aboutsummaryrefslogtreecommitdiff
path: root/net/atm/resources.c
diff options
context:
space:
mode:
authorDavid Woodhouse <David.Woodhouse@intel.com>2008-12-03 22:12:38 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-03 22:12:38 -0800
commit8865c418caf4e9dd2c24bdfae3a5a4106e143e60 (patch)
tree4d7fac2c74af56c6aaf83b324b349b76c5f949d9 /net/atm/resources.c
parentdcd39c90290297f6e6ed8a04bb20da7ac2b043c5 (diff)
downloadlinux-8865c418caf4e9dd2c24bdfae3a5a4106e143e60.tar.gz
atm: 32-bit ioctl compatibility
We lack compat ioctl support through most of the ATM code. This patch deals with most of it, and I can now at least use BR2684 and PPPoATM with 32-bit userspace. I haven't added a .compat_ioctl method to struct atm_ioctl, because AFAICT none of the current users need any conversion -- so we can just call the ->ioctl() method in every case. I looked at br2684, clip, lec, mpc, pppoatm and atmtcp. In svc_compat_ioctl() the only mangling which is needed is to change COMPAT_ATM_ADDPARTY to ATM_ADDPARTY. Although it's defined as _IOW('a', ATMIOC_SPECIAL+4,struct atm_iobuf) it doesn't actually _take_ a struct atm_iobuf as an argument -- it takes a struct sockaddr_atmsvc, which _is_ the same between 32-bit and 64-bit code, so doesn't need conversion. Almost all of vcc_ioctl() would have been identical, so I converted that into a core do_vcc_ioctl() function with an 'int compat' argument. I've done the same with atm_dev_ioctl(), where there _are_ a few differences, but still it's relatively contained and there would otherwise have been a lot of duplication. I haven't done any of the actual device-specific ioctls, although I've added a compat_ioctl method to struct atmdev_ops. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/atm/resources.c')
-rw-r--r--net/atm/resources.c88
1 files changed, 68 insertions, 20 deletions
diff --git a/net/atm/resources.c b/net/atm/resources.c
index a34ba948af9..56b7322ff46 100644
--- a/net/atm/resources.c
+++ b/net/atm/resources.c
@@ -195,20 +195,39 @@ static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg, in
}
-int atm_dev_ioctl(unsigned int cmd, void __user *arg)
+int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
{
void __user *buf;
int error, len, number, size = 0;
struct atm_dev *dev;
struct list_head *p;
int *tmp_buf, *tmp_p;
- struct atm_iobuf __user *iobuf = arg;
- struct atmif_sioc __user *sioc = arg;
+ int __user *sioc_len;
+ int __user *iobuf_len;
+
+#ifndef CONFIG_COMPAT
+ compat = 0; /* Just so the compiler _knows_ */
+#endif
+
switch (cmd) {
case ATM_GETNAMES:
- if (get_user(buf, &iobuf->buffer))
- return -EFAULT;
- if (get_user(len, &iobuf->length))
+
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ struct compat_atm_iobuf __user *ciobuf = arg;
+ compat_uptr_t cbuf;
+ iobuf_len = &ciobuf->length;
+ if (get_user(cbuf, &ciobuf->buffer))
+ return -EFAULT;
+ buf = compat_ptr(cbuf);
+#endif
+ } else {
+ struct atm_iobuf __user *iobuf = arg;
+ iobuf_len = &iobuf->length;
+ if (get_user(buf, &iobuf->buffer))
+ return -EFAULT;
+ }
+ if (get_user(len, iobuf_len))
return -EFAULT;
mutex_lock(&atm_dev_mutex);
list_for_each(p, &atm_devs)
@@ -229,7 +248,7 @@ int atm_dev_ioctl(unsigned int cmd, void __user *arg)
}
mutex_unlock(&atm_dev_mutex);
error = ((copy_to_user(buf, tmp_buf, size)) ||
- put_user(size, &iobuf->length))
+ put_user(size, iobuf_len))
? -EFAULT : 0;
kfree(tmp_buf);
return error;
@@ -237,13 +256,32 @@ int atm_dev_ioctl(unsigned int cmd, void __user *arg)
break;
}
- if (get_user(buf, &sioc->arg))
- return -EFAULT;
- if (get_user(len, &sioc->length))
- return -EFAULT;
- if (get_user(number, &sioc->number))
- return -EFAULT;
-
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ struct compat_atmif_sioc __user *csioc = arg;
+ compat_uptr_t carg;
+
+ sioc_len = &csioc->length;
+ if (get_user(carg, &csioc->arg))
+ return -EFAULT;
+ buf = compat_ptr(carg);
+
+ if (get_user(len, &csioc->length))
+ return -EFAULT;
+ if (get_user(number, &csioc->number))
+ return -EFAULT;
+#endif
+ } else {
+ struct atmif_sioc __user *sioc = arg;
+
+ sioc_len = &sioc->length;
+ if (get_user(buf, &sioc->arg))
+ return -EFAULT;
+ if (get_user(len, &sioc->length))
+ return -EFAULT;
+ if (get_user(number, &sioc->number))
+ return -EFAULT;
+ }
if (!(dev = try_then_request_module(atm_dev_lookup(number),
"atm-device-%d", number)))
return -ENODEV;
@@ -358,7 +396,7 @@ int atm_dev_ioctl(unsigned int cmd, void __user *arg)
size = error;
/* may return 0, but later on size == 0 means "don't
write the length" */
- error = put_user(size, &sioc->length)
+ error = put_user(size, sioc_len)
? -EFAULT : 0;
goto done;
case ATM_SETLOOP:
@@ -380,11 +418,21 @@ int atm_dev_ioctl(unsigned int cmd, void __user *arg)
}
/* fall through */
default:
- if (!dev->ops->ioctl) {
- error = -EINVAL;
- goto done;
+ if (compat) {
+#ifdef CONFIG_COMPAT
+ if (!dev->ops->compat_ioctl) {
+ error = -EINVAL;
+ goto done;
+ }
+ size = dev->ops->compat_ioctl(dev, cmd, buf);
+#endif
+ } else {
+ if (!dev->ops->ioctl) {
+ error = -EINVAL;
+ goto done;
+ }
+ size = dev->ops->ioctl(dev, cmd, buf);
}
- size = dev->ops->ioctl(dev, cmd, buf);
if (size < 0) {
error = (size == -ENOIOCTLCMD ? -EINVAL : size);
goto done;
@@ -392,7 +440,7 @@ int atm_dev_ioctl(unsigned int cmd, void __user *arg)
}
if (size)
- error = put_user(size, &sioc->length)
+ error = put_user(size, sioc_len)
? -EFAULT : 0;
else
error = 0;