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Commit | Line | Data |
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1da177e4 | 1 | /* |
cd1ae0e4 | 2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and |
1da177e4 | 3 | * James Leu (jleu@mindspring.net). |
cd1ae0e4 | 4 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
1da177e4 LT |
5 | * Copyright (C) 2001 by various other people who didn't put their name here. |
6 | * Licensed under the GPL. | |
7 | */ | |
8 | ||
9 | #include "linux/init.h" | |
cd1ae0e4 | 10 | #include <linux/netdevice.h> |
1da177e4 | 11 | #include "etap.h" |
cd1ae0e4 | 12 | #include "net_kern.h" |
1da177e4 LT |
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 | ||
33 | printk("ethertap backend - %s", epri->dev_name); | |
34 | if (epri->gate_addr != NULL) | |
35 | printk(", IP = %s", epri->gate_addr); | |
36 | printk("\n"); | |
37 | } | |
38 | ||
b53f35a8 | 39 | static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
1da177e4 LT |
40 | { |
41 | int len; | |
42 | ||
b53f35a8 JD |
43 | len = net_recvfrom(fd, skb_mac_header(skb), |
44 | skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP); | |
cd1ae0e4 | 45 | if (len <= 0) |
b53f35a8 JD |
46 | return(len); |
47 | ||
48 | skb_pull(skb, 2); | |
1da177e4 | 49 | len -= 2; |
cd1ae0e4 | 50 | return len; |
1da177e4 LT |
51 | } |
52 | ||
b53f35a8 | 53 | static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
1da177e4 | 54 | { |
b53f35a8 JD |
55 | skb_push(skb, 2); |
56 | return net_send(fd, skb->data, skb->len); | |
1da177e4 LT |
57 | } |
58 | ||
5e7672ec | 59 | const struct net_kern_info ethertap_kern_info = { |
1da177e4 LT |
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 }); | |
cd1ae0e4 | 73 | if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out, |
1da177e4 | 74 | &init->gate_addr)) |
cd1ae0e4 JD |
75 | return 0; |
76 | if (init->dev_name == NULL) { | |
77 | printk(KERN_ERR "ethertap_setup : Missing tap device name\n"); | |
78 | return 0; | |
1da177e4 LT |
79 | } |
80 | ||
cd1ae0e4 | 81 | return 1; |
1da177e4 LT |
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), | |
b53f35a8 | 91 | .setup_size = sizeof(struct ethertap_init), |
1da177e4 LT |
92 | }; |
93 | ||
94 | static int register_ethertap(void) | |
95 | { | |
96 | register_transport(ðertap_transport); | |
f4c57a78 | 97 | return 0; |
1da177e4 LT |
98 | } |
99 | ||
8210fd2a | 100 | late_initcall(register_ethertap); |