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rtnetlink: Honour NLM_F_ECHO flag in rtnl_delete_link

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This patch use the new helper unregister_netdevice_many_notify() for
rtnl_delete_link(), so that the kernel could reply unicast when userspace
 set NLM_F_ECHO flag to request the new created interface info.

At the same time, the parameters of rtnl_delete_link() need to be updated
since we need nlmsghdr and portid info.

Suggested-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Reviewed-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Hangbin Liu 2022-10-28 04:42:24 -04:00 committed by Jakub Kicinski
parent d88e136cab
commit f3a63cce1b
6 changed files with 9 additions and 8 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
include/net/rtnetlink.h
View file

@ -186,7 +186,7 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
const struct rtnl_link_ops *ops,
struct nlattr *tb[],
struct netlink_ext_ack *extack);
int rtnl_delete_link(struct net_device *dev);
int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh);
int rtnl_configure_link(struct net_device *dev, const struct ifinfomsg *ifm,
u32 portid, const struct nlmsghdr *nlh);

7
net/core/rtnetlink.c
View file

@ -3110,7 +3110,7 @@ static int rtnl_group_dellink(const struct net *net, int group)
return 0;
}
int rtnl_delete_link(struct net_device *dev)
int rtnl_delete_link(struct net_device *dev, u32 portid, const struct nlmsghdr *nlh)
{
const struct rtnl_link_ops *ops;
LIST_HEAD(list_kill);
@ -3120,7 +3120,7 @@ int rtnl_delete_link(struct net_device *dev)
return -EOPNOTSUPP;
ops->dellink(dev, &list_kill);
unregister_netdevice_many(&list_kill);
unregister_netdevice_many_notify(&list_kill, portid, nlh);
return 0;
}
@ -3130,6 +3130,7 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct net *net = sock_net(skb->sk);
u32 portid = NETLINK_CB(skb).portid;
struct net *tgt_net = net;
struct net_device *dev = NULL;
struct ifinfomsg *ifm;
@ -3171,7 +3172,7 @@ static int rtnl_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
goto out;
}
err = rtnl_delete_link(dev);
err = rtnl_delete_link(dev, portid, nlh);
out:
if (netnsid >= 0)

2
net/openvswitch/vport-geneve.c
View file

@ -91,7 +91,7 @@ static struct vport *geneve_tnl_create(const struct vport_parms *parms)
err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
if (err < 0) {
rtnl_delete_link(dev);
rtnl_delete_link(dev, 0, NULL);
rtnl_unlock();
ovs_vport_free(vport);
goto error;

2
net/openvswitch/vport-gre.c
View file

@ -57,7 +57,7 @@ static struct vport *gre_tnl_create(const struct vport_parms *parms)
err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
if (err < 0) {
rtnl_delete_link(dev);
rtnl_delete_link(dev, 0, NULL);
rtnl_unlock();
ovs_vport_free(vport);
return ERR_PTR(err);

2
net/openvswitch/vport-netdev.c
View file

@ -172,7 +172,7 @@ void ovs_netdev_tunnel_destroy(struct vport *vport)
* if it's not already shutting down.
*/
if (vport->dev->reg_state == NETREG_REGISTERED)
rtnl_delete_link(vport->dev);
rtnl_delete_link(vport->dev, 0, NULL);
netdev_put(vport->dev, &vport->dev_tracker);
vport->dev = NULL;
rtnl_unlock();

2
net/openvswitch/vport-vxlan.c
View file

@ -120,7 +120,7 @@ static struct vport *vxlan_tnl_create(const struct vport_parms *parms)
err = dev_change_flags(dev, dev->flags | IFF_UP, NULL);
if (err < 0) {
rtnl_delete_link(dev);
rtnl_delete_link(dev, 0, NULL);
rtnl_unlock();
ovs_vport_free(vport);
goto error;