linux-kernel - [PATCH] bonding: rlb mode of bond should not alter ARP replies originating via bridge

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Message-Id: <1352258580-8272-1-git-send-email-zheng.x.li@oracle.com>
Date:	Wed,  7 Nov 2012 11:23:00 +0800
From:	Zheng Li <zheng.x.li@...cle.com>
To:	netdev@...r.kernel.org, fubar@...ibm.com, andy@...yhouse.net
Cc:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	joe.jin@...cle.com, zheng.x.li@...cle.com
Subject: [PATCH] bonding: rlb mode of bond should not alter ARP replies originating via bridge

ARP traffic passing through a bridge and out via the bond (when the bond is a 
port of the bridge) should not have its source MAC address adjusted by the 
receive load balance code in rlb_arp_xmit.

Signed-off-by: Zheng Li <zheng.x.li@...cle.com>
Cc: Jay Vosburgh <fubar@...ibm.com>
Cc: Andy Gospodarek <andy@...yhouse.net>
Cc: "David S. Miller" <davem@...emloft.net>

---
 drivers/net/bonding/bond_alb.c |   12 +++++++++++-
 1 files changed, 11 insertions(+), 1 deletions(-)

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index e15cc11..641b3f1 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -700,7 +700,17 @@ static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
 		*/
 		tx_slave = rlb_choose_channel(skb, bond);
 		if (tx_slave) {
-			memcpy(arp->mac_src,tx_slave->dev->dev_addr, ETH_ALEN);
+			struct slave *tmp_slave = NULL;
+			int i = 0;
+			bond_for_each_slave(bond, tmp_slave, i) {
+				if (ether_addr_equal_64bits(arp->mac_src,
+						tmp_slave->dev->dev_addr)) {
+					memcpy(arp->mac_src,
+						tx_slave->dev->dev_addr,
+						ETH_ALEN);
+					break;
+				}
+			}
 		}
 		pr_debug("Server sent ARP Reply packet\n");
 	} else if (arp->op_code == htons(ARPOP_REQUEST)) {
-- 
1.7.6.5

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