/*
 * Copyright (c) 2001-2003 Swedish Institute of Computer Science.
 * Copyright (c) 2003-2004 Leon Woestenberg <leon.woestenberg@axon.tv>
 * Copyright (c) 2003-2004 Axon Digital Design B.V., The Netherlands.
 * 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>
 *
 */

#ifndef __NETIF_ETHARP_H__
#define __NETIF_ETHARP_H__

#include "lwip/opt.h"

#if LWIP_ARP                    /* don't build if not configured for use in lwipopts.h */

#include "lwip/pbuf.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"
#include "lwip/ip.h"
#include <stdbool.h>

#ifdef __cplusplus
extern "C" {
#endif

#ifndef ETH_PAD_SIZE
#define ETH_PAD_SIZE          0
#endif

#ifndef ETHARP_HWADDR_LEN
#define ETHARP_HWADDR_LEN     6
#endif

#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/bpstruct.h"
#endif
    PACK_STRUCT_BEGIN struct eth_addr {
        PACK_STRUCT_FIELD(u8_t addr[ETHARP_HWADDR_LEN]);
    } PACK_STRUCT_STRUCT;
     PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/epstruct.h"
#endif
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/bpstruct.h"
#endif
     PACK_STRUCT_BEGIN struct eth_hdr {
#if ETH_PAD_SIZE
        PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]);
#endif
        PACK_STRUCT_FIELD(struct eth_addr dest);
         PACK_STRUCT_FIELD(struct eth_addr src);
         PACK_STRUCT_FIELD(u16_t type);
    } PACK_STRUCT_STRUCT;
     PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/epstruct.h"
#endif
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/bpstruct.h"
#endif
     PACK_STRUCT_BEGIN
/** the ARP message */
      struct etharp_hdr {
        PACK_STRUCT_FIELD(struct eth_hdr ethhdr);
         PACK_STRUCT_FIELD(u16_t hwtype);
         PACK_STRUCT_FIELD(u16_t proto);
         PACK_STRUCT_FIELD(u16_t _hwlen_protolen);
         PACK_STRUCT_FIELD(u16_t opcode);
         PACK_STRUCT_FIELD(struct eth_addr shwaddr);
         PACK_STRUCT_FIELD(struct ip_addr2 sipaddr);
         PACK_STRUCT_FIELD(struct eth_addr dhwaddr);
         PACK_STRUCT_FIELD(struct ip_addr2 dipaddr);
    } PACK_STRUCT_STRUCT;
     PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/epstruct.h"
#endif
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/bpstruct.h"
#endif
     PACK_STRUCT_BEGIN struct ethip_hdr {
        PACK_STRUCT_FIELD(struct eth_hdr eth);
         PACK_STRUCT_FIELD(struct ip_hdr ip);
    } PACK_STRUCT_STRUCT;
     PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#include "arch/epstruct.h"
#endif
/** 5 seconds period */
#define ARP_TMR_INTERVAL 5000
#define ETHTYPE_ARP       0x0806
#define ETHTYPE_IP        0x0800
#define ETHTYPE_PPPOEDISC 0x8863        /* PPP Over Ethernet Discovery Stage */
#define ETHTYPE_PPPOE     0x8864        /* PPP Over Ethernet Session Stage */
/** ARP message types (opcodes) */
#define ARP_REQUEST 1
#define ARP_REPLY   2
#if ARP_QUEUEING
/** struct for queueing outgoing packets for unknown address
  * defined here to be accessed by memp.h
  */
      struct etharp_q_entry {
        struct etharp_q_entry *next;
        struct pbuf *p;
    };
#endif                          /* ARP_QUEUEING */

#define etharp_init()           /* Compatibility define, not init needed. */
    void etharp_tmr(void);
    s8_t etharp_find_addr(struct netif *netif, struct ip_addr *ipaddr,
                          struct eth_addr **eth_ret, struct ip_addr **ip_ret);
    void etharp_ip_input(struct netif *netif, struct pbuf *p);
    void etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr,
                          struct pbuf *p);
    err_t etharp_output(struct netif *netif, struct pbuf *q,
                        struct ip_addr *ipaddr);
    err_t etharp_query(struct netif *netif, struct ip_addr *ipaddr,
                       struct pbuf *q);


    struct eth_addr convert_uint64_to_eth_addr(uint64_t given_mac);
    bool is_ip_present_in_arp_cache(struct ip_addr *ipaddr);
    uint64_t find_ip_arp_cache(struct ip_addr *ipaddr);



    err_t etharp_request(struct netif *netif, struct ip_addr *ipaddr);
/** For Ethernet network interfaces, we might want to send "gratuitous ARP";
 *  this is an ARP packet sent by a node in order to spontaneously cause other
 *  nodes to update an entry in their ARP cache.
 *  From RFC 3220 "IP Mobility Support for IPv4" section 4.6. */
#define etharp_gratuitous(netif) etharp_request((netif), &(netif)->ip_addr)

    err_t ethernet_input(struct pbuf *p, struct netif *netif);

#if LWIP_AUTOIP
    err_t etharp_raw(struct netif *netif, const struct eth_addr *ethsrc_addr,
                     const struct eth_addr *ethdst_addr,
                     const struct eth_addr *hwsrc_addr,
                     const struct ip_addr *ipsrc_addr,
                     const struct eth_addr *hwdst_addr,
                     const struct ip_addr *ipdst_addr, const u16_t opcode);
#endif                          /* LWIP_AUTOIP */

#define eth_addr_cmp(addr1, addr2) (memcmp((addr1)->addr, (addr2)->addr, ETHARP_HWADDR_LEN) == 0)

    extern const struct eth_addr ethbroadcast, ethzero;

#ifdef __cplusplus
}
#endif
#endif                          /* LWIP_ARP */
#endif                          /* __NETIF_ARP_H__ */
