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vxlan: Allow vetoing of FDB notifications

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Change vxlan_fdb_switchdev_call_notifiers() to return the result from
calling switchdev notifiers. Propagate the error number up the stack.

In vxlan_fdb_update_existing() and vxlan_fdb_update_create() add
rollbacks to clean up the work that was done before the veto.

Signed-off-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Petr Machata 2019-01-16 23:06:38 +00:00 committed by David S. Miller
parent ccdfd4f71d
commit 61f46fe8c6
1 changed files with 46 additions and 18 deletions
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64
drivers/net/vxlan.c
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@ -375,32 +375,38 @@ static void vxlan_fdb_switchdev_notifier_info(const struct vxlan_dev *vxlan,
fdb_info->added_by_user = fdb->flags & NTF_VXLAN_ADDED_BY_USER;
}
static void vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
struct vxlan_fdb *fdb,
struct vxlan_rdst *rd,
bool adding)
static int vxlan_fdb_switchdev_call_notifiers(struct vxlan_dev *vxlan,
struct vxlan_fdb *fdb,
struct vxlan_rdst *rd,
bool adding)
{
struct switchdev_notifier_vxlan_fdb_info info;
enum switchdev_notifier_type notifier_type;
int ret;
if (WARN_ON(!rd))
return;
return 0;
notifier_type = adding ? SWITCHDEV_VXLAN_FDB_ADD_TO_DEVICE
: SWITCHDEV_VXLAN_FDB_DEL_TO_DEVICE;
vxlan_fdb_switchdev_notifier_info(vxlan, fdb, rd, &info);
call_switchdev_notifiers(notifier_type, vxlan->dev,
&info.info);
ret = call_switchdev_notifiers(notifier_type, vxlan->dev,
&info.info);
return notifier_to_errno(ret);
}
static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
struct vxlan_rdst *rd, int type, bool swdev_notify)
static int vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
struct vxlan_rdst *rd, int type, bool swdev_notify)
{
int err;
if (swdev_notify) {
switch (type) {
case RTM_NEWNEIGH:
vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
true);
err = vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
true);
if (err)
return err;
break;
case RTM_DELNEIGH:
vxlan_fdb_switchdev_call_notifiers(vxlan, fdb, rd,
@ -410,6 +416,7 @@ static void vxlan_fdb_notify(struct vxlan_dev *vxlan, struct vxlan_fdb *fdb,
}
__vxlan_fdb_notify(vxlan, fdb, rd, type);
return 0;
}
static void vxlan_ip_miss(struct net_device *dev, union vxlan_addr *ipa)
@ -868,7 +875,8 @@ static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
struct vxlan_rdst *rd = NULL;
struct vxlan_rdst oldrd;
int notify = 0;
int rc;
int rc = 0;
int err;
/* Do not allow an externally learned entry to take over an entry added
* by the user.
@ -915,10 +923,20 @@ static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
if (rd == NULL)
rd = first_remote_rtnl(f);
vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH, swdev_notify);
err = vxlan_fdb_notify(vxlan, f, rd, RTM_NEWNEIGH,
swdev_notify);
if (err)
goto err_notify;
}
return 0;
err_notify:
if ((flags & NLM_F_REPLACE) && rc)
*rd = oldrd;
else if ((flags & NLM_F_APPEND) && rc)
list_del_rcu(&rd->list);
return err;
}
static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
@ -943,9 +961,16 @@ static int vxlan_fdb_update_create(struct vxlan_dev *vxlan,
if (rc < 0)
return rc;
vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
swdev_notify);
rc = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
swdev_notify);
if (rc)
goto err_notify;
return 0;
err_notify:
vxlan_fdb_destroy(vxlan, f, false, false);
return rc;
}
/* Add new entry to forwarding table -- assumes lock held */
@ -3515,9 +3540,12 @@ static int __vxlan_dev_create(struct net *net, struct net_device *dev,
goto errout;
/* notify default fdb entry */
if (f)
vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f), RTM_NEWNEIGH,
true);
if (f) {
err = vxlan_fdb_notify(vxlan, f, first_remote_rtnl(f),
RTM_NEWNEIGH, true);
if (err)
goto errout;
}
list_add(&vxlan->next, &vn->vxlan_list);
return 0;