Hi all,
I am implementing SRv6 Encap/Decap actions and already have a working
source tree, although messy. It's a huge change, so I was wondering
if anyone could review the design before I send it off as patch series.
Examples of suggested actions are as follows:
actions=push_srv6(mode=encap,segs=(fc00:3::11,fc00:3::12)),output:p2
actions=pop_srv6,output:p2
Each corresponds to the following commands in iproute2 [1]:
ip -6 route add ... encap seg6 mode encap segs fc00:3::11,fc00:3::12 dev p2
ip -6 route add ... encap seg6local action End.DX4 dev p2
push_srv6 accepts IPv4 or IPv6 packets. When mode=encap, it prepends IPv6
header and SRH (Segment Routing Header) as Outer Header for encapsulation;
when mode=inline, it inserts SRH only. Equivalent to T.encap and T.inline,
respectively. pop_srv6 performs the reverse operation of push_srv6.
Changes for push_srv6 are as follows: pop_srv6 is similar.
Files Changes
-------------------------------------------------
-----------------------------------------------------
datapath/linux/compat/include/linux/openvswitch.h add
OVS_ACTION_ATTR_PUSH_SRV6 to enum ovs_action_attr
include/openvswitch/ofp-actions.h add PUSH_SRV6 to OFPACTS
include/openvswitch/ofp-actions.h add struct ofpact_push_srv6
lib/ofp-actions.c add
{decode_OFPAT_RAW11,encode,parse,format,check}_PUSH_SRV6
lib/packets.c add dp_packet_resize_l3
lib/packets.c add push_srv6
As an alternative idea, a port-based implementation like
“ovs-vsctl add-port ... set interface ... type=srv6 options:sids=...”
was considered. But this patch series doesn’t use port-based
implementation because it is desirable to have flexible control over
SIDs (Segment IDs) by flow rules.
As you may know, SRv6 is already implemented in some data planes, including
Linux, VPP, P4, and XDP [2]. Since many users already have important assets
using OVS ecosystem, I think it is significant to be able to keep them and
support SRv6.
I am new to OVS, so any comments would be greatly appreciated.
[1] https://man7.org/linux/man-pages/man8/ip-route.8.html
[2] https://www.segment-routing.net/open-software
Best Regards,
Nobuhiro Miki
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