blob: a8cdb0d3fb273f1947c2ca0d3ee788c39ac7a121 [file] [log] [blame]
bellardf0cbd3e2004-04-22 00:10:48 +00001/*
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)ip.h 8.1 (Berkeley) 6/10/93
34 * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
35 */
36
37#ifndef _IP_H_
38#define _IP_H_
39
40#ifdef WORDS_BIGENDIAN
41# ifndef NTOHL
42# define NTOHL(d)
43# endif
44# ifndef NTOHS
45# define NTOHS(d)
46# endif
47# ifndef HTONL
48# define HTONL(d)
49# endif
50# ifndef HTONS
51# define HTONS(d)
52# endif
53#else
54# ifndef NTOHL
55# define NTOHL(d) ((d) = ntohl((d)))
56# endif
57# ifndef NTOHS
58# define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
59# endif
60# ifndef HTONL
61# define HTONL(d) ((d) = htonl((d)))
62# endif
63# ifndef HTONS
64# define HTONS(d) ((d) = htons((u_int16_t)(d)))
65# endif
66#endif
67
68typedef u_int32_t n_long; /* long as received from the net */
69
70/*
71 * Definitions for internet protocol version 4.
72 * Per RFC 791, September 1981.
73 */
74#define IPVERSION 4
75
76/*
77 * Structure of an internet header, naked of options.
bellardf0cbd3e2004-04-22 00:10:48 +000078 */
79struct ip {
80#ifdef WORDS_BIGENDIAN
81 u_int ip_v:4, /* version */
82 ip_hl:4; /* header length */
83#else
84 u_int ip_hl:4, /* header length */
85 ip_v:4; /* version */
86#endif
87 u_int8_t ip_tos; /* type of service */
bellarde5532722006-05-02 21:09:02 +000088 u_int16_t ip_len; /* total length */
bellardf0cbd3e2004-04-22 00:10:48 +000089 u_int16_t ip_id; /* identification */
bellarde5532722006-05-02 21:09:02 +000090 u_int16_t ip_off; /* fragment offset field */
bellardf0cbd3e2004-04-22 00:10:48 +000091#define IP_DF 0x4000 /* don't fragment flag */
92#define IP_MF 0x2000 /* more fragments flag */
93#define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
94 u_int8_t ip_ttl; /* time to live */
95 u_int8_t ip_p; /* protocol */
96 u_int16_t ip_sum; /* checksum */
97 struct in_addr ip_src,ip_dst; /* source and dest address */
98};
99
100#define IP_MAXPACKET 65535 /* maximum packet size */
101
102/*
103 * Definitions for IP type of service (ip_tos)
104 */
105#define IPTOS_LOWDELAY 0x10
106#define IPTOS_THROUGHPUT 0x08
107#define IPTOS_RELIABILITY 0x04
108
109/*
110 * Definitions for options.
111 */
112#define IPOPT_COPIED(o) ((o)&0x80)
113#define IPOPT_CLASS(o) ((o)&0x60)
114#define IPOPT_NUMBER(o) ((o)&0x1f)
115
116#define IPOPT_CONTROL 0x00
117#define IPOPT_RESERVED1 0x20
118#define IPOPT_DEBMEAS 0x40
119#define IPOPT_RESERVED2 0x60
120
121#define IPOPT_EOL 0 /* end of option list */
122#define IPOPT_NOP 1 /* no operation */
123
124#define IPOPT_RR 7 /* record packet route */
125#define IPOPT_TS 68 /* timestamp */
126#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
127#define IPOPT_LSRR 131 /* loose source route */
128#define IPOPT_SATID 136 /* satnet id */
129#define IPOPT_SSRR 137 /* strict source route */
130
131/*
132 * Offsets to fields in options other than EOL and NOP.
133 */
134#define IPOPT_OPTVAL 0 /* option ID */
135#define IPOPT_OLEN 1 /* option length */
136#define IPOPT_OFFSET 2 /* offset within option */
137#define IPOPT_MINOFF 4 /* min value of above */
138
139/*
140 * Time stamp option structure.
141 */
142struct ip_timestamp {
143 u_int8_t ipt_code; /* IPOPT_TS */
144 u_int8_t ipt_len; /* size of structure (variable) */
145 u_int8_t ipt_ptr; /* index of current entry */
146#ifdef WORDS_BIGENDIAN
147 u_int ipt_oflw:4, /* overflow counter */
148 ipt_flg:4; /* flags, see below */
149#else
150 u_int ipt_flg:4, /* flags, see below */
151 ipt_oflw:4; /* overflow counter */
152#endif
153 union ipt_timestamp {
154 n_long ipt_time[1];
155 struct ipt_ta {
156 struct in_addr ipt_addr;
157 n_long ipt_time;
158 } ipt_ta[1];
159 } ipt_timestamp;
160};
161
162/* flag bits for ipt_flg */
163#define IPOPT_TS_TSONLY 0 /* timestamps only */
164#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
165#define IPOPT_TS_PRESPEC 3 /* specified modules only */
166
167/* bits for security (not byte swapped) */
168#define IPOPT_SECUR_UNCLASS 0x0000
169#define IPOPT_SECUR_CONFID 0xf135
170#define IPOPT_SECUR_EFTO 0x789a
171#define IPOPT_SECUR_MMMM 0xbc4d
172#define IPOPT_SECUR_RESTR 0xaf13
173#define IPOPT_SECUR_SECRET 0xd788
174#define IPOPT_SECUR_TOPSECRET 0x6bc5
175
176/*
177 * Internet implementation parameters.
178 */
179#define MAXTTL 255 /* maximum time to live (seconds) */
180#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
181#define IPFRAGTTL 60 /* time to live for frags, slowhz */
182#define IPTTLDEC 1 /* subtracted when forwarding */
183
184#define IP_MSS 576 /* default maximum segment size */
185
186#ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */
187#include <sys/types32.h>
188#else
189#if SIZEOF_CHAR_P == 4
190typedef caddr_t caddr32_t;
191#else
192typedef u_int32_t caddr32_t;
193#endif
194#endif
195
196#if SIZEOF_CHAR_P == 4
197typedef struct ipq *ipqp_32;
198typedef struct ipasfrag *ipasfragp_32;
199#else
200typedef caddr32_t ipqp_32;
201typedef caddr32_t ipasfragp_32;
202#endif
203
204/*
205 * Overlay for ip header used by other protocols (tcp, udp).
206 */
207struct ipovly {
208 caddr32_t ih_next, ih_prev; /* for protocol sequence q's */
209 u_int8_t ih_x1; /* (unused) */
210 u_int8_t ih_pr; /* protocol */
bellarde5532722006-05-02 21:09:02 +0000211 u_int16_t ih_len; /* protocol length */
bellardf0cbd3e2004-04-22 00:10:48 +0000212 struct in_addr ih_src; /* source internet address */
213 struct in_addr ih_dst; /* destination internet address */
214};
215
216/*
217 * Ip reassembly queue structure. Each fragment
218 * being reassembled is attached to one of these structures.
219 * They are timed out after ipq_ttl drops to 0, and may also
220 * be reclaimed if memory becomes tight.
221 * size 28 bytes
222 */
223struct ipq {
224 ipqp_32 next,prev; /* to other reass headers */
225 u_int8_t ipq_ttl; /* time for reass q to live */
226 u_int8_t ipq_p; /* protocol of this fragment */
227 u_int16_t ipq_id; /* sequence id for reassembly */
228 ipasfragp_32 ipq_next,ipq_prev;
229 /* to ip headers of fragments */
230 struct in_addr ipq_src,ipq_dst;
231};
232
233/*
234 * Ip header, when holding a fragment.
235 *
236 * Note: ipf_next must be at same offset as ipq_next above
237 */
238struct ipasfrag {
239#ifdef WORDS_BIGENDIAN
240 u_int ip_v:4,
241 ip_hl:4;
242#else
243 u_int ip_hl:4,
244 ip_v:4;
245#endif
246 /* BUG : u_int changed to u_int8_t.
247 * sizeof(u_int)==4 on linux 2.0
248 */
249 u_int8_t ipf_mff; /* XXX overlays ip_tos: use low bit
250 * to avoid destroying tos (PPPDTRuu);
251 * copied from (ip_off&IP_MF) */
bellarde5532722006-05-02 21:09:02 +0000252 u_int16_t ip_len;
bellardf0cbd3e2004-04-22 00:10:48 +0000253 u_int16_t ip_id;
bellarde5532722006-05-02 21:09:02 +0000254 u_int16_t ip_off;
bellardf0cbd3e2004-04-22 00:10:48 +0000255 u_int8_t ip_ttl;
256 u_int8_t ip_p;
257 u_int16_t ip_sum;
258 ipasfragp_32 ipf_next; /* next fragment */
259 ipasfragp_32 ipf_prev; /* previous fragment */
260};
261
262/*
263 * Structure stored in mbuf in inpcb.ip_options
264 * and passed to ip_output when ip options are in use.
265 * The actual length of the options (including ipopt_dst)
266 * is in m_len.
267 */
268#define MAX_IPOPTLEN 40
269
270struct ipoption {
271 struct in_addr ipopt_dst; /* first-hop dst if source routed */
272 int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
273};
274
blueswir131a60e22007-10-26 18:42:59 +0000275#ifdef LOG_ENABLED
bellardf0cbd3e2004-04-22 00:10:48 +0000276/*
277 * Structure attached to inpcb.ip_moptions and
278 * passed to ip_output when IP multicast options are in use.
279 */
280
281struct ipstat {
282 u_long ips_total; /* total packets received */
283 u_long ips_badsum; /* checksum bad */
284 u_long ips_tooshort; /* packet too short */
285 u_long ips_toosmall; /* not enough data */
286 u_long ips_badhlen; /* ip header length < data size */
287 u_long ips_badlen; /* ip length < ip header length */
288 u_long ips_fragments; /* fragments received */
289 u_long ips_fragdropped; /* frags dropped (dups, out of space) */
290 u_long ips_fragtimeout; /* fragments timed out */
291 u_long ips_forward; /* packets forwarded */
292 u_long ips_cantforward; /* packets rcvd for unreachable dest */
293 u_long ips_redirectsent; /* packets forwarded on same net */
294 u_long ips_noproto; /* unknown or unsupported protocol */
295 u_long ips_delivered; /* datagrams delivered to upper level*/
296 u_long ips_localout; /* total ip packets generated here */
297 u_long ips_odropped; /* lost packets due to nobufs, etc. */
298 u_long ips_reassembled; /* total packets reassembled ok */
299 u_long ips_fragmented; /* datagrams successfully fragmented */
300 u_long ips_ofragments; /* output fragments created */
301 u_long ips_cantfrag; /* don't fragment flag was set, etc. */
302 u_long ips_badoptions; /* error in option processing */
303 u_long ips_noroute; /* packets discarded due to no route */
304 u_long ips_badvers; /* ip version != 4 */
305 u_long ips_rawout; /* total raw ip packets generated */
306 u_long ips_unaligned; /* times the ip packet was not aligned */
307};
308
309extern struct ipstat ipstat;
blueswir131a60e22007-10-26 18:42:59 +0000310#endif
311
bellardf0cbd3e2004-04-22 00:10:48 +0000312extern struct ipq ipq; /* ip reass. queue */
313extern u_int16_t ip_id; /* ip packet ctr, for ids */
blueswir131a60e22007-10-26 18:42:59 +0000314
bellardf0cbd3e2004-04-22 00:10:48 +0000315#endif