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openvswitch: New MPLS actions for layer 2 tunnelling

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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 ADD_MPLS inserts MPLS header at the start of the
packet or at the start of the l3 header depending on the value of l3 tunnel
flag in the ADD_MPLS arguments.

POP_MPLS action is extended to support ethertype 0x6558.

Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin Varghese 2019-12-21 08:50:46 +05:30 committed by David S. Miller
parent 76f99f987f
commit f66b53fdbb
3 changed files with 90 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
include/uapi/linux/openvswitch.h
View File

@ -672,6 +672,32 @@ struct ovs_action_push_mpls {
__be16 mpls_ethertype; /* Either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC */
};
/**
* struct ovs_action_add_mpls - %OVS_ACTION_ATTR_ADD_MPLS action
* argument.
* @mpls_lse: MPLS label stack entry to push.
* @mpls_ethertype: Ethertype to set in the encapsulating ethernet frame.
* @tun_flags: MPLS tunnel attributes.
*
* 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_add_mpls {
__be32 mpls_lse;
__be16 mpls_ethertype; /* Either %ETH_P_MPLS_UC or %ETH_P_MPLS_MC */
__u16 tun_flags;
};
#define OVS_MPLS_L3_TUNNEL_FLAG_MASK (1 << 0) /* Flag to specify the place of
* insertion of MPLS header.
* When false, the MPLS header
* will be inserted at the start
* of the packet.
* When true, the MPLS header
* will be inserted at the start
* of the l3 header.
*/
/**
* struct ovs_action_push_vlan - %OVS_ACTION_ATTR_PUSH_VLAN action argument.
* @vlan_tpid: Tag protocol identifier (TPID) to push.
@ -892,6 +918,10 @@ 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_ADD_MPLS: Push a new MPLS label stack entry at the
* start of the packet or at the start of the l3 header depending on the value
* of l3 tunnel flag in the tun_flags field of OVS_ACTION_ATTR_ADD_MPLS
* argument.
*
* 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
@ -927,6 +957,7 @@ 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_ADD_MPLS, /* struct ovs_action_add_mpls. */
__OVS_ACTION_ATTR_MAX, /* Nothing past this will be accepted
* from userspace. */

32
net/openvswitch/actions.c
View File

@ -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 (ethertype == htons(ETH_P_TEB))
key->mac_proto = MAC_PROTO_ETHERNET;
invalidate_flow_key(key);
return 0;
}
@ -1229,10 +1233,24 @@ 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));
break;
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_ADD_MPLS: {
struct ovs_action_add_mpls *mpls = nla_data(a);
__u16 mac_len = 0;
if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK)
mac_len = skb->mac_len;
err = push_mpls(skb, key, mpls->mpls_lse,
mpls->mpls_ethertype, mac_len);
break;
}
case OVS_ACTION_ATTR_POP_MPLS:
err = pop_mpls(skb, key, nla_get_be16(a));
break;

34
net/openvswitch/flow_netlink.c
View File

@ -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_ADD_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_ADD_MPLS] = sizeof(struct ovs_action_add_mpls),
};
const struct ovs_action_push_vlan *vlan;
int type = nla_type(a);
@ -3072,6 +3074,33 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
case OVS_ACTION_ATTR_RECIRC:
break;
case OVS_ACTION_ATTR_ADD_MPLS: {
const struct ovs_action_add_mpls *mpls = nla_data(a);
if (!eth_p_mpls(mpls->mpls_ethertype))
return -EINVAL;
if (mpls->tun_flags & OVS_MPLS_L3_TUNNEL_FLAG_MASK) {
if (vlan_tci & htons(VLAN_CFI_MASK) ||
(eth_type != htons(ETH_P_IP) &&
eth_type != htons(ETH_P_IPV6) &&
eth_type != htons(ETH_P_ARP) &&
eth_type != htons(ETH_P_RARP) &&
!eth_p_mpls(eth_type)))
return -EINVAL;
mpls_label_count++;
} else {
if (mac_proto == MAC_PROTO_ETHERNET) {
mpls_label_count = 1;
mac_proto = MAC_PROTO_NONE;
} else {
mpls_label_count++;
}
}
eth_type = mpls->mpls_ethertype;
break;
}
case OVS_ACTION_ATTR_PUSH_MPLS: {
const struct ovs_action_push_mpls *mpls = nla_data(a);
@ -3109,6 +3138,11 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
* recirculation.
*/
proto = nla_get_be16(a);
if (proto == htons(ETH_P_TEB) &&
mac_proto != MAC_PROTO_NONE)
return -EINVAL;
mpls_label_count--;
if (!eth_p_mpls(proto) || !mpls_label_count)