tunneling: Add datapath GRE support.

[sliver-openvswitch.git] / datapath / linux-2.6 / compat-2.6 / addrconf_core-openvswitch.c

diff --git a/datapath/linux-2.6/compat-2.6/addrconf_core-openvswitch.c b/datapath/linux-2.6/compat-2.6/addrconf_core-openvswitch.c
new file mode 100644 (file)
index 0000000..b5a7574
--- /dev/null
+++ b/datapath/linux-2.6/compat-2.6/addrconf_core-openvswitch.c
@@ -0,0 +1,82 @@
+#include <linux/version.h>
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,21)
+
+/*
+ * IPv6 library code, needed by static components when full IPv6 support is
+ * not configured or static.
+ */
+
+#include <net/ipv6.h>
+
+#define IPV6_ADDR_SCOPE_TYPE(scope)    ((scope) << 16)
+
+static inline unsigned ipv6_addr_scope2type(unsigned scope)
+{
+       switch(scope) {
+       case IPV6_ADDR_SCOPE_NODELOCAL:
+               return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
+                       IPV6_ADDR_LOOPBACK);
+       case IPV6_ADDR_SCOPE_LINKLOCAL:
+               return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
+                       IPV6_ADDR_LINKLOCAL);
+       case IPV6_ADDR_SCOPE_SITELOCAL:
+               return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
+                       IPV6_ADDR_SITELOCAL);
+       }
+       return IPV6_ADDR_SCOPE_TYPE(scope);
+}
+
+int __ipv6_addr_type(const struct in6_addr *addr)
+{
+       __be32 st;
+
+       st = addr->s6_addr32[0];
+
+       /* Consider all addresses with the first three bits different of
+          000 and 111 as unicasts.
+        */
+       if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
+           (st & htonl(0xE0000000)) != htonl(0xE0000000))
+               return (IPV6_ADDR_UNICAST |
+                       IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
+
+       if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
+               /* multicast */
+               /* addr-select 3.1 */
+               return (IPV6_ADDR_MULTICAST |
+                       ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
+       }
+
+       if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
+               return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
+                       IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));               /* addr-select 3.1 */
+       if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
+               return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
+                       IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));               /* addr-select 3.1 */
+       if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
+               return (IPV6_ADDR_UNICAST |
+                       IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));                  /* RFC 4193 */
+
+       if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
+               if (addr->s6_addr32[2] == 0) {
+                       if (addr->s6_addr32[3] == 0)
+                               return IPV6_ADDR_ANY;
+
+                       if (addr->s6_addr32[3] == htonl(0x00000001))
+                               return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
+                                       IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.4 */
+
+                       return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
+                               IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
+               }
+
+               if (addr->s6_addr32[2] == htonl(0x0000ffff))
+                       return (IPV6_ADDR_MAPPED |
+                               IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */
+       }
+
+       return (IPV6_ADDR_RESERVED |
+               IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */
+}
+
+#endif /* kernel < 2.6.21 */