blob: 046a131f61046260c293e12111f30a53266084fd [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Jeff Dikecd1ae0e2007-10-16 01:27:29 -07002 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * James Leu (jleu@mindspring.net).
Jeff Dikecd1ae0e2007-10-16 01:27:29 -07004 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * Copyright (C) 2001 by various other people who didn't put their name here.
6 * Licensed under the GPL.
7 */
8
Jeff Dike5134d8f2008-02-08 04:22:08 -08009#include <linux/init.h>
Jeff Dikecd1ae0e2007-10-16 01:27:29 -070010#include <linux/netdevice.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include "etap.h"
Jeff Dikecd1ae0e2007-10-16 01:27:29 -070012#include "net_kern.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
14struct ethertap_init {
15 char *dev_name;
16 char *gate_addr;
17};
18
19static void etap_init(struct net_device *dev, void *data)
20{
21 struct uml_net_private *pri;
22 struct ethertap_data *epri;
23 struct ethertap_init *init = data;
24
25 pri = dev->priv;
26 epri = (struct ethertap_data *) pri->user;
27 epri->dev_name = init->dev_name;
28 epri->gate_addr = init->gate_addr;
29 epri->data_fd = -1;
30 epri->control_fd = -1;
31 epri->dev = dev;
32
Jeff Dike5134d8f2008-02-08 04:22:08 -080033 printk(KERN_INFO "ethertap backend - %s", epri->dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 if (epri->gate_addr != NULL)
Jeff Dike5134d8f2008-02-08 04:22:08 -080035 printk(KERN_CONT ", IP = %s", epri->gate_addr);
36 printk(KERN_CONT "\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070037}
38
Jeff Dikeb53f35a2007-10-16 01:27:31 -070039static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
41 int len;
42
Jeff Dikeb53f35a2007-10-16 01:27:31 -070043 len = net_recvfrom(fd, skb_mac_header(skb),
44 skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
Jeff Dikecd1ae0e2007-10-16 01:27:29 -070045 if (len <= 0)
Jeff Dikeb53f35a2007-10-16 01:27:31 -070046 return(len);
47
48 skb_pull(skb, 2);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 len -= 2;
Jeff Dikecd1ae0e2007-10-16 01:27:29 -070050 return len;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051}
52
Jeff Dikeb53f35a2007-10-16 01:27:31 -070053static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
Jeff Dikeb53f35a2007-10-16 01:27:31 -070055 skb_push(skb, 2);
56 return net_send(fd, skb->data, skb->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057}
58
Jeff Dike5e7672e2006-09-27 01:50:33 -070059const struct net_kern_info ethertap_kern_info = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 .init = etap_init,
61 .protocol = eth_protocol,
62 .read = etap_read,
63 .write = etap_write,
64};
65
66int ethertap_setup(char *str, char **mac_out, void *data)
67{
68 struct ethertap_init *init = data;
69
70 *init = ((struct ethertap_init)
71 { .dev_name = NULL,
72 .gate_addr = NULL });
Jeff Dikecd1ae0e2007-10-16 01:27:29 -070073 if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 &init->gate_addr))
Jeff Dikecd1ae0e2007-10-16 01:27:29 -070075 return 0;
76 if (init->dev_name == NULL) {
77 printk(KERN_ERR "ethertap_setup : Missing tap device name\n");
78 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 }
80
Jeff Dikecd1ae0e2007-10-16 01:27:29 -070081 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070082}
83
84static struct transport ethertap_transport = {
85 .list = LIST_HEAD_INIT(ethertap_transport.list),
86 .name = "ethertap",
87 .setup = ethertap_setup,
88 .user = &ethertap_user_info,
89 .kern = &ethertap_kern_info,
90 .private_size = sizeof(struct ethertap_data),
Jeff Dikeb53f35a2007-10-16 01:27:31 -070091 .setup_size = sizeof(struct ethertap_init),
Linus Torvalds1da177e2005-04-16 15:20:36 -070092};
93
94static int register_ethertap(void)
95{
96 register_transport(&ethertap_transport);
Jeff Dikef4c57a72006-03-31 02:30:10 -080097 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
Jeff Dike8210fd22006-12-06 20:34:55 -0800100late_initcall(register_ethertap);