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Message-Id: <1433267444-26025-5-git-send-email-thomasfherbert@gmail.com>
Date: Tue, 2 Jun 2015 13:50:44 -0400
From: Thomas F Herbert <thomasfherbert@...il.com>
To: netdev@...r.kernel.org, pshelar@...ira.com
Cc: therbert@...hat.com, dev@...nvswitch.org,
Thomas F Herbert <thomasfherbert@...il.com>
Subject: [PATCH net-next V10 4/4] 8021AD: Flow key parsing and netlink attributes.
Add support for 802.1ad to netlink parsing and flow conversation. Uses
double nested encap attributes to represent double tagged vlan.
Signed-off-by: Thomas F Herbert <thomasfherbert@...il.com>
---
net/openvswitch/flow_netlink.c | 186 ++++++++++++++++++++++++++++++++++-------
1 file changed, 157 insertions(+), 29 deletions(-)
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index c691b1a..8fd4f63 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -771,6 +771,28 @@ static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs,
return 0;
}
+static int cust_vlan_from_nlattrs(struct sw_flow_match *match, u64 attrs,
+ const struct nlattr **a, bool is_mask,
+ bool log)
+{
+ /* This should be nested inner or "customer" tci" */
+ if (attrs & (1 << OVS_KEY_ATTR_VLAN)) {
+ __be16 ctci;
+
+ 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;
+ }
+ SW_FLOW_KEY_PUT(match, eth.ctci, ctci, is_mask);
+ }
+ return 0;
+}
+
static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
const struct nlattr **a, bool is_mask,
bool log)
@@ -1024,6 +1046,105 @@ 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;
+ __be16 tci;
+ const struct nlattr *encap;
+
+ if (!is_mask) {
+ u64 v_attrs = 0;
+
+ tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
+
+ if (tci & htons(VLAN_TAG_PRESENT)) {
+ if (unlikely((nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) ==
+ htons(ETH_P_8021AD)))) {
+ err = parse_flow_nlattrs(nla, a, &v_attrs, log);
+ if (err)
+ return err;
+ if (!v_attrs)
+ return -EINVAL;
+
+ if (!((v_attrs &
+ (1ULL << OVS_KEY_ATTR_VLAN)) &&
+ (v_attrs &
+ (1ULL << OVS_KEY_ATTR_ENCAP)))) {
+ OVS_NLERR(log, "Invalid Vlan frame.");
+ return -EINVAL;
+ }
+ v_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
+ encap = a[OVS_KEY_ATTR_ENCAP];
+ v_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP);
+ *ie_valid = true;
+
+ err = cust_vlan_from_nlattrs(match, v_attrs,
+ &encap, is_mask,
+ log);
+ if (err)
+ return err;
+ /* Insure that tci key attribute isn't
+ * overwritten by encapsulated customer tci.
+ */
+ v_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
+ *key_attrs |= v_attrs;
+ } else {
+ *key_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
+ err = parse_flow_nlattrs(nla, a, key_attrs,
+ log);
+ if (err)
+ return err;
+ }
+ } else if (!tci) {
+ /* Corner case for truncated 802.1Q header. */
+ if (nla_len(nla)) {
+ 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;
+ }
+
+ } else {
+ u64 mask_v_attrs = 0;
+
+ tci = 0;
+ 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;
+ return err;
+ }
+ err = parse_flow_mask_nlattrs(nla, a, &mask_v_attrs,
+ log);
+ if (err)
+ return err;
+
+ if (mask_v_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
+ err = cust_vlan_from_nlattrs(match, mask_v_attrs,
+ a, is_mask, log);
+ if (err)
+ return err;
+
+ mask_v_attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
+ *key_attrs |= mask_v_attrs;
+ } else {
+ *key_attrs &= ~(1 << OVS_KEY_ATTR_VLAN);
+ 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
@@ -1050,6 +1171,7 @@ int ovs_nla_get_match(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);
@@ -1058,35 +1180,24 @@ int ovs_nla_get_match(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)))) {
+ if (!((key_attrs & (1ULL << OVS_KEY_ATTR_VLAN)) &&
+ (key_attrs & (1ULL << OVS_KEY_ATTR_ENCAP)))) {
OVS_NLERR(log, "Invalid Vlan frame.");
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(match, key_attrs, a, false, log);
@@ -1132,7 +1243,6 @@ int ovs_nla_get_match(struct sw_flow_match *match,
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.");
@@ -1158,15 +1268,13 @@ int ovs_nla_get_match(struct sw_flow_match *match,
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;
+ err = parse_vlan_from_nlattrs(encap, match,
+ &mask_attrs,
+ &i_encap_valid, a, true,
+ log);
+ if (err)
goto free_newmask;
- }
+
}
err = ovs_key_from_nlattrs(match, mask_attrs, a, true, log);
@@ -1331,6 +1439,25 @@ static int __ovs_nla_put_key(const struct sw_flow_key *swkey,
encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
if (!swkey->eth.tci)
goto unencap;
+ } else if (swkey->eth.ctci || swkey->eth.type == htons(ETH_P_8021AD)) {
+ __be16 eth_type;
+
+ eth_type = !is_mask ? htons(ETH_P_8021AD) : htons(0xffff);
+ if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
+ nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
+ goto nla_put_failure;
+ encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
+ if (!swkey->eth.tci)
+ goto unencap;
+ /* Customer tci is nested but uses same key attribute.
+ */
+ 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.ctci))
+ goto nla_put_failure;
+ encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
+ if (!swkey->eth.ctci)
+ goto unencap;
} else
encap = NULL;
@@ -2078,7 +2205,8 @@ static int __ovs_nla_copy_actions(const struct nlattr *attr,
case OVS_ACTION_ATTR_PUSH_VLAN:
vlan = nla_data(a);
- if (vlan->vlan_tpid != htons(ETH_P_8021Q))
+ if ((vlan->vlan_tpid != htons(ETH_P_8021Q)) &&
+ (vlan->vlan_tpid != htons(ETH_P_8021AD)))
return -EINVAL;
if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT)))
return -EINVAL;
--
2.1.0
--
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