diff options
| author | Alex Wang <alexw@nicira.com> | 2014-06-30 20:30:29 -0700 |
|---|---|---|
| committer | Pravin B Shelar <pshelar@nicira.com> | 2014-06-30 20:47:15 -0700 |
| commit | 4a46b24e147dfa9b858026da02cad0bdd4e149d2 (patch) | |
| tree | 0a36962df76d37c1f44bfb683991848b7e23ed07 /net/openvswitch/datapath.c | |
| parent | ad55200734c65a3ec5d0c39d6ea904008baea536 (diff) | |
openvswitch: Use exact lookup for flow_get and flow_del.
Due to the race condition in userspace, there is chance that two
overlapping megaflows could be installed in datapath. And this
causes userspace unable to delete the less inclusive megaflow flow
even after it timeout, since the flow_del logic will stop at the
first match of masked flow.
This commit fixes the bug by making the kernel flow_del and flow_get
logic check all masks in that case.
Introduced by 03f0d916a (openvswitch: Mega flow implementation).
Signed-off-by: Alex Wang <alexw@nicira.com>
Acked-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Diffstat (limited to 'net/openvswitch/datapath.c')
| -rw-r--r-- | net/openvswitch/datapath.c | 23 |
1 files changed, 11 insertions, 12 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index a863678c50a..9db4bf6740d 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -889,8 +889,11 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) } /* The unmasked key has to be the same for flow updates. */ if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) { - error = -EEXIST; - goto err_unlock_ovs; + flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); + if (!flow) { + error = -ENOENT; + goto err_unlock_ovs; + } } /* Update actions. */ old_acts = ovsl_dereference(flow->sf_acts); @@ -981,16 +984,12 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) goto err_unlock_ovs; } /* Check that the flow exists. */ - flow = ovs_flow_tbl_lookup(&dp->table, &key); + flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); if (unlikely(!flow)) { error = -ENOENT; goto err_unlock_ovs; } - /* The unmasked key has to be the same for flow updates. */ - if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) { - error = -EEXIST; - goto err_unlock_ovs; - } + /* Update actions, if present. */ if (likely(acts)) { old_acts = ovsl_dereference(flow->sf_acts); @@ -1063,8 +1062,8 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) goto unlock; } - flow = ovs_flow_tbl_lookup(&dp->table, &key); - if (!flow || !ovs_flow_cmp_unmasked_key(flow, &match)) { + flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); + if (!flow) { err = -ENOENT; goto unlock; } @@ -1113,8 +1112,8 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) goto unlock; } - flow = ovs_flow_tbl_lookup(&dp->table, &key); - if (unlikely(!flow || !ovs_flow_cmp_unmasked_key(flow, &match))) { + flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); + if (unlikely(!flow)) { err = -ENOENT; goto unlock; } |