1 | /* SPDX-License-Identifier: BSD-3-Clause */ |
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. Neither the name of the University nor the names of its contributors |
15 | * may be used to endorse or promote products derived from this software |
16 | * without specific prior written permission. |
17 | * |
18 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
21 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
28 | * SUCH DAMAGE. |
29 | * |
30 | * @(#)ip.h 8.1 (Berkeley) 6/10/93 |
31 | * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp |
32 | */ |
33 | |
34 | #ifndef IP_H |
35 | #define IP_H |
36 | |
37 | #include <glib.h> |
38 | |
39 | #if G_BYTE_ORDER == G_BIG_ENDIAN |
40 | #undef NTOHL |
41 | #undef NTOHS |
42 | #undef HTONL |
43 | #undef HTONS |
44 | #define NTOHL(d) |
45 | #define NTOHS(d) |
46 | #define HTONL(d) |
47 | #define HTONS(d) |
48 | #else |
49 | #ifndef NTOHL |
50 | #define NTOHL(d) ((d) = ntohl((d))) |
51 | #endif |
52 | #ifndef NTOHS |
53 | #define NTOHS(d) ((d) = ntohs((uint16_t)(d))) |
54 | #endif |
55 | #ifndef HTONL |
56 | #define HTONL(d) ((d) = htonl((d))) |
57 | #endif |
58 | #ifndef HTONS |
59 | #define HTONS(d) ((d) = htons((uint16_t)(d))) |
60 | #endif |
61 | #endif |
62 | |
63 | typedef uint32_t n_long; /* long as received from the net */ |
64 | |
65 | /* |
66 | * Definitions for internet protocol version 4. |
67 | * Per RFC 791, September 1981. |
68 | */ |
69 | #define IPVERSION 4 |
70 | |
71 | /* |
72 | * Structure of an internet header, naked of options. |
73 | */ |
74 | struct ip { |
75 | #if G_BYTE_ORDER == G_BIG_ENDIAN |
76 | uint8_t ip_v : 4, /* version */ |
77 | ip_hl : 4; /* header length */ |
78 | #else |
79 | uint8_t ip_hl : 4, /* header length */ |
80 | ip_v : 4; /* version */ |
81 | #endif |
82 | uint8_t ip_tos; /* type of service */ |
83 | uint16_t ip_len; /* total length */ |
84 | uint16_t ip_id; /* identification */ |
85 | uint16_t ip_off; /* fragment offset field */ |
86 | #define IP_DF 0x4000 /* don't fragment flag */ |
87 | #define IP_MF 0x2000 /* more fragments flag */ |
88 | #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */ |
89 | uint8_t ip_ttl; /* time to live */ |
90 | uint8_t ip_p; /* protocol */ |
91 | uint16_t ip_sum; /* checksum */ |
92 | struct in_addr ip_src, ip_dst; /* source and dest address */ |
93 | } SLIRP_PACKED; |
94 | |
95 | #define IP_MAXPACKET 65535 /* maximum packet size */ |
96 | |
97 | /* |
98 | * Definitions for IP type of service (ip_tos) |
99 | */ |
100 | #define IPTOS_LOWDELAY 0x10 |
101 | #define IPTOS_THROUGHPUT 0x08 |
102 | #define IPTOS_RELIABILITY 0x04 |
103 | |
104 | /* |
105 | * Definitions for options. |
106 | */ |
107 | #define IPOPT_COPIED(o) ((o)&0x80) |
108 | #define IPOPT_CLASS(o) ((o)&0x60) |
109 | #define IPOPT_NUMBER(o) ((o)&0x1f) |
110 | |
111 | #define IPOPT_CONTROL 0x00 |
112 | #define IPOPT_RESERVED1 0x20 |
113 | #define IPOPT_DEBMEAS 0x40 |
114 | #define IPOPT_RESERVED2 0x60 |
115 | |
116 | #define IPOPT_EOL 0 /* end of option list */ |
117 | #define IPOPT_NOP 1 /* no operation */ |
118 | |
119 | #define IPOPT_RR 7 /* record packet route */ |
120 | #define IPOPT_TS 68 /* timestamp */ |
121 | #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */ |
122 | #define IPOPT_LSRR 131 /* loose source route */ |
123 | #define IPOPT_SATID 136 /* satnet id */ |
124 | #define IPOPT_SSRR 137 /* strict source route */ |
125 | |
126 | /* |
127 | * Offsets to fields in options other than EOL and NOP. |
128 | */ |
129 | #define IPOPT_OPTVAL 0 /* option ID */ |
130 | #define IPOPT_OLEN 1 /* option length */ |
131 | #define IPOPT_OFFSET 2 /* offset within option */ |
132 | #define IPOPT_MINOFF 4 /* min value of above */ |
133 | |
134 | /* |
135 | * Time stamp option structure. |
136 | */ |
137 | struct ip_timestamp { |
138 | uint8_t ipt_code; /* IPOPT_TS */ |
139 | uint8_t ipt_len; /* size of structure (variable) */ |
140 | uint8_t ipt_ptr; /* index of current entry */ |
141 | #if G_BYTE_ORDER == G_BIG_ENDIAN |
142 | uint8_t ipt_oflw : 4, /* overflow counter */ |
143 | ipt_flg : 4; /* flags, see below */ |
144 | #else |
145 | uint8_t ipt_flg : 4, /* flags, see below */ |
146 | ipt_oflw : 4; /* overflow counter */ |
147 | #endif |
148 | union ipt_timestamp { |
149 | n_long ipt_time[1]; |
150 | struct ipt_ta { |
151 | struct in_addr ipt_addr; |
152 | n_long ipt_time; |
153 | } ipt_ta[1]; |
154 | } ipt_timestamp; |
155 | } SLIRP_PACKED; |
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) */ |
175 | #define IPDEFTTL 64 /* default ttl, from RFC 1340 */ |
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 */ |
180 | |
181 | #if GLIB_SIZEOF_VOID_P == 4 |
182 | struct mbuf_ptr { |
183 | struct mbuf *mptr; |
184 | uint32_t dummy; |
185 | } SLIRP_PACKED; |
186 | #else |
187 | struct mbuf_ptr { |
188 | struct mbuf *mptr; |
189 | } SLIRP_PACKED; |
190 | #endif |
191 | struct qlink { |
192 | void *next, *prev; |
193 | }; |
194 | |
195 | /* |
196 | * Overlay for ip header used by other protocols (tcp, udp). |
197 | */ |
198 | struct ipovly { |
199 | struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */ |
200 | uint8_t ih_x1; /* (unused) */ |
201 | uint8_t ih_pr; /* protocol */ |
202 | uint16_t ih_len; /* protocol length */ |
203 | struct in_addr ih_src; /* source internet address */ |
204 | struct in_addr ih_dst; /* destination internet address */ |
205 | } SLIRP_PACKED; |
206 | |
207 | /* |
208 | * Ip reassembly queue structure. Each fragment |
209 | * being reassembled is attached to one of these structures. |
210 | * They are timed out after ipq_ttl drops to 0, and may also |
211 | * be reclaimed if memory becomes tight. |
212 | * size 28 bytes |
213 | */ |
214 | struct ipq { |
215 | struct qlink frag_link; /* to ip headers of fragments */ |
216 | struct qlink ip_link; /* to other reass headers */ |
217 | uint8_t ipq_ttl; /* time for reass q to live */ |
218 | uint8_t ipq_p; /* protocol of this fragment */ |
219 | uint16_t ipq_id; /* sequence id for reassembly */ |
220 | struct in_addr ipq_src, ipq_dst; |
221 | }; |
222 | |
223 | /* |
224 | * Ip header, when holding a fragment. |
225 | * |
226 | * Note: ipf_link must be at same offset as frag_link above |
227 | */ |
228 | struct ipasfrag { |
229 | struct qlink ipf_link; |
230 | struct ip ipf_ip; |
231 | }; |
232 | |
233 | G_STATIC_ASSERT(offsetof(struct ipq, frag_link) == |
234 | offsetof(struct ipasfrag, ipf_link)); |
235 | |
236 | #define ipf_off ipf_ip.ip_off |
237 | #define ipf_tos ipf_ip.ip_tos |
238 | #define ipf_len ipf_ip.ip_len |
239 | #define ipf_next ipf_link.next |
240 | #define ipf_prev ipf_link.prev |
241 | |
242 | #endif |
243 | |