xref: /dragonfly/sys/sys/mbuf.h (revision 78478697)
1 /*
2  * Copyright (c) 2004 The DragonFly Project.  All rights reserved.
3  *
4  * Copyright (c) 1982, 1986, 1988, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *	This product includes software developed by the University of
18  *	California, Berkeley and its contributors.
19  * 4. Neither the name of the University nor the names of its contributors
20  *    may be used to endorse or promote products derived from this software
21  *    without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  *
35  *	@(#)mbuf.h	8.5 (Berkeley) 2/19/95
36  * $FreeBSD: src/sys/sys/mbuf.h,v 1.44.2.17 2003/04/15 06:15:02 silby Exp $
37  */
38 
39 #ifndef _SYS_MBUF_H_
40 #define	_SYS_MBUF_H_
41 
42 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
43 
44 #ifndef _SYS_TYPES_H_
45 #include <sys/types.h>
46 #endif
47 #ifndef _SYS_PARAM_H_
48 #include <sys/param.h>
49 #endif
50 #ifndef _SYS_QUEUE_H_
51 #include <sys/queue.h>
52 #endif
53 #ifndef _NET_NETISR_H_
54 #include <net/netisr.h>
55 #endif
56 #ifndef _NET_ETHERNET_H_
57 #include <net/ethernet.h>
58 #endif
59 
60 /*
61  * Mbufs are of a single size, MSIZE (machine/param.h), which
62  * includes overhead.  An mbuf may add a single "mbuf cluster" of size
63  * MCLBYTES (also in machine/param.h), which has no additional overhead
64  * and is used instead of the internal data area; this is done when
65  * at least MINCLSIZE of data must be stored.
66  */
67 #define	MLEN		(MSIZE - sizeof(struct m_hdr))	/* normal data len */
68 #define	MHLEN		(MLEN - sizeof(struct pkthdr))	/* data len w/pkthdr */
69 #define	MINCLSIZE	(MHLEN + 1)	/* smallest amount to put in cluster */
70 #define	M_MAXCOMPRESS	(MHLEN / 2)	/* max amount to copy for compression */
71 
72 /*
73  * Macros for type conversion:
74  * mtod(m, t)		-- Convert mbuf pointer to data pointer of correct type.
75  * mtodoff(m, t, off)	-- Convert mbuf pointer at the specified offset to data
76  *			   pointer of correct type.
77  */
78 #define	mtod(m, t)		((t)((m)->m_data))
79 #define	mtodoff(m, t, off)	((t)((m)->m_data + (off)))
80 
81 /*
82  * Header present at the beginning of every mbuf.
83  */
84 struct m_hdr {
85 	struct	mbuf *mh_next;		/* next buffer in chain */
86 	struct	mbuf *mh_nextpkt;	/* next chain in queue/record */
87 	caddr_t	mh_data;		/* location of data */
88 	int	mh_len;			/* amount of data in this mbuf */
89 	int	mh_flags;		/* flags; see below */
90 	short	mh_type;		/* type of data in this mbuf */
91 	short	mh_pad;			/* padding */
92 	/* XXX implicit 4 bytes padding on x86_64 */
93 #ifdef MBUF_DEBUG
94 	const char *mh_lastfunc;
95 #endif
96 	union {
97 		struct netmsg_packet mhm_pkt;	/* hardware->proto stack msg */
98 		struct netmsg_pru_send mhm_snd;	/* usrspace->proto stack msg */
99 		struct netmsg_inarp mhm_arp;	/* proto stack arpinput msg */
100 		struct netmsg_ctlinput mhm_ctl;	/* proto stack ctlinput msg */
101 	} mh_msgu;
102 };
103 #define mh_netmsg	mh_msgu.mhm_pkt
104 #define mh_sndmsg	mh_msgu.mhm_snd
105 #define mh_arpmsg	mh_msgu.mhm_arp
106 #define mh_ctlmsg	mh_msgu.mhm_ctl
107 
108 /* pf stuff */
109 struct pkthdr_pf {
110 	void		*hdr;		/* saved hdr pos in mbuf, for ECN */
111 	void		*statekey;	/* pf stackside statekey */
112 	u_int		rtableid;	/* alternate routing table id */
113 	uint32_t	qid;		/* queue id */
114 	uint16_t	tag;		/* tag id */
115 	uint8_t		flags;
116 	uint8_t		routed;
117 	uint32_t	state_hash;	/* identifies 'connections' */
118 	uint8_t		ecn_af;		/* for altq_red */
119 	uint8_t		unused01;
120 	uint8_t		unused02;
121 	uint8_t		unused03;
122 	/* XXX implicit 4 bytes padding on x86_64 */
123 };
124 
125 /* pkthdr_pf.flags */
126 #define	PF_TAG_GENERATED		0x01
127 #define	PF_TAG_FRAGCACHE		0x02
128 #define	PF_TAG_TRANSLATE_LOCALHOST	0x04
129 #define	PF_TAG_DIVERTED			0x08
130 #define	PF_TAG_DIVERTED_PACKET		0x10
131 #define	PF_TAG_REROUTE			0x20
132 
133 /*
134  * Packet tag structure (see below for details).
135  */
136 struct m_tag {
137 	SLIST_ENTRY(m_tag)	m_tag_link;	/* List of packet tags */
138 	uint16_t		m_tag_id;	/* Tag ID */
139 	uint16_t		m_tag_len;	/* Length of data */
140 	uint32_t		m_tag_cookie;	/* ABI/Module ID */
141 };
142 
143 SLIST_HEAD(packet_tags, m_tag);
144 
145 /*
146  * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
147  *
148  * Be careful: The fields have been carefully ordered to avoid hidden padding.
149  *             Keep this in mind, when adding or removing fields!
150  */
151 struct pkthdr {
152 	struct	ifnet *rcvif;		/* rcv interface */
153 	struct packet_tags tags;	/* list of packet tags */
154 
155 	/* variables for ip and tcp reassembly */
156 	void	*header;		/* pointer to packet header */
157 	int	len;			/* total packet length */
158 
159 	/* variables for hardware checksum */
160 	int	csum_flags;		/* flags regarding checksum */
161 	int	csum_data;		/* data field used by csum routines */
162 	uint16_t csum_iphlen;		/* IP header length */
163 					/* valid if CSUM IP|UDP|TCP|TSO */
164 	uint8_t	csum_thlen;		/* TCP/UDP header length */
165 					/* valid if CSUM UDP|TCP|TSO */
166 	uint8_t	csum_lhlen;		/* link header length */
167 
168 	uint16_t tso_segsz;		/* TSO segment size */
169 	uint16_t ether_vlantag;		/* ethernet 802.1p+q vlan tag */
170 
171 	uint16_t hash;			/* packet hash */
172 	uint16_t unused1;		/* reserved for route table id */
173 	uint32_t unused2;		/* reserved for codel timestamp */
174 
175 	uint16_t wlan_seqno;		/* IEEE 802.11 seq no. */
176 	/*
177 	 * Valid if BRIDGE_MBUF_TAGGED is set in fw_flags, records
178 	 * the original ether source address (if compatible).
179 	 */
180 	uint8_t ether_br_shost[ETHER_ADDR_LEN];
181 
182 	/* firewall flags */
183 	uint32_t fw_flags;		/* flags for FW */
184 
185 	/* variables for PF processing */
186 	struct pkthdr_pf pf;		/* structure for PF */
187 };
188 
189 /*
190  * Description of external storage mapped into mbuf; valid only if M_EXT is set.
191  */
192 struct m_ext {
193 	caddr_t	ext_buf;		/* start of buffer */
194 	void	(*ext_free)(void *);
195 	u_int	ext_size;		/* size of buffer, for ext_free */
196 	void	(*ext_ref)(void *);
197 	void	*ext_arg;
198 };
199 
200 /*
201  * The core of the mbuf object along with some shortcut defines for
202  * practical purposes.
203  */
204 struct mbuf {
205 	struct	m_hdr m_hdr;
206 	union {
207 		struct {
208 			struct	pkthdr MH_pkthdr;	/* M_PKTHDR set */
209 			union {
210 				struct	m_ext MH_ext;	/* M_EXT set */
211 				char	MH_databuf[MHLEN];
212 			} MH_dat;
213 		} MH;
214 		char	M_databuf[MLEN];		/* !M_PKTHDR, !M_EXT */
215 	} M_dat;
216 };
217 #define	m_next		m_hdr.mh_next
218 #define	m_len		m_hdr.mh_len
219 #define	m_data		m_hdr.mh_data
220 #define	m_type		m_hdr.mh_type
221 #define	m_flags		m_hdr.mh_flags
222 #define	m_nextpkt	m_hdr.mh_nextpkt
223 #define	m_pkthdr	M_dat.MH.MH_pkthdr
224 #define	m_ext		M_dat.MH.MH_dat.MH_ext
225 #define	m_pktdat	M_dat.MH.MH_dat.MH_databuf
226 #define	m_dat		M_dat.M_databuf
227 
228 /*
229  * Code that uses m_act should be converted to use m_nextpkt
230  * instead; m_act is historical and deprecated.
231  */
232 #define m_act   	m_nextpkt
233 
234 /*
235  * mbuf flags.
236  */
237 #define	M_EXT		0x0001	/* has associated external storage */
238 #define	M_PKTHDR	0x0002	/* start of record */
239 #define	M_EOR		0x0004	/* end of record */
240 #define	M_PROTO1	0x0008	/* protocol-specific */
241 #define	M_PROTO2	0x0010	/* protocol-specific */
242 #define	M_PROTO3	0x0020	/* protocol-specific */
243 #define	M_PROTO4	0x0040	/* protocol-specific */
244 #define	M_PROTO5	0x0080	/* protocol-specific */
245 
246 /*
247  * mbuf pkthdr flags (also stored in m_flags).
248  */
249 #define	M_BCAST		0x0100	/* send/received as link-level broadcast */
250 #define	M_MCAST		0x0200	/* send/received as link-level multicast */
251 #define	M_FRAG		0x0400	/* packet is a fragment of a larger packet */
252 #define	M_FIRSTFRAG	0x0800	/* packet is first fragment */
253 #define	M_LASTFRAG	0x1000	/* packet is last fragment */
254 #define	M_CLCACHE	0x2000	/* mbuf allocated from the cluster cache */
255 #define M_EXT_CLUSTER	0x4000	/* standard cluster else special */
256 #define	M_PHCACHE	0x8000	/* mbuf allocated from the pkt header cache */
257 #define M_UNUSED16	0x10000	/* was: notification event (SCTP) */
258 #define M_VLANTAG	0x20000	/* ether_vlantag is valid */
259 #define M_MPLSLABELED	0x40000	/* packet is mpls labeled */
260 #define M_LENCHECKED	0x80000	/* packet proto lengths are checked */
261 #define M_HASH		0x100000/* hash field in pkthdr is valid */
262 #define M_PROTO6        0x200000/* protocol-specific */
263 #define M_PROTO7        0x400000/* protocol-specific */
264 #define M_PROTO8        0x800000/* protocol-specific */
265 #define M_CKHASH	0x1000000/* hash needs software verification */
266 #define M_PRIO		0x2000000/* high priority mbuf */
267 #define M_SOLOCKED	0x4000000/* locked by userland for read() */
268 
269 /*
270  * Flags copied when copying m_pkthdr.
271  */
272 #define	M_COPYFLAGS	(M_PKTHDR|M_EOR|M_PROTO1|M_PROTO2|M_PROTO3 | \
273 			 M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8 | \
274 			 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \
275 			 M_VLANTAG|M_MPLSLABELED | \
276 			 M_LENCHECKED|M_HASH|M_CKHASH|M_PRIO)
277 
278 /*
279  * Flags indicating hw checksum support and sw checksum requirements.
280  */
281 #define	CSUM_IP			0x0001		/* will csum IP */
282 #define	CSUM_TCP		0x0002		/* will csum TCP */
283 #define	CSUM_UDP		0x0004		/* will csum UDP */
284 #define	CSUM_IP_FRAGS		0x0008		/* will csum IP fragments */
285 #define	CSUM_FRAGMENT		0x0010		/* will do IP fragmentation */
286 
287 #define	CSUM_IP_CHECKED		0x0100		/* did csum IP */
288 #define	CSUM_IP_VALID		0x0200		/*   ... the csum is valid */
289 #define	CSUM_DATA_VALID		0x0400		/* csum_data field is valid */
290 #define	CSUM_PSEUDO_HDR		0x0800		/* csum_data has pseudo hdr */
291 #define CSUM_FRAG_NOT_CHECKED	0x1000		/* did _not_ csum fragment
292 						 * NB: This flag is only used
293 						 * by IP defragmenter.
294 						 */
295 #define CSUM_TSO		0x2000		/* will do TCP segmentation */
296 
297 #define	CSUM_DELAY_DATA		(CSUM_TCP | CSUM_UDP)
298 #define	CSUM_DELAY_IP		(CSUM_IP)	/* XXX add ipv6 here too? */
299 
300 /*
301  * Flags indicating PF processing status
302  */
303 #define FW_MBUF_GENERATED	0x00000001
304 #define	PF_MBUF_STRUCTURE	0x00000002	/* m_pkthdr.pf valid */
305 #define	PF_MBUF_ROUTED		0x00000004	/* pf_routed field is valid */
306 #define	PF_MBUF_TAGGED		0x00000008
307 #define	XX_MBUF_UNUSED10	0x00000010
308 #define	XX_MBUF_UNUSED20	0x00000020
309 #define IPFORWARD_MBUF_TAGGED	0x00000040
310 #define DUMMYNET_MBUF_TAGGED	0x00000080
311 #define BRIDGE_MBUF_TAGGED	0x00000100
312 #define FW_MBUF_REDISPATCH	0x00000200
313 #define	IPFW_MBUF_GENERATED	FW_MBUF_GENERATED
314 /*
315  * mbuf types.
316  */
317 #define	MT_FREE		0	/* should be on free list */
318 #define	MT_DATA		1	/* dynamic (data) allocation */
319 #define	MT_HEADER	2	/* packet header */
320 #define	MT_SONAME	3	/* socket name */
321 /* 4 was MT_TAG */
322 #define	MT_CONTROL	5	/* extra-data protocol message */
323 #define	MT_OOBDATA	6	/* expedited data  */
324 #define	MT_NTYPES	7	/* number of mbuf types for mbtypes[] */
325 
326 /*
327  * General mbuf allocator statistics structure.
328  *
329  * NOTE: Make sure this struct's size is multiple cache line size.
330  */
331 struct mbstat {
332 	u_long	m_mbufs;	/* mbufs obtained from page pool */
333 	u_long	m_clusters;	/* clusters obtained from page pool */
334 	u_long	m_jclusters;	/* jclusters obtained from page pool */
335 	u_long	m_clfree;	/* free clusters */
336 	u_long	m_drops;	/* times failed to find space */
337 	u_long	m_wait;		/* times waited for space */
338 	u_long	m_drain;	/* times drained protocols for space */
339 	u_long	m_mcfail;	/* times m_copym failed */
340 	u_long	m_mpfail;	/* times m_pullup failed */
341 	u_long	m_msize;	/* length of an mbuf */
342 	u_long	m_mclbytes;	/* length of an mbuf cluster */
343 	u_long	m_mjumpagesize;	/* length of a jumbo mbuf cluster */
344 	u_long	m_minclsize;	/* min length of data to allocate a cluster */
345 	u_long	m_mlen;		/* length of data in an mbuf */
346 	u_long	m_mhlen;	/* length of data in a header mbuf */
347 	u_long	m_pad;		/* pad to cache line size (64B) */
348 };
349 
350 /*
351  * objcache(9) ocflags sanitizing
352  */
353 #define	MB_OCFLAG(how)	((how) & M_WAITOK ? M_WAITOK : M_NOWAIT)
354 
355 /*
356  * These are identifying numbers passed to the m_mballoc_wait function,
357  * allowing us to determine whether the call came from an MGETHDR or
358  * an MGET.
359  */
360 #define	MGETHDR_C      1
361 #define	MGET_C         2
362 
363 /*
364  * mbuf allocation/deallocation macros (YYY deprecated, too big):
365  *
366  *	MGET(struct mbuf *m, int how, int type)
367  * allocates an mbuf and initializes it to contain internal data.
368  *
369  *	MGETHDR(struct mbuf *m, int how, int type)
370  * allocates an mbuf and initializes it to contain a packet header
371  * and internal data.
372  */
373 #define	MGET(m, how, type) do {						\
374 	(m) = m_get((how), (type));					\
375 } while (0)
376 
377 #define	MGETHDR(m, how, type) do {					\
378 	(m) = m_gethdr((how), (type));					\
379 } while (0)
380 
381 /*
382  * MCLGET adds such clusters to a normal mbuf.  The flag M_EXT is set upon
383  * success.
384  * Deprecated.  Use m_getcl() or m_getl() instead.
385  */
386 #define	MCLGET(m, how) do {						\
387 	m_mclget((m), (how));						\
388 } while (0)
389 
390 /*
391  * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
392  *     or m_dup_pkthdr.
393  */
394 /*
395  * Move mbuf pkthdr from "from" to "to".
396  * from should have M_PKTHDR set, and to must be empty.
397  * from no longer has a pkthdr after this operation.
398  */
399 #define	M_MOVE_PKTHDR(_to, _from)	m_move_pkthdr((_to), (_from))
400 
401 /*
402  * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
403  * an object of the specified size at the end of the mbuf, longword aligned.
404  */
405 #define	M_ALIGN(m, len) do {						\
406 	(m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1);		\
407 } while (0)
408 
409 /*
410  * As above, for mbufs allocated with m_gethdr/MGETHDR
411  * or initialized by M_COPY_PKTHDR.
412  */
413 #define	MH_ALIGN(m, len) do {						\
414 	(m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1);		\
415 } while (0)
416 
417 /*
418  * Check if we can write to an mbuf.
419  */
420 #define M_EXT_WRITABLE(m)	(m_sharecount(m) == 1)
421 #define M_WRITABLE(m)		(!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
422 
423 /*
424  * Check if the supplied mbuf has a packet header, or else panic.
425  */
426 #define	M_ASSERTPKTHDR(m)						\
427 	KASSERT(m != NULL && m->m_flags & M_PKTHDR,			\
428 		("%s: invalid mbuf or no mbuf packet header!", __func__))
429 
430 /*
431  * Compute the amount of space available before the current start of data.
432  * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
433  * of checking writability of the mbuf data area rests solely with the caller.
434  */
435 #define	M_LEADINGSPACE(m)						\
436 	((m)->m_flags & M_EXT ?						\
437 	    (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0):	\
438 	    (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat :	\
439 	    (m)->m_data - (m)->m_dat)
440 
441 /*
442  * Compute the amount of space available after the end of data in an mbuf.
443  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
444  * of checking writability of the mbuf data area rests solely with the caller.
445  */
446 #define	M_TRAILINGSPACE(m)						\
447 	((m)->m_flags & M_EXT ?						\
448 	    (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size	\
449 		- ((m)->m_data + (m)->m_len) : 0) :			\
450 	    &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
451 
452 /*
453  * Arrange to prepend space of size plen to mbuf m.
454  * If a new mbuf must be allocated, how specifies whether to wait.
455  * If how is M_NOWAIT and allocation fails, the original mbuf chain
456  * is freed and m is set to NULL.
457  */
458 #define	M_PREPEND(m, plen, how) do {					\
459 	struct mbuf **_mmp = &(m);					\
460 	struct mbuf *_mm = *_mmp;					\
461 	int _mplen = (plen);						\
462 	int __mhow = (how);						\
463 									\
464 	if (M_LEADINGSPACE(_mm) >= _mplen) {				\
465 		_mm->m_data -= _mplen;					\
466 		_mm->m_len += _mplen;					\
467 	} else								\
468 		_mm = m_prepend(_mm, _mplen, __mhow);			\
469 	if (_mm != NULL && (_mm->m_flags & M_PKTHDR))			\
470 		_mm->m_pkthdr.len += _mplen;				\
471 	*_mmp = _mm;							\
472 } while (0)
473 
474 /* Length to m_copy to copy all. */
475 #define	M_COPYALL	1000000000
476 
477 /* Compatibility with 4.3 */
478 #define	m_copy(m, o, l)	m_copym((m), (o), (l), M_NOWAIT)
479 
480 #ifdef _KERNEL
481 extern	u_int		 m_clalloc_wid;	/* mbuf cluster wait count */
482 extern	u_int		 m_mballoc_wid;	/* mbuf wait count */
483 extern	int		 max_linkhdr;	/* largest link-level header */
484 extern	int		 max_protohdr;	/* largest protocol header */
485 extern	int		 max_hdr;	/* largest link+protocol header */
486 extern	int		 max_datalen;	/* MHLEN - max_hdr */
487 extern	int		 mbuf_wait;	/* mbuf sleep time */
488 extern	int		 nmbclusters;
489 extern	int		 nmbufs;
490 
491 struct uio;
492 
493 void		 mcl_inclimit(int);
494 void		 mjcl_inclimit(int);
495 void		 mb_inclimit(int);
496 void		 m_adj(struct mbuf *, int);
497 void		 m_align(struct mbuf *, int);
498 int		 m_apply(struct mbuf *, int, int,
499 		    int (*)(void *, void *, u_int), void *);
500 int		m_append(struct mbuf *, int, c_caddr_t);
501 void		 m_cat(struct mbuf *, struct mbuf *);
502 u_int		 m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
503 void		 m_copyback(struct mbuf *, int, int, caddr_t);
504 void		 m_copydata(const struct mbuf *, int, int, caddr_t);
505 struct	mbuf	*m_copym(const struct mbuf *, int, int, int);
506 struct	mbuf	*m_copypacket(struct mbuf *, int);
507 struct	mbuf	*m_defrag(struct mbuf *, int);
508 struct	mbuf	*m_defrag_nofree(struct mbuf *, int);
509 struct	mbuf	*m_devget(char *, int, int, struct ifnet *,
510 		  void (*copy)(volatile const void *, volatile void *, size_t));
511 struct	mbuf	*m_dup(struct mbuf *, int);
512 struct	mbuf	*m_dup_data(struct mbuf *, int);
513 int		 m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
514 void		 m_extadd(struct mbuf *, caddr_t, u_int, void (*)(void *),
515 		  void (*)(void *), void *);
516 #ifdef MBUF_DEBUG
517 struct	mbuf	*_m_free(struct mbuf *, const char *name);
518 void		 _m_freem(struct mbuf *, const char *name);
519 #else
520 struct	mbuf	*m_free(struct mbuf *);
521 void		 m_freem(struct mbuf *);
522 #endif
523 struct	mbuf	*m_get(int, int);
524 struct	mbuf	*m_getc(int len, int how, int type);
525 struct	mbuf	*m_getcl(int how, short type, int flags);
526 struct	mbuf	*m_getjcl(int how, short type, int flags, size_t size);
527 struct	mbuf	*m_getclr(int, int);
528 struct	mbuf	*m_gethdr(int, int);
529 struct	mbuf	*m_getm(struct mbuf *, int, int, int);
530 struct	mbuf	*m_getptr(struct mbuf *, int, int *);
531 struct	mbuf	*m_last(struct mbuf *m);
532 u_int		 m_lengthm(struct mbuf *m, struct mbuf **lastm);
533 void		 m_move_pkthdr(struct mbuf *, struct mbuf *);
534 struct	mbuf	*m_prepend(struct mbuf *, int, int);
535 void		 m_print(const struct mbuf *m);
536 struct	mbuf	*m_pulldown(struct mbuf *, int, int, int *);
537 struct	mbuf	*m_pullup(struct mbuf *, int);
538 struct	mbuf	*m_split(struct mbuf *, int, int);
539 struct	mbuf 	*m_uiomove(struct uio *);
540 struct	mbuf	*m_unshare(struct mbuf *, int);
541 void		m_mclget(struct mbuf *m, int how);
542 int		m_sharecount(struct mbuf *m);
543 void		m_chtype(struct mbuf *m, int type);
544 int		m_devpad(struct mbuf *m, int padto);
545 
546 #ifdef MBUF_DEBUG
547 
548 void		mbuftrackid(struct mbuf *, int);
549 
550 #define m_free(m)	_m_free(m, __func__)
551 #define m_freem(m)	_m_freem(m, __func__)
552 
553 #else
554 
555 #define mbuftrackid(m, id)	/* empty */
556 
557 #endif
558 
559 /*
560  * Allocate the right type of mbuf for the desired total length.
561  * The mbuf returned does not necessarily cover the entire requested length.
562  * This function follows mbuf chaining policy of allowing MINCLSIZE
563  * amount of chained mbufs.
564  */
565 static __inline struct mbuf *
566 m_getl(int len, int how, int type, int flags, int *psize)
567 {
568 	struct mbuf *m;
569 	int size;
570 
571 	if (len >= MINCLSIZE) {
572 		m = m_getcl(how, type, flags);
573 		size = MCLBYTES;
574 	} else if (flags & M_PKTHDR) {
575 		m = m_gethdr(how, type);
576 		size = MHLEN;
577 	} else {
578 		m = m_get(how, type);
579 		size = MLEN;
580 	}
581 	if (psize != NULL)
582 		*psize = size;
583 	return (m);
584 }
585 
586 static __inline struct mbuf *
587 m_getlj(int len, int how, int type, int flags, int *psize)
588 {
589 	if (len > MCLBYTES) {
590 		struct mbuf *m;
591 
592 		m = m_getjcl(how, type, flags, MJUMPAGESIZE);
593 		if (psize != NULL)
594 			*psize = MJUMPAGESIZE;
595 		return m;
596 	}
597 	return m_getl(len, how, type, flags, psize);
598 }
599 
600 /*
601  * Get a single mbuf that covers the requested number of bytes.
602  * This function does not create mbuf chains.  It explicitly marks
603  * places in the code that abuse mbufs for contiguous data buffers.
604  */
605 static __inline struct mbuf *
606 m_getb(int len, int how, int type, int flags)
607 {
608 	struct mbuf *m;
609 	int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
610 
611 	if (len > mbufsize)
612 		m = m_getcl(how, type, flags);
613 	else if (flags & M_PKTHDR)
614 		m = m_gethdr(how, type);
615 	else
616 		m = m_get(how, type);
617 	return (m);
618 }
619 
620 /*
621  * Packets may have annotations attached by affixing a list
622  * of "packet tags" to the pkthdr structure.  Packet tags are
623  * dynamically allocated semi-opaque data structures that have
624  * a fixed header (struct m_tag) that specifies the size of the
625  * memory block and a <cookie,type> pair that identifies it.
626  * The cookie is a 32-bit unique unsigned value used to identify
627  * a module or ABI.  By convention this value is chose as the
628  * date+time that the module is created, expressed as the number of
629  * seconds since the epoch (e.g. using date -u +'%s').  The type value
630  * is an ABI/module-specific value that identifies a particular annotation
631  * and is private to the module.  For compatibility with systems
632  * like openbsd that define packet tags w/o an ABI/module cookie,
633  * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
634  * m_tag_find compatibility shim functions and several tag types are
635  * defined below.  Users that do not require compatibility should use
636  * a private cookie value so that packet tag-related definitions
637  * can be maintained privately.
638  *
639  * Note that the packet tag returned by m_tag_alloc has the default
640  * memory alignment implemented by kmalloc.  To reference private data
641  * one can use a construct like:
642  *
643  *	struct m_tag *mtag = m_tag_alloc(...);
644  *	struct foo *p = m_tag_data(mtag);
645  *
646  * if the alignment of struct m_tag is sufficient for referencing members
647  * of struct foo.  Otherwise it is necessary to embed struct m_tag within
648  * the private data structure to insure proper alignment; e.g.
649  *
650  *	struct foo {
651  *		struct m_tag	tag;
652  *		...
653  *	};
654  *	struct foo *p = (struct foo *)m_tag_alloc(...);
655  *	struct m_tag *mtag = &p->tag;
656  */
657 
658 #define	PACKET_TAG_NONE				0  /* Nadda */
659 
660 /* Packet tag for use with PACKET_ABI_COMPAT */
661 #define	PACKET_TAG_IPSEC_IN_DONE		1  /* IPsec applied, in */
662 /* struct tdb_indent */
663 #define	PACKET_TAG_IPSEC_OUT_DONE		2  /* IPsec applied, out */
664 /* struct tdb_indent */
665 #define	PACKET_TAG_IPSEC_IN_CRYPTO_DONE		3  /* NIC IPsec crypto done */
666 /* struct tdb_indent, never added */
667 #define	PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED	4  /* NIC IPsec crypto req'ed */
668 /* struct tdb_indent, never added */
669 #define	PACKET_TAG_IPSEC_PENDING_TDB		5  /* Reminder to do IPsec */
670 /* struct tdb_indent, never added */
671 #define	PACKET_TAG_ENCAP			6 /* Encap.  processing */
672 /* struct ifnet *, the GIF interface */
673 #define	PACKET_TAG_IPSEC_HISTORY		7 /* IPSEC history */
674 /* struct ipsec_history */
675 #define	PACKET_TAG_IPV6_INPUT			8 /* IPV6 input processing */
676 /* struct ip6aux */
677 #define	PACKET_TAG_IPFW_DIVERT			9 /* divert info */
678 /* struct divert_info */
679 #define	PACKET_TAG_DUMMYNET			15 /* dummynet info */
680 /* struct dn_pkt */
681 #define	PACKET_TAG_IPFORWARD			18 /* ipforward info */
682 /* struct sockaddr_in */
683 #define PACKET_TAG_IPSRCRT			27 /* IP srcrt opts */
684 /* struct ip_srcrt_opt */
685 #define	PACKET_TAG_CARP                         28 /* CARP info */
686 /* struct pf_mtag */
687 #define PACKET_TAG_PF				29 /* PF info */
688 
689 #define PACKET_TAG_PF_DIVERT			0x0200 /* pf(4) diverted packet */
690 
691 
692 /* Packet tag routines */
693 struct	m_tag 	*m_tag_alloc(uint32_t, int, int, int);
694 void		 m_tag_free(struct m_tag *);
695 void		 m_tag_prepend(struct mbuf *, struct m_tag *);
696 void		 m_tag_unlink(struct mbuf *, struct m_tag *);
697 void		 m_tag_delete(struct mbuf *, struct m_tag *);
698 void		 m_tag_delete_chain(struct mbuf *);
699 struct	m_tag	*m_tag_locate(struct mbuf *, uint32_t, int, struct m_tag *);
700 struct	m_tag	*m_tag_copy(struct m_tag *, int);
701 int		 m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
702 void		 m_tag_init(struct mbuf *);
703 struct	m_tag	*m_tag_first(struct mbuf *);
704 struct	m_tag	*m_tag_next(struct mbuf *, struct m_tag *);
705 
706 /* these are for openbsd compatibility */
707 #define	MTAG_ABI_COMPAT		0		/* compatibility ABI */
708 
709 static __inline void *
710 m_tag_data(struct m_tag *tag)
711 {
712 	return ((void *)(tag + 1));
713 }
714 
715 static __inline struct m_tag *
716 m_tag_get(int type, int length, int wait)
717 {
718 	return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
719 }
720 
721 static __inline struct m_tag *
722 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
723 {
724 	return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
725 }
726 
727 #endif	/* _KERNEL */
728 
729 #endif	/* _KERNEL || _KERNEL_STRUCTURES */
730 #endif	/* !_SYS_MBUF_H_ */
731