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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slirp_kern.c (2661B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
      4 */
      5
      6#include <linux/if_arp.h>
      7#include <linux/init.h>
      8#include <linux/netdevice.h>
      9#include <linux/string.h>
     10#include <net_kern.h>
     11#include <net_user.h>
     12#include "slirp.h"
     13
     14struct slirp_init {
     15	struct arg_list_dummy_wrapper argw;  /* XXX should be simpler... */
     16};
     17
     18void slirp_init(struct net_device *dev, void *data)
     19{
     20	struct uml_net_private *private;
     21	struct slirp_data *spri;
     22	struct slirp_init *init = data;
     23	int i;
     24
     25	private = netdev_priv(dev);
     26	spri = (struct slirp_data *) private->user;
     27
     28	spri->argw = init->argw;
     29	spri->pid = -1;
     30	spri->slave = -1;
     31	spri->dev = dev;
     32
     33	slip_proto_init(&spri->slip);
     34
     35	dev->hard_header_len = 0;
     36	dev->header_ops = NULL;
     37	dev->addr_len = 0;
     38	dev->type = ARPHRD_SLIP;
     39	dev->tx_queue_len = 256;
     40	dev->flags = IFF_NOARP;
     41	printk("SLIRP backend - command line:");
     42	for (i = 0; spri->argw.argv[i] != NULL; i++)
     43		printk(" '%s'",spri->argw.argv[i]);
     44	printk("\n");
     45}
     46
     47static unsigned short slirp_protocol(struct sk_buff *skbuff)
     48{
     49	return htons(ETH_P_IP);
     50}
     51
     52static int slirp_read(int fd, struct sk_buff *skb, struct uml_net_private *lp)
     53{
     54	return slirp_user_read(fd, skb_mac_header(skb), skb->dev->mtu,
     55			       (struct slirp_data *) &lp->user);
     56}
     57
     58static int slirp_write(int fd, struct sk_buff *skb, struct uml_net_private *lp)
     59{
     60	return slirp_user_write(fd, skb->data, skb->len,
     61				(struct slirp_data *) &lp->user);
     62}
     63
     64const struct net_kern_info slirp_kern_info = {
     65	.init			= slirp_init,
     66	.protocol		= slirp_protocol,
     67	.read			= slirp_read,
     68	.write			= slirp_write,
     69};
     70
     71static int slirp_setup(char *str, char **mac_out, void *data)
     72{
     73	struct slirp_init *init = data;
     74	int i=0;
     75
     76	*init = ((struct slirp_init) { .argw = { { "slirp", NULL  } } });
     77
     78	str = split_if_spec(str, mac_out, NULL);
     79
     80	if (str == NULL) /* no command line given after MAC addr */
     81		return 1;
     82
     83	do {
     84		if (i >= SLIRP_MAX_ARGS - 1) {
     85			printk(KERN_WARNING "slirp_setup: truncating slirp "
     86			       "arguments\n");
     87			break;
     88		}
     89		init->argw.argv[i++] = str;
     90		while(*str && *str!=',') {
     91			if (*str == '_')
     92				*str=' ';
     93			str++;
     94		}
     95		if (*str != ',')
     96			break;
     97		*str++ = '\0';
     98	} while (1);
     99
    100	init->argw.argv[i] = NULL;
    101	return 1;
    102}
    103
    104static struct transport slirp_transport = {
    105	.list 		= LIST_HEAD_INIT(slirp_transport.list),
    106	.name 		= "slirp",
    107	.setup  	= slirp_setup,
    108	.user 		= &slirp_user_info,
    109	.kern 		= &slirp_kern_info,
    110	.private_size 	= sizeof(struct slirp_data),
    111	.setup_size 	= sizeof(struct slirp_init),
    112};
    113
    114static int register_slirp(void)
    115{
    116	register_transport(&slirp_transport);
    117	return 0;
    118}
    119
    120late_initcall(register_slirp);