[PATCH net 2/2] tipc: set ub->ifindex for local ipv6 address

[Xin Long]

Without ub->ifindex set for ipv6 address in tipc_udp_enable(),
ipv6_sock_mc_join() may make the wrong dev join the multicast
address in enable_mcast(). This causes that tipc links would
never be created.

So fix it by getting the right netdev and setting ub->ifindex,
as it does for ipv4 address.

Reported-by: Shuang Li <shu...@redhat.com>
Signed-off-by: Xin Long <lucien....@gmail.com>
---
 net/tipc/udp_media.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/net/tipc/udp_media.c b/net/tipc/udp_media.c
index 28a283f..9dec596 100644
--- a/net/tipc/udp_media.c
+++ b/net/tipc/udp_media.c
@@ -738,6 +738,13 @@ static int tipc_udp_enable(struct net *net, struct 
tipc_bearer *b,
                b->mtu = b->media->mtu;
 #if IS_ENABLED(CONFIG_IPV6)
        } else if (local.proto == htons(ETH_P_IPV6)) {
+               struct net_device *dev;
+
+               dev = ipv6_dev_find(net, &local.ipv6);
+               if (!dev) {
+                       err = -ENODEV;
+                       goto err;
+               }
                udp_conf.family = AF_INET6;
                udp_conf.use_udp6_tx_checksums = true;
                udp_conf.use_udp6_rx_checksums = true;
@@ -745,6 +752,7 @@ static int tipc_udp_enable(struct net *net, struct 
tipc_bearer *b,
                        udp_conf.local_ip6 = in6addr_any;
                else
                        udp_conf.local_ip6 = local.ipv6;
+               ub->ifindex = dev->ifindex;
                b->mtu = 1280;
 #endif
        } else {
-- 
2.1.0