2 * user-mode-linux networking multicast transport
3 * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org>
5 * based on the existing uml-networking code, which is
6 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
7 * James Leu (jleu@mindspring.net).
8 * Copyright (C) 2001 by various other people who didn't put their name here.
10 * Licensed under the GPL.
13 #include "linux/kernel.h"
14 #include "linux/init.h"
15 #include "linux/netdevice.h"
16 #include "linux/etherdevice.h"
18 #include "linux/inet.h"
29 void mcast_init(struct net_device *dev, void *data)
31 struct uml_net_private *pri;
32 struct mcast_data *dpri;
33 struct mcast_init *init = data;
36 dpri = (struct mcast_data *) pri->user;
37 dpri->addr = init->addr;
38 dpri->port = init->port;
39 dpri->ttl = init->ttl;
42 printk("mcast backend ");
43 printk("multicast adddress: %s:%u, TTL:%u ",
44 dpri->addr, dpri->port, dpri->ttl);
49 static int mcast_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
51 *skb = ether_adjust_skb(*skb, ETH_HEADER_OTHER);
52 if(*skb == NULL) return(-ENOMEM);
53 return(net_recvfrom(fd, (*skb)->mac.raw,
54 (*skb)->dev->mtu + ETH_HEADER_OTHER));
57 static int mcast_write(int fd, struct sk_buff **skb,
58 struct uml_net_private *lp)
60 return mcast_user_write(fd, (*skb)->data, (*skb)->len,
61 (struct mcast_data *) &lp->user);
64 static struct net_kern_info mcast_kern_info = {
66 .protocol = eth_protocol,
71 int mcast_setup(char *str, char **mac_out, void *data)
73 struct mcast_init *init = data;
74 char *port_str = NULL, *ttl_str = NULL, *remain;
78 *init = ((struct mcast_init)
79 { .addr = "239.192.168.1",
83 remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str,
86 printk(KERN_ERR "mcast_setup - Extra garbage on "
87 "specification : '%s'\n", remain);
92 n = simple_strtoul(port_str, &last, 10);
93 if((*last != '\0') || (last == port_str)){
94 printk(KERN_ERR "mcast_setup - Bad port : '%s'\n",
98 init->port = htons(n);
102 init->ttl = simple_strtoul(ttl_str, &last, 10);
103 if((*last != '\0') || (last == ttl_str)){
104 printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n",
110 printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr,
111 init->port, init->ttl);
116 static struct transport mcast_transport = {
117 .list = LIST_HEAD_INIT(mcast_transport.list),
119 .setup = mcast_setup,
120 .user = &mcast_user_info,
121 .kern = &mcast_kern_info,
122 .private_size = sizeof(struct mcast_data),
123 .setup_size = sizeof(struct mcast_init),
126 static int register_mcast(void)
128 register_transport(&mcast_transport);
132 __initcall(register_mcast);
135 * Overrides for Emacs so that we follow Linus's tabbing style.
136 * Emacs will notice this stuff at the end of the file and automatically
137 * adjust the settings for this buffer only. This must remain at the end
139 * ---------------------------------------------------------------------------
141 * c-file-style: "linux"