/* * 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;};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 adddress: %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(1);}__initcall(register_mcast);/* * Overrides for Emacs so that we follow Linus's tabbing style. * Emacs will notice this stuff at the end of the file and automatically * adjust the settings for this buffer only.  This must remain at the end * of the file. * --------------------------------------------------------------------------- * Local variables: * c-file-style: "linux" * End: */