--- /dev/null
+/**
+ * @file
+ *
+ * AutoIP Automatic LinkLocal IP Configuration
+ */
+
+/*
+ *
+ * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
+ * 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.
+ *
+ * Author: Dominik Spies <kontakt@dspies.de>
+ *
+ * This is a AutoIP implementation for the lwIP TCP/IP stack. It aims to conform
+ * with RFC 3927.
+ *
+ *
+ * Please coordinate changes and requests with Dominik Spies
+ * <kontakt@dspies.de>
+ */
+
+#ifndef __LWIP_AUTOIP_H__
+#define __LWIP_AUTOIP_H__
+
+#include "lwip/opt.h"
+
+#if LWIP_AUTOIP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/netif.h"
+#include "lwip/udp.h"
+#include "netif/etharp.h"
+
+/* AutoIP Timing */
+#define AUTOIP_TMR_INTERVAL 100
+#define AUTOIP_TICKS_PER_SECOND (1000 / AUTOIP_TMR_INTERVAL)
+
+/* RFC 3927 Constants */
+#define PROBE_WAIT 1 /* second (initial random delay) */
+#define PROBE_MIN 1 /* second (minimum delay till repeated probe) */
+#define PROBE_MAX 2 /* seconds (maximum delay till repeated probe) */
+#define PROBE_NUM 3 /* (number of probe packets) */
+#define ANNOUNCE_NUM 2 /* (number of announcement packets) */
+#define ANNOUNCE_INTERVAL 2 /* seconds (time between announcement packets) */
+#define ANNOUNCE_WAIT 2 /* seconds (delay before announcing) */
+#define MAX_CONFLICTS 10 /* (max conflicts before rate limiting) */
+#define RATE_LIMIT_INTERVAL 60 /* seconds (delay between successive attempts) */
+#define DEFEND_INTERVAL 10 /* seconds (min. wait between defensive ARPs) */
+
+/* AutoIP client states */
+#define AUTOIP_STATE_OFF 0
+#define AUTOIP_STATE_PROBING 1
+#define AUTOIP_STATE_ANNOUNCING 2
+#define AUTOIP_STATE_BOUND 3
+
+struct autoip
+{
+ struct ip_addr llipaddr; /* the currently selected, probed, announced or used LL IP-Address */
+ u8_t state; /* current AutoIP state machine state */
+ u8_t sent_num; /* sent number of probes or announces, dependent on state */
+ u16_t ttw; /* ticks to wait, tick is AUTOIP_TMR_INTERVAL long */
+ u8_t lastconflict; /* ticks until a conflict can be solved by defending */
+ u8_t tried_llipaddr; /* total number of probed/used Link Local IP-Addresses */
+};
+
+
+/** Init srand, has to be called before entering mainloop */
+void autoip_init(void);
+
+/** Start AutoIP client */
+err_t autoip_start(struct netif *netif);
+
+/** Stop AutoIP client */
+err_t autoip_stop(struct netif *netif);
+
+/** Handles every incoming ARP Packet, called by etharp_arp_input */
+void autoip_arp_reply(struct netif *netif, struct etharp_hdr *hdr);
+
+/** Has to be called in loop every AUTOIP_TMR_INTERVAL milliseconds */
+void autoip_tmr(void);
+
+#endif /* LWIP_AUTOIP */
+
+#endif /* __LWIP_AUTOIP_H__ */
