2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)mbuf.h 8.5 (Berkeley) 2/19/95
40 #include <sys/mutex.h> /* XXX */
43 * Mbufs are of a single size, MSIZE (machine/param.h), which
44 * includes overhead. An mbuf may add a single "mbuf cluster" of size
45 * MCLBYTES (also in machine/param.h), which has no additional overhead
46 * and is used instead of the internal data area; this is done when
47 * at least MINCLSIZE of data must be stored.
50 #define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */
51 #define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */
53 #define MINCLSIZE (MHLEN + 1) /* smallest amount to put in cluster */
54 #define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */
57 * Maximum number of allocatable counters for external buffers. This
58 * ensures enough VM address space for the allocation of counters
59 * in the extreme case where all possible external buffers are allocated.
61 * Note: When new types of external storage are allocated, EXT_COUNTERS
62 * must be tuned accordingly. Practically, this isn't a big deal
63 * as each counter is only a word long, so we can fit
64 * (PAGE_SIZE / length of word) counters in a single page.
66 * XXX: Must increase this if using any of if_ti, if_wb, if_sk drivers,
67 * or any other drivers which may manage their own buffers and
68 * eventually attach them to mbufs.
70 #define EXT_COUNTERS (nmbclusters + nsfbufs)
73 * Macros for type conversion
74 * mtod(m, t) - convert mbuf pointer to data pointer of correct type
75 * dtom(x) - convert data pointer within mbuf to mbuf pointer (XXX)
77 #define mtod(m, t) ((t)((m)->m_data))
78 #define dtom(x) ((struct mbuf *)((intptr_t)(x) & ~(MSIZE-1)))
80 /* header at beginning of each 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 short mh_type; /* type of data in this mbuf */
87 short mh_flags; /* flags; see below */
90 /* record/packet header in first mbuf of chain; valid if M_PKTHDR set */
92 struct ifnet *rcvif; /* rcv interface */
93 int len; /* total packet length */
94 /* variables for ip and tcp reassembly */
95 void *header; /* pointer to packet header */
96 /* variables for hardware checksum */
97 int csum_flags; /* flags regarding checksum */
98 int csum_data; /* data field used by csum routines */
99 struct mbuf *aux; /* extra data buffer; ipsec/others */
102 /* description of external storage mapped into mbuf, valid if M_EXT set */
104 caddr_t ext_buf; /* start of buffer */
105 void (*ext_free) /* free routine if not the usual */
106 __P((caddr_t, void *));
107 void *ext_args; /* optional argument pointer */
108 u_int ext_size; /* size of buffer, for ext_free */
109 union mext_refcnt *ref_cnt; /* pointer to ref count info */
110 int ext_type; /* type of external storage */
117 struct pkthdr MH_pkthdr; /* M_PKTHDR set */
119 struct m_ext MH_ext; /* M_EXT set */
120 char MH_databuf[MHLEN];
123 char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
126 #define m_next m_hdr.mh_next
127 #define m_len m_hdr.mh_len
128 #define m_data m_hdr.mh_data
129 #define m_type m_hdr.mh_type
130 #define m_flags m_hdr.mh_flags
131 #define m_nextpkt m_hdr.mh_nextpkt
132 #define m_act m_nextpkt
133 #define m_pkthdr M_dat.MH.MH_pkthdr
134 #define m_ext M_dat.MH.MH_dat.MH_ext
135 #define m_pktdat M_dat.MH.MH_dat.MH_databuf
136 #define m_dat M_dat.M_databuf
139 #define M_EXT 0x0001 /* has associated external storage */
140 #define M_PKTHDR 0x0002 /* start of record */
141 #define M_EOR 0x0004 /* end of record */
142 #define M_RDONLY 0x0008 /* associated data is marked read-only */
143 #define M_PROTO1 0x0010 /* protocol-specific */
144 #define M_PROTO2 0x0020 /* protocol-specific */
145 #define M_PROTO3 0x0040 /* protocol-specific */
146 #define M_PROTO4 0x0080 /* protocol-specific */
147 #define M_PROTO5 0x0100 /* protocol-specific */
149 /* mbuf pkthdr flags, also in m_flags */
150 #define M_BCAST 0x0200 /* send/received as link-level broadcast */
151 #define M_MCAST 0x0400 /* send/received as link-level multicast */
152 #define M_FRAG 0x0800 /* packet is a fragment of a larger packet */
153 #define M_FIRSTFRAG 0x1000 /* packet is first fragment */
154 #define M_LASTFRAG 0x2000 /* packet is last fragment */
156 /* external buffer types: identify ext_buf type */
157 #define EXT_CLUSTER 1 /* mbuf cluster */
158 #define EXT_SFBUF 2 /* sendfile(2)'s sf_bufs */
159 #define EXT_NET_DRV 100 /* custom ext_buf provided by net driver(s) */
160 #define EXT_MOD_TYPE 200 /* custom module's ext_buf type */
162 /* flags copied when copying m_pkthdr */
163 #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \
164 M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG|M_RDONLY)
166 /* flags indicating hw checksum support and sw checksum requirements */
167 #define CSUM_IP 0x0001 /* will csum IP */
168 #define CSUM_TCP 0x0002 /* will csum TCP */
169 #define CSUM_UDP 0x0004 /* will csum UDP */
170 #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */
171 #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */
173 #define CSUM_IP_CHECKED 0x0100 /* did csum IP */
174 #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */
175 #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */
176 #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */
178 #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP)
179 #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */
182 #define MT_FREE 0 /* should be on free list */
183 #define MT_DATA 1 /* dynamic (data) allocation */
184 #define MT_HEADER 2 /* packet header */
186 #define MT_SOCKET 3 /* socket structure */
187 #define MT_PCB 4 /* protocol control block */
188 #define MT_RTABLE 5 /* routing tables */
189 #define MT_HTABLE 6 /* IMP host tables */
190 #define MT_ATABLE 7 /* address resolution tables */
192 #define MT_SONAME 8 /* socket name */
194 #define MT_SOOPTS 10 /* socket options */
196 #define MT_FTABLE 11 /* fragment reassembly header */
198 #define MT_RIGHTS 12 /* access rights */
199 #define MT_IFADDR 13 /* interface address */
201 #define MT_CONTROL 14 /* extra-data protocol message */
202 #define MT_OOBDATA 15 /* expedited data */
204 #define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */
210 u_long m_mbufs; /* # mbufs obtained from page pool */
211 u_long m_clusters; /* # clusters obtained from page pool */
212 u_long m_clfree; /* # clusters on freelist (cache) */
213 u_long m_refcnt; /* # ref counters obtained from page pool */
214 u_long m_refree; /* # ref counters on freelist (cache) */
215 u_long m_spare; /* spare field */
216 u_long m_drops; /* times failed to find space */
217 u_long m_wait; /* times waited for space */
218 u_long m_drain; /* times drained protocols for space */
219 u_long m_mcfail; /* times m_copym failed */
220 u_long m_mpfail; /* times m_pullup failed */
221 u_long m_msize; /* length of an mbuf */
222 u_long m_mclbytes; /* length of an mbuf cluster */
223 u_long m_minclsize; /* min length of data to allocate a cluster */
224 u_long m_mlen; /* length of data in an mbuf */
225 u_long m_mhlen; /* length of data in a header mbuf */
228 /* flags to m_get/MGET */
233 * Normal mbuf clusters are normally treated as character arrays
234 * after allocation, but use the first word of the buffer as a free list
235 * pointer while on the free list.
238 union mcluster *mcl_next;
239 char mcl_buf[MCLBYTES];
243 * The m_ext object reference counter structure.
246 union mext_refcnt *next_ref;
251 * free list header definitions: mbffree_lst, mclfree_lst, mcntfree_lst
259 union mcluster *m_head;
263 struct mcntfree_lst {
264 union mext_refcnt *m_head;
269 * Wake up the next instance (if any) of a sleeping allocation - which is
270 * waiting for a {cluster, mbuf} to be freed.
272 * Must be called with the appropriate mutex held.
274 #define MBWAKEUP(m_wid) do { \
277 wakeup_one(&(m_wid)); \
282 * mbuf external reference count management macros:
284 * MEXT_IS_REF(m): true if (m) is not the only mbuf referencing
285 * the external buffer ext_buf
286 * MEXT_REM_REF(m): remove reference to m_ext object
287 * MEXT_ADD_REF(m): add reference to m_ext object already
289 * MEXT_INIT_REF(m): allocate and initialize an external
290 * object reference counter for (m)
292 #define MEXT_IS_REF(m) ((m)->m_ext.ref_cnt->refcnt > 1)
294 #define MEXT_REM_REF(m) do { \
295 KASSERT((m)->m_ext.ref_cnt->refcnt > 0, ("m_ext refcnt < 0")); \
296 atomic_subtract_long(&((m)->m_ext.ref_cnt->refcnt), 1); \
299 #define MEXT_ADD_REF(m) atomic_add_long(&((m)->m_ext.ref_cnt->refcnt), 1)
301 #define _MEXT_ALLOC_CNT(m_cnt, how) do { \
302 union mext_refcnt *__mcnt; \
304 mtx_enter(&mcntfree.m_mtx, MTX_DEF); \
305 if (mcntfree.m_head == NULL) \
306 m_alloc_ref(1, (how)); \
307 __mcnt = mcntfree.m_head; \
308 if (__mcnt != NULL) { \
309 mcntfree.m_head = __mcnt->next_ref; \
311 __mcnt->refcnt = 0; \
313 mtx_exit(&mcntfree.m_mtx, MTX_DEF); \
317 #define _MEXT_DEALLOC_CNT(m_cnt) do { \
318 union mext_refcnt *__mcnt = (m_cnt); \
320 mtx_enter(&mcntfree.m_mtx, MTX_DEF); \
321 __mcnt->next_ref = mcntfree.m_head; \
322 mcntfree.m_head = __mcnt; \
324 mtx_exit(&mcntfree.m_mtx, MTX_DEF); \
327 #define MEXT_INIT_REF(m, how) do { \
328 struct mbuf *__mmm = (m); \
330 _MEXT_ALLOC_CNT(__mmm->m_ext.ref_cnt, (how)); \
331 if (__mmm->m_ext.ref_cnt != NULL) \
332 MEXT_ADD_REF(__mmm); \
336 * mbuf allocation/deallocation macros:
338 * MGET(struct mbuf *m, int how, int type)
339 * allocates an mbuf and initializes it to contain internal data.
341 * MGETHDR(struct mbuf *m, int how, int type)
342 * allocates an mbuf and initializes it to contain a packet header
346 * Lower-level macros for MGET(HDR)... Not to be used outside the
347 * subsystem ("non-exportable" macro names are prepended with "_").
349 #define _MGET_SETUP(m_set, m_set_type) do { \
350 (m_set)->m_type = (m_set_type); \
351 (m_set)->m_next = NULL; \
352 (m_set)->m_nextpkt = NULL; \
353 (m_set)->m_data = (m_set)->m_dat; \
354 (m_set)->m_flags = 0; \
357 #define _MGET(m_mget, m_get_how) do { \
358 if (mmbfree.m_head == NULL) \
359 m_mballoc(1, (m_get_how)); \
360 (m_mget) = mmbfree.m_head; \
361 if ((m_mget) != NULL) { \
362 mmbfree.m_head = (m_mget)->m_next; \
363 mbtypes[MT_FREE]--; \
365 if ((m_get_how) == M_WAIT) \
366 (m_mget) = m_mballoc_wait(); \
370 #define MGET(m, how, type) do { \
373 int _mtype = (type); \
375 mtx_enter(&mmbfree.m_mtx, MTX_DEF); \
379 mtx_exit(&mmbfree.m_mtx, MTX_DEF); \
380 _MGET_SETUP(_mm, _mtype); \
382 mtx_exit(&mmbfree.m_mtx, MTX_DEF); \
386 #define _MGETHDR_SETUP(m_set, m_set_type) do { \
387 (m_set)->m_type = (m_set_type); \
388 (m_set)->m_next = NULL; \
389 (m_set)->m_nextpkt = NULL; \
390 (m_set)->m_data = (m_set)->m_pktdat; \
391 (m_set)->m_flags = M_PKTHDR; \
392 (m_set)->m_pkthdr.rcvif = NULL; \
393 (m_set)->m_pkthdr.csum_flags = 0; \
394 (m_set)->m_pkthdr.aux = NULL; \
397 #define MGETHDR(m, how, type) do { \
400 int _mtype = (type); \
402 mtx_enter(&mmbfree.m_mtx, MTX_DEF); \
406 mtx_exit(&mmbfree.m_mtx, MTX_DEF); \
407 _MGETHDR_SETUP(_mm, _mtype); \
409 mtx_exit(&mmbfree.m_mtx, MTX_DEF); \
414 * mbuf external storage macros:
416 * MCLGET allocates and refers an mcluster to an mbuf
417 * MEXTADD sets up pre-allocated external storage and refers to mbuf
418 * MEXTFREE removes reference to external object and frees it if
421 #define _MCLALLOC(p, how) do { \
425 if (mclfree.m_head == NULL) \
426 m_clalloc(1, _mhow); \
427 _mp = (caddr_t)mclfree.m_head; \
430 mclfree.m_head = ((union mcluster *)_mp)->mcl_next; \
432 if (_mhow == M_WAIT) \
433 _mp = m_clalloc_wait(); \
438 #define MCLGET(m, how) do { \
439 struct mbuf *_mm = (m); \
441 mtx_enter(&mclfree.m_mtx, MTX_DEF); \
442 _MCLALLOC(_mm->m_ext.ext_buf, (how)); \
443 mtx_exit(&mclfree.m_mtx, MTX_DEF); \
444 if (_mm->m_ext.ext_buf != NULL) { \
445 MEXT_INIT_REF(_mm, (how)); \
446 if (_mm->m_ext.ref_cnt == NULL) { \
447 _MCLFREE(_mm->m_ext.ext_buf); \
448 _mm->m_ext.ext_buf = NULL; \
450 _mm->m_data = _mm->m_ext.ext_buf; \
451 _mm->m_flags |= M_EXT; \
452 _mm->m_ext.ext_free = NULL; \
453 _mm->m_ext.ext_args = NULL; \
454 _mm->m_ext.ext_size = MCLBYTES; \
455 _mm->m_ext.ext_type = EXT_CLUSTER; \
460 #define MEXTADD(m, buf, size, free, args, flags, type) do { \
461 struct mbuf *_mm = (m); \
463 MEXT_INIT_REF(_mm, M_WAIT); \
464 if (_mm->m_ext.ref_cnt != NULL) { \
465 _mm->m_flags |= (M_EXT | (flags)); \
466 _mm->m_ext.ext_buf = (caddr_t)(buf); \
467 _mm->m_data = _mm->m_ext.ext_buf; \
468 _mm->m_ext.ext_size = (size); \
469 _mm->m_ext.ext_free = (free); \
470 _mm->m_ext.ext_args = (args); \
471 _mm->m_ext.ext_type = (type); \
475 #define _MCLFREE(p) do { \
476 union mcluster *_mp = (union mcluster *)(p); \
478 mtx_enter(&mclfree.m_mtx, MTX_DEF); \
479 _mp->mcl_next = mclfree.m_head; \
480 mclfree.m_head = _mp; \
482 MBWAKEUP(m_clalloc_wid); \
483 mtx_exit(&mclfree.m_mtx, MTX_DEF); \
486 #define MEXTFREE(m) do { \
487 struct mbuf *_mmm = (m); \
489 if (MEXT_IS_REF(_mmm)) \
490 MEXT_REM_REF(_mmm); \
491 else if (_mmm->m_ext.ext_type != EXT_CLUSTER) { \
492 (*(_mmm->m_ext.ext_free))(_mmm->m_ext.ext_buf, \
493 _mmm->m_ext.ext_args); \
494 _MEXT_DEALLOC_CNT(_mmm->m_ext.ref_cnt); \
496 _MCLFREE(_mmm->m_ext.ext_buf); \
497 _MEXT_DEALLOC_CNT(_mmm->m_ext.ref_cnt); \
499 _mmm->m_flags &= ~M_EXT; \
503 * MFREE(struct mbuf *m, struct mbuf *n)
504 * Free a single mbuf and associated external storage.
505 * Place the successor, if any, in n.
507 #define MFREE(m, n) do { \
508 struct mbuf *_mm = (m); \
510 KASSERT(_mm->m_type != MT_FREE, ("freeing free mbuf")); \
511 if (_mm->m_flags & M_EXT) \
513 mtx_enter(&mmbfree.m_mtx, MTX_DEF); \
514 mbtypes[_mm->m_type]--; \
515 _mm->m_type = MT_FREE; \
516 mbtypes[MT_FREE]++; \
518 _mm->m_next = mmbfree.m_head; \
519 mmbfree.m_head = _mm; \
520 MBWAKEUP(m_mballoc_wid); \
521 mtx_exit(&mmbfree.m_mtx, MTX_DEF); \
526 * Evaluate TRUE if it's safe to write to the mbuf m's data region (this
527 * can be both the local data payload, or an external buffer area,
528 * depending on whether M_EXT is set).
530 #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && (!((m)->m_flags \
531 & M_EXT) || !MEXT_IS_REF(m)))
534 * Copy mbuf pkthdr from "from" to "to".
535 * from must have M_PKTHDR set, and to must be empty.
536 * aux pointer will be moved to `to'.
538 #define M_COPY_PKTHDR(to, from) do { \
539 struct mbuf *_mfrom = (from); \
540 struct mbuf *_mto = (to); \
542 _mto->m_data = _mto->m_pktdat; \
543 _mto->m_flags = _mfrom->m_flags & M_COPYFLAGS; \
544 _mto->m_pkthdr = _mfrom->m_pkthdr; \
545 _mfrom->m_pkthdr.aux = (struct mbuf *)NULL; \
549 * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
550 * an object of the specified size at the end of the mbuf, longword aligned.
552 #define M_ALIGN(m, len) do { \
553 (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \
557 * As above, for mbufs allocated with m_gethdr/MGETHDR
558 * or initialized by M_COPY_PKTHDR.
560 #define MH_ALIGN(m, len) do { \
561 (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \
565 * Compute the amount of space available
566 * before the current start of data in an mbuf.
568 #define M_LEADINGSPACE(m) \
569 ((m)->m_flags & M_EXT ? \
570 /* (m)->m_data - (m)->m_ext.ext_buf */ 0 : \
571 (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
572 (m)->m_data - (m)->m_dat)
575 * Compute the amount of space available
576 * after the end of data in an mbuf.
578 #define M_TRAILINGSPACE(m) \
579 ((m)->m_flags & M_EXT ? (m)->m_ext.ext_buf + \
580 (m)->m_ext.ext_size - ((m)->m_data + (m)->m_len) : \
581 &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
584 * Arrange to prepend space of size plen to mbuf m.
585 * If a new mbuf must be allocated, how specifies whether to wait.
586 * If how is M_DONTWAIT and allocation fails, the original mbuf chain
587 * is freed and m is set to NULL.
589 #define M_PREPEND(m, plen, how) do { \
590 struct mbuf **_mmp = &(m); \
591 struct mbuf *_mm = *_mmp; \
592 int _mplen = (plen); \
593 int __mhow = (how); \
595 if (M_LEADINGSPACE(_mm) >= _mplen) { \
596 _mm->m_data -= _mplen; \
597 _mm->m_len += _mplen; \
599 _mm = m_prepend(_mm, _mplen, __mhow); \
600 if (_mm != NULL && _mm->m_flags & M_PKTHDR) \
601 _mm->m_pkthdr.len += _mplen; \
606 * change mbuf to new type
608 #define MCHTYPE(m, t) do { \
609 struct mbuf *_mm = (m); \
612 atomic_subtract_long(&mbtypes[_mm->m_type], 1); \
613 atomic_add_long(&mbtypes[_mt], 1); \
614 _mm->m_type = (_mt); \
617 /* length to m_copy to copy all */
618 #define M_COPYALL 1000000000
620 /* compatibility with 4.3 */
621 #define m_copy(m, o, l) m_copym((m), (o), (l), M_DONTWAIT)
624 * pkthdr.aux type tags.
632 extern u_long m_clalloc_wid; /* mbuf cluster wait count */
633 extern u_long m_mballoc_wid; /* mbuf wait count */
634 extern int max_linkhdr; /* largest link-level header */
635 extern int max_protohdr; /* largest protocol header */
636 extern int max_hdr; /* largest link+protocol header */
637 extern int max_datalen; /* MHLEN - max_hdr */
638 extern struct mbstat mbstat;
639 extern u_long mbtypes[MT_NTYPES]; /* per-type mbuf allocations */
640 extern int mbuf_wait; /* mbuf sleep time */
641 extern struct mbuf *mbutl; /* virtual address of mclusters */
642 extern struct mclfree_lst mclfree;
643 extern struct mbffree_lst mmbfree;
644 extern struct mcntfree_lst mcntfree;
645 extern int nmbclusters;
649 void m_adj __P((struct mbuf *, int));
650 int m_alloc_ref __P((u_int, int));
651 void m_cat __P((struct mbuf *,struct mbuf *));
652 int m_clalloc __P((int, int));
653 caddr_t m_clalloc_wait __P((void));
654 void m_copyback __P((struct mbuf *, int, int, caddr_t));
655 void m_copydata __P((struct mbuf *,int,int,caddr_t));
656 struct mbuf *m_copym __P((struct mbuf *, int, int, int));
657 struct mbuf *m_copypacket __P((struct mbuf *, int));
658 struct mbuf *m_devget __P((char *, int, int, struct ifnet *,
659 void (*copy)(char *, caddr_t, u_int)));
660 struct mbuf *m_dup __P((struct mbuf *, int));
661 struct mbuf *m_free __P((struct mbuf *));
662 void m_freem __P((struct mbuf *));
663 struct mbuf *m_get __P((int, int));
664 struct mbuf *m_getclr __P((int, int));
665 struct mbuf *m_gethdr __P((int, int));
666 int m_mballoc __P((int, int));
667 struct mbuf *m_mballoc_wait __P((void));
668 struct mbuf *m_prepend __P((struct mbuf *,int,int));
669 struct mbuf *m_pulldown __P((struct mbuf *, int, int, int *));
670 void m_print __P((const struct mbuf *m));
671 struct mbuf *m_pullup __P((struct mbuf *, int));
672 struct mbuf *m_split __P((struct mbuf *,int,int));
673 struct mbuf *m_aux_add __P((struct mbuf *, int, int));
674 struct mbuf *m_aux_find __P((struct mbuf *, int, int));
675 void m_aux_delete __P((struct mbuf *, struct mbuf *));
678 #endif /* !_SYS_MBUF_H_ */