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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2008 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef MBUF_H
#define MBUF_H
/*
* Handle both multicast and broadcast functions.
*/
#if P2MP
/* define this to enable special test mode */
/*#define MBUF_TEST*/
#include "basic.h"
#include "buffer.h"
struct multi_instance;
#define MBUF_INDEX(head, offset, size) (((head) + (offset)) & ((size)-1))
struct mbuf_buffer
{
struct buffer buf;
int refcount;
# define MF_UNICAST (1<<0)
unsigned int flags;
};
struct mbuf_item
{
struct mbuf_buffer *buffer;
struct multi_instance *instance;
};
struct mbuf_set
{
MUTEX_DEFINE (mutex);
unsigned int head;
unsigned int len;
unsigned int capacity;
unsigned int max_queued;
struct mbuf_item *array;
};
struct mbuf_set *mbuf_init (unsigned int size);
void mbuf_free (struct mbuf_set *ms);
struct mbuf_buffer *mbuf_alloc_buf (const struct buffer *buf);
void mbuf_free_buf (struct mbuf_buffer *mb);
void mbuf_add_item (struct mbuf_set *ms, const struct mbuf_item *item);
bool mbuf_extract_item (struct mbuf_set *ms, struct mbuf_item *item, const bool lock);
void mbuf_dereference_instance (struct mbuf_set *ms, struct multi_instance *mi);
static inline bool
mbuf_defined (const struct mbuf_set *ms)
{
return ms && ms->len;
}
static inline bool
mbuf_len (const struct mbuf_set *ms)
{
return ms->len;
}
static inline int
mbuf_maximum_queued (const struct mbuf_set *ms)
{
return (int) ms->max_queued;
}
static inline struct multi_instance *
mbuf_peek (struct mbuf_set *ms)
{
struct multi_instance *mbuf_peek_dowork (struct mbuf_set *ms);
if (mbuf_defined (ms))
return mbuf_peek_dowork (ms);
else
return NULL;
}
#endif
#endif
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