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