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rtnetlink: allow rtnl_fill_link_netnsid() to run under RCU protection

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We want to be able to run rtnl_fill_ifinfo() under RCU protection
instead of RTNL in the future.

All rtnl_link_ops->get_link_net() methods already using dev_net()
are ready. I added READ_ONCE() annotations on others.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Eric Dumazet 2024-05-03 19:20:59 +00:00 committed by Paolo Abeni
parent 979aad40da
commit 9cf621bd5f
6 changed files with 7 additions and 8 deletions
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2
drivers/net/ppp/ppp_generic.c
View File

@ -1357,7 +1357,7 @@ static struct net *ppp_nl_get_link_net(const struct net_device *dev)
{
struct ppp *ppp = netdev_priv(dev);
return ppp->ppp_net;
return READ_ONCE(ppp->ppp_net);
}
static struct rtnl_link_ops ppp_link_ops __read_mostly = {

2
drivers/net/vxlan/vxlan_core.c
View File

@ -4569,7 +4569,7 @@ static struct net *vxlan_get_link_net(const struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
return vxlan->net;
return READ_ONCE(vxlan->net);
}
static struct rtnl_link_ops vxlan_link_ops __read_mostly = {

5
net/core/rtnetlink.c
View File

@ -1923,9 +1923,6 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
goto nla_put_failure;
}
if (rtnl_fill_link_netnsid(skb, dev, src_net, gfp))
goto nla_put_failure;
if (new_nsid &&
nla_put_s32(skb, IFLA_NEW_NETNSID, *new_nsid) < 0)
goto nla_put_failure;
@ -1938,6 +1935,8 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
goto nla_put_failure;
rcu_read_lock();
if (rtnl_fill_link_netnsid(skb, dev, src_net, GFP_ATOMIC))
goto nla_put_failure_rcu;
qdisc = rcu_dereference(dev->qdisc);
if (qdisc && nla_put_string(skb, IFLA_QDISC, qdisc->ops->id))
goto nla_put_failure_rcu;

2
net/ipv4/ip_tunnel.c
View File

@ -1120,7 +1120,7 @@ struct net *ip_tunnel_get_link_net(const struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
return tunnel->net;
return READ_ONCE(tunnel->net);
}
EXPORT_SYMBOL(ip_tunnel_get_link_net);

2
net/ipv6/ip6_tunnel.c
View File

@ -2146,7 +2146,7 @@ struct net *ip6_tnl_get_link_net(const struct net_device *dev)
{
struct ip6_tnl *tunnel = netdev_priv(dev);
return tunnel->net;
return READ_ONCE(tunnel->net);
}
EXPORT_SYMBOL(ip6_tnl_get_link_net);

2
net/xfrm/xfrm_interface_core.c
View File

@ -926,7 +926,7 @@ static struct net *xfrmi_get_link_net(const struct net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
return xi->net;
return READ_ONCE(xi->net);
}
static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {