Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm

[cascardo/linux.git] / net / l3mdev / l3mdev.c

diff --git a/net/l3mdev/l3mdev.c b/net/l3mdev/l3mdev.c
index e925037..6651a78 100644 (file)
--- a/net/l3mdev/l3mdev.c
+++ b/net/l3mdev/l3mdev.c
@@ -97,3 +97,66 @@ u32 l3mdev_fib_table_by_index(struct net *net, int ifindex)
        return tb_id;
 }
 EXPORT_SYMBOL_GPL(l3mdev_fib_table_by_index);
+
+/**
+ *     l3mdev_get_rt6_dst - IPv6 route lookup based on flow. Returns
+ *                          cached route for L3 master device if relevant
+ *                          to flow
+ *     @net: network namespace for device index lookup
+ *     @fl6: IPv6 flow struct for lookup
+ */
+
+struct dst_entry *l3mdev_get_rt6_dst(struct net *net,
+                                    const struct flowi6 *fl6)
+{
+       struct dst_entry *dst = NULL;
+       struct net_device *dev;
+
+       if (fl6->flowi6_oif) {
+               rcu_read_lock();
+
+               dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
+               if (dev && netif_is_l3_slave(dev))
+                       dev = netdev_master_upper_dev_get_rcu(dev);
+
+               if (dev && netif_is_l3_master(dev) &&
+                   dev->l3mdev_ops->l3mdev_get_rt6_dst)
+                       dst = dev->l3mdev_ops->l3mdev_get_rt6_dst(dev, fl6);
+
+               rcu_read_unlock();
+       }
+
+       return dst;
+}
+EXPORT_SYMBOL_GPL(l3mdev_get_rt6_dst);
+
+/**
+ *     l3mdev_get_saddr - get source address for a flow based on an interface
+ *                        enslaved to an L3 master device
+ *     @net: network namespace for device index lookup
+ *     @ifindex: Interface index
+ *     @fl4: IPv4 flow struct
+ */
+
+int l3mdev_get_saddr(struct net *net, int ifindex, struct flowi4 *fl4)
+{
+       struct net_device *dev;
+       int rc = 0;
+
+       if (ifindex) {
+               rcu_read_lock();
+
+               dev = dev_get_by_index_rcu(net, ifindex);
+               if (dev && netif_is_l3_slave(dev))
+                       dev = netdev_master_upper_dev_get_rcu(dev);
+
+               if (dev && netif_is_l3_master(dev) &&
+                   dev->l3mdev_ops->l3mdev_get_saddr)
+                       rc = dev->l3mdev_ops->l3mdev_get_saddr(dev, fl4);
+
+               rcu_read_unlock();
+       }
+
+       return rc;
+}
+EXPORT_SYMBOL_GPL(l3mdev_get_saddr);