Squashed 'lib/lwip/lwip/' content from commit 0a0452b2c39b

git-subtree-dir: lib/lwip/lwip
git-subtree-split: 0a0452b2c39bdd91e252aef045c115f88f6ca773

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diff --git a/src/include/lwip/prot/acd.h b/src/include/lwip/prot/acd.h
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+/**
+ * @file
+ * ACD protocol definitions
+ */
+
+/*
+ *
+ * Copyright (c) 2007 Dominik Spies <kontakt@dspies.de>
+ * Copyright (c) 2018 Jasper Verschueren <jasper.verschueren@apart-audio.com>
+ * 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: Jasper Verschueren <jasper.verschueren@apart-audio.com>
+ * Author: Dominik Spies <kontakt@dspies.de>
+ */
+
+#ifndef LWIP_HDR_PROT_ACD_H
+#define LWIP_HDR_PROT_ACD_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* RFC 5227 and 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 (minimum interval between defensive ARPs) */
+
+/* ACD states */
+typedef enum {
+  /* ACD is module is off */
+  ACD_STATE_OFF,
+  /* Waiting before probing can be started */
+  ACD_STATE_PROBE_WAIT,
+  /* Probing the ipaddr */
+  ACD_STATE_PROBING,
+  /* Waiting before announcing the probed ipaddr */
+  ACD_STATE_ANNOUNCE_WAIT,
+  /* Announcing the new ipaddr */
+  ACD_STATE_ANNOUNCING,
+  /* Performing ongoing conflict detection with one defend within defend inferval */
+  ACD_STATE_ONGOING,
+  /* Performing ongoing conflict detection but immediately back off and Release
+   * the address when a conflict occurs. This state is used for LL addresses
+   * that stay active even if the netif has a routable address selected.
+   * In such a case, we cannot defend our address */
+  ACD_STATE_PASSIVE_ONGOING,
+  /* To many conflicts occurred, we need to wait before restarting the selection
+   * process */
+  ACD_STATE_RATE_LIMIT
+} acd_state_enum_t;
+
+typedef enum {
+  ACD_IP_OK,            /* IP address is good, no conflicts found in checking state */
+  ACD_RESTART_CLIENT,   /* Conflict found -> the client should try again */
+  ACD_DECLINE           /* Decline the received IP address (rate limiting)*/
+} acd_callback_enum_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_HDR_PROT_ACD_H */