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![Li RongQing](/assets/img/avatar_default.png)
if local is NULL pointer, and the following access of local's dev will trigger panic, which is same as BUG_ON Signed-off-by: Li RongQing <lirongqing@baidu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
224 lines
5.4 KiB
C
224 lines
5.4 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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/if_arp.h>
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#include <linux/if_bridge.h>
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#include <linux/if_vlan.h>
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#include <linux/kernel.h>
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#include <linux/llc.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <linux/openvswitch.h>
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#include <linux/export.h>
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#include <net/ip_tunnels.h>
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#include <net/rtnetlink.h>
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#include "datapath.h"
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#include "vport.h"
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#include "vport-internal_dev.h"
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#include "vport-netdev.h"
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static struct vport_ops ovs_netdev_vport_ops;
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/* Must be called with rcu_read_lock. */
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static void netdev_port_receive(struct sk_buff *skb)
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{
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struct vport *vport;
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vport = ovs_netdev_get_vport(skb->dev);
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if (unlikely(!vport))
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goto error;
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if (unlikely(skb_warn_if_lro(skb)))
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goto error;
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/* Make our own copy of the packet. Otherwise we will mangle the
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* packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
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*/
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skb = skb_share_check(skb, GFP_ATOMIC);
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if (unlikely(!skb))
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return;
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if (skb->dev->type == ARPHRD_ETHER) {
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skb_push(skb, ETH_HLEN);
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skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
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}
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ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
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return;
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error:
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kfree_skb(skb);
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}
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/* Called with rcu_read_lock and bottom-halves disabled. */
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static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
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{
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struct sk_buff *skb = *pskb;
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if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
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return RX_HANDLER_PASS;
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netdev_port_receive(skb);
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return RX_HANDLER_CONSUMED;
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}
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static struct net_device *get_dpdev(const struct datapath *dp)
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{
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struct vport *local;
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local = ovs_vport_ovsl(dp, OVSP_LOCAL);
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return local->dev;
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}
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struct vport *ovs_netdev_link(struct vport *vport, const char *name)
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{
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int err;
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vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
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if (!vport->dev) {
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err = -ENODEV;
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goto error_free_vport;
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}
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if (vport->dev->flags & IFF_LOOPBACK ||
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(vport->dev->type != ARPHRD_ETHER &&
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vport->dev->type != ARPHRD_NONE) ||
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ovs_is_internal_dev(vport->dev)) {
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err = -EINVAL;
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goto error_put;
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}
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rtnl_lock();
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err = netdev_master_upper_dev_link(vport->dev,
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get_dpdev(vport->dp),
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NULL, NULL, NULL);
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if (err)
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goto error_unlock;
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err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
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vport);
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if (err)
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goto error_master_upper_dev_unlink;
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dev_disable_lro(vport->dev);
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dev_set_promiscuity(vport->dev, 1);
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vport->dev->priv_flags |= IFF_OVS_DATAPATH;
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rtnl_unlock();
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return vport;
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error_master_upper_dev_unlink:
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netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
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error_unlock:
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rtnl_unlock();
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error_put:
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dev_put(vport->dev);
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error_free_vport:
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ovs_vport_free(vport);
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return ERR_PTR(err);
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}
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EXPORT_SYMBOL_GPL(ovs_netdev_link);
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static struct vport *netdev_create(const struct vport_parms *parms)
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{
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struct vport *vport;
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vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
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if (IS_ERR(vport))
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return vport;
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return ovs_netdev_link(vport, parms->name);
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}
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static void vport_netdev_free(struct rcu_head *rcu)
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{
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struct vport *vport = container_of(rcu, struct vport, rcu);
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if (vport->dev)
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dev_put(vport->dev);
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ovs_vport_free(vport);
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}
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void ovs_netdev_detach_dev(struct vport *vport)
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{
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ASSERT_RTNL();
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vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
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netdev_rx_handler_unregister(vport->dev);
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netdev_upper_dev_unlink(vport->dev,
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netdev_master_upper_dev_get(vport->dev));
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dev_set_promiscuity(vport->dev, -1);
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}
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static void netdev_destroy(struct vport *vport)
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{
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rtnl_lock();
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if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
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ovs_netdev_detach_dev(vport);
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rtnl_unlock();
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call_rcu(&vport->rcu, vport_netdev_free);
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}
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void ovs_netdev_tunnel_destroy(struct vport *vport)
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{
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rtnl_lock();
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if (vport->dev->priv_flags & IFF_OVS_DATAPATH)
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ovs_netdev_detach_dev(vport);
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/* We can be invoked by both explicit vport deletion and
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* underlying netdev deregistration; delete the link only
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* if it's not already shutting down.
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*/
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if (vport->dev->reg_state == NETREG_REGISTERED)
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rtnl_delete_link(vport->dev);
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dev_put(vport->dev);
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vport->dev = NULL;
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rtnl_unlock();
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call_rcu(&vport->rcu, vport_netdev_free);
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}
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EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
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/* Returns null if this device is not attached to a datapath. */
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struct vport *ovs_netdev_get_vport(struct net_device *dev)
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{
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if (likely(dev->priv_flags & IFF_OVS_DATAPATH))
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return (struct vport *)
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rcu_dereference_rtnl(dev->rx_handler_data);
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else
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return NULL;
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}
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static struct vport_ops ovs_netdev_vport_ops = {
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.type = OVS_VPORT_TYPE_NETDEV,
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.create = netdev_create,
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.destroy = netdev_destroy,
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.send = dev_queue_xmit,
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};
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int __init ovs_netdev_init(void)
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{
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return ovs_vport_ops_register(&ovs_netdev_vport_ops);
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}
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void ovs_netdev_exit(void)
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{
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ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
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}
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