lwip_ip.c

00001 /**
00002  * @file ip.c
00003  * Common IPv4 and IPv6 code
00004  *
00005  */
00006 
00007 /*
00008  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
00009  * All rights reserved.
00010  *
00011  * Redistribution and use in source and binary forms, with or without modification,
00012  * are permitted provided that the following conditions are met:
00013  *
00014  * 1. Redistributions of source code must retain the above copyright notice,
00015  *    this list of conditions and the following disclaimer.
00016  * 2. Redistributions in binary form must reproduce the above copyright notice,
00017  *    this list of conditions and the following disclaimer in the documentation
00018  *    and/or other materials provided with the distribution.
00019  * 3. The name of the author may not be used to endorse or promote products
00020  *    derived from this software without specific prior written permission.
00021  *
00022  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
00023  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00024  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
00025  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00026  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
00027  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00028  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00029  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
00030  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
00031  * OF SUCH DAMAGE.
00032  *
00033  * This file is part of the lwIP TCP/IP stack.
00034  *
00035  * Author: Adam Dunkels <adam@sics.se>
00036  *
00037  */
00038 
00039 /**
00040  * @defgroup ip4 IPv4
00041  * @ingroup callbackstyle_api
00042  *
00043  * @defgroup ip6 IPv6
00044  * @ingroup callbackstyle_api
00045  * 
00046  * @defgroup ipaddr IP address handling
00047  * @ingroup infrastructure
00048  * 
00049  * @defgroup ip4addr IPv4 only
00050  * @ingroup ipaddr
00051  * 
00052  * @defgroup ip6addr IPv6 only
00053  * @ingroup ipaddr
00054  */
00055 
00056 #include "lwip/opt.h"
00057 
00058 #if LWIP_IPV4 || LWIP_IPV6
00059 
00060 #include "lwip/ip_addr.h"
00061 #include "lwip/ip.h"
00062 
00063 /** Global data for both IPv4 and IPv6 */
00064 struct ip_globals ip_data;
00065 
00066 #if LWIP_IPV4 && LWIP_IPV6
00067 
00068 const ip_addr_t ip_addr_any_type = IPADDR_ANY_TYPE_INIT;
00069 
00070 /**
00071  * @ingroup ipaddr
00072  * Convert IP address string (both versions) to numeric.
00073  * The version is auto-detected from the string.
00074  *
00075  * @param cp IP address string to convert
00076  * @param addr conversion result is stored here
00077  * @return 1 on success, 0 on error
00078  */
00079 int
00080 ipaddr_aton(const char *cp, ip_addr_t *addr)
00081 {
00082   if (cp != NULL) {
00083     const char* c;
00084     for (c = cp; *c != 0; c++) {
00085       if (*c == ':') {
00086         /* contains a colon: IPv6 address */
00087         if (addr) {
00088           IP_SET_TYPE_VAL(*addr, IPADDR_TYPE_V6);
00089         }
00090         return ip6addr_aton(cp, ip_2_ip6(addr));
00091       } else if (*c == '.') {
00092         /* contains a dot: IPv4 address */
00093         break;
00094       }
00095     }
00096     /* call ip4addr_aton as fallback or if IPv4 was found */
00097     if (addr) {
00098       IP_SET_TYPE_VAL(*addr, IPADDR_TYPE_V4);
00099     }
00100     return ip4addr_aton(cp, ip_2_ip4(addr));
00101   }
00102   return 0;
00103 }
00104 
00105 /**
00106  * @ingroup lwip_nosys
00107  * If both IP versions are enabled, this function can dispatch packets to the correct one.
00108  * Don't call directly, pass to netif_add() and call netif->input().
00109  */
00110 err_t
00111 ip_input(struct pbuf *p, struct netif *inp)
00112 {
00113   if (p != NULL) {
00114     if (IP_HDR_GET_VERSION(p->payload) == 6) {
00115       return ip6_input(p, inp);
00116     }
00117     return ip4_input(p, inp);
00118   }
00119   return ERR_VAL;
00120 }
00121 
00122 #endif /* LWIP_IPV4 && LWIP_IPV6 */
00123 
00124 #endif /* LWIP_IPV4 || LWIP_IPV6 */