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linux / linux / kernel / git / gregkh / char-misc / ebf57440ec59a36e1fc5fe91e31d66ae0d1662d0 / . / fs / cifs / connect.c
blob: 5fac34f192afd8f96ba125c0036905d7c962e1be [file] [log] [blame]
/*
* fs/cifs/connect.c
*
* Copyright (C) International Business Machines Corp., 2002,2011
* Author(s): Steve French (sfrench@us.ibm.com)
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/fs.h>
#include <linux/net.h>
#include <linux/string.h>
#include <linux/sched/mm.h>
#include <linux/sched/signal.h>
#include <linux/list.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/pagemap.h>
#include <linux/ctype.h>
#include <linux/utsname.h>
#include <linux/mempool.h>
#include <linux/delay.h>
#include <linux/completion.h>
#include <linux/kthread.h>
#include <linux/pagevec.h>
#include <linux/freezer.h>
#include <linux/namei.h>
#include <linux/uuid.h>
#include <linux/uaccess.h>
#include <asm/processor.h>
#include <linux/inet.h>
#include <linux/module.h>
#include <keys/user-type.h>
#include <net/ipv6.h>
#include <linux/parser.h>
#include <linux/bvec.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 "fscache.h"
#include "smb2proto.h"
#include "smbdirect.h"
#include "dns_resolve.h"
#ifdef CONFIG_CIFS_DFS_UPCALL
#include "dfs_cache.h"
#endif
extern mempool_t *cifs_req_poolp;
extern bool disable_legacy_dialects;
/* FIXME: should these be tunable? */
#define TLINK_ERROR_EXPIRE (1 * HZ)
#define TLINK_IDLE_EXPIRE (600 * HZ)
enum {
/* Mount options that take no arguments */
Opt_user_xattr, Opt_nouser_xattr,
Opt_forceuid, Opt_noforceuid,
Opt_forcegid, Opt_noforcegid,
Opt_noblocksend, Opt_noautotune, Opt_nolease,
Opt_hard, Opt_soft, Opt_perm, Opt_noperm, Opt_nodelete,
Opt_mapposix, Opt_nomapposix,
Opt_mapchars, Opt_nomapchars, Opt_sfu,
Opt_nosfu, Opt_nodfs, Opt_posixpaths,
Opt_noposixpaths, Opt_nounix, Opt_unix,
Opt_nocase,
Opt_brl, Opt_nobrl,
Opt_handlecache, Opt_nohandlecache,
Opt_forcemandatorylock, Opt_setuidfromacl, Opt_setuids,
Opt_nosetuids, Opt_dynperm, Opt_nodynperm,
Opt_nohard, Opt_nosoft,
Opt_nointr, Opt_intr,
Opt_nostrictsync, Opt_strictsync,
Opt_serverino, Opt_noserverino,
Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl,
Opt_acl, Opt_noacl, Opt_locallease,
Opt_sign, Opt_ignore_signature, Opt_seal, Opt_noac,
Opt_fsc, Opt_mfsymlinks,
Opt_multiuser, Opt_sloppy, Opt_nosharesock,
Opt_persistent, Opt_nopersistent,
Opt_resilient, Opt_noresilient,
Opt_domainauto, Opt_rdma, Opt_modesid, Opt_rootfs,
Opt_multichannel, Opt_nomultichannel,
Opt_compress,
/* Mount options which take numeric value */
Opt_backupuid, Opt_backupgid, Opt_uid,
Opt_cruid, Opt_gid, Opt_file_mode,
Opt_dirmode, Opt_port,
Opt_min_enc_offload,
Opt_blocksize, Opt_rsize, Opt_wsize, Opt_actimeo,
Opt_echo_interval, Opt_max_credits, Opt_handletimeout,
Opt_snapshot, Opt_max_channels,
/* Mount options which take string value */
Opt_user, Opt_pass, Opt_ip,
Opt_domain, Opt_srcaddr, Opt_iocharset,
Opt_netbiosname, Opt_servern,
Opt_ver, Opt_vers, Opt_sec, Opt_cache,
/* Mount options to be ignored */
Opt_ignore,
/* Options which could be blank */
Opt_blank_pass,
Opt_blank_user,
Opt_blank_ip,
Opt_err
};
static const match_table_t cifs_mount_option_tokens = {
{ Opt_user_xattr, "user_xattr" },
{ Opt_nouser_xattr, "nouser_xattr" },
{ Opt_forceuid, "forceuid" },
{ Opt_noforceuid, "noforceuid" },
{ Opt_forcegid, "forcegid" },
{ Opt_noforcegid, "noforcegid" },
{ Opt_noblocksend, "noblocksend" },
{ Opt_noautotune, "noautotune" },
{ Opt_nolease, "nolease" },
{ Opt_hard, "hard" },
{ Opt_soft, "soft" },
{ Opt_perm, "perm" },
{ Opt_noperm, "noperm" },
{ Opt_nodelete, "nodelete" },
{ Opt_mapchars, "mapchars" }, /* SFU style */
{ Opt_nomapchars, "nomapchars" },
{ Opt_mapposix, "mapposix" }, /* SFM style */
{ Opt_nomapposix, "nomapposix" },
{ Opt_sfu, "sfu" },
{ Opt_nosfu, "nosfu" },
{ Opt_nodfs, "nodfs" },
{ Opt_posixpaths, "posixpaths" },
{ Opt_noposixpaths, "noposixpaths" },
{ Opt_nounix, "nounix" },
{ Opt_nounix, "nolinux" },
{ Opt_nounix, "noposix" },
{ Opt_unix, "unix" },
{ Opt_unix, "linux" },
{ Opt_unix, "posix" },
{ Opt_nocase, "nocase" },
{ Opt_nocase, "ignorecase" },
{ Opt_brl, "brl" },
{ Opt_nobrl, "nobrl" },
{ Opt_handlecache, "handlecache" },
{ Opt_nohandlecache, "nohandlecache" },
{ Opt_nobrl, "nolock" },
{ Opt_forcemandatorylock, "forcemandatorylock" },
{ Opt_forcemandatorylock, "forcemand" },
{ Opt_setuids, "setuids" },
{ Opt_nosetuids, "nosetuids" },
{ Opt_setuidfromacl, "idsfromsid" },
{ Opt_dynperm, "dynperm" },
{ Opt_nodynperm, "nodynperm" },
{ Opt_nohard, "nohard" },
{ Opt_nosoft, "nosoft" },
{ Opt_nointr, "nointr" },
{ Opt_intr, "intr" },
{ Opt_nostrictsync, "nostrictsync" },
{ Opt_strictsync, "strictsync" },
{ Opt_serverino, "serverino" },
{ Opt_noserverino, "noserverino" },
{ Opt_rwpidforward, "rwpidforward" },
{ Opt_modesid, "modefromsid" },
{ Opt_cifsacl, "cifsacl" },
{ Opt_nocifsacl, "nocifsacl" },
{ Opt_acl, "acl" },
{ Opt_noacl, "noacl" },
{ Opt_locallease, "locallease" },
{ Opt_sign, "sign" },
{ Opt_ignore_signature, "signloosely" },
{ Opt_seal, "seal" },
{ Opt_noac, "noac" },
{ Opt_fsc, "fsc" },
{ Opt_mfsymlinks, "mfsymlinks" },
{ Opt_multiuser, "multiuser" },
{ Opt_sloppy, "sloppy" },
{ Opt_nosharesock, "nosharesock" },
{ Opt_persistent, "persistenthandles"},
{ Opt_nopersistent, "nopersistenthandles"},
{ Opt_resilient, "resilienthandles"},
{ Opt_noresilient, "noresilienthandles"},
{ Opt_domainauto, "domainauto"},
{ Opt_rdma, "rdma"},
{ Opt_multichannel, "multichannel" },
{ Opt_nomultichannel, "nomultichannel" },
{ Opt_backupuid, "backupuid=%s" },
{ Opt_backupgid, "backupgid=%s" },
{ Opt_uid, "uid=%s" },
{ Opt_cruid, "cruid=%s" },
{ Opt_gid, "gid=%s" },
{ Opt_file_mode, "file_mode=%s" },
{ Opt_dirmode, "dirmode=%s" },
{ Opt_dirmode, "dir_mode=%s" },
{ Opt_port, "port=%s" },
{ Opt_min_enc_offload, "esize=%s" },
{ Opt_blocksize, "bsize=%s" },
{ Opt_rsize, "rsize=%s" },
{ Opt_wsize, "wsize=%s" },
{ Opt_actimeo, "actimeo=%s" },
{ Opt_handletimeout, "handletimeout=%s" },
{ Opt_echo_interval, "echo_interval=%s" },
{ Opt_max_credits, "max_credits=%s" },
{ Opt_snapshot, "snapshot=%s" },
{ Opt_max_channels, "max_channels=%s" },
{ Opt_compress, "compress=%s" },
{ Opt_blank_user, "user=" },
{ Opt_blank_user, "username=" },
{ Opt_user, "user=%s" },
{ Opt_user, "username=%s" },
{ Opt_blank_pass, "pass=" },
{ Opt_blank_pass, "password=" },
{ Opt_pass, "pass=%s" },
{ Opt_pass, "password=%s" },
{ Opt_blank_ip, "ip=" },
{ Opt_blank_ip, "addr=" },
{ Opt_ip, "ip=%s" },
{ Opt_ip, "addr=%s" },
{ Opt_ignore, "unc=%s" },
{ Opt_ignore, "target=%s" },
{ Opt_ignore, "path=%s" },
{ Opt_domain, "dom=%s" },
{ Opt_domain, "domain=%s" },
{ Opt_domain, "workgroup=%s" },
{ Opt_srcaddr, "srcaddr=%s" },
{ Opt_ignore, "prefixpath=%s" },
{ Opt_iocharset, "iocharset=%s" },
{ Opt_netbiosname, "netbiosname=%s" },
{ Opt_servern, "servern=%s" },
{ Opt_ver, "ver=%s" },
{ Opt_vers, "vers=%s" },
{ Opt_sec, "sec=%s" },
{ Opt_cache, "cache=%s" },
{ Opt_ignore, "cred" },
{ Opt_ignore, "credentials" },
{ Opt_ignore, "cred=%s" },
{ Opt_ignore, "credentials=%s" },
{ Opt_ignore, "guest" },
{ Opt_ignore, "rw" },
{ Opt_ignore, "ro" },
{ Opt_ignore, "suid" },
{ Opt_ignore, "nosuid" },
{ Opt_ignore, "exec" },
{ Opt_ignore, "noexec" },
{ Opt_ignore, "nodev" },
{ Opt_ignore, "noauto" },
{ Opt_ignore, "dev" },
{ Opt_ignore, "mand" },
{ Opt_ignore, "nomand" },
{ Opt_ignore, "relatime" },
{ Opt_ignore, "_netdev" },
{ Opt_rootfs, "rootfs" },
{ Opt_err, NULL }
};
enum {
Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p,
Opt_sec_ntlmsspi, Opt_sec_ntlmssp,
Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2,
Opt_sec_ntlmv2i, Opt_sec_lanman,
Opt_sec_none,
Opt_sec_err
};
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_ntlm, "ntlm" },
{ Opt_sec_ntlmi, "ntlmi" },
{ Opt_sec_ntlmv2, "nontlm" },
{ Opt_sec_ntlmv2, "ntlmv2" },
{ Opt_sec_ntlmv2i, "ntlmv2i" },
{ Opt_sec_lanman, "lanman" },
{ Opt_sec_none, "none" },
{ Opt_sec_err, NULL }
};
/* cache flavors */
enum {
Opt_cache_loose,
Opt_cache_strict,
Opt_cache_none,
Opt_cache_ro,
Opt_cache_rw,
Opt_cache_err
};
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 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 int ip_connect(struct TCP_Server_Info *server);
static int generic_ip_connect(struct TCP_Server_Info *server);
static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink);
static void cifs_prune_tlinks(struct work_struct *work);
static char *extract_hostname(const char *unc);
/*
* Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may
* get their ip addresses changed at some point.
*
* This should be called with server->srv_mutex held.
*/
#ifdef CONFIG_CIFS_DFS_UPCALL
static int reconn_set_ipaddr(struct TCP_Server_Info *server)
{
int rc;
int len;
char *unc, *ipaddr = NULL;
if (!server->hostname)
return -EINVAL;
len = strlen(server->hostname) + 3;
unc = kmalloc(len, GFP_KERNEL);
if (!unc) {
cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__);
return -ENOMEM;
}
scnprintf(unc, len, "\\\\%s", server->hostname);
rc = dns_resolve_server_name_to_ip(unc, &ipaddr);
kfree(unc);
if (rc < 0) {
cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n",
__func__, server->hostname, rc);
return rc;
}
spin_lock(&cifs_tcp_ses_lock);
rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr,
strlen(ipaddr));
spin_unlock(&cifs_tcp_ses_lock);
kfree(ipaddr);
return !rc ? -1 : 0;
}
#else
static inline int reconn_set_ipaddr(struct TCP_Server_Info *server)
{
return 0;
}
#endif
#ifdef CONFIG_CIFS_DFS_UPCALL
/* These functions must be called with server->srv_mutex held */
static void reconn_inval_dfs_target(struct TCP_Server_Info *server,
struct cifs_sb_info *cifs_sb,
struct dfs_cache_tgt_list *tgt_list,
struct dfs_cache_tgt_iterator **tgt_it)
{
const char *name;
if (!cifs_sb || !cifs_sb->origin_fullpath || !tgt_list ||
!server->nr_targets)
return;
if (!*tgt_it) {
*tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
} else {
*tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
if (!*tgt_it)
*tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
}
cifs_dbg(FYI, "%s: UNC: %s\n", __func__, cifs_sb->origin_fullpath);
name = dfs_cache_get_tgt_name(*tgt_it);
kfree(server->hostname);
server->hostname = extract_hostname(name);
if (IS_ERR(server->hostname)) {
cifs_dbg(FYI,
"%s: failed to extract hostname from target: %ld\n",
__func__, PTR_ERR(server->hostname));
}
}
static inline int reconn_setup_dfs_targets(struct cifs_sb_info *cifs_sb,
struct dfs_cache_tgt_list *tl)
{
if (!cifs_sb->origin_fullpath)
return -EOPNOTSUPP;
return dfs_cache_noreq_find(cifs_sb->origin_fullpath + 1, NULL, tl);
}
#endif
/*
* cifs tcp session reconnection
*
* mark tcp session as reconnecting so temporarily locked
* mark all smb sessions as reconnecting for tcp session
* reconnect tcp session
* wake up waiters on reconnection? - (not needed currently)
*/
int
cifs_reconnect(struct TCP_Server_Info *server)
{
int rc = 0;
struct list_head *tmp, *tmp2;
struct cifs_ses *ses;
struct cifs_tcon *tcon;
struct mid_q_entry *mid_entry;
struct list_head retry_list;
#ifdef CONFIG_CIFS_DFS_UPCALL
struct super_block *sb = NULL;
struct cifs_sb_info *cifs_sb = NULL;
struct dfs_cache_tgt_list tgt_list = {0};
struct dfs_cache_tgt_iterator *tgt_it = NULL;
#endif
spin_lock(&GlobalMid_Lock);
server->nr_targets = 1;
#ifdef CONFIG_CIFS_DFS_UPCALL
spin_unlock(&GlobalMid_Lock);
sb = cifs_get_tcp_super(server);
if (IS_ERR(sb)) {
rc = PTR_ERR(sb);
cifs_dbg(FYI, "%s: will not do DFS failover: rc = %d\n",
__func__, rc);
sb = NULL;
} else {
cifs_sb = CIFS_SB(sb);
rc = reconn_setup_dfs_targets(cifs_sb, &tgt_list);
if (rc && (rc != -EOPNOTSUPP)) {
cifs_server_dbg(VFS, "%s: no target servers for DFS failover\n",
__func__);
} else {
server->nr_targets = dfs_cache_get_nr_tgts(&tgt_list);
}
}
cifs_dbg(FYI, "%s: will retry %d target(s)\n", __func__,
server->nr_targets);
spin_lock(&GlobalMid_Lock);
#endif
if (server->tcpStatus == CifsExiting) {
/* the demux thread will exit normally
next time through the loop */
spin_unlock(&GlobalMid_Lock);
#ifdef CONFIG_CIFS_DFS_UPCALL
dfs_cache_free_tgts(&tgt_list);
cifs_put_tcp_super(sb);
#endif
wake_up(&server->response_q);
return rc;
} else
server->tcpStatus = CifsNeedReconnect;
spin_unlock(&GlobalMid_Lock);
server->maxBuf = 0;
server->max_read = 0;
cifs_dbg(FYI, "Mark tcp session as need reconnect\n");
trace_smb3_reconnect(server->CurrentMid, server->hostname);
/* before reconnecting the tcp session, mark the smb session (uid)
and the tid bad so they are not used until reconnected */
cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n",
__func__);
spin_lock(&cifs_tcp_ses_lock);
list_for_each(tmp, &server->smb_ses_list) {
ses = list_entry(tmp, struct cifs_ses, smb_ses_list);
ses->need_reconnect = true;
list_for_each(tmp2, &ses->tcon_list) {
tcon = list_entry(tmp2, struct cifs_tcon, tcon_list);
tcon->need_reconnect = true;
}
if (ses->tcon_ipc)
ses->tcon_ipc->need_reconnect = true;
}
spin_unlock(&cifs_tcp_ses_lock);
/* do not want to be sending data on a socket we are freeing */
cifs_dbg(FYI, "%s: tearing down socket\n", __func__);
mutex_lock(&server->srv_mutex);
if (server->ssocket) {
cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n",
server->ssocket->state, server->ssocket->flags);
kernel_sock_shutdown(server->ssocket, SHUT_WR);
cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n",
server->ssocket->state, server->ssocket->flags);
sock_release(server->ssocket);
server->ssocket = NULL;
}
server->sequence_number = 0;
server->session_estab = false;
kfree(server->session_key.response);
server->session_key.response = NULL;
server->session_key.len = 0;
server->lstrp = jiffies;
/* mark submitted MIDs for retry and issue callback */
INIT_LIST_HEAD(&retry_list);
cifs_dbg(FYI, "%s: moving mids to private list\n", __func__);
spin_lock(&GlobalMid_Lock);
list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
kref_get(&mid_entry->refcount);
if (mid_entry->mid_state == MID_REQUEST_SUBMITTED)
mid_entry->mid_state = MID_RETRY_NEEDED;
list_move(&mid_entry->qhead, &retry_list);
mid_entry->mid_flags |= MID_DELETED;
}
spin_unlock(&GlobalMid_Lock);
mutex_unlock(&server->srv_mutex);
cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
list_for_each_safe(tmp, tmp2, &retry_list) {
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
list_del_init(&mid_entry->qhead);
mid_entry->callback(mid_entry);
cifs_mid_q_entry_release(mid_entry);
}
if (cifs_rdma_enabled(server)) {
mutex_lock(&server->srv_mutex);
smbd_destroy(server);
mutex_unlock(&server->srv_mutex);
}
do {
try_to_freeze();
mutex_lock(&server->srv_mutex);
#ifdef CONFIG_CIFS_DFS_UPCALL
/*
* Set up next DFS target server (if any) for reconnect. If DFS
* feature is disabled, then we will retry last server we
* connected to before.
*/
reconn_inval_dfs_target(server, cifs_sb, &tgt_list, &tgt_it);
#endif
rc = reconn_set_ipaddr(server);
if (rc) {
cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n",
__func__, rc);
}
if (cifs_rdma_enabled(server))
rc = smbd_reconnect(server);
else
rc = generic_ip_connect(server);
if (rc) {
cifs_dbg(FYI, "reconnect error %d\n", rc);
mutex_unlock(&server->srv_mutex);
msleep(3000);
} else {
atomic_inc(&tcpSesReconnectCount);
set_credits(server, 1);
spin_lock(&GlobalMid_Lock);
if (server->tcpStatus != CifsExiting)
server->tcpStatus = CifsNeedNegotiate;
spin_unlock(&GlobalMid_Lock);
mutex_unlock(&server->srv_mutex);
}
} while (server->tcpStatus == CifsNeedReconnect);
#ifdef CONFIG_CIFS_DFS_UPCALL
if (tgt_it) {
rc = dfs_cache_noreq_update_tgthint(cifs_sb->origin_fullpath + 1,
tgt_it);
if (rc) {
cifs_server_dbg(VFS, "%s: failed to update DFS target hint: rc = %d\n",
__func__, rc);
}
rc = dfs_cache_update_vol(cifs_sb->origin_fullpath, server);
if (rc) {
cifs_server_dbg(VFS, "%s: failed to update vol info in DFS cache: rc = %d\n",
__func__, rc);
}
dfs_cache_free_tgts(&tgt_list);
}
cifs_put_tcp_super(sb);
#endif
if (server->tcpStatus == CifsNeedNegotiate)
mod_delayed_work(cifsiod_wq, &server->echo, 0);
wake_up(&server->response_q);
return rc;
}
static void
cifs_echo_request(struct work_struct *work)
{
int rc;
struct TCP_Server_Info *server = container_of(work,
struct TCP_Server_Info, echo.work);
unsigned long echo_interval;
/*
* If we need to renegotiate, set echo interval to zero to
* immediately call echo service where we can renegotiate.
*/
if (server->tcpStatus == CifsNeedNegotiate)
echo_interval = 0;
else
echo_interval = server->echo_interval;
/*
* We cannot send an echo if it is disabled.
* Also, no need to ping if we got a response recently.
*/
if (server->tcpStatus == CifsNeedReconnect ||
server->tcpStatus == CifsExiting ||
server->tcpStatus == CifsNew ||
(server->ops->can_echo && !server->ops->can_echo(server)) ||
time_before(jiffies, server->lstrp + echo_interval - HZ))
goto requeue_echo;
rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS;
if (rc)
cifs_dbg(FYI, "Unable to send echo request to server: %s\n",
server->hostname);
requeue_echo:
queue_delayed_work(cifsiod_wq, &server->echo, server->echo_interval);
}
static bool
allocate_buffers(struct TCP_Server_Info *server)
{
if (!server->bigbuf) {
server->bigbuf = (char *)cifs_buf_get();
if (!server->bigbuf) {
cifs_server_dbg(VFS, "No memory for large SMB response\n");
msleep(3000);
/* retry will check if exiting */
return false;
}
} else if (server->large_buf) {
/* we are reusing a dirty large buf, clear its start */
memset(server->bigbuf, 0, HEADER_SIZE(server));
}
if (!server->smallbuf) {
server->smallbuf = (char *)cifs_small_buf_get();
if (!server->smallbuf) {
cifs_server_dbg(VFS, "No memory for SMB response\n");
msleep(1000);
/* retry will check if exiting */
return false;
}
/* beginning of smb buffer is cleared in our buf_get */
} else {
/* if existing small buf clear beginning */
memset(server->smallbuf, 0, HEADER_SIZE(server));
}
return true;
}
static bool
server_unresponsive(struct TCP_Server_Info *server)
{
/*
* We need to wait 3 echo intervals to make sure we handle such
* situations right:
* 1s client sends a normal SMB request
* 2s client gets a response
* 30s echo workqueue job pops, and decides we got a response recently
* and don't need to send another
* ...
* 65s kernel_recvmsg times out, and we see that we haven't gotten
* a response in >60s.
*/
if ((server->tcpStatus == CifsGood ||
server->tcpStatus == CifsNeedNegotiate) &&
time_after(jiffies, server->lstrp + 3 * server->echo_interval)) {
cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
(3 * server->echo_interval) / HZ);
cifs_reconnect(server);
return true;
}
return false;
}
static inline bool
zero_credits(struct TCP_Server_Info *server)
{
int val;
spin_lock(&server->req_lock);
val = server->credits + server->echo_credits + server->oplock_credits;
if (server->in_flight == 0 && val == 0) {
spin_unlock(&server->req_lock);
return true;
}
spin_unlock(&server->req_lock);
return false;
}
static int
cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
{
int length = 0;
int total_read;
smb_msg->msg_control = NULL;
smb_msg->msg_controllen = 0;
for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
try_to_freeze();
/* reconnect if no credits and no requests in flight */
if (zero_credits(server)) {
cifs_reconnect(server);
return -ECONNABORTED;
}
if (server_unresponsive(server))
return -ECONNABORTED;
if (cifs_rdma_enabled(server) && server->smbd_conn)
length = smbd_recv(server->smbd_conn, smb_msg);
else
length = sock_recvmsg(server->ssocket, smb_msg, 0);
if (server->tcpStatus == CifsExiting)
return -ESHUTDOWN;
if (server->tcpStatus == CifsNeedReconnect) {
cifs_reconnect(server);
return -ECONNABORTED;
}
if (length == -ERESTARTSYS ||
length == -EAGAIN ||
length == -EINTR) {
/*
* Minimum sleep to prevent looping, allowing socket
* to clear and app threads to set tcpStatus
* CifsNeedReconnect if server hung.
*/
usleep_range(1000, 2000);
length = 0;
continue;
}
if (length <= 0) {
cifs_dbg(FYI, "Received no data or error: %d\n", length);
cifs_reconnect(server);
return -ECONNABORTED;
}
}
return total_read;
}
int
cifs_read_from_socket(struct TCP_Server_Info *server, char *buf,
unsigned int to_read)
{
struct msghdr smb_msg;
struct kvec iov = {.iov_base = buf, .iov_len = to_read};
iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read);
return cifs_readv_from_socket(server, &smb_msg);
}
int
cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page,
unsigned int page_offset, unsigned int to_read)
{
struct msghdr smb_msg;
struct bio_vec bv = {
.bv_page = page, .bv_len = to_read, .bv_offset = page_offset};
iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read);
return cifs_readv_from_socket(server, &smb_msg);
}
static bool
is_smb_response(struct TCP_Server_Info *server, unsigned char type)
{
/*
* The first byte big endian of the length field,
* is actually not part of the length but the type
* with the most common, zero, as regular data.
*/
switch (type) {
case RFC1002_SESSION_MESSAGE:
/* Regular SMB response */
return true;
case RFC1002_SESSION_KEEP_ALIVE:
cifs_dbg(FYI, "RFC 1002 session keep alive\n");
break;
case RFC1002_POSITIVE_SESSION_RESPONSE:
cifs_dbg(FYI, "RFC 1002 positive session response\n");
break;
case RFC1002_NEGATIVE_SESSION_RESPONSE:
/*
* We get this from Windows 98 instead of an error on
* SMB negprot response.
*/
cifs_dbg(FYI, "RFC 1002 negative session response\n");
/* give server a second to clean up */
msleep(1000);
/*
* Always try 445 first on reconnect since we get NACK
* on some if we ever connected to port 139 (the NACK
* is since we do not begin with RFC1001 session
* initialize frame).
*/
cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT);
cifs_reconnect(server);
break;
default:
cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
cifs_reconnect(server);
}
return false;
}
void
dequeue_mid(struct mid_q_entry *mid, bool malformed)
{
#ifdef CONFIG_CIFS_STATS2
mid->when_received = jiffies;
#endif
spin_lock(&GlobalMid_Lock);
if (!malformed)
mid->mid_state = MID_RESPONSE_RECEIVED;
else
mid->mid_state = MID_RESPONSE_MALFORMED;
/*
* Trying to handle/dequeue a mid after the send_recv()
* function has finished processing it is a bug.
*/
if (mid->mid_flags & MID_DELETED)
pr_warn_once("trying to dequeue a deleted mid\n");
else {
list_del_init(&mid->qhead);
mid->mid_flags |= MID_DELETED;
}
spin_unlock(&GlobalMid_Lock);
}
static unsigned int
smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
{
struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
/*
* SMB1 does not use credits.
*/
if (server->vals->header_preamble_size)
return 0;
return le16_to_cpu(shdr->CreditRequest);
}
static void
handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server,
char *buf, int malformed)
{
if (server->ops->check_trans2 &&
server->ops->check_trans2(mid, server, buf, malformed))
return;
mid->credits_received = smb2_get_credits_from_hdr(buf, server);
mid->resp_buf = buf;
mid->large_buf = server->large_buf;
/* Was previous buf put in mpx struct for multi-rsp? */
if (!mid->multiRsp) {
/* smb buffer will be freed by user thread */
if (server->large_buf)
server->bigbuf = NULL;
else
server->smallbuf = NULL;
}
dequeue_mid(mid, malformed);
}
static void clean_demultiplex_info(struct TCP_Server_Info *server)
{
int length;
/* take it off the list, if it's not already */
spin_lock(&cifs_tcp_ses_lock);
list_del_init(&server->tcp_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
spin_lock(&GlobalMid_Lock);
server->tcpStatus = CifsExiting;
spin_unlock(&GlobalMid_Lock);
wake_up_all(&server->response_q);
/* check if we have blocked requests that need to free */
spin_lock(&server->req_lock);
if (server->credits <= 0)
server->credits = 1;
spin_unlock(&server->req_lock);
/*
* Although there should not be any requests blocked on this queue it
* can not hurt to be paranoid and try to wake up requests that may
* haven been blocked when more than 50 at time were on the wire to the
* same server - they now will see the session is in exit state and get
* out of SendReceive.
*/
wake_up_all(&server->request_q);
/* give those requests time to exit */
msleep(125);
if (cifs_rdma_enabled(server))
smbd_destroy(server);
if (server->ssocket) {
sock_release(server->ssocket);
server->ssocket = NULL;
}
if (!list_empty(&server->pending_mid_q)) {
struct list_head dispose_list;
struct mid_q_entry *mid_entry;
struct list_head *tmp, *tmp2;
INIT_LIST_HEAD(&dispose_list);
spin_lock(&GlobalMid_Lock);
list_for_each_safe(tmp, tmp2, &server->pending_mid_q) {
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid);
kref_get(&mid_entry->refcount);
mid_entry->mid_state = MID_SHUTDOWN;
list_move(&mid_entry->qhead, &dispose_list);
mid_entry->mid_flags |= MID_DELETED;
}
spin_unlock(&GlobalMid_Lock);
/* now walk dispose list and issue callbacks */
list_for_each_safe(tmp, tmp2, &dispose_list) {
mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid);
list_del_init(&mid_entry->qhead);
mid_entry->callback(mid_entry);
cifs_mid_q_entry_release(mid_entry);
}
/* 1/8th of sec is more than enough time for them to exit */
msleep(125);
}
if (!list_empty(&server->pending_mid_q)) {
/*
* mpx threads have not exited yet give them at least the smb
* send timeout time for long ops.
*
* Due to delays on oplock break requests, we need to wait at
* least 45 seconds before giving up on a request getting a
* response and going ahead and killing cifsd.
*/
cifs_dbg(FYI, "Wait for exit from demultiplex thread\n");
msleep(46000);
/*
* If threads still have not exited they are probably never
* coming home not much else we can do but free the memory.
*/
}
kfree(server->hostname);
kfree(server);
length = atomic_dec_return(&tcpSesAllocCount);
if (length > 0)
mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
}
static int
standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
int length;
char *buf = server->smallbuf;
unsigned int pdu_length = server->pdu_size;
/* make sure this will fit in a large buffer */
if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) -
server->vals->header_preamble_size) {
cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
cifs_reconnect(server);
return -ECONNABORTED;
}
/* switch to large buffer if too big for a small one */
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) {
server->large_buf = true;
memcpy(server->bigbuf, buf, server->total_read);
buf = server->bigbuf;
}
/* now read the rest */
length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1,
pdu_length - HEADER_SIZE(server) + 1
+ server->vals->header_preamble_size);
if (length < 0)
return length;
server->total_read += length;
dump_smb(buf, server->total_read);
return cifs_handle_standard(server, mid);
}
int
cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid)
{
char *buf = server->large_buf ? server->bigbuf : server->smallbuf;
int length;
/*
* We know that we received enough to get to the MID as we
* checked the pdu_length earlier. Now check to see
* if the rest of the header is OK. We borrow the length
* var for the rest of the loop to avoid a new stack var.
*
* 48 bytes is enough to display the header and a little bit
* into the payload for debugging purposes.
*/
length = server->ops->check_message(buf, server->total_read, server);
if (length != 0)
cifs_dump_mem("Bad SMB: ", buf,
min_t(unsigned int, server->total_read, 48));
if (server->ops->is_session_expired &&
server->ops->is_session_expired(buf)) {
cifs_reconnect(server);
return -1;
}
if (server->ops->is_status_pending &&
server->ops->is_status_pending(buf, server))
return -1;
if (!mid)
return length;
handle_mid(mid, server, buf, length);
return 0;
}
static void
smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
{
struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer;
/*
* SMB1 does not use credits.
*/
if (server->vals->header_preamble_size)
return;
if (shdr->CreditRequest) {
spin_lock(&server->req_lock);
server->credits += le16_to_cpu(shdr->CreditRequest);
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
}
}
static int
cifs_demultiplex_thread(void *p)
{
int i, num_mids, length;
struct TCP_Server_Info *server = p;
unsigned int pdu_length;
unsigned int next_offset;
char *buf = NULL;
struct task_struct *task_to_wake = NULL;
struct mid_q_entry *mids[MAX_COMPOUND];
char *bufs[MAX_COMPOUND];
unsigned int noreclaim_flag;
noreclaim_flag = memalloc_noreclaim_save();
cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current));
length = atomic_inc_return(&tcpSesAllocCount);
if (length > 1)
mempool_resize(cifs_req_poolp, length + cifs_min_rcv);
set_freezable();
allow_kernel_signal(SIGKILL);
while (server->tcpStatus != CifsExiting) {
if (try_to_freeze())
continue;
if (!allocate_buffers(server))
continue;
server->large_buf = false;
buf = server->smallbuf;
pdu_length = 4; /* enough to get RFC1001 header */
length = cifs_read_from_socket(server, buf, pdu_length);
if (length < 0)
continue;
if (server->vals->header_preamble_size == 0)
server->total_read = 0;
else
server->total_read = length;
/*
* The right amount was read from socket - 4 bytes,
* so we can now interpret the length field.
*/
pdu_length = get_rfc1002_length(buf);
cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length);
if (!is_smb_response(server, buf[0]))
continue;
next_pdu:
server->pdu_size = pdu_length;
/* make sure we have enough to get to the MID */
if (server->pdu_size < HEADER_SIZE(server) - 1 -
server->vals->header_preamble_size) {
cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
server->pdu_size);
cifs_reconnect(server);
continue;
}
/* read down to the MID */
length = cifs_read_from_socket(server,
buf + server->vals->header_preamble_size,
HEADER_SIZE(server) - 1
- server->vals->header_preamble_size);
if (length < 0)
continue;
server->total_read += length;
if (server->ops->next_header) {
next_offset = server->ops->next_header(buf);
if (next_offset)
server->pdu_size = next_offset;
}
memset(mids, 0, sizeof(mids));
memset(bufs, 0, sizeof(bufs));
num_mids = 0;
if (server->ops->is_transform_hdr &&
server->ops->receive_transform &&
server->ops->is_transform_hdr(buf)) {
length = server->ops->receive_transform(server,
mids,
bufs,
&num_mids);
} else {
mids[0] = server->ops->find_mid(server, buf);
bufs[0] = buf;
num_mids = 1;
if (!mids[0] || !mids[0]->receive)
length = standard_receive3(server, mids[0]);
else
length = mids[0]->receive(server, mids[0]);
}
if (length < 0) {
for (i = 0; i < num_mids; i++)
if (mids[i])
cifs_mid_q_entry_release(mids[i]);
continue;
}
server->lstrp = jiffies;
for (i = 0; i < num_mids; i++) {
if (mids[i] != NULL) {
mids[i]->resp_buf_size = server->pdu_size;
if (!mids[i]->multiRsp || mids[i]->multiEnd)
mids[i]->callback(mids[i]);
cifs_mid_q_entry_release(mids[i]);
} else if (server->ops->is_oplock_break &&
server->ops->is_oplock_break(bufs[i],
server)) {
smb2_add_credits_from_hdr(bufs[i], server);
cifs_dbg(FYI, "Received oplock break\n");
} else {
cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n",
atomic_read(&midCount));
cifs_dump_mem("Received Data is: ", bufs[i],
HEADER_SIZE(server));
smb2_add_credits_from_hdr(bufs[i], server);
#ifdef CONFIG_CIFS_DEBUG2
if (server->ops->dump_detail)
server->ops->dump_detail(bufs[i],
server);
cifs_dump_mids(server);
#endif /* CIFS_DEBUG2 */
}
}
if (pdu_length > server->pdu_size) {
if (!allocate_buffers(server))
continue;
pdu_length -= server->pdu_size;
server->total_read = 0;
server->large_buf = false;
buf = server->smallbuf;
goto next_pdu;
}
} /* end while !EXITING */
/* buffer usually freed in free_mid - need to free it here on exit */
cifs_buf_release(server->bigbuf);
if (server->smallbuf) /* no sense logging a debug message if NULL */
cifs_small_buf_release(server->smallbuf);
task_to_wake = xchg(&server->tsk, NULL);
clean_demultiplex_info(server);
/* if server->tsk was NULL then wait for a signal before exiting */
if (!task_to_wake) {
set_current_state(TASK_INTERRUPTIBLE);
while (!signal_pending(current)) {
schedule();
set_current_state(TASK_INTERRUPTIBLE);
}
set_current_state(TASK_RUNNING);
}
memalloc_noreclaim_restore(noreclaim_flag);
module_put_and_exit(0);
}
/* extract the host portion of the UNC string */
static char *
extract_hostname(const char *unc)
{
const char *src;
char *dst, *delim;
unsigned int len;
/* skip double chars at beginning of string */
/* BB: check validity of these bytes? */
if (strlen(unc) < 3)
return ERR_PTR(-EINVAL);
for (src = unc; *src && *src == '\\'; src++)
;
if (!*src)
return ERR_PTR(-EINVAL);
/* delimiter between hostname and sharename is always '\\' now */
delim = strchr(src, '\\');
if (!delim)
return ERR_PTR(-EINVAL);
len = delim - src;
dst = kmalloc((len + 1), GFP_KERNEL);
if (dst == NULL)
return ERR_PTR(-ENOMEM);
memcpy(dst, src, len);
dst[len] = '\0';
return dst;
}
static int get_option_ul(substring_t args[], unsigned long *option)
{
int rc;
char *string;
string = match_strdup(args);
if (string == NULL)
return -ENOMEM;
rc = kstrtoul(string, 0, option);
kfree(string);
return rc;
}
static int get_option_uid(substring_t args[], kuid_t *result)
{
unsigned long value;
kuid_t uid;
int rc;
rc = get_option_ul(args, &value);
if (rc)
return rc;
uid = make_kuid(current_user_ns(), value);
if (!uid_valid(uid))
return -EINVAL;
*result = uid;
return 0;
}
static int get_option_gid(substring_t args[], kgid_t *result)
{
unsigned long value;
kgid_t gid;
int rc;
rc = get_option_ul(args, &value);
if (rc)
return rc;
gid = make_kgid(current_user_ns(), value);
if (!gid_valid(gid))
return -EINVAL;
*result = gid;
return 0;
}
static int cifs_parse_security_flavors(char *value,
struct smb_vol *vol)
{
substring_t args[MAX_OPT_ARGS];
/*
* With mount options, the last one should win. Reset any existing
* settings back to default.
*/
vol->sectype = Unspecified;
vol->sign = false;
switch (match_token(value, cifs_secflavor_tokens, args)) {
case Opt_sec_krb5p:
cifs_dbg(VFS, "sec=krb5p is not supported!\n");
return 1;
case Opt_sec_krb5i:
vol->sign = true;
/* Fallthrough */
case Opt_sec_krb5:
vol->sectype = Kerberos;
break;
case Opt_sec_ntlmsspi:
vol->sign = true;
/* Fallthrough */
case Opt_sec_ntlmssp:
vol->sectype = RawNTLMSSP;
break;
case Opt_sec_ntlmi:
vol->sign = true;
/* Fallthrough */
case Opt_ntlm:
vol->sectype = NTLM;
break;
case Opt_sec_ntlmv2i:
vol->sign = true;
/* Fallthrough */
case Opt_sec_ntlmv2:
vol->sectype = NTLMv2;
break;
#ifdef CONFIG_CIFS_WEAK_PW_HASH
case Opt_sec_lanman:
vol->sectype = LANMAN;
break;
#endif
case Opt_sec_none:
vol->nullauth = 1;
break;
default:
cifs_dbg(VFS, "bad security option: %s\n", value);
return 1;
}
return 0;
}
static int
cifs_parse_cache_flavor(char *value, struct smb_vol *vol)
{
substring_t args[MAX_OPT_ARGS];
switch (match_token(value, cifs_cacheflavor_tokens, args)) {
case Opt_cache_loose:
vol->direct_io = false;
vol->strict_io = false;
vol->cache_ro = false;
vol->cache_rw = false;
break;
case Opt_cache_strict:
vol->direct_io = false;
vol->strict_io = true;
vol->cache_ro = false;
vol->cache_rw = false;
break;
case Opt_cache_none:
vol->direct_io = true;
vol->strict_io = false;
vol->cache_ro = false;
vol->cache_rw = false;
break;
case Opt_cache_ro:
vol->direct_io = false;
vol->strict_io = false;
vol->cache_ro = true;
vol->cache_rw = false;
break;
case Opt_cache_rw:
vol->direct_io = false;
vol->strict_io = false;
vol->cache_ro = false;
vol->cache_rw = true;
break;
default:
cifs_dbg(VFS, "bad cache= option: %s\n", value);
return 1;
}
return 0;
}
static int
cifs_parse_smb_version(char *value, struct smb_vol *vol, 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_dbg(VFS, "mount with legacy dialect disabled\n");
return 1;
}
if (is_smb3) {
cifs_dbg(VFS, "vers=1.0 (cifs) not permitted when mounting with smb3\n");
return 1;
}
cifs_dbg(VFS, "Use of the less secure dialect vers=1.0 is not recommended unless required for access to very old servers\n");
vol->ops = &smb1_operations;
vol->vals = &smb1_values;
break;
case Smb_20:
if (disable_legacy_dialects) {
cifs_dbg(VFS, "mount with legacy dialect disabled\n");
return 1;
}
if (is_smb3) {
cifs_dbg(VFS, "vers=2.0 not permitted when mounting with smb3\n");
return 1;
}
vol->ops = &smb20_operations;
vol->vals = &smb20_values;
break;
#else
case Smb_1:
cifs_dbg(VFS, "vers=1.0 (cifs) mount not permitted when legacy dialects disabled\n");
return 1;
case Smb_20:
cifs_dbg(VFS, "vers=2.0 mount not permitted when legacy dialects disabled\n");
return 1;
#endif /* CIFS_ALLOW_INSECURE_LEGACY */
case Smb_21:
vol->ops = &smb21_operations;
vol->vals = &smb21_values;
break;
case Smb_30:
vol->ops = &smb30_operations;
vol->vals = &smb30_values;
break;
case Smb_302:
vol->ops = &smb30_operations; /* currently identical with 3.0 */
vol->vals = &smb302_values;
break;
case Smb_311:
vol->ops = &smb311_operations;
vol->vals = &smb311_values;
break;
case Smb_3any:
vol->ops = &smb30_operations; /* currently identical with 3.0 */
vol->vals = &smb3any_values;
break;
case Smb_default:
vol->ops = &smb30_operations; /* currently identical with 3.0 */
vol->vals = &smbdefault_values;
break;
default:
cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value);
return 1;
}
return 0;
}
/*
* Parse a devname into substrings and populate the vol->UNC and vol->prepath
* fields with the result. Returns 0 on success and an error otherwise.
*/
static int
cifs_parse_devname(const char *devname, struct smb_vol *vol)
{
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;
/* 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;
vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL);
if (!vol->UNC)
return -ENOMEM;
convert_delimiter(vol->UNC, '\\');
/* skip any delimiter */
if (*pos == '/' || *pos == '\\')
pos++;
/* If pos is NULL then no prepath */
if (!*pos)
return 0;
vol->prepath = kstrdup(pos, GFP_KERNEL);
if (!vol->prepath)
return -ENOMEM;
return 0;
}
static int
cifs_parse_mount_options(const char *mountdata, const char *devname,
struct smb_vol *vol, bool is_smb3)
{
char *data, *end;
char *mountdata_copy = NULL, *options;
unsigned int temp_len, i, j;
char separator[2];
short int override_uid = -1;
short int override_gid = -1;
bool uid_specified = false;
bool gid_specified = false;
bool sloppy = false;
char *invalid = NULL;
char *nodename = utsname()->nodename;
char *string = NULL;
char *tmp_end, *value;
char delim;
bool got_ip = false;
bool got_version = false;
unsigned short port = 0;
struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr;
separator[0] = ',';
separator[1] = 0;
delim = separator[0];
/* ensure we always start with zeroed-out smb_vol */
memset(vol, 0, sizeof(*vol));
/*
* does not have to be perfect mapping since field is
* informational, only used for servers that do not support
* port 445 and it can be overridden at mount time
*/
memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN);
for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++)
vol->source_rfc1001_name[i] = toupper(nodename[i]);
vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0;
/* null target name indicates to use *SMBSERVR default called name
if we end up sending RFC1001 session initialize */
vol->target_rfc1001_name[0] = 0;
vol->cred_uid = current_uid();
vol->linux_uid = current_uid();
vol->linux_gid = current_gid();
vol->bsize = 1024 * 1024; /* can improve cp performance significantly */
/*
* default to SFM style remapping of seven reserved characters
* unless user overrides it or we negotiate CIFS POSIX where
* it is unnecessary. Can not simultaneously use more than one mapping
* since then readdir could list files that open could not open
*/
vol->remap = true;
/* default to only allowing write access to owner of the mount */
vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR;
/* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */
/* default is always to request posix paths. */
vol->posix_paths = 1;
/* default to using server inode numbers where available */
vol->server_ino = 1;
/* default is to use strict cifs caching semantics */
vol->strict_io = true;
vol->actimeo = CIFS_DEF_ACTIMEO;
/* Most clients set timeout to 0, allows server to use its default */
vol->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */
/* offer SMB2.1 and later (SMB3 etc). Secure and widely accepted */
vol->ops = &smb30_operations;
vol->vals = &smbdefault_values;
vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;
/* default to no multichannel (single server connection) */
vol->multichannel = false;
vol->max_channels = 1;
if (!mountdata)
goto cifs_parse_mount_err;
mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL);
if (!mountdata_copy)
goto cifs_parse_mount_err;
options = mountdata_copy;
end = options + strlen(options);
if (strncmp(options, "sep=", 4) == 0) {
if (options[4] != 0) {
separator[0] = options[4];
options += 5;
} else {
cifs_dbg(FYI, "Null separator not allowed\n");
}
}
vol->backupuid_specified = false; /* no backup intent for a user */
vol->backupgid_specified = false; /* no backup intent for a group */
switch (cifs_parse_devname(devname, vol)) {
case 0:
break;
case -ENOMEM:
cifs_dbg(VFS, "Unable to allocate memory for devname\n");
goto cifs_parse_mount_err;
case -EINVAL:
cifs_dbg(VFS, "Malformed UNC in devname\n");
goto cifs_parse_mount_err;
default:
cifs_dbg(VFS, "Unknown error parsing devname\n");
goto cifs_parse_mount_err;
}
while ((data = strsep(&options, separator)) != NULL) {
substring_t args[MAX_OPT_ARGS];
unsigned long option;
int token;
if (!*data)
continue;
token = match_token(data, cifs_mount_option_tokens, args);
switch (token) {
/* Ingnore the following */
case Opt_ignore:
break;
/* Boolean values */
case Opt_user_xattr:
vol->no_xattr = 0;
break;
case Opt_nouser_xattr:
vol->no_xattr = 1;
break;
case Opt_forceuid:
override_uid = 1;
break;
case Opt_noforceuid:
override_uid = 0;
break;
case Opt_forcegid:
override_gid = 1;
break;
case Opt_noforcegid:
override_gid = 0;
break;
case Opt_noblocksend:
vol->noblocksnd = 1;
break;
case Opt_noautotune:
vol->noautotune = 1;
break;
case Opt_nolease:
vol->no_lease = 1;
break;
case Opt_hard:
vol->retry = 1;
break;
case Opt_soft:
vol->retry = 0;
break;
case Opt_perm:
vol->noperm = 0;
break;
case Opt_noperm:
vol->noperm = 1;
break;
case Opt_nodelete:
vol->nodelete = 1;
break;
case Opt_mapchars:
vol->sfu_remap = true;
vol->remap = false; /* disable SFM mapping */
break;
case Opt_nomapchars:
vol->sfu_remap = false;
break;
case Opt_mapposix:
vol->remap = true;
vol->sfu_remap = false; /* disable SFU mapping */
break;
case Opt_nomapposix:
vol->remap = false;
break;
case Opt_sfu:
vol->sfu_emul = 1;
break;
case Opt_nosfu:
vol->sfu_emul = 0;
break;
case Opt_nodfs:
vol->nodfs = 1;
break;
case Opt_rootfs:
#ifdef CONFIG_CIFS_ROOT
vol->rootfs = true;
#endif
break;
case Opt_posixpaths:
vol->posix_paths = 1;
break;
case Opt_noposixpaths:
vol->posix_paths = 0;
break;
case Opt_nounix:
if (vol->linux_ext)
cifs_dbg(VFS,
"conflicting unix mount options\n");
vol->no_linux_ext = 1;
break;
case Opt_unix:
if (vol->no_linux_ext)
cifs_dbg(VFS,
"conflicting unix mount options\n");
vol->linux_ext = 1;
break;
case Opt_nocase:
vol->nocase = 1;
break;
case Opt_brl:
vol->nobrl = 0;
break;
case Opt_nobrl:
vol->nobrl = 1;
/*
* turn off mandatory locking in mode
* if remote locking is turned off since the
* local vfs will do advisory
*/
if (vol->file_mode ==
(S_IALLUGO & ~(S_ISUID | S_IXGRP)))
vol->file_mode = S_IALLUGO;
break;
case Opt_nohandlecache:
vol->nohandlecache = 1;
break;
case Opt_handlecache:
vol->nohandlecache = 0;
break;
case Opt_forcemandatorylock:
vol->mand_lock = 1;
break;
case Opt_setuids:
vol->setuids = 1;
break;
case Opt_nosetuids:
vol->setuids = 0;
break;
case Opt_setuidfromacl:
vol->setuidfromacl = 1;
break;
case Opt_dynperm:
vol->dynperm = true;
break;
case Opt_nodynperm:
vol->dynperm = false;
break;
case Opt_nohard:
vol->retry = 0;
break;
case Opt_nosoft:
vol->retry = 1;
break;
case Opt_nointr:
vol->intr = 0;
break;
case Opt_intr:
vol->intr = 1;
break;
case Opt_nostrictsync:
vol->nostrictsync = 1;
break;
case Opt_strictsync:
vol->nostrictsync = 0;
break;
case Opt_serverino:
vol->server_ino = 1;
break;
case Opt_noserverino:
vol->server_ino = 0;
break;
case Opt_rwpidforward:
vol->rwpidforward = 1;
break;
case Opt_modesid:
vol->mode_ace = 1;
break;
case Opt_cifsacl:
vol->cifs_acl = 1;
break;
case Opt_nocifsacl:
vol->cifs_acl = 0;
break;
case Opt_acl:
vol->no_psx_acl = 0;
break;
case Opt_noacl:
vol->no_psx_acl = 1;
break;
case Opt_locallease:
vol->local_lease = 1;
break;
case Opt_sign:
vol->sign = true;
break;
case Opt_ignore_signature:
vol->sign = true;
vol->ignore_signature = true;
break;
case Opt_seal:
/* we do not do the following in secFlags because seal
* is a per tree connection (mount) not a per socket
* or per-smb connection option in the protocol
* vol->secFlg |= CIFSSEC_MUST_SEAL;
*/
vol->seal = 1;
break;
case Opt_noac:
pr_warn("Mount option noac not supported. Instead set /proc/fs/cifs/LookupCacheEnabled to 0\n");
break;
case Opt_fsc:
#ifndef CONFIG_CIFS_FSCACHE
cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n");
goto cifs_parse_mount_err;
#endif
vol->fsc = true;
break;
case Opt_mfsymlinks:
vol->mfsymlinks = true;
break;
case Opt_multiuser:
vol->multiuser = true;
break;
case Opt_sloppy:
sloppy = true;
break;
case Opt_nosharesock:
vol->nosharesock = true;
break;
case Opt_nopersistent:
vol->nopersistent = true;
if (vol->persistent) {
cifs_dbg(VFS,
"persistenthandles mount options conflict\n");
goto cifs_parse_mount_err;
}
break;
case Opt_persistent:
vol->persistent = true;
if ((vol->nopersistent) || (vol->resilient)) {
cifs_dbg(VFS,
"persistenthandles mount options conflict\n");
goto cifs_parse_mount_err;
}
break;
case Opt_resilient:
vol->resilient = true;
if (vol->persistent) {
cifs_dbg(VFS,
"persistenthandles mount options conflict\n");
goto cifs_parse_mount_err;
}
break;
case Opt_noresilient:
vol->resilient = false; /* already the default */
break;
case Opt_domainauto:
vol->domainauto = true;
break;
case Opt_rdma:
vol->rdma = true;
break;
case Opt_multichannel:
vol->multichannel = true;
/* if number of channels not specified, default to 2 */
if (vol->max_channels < 2)
vol->max_channels = 2;
break;
case Opt_nomultichannel:
vol->multichannel = false;
vol->max_channels = 1;
break;
case Opt_compress:
vol->compression = UNKNOWN_TYPE;
cifs_dbg(VFS,
"SMB3 compression support is experimental\n");
break;
/* Numeric Values */
case Opt_backupuid:
if (get_option_uid(args, &vol->backupuid)) {
cifs_dbg(VFS, "%s: Invalid backupuid value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->backupuid_specified = true;
break;
case Opt_backupgid:
if (get_option_gid(args, &vol->backupgid)) {
cifs_dbg(VFS, "%s: Invalid backupgid value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->backupgid_specified = true;
break;
case Opt_uid:
if (get_option_uid(args, &vol->linux_uid)) {
cifs_dbg(VFS, "%s: Invalid uid value\n",
__func__);
goto cifs_parse_mount_err;
}
uid_specified = true;
break;
case Opt_cruid:
if (get_option_uid(args, &vol->cred_uid)) {
cifs_dbg(VFS, "%s: Invalid cruid value\n",
__func__);
goto cifs_parse_mount_err;
}
break;
case Opt_gid:
if (get_option_gid(args, &vol->linux_gid)) {
cifs_dbg(VFS, "%s: Invalid gid value\n",
__func__);
goto cifs_parse_mount_err;
}
gid_specified = true;
break;
case Opt_file_mode:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid file_mode value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->file_mode = option;
break;
case Opt_dirmode:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid dir_mode value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->dir_mode = option;
break;
case Opt_port:
if (get_option_ul(args, &option) ||
option > USHRT_MAX) {
cifs_dbg(VFS, "%s: Invalid port value\n",
__func__);
goto cifs_parse_mount_err;
}
port = (unsigned short)option;
break;
case Opt_min_enc_offload:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "Invalid minimum encrypted read offload size (esize)\n");
goto cifs_parse_mount_err;
}
vol->min_offload = option;
break;
case Opt_blocksize:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid blocksize value\n",
__func__);
goto cifs_parse_mount_err;
}
/*
* inode blocksize realistically should never need to be
* less than 16K or greater than 16M and default is 1MB.
* Note that small inode block sizes (e.g. 64K) can lead
* to very poor performance of common tools like cp and scp
*/
if ((option < CIFS_MAX_MSGSIZE) ||
(option > (4 * SMB3_DEFAULT_IOSIZE))) {
cifs_dbg(VFS, "%s: Invalid blocksize\n",
__func__);
goto cifs_parse_mount_err;
}
vol->bsize = option;
break;
case Opt_rsize:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid rsize value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->rsize = option;
break;
case Opt_wsize:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid wsize value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->wsize = option;
break;
case Opt_actimeo:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid actimeo value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->actimeo = HZ * option;
if (vol->actimeo > CIFS_MAX_ACTIMEO) {
cifs_dbg(VFS, "attribute cache timeout too large\n");
goto cifs_parse_mount_err;
}
break;
case Opt_handletimeout:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid handletimeout value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->handle_timeout = option;
if (vol->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) {
cifs_dbg(VFS, "Invalid handle cache timeout, longer than 16 minutes\n");
goto cifs_parse_mount_err;
}
break;
case Opt_echo_interval:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid echo interval value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->echo_interval = option;
break;
case Opt_snapshot:
if (get_option_ul(args, &option)) {
cifs_dbg(VFS, "%s: Invalid snapshot time\n",
__func__);
goto cifs_parse_mount_err;
}
vol->snapshot_time = option;
break;
case Opt_max_credits:
if (get_option_ul(args, &option) || (option < 20) ||
(option > 60000)) {
cifs_dbg(VFS, "%s: Invalid max_credits value\n",
__func__);
goto cifs_parse_mount_err;
}
vol->max_credits = option;
break;
case Opt_max_channels:
if (get_option_ul(args, &option) || option < 1 ||
option > CIFS_MAX_CHANNELS) {
cifs_dbg(VFS, "%s: Invalid max_channels value, needs to be 1-%d\n",
__func__, CIFS_MAX_CHANNELS);
goto cifs_parse_mount_err;
}
vol->max_channels = option;
break;
/* String Arguments */
case Opt_blank_user:
/* null user, ie. anonymous authentication */
vol->nullauth = 1;
vol->username = NULL;
break;
case Opt_user:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (strnlen(string, CIFS_MAX_USERNAME_LEN) >
CIFS_MAX_USERNAME_LEN) {
pr_warn("username too long\n");
goto cifs_parse_mount_err;
}
kfree(vol->username);
vol->username = kstrdup(string, GFP_KERNEL);
if (!vol->username)
goto cifs_parse_mount_err;
break;
case Opt_blank_pass:
/* passwords have to be handled differently
* to allow the character used for deliminator
* to be passed within them
*/
/*
* Check if this is a case where the password
* starts with a delimiter
*/
tmp_end = strchr(data, '=');
tmp_end++;
if (!(tmp_end < end && tmp_end[1] == delim)) {
/* No it is not. Set the password to NULL */
kzfree(vol->password);
vol->password = NULL;
break;
}
/* Fallthrough - to Opt_pass below.*/
case Opt_pass:
/* Obtain the value string */
value = strchr(data, '=');
value++;
/* Set tmp_end to end of the string */
tmp_end = (char *) value + strlen(value);
/* Check if following character is the deliminator
* If yes, we have encountered a double deliminator
* reset the NULL character to the deliminator
*/
if (tmp_end < end && tmp_end[1] == delim) {
tmp_end[0] = delim;
/* Keep iterating until we get to a single
* deliminator OR the end
*/
while ((tmp_end = strchr(tmp_end, delim))
!= NULL && (tmp_end[1] == delim)) {
tmp_end = (char *) &tmp_end[2];
}
/* Reset var options to point to next element */
if (tmp_end) {
tmp_end[0] = '\0';
options = (char *) &tmp_end[1];
} else
/* Reached the end of the mount option
* string */
options = end;
}
kzfree(vol->password);
/* Now build new password string */
temp_len = strlen(value);
vol->password = kzalloc(temp_len+1, GFP_KERNEL);
if (vol->password == NULL) {
pr_warn("no memory for password\n");
goto cifs_parse_mount_err;
}
for (i = 0, j = 0; i < temp_len; i++, j++) {
vol->password[j] = value[i];
if ((value[i] == delim) &&
value[i+1] == delim)
/* skip the second deliminator */
i++;
}
vol->password[j] = '\0';
break;
case Opt_blank_ip:
/* FIXME: should this be an error instead? */
got_ip = false;
break;
case Opt_ip:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (!cifs_convert_address(dstaddr, string,
strlen(string))) {
pr_err("bad ip= option (%s)\n", string);
goto cifs_parse_mount_err;
}
got_ip = true;
break;
case Opt_domain:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (strnlen(string, CIFS_MAX_DOMAINNAME_LEN)
== CIFS_MAX_DOMAINNAME_LEN) {
pr_warn("domain name too long\n");
goto cifs_parse_mount_err;
}
kfree(vol->domainname);
vol->domainname = kstrdup(string, GFP_KERNEL);
if (!vol->domainname) {
pr_warn("no memory for domainname\n");
goto cifs_parse_mount_err;
}
cifs_dbg(FYI, "Domain name set\n");
break;
case Opt_srcaddr:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (!cifs_convert_address(
(struct sockaddr *)&vol->srcaddr,
string, strlen(string))) {
pr_warn("Could not parse srcaddr: %s\n",
string);
goto cifs_parse_mount_err;
}
break;
case Opt_iocharset:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (strnlen(string, 1024) >= 65) {
pr_warn("iocharset name too long\n");
goto cifs_parse_mount_err;
}
if (strncasecmp(string, "default", 7) != 0) {
kfree(vol->iocharset);
vol->iocharset = kstrdup(string,
GFP_KERNEL);
if (!vol->iocharset) {
pr_warn("no memory for charset\n");
goto cifs_parse_mount_err;
}
}
/* if iocharset not set then load_nls_default
* is used by caller
*/
cifs_dbg(FYI, "iocharset set to %s\n", string);
break;
case Opt_netbiosname:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
memset(vol->source_rfc1001_name, 0x20,
RFC1001_NAME_LEN);
/*
* FIXME: are there cases in which a comma can
* be valid in workstation netbios name (and
* need special handling)?
*/
for (i = 0; i < RFC1001_NAME_LEN; i++) {
/* don't ucase netbiosname for user */
if (string[i] == 0)
break;
vol->source_rfc1001_name[i] = string[i];
}
/* The string has 16th byte zero still from
* set at top of the function
*/
if (i == RFC1001_NAME_LEN && string[i] != 0)
pr_warn("netbiosname longer than 15 truncated\n");
break;
case Opt_servern:
/* servernetbiosname specified override *SMBSERVER */
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
/* last byte, type, is 0x20 for servr type */
memset(vol->target_rfc1001_name, 0x20,
RFC1001_NAME_LEN_WITH_NULL);
/* BB are there cases in which a comma can be
valid in this workstation netbios name
(and need special handling)? */
/* user or mount helper must uppercase the
netbios name */
for (i = 0; i < 15; i++) {
if (string[i] == 0)
break;
vol->target_rfc1001_name[i] = string[i];
}
/* The string has 16th byte zero still from
set at top of the function */
if (i == RFC1001_NAME_LEN && string[i] != 0)
pr_warn("server netbiosname longer than 15 truncated\n");
break;
case Opt_ver:
/* version of mount userspace tools, not dialect */
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
/* If interface changes in mount.cifs bump to new ver */
if (strncasecmp(string, "1", 1) == 0) {
if (strlen(string) > 1) {
pr_warn("Bad mount helper ver=%s. Did you want SMB1 (CIFS) dialect and mean to type vers=1.0 instead?\n",
string);
goto cifs_parse_mount_err;
}
/* This is the default */
break;
}
/* For all other value, error */
pr_warn("Invalid mount helper version specified\n");
goto cifs_parse_mount_err;
case Opt_vers:
/* protocol version (dialect) */
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (cifs_parse_smb_version(string, vol, is_smb3) != 0)
goto cifs_parse_mount_err;
got_version = true;
break;
case Opt_sec:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (cifs_parse_security_flavors(string, vol) != 0)
goto cifs_parse_mount_err;
break;
case Opt_cache:
string = match_strdup(args);
if (string == NULL)
goto out_nomem;
if (cifs_parse_cache_flavor(string, vol) != 0)
goto cifs_parse_mount_err;
break;
default:
/*
* An option we don't recognize. Save it off for later
* if we haven't already found one
*/
if (!invalid)
invalid = data;
break;
}
/* Free up any allocated string */
kfree(string);
string = NULL;
}
if (!sloppy && invalid) {
pr_err("Unknown mount option \"%s\"\n", invalid);
goto cifs_parse_mount_err;
}
if (vol->rdma && vol->vals->protocol_id < SMB30_PROT_ID) {
cifs_dbg(VFS, "SMB Direct requires Version >=3.0\n");
goto cifs_parse_mount_err;
}
#ifndef CONFIG_KEYS
/* Muliuser mounts require CONFIG_KEYS support */
if (vol->multiuser) {
cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n");
goto cifs_parse_mount_err;
}
#endif
if (!vol->UNC) {
cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string!\n");
goto cifs_parse_mount_err;
}
/* make sure UNC has a share name */
if (!strchr(vol->UNC + 3, '\\')) {
cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n");
goto cifs_parse_mount_err;
}
if (!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(&vol->UNC[2], '\\');
len = slash - &vol->UNC[2];
if (!cifs_convert_address(dstaddr, &vol->UNC[2], len)) {
pr_err("Unable to determine destination address\n");
goto cifs_parse_mount_err;
}
}
/* set the port that we got earlier */
cifs_set_port(dstaddr, port);
if (uid_specified)
vol->override_uid = override_uid;
else if (override_uid == 1)
pr_notice("ignoring forceuid mount option specified with no uid= option\n");
if (gid_specified)
vol->override_gid = override_gid;
else if (override_gid == 1)
pr_notice("ignoring forcegid mount option specified with no gid= option\n");
if (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");
kfree(mountdata_copy);
return 0;
out_nomem:
pr_warn("Could not allocate temporary buffer\n");
cifs_parse_mount_err:
kfree(string);
kfree(mountdata_copy);
return 1;
}
/** Returns true if srcaddr isn't specified and rhs isn't
* specified, or if srcaddr is specified and
* matches the IP address of the rhs argument.
*/
bool
cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs)
{
switch (srcaddr->sa_family) {
case AF_UNSPEC:
return (rhs->sa_family == AF_UNSPEC);
case AF_INET: {
struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr;
struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs;
return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr);
}
case AF_INET6: {
struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr;
struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs;
return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr);
}
default:
WARN_ON(1);
return false; /* don't expect to be here */
}
}
/*
* If no port is specified in addr structure, we try to match with 445 port
* and if it fails - with 139 ports. It should be called only if address
* families of server and addr are equal.
*/
static bool
match_port(struct TCP_Server_Info *server, struct sockaddr *addr)
{
__be16 port, *sport;
/* SMBDirect manages its own ports, don't match it here */
if (server->rdma)
return true;
switch (addr->sa_family) {
case AF_INET:
sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port;
port = ((struct sockaddr_in *) addr)->sin_port;
break;
case AF_INET6:
sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port;
port = ((struct sockaddr_in6 *) addr)->sin6_port;
break;
default:
WARN_ON(1);
return false;
}
if (!port) {
port = htons(CIFS_PORT);
if (port == *sport)
return true;
port = htons(RFC1001_PORT);
}
return port == *sport;
}
static bool
match_address(struct TCP_Server_Info *server, struct sockaddr *addr,
struct sockaddr *srcaddr)
{
switch (addr->sa_family) {
case AF_INET: {
struct sockaddr_in *addr4 = (struct sockaddr_in *)addr;
struct sockaddr_in *srv_addr4 =
(struct sockaddr_in *)&server->dstaddr;
if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr)
return false;
break;
}
case AF_INET6: {
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr;
struct sockaddr_in6 *srv_addr6 =
(struct sockaddr_in6 *)&server->dstaddr;
if (!ipv6_addr_equal(&addr6->sin6_addr,
&srv_addr6->sin6_addr))
return false;
if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id)
return false;
break;
}
default:
WARN_ON(1);
return false; /* don't expect to be here */
}
if (!cifs_match_ipaddr(srcaddr, (struct sockaddr *)&server->srcaddr))
return false;
return true;
}
static bool
match_security(struct TCP_Server_Info *server, struct smb_vol *vol)
{
/*
* The select_sectype function should either return the vol->sectype
* that was specified, or "Unspecified" if that sectype was not
* compatible with the given NEGOTIATE request.
*/
if (server->ops->select_sectype(server, vol->sectype)
== Unspecified)
return false;
/*
* Now check if signing mode is acceptable. No need to check
* global_secflags at this point since if MUST_SIGN is set then
* the server->sign had better be too.
*/
if (vol->sign && !server->sign)
return false;
return true;
}
static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol)
{
struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr;
if (vol->nosharesock)
return 0;
/* If multidialect negotiation see if existing sessions match one */
if (strcmp(vol->vals->version_string, SMB3ANY_VERSION_STRING) == 0) {
if (server->vals->protocol_id < SMB30_PROT_ID)
return 0;
} else if (strcmp(vol->vals->version_string,
SMBDEFAULT_VERSION_STRING) == 0) {
if (server->vals->protocol_id < SMB21_PROT_ID)
return 0;
} else if ((server->vals != vol->vals) || (server->ops != vol->ops))
return 0;
if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns))
return 0;
if (!match_address(server, addr,
(struct sockaddr *)&vol->srcaddr))
return 0;
if (!match_port(server, addr))
return 0;
if (!match_security(server, vol))
return 0;
if (server->echo_interval != vol->echo_interval * HZ)
return 0;
if (server->rdma != vol->rdma)
return 0;
if (server->ignore_signature != vol->ignore_signature)
return 0;
if (server->min_offload != vol->min_offload)
return 0;
return 1;
}
struct TCP_Server_Info *
cifs_find_tcp_session(struct smb_vol *vol)
{
struct TCP_Server_Info *server;
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
/*
* Skip ses channels since they're only handled in lower layers
* (e.g. cifs_send_recv).
*/
if (server->is_channel || !match_server(server, vol))
continue;
++server->srv_count;
spin_unlock(&cifs_tcp_ses_lock);
cifs_dbg(FYI, "Existing tcp session with server found\n");
return server;
}
spin_unlock(&cifs_tcp_ses_lock);
return NULL;
}
void
cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect)
{
struct task_struct *task;
spin_lock(&cifs_tcp_ses_lock);
if (--server->srv_count > 0) {
spin_unlock(&cifs_tcp_ses_lock);
return;
}
put_net(cifs_net_ns(server));
list_del_init(&server->tcp_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
cancel_delayed_work_sync(&server->echo);
if (from_reconnect)
/*
* Avoid deadlock here: reconnect work calls
* cifs_put_tcp_session() at its end. Need to be sure
* that reconnect work does nothing with server pointer after
* that step.
*/
cancel_delayed_work(&server->reconnect);
else
cancel_delayed_work_sync(&server->reconnect);
spin_lock(&GlobalMid_Lock);
server->tcpStatus = CifsExiting;
spin_unlock(&GlobalMid_Lock);
cifs_crypto_secmech_release(server);
cifs_fscache_release_client_cookie(server);
kfree(server->session_key.response);
server->session_key.response = NULL;
server->session_key.len = 0;
task = xchg(&server->tsk, NULL);
if (task)
send_sig(SIGKILL, task, 1);
}
struct TCP_Server_Info *
cifs_get_tcp_session(struct smb_vol *volume_info)
{
struct TCP_Server_Info *tcp_ses = NULL;
int rc;
cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC);
/* see if we already have a matching tcp_ses */
tcp_ses = cifs_find_tcp_session(volume_info);
if (tcp_ses)
return tcp_ses;
tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL);
if (!tcp_ses) {
rc = -ENOMEM;
goto out_err;
}
tcp_ses->ops = volume_info->ops;
tcp_ses->vals = volume_info->vals;
cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
tcp_ses->hostname = extract_hostname(volume_info->UNC);
if (IS_ERR(tcp_ses->hostname)) {
rc = PTR_ERR(tcp_ses->hostname);
goto out_err_crypto_release;
}
tcp_ses->noblockcnt = volume_info->rootfs;
tcp_ses->noblocksnd = volume_info->noblocksnd || volume_info->rootfs;
tcp_ses->noautotune = volume_info->noautotune;
tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
tcp_ses->rdma = volume_info->rdma;
tcp_ses->in_flight = 0;
tcp_ses->max_in_flight = 0;
tcp_ses->credits = 1;
init_waitqueue_head(&tcp_ses->response_q);
init_waitqueue_head(&tcp_ses->request_q);
INIT_LIST_HEAD(&tcp_ses->pending_mid_q);
mutex_init(&tcp_ses->srv_mutex);
memcpy(tcp_ses->workstation_RFC1001_name,
volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
memcpy(tcp_ses->server_RFC1001_name,
volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
tcp_ses->session_estab = false;
tcp_ses->sequence_number = 0;
tcp_ses->reconnect_instance = 1;
tcp_ses->lstrp = jiffies;
tcp_ses->compress_algorithm = cpu_to_le16(volume_info->compression);
spin_lock_init(&tcp_ses->req_lock);
INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request);
INIT_DELAYED_WORK(&tcp_ses->reconnect, smb2_reconnect_server);
mutex_init(&tcp_ses->reconnect_mutex);
memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr,
sizeof(tcp_ses->srcaddr));
memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,
sizeof(tcp_ses->dstaddr));
if (volume_info->use_client_guid)
memcpy(tcp_ses->client_guid, volume_info->client_guid,
SMB2_CLIENT_GUID_SIZE);
else
generate_random_uuid(tcp_ses->client_guid);
/*
* at this point we are the only ones with the pointer
* to the struct since the kernel thread not created yet
* no need to spinlock this init of tcpStatus or srv_count
*/
tcp_ses->tcpStatus = CifsNew;
++tcp_ses->srv_count;
if (volume_info->echo_interval >= SMB_ECHO_INTERVAL_MIN &&
volume_info->echo_interval <= SMB_ECHO_INTERVAL_MAX)
tcp_ses->echo_interval = volume_info->echo_interval * HZ;
else
tcp_ses->echo_interval = SMB_ECHO_INTERVAL_DEFAULT * HZ;
if (tcp_ses->rdma) {
#ifndef CONFIG_CIFS_SMB_DIRECT
cifs_dbg(VFS, "CONFIG_CIFS_SMB_DIRECT is not enabled\n");
rc = -ENOENT;
goto out_err_crypto_release;
#endif
tcp_ses->smbd_conn = smbd_get_connection(
tcp_ses, (struct sockaddr *)&volume_info->dstaddr);
if (tcp_ses->smbd_conn) {
cifs_dbg(VFS, "RDMA transport established\n");
rc = 0;
goto smbd_connected;
} else {
rc = -ENOENT;
goto out_err_crypto_release;
}
}
rc = ip_connect(tcp_ses);
if (rc < 0) {
cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n");
goto out_err_crypto_release;
}
smbd_connected:
/*
* since we're in a cifs function already, we know that
* this will succeed. No need for try_module_get().
*/
__module_get(THIS_MODULE);
tcp_ses->tsk = kthread_run(cifs_demultiplex_thread,
tcp_ses, "cifsd");
if (IS_ERR(tcp_ses->tsk)) {
rc = PTR_ERR(tcp_ses->tsk);
cifs_dbg(VFS, "error %d create cifsd thread\n", rc);
module_put(THIS_MODULE);
goto out_err_crypto_release;
}
tcp_ses->min_offload = volume_info->min_offload;
tcp_ses->tcpStatus = CifsNeedNegotiate;
tcp_ses->nr_targets = 1;
tcp_ses->ignore_signature = volume_info->ignore_signature;
/* thread spawned, put it on the list */
spin_lock(&cifs_tcp_ses_lock);
list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list);
spin_unlock(&cifs_tcp_ses_lock);
cifs_fscache_get_client_cookie(tcp_ses);
/* queue echo request delayed work */
queue_delayed_work(cifsiod_wq, &tcp_ses->echo, tcp_ses->echo_interval);
return tcp_ses;
out_err_crypto_release:
cifs_crypto_secmech_release(tcp_ses);
put_net(cifs_net_ns(tcp_ses));
out_err:
if (tcp_ses) {
if (!IS_ERR(tcp_ses->hostname))
kfree(tcp_ses->hostname);
if (tcp_ses->ssocket)
sock_release(tcp_ses->ssocket);
kfree(tcp_ses);
}
return ERR_PTR(rc);
}
static int match_session(struct cifs_ses *ses, struct smb_vol *vol)
{
if (vol->sectype != Unspecified &&
vol->sectype != ses->sectype)
return 0;
/*
* If an existing session is limited to less channels than
* requested, it should not be reused
*/
if (ses->chan_max < vol->max_channels)
return 0;
switch (ses->sectype) {
case Kerberos:
if (!uid_eq(vol->cred_uid, ses->cred_uid))
return 0;
break;
default:
/* NULL username means anonymous session */
if (ses->user_name == NULL) {
if (!vol->nullauth)
return 0;
break;
}
/* anything else takes username/password */
if (strncmp(ses->user_name,
vol->username ? vol->username : "",
CIFS_MAX_USERNAME_LEN))
return 0;
if ((vol->username && strlen(vol->username) != 0) &&
ses->password != NULL &&
strncmp(ses->password,
vol->password ? vol->password : "",
CIFS_MAX_PASSWORD_LEN))
return 0;
}
return 1;
}
/**
* cifs_setup_ipc - helper to setup the IPC tcon for the session
*
* A new IPC connection is made and stored in the session
* tcon_ipc. The IPC tcon has the same lifetime as the session.
*/
static int
cifs_setup_ipc(struct cifs_ses *ses, struct smb_vol *volume_info)
{
int rc = 0, xid;
struct cifs_tcon *tcon;
struct nls_table *nls_codepage;
char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0};
bool seal = false;
struct TCP_Server_Info *server = ses->server;
/*
* If the mount request that resulted in the creation of the
* session requires encryption, force IPC to be encrypted too.
*/
if (volume_info->seal) {
if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)
seal = true;
else {
cifs_server_dbg(VFS,
"IPC: server doesn't support encryption\n");
return -EOPNOTSUPP;
}
}
tcon = tconInfoAlloc();
if (tcon == NULL)
return -ENOMEM;
scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname);
/* cannot fail */
nls_codepage = load_nls_default();
xid = get_xid();
tcon->ses = ses;
tcon->ipc = true;
tcon->seal = seal;
rc = server->ops->tree_connect(xid, ses, unc, tcon, nls_codepage);
free_xid(xid);
if (rc) {
cifs_server_dbg(VFS, "failed to connect to IPC (rc=%d)\n", rc);
tconInfoFree(tcon);
goto out;
}
cifs_dbg(FYI, "IPC tcon rc = %d ipc tid = %d\n", rc, tcon->tid);
ses->tcon_ipc = tcon;
out:
unload_nls(nls_codepage);
return rc;
}
/**
* cifs_free_ipc - helper to release the session IPC tcon
*
* Needs to be called everytime a session is destroyed
*/
static int
cifs_free_ipc(struct cifs_ses *ses)
{
int rc = 0, xid;
struct cifs_tcon *tcon = ses->tcon_ipc;
if (tcon == NULL)
return 0;
if (ses->server->ops->tree_disconnect) {
xid = get_xid();
rc = ses->server->ops->tree_disconnect(xid, tcon);
free_xid(xid);
}
if (rc)
cifs_dbg(FYI, "failed to disconnect IPC tcon (rc=%d)\n", rc);
tconInfoFree(tcon);
ses->tcon_ipc = NULL;
return rc;
}
static struct cifs_ses *
cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol)
{
struct cifs_ses *ses;
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
if (ses->status == CifsExiting)
continue;
if (!match_session(ses, vol))
continue;
++ses->ses_count;
spin_unlock(&cifs_tcp_ses_lock);
return ses;
}
spin_unlock(&cifs_tcp_ses_lock);
return NULL;
}
void cifs_put_smb_ses(struct cifs_ses *ses)
{
unsigned int rc, xid;
struct TCP_Server_Info *server = ses->server;
cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
spin_lock(&cifs_tcp_ses_lock);
if (ses->status == CifsExiting) {
spin_unlock(&cifs_tcp_ses_lock);
return;
}
if (--ses->ses_count >