um: Kill directly reference of netdev->priv
[linux-2.6.git] / arch / um / os-Linux / drivers / tuntap_kern.c
1 /*
2  * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
3  * Licensed under the GPL
4  */
5
6 #include <linux/netdevice.h>
7 #include <linux/init.h>
8 #include <linux/skbuff.h>
9 #include <asm/errno.h>
10 #include "net_kern.h"
11 #include "tuntap.h"
12
13 struct tuntap_init {
14         char *dev_name;
15         char *gate_addr;
16 };
17
18 static void tuntap_init(struct net_device *dev, void *data)
19 {
20         struct uml_net_private *pri;
21         struct tuntap_data *tpri;
22         struct tuntap_init *init = data;
23
24         pri = netdev_priv(dev);
25         tpri = (struct tuntap_data *) pri->user;
26         tpri->dev_name = init->dev_name;
27         tpri->fixed_config = (init->dev_name != NULL);
28         tpri->gate_addr = init->gate_addr;
29         tpri->fd = -1;
30         tpri->dev = dev;
31
32         printk(KERN_INFO "TUN/TAP backend - ");
33         if (tpri->gate_addr != NULL)
34                 printk(KERN_CONT "IP = %s", tpri->gate_addr);
35         printk(KERN_CONT "\n");
36 }
37
38 static int tuntap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
39 {
40         return net_read(fd, skb_mac_header(skb),
41                         skb->dev->mtu + ETH_HEADER_OTHER);
42 }
43
44 static int tuntap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
45 {
46         return net_write(fd, skb->data, skb->len);
47 }
48
49 const struct net_kern_info tuntap_kern_info = {
50         .init                   = tuntap_init,
51         .protocol               = eth_protocol,
52         .read                   = tuntap_read,
53         .write                  = tuntap_write,
54 };
55
56 int tuntap_setup(char *str, char **mac_out, void *data)
57 {
58         struct tuntap_init *init = data;
59
60         *init = ((struct tuntap_init)
61                 { .dev_name     = NULL,
62                   .gate_addr    = NULL });
63         if (tap_setup_common(str, "tuntap", &init->dev_name, mac_out,
64                             &init->gate_addr))
65                 return 0;
66
67         return 1;
68 }
69
70 static struct transport tuntap_transport = {
71         .list           = LIST_HEAD_INIT(tuntap_transport.list),
72         .name           = "tuntap",
73         .setup          = tuntap_setup,
74         .user           = &tuntap_user_info,
75         .kern           = &tuntap_kern_info,
76         .private_size   = sizeof(struct tuntap_data),
77         .setup_size     = sizeof(struct tuntap_init),
78 };
79
80 static int register_tuntap(void)
81 {
82         register_transport(&tuntap_transport);
83         return 0;
84 }
85
86 late_initcall(register_tuntap);