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diff --git a/lwip/src/include/lwip/ip6_frag.h b/lwip/src/include/lwip/ip6_frag.h
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+++ b/lwip/src/include/lwip/ip6_frag.h
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+/**
+ * @file
+ *
+ * IPv6 fragmentation and reassembly.
+ */
+
+/*
+ * Copyright (c) 2010 Inico Technologies Ltd.
+ * 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: Ivan Delamer <delamer@inicotech.com>
+ *
+ *
+ * Please coordinate changes and requests with Ivan Delamer
+ * <delamer@inicotech.com>
+ */
+#ifndef LWIP_HDR_IP6_FRAG_H
+#define LWIP_HDR_IP6_FRAG_H
+
+#include "lwip/opt.h"
+#include "lwip/pbuf.h"
+#include "lwip/ip6_addr.h"
+#include "lwip/ip6.h"
+#include "lwip/netif.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+#if LWIP_IPV6 && LWIP_IPV6_REASS  /* don't build if not configured for use in lwipopts.h */
+
+/** The IPv6 reassembly timer interval in milliseconds. */
+#define IP6_REASS_TMR_INTERVAL 1000
+
+/** IP6_FRAG_COPYHEADER==1: for platforms where sizeof(void*) > 4, "struct
+ * ip6_reass_helper" is too large to be stored in the IPv6 fragment header, and
+ * will bleed into the header before it, which may be the IPv6 header or an
+ * extension header. This means that for each first fragment packet, we need to
+ * 1) make a copy of some IPv6 header fields (src+dest) that we need later on,
+ * just in case we do overwrite part of the IPv6 header, and 2) make a copy of
+ * the header data that we overwrote, so that we can restore it before either
+ * completing reassembly or sending an ICMPv6 reply. The last part is true even
+ * if this setting is disabled, but if it is enabled, we need to save a bit
+ * more data (up to the size of a pointer) because we overwrite more. */
+#ifndef IPV6_FRAG_COPYHEADER
+#define IPV6_FRAG_COPYHEADER   0
+#endif
+
+/* With IPV6_FRAG_COPYHEADER==1, a helper structure may (or, depending on the
+ * presence of extensions, may not) overwrite part of the IP header. Therefore,
+ * we copy the fields that we need from the IP header for as long as the helper
+ * structure may still be in place. This is easier than temporarily restoring
+ * those fields in the IP header each time we need to perform checks on them. */
+#if IPV6_FRAG_COPYHEADER
+#define IPV6_FRAG_SRC(ipr) ((ipr)->src)
+#define IPV6_FRAG_DEST(ipr) ((ipr)->dest)
+#else /* IPV6_FRAG_COPYHEADER */
+#define IPV6_FRAG_SRC(ipr) ((ipr)->iphdr->src)
+#define IPV6_FRAG_DEST(ipr) ((ipr)->iphdr->dest)
+#endif /* IPV6_FRAG_COPYHEADER */
+
+/** IPv6 reassembly helper struct.
+ * This is exported because memp needs to know the size.
+ */
+struct ip6_reassdata {
+  struct ip6_reassdata *next;
+  struct pbuf *p;
+  struct ip6_hdr *iphdr; /* pointer to the first (original) IPv6 header */
+#if IPV6_FRAG_COPYHEADER
+  ip6_addr_p_t src; /* copy of the source address in the IP header */
+  ip6_addr_p_t dest; /* copy of the destination address in the IP header */
+  /* This buffer (for the part of the original header that we overwrite) will
+   * be slightly oversized, but we cannot compute the exact size from here. */
+  u8_t orig_hdr[sizeof(struct ip6_frag_hdr) + sizeof(void*)];
+#else /* IPV6_FRAG_COPYHEADER */
+  /* In this case we still need the buffer, for sending ICMPv6 replies. */
+  u8_t orig_hdr[sizeof(struct ip6_frag_hdr)];
+#endif /* IPV6_FRAG_COPYHEADER */
+  u32_t identification;
+  u16_t datagram_len;
+  u8_t nexth;
+  u8_t timer;
+#if LWIP_IPV6_SCOPES
+  u8_t src_zone; /* zone of original packet's source address */
+  u8_t dest_zone; /* zone of original packet's destination address */
+#endif /* LWIP_IPV6_SCOPES */
+};
+
+#define ip6_reass_init() /* Compatibility define */
+void ip6_reass_tmr(void);
+struct pbuf *ip6_reass(struct pbuf *p);
+
+#endif /* LWIP_IPV6 && LWIP_IPV6_REASS */
+
+#if LWIP_IPV6 && LWIP_IPV6_FRAG  /* don't build if not configured for use in lwipopts.h */
+
+#ifndef LWIP_PBUF_CUSTOM_REF_DEFINED
+#define LWIP_PBUF_CUSTOM_REF_DEFINED
+/** A custom pbuf that holds a reference to another pbuf, which is freed
+ * when this custom pbuf is freed. This is used to create a custom PBUF_REF
+ * that points into the original pbuf. */
+struct pbuf_custom_ref {
+  /** 'base class' */
+  struct pbuf_custom pc;
+  /** pointer to the original pbuf that is referenced */
+  struct pbuf *original;
+};
+#endif /* LWIP_PBUF_CUSTOM_REF_DEFINED */
+
+err_t ip6_frag(struct pbuf *p, struct netif *netif, const ip6_addr_t *dest);
+
+#endif /* LWIP_IPV6 && LWIP_IPV6_FRAG */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_IP6_FRAG_H */