2 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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3 * All rights reserved.
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5 * Redistribution and use in source and binary forms, with or without modification,
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6 * are permitted provided that the following conditions are met:
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8 * 1. Redistributions of source code must retain the above copyright notice,
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9 * this list of conditions and the following disclaimer.
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10 * 2. Redistributions in binary form must reproduce the above copyright notice,
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11 * this list of conditions and the following disclaimer in the documentation
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12 * and/or other materials provided with the distribution.
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13 * 3. The name of the author may not be used to endorse or promote products
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14 * derived from this software without specific prior written permission.
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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19 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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21 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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22 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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27 * This file is part of the lwIP TCP/IP stack.
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29 * Author: Adam Dunkels <adam@sics.se>
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32 #ifndef __LWIP_UDP_H__
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33 #define __LWIP_UDP_H__
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35 #include "lwip/opt.h"
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37 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
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39 #include "lwip/pbuf.h"
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40 #include "lwip/netif.h"
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41 #include "lwip/ip_addr.h"
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42 #include "lwip/ip.h"
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50 /* Fields are (of course) in network byte order. */
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51 #ifdef PACK_STRUCT_USE_INCLUDES
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52 # include "arch/bpstruct.h"
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56 PACK_STRUCT_FIELD(u16_t src);
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57 PACK_STRUCT_FIELD(u16_t dest); /* src/dest UDP ports */
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58 PACK_STRUCT_FIELD(u16_t len);
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59 PACK_STRUCT_FIELD(u16_t chksum);
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60 } PACK_STRUCT_STRUCT;
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62 #ifdef PACK_STRUCT_USE_INCLUDES
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63 # include "arch/epstruct.h"
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66 #define UDP_FLAGS_NOCHKSUM 0x01U
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67 #define UDP_FLAGS_UDPLITE 0x02U
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68 #define UDP_FLAGS_CONNECTED 0x04U
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71 /* Common members of all PCB types */
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74 /* Protocol specific PCB members */
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76 struct udp_pcb *next;
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79 /* ports are in host byte order */
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80 u16_t local_port, remote_port;
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83 /* outgoing network interface for multicast packets */
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84 struct ip_addr multicast_ip;
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85 #endif /* LWIP_IGMP */
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88 /* used for UDP_LITE only */
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89 u16_t chksum_len_rx, chksum_len_tx;
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90 #endif /* LWIP_UDPLITE */
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92 /* receive callback function
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93 * addr and port are in same byte order as in the pcb
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94 * The callback is responsible for freeing the pbuf
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95 * if it's not used any more.
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97 * @param arg user supplied argument (udp_pcb.recv_arg)
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98 * @param pcb the udp_pcb which received data
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99 * @param p the packet buffer that was received
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100 * @param addr the remote IP address from which the packet was received
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101 * @param port the remote port from which the packet was received
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103 void (* recv)(void *arg, struct udp_pcb *pcb, struct pbuf *p,
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104 struct ip_addr *addr, u16_t port);
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105 /* user-supplied argument for the recv callback */
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108 /* udp_pcbs export for exernal reference (e.g. SNMP agent) */
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109 extern struct udp_pcb *udp_pcbs;
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111 /* The following functions is the application layer interface to the
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113 struct udp_pcb * udp_new (void);
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114 void udp_remove (struct udp_pcb *pcb);
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115 err_t udp_bind (struct udp_pcb *pcb, struct ip_addr *ipaddr,
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117 err_t udp_connect (struct udp_pcb *pcb, struct ip_addr *ipaddr,
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119 void udp_disconnect (struct udp_pcb *pcb);
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120 void udp_recv (struct udp_pcb *pcb,
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121 void (* recv)(void *arg, struct udp_pcb *upcb,
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123 struct ip_addr *addr,
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126 err_t udp_sendto_if (struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *dst_ip, u16_t dst_port, struct netif *netif);
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127 err_t udp_sendto (struct udp_pcb *pcb, struct pbuf *p, struct ip_addr *dst_ip, u16_t dst_port);
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128 err_t udp_send (struct udp_pcb *pcb, struct pbuf *p);
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130 #define udp_flags(pcb) ((pcb)->flags)
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131 #define udp_setflags(pcb, f) ((pcb)->flags = (f))
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133 /* The following functions are the lower layer interface to UDP. */
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134 void udp_input (struct pbuf *p, struct netif *inp);
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136 #define udp_init() /* Compatibility define, not init needed. */
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139 void udp_debug_print(struct udp_hdr *udphdr);
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141 #define udp_debug_print(udphdr)
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148 #endif /* LWIP_UDP */
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150 #endif /* __LWIP_UDP_H__ */
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