bridge: fdb dumping takes a filter device

Dumping a bridge fdb dumps every fdb entry
held. With this change we are going to filter
on selected bridge port.

Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -7095,13 +7095,14 @@ static int i40e_ndo_fdb_del(struct ndmsg *ndm,
 static int i40e_ndo_fdb_dump(struct sk_buff *skb,
 			     struct netlink_callback *cb,
 			     struct net_device *dev,
+			     struct net_device *filter_dev,
 			     int idx)
 {
 	struct i40e_netdev_priv *np = netdev_priv(dev);
 	struct i40e_pf *pf = np->vsi->back;
 
 	if (pf->flags & I40E_FLAG_SRIOV_ENABLED)
-		idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
+		idx = ndo_dflt_fdb_dump(skb, cb, dev, filter_dev, idx);
 
 	return idx;
 }

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

@@ -427,16 +427,17 @@ static int qlcnic_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
 }
 
 static int qlcnic_fdb_dump(struct sk_buff *skb, struct netlink_callback *ncb,
-			struct net_device *netdev, int idx)
+			struct net_device *netdev,
+			struct net_device *filter_dev, int idx)
 {
 	struct qlcnic_adapter *adapter = netdev_priv(netdev);
 
 	if (!adapter->fdb_mac_learn)
-		return ndo_dflt_fdb_dump(skb, ncb, netdev, idx);
+		return ndo_dflt_fdb_dump(skb, ncb, netdev, filter_dev, idx);
 
 	if ((adapter->flags & QLCNIC_ESWITCH_ENABLED) ||
 	    qlcnic_sriov_check(adapter))
-		idx = ndo_dflt_fdb_dump(skb, ncb, netdev, idx);
+		idx = ndo_dflt_fdb_dump(skb, ncb, netdev, filter_dev, idx);
 
 	return idx;
 }

drivers/net/vxlan.c

@@ -933,7 +933,8 @@ out:
 
 /* Dump forwarding table */
 static int vxlan_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
-			  struct net_device *dev, int idx)
+			  struct net_device *dev,
+			  struct net_device *filter_dev, int idx)
 {
 	struct vxlan_dev *vxlan = netdev_priv(dev);
 	unsigned int h;

include/linux/netdevice.h

@@ -943,7 +943,8 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
  *		      const unsigned char *addr)
  *	Deletes the FDB entry from dev coresponding to addr.
  * int (*ndo_fdb_dump)(struct sk_buff *skb, struct netlink_callback *cb,
- *		       struct net_device *dev, int idx)
+ *		       struct net_device *dev, struct net_device *filter_dev,
+ *		       int idx)
  *	Used to add FDB entries to dump requests. Implementers should add
  *	entries to skb and update idx with the number of entries.
  *
@@ -1114,6 +1115,7 @@ struct net_device_ops {
 	int			(*ndo_fdb_dump)(struct sk_buff *skb,
 						struct netlink_callback *cb,
 						struct net_device *dev,
+						struct net_device *filter_dev,
 						int idx);
 
 	int			(*ndo_bridge_setlink)(struct net_device *dev,

include/linux/rtnetlink.h

@@ -78,6 +78,7 @@ extern void __rtnl_unlock(void);
 extern int ndo_dflt_fdb_dump(struct sk_buff *skb,
 			     struct netlink_callback *cb,
 			     struct net_device *dev,
+			     struct net_device *filter_dev,
 			     int idx);
 extern int ndo_dflt_fdb_add(struct ndmsg *ndm,
 			    struct nlattr *tb[],

net/bridge/br_fdb.c

@@ -676,6 +676,7 @@ errout:
 int br_fdb_dump(struct sk_buff *skb,
 		struct netlink_callback *cb,
 		struct net_device *dev,
+		struct net_device *filter_dev,
 		int idx)
 {
 	struct net_bridge *br = netdev_priv(dev);
@@ -691,6 +692,10 @@ int br_fdb_dump(struct sk_buff *skb,
 			if (idx < cb->args[0])
 				goto skip;
 
+			if (filter_dev && (!f->dst || !f->dst->dev ||
+					   f->dst->dev != filter_dev))
+				goto skip;
+
 			if (fdb_fill_info(skb, br, f,
 					  NETLINK_CB(cb->skb).portid,
 					  cb->nlh->nlmsg_seq,

net/bridge/br_private.h

@@ -399,7 +399,7 @@ int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
 	       const unsigned char *addr, u16 nlh_flags);
 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
-		struct net_device *dev, int idx);
+		struct net_device *dev, struct net_device *fdev, int idx);
 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
 

net/core/rtnetlink.c

@@ -2517,6 +2517,7 @@ skip:
 int ndo_dflt_fdb_dump(struct sk_buff *skb,
 		      struct netlink_callback *cb,
 		      struct net_device *dev,
+		      struct net_device *filter_dev,
 		      int idx)
 {
 	int err;
@@ -2547,13 +2548,15 @@ static int rtnl_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb)
 			br_dev = netdev_master_upper_dev_get(dev);
 			ops = br_dev->netdev_ops;
 			if (ops->ndo_fdb_dump)
-				idx = ops->ndo_fdb_dump(skb, cb, dev, idx);
+				idx = ops->ndo_fdb_dump(skb, cb, dev, NULL,
+							idx);
 		}
 
 		if (dev->netdev_ops->ndo_fdb_dump)
-			idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, idx);
+			idx = dev->netdev_ops->ndo_fdb_dump(skb, cb, dev, NULL,
+							    idx);
 		else
-			idx = ndo_dflt_fdb_dump(skb, cb, dev, idx);
+			idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
 	}
 	rcu_read_unlock();