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author | Sree Harsha Totakura <totakura@in.tum.de> | 2012-01-10 23:18:38 +0000 |
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committer | Sree Harsha Totakura <totakura@in.tum.de> | 2012-01-10 23:18:38 +0000 |
commit | a068d3a7e4b75a913ccdc4f4606a470c30d5f9e3 (patch) | |
tree | f333a0ce61f19f47c8fbc967fbc008fd7dc7771a /src | |
parent | f1a1df54b3f8e8bfde67df67dcc59e9135110fca (diff) | |
download | gnunet-a068d3a7e4b75a913ccdc4f4606a470c30d5f9e3.tar.gz gnunet-a068d3a7e4b75a913ccdc4f4606a470c30d5f9e3.zip |
stream P2P protocol message specification
Diffstat (limited to 'src')
-rw-r--r-- | src/stream/stream_protocol.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/stream/stream_protocol.h b/src/stream/stream_protocol.h new file mode 100644 index 000000000..20dae355b --- /dev/null +++ b/src/stream/stream_protocol.h | |||
@@ -0,0 +1,190 @@ | |||
1 | /* | ||
2 | This file is part of GNUnet. | ||
3 | (C) 2012 Christian Grothoff (and other contributing authors) | ||
4 | |||
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. | ||
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 | General Public License for more details. | ||
14 | |||
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. | ||
19 | */ | ||
20 | |||
21 | /** | ||
22 | * @file stream/stream_protocol.h | ||
23 | * @brief P2P protocol for the stream connections | ||
24 | * @author Sree Harsha Totakura | ||
25 | */ | ||
26 | |||
27 | #ifndef STREAM_PROTOCOL_H | ||
28 | #define STREAM_PROTOCOL_H | ||
29 | |||
30 | #ifdef __cplusplus | ||
31 | extern "C" | ||
32 | { | ||
33 | #if 0 /* keep Emacsens' auto-indent happy */ | ||
34 | } | ||
35 | #endif | ||
36 | #endif | ||
37 | |||
38 | #include <sys/types.h> | ||
39 | |||
40 | #include "gnunet_stream_lib.h" | ||
41 | #include "gnunet_mesh_service.h" | ||
42 | |||
43 | |||
44 | /** | ||
45 | * Stream message types | ||
46 | */ | ||
47 | enum GNUNET_STREAM_MessageType | ||
48 | { | ||
49 | /** | ||
50 | * Message containing data | ||
51 | */ | ||
52 | GNUNET_STREAM_MESSAGE_DATA, | ||
53 | |||
54 | /** | ||
55 | * ACK message | ||
56 | */ | ||
57 | GNUNET_STREAM_MESSAGE_ACK, | ||
58 | |||
59 | /** | ||
60 | * Handshake hello message | ||
61 | */ | ||
62 | GNUNET_STREAM_MESSAGE_HELLO, | ||
63 | |||
64 | /** | ||
65 | * Handshake hello acknowledgement message | ||
66 | */ | ||
67 | GNUNET_STREAM_MESSAGE_HELLO_ACK, | ||
68 | |||
69 | /** | ||
70 | * Transmit close message (data transmission no longer possible after this | ||
71 | * message) | ||
72 | */ | ||
73 | GNUNET_STREAM_MESSAGE_TRANSMIT_CLOSE, | ||
74 | |||
75 | /** | ||
76 | * Transmit close acknowledgement message | ||
77 | */ | ||
78 | GNUNET_STREAM_MESSAGE_TRANSMIT_CLOSE_ACK, | ||
79 | |||
80 | /** | ||
81 | * Receive close message (data is no loger read by the receiver after this | ||
82 | * message) | ||
83 | */ | ||
84 | GNUNET_STREAM_MESSAGE_RECEIVE_CLOSE, | ||
85 | |||
86 | /** | ||
87 | * Receive close acknowledgement message | ||
88 | */ | ||
89 | GNUNET_STREAM_MESSAGE_RECEIVE_CLOSE_ACK, | ||
90 | |||
91 | /** | ||
92 | * Stream close message (data is no longer sent or read after this message) | ||
93 | */ | ||
94 | GNUNET_STREAM_MESSAGE_CLOSE, | ||
95 | |||
96 | /** | ||
97 | * Close acknowledgement message | ||
98 | */ | ||
99 | GNUNET_STREAM_MESSAGE_CLOSE_ACK | ||
100 | }; | ||
101 | |||
102 | |||
103 | /** | ||
104 | * The stream message header | ||
105 | * | ||
106 | * The message can be of Data, Acknowledgement or both | ||
107 | */ | ||
108 | struct GNUNET_STREAM_MessageHeader | ||
109 | { | ||
110 | /** | ||
111 | * The GNUNET message header | ||
112 | */ | ||
113 | struct GNUNET_MessageHeader header; | ||
114 | |||
115 | /** | ||
116 | * A number which identifies a session | ||
117 | */ | ||
118 | uint16_t session_id; | ||
119 | |||
120 | /** | ||
121 | * The message type | ||
122 | * ? Should we rather use the type field in GNUNET_MessageHeader ? | ||
123 | */ | ||
124 | enum GNUNET_STREAM_MessageType type; | ||
125 | |||
126 | }; | ||
127 | |||
128 | |||
129 | /** | ||
130 | * The Data message, should be prefixed with stream header with its type set to | ||
131 | * GNUNET_STREAM_Data | ||
132 | */ | ||
133 | struct GNUNET_STREAM_DataMessage | ||
134 | { | ||
135 | /** | ||
136 | * Sequence number; Always starts with 0 and should wrap around. | ||
137 | * Immune to Sequence Prediction Attack as we take cover under GNUNET's secure | ||
138 | * messaging | ||
139 | */ | ||
140 | uint32_t seq; | ||
141 | |||
142 | /** | ||
143 | * number of milliseconds to the soft deadline for sending acknowledgement | ||
144 | * measured from the time this message is received. It is optimal for the | ||
145 | * communication to send the ack within the soft deadline | ||
146 | */ | ||
147 | uint16_t ack_deadline; | ||
148 | |||
149 | /** | ||
150 | * The data should be appended here | ||
151 | */ | ||
152 | }; | ||
153 | |||
154 | /** | ||
155 | * The Selective Acknowledgement Bitmap | ||
156 | * | ||
157 | * ? WARNING ? Possibility for Denial of Service ?? | ||
158 | * ? Receiver may force the sender to mantain a buffer of ~ 64*64k !?? | ||
159 | */ | ||
160 | typedef uint64_t GNUNET_STREAM_AckBitmap; | ||
161 | |||
162 | |||
163 | /** | ||
164 | * The Acknowledgment Message, should be prefixed with Stream Message header | ||
165 | * with its type set to GNUNET_STREAM_MESSAGE_ACK | ||
166 | */ | ||
167 | struct GNUNET_STREAM_AckMessage | ||
168 | { | ||
169 | /** | ||
170 | * The sequence number of the Data Message upto which the receiver has filled | ||
171 | * its buffer without any missing packets | ||
172 | */ | ||
173 | uint32_t base_seq; | ||
174 | |||
175 | /** | ||
176 | * The Selective Acknowledgement Bitmap. Computed relative to the base_seq | ||
177 | * (bit n corresponds to the Data message with sequence number base_seq+n) | ||
178 | */ | ||
179 | GNUNET_STREAM_AckBitmap bitmap; | ||
180 | }; | ||
181 | |||
182 | |||
183 | #if 0 /** keep Emacsens' auto-indent happy */ | ||
184 | { | ||
185 | #endif | ||
186 | #ifdef __cplusplus | ||
187 | } | ||
188 | #endif | ||
189 | |||
190 | #endif /* STREAM_PROTOCOL_H */ | ||