1 files changed, 79 insertions, 0 deletions
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
new file mode 100644
index 00000000..6b038265
--- /dev/null
+++ b/net/ipv6/addrconf_core.c
@@ -0,0 +1,79 @@
+/*
+ * 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_UNICAST |
+		IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));	/* addr-select 3.4 */
+}
+EXPORT_SYMBOL(__ipv6_addr_type);
+