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
|
/*
* Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
* James Leu (jleu@mindspring.net).
* Copyright (C) 2001 by various other people who didn't put their name here.
* Licensed under the GPL.
*/
#include <errno.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/time.h>
#include "net_user.h"
#include "daemon.h"
#include "kern_util.h"
#include "user_util.h"
#include "user.h"
#include "os.h"
#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER)
enum request_type { REQ_NEW_CONTROL };
#define SWITCH_MAGIC 0xfeedface
struct request_v3 {
uint32_t magic;
uint32_t version;
enum request_type type;
struct sockaddr_un sock;
};
static struct sockaddr_un *new_addr(void *name, int len)
{
struct sockaddr_un *sun;
sun = um_kmalloc(sizeof(struct sockaddr_un));
if(sun == NULL){
printk("new_addr: allocation of sockaddr_un failed\n");
return(NULL);
}
sun->sun_family = AF_UNIX;
memcpy(sun->sun_path, name, len);
return(sun);
}
static int connect_to_switch(struct daemon_data *pri)
{
struct sockaddr_un *ctl_addr = pri->ctl_addr;
struct sockaddr_un *local_addr = pri->local_addr;
struct sockaddr_un *sun;
struct request_v3 req;
int fd, n, err;
pri->control = socket(AF_UNIX, SOCK_STREAM, 0);
if(pri->control < 0){
printk("daemon_open : control socket failed, errno = %d\n",
errno);
return(-errno);
}
if(connect(pri->control, (struct sockaddr *) ctl_addr,
sizeof(*ctl_addr)) < 0){
printk("daemon_open : control connect failed, errno = %d\n",
errno);
err = -errno;
goto out;
}
fd = socket(AF_UNIX, SOCK_DGRAM, 0);
if(fd < 0){
printk("daemon_open : data socket failed, errno = %d\n",
errno);
err = -errno;
goto out;
}
if(bind(fd, (struct sockaddr *) local_addr, sizeof(*local_addr)) < 0){
printk("daemon_open : data bind failed, errno = %d\n",
errno);
err = -errno;
goto out_close;
}
sun = um_kmalloc(sizeof(struct sockaddr_un));
if(sun == NULL){
printk("new_addr: allocation of sockaddr_un failed\n");
err = -ENOMEM;
goto out_close;
}
req.magic = SWITCH_MAGIC;
req.version = SWITCH_VERSION;
req.type = REQ_NEW_CONTROL;
req.sock = *local_addr;
n = os_write_file(pri->control, &req, sizeof(req));
if(n != sizeof(req)){
printk("daemon_open : control setup request failed, err = %d\n",
-n);
err = -ENOTCONN;
goto out;
}
n = os_read_file(pri->control, sun, sizeof(*sun));
if(n != sizeof(*sun)){
printk("daemon_open : read of data socket failed, err = %d\n",
-n);
err = -ENOTCONN;
goto out_close;
}
pri->data_addr = sun;
return(fd);
out_close:
os_close_file(fd);
out:
os_close_file(pri->control);
return(err);
}
static void daemon_user_init(void *data, void *dev)
{
struct daemon_data *pri = data;
struct timeval tv;
struct {
char zero;
int pid;
int usecs;
} name;
if(!strcmp(pri->sock_type, "unix"))
pri->ctl_addr = new_addr(pri->ctl_sock,
strlen(pri->ctl_sock) + 1);
name.zero = 0;
name.pid = os_getpid();
gettimeofday(&tv, NULL);
name.usecs = tv.tv_usec;
pri->local_addr = new_addr(&name, sizeof(name));
pri->dev = dev;
pri->fd = connect_to_switch(pri);
if(pri->fd < 0){
kfree(pri->local_addr);
pri->local_addr = NULL;
}
}
static int daemon_open(void *data)
{
struct daemon_data *pri = data;
return(pri->fd);
}
static void daemon_remove(void *data)
{
struct daemon_data *pri = data;
os_close_file(pri->fd);
os_close_file(pri->control);
kfree(pri->data_addr);
kfree(pri->ctl_addr);
kfree(pri->local_addr);
}
int daemon_user_write(int fd, void *buf, int len, struct daemon_data *pri)
{
struct sockaddr_un *data_addr = pri->data_addr;
return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr)));
}
static int daemon_set_mtu(int mtu, void *data)
{
return(mtu);
}
struct net_user_info daemon_user_info = {
.init = daemon_user_init,
.open = daemon_open,
.close = NULL,
.remove = daemon_remove,
.set_mtu = daemon_set_mtu,
.add_address = NULL,
.delete_address = NULL,
.max_packet = MAX_PACKET - ETH_HEADER_OTHER
};
/*
* Overrides for Emacs so that we follow Linus's tabbing style.
* Emacs will notice this stuff at the end of the file and automatically
* adjust the settings for this buffer only. This must remain at the end
* of the file.
* ---------------------------------------------------------------------------
* Local variables:
* c-file-style: "linux"
* End:
*/
|
