2007-10-16 02:27:29 -06:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
|
|
* Licensed under the GPL.
|
|
|
|
*/
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include <unistd.h>
|
|
|
|
#include <errno.h>
|
2007-10-16 02:27:29 -06:00
|
|
|
#include <fcntl.h>
|
|
|
|
#include <string.h>
|
2005-04-16 16:20:36 -06:00
|
|
|
#include <sys/termios.h>
|
|
|
|
#include <sys/wait.h>
|
2007-10-16 02:27:29 -06:00
|
|
|
#include "kern_constants.h"
|
2005-04-16 16:20:36 -06:00
|
|
|
#include "net_user.h"
|
|
|
|
#include "os.h"
|
2007-10-16 02:27:29 -06:00
|
|
|
#include "slip.h"
|
2006-10-20 00:28:20 -06:00
|
|
|
#include "um_malloc.h"
|
2007-10-16 02:27:29 -06:00
|
|
|
#include "user.h"
|
2005-04-16 16:20:36 -06:00
|
|
|
|
uml: network interface hotplug error handling
This fixes a number of problems associated with network interface hotplug.
The userspace initialization function can fail in some cases, but the
failure was never passed back to eth_configure, which proceeded with the
configuration. This results in a zombie device that is present, but can't
work. This is fixed by allowing the initialization routines to return an
error, which is checked, and the configuration aborted on failure.
eth_configure failed to check for many failures. Even when it did check,
it didn't undo whatever initializations has already happened, so a present,
but partially initialized and non-working device could result. It now
checks everything that can fail, and bails out, undoing whatever had been
done.
The return value of eth_configure was always ignored, so it is now just
void.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-06 15:51:04 -06:00
|
|
|
static int slip_user_init(void *data, void *dev)
|
2005-04-16 16:20:36 -06:00
|
|
|
{
|
|
|
|
struct slip_data *pri = data;
|
|
|
|
|
|
|
|
pri->dev = dev;
|
uml: network interface hotplug error handling
This fixes a number of problems associated with network interface hotplug.
The userspace initialization function can fail in some cases, but the
failure was never passed back to eth_configure, which proceeded with the
configuration. This results in a zombie device that is present, but can't
work. This is fixed by allowing the initialization routines to return an
error, which is checked, and the configuration aborted on failure.
eth_configure failed to check for many failures. Even when it did check,
it didn't undo whatever initializations has already happened, so a present,
but partially initialized and non-working device could result. It now
checks everything that can fail, and bails out, undoing whatever had been
done.
The return value of eth_configure was always ignored, so it is now just
void.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-06 15:51:04 -06:00
|
|
|
return 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static int set_up_tty(int fd)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
struct termios tios;
|
|
|
|
|
|
|
|
if (tcgetattr(fd, &tios) < 0) {
|
2007-10-16 02:27:29 -06:00
|
|
|
printk(UM_KERN_ERR "could not get initial terminal "
|
|
|
|
"attributes\n");
|
|
|
|
return -1;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
|
|
|
|
tios.c_iflag = IGNBRK | IGNPAR;
|
|
|
|
tios.c_oflag = 0;
|
|
|
|
tios.c_lflag = 0;
|
|
|
|
for (i = 0; i < NCCS; i++)
|
|
|
|
tios.c_cc[i] = 0;
|
|
|
|
tios.c_cc[VMIN] = 1;
|
|
|
|
tios.c_cc[VTIME] = 0;
|
|
|
|
|
|
|
|
cfsetospeed(&tios, B38400);
|
|
|
|
cfsetispeed(&tios, B38400);
|
|
|
|
|
|
|
|
if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
|
2007-10-16 02:27:29 -06:00
|
|
|
printk(UM_KERN_ERR "failed to set terminal attributes\n");
|
|
|
|
return -1;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2007-10-16 02:27:29 -06:00
|
|
|
return 0;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
struct slip_pre_exec_data {
|
|
|
|
int stdin;
|
|
|
|
int stdout;
|
|
|
|
int close_me;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void slip_pre_exec(void *arg)
|
|
|
|
{
|
|
|
|
struct slip_pre_exec_data *data = arg;
|
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
if (data->stdin >= 0)
|
|
|
|
dup2(data->stdin, 0);
|
2005-04-16 16:20:36 -06:00
|
|
|
dup2(data->stdout, 1);
|
2007-10-16 02:27:29 -06:00
|
|
|
if (data->close_me >= 0)
|
|
|
|
close(data->close_me);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static int slip_tramp(char **argv, int fd)
|
|
|
|
{
|
|
|
|
struct slip_pre_exec_data pe_data;
|
|
|
|
char *output;
|
2007-12-17 17:19:46 -07:00
|
|
|
int pid, fds[2], err, output_len;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
err = os_pipe(fds, 1, 0);
|
2007-10-16 02:27:29 -06:00
|
|
|
if (err < 0) {
|
|
|
|
printk(UM_KERN_ERR "slip_tramp : pipe failed, err = %d\n",
|
|
|
|
-err);
|
2005-06-13 16:52:18 -06:00
|
|
|
goto out;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
err = 0;
|
|
|
|
pe_data.stdin = fd;
|
|
|
|
pe_data.stdout = fds[1];
|
|
|
|
pe_data.close_me = fds[0];
|
2007-07-16 00:38:56 -06:00
|
|
|
err = run_helper(slip_pre_exec, &pe_data, argv);
|
2007-10-16 02:27:29 -06:00
|
|
|
if (err < 0)
|
2005-06-13 16:52:18 -06:00
|
|
|
goto out_close;
|
|
|
|
pid = err;
|
|
|
|
|
2007-05-06 15:51:22 -06:00
|
|
|
output_len = UM_KERN_PAGE_SIZE;
|
2008-05-12 15:01:52 -06:00
|
|
|
output = uml_kmalloc(output_len, UM_GFP_KERNEL);
|
2007-10-16 02:27:29 -06:00
|
|
|
if (output == NULL) {
|
|
|
|
printk(UM_KERN_ERR "slip_tramp : failed to allocate output "
|
|
|
|
"buffer\n");
|
2005-06-13 16:52:18 -06:00
|
|
|
os_kill_process(pid, 1);
|
|
|
|
err = -ENOMEM;
|
|
|
|
goto out_free;
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
close(fds[1]);
|
2005-06-13 16:52:18 -06:00
|
|
|
read_output(fds[0], output, output_len);
|
|
|
|
printk("%s", output);
|
|
|
|
|
2008-02-04 23:31:10 -07:00
|
|
|
err = helper_wait(pid);
|
2007-10-16 02:27:29 -06:00
|
|
|
close(fds[0]);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
2005-06-13 16:52:18 -06:00
|
|
|
out_free:
|
|
|
|
kfree(output);
|
|
|
|
return err;
|
|
|
|
|
|
|
|
out_close:
|
2007-10-16 02:27:29 -06:00
|
|
|
close(fds[0]);
|
|
|
|
close(fds[1]);
|
2005-06-13 16:52:18 -06:00
|
|
|
out:
|
|
|
|
return err;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static int slip_open(void *data)
|
|
|
|
{
|
|
|
|
struct slip_data *pri = data;
|
|
|
|
char version_buf[sizeof("nnnnn\0")];
|
|
|
|
char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
|
2007-10-16 02:27:29 -06:00
|
|
|
char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
|
2005-04-16 16:20:36 -06:00
|
|
|
NULL };
|
|
|
|
int sfd, mfd, err;
|
|
|
|
|
2005-06-13 16:52:18 -06:00
|
|
|
err = get_pty();
|
2007-10-16 02:27:29 -06:00
|
|
|
if (err < 0) {
|
|
|
|
printk(UM_KERN_ERR "slip-open : Failed to open pty, err = %d\n",
|
|
|
|
-err);
|
2005-06-13 16:52:18 -06:00
|
|
|
goto out;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2005-06-13 16:52:18 -06:00
|
|
|
mfd = err;
|
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
err = open(ptsname(mfd), O_RDWR, 0);
|
|
|
|
if (err < 0) {
|
|
|
|
printk(UM_KERN_ERR "Couldn't open tty for slip line, "
|
|
|
|
"err = %d\n", -err);
|
2005-06-13 16:52:18 -06:00
|
|
|
goto out_close;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
2005-06-13 16:52:18 -06:00
|
|
|
sfd = err;
|
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
if (set_up_tty(sfd))
|
2005-06-13 16:52:18 -06:00
|
|
|
goto out_close2;
|
|
|
|
|
2005-04-16 16:20:36 -06:00
|
|
|
pri->slave = sfd;
|
2005-06-13 16:52:18 -06:00
|
|
|
pri->slip.pos = 0;
|
|
|
|
pri->slip.esc = 0;
|
2007-10-16 02:27:29 -06:00
|
|
|
if (pri->gate_addr != NULL) {
|
2005-04-16 16:20:36 -06:00
|
|
|
sprintf(version_buf, "%d", UML_NET_VERSION);
|
|
|
|
strcpy(gate_buf, pri->gate_addr);
|
|
|
|
|
|
|
|
err = slip_tramp(argv, sfd);
|
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
if (err < 0) {
|
|
|
|
printk(UM_KERN_ERR "slip_tramp failed - err = %d\n",
|
|
|
|
-err);
|
2005-06-13 16:52:18 -06:00
|
|
|
goto out_close2;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
err = os_get_ifname(pri->slave, pri->name);
|
2007-10-16 02:27:29 -06:00
|
|
|
if (err < 0) {
|
|
|
|
printk(UM_KERN_ERR "get_ifname failed, err = %d\n",
|
|
|
|
-err);
|
2005-06-13 16:52:18 -06:00
|
|
|
goto out_close2;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
iter_addresses(pri->dev, open_addr, pri->name);
|
|
|
|
}
|
|
|
|
else {
|
|
|
|
err = os_set_slip(sfd);
|
2007-10-16 02:27:29 -06:00
|
|
|
if (err < 0) {
|
|
|
|
printk(UM_KERN_ERR "Failed to set slip discipline "
|
|
|
|
"encapsulation - err = %d\n", -err);
|
2005-06-13 16:52:18 -06:00
|
|
|
goto out_close2;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
}
|
2007-10-16 02:27:29 -06:00
|
|
|
return mfd;
|
2005-06-13 16:52:18 -06:00
|
|
|
out_close2:
|
2007-10-16 02:27:29 -06:00
|
|
|
close(sfd);
|
2005-06-13 16:52:18 -06:00
|
|
|
out_close:
|
2007-10-16 02:27:29 -06:00
|
|
|
close(mfd);
|
2005-06-13 16:52:18 -06:00
|
|
|
out:
|
|
|
|
return err;
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static void slip_close(int fd, void *data)
|
|
|
|
{
|
|
|
|
struct slip_data *pri = data;
|
|
|
|
char version_buf[sizeof("nnnnn\0")];
|
2007-10-16 02:27:29 -06:00
|
|
|
char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name,
|
2005-04-16 16:20:36 -06:00
|
|
|
NULL };
|
|
|
|
int err;
|
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
if (pri->gate_addr != NULL)
|
2005-04-16 16:20:36 -06:00
|
|
|
iter_addresses(pri->dev, close_addr, pri->name);
|
|
|
|
|
|
|
|
sprintf(version_buf, "%d", UML_NET_VERSION);
|
|
|
|
|
|
|
|
err = slip_tramp(argv, pri->slave);
|
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
if (err != 0)
|
|
|
|
printk(UM_KERN_ERR "slip_tramp failed - errno = %d\n", -err);
|
|
|
|
close(fd);
|
|
|
|
close(pri->slave);
|
2005-04-16 16:20:36 -06:00
|
|
|
pri->slave = -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
|
|
|
|
{
|
2005-06-13 16:52:18 -06:00
|
|
|
return slip_proto_read(fd, buf, len, &pri->slip);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
|
|
|
|
{
|
2005-06-13 16:52:18 -06:00
|
|
|
return slip_proto_write(fd, buf, len, &pri->slip);
|
2005-04-16 16:20:36 -06:00
|
|
|
}
|
|
|
|
|
|
|
|
static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
struct slip_data *pri = data;
|
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
if (pri->slave < 0)
|
|
|
|
return;
|
2005-04-16 16:20:36 -06:00
|
|
|
open_addr(addr, netmask, pri->name);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
struct slip_data *pri = data;
|
|
|
|
|
2007-10-16 02:27:29 -06:00
|
|
|
if (pri->slave < 0)
|
|
|
|
return;
|
2005-04-16 16:20:36 -06:00
|
|
|
close_addr(addr, netmask, pri->name);
|
|
|
|
}
|
|
|
|
|
2006-09-27 02:50:33 -06:00
|
|
|
const struct net_user_info slip_user_info = {
|
2005-04-16 16:20:36 -06:00
|
|
|
.init = slip_user_init,
|
|
|
|
.open = slip_open,
|
|
|
|
.close = slip_close,
|
|
|
|
.remove = NULL,
|
|
|
|
.add_address = slip_add_addr,
|
|
|
|
.delete_address = slip_del_addr,
|
2007-10-16 02:27:31 -06:00
|
|
|
.mtu = BUF_SIZE,
|
|
|
|
.max_packet = BUF_SIZE,
|
2005-04-16 16:20:36 -06:00
|
|
|
};
|