#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/init.h>
+#include <net/net_namespace.h>
#include <net/ip.h>
#include <net/route.h>
#include <linux/skbuff.h>
return err;
}
-/*
- * Discard multicast list when a device is downed
+/**
+ * dev_mc_sync - Synchronize device's multicast list to another device
+ * @to: destination device
+ * @from: source device
+ *
+ * Add newly added addresses to the destination device and release
+ * addresses that have no users left. The source device must be
+ * locked by netif_tx_lock_bh.
+ *
+ * This function is intended to be called from the dev->set_multicast_list
+ * function of layered software devices.
*/
+int dev_mc_sync(struct net_device *to, struct net_device *from)
+{
+ struct dev_addr_list *da, *next;
+ int err = 0;
+
+ netif_tx_lock_bh(to);
+ da = from->mc_list;
+ while (da != NULL) {
+ next = da->next;
+ if (!da->da_synced) {
+ err = __dev_addr_add(&to->mc_list, &to->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ if (err < 0)
+ break;
+ da->da_synced = 1;
+ da->da_users++;
+ } else if (da->da_users == 1) {
+ __dev_addr_delete(&to->mc_list, &to->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ __dev_addr_delete(&from->mc_list, &from->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ }
+ da = next;
+ }
+ if (!err)
+ __dev_set_rx_mode(to);
+ netif_tx_unlock_bh(to);
+
+ return err;
+}
+EXPORT_SYMBOL(dev_mc_sync);
-void dev_mc_discard(struct net_device *dev)
+
+/**
+ * dev_mc_unsync - Remove synchronized addresses from the destination
+ * device
+ * @to: destination device
+ * @from: source device
+ *
+ * Remove all addresses that were added to the destination device by
+ * dev_mc_sync(). This function is intended to be called from the
+ * dev->stop function of layered software devices.
+ */
+void dev_mc_unsync(struct net_device *to, struct net_device *from)
{
- netif_tx_lock_bh(dev);
- __dev_addr_discard(&dev->mc_list);
- dev->mc_count = 0;
- netif_tx_unlock_bh(dev);
+ struct dev_addr_list *da, *next;
+
+ netif_tx_lock_bh(from);
+ netif_tx_lock_bh(to);
+
+ da = from->mc_list;
+ while (da != NULL) {
+ next = da->next;
+ if (!da->da_synced)
+ continue;
+ __dev_addr_delete(&to->mc_list, &to->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ da->da_synced = 0;
+ __dev_addr_delete(&from->mc_list, &from->mc_count,
+ da->da_addr, da->da_addrlen, 0);
+ da = next;
+ }
+ __dev_set_rx_mode(to);
+
+ netif_tx_unlock_bh(to);
+ netif_tx_unlock_bh(from);
}
+EXPORT_SYMBOL(dev_mc_unsync);
#ifdef CONFIG_PROC_FS
static void *dev_mc_seq_start(struct seq_file *seq, loff_t *pos)
{
+ struct net *net = seq->private;
struct net_device *dev;
loff_t off = 0;
read_lock(&dev_base_lock);
- for_each_netdev(dev) {
+ for_each_netdev(net, dev) {
if (off++ == *pos)
return dev;
}
static int dev_mc_seq_open(struct inode *inode, struct file *file)
{
- return seq_open(file, &dev_mc_seq_ops);
+ struct seq_file *seq;
+ int res;
+ res = seq_open(file, &dev_mc_seq_ops);
+ if (!res) {
+ seq = file->private_data;
+ seq->private = get_proc_net(inode);
+ if (!seq->private) {
+ seq_release(inode, file);
+ res = -ENXIO;
+ }
+ }
+ return res;
+}
+
+static int dev_mc_seq_release(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq = file->private_data;
+ struct net *net = seq->private;
+ put_net(net);
+ return seq_release(inode, file);
}
static const struct file_operations dev_mc_seq_fops = {
.open = dev_mc_seq_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release,
+ .release = dev_mc_seq_release,
};
#endif
+static int dev_mc_net_init(struct net *net)
+{
+ if (!proc_net_fops_create(net, "dev_mcast", 0, &dev_mc_seq_fops))
+ return -ENOMEM;
+ return 0;
+}
+
+static void dev_mc_net_exit(struct net *net)
+{
+ proc_net_remove(net, "dev_mcast");
+}
+
+static struct pernet_operations dev_mc_net_ops = {
+ .init = dev_mc_net_init,
+ .exit = dev_mc_net_exit,
+};
+
void __init dev_mcast_init(void)
{
- proc_net_fops_create("dev_mcast", 0, &dev_mc_seq_fops);
+ register_pernet_subsys(&dev_mc_net_ops);
}
EXPORT_SYMBOL(dev_mc_add);