Merge branch 'openvswitch-Conntrack-integration-improvements'

include/uapi/linux/openvswitch.h

 
 /*
- * Copyright (c) 2007-2013 Nicira, Inc.
+ * Copyright (c) 2007-2017 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -331,6 +331,8 @@ enum ovs_key_attr {
 	OVS_KEY_ATTR_CT_ZONE,	/* u16 connection tracking zone. */
 	OVS_KEY_ATTR_CT_MARK,	/* u32 connection tracking mark */
 	OVS_KEY_ATTR_CT_LABELS,	/* 16-octet connection tracking label */
+	OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,   /* struct ovs_key_ct_tuple_ipv4 */
+	OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,   /* struct ovs_key_ct_tuple_ipv6 */
 
 #ifdef __KERNEL__
 	OVS_KEY_ATTR_TUNNEL_INFO,  /* struct ip_tunnel_info */
@@ -446,9 +448,13 @@ struct ovs_key_nd {
 	__u8	nd_tll[ETH_ALEN];
 };
 
-#define OVS_CT_LABELS_LEN	16
+#define OVS_CT_LABELS_LEN_32	4
+#define OVS_CT_LABELS_LEN	(OVS_CT_LABELS_LEN_32 * sizeof(__u32))
 struct ovs_key_ct_labels {
-	__u8	ct_labels[OVS_CT_LABELS_LEN];
+	union {
+		__u8	ct_labels[OVS_CT_LABELS_LEN];
+		__u32	ct_labels_32[OVS_CT_LABELS_LEN_32];
+	};
 };
 
 /* OVS_KEY_ATTR_CT_STATE flags */
@@ -468,6 +474,22 @@ struct ovs_key_ct_labels {
 
 #define OVS_CS_F_NAT_MASK (OVS_CS_F_SRC_NAT | OVS_CS_F_DST_NAT)
 
+struct ovs_key_ct_tuple_ipv4 {
+	__be32 ipv4_src;
+	__be32 ipv4_dst;
+	__be16 src_port;
+	__be16 dst_port;
+	__u8   ipv4_proto;
+};
+
+struct ovs_key_ct_tuple_ipv6 {
+	__be32 ipv6_src[4];
+	__be32 ipv6_dst[4];
+	__be16 src_port;
+	__be16 dst_port;
+	__u8   ipv6_proto;
+};
+
 /**
  * enum ovs_flow_attr - attributes for %OVS_FLOW_* commands.
  * @OVS_FLOW_ATTR_KEY: Nested %OVS_KEY_ATTR_* attributes specifying the flow
@@ -652,6 +674,10 @@ struct ovs_action_hash {
  * @OVS_CT_ATTR_HELPER: variable length string defining conntrack ALG.
  * @OVS_CT_ATTR_NAT: Nested OVS_NAT_ATTR_* for performing L3 network address
  * translation (NAT) on the packet.
+ * @OVS_CT_ATTR_FORCE_COMMIT: Like %OVS_CT_ATTR_COMMIT, but instead of doing
+ * nothing if the connection is already committed will check that the current
+ * packet is in conntrack entry's original direction.  If directionality does
+ * not match, will delete the existing conntrack entry and commit a new one.
  */
 enum ovs_ct_attr {
 	OVS_CT_ATTR_UNSPEC,
@@ -662,6 +688,7 @@ enum ovs_ct_attr {
 	OVS_CT_ATTR_HELPER,     /* netlink helper to assist detection of
 				   related connections. */
 	OVS_CT_ATTR_NAT,        /* Nested OVS_NAT_ATTR_* */
+	OVS_CT_ATTR_FORCE_COMMIT,  /* No argument */
 	__OVS_CT_ATTR_MAX
 };
 

net/openvswitch/actions.c

@@ -1074,6 +1074,8 @@ static int execute_masked_set_action(struct sk_buff *skb,
 	case OVS_KEY_ATTR_CT_ZONE:
 	case OVS_KEY_ATTR_CT_MARK:
 	case OVS_KEY_ATTR_CT_LABELS:
+	case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4:
+	case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6:
 		err = -EINVAL;
 		break;
 	}

net/openvswitch/conntrack.c

@@ -65,6 +65,7 @@ struct ovs_conntrack_info {
 	struct nf_conn *ct;
 	u8 commit : 1;
 	u8 nat : 3;                 /* enum ovs_ct_nat */
+	u8 force : 1;
 	u16 family;
 	struct md_mark mark;
 	struct md_labels labels;
@@ -73,6 +74,8 @@ struct ovs_conntrack_info {
 #endif
 };
 
+static bool labels_nonzero(const struct ovs_key_ct_labels *labels);
+
 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
 
 static u16 key_to_nfproto(const struct sw_flow_key *key)
@@ -129,21 +132,33 @@ static u32 ovs_ct_get_mark(const struct nf_conn *ct)
 #endif
 }
 
+/* Guard against conntrack labels max size shrinking below 128 bits. */
+#if NF_CT_LABELS_MAX_SIZE < 16
+#error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes
+#endif
+
 static void ovs_ct_get_labels(const struct nf_conn *ct,
 			      struct ovs_key_ct_labels *labels)
 {
 	struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
 
-	if (cl) {
-		size_t len = sizeof(cl->bits);
+	if (cl)
+		memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
+	else
+		memset(labels, 0, OVS_CT_LABELS_LEN);
+}
 
-		if (len > OVS_CT_LABELS_LEN)
-			len = OVS_CT_LABELS_LEN;
-		else if (len < OVS_CT_LABELS_LEN)
-			memset(labels, 0, OVS_CT_LABELS_LEN);
-		memcpy(labels, cl->bits, len);
+static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
+					const struct nf_conntrack_tuple *orig,
+					u8 icmp_proto)
+{
+	key->ct_orig_proto = orig->dst.protonum;
+	if (orig->dst.protonum == icmp_proto) {
+		key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
+		key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
 	} else {
-		memset(labels, 0, OVS_CT_LABELS_LEN);
+		key->ct.orig_tp.src = orig->src.u.all;
+		key->ct.orig_tp.dst = orig->dst.u.all;
 	}
 }
 
@@ -151,13 +166,42 @@ static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
 				const struct nf_conntrack_zone *zone,
 				const struct nf_conn *ct)
 {
-	key->ct.state = state;
-	key->ct.zone = zone->id;
+	key->ct_state = state;
+	key->ct_zone = zone->id;
 	key->ct.mark = ovs_ct_get_mark(ct);
 	ovs_ct_get_labels(ct, &key->ct.labels);
+
+	if (ct) {
+		const struct nf_conntrack_tuple *orig;
+
+		/* Use the master if we have one. */
+		if (ct->master)
+			ct = ct->master;
+		orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
+
+		/* IP version must match with the master connection. */
+		if (key->eth.type == htons(ETH_P_IP) &&
+		    nf_ct_l3num(ct) == NFPROTO_IPV4) {
+			key->ipv4.ct_orig.src = orig->src.u3.ip;
+			key->ipv4.ct_orig.dst = orig->dst.u3.ip;
+			__ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
+			return;
+		} else if (key->eth.type == htons(ETH_P_IPV6) &&
+			   !sw_flow_key_is_nd(key) &&
+			   nf_ct_l3num(ct) == NFPROTO_IPV6) {
+			key->ipv6.ct_orig.src = orig->src.u3.in6;
+			key->ipv6.ct_orig.dst = orig->dst.u3.in6;
+			__ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
+			return;
+		}
+	}
+	/* Clear 'ct_orig_proto' to mark the non-existence of conntrack
+	 * original direction key fields.
+	 */
+	key->ct_orig_proto = 0;
 }
 
-/* Update 'key' based on skb->nfct.  If 'post_ct' is true, then OVS has
+/* Update 'key' based on skb->_nfct.  If 'post_ct' is true, then OVS has
  * previously sent the packet to conntrack via the ct action.  If
  * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
  * initialized from the connection status.
@@ -184,7 +228,7 @@ static void ovs_ct_update_key(const struct sk_buff *skb,
 		if (ct->master)
 			state |= OVS_CS_F_RELATED;
 		if (keep_nat_flags) {
-			state |= key->ct.state & OVS_CS_F_NAT_MASK;
+			state |= key->ct_state & OVS_CS_F_NAT_MASK;
 		} else {
 			if (ct->status & IPS_SRC_NAT)
 				state |= OVS_CS_F_SRC_NAT;
@@ -208,44 +252,69 @@ void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
 	ovs_ct_update_key(skb, NULL, key, false, false);
 }
 
-int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb)
+#define IN6_ADDR_INITIALIZER(ADDR) \
+	{ (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \
+	  (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] }
+
+int ovs_ct_put_key(const struct sw_flow_key *swkey,
+		   const struct sw_flow_key *output, struct sk_buff *skb)
 {
-	if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state))
+	if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
 		return -EMSGSIZE;
 
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
-	    nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone))
+	    nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
 		return -EMSGSIZE;
 
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
-	    nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark))
+	    nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark))
 		return -EMSGSIZE;
 
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
-	    nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(key->ct.labels),
-		    &key->ct.labels))
+	    nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels),
+		    &output->ct.labels))
 		return -EMSGSIZE;
 
+	if (swkey->ct_orig_proto) {
+		if (swkey->eth.type == htons(ETH_P_IP)) {
+			struct ovs_key_ct_tuple_ipv4 orig = {
+				output->ipv4.ct_orig.src,
+				output->ipv4.ct_orig.dst,
+				output->ct.orig_tp.src,
+				output->ct.orig_tp.dst,
+				output->ct_orig_proto,
+			};
+			if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
+				    sizeof(orig), &orig))
+				return -EMSGSIZE;
+		} else if (swkey->eth.type == htons(ETH_P_IPV6)) {
+			struct ovs_key_ct_tuple_ipv6 orig = {
+				IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src),
+				IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst),
+				output->ct.orig_tp.src,
+				output->ct.orig_tp.dst,
+				output->ct_orig_proto,
+			};
+			if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
+				    sizeof(orig), &orig))
+				return -EMSGSIZE;
+		}
+	}
+
 	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;
-		nf_conntrack_event_cache(IPCT_MARK, ct);
+		if (nf_ct_is_confirmed(ct))
+			nf_conntrack_event_cache(IPCT_MARK, ct);
 		key->ct.mark = new_mark;
 	}
 
@@ -255,34 +324,80 @@ 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;
-	int err;
-
-	/* 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);
 	}
-	if (!cl || sizeof(cl->bits) < OVS_CT_LABELS_LEN)
+
+	return cl;
+}
+
+/* Initialize labels for a new, yet 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, *master_cl;
+	bool have_mask = labels_nonzero(mask);
+
+	/* Inherit master's labels to the related connection? */
+	master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL;
+
+	if (!master_cl && !have_mask)
+		return 0;   /* Nothing to do. */
+
+	cl = ovs_ct_get_conn_labels(ct);
+	if (!cl)
+		return -ENOSPC;
+
+	/* Inherit the master's labels, if any. */
+	if (master_cl)
+		*cl = *master_cl;
+
+	if (have_mask) {
+		u32 *dst = (u32 *)cl->bits;
+		int i;
+
+		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, (u32 *)labels, (u32 *)mask,
-				    OVS_CT_LABELS_LEN / sizeof(u32));
+	err = nf_connlabels_replace(ct, labels->ct_labels_32,
+				    mask->ct_labels_32,
+				    OVS_CT_LABELS_LEN_32);
 	if (err)
 		return err;
 
-	ovs_ct_get_labels(ct, &key->ct.labels);
+	memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
+
 	return 0;
 }
 
@@ -421,16 +536,16 @@ ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
 
 /* Find an existing connection which this packet belongs to without
  * re-attributing statistics or modifying the connection state.  This allows an
- * skb->nfct lost due to an upcall to be recovered during actions execution.
+ * skb->_nfct lost due to an upcall to be recovered during actions execution.
  *
  * Must be called with rcu_read_lock.
  *
- * On success, populates skb->nfct and skb->nfctinfo, and returns the
- * connection.  Returns NULL if there is no existing entry.
+ * On success, populates skb->_nfct and returns the connection.  Returns NULL
+ * if there is no existing entry.
  */
 static struct nf_conn *
 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
-		     u8 l3num, struct sk_buff *skb)
+		     u8 l3num, struct sk_buff *skb, bool natted)
 {
 	struct nf_conntrack_l3proto *l3proto;
 	struct nf_conntrack_l4proto *l4proto;
@@ -453,6 +568,17 @@ ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
 		return NULL;
 	}
 
+	/* Must invert the tuple if skb has been transformed by NAT. */
+	if (natted) {
+		struct nf_conntrack_tuple inverse;
+
+		if (!nf_ct_invert_tuple(&inverse, &tuple, l3proto, l4proto)) {
+			pr_debug("ovs_ct_find_existing: Inversion failed!\n");
+			return NULL;
+		}
+		tuple = inverse;
+	}
+
 	/* look for tuple match */
 	h = nf_conntrack_find_get(net, zone, &tuple);
 	if (!h)
@@ -460,11 +586,18 @@ ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
 
 	ct = nf_ct_tuplehash_to_ctrack(h);
 
+	/* Inverted packet tuple matches the reverse direction conntrack tuple,
+	 * select the other tuplehash to get the right 'ctinfo' bits for this
+	 * packet.
+	 */
+	if (natted)
+		h = &ct->tuplehash[!h->tuple.dst.dir];
+
 	nf_ct_set(skb, ct, ovs_ct_get_info(h));
 	return ct;
 }
 
-/* Determine whether skb->nfct is equal to the result of conntrack lookup. */
+/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
 static bool skb_nfct_cached(struct net *net,
 			    const struct sw_flow_key *key,
 			    const struct ovs_conntrack_info *info,
@@ -475,14 +608,19 @@ static bool skb_nfct_cached(struct net *net,
 
 	ct = nf_ct_get(skb, &ctinfo);
 	/* If no ct, check if we have evidence that an existing conntrack entry
-	 * might be found for this skb.  This happens when we lose a skb->nfct
+	 * might be found for this skb.  This happens when we lose a skb->_nfct
 	 * due to an upcall.  If the connection was not confirmed, it is not
 	 * cached and needs to be run through conntrack again.
 	 */
-	if (!ct && key->ct.state & OVS_CS_F_TRACKED &&
-	    !(key->ct.state & OVS_CS_F_INVALID) &&
-	    key->ct.zone == info->zone.id)
-		ct = ovs_ct_find_existing(net, &info->zone, info->family, skb);
+	if (!ct && key->ct_state & OVS_CS_F_TRACKED &&
+	    !(key->ct_state & OVS_CS_F_INVALID) &&
+	    key->ct_zone == info->zone.id) {
+		ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
+					  !!(key->ct_state
+					     & OVS_CS_F_NAT_MASK));
+		if (ct)
+			nf_ct_get(skb, &ctinfo);
+	}
 	if (!ct)
 		return false;
 	if (!net_eq(net, read_pnet(&ct->ct_net)))
@@ -496,6 +634,18 @@ static bool skb_nfct_cached(struct net *net,
 		if (help && rcu_access_pointer(help->helper) != info->helper)
 			return false;
 	}
+	/* Force conntrack entry direction to the current packet? */
+	if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
+		/* Delete the conntrack entry if confirmed, else just release
+		 * the reference.
+		 */
+		if (nf_ct_is_confirmed(ct))
+			nf_ct_delete(ct, 0, 0);
+		else
+			nf_conntrack_put(&ct->ct_general);
+		nf_ct_set(skb, NULL, 0);
+		return false;
+	}
 
 	return true;
 }
@@ -590,7 +740,7 @@ static void ovs_nat_update_key(struct sw_flow_key *key,
 	if (maniptype == NF_NAT_MANIP_SRC) {
 		__be16 src;
 
-		key->ct.state |= OVS_CS_F_SRC_NAT;
+		key->ct_state |= OVS_CS_F_SRC_NAT;
 		if (key->eth.type == htons(ETH_P_IP))
 			key->ipv4.addr.src = ip_hdr(skb)->saddr;
 		else if (key->eth.type == htons(ETH_P_IPV6))
@@ -612,7 +762,7 @@ static void ovs_nat_update_key(struct sw_flow_key *key,
 	} else {
 		__be16 dst;
 
-		key->ct.state |= OVS_CS_F_DST_NAT;
+		key->ct_state |= OVS_CS_F_DST_NAT;
 		if (key->eth.type == htons(ETH_P_IP))
 			key->ipv4.addr.dst = ip_hdr(skb)->daddr;
 		else if (key->eth.type == htons(ETH_P_IPV6))
@@ -699,7 +849,7 @@ static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
  * not done already.  Update key with new CT state after passing the packet
  * through conntrack.
- * Note that if the packet is deemed invalid by conntrack, skb->nfct will be
+ * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
  * set to NULL and 0 will be returned.
  */
 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
@@ -736,7 +886,7 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 		 * NAT after the nf_conntrack_in() call.  We can actually clear
 		 * the whole state, as it will be re-initialized below.
 		 */
-		key->ct.state = 0;
+		key->ct_state = 0;
 
 		/* Update the key, but keep the NAT flags. */
 		ovs_ct_update_key(skb, info, key, true, true);
@@ -752,9 +902,9 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
 		 *
 		 * NAT will be done only if the CT action has NAT, and only
 		 * once per packet (per zone), as guarded by the NAT bits in
-		 * the key->ct.state.
+		 * the key->ct_state.
 		 */
-		if (info->nat && !(key->ct.state & OVS_CS_F_NAT_MASK) &&
+		if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
 		    (nf_ct_is_confirmed(ct) || info->commit) &&
 		    ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
 			return -EINVAL;
@@ -830,8 +980,8 @@ static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
 {
 	size_t i;
 
-	for (i = 0; i < sizeof(*labels); i++)
-		if (labels->ct_labels[i])
+	for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
+		if (labels->ct_labels_32[i])
 			return true;
 
 	return false;
@@ -842,24 +992,36 @@ 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,
+	if (!nf_ct_is_confirmed(ct)) {
+		err = ovs_ct_init_labels(ct, key, &info->labels.value,
+					 &info->labels.mask);
+		if (err)
+			return err;
+	} else if (labels_nonzero(&info->labels.mask)) {
+		err = ovs_ct_set_labels(ct, key, &info->labels.value,
 					&info->labels.mask);
 		if (err)
 			return err;
@@ -1061,6 +1223,7 @@ static int parse_nat(const struct nlattr *attr,
 
 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
 	[OVS_CT_ATTR_COMMIT]	= { .minlen = 0, .maxlen = 0 },
+	[OVS_CT_ATTR_FORCE_COMMIT]	= { .minlen = 0, .maxlen = 0 },
 	[OVS_CT_ATTR_ZONE]	= { .minlen = sizeof(u16),
 				    .maxlen = sizeof(u16) },
 	[OVS_CT_ATTR_MARK]	= { .minlen = sizeof(struct md_mark),
@@ -1100,6 +1263,9 @@ static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
 		}
 
 		switch (type) {
+		case OVS_CT_ATTR_FORCE_COMMIT:
+			info->force = true;
+			/* fall through. */
 		case OVS_CT_ATTR_COMMIT:
 			info->commit = true;
 			break;
@@ -1326,7 +1492,9 @@ int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
 	if (!start)
 		return -EMSGSIZE;
 
-	if (ct_info->commit && nla_put_flag(skb, OVS_CT_ATTR_COMMIT))
+	if (ct_info->commit && nla_put_flag(skb, ct_info->force
+					    ? OVS_CT_ATTR_FORCE_COMMIT
+					    : OVS_CT_ATTR_COMMIT))
 		return -EMSGSIZE;
 	if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
 	    nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))

net/openvswitch/conntrack.h

@@ -32,7 +32,8 @@ int ovs_ct_execute(struct net *, struct sk_buff *, struct sw_flow_key *,
 		   const struct ovs_conntrack_info *);
 
 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key);
-int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb);
+int ovs_ct_put_key(const struct sw_flow_key *swkey,
+		   const struct sw_flow_key *output, struct sk_buff *skb);
 void ovs_ct_free_action(const struct nlattr *a);
 
 #define CT_SUPPORTED_MASK (OVS_CS_F_NEW | OVS_CS_F_ESTABLISHED | \
@@ -75,13 +76,18 @@ static inline int ovs_ct_execute(struct net *net, struct sk_buff *skb,
 static inline void ovs_ct_fill_key(const struct sk_buff *skb,
 				   struct sw_flow_key *key)
 {
-	key->ct.state = 0;
-	key->ct.zone = 0;
+	key->ct_state = 0;
+	key->ct_zone = 0;
 	key->ct.mark = 0;
 	memset(&key->ct.labels, 0, sizeof(key->ct.labels));
+	/* Clear 'ct_orig_proto' to mark the non-existence of original
+	 * direction key fields.
+	 */
+	key->ct_orig_proto = 0;
 }
 
-static inline int ovs_ct_put_key(const struct sw_flow_key *key,
+static inline int ovs_ct_put_key(const struct sw_flow_key *swkey,
+				 const struct sw_flow_key *output,
 				 struct sk_buff *skb)
 {
 	return 0;

net/openvswitch/flow.c

@@ -765,7 +765,7 @@ static int key_extract_mac_proto(struct sk_buff *skb)
 int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
 			 struct sk_buff *skb, struct sw_flow_key *key)
 {
-	int res;
+	int res, err;
 
 	/* Extract metadata from packet. */
 	if (tun_info) {
@@ -792,7 +792,6 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
 	key->phy.priority = skb->priority;
 	key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
 	key->phy.skb_mark = skb->mark;
-	ovs_ct_fill_key(skb, key);
 	key->ovs_flow_hash = 0;
 	res = key_extract_mac_proto(skb);
 	if (res < 0)
@@ -800,17 +799,26 @@ int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
 	key->mac_proto = res;
 	key->recirc_id = 0;
 
-	return key_extract(skb, key);
+	err = key_extract(skb, key);
+	if (!err)
+		ovs_ct_fill_key(skb, key);   /* Must be after key_extract(). */
+	return err;
 }
 
 int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
 				   struct sk_buff *skb,
 				   struct sw_flow_key *key, bool log)
 {
+	const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
+	u64 attrs = 0;
 	int err;
 
+	err = parse_flow_nlattrs(attr, a, &attrs, log);
+	if (err)
+		return -EINVAL;
+
 	/* Extract metadata from netlink attributes. */
-	err = ovs_nla_get_flow_metadata(net, attr, key, log);
+	err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
 	if (err)
 		return err;
 
@@ -824,5 +832,21 @@ int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
 	 */
 
 	skb->protocol = key->eth.type;
-	return key_extract(skb, key);
+	err = key_extract(skb, key);
+	if (err)
+		return err;
+
+	/* Check that we have conntrack original direction tuple metadata only
+	 * for packets for which it makes sense.  Otherwise the key may be
+	 * corrupted due to overlapping key fields.
+	 */
+	if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
+	    key->eth.type != htons(ETH_P_IP))
+		return -EINVAL;
+	if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
+	    (key->eth.type != htons(ETH_P_IPV6) ||
+	     sw_flow_key_is_nd(key)))
+		return -EINVAL;
+
+	return 0;
 }

net/openvswitch/flow.h

 /*
- * Copyright (c) 2007-2014 Nicira, Inc.
+ * Copyright (c) 2007-2017 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -85,6 +85,11 @@ struct sw_flow_key {
 		struct vlan_head cvlan;
 		__be16 type;		/* Ethernet frame type. */
 	} eth;
+	/* Filling a hole of two bytes. */
+	u8 ct_state;
+	u8 ct_orig_proto;		/* CT original direction tuple IP
+					 * protocol.
+					 */
 	union {
 		struct {
 			__be32 top_lse;	/* top label stack entry */
@@ -96,6 +101,7 @@ struct sw_flow_key {
 			u8     frag;	/* One of OVS_FRAG_TYPE_*. */
 		} ip;
 	};
+	u16 ct_zone;			/* Conntrack zone. */
 	struct {
 		__be16 src;		/* TCP/UDP/SCTP source port. */
 		__be16 dst;		/* TCP/UDP/SCTP destination port. */
@@ -107,10 +113,16 @@ struct sw_flow_key {
 				__be32 src;	/* IP source address. */
 				__be32 dst;	/* IP destination address. */
 			} addr;
-			struct {
-				u8 sha[ETH_ALEN];	/* ARP source hardware address. */
-				u8 tha[ETH_ALEN];	/* ARP target hardware address. */
-			} arp;
+			union {
+				struct {
+					__be32 src;
+					__be32 dst;
+				} ct_orig;	/* Conntrack original direction fields. */
+				struct {
+					u8 sha[ETH_ALEN];	/* ARP source hardware address. */
+					u8 tha[ETH_ALEN];	/* ARP target hardware address. */
+				} arp;
+			};
 		} ipv4;
 		struct {
 			struct {
@@ -118,23 +130,40 @@ struct sw_flow_key {
 				struct in6_addr dst;	/* IPv6 destination address. */
 			} addr;
 			__be32 label;			/* IPv6 flow label. */
-			struct {
-				struct in6_addr target;	/* ND target address. */
-				u8 sll[ETH_ALEN];	/* ND source link layer address. */
-				u8 tll[ETH_ALEN];	/* ND target link layer address. */
-			} nd;
+			union {
+				struct {
+					struct in6_addr src;
+					struct in6_addr dst;
+				} ct_orig;	/* Conntrack original direction fields. */
+				struct {
+					struct in6_addr target;	/* ND target address. */
+					u8 sll[ETH_ALEN];	/* ND source link layer address. */
+					u8 tll[ETH_ALEN];	/* ND target link layer address. */
+				} nd;
+			};
 		} ipv6;
 	};
 	struct {
-		/* Connection tracking fields. */
-		u16 zone;
+		/* Connection tracking fields not packed above. */
+		struct {
+			__be16 src;	/* CT orig tuple tp src port. */
+			__be16 dst;	/* CT orig tuple tp dst port. */
+		} orig_tp;
 		u32 mark;
-		u8 state;
 		struct ovs_key_ct_labels labels;
 	} ct;
 
 } __aligned(BITS_PER_LONG/8); /* Ensure that we can do comparisons as longs. */
 
+static inline bool sw_flow_key_is_nd(const struct sw_flow_key *key)
+{
+	return key->eth.type == htons(ETH_P_IPV6) &&
+		key->ip.proto == NEXTHDR_ICMP &&
+		key->tp.dst == 0 &&
+		(key->tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
+		 key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT));
+}
+
 struct sw_flow_key_range {
 	unsigned short int start;
 	unsigned short int end;

net/openvswitch/flow_netlink.c

@@ -129,7 +129,9 @@ static bool match_validate(const struct sw_flow_match *match,
 	/* The following mask attributes allowed only if they
 	 * pass the validation tests. */
 	mask_allowed &= ~((1 << OVS_KEY_ATTR_IPV4)
+			| (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)
 			| (1 << OVS_KEY_ATTR_IPV6)
+			| (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)
 			| (1 << OVS_KEY_ATTR_TCP)
 			| (1 << OVS_KEY_ATTR_TCP_FLAGS)
 			| (1 << OVS_KEY_ATTR_UDP)
@@ -161,8 +163,10 @@ static bool match_validate(const struct sw_flow_match *match,
 
 	if (match->key->eth.type == htons(ETH_P_IP)) {
 		key_expected |= 1 << OVS_KEY_ATTR_IPV4;
-		if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
+		if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
 			mask_allowed |= 1 << OVS_KEY_ATTR_IPV4;
+			mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4;
+		}
 
 		if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 			if (match->key->ip.proto == IPPROTO_UDP) {
@@ -196,8 +200,10 @@ static bool match_validate(const struct sw_flow_match *match,
 
 	if (match->key->eth.type == htons(ETH_P_IPV6)) {
 		key_expected |= 1 << OVS_KEY_ATTR_IPV6;
-		if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
+		if (match->mask && match->mask->key.eth.type == htons(0xffff)) {
 			mask_allowed |= 1 << OVS_KEY_ATTR_IPV6;
+			mask_allowed |= 1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6;
+		}
 
 		if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
 			if (match->key->ip.proto == IPPROTO_UDP) {
@@ -230,6 +236,12 @@ static bool match_validate(const struct sw_flow_match *match,
 						htons(NDISC_NEIGHBOUR_SOLICITATION) ||
 				    match->key->tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
 					key_expected |= 1 << OVS_KEY_ATTR_ND;
+					/* Original direction conntrack tuple
+					 * uses the same space as the ND fields
+					 * in the key, so both are not allowed
+					 * at the same time.
+					 */
+					mask_allowed &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
 					if (match->mask && (match->mask->key.tp.src == htons(0xff)))
 						mask_allowed |= 1 << OVS_KEY_ATTR_ND;
 				}
@@ -282,7 +294,7 @@ size_t ovs_key_attr_size(void)
 	/* Whenever adding new OVS_KEY_ FIELDS, we should consider
 	 * updating this function.
 	 */
-	BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 26);
+	BUILD_BUG_ON(OVS_KEY_ATTR_TUNNEL_INFO != 28);
 
 	return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
 		+ nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
@@ -295,6 +307,7 @@ size_t ovs_key_attr_size(void)
 		+ nla_total_size(2)   /* OVS_KEY_ATTR_CT_ZONE */
 		+ nla_total_size(4)   /* OVS_KEY_ATTR_CT_MARK */
 		+ nla_total_size(16)  /* OVS_KEY_ATTR_CT_LABELS */
+		+ nla_total_size(40)  /* OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6 */
 		+ nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
 		+ nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
 		+ nla_total_size(4)   /* OVS_KEY_ATTR_VLAN */
@@ -355,6 +368,10 @@ static const struct ovs_len_tbl ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 	[OVS_KEY_ATTR_CT_ZONE]	 = { .len = sizeof(u16) },
 	[OVS_KEY_ATTR_CT_MARK]	 = { .len = sizeof(u32) },
 	[OVS_KEY_ATTR_CT_LABELS] = { .len = sizeof(struct ovs_key_ct_labels) },
+	[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4] = {
+		.len = sizeof(struct ovs_key_ct_tuple_ipv4) },
+	[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6] = {
+		.len = sizeof(struct ovs_key_ct_tuple_ipv6) },
 };
 
 static bool check_attr_len(unsigned int attr_len, unsigned int expected_len)
@@ -430,9 +447,8 @@ static int parse_flow_mask_nlattrs(const struct nlattr *attr,
 	return __parse_flow_nlattrs(attr, a, attrsp, log, true);
 }
 
-static int parse_flow_nlattrs(const struct nlattr *attr,
-			      const struct nlattr *a[], u64 *attrsp,
-			      bool log)
+int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[],
+		       u64 *attrsp, bool log)
 {
 	return __parse_flow_nlattrs(attr, a, attrsp, log, false);
 }
@@ -1056,14 +1072,14 @@ static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
 			return -EINVAL;
 		}
 
-		SW_FLOW_KEY_PUT(match, ct.state, ct_state, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_state, ct_state, is_mask);
 		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_STATE);
 	}
 	if (*attrs & (1 << OVS_KEY_ATTR_CT_ZONE) &&
 	    ovs_ct_verify(net, OVS_KEY_ATTR_CT_ZONE)) {
 		u16 ct_zone = nla_get_u16(a[OVS_KEY_ATTR_CT_ZONE]);
 
-		SW_FLOW_KEY_PUT(match, ct.zone, ct_zone, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_zone, ct_zone, is_mask);
 		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ZONE);
 	}
 	if (*attrs & (1 << OVS_KEY_ATTR_CT_MARK) &&
@@ -1082,6 +1098,34 @@ static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
 				   sizeof(*cl), is_mask);
 		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_LABELS);
 	}
+	if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4)) {
+		const struct ovs_key_ct_tuple_ipv4 *ct;
+
+		ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4]);
+
+		SW_FLOW_KEY_PUT(match, ipv4.ct_orig.src, ct->ipv4_src, is_mask);
+		SW_FLOW_KEY_PUT(match, ipv4.ct_orig.dst, ct->ipv4_dst, is_mask);
+		SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
+		SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv4_proto, is_mask);
+		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4);
+	}
+	if (*attrs & (1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6)) {
+		const struct ovs_key_ct_tuple_ipv6 *ct;
+
+		ct = nla_data(a[OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6]);
+
+		SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.src, &ct->ipv6_src,
+				   sizeof(match->key->ipv6.ct_orig.src),
+				   is_mask);
+		SW_FLOW_KEY_MEMCPY(match, ipv6.ct_orig.dst, &ct->ipv6_dst,
+				   sizeof(match->key->ipv6.ct_orig.dst),
+				   is_mask);
+		SW_FLOW_KEY_PUT(match, ct.orig_tp.src, ct->src_port, is_mask);
+		SW_FLOW_KEY_PUT(match, ct.orig_tp.dst, ct->dst_port, is_mask);
+		SW_FLOW_KEY_PUT(match, ct_orig_proto, ct->ipv6_proto, is_mask);
+		*attrs &= ~(1ULL << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6);
+	}
 
 	/* For layer 3 packets the Ethernet type is provided
 	 * and treated as metadata but no MAC addresses are provided.
@@ -1493,9 +1537,12 @@ u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
 
 /**
  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
- * @key: Receives extracted in_port, priority, tun_key and skb_mark.
- * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
- * sequence.
+ * @net: Network namespace.
+ * @key: Receives extracted in_port, priority, tun_key, skb_mark and conntrack
+ * metadata.
+ * @a: Array of netlink attributes holding parsed %OVS_KEY_ATTR_* Netlink
+ * attributes.
+ * @attrs: Bit mask for the netlink attributes included in @a.
  * @log: Boolean to allow kernel error logging.  Normally true, but when
  * probing for feature compatibility this should be passed in as false to
  * suppress unnecessary error logging.
@@ -1504,25 +1551,26 @@ u32 ovs_nla_get_ufid_flags(const struct nlattr *attr)
  * take the same form accepted by flow_from_nlattrs(), but only enough of it to
  * get the metadata, that is, the parts of the flow key that cannot be
  * extracted from the packet itself.
+ *
+ * This must be called before the packet key fields are filled in 'key'.
  */
 
-int ovs_nla_get_flow_metadata(struct net *net, const struct nlattr *attr,
-			      struct sw_flow_key *key,
-			      bool log)
+int ovs_nla_get_flow_metadata(struct net *net,
+			      const struct nlattr *a[OVS_KEY_ATTR_MAX + 1],
+			      u64 attrs, struct sw_flow_key *key, bool log)
 {
-	const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
 	struct sw_flow_match match;
-	u64 attrs = 0;
-	int err;
-
-	err = parse_flow_nlattrs(attr, a, &attrs, log);
-	if (err)
-		return -EINVAL;
 
 	memset(&match, 0, sizeof(match));
 	match.key = key;
 
+	key->ct_state = 0;
+	key->ct_zone = 0;
+	key->ct_orig_proto = 0;
 	memset(&key->ct, 0, sizeof(key->ct));
+	memset(&key->ipv4.ct_orig, 0, sizeof(key->ipv4.ct_orig));
+	memset(&key->ipv6.ct_orig, 0, sizeof(key->ipv6.ct_orig));
+
 	key->phy.in_port = DP_MAX_PORTS;
 
 	return metadata_from_nlattrs(net, &match, &attrs, a, false, log);
@@ -1584,7 +1632,7 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
 	if (nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
 		goto nla_put_failure;
 
-	if (ovs_ct_put_key(output, skb))
+	if (ovs_ct_put_key(swkey, output, skb))
 		goto nla_put_failure;
 
 	if (ovs_key_mac_proto(swkey) == MAC_PROTO_ETHERNET) {

net/openvswitch/flow_netlink.h

@@ -46,8 +46,11 @@ void ovs_match_init(struct sw_flow_match *match,
 
 int ovs_nla_put_key(const struct sw_flow_key *, const struct sw_flow_key *,
 		    int attr, bool is_mask, struct sk_buff *);
-int ovs_nla_get_flow_metadata(struct net *, const struct nlattr *,
-			      struct sw_flow_key *, bool log);
+int parse_flow_nlattrs(const struct nlattr *attr, const struct nlattr *a[],
+		       u64 *attrsp, bool log);
+int ovs_nla_get_flow_metadata(struct net *net,
+			      const struct nlattr *a[OVS_KEY_ATTR_MAX + 1],
+			      u64 attrs, struct sw_flow_key *key, bool log);
 
 int ovs_nla_put_identifier(const struct sw_flow *flow, struct sk_buff *skb);
 int ovs_nla_put_masked_key(const struct sw_flow *flow, struct sk_buff *skb);