ovn-controller: Add 'put_dhcp_opts' action in ovn-controller

This patch adds a new OVN action 'put_dhcp_opts' to support native
DHCP in OVN.

ovn-controller parses this action and adds a NXT_PACKET_IN2
OF flow with 'pause' flag set and the DHCP options stored in
'userdata' field.

When the valid DHCP packet is received by ovn-controller, it frames a
new DHCP reply packet with the DHCP options present in the
'userdata' field and resumes the packet and stores 1 in the 1-bit subfield.
If the packet is invalid, it resumes the packet without any modifying and
stores 0 in the 1-bit subfield.

Eg. reg0[0] = put_dhcp_opts(offerip = 10.0.0.4, router = 10.0.0.1,
                  netmask = 255.255.255.0, lease_time = 3600,....)

A new 'DHCP_Options' table is added in SB DB which stores
the supported DHCP options with DHCP code and type. ovn-northd is
expected to popule this table.

The next patch will add logical flows with this action.

Signed-off-by: Numan Siddique <nusiddiq@redhat.com>
Co-authored-by: Ben Pfaff <blp@ovn.org>
Signed-off-by: Ben Pfaff <blp@ovn.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/include/openvswitch/meta-flow.h b/include/openvswitch/meta-flow.h
index e5f996208..84a0946d1 100644
--- a/include/openvswitch/meta-flow.h
+++ b/include/openvswitch/meta-flow.h
@@ -1930,6 +1930,18 @@ union mf_subvalue {
 
     /* Convenient access to just least-significant bits in various forms. */
     struct {
+        uint8_t dummy_u8[127];
+        uint8_t u8_val;
+    };
+    struct {
+        ovs_be16 dummy_be16[63];
+        ovs_be16 be16_int;
+    };
+    struct {
+        ovs_be32 dummy_be32[31];
+        ovs_be32 be32_int;
+    };
+    struct {
         ovs_be64 dummy_integer[15];
         ovs_be64 integer;
     };