1 files changed, 143 insertions, 0 deletions
diff --git a/arch/um/drivers/mcast_kern.c b/arch/um/drivers/mcast_kern.c
new file mode 100644
index 000000000000..faf714e87b5b
--- /dev/null
+++ b/arch/um/drivers/mcast_kern.c
@@ -0,0 +1,143 @@
+/*
+ * 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;
+	int n;
+
+	*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){
+		n = 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);
+		}
+		init->port = htons(n);
+	}
+
+	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:
+ */