2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * @(#)ip.h 8.1 (Berkeley) 6/10/93
34 * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
40 #if __BYTE_ORDER == __BIG_ENDIAN
55 # define NTOHL(d) ((d) = ntohl((d)))
58 # define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
61 # define HTONL(d) ((d) = htonl((d)))
64 # define HTONS(d) ((d) = htons((u_int16_t)(d)))
68 typedef u_int32_t n_long
; /* long as received from the net */
71 * Definitions for internet protocol version 4.
72 * Per RFC 791, September 1981.
77 * Structure of an internet header, naked of options.
79 * We declare ip_len and ip_off to be short, rather than u_short
80 * pragmatically since otherwise unsigned comparisons can result
81 * against negative integers quite easily, and fail in subtle ways.
84 #if __BYTE_ORDER == __BIG_ENDIAN
85 u_int ip_v
:4, /* version */
86 ip_hl
:4; /* header length */
88 u_int ip_hl
:4, /* header length */
91 u_int8_t ip_tos
; /* type of service */
92 int16_t ip_len
; /* total length */
93 u_int16_t ip_id
; /* identification */
94 int16_t ip_off
; /* fragment offset field */
95 #define IP_DF 0x4000 /* don't fragment flag */
96 #define IP_MF 0x2000 /* more fragments flag */
97 #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
98 u_int8_t ip_ttl
; /* time to live */
99 u_int8_t ip_p
; /* protocol */
100 u_int16_t ip_sum
; /* checksum */
101 struct in_addr ip_src
,ip_dst
; /* source and dest address */
104 #define IP_MAXPACKET 65535 /* maximum packet size */
107 * Definitions for IP type of service (ip_tos)
109 #define IPTOS_LOWDELAY 0x10
110 #define IPTOS_THROUGHPUT 0x08
111 #define IPTOS_RELIABILITY 0x04
114 * Definitions for options.
116 #define IPOPT_COPIED(o) ((o)&0x80)
117 #define IPOPT_CLASS(o) ((o)&0x60)
118 #define IPOPT_NUMBER(o) ((o)&0x1f)
120 #define IPOPT_CONTROL 0x00
121 #define IPOPT_RESERVED1 0x20
122 #define IPOPT_DEBMEAS 0x40
123 #define IPOPT_RESERVED2 0x60
125 #define IPOPT_EOL 0 /* end of option list */
126 #define IPOPT_NOP 1 /* no operation */
128 #define IPOPT_RR 7 /* record packet route */
129 #define IPOPT_TS 68 /* timestamp */
130 #define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
131 #define IPOPT_LSRR 131 /* loose source route */
132 #define IPOPT_SATID 136 /* satnet id */
133 #define IPOPT_SSRR 137 /* strict source route */
136 * Offsets to fields in options other than EOL and NOP.
138 #define IPOPT_OPTVAL 0 /* option ID */
139 #define IPOPT_OLEN 1 /* option length */
140 #define IPOPT_OFFSET 2 /* offset within option */
141 #define IPOPT_MINOFF 4 /* min value of above */
144 * Time stamp option structure.
146 struct ip_timestamp
{
147 u_int8_t ipt_code
; /* IPOPT_TS */
148 u_int8_t ipt_len
; /* size of structure (variable) */
149 u_int8_t ipt_ptr
; /* index of current entry */
150 #if __BYTE_ORDER == __BIG_ENDIAN
151 u_int ipt_oflw
:4, /* overflow counter */
152 ipt_flg
:4; /* flags, see below */
154 u_int ipt_flg
:4, /* flags, see below */
155 ipt_oflw
:4; /* overflow counter */
157 union ipt_timestamp
{
160 struct in_addr ipt_addr
;
166 /* flag bits for ipt_flg */
167 #define IPOPT_TS_TSONLY 0 /* timestamps only */
168 #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
169 #define IPOPT_TS_PRESPEC 3 /* specified modules only */
171 /* bits for security (not byte swapped) */
172 #define IPOPT_SECUR_UNCLASS 0x0000
173 #define IPOPT_SECUR_CONFID 0xf135
174 #define IPOPT_SECUR_EFTO 0x789a
175 #define IPOPT_SECUR_MMMM 0xbc4d
176 #define IPOPT_SECUR_RESTR 0xaf13
177 #define IPOPT_SECUR_SECRET 0xd788
178 #define IPOPT_SECUR_TOPSECRET 0x6bc5
181 * Internet implementation parameters.
183 #define MAXTTL 255 /* maximum time to live (seconds) */
184 #define IPDEFTTL 64 /* default ttl, from RFC 1340 */
185 #define IPFRAGTTL 60 /* time to live for frags, slowhz */
186 #define IPTTLDEC 1 /* subtracted when forwarding */
188 #define IP_MSS 576 /* default maximum segment size */
190 #ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */
191 #include <sys/types32.h>
193 #if SIZEOF_CHAR_P == 4
194 typedef caddr_t caddr32_t
;
196 typedef u_int32_t caddr32_t
;
200 #if SIZEOF_CHAR_P == 4
201 typedef struct ipq
*ipqp_32
;
202 typedef struct ipasfrag
*ipasfragp_32
;
204 typedef caddr32_t ipqp_32
;
205 typedef caddr32_t ipasfragp_32
;
209 * Overlay for ip header used by other protocols (tcp, udp).
212 caddr32_t ih_next
, ih_prev
; /* for protocol sequence q's */
213 u_int8_t ih_x1
; /* (unused) */
214 u_int8_t ih_pr
; /* protocol */
215 int16_t ih_len
; /* protocol length */
216 struct in_addr ih_src
; /* source internet address */
217 struct in_addr ih_dst
; /* destination internet address */
221 * Ip reassembly queue structure. Each fragment
222 * being reassembled is attached to one of these structures.
223 * They are timed out after ipq_ttl drops to 0, and may also
224 * be reclaimed if memory becomes tight.
228 ipqp_32 next
,prev
; /* to other reass headers */
229 u_int8_t ipq_ttl
; /* time for reass q to live */
230 u_int8_t ipq_p
; /* protocol of this fragment */
231 u_int16_t ipq_id
; /* sequence id for reassembly */
232 ipasfragp_32 ipq_next
,ipq_prev
;
233 /* to ip headers of fragments */
234 struct in_addr ipq_src
,ipq_dst
;
238 * Ip header, when holding a fragment.
240 * Note: ipf_next must be at same offset as ipq_next above
243 #if __BYTE_ORDER == __BIG_ENDIAN
250 /* BUG : u_int changed to u_int8_t.
251 * sizeof(u_int)==4 on linux 2.0
253 u_int8_t ipf_mff
; /* XXX overlays ip_tos: use low bit
254 * to avoid destroying tos (PPPDTRuu);
255 * copied from (ip_off&IP_MF) */
262 ipasfragp_32 ipf_next
; /* next fragment */
263 ipasfragp_32 ipf_prev
; /* previous fragment */
267 * Structure stored in mbuf in inpcb.ip_options
268 * and passed to ip_output when ip options are in use.
269 * The actual length of the options (including ipopt_dst)
272 #define MAX_IPOPTLEN 40
275 struct in_addr ipopt_dst
; /* first-hop dst if source routed */
276 int8_t ipopt_list
[MAX_IPOPTLEN
]; /* options proper */
280 * Structure attached to inpcb.ip_moptions and
281 * passed to ip_output when IP multicast options are in use.
285 u_long ips_total
; /* total packets received */
286 u_long ips_badsum
; /* checksum bad */
287 u_long ips_tooshort
; /* packet too short */
288 u_long ips_toosmall
; /* not enough data */
289 u_long ips_badhlen
; /* ip header length < data size */
290 u_long ips_badlen
; /* ip length < ip header length */
291 u_long ips_fragments
; /* fragments received */
292 u_long ips_fragdropped
; /* frags dropped (dups, out of space) */
293 u_long ips_fragtimeout
; /* fragments timed out */
294 u_long ips_forward
; /* packets forwarded */
295 u_long ips_cantforward
; /* packets rcvd for unreachable dest */
296 u_long ips_redirectsent
; /* packets forwarded on same net */
297 u_long ips_noproto
; /* unknown or unsupported protocol */
298 u_long ips_delivered
; /* datagrams delivered to upper level*/
299 u_long ips_localout
; /* total ip packets generated here */
300 u_long ips_odropped
; /* lost packets due to nobufs, etc. */
301 u_long ips_reassembled
; /* total packets reassembled ok */
302 u_long ips_fragmented
; /* datagrams successfully fragmented */
303 u_long ips_ofragments
; /* output fragments created */
304 u_long ips_cantfrag
; /* don't fragment flag was set, etc. */
305 u_long ips_badoptions
; /* error in option processing */
306 u_long ips_noroute
; /* packets discarded due to no route */
307 u_long ips_badvers
; /* ip version != 4 */
308 u_long ips_rawout
; /* total raw ip packets generated */
309 u_long ips_unaligned
; /* times the ip packet was not aligned */
312 extern struct ipstat ipstat
;
313 extern struct ipq ipq
; /* ip reass. queue */
314 extern u_int16_t ip_id
; /* ip packet ctr, for ids */
315 extern int ip_defttl
; /* default IP ttl */