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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) 2002-2021 OpenVPN 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; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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
{
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);
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 unsigned int
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;
}
struct multi_instance *mbuf_peek_dowork(struct mbuf_set *ms);
static inline struct multi_instance *
mbuf_peek(struct mbuf_set *ms)
{
if (mbuf_defined(ms))
{
return mbuf_peek_dowork(ms);
}
else
{
return NULL;
}
}
#endif /* if P2MP */
#endif /* ifndef MBUF_H */
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