/* * Copyright (c) 2007-2012 Nicira, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License 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 */ #include <linux/hardirq.h>#include <linux/if_vlan.h>#include <linux/kernel.h>#include <linux/netdevice.h>#include <linux/etherdevice.h>#include <linux/ethtool.h>#include <linux/skbuff.h> #include <net/dst.h>#include <net/xfrm.h> #include "datapath.h"#include "vport-internal_dev.h"#include "vport-netdev.h" struct internal_dev {	struct vport *vport;}; static struct internal_dev *internal_dev_priv(struct net_device *netdev){	return netdev_priv(netdev);} /* This function is only called by the kernel network layer.*/static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,							struct rtnl_link_stats64 *stats){	struct vport *vport = ovs_internal_dev_get_vport(netdev);	struct ovs_vport_stats vport_stats; 	ovs_vport_get_stats(vport, &vport_stats); 	/* The tx and rx stats need to be swapped because the	 * switch and host OS have opposite perspectives. */	stats->rx_packets	= vport_stats.tx_packets;	stats->tx_packets	= vport_stats.rx_packets;	stats->rx_bytes		= vport_stats.tx_bytes;	stats->tx_bytes		= vport_stats.rx_bytes;	stats->rx_errors	= vport_stats.tx_errors;	stats->tx_errors	= vport_stats.rx_errors;	stats->rx_dropped	= vport_stats.tx_dropped;	stats->tx_dropped	= vport_stats.rx_dropped; 	return stats;} /* Called with rcu_read_lock_bh. */static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev){	rcu_read_lock();	ovs_vport_receive(internal_dev_priv(netdev)->vport, skb, NULL);	rcu_read_unlock();	return 0;} static int internal_dev_open(struct net_device *netdev){	netif_start_queue(netdev);	return 0;} static int internal_dev_stop(struct net_device *netdev){	netif_stop_queue(netdev);	return 0;} static void internal_dev_getinfo(struct net_device *netdev,				 struct ethtool_drvinfo *info){	strlcpy(info->driver, "openvswitch", sizeof(info->driver));} static const struct ethtool_ops internal_dev_ethtool_ops = {	.get_drvinfo	= internal_dev_getinfo,	.get_link	= ethtool_op_get_link,}; static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu){	if (new_mtu < 68)		return -EINVAL; 	netdev->mtu = new_mtu;	return 0;} static void internal_dev_destructor(struct net_device *dev){	struct vport *vport = ovs_internal_dev_get_vport(dev); 	ovs_vport_free(vport);	free_netdev(dev);} static const struct net_device_ops internal_dev_netdev_ops = {	.ndo_open = internal_dev_open,	.ndo_stop = internal_dev_stop,	.ndo_start_xmit = internal_dev_xmit,	.ndo_set_mac_address = eth_mac_addr,	.ndo_change_mtu = internal_dev_change_mtu,	.ndo_get_stats64 = internal_dev_get_stats,}; static void do_setup(struct net_device *netdev){	ether_setup(netdev); 	netdev->netdev_ops = &internal_dev_netdev_ops; 	netdev->priv_flags &= ~IFF_TX_SKB_SHARING;	netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;	netdev->destructor = internal_dev_destructor;	SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);	netdev->tx_queue_len = 0; 	netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |			   NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_GSO_SOFTWARE; 	netdev->vlan_features = netdev->features;	netdev->features |= NETIF_F_HW_VLAN_CTAG_TX;	netdev->hw_features = netdev->features & ~NETIF_F_LLTX;	eth_hw_addr_random(netdev);} static struct vport *internal_dev_create(const struct vport_parms *parms){	struct vport *vport;	struct netdev_vport *netdev_vport;	struct internal_dev *internal_dev;	int err; 	vport = ovs_vport_alloc(sizeof(struct netdev_vport),				&ovs_internal_vport_ops, parms);	if (IS_ERR(vport)) {		err = PTR_ERR(vport);		goto error;	} 	netdev_vport = netdev_vport_priv(vport); 	netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),					 parms->name, do_setup);	if (!netdev_vport->dev) {		err = -ENOMEM;		goto error_free_vport;	} 	dev_net_set(netdev_vport->dev, ovs_dp_get_net(vport->dp));	internal_dev = internal_dev_priv(netdev_vport->dev);	internal_dev->vport = vport; 	/* Restrict bridge port to current netns. */	if (vport->port_no == OVSP_LOCAL)		netdev_vport->dev->features |= NETIF_F_NETNS_LOCAL; 	rtnl_lock();	err = register_netdevice(netdev_vport->dev);	if (err)		goto error_free_netdev; 	dev_set_promiscuity(netdev_vport->dev, 1);	rtnl_unlock();	netif_start_queue(netdev_vport->dev); 	return vport; error_free_netdev:	rtnl_unlock();	free_netdev(netdev_vport->dev);error_free_vport:	ovs_vport_free(vport);error:	return ERR_PTR(err);} static void internal_dev_destroy(struct vport *vport){	struct netdev_vport *netdev_vport = netdev_vport_priv(vport); 	netif_stop_queue(netdev_vport->dev);	rtnl_lock();	dev_set_promiscuity(netdev_vport->dev, -1); 	/* unregister_netdevice() waits for an RCU grace period. */	unregister_netdevice(netdev_vport->dev); 	rtnl_unlock();} static int internal_dev_recv(struct vport *vport, struct sk_buff *skb){	struct net_device *netdev = netdev_vport_priv(vport)->dev;	int len; 	len = skb->len; 	skb_dst_drop(skb);	nf_reset(skb);	secpath_reset(skb); 	skb->dev = netdev;	skb->pkt_type = PACKET_HOST;	skb->protocol = eth_type_trans(skb, netdev);	skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN); 	netif_rx(skb); 	return len;} const struct vport_ops ovs_internal_vport_ops = {	.type		= OVS_VPORT_TYPE_INTERNAL,	.create		= internal_dev_create,	.destroy	= internal_dev_destroy,	.get_name	= ovs_netdev_get_name,	.send		= internal_dev_recv,}; int ovs_is_internal_dev(const struct net_device *netdev){	return netdev->netdev_ops == &internal_dev_netdev_ops;} struct vport *ovs_internal_dev_get_vport(struct net_device *netdev){	if (!ovs_is_internal_dev(netdev))		return NULL; 	return internal_dev_priv(netdev)->vport;}