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diff --git a/geekos/include/lwip/ipv6/lwip/ip_addr.h b/geekos/include/lwip/ipv6/lwip/ip_addr.h
new file mode 100644
index 0000000..b2d8ae5
--- /dev/null
+++ b/geekos/include/lwip/ipv6/lwip/ip_addr.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
+ * All rights reserved. 
+ * 
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ *
+ * This file is part of the lwIP TCP/IP stack.
+ * 
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ */
+#ifndef __LWIP_IP_ADDR_H__
+#define __LWIP_IP_ADDR_H__
+
+#include "lwip/opt.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define IP_ADDR_ANY 0
+
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+ struct ip_addr {
+  PACK_STRUCT_FIELD(u32_t addr[4]);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/epstruct.h"
+#endif
+
+/*
+ * struct ipaddr2 is used in the definition of the ARP packet format in
+ * order to support compilers that don't have structure packing.
+ */
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+struct ip_addr2 {
+  PACK_STRUCT_FIELD(u16_t addrw[2]);
+} PACK_STRUCT_STRUCT;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+#  include "arch/epstruct.h"
+#endif
+
+#define IP6_ADDR(ipaddr, a,b,c,d,e,f,g,h) do { (ipaddr)->addr[0] = htonl((u32_t)((a & 0xffff) << 16) | (b & 0xffff)); \
+                                               (ipaddr)->addr[1] = htonl(((c & 0xffff) << 16) | (d & 0xffff)); \
+                                               (ipaddr)->addr[2] = htonl(((e & 0xffff) << 16) | (f & 0xffff)); \
+                                               (ipaddr)->addr[3] = htonl(((g & 0xffff) << 16) | (h & 0xffff)); } while(0)
+
+u8_t ip_addr_netcmp(struct ip_addr *addr1, struct ip_addr *addr2,
+        struct ip_addr *mask);
+u8_t ip_addr_cmp(struct ip_addr *addr1, struct ip_addr *addr2);
+void ip_addr_set(struct ip_addr *dest, struct ip_addr *src);
+u8_t ip_addr_isany(struct ip_addr *addr);
+
+#define ip_addr_debug_print(debug, ipaddr) \
+        LWIP_DEBUGF(debug, ("%"X32_F":%"X32_F":%"X32_F":%"X32_F":%"X32_F":%"X32_F":%"X32_F":%"X32_F"\n", \
+         (ntohl(ipaddr->addr[0]) >> 16) & 0xffff, \
+         ntohl(ipaddr->addr[0]) & 0xffff, \
+         (ntohl(ipaddr->addr[1]) >> 16) & 0xffff, \
+         ntohl(ipaddr->addr[1]) & 0xffff, \
+         (ntohl(ipaddr->addr[2]) >> 16) & 0xffff, \
+         ntohl(ipaddr->addr[2]) & 0xffff, \
+         (ntohl(ipaddr->addr[3]) >> 16) & 0xffff, \
+         ntohl(ipaddr->addr[3]) & 0xffff));
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LWIP_IP_ADDR_H__ */