128 lines
4.3 KiB
C
128 lines
4.3 KiB
C
/*
|
|
* 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. 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 8.3 (Berkeley) 1/21/94
|
|
* mbuf.h,v 1.9 1994/11/14 13:54:20 bde Exp
|
|
*/
|
|
|
|
#ifndef _MBUF_H_
|
|
#define _MBUF_H_
|
|
|
|
#define m_freem m_free
|
|
|
|
|
|
#define MINCSIZE 4096 /* Amount to increase mbuf if too small */
|
|
|
|
/*
|
|
* Macros for type conversion
|
|
* mtod(m,t) - convert mbuf pointer to data pointer of correct type
|
|
*/
|
|
#define mtod(m,t) ((t)(m)->m_data)
|
|
|
|
/* XXX About mbufs for slirp:
|
|
* Only one mbuf is ever used in a chain, for each "cell" of data.
|
|
* m_nextpkt points to the next packet, if fragmented.
|
|
* If the data is too large, the M_EXT is used, and a larger block
|
|
* is alloced. Therefore, m_free[m] must check for M_EXT and if set
|
|
* free the m_ext. This is inefficient memory-wise, but who cares.
|
|
*/
|
|
|
|
/* XXX should union some of these! */
|
|
/* header at beginning of each mbuf: */
|
|
struct m_hdr {
|
|
struct mbuf *mh_next; /* Linked list of mbufs */
|
|
struct mbuf *mh_prev;
|
|
struct mbuf *mh_nextpkt; /* Next packet in queue/record */
|
|
struct mbuf *mh_prevpkt; /* Flags aren't used in the output queue */
|
|
int mh_flags; /* Misc flags */
|
|
|
|
int mh_size; /* Size of data */
|
|
struct socket *mh_so;
|
|
|
|
caddr_t mh_data; /* Location of data */
|
|
int mh_len; /* Amount of data in this mbuf */
|
|
};
|
|
|
|
/*
|
|
* How much room is in the mbuf, from m_data to the end of the mbuf
|
|
*/
|
|
#define M_ROOM(m) ((m->m_flags & M_EXT)? \
|
|
(((m)->m_ext + (m)->m_size) - (m)->m_data) \
|
|
: \
|
|
(((m)->m_dat + (m)->m_size) - (m)->m_data))
|
|
|
|
/*
|
|
* How much free room there is
|
|
*/
|
|
#define M_FREEROOM(m) (M_ROOM(m) - (m)->m_len)
|
|
#define M_TRAILINGSPACE M_FREEROOM
|
|
|
|
struct mbuf {
|
|
struct m_hdr m_hdr;
|
|
Slirp *slirp;
|
|
union M_dat {
|
|
char m_dat_[1]; /* ANSI don't like 0 sized arrays */
|
|
char *m_ext_;
|
|
} M_dat;
|
|
};
|
|
|
|
#define m_next m_hdr.mh_next
|
|
#define m_prev m_hdr.mh_prev
|
|
#define m_nextpkt m_hdr.mh_nextpkt
|
|
#define m_prevpkt m_hdr.mh_prevpkt
|
|
#define m_flags m_hdr.mh_flags
|
|
#define m_len m_hdr.mh_len
|
|
#define m_data m_hdr.mh_data
|
|
#define m_size m_hdr.mh_size
|
|
#define m_dat M_dat.m_dat_
|
|
#define m_ext M_dat.m_ext_
|
|
#define m_so m_hdr.mh_so
|
|
|
|
#define ifq_prev m_prev
|
|
#define ifq_next m_next
|
|
#define ifs_prev m_prevpkt
|
|
#define ifs_next m_nextpkt
|
|
#define ifq_so m_so
|
|
|
|
#define M_EXT 0x01 /* m_ext points to more (malloced) data */
|
|
#define M_FREELIST 0x02 /* mbuf is on free list */
|
|
#define M_USEDLIST 0x04 /* XXX mbuf is on used list (for dtom()) */
|
|
#define M_DOFREE 0x08 /* when m_free is called on the mbuf, free()
|
|
* it rather than putting it on the free list */
|
|
|
|
void m_init(Slirp *);
|
|
struct mbuf * m_get(Slirp *);
|
|
void m_free(struct mbuf *);
|
|
void m_cat(register struct mbuf *, register struct mbuf *);
|
|
void m_inc(struct mbuf *, int);
|
|
void m_adj(struct mbuf *, int);
|
|
int m_copy(struct mbuf *, struct mbuf *, int, int);
|
|
struct mbuf * dtom(Slirp *, void *);
|
|
|
|
#endif
|