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rtnetlink: prepare nla_put_iflink() to run under RCU
We want to be able to run rtnl_fill_ifinfo() under RCU protection instead of RTNL in the future. This patch prepares dev_get_iflink() and nla_put_iflink() to run either with RTNL or RCU held. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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5f6000aa24
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@ -1272,10 +1272,10 @@ static int ipoib_get_iflink(const struct net_device *dev)
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/* parent interface */
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if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
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return dev->ifindex;
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return READ_ONCE(dev->ifindex);
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/* child/vlan interface */
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return priv->parent->ifindex;
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return READ_ONCE(priv->parent->ifindex);
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}
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static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
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@ -119,7 +119,7 @@ static int vxcan_get_iflink(const struct net_device *dev)
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rcu_read_lock();
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peer = rcu_dereference(priv->peer);
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iflink = peer ? peer->ifindex : 0;
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iflink = peer ? READ_ONCE(peer->ifindex) : 0;
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rcu_read_unlock();
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return iflink;
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@ -98,7 +98,7 @@ static int rmnet_vnd_get_iflink(const struct net_device *dev)
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{
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struct rmnet_priv *priv = netdev_priv(dev);
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return priv->real_dev->ifindex;
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return READ_ONCE(priv->real_dev->ifindex);
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}
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static int rmnet_vnd_init(struct net_device *dev)
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@ -349,7 +349,7 @@ static int ipvlan_get_iflink(const struct net_device *dev)
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{
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struct ipvl_dev *ipvlan = netdev_priv(dev);
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return ipvlan->phy_dev->ifindex;
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return READ_ONCE(ipvlan->phy_dev->ifindex);
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}
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static const struct net_device_ops ipvlan_netdev_ops = {
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@ -3753,7 +3753,7 @@ static void macsec_get_stats64(struct net_device *dev,
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static int macsec_get_iflink(const struct net_device *dev)
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{
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return macsec_priv(dev)->real_dev->ifindex;
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return READ_ONCE(macsec_priv(dev)->real_dev->ifindex);
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}
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static const struct net_device_ops macsec_netdev_ops = {
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@ -1158,7 +1158,7 @@ static int macvlan_dev_get_iflink(const struct net_device *dev)
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{
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struct macvlan_dev *vlan = netdev_priv(dev);
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return vlan->lowerdev->ifindex;
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return READ_ONCE(vlan->lowerdev->ifindex);
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}
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static const struct ethtool_ops macvlan_ethtool_ops = {
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@ -145,7 +145,7 @@ static int netkit_get_iflink(const struct net_device *dev)
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rcu_read_lock();
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peer = rcu_dereference(nk->peer);
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if (peer)
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iflink = peer->ifindex;
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iflink = READ_ONCE(peer->ifindex);
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rcu_read_unlock();
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return iflink;
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}
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@ -1461,7 +1461,7 @@ static int veth_get_iflink(const struct net_device *dev)
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rcu_read_lock();
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peer = rcu_dereference(priv->peer);
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iflink = peer ? peer->ifindex : 0;
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iflink = peer ? READ_ONCE(peer->ifindex) : 0;
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rcu_read_unlock();
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return iflink;
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@ -453,7 +453,7 @@ static int virt_wifi_net_device_get_iflink(const struct net_device *dev)
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{
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struct virt_wifi_netdev_priv *priv = netdev_priv(dev);
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return priv->lowerdev->ifindex;
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return READ_ONCE(priv->lowerdev->ifindex);
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}
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static const struct net_device_ops virt_wifi_ops = {
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@ -762,9 +762,9 @@ static void vlan_dev_netpoll_cleanup(struct net_device *dev)
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static int vlan_dev_get_iflink(const struct net_device *dev)
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{
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struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
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const struct net_device *real_dev = vlan_dev_priv(dev)->real_dev;
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return real_dev->ifindex;
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return READ_ONCE(real_dev->ifindex);
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}
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static int vlan_dev_fill_forward_path(struct net_device_path_ctx *ctx,
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@ -641,7 +641,7 @@ int dev_get_iflink(const struct net_device *dev)
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if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
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return dev->netdev_ops->ndo_get_iflink(dev);
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return dev->ifindex;
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return READ_ONCE(dev->ifindex);
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}
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EXPORT_SYMBOL(dev_get_iflink);
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@ -1611,10 +1611,10 @@ static int put_master_ifindex(struct sk_buff *skb, struct net_device *dev)
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static int nla_put_iflink(struct sk_buff *skb, const struct net_device *dev,
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bool force)
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{
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int ifindex = dev_get_iflink(dev);
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int iflink = dev_get_iflink(dev);
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if (force || dev->ifindex != ifindex)
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return nla_put_u32(skb, IFLA_LINK, ifindex);
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if (force || READ_ONCE(dev->ifindex) != iflink)
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return nla_put_u32(skb, IFLA_LINK, iflink);
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return 0;
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}
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@ -352,7 +352,7 @@ void dsa_user_mii_bus_init(struct dsa_switch *ds)
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/* user device handling ****************************************************/
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static int dsa_user_get_iflink(const struct net_device *dev)
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{
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return dsa_user_to_conduit(dev)->ifindex;
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return READ_ONCE(dsa_user_to_conduit(dev)->ifindex);
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}
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static int dsa_user_open(struct net_device *dev)
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@ -93,7 +93,7 @@ static int lowpan_neigh_construct(struct net_device *dev, struct neighbour *n)
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static int lowpan_get_iflink(const struct net_device *dev)
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{
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return lowpan_802154_dev(dev)->wdev->ifindex;
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return READ_ONCE(lowpan_802154_dev(dev)->wdev->ifindex);
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}
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static const struct net_device_ops lowpan_netdev_ops = {
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@ -1756,7 +1756,7 @@ int ip6_tnl_get_iflink(const struct net_device *dev)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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return t->parms.link;
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return READ_ONCE(t->parms.link);
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}
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EXPORT_SYMBOL(ip6_tnl_get_iflink);
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@ -727,7 +727,7 @@ static int xfrmi_get_iflink(const struct net_device *dev)
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{
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struct xfrm_if *xi = netdev_priv(dev);
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return xi->p.link;
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return READ_ONCE(xi->p.link);
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}
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static const struct net_device_ops xfrmi_netdev_ops = {
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