[net-next PATCH] net: rtnetlink: Support alias interfaces with RTM_GETLINK

[Phil Sutter]

Align interface name handling regarding alias interfaces in
rtnl_getlink() with dev_ioctl() treating SIOCGIFINDEX ioctl calls. The
latter function strips any colon suffix before doing the interface
lookup, do the same for RTM_GETLINK requests.

Signed-off-by: Phil Sutter <p...@nwl.cc>
---
 net/core/rtnetlink.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a51cab95ba64c..aaee4df0ff00c 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3312,8 +3312,10 @@ static int rtnl_getlink(struct sk_buff *skb, struct 
nlmsghdr *nlh,
                        return PTR_ERR(tgt_net);
        }
 
-       if (tb[IFLA_IFNAME])
+       if (tb[IFLA_IFNAME]) {
                nla_strlcpy(ifname, tb[IFLA_IFNAME], IFNAMSIZ);
+               *strchrnul(ifname, ':') = '\0';
+       }
 
        if (tb[IFLA_EXT_MASK])
                ext_filter_mask = nla_get_u32(tb[IFLA_EXT_MASK]);
-- 
2.20.1