Originally by Johannes Berg. This patch adds support for devices that do not
report their MAC address until the firmware is loaded. While the address is not
known, a multicast on is used.
Signed-off-by: Luis Carlos Cobo <[email protected]>
---
net/mac80211/main.c | 38 ++++++++++++++++++++++++++++++++++++++
1 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/net/mac80211/main.c b/net/mac80211/main.c
index aa5a191..5a70583 100644
--- a/net/mac80211/main.c
+++ b/net/mac80211/main.c
@@ -187,9 +187,15 @@ static int ieee80211_open(struct net_device *dev)
u32 changed = 0;
int res;
bool need_hw_reconfig = 0;
+ u8 null_addr[ETH_ALEN] = {0};
sdata = IEEE80211_DEV_TO_SUB_IF(dev);
+ /* fail early if user set an invalid address */
+ if (compare_ether_addr(dev->dev_addr, null_addr) &&
+ !is_valid_ether_addr(dev->dev_addr))
+ return -EADDRNOTAVAIL;
+
/* we hold the RTNL here so can safely walk the list */
list_for_each_entry(nsdata, &local->interfaces, list) {
struct net_device *ndev = nsdata->dev;
@@ -270,6 +276,36 @@ static int ieee80211_open(struct net_device *dev)
ieee80211_led_radio(local, local->hw.conf.radio_enabled);
}
+ /*
+ * Check all interfaces and copy the hopefully now-present
+ * MAC address to those that have the special null one.
+ */
+ list_for_each_entry(nsdata, &local->interfaces, list) {
+ struct net_device *ndev = nsdata->dev;
+
+ /*
+ * No need to check netif_running since we do not allow
+ * it to start up with this invalid address.
+ */
+ if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
+ memcpy(ndev->dev_addr,
+ local->hw.wiphy->perm_addr,
+ ETH_ALEN);
+ }
+
+ if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
+ memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
+ ETH_ALEN);
+
+ /*
+ * Validate the MAC address for this device.
+ */
+ if (!is_valid_ether_addr(dev->dev_addr)) {
+ if (!local->open_count && local->ops->stop)
+ local->ops->stop(local_to_hw(local));
+ return -EADDRNOTAVAIL;
+ }
+
switch (sdata->vif.type) {
case IEEE80211_IF_TYPE_VLAN:
/* no need to tell driver */
@@ -975,6 +1011,8 @@ void ieee80211_if_setup(struct net_device *dev)
dev->open = ieee80211_open;
dev->stop = ieee80211_stop;
dev->destructor = free_netdev;
+ /* we will validate the address ourselves in ->open */
+ dev->validate_addr = NULL;
}
/* everything else */
--
1.5.4.3