/* * Copyright (c) 1982, 1986, 1988, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)mbuf.h 8.5 (Berkeley) 2/19/95 * $FreeBSD: head/sys/sys/mbuf.h 68622 2000-11-11 23:12:27Z bmilekic $ */ #ifndef _SYS_MBUF_H_ #define _SYS_MBUF_H_ #include /* XXX */ /* * Mbufs are of a single size, MSIZE (machine/param.h), which * includes overhead. An mbuf may add a single "mbuf cluster" of size * MCLBYTES (also in machine/param.h), which has no additional overhead * and is used instead of the internal data area; this is done when * at least MINCLSIZE of data must be stored. */ #define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */ #define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */ #define MINCLSIZE (MHLEN + 1) /* smallest amount to put in cluster */ #define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */ /* * Maximum number of allocatable counters for external buffers. This * ensures enough VM address space for the allocation of counters * in the extreme case where all possible external buffers are allocated. * * Note: When new types of external storage are allocated, EXT_COUNTERS * must be tuned accordingly. Practically, this isn't a big deal * as each counter is only a word long, so we can fit * (PAGE_SIZE / length of word) counters in a single page. * * XXX: Must increase this if using any of if_ti, if_wb, if_sk drivers, * or any other drivers which may manage their own buffers and * eventually attach them to mbufs. */ #define EXT_COUNTERS (nmbclusters + nsfbufs) /* * Macros for type conversion * mtod(m, t) - convert mbuf pointer to data pointer of correct type * dtom(x) - convert data pointer within mbuf to mbuf pointer (XXX) */ #define mtod(m, t) ((t)((m)->m_data)) #define dtom(x) ((struct mbuf *)((intptr_t)(x) & ~(MSIZE-1))) /* header at beginning of each mbuf: */ struct m_hdr { struct mbuf *mh_next; /* next buffer in chain */ struct mbuf *mh_nextpkt; /* next chain in queue/record */ caddr_t mh_data; /* location of data */ int mh_len; /* amount of data in this mbuf */ short mh_type; /* type of data in this mbuf */ short mh_flags; /* flags; see below */ }; /* record/packet header in first mbuf of chain; valid if M_PKTHDR set */ struct pkthdr { struct ifnet *rcvif; /* rcv interface */ int len; /* total packet length */ /* variables for ip and tcp reassembly */ void *header; /* pointer to packet header */ /* variables for hardware checksum */ int csum_flags; /* flags regarding checksum */ int csum_data; /* data field used by csum routines */ struct mbuf *aux; /* extra data buffer; ipsec/others */ }; /* description of external storage mapped into mbuf, valid if M_EXT set */ struct m_ext { caddr_t ext_buf; /* start of buffer */ void (*ext_free) /* free routine if not the usual */ __P((caddr_t, void *)); void *ext_args; /* optional argument pointer */ u_int ext_size; /* size of buffer, for ext_free */ union mext_refcnt *ref_cnt; /* pointer to ref count info */ short ext_type; /* type of external storage */ }; struct mbuf { struct m_hdr m_hdr; union { struct { struct pkthdr MH_pkthdr; /* M_PKTHDR set */ union { struct m_ext MH_ext; /* M_EXT set */ char MH_databuf[MHLEN]; } MH_dat; } MH; char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */ } M_dat; }; #define m_next m_hdr.mh_next #define m_len m_hdr.mh_len #define m_data m_hdr.mh_data #define m_type m_hdr.mh_type #define m_flags m_hdr.mh_flags #define m_nextpkt m_hdr.mh_nextpkt #define m_act m_nextpkt #define m_pkthdr M_dat.MH.MH_pkthdr #define m_ext M_dat.MH.MH_dat.MH_ext #define m_pktdat M_dat.MH.MH_dat.MH_databuf #define m_dat M_dat.M_databuf /* mbuf flags */ #define M_EXT 0x0001 /* has associated external storage */ #define M_PKTHDR 0x0002 /* start of record */ #define M_EOR 0x0004 /* end of record */ #define M_RDONLY 0x0008 /* associated data is marked read-only */ #define M_PROTO1 0x0010 /* protocol-specific */ #define M_PROTO2 0x0020 /* protocol-specific */ #define M_PROTO3 0x0040 /* protocol-specific */ #define M_PROTO4 0x0080 /* protocol-specific */ #define M_PROTO5 0x0100 /* protocol-specific */ /* mbuf pkthdr flags, also in m_flags */ #define M_BCAST 0x0200 /* send/received as link-level broadcast */ #define M_MCAST 0x0400 /* send/received as link-level multicast */ #define M_FRAG 0x0800 /* packet is a fragment of a larger packet */ #define M_FIRSTFRAG 0x1000 /* packet is first fragment */ #define M_LASTFRAG 0x2000 /* packet is last fragment */ /* external buffer types: identify ext_buf type */ #define EXT_CLUSTER 1 /* mbuf cluster */ #define EXT_SFBUF 2 /* sendfile(2)'s sf_bufs */ #define EXT_NET_DRV 100 /* custom ext_buf provided by net driver(s) */ /* flags copied when copying m_pkthdr */ #define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_PROTO1|M_PROTO2|M_PROTO3 | \ M_PROTO4|M_PROTO5|M_BCAST|M_MCAST|M_FRAG|M_RDONLY) /* flags indicating hw checksum support and sw checksum requirements */ #define CSUM_IP 0x0001 /* will csum IP */ #define CSUM_TCP 0x0002 /* will csum TCP */ #define CSUM_UDP 0x0004 /* will csum UDP */ #define CSUM_IP_FRAGS 0x0008 /* will csum IP fragments */ #define CSUM_FRAGMENT 0x0010 /* will do IP fragmentation */ #define CSUM_IP_CHECKED 0x0100 /* did csum IP */ #define CSUM_IP_VALID 0x0200 /* ... the csum is valid */ #define CSUM_DATA_VALID 0x0400 /* csum_data field is valid */ #define CSUM_PSEUDO_HDR 0x0800 /* csum_data has pseudo hdr */ #define CSUM_DELAY_DATA (CSUM_TCP | CSUM_UDP) #define CSUM_DELAY_IP (CSUM_IP) /* XXX add ipv6 here too? */ /* mbuf types */ #define MT_FREE 0 /* should be on free list */ #define MT_DATA 1 /* dynamic (data) allocation */ #define MT_HEADER 2 /* packet header */ #if 0 #define MT_SOCKET 3 /* socket structure */ #define MT_PCB 4 /* protocol control block */ #define MT_RTABLE 5 /* routing tables */ #define MT_HTABLE 6 /* IMP host tables */ #define MT_ATABLE 7 /* address resolution tables */ #endif #define MT_SONAME 8 /* socket name */ #if 0 #define MT_SOOPTS 10 /* socket options */ #endif #define MT_FTABLE 11 /* fragment reassembly header */ #if 0 #define MT_RIGHTS 12 /* access rights */ #define MT_IFADDR 13 /* interface address */ #endif #define MT_CONTROL 14 /* extra-data protocol message */ #define MT_OOBDATA 15 /* expedited data */ #define MT_NTYPES 16 /* number of mbuf types for mbtypes[] */ /* * mbuf statistics */ struct mbstat { u_long m_mbufs; /* # mbufs obtained from page pool */ u_long m_clusters; /* # clusters obtained from page pool */ u_long m_clfree; /* # clusters on freelist (cache) */ u_long m_refcnt; /* # ref counters obtained from page pool */ u_long m_refree; /* # ref counters on freelist (cache) */ u_long m_spare; /* spare field */ u_long m_drops; /* times failed to find space */ u_long m_wait; /* times waited for space */ u_long m_drain; /* times drained protocols for space */ u_long m_mcfail; /* times m_copym failed */ u_long m_mpfail; /* times m_pullup failed */ u_long m_msize; /* length of an mbuf */ u_long m_mclbytes; /* length of an mbuf cluster */ u_long m_minclsize; /* min length of data to allocate a cluster */ u_long m_mlen; /* length of data in an mbuf */ u_long m_mhlen; /* length of data in a header mbuf */ }; /* flags to m_get/MGET */ #define M_DONTWAIT 1 #define M_WAIT 0 /* * Normal mbuf clusters are normally treated as character arrays * after allocation, but use the first word of the buffer as a free list * pointer while on the free list. */ union mcluster { union mcluster *mcl_next; char mcl_buf[MCLBYTES]; }; /* * The m_ext object reference counter structure. */ union mext_refcnt { union mext_refcnt *next_ref; u_long refcnt; }; /* * free list header definitions: mbffree_lst, mclfree_lst, mcntfree_lst */ struct mbffree_lst { struct mbuf *m_head; struct mtx m_mtx; }; struct mclfree_lst { union mcluster *m_head; struct mtx m_mtx; }; struct mcntfree_lst { union mext_refcnt *m_head; struct mtx m_mtx; }; /* * Wake up the next instance (if any) of a sleeping allocation - which is * waiting for a {cluster, mbuf} to be freed. * * Must be called with the appropriate mutex held. */ #define MBWAKEUP(m_wid) do { \ if ((m_wid)) { \ m_wid--; \ wakeup_one(&(m_wid)); \ } \ } while (0) /* * mbuf external reference count management macros: * * MEXT_IS_REF(m): true if (m) is not the only mbuf referencing * the external buffer ext_buf * MEXT_REM_REF(m): remove reference to m_ext object * MEXT_ADD_REF(m): add reference to m_ext object already * referred to by (m) * MEXT_INIT_REF(m): allocate and initialize an external * object reference counter for (m) */ #define MEXT_IS_REF(m) ((m)->m_ext.ref_cnt->refcnt > 1) #define MEXT_REM_REF(m) do { \ KASSERT((m)->m_ext.ref_cnt->refcnt > 0, ("m_ext refcnt < 0")); \ atomic_subtract_long(&((m)->m_ext.ref_cnt->refcnt), 1); \ } while(0) #define MEXT_ADD_REF(m) atomic_add_long(&((m)->m_ext.ref_cnt->refcnt), 1) #define _MEXT_ALLOC_CNT(m_cnt, how) do { \ union mext_refcnt *__mcnt; \ \ mtx_enter(&mcntfree.m_mtx, MTX_DEF); \ if (mcntfree.m_head == NULL) \ m_alloc_ref(1, (how)); \ __mcnt = mcntfree.m_head; \ if (__mcnt != NULL) { \ mcntfree.m_head = __mcnt->next_ref; \ mbstat.m_refree--; \ __mcnt->refcnt = 0; \ } \ mtx_exit(&mcntfree.m_mtx, MTX_DEF); \ (m_cnt) = __mcnt; \ } while (0) #define _MEXT_DEALLOC_CNT(m_cnt) do { \ union mext_refcnt *__mcnt = (m_cnt); \ \ mtx_enter(&mcntfree.m_mtx, MTX_DEF); \ __mcnt->next_ref = mcntfree.m_head; \ mcntfree.m_head = __mcnt; \ mbstat.m_refree++; \ mtx_exit(&mcntfree.m_mtx, MTX_DEF); \ } while (0) #define MEXT_INIT_REF(m, how) do { \ struct mbuf *__mmm = (m); \ \ _MEXT_ALLOC_CNT(__mmm->m_ext.ref_cnt, (how)); \ if (__mmm->m_ext.ref_cnt != NULL) \ MEXT_ADD_REF(__mmm); \ } while (0) /* * mbuf allocation/deallocation macros: * * MGET(struct mbuf *m, int how, int type) * allocates an mbuf and initializes it to contain internal data. * * MGETHDR(struct mbuf *m, int how, int type) * allocates an mbuf and initializes it to contain a packet header * and internal data. */ /* * Lower-level macros for MGET(HDR)... Not to be used outside the * subsystem ("non-exportable" macro names are prepended with "_"). */ #define _MGET_SETUP(m_set, m_set_type) do { \ (m_set)->m_type = (m_set_type); \ (m_set)->m_next = NULL; \ (m_set)->m_nextpkt = NULL; \ (m_set)->m_data = (m_set)->m_dat; \ (m_set)->m_flags = 0; \ } while (0) #define _MGET(m_mget, m_get_how) do { \ if (mmbfree.m_head == NULL) \ m_mballoc(1, (m_get_how)); \ (m_mget) = mmbfree.m_head; \ if ((m_mget) != NULL) { \ mmbfree.m_head = (m_mget)->m_next; \ mbtypes[MT_FREE]--; \ } else { \ if ((m_get_how) == M_WAIT) \ (m_mget) = m_mballoc_wait(); \ } \ } while (0) #define MGET(m, how, type) do { \ struct mbuf *_mm; \ int _mhow = (how); \ int _mtype = (type); \ \ mtx_enter(&mmbfree.m_mtx, MTX_DEF); \ _MGET(_mm, _mhow); \ if (_mm != NULL) { \ mbtypes[_mtype]++; \ mtx_exit(&mmbfree.m_mtx, MTX_DEF); \ _MGET_SETUP(_mm, _mtype); \ } else \ mtx_exit(&mmbfree.m_mtx, MTX_DEF); \ (m) = _mm; \ } while (0) #define _MGETHDR_SETUP(m_set, m_set_type) do { \ (m_set)->m_type = (m_set_type); \ (m_set)->m_next = NULL; \ (m_set)->m_nextpkt = NULL; \ (m_set)->m_data = (m_set)->m_pktdat; \ (m_set)->m_flags = M_PKTHDR; \ (m_set)->m_pkthdr.rcvif = NULL; \ (m_set)->m_pkthdr.csum_flags = 0; \ (m_set)->m_pkthdr.aux = NULL; \ } while (0) #define MGETHDR(m, how, type) do { \ struct mbuf *_mm; \ int _mhow = (how); \ int _mtype = (type); \ \ mtx_enter(&mmbfree.m_mtx, MTX_DEF); \ _MGET(_mm, _mhow); \ if (_mm != NULL) { \ mbtypes[_mtype]++; \ mtx_exit(&mmbfree.m_mtx, MTX_DEF); \ _MGETHDR_SETUP(_mm, _mtype); \ } else \ mtx_exit(&mmbfree.m_mtx, MTX_DEF); \ (m) = _mm; \ } while (0) /* * mbuf external storage macros: * * MCLGET allocates and refers an mcluster to an mbuf * MEXTADD sets up pre-allocated external storage and refers to mbuf * MEXTFREE removes reference to external object and frees it if * necessary */ #define _MCLALLOC(p, how) do { \ caddr_t _mp; \ int _mhow = (how); \ \ if (mclfree.m_head == NULL) \ m_clalloc(1, _mhow); \ _mp = (caddr_t)mclfree.m_head; \ if (_mp != NULL) { \ mbstat.m_clfree--; \ mclfree.m_head = ((union mcluster *)_mp)->mcl_next; \ } else { \ if (_mhow == M_WAIT) \ _mp = m_clalloc_wait(); \ } \ (p) = _mp; \ } while (0) #define MCLGET(m, how) do { \ struct mbuf *_mm = (m); \ \ mtx_enter(&mclfree.m_mtx, MTX_DEF); \ _MCLALLOC(_mm->m_ext.ext_buf, (how)); \ mtx_exit(&mclfree.m_mtx, MTX_DEF); \ if (_mm->m_ext.ext_buf != NULL) { \ MEXT_INIT_REF(_mm, (how)); \ if (_mm->m_ext.ref_cnt == NULL) { \ _MCLFREE(_mm->m_ext.ext_buf); \ _mm->m_ext.ext_buf = NULL; \ } else { \ _mm->m_data = _mm->m_ext.ext_buf; \ _mm->m_flags |= M_EXT; \ _mm->m_ext.ext_free = NULL; \ _mm->m_ext.ext_args = NULL; \ _mm->m_ext.ext_size = MCLBYTES; \ _mm->m_ext.ext_type = EXT_CLUSTER; \ } \ } \ } while (0) #define MEXTADD(m, buf, size, free, args, flags, type) do { \ struct mbuf *_mm = (m); \ \ MEXT_INIT_REF(_mm, M_WAIT); \ if (_mm->m_ext.ref_cnt != NULL) { \ _mm->m_flags |= (M_EXT | (flags)); \ _mm->m_ext.ext_buf = (caddr_t)(buf); \ _mm->m_data = _mm->m_ext.ext_buf; \ _mm->m_ext.ext_size = (size); \ _mm->m_ext.ext_free = (free); \ _mm->m_ext.ext_args = (args); \ _mm->m_ext.ext_type = (type); \ } \ } while (0) #define _MCLFREE(p) do { \ union mcluster *_mp = (union mcluster *)(p); \ \ mtx_enter(&mclfree.m_mtx, MTX_DEF); \ _mp->mcl_next = mclfree.m_head; \ mclfree.m_head = _mp; \ mbstat.m_clfree++; \ MBWAKEUP(m_clalloc_wid); \ mtx_exit(&mclfree.m_mtx, MTX_DEF); \ } while (0) #define MEXTFREE(m) do { \ struct mbuf *_mmm = (m); \ \ if (MEXT_IS_REF(_mmm)) \ MEXT_REM_REF(_mmm); \ else if (_mmm->m_ext.ext_type != EXT_CLUSTER) { \ (*(_mmm->m_ext.ext_free))(_mmm->m_ext.ext_buf, \ _mmm->m_ext.ext_args); \ _MEXT_DEALLOC_CNT(_mmm->m_ext.ref_cnt); \ } else { \ _MCLFREE(_mmm->m_ext.ext_buf); \ _MEXT_DEALLOC_CNT(_mmm->m_ext.ref_cnt); \ } \ _mmm->m_flags &= ~M_EXT; \ } while (0) /* * MFREE(struct mbuf *m, struct mbuf *n) * Free a single mbuf and associated external storage. * Place the successor, if any, in n. */ #define MFREE(m, n) do { \ struct mbuf *_mm = (m); \ \ KASSERT(_mm->m_type != MT_FREE, ("freeing free mbuf")); \ if (_mm->m_flags & M_EXT) \ MEXTFREE(_mm); \ mtx_enter(&mmbfree.m_mtx, MTX_DEF); \ mbtypes[_mm->m_type]--; \ _mm->m_type = MT_FREE; \ mbtypes[MT_FREE]++; \ (n) = _mm->m_next; \ _mm->m_next = mmbfree.m_head; \ mmbfree.m_head = _mm; \ MBWAKEUP(m_mballoc_wid); \ mtx_exit(&mmbfree.m_mtx, MTX_DEF); \ } while (0) /* * M_WRITABLE(m) * Evaluate TRUE if it's safe to write to the mbuf m's data region (this * can be both the local data payload, or an external buffer area, * depending on whether M_EXT is set). */ #define M_WRITABLE(m) (!((m)->m_flags & M_RDONLY) && (!((m)->m_flags \ & M_EXT) || !MEXT_IS_REF(m))) /* * Copy mbuf pkthdr from "from" to "to". * from must have M_PKTHDR set, and to must be empty. * aux pointer will be moved to `to'. */ #define M_COPY_PKTHDR(to, from) do { \ struct mbuf *_mfrom = (from); \ struct mbuf *_mto = (to); \ \ _mto->m_data = _mto->m_pktdat; \ _mto->m_flags = _mfrom->m_flags & M_COPYFLAGS; \ _mto->m_pkthdr = _mfrom->m_pkthdr; \ _mfrom->m_pkthdr.aux = (struct mbuf *)NULL; \ } while (0) /* * Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place * an object of the specified size at the end of the mbuf, longword aligned. */ #define M_ALIGN(m, len) do { \ (m)->m_data += (MLEN - (len)) & ~(sizeof(long) - 1); \ } while (0) /* * As above, for mbufs allocated with m_gethdr/MGETHDR * or initialized by M_COPY_PKTHDR. */ #define MH_ALIGN(m, len) do { \ (m)->m_data += (MHLEN - (len)) & ~(sizeof(long) - 1); \ } while (0) /* * Compute the amount of space available * before the current start of data in an mbuf. */ #define M_LEADINGSPACE(m) \ ((m)->m_flags & M_EXT ? \ /* (m)->m_data - (m)->m_ext.ext_buf */ 0 : \ (m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \ (m)->m_data - (m)->m_dat) /* * Compute the amount of space available * after the end of data in an mbuf. */ #define M_TRAILINGSPACE(m) \ ((m)->m_flags & M_EXT ? (m)->m_ext.ext_buf + \ (m)->m_ext.ext_size - ((m)->m_data + (m)->m_len) : \ &(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len)) /* * Arrange to prepend space of size plen to mbuf m. * If a new mbuf must be allocated, how specifies whether to wait. * If how is M_DONTWAIT and allocation fails, the original mbuf chain * is freed and m is set to NULL. */ #define M_PREPEND(m, plen, how) do { \ struct mbuf **_mmp = &(m); \ struct mbuf *_mm = *_mmp; \ int _mplen = (plen); \ int __mhow = (how); \ \ if (M_LEADINGSPACE(_mm) >= _mplen) { \ _mm->m_data -= _mplen; \ _mm->m_len += _mplen; \ } else \ _mm = m_prepend(_mm, _mplen, __mhow); \ if (_mm != NULL && _mm->m_flags & M_PKTHDR) \ _mm->m_pkthdr.len += _mplen; \ *_mmp = _mm; \ } while (0) /* * change mbuf to new type */ #define MCHTYPE(m, t) do { \ struct mbuf *_mm = (m); \ int _mt = (t); \ \ atomic_subtract_long(&mbtypes[_mm->m_type], 1); \ atomic_add_long(&mbtypes[_mt], 1); \ _mm->m_type = (_mt); \ } while (0) /* length to m_copy to copy all */ #define M_COPYALL 1000000000 /* compatibility with 4.3 */ #define m_copy(m, o, l) m_copym((m), (o), (l), M_DONTWAIT) /* * pkthdr.aux type tags. */ struct mauxtag { int af; int type; }; #ifdef _KERNEL extern u_long m_clalloc_wid; /* mbuf cluster wait count */ extern u_long m_mballoc_wid; /* mbuf wait count */ extern int max_linkhdr; /* largest link-level header */ extern int max_protohdr; /* largest protocol header */ extern int max_hdr; /* largest link+protocol header */ extern int max_datalen; /* MHLEN - max_hdr */ extern struct mbstat mbstat; extern u_long mbtypes[MT_NTYPES]; /* per-type mbuf allocations */ extern int mbuf_wait; /* mbuf sleep time */ extern struct mbuf *mbutl; /* virtual address of mclusters */ extern struct mclfree_lst mclfree; extern struct mbffree_lst mmbfree; extern struct mcntfree_lst mcntfree; extern int nmbclusters; extern int nmbufs; extern int nsfbufs; void m_adj __P((struct mbuf *, int)); int m_alloc_ref __P((u_int, int)); void m_cat __P((struct mbuf *,struct mbuf *)); int m_clalloc __P((int, int)); caddr_t m_clalloc_wait __P((void)); void m_copyback __P((struct mbuf *, int, int, caddr_t)); void m_copydata __P((struct mbuf *,int,int,caddr_t)); struct mbuf *m_copym __P((struct mbuf *, int, int, int)); struct mbuf *m_copypacket __P((struct mbuf *, int)); struct mbuf *m_devget __P((char *, int, int, struct ifnet *, void (*copy)(char *, caddr_t, u_int))); struct mbuf *m_dup __P((struct mbuf *, int)); struct mbuf *m_free __P((struct mbuf *)); void m_freem __P((struct mbuf *)); struct mbuf *m_get __P((int, int)); struct mbuf *m_getclr __P((int, int)); struct mbuf *m_gethdr __P((int, int)); int m_mballoc __P((int, int)); struct mbuf *m_mballoc_wait __P((void)); struct mbuf *m_prepend __P((struct mbuf *,int,int)); struct mbuf *m_pulldown __P((struct mbuf *, int, int, int *)); void m_print __P((const struct mbuf *m)); struct mbuf *m_pullup __P((struct mbuf *, int)); struct mbuf *m_split __P((struct mbuf *,int,int)); struct mbuf *m_aux_add __P((struct mbuf *, int, int)); struct mbuf *m_aux_find __P((struct mbuf *, int, int)); void m_aux_delete __P((struct mbuf *, struct mbuf *)); #endif /* _KERNEL */ #endif /* !_SYS_MBUF_H_ */