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authorJarno Rajahalme <jarno@ovn.org>2016-06-21 14:59:38 -0700
committerDavid S. Miller <davem@davemloft.net>2016-06-25 11:55:51 -0400
commit7d904c7bcd51f72579c0c3134a50896c5a3efb9f (patch)
tree6c37dd06d6890378e1a48221e09fa42980fd3d08 /net/openvswitch
parent1c1779fa54b2a9d4e1de990095d790d64b9e00a1 (diff)
openvswitch: Only set mark and labels with a commit flag.
Only set conntrack mark or labels when the commit flag is specified. This makes sure we can not set them before the connection has been persisted, as in that case the mark and labels would be lost in an event of an userspace upcall. OVS userspace already requires the commit flag to accept setting ct_mark and/or ct_labels. Validate for this in the kernel API. Signed-off-by: Jarno Rajahalme <jarno@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/openvswitch')
-rw-r--r--net/openvswitch/conntrack.c76
1 files changed, 51 insertions, 25 deletions
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 23fd4fbd11e2..52f3b9b89e97 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -835,6 +835,42 @@ static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
return false;
}
+/* Lookup connection and confirm if unconfirmed. */
+static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
+ const struct ovs_conntrack_info *info,
+ struct sk_buff *skb)
+{
+ int err;
+
+ err = __ovs_ct_lookup(net, key, info, skb);
+ if (err)
+ return err;
+
+ /* Apply changes before confirming the connection so that the initial
+ * conntrack NEW netlink event carries the values given in the CT
+ * action.
+ */
+ if (info->mark.mask) {
+ err = ovs_ct_set_mark(skb, key, info->mark.value,
+ info->mark.mask);
+ if (err)
+ return err;
+ }
+ if (labels_nonzero(&info->labels.mask)) {
+ err = ovs_ct_set_labels(skb, key, &info->labels.value,
+ &info->labels.mask);
+ if (err)
+ return err;
+ }
+ /* This will take care of sending queued events even if the connection
+ * is already confirmed.
+ */
+ if (nf_conntrack_confirm(skb) != NF_ACCEPT)
+ return -EINVAL;
+
+ return 0;
+}
+
/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
* value if 'skb' is freed.
*/
@@ -856,34 +892,10 @@ int ovs_ct_execute(struct net *net, struct sk_buff *skb,
}
if (info->commit)
- err = __ovs_ct_lookup(net, key, info, skb);
+ err = ovs_ct_commit(net, key, info, skb);
else
err = ovs_ct_lookup(net, key, info, skb);
- if (err)
- goto err;
- /* Apply changes before confirming the connection so that the initial
- * conntrack NEW netlink event carries the values given in the CT
- * action.
- */
- if (info->mark.mask) {
- err = ovs_ct_set_mark(skb, key, info->mark.value,
- info->mark.mask);
- if (err)
- goto err;
- }
- if (labels_nonzero(&info->labels.mask)) {
- err = ovs_ct_set_labels(skb, key, &info->labels.value,
- &info->labels.mask);
- if (err)
- goto err;
- }
- /* This will take care of sending queued events even if the connection
- * is already confirmed.
- */
- if (info->commit && nf_conntrack_confirm(skb) != NF_ACCEPT)
- err = -EINVAL;
-err:
skb_push(skb, nh_ofs);
if (err)
kfree_skb(skb);
@@ -1140,6 +1152,20 @@ static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
}
}
+#ifdef CONFIG_NF_CONNTRACK_MARK
+ if (!info->commit && info->mark.mask) {
+ OVS_NLERR(log,
+ "Setting conntrack mark requires 'commit' flag.");
+ return -EINVAL;
+ }
+#endif
+#ifdef CONFIG_NF_CONNTRACK_LABELS
+ if (!info->commit && labels_nonzero(&info->labels.mask)) {
+ OVS_NLERR(log,
+ "Setting conntrack labels requires 'commit' flag.");
+ return -EINVAL;
+ }
+#endif
if (rem > 0) {
OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
return -EINVAL;