xref: /dragonfly/sys/sys/mbuf.h (revision cc87404e)
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. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  *
31  *	@(#)mbuf.h	8.5 (Berkeley) 2/19/95
32  * $FreeBSD: src/sys/sys/mbuf.h,v 1.44.2.17 2003/04/15 06:15:02 silby Exp $
33  */
34 
35 #ifndef _SYS_MBUF_H_
36 #define	_SYS_MBUF_H_
37 
38 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
39 
40 #ifndef _SYS_TYPES_H_
41 #include <sys/types.h>
42 #endif
43 #ifndef _SYS_PARAM_H_
44 #include <sys/param.h>
45 #endif
46 #ifndef _SYS_QUEUE_H_
47 #include <sys/queue.h>
48 #endif
49 #ifndef _NET_NETISR_H_
50 #include <net/netisr.h>
51 #endif
52 #ifndef _NET_ETHERNET_H_
53 #include <net/ethernet.h>
54 #endif
55 
56 /*
57  * Mbufs are of a single size, MSIZE (machine/param.h), which
58  * includes overhead.  An mbuf may add a single "mbuf cluster" of size
59  * MCLBYTES (also in machine/param.h), which has no additional overhead
60  * and is used instead of the internal data area; this is done when
61  * at least MINCLSIZE of data must be stored.
62  */
63 #define	MLEN		(MSIZE - sizeof(struct m_hdr))	/* normal data len */
64 #define	MHLEN		(MLEN - sizeof(struct pkthdr))	/* data len w/pkthdr */
65 #define	MINCLSIZE	(MHLEN + 1)	/* smallest amount to put in cluster */
66 #define	M_MAXCOMPRESS	(MHLEN / 2)	/* max amount to copy for compression */
67 
68 /*
69  * Macros for type conversion:
70  * mtod(m, t)		-- Convert mbuf pointer to data pointer of correct type.
71  * mtodoff(m, t, off)	-- Convert mbuf pointer at the specified offset to data
72  *			   pointer of correct type.
73  */
74 #define	mtod(m, t)		((t)((m)->m_data))
75 #define	mtodoff(m, t, off)	((t)((m)->m_data + (off)))
76 
77 /*
78  * Header present at the beginning of every mbuf.
79  */
80 struct m_hdr {
81 	struct	mbuf *mh_next;		/* next buffer in chain */
82 	struct	mbuf *mh_nextpkt;	/* next chain in queue/record */
83 	caddr_t	mh_data;		/* location of data */
84 	int	mh_len;			/* amount of data in this mbuf */
85 	int	mh_flags;		/* flags; see below */
86 	short	mh_type;		/* type of data in this mbuf */
87 	short	mh_pad;			/* padding */
88 	/* XXX implicit 4 bytes padding on x86_64 */
89 #ifdef MBUF_DEBUG
90 	const char *mh_lastfunc;
91 #endif
92 	union {
93 		struct netmsg_packet mhm_pkt;	/* hardware->proto stack msg */
94 		struct netmsg_pru_send mhm_snd;	/* usrspace->proto stack msg */
95 		struct netmsg_inarp mhm_arp;	/* proto stack arpinput msg */
96 		struct netmsg_ctlinput mhm_ctl;	/* proto stack ctlinput msg */
97 	} mh_msgu;
98 };
99 #define mh_netmsg	mh_msgu.mhm_pkt
100 #define mh_sndmsg	mh_msgu.mhm_snd
101 #define mh_arpmsg	mh_msgu.mhm_arp
102 #define mh_ctlmsg	mh_msgu.mhm_ctl
103 
104 /* pf stuff */
105 struct pkthdr_pf {
106 	void		*hdr;		/* saved hdr pos in mbuf, for ECN */
107 	void		*statekey;	/* pf stackside statekey */
108 	u_int		rtableid;	/* alternate routing table id */
109 	uint32_t	qid;		/* queue id */
110 	uint16_t	tag;		/* tag id */
111 	uint8_t		flags;
112 	uint8_t		routed;
113 	uint32_t	state_hash;	/* identifies 'connections' */
114 	uint8_t		ecn_af;		/* for altq_red */
115 	uint8_t		unused01;
116 	uint8_t		unused02;
117 	uint8_t		unused03;
118 	/* XXX implicit 4 bytes padding on x86_64 */
119 };
120 
121 /* pkthdr_pf.flags */
122 #define	PF_TAG_GENERATED		0x01
123 #define	PF_TAG_FRAGCACHE		0x02
124 #define	PF_TAG_TRANSLATE_LOCALHOST	0x04
125 #define	PF_TAG_DIVERTED			0x08
126 #define	PF_TAG_DIVERTED_PACKET		0x10
127 #define	PF_TAG_REROUTE			0x20
128 
129 /*
130  * Packet tag structure (see below for details).
131  */
132 struct m_tag {
133 	SLIST_ENTRY(m_tag)	m_tag_link;	/* List of packet tags */
134 	uint16_t		m_tag_id;	/* Tag ID */
135 	uint16_t		m_tag_len;	/* Length of data */
136 	uint32_t		m_tag_cookie;	/* ABI/Module ID */
137 };
138 
139 SLIST_HEAD(packet_tags, m_tag);
140 
141 /*
142  * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
143  *
144  * Be careful: The fields have been carefully ordered to avoid hidden padding.
145  *             Keep this in mind, when adding or removing fields!
146  */
147 struct pkthdr {
148 	struct	ifnet *rcvif;		/* rcv interface */
149 	struct packet_tags tags;	/* list of packet tags */
150 
151 	/* variables for ip and tcp reassembly */
152 	void	*header;		/* pointer to packet header */
153 	int	len;			/* total packet length */
154 
155 	/* variables for hardware checksum */
156 	int	csum_flags;		/* flags regarding checksum */
157 	int	csum_data;		/* data field used by csum routines */
158 	uint16_t csum_iphlen;		/* IP header length */
159 					/* valid if CSUM IP|UDP|TCP|TSO */
160 	uint8_t	csum_thlen;		/* TCP/UDP header length */
161 					/* valid if CSUM UDP|TCP|TSO */
162 	uint8_t	csum_lhlen;		/* link header length */
163 
164 	uint16_t tso_segsz;		/* TSO segment size */
165 	uint16_t ether_vlantag;		/* ethernet 802.1p+q vlan tag */
166 
167 	uint16_t hash;			/* packet hash */
168 	uint16_t unused1;		/* reserved for route table id */
169 	uint32_t unused2;		/* reserved for codel timestamp */
170 
171 	uint16_t wlan_seqno;		/* IEEE 802.11 seq no. */
172 	/*
173 	 * Valid if BRIDGE_MBUF_TAGGED is set in fw_flags, records
174 	 * the original ether source address (if compatible).
175 	 */
176 	uint8_t ether_br_shost[ETHER_ADDR_LEN];
177 
178 	/* firewall flags */
179 	uint32_t fw_flags;		/* flags for FW */
180 
181 	/* variables for PF processing */
182 	struct pkthdr_pf pf;		/* structure for PF */
183 };
184 
185 /*
186  * Description of external storage mapped into mbuf; valid only if M_EXT is set.
187  */
188 struct m_ext {
189 	caddr_t	ext_buf;		/* start of buffer */
190 	void	(*ext_free)(void *);
191 	u_int	ext_size;		/* size of buffer, for ext_free */
192 	void	(*ext_ref)(void *);
193 	void	*ext_arg;
194 };
195 
196 /*
197  * The core of the mbuf object along with some shortcut defines for
198  * practical purposes.
199  */
200 struct mbuf {
201 	struct	m_hdr m_hdr;
202 	union {
203 		struct {
204 			struct	pkthdr MH_pkthdr;	/* M_PKTHDR set */
205 			union {
206 				struct	m_ext MH_ext;	/* M_EXT set */
207 				char	MH_databuf[MHLEN];
208 			} MH_dat;
209 		} MH;
210 		char	M_databuf[MLEN];		/* !M_PKTHDR, !M_EXT */
211 	} M_dat;
212 };
213 #define	m_next		m_hdr.mh_next
214 #define	m_len		m_hdr.mh_len
215 #define	m_data		m_hdr.mh_data
216 #define	m_type		m_hdr.mh_type
217 #define	m_flags		m_hdr.mh_flags
218 #define	m_nextpkt	m_hdr.mh_nextpkt
219 #define	m_pkthdr	M_dat.MH.MH_pkthdr
220 #define	m_ext		M_dat.MH.MH_dat.MH_ext
221 #define	m_pktdat	M_dat.MH.MH_dat.MH_databuf
222 #define	m_dat		M_dat.M_databuf
223 
224 /*
225  * Code that uses m_act should be converted to use m_nextpkt
226  * instead; m_act is historical and deprecated.
227  */
228 #define m_act   	m_nextpkt
229 
230 /*
231  * mbuf flags.
232  */
233 #define	M_EXT		0x0001	/* has associated external storage */
234 #define	M_PKTHDR	0x0002	/* start of record */
235 #define	M_EOR		0x0004	/* end of record */
236 #define	M_PROTO1	0x0008	/* protocol-specific */
237 #define	M_PROTO2	0x0010	/* protocol-specific */
238 #define	M_PROTO3	0x0020	/* protocol-specific */
239 #define	M_PROTO4	0x0040	/* protocol-specific */
240 #define	M_PROTO5	0x0080	/* protocol-specific */
241 
242 /*
243  * mbuf pkthdr flags (also stored in m_flags).
244  */
245 #define	M_BCAST		0x0100	/* send/received as link-level broadcast */
246 #define	M_MCAST		0x0200	/* send/received as link-level multicast */
247 #define	M_FRAG		0x0400	/* packet is a fragment of a larger packet */
248 #define	M_FIRSTFRAG	0x0800	/* packet is first fragment */
249 #define	M_LASTFRAG	0x1000	/* packet is last fragment */
250 #define	M_CLCACHE	0x2000	/* mbuf allocated from the cluster cache */
251 #define M_EXT_CLUSTER	0x4000	/* standard cluster else special */
252 #define	M_PHCACHE	0x8000	/* mbuf allocated from the pkt header cache */
253 #define M_UNUSED16	0x10000	/* was: notification event (SCTP) */
254 #define M_VLANTAG	0x20000	/* ether_vlantag is valid */
255 #define M_MPLSLABELED	0x40000	/* packet is mpls labeled */
256 #define M_LENCHECKED	0x80000	/* packet proto lengths are checked */
257 #define M_HASH		0x100000/* hash field in pkthdr is valid */
258 #define M_PROTO6        0x200000/* protocol-specific */
259 #define M_PROTO7        0x400000/* protocol-specific */
260 #define M_PROTO8        0x800000/* protocol-specific */
261 #define M_CKHASH	0x1000000/* hash needs software verification */
262 #define M_PRIO		0x2000000/* high priority mbuf */
263 #define M_SOLOCKED	0x4000000/* locked by userland for read() */
264 
265 /*
266  * Flags copied when copying m_pkthdr.
267  */
268 #define	M_COPYFLAGS	(M_PKTHDR|M_EOR|M_PROTO1|M_PROTO2|M_PROTO3 | \
269 			 M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8 | \
270 			 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \
271 			 M_VLANTAG|M_MPLSLABELED | \
272 			 M_LENCHECKED|M_HASH|M_CKHASH|M_PRIO)
273 
274 /*
275  * Flags indicating hw checksum support and sw checksum requirements.
276  */
277 #define	CSUM_IP			0x0001		/* will csum IP */
278 #define	CSUM_TCP		0x0002		/* will csum TCP */
279 #define	CSUM_UDP		0x0004		/* will csum UDP */
280 #define	CSUM_IP_FRAGS		0x0008		/* will csum IP fragments */
281 #define	CSUM_FRAGMENT		0x0010		/* will do IP fragmentation */
282 
283 #define	CSUM_IP_CHECKED		0x0100		/* did csum IP */
284 #define	CSUM_IP_VALID		0x0200		/*   ... the csum is valid */
285 #define	CSUM_DATA_VALID		0x0400		/* csum_data field is valid */
286 #define	CSUM_PSEUDO_HDR		0x0800		/* csum_data has pseudo hdr */
287 #define CSUM_FRAG_NOT_CHECKED	0x1000		/* did _not_ csum fragment
288 						 * NB: This flag is only used
289 						 * by IP defragmenter.
290 						 */
291 #define CSUM_TSO		0x2000		/* will do TCP segmentation */
292 
293 #define	CSUM_DELAY_DATA		(CSUM_TCP | CSUM_UDP)
294 #define	CSUM_DELAY_IP		(CSUM_IP)	/* XXX add ipv6 here too? */
295 
296 /*
297  * Flags indicating PF processing status
298  */
299 #define FW_MBUF_GENERATED	0x00000001
300 #define	PF_MBUF_STRUCTURE	0x00000002	/* m_pkthdr.pf valid */
301 #define	PF_MBUF_ROUTED		0x00000004	/* pf_routed field is valid */
302 #define	PF_MBUF_TAGGED		0x00000008
303 #define	XX_MBUF_UNUSED10	0x00000010
304 #define	XX_MBUF_UNUSED20	0x00000020
305 #define IPFORWARD_MBUF_TAGGED	0x00000040
306 #define DUMMYNET_MBUF_TAGGED	0x00000080
307 #define BRIDGE_MBUF_TAGGED	0x00000100
308 #define FW_MBUF_REDISPATCH	0x00000200
309 #define	IPFW_MBUF_GENERATED	FW_MBUF_GENERATED
310 /*
311  * mbuf types.
312  */
313 #define	MT_FREE		0	/* should be on free list */
314 #define	MT_DATA		1	/* dynamic (data) allocation */
315 #define	MT_HEADER	2	/* packet header */
316 #define	MT_SONAME	3	/* socket name */
317 /* 4 was MT_TAG */
318 #define	MT_CONTROL	5	/* extra-data protocol message */
319 #define	MT_OOBDATA	6	/* expedited data  */
320 #define	MT_NTYPES	7	/* number of mbuf types for mbtypes[] */
321 
322 /*
323  * General mbuf allocator statistics structure.
324  *
325  * NOTE: Make sure this struct's size is multiple cache line size.
326  */
327 struct mbstat {
328 	u_long	m_mbufs;	/* mbufs obtained from page pool */
329 	u_long	m_clusters;	/* clusters obtained from page pool */
330 	u_long	m_jclusters;	/* jclusters obtained from page pool */
331 	u_long	m_clfree;	/* free clusters */
332 	u_long	m_drops;	/* times failed to find space */
333 	u_long	m_wait;		/* times waited for space */
334 	u_long	m_drain;	/* times drained protocols for space */
335 	u_long	m_mcfail;	/* times m_copym failed */
336 	u_long	m_mpfail;	/* times m_pullup failed */
337 	u_long	m_msize;	/* length of an mbuf */
338 	u_long	m_mclbytes;	/* length of an mbuf cluster */
339 	u_long	m_mjumpagesize;	/* length of a jumbo mbuf cluster */
340 	u_long	m_minclsize;	/* min length of data to allocate a cluster */
341 	u_long	m_mlen;		/* length of data in an mbuf */
342 	u_long	m_mhlen;	/* length of data in a header mbuf */
343 	u_long	m_pad;		/* pad to cache line size (64B) */
344 };
345 
346 /*
347  * objcache(9) ocflags sanitizing
348  */
349 #define	MB_OCFLAG(how)	((how) & M_WAITOK ? M_WAITOK : M_NOWAIT)
350 
351 /*
352  * These are identifying numbers passed to the m_mballoc_wait function,
353  * allowing us to determine whether the call came from an MGETHDR or
354  * an MGET.
355  */
356 #define	MGETHDR_C      1
357 #define	MGET_C         2
358 
359 /*
360  * mbuf allocation/deallocation macros (YYY deprecated, too big):
361  *
362  *	MGET(struct mbuf *m, int how, int type)
363  * allocates an mbuf and initializes it to contain internal data.
364  *
365  *	MGETHDR(struct mbuf *m, int how, int type)
366  * allocates an mbuf and initializes it to contain a packet header
367  * and internal data.
368  */
369 #define	MGET(m, how, type) do {						\
370 	(m) = m_get((how), (type));					\
371 } while (0)
372 
373 #define	MGETHDR(m, how, type) do {					\
374 	(m) = m_gethdr((how), (type));					\
375 } while (0)
376 
377 /*
378  * MCLGET adds such clusters to a normal mbuf.  The flag M_EXT is set upon
379  * success.
380  * Deprecated.  Use m_getcl() or m_getl() instead.
381  */
382 #define	MCLGET(m, how) do {						\
383 	m_mclget((m), (how));						\
384 } while (0)
385 
386 /*
387  * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
388  *     or m_dup_pkthdr.
389  */
390 /*
391  * Move mbuf pkthdr from "from" to "to".
392  * from should have M_PKTHDR set, and to must be empty.
393  * from no longer has a pkthdr after this operation.
394  */
395 #define	M_MOVE_PKTHDR(_to, _from)	m_move_pkthdr((_to), (_from))
396 
397 /*
398  * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
399  * an object of the specified size at the end of the mbuf, longword aligned.
400  */
401 #define	M_ALIGN(m, len) do {						\
402 	(m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1);		\
403 } while (0)
404 
405 /*
406  * As above, for mbufs allocated with m_gethdr/MGETHDR
407  * or initialized by M_COPY_PKTHDR.
408  */
409 #define	MH_ALIGN(m, len) do {						\
410 	(m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1);		\
411 } while (0)
412 
413 /*
414  * Check if we can write to an mbuf.
415  */
416 #define M_EXT_WRITABLE(m)	(m_sharecount(m) == 1)
417 #define M_WRITABLE(m)		(!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
418 
419 /*
420  * Check if the supplied mbuf has a packet header, or else panic.
421  */
422 #define	M_ASSERTPKTHDR(m)						\
423 	KASSERT(m != NULL && m->m_flags & M_PKTHDR,			\
424 		("%s: invalid mbuf or no mbuf packet header!", __func__))
425 
426 /*
427  * Compute the amount of space available before the current start of data.
428  * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
429  * of checking writability of the mbuf data area rests solely with the caller.
430  */
431 #define	M_LEADINGSPACE(m)						\
432 	((m)->m_flags & M_EXT ?						\
433 	    (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0):	\
434 	    (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat :	\
435 	    (m)->m_data - (m)->m_dat)
436 
437 /*
438  * Compute the amount of space available after the end of data in an mbuf.
439  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
440  * of checking writability of the mbuf data area rests solely with the caller.
441  */
442 #define	M_TRAILINGSPACE(m)						\
443 	((m)->m_flags & M_EXT ?						\
444 	    (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size	\
445 		- ((m)->m_data + (m)->m_len) : 0) :			\
446 	    &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
447 
448 /*
449  * Arrange to prepend space of size plen to mbuf m.
450  * If a new mbuf must be allocated, how specifies whether to wait.
451  * If how is M_NOWAIT and allocation fails, the original mbuf chain
452  * is freed and m is set to NULL.
453  */
454 #define	M_PREPEND(m, plen, how) do {					\
455 	struct mbuf **_mmp = &(m);					\
456 	struct mbuf *_mm = *_mmp;					\
457 	int _mplen = (plen);						\
458 	int __mhow = (how);						\
459 									\
460 	if (M_LEADINGSPACE(_mm) >= _mplen) {				\
461 		_mm->m_data -= _mplen;					\
462 		_mm->m_len += _mplen;					\
463 	} else								\
464 		_mm = m_prepend(_mm, _mplen, __mhow);			\
465 	if (_mm != NULL && (_mm->m_flags & M_PKTHDR))			\
466 		_mm->m_pkthdr.len += _mplen;				\
467 	*_mmp = _mm;							\
468 } while (0)
469 
470 /* Length to m_copy to copy all. */
471 #define	M_COPYALL	1000000000
472 
473 /* Compatibility with 4.3 */
474 #define	m_copy(m, o, l)	m_copym((m), (o), (l), M_NOWAIT)
475 
476 #ifdef _KERNEL
477 extern	u_int		 m_clalloc_wid;	/* mbuf cluster wait count */
478 extern	u_int		 m_mballoc_wid;	/* mbuf wait count */
479 extern	int		 max_linkhdr;	/* largest link-level header */
480 extern	int		 max_protohdr;	/* largest protocol header */
481 extern	int		 max_hdr;	/* largest link+protocol header */
482 extern	int		 max_datalen;	/* MHLEN - max_hdr */
483 extern	int		 mbuf_wait;	/* mbuf sleep time */
484 extern	int		 nmbclusters;
485 extern	int		 nmbufs;
486 
487 struct uio;
488 
489 void		 mcl_inclimit(int);
490 void		 mjcl_inclimit(int);
491 void		 mb_inclimit(int);
492 void		 m_adj(struct mbuf *, int);
493 void		 m_align(struct mbuf *, int);
494 int		 m_apply(struct mbuf *, int, int,
495 		    int (*)(void *, void *, u_int), void *);
496 int		m_append(struct mbuf *, int, c_caddr_t);
497 void		 m_cat(struct mbuf *, struct mbuf *);
498 u_int		 m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
499 void		 m_copyback(struct mbuf *, int, int, caddr_t);
500 void		 m_copydata(const struct mbuf *, int, int, caddr_t);
501 struct	mbuf	*m_copym(const struct mbuf *, int, int, int);
502 struct	mbuf	*m_copypacket(struct mbuf *, int);
503 struct	mbuf	*m_defrag(struct mbuf *, int);
504 struct	mbuf	*m_defrag_nofree(struct mbuf *, int);
505 struct	mbuf	*m_devget(char *, int, int, struct ifnet *,
506 		  void (*copy)(volatile const void *, volatile void *, size_t));
507 struct	mbuf	*m_dup(struct mbuf *, int);
508 struct	mbuf	*m_dup_data(struct mbuf *, int);
509 int		 m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
510 void		 m_extadd(struct mbuf *, caddr_t, u_int, void (*)(void *),
511 		  void (*)(void *), void *);
512 #ifdef MBUF_DEBUG
513 struct	mbuf	*_m_free(struct mbuf *, const char *name);
514 void		 _m_freem(struct mbuf *, const char *name);
515 #else
516 struct	mbuf	*m_free(struct mbuf *);
517 void		 m_freem(struct mbuf *);
518 #endif
519 struct	mbuf	*m_get(int, int);
520 struct	mbuf	*m_getc(int len, int how, int type);
521 struct	mbuf	*m_getcl(int how, short type, int flags);
522 struct	mbuf	*m_getjcl(int how, short type, int flags, size_t size);
523 struct	mbuf	*m_getclr(int, int);
524 struct	mbuf	*m_gethdr(int, int);
525 struct	mbuf	*m_getm(struct mbuf *, int, int, int);
526 struct	mbuf	*m_getptr(struct mbuf *, int, int *);
527 struct	mbuf	*m_last(struct mbuf *m);
528 u_int		 m_lengthm(struct mbuf *m, struct mbuf **lastm);
529 void		 m_move_pkthdr(struct mbuf *, struct mbuf *);
530 struct	mbuf	*m_prepend(struct mbuf *, int, int);
531 void		 m_print(const struct mbuf *m);
532 struct	mbuf	*m_pulldown(struct mbuf *, int, int, int *);
533 struct	mbuf	*m_pullup(struct mbuf *, int);
534 struct	mbuf	*m_split(struct mbuf *, int, int);
535 struct	mbuf 	*m_uiomove(struct uio *);
536 struct	mbuf	*m_unshare(struct mbuf *, int);
537 void		m_mclget(struct mbuf *m, int how);
538 int		m_sharecount(struct mbuf *m);
539 void		m_chtype(struct mbuf *m, int type);
540 int		m_devpad(struct mbuf *m, int padto);
541 
542 #ifdef MBUF_DEBUG
543 
544 void		mbuftrackid(struct mbuf *, int);
545 
546 #define m_free(m)	_m_free(m, __func__)
547 #define m_freem(m)	_m_freem(m, __func__)
548 
549 #else
550 
551 #define mbuftrackid(m, id)	/* empty */
552 
553 #endif
554 
555 /*
556  * Allocate the right type of mbuf for the desired total length.
557  * The mbuf returned does not necessarily cover the entire requested length.
558  * This function follows mbuf chaining policy of allowing MINCLSIZE
559  * amount of chained mbufs.
560  */
561 static __inline struct mbuf *
562 m_getl(int len, int how, int type, int flags, int *psize)
563 {
564 	struct mbuf *m;
565 	int size;
566 
567 	if (len >= MINCLSIZE) {
568 		m = m_getcl(how, type, flags);
569 		size = MCLBYTES;
570 	} else if (flags & M_PKTHDR) {
571 		m = m_gethdr(how, type);
572 		size = MHLEN;
573 	} else {
574 		m = m_get(how, type);
575 		size = MLEN;
576 	}
577 	if (psize != NULL)
578 		*psize = size;
579 	return (m);
580 }
581 
582 static __inline struct mbuf *
583 m_getlj(int len, int how, int type, int flags, int *psize)
584 {
585 	if (len > MCLBYTES) {
586 		struct mbuf *m;
587 
588 		m = m_getjcl(how, type, flags, MJUMPAGESIZE);
589 		if (psize != NULL)
590 			*psize = MJUMPAGESIZE;
591 		return m;
592 	}
593 	return m_getl(len, how, type, flags, psize);
594 }
595 
596 /*
597  * Get a single mbuf that covers the requested number of bytes.
598  * This function does not create mbuf chains.  It explicitly marks
599  * places in the code that abuse mbufs for contiguous data buffers.
600  */
601 static __inline struct mbuf *
602 m_getb(int len, int how, int type, int flags)
603 {
604 	struct mbuf *m;
605 	int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
606 
607 	if (len > mbufsize)
608 		m = m_getcl(how, type, flags);
609 	else if (flags & M_PKTHDR)
610 		m = m_gethdr(how, type);
611 	else
612 		m = m_get(how, type);
613 	return (m);
614 }
615 
616 /*
617  * Packets may have annotations attached by affixing a list
618  * of "packet tags" to the pkthdr structure.  Packet tags are
619  * dynamically allocated semi-opaque data structures that have
620  * a fixed header (struct m_tag) that specifies the size of the
621  * memory block and a <cookie,type> pair that identifies it.
622  * The cookie is a 32-bit unique unsigned value used to identify
623  * a module or ABI.  By convention this value is chose as the
624  * date+time that the module is created, expressed as the number of
625  * seconds since the epoch (e.g. using date -u +'%s').  The type value
626  * is an ABI/module-specific value that identifies a particular annotation
627  * and is private to the module.  For compatibility with systems
628  * like openbsd that define packet tags w/o an ABI/module cookie,
629  * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
630  * m_tag_find compatibility shim functions and several tag types are
631  * defined below.  Users that do not require compatibility should use
632  * a private cookie value so that packet tag-related definitions
633  * can be maintained privately.
634  *
635  * Note that the packet tag returned by m_tag_alloc has the default
636  * memory alignment implemented by kmalloc.  To reference private data
637  * one can use a construct like:
638  *
639  *	struct m_tag *mtag = m_tag_alloc(...);
640  *	struct foo *p = m_tag_data(mtag);
641  *
642  * if the alignment of struct m_tag is sufficient for referencing members
643  * of struct foo.  Otherwise it is necessary to embed struct m_tag within
644  * the private data structure to insure proper alignment; e.g.
645  *
646  *	struct foo {
647  *		struct m_tag	tag;
648  *		...
649  *	};
650  *	struct foo *p = (struct foo *)m_tag_alloc(...);
651  *	struct m_tag *mtag = &p->tag;
652  */
653 
654 #define	PACKET_TAG_NONE				0  /* Nadda */
655 
656 /* Packet tag for use with PACKET_ABI_COMPAT */
657 #define	PACKET_TAG_IPSEC_IN_DONE		1  /* IPsec applied, in */
658 /* struct tdb_indent */
659 #define	PACKET_TAG_IPSEC_OUT_DONE		2  /* IPsec applied, out */
660 /* struct tdb_indent */
661 #define	PACKET_TAG_IPSEC_IN_CRYPTO_DONE		3  /* NIC IPsec crypto done */
662 /* struct tdb_indent, never added */
663 #define	PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED	4  /* NIC IPsec crypto req'ed */
664 /* struct tdb_indent, never added */
665 #define	PACKET_TAG_IPSEC_PENDING_TDB		5  /* Reminder to do IPsec */
666 /* struct tdb_indent, never added */
667 #define	PACKET_TAG_ENCAP			6 /* Encap.  processing */
668 /* struct ifnet *, the GIF interface */
669 #define	PACKET_TAG_IPSEC_HISTORY		7 /* IPSEC history */
670 /* struct ipsec_history */
671 #define	PACKET_TAG_IPV6_INPUT			8 /* IPV6 input processing */
672 /* struct ip6aux */
673 #define	PACKET_TAG_IPFW_DIVERT			9 /* divert info */
674 /* struct divert_info */
675 #define	PACKET_TAG_DUMMYNET			15 /* dummynet info */
676 /* struct dn_pkt */
677 #define	PACKET_TAG_IPFORWARD			18 /* ipforward info */
678 /* struct sockaddr_in */
679 #define PACKET_TAG_IPSRCRT			27 /* IP srcrt opts */
680 /* struct ip_srcrt_opt */
681 #define	PACKET_TAG_CARP                         28 /* CARP info */
682 /* struct pf_mtag */
683 #define PACKET_TAG_PF				29 /* PF info */
684 
685 #define PACKET_TAG_PF_DIVERT			0x0200 /* pf(4) diverted packet */
686 
687 
688 /* Packet tag routines */
689 struct	m_tag 	*m_tag_alloc(uint32_t, int, int, int);
690 void		 m_tag_free(struct m_tag *);
691 void		 m_tag_prepend(struct mbuf *, struct m_tag *);
692 void		 m_tag_unlink(struct mbuf *, struct m_tag *);
693 void		 m_tag_delete(struct mbuf *, struct m_tag *);
694 void		 m_tag_delete_chain(struct mbuf *);
695 struct	m_tag	*m_tag_locate(struct mbuf *, uint32_t, int, struct m_tag *);
696 struct	m_tag	*m_tag_copy(struct m_tag *, int);
697 int		 m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
698 void		 m_tag_init(struct mbuf *);
699 struct	m_tag	*m_tag_first(struct mbuf *);
700 struct	m_tag	*m_tag_next(struct mbuf *, struct m_tag *);
701 
702 /* these are for openbsd compatibility */
703 #define	MTAG_ABI_COMPAT		0		/* compatibility ABI */
704 
705 static __inline void *
706 m_tag_data(struct m_tag *tag)
707 {
708 	return ((void *)(tag + 1));
709 }
710 
711 static __inline struct m_tag *
712 m_tag_get(int type, int length, int wait)
713 {
714 	return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
715 }
716 
717 static __inline struct m_tag *
718 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
719 {
720 	return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
721 }
722 
723 #endif	/* _KERNEL */
724 
725 #endif	/* _KERNEL || _KERNEL_STRUCTURES */
726 #endif	/* !_SYS_MBUF_H_ */
727