--- /dev/null
+/*
+ * 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/opt.h"
+
+#if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
+
+#include "lwip/pbuf.h"
+#include "lwip/netif.h"
+#include "lwip/ip_addr.h"
+#include "lwip/ip.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define UDP_HLEN 8
+
+/* Fields are (of course) in network byte order. */
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/bpstruct.h"
+#endif
+PACK_STRUCT_BEGIN
+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;
+PACK_STRUCT_END
+#ifdef PACK_STRUCT_USE_INCLUDES
+# include "arch/epstruct.h"
+#endif
+
+#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;
+ /* ports are in host byte order */
+ u16_t local_port, remote_port;
+
+#if LWIP_IGMP
+ /* outgoing network interface for multicast packets */
+ struct ip_addr multicast_ip;
+#endif /* LWIP_IGMP */
+
+#if LWIP_UDPLITE
+ /* used for UDP_LITE only */
+ u16_t chksum_len_rx, chksum_len_tx;
+#endif /* LWIP_UDPLITE */
+
+ /* receive callback function
+ * addr and port are in same byte order as in the pcb
+ * The callback is responsible for freeing the pbuf
+ * if it's not used any more.
+ *
+ * @param arg user supplied argument (udp_pcb.recv_arg)
+ * @param pcb the udp_pcb which received data
+ * @param p the packet buffer that was received
+ * @param addr the remote IP address from which the packet was received
+ * @param port the remote port from which the packet was received
+ */
+ void (* recv)(void *arg, struct udp_pcb *pcb, struct pbuf *p,
+ struct ip_addr *addr, u16_t port);
+ /* user-supplied argument for the recv callback */
+ void *recv_arg;
+};
+/* udp_pcbs export for exernal reference (e.g. SNMP agent) */
+extern struct udp_pcb *udp_pcbs;
+
+/* 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_if (struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *dst_ip, u16_t dst_port, struct netif *netif);
+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);
+
+#define udp_init() /* Compatibility define, not init needed. */
+
+#if UDP_DEBUG
+void udp_debug_print(struct udp_hdr *udphdr);
+#else
+#define udp_debug_print(udphdr)
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* LWIP_UDP */
+
+#endif /* __LWIP_UDP_H__ */
