7 files changed, 760 insertions, 0 deletions

diff --git a/arch/um/os-Linux/drivers/Makefile b/arch/um/os-Linux/drivers/Makefile
new file mode 100644
index 000000000000..6c546dc9222b
--- /dev/null
+++ b/arch/um/os-Linux/drivers/Makefile
@@ -0,0 +1,13 @@
+# 
+# Copyright (C) 2000, 2002 Jeff Dike (jdike@karaya.com)
+# Licensed under the GPL
+#
+
+ethertap-objs := ethertap_kern.o ethertap_user.o
+tuntap-objs := tuntap_kern.o tuntap_user.o
+
+obj-y = 
+obj-$(CONFIG_UML_NET_ETHERTAP) += ethertap.o
+obj-$(CONFIG_UML_NET_TUNTAP) += tuntap.o
+
+include arch/um/scripts/Makefile.rules
diff --git a/arch/um/os-Linux/drivers/etap.h b/arch/um/os-Linux/drivers/etap.h
new file mode 100644
index 000000000000..b84f6c4740f7
--- /dev/null
+++ b/arch/um/os-Linux/drivers/etap.h
@@ -0,0 +1,27 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "net_user.h"
+
+struct ethertap_data {
+	char *dev_name;
+	char *gate_addr;
+	int data_fd;
+	int control_fd;
+	void *dev;
+};
+
+extern struct net_user_info ethertap_user_info;
+
+/*
+ * 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:
+ */
diff --git a/arch/um/os-Linux/drivers/ethertap_kern.c b/arch/um/os-Linux/drivers/ethertap_kern.c
new file mode 100644
index 000000000000..6ae4b19d9f50
--- /dev/null
+++ b/arch/um/os-Linux/drivers/ethertap_kern.c
@@ -0,0 +1,119 @@
+/*
+ * 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/init.h"
+#include "linux/netdevice.h"
+#include "linux/etherdevice.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "etap.h"
+
+struct ethertap_init {
+	char *dev_name;
+	char *gate_addr;
+};
+
+static void etap_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *pri;
+	struct ethertap_data *epri;
+	struct ethertap_init *init = data;
+
+	pri = dev->priv;
+	epri = (struct ethertap_data *) pri->user;
+	epri->dev_name = init->dev_name;
+	epri->gate_addr = init->gate_addr;
+	epri->data_fd = -1;
+	epri->control_fd = -1;
+	epri->dev = dev;
+
+	printk("ethertap backend - %s", epri->dev_name);
+	if (epri->gate_addr != NULL)
+		printk(", IP = %s", epri->gate_addr);
+	printk("\n");
+}
+
+static int etap_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+{
+	int len;
+
+	*skb = ether_adjust_skb(*skb, ETH_HEADER_ETHERTAP);
+	if(*skb == NULL) return(-ENOMEM);
+	len = net_recvfrom(fd, (*skb)->mac.raw, 
+			   (*skb)->dev->mtu + 2 * ETH_HEADER_ETHERTAP);
+	if(len <= 0) return(len);
+	skb_pull(*skb, 2);
+	len -= 2;
+	return(len);
+}
+
+static int etap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+{
+	if(skb_headroom(*skb) < 2){
+	  	struct sk_buff *skb2;
+
+		skb2 = skb_realloc_headroom(*skb, 2);
+		dev_kfree_skb(*skb);
+		if (skb2 == NULL) return(-ENOMEM);
+		*skb = skb2;
+	}
+	skb_push(*skb, 2);
+	return(net_send(fd, (*skb)->data, (*skb)->len));
+}
+
+struct net_kern_info ethertap_kern_info = {
+	.init			= etap_init,
+	.protocol		= eth_protocol,
+	.read			= etap_read,
+	.write 			= etap_write,
+};
+
+int ethertap_setup(char *str, char **mac_out, void *data)
+{
+	struct ethertap_init *init = data;
+
+	*init = ((struct ethertap_init)
+		{ .dev_name 	= NULL,
+		  .gate_addr 	= NULL });
+	if(tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
+			    &init->gate_addr))
+		return(0);
+	if(init->dev_name == NULL){
+		printk("ethertap_setup : Missing tap device name\n");
+		return(0);
+	}
+
+	return(1);
+}
+
+static struct transport ethertap_transport = {
+	.list 		= LIST_HEAD_INIT(ethertap_transport.list),
+	.name 		= "ethertap",
+	.setup  	= ethertap_setup,
+	.user 		= &ethertap_user_info,
+	.kern 		= &ethertap_kern_info,
+	.private_size 	= sizeof(struct ethertap_data),
+};
+
+static int register_ethertap(void)
+{
+	register_transport(&ethertap_transport);
+	return(1);
+}
+
+__initcall(register_ethertap);
+
+/*
+ * 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:
+ */
diff --git a/arch/um/os-Linux/drivers/ethertap_user.c b/arch/um/os-Linux/drivers/ethertap_user.c
new file mode 100644
index 000000000000..cd4d6544da71
--- /dev/null
+++ b/arch/um/os-Linux/drivers/ethertap_user.c
@@ -0,0 +1,240 @@
+/*
+ * 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 <stdio.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <sys/errno.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <sys/un.h>
+#include <net/if.h>
+#include "user.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "net_user.h"
+#include "etap.h"
+#include "helper.h"
+#include "os.h"
+
+#define MAX_PACKET ETH_MAX_PACKET
+
+void etap_user_init(void *data, void *dev)
+{
+	struct ethertap_data *pri = data;
+
+	pri->dev = dev;
+}
+
+struct addr_change {
+	enum { ADD_ADDR, DEL_ADDR } what;
+	unsigned char addr[4];
+	unsigned char netmask[4];
+};
+
+static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
+			int fd)
+{
+	struct addr_change change;
+	void *output;
+	int n;
+
+	change.what = op;
+	memcpy(change.addr, addr, sizeof(change.addr));
+	memcpy(change.netmask, netmask, sizeof(change.netmask));
+	n = os_write_file(fd, &change, sizeof(change));
+	if(n != sizeof(change))
+		printk("etap_change - request failed, err = %d\n", -n);
+	output = um_kmalloc(page_size());
+	if(output == NULL)
+		printk("etap_change : Failed to allocate output buffer\n");
+	read_output(fd, output, page_size());
+	if(output != NULL){
+		printk("%s", output);
+		kfree(output);
+	}
+}
+
+static void etap_open_addr(unsigned char *addr, unsigned char *netmask,
+			   void *arg)
+{
+	etap_change(ADD_ADDR, addr, netmask, *((int *) arg));
+}
+
+static void etap_close_addr(unsigned char *addr, unsigned char *netmask,
+			    void *arg)
+{
+	etap_change(DEL_ADDR, addr, netmask, *((int *) arg));
+}
+
+struct etap_pre_exec_data {
+	int control_remote;
+	int control_me;
+	int data_me;
+};
+
+static void etap_pre_exec(void *arg)
+{
+	struct etap_pre_exec_data *data = arg;
+
+	dup2(data->control_remote, 1);
+	os_close_file(data->data_me);
+	os_close_file(data->control_me);
+}
+
+static int etap_tramp(char *dev, char *gate, int control_me, 
+		      int control_remote, int data_me, int data_remote)
+{
+	struct etap_pre_exec_data pe_data;
+	int pid, status, err, n;
+	char version_buf[sizeof("nnnnn\0")];
+	char data_fd_buf[sizeof("nnnnnn\0")];
+	char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
+	char *setup_args[] = { "uml_net", version_buf, "ethertap", dev,
+			       data_fd_buf, gate_buf, NULL };
+	char *nosetup_args[] = { "uml_net", version_buf, "ethertap", 
+				 dev, data_fd_buf, NULL };
+	char **args, c;
+
+	sprintf(data_fd_buf, "%d", data_remote);
+	sprintf(version_buf, "%d", UML_NET_VERSION);
+	if(gate != NULL){
+		strcpy(gate_buf, gate);
+		args = setup_args;
+	}
+	else args = nosetup_args;
+
+	err = 0;
+	pe_data.control_remote = control_remote;
+	pe_data.control_me = control_me;
+	pe_data.data_me = data_me;
+	pid = run_helper(etap_pre_exec, &pe_data, args, NULL);
+
+	if(pid < 0) err = pid;
+	os_close_file(data_remote);
+	os_close_file(control_remote);
+	n = os_read_file(control_me, &c, sizeof(c));
+	if(n != sizeof(c)){
+		printk("etap_tramp : read of status failed, err = %d\n", -n);
+		return(-EINVAL);
+	}
+	if(c != 1){
+		printk("etap_tramp : uml_net failed\n");
+		err = -EINVAL;
+		CATCH_EINTR(n = waitpid(pid, &status, 0));
+		if(n < 0)
+			err = -errno;
+		else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 1))
+			printk("uml_net didn't exit with status 1\n");
+	}
+	return(err);
+}
+
+static int etap_open(void *data)
+{
+	struct ethertap_data *pri = data;
+	char *output;
+	int data_fds[2], control_fds[2], err, output_len;
+
+	err = tap_open_common(pri->dev, pri->gate_addr);
+	if(err) return(err);
+
+	err = os_pipe(data_fds, 0, 0);
+	if(err < 0){
+		printk("data os_pipe failed - err = %d\n", -err);
+		return(err);
+	}
+
+	err = os_pipe(control_fds, 1, 0);
+	if(err < 0){
+		printk("control os_pipe failed - err = %d\n", -err);
+		return(err);
+	}
+	
+	err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0], 
+			 control_fds[1], data_fds[0], data_fds[1]);
+	output_len = page_size();
+	output = um_kmalloc(output_len);
+	read_output(control_fds[0], output, output_len);
+
+	if(output == NULL)
+		printk("etap_open : failed to allocate output buffer\n");
+	else {
+		printk("%s", output);
+		kfree(output);
+	}
+
+	if(err < 0){
+		printk("etap_tramp failed - err = %d\n", -err);
+		return(err);
+	}
+
+	pri->data_fd = data_fds[0];
+	pri->control_fd = control_fds[0];
+	iter_addresses(pri->dev, etap_open_addr, &pri->control_fd);
+	return(data_fds[0]);
+}
+
+static void etap_close(int fd, void *data)
+{
+	struct ethertap_data *pri = data;
+
+	iter_addresses(pri->dev, etap_close_addr, &pri->control_fd);
+	os_close_file(fd);
+	os_shutdown_socket(pri->data_fd, 1, 1);
+	os_close_file(pri->data_fd);
+	pri->data_fd = -1;
+	os_close_file(pri->control_fd);
+	pri->control_fd = -1;
+}
+
+static int etap_set_mtu(int mtu, void *data)
+{
+	return(mtu);
+}
+
+static void etap_add_addr(unsigned char *addr, unsigned char *netmask,
+			  void *data)
+{
+	struct ethertap_data *pri = data;
+
+	tap_check_ips(pri->gate_addr, addr);
+	if(pri->control_fd == -1) return;
+	etap_open_addr(addr, netmask, &pri->control_fd);
+}
+
+static void etap_del_addr(unsigned char *addr, unsigned char *netmask, 
+			  void *data)
+{
+	struct ethertap_data *pri = data;
+
+	if(pri->control_fd == -1) return;
+	etap_close_addr(addr, netmask, &pri->control_fd);
+}
+
+struct net_user_info ethertap_user_info = {
+	.init		= etap_user_init,
+	.open		= etap_open,
+	.close	 	= etap_close,
+	.remove	 	= NULL,
+	.set_mtu	= etap_set_mtu,
+	.add_address	= etap_add_addr,
+	.delete_address = etap_del_addr,
+	.max_packet	= MAX_PACKET - ETH_HEADER_ETHERTAP
+};
+
+/*
+ * 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:
+ */
diff --git a/arch/um/os-Linux/drivers/tuntap.h b/arch/um/os-Linux/drivers/tuntap.h
new file mode 100644
index 000000000000..25d4a2868814
--- /dev/null
+++ b/arch/um/os-Linux/drivers/tuntap.h
@@ -0,0 +1,32 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#ifndef __UM_TUNTAP_H
+#define __UM_TUNTAP_H
+
+#include "net_user.h"
+
+struct tuntap_data {
+	char *dev_name;
+	int fixed_config;
+	char *gate_addr;
+	int fd;
+	void *dev;
+};
+
+extern struct net_user_info tuntap_user_info;
+
+#endif
+
+/*
+ * 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:
+ */
diff --git a/arch/um/os-Linux/drivers/tuntap_kern.c b/arch/um/os-Linux/drivers/tuntap_kern.c
new file mode 100644
index 000000000000..4202b9ebad4c
--- /dev/null
+++ b/arch/um/os-Linux/drivers/tuntap_kern.c
@@ -0,0 +1,104 @@
+/* 
+ * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/stddef.h"
+#include "linux/netdevice.h"
+#include "linux/etherdevice.h"
+#include "linux/skbuff.h"
+#include "linux/init.h"
+#include "asm/errno.h"
+#include "net_kern.h"
+#include "net_user.h"
+#include "tuntap.h"
+
+struct tuntap_init {
+	char *dev_name;
+	char *gate_addr;
+};
+
+static void tuntap_init(struct net_device *dev, void *data)
+{
+	struct uml_net_private *pri;
+	struct tuntap_data *tpri;
+	struct tuntap_init *init = data;
+
+	pri = dev->priv;
+	tpri = (struct tuntap_data *) pri->user;
+	tpri->dev_name = init->dev_name;
+	tpri->fixed_config = (init->dev_name != NULL);
+	tpri->gate_addr = init->gate_addr;
+	tpri->fd = -1;
+	tpri->dev = dev;
+
+	printk("TUN/TAP backend - ");
+	if (tpri->gate_addr != NULL)
+		printk("IP = %s", tpri->gate_addr);
+	printk("\n");
+}
+
+static int tuntap_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_read(fd, (*skb)->mac.raw, 
+			(*skb)->dev->mtu + ETH_HEADER_OTHER));
+}
+
+static int tuntap_write(int fd, struct sk_buff **skb, 
+			struct uml_net_private *lp)
+{
+	return(net_write(fd, (*skb)->data, (*skb)->len));
+}
+
+struct net_kern_info tuntap_kern_info = {
+	.init			= tuntap_init,
+	.protocol		= eth_protocol,
+	.read			= tuntap_read,
+	.write 			= tuntap_write,
+};
+
+int tuntap_setup(char *str, char **mac_out, void *data)
+{
+	struct tuntap_init *init = data;
+
+	*init = ((struct tuntap_init)
+		{ .dev_name 	= NULL,
+		  .gate_addr 	= NULL });
+	if(tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
+			    &init->gate_addr))
+		return(0);
+
+	return(1);
+}
+
+static struct transport tuntap_transport = {
+	.list 		= LIST_HEAD_INIT(tuntap_transport.list),
+	.name 		= "tuntap",
+	.setup  	= tuntap_setup,
+	.user 		= &tuntap_user_info,
+	.kern 		= &tuntap_kern_info,
+	.private_size 	= sizeof(struct tuntap_data),
+	.setup_size 	= sizeof(struct tuntap_init),
+};
+
+static int register_tuntap(void)
+{
+	register_transport(&tuntap_transport);
+	return(1);
+}
+
+__initcall(register_tuntap);
+
+/*
+ * 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:
+ */
diff --git a/arch/um/os-Linux/drivers/tuntap_user.c b/arch/um/os-Linux/drivers/tuntap_user.c
new file mode 100644
index 000000000000..4b83c6c3f48d
--- /dev/null
+++ b/arch/um/os-Linux/drivers/tuntap_user.c
@@ -0,0 +1,225 @@
+/* 
+ * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include <stdio.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/uio.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <linux/if_tun.h>
+#include "net_user.h"
+#include "tuntap.h"
+#include "kern_util.h"
+#include "user_util.h"
+#include "user.h"
+#include "helper.h"
+#include "os.h"
+
+#define MAX_PACKET ETH_MAX_PACKET
+
+void tuntap_user_init(void *data, void *dev)
+{
+	struct tuntap_data *pri = data;
+
+	pri->dev = dev;
+}
+
+static void tuntap_add_addr(unsigned char *addr, unsigned char *netmask,
+			    void *data)
+{
+	struct tuntap_data *pri = data;
+
+	tap_check_ips(pri->gate_addr, addr);
+	if((pri->fd == -1) || pri->fixed_config) return;
+	open_addr(addr, netmask, pri->dev_name);
+}
+
+static void tuntap_del_addr(unsigned char *addr, unsigned char *netmask,
+			    void *data)
+{
+	struct tuntap_data *pri = data;
+
+	if((pri->fd == -1) || pri->fixed_config) return;
+	close_addr(addr, netmask, pri->dev_name);
+}
+
+struct tuntap_pre_exec_data {
+	int stdout;
+	int close_me;
+};
+
+static void tuntap_pre_exec(void *arg)
+{
+	struct tuntap_pre_exec_data *data = arg;
+	
+	dup2(data->stdout, 1);
+	os_close_file(data->close_me);
+}
+
+static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
+			     char *buffer, int buffer_len, int *used_out)
+{
+	struct tuntap_pre_exec_data data;
+	char version_buf[sizeof("nnnnn\0")];
+	char *argv[] = { "uml_net", version_buf, "tuntap", "up", gate,
+			 NULL };
+	char buf[CMSG_SPACE(sizeof(*fd_out))];
+	struct msghdr msg;
+	struct cmsghdr *cmsg;
+	struct iovec iov;
+	int pid, n;
+
+	sprintf(version_buf, "%d", UML_NET_VERSION);
+
+	data.stdout = remote;
+	data.close_me = me;
+
+	pid = run_helper(tuntap_pre_exec, &data, argv, NULL);
+
+	if(pid < 0) return(-pid);
+
+	os_close_file(remote);
+
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	if(buffer != NULL){
+		iov = ((struct iovec) { buffer, buffer_len });
+		msg.msg_iov = &iov;
+		msg.msg_iovlen = 1;
+	}
+	else {
+		msg.msg_iov = NULL;
+		msg.msg_iovlen = 0;
+	}
+	msg.msg_control = buf;
+	msg.msg_controllen = sizeof(buf);
+	msg.msg_flags = 0;
+	n = recvmsg(me, &msg, 0);
+	*used_out = n;
+	if(n < 0){
+		printk("tuntap_open_tramp : recvmsg failed - errno = %d\n", 
+		       errno);
+		return(-errno);
+	}
+	CATCH_EINTR(waitpid(pid, NULL, 0));
+
+	cmsg = CMSG_FIRSTHDR(&msg);
+	if(cmsg == NULL){
+		printk("tuntap_open_tramp : didn't receive a message\n");
+		return(-EINVAL);
+	}
+	if((cmsg->cmsg_level != SOL_SOCKET) || 
+	   (cmsg->cmsg_type != SCM_RIGHTS)){
+		printk("tuntap_open_tramp : didn't receive a descriptor\n");
+		return(-EINVAL);
+	}
+	*fd_out = ((int *) CMSG_DATA(cmsg))[0];
+	return(0);
+}
+
+static int tuntap_open(void *data)
+{
+	struct ifreq ifr;
+	struct tuntap_data *pri = data;
+	char *output, *buffer;
+	int err, fds[2], len, used;
+
+	err = tap_open_common(pri->dev, pri->gate_addr);
+	if(err < 0)
+		return(err);
+
+	if(pri->fixed_config){
+		pri->fd = os_open_file("/dev/net/tun", of_rdwr(OPENFLAGS()), 0);
+		if(pri->fd < 0){
+			printk("Failed to open /dev/net/tun, err = %d\n",
+			       -pri->fd);
+			return(pri->fd);
+		}
+		memset(&ifr, 0, sizeof(ifr));
+		ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+		strlcpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name));
+		if(ioctl(pri->fd, TUNSETIFF, (void *) &ifr) < 0){
+			printk("TUNSETIFF failed, errno = %d\n", errno);
+			os_close_file(pri->fd);
+			return(-errno);
+		}
+	}
+	else {
+		err = os_pipe(fds, 0, 0);
+		if(err < 0){
+			printk("tuntap_open : os_pipe failed - err = %d\n",
+			       -err);
+			return(err);
+		}
+
+		buffer = get_output_buffer(&len);
+		if(buffer != NULL) len--;
+		used = 0;
+
+		err = tuntap_open_tramp(pri->gate_addr, &pri->fd, fds[0],
+					fds[1], buffer, len, &used);
+
+		output = buffer;
+		if(err < 0) {
+			printk("%s", output);
+			free_output_buffer(buffer);
+			printk("tuntap_open_tramp failed - err = %d\n", -err);
+			return(err);
+		}
+
+		pri->dev_name = uml_strdup(buffer);
+		output += IFNAMSIZ;
+		printk("%s", output);
+		free_output_buffer(buffer);
+
+		os_close_file(fds[0]);
+		iter_addresses(pri->dev, open_addr, pri->dev_name);
+	}
+
+	return(pri->fd);
+}
+
+static void tuntap_close(int fd, void *data)
+{
+	struct tuntap_data *pri = data;
+
+	if(!pri->fixed_config) 
+		iter_addresses(pri->dev, close_addr, pri->dev_name);
+	os_close_file(fd);
+	pri->fd = -1;
+}
+
+static int tuntap_set_mtu(int mtu, void *data)
+{
+	return(mtu);
+}
+
+struct net_user_info tuntap_user_info = {
+	.init		= tuntap_user_init,
+	.open		= tuntap_open,
+	.close	 	= tuntap_close,
+	.remove	 	= NULL,
+	.set_mtu	= tuntap_set_mtu,
+	.add_address	= tuntap_add_addr,
+	.delete_address = tuntap_del_addr,
+	.max_packet	= MAX_PACKET
+};
+
+/*
+ * 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:
+ */