2 This file is part of GNUnet.
3 (C) 2011 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 * @file dht/gnunet-service-xdht_routing.c
23 * @brief GNUnet DHT tracking of requests for routing replies
24 * @author Supriti Singh
27 #include "gnunet-service-xdht_neighbours.h"
28 #include "gnunet-service-xdht_routing.h"
29 #include "gnunet-service-xdht.h"
32 * 1. We need field to understand which routing table is for which peer.
33 * 2. Better function names and variable names.
34 * 3. Use destination peer id as key for routing table.
35 * 4. What does GDS stands for?
41 * Number of requests we track at most (for routing replies).
43 #define DHT_MAX_RECENT (1024 * 16)
47 * Routing table entry .
54 struct GNUNET_PeerIdentity *source;
59 struct GNUNET_PeerIdentity *destination;
62 * The peer this request was received from.
64 struct GNUNET_PeerIdentity *previous_hop;
67 * The peer to which this request should be passed to.
69 struct GNUNET_PeerIdentity *next_hop;
75 * Routing table of the peer
77 static struct GNUNET_CONTAINER_MultiPeerMap *routing_table;
81 * FIXME: Change the name of variable.
82 * Ensure that everywhere in this file you are using destination as the key.
83 * Do we need prev field in routing table?
84 * Add a new entry to our routing table.
90 GDS_ROUTING_add (struct GNUNET_PeerIdentity *source,
91 struct GNUNET_PeerIdentity *dest,
92 struct GNUNET_PeerIdentity *next_hop)
94 struct RoutingTrail *new_routing_entry;
96 new_routing_entry = GNUNET_malloc (sizeof (struct RoutingTrail));
97 new_routing_entry->source = source;
98 new_routing_entry->next_hop = next_hop;
99 new_routing_entry->destination = dest;
101 /* If dest is already present in the routing table, then exit.*/
103 GNUNET_CONTAINER_multipeermap_contains (routing_table,
110 GNUNET_assert (GNUNET_OK ==
111 GNUNET_CONTAINER_multipeermap_put (routing_table,
112 dest, new_routing_entry,
113 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_ONLY));
118 * Find the next hop to send packet to .
119 * @return next hop peer id
121 struct GNUNET_PeerIdentity *
122 GDS_ROUTING_search(struct GNUNET_PeerIdentity *source_peer,
123 struct GNUNET_PeerIdentity *destination_peer)
125 struct RoutingTrail *trail;
126 trail = (struct RoutingTrail *)(GNUNET_CONTAINER_multipeermap_get(routing_table,destination_peer));
131 return trail->next_hop;
135 /**FIXME: Old implementation just to remove error
136 * Handle a reply (route to origin). Only forwards the reply back to
137 * other peers waiting for it. Does not do local caching or
138 * forwarding to local clients. Essentially calls
139 * GDS_NEIGHBOURS_handle_reply for all peers that sent us a matching
142 * @param type type of the block
143 * @param expiration_time when does the content expire
144 * @param key key for the content
145 * @param put_path_length number of entries in put_path
146 * @param put_path peers the original PUT traversed (if tracked)
147 * @param get_path_length number of entries in get_path
148 * @param get_path peers this reply has traversed so far (if tracked)
149 * @param data payload of the reply
150 * @param data_size number of bytes in data
153 GDS_ROUTING_process (enum GNUNET_BLOCK_Type type,
154 struct GNUNET_TIME_Absolute expiration_time,
155 const struct GNUNET_HashCode * key, unsigned int put_path_length,
156 const struct GNUNET_PeerIdentity *put_path,
157 unsigned int get_path_length,
158 const struct GNUNET_PeerIdentity *get_path,
159 const void *data, size_t data_size)
166 * Initialize routing subsystem.
171 routing_table = GNUNET_CONTAINER_multipeermap_create (DHT_MAX_RECENT * 4 / 3, GNUNET_NO);
176 * Shutdown routing subsystem.
181 GNUNET_assert (0 == GNUNET_CONTAINER_multipeermap_size (routing_table));
182 GNUNET_CONTAINER_multipeermap_destroy (routing_table);
185 /* end of gnunet-service-xdht_routing.c */