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Date: Thu, 12 Dec 2019 20:05:16 +0530
From: Martin Varghese <martinvarghesenokia@...il.com>
To: netdev@...r.kernel.org, davem@...emloft.net, pshelar@....org,
scott.drennan@...ia.com, jbenc@...hat.com,
martin.varghese@...ia.com
Subject: [PATCH net-next v2 3/3] openvswitch: New MPLS actions for layer 2 tunnelling
From: Martin Varghese <martin.varghese@...ia.com>
The existing PUSH MPLS action inserts MPLS header between ethernet header
and the IP header. Though this behaviour is fine for L3 VPN where an IP
packet is encapsulated inside a MPLS tunnel, it does not suffice the L2
VPN (l2 tunnelling) requirements. In L2 VPN the MPLS header should
encapsulate the ethernet packet.
The new mpls action PTAP_PUSH_MPLS inserts MPLS header at specified offset
from the start of packet.
A special handling is added for ethertype 0 in the existing POP MPLS action.
Value 0 in ethertype indicates the tunnelled packet is ethernet.
Signed-off-by: Martin Varghese <martin.varghese@...ia.com>
---
include/uapi/linux/openvswitch.h | 21 ++++++++++++++++++++-
net/openvswitch/actions.c | 26 ++++++++++++++++++++------
net/openvswitch/flow_netlink.c | 15 +++++++++++++++
3 files changed, 55 insertions(+), 7 deletions(-)
diff --git a/include/uapi/linux/openvswitch.h b/include/uapi/linux/openvswitch.h
index a87b44c..aaf7d3a 100644
--- a/include/uapi/linux/openvswitch.h
+++ b/include/uapi/linux/openvswitch.h
@@ -673,6 +673,23 @@ struct ovs_action_push_mpls {
};
/**
+ * struct ovs_action_ptap_push_mpls - %OVS_ACTION_ATTR_PTAP_PUSH_MPLS action
+ * argument.
+ * @mpls_lse: MPLS label stack entry to push.
+ * @mpls_ethertype: Ethertype to set in the encapsulating ethernet frame.
+ * @mac_len: Offset from start of packet at which MPLS header is pushed.
+ *
+ * The only values @mpls_ethertype should ever be given are %ETH_P_MPLS_UC and
+ * %ETH_P_MPLS_MC, indicating MPLS unicast or multicast. Other are rejected.
+ */
+struct ovs_action_ptap_push_mpls {
+ __be32 mpls_lse;
+ __be16 mpls_ethertype; /* Either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC */
+ __u16 mac_len;
+};
+
+
+/**
* struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
* @vlan_tpid: Tag protocol identifier (TPID) to push.
* @vlan_tci: Tag control identifier (TCI) to push. The CFI bit must be set
@@ -892,7 +909,8 @@ struct check_pkt_len_arg {
* @OVS_ACTION_ATTR_CHECK_PKT_LEN: Check the packet length and execute a set
* of actions if greater than the specified packet length, else execute
* another set of actions.
- *
+ * @OVS_ACTION_ATTR_PUSH_MPLS: Push a new MPLS label stack entry at specified
+ * offset from start of packet.
* Only a single header can be set with a single %OVS_ACTION_ATTR_SET. Not all
* fields within a header are modifiable, e.g. the IPv4 protocol and fragment
* type may not be changed.
@@ -927,6 +945,7 @@ enum ovs_action_attr {
OVS_ACTION_ATTR_METER, /* u32 meter ID. */
OVS_ACTION_ATTR_CLONE, /* Nested OVS_CLONE_ATTR_*. */
OVS_ACTION_ATTR_CHECK_PKT_LEN, /* Nested OVS_CHECK_PKT_LEN_ATTR_*. */
+ OVS_ACTION_ATTR_PTAP_PUSH_MPLS, /* struct ovs_action_push_mpls. */
__OVS_ACTION_ATTR_MAX, /* Nothing past this will be accepted
* from userspace. */
diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 4c83954..00e4517 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -161,16 +161,17 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
const struct nlattr *attr, int len);
static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
- const struct ovs_action_push_mpls *mpls)
+ __be32 mpls_lse, __be16 mpls_ethertype, __u16 mac_len)
{
int err;
- err = skb_mpls_push(skb, mpls->mpls_lse, mpls->mpls_ethertype,
- skb->mac_len,
- ovs_key_mac_proto(key) == MAC_PROTO_ETHERNET);
+ err = skb_mpls_push(skb, mpls_lse, mpls_ethertype, mac_len, !!mac_len);
if (err)
return err;
+ if (!mac_len)
+ key->mac_proto = MAC_PROTO_NONE;
+
invalidate_flow_key(key);
return 0;
}
@@ -185,6 +186,9 @@ static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
if (err)
return err;
+ if (!skb->mac_len && !ethertype)
+ key->mac_proto = MAC_PROTO_ETHERNET;
+
invalidate_flow_key(key);
return 0;
}
@@ -1229,10 +1233,20 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
execute_hash(skb, key, a);
break;
- case OVS_ACTION_ATTR_PUSH_MPLS:
- err = push_mpls(skb, key, nla_data(a));
+ case OVS_ACTION_ATTR_PUSH_MPLS: {
+ struct ovs_action_push_mpls *mpls = nla_data(a);
+
+ err = push_mpls(skb, key, mpls->mpls_lse,
+ mpls->mpls_ethertype, skb->mac_len);
break;
+ }
+ case OVS_ACTION_ATTR_PTAP_PUSH_MPLS: {
+ struct ovs_action_ptap_push_mpls *mpls = nla_data(a);
+ err = push_mpls(skb, key, mpls->mpls_lse,
+ mpls->mpls_ethertype, mpls->mac_len);
+ break;
+ }
case OVS_ACTION_ATTR_POP_MPLS:
err = pop_mpls(skb, key, nla_get_be16(a));
break;
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index 65c2e34..b7c80fd 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -79,6 +79,7 @@ static bool actions_may_change_flow(const struct nlattr *actions)
case OVS_ACTION_ATTR_SET_MASKED:
case OVS_ACTION_ATTR_METER:
case OVS_ACTION_ATTR_CHECK_PKT_LEN:
+ case OVS_ACTION_ATTR_PTAP_PUSH_MPLS:
default:
return true;
}
@@ -3005,6 +3006,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
[OVS_ACTION_ATTR_METER] = sizeof(u32),
[OVS_ACTION_ATTR_CLONE] = (u32)-1,
[OVS_ACTION_ATTR_CHECK_PKT_LEN] = (u32)-1,
+ [OVS_ACTION_ATTR_PTAP_PUSH_MPLS] = sizeof(struct ovs_action_ptap_push_mpls),
};
const struct ovs_action_push_vlan *vlan;
int type = nla_type(a);
@@ -3072,6 +3074,19 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
case OVS_ACTION_ATTR_RECIRC:
break;
+ case OVS_ACTION_ATTR_PTAP_PUSH_MPLS: {
+ const struct ovs_action_push_mpls *mpls = nla_data(a);
+
+ eth_type = mpls->mpls_ethertype;
+ if (mac_proto != MAC_PROTO_NONE) {
+ mpls_label_count = 1;
+ mac_proto = MAC_PROTO_NONE;
+ } else {
+ mpls_label_count++;
+ }
+ break;
+ }
+
case OVS_ACTION_ATTR_PUSH_MPLS: {
const struct ovs_action_push_mpls *mpls = nla_data(a);
--
1.8.3.1
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