bonding: rlb mode of bond should not alter ARP originating via bridge

Orabug: 14650975
Do not modify or load balance ARP packets passing through balance-alb
mode (wherein the ARP did not originate locally, and arrived via a bridge).

Modifying pass-through ARP replies causes an incorrect MAC address
to be placed into the ARP packet, rendering peers unable to communicate
with the actual destination from which the ARP reply originated.

Load balancing pass-through ARP requests causes an entry to be
created for the peer in the rlb table, and bond_alb_monitor will
occasionally issue ARP updates to all peers in the table instrucing them
as to which MAC address they should communicate with; this occurs when
some event sets rx_ntt.  In the bridged case, however, the MAC address
used for the update would be the MAC of the slave, not the actual source
MAC of the originating destination.  This would render peers unable to
communicate with the destinations beyond the bridge.

Signed-off-by: Zheng Li <zheng.x.li@oracle.com>
Cc: Jay Vosburgh <fubar@us.ibm.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Conflicts:
	drivers/net/bonding/bonding.h

diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 935df1e8ef621f5284b6b0902aad238f2a161e74..7044c4613d775afb722f723c507be6232b6dbaf6 100644 (file)
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -704,6 +704,12 @@ static struct slave *rlb_arp_xmit(struct sk_buff *skb, struct bonding *bond)
        struct arp_pkt *arp = arp_pkt(skb);
        struct slave *tx_slave = NULL;
 
+       /* Don't modify or load balance ARPs that do not originate locally
+        * (e.g.,arrive via a bridge).
+        */
+       if (!bond_slave_has_mac(bond, arp->mac_src))
+               return NULL;
+
        if (arp->op_code == htons(ARPOP_REPLY)) {
                /* the arp must be sent on the selected
                * rx channel

diff --git a/drivers/net/bonding/bonding.h b/drivers/net/bonding/bonding.h
index ea1d005be92d81455e66805179fe928382f27476..a3559e325281b6b3773011276f95378ee2593666 100644 (file)
--- a/drivers/net/bonding/bonding.h
+++ b/drivers/net/bonding/bonding.h
@@ -21,6 +21,8 @@
 #include <linux/cpumask.h>
 #include <linux/in6.h>
 #include <linux/netpoll.h>
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
 #include "bond_3ad.h"
 #include "bond_alb.h"
 
@@ -431,6 +433,18 @@ static inline void bond_destroy_proc_dir(struct bond_net *bn)
 }
 #endif
 
+static inline struct slave *bond_slave_has_mac(struct bonding *bond,
+                                              const u8 *mac)
+{
+       int i = 0;
+       struct slave *tmp;
+
+       bond_for_each_slave(bond, tmp, i)
+               if (compare_ether_addr_64bits(mac, tmp->dev->dev_addr))
+                       return tmp;
+
+       return NULL;
+}
 
 /* exported from bond_main.c */
 extern int bond_net_id;