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Message-Id: <1486582330-31152-6-git-send-email-jarno@ovn.org>
Date: Wed, 8 Feb 2017 11:32:06 -0800
From: Jarno Rajahalme <jarno@....org>
To: netdev@...r.kernel.org
Cc: jarno@....org
Subject: [PATCH v2 net-next 5/9] openvswitch: Refactor labels initialization.
Refactoring conntrack labels initialization makes chenges in later
patches easier to review.
Signed-off-by: Jarno Rajahalme <jarno@....org>
---
net/openvswitch/conntrack.c | 104 ++++++++++++++++++++++++++------------------
1 file changed, 62 insertions(+), 42 deletions(-)
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 6e3e5e7..026f4a9 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -229,19 +229,12 @@ int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb)
return 0;
}
-static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
+static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
u32 ct_mark, u32 mask)
{
#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
u32 new_mark;
- /* The connection could be invalid, in which case set_mark is no-op. */
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct)
- return 0;
-
new_mark = ct_mark | (ct->mark & ~(mask));
if (ct->mark != new_mark) {
ct->mark = new_mark;
@@ -256,50 +249,66 @@ static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
#endif
}
-static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key,
- const struct ovs_key_ct_labels *labels,
- const struct ovs_key_ct_labels *mask)
+static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
{
- enum ip_conntrack_info ctinfo;
struct nf_conn_labels *cl;
- struct nf_conn *ct;
-
- /* The connection could be invalid, in which case set_label is no-op.*/
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct)
- return 0;
cl = nf_ct_labels_find(ct);
if (!cl) {
nf_ct_labels_ext_add(ct);
cl = nf_ct_labels_find(ct);
}
+
+ return cl;
+}
+
+/* Initialize labels for a new, to be committed conntrack entry. Note that
+ * since the new connection is not yet confirmed, and thus no-one else has
+ * access to it's labels, we simply write them over. Also, we refrain from
+ * triggering events, as receiving change events before the create event would
+ * be confusing.
+ */
+static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
+ const struct ovs_key_ct_labels *labels,
+ const struct ovs_key_ct_labels *mask)
+{
+ struct nf_conn_labels *cl;
+ u32 *dst;
+ int i;
+
+ cl = ovs_ct_get_conn_labels(ct);
if (!cl)
return -ENOSPC;
- if (nf_ct_is_confirmed(ct)) {
- /* Triggers a change event, which makes sense only for
- * confirmed connections.
- */
- int err = nf_connlabels_replace(ct, labels->ct_labels_32,
- mask->ct_labels_32,
- OVS_CT_LABELS_LEN_32);
- if (err)
- return err;
- } else {
- u32 *dst = (u32 *)cl->bits;
- int i;
+ dst = (u32 *)cl->bits;
+ for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
+ dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
+ (labels->ct_labels_32[i] & mask->ct_labels_32[i]);
- /* No-one else has access to the non-confirmed entry, copy
- * labels over, keeping any bits we are not explicitly setting.
- */
- for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
- dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
- (labels->ct_labels_32[i] &
- mask->ct_labels_32[i]);
- }
+ memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
+
+ return 0;
+}
+
+static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
+ const struct ovs_key_ct_labels *labels,
+ const struct ovs_key_ct_labels *mask)
+{
+ struct nf_conn_labels *cl;
+ int err;
+
+ cl = ovs_ct_get_conn_labels(ct);
+ if (!cl)
+ return -ENOSPC;
+
+ err = nf_connlabels_replace(ct, labels->ct_labels_32,
+ mask->ct_labels_32,
+ OVS_CT_LABELS_LEN_32);
+ if (err)
+ return err;
+
+ memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
- ovs_ct_get_labels(ct, &key->ct.labels);
return 0;
}
@@ -881,25 +890,36 @@ static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
const struct ovs_conntrack_info *info,
struct sk_buff *skb)
{
+ enum ip_conntrack_info ctinfo;
+ struct nf_conn *ct;
int err;
err = __ovs_ct_lookup(net, key, info, skb);
if (err)
return err;
+ /* The connection could be invalid, in which case this is a no-op.*/
+ ct = nf_ct_get(skb, &ctinfo);
+ if (!ct)
+ return 0;
+
/* 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,
+ err = ovs_ct_set_mark(ct, 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 (!nf_ct_is_confirmed(ct))
+ err = ovs_ct_init_labels(ct, key, &info->labels.value,
+ &info->labels.mask);
+ else
+ err = ovs_ct_set_labels(ct, key, &info->labels.value,
+ &info->labels.mask);
if (err)
return err;
}
--
2.1.4
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