| 1 | /*
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| 2 | * Copyright (c) 1982, 1986, 1988, 1993
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| 3 | * The Regents of the University of California. All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 3. All advertising materials mentioning features or use of this software
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| 14 | * must display the following acknowledgement:
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| 15 | * This product includes software developed by the University of
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| 16 | * California, Berkeley and its contributors.
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| 17 | * 4. Neither the name of the University nor the names of its contributors
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| 18 | * may be used to endorse or promote products derived from this software
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| 19 | * without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 31 | * SUCH DAMAGE.
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| 32 | *
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| 33 | * @(#)mbuf.h 8.3 (Berkeley) 1/21/94
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| 34 | * mbuf.h,v 1.9 1994/11/14 13:54:20 bde Exp
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| 35 | */
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| 36 |
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| 37 | #ifndef _MBUF_H_
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| 38 | #define _MBUF_H_
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| 39 |
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| 40 | #define m_freem m_free
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| 41 |
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| 42 |
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| 43 | #define MINCSIZE 4096 /* Amount to increase mbuf if too small */
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| 44 |
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| 45 | /*
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| 46 | * Macros for type conversion
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| 47 | * mtod(m,t) - convert mbuf pointer to data pointer of correct type
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| 48 | * dtom(x) - convert data pointer within mbuf to mbuf pointer (XXX)
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| 49 | */
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| 50 | #define mtod(m,t) ((t)(m)->m_data)
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| 51 | /* #define dtom(x) ((struct mbuf *)((int)(x) & ~(M_SIZE-1))) */
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| 52 |
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| 53 | /* XXX About mbufs for slirp:
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| 54 | * Only one mbuf is ever used in a chain, for each "cell" of data.
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| 55 | * m_nextpkt points to the next packet, if fragmented.
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| 56 | * If the data is too large, the M_EXT is used, and a larger block
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| 57 | * is alloced. Therefore, m_free[m] must check for M_EXT and if set
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| 58 | * free the m_ext. This is inefficient memory-wise, but who cares.
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| 59 | */
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| 60 |
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| 61 | /* XXX should union some of these! */
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| 62 | /* header at beginning of each mbuf: */
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| 63 | struct m_hdr {
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| 64 | struct mbuf *mh_next; /* Linked list of mbufs */
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| 65 | struct mbuf *mh_prev;
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| 66 | struct mbuf *mh_nextpkt; /* Next packet in queue/record */
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| 67 | struct mbuf *mh_prevpkt; /* Flags aren't used in the output queue */
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| 68 | int mh_flags; /* Misc flags */
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| 69 |
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| 70 | int mh_size; /* Size of data */
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| 71 | struct socket *mh_so;
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| 72 |
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| 73 | caddr_t mh_data; /* Location of data */
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| 74 | int mh_len; /* Amount of data in this mbuf */
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| 75 | };
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| 76 |
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| 77 | /*
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| 78 | * How much room is in the mbuf, from m_data to the end of the mbuf
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| 79 | */
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| 80 | #define M_ROOM(m) ((m->m_flags & M_EXT)? \
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| 81 | (((m)->m_ext + (m)->m_size) - (m)->m_data) \
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| 82 | : \
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| 83 | (((m)->m_dat + (m)->m_size) - (m)->m_data))
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| 84 |
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| 85 | /*
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| 86 | * How much free room there is
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| 87 | */
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| 88 | #define M_FREEROOM(m) (M_ROOM(m) - (m)->m_len)
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| 89 | #define M_TRAILINGSPACE M_FREEROOM
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| 90 |
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| 91 | struct mbuf {
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| 92 | struct m_hdr m_hdr;
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| 93 | union M_dat {
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| 94 | char m_dat_[1]; /* ANSI don't like 0 sized arrays */
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| 95 | char *m_ext_;
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| 96 | } M_dat;
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| 97 | };
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| 98 |
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| 99 | #define m_next m_hdr.mh_next
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| 100 | #define m_prev m_hdr.mh_prev
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| 101 | #define m_nextpkt m_hdr.mh_nextpkt
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| 102 | #define m_prevpkt m_hdr.mh_prevpkt
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| 103 | #define m_flags m_hdr.mh_flags
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| 104 | #define m_len m_hdr.mh_len
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| 105 | #define m_data m_hdr.mh_data
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| 106 | #define m_size m_hdr.mh_size
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| 107 | #define m_dat M_dat.m_dat_
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| 108 | #define m_ext M_dat.m_ext_
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| 109 | #define m_so m_hdr.mh_so
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| 110 |
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| 111 | #define ifq_prev m_prev
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| 112 | #define ifq_next m_next
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| 113 | #define ifs_prev m_prevpkt
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| 114 | #define ifs_next m_nextpkt
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| 115 | #define ifq_so m_so
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| 116 |
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| 117 | #define M_EXT 0x01 /* m_ext points to more (malloced) data */
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| 118 | #define M_FREELIST 0x02 /* mbuf is on free list */
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| 119 | #define M_USEDLIST 0x04 /* XXX mbuf is on used list (for dtom()) */
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| 120 | #define M_DOFREE 0x08 /* when m_free is called on the mbuf, free()
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| 121 | * it rather than putting it on the free list */
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| 122 |
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| 123 | /*
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| 124 | * Mbuf statistics. XXX
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| 125 | */
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| 126 |
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| 127 | struct mbstat {
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| 128 | int mbs_alloced; /* Number of mbufs allocated */
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| 129 |
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| 130 | };
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| 131 |
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| 132 | extern struct mbstat mbstat;
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| 133 | extern int mbuf_alloced;
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| 134 | extern struct mbuf m_freelist, m_usedlist;
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| 135 | extern int mbuf_max;
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| 136 |
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| 137 | void m_init _P((PNATState));
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| 138 | void msize_init _P((PNATState));
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| 139 | struct mbuf * m_get _P((PNATState));
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| 140 | void m_free _P((PNATState, struct mbuf *));
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| 141 | void m_cat _P((PNATState, register struct mbuf *, register struct mbuf *));
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| 142 | void m_inc _P((struct mbuf *, int));
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| 143 | void m_adj _P((struct mbuf *, int));
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| 144 | int m_copy _P((struct mbuf *, struct mbuf *, int, int));
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| 145 | struct mbuf * dtom _P((PNATState, void *));
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| 146 |
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| 147 | #endif
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