link) != | |
233 | offsetof(struct ipasfrag, ipf_link)); | |
f0cbd3ec | 234 | |
429d0a3d BS |
235 | #define ipf_off ipf_ip.ip_off |
236 | #define ipf_tos ipf_ip.ip_tos | |
237 | #define ipf_len ipf_ip.ip_len | |
238 | #define ipf_next ipf_link.next | |
b6dce92e | 239 | #define ipf_prev ipf_link.prev |
429d0a3d | 240 | |
f0cbd3ec | 241 | #endif |