src/slirp/ip.h

/*
 * Copyright (c) 1982, 1986, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)ip.h        8.1 (Berkeley) 6/10/93
 * ip.h,v 1.3 1994/08/21 05:27:30 paul Exp
 */

#ifndef _IP_H_
#define _IP_H_

#ifdef WORDS_BIGENDIAN
# ifndef NTOHL
#  define NTOHL(d)
# endif
# ifndef NTOHS
#  define NTOHS(d)
# endif
# ifndef HTONL
#  define HTONL(d)
# endif
# ifndef HTONS
#  define HTONS(d)
# endif
#else
# ifndef NTOHL
#  define NTOHL(d) ((d) = ntohl((d)))
# endif
# ifndef NTOHS
#  define NTOHS(d) ((d) = ntohs((u_int16_t)(d)))
# endif
# ifndef HTONL
#  define HTONL(d) ((d) = htonl((d)))
# endif
# ifndef HTONS
#  define HTONS(d) ((d) = htons((u_int16_t)(d)))
# endif
#endif

typedef u_int32_t n_long;                 /* long as received from the net */

/*
 * Definitions for internet protocol version 4.
 * Per RFC 791, September 1981.
 */
#define IPVERSION       4

/*
 * Structure of an internet header, naked of options.
 */
#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(1)
#endif

struct ip {
#ifdef WORDS_BIGENDIAN
        u_char ip_v:4,                  /* version */
                ip_hl:4;                /* header length */
#else
        u_char ip_hl:4,         /* header length */
                ip_v:4;                 /* version */
#endif
        u_int8_t ip_tos;                        /* type of service */
        u_int16_t       ip_len;                 /* total length */
        u_int16_t       ip_id;                  /* identification */
        u_int16_t       ip_off;                 /* fragment offset field */
#define IP_DF 0x4000                    /* don't fragment flag */
#define IP_MF 0x2000                    /* more fragments flag */
#define IP_OFFMASK 0x1fff               /* mask for fragmenting bits */
        u_int8_t ip_ttl;                        /* time to live */
        u_int8_t ip_p;                  /* protocol */
        u_int16_t       ip_sum;                 /* checksum */
        struct  in_addr ip_src,ip_dst;  /* source and dest address */
} PACKED__;

#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(0)
#endif

#define IP_MAXPACKET    65535           /* maximum packet size */

/*
 * Definitions for IP type of service (ip_tos)
 */
#define IPTOS_LOWDELAY          0x10
#define IPTOS_THROUGHPUT        0x08
#define IPTOS_RELIABILITY       0x04

/*
 * Definitions for options.
 */
#define IPOPT_COPIED(o)         ((o)&0x80)
#define IPOPT_CLASS(o)          ((o)&0x60)
#define IPOPT_NUMBER(o)         ((o)&0x1f)

#define IPOPT_CONTROL           0x00
#define IPOPT_RESERVED1         0x20
#define IPOPT_DEBMEAS           0x40
#define IPOPT_RESERVED2         0x60

#define IPOPT_EOL               0               /* end of option list */
#define IPOPT_NOP               1               /* no operation */

#define IPOPT_RR                7               /* record packet route */
#define IPOPT_TS                68              /* timestamp */
#define IPOPT_SECURITY          130             /* provide s,c,h,tcc */
#define IPOPT_LSRR              131             /* loose source route */
#define IPOPT_SATID             136             /* satnet id */
#define IPOPT_SSRR              137             /* strict source route */

/*
 * Offsets to fields in options other than EOL and NOP.
 */
#define IPOPT_OPTVAL            0               /* option ID */
#define IPOPT_OLEN              1               /* option length */
#define IPOPT_OFFSET            2               /* offset within option */
#define IPOPT_MINOFF            4               /* min value of above */

/*
 * Time stamp option structure.
 */
#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(1)
#endif

struct  ip_timestamp {
        u_int8_t        ipt_code;               /* IPOPT_TS */
        u_int8_t        ipt_len;                /* size of structure (variable) */
        u_int8_t        ipt_ptr;                /* index of current entry */
#ifdef WORDS_BIGENDIAN
        u_char  ipt_oflw:4,             /* overflow counter */
                ipt_flg:4;              /* flags, see below */
#else
        u_char  ipt_flg:4,              /* flags, see below */
                ipt_oflw:4;             /* overflow counter */
#endif
        union ipt_timestamp {
                n_long  ipt_time[1];
                struct  ipt_ta {
                        struct in_addr ipt_addr;
                        n_long ipt_time;
                } ipt_ta[1];
        } ipt_timestamp;
} PACKED__;

#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(0)
#endif

/* flag bits for ipt_flg */
#define IPOPT_TS_TSONLY         0               /* timestamps only */
#define IPOPT_TS_TSANDADDR      1               /* timestamps and addresses */
#define IPOPT_TS_PRESPEC        3               /* specified modules only */

/* bits for security (not byte swapped) */
#define IPOPT_SECUR_UNCLASS     0x0000
#define IPOPT_SECUR_CONFID      0xf135
#define IPOPT_SECUR_EFTO        0x789a
#define IPOPT_SECUR_MMMM        0xbc4d
#define IPOPT_SECUR_RESTR       0xaf13
#define IPOPT_SECUR_SECRET      0xd788
#define IPOPT_SECUR_TOPSECRET   0x6bc5

/*
 * Internet implementation parameters.
 */
#define MAXTTL          255             /* maximum time to live (seconds) */
#define IPDEFTTL        64              /* default ttl, from RFC 1340 */
#define IPFRAGTTL       60              /* time to live for frags, slowhz */
#define IPTTLDEC        1               /* subtracted when forwarding */

#define IP_MSS          576             /* default maximum segment size */

#ifdef HAVE_SYS_TYPES32_H  /* Overcome some Solaris 2.x junk */
#include <sys/types32.h>
#else
#if SIZEOF_CHAR_P == 4
typedef caddr_t caddr32_t;
#else
typedef u_int32_t caddr32_t;
#endif
#endif

#if SIZEOF_CHAR_P == 4
typedef struct ipq *ipqp_32;
typedef struct ipasfrag *ipasfragp_32;
#else
typedef caddr32_t ipqp_32;
typedef caddr32_t ipasfragp_32;
#endif

/*
 * Overlay for ip header used by other protocols (tcp, udp).
 */
#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(1)
#endif

struct ipovly {
        caddr32_t       ih_next, ih_prev;       /* for protocol sequence q's */
        u_int8_t        ih_x1;                  /* (unused) */
        u_int8_t        ih_pr;                  /* protocol */
        u_int16_t       ih_len;                 /* protocol length */
        struct  in_addr ih_src;         /* source internet address */
        struct  in_addr ih_dst;         /* destination internet address */
} PACKED__;

#ifdef PRAGMA_PACK_SUPPORTED
#pragma pack(0)
#endif

/*
 * Ip reassembly queue structure.  Each fragment
 * being reassembled is attached to one of these structures.
 * They are timed out after ipq_ttl drops to 0, and may also
 * be reclaimed if memory becomes tight.
 * size 28 bytes
 */
struct ipq {
        ipqp_32 next,prev;      /* to other reass headers */
        u_int8_t        ipq_ttl;                /* time for reass q to live */
        u_int8_t        ipq_p;                  /* protocol of this fragment */
        u_int16_t       ipq_id;                 /* sequence id for reassembly */
        ipasfragp_32 ipq_next,ipq_prev;
                                        /* to ip headers of fragments */
        struct  in_addr ipq_src,ipq_dst;
};

/*
 * Ip header, when holding a fragment.
 *
 * Note: ipf_next must be at same offset as ipq_next above
 */
struct  ipasfrag {
#ifdef WORDS_BIGENDIAN
        u_char  ip_v:4,
                ip_hl:4;
#else
        u_char  ip_hl:4,
                ip_v:4;
#endif
                                        /* BUG : u_int changed to u_int8_t.
                                         * sizeof(u_int)==4 on linux 2.0
                                         */
        u_int8_t ipf_mff;               /* XXX overlays ip_tos: use low bit
                                         * to avoid destroying tos (PPPDTRuu);
                                         * copied from (ip_off&IP_MF) */
        u_int16_t       ip_len;
        u_int16_t       ip_id;
        u_int16_t       ip_off;
        u_int8_t        ip_ttl;
        u_int8_t        ip_p;
        u_int16_t       ip_sum;
        ipasfragp_32 ipf_next;          /* next fragment */
        ipasfragp_32 ipf_prev;          /* previous fragment */
};

/*
 * Structure stored in mbuf in inpcb.ip_options
 * and passed to ip_output when ip options are in use.
 * The actual length of the options (including ipopt_dst)
 * is in m_len.
 */
#define MAX_IPOPTLEN    40

struct ipoption {
        struct  in_addr ipopt_dst;      /* first-hop dst if source routed */
        int8_t  ipopt_list[MAX_IPOPTLEN];       /* options proper */
};

/*
 * Structure attached to inpcb.ip_moptions and
 * passed to ip_output when IP multicast options are in use.
 */

struct  ipstat {
        u_long  ips_total;              /* total packets received */
        u_long  ips_badsum;             /* checksum bad */
        u_long  ips_tooshort;           /* packet too short */
        u_long  ips_toosmall;           /* not enough data */
        u_long  ips_badhlen;            /* ip header length < data size */
        u_long  ips_badlen;             /* ip length < ip header length */
        u_long  ips_fragments;          /* fragments received */
        u_long  ips_fragdropped;        /* frags dropped (dups, out of space) */
        u_long  ips_fragtimeout;        /* fragments timed out */
        u_long  ips_forward;            /* packets forwarded */
        u_long  ips_cantforward;        /* packets rcvd for unreachable dest */
        u_long  ips_redirectsent;       /* packets forwarded on same net */
        u_long  ips_noproto;            /* unknown or unsupported protocol */
        u_long  ips_delivered;          /* datagrams delivered to upper level*/
        u_long  ips_localout;           /* total ip packets generated here */
        u_long  ips_odropped;           /* lost packets due to nobufs, etc. */
        u_long  ips_reassembled;        /* total packets reassembled ok */
        u_long  ips_fragmented;         /* datagrams successfully fragmented */
        u_long  ips_ofragments;         /* output fragments created */
        u_long  ips_cantfrag;           /* don't fragment flag was set, etc. */
        u_long  ips_badoptions;         /* error in option processing */
        u_long  ips_noroute;            /* packets discarded due to no route */
        u_long  ips_badvers;            /* ip version != 4 */
        u_long  ips_rawout;             /* total raw ip packets generated */
        u_long  ips_unaligned;          /* times the ip packet was not aligned */
};

extern struct   ipstat  ipstat;
extern struct   ipq     ipq;                    /* ip reass. queue */
extern u_int16_t        ip_id;                          /* ip packet ctr, for ids */
extern int      ip_defttl;                      /* default IP ttl */

#endif
Revision:	1.4
Committed:	2007-11-03T11:11:42Z (17 years ago) by gbeauche
Content type:	text/plain
Branch:	MAIN
Changes since 1.3:	+5 -9 lines
Log Message:	Update to slirp sources from QEMU 0.8.2: - set slirp client hostname - fix slirp redirection on systems without a useful host IP address - separate alias_addr (10.0.2.2) from our_addr (Ed Swierk) - fix 32+ KB packets handling (Ed Swierk) - fix UDP broadcast translation error - solaris port (Ben Taylor)
#	User	Rev	Content
1	gbeauche	1.1	/*
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. 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
68			typedef 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.
78			*/
79	gbeauche	1.2	#ifdef PRAGMA_PACK_SUPPORTED
80			#pragma pack(1)
81			#endif
82
83	gbeauche	1.1	struct ip {
84			#ifdef WORDS_BIGENDIAN
85	gbeauche	1.3	u_char ip_v:4, /* version */
86	gbeauche	1.1	ip_hl:4; /* header length */
87			#else
88	gbeauche	1.3	u_char ip_hl:4, /* header length */
89	gbeauche	1.1	ip_v:4; /* version */
90			#endif
91			u_int8_t ip_tos; /* type of service */
92	gbeauche	1.4	u_int16_t ip_len; /* total length */
93	gbeauche	1.1	u_int16_t ip_id; /* identification */
94	gbeauche	1.4	u_int16_t ip_off; /* fragment offset field */
95	gbeauche	1.1	#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 */
102	gbeauche	1.2	} PACKED__;
103
104			#ifdef PRAGMA_PACK_SUPPORTED
105			#pragma pack(0)
106			#endif
107	gbeauche	1.1
108			#define IP_MAXPACKET 65535 /* maximum packet size */
109
110			/*
111			* Definitions for IP type of service (ip_tos)
112			*/
113			#define IPTOS_LOWDELAY 0x10
114			#define IPTOS_THROUGHPUT 0x08
115			#define IPTOS_RELIABILITY 0x04
116
117			/*
118			* Definitions for options.
119			*/
120			#define IPOPT_COPIED(o) ((o)&0x80)
121			#define IPOPT_CLASS(o) ((o)&0x60)
122			#define IPOPT_NUMBER(o) ((o)&0x1f)
123
124			#define IPOPT_CONTROL 0x00
125			#define IPOPT_RESERVED1 0x20
126			#define IPOPT_DEBMEAS 0x40
127			#define IPOPT_RESERVED2 0x60
128
129			#define IPOPT_EOL 0 /* end of option list */
130			#define IPOPT_NOP 1 /* no operation */
131
132			#define IPOPT_RR 7 /* record packet route */
133			#define IPOPT_TS 68 /* timestamp */
134			#define IPOPT_SECURITY 130 /* provide s,c,h,tcc */
135			#define IPOPT_LSRR 131 /* loose source route */
136			#define IPOPT_SATID 136 /* satnet id */
137			#define IPOPT_SSRR 137 /* strict source route */
138
139			/*
140			* Offsets to fields in options other than EOL and NOP.
141			*/
142			#define IPOPT_OPTVAL 0 /* option ID */
143			#define IPOPT_OLEN 1 /* option length */
144			#define IPOPT_OFFSET 2 /* offset within option */
145			#define IPOPT_MINOFF 4 /* min value of above */
146
147			/*
148			* Time stamp option structure.
149			*/
150	gbeauche	1.2	#ifdef PRAGMA_PACK_SUPPORTED
151			#pragma pack(1)
152			#endif
153
154	gbeauche	1.1	struct ip_timestamp {
155			u_int8_t ipt_code; /* IPOPT_TS */
156			u_int8_t ipt_len; /* size of structure (variable) */
157			u_int8_t ipt_ptr; /* index of current entry */
158			#ifdef WORDS_BIGENDIAN
159	gbeauche	1.3	u_char ipt_oflw:4, /* overflow counter */
160	gbeauche	1.1	ipt_flg:4; /* flags, see below */
161			#else
162	gbeauche	1.3	u_char ipt_flg:4, /* flags, see below */
163	gbeauche	1.1	ipt_oflw:4; /* overflow counter */
164			#endif
165			union ipt_timestamp {
166			n_long ipt_time[1];
167			struct ipt_ta {
168			struct in_addr ipt_addr;
169			n_long ipt_time;
170			} ipt_ta[1];
171			} ipt_timestamp;
172	gbeauche	1.2	} PACKED__;
173
174			#ifdef PRAGMA_PACK_SUPPORTED
175			#pragma pack(0)
176			#endif
177	gbeauche	1.1
178			/* flag bits for ipt_flg */
179			#define IPOPT_TS_TSONLY 0 /* timestamps only */
180			#define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */
181			#define IPOPT_TS_PRESPEC 3 /* specified modules only */
182
183			/* bits for security (not byte swapped) */
184			#define IPOPT_SECUR_UNCLASS 0x0000
185			#define IPOPT_SECUR_CONFID 0xf135
186			#define IPOPT_SECUR_EFTO 0x789a
187			#define IPOPT_SECUR_MMMM 0xbc4d
188			#define IPOPT_SECUR_RESTR 0xaf13
189			#define IPOPT_SECUR_SECRET 0xd788
190			#define IPOPT_SECUR_TOPSECRET 0x6bc5
191
192			/*
193			* Internet implementation parameters.
194			*/
195			#define MAXTTL 255 /* maximum time to live (seconds) */
196			#define IPDEFTTL 64 /* default ttl, from RFC 1340 */
197			#define IPFRAGTTL 60 /* time to live for frags, slowhz */
198			#define IPTTLDEC 1 /* subtracted when forwarding */
199
200			#define IP_MSS 576 /* default maximum segment size */
201
202			#ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */
203			#include <sys/types32.h>
204			#else
205			#if SIZEOF_CHAR_P == 4
206			typedef caddr_t caddr32_t;
207			#else
208			typedef u_int32_t caddr32_t;
209			#endif
210			#endif
211
212			#if SIZEOF_CHAR_P == 4
213			typedef struct ipq *ipqp_32;
214			typedef struct ipasfrag *ipasfragp_32;
215			#else
216			typedef caddr32_t ipqp_32;
217			typedef caddr32_t ipasfragp_32;
218			#endif
219
220			/*
221			* Overlay for ip header used by other protocols (tcp, udp).
222			*/
223	gbeauche	1.2	#ifdef PRAGMA_PACK_SUPPORTED
224			#pragma pack(1)
225			#endif
226
227	gbeauche	1.1	struct ipovly {
228			caddr32_t ih_next, ih_prev; /* for protocol sequence q's */
229			u_int8_t ih_x1; /* (unused) */
230			u_int8_t ih_pr; /* protocol */
231	gbeauche	1.4	u_int16_t ih_len; /* protocol length */
232	gbeauche	1.1	struct in_addr ih_src; /* source internet address */
233			struct in_addr ih_dst; /* destination internet address */
234	gbeauche	1.2	} PACKED__;
235
236			#ifdef PRAGMA_PACK_SUPPORTED
237			#pragma pack(0)
238			#endif
239	gbeauche	1.1
240			/*
241			* Ip reassembly queue structure. Each fragment
242			* being reassembled is attached to one of these structures.
243			* They are timed out after ipq_ttl drops to 0, and may also
244			* be reclaimed if memory becomes tight.
245			* size 28 bytes
246			*/
247			struct ipq {
248			ipqp_32 next,prev; /* to other reass headers */
249			u_int8_t ipq_ttl; /* time for reass q to live */
250			u_int8_t ipq_p; /* protocol of this fragment */
251			u_int16_t ipq_id; /* sequence id for reassembly */
252			ipasfragp_32 ipq_next,ipq_prev;
253			/* to ip headers of fragments */
254			struct in_addr ipq_src,ipq_dst;
255			};
256
257			/*
258			* Ip header, when holding a fragment.
259			*
260			* Note: ipf_next must be at same offset as ipq_next above
261			*/
262			struct ipasfrag {
263			#ifdef WORDS_BIGENDIAN
264	gbeauche	1.3	u_char ip_v:4,
265	gbeauche	1.1	ip_hl:4;
266			#else
267	gbeauche	1.3	u_char ip_hl:4,
268	gbeauche	1.1	ip_v:4;
269			#endif
270			/* BUG : u_int changed to u_int8_t.
271			* sizeof(u_int)==4 on linux 2.0
272			*/
273			u_int8_t ipf_mff; /* XXX overlays ip_tos: use low bit
274			* to avoid destroying tos (PPPDTRuu);
275			* copied from (ip_off&IP_MF) */
276	gbeauche	1.4	u_int16_t ip_len;
277	gbeauche	1.1	u_int16_t ip_id;
278	gbeauche	1.4	u_int16_t ip_off;
279	gbeauche	1.1	u_int8_t ip_ttl;
280			u_int8_t ip_p;
281			u_int16_t ip_sum;
282			ipasfragp_32 ipf_next; /* next fragment */
283			ipasfragp_32 ipf_prev; /* previous fragment */
284			};
285
286			/*
287			* Structure stored in mbuf in inpcb.ip_options
288			* and passed to ip_output when ip options are in use.
289			* The actual length of the options (including ipopt_dst)
290			* is in m_len.
291			*/
292			#define MAX_IPOPTLEN 40
293
294			struct ipoption {
295			struct in_addr ipopt_dst; /* first-hop dst if source routed */
296			int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
297			};
298
299			/*
300			* Structure attached to inpcb.ip_moptions and
301			* passed to ip_output when IP multicast options are in use.
302			*/
303
304			struct ipstat {
305			u_long ips_total; /* total packets received */
306			u_long ips_badsum; /* checksum bad */
307			u_long ips_tooshort; /* packet too short */
308			u_long ips_toosmall; /* not enough data */
309			u_long ips_badhlen; /* ip header length < data size */
310			u_long ips_badlen; /* ip length < ip header length */
311			u_long ips_fragments; /* fragments received */
312			u_long ips_fragdropped; /* frags dropped (dups, out of space) */
313			u_long ips_fragtimeout; /* fragments timed out */
314			u_long ips_forward; /* packets forwarded */
315			u_long ips_cantforward; /* packets rcvd for unreachable dest */
316			u_long ips_redirectsent; /* packets forwarded on same net */
317			u_long ips_noproto; /* unknown or unsupported protocol */
318			u_long ips_delivered; /* datagrams delivered to upper level*/
319			u_long ips_localout; /* total ip packets generated here */
320			u_long ips_odropped; /* lost packets due to nobufs, etc. */
321			u_long ips_reassembled; /* total packets reassembled ok */
322			u_long ips_fragmented; /* datagrams successfully fragmented */
323			u_long ips_ofragments; /* output fragments created */
324			u_long ips_cantfrag; /* don't fragment flag was set, etc. */
325			u_long ips_badoptions; /* error in option processing */
326			u_long ips_noroute; /* packets discarded due to no route */
327			u_long ips_badvers; /* ip version != 4 */
328			u_long ips_rawout; /* total raw ip packets generated */
329			u_long ips_unaligned; /* times the ip packet was not aligned */
330			};
331
332			extern struct ipstat ipstat;
333			extern struct ipq ipq; /* ip reass. queue */
334			extern u_int16_t ip_id; /* ip packet ctr, for ids */
335			extern int ip_defttl; /* default IP ttl */
336
337			#endif