[VLAN]: Make sure bonding packet drop checks get done in hwaccel RX path.

Since __vlan_hwaccel_rx() is essentially bypassing the
netif_receive_skb() call that would have occurred if we did the VLAN
decapsulation in software, we are missing the skb_bond() call and the
assosciated checks it does.

Export those checks via an inline function, skb_bond_should_drop(),
and use this in __vlan_hwaccel_rx().

Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 29 insertions, 0 deletions

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 383627ad328f..ab2740832742 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -155,6 +155,11 @@ static inline int __vlan_hwaccel_rx(struct sk_buff *skb,
 {
         struct net_device_stats *stats;
 
+        if (skb_bond_should_drop(skb)) {
+                dev_kfree_skb_any(skb);
+                return NET_RX_DROP;
+        }
+
         skb->dev = grp->vlan_devices[vlan_tag & VLAN_VID_MASK];
         if (skb->dev == NULL) {
                 dev_kfree_skb_any(skb);
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 75f02d8c6ed3..c0c2b46face1 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -1012,6 +1012,30 @@ static inline int netif_needs_gso(struct net_device *dev, struct sk_buff *skb)
                 unlikely(skb->ip_summed != CHECKSUM_HW));
 }
 
+/* On bonding slaves other than the currently active slave, suppress
+ * duplicates except for 802.3ad ETH_P_SLOW and alb non-mcast/bcast.
+ */
+static inline int skb_bond_should_drop(struct sk_buff *skb)
+{
+        struct net_device *dev = skb->dev;
+        struct net_device *master = dev->master;
+
+        if (master &&
+            (dev->priv_flags & IFF_SLAVE_INACTIVE)) {
+                if (master->priv_flags & IFF_MASTER_ALB) {
+                        if (skb->pkt_type != PACKET_BROADCAST &&
+                            skb->pkt_type != PACKET_MULTICAST)
+                                return 0;
+                }
+                if (master->priv_flags & IFF_MASTER_8023AD &&
+                    skb->protocol == __constant_htons(ETH_P_SLOW))
+                        return 0;
+
+                return 1;
+        }
+        return 0;
+}
+
 #endif /* __KERNEL__ */
 
 #endif  /* _LINUX_DEV_H */