Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Jeff Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * James Leu (jleu@mindspring.net). |
Jeff Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 4 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Copyright (C) 2001 by various other people who didn't put their name here. |
| 6 | * Licensed under the GPL. |
| 7 | */ |
| 8 | |
Jeff Dike | 5134d8f | 2008-02-08 04:22:08 -0800 | [diff] [blame] | 9 | #include <linux/init.h> |
Jeff Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 10 | #include <linux/netdevice.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include "etap.h" |
Jeff Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 12 | #include "net_kern.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | |
| 14 | struct ethertap_init { |
| 15 | char *dev_name; |
| 16 | char *gate_addr; |
| 17 | }; |
| 18 | |
| 19 | static 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 Dike | 5134d8f | 2008-02-08 04:22:08 -0800 | [diff] [blame] | 33 | printk(KERN_INFO "ethertap backend - %s", epri->dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | if (epri->gate_addr != NULL) |
Jeff Dike | 5134d8f | 2008-02-08 04:22:08 -0800 | [diff] [blame] | 35 | printk(KERN_CONT ", IP = %s", epri->gate_addr); |
| 36 | printk(KERN_CONT "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | } |
| 38 | |
Jeff Dike | b53f35a | 2007-10-16 01:27:31 -0700 | [diff] [blame] | 39 | static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | { |
| 41 | int len; |
| 42 | |
Jeff Dike | b53f35a | 2007-10-16 01:27:31 -0700 | [diff] [blame] | 43 | len = net_recvfrom(fd, skb_mac_header(skb), |
| 44 | skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP); |
Jeff Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 45 | if (len <= 0) |
Jeff Dike | b53f35a | 2007-10-16 01:27:31 -0700 | [diff] [blame] | 46 | return(len); |
| 47 | |
| 48 | skb_pull(skb, 2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | len -= 2; |
Jeff Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 50 | return len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | } |
| 52 | |
Jeff Dike | b53f35a | 2007-10-16 01:27:31 -0700 | [diff] [blame] | 53 | static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
Jeff Dike | b53f35a | 2007-10-16 01:27:31 -0700 | [diff] [blame] | 55 | skb_push(skb, 2); |
| 56 | return net_send(fd, skb->data, skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | } |
| 58 | |
Jeff Dike | 5e7672e | 2006-09-27 01:50:33 -0700 | [diff] [blame] | 59 | const struct net_kern_info ethertap_kern_info = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | .init = etap_init, |
| 61 | .protocol = eth_protocol, |
| 62 | .read = etap_read, |
| 63 | .write = etap_write, |
| 64 | }; |
| 65 | |
| 66 | int 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 Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 73 | if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | &init->gate_addr)) |
Jeff Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 75 | return 0; |
| 76 | if (init->dev_name == NULL) { |
| 77 | printk(KERN_ERR "ethertap_setup : Missing tap device name\n"); |
| 78 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | } |
| 80 | |
Jeff Dike | cd1ae0e | 2007-10-16 01:27:29 -0700 | [diff] [blame] | 81 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | } |
| 83 | |
| 84 | static struct transport ethertap_transport = { |
| 85 | .list = LIST_HEAD_INIT(ethertap_transport.list), |
| 86 | .name = "ethertap", |
| 87 | .setup = ethertap_setup, |
| 88 | .user = ðertap_user_info, |
| 89 | .kern = ðertap_kern_info, |
| 90 | .private_size = sizeof(struct ethertap_data), |
Jeff Dike | b53f35a | 2007-10-16 01:27:31 -0700 | [diff] [blame] | 91 | .setup_size = sizeof(struct ethertap_init), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | }; |
| 93 | |
| 94 | static int register_ethertap(void) |
| 95 | { |
| 96 | register_transport(ðertap_transport); |
Jeff Dike | f4c57a7 | 2006-03-31 02:30:10 -0800 | [diff] [blame] | 97 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Jeff Dike | 8210fd2 | 2006-12-06 20:34:55 -0800 | [diff] [blame] | 100 | late_initcall(register_ethertap); |