netdev - [PATCH net 1/2] bonding:delete rlb entry if bond's ip is deleted

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Message-Id: <a63c50701cc26f4cba7867513adfe6803092b038.1332386801.git.panweiping3@gmail.com>
Date:	Thu, 22 Mar 2012 16:18:31 +0800
From:	Weiping Pan <panweiping3@...il.com>
To:	unlisted-recipients:; (no To-header on input)
Cc:	Weiping Pan <panweiping3@...il.com>,
	Jay Vosburgh <fubar@...ibm.com> (supporter:BONDING DRIVER),
	Andy Gospodarek <andy@...yhouse.net> (supporter:BONDING DRIVER),
	netdev@...r.kernel.org (open list:BONDING DRIVER),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net 1/2] bonding:delete rlb entry if bond's ip is deleted

When the ip of bonding is deleted, its rlb table still contains old invalid
mappings, just delete them to avoid poisoning other clients arp cache.

Signed-off-by: Weiping Pan <panweiping3@...il.com>
---
 drivers/net/bonding/bond_alb.c  |   35 +++++++++++++++++++++++++++++++++++
 drivers/net/bonding/bond_alb.h  |    2 ++
 drivers/net/bonding/bond_main.c |    1 +
 3 files changed, 38 insertions(+), 0 deletions(-)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index f820b26..bca1039 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -853,6 +853,41 @@ static void rlb_clear_vlan(struct bonding *bond, unsigned short vlan_id)
 	_unlock_rx_hashtbl_bh(bond);
 }
 
+/* delete all rlb entries whose ip_src equals ip */
+void bond_alb_delete_entry(struct bonding *bond, __be32 ip)
+{
+	struct alb_bond_info *bond_info = &(BOND_ALB_INFO(bond));
+	u32 curr_index;
+
+	_lock_rx_hashtbl_bh(bond);
+
+	curr_index = bond_info->rx_hashtbl_head;
+	while (curr_index != RLB_NULL_INDEX) {
+		struct rlb_client_info *curr = &(bond_info->rx_hashtbl[curr_index]);
+		u32 next_index = bond_info->rx_hashtbl[curr_index].next;
+		u32 prev_index = bond_info->rx_hashtbl[curr_index].prev;
+		if (curr->assigned && (curr->ip_src == ip)) {
+			if (curr_index == bond_info->rx_hashtbl_head) {
+				bond_info->rx_hashtbl_head = next_index;
+			}
+
+			if (prev_index != RLB_NULL_INDEX) {
+				bond_info->rx_hashtbl[prev_index].next = next_index;
+			}
+
+			if (next_index != RLB_NULL_INDEX) {
+				bond_info->rx_hashtbl[next_index].prev = prev_index;
+			}
+
+			rlb_init_table_entry(curr);
+		}
+
+		curr_index = next_index;
+	}
+
+	_unlock_rx_hashtbl_bh(bond);
+}
+
 /*********************** tlb/rlb shared functions *********************/
 
 static void alb_send_learning_packets(struct slave *slave, u8 mac_addr[])
diff --git a/drivers/net/bonding/bond_alb.h b/drivers/net/bonding/bond_alb.h
index 90f140a..38863fc 100644
--- a/drivers/net/bonding/bond_alb.h
+++ b/drivers/net/bonding/bond_alb.h
@@ -163,5 +163,7 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev);
 void bond_alb_monitor(struct work_struct *);
 int bond_alb_set_mac_address(struct net_device *bond_dev, void *addr);
 void bond_alb_clear_vlan(struct bonding *bond, unsigned short vlan_id);
+
+void bond_alb_delete_entry(struct bonding *bond, __be32 ip);
 #endif /* __BOND_ALB_H__ */
 
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 435984a..ec071b9 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -3315,6 +3315,7 @@ static int bond_inetaddr_event(struct notifier_block *this, unsigned long event,
 				return NOTIFY_OK;
 			case NETDEV_DOWN:
 				bond->master_ip = 0;
+				bond_alb_delete_entry(bond, ifa->ifa_local);
 				return NOTIFY_OK;
 			default:
 				return NOTIFY_DONE;
-- 
1.7.4

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