initial commit

5 files changed, 812 insertions, 0 deletions

diff --git a/ext/lwip/src/core/ipv6/README b/ext/lwip/src/core/ipv6/README
new file mode 100644
index 00000000..36200048
--- /dev/null
+++ b/ext/lwip/src/core/ipv6/README
@@ -0,0 +1 @@
+IPv6 support in lwIP is very experimental.
diff --git a/ext/lwip/src/core/ipv6/icmp6.c b/ext/lwip/src/core/ipv6/icmp6.c
new file mode 100644
index 00000000..4fcc8955
--- /dev/null
+++ b/ext/lwip/src/core/ipv6/icmp6.c
@@ -0,0 +1,179 @@
+/*
+ * 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>
+ *
+ */
+
+/* Some ICMP messages should be passed to the transport protocols. This
+   is not implemented. */
+
+#include "lwip/opt.h"
+
+#if LWIP_ICMP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/icmp.h"
+#include "lwip/inet.h"
+#include "lwip/ip.h"
+#include "lwip/def.h"
+#include "lwip/stats.h"
+
+void
+icmp_input(struct pbuf *p, struct netif *inp)
+{
+  u8_t type;
+  struct icmp_echo_hdr *iecho;
+  struct ip_hdr *iphdr;
+  struct ip_addr tmpaddr;
+
+  ICMP_STATS_INC(icmp.recv);
+
+  /* TODO: check length before accessing payload! */
+
+  type = ((u8_t *)p->payload)[0];
+
+  switch (type) {
+  case ICMP6_ECHO:
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ping\n"));
+
+    if (p->tot_len < sizeof(struct icmp_echo_hdr)) {
+      LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: bad ICMP echo received\n"));
+
+      pbuf_free(p);
+      ICMP_STATS_INC(icmp.lenerr);
+      return;
+    }
+    iecho = p->payload;
+    iphdr = (struct ip_hdr *)((u8_t *)p->payload - IP_HLEN);
+    if (inet_chksum_pbuf(p) != 0) {
+      LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo (%"X16_F")\n", inet_chksum_pseudo(p, &(iphdr->src), &(iphdr->dest), IP_PROTO_ICMP, p->tot_len)));
+      ICMP_STATS_INC(icmp.chkerr);
+    /*      return;*/
+    }
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp: p->len %"S16_F" p->tot_len %"S16_F"\n", p->len, p->tot_len));
+    ip_addr_set(&tmpaddr, &(iphdr->src));
+    ip_addr_set(&(iphdr->src), &(iphdr->dest));
+    ip_addr_set(&(iphdr->dest), &tmpaddr);
+    iecho->type = ICMP6_ER;
+    /* adjust the checksum */
+    if (iecho->chksum >= htons(0xffff - (ICMP6_ECHO << 8))) {
+      iecho->chksum += htons(ICMP6_ECHO << 8) + 1;
+    } else {
+      iecho->chksum += htons(ICMP6_ECHO << 8);
+    }
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: checksum failed for received ICMP echo (%"X16_F")\n", inet_chksum_pseudo(p, &(iphdr->src), &(iphdr->dest), IP_PROTO_ICMP, p->tot_len)));
+    ICMP_STATS_INC(icmp.xmit);
+
+    /*    LWIP_DEBUGF("icmp: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
+    ip_output_if (p, &(iphdr->src), IP_HDRINCL,
+     iphdr->hoplim, IP_PROTO_ICMP, inp);
+    break;
+  default:
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_input: ICMP type %"S16_F" not supported.\n", (s16_t)type));
+    ICMP_STATS_INC(icmp.proterr);
+    ICMP_STATS_INC(icmp.drop);
+  }
+
+  pbuf_free(p);
+}
+
+void
+icmp_dest_unreach(struct pbuf *p, enum icmp_dur_type t)
+{
+  struct pbuf *q;
+  struct ip_hdr *iphdr;
+  struct icmp_dur_hdr *idur;
+
+  /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
+  q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
+  /* ICMP header + IP header + 8 bytes of data */
+  if (q == NULL) {
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
+    pbuf_free(p);
+    return;
+  }
+  LWIP_ASSERT("check that first pbuf can hold icmp message",
+             (q->len >= (8 + IP_HLEN + 8)));
+
+  iphdr = p->payload;
+
+  idur = q->payload;
+  idur->type = (u8_t)ICMP6_DUR;
+  idur->icode = (u8_t)t;
+
+  SMEMCPY((u8_t *)q->payload + 8, p->payload, IP_HLEN + 8);
+
+  /* calculate checksum */
+  idur->chksum = 0;
+  idur->chksum = inet_chksum(idur, q->len);
+  ICMP_STATS_INC(icmp.xmit);
+
+  ip_output(q, NULL,
+      (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
+  pbuf_free(q);
+}
+
+void
+icmp_time_exceeded(struct pbuf *p, enum icmp_te_type t)
+{
+  struct pbuf *q;
+  struct ip_hdr *iphdr;
+  struct icmp_te_hdr *tehdr;
+
+  LWIP_DEBUGF(ICMP_DEBUG, ("icmp_time_exceeded\n"));
+
+  /* @todo: can this be PBUF_LINK instead of PBUF_IP? */
+  q = pbuf_alloc(PBUF_IP, 8 + IP_HLEN + 8, PBUF_RAM);
+  /* ICMP header + IP header + 8 bytes of data */
+  if (q == NULL) {
+    LWIP_DEBUGF(ICMP_DEBUG, ("icmp_dest_unreach: failed to allocate pbuf for ICMP packet.\n"));
+    pbuf_free(p);
+    return;
+  }
+  LWIP_ASSERT("check that first pbuf can hold icmp message",
+             (q->len >= (8 + IP_HLEN + 8)));
+
+  iphdr = p->payload;
+
+  tehdr = q->payload;
+  tehdr->type = (u8_t)ICMP6_TE;
+  tehdr->icode = (u8_t)t;
+
+  /* copy fields from original packet */
+  SMEMCPY((u8_t *)q->payload + 8, (u8_t *)p->payload, IP_HLEN + 8);
+
+  /* calculate checksum */
+  tehdr->chksum = 0;
+  tehdr->chksum = inet_chksum(tehdr, q->len);
+  ICMP_STATS_INC(icmp.xmit);
+  ip_output(q, NULL,
+      (struct ip_addr *)&(iphdr->src), ICMP_TTL, IP_PROTO_ICMP);
+  pbuf_free(q);
+}
+
+#endif /* LWIP_ICMP */
diff --git a/ext/lwip/src/core/ipv6/inet6.c b/ext/lwip/src/core/ipv6/inet6.c
new file mode 100644
index 00000000..c3de85c0
--- /dev/null
+++ b/ext/lwip/src/core/ipv6/inet6.c
@@ -0,0 +1,163 @@
+/**
+ * @file
+ * Functions common to all TCP/IPv6 modules, such as the Internet checksum and the
+ * byte order functions.
+ *
+ */
+
+/*
+ * 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>
+ *
+ */
+
+#include "lwip/opt.h"
+
+#include "lwip/def.h"
+#include "lwip/inet.h"
+
+/* chksum:
+ *
+ * Sums up all 16 bit words in a memory portion. Also includes any odd byte.
+ * This function is used by the other checksum functions.
+ *
+ * For now, this is not optimized. Must be optimized for the particular processor
+ * arcitecture on which it is to run. Preferebly coded in assembler.
+ */
+
+static u32_t
+chksum(void *dataptr, u16_t len)
+{
+  u16_t *sdataptr = dataptr;
+  u32_t acc;
+  
+  
+  for(acc = 0; len > 1; len -= 2) {
+    acc += *sdataptr++;
+  }
+
+  /* add up any odd byte */
+  if (len == 1) {
+    acc += htons((u16_t)(*(u8_t *)dataptr) << 8);
+  }
+
+  return acc;
+
+}
+
+/* inet_chksum_pseudo:
+ *
+ * Calculates the pseudo Internet checksum used by TCP and UDP for a pbuf chain.
+ */
+
+u16_t
+inet_chksum_pseudo(struct pbuf *p,
+       struct ip_addr *src, struct ip_addr *dest,
+       u8_t proto, u32_t proto_len)
+{
+  u32_t acc;
+  struct pbuf *q;
+  u8_t swapped, i;
+
+  acc = 0;
+  swapped = 0;
+  for(q = p; q != NULL; q = q->next) {    
+    acc += chksum(q->payload, q->len);
+    while (acc >> 16) {
+      acc = (acc & 0xffff) + (acc >> 16);
+    }
+    if (q->len % 2 != 0) {
+      swapped = 1 - swapped;
+      acc = ((acc & 0xff) << 8) | ((acc & 0xff00) >> 8);
+    }
+  }
+
+  if (swapped) {
+    acc = ((acc & 0xff) << 8) | ((acc & 0xff00) >> 8);
+  }
+  
+  for(i = 0; i < 8; i++) {
+    acc += ((u16_t *)src->addr)[i] & 0xffff;
+    acc += ((u16_t *)dest->addr)[i] & 0xffff;
+    while (acc >> 16) {
+      acc = (acc & 0xffff) + (acc >> 16);
+    }
+  }
+  acc += (u16_t)htons((u16_t)proto);
+  acc += ((u16_t *)&proto_len)[0] & 0xffff;
+  acc += ((u16_t *)&proto_len)[1] & 0xffff;
+
+  while (acc >> 16) {
+    acc = (acc & 0xffff) + (acc >> 16);
+  }
+  return ~(acc & 0xffff);
+}
+
+/* inet_chksum:
+ *
+ * Calculates the Internet checksum over a portion of memory. Used primarely for IP
+ * and ICMP.
+ */
+
+u16_t
+inet_chksum(void *dataptr, u16_t len)
+{
+  u32_t acc, sum;
+
+  acc = chksum(dataptr, len);
+  sum = (acc & 0xffff) + (acc >> 16);
+  sum += (sum >> 16);
+  return ~(sum & 0xffff);
+}
+
+u16_t
+inet_chksum_pbuf(struct pbuf *p)
+{
+  u32_t acc;
+  struct pbuf *q;
+  u8_t swapped;
+  
+  acc = 0;
+  swapped = 0;
+  for(q = p; q != NULL; q = q->next) {
+    acc += chksum(q->payload, q->len);
+    while (acc >> 16) {
+      acc = (acc & 0xffff) + (acc >> 16);
+    }    
+    if (q->len % 2 != 0) {
+      swapped = 1 - swapped;
+      acc = (acc & 0xff << 8) | (acc & 0xff00 >> 8);
+    }
+  }
+ 
+  if (swapped) {
+    acc = ((acc & 0xff) << 8) | ((acc & 0xff00) >> 8);
+  }
+  return ~(acc & 0xffff);
+}
diff --git a/ext/lwip/src/core/ipv6/ip6.c b/ext/lwip/src/core/ipv6/ip6.c
new file mode 100644
index 00000000..ad59b725
--- /dev/null
+++ b/ext/lwip/src/core/ipv6/ip6.c
@@ -0,0 +1,397 @@
+/*
+ * 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>
+ *
+ */
+
+
+
+/* ip.c
+ *
+ * This is the code for the IP layer for IPv6.
+ *
+ */
+
+
+#include "lwip/opt.h"
+
+#include "lwip/def.h"
+#include "lwip/mem.h"
+#include "lwip/ip.h"
+#include "lwip/inet.h"
+#include "lwip/netif.h"
+#include "lwip/icmp.h"
+#include "lwip/udp.h"
+#include "lwip/tcp_impl.h"
+
+#include "lwip/stats.h"
+
+#include "arch/perf.h"
+
+/* ip_init:
+ *
+ * Initializes the IP layer.
+ */
+
+void
+ip_init(void)
+{
+}
+
+/* ip_route:
+ *
+ * Finds the appropriate network interface for a given IP address. It searches the
+ * list of network interfaces linearly. A match is found if the masked IP address of
+ * the network interface equals the masked IP address given to the function.
+ */
+
+struct netif *
+ip_route(struct ip_addr *dest)
+{
+  struct netif *netif;
+
+  for(netif = netif_list; netif != NULL; netif = netif->next) {
+    if (ip_addr_netcmp(dest, &(netif->ip_addr), &(netif->netmask))) {
+      return netif;
+    }
+  }
+
+  return netif_default;
+}
+
+/* ip_forward:
+ *
+ * Forwards an IP packet. It finds an appropriate route for the packet, decrements
+ * the TTL value of the packet, adjusts the checksum and outputs the packet on the
+ * appropriate interface.
+ */
+
+static void
+ip_forward(struct pbuf *p, struct ip_hdr *iphdr)
+{
+  struct netif *netif;
+
+  PERF_START;
+
+  if ((netif = ip_route((struct ip_addr *)&(iphdr->dest))) == NULL) {
+
+    LWIP_DEBUGF(IP_DEBUG, ("ip_input: no forwarding route found for "));
+#if IP_DEBUG
+    ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
+#endif /* IP_DEBUG */
+    LWIP_DEBUGF(IP_DEBUG, ("\n"));
+    pbuf_free(p);
+    return;
+  }
+  /* Decrement TTL and send ICMP if ttl == 0. */
+  if (--iphdr->hoplim == 0) {
+#if LWIP_ICMP
+    /* Don't send ICMP messages in response to ICMP messages */
+    if (iphdr->nexthdr != IP_PROTO_ICMP) {
+      icmp_time_exceeded(p, ICMP_TE_TTL);
+    }
+#endif /* LWIP_ICMP */
+    pbuf_free(p);
+    return;
+  }
+
+  /* Incremental update of the IP checksum. */
+  /*  if (iphdr->chksum >= htons(0xffff - 0x100)) {
+    iphdr->chksum += htons(0x100) + 1;
+  } else {
+    iphdr->chksum += htons(0x100);
+    }*/
+
+
+  LWIP_DEBUGF(IP_DEBUG, ("ip_forward: forwarding packet to "));
+#if IP_DEBUG
+  ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
+#endif /* IP_DEBUG */
+  LWIP_DEBUGF(IP_DEBUG, ("\n"));
+
+  IP_STATS_INC(ip.fw);
+  IP_STATS_INC(ip.xmit);
+
+  PERF_STOP("ip_forward");
+
+  netif->output(netif, p, (struct ip_addr *)&(iphdr->dest));
+}
+
+/* ip_input:
+ *
+ * This function is called by the network interface device driver when an IP packet is
+ * received. The function does the basic checks of the IP header such as packet size
+ * being at least larger than the header size etc. If the packet was not destined for
+ * us, the packet is forwarded (using ip_forward). The IP checksum is always checked.
+ *
+ * Finally, the packet is sent to the upper layer protocol input function.
+ */
+
+void
+ip_input(struct pbuf *p, struct netif *inp) {
+  struct ip_hdr *iphdr;
+  struct netif *netif;
+
+
+  PERF_START;
+
+#if IP_DEBUG
+  ip_debug_print(p);
+#endif /* IP_DEBUG */
+
+
+  IP_STATS_INC(ip.recv);
+
+  /* identify the IP header */
+  iphdr = p->payload;
+
+
+  if (iphdr->v != 6) {
+    LWIP_DEBUGF(IP_DEBUG, ("IP packet dropped due to bad version number\n"));
+#if IP_DEBUG
+    ip_debug_print(p);
+#endif /* IP_DEBUG */
+    pbuf_free(p);
+    IP_STATS_INC(ip.err);
+    IP_STATS_INC(ip.drop);
+    return;
+  }
+
+  /* is this packet for us? */
+  for(netif = netif_list; netif != NULL; netif = netif->next) {
+#if IP_DEBUG
+    LWIP_DEBUGF(IP_DEBUG, ("ip_input: iphdr->dest "));
+    ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
+    LWIP_DEBUGF(IP_DEBUG, ("netif->ip_addr "));
+    ip_addr_debug_print(IP_DEBUG, ((struct ip_addr *)&(iphdr->dest)));
+    LWIP_DEBUGF(IP_DEBUG, ("\n"));
+#endif /* IP_DEBUG */
+    if (ip_addr_cmp(&(iphdr->dest), &(netif->ip_addr))) {
+      break;
+    }
+  }
+
+
+  if (netif == NULL) {
+    /* packet not for us, route or discard */
+#if IP_FORWARD
+    ip_forward(p, iphdr);
+#endif
+    pbuf_free(p);
+    return;
+  }
+
+  pbuf_realloc(p, IP_HLEN + ntohs(iphdr->len));
+
+  /* send to upper layers */
+#if IP_DEBUG
+  /*  LWIP_DEBUGF("ip_input: \n");
+  ip_debug_print(p);
+  LWIP_DEBUGF("ip_input: p->len %"U16_F" p->tot_len %"U16_F"\n", p->len, p->tot_len);*/
+#endif /* IP_DEBUG */
+
+  if(pbuf_header(p, -IP_HLEN)) {
+    LWIP_ASSERT("Can't move over header in packet", 0);
+    return;
+  }
+
+  switch (iphdr->nexthdr) {
+  case IP_PROTO_UDP:
+    udp_input(p, inp);
+    break;
+  case IP_PROTO_TCP:
+    tcp_input(p, inp);
+    break;
+#if LWIP_ICMP
+  case IP_PROTO_ICMP:
+    icmp_input(p, inp);
+    break;
+#endif /* LWIP_ICMP */
+  default:
+#if LWIP_ICMP
+    /* send ICMP destination protocol unreachable */
+    icmp_dest_unreach(p, ICMP_DUR_PROTO);
+#endif /* LWIP_ICMP */
+    pbuf_free(p);
+    LWIP_DEBUGF(IP_DEBUG, ("Unsupported transport protocol %"U16_F"\n",
+          iphdr->nexthdr));
+
+    IP_STATS_INC(ip.proterr);
+    IP_STATS_INC(ip.drop);
+  }
+  PERF_STOP("ip_input");
+}
+
+
+/* ip_output_if:
+ *
+ * Sends an IP packet on a network interface. This function constructs the IP header
+ * and calculates the IP header checksum. If the source IP address is NULL,
+ * the IP address of the outgoing network interface is filled in as source address.
+ */
+
+err_t
+ip_output_if (struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+       u8_t ttl,
+       u8_t proto, struct netif *netif)
+{
+  struct ip_hdr *iphdr;
+
+  PERF_START;
+
+  LWIP_DEBUGF(IP_DEBUG, ("len %"U16_F" tot_len %"U16_F"\n", p->len, p->tot_len));
+  if (pbuf_header(p, IP_HLEN)) {
+    LWIP_DEBUGF(IP_DEBUG, ("ip_output: not enough room for IP header in pbuf\n"));
+    IP_STATS_INC(ip.err);
+
+    return ERR_BUF;
+  }
+  LWIP_DEBUGF(IP_DEBUG, ("len %"U16_F" tot_len %"U16_F"\n", p->len, p->tot_len));
+
+  iphdr = p->payload;
+
+
+  if (dest != IP_HDRINCL) {
+    LWIP_DEBUGF(IP_DEBUG, ("!IP_HDRLINCL\n"));
+    iphdr->hoplim = ttl;
+    iphdr->nexthdr = proto;
+    iphdr->len = htons(p->tot_len - IP_HLEN);
+    ip_addr_set(&(iphdr->dest), dest);
+
+    iphdr->v = 6;
+
+    if (ip_addr_isany(src)) {
+      ip_addr_set(&(iphdr->src), &(netif->ip_addr));
+    } else {
+      ip_addr_set(&(iphdr->src), src);
+    }
+
+  } else {
+    dest = &(iphdr->dest);
+  }
+
+  IP_STATS_INC(ip.xmit);
+
+  LWIP_DEBUGF(IP_DEBUG, ("ip_output_if: %c%c (len %"U16_F")\n", netif->name[0], netif->name[1], p->tot_len));
+#if IP_DEBUG
+  ip_debug_print(p);
+#endif /* IP_DEBUG */
+
+  PERF_STOP("ip_output_if");
+  return netif->output(netif, p, dest);
+}
+
+/* ip_output:
+ *
+ * Simple interface to ip_output_if. It finds the outgoing network interface and
+ * calls upon ip_output_if to do the actual work.
+ */
+
+err_t
+ip_output(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+    u8_t ttl, u8_t proto)
+{
+  struct netif *netif;
+  if ((netif = ip_route(dest)) == NULL) {
+    LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
+    IP_STATS_INC(ip.rterr);
+    return ERR_RTE;
+  }
+
+  return ip_output_if (p, src, dest, ttl, proto, netif);
+}
+
+#if LWIP_NETIF_HWADDRHINT
+err_t
+ip_output_hinted(struct pbuf *p, struct ip_addr *src, struct ip_addr *dest,
+          u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint)
+{
+  struct netif *netif;
+  err_t err;
+
+  if ((netif = ip_route(dest)) == NULL) {
+    LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to 0x%"X32_F"\n", dest->addr));
+    IP_STATS_INC(ip.rterr);
+    return ERR_RTE;
+  }
+
+  LWIP_NETIF_HWADDRHINT(netif, addr_hint);
+  err = ip_output_if(p, src, dest, ttl, tos, proto, netif);
+  LWIP_NETIF_HWADDRHINT(netif, NULL);
+
+  return err;
+}
+#endif /* LWIP_NETIF_HWADDRHINT*/
+
+#if IP_DEBUG
+void
+ip_debug_print(struct pbuf *p)
+{
+  struct ip_hdr *iphdr = p->payload;
+
+  LWIP_DEBUGF(IP_DEBUG, ("IP header:\n"));
+  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+  LWIP_DEBUGF(IP_DEBUG, ("|%2"S16_F" |  %"X16_F"%"X16_F"  |      %"X16_F"%"X16_F"           | (v, traffic class, flow label)\n",
+        iphdr->v,
+        iphdr->tclass1, iphdr->tclass2,
+        iphdr->flow1, iphdr->flow2));
+  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+  LWIP_DEBUGF(IP_DEBUG, ("|    %5"U16_F"      | %2"U16_F"  |  %2"U16_F"   | (len, nexthdr, hoplim)\n",
+        ntohs(iphdr->len),
+        iphdr->nexthdr,
+        iphdr->hoplim));
+  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (src)\n",
+        (ntohl(iphdr->src.addr[0]) >> 16) & 0xffff,
+        ntohl(iphdr->src.addr[0]) & 0xffff));
+  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (src)\n",
+        (ntohl(iphdr->src.addr[1]) >> 16) & 0xffff,
+        ntohl(iphdr->src.addr[1]) & 0xffff));
+  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (src)\n",
+        (ntohl(iphdr->src.addr[2]) >> 16) & 0xffff,
+        ntohl(iphdr->src.addr[2]) & 0xffff));
+  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (src)\n",
+        (ntohl(iphdr->src.addr[3]) >> 16) & 0xffff,
+        ntohl(iphdr->src.addr[3]) & 0xffff));
+  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (dest)\n",
+        (ntohl(iphdr->dest.addr[0]) >> 16) & 0xffff,
+        ntohl(iphdr->dest.addr[0]) & 0xffff));
+  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (dest)\n",
+        (ntohl(iphdr->dest.addr[1]) >> 16) & 0xffff,
+        ntohl(iphdr->dest.addr[1]) & 0xffff));
+  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (dest)\n",
+        (ntohl(iphdr->dest.addr[2]) >> 16) & 0xffff,
+        ntohl(iphdr->dest.addr[2]) & 0xffff));
+  LWIP_DEBUGF(IP_DEBUG, ("|       %4"X32_F"      |       %4"X32_F"     | (dest)\n",
+        (ntohl(iphdr->dest.addr[3]) >> 16) & 0xffff,
+        ntohl(iphdr->dest.addr[3]) & 0xffff));
+  LWIP_DEBUGF(IP_DEBUG, ("+-------------------------------+\n"));
+}
+#endif /* IP_DEBUG */
diff --git a/ext/lwip/src/core/ipv6/ip6_addr.c b/ext/lwip/src/core/ipv6/ip6_addr.c
new file mode 100644
index 00000000..2da6cea4
--- /dev/null
+++ b/ext/lwip/src/core/ipv6/ip6_addr.c
@@ -0,0 +1,72 @@
+/*
+ * 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>
+ *
+ */
+
+#include "lwip/opt.h"
+#include "lwip/ip_addr.h"
+#include "lwip/inet.h"
+
+u8_t
+ip_addr_netcmp(struct ip_addr *addr1, struct ip_addr *addr2,
+                struct ip_addr *mask)
+{
+  return((addr1->addr[0] & mask->addr[0]) == (addr2->addr[0] & mask->addr[0]) &&
+         (addr1->addr[1] & mask->addr[1]) == (addr2->addr[1] & mask->addr[1]) &&
+         (addr1->addr[2] & mask->addr[2]) == (addr2->addr[2] & mask->addr[2]) &&
+         (addr1->addr[3] & mask->addr[3]) == (addr2->addr[3] & mask->addr[3]));
+        
+}
+
+u8_t
+ip_addr_cmp(struct ip_addr *addr1, struct ip_addr *addr2)
+{
+  return(addr1->addr[0] == addr2->addr[0] &&
+         addr1->addr[1] == addr2->addr[1] &&
+         addr1->addr[2] == addr2->addr[2] &&
+         addr1->addr[3] == addr2->addr[3]);
+}
+
+void
+ip_addr_set(struct ip_addr *dest, struct ip_addr *src)
+{
+  SMEMCPY(dest, src, sizeof(struct ip_addr));
+  /*  dest->addr[0] = src->addr[0];
+  dest->addr[1] = src->addr[1];
+  dest->addr[2] = src->addr[2];
+  dest->addr[3] = src->addr[3];*/
+}
+
+u8_t
+ip_addr_isany(struct ip_addr *addr)
+{
+  if (addr == NULL) return 1;
+  return((addr->addr[0] | addr->addr[1] | addr->addr[2] | addr->addr[3]) == 0);
+}