cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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vde_kern.c (3099B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2007 Luca Bigliardi (shammash@artha.org).
      4 *
      5 * Transport usage:
      6 *  ethN=vde,<vde_switch>,<mac addr>,<port>,<group>,<mode>,<description>
      7 *
      8 */
      9
     10#include <linux/init.h>
     11#include <linux/netdevice.h>
     12#include <net_kern.h>
     13#include <net_user.h>
     14#include "vde.h"
     15
     16static void vde_init(struct net_device *dev, void *data)
     17{
     18	struct vde_init *init = data;
     19	struct uml_net_private *pri;
     20	struct vde_data *vpri;
     21
     22	pri = netdev_priv(dev);
     23	vpri = (struct vde_data *) pri->user;
     24
     25	vpri->vde_switch = init->vde_switch;
     26	vpri->descr = init->descr ? init->descr : "UML vde_transport";
     27	vpri->args = NULL;
     28	vpri->conn = NULL;
     29	vpri->dev = dev;
     30
     31	printk("vde backend - %s, ", vpri->vde_switch ?
     32	       vpri->vde_switch : "(default socket)");
     33
     34	vde_init_libstuff(vpri, init);
     35
     36	printk("\n");
     37}
     38
     39static int vde_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
     40{
     41	struct vde_data *pri = (struct vde_data *) &lp->user;
     42
     43	if (pri->conn != NULL)
     44		return vde_user_read(pri->conn, skb_mac_header(skb),
     45				     skb->dev->mtu + ETH_HEADER_OTHER);
     46
     47	printk(KERN_ERR "vde_read - we have no VDECONN to read from");
     48	return -EBADF;
     49}
     50
     51static int vde_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
     52{
     53	struct vde_data *pri = (struct vde_data *) &lp->user;
     54
     55	if (pri->conn != NULL)
     56		return vde_user_write((void *)pri->conn, skb->data,
     57				      skb->len);
     58
     59	printk(KERN_ERR "vde_write - we have no VDECONN to write to");
     60	return -EBADF;
     61}
     62
     63static const struct net_kern_info vde_kern_info = {
     64	.init			= vde_init,
     65	.protocol		= eth_protocol,
     66	.read			= vde_read,
     67	.write			= vde_write,
     68};
     69
     70static int vde_setup(char *str, char **mac_out, void *data)
     71{
     72	struct vde_init *init = data;
     73	char *remain, *port_str = NULL, *mode_str = NULL, *last;
     74
     75	*init = ((struct vde_init)
     76		{ .vde_switch		= NULL,
     77		  .descr		= NULL,
     78		  .port			= 0,
     79		  .group		= NULL,
     80		  .mode			= 0 });
     81
     82	remain = split_if_spec(str, &init->vde_switch, mac_out, &port_str,
     83				&init->group, &mode_str, &init->descr, NULL);
     84
     85	if (remain != NULL)
     86		printk(KERN_WARNING "vde_setup - Ignoring extra data :"
     87		       "'%s'\n", remain);
     88
     89	if (port_str != NULL) {
     90		init->port = simple_strtoul(port_str, &last, 10);
     91		if ((*last != '\0') || (last == port_str)) {
     92			printk(KERN_ERR "vde_setup - Bad port : '%s'\n",
     93						port_str);
     94			return 0;
     95		}
     96	}
     97
     98	if (mode_str != NULL) {
     99		init->mode = simple_strtoul(mode_str, &last, 8);
    100		if ((*last != '\0') || (last == mode_str)) {
    101			printk(KERN_ERR "vde_setup - Bad mode : '%s'\n",
    102						mode_str);
    103			return 0;
    104		}
    105	}
    106
    107	printk(KERN_INFO "Configured vde device: %s\n", init->vde_switch ?
    108	       init->vde_switch : "(default socket)");
    109
    110	return 1;
    111}
    112
    113static struct transport vde_transport = {
    114	.list 		= LIST_HEAD_INIT(vde_transport.list),
    115	.name 		= "vde",
    116	.setup  	= vde_setup,
    117	.user 		= &vde_user_info,
    118	.kern 		= &vde_kern_info,
    119	.private_size 	= sizeof(struct vde_data),
    120	.setup_size 	= sizeof(struct vde_init),
    121};
    122
    123static int register_vde(void)
    124{
    125	register_transport(&vde_transport);
    126	return 0;
    127}
    128
    129late_initcall(register_vde);