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authorVlad Yasevich <vladislav.yasevich@hp.com>2008-08-28 15:38:41 -0400
committerJeff Garzik <jgarzik@redhat.com>2008-09-24 18:49:01 -0400
commit2d1ea19da0e84117d3ebbad981e4664bef03152e (patch)
tree0b073f7b68399b35bc122487ee8dcfc5d6492901 /drivers/net/bonding/bond_alb.c
parentf382a0a8e9403c6d7f8b2cfa21e41fefb5d0c9bd (diff)
bonding: Do not tx-balance some IPv6 packets on ALB/TLB bonds
IPv6 all-node-multicasts and DAD probes should not be tx-balanced on ALB/TLB bonds. The all-node-multicast is an equivalent to IPv4 broadcasts. DAD probes have to be sent only on the primary so that we don't get false-positive detections. Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/net/bonding/bond_alb.c')
-rw-r--r--drivers/net/bonding/bond_alb.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c
index 3d39278a63e..ade5f3f6693 100644
--- a/drivers/net/bonding/bond_alb.c
+++ b/drivers/net/bonding/bond_alb.c
@@ -38,6 +38,7 @@
#include <linux/in.h>
#include <net/ipx.h>
#include <net/arp.h>
+#include <net/ipv6.h>
#include <asm/byteorder.h>
#include "bonding.h"
#include "bond_alb.h"
@@ -81,6 +82,7 @@
#define RLB_PROMISC_TIMEOUT 10*ALB_TIMER_TICKS_PER_SEC
static const u8 mac_bcast[ETH_ALEN] = {0xff,0xff,0xff,0xff,0xff,0xff};
+static const u8 mac_v6_allmcast[ETH_ALEN] = {0x33,0x33,0x00,0x00,0x00,0x01};
static const int alb_delta_in_ticks = HZ / ALB_TIMER_TICKS_PER_SEC;
#pragma pack(1)
@@ -1290,6 +1292,7 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
u32 hash_index = 0;
const u8 *hash_start = NULL;
int res = 1;
+ struct ipv6hdr *ip6hdr;
skb_reset_mac_header(skb);
eth_data = eth_hdr(skb);
@@ -1319,11 +1322,32 @@ int bond_alb_xmit(struct sk_buff *skb, struct net_device *bond_dev)
}
break;
case ETH_P_IPV6:
+ /* IPv6 doesn't really use broadcast mac address, but leave
+ * that here just in case.
+ */
if (memcmp(eth_data->h_dest, mac_bcast, ETH_ALEN) == 0) {
do_tx_balance = 0;
break;
}
+ /* IPv6 uses all-nodes multicast as an equivalent to
+ * broadcasts in IPv4.
+ */
+ if (memcmp(eth_data->h_dest, mac_v6_allmcast, ETH_ALEN) == 0) {
+ do_tx_balance = 0;
+ break;
+ }
+
+ /* Additianally, DAD probes should not be tx-balanced as that
+ * will lead to false positives for duplicate addresses and
+ * prevent address configuration from working.
+ */
+ ip6hdr = ipv6_hdr(skb);
+ if (ipv6_addr_any(&ip6hdr->saddr)) {
+ do_tx_balance = 0;
+ break;
+ }
+
hash_start = (char *)&(ipv6_hdr(skb)->daddr);
hash_size = sizeof(ipv6_hdr(skb)->daddr);
break;