2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
4 * Copyright (c) 1982, 1986, 1988, 1993
5 * The Regents of the University of California. All rights reserved.
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17 * This product includes software developed by the University of
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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 * $DragonFly: src/sys/sys/mbuf.h,v 1.54 2008/10/19 08:39:55 sephe Exp $
43 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
46 #include <sys/types.h>
49 #include <sys/param.h>
52 #include <sys/queue.h>
54 #ifndef _NET_NETISR_H_
55 #include <net/netisr.h>
59 * Mbufs are of a single size, MSIZE (machine/param.h), which
60 * includes overhead. An mbuf may add a single "mbuf cluster" of size
61 * MCLBYTES (also in machine/param.h), which has no additional overhead
62 * and is used instead of the internal data area; this is done when
63 * at least MINCLSIZE of data must be stored.
65 #define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */
66 #define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */
67 #define MINCLSIZE (MHLEN + 1) /* smallest amount to put in cluster */
68 #define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */
71 * Macros for type conversion:
72 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type.
73 * mtocl(x) - convert pointer within cluster to cluster index #
74 * cltom(x) - convert cluster # to ptr to beginning of cluster
76 #define mtod(m, t) ((t)((m)->m_data))
77 #define mtodoff(m, t, off) ((t)((m)->m_data + (off)))
80 * Header present at the beginning of every mbuf.
83 struct mbuf *mh_next; /* next buffer in chain */
84 struct mbuf *mh_nextpkt; /* next chain in queue/record */
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 */
91 const char *mh_lastfunc;
93 struct netmsg_packet mh_netmsg; /* hardware->proto stack msg */
98 void *hdr; /* saved hdr pos in mbuf, for ECN */
99 u_int rtableid; /* alternate routing table id */
100 u_int32_t qid; /* queue id */
101 u_int16_t tag; /* tag id */
104 uint32_t state_hash; /* identifies 'connections' */
105 uint8_t ecn_af; /* for altq_red */
112 * Packet tag structure (see below for details).
115 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
116 u_int16_t m_tag_id; /* Tag ID */
117 u_int16_t m_tag_len; /* Length of data */
118 u_int32_t m_tag_cookie; /* ABI/Module ID */
121 SLIST_HEAD(packet_tags, m_tag);
124 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
126 * Be careful: The fields have been carefully ordered to avoid hidden padding.
127 * Keep this in mind, when adding or removing fields!
130 struct ifnet *rcvif; /* rcv interface */
131 int len; /* total packet length */
132 struct packet_tags tags; /* list of packet tags */
134 /* variables for ip and tcp reassembly */
135 void *header; /* pointer to packet header */
137 /* variables for hardware checksum */
138 int csum_flags; /* flags regarding checksum */
139 int csum_data; /* data field used by csum routines */
142 uint32_t fw_flags; /* flags for PF */
144 /* variables for PF processing */
145 struct pkthdr_pf pf; /* structure for PF */
147 uint16_t ether_vlantag; /* ethernet 802.1p+q vlan tag */
148 uint16_t hash; /* packet hash */
150 uint16_t wlan_seqno; /* IEEE 802.11 seq no. */
154 * Description of external storage mapped into mbuf; valid only if M_EXT is set.
157 caddr_t ext_buf; /* start of buffer */
158 void (*ext_free)(void *);
159 u_int ext_size; /* size of buffer, for ext_free */
160 void (*ext_ref)(void *);
165 * The core of the mbuf object along with some shortcut defines for
166 * practical purposes.
172 struct pkthdr MH_pkthdr; /* M_PKTHDR set */
174 struct m_ext MH_ext; /* M_EXT set */
175 char MH_databuf[MHLEN];
178 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
181 #define m_next m_hdr.mh_next
182 #define m_len m_hdr.mh_len
183 #define m_data m_hdr.mh_data
184 #define m_type m_hdr.mh_type
185 #define m_flags m_hdr.mh_flags
186 #define m_nextpkt m_hdr.mh_nextpkt
187 #define m_pkthdr M_dat.MH.MH_pkthdr
188 #define m_ext M_dat.MH.MH_dat.MH_ext
189 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
190 #define m_dat M_dat.M_databuf
193 * Code that uses m_act should be converted to use m_nextpkt
194 * instead; m_act is historical and deprecated.
196 #define m_act m_nextpkt
201 #define M_EXT 0x0001 /* has associated external storage */
202 #define M_PKTHDR 0x0002 /* start of record */
203 #define M_EOR 0x0004 /* end of record */
204 #define M_PROTO1 0x0008 /* protocol-specific */
205 #define M_PROTO2 0x0010 /* protocol-specific */
206 #define M_PROTO3 0x0020 /* protocol-specific */
207 #define M_PROTO4 0x0040 /* protocol-specific */
208 #define M_PROTO5 0x0080 /* protocol-specific */
211 * mbuf pkthdr flags (also stored in m_flags).
213 #define M_BCAST 0x0100 /* send/received as link-level broadcast */
214 #define M_MCAST 0x0200 /* send/received as link-level multicast */
215 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */
216 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */
217 #define M_LASTFRAG 0x1000 /* packet is last fragment */
218 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */
219 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */
220 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */
221 #define M_NOTIFICATION 0x10000 /* notification event */
222 #define M_VLANTAG 0x20000 /* ether_vlantag is valid */
223 #define M_MPLSLABELED 0x40000 /* packet is mpls labeled */
224 #define M_LENCHECKED 0x80000 /* packet proto lengths are checked */
225 #define M_HASH 0x100000/* hash field in pkthdr is valid */
226 #define M_PROTO6 0x200000/* protocol-specific */
227 #define M_PROTO7 0x400000/* protocol-specific */
228 #define M_PROTO8 0x800000/* protocol-specific */
231 * Flags copied when copying m_pkthdr.
233 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO2|M_PROTO3 | \
234 M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8 | \
235 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \
236 M_VLANTAG|M_MPLSLABELED | \
240 * Flags indicating hw checksum support and sw checksum requirements.
242 #define CSUM_IP 0x0001 /* will csum IP */
243 #define CSUM_TCP 0x0002 /* will csum TCP */
244 #define CSUM_UDP 0x0004 /* will csum UDP */
245 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
246 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
248 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
249 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
250 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
251 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
252 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment
253 * NB: This flag is only used
254 * by IP defragmenter.
257 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
258 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
261 * Flags indicating PF processing status
263 #define FW_MBUF_GENERATED 0x00000001
264 #define PF_MBUF_STRUCTURE 0x00000002 /* m_pkthdr.pf valid */
265 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */
266 #define PF_MBUF_TAGGED 0x00000008
267 #define XX_MBUF_UNUSED10 0x00000010
268 #define XX_MBUF_UNUSED20 0x00000020
269 #define IPFORWARD_MBUF_TAGGED 0x00000040
270 #define DUMMYNET_MBUF_TAGGED 0x00000080
271 #define XX_MBUF_UNUSED100 0x00000100
272 #define FW_MBUF_REDISPATCH 0x00000200
273 #define IPFW_MBUF_GENERATED FW_MBUF_GENERATED
277 #define MT_FREE 0 /* should be on free list */
278 #define MT_DATA 1 /* dynamic (data) allocation */
279 #define MT_HEADER 2 /* packet header */
280 #define MT_SONAME 3 /* socket name */
282 #define MT_CONTROL 5 /* extra-data protocol message */
283 #define MT_OOBDATA 6 /* expedited data */
284 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */
287 struct mbuf *mc_head;
288 struct mbuf *mc_tail;
292 * General mbuf allocator statistics structure.
295 u_long m_mbufs; /* mbufs obtained from page pool */
296 u_long m_clusters; /* clusters obtained from page pool */
297 u_long m_spare; /* spare field */
298 u_long m_clfree; /* free clusters */
299 u_long m_drops; /* times failed to find space */
300 u_long m_wait; /* times waited for space */
301 u_long m_drain; /* times drained protocols for space */
302 u_long m_mcfail; /* times m_copym failed */
303 u_long m_mpfail; /* times m_pullup failed */
304 u_long m_msize; /* length of an mbuf */
305 u_long m_mclbytes; /* length of an mbuf cluster */
306 u_long m_minclsize; /* min length of data to allocate a cluster */
307 u_long m_mlen; /* length of data in an mbuf */
308 u_long m_mhlen; /* length of data in a header mbuf */
312 * Flags specifying how an allocation should be made.
315 #define MB_DONTWAIT 0x4
316 #define MB_TRYWAIT 0x8
317 #define MB_WAIT MB_TRYWAIT
320 * Mbuf to Malloc Flag Conversion.
322 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT)
325 * These are identifying numbers passed to the m_mballoc_wait function,
326 * allowing us to determine whether the call came from an MGETHDR or
333 * mbuf allocation/deallocation macros (YYY deprecated, too big):
335 * MGET(struct mbuf *m, int how, int type)
336 * allocates an mbuf and initializes it to contain internal data.
338 * MGETHDR(struct mbuf *m, int how, int type)
339 * allocates an mbuf and initializes it to contain a packet header
342 #define MGET(m, how, type) do { \
343 (m) = m_get((how), (type)); \
346 #define MGETHDR(m, how, type) do { \
347 (m) = m_gethdr((how), (type)); \
351 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon
353 * Deprecated. Use m_getcl() or m_getl() instead.
355 #define MCLGET(m, how) do { \
356 m_mclget((m), (how)); \
360 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
364 * Move mbuf pkthdr from "from" to "to".
365 * from should have M_PKTHDR set, and to must be empty.
366 * from no longer has a pkthdr after this operation.
368 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from))
371 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
372 * an object of the specified size at the end of the mbuf, longword aligned.
374 #define M_ALIGN(m, len) do { \
375 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
379 * As above, for mbufs allocated with m_gethdr/MGETHDR
380 * or initialized by M_COPY_PKTHDR.
382 #define MH_ALIGN(m, len) do { \
383 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
387 * Check if we can write to an mbuf.
389 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1)
390 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
393 * Check if the supplied mbuf has a packet header, or else panic.
395 #define M_ASSERTPKTHDR(m) \
396 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \
397 ("%s: invalid mbuf or no mbuf packet header!", __func__))
400 * Compute the amount of space available before the current start of data.
401 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
402 * of checking writability of the mbuf data area rests solely with the caller.
404 #define M_LEADINGSPACE(m) \
405 ((m)->m_flags & M_EXT ? \
406 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
407 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
408 (m)->m_data - (m)->m_dat)
411 * Compute the amount of space available after the end of data in an mbuf.
412 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
413 * of checking writability of the mbuf data area rests solely with the caller.
415 #define M_TRAILINGSPACE(m) \
416 ((m)->m_flags & M_EXT ? \
417 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
418 - ((m)->m_data + (m)->m_len) : 0) : \
419 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
422 * Arrange to prepend space of size plen to mbuf m.
423 * If a new mbuf must be allocated, how specifies whether to wait.
424 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain
425 * is freed and m is set to NULL.
427 #define M_PREPEND(m, plen, how) do { \
428 struct mbuf **_mmp = &(m); \
429 struct mbuf *_mm = *_mmp; \
430 int _mplen = (plen); \
431 int __mhow = (how); \
433 if (M_LEADINGSPACE(_mm) >= _mplen) { \
434 _mm->m_data -= _mplen; \
435 _mm->m_len += _mplen; \
437 _mm = m_prepend(_mm, _mplen, __mhow); \
438 if (_mm != NULL && (_mm->m_flags & M_PKTHDR)) \
439 _mm->m_pkthdr.len += _mplen; \
443 /* Length to m_copy to copy all. */
444 #define M_COPYALL 1000000000
446 /* Compatibility with 4.3 */
447 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT)
450 extern u_int m_clalloc_wid; /* mbuf cluster wait count */
451 extern u_int m_mballoc_wid; /* mbuf wait count */
452 extern int max_linkhdr; /* largest link-level header */
453 extern int max_protohdr; /* largest protocol header */
454 extern int max_hdr; /* largest link+protocol header */
455 extern int max_datalen; /* MHLEN - max_hdr */
456 extern int mbuf_wait; /* mbuf sleep time */
457 extern int nmbclusters;
462 void m_adj(struct mbuf *, int);
463 void m_align(struct mbuf *, int);
464 int m_apply(struct mbuf *, int, int,
465 int (*)(void *, void *, u_int), void *);
466 int m_append(struct mbuf *, int, c_caddr_t);
467 void m_cat(struct mbuf *, struct mbuf *);
468 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
469 void m_copyback(struct mbuf *, int, int, caddr_t);
470 void m_copydata(const struct mbuf *, int, int, caddr_t);
471 struct mbuf *m_copym(const struct mbuf *, int, int, int);
472 struct mbuf *m_copypacket(struct mbuf *, int);
473 struct mbuf *m_defrag(struct mbuf *, int);
474 struct mbuf *m_defrag_nofree(struct mbuf *, int);
475 struct mbuf *m_devget(char *, int, int, struct ifnet *,
476 void (*copy)(volatile const void *, volatile void *, size_t));
477 struct mbuf *m_dup(struct mbuf *, int);
478 struct mbuf *m_dup_data(struct mbuf *, int);
479 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
481 struct mbuf *_m_free(struct mbuf *, const char *name);
482 void _m_freem(struct mbuf *, const char *name);
484 struct mbuf *m_free(struct mbuf *);
485 void m_freem(struct mbuf *);
487 struct mbuf *m_get(int, int);
488 struct mbuf *m_getc(int len, int how, int type);
489 struct mbuf *m_getcl(int how, short type, int flags);
490 struct mbuf *m_getclr(int, int);
491 struct mbuf *m_gethdr(int, int);
492 struct mbuf *m_getm(struct mbuf *, int, int, int);
493 struct mbuf *m_getptr(struct mbuf *, int, int *);
494 struct mbuf *m_last(struct mbuf *m);
495 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm);
496 void m_move_pkthdr(struct mbuf *, struct mbuf *);
497 struct mbuf *m_prepend(struct mbuf *, int, int);
498 void m_print(const struct mbuf *m);
499 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
500 struct mbuf *m_pullup(struct mbuf *, int);
501 struct mbuf *m_split(struct mbuf *, int, int);
502 struct mbuf *m_uiomove(struct uio *);
503 void m_mclget(struct mbuf *m, int how);
504 int m_sharecount(struct mbuf *m);
505 void m_chtype(struct mbuf *m, int type);
506 int m_devpad(struct mbuf *m, int padto);
510 void mbuftrackid(struct mbuf *, int);
512 #define m_free(m) _m_free(m, __func__)
513 #define m_freem(m) _m_freem(m, __func__)
517 #define mbuftrackid(m, id) /* empty */
522 * Allocate the right type of mbuf for the desired total length.
523 * The mbuf returned does not necessarily cover the entire requested length.
524 * This function follows mbuf chaining policy of allowing MINCLSIZE
525 * amount of chained mbufs.
527 static __inline struct mbuf *
528 m_getl(int len, int how, int type, int flags, int *psize)
533 if (len >= MINCLSIZE) {
534 m = m_getcl(how, type, flags);
536 } else if (flags & M_PKTHDR) {
537 m = m_gethdr(how, type);
540 m = m_get(how, type);
549 * Get a single mbuf that covers the requested number of bytes.
550 * This function does not create mbuf chains. It explicitly marks
551 * places in the code that abuse mbufs for contiguous data buffers.
553 static __inline struct mbuf *
554 m_getb(int len, int how, int type, int flags)
557 int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
560 m = m_getcl(how, type, flags);
561 else if (flags & M_PKTHDR)
562 m = m_gethdr(how, type);
564 m = m_get(how, type);
569 * Packets may have annotations attached by affixing a list
570 * of "packet tags" to the pkthdr structure. Packet tags are
571 * dynamically allocated semi-opaque data structures that have
572 * a fixed header (struct m_tag) that specifies the size of the
573 * memory block and a <cookie,type> pair that identifies it.
574 * The cookie is a 32-bit unique unsigned value used to identify
575 * a module or ABI. By convention this value is chose as the
576 * date+time that the module is created, expressed as the number of
577 * seconds since the epoch (e.g. using date -u +'%s'). The type value
578 * is an ABI/module-specific value that identifies a particular annotation
579 * and is private to the module. For compatibility with systems
580 * like openbsd that define packet tags w/o an ABI/module cookie,
581 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
582 * m_tag_find compatibility shim functions and several tag types are
583 * defined below. Users that do not require compatibility should use
584 * a private cookie value so that packet tag-related definitions
585 * can be maintained privately.
587 * Note that the packet tag returned by m_tag_alloc has the default
588 * memory alignment implemented by kmalloc. To reference private data
589 * one can use a construct like:
591 * struct m_tag *mtag = m_tag_alloc(...);
592 * struct foo *p = m_tag_data(mtag);
594 * if the alignment of struct m_tag is sufficient for referencing members
595 * of struct foo. Otherwise it is necessary to embed struct m_tag within
596 * the private data structure to insure proper alignment; e.g.
602 * struct foo *p = (struct foo *)m_tag_alloc(...);
603 * struct m_tag *mtag = &p->tag;
606 #define PACKET_TAG_NONE 0 /* Nadda */
608 /* Packet tag for use with PACKET_ABI_COMPAT */
609 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
610 /* struct tdb_indent */
611 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
612 /* struct tdb_indent */
613 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
614 /* struct tdb_indent, never added */
615 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
616 /* struct tdb_indent, never added */
617 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */
618 /* struct tdb_indent, never added */
619 #define PACKET_TAG_ENCAP 6 /* Encap. processing */
620 /* struct ifnet *, the GIF interface */
621 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */
622 /* struct ipsec_history */
623 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */
625 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
626 /* struct divert_info */
627 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
629 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
630 /* struct sockaddr_in */
631 #define PACKET_TAG_IPSRCRT 27 /* IP srcrt opts */
632 /* struct ip_srcrt_opt */
633 #define PACKET_TAG_CARP 28 /* CARP info */
635 #define PACKET_TAG_PF 29 /* PF info */
637 /* Packet tag routines */
638 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
639 void m_tag_free(struct m_tag *);
640 void m_tag_prepend(struct mbuf *, struct m_tag *);
641 void m_tag_unlink(struct mbuf *, struct m_tag *);
642 void m_tag_delete(struct mbuf *, struct m_tag *);
643 void m_tag_delete_chain(struct mbuf *);
644 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
645 struct m_tag *m_tag_copy(struct m_tag *, int);
646 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
647 void m_tag_init(struct mbuf *);
648 struct m_tag *m_tag_first(struct mbuf *);
649 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *);
651 /* these are for openbsd compatibility */
652 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
654 static __inline void *
655 m_tag_data(struct m_tag *tag)
657 return ((void *)(tag + 1));
660 static __inline struct m_tag *
661 m_tag_get(int type, int length, int wait)
663 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
666 static __inline struct m_tag *
667 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
669 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
674 #endif /* _KERNEL || _KERNEL_STRUCTURES */
675 #endif /* !_SYS_MBUF_H_ */