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/* $Id: mbuf.h 28800 2010-04-27 08:22:32Z vboxsync $ */
/** @file
* NAT - mbuf handling (declarations/defines).
*/
/*
* Copyright (C) 2006-2010 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
/*
* This code is based on:
*
* 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 8.3 (Berkeley) 1/21/94
* mbuf.h,v 1.9 1994/11/14 13:54:20 bde Exp
*/
#ifndef _MBUF_H_
#define _MBUF_H_
#ifndef VBOX_WITH_SLIRP_BSD_MBUF
/* #define M_BUF_DEBUG */
#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
* dtom(x) - convert data pointer within mbuf to mbuf pointer (XXX)
*/
#define mtod(m,t) ((t)(m)->m_data)
/* #define dtom(x) ((struct mbuf *)((int)(x) & ~(M_SIZE-1))) */
/* 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 */
struct libalias *mh_la; /*Real freebsd store hocksin similar way*/
#ifdef M_BUF_DEBUG
int mh_id;
char *mh_allocation_at_file;
int mh_allocation_at_line;
#endif
};
/*
* 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;
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 m_la m_hdr.mh_la
#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 */
#define M_FRAG 0x0800 /* packet is a fragment of a larger packet */
#define M_FIRSTFRAG 0x1000 /* paket is first fragment */
#define M_LASTFRAG 0x2000 /* paket is last fragment */
extern int mbuf_alloced;
extern struct mbuf m_freelist, m_usedlist;
extern int mbuf_max;
void m_init (PNATState);
void m_fini(PNATState pData);
void msize_init (PNATState);
struct mbuf * m_get (PNATState);
void m_free (PNATState, struct mbuf *);
void m_cat (PNATState, 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 (PNATState, void *);
/*
* this macro should be used for validation and copying of Ethernet header where it really requred
*/
#define MBUF_HEAD(m) ((caddr_t)(((m)->m_flags & M_EXT) ? (m)->m_ext : (m)->m_dat))
#define MBUF_IP_HEADER(m) (caddr_t)(MBUF_HEAD(m) + if_maxlinkhdr)
#else /* VBOX_WITH_SLIRP_BSD_MBUF */
# include "bsd/sys/mbuf.h"
#endif /* VBOX_WITH_SLIRP_BSD_MBUF */
#endif /* _MBUF_H_ */
#if defined(M_BUF_DEBUG) && !defined(RT_OS_WINDOWS)
# define m_get(x) \
({ \
struct mbuf *mdb = m_get((x)); \
if(mdb) \
{ \
mdb->m_hdr.mh_allocation_at_file = __FILE__; \
mdb->m_hdr.mh_allocation_at_line = __LINE__; \
} \
LogRel(("NAT:m(id:%d, ptr: %p) allocated at: %s:%d\n", (mdb?mdb->m_hdr.mh_id:-1), mdb, __FILE__, __LINE__));\
mdb; \
})
# define m_free(x, m) \
({ \
(m)->m_hdr.mh_allocation_at_file = NULL; \
(m)->m_hdr.mh_allocation_at_line = 0; \
LogRel(("NAT:m(id:%d, ptr: %p) freed at: %s:%d\n", (m)->m_hdr.mh_id, (m), __FILE__, __LINE__)); \
m_free((x),(m)); \
})
#endif
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