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 "umcast.h"
17#include <net_kern.h>
18
19struct umcast_init {
20	char *addr;
21	int lport;
22	int rport;
23	int ttl;
24	bool unicast;
25};
26
27static void umcast_init(struct net_device *dev, void *data)
28{
29	struct uml_net_private *pri;
30	struct umcast_data *dpri;
31	struct umcast_init *init = data;
32
33	pri = netdev_priv(dev);
34	dpri = (struct umcast_data *) pri->user;
35	dpri->addr = init->addr;
36	dpri->lport = init->lport;
37	dpri->rport = init->rport;
38	dpri->unicast = init->unicast;
39	dpri->ttl = init->ttl;
40	dpri->dev = dev;
41
42	if (dpri->unicast) {
43		printk(KERN_INFO "ucast backend address: %s:%u listen port: "
44		       "%u\n", dpri->addr, dpri->rport, dpri->lport);
45	} else {
46		printk(KERN_INFO "mcast backend multicast address: %s:%u, "
47		       "TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl);
48	}
49}
50
51static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
52{
53	return net_recvfrom(fd, skb_mac_header(skb),
54			    skb->dev->mtu + ETH_HEADER_OTHER);
55}
56
57static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
58{
59	return umcast_user_write(fd, skb->data, skb->len,
60				(struct umcast_data *) &lp->user);
61}
62
63static const struct net_kern_info umcast_kern_info = {
64	.init			= umcast_init,
65	.protocol		= eth_protocol,
66	.read			= umcast_read,
67	.write			= umcast_write,
68};
69
70static int mcast_setup(char *str, char **mac_out, void *data)
71{
72	struct umcast_init *init = data;
73	char *port_str = NULL, *ttl_str = NULL, *remain;
74	char *last;
75
76	*init = ((struct umcast_init)
77		{ .addr	= "239.192.168.1",
78		  .lport	= 1102,
79		  .ttl	= 1 });
80
81	remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
82			       NULL);
83	if (remain != NULL) {
84		printk(KERN_ERR "mcast_setup - Extra garbage on "
85		       "specification : '%s'\n", remain);
86		return 0;
87	}
88
89	if (port_str != NULL) {
90		init->lport = simple_strtoul(port_str, &last, 10);
91		if ((*last != '\0') || (last == port_str)) {
92			printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
93			       port_str);
94			return 0;
95		}
96	}
97
98	if (ttl_str != NULL) {
99		init->ttl = simple_strtoul(ttl_str, &last, 10);
100		if ((*last != '\0') || (last == ttl_str)) {
101			printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
102			       ttl_str);
103			return 0;
104		}
105	}
106
107	init->unicast = false;
108	init->rport = init->lport;
109
110	printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
111	       init->lport, init->ttl);
112
113	return 1;
114}
115
116static int ucast_setup(char *str, char **mac_out, void *data)
117{
118	struct umcast_init *init = data;
119	char *lport_str = NULL, *rport_str = NULL, *remain;
120	char *last;
121
122	*init = ((struct umcast_init)
123		{ .addr		= "",
124		  .lport	= 1102,
125		  .rport	= 1102 });
126
127	remain = split_if_spec(str, mac_out, &init->addr,
128			       &lport_str, &rport_str, NULL);
129	if (remain != NULL) {
130		printk(KERN_ERR "ucast_setup - Extra garbage on "
131		       "specification : '%s'\n", remain);
132		return 0;
133	}
134
135	if (lport_str != NULL) {
136		init->lport = simple_strtoul(lport_str, &last, 10);
137		if ((*last != '\0') || (last == lport_str)) {
138			printk(KERN_ERR "ucast_setup - Bad listen port : "
139			       "'%s'\n", lport_str);
140			return 0;
141		}
142	}
143
144	if (rport_str != NULL) {
145		init->rport = simple_strtoul(rport_str, &last, 10);
146		if ((*last != '\0') || (last == rport_str)) {
147			printk(KERN_ERR "ucast_setup - Bad remote port : "
148			       "'%s'\n", rport_str);
149			return 0;
150		}
151	}
152
153	init->unicast = true;
154
155	printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n",
156	       init->lport, init->addr, init->rport);
157
158	return 1;
159}
160
161static struct transport mcast_transport = {
162	.list	= LIST_HEAD_INIT(mcast_transport.list),
163	.name	= "mcast",
164	.setup	= mcast_setup,
165	.user	= &umcast_user_info,
166	.kern	= &umcast_kern_info,
167	.private_size	= sizeof(struct umcast_data),
168	.setup_size	= sizeof(struct umcast_init),
169};
170
171static struct transport ucast_transport = {
172	.list	= LIST_HEAD_INIT(ucast_transport.list),
173	.name	= "ucast",
174	.setup	= ucast_setup,
175	.user	= &umcast_user_info,
176	.kern	= &umcast_kern_info,
177	.private_size	= sizeof(struct umcast_data),
178	.setup_size	= sizeof(struct umcast_init),
179};
180
181static int register_umcast(void)
182{
183	register_transport(&mcast_transport);
184	register_transport(&ucast_transport);
185	return 0;
186}
187
188late_initcall(register_umcast);
189