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fs_context.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2020, Microsoft Corporation.
*
* Author(s): Steve French <[email protected]>
* David Howells <[email protected]>
*/
/*
#include <linux/module.h>
#include <linux/nsproxy.h>
#include <linux/slab.h>
#include <linux/magic.h>
#include <linux/security.h>
#include <net/net_namespace.h>
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif
*/
#include <linux/ctype.h>
#include <linux/fs_context.h>
#include <linux/fs_parser.h>
#include <linux/fs.h>
#include <linux/mount.h>
#include <linux/parser.h>
#include <linux/utsname.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "cifs_fs_sb.h"
#include "ntlmssp.h"
#include "nterr.h"
#include "rfc1002pdu.h"
#include "fs_context.h"
static DEFINE_MUTEX(cifs_mount_mutex);
static const match_table_t cifs_smb_version_tokens = {
{ Smb_1, SMB1_VERSION_STRING },
{ Smb_20, SMB20_VERSION_STRING},
{ Smb_21, SMB21_VERSION_STRING },
{ Smb_30, SMB30_VERSION_STRING },
{ Smb_302, SMB302_VERSION_STRING },
{ Smb_302, ALT_SMB302_VERSION_STRING },
{ Smb_311, SMB311_VERSION_STRING },
{ Smb_311, ALT_SMB311_VERSION_STRING },
{ Smb_3any, SMB3ANY_VERSION_STRING },
{ Smb_default, SMBDEFAULT_VERSION_STRING },
{ Smb_version_err, NULL }
};
static const match_table_t cifs_secflavor_tokens = {
{ Opt_sec_krb5, "krb5" },
{ Opt_sec_krb5i, "krb5i" },
{ Opt_sec_krb5p, "krb5p" },
{ Opt_sec_ntlmsspi, "ntlmsspi" },
{ Opt_sec_ntlmssp, "ntlmssp" },
{ Opt_sec_ntlmv2, "nontlm" },
{ Opt_sec_ntlmv2, "ntlmv2" },
{ Opt_sec_ntlmv2i, "ntlmv2i" },
{ Opt_sec_none, "none" },
{ Opt_sec_err, NULL }
};
const struct fs_parameter_spec smb3_fs_parameters[] = {
/* Mount options that take no arguments */
fsparam_flag_no("user_xattr", Opt_user_xattr),
fsparam_flag_no("forceuid", Opt_forceuid),
fsparam_flag_no("multichannel", Opt_multichannel),
fsparam_flag_no("forcegid", Opt_forcegid),
fsparam_flag("noblocksend", Opt_noblocksend),
fsparam_flag("noautotune", Opt_noautotune),
fsparam_flag("nolease", Opt_nolease),
fsparam_flag_no("hard", Opt_hard),
fsparam_flag_no("soft", Opt_soft),
fsparam_flag_no("perm", Opt_perm),
fsparam_flag("nodelete", Opt_nodelete),
fsparam_flag_no("mapposix", Opt_mapposix),
fsparam_flag("mapchars", Opt_mapchars),
fsparam_flag("nomapchars", Opt_nomapchars),
fsparam_flag_no("sfu", Opt_sfu),
fsparam_flag("nodfs", Opt_nodfs),
fsparam_flag_no("posixpaths", Opt_posixpaths),
fsparam_flag_no("unix", Opt_unix),
fsparam_flag_no("linux", Opt_unix),
fsparam_flag_no("posix", Opt_unix),
fsparam_flag("nocase", Opt_nocase),
fsparam_flag("ignorecase", Opt_nocase),
fsparam_flag_no("brl", Opt_brl),
fsparam_flag_no("handlecache", Opt_handlecache),
fsparam_flag("forcemandatorylock", Opt_forcemandatorylock),
fsparam_flag("forcemand", Opt_forcemandatorylock),
fsparam_flag("setuidfromacl", Opt_setuidfromacl),
fsparam_flag("idsfromsid", Opt_setuidfromacl),
fsparam_flag_no("setuids", Opt_setuids),
fsparam_flag_no("dynperm", Opt_dynperm),
fsparam_flag_no("intr", Opt_intr),
fsparam_flag_no("strictsync", Opt_strictsync),
fsparam_flag_no("serverino", Opt_serverino),
fsparam_flag("rwpidforward", Opt_rwpidforward),
fsparam_flag("cifsacl", Opt_cifsacl),
fsparam_flag_no("acl", Opt_acl),
fsparam_flag("locallease", Opt_locallease),
fsparam_flag("sign", Opt_sign),
fsparam_flag("ignore_signature", Opt_ignore_signature),
fsparam_flag("signloosely", Opt_ignore_signature),
fsparam_flag("seal", Opt_seal),
fsparam_flag("noac", Opt_noac),
fsparam_flag("fsc", Opt_fsc),
fsparam_flag("mfsymlinks", Opt_mfsymlinks),
fsparam_flag("multiuser", Opt_multiuser),
fsparam_flag("sloppy", Opt_sloppy),
fsparam_flag("nosharesock", Opt_nosharesock),
fsparam_flag_no("persistenthandles", Opt_persistent),
fsparam_flag_no("resilienthandles", Opt_resilient),
fsparam_flag_no("tcpnodelay", Opt_tcp_nodelay),
fsparam_flag("nosparse", Opt_nosparse),
fsparam_flag("domainauto", Opt_domainauto),
fsparam_flag("rdma", Opt_rdma),
fsparam_flag("modesid", Opt_modesid),
fsparam_flag("modefromsid", Opt_modesid),
fsparam_flag("rootfs", Opt_rootfs),
fsparam_flag("compress", Opt_compress),
fsparam_flag("witness", Opt_witness),
/* Mount options which take numeric value */
fsparam_u32("backupuid", Opt_backupuid),
fsparam_u32("backupgid", Opt_backupgid),
fsparam_u32("uid", Opt_uid),
fsparam_u32("cruid", Opt_cruid),
fsparam_u32("gid", Opt_gid),
fsparam_u32("file_mode", Opt_file_mode),
fsparam_u32("dirmode", Opt_dirmode),
fsparam_u32("dir_mode", Opt_dirmode),
fsparam_u32("port", Opt_port),
fsparam_u32("min_enc_offload", Opt_min_enc_offload),
fsparam_u32("esize", Opt_min_enc_offload),
fsparam_u32("bsize", Opt_blocksize),
fsparam_u32("rasize", Opt_rasize),
fsparam_u32("rsize", Opt_rsize),
fsparam_u32("wsize", Opt_wsize),
fsparam_u32("actimeo", Opt_actimeo),
fsparam_u32("acdirmax", Opt_acdirmax),
fsparam_u32("acregmax", Opt_acregmax),
fsparam_u32("echo_interval", Opt_echo_interval),
fsparam_u32("max_credits", Opt_max_credits),
fsparam_u32("handletimeout", Opt_handletimeout),
fsparam_u64("snapshot", Opt_snapshot),
fsparam_u32("max_channels", Opt_max_channels),
/* Mount options which take string value */
fsparam_string("source", Opt_source),
fsparam_string("user", Opt_user),
fsparam_string("username", Opt_user),
fsparam_string("pass", Opt_pass),
fsparam_string("password", Opt_pass),
fsparam_string("ip", Opt_ip),
fsparam_string("addr", Opt_ip),
fsparam_string("domain", Opt_domain),
fsparam_string("dom", Opt_domain),
fsparam_string("srcaddr", Opt_srcaddr),
fsparam_string("iocharset", Opt_iocharset),
fsparam_string("netbiosname", Opt_netbiosname),
fsparam_string("servern", Opt_servern),
fsparam_string("ver", Opt_ver),
fsparam_string("vers", Opt_vers),
fsparam_string("sec", Opt_sec),
fsparam_string("cache", Opt_cache),
/* Arguments that should be ignored */
fsparam_flag("guest", Opt_ignore),
fsparam_flag("noatime", Opt_ignore),
fsparam_flag("relatime", Opt_ignore),
fsparam_flag("_netdev", Opt_ignore),
fsparam_flag_no("suid", Opt_ignore),
fsparam_flag_no("exec", Opt_ignore),
fsparam_flag_no("dev", Opt_ignore),
fsparam_flag_no("mand", Opt_ignore),
fsparam_flag_no("auto", Opt_ignore),
fsparam_string("cred", Opt_ignore),
fsparam_string("credentials", Opt_ignore),
/*
* UNC and prefixpath is now extracted from Opt_source
* in the new mount API so we can just ignore them going forward.
*/
fsparam_string("unc", Opt_ignore),
fsparam_string("prefixpath", Opt_ignore),
{}
};
static int
cifs_parse_security_flavors(struct fs_context *fc, char *value, struct smb3_fs_context *ctx)
{
substring_t args[MAX_OPT_ARGS];
/*
* With mount options, the last one should win. Reset any existing
* settings back to default.
*/
ctx->sectype = Unspecified;
ctx->sign = false;
switch (match_token(value, cifs_secflavor_tokens, args)) {
case Opt_sec_krb5p:
cifs_errorf(fc, "sec=krb5p is not supported!\n");
return 1;
case Opt_sec_krb5i:
ctx->sign = true;
fallthrough;
case Opt_sec_krb5:
ctx->sectype = Kerberos;
break;
case Opt_sec_ntlmsspi:
ctx->sign = true;
fallthrough;
case Opt_sec_ntlmssp:
ctx->sectype = RawNTLMSSP;
break;
case Opt_sec_ntlmv2i:
ctx->sign = true;
fallthrough;
case Opt_sec_ntlmv2:
ctx->sectype = NTLMv2;
break;
case Opt_sec_none:
ctx->nullauth = 1;
break;
default:
cifs_errorf(fc, "bad security option: %s\n", value);
return 1;
}
return 0;
}
static const match_table_t cifs_cacheflavor_tokens = {
{ Opt_cache_loose, "loose" },
{ Opt_cache_strict, "strict" },
{ Opt_cache_none, "none" },
{ Opt_cache_ro, "ro" },
{ Opt_cache_rw, "singleclient" },
{ Opt_cache_err, NULL }
};
static int
cifs_parse_cache_flavor(struct fs_context *fc, char *value, struct smb3_fs_context *ctx)
{
substring_t args[MAX_OPT_ARGS];
switch (match_token(value, cifs_cacheflavor_tokens, args)) {
case Opt_cache_loose:
ctx->direct_io = false;
ctx->strict_io = false;
ctx->cache_ro = false;
ctx->cache_rw = false;
break;
case Opt_cache_strict:
ctx->direct_io = false;
ctx->strict_io = true;
ctx->cache_ro = false;
ctx->cache_rw = false;
break;
case Opt_cache_none:
ctx->direct_io = true;
ctx->strict_io = false;
ctx->cache_ro = false;
ctx->cache_rw = false;
break;
case Opt_cache_ro:
ctx->direct_io = false;
ctx->strict_io = false;
ctx->cache_ro = true;
ctx->cache_rw = false;
break;
case Opt_cache_rw:
ctx->direct_io = false;
ctx->strict_io = false;
ctx->cache_ro = false;
ctx->cache_rw = true;
break;
default:
cifs_errorf(fc, "bad cache= option: %s\n", value);
return 1;
}
return 0;
}
#define DUP_CTX_STR(field) \
do { \
if (ctx->field) { \
new_ctx->field = kstrdup(ctx->field, GFP_ATOMIC); \
if (new_ctx->field == NULL) { \
smb3_cleanup_fs_context_contents(new_ctx); \
return -ENOMEM; \
} \
} \
} while (0)
int
smb3_fs_context_dup(struct smb3_fs_context *new_ctx, struct smb3_fs_context *ctx)
{
memcpy(new_ctx, ctx, sizeof(*ctx));
new_ctx->prepath = NULL;
new_ctx->mount_options = NULL;
new_ctx->nodename = NULL;
new_ctx->username = NULL;
new_ctx->password = NULL;
new_ctx->server_hostname = NULL;
new_ctx->domainname = NULL;
new_ctx->UNC = NULL;
new_ctx->source = NULL;
new_ctx->iocharset = NULL;
/*
* Make sure to stay in sync with smb3_cleanup_fs_context_contents()
*/
DUP_CTX_STR(prepath);
DUP_CTX_STR(mount_options);
DUP_CTX_STR(username);
DUP_CTX_STR(password);
DUP_CTX_STR(server_hostname);
DUP_CTX_STR(UNC);
DUP_CTX_STR(source);
DUP_CTX_STR(domainname);
DUP_CTX_STR(nodename);
DUP_CTX_STR(iocharset);
return 0;
}
static int
cifs_parse_smb_version(struct fs_context *fc, char *value, struct smb3_fs_context *ctx, bool is_smb3)
{
substring_t args[MAX_OPT_ARGS];
switch (match_token(value, cifs_smb_version_tokens, args)) {
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
case Smb_1:
if (disable_legacy_dialects) {
cifs_errorf(fc, "mount with legacy dialect disabled\n");
return 1;
}
if (is_smb3) {
cifs_errorf(fc, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
return 1;
}
cifs_errorf(fc, "Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers\n");
ctx->ops = &smb1_operations;
ctx->vals = &smb1_values;
break;
case Smb_20:
if (disable_legacy_dialects) {
cifs_errorf(fc, "mount with legacy dialect disabled\n");
return 1;
}
if (is_smb3) {
cifs_errorf(fc, "vers=2.0 not permitted when mounting with smb3\n");
return 1;
}
ctx->ops = &smb20_operations;
ctx->vals = &smb20_values;
break;
#else
case Smb_1:
cifs_errorf(fc, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n");
return 1;
case Smb_20:
cifs_errorf(fc, "vers=2.0 mount not permitted when legacy dialects disabled\n");
return 1;
#endif /* CIFS_ALLOW_INSECURE_LEGACY */
case Smb_21:
ctx->ops = &smb21_operations;
ctx->vals = &smb21_values;
break;
case Smb_30:
ctx->ops = &smb30_operations;
ctx->vals = &smb30_values;
break;
case Smb_302:
ctx->ops = &smb30_operations; /* currently identical with 3.0 */
ctx->vals = &smb302_values;
break;
case Smb_311:
ctx->ops = &smb311_operations;
ctx->vals = &smb311_values;
break;
case Smb_3any:
ctx->ops = &smb30_operations; /* currently identical with 3.0 */
ctx->vals = &smb3any_values;
break;
case Smb_default:
ctx->ops = &smb30_operations;
ctx->vals = &smbdefault_values;
break;
default:
cifs_errorf(fc, "Unknown vers= option specified: %s\n", value);
return 1;
}
return 0;
}
int smb3_parse_opt(const char *options, const char *key, char **val)
{
int rc = -ENOENT;
char *opts, *orig, *p;
orig = opts = kstrdup(options, GFP_KERNEL);
if (!opts)
return -ENOMEM;
while ((p = strsep(&opts, ","))) {
char *nval;
if (!*p)
continue;
if (strncasecmp(p, key, strlen(key)))
continue;
nval = strchr(p, '=');
if (nval) {
if (nval == p)
continue;
*nval++ = 0;
*val = kstrdup(nval, GFP_KERNEL);
rc = !*val ? -ENOMEM : 0;
goto out;
}
}
out:
kfree(orig);
return rc;
}
/*
* Remove duplicate path delimiters. Windows is supposed to do that
* but there are some bugs that prevent rename from working if there are
* multiple delimiters.
*
* Returns a sanitized duplicate of @path. The caller is responsible for
* cleaning up the original.
*/
#define IS_DELIM(c) ((c) == '/' || (c) == '\\')
static char *sanitize_path(char *path)
{
char *cursor1 = path, *cursor2 = path;
/* skip all prepended delimiters */
while (IS_DELIM(*cursor1))
cursor1++;
/* copy the first letter */
*cursor2 = *cursor1;
/* copy the remainder... */
while (*(cursor1++)) {
/* ... skipping all duplicated delimiters */
if (IS_DELIM(*cursor1) && IS_DELIM(*cursor2))
continue;
*(++cursor2) = *cursor1;
}
/* if the last character is a delimiter, skip it */
if (IS_DELIM(*(cursor2 - 1)))
cursor2--;
*(cursor2) = '\0';
return kstrdup(path, GFP_KERNEL);
}
/*
* Parse a devname into substrings and populate the ctx->UNC and ctx->prepath
* fields with the result. Returns 0 on success and an error otherwise
* (e.g. ENOMEM or EINVAL)
*/
int
smb3_parse_devname(const char *devname, struct smb3_fs_context *ctx)
{
char *pos;
const char *delims = "/\\";
size_t len;
if (unlikely(!devname || !*devname)) {
cifs_dbg(VFS, "Device name not specified\n");
return -EINVAL;
}
/* make sure we have a valid UNC double delimiter prefix */
len = strspn(devname, delims);
if (len != 2)
return -EINVAL;
/* find delimiter between host and sharename */
pos = strpbrk(devname + 2, delims);
if (!pos)
return -EINVAL;
/* record the server hostname */
kfree(ctx->server_hostname);
ctx->server_hostname = kstrndup(devname + 2, pos - devname - 2, GFP_KERNEL);
if (!ctx->server_hostname)
return -ENOMEM;
/* skip past delimiter */
++pos;
/* now go until next delimiter or end of string */
len = strcspn(pos, delims);
/* move "pos" up to delimiter or NULL */
pos += len;
kfree(ctx->UNC);
ctx->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
if (!ctx->UNC)
return -ENOMEM;
convert_delimiter(ctx->UNC, '\\');
/* skip any delimiter */
if (*pos == '/' || *pos == '\\')
pos++;
kfree(ctx->prepath);
ctx->prepath = NULL;
/* If pos is NULL then no prepath */
if (!*pos)
return 0;
ctx->prepath = sanitize_path(pos);
if (!ctx->prepath)
return -ENOMEM;
return 0;
}
static void smb3_fs_context_free(struct fs_context *fc);
static int smb3_fs_context_parse_param(struct fs_context *fc,
struct fs_parameter *param);
static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
void *data);
static int smb3_get_tree(struct fs_context *fc);
static int smb3_reconfigure(struct fs_context *fc);
static const struct fs_context_operations smb3_fs_context_ops = {
.free = smb3_fs_context_free,
.parse_param = smb3_fs_context_parse_param,
.parse_monolithic = smb3_fs_context_parse_monolithic,
.get_tree = smb3_get_tree,
.reconfigure = smb3_reconfigure,
};
/*
* Parse a monolithic block of data from sys_mount().
* smb3_fs_context_parse_monolithic - Parse key[=val][,key[=val]]* mount data
* @ctx: The superblock configuration to fill in.
* @data: The data to parse
*
* Parse a blob of data that's in key[=val][,key[=val]]* form. This can be
* called from the ->monolithic_mount_data() fs_context operation.
*
* Returns 0 on success or the error returned by the ->parse_option() fs_context
* operation on failure.
*/
static int smb3_fs_context_parse_monolithic(struct fs_context *fc,
void *data)
{
struct smb3_fs_context *ctx = smb3_fc2context(fc);
char *options = data, *key;
int ret = 0;
if (!options)
return 0;
ctx->mount_options = kstrdup(data, GFP_KERNEL);
if (ctx->mount_options == NULL)
return -ENOMEM;
ret = security_sb_eat_lsm_opts(options, &fc->security);
if (ret)
return ret;
/* BB Need to add support for sep= here TBD */
while ((key = strsep(&options, ",")) != NULL) {
size_t len;
char *value;
if (*key == 0)
break;
/* Check if following character is the deliminator If yes,
* we have encountered a double deliminator reset the NULL
* character to the deliminator
*/
while (options && options[0] == ',') {
len = strlen(key);
strcpy(key + len, options);
options = strchr(options, ',');
if (options)
*options++ = 0;
}
len = 0;
value = strchr(key, '=');
if (value) {
if (value == key)
continue;
*value++ = 0;
len = strlen(value);
}
ret = vfs_parse_fs_string(fc, key, value, len);
if (ret < 0)
break;
}
return ret;
}
/*
* Validate the preparsed information in the config.
*/
static int smb3_fs_context_validate(struct fs_context *fc)
{
struct smb3_fs_context *ctx = smb3_fc2context(fc);
if (ctx->rdma && ctx->vals->protocol_id < SMB30_PROT_ID) {
cifs_errorf(fc, "SMB Direct requires Version >=3.0\n");
return -EOPNOTSUPP;
}
#ifndef CONFIG_KEYS
/* Muliuser mounts require CONFIG_KEYS support */
if (ctx->multiuser) {
cifs_errorf(fc, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
return -1;
}
#endif
if (ctx->got_version == false)
pr_warn_once("No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3.1.1), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3.1.1 (or even SMB3 or SMB2.1) specify vers=1.0 on mount.\n");
if (!ctx->UNC) {
cifs_errorf(fc, "CIFS mount error: No usable UNC path provided in device string!\n");
return -1;
}
/* make sure UNC has a share name */
if (strlen(ctx->UNC) < 3 || !strchr(ctx->UNC + 3, '\\')) {
cifs_errorf(fc, "Malformed UNC. Unable to find share name.\n");
return -ENOENT;
}
if (!ctx->got_ip) {
int len;
const char *slash;
/* No ip= option specified? Try to get it from UNC */
/* Use the address part of the UNC. */
slash = strchr(&ctx->UNC[2], '\\');
len = slash - &ctx->UNC[2];
if (!cifs_convert_address((struct sockaddr *)&ctx->dstaddr,
&ctx->UNC[2], len)) {
pr_err("Unable to determine destination address\n");
return -EHOSTUNREACH;
}
}
/* set the port that we got earlier */
cifs_set_port((struct sockaddr *)&ctx->dstaddr, ctx->port);
if (ctx->override_uid && !ctx->uid_specified) {
ctx->override_uid = 0;
pr_notice("ignoring forceuid mount option specified with no uid= option\n");
}
if (ctx->override_gid && !ctx->gid_specified) {
ctx->override_gid = 0;
pr_notice("ignoring forcegid mount option specified with no gid= option\n");
}
return 0;
}
static int smb3_get_tree_common(struct fs_context *fc)
{
struct smb3_fs_context *ctx = smb3_fc2context(fc);
struct dentry *root;
int rc = 0;
root = cifs_smb3_do_mount(fc->fs_type, 0, ctx);
if (IS_ERR(root))
return PTR_ERR(root);
fc->root = root;
return rc;
}
/*
* Create an SMB3 superblock from the parameters passed.
*/
static int smb3_get_tree(struct fs_context *fc)
{
int err = smb3_fs_context_validate(fc);
int ret;
if (err)
return err;
mutex_lock(&cifs_mount_mutex);
ret = smb3_get_tree_common(fc);
mutex_unlock(&cifs_mount_mutex);
return ret;
}
static void smb3_fs_context_free(struct fs_context *fc)
{
struct smb3_fs_context *ctx = smb3_fc2context(fc);
smb3_cleanup_fs_context(ctx);
}
/*
* Compare the old and new proposed context during reconfigure
* and check if the changes are compatible.
*/
static int smb3_verify_reconfigure_ctx(struct fs_context *fc,
struct smb3_fs_context *new_ctx,
struct smb3_fs_context *old_ctx)
{
if (new_ctx->posix_paths != old_ctx->posix_paths) {
cifs_errorf(fc, "can not change posixpaths during remount\n");
return -EINVAL;
}
if (new_ctx->sectype != old_ctx->sectype) {
cifs_errorf(fc, "can not change sec during remount\n");
return -EINVAL;
}
if (new_ctx->multiuser != old_ctx->multiuser) {
cifs_errorf(fc, "can not change multiuser during remount\n");
return -EINVAL;
}
if (new_ctx->UNC &&
(!old_ctx->UNC || strcmp(new_ctx->UNC, old_ctx->UNC))) {
cifs_errorf(fc, "can not change UNC during remount\n");
return -EINVAL;
}
if (new_ctx->username &&
(!old_ctx->username || strcmp(new_ctx->username, old_ctx->username))) {
cifs_errorf(fc, "can not change username during remount\n");
return -EINVAL;
}
if (new_ctx->password &&
(!old_ctx->password || strcmp(new_ctx->password, old_ctx->password))) {
cifs_errorf(fc, "can not change password during remount\n");
return -EINVAL;
}
if (new_ctx->domainname &&
(!old_ctx->domainname || strcmp(new_ctx->domainname, old_ctx->domainname))) {
cifs_errorf(fc, "can not change domainname during remount\n");
return -EINVAL;
}
if (strcmp(new_ctx->workstation_name, old_ctx->workstation_name)) {
cifs_errorf(fc, "can not change workstation_name during remount\n");
return -EINVAL;
}
if (new_ctx->nodename &&
(!old_ctx->nodename || strcmp(new_ctx->nodename, old_ctx->nodename))) {
cifs_errorf(fc, "can not change nodename during remount\n");
return -EINVAL;
}
if (new_ctx->iocharset &&
(!old_ctx->iocharset || strcmp(new_ctx->iocharset, old_ctx->iocharset))) {
cifs_errorf(fc, "can not change iocharset during remount\n");
return -EINVAL;
}
return 0;
}
#define STEAL_STRING(cifs_sb, ctx, field) \
do { \
kfree(ctx->field); \
ctx->field = cifs_sb->ctx->field; \
cifs_sb->ctx->field = NULL; \
} while (0)
static int smb3_reconfigure(struct fs_context *fc)
{
struct smb3_fs_context *ctx = smb3_fc2context(fc);
struct dentry *root = fc->root;
struct cifs_sb_info *cifs_sb = CIFS_SB(root->d_sb);
int rc;
rc = smb3_verify_reconfigure_ctx(fc, ctx, cifs_sb->ctx);
if (rc)
return rc;
/*
* We can not change UNC/username/password/domainname/
* workstation_name/nodename/iocharset
* during reconnect so ignore what we have in the new context and
* just use what we already have in cifs_sb->ctx.
*/
STEAL_STRING(cifs_sb, ctx, UNC);
STEAL_STRING(cifs_sb, ctx, source);
STEAL_STRING(cifs_sb, ctx, username);
STEAL_STRING(cifs_sb, ctx, password);
STEAL_STRING(cifs_sb, ctx, domainname);
STEAL_STRING(cifs_sb, ctx, nodename);
STEAL_STRING(cifs_sb, ctx, iocharset);
/* if rsize or wsize not passed in on remount, use previous values */
if (ctx->rsize == 0)
ctx->rsize = cifs_sb->ctx->rsize;
if (ctx->wsize == 0)
ctx->wsize = cifs_sb->ctx->wsize;
smb3_cleanup_fs_context_contents(cifs_sb->ctx);
rc = smb3_fs_context_dup(cifs_sb->ctx, ctx);
smb3_update_mnt_flags(cifs_sb);
#ifdef CONFIG_CIFS_DFS_UPCALL
if (!rc)
rc = dfs_cache_remount_fs(cifs_sb);
#endif
return rc;
}
static int smb3_fs_context_parse_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct fs_parse_result result;
struct smb3_fs_context *ctx = smb3_fc2context(fc);
int i, opt;
bool is_smb3 = !strcmp(fc->fs_type->name, "smb3");
bool skip_parsing = false;
kuid_t uid;
kgid_t gid;
cifs_dbg(FYI, "CIFS: parsing cifs mount option '%s'\n", param->key);
/*
* fs_parse can not handle string options with an empty value so
* we will need special handling of them.
*/
if (param->type == fs_value_is_string && param->string[0] == 0) {
if (!strcmp("pass", param->key) || !strcmp("password", param->key)) {
skip_parsing = true;
opt = Opt_pass;
} else if (!strcmp("user", param->key) || !strcmp("username", param->key)) {
skip_parsing = true;
opt = Opt_user;
}
}
if (!skip_parsing) {
opt = fs_parse(fc, smb3_fs_parameters, param, &result);
if (opt < 0)
return ctx->sloppy ? 1 : opt;
}
switch (opt) {
case Opt_compress:
ctx->compression = UNKNOWN_TYPE;
cifs_dbg(VFS,
"SMB3 compression support is experimental\n");
break;
case Opt_nodfs:
ctx->nodfs = 1;
break;
case Opt_hard:
if (result.negated)
ctx->retry = 0;
else
ctx->retry = 1;
break;
case Opt_soft:
if (result.negated)
ctx->retry = 1;
else
ctx->retry = 0;
break;
case Opt_mapposix:
if (result.negated)
ctx->remap = false;
else {
ctx->remap = true;
ctx->sfu_remap = false; /* disable SFU mapping */
}
break;
case Opt_user_xattr:
if (result.negated)
ctx->no_xattr = 1;
else
ctx->no_xattr = 0;
break;
case Opt_forceuid:
if (result.negated)
ctx->override_uid = 0;
else
ctx->override_uid = 1;
break;
case Opt_forcegid:
if (result.negated)
ctx->override_gid = 0;
else
ctx->override_gid = 1;
break;
case Opt_perm:
if (result.negated)
ctx->noperm = 1;
else
ctx->noperm = 0;
break;
case Opt_dynperm:
if (result.negated)
ctx->dynperm = 0;
else
ctx->dynperm = 1;
break;
case Opt_sfu:
if (result.negated)
ctx->sfu_emul = 0;
else
ctx->sfu_emul = 1;
break;
case Opt_noblocksend:
ctx->noblocksnd = 1;
break;
case Opt_noautotune:
ctx->noautotune = 1;
break;
case Opt_nolease:
ctx->no_lease = 1;
break;
case Opt_nosparse:
ctx->no_sparse = 1;
break;
case Opt_nodelete:
ctx->nodelete = 1;
break;
case Opt_multichannel:
if (result.negated) {
ctx->multichannel = false;
ctx->max_channels = 1;
} else {
ctx->multichannel = true;
/* if number of channels not specified, default to 2 */
if (ctx->max_channels < 2)
ctx->max_channels = 2;
}
break;
case Opt_uid:
uid = make_kuid(current_user_ns(), result.uint_32);
if (!uid_valid(uid))
goto cifs_parse_mount_err;
ctx->linux_uid = uid;
ctx->uid_specified = true;
break;
case Opt_cruid:
uid = make_kuid(current_user_ns(), result.uint_32);
if (!uid_valid(uid))
goto cifs_parse_mount_err;
ctx->cred_uid = uid;
ctx->cruid_specified = true;
break;
case Opt_backupuid:
uid = make_kuid(current_user_ns(), result.uint_32);
if (!uid_valid(uid))
goto cifs_parse_mount_err;
ctx->backupuid = uid;
ctx->backupuid_specified = true;
break;
case Opt_backupgid:
gid = make_kgid(current_user_ns(), result.uint_32);
if (!gid_valid(gid))
goto cifs_parse_mount_err;
ctx->backupgid = gid;
ctx->backupgid_specified = true;
break;
case Opt_gid:
gid = make_kgid(current_user_ns(), result.uint_32);
if (!gid_valid(gid))
goto cifs_parse_mount_err;
ctx->linux_gid = gid;
ctx->gid_specified = true;
break;
case Opt_port:
ctx->port = result.uint_32;
break;
case Opt_file_mode:
ctx->file_mode = result.uint_32;
break;