rtnetlink: catch -EOPNOTSUPP errors from ndo_bridge_getlink

problem reported:
	kernel 4.1.3
	------------
	# bridge vlan
	port	vlan ids
	eth0	 1 PVID Egress Untagged
	 	90
	 	91
	 	92
	 	93
	 	94
	 	95
	 	96
	 	97
	 	98
	 	99
	 	100

	vmbr0	 1 PVID Egress Untagged
	 	94

	kernel 4.2
	-----------
	# bridge vlan
	port	vlan ids

ndo_bridge_getlink can return -EOPNOTSUPP when an interfaces
ndo_bridge_getlink op is set to switchdev_port_bridge_getlink
and CONFIG_SWITCHDEV is not defined. This today can happen to
bond, rocker and team devices. This patch adds -EOPNOTSUPP
checks after calls to ndo_bridge_getlink.

Fixes: 85fdb956726ff2a ("switchdev: cut over to new switchdev_port_bridge_getlink")
Reported-by: Alexandre DERUMIER <aderumier@odiso.com>
Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 10 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a466821d1441..0ec48403ed68 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -3047,6 +3047,7 @@ static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
         u32 portid = NETLINK_CB(cb->skb).portid;
         u32 seq = cb->nlh->nlmsg_seq;
         u32 filter_mask = 0;
+        int err;
 
         if (nlmsg_len(cb->nlh) > sizeof(struct ifinfomsg)) {
                 struct nlattr *extfilt;
@@ -3067,20 +3068,25 @@ static int rtnl_bridge_getlink(struct sk_buff *skb, struct netlink_callback *cb)
                 struct net_device *br_dev = netdev_master_upper_dev_get(dev);
 
                 if (br_dev && br_dev->netdev_ops->ndo_bridge_getlink) {
-                        if (idx >= cb->args[0] &&
-                            br_dev->netdev_ops->ndo_bridge_getlink(
-                                    skb, portid, seq, dev, filter_mask,
-                                    NLM_F_MULTI) < 0)
-                                break;
+                        if (idx >= cb->args[0]) {
+                                err = br_dev->netdev_ops->ndo_bridge_getlink(
+                                                skb, portid, seq, dev,
+                                                filter_mask, NLM_F_MULTI);
+                                if (err < 0 && err != -EOPNOTSUPP)
+                                        break;
+                        }
                         idx++;
                 }
 
                 if (ops->ndo_bridge_getlink) {
-                        if (idx >= cb->args[0] &&
-                            ops->ndo_bridge_getlink(skb, portid, seq, dev,
-                                                    filter_mask,
-                                                    NLM_F_MULTI) < 0)
-                                break;
+                        if (idx >= cb->args[0]) {
+                                err = ops->ndo_bridge_getlink(skb, portid,
+                                                              seq, dev,
+                                                              filter_mask,
+                                                              NLM_F_MULTI);
+                                if (err < 0 && err != -EOPNOTSUPP)
+                                        break;
+                        }
                         idx++;
                 }
         }