cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

ethertap_kern.c (2382B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and
      4 * James Leu (jleu@mindspring.net).
      5 * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
      6 * Copyright (C) 2001 by various other people who didn't put their name here.
      7 */
      8
      9#include <linux/init.h>
     10#include <linux/netdevice.h>
     11#include "etap.h"
     12#include <net_kern.h>
     13
     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 = netdev_priv(dev);
     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(KERN_INFO "ethertap backend - %s", epri->dev_name);
     34	if (epri->gate_addr != NULL)
     35		printk(KERN_CONT ", IP = %s", epri->gate_addr);
     36	printk(KERN_CONT "\n");
     37}
     38
     39static int etap_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
     40{
     41	int len;
     42
     43	len = net_recvfrom(fd, skb_mac_header(skb),
     44			   skb->dev->mtu + 2 + ETH_HEADER_ETHERTAP);
     45	if (len <= 0)
     46		return(len);
     47
     48	skb_pull(skb, 2);
     49	len -= 2;
     50	return len;
     51}
     52
     53static int etap_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
     54{
     55	skb_push(skb, 2);
     56	return net_send(fd, skb->data, skb->len);
     57}
     58
     59const struct net_kern_info ethertap_kern_info = {
     60	.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 });
     73	if (tap_setup_common(str, "ethertap", &init->dev_name, mac_out,
     74			    &init->gate_addr))
     75		return 0;
     76	if (init->dev_name == NULL) {
     77		printk(KERN_ERR "ethertap_setup : Missing tap device name\n");
     78		return 0;
     79	}
     80
     81	return 1;
     82}
     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),
     91	.setup_size 	= sizeof(struct ethertap_init),
     92};
     93
     94static int register_ethertap(void)
     95{
     96	register_transport(&ethertap_transport);
     97	return 0;
     98}
     99
    100late_initcall(register_ethertap);