6.15-stable review patch. If anyone has any objections, please let me know.
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From: Cosmin Ratiu cratiu@nvidia.com
[ Upstream commit d2fddbd3479928e52061e1c8dd302006b6283ce8 ]
Refactor the bonding ipsec offload operations to fix a number of long-standing control plane races between state migration and user deletion and a few other issues.
xfrm state deletion can happen concurrently with bond_change_active_slave() operation. This manifests itself as a bond_ipsec_del_sa() call with x->lock held, followed by a bond_ipsec_free_sa() a bit later from a wq. The alternate path of these calls coming from xfrm_dev_state_flush() can't happen, as that needs the RTNL lock and bond_change_active_slave() already holds it.
1. bond_ipsec_del_sa_all() might call xdo_dev_state_delete() a second time on an xfrm state that was concurrently killed. This is bad. 2. bond_ipsec_add_sa_all() can add a state on the new device, but pending bond_ipsec_free_sa() calls from the old device will then hit the WARN_ON() and then, worse, call xdo_dev_state_free() on the new device without a corresponding xdo_dev_state_delete(). 3. Resolve a sleeping in atomic context introduced by the mentioned "Fixes" commit.
bond_ipsec_del_sa_all() and bond_ipsec_add_sa_all() now acquire x->lock and check for x->km.state to help with problems 1 and 2. And since xso.real_dev is now a private pointer managed by the bonding driver in xfrm state, make better use of it to fully fix problems 1 and 2. In bond_ipsec_del_sa_all(), set xso.real_dev to NULL while holding both the mutex and x->lock, which makes sure that neither bond_ipsec_del_sa() nor bond_ipsec_free_sa() could run concurrently.
Fix problem 3 by moving the list cleanup (which requires the mutex) from bond_ipsec_del_sa() (called from atomic context) to bond_ipsec_free_sa()
Finally, simplify bond_ipsec_del_sa() and bond_ipsec_free_sa() by using xso->real_dev directly, since it's now protected by locks and can be trusted to always reflect the offload device.
Fixes: 2aeeef906d5a ("bonding: change ipsec_lock from spin lock to mutex") Signed-off-by: Cosmin Ratiu cratiu@nvidia.com Reviewed-by: Leon Romanovsky leonro@nvidia.com Reviewed-by: Nikolay Aleksandrov razor@blackwall.org Reviewed-by: Hangbin Liu liuhangbin@gmail.com Tested-by: Hangbin Liu liuhangbin@gmail.com Signed-off-by: Steffen Klassert steffen.klassert@secunet.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/bonding/bond_main.c | 82 +++++++++++++++------------------ include/net/xfrm.h | 7 ++- 2 files changed, 41 insertions(+), 48 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 14ebbe82a2c5b..4461220bcd58d 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -545,7 +545,20 @@ static void bond_ipsec_add_sa_all(struct bonding *bond) slave_warn(bond_dev, real_dev, "%s: failed to add SA\n", __func__); continue; } + + spin_lock_bh(&ipsec->xs->lock); + /* xs might have been killed by the user during the migration + * to the new dev, but bond_ipsec_del_sa() should have done + * nothing, as xso.real_dev is NULL. + * Delete it from the device we just added it to. The pending + * bond_ipsec_free_sa() call will do the rest of the cleanup. + */ + if (ipsec->xs->km.state == XFRM_STATE_DEAD && + real_dev->xfrmdev_ops->xdo_dev_state_delete) + real_dev->xfrmdev_ops->xdo_dev_state_delete(real_dev, + ipsec->xs); ipsec->xs->xso.real_dev = real_dev; + spin_unlock_bh(&ipsec->xs->lock); } out: mutex_unlock(&bond->ipsec_lock); @@ -560,48 +573,20 @@ static void bond_ipsec_del_sa(struct net_device *bond_dev, struct xfrm_state *xs) { struct net_device *real_dev; - netdevice_tracker tracker; - struct bond_ipsec *ipsec; - struct bonding *bond; - struct slave *slave;
- if (!bond_dev) + if (!bond_dev || !xs->xso.real_dev) return;
- rcu_read_lock(); - bond = netdev_priv(bond_dev); - slave = rcu_dereference(bond->curr_active_slave); - real_dev = slave ? slave->dev : NULL; - netdev_hold(real_dev, &tracker, GFP_ATOMIC); - rcu_read_unlock(); - - if (!slave) - goto out; - - if (!xs->xso.real_dev) - goto out; - - WARN_ON(xs->xso.real_dev != real_dev); + real_dev = xs->xso.real_dev;
if (!real_dev->xfrmdev_ops || !real_dev->xfrmdev_ops->xdo_dev_state_delete || netif_is_bond_master(real_dev)) { slave_warn(bond_dev, real_dev, "%s: no slave xdo_dev_state_delete\n", __func__); - goto out; + return; }
real_dev->xfrmdev_ops->xdo_dev_state_delete(real_dev, xs); -out: - netdev_put(real_dev, &tracker); - mutex_lock(&bond->ipsec_lock); - list_for_each_entry(ipsec, &bond->ipsec_list, list) { - if (ipsec->xs == xs) { - list_del(&ipsec->list); - kfree(ipsec); - break; - } - } - mutex_unlock(&bond->ipsec_lock); }
static void bond_ipsec_del_sa_all(struct bonding *bond) @@ -629,9 +614,15 @@ static void bond_ipsec_del_sa_all(struct bonding *bond) __func__); continue; } + + spin_lock_bh(&ipsec->xs->lock); ipsec->xs->xso.real_dev = NULL; - real_dev->xfrmdev_ops->xdo_dev_state_delete(real_dev, - ipsec->xs); + /* Don't double delete states killed by the user. */ + if (ipsec->xs->km.state != XFRM_STATE_DEAD) + real_dev->xfrmdev_ops->xdo_dev_state_delete(real_dev, + ipsec->xs); + spin_unlock_bh(&ipsec->xs->lock); + if (real_dev->xfrmdev_ops->xdo_dev_state_free) real_dev->xfrmdev_ops->xdo_dev_state_free(real_dev, ipsec->xs); @@ -643,34 +634,33 @@ static void bond_ipsec_free_sa(struct net_device *bond_dev, struct xfrm_state *xs) { struct net_device *real_dev; - netdevice_tracker tracker; + struct bond_ipsec *ipsec; struct bonding *bond; - struct slave *slave;
if (!bond_dev) return;
- rcu_read_lock(); bond = netdev_priv(bond_dev); - slave = rcu_dereference(bond->curr_active_slave); - real_dev = slave ? slave->dev : NULL; - netdev_hold(real_dev, &tracker, GFP_ATOMIC); - rcu_read_unlock(); - - if (!slave) - goto out;
+ mutex_lock(&bond->ipsec_lock); if (!xs->xso.real_dev) goto out;
- WARN_ON(xs->xso.real_dev != real_dev); + real_dev = xs->xso.real_dev;
xs->xso.real_dev = NULL; - if (real_dev && real_dev->xfrmdev_ops && + if (real_dev->xfrmdev_ops && real_dev->xfrmdev_ops->xdo_dev_state_free) real_dev->xfrmdev_ops->xdo_dev_state_free(real_dev, xs); out: - netdev_put(real_dev, &tracker); + list_for_each_entry(ipsec, &bond->ipsec_list, list) { + if (ipsec->xs == xs) { + list_del(&ipsec->list); + kfree(ipsec); + break; + } + } + mutex_unlock(&bond->ipsec_lock); }
/** diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 01783dc3d0e32..1f1861c57e2ad 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -154,8 +154,11 @@ struct xfrm_dev_offload { */ struct net_device *dev; netdevice_tracker dev_tracker; - /* This is a private pointer used by the bonding driver. - * Device drivers should not use it. + /* This is a private pointer used by the bonding driver (and eventually + * should be moved there). Device drivers should not use it. + * Protected by xfrm_state.lock AND bond.ipsec_lock in most cases, + * except in the .xdo_dev_state_del() flow, where only xfrm_state.lock + * is held. */ struct net_device *real_dev; unsigned long offload_handle;