Use API other than route command to add route entry for ipv4;

Refine the code;
List issues in the README.cygwin;

component/babeld/Makefile

@@ -64,7 +64,7 @@ clean:
 
 kernel.o: kernel_netlink.c kernel_socket.c kernel_cygwin.c
 
-# Usage: ./testc.exe
+# Usage: ./test.exe
 # Verify most of the functions in the cyginet.c
-testc.exe: cyginet.c
+test.exe: cyginet.c
 	$(CC) $(CFLAGS) $(LDFLAGS) -DTEST_CYGINET -o $@ $< $(LDLIBS)

component/babeld/README.cygwin

@@ -46,7 +46,97 @@ Control Panel -> Network Connections.
 
 You should see all the connections like "Local Area Connection
 3". Right click and rename this to something shorter and without
-embedded spaces such as "my-tap".
+embedded spaces such as "tap1".
+
+Or
+
+$ netsh interface set interface name = "Local Area Connection 3" newname="tap1"
+
+Test babeld in the Cygwin
+=========================
+
+We need 2 laptops, a wireless router, one laptop connects the router
+by wireless netcard, another is wired.
+
+Both of laptops install Openvpn for cygwin, enable ipv6 forwarding on
+each tap interface
+
+Laptop A:
+
+  lan            Disconnect
+
+  wlan           192.168.121.100/24
+                 2001::A1 (manual)
+
+  tap            ifindex = 11, ipv6 forwarding=enabled
+                 10.100.0.1/24          
+                 fe80::2ff:38ff:fed8:7d97  (auto link addr)
+                 
+Laptop B:
+
+  lan            192.168.121.21/24
+                 2001::B1 (manual)
+
+  tap            ifindex = 7, ipv6 forwarding=enabled
+                 10.200.0.1/24           
+                 fe80::2ff:17ff:fee4:8ed0 (auto link addr)
+
+Router R:
+       192.168.121.1/24
+
+
+In the laptop A, run the following command:
+
+# Start openvpn server
+$ cd C:/Program Files/OpenVPN/server 
+$ ../bin/openvpn.exe --config server.ovpn
+
+# Startup babeld
+$ babeld.exe -d 3 -h 15 -H 15 -s wlan tap
+
+# Assign ipv6 unicast address to interfaces
+# netsh interface ipv6 add address wlan 2001:A1
+# netsh interface ipv6 set interface tap forwarding=enabled
+
+In the laptop B, run the following command:
+
+# Start openvpn client
+$ cd C:/Program Files/OpenVPN/client 
+$ ../bin/openvpn.exe --config client.ovpn
+
+# Startup babeld
+$ babeld.exe -d 3 -h 15 -H 15 -s lan tap1
+
+# Assign ipv6 unicast address to interfaces
+# netsh interface ipv6 add address lan 2001:B1
+# netsh interface ipv6 set interface tap forwarding=enabled
+
+Then ping6 to each other , 
+
+In laptop A, 
+$ ping6 2001::B1
+
+In laptop B,
+$ ping6 2001::A1
+
+It should work.
+
+Check kernel route:
+$ netsh interface ipv6 show route
+
+Example output of A
+
+Publish  Type       Met  Prefix                    Idx  Gateway/Interface Name
+-------  --------  ----  ------------------------  ---  ---------------------
+no       Manual       0  ::/0                       11  fe80::2ff:17ff:fee4:8ed0
+
+
+Example output of B
+
+Publish  Type       Met  Prefix                    Idx  Gateway/Interface Name
+-------  --------  ----  ------------------------  ---  ---------------------
+no       Manual       0  ::/0                       7   fe80::2ff:38ff:fed8:7d97
+
 
 Notes
 =====
@@ -66,22 +156,31 @@ Notes
 5. Ipv6 option "IPV6_V6ONLY" only works in the Windows Vista later.
 
 6. If one connection is assigned more than one ipv4 address, babeld
-   returns the first one only, is it right? I'm not sure.
+   returns the first one only to check whether ipv4 address changed,
+   is it right? I'm not sure.
 
 7. Regarding IPV6CTL_FORWARDING and IPV6CTL_SENDREDIRECTS, MSDN says
-   that you can set both of options for Ipv4 in the registry:
-   "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters",
-   but says nothing for Ipv6. Does it work for ipv6 in the registry:
-   "HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters"
-   ?
+   that you can set both of options in the registry:
+   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters
+   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters
+
+   IPEnableRouter, DWORD
+   EnableICMPRedirect, DWORD
+
+   Refers to:
+          http://support.microsoft.com/kb/315236/en-us
+          http://technet.microsoft.com/en-us/library/cc766102(v=ws.10).aspx
+          http://msdn.microsoft.com/en-us/library/aa915651.aspx
+
+   For Ipv6, FORWARDING is set per interface, not global setting.
 
 8. There is no RTM_BLACKHOLE, RTM_REJECT, NULLROUTE in the windows, in
    the kernel_cygwin.c!kernel_route, we only use local address as
    gateway in the BLACKHOLE route entry. Is it OK?
 
-   A: It's not OK actually. In the Windows, you can't use 127.0.0.1 as
-      gateway when add route entry. So the solution is find one
-      interface other than loopback interface, then use its
+   A: It's not OK actually for ipv4. In the Windows, you can't use
+      127.0.0.1 as gateway when add route entry. So the solution is
+      find one interface other than loopback interface, then use its
       uni-address as gateway, it will be a blackhole route entry. For
       example, if you have an interface which ip addr is
       192.168.128.100, and ifindex is 5, then
@@ -92,3 +191,8 @@ Notes
 
 9. IN6_LINKLOCAL_IFINDEX && SET_IN6_LINKLOCAL_IFINDEX, do both of them
    work in the Windows?
+
+   A: We can ignore both of them. In the windows, it use the following
+      format to specify interface index in the link local address:
+
+      fe80::2ff:38ff:fed8:7d97%11

component/babeld/cyginet.h

@@ -49,12 +49,47 @@
   Routing Table Manager Version 2
   http://msdn.microsoft.com/en-us/library/windows/desktop/bb404201(v=vs.85).aspx
 
-  Using Routing Table Manager Version 2
+  Using Routing Table Manager Version 2, this section contains sample
+  code that can be used when developing clients such as routing
+  protocols.
   http://msdn.microsoft.com/en-us/library/windows/desktop/aa382335(v=vs.85).aspx
 
-  This section contains sample code that can be used when developing
-  clients such as routing protocols.
+  An introduction to the IPv6 protocol along with overviews on
+  deployment and IPv6 transitioning technologies is available on
+  Technet at Microsoft Internet Protocol Version 6 (IPv6).
+  http://go.microsoft.com/fwlink/p/?linkid=194338
+  http://technet.microsoft.com/en-us/network/bb530961.aspx
 
+  Internet Protocol Version 6 (IPv6)
+  http://msdn.microsoft.com/en-us//library/windows/desktop/ms738570(v=vs.85).aspx
+
+  IPv6 Link-local and Site-local Addresses
+  http://msdn.microsoft.com/zh-cn/library/windows/desktop/ms739166(v=vs.85).aspx
+
+  Recommended Configurations for IPv6
+  http://msdn.microsoft.com/en-us/library/windows/desktop/ms740117(v=vs.85).aspx
+
+  IPv6 Support in Home Routers, It looks like a windows re6stnet.
+  http://msdn.microsoft.com/en-us/windows/hardware/gg463251.aspx
+
+  Neighbor Discovery in IPv6
+  http://tools.ietf.org/html/rfc4861
+
+  Default Address Selection for Internet Protocol version 6 (IPv6)
+  http://tools.ietf.org/html/rfc3484
+
+  Path MTU Discovery
+  http://tools.ietf.org/html/rfc1191
+
+  IPv6 Traffic Between Nodes on Different Subnets of an IPv4 Internetwork (6to4)
+  http://msdn.microsoft.com/zh-cn/library/windows/desktop/ms737598(v=vs.85).aspx
+
+  Multicast Listener Discovery (MLD)
+  http://msdn.microsoft.com/en-us/library/aa916334.aspx
+
+  IPv6 Addresses, it explains the relation between link-local address
+  and interface id
+  http://msdn.microsoft.com/en-us/library/aa921042.aspx
  */
 
 #ifndef __CYGIFNET_H__
@@ -118,6 +153,9 @@ typedef struct _LIBWINET_INTERFACE_MAP_TABLE {
   BYTE      PhysicalAddress[MAX_ADAPTER_ADDRESS_LENGTH];
   DWORD     PhysicalAddressLength;
   DWORD     IfType;
+  int       RouteFlags;
+  DWORD     IfIndex;
+  DWORD     Ipv6IfIndex;
   VOID      *next;
 } LIBWINET_INTERFACE_MAP_TABLE, *PLIBWINET_INTERFACE_MAP_TABLE;
 
@@ -163,8 +201,8 @@ void cyginet_cleanup();
 
 int cyginet_start_monitor_route_changes(int);
 int cyginet_stop_monitor_route_changes();
-int cyginet_set_ipv6_forwards(int);
 int cyginet_set_icmp6_redirect_accept(int);
+int cyginet_set_interface_forwards(const char * ifname, int value);
 
 int cyginet_interface_sdl(struct sockaddr_dl *, char *);
 int cyginet_interface_wireless(const char *, int);
@@ -182,10 +220,9 @@ int cyginet_delete_route_entry(const struct sockaddr *, unsigned short,
 int cyginet_update_route_entry(const struct sockaddr *, unsigned short,
                                const struct sockaddr *, int , unsigned int);
 
+int cyginet_add_ipentry(int, struct sockaddr*);
+
 char * cyginet_ifname(const char *);
 char * cyginet_guidname(const char *);
-char * cyginet_ipv4_index2ifname(int);
-
-int cyginet_blackhole_index(struct in6_addr*, char *);
-
+int cyginet_refresh_interface_table();
 #endif  /* __CYGIFNET_H__ */

component/babeld/net.c

@@ -49,6 +49,11 @@ babel_socket(int port)
     if(s < 0)
         return -1;
 
+    /* When this value is nonzero (the default on Windows), a socket
+       created for the AF_INET6 address family can be used to send and
+       receive IPv6 packets only.  So it's not require to set in the
+       Windows XP. Actualy, this socket option is only supported on
+       Windows Vista or later. */
 #if !defined(_WIN32_WINNT) || _WIN32_WINNT >= 0x0600
     rc = setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(one));
     if(rc < 0)