Cleanup: Create new file ip.c and move dual-stack code from ipv4 and ipv6 folder in there

src/core/ipv6/ip6.c

@@ -59,11 +59,6 @@
 #include "lwip/debug.h"
 #include "lwip/stats.h"
 
-#if !LWIP_IPV4
-/** Global data for IPv6 only */
-struct ip_globals ip_data;
-#endif /* !LWIP_IPV4 */
-
 /**
  * Finds the appropriate network interface for a given IPv6 address. It tries to select
  * a netif following a sequence of heuristics:
@@ -374,18 +369,6 @@ ip6_forward(struct pbuf *p, struct ip6_hdr *iphdr, struct netif *inp)
 }
 #endif /* LWIP_IPV6_FORWARD */
 
-#if !LWIP_IPV4
-/* If both IP versions are enabled, this function can dispatch packets to the correct one.
- * If only IPv6 is enabled, this directly maps at ip6_input.
- * May be used as netif input function.
- */
-err_t
-ip_input(struct pbuf *p, struct netif *inp)
-{
-  return ip6_input(p, inp);
-}
-#endif /* !LWIP_IPV4 */
-
 /**
  * This function is called by the network interface device driver when
  * an IPv6 packet is received. The function does the basic checks of the

src/core/ipv6/ip6_addr.c

@@ -289,39 +289,4 @@ ip6addr_ntoa_r(const ip6_addr_t *addr, char *buf, int buflen)
   return buf;
 }
 
-#if LWIP_IPV4
-/** 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;
-}
-#endif /* LWIP_IPV4 */
-
 #endif /* LWIP_IPV6 */