1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
/*
* Copyright (c) 2017-2019 Cisco and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file hicn_face.h
* @brief hICN socket library
*
* This module provides an interface to managing so-called hICN sockets,
* realizing punting of interest and data packets using a TUN device.
*/
#ifndef HICN_SOCKET_API_H
#define HICN_SOCKET_API_H
#include <stdint.h> // uint*_t
#include <stdlib.h>
#include <hicn/hicn.h>
#include "error.h"
#define BUFSIZE 4096
#define MAX_CONNECTIONS \
255 // We currently limit the number of connections we can establish
#define IF_NAMESIZE 16
/* hICN socket helper */
/** hICN configuration options */
typedef struct {
// uint32_t interval;
/* Identifier used to name hICN TUN interfaces (should be unique) */
char *identifier;
// hicn_format_t format;
} hicn_conf_t;
/**
* hICN adjacency
*/
typedef struct {
char *local_ip_address;
char *gateway_ip_address;
} hicn_adjacency_t;
#define EMPTY_HICN_ADJACENCY \
(hicn_adjacency_t) { 0, 0 }
/* hICN socket operations */
typedef struct {
uint8_t pkbuf[BUFSIZE];
uint32_t rb_pkbuf_r;
uint32_t rb_pkbuf_w;
} hicn_buffer_t;
typedef enum { HS_UNSPEC, HS_LISTENER, HS_CONNECTION } hicn_socket_type_t;
typedef struct hicn_socket_s {
hicn_socket_type_t type;
int fd;
/* Implementation specific state follows */
char tun_name[IF_NAMESIZE];
uint32_t tun_id;
hicn_buffer_t buffer;
void (*cb)(struct hicn_socket_s *, void *, uint8_t *, size_t);
void *cb_data;
union {
struct {
ip_address_t tun_ip_address;
uint32_t interface_id;
/* ID of the corresponding table : avoid default values of 0, 32766 and
* 32767 */
uint8_t table_id;
} connection;
};
} hicn_socket_t;
/**
* hICN global state
*/
typedef struct {
/* Configuration data */
hicn_conf_t *conf;
// We need state associate to each FD, to know what type of socket it is and
// its state.
void *socket_root; /**< A tree of socket indexed by their fd */
} hicn_socket_helper_t;
/**
* Create an hICN instance.
*
* This is used to configure the state of an hICN router consistently between
* a listener and the different connections. It also regroups all the state
* related to hICN functionalities.
*
* @return A pointer to an hICN instance.
*/
hicn_socket_helper_t *hicn_create();
void hicn_destroy();
/**
* Retrieve hICN configuration.
*
* Gets the current configuration of an hICN instance for information purposes,
* or later update it.
*
* TODO
* - We might want to prevent configuration updates while the hICN instance is
* running. Define running...
*
* @param [in] hicn Pointer to hICN instance.
* @return Pointer to an hICN configuration data structure.
*
* @see hicn_set_conf
*/
hicn_conf_t *hicn_get_conf(hicn_socket_helper_t *hicn);
/**
* Update hICN configuration.
*
* @param [in] hicn Pointer to an hICN instance.
* @param [in] hicn_conf Pointer to an hICN configuration data structure.
* @return 0 in case of success, -1 otherwise.
*
* @see hicn_get_conf
*/
int hicn_set_conf(hicn_socket_helper_t *hicn, hicn_conf_t *hicn_conf);
/**
* Release hICN state.
*
* @param [in] hicn Pointer to an hICN instance.
*/
void hicn_free(hicn_socket_helper_t *hicn);
// FIXME doc
int hicn_get_local_address(const ip_address_t *remote_address,
ip_address_t *local_address);
/* hICN socket */
/**
* Create an hICN socket.
*
* An hICN socket abstracts the underlying implementation and allows hICN
* packets to be sent and received independently of the underlying
* implementation.
*
* It is possible to further specialize the socket in a listener socket, and a
* connection socket.
*
* @param [in] hicn Pointer to an hICN instance.
* @param [in] identifier Unique identifier for this socket, used to named the
* TUN device
* @param [in] local_ip_address IP address used locally by the socket (or NULL
* for letting the library decide automatically).
* @return File descriptor (>0) in case of success, -1 otherwise.
*
* @see hicn_listen
* @see hicn_bind
*/
int hicn_socket(hicn_socket_helper_t *hicn, const char *identifier,
const char *local_ip_address);
/**
* Packet punting.
*
* Note that we cannot listen on a socket that is already bound.
*
* @param [in] hicn Pointer to an hICN instance.
* @param [in] fd File descriptor identifying the hICN socket.
* @param [in] prefix Prefix (IPv4 or IPv6) to be bound to hICN in
* RFC-compliant presentation format.
* @return 0 in case of success, -1 otherwise.
*
* @see hicn_socket
*/
int hicn_listen(hicn_socket_helper_t *hicn, int fd, const char *prefix);
/**
* Packet forwarding
* @param [in] hicn Pointer to an hICN instance.
* @param [in] fd File descriptor identifying the hICN socket.
* @param [in] prefix Prefix (IPv4 or IPv6) to be bound to hICN in
* RFC-compliant presentation format.
* @return 0 in case of success, -1 otherwise.
*
* XXX adjacency does not perform any copy heresofar
*
* @see hicn_socket
*/
int hicn_bind(hicn_socket_helper_t *hicn, int fd,
const char *remote_ip_address);
#endif /* HICN_SOCKET_API_H */
|
