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)
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.
11 * Licensed under the GPL.
14 #include "linux/init.h"
15 #include <linux/netdevice.h>
25 static void mcast_init(struct net_device *dev, void *data)
27 struct uml_net_private *pri;
28 struct mcast_data *dpri;
29 struct mcast_init *init = data;
32 dpri = (struct mcast_data *) pri->user;
33 dpri->addr = init->addr;
34 dpri->port = init->port;
35 dpri->ttl = init->ttl;
38 printk("mcast backend multicast address: %s:%u, TTL:%u\n",
39 dpri->addr, dpri->port, dpri->ttl);
42 static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
44 *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
47 return net_recvfrom(fd, skb_mac_header(*skb),
48 (*skb)->dev->mtu + ETH_HEADER_OTHER);
51 static int mcast_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
53 return mcast_user_write(fd, (*skb)->data, (*skb)->len,
54 (struct mcast_data *) &lp->user);
57 static const struct net_kern_info mcast_kern_info = {
59 .protocol = eth_protocol,
64 int mcast_setup(char *str, char **mac_out, void *data)
66 struct mcast_init *init = data;
67 char *port_str = NULL, *ttl_str = NULL, *remain;
70 *init = ((struct mcast_init)
71 { .addr = "239.192.168.1",
75 remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
78 printk(KERN_ERR "mcast_setup - Extra garbage on "
79 "specification : '%s'\n", remain);
83 if (port_str != NULL) {
84 init->port = simple_strtoul(port_str, &last, 10);
85 if ((*last != '\0') || (last == port_str)) {
86 printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
92 if (ttl_str != NULL) {
93 init->ttl = simple_strtoul(ttl_str, &last, 10);
94 if ((*last != '\0') || (last == ttl_str)) {
95 printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
101 printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
102 init->port, init->ttl);
107 static struct transport mcast_transport = {
108 .list = LIST_HEAD_INIT(mcast_transport.list),
110 .setup = mcast_setup,
111 .user = &mcast_user_info,
112 .kern = &mcast_kern_info,
113 .private_size = sizeof(struct mcast_data),
114 .setup_size = sizeof(struct mcast_init),
117 static int register_mcast(void)
119 register_transport(&mcast_transport);
123 late_initcall(register_mcast);