datapath-windows: Define new multicast conntrack events and netlink protocol

The Hyper-V datapath supports NETLINK_GENERIC and NETLINK_NETFILTER
protocols for netlink communication. Define these two protocols in the
datapath.

Define new Conntrack events (new and delete) and add support for
subscribing to these events. Parse out OVS_NL_ATTR_MCAST_GRP and store it
as part of OVS_EVENT_SUBSCRIBE structure.

Signed-off-by: Sairam Venugopal <vsairam@vmware.com>
Acked-By: Yin Lin <linyi@vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean@cloudbasesolutions.com>
Signed-off-by: Gurucharan Shetty <guru@ovn.org>

4 files changed, 39 insertions, 4 deletions

diff --git a/datapath-windows/ovsext/Datapath.c b/datapath-windows/ovsext/Datapath.c
index 75f133a90..f9f965c26 100644
--- a/datapath-windows/ovsext/Datapath.c
+++ b/datapath-windows/ovsext/Datapath.c
@@ -1273,11 +1273,12 @@ OvsSubscribeEventCmdHandler(POVS_USER_PARAMS_CONTEXT usrParamsCtx,
     OVS_EVENT_SUBSCRIBE request;
     BOOLEAN rc;
     UINT8 join;
+    UINT32 mcastGrp;
     PNL_ATTR attrs[2];
     const NL_POLICY policy[] =  {
         [OVS_NL_ATTR_MCAST_GRP] = {.type = NL_A_U32 },
         [OVS_NL_ATTR_MCAST_JOIN] = {.type = NL_A_U8 },
-        };
+    };
 
     UNREFERENCED_PARAMETER(replyLen);
 
@@ -1293,11 +1294,25 @@ OvsSubscribeEventCmdHandler(POVS_USER_PARAMS_CONTEXT usrParamsCtx,
         goto done;
     }
 
-    /* XXX Ignore the MC group for now */
+    mcastGrp = NlAttrGetU32(attrs[OVS_NL_ATTR_MCAST_GRP]);
     join = NlAttrGetU8(attrs[OVS_NL_ATTR_MCAST_JOIN]);
     request.dpNo = msgIn->ovsHdr.dp_ifindex;
     request.subscribe = join;
-    request.mask = OVS_EVENT_MASK_ALL;
+    request.mcastGrp = mcastGrp;
+    request.protocol = instance->protocol;
+    request.mask = 0;
+
+    /* We currently support Vport and CT related events */
+    if (instance->protocol == NETLINK_GENERIC) {
+        request.mask = OVS_EVENT_MASK_ALL;
+    } else if (instance->protocol == NETLINK_NETFILTER) {
+        if (mcastGrp == NFNLGRP_CONNTRACK_NEW) {
+            request.mask = OVS_EVENT_CT_NEW;
+        }
+        if (mcastGrp == NFNLGRP_CONNTRACK_DESTROY) {
+            request.mask = OVS_EVENT_CT_DELETE;
+        }
+    }
 
     status = OvsSubscribeEventIoctl(instance->fileObject, &request,
                                     sizeof request);
diff --git a/datapath-windows/ovsext/Datapath.h b/datapath-windows/ovsext/Datapath.h
index 2b41d82ac..57b483a30 100644
--- a/datapath-windows/ovsext/Datapath.h
+++ b/datapath-windows/ovsext/Datapath.h
@@ -51,7 +51,8 @@ typedef struct _OVS_OPEN_INSTANCE {
     PVOID eventQueue;
     POVS_USER_PACKET_QUEUE packetQueue;
     UINT32 pid;
-    UINT32 protocol; /* Refers to NETLINK Family (eg. NETLINK_GENERIC)*/
+    UINT32 protocol;    /* Refers to NETLINK Family (eg. NETLINK_GENERIC)*/
+    UINT32 mcastMask;   /* Mask of subscribed Mcast Groups */
 
     struct {
         POVS_MESSAGE ovsMsg;    /* OVS message passed during dump start. */
diff --git a/datapath-windows/ovsext/DpInternal.h b/datapath-windows/ovsext/DpInternal.h
index 8abe61dc3..22599a0e2 100644
--- a/datapath-windows/ovsext/DpInternal.h
+++ b/datapath-windows/ovsext/DpInternal.h
@@ -310,6 +310,8 @@ typedef struct _OVS_EVENT_SUBSCRIBE {
     uint32_t dpNo;
     uint32_t subscribe;
     uint32_t mask;
+    uint32_t mcastGrp;
+    uint32_t protocol;
 } OVS_EVENT_SUBSCRIBE, *POVS_EVENT_SUBSCRIBE;
 
 typedef struct _OVS_EVENT_POLL {
@@ -327,6 +329,20 @@ enum {
     OVS_EVENT_MASK_ALL      = 0x3f,
 };
 
+enum {
+    OVS_EVENT_CT_NEW        = (1 << 0),
+    OVS_EVENT_CT_DELETE     = (1 << 1),
+    OVS_EVENT_CT_MASK_ALL   = 0x3
+};
+
+/* Supported mcast event groups */
+enum OVS_MCAST_EVENT_TYPES {
+    OVS_MCAST_VPORT_EVENT,
+    OVS_MCAST_CT_EVENT,
+    __OVS_MCAST_EVENT_TYPES_MAX
+};
+#define OVS_MCAST_EVENT_TYPES_MAX (__OVS_MCAST_EVENT_TYPES_MAX \
+                                   - OVS_MCAST_VPORT_EVENT)
 
 typedef struct _OVS_VPORT_EVENT_ENTRY {
     UINT32 portNo;
diff --git a/datapath-windows/ovsext/Netlink/NetlinkProto.h b/datapath-windows/ovsext/Netlink/NetlinkProto.h
index beb14d552..517531199 100644
--- a/datapath-windows/ovsext/Netlink/NetlinkProto.h
+++ b/datapath-windows/ovsext/Netlink/NetlinkProto.h
@@ -125,4 +125,7 @@ BUILD_ASSERT_DECL(sizeof(NL_ATTR) == 4);
 #define OVS_HDRLEN NLMSG_ALIGN(sizeof(OVS_HDR))
 #define NLA_HDRLEN ((INT) NLA_ALIGN(sizeof(NL_ATTR)))
 
+#define NETLINK_NETFILTER       12
+#define NETLINK_GENERIC         16
+
 #endif /* NetlinProto.h */