ipv6: flush nd cache on IFF_NOARP change (c8507fb2) · Commits · 戴 / test

This patch is the IPv6 equivalent of commit ("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>

net/ipv6/ndisc.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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);

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