2005-04-16 15:20:36 -07:00
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <stddef.h>
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#include <sched.h>
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#include <string.h>
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#include <errno.h>
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#include <sys/termios.h>
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#include <sys/wait.h>
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#include <sys/signal.h>
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#include "kern_util.h"
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#include "user.h"
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#include "net_user.h"
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#include "slip.h"
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2005-06-13 15:52:18 -07:00
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#include "slip_common.h"
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2005-04-16 15:20:36 -07:00
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#include "os.h"
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2006-10-19 23:28:20 -07:00
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#include "um_malloc.h"
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2007-05-06 14:51:22 -07:00
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#include "kern_constants.h"
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2005-04-16 15:20:36 -07:00
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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 14:51:04 -07:00
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static int slip_user_init(void *data, void *dev)
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2005-04-16 15:20:36 -07:00
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{
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struct slip_data *pri = data;
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pri->dev = dev;
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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 14:51:04 -07:00
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return 0;
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2005-04-16 15:20:36 -07:00
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}
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static int set_up_tty(int fd)
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{
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int i;
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struct termios tios;
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if (tcgetattr(fd, &tios) < 0) {
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printk("could not get initial terminal attributes\n");
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return(-1);
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}
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tios.c_cflag = CS8 | CREAD | HUPCL | CLOCAL;
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tios.c_iflag = IGNBRK | IGNPAR;
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tios.c_oflag = 0;
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tios.c_lflag = 0;
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for (i = 0; i < NCCS; i++)
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tios.c_cc[i] = 0;
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tios.c_cc[VMIN] = 1;
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tios.c_cc[VTIME] = 0;
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cfsetospeed(&tios, B38400);
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cfsetispeed(&tios, B38400);
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if (tcsetattr(fd, TCSAFLUSH, &tios) < 0) {
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printk("failed to set terminal attributes\n");
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return(-1);
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}
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return(0);
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}
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struct slip_pre_exec_data {
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int stdin;
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int stdout;
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int close_me;
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};
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static void slip_pre_exec(void *arg)
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{
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struct slip_pre_exec_data *data = arg;
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if(data->stdin >= 0) dup2(data->stdin, 0);
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dup2(data->stdout, 1);
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if(data->close_me >= 0) os_close_file(data->close_me);
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}
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static int slip_tramp(char **argv, int fd)
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{
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struct slip_pre_exec_data pe_data;
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char *output;
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int status, pid, fds[2], err, output_len;
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err = os_pipe(fds, 1, 0);
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if(err < 0){
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printk("slip_tramp : pipe failed, err = %d\n", -err);
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2005-06-13 15:52:18 -07:00
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goto out;
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2005-04-16 15:20:36 -07:00
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}
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err = 0;
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pe_data.stdin = fd;
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pe_data.stdout = fds[1];
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pe_data.close_me = fds[0];
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2005-06-13 15:52:18 -07:00
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err = run_helper(slip_pre_exec, &pe_data, argv, NULL);
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if(err < 0)
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goto out_close;
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pid = err;
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2007-05-06 14:51:22 -07:00
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output_len = UM_KERN_PAGE_SIZE;
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2005-06-13 15:52:18 -07:00
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output = um_kmalloc(output_len);
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if(output == NULL){
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printk("slip_tramp : failed to allocate output buffer\n");
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os_kill_process(pid, 1);
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err = -ENOMEM;
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goto out_free;
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}
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2005-04-16 15:20:36 -07:00
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2005-06-13 15:52:18 -07:00
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os_close_file(fds[1]);
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read_output(fds[0], output, output_len);
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printk("%s", output);
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CATCH_EINTR(err = waitpid(pid, &status, 0));
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if(err < 0)
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err = errno;
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else if(!WIFEXITED(status) || (WEXITSTATUS(status) != 0)){
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printk("'%s' didn't exit with status 0\n", argv[0]);
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err = -EINVAL;
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2005-04-16 15:20:36 -07:00
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}
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2005-06-13 15:52:18 -07:00
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else err = 0;
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2005-04-16 15:20:36 -07:00
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os_close_file(fds[0]);
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2005-06-13 15:52:18 -07:00
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out_free:
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kfree(output);
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return err;
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out_close:
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os_close_file(fds[0]);
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os_close_file(fds[1]);
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out:
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return err;
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2005-04-16 15:20:36 -07:00
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}
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static int slip_open(void *data)
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{
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struct slip_data *pri = data;
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char version_buf[sizeof("nnnnn\0")];
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char gate_buf[sizeof("nnn.nnn.nnn.nnn\0")];
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char *argv[] = { "uml_net", version_buf, "slip", "up", gate_buf,
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NULL };
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int sfd, mfd, err;
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2005-06-13 15:52:18 -07:00
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err = get_pty();
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if(err < 0){
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printk("slip-open : Failed to open pty, err = %d\n", -err);
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goto out;
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2005-04-16 15:20:36 -07:00
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}
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2005-06-13 15:52:18 -07:00
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mfd = err;
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err = os_open_file(ptsname(mfd), of_rdwr(OPENFLAGS()), 0);
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if(err < 0){
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printk("Couldn't open tty for slip line, err = %d\n", -err);
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goto out_close;
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2005-04-16 15:20:36 -07:00
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}
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2005-06-13 15:52:18 -07:00
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sfd = err;
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if(set_up_tty(sfd))
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goto out_close2;
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2005-04-16 15:20:36 -07:00
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pri->slave = sfd;
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2005-06-13 15:52:18 -07:00
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pri->slip.pos = 0;
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pri->slip.esc = 0;
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2005-04-16 15:20:36 -07:00
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if(pri->gate_addr != NULL){
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sprintf(version_buf, "%d", UML_NET_VERSION);
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strcpy(gate_buf, pri->gate_addr);
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err = slip_tramp(argv, sfd);
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if(err < 0){
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printk("slip_tramp failed - err = %d\n", -err);
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2005-06-13 15:52:18 -07:00
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goto out_close2;
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2005-04-16 15:20:36 -07:00
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}
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err = os_get_ifname(pri->slave, pri->name);
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if(err < 0){
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printk("get_ifname failed, err = %d\n", -err);
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2005-06-13 15:52:18 -07:00
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goto out_close2;
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2005-04-16 15:20:36 -07:00
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}
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iter_addresses(pri->dev, open_addr, pri->name);
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}
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else {
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err = os_set_slip(sfd);
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if(err < 0){
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printk("Failed to set slip discipline encapsulation - "
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"err = %d\n", -err);
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2005-06-13 15:52:18 -07:00
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goto out_close2;
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2005-04-16 15:20:36 -07:00
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}
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}
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return(mfd);
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2005-06-13 15:52:18 -07:00
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out_close2:
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os_close_file(sfd);
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out_close:
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os_close_file(mfd);
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out:
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return err;
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2005-04-16 15:20:36 -07:00
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}
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static void slip_close(int fd, void *data)
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{
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struct slip_data *pri = data;
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char version_buf[sizeof("nnnnn\0")];
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char *argv[] = { "uml_net", version_buf, "slip", "down", pri->name,
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NULL };
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int err;
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if(pri->gate_addr != NULL)
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iter_addresses(pri->dev, close_addr, pri->name);
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sprintf(version_buf, "%d", UML_NET_VERSION);
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err = slip_tramp(argv, pri->slave);
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if(err != 0)
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printk("slip_tramp failed - errno = %d\n", -err);
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os_close_file(fd);
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os_close_file(pri->slave);
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pri->slave = -1;
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}
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int slip_user_read(int fd, void *buf, int len, struct slip_data *pri)
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{
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2005-06-13 15:52:18 -07:00
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return slip_proto_read(fd, buf, len, &pri->slip);
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2005-04-16 15:20:36 -07:00
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}
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int slip_user_write(int fd, void *buf, int len, struct slip_data *pri)
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{
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2005-06-13 15:52:18 -07:00
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return slip_proto_write(fd, buf, len, &pri->slip);
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2005-04-16 15:20:36 -07:00
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}
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static int slip_set_mtu(int mtu, void *data)
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{
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return(mtu);
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}
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static void slip_add_addr(unsigned char *addr, unsigned char *netmask,
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void *data)
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{
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struct slip_data *pri = data;
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if(pri->slave < 0) return;
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open_addr(addr, netmask, pri->name);
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}
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static void slip_del_addr(unsigned char *addr, unsigned char *netmask,
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void *data)
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{
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struct slip_data *pri = data;
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if(pri->slave < 0) return;
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close_addr(addr, netmask, pri->name);
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}
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2006-09-27 01:50:33 -07:00
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const struct net_user_info slip_user_info = {
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2005-04-16 15:20:36 -07:00
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.init = slip_user_init,
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.open = slip_open,
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.close = slip_close,
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.remove = NULL,
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.set_mtu = slip_set_mtu,
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.add_address = slip_add_addr,
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.delete_address = slip_del_addr,
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.max_packet = BUF_SIZE
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};
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