1 files changed, 111 insertions, 0 deletions
diff --git a/nuttx/net/utils/net_ipv6_maskcmp.c b/nuttx/net/utils/net_ipv6_maskcmp.c
new file mode 100644
index 000000000..897f56dcf
--- /dev/null
+++ b/nuttx/net/utils/net_ipv6_maskcmp.c
@@ -0,0 +1,111 @@
+/****************************************************************************
+ * net/utils/net_ipv6_maskcmp.c
+ *
+ *   Copyright (C) 2015 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <nuttx/clock.h>
+#include <nuttx/net/ip.h>
+
+#include "utils/utils.h"
+
+#ifdef CONFIG_NET_IPv6
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Function: net_timeval2dsec
+ *
+ * Description:
+ *   Compare two IP addresses under a netmask.  The mask is used to mask
+ *   out the bits that are to be compared:  Buts within the mask much
+ *   match exactly; bits outside if the mask are ignored.
+ *
+ * Example:
+ *
+ *   net_ipv6addr_t ipaddr1;
+ *   net_ipv6addr_t ipaddr2;
+ *   net_ipv6addr_t mask;
+ *
+ *   net_ipv6addr(&mask, 255,255,255,0);
+ *   net_ipv6addr(&ipaddr1, 192,16,1,2);
+ *   net_iv6paddr(&ipaddr2, 192,16,1,3);
+ *   if (net_ipv6addr_maskcmp(ipaddr1, ipaddr2, &mask))
+ *     {
+ *       printf("They are the same");
+ *     }
+ *
+ * Parameters:
+ *   addr1 - The first IP address.
+ *   addr2 - The second IP address.
+ *   mask  - The netmask.
+ *
+ * Returned Value:
+ *   True if the address under the mask are equal
+ *
+ ****************************************************************************/
+
+bool net_ipv6addr_maskcmp(const net_ipv6addr_t addr1,
+                          const net_ipv6addr_t addr2,
+                          const net_ipv6addr_t mask)
+{
+  int i;
+
+  /* Start from the "bottom" where the addresses will most likely differ */
+
+  for (i = 7; i >= 0; i--)
+    {
+      /* Same? */
+
+      if ((addr1[i] & mask[i]) != (addr2[i] & mask[i]))
+        {
+          /* No.. the addresses are different */
+
+          return false;
+        }
+    }
+
+  /* The addresses are the same */
+
+  return true;
+}
+
+#endif /* CONFIG_NET_IPv6 */
+