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/*

 * 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_UDP_H__

#define __LWIP_UDP_H__

#include "lwip/arch.h"

#include "lwip/pbuf.h"

#include "lwip/inet.h"

#include "lwip/ip.h"

#define UDP_HLEN 8

struct udp_hdr {

  PACK_STRUCT_FIELD(u16_t src);

  PACK_STRUCT_FIELD(u16_t dest);  /* src/dest UDP ports */

  PACK_STRUCT_FIELD(u16_t len);

  PACK_STRUCT_FIELD(u16_t chksum);

} PACK_STRUCT_STRUCT;

#define UDP_FLAGS_NOCHKSUM 0x01U

#define UDP_FLAGS_UDPLITE  0x02U

#define UDP_FLAGS_CONNECTED  0x04U

struct udp_pcb {

/* Common members of all PCB types */

  IP_PCB;

/* Protocol specific PCB members */

  struct udp_pcb *next;

  u8_t flags;

  u16_t local_port, remote_port;

  u16_t chksum_len;

  void (* recv)(void *arg, struct udp_pcb *pcb, struct pbuf *p,

    struct ip_addr *addr, u16_t port);

  void *recv_arg;

};

/* The following functions is the application layer interface to the

   UDP code. */

struct udp_pcb * udp_new        (void);

void             udp_remove     (struct udp_pcb *pcb);

err_t            udp_bind       (struct udp_pcb *pcb, struct ip_addr *ipaddr,

                 u16_t port);

err_t            udp_connect    (struct udp_pcb *pcb, struct ip_addr *ipaddr,

                 u16_t port);

void             udp_disconnect    (struct udp_pcb *pcb);

void             udp_recv       (struct udp_pcb *pcb,

         void (* recv)(void *arg, struct udp_pcb *upcb,

                 struct pbuf *p,

                 struct ip_addr *addr,

                 u16_t port),

         void *recv_arg);

err_t            udp_sendto     (struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *dst_ip, u16_t dst_port);

err_t            udp_send       (struct udp_pcb *pcb, struct pbuf *p);

#define          udp_flags(pcb)  ((pcb)->flags)

#define          udp_setflags(pcb, f)  ((pcb)->flags = (f))

/* The following functions are the lower layer interface to UDP. */

void             udp_input      (struct pbuf *p, struct netif *inp);

void             udp_init       (void);

#if UDP_DEBUG

void udp_debug_print(struct udp_hdr *udphdr);

#else

#define udp_debug_print(udphdr)

#endif

#endif /* __LWIP_UDP_H__ */