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17 * @file transport/plugin_transport_udp.h
18 * @brief Implementation of the UDP transport protocol
19 * @author Christian Grothoff
20 * @author Nathan Evans
21 * @author Matthias Wachs
23 #ifndef PLUGIN_TRANSPORT_UDP_H
24 #define PLUGIN_TRANSPORT_UDP_H
27 #include "gnunet_hello_lib.h"
28 #include "gnunet_util_lib.h"
29 #include "gnunet_fragmentation_lib.h"
30 #include "gnunet_protocols.h"
31 #include "gnunet_resolver_service.h"
32 #include "gnunet_signatures.h"
33 #include "gnunet_constants.h"
34 #include "gnunet_statistics_service.h"
35 #include "gnunet_transport_service.h"
36 #include "gnunet_transport_plugin.h"
37 #include "transport.h"
39 #define LOG(kind,...) GNUNET_log_from (kind, "transport-udp", __VA_ARGS__)
41 #define PLUGIN_NAME "udp"
43 #define DEBUG_UDP GNUNET_NO
45 #define DEBUG_UDP_BROADCASTING GNUNET_NO
48 * MTU for fragmentation subsystem. Should be conservative since
49 * all communicating peers MUST work with this MTU.
54 GNUNET_NETWORK_STRUCT_BEGIN
56 * Network format for IPv4 addresses.
61 * Optional options and flags for this address
63 uint32_t options GNUNET_PACKED;
66 * IPv4 address, in network byte order.
68 uint32_t ipv4_addr GNUNET_PACKED;
71 * Port number, in network byte order.
73 uint16_t u4_port GNUNET_PACKED;
78 * Network format for IPv6 addresses.
83 * Optional options and flags for this address
85 uint32_t options GNUNET_PACKED;
90 struct in6_addr ipv6_addr GNUNET_PACKED;
93 * Port number, in network byte order.
95 uint16_t u6_port GNUNET_PACKED;
97 GNUNET_NETWORK_STRUCT_END
100 * Either an IPv4 or IPv6 UDP address. Note that without a "length",
101 * one cannot tell which one of the two types this address represents.
108 struct IPv4UdpAddress v4;
113 struct IPv6UdpAddress v6;
118 * Information we track for each message in the queue.
120 struct UDP_MessageWrapper;
124 * Closure for #append_port().
126 struct PrettyPrinterContext;
130 * Encapsulation of all of the state of the plugin.
138 struct GNUNET_TRANSPORT_PluginEnvironment *env;
141 * Session of peers with whom we are currently connected,
142 * map of peer identity to `struct GNUNET_ATS_Session *`.
144 struct GNUNET_CONTAINER_MultiPeerMap *sessions;
147 * Heap with all of our defragmentation activities.
149 struct GNUNET_CONTAINER_Heap *defrag_ctxs;
152 * ID of select task for IPv4
154 struct GNUNET_SCHEDULER_Task *select_task_v4;
157 * ID of select task for IPv6
159 struct GNUNET_SCHEDULER_Task *select_task_v6;
162 * Bandwidth tracker to limit global UDP traffic.
164 struct GNUNET_BANDWIDTH_Tracker tracker;
167 * Address we were told to bind to exclusively (IPv4).
172 * Address we were told to bind to exclusively (IPv6).
177 * Handle to NAT traversal support.
179 struct GNUNET_NAT_Handle *nat;
182 * Handle to NAT traversal support.
184 struct GNUNET_NAT_STUN_Handle *stun;
187 * The read socket for IPv4
189 struct GNUNET_NETWORK_Handle *sockv4;
192 * The read socket for IPv6
194 struct GNUNET_NETWORK_Handle *sockv6;
197 * Head of DLL of broadcast addresses
199 struct BroadcastAddress *broadcast_tail;
202 * Tail of DLL of broadcast addresses
204 struct BroadcastAddress *broadcast_head;
207 * Head of messages in IPv4 queue.
209 struct UDP_MessageWrapper *ipv4_queue_head;
212 * Tail of messages in IPv4 queue.
214 struct UDP_MessageWrapper *ipv4_queue_tail;
217 * Head of messages in IPv6 queue.
219 struct UDP_MessageWrapper *ipv6_queue_head;
222 * Tail of messages in IPv6 queue.
224 struct UDP_MessageWrapper *ipv6_queue_tail;
227 * Running pretty printers: head
229 struct PrettyPrinterContext *ppc_dll_head;
232 * Running pretty printers: tail
234 struct PrettyPrinterContext *ppc_dll_tail;
237 * Function to call about session status changes.
239 GNUNET_TRANSPORT_SessionInfoCallback sic;
242 * Closure for @e sic.
247 * IPv6 multicast address
249 struct sockaddr_in6 ipv6_multicast_address;
254 struct GNUNET_TIME_Relative broadcast_interval;
257 * Bytes currently in buffer
259 int64_t bytes_in_buffer;
267 * Is IPv6 enabled: #GNUNET_YES or #GNUNET_NO
272 * Is IPv4 enabled: #GNUNET_YES or #GNUNET_NO
277 * Is broadcasting enabled: #GNUNET_YES or #GNUNET_NO
279 int enable_broadcasting;
282 * Is receiving broadcasts enabled: #GNUNET_YES or #GNUNET_NO
284 int enable_broadcasting_receiving;
287 * Port we broadcasting on.
289 uint16_t broadcast_port;
297 * Port we advertise on.
305 * Function called for a quick conversion of the binary address to
306 * a numeric address. Note that the caller must not free the
307 * address and that the next call to this function is allowed
308 * to override the address again.
311 * @param addr binary address (a `union UdpAddress`)
312 * @param addrlen length of the @a addr
313 * @return string representing the same address
316 udp_address_to_string (void *cls,
322 * We received a broadcast message. Process it and all subsequent
323 * messages in the same packet.
325 * @param plugin the UDP plugin
326 * @param buf the buffer with the message(s)
327 * @param size number of bytes in @a buf
328 * @param udp_addr address of the sender
329 * @param udp_addr_len number of bytes in @a udp_addr
330 * @param network_type network type of the sender's address
333 udp_broadcast_receive (struct Plugin *plugin,
336 const union UdpAddress *udp_addr,
338 enum GNUNET_ATS_Network_Type network_type);
342 setup_broadcast (struct Plugin *plugin,
343 struct sockaddr_in6 *server_addrv6,
344 struct sockaddr_in *server_addrv4);
348 stop_broadcast (struct Plugin *plugin);
350 /*#ifndef PLUGIN_TRANSPORT_UDP_H*/
352 /* end of plugin_transport_udp.h */