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authorIdo Schimmel <idosch@mellanox.com>2018-01-07 12:45:05 +0200
committerDavid S. Miller <davem@davemloft.net>2018-01-07 21:29:40 -0500
commit27c6fa73f93b81671a77bdaa242473c3bda0ac4a (patch)
tree8e7315ee734ecd034ee4fee1059b2ff54a49578f
parent4c981e28d373e391b76577635e7e216976b71c57 (diff)
ipv6: Set nexthop flags upon carrier change
Similar to IPv4, when the carrier of a netdev changes we should toggle the 'linkdown' flag on all the nexthops using it as their nexthop device. This will later allow us to test for the presence of this flag during route lookup and dump. Up until commit 4832c30d5458 ("net: ipv6: put host and anycast routes on device with address") host and anycast routes used the loopback netdev as their nexthop device and thus were not marked with the 'linkdown' flag. The patch preserves this behavior and allows one to ping the local address even when the nexthop device does not have a carrier and the 'ignore_routes_with_linkdown' sysctl is set. Signed-off-by: Ido Schimmel <idosch@mellanox.com> Acked-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/net/ip6_route.h1
-rw-r--r--net/ipv6/addrconf.c2
-rw-r--r--net/ipv6/route.c23
3 files changed, 20 insertions, 6 deletions
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 6a2f80cbdf65..34cd3b0c6ded 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -170,6 +170,7 @@ void rt6_remove_prefsrc(struct inet6_ifaddr *ifp);
void rt6_clean_tohost(struct net *net, struct in6_addr *gateway);
void rt6_sync_up(struct net_device *dev, unsigned int nh_flags);
void rt6_disable_ip(struct net_device *dev, unsigned long event);
+void rt6_sync_down_dev(struct net_device *dev, unsigned long event);
static inline const struct rt6_info *skb_rt6_info(const struct sk_buff *skb)
{
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a13e1ffe87ec..2435f7ab070b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -3438,6 +3438,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
} else if (event == NETDEV_CHANGE) {
if (!addrconf_link_ready(dev)) {
/* device is still not ready. */
+ rt6_sync_down_dev(dev, event);
break;
}
@@ -3449,6 +3450,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event,
* multicast snooping switches
*/
ipv6_mc_up(idev);
+ rt6_sync_up(dev, RTNH_F_LINKDOWN);
break;
}
idev->if_flags |= IF_READY;
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 194fe9d9cd85..2fd36c7dd143 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3498,18 +3498,29 @@ static int fib6_ifdown(struct rt6_info *rt, void *p_arg)
const struct net_device *dev = arg->dev;
const struct net *net = dev_net(dev);
- if (rt->dst.dev == dev &&
- rt != net->ipv6.ip6_null_entry &&
- (rt->rt6i_nsiblings == 0 || netdev_unregistering(dev) ||
- !rt->rt6i_idev->cnf.ignore_routes_with_linkdown)) {
- rt->rt6i_nh_flags |= (RTNH_F_DEAD | RTNH_F_LINKDOWN);
+ if (rt->dst.dev != dev || rt == net->ipv6.ip6_null_entry)
+ return 0;
+
+ switch (arg->event) {
+ case NETDEV_UNREGISTER:
return -1;
+ case NETDEV_DOWN:
+ if (rt->rt6i_nsiblings == 0 ||
+ !rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
+ return -1;
+ rt->rt6i_nh_flags |= RTNH_F_DEAD;
+ /* fall through */
+ case NETDEV_CHANGE:
+ if (rt->rt6i_flags & (RTF_LOCAL | RTF_ANYCAST))
+ break;
+ rt->rt6i_nh_flags |= RTNH_F_LINKDOWN;
+ break;
}
return 0;
}
-static void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
+void rt6_sync_down_dev(struct net_device *dev, unsigned long event)
{
struct arg_netdev_event arg = {
.dev = dev,