460fec67ee
The essence of this patch is to stuff (almost) all global variables of the slirp stack into the structure Slirp. In this step, we still keep the structure as global variable, directly accessible by the whole stack. Changes to the external interface of slirp will be applied in the following patches. Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
128 lines
4.3 KiB
C
128 lines
4.3 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. 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 8.3 (Berkeley) 1/21/94
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* mbuf.h,v 1.9 1994/11/14 13:54:20 bde Exp
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*/
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#ifndef _MBUF_H_
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#define _MBUF_H_
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#define m_freem m_free
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#define MINCSIZE 4096 /* Amount to increase mbuf if too small */
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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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*/
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#define mtod(m,t) ((t)(m)->m_data)
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/* XXX About mbufs for slirp:
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* Only one mbuf is ever used in a chain, for each "cell" of data.
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* m_nextpkt points to the next packet, if fragmented.
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* If the data is too large, the M_EXT is used, and a larger block
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* is alloced. Therefore, m_free[m] must check for M_EXT and if set
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* free the m_ext. This is inefficient memory-wise, but who cares.
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*/
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/* XXX should union some of these! */
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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; /* Linked list of mbufs */
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struct mbuf *mh_prev;
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struct mbuf *mh_nextpkt; /* Next packet in queue/record */
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struct mbuf *mh_prevpkt; /* Flags aren't used in the output queue */
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int mh_flags; /* Misc flags */
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int mh_size; /* Size of data */
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struct socket *mh_so;
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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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};
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/*
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* How much room is in the mbuf, from m_data to the end of the mbuf
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*/
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#define M_ROOM(m) ((m->m_flags & M_EXT)? \
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(((m)->m_ext + (m)->m_size) - (m)->m_data) \
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: \
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(((m)->m_dat + (m)->m_size) - (m)->m_data))
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/*
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* How much free room there is
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*/
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#define M_FREEROOM(m) (M_ROOM(m) - (m)->m_len)
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#define M_TRAILINGSPACE M_FREEROOM
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struct mbuf {
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struct m_hdr m_hdr;
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Slirp *slirp;
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union M_dat {
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char m_dat_[1]; /* ANSI don't like 0 sized arrays */
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char *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_prev m_hdr.mh_prev
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#define m_nextpkt m_hdr.mh_nextpkt
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#define m_prevpkt m_hdr.mh_prevpkt
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#define m_flags m_hdr.mh_flags
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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_size m_hdr.mh_size
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#define m_dat M_dat.m_dat_
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#define m_ext M_dat.m_ext_
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#define m_so m_hdr.mh_so
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#define ifq_prev m_prev
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#define ifq_next m_next
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#define ifs_prev m_prevpkt
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#define ifs_next m_nextpkt
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#define ifq_so m_so
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#define M_EXT 0x01 /* m_ext points to more (malloced) data */
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#define M_FREELIST 0x02 /* mbuf is on free list */
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#define M_USEDLIST 0x04 /* XXX mbuf is on used list (for dtom()) */
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#define M_DOFREE 0x08 /* when m_free is called on the mbuf, free()
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* it rather than putting it on the free list */
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void m_init _P((Slirp *));
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struct mbuf * m_get _P((Slirp *));
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void m_free _P((struct mbuf *));
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void m_cat _P((register struct mbuf *, register struct mbuf *));
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void m_inc _P((struct mbuf *, int));
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void m_adj _P((struct mbuf *, int));
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int m_copy _P((struct mbuf *, struct mbuf *, int, int));
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struct mbuf * dtom _P((Slirp *, void *));
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#endif
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