net: bridge: Fix VLANs memory leak

When adding / deleting VLANs to / from a bridge port, the bridge driver
first tries to propagate the information via switchdev and falls back to
the 8021q driver in case the underlying driver does not support
switchdev. This can result in a memory leak [1] when VXLAN and mlxsw
ports are enslaved to the bridge:

$ ip link set dev vxlan0 master br0
# No mlxsw ports are enslaved to 'br0', so mlxsw ignores the switchdev
# notification and the bridge driver adds the VLAN on 'vxlan0' via the
# 8021q driver
$ bridge vlan add vid 10 dev vxlan0 pvid untagged
# mlxsw port is enslaved to the bridge
$ ip link set dev swp1 master br0
# mlxsw processes the switchdev notification and the 8021q driver is
# skipped
$ bridge vlan del vid 10 dev vxlan0

This results in 'struct vlan_info' and 'struct vlan_vid_info' being
leaked, as they were allocated by the 8021q driver during VLAN addition,
but never freed as the 8021q driver was skipped during deletion.

Fix this by introducing a new VLAN private flag that indicates whether
the VLAN was added on the port by switchdev or the 8021q driver. If the
VLAN was added by the 8021q driver, then we make sure to delete it via
the 8021q driver as well.

[1]
unreferenced object 0xffff88822d20b1e8 (size 256):
  comm "bridge", pid 2532, jiffies 4295216998 (age 1188.830s)
  hex dump (first 32 bytes):
    e0 42 97 ce 81 88 ff ff 00 00 00 00 00 00 00 00  .B..............
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000f82d851d>] kmem_cache_alloc_trace+0x1be/0x330
    [<00000000e0178b02>] vlan_vid_add+0x661/0x920
    [<00000000218ebd5f>] __vlan_add+0x1be9/0x3a00
    [<000000006eafa1ca>] nbp_vlan_add+0x8b3/0xd90
    [<000000003535392c>] br_vlan_info+0x132/0x410
    [<00000000aedaa9dc>] br_afspec+0x75c/0x870
    [<00000000f5716133>] br_setlink+0x3dc/0x6d0
    [<00000000aceca5e2>] rtnl_bridge_setlink+0x615/0xb30
    [<00000000a2f2d23e>] rtnetlink_rcv_msg+0x3a3/0xa80
    [<0000000064097e69>] netlink_rcv_skb+0x152/0x3c0
    [<000000008be8d614>] rtnetlink_rcv+0x21/0x30
    [<000000009ab2ca25>] netlink_unicast+0x52f/0x740
    [<00000000e7d9ac96>] netlink_sendmsg+0x9c7/0xf50
    [<000000005d1e2050>] sock_sendmsg+0xbe/0x120
    [<00000000d51426bc>] ___sys_sendmsg+0x778/0x8f0
    [<00000000b9d7b2cc>] __sys_sendmsg+0x112/0x270
unreferenced object 0xffff888227454308 (size 32):
  comm "bridge", pid 2532, jiffies 4295216998 (age 1188.882s)
  hex dump (first 32 bytes):
    88 b2 20 2d 82 88 ff ff 88 b2 20 2d 82 88 ff ff  .. -...... -....
    81 00 0a 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000f82d851d>] kmem_cache_alloc_trace+0x1be/0x330
    [<0000000018050631>] vlan_vid_add+0x3e6/0x920
    [<00000000218ebd5f>] __vlan_add+0x1be9/0x3a00
    [<000000006eafa1ca>] nbp_vlan_add+0x8b3/0xd90
    [<000000003535392c>] br_vlan_info+0x132/0x410
    [<00000000aedaa9dc>] br_afspec+0x75c/0x870
    [<00000000f5716133>] br_setlink+0x3dc/0x6d0
    [<00000000aceca5e2>] rtnl_bridge_setlink+0x615/0xb30
    [<00000000a2f2d23e>] rtnetlink_rcv_msg+0x3a3/0xa80
    [<0000000064097e69>] netlink_rcv_skb+0x152/0x3c0
    [<000000008be8d614>] rtnetlink_rcv+0x21/0x30
    [<000000009ab2ca25>] netlink_unicast+0x52f/0x740
    [<00000000e7d9ac96>] netlink_sendmsg+0x9c7/0xf50
    [<000000005d1e2050>] sock_sendmsg+0xbe/0x120
    [<00000000d51426bc>] ___sys_sendmsg+0x778/0x8f0
    [<00000000b9d7b2cc>] __sys_sendmsg+0x112/0x270

Fixes: d70e42b2

 ("mlxsw: spectrum: Enable VxLAN enslavement to VLAN-aware bridges")
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Cc: Roopa Prabhu <roopa@cumulusnetworks.com>
Cc: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Cc: bridge@lists.linux-foundation.org
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>