datapath-windows: Add IPv6 conntrack support on Windows.

Implementation on Windows:
Currently, IPv4 conntrack was supported on the windows platform.
In this patch we have implemented ipv6 conntrack functions according
to the current logic of the IPv4 conntrack. This implementation has
included TcpV6(nat and normal scenario), UdpV6(nat and normal scenario),
IcmpV6 conntrack of echo request/reply packet and
FtpV6(nat and normal scenario).

Testing Topology:
On the Windows VM runs on the ESXi host, two hyper-v ports attached
to the ovs bridge; one hyper-v port worked as client and the
other port worked as server.

Testing Case:
1. TcpV6
  a) Tcp request/reply conntrack for normal scenario.
     In this scenario, 20::1 as client, 20::2 as server, it will generate
     following conntrack entry:
     (Origin(src=20::1, src_port=1555, dst=20::2, dst_port=1556),
      reply(src=20::2,src_port=1556,dst=20::1,dst_port=1555),protocol=tcp)

  b) Tcp request/reply conntrack for nat scenario.
     In this scenario, 20::1 as client, 20::10 as floating ip, 21::3 as server,
     it will generate following conntrack entry:
     (Origin(src=20::1, src_port=1555, dst=20::10, dst_port=1556),
      reply(src=21::3, src_port=1556, dst=20::1, dst_port= 1555),protocol=tcp)

2. UdpV6
  a) Udp request/reply conntrack for normal scenario.
     (Origin(src=20::1, src_port=1555, dst=20::2, dst_port=1556),
      reply(src=20::2,src_port=1556,dst=20::1,dst_port=1555),protocol=udp)
  b) Udp request/reply conntrack for nat scenario.
     (Origin(src=20::1, src_port=1555, dst=20::10, dst_port=1556),
      reply(src=21::3, src_port=1556, dst=20::1, dst_port= 1555),protocol=udp)

3. IcmpV6:
  a) Icmpv6 request/reply conntrack for normal scenario.
     Currently Icmpv6 only support to construct conntrack for
     echo request/reply packet, take (20::1 -> 20::2)  for example,
     it will generate following conntrack entry:
     (origin(src = 20::1, dst=20::2), reply(src=20::2, dst=20::1), protocol=icmp)
  b) Icmp request/reply conntrack for dnat scenario,
     for example (20::1->20::10->21::3), 20::1 is
     client, 20::10 is floating ip, 21::3 is server ip.
     It will generate flow like below:
     (origin(src=20::1, dst=20::10), reply(src=21::3, dst=20::1), protocol=icmp)

4. FtpV6
  a) Ftp request/reply conntrack for normal scenario.
     In this scenario, take 20::1 as client, 20::2 as server, it will generate
     two conntrack entries:
     Ftp active mode
     (Origin(src=20::1, src_port=1555, dst=20::2, dst_port=21),
      reply(src=20::2, src_port=21, dst=20::1, dst_port=1555), protocol=tcp)
     (Origin(src=20::2, src_port=20, dst=20::1, dst_port=1556),
      reply(src=20::1, src_port=1556, dst=20::2, dst_port=20), protocol=tcp)

     Ftp passive mode
     (Origin(src=20::1, src_port=1555, dst=20::2, dst_port=21),
      reply(src=20::2,src_port=21,dst=20::1,dst_port=1555),protocol=tcp)
     (Origin(src=20::1, src_port=1556, dst=20::2, dst_port=1557),
      reply(src=20::2,src_port=1557, dst=20::1, dst_port=1556) protocol=tcp)

  b) Ftp request/reply conntrack for nat scenario.
     Ftp passive mode,
     In this secnario, 20::1 as client, 20::10 as floating ip, 21::3 as server
     ip. It will generate following flow:
     (Origin(src=20::1, src_port=1555, dst=20::10, dst_port=21),
     reply(src=21::3, src_port=21, dst=20::1, dst_port= 1555),protocol=tcp)
     (Origin(src=20::1, src_port=1556, dst=20::10, dst_port=1557),
     reply(src=21::3, src_port=1557, dst=20::1, dst_port= 1556),protocol=tcp)

5. Regression test for IpV4 in Antrea project (about 60 test case)

Future work:
  1) IcmpV6 redirect packet conntrack.
  2) IpV6 fragment support on Udp.
  3) Support napt for IPv6.
  4) FtpV6 active mode for nat.

Signed-off-by: ldejing <ldejing@vmware.com>
Signed-off-by: Alin-Gabriel Serdean <aserdean@ovn.org>

1 files changed, 5 insertions, 29 deletions

diff --git a/datapath-windows/ovsext/Conntrack.h b/datapath-windows/ovsext/Conntrack.h
index bbbf49c11..b68a54f30 100644
--- a/datapath-windows/ovsext/Conntrack.h
+++ b/datapath-windows/ovsext/Conntrack.h
@@ -167,33 +167,8 @@ OvsConntrackUpdateExpiration(OVS_CT_ENTRY *ctEntry,
     ctEntry->expiration = now + interval;
 }
 
-static const TCPHdr*
-OvsGetTcpHeader(PNET_BUFFER_LIST nbl,
-                OVS_PACKET_HDR_INFO *layers,
-                VOID *storage,
-                UINT32 *tcpPayloadLen)
-{
-    IPHdr *ipHdr;
-    TCPHdr *tcp;
-    VOID *dest = storage;
-
-    ipHdr = NdisGetDataBuffer(NET_BUFFER_LIST_FIRST_NB(nbl),
-                              layers->l4Offset + sizeof(TCPHdr),
-                              NULL, 1 /*no align*/, 0);
-    if (ipHdr == NULL) {
-        return NULL;
-    }
-
-    ipHdr = (IPHdr *)((PCHAR)ipHdr + layers->l3Offset);
-    tcp = (TCPHdr *)((PCHAR)ipHdr + ipHdr->ihl * 4);
-    if (tcp->doff * 4 >= sizeof *tcp) {
-        NdisMoveMemory(dest, tcp, sizeof(TCPHdr));
-        *tcpPayloadLen = TCP_DATA_LENGTH(ipHdr, tcp);
-        return storage;
-    }
-
-    return NULL;
-}
+const TCPHdr* OvsGetTcpHeader(PNET_BUFFER_LIST nbl, OVS_PACKET_HDR_INFO *layers,
+                                     VOID *storage, UINT32 *tcpPayloadLen);
 
 VOID OvsCleanupConntrack(VOID);
 NTSTATUS OvsInitConntrack(POVS_SWITCH_CONTEXT context);
@@ -203,6 +178,7 @@ NDIS_STATUS OvsExecuteConntrackAction(OvsForwardingContext *fwdCtx,
                                       const PNL_ATTR a);
 BOOLEAN OvsConntrackValidateTcpPacket(const TCPHdr *tcp);
 BOOLEAN OvsConntrackValidateIcmpPacket(const ICMPHdr *icmp);
+BOOLEAN OvsConntrackValidateIcmp6Packet(const ICMPHdr *icmp);
 OVS_CT_ENTRY * OvsConntrackCreateTcpEntry(const TCPHdr *tcp,
                                           UINT64 now,
                                           UINT32 tcpPayloadLen);
@@ -235,8 +211,8 @@ NTSTATUS OvsInitCtRelated(POVS_SWITCH_CONTEXT context);
 VOID OvsCleanupCtRelated(VOID);
 NDIS_STATUS OvsCtRelatedEntryCreate(UINT8 ipProto,
                                     UINT16 dl_type,
-                                    UINT32 serverIp,
-                                    UINT32 clientIp,
+                                    struct ct_addr serverIp,
+                                    struct ct_addr clientIp,
                                     UINT16 serverPort,
                                     UINT16 clientPort,
                                     UINT64 currentTime,