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1 /*
2  * user-mode-linux networking multicast transport
3  * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
4  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
5  *
6  * based on the existing uml-networking code, which is
7  * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
8  * James Leu (jleu@mindspring.net).
9  * Copyright (C) 2001 by various other people who didn't put their name here.
10  *
11  * Licensed under the GPL.
12  */
13 
14 #include "linux/init.h"
15 #include <linux/netdevice.h>
16 #include "mcast.h"
17 #include "net_kern.h"
18 
19 struct mcast_init {
20 	char *addr;
21 	int port;
22 	int ttl;
23 };
24 
mcast_init(struct net_device * dev,void * data)25 static void mcast_init(struct net_device *dev, void *data)
26 {
27 	struct uml_net_private *pri;
28 	struct mcast_data *dpri;
29 	struct mcast_init *init = data;
30 
31 	pri = netdev_priv(dev);
32 	dpri = (struct mcast_data *) pri->user;
33 	dpri->addr = init->addr;
34 	dpri->port = init->port;
35 	dpri->ttl = init->ttl;
36 	dpri->dev = dev;
37 
38 	printk("mcast backend multicast address: %s:%u, TTL:%u\n",
39 	       dpri->addr, dpri->port, dpri->ttl);
40 }
41 
mcast_read(int fd,struct sk_buff * skb,struct uml_net_private * lp)42 static int mcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
43 {
44 	return net_recvfrom(fd, skb_mac_header(skb),
45 			    skb->dev->mtu + ETH_HEADER_OTHER);
46 }
47 
mcast_write(int fd,struct sk_buff * skb,struct uml_net_private * lp)48 static int mcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
49 {
50 	return mcast_user_write(fd, skb->data, skb->len,
51 				(struct mcast_data *) &lp->user);
52 }
53 
54 static const struct net_kern_info mcast_kern_info = {
55 	.init			= mcast_init,
56 	.protocol		= eth_protocol,
57 	.read			= mcast_read,
58 	.write			= mcast_write,
59 };
60 
mcast_setup(char * str,char ** mac_out,void * data)61 static int mcast_setup(char *str, char **mac_out, void *data)
62 {
63 	struct mcast_init *init = data;
64 	char *port_str = NULL, *ttl_str = NULL, *remain;
65 	char *last;
66 
67 	*init = ((struct mcast_init)
68 		{ .addr 	= "239.192.168.1",
69 		  .port 	= 1102,
70 		  .ttl 		= 1 });
71 
72 	remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
73 			       NULL);
74 	if (remain != NULL) {
75 		printk(KERN_ERR "mcast_setup - Extra garbage on "
76 		       "specification : '%s'\n", remain);
77 		return 0;
78 	}
79 
80 	if (port_str != NULL) {
81 		init->port = simple_strtoul(port_str, &last, 10);
82 		if ((*last != '\0') || (last == port_str)) {
83 			printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
84 			       port_str);
85 			return 0;
86 		}
87 	}
88 
89 	if (ttl_str != NULL) {
90 		init->ttl = simple_strtoul(ttl_str, &last, 10);
91 		if ((*last != '\0') || (last == ttl_str)) {
92 			printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
93 			       ttl_str);
94 			return 0;
95 		}
96 	}
97 
98 	printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
99 	       init->port, init->ttl);
100 
101 	return 1;
102 }
103 
104 static struct transport mcast_transport = {
105 	.list 		= LIST_HEAD_INIT(mcast_transport.list),
106 	.name 		= "mcast",
107 	.setup  	= mcast_setup,
108 	.user 		= &mcast_user_info,
109 	.kern 		= &mcast_kern_info,
110 	.private_size 	= sizeof(struct mcast_data),
111 	.setup_size 	= sizeof(struct mcast_init),
112 };
113 
register_mcast(void)114 static int register_mcast(void)
115 {
116 	register_transport(&mcast_transport);
117 	return 0;
118 }
119 
120 late_initcall(register_mcast);
121