forked from Minki/linux
7fe99e2d43
It's possible that packets that are sent on internal devices (from the OVS perspective) have already traversed the local IP stack. After they go through the internal device, they will again travel through the IP stack which may get confused by the presence of existing information in the skb. The problem can be observed when switching between namespaces. This clears out that information to avoid problems but deliberately leaves other metadata alone. This is to provide maximum flexibility in chaining together OVS and other Linux components. Signed-off-by: Jesse Gross <jesse@nicira.com>
250 lines
6.2 KiB
C
250 lines
6.2 KiB
C
/*
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* Copyright (c) 2007-2012 Nicira, Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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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
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#include <linux/hardirq.h>
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#include <linux/if_vlan.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/ethtool.h>
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#include <linux/skbuff.h>
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#include <net/dst.h>
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#include <net/xfrm.h>
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#include "datapath.h"
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#include "vport-internal_dev.h"
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#include "vport-netdev.h"
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struct internal_dev {
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struct vport *vport;
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};
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static struct internal_dev *internal_dev_priv(struct net_device *netdev)
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{
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return netdev_priv(netdev);
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}
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/* This function is only called by the kernel network layer.*/
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static struct rtnl_link_stats64 *internal_dev_get_stats(struct net_device *netdev,
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struct rtnl_link_stats64 *stats)
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{
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struct vport *vport = ovs_internal_dev_get_vport(netdev);
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struct ovs_vport_stats vport_stats;
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ovs_vport_get_stats(vport, &vport_stats);
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/* The tx and rx stats need to be swapped because the
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* switch and host OS have opposite perspectives. */
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stats->rx_packets = vport_stats.tx_packets;
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stats->tx_packets = vport_stats.rx_packets;
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stats->rx_bytes = vport_stats.tx_bytes;
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stats->tx_bytes = vport_stats.rx_bytes;
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stats->rx_errors = vport_stats.tx_errors;
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stats->tx_errors = vport_stats.rx_errors;
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stats->rx_dropped = vport_stats.tx_dropped;
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stats->tx_dropped = vport_stats.rx_dropped;
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return stats;
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}
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static int internal_dev_mac_addr(struct net_device *dev, void *p)
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{
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struct sockaddr *addr = p;
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if (!is_valid_ether_addr(addr->sa_data))
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return -EADDRNOTAVAIL;
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dev->addr_assign_type &= ~NET_ADDR_RANDOM;
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memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
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return 0;
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}
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/* Called with rcu_read_lock_bh. */
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static int internal_dev_xmit(struct sk_buff *skb, struct net_device *netdev)
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{
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rcu_read_lock();
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ovs_vport_receive(internal_dev_priv(netdev)->vport, skb);
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rcu_read_unlock();
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return 0;
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}
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static int internal_dev_open(struct net_device *netdev)
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{
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netif_start_queue(netdev);
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return 0;
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}
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static int internal_dev_stop(struct net_device *netdev)
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{
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netif_stop_queue(netdev);
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return 0;
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}
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static void internal_dev_getinfo(struct net_device *netdev,
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struct ethtool_drvinfo *info)
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{
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strcpy(info->driver, "openvswitch");
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}
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static const struct ethtool_ops internal_dev_ethtool_ops = {
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.get_drvinfo = internal_dev_getinfo,
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.get_link = ethtool_op_get_link,
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};
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static int internal_dev_change_mtu(struct net_device *netdev, int new_mtu)
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{
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if (new_mtu < 68)
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return -EINVAL;
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netdev->mtu = new_mtu;
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return 0;
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}
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static void internal_dev_destructor(struct net_device *dev)
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{
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struct vport *vport = ovs_internal_dev_get_vport(dev);
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ovs_vport_free(vport);
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free_netdev(dev);
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}
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static const struct net_device_ops internal_dev_netdev_ops = {
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.ndo_open = internal_dev_open,
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.ndo_stop = internal_dev_stop,
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.ndo_start_xmit = internal_dev_xmit,
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.ndo_set_mac_address = internal_dev_mac_addr,
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.ndo_change_mtu = internal_dev_change_mtu,
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.ndo_get_stats64 = internal_dev_get_stats,
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};
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static void do_setup(struct net_device *netdev)
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{
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ether_setup(netdev);
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netdev->netdev_ops = &internal_dev_netdev_ops;
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netdev->priv_flags &= ~IFF_TX_SKB_SHARING;
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netdev->destructor = internal_dev_destructor;
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SET_ETHTOOL_OPS(netdev, &internal_dev_ethtool_ops);
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netdev->tx_queue_len = 0;
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netdev->features = NETIF_F_LLTX | NETIF_F_SG | NETIF_F_FRAGLIST |
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NETIF_F_HIGHDMA | NETIF_F_HW_CSUM | NETIF_F_TSO;
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netdev->vlan_features = netdev->features;
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netdev->features |= NETIF_F_HW_VLAN_TX;
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netdev->hw_features = netdev->features & ~NETIF_F_LLTX;
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eth_hw_addr_random(netdev);
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}
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static struct vport *internal_dev_create(const struct vport_parms *parms)
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{
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struct vport *vport;
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struct netdev_vport *netdev_vport;
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struct internal_dev *internal_dev;
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int err;
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vport = ovs_vport_alloc(sizeof(struct netdev_vport),
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&ovs_internal_vport_ops, parms);
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if (IS_ERR(vport)) {
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err = PTR_ERR(vport);
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goto error;
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}
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netdev_vport = netdev_vport_priv(vport);
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netdev_vport->dev = alloc_netdev(sizeof(struct internal_dev),
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parms->name, do_setup);
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if (!netdev_vport->dev) {
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err = -ENOMEM;
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goto error_free_vport;
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}
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internal_dev = internal_dev_priv(netdev_vport->dev);
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internal_dev->vport = vport;
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err = register_netdevice(netdev_vport->dev);
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if (err)
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goto error_free_netdev;
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dev_set_promiscuity(netdev_vport->dev, 1);
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netif_start_queue(netdev_vport->dev);
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return vport;
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error_free_netdev:
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free_netdev(netdev_vport->dev);
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error_free_vport:
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ovs_vport_free(vport);
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error:
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return ERR_PTR(err);
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}
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static void internal_dev_destroy(struct vport *vport)
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{
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struct netdev_vport *netdev_vport = netdev_vport_priv(vport);
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netif_stop_queue(netdev_vport->dev);
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dev_set_promiscuity(netdev_vport->dev, -1);
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/* unregister_netdevice() waits for an RCU grace period. */
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unregister_netdevice(netdev_vport->dev);
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}
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static int internal_dev_recv(struct vport *vport, struct sk_buff *skb)
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{
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struct net_device *netdev = netdev_vport_priv(vport)->dev;
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int len;
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len = skb->len;
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skb_dst_drop(skb);
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nf_reset(skb);
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secpath_reset(skb);
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skb->dev = netdev;
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skb->pkt_type = PACKET_HOST;
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skb->protocol = eth_type_trans(skb, netdev);
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netif_rx(skb);
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return len;
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}
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const struct vport_ops ovs_internal_vport_ops = {
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.type = OVS_VPORT_TYPE_INTERNAL,
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.create = internal_dev_create,
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.destroy = internal_dev_destroy,
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.get_name = ovs_netdev_get_name,
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.get_ifindex = ovs_netdev_get_ifindex,
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.send = internal_dev_recv,
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};
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int ovs_is_internal_dev(const struct net_device *netdev)
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{
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return netdev->netdev_ops == &internal_dev_netdev_ops;
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}
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struct vport *ovs_internal_dev_get_vport(struct net_device *netdev)
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{
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if (!ovs_is_internal_dev(netdev))
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return NULL;
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return internal_dev_priv(netdev)->vport;
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}
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