1 files changed, 50 insertions, 0 deletions
diff --git a/netwerk/base/IPv6Utils.h b/netwerk/base/IPv6Utils.h
new file mode 100644
index 0000000000..437c0befec
--- /dev/null
+++ b/netwerk/base/IPv6Utils.h
@@ -0,0 +1,50 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef NETWORK_IPV6_UTILS_H_
+#define NETWORK_IPV6_UTILS_H_
+
+namespace mozilla {
+namespace net {
+namespace utils {
+
+// IPv6 address scopes.
+#define IPV6_SCOPE_GLOBAL 0       // Global scope.
+#define IPV6_SCOPE_LINKLOCAL 1    // Link-local scope.
+#define IPV6_SCOPE_SITELOCAL 2    // Site-local scope (deprecated).
+#define IPV6_SCOPE_UNIQUELOCAL 3  // Unique local
+#define IPV6_SCOPE_NODELOCAL 4    // Loopback
+
+// Return the scope of the given address.
+static int ipv6_scope(const unsigned char addr[16]) {
+  const unsigned char* b = addr;
+  unsigned short w = (unsigned short)((b[0] << 8) | b[1]);
+
+  if ((b[0] & 0xFE) == 0xFC) {
+    return IPV6_SCOPE_UNIQUELOCAL;
+  }
+  switch (w & 0xFFC0) {
+    case 0xFE80:
+      return IPV6_SCOPE_LINKLOCAL;
+    case 0xFEC0:
+      return IPV6_SCOPE_SITELOCAL;
+    case 0x0000:
+      w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] | b[10] |
+          b[11] | b[12] | b[13] | b[14];
+      if (w || b[15] != 0x01) {
+        break;
+      }
+      return IPV6_SCOPE_NODELOCAL;
+    default:
+      break;
+  }
+
+  return IPV6_SCOPE_GLOBAL;
+}
+
+}  // namespace utils
+}  // namespace net
+}  // namespace mozilla
+
+#endif  // NETWORK_IPV6_UTILS_H_