Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and |
| 3 | * James Leu (jleu@mindspring.net). |
| 4 | * Copyright (C) 2001 by various other people who didn't put their name here. |
| 5 | * Licensed under the GPL. |
| 6 | */ |
| 7 | |
| 8 | #include "linux/init.h" |
| 9 | #include "linux/netdevice.h" |
| 10 | #include "linux/etherdevice.h" |
| 11 | #include "net_kern.h" |
| 12 | #include "net_user.h" |
| 13 | #include "etap.h" |
| 14 | |
| 15 | struct ethertap_init { |
| 16 | char *dev_name; |
| 17 | char *gate_addr; |
| 18 | }; |
| 19 | |
| 20 | static void etap_init(struct net_device *dev, void *data) |
| 21 | { |
| 22 | struct uml_net_private *pri; |
| 23 | struct ethertap_data *epri; |
| 24 | struct ethertap_init *init = data; |
| 25 | |
| 26 | pri = dev->priv; |
| 27 | epri = (struct ethertap_data *) pri->user; |
| 28 | epri->dev_name = init->dev_name; |
| 29 | epri->gate_addr = init->gate_addr; |
| 30 | epri->data_fd = -1; |
| 31 | epri->control_fd = -1; |
| 32 | epri->dev = dev; |
| 33 | |
| 34 | printk("ethertap backend - %s", epri->dev_name); |
| 35 | if (epri->gate_addr != NULL) |
| 36 | printk(", IP = %s", epri->gate_addr); |
| 37 | printk("\n"); |
| 38 | } |
| 39 | |
| 40 | static int etap_read(int fd, struct sk_buff **skb, struct uml_net_private *lp) |
| 41 | { |
| 42 | int len; |
| 43 | |
| 44 | *skb = ether_adjust_skb(*skb, ETH_HEADER_ETHERTAP); |
| 45 | if(*skb == NULL) return(-ENOMEM); |
| 46 | len = net_recvfrom(fd, (*skb)->mac.raw, |
| 47 | (*skb)->dev->mtu + 2 * ETH_HEADER_ETHERTAP); |
| 48 | if(len <= 0) return(len); |
| 49 | skb_pull(*skb, 2); |
| 50 | len -= 2; |
| 51 | return(len); |
| 52 | } |
| 53 | |
| 54 | static int etap_write(int fd, struct sk_buff **skb, struct uml_net_private *lp) |
| 55 | { |
| 56 | if(skb_headroom(*skb) < 2){ |
| 57 | struct sk_buff *skb2; |
| 58 | |
| 59 | skb2 = skb_realloc_headroom(*skb, 2); |
| 60 | dev_kfree_skb(*skb); |
| 61 | if (skb2 == NULL) return(-ENOMEM); |
| 62 | *skb = skb2; |
| 63 | } |
| 64 | skb_push(*skb, 2); |
| 65 | return(net_send(fd, (*skb)->data, (*skb)->len)); |
| 66 | } |
| 67 | |
| 68 | struct net_kern_info ethertap_kern_info = { |
| 69 | .init = etap_init, |
| 70 | .protocol = eth_protocol, |
| 71 | .read = etap_read, |
| 72 | .write = etap_write, |
| 73 | }; |
| 74 | |
| 75 | int ethertap_setup(char *str, char **mac_out, void *data) |
| 76 | { |
| 77 | struct ethertap_init *init = data; |
| 78 | |
| 79 | *init = ((struct ethertap_init) |
| 80 | { .dev_name = NULL, |
| 81 | .gate_addr = NULL }); |
| 82 | if(tap_setup_common(str, "ethertap", &init->dev_name, mac_out, |
| 83 | &init->gate_addr)) |
| 84 | return(0); |
| 85 | if(init->dev_name == NULL){ |
| 86 | printk("ethertap_setup : Missing tap device name\n"); |
| 87 | return(0); |
| 88 | } |
| 89 | |
| 90 | return(1); |
| 91 | } |
| 92 | |
| 93 | static struct transport ethertap_transport = { |
| 94 | .list = LIST_HEAD_INIT(ethertap_transport.list), |
| 95 | .name = "ethertap", |
| 96 | .setup = ethertap_setup, |
| 97 | .user = ðertap_user_info, |
| 98 | .kern = ðertap_kern_info, |
| 99 | .private_size = sizeof(struct ethertap_data), |
| 100 | }; |
| 101 | |
| 102 | static int register_ethertap(void) |
| 103 | { |
| 104 | register_transport(ðertap_transport); |
| 105 | return(1); |
| 106 | } |
| 107 | |
| 108 | __initcall(register_ethertap); |
| 109 | |
| 110 | /* |
| 111 | * Overrides for Emacs so that we follow Linus's tabbing style. |
| 112 | * Emacs will notice this stuff at the end of the file and automatically |
| 113 | * adjust the settings for this buffer only. This must remain at the end |
| 114 | * of the file. |
| 115 | * --------------------------------------------------------------------------- |
| 116 | * Local variables: |
| 117 | * c-file-style: "linux" |
| 118 | * End: |
| 119 | */ |