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//========================================================================== // // include/sys/mbuf.h // //========================================================================== //####BSDCOPYRIGHTBEGIN#### // // ------------------------------------------- // // Portions of this software may have been derived from OpenBSD, // FreeBSD or other sources, and are covered by the appropriate // copyright disclaimers included herein. // // Portions created by Red Hat are // Copyright (C) 2002 Red Hat, Inc. All Rights Reserved. // // ------------------------------------------- // //####BSDCOPYRIGHTEND#### //========================================================================== /* * 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: src/sys/sys/mbuf.h,v 1.44.2.10 2001/07/03 11:02:01 ume Exp $ */ #ifndef _SYS_MBUF_H_ #define _SYS_MBUF_H_ /* * 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 */ /* * 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) * mtocl(x) - convert pointer within cluster to cluster index # * cltom(x) - convert cluster # to ptr to beginning of cluster */ #define mtod(m, t) ((t)((m)->m_data)) #define dtom(x) ((struct mbuf *)((CYG_ADDRESS)(x) & ~(MSIZE-1))) extern int cyg_mtocl(u_long); extern struct mbuf *cyg_cltom(u_long); #define mtocl(x) cyg_mtocl((u_long)x) #define cltom(x) cyg_cltom((u_long)x) /* 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, u_int)); u_int ext_size; /* size of buffer, for ext_free */ void (*ext_ref) /* add a reference to the ext object */ __P((caddr_t, u_int)); }; 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_PROTO1 0x0008 /* protocol-specific */ #define M_PROTO2 0x0010 /* protocol-specific */ #define M_PROTO3 0x0020 /* protocol-specific */ #define M_PROTO4 0x0040 /* protocol-specific */ #define M_PROTO5 0x0080 /* protocol-specific */ #define M_PROTO6 0x2000 /* protocol-specific */ /* mbuf pkthdr flags, also in m_flags */ #define M_BCAST 0x0100 /* send/received as link-level broadcast */ #define M_MCAST 0x0200 /* send/received as link-level multicast */ #define M_FRAG 0x0400 /* packet is a fragment of a larger packet */ #define M_FIRSTFRAG 0x0800 /* packet is first fragment */ #define M_LASTFRAG 0x1000 /* packet is last fragment */ #define M_AUX 0x4000 /* mbufs pointed to by m->m_pkthdr.aux */ /* 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_PROTO6|M_BCAST|M_MCAST|M_FRAG| \ M_AUX) /* 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_spare; /* spare field */ u_long m_clfree; /* free clusters */ 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 */ u_quad_t m_exthdrget; /* # of calls to IP6_EXTHDR_GET */ u_quad_t m_exthdrget0; /* # of calls to IP6_EXTHDR_GET0 */ u_quad_t m_pulldowns; /* # of calls to m_pulldown */ u_quad_t m_pulldown_copy; /* # of mbuf copies in m_pulldown */ u_quad_t m_pulldown_alloc; /* # of mbuf allocs in m_pulldown */ u_quad_t m_pullups; /* # of calls to m_pullup */ u_quad_t m_pullup_copy; /* # of possible m_pullup copies */ u_quad_t m_pullup_alloc; /* # of possible m_pullup mallocs */ u_quad_t m_pullup_fail; /* # of possible m_pullup failures */ u_quad_t m_pullup2; /* # of calls to m_pullup2 */ u_quad_t m_pullup2_copy; /* # of possible m_pullup2 copies */ u_quad_t m_pullup2_alloc; /* # of possible m_pullup2 mallocs */ u_quad_t m_pullup2_fail; /* # of possible m_pullup2 failures */ }; /* flags to m_get/MGET */ #define M_DONTWAIT 1 #define M_WAIT 0 /* Freelists: * * 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]; }; /* * These are identifying numbers passed to the m_mballoc_wait function, * allowing us to determine whether the call came from an MGETHDR or * an MGET. */ #define MGETHDR_C 1 #define MGET_C 2 /* * Wake up the next instance (if any) of m_mballoc_wait() which is * waiting for an mbuf to be freed. This should be called at splimp(). * * XXX: If there is another free mbuf, this routine will be called [again] * from the m_mballoc_wait routine in order to wake another sleep instance. */ #define MMBWAKEUP() do { \ if (m_mballoc_wid) { \ m_mballoc_wid--; \ wakeup_one(&m_mballoc_wid); \ } \ } while (0) /* * Same as above, but for mbuf cluster(s). */ #define MCLWAKEUP() do { \ if (m_clalloc_wid) { \ m_clalloc_wid--; \ wakeup_one(&m_clalloc_wid); \ } \ } while (0) /* * mbuf utility macros: * * MBUFLOCK(code) * prevents a section of code from from being interrupted by network * drivers. */ #define MBUFLOCK(code) do { \ int _ms = splimp(); \ \ { code } \ splx(_ms); \ } 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. */ #define MGET(m, how, type) do { \ struct mbuf *_mm; \ int _mhow = (how); \ int _mtype = (type); \ int _ms = splimp(); \ \ if (mmbfree == NULL) \ (void)m_mballoc(1, _mhow); \ _mm = mmbfree; \ if (_mm != NULL) { \ mmbfree = _mm->m_next; \ mbtypes[MT_FREE]--; \ _mm->m_type = _mtype; \ mbtypes[_mtype]++; \ _mm->m_next = NULL; \ _mm->m_nextpkt = NULL; \ _mm->m_data = _mm->m_dat; \ _mm->m_flags = 0; \ (m) = _mm; \ splx(_ms); \ } else { \ splx(_ms); \ _mm = m_retry(_mhow, _mtype); \ if (_mm == NULL && _mhow == M_WAIT) \ (m) = m_mballoc_wait(MGET_C, _mtype); \ else \ (m) = _mm; \ } \ } while (0) #define MGETHDR(m, how, type) do { \ struct mbuf *_mm; \ int _mhow = (how); \ int _mtype = (type); \ int _ms = splimp(); \ \ if (mmbfree == NULL) \ (void)m_mballoc(1, _mhow); \ _mm = mmbfree; \ if (_mm != NULL) { \ mmbfree = _mm->m_next; \ mbtypes[MT_FREE]--; \ _mm->m_type = _mtype; \ mbtypes[_mtype]++; \ _mm->m_next = NULL; \ _mm->m_nextpkt = NULL; \ _mm->m_data = _mm->m_pktdat; \ _mm->m_flags = M_PKTHDR; \ bzero(&(_mm)->m_pkthdr, sizeof((_mm)->m_pkthdr)); \ (m) = _mm; \ splx(_ms); \ } else { \ splx(_ms); \ _mm = m_retryhdr(_mhow, _mtype); \ if (_mm == NULL && _mhow == M_WAIT) \ (m) = m_mballoc_wait(MGETHDR_C, _mtype); \ else \ (m) = _mm; \ } \ } while (0) /* * Mbuf cluster macros. * MCLALLOC(caddr_t p, int how) allocates an mbuf cluster. * MCLGET adds such clusters to a normal mbuf; * the flag M_EXT is set upon success. * MCLFREE releases a reference to a cluster allocated by MCLALLOC, * freeing the cluster if the reference count has reached 0. */ #define MCLALLOC(p, how) do { \ caddr_t _mp; \ int _mhow = (how); \ int _ms = splimp(); \ \ if (mclfree == NULL) \ (void)m_clalloc(1, _mhow); \ _mp = (caddr_t)mclfree; \ if (_mp != NULL) { \ mclrefcnt[mtocl(_mp)]++; \ mbstat.m_clfree--; \ mclfree = ((union mcluster *)_mp)->mcl_next; \ (p) = _mp; \ splx(_ms); \ } else { \ splx(_ms); \ if (_mhow == M_WAIT) \ (p) = m_clalloc_wait(); \ else \ (p) = NULL; \ } \ } while (0) #define MCLGET(m, how) do { \ struct mbuf *_mm = (m); \ \ MCLALLOC(_mm->m_ext.ext_buf, (how)); \ if (_mm->m_ext.ext_buf != NULL) { \ _mm->m_data = _mm->m_ext.ext_buf; \ _mm->m_flags |= M_EXT; \ _mm->m_ext.ext_free = NULL; \ _mm->m_ext.ext_ref = NULL; \ _mm->m_ext.ext_size = MCLBYTES; \ } \ } while (0) #define MCLFREE1(p) do { \ union mcluster *_mp = (union mcluster *)(p); \ \ /* KASSERT(mclrefcnt[mtocl(_mp)] > 0, ("freeing free cluster")); */ \ if (--mclrefcnt[mtocl(_mp)] == 0) { \ _mp->mcl_next = mclfree; \ mclfree = _mp; \ mbstat.m_clfree++; \ MCLWAKEUP(); \ } \ } while (0) #define MCLFREE(p) MBUFLOCK( \ MCLFREE1(p); \ ) #define MEXTFREE1(m) do { \ struct mbuf *_mm = (m); \ \ if (_mm->m_ext.ext_free != NULL) \ (*_mm->m_ext.ext_free)(_mm->m_ext.ext_buf, \ _mm->m_ext.ext_size); \ else \ MCLFREE1(_mm->m_ext.ext_buf); \ } while (0) #define MEXTFREE(m) MBUFLOCK( \ MEXTFREE1(m); \ ) /* * MFREE(struct mbuf *m, struct mbuf *n) * Free a single mbuf and associated external storage. * Place the successor, if any, in n. * * we do need to check non-first mbuf for m_aux, since some of existing * code does not call M_PREPEND properly. * (example: call to bpf_mtap from drivers) */ #define MFREE(m, n) MBUFLOCK( \ struct mbuf *_mm = (m); \ \ /* KASSERT(_mm->m_type != MT_FREE, ("freeing free mbuf")); */ \ mbtypes[_mm->m_type]--; \ if ((_mm->m_flags & M_PKTHDR) != 0 && _mm->m_pkthdr.aux) { \ m_freem(_mm->m_pkthdr.aux); \ _mm->m_pkthdr.aux = NULL; \ } \ if (_mm->m_flags & M_EXT) \ MEXTFREE1(m); \ (n) = _mm->m_next; \ _mm->m_type = MT_FREE; \ mbtypes[MT_FREE]++; \ _mm->m_next = mmbfree; \ mmbfree = _mm; \ MMBWAKEUP(); \ ) /* * 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) /* * Check if we can write to an mbuf. */ #define M_WRITABLE(m) (!((m)->m_flags & M_EXT) || \ ((m)->m_ext.ext_free == NULL && mclrefcnt[mtocl((m)->m_ext.ext_buf)] == 1)) /* * 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); \ int _ms = splimp(); \ \ mbtypes[_mm->m_type]--; \ mbtypes[_mt]++; \ splx(_ms); \ _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; void* p; }; #ifdef _KERNEL extern u_int m_clalloc_wid; /* mbuf cluster wait count */ extern u_int 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 char *mclrefcnt; /* cluster reference counts */ extern union mcluster *mclfree; extern struct mbuf *mmbfree; extern int nmbclusters; extern int nmbufs; extern int nsfbufs; void m_adj __P((struct mbuf *, 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)); struct mbuf *m_getm __P((struct mbuf *, int, int, int)); int m_mballoc __P((int, int)); struct mbuf *m_mballoc_wait __P((int, int)); 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_retry __P((int, int)); struct mbuf *m_retryhdr __P((int, int)); struct mbuf *m_split __P((struct mbuf *,int,int)); struct mbuf *m_aux_add2 __P((struct mbuf *, int, int, void *)); struct mbuf *m_aux_find2 __P((struct mbuf *, int, int, void *)); 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 *)); extern void *cyg_net_mbuf_alloc(int type, int flags); extern void cyg_net_mbuf_free(caddr_t addr, int type); extern void *cyg_net_cluster_alloc(void ); #endif /* _KERNEL */ #endif /* !_SYS_MBUF_H_ */
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