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-rw-r--r--src/cadet/gnunet-service-cadet_paths.h181
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diff --git a/src/cadet/gnunet-service-cadet_paths.h b/src/cadet/gnunet-service-cadet_paths.h
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1/*
2 This file is part of GNUnet.
3 Copyright (C) 2001-2017 GNUnet e.V.
4
5 GNUnet is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Affero General Public License as published
7 by the Free Software Foundation, either version 3 of the License,
8 or (at your option) any later version.
9
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 Affero General Public License for more details.
14
15 You should have received a copy of the GNU Affero General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 SPDX-License-Identifier: AGPL3.0-or-later
19 */
20
21/**
22 * @file cadet/gnunet-service-cadet-new_paths.h
23 * @brief Information we track per path.
24 * @author Bartlomiej Polot
25 * @author Christian Grothoff
26 */
27#ifndef GNUNET_SERVICE_CADET_PATHS_H
28#define GNUNET_SERVICE_CADET_PATHS_H
29
30#include "gnunet_util_lib.h"
31#include "gnunet-service-cadet.h"
32
33/**
34 * Create a peer path based on the result of a DHT lookup. If we
35 * already know this path, or one that is longer, simply return NULL.
36 * Otherwise, we try to extend an existing path, or create a new one
37 * if applicable.
38 *
39 * @param get_path path of the get request
40 * @param get_path_length length of @a get_path
41 * @param put_path path of the put request
42 * @param put_path_length length of the @a put_path
43 */
44void
45GCPP_try_path_from_dht (const struct GNUNET_PeerIdentity *get_path,
46 unsigned int get_path_length,
47 const struct GNUNET_PeerIdentity *put_path,
48 unsigned int put_path_length);
49
50
51/**
52 * We got an incoming connection, obtain the corresponding path.
53 *
54 * @param path_length number of segments on the @a path
55 * @param path through the network, in reverse order (we are at the end!)
56 * @return corresponding path object
57 */
58struct CadetPeerPath *
59GCPP_get_path_from_route (unsigned int path_length,
60 const struct GNUNET_PeerIdentity *pids);
61
62
63/**
64 * Return the length of the path. Excludes one end of the
65 * path, so the loopback path has length 0.
66 *
67 * @param path path to return the length for
68 * @return number of peers on the path
69 */
70unsigned int
71GCPP_get_length (struct CadetPeerPath *path);
72
73
74/**
75 * Return connection to @a destination using @a path, or return
76 * NULL if no such connection exists.
77 *
78 * @param path path to traverse
79 * @param destination destination node to get to, must be on path
80 * @param off offset of @a destination on @a path
81 * @return NULL if we have no existing connection
82 * otherwise connection from us to @a destination via @a path
83 */
84struct CadetConnection *
85GCPP_get_connection (struct CadetPeerPath *path,
86 struct CadetPeer *destination,
87 unsigned int off);
88
89
90/**
91 * Notify @a path that it is used for connection @a cc
92 * which ends at the path's offset @a off.
93 *
94 * @param path the path to remember the @a cc
95 * @param off the offset where the @a cc ends
96 * @param cc the connection to remember
97 */
98void
99GCPP_add_connection (struct CadetPeerPath *path,
100 unsigned int off,
101 struct CadetConnection *cc);
102
103
104/**
105 * Notify @a path that it is no longer used for connection @a cc which
106 * ended at the path's offset @a off.
107 *
108 * @param path the path to forget the @a cc
109 * @param off the offset where the @a cc ended
110 * @param cc the connection to forget
111 */
112void
113GCPP_del_connection (struct CadetPeerPath *path,
114 unsigned int off,
115 struct CadetConnection *cc);
116
117
118/**
119 * Find peer's offset on path.
120 *
121 * @param path path to search
122 * @param cp peer to look for
123 * @return offset of @a cp on @a path, or UINT_MAX if not found
124 */
125unsigned int
126GCPP_find_peer (struct CadetPeerPath *path,
127 struct CadetPeer *cp);
128
129
130/**
131 * Return how much we like keeping the path. This is an aggregate
132 * score based on various factors, including the age of the path
133 * (older == better), and the value of this path to all of its adjacent
134 * peers. For example, long paths that end at a peer that we have no
135 * shorter way to reach are very desirable, while long paths that end
136 * at a peer for which we have a shorter way as well are much less
137 * desirable. Higher values indicate more valuable paths. The
138 * returned value should be used to decide which paths to remember.
139 *
140 * @param path path to return the length for
141 * @return desirability of the path, larger is more desirable
142 */
143GNUNET_CONTAINER_HeapCostType
144GCPP_get_desirability (const struct CadetPeerPath *path);
145
146
147/**
148 * The given peer @a cp used to own this @a path. However, it is no
149 * longer interested in maintaining it, so the path should be
150 * discarded or shortened (in case a previous peer on the path finds
151 * the path desirable).
152 *
153 * @param path the path that is being released
154 */
155void
156GCPP_release (struct CadetPeerPath *path);
157
158
159/**
160 * Obtain the peer at offset @a off in @a path.
161 *
162 * @param path peer path to inspect
163 * @param off offset to return, must be smaller than path length
164 * @return peer at offset @a off
165 */
166struct CadetPeer *
167GCPP_get_peer_at_offset (struct CadetPeerPath *path,
168 unsigned int off);
169
170
171/**
172 * Convert a path to a human-readable string.
173 *
174 * @param path path to convert
175 * @return string, statically allocated
176 */
177const char *
178GCPP_2s (struct CadetPeerPath *p);
179
180
181#endif