217 lines
4.7 KiB
C
217 lines
4.7 KiB
C
/*
|
|
* Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
* Licensed under the GPL
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <linux/if_tun.h>
|
|
#include <net/if.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/uio.h>
|
|
#include "kern_constants.h"
|
|
#include "os.h"
|
|
#include "tuntap.h"
|
|
#include "user.h"
|
|
|
|
static int tuntap_user_init(void *data, void *dev)
|
|
{
|
|
struct tuntap_data *pri = data;
|
|
|
|
pri->dev = dev;
|
|
return 0;
|
|
}
|
|
|
|
static void tuntap_add_addr(unsigned char *addr, unsigned char *netmask,
|
|
void *data)
|
|
{
|
|
struct tuntap_data *pri = data;
|
|
|
|
tap_check_ips(pri->gate_addr, addr);
|
|
if ((pri->fd == -1) || pri->fixed_config)
|
|
return;
|
|
open_addr(addr, netmask, pri->dev_name);
|
|
}
|
|
|
|
static void tuntap_del_addr(unsigned char *addr, unsigned char *netmask,
|
|
void *data)
|
|
{
|
|
struct tuntap_data *pri = data;
|
|
|
|
if ((pri->fd == -1) || pri->fixed_config)
|
|
return;
|
|
close_addr(addr, netmask, pri->dev_name);
|
|
}
|
|
|
|
struct tuntap_pre_exec_data {
|
|
int stdout;
|
|
int close_me;
|
|
};
|
|
|
|
static void tuntap_pre_exec(void *arg)
|
|
{
|
|
struct tuntap_pre_exec_data *data = arg;
|
|
|
|
dup2(data->stdout, 1);
|
|
close(data->close_me);
|
|
}
|
|
|
|
static int tuntap_open_tramp(char *gate, int *fd_out, int me, int remote,
|
|
char *buffer, int buffer_len, int *used_out)
|
|
{
|
|
struct tuntap_pre_exec_data data;
|
|
char version_buf[sizeof("nnnnn\0")];
|
|
char *argv[] = { "uml_net", version_buf, "tuntap", "up", gate,
|
|
NULL };
|
|
char buf[CMSG_SPACE(sizeof(*fd_out))];
|
|
struct msghdr msg;
|
|
struct cmsghdr *cmsg;
|
|
struct iovec iov;
|
|
int pid, n, err;
|
|
|
|
sprintf(version_buf, "%d", UML_NET_VERSION);
|
|
|
|
data.stdout = remote;
|
|
data.close_me = me;
|
|
|
|
pid = run_helper(tuntap_pre_exec, &data, argv);
|
|
|
|
if (pid < 0)
|
|
return -pid;
|
|
|
|
close(remote);
|
|
|
|
msg.msg_name = NULL;
|
|
msg.msg_namelen = 0;
|
|
if (buffer != NULL) {
|
|
iov = ((struct iovec) { buffer, buffer_len });
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
}
|
|
else {
|
|
msg.msg_iov = NULL;
|
|
msg.msg_iovlen = 0;
|
|
}
|
|
msg.msg_control = buf;
|
|
msg.msg_controllen = sizeof(buf);
|
|
msg.msg_flags = 0;
|
|
n = recvmsg(me, &msg, 0);
|
|
*used_out = n;
|
|
if (n < 0) {
|
|
err = -errno;
|
|
printk(UM_KERN_ERR "tuntap_open_tramp : recvmsg failed - "
|
|
"errno = %d\n", errno);
|
|
return err;
|
|
}
|
|
CATCH_EINTR(waitpid(pid, NULL, 0));
|
|
|
|
cmsg = CMSG_FIRSTHDR(&msg);
|
|
if (cmsg == NULL) {
|
|
printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a "
|
|
"message\n");
|
|
return -EINVAL;
|
|
}
|
|
if ((cmsg->cmsg_level != SOL_SOCKET) ||
|
|
(cmsg->cmsg_type != SCM_RIGHTS)) {
|
|
printk(UM_KERN_ERR "tuntap_open_tramp : didn't receive a "
|
|
"descriptor\n");
|
|
return -EINVAL;
|
|
}
|
|
*fd_out = ((int *) CMSG_DATA(cmsg))[0];
|
|
os_set_exec_close(*fd_out);
|
|
return 0;
|
|
}
|
|
|
|
static int tuntap_open(void *data)
|
|
{
|
|
struct ifreq ifr;
|
|
struct tuntap_data *pri = data;
|
|
char *output, *buffer;
|
|
int err, fds[2], len, used;
|
|
|
|
err = tap_open_common(pri->dev, pri->gate_addr);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (pri->fixed_config) {
|
|
pri->fd = os_open_file("/dev/net/tun",
|
|
of_cloexec(of_rdwr(OPENFLAGS())), 0);
|
|
if (pri->fd < 0) {
|
|
printk(UM_KERN_ERR "Failed to open /dev/net/tun, "
|
|
"err = %d\n", -pri->fd);
|
|
return pri->fd;
|
|
}
|
|
memset(&ifr, 0, sizeof(ifr));
|
|
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
|
|
strlcpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name));
|
|
if (ioctl(pri->fd, TUNSETIFF, (void *) &ifr) < 0) {
|
|
err = -errno;
|
|
printk(UM_KERN_ERR "TUNSETIFF failed, errno = %d\n",
|
|
errno);
|
|
close(pri->fd);
|
|
return err;
|
|
}
|
|
}
|
|
else {
|
|
err = socketpair(AF_UNIX, SOCK_DGRAM, 0, fds);
|
|
if (err) {
|
|
err = -errno;
|
|
printk(UM_KERN_ERR "tuntap_open : socketpair failed - "
|
|
"errno = %d\n", errno);
|
|
return err;
|
|
}
|
|
|
|
buffer = get_output_buffer(&len);
|
|
if (buffer != NULL)
|
|
len--;
|
|
used = 0;
|
|
|
|
err = tuntap_open_tramp(pri->gate_addr, &pri->fd, fds[0],
|
|
fds[1], buffer, len, &used);
|
|
|
|
output = buffer;
|
|
if (err < 0) {
|
|
printk("%s", output);
|
|
free_output_buffer(buffer);
|
|
printk(UM_KERN_ERR "tuntap_open_tramp failed - "
|
|
"err = %d\n", -err);
|
|
return err;
|
|
}
|
|
|
|
pri->dev_name = uml_strdup(buffer);
|
|
output += IFNAMSIZ;
|
|
printk("%s", output);
|
|
free_output_buffer(buffer);
|
|
|
|
close(fds[0]);
|
|
iter_addresses(pri->dev, open_addr, pri->dev_name);
|
|
}
|
|
|
|
return pri->fd;
|
|
}
|
|
|
|
static void tuntap_close(int fd, void *data)
|
|
{
|
|
struct tuntap_data *pri = data;
|
|
|
|
if (!pri->fixed_config)
|
|
iter_addresses(pri->dev, close_addr, pri->dev_name);
|
|
close(fd);
|
|
pri->fd = -1;
|
|
}
|
|
|
|
const struct net_user_info tuntap_user_info = {
|
|
.init = tuntap_user_init,
|
|
.open = tuntap_open,
|
|
.close = tuntap_close,
|
|
.remove = NULL,
|
|
.add_address = tuntap_add_addr,
|
|
.delete_address = tuntap_del_addr,
|
|
.mtu = ETH_MAX_PACKET,
|
|
.max_packet = ETH_MAX_PACKET + ETH_HEADER_OTHER,
|
|
};
|