--- /dev/null
+/**
+ * @file
+ * This is the IPv4 address tools implementation.
+ *
+ */
+
+/*
+ * 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"
+#include "lwip/netif.h"
+
+#define IP_ADDR_ANY_VALUE 0x00000000UL
+#define IP_ADDR_BROADCAST_VALUE 0xffffffffUL
+
+/* used by IP_ADDR_ANY and IP_ADDR_BROADCAST in ip_addr.h */
+const struct ip_addr ip_addr_any = { IP_ADDR_ANY_VALUE };
+const struct ip_addr ip_addr_broadcast = { IP_ADDR_BROADCAST_VALUE };
+
+/**
+ * Determine if an address is a broadcast address on a network interface
+ *
+ * @param addr address to be checked
+ * @param netif the network interface against which the address is checked
+ * @return returns non-zero if the address is a broadcast address
+ */
+u8_t ip_addr_isbroadcast(struct ip_addr *addr, struct netif *netif)
+{
+ u32_t addr2test;
+
+ addr2test = addr->addr;
+ /* all ones (broadcast) or all zeroes (old skool broadcast) */
+ if ((~addr2test == IP_ADDR_ANY_VALUE) ||
+ (addr2test == IP_ADDR_ANY_VALUE))
+ return 1;
+ /* no broadcast support on this network interface? */
+ else if ((netif->flags & NETIF_FLAG_BROADCAST) == 0)
+ /* the given address cannot be a broadcast address
+ * nor can we check against any broadcast addresses */
+ return 0;
+ /* address matches network interface address exactly? => no broadcast */
+ else if (addr2test == netif->ip_addr.addr)
+ return 0;
+ /* on the same (sub) network... */
+ else if (ip_addr_netcmp(addr, &(netif->ip_addr), &(netif->netmask))
+ /* ...and host identifier bits are all ones? =>... */
+ && ((addr2test & ~netif->netmask.addr) ==
+ (IP_ADDR_BROADCAST_VALUE & ~netif->netmask.addr)))
+ /* => network broadcast address */
+ return 1;
+ else
+ return 0;
+}
