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ipvlan: assign unique dev-id for each slave device.

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IPvlan setup uses one mac-address (of master). The IPv6 link-local
addresses are derived using the mac-address on the link. Lack of
dev-ids makes these link-local addresses same for all slaves including
that of master device. dev-ids are necessary to add differentiation
when L2 address is shared.

Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Mahesh Bandewar 2017-01-03 12:47:16 -08:00 committed by David S. Miller
parent a896eee334
commit 009146d117
2 changed files with 17 additions and 1 deletions
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1
drivers/net/ipvlan/ipvlan.h
View File

@ -97,6 +97,7 @@ struct ipvl_port {
struct work_struct wq;
struct sk_buff_head backlog;
int count;
struct ida ida;
};
struct ipvl_skb_cb {

17
drivers/net/ipvlan/ipvlan_main.c
View File

@ -119,6 +119,7 @@ static int ipvlan_port_create(struct net_device *dev)
skb_queue_head_init(&port->backlog);
INIT_WORK(&port->wq, ipvlan_process_multicast);
ida_init(&port->ida);
err = netdev_rx_handler_register(dev, ipvlan_handle_frame, port);
if (err)
@ -150,6 +151,7 @@ static void ipvlan_port_destroy(struct net_device *dev)
dev_put(skb->dev);
kfree_skb(skb);
}
ida_destroy(&port->ida);
kfree(port);
}
@ -533,6 +535,16 @@ static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
ipvlan_adjust_mtu(ipvlan, phy_dev);
INIT_LIST_HEAD(&ipvlan->addrs);
/* Since L2 address is shared among all IPvlan slaves including
* master, use unique 16 bit dev-ids to diffentiate among them.
* Assign IDs between 0x1 and 0xFFFE (used by the master) to each
* slave link [see addrconf_ifid_eui48()].
*/
err = ida_simple_get(&port->ida, 1, 0xFFFE, GFP_KERNEL);
if (err < 0)
goto destroy_ipvlan_port;
dev->dev_id = err;
/* TODO Probably put random address here to be presented to the
* world but keep using the physical-dev address for the outgoing
* packets.
@ -543,7 +555,7 @@ static int ipvlan_link_new(struct net *src_net, struct net_device *dev,
err = register_netdevice(dev);
if (err < 0)
goto destroy_ipvlan_port;
goto remove_ida;
err = netdev_upper_dev_link(phy_dev, dev);
if (err) {
@ -562,6 +574,8 @@ unlink_netdev:
netdev_upper_dev_unlink(phy_dev, dev);
unregister_netdev:
unregister_netdevice(dev);
remove_ida:
ida_simple_remove(&port->ida, dev->dev_id);
destroy_ipvlan_port:
if (create)
ipvlan_port_destroy(phy_dev);
@ -579,6 +593,7 @@ static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
kfree_rcu(addr, rcu);
}
ida_simple_remove(&ipvlan->port->ida, dev->dev_id);
list_del_rcu(&ipvlan->pnode);
unregister_netdevice_queue(dev, head);
netdev_upper_dev_unlink(ipvlan->phy_dev, dev);