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
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15 * 3. All advertising materials mentioning features or use of this software
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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))
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 hash; /* packet hash */
137 uint16_t wlan_seqno; /* IEEE 802.11 seq no. */
141 * Description of external storage mapped into mbuf; valid only if M_EXT is set.
144 caddr_t ext_buf; /* start of buffer */
145 void (*ext_free)(void *);
146 u_int ext_size; /* size of buffer, for ext_free */
147 void (*ext_ref)(void *);
152 * The core of the mbuf object along with some shortcut defines for
153 * practical purposes.
159 struct pkthdr MH_pkthdr; /* M_PKTHDR set */
161 struct m_ext MH_ext; /* M_EXT set */
162 char MH_databuf[MHLEN];
165 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
168 #define m_next m_hdr.mh_next
169 #define m_len m_hdr.mh_len
170 #define m_data m_hdr.mh_data
171 #define m_type m_hdr.mh_type
172 #define m_flags m_hdr.mh_flags
173 #define m_nextpkt m_hdr.mh_nextpkt
174 #define m_pkthdr M_dat.MH.MH_pkthdr
175 #define m_ext M_dat.MH.MH_dat.MH_ext
176 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
177 #define m_dat M_dat.M_databuf
180 * Code that uses m_act should be converted to use m_nextpkt
181 * instead; m_act is historical and deprecated.
183 #define m_act m_nextpkt
188 #define M_EXT 0x0001 /* has associated external storage */
189 #define M_PKTHDR 0x0002 /* start of record */
190 #define M_EOR 0x0004 /* end of record */
191 #define M_PROTO1 0x0008 /* protocol-specific */
192 #define M_PROTO2 0x0010 /* protocol-specific */
193 #define M_PROTO3 0x0020 /* protocol-specific */
194 #define M_PROTO4 0x0040 /* protocol-specific */
195 #define M_PROTO5 0x0080 /* protocol-specific */
198 * mbuf pkthdr flags (also stored in m_flags).
200 #define M_BCAST 0x0100 /* send/received as link-level broadcast */
201 #define M_MCAST 0x0200 /* send/received as link-level multicast */
202 #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */
203 #define M_FIRSTFRAG 0x0800 /* packet is first fragment */
204 #define M_LASTFRAG 0x1000 /* packet is last fragment */
205 #define M_CLCACHE 0x2000 /* mbuf allocated from the cluster cache */
206 #define M_EXT_CLUSTER 0x4000 /* standard cluster else special */
207 #define M_PHCACHE 0x8000 /* mbuf allocated from the pkt header cache */
208 #define M_NOTIFICATION 0x10000 /* notification event */
209 #define M_VLANTAG 0x20000 /* ether_vlantag is valid */
210 #define M_MPLSLABELED 0x40000 /* packet is mpls labeled */
211 #define M_LENCHECKED 0x80000 /* packet proto lengths are checked */
212 #define M_HASH 0x100000/* hash field in pkthdr is valid */
213 #define M_PROTO6 0x200000/* protocol-specific */
214 #define M_PROTO7 0x400000/* protocol-specific */
215 #define M_PROTO8 0x800000/* protocol-specific */
218 * Flags copied when copying m_pkthdr.
220 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO2|M_PROTO3 | \
221 M_PROTO4|M_PROTO5|M_PROTO6|M_PROTO7|M_PROTO8 | \
222 M_BCAST|M_MCAST|M_FRAG|M_FIRSTFRAG|M_LASTFRAG | \
223 M_VLANTAG|M_MPLSLABELED | \
227 * Flags indicating hw checksum support and sw checksum requirements.
229 #define CSUM_IP 0x0001 /* will csum IP */
230 #define CSUM_TCP 0x0002 /* will csum TCP */
231 #define CSUM_UDP 0x0004 /* will csum UDP */
232 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
233 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
235 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
236 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
237 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
238 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
239 #define CSUM_FRAG_NOT_CHECKED 0x1000 /* did _not_ csum fragment
240 * NB: This flag is only used
241 * by IP defragmenter.
244 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
245 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
248 * Flags indicating PF processing status
250 #define FW_MBUF_GENERATED 0x00000001
251 #define PF_MBUF_TAGGED 0x00000002 /* pf_tag field is valid */
252 #define PF_MBUF_ROUTED 0x00000004 /* pf_routed field is valid */
253 #define PF_MBUF_TRANSLATE_LOCALHOST \
255 #define PF_MBUF_FRAGCACHE 0x00000010
256 #define ALTQ_MBUF_TAGGED 0x00000020 /* altq_qid is valid */
257 #define IPFORWARD_MBUF_TAGGED 0x00000040
258 #define DUMMYNET_MBUF_TAGGED 0x00000080
259 #define ALTQ_MBUF_STATE_HASHED 0x00000100
260 #define FW_MBUF_REDISPATCH 0x00000200
261 #define PF_MBUF_GENERATED FW_MBUF_GENERATED
262 #define IPFW_MBUF_GENERATED FW_MBUF_GENERATED
267 #define MT_FREE 0 /* should be on free list */
268 #define MT_DATA 1 /* dynamic (data) allocation */
269 #define MT_HEADER 2 /* packet header */
270 #define MT_SONAME 3 /* socket name */
272 #define MT_CONTROL 5 /* extra-data protocol message */
273 #define MT_OOBDATA 6 /* expedited data */
274 #define MT_NTYPES 7 /* number of mbuf types for mbtypes[] */
277 struct mbuf *mc_head;
278 struct mbuf *mc_tail;
282 * General mbuf allocator statistics structure.
285 u_long m_mbufs; /* mbufs obtained from page pool */
286 u_long m_clusters; /* clusters obtained from page pool */
287 u_long m_spare; /* spare field */
288 u_long m_clfree; /* free clusters */
289 u_long m_drops; /* times failed to find space */
290 u_long m_wait; /* times waited for space */
291 u_long m_drain; /* times drained protocols for space */
292 u_long m_mcfail; /* times m_copym failed */
293 u_long m_mpfail; /* times m_pullup failed */
294 u_long m_msize; /* length of an mbuf */
295 u_long m_mclbytes; /* length of an mbuf cluster */
296 u_long m_minclsize; /* min length of data to allocate a cluster */
297 u_long m_mlen; /* length of data in an mbuf */
298 u_long m_mhlen; /* length of data in a header mbuf */
302 * Flags specifying how an allocation should be made.
305 #define MB_DONTWAIT 0x4
306 #define MB_TRYWAIT 0x8
307 #define MB_WAIT MB_TRYWAIT
310 * Mbuf to Malloc Flag Conversion.
312 #define MBTOM(how) ((how) & MB_TRYWAIT ? M_WAITOK : M_NOWAIT)
315 * These are identifying numbers passed to the m_mballoc_wait function,
316 * allowing us to determine whether the call came from an MGETHDR or
323 * mbuf allocation/deallocation macros (YYY deprecated, too big):
325 * MGET(struct mbuf *m, int how, int type)
326 * allocates an mbuf and initializes it to contain internal data.
328 * MGETHDR(struct mbuf *m, int how, int type)
329 * allocates an mbuf and initializes it to contain a packet header
332 #define MGET(m, how, type) do { \
333 (m) = m_get((how), (type)); \
336 #define MGETHDR(m, how, type) do { \
337 (m) = m_gethdr((how), (type)); \
341 * MCLGET adds such clusters to a normal mbuf. The flag M_EXT is set upon
343 * Deprecated. Use m_getcl() or m_getl() instead.
345 #define MCLGET(m, how) do { \
346 m_mclget((m), (how)); \
350 * NB: M_COPY_PKTHDR is deprecated; use either M_MOVE_PKTHDR
354 * Move mbuf pkthdr from "from" to "to".
355 * from should have M_PKTHDR set, and to must be empty.
356 * from no longer has a pkthdr after this operation.
358 #define M_MOVE_PKTHDR(_to, _from) m_move_pkthdr((_to), (_from))
361 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
362 * an object of the specified size at the end of the mbuf, longword aligned.
364 #define M_ALIGN(m, len) do { \
365 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
369 * As above, for mbufs allocated with m_gethdr/MGETHDR
370 * or initialized by M_COPY_PKTHDR.
372 #define MH_ALIGN(m, len) do { \
373 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
377 * Check if we can write to an mbuf.
379 #define M_EXT_WRITABLE(m) (m_sharecount(m) == 1)
380 #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || M_EXT_WRITABLE(m))
383 * Check if the supplied mbuf has a packet header, or else panic.
385 #define M_ASSERTPKTHDR(m) \
386 KASSERT(m != NULL && m->m_flags & M_PKTHDR, \
387 ("%s: invalid mbuf or no mbuf packet header!", __func__))
390 * Compute the amount of space available before the current start of data.
391 * The M_EXT_WRITABLE() is a temporary, conservative safety measure: the burden
392 * of checking writability of the mbuf data area rests solely with the caller.
394 #define M_LEADINGSPACE(m) \
395 ((m)->m_flags & M_EXT ? \
396 (M_EXT_WRITABLE(m) ? (m)->m_data - (m)->m_ext.ext_buf : 0): \
397 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
398 (m)->m_data - (m)->m_dat)
401 * Compute the amount of space available after the end of data in an mbuf.
402 * The M_WRITABLE() is a temporary, conservative safety measure: the burden
403 * of checking writability of the mbuf data area rests solely with the caller.
405 #define M_TRAILINGSPACE(m) \
406 ((m)->m_flags & M_EXT ? \
407 (M_WRITABLE(m) ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size \
408 - ((m)->m_data + (m)->m_len) : 0) : \
409 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
412 * Arrange to prepend space of size plen to mbuf m.
413 * If a new mbuf must be allocated, how specifies whether to wait.
414 * If how is MB_DONTWAIT and allocation fails, the original mbuf chain
415 * is freed and m is set to NULL.
417 #define M_PREPEND(m, plen, how) do { \
418 struct mbuf **_mmp = &(m); \
419 struct mbuf *_mm = *_mmp; \
420 int _mplen = (plen); \
421 int __mhow = (how); \
423 if (M_LEADINGSPACE(_mm) >= _mplen) { \
424 _mm->m_data -= _mplen; \
425 _mm->m_len += _mplen; \
427 _mm = m_prepend(_mm, _mplen, __mhow); \
428 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
429 _mm->m_pkthdr.len += _mplen; \
433 /* Length to m_copy to copy all. */
434 #define M_COPYALL 1000000000
436 /* Compatibility with 4.3 */
437 #define m_copy(m, o, l) m_copym((m), (o), (l), MB_DONTWAIT)
440 extern u_int m_clalloc_wid; /* mbuf cluster wait count */
441 extern u_int m_mballoc_wid; /* mbuf wait count */
442 extern int max_linkhdr; /* largest link-level header */
443 extern int max_protohdr; /* largest protocol header */
444 extern int max_hdr; /* largest link+protocol header */
445 extern int max_datalen; /* MHLEN - max_hdr */
446 extern int mbuf_wait; /* mbuf sleep time */
447 extern int nmbclusters;
452 void m_adj(struct mbuf *, int);
453 void m_align(struct mbuf *, int);
454 int m_apply(struct mbuf *, int, int,
455 int (*)(void *, void *, u_int), void *);
456 int m_append(struct mbuf *, int, c_caddr_t);
457 void m_cat(struct mbuf *, struct mbuf *);
458 u_int m_countm(struct mbuf *m, struct mbuf **lastm, u_int *mbcnt);
459 void m_copyback(struct mbuf *, int, int, caddr_t);
460 void m_copydata(const struct mbuf *, int, int, caddr_t);
461 struct mbuf *m_copym(const struct mbuf *, int, int, int);
462 struct mbuf *m_copypacket(struct mbuf *, int);
463 struct mbuf *m_defrag(struct mbuf *, int);
464 struct mbuf *m_defrag_nofree(struct mbuf *, int);
465 struct mbuf *m_devget(char *, int, int, struct ifnet *,
466 void (*copy)(volatile const void *, volatile void *, size_t));
467 struct mbuf *m_dup(struct mbuf *, int);
468 int m_dup_pkthdr(struct mbuf *, const struct mbuf *, int);
469 struct mbuf *m_free(struct mbuf *);
470 void m_freem(struct mbuf *);
471 struct mbuf *m_get(int, int);
472 struct mbuf *m_getc(int len, int how, int type);
473 struct mbuf *m_getcl(int how, short type, int flags);
474 struct mbuf *m_getclr(int, int);
475 struct mbuf *m_gethdr(int, int);
476 struct mbuf *m_getm(struct mbuf *, int, int, int);
477 struct mbuf *m_getptr(struct mbuf *, int, int *);
478 struct mbuf *m_last(struct mbuf *m);
479 u_int m_lengthm(struct mbuf *m, struct mbuf **lastm);
480 void m_move_pkthdr(struct mbuf *, struct mbuf *);
481 struct mbuf *m_prepend(struct mbuf *, int, int);
482 void m_print(const struct mbuf *m);
483 struct mbuf *m_pulldown(struct mbuf *, int, int, int *);
484 struct mbuf *m_pullup(struct mbuf *, int);
485 struct mbuf *m_split(struct mbuf *, int, int);
486 struct mbuf *m_uiomove(struct uio *);
487 void m_mclget(struct mbuf *m, int how);
488 int m_sharecount(struct mbuf *m);
489 void m_chtype(struct mbuf *m, int type);
490 int m_devpad(struct mbuf *m, int padto);
493 void mbuftrackid(struct mbuf *, int);
495 #define mbuftrackid(m, id) /* empty */
499 * Allocate the right type of mbuf for the desired total length.
500 * The mbuf returned does not necessarily cover the entire requested length.
501 * This function follows mbuf chaining policy of allowing MINCLSIZE
502 * amount of chained mbufs.
504 static __inline struct mbuf *
505 m_getl(int len, int how, int type, int flags, int *psize)
510 if (len >= MINCLSIZE) {
511 m = m_getcl(how, type, flags);
513 } else if (flags & M_PKTHDR) {
514 m = m_gethdr(how, type);
517 m = m_get(how, type);
526 * Get a single mbuf that covers the requested number of bytes.
527 * This function does not create mbuf chains. It explicitly marks
528 * places in the code that abuse mbufs for contiguous data buffers.
530 static __inline struct mbuf *
531 m_getb(int len, int how, int type, int flags)
534 int mbufsize = (flags & M_PKTHDR) ? MHLEN : MLEN;
537 m = m_getcl(how, type, flags);
538 else if (flags & M_PKTHDR)
539 m = m_gethdr(how, type);
541 m = m_get(how, type);
546 * Packets may have annotations attached by affixing a list
547 * of "packet tags" to the pkthdr structure. Packet tags are
548 * dynamically allocated semi-opaque data structures that have
549 * a fixed header (struct m_tag) that specifies the size of the
550 * memory block and a <cookie,type> pair that identifies it.
551 * The cookie is a 32-bit unique unsigned value used to identify
552 * a module or ABI. By convention this value is chose as the
553 * date+time that the module is created, expressed as the number of
554 * seconds since the epoch (e.g. using date -u +'%s'). The type value
555 * is an ABI/module-specific value that identifies a particular annotation
556 * and is private to the module. For compatibility with systems
557 * like openbsd that define packet tags w/o an ABI/module cookie,
558 * the value PACKET_ABI_COMPAT is used to implement m_tag_get and
559 * m_tag_find compatibility shim functions and several tag types are
560 * defined below. Users that do not require compatibility should use
561 * a private cookie value so that packet tag-related definitions
562 * can be maintained privately.
564 * Note that the packet tag returned by m_tag_alloc has the default
565 * memory alignment implemented by kmalloc. To reference private data
566 * one can use a construct like:
568 * struct m_tag *mtag = m_tag_alloc(...);
569 * struct foo *p = m_tag_data(mtag);
571 * if the alignment of struct m_tag is sufficient for referencing members
572 * of struct foo. Otherwise it is necessary to embed struct m_tag within
573 * the private data structure to insure proper alignment; e.g.
579 * struct foo *p = (struct foo *)m_tag_alloc(...);
580 * struct m_tag *mtag = &p->tag;
583 #define PACKET_TAG_NONE 0 /* Nadda */
585 /* Packet tag for use with PACKET_ABI_COMPAT */
586 #define PACKET_TAG_IPSEC_IN_DONE 1 /* IPsec applied, in */
587 /* struct tdb_indent */
588 #define PACKET_TAG_IPSEC_OUT_DONE 2 /* IPsec applied, out */
589 /* struct tdb_indent */
590 #define PACKET_TAG_IPSEC_IN_CRYPTO_DONE 3 /* NIC IPsec crypto done */
591 /* struct tdb_indent, never added */
592 #define PACKET_TAG_IPSEC_OUT_CRYPTO_NEEDED 4 /* NIC IPsec crypto req'ed */
593 /* struct tdb_indent, never added */
594 #define PACKET_TAG_IPSEC_PENDING_TDB 5 /* Reminder to do IPsec */
595 /* struct tdb_indent, never added */
596 #define PACKET_TAG_ENCAP 6 /* Encap. processing */
597 /* struct ifnet *, the GIF interface */
598 #define PACKET_TAG_IPSEC_HISTORY 7 /* IPSEC history */
599 /* struct ipsec_history */
600 #define PACKET_TAG_IPV6_INPUT 8 /* IPV6 input processing */
602 #define PACKET_TAG_IPFW_DIVERT 9 /* divert info */
603 /* struct divert_info */
604 #define PACKET_TAG_DUMMYNET 15 /* dummynet info */
606 #define PACKET_TAG_IPFORWARD 18 /* ipforward info */
607 /* struct sockaddr_in */
608 #define PACKET_TAG_IPSRCRT 27 /* IP srcrt opts */
609 /* struct ip_srcrt_opt */
610 #define PACKET_TAG_CARP 28 /* CARP info */
612 /* Packet tag routines */
613 struct m_tag *m_tag_alloc(u_int32_t, int, int, int);
614 void m_tag_free(struct m_tag *);
615 void m_tag_prepend(struct mbuf *, struct m_tag *);
616 void m_tag_unlink(struct mbuf *, struct m_tag *);
617 void m_tag_delete(struct mbuf *, struct m_tag *);
618 void m_tag_delete_chain(struct mbuf *);
619 struct m_tag *m_tag_locate(struct mbuf *, u_int32_t, int, struct m_tag *);
620 struct m_tag *m_tag_copy(struct m_tag *, int);
621 int m_tag_copy_chain(struct mbuf *, const struct mbuf *, int);
622 void m_tag_init(struct mbuf *);
623 struct m_tag *m_tag_first(struct mbuf *);
624 struct m_tag *m_tag_next(struct mbuf *, struct m_tag *);
626 /* these are for openbsd compatibility */
627 #define MTAG_ABI_COMPAT 0 /* compatibility ABI */
629 static __inline void *
630 m_tag_data(struct m_tag *tag)
632 return ((void *)(tag + 1));
635 static __inline struct m_tag *
636 m_tag_get(int type, int length, int wait)
638 return m_tag_alloc(MTAG_ABI_COMPAT, type, length, wait);
641 static __inline struct m_tag *
642 m_tag_find(struct mbuf *m, int type, struct m_tag *start)
644 return m_tag_locate(m, MTAG_ABI_COMPAT, type, start);
649 #endif /* _KERNEL || _KERNEL_STRUCTURES */
650 #endif /* !_SYS_MBUF_H_ */