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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8 * modification, are permitted provided that the following conditions
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
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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
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32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 1.48 2008/05/02 07:40:32 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))
79 * Header present at the beginning of every mbuf.
82 struct mbuf
*mh_next
; /* next buffer in chain */
83 struct mbuf
*mh_nextpkt
; /* next chain in queue/record */
84 caddr_t mh_data
; /* location of data */
85 int mh_len
; /* amount of data in this mbuf */
86 int mh_flags
; /* flags; see below */
87 short mh_type
; /* type of data in this mbuf */
88 short mh_pad
; /* padding */
89 struct netmsg_packet mh_netmsg
; /* hardware->proto stack msg */
93 * Packet tag structure (see below for details).
96 SLIST_ENTRY(m_tag
) m_tag_link
; /* List of packet tags */
97 u_int16_t m_tag_id
; /* Tag ID */
98 u_int16_t m_tag_len
; /* Length of data */
99 u_int32_t m_tag_cookie
; /* ABI/Module ID */
102 SLIST_HEAD(packet_tags
, m_tag
);
105 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
107 * Be careful: The fields have been carefully ordered to avoid hidden padding.
108 * Keep this in mind, when adding or removing fields!
111 struct ifnet
*rcvif
; /* rcv interface */
112 int len
; /* total packet length */
113 struct packet_tags tags
; /* list of packet tags */
115 /* variables for ip and tcp reassembly */
116 void *header
; /* pointer to packet header */
118 /* variables for hardware checksum */
119 int csum_flags
; /* flags regarding checksum */
120 int csum_data
; /* data field used by csum routines */
123 uint32_t fw_flags
; /* flags for PF */
125 /* variables for PF processing */
126 uint16_t pf_tag
; /* PF tag id */
127 uint8_t pf_routed
; /* PF routing counter */
129 /* variables for ALTQ processing */
130 uint8_t ecn_af
; /* address family for ECN */
131 uint32_t altq_qid
; /* queue id */
132 uint32_t altq_state_hash
; /* identifies 'connections' */
134 uint16_t ether_vlantag
; /* ethernet 802.1p+q vlan tag */
135 uint16_t pad
; /* explicit padding */
139 * Description of external storage mapped into mbuf; valid only if M_EXT is set.
142 caddr_t ext_buf
; /* start of buffer */
143 void (*ext_free
)(void *);
144 u_int ext_size
; /* size of buffer, for ext_free */
145 void (*ext_ref
)(void *);
150 * The core of the mbuf object along with some shortcut defines for
151 * practical purposes.
157 struct pkthdr MH_pkthdr
; /* M_PKTHDR set */
159 struct m_ext MH_ext
; /* M_EXT set */
160 char MH_databuf
[MHLEN
];
163 char M_databuf
[MLEN
]; /* !M_PKTHDR, !M_EXT */
166 #define m_next m_hdr.mh_next
167 #define m_len m_hdr.mh_len
168 #define m_data m_hdr.mh_data
169 #define m_type m_hdr.mh_type
170 #define m_flags m_hdr.mh_flags
171 #define m_nextpkt m_hdr.mh_nextpkt
172 #define m_pkthdr M_dat.MH.MH_pkthdr
173 #define m_ext M_dat.MH.MH_dat.MH_ext
174 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
175 #define m_dat M_dat.M_databuf
178 * Code that uses m_act should be converted to use m_nextpkt
179 * instead; m_act is historical and deprecated.
181 #define m_act m_nextpkt
186 #define M_EXT 0x0001 /* has associated external storage */
187 #define M_PKTHDR 0x0002 /* start of record */
188 #define M_EOR 0x0004 /* end of record */
189 #define M_PROTO1 0x0008 /* protocol-specific */
190 #define M_PROTO2 0x0010 /* protocol-specific */
191 #define M_PROTO3 0x0020 /* protocol-specific */
192 #define M_PROTO4 0x0040 /* protocol-specific */
193 #define M_PROTO5 0x0080 /* protocol-specific */
196 * mbuf pkthdr flags (also stored in m_flags).
198 #define M_BCAST 0x0100 /* send/received as link-level broadcast */
199 #define M_MCAST 0x0200 /* send/received as link-level multicast */
200 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */
201 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */
202 #define M_LASTFRAG 0x1000 /* packet is last fragment */
203 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */
204 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */
205 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */
206 #define M_NOTIFICATION 0x10000 /* notification event */
207 #define M_VLANTAG 0x20000 /* ether_vlantag is valid */
210 * Flags copied when copying m_pkthdr.
212 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \
213 M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG | \
214 M_FIRSTFRAG|M_LASTFRAG|M_VLANTAG)
217 * Flags indicating hw checksum support and sw checksum requirements.
219 #define CSUM_IP 0x0001 /* will csum IP */
220 #define CSUM_TCP 0x0002 /* will csum TCP */
221 #define CSUM_UDP 0x0004 /* will csum UDP */
222 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
223 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
225 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
226 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
227 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
228 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
229 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment
230 * NB: This flag is only used
231 * by IP defragmenter.
234 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
235 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
238 * Flags indicating PF processing status
240 #define FW_MBUF_GENERATED 0x00000001
241 #define PF_MBUF_TAGGED 0x00000002 /* pf_tag field is valid */
242 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */
243 #define PF_MBUF_TRANSLATE_LOCALHOST \
245 #define PF_MBUF_FRAGCACHE 0x00000010
246 #define ALTQ_MBUF_TAGGED 0x00000020 /* altq_qid is valid */
247 #define PF_MBUF_GENERATED FW_MBUF_GENERATED
248 #define IPFW_MBUF_GENERATED FW_MBUF_GENERATED
249 #define DUMMYNET_MBUF_TAGGED 0x00000080
250 #define ALTQ_MBUF_STATE_HASHED 0x00000100
255 #define MT_FREE 0 /* should be on free list */
256 #define MT_DATA 1 /* dynamic (data) allocation */
257 #define MT_HEADER 2 /* packet header */
258 #define MT_SONAME 3 /* socket name */
259 #define MT_TAG 4 /* volatile metadata associated to pkts */
260 #define MT_CONTROL 5 /* extra-data protocol message */
261 #define MT_OOBDATA 6 /* expedited data */
262 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */
265 struct mbuf
*mc_head
;
266 struct mbuf
*mc_tail
;
270 * General mbuf allocator statistics structure.
273 u_long m_mbufs
; /* mbufs obtained from page pool */
274 u_long m_clusters
; /* clusters obtained from page pool */
275 u_long m_spare
; /* spare field */
276 u_long m_clfree
; /* free clusters */
277 u_long m_drops
; /* times failed to find space */
278 u_long m_wait
; /* times waited for space */
279 u_long m_drain
; /* times drained protocols for space */
280 u_long m_mcfail
; /* times m_copym failed */
281 u_long m_mpfail
; /* times m_pullup failed */
282 u_long m_msize
; /* length of an mbuf */
283 u_long m_mclbytes
; /* length of an mbuf cluster */
284 u_long m_minclsize
; /* min length of data to allocate a cluster */
285 u_long m_mlen
; /* length of data in an mbuf */
286 u_long m_mhlen
; /* length of data in a header mbuf */
290 * Flags specifying how an allocation should be made.
293 #define MB_DONTWAIT 0x4
294 #define MB_TRYWAIT 0x8
295 #define MB_WAIT MB_TRYWAIT
298 * Mbuf to Malloc Flag Conversion.
300 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT)
303 * These are identifying numbers passed to the m_mballoc_wait function,
304 * allowing us to determine whether the call came from an MGETHDR or
311 * mbuf allocation/deallocation macros (YYY deprecated, too big):
313 * MGET(struct mbuf *m, int how, int type)
314 * allocates an mbuf and initializes it to contain internal data.
316 * MGETHDR(struct mbuf *m, int how, int type)
317 * allocates an mbuf and initializes it to contain a packet header
320 #define MGET(m, how, type) do { \
321 (m) = m_get((how), (type)); \
324 #define MGETHDR(m, how, type) do { \
325 (m) = m_gethdr((how), (type)); \
329 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon
331 * Deprecated. Use m_getcl() or m_getl() instead.
333 #define MCLGET(m, how) do { \
334 m_mclget((m), (how)); \
338 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
342 * Move mbuf pkthdr from "from" to "to".
343 * from should have M_PKTHDR set, and to must be empty.
344 * from no longer has a pkthdr after this operation.
346 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from))
349 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
350 * an object of the specified size at the end of the mbuf, longword aligned.
352 #define M_ALIGN(m, len) do { \
353 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
357 * As above, for mbufs allocated with m_gethdr/MGETHDR
358 * or initialized by M_COPY_PKTHDR.
360 #define MH_ALIGN(m, len) do { \
361 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
365 * Check if we can write to an mbuf.
367 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1)
368 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
371 * Check if the supplied mbuf has a packet header, or else panic.
373 #define M_ASSERTPKTHDR(m) \
374 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \
375 ("%s: invalid mbuf or no mbuf packet header!", __func__))
378 * Compute the amount of space available before the current start of data.
379 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
380 * of checking writability of the mbuf data area rests solely with the caller.
382 #define M_LEADINGSPACE(m) \
383 ((m)->m_flags & M_EXT ? \
384 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
385 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
386 (m)->m_data - (m)->m_dat)
389 * Compute the amount of space available after the end of data in an mbuf.
390 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
391 * of checking writability of the mbuf data area rests solely with the caller.
393 #define M_TRAILINGSPACE(m) \
394 ((m)->m_flags & M_EXT ? \
395 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
396 - ((m)->m_data + (m)->m_len) : 0) : \
397 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
400 * Arrange to prepend space of size plen to mbuf m.
401 * If a new mbuf must be allocated, how specifies whether to wait.
402 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain
403 * is freed and m is set to NULL.
405 #define M_PREPEND(m, plen, how) do { \
406 struct mbuf **_mmp = &(m); \
407 struct mbuf *_mm = *_mmp; \
408 int _mplen = (plen); \
409 int __mhow = (how); \
411 if (M_LEADINGSPACE(_mm) >= _mplen) { \
412 _mm->m_data -= _mplen; \
413 _mm->m_len += _mplen; \
415 _mm = m_prepend(_mm, _mplen, __mhow); \
416 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
417 _mm->m_pkthdr.len += _mplen; \
421 /* Length to m_copy to copy all. */
422 #define M_COPYALL 1000000000
424 /* Compatibility with 4.3 */
425 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT)
428 extern u_int m_clalloc_wid
; /* mbuf cluster wait count */
429 extern u_int m_mballoc_wid
; /* mbuf wait count */
430 extern int max_linkhdr
; /* largest link-level header */
431 extern int max_protohdr
; /* largest protocol header */
432 extern int max_hdr
; /* largest link+protocol header */
433 extern int max_datalen
; /* MHLEN - max_hdr */
434 extern int mbuf_wait
; /* mbuf sleep time */
435 extern int nmbclusters
;
440 void m_adj(struct mbuf
*, int);
441 void m_cat(struct mbuf
*, struct mbuf
*);
442 u_int
m_countm(struct mbuf
*m
, struct mbuf
**lastm
, u_int
*mbcnt
);
443 void m_copyback(struct mbuf
*, int, int, caddr_t
);
444 void m_copydata(const struct mbuf
*, int, int, caddr_t
);
445 struct mbuf
*m_copym(const struct mbuf
*, int, int, int);
446 struct mbuf
*m_copypacket(struct mbuf
*, int);
447 struct mbuf
*m_defrag(struct mbuf
*, int);
448 struct mbuf
*m_defrag_nofree(struct mbuf
*, int);
449 struct mbuf
*m_devget(char *, int, int, struct ifnet
*,
450 void (*copy
)(volatile const void *, volatile void *, size_t));
451 struct mbuf
*m_dup(struct mbuf
*, int);
452 int m_dup_pkthdr(struct mbuf
*, const struct mbuf
*, int);
453 struct mbuf
*m_free(struct mbuf
*);
454 void m_freem(struct mbuf
*);
455 struct mbuf
*m_get(int, int);
456 struct mbuf
*m_getc(int len
, int how
, int type
);
457 struct mbuf
*m_getcl(int how
, short type
, int flags
);
458 struct mbuf
*m_getclr(int, int);
459 struct mbuf
*m_gethdr(int, int);
460 struct mbuf
*m_getm(struct mbuf
*, int, int, int);
461 struct mbuf
*m_last(struct mbuf
*m
);
462 u_int
m_lengthm(struct mbuf
*m
, struct mbuf
**lastm
);
463 void m_move_pkthdr(struct mbuf
*, struct mbuf
*);
464 struct mbuf
*m_prepend(struct mbuf
*, int, int);
465 void m_print(const struct mbuf
*m
);
466 struct mbuf
*m_pulldown(struct mbuf
*, int, int, int *);
467 struct mbuf
*m_pullup(struct mbuf
*, int);
468 struct mbuf
*m_split(struct mbuf
*, int, int);
469 struct mbuf
*m_uiomove(struct uio
*);
470 void m_mclget(struct mbuf
*m
, int how
);
471 int m_sharecount(struct mbuf
*m
);
472 void m_chtype(struct mbuf
*m
, int type
);
475 void mbuftrackid(struct mbuf
*, int);
477 #define mbuftrackid(m, id) /* empty */
481 * Allocate the right type of mbuf for the desired total length.
482 * The mbuf returned does not necessarily cover the entire requested length.
483 * This function follows mbuf chaining policy of allowing MINCLSIZE
484 * amount of chained mbufs.
486 static __inline
struct mbuf
*
487 m_getl(int len
, int how
, int type
, int flags
, int *psize
)
492 if (len
>= MINCLSIZE
) {
493 m
= m_getcl(how
, type
, flags
);
495 } else if (flags
& M_PKTHDR
) {
496 m
= m_gethdr(how
, type
);
499 m
= m_get(how
, type
);
508 * Get a single mbuf that covers the requested number of bytes.
509 * This function does not create mbuf chains. It explicitly marks
510 * places in the code that abuse mbufs for contiguous data buffers.
512 static __inline
struct mbuf
*
513 m_getb(int len
, int how
, int type
, int flags
)
516 int mbufsize
= (flags
& M_PKTHDR
) ? MHLEN
: MLEN
;
519 m
= m_getcl(how
, type
, flags
);
520 else if (flags
& M_PKTHDR
)
521 m
= m_gethdr(how
, type
);
523 m
= m_get(how
, type
);
528 * Packets may have annotations attached by affixing a list
529 * of "packet tags" to the pkthdr structure. Packet tags are
530 * dynamically allocated semi-opaque data structures that have
531 * a fixed header (struct m_tag) that specifies the size of the
532 * memory block and a <cookie,type> pair that identifies it.
533 * The cookie is a 32-bit unique unsigned value used to identify
534 * a module or ABI. By convention this value is chose as the
535 * date+time that the module is created, expressed as the number of
536 * seconds since the epoch (e.g. using date -u +'%s'). The type value
537 * is an ABI/module-specific value that identifies a particular annotation
538 * and is private to the module. For compatibility with systems
539 * like openbsd that define packet tags w/o an ABI/module cookie,
540 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
541 * m_tag_find compatibility shim functions and several tag types are
542 * defined below. Users that do not require compatibility should use
543 * a private cookie value so that packet tag-related definitions
544 * can be maintained privately.
546 * Note that the packet tag returned by m_tag_alloc has the default
547 * memory alignment implemented by kmalloc. To reference private data
548 * one can use a construct like:
550 * struct m_tag *mtag = m_tag_alloc(...);
551 * struct foo *p = m_tag_data(mtag);
553 * if the alignment of struct m_tag is sufficient for referencing members
554 * of struct foo. Otherwise it is necessary to embed struct m_tag within
555 * the private data structure to insure proper alignment; e.g.
561 * struct foo *p = (struct foo *)m_tag_alloc(...);
562 * struct m_tag *mtag = &p->tag;
565 #define PACKET_TAG_NONE 0 /* Nadda */
567 /* Packet tag for use with PACKET_ABI_COMPAT */
568 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
569 /* struct tdb_indent */
570 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
571 /* struct tdb_indent */
572 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
573 /* struct tdb_indent, never added */
574 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
575 /* struct tdb_indent, never added */
576 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */
577 /* struct tdb_indent, never added */
578 #define PACKET_TAG_ENCAP 6 /* Encap. processing */
579 /* struct ifnet *, the GIF interface */
580 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */
581 /* struct ipsec_history */
582 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */
584 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
586 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
588 #define PACKET_TAG_CARP 28 /* CARP info */
591 * As a temporary and low impact solution to replace the even uglier
592 * approach used so far in some parts of the network stack (which relies
593 * on global variables), packet tag-like annotations are stored in MT_TAG
594 * mbufs (or lookalikes) prepended to the actual mbuf chain.
598 * m_next = next buffer in chain.
600 * BE VERY CAREFUL not to pass these blocks to the mbuf handling routines.
602 #define _m_tag_id m_hdr.mh_flags
604 /* Packet tags used in the FreeBSD network stack */
605 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
606 /* struct sockaddr_in * as m_data */
608 /* Packet tag routines */
609 struct m_tag
*m_tag_alloc(u_int32_t
, int, int, int);
610 void m_tag_free(struct m_tag
*);
611 void m_tag_prepend(struct mbuf
*, struct m_tag
*);
612 void m_tag_unlink(struct mbuf
*, struct m_tag
*);
613 void m_tag_delete(struct mbuf
*, struct m_tag
*);
614 void m_tag_delete_chain(struct mbuf
*);
615 struct m_tag
*m_tag_locate(struct mbuf
*, u_int32_t
, int, struct m_tag
*);
616 struct m_tag
*m_tag_copy(struct m_tag
*, int);
617 int m_tag_copy_chain(struct mbuf
*, const struct mbuf
*, int);
618 void m_tag_init(struct mbuf
*);
619 struct m_tag
*m_tag_first(struct mbuf
*);
620 struct m_tag
*m_tag_next(struct mbuf
*, struct m_tag
*);
622 /* these are for openbsd compatibility */
623 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
625 static __inline
void *
626 m_tag_data(struct m_tag
*tag
)
628 return ((void *)(tag
+ 1));
631 static __inline
struct m_tag
*
632 m_tag_get(int type
, int length
, int wait
)
634 return m_tag_alloc(MTAG_ABI_COMPAT
, type
, length
, wait
);
637 static __inline
struct m_tag
*
638 m_tag_find(struct mbuf
*m
, int type
, struct m_tag
*start
)
640 return m_tag_locate(m
, MTAG_ABI_COMPAT
, type
, start
);
645 #endif /* _KERNEL || _KERNEL_STRUCTURES */
646 #endif /* !_SYS_MBUF_H_ */