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
|
/*
* user-mode-linux networking multicast transport
* Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
*
* 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/kernel.h"
#include "linux/init.h"
#include "linux/netdevice.h"
#include "linux/etherdevice.h"
#include "linux/in.h"
#include "linux/inet.h"
#include "net_kern.h"
#include "net_user.h"
#include "mcast.h"
struct mcast_init {
char *addr;
int port;
int ttl;
};
static void mcast_init(struct net_device *dev, void *data)
{
struct uml_net_private *pri;
struct mcast_data *dpri;
struct mcast_init *init = data;
pri = dev->priv;
dpri = (struct mcast_data *) pri->user;
dpri->addr = init->addr;
dpri->port = init->port;
dpri->ttl = init->ttl;
dpri->dev = dev;
printk("mcast backend ");
printk("multicast address: %s:%u, TTL:%u ",
dpri->addr, dpri->port, dpri->ttl);
printk("\n");
}
static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
{
*skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
if(*skb == NULL) return(-ENOMEM);
return(net_recvfrom(fd, (*skb)->mac.raw,
(*skb)->dev->mtu + ETH_HEADER_OTHER));
}
static int mcast_write(int fd, struct sk_buff **skb,
struct uml_net_private *lp)
{
return mcast_user_write(fd, (*skb)->data, (*skb)->len,
(struct mcast_data *) &lp->user);
}
static struct net_kern_info mcast_kern_info = {
.init = mcast_init,
.protocol = eth_protocol,
.read = mcast_read,
.write = mcast_write,
};
int mcast_setup(char *str, char **mac_out, void *data)
{
struct mcast_init *init = data;
char *port_str = NULL, *ttl_str = NULL, *remain;
char *last;
*init = ((struct mcast_init)
{ .addr = "239.192.168.1",
.port = 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->port = 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);
}
}
printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
init->port, init->ttl);
return(1);
}
static struct transport mcast_transport = {
.list = LIST_HEAD_INIT(mcast_transport.list),
.name = "mcast",
.setup = mcast_setup,
.user = &mcast_user_info,
.kern = &mcast_kern_info,
.private_size = sizeof(struct mcast_data),
.setup_size = sizeof(struct mcast_init),
};
static int register_mcast(void)
{
register_transport(&mcast_transport);
return 0;
}
__initcall(register_mcast);
|
