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
|
/*
* user-mode-linux networking multicast transport
* Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
*
* based on the existing uml-networking code, which is
* 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 <linux/init.h>
#include <linux/netdevice.h>
#include "umcast.h"
#include <net_kern.h>
struct umcast_init {
char *addr;
int lport;
int rport;
int ttl;
bool unicast;
};
static void umcast_init(struct net_device *dev, void *data)
{
struct uml_net_private *pri;
struct umcast_data *dpri;
struct umcast_init *init = data;
pri = netdev_priv(dev);
dpri = (struct umcast_data *) pri->user;
dpri->addr = init->addr;
dpri->lport = init->lport;
dpri->rport = init->rport;
dpri->unicast = init->unicast;
dpri->ttl = init->ttl;
dpri->dev = dev;
if (dpri->unicast) {
printk(KERN_INFO "ucast backend address: %s:%u listen port: "
"%u\n", dpri->addr, dpri->rport, dpri->lport);
} else {
printk(KERN_INFO "mcast backend multicast address: %s:%u, "
"TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl);
}
}
static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return net_recvfrom(fd, skb_mac_header(skb),
skb->dev->mtu + ETH_HEADER_OTHER);
}
static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
{
return umcast_user_write(fd, skb->data, skb->len,
(struct umcast_data *) &lp->user);
}
static const struct net_kern_info umcast_kern_info = {
.init = umcast_init,
.protocol = eth_protocol,
.read = umcast_read,
.write = umcast_write,
};
static int mcast_setup(char *str, char **mac_out, void *data)
{
struct umcast_init *init = data;
char *port_str = NULL, *ttl_str = NULL, *remain;
char *last;
*init = ((struct umcast_init)
{ .addr = "239.192.168.1",
.lport = 1102,
.ttl = 1 });
remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
NULL);
if (remain != NULL) {
printk(KERN_ERR "mcast_setup - Extra garbage on "
"specification : '%s'\n", remain);
return 0;
}
if (port_str != NULL) {
init->lport = simple_strtoul(port_str, &last, 10);
if ((*last != '\0') || (last == port_str)) {
printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
port_str);
return 0;
}
}
if (ttl_str != NULL) {
init->ttl = simple_strtoul(ttl_str, &last, 10);
if ((*last != '\0') || (last == ttl_str)) {
printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
ttl_str);
return 0;
}
}
init->unicast = false;
init->rport = init->lport;
printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
init->lport, init->ttl);
return 1;
}
static int ucast_setup(char *str, char **mac_out, void *data)
{
struct umcast_init *init = data;
char *lport_str = NULL, *rport_str = NULL, *remain;
char *last;
*init = ((struct umcast_init)
{ .addr = "",
.lport = 1102,
.rport = 1102 });
remain = split_if_spec(str, mac_out, &init->addr,
&lport_str, &rport_str, NULL);
if (remain != NULL) {
printk(KERN_ERR "ucast_setup - Extra garbage on "
"specification : '%s'\n", remain);
return 0;
}
if (lport_str != NULL) {
init->lport = simple_strtoul(lport_str, &last, 10);
if ((*last != '\0') || (last == lport_str)) {
printk(KERN_ERR "ucast_setup - Bad listen port : "
"'%s'\n", lport_str);
return 0;
}
}
if (rport_str != NULL) {
init->rport = simple_strtoul(rport_str, &last, 10);
if ((*last != '\0') || (last == rport_str)) {
printk(KERN_ERR "ucast_setup - Bad remote port : "
"'%s'\n", rport_str);
return 0;
}
}
init->unicast = true;
printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n",
init->lport, init->addr, init->rport);
return 1;
}
static struct transport mcast_transport = {
.list = LIST_HEAD_INIT(mcast_transport.list),
.name = "mcast",
.setup = mcast_setup,
.user = &umcast_user_info,
.kern = &umcast_kern_info,
.private_size = sizeof(struct umcast_data),
.setup_size = sizeof(struct umcast_init),
};
static struct transport ucast_transport = {
.list = LIST_HEAD_INIT(ucast_transport.list),
.name = "ucast",
.setup = ucast_setup,
.user = &umcast_user_info,
.kern = &umcast_kern_info,
.private_size = sizeof(struct umcast_data),
.setup_size = sizeof(struct umcast_init),
};
static int register_umcast(void)
{
register_transport(&mcast_transport);
register_transport(&ucast_transport);
return 0;
}
late_initcall(register_umcast);
|
