openvswitch: Allow matching on conntrack mark

Allow matching and setting the ct_mark field. As with ct_state and
ct_zone, these fields are populated when the CT action is executed. To
write to this field, a value and mask can be specified as a nested
attribute under the CT action. This data is stored with the conntrack
entry, and is executed after the lookup occurs for the CT action. The
conntrack entry itself must be committed using the COMMIT flag in the CT
action flags for this change to persist.

Signed-off-by: Justin Pettit <jpettit@nicira.com>
Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 64 insertions, 3 deletions

diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index 1189fd50f1cf..e53dafccf21f 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -28,12 +28,19 @@ struct ovs_ct_len_tbl {
 	size_t minlen;
 };
 
+/* Metadata mark for masked write to conntrack mark */
+struct md_mark {
+	u32 value;
+	u32 mask;
+};
+
 /* Conntrack action context for execution. */
 struct ovs_conntrack_info {
 	struct nf_conntrack_zone zone;
 	struct nf_conn *ct;
 	u32 flags;
 	u16 family;
+	struct md_mark mark;
 };
 
 static u16 key_to_nfproto(const struct sw_flow_key *key)
@@ -84,10 +91,12 @@ static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
 }
 
 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
-				const struct nf_conntrack_zone *zone)
+				const struct nf_conntrack_zone *zone,
+				const struct nf_conn *ct)
 {
 	key->ct.state = state;
 	key->ct.zone = zone->id;
+	key->ct.mark = ct ? ct->mark : 0;
 }
 
 /* Update 'key' based on skb->nfct. If 'post_ct' is true, then OVS has
@@ -110,7 +119,7 @@ static void ovs_ct_update_key(const struct sk_buff *skb,
 	} else if (post_ct) {
 		state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
 	}
-	__ovs_ct_update_key(key, state, zone);
+	__ovs_ct_update_key(key, state, zone, ct);
 }
 
 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
@@ -127,6 +136,35 @@ int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb)
 	    nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone))
 		return -EMSGSIZE;
 
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
+	    nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
+			   u32 ct_mark, u32 mask)
+{
+	enum ip_conntrack_info ctinfo;
+	struct nf_conn *ct;
+	u32 new_mark;
+
+	if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK))
+		return -ENOTSUPP;
+
+	/* 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;
+		nf_conntrack_event_cache(IPCT_MARK, ct);
+		key->ct.mark = new_mark;
+	}
+
 	return 0;
 }
 
@@ -247,7 +285,7 @@ static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 		u8 state;
 
 		state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
-		__ovs_ct_update_key(key, state, &info->zone);
+		__ovs_ct_update_key(key, state, &info->zone, exp->master);
 	} else {
 		int err;
 
@@ -310,7 +348,13 @@ int ovs_ct_execute(struct net *net, struct sk_buff *skb,
 		err = ovs_ct_commit(net, key, info, skb);
 	else
 		err = ovs_ct_lookup(net, key, info, skb);
+	if (err)
+		goto err;
 
+	if (info->mark.mask)
+		err = ovs_ct_set_mark(skb, key, info->mark.value,
+				      info->mark.mask);
+err:
 	skb_push(skb, nh_ofs);
 	return err;
 }
@@ -320,6 +364,8 @@ static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
 				    .maxlen = sizeof(u32) },
 	[OVS_CT_ATTR_ZONE]	= { .minlen = sizeof(u16),
 				    .maxlen = sizeof(u16) },
+	[OVS_CT_ATTR_MARK]	= { .minlen = sizeof(struct md_mark),
+				    .maxlen = sizeof(struct md_mark) },
 };
 
 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
@@ -355,6 +401,14 @@ static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
 			info->zone.id = nla_get_u16(a);
 			break;
 #endif
+#ifdef CONFIG_NF_CONNTRACK_MARK
+		case OVS_CT_ATTR_MARK: {
+			struct md_mark *mark = nla_data(a);
+
+			info->mark = *mark;
+			break;
+		}
+#endif
 		default:
 			OVS_NLERR(log, "Unknown conntrack attr (%d)",
 				  type);
@@ -377,6 +431,9 @@ bool ovs_ct_verify(enum ovs_key_attr attr)
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
 	    attr == OVS_KEY_ATTR_CT_ZONE)
 		return true;
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
+	    attr == OVS_KEY_ATTR_CT_MARK)
+		return true;
 
 	return false;
 }
@@ -439,6 +496,10 @@ int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
 	    nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
 		return -EMSGSIZE;
+	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
+	    nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
+		    &ct_info->mark))
+		return -EMSGSIZE;
 
 	nla_nest_end(skb, start);