datapath-windows: Conntrack - Enable FTP support

Enable the support for tracking FTP connections in the Connection tracker.
This checks an incoming ftp control connection to extract the related data
connection. When a matching data connection arrives, it would then update
the connection entry to point to the original control connection.

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

2 files changed, 17 insertions, 0 deletions

diff --git a/datapath-windows/ovsext/Netlink/Netlink.c b/datapath-windows/ovsext/Netlink/Netlink.c
index 24322053c..a63f06623 100644
--- a/datapath-windows/ovsext/Netlink/Netlink.c
+++ b/datapath-windows/ovsext/Netlink/Netlink.c
@@ -992,6 +992,22 @@ NlAttrGetU64(const PNL_ATTR nla)
 
 /*
  * ---------------------------------------------------------------------------
+ * Returns the string value in 'nla''s payload.
+ * Returns NULL if it is not a proper '\0' terminated string.
+ * ---------------------------------------------------------------------------
+ */
+PCHAR
+NlAttrGetString(const PNL_ATTR nla)
+{
+    ASSERT(nla->nlaLen >= NLA_HDRLEN);
+    if (!memchr(NlAttrGet(nla), '\0', nla->nlaLen - NLA_HDRLEN)) {
+        return NULL;
+    }
+    return NlAttrGet(nla);
+}
+
+/*
+ * ---------------------------------------------------------------------------
  * Validate the netlink attribute against the policy
  * ---------------------------------------------------------------------------
  */
diff --git a/datapath-windows/ovsext/Netlink/Netlink.h b/datapath-windows/ovsext/Netlink/Netlink.h
index 363f57501..964c0e5f5 100644
--- a/datapath-windows/ovsext/Netlink/Netlink.h
+++ b/datapath-windows/ovsext/Netlink/Netlink.h
@@ -138,6 +138,7 @@ UINT8 NlAttrGetU8(const PNL_ATTR nla);
 UINT16 NlAttrGetU16(const PNL_ATTR nla);
 UINT32 NlAttrGetU32(const PNL_ATTR nla);
 UINT64 NlAttrGetU64(const PNL_ATTR nla);
+PCHAR NlAttrGetString(const PNL_ATTR nla);
 const PNL_ATTR NlAttrFind__(const PNL_ATTR attrs,
                             UINT32 size, UINT16 type);
 const PNL_ATTR NlAttrFindNested(const PNL_ATTR nla,