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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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;
97 struct netmsg_packet mhm_pkt; /* hardware->proto stack msg */
98 struct netmsg_pru_send mhm_snd; /* usrspace->proto stack msg */
101 #define mh_netmsg mh_msgu.mhm_pkt
102 #define mh_sndmsg mh_msgu.mhm_snd
106 void *hdr; /* saved hdr pos in mbuf, for ECN */
107 void *statekey; /* pf stackside statekey */
108 u_int rtableid; /* alternate routing table id */
109 u_int32_t qid; /* queue id */
110 u_int16_t tag; /* tag id */
113 uint32_t state_hash; /* identifies 'connections' */
114 uint8_t ecn_af; /* for altq_red */
120 /* pkthdr_pf.flags */
121 #define PF_TAG_GENERATED 0x01
122 #define PF_TAG_FRAGCACHE 0x02
123 #define PF_TAG_TRANSLATE_LOCALHOST 0x04
124 #define PF_TAG_DIVERTED 0x08
125 #define PF_TAG_DIVERTED_PACKET 0x10
126 #define PF_TAG_REROUTE 0x20
129 * Valid if BRIDGE_MBUF_TAGGED is set in fw_flags, records
130 * the original ether header (if compatible). The bridge
133 struct ether_header ether;
137 * Packet tag structure (see below for details).
140 SLIST_ENTRY(m_tag) m_tag_link; /* List of packet tags */
141 u_int16_t m_tag_id; /* Tag ID */
142 u_int16_t m_tag_len; /* Length of data */
143 u_int32_t m_tag_cookie; /* ABI/Module ID */
146 SLIST_HEAD(packet_tags, m_tag);
149 * Record/packet header in first mbuf of chain; valid only if M_PKTHDR is set.
151 * Be careful: The fields have been carefully ordered to avoid hidden padding.
152 * Keep this in mind, when adding or removing fields!
155 struct ifnet *rcvif; /* rcv interface */
156 int len; /* total packet length */
157 struct packet_tags tags; /* list of packet tags */
159 /* variables for ip and tcp reassembly */
160 void *header; /* pointer to packet header */
162 /* variables for hardware checksum */
163 int csum_flags; /* flags regarding checksum */
164 int csum_data; /* data field used by csum routines */
167 uint32_t fw_flags; /* flags for PF */
169 /* variables for PF processing */
170 struct pkthdr_pf pf; /* structure for PF */
171 struct pkthdr_br br; /* structure for bridging */
173 uint16_t ether_vlantag; /* ethernet 802.1p+q vlan tag */
174 uint16_t hash; /* packet hash */
176 uint16_t wlan_seqno; /* IEEE 802.11 seq no. */
180 * Description of external storage mapped into mbuf; valid only if M_EXT is set.
183 caddr_t ext_buf; /* start of buffer */
184 void (*ext_free)(void *);
185 u_int ext_size; /* size of buffer, for ext_free */
186 void (*ext_ref)(void *);
191 * The core of the mbuf object along with some shortcut defines for
192 * practical purposes.
198 struct pkthdr MH_pkthdr; /* M_PKTHDR set */
200 struct m_ext MH_ext; /* M_EXT set */
201 char MH_databuf[MHLEN];
204 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
207 #define m_next m_hdr.mh_next
208 #define m_len m_hdr.mh_len
209 #define m_data m_hdr.mh_data
210 #define m_type m_hdr.mh_type
211 #define m_flags m_hdr.mh_flags
212 #define m_nextpkt m_hdr.mh_nextpkt
213 #define m_pkthdr M_dat.MH.MH_pkthdr
214 #define m_ext M_dat.MH.MH_dat.MH_ext
215 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
216 #define m_dat M_dat.M_databuf
219 * Code that uses m_act should be converted to use m_nextpkt
220 * instead; m_act is historical and deprecated.
222 #define m_act m_nextpkt
227 #define M_EXT 0x0001 /* has associated external storage */
228 #define M_PKTHDR 0x0002 /* start of record */
229 #define M_EOR 0x0004 /* end of record */
230 #define M_PROTO1 0x0008 /* protocol-specific */
231 #define M_PROTO2 0x0010 /* protocol-specific */
232 #define M_PROTO3 0x0020 /* protocol-specific */
233 #define M_PROTO4 0x0040 /* protocol-specific */
234 #define M_PROTO5 0x0080 /* protocol-specific */
237 * mbuf pkthdr flags (also stored in m_flags).
239 #define M_BCAST 0x0100 /* send/received as link-level broadcast */
240 #define M_MCAST 0x0200 /* send/received as link-level multicast */
241 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */
242 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */
243 #define M_LASTFRAG 0x1000 /* packet is last fragment */
244 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */
245 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */
246 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */
247 #define M_NOTIFICATION 0x10000 /* notification event */
248 #define M_VLANTAG 0x20000 /* ether_vlantag is valid */
249 #define M_MPLSLABELED 0x40000 /* packet is mpls labeled */
250 #define M_LENCHECKED 0x80000 /* packet proto lengths are checked */
251 #define M_HASH 0x100000/* hash field in pkthdr is valid */
252 #define M_PROTO6 0x200000/* protocol-specific */
253 #define M_PROTO7 0x400000/* protocol-specific */
254 #define M_PROTO8 0x800000/* protocol-specific */
257 * Flags copied when copying m_pkthdr.
259 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO2|M_PROTO3 | \
260 M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8 | \
261 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \
262 M_VLANTAG|M_MPLSLABELED | \
266 * Flags indicating hw checksum support and sw checksum requirements.
268 #define CSUM_IP 0x0001 /* will csum IP */
269 #define CSUM_TCP 0x0002 /* will csum TCP */
270 #define CSUM_UDP 0x0004 /* will csum UDP */
271 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
272 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
274 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
275 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
276 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
277 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
278 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment
279 * NB: This flag is only used
280 * by IP defragmenter.
283 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
284 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
287 * Flags indicating PF processing status
289 #define FW_MBUF_GENERATED 0x00000001
290 #define PF_MBUF_STRUCTURE 0x00000002 /* m_pkthdr.pf valid */
291 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */
292 #define PF_MBUF_TAGGED 0x00000008
293 #define XX_MBUF_UNUSED10 0x00000010
294 #define XX_MBUF_UNUSED20 0x00000020
295 #define IPFORWARD_MBUF_TAGGED 0x00000040
296 #define DUMMYNET_MBUF_TAGGED 0x00000080
297 #define BRIDGE_MBUF_TAGGED 0x00000100
298 #define FW_MBUF_REDISPATCH 0x00000200
299 #define IPFW_MBUF_GENERATED FW_MBUF_GENERATED
303 #define MT_FREE 0 /* should be on free list */
304 #define MT_DATA 1 /* dynamic (data) allocation */
305 #define MT_HEADER 2 /* packet header */
306 #define MT_SONAME 3 /* socket name */
308 #define MT_CONTROL 5 /* extra-data protocol message */
309 #define MT_OOBDATA 6 /* expedited data */
310 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */
313 struct mbuf *mc_head;
314 struct mbuf *mc_tail;
318 * General mbuf allocator statistics structure.
321 u_long m_mbufs; /* mbufs obtained from page pool */
322 u_long m_clusters; /* clusters obtained from page pool */
323 u_long m_spare; /* spare field */
324 u_long m_clfree; /* free clusters */
325 u_long m_drops; /* times failed to find space */
326 u_long m_wait; /* times waited for space */
327 u_long m_drain; /* times drained protocols for space */
328 u_long m_mcfail; /* times m_copym failed */
329 u_long m_mpfail; /* times m_pullup failed */
330 u_long m_msize; /* length of an mbuf */
331 u_long m_mclbytes; /* length of an mbuf cluster */
332 u_long m_mjumpagesize; /* length of a jumbo mbuf cluster */
333 u_long m_minclsize; /* min length of data to allocate a cluster */
334 u_long m_mlen; /* length of data in an mbuf */
335 u_long m_mhlen; /* length of data in a header mbuf */
339 * Flags specifying how an allocation should be made.
342 #define MB_DONTWAIT 0x4
343 #define MB_TRYWAIT 0x8
344 #define MB_WAIT MB_TRYWAIT
347 * Mbuf to Malloc Flag Conversion.
349 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT)
352 * These are identifying numbers passed to the m_mballoc_wait function,
353 * allowing us to determine whether the call came from an MGETHDR or
360 * mbuf allocation/deallocation macros (YYY deprecated, too big):
362 * MGET(struct mbuf *m, int how, int type)
363 * allocates an mbuf and initializes it to contain internal data.
365 * MGETHDR(struct mbuf *m, int how, int type)
366 * allocates an mbuf and initializes it to contain a packet header
369 #define MGET(m, how, type) do { \
370 (m) = m_get((how), (type)); \
373 #define MGETHDR(m, how, type) do { \
374 (m) = m_gethdr((how), (type)); \
378 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon
380 * Deprecated. Use m_getcl() or m_getl() instead.
382 #define MCLGET(m, how) do { \
383 m_mclget((m), (how)); \
387 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
391 * Move mbuf pkthdr from "from" to "to".
392 * from should have M_PKTHDR set, and to must be empty.
393 * from no longer has a pkthdr after this operation.
395 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from))
398 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
399 * an object of the specified size at the end of the mbuf, longword aligned.
401 #define M_ALIGN(m, len) do { \
402 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
406 * As above, for mbufs allocated with m_gethdr/MGETHDR
407 * or initialized by M_COPY_PKTHDR.
409 #define MH_ALIGN(m, len) do { \
410 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
414 * Check if we can write to an mbuf.
416 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1)
417 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
420 * Check if the supplied mbuf has a packet header, or else panic.
422 #define M_ASSERTPKTHDR(m) \
423 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \
424 ("%s: invalid mbuf or no mbuf packet header!", __func__))
427 * Compute the amount of space available before the current start of data.
428 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
429 * of checking writability of the mbuf data area rests solely with the caller.
431 #define M_LEADINGSPACE(m) \
432 ((m)->m_flags & M_EXT ? \
433 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
434 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
435 (m)->m_data - (m)->m_dat)
438 * Compute the amount of space available after the end of data in an mbuf.
439 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
440 * of checking writability of the mbuf data area rests solely with the caller.
442 #define M_TRAILINGSPACE(m) \
443 ((m)->m_flags & M_EXT ? \
444 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
445 - ((m)->m_data + (m)->m_len) : 0) : \
446 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
449 * Arrange to prepend space of size plen to mbuf m.
450 * If a new mbuf must be allocated, how specifies whether to wait.
451 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain
452 * is freed and m is set to NULL.
454 #define M_PREPEND(m, plen, how) do { \
455 struct mbuf **_mmp = &(m); \
456 struct mbuf *_mm = *_mmp; \
457 int _mplen = (plen); \
458 int __mhow = (how); \
460 if (M_LEADINGSPACE(_mm) >= _mplen) { \
461 _mm->m_data -= _mplen; \
462 _mm->m_len += _mplen; \
464 _mm = m_prepend(_mm, _mplen, __mhow); \
465 if (_mm != NULL && (_mm->m_flags & M_PKTHDR)) \
466 _mm->m_pkthdr.len += _mplen; \
470 /* Length to m_copy to copy all. */
471 #define M_COPYALL 1000000000
473 /* Compatibility with 4.3 */
474 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT)
477 extern u_int m_clalloc_wid; /* mbuf cluster wait count */
478 extern u_int m_mballoc_wid; /* mbuf wait count */
479 extern int max_linkhdr; /* largest link-level header */
480 extern int max_protohdr; /* largest protocol header */
481 extern int max_hdr; /* largest link+protocol header */
482 extern int max_datalen; /* MHLEN - max_hdr */
483 extern int mbuf_wait; /* mbuf sleep time */
484 extern int nmbclusters;
489 void m_adj(struct mbuf *, int);
490 void m_align(struct mbuf *, int);
491 int m_apply(struct mbuf *, int, int,
492 int (*)(void *, void *, u_int), void *);
493 int m_append(struct mbuf *, int, c_caddr_t);
494 void m_cat(struct mbuf *, struct mbuf *);
495 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
496 void m_copyback(struct mbuf *, int, int, caddr_t);
497 void m_copydata(const struct mbuf *, int, int, caddr_t);
498 struct mbuf *m_copym(const struct mbuf *, int, int, int);
499 struct mbuf *m_copypacket(struct mbuf *, int);
500 struct mbuf *m_defrag(struct mbuf *, int);
501 struct mbuf *m_defrag_nofree(struct mbuf *, int);
502 struct mbuf *m_devget(char *, int, int, struct ifnet *,
503 void (*copy)(volatile const void *, volatile void *, size_t));
504 struct mbuf *m_dup(struct mbuf *, int);
505 struct mbuf *m_dup_data(struct mbuf *, int);
506 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
507 void m_extadd(struct mbuf *, caddr_t, u_int, void (*)(void *),
508 void (*)(void *), void *);
510 struct mbuf *_m_free(struct mbuf *, const char *name);
511 void _m_freem(struct mbuf *, const char *name);
513 struct mbuf *m_free(struct mbuf *);
514 void m_freem(struct mbuf *);
516 struct mbuf *m_get(int, int);
517 struct mbuf *m_getc(int len, int how, int type);
518 struct mbuf *m_getcl(int how, short type, int flags);
519 struct mbuf *m_getjcl(int how, short type, int flags, size_t size);
520 struct mbuf *m_getclr(int, int);
521 struct mbuf *m_gethdr(int, int);
522 struct mbuf *m_getm(struct mbuf *, int, int, int);
523 struct mbuf *m_getptr(struct mbuf *, int, int *);
524 struct mbuf *m_last(struct mbuf *m);
525 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm);
526 void m_move_pkthdr(struct mbuf *, struct mbuf *);
527 struct mbuf *m_prepend(struct mbuf *, int, int);
528 void m_print(const struct mbuf *m);
529 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
530 struct mbuf *m_pullup(struct mbuf *, int);
531 struct mbuf *m_split(struct mbuf *, int, int);
532 struct mbuf *m_uiomove(struct uio *);
533 struct mbuf *m_unshare(struct mbuf *, int);
534 void m_mclget(struct mbuf *m, int how);
535 int m_sharecount(struct mbuf *m);
536 void m_chtype(struct mbuf *m, int type);
537 int m_devpad(struct mbuf *m, int padto);
541 void mbuftrackid(struct mbuf *, int);
543 #define m_free(m) _m_free(m, __func__)
544 #define m_freem(m) _m_freem(m, __func__)
548 #define mbuftrackid(m, id) /* empty */
553 * Allocate the right type of mbuf for the desired total length.
554 * The mbuf returned does not necessarily cover the entire requested length.
555 * This function follows mbuf chaining policy of allowing MINCLSIZE
556 * amount of chained mbufs.
558 static __inline struct mbuf *
559 m_getl(int len, int how, int type, int flags, int *psize)
564 if (len >= MINCLSIZE) {
565 m = m_getcl(how, type, flags);
567 } else if (flags & M_PKTHDR) {
568 m = m_gethdr(how, type);
571 m = m_get(how, type);
580 * Get a single mbuf that covers the requested number of bytes.
581 * This function does not create mbuf chains. It explicitly marks
582 * places in the code that abuse mbufs for contiguous data buffers.
584 static __inline struct mbuf *
585 m_getb(int len, int how, int type, int flags)
588 int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
591 m = m_getcl(how, type, flags);
592 else if (flags & M_PKTHDR)
593 m = m_gethdr(how, type);
595 m = m_get(how, type);
600 * Packets may have annotations attached by affixing a list
601 * of "packet tags" to the pkthdr structure. Packet tags are
602 * dynamically allocated semi-opaque data structures that have
603 * a fixed header (struct m_tag) that specifies the size of the
604 * memory block and a <cookie,type> pair that identifies it.
605 * The cookie is a 32-bit unique unsigned value used to identify
606 * a module or ABI. By convention this value is chose as the
607 * date+time that the module is created, expressed as the number of
608 * seconds since the epoch (e.g. using date -u +'%s'). The type value
609 * is an ABI/module-specific value that identifies a particular annotation
610 * and is private to the module. For compatibility with systems
611 * like openbsd that define packet tags w/o an ABI/module cookie,
612 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
613 * m_tag_find compatibility shim functions and several tag types are
614 * defined below. Users that do not require compatibility should use
615 * a private cookie value so that packet tag-related definitions
616 * can be maintained privately.
618 * Note that the packet tag returned by m_tag_alloc has the default
619 * memory alignment implemented by kmalloc. To reference private data
620 * one can use a construct like:
622 * struct m_tag *mtag = m_tag_alloc(...);
623 * struct foo *p = m_tag_data(mtag);
625 * if the alignment of struct m_tag is sufficient for referencing members
626 * of struct foo. Otherwise it is necessary to embed struct m_tag within
627 * the private data structure to insure proper alignment; e.g.
633 * struct foo *p = (struct foo *)m_tag_alloc(...);
634 * struct m_tag *mtag = &p->tag;
637 #define PACKET_TAG_NONE 0 /* Nadda */
639 /* Packet tag for use with PACKET_ABI_COMPAT */
640 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
641 /* struct tdb_indent */
642 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
643 /* struct tdb_indent */
644 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
645 /* struct tdb_indent, never added */
646 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
647 /* struct tdb_indent, never added */
648 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */
649 /* struct tdb_indent, never added */
650 #define PACKET_TAG_ENCAP 6 /* Encap. processing */
651 /* struct ifnet *, the GIF interface */
652 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */
653 /* struct ipsec_history */
654 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */
656 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
657 /* struct divert_info */
658 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
660 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
661 /* struct sockaddr_in */
662 #define PACKET_TAG_IPSRCRT 27 /* IP srcrt opts */
663 /* struct ip_srcrt_opt */
664 #define PACKET_TAG_CARP 28 /* CARP info */
666 #define PACKET_TAG_PF 29 /* PF info */
668 #define PACKET_TAG_PF_DIVERT 0x0200 /* pf(4) diverted packet */
671 /* Packet tag routines */
672 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
673 void m_tag_free(struct m_tag *);
674 void m_tag_prepend(struct mbuf *, struct m_tag *);
675 void m_tag_unlink(struct mbuf *, struct m_tag *);
676 void m_tag_delete(struct mbuf *, struct m_tag *);
677 void m_tag_delete_chain(struct mbuf *);
678 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
679 struct m_tag *m_tag_copy(struct m_tag *, int);
680 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
681 void m_tag_init(struct mbuf *);
682 struct m_tag *m_tag_first(struct mbuf *);
683 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *);
685 /* these are for openbsd compatibility */
686 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
688 static __inline void *
689 m_tag_data(struct m_tag *tag)
691 return ((void *)(tag + 1));
694 static __inline struct m_tag *
695 m_tag_get(int type, int length, int wait)
697 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
700 static __inline struct m_tag *
701 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
703 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
708 #endif /* _KERNEL || _KERNEL_STRUCTURES */
709 #endif /* !_SYS_MBUF_H_ */