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/*

 * 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

 * $Id: mbuf.h,v 1.2 2001-09-27 12:02:00 chris Exp $

 */

#ifndef _SYS_MBUF_H_

#define _SYS_MBUF_H_

#ifndef M_WAITOK

#include <sys/malloc.h>

#endif

/*

 * Mbufs are of a single size, MSIZE (machine/machparam.h), which

 * includes overhead.  An mbuf may add a single "mbuf cluster" of size

 * MCLBYTES (also in machine/machparam.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 + MLEN)  /* 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 *)((long)(x) & ~(MSIZE-1)))

#define mtocl(x)        (((u_long)(x) - (u_long)mbutl) >> MCLSHIFT)

#define cltom(x)        ((caddr_t)((u_long)mbutl + ((u_long)(x) << MCLSHIFT)))

/* 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 */

};

/* 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 */

/* 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 */

/* flags copied when copying m_pkthdr */

#define M_COPYFLAGS     (M_PKTHDR|M_EOR|M_PROTO1|M_BCAST|M_MCAST)

/* mbuf types */

#define MT_FREE         0        /* should be on free list */

#define MT_DATA         1       /* dynamic (data) allocation */

#define MT_HEADER       2       /* packet header */

#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 */

#define MT_SONAME       8       /* socket name */

#define MT_SOOPTS       10      /* socket options */

#define MT_FTABLE       11      /* fragment reassembly header */

#define MT_RIGHTS       12      /* access rights */

#define MT_IFADDR       13      /* interface address */

#define MT_CONTROL      14      /* extra-data protocol message */

#define MT_OOBDATA      15      /* expedited data  */

/* flags to m_get/MGET */

#define M_DONTWAIT      M_NOWAIT

#define M_WAIT          M_WAITOK

/* 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];

};

/*

 * mbuf utility macros:

 *

 *      MBUFLOCK(code)

 * prevents a section of code from from being interrupted by network

 * drivers.

 */

#define MBUFLOCK(code) \

        { int ms = splimp(); \

          { code } \

          splx(ms); \

        }

/*

 * 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) { \

          int _ms = splimp(); \

          if (mmbfree == 0) \

                (void)m_mballoc(1, (how)); \

          if (((m) = mmbfree) != 0) { \

                mmbfree = (m)->m_next; \

                mbstat.m_mtypes[MT_FREE]--; \

                (m)->m_type = (type); \

                mbstat.m_mtypes[type]++; \

                (m)->m_next = (struct mbuf *)NULL; \

                (m)->m_nextpkt = (struct mbuf *)NULL; \

                (m)->m_data = (m)->m_dat; \

                (m)->m_flags = 0; \

                splx(_ms); \

        } else { \

                splx(_ms); \

                (m) = m_retry((how), (type)); \

        } \

}

#define MGETHDR(m, how, type) { \

          int _ms = splimp(); \

          if (mmbfree == 0) \

                (void)m_mballoc(1, (how)); \

          if (((m) = mmbfree) != 0) { \

                mmbfree = (m)->m_next; \

                mbstat.m_mtypes[MT_FREE]--; \

                (m)->m_type = (type); \

                mbstat.m_mtypes[type]++; \

                (m)->m_next = (struct mbuf *)NULL; \

                (m)->m_nextpkt = (struct mbuf *)NULL; \

                (m)->m_data = (m)->m_pktdat; \

                (m)->m_flags = M_PKTHDR; \

                splx(_ms); \

        } else { \

                splx(_ms); \

                (m) = m_retryhdr((how), (type)); \

        } \

}

/*

 * 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) \

        MBUFLOCK( \

          if (mclfree == 0) \

                (void)m_clalloc(1, (how)); \

          if (((p) = (caddr_t)mclfree) != 0) { \

                ++mclrefcnt[mtocl(p)]; \

                mbstat.m_clfree--; \

                mclfree = ((union mcluster *)(p))->mcl_next; \

          } \

        )

#define MCLGET(m, how) \

        { MCLALLOC((m)->m_ext.ext_buf, (how)); \

          if ((m)->m_ext.ext_buf != NULL) { \

                (m)->m_data = (m)->m_ext.ext_buf; \

                (m)->m_flags |= M_EXT; \

                (m)->m_ext.ext_free = NULL;  \

                (m)->m_ext.ext_ref = NULL;  \

                (m)->m_ext.ext_size = MCLBYTES;  \

          } \

        }

#define MCLFREE(p) \

        MBUFLOCK ( \

          if (--mclrefcnt[mtocl(p)] == 0) { \

                ((union mcluster *)(p))->mcl_next = mclfree; \

                mclfree = (union mcluster *)(p); \

                mbstat.m_clfree++; \

          } \

        )

/*

 * 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) \

        MBUFLOCK(  \

          mbstat.m_mtypes[(m)->m_type]--; \

          if ((m)->m_flags & M_EXT) { \

                if ((m)->m_ext.ext_free) \

                        (*((m)->m_ext.ext_free))((m)->m_ext.ext_buf, \

                            (m)->m_ext.ext_size); \

                else { \

                        char *p = (m)->m_ext.ext_buf; \

                        if (--mclrefcnt[mtocl(p)] == 0) { \

                                ((union mcluster *)(p))->mcl_next = mclfree; \

                                mclfree = (union mcluster *)(p); \

                                mbstat.m_clfree++; \

                        } \

                } \

          } \

          (n) = (m)->m_next; \

          (m)->m_type = MT_FREE; \

          mbstat.m_mtypes[MT_FREE]++; \

          (m)->m_next = mmbfree; \

          mmbfree = (m); \

        )

/*

 * Copy mbuf pkthdr from from to to.

 * from must have M_PKTHDR set, and to must be empty.

 */

#define M_COPY_PKTHDR(to, from) { \

        (to)->m_pkthdr = (from)->m_pkthdr; \

        (to)->m_flags = (from)->m_flags & M_COPYFLAGS; \

        (to)->m_data = (to)->m_pktdat; \

}

/*

 * 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) \

        { (m)->m_data += (MLEN - (len)) &~ (sizeof(long) - 1); }

/*

 * As above, for mbufs allocated with m_gethdr/MGETHDR

 * or initialized by M_COPY_PKTHDR.

 */

#define MH_ALIGN(m, len) \

        { (m)->m_data += (MHLEN - (len)) &~ (sizeof(long) - 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) { \

        if (M_LEADINGSPACE(m) >= (plen)) { \

                (m)->m_data -= (plen); \

                (m)->m_len += (plen); \

        } else \

                (m) = m_prepend((m), (plen), (how)); \

        if ((m) && (m)->m_flags & M_PKTHDR) \

                (m)->m_pkthdr.len += (plen); \

}

/* change mbuf to new type */

#define MCHTYPE(m, t) { \

        MBUFLOCK(mbstat.m_mtypes[(m)->m_type]--; mbstat.m_mtypes[t]++;) \

        (m)->m_type = t;\

}

/* 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)

/*

 * 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_short m_mtypes[256];  /* type specific mbuf allocations */

};

#ifdef  KERNEL

extern struct mbuf *mbutl;              /* virtual address of mclusters */

extern char     *mclrefcnt;             /* cluster reference counts */

extern struct mbstat mbstat;

extern int      nmbclusters;

extern int      nmbufs;

extern struct mbuf *mmbfree;

extern union mcluster *mclfree;

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 int      mbtypes[];              /* XXX */

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_free __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_prepend __P((struct mbuf *,int,int));

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));

void    m_adj __P((struct mbuf *, int));

void    m_cat __P((struct mbuf *,struct mbuf *));

int     m_mballoc __P((int, int));

int     m_clalloc __P((int, int));

void    m_copyback __P((struct mbuf *, int, int, caddr_t));

void    m_copydata __P((struct mbuf *,int,int,caddr_t));

void    m_freem __P((struct mbuf *));

void    m_reclaim __P((void));

#ifdef MBTYPES

int mbtypes[] = {                               /* XXX */

        M_FREE,         /* MT_FREE      0           should be on free list */

        M_MBUF,         /* MT_DATA      1          dynamic (data) allocation */

        M_MBUF,         /* MT_HEADER    2          packet header */

        M_SOCKET,       /* MT_SOCKET    3          socket structure */

        M_PCB,          /* MT_PCB       4          protocol control block */

        M_RTABLE,       /* MT_RTABLE    5          routing tables */

        M_HTABLE,       /* MT_HTABLE    6          IMP host tables */

        0,               /* MT_ATABLE    7          address resolution tables */

        M_MBUF,         /* MT_SONAME    8          socket name */

        0,               /*              9 */

        M_SOOPTS,       /* MT_SOOPTS    10         socket options */

        M_FTABLE,       /* MT_FTABLE    11         fragment reassembly header */

        M_MBUF,         /* MT_RIGHTS    12         access rights */

        M_IFADDR,       /* MT_IFADDR    13         interface address */

        M_MBUF,         /* MT_CONTROL   14         extra-data protocol message */

        M_MBUF,         /* MT_OOBDATA   15         expedited data  */

#ifdef DATAKIT

        25, 26, 27, 28, 29, 30, 31, 32          /* datakit ugliness */

#endif

};

#endif

#endif

#endif /* !_SYS_MBUF_H_ */