cleanup compat ioctl handling

Merge all compat ioctl handling into compat_ioctl.c instead of splitting it
over compat.c and compat_ioctl.c.  This also allows to get rid of ioctl32.h

Signed-off-by: Christoph Hellwig <hch@lst.de>
Looks-good-to: Andi Kleen <ak@suse.de>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 165 insertions, 5 deletions

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index a0c3d2044e84..6972d242fbdf 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -57,7 +57,6 @@
 #include <linux/serial.h>
 #include <linux/if_tun.h>
 #include <linux/ctype.h>
-#include <linux/ioctl32.h>
 #include <linux/syscalls.h>
 #include <linux/i2c.h>
 #include <linux/i2c-dev.h>
@@ -65,7 +64,6 @@
 #include <linux/atalk.h>
 #include <linux/blktrace_api.h>
 
-#include <net/sock.h>          /* siocdevprivate_ioctl */
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci.h>
 #include <net/bluetooth/rfcomm.h>
@@ -474,7 +472,7 @@ static int bond_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 	};
 }
 
-int siocdevprivate_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int siocdevprivate_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
 {
 	struct ifreq __user *u_ifreq64;
 	struct ifreq32 __user *u_ifreq32 = compat_ptr(arg);
@@ -2384,6 +2382,16 @@ lp_timeout_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
 	return sys_ioctl(fd, cmd, (unsigned long)tn);
 }
 
+
+typedef int (*ioctl_trans_handler_t)(unsigned int, unsigned int,
+					unsigned long, struct file *);
+
+struct ioctl_trans {
+	unsigned long cmd;
+	ioctl_trans_handler_t handler;
+	struct ioctl_trans *next;
+};
+
 #define HANDLE_IOCTL(cmd,handler) \
 	{ (cmd), (ioctl_trans_handler_t)(handler) },
 
@@ -2404,7 +2412,7 @@ lp_timeout_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
    Most other reasons are not valid. */
 #define IGNORE_IOCTL(cmd) COMPATIBLE_IOCTL(cmd)
 
-struct ioctl_trans ioctl_start[] = {
+static struct ioctl_trans ioctl_start[] = {
 /* compatible ioctls first */
 COMPATIBLE_IOCTL(0x4B50)   /* KDGHWCLK - not in the kernel, but don't complain */
 COMPATIBLE_IOCTL(0x4B51)   /* KDSHWCLK - not in the kernel, but don't complain */
@@ -3464,4 +3472,156 @@ IGNORE_IOCTL(VFAT_IOCTL_READDIR_BOTH32)
 IGNORE_IOCTL(VFAT_IOCTL_READDIR_SHORT32)
 };
 
-int ioctl_table_size = ARRAY_SIZE(ioctl_start);
+#define IOCTL_HASHSIZE 256
+static struct ioctl_trans *ioctl32_hash_table[IOCTL_HASHSIZE];
+
+static inline unsigned long ioctl32_hash(unsigned long cmd)
+{
+	return (((cmd >> 6) ^ (cmd >> 4) ^ cmd)) % IOCTL_HASHSIZE;
+}
+
+static void compat_ioctl_error(struct file *filp, unsigned int fd,
+		unsigned int cmd, unsigned long arg)
+{
+	char buf[10];
+	char *fn = "?";
+	char *path;
+
+	/* find the name of the device. */
+	path = (char *)__get_free_page(GFP_KERNEL);
+	if (path) {
+		fn = d_path(filp->f_path.dentry, filp->f_path.mnt, path, PAGE_SIZE);
+		if (IS_ERR(fn))
+			fn = "?";
+	}
+
+	 sprintf(buf,"'%c'", (cmd>>_IOC_TYPESHIFT) & _IOC_TYPEMASK);
+	if (!isprint(buf[1]))
+		sprintf(buf, "%02x", buf[1]);
+	compat_printk("ioctl32(%s:%d): Unknown cmd fd(%d) "
+			"cmd(%08x){t:%s;sz:%u} arg(%08x) on %s\n",
+			current->comm, current->pid,
+			(int)fd, (unsigned int)cmd, buf,
+			(cmd >> _IOC_SIZESHIFT) & _IOC_SIZEMASK,
+			(unsigned int)arg, fn);
+
+	if (path)
+		free_page((unsigned long)path);
+}
+
+asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
+				unsigned long arg)
+{
+	struct file *filp;
+	int error = -EBADF;
+	struct ioctl_trans *t;
+	int fput_needed;
+
+	filp = fget_light(fd, &fput_needed);
+	if (!filp)
+		goto out;
+
+	/* RED-PEN how should LSM module know it's handling 32bit? */
+	error = security_file_ioctl(filp, cmd, arg);
+	if (error)
+		goto out_fput;
+
+	/*
+	 * To allow the compat_ioctl handlers to be self contained
+	 * we need to check the common ioctls here first.
+	 * Just handle them with the standard handlers below.
+	 */
+	switch (cmd) {
+	case FIOCLEX:
+	case FIONCLEX:
+	case FIONBIO:
+	case FIOASYNC:
+	case FIOQSIZE:
+		break;
+
+	case FIBMAP:
+	case FIGETBSZ:
+	case FIONREAD:
+		if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
+			break;
+		/*FALL THROUGH*/
+
+	default:
+		if (filp->f_op && filp->f_op->compat_ioctl) {
+			error = filp->f_op->compat_ioctl(filp, cmd, arg);
+			if (error != -ENOIOCTLCMD)
+				goto out_fput;
+		}
+
+		if (!filp->f_op ||
+		    (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
+			goto do_ioctl;
+		break;
+	}
+
+	for (t = ioctl32_hash_table[ioctl32_hash(cmd)]; t; t = t->next) {
+		if (t->cmd == cmd)
+			goto found_handler;
+	}
+
+	if (S_ISSOCK(filp->f_path.dentry->d_inode->i_mode) &&
+	    cmd >= SIOCDEVPRIVATE && cmd <= (SIOCDEVPRIVATE + 15)) {
+		error = siocdevprivate_ioctl(fd, cmd, arg);
+	} else {
+		static int count;
+
+		if (++count <= 50)
+			compat_ioctl_error(filp, fd, cmd, arg);
+		error = -EINVAL;
+	}
+
+	goto out_fput;
+
+ found_handler:
+	if (t->handler) {
+		lock_kernel();
+		error = t->handler(fd, cmd, arg, filp);
+		unlock_kernel();
+		goto out_fput;
+	}
+
+ do_ioctl:
+	error = vfs_ioctl(filp, fd, cmd, arg);
+ out_fput:
+	fput_light(filp, fput_needed);
+ out:
+	return error;
+}
+
+static void ioctl32_insert_translation(struct ioctl_trans *trans)
+{
+	unsigned long hash;
+	struct ioctl_trans *t;
+
+	hash = ioctl32_hash (trans->cmd);
+	if (!ioctl32_hash_table[hash])
+		ioctl32_hash_table[hash] = trans;
+	else {
+		t = ioctl32_hash_table[hash];
+		while (t->next)
+			t = t->next;
+		trans->next = NULL;
+		t->next = trans;
+	}
+}
+
+static int __init init_sys32_ioctl(void)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(ioctl_start); i++) {
+		if (ioctl_start[i].next != 0) {
+			printk("ioctl translation %d bad\n",i);
+			return -1;
+		}
+
+		ioctl32_insert_translation(&ioctl_start[i]);
+	}
+	return 0;
+}
+__initcall(init_sys32_ioctl);