ReactOS  0.4.15-dev-309-g7c8d563
udp.h
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1 /*
2  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without modification,
6  * are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  * this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright notice,
11  * this list of conditions and the following disclaimer in the documentation
12  * and/or other materials provided with the distribution.
13  * 3. The name of the author may not be used to endorse or promote products
14  * derived from this software without specific prior written permission.
15  *
16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
17  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
18  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
21  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
24  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
25  * OF SUCH DAMAGE.
26  *
27  * This file is part of the lwIP TCP/IP stack.
28  *
29  * Author: Adam Dunkels <adam@sics.se>
30  *
31  */
32 #ifndef __LWIP_UDP_H__
33 #define __LWIP_UDP_H__
34 
35 #include "lwip/opt.h"
36 
37 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
38 
39 #include "lwip/pbuf.h"
40 #include "lwip/netif.h"
41 #include "lwip/ip_addr.h"
42 #include "lwip/ip.h"
43 
44 #ifdef __cplusplus
45 extern "C" {
46 #endif
47 
48 #define UDP_HLEN 8
49 
50 /* Fields are (of course) in network byte order. */
51 #ifdef PACK_STRUCT_USE_INCLUDES
52 # include "arch/bpstruct.h"
53 #endif
55 struct udp_hdr {
57  PACK_STRUCT_FIELD(u16_t dest); /* src/dest UDP ports */
62 #ifdef PACK_STRUCT_USE_INCLUDES
63 # include "arch/epstruct.h"
64 #endif
65 
66 #define UDP_FLAGS_NOCHKSUM 0x01U
67 #define UDP_FLAGS_UDPLITE 0x02U
68 #define UDP_FLAGS_CONNECTED 0x04U
69 #define UDP_FLAGS_MULTICAST_LOOP 0x08U
70 
71 struct udp_pcb;
72 
87 typedef void (*udp_recv_fn)(void *arg, struct udp_pcb *pcb, struct pbuf *p,
89 
90 
91 struct udp_pcb {
92 /* Common members of all PCB types */
93  IP_PCB;
94 
95 /* Protocol specific PCB members */
96 
97  struct udp_pcb *next;
98 
99  u8_t flags;
101  u16_t local_port, remote_port;
102 
103 #if LWIP_IGMP
104 
105  ip_addr_t multicast_ip;
106 #endif /* LWIP_IGMP */
107 
108 #if LWIP_UDPLITE
109 
110  u16_t chksum_len_rx, chksum_len_tx;
111 #endif /* LWIP_UDPLITE */
112 
114  udp_recv_fn recv;
116  void *recv_arg;
117 };
118 /* udp_pcbs export for exernal reference (e.g. SNMP agent) */
119 extern struct udp_pcb *udp_pcbs;
120 
121 /* The following functions is the application layer interface to the
122  UDP code. */
123 struct udp_pcb * udp_new (void);
124 void udp_remove (struct udp_pcb *pcb);
125 err_t udp_bind (struct udp_pcb *pcb, ip_addr_t *ipaddr,
126  u16_t port);
127 err_t udp_connect (struct udp_pcb *pcb, ip_addr_t *ipaddr,
128  u16_t port);
129 void udp_disconnect (struct udp_pcb *pcb);
130 void udp_recv (struct udp_pcb *pcb, udp_recv_fn recv,
131  void *recv_arg);
132 err_t udp_sendto_if (struct udp_pcb *pcb, struct pbuf *p,
133  ip_addr_t *dst_ip, u16_t dst_port,
134  struct netif *netif);
135 err_t udp_sendto (struct udp_pcb *pcb, struct pbuf *p,
136  ip_addr_t *dst_ip, u16_t dst_port);
137 err_t udp_send (struct udp_pcb *pcb, struct pbuf *p);
138 
139 #if LWIP_CHECKSUM_ON_COPY
140 err_t udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p,
141  ip_addr_t *dst_ip, u16_t dst_port,
142  struct netif *netif, u8_t have_chksum,
143  u16_t chksum);
144 err_t udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p,
145  ip_addr_t *dst_ip, u16_t dst_port,
146  u8_t have_chksum, u16_t chksum);
147 err_t udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
148  u8_t have_chksum, u16_t chksum);
149 #endif /* LWIP_CHECKSUM_ON_COPY */
150 
151 #define udp_flags(pcb) ((pcb)->flags)
152 #define udp_setflags(pcb, f) ((pcb)->flags = (f))
153 
154 /* The following functions are the lower layer interface to UDP. */
155 void udp_input (struct pbuf *p, struct netif *inp);
156 
157 void udp_init (void);
158 
159 #if UDP_DEBUG
160 void udp_debug_print(struct udp_hdr *udphdr);
161 #else
162 #define udp_debug_print(udphdr)
163 #endif
164 
165 #ifdef __cplusplus
166 }
167 #endif
168 
169 #endif /* LWIP_UDP */
170 
171 #endif /* __LWIP_UDP_H__ */
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