ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/fs/cifs/connect.c b/marvell/linux/fs/cifs/connect.c
new file mode 100644
index 0000000..d8d9d90
--- /dev/null
+++ b/marvell/linux/fs/cifs/connect.c
@@ -0,0 +1,5516 @@
+/*
+ * 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/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"
+#include "cifsfs.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_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_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,
+
+ /* 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_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_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_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
+struct super_cb_data {
+ struct TCP_Server_Info *server;
+ struct super_block *sb;
+};
+
+/* These functions must be called with server->srv_mutex held */
+
+static void super_cb(struct super_block *sb, void *arg)
+{
+ struct super_cb_data *d = arg;
+ struct cifs_sb_info *cifs_sb;
+ struct cifs_tcon *tcon;
+
+ if (d->sb)
+ return;
+
+ cifs_sb = CIFS_SB(sb);
+ tcon = cifs_sb_master_tcon(cifs_sb);
+ if (tcon->ses->server == d->server)
+ d->sb = sb;
+}
+
+static struct super_block *get_tcp_super(struct TCP_Server_Info *server)
+{
+ struct super_cb_data d = {
+ .server = server,
+ .sb = NULL,
+ };
+
+ iterate_supers_type(&cifs_fs_type, super_cb, &d);
+
+ if (unlikely(!d.sb))
+ return ERR_PTR(-ENOENT);
+ /*
+ * Grab an active reference in order to prevent automounts (DFS links)
+ * of expiring and then freeing up our cifs superblock pointer while
+ * we're doing failover.
+ */
+ cifs_sb_active(d.sb);
+ return d.sb;
+}
+
+static inline void put_tcp_super(struct super_block *sb)
+{
+ if (!IS_ERR_OR_NULL(sb))
+ cifs_sb_deactive(sb);
+}
+
+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 = 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) {
+ cifs_sb = NULL;
+ if (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);
+ put_tcp_super(sb);
+#endif
+ 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);
+
+ }
+
+ put_tcp_super(sb);
+#endif
+ if (server->tcpStatus == CifsNeedNegotiate)
+ mod_delayed_work(cifsiod_wq, &server->echo, 0);
+
+ 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);
+ wake_up(&server->response_q);
+ 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;
+
+ 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);
+ wake_up(&server->response_q);
+ 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)
+ printk_once(KERN_WARNING
+ "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);
+
+ cancel_delayed_work_sync(&server->echo);
+
+ 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);
+ wake_up(&server->response_q);
+ 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);
+ wake_up(&server->response_q);
+ 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];
+
+ current->flags |= PF_MEMALLOC;
+ 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);
+ wake_up(&server->response_q);
+ 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);
+ }
+
+ 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;
+ }
+ 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;
+
+ 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_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("CIFS: 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_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;
+
+ /* 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("CIFS: 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("CIFS: 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("CIFS: 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("CIFS: domain name too long\n");
+ goto cifs_parse_mount_err;
+ }
+
+ kfree(vol->domainname);
+ vol->domainname = kstrdup(string, GFP_KERNEL);
+ if (!vol->domainname) {
+ pr_warn("CIFS: 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("CIFS: 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("CIFS: 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("CIFS: 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("CIFS: 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("CIFS: 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("CIFS: 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("CIFS: 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("CIFS: 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("CIFS: ignoring forcegid mount option specified with no gid= option.\n");
+
+ if (got_version == false)
+ pr_warn("No dialect specified on mount. Default has changed to "
+ "a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS "
+ "(SMB1). To use the less secure SMB1 dialect to access "
+ "old servers which do not support 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.
+ */
+static bool
+srcip_matches(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 (!srcip_matches(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) {
+ if (!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);
+}
+
+static 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));
+ 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;
+
+ 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 > 0) {
+ spin_unlock(&cifs_tcp_ses_lock);
+ return;
+ }
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ spin_lock(&GlobalMid_Lock);
+ if (ses->status == CifsGood)
+ ses->status = CifsExiting;
+ spin_unlock(&GlobalMid_Lock);
+
+ cifs_free_ipc(ses);
+
+ if (ses->status == CifsExiting && server->ops->logoff) {
+ xid = get_xid();
+ rc = server->ops->logoff(xid, ses);
+ if (rc)
+ cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n",
+ __func__, rc);
+ _free_xid(xid);
+ }
+
+ spin_lock(&cifs_tcp_ses_lock);
+ list_del_init(&ses->smb_ses_list);
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ sesInfoFree(ses);
+ cifs_put_tcp_session(server, 0);
+}
+
+#ifdef CONFIG_KEYS
+
+/* strlen("cifs:a:") + CIFS_MAX_DOMAINNAME_LEN + 1 */
+#define CIFSCREDS_DESC_SIZE (7 + CIFS_MAX_DOMAINNAME_LEN + 1)
+
+/* Populate username and pw fields from keyring if possible */
+static int
+cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses)
+{
+ int rc = 0;
+ int is_domain = 0;
+ const char *delim, *payload;
+ char *desc;
+ ssize_t len;
+ struct key *key;
+ struct TCP_Server_Info *server = ses->server;
+ struct sockaddr_in *sa;
+ struct sockaddr_in6 *sa6;
+ const struct user_key_payload *upayload;
+
+ desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL);
+ if (!desc)
+ return -ENOMEM;
+
+ /* try to find an address key first */
+ switch (server->dstaddr.ss_family) {
+ case AF_INET:
+ sa = (struct sockaddr_in *)&server->dstaddr;
+ sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr);
+ break;
+ case AF_INET6:
+ sa6 = (struct sockaddr_in6 *)&server->dstaddr;
+ sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr);
+ break;
+ default:
+ cifs_dbg(FYI, "Bad ss_family (%hu)\n",
+ server->dstaddr.ss_family);
+ rc = -EINVAL;
+ goto out_err;
+ }
+
+ cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
+ key = request_key(&key_type_logon, desc, "");
+ if (IS_ERR(key)) {
+ if (!ses->domainName) {
+ cifs_dbg(FYI, "domainName is NULL\n");
+ rc = PTR_ERR(key);
+ goto out_err;
+ }
+
+ /* didn't work, try to find a domain key */
+ sprintf(desc, "cifs:d:%s", ses->domainName);
+ cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc);
+ key = request_key(&key_type_logon, desc, "");
+ if (IS_ERR(key)) {
+ rc = PTR_ERR(key);
+ goto out_err;
+ }
+ is_domain = 1;
+ }
+
+ down_read(&key->sem);
+ upayload = user_key_payload_locked(key);
+ if (IS_ERR_OR_NULL(upayload)) {
+ rc = upayload ? PTR_ERR(upayload) : -EINVAL;
+ goto out_key_put;
+ }
+
+ /* find first : in payload */
+ payload = upayload->data;
+ delim = strnchr(payload, upayload->datalen, ':');
+ cifs_dbg(FYI, "payload=%s\n", payload);
+ if (!delim) {
+ cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n",
+ upayload->datalen);
+ rc = -EINVAL;
+ goto out_key_put;
+ }
+
+ len = delim - payload;
+ if (len > CIFS_MAX_USERNAME_LEN || len <= 0) {
+ cifs_dbg(FYI, "Bad value from username search (len=%zd)\n",
+ len);
+ rc = -EINVAL;
+ goto out_key_put;
+ }
+
+ vol->username = kstrndup(payload, len, GFP_KERNEL);
+ if (!vol->username) {
+ cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n",
+ len);
+ rc = -ENOMEM;
+ goto out_key_put;
+ }
+ cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username);
+
+ len = key->datalen - (len + 1);
+ if (len > CIFS_MAX_PASSWORD_LEN || len <= 0) {
+ cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len);
+ rc = -EINVAL;
+ kfree(vol->username);
+ vol->username = NULL;
+ goto out_key_put;
+ }
+
+ ++delim;
+ vol->password = kstrndup(delim, len, GFP_KERNEL);
+ if (!vol->password) {
+ cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n",
+ len);
+ rc = -ENOMEM;
+ kfree(vol->username);
+ vol->username = NULL;
+ goto out_key_put;
+ }
+
+ /*
+ * If we have a domain key then we must set the domainName in the
+ * for the request.
+ */
+ if (is_domain && ses->domainName) {
+ vol->domainname = kstrndup(ses->domainName,
+ strlen(ses->domainName),
+ GFP_KERNEL);
+ if (!vol->domainname) {
+ cifs_dbg(FYI, "Unable to allocate %zd bytes for "
+ "domain\n", len);
+ rc = -ENOMEM;
+ kfree(vol->username);
+ vol->username = NULL;
+ kzfree(vol->password);
+ vol->password = NULL;
+ goto out_key_put;
+ }
+ }
+
+out_key_put:
+ up_read(&key->sem);
+ key_put(key);
+out_err:
+ kfree(desc);
+ cifs_dbg(FYI, "%s: returning %d\n", __func__, rc);
+ return rc;
+}
+#else /* ! CONFIG_KEYS */
+static inline int
+cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)),
+ struct cifs_ses *ses __attribute__((unused)))
+{
+ return -ENOSYS;
+}
+#endif /* CONFIG_KEYS */
+
+/**
+ * cifs_get_smb_ses - get a session matching @volume_info data from @server
+ *
+ * This function assumes it is being called from cifs_mount() where we
+ * already got a server reference (server refcount +1). See
+ * cifs_get_tcon() for refcount explanations.
+ */
+struct cifs_ses *
+cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
+{
+ int rc = 0;
+ unsigned int xid;
+ struct cifs_ses *ses;
+ struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
+ struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
+
+ xid = get_xid();
+
+ ses = cifs_find_smb_ses(server, volume_info);
+ if (ses) {
+ cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
+ ses->status);
+
+ mutex_lock(&ses->session_mutex);
+ rc = cifs_negotiate_protocol(xid, ses);
+ if (rc) {
+ mutex_unlock(&ses->session_mutex);
+ /* problem -- put our ses reference */
+ cifs_put_smb_ses(ses);
+ free_xid(xid);
+ return ERR_PTR(rc);
+ }
+ if (ses->need_reconnect) {
+ cifs_dbg(FYI, "Session needs reconnect\n");
+ rc = cifs_setup_session(xid, ses,
+ volume_info->local_nls);
+ if (rc) {
+ mutex_unlock(&ses->session_mutex);
+ /* problem -- put our reference */
+ cifs_put_smb_ses(ses);
+ free_xid(xid);
+ return ERR_PTR(rc);
+ }
+ }
+ mutex_unlock(&ses->session_mutex);
+
+ /* existing SMB ses has a server reference already */
+ cifs_put_tcp_session(server, 0);
+ free_xid(xid);
+ return ses;
+ }
+
+ rc = -ENOMEM;
+
+ cifs_dbg(FYI, "Existing smb sess not found\n");
+ ses = sesInfoAlloc();
+ if (ses == NULL)
+ goto get_ses_fail;
+
+ /* new SMB session uses our server ref */
+ ses->server = server;
+ if (server->dstaddr.ss_family == AF_INET6)
+ sprintf(ses->serverName, "%pI6", &addr6->sin6_addr);
+ else
+ sprintf(ses->serverName, "%pI4", &addr->sin_addr);
+
+ if (volume_info->username) {
+ ses->user_name = kstrdup(volume_info->username, GFP_KERNEL);
+ if (!ses->user_name)
+ goto get_ses_fail;
+ }
+
+ /* volume_info->password freed at unmount */
+ if (volume_info->password) {
+ ses->password = kstrdup(volume_info->password, GFP_KERNEL);
+ if (!ses->password)
+ goto get_ses_fail;
+ }
+ if (volume_info->domainname) {
+ ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL);
+ if (!ses->domainName)
+ goto get_ses_fail;
+ }
+ if (volume_info->domainauto)
+ ses->domainAuto = volume_info->domainauto;
+ ses->cred_uid = volume_info->cred_uid;
+ ses->linux_uid = volume_info->linux_uid;
+
+ ses->sectype = volume_info->sectype;
+ ses->sign = volume_info->sign;
+ mutex_lock(&ses->session_mutex);
+ rc = cifs_negotiate_protocol(xid, ses);
+ if (!rc)
+ rc = cifs_setup_session(xid, ses, volume_info->local_nls);
+ mutex_unlock(&ses->session_mutex);
+ if (rc)
+ goto get_ses_fail;
+
+ /* success, put it on the list */
+ spin_lock(&cifs_tcp_ses_lock);
+ list_add(&ses->smb_ses_list, &server->smb_ses_list);
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ free_xid(xid);
+
+ cifs_setup_ipc(ses, volume_info);
+
+ return ses;
+
+get_ses_fail:
+ sesInfoFree(ses);
+ free_xid(xid);
+ return ERR_PTR(rc);
+}
+
+static int match_tcon(struct cifs_tcon *tcon, struct smb_vol *volume_info)
+{
+ if (tcon->tidStatus == CifsExiting)
+ return 0;
+ if (strncmp(tcon->treeName, volume_info->UNC, MAX_TREE_SIZE))
+ return 0;
+ if (tcon->seal != volume_info->seal)
+ return 0;
+ if (tcon->snapshot_time != volume_info->snapshot_time)
+ return 0;
+ if (tcon->handle_timeout != volume_info->handle_timeout)
+ return 0;
+ if (tcon->no_lease != volume_info->no_lease)
+ return 0;
+ return 1;
+}
+
+static struct cifs_tcon *
+cifs_find_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
+{
+ struct list_head *tmp;
+ struct cifs_tcon *tcon;
+
+ spin_lock(&cifs_tcp_ses_lock);
+ list_for_each(tmp, &ses->tcon_list) {
+ tcon = list_entry(tmp, struct cifs_tcon, tcon_list);
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ if (tcon->dfs_path)
+ continue;
+#endif
+ if (!match_tcon(tcon, volume_info))
+ continue;
+ ++tcon->tc_count;
+ spin_unlock(&cifs_tcp_ses_lock);
+ return tcon;
+ }
+ spin_unlock(&cifs_tcp_ses_lock);
+ return NULL;
+}
+
+void
+cifs_put_tcon(struct cifs_tcon *tcon)
+{
+ unsigned int xid;
+ struct cifs_ses *ses;
+
+ /*
+ * IPC tcon share the lifetime of their session and are
+ * destroyed in the session put function
+ */
+ if (tcon == NULL || tcon->ipc)
+ return;
+
+ ses = tcon->ses;
+ cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count);
+ spin_lock(&cifs_tcp_ses_lock);
+ if (--tcon->tc_count > 0) {
+ spin_unlock(&cifs_tcp_ses_lock);
+ return;
+ }
+
+ list_del_init(&tcon->tcon_list);
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ xid = get_xid();
+ if (ses->server->ops->tree_disconnect)
+ ses->server->ops->tree_disconnect(xid, tcon);
+ _free_xid(xid);
+
+ cifs_fscache_release_super_cookie(tcon);
+ tconInfoFree(tcon);
+ cifs_put_smb_ses(ses);
+}
+
+/**
+ * cifs_get_tcon - get a tcon matching @volume_info data from @ses
+ *
+ * - tcon refcount is the number of mount points using the tcon.
+ * - ses refcount is the number of tcon using the session.
+ *
+ * 1. This function assumes it is being called from cifs_mount() where
+ * we already got a session reference (ses refcount +1).
+ *
+ * 2. Since we're in the context of adding a mount point, the end
+ * result should be either:
+ *
+ * a) a new tcon already allocated with refcount=1 (1 mount point) and
+ * its session refcount incremented (1 new tcon). This +1 was
+ * already done in (1).
+ *
+ * b) an existing tcon with refcount+1 (add a mount point to it) and
+ * identical ses refcount (no new tcon). Because of (1) we need to
+ * decrement the ses refcount.
+ */
+static struct cifs_tcon *
+cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info)
+{
+ int rc, xid;
+ struct cifs_tcon *tcon;
+
+ tcon = cifs_find_tcon(ses, volume_info);
+ if (tcon) {
+ /*
+ * tcon has refcount already incremented but we need to
+ * decrement extra ses reference gotten by caller (case b)
+ */
+ cifs_dbg(FYI, "Found match on UNC path\n");
+ cifs_put_smb_ses(ses);
+ return tcon;
+ }
+
+ if (!ses->server->ops->tree_connect) {
+ rc = -ENOSYS;
+ goto out_fail;
+ }
+
+ tcon = tconInfoAlloc();
+ if (tcon == NULL) {
+ rc = -ENOMEM;
+ goto out_fail;
+ }
+
+ if (volume_info->snapshot_time) {
+ if (ses->server->vals->protocol_id == 0) {
+ cifs_dbg(VFS,
+ "Use SMB2 or later for snapshot mount option\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ } else
+ tcon->snapshot_time = volume_info->snapshot_time;
+ }
+
+ if (volume_info->handle_timeout) {
+ if (ses->server->vals->protocol_id == 0) {
+ cifs_dbg(VFS,
+ "Use SMB2.1 or later for handle timeout option\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ } else
+ tcon->handle_timeout = volume_info->handle_timeout;
+ }
+
+ tcon->ses = ses;
+ if (volume_info->password) {
+ tcon->password = kstrdup(volume_info->password, GFP_KERNEL);
+ if (!tcon->password) {
+ rc = -ENOMEM;
+ goto out_fail;
+ }
+ }
+
+ if (volume_info->seal) {
+ if (ses->server->vals->protocol_id == 0) {
+ cifs_dbg(VFS,
+ "SMB3 or later required for encryption\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ } else if (tcon->ses->server->capabilities &
+ SMB2_GLOBAL_CAP_ENCRYPTION)
+ tcon->seal = true;
+ else {
+ cifs_dbg(VFS, "Encryption is not supported on share\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ }
+ }
+
+ if (volume_info->linux_ext) {
+ if (ses->server->posix_ext_supported) {
+ tcon->posix_extensions = true;
+ printk_once(KERN_WARNING
+ "SMB3.11 POSIX Extensions are experimental\n");
+ } else {
+ cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions.\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ }
+ }
+
+ /*
+ * BB Do we need to wrap session_mutex around this TCon call and Unix
+ * SetFS as we do on SessSetup and reconnect?
+ */
+ xid = get_xid();
+ rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon,
+ volume_info->local_nls);
+ free_xid(xid);
+ cifs_dbg(FYI, "Tcon rc = %d\n", rc);
+ if (rc)
+ goto out_fail;
+
+ tcon->use_persistent = false;
+ /* check if SMB2 or later, CIFS does not support persistent handles */
+ if (volume_info->persistent) {
+ if (ses->server->vals->protocol_id == 0) {
+ cifs_dbg(VFS,
+ "SMB3 or later required for persistent handles\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ } else if (ses->server->capabilities &
+ SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
+ tcon->use_persistent = true;
+ else /* persistent handles requested but not supported */ {
+ cifs_dbg(VFS,
+ "Persistent handles not supported on share\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ }
+ } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY)
+ && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES)
+ && (volume_info->nopersistent == false)) {
+ cifs_dbg(FYI, "enabling persistent handles\n");
+ tcon->use_persistent = true;
+ } else if (volume_info->resilient) {
+ if (ses->server->vals->protocol_id == 0) {
+ cifs_dbg(VFS,
+ "SMB2.1 or later required for resilient handles\n");
+ rc = -EOPNOTSUPP;
+ goto out_fail;
+ }
+ tcon->use_resilient = true;
+ }
+
+ /* If the user really knows what they are doing they can override */
+ if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) {
+ if (volume_info->cache_ro)
+ cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n");
+ else if (volume_info->cache_rw)
+ cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n");
+ }
+
+ /*
+ * We can have only one retry value for a connection to a share so for
+ * resources mounted more than once to the same server share the last
+ * value passed in for the retry flag is used.
+ */
+ tcon->retry = volume_info->retry;
+ tcon->nocase = volume_info->nocase;
+ tcon->nohandlecache = volume_info->nohandlecache;
+ tcon->local_lease = volume_info->local_lease;
+ tcon->no_lease = volume_info->no_lease;
+ INIT_LIST_HEAD(&tcon->pending_opens);
+
+ spin_lock(&cifs_tcp_ses_lock);
+ list_add(&tcon->tcon_list, &ses->tcon_list);
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ cifs_fscache_get_super_cookie(tcon);
+
+ return tcon;
+
+out_fail:
+ tconInfoFree(tcon);
+ return ERR_PTR(rc);
+}
+
+void
+cifs_put_tlink(struct tcon_link *tlink)
+{
+ if (!tlink || IS_ERR(tlink))
+ return;
+
+ if (!atomic_dec_and_test(&tlink->tl_count) ||
+ test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) {
+ tlink->tl_time = jiffies;
+ return;
+ }
+
+ if (!IS_ERR(tlink_tcon(tlink)))
+ cifs_put_tcon(tlink_tcon(tlink));
+ kfree(tlink);
+ return;
+}
+
+static int
+compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
+{
+ struct cifs_sb_info *old = CIFS_SB(sb);
+ struct cifs_sb_info *new = mnt_data->cifs_sb;
+ unsigned int oldflags = old->mnt_cifs_flags & CIFS_MOUNT_MASK;
+ unsigned int newflags = new->mnt_cifs_flags & CIFS_MOUNT_MASK;
+
+ if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK))
+ return 0;
+
+ if (old->mnt_cifs_serverino_autodisabled)
+ newflags &= ~CIFS_MOUNT_SERVER_INUM;
+
+ if (oldflags != newflags)
+ return 0;
+
+ /*
+ * We want to share sb only if we don't specify an r/wsize or
+ * specified r/wsize is greater than or equal to existing one.
+ */
+ if (new->wsize && new->wsize < old->wsize)
+ return 0;
+
+ if (new->rsize && new->rsize < old->rsize)
+ return 0;
+
+ if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid))
+ return 0;
+
+ if (old->mnt_file_mode != new->mnt_file_mode ||
+ old->mnt_dir_mode != new->mnt_dir_mode)
+ return 0;
+
+ if (strcmp(old->local_nls->charset, new->local_nls->charset))
+ return 0;
+
+ if (old->actimeo != new->actimeo)
+ return 0;
+
+ return 1;
+}
+
+static int
+match_prepath(struct super_block *sb, struct cifs_mnt_data *mnt_data)
+{
+ struct cifs_sb_info *old = CIFS_SB(sb);
+ struct cifs_sb_info *new = mnt_data->cifs_sb;
+ bool old_set = (old->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
+ old->prepath;
+ bool new_set = (new->mnt_cifs_flags & CIFS_MOUNT_USE_PREFIX_PATH) &&
+ new->prepath;
+
+ if (old_set && new_set && !strcmp(new->prepath, old->prepath))
+ return 1;
+ else if (!old_set && !new_set)
+ return 1;
+
+ return 0;
+}
+
+int
+cifs_match_super(struct super_block *sb, void *data)
+{
+ struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data;
+ struct smb_vol *volume_info;
+ struct cifs_sb_info *cifs_sb;
+ struct TCP_Server_Info *tcp_srv;
+ struct cifs_ses *ses;
+ struct cifs_tcon *tcon;
+ struct tcon_link *tlink;
+ int rc = 0;
+
+ spin_lock(&cifs_tcp_ses_lock);
+ cifs_sb = CIFS_SB(sb);
+ tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
+ if (tlink == NULL) {
+ /* can not match superblock if tlink were ever null */
+ spin_unlock(&cifs_tcp_ses_lock);
+ return 0;
+ }
+ tcon = tlink_tcon(tlink);
+ ses = tcon->ses;
+ tcp_srv = ses->server;
+
+ volume_info = mnt_data->vol;
+
+ if (!match_server(tcp_srv, volume_info) ||
+ !match_session(ses, volume_info) ||
+ !match_tcon(tcon, volume_info) ||
+ !match_prepath(sb, mnt_data)) {
+ rc = 0;
+ goto out;
+ }
+
+ rc = compare_mount_options(sb, mnt_data);
+out:
+ spin_unlock(&cifs_tcp_ses_lock);
+ cifs_put_tlink(tlink);
+ return rc;
+}
+
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key cifs_key[2];
+static struct lock_class_key cifs_slock_key[2];
+
+static inline void
+cifs_reclassify_socket4(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ BUG_ON(!sock_allow_reclassification(sk));
+ sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS",
+ &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]);
+}
+
+static inline void
+cifs_reclassify_socket6(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ BUG_ON(!sock_allow_reclassification(sk));
+ sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS",
+ &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]);
+}
+#else
+static inline void
+cifs_reclassify_socket4(struct socket *sock)
+{
+}
+
+static inline void
+cifs_reclassify_socket6(struct socket *sock)
+{
+}
+#endif
+
+/* See RFC1001 section 14 on representation of Netbios names */
+static void rfc1002mangle(char *target, char *source, unsigned int length)
+{
+ unsigned int i, j;
+
+ for (i = 0, j = 0; i < (length); i++) {
+ /* mask a nibble at a time and encode */
+ target[j] = 'A' + (0x0F & (source[i] >> 4));
+ target[j+1] = 'A' + (0x0F & source[i]);
+ j += 2;
+ }
+
+}
+
+static int
+bind_socket(struct TCP_Server_Info *server)
+{
+ int rc = 0;
+ if (server->srcaddr.ss_family != AF_UNSPEC) {
+ /* Bind to the specified local IP address */
+ struct socket *socket = server->ssocket;
+ rc = socket->ops->bind(socket,
+ (struct sockaddr *) &server->srcaddr,
+ sizeof(server->srcaddr));
+ if (rc < 0) {
+ struct sockaddr_in *saddr4;
+ struct sockaddr_in6 *saddr6;
+ saddr4 = (struct sockaddr_in *)&server->srcaddr;
+ saddr6 = (struct sockaddr_in6 *)&server->srcaddr;
+ if (saddr6->sin6_family == AF_INET6)
+ cifs_server_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n",
+ &saddr6->sin6_addr, rc);
+ else
+ cifs_server_dbg(VFS, "Failed to bind to: %pI4, error: %d\n",
+ &saddr4->sin_addr.s_addr, rc);
+ }
+ }
+ return rc;
+}
+
+static int
+ip_rfc1001_connect(struct TCP_Server_Info *server)
+{
+ int rc = 0;
+ /*
+ * some servers require RFC1001 sessinit before sending
+ * negprot - BB check reconnection in case where second
+ * sessinit is sent but no second negprot
+ */
+ struct rfc1002_session_packet *ses_init_buf;
+ struct smb_hdr *smb_buf;
+ ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet),
+ GFP_KERNEL);
+ if (ses_init_buf) {
+ ses_init_buf->trailer.session_req.called_len = 32;
+
+ if (server->server_RFC1001_name[0] != 0)
+ rfc1002mangle(ses_init_buf->trailer.
+ session_req.called_name,
+ server->server_RFC1001_name,
+ RFC1001_NAME_LEN_WITH_NULL);
+ else
+ rfc1002mangle(ses_init_buf->trailer.
+ session_req.called_name,
+ DEFAULT_CIFS_CALLED_NAME,
+ RFC1001_NAME_LEN_WITH_NULL);
+
+ ses_init_buf->trailer.session_req.calling_len = 32;
+
+ /*
+ * calling name ends in null (byte 16) from old smb
+ * convention.
+ */
+ if (server->workstation_RFC1001_name[0] != 0)
+ rfc1002mangle(ses_init_buf->trailer.
+ session_req.calling_name,
+ server->workstation_RFC1001_name,
+ RFC1001_NAME_LEN_WITH_NULL);
+ else
+ rfc1002mangle(ses_init_buf->trailer.
+ session_req.calling_name,
+ "LINUX_CIFS_CLNT",
+ RFC1001_NAME_LEN_WITH_NULL);
+
+ ses_init_buf->trailer.session_req.scope1 = 0;
+ ses_init_buf->trailer.session_req.scope2 = 0;
+ smb_buf = (struct smb_hdr *)ses_init_buf;
+
+ /* sizeof RFC1002_SESSION_REQUEST with no scope */
+ smb_buf->smb_buf_length = cpu_to_be32(0x81000044);
+ rc = smb_send(server, smb_buf, 0x44);
+ kfree(ses_init_buf);
+ /*
+ * RFC1001 layer in at least one server
+ * requires very short break before negprot
+ * presumably because not expecting negprot
+ * to follow so fast. This is a simple
+ * solution that works without
+ * complicating the code and causes no
+ * significant slowing down on mount
+ * for everyone else
+ */
+ usleep_range(1000, 2000);
+ }
+ /*
+ * else the negprot may still work without this
+ * even though malloc failed
+ */
+
+ return rc;
+}
+
+static int
+generic_ip_connect(struct TCP_Server_Info *server)
+{
+ int rc = 0;
+ __be16 sport;
+ int slen, sfamily;
+ struct socket *socket = server->ssocket;
+ struct sockaddr *saddr;
+
+ saddr = (struct sockaddr *) &server->dstaddr;
+
+ if (server->dstaddr.ss_family == AF_INET6) {
+ sport = ((struct sockaddr_in6 *) saddr)->sin6_port;
+ slen = sizeof(struct sockaddr_in6);
+ sfamily = AF_INET6;
+ } else {
+ sport = ((struct sockaddr_in *) saddr)->sin_port;
+ slen = sizeof(struct sockaddr_in);
+ sfamily = AF_INET;
+ }
+
+ if (socket == NULL) {
+ rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM,
+ IPPROTO_TCP, &socket, 1);
+ if (rc < 0) {
+ cifs_server_dbg(VFS, "Error %d creating socket\n", rc);
+ server->ssocket = NULL;
+ return rc;
+ }
+
+ /* BB other socket options to set KEEPALIVE, NODELAY? */
+ cifs_dbg(FYI, "Socket created\n");
+ server->ssocket = socket;
+ socket->sk->sk_allocation = GFP_NOFS;
+ if (sfamily == AF_INET6)
+ cifs_reclassify_socket6(socket);
+ else
+ cifs_reclassify_socket4(socket);
+ }
+
+ rc = bind_socket(server);
+ if (rc < 0)
+ return rc;
+
+ /*
+ * Eventually check for other socket options to change from
+ * the default. sock_setsockopt not used because it expects
+ * user space buffer
+ */
+ socket->sk->sk_rcvtimeo = 7 * HZ;
+ socket->sk->sk_sndtimeo = 5 * HZ;
+
+ /* make the bufsizes depend on wsize/rsize and max requests */
+ if (server->noautotune) {
+ if (socket->sk->sk_sndbuf < (200 * 1024))
+ socket->sk->sk_sndbuf = 200 * 1024;
+ if (socket->sk->sk_rcvbuf < (140 * 1024))
+ socket->sk->sk_rcvbuf = 140 * 1024;
+ }
+
+ if (server->tcp_nodelay) {
+ int val = 1;
+ rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY,
+ (char *)&val, sizeof(val));
+ if (rc)
+ cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n",
+ rc);
+ }
+
+ cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n",
+ socket->sk->sk_sndbuf,
+ socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo);
+
+ rc = socket->ops->connect(socket, saddr, slen,
+ server->noblockcnt ? O_NONBLOCK : 0);
+ /*
+ * When mounting SMB root file systems, we do not want to block in
+ * connect. Otherwise bail out and then let cifs_reconnect() perform
+ * reconnect failover - if possible.
+ */
+ if (server->noblockcnt && rc == -EINPROGRESS)
+ rc = 0;
+ if (rc < 0) {
+ cifs_dbg(FYI, "Error %d connecting to server\n", rc);
+ sock_release(socket);
+ server->ssocket = NULL;
+ return rc;
+ }
+
+ if (sport == htons(RFC1001_PORT))
+ rc = ip_rfc1001_connect(server);
+
+ return rc;
+}
+
+static int
+ip_connect(struct TCP_Server_Info *server)
+{
+ __be16 *sport;
+ struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
+ struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
+
+ if (server->dstaddr.ss_family == AF_INET6)
+ sport = &addr6->sin6_port;
+ else
+ sport = &addr->sin_port;
+
+ if (*sport == 0) {
+ int rc;
+
+ /* try with 445 port at first */
+ *sport = htons(CIFS_PORT);
+
+ rc = generic_ip_connect(server);
+ if (rc >= 0)
+ return rc;
+
+ /* if it failed, try with 139 port */
+ *sport = htons(RFC1001_PORT);
+ }
+
+ return generic_ip_connect(server);
+}
+
+void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info)
+{
+ /* if we are reconnecting then should we check to see if
+ * any requested capabilities changed locally e.g. via
+ * remount but we can not do much about it here
+ * if they have (even if we could detect it by the following)
+ * Perhaps we could add a backpointer to array of sb from tcon
+ * or if we change to make all sb to same share the same
+ * sb as NFS - then we only have one backpointer to sb.
+ * What if we wanted to mount the server share twice once with
+ * and once without posixacls or posix paths? */
+ __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
+
+ if (vol_info && vol_info->no_linux_ext) {
+ tcon->fsUnixInfo.Capability = 0;
+ tcon->unix_ext = 0; /* Unix Extensions disabled */
+ cifs_dbg(FYI, "Linux protocol extensions disabled\n");
+ return;
+ } else if (vol_info)
+ tcon->unix_ext = 1; /* Unix Extensions supported */
+
+ if (tcon->unix_ext == 0) {
+ cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n");
+ return;
+ }
+
+ if (!CIFSSMBQFSUnixInfo(xid, tcon)) {
+ __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability);
+ cifs_dbg(FYI, "unix caps which server supports %lld\n", cap);
+ /* check for reconnect case in which we do not
+ want to change the mount behavior if we can avoid it */
+ if (vol_info == NULL) {
+ /* turn off POSIX ACL and PATHNAMES if not set
+ originally at mount time */
+ if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0)
+ cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
+ if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
+ if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
+ cifs_dbg(VFS, "POSIXPATH support change\n");
+ cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
+ } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) {
+ cifs_dbg(VFS, "possible reconnect error\n");
+ cifs_dbg(VFS, "server disabled POSIX path support\n");
+ }
+ }
+
+ if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
+ cifs_dbg(VFS, "per-share encryption not supported yet\n");
+
+ cap &= CIFS_UNIX_CAP_MASK;
+ if (vol_info && vol_info->no_psx_acl)
+ cap &= ~CIFS_UNIX_POSIX_ACL_CAP;
+ else if (CIFS_UNIX_POSIX_ACL_CAP & cap) {
+ cifs_dbg(FYI, "negotiated posix acl support\n");
+ if (cifs_sb)
+ cifs_sb->mnt_cifs_flags |=
+ CIFS_MOUNT_POSIXACL;
+ }
+
+ if (vol_info && vol_info->posix_paths == 0)
+ cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP;
+ else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) {
+ cifs_dbg(FYI, "negotiate posix pathnames\n");
+ if (cifs_sb)
+ cifs_sb->mnt_cifs_flags |=
+ CIFS_MOUNT_POSIX_PATHS;
+ }
+
+ cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap);
+#ifdef CONFIG_CIFS_DEBUG2
+ if (cap & CIFS_UNIX_FCNTL_CAP)
+ cifs_dbg(FYI, "FCNTL cap\n");
+ if (cap & CIFS_UNIX_EXTATTR_CAP)
+ cifs_dbg(FYI, "EXTATTR cap\n");
+ if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP)
+ cifs_dbg(FYI, "POSIX path cap\n");
+ if (cap & CIFS_UNIX_XATTR_CAP)
+ cifs_dbg(FYI, "XATTR cap\n");
+ if (cap & CIFS_UNIX_POSIX_ACL_CAP)
+ cifs_dbg(FYI, "POSIX ACL cap\n");
+ if (cap & CIFS_UNIX_LARGE_READ_CAP)
+ cifs_dbg(FYI, "very large read cap\n");
+ if (cap & CIFS_UNIX_LARGE_WRITE_CAP)
+ cifs_dbg(FYI, "very large write cap\n");
+ if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP)
+ cifs_dbg(FYI, "transport encryption cap\n");
+ if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)
+ cifs_dbg(FYI, "mandatory transport encryption cap\n");
+#endif /* CIFS_DEBUG2 */
+ if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) {
+ if (vol_info == NULL) {
+ cifs_dbg(FYI, "resetting capabilities failed\n");
+ } else
+ cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n");
+
+ }
+ }
+}
+
+int cifs_setup_cifs_sb(struct smb_vol *pvolume_info,
+ struct cifs_sb_info *cifs_sb)
+{
+ INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks);
+
+ spin_lock_init(&cifs_sb->tlink_tree_lock);
+ cifs_sb->tlink_tree = RB_ROOT;
+
+ cifs_sb->bsize = pvolume_info->bsize;
+ /*
+ * Temporarily set r/wsize for matching superblock. If we end up using
+ * new sb then client will later negotiate it downward if needed.
+ */
+ cifs_sb->rsize = pvolume_info->rsize;
+ cifs_sb->wsize = pvolume_info->wsize;
+
+ cifs_sb->mnt_uid = pvolume_info->linux_uid;
+ cifs_sb->mnt_gid = pvolume_info->linux_gid;
+ cifs_sb->mnt_file_mode = pvolume_info->file_mode;
+ cifs_sb->mnt_dir_mode = pvolume_info->dir_mode;
+ cifs_dbg(FYI, "file mode: %04ho dir mode: %04ho\n",
+ cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode);
+
+ cifs_sb->actimeo = pvolume_info->actimeo;
+ cifs_sb->local_nls = pvolume_info->local_nls;
+
+ if (pvolume_info->nodfs)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_DFS;
+ if (pvolume_info->noperm)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM;
+ if (pvolume_info->setuids)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID;
+ if (pvolume_info->setuidfromacl)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UID_FROM_ACL;
+ if (pvolume_info->server_ino)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM;
+ if (pvolume_info->remap)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SFM_CHR;
+ if (pvolume_info->sfu_remap)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR;
+ if (pvolume_info->no_xattr)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR;
+ if (pvolume_info->sfu_emul)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL;
+ if (pvolume_info->nobrl)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL;
+ if (pvolume_info->nohandlecache)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_HANDLE_CACHE;
+ if (pvolume_info->nostrictsync)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC;
+ if (pvolume_info->mand_lock)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL;
+ if (pvolume_info->rwpidforward)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD;
+ if (pvolume_info->mode_ace)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MODE_FROM_SID;
+ if (pvolume_info->cifs_acl)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL;
+ if (pvolume_info->backupuid_specified) {
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID;
+ cifs_sb->mnt_backupuid = pvolume_info->backupuid;
+ }
+ if (pvolume_info->backupgid_specified) {
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID;
+ cifs_sb->mnt_backupgid = pvolume_info->backupgid;
+ }
+ if (pvolume_info->override_uid)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID;
+ if (pvolume_info->override_gid)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID;
+ if (pvolume_info->dynperm)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM;
+ if (pvolume_info->fsc)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE;
+ if (pvolume_info->multiuser)
+ cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER |
+ CIFS_MOUNT_NO_PERM);
+ if (pvolume_info->strict_io)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO;
+ if (pvolume_info->direct_io) {
+ cifs_dbg(FYI, "mounting share using direct i/o\n");
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO;
+ }
+ if (pvolume_info->cache_ro) {
+ cifs_dbg(VFS, "mounting share with read only caching. Ensure that the share will not be modified while in use.\n");
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RO_CACHE;
+ } else if (pvolume_info->cache_rw) {
+ cifs_dbg(VFS, "mounting share in single client RW caching mode. Ensure that no other systems will be accessing the share.\n");
+ cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_RO_CACHE |
+ CIFS_MOUNT_RW_CACHE);
+ }
+ if (pvolume_info->mfsymlinks) {
+ if (pvolume_info->sfu_emul) {
+ /*
+ * Our SFU ("Services for Unix" emulation does not allow
+ * creating symlinks but does allow reading existing SFU
+ * symlinks (it does allow both creating and reading SFU
+ * style mknod and FIFOs though). When "mfsymlinks" and
+ * "sfu" are both enabled at the same time, it allows
+ * reading both types of symlinks, but will only create
+ * them with mfsymlinks format. This allows better
+ * Apple compatibility (probably better for Samba too)
+ * while still recognizing old Windows style symlinks.
+ */
+ cifs_dbg(VFS, "mount options mfsymlinks and sfu both enabled\n");
+ }
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS;
+ }
+
+ if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm))
+ cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n");
+
+ if (pvolume_info->prepath) {
+ cifs_sb->prepath = kstrdup(pvolume_info->prepath, GFP_KERNEL);
+ if (cifs_sb->prepath == NULL)
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void
+cifs_cleanup_volume_info_contents(struct smb_vol *volume_info)
+{
+ kfree(volume_info->username);
+ kzfree(volume_info->password);
+ kfree(volume_info->UNC);
+ kfree(volume_info->domainname);
+ kfree(volume_info->iocharset);
+ kfree(volume_info->prepath);
+}
+
+void
+cifs_cleanup_volume_info(struct smb_vol *volume_info)
+{
+ if (!volume_info)
+ return;
+ cifs_cleanup_volume_info_contents(volume_info);
+ kfree(volume_info);
+}
+
+/* Release all succeed connections */
+static inline void mount_put_conns(struct cifs_sb_info *cifs_sb,
+ unsigned int xid,
+ struct TCP_Server_Info *server,
+ struct cifs_ses *ses, struct cifs_tcon *tcon)
+{
+ int rc = 0;
+
+ if (tcon)
+ cifs_put_tcon(tcon);
+ else if (ses)
+ cifs_put_smb_ses(ses);
+ else if (server)
+ cifs_put_tcp_session(server, 0);
+ cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
+ free_xid(xid);
+}
+
+/* Get connections for tcp, ses and tcon */
+static int mount_get_conns(struct smb_vol *vol, struct cifs_sb_info *cifs_sb,
+ unsigned int *xid,
+ struct TCP_Server_Info **nserver,
+ struct cifs_ses **nses, struct cifs_tcon **ntcon)
+{
+ int rc = 0;
+ struct TCP_Server_Info *server;
+ struct cifs_ses *ses;
+ struct cifs_tcon *tcon;
+
+ *nserver = NULL;
+ *nses = NULL;
+ *ntcon = NULL;
+
+ *xid = get_xid();
+
+ /* get a reference to a tcp session */
+ server = cifs_get_tcp_session(vol);
+ if (IS_ERR(server)) {
+ rc = PTR_ERR(server);
+ return rc;
+ }
+
+ *nserver = server;
+
+ if ((vol->max_credits < 20) || (vol->max_credits > 60000))
+ server->max_credits = SMB2_MAX_CREDITS_AVAILABLE;
+ else
+ server->max_credits = vol->max_credits;
+
+ /* get a reference to a SMB session */
+ ses = cifs_get_smb_ses(server, vol);
+ if (IS_ERR(ses)) {
+ rc = PTR_ERR(ses);
+ return rc;
+ }
+
+ *nses = ses;
+
+ if ((vol->persistent == true) && (!(ses->server->capabilities &
+ SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
+ cifs_server_dbg(VFS, "persistent handles not supported by server\n");
+ return -EOPNOTSUPP;
+ }
+
+ /* search for existing tcon to this server share */
+ tcon = cifs_get_tcon(ses, vol);
+ if (IS_ERR(tcon)) {
+ rc = PTR_ERR(tcon);
+ return rc;
+ }
+
+ *ntcon = tcon;
+
+ /* if new SMB3.11 POSIX extensions are supported do not remap / and \ */
+ if (tcon->posix_extensions)
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_POSIX_PATHS;
+
+ /* tell server which Unix caps we support */
+ if (cap_unix(tcon->ses)) {
+ /*
+ * reset of caps checks mount to see if unix extensions disabled
+ * for just this mount.
+ */
+ reset_cifs_unix_caps(*xid, tcon, cifs_sb, vol);
+ if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
+ (le64_to_cpu(tcon->fsUnixInfo.Capability) &
+ CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP))
+ return -EACCES;
+ } else
+ tcon->unix_ext = 0; /* server does not support them */
+
+ /* do not care if a following call succeed - informational */
+ if (!tcon->pipe && server->ops->qfs_tcon) {
+ server->ops->qfs_tcon(*xid, tcon, cifs_sb);
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_RO_CACHE) {
+ if (tcon->fsDevInfo.DeviceCharacteristics &
+ cpu_to_le32(FILE_READ_ONLY_DEVICE))
+ cifs_dbg(VFS, "mounted to read only share\n");
+ else if ((cifs_sb->mnt_cifs_flags &
+ CIFS_MOUNT_RW_CACHE) == 0)
+ cifs_dbg(VFS, "read only mount of RW share\n");
+ /* no need to log a RW mount of a typical RW share */
+ }
+ }
+
+ cifs_sb->wsize = server->ops->negotiate_wsize(tcon, vol);
+ cifs_sb->rsize = server->ops->negotiate_rsize(tcon, vol);
+
+ return 0;
+}
+
+static int mount_setup_tlink(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
+ struct cifs_tcon *tcon)
+{
+ struct tcon_link *tlink;
+
+ /* hang the tcon off of the superblock */
+ tlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
+ if (tlink == NULL)
+ return -ENOMEM;
+
+ tlink->tl_uid = ses->linux_uid;
+ tlink->tl_tcon = tcon;
+ tlink->tl_time = jiffies;
+ set_bit(TCON_LINK_MASTER, &tlink->tl_flags);
+ set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
+
+ cifs_sb->master_tlink = tlink;
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+
+ queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
+ TLINK_IDLE_EXPIRE);
+ return 0;
+}
+
+#ifdef CONFIG_CIFS_DFS_UPCALL
+/*
+ * cifs_build_path_to_root returns full path to root when we do not have an
+ * exiting connection (tcon)
+ */
+static char *
+build_unc_path_to_root(const struct smb_vol *vol,
+ const struct cifs_sb_info *cifs_sb, bool useppath)
+{
+ char *full_path, *pos;
+ unsigned int pplen = useppath && vol->prepath ?
+ strlen(vol->prepath) + 1 : 0;
+ unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1);
+
+ if (unc_len > MAX_TREE_SIZE)
+ return ERR_PTR(-EINVAL);
+
+ full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL);
+ if (full_path == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ memcpy(full_path, vol->UNC, unc_len);
+ pos = full_path + unc_len;
+
+ if (pplen) {
+ *pos = CIFS_DIR_SEP(cifs_sb);
+ memcpy(pos + 1, vol->prepath, pplen);
+ pos += pplen;
+ }
+
+ *pos = '\0'; /* add trailing null */
+ convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb));
+ cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path);
+ return full_path;
+}
+
+/**
+ * expand_dfs_referral - Perform a dfs referral query and update the cifs_sb
+ *
+ *
+ * If a referral is found, cifs_sb->mountdata will be (re-)allocated
+ * to a string containing updated options for the submount. Otherwise it
+ * will be left untouched.
+ *
+ * Returns the rc from get_dfs_path to the caller, which can be used to
+ * determine whether there were referrals.
+ */
+static int
+expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses,
+ struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb,
+ int check_prefix)
+{
+ int rc;
+ struct dfs_info3_param referral = {0};
+ char *full_path = NULL, *ref_path = NULL, *mdata = NULL;
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
+ return -EREMOTE;
+
+ full_path = build_unc_path_to_root(volume_info, cifs_sb, true);
+ if (IS_ERR(full_path))
+ return PTR_ERR(full_path);
+
+ /* For DFS paths, skip the first '\' of the UNC */
+ ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1;
+
+ rc = dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
+ ref_path, &referral, NULL);
+ if (!rc) {
+ char *fake_devname = NULL;
+
+ mdata = cifs_compose_mount_options(cifs_sb->mountdata,
+ full_path + 1, &referral,
+ &fake_devname);
+ free_dfs_info_param(&referral);
+
+ if (IS_ERR(mdata)) {
+ rc = PTR_ERR(mdata);
+ mdata = NULL;
+ } else {
+ cifs_cleanup_volume_info_contents(volume_info);
+ rc = cifs_setup_volume_info(volume_info, mdata,
+ fake_devname, false);
+ }
+ kfree(fake_devname);
+ kfree(cifs_sb->mountdata);
+ cifs_sb->mountdata = mdata;
+ }
+ kfree(full_path);
+ return rc;
+}
+
+static inline int get_next_dfs_tgt(const char *path,
+ struct dfs_cache_tgt_list *tgt_list,
+ struct dfs_cache_tgt_iterator **tgt_it)
+{
+ if (!*tgt_it)
+ *tgt_it = dfs_cache_get_tgt_iterator(tgt_list);
+ else
+ *tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it);
+ return !*tgt_it ? -EHOSTDOWN : 0;
+}
+
+static int update_vol_info(const struct dfs_cache_tgt_iterator *tgt_it,
+ struct smb_vol *fake_vol, struct smb_vol *vol)
+{
+ const char *tgt = dfs_cache_get_tgt_name(tgt_it);
+ int len = strlen(tgt) + 2;
+ char *new_unc;
+
+ new_unc = kmalloc(len, GFP_KERNEL);
+ if (!new_unc)
+ return -ENOMEM;
+ scnprintf(new_unc, len, "\\%s", tgt);
+
+ kfree(vol->UNC);
+ vol->UNC = new_unc;
+
+ if (fake_vol->prepath) {
+ kfree(vol->prepath);
+ vol->prepath = fake_vol->prepath;
+ fake_vol->prepath = NULL;
+ }
+ memcpy(&vol->dstaddr, &fake_vol->dstaddr, sizeof(vol->dstaddr));
+
+ return 0;
+}
+
+static int setup_dfs_tgt_conn(const char *path,
+ const struct dfs_cache_tgt_iterator *tgt_it,
+ struct cifs_sb_info *cifs_sb,
+ struct smb_vol *vol,
+ unsigned int *xid,
+ struct TCP_Server_Info **server,
+ struct cifs_ses **ses,
+ struct cifs_tcon **tcon)
+{
+ int rc;
+ struct dfs_info3_param ref = {0};
+ char *mdata = NULL, *fake_devname = NULL;
+ struct smb_vol fake_vol = {NULL};
+
+ cifs_dbg(FYI, "%s: dfs path: %s\n", __func__, path);
+
+ rc = dfs_cache_get_tgt_referral(path, tgt_it, &ref);
+ if (rc)
+ return rc;
+
+ mdata = cifs_compose_mount_options(cifs_sb->mountdata, path, &ref,
+ &fake_devname);
+ free_dfs_info_param(&ref);
+
+ if (IS_ERR(mdata)) {
+ rc = PTR_ERR(mdata);
+ mdata = NULL;
+ } else {
+ cifs_dbg(FYI, "%s: fake_devname: %s\n", __func__, fake_devname);
+ rc = cifs_setup_volume_info(&fake_vol, mdata, fake_devname,
+ false);
+ }
+ kfree(mdata);
+ kfree(fake_devname);
+
+ if (!rc) {
+ /*
+ * We use a 'fake_vol' here because we need pass it down to the
+ * mount_{get,put} functions to test connection against new DFS
+ * targets.
+ */
+ mount_put_conns(cifs_sb, *xid, *server, *ses, *tcon);
+ rc = mount_get_conns(&fake_vol, cifs_sb, xid, server, ses,
+ tcon);
+ if (!rc) {
+ /*
+ * We were able to connect to new target server.
+ * Update current volume info with new target server.
+ */
+ rc = update_vol_info(tgt_it, &fake_vol, vol);
+ }
+ }
+ cifs_cleanup_volume_info_contents(&fake_vol);
+ return rc;
+}
+
+static int mount_do_dfs_failover(const char *path,
+ struct cifs_sb_info *cifs_sb,
+ struct smb_vol *vol,
+ struct cifs_ses *root_ses,
+ unsigned int *xid,
+ struct TCP_Server_Info **server,
+ struct cifs_ses **ses,
+ struct cifs_tcon **tcon)
+{
+ int rc;
+ struct dfs_cache_tgt_list tgt_list;
+ struct dfs_cache_tgt_iterator *tgt_it = NULL;
+
+ if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS)
+ return -EOPNOTSUPP;
+
+ rc = dfs_cache_noreq_find(path, NULL, &tgt_list);
+ if (rc)
+ return rc;
+
+ for (;;) {
+ /* Get next DFS target server - if any */
+ rc = get_next_dfs_tgt(path, &tgt_list, &tgt_it);
+ if (rc)
+ break;
+ /* Connect to next DFS target */
+ rc = setup_dfs_tgt_conn(path, tgt_it, cifs_sb, vol, xid, server,
+ ses, tcon);
+ if (!rc || rc == -EACCES || rc == -EOPNOTSUPP)
+ break;
+ }
+ if (!rc) {
+ /*
+ * Update DFS target hint in DFS referral cache with the target
+ * server we successfully reconnected to.
+ */
+ rc = dfs_cache_update_tgthint(*xid, root_ses ? root_ses : *ses,
+ cifs_sb->local_nls,
+ cifs_remap(cifs_sb), path,
+ tgt_it);
+ }
+ dfs_cache_free_tgts(&tgt_list);
+ return rc;
+}
+#endif
+
+int
+cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data,
+ const char *devname, bool is_smb3)
+{
+ int rc = 0;
+
+ if (cifs_parse_mount_options(mount_data, devname, volume_info, is_smb3))
+ return -EINVAL;
+
+ if (volume_info->nullauth) {
+ cifs_dbg(FYI, "Anonymous login\n");
+ kfree(volume_info->username);
+ volume_info->username = NULL;
+ } else if (volume_info->username) {
+ /* BB fixme parse for domain name here */
+ cifs_dbg(FYI, "Username: %s\n", volume_info->username);
+ } else {
+ cifs_dbg(VFS, "No username specified\n");
+ /* In userspace mount helper we can get user name from alternate
+ locations such as env variables and files on disk */
+ return -EINVAL;
+ }
+
+ /* this is needed for ASCII cp to Unicode converts */
+ if (volume_info->iocharset == NULL) {
+ /* load_nls_default cannot return null */
+ volume_info->local_nls = load_nls_default();
+ } else {
+ volume_info->local_nls = load_nls(volume_info->iocharset);
+ if (volume_info->local_nls == NULL) {
+ cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n",
+ volume_info->iocharset);
+ return -ELIBACC;
+ }
+ }
+
+ return rc;
+}
+
+struct smb_vol *
+cifs_get_volume_info(char *mount_data, const char *devname, bool is_smb3)
+{
+ int rc;
+ struct smb_vol *volume_info;
+
+ volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL);
+ if (!volume_info)
+ return ERR_PTR(-ENOMEM);
+
+ rc = cifs_setup_volume_info(volume_info, mount_data, devname, is_smb3);
+ if (rc) {
+ cifs_cleanup_volume_info(volume_info);
+ volume_info = ERR_PTR(rc);
+ }
+
+ return volume_info;
+}
+
+static int
+cifs_are_all_path_components_accessible(struct TCP_Server_Info *server,
+ unsigned int xid,
+ struct cifs_tcon *tcon,
+ struct cifs_sb_info *cifs_sb,
+ char *full_path,
+ int added_treename)
+{
+ int rc;
+ char *s;
+ char sep, tmp;
+ int skip = added_treename ? 1 : 0;
+
+ sep = CIFS_DIR_SEP(cifs_sb);
+ s = full_path;
+
+ rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, "");
+ while (rc == 0) {
+ /* skip separators */
+ while (*s == sep)
+ s++;
+ if (!*s)
+ break;
+ /* next separator */
+ while (*s && *s != sep)
+ s++;
+ /*
+ * if the treename is added, we then have to skip the first
+ * part within the separators
+ */
+ if (skip) {
+ skip = 0;
+ continue;
+ }
+ /*
+ * temporarily null-terminate the path at the end of
+ * the current component
+ */
+ tmp = *s;
+ *s = 0;
+ rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
+ full_path);
+ *s = tmp;
+ }
+ return rc;
+}
+
+/*
+ * Check if path is remote (e.g. a DFS share). Return -EREMOTE if it is,
+ * otherwise 0.
+ */
+static int is_path_remote(struct cifs_sb_info *cifs_sb, struct smb_vol *vol,
+ const unsigned int xid,
+ struct TCP_Server_Info *server,
+ struct cifs_tcon *tcon)
+{
+ int rc;
+ char *full_path;
+
+ if (!server->ops->is_path_accessible)
+ return -EOPNOTSUPP;
+
+ /*
+ * cifs_build_path_to_root works only when we have a valid tcon
+ */
+ full_path = cifs_build_path_to_root(vol, cifs_sb, tcon,
+ tcon->Flags & SMB_SHARE_IS_IN_DFS);
+ if (full_path == NULL)
+ return -ENOMEM;
+
+ cifs_dbg(FYI, "%s: full_path: %s\n", __func__, full_path);
+
+ rc = server->ops->is_path_accessible(xid, tcon, cifs_sb,
+ full_path);
+ if (rc != 0 && rc != -EREMOTE) {
+ kfree(full_path);
+ return rc;
+ }
+
+ if (rc != -EREMOTE) {
+ rc = cifs_are_all_path_components_accessible(server, xid, tcon,
+ cifs_sb, full_path, tcon->Flags & SMB_SHARE_IS_IN_DFS);
+ if (rc != 0) {
+ cifs_server_dbg(VFS, "cannot query dirs between root and final path, "
+ "enabling CIFS_MOUNT_USE_PREFIX_PATH\n");
+ cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH;
+ rc = 0;
+ }
+ }
+
+ kfree(full_path);
+ return rc;
+}
+
+#ifdef CONFIG_CIFS_DFS_UPCALL
+static inline void set_root_tcon(struct cifs_sb_info *cifs_sb,
+ struct cifs_tcon *tcon,
+ struct cifs_tcon **root)
+{
+ spin_lock(&cifs_tcp_ses_lock);
+ tcon->tc_count++;
+ tcon->remap = cifs_remap(cifs_sb);
+ spin_unlock(&cifs_tcp_ses_lock);
+ *root = tcon;
+}
+
+int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
+{
+ int rc = 0;
+ unsigned int xid;
+ struct cifs_ses *ses;
+ struct cifs_tcon *root_tcon = NULL;
+ struct cifs_tcon *tcon = NULL;
+ struct TCP_Server_Info *server;
+ char *root_path = NULL, *full_path = NULL;
+ char *old_mountdata, *origin_mountdata = NULL;
+ int count;
+
+ rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
+ if (!rc && tcon) {
+ /* If not a standalone DFS root, then check if path is remote */
+ rc = dfs_cache_find(xid, ses, cifs_sb->local_nls,
+ cifs_remap(cifs_sb), vol->UNC + 1, NULL,
+ NULL);
+ if (rc) {
+ rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
+ if (!rc)
+ goto out;
+ if (rc != -EREMOTE)
+ goto error;
+ }
+ }
+ /*
+ * If first DFS target server went offline and we failed to connect it,
+ * server and ses pointers are NULL at this point, though we still have
+ * chance to get a cached DFS referral in expand_dfs_referral() and
+ * retry next target available in it.
+ *
+ * If a NULL ses ptr is passed to dfs_cache_find(), a lookup will be
+ * performed against DFS path and *no* requests will be sent to server
+ * for any new DFS referrals. Hence it's safe to skip checking whether
+ * server or ses ptr is NULL.
+ */
+ if (rc == -EACCES || rc == -EOPNOTSUPP)
+ goto error;
+
+ root_path = build_unc_path_to_root(vol, cifs_sb, false);
+ if (IS_ERR(root_path)) {
+ rc = PTR_ERR(root_path);
+ root_path = NULL;
+ goto error;
+ }
+
+ full_path = build_unc_path_to_root(vol, cifs_sb, true);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
+ full_path = NULL;
+ goto error;
+ }
+ /*
+ * Perform an unconditional check for whether there are DFS
+ * referrals for this path without prefix, to provide support
+ * for DFS referrals from w2k8 servers which don't seem to respond
+ * with PATH_NOT_COVERED to requests that include the prefix.
+ * Chase the referral if found, otherwise continue normally.
+ */
+ old_mountdata = cifs_sb->mountdata;
+ (void)expand_dfs_referral(xid, ses, vol, cifs_sb, false);
+
+ if (cifs_sb->mountdata == NULL) {
+ rc = -ENOENT;
+ goto error;
+ }
+
+ /* Save DFS root volume information for DFS refresh worker */
+ origin_mountdata = kstrndup(cifs_sb->mountdata,
+ strlen(cifs_sb->mountdata), GFP_KERNEL);
+ if (!origin_mountdata) {
+ rc = -ENOMEM;
+ goto error;
+ }
+
+ if (cifs_sb->mountdata != old_mountdata) {
+ /* If we were redirected, reconnect to new target server */
+ mount_put_conns(cifs_sb, xid, server, ses, tcon);
+ rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
+ }
+ if (rc) {
+ if (rc == -EACCES || rc == -EOPNOTSUPP)
+ goto error;
+ /* Perform DFS failover to any other DFS targets */
+ rc = mount_do_dfs_failover(root_path + 1, cifs_sb, vol, NULL,
+ &xid, &server, &ses, &tcon);
+ if (rc)
+ goto error;
+ }
+
+ kfree(root_path);
+ root_path = build_unc_path_to_root(vol, cifs_sb, false);
+ if (IS_ERR(root_path)) {
+ rc = PTR_ERR(root_path);
+ root_path = NULL;
+ goto error;
+ }
+ /* Cache out resolved root server */
+ (void)dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb),
+ root_path + 1, NULL, NULL);
+ kfree(root_path);
+ root_path = NULL;
+
+ set_root_tcon(cifs_sb, tcon, &root_tcon);
+
+ for (count = 1; ;) {
+ if (!rc && tcon) {
+ rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
+ if (!rc || rc != -EREMOTE)
+ break;
+ }
+ /*
+ * BB: when we implement proper loop detection,
+ * we will remove this check. But now we need it
+ * to prevent an indefinite loop if 'DFS tree' is
+ * misconfigured (i.e. has loops).
+ */
+ if (count++ > MAX_NESTED_LINKS) {
+ rc = -ELOOP;
+ break;
+ }
+
+ kfree(full_path);
+ full_path = build_unc_path_to_root(vol, cifs_sb, true);
+ if (IS_ERR(full_path)) {
+ rc = PTR_ERR(full_path);
+ full_path = NULL;
+ break;
+ }
+
+ old_mountdata = cifs_sb->mountdata;
+ rc = expand_dfs_referral(xid, root_tcon->ses, vol, cifs_sb,
+ true);
+ if (rc)
+ break;
+
+ if (cifs_sb->mountdata != old_mountdata) {
+ mount_put_conns(cifs_sb, xid, server, ses, tcon);
+ rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses,
+ &tcon);
+ /*
+ * Ensure that DFS referrals go through new root server.
+ */
+ if (!rc && tcon &&
+ (tcon->share_flags & (SHI1005_FLAGS_DFS |
+ SHI1005_FLAGS_DFS_ROOT))) {
+ cifs_put_tcon(root_tcon);
+ set_root_tcon(cifs_sb, tcon, &root_tcon);
+ }
+ }
+ if (rc) {
+ if (rc == -EACCES || rc == -EOPNOTSUPP)
+ break;
+ /* Perform DFS failover to any other DFS targets */
+ rc = mount_do_dfs_failover(full_path + 1, cifs_sb, vol,
+ root_tcon->ses, &xid,
+ &server, &ses, &tcon);
+ if (rc == -EACCES || rc == -EOPNOTSUPP || !server ||
+ !ses)
+ goto error;
+ }
+ }
+ cifs_put_tcon(root_tcon);
+
+ if (rc)
+ goto error;
+
+ spin_lock(&cifs_tcp_ses_lock);
+ if (!tcon->dfs_path) {
+ /* Save full path in new tcon to do failover when reconnecting tcons */
+ tcon->dfs_path = full_path;
+ full_path = NULL;
+ tcon->remap = cifs_remap(cifs_sb);
+ }
+ cifs_sb->origin_fullpath = kstrndup(tcon->dfs_path,
+ strlen(tcon->dfs_path),
+ GFP_ATOMIC);
+ if (!cifs_sb->origin_fullpath) {
+ spin_unlock(&cifs_tcp_ses_lock);
+ rc = -ENOMEM;
+ goto error;
+ }
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ rc = dfs_cache_add_vol(origin_mountdata, vol, cifs_sb->origin_fullpath);
+ if (rc) {
+ kfree(cifs_sb->origin_fullpath);
+ goto error;
+ }
+ /*
+ * After reconnecting to a different server, unique ids won't
+ * match anymore, so we disable serverino. This prevents
+ * dentry revalidation to think the dentry are stale (ESTALE).
+ */
+ cifs_autodisable_serverino(cifs_sb);
+out:
+ free_xid(xid);
+ return mount_setup_tlink(cifs_sb, ses, tcon);
+
+error:
+ kfree(full_path);
+ kfree(root_path);
+ kfree(origin_mountdata);
+ mount_put_conns(cifs_sb, xid, server, ses, tcon);
+ return rc;
+}
+#else
+int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *vol)
+{
+ int rc = 0;
+ unsigned int xid;
+ struct cifs_ses *ses;
+ struct cifs_tcon *tcon;
+ struct TCP_Server_Info *server;
+
+ rc = mount_get_conns(vol, cifs_sb, &xid, &server, &ses, &tcon);
+ if (rc)
+ goto error;
+
+ if (tcon) {
+ rc = is_path_remote(cifs_sb, vol, xid, server, tcon);
+ if (rc == -EREMOTE)
+ rc = -EOPNOTSUPP;
+ if (rc)
+ goto error;
+ }
+
+ free_xid(xid);
+
+ return mount_setup_tlink(cifs_sb, ses, tcon);
+
+error:
+ mount_put_conns(cifs_sb, xid, server, ses, tcon);
+ return rc;
+}
+#endif
+
+/*
+ * Issue a TREE_CONNECT request.
+ */
+int
+CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
+ const char *tree, struct cifs_tcon *tcon,
+ const struct nls_table *nls_codepage)
+{
+ struct smb_hdr *smb_buffer;
+ struct smb_hdr *smb_buffer_response;
+ TCONX_REQ *pSMB;
+ TCONX_RSP *pSMBr;
+ unsigned char *bcc_ptr;
+ int rc = 0;
+ int length;
+ __u16 bytes_left, count;
+
+ if (ses == NULL)
+ return -EIO;
+
+ smb_buffer = cifs_buf_get();
+ if (smb_buffer == NULL)
+ return -ENOMEM;
+
+ smb_buffer_response = smb_buffer;
+
+ header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX,
+ NULL /*no tid */ , 4 /*wct */ );
+
+ smb_buffer->Mid = get_next_mid(ses->server);
+ smb_buffer->Uid = ses->Suid;
+ pSMB = (TCONX_REQ *) smb_buffer;
+ pSMBr = (TCONX_RSP *) smb_buffer_response;
+
+ pSMB->AndXCommand = 0xFF;
+ pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO);
+ bcc_ptr = &pSMB->Password[0];
+ if (tcon->pipe || (ses->server->sec_mode & SECMODE_USER)) {
+ pSMB->PasswordLength = cpu_to_le16(1); /* minimum */
+ *bcc_ptr = 0; /* password is null byte */
+ bcc_ptr++; /* skip password */
+ /* already aligned so no need to do it below */
+ } else {
+ pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
+ /* BB FIXME add code to fail this if NTLMv2 or Kerberos
+ specified as required (when that support is added to
+ the vfs in the future) as only NTLM or the much
+ weaker LANMAN (which we do not send by default) is accepted
+ by Samba (not sure whether other servers allow
+ NTLMv2 password here) */
+#ifdef CONFIG_CIFS_WEAK_PW_HASH
+ if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
+ (ses->sectype == LANMAN))
+ calc_lanman_hash(tcon->password, ses->server->cryptkey,
+ ses->server->sec_mode &
+ SECMODE_PW_ENCRYPT ? true : false,
+ bcc_ptr);
+ else
+#endif /* CIFS_WEAK_PW_HASH */
+ rc = SMBNTencrypt(tcon->password, ses->server->cryptkey,
+ bcc_ptr, nls_codepage);
+ if (rc) {
+ cifs_dbg(FYI, "%s Can't generate NTLM rsp. Error: %d\n",
+ __func__, rc);
+ cifs_buf_release(smb_buffer);
+ return rc;
+ }
+
+ bcc_ptr += CIFS_AUTH_RESP_SIZE;
+ if (ses->capabilities & CAP_UNICODE) {
+ /* must align unicode strings */
+ *bcc_ptr = 0; /* null byte password */
+ bcc_ptr++;
+ }
+ }
+
+ if (ses->server->sign)
+ smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
+
+ if (ses->capabilities & CAP_STATUS32) {
+ smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS;
+ }
+ if (ses->capabilities & CAP_DFS) {
+ smb_buffer->Flags2 |= SMBFLG2_DFS;
+ }
+ if (ses->capabilities & CAP_UNICODE) {
+ smb_buffer->Flags2 |= SMBFLG2_UNICODE;
+ length =
+ cifs_strtoUTF16((__le16 *) bcc_ptr, tree,
+ 6 /* max utf8 char length in bytes */ *
+ (/* server len*/ + 256 /* share len */), nls_codepage);
+ bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */
+ bcc_ptr += 2; /* skip trailing null */
+ } else { /* ASCII */
+ strcpy(bcc_ptr, tree);
+ bcc_ptr += strlen(tree) + 1;
+ }
+ strcpy(bcc_ptr, "?????");
+ bcc_ptr += strlen("?????");
+ bcc_ptr += 1;
+ count = bcc_ptr - &pSMB->Password[0];
+ pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu(
+ pSMB->hdr.smb_buf_length) + count);
+ pSMB->ByteCount = cpu_to_le16(count);
+
+ rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length,
+ 0);
+
+ /* above now done in SendReceive */
+ if (rc == 0) {
+ bool is_unicode;
+
+ tcon->tidStatus = CifsGood;
+ tcon->need_reconnect = false;
+ tcon->tid = smb_buffer_response->Tid;
+ bcc_ptr = pByteArea(smb_buffer_response);
+ bytes_left = get_bcc(smb_buffer_response);
+ length = strnlen(bcc_ptr, bytes_left - 2);
+ if (smb_buffer->Flags2 & SMBFLG2_UNICODE)
+ is_unicode = true;
+ else
+ is_unicode = false;
+
+
+ /* skip service field (NB: this field is always ASCII) */
+ if (length == 3) {
+ if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') &&
+ (bcc_ptr[2] == 'C')) {
+ cifs_dbg(FYI, "IPC connection\n");
+ tcon->ipc = true;
+ tcon->pipe = true;
+ }
+ } else if (length == 2) {
+ if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) {
+ /* the most common case */
+ cifs_dbg(FYI, "disk share connection\n");
+ }
+ }
+ bcc_ptr += length + 1;
+ bytes_left -= (length + 1);
+ strlcpy(tcon->treeName, tree, sizeof(tcon->treeName));
+
+ /* mostly informational -- no need to fail on error here */
+ kfree(tcon->nativeFileSystem);
+ tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr,
+ bytes_left, is_unicode,
+ nls_codepage);
+
+ cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem);
+
+ if ((smb_buffer_response->WordCount == 3) ||
+ (smb_buffer_response->WordCount == 7))
+ /* field is in same location */
+ tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport);
+ else
+ tcon->Flags = 0;
+ cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags);
+ }
+
+ cifs_buf_release(smb_buffer);
+ return rc;
+}
+
+static void delayed_free(struct rcu_head *p)
+{
+ struct cifs_sb_info *sbi = container_of(p, struct cifs_sb_info, rcu);
+ unload_nls(sbi->local_nls);
+ kfree(sbi);
+}
+
+void
+cifs_umount(struct cifs_sb_info *cifs_sb)
+{
+ struct rb_root *root = &cifs_sb->tlink_tree;
+ struct rb_node *node;
+ struct tcon_link *tlink;
+
+ cancel_delayed_work_sync(&cifs_sb->prune_tlinks);
+
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ while ((node = rb_first(root))) {
+ tlink = rb_entry(node, struct tcon_link, tl_rbnode);
+ cifs_get_tlink(tlink);
+ clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
+ rb_erase(node, root);
+
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+ cifs_put_tlink(tlink);
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ }
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+
+ kfree(cifs_sb->mountdata);
+ kfree(cifs_sb->prepath);
+#ifdef CONFIG_CIFS_DFS_UPCALL
+ dfs_cache_del_vol(cifs_sb->origin_fullpath);
+ kfree(cifs_sb->origin_fullpath);
+#endif
+ call_rcu(&cifs_sb->rcu, delayed_free);
+}
+
+int
+cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses)
+{
+ int rc = 0;
+ struct TCP_Server_Info *server = ses->server;
+
+ if (!server->ops->need_neg || !server->ops->negotiate)
+ return -ENOSYS;
+
+ /* only send once per connect */
+ if (!server->ops->need_neg(server))
+ return 0;
+
+ rc = server->ops->negotiate(xid, ses);
+ if (rc == 0) {
+ spin_lock(&GlobalMid_Lock);
+ if (server->tcpStatus == CifsNeedNegotiate)
+ server->tcpStatus = CifsGood;
+ else
+ rc = -EHOSTDOWN;
+ spin_unlock(&GlobalMid_Lock);
+ }
+
+ return rc;
+}
+
+int
+cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
+ struct nls_table *nls_info)
+{
+ int rc = -ENOSYS;
+ struct TCP_Server_Info *server = ses->server;
+
+ ses->capabilities = server->capabilities;
+ if (linuxExtEnabled == 0)
+ ses->capabilities &= (~server->vals->cap_unix);
+
+ cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n",
+ server->sec_mode, server->capabilities, server->timeAdj);
+
+ if (ses->auth_key.response) {
+ cifs_dbg(FYI, "Free previous auth_key.response = %p\n",
+ ses->auth_key.response);
+ kfree(ses->auth_key.response);
+ ses->auth_key.response = NULL;
+ ses->auth_key.len = 0;
+ }
+
+ if (server->ops->sess_setup)
+ rc = server->ops->sess_setup(xid, ses, nls_info);
+
+ if (rc)
+ cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
+
+ return rc;
+}
+
+static int
+cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses)
+{
+ vol->sectype = ses->sectype;
+
+ /* krb5 is special, since we don't need username or pw */
+ if (vol->sectype == Kerberos)
+ return 0;
+
+ return cifs_set_cifscreds(vol, ses);
+}
+
+static struct cifs_tcon *
+cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid)
+{
+ int rc;
+ struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb);
+ struct cifs_ses *ses;
+ struct cifs_tcon *tcon = NULL;
+ struct smb_vol *vol_info;
+
+ vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL);
+ if (vol_info == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ vol_info->local_nls = cifs_sb->local_nls;
+ vol_info->linux_uid = fsuid;
+ vol_info->cred_uid = fsuid;
+ vol_info->UNC = master_tcon->treeName;
+ vol_info->retry = master_tcon->retry;
+ vol_info->nocase = master_tcon->nocase;
+ vol_info->nohandlecache = master_tcon->nohandlecache;
+ vol_info->local_lease = master_tcon->local_lease;
+ vol_info->no_lease = master_tcon->no_lease;
+ vol_info->resilient = master_tcon->use_resilient;
+ vol_info->persistent = master_tcon->use_persistent;
+ vol_info->handle_timeout = master_tcon->handle_timeout;
+ vol_info->no_linux_ext = !master_tcon->unix_ext;
+ vol_info->linux_ext = master_tcon->posix_extensions;
+ vol_info->sectype = master_tcon->ses->sectype;
+ vol_info->sign = master_tcon->ses->sign;
+ vol_info->seal = master_tcon->seal;
+
+ rc = cifs_set_vol_auth(vol_info, master_tcon->ses);
+ if (rc) {
+ tcon = ERR_PTR(rc);
+ goto out;
+ }
+
+ /* get a reference for the same TCP session */
+ spin_lock(&cifs_tcp_ses_lock);
+ ++master_tcon->ses->server->srv_count;
+ spin_unlock(&cifs_tcp_ses_lock);
+
+ ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info);
+ if (IS_ERR(ses)) {
+ tcon = (struct cifs_tcon *)ses;
+ cifs_put_tcp_session(master_tcon->ses->server, 0);
+ goto out;
+ }
+
+ tcon = cifs_get_tcon(ses, vol_info);
+ if (IS_ERR(tcon)) {
+ cifs_put_smb_ses(ses);
+ goto out;
+ }
+
+ if (cap_unix(ses))
+ reset_cifs_unix_caps(0, tcon, NULL, vol_info);
+
+out:
+ kfree(vol_info->username);
+ kzfree(vol_info->password);
+ kfree(vol_info);
+
+ return tcon;
+}
+
+struct cifs_tcon *
+cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb)
+{
+ return tlink_tcon(cifs_sb_master_tlink(cifs_sb));
+}
+
+/* find and return a tlink with given uid */
+static struct tcon_link *
+tlink_rb_search(struct rb_root *root, kuid_t uid)
+{
+ struct rb_node *node = root->rb_node;
+ struct tcon_link *tlink;
+
+ while (node) {
+ tlink = rb_entry(node, struct tcon_link, tl_rbnode);
+
+ if (uid_gt(tlink->tl_uid, uid))
+ node = node->rb_left;
+ else if (uid_lt(tlink->tl_uid, uid))
+ node = node->rb_right;
+ else
+ return tlink;
+ }
+ return NULL;
+}
+
+/* insert a tcon_link into the tree */
+static void
+tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink)
+{
+ struct rb_node **new = &(root->rb_node), *parent = NULL;
+ struct tcon_link *tlink;
+
+ while (*new) {
+ tlink = rb_entry(*new, struct tcon_link, tl_rbnode);
+ parent = *new;
+
+ if (uid_gt(tlink->tl_uid, new_tlink->tl_uid))
+ new = &((*new)->rb_left);
+ else
+ new = &((*new)->rb_right);
+ }
+
+ rb_link_node(&new_tlink->tl_rbnode, parent, new);
+ rb_insert_color(&new_tlink->tl_rbnode, root);
+}
+
+/*
+ * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the
+ * current task.
+ *
+ * If the superblock doesn't refer to a multiuser mount, then just return
+ * the master tcon for the mount.
+ *
+ * First, search the rbtree for an existing tcon for this fsuid. If one
+ * exists, then check to see if it's pending construction. If it is then wait
+ * for construction to complete. Once it's no longer pending, check to see if
+ * it failed and either return an error or retry construction, depending on
+ * the timeout.
+ *
+ * If one doesn't exist then insert a new tcon_link struct into the tree and
+ * try to construct a new one.
+ */
+struct tcon_link *
+cifs_sb_tlink(struct cifs_sb_info *cifs_sb)
+{
+ int ret;
+ kuid_t fsuid = current_fsuid();
+ struct tcon_link *tlink, *newtlink;
+
+ if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER))
+ return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
+
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
+ if (tlink)
+ cifs_get_tlink(tlink);
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+
+ if (tlink == NULL) {
+ newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL);
+ if (newtlink == NULL)
+ return ERR_PTR(-ENOMEM);
+ newtlink->tl_uid = fsuid;
+ newtlink->tl_tcon = ERR_PTR(-EACCES);
+ set_bit(TCON_LINK_PENDING, &newtlink->tl_flags);
+ set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags);
+ cifs_get_tlink(newtlink);
+
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ /* was one inserted after previous search? */
+ tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid);
+ if (tlink) {
+ cifs_get_tlink(tlink);
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+ kfree(newtlink);
+ goto wait_for_construction;
+ }
+ tlink = newtlink;
+ tlink_rb_insert(&cifs_sb->tlink_tree, tlink);
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+ } else {
+wait_for_construction:
+ ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING,
+ TASK_INTERRUPTIBLE);
+ if (ret) {
+ cifs_put_tlink(tlink);
+ return ERR_PTR(-ERESTARTSYS);
+ }
+
+ /* if it's good, return it */
+ if (!IS_ERR(tlink->tl_tcon))
+ return tlink;
+
+ /* return error if we tried this already recently */
+ if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) {
+ cifs_put_tlink(tlink);
+ return ERR_PTR(-EACCES);
+ }
+
+ if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags))
+ goto wait_for_construction;
+ }
+
+ tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid);
+ clear_bit(TCON_LINK_PENDING, &tlink->tl_flags);
+ wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING);
+
+ if (IS_ERR(tlink->tl_tcon)) {
+ cifs_put_tlink(tlink);
+ return ERR_PTR(-EACCES);
+ }
+
+ return tlink;
+}
+
+/*
+ * periodic workqueue job that scans tcon_tree for a superblock and closes
+ * out tcons.
+ */
+static void
+cifs_prune_tlinks(struct work_struct *work)
+{
+ struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info,
+ prune_tlinks.work);
+ struct rb_root *root = &cifs_sb->tlink_tree;
+ struct rb_node *node;
+ struct rb_node *tmp;
+ struct tcon_link *tlink;
+
+ /*
+ * Because we drop the spinlock in the loop in order to put the tlink
+ * it's not guarded against removal of links from the tree. The only
+ * places that remove entries from the tree are this function and
+ * umounts. Because this function is non-reentrant and is canceled
+ * before umount can proceed, this is safe.
+ */
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ node = rb_first(root);
+ while (node != NULL) {
+ tmp = node;
+ node = rb_next(tmp);
+ tlink = rb_entry(tmp, struct tcon_link, tl_rbnode);
+
+ if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) ||
+ atomic_read(&tlink->tl_count) != 0 ||
+ time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies))
+ continue;
+
+ cifs_get_tlink(tlink);
+ clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags);
+ rb_erase(tmp, root);
+
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+ cifs_put_tlink(tlink);
+ spin_lock(&cifs_sb->tlink_tree_lock);
+ }
+ spin_unlock(&cifs_sb->tlink_tree_lock);
+
+ queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks,
+ TLINK_IDLE_EXPIRE);
+}