The existing PUSH MPLS & POP MPLS actions inserts & removes 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 requirements. In L2 VPN the ethernet packets must be
encapsulated inside MPLS tunnel.
In this change the encap & decap actions are extended to support MPLS packet
type. The encap & decap adds and removes MPLS header at the start of packet
as depicted below.
Encapsulation:
Actions - encap(mpls(ether_type=0x8847)),encap(ethernet)
Incoming packet -> | ETH | IP | Payload |
1 Actions - encap(mpls(ether_type=0x8847)) [Kernel action -
ptap_push_mpls:0x8847]
Outgoing packet -> | MPLS | ETH | Payload|
2 Actions - encap(ethernet) [ Kernel action - push_eth ]
Outgoing packet -> | ETH | MPLS | ETH | Payload|
Decapsulation:
Incoming packet -> | ETH | MPLS | ETH | IP | Payload |
Actions - decap(),decap(packet_type(ns=0,type=0)
1 Actions - decap() [Kernel action - pop_eth)
Outgoing packet -> | MPLS | ETH | IP | Payload|
2 Actions - decap(packet_type(ns=0,type=0) [Kernel action - ptap_pop_mpls:0]
Outgoing packet -> | ETH | IP | Payload|
Note to reviewers -
This is an early drop to gather feedback and hence incomplete.
Martin Varghese (1):
Encap & Decap actions for MPLS Packet Type.
datapath/actions.c | 57 ++++++++++++++
datapath/flow_netlink.c | 13 ++++
datapath/linux/compat/include/linux/openvswitch.h | 2 +
include/openvswitch/ofp-ed-props.h | 18 +++++
lib/dpif.c | 2 +
lib/odp-execute.c | 2 +
lib/odp-util.c | 46 +++++++++--
lib/ofp-actions.c | 5 ++
lib/ofp-ed-props.c | 93 ++++++++++++++++++++++-
ofproto/ofproto-dpif-xlate.c | 58 +++++++++++++-
10 files changed, 288 insertions(+), 8 deletions(-)
--
1.8.3.1
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