text: /**
   * @file
   * Common IPv4 and IPv6 code
   *
   * @defgroup ip IP
   * @ingroup callbackstyle_api
   * 
   * @defgroup ip4 IPv4
   * @ingroup ip
   *
   * @defgroup ip6 IPv6
   * @ingroup ip
   * 
   * @defgroup ipaddr IP address handling
   * @ingroup infrastructure
   * 
   * @defgroup ip4addr IPv4 only
   * @ingroup ipaddr
   * 
   * @defgroup ip6addr IPv6 only
   * @ingroup ipaddr
   */
  
  /*
   * 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 "ETH_LWIP/lwip/include/lwip/opt.h"
  
  #if LWIP_IPV4 || LWIP_IPV6
  
  #include "ETH_LWIP/lwip/include/lwip/ip_addr.h"
  #include "ETH_LWIP/lwip/include/lwip/ip.h"
  
  /** Global data for both IPv4 and IPv6 */
  struct ip_globals ip_data;
  
  #if LWIP_IPV4 && LWIP_IPV6
  
  const ip_addr_t ip_addr_any_type = IPADDR_ANY_TYPE_INIT;
  
  /**
   * @ingroup ipaddr
   * Convert IP address string (both versions) to numeric.
   * The version is auto-detected from the string.
   *
   * @param cp IP address string to convert
   * @param addr conversion result is stored here
   * @return 1 on success, 0 on error
   */
  int
  ipaddr_aton(const char *cp, ip_addr_t *addr)
  {
    if (cp != NULL) {
      const char* c;
      for (c = cp; *c != 0; c++) {
        if (*c == ':') {
          /* contains a colon: IPv6 address */
          if (addr) {
            IP_SET_TYPE_VAL(*addr, IPADDR_TYPE_V6);
          }
          return ip6addr_aton(cp, ip_2_ip6(addr));
        } else if (*c == '.') {
          /* contains a dot: IPv4 address */
          break;
        }
      }
      /* call ip4addr_aton as fallback or if IPv4 was found */
      if (addr) {
        IP_SET_TYPE_VAL(*addr, IPADDR_TYPE_V4);
      }
      return ip4addr_aton(cp, ip_2_ip4(addr));
    }
    return 0;
  }
  
  /**
   * @ingroup lwip_nosys
   * If both IP versions are enabled, this function can dispatch packets to the correct one.
   * Don't call directly, pass to netif_add() and call netif->input().
   */
  err_t
  ip_input(struct pbuf *p, struct netif *inp)
  {
    if (p != NULL) {
      if (IP_HDR_GET_VERSION(p->payload) == 6) {
        return ip6_input(p, inp);
      }
      return ip4_input(p, inp);
    }
    return ERR_VAL;
  }
  
  #endif /* LWIP_IPV4 && LWIP_IPV6 */
  
  #endif /* LWIP_IPV4 || LWIP_IPV6 */
  