[ovs-dev] [PATCH net-next V14 3/3] openvswitch: 802.1ad: Flow handling, actions, vlan parsing and netlink attributes

Thomas F Herbert thomasfherbert at gmail.com
Thu Oct 1 03:33:00 UTC 2015


Add support for 802.1ad including the ability to push and pop double
tagged vlans. Add support for 802.1ad to netlink parsing and flow
conversion. Uses double nested encap attributes to represent double
tagged vlan. Inner TPID encoded along with ctci in nested attributes.

Signed-off-by: Thomas F Herbert <thomasfherbert at gmail.com>
---
 net/openvswitch/actions.c      |   4 +-
 net/openvswitch/flow.c         |  87 +++++++++++++++++----
 net/openvswitch/flow.h         |  11 ++-
 net/openvswitch/flow_netlink.c | 167 +++++++++++++++++++++++++++++++++++++----
 net/openvswitch/vport-netdev.c |   4 +-
 5 files changed, 239 insertions(+), 34 deletions(-)

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 315f533..c544371 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -236,7 +236,7 @@ static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 	if (skb_vlan_tag_present(skb))
 		invalidate_flow_key(key);
 	else
-		key->eth.tci = 0;
+		key->eth.vlan.tci = 0;
 	return err;
 }
 
@@ -246,7 +246,7 @@ static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
 	if (skb_vlan_tag_present(skb))
 		invalidate_flow_key(key);
 	else
-		key->eth.tci = vlan->vlan_tci;
+		key->eth.vlan.tci = vlan->vlan_tci;
 	return skb_vlan_push(skb, vlan->vlan_tpid,
 			     ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
 }
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index c8db44a..86a2cb0 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -305,21 +305,78 @@ static bool icmp6hdr_ok(struct sk_buff *skb)
 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
 {
 	struct qtag_prefix {
-		__be16 eth_type; /* ETH_P_8021Q */
+		__be16 eth_type; /* ETH_P_8021Q  or ETH_P_8021AD */
 		__be16 tci;
 	};
-	struct qtag_prefix *qp;
+	struct qtag_prefix *qp = (struct qtag_prefix *)skb->data;
 
-	if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
+	struct qinqtag_prefix {
+		__be16 eth_type; /* ETH_P_8021Q  or ETH_P_8021AD */
+		__be16 tci;
+		__be16 inner_tpid; /* ETH_P_8021Q */
+		__be16 ctci;
+	};
+
+	if (likely(skb_vlan_tag_present(skb))) {
+		key->eth.vlan.tci = htons(skb->vlan_tci);
+		key->eth.vlan.tpid = skb->vlan_proto;
+
+		/* Case where upstream
+		 * processing has already stripped the outer vlan tag.
+		 */
+		if (unlikely(skb->vlan_proto == htons(ETH_P_8021AD))) {
+			if (unlikely(skb->len < sizeof(struct qtag_prefix) +
+					sizeof(__be16))) {
+				key->eth.vlan.tci = 0;
+				return 0;
+			}
+
+			if (unlikely(!pskb_may_pull(skb,
+						    sizeof(struct qtag_prefix) +
+						    sizeof(__be16))))
+				return -ENOMEM;
+
+			key->eth.cvlan.tci =
+				qp->tci | htons(VLAN_TAG_PRESENT);
+			key->eth.cvlan.tpid = qp->eth_type;
+
+			__skb_pull(skb, sizeof(struct qtag_prefix));
+		}
 		return 0;
 
-	if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
-					 sizeof(__be16))))
-		return -ENOMEM;
+	} else if (qp->eth_type == htons(ETH_P_8021AD)) {
+		struct qinqtag_prefix *qinqp =
+					(struct qinqtag_prefix *)skb->data;
+
+		if (unlikely(skb->len < sizeof(struct qinqtag_prefix) +
+					sizeof(__be16)))
+			return 0;
+
+		if (unlikely(!pskb_may_pull(skb, sizeof(struct qinqtag_prefix) +
+				sizeof(__be16))))
+			return -ENOMEM;
+		key->eth.vlan.tci = qinqp->tci | htons(VLAN_TAG_PRESENT);
+		key->eth.vlan.tpid = qp->eth_type;
+		key->eth.cvlan.tci = qinqp->ctci | htons(VLAN_TAG_PRESENT);
+		key->eth.cvlan.tpid = qinqp->inner_tpid;
+
+		__skb_pull(skb, sizeof(struct qinqtag_prefix));
 
-	qp = (struct qtag_prefix *) skb->data;
-	key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
-	__skb_pull(skb, sizeof(struct qtag_prefix));
+		return 0;
+
+	} else if (qp->eth_type == htons(ETH_P_8021Q)) {
+		if (unlikely(skb->len < sizeof(struct qtag_prefix) +
+					sizeof(__be16)))
+			return 0;
+
+		if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
+				sizeof(__be16))))
+			return -ENOMEM;
+		key->eth.vlan.tci = qp->tci | htons(VLAN_TAG_PRESENT);
+		key->eth.vlan.tpid = qp->eth_type;
+
+		__skb_pull(skb, sizeof(struct qtag_prefix));
+	}
 
 	return 0;
 }
@@ -480,12 +537,12 @@ static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
 	 * update skb->csum here.
 	 */
 
-	key->eth.tci = 0;
-	if (skb_vlan_tag_present(skb))
-		key->eth.tci = htons(skb->vlan_tci);
-	else if (eth->h_proto == htons(ETH_P_8021Q))
-		if (unlikely(parse_vlan(skb, key)))
-			return -ENOMEM;
+	key->eth.vlan.tci = 0;
+	key->eth.vlan.tpid = 0;
+	key->eth.cvlan.tci = 0;
+	key->eth.cvlan.tpid = 0;
+	if (unlikely(parse_vlan(skb, key)))
+		return -ENOMEM;
 
 	key->eth.type = parse_ethertype(skb);
 	if (unlikely(key->eth.type == htons(0)))
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index fe527d2..539494e 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -68,7 +68,16 @@ struct sw_flow_key {
 	struct {
 		u8     src[ETH_ALEN];	/* Ethernet source address. */
 		u8     dst[ETH_ALEN];	/* Ethernet destination address. */
-		__be16 tci;		/* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
+		struct {
+			__be16 tpid;	/* Outer Vlan type 802.1q or 802.1ad.*/
+			__be16 tci;	/* 0 if no VLAN, VLAN_TAG_PRESENT */
+					/* set otherwise. */
+		} vlan;
+		struct {
+			__be16 tpid;	/* Inner Vlan DL_type 802.1q.*/
+			__be16 tci;	/* 0 if no CVLAN, VLAN_TAG_PRESENT */
+					/* set otherwise. */
+		} cvlan;
 		__be16 type;		/* Ethernet frame type. */
 	} eth;
 	union {
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index c92d6a2..08f56ab 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -811,6 +811,27 @@ static int metadata_from_nlattrs(struct net *net, struct sw_flow_match *match,
 	return 0;
 }
 
+static int cust_vlan_from_nlattrs(struct sw_flow_match *match,
+				  const struct nlattr *a[],
+				  bool is_mask, bool log)
+{
+	__be16 ctci = 0;
+	__be16 c_tpid = 0;
+
+	ctci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
+	if (!(ctci & htons(VLAN_TAG_PRESENT))) {
+		if (is_mask)
+			OVS_NLERR(log, "VLAN CTCI mask does not have exact match for VLAN_TAG_PRESENT bit.");
+		else
+			OVS_NLERR(log, "VLAN CTCI does not have VLAN_TAG_PRESENT bit set.");
+		return -EINVAL;
+	}
+	c_tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
+	SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, c_tpid, is_mask);
+	SW_FLOW_KEY_PUT(match, eth.cvlan.tci, ctci, is_mask);
+	return 0;
+}
+
 static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
 				u64 attrs, const struct nlattr **a,
 				bool is_mask, bool log)
@@ -845,7 +866,7 @@ static int ovs_key_from_nlattrs(struct net *net, struct sw_flow_match *match,
 			return -EINVAL;
 		}
 
-		SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
+		SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
 		attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
 	}
 
@@ -1064,6 +1085,93 @@ static void mask_set_nlattr(struct nlattr *attr, u8 val)
 	nlattr_set(attr, val, ovs_key_lens);
 }
 
+static int parse_vlan_from_nlattrs(const struct nlattr **nla,
+				   struct sw_flow_match *match,
+				   u64 *key_attrs, bool *ie_valid,
+				   const struct nlattr **a, bool is_mask,
+				   bool log)
+{
+	int err;
+	const struct nlattr *encap;
+
+	if (!is_mask) {
+		u64 v_attrs = 0;
+
+		err = parse_flow_nlattrs(*nla, a, &v_attrs, log);
+		if (err)
+			return err;
+		/* Another encap attribute here indicates
+		 * the presence of a double tagged vlan.
+		 */
+		if ((v_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
+		    eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]))) {
+			if (!((v_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
+			      (v_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
+				OVS_NLERR(log, "Invalid Inner VLAN frame");
+				return -EINVAL;
+			}
+			SW_FLOW_KEY_PUT(match, eth.vlan.tpid,
+					nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]),
+						     is_mask);
+			encap = a[OVS_KEY_ATTR_ENCAP];
+			v_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
+
+			err = cust_vlan_from_nlattrs(match, a, is_mask, log);
+			if (err)
+				return err;
+			*ie_valid = true;
+			*nla = encap;
+
+			/* Insure that tci key attribute isn't
+			 * overwritten by encapsulated customer tci.
+			 * Ethertype is cleared because it is c_tpid.
+			 */
+			v_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
+			v_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
+		}
+		*key_attrs |= v_attrs;
+
+		if (*ie_valid) {
+			err = parse_flow_nlattrs(*nla, a, key_attrs, log);
+			if (err)
+				return err;
+		}
+
+	} else {
+		u64 mask_v_attrs = 0;
+
+		err = parse_flow_mask_nlattrs(*nla, a, &mask_v_attrs, log);
+		if (err)
+			return err;
+
+		if (mask_v_attrs & 1 << OVS_KEY_ATTR_ENCAP) {
+			if (!*ie_valid) {
+				OVS_NLERR(log, "Encap mask attribute is set for non-CVLAN frame.");
+				err = -EINVAL;
+				return err;
+			}
+			encap = a[OVS_KEY_ATTR_ENCAP];
+			mask_v_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
+
+			err = cust_vlan_from_nlattrs(match, a, is_mask, log);
+			if (err)
+				return err;
+			*nla = encap;
+
+			mask_v_attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
+			mask_v_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
+		}
+
+		*key_attrs |= mask_v_attrs;
+		if (*ie_valid) {
+			err = parse_flow_mask_nlattrs(*nla, a, key_attrs, log);
+			if (err)
+				return err;
+		}
+	}
+	return 0;
+}
+
 /**
  * ovs_nla_get_match - parses Netlink attributes into a flow key and
  * mask. In case the 'mask' is NULL, the flow is treated as exact match
@@ -1091,6 +1199,7 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
 	u64 key_attrs = 0;
 	u64 mask_attrs = 0;
 	bool encap_valid = false;
+	bool i_encap_valid = false;
 	int err;
 
 	err = parse_flow_nlattrs(nla_key, a, &key_attrs, log);
@@ -1099,11 +1208,11 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
 
 	if ((key_attrs & (1 << OVS_KEY_ATTR_ETHERNET)) &&
 	    (key_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
-	    (nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q))) {
+	    eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]))) {
 		__be16 tci;
 
-		if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
-		      (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
+		if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
+		      (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
 			OVS_NLERR(log, "Invalid Vlan frame.");
 			return -EINVAL;
 		}
@@ -1115,9 +1224,12 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
 		encap_valid = true;
 
 		if (tci & htons(VLAN_TAG_PRESENT)) {
-			err = parse_flow_nlattrs(encap, a, &key_attrs, log);
+			err = parse_vlan_from_nlattrs(&encap, match, &key_attrs,
+						      &i_encap_valid, a, false,
+						      log);
 			if (err)
 				return err;
+
 		} else if (!tci) {
 			/* Corner case for truncated 802.1Q header. */
 			if (nla_len(encap)) {
@@ -1169,7 +1281,7 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
 			goto free_newmask;
 
 		/* Always match on tci. */
-		SW_FLOW_KEY_PUT(match, eth.tci, htons(0xffff), true);
+		SW_FLOW_KEY_PUT(match, eth.vlan.tci, htons(0xffff), true);
 
 		if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) {
 			__be16 eth_type = 0;
@@ -1188,10 +1300,13 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
 			if (eth_type == htons(0xffff)) {
 				mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
 				encap = a[OVS_KEY_ATTR_ENCAP];
-				err = parse_flow_mask_nlattrs(encap, a,
-							      &mask_attrs, log);
+				err = parse_vlan_from_nlattrs(&encap, match,
+							      &mask_attrs,
+							      &i_encap_valid,
+							      a, true, log);
 				if (err)
 					goto free_newmask;
+
 			} else {
 				OVS_NLERR(log, "VLAN frames must have an exact match on the TPID (mask=%x).",
 					  ntohs(eth_type));
@@ -1320,6 +1435,7 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
 {
 	struct ovs_key_ethernet *eth_key;
 	struct nlattr *nla, *encap;
+	struct nlattr *in_encap = NULL;
 
 	if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
 		goto nla_put_failure;
@@ -1368,17 +1484,36 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
 	ether_addr_copy(eth_key->eth_src, output->eth.src);
 	ether_addr_copy(eth_key->eth_dst, output->eth.dst);
 
-	if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
+	if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) {
 		__be16 eth_type;
-		eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
+
+		eth_type = !is_mask ? output->eth.vlan.tpid : htons(0xffff);
+
 		if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
-		    nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
+		    nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.vlan.tci))
 			goto nla_put_failure;
 		encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
-		if (!swkey->eth.tci)
+		if (!swkey->eth.vlan.tci)
 			goto unencap;
-	} else
+		if (swkey->eth.cvlan.tci) {
+			__be16 eth_type;
+
+			/* Customer tci is nested but uses same key attribute.
+			 */
+			eth_type = !is_mask ? output->eth.cvlan.tpid :
+					      htons(0xffff);
+			if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
+					 eth_type) ||
+			    nla_put_be16(skb, OVS_KEY_ATTR_VLAN,
+					 output->eth.cvlan.tci))
+				goto nla_put_failure;
+			in_encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
+			if (!swkey->eth.cvlan.tci)
+				goto unencap;
+		}
+	} else {
 		encap = NULL;
+	}
 
 	if (swkey->eth.type == htons(ETH_P_802_2)) {
 		/*
@@ -1525,6 +1660,8 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
 unencap:
 	if (encap)
 		nla_nest_end(skb, encap);
+	if (in_encap)
+		nla_nest_end(skb, in_encap);
 
 	return 0;
 
@@ -2174,7 +2311,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
 
 		case OVS_ACTION_ATTR_PUSH_VLAN:
 			vlan = nla_data(a);
-			if (vlan->vlan_tpid != htons(ETH_P_8021Q))
+			if (!eth_type_vlan(vlan->vlan_tpid))
 				return -EINVAL;
 			if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
 				return -EINVAL;
@@ -2279,7 +2416,7 @@ int ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
 
 	(*sfa)->orig_len = nla_len(attr);
 	err = __ovs_nla_copy_actions(net, attr, key, 0, sfa, key->eth.type,
-				     key->eth.tci, log);
+				     key->eth.vlan.tci, log);
 	if (err)
 		ovs_nla_free_flow_actions(*sfa);
 
diff --git a/net/openvswitch/vport-netdev.c b/net/openvswitch/vport-netdev.c
index f7e8dcc..d2581b7 100644
--- a/net/openvswitch/vport-netdev.c
+++ b/net/openvswitch/vport-netdev.c
@@ -194,7 +194,9 @@ static unsigned int packet_length(const struct sk_buff *skb)
 {
 	unsigned int length = skb->len - ETH_HLEN;
 
-	if (skb->protocol == htons(ETH_P_8021Q))
+	if (eth_type_vlan(skb->protocol))
+		length -= VLAN_HLEN;
+	if (skb->protocol == htons(ETH_P_8021AD))
 		length -= VLAN_HLEN;
 
 	return length;
-- 
2.4.3




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