net/atm: move all compat_ioctl handling to atm/ioctl.c

We have two implementations of the compat_ioctl handling for ATM, the
one that we have had for ages in fs/compat_ioctl.c and the one added to
net/atm/ioctl.c by David Woodhouse. Unfortunately, both versions are
incomplete, and in practice we use a very confusing combination of the
two.

For ioctl numbers that have the same identifier on 32 and 64 bit systems,
we go directly through the compat_ioctl socket operation, for those that

differ, we do a conversion in fs/compat_ioctl.c.

This patch moves both variants into the vcc_compat_ioctl() function,
while preserving the current behaviour. It also kills off the COMPATIBLE_IOCTL
definitions that we never use here.
Doing it this way is clearly not a good solution, but I hope it is a
step into the right direction, so that someone is able to clean up this
mess for real.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 175 insertions, 2 deletions

diff --git a/net/atm/ioctl.c b/net/atm/ioctl.c
index 4da8892ced5f..2ea40995dced 100644
--- a/net/atm/ioctl.c
+++ b/net/atm/ioctl.c
@@ -191,8 +191,181 @@ int vcc_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 }
 
 #ifdef CONFIG_COMPAT
-int vcc_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+/*
+ * FIXME:
+ * The compat_ioctl handling is duplicated, using both these conversion
+ * routines and the compat argument to the actual handlers. Both
+ * versions are somewhat incomplete and should be merged, e.g. by
+ * moving the ioctl number translation into the actual handlers and
+ * killing the conversion code.
+ *
+ * -arnd, November 2009
+ */
+#define ATM_GETLINKRATE32 _IOW('a', ATMIOC_ITF+1, struct compat_atmif_sioc)
+#define ATM_GETNAMES32    _IOW('a', ATMIOC_ITF+3, struct compat_atm_iobuf)
+#define ATM_GETTYPE32     _IOW('a', ATMIOC_ITF+4, struct compat_atmif_sioc)
+#define ATM_GETESI32      _IOW('a', ATMIOC_ITF+5, struct compat_atmif_sioc)
+#define ATM_GETADDR32     _IOW('a', ATMIOC_ITF+6, struct compat_atmif_sioc)
+#define ATM_RSTADDR32     _IOW('a', ATMIOC_ITF+7, struct compat_atmif_sioc)
+#define ATM_ADDADDR32     _IOW('a', ATMIOC_ITF+8, struct compat_atmif_sioc)
+#define ATM_DELADDR32     _IOW('a', ATMIOC_ITF+9, struct compat_atmif_sioc)
+#define ATM_GETCIRANGE32  _IOW('a', ATMIOC_ITF+10, struct compat_atmif_sioc)
+#define ATM_SETCIRANGE32  _IOW('a', ATMIOC_ITF+11, struct compat_atmif_sioc)
+#define ATM_SETESI32      _IOW('a', ATMIOC_ITF+12, struct compat_atmif_sioc)
+#define ATM_SETESIF32     _IOW('a', ATMIOC_ITF+13, struct compat_atmif_sioc)
+#define ATM_GETSTAT32     _IOW('a', ATMIOC_SARCOM+0, struct compat_atmif_sioc)
+#define ATM_GETSTATZ32    _IOW('a', ATMIOC_SARCOM+1, struct compat_atmif_sioc)
+#define ATM_GETLOOP32     _IOW('a', ATMIOC_SARCOM+2, struct compat_atmif_sioc)
+#define ATM_SETLOOP32     _IOW('a', ATMIOC_SARCOM+3, struct compat_atmif_sioc)
+#define ATM_QUERYLOOP32   _IOW('a', ATMIOC_SARCOM+4, struct compat_atmif_sioc)
+
+static struct {
+        unsigned int cmd32;
+        unsigned int cmd;
+} atm_ioctl_map[] = {
+        { ATM_GETLINKRATE32, ATM_GETLINKRATE },
+        { ATM_GETNAMES32,    ATM_GETNAMES },
+        { ATM_GETTYPE32,     ATM_GETTYPE },
+        { ATM_GETESI32,      ATM_GETESI },
+        { ATM_GETADDR32,     ATM_GETADDR },
+        { ATM_RSTADDR32,     ATM_RSTADDR },
+        { ATM_ADDADDR32,     ATM_ADDADDR },
+        { ATM_DELADDR32,     ATM_DELADDR },
+        { ATM_GETCIRANGE32,  ATM_GETCIRANGE },
+        { ATM_SETCIRANGE32,  ATM_SETCIRANGE },
+        { ATM_SETESI32,      ATM_SETESI },
+        { ATM_SETESIF32,     ATM_SETESIF },
+        { ATM_GETSTAT32,     ATM_GETSTAT },
+        { ATM_GETSTATZ32,    ATM_GETSTATZ },
+        { ATM_GETLOOP32,     ATM_GETLOOP },
+        { ATM_SETLOOP32,     ATM_SETLOOP },
+        { ATM_QUERYLOOP32,   ATM_QUERYLOOP },
+};
+
+#define NR_ATM_IOCTL ARRAY_SIZE(atm_ioctl_map)
+
+static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
+                        unsigned long arg)
+{
+        struct atm_iobuf __user *iobuf;
+        struct compat_atm_iobuf __user *iobuf32;
+        u32 data;
+        void __user *datap;
+        int len, err;
+
+        iobuf = compat_alloc_user_space(sizeof(*iobuf));
+        iobuf32 = compat_ptr(arg);
+
+        if (get_user(len, &iobuf32->length) ||
+            get_user(data, &iobuf32->buffer))
+                return -EFAULT;
+        datap = compat_ptr(data);
+        if (put_user(len, &iobuf->length) ||
+            put_user(datap, &iobuf->buffer))
+                return -EFAULT;
+
+        err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
+
+        if (!err) {
+                if (copy_in_user(&iobuf32->length, &iobuf->length,
+                                 sizeof(int)))
+                        err = -EFAULT;
+        }
+
+        return err;
+}
+
+static int do_atmif_sioc(struct socket *sock, unsigned int cmd,
+                         unsigned long arg)
+{
+        struct atmif_sioc __user *sioc;
+        struct compat_atmif_sioc __user *sioc32;
+        u32 data;
+        void __user *datap;
+        int err;
+
+        sioc = compat_alloc_user_space(sizeof(*sioc));
+        sioc32 = compat_ptr(arg);
+
+        if (copy_in_user(&sioc->number, &sioc32->number, 2 * sizeof(int))
+            || get_user(data, &sioc32->arg))
+                return -EFAULT;
+        datap = compat_ptr(data);
+        if (put_user(datap, &sioc->arg))
+                return -EFAULT;
+
+        err = do_vcc_ioctl(sock, cmd, (unsigned long) sioc, 0);
+
+        if (!err) {
+                if (copy_in_user(&sioc32->length, &sioc->length,
+                                 sizeof(int)))
+                        err = -EFAULT;
+        }
+        return err;
+}
+
+static int do_atm_ioctl(struct socket *sock, unsigned int cmd32,
+                        unsigned long arg)
+{
+        int i;
+        unsigned int cmd = 0;
+
+        switch (cmd32) {
+        case SONET_GETSTAT:
+        case SONET_GETSTATZ:
+        case SONET_GETDIAG:
+        case SONET_SETDIAG:
+        case SONET_CLRDIAG:
+        case SONET_SETFRAMING:
+        case SONET_GETFRAMING:
+        case SONET_GETFRSENSE:
+                return do_atmif_sioc(sock, cmd32, arg);
+        }
+
+        for (i = 0; i < NR_ATM_IOCTL; i++) {
+                if (cmd32 == atm_ioctl_map[i].cmd32) {
+                        cmd = atm_ioctl_map[i].cmd;
+                        break;
+                }
+        }
+        if (i == NR_ATM_IOCTL)
+                return -EINVAL;
+
+        switch (cmd) {
+        case ATM_GETNAMES:
+                return do_atm_iobuf(sock, cmd, arg);
+
+        case ATM_GETLINKRATE:
+        case ATM_GETTYPE:
+        case ATM_GETESI:
+        case ATM_GETADDR:
+        case ATM_RSTADDR:
+        case ATM_ADDADDR:
+        case ATM_DELADDR:
+        case ATM_GETCIRANGE:
+        case ATM_SETCIRANGE:
+        case ATM_SETESI:
+        case ATM_SETESIF:
+        case ATM_GETSTAT:
+        case ATM_GETSTATZ:
+        case ATM_GETLOOP:
+        case ATM_SETLOOP:
+        case ATM_QUERYLOOP:
+                return do_atmif_sioc(sock, cmd, arg);
+        }
+
+        return -EINVAL;
+}
+
+int vcc_compat_ioctl(struct socket *sock, unsigned int cmd,
+                     unsigned long arg)
 {
-        return do_vcc_ioctl(sock, cmd, arg, 1);
+        int ret;
+
+        ret = do_vcc_ioctl(sock, cmd, arg, 1);
+        if (ret != -ENOIOCTLCMD)
+                return ret;
+
+        return do_atm_ioctl(sock, cmd, arg);
 }
 #endif