2 * Copyright (c) 2004 The DragonFly Project. All rights reserved.
4 * Copyright (c) 1982, 1986, 1988, 1993
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17 * This product includes software developed by the University of
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20 * may be used to endorse or promote products derived from this software
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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>
57 #ifndef _NET_ETHERNET_H_
58 #include <net/ethernet.h>
62 * Mbufs are of a single size, MSIZE (machine/param.h), which
63 * includes overhead. An mbuf may add a single "mbuf cluster" of size
64 * MCLBYTES (also in machine/param.h), which has no additional overhead
65 * and is used instead of the internal data area; this is done when
66 * at least MINCLSIZE of data must be stored.
68 #define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */
69 #define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */
70 #define MINCLSIZE (MHLEN + 1) /* smallest amount to put in cluster */
71 #define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */
74 * Macros for type conversion:
75 * mtod(m, t) -- Convert mbuf pointer to data pointer of correct type.
76 * mtodoff(m, t, off) -- Convert mbuf pointer at the specified offset to data
77 * pointer of correct type.
79 #define mtod(m, t) ((t)((m)->m_data))
80 #define mtodoff(m, t, off) ((t)((m)->m_data + (off)))
83 * Header present at the beginning of every mbuf.
86 struct mbuf *mh_next; /* next buffer in chain */
87 struct mbuf *mh_nextpkt; /* next chain in queue/record */
88 caddr_t mh_data; /* location of data */
89 int mh_len; /* amount of data in this mbuf */
90 int mh_flags; /* flags; see below */
91 short mh_type; /* type of data in this mbuf */
92 short mh_pad; /* padding */
94 const char *mh_lastfunc;
96 struct netmsg_packet mh_netmsg; /* hardware->proto stack msg */
101 void *hdr; /* saved hdr pos in mbuf, for ECN */
102 void *statekey; /* pf stackside statekey */
103 u_int rtableid; /* alternate routing table id */
104 u_int32_t qid; /* queue id */
105 u_int16_t tag; /* tag id */
108 uint32_t state_hash; /* identifies 'connections' */
109 uint8_t ecn_af; /* for altq_red */
115 /* pkthdr_pf.flags */
116 #define PF_TAG_GENERATED 0x01
117 #define PF_TAG_FRAGCACHE 0x02
118 #define PF_TAG_TRANSLATE_LOCALHOST 0x04
119 #define PF_TAG_DIVERTED 0x08
120 #define PF_TAG_DIVERTED_PACKET 0x10
121 #define PF_TAG_REROUTE 0x20
124 * Valid if BRIDGE_MBUF_TAGGED is set in fw_flags, records
125 * the original ether header (if compatible). The bridge
128 struct ether_header ether;
132 * Packet tag structure (see below for details).
135 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
136 u_int16_t m_tag_id; /* Tag ID */
137 u_int16_t m_tag_len; /* Length of data */
138 u_int32_t m_tag_cookie; /* ABI/Module ID */
141 SLIST_HEAD(packet_tags, m_tag);
144 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
146 * Be careful: The fields have been carefully ordered to avoid hidden padding.
147 * Keep this in mind, when adding or removing fields!
150 struct ifnet *rcvif; /* rcv interface */
151 int len; /* total packet length */
152 struct packet_tags tags; /* list of packet tags */
154 /* variables for ip and tcp reassembly */
155 void *header; /* pointer to packet header */
157 /* variables for hardware checksum */
158 int csum_flags; /* flags regarding checksum */
159 int csum_data; /* data field used by csum routines */
162 uint32_t fw_flags; /* flags for PF */
164 /* variables for PF processing */
165 struct pkthdr_pf pf; /* structure for PF */
166 struct pkthdr_br br; /* structure for bridging */
168 uint16_t ether_vlantag; /* ethernet 802.1p+q vlan tag */
169 uint16_t hash; /* packet hash */
171 uint16_t wlan_seqno; /* IEEE 802.11 seq no. */
175 * Description of external storage mapped into mbuf; valid only if M_EXT is set.
178 caddr_t ext_buf; /* start of buffer */
179 void (*ext_free)(void *);
180 u_int ext_size; /* size of buffer, for ext_free */
181 void (*ext_ref)(void *);
186 * The core of the mbuf object along with some shortcut defines for
187 * practical purposes.
193 struct pkthdr MH_pkthdr; /* M_PKTHDR set */
195 struct m_ext MH_ext; /* M_EXT set */
196 char MH_databuf[MHLEN];
199 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
202 #define m_next m_hdr.mh_next
203 #define m_len m_hdr.mh_len
204 #define m_data m_hdr.mh_data
205 #define m_type m_hdr.mh_type
206 #define m_flags m_hdr.mh_flags
207 #define m_nextpkt m_hdr.mh_nextpkt
208 #define m_pkthdr M_dat.MH.MH_pkthdr
209 #define m_ext M_dat.MH.MH_dat.MH_ext
210 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
211 #define m_dat M_dat.M_databuf
214 * Code that uses m_act should be converted to use m_nextpkt
215 * instead; m_act is historical and deprecated.
217 #define m_act m_nextpkt
222 #define M_EXT 0x0001 /* has associated external storage */
223 #define M_PKTHDR 0x0002 /* start of record */
224 #define M_EOR 0x0004 /* end of record */
225 #define M_PROTO1 0x0008 /* protocol-specific */
226 #define M_PROTO2 0x0010 /* protocol-specific */
227 #define M_PROTO3 0x0020 /* protocol-specific */
228 #define M_PROTO4 0x0040 /* protocol-specific */
229 #define M_PROTO5 0x0080 /* protocol-specific */
232 * mbuf pkthdr flags (also stored in m_flags).
234 #define M_BCAST 0x0100 /* send/received as link-level broadcast */
235 #define M_MCAST 0x0200 /* send/received as link-level multicast */
236 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */
237 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */
238 #define M_LASTFRAG 0x1000 /* packet is last fragment */
239 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */
240 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */
241 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */
242 #define M_NOTIFICATION 0x10000 /* notification event */
243 #define M_VLANTAG 0x20000 /* ether_vlantag is valid */
244 #define M_MPLSLABELED 0x40000 /* packet is mpls labeled */
245 #define M_LENCHECKED 0x80000 /* packet proto lengths are checked */
246 #define M_HASH 0x100000/* hash field in pkthdr is valid */
247 #define M_PROTO6 0x200000/* protocol-specific */
248 #define M_PROTO7 0x400000/* protocol-specific */
249 #define M_PROTO8 0x800000/* protocol-specific */
252 * Flags copied when copying m_pkthdr.
254 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO2|M_PROTO3 | \
255 M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8 | \
256 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \
257 M_VLANTAG|M_MPLSLABELED | \
261 * Flags indicating hw checksum support and sw checksum requirements.
263 #define CSUM_IP 0x0001 /* will csum IP */
264 #define CSUM_TCP 0x0002 /* will csum TCP */
265 #define CSUM_UDP 0x0004 /* will csum UDP */
266 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
267 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
269 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
270 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
271 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
272 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
273 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment
274 * NB: This flag is only used
275 * by IP defragmenter.
278 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
279 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
282 * Flags indicating PF processing status
284 #define FW_MBUF_GENERATED 0x00000001
285 #define PF_MBUF_STRUCTURE 0x00000002 /* m_pkthdr.pf valid */
286 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */
287 #define PF_MBUF_TAGGED 0x00000008
288 #define XX_MBUF_UNUSED10 0x00000010
289 #define XX_MBUF_UNUSED20 0x00000020
290 #define IPFORWARD_MBUF_TAGGED 0x00000040
291 #define DUMMYNET_MBUF_TAGGED 0x00000080
292 #define BRIDGE_MBUF_TAGGED 0x00000100
293 #define FW_MBUF_REDISPATCH 0x00000200
294 #define IPFW_MBUF_GENERATED FW_MBUF_GENERATED
298 #define MT_FREE 0 /* should be on free list */
299 #define MT_DATA 1 /* dynamic (data) allocation */
300 #define MT_HEADER 2 /* packet header */
301 #define MT_SONAME 3 /* socket name */
303 #define MT_CONTROL 5 /* extra-data protocol message */
304 #define MT_OOBDATA 6 /* expedited data */
305 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */
308 struct mbuf *mc_head;
309 struct mbuf *mc_tail;
313 * General mbuf allocator statistics structure.
316 u_long m_mbufs; /* mbufs obtained from page pool */
317 u_long m_clusters; /* clusters obtained from page pool */
318 u_long m_spare; /* spare field */
319 u_long m_clfree; /* free clusters */
320 u_long m_drops; /* times failed to find space */
321 u_long m_wait; /* times waited for space */
322 u_long m_drain; /* times drained protocols for space */
323 u_long m_mcfail; /* times m_copym failed */
324 u_long m_mpfail; /* times m_pullup failed */
325 u_long m_msize; /* length of an mbuf */
326 u_long m_mclbytes; /* length of an mbuf cluster */
327 u_long m_mjumpagesize; /* length of a jumbo mbuf cluster */
328 u_long m_minclsize; /* min length of data to allocate a cluster */
329 u_long m_mlen; /* length of data in an mbuf */
330 u_long m_mhlen; /* length of data in a header mbuf */
334 * Flags specifying how an allocation should be made.
337 #define MB_DONTWAIT 0x4
338 #define MB_TRYWAIT 0x8
339 #define MB_WAIT MB_TRYWAIT
342 * Mbuf to Malloc Flag Conversion.
344 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT)
347 * These are identifying numbers passed to the m_mballoc_wait function,
348 * allowing us to determine whether the call came from an MGETHDR or
355 * mbuf allocation/deallocation macros (YYY deprecated, too big):
357 * MGET(struct mbuf *m, int how, int type)
358 * allocates an mbuf and initializes it to contain internal data.
360 * MGETHDR(struct mbuf *m, int how, int type)
361 * allocates an mbuf and initializes it to contain a packet header
364 #define MGET(m, how, type) do { \
365 (m) = m_get((how), (type)); \
368 #define MGETHDR(m, how, type) do { \
369 (m) = m_gethdr((how), (type)); \
373 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon
375 * Deprecated. Use m_getcl() or m_getl() instead.
377 #define MCLGET(m, how) do { \
378 m_mclget((m), (how)); \
382 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
386 * Move mbuf pkthdr from "from" to "to".
387 * from should have M_PKTHDR set, and to must be empty.
388 * from no longer has a pkthdr after this operation.
390 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from))
393 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
394 * an object of the specified size at the end of the mbuf, longword aligned.
396 #define M_ALIGN(m, len) do { \
397 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
401 * As above, for mbufs allocated with m_gethdr/MGETHDR
402 * or initialized by M_COPY_PKTHDR.
404 #define MH_ALIGN(m, len) do { \
405 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
409 * Check if we can write to an mbuf.
411 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1)
412 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
415 * Check if the supplied mbuf has a packet header, or else panic.
417 #define M_ASSERTPKTHDR(m) \
418 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \
419 ("%s: invalid mbuf or no mbuf packet header!", __func__))
422 * Compute the amount of space available before the current start of data.
423 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
424 * of checking writability of the mbuf data area rests solely with the caller.
426 #define M_LEADINGSPACE(m) \
427 ((m)->m_flags & M_EXT ? \
428 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
429 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
430 (m)->m_data - (m)->m_dat)
433 * Compute the amount of space available after the end of data in an mbuf.
434 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
435 * of checking writability of the mbuf data area rests solely with the caller.
437 #define M_TRAILINGSPACE(m) \
438 ((m)->m_flags & M_EXT ? \
439 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
440 - ((m)->m_data + (m)->m_len) : 0) : \
441 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
444 * Arrange to prepend space of size plen to mbuf m.
445 * If a new mbuf must be allocated, how specifies whether to wait.
446 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain
447 * is freed and m is set to NULL.
449 #define M_PREPEND(m, plen, how) do { \
450 struct mbuf **_mmp = &(m); \
451 struct mbuf *_mm = *_mmp; \
452 int _mplen = (plen); \
453 int __mhow = (how); \
455 if (M_LEADINGSPACE(_mm) >= _mplen) { \
456 _mm->m_data -= _mplen; \
457 _mm->m_len += _mplen; \
459 _mm = m_prepend(_mm, _mplen, __mhow); \
460 if (_mm != NULL && (_mm->m_flags & M_PKTHDR)) \
461 _mm->m_pkthdr.len += _mplen; \
465 /* Length to m_copy to copy all. */
466 #define M_COPYALL 1000000000
468 /* Compatibility with 4.3 */
469 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT)
472 extern u_int m_clalloc_wid; /* mbuf cluster wait count */
473 extern u_int m_mballoc_wid; /* mbuf wait count */
474 extern int max_linkhdr; /* largest link-level header */
475 extern int max_protohdr; /* largest protocol header */
476 extern int max_hdr; /* largest link+protocol header */
477 extern int max_datalen; /* MHLEN - max_hdr */
478 extern int mbuf_wait; /* mbuf sleep time */
479 extern int nmbclusters;
484 void m_adj(struct mbuf *, int);
485 void m_align(struct mbuf *, int);
486 int m_apply(struct mbuf *, int, int,
487 int (*)(void *, void *, u_int), void *);
488 int m_append(struct mbuf *, int, c_caddr_t);
489 void m_cat(struct mbuf *, struct mbuf *);
490 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
491 void m_copyback(struct mbuf *, int, int, caddr_t);
492 void m_copydata(const struct mbuf *, int, int, caddr_t);
493 struct mbuf *m_copym(const struct mbuf *, int, int, int);
494 struct mbuf *m_copypacket(struct mbuf *, int);
495 struct mbuf *m_defrag(struct mbuf *, int);
496 struct mbuf *m_defrag_nofree(struct mbuf *, int);
497 struct mbuf *m_devget(char *, int, int, struct ifnet *,
498 void (*copy)(volatile const void *, volatile void *, size_t));
499 struct mbuf *m_dup(struct mbuf *, int);
500 struct mbuf *m_dup_data(struct mbuf *, int);
501 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
503 struct mbuf *_m_free(struct mbuf *, const char *name);
504 void _m_freem(struct mbuf *, const char *name);
506 struct mbuf *m_free(struct mbuf *);
507 void m_freem(struct mbuf *);
509 struct mbuf *m_get(int, int);
510 struct mbuf *m_getc(int len, int how, int type);
511 struct mbuf *m_getcl(int how, short type, int flags);
512 struct mbuf *m_getjcl(int how, short type, int flags, size_t size);
513 struct mbuf *m_getclr(int, int);
514 struct mbuf *m_gethdr(int, int);
515 struct mbuf *m_getm(struct mbuf *, int, int, int);
516 struct mbuf *m_getptr(struct mbuf *, int, int *);
517 struct mbuf *m_last(struct mbuf *m);
518 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm);
519 void m_move_pkthdr(struct mbuf *, struct mbuf *);
520 struct mbuf *m_prepend(struct mbuf *, int, int);
521 void m_print(const struct mbuf *m);
522 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
523 struct mbuf *m_pullup(struct mbuf *, int);
524 struct mbuf *m_split(struct mbuf *, int, int);
525 struct mbuf *m_uiomove(struct uio *);
526 void m_mclget(struct mbuf *m, int how);
527 int m_sharecount(struct mbuf *m);
528 void m_chtype(struct mbuf *m, int type);
529 int m_devpad(struct mbuf *m, int padto);
533 void mbuftrackid(struct mbuf *, int);
535 #define m_free(m) _m_free(m, __func__)
536 #define m_freem(m) _m_freem(m, __func__)
540 #define mbuftrackid(m, id) /* empty */
545 * Allocate the right type of mbuf for the desired total length.
546 * The mbuf returned does not necessarily cover the entire requested length.
547 * This function follows mbuf chaining policy of allowing MINCLSIZE
548 * amount of chained mbufs.
550 static __inline struct mbuf *
551 m_getl(int len, int how, int type, int flags, int *psize)
556 if (len >= MINCLSIZE) {
557 m = m_getcl(how, type, flags);
559 } else if (flags & M_PKTHDR) {
560 m = m_gethdr(how, type);
563 m = m_get(how, type);
572 * Get a single mbuf that covers the requested number of bytes.
573 * This function does not create mbuf chains. It explicitly marks
574 * places in the code that abuse mbufs for contiguous data buffers.
576 static __inline struct mbuf *
577 m_getb(int len, int how, int type, int flags)
580 int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
583 m = m_getcl(how, type, flags);
584 else if (flags & M_PKTHDR)
585 m = m_gethdr(how, type);
587 m = m_get(how, type);
592 * Packets may have annotations attached by affixing a list
593 * of "packet tags" to the pkthdr structure. Packet tags are
594 * dynamically allocated semi-opaque data structures that have
595 * a fixed header (struct m_tag) that specifies the size of the
596 * memory block and a <cookie,type> pair that identifies it.
597 * The cookie is a 32-bit unique unsigned value used to identify
598 * a module or ABI. By convention this value is chose as the
599 * date+time that the module is created, expressed as the number of
600 * seconds since the epoch (e.g. using date -u +'%s'). The type value
601 * is an ABI/module-specific value that identifies a particular annotation
602 * and is private to the module. For compatibility with systems
603 * like openbsd that define packet tags w/o an ABI/module cookie,
604 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
605 * m_tag_find compatibility shim functions and several tag types are
606 * defined below. Users that do not require compatibility should use
607 * a private cookie value so that packet tag-related definitions
608 * can be maintained privately.
610 * Note that the packet tag returned by m_tag_alloc has the default
611 * memory alignment implemented by kmalloc. To reference private data
612 * one can use a construct like:
614 * struct m_tag *mtag = m_tag_alloc(...);
615 * struct foo *p = m_tag_data(mtag);
617 * if the alignment of struct m_tag is sufficient for referencing members
618 * of struct foo. Otherwise it is necessary to embed struct m_tag within
619 * the private data structure to insure proper alignment; e.g.
625 * struct foo *p = (struct foo *)m_tag_alloc(...);
626 * struct m_tag *mtag = &p->tag;
629 #define PACKET_TAG_NONE 0 /* Nadda */
631 /* Packet tag for use with PACKET_ABI_COMPAT */
632 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
633 /* struct tdb_indent */
634 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
635 /* struct tdb_indent */
636 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
637 /* struct tdb_indent, never added */
638 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
639 /* struct tdb_indent, never added */
640 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */
641 /* struct tdb_indent, never added */
642 #define PACKET_TAG_ENCAP 6 /* Encap. processing */
643 /* struct ifnet *, the GIF interface */
644 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */
645 /* struct ipsec_history */
646 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */
648 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
649 /* struct divert_info */
650 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
652 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
653 /* struct sockaddr_in */
654 #define PACKET_TAG_IPSRCRT 27 /* IP srcrt opts */
655 /* struct ip_srcrt_opt */
656 #define PACKET_TAG_CARP 28 /* CARP info */
658 #define PACKET_TAG_PF 29 /* PF info */
660 #define PACKET_TAG_PF_DIVERT 0x0200 /* pf(4) diverted packet */
663 /* Packet tag routines */
664 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
665 void m_tag_free(struct m_tag *);
666 void m_tag_prepend(struct mbuf *, struct m_tag *);
667 void m_tag_unlink(struct mbuf *, struct m_tag *);
668 void m_tag_delete(struct mbuf *, struct m_tag *);
669 void m_tag_delete_chain(struct mbuf *);
670 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
671 struct m_tag *m_tag_copy(struct m_tag *, int);
672 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
673 void m_tag_init(struct mbuf *);
674 struct m_tag *m_tag_first(struct mbuf *);
675 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *);
677 /* these are for openbsd compatibility */
678 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
680 static __inline void *
681 m_tag_data(struct m_tag *tag)
683 return ((void *)(tag + 1));
686 static __inline struct m_tag *
687 m_tag_get(int type, int length, int wait)
689 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
692 static __inline struct m_tag *
693 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
695 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
700 #endif /* _KERNEL || _KERNEL_STRUCTURES */
701 #endif /* !_SYS_MBUF_H_ */