net: dsa: avoid suspicious RCU usage for synced VLAN-aware MAC addresses

When using the felix driver (the only one which supports UC filtering
and MC filtering) as a DSA master for a random other DSA switch, one can
see the following stack trace when the downstream switch ports join a
VLAN-aware bridge:

=============================
WARNING: suspicious RCU usage
-----------------------------
net/8021q/vlan_core.c:238 suspicious rcu_dereference_protected() usage!

stack backtrace:
Workqueue: dsa_ordered dsa_slave_switchdev_event_work
Call trace:
 lockdep_rcu_suspicious+0x170/0x210
 vlan_for_each+0x8c/0x188
 dsa_slave_sync_uc+0x128/0x178
 __hw_addr_sync_dev+0x138/0x158
 dsa_slave_set_rx_mode+0x58/0x70
 __dev_set_rx_mode+0x88/0xa8
 dev_uc_add+0x74/0xa0
 dsa_port_bridge_host_fdb_add+0xec/0x180
 dsa_slave_switchdev_event_work+0x7c/0x1c8
 process_one_work+0x290/0x568

What it's saying is that vlan_for_each() expects rtnl_lock() context and
it's not getting it, when it's called from the DSA master's ndo_set_rx_mode().

The caller of that - dsa_slave_set_rx_mode() - is the slave DSA
interface's dsa_port_bridge_host_fdb_add() which comes from the deferred
dsa_slave_switchdev_event_work().

We went to great lengths to avoid the rtnl_lock() context in that call
path in commit 0faf890fc5 ("net: dsa: drop rtnl_lock from
dsa_slave_switchdev_event_work"), and calling rtnl_lock() is simply not
an option due to the possibility of deadlocking when calling
dsa_flush_workqueue() from the call paths that do hold rtnl_lock() -
basically all of them.

So, when the DSA master calls vlan_for_each() from its ndo_set_rx_mode(),
the state of the 8021q driver on this device is really not protected
from concurrent access by anything.

Looking at net/8021q/, I don't think that vlan_info->vid_list was
particularly designed with RCU traversal in mind, so introducing an RCU
read-side form of vlan_for_each() - vlan_for_each_rcu() - won't be so
easy, and it also wouldn't be exactly what we need anyway.

In general I believe that the solution isn't in net/8021q/ anyway;
vlan_for_each() is not cut out for this task. DSA doesn't need rtnl_lock()
to be held per se - since it's not a netdev state change that we're
blocking, but rather, just concurrent additions/removals to a VLAN list.
We don't even need sleepable context - the callback of vlan_for_each()
just schedules deferred work.

The proposed escape is to remove the dependency on vlan_for_each() and
to open-code a non-sleepable, rtnl-free alternative to that, based on
copies of the VLAN list modified from .ndo_vlan_rx_add_vid() and
.ndo_vlan_rx_kill_vid().

Fixes: 64fdc5f341 ("net: dsa: sync unicast and multicast addresses for VLAN filters too")
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20230626154402.3154454-1-vladimir.oltean@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Vladimir Oltean 2023-06-26 18:44:02 +03:00 committed by Jakub Kicinski
parent eaaacb0851
commit d06f925f13
5 changed files with 74 additions and 31 deletions

View File

@ -314,9 +314,17 @@ struct dsa_port {
struct list_head fdbs;
struct list_head mdbs;
/* List of VLANs that CPU and DSA ports are members of. */
struct mutex vlans_lock;
struct list_head vlans;
union {
/* List of VLANs that CPU and DSA ports are members of.
* Access to this is serialized by the sleepable @vlans_lock.
*/
struct list_head vlans;
/* List of VLANs that user ports are members of.
* Access to this is serialized by netif_addr_lock_bh().
*/
struct list_head user_vlans;
};
};
/* TODO: ideally DSA ports would have a single dp->link_dp member,

View File

@ -1106,7 +1106,7 @@ static struct dsa_port *dsa_port_touch(struct dsa_switch *ds, int index)
mutex_init(&dp->vlans_lock);
INIT_LIST_HEAD(&dp->fdbs);
INIT_LIST_HEAD(&dp->mdbs);
INIT_LIST_HEAD(&dp->vlans);
INIT_LIST_HEAD(&dp->vlans); /* also initializes &dp->user_vlans */
INIT_LIST_HEAD(&dp->list);
list_add_tail(&dp->list, &dst->ports);

View File

@ -27,6 +27,7 @@
#include "master.h"
#include "netlink.h"
#include "slave.h"
#include "switch.h"
#include "tag.h"
struct dsa_switchdev_event_work {
@ -161,8 +162,7 @@ static int dsa_slave_schedule_standalone_work(struct net_device *dev,
return 0;
}
static int dsa_slave_host_vlan_rx_filtering(struct net_device *vdev, int vid,
void *arg)
static int dsa_slave_host_vlan_rx_filtering(void *arg, int vid)
{
struct dsa_host_vlan_rx_filtering_ctx *ctx = arg;
@ -170,6 +170,28 @@ static int dsa_slave_host_vlan_rx_filtering(struct net_device *vdev, int vid,
ctx->addr, vid);
}
static int dsa_slave_vlan_for_each(struct net_device *dev,
int (*cb)(void *arg, int vid), void *arg)
{
struct dsa_port *dp = dsa_slave_to_port(dev);
struct dsa_vlan *v;
int err;
lockdep_assert_held(&dev->addr_list_lock);
err = cb(arg, 0);
if (err)
return err;
list_for_each_entry(v, &dp->user_vlans, list) {
err = cb(arg, v->vid);
if (err)
return err;
}
return 0;
}
static int dsa_slave_sync_uc(struct net_device *dev,
const unsigned char *addr)
{
@ -180,18 +202,14 @@ static int dsa_slave_sync_uc(struct net_device *dev,
.addr = addr,
.event = DSA_UC_ADD,
};
int err;
dev_uc_add(master, addr);
if (!dsa_switch_supports_uc_filtering(dp->ds))
return 0;
err = dsa_slave_schedule_standalone_work(dev, DSA_UC_ADD, addr, 0);
if (err)
return err;
return vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering, &ctx);
return dsa_slave_vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering,
&ctx);
}
static int dsa_slave_unsync_uc(struct net_device *dev,
@ -204,18 +222,14 @@ static int dsa_slave_unsync_uc(struct net_device *dev,
.addr = addr,
.event = DSA_UC_DEL,
};
int err;
dev_uc_del(master, addr);
if (!dsa_switch_supports_uc_filtering(dp->ds))
return 0;
err = dsa_slave_schedule_standalone_work(dev, DSA_UC_DEL, addr, 0);
if (err)
return err;
return vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering, &ctx);
return dsa_slave_vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering,
&ctx);
}
static int dsa_slave_sync_mc(struct net_device *dev,
@ -228,18 +242,14 @@ static int dsa_slave_sync_mc(struct net_device *dev,
.addr = addr,
.event = DSA_MC_ADD,
};
int err;
dev_mc_add(master, addr);
if (!dsa_switch_supports_mc_filtering(dp->ds))
return 0;
err = dsa_slave_schedule_standalone_work(dev, DSA_MC_ADD, addr, 0);
if (err)
return err;
return vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering, &ctx);
return dsa_slave_vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering,
&ctx);
}
static int dsa_slave_unsync_mc(struct net_device *dev,
@ -252,18 +262,14 @@ static int dsa_slave_unsync_mc(struct net_device *dev,
.addr = addr,
.event = DSA_MC_DEL,
};
int err;
dev_mc_del(master, addr);
if (!dsa_switch_supports_mc_filtering(dp->ds))
return 0;
err = dsa_slave_schedule_standalone_work(dev, DSA_MC_DEL, addr, 0);
if (err)
return err;
return vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering, &ctx);
return dsa_slave_vlan_for_each(dev, dsa_slave_host_vlan_rx_filtering,
&ctx);
}
void dsa_slave_sync_ha(struct net_device *dev)
@ -1759,6 +1765,7 @@ static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
struct netlink_ext_ack extack = {0};
struct dsa_switch *ds = dp->ds;
struct netdev_hw_addr *ha;
struct dsa_vlan *v;
int ret;
/* User port... */
@ -1782,8 +1789,17 @@ static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
!dsa_switch_supports_mc_filtering(ds))
return 0;
v = kzalloc(sizeof(*v), GFP_KERNEL);
if (!v) {
ret = -ENOMEM;
goto rollback;
}
netif_addr_lock_bh(dev);
v->vid = vid;
list_add_tail(&v->list, &dp->user_vlans);
if (dsa_switch_supports_mc_filtering(ds)) {
netdev_for_each_synced_mc_addr(ha, dev) {
dsa_slave_schedule_standalone_work(dev, DSA_MC_ADD,
@ -1803,6 +1819,12 @@ static int dsa_slave_vlan_rx_add_vid(struct net_device *dev, __be16 proto,
dsa_flush_workqueue();
return 0;
rollback:
dsa_port_host_vlan_del(dp, &vlan);
dsa_port_vlan_del(dp, &vlan);
return ret;
}
static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
@ -1816,6 +1838,7 @@ static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
};
struct dsa_switch *ds = dp->ds;
struct netdev_hw_addr *ha;
struct dsa_vlan *v;
int err;
err = dsa_port_vlan_del(dp, &vlan);
@ -1832,6 +1855,15 @@ static int dsa_slave_vlan_rx_kill_vid(struct net_device *dev, __be16 proto,
netif_addr_lock_bh(dev);
v = dsa_vlan_find(&dp->user_vlans, &vlan);
if (!v) {
netif_addr_unlock_bh(dev);
return -ENOENT;
}
list_del(&v->list);
kfree(v);
if (dsa_switch_supports_mc_filtering(ds)) {
netdev_for_each_synced_mc_addr(ha, dev) {
dsa_slave_schedule_standalone_work(dev, DSA_MC_DEL,

View File

@ -673,8 +673,8 @@ static bool dsa_port_host_vlan_match(struct dsa_port *dp,
return false;
}
static struct dsa_vlan *dsa_vlan_find(struct list_head *vlan_list,
const struct switchdev_obj_port_vlan *vlan)
struct dsa_vlan *dsa_vlan_find(struct list_head *vlan_list,
const struct switchdev_obj_port_vlan *vlan)
{
struct dsa_vlan *v;

View File

@ -111,6 +111,9 @@ struct dsa_notifier_master_state_info {
bool operational;
};
struct dsa_vlan *dsa_vlan_find(struct list_head *vlan_list,
const struct switchdev_obj_port_vlan *vlan);
int dsa_tree_notify(struct dsa_switch_tree *dst, unsigned long e, void *v);
int dsa_broadcast(unsigned long e, void *v);