IPv6 tries to detect if devices have a lower link when dumping
addresses, but that detection doesn't work when the device and its
link have the same ifindex.
In this setup:
ip netns add main
ip netns add peer
ip -net main link add dummy0 type dummy # ifidx 9
ip -net main link add link dummy0 macvlan0 up netns peer type macvlan #
ifidx 9
We'll get:
ip -net peer -6 a
9: macvlan0: <snip>
Instead of:
ip -net peer -6 a
9: macvlan0@if9: <snip>
Instead of calling dev_get_iflink(), we can use the existence of the
ndo_get_iflink operation (which dev_get_iflink would call) to check if
a device has a lower link.
Fixes: d8a5ec672768 ("[NET]: netlink support for moving devices between network
namespaces.")
Signed-off-by: Sabrina Dubroca <s...@queasysnail.net>
---
net/ipv6/addrconf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 01146b66d666..688e441a8699 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -5835,7 +5835,7 @@ static int inet6_fill_ifinfo(struct sk_buff *skb, struct
inet6_dev *idev,
(dev->addr_len &&
nla_put(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr)) ||
nla_put_u32(skb, IFLA_MTU, dev->mtu) ||
- (dev->ifindex != dev_get_iflink(dev) &&
+ (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink &&
nla_put_u32(skb, IFLA_LINK, dev_get_iflink(dev))) ||
nla_put_u8(skb, IFLA_OPERSTATE,
netif_running(dev) ? dev->operstate : IF_OPER_DOWN))
--
2.28.0
