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net: check vlan filter feature in vlan_vids_add_by_dev() and vlan_vid…
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…s_del_by_dev()

I got the below warning trace:

WARNING: CPU: 4 PID: 4056 at net/core/dev.c:11066 unregister_netdevice_many_notify
CPU: 4 PID: 4056 Comm: ip Not tainted 6.7.0-rc4+ #15
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014
RIP: 0010:unregister_netdevice_many_notify+0x9a4/0x9b0
Call Trace:
 rtnl_dellink
 rtnetlink_rcv_msg
 netlink_rcv_skb
 netlink_unicast
 netlink_sendmsg
 __sock_sendmsg
 ____sys_sendmsg
 ___sys_sendmsg
 __sys_sendmsg
 do_syscall_64
 entry_SYSCALL_64_after_hwframe

It can be repoduced via:

    ip netns add ns1
    ip netns exec ns1 ip link add bond0 type bond mode 0
    ip netns exec ns1 ip link add bond_slave_1 type veth peer veth2
    ip netns exec ns1 ip link set bond_slave_1 master bond0
[1] ip netns exec ns1 ethtool -K bond0 rx-vlan-filter off
[2] ip netns exec ns1 ip link add link bond_slave_1 name bond_slave_1.0 type vlan id 0
[3] ip netns exec ns1 ip link add link bond0 name bond0.0 type vlan id 0
[4] ip netns exec ns1 ip link set bond_slave_1 nomaster
[5] ip netns exec ns1 ip link del veth2
    ip netns del ns1

This is all caused by command [1] turning off the rx-vlan-filter function
of bond0. The reason is the same as commit 01f4fd2 ("bonding: Fix
incorrect deletion of ETH_P_8021AD protocol vid from slaves"). Commands
[2] [3] add the same vid to slave and master respectively, causing
command [4] to empty slave->vlan_info. The following command [5] triggers
this problem.

To fix this problem, we should add VLAN_FILTER feature checks in
vlan_vids_add_by_dev() and vlan_vids_del_by_dev() to prevent incorrect
addition or deletion of vlan_vid information.

Fixes: 348a144 ("vlan: introduce functions to do mass addition/deletion of vids by another device")
Signed-off-by: Liu Jian <[email protected]>
Signed-off-by: Paolo Abeni <[email protected]>
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liujian56 authored and Paolo Abeni committed Dec 19, 2023
1 parent fa94a0c commit 01a564b
Showing 1 changed file with 8 additions and 1 deletion.
9 changes: 8 additions & 1 deletion net/8021q/vlan_core.c
Original file line number Diff line number Diff line change
Expand Up @@ -407,6 +407,8 @@ int vlan_vids_add_by_dev(struct net_device *dev,
return 0;

list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
if (!vlan_hw_filter_capable(by_dev, vid_info->proto))
continue;
err = vlan_vid_add(dev, vid_info->proto, vid_info->vid);
if (err)
goto unwind;
Expand All @@ -417,6 +419,8 @@ int vlan_vids_add_by_dev(struct net_device *dev,
list_for_each_entry_continue_reverse(vid_info,
&vlan_info->vid_list,
list) {
if (!vlan_hw_filter_capable(by_dev, vid_info->proto))
continue;
vlan_vid_del(dev, vid_info->proto, vid_info->vid);
}

Expand All @@ -436,8 +440,11 @@ void vlan_vids_del_by_dev(struct net_device *dev,
if (!vlan_info)
return;

list_for_each_entry(vid_info, &vlan_info->vid_list, list)
list_for_each_entry(vid_info, &vlan_info->vid_list, list) {
if (!vlan_hw_filter_capable(by_dev, vid_info->proto))
continue;
vlan_vid_del(dev, vid_info->proto, vid_info->vid);
}
}
EXPORT_SYMBOL(vlan_vids_del_by_dev);

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