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bonding: Do not tx-balance some IPv6 packets on ALB/TLB bonds

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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>
This commit is contained in:
Vlad Yasevich 2008-08-28 15:38:41 -04:00 committed by Jeff Garzik
parent f382a0a8e9
commit 2d1ea19da0
1 changed files with 24 additions and 0 deletions
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24
drivers/net/bonding/bond_alb.c
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@ -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;