6 files changed, 166 insertions, 184 deletions

diff --git a/arch/um/os-Linux/drivers/etap.h b/arch/um/os-Linux/drivers/etap.h
index 57ecdaf2f67e..ddffd41c3f3f 100644
--- a/arch/um/os-Linux/drivers/etap.h
+++ b/arch/um/os-Linux/drivers/etap.h
@@ -1,8 +1,11 @@
 /* 
- * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
+#ifndef __DRIVERS_ETAP_H
+#define __DRIVERS_ETAP_H
+
 #include "net_user.h"
 
 struct ethertap_data {
@@ -15,13 +18,4 @@ struct ethertap_data {
 
 extern const 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:
- */
+#endif
diff --git a/arch/um/os-Linux/drivers/ethertap_kern.c b/arch/um/os-Linux/drivers/ethertap_kern.c
index 12689141414d..04f11b9f1ac0 100644
--- a/arch/um/os-Linux/drivers/ethertap_kern.c
+++ b/arch/um/os-Linux/drivers/ethertap_kern.c
@@ -1,16 +1,15 @@
 /*
- * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and 
+ * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
  * James Leu (jleu@mindspring.net).
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * 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 <linux/netdevice.h>
 #include "etap.h"
+#include "net_kern.h"
 
 struct ethertap_init {
 	char *dev_name;
@@ -37,32 +36,24 @@ static void etap_init(struct net_device *dev, void *data)
 	printk("\n");
 }
 
-static int etap_read(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+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_header(*skb),
-			   (*skb)->dev->mtu + 2 * ETH_HEADER_ETHERTAP);
-	if(len <= 0) return(len);
-	skb_pull(*skb, 2);
+	len = net_recvfrom(fd, skb_mac_header(skb),
+			   skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
+	if (len <= 0)
+		return(len);
+
+	skb_pull(skb, 2);
 	len -= 2;
-	return(len);
+	return len;
 }
 
-static int etap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp)
+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));
+	skb_push(skb, 2);
+	return net_send(fd, skb->data, skb->len);
 }
 
 const struct net_kern_info ethertap_kern_info = {
@@ -79,15 +70,15 @@ int ethertap_setup(char *str, char **mac_out, void *data)
 	*init = ((struct ethertap_init)
 		{ .dev_name 	= NULL,
 		  .gate_addr 	= NULL });
-	if(tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
+	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 0;
+	if (init->dev_name == NULL) {
+		printk(KERN_ERR "ethertap_setup : Missing tap device name\n");
+		return 0;
 	}
 
-	return(1);
+	return 1;
 }
 
 static struct transport ethertap_transport = {
@@ -97,6 +88,7 @@ static struct transport ethertap_transport = {
 	.user 		= &ethertap_user_info,
 	.kern 		= &ethertap_kern_info,
 	.private_size 	= sizeof(struct ethertap_data),
+	.setup_size 	= sizeof(struct ethertap_init),
 };
 
 static int register_ethertap(void)
diff --git a/arch/um/os-Linux/drivers/ethertap_user.c b/arch/um/os-Linux/drivers/ethertap_user.c
index 61d3953c7ac9..4ff553603449 100644
--- a/arch/um/os-Linux/drivers/ethertap_user.c
+++ b/arch/um/os-Linux/drivers/ethertap_user.c
@@ -1,4 +1,5 @@
 /*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * 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.
@@ -7,20 +8,16 @@
 
 #include <stdio.h>
 #include <unistd.h>
-#include <stddef.h>
-#include <stdlib.h>
-#include <sys/errno.h>
+#include <errno.h>
+#include <string.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 "net_user.h"
 #include "etap.h"
+#include "kern_constants.h"
 #include "os.h"
+#include "net_user.h"
 #include "um_malloc.h"
-#include "kern_constants.h"
+#include "user.h"
 
 #define MAX_PACKET ETH_MAX_PACKET
 
@@ -49,16 +46,18 @@ static void etap_change(int op, unsigned char *addr, unsigned char *netmask,
 	memcpy(change.addr, addr, sizeof(change.addr));
 	memcpy(change.netmask, netmask, sizeof(change.netmask));
 	CATCH_EINTR(n = write(fd, &change, sizeof(change)));
-	if(n != sizeof(change)){
-		printk("etap_change - request failed, err = %d\n", errno);
+	if (n != sizeof(change)) {
+		printk(UM_KERN_ERR "etap_change - request failed, err = %d\n",
+		       errno);
 		return;
 	}
 
 	output = kmalloc(UM_KERN_PAGE_SIZE, UM_GFP_KERNEL);
-	if(output == NULL)
-		printk("etap_change : Failed to allocate output buffer\n");
+	if (output == NULL)
+		printk(UM_KERN_ERR "etap_change : Failed to allocate output "
+		       "buffer\n");
 	read_output(fd, output, UM_KERN_PAGE_SIZE);
-	if(output != NULL){
+	if (output != NULL) {
 		printk("%s", output);
 		kfree(output);
 	}
@@ -87,11 +86,11 @@ 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);
+	close(data->data_me);
+	close(data->control_me);
 }
 
-static int etap_tramp(char *dev, char *gate, int 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;
@@ -101,13 +100,13 @@ static int etap_tramp(char *dev, char *gate, int control_me,
 	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", 
+	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){
+	if (gate != NULL) {
 		strcpy(gate_buf, gate);
 		args = setup_args;
 	}
@@ -119,24 +118,26 @@ static int etap_tramp(char *dev, char *gate, int control_me,
 	pe_data.data_me = data_me;
 	pid = run_helper(etap_pre_exec, &pe_data, args);
 
-	if(pid < 0)
+	if (pid < 0)
 		err = pid;
-	os_close_file(data_remote);
-	os_close_file(control_remote);
+	close(data_remote);
+	close(control_remote);
 	CATCH_EINTR(n = read(control_me, &c, sizeof(c)));
-	if(n != sizeof(c)){
+	if (n != sizeof(c)) {
 		err = -errno;
-		printk("etap_tramp : read of status failed, err = %d\n", -err);
+		printk(UM_KERN_ERR "etap_tramp : read of status failed, "
+		       "err = %d\n", -err);
 		return err;
 	}
-	if(c != 1){
-		printk("etap_tramp : uml_net failed\n");
+	if (c != 1) {
+		printk(UM_KERN_ERR "etap_tramp : uml_net failed\n");
 		err = -EINVAL;
 		CATCH_EINTR(n = waitpid(pid, &status, 0));
-		if(n < 0)
+		if (n < 0)
 			err = -errno;
-		else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 1))
-			printk("uml_net didn't exit with status 1\n");
+		else if (!WIFEXITED(status) || (WEXITSTATUS(status) != 1))
+			printk(UM_KERN_ERR "uml_net didn't exit with "
+			       "status 1\n");
 	}
 	return err;
 }
@@ -148,43 +149,56 @@ static int etap_open(void *data)
 	int data_fds[2], control_fds[2], err, output_len;
 
 	err = tap_open_common(pri->dev, pri->gate_addr);
-	if(err)
+	if (err)
 		return err;
 
-	err = os_pipe(data_fds, 0, 0);
-	if(err < 0){
-		printk("data os_pipe failed - err = %d\n", -err);
+	err = socketpair(AF_UNIX, SOCK_DGRAM, 0, data_fds);
+	if (err) {
+		err = -errno;
+		printk(UM_KERN_ERR "etap_open - data socketpair failed - "
+		       "err = %d\n", errno);
 		return err;
 	}
 
-	err = os_pipe(control_fds, 1, 0);
-	if(err < 0){
-		printk("control os_pipe failed - err = %d\n", -err);
-		return err;
+	err = socketpair(AF_UNIX, SOCK_STREAM, 0, control_fds);
+	if (err) {
+		err = -errno;
+		printk(UM_KERN_ERR "etap_open - control socketpair failed - "
+		       "err = %d\n", errno);
+		goto out_close_data;
 	}
 
-	err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0], 
+	err = etap_tramp(pri->dev_name, pri->gate_addr, control_fds[0],
 			 control_fds[1], data_fds[0], data_fds[1]);
 	output_len = UM_KERN_PAGE_SIZE;
 	output = kmalloc(output_len, UM_GFP_KERNEL);
 	read_output(control_fds[0], output, output_len);
 
-	if(output == NULL)
-		printk("etap_open : failed to allocate output buffer\n");
+	if (output == NULL)
+		printk(UM_KERN_ERR "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;
+	if (err < 0) {
+		printk(UM_KERN_ERR "etap_tramp failed - err = %d\n", -err);
+		goto out_close_control;
 	}
 
 	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];
+
+out_close_control:
+	close(control_fds[0]);
+	close(control_fds[1]);
+out_close_data:
+	close(data_fds[0]);
+	close(data_fds[1]);
+	return err;
 }
 
 static void etap_close(int fd, void *data)
@@ -192,37 +206,41 @@ 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);
+	close(fd);
+
+	if (shutdown(pri->data_fd, SHUT_RDWR) < 0)
+		printk(UM_KERN_ERR "etap_close - shutdown data socket failed, "
+		       "errno = %d\n", errno);
+
+	if (shutdown(pri->control_fd, SHUT_RDWR) < 0)
+		printk(UM_KERN_ERR "etap_close - shutdown control socket "
+		       "failed, errno = %d\n", errno);
+
+	close(pri->data_fd);
 	pri->data_fd = -1;
-	os_close_file(pri->control_fd);
+	close(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)
+	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, 
+static void etap_del_addr(unsigned char *addr, unsigned char *netmask,
 			  void *data)
 {
 	struct ethertap_data *pri = data;
 
-	if(pri->control_fd == -1)
+	if (pri->control_fd == -1)
 		return;
+
 	etap_close_addr(addr, netmask, &pri->control_fd);
 }
 
@@ -231,8 +249,8 @@ const struct net_user_info ethertap_user_info = {
 	.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
+	.mtu		= ETH_MAX_PACKET,
+	.max_packet	= ETH_MAX_PACKET + ETH_HEADER_ETHERTAP,
 };
diff --git a/arch/um/os-Linux/drivers/tuntap.h b/arch/um/os-Linux/drivers/tuntap.h
index d3e8d3af6245..f17c31586c84 100644
--- a/arch/um/os-Linux/drivers/tuntap.h
+++ b/arch/um/os-Linux/drivers/tuntap.h
@@ -1,5 +1,5 @@
 /* 
- * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
  * Licensed under the GPL
  */
 
@@ -19,14 +19,3 @@ struct tuntap_data {
 extern const 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
index f1714e7fb1d0..9d384807b077 100644
--- a/arch/um/os-Linux/drivers/tuntap_kern.c
+++ b/arch/um/os-Linux/drivers/tuntap_kern.c
@@ -1,16 +1,13 @@
-/* 
- * Copyright (C) 2001 Jeff Dike (jdike@karaya.com)
+/*
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.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 <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/skbuff.h>
+#include <asm/errno.h>
 #include "net_kern.h"
-#include "net_user.h"
 #include "tuntap.h"
 
 struct tuntap_init {
@@ -38,19 +35,15 @@ static void tuntap_init(struct net_device *dev, void *data)
 	printk("\n");
 }
 
-static int tuntap_read(int fd, struct sk_buff **skb, 
-		       struct uml_net_private *lp)
+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_header(*skb),
-			(*skb)->dev->mtu + ETH_HEADER_OTHER));
+	return net_read(fd, skb_mac_header(skb),
+			skb->dev->mtu + ETH_HEADER_OTHER);
 }
 
-static int tuntap_write(int fd, struct sk_buff **skb, 
-			struct uml_net_private *lp)
+static int tuntap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
 {
-	return(net_write(fd, (*skb)->data, (*skb)->len));
+	return net_write(fd, skb->data, skb->len);
 }
 
 const struct net_kern_info tuntap_kern_info = {
@@ -67,11 +60,11 @@ int tuntap_setup(char *str, char **mac_out, void *data)
 	*init = ((struct tuntap_init)
 		{ .dev_name 	= NULL,
 		  .gate_addr 	= NULL });
-	if(tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
+	if (tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
 			    &init->gate_addr))
-		return(0);
+		return 0;
 
-	return(1);
+	return 1;
 }
 
 static struct transport tuntap_transport = {
diff --git a/arch/um/os-Linux/drivers/tuntap_user.c b/arch/um/os-Linux/drivers/tuntap_user.c
index f848b4ea9343..6c55d3c8ead8 100644
--- a/arch/um/os-Linux/drivers/tuntap_user.c
+++ b/arch/um/os-Linux/drivers/tuntap_user.c
@@ -1,27 +1,22 @@
 /* 
- * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.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 <string.h>
+#include <linux/if_tun.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
 #include <sys/socket.h>
-#include <sys/un.h>
+#include <sys/wait.h>
 #include <sys/uio.h>
-#include <sys/ioctl.h>
-#include <net/if.h>
-#include <linux/if_tun.h>
-#include "net_user.h"
+#include "kern_constants.h"
+#include "os.h"
 #include "tuntap.h"
-#include "kern_util.h"
 #include "user.h"
-#include "os.h"
-
-#define MAX_PACKET ETH_MAX_PACKET
 
 static int tuntap_user_init(void *data, void *dev)
 {
@@ -37,7 +32,7 @@ static void tuntap_add_addr(unsigned char *addr, unsigned char *netmask,
 	struct tuntap_data *pri = data;
 
 	tap_check_ips(pri->gate_addr, addr);
-	if((pri->fd == -1) || pri->fixed_config)
+	if ((pri->fd == -1) || pri->fixed_config)
 		return;
 	open_addr(addr, netmask, pri->dev_name);
 }
@@ -47,7 +42,7 @@ static void tuntap_del_addr(unsigned char *addr, unsigned char *netmask,
 {
 	struct tuntap_data *pri = data;
 
-	if((pri->fd == -1) || pri->fixed_config)
+	if ((pri->fd == -1) || pri->fixed_config)
 		return;
 	close_addr(addr, netmask, pri->dev_name);
 }
@@ -62,7 +57,7 @@ static void tuntap_pre_exec(void *arg)
 	struct tuntap_pre_exec_data *data = arg;
 
 	dup2(data->stdout, 1);
-	os_close_file(data->close_me);
+	close(data->close_me);
 }
 
 static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
@@ -85,14 +80,14 @@ static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
 
 	pid = run_helper(tuntap_pre_exec, &data, argv);
 
-	if(pid < 0)
+	if (pid < 0)
 		return -pid;
 
-	os_close_file(remote);
+	close(remote);
 
 	msg.msg_name = NULL;
 	msg.msg_namelen = 0;
-	if(buffer != NULL){
+	if (buffer != NULL) {
 		iov = ((struct iovec) { buffer, buffer_len });
 		msg.msg_iov = &iov;
 		msg.msg_iovlen = 1;
@@ -106,26 +101,28 @@ static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
 	msg.msg_flags = 0;
 	n = recvmsg(me, &msg, 0);
 	*used_out = n;
-	if(n < 0){
+	if (n < 0) {
 		err = -errno;
-		printk("tuntap_open_tramp : recvmsg failed - errno = %d\n", 
-		       errno);
+		printk(UM_KERN_ERR "tuntap_open_tramp : recvmsg failed - "
+		       "errno = %d\n", errno);
 		return err;
 	}
 	CATCH_EINTR(waitpid(pid, NULL, 0));
 
 	cmsg = CMSG_FIRSTHDR(&msg);
-	if(cmsg == NULL){
-		printk("tuntap_open_tramp : didn't receive a message\n");
+	if (cmsg == NULL) {
+		printk(UM_KERN_ERR "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");
+	if ((cmsg->cmsg_level != SOL_SOCKET) ||
+	   (cmsg->cmsg_type != SCM_RIGHTS)) {
+		printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a "
+		       "descriptor\n");
 		return -EINVAL;
 	}
 	*fd_out = ((int *) CMSG_DATA(cmsg))[0];
-	os_set_exec_close(*fd_out, 1);
+	os_set_exec_close(*fd_out);
 	return 0;
 }
 
@@ -137,47 +134,51 @@ static int tuntap_open(void *data)
 	int err, fds[2], len, used;
 
 	err = tap_open_common(pri->dev, pri->gate_addr);
-	if(err < 0)
+	if (err < 0)
 		return err;
 
-	if(pri->fixed_config){
+	if (pri->fixed_config) {
 		pri->fd = os_open_file("/dev/net/tun",
 				       of_cloexec(of_rdwr(OPENFLAGS())), 0);
-		if(pri->fd < 0){
-			printk("Failed to open /dev/net/tun, err = %d\n",
-			       -pri->fd);
+		if (pri->fd < 0) {
+			printk(UM_KERN_ERR "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){
+		if (ioctl(pri->fd, TUNSETIFF, (void *) &ifr) < 0) {
 			err = -errno;
-			printk("TUNSETIFF failed, errno = %d\n", errno);
-			os_close_file(pri->fd);
+			printk(UM_KERN_ERR "TUNSETIFF failed, errno = %d\n",
+			       errno);
+			close(pri->fd);
 			return err;
 		}
 	}
 	else {
-		err = os_pipe(fds, 0, 0);
-		if(err < 0){
-			printk("tuntap_open : os_pipe failed - err = %d\n",
-			       -err);
+		err = socketpair(AF_UNIX, SOCK_DGRAM, 0, fds);
+		if (err) {
+			err = -errno;
+			printk(UM_KERN_ERR "tuntap_open : socketpair failed - "
+			       "errno = %d\n", errno);
 			return err;
 		}
 
 		buffer = get_output_buffer(&len);
-		if(buffer != NULL) 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) {
+		if (err < 0) {
 			printk("%s", output);
 			free_output_buffer(buffer);
-			printk("tuntap_open_tramp failed - err = %d\n", -err);
+			printk(UM_KERN_ERR "tuntap_open_tramp failed - "
+			       "err = %d\n", -err);
 			return err;
 		}
 
@@ -186,7 +187,7 @@ static int tuntap_open(void *data)
 		printk("%s", output);
 		free_output_buffer(buffer);
 
-		os_close_file(fds[0]);
+		close(fds[0]);
 		iter_addresses(pri->dev, open_addr, pri->dev_name);
 	}
 
@@ -197,24 +198,19 @@ static void tuntap_close(int fd, void *data)
 {
 	struct tuntap_data *pri = data;
 
-	if(!pri->fixed_config) 
+	if (!pri->fixed_config)
 		iter_addresses(pri->dev, close_addr, pri->dev_name);
-	os_close_file(fd);
+	close(fd);
 	pri->fd = -1;
 }
 
-static int tuntap_set_mtu(int mtu, void *data)
-{
-	return mtu;
-}
-
 const 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
+	.mtu		= ETH_MAX_PACKET,
+	.max_packet	= ETH_MAX_PACKET + ETH_HEADER_OTHER,
 };