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100 lines
2.3 KiB
100 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2001 Lennert Buytenhek ([email protected]) and |
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* James Leu ([email protected]). |
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* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
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* Copyright (C) 2001 by various other people who didn't put their name here. |
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*/ |
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#include <linux/init.h> |
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#include <linux/netdevice.h> |
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#include "etap.h" |
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#include <net_kern.h> |
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struct ethertap_init { |
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char *dev_name; |
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char *gate_addr; |
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}; |
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static void etap_init(struct net_device *dev, void *data) |
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{ |
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struct uml_net_private *pri; |
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struct ethertap_data *epri; |
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struct ethertap_init *init = data; |
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pri = netdev_priv(dev); |
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epri = (struct ethertap_data *) pri->user; |
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epri->dev_name = init->dev_name; |
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epri->gate_addr = init->gate_addr; |
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epri->data_fd = -1; |
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epri->control_fd = -1; |
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epri->dev = dev; |
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printk(KERN_INFO "ethertap backend - %s", epri->dev_name); |
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if (epri->gate_addr != NULL) |
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printk(KERN_CONT ", IP = %s", epri->gate_addr); |
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printk(KERN_CONT "\n"); |
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} |
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static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
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{ |
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int len; |
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len = net_recvfrom(fd, skb_mac_header(skb), |
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skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP); |
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if (len <= 0) |
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return(len); |
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skb_pull(skb, 2); |
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len -= 2; |
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return len; |
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} |
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static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) |
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{ |
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skb_push(skb, 2); |
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return net_send(fd, skb->data, skb->len); |
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} |
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const struct net_kern_info ethertap_kern_info = { |
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.init = etap_init, |
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.protocol = eth_protocol, |
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.read = etap_read, |
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.write = etap_write, |
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}; |
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int ethertap_setup(char *str, char **mac_out, void *data) |
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{ |
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struct ethertap_init *init = data; |
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*init = ((struct ethertap_init) |
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{ .dev_name = NULL, |
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.gate_addr = NULL }); |
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if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out, |
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&init->gate_addr)) |
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return 0; |
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if (init->dev_name == NULL) { |
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printk(KERN_ERR "ethertap_setup : Missing tap device name\n"); |
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return 0; |
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} |
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return 1; |
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} |
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static struct transport ethertap_transport = { |
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.list = LIST_HEAD_INIT(ethertap_transport.list), |
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.name = "ethertap", |
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.setup = ethertap_setup, |
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.user = ðertap_user_info, |
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.kern = ðertap_kern_info, |
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.private_size = sizeof(struct ethertap_data), |
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.setup_size = sizeof(struct ethertap_init), |
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}; |
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static int register_ethertap(void) |
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{ |
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register_transport(ðertap_transport); |
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return 0; |
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} |
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late_initcall(register_ethertap);
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