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authorEric Dumazet <edumazet@google.com>2015-07-29 12:01:41 +0200
committerDavid S. Miller <davem@davemloft.net>2015-07-29 23:01:39 -0700
commitc8507fb235bea3314a02a67ddda0d4e6cf01fa78 (patch)
tree72614a517252c75efc1b8e3b1803cb6cc395c92c
parentb2428f94f4f79cc6045e538ed3e8329b16711712 (diff)
ipv6: flush nd cache on IFF_NOARP change
This patch is the IPv6 equivalent of commit 6c8b4e3ff81b ("arp: flush arp cache on IFF_NOARP change") Without it, we keep buggy neighbours in the cache, with destination MAC address equal to our own MAC address. Tested: tcpdump -i eth0 -s 0 ip6 -n -e & ip link set dev eth0 arp off ping6 remote // sends buggy frames ip link set dev eth0 arp on ping6 remote // should work once kernel is patched Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Mario Fanelli <mariofanelli@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv6/ndisc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 0a05b35a90fc..c53331cfed95 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1650,6 +1650,7 @@ int ndisc_rcv(struct sk_buff *skb)
static int ndisc_netdev_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+ struct netdev_notifier_change_info *change_info;
struct net *net = dev_net(dev);
struct inet6_dev *idev;
@@ -1664,6 +1665,11 @@ static int ndisc_netdev_event(struct notifier_block *this, unsigned long event,
ndisc_send_unsol_na(dev);
in6_dev_put(idev);
break;
+ case NETDEV_CHANGE:
+ change_info = ptr;
+ if (change_info->flags_changed & IFF_NOARP)
+ neigh_changeaddr(&nd_tbl, dev);
+ break;
case NETDEV_DOWN:
neigh_ifdown(&nd_tbl, dev);
fib6_run_gc(0, net, false);