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