[164] | 1 | /*
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| 2 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
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| 3 | * All rights reserved.
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| 4 | *
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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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| 7 | *
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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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| 15 | *
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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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| 25 | * OF SUCH DAMAGE.
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| 26 | *
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| 27 | * This file is part of the lwIP TCP/IP stack.
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| 28 | *
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| 29 | * Author: Adam Dunkels <adam@sics.se>
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| 30 | *
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| 31 | */
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| 32 | #ifndef __LWIP_UDP_H__
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| 33 | #define __LWIP_UDP_H__
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| 34 |
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| 35 | #include "lwip/opt.h"
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| 36 |
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| 37 | #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
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| 38 |
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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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| 43 |
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| 44 | #ifdef __cplusplus
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| 45 | extern "C" {
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| 46 | #endif
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| 47 |
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| 48 | #define UDP_HLEN 8
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| 49 |
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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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| 53 | #endif
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| 54 | PACK_STRUCT_BEGIN
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| 55 | struct udp_hdr {
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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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| 61 | PACK_STRUCT_END
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| 62 | #ifdef PACK_STRUCT_USE_INCLUDES
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| 63 | # include "arch/epstruct.h"
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| 64 | #endif
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| 65 |
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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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| 69 | #define UDP_FLAGS_MULTICAST_LOOP 0x08U
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| 70 |
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| 71 | struct udp_pcb;
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| 72 |
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| 73 | /** Function prototype for udp pcb receive callback functions
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| 74 | * addr and port are in same byte order as in the pcb
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| 75 | * The callback is responsible for freeing the pbuf
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| 76 | * if it's not used any more.
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| 77 | *
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| 78 | * ATTENTION: Be aware that 'addr' points into the pbuf 'p' so freeing this pbuf
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| 79 | * makes 'addr' invalid, too.
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| 80 | *
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| 81 | * @param arg user supplied argument (udp_pcb.recv_arg)
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| 82 | * @param pcb the udp_pcb which received data
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| 83 | * @param p the packet buffer that was received
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| 84 | * @param addr the remote IP address from which the packet was received
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| 85 | * @param port the remote port from which the packet was received
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| 86 | */
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| 87 | typedef void (*udp_recv_fn)(void *arg, struct udp_pcb *pcb, struct pbuf *p,
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| 88 | ip_addr_t *addr, u16_t port);
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| 89 |
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| 90 |
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| 91 | struct udp_pcb {
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| 92 | /* Common members of all PCB types */
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| 93 | IP_PCB;
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| 94 |
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| 95 | /* Protocol specific PCB members */
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| 96 |
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| 97 | struct udp_pcb *next;
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| 98 |
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| 99 | u8_t flags;
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| 100 | /** ports are in host byte order */
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| 101 | u16_t local_port, remote_port;
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| 102 |
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| 103 | #if LWIP_IGMP
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| 104 | /** outgoing network interface for multicast packets */
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| 105 | ip_addr_t multicast_ip;
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| 106 | #endif /* LWIP_IGMP */
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| 107 |
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| 108 | #if LWIP_UDPLITE
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| 109 | /** used for UDP_LITE only */
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| 110 | u16_t chksum_len_rx, chksum_len_tx;
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| 111 | #endif /* LWIP_UDPLITE */
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| 112 |
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| 113 | /** receive callback function */
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| 114 | udp_recv_fn recv;
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| 115 | /** user-supplied argument for the recv callback */
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| 116 | void *recv_arg;
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| 117 | };
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| 118 | /* udp_pcbs export for exernal reference (e.g. SNMP agent) */
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| 119 | extern struct udp_pcb *udp_pcbs;
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| 120 |
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| 121 | /* The following functions is the application layer interface to the
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| 122 | UDP code. */
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| 123 | struct udp_pcb * udp_new (void);
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| 124 | void udp_remove (struct udp_pcb *pcb);
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| 125 | err_t udp_bind (struct udp_pcb *pcb, ip_addr_t *ipaddr,
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| 126 | u16_t port);
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| 127 | err_t udp_connect (struct udp_pcb *pcb, ip_addr_t *ipaddr,
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| 128 | u16_t port);
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| 129 | void udp_disconnect (struct udp_pcb *pcb);
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| 130 | void udp_recv (struct udp_pcb *pcb, udp_recv_fn recv,
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| 131 | void *recv_arg);
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| 132 | err_t udp_sendto_if (struct udp_pcb *pcb, struct pbuf *p,
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| 133 | ip_addr_t *dst_ip, u16_t dst_port,
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| 134 | struct netif *netif);
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| 135 | err_t udp_sendto (struct udp_pcb *pcb, struct pbuf *p,
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| 136 | ip_addr_t *dst_ip, u16_t dst_port);
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| 137 | err_t udp_send (struct udp_pcb *pcb, struct pbuf *p);
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| 138 |
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| 139 | #if LWIP_CHECKSUM_ON_COPY
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| 140 | err_t udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p,
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| 141 | ip_addr_t *dst_ip, u16_t dst_port,
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| 142 | struct netif *netif, u8_t have_chksum,
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| 143 | u16_t chksum);
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| 144 | err_t udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p,
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| 145 | ip_addr_t *dst_ip, u16_t dst_port,
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| 146 | u8_t have_chksum, u16_t chksum);
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| 147 | err_t udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
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| 148 | u8_t have_chksum, u16_t chksum);
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| 149 | #endif /* LWIP_CHECKSUM_ON_COPY */
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| 150 |
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| 151 | #define udp_flags(pcb) ((pcb)->flags)
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| 152 | #define udp_setflags(pcb, f) ((pcb)->flags = (f))
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| 153 |
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| 154 | /* The following functions are the lower layer interface to UDP. */
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| 155 | void udp_input (struct pbuf *p, struct netif *inp);
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| 156 |
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| 157 | void udp_init (void);
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| 158 |
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| 159 | #if UDP_DEBUG
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| 160 | void udp_debug_print(struct udp_hdr *udphdr);
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| 161 | #else
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| 162 | #define udp_debug_print(udphdr)
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| 163 | #endif
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| 164 |
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| 165 | #ifdef __cplusplus
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| 166 | }
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| 167 | #endif
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| 168 |
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| 169 | #endif /* LWIP_UDP */
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| 170 |
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| 171 | #endif /* __LWIP_UDP_H__ */
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