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authorPatrick McHardy <kaber@trash.net>2007-06-27 01:28:10 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-10 22:15:56 -0700
commit4417da668c0021903464f92db278ddae348e0299 (patch)
treea4330cbc2e69a5714fee0a04bcfbabe97109de46 /net/core/dev.c
parent3fba5a8b1e3df2384b90493538161e83cf15dd5f (diff)
[NET]: dev: secondary unicast address support
Add support for configuring secondary unicast addresses on network devices. To support this devices capable of filtering multiple unicast addresses need to change their set_multicast_list function to configure unicast filters as well and assign it to dev->set_rx_mode instead of dev->set_multicast_list. Other devices are put into promiscous mode when secondary unicast addresses are present. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c144
1 files changed, 127 insertions, 17 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 18759ccdf21..36e9bf8ec4a 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -942,7 +942,7 @@ int dev_open(struct net_device *dev)
/*
* Initialize multicasting status
*/
- dev_mc_upload(dev);
+ dev_set_rx_mode(dev);
/*
* Wakeup transmit queue engine
@@ -2498,17 +2498,7 @@ int netdev_set_master(struct net_device *slave, struct net_device *master)
return 0;
}
-/**
- * dev_set_promiscuity - update promiscuity count on a device
- * @dev: device
- * @inc: modifier
- *
- * Add or remove promiscuity from a device. While the count in the device
- * remains above zero the interface remains promiscuous. Once it hits zero
- * the device reverts back to normal filtering operation. A negative inc
- * value is used to drop promiscuity on the device.
- */
-void dev_set_promiscuity(struct net_device *dev, int inc)
+static void __dev_set_promiscuity(struct net_device *dev, int inc)
{
unsigned short old_flags = dev->flags;
@@ -2517,7 +2507,6 @@ void dev_set_promiscuity(struct net_device *dev, int inc)
else
dev->flags |= IFF_PROMISC;
if (dev->flags != old_flags) {
- dev_mc_upload(dev);
printk(KERN_INFO "device %s %s promiscuous mode\n",
dev->name, (dev->flags & IFF_PROMISC) ? "entered" :
"left");
@@ -2531,6 +2520,25 @@ void dev_set_promiscuity(struct net_device *dev, int inc)
}
/**
+ * dev_set_promiscuity - update promiscuity count on a device
+ * @dev: device
+ * @inc: modifier
+ *
+ * Add or remove promiscuity from a device. While the count in the device
+ * remains above zero the interface remains promiscuous. Once it hits zero
+ * the device reverts back to normal filtering operation. A negative inc
+ * value is used to drop promiscuity on the device.
+ */
+void dev_set_promiscuity(struct net_device *dev, int inc)
+{
+ unsigned short old_flags = dev->flags;
+
+ __dev_set_promiscuity(dev, inc);
+ if (dev->flags != old_flags)
+ dev_set_rx_mode(dev);
+}
+
+/**
* dev_set_allmulti - update allmulti count on a device
* @dev: device
* @inc: modifier
@@ -2550,7 +2558,48 @@ void dev_set_allmulti(struct net_device *dev, int inc)
if ((dev->allmulti += inc) == 0)
dev->flags &= ~IFF_ALLMULTI;
if (dev->flags ^ old_flags)
- dev_mc_upload(dev);
+ dev_set_rx_mode(dev);
+}
+
+/*
+ * Upload unicast and multicast address lists to device and
+ * configure RX filtering. When the device doesn't support unicast
+ * filtering it is put in promiscous mode while unicast addresses
+ * are present.
+ */
+void __dev_set_rx_mode(struct net_device *dev)
+{
+ /* dev_open will call this function so the list will stay sane. */
+ if (!(dev->flags&IFF_UP))
+ return;
+
+ if (!netif_device_present(dev))
+ return;
+
+ if (dev->set_rx_mode)
+ dev->set_rx_mode(dev);
+ else {
+ /* Unicast addresses changes may only happen under the rtnl,
+ * therefore calling __dev_set_promiscuity here is safe.
+ */
+ if (dev->uc_count > 0 && !dev->uc_promisc) {
+ __dev_set_promiscuity(dev, 1);
+ dev->uc_promisc = 1;
+ } else if (dev->uc_count == 0 && dev->uc_promisc) {
+ __dev_set_promiscuity(dev, -1);
+ dev->uc_promisc = 0;
+ }
+
+ if (dev->set_multicast_list)
+ dev->set_multicast_list(dev);
+ }
+}
+
+void dev_set_rx_mode(struct net_device *dev)
+{
+ netif_tx_lock_bh(dev);
+ __dev_set_rx_mode(dev);
+ netif_tx_unlock_bh(dev);
}
int __dev_addr_delete(struct dev_addr_list **list, void *addr, int alen,
@@ -2622,6 +2671,66 @@ void __dev_addr_discard(struct dev_addr_list **list)
}
}
+/**
+ * dev_unicast_delete - Release secondary unicast address.
+ * @dev: device
+ *
+ * Release reference to a secondary unicast address and remove it
+ * from the device if the reference count drop to zero.
+ *
+ * The caller must hold the rtnl_mutex.
+ */
+int dev_unicast_delete(struct net_device *dev, void *addr, int alen)
+{
+ int err;
+
+ ASSERT_RTNL();
+
+ netif_tx_lock_bh(dev);
+ err = __dev_addr_delete(&dev->uc_list, addr, alen, 0);
+ if (!err) {
+ dev->uc_count--;
+ __dev_set_rx_mode(dev);
+ }
+ netif_tx_unlock_bh(dev);
+ return err;
+}
+EXPORT_SYMBOL(dev_unicast_delete);
+
+/**
+ * dev_unicast_add - add a secondary unicast address
+ * @dev: device
+ *
+ * Add a secondary unicast address to the device or increase
+ * the reference count if it already exists.
+ *
+ * The caller must hold the rtnl_mutex.
+ */
+int dev_unicast_add(struct net_device *dev, void *addr, int alen)
+{
+ int err;
+
+ ASSERT_RTNL();
+
+ netif_tx_lock_bh(dev);
+ err = __dev_addr_add(&dev->uc_list, addr, alen, 0);
+ if (!err) {
+ dev->uc_count++;
+ __dev_set_rx_mode(dev);
+ }
+ netif_tx_unlock_bh(dev);
+ return err;
+}
+EXPORT_SYMBOL(dev_unicast_add);
+
+static void dev_unicast_discard(struct net_device *dev)
+{
+ netif_tx_lock_bh(dev);
+ __dev_addr_discard(&dev->uc_list);
+ dev->uc_count = 0;
+ netif_tx_unlock_bh(dev);
+}
+
unsigned dev_get_flags(const struct net_device *dev)
{
unsigned flags;
@@ -2665,7 +2774,7 @@ int dev_change_flags(struct net_device *dev, unsigned flags)
* Load in the correct multicast list now the flags have changed.
*/
- dev_mc_upload(dev);
+ dev_set_rx_mode(dev);
/*
* Have we downed the interface. We handle IFF_UP ourselves
@@ -2678,7 +2787,7 @@ int dev_change_flags(struct net_device *dev, unsigned flags)
ret = ((old_flags & IFF_UP) ? dev_close : dev_open)(dev);
if (!ret)
- dev_mc_upload(dev);
+ dev_set_rx_mode(dev);
}
if (dev->flags & IFF_UP &&
@@ -3558,8 +3667,9 @@ void unregister_netdevice(struct net_device *dev)
raw_notifier_call_chain(&netdev_chain, NETDEV_UNREGISTER, dev);
/*
- * Flush the multicast chain
+ * Flush the unicast and multicast chains
*/
+ dev_unicast_discard(dev);
dev_mc_discard(dev);
if (dev->uninit)