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
|
/*
Copyright (c) 2012, Matthias Schiffer <mschiffer@universe-factory.net>
Partly based on QuickTun Copyright (c) 2010, Ivo Smits <Ivo@UCIS.nl>.
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _FASTD_FASTD_H_
#define _FASTD_FASTD_H_
#include "queue.h"
#include <errno.h>
#include <linux/if_ether.h>
#include <netinet/in.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/uio.h>
typedef enum _fastd_loglevel {
LOG_FATAL = 0,
LOG_ERROR,
LOG_WARN,
LOG_INFO,
LOG_DEBUG,
} fastd_loglevel;
typedef enum _fastd_packet_type {
PACKET_DATA = 0,
PACKET_HANDSHAKE,
} fastd_packet_type;
typedef struct _fastd_buffer {
void *base;
size_t base_len;
void *data;
size_t len;
} fastd_buffer;
typedef enum _fastd_protocol {
PROTOCOL_ETHERNET,
PROTOCOL_IP,
} fastd_protocol;
typedef struct _fastd_peer_config {
struct _fastd_peer_config *next;
in_addr_t address;
in_port_t port;
} fastd_peer_config;
typedef enum _fastd_peer_state {
STATE_WAIT,
STATE_ESTABLISHED,
STATE_TEMP,
STATE_TEMP_ESTABLISHED,
} fastd_peer_state;
typedef struct _fastd_eth_addr {
uint8_t data[ETH_ALEN];
} fastd_eth_addr;
typedef struct _fastd_peer {
struct _fastd_peer *next;
const fastd_peer_config *config;
in_addr_t address;
in_port_t port;
fastd_peer_state state;
uint8_t last_req_id;
} fastd_peer;
typedef struct _fastd_peer_eth_addr {
fastd_eth_addr addr;
fastd_peer *peer;
} fastd_peer_eth_addr;
typedef struct _fastd_config fastd_config;
typedef struct _fastd_context fastd_context;
typedef struct _fastd_method {
const char *name;
bool (*check_config)(fastd_context *ctx, const fastd_config *conf);
size_t (*max_packet_size)(fastd_context *ctx);
void (*init)(fastd_context *ctx, fastd_peer *peer);
void (*handle_recv)(fastd_context *ctx, fastd_peer *peer, fastd_buffer buffer);
void (*send)(fastd_context *ctx, fastd_peer *peer, fastd_buffer buffer);
} fastd_method;
struct _fastd_config {
fastd_loglevel loglevel;
char *ifname;
in_addr_t bind_address;
in_port_t bind_port;
uint16_t mtu;
fastd_protocol protocol;
fastd_method *method;
unsigned n_floating;
fastd_peer_config *peers;
};
struct _fastd_context {
const fastd_config *conf;
fastd_peer *peers;
fastd_queue task_queue;
int tunfd;
int sockfd;
size_t eth_addr_size;
size_t n_eth_addr;
fastd_peer_eth_addr *eth_addr;
};
#define pr_log(context, level, prefix, args...) if ((context)->conf == NULL || (level) <= (context)->conf->loglevel) \
do { fputs(prefix, stderr); fprintf(stderr, args); fputs("\n", stderr); } while(0)
#define pr_fatal(context, args...) pr_log(context, LOG_FATAL, "Fatal: ", args)
#define pr_error(context, args...) pr_log(context, LOG_ERROR, "Error: ", args)
#define pr_warn(context, args...) pr_log(context, LOG_WARN, "Warning: ", args)
#define pr_info(context, args...) pr_log(context, LOG_INFO, "", args)
#define pr_debug(context, args...) pr_log(context, LOG_DEBUG, "DEBUG: ", args)
#define exit_fatal(context, args...) do { pr_fatal(context, args); abort(); } while(0)
#define exit_bug(context, message) exit_fatal(context, "BUG: %s", message)
#define exit_error(context, args...) do { pr_error(context, args); exit(1); } while(0)
#define exit_errno(context, message) exit_error(context, "%s: %s", message, strerror(errno))
static inline fastd_buffer fastd_buffer_alloc(size_t len, size_t head_space, size_t tail_space) {
size_t base_len = head_space+len+tail_space;
uint8_t *ptr = malloc(head_space+len);
return (fastd_buffer){ .base = ptr, .base_len = base_len, .data = ptr+head_space, .len = len };
}
static inline void fastd_buffer_free(fastd_buffer buffer) {
free(buffer.base);
}
static inline size_t fastd_max_packet_size(const fastd_context *ctx) {
switch (ctx->conf->protocol) {
case PROTOCOL_ETHERNET:
return ctx->conf->mtu+ETH_HLEN;
case PROTOCOL_IP:
return ctx->conf->mtu;
default:
exit_bug(ctx, "invalid protocol");
}
}
#endif /* _FASTD_FASTD_H_ */
|
