9pfs: fix crash when fsdev is missing
[qemu.git] / slirp / ip.h
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 # undef NTOHL
38 # undef NTOHS
39 # undef HTONL
40 # undef HTONS
41 # define NTOHL(d)
42 # define NTOHS(d)
43 # define HTONL(d)
44 # define HTONS(d)
45 #else
46 # ifndef NTOHL
47 # define NTOHL(d) ((d) = ntohl((d)))
48 # endif
49 # ifndef NTOHS
50 # define NTOHS(d) ((d) = ntohs((uint16_t)(d)))
51 # endif
52 # ifndef HTONL
53 # define HTONL(d) ((d) = htonl((d)))
54 # endif
55 # ifndef HTONS
56 # define HTONS(d) ((d) = htons((uint16_t)(d)))
57 # endif
58 #endif
59
60 typedef uint32_t n_long; /* long as received from the net */
61
62 /*
63 * Definitions for internet protocol version 4.
64 * Per RFC 791, September 1981.
65 */
66 #define IPVERSION 4
67
68 /*
69 * Structure of an internet header, naked of options.
70 */
71 struct ip {
72 #ifdef HOST_WORDS_BIGENDIAN
73 uint8_t ip_v:4, /* version */
74 ip_hl:4; /* header length */
75 #else
76 uint8_t ip_hl:4, /* header length */
77 ip_v:4; /* version */
78 #endif
79 uint8_t ip_tos; /* type of service */
80 uint16_t ip_len; /* total length */
81 uint16_t ip_id; /* identification */
82 uint16_t ip_off; /* fragment offset field */
83 #define IP_DF 0x4000 /* don't fragment flag */
84 #define IP_MF 0x2000 /* more fragments flag */
85 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
86 uint8_t ip_ttl; /* time to live */
87 uint8_t ip_p; /* protocol */
88 uint16_t ip_sum; /* checksum */
89 struct in_addr ip_src,ip_dst; /* source and dest address */
90 } QEMU_PACKED;
91
92 #define IP_MAXPACKET 65535 /* maximum packet size */
93
94 /*
95 * Definitions for IP type of service (ip_tos)
96 */
97 #define IPTOS_LOWDELAY 0x10
98 #define IPTOS_THROUGHPUT 0x08
99 #define IPTOS_RELIABILITY 0x04
100
101 /*
102 * Definitions for options.
103 */
104 #define IPOPT_COPIED(o) ((o)&0x80)
105 #define IPOPT_CLASS(o) ((o)&0x60)
106 #define IPOPT_NUMBER(o) ((o)&0x1f)
107
108 #define IPOPT_CONTROL 0x00
109 #define IPOPT_RESERVED1 0x20
110 #define IPOPT_DEBMEAS 0x40
111 #define IPOPT_RESERVED2 0x60
112
113 #define IPOPT_EOL 0 /* end of option list */
114 #define IPOPT_NOP 1 /* no operation */
115
116 #define IPOPT_RR 7 /* record packet route */
117 #define IPOPT_TS 68 /* timestamp */
118 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
119 #define IPOPT_LSRR 131 /* loose source route */
120 #define IPOPT_SATID 136 /* satnet id */
121 #define IPOPT_SSRR 137 /* strict source route */
122
123 /*
124 * Offsets to fields in options other than EOL and NOP.
125 */
126 #define IPOPT_OPTVAL 0 /* option ID */
127 #define IPOPT_OLEN 1 /* option length */
128 #define IPOPT_OFFSET 2 /* offset within option */
129 #define IPOPT_MINOFF 4 /* min value of above */
130
131 /*
132 * Time stamp option structure.
133 */
134 struct ip_timestamp {
135 uint8_t ipt_code; /* IPOPT_TS */
136 uint8_t ipt_len; /* size of structure (variable) */
137 uint8_t ipt_ptr; /* index of current entry */
138 #ifdef HOST_WORDS_BIGENDIAN
139 uint8_t ipt_oflw:4, /* overflow counter */
140 ipt_flg:4; /* flags, see below */
141 #else
142 uint8_t ipt_flg:4, /* flags, see below */
143 ipt_oflw:4; /* overflow counter */
144 #endif
145 union ipt_timestamp {
146 n_long ipt_time[1];
147 struct ipt_ta {
148 struct in_addr ipt_addr;
149 n_long ipt_time;
150 } ipt_ta[1];
151 } ipt_timestamp;
152 } QEMU_PACKED;
153
154 /* flag bits for ipt_flg */
155 #define IPOPT_TS_TSONLY 0 /* timestamps only */
156 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
157 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
158
159 /* bits for security (not byte swapped) */
160 #define IPOPT_SECUR_UNCLASS 0x0000
161 #define IPOPT_SECUR_CONFID 0xf135
162 #define IPOPT_SECUR_EFTO 0x789a
163 #define IPOPT_SECUR_MMMM 0xbc4d
164 #define IPOPT_SECUR_RESTR 0xaf13
165 #define IPOPT_SECUR_SECRET 0xd788
166 #define IPOPT_SECUR_TOPSECRET 0x6bc5
167
168 /*
169 * Internet implementation parameters.
170 */
171 #define MAXTTL 255 /* maximum time to live (seconds) */
172 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
173 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
174 #define IPTTLDEC 1 /* subtracted when forwarding */
175
176 #define IP_MSS 576 /* default maximum segment size */
177
178 #if SIZEOF_CHAR_P == 4
179 struct mbuf_ptr {
180 struct mbuf *mptr;
181 uint32_t dummy;
182 } QEMU_PACKED;
183 #else
184 struct mbuf_ptr {
185 struct mbuf *mptr;
186 } QEMU_PACKED;
187 #endif
188 struct qlink {
189 void *next, *prev;
190 };
191
192 /*
193 * Overlay for ip header used by other protocols (tcp, udp).
194 */
195 struct ipovly {
196 struct mbuf_ptr ih_mbuf; /* backpointer to mbuf */
197 uint8_t ih_x1; /* (unused) */
198 uint8_t ih_pr; /* protocol */
199 uint16_t ih_len; /* protocol length */
200 struct in_addr ih_src; /* source internet address */
201 struct in_addr ih_dst; /* destination internet address */
202 } QEMU_PACKED;
203
204 /*
205 * Ip reassembly queue structure. Each fragment
206 * being reassembled is attached to one of these structures.
207 * They are timed out after ipq_ttl drops to 0, and may also
208 * be reclaimed if memory becomes tight.
209 * size 28 bytes
210 */
211 struct ipq {
212 struct qlink frag_link; /* to ip headers of fragments */
213 struct qlink ip_link; /* to other reass headers */
214 uint8_t ipq_ttl; /* time for reass q to live */
215 uint8_t ipq_p; /* protocol of this fragment */
216 uint16_t ipq_id; /* sequence id for reassembly */
217 struct in_addr ipq_src,ipq_dst;
218 } QEMU_PACKED;
219
220 /*
221 * Ip header, when holding a fragment.
222 *
223 * Note: ipf_link must be at same offset as frag_link above
224 */
225 struct ipasfrag {
226 struct qlink ipf_link;
227 struct ip ipf_ip;
228 } QEMU_PACKED;
229
230 #define ipf_off ipf_ip.ip_off
231 #define ipf_tos ipf_ip.ip_tos
232 #define ipf_len ipf_ip.ip_len
233 #define ipf_next ipf_link.next
234 #define ipf_prev ipf_link.prev
235
236 /*
237 * Structure stored in mbuf in inpcb.ip_options
238 * and passed to ip_output when ip options are in use.
239 * The actual length of the options (including ipopt_dst)
240 * is in m_len.
241 */
242 #define MAX_IPOPTLEN 40
243
244 struct ipoption {
245 struct in_addr ipopt_dst; /* first-hop dst if source routed */
246 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
247 } QEMU_PACKED;
248
249 #endif