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_user.c (2254B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
      4 */
      5
      6#include <unistd.h>
      7#include <errno.h>
      8#include <string.h>
      9#include <sys/wait.h>
     10#include <net_user.h>
     11#include <os.h>
     12#include "slirp.h"
     13
     14static int slirp_user_init(void *data, void *dev)
     15{
     16	struct slirp_data *pri = data;
     17
     18	pri->dev = dev;
     19	return 0;
     20}
     21
     22struct slirp_pre_exec_data {
     23	int stdin_fd;
     24	int stdout_fd;
     25};
     26
     27static void slirp_pre_exec(void *arg)
     28{
     29	struct slirp_pre_exec_data *data = arg;
     30
     31	if (data->stdin_fd != -1)
     32		dup2(data->stdin_fd, 0);
     33	if (data->stdout_fd != -1)
     34		dup2(data->stdout_fd, 1);
     35}
     36
     37static int slirp_tramp(char **argv, int fd)
     38{
     39	struct slirp_pre_exec_data pe_data;
     40	int pid;
     41
     42	pe_data.stdin_fd = fd;
     43	pe_data.stdout_fd = fd;
     44	pid = run_helper(slirp_pre_exec, &pe_data, argv);
     45
     46	return pid;
     47}
     48
     49static int slirp_open(void *data)
     50{
     51	struct slirp_data *pri = data;
     52	int fds[2], pid, err;
     53
     54	err = os_pipe(fds, 1, 1);
     55	if (err)
     56		return err;
     57
     58	err = slirp_tramp(pri->argw.argv, fds[1]);
     59	if (err < 0) {
     60		printk(UM_KERN_ERR "slirp_tramp failed - errno = %d\n", -err);
     61		goto out;
     62	}
     63	pid = err;
     64
     65	pri->slave = fds[1];
     66	pri->slip.pos = 0;
     67	pri->slip.esc = 0;
     68	pri->pid = err;
     69
     70	return fds[0];
     71out:
     72	close(fds[0]);
     73	close(fds[1]);
     74	return err;
     75}
     76
     77static void slirp_close(int fd, void *data)
     78{
     79	struct slirp_data *pri = data;
     80	int err;
     81
     82	close(fd);
     83	close(pri->slave);
     84
     85	pri->slave = -1;
     86
     87	if (pri->pid<1) {
     88		printk(UM_KERN_ERR "slirp_close: no child process to shut "
     89		       "down\n");
     90		return;
     91	}
     92
     93#if 0
     94	if (kill(pri->pid, SIGHUP)<0) {
     95		printk(UM_KERN_ERR "slirp_close: sending hangup to %d failed "
     96		       "(%d)\n", pri->pid, errno);
     97	}
     98#endif
     99	err = helper_wait(pri->pid);
    100	if (err < 0)
    101		return;
    102
    103	pri->pid = -1;
    104}
    105
    106int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
    107{
    108	return slip_proto_read(fd, buf, len, &pri->slip);
    109}
    110
    111int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
    112{
    113	return slip_proto_write(fd, buf, len, &pri->slip);
    114}
    115
    116const struct net_user_info slirp_user_info = {
    117	.init		= slirp_user_init,
    118	.open		= slirp_open,
    119	.close	 	= slirp_close,
    120	.remove	 	= NULL,
    121	.add_address	= NULL,
    122	.delete_address = NULL,
    123	.mtu		= BUF_SIZE,
    124	.max_packet	= BUF_SIZE,
    125};