[ovs-dev] [PATCH v2 02/10] datapath-windows/Netlink: Add NlFillOvsMsg API for creating Netlink message headers.

[Ankur Sharma]

Added NlFillOvsMsg API in Netlink.c This API will be used to populate
netlink message headers.

Signed-off-by: Ankur Sharma <ankursharma at vmware.com>
Acked-by: Alin Gabriel Serdean <aserdean at cloudbasesolutions.com>
Acked-by: Eitan Eliahu <eliahue at vmware.com>
---
 datapath-windows/ovsext/Netlink/Netlink.c | 38 +++++++++++++++++++++++++++++++
 datapath-windows/ovsext/Netlink/Netlink.h |  6 +++++
 2 files changed, 44 insertions(+)

diff --git a/datapath-windows/ovsext/Netlink/Netlink.c b/datapath-windows/ovsext/Netlink/Netlink.c
index c286c2f..a2829a5 100644
--- a/datapath-windows/ovsext/Netlink/Netlink.c
+++ b/datapath-windows/ovsext/Netlink/Netlink.c
@@ -34,6 +34,44 @@
 
 /*
  * ---------------------------------------------------------------------------
+ * Prepare netlink message headers. Attributes should be added by caller.
+ * ---------------------------------------------------------------------------
+ */
+NTSTATUS
+NlFillOvsMsg(POVS_MESSAGE msgOut, PNL_BUFFER nlBuf,
+             UINT16 nlmsgType, UINT16 nlmsgFlags,
+             UINT32 nlmsgSeq, UINT32 nlmsgPid,
+             UINT8 genlCmd, UINT8 genlVer, UINT32 dpNo)
+{
+    BOOLEAN writeOk;
+    PNL_MSG_HDR nlMsg;
+
+    /* XXX: Add API for nlBuf->bufRemLen. */
+    ASSERT(NlBufAt(nlBuf, 0, 0) != 0 &&
+           nlBuf->bufRemLen >= sizeof (struct _OVS_MESSAGE));
+
+    msgOut->nlMsg.nlmsgType = nlmsgType;
+    msgOut->nlMsg.nlmsgFlags = nlmsgFlags;
+    msgOut->nlMsg.nlmsgSeq = nlmsgSeq;
+    msgOut->nlMsg.nlmsgPid = nlmsgPid;
+
+    msgOut->genlMsg.cmd = genlCmd;
+    msgOut->genlMsg.version = genlVer;
+    msgOut->genlMsg.reserved = 0;
+
+    msgOut->ovsHdr.dp_ifindex = dpNo;
+
+    writeOk = NlMsgPutHead(nlBuf, (PCHAR)msgOut,
+                           sizeof (struct _OVS_MESSAGE));
+
+    nlMsg = (PNL_MSG_HDR)NlBufAt(nlBuf, 0, 0);
+    nlMsg->nlmsgLen = NlBufSize(nlBuf);
+
+    return writeOk ? STATUS_SUCCESS : STATUS_INVALID_BUFFER_SIZE;
+}
+
+/*
+ * ---------------------------------------------------------------------------
  * Adds Netlink Header to the NL_BUF.
  * ---------------------------------------------------------------------------
  */
diff --git a/datapath-windows/ovsext/Netlink/Netlink.h b/datapath-windows/ovsext/Netlink/Netlink.h
index b036723..774faf4 100644
--- a/datapath-windows/ovsext/Netlink/Netlink.h
+++ b/datapath-windows/ovsext/Netlink/Netlink.h
@@ -78,6 +78,12 @@ typedef struct _NL_POLICY
 #define NL_ATTR_GET_AS(NLA, TYPE) \
         (*(TYPE*) NlAttrGetUnspec(nla, sizeof(TYPE)))
 
+NTSTATUS
+NlFillOvsMsg(POVS_MESSAGE msgOut, PNL_BUFFER nlBuf,
+             UINT16 nlmsgType, UINT16 nlmsgFlags,
+             UINT32 nlmsgSeq, UINT32 nlmsgPid,
+             UINT8 genlCmd, UINT8 genlVer, UINT32 dpNo);
+
 /* Netlink message accessing the payload */
 PVOID NlMsgAt(const PNL_MSG_HDR nlh, UINT32 offset);
 UINT32 NlMsgSize(const PNL_MSG_HDR nlh);
-- 
1.9.1