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/*
* Copyright 2015 Futurewei Inc.
*
* l2fwd is free software: you can redistribute it and/or modify
* it under the terms of version 2 the GNU General Public License as published
* by the Free Software Foundation only
* l2fwd 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 code. If not, see
* https://www.gnu.org/licenses/gpl-2.0.html
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/aer.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/if.h>
#include <linux/if_ether.h>
#include <linux/in.h>
#include <linux/rtnetlink.h>
#include <linux/prefetch.h>
#include <linux/log2.h>
static char *net1 = "eth1";
module_param(net1, charp, 0);
MODULE_PARM_DESC(net1, "The first net device name (default is eth1)");
static char *net2 = "eth2";
module_param(net2, charp, 0);
MODULE_PARM_DESC(net2, "The second net device name (default is eth2)");
static bool print = false;
module_param(print, bool, 0);
MODULE_PARM_DESC(print, "Log forwarding statistics (default is false)");
static int stats_interval = 10000;
module_param(stats_interval, int, 0);
MODULE_PARM_DESC(print, "Forwarding statistics packet interval (default is 10000)");
static bool terminate = false;
module_param(terminate, bool, 0);
MODULE_PARM_DESC(terminate, "Free skb instead of forwarding");
static struct net_device *dev1, *dev2;
int count;
static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct net_device *dev;
if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
return RX_HANDLER_PASS;
dev = (struct net_device*) rcu_dereference_rtnl(skb->dev->rx_handler_data);
count++;
if ( ((count % stats_interval) == 0) && print )
printk("l2fwd count %d\n", count);
if (terminate)
{
kfree_skb(skb);
}
else
{
skb->dev = dev;
skb_push(skb, ETH_HLEN);
dev_queue_xmit(skb);
}
return RX_HANDLER_CONSUMED;
}
static int __init l2fwd_init_module(void)
{
int err = -1;
dev1 = dev_get_by_name(&init_net, net1);
if (!dev1)
{
printk("can't get device %s\n", net1);
err = -ENODEV;
goto out;
}
dev2 = dev_get_by_name(&init_net, net2);
if (!dev2)
{
printk("can't get device %s\n", net2);
err = -ENODEV;
goto out_dev1;
}
rtnl_lock();
err = netdev_rx_handler_register(dev1, netdev_frame_hook, dev2);
if (err)
{
printk("can't register rx_handler for device %s\n", net1);
goto out_dev2;
}
dev_set_promiscuity(dev1, 1);
err = netdev_rx_handler_register(dev2, netdev_frame_hook, dev1);
if (err)
{
printk("can't register rx_handler for device %s\n", net2);
netdev_rx_handler_unregister(dev1);
goto out_dev2;
}
dev_set_promiscuity(dev2, 1);
rtnl_unlock();
return 0;
out_dev2:
rtnl_unlock();
dev_put(dev2);
dev2 = NULL;
out_dev1:
dev_put(dev1);
dev1 = NULL;
out:
return err;
}
static void __exit l2fwd_exit_module(void)
{
rtnl_lock();
if (dev2)
{
dev_put(dev2);
netdev_rx_handler_unregister(dev1);
}
if (dev1)
{
dev_put(dev1);
netdev_rx_handler_unregister(dev2);
}
dev_set_promiscuity(dev1, -1);
dev_set_promiscuity(dev2, -1);
rtnl_unlock();
}
module_init(l2fwd_init_module);
module_exit(l2fwd_exit_module);
MODULE_DESCRIPTION("Huawei L2 Forwarding module");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1");
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