418 lines
13 KiB
C
418 lines
13 KiB
C
/*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)mbuf.h 8.5 (Berkeley) 2/19/95
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* $Id: mbuf.h,v 1.25 1997/10/12 20:26:00 phk Exp $
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*/
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#ifndef _SYS_MBUF_H_
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#define _SYS_MBUF_H_
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/*
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* Mbufs are of a single size, MSIZE (machine/machparam.h), which
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* includes overhead. An mbuf may add a single "mbuf cluster" of size
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* MCLBYTES (also in machine/machparam.h), which has no additional overhead
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* and is used instead of the internal data area; this is done when
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* at least MINCLSIZE of data must be stored.
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*/
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#define MLEN (MSIZE - sizeof(struct m_hdr)) /* normal data len */
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#define MHLEN (MLEN - sizeof(struct pkthdr)) /* data len w/pkthdr */
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#define MINCLSIZE (MHLEN + MLEN) /* smallest amount to put in cluster */
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#define M_MAXCOMPRESS (MHLEN / 2) /* max amount to copy for compression */
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/*
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* Macros for type conversion
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* mtod(m,t) - convert mbuf pointer to data pointer of correct type
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* dtom(x) - convert data pointer within mbuf to mbuf pointer (XXX)
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* mtocl(x) - convert pointer within cluster to cluster index #
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* cltom(x) - convert cluster # to ptr to beginning of cluster
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*/
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#define mtod(m,t) ((t)((m)->m_data))
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#define dtom(x) ((struct mbuf *)((long)(x) & ~(MSIZE-1)))
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#define mtocl(x) (((u_long)(x) - (u_long)mbutl) >> MCLSHIFT)
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#define cltom(x) ((caddr_t)((u_long)mbutl + ((u_long)(x) << MCLSHIFT)))
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/* header at beginning of each mbuf: */
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struct m_hdr {
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struct mbuf *mh_next; /* next buffer in chain */
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struct mbuf *mh_nextpkt; /* next chain in queue/record */
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caddr_t mh_data; /* location of data */
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int mh_len; /* amount of data in this mbuf */
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short mh_type; /* type of data in this mbuf */
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short mh_flags; /* flags; see below */
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};
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/* record/packet header in first mbuf of chain; valid if M_PKTHDR set */
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struct pkthdr {
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struct ifnet *rcvif; /* rcv interface */
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int len; /* total packet length */
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};
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/* description of external storage mapped into mbuf, valid if M_EXT set */
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struct m_ext {
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caddr_t ext_buf; /* start of buffer */
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void (*ext_free) /* free routine if not the usual */
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__P((caddr_t, u_int));
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u_int ext_size; /* size of buffer, for ext_free */
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void (*ext_ref) /* add a reference to the ext object */
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__P((caddr_t, u_int));
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};
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struct mbuf {
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struct m_hdr m_hdr;
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union {
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struct {
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struct pkthdr MH_pkthdr; /* M_PKTHDR set */
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union {
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struct m_ext MH_ext; /* M_EXT set */
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char MH_databuf[MHLEN];
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} MH_dat;
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} MH;
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char M_databuf[MLEN]; /* !M_PKTHDR, !M_EXT */
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} M_dat;
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};
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#define m_next m_hdr.mh_next
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#define m_len m_hdr.mh_len
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#define m_data m_hdr.mh_data
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#define m_type m_hdr.mh_type
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#define m_flags m_hdr.mh_flags
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#define m_nextpkt m_hdr.mh_nextpkt
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#define m_act m_nextpkt
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#define m_pkthdr M_dat.MH.MH_pkthdr
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#define m_ext M_dat.MH.MH_dat.MH_ext
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#define m_pktdat M_dat.MH.MH_dat.MH_databuf
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#define m_dat M_dat.M_databuf
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/* mbuf flags */
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#define M_EXT 0x0001 /* has associated external storage */
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#define M_PKTHDR 0x0002 /* start of record */
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#define M_EOR 0x0004 /* end of record */
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#define M_PROTO1 0x0008 /* protocol-specific */
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/* mbuf pkthdr flags, also in m_flags */
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#define M_BCAST 0x0100 /* send/received as link-level broadcast */
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#define M_MCAST 0x0200 /* send/received as link-level multicast */
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/* flags copied when copying m_pkthdr */
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#define M_COPYFLAGS (M_PKTHDR|M_EOR|M_PROTO1|M_BCAST|M_MCAST)
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/* mbuf types */
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#define MT_FREE 0 /* should be on free list */
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#define MT_DATA 1 /* dynamic (data) allocation */
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#define MT_HEADER 2 /* packet header */
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/*efine MT_SOCKET 3*/ /* socket structure */
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/*efine MT_PCB 4*/ /* protocol control block */
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#define MT_RTABLE 5 /* routing tables */
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/*efine MT_HTABLE 6*/ /* IMP host tables */
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/*efine MT_ATABLE 7*/ /* address resolution tables */
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#define MT_SONAME 8 /* socket name */
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#define MT_SOOPTS 10 /* socket options */
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#define MT_FTABLE 11 /* fragment reassembly header */
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/*efine MT_RIGHTS 12*/ /* access rights */
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/*efine MT_IFADDR 13*/ /* interface address */
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#define MT_CONTROL 14 /* extra-data protocol message */
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#define MT_OOBDATA 15 /* expedited data */
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/* flags to m_get/MGET */
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#define M_DONTWAIT 1
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#define M_WAIT 0
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/* Freelists:
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*
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* Normal mbuf clusters are normally treated as character arrays
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* after allocation, but use the first word of the buffer as a free list
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* pointer while on the free list.
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*/
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union mcluster {
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union mcluster *mcl_next;
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char mcl_buf[MCLBYTES];
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};
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/*
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* mbuf utility macros:
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*
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* MBUFLOCK(code)
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* prevents a section of code from from being interrupted by network
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* drivers.
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*/
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#define MBUFLOCK(code) \
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{ int ms = splimp(); \
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{ code } \
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splx(ms); \
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}
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/*
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* mbuf allocation/deallocation macros:
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*
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* MGET(struct mbuf *m, int how, int type)
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* allocates an mbuf and initializes it to contain internal data.
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*
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* MGETHDR(struct mbuf *m, int how, int type)
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* allocates an mbuf and initializes it to contain a packet header
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* and internal data.
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*/
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#define MGET(m, how, type) { \
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int _ms = splimp(); \
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if (mmbfree == 0) \
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(void)m_mballoc(1, (how)); \
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if (((m) = mmbfree) != 0) { \
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mmbfree = (m)->m_next; \
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mbstat.m_mtypes[MT_FREE]--; \
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(m)->m_type = (type); \
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mbstat.m_mtypes[type]++; \
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(m)->m_next = (struct mbuf *)NULL; \
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(m)->m_nextpkt = (struct mbuf *)NULL; \
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(m)->m_data = (m)->m_dat; \
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(m)->m_flags = 0; \
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splx(_ms); \
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} else { \
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splx(_ms); \
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(m) = m_retry((how), (type)); \
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} \
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}
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#define MGETHDR(m, how, type) { \
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int _ms = splimp(); \
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if (mmbfree == 0) \
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(void)m_mballoc(1, (how)); \
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if (((m) = mmbfree) != 0) { \
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mmbfree = (m)->m_next; \
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mbstat.m_mtypes[MT_FREE]--; \
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(m)->m_type = (type); \
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mbstat.m_mtypes[type]++; \
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(m)->m_next = (struct mbuf *)NULL; \
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(m)->m_nextpkt = (struct mbuf *)NULL; \
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(m)->m_data = (m)->m_pktdat; \
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(m)->m_flags = M_PKTHDR; \
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splx(_ms); \
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} else { \
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splx(_ms); \
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(m) = m_retryhdr((how), (type)); \
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} \
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}
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/*
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* Mbuf cluster macros.
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* MCLALLOC(caddr_t p, int how) allocates an mbuf cluster.
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* MCLGET adds such clusters to a normal mbuf;
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* the flag M_EXT is set upon success.
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* MCLFREE releases a reference to a cluster allocated by MCLALLOC,
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* freeing the cluster if the reference count has reached 0.
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*/
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#define MCLALLOC(p, how) \
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MBUFLOCK( \
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if (mclfree == 0) \
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(void)m_clalloc(1, (how)); \
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if (((p) = (caddr_t)mclfree) != 0) { \
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++mclrefcnt[mtocl(p)]; \
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mbstat.m_clfree--; \
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mclfree = ((union mcluster *)(p))->mcl_next; \
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} \
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)
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#define MCLGET(m, how) \
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{ MCLALLOC((m)->m_ext.ext_buf, (how)); \
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if ((m)->m_ext.ext_buf != NULL) { \
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(m)->m_data = (m)->m_ext.ext_buf; \
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(m)->m_flags |= M_EXT; \
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(m)->m_ext.ext_free = NULL; \
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(m)->m_ext.ext_ref = NULL; \
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(m)->m_ext.ext_size = MCLBYTES; \
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} \
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}
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#define MCLFREE(p) \
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MBUFLOCK ( \
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if (--mclrefcnt[mtocl(p)] == 0) { \
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((union mcluster *)(p))->mcl_next = mclfree; \
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mclfree = (union mcluster *)(p); \
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mbstat.m_clfree++; \
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} \
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)
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/*
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* MFREE(struct mbuf *m, struct mbuf *n)
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* Free a single mbuf and associated external storage.
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* Place the successor, if any, in n.
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*/
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#define MFREE(m, n) \
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MBUFLOCK( \
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mbstat.m_mtypes[(m)->m_type]--; \
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if ((m)->m_flags & M_EXT) { \
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if ((m)->m_ext.ext_free) \
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(*((m)->m_ext.ext_free))((m)->m_ext.ext_buf, \
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(m)->m_ext.ext_size); \
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else { \
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char *p = (m)->m_ext.ext_buf; \
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if (--mclrefcnt[mtocl(p)] == 0) { \
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((union mcluster *)(p))->mcl_next = mclfree; \
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mclfree = (union mcluster *)(p); \
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mbstat.m_clfree++; \
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} \
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} \
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} \
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(n) = (m)->m_next; \
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(m)->m_type = MT_FREE; \
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mbstat.m_mtypes[MT_FREE]++; \
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(m)->m_next = mmbfree; \
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mmbfree = (m); \
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)
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/*
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* Copy mbuf pkthdr from from to to.
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* from must have M_PKTHDR set, and to must be empty.
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*/
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#define M_COPY_PKTHDR(to, from) { \
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(to)->m_pkthdr = (from)->m_pkthdr; \
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(to)->m_flags = (from)->m_flags & M_COPYFLAGS; \
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(to)->m_data = (to)->m_pktdat; \
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}
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/*
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* Set the m_data pointer of a newly-allocated mbuf (m_get/MGET) to place
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* an object of the specified size at the end of the mbuf, longword aligned.
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*/
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#define M_ALIGN(m, len) \
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{ (m)->m_data += (MLEN - (len)) &~ (sizeof(long) - 1); }
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/*
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* As above, for mbufs allocated with m_gethdr/MGETHDR
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* or initialized by M_COPY_PKTHDR.
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*/
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#define MH_ALIGN(m, len) \
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{ (m)->m_data += (MHLEN - (len)) &~ (sizeof(long) - 1); }
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/*
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* Compute the amount of space available
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* before the current start of data in an mbuf.
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*/
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#define M_LEADINGSPACE(m) \
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((m)->m_flags & M_EXT ? /* (m)->m_data - (m)->m_ext.ext_buf */ 0 : \
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(m)->m_flags & M_PKTHDR ? (m)->m_data - (m)->m_pktdat : \
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(m)->m_data - (m)->m_dat)
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/*
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* Compute the amount of space available
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* after the end of data in an mbuf.
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*/
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#define M_TRAILINGSPACE(m) \
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((m)->m_flags & M_EXT ? (m)->m_ext.ext_buf + (m)->m_ext.ext_size - \
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((m)->m_data + (m)->m_len) : \
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&(m)->m_dat[MLEN] - ((m)->m_data + (m)->m_len))
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/*
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* Arrange to prepend space of size plen to mbuf m.
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* If a new mbuf must be allocated, how specifies whether to wait.
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* If how is M_DONTWAIT and allocation fails, the original mbuf chain
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* is freed and m is set to NULL.
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*/
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#define M_PREPEND(m, plen, how) { \
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if (M_LEADINGSPACE(m) >= (plen)) { \
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(m)->m_data -= (plen); \
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(m)->m_len += (plen); \
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} else \
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(m) = m_prepend((m), (plen), (how)); \
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if ((m) && (m)->m_flags & M_PKTHDR) \
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(m)->m_pkthdr.len += (plen); \
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}
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/* change mbuf to new type */
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#define MCHTYPE(m, t) { \
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MBUFLOCK(mbstat.m_mtypes[(m)->m_type]--; mbstat.m_mtypes[t]++;) \
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(m)->m_type = t;\
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}
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/* length to m_copy to copy all */
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#define M_COPYALL 1000000000
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/* compatibility with 4.3 */
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#define m_copy(m, o, l) m_copym((m), (o), (l), M_DONTWAIT)
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/*
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* Mbuf statistics.
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*/
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struct mbstat {
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u_long m_mbufs; /* mbufs obtained from page pool */
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u_long m_clusters; /* clusters obtained from page pool */
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u_long m_spare; /* spare field */
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u_long m_clfree; /* free clusters */
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u_long m_drops; /* times failed to find space */
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u_long m_wait; /* times waited for space */
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u_long m_drain; /* times drained protocols for space */
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u_short m_mtypes[256]; /* type specific mbuf allocations */
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u_long m_mcfail; /* times m_copym failed */
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u_long m_mpfail; /* times m_pullup failed */
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u_long m_msize; /* length of an mbuf */
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u_long m_mclbytes; /* length of an mbuf cluster */
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u_long m_minclsize; /* min length of data to allocate a cluster */
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u_long m_mlen; /* length of data in an mbuf */
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u_long m_mhlen; /* length of data in a header mbuf */
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};
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#ifdef KERNEL
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extern struct mbuf *mbutl; /* virtual address of mclusters */
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extern char *mclrefcnt; /* cluster reference counts */
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extern struct mbstat mbstat;
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extern int nmbclusters;
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extern int nmbufs;
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extern struct mbuf *mmbfree;
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extern union mcluster *mclfree;
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extern int max_linkhdr; /* largest link-level header */
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extern int max_protohdr; /* largest protocol header */
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extern int max_hdr; /* largest link+protocol header */
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extern int max_datalen; /* MHLEN - max_hdr */
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struct mbuf *m_copym __P((struct mbuf *, int, int, int));
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struct mbuf *m_copypacket __P((struct mbuf *, int));
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struct mbuf *m_devget __P((char *, int, int, struct ifnet *,
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void (*copy)(char *, caddr_t, u_int)));
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struct mbuf *m_free __P((struct mbuf *));
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struct mbuf *m_get __P((int, int));
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struct mbuf *m_getclr __P((int, int));
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struct mbuf *m_gethdr __P((int, int));
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struct mbuf *m_prepend __P((struct mbuf *,int,int));
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struct mbuf *m_pullup __P((struct mbuf *, int));
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struct mbuf *m_retry __P((int, int));
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struct mbuf *m_retryhdr __P((int, int));
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struct mbuf *m_split __P((struct mbuf *,int,int));
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void m_adj __P((struct mbuf *, int));
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void m_cat __P((struct mbuf *,struct mbuf *));
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int m_mballoc __P((int, int));
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int m_clalloc __P((int, int));
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void m_copyback __P((struct mbuf *, int, int, caddr_t));
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void m_copydata __P((struct mbuf *,int,int,caddr_t));
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void m_freem __P((struct mbuf *));
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#endif /* KERNEL */
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#endif /* !_SYS_MBUF_H_ */
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