xref: /dragonfly/sys/sys/mbuf.h (revision 1de703da)
1 /*
2  * Copyright (c) 1982, 1986, 1988, 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  *	@(#)mbuf.h	8.5 (Berkeley) 2/19/95
34  * $FreeBSD: src/sys/sys/mbuf.h,v 1.44.2.17 2003/04/15 06:15:02 silby Exp $
35  * $DragonFly: src/sys/sys/mbuf.h,v 1.2 2003/06/17 04:28:58 dillon Exp $
36  */
37 
38 #ifndef _SYS_MBUF_H_
39 #define	_SYS_MBUF_H_
40 
41 #include <sys/queue.h>
42 
43 /*
44  * Mbufs are of a single size, MSIZE (machine/param.h), which
45  * includes overhead.  An mbuf may add a single "mbuf cluster" of size
46  * MCLBYTES (also in machine/param.h), which has no additional overhead
47  * and is used instead of the internal data area; this is done when
48  * at least MINCLSIZE of data must be stored.
49  */
50 #define	MLEN		(MSIZE - sizeof(struct m_hdr))	/* normal data len */
51 #define	MHLEN		(MLEN - sizeof(struct pkthdr))	/* data len w/pkthdr */
52 #define	MINCLSIZE	(MHLEN + 1)	/* smallest amount to put in cluster */
53 #define	M_MAXCOMPRESS	(MHLEN / 2)	/* max amount to copy for compression */
54 
55 /*
56  * Macros for type conversion:
57  * mtod(m, t)	-- Convert mbuf pointer to data pointer of correct type.
58  * dtom(x)	-- Convert data pointer within mbuf to mbuf pointer (XXX).
59  * mtocl(x) -	convert pointer within cluster to cluster index #
60  * cltom(x) -	convert cluster # to ptr to beginning of cluster
61  */
62 #define	mtod(m, t)	((t)((m)->m_data))
63 #define	dtom(x)		((struct mbuf *)((intptr_t)(x) & ~(MSIZE-1)))
64 #define	mtocl(x)	(((uintptr_t)(x) - (uintptr_t)mbutl) >> MCLSHIFT)
65 #define	cltom(x)	((caddr_t)((uintptr_t)mbutl + \
66 			    ((uintptr_t)(x) << MCLSHIFT)))
67 
68 /*
69  * Header present at the beginning of every mbuf.
70  */
71 struct m_hdr {
72 	struct	mbuf *mh_next;		/* next buffer in chain */
73 	struct	mbuf *mh_nextpkt;	/* next chain in queue/record */
74 	caddr_t	mh_data;		/* location of data */
75 	int	mh_len;			/* amount of data in this mbuf */
76 	short	mh_type;		/* type of data in this mbuf */
77 	short	mh_flags;		/* flags; see below */
78 };
79 
80 /*
81  * Packet tag structure (see below for details).
82  */
83 struct m_tag {
84 	SLIST_ENTRY(m_tag)	m_tag_link;	/* List of packet tags */
85 	u_int16_t		m_tag_id;	/* Tag ID */
86 	u_int16_t		m_tag_len;	/* Length of data */
87 	u_int32_t		m_tag_cookie;	/* ABI/Module ID */
88 };
89 
90 /*
91  * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
92  */
93 struct pkthdr {
94 	struct	ifnet *rcvif;		/* rcv interface */
95 	int	len;			/* total packet length */
96 	/* variables for ip and tcp reassembly */
97 	void	*header;		/* pointer to packet header */
98 	/* variables for hardware checksum */
99 	int	csum_flags;		/* flags regarding checksum */
100 	int	csum_data;		/* data field used by csum routines */
101 	SLIST_HEAD(packet_tags, m_tag) tags; /* list of packet tags */
102 };
103 
104 /*
105  * Description of external storage mapped into mbuf; valid only if M_EXT is set.
106  */
107 struct m_ext {
108 	caddr_t	ext_buf;		/* start of buffer */
109 	void	(*ext_free)		/* free routine if not the usual */
110 		    (caddr_t, u_int);
111 	u_int	ext_size;		/* size of buffer, for ext_free */
112 	void	(*ext_ref)		/* add a reference to the ext object */
113 		(caddr_t, u_int);
114 };
115 
116 /*
117  * The core of the mbuf object along with some shortcut defines for
118  * practical purposes.
119  */
120 struct mbuf {
121 	struct	m_hdr m_hdr;
122 	union {
123 		struct {
124 			struct	pkthdr MH_pkthdr;	/* M_PKTHDR set */
125 			union {
126 				struct	m_ext MH_ext;	/* M_EXT set */
127 				char	MH_databuf[MHLEN];
128 			} MH_dat;
129 		} MH;
130 		char	M_databuf[MLEN];		/* !M_PKTHDR, !M_EXT */
131 	} M_dat;
132 };
133 #define	m_next		m_hdr.mh_next
134 #define	m_len		m_hdr.mh_len
135 #define	m_data		m_hdr.mh_data
136 #define	m_type		m_hdr.mh_type
137 #define	m_flags		m_hdr.mh_flags
138 #define	m_nextpkt	m_hdr.mh_nextpkt
139 #define	m_act		m_nextpkt
140 #define	m_pkthdr	M_dat.MH.MH_pkthdr
141 #define	m_ext		M_dat.MH.MH_dat.MH_ext
142 #define	m_pktdat	M_dat.MH.MH_dat.MH_databuf
143 #define	m_dat		M_dat.M_databuf
144 
145 /*
146  * mbuf flags.
147  */
148 #define	M_EXT		0x0001	/* has associated external storage */
149 #define	M_PKTHDR	0x0002	/* start of record */
150 #define	M_EOR		0x0004	/* end of record */
151 #define	M_PROTO1	0x0008	/* protocol-specific */
152 #define	M_PROTO2	0x0010	/* protocol-specific */
153 #define	M_PROTO3	0x0020	/* protocol-specific */
154 #define	M_PROTO4	0x0040	/* protocol-specific */
155 #define	M_PROTO5	0x0080	/* protocol-specific */
156 
157 /*
158  * mbuf pkthdr flags (also stored in m_flags).
159  */
160 #define	M_BCAST		0x0100	/* send/received as link-level broadcast */
161 #define	M_MCAST		0x0200	/* send/received as link-level multicast */
162 #define	M_FRAG		0x0400	/* packet is a fragment of a larger packet */
163 #define	M_FIRSTFRAG	0x0800	/* packet is first fragment */
164 #define	M_LASTFRAG	0x1000	/* packet is last fragment */
165 
166 /*
167  * Flags copied when copying m_pkthdr.
168  */
169 #define	M_COPYFLAGS	(M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \
170 			    M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG | \
171 			    M_FIRSTFRAG|M_LASTFRAG)
172 
173 /*
174  * Flags indicating hw checksum support and sw checksum requirements.
175  */
176 #define	CSUM_IP			0x0001		/* will csum IP */
177 #define	CSUM_TCP		0x0002		/* will csum TCP */
178 #define	CSUM_UDP		0x0004		/* will csum UDP */
179 #define	CSUM_IP_FRAGS		0x0008		/* will csum IP fragments */
180 #define	CSUM_FRAGMENT		0x0010		/* will do IP fragmentation */
181 
182 #define	CSUM_IP_CHECKED		0x0100		/* did csum IP */
183 #define	CSUM_IP_VALID		0x0200		/*   ... the csum is valid */
184 #define	CSUM_DATA_VALID		0x0400		/* csum_data field is valid */
185 #define	CSUM_PSEUDO_HDR		0x0800		/* csum_data has pseudo hdr */
186 
187 #define	CSUM_DELAY_DATA		(CSUM_TCP | CSUM_UDP)
188 #define	CSUM_DELAY_IP		(CSUM_IP)	/* XXX add ipv6 here too? */
189 
190 /*
191  * mbuf types.
192  */
193 #define	MT_FREE		0	/* should be on free list */
194 #define	MT_DATA		1	/* dynamic (data) allocation */
195 #define	MT_HEADER	2	/* packet header */
196 #if 0
197 #define	MT_SOCKET	3	/* socket structure */
198 #define	MT_PCB		4	/* protocol control block */
199 #define	MT_RTABLE	5	/* routing tables */
200 #define	MT_HTABLE	6	/* IMP host tables */
201 #define	MT_ATABLE	7	/* address resolution tables */
202 #endif
203 #define	MT_SONAME	8	/* socket name */
204 #if 0
205 #define	MT_SOOPTS	10	/* socket options */
206 #endif
207 #define	MT_FTABLE	11	/* fragment reassembly header */
208 #if 0
209 #define	MT_RIGHTS	12	/* access rights */
210 #define	MT_IFADDR	13	/* interface address */
211 #endif
212 #define	MT_TAG		13	/* volatile metadata associated to pkts */
213 #define	MT_CONTROL	14	/* extra-data protocol message */
214 #define	MT_OOBDATA	15	/* expedited data  */
215 #define	MT_NTYPES	16	/* number of mbuf types for mbtypes[] */
216 
217 /*
218  * General mbuf allocator statistics structure.
219  */
220 struct mbstat {
221 	u_long	m_mbufs;	/* mbufs obtained from page pool */
222 	u_long	m_clusters;	/* clusters obtained from page pool */
223 	u_long	m_spare;	/* spare field */
224 	u_long	m_clfree;	/* free clusters */
225 	u_long	m_drops;	/* times failed to find space */
226 	u_long	m_wait;		/* times waited for space */
227 	u_long	m_drain;	/* times drained protocols for space */
228 	u_long	m_mcfail;	/* times m_copym failed */
229 	u_long	m_mpfail;	/* times m_pullup failed */
230 	u_long	m_msize;	/* length of an mbuf */
231 	u_long	m_mclbytes;	/* length of an mbuf cluster */
232 	u_long	m_minclsize;	/* min length of data to allocate a cluster */
233 	u_long	m_mlen;		/* length of data in an mbuf */
234 	u_long	m_mhlen;	/* length of data in a header mbuf */
235 };
236 
237 /*
238  * Flags specifying how an allocation should be made.
239  */
240 
241 #define	M_DONTWAIT	1
242 #define	M_WAIT		0
243 
244 /* Freelists:
245  *
246  * Normal mbuf clusters are normally treated as character arrays
247  * after allocation, but use the first word of the buffer as a free list
248  * pointer while on the free list.
249  */
250 union mcluster {
251 	union	mcluster *mcl_next;
252 	char	mcl_buf[MCLBYTES];
253 };
254 
255 
256 /*
257  * These are identifying numbers passed to the m_mballoc_wait function,
258  * allowing us to determine whether the call came from an MGETHDR or
259  * an MGET.
260  */
261 #define	MGETHDR_C      1
262 #define	MGET_C         2
263 
264 /*
265  * Wake up the next instance (if any) of m_mballoc_wait() which is
266  * waiting for an mbuf to be freed.  This should be called at splimp().
267  *
268  * XXX: If there is another free mbuf, this routine will be called [again]
269  * from the m_mballoc_wait routine in order to wake another sleep instance.
270  */
271 #define	MMBWAKEUP() do {						\
272 	if (m_mballoc_wid) {						\
273 		m_mballoc_wid--;					\
274 		wakeup_one(&m_mballoc_wid); 				\
275 	}								\
276 } while (0)
277 
278 /*
279  * Same as above, but for mbuf cluster(s).
280  */
281 #define	MCLWAKEUP() do {						\
282 	if (m_clalloc_wid) {						\
283 		m_clalloc_wid--;					\
284 		wakeup_one(&m_clalloc_wid);				\
285 	}								\
286 } while (0)
287 
288 /*
289  * mbuf utility macros:
290  *
291  *	MBUFLOCK(code)
292  * prevents a section of code from from being interrupted by network
293  * drivers.
294  */
295 #define	MBUFLOCK(code) do {						\
296 	int _ms = splimp();						\
297 									\
298 	{ code }							\
299 	splx(_ms);							\
300 } while (0)
301 
302 /*
303  * mbuf allocation/deallocation macros:
304  *
305  *	MGET(struct mbuf *m, int how, int type)
306  * allocates an mbuf and initializes it to contain internal data.
307  *
308  *	MGETHDR(struct mbuf *m, int how, int type)
309  * allocates an mbuf and initializes it to contain a packet header
310  * and internal data.
311  */
312 #define	MGET(m, how, type) do {						\
313 	struct mbuf *_mm;						\
314 	int _mhow = (how);						\
315 	int _mtype = (type);						\
316 	int _ms = splimp();						\
317 									\
318 	if (mmbfree == NULL)						\
319 		(void)m_mballoc(1, _mhow);				\
320 	_mm = mmbfree;							\
321 	if (_mm != NULL) {						\
322 		mmbfree = _mm->m_next;					\
323 		mbtypes[MT_FREE]--;					\
324 		_mm->m_type = _mtype;					\
325 		mbtypes[_mtype]++;					\
326 		_mm->m_next = NULL;					\
327 		_mm->m_nextpkt = NULL;					\
328 		_mm->m_data = _mm->m_dat;				\
329 		_mm->m_flags = 0;					\
330 		(m) = _mm;						\
331 		splx(_ms);						\
332 	} else {							\
333 		splx(_ms);						\
334 		_mm = m_retry(_mhow, _mtype);				\
335 		if (_mm == NULL && _mhow == M_WAIT)			\
336 			(m) = m_mballoc_wait(MGET_C, _mtype);		\
337 		else							\
338 			(m) = _mm;					\
339 	}								\
340 } while (0)
341 
342 #define	MGETHDR(m, how, type) do {					\
343 	struct mbuf *_mm;						\
344 	int _mhow = (how);						\
345 	int _mtype = (type);						\
346 	int _ms = splimp();						\
347 									\
348 	if (mmbfree == NULL)						\
349 		(void)m_mballoc(1, _mhow);				\
350 	_mm = mmbfree;							\
351 	if (_mm != NULL) {						\
352 		mmbfree = _mm->m_next;					\
353 		mbtypes[MT_FREE]--;					\
354 		_mm->m_type = _mtype;					\
355 		mbtypes[_mtype]++;					\
356 		_mm->m_next = NULL;					\
357 		_mm->m_nextpkt = NULL;					\
358 		_mm->m_data = _mm->m_pktdat;				\
359 		_mm->m_flags = M_PKTHDR;				\
360 		_mm->m_pkthdr.rcvif = NULL;				\
361 		SLIST_INIT(&_mm->m_pkthdr.tags); 			\
362 		_mm->m_pkthdr.csum_flags = 0;				\
363 		(m) = _mm;						\
364 		splx(_ms);						\
365 	} else {							\
366 		splx(_ms);						\
367 		_mm = m_retryhdr(_mhow, _mtype);			\
368 		if (_mm == NULL && _mhow == M_WAIT)			\
369 			(m) = m_mballoc_wait(MGETHDR_C, _mtype);	\
370 		else							\
371 			(m) = _mm;					\
372 	}								\
373 } while (0)
374 
375 /*
376  * Mbuf cluster macros.
377  * MCLALLOC(caddr_t p, int how) allocates an mbuf cluster.
378  * MCLGET adds such clusters to a normal mbuf;
379  * the flag M_EXT is set upon success.
380  * MCLFREE releases a reference to a cluster allocated by MCLALLOC,
381  * freeing the cluster if the reference count has reached 0.
382  */
383 #define	MCLALLOC(p, how) do {						\
384 	caddr_t _mp;							\
385 	int _mhow = (how);						\
386 	int _ms = splimp();						\
387 									\
388 	if (mclfree == NULL)						\
389 		(void)m_clalloc(1, _mhow);				\
390 	_mp = (caddr_t)mclfree;						\
391 	if (_mp != NULL) {						\
392 		mclrefcnt[mtocl(_mp)]++;				\
393 		mbstat.m_clfree--;					\
394 		mclfree = ((union mcluster *)_mp)->mcl_next;		\
395 		(p) = _mp;						\
396 		splx(_ms);						\
397 	} else {							\
398 		splx(_ms);						\
399 		if (_mhow == M_WAIT)					\
400 			(p) = m_clalloc_wait();				\
401 		else							\
402 			(p) = NULL;					\
403 	}								\
404 } while (0)
405 
406 #define	MCLGET(m, how) do {						\
407 	struct mbuf *_mm = (m);						\
408 									\
409 	MCLALLOC(_mm->m_ext.ext_buf, (how));				\
410 	if (_mm->m_ext.ext_buf != NULL) {				\
411 		_mm->m_data = _mm->m_ext.ext_buf;			\
412 		_mm->m_flags |= M_EXT;					\
413 		_mm->m_ext.ext_free = NULL;				\
414 		_mm->m_ext.ext_ref = NULL;				\
415 		_mm->m_ext.ext_size = MCLBYTES;				\
416 	}								\
417 } while (0)
418 
419 #define	MCLFREE1(p) do {						\
420 	union mcluster *_mp = (union mcluster *)(p);			\
421 									\
422 	KASSERT(mclrefcnt[mtocl(_mp)] > 0, ("freeing free cluster"));	\
423 	if (--mclrefcnt[mtocl(_mp)] == 0) {				\
424 		_mp->mcl_next = mclfree;				\
425 		mclfree = _mp;						\
426 		mbstat.m_clfree++;					\
427 		MCLWAKEUP();						\
428 	}								\
429 } while (0)
430 
431 #define	MCLFREE(p) MBUFLOCK(						\
432 	MCLFREE1(p);							\
433 )
434 
435 #define	MEXTFREE1(m) do {						\
436 		struct mbuf *_mm = (m);					\
437 									\
438 		if (_mm->m_ext.ext_free != NULL)			\
439 			(*_mm->m_ext.ext_free)(_mm->m_ext.ext_buf,	\
440 		    	    _mm->m_ext.ext_size);			\
441 		else							\
442 			MCLFREE1(_mm->m_ext.ext_buf);			\
443 } while (0)
444 
445 #define	MEXTFREE(m) MBUFLOCK(						\
446 	MEXTFREE1(m);							\
447 )
448 
449 /*
450  * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
451  *     or m_dup_pkthdr.
452  */
453 /*
454  * Move mbuf pkthdr from "from" to "to".
455  * from should have M_PKTHDR set, and to must be empty.
456  * from no longer has a pkthdr after this operation.
457  */
458 #define	M_MOVE_PKTHDR(_to, _from)	m_move_pkthdr((_to), (_from))
459 
460 /*
461  * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
462  * an object of the specified size at the end of the mbuf, longword aligned.
463  */
464 #define	M_ALIGN(m, len) do {						\
465 	(m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1);		\
466 } while (0)
467 
468 /*
469  * As above, for mbufs allocated with m_gethdr/MGETHDR
470  * or initialized by M_COPY_PKTHDR.
471  */
472 #define	MH_ALIGN(m, len) do {						\
473 	(m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1);		\
474 } while (0)
475 
476 /*
477  * Check if we can write to an mbuf.
478  */
479 #define M_EXT_WRITABLE(m)	\
480     ((m)->m_ext.ext_free == NULL && mclrefcnt[mtocl((m)->m_ext.ext_buf)] == 1)
481 
482 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || \
483     M_EXT_WRITABLE(m) )
484 
485 /*
486  * Compute the amount of space available
487  * before the current start of data in an mbuf.
488  *
489  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
490  * of checking writability of the mbuf data area rests solely with the caller.
491  */
492 #define	M_LEADINGSPACE(m)						\
493 	((m)->m_flags & M_EXT ?						\
494 	    (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0):	\
495 	    (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat :	\
496 	    (m)->m_data - (m)->m_dat)
497 
498 /*
499  * Compute the amount of space available
500  * after the end of data in an mbuf.
501  *
502  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
503  * of checking writability of the mbuf data area rests solely with the caller.
504  */
505 #define	M_TRAILINGSPACE(m)						\
506 	((m)->m_flags & M_EXT ?						\
507 	    (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size	\
508 		- ((m)->m_data + (m)->m_len) : 0) :			\
509 	    &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
510 
511 /*
512  * Arrange to prepend space of size plen to mbuf m.
513  * If a new mbuf must be allocated, how specifies whether to wait.
514  * If how is M_DONTWAIT and allocation fails, the original mbuf chain
515  * is freed and m is set to NULL.
516  */
517 #define	M_PREPEND(m, plen, how) do {					\
518 	struct mbuf **_mmp = &(m);					\
519 	struct mbuf *_mm = *_mmp;					\
520 	int _mplen = (plen);						\
521 	int __mhow = (how);						\
522 									\
523 	if (M_LEADINGSPACE(_mm) >= _mplen) {				\
524 		_mm->m_data -= _mplen;					\
525 		_mm->m_len += _mplen;					\
526 	} else								\
527 		_mm = m_prepend(_mm, _mplen, __mhow);			\
528 	if (_mm != NULL && _mm->m_flags & M_PKTHDR)			\
529 		_mm->m_pkthdr.len += _mplen;				\
530 	*_mmp = _mm;							\
531 } while (0)
532 
533 /* change mbuf to new type */
534 #define	MCHTYPE(m, t) do {						\
535 	struct mbuf *_mm = (m);						\
536 	int _mt = (t);							\
537 	int _ms = splimp();						\
538 									\
539 	mbtypes[_mm->m_type]--;						\
540 	mbtypes[_mt]++;							\
541 	splx(_ms);							\
542 	_mm->m_type = (_mt);						\
543 } while (0)
544 
545 /* Length to m_copy to copy all. */
546 #define	M_COPYALL	1000000000
547 
548 /* Compatibility with 4.3 */
549 #define	m_copy(m, o, l)	m_copym((m), (o), (l), M_DONTWAIT)
550 
551 #ifdef _KERNEL
552 extern	u_int		 m_clalloc_wid;	/* mbuf cluster wait count */
553 extern	u_int		 m_mballoc_wid;	/* mbuf wait count */
554 extern	int		 max_linkhdr;	/* largest link-level header */
555 extern	int		 max_protohdr;	/* largest protocol header */
556 extern	int		 max_hdr;	/* largest link+protocol header */
557 extern	int		 max_datalen;	/* MHLEN - max_hdr */
558 extern	struct mbstat	 mbstat;
559 extern	u_long		 mbtypes[MT_NTYPES]; /* per-type mbuf allocations */
560 extern	int		 mbuf_wait;	/* mbuf sleep time */
561 extern	struct mbuf	*mbutl;		/* virtual address of mclusters */
562 extern	char		*mclrefcnt;	/* cluster reference counts */
563 extern	union mcluster	*mclfree;
564 extern	struct mbuf	*mmbfree;
565 extern	int		 nmbclusters;
566 extern	int		 nmbufs;
567 extern	int		 nsfbufs;
568 
569 void		 m_adj(struct mbuf *, int);
570 void		 m_cat(struct mbuf *, struct mbuf *);
571 int		 m_clalloc(int, int);
572 caddr_t		 m_clalloc_wait(void);
573 void		 m_copyback(struct mbuf *, int, int, caddr_t);
574 void		 m_copydata(struct mbuf *, int, int, caddr_t);
575 struct	mbuf	*m_copym(struct mbuf *, int, int, int);
576 struct	mbuf	*m_copypacket(struct mbuf *, int);
577 struct	mbuf	*m_defrag(struct mbuf *, int);
578 struct	mbuf	*m_devget(char *, int, int, struct ifnet *,
579 		    void (*copy)(char *, caddr_t, u_int));
580 struct	mbuf	*m_dup(struct mbuf *, int);
581 int		 m_dup_pkthdr(struct mbuf *, struct mbuf *, int);
582 struct	mbuf	*m_free(struct mbuf *);
583 void		 m_freem(struct mbuf *);
584 struct	mbuf	*m_get(int, int);
585 struct  mbuf	*m_getcl(int how, short type, int flags);
586 struct	mbuf	*m_getclr(int, int);
587 struct	mbuf	*m_gethdr(int, int);
588 struct	mbuf	*m_getm(struct mbuf *, int, int, int);
589 int		 m_mballoc(int, int);
590 struct	mbuf	*m_mballoc_wait(int, int);
591 void		 m_move_pkthdr(struct mbuf *, struct mbuf *);
592 struct	mbuf	*m_prepend(struct mbuf *, int, int);
593 void		 m_print(const struct mbuf *m);
594 struct	mbuf	*m_pulldown(struct mbuf *, int, int, int *);
595 struct	mbuf	*m_pullup(struct mbuf *, int);
596 struct	mbuf	*m_retry(int, int);
597 struct	mbuf	*m_retryhdr(int, int);
598 struct	mbuf	*m_split(struct mbuf *, int, int);
599 
600 /*
601  * Packets may have annotations attached by affixing a list
602  * of "packet tags" to the pkthdr structure.  Packet tags are
603  * dynamically allocated semi-opaque data structures that have
604  * a fixed header (struct m_tag) that specifies the size of the
605  * memory block and a <cookie,type> pair that identifies it.
606  * The cookie is a 32-bit unique unsigned value used to identify
607  * a module or ABI.  By convention this value is chose as the
608  * date+time that the module is created, expressed as the number of
609  * seconds since the epoch (e.g. using date -u +'%s').  The type value
610  * is an ABI/module-specific value that identifies a particular annotation
611  * and is private to the module.  For compatibility with systems
612  * like openbsd that define packet tags w/o an ABI/module cookie,
613  * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
614  * m_tag_find compatibility shim functions and several tag types are
615  * defined below.  Users that do not require compatibility should use
616  * a private cookie value so that packet tag-related definitions
617  * can be maintained privately.
618  *
619  * Note that the packet tag returned by m_tag_allocate has the default
620  * memory alignment implemented by malloc.  To reference private data
621  * one can use a construct like:
622  *
623  *	struct m_tag *mtag = m_tag_allocate(...);
624  *	struct foo *p = (struct foo *)(mtag+1);
625  *
626  * if the alignment of struct m_tag is sufficient for referencing members
627  * of struct foo.  Otherwise it is necessary to embed struct m_tag within
628  * the private data structure to insure proper alignment; e.g.
629  *
630  *	struct foo {
631  *		struct m_tag	tag;
632  *		...
633  *	};
634  *	struct foo *p = (struct foo *) m_tag_allocate(...);
635  *	struct m_tag *mtag = &p->tag;
636  */
637 
638 #define	PACKET_TAG_NONE				0  /* Nadda */
639 
640 /* Packet tag for use with PACKET_ABI_COMPAT */
641 #define	PACKET_TAG_IPSEC_IN_DONE		1  /* IPsec applied, in */
642 #define	PACKET_TAG_IPSEC_OUT_DONE		2  /* IPsec applied, out */
643 #define	PACKET_TAG_IPSEC_IN_CRYPTO_DONE		3  /* NIC IPsec crypto done */
644 #define	PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED	4  /* NIC IPsec crypto req'ed */
645 #define	PACKET_TAG_IPSEC_IN_COULD_DO_CRYPTO	5  /* NIC notifies IPsec */
646 #define	PACKET_TAG_IPSEC_PENDING_TDB		6  /* Reminder to do IPsec */
647 #define	PACKET_TAG_BRIDGE			7  /* Bridge processing done */
648 #define	PACKET_TAG_GIF				8  /* GIF processing done */
649 #define	PACKET_TAG_GRE				9  /* GRE processing done */
650 #define	PACKET_TAG_IN_PACKET_CHECKSUM		10 /* NIC checksumming done */
651 #define	PACKET_TAG_ENCAP			11 /* Encap.  processing */
652 #define	PACKET_TAG_IPSEC_SOCKET			12 /* IPSEC socket ref */
653 #define	PACKET_TAG_IPSEC_HISTORY		13 /* IPSEC history */
654 #define	PACKET_TAG_IPV6_INPUT			14 /* IPV6 input processing */
655 
656 /*
657  * As a temporary and low impact solution to replace the even uglier
658  * approach used so far in some parts of the network stack (which relies
659  * on global variables), packet tag-like annotations are stored in MT_TAG
660  * mbufs (or lookalikes) prepended to the actual mbuf chain.
661  *
662  *	m_type	= MT_TAG
663  *	m_flags = m_tag_id
664  *	m_next	= next buffer in chain.
665  *
666  * BE VERY CAREFUL not to pass these blocks to the mbuf handling routines.
667  */
668 #define	_m_tag_id	m_hdr.mh_flags
669 
670 /* Packet tags used in the FreeBSD network stack */
671 #define	PACKET_TAG_DUMMYNET			15 /* dummynet info */
672 #define	PACKET_TAG_IPFW				16 /* ipfw classification */
673 #define	PACKET_TAG_DIVERT			17 /* divert info */
674 #define	PACKET_TAG_IPFORWARD			18 /* ipforward info */
675 
676 /* Packet tag routines */
677 struct	m_tag 	*m_tag_alloc(u_int32_t, int, int, int);
678 void		 m_tag_free(struct m_tag *);
679 void		 m_tag_prepend(struct mbuf *, struct m_tag *);
680 void		 m_tag_unlink(struct mbuf *, struct m_tag *);
681 void		 m_tag_delete(struct mbuf *, struct m_tag *);
682 void		 m_tag_delete_chain(struct mbuf *, struct m_tag *);
683 struct	m_tag	*m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
684 struct	m_tag	*m_tag_copy(struct m_tag *, int);
685 int		 m_tag_copy_chain(struct mbuf *, struct mbuf *, int);
686 void		 m_tag_init(struct mbuf *);
687 struct	m_tag	*m_tag_first(struct mbuf *);
688 struct	m_tag	*m_tag_next(struct mbuf *, struct m_tag *);
689 
690 /* these are for openbsd compatibility */
691 #define	MTAG_ABI_COMPAT		0		/* compatibility ABI */
692 
693 static __inline struct m_tag *
694 m_tag_get(int type, int length, int wait)
695 {
696 	return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
697 }
698 
699 static __inline struct m_tag *
700 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
701 {
702 	return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
703 }
704 #endif /* _KERNEL */
705 
706 #endif /* !_SYS_MBUF_H_ */
707