1/*-
2 * Copyright (c) 1994-1995 S��ren Schmidt
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer
10 *    in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 *    derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include <sys/cdefs.h>
30__FBSDID("$FreeBSD$");
31
32#include "opt_compat.h"
33
34#include <sys/param.h>
35#include <sys/dirent.h>
36#include <sys/file.h>
37#include <sys/filedesc.h>
38#include <sys/proc.h>
39#include <sys/malloc.h>
40#include <sys/mount.h>
41#include <sys/namei.h>
42#include <sys/stat.h>
43#include <sys/syscallsubr.h>
44#include <sys/systm.h>
45#include <sys/tty.h>
46#include <sys/vnode.h>
47#include <sys/conf.h>
48#include <sys/fcntl.h>
49
50#ifdef COMPAT_LINUX32
51#include <machine/../linux32/linux.h>
52#include <machine/../linux32/linux32_proto.h>
53#else
54#include <machine/../linux/linux.h>
55#include <machine/../linux/linux_proto.h>
56#endif
57
58#include <compat/linux/linux_util.h>
59#include <compat/linux/linux_file.h>
60
61#define	LINUX_SHMFS_MAGIC 0x01021994
62
63static void
64translate_vnhook_major_minor(struct vnode *vp, struct stat *sb)
65{
66	int major, minor;
67
68	if (vp->v_type == VCHR && vp->v_rdev != NULL &&
69	    linux_driver_get_major_minor(devtoname(vp->v_rdev),
70	    &major, &minor) == 0) {
71		sb->st_rdev = (major << 8 | minor);
72	}
73}
74
75static int
76linux_kern_statat(struct thread *td, int flag, int fd, char *path,
77    enum uio_seg pathseg, struct stat *sbp)
78{
79
80	return (kern_statat_vnhook(td, flag, fd, path, pathseg, sbp,
81	    translate_vnhook_major_minor));
82}
83
84static int
85linux_kern_stat(struct thread *td, char *path, enum uio_seg pathseg,
86    struct stat *sbp)
87{
88
89	return (linux_kern_statat(td, 0, AT_FDCWD, path, pathseg, sbp));
90}
91
92static int
93linux_kern_lstat(struct thread *td, char *path, enum uio_seg pathseg,
94    struct stat *sbp)
95{
96
97	return (linux_kern_statat(td, AT_SYMLINK_NOFOLLOW, AT_FDCWD, path,
98	    pathseg, sbp));
99}
100
101/*
102 * XXX: This was removed from newstat_copyout(), and almost identical
103 * XXX: code was in stat64_copyout().  findcdev() needs to be replaced
104 * XXX: with something that does lookup and locking properly.
105 * XXX: When somebody fixes this: please try to avoid duplicating it.
106 */
107#if 0
108static void
109disk_foo(struct somestat *tbuf)
110{
111	struct cdevsw *cdevsw;
112	struct cdev *dev;
113
114	/* Lie about disk drives which are character devices
115	 * in FreeBSD but block devices under Linux.
116	 */
117	if (S_ISCHR(tbuf.st_mode) &&
118	    (dev = findcdev(buf->st_rdev)) != NULL) {
119		cdevsw = dev_refthread(dev);
120		if (cdevsw != NULL) {
121			if (cdevsw->d_flags & D_DISK) {
122				tbuf.st_mode &= ~S_IFMT;
123				tbuf.st_mode |= S_IFBLK;
124
125				/* XXX this may not be quite right */
126				/* Map major number to 0 */
127				tbuf.st_dev = minor(buf->st_dev) & 0xf;
128				tbuf.st_rdev = buf->st_rdev & 0xff;
129			}
130			dev_relthread(dev);
131		}
132	}
133
134}
135#endif
136
137static void
138translate_fd_major_minor(struct thread *td, int fd, struct stat *buf)
139{
140	struct file *fp;
141	struct vnode *vp;
142	int major, minor;
143
144	/*
145	 * No capability rights required here.
146	 */
147	if ((!S_ISCHR(buf->st_mode) && !S_ISBLK(buf->st_mode)) ||
148	    fget(td, fd, 0, &fp) != 0)
149		return;
150	vp = fp->f_vnode;
151	if (vp != NULL && vp->v_rdev != NULL &&
152	    linux_driver_get_major_minor(devtoname(vp->v_rdev),
153					 &major, &minor) == 0) {
154		buf->st_rdev = (major << 8 | minor);
155	} else if (fp->f_type == DTYPE_PTS) {
156		struct tty *tp = fp->f_data;
157
158		/* Convert the numbers for the slave device. */
159		if (linux_driver_get_major_minor(devtoname(tp->t_dev),
160					 &major, &minor) == 0) {
161			buf->st_rdev = (major << 8 | minor);
162		}
163	}
164	fdrop(fp, td);
165}
166
167static int
168newstat_copyout(struct stat *buf, void *ubuf)
169{
170	struct l_newstat tbuf;
171
172	bzero(&tbuf, sizeof(tbuf));
173	tbuf.st_dev = minor(buf->st_dev) | (major(buf->st_dev) << 8);
174	tbuf.st_ino = buf->st_ino;
175	tbuf.st_mode = buf->st_mode;
176	tbuf.st_nlink = buf->st_nlink;
177	tbuf.st_uid = buf->st_uid;
178	tbuf.st_gid = buf->st_gid;
179	tbuf.st_rdev = buf->st_rdev;
180	tbuf.st_size = buf->st_size;
181	tbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
182	tbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
183	tbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
184	tbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
185	tbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
186	tbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
187	tbuf.st_blksize = buf->st_blksize;
188	tbuf.st_blocks = buf->st_blocks;
189
190	return (copyout(&tbuf, ubuf, sizeof(tbuf)));
191}
192
193int
194linux_newstat(struct thread *td, struct linux_newstat_args *args)
195{
196	struct stat buf;
197	char *path;
198	int error;
199
200	LCONVPATHEXIST(td, args->path, &path);
201
202#ifdef DEBUG
203	if (ldebug(newstat))
204		printf(ARGS(newstat, "%s, *"), path);
205#endif
206
207	error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf);
208	LFREEPATH(path);
209	if (error)
210		return (error);
211	return (newstat_copyout(&buf, args->buf));
212}
213
214int
215linux_newlstat(struct thread *td, struct linux_newlstat_args *args)
216{
217	struct stat sb;
218	char *path;
219	int error;
220
221	LCONVPATHEXIST(td, args->path, &path);
222
223#ifdef DEBUG
224	if (ldebug(newlstat))
225		printf(ARGS(newlstat, "%s, *"), path);
226#endif
227
228	error = linux_kern_lstat(td, path, UIO_SYSSPACE, &sb);
229	LFREEPATH(path);
230	if (error)
231		return (error);
232	return (newstat_copyout(&sb, args->buf));
233}
234
235int
236linux_newfstat(struct thread *td, struct linux_newfstat_args *args)
237{
238	struct stat buf;
239	int error;
240
241#ifdef DEBUG
242	if (ldebug(newfstat))
243		printf(ARGS(newfstat, "%d, *"), args->fd);
244#endif
245
246	error = kern_fstat(td, args->fd, &buf);
247	translate_fd_major_minor(td, args->fd, &buf);
248	if (!error)
249		error = newstat_copyout(&buf, args->buf);
250
251	return (error);
252}
253
254static int
255stat_copyout(struct stat *buf, void *ubuf)
256{
257	struct l_stat lbuf;
258
259	bzero(&lbuf, sizeof(lbuf));
260	lbuf.st_dev = buf->st_dev;
261	lbuf.st_ino = buf->st_ino;
262	lbuf.st_mode = buf->st_mode;
263	lbuf.st_nlink = buf->st_nlink;
264	lbuf.st_uid = buf->st_uid;
265	lbuf.st_gid = buf->st_gid;
266	lbuf.st_rdev = buf->st_rdev;
267	if (buf->st_size < (quad_t)1 << 32)
268		lbuf.st_size = buf->st_size;
269	else
270		lbuf.st_size = -2;
271	lbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
272	lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
273	lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
274	lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
275	lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
276	lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
277	lbuf.st_blksize = buf->st_blksize;
278	lbuf.st_blocks = buf->st_blocks;
279	lbuf.st_flags = buf->st_flags;
280	lbuf.st_gen = buf->st_gen;
281
282	return (copyout(&lbuf, ubuf, sizeof(lbuf)));
283}
284
285int
286linux_stat(struct thread *td, struct linux_stat_args *args)
287{
288	struct stat buf;
289	char *path;
290	int error;
291
292	LCONVPATHEXIST(td, args->path, &path);
293
294#ifdef DEBUG
295	if (ldebug(stat))
296		printf(ARGS(stat, "%s, *"), path);
297#endif
298	error = linux_kern_stat(td, path, UIO_SYSSPACE, &buf);
299	if (error) {
300		LFREEPATH(path);
301		return (error);
302	}
303	LFREEPATH(path);
304	return(stat_copyout(&buf, args->up));
305}
306
307int
308linux_lstat(struct thread *td, struct linux_lstat_args *args)
309{
310	struct stat buf;
311	char *path;
312	int error;
313
314	LCONVPATHEXIST(td, args->path, &path);
315
316#ifdef DEBUG
317	if (ldebug(lstat))
318		printf(ARGS(lstat, "%s, *"), path);
319#endif
320	error = linux_kern_lstat(td, path, UIO_SYSSPACE, &buf);
321	if (error) {
322		LFREEPATH(path);
323		return (error);
324	}
325	LFREEPATH(path);
326	return(stat_copyout(&buf, args->up));
327}
328
329/* XXX - All fields of type l_int are defined as l_long on i386 */
330struct l_statfs {
331	l_int		f_type;
332	l_int		f_bsize;
333	l_int		f_blocks;
334	l_int		f_bfree;
335	l_int		f_bavail;
336	l_int		f_files;
337	l_int		f_ffree;
338	l_fsid_t	f_fsid;
339	l_int		f_namelen;
340	l_int		f_spare[6];
341};
342
343#define	LINUX_CODA_SUPER_MAGIC	0x73757245L
344#define	LINUX_EXT2_SUPER_MAGIC	0xEF53L
345#define	LINUX_HPFS_SUPER_MAGIC	0xf995e849L
346#define	LINUX_ISOFS_SUPER_MAGIC	0x9660L
347#define	LINUX_MSDOS_SUPER_MAGIC	0x4d44L
348#define	LINUX_NCP_SUPER_MAGIC	0x564cL
349#define	LINUX_NFS_SUPER_MAGIC	0x6969L
350#define	LINUX_NTFS_SUPER_MAGIC	0x5346544EL
351#define	LINUX_PROC_SUPER_MAGIC	0x9fa0L
352#define	LINUX_UFS_SUPER_MAGIC	0x00011954L	/* XXX - UFS_MAGIC in Linux */
353#define LINUX_DEVFS_SUPER_MAGIC	0x1373L
354
355static long
356bsd_to_linux_ftype(const char *fstypename)
357{
358	int i;
359	static struct {const char *bsd_name; long linux_type;} b2l_tbl[] = {
360		{"ufs",     LINUX_UFS_SUPER_MAGIC},
361		{"cd9660",  LINUX_ISOFS_SUPER_MAGIC},
362		{"nfs",     LINUX_NFS_SUPER_MAGIC},
363		{"ext2fs",  LINUX_EXT2_SUPER_MAGIC},
364		{"procfs",  LINUX_PROC_SUPER_MAGIC},
365		{"msdosfs", LINUX_MSDOS_SUPER_MAGIC},
366		{"ntfs",    LINUX_NTFS_SUPER_MAGIC},
367		{"nwfs",    LINUX_NCP_SUPER_MAGIC},
368		{"hpfs",    LINUX_HPFS_SUPER_MAGIC},
369		{"coda",    LINUX_CODA_SUPER_MAGIC},
370		{"devfs",   LINUX_DEVFS_SUPER_MAGIC},
371		{NULL,      0L}};
372
373	for (i = 0; b2l_tbl[i].bsd_name != NULL; i++)
374		if (strcmp(b2l_tbl[i].bsd_name, fstypename) == 0)
375			return (b2l_tbl[i].linux_type);
376
377	return (0L);
378}
379
380static void
381bsd_to_linux_statfs(struct statfs *bsd_statfs, struct l_statfs *linux_statfs)
382{
383
384	linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
385	linux_statfs->f_bsize = bsd_statfs->f_bsize;
386	linux_statfs->f_blocks = bsd_statfs->f_blocks;
387	linux_statfs->f_bfree = bsd_statfs->f_bfree;
388	linux_statfs->f_bavail = bsd_statfs->f_bavail;
389	linux_statfs->f_ffree = bsd_statfs->f_ffree;
390	linux_statfs->f_files = bsd_statfs->f_files;
391	linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
392	linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
393	linux_statfs->f_namelen = MAXNAMLEN;
394}
395
396int
397linux_statfs(struct thread *td, struct linux_statfs_args *args)
398{
399	struct l_statfs linux_statfs;
400	struct statfs bsd_statfs;
401	char *path;
402	int error, dev_shm;
403
404	LCONVPATHEXIST(td, args->path, &path);
405
406#ifdef DEBUG
407	if (ldebug(statfs))
408		printf(ARGS(statfs, "%s, *"), path);
409#endif
410	dev_shm = 0;
411	error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
412	if (strncmp(path, "/dev/shm", sizeof("/dev/shm") - 1) == 0)
413		dev_shm = (path[8] == '\0'
414		    || (path[8] == '/' && path[9] == '\0'));
415	LFREEPATH(path);
416	if (error)
417		return (error);
418	bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
419	if (dev_shm)
420		linux_statfs.f_type = LINUX_SHMFS_MAGIC;
421	return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
422}
423
424static void
425bsd_to_linux_statfs64(struct statfs *bsd_statfs, struct l_statfs64 *linux_statfs)
426{
427
428	linux_statfs->f_type = bsd_to_linux_ftype(bsd_statfs->f_fstypename);
429	linux_statfs->f_bsize = bsd_statfs->f_bsize;
430	linux_statfs->f_blocks = bsd_statfs->f_blocks;
431	linux_statfs->f_bfree = bsd_statfs->f_bfree;
432	linux_statfs->f_bavail = bsd_statfs->f_bavail;
433	linux_statfs->f_ffree = bsd_statfs->f_ffree;
434	linux_statfs->f_files = bsd_statfs->f_files;
435	linux_statfs->f_fsid.val[0] = bsd_statfs->f_fsid.val[0];
436	linux_statfs->f_fsid.val[1] = bsd_statfs->f_fsid.val[1];
437	linux_statfs->f_namelen = MAXNAMLEN;
438}
439
440int
441linux_statfs64(struct thread *td, struct linux_statfs64_args *args)
442{
443	struct l_statfs64 linux_statfs;
444	struct statfs bsd_statfs;
445	char *path;
446	int error;
447
448	if (args->bufsize != sizeof(struct l_statfs64))
449		return EINVAL;
450
451	LCONVPATHEXIST(td, args->path, &path);
452
453#ifdef DEBUG
454	if (ldebug(statfs64))
455		printf(ARGS(statfs64, "%s, *"), path);
456#endif
457	error = kern_statfs(td, path, UIO_SYSSPACE, &bsd_statfs);
458	LFREEPATH(path);
459	if (error)
460		return (error);
461	bsd_to_linux_statfs64(&bsd_statfs, &linux_statfs);
462	return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
463}
464
465int
466linux_fstatfs(struct thread *td, struct linux_fstatfs_args *args)
467{
468	struct l_statfs linux_statfs;
469	struct statfs bsd_statfs;
470	int error;
471
472#ifdef DEBUG
473	if (ldebug(fstatfs))
474		printf(ARGS(fstatfs, "%d, *"), args->fd);
475#endif
476	error = kern_fstatfs(td, args->fd, &bsd_statfs);
477	if (error)
478		return error;
479	bsd_to_linux_statfs(&bsd_statfs, &linux_statfs);
480	return copyout(&linux_statfs, args->buf, sizeof(linux_statfs));
481}
482
483struct l_ustat
484{
485	l_daddr_t	f_tfree;
486	l_ino_t		f_tinode;
487	char		f_fname[6];
488	char		f_fpack[6];
489};
490
491int
492linux_ustat(struct thread *td, struct linux_ustat_args *args)
493{
494#ifdef DEBUG
495	if (ldebug(ustat))
496		printf(ARGS(ustat, "%d, *"), args->dev);
497#endif
498
499	return (EOPNOTSUPP);
500}
501
502#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
503
504static int
505stat64_copyout(struct stat *buf, void *ubuf)
506{
507	struct l_stat64 lbuf;
508
509	bzero(&lbuf, sizeof(lbuf));
510	lbuf.st_dev = minor(buf->st_dev) | (major(buf->st_dev) << 8);
511	lbuf.st_ino = buf->st_ino;
512	lbuf.st_mode = buf->st_mode;
513	lbuf.st_nlink = buf->st_nlink;
514	lbuf.st_uid = buf->st_uid;
515	lbuf.st_gid = buf->st_gid;
516	lbuf.st_rdev = buf->st_rdev;
517	lbuf.st_size = buf->st_size;
518	lbuf.st_atim.tv_sec = buf->st_atim.tv_sec;
519	lbuf.st_atim.tv_nsec = buf->st_atim.tv_nsec;
520	lbuf.st_mtim.tv_sec = buf->st_mtim.tv_sec;
521	lbuf.st_mtim.tv_nsec = buf->st_mtim.tv_nsec;
522	lbuf.st_ctim.tv_sec = buf->st_ctim.tv_sec;
523	lbuf.st_ctim.tv_nsec = buf->st_ctim.tv_nsec;
524	lbuf.st_blksize = buf->st_blksize;
525	lbuf.st_blocks = buf->st_blocks;
526
527	/*
528	 * The __st_ino field makes all the difference. In the Linux kernel
529	 * it is conditionally compiled based on STAT64_HAS_BROKEN_ST_INO,
530	 * but without the assignment to __st_ino the runtime linker refuses
531	 * to mmap(2) any shared libraries. I guess it's broken alright :-)
532	 */
533	lbuf.__st_ino = buf->st_ino;
534
535	return (copyout(&lbuf, ubuf, sizeof(lbuf)));
536}
537
538int
539linux_stat64(struct thread *td, struct linux_stat64_args *args)
540{
541	struct stat buf;
542	char *filename;
543	int error;
544
545	LCONVPATHEXIST(td, args->filename, &filename);
546
547#ifdef DEBUG
548	if (ldebug(stat64))
549		printf(ARGS(stat64, "%s, *"), filename);
550#endif
551
552	error = linux_kern_stat(td, filename, UIO_SYSSPACE, &buf);
553	LFREEPATH(filename);
554	if (error)
555		return (error);
556	return (stat64_copyout(&buf, args->statbuf));
557}
558
559int
560linux_lstat64(struct thread *td, struct linux_lstat64_args *args)
561{
562	struct stat sb;
563	char *filename;
564	int error;
565
566	LCONVPATHEXIST(td, args->filename, &filename);
567
568#ifdef DEBUG
569	if (ldebug(lstat64))
570		printf(ARGS(lstat64, "%s, *"), args->filename);
571#endif
572
573	error = linux_kern_lstat(td, filename, UIO_SYSSPACE, &sb);
574	LFREEPATH(filename);
575	if (error)
576		return (error);
577	return (stat64_copyout(&sb, args->statbuf));
578}
579
580int
581linux_fstat64(struct thread *td, struct linux_fstat64_args *args)
582{
583	struct stat buf;
584	int error;
585
586#ifdef DEBUG
587	if (ldebug(fstat64))
588		printf(ARGS(fstat64, "%d, *"), args->fd);
589#endif
590
591	error = kern_fstat(td, args->fd, &buf);
592	translate_fd_major_minor(td, args->fd, &buf);
593	if (!error)
594		error = stat64_copyout(&buf, args->statbuf);
595
596	return (error);
597}
598
599int
600linux_fstatat64(struct thread *td, struct linux_fstatat64_args *args)
601{
602	char *path;
603	int error, dfd, flag;
604	struct stat buf;
605
606	if (args->flag & ~LINUX_AT_SYMLINK_NOFOLLOW)
607		return (EINVAL);
608	flag = (args->flag & LINUX_AT_SYMLINK_NOFOLLOW) ?
609	    AT_SYMLINK_NOFOLLOW : 0;
610
611	dfd = (args->dfd == LINUX_AT_FDCWD) ? AT_FDCWD : args->dfd;
612	LCONVPATHEXIST_AT(td, args->pathname, &path, dfd);
613
614#ifdef DEBUG
615	if (ldebug(fstatat64))
616		printf(ARGS(fstatat64, "%i, %s, %i"), args->dfd, path, args->flag);
617#endif
618
619	error = linux_kern_statat(td, flag, dfd, path, UIO_SYSSPACE, &buf);
620	if (!error)
621		error = stat64_copyout(&buf, args->statbuf);
622	LFREEPATH(path);
623
624	return (error);
625}
626
627#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
628