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udp.h
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1 /**
2  * @file
3  * UDP API (to be used from TCPIP thread)\n
4  * See also @ref udp_raw
5  */
6 
7 /*
8  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
9  * All rights reserved.
10  *
11  * Redistribution and use in source and binary forms, with or without modification,
12  * are permitted provided that the following conditions are met:
13  *
14  * 1. Redistributions of source code must retain the above copyright notice,
15  * this list of conditions and the following disclaimer.
16  * 2. Redistributions in binary form must reproduce the above copyright notice,
17  * this list of conditions and the following disclaimer in the documentation
18  * and/or other materials provided with the distribution.
19  * 3. The name of the author may not be used to endorse or promote products
20  * derived from this software without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
23  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
24  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
25  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
26  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
27  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
30  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
31  * OF SUCH DAMAGE.
32  *
33  * This file is part of the lwIP TCP/IP stack.
34  *
35  * Author: Adam Dunkels <adam@sics.se>
36  *
37  */
38 #ifndef LWIP_HDR_UDP_H
39 #define LWIP_HDR_UDP_H
40 
41 #include "lwip/opt.h"
42 
43 #if LWIP_UDP /* don't build if not configured for use in lwipopts.h */
44 
45 #include "lwip/pbuf.h"
46 #include "lwip/netif.h"
47 #include "lwip/ip_addr.h"
48 #include "lwip/ip.h"
49 #include "lwip/ip6_addr.h"
50 #include "lwip/prot/udp.h"
51 
52 #ifdef __cplusplus
53 extern "C" {
54 #endif
55 
56 #define UDP_FLAGS_NOCHKSUM 0x01U
57 #define UDP_FLAGS_UDPLITE 0x02U
58 #define UDP_FLAGS_CONNECTED 0x04U
59 #define UDP_FLAGS_MULTICAST_LOOP 0x08U
60 
61 struct udp_pcb;
62 
63 /** Function prototype for udp pcb receive callback functions
64  * addr and port are in same byte order as in the pcb
65  * The callback is responsible for freeing the pbuf
66  * if it's not used any more.
67  *
68  * ATTENTION: Be aware that 'addr' might point into the pbuf 'p' so freeing this pbuf
69  * can make 'addr' invalid, too.
70  *
71  * @param arg user supplied argument (udp_pcb.recv_arg)
72  * @param pcb the udp_pcb which received data
73  * @param p the packet buffer that was received
74  * @param addr the remote IP address from which the packet was received
75  * @param port the remote port from which the packet was received
76  */
77 typedef void (*udp_recv_fn)(void *arg, struct udp_pcb *pcb, struct pbuf *p,
78  const ip_addr_t *addr, u16_t port);
79 
80 /** the UDP protocol control block */
81 struct udp_pcb {
82 /** Common members of all PCB types */
83  IP_PCB;
84 
85 /* Protocol specific PCB members */
86 
87  struct udp_pcb *next;
88 
89  u8_t flags;
90  /** ports are in host byte order */
91  u16_t local_port, remote_port;
92 
93 #if LWIP_MULTICAST_TX_OPTIONS
94 #if LWIP_IPV4
95  /** outgoing network interface for multicast packets, by IPv4 address (if not 'any') */
96  ip4_addr_t mcast_ip4;
97 #endif /* LWIP_IPV4 */
98  /** outgoing network interface for multicast packets, by interface index (if nonzero) */
99  u8_t mcast_ifindex;
100  /** TTL for outgoing multicast packets */
101  u8_t mcast_ttl;
102 #endif /* LWIP_MULTICAST_TX_OPTIONS */
103 
104 #if LWIP_UDPLITE
105  /** used for UDP_LITE only */
106  u16_t chksum_len_rx, chksum_len_tx;
107 #endif /* LWIP_UDPLITE */
108 
109  /** receive callback function */
110  udp_recv_fn recv;
111  /** user-supplied argument for the recv callback */
112  void *recv_arg;
113 };
114 /* udp_pcbs export for external reference (e.g. SNMP agent) */
115 extern struct udp_pcb *udp_pcbs;
116 
117 /* The following functions is the application layer interface to the
118  UDP code. */
119 struct udp_pcb * udp_new (void);
120 struct udp_pcb * udp_new_ip_type(u8_t type);
121 void udp_remove (struct udp_pcb *pcb);
122 err_t udp_bind (struct udp_pcb *pcb, const ip_addr_t *ipaddr,
123  u16_t port);
124 void udp_bind_netif (struct udp_pcb *pcb, const struct netif* netif);
125 err_t udp_connect (struct udp_pcb *pcb, const ip_addr_t *ipaddr,
126  u16_t port);
127 void udp_disconnect (struct udp_pcb *pcb);
128 void udp_recv (struct udp_pcb *pcb, udp_recv_fn recv,
129  void *recv_arg);
130 err_t udp_sendto_if (struct udp_pcb *pcb, struct pbuf *p,
131  const ip_addr_t *dst_ip, u16_t dst_port,
132  struct netif *netif);
133 err_t udp_sendto_if_src(struct udp_pcb *pcb, struct pbuf *p,
134  const ip_addr_t *dst_ip, u16_t dst_port,
135  struct netif *netif, const ip_addr_t *src_ip);
136 err_t udp_sendto (struct udp_pcb *pcb, struct pbuf *p,
137  const ip_addr_t *dst_ip, u16_t dst_port);
138 err_t udp_send (struct udp_pcb *pcb, struct pbuf *p);
139 
140 #if LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_UDP
141 err_t udp_sendto_if_chksum(struct udp_pcb *pcb, struct pbuf *p,
142  const ip_addr_t *dst_ip, u16_t dst_port,
143  struct netif *netif, u8_t have_chksum,
144  u16_t chksum);
145 err_t udp_sendto_chksum(struct udp_pcb *pcb, struct pbuf *p,
146  const ip_addr_t *dst_ip, u16_t dst_port,
147  u8_t have_chksum, u16_t chksum);
148 err_t udp_send_chksum(struct udp_pcb *pcb, struct pbuf *p,
149  u8_t have_chksum, u16_t chksum);
150 err_t udp_sendto_if_src_chksum(struct udp_pcb *pcb, struct pbuf *p,
151  const ip_addr_t *dst_ip, u16_t dst_port, struct netif *netif,
152  u8_t have_chksum, u16_t chksum, const ip_addr_t *src_ip);
153 #endif /* LWIP_CHECKSUM_ON_COPY && CHECKSUM_GEN_UDP */
154 
155 #define udp_flags(pcb) ((pcb)->flags)
156 #define udp_setflags(pcb, f) ((pcb)->flags = (f))
157 
158 #define udp_set_flags(pcb, set_flags) do { (pcb)->flags = (u8_t)((pcb)->flags | (set_flags)); } while(0)
159 #define udp_clear_flags(pcb, clr_flags) do { (pcb)->flags = (u8_t)((pcb)->flags & (u8_t)(~(clr_flags) & 0xff)); } while(0)
160 #define udp_is_flag_set(pcb, flag) (((pcb)->flags & (flag)) != 0)
161 
162 /* The following functions are the lower layer interface to UDP. */
163 void udp_input (struct pbuf *p, struct netif *inp);
164 
165 void udp_init (void);
166 
167 /* for compatibility with older implementation */
168 #define udp_new_ip6() udp_new_ip_type(IPADDR_TYPE_V6)
169 
170 #if LWIP_MULTICAST_TX_OPTIONS
171 #if LWIP_IPV4
172 #define udp_set_multicast_netif_addr(pcb, ip4addr) ip4_addr_copy((pcb)->mcast_ip4, *(ip4addr))
173 #define udp_get_multicast_netif_addr(pcb) (&(pcb)->mcast_ip4)
174 #endif /* LWIP_IPV4 */
175 #define udp_set_multicast_netif_index(pcb, idx) ((pcb)->mcast_ifindex = (idx))
176 #define udp_get_multicast_netif_index(pcb) ((pcb)->mcast_ifindex)
177 #define udp_set_multicast_ttl(pcb, value) ((pcb)->mcast_ttl = (value))
178 #define udp_get_multicast_ttl(pcb) ((pcb)->mcast_ttl)
179 #endif /* LWIP_MULTICAST_TX_OPTIONS */
180 
181 #if UDP_DEBUG
182 void udp_debug_print(struct udp_hdr *udphdr);
183 #else
184 #define udp_debug_print(udphdr)
185 #endif
186 
187 void udp_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_addr);
188 
189 #ifdef __cplusplus
190 }
191 #endif
192 
193 #endif /* LWIP_UDP */
194 
195 #endif /* LWIP_HDR_UDP_H */
udp_hdr
Definition: prot/udp.h:53
ip.h
IP API.
IP_PCB
#define IP_PCB
This is the common part of all PCB types.
Definition: ip.h:76
opt.h
lwIP Options Configuration
ip6_addr.h
IPv6 addresses.
udp.h
UDP protocol definitions.
netif.h
netif API (to be used from TCPIP thread)
pbuf
Main packet buffer struct.
Definition: ppp_service_if.h:136
netif
Generic data structure used for all lwIP network interfaces.
Definition: ppp_service_if.h:157
pbuf.h
pbuf API
nsapi_addr
IP address structure for passing IP addresses by value.
Definition: nsapi_types.h:235
ip_addr.h
IP address API (common IPv4 and IPv6)
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