1 files changed, 55 insertions, 2 deletions

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index f264ff162979..8032126fd589 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4241,6 +4241,43 @@ out:
         return 0;
 }
 
+static void bond_activebackup_xmit_copy(struct sk_buff *skb,
+                                        struct bonding *bond,
+                                        struct slave *slave)
+{
+        struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
+        struct ethhdr *eth_data;
+        u8 *hwaddr;
+        int res;
+
+        if (!skb2) {
+                printk(KERN_ERR DRV_NAME ": Error: "
+                       "bond_activebackup_xmit_copy(): skb_copy() failed\n");
+                return;
+        }
+
+        skb2->mac.raw = (unsigned char *)skb2->data;
+        eth_data = eth_hdr(skb2);
+
+        /* Pick an appropriate source MAC address
+         *      -- use slave's perm MAC addr, unless used by bond
+         *      -- otherwise, borrow active slave's perm MAC addr
+         *         since that will not be used
+         */
+        hwaddr = slave->perm_hwaddr;
+        if (!memcmp(eth_data->h_source, hwaddr, ETH_ALEN))
+                hwaddr = bond->curr_active_slave->perm_hwaddr;
+
+        /* Set source MAC address appropriately */
+        memcpy(eth_data->h_source, hwaddr, ETH_ALEN);
+
+        res = bond_dev_queue_xmit(bond, skb2, slave->dev);
+        if (res)
+                dev_kfree_skb(skb2);
+
+        return;
+}
+
 /*
  * in active-backup mode, we know that bond->curr_active_slave is always valid if
  * the bond has a usable interface.
@@ -4257,10 +4294,26 @@ static int bond_xmit_activebackup(struct sk_buff *skb, struct net_device *bond_d
                 goto out;
         }
 
-        if (bond->curr_active_slave) { /* one usable interface */
-                res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
+        if (!bond->curr_active_slave)
+                goto out;
+
+        /* Xmit IGMP frames on all slaves to ensure rapid fail-over
+           for multicast traffic on snooping switches */
+        if (skb->protocol == __constant_htons(ETH_P_IP) &&
+            skb->nh.iph->protocol == IPPROTO_IGMP) {
+                struct slave *slave, *active_slave;
+                int i;
+
+                active_slave = bond->curr_active_slave;
+                bond_for_each_slave_from_to(bond, slave, i, active_slave->next,
+                                            active_slave->prev)
+                        if (IS_UP(slave->dev) &&
+                            (slave->link == BOND_LINK_UP))
+                                bond_activebackup_xmit_copy(skb, bond, slave);
         }
 
+        res = bond_dev_queue_xmit(bond, skb, bond->curr_active_slave->dev);
+
 out:
         if (res) {
                 /* no suitable interface, frame not sent */