xref: /dragonfly/sys/sys/mbuf.h (revision 35e996c9)
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, which includes overhead.
58  * An mbuf may add a single "mbuf cluster" of size MCLBYTES, which has
59  * no additional overhead and is used instead of the internal data area;
60  * this is done when at least MINCLSIZE of data must be stored.
61  */
62 #define	MLEN		(MSIZE - sizeof(struct m_hdr))	/* normal data len */
63 #define	MHLEN		(MLEN - sizeof(struct pkthdr))	/* data len w/pkthdr */
64 #define	MINCLSIZE	(MHLEN + 1)	/* smallest amount to put in cluster */
65 #define	M_MAXCOMPRESS	(MHLEN / 2)	/* max amount to copy for compression */
66 
67 /*
68  * Macros for type conversion:
69  * mtod(m, t)		-- Convert mbuf pointer to data pointer of correct type.
70  * mtodoff(m, t, off)	-- Convert mbuf pointer at the specified offset to data
71  *			   pointer of correct type.
72  */
73 #define	mtod(m, t)		((t)((m)->m_data))
74 #define	mtodoff(m, t, off)	((t)((m)->m_data + (off)))
75 
76 /*
77  * Header present at the beginning of every mbuf.
78  */
79 struct m_hdr {
80 	struct	mbuf *mh_next;		/* next buffer in chain */
81 	union {
82 		struct	mbuf *mh_nextpkt; /* next chain in queue/record */
83 		STAILQ_ENTRY(mbuf) mh_stailqpkt;
84 	};
85 	caddr_t	mh_data;		/* location of data */
86 	int	mh_len;			/* amount of data in this mbuf */
87 	int	mh_flags;		/* flags; see below */
88 	short	mh_type;		/* type of data in this mbuf */
89 	short	mh_pad;			/* padding */
90 	/* XXX implicit 4 bytes padding on x86_64 */
91 #ifdef MBUF_DEBUG
92 	const char *mh_lastfunc;
93 #endif
94 	union {
95 		struct netmsg_packet mhm_pkt;	/* hardware->proto stack msg */
96 		struct netmsg_pru_send mhm_snd;	/* usrspace->proto stack msg */
97 		struct netmsg_inarp mhm_arp;	/* proto stack arpinput msg */
98 		struct netmsg_ctlinput mhm_ctl;	/* proto stack ctlinput msg */
99 		struct netmsg_genpkt mhm_gen;	/* generic pkt send/recv msg */
100 		struct netmsg_forward mhm_fwd;	/* forwarding 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 #define mh_genmsg	mh_msgu.mhm_gen
108 #define mh_fwdmsg	mh_msgu.mhm_fwd
109 
110 /* pf stuff */
111 struct pkthdr_pf {
112 	void		*hdr;		/* saved hdr pos in mbuf, for ECN */
113 	void		*statekey;	/* pf stackside statekey */
114 	u_int		rtableid;	/* alternate routing table id */
115 	uint32_t	qid;		/* queue id */
116 	uint16_t	tag;		/* tag id */
117 	uint8_t		flags;
118 	uint8_t		routed;
119 	uint32_t	state_hash;	/* identifies 'connections' */
120 	uint8_t		ecn_af;		/* for altq_red */
121 	uint8_t		unused01;
122 	uint8_t		unused02;
123 	uint8_t		unused03;
124 	/* XXX implicit 4 bytes padding on x86_64 */
125 };
126 
127 /* pkthdr_pf.flags */
128 #define	PF_TAG_GENERATED		0x01
129 #define	PF_TAG_FRAGCACHE		0x02
130 #define	PF_TAG_TRANSLATE_LOCALHOST	0x04
131 #define	PF_TAG_DIVERTED			0x08
132 #define	PF_TAG_DIVERTED_PACKET		0x10
133 #define	PF_TAG_REROUTE			0x20
134 
135 /*
136  * Packet tag structure (see below for details).
137  */
138 struct m_tag {
139 	SLIST_ENTRY(m_tag)	m_tag_link;	/* List of packet tags */
140 	uint16_t		m_tag_id;	/* Tag ID */
141 	uint16_t		m_tag_len;	/* Length of data */
142 	uint32_t		m_tag_cookie;	/* ABI/Module ID */
143 };
144 
145 SLIST_HEAD(packet_tags, m_tag);
146 
147 /*
148  * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
149  *
150  * Be careful: The fields have been carefully ordered to avoid hidden padding.
151  *             Keep this in mind, when adding or removing fields!
152  */
153 struct pkthdr {
154 	struct ifnet *rcvif;		/* rcv interface */
155 	struct packet_tags tags;	/* list of packet tags */
156 
157 	/* variables for ip and tcp reassembly */
158 	void	*header;		/* pointer to packet header */
159 	int	len;			/* total packet length */
160 
161 	/* variables for hardware checksum */
162 	int	csum_flags;		/* flags regarding checksum */
163 	int	csum_data;		/* data field used by csum routines */
164 	uint16_t csum_iphlen;		/* IP header length */
165 					/* valid if CSUM IP|UDP|TCP|TSO */
166 	uint8_t	csum_thlen;		/* TCP/UDP header length */
167 					/* valid if CSUM UDP|TCP|TSO */
168 	uint8_t	csum_lhlen;		/* link header length */
169 
170 	uint16_t tso_segsz;		/* TSO segment size */
171 	uint16_t ether_vlantag;		/* ethernet 802.1p+q vlan tag */
172 
173 	uint16_t hash;			/* packet hash */
174 	uint8_t loop_cnt;		/* in-kernel packet loop count */
175 	uint8_t unused1;		/* reserved for route table id */
176 	uint32_t unused2;		/* reserved for CoDel timestamp */
177 
178 	uint16_t wlan_seqno;		/* IEEE 802.11 seq no. */
179 	/*
180 	 * Valid if BRIDGE_MBUF_TAGGED is set in fw_flags, records
181 	 * the original ether source address (if compatible).
182 	 */
183 	uint8_t ether_br_shost[ETHER_ADDR_LEN];
184 
185 	/* firewall flags */
186 	uint32_t fw_flags;		/* flags for FW */
187 
188 	/* variables for PF processing */
189 	struct pkthdr_pf pf;		/* structure for PF */
190 };
191 
192 /*
193  * Description of external storage mapped into mbuf; valid only if M_EXT is set.
194  */
195 struct m_ext {
196 	caddr_t	ext_buf;		/* start of buffer */
197 	void	(*ext_free)(void *);
198 	u_int	ext_size;		/* size of buffer, for ext_free */
199 	void	(*ext_ref)(void *);
200 	void	*ext_arg;
201 };
202 
203 /*
204  * The core of the mbuf object along with some shortcut defines for
205  * practical purposes.
206  */
207 struct mbuf {
208 	struct	m_hdr m_hdr;
209 	union {
210 		struct {
211 			struct	pkthdr MH_pkthdr;	/* M_PKTHDR set */
212 			union {
213 				struct	m_ext MH_ext;	/* M_EXT set */
214 				char	MH_databuf[MHLEN];
215 			} MH_dat;
216 		} MH;
217 		char	M_databuf[MLEN];		/* !M_PKTHDR, !M_EXT */
218 	} M_dat;
219 };
220 #define	m_next		m_hdr.mh_next
221 #define	m_len		m_hdr.mh_len
222 #define	m_data		m_hdr.mh_data
223 #define	m_type		m_hdr.mh_type
224 #define	m_flags		m_hdr.mh_flags
225 #define	m_nextpkt	m_hdr.mh_nextpkt
226 #define	m_stailqpkt	m_hdr.mh_stailqpkt
227 #define	m_pkthdr	M_dat.MH.MH_pkthdr
228 #define	m_ext		M_dat.MH.MH_dat.MH_ext
229 #define	m_pktdat	M_dat.MH.MH_dat.MH_databuf
230 #define	m_dat		M_dat.M_databuf
231 
232 /*
233  * Code that uses m_act should be converted to use m_nextpkt
234  * instead; m_act is historical and deprecated.
235  */
236 #define m_act   	m_nextpkt
237 
238 /*
239  * mbuf flags.
240  */
241 #define	M_EXT		0x0001	/* has associated external storage */
242 #define	M_PKTHDR	0x0002	/* start of record */
243 #define	M_EOR		0x0004	/* end of record */
244 #define	M_PROTO1	0x0008	/* protocol-specific */
245 #define	M_PROTO2	0x0010	/* protocol-specific */
246 #define	M_PROTO3	0x0020	/* protocol-specific */
247 #define	M_PROTO4	0x0040	/* protocol-specific */
248 #define	M_PROTO5	0x0080	/* protocol-specific */
249 
250 /*
251  * mbuf pkthdr flags (also stored in m_flags).
252  */
253 #define	M_BCAST		0x0100	/* send/received as link-level broadcast */
254 #define	M_MCAST		0x0200	/* send/received as link-level multicast */
255 #define	M_FRAG		0x0400	/* packet is a fragment of a larger packet */
256 #define	M_FIRSTFRAG	0x0800	/* packet is first fragment */
257 #define	M_LASTFRAG	0x1000	/* packet is last fragment */
258 #define	M_CLCACHE	0x2000	/* mbuf allocated from the cluster cache */
259 #define	M_EXT_CLUSTER	0x4000	/* standard cluster else special */
260 #define	M_PHCACHE	0x8000	/* mbuf allocated from the pkt header cache */
261 #define	M_UNUSED16	0x10000	/* was: notification event (SCTP) */
262 #define	M_VLANTAG	0x20000	/* ether_vlantag is valid */
263 #define	M_MPLSLABELED	0x40000	/* packet is mpls labeled */
264 #define	M_LENCHECKED	0x80000	/* packet proto lengths are checked */
265 #define	M_HASH		0x100000	/* hash field in pkthdr is valid */
266 #define	M_PROTO6	0x200000	/* protocol-specific */
267 #define	M_PROTO7	0x400000	/* protocol-specific */
268 #define	M_PROTO8	0x800000	/* protocol-specific */
269 #define	M_CKHASH	0x1000000	/* hash needs software verification */
270 #define	M_PRIO		0x2000000	/* high priority mbuf */
271 #define	M_SOLOCKED	0x4000000	/* locked by userland for read() */
272 
273 /*
274  * Flags to purge when crossing layers.
275  */
276 #define	M_PROTOFLAGS	(M_PROTO1|M_PROTO2|M_PROTO3|M_PROTO4|M_PROTO5 | \
277 			 M_PROTO6|M_PROTO7|M_PROTO8)
278 
279 /*
280  * Flags copied when copying m_pkthdr.
281  */
282 #define	M_COPYFLAGS	(M_PKTHDR|M_EOR|M_PROTOFLAGS | \
283 			 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \
284 			 M_VLANTAG|M_MPLSLABELED | \
285 			 M_LENCHECKED|M_HASH|M_CKHASH|M_PRIO)
286 
287 /*
288  * Flags indicating hw checksum support and sw checksum requirements.
289  */
290 #define	CSUM_IP			0x0001		/* will csum IP */
291 #define	CSUM_TCP		0x0002		/* will csum TCP */
292 #define	CSUM_UDP		0x0004		/* will csum UDP */
293 #define	CSUM_IP_FRAGS		0x0008		/* will csum IP fragments */
294 #define	CSUM_FRAGMENT		0x0010		/* will do IP fragmentation */
295 
296 #define	CSUM_IP_CHECKED		0x0100		/* did csum IP */
297 #define	CSUM_IP_VALID		0x0200		/*   ... the csum is valid */
298 #define	CSUM_DATA_VALID		0x0400		/* csum_data field is valid */
299 #define	CSUM_PSEUDO_HDR		0x0800		/* csum_data has pseudo hdr */
300 #define CSUM_FRAG_NOT_CHECKED	0x1000		/* did _not_ csum fragment
301 						 * NB: This flag is only used
302 						 * by IP defragmenter.
303 						 */
304 #define	CSUM_TSO		0x2000		/* will do TCP segmentation */
305 
306 #define	CSUM_DELAY_DATA		(CSUM_TCP | CSUM_UDP)
307 #define	CSUM_DELAY_IP		(CSUM_IP)	/* XXX add ipv6 here too? */
308 
309 /*
310  * Flags indicating PF processing status
311  */
312 #define	FW_MBUF_GENERATED	0x00000001
313 #define	PF_MBUF_STRUCTURE	0x00000002	/* m_pkthdr.pf valid */
314 #define	PF_MBUF_ROUTED		0x00000004	/* pf_routed field is valid */
315 #define	PF_MBUF_TAGGED		0x00000008
316 #define	IPFW_MBUF_CONTINUE	0x00000010
317 #define	XX_MBUF_UNUSED20	0x00000020
318 #define	IPFORWARD_MBUF_TAGGED	0x00000040
319 #define	DUMMYNET_MBUF_TAGGED	0x00000080
320 #define	BRIDGE_MBUF_TAGGED	0x00000100
321 #define	FW_MBUF_REDISPATCH	0x00000200
322 #define	FW_MBUF_PRIVATE1	0x00000400
323 #define	FW_MBUF_PRIVATE2	0x00000800
324 #define	IPFW_MBUF_GENERATED	FW_MBUF_GENERATED
325 
326 /*
327  * mbuf types.
328  */
329 #define	MT_FREE		0	/* should be on free list */
330 #define	MT_DATA		1	/* dynamic (data) allocation */
331 #define	MT_HEADER	2	/* packet header */
332 #define	MT_SONAME	3	/* socket name */
333 /* 4 was MT_TAG */
334 #define	MT_CONTROL	5	/* extra-data protocol message */
335 #define	MT_OOBDATA	6	/* expedited data  */
336 #define	MT_NTYPES	7	/* number of mbuf types for mbtypes[] */
337 
338 /*
339  * General mbuf allocator statistics structure.
340  *
341  * NOTE: Make sure this struct's size is multiple cache line size.
342  */
343 struct mbstat {
344 	u_long	m_mbufs;	/* mbufs obtained from page pool */
345 	u_long	m_clusters;	/* clusters obtained from page pool */
346 	u_long	m_jclusters;	/* jclusters obtained from page pool */
347 	u_long	m_clfree;	/* free clusters */
348 	u_long	m_drops;	/* times failed to find space */
349 	u_long	m_wait;		/* times waited for space */
350 	u_long	m_drain;	/* times drained protocols for space */
351 	u_long	m_mcfail;	/* times m_copym failed */
352 	u_long	m_mpfail;	/* times m_pullup failed */
353 	u_long	m_msize;	/* length of an mbuf */
354 	u_long	m_mclbytes;	/* length of an mbuf cluster */
355 	u_long	m_mjumpagesize;	/* length of a jumbo mbuf cluster */
356 	u_long	m_minclsize;	/* min length of data to allocate a cluster */
357 	u_long	m_mlen;		/* length of data in an mbuf */
358 	u_long	m_mhlen;	/* length of data in a header mbuf */
359 	u_long	m_pad;		/* pad to cache line size (64B) */
360 };
361 
362 /*
363  * objcache(9) ocflags sanitizing
364  */
365 #define	MB_OCFLAG(how)	((how) & M_WAITOK ? M_WAITOK : M_NOWAIT)
366 
367 /*
368  * These are identifying numbers passed to the m_mballoc_wait function,
369  * allowing us to determine whether the call came from an MGETHDR or
370  * an MGET.
371  */
372 #define	MGETHDR_C      1
373 #define	MGET_C         2
374 
375 /*
376  * mbuf allocation/deallocation macros (YYY deprecated, too big):
377  *
378  *	MGET(struct mbuf *m, int how, int type)
379  * allocates an mbuf and initializes it to contain internal data.
380  *
381  *	MGETHDR(struct mbuf *m, int how, int type)
382  * allocates an mbuf and initializes it to contain a packet header
383  * and internal data.
384  */
385 #define	MGET(m, how, type) do {						\
386 	(m) = m_get((how), (type));					\
387 } while (0)
388 
389 #define	MGETHDR(m, how, type) do {					\
390 	(m) = m_gethdr((how), (type));					\
391 } while (0)
392 
393 /*
394  * MCLGET adds such clusters to a normal mbuf.  The flag M_EXT is set upon
395  * success.
396  * Deprecated.  Use m_getcl() or m_getl() instead.
397  */
398 #define	MCLGET(m, how) do {						\
399 	m_mclget((m), (how));						\
400 } while (0)
401 
402 /*
403  * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
404  *     or m_dup_pkthdr.
405  */
406 /*
407  * Move mbuf pkthdr from "from" to "to".
408  * from should have M_PKTHDR set, and to must be empty.
409  * from no longer has a pkthdr after this operation.
410  */
411 #define	M_MOVE_PKTHDR(_to, _from)	m_move_pkthdr((_to), (_from))
412 
413 /*
414  * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
415  * an object of the specified size at the end of the mbuf, longword aligned.
416  */
417 #define	M_ALIGN(m, len) do {						\
418 	(m)->m_data += rounddown2(MLEN - (len), sizeof(long));		\
419 } while (0)
420 
421 /*
422  * As above, for mbufs allocated with m_gethdr/MGETHDR
423  * or initialized by M_COPY_PKTHDR.
424  */
425 #define	MH_ALIGN(m, len) do {						\
426 	(m)->m_data += rounddown2(MHLEN - (len), sizeof(long));		\
427 } while (0)
428 
429 /*
430  * Check if we can write to an mbuf.
431  */
432 #define	M_EXT_WRITABLE(m)	(m_sharecount(m) == 1)
433 #define	M_WRITABLE(m)		(!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
434 
435 /*
436  * Check if the supplied mbuf has a packet header, or else panic.
437  */
438 #define	M_ASSERTPKTHDR(m)						\
439 	KASSERT(m != NULL && m->m_flags & M_PKTHDR,			\
440 		("%s: invalid mbuf or no mbuf packet header!", __func__))
441 
442 /*
443  * Compute the amount of space available before the current start of data.
444  * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
445  * of checking writability of the mbuf data area rests solely with the caller.
446  */
447 #define	M_LEADINGSPACE(m)						\
448 	((m)->m_flags & M_EXT ?						\
449 	    (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0):	\
450 	    (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat :	\
451 	    (m)->m_data - (m)->m_dat)
452 
453 /*
454  * Compute the amount of space available after the end of data in an mbuf.
455  * The M_WRITABLE() is a temporary, conservative safety measure: the burden
456  * of checking writability of the mbuf data area rests solely with the caller.
457  */
458 #define	M_TRAILINGSPACE(m)						\
459 	((m)->m_flags & M_EXT ?						\
460 	    (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size	\
461 		- ((m)->m_data + (m)->m_len) : 0) :			\
462 	    &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
463 
464 /*
465  * Arrange to prepend space of size plen to mbuf m.
466  * If a new mbuf must be allocated, how specifies whether to wait.
467  * If how is M_NOWAIT and allocation fails, the original mbuf chain
468  * is freed and m is set to NULL.
469  */
470 #define	M_PREPEND(m, plen, how) do {					\
471 	struct mbuf **_mmp = &(m);					\
472 	struct mbuf *_mm = *_mmp;					\
473 	int _mplen = (plen);						\
474 	int __mhow = (how);						\
475 									\
476 	if (M_LEADINGSPACE(_mm) >= _mplen) {				\
477 		_mm->m_data -= _mplen;					\
478 		_mm->m_len += _mplen;					\
479 	} else								\
480 		_mm = m_prepend(_mm, _mplen, __mhow);			\
481 	if (_mm != NULL && (_mm->m_flags & M_PKTHDR))			\
482 		_mm->m_pkthdr.len += _mplen;				\
483 	*_mmp = _mm;							\
484 } while (0)
485 
486 /* Length to m_copym() to copy all. */
487 #define	M_COPYALL	1000000000
488 
489 /* Compatibility with 4.3 */
490 #define	m_copy(m, o, l)	m_copym((m), (o), (l), M_NOWAIT)
491 
492 #ifdef _KERNEL
493 
494 extern	u_int		 m_clalloc_wid;	/* mbuf cluster wait count */
495 extern	u_int		 m_mballoc_wid;	/* mbuf wait count */
496 extern	int		 max_linkhdr;	/* largest link-level header */
497 extern	int		 max_protohdr;	/* largest protocol header */
498 extern	int		 max_hdr;	/* largest link+protocol header */
499 extern	int		 max_datalen;	/* MHLEN - max_hdr */
500 extern	int		 nmbclusters;
501 extern	int		 nmbufs;
502 
503 struct uio;
504 
505 void		 mcl_inclimit(int);
506 void		 mjcl_inclimit(int);
507 void		 mb_inclimit(int);
508 void		 m_adj(struct mbuf *, int);
509 void		 m_align(struct mbuf *, int);
510 int		 m_apply(struct mbuf *, int, int,
511 		    int (*)(void *, void *, u_int), void *);
512 int		 m_append(struct mbuf *, int, const void *);
513 void		 m_cat(struct mbuf *, struct mbuf *);
514 u_int		 m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
515 void		 m_copyback(struct mbuf *, int, int, const void *);
516 int		 m_copyback2(struct mbuf *, int, int, const void *, int);
517 void		 m_copydata(const struct mbuf *, int, int, void *);
518 struct	mbuf	*m_copym(const struct mbuf *, int, int, int);
519 struct	mbuf	*m_copypacket(struct mbuf *, int);
520 struct	mbuf	*m_defrag(struct mbuf *, int);
521 struct	mbuf	*m_defrag_nofree(struct mbuf *, int);
522 struct	mbuf	*m_devget(void *, int, int, struct ifnet *);
523 struct	mbuf	*m_dup(struct mbuf *, int);
524 struct	mbuf	*m_dup_data(struct mbuf *, int);
525 int		 m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
526 void		 m_extadd(struct mbuf *, void *, u_int, void (*)(void *),
527 		    void (*)(void *), void *);
528 #ifdef MBUF_DEBUG
529 struct	mbuf	*_m_free(struct mbuf *, const char *name);
530 void		 _m_freem(struct mbuf *, const char *name);
531 #else
532 struct	mbuf	*m_free(struct mbuf *);
533 void		 m_freem(struct mbuf *);
534 #endif
535 struct	mbuf	*m_get(int, int);
536 struct	mbuf	*m_getc(int len, int how, int type);
537 struct	mbuf	*m_getcl(int how, short type, int flags);
538 struct	mbuf	*m_getjcl(int how, short type, int flags, size_t size);
539 struct	mbuf	*m_getclr(int, int);
540 struct	mbuf	*m_gethdr(int, int);
541 struct	mbuf	*m_getm(struct mbuf *, int, int, int);
542 struct	mbuf	*m_getptr(struct mbuf *, int, int *);
543 struct	mbuf	*m_last(struct mbuf *m);
544 u_int		 m_lengthm(struct mbuf *m, struct mbuf **lastm);
545 void		 m_move_pkthdr(struct mbuf *, struct mbuf *);
546 struct	mbuf	*m_prepend(struct mbuf *, int, int);
547 void		 m_print(const struct mbuf *m);
548 struct	mbuf	*m_pulldown(struct mbuf *, int, int, int *);
549 struct	mbuf	*m_pullup(struct mbuf *, int);
550 struct	mbuf	*m_split(struct mbuf *, int, int);
551 struct	mbuf 	*m_uiomove(struct uio *);
552 struct	mbuf	*m_unshare(struct mbuf *, int);
553 void		m_mclget(struct mbuf *m, int how);
554 int		m_sharecount(struct mbuf *m);
555 void		m_chtype(struct mbuf *m, int type);
556 int		m_devpad(struct mbuf *m, int padto);
557 
558 #ifdef MBUF_DEBUG
559 
560 void		mbuftrackid(struct mbuf *, int);
561 
562 #define m_free(m)	_m_free(m, __func__)
563 #define m_freem(m)	_m_freem(m, __func__)
564 
565 #else
566 
567 #define mbuftrackid(m, id)	/* empty */
568 
569 #endif
570 
571 static __inline void
572 m_sethash(struct mbuf *m, uint16_t hash)
573 {
574 	m->m_flags |= M_HASH;
575 	m->m_pkthdr.hash = hash;
576 }
577 
578 /*
579  * Allocate the right type of mbuf for the desired total length.
580  * The mbuf returned does not necessarily cover the entire requested length.
581  * This function follows mbuf chaining policy of allowing MINCLSIZE
582  * amount of chained mbufs.
583  */
584 static __inline struct mbuf *
585 m_getl(int len, int how, int type, int flags, int *psize)
586 {
587 	struct mbuf *m;
588 	int size;
589 
590 	if (len >= MINCLSIZE) {
591 		m = m_getcl(how, type, flags);
592 		size = MCLBYTES;
593 	} else if (flags & M_PKTHDR) {
594 		m = m_gethdr(how, type);
595 		size = MHLEN;
596 	} else {
597 		m = m_get(how, type);
598 		size = MLEN;
599 	}
600 	if (psize != NULL)
601 		*psize = size;
602 	return (m);
603 }
604 
605 static __inline struct mbuf *
606 m_getlj(int len, int how, int type, int flags, int *psize)
607 {
608 	if (len > MCLBYTES) {
609 		struct mbuf *m;
610 
611 		m = m_getjcl(how, type, flags, MJUMPAGESIZE);
612 		if (psize != NULL)
613 			*psize = MJUMPAGESIZE;
614 		return m;
615 	}
616 	return m_getl(len, how, type, flags, psize);
617 }
618 
619 /*
620  * Get a single mbuf that covers the requested number of bytes.
621  * This function does not create mbuf chains.  It explicitly marks
622  * places in the code that abuse mbufs for contiguous data buffers.
623  */
624 static __inline struct mbuf *
625 m_getb(int len, int how, int type, int flags)
626 {
627 	struct mbuf *m;
628 	int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
629 
630 	if (len > mbufsize)
631 		m = m_getcl(how, type, flags);
632 	else if (flags & M_PKTHDR)
633 		m = m_gethdr(how, type);
634 	else
635 		m = m_get(how, type);
636 	return (m);
637 }
638 
639 
640 /*
641  * Mbuf tags
642  *
643  * Packets may have annotations attached by affixing a list
644  * of "packet tags" to the pkthdr structure.  Packet tags are
645  * dynamically allocated semi-opaque data structures that have
646  * a fixed header (struct m_tag) that specifies the size of the
647  * memory block and a <cookie,type> pair that identifies it.
648  * The cookie is a 32-bit unique unsigned value used to identify
649  * a module or ABI.  By convention this value is chose as the
650  * date+time that the module is created, expressed as the number of
651  * seconds since the epoch (e.g. using date -u +'%s').  The type value
652  * is an ABI/module-specific value that identifies a particular annotation
653  * and is private to the module.  For compatibility with systems
654  * like openbsd that define packet tags w/o an ABI/module cookie,
655  * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
656  * m_tag_find compatibility shim functions and several tag types are
657  * defined below.  Users that do not require compatibility should use
658  * a private cookie value so that packet tag-related definitions
659  * can be maintained privately.
660  *
661  * Note that the packet tag returned by m_tag_alloc has the default
662  * memory alignment implemented by kmalloc.  To reference private data
663  * one can use a construct like:
664  *
665  *	struct m_tag *mtag = m_tag_alloc(...);
666  *	struct foo *p = m_tag_data(mtag);
667  *
668  * if the alignment of struct m_tag is sufficient for referencing members
669  * of struct foo.  Otherwise it is necessary to embed struct m_tag within
670  * the private data structure to insure proper alignment; e.g.
671  *
672  *	struct foo {
673  *		struct m_tag	tag;
674  *		...
675  *	};
676  *	struct foo *p = (struct foo *)m_tag_alloc(...);
677  *	struct m_tag *mtag = &p->tag;
678  */
679 
680 #define	PACKET_TAG_NONE		0  /* Nadda */
681 #define	PACKET_TAG_ENCAP	6 /* Encap. processing */
682 				/* struct ifnet *, the GIF interface */
683 #define	PACKET_TAG_IPV6_INPUT	8 /* IPV6 input processing */
684 				/* struct ip6aux */
685 #define	PACKET_TAG_IPFW_DIVERT	9 /* divert info */
686 				/* struct divert_info */
687 #define	PACKET_TAG_DUMMYNET	15 /* dummynet info */
688 				/* struct dn_pkt */
689 #define	PACKET_TAG_IPFORWARD	18 /* ipforward info */
690 				/* struct sockaddr_in */
691 #define PACKET_TAG_IPSRCRT	27 /* IP srcrt opts */
692 				/* struct ip_srcrt_opt */
693 #define	PACKET_TAG_CARP		28 /* CARP info */
694 				/* struct ifnet */
695 #define	PACKET_TAG_PF		29 /* PF info */
696 				/* struct pf_mtag */
697 #define	PACKET_TAG_PF_DIVERT	0x0200 /* pf(4) diverted packet */
698 
699 /* Packet tag routines */
700 struct	m_tag 	*m_tag_alloc(uint32_t, int, int, int);
701 void		 m_tag_free(struct m_tag *);
702 void		 m_tag_prepend(struct mbuf *, struct m_tag *);
703 void		 m_tag_unlink(struct mbuf *, struct m_tag *);
704 void		 m_tag_delete(struct mbuf *, struct m_tag *);
705 void		 m_tag_delete_chain(struct mbuf *);
706 struct	m_tag	*m_tag_locate(struct mbuf *, uint32_t, int, struct m_tag *);
707 struct	m_tag	*m_tag_copy(struct m_tag *, int);
708 int		 m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
709 void		 m_tag_init(struct mbuf *);
710 struct	m_tag	*m_tag_first(struct mbuf *);
711 struct	m_tag	*m_tag_next(struct mbuf *, struct m_tag *);
712 
713 /* these are for openbsd compatibility */
714 #define	MTAG_ABI_COMPAT		0		/* compatibility ABI */
715 
716 static __inline void *
717 m_tag_data(struct m_tag *tag)
718 {
719 	return ((void *)(tag + 1));
720 }
721 
722 static __inline struct m_tag *
723 m_tag_get(int type, int length, int mflags)
724 {
725 	return m_tag_alloc(MTAG_ABI_COMPAT, type, length, mflags);
726 }
727 
728 static __inline struct m_tag *
729 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
730 {
731 	return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
732 }
733 
734 
735 /*
736  * Mbuf queue routines
737  */
738 
739 struct mbufq {
740 	STAILQ_HEAD(, mbuf)	mq_head;
741 	int			mq_len;
742 	int			mq_maxlen;
743 };
744 
745 static inline void
746 mbufq_init(struct mbufq *mq, int maxlen)
747 {
748 	STAILQ_INIT(&mq->mq_head);
749 	mq->mq_maxlen = maxlen;
750 	mq->mq_len = 0;
751 }
752 
753 static inline struct mbuf *
754 mbufq_flush(struct mbufq *mq)
755 {
756 	struct mbuf *m;
757 
758 	m = STAILQ_FIRST(&mq->mq_head);
759 	STAILQ_INIT(&mq->mq_head);
760 	mq->mq_len = 0;
761 	return (m);
762 }
763 
764 static inline void
765 mbufq_drain(struct mbufq *mq)
766 {
767 	struct mbuf *m, *n;
768 
769 	n = mbufq_flush(mq);
770 	while ((m = n) != NULL) {
771 		n = STAILQ_NEXT(m, m_stailqpkt);
772 		m_freem(m);
773 	}
774 }
775 
776 static inline struct mbuf *
777 mbufq_first(const struct mbufq *mq)
778 {
779 	return (STAILQ_FIRST(&mq->mq_head));
780 }
781 
782 static inline struct mbuf *
783 mbufq_last(const struct mbufq *mq)
784 {
785 	return (STAILQ_LAST(&mq->mq_head, mbuf, m_stailqpkt));
786 }
787 
788 static inline int
789 mbufq_full(const struct mbufq *mq)
790 {
791 	return (mq->mq_len >= mq->mq_maxlen);
792 }
793 
794 static inline int
795 mbufq_len(const struct mbufq *mq)
796 {
797 	return (mq->mq_len);
798 }
799 
800 static inline int
801 mbufq_enqueue(struct mbufq *mq, struct mbuf *m)
802 {
803 	if (mbufq_full(mq))
804 		return (ENOBUFS);
805 	STAILQ_INSERT_TAIL(&mq->mq_head, m, m_stailqpkt);
806 	mq->mq_len++;
807 	return (0);
808 }
809 
810 static inline struct mbuf *
811 mbufq_dequeue(struct mbufq *mq)
812 {
813 	struct mbuf *m;
814 
815 	m = STAILQ_FIRST(&mq->mq_head);
816 	if (m) {
817 		STAILQ_REMOVE_HEAD(&mq->mq_head, m_stailqpkt);
818 		m->m_nextpkt = NULL;
819 		mq->mq_len--;
820 	}
821 	return (m);
822 }
823 
824 static inline void
825 mbufq_prepend(struct mbufq *mq, struct mbuf *m)
826 {
827 	STAILQ_INSERT_HEAD(&mq->mq_head, m, m_stailqpkt);
828 	mq->mq_len++;
829 }
830 
831 #endif	/* _KERNEL */
832 
833 #endif	/* _KERNEL || _KERNEL_STRUCTURES */
834 #endif	/* !_SYS_MBUF_H_ */
835