[RTNETLINK]: rtnl_link: allow specifying initial device address

Drivers need to validate the initial addresses in their netlink attribute
validation function or manually reject them if they can't support this.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 44 insertions, 4 deletions

diff --git a/drivers/net/dummy.c b/drivers/net/dummy.c
index 373ff700404f..756a6bcb038d 100644
--- a/drivers/net/dummy.c
+++ b/drivers/net/dummy.c
@@ -84,9 +84,21 @@ static int dummy_xmit(struct sk_buff *skb, struct net_device *dev)
         return 0;
 }
 
+static int dummy_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+        if (tb[IFLA_ADDRESS]) {
+                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+                        return -EINVAL;
+                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+                        return -EADDRNOTAVAIL;
+        }
+        return 0;
+}
+
 static struct rtnl_link_ops dummy_link_ops __read_mostly = {
         .kind           = "dummy",
         .setup          = dummy_setup,
+        .validate       = dummy_validate,
 };
 
 /* Number of dummy devices to be set up by this module. */
diff --git a/drivers/net/ifb.c b/drivers/net/ifb.c
index c8e7c8f6ba3e..f5c3598e59af 100644
--- a/drivers/net/ifb.c
+++ b/drivers/net/ifb.c
@@ -221,10 +221,22 @@ static int ifb_open(struct net_device *dev)
         return 0;
 }
 
+static int ifb_validate(struct nlattr *tb[], struct nlattr *data[])
+{
+        if (tb[IFLA_ADDRESS]) {
+                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+                        return -EINVAL;
+                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+                        return -EADDRNOTAVAIL;
+        }
+        return 0;
+}
+
 static struct rtnl_link_ops ifb_link_ops __read_mostly = {
         .kind           = "ifb",
         .priv_size      = sizeof(struct ifb_private),
         .setup          = ifb_setup,
+        .validate       = ifb_validate,
 };
 
 /* Number of ifb devices to be set up by this module. */
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 34c1d0b241ca..abb9900edb3f 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -324,8 +324,10 @@ static int vlan_dev_init(struct net_device *dev)
                                           (1<<__LINK_STATE_DORMANT))) |
                       (1<<__LINK_STATE_PRESENT);
 
-        memcpy(dev->broadcast, real_dev->broadcast, real_dev->addr_len);
-        memcpy(dev->dev_addr, real_dev->dev_addr, real_dev->addr_len);
+        if (is_zero_ether_addr(dev->dev_addr))
+                memcpy(dev->dev_addr, real_dev->dev_addr, dev->addr_len);
+        if (is_zero_ether_addr(dev->broadcast))
+                memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
 
         if (real_dev->features & NETIF_F_HW_VLAN_TX) {
                 dev->hard_header     = real_dev->hard_header;
@@ -373,6 +375,8 @@ void vlan_setup(struct net_device *new_dev)
         new_dev->set_multicast_list = vlan_dev_set_multicast_list;
         new_dev->destructor = free_netdev;
         new_dev->do_ioctl = vlan_dev_ioctl;
+
+        memset(new_dev->broadcast, 0, sizeof(ETH_ALEN));
 }
 
 static void vlan_transfer_operstate(const struct net_device *dev, struct net_device *vlandev)
diff --git a/net/8021q/vlan_netlink.c b/net/8021q/vlan_netlink.c
index 844c7e43d0fa..6cdd1e015e2d 100644
--- a/net/8021q/vlan_netlink.c
+++ b/net/8021q/vlan_netlink.c
@@ -41,6 +41,13 @@ static int vlan_validate(struct nlattr *tb[], struct nlattr *data[])
         u16 id;
         int err;
 
+        if (tb[IFLA_ADDRESS]) {
+                if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
+                        return -EINVAL;
+                if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
+                        return -EADDRNOTAVAIL;
+        }
+
         if (!data)
                 return -EINVAL;
 
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 7b6b16396745..864cbdf31ed7 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1032,8 +1032,7 @@ replay:
 
                 if (ifm->ifi_index || ifm->ifi_flags || ifm->ifi_change)
                         return -EOPNOTSUPP;
-                if (tb[IFLA_ADDRESS] || tb[IFLA_BROADCAST] || tb[IFLA_MAP] ||
-                    tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
+                if (tb[IFLA_MAP] || tb[IFLA_MASTER] || tb[IFLA_PROTINFO])
                         return -EOPNOTSUPP;
 
                 if (!ops) {
@@ -1065,6 +1064,12 @@ replay:
 
                 if (tb[IFLA_MTU])
                         dev->mtu = nla_get_u32(tb[IFLA_MTU]);
+                if (tb[IFLA_ADDRESS])
+                        memcpy(dev->dev_addr, nla_data(tb[IFLA_ADDRESS]),
+                               nla_len(tb[IFLA_ADDRESS]));
+                if (tb[IFLA_BROADCAST])
+                        memcpy(dev->broadcast, nla_data(tb[IFLA_BROADCAST]),
+                               nla_len(tb[IFLA_BROADCAST]));
                 if (tb[IFLA_TXQLEN])
                         dev->tx_queue_len = nla_get_u32(tb[IFLA_TXQLEN]);
                 if (tb[IFLA_WEIGHT])