1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/interceptor/sshinetbits.c b/drivers/interceptor/sshinetbits.c
new file mode 100644
index 0000000..6a77ef8
--- /dev/null
+++ b/drivers/interceptor/sshinetbits.c
@@ -0,0 +1,45 @@
+/* Netfilter Driver for IPSec VPN Client
+ *
+ * Copyright(c)   2012 Samsung Electronics
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * sshinetbits.c
+ *
+ * Implementation of inet API IP address bit manipulation functions.
+ *
+ */
+
+#include "sshincludes.h"
+#include "sshinet.h"
+
+/* Sets all rightmost bits after keeping `keep_bits' bits on the left to
+   the value specified by `value'. */
+
+void ssh_ipaddr_set_bits(SshIpAddr result, SshIpAddr ip,
+                         unsigned int keep_bits, unsigned int value)
+{
+  size_t len;
+  unsigned int i;
+
+  len = SSH_IP_IS6(ip) ? 16 : 4;
+
+  *result = *ip;
+  for (i = keep_bits / 8; i < len; i++)
+    {
+      if (8 * i >= keep_bits)
+        result->addr_data[i] = value ? 0xff : 0;
+      else
+        {
+          SSH_ASSERT(keep_bits - 8 * i < 8);
+          result->addr_data[i] &= (0xff << (8 - (keep_bits - 8 * i)));
+          if (value)
+            result->addr_data[i] |= (0xff >> (keep_bits - 8 * i));
+        }
+    }
+}