veth: Showing peer of veth type dev in ip link (kernel side)

ip link has ability to show extra information of net work device if
kernel provides sunh information. With this patch veth driver can
provide its peer ifindex information to ip command via netlink
interface.

Signed-off-by: Masatake YAMATO <yamato@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/veth.c b/drivers/net/veth.c
index eee1f19ef1e9397469e343133490ec6972b4bbdc..54187b9c0efc2508a6fc88b3d89fa699568e78b3 100644 (file)
--- a/drivers/net/veth.c
+++ b/drivers/net/veth.c
@@ -434,6 +434,25 @@ static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
        [VETH_INFO_PEER]        = { .len = sizeof(struct ifinfomsg) },
 };
 
+static size_t veth_get_size(const struct net_device *dev)
+{
+       return nla_total_size(sizeof(u64)) + /* VETH_INFO_PEER */
+               0;
+}
+
+static int veth_fill_info(struct sk_buff *skb, const struct net_device *dev)
+{
+       struct veth_priv *priv = netdev_priv(dev);
+       struct net_device *peer = rtnl_dereference(priv->peer);
+       u64 peer_ifindex;
+
+       peer_ifindex = peer ? peer->ifindex : 0;
+       if (nla_put_u64(skb, VETH_INFO_PEER, peer_ifindex))
+               return -EMSGSIZE;
+
+       return 0;
+}
+
 static struct rtnl_link_ops veth_link_ops = {
        .kind           = DRV_NAME,
        .priv_size      = sizeof(struct veth_priv),
@@ -443,6 +462,8 @@ static struct rtnl_link_ops veth_link_ops = {
        .dellink        = veth_dellink,
        .policy         = veth_policy,
        .maxtype        = VETH_INFO_MAX,
+       .get_size       = veth_get_size,
+       .fill_info      = veth_fill_info,
 };
 
 /*