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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) 2002-2009 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
*/
#include "syshead.h"
#if P2MP
#include "buffer.h"
#include "error.h"
#include "misc.h"
#include "mbuf.h"
#include "memdbg.h"
struct mbuf_set *
mbuf_init (unsigned int size)
{
struct mbuf_set *ret;
ALLOC_OBJ_CLEAR (ret, struct mbuf_set);
mutex_init (&ret->mutex);
ret->capacity = adjust_power_of_2 (size);
ALLOC_ARRAY (ret->array, struct mbuf_item, ret->capacity);
return ret;
}
void
mbuf_free (struct mbuf_set *ms)
{
if (ms)
{
int i;
for (i = 0; i < (int) ms->len; ++i)
{
struct mbuf_item *item = &ms->array[MBUF_INDEX(ms->head, i, ms->capacity)];
mbuf_free_buf (item->buffer);
}
free (ms->array);
mutex_destroy (&ms->mutex);
free (ms);
}
}
struct mbuf_buffer *
mbuf_alloc_buf (const struct buffer *buf)
{
struct mbuf_buffer *ret;
ALLOC_OBJ (ret, struct mbuf_buffer);
ret->buf = clone_buf (buf);
ret->refcount = 1;
ret->flags = 0;
return ret;
}
void
mbuf_free_buf (struct mbuf_buffer *mb)
{
if (mb)
{
if (--mb->refcount <= 0)
{
free_buf (&mb->buf);
free (mb);
}
}
}
void
mbuf_add_item (struct mbuf_set *ms, const struct mbuf_item *item)
{
ASSERT (ms);
mutex_lock (&ms->mutex);
if (ms->len == ms->capacity)
{
struct mbuf_item rm;
ASSERT (mbuf_extract_item (ms, &rm, false));
mbuf_free_buf (rm.buffer);
msg (D_MULTI_DROPPED, "MBUF: mbuf packet dropped");
}
ASSERT (ms->len < ms->capacity);
ms->array[MBUF_INDEX(ms->head, ms->len, ms->capacity)] = *item;
if (++ms->len > ms->max_queued)
ms->max_queued = ms->len;
++item->buffer->refcount;
mutex_unlock (&ms->mutex);
}
bool
mbuf_extract_item (struct mbuf_set *ms, struct mbuf_item *item, const bool lock)
{
bool ret = false;
if (ms)
{
if (lock)
mutex_lock (&ms->mutex);
while (ms->len)
{
*item = ms->array[ms->head];
ms->head = MBUF_INDEX(ms->head, 1, ms->capacity);
--ms->len;
if (item->instance) /* ignore dereferenced instances */
{
ret = true;
break;
}
}
if (lock)
mutex_unlock (&ms->mutex);
}
return ret;
}
struct multi_instance *
mbuf_peek_dowork (struct mbuf_set *ms)
{
struct multi_instance *ret = NULL;
if (ms)
{
int i;
mutex_lock (&ms->mutex);
for (i = 0; i < (int) ms->len; ++i)
{
struct mbuf_item *item = &ms->array[MBUF_INDEX(ms->head, i, ms->capacity)];
if (item->instance)
{
ret = item->instance;
break;
}
}
mutex_unlock (&ms->mutex);
}
return ret;
}
void
mbuf_dereference_instance (struct mbuf_set *ms, struct multi_instance *mi)
{
if (ms)
{
int i;
mutex_lock (&ms->mutex);
for (i = 0; i < (int) ms->len; ++i)
{
struct mbuf_item *item = &ms->array[MBUF_INDEX(ms->head, i, ms->capacity)];
if (item->instance == mi)
{
mbuf_free_buf (item->buffer);
item->buffer = NULL;
item->instance = NULL;
msg (D_MBUF, "MBUF: dereferenced queued packet");
}
}
mutex_unlock (&ms->mutex);
}
}
#else
static void dummy(void) {}
#endif /* P2MP */
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