udp.h

lwIP is a small independent implementation of the TCP/IP protocol suite that has been developed by

/*
 * Copyright (c) 2001-2003 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 <[e-mail]>
 *
 */
#ifndef __LWIP_UDP_H__
#define __LWIP_UDP_H__

#include "lwip/arch.h"

#include "lwip/pbuf.h"
#include "lwip/inet.h"
#include "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 0x01U
#define UDP_FLAGS_UDPLITE  0x02U
#define UDP_FLAGS_CONNECTED  0x04U

struct udp_pcb {
  struct udp_pcb *next;

  struct 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,
		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_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. */
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__ */