1 // SPDX-License-Identifier: GPL-2.0
7  * Extensive rewrite by Neil Brown <neilb@cse.unsw.edu.au> Southern-Spring 1999
8  * ... and again Southern-Winter 2001 to support export_operations
25  * if not, require that we can walk up to exp->ex_dentry
35 	if (exp->ex_flags & NFSEXP_NOSUBTREECHECK)  in nfsd_acceptable()
39 	while (tdentry != exp->ex_path.dentry && !IS_ROOT(tdentry)) {  in nfsd_acceptable()
52 	if (tdentry != exp->ex_path.dentry)  in nfsd_acceptable()
54 	rv = (tdentry == exp->ex_path.dentry);  in nfsd_acceptable()
60  * generally agreed upon. SunOS seems to use EISDIR if file isn't S_IFREG; a
68 	umode_t mode = d_inode(dentry)->i_mode & S_IFMT;  in nfsd_mode_check()
83 	if (rqstp->rq_vers == 4 && mode == S_IFLNK)  in nfsd_mode_check()
96 	/* We don't require gss requests to use low ports: */  in nfsd_originating_port_ok()
97 	if (rqstp->rq_cred.cr_flavor >= RPC_AUTH_GSS)  in nfsd_originating_port_ok()
99 	return test_bit(RQ_SECURE, &rqstp->rq_flags);  in nfsd_originating_port_ok()
122 	if (!(exp->ex_flags & NFSEXP_V4ROOT))  in check_pseudo_root()
125 	 * v2/v3 clients have no need for the V4ROOT export--they use  in check_pseudo_root()
127 	 * in v4-specific code, in which case v2/v3 clients could bypass  in check_pseudo_root()
144 	if (unlikely(dentry != exp->ex_path.dentry))  in check_pseudo_root()
150  * Use the given filehandle to look up the corresponding export and
156 	struct knfsd_fh	*fh = &fhp->fh_handle;  in nfsd_set_fh_dentry()
161 	int data_left = fh->fh_size/4;  in nfsd_set_fh_dentry()
166 	if (rqstp->rq_vers > 2)  in nfsd_set_fh_dentry()
168 	if (rqstp->rq_vers == 4 && fh->fh_size == 0)  in nfsd_set_fh_dentry()
171 	if (fh->fh_version != 1)  in nfsd_set_fh_dentry()
174 	if (--data_left < 0)  in nfsd_set_fh_dentry()
176 	if (fh->fh_auth_type != 0)  in nfsd_set_fh_dentry()
178 	len = key_len(fh->fh_fsid_type) / 4;  in nfsd_set_fh_dentry()
181 	if (fh->fh_fsid_type == FSID_MAJOR_MINOR) {  in nfsd_set_fh_dentry()
184 		fh->fh_fsid_type = FSID_ENCODE_DEV;  in nfsd_set_fh_dentry()
186 		 * struct knfsd_fh uses host-endian fields, which are  in nfsd_set_fh_dentry()
187 		 * sometimes used to hold net-endian values. This  in nfsd_set_fh_dentry()
188 		 * confuses sparse, so we must use __force here to  in nfsd_set_fh_dentry()
191 		fh->fh_fsid[0] = new_encode_dev(MKDEV(ntohl((__force __be32)fh->fh_fsid[0]),  in nfsd_set_fh_dentry()
192 						      ntohl((__force __be32)fh->fh_fsid[1])));  in nfsd_set_fh_dentry()
193 		fh->fh_fsid[1] = fh->fh_fsid[2];  in nfsd_set_fh_dentry()
195 	data_left -= len;  in nfsd_set_fh_dentry()
198 	exp = rqst_exp_find(rqstp, fh->fh_fsid_type, fh->fh_fsid);  in nfsd_set_fh_dentry()
199 	fid = (struct fid *)(fh->fh_fsid + len);  in nfsd_set_fh_dentry()
205 		if (PTR_ERR(exp) == -ENOENT)  in nfsd_set_fh_dentry()
211 	if (exp->ex_flags & NFSEXP_NOSUBTREECHECK) {  in nfsd_set_fh_dentry()
219 		 * fix that case easily.  in nfsd_set_fh_dentry()
223 			error =  nfserrno(-ENOMEM);  in nfsd_set_fh_dentry()
226 		new->cap_effective =  in nfsd_set_fh_dentry()
227 			cap_raise_nfsd_set(new->cap_effective,  in nfsd_set_fh_dentry()
228 					   new->cap_permitted);  in nfsd_set_fh_dentry()
241 	if (rqstp->rq_vers > 2)  in nfsd_set_fh_dentry()
244 	fileid_type = fh->fh_fileid_type;  in nfsd_set_fh_dentry()
247 		dentry = dget(exp->ex_path.dentry);  in nfsd_set_fh_dentry()
249 		dentry = exportfs_decode_fh_raw(exp->ex_path.mnt, fid,  in nfsd_set_fh_dentry()
254 					dentry ?  PTR_ERR(dentry) : -ESTALE);  in nfsd_set_fh_dentry()
256 			case -ENOMEM:  in nfsd_set_fh_dentry()
257 			case -ETIMEDOUT:  in nfsd_set_fh_dentry()
260 				dentry = ERR_PTR(-ESTALE);  in nfsd_set_fh_dentry()
267 		if (PTR_ERR(dentry) != -EINVAL)  in nfsd_set_fh_dentry()
273 			(dentry->d_flags & DCACHE_DISCONNECTED)) {  in nfsd_set_fh_dentry()
278 	fhp->fh_dentry = dentry;  in nfsd_set_fh_dentry()
279 	fhp->fh_export = exp;  in nfsd_set_fh_dentry()
281 	switch (rqstp->rq_vers) {  in nfsd_set_fh_dentry()
282 	case 4:  in nfsd_set_fh_dentry()
283 		if (dentry->d_sb->s_export_op->flags & EXPORT_OP_NOATOMIC_ATTR)  in nfsd_set_fh_dentry()
284 			fhp->fh_no_atomic_attr = true;  in nfsd_set_fh_dentry()
286 	case 3:  in nfsd_set_fh_dentry()
287 		if (dentry->d_sb->s_export_op->flags & EXPORT_OP_NOWCC)  in nfsd_set_fh_dentry()
288 			fhp->fh_no_wcc = true;  in nfsd_set_fh_dentry()
290 	case 2:  in nfsd_set_fh_dentry()
291 		fhp->fh_no_wcc = true;  in nfsd_set_fh_dentry()
301  * fh_verify - filehandle lookup and access checking
307  * Look up a dentry from the on-the-wire filehandle, check the client's
315  * up a dentry using the on-the-wire filehandle.  Subsequent calls will
320  * constants defined in include/linux/stat.h.  The caller may use zero
334 	if (!fhp->fh_dentry) {  in fh_verify()
339 	dentry = fhp->fh_dentry;  in fh_verify()
340 	exp = fhp->fh_export;  in fh_verify()
347 	 * 	- fh_verify may be called multiple times with different  in fh_verify()
351 	 *	- in the NFSv4 case, the filehandle may have been filled  in fh_verify()
354 	 *	  still need permissions checks.  In the worst case, a  in fh_verify()
356 	 *	  options, and we may now need to use a different uid  in fh_verify()
357 	 *	  (for example, if different id-squashing options are in  in fh_verify()
374 	 * which clients virtually always use auth_sys for,  in fh_verify()
380 	 * Clients may expect to be able to use auth_sys during mount,  in fh_verify()
381 	 * even if they use gss for everything else; see section 2.3.2  in fh_verify()
385 			&& exp->ex_path.dentry == dentry)  in fh_verify()
407  * an inode.  In this case a call to fh_update should be made
413 	if (dentry != exp->ex_path.dentry) {  in _fh_update()
415 			(fhp->fh_handle.fh_fsid + fhp->fh_handle.fh_size/4 - 1);  in _fh_update()
416 		int maxsize = (fhp->fh_maxsize - fhp->fh_handle.fh_size)/4;  in _fh_update()
417 		int subtreecheck = !(exp->ex_flags & NFSEXP_NOSUBTREECHECK);  in _fh_update()
419 		fhp->fh_handle.fh_fileid_type =  in _fh_update()
421 		fhp->fh_handle.fh_size += maxsize * 4;  in _fh_update()
423 		fhp->fh_handle.fh_fileid_type = FILEID_ROOT;  in _fh_update()
429 	return exp->ex_path.dentry == exp->ex_path.dentry->d_sb->s_root;  in is_root_export()
434 	return exp->ex_path.dentry->d_sb;  in exp_sb()
440 	case FSID_DEV:  in fsid_type_ok_for_exp()
441 		if (!old_valid_dev(exp_sb(exp)->s_dev))  in fsid_type_ok_for_exp()
444 	case FSID_MAJOR_MINOR:  in fsid_type_ok_for_exp()
445 	case FSID_ENCODE_DEV:  in fsid_type_ok_for_exp()
446 		return exp_sb(exp)->s_type->fs_flags & FS_REQUIRES_DEV;  in fsid_type_ok_for_exp()
447 	case FSID_NUM:  in fsid_type_ok_for_exp()
448 		return exp->ex_flags & NFSEXP_FSID;  in fsid_type_ok_for_exp()
449 	case FSID_UUID8:  in fsid_type_ok_for_exp()
450 	case FSID_UUID16:  in fsid_type_ok_for_exp()
454 	case FSID_UUID4_INUM:  in fsid_type_ok_for_exp()
455 	case FSID_UUID16_INUM:  in fsid_type_ok_for_exp()
456 		return exp->ex_uuid != NULL;  in fsid_type_ok_for_exp()
468 	if (ref_fh && ref_fh->fh_export == exp) {  in set_version_and_fsid_type()
469 		version = ref_fh->fh_handle.fh_version;  in set_version_and_fsid_type()
470 		fsid_type = ref_fh->fh_handle.fh_fsid_type;  in set_version_and_fsid_type()
475 		case 0xca:  in set_version_and_fsid_type()
478 		case 1:  in set_version_and_fsid_type()
485 		 * As the fsid -> filesystem mapping was guided by  in set_version_and_fsid_type()
486 		 * user-space, there is no guarantee that the filesystem  in set_version_and_fsid_type()
492 	} else if (exp->ex_flags & NFSEXP_FSID) {  in set_version_and_fsid_type()
494 	} else if (exp->ex_uuid) {  in set_version_and_fsid_type()
495 		if (fhp->fh_maxsize >= 64) {  in set_version_and_fsid_type()
506 	} else if (!old_valid_dev(exp_sb(exp)->s_dev))  in set_version_and_fsid_type()
507 		/* for newer device numbers, we must use a newer fsid format */  in set_version_and_fsid_type()
511 	fhp->fh_handle.fh_version = version;  in set_version_and_fsid_type()
513 		fhp->fh_handle.fh_fsid_type = fsid_type;  in set_version_and_fsid_type()
521 	 * if it is non-null and for the same filesystem, then we should compose  in fh_compose()
526 	dev_t ex_dev = exp_sb(exp)->s_dev;  in fh_compose()
530 		(long) d_inode(exp->ex_path.dentry)->i_ino,  in fh_compose()
532 		(inode ? inode->i_ino : 0));  in fh_compose()
541 	fhp->fh_no_wcc = ref_fh ? ref_fh->fh_no_wcc : false;  in fh_compose()
546 	if (fhp->fh_dentry) {  in fh_compose()
550 	if (fhp->fh_maxsize < NFS_FHSIZE)  in fh_compose()
552 		       fhp->fh_maxsize,  in fh_compose()
555 	fhp->fh_dentry = dget(dentry); /* our internal copy */  in fh_compose()
556 	fhp->fh_export = exp_get(exp);  in fh_compose()
558 	fhp->fh_handle.fh_size =  in fh_compose()
559 		key_len(fhp->fh_handle.fh_fsid_type) + 4;  in fh_compose()
560 	fhp->fh_handle.fh_auth_type = 0;  in fh_compose()
562 	mk_fsid(fhp->fh_handle.fh_fsid_type,  in fh_compose()
563 		fhp->fh_handle.fh_fsid,  in fh_compose()
565 		d_inode(exp->ex_path.dentry)->i_ino,  in fh_compose()
566 		exp->ex_fsid, exp->ex_uuid);  in fh_compose()
570 	if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID) {  in fh_compose()
587 	if (!fhp->fh_dentry)  in fh_update()
590 	dentry = fhp->fh_dentry;  in fh_update()
593 	if (fhp->fh_handle.fh_fileid_type != FILEID_ROOT)  in fh_update()
596 	_fh_update(fhp, fhp->fh_export, dentry);  in fh_update()
597 	if (fhp->fh_handle.fh_fileid_type == FILEID_INVALID)  in fh_update()
610  * fh_fill_pre_attrs - Fill in pre-op attributes
616 	bool v4 = (fhp->fh_maxsize == NFS4_FHSIZE);  in fh_fill_pre_attrs()
621 	if (fhp->fh_no_wcc || fhp->fh_pre_saved)  in fh_fill_pre_attrs()
624 	inode = d_inode(fhp->fh_dentry);  in fh_fill_pre_attrs()
628 		stat.mtime = inode->i_mtime;  in fh_fill_pre_attrs()
629 		stat.ctime = inode->i_ctime;  in fh_fill_pre_attrs()
630 		stat.size  = inode->i_size;  in fh_fill_pre_attrs()
633 		fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode);  in fh_fill_pre_attrs()
635 	fhp->fh_pre_mtime = stat.mtime;  in fh_fill_pre_attrs()
636 	fhp->fh_pre_ctime = stat.ctime;  in fh_fill_pre_attrs()
637 	fhp->fh_pre_size  = stat.size;  in fh_fill_pre_attrs()
638 	fhp->fh_pre_saved = true;  in fh_fill_pre_attrs()
642  * fh_fill_post_attrs - Fill in post-op attributes
648 	bool v4 = (fhp->fh_maxsize == NFS4_FHSIZE);  in fh_fill_post_attrs()
649 	struct inode *inode = d_inode(fhp->fh_dentry);  in fh_fill_post_attrs()
652 	if (fhp->fh_no_wcc)  in fh_fill_post_attrs()
655 	if (fhp->fh_post_saved)  in fh_fill_post_attrs()
658 	err = fh_getattr(fhp, &fhp->fh_post_attr);  in fh_fill_post_attrs()
660 		fhp->fh_post_saved = false;  in fh_fill_post_attrs()
661 		fhp->fh_post_attr.ctime = inode->i_ctime;  in fh_fill_post_attrs()
663 		fhp->fh_post_saved = true;  in fh_fill_post_attrs()
665 		fhp->fh_post_change =  in fh_fill_post_attrs()
666 			nfsd4_change_attribute(&fhp->fh_post_attr, inode);  in fh_fill_post_attrs()
670  * fh_fill_both_attrs - Fill pre-op and post-op attributes
679 	if (!fhp->fh_post_saved)  in fh_fill_both_attrs()
681 	fhp->fh_pre_change = fhp->fh_post_change;  in fh_fill_both_attrs()
682 	fhp->fh_pre_mtime = fhp->fh_post_attr.mtime;  in fh_fill_both_attrs()
683 	fhp->fh_pre_ctime = fhp->fh_post_attr.ctime;  in fh_fill_both_attrs()
684 	fhp->fh_pre_size = fhp->fh_post_attr.size;  in fh_fill_both_attrs()
685 	fhp->fh_pre_saved = true;  in fh_fill_both_attrs()
694 	struct dentry * dentry = fhp->fh_dentry;  in fh_put()
695 	struct svc_export * exp = fhp->fh_export;  in fh_put()
697 		fhp->fh_dentry = NULL;  in fh_put()
704 		fhp->fh_export = NULL;  in fh_put()
706 	fhp->fh_no_wcc = false;  in fh_put()
715 	struct knfsd_fh *fh = &fhp->fh_handle;  in SVCFH_fmt()
718 	if (fh->fh_size < 0 || fh->fh_size> 64)  in SVCFH_fmt()
719 		return "bad-fh";  in SVCFH_fmt()
720 	sprintf(buf, "%d: %*ph", fh->fh_size, fh->fh_size, fh->fh_raw);  in SVCFH_fmt()
726 	if (fhp->fh_handle.fh_version != 1)  in fsid_source()
728 	switch(fhp->fh_handle.fh_fsid_type) {  in fsid_source()
729 	case FSID_DEV:  in fsid_source()
730 	case FSID_ENCODE_DEV:  in fsid_source()
731 	case FSID_MAJOR_MINOR:  in fsid_source()
732 		if (exp_sb(fhp->fh_export)->s_type->fs_flags & FS_REQUIRES_DEV)  in fsid_source()
735 	case FSID_NUM:  in fsid_source()
736 		if (fhp->fh_export->ex_flags & NFSEXP_FSID)  in fsid_source()
745 	if (fhp->fh_export->ex_flags & NFSEXP_FSID)  in fsid_source()
747 	if (fhp->fh_export->ex_uuid)  in fsid_source()