The definition of TUNSETIF is:
#define TUNSETIFF _IOW('T', 202, int)
indicating the argument is an "int" rather than a "struct ifreq*". This
trickery (as I understand it) would work on 32-bit systems, but not
64-bit.
The .../arch/sparc64/kernel/ioctl32.c translation for this ioctl is
"COMPATIBLE_IOCTL" which would be correct if an int was really expected,
but is not correct when a struct ifreq* is passed. There are already
translations in ioctl32.c to deal with an argument of type struct
ifreq*, so you might wish to take a look at them and change the
COMPATIBLE_IOCTL entry to an appropriate HANDLE_IOCTL entry. Take a
look at dev_ifsioc() for starters.
I've cc'd the ultralinux list, which is more appropriate for this matter.
E
Erwann Abalea wrote:
Hello,
I wanted to install OpenVPN on my firewall machine (an Ultra1 running
2.4.18), but unfortunately, I failed.
I managed to track the failing code, and tried to find equivalent
known-to-be-good code (found in the Linux Kernel documentation, in
networking/tuntap.txt).
The following code fails:
-----
int tun_alloc(char *dev)
{
struct ifreq ifr;
int fd, err;
if ((fd = open("/dev/net/tun", O_RDWR)) < 0)
{
perror("Unable to open /dev/net/tun");
return -1;
}
memset(&ifr, 0, sizeof(ifr));
/* Flags: IFF_TUN - TUN device (no Ethernet headers)
* IFF_TAP - TAP device
* IFF_NO_PI - Do not provide packet information
*/
ifr.ifr_flags = IFF_TUN;
if (*dev)
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
if ((err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0)
{
close(fd);
perror("ioctl(fd, TUNSETIFF, ...) error");
return err;
}
strcpy(dev, ifr.ifr_name);
return fd;
}
-----
I tested this in a small program (just add a main() asking for an
argument, and call the tun_alloc() with the given argument). It fails on 2
ultrasparc machines (an U1 and an U2 running the same kernel version, the
U1 also has the IPVS patch applied), and works on a standard PC also
running the 2.4.18 kernel. Tun/Tap support is compiled in (if it wasn't,
the failure would have been at the open() call).
What I get is:
-----
Opening tun0
ioctl(fd, TUNSETIFF, ...) error: : Invalid argument
-----
I also get something in my syslog.log file:
Jan 30 15:15:39 herisson kernel: sys32_ioctl(tun:4329): Unknown cmd fd(3)
cmd(800454ca) arg(effffc70)
What am I doing wrong?
