int __dev_addr_sync(struct dev_addr_list **to, int *to_count,
struct dev_addr_list **from, int *from_count)
{
struct dev_addr_list *da, *next;
int err = 0;
da = *from;
while (da != NULL) {
next = da->next;
if (!da->da_synced) {
err = __dev_addr_add(to, to_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, to_count,
da->da_addr, da->da_addrlen, 0);
__dev_addr_delete(from, from_count,
da->da_addr, da->da_addrlen, 0);
}
da = next;
}
return err;
}
/**
* 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;
}
int dev_mc_add(struct net_device *dev, void *addr, int alen, int glbl)
{
int err;
netif_tx_lock_bh(dev);
err = __dev_addr_add(&dev->mc_list, &dev->mc_count, addr, alen, glbl);
if (!err)
__dev_set_rx_mode(dev);
netif_tx_unlock_bh(dev);
return err;
}
/**
* 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, *da_to;
int err = 0;
netif_tx_lock_bh(to);
da = from->mc_list;
while (da != NULL) {
int synced = 0;
next = da->next;
da_to = to->mc_list;
/* 2.6.22 does not have da->da_synced so lets take the long route */
while (da_to != NULL) {
if (memcmp(da_to->da_addr, da->da_addr, da_to->da_addrlen) == 0 &&
da->da_addrlen == da_to->da_addrlen)
synced = 1;
break;
}
if (!synced) {
err = __dev_addr_add(&to->mc_list, &to->mc_count,
da->da_addr, da->da_addrlen, 0);
if (err < 0)
break;
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;
}
