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/* 
 * Copyright (c) 2001, 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. Neither the name of the Institute nor the names of its contributors  
 *    may be used to endorse or promote products derived from this software  
 *    without specific prior written permission.  
 * 
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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> 
 * 
 * $Id: udp.h,v 1.4 2002/03/04 10:47:56 adam Exp $ 
 */ 
#ifndef __LWIP_UDP_H__ 
#define __LWIP_UDP_H__ 
 
#include "lwip/arch.h" 
 
#include "lwip/pbuf.h" 
#include "ipv4/lwip/inet.h" 
#include "ipv4/lwip/ip.h" 
 
#include "lwip/err.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 0x01 
#define UDP_FLAGS_UDPLITE  0x02 
 
struct udp_pcb { 
  struct udp_pcb *next; 
 
  union ip_addr local_ip, remote_ip; 
  u16_t local_port, remote_port; 
   
  u8_t flags; 
  u16_t chksum_len; 
   
  void (* recv)(void *arg, struct udp_pcb *pcb, struct pbuf *p, 
		union 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, union ip_addr *ipaddr, 
				 u16_t port); 
err_t            udp_connect    (struct udp_pcb *pcb, union ip_addr *ipaddr, 
				 u16_t port); 
void             udp_recv       (struct udp_pcb *pcb, 
				 void (* recv)(void *arg, struct udp_pcb *upcb, 
					       struct pbuf *p, 
					       union ip_addr *addr, 
					       u16_t port), 
				 void *recv_arg); 
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 is the lower layer interface to UDP. */ 
u8_t             udp_lookup     (struct ip_hdr *iphdr, struct netif *inp); 
void             udp_input      (struct pbuf *p, struct netif *inp); 
void             udp_init       (void); 
 
 
#endif /* __LWIP_UDP_H__ */