/*
 * 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>
 *
 */
#ifndef LWIP_HDR_IP4_H
#define LWIP_HDR_IP4_H

#include "lwip/opt.h"

#if LWIP_IPV4

#include "lwip/def.h"
#include "lwip/pbuf.h"
#include "lwip/ip4_addr.h"
#include "lwip/err.h"
#include "lwip/netif.h"

#ifdef __cplusplus
extern "C" {
#endif

#ifdef LWIP_HOOK_IP4_ROUTE_SRC
#define LWIP_IPV4_SRC_ROUTING   1
#else
#define LWIP_IPV4_SRC_ROUTING   0
#endif

/** Currently, the function ip_output_if_opt() is only used with IGMP */
#define IP_OPTIONS_SEND   (LWIP_IPV4 && LWIP_IGMP)

#define IP_HLEN 20


#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/bpstruct.h"
#endif
PACK_STRUCT_BEGIN
struct ip_hdr {
  /* version / header length */
  PACK_STRUCT_FLD_8(u8_t _v_hl);
  /* type of service */
  PACK_STRUCT_FLD_8(u8_t _tos);
  /* total length */
  PACK_STRUCT_FIELD(u16_t _len);
  /* identification */
  PACK_STRUCT_FIELD(u16_t _id);
  /* fragment offset field */
  PACK_STRUCT_FIELD(u16_t _offset);
#define IP_RF 0x8000U        /* reserved fragment flag */
#define IP_DF 0x4000U        /* don't fragment flag */
#define IP_MF 0x2000U        /* more fragments flag */
#define IP_OFFMASK 0x1fffU   /* mask for fragmenting bits */
  /* time to live */
  PACK_STRUCT_FLD_8(u8_t _ttl);
  /* protocol*/
  PACK_STRUCT_FLD_8(u8_t _proto);
  /* checksum */
  PACK_STRUCT_FIELD(u16_t _chksum);
  /* source and destination IP addresses */
  PACK_STRUCT_FLD_S(ip4_addr_p_t src);
  PACK_STRUCT_FLD_S(ip4_addr_p_t dest);
} PACK_STRUCT_STRUCT;
PACK_STRUCT_END
#ifdef PACK_STRUCT_USE_INCLUDES
#  include "arch/epstruct.h"
#endif

#define IPH_V(hdr)  ((hdr)->_v_hl >> 4)
#define IPH_HL(hdr) ((hdr)->_v_hl & 0x0f)
#define IPH_TOS(hdr) ((hdr)->_tos)
#define IPH_LEN(hdr) ((hdr)->_len)
#define IPH_ID(hdr) ((hdr)->_id)
#define IPH_OFFSET(hdr) ((hdr)->_offset)
#define IPH_TTL(hdr) ((hdr)->_ttl)
#define IPH_PROTO(hdr) ((hdr)->_proto)
#define IPH_CHKSUM(hdr) ((hdr)->_chksum)

#define IPH_VHL_SET(hdr, v, hl) (hdr)->_v_hl = (u8_t)((((v) << 4) | (hl)))
#define IPH_TOS_SET(hdr, tos) (hdr)->_tos = (tos)
#define IPH_LEN_SET(hdr, len) (hdr)->_len = (len)
#define IPH_ID_SET(hdr, id) (hdr)->_id = (id)
#define IPH_OFFSET_SET(hdr, off) (hdr)->_offset = (off)
#define IPH_TTL_SET(hdr, ttl) (hdr)->_ttl = (u8_t)(ttl)
#define IPH_PROTO_SET(hdr, proto) (hdr)->_proto = (u8_t)(proto)
#define IPH_CHKSUM_SET(hdr, chksum) (hdr)->_chksum = (chksum)

#define ip_init() /* Compatibility define, no init needed. */
struct netif *ip4_route(const ip4_addr_t *dest);
#if LWIP_IPV4_SRC_ROUTING
struct netif *ip4_route_src(const ip4_addr_t *dest, const ip4_addr_t *src);
#else /* LWIP_IPV4_SRC_ROUTING */
#define ip4_route_src(dest, src) ip4_route(dest)
#endif /* LWIP_IPV4_SRC_ROUTING */
err_t ip4_input(struct pbuf *p, struct netif *inp);
err_t ip4_output(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
       u8_t ttl, u8_t tos, u8_t proto);
err_t ip4_output_if(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
       u8_t ttl, u8_t tos, u8_t proto, struct netif *netif);
err_t ip4_output_if_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
       u8_t ttl, u8_t tos, u8_t proto, struct netif *netif);
#if LWIP_NETIF_HWADDRHINT
err_t ip4_output_hinted(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
       u8_t ttl, u8_t tos, u8_t proto, u8_t *addr_hint);
#endif /* LWIP_NETIF_HWADDRHINT */
#if IP_OPTIONS_SEND
err_t ip4_output_if_opt(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
       u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
       u16_t optlen);
err_t ip4_output_if_opt_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
       u8_t ttl, u8_t tos, u8_t proto, struct netif *netif, void *ip_options,
       u16_t optlen);
#endif /* IP_OPTIONS_SEND */

#if LWIP_MULTICAST_TX_OPTIONS
void  ip4_set_default_multicast_netif(struct netif* default_multicast_netif);
#endif /* LWIP_MULTICAST_TX_OPTIONS */

#define ip4_netif_get_local_ip(netif) (((netif) != NULL) ? netif_ip_addr4(netif) : NULL)

#if IP_DEBUG
void ip4_debug_print(struct pbuf *p);
#else
#define ip4_debug_print(p)
#endif /* IP_DEBUG */

#ifdef __cplusplus
}
#endif

#endif /* LWIP_IPV4 */

#endif /* LWIP_HDR_IP_H */


