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/*
* Copyright (C) 2007 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include <sys/types.h>
#include <libbridge.h>
#include <debug.h>
#include <utils/linked_list.h>
#include "bridge.h"
typedef struct private_bridge_t private_bridge_t;
struct private_bridge_t {
/** public interface */
bridge_t public;
/** device name */
char *name;
/** list of attached interfaces */
linked_list_t *ifaces;
};
/**
* Implementation of bridge_t.get_name.
*/
static char* get_name(private_bridge_t *this)
{
return this->name;
}
/**
* Implementation of bridge_t.create_iface_iterator.
*/
static iterator_t* create_iface_iterator(private_bridge_t *this)
{
return this->ifaces->create_iterator(this->ifaces, TRUE);
}
/**
* Implementation of bridge_t.disconnect_iface.
*/
static bool disconnect_iface(private_bridge_t *this, iface_t *iface)
{
iterator_t *iterator;
iface_t *current;
bool good = FALSE;
iterator = this->ifaces->create_iterator(this->ifaces, TRUE);
while (iterator->iterate(iterator, (void**)¤t))
{
if (current == iface)
{
if (br_del_interface(this->name, iface->get_hostif(iface)) != 0)
{
DBG1("removing iface '%s' from bridge '%s' in kernel failed: %m",
iface->get_hostif(iface), this->name);
}
else
{
iface->set_bridge(iface, NULL);
good = TRUE;
}
break;
}
}
if (iface != current)
{
DBG1("iface '%s' not found on bridge '%s'", iface->get_hostif(iface),
this->name);
}
iterator->destroy(iterator);
return good;
}
/**
* Implementation of bridge_t.connect_iface.
*/
static bool connect_iface(private_bridge_t *this, iface_t *iface)
{
if (br_add_interface(this->name, iface->get_hostif(iface)) != 0)
{
DBG1("adding iface '%s' to bridge '%s' failed: %m",
iface->get_hostif(iface), this->name);
return FALSE;
}
iface->set_bridge(iface, &this->public);
this->ifaces->insert_last(this->ifaces, iface);
return TRUE;
}
/**
* instance counter to (de-)initialize libbridge
*/
static int instances = 0;
/**
* unregister an interface from bridge
*/
static void unregister(iface_t *iface)
{
iface->set_bridge(iface, NULL);
}
/**
* Implementation of bridge_t.destroy.
*/
static void destroy(private_bridge_t *this)
{
this->ifaces->invoke_function(this->ifaces, (void(*)(void*))unregister);
this->ifaces->destroy(this->ifaces);
if (br_del_bridge(this->name) != 0)
{
DBG1("deleting bridge '%s' from kernel failed: %m", this->name);
}
free(this->name);
free(this);
if (--instances == 0)
{
br_shutdown();
}
}
/**
* create the bridge instance
*/
bridge_t *bridge_create(char *name)
{
private_bridge_t *this;
if (instances == 0)
{
if (br_init() != 0)
{
DBG1("libbridge initialization failed: %m");
return NULL;
}
}
this = malloc_thing(private_bridge_t);
this->public.get_name = (char*(*)(bridge_t*))get_name;
this->public.create_iface_iterator = (iterator_t*(*)(bridge_t*))create_iface_iterator;
this->public.disconnect_iface = (bool(*)(bridge_t*, iface_t *iface))disconnect_iface;
this->public.connect_iface = (bool(*)(bridge_t*, iface_t *iface))connect_iface;
this->public.destroy = (void*)destroy;
if (br_add_bridge(name) != 0)
{
DBG1("creating bridge '%s' failed: %m", name);
free(this);
return NULL;
}
this->name = strdup(name);
this->ifaces = linked_list_create();
instances++;
return &this->public;
}
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