[qemu.git] / 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.
 *
 * We declare ip_len and ip_off to be short, rather than u_short
 * pragmatically since otherwise unsigned comparisons can result
 * against negative integers quite easily, and fail in subtle ways.
 */
struct ip {
#ifdef WORDS_BIGENDIAN
	u_int ip_v:4,			/* version */
		ip_hl:4;		/* header length */
#else
	u_int ip_hl:4,		/* header length */
		ip_v:4;			/* version */
#endif
	u_int8_t ip_tos;			/* type of service */
	int16_t	ip_len;			/* total length */
	u_int16_t	ip_id;			/* identification */
	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 */
};

#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.
 */
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_int	ipt_oflw:4,		/* overflow counter */
		ipt_flg:4;		/* flags, see below */
#else
	u_int	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;
};

/* 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).
 */
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 */
	int16_t	ih_len;			/* protocol length */
	struct	in_addr ih_src;		/* source internet address */
	struct	in_addr ih_dst;		/* destination internet address */
};

/*
 * 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_int	ip_v:4,
 		ip_hl:4;
#else
	u_int	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) */
	int16_t	ip_len;
	u_int16_t	ip_id;
	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
Commit	Line	Data
f0cbd3ec FB	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	* 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.
82	*/
83	struct ip {
84	#ifdef WORDS_BIGENDIAN
85	u_int ip_v:4, /* version */
86	ip_hl:4; /* header length */
87	#else
88	u_int ip_hl:4, /* header length */
89	ip_v:4; /* version */
90	#endif
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 */
102	};
103
104	#define IP_MAXPACKET 65535 /* maximum packet size */
105
106	/*
107	* Definitions for IP type of service (ip_tos)
108	*/
109	#define IPTOS_LOWDELAY 0x10
110	#define IPTOS_THROUGHPUT 0x08
111	#define IPTOS_RELIABILITY 0x04
112
113	/*
114	* Definitions for options.
115	*/
116	#define IPOPT_COPIED(o) ((o)&0x80)
117	#define IPOPT_CLASS(o) ((o)&0x60)
118	#define IPOPT_NUMBER(o) ((o)&0x1f)
119
120	#define IPOPT_CONTROL 0x00
121	#define IPOPT_RESERVED1 0x20
122	#define IPOPT_DEBMEAS 0x40
123	#define IPOPT_RESERVED2 0x60
124
125	#define IPOPT_EOL 0 /* end of option list */
126	#define IPOPT_NOP 1 /* no operation */
127
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 */
134
135	/*
136	* Offsets to fields in options other than EOL and NOP.
137	*/
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 */
142
143	/*
144	* Time stamp option structure.
145	*/
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	#ifdef WORDS_BIGENDIAN
151	u_int ipt_oflw:4, /* overflow counter */
152	ipt_flg:4; /* flags, see below */
153	#else
154	u_int ipt_flg:4, /* flags, see below */
155	ipt_oflw:4; /* overflow counter */
156	#endif
157	union ipt_timestamp {
158	n_long ipt_time[1];
159	struct ipt_ta {
160	struct in_addr ipt_addr;
161	n_long ipt_time;
162	} ipt_ta[1];
163	} ipt_timestamp;
164	};
165
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 */
170
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
179
180	/*
181	* Internet implementation parameters.
182	*/
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 */
187
188	#define IP_MSS 576 /* default maximum segment size */
189
190	#ifdef HAVE_SYS_TYPES32_H /* Overcome some Solaris 2.x junk */
191	#include <sys/types32.h>
192	#else
193	#if SIZEOF_CHAR_P == 4
194	typedef caddr_t caddr32_t;
195	#else
196	typedef u_int32_t caddr32_t;
197	#endif
198	#endif
199
200	#if SIZEOF_CHAR_P == 4
201	typedef struct ipq *ipqp_32;
202	typedef struct ipasfrag *ipasfragp_32;
203	#else
204	typedef caddr32_t ipqp_32;
205	typedef caddr32_t ipasfragp_32;
206	#endif
207
208	/*
209	* Overlay for ip header used by other protocols (tcp, udp).
210	*/
211	struct ipovly {
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 */
218	};
219
220	/*
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.
225	* size 28 bytes
226	*/
227	struct ipq {
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;
235	};
236
237	/*
238	* Ip header, when holding a fragment.
239	*
240	* Note: ipf_next must be at same offset as ipq_next above
241	*/
242	struct ipasfrag {
243	#ifdef WORDS_BIGENDIAN
244	u_int ip_v:4,
245	ip_hl:4;
246	#else
247	u_int ip_hl:4,
248	ip_v:4;
249	#endif
250	/* BUG : u_int changed to u_int8_t.
251	* sizeof(u_int)==4 on linux 2.0
252	*/
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) */
256	int16_t ip_len;
257	u_int16_t ip_id;
258	int16_t ip_off;
259	u_int8_t ip_ttl;
260	u_int8_t ip_p;
261	u_int16_t ip_sum;
262	ipasfragp_32 ipf_next; /* next fragment */
263	ipasfragp_32 ipf_prev; /* previous fragment */
264	};
265
266	/*
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)
270	* is in m_len.
271	*/
272	#define MAX_IPOPTLEN 40
273
274	struct ipoption {
275	struct in_addr ipopt_dst; /* first-hop dst if source routed */
276	int8_t ipopt_list[MAX_IPOPTLEN]; /* options proper */
277	};
278
279	/*
280	* Structure attached to inpcb.ip_moptions and
281	* passed to ip_output when IP multicast options are in use.
282	*/
283
284	struct ipstat {
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 */
310	};
311
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 */
316
317	#endif