aboutsummaryrefslogtreecommitdiff
path: root/fs/cifs/cifs_dfs_ref.c
blob: 606f26d862dc18b1326e5c3cf4a9e1c9a746ac70 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *   Contains the CIFS DFS referral mounting routines used for handling
 *   traversal via DFS junction point
 *
 *   Copyright (c) 2007 Igor Mammedov
 *   Copyright (C) International Business Machines  Corp., 2008
 *   Author(s): Igor Mammedov (niallain@gmail.com)
 *		Steve French (sfrench@us.ibm.com)
 */

#include <linux/dcache.h>
#include <linux/mount.h>
#include <linux/namei.h>
#include <linux/slab.h>
#include <linux/vfs.h>
#include <linux/fs.h>
#include <linux/inet.h>
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifsfs.h"
#include "dns_resolve.h"
#include "cifs_debug.h"
#include "cifs_unicode.h"
#include "dfs_cache.h"

static LIST_HEAD(cifs_dfs_automount_list);

static void cifs_dfs_expire_automounts(struct work_struct *work);
static DECLARE_DELAYED_WORK(cifs_dfs_automount_task,
			    cifs_dfs_expire_automounts);
static int cifs_dfs_mountpoint_expiry_timeout = 500 * HZ;

static void cifs_dfs_expire_automounts(struct work_struct *work)
{
	struct list_head *list = &cifs_dfs_automount_list;

	mark_mounts_for_expiry(list);
	if (!list_empty(list))
		schedule_delayed_work(&cifs_dfs_automount_task,
				      cifs_dfs_mountpoint_expiry_timeout);
}

void cifs_dfs_release_automount_timer(void)
{
	BUG_ON(!list_empty(&cifs_dfs_automount_list));
	cancel_delayed_work_sync(&cifs_dfs_automount_task);
}

/**
 * cifs_build_devname - build a devicename from a UNC and optional prepath
 * @nodename:	pointer to UNC string
 * @prepath:	pointer to prefixpath (or NULL if there isn't one)
 *
 * Build a new cifs devicename after chasing a DFS referral. Allocate a buffer
 * big enough to hold the final thing. Copy the UNC from the nodename, and
 * concatenate the prepath onto the end of it if there is one.
 *
 * Returns pointer to the built string, or a ERR_PTR. Caller is responsible
 * for freeing the returned string.
 */
static char *
cifs_build_devname(char *nodename, const char *prepath)
{
	size_t pplen;
	size_t unclen;
	char *dev;
	char *pos;

	/* skip over any preceding delimiters */
	nodename += strspn(nodename, "\\");
	if (!*nodename)
		return ERR_PTR(-EINVAL);

	/* get length of UNC and set pos to last char */
	unclen = strlen(nodename);
	pos = nodename + unclen - 1;

	/* trim off any trailing delimiters */
	while (*pos == '\\') {
		--pos;
		--unclen;
	}

	/* allocate a buffer:
	 * +2 for preceding "//"
	 * +1 for delimiter between UNC and prepath
	 * +1 for trailing NULL
	 */
	pplen = prepath ? strlen(prepath) : 0;
	dev = kmalloc(2 + unclen + 1 + pplen + 1, GFP_KERNEL);
	if (!dev)
		return ERR_PTR(-ENOMEM);

	pos = dev;
	/* add the initial "//" */
	*pos = '/';
	++pos;
	*pos = '/';
	++pos;

	/* copy in the UNC portion from referral */
	memcpy(pos, nodename, unclen);
	pos += unclen;

	/* copy the prefixpath remainder (if there is one) */
	if (pplen) {
		*pos = '/';
		++pos;
		memcpy(pos, prepath, pplen);
		pos += pplen;
	}

	/* NULL terminator */
	*pos = '\0';

	convert_delimiter(dev, '/');
	return dev;
}


/**
 * cifs_compose_mount_options	-	creates mount options for referral
 * @sb_mountdata:	parent/root DFS mount options (template)
 * @fullpath:		full path in UNC format
 * @ref:		optional server's referral
 * @devname:		optional pointer for saving device name
 *
 * creates mount options for submount based on template options sb_mountdata
 * and replacing unc,ip,prefixpath options with ones we've got form ref_unc.
 *
 * Returns: pointer to new mount options or ERR_PTR.
 * Caller is responsible for freeing returned value if it is not error.
 */
char *cifs_compose_mount_options(const char *sb_mountdata,
				   const char *fullpath,
				   const struct dfs_info3_param *ref,
				   char **devname)
{
	int rc;
	char *name;
	char *mountdata = NULL;
	const char *prepath = NULL;
	int md_len;
	char *tkn_e;
	char *srvIP = NULL;
	char sep = ',';
	int off, noff;

	if (sb_mountdata == NULL)
		return ERR_PTR(-EINVAL);

	if (ref) {
		if (strlen(fullpath) - ref->path_consumed) {
			prepath = fullpath + ref->path_consumed;
			/* skip initial delimiter */
			if (*prepath == '/' || *prepath == '\\')
				prepath++;
		}

		name = cifs_build_devname(ref->node_name, prepath);
		if (IS_ERR(name)) {
			rc = PTR_ERR(name);
			name = NULL;
			goto compose_mount_options_err;
		}
	} else {
		name = cifs_build_devname((char *)fullpath, NULL);
		if (IS_ERR(name)) {
			rc = PTR_ERR(name);
			name = NULL;
			goto compose_mount_options_err;
		}
	}

	rc = dns_resolve_server_name_to_ip(name, &srvIP);
	if (rc < 0) {
		cifs_dbg(FYI, "%s: Failed to resolve server part of %s to IP: %d\n",
			 __func__, name, rc);
		goto compose_mount_options_err;
	}

	/*
	 * In most cases, we'll be building a shorter string than the original,
	 * but we do have to assume that the address in the ip= option may be
	 * much longer than the original. Add the max length of an address
	 * string to the length of the original string to allow for worst case.
	 */
	md_len = strlen(sb_mountdata) + INET6_ADDRSTRLEN;
	mountdata = kzalloc(md_len + sizeof("ip=") + 1, GFP_KERNEL);
	if (mountdata == NULL) {
		rc = -ENOMEM;
		goto compose_mount_options_err;
	}

	/* copy all options except of unc,ip,prefixpath */
	off = 0;
	if (strncmp(sb_mountdata, "sep=", 4) == 0) {
			sep = sb_mountdata[4];
			strncpy(mountdata, sb_mountdata, 5);
			off += 5;
	}

	do {
		tkn_e = strchr(sb_mountdata + off, sep);
		if (tkn_e == NULL)
			noff = strlen(sb_mountdata + off);
		else
			noff = tkn_e - (sb_mountdata + off) + 1;

		if (strncasecmp(sb_mountdata + off, "unc=", 4) == 0) {
			off += noff;
			continue;
		}
		if (strncasecmp(sb_mountdata + off, "ip=", 3) == 0) {
			off += noff;
			continue;
		}
		if (strncasecmp(sb_mountdata + off, "prefixpath=", 11) == 0) {
			off += noff;
			continue;
		}
		strncat(mountdata, sb_mountdata + off, noff);
		off += noff;
	} while (tkn_e);
	strcat(mountdata, sb_mountdata + off);
	mountdata[md_len] = '\0';

	/* copy new IP and ref share name */
	if (mountdata[strlen(mountdata) - 1] != sep)
		strncat(mountdata, &sep, 1);
	strcat(mountdata, "ip=");
	strcat(mountdata, srvIP);

	if (devname)
		*devname = name;
	else
		kfree(name);

	/*cifs_dbg(FYI, "%s: parent mountdata: %s\n", __func__, sb_mountdata);*/
	/*cifs_dbg(FYI, "%s: submount mountdata: %s\n", __func__, mountdata );*/

compose_mount_options_out:
	kfree(srvIP);
	return mountdata;

compose_mount_options_err:
	kfree(mountdata);
	mountdata = ERR_PTR(rc);
	kfree(name);
	goto compose_mount_options_out;
}

/**
 * cifs_dfs_do_mount - mounts specified path using DFS full path
 *
 * Always pass down @fullpath to smb3_do_mount() so we can use the root server
 * to perform failover in case we failed to connect to the first target in the
 * referral.
 *
 * @cifs_sb:		parent/root superblock
 * @fullpath:		full path in UNC format
 */
static struct vfsmount *cifs_dfs_do_mount(struct dentry *mntpt,
					  struct cifs_sb_info *cifs_sb,
					  const char *fullpath)
{
	struct vfsmount *mnt;
	char *mountdata;
	char *devname;

	devname = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
	if (!devname)
		return ERR_PTR(-ENOMEM);

	convert_delimiter(devname, '/');

	/* strip first '\' from fullpath */
	mountdata = cifs_compose_mount_options(cifs_sb->mountdata,
					       fullpath + 1, NULL, NULL);
	if (IS_ERR(mountdata)) {
		kfree(devname);
		return (struct vfsmount *)mountdata;
	}

	mnt = vfs_submount(mntpt, &cifs_fs_type, devname, mountdata);
	kfree(mountdata);
	kfree(devname);
	return mnt;
}

/*
 * Create a vfsmount that we can automount
 */
static struct vfsmount *cifs_dfs_do_automount(struct dentry *mntpt)
{
	struct cifs_sb_info *cifs_sb;
	struct cifs_ses *ses;
	struct cifs_tcon *tcon;
	char *full_path, *root_path;
	unsigned int xid;
	int rc;
	struct vfsmount *mnt;

	cifs_dbg(FYI, "in %s\n", __func__);
	BUG_ON(IS_ROOT(mntpt));

	/*
	 * The MSDFS spec states that paths in DFS referral requests and
	 * responses must be prefixed by a single '\' character instead of
	 * the double backslashes usually used in the UNC. This function
	 * gives us the latter, so we must adjust the result.
	 */
	mnt = ERR_PTR(-ENOMEM);

	cifs_sb = CIFS_SB(mntpt->d_sb);
	if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) {
		mnt = ERR_PTR(-EREMOTE);
		goto cdda_exit;
	}

	/* always use tree name prefix */
	full_path = build_path_from_dentry_optional_prefix(mntpt, true);
	if (full_path == NULL)
		goto cdda_exit;

	cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);

	if (!cifs_sb_master_tlink(cifs_sb)) {
		cifs_dbg(FYI, "%s: master tlink is NULL\n", __func__);
		goto free_full_path;
	}

	tcon = cifs_sb_master_tcon(cifs_sb);
	if (!tcon) {
		cifs_dbg(FYI, "%s: master tcon is NULL\n", __func__);
		goto free_full_path;
	}

	root_path = kstrdup(tcon->treeName, GFP_KERNEL);
	if (!root_path) {
		mnt = ERR_PTR(-ENOMEM);
		goto free_full_path;
	}
	cifs_dbg(FYI, "%s: root path: %s\n", __func__, root_path);

	ses = tcon->ses;
	xid = get_xid();

	/*
	 * If DFS root has been expired, then unconditionally fetch it again to
	 * refresh DFS referral cache.
	 */
	rc = dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
			    root_path + 1, NULL, NULL);
	if (!rc) {
		rc = dfs_cache_find(xid, ses, cifs_sb->local_nls,
				    cifs_remap(cifs_sb), full_path + 1,
				    NULL, NULL);
	}

	free_xid(xid);

	if (rc) {
		mnt = ERR_PTR(rc);
		goto free_root_path;
	}
	/*
	 * OK - we were able to get and cache a referral for @full_path.
	 *
	 * Now, pass it down to cifs_mount() and it will retry every available
	 * node server in case of failures - no need to do it here.
	 */
	mnt = cifs_dfs_do_mount(mntpt, cifs_sb, full_path);
	cifs_dbg(FYI, "%s: cifs_dfs_do_mount:%s , mnt:%p\n", __func__,
		 full_path + 1, mnt);

free_root_path:
	kfree(root_path);
free_full_path:
	kfree(full_path);
cdda_exit:
	cifs_dbg(FYI, "leaving %s\n" , __func__);
	return mnt;
}

/*
 * Attempt to automount the referral
 */
struct vfsmount *cifs_dfs_d_automount(struct path *path)
{
	struct vfsmount *newmnt;

	cifs_dbg(FYI, "in %s\n", __func__);

	newmnt = cifs_dfs_do_automount(path->dentry);
	if (IS_ERR(newmnt)) {
		cifs_dbg(FYI, "leaving %s [automount failed]\n" , __func__);
		return newmnt;
	}

	mntget(newmnt); /* prevent immediate expiration */
	mnt_set_expiry(newmnt, &cifs_dfs_automount_list);
	schedule_delayed_work(&cifs_dfs_automount_task,
			      cifs_dfs_mountpoint_expiry_timeout);
	cifs_dbg(FYI, "leaving %s [ok]\n" , __func__);
	return newmnt;
}

const struct inode_operations cifs_dfs_referral_inode_operations = {
};