[PATCH net-next V19 0/3] openvswitch: Add support for 802.1ad

[PATCH net-next V19 0/3] openvswitch: Add support for 802.1ad

[Thomas F Herbert]

V19: Rebased to latest net-next 4.3.0-rc6+
commit 6d08f617872cc048173d59f1ce4660b030bab5a6
plus a few reviewer's suggested changes.

Note: changes to netdev-vport.c are not included. dev_queue_xmit() is
now called directly as the send vport ops function and length
adjustments for vlans don't apply. I have concerns whether this is
correct but haven't review all the vport code. Reviewer's comments
are welcome.

V18: Patches 1 and 2 in this series have been acked from V17.

Patch 3 in the series includes some significant changes.
The patch includes fixes the decoding of the flow for the
outer tpid. Also, netlink parsing code has been consolidated to generalize
inner and outer vlans and non-mask and masked cases as much as possible.

V17,V16: Implement reviewer's comments.

V15: Implement reviewer comments.

V14: Add outer tpid to flow_key

V13: Fix incorrect encoding and decoding of netlink to/from key
attributes.

V12: Fix some problems and issues pointed out by reviewers. When parsing
netlink attributes Ether types other then 0x88a8 as outer tpid.

V11: Add inner tpid to flow key. Fix separate inner encap attribute
when parsing netlink attributes. Merge 2 patches to consolidate
qinq changes.

V10: Implement reviewer comments: Consolidate vlan parsing functions.
Splits netlink parsing and flow conversion into a separate patch. Uses
double encap attribute encapsulation for 802.1ad.  Netlink attributes
now look like this:

    eth_type(0x88a8),vlan(vid=100),encap(eth_type(0x8100), vlan(vid=200),
                             encap(eth_type(0x0800), ...))

The double encap atributes in this version of the patch is incompatible with
old versions of the user level 802.1ad patch. A new user level patch which
is also being submitted simultaneously to openvswitch dev mailing list.

V9:  Includes changes suggested by reviewers

V8:  Includes changes suggested by reviewers

V7:  Includes changes suggested by reviewers

V6:  Rebased to net-next

V5:  Use encapsulated attributes


For discussion, history  and previous versions of the kernel module
patch and the user code patch see the OVS dev mailing list,
openvswitch.org/pipermail/dev/..

Thomas F Herbert (3):
  openvswitch: 802.1ad uapi changes.
  Check for vlan ethernet types for 8021.q or 802.1ad
  802.1AD: Flow handling, actions, vlan parsing and netlink attributes

 include/linux/if_vlan.h          |  16 +++
 include/uapi/linux/openvswitch.h |  17 +--
 net/openvswitch/actions.c        |   6 +-
 net/openvswitch/flow.c           |  76 ++++++++++---
 net/openvswitch/flow.h           |   8 +-
 net/openvswitch/flow_netlink.c   | 235 ++++++++++++++++++++++++++++++---------
 6 files changed, 276 insertions(+), 82 deletions(-)

-- 
2.4.3

_______________________________________________
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http://openvswitch.org/mailman/listinfo/dev

[PATCH net-next V19 1/3] openvswitch: 802.1ad uapi changes.

[Thomas F Herbert]

openvswitch: Add support for 8021.AD

Change the description of the VLAN tpid field.

Signed-off-by: Thomas F Herbert <thomasfherbert@gmail.com>
---
 include/uapi/linux/openvswitch.h | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
index 28ccedd..2e7339d 100644
--- a/include/uapi/linux/openvswitch.h
+++ b/include/uapi/linux/openvswitch.h
@@ -587,13 +587,13 @@ struct ovs_action_push_mpls {
  * @vlan_tci: Tag control identifier (TCI) to push.  The CFI bit must be set
  * (but it will not be set in the 802.1Q header that is pushed).
  *
- * The @vlan_tpid value is typically %ETH_P_8021Q.  The only acceptable TPID
- * values are those that the kernel module also parses as 802.1Q headers, to
- * prevent %OVS_ACTION_ATTR_PUSH_VLAN followed by %OVS_ACTION_ATTR_POP_VLAN
- * from having surprising results.
+ * The @vlan_tpid value is typically %ETH_P_8021Q or %ETH_P_8021AD.
+ * The only acceptable TPID values are those that the kernel module also parses
+ * as 802.1Q or 802.1AD headers, to prevent %OVS_ACTION_ATTR_PUSH_VLAN followed
+ * by %OVS_ACTION_ATTR_POP_VLAN from having surprising results.
  */
 struct ovs_action_push_vlan {
-	__be16 vlan_tpid;	/* 802.1Q TPID. */
+	__be16 vlan_tpid;	/* 802.1Q or 802.1ad TPID. */
 	__be16 vlan_tci;	/* 802.1Q TCI (VLAN ID and priority). */
 };
 
@@ -661,9 +661,10 @@ enum ovs_ct_attr {
  * is copied from the value to the packet header field, rest of the bits are
  * left unchanged.  The non-masked value bits must be passed in as zeroes.
  * Masking is not supported for the %OVS_KEY_ATTR_TUNNEL attribute.
- * @OVS_ACTION_ATTR_PUSH_VLAN: Push a new outermost 802.1Q header onto the
- * packet.
- * @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q header off the packet.
+ * @OVS_ACTION_ATTR_PUSH_VLAN: Push a new outermost 802.1Q or 802.1ad header
+ * onto the packet.
+ * @OVS_ACTION_ATTR_POP_VLAN: Pop the outermost 802.1Q or 802.1ad header
+ * from the packet.
  * @OVS_ACTION_ATTR_SAMPLE: Probabilitically executes actions, as specified in
  * the nested %OVS_SAMPLE_ATTR_* attributes.
  * @OVS_ACTION_ATTR_PUSH_MPLS: Push a new MPLS label stack entry onto the
-- 
2.4.3

[PATCH net-next V19 2/3] Check for vlan ethernet types for 8021.q or 802.1ad

[Thomas F Herbert]

This is to simplify using double tagged vlans. This function allows all
valid vlan ethertypes to be checked in a single function call.

Signed-off-by: Thomas F Herbert <thomasfherbert@gmail.com>
---
 include/linux/if_vlan.h | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h
index 67ce5bd..d2494b5 100644
--- a/include/linux/if_vlan.h
+++ b/include/linux/if_vlan.h
@@ -627,6 +627,22 @@ static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
 
 	return features;
 }
+/**
+ * eth_type_vlan - check for valid vlan ether type.
+ * @ethertype: ether type to check
+ *
+ * Returns true if the ether type is a vlan ether type.
+ */
+static inline bool eth_type_vlan(__be16 ethertype)
+{
+	switch (ethertype) {
+	case htons(ETH_P_8021Q):
+	case htons(ETH_P_8021AD):
+		return true;
+	default:
+		return false;
+	}
+}
 
 /**
  * compare_vlan_header - Compare two vlan headers
-- 
2.4.3

[PATCH net-next V19 3/3] openvswitch: 802.1AD: Flow handling, actions, vlan parsing and netlink attributes

[Thomas F Herbert]

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@gmail.com>
---
 net/openvswitch/actions.c      |   6 +-
 net/openvswitch/flow.c         |  76 +++++++++----
 net/openvswitch/flow.h         |   8 +-
 net/openvswitch/flow_netlink.c | 235 +++++++++++++++++++++++++++++++----------
 4 files changed, 251 insertions(+), 74 deletions(-)

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 221fa8b..2b4d001 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -236,7 +236,8 @@ 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;
+		key->eth.vlan.tpid = 0;
 	return err;
 }
 
@@ -246,7 +247,8 @@ 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;
+		key->eth.vlan.tpid = vlan->vlan_tpid;
 	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 0ea128e..e8d6bba 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -302,24 +302,68 @@ static bool icmp6hdr_ok(struct sk_buff *skb)
 				  sizeof(struct icmp6hdr));
 }
 
-static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
+/* Parse vlan tag from vlan header.
+ * Returns ERROR on memory error.
+ * Returns 0 if it encounters a non-vlan or incomplete packet.
+ * Returns 1 after successfully parsing vlan tag.
+ */
+
+static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *vlan)
 {
-	struct qtag_prefix {
-		__be16 eth_type; /* ETH_P_8021Q */
-		__be16 tci;
-	};
-	struct qtag_prefix *qp;
+	struct vlan_head *qp = (struct vlan_head *)skb->data;
+
+	if (likely(!eth_type_vlan(qp->tpid)))
+		return 0;
 
-	if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
+	if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
 		return 0;
 
-	if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
-					 sizeof(__be16))))
+	if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
+				 sizeof(__be16))))
 		return -ENOMEM;
 
-	qp = (struct qtag_prefix *) skb->data;
-	key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
-	__skb_pull(skb, sizeof(struct qtag_prefix));
+	vlan->tci = qp->tci | htons(VLAN_TAG_PRESENT);
+	vlan->tpid = qp->tpid;
+
+	__skb_pull(skb, sizeof(struct vlan_head));
+	return 1;
+}
+
+static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	int res;
+
+	key->eth.vlan.tci = 0;
+	key->eth.vlan.tpid = 0;
+	key->eth.cvlan.tci = 0;
+	key->eth.cvlan.tpid = 0;
+
+	if (likely(skb_vlan_tag_present(skb))) {
+		key->eth.vlan.tci = htons(skb->vlan_tci);
+		key->eth.vlan.tpid = skb->vlan_proto;
+
+		/* Case where ingress processing has already stripped
+		 * the outer vlan tag.
+		 */
+		res = parse_vlan_tag(skb, &key->eth.cvlan);
+		if (res < 0)
+			return res;
+		/* For inner tag, return 0 because neither
+		 * non-existent nor partial inner tag is an error.
+		 */
+		return 0;
+	}
+	res = parse_vlan_tag(skb, &key->eth.vlan);
+	if (res <= 0)
+		/* This is an outer tag in the non-accelerated VLAN
+		 * case. Return error unless it is a complete vlan tag.
+		 */
+		return res;
+
+	/* Parse inner vlan tag if present for non-accelerated case. */
+	res = parse_vlan_tag(skb, &key->eth.cvlan);
+	if (res <= 0)
+		return res;
 
 	return 0;
 }
@@ -480,12 +524,8 @@ 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;
+	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 1d055c5..97821dd 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -50,6 +50,11 @@ struct ovs_tunnel_info {
 	struct metadata_dst	*tun_dst;
 };
 
+struct vlan_head {
+	__be16 tpid;	/* Vlan type. Generally 802.1q or 802.1ad.*/
+	__be16 tci;	/* 0 if no VLAN, VLAN_TAG_PRESENT set otherwise. */
+};
+
 #define OVS_SW_FLOW_KEY_METADATA_SIZE			\
 	(offsetof(struct sw_flow_key, recirc_id) +	\
 	FIELD_SIZEOF(struct sw_flow_key, recirc_id))
@@ -69,7 +74,8 @@ 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 vlan_head vlan;
+		struct vlan_head cvlan;
 		__be16 type;		/* Ethernet frame type. */
 	} eth;
 	union {
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index 907d6fd..69fd33a 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -934,7 +934,7 @@ 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);
 	}
 
@@ -1159,6 +1159,146 @@ static void mask_set_nlattr(struct nlattr *attr, u8 val)
 	nlattr_set(attr, val, ovs_key_lens);
 }
 
+static int encode_vlan_from_nlattrs(struct sw_flow_match *match,
+				    const struct nlattr *a[],
+				    bool is_mask, bool inner, bool log)
+{
+	__be16 tci = 0;
+	__be16 tpid = 0;
+
+	if (a[OVS_KEY_ATTR_VLAN])
+		tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
+
+	if (a[OVS_KEY_ATTR_ETHERTYPE])
+		tpid = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
+
+	if (is_mask && tpid != htons(0xffff)) {
+		if (likely(!inner))
+			OVS_NLERR(log, "VLAN frames must have an exact match on the TPID (mask=%x).",
+				  ntohs(tpid));
+		else
+			OVS_NLERR(log, "VLAN frames must have an exact match on the CTPID (mask=%x).",
+				  ntohs(tpid));
+		return -EINVAL;
+	}
+	if (!(tci & htons(VLAN_TAG_PRESENT))) {
+		if (is_mask)
+			if (likely(!inner))
+				OVS_NLERR(log, "VLAN TCI mask does not have exact match for VLAN_TAG_PRESENT bit.");
+			else
+				OVS_NLERR(log, "VLAN CTCI mask does not have exact match for VLAN_TAG_PRESENT bit.");
+		else
+			if (likely(!inner))
+				OVS_NLERR(log, "VLAN TCI does not have VLAN_TAG_PRESENT bit set.");
+			else
+				OVS_NLERR(log, "VLAN CTCI does not have VLAN_TAG_PRESENT bit set.");
+		return -EINVAL;
+	}
+	if (likely(!inner)) {
+		SW_FLOW_KEY_PUT(match, eth.vlan.tpid, tpid, is_mask);
+		SW_FLOW_KEY_PUT(match, eth.vlan.tci, tci, is_mask);
+	} else {
+		SW_FLOW_KEY_PUT(match, eth.cvlan.tpid, tpid, is_mask);
+		SW_FLOW_KEY_PUT(match, eth.cvlan.tci, tci, is_mask);
+	}
+	return 0;
+}
+
+static int __parse_vlan_from_nlattrs(const struct nlattr **nla,
+				     struct sw_flow_match *match,
+				     u64 *key_attrs, bool inner,
+				     const struct nlattr **a, bool is_mask,
+				     bool log)
+{
+	int err;
+	u64 v_attrs = *key_attrs;
+
+	err = encode_vlan_from_nlattrs(match, a, is_mask, inner, log);
+	if (err)
+		return err;
+
+	v_attrs &= ~(1 << OVS_KEY_ATTR_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;
+
+	return 0;
+}
+
+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;
+	u64 v_attrs = 0;
+
+	if (!is_mask) {
+		err = __parse_vlan_from_nlattrs(nla, match, key_attrs,
+						false, a, is_mask, log);
+		if (err)
+			return err;
+
+		/* Another encap attribute here indicates
+		 * the presence of a double tagged vlan.
+		 */
+		encap = a[OVS_KEY_ATTR_ENCAP];
+
+		err = parse_flow_nlattrs(encap, a, &v_attrs, log);
+		if (err)
+			return err;
+
+		if ((v_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
+		    eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]))) {
+			if (!((v_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
+			      (v_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
+				OVS_NLERR(log, "Invalid Inner VLAN frame");
+				return -EINVAL;
+			}
+			*ie_valid = true;
+			err = __parse_vlan_from_nlattrs(&encap, match, &v_attrs,
+							true, a, is_mask, log);
+			if (err)
+				return err;
+			*key_attrs |= v_attrs;
+		}
+	} else {
+		err = __parse_vlan_from_nlattrs(nla, match, key_attrs,
+						false, a, is_mask, log);
+		if (err)
+			return err;
+
+		encap = a[OVS_KEY_ATTR_ENCAP];
+
+		err = parse_flow_nlattrs(encap, a, &v_attrs, log);
+		if (err)
+			return err;
+
+		if (v_attrs & (1 << OVS_KEY_ATTR_ENCAP)) {
+			if (!*ie_valid) {
+				OVS_NLERR(log, "Encap mask attribute is set for non-CVLAN frame.");
+				return -EINVAL;
+			}
+			err = __parse_vlan_from_nlattrs(nla, match,
+							&v_attrs, true, a,
+							is_mask,
+							log);
+			if (err)
+				return err;
+			*key_attrs |= v_attrs;
+		}
+	}
+	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
@@ -1186,6 +1326,7 @@ 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);
@@ -1194,8 +1335,7 @@ 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))) {
-		__be16 tci;
+	    eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]))) {
 
 		if (!((key_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
 		      (key_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
@@ -1203,26 +1343,15 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
 			return -EINVAL;
 		}
 
-		key_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
-		tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
 		encap = a[OVS_KEY_ATTR_ENCAP];
-		key_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
 		encap_valid = true;
 
-		if (tci & htons(VLAN_TAG_PRESENT)) {
-			err = parse_flow_nlattrs(encap, a, &key_attrs, log);
-			if (err)
-				return err;
-		} else if (!tci) {
-			/* Corner case for truncated 802.1Q header. */
-			if (nla_len(encap)) {
-				OVS_NLERR(log, "Truncated 802.1Q header has non-zero encap attribute.");
-				return -EINVAL;
-			}
-		} else {
-			OVS_NLERR(log, "Encap attr is set for non-VLAN frame");
-			return  -EINVAL;
-		}
+		err = parse_vlan_from_nlattrs(&encap, match,
+					      &key_attrs,
+					      &i_encap_valid, a, false,
+					      log);
+		if (err)
+			return err;
 	}
 
 	err = ovs_key_from_nlattrs(net, match, key_attrs, a, false, log);
@@ -1264,11 +1393,11 @@ 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);
+		SW_FLOW_KEY_PUT(match, eth.cvlan.tci, htons(0xffff), true);
 
 		if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) {
 			__be16 eth_type = 0;
-			__be16 tci = 0;
 
 			if (!encap_valid) {
 				OVS_NLERR(log, "Encap mask attribute is set for non-VLAN frame.");
@@ -1280,29 +1409,14 @@ int ovs_nla_get_match(struct net *net, struct sw_flow_match *match,
 			if (a[OVS_KEY_ATTR_ETHERTYPE])
 				eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
 
-			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);
-				if (err)
-					goto free_newmask;
-			} else {
-				OVS_NLERR(log, "VLAN frames must have an exact match on the TPID (mask=%x).",
-					  ntohs(eth_type));
-				err = -EINVAL;
-				goto free_newmask;
-			}
-
-			if (a[OVS_KEY_ATTR_VLAN])
-				tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
-
-			if (!(tci & htons(VLAN_TAG_PRESENT))) {
-				OVS_NLERR(log, "VLAN tag present bit must have an exact match (tci_mask=%x).",
-					  ntohs(tci));
-				err = -EINVAL;
+			mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
+			encap = a[OVS_KEY_ATTR_ENCAP];
+			err = parse_vlan_from_nlattrs(&nla_mask, match,
+						      &mask_attrs,
+						      &i_encap_valid,
+						      a, true, log);
+			if (err)
 				goto free_newmask;
-			}
 		}
 
 		err = ovs_key_from_nlattrs(net, match, mask_attrs, a, true,
@@ -1415,6 +1529,7 @@ 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;
@@ -1463,17 +1578,29 @@ 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)) {
-		__be16 eth_type;
-		eth_type = !is_mask ? htons(ETH_P_8021Q) : htons(0xffff);
-		if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
-		    nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
+	if (swkey->eth.vlan.tci || eth_type_vlan(swkey->eth.type)) {
+		if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
+				 output->eth.vlan.tpid) ||
+		    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;
+		if (swkey->eth.cvlan.tci) {
+			/* Customer tci is nested but uses same key attribute.
+			 */
+			if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE,
+					 output->eth.cvlan.tpid) ||
+			    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);
+		} else {
 			goto unencap;
-	} else
+		}
+	} else {
 		encap = NULL;
+	}
 
 	if (swkey->eth.type == htons(ETH_P_802_2)) {
 		/*
@@ -1618,6 +1745,8 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
 	}
 
 unencap:
+	if (in_encap)
+		nla_nest_end(skb, in_encap);
 	if (encap)
 		nla_nest_end(skb, encap);
 
@@ -2270,7 +2399,7 @@ 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;
@@ -2375,7 +2504,7 @@ 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);
 
-- 
2.4.3

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Re: [PATCH net-next V19 0/3] openvswitch: Add support for 802.1ad

[Pravin Shelar]

On Fri, Oct 30, 2015 at 10:08 AM, Thomas F Herbert
<thomasfherbert@gmail.com> wrote:
> V19: Rebased to latest net-next 4.3.0-rc6+
> commit 6d08f617872cc048173d59f1ce4660b030bab5a6
> plus a few reviewer's suggested changes.
>
> Note: changes to netdev-vport.c are not included. dev_queue_xmit() is
> now called directly as the send vport ops function and length
> adjustments for vlans don't apply. I have concerns whether this is
> correct but haven't review all the vport code. Reviewer's comments
> are welcome.
>
dev_queue_xmit is effectively called from ovs_vport_send. vlan len
check can be done in this ovs_vport_send() function.
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Re: [PATCH net-next V19 3/3] openvswitch: 802.1AD: Flow handling, actions, vlan parsing and netlink attributes

[Pravin Shelar]

On Fri, Oct 30, 2015 at 10:08 AM, Thomas F Herbert
<thomasfherbert@gmail.com> wrote:
> 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@gmail.com>
> ---
>  net/openvswitch/actions.c      |   6 +-
>  net/openvswitch/flow.c         |  76 +++++++++----
>  net/openvswitch/flow.h         |   8 +-
>  net/openvswitch/flow_netlink.c | 235 +++++++++++++++++++++++++++++++----------
>  4 files changed, 251 insertions(+), 74 deletions(-)
>
...
...
> +
> +static int __parse_vlan_from_nlattrs(const struct nlattr **nla,
> +                                    struct sw_flow_match *match,
> +                                    u64 *key_attrs, bool inner,
> +                                    const struct nlattr **a, bool is_mask,
> +                                    bool log)
> +{
**nla is unused argument in this function.

> +       int err;
> +       u64 v_attrs = *key_attrs;
> +
> +       err = encode_vlan_from_nlattrs(match, a, is_mask, inner, log);
> +       if (err)
> +               return err;
> +
> +       v_attrs &= ~(1 << OVS_KEY_ATTR_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;
> +
> +       return 0;
> +}
> +
> +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)
> +{
encap passed by reference here, but caller does not make use of this,
So we can just pass pointer to encap.
> +       int err;
> +       const struct nlattr *encap;
> +       u64 v_attrs = 0;
> +
> +       if (!is_mask) {
> +               err = __parse_vlan_from_nlattrs(nla, match, key_attrs,
> +                                               false, a, is_mask, log);
> +               if (err)
> +                       return err;
> +
> +               /* Another encap attribute here indicates
> +                * the presence of a double tagged vlan.
> +                */
> +               encap = a[OVS_KEY_ATTR_ENCAP];
> +
> +               err = parse_flow_nlattrs(encap, a, &v_attrs, log);
> +               if (err)
> +                       return err;
> +
> +               if ((v_attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) &&
> +                   eth_type_vlan(nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]))) {
> +                       if (!((v_attrs & (1 << OVS_KEY_ATTR_VLAN)) &&
> +                             (v_attrs & (1 << OVS_KEY_ATTR_ENCAP)))) {
> +                               OVS_NLERR(log, "Invalid Inner VLAN frame");
> +                               return -EINVAL;
> +                       }
> +                       *ie_valid = true;
> +                       err = __parse_vlan_from_nlattrs(&encap, match, &v_attrs,
> +                                                       true, a, is_mask, log);

__parse_vlan_from_nlattrs() is not parsing inner encap nlattr in this
case. If we move above call to parse_flow_nlattrs() to
__parse_vlan_from_nlattrs() we can fix this issue.

> +                       if (err)
> +                               return err;
> +                       *key_attrs |= v_attrs;
> +               }
> +       } else {
> +               err = __parse_vlan_from_nlattrs(nla, match, key_attrs,
> +                                               false, a, is_mask, log);
> +               if (err)
> +                       return err;
> +
> +               encap = a[OVS_KEY_ATTR_ENCAP];
> +
> +               err = parse_flow_nlattrs(encap, a, &v_attrs, log);
> +               if (err)
> +                       return err;
> +
> +               if (v_attrs & (1 << OVS_KEY_ATTR_ENCAP)) {
> +                       if (!*ie_valid) {
> +                               OVS_NLERR(log, "Encap mask attribute is set for non-CVLAN frame.");
> +                               return -EINVAL;
> +                       }
> +                       err = __parse_vlan_from_nlattrs(nla, match,
> +                                                       &v_attrs, true, a,
> +                                                       is_mask,
> +                                                       log);
> +                       if (err)
> +                               return err;
> +                       *key_attrs |= v_attrs;
> +               }
> +       }
> +       return 0;
> +}
> +