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4225 lines
111 KiB
4225 lines
111 KiB
/* |
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* fs/cifs/connect.c |
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* |
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* Copyright (C) International Business Machines Corp., 2002,2011 |
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* Author(s): Steve French ([email protected]) |
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* |
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* This library is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published |
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* by the Free Software Foundation; either version 2.1 of the License, or |
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* (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
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* the GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include <linux/fs.h> |
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#include <linux/net.h> |
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#include <linux/string.h> |
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#include <linux/sched/mm.h> |
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#include <linux/sched/signal.h> |
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#include <linux/list.h> |
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#include <linux/wait.h> |
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#include <linux/slab.h> |
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#include <linux/pagemap.h> |
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#include <linux/ctype.h> |
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#include <linux/utsname.h> |
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#include <linux/mempool.h> |
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#include <linux/delay.h> |
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#include <linux/completion.h> |
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#include <linux/kthread.h> |
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#include <linux/pagevec.h> |
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#include <linux/freezer.h> |
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#include <linux/namei.h> |
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#include <linux/uuid.h> |
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#include <linux/uaccess.h> |
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#include <asm/processor.h> |
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#include <linux/inet.h> |
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#include <linux/module.h> |
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#include <keys/user-type.h> |
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#include <net/ipv6.h> |
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#include <linux/parser.h> |
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#include <linux/bvec.h> |
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#include "cifspdu.h" |
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#include "cifsglob.h" |
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#include "cifsproto.h" |
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#include "cifs_unicode.h" |
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#include "cifs_debug.h" |
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#include "cifs_fs_sb.h" |
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#include "ntlmssp.h" |
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#include "nterr.h" |
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#include "rfc1002pdu.h" |
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#include "fscache.h" |
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#include "smb2proto.h" |
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#include "smbdirect.h" |
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#include "dns_resolve.h" |
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#ifdef CONFIG_CIFS_DFS_UPCALL |
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#include "dfs_cache.h" |
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#endif |
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#include "fs_context.h" |
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#ifdef CONFIG_CIFS_SWN_UPCALL |
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#include "cifs_swn.h" |
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#endif |
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|
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extern mempool_t *cifs_req_poolp; |
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extern bool disable_legacy_dialects; |
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|
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/* FIXME: should these be tunable? */ |
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#define TLINK_ERROR_EXPIRE (1 * HZ) |
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#define TLINK_IDLE_EXPIRE (600 * HZ) |
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|
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/* Drop the connection to not overload the server */ |
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#define NUM_STATUS_IO_TIMEOUT 5 |
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|
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static int ip_connect(struct TCP_Server_Info *server); |
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static int generic_ip_connect(struct TCP_Server_Info *server); |
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static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink); |
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static void cifs_prune_tlinks(struct work_struct *work); |
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|
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/* |
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* Resolve hostname and set ip addr in tcp ses. Useful for hostnames that may |
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* get their ip addresses changed at some point. |
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* |
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* This should be called with server->srv_mutex held. |
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*/ |
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static int reconn_set_ipaddr_from_hostname(struct TCP_Server_Info *server) |
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{ |
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int rc; |
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int len; |
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char *unc, *ipaddr = NULL; |
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|
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if (!server->hostname) |
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return -EINVAL; |
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|
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len = strlen(server->hostname) + 3; |
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|
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unc = kmalloc(len, GFP_KERNEL); |
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if (!unc) { |
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cifs_dbg(FYI, "%s: failed to create UNC path\n", __func__); |
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return -ENOMEM; |
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} |
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scnprintf(unc, len, "\\\\%s", server->hostname); |
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|
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rc = dns_resolve_server_name_to_ip(unc, &ipaddr); |
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kfree(unc); |
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|
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if (rc < 0) { |
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cifs_dbg(FYI, "%s: failed to resolve server part of %s to IP: %d\n", |
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__func__, server->hostname, rc); |
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return rc; |
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} |
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|
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spin_lock(&cifs_tcp_ses_lock); |
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rc = cifs_convert_address((struct sockaddr *)&server->dstaddr, ipaddr, |
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strlen(ipaddr)); |
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spin_unlock(&cifs_tcp_ses_lock); |
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kfree(ipaddr); |
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|
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return !rc ? -1 : 0; |
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} |
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|
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#ifdef CONFIG_CIFS_DFS_UPCALL |
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/* These functions must be called with server->srv_mutex held */ |
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static void reconn_set_next_dfs_target(struct TCP_Server_Info *server, |
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struct cifs_sb_info *cifs_sb, |
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struct dfs_cache_tgt_list *tgt_list, |
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struct dfs_cache_tgt_iterator **tgt_it) |
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{ |
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const char *name; |
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int rc; |
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|
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if (!cifs_sb || !cifs_sb->origin_fullpath) |
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return; |
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|
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if (!*tgt_it) { |
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*tgt_it = dfs_cache_get_tgt_iterator(tgt_list); |
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} else { |
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*tgt_it = dfs_cache_get_next_tgt(tgt_list, *tgt_it); |
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if (!*tgt_it) |
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*tgt_it = dfs_cache_get_tgt_iterator(tgt_list); |
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} |
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|
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cifs_dbg(FYI, "%s: UNC: %s\n", __func__, cifs_sb->origin_fullpath); |
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|
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name = dfs_cache_get_tgt_name(*tgt_it); |
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|
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kfree(server->hostname); |
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|
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server->hostname = extract_hostname(name); |
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if (IS_ERR(server->hostname)) { |
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cifs_dbg(FYI, |
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"%s: failed to extract hostname from target: %ld\n", |
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__func__, PTR_ERR(server->hostname)); |
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return; |
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} |
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|
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rc = reconn_set_ipaddr_from_hostname(server); |
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if (rc) { |
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cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n", |
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__func__, rc); |
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} |
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} |
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|
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static inline int reconn_setup_dfs_targets(struct cifs_sb_info *cifs_sb, |
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struct dfs_cache_tgt_list *tl) |
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{ |
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if (!cifs_sb->origin_fullpath) |
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return -EOPNOTSUPP; |
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return dfs_cache_noreq_find(cifs_sb->origin_fullpath + 1, NULL, tl); |
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} |
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#endif |
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|
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/* |
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* cifs tcp session reconnection |
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* |
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* mark tcp session as reconnecting so temporarily locked |
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* mark all smb sessions as reconnecting for tcp session |
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* reconnect tcp session |
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* wake up waiters on reconnection? - (not needed currently) |
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*/ |
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int |
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cifs_reconnect(struct TCP_Server_Info *server) |
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{ |
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int rc = 0; |
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struct list_head *tmp, *tmp2; |
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struct cifs_ses *ses; |
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struct cifs_tcon *tcon; |
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struct mid_q_entry *mid_entry; |
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struct list_head retry_list; |
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#ifdef CONFIG_CIFS_DFS_UPCALL |
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struct super_block *sb = NULL; |
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struct cifs_sb_info *cifs_sb = NULL; |
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struct dfs_cache_tgt_list tgt_list = {0}; |
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struct dfs_cache_tgt_iterator *tgt_it = NULL; |
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#endif |
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|
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spin_lock(&GlobalMid_Lock); |
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server->nr_targets = 1; |
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#ifdef CONFIG_CIFS_DFS_UPCALL |
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spin_unlock(&GlobalMid_Lock); |
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sb = cifs_get_tcp_super(server); |
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if (IS_ERR(sb)) { |
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rc = PTR_ERR(sb); |
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cifs_dbg(FYI, "%s: will not do DFS failover: rc = %d\n", |
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__func__, rc); |
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sb = NULL; |
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} else { |
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cifs_sb = CIFS_SB(sb); |
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rc = reconn_setup_dfs_targets(cifs_sb, &tgt_list); |
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if (rc) { |
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cifs_sb = NULL; |
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if (rc != -EOPNOTSUPP) { |
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cifs_server_dbg(VFS, "%s: no target servers for DFS failover\n", |
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__func__); |
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} |
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} else { |
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server->nr_targets = dfs_cache_get_nr_tgts(&tgt_list); |
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} |
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} |
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cifs_dbg(FYI, "%s: will retry %d target(s)\n", __func__, |
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server->nr_targets); |
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spin_lock(&GlobalMid_Lock); |
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#endif |
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if (server->tcpStatus == CifsExiting) { |
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/* the demux thread will exit normally |
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next time through the loop */ |
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spin_unlock(&GlobalMid_Lock); |
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#ifdef CONFIG_CIFS_DFS_UPCALL |
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dfs_cache_free_tgts(&tgt_list); |
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cifs_put_tcp_super(sb); |
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#endif |
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wake_up(&server->response_q); |
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return rc; |
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} else |
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server->tcpStatus = CifsNeedReconnect; |
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spin_unlock(&GlobalMid_Lock); |
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server->maxBuf = 0; |
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server->max_read = 0; |
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|
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cifs_dbg(FYI, "Mark tcp session as need reconnect\n"); |
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trace_smb3_reconnect(server->CurrentMid, server->conn_id, server->hostname); |
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|
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/* before reconnecting the tcp session, mark the smb session (uid) |
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and the tid bad so they are not used until reconnected */ |
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cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n", |
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__func__); |
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spin_lock(&cifs_tcp_ses_lock); |
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list_for_each(tmp, &server->smb_ses_list) { |
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ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
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ses->need_reconnect = true; |
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list_for_each(tmp2, &ses->tcon_list) { |
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tcon = list_entry(tmp2, struct cifs_tcon, tcon_list); |
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tcon->need_reconnect = true; |
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} |
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if (ses->tcon_ipc) |
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ses->tcon_ipc->need_reconnect = true; |
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} |
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spin_unlock(&cifs_tcp_ses_lock); |
|
|
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/* do not want to be sending data on a socket we are freeing */ |
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cifs_dbg(FYI, "%s: tearing down socket\n", __func__); |
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mutex_lock(&server->srv_mutex); |
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if (server->ssocket) { |
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cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", |
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server->ssocket->state, server->ssocket->flags); |
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kernel_sock_shutdown(server->ssocket, SHUT_WR); |
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cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", |
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server->ssocket->state, server->ssocket->flags); |
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sock_release(server->ssocket); |
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server->ssocket = NULL; |
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} |
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server->sequence_number = 0; |
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server->session_estab = false; |
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kfree(server->session_key.response); |
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server->session_key.response = NULL; |
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server->session_key.len = 0; |
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server->lstrp = jiffies; |
|
|
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/* mark submitted MIDs for retry and issue callback */ |
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INIT_LIST_HEAD(&retry_list); |
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cifs_dbg(FYI, "%s: moving mids to private list\n", __func__); |
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spin_lock(&GlobalMid_Lock); |
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list_for_each_safe(tmp, tmp2, &server->pending_mid_q) { |
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mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
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kref_get(&mid_entry->refcount); |
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if (mid_entry->mid_state == MID_REQUEST_SUBMITTED) |
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mid_entry->mid_state = MID_RETRY_NEEDED; |
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list_move(&mid_entry->qhead, &retry_list); |
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mid_entry->mid_flags |= MID_DELETED; |
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} |
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spin_unlock(&GlobalMid_Lock); |
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mutex_unlock(&server->srv_mutex); |
|
|
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cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__); |
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list_for_each_safe(tmp, tmp2, &retry_list) { |
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mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
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list_del_init(&mid_entry->qhead); |
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mid_entry->callback(mid_entry); |
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cifs_mid_q_entry_release(mid_entry); |
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} |
|
|
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if (cifs_rdma_enabled(server)) { |
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mutex_lock(&server->srv_mutex); |
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smbd_destroy(server); |
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mutex_unlock(&server->srv_mutex); |
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} |
|
|
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do { |
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try_to_freeze(); |
|
|
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mutex_lock(&server->srv_mutex); |
|
|
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#ifdef CONFIG_CIFS_SWN_UPCALL |
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if (server->use_swn_dstaddr) { |
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server->dstaddr = server->swn_dstaddr; |
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} else { |
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#endif |
|
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL |
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if (cifs_sb && cifs_sb->origin_fullpath) |
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/* |
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* Set up next DFS target server (if any) for reconnect. If DFS |
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* feature is disabled, then we will retry last server we |
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* connected to before. |
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*/ |
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reconn_set_next_dfs_target(server, cifs_sb, &tgt_list, &tgt_it); |
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else { |
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#endif |
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/* |
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* Resolve the hostname again to make sure that IP address is up-to-date. |
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*/ |
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rc = reconn_set_ipaddr_from_hostname(server); |
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if (rc) { |
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cifs_dbg(FYI, "%s: failed to resolve hostname: %d\n", |
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__func__, rc); |
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} |
|
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL |
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} |
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#endif |
|
|
|
|
|
#ifdef CONFIG_CIFS_SWN_UPCALL |
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} |
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#endif |
|
|
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if (cifs_rdma_enabled(server)) |
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rc = smbd_reconnect(server); |
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else |
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rc = generic_ip_connect(server); |
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if (rc) { |
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cifs_dbg(FYI, "reconnect error %d\n", rc); |
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mutex_unlock(&server->srv_mutex); |
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msleep(3000); |
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} else { |
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atomic_inc(&tcpSesReconnectCount); |
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set_credits(server, 1); |
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spin_lock(&GlobalMid_Lock); |
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if (server->tcpStatus != CifsExiting) |
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server->tcpStatus = CifsNeedNegotiate; |
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spin_unlock(&GlobalMid_Lock); |
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#ifdef CONFIG_CIFS_SWN_UPCALL |
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server->use_swn_dstaddr = false; |
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#endif |
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mutex_unlock(&server->srv_mutex); |
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} |
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} while (server->tcpStatus == CifsNeedReconnect); |
|
|
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#ifdef CONFIG_CIFS_DFS_UPCALL |
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if (tgt_it) { |
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rc = dfs_cache_noreq_update_tgthint(cifs_sb->origin_fullpath + 1, |
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tgt_it); |
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if (rc) { |
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cifs_server_dbg(VFS, "%s: failed to update DFS target hint: rc = %d\n", |
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__func__, rc); |
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} |
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rc = dfs_cache_update_vol(cifs_sb->origin_fullpath, server); |
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if (rc) { |
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cifs_server_dbg(VFS, "%s: failed to update vol info in DFS cache: rc = %d\n", |
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__func__, rc); |
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} |
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dfs_cache_free_tgts(&tgt_list); |
|
|
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} |
|
|
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cifs_put_tcp_super(sb); |
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#endif |
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if (server->tcpStatus == CifsNeedNegotiate) |
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mod_delayed_work(cifsiod_wq, &server->echo, 0); |
|
|
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wake_up(&server->response_q); |
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return rc; |
|
} |
|
|
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static void |
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cifs_echo_request(struct work_struct *work) |
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{ |
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int rc; |
|
struct TCP_Server_Info *server = container_of(work, |
|
struct TCP_Server_Info, echo.work); |
|
unsigned long echo_interval; |
|
|
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/* |
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* 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; |
|
|
|
/* |
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* 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 || |
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(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); |
|
|
|
#ifdef CONFIG_CIFS_SWN_UPCALL |
|
/* Check witness registrations */ |
|
cifs_swn_check(); |
|
#endif |
|
|
|
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) && |
|
(!server->ops->can_echo || server->ops->can_echo(server)) && |
|
time_after(jiffies, server->lstrp + 3 * server->echo_interval)) { |
|
cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n", |
|
(3 * server->echo_interval) / HZ); |
|
cifs_reconnect(server); |
|
return true; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static inline bool |
|
zero_credits(struct TCP_Server_Info *server) |
|
{ |
|
int val; |
|
|
|
spin_lock(&server->req_lock); |
|
val = server->credits + server->echo_credits + server->oplock_credits; |
|
if (server->in_flight == 0 && val == 0) { |
|
spin_unlock(&server->req_lock); |
|
return true; |
|
} |
|
spin_unlock(&server->req_lock); |
|
return false; |
|
} |
|
|
|
static int |
|
cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg) |
|
{ |
|
int length = 0; |
|
int total_read; |
|
|
|
smb_msg->msg_control = NULL; |
|
smb_msg->msg_controllen = 0; |
|
|
|
for (total_read = 0; msg_data_left(smb_msg); total_read += length) { |
|
try_to_freeze(); |
|
|
|
/* reconnect if no credits and no requests in flight */ |
|
if (zero_credits(server)) { |
|
cifs_reconnect(server); |
|
return -ECONNABORTED; |
|
} |
|
|
|
if (server_unresponsive(server)) |
|
return -ECONNABORTED; |
|
if (cifs_rdma_enabled(server) && server->smbd_conn) |
|
length = smbd_recv(server->smbd_conn, smb_msg); |
|
else |
|
length = sock_recvmsg(server->ssocket, smb_msg, 0); |
|
|
|
if (server->tcpStatus == CifsExiting) |
|
return -ESHUTDOWN; |
|
|
|
if (server->tcpStatus == CifsNeedReconnect) { |
|
cifs_reconnect(server); |
|
return -ECONNABORTED; |
|
} |
|
|
|
if (length == -ERESTARTSYS || |
|
length == -EAGAIN || |
|
length == -EINTR) { |
|
/* |
|
* Minimum sleep to prevent looping, allowing socket |
|
* to clear and app threads to set tcpStatus |
|
* CifsNeedReconnect if server hung. |
|
*/ |
|
usleep_range(1000, 2000); |
|
length = 0; |
|
continue; |
|
} |
|
|
|
if (length <= 0) { |
|
cifs_dbg(FYI, "Received no data or error: %d\n", length); |
|
cifs_reconnect(server); |
|
return -ECONNABORTED; |
|
} |
|
} |
|
return total_read; |
|
} |
|
|
|
int |
|
cifs_read_from_socket(struct TCP_Server_Info *server, char *buf, |
|
unsigned int to_read) |
|
{ |
|
struct msghdr smb_msg; |
|
struct kvec iov = {.iov_base = buf, .iov_len = to_read}; |
|
iov_iter_kvec(&smb_msg.msg_iter, READ, &iov, 1, to_read); |
|
|
|
return cifs_readv_from_socket(server, &smb_msg); |
|
} |
|
|
|
ssize_t |
|
cifs_discard_from_socket(struct TCP_Server_Info *server, size_t to_read) |
|
{ |
|
struct msghdr smb_msg; |
|
|
|
/* |
|
* iov_iter_discard already sets smb_msg.type and count and iov_offset |
|
* and cifs_readv_from_socket sets msg_control and msg_controllen |
|
* so little to initialize in struct msghdr |
|
*/ |
|
smb_msg.msg_name = NULL; |
|
smb_msg.msg_namelen = 0; |
|
iov_iter_discard(&smb_msg.msg_iter, READ, to_read); |
|
|
|
return cifs_readv_from_socket(server, &smb_msg); |
|
} |
|
|
|
int |
|
cifs_read_page_from_socket(struct TCP_Server_Info *server, struct page *page, |
|
unsigned int page_offset, unsigned int to_read) |
|
{ |
|
struct msghdr smb_msg; |
|
struct bio_vec bv = { |
|
.bv_page = page, .bv_len = to_read, .bv_offset = page_offset}; |
|
iov_iter_bvec(&smb_msg.msg_iter, READ, &bv, 1, to_read); |
|
return cifs_readv_from_socket(server, &smb_msg); |
|
} |
|
|
|
static bool |
|
is_smb_response(struct TCP_Server_Info *server, unsigned char type) |
|
{ |
|
/* |
|
* The first byte big endian of the length field, |
|
* is actually not part of the length but the type |
|
* with the most common, zero, as regular data. |
|
*/ |
|
switch (type) { |
|
case RFC1002_SESSION_MESSAGE: |
|
/* Regular SMB response */ |
|
return true; |
|
case RFC1002_SESSION_KEEP_ALIVE: |
|
cifs_dbg(FYI, "RFC 1002 session keep alive\n"); |
|
break; |
|
case RFC1002_POSITIVE_SESSION_RESPONSE: |
|
cifs_dbg(FYI, "RFC 1002 positive session response\n"); |
|
break; |
|
case RFC1002_NEGATIVE_SESSION_RESPONSE: |
|
/* |
|
* We get this from Windows 98 instead of an error on |
|
* SMB negprot response. |
|
*/ |
|
cifs_dbg(FYI, "RFC 1002 negative session response\n"); |
|
/* give server a second to clean up */ |
|
msleep(1000); |
|
/* |
|
* Always try 445 first on reconnect since we get NACK |
|
* on some if we ever connected to port 139 (the NACK |
|
* is since we do not begin with RFC1001 session |
|
* initialize frame). |
|
*/ |
|
cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT); |
|
cifs_reconnect(server); |
|
break; |
|
default: |
|
cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type); |
|
cifs_reconnect(server); |
|
} |
|
|
|
return false; |
|
} |
|
|
|
void |
|
dequeue_mid(struct mid_q_entry *mid, bool malformed) |
|
{ |
|
#ifdef CONFIG_CIFS_STATS2 |
|
mid->when_received = jiffies; |
|
#endif |
|
spin_lock(&GlobalMid_Lock); |
|
if (!malformed) |
|
mid->mid_state = MID_RESPONSE_RECEIVED; |
|
else |
|
mid->mid_state = MID_RESPONSE_MALFORMED; |
|
/* |
|
* Trying to handle/dequeue a mid after the send_recv() |
|
* function has finished processing it is a bug. |
|
*/ |
|
if (mid->mid_flags & MID_DELETED) |
|
pr_warn_once("trying to dequeue a deleted mid\n"); |
|
else { |
|
list_del_init(&mid->qhead); |
|
mid->mid_flags |= MID_DELETED; |
|
} |
|
spin_unlock(&GlobalMid_Lock); |
|
} |
|
|
|
static unsigned int |
|
smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server) |
|
{ |
|
struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer; |
|
|
|
/* |
|
* SMB1 does not use credits. |
|
*/ |
|
if (server->vals->header_preamble_size) |
|
return 0; |
|
|
|
return le16_to_cpu(shdr->CreditRequest); |
|
} |
|
|
|
static void |
|
handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server, |
|
char *buf, int malformed) |
|
{ |
|
if (server->ops->check_trans2 && |
|
server->ops->check_trans2(mid, server, buf, malformed)) |
|
return; |
|
mid->credits_received = smb2_get_credits_from_hdr(buf, server); |
|
mid->resp_buf = buf; |
|
mid->large_buf = server->large_buf; |
|
/* Was previous buf put in mpx struct for multi-rsp? */ |
|
if (!mid->multiRsp) { |
|
/* smb buffer will be freed by user thread */ |
|
if (server->large_buf) |
|
server->bigbuf = NULL; |
|
else |
|
server->smallbuf = NULL; |
|
} |
|
dequeue_mid(mid, malformed); |
|
} |
|
|
|
static void clean_demultiplex_info(struct TCP_Server_Info *server) |
|
{ |
|
int length; |
|
|
|
/* take it off the list, if it's not already */ |
|
spin_lock(&cifs_tcp_ses_lock); |
|
list_del_init(&server->tcp_ses_list); |
|
spin_unlock(&cifs_tcp_ses_lock); |
|
|
|
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 %llu\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 %llu\n", mid_entry->mid); |
|
list_del_init(&mid_entry->qhead); |
|
mid_entry->callback(mid_entry); |
|
cifs_mid_q_entry_release(mid_entry); |
|
} |
|
/* 1/8th of sec is more than enough time for them to exit */ |
|
msleep(125); |
|
} |
|
|
|
if (!list_empty(&server->pending_mid_q)) { |
|
/* |
|
* mpx threads have not exited yet give them at least the smb |
|
* send timeout time for long ops. |
|
* |
|
* Due to delays on oplock break requests, we need to wait at |
|
* least 45 seconds before giving up on a request getting a |
|
* response and going ahead and killing cifsd. |
|
*/ |
|
cifs_dbg(FYI, "Wait for exit from demultiplex thread\n"); |
|
msleep(46000); |
|
/* |
|
* If threads still have not exited they are probably never |
|
* coming home not much else we can do but free the memory. |
|
*/ |
|
} |
|
|
|
kfree(server->hostname); |
|
kfree(server); |
|
|
|
length = atomic_dec_return(&tcpSesAllocCount); |
|
if (length > 0) |
|
mempool_resize(cifs_req_poolp, length + cifs_min_rcv); |
|
} |
|
|
|
static int |
|
standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) |
|
{ |
|
int length; |
|
char *buf = server->smallbuf; |
|
unsigned int pdu_length = server->pdu_size; |
|
|
|
/* make sure this will fit in a large buffer */ |
|
if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - |
|
server->vals->header_preamble_size) { |
|
cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length); |
|
cifs_reconnect(server); |
|
return -ECONNABORTED; |
|
} |
|
|
|
/* switch to large buffer if too big for a small one */ |
|
if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) { |
|
server->large_buf = true; |
|
memcpy(server->bigbuf, buf, server->total_read); |
|
buf = server->bigbuf; |
|
} |
|
|
|
/* now read the rest */ |
|
length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, |
|
pdu_length - HEADER_SIZE(server) + 1 |
|
+ server->vals->header_preamble_size); |
|
|
|
if (length < 0) |
|
return length; |
|
server->total_read += length; |
|
|
|
dump_smb(buf, server->total_read); |
|
|
|
return cifs_handle_standard(server, mid); |
|
} |
|
|
|
int |
|
cifs_handle_standard(struct TCP_Server_Info *server, struct mid_q_entry *mid) |
|
{ |
|
char *buf = server->large_buf ? server->bigbuf : server->smallbuf; |
|
int length; |
|
|
|
/* |
|
* We know that we received enough to get to the MID as we |
|
* checked the pdu_length earlier. Now check to see |
|
* if the rest of the header is OK. We borrow the length |
|
* var for the rest of the loop to avoid a new stack var. |
|
* |
|
* 48 bytes is enough to display the header and a little bit |
|
* into the payload for debugging purposes. |
|
*/ |
|
length = server->ops->check_message(buf, server->total_read, server); |
|
if (length != 0) |
|
cifs_dump_mem("Bad SMB: ", buf, |
|
min_t(unsigned int, server->total_read, 48)); |
|
|
|
if (server->ops->is_session_expired && |
|
server->ops->is_session_expired(buf)) { |
|
cifs_reconnect(server); |
|
return -1; |
|
} |
|
|
|
if (server->ops->is_status_pending && |
|
server->ops->is_status_pending(buf, server)) |
|
return -1; |
|
|
|
if (!mid) |
|
return length; |
|
|
|
handle_mid(mid, server, buf, length); |
|
return 0; |
|
} |
|
|
|
static void |
|
smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server) |
|
{ |
|
struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)buffer; |
|
int scredits, in_flight; |
|
|
|
/* |
|
* 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); |
|
scredits = server->credits; |
|
in_flight = server->in_flight; |
|
spin_unlock(&server->req_lock); |
|
wake_up(&server->request_q); |
|
|
|
trace_smb3_add_credits(server->CurrentMid, |
|
server->conn_id, server->hostname, scredits, |
|
le16_to_cpu(shdr->CreditRequest), in_flight); |
|
cifs_server_dbg(FYI, "%s: added %u credits total=%d\n", |
|
__func__, le16_to_cpu(shdr->CreditRequest), |
|
scredits); |
|
} |
|
} |
|
|
|
|
|
static int |
|
cifs_demultiplex_thread(void *p) |
|
{ |
|
int i, num_mids, length; |
|
struct TCP_Server_Info *server = p; |
|
unsigned int pdu_length; |
|
unsigned int next_offset; |
|
char *buf = NULL; |
|
struct task_struct *task_to_wake = NULL; |
|
struct mid_q_entry *mids[MAX_COMPOUND]; |
|
char *bufs[MAX_COMPOUND]; |
|
unsigned int noreclaim_flag, num_io_timeout = 0; |
|
|
|
noreclaim_flag = memalloc_noreclaim_save(); |
|
cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current)); |
|
|
|
length = atomic_inc_return(&tcpSesAllocCount); |
|
if (length > 1) |
|
mempool_resize(cifs_req_poolp, length + cifs_min_rcv); |
|
|
|
set_freezable(); |
|
allow_kernel_signal(SIGKILL); |
|
while (server->tcpStatus != CifsExiting) { |
|
if (try_to_freeze()) |
|
continue; |
|
|
|
if (!allocate_buffers(server)) |
|
continue; |
|
|
|
server->large_buf = false; |
|
buf = server->smallbuf; |
|
pdu_length = 4; /* enough to get RFC1001 header */ |
|
|
|
length = cifs_read_from_socket(server, buf, pdu_length); |
|
if (length < 0) |
|
continue; |
|
|
|
if (server->vals->header_preamble_size == 0) |
|
server->total_read = 0; |
|
else |
|
server->total_read = length; |
|
|
|
/* |
|
* The right amount was read from socket - 4 bytes, |
|
* so we can now interpret the length field. |
|
*/ |
|
pdu_length = get_rfc1002_length(buf); |
|
|
|
cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length); |
|
if (!is_smb_response(server, buf[0])) |
|
continue; |
|
next_pdu: |
|
server->pdu_size = pdu_length; |
|
|
|
/* make sure we have enough to get to the MID */ |
|
if (server->pdu_size < HEADER_SIZE(server) - 1 - |
|
server->vals->header_preamble_size) { |
|
cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n", |
|
server->pdu_size); |
|
cifs_reconnect(server); |
|
continue; |
|
} |
|
|
|
/* read down to the MID */ |
|
length = cifs_read_from_socket(server, |
|
buf + server->vals->header_preamble_size, |
|
HEADER_SIZE(server) - 1 |
|
- server->vals->header_preamble_size); |
|
if (length < 0) |
|
continue; |
|
server->total_read += length; |
|
|
|
if (server->ops->next_header) { |
|
next_offset = server->ops->next_header(buf); |
|
if (next_offset) |
|
server->pdu_size = next_offset; |
|
} |
|
|
|
memset(mids, 0, sizeof(mids)); |
|
memset(bufs, 0, sizeof(bufs)); |
|
num_mids = 0; |
|
|
|
if (server->ops->is_transform_hdr && |
|
server->ops->receive_transform && |
|
server->ops->is_transform_hdr(buf)) { |
|
length = server->ops->receive_transform(server, |
|
mids, |
|
bufs, |
|
&num_mids); |
|
} else { |
|
mids[0] = server->ops->find_mid(server, buf); |
|
bufs[0] = buf; |
|
num_mids = 1; |
|
|
|
if (!mids[0] || !mids[0]->receive) |
|
length = standard_receive3(server, mids[0]); |
|
else |
|
length = mids[0]->receive(server, mids[0]); |
|
} |
|
|
|
if (length < 0) { |
|
for (i = 0; i < num_mids; i++) |
|
if (mids[i]) |
|
cifs_mid_q_entry_release(mids[i]); |
|
continue; |
|
} |
|
|
|
if (server->ops->is_status_io_timeout && |
|
server->ops->is_status_io_timeout(buf)) { |
|
num_io_timeout++; |
|
if (num_io_timeout > NUM_STATUS_IO_TIMEOUT) { |
|
cifs_reconnect(server); |
|
num_io_timeout = 0; |
|
continue; |
|
} |
|
} |
|
|
|
server->lstrp = jiffies; |
|
|
|
for (i = 0; i < num_mids; i++) { |
|
if (mids[i] != NULL) { |
|
mids[i]->resp_buf_size = server->pdu_size; |
|
|
|
if (bufs[i] && server->ops->is_network_name_deleted) |
|
server->ops->is_network_name_deleted(bufs[i], |
|
server); |
|
|
|
if (!mids[i]->multiRsp || mids[i]->multiEnd) |
|
mids[i]->callback(mids[i]); |
|
|
|
cifs_mid_q_entry_release(mids[i]); |
|
} else if (server->ops->is_oplock_break && |
|
server->ops->is_oplock_break(bufs[i], |
|
server)) { |
|
smb2_add_credits_from_hdr(bufs[i], server); |
|
cifs_dbg(FYI, "Received oplock break\n"); |
|
} else { |
|
cifs_server_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n", |
|
atomic_read(&midCount)); |
|
cifs_dump_mem("Received Data is: ", bufs[i], |
|
HEADER_SIZE(server)); |
|
smb2_add_credits_from_hdr(bufs[i], server); |
|
#ifdef CONFIG_CIFS_DEBUG2 |
|
if (server->ops->dump_detail) |
|
server->ops->dump_detail(bufs[i], |
|
server); |
|
cifs_dump_mids(server); |
|
#endif /* CIFS_DEBUG2 */ |
|
} |
|
} |
|
|
|
if (pdu_length > server->pdu_size) { |
|
if (!allocate_buffers(server)) |
|
continue; |
|
pdu_length -= server->pdu_size; |
|
server->total_read = 0; |
|
server->large_buf = false; |
|
buf = server->smallbuf; |
|
goto next_pdu; |
|
} |
|
} /* end while !EXITING */ |
|
|
|
/* buffer usually freed in free_mid - need to free it here on exit */ |
|
cifs_buf_release(server->bigbuf); |
|
if (server->smallbuf) /* no sense logging a debug message if NULL */ |
|
cifs_small_buf_release(server->smallbuf); |
|
|
|
task_to_wake = xchg(&server->tsk, NULL); |
|
clean_demultiplex_info(server); |
|
|
|
/* if server->tsk was NULL then wait for a signal before exiting */ |
|
if (!task_to_wake) { |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
while (!signal_pending(current)) { |
|
schedule(); |
|
set_current_state(TASK_INTERRUPTIBLE); |
|
} |
|
set_current_state(TASK_RUNNING); |
|
} |
|
|
|
memalloc_noreclaim_restore(noreclaim_flag); |
|
module_put_and_exit(0); |
|
} |
|
|
|
/** |
|
* Returns true if srcaddr isn't specified and rhs isn't specified, or |
|
* if srcaddr is specified and matches the IP address of the rhs argument |
|
*/ |
|
bool |
|
cifs_match_ipaddr(struct sockaddr *srcaddr, struct sockaddr *rhs) |
|
{ |
|
switch (srcaddr->sa_family) { |
|
case AF_UNSPEC: |
|
return (rhs->sa_family == AF_UNSPEC); |
|
case AF_INET: { |
|
struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr; |
|
struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs; |
|
return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr); |
|
} |
|
case AF_INET6: { |
|
struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr; |
|
struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs; |
|
return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr); |
|
} |
|
default: |
|
WARN_ON(1); |
|
return false; /* don't expect to be here */ |
|
} |
|
} |
|
|
|
/* |
|
* If no port is specified in addr structure, we try to match with 445 port |
|
* and if it fails - with 139 ports. It should be called only if address |
|
* families of server and addr are equal. |
|
*/ |
|
static bool |
|
match_port(struct TCP_Server_Info *server, struct sockaddr *addr) |
|
{ |
|
__be16 port, *sport; |
|
|
|
/* SMBDirect manages its own ports, don't match it here */ |
|
if (server->rdma) |
|
return true; |
|
|
|
switch (addr->sa_family) { |
|
case AF_INET: |
|
sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port; |
|
port = ((struct sockaddr_in *) addr)->sin_port; |
|
break; |
|
case AF_INET6: |
|
sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port; |
|
port = ((struct sockaddr_in6 *) addr)->sin6_port; |
|
break; |
|
default: |
|
WARN_ON(1); |
|
return false; |
|
} |
|
|
|
if (!port) { |
|
port = htons(CIFS_PORT); |
|
if (port == *sport) |
|
return true; |
|
|
|
port = htons(RFC1001_PORT); |
|
} |
|
|
|
return port == *sport; |
|
} |
|
|
|
static bool |
|
match_address(struct TCP_Server_Info *server, struct sockaddr *addr, |
|
struct sockaddr *srcaddr) |
|
{ |
|
switch (addr->sa_family) { |
|
case AF_INET: { |
|
struct sockaddr_in *addr4 = (struct sockaddr_in *)addr; |
|
struct sockaddr_in *srv_addr4 = |
|
(struct sockaddr_in *)&server->dstaddr; |
|
|
|
if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr) |
|
return false; |
|
break; |
|
} |
|
case AF_INET6: { |
|
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr; |
|
struct sockaddr_in6 *srv_addr6 = |
|
(struct sockaddr_in6 *)&server->dstaddr; |
|
|
|
if (!ipv6_addr_equal(&addr6->sin6_addr, |
|
&srv_addr6->sin6_addr)) |
|
return false; |
|
if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id) |
|
return false; |
|
break; |
|
} |
|
default: |
|
WARN_ON(1); |
|
return false; /* don't expect to be here */ |
|
} |
|
|
|
if (!cifs_match_ipaddr(srcaddr, (struct sockaddr *)&server->srcaddr)) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static bool |
|
match_security(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) |
|
{ |
|
/* |
|
* The select_sectype function should either return the ctx->sectype |
|
* that was specified, or "Unspecified" if that sectype was not |
|
* compatible with the given NEGOTIATE request. |
|
*/ |
|
if (server->ops->select_sectype(server, ctx->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 (ctx->sign && !server->sign) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx) |
|
{ |
|
struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr; |
|
|
|
if (ctx->nosharesock) |
|
return 0; |
|
|
|
/* If multidialect negotiation see if existing sessions match one */ |
|
if (strcmp(ctx->vals->version_string, SMB3ANY_VERSION_STRING) == 0) { |
|
if (server->vals->protocol_id < SMB30_PROT_ID) |
|
return 0; |
|
} else if (strcmp(ctx->vals->version_string, |
|
SMBDEFAULT_VERSION_STRING) == 0) { |
|
if (server->vals->protocol_id < SMB21_PROT_ID) |
|
return 0; |
|
} else if ((server->vals != ctx->vals) || (server->ops != ctx->ops)) |
|
return 0; |
|
|
|
if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns)) |
|
return 0; |
|
|
|
if (!match_address(server, addr, |
|
(struct sockaddr *)&ctx->srcaddr)) |
|
return 0; |
|
|
|
if (!match_port(server, addr)) |
|
return 0; |
|
|
|
if (!match_security(server, ctx)) |
|
return 0; |
|
|
|
if (server->echo_interval != ctx->echo_interval * HZ) |
|
return 0; |
|
|
|
if (server->rdma != ctx->rdma) |
|
return 0; |
|
|
|
if (server->ignore_signature != ctx->ignore_signature) |
|
return 0; |
|
|
|
if (server->min_offload != ctx->min_offload) |
|
return 0; |
|
|
|
return 1; |
|
} |
|
|
|
struct TCP_Server_Info * |
|
cifs_find_tcp_session(struct smb3_fs_context *ctx) |
|
{ |
|
struct TCP_Server_Info *server; |
|
|
|
spin_lock(&cifs_tcp_ses_lock); |
|
list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { |
|
/* |
|
* Skip ses channels since they're only handled in lower layers |
|
* (e.g. cifs_send_recv). |
|
*/ |
|
if (server->is_channel || !match_server(server, ctx)) |
|
continue; |
|
|
|
++server->srv_count; |
|
spin_unlock(&cifs_tcp_ses_lock); |
|
cifs_dbg(FYI, "Existing tcp session with server found\n"); |
|
return server; |
|
} |
|
spin_unlock(&cifs_tcp_ses_lock); |
|
return NULL; |
|
} |
|
|
|
void |
|
cifs_put_tcp_session(struct TCP_Server_Info *server, int from_reconnect) |
|
{ |
|
struct task_struct *task; |
|
|
|
spin_lock(&cifs_tcp_ses_lock); |
|
if (--server->srv_count > 0) { |
|
spin_unlock(&cifs_tcp_ses_lock); |
|
return; |
|
} |
|
|
|
put_net(cifs_net_ns(server)); |
|
|
|
list_del_init(&server->tcp_ses_list); |
|
spin_unlock(&cifs_tcp_ses_lock); |
|
|
|
cancel_delayed_work_sync(&server->echo); |
|
|
|
if (from_reconnect) |
|
/* |
|
* Avoid deadlock here: reconnect work calls |
|
* cifs_put_tcp_session() at its end. Need to be sure |
|
* that reconnect work does nothing with server pointer after |
|
* that step. |
|
*/ |
|
cancel_delayed_work(&server->reconnect); |
|
else |
|
cancel_delayed_work_sync(&server->reconnect); |
|
|
|
spin_lock(&GlobalMid_Lock); |
|
server->tcpStatus = CifsExiting; |
|
spin_unlock(&GlobalMid_Lock); |
|
|
|
cifs_crypto_secmech_release(server); |
|
cifs_fscache_release_client_cookie(server); |
|
|
|
kfree(server->session_key.response); |
|
server->session_key.response = NULL; |
|
server->session_key.len = 0; |
|
|
|
task = xchg(&server->tsk, NULL); |
|
if (task) |
|
send_sig(SIGKILL, task, 1); |
|
} |
|
|
|
struct TCP_Server_Info * |
|
cifs_get_tcp_session(struct smb3_fs_context *ctx) |
|
{ |
|
struct TCP_Server_Info *tcp_ses = NULL; |
|
int rc; |
|
|
|
cifs_dbg(FYI, "UNC: %s\n", ctx->UNC); |
|
|
|
/* see if we already have a matching tcp_ses */ |
|
tcp_ses = cifs_find_tcp_session(ctx); |
|
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 = ctx->ops; |
|
tcp_ses->vals = ctx->vals; |
|
cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns)); |
|
tcp_ses->hostname = extract_hostname(ctx->UNC); |
|
if (IS_ERR(tcp_ses->hostname)) { |
|
rc = PTR_ERR(tcp_ses->hostname); |
|
goto out_err_crypto_release; |
|
} |
|
|
|
tcp_ses->conn_id = atomic_inc_return(&tcpSesNextId); |
|
tcp_ses->noblockcnt = ctx->rootfs; |
|
tcp_ses->noblocksnd = ctx->noblocksnd || ctx->rootfs; |
|
tcp_ses->noautotune = ctx->noautotune; |
|
tcp_ses->tcp_nodelay = ctx->sockopt_tcp_nodelay; |
|
tcp_ses->rdma = ctx->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, |
|
ctx->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); |
|
memcpy(tcp_ses->server_RFC1001_name, |
|
ctx->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(ctx->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, &ctx->srcaddr, |
|
sizeof(tcp_ses->srcaddr)); |
|
memcpy(&tcp_ses->dstaddr, &ctx->dstaddr, |
|
sizeof(tcp_ses->dstaddr)); |
|
if (ctx->use_client_guid) |
|
memcpy(tcp_ses->client_guid, ctx->client_guid, |
|
SMB2_CLIENT_GUID_SIZE); |
|
else |
|
generate_random_uuid(tcp_ses->client_guid); |
|
/* |
|
* at this point we are the only ones with the pointer |
|
* to the struct since the kernel thread not created yet |
|
* no need to spinlock this init of tcpStatus or srv_count |
|
*/ |
|
tcp_ses->tcpStatus = CifsNew; |
|
++tcp_ses->srv_count; |
|
|
|
if (ctx->echo_interval >= SMB_ECHO_INTERVAL_MIN && |
|
ctx->echo_interval <= SMB_ECHO_INTERVAL_MAX) |
|
tcp_ses->echo_interval = ctx->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 *)&ctx->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 = ctx->min_offload; |
|
tcp_ses->tcpStatus = CifsNeedNegotiate; |
|
|
|
if ((ctx->max_credits < 20) || (ctx->max_credits > 60000)) |
|
tcp_ses->max_credits = SMB2_MAX_CREDITS_AVAILABLE; |
|
else |
|
tcp_ses->max_credits = ctx->max_credits; |
|
|
|
tcp_ses->nr_targets = 1; |
|
tcp_ses->ignore_signature = ctx->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 smb3_fs_context *ctx) |
|
{ |
|
if (ctx->sectype != Unspecified && |
|
ctx->sectype != ses->sectype) |
|
return 0; |
|
|
|
/* |
|
* If an existing session is limited to less channels than |
|
* requested, it should not be reused |
|
*/ |
|
if (ses->chan_max < ctx->max_channels) |
|
return 0; |
|
|
|
switch (ses->sectype) { |
|
case Kerberos: |
|
if (!uid_eq(ctx->cred_uid, ses->cred_uid)) |
|
return 0; |
|
break; |
|
default: |
|
/* NULL username means anonymous session */ |
|
if (ses->user_name == NULL) { |
|
if (!ctx->nullauth) |
|
return 0; |
|
break; |
|
} |
|
|
|
/* anything else takes username/password */ |
|
if (strncmp(ses->user_name, |
|
ctx->username ? ctx->username : "", |
|
CIFS_MAX_USERNAME_LEN)) |
|
return 0; |
|
if ((ctx->username && strlen(ctx->username) != 0) && |
|
ses->password != NULL && |
|
strncmp(ses->password, |
|
ctx->password ? ctx->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 smb3_fs_context *ctx) |
|
{ |
|
int rc = 0, xid; |
|
struct cifs_tcon *tcon; |
|
char unc[SERVER_NAME_LENGTH + sizeof("//x/IPC$")] = {0}; |
|
bool seal = false; |
|
struct TCP_Server_Info *server = ses->server; |
|
|
|
/* |
|
* If the mount request that resulted in the creation of the |
|
* session requires encryption, force IPC to be encrypted too. |
|
*/ |
|
if (ctx->seal) { |
|
if (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) |
|
seal = true; |
|
else { |
|
cifs_server_dbg(VFS, |
|
"IPC: server doesn't support encryption\n"); |
|
return -EOPNOTSUPP; |
|
} |
|
} |
|
|
|
tcon = tconInfoAlloc(); |
|
if (tcon == NULL) |
|
return -ENOMEM; |
|
|
|
scnprintf(unc, sizeof(unc), "\\\\%s\\IPC$", server->hostname); |
|
|
|
xid = get_xid(); |
|
tcon->ses = ses; |
|
tcon->ipc = true; |
|
tcon->seal = seal; |
|
rc = server->ops->tree_connect(xid, ses, unc, tcon, ctx->local_nls); |
|
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: |
|
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 smb3_fs_context *ctx) |
|
{ |
|
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, ctx)) |
|
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; |
|
} |
|
if (ses->status == CifsGood) |
|
ses->status = CifsExiting; |
|
spin_unlock(&cifs_tcp_ses_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); |
|
|
|
/* close any extra channels */ |
|
if (ses->chan_count > 1) { |
|
int i; |
|
|
|
for (i = 1; i < ses->chan_count; i++) |
|
cifs_put_tcp_session(ses->chans[i].server, 0); |
|
} |
|
|
|
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 smb3_fs_context *ctx, 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; |
|
} |
|
|
|
ctx->username = kstrndup(payload, len, GFP_KERNEL); |
|
if (!ctx->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__, ctx->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(ctx->username); |
|
ctx->username = NULL; |
|
goto out_key_put; |
|
} |
|
|
|
++delim; |
|
ctx->password = kstrndup(delim, len, GFP_KERNEL); |
|
if (!ctx->password) { |
|
cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n", |
|
len); |
|
rc = -ENOMEM; |
|
kfree(ctx->username); |
|
ctx->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) { |
|
ctx->domainname = kstrndup(ses->domainName, |
|
strlen(ses->domainName), |
|
GFP_KERNEL); |
|
if (!ctx->domainname) { |
|
cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n", |
|
len); |
|
rc = -ENOMEM; |
|
kfree(ctx->username); |
|
ctx->username = NULL; |
|
kfree_sensitive(ctx->password); |
|
ctx->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 smb3_fs_context *ctx __attribute__((unused)), |
|
struct cifs_ses *ses __attribute__((unused))) |
|
{ |
|
return -ENOSYS; |
|
} |
|
#endif /* CONFIG_KEYS */ |
|
|
|
/** |
|
* cifs_get_smb_ses - get a session matching @ctx 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 smb3_fs_context *ctx) |
|
{ |
|
int rc = -ENOMEM; |
|
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, ctx); |
|
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, |
|
ctx->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; |
|
} |
|
|
|
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->ip_addr, "%pI6", &addr6->sin6_addr); |
|
else |
|
sprintf(ses->ip_addr, "%pI4", &addr->sin_addr); |
|
|
|
if (ctx->username) { |
|
ses->user_name = kstrdup(ctx->username, GFP_KERNEL); |
|
if (!ses->user_name) |
|
goto get_ses_fail; |
|
} |
|
|
|
/* ctx->password freed at unmount */ |
|
if (ctx->password) { |
|
ses->password = kstrdup(ctx->password, GFP_KERNEL); |
|
if (!ses->password) |
|
goto get_ses_fail; |
|
} |
|
if (ctx->domainname) { |
|
ses->domainName = kstrdup(ctx->domainname, GFP_KERNEL); |
|
if (!ses->domainName) |
|
goto get_ses_fail; |
|
} |
|
if (ctx->domainauto) |
|
ses->domainAuto = ctx->domainauto; |
|
ses->cred_uid = ctx->cred_uid; |
|
ses->linux_uid = ctx->linux_uid; |
|
|
|
ses->sectype = ctx->sectype; |
|
ses->sign = ctx->sign; |
|
mutex_lock(&ses->session_mutex); |
|
|
|
/* add server as first channel */ |
|
ses->chans[0].server = server; |
|
ses->chan_count = 1; |
|
ses->chan_max = ctx->multichannel ? ctx->max_channels:1; |
|
|
|
rc = cifs_negotiate_protocol(xid, ses); |
|
if (!rc) |
|
rc = cifs_setup_session(xid, ses, ctx->local_nls); |
|
|
|
/* each channel uses a different signing key */ |
|
memcpy(ses->chans[0].signkey, ses->smb3signingkey, |
|
sizeof(ses->smb3signingkey)); |
|
|
|
mutex_unlock(&ses->session_mutex); |
|
if (rc) |
|
goto get_ses_fail; |
|
|
|
/* success, put it on the list and add it as first channel */ |
|
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, ctx); |
|
|
|
return ses; |
|
|
|
get_ses_fail: |
|
sesInfoFree(ses); |
|
free_xid(xid); |
|
return ERR_PTR(rc); |
|
} |
|
|
|
static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) |
|
{ |
|
if (tcon->tidStatus == CifsExiting) |
|
return 0; |
|
if (strncmp(tcon->treeName, ctx->UNC, MAX_TREE_SIZE)) |
|
return 0; |
|
if (tcon->seal != ctx->seal) |
|
return 0; |
|
if (tcon->snapshot_time != ctx->snapshot_time) |
|
return 0; |
|
if (tcon->handle_timeout != ctx->handle_timeout) |
|
return 0; |
|
if (tcon->no_lease != ctx->no_lease) |
|
return 0; |
|
if (tcon->nodelete != ctx->nodelete) |
|
return 0; |
|
return 1; |
|
} |
|
|
|
static struct cifs_tcon * |
|
cifs_find_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx) |
|
{ |
|
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, ctx)) |
|
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; |
|
} |
|
|
|
#ifdef CONFIG_CIFS_SWN_UPCALL |
|
if (tcon->use_witness) { |
|
int rc; |
|
|
|
rc = cifs_swn_unregister(tcon); |
|
if (rc < 0) { |
|
cifs_dbg(VFS, "%s: Failed to unregister for witness notifications: %d\n", |
|
__func__, rc); |
|
} |
|
} |
|
#endif |
|
|
|
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 @ctx 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 smb3_fs_context *ctx) |
|
{ |
|
int rc, xid; |
|
struct cifs_tcon *tcon; |
|
|
|
tcon = cifs_find_tcon(ses, ctx); |
|
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 (ctx->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 = ctx->snapshot_time; |
|
} |
|
|
|
if (ctx->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 = ctx->handle_timeout; |
|
} |
|
|
|
tcon->ses = ses; |
|
if (ctx->password) { |
|
tcon->password = kstrdup(ctx->password, GFP_KERNEL); |
|
if (!tcon->password) { |
|
rc = -ENOMEM; |
|
goto out_fail; |
|
} |
|
} |
|
|
|
if (ctx->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 (ctx->linux_ext) { |
|
if (ses->server->posix_ext_supported) { |
|
tcon->posix_extensions = true; |
|
pr_warn_once("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, ctx->UNC, tcon, |
|
ctx->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 (ctx->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) |
|
&& (ctx->nopersistent == false)) { |
|
cifs_dbg(FYI, "enabling persistent handles\n"); |
|
tcon->use_persistent = true; |
|
} else if (ctx->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; |
|
} |
|
#ifdef CONFIG_CIFS_SWN_UPCALL |
|
tcon->use_witness = false; |
|
if (ctx->witness) { |
|
if (ses->server->vals->protocol_id >= SMB30_PROT_ID) { |
|
if (tcon->capabilities & SMB2_SHARE_CAP_CLUSTER) { |
|
/* |
|
* Set witness in use flag in first place |
|
* to retry registration in the echo task |
|
*/ |
|
tcon->use_witness = true; |
|
/* And try to register immediately */ |
|
rc = cifs_swn_register(tcon); |
|
if (rc < 0) { |
|
cifs_dbg(VFS, "Failed to register for witness notifications: %d\n", rc); |
|
goto out_fail; |
|
} |
|
} else { |
|
/* TODO: try to extend for non-cluster uses (eg multichannel) */ |
|
cifs_dbg(VFS, "witness requested on mount but no CLUSTER capability on share\n"); |
|
rc = -EOPNOTSUPP; |
|
goto out_fail; |
|
} |
|
} else { |
|
cifs_dbg(VFS, "SMB3 or later required for witness option\n"); |
|
rc = -EOPNOTSUPP; |
|
goto out_fail; |
|
} |
|
} |
|
#endif |
|
|
|
/* If the user really knows what they are doing they can override */ |
|
if (tcon->share_flags & SMB2_SHAREFLAG_NO_CACHING) { |
|
if (ctx->cache_ro) |
|
cifs_dbg(VFS, "cache=ro requested on mount but NO_CACHING flag set on share\n"); |
|
else if (ctx->cache_rw) |
|
cifs_dbg(VFS, "cache=singleclient requested on mount but NO_CACHING flag set on share\n"); |
|
} |
|
|
|
if (ctx->no_lease) { |
|
if (ses->server->vals->protocol_id == 0) { |
|
cifs_dbg(VFS, |
|
"SMB2 or later required for nolease option\n"); |
|
rc = -EOPNOTSUPP; |
|
goto out_fail; |
|
} else |
|
tcon->no_lease = ctx->no_lease; |
|
} |
|
|
|
/* |
|
* 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 = ctx->retry; |
|
tcon->nocase = ctx->nocase; |
|
if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING) |
|
tcon->nohandlecache = ctx->nohandlecache; |
|
else |
|
tcon->nohandlecache = true; |
|
tcon->nodelete = ctx->nodelete; |
|
tcon->local_lease = ctx->local_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->ctx->wsize && new->ctx->wsize < old->ctx->wsize) |
|
return 0; |
|
|
|
if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize) |
|
return 0; |
|
|
|
if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) || |
|
!gid_eq(old->ctx->linux_gid, new->ctx->linux_gid)) |
|
return 0; |
|
|
|
if (old->ctx->file_mode != new->ctx->file_mode || |
|
old->ctx->dir_mode != new->ctx->dir_mode) |
|
return 0; |
|
|
|
if (strcmp(old->local_nls->charset, new->local_nls->charset)) |
|
return 0; |
|
|
|
if (old->ctx->acregmax != new->ctx->acregmax) |
|
return 0; |
|
if (old->ctx->acdirmax != new->ctx->acdirmax) |
|
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 smb3_fs_context *ctx; |
|
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 (IS_ERR(tlink)) { |
|
spin_unlock(&cifs_tcp_ses_lock); |
|
return rc; |
|
} |
|
tcon = tlink_tcon(tlink); |
|
ses = tcon->ses; |
|
tcp_srv = ses->server; |
|
|
|
ctx = mnt_data->ctx; |
|
|
|
if (!match_server(tcp_srv, ctx) || |
|
!match_session(ses, ctx) || |
|
!match_tcon(tcon, ctx) || |
|
!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) { |
|
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&server->dstaddr; |
|
|
|
sport = ipv6->sin6_port; |
|
slen = sizeof(struct sockaddr_in6); |
|
sfamily = AF_INET6; |
|
cifs_dbg(FYI, "%s: connecting to [%pI6]:%d\n", __func__, &ipv6->sin6_addr, |
|
ntohs(sport)); |
|
} else { |
|
struct sockaddr_in *ipv4 = (struct sockaddr_in *)&server->dstaddr; |
|
|
|
sport = ipv4->sin_port; |
|
slen = sizeof(struct sockaddr_in); |
|
sfamily = AF_INET; |
|
cifs_dbg(FYI, "%s: connecting to %pI4:%d\n", __func__, &ipv4->sin_addr, |
|
ntohs(sport)); |
|
} |
|
|
|
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) |
|
tcp_sock_set_nodelay(socket->sk); |
|
|
|
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 smb3_fs_context *ctx) |
|
{ |
|
/* |
|
* 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 (ctx && ctx->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 (ctx) |
|
tcon->unix_ext = 1; /* Unix Extensions supported */ |
|
|
|
if (!tcon->unix_ext) { |
|
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 (ctx == 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 (ctx && ctx->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 (ctx && ctx->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 (ctx == 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 cifs_sb_info *cifs_sb) |
|
{ |
|
struct smb3_fs_context *ctx = cifs_sb->ctx; |
|
|
|
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_dbg(FYI, "file mode: %04ho dir mode: %04ho\n", |
|
ctx->file_mode, ctx->dir_mode); |
|
|
|
/* this is needed for ASCII cp to Unicode converts */ |
|
if (ctx->iocharset == NULL) { |
|
/* load_nls_default cannot return null */ |
|
cifs_sb->local_nls = load_nls_default(); |
|
} else { |
|
cifs_sb->local_nls = load_nls(ctx->iocharset); |
|
if (cifs_sb->local_nls == NULL) { |
|
cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n", |
|
ctx->iocharset); |
|
return -ELIBACC; |
|
} |
|
} |
|
ctx->local_nls = cifs_sb->local_nls; |
|
|
|
smb3_update_mnt_flags(cifs_sb); |
|
|
|
if (ctx->direct_io) |
|
cifs_dbg(FYI, "mounting share using direct i/o\n"); |
|
if (ctx->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 (ctx->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 ((ctx->cifs_acl) && (ctx->dynperm)) |
|
cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n"); |
|
|
|
if (ctx->prepath) { |
|
cifs_sb->prepath = kstrdup(ctx->prepath, GFP_KERNEL); |
|
if (cifs_sb->prepath == NULL) |
|
return -ENOMEM; |
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
/* 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 smb3_fs_context *ctx, 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(ctx); |
|
if (IS_ERR(server)) { |
|
rc = PTR_ERR(server); |
|
return rc; |
|
} |
|
|
|
*nserver = server; |
|
|
|
/* get a reference to a SMB session */ |
|
ses = cifs_get_smb_ses(server, ctx); |
|
if (IS_ERR(ses)) { |
|
rc = PTR_ERR(ses); |
|
return rc; |
|
} |
|
|
|
*nses = ses; |
|
|
|
if ((ctx->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, ctx); |
|
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, ctx); |
|
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 */ |
|
} |
|
} |
|
|
|
/* |
|
* Clamp the rsize/wsize mount arguments if they are too big for the server |
|
* and set the rsize/wsize to the negotiated values if not passed in by |
|
* the user on mount |
|
*/ |
|
if ((cifs_sb->ctx->wsize == 0) || |
|
(cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx))) |
|
cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx); |
|
if ((cifs_sb->ctx->rsize == 0) || |
|
(cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx))) |
|
cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx); |
|
|
|
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 |
|
* existing connection (tcon) |
|
*/ |
|
static char * |
|
build_unc_path_to_root(const struct smb3_fs_context *ctx, |
|
const struct cifs_sb_info *cifs_sb, bool useppath) |
|
{ |
|
char *full_path, *pos; |
|
unsigned int pplen = useppath && ctx->prepath ? |
|
strlen(ctx->prepath) + 1 : 0; |
|
unsigned int unc_len = strnlen(ctx->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, ctx->UNC, unc_len); |
|
pos = full_path + unc_len; |
|
|
|
if (pplen) { |
|
*pos = CIFS_DIR_SEP(cifs_sb); |
|
memcpy(pos + 1, ctx->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->ctx->mount_options 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 smb3_fs_context *ctx, struct cifs_sb_info *cifs_sb, |
|
char *ref_path) |
|
{ |
|
int rc; |
|
struct dfs_info3_param referral = {0}; |
|
char *full_path = NULL, *mdata = NULL; |
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) |
|
return -EREMOTE; |
|
|
|
full_path = build_unc_path_to_root(ctx, cifs_sb, true); |
|
if (IS_ERR(full_path)) |
|
return PTR_ERR(full_path); |
|
|
|
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->ctx->mount_options, |
|
full_path + 1, &referral, |
|
&fake_devname); |
|
free_dfs_info_param(&referral); |
|
|
|
if (IS_ERR(mdata)) { |
|
rc = PTR_ERR(mdata); |
|
mdata = NULL; |
|
} else { |
|
/* |
|
* We can not clear out the whole structure since we |
|
* no longer have an explicit function to parse |
|
* a mount-string. Instead we need to clear out the |
|
* individual fields that are no longer valid. |
|
*/ |
|
kfree(ctx->prepath); |
|
ctx->prepath = NULL; |
|
rc = cifs_setup_volume_info(ctx, mdata, fake_devname); |
|
} |
|
kfree(fake_devname); |
|
kfree(cifs_sb->ctx->mount_options); |
|
cifs_sb->ctx->mount_options = 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 smb3_fs_context *fake_ctx, struct smb3_fs_context *ctx) |
|
{ |
|
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(ctx->UNC); |
|
ctx->UNC = new_unc; |
|
|
|
if (fake_ctx->prepath) { |
|
kfree(ctx->prepath); |
|
ctx->prepath = fake_ctx->prepath; |
|
fake_ctx->prepath = NULL; |
|
} |
|
memcpy(&ctx->dstaddr, &fake_ctx->dstaddr, sizeof(ctx->dstaddr)); |
|
|
|
return 0; |
|
} |
|
|
|
static int do_dfs_failover(const char *path, const char *full_path, struct cifs_sb_info *cifs_sb, |
|
struct smb3_fs_context *ctx, 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 = {0}; |
|
struct dfs_cache_tgt_iterator *tgt_it = NULL; |
|
struct smb3_fs_context tmp_ctx = {NULL}; |
|
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) |
|
return -EOPNOTSUPP; |
|
|
|
cifs_dbg(FYI, "%s: path=%s full_path=%s\n", __func__, path, full_path); |
|
|
|
rc = dfs_cache_noreq_find(path, NULL, &tgt_list); |
|
if (rc) |
|
return rc; |
|
/* |
|
* We use a 'tmp_ctx' here because we need pass it down to the mount_{get,put} functions to |
|
* test connection against new DFS targets. |
|
*/ |
|
rc = smb3_fs_context_dup(&tmp_ctx, ctx); |
|
if (rc) |
|
goto out; |
|
|
|
for (;;) { |
|
struct dfs_info3_param ref = {0}; |
|
char *fake_devname = NULL, *mdata = NULL; |
|
|
|
/* Get next DFS target server - if any */ |
|
rc = get_next_dfs_tgt(path, &tgt_list, &tgt_it); |
|
if (rc) |
|
break; |
|
|
|
rc = dfs_cache_get_tgt_referral(path, tgt_it, &ref); |
|
if (rc) |
|
break; |
|
|
|
cifs_dbg(FYI, "%s: old ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC, |
|
tmp_ctx.prepath); |
|
|
|
mdata = cifs_compose_mount_options(cifs_sb->ctx->mount_options, full_path + 1, &ref, |
|
&fake_devname); |
|
free_dfs_info_param(&ref); |
|
|
|
if (IS_ERR(mdata)) { |
|
rc = PTR_ERR(mdata); |
|
mdata = NULL; |
|
} else |
|
rc = cifs_setup_volume_info(&tmp_ctx, mdata, fake_devname); |
|
|
|
kfree(mdata); |
|
kfree(fake_devname); |
|
|
|
if (rc) |
|
break; |
|
|
|
cifs_dbg(FYI, "%s: new ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC, |
|
tmp_ctx.prepath); |
|
|
|
mount_put_conns(cifs_sb, *xid, *server, *ses, *tcon); |
|
rc = mount_get_conns(&tmp_ctx, cifs_sb, xid, server, ses, tcon); |
|
if (!rc || (*server && *ses)) { |
|
/* |
|
* We were able to connect to new target server. Update current context with |
|
* new target server. |
|
*/ |
|
rc = update_vol_info(tgt_it, &tmp_ctx, ctx); |
|
break; |
|
} |
|
} |
|
if (!rc) { |
|
cifs_dbg(FYI, "%s: final ctx: UNC=%s prepath=%s\n", __func__, tmp_ctx.UNC, |
|
tmp_ctx.prepath); |
|
/* |
|
* 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); |
|
} |
|
|
|
out: |
|
smb3_cleanup_fs_context_contents(&tmp_ctx); |
|
dfs_cache_free_tgts(&tgt_list); |
|
return rc; |
|
} |
|
#endif |
|
|
|
/* TODO: all callers to this are broken. We are not parsing mount_options here |
|
* we should pass a clone of the original context? |
|
*/ |
|
int |
|
cifs_setup_volume_info(struct smb3_fs_context *ctx, const char *mntopts, const char *devname) |
|
{ |
|
int rc; |
|
|
|
if (devname) { |
|
cifs_dbg(FYI, "%s: devname=%s\n", __func__, devname); |
|
rc = smb3_parse_devname(devname, ctx); |
|
if (rc) { |
|
cifs_dbg(VFS, "%s: failed to parse %s: %d\n", __func__, devname, rc); |
|
return rc; |
|
} |
|
} |
|
|
|
if (mntopts) { |
|
char *ip; |
|
|
|
rc = smb3_parse_opt(mntopts, "ip", &ip); |
|
if (rc) { |
|
cifs_dbg(VFS, "%s: failed to parse ip options: %d\n", __func__, rc); |
|
return rc; |
|
} |
|
|
|
rc = cifs_convert_address((struct sockaddr *)&ctx->dstaddr, ip, strlen(ip)); |
|
kfree(ip); |
|
if (!rc) { |
|
cifs_dbg(VFS, "%s: failed to convert ip address\n", __func__); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
if (ctx->nullauth) { |
|
cifs_dbg(FYI, "Anonymous login\n"); |
|
kfree(ctx->username); |
|
ctx->username = NULL; |
|
} else if (ctx->username) { |
|
/* BB fixme parse for domain name here */ |
|
cifs_dbg(FYI, "Username: %s\n", ctx->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; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
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 smb3_fs_context *ctx, |
|
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(ctx, 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 void set_root_ses(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses, |
|
struct cifs_ses **root_ses) |
|
{ |
|
if (ses) { |
|
spin_lock(&cifs_tcp_ses_lock); |
|
ses->ses_count++; |
|
if (ses->tcon_ipc) |
|
ses->tcon_ipc->remap = cifs_remap(cifs_sb); |
|
spin_unlock(&cifs_tcp_ses_lock); |
|
} |
|
*root_ses = ses; |
|
} |
|
|
|
static void put_root_ses(struct cifs_ses *ses) |
|
{ |
|
if (ses) |
|
cifs_put_smb_ses(ses); |
|
} |
|
|
|
/* Set up next dfs prefix path in @dfs_path */ |
|
static int next_dfs_prepath(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx, |
|
const unsigned int xid, struct TCP_Server_Info *server, |
|
struct cifs_tcon *tcon, char **dfs_path) |
|
{ |
|
char *path, *npath; |
|
int added_treename = is_tcon_dfs(tcon); |
|
int rc; |
|
|
|
path = cifs_build_path_to_root(ctx, cifs_sb, tcon, added_treename); |
|
if (!path) |
|
return -ENOMEM; |
|
|
|
rc = is_path_remote(cifs_sb, ctx, xid, server, tcon); |
|
if (rc == -EREMOTE) { |
|
struct smb3_fs_context v = {NULL}; |
|
/* if @path contains a tree name, skip it in the prefix path */ |
|
if (added_treename) { |
|
rc = smb3_parse_devname(path, &v); |
|
if (rc) |
|
goto out; |
|
npath = build_unc_path_to_root(&v, cifs_sb, true); |
|
smb3_cleanup_fs_context_contents(&v); |
|
} else { |
|
v.UNC = ctx->UNC; |
|
v.prepath = path + 1; |
|
npath = build_unc_path_to_root(&v, cifs_sb, true); |
|
} |
|
|
|
if (IS_ERR(npath)) { |
|
rc = PTR_ERR(npath); |
|
goto out; |
|
} |
|
|
|
kfree(*dfs_path); |
|
*dfs_path = npath; |
|
rc = -EREMOTE; |
|
} |
|
|
|
out: |
|
kfree(path); |
|
return rc; |
|
} |
|
|
|
/* Check if resolved targets can handle any DFS referrals */ |
|
static int is_referral_server(const char *ref_path, struct cifs_tcon *tcon, bool *ref_server) |
|
{ |
|
int rc; |
|
struct dfs_info3_param ref = {0}; |
|
|
|
if (is_tcon_dfs(tcon)) { |
|
*ref_server = true; |
|
} else { |
|
cifs_dbg(FYI, "%s: ref_path=%s\n", __func__, ref_path); |
|
|
|
rc = dfs_cache_noreq_find(ref_path, &ref, NULL); |
|
if (rc) { |
|
cifs_dbg(VFS, "%s: dfs_cache_noreq_find: failed (rc=%d)\n", __func__, rc); |
|
return rc; |
|
} |
|
cifs_dbg(FYI, "%s: ref.flags=0x%x\n", __func__, ref.flags); |
|
/* |
|
* Check if all targets are capable of handling DFS referrals as per |
|
* MS-DFSC 2.2.4 RESP_GET_DFS_REFERRAL. |
|
*/ |
|
*ref_server = !!(ref.flags & DFSREF_REFERRAL_SERVER); |
|
free_dfs_info_param(&ref); |
|
} |
|
return 0; |
|
} |
|
|
|
int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) |
|
{ |
|
int rc = 0; |
|
unsigned int xid; |
|
struct TCP_Server_Info *server = NULL; |
|
struct cifs_ses *ses = NULL, *root_ses = NULL; |
|
struct cifs_tcon *tcon = NULL; |
|
int count = 0; |
|
char *ref_path = NULL, *full_path = NULL; |
|
char *oldmnt = NULL; |
|
char *mntdata = NULL; |
|
bool ref_server = false; |
|
|
|
rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon); |
|
/* |
|
* If called with 'nodfs' mount option, then skip DFS resolving. Otherwise unconditionally |
|
* try to get an DFS referral (even cached) to determine whether it is an DFS mount. |
|
* |
|
* Skip prefix path 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. |
|
*/ |
|
if ((cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_DFS) || |
|
dfs_cache_find(xid, ses, cifs_sb->local_nls, cifs_remap(cifs_sb), ctx->UNC + 1, NULL, |
|
NULL)) { |
|
if (rc) |
|
goto error; |
|
/* Check if it is fully accessible and then mount it */ |
|
rc = is_path_remote(cifs_sb, ctx, xid, server, tcon); |
|
if (!rc) |
|
goto out; |
|
if (rc != -EREMOTE) |
|
goto error; |
|
} |
|
/* Save mount options */ |
|
mntdata = kstrndup(cifs_sb->ctx->mount_options, |
|
strlen(cifs_sb->ctx->mount_options), GFP_KERNEL); |
|
if (!mntdata) { |
|
rc = -ENOMEM; |
|
goto error; |
|
} |
|
/* Get path of DFS root */ |
|
ref_path = build_unc_path_to_root(ctx, cifs_sb, false); |
|
if (IS_ERR(ref_path)) { |
|
rc = PTR_ERR(ref_path); |
|
ref_path = NULL; |
|
goto error; |
|
} |
|
|
|
set_root_ses(cifs_sb, ses, &root_ses); |
|
do { |
|
/* Save full path of last DFS path we used to resolve final target server */ |
|
kfree(full_path); |
|
full_path = build_unc_path_to_root(ctx, cifs_sb, !!count); |
|
if (IS_ERR(full_path)) { |
|
rc = PTR_ERR(full_path); |
|
full_path = NULL; |
|
break; |
|
} |
|
/* Chase referral */ |
|
oldmnt = cifs_sb->ctx->mount_options; |
|
rc = expand_dfs_referral(xid, root_ses, ctx, cifs_sb, ref_path + 1); |
|
if (rc) |
|
break; |
|
/* Connect to new DFS target only if we were redirected */ |
|
if (oldmnt != cifs_sb->ctx->mount_options) { |
|
mount_put_conns(cifs_sb, xid, server, ses, tcon); |
|
rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon); |
|
} |
|
if (rc && !server && !ses) { |
|
/* Failed to connect. Try to connect to other targets in the referral. */ |
|
rc = do_dfs_failover(ref_path + 1, full_path, cifs_sb, ctx, root_ses, &xid, |
|
&server, &ses, &tcon); |
|
} |
|
if (rc == -EACCES || rc == -EOPNOTSUPP || !server || !ses) |
|
break; |
|
if (!tcon) |
|
continue; |
|
|
|
/* Make sure that requests go through new root servers */ |
|
rc = is_referral_server(ref_path + 1, tcon, &ref_server); |
|
if (rc) |
|
break; |
|
if (ref_server) { |
|
put_root_ses(root_ses); |
|
set_root_ses(cifs_sb, ses, &root_ses); |
|
} |
|
|
|
/* Get next dfs path and then continue chasing them if -EREMOTE */ |
|
rc = next_dfs_prepath(cifs_sb, ctx, xid, server, tcon, &ref_path); |
|
/* Prevent recursion on broken link referrals */ |
|
if (rc == -EREMOTE && ++count > MAX_NESTED_LINKS) |
|
rc = -ELOOP; |
|
} while (rc == -EREMOTE); |
|
|
|
if (rc) |
|
goto error; |
|
put_root_ses(root_ses); |
|
root_ses = NULL; |
|
kfree(ref_path); |
|
ref_path = NULL; |
|
/* |
|
* Store DFS full path in both superblock and tree connect structures. |
|
* |
|
* For DFS root mounts, the prefix path (cifs_sb->prepath) is preserved during reconnect so |
|
* only the root path is set in cifs_sb->origin_fullpath and tcon->dfs_path. And for DFS |
|
* links, the prefix path is included in both and may be changed during reconnect. See |
|
* cifs_tree_connect(). |
|
*/ |
|
cifs_sb->origin_fullpath = kstrndup(full_path, strlen(full_path), GFP_KERNEL); |
|
if (!cifs_sb->origin_fullpath) { |
|
rc = -ENOMEM; |
|
goto error; |
|
} |
|
spin_lock(&cifs_tcp_ses_lock); |
|
tcon->dfs_path = full_path; |
|
full_path = NULL; |
|
tcon->remap = cifs_remap(cifs_sb); |
|
spin_unlock(&cifs_tcp_ses_lock); |
|
|
|
/* Add original context for DFS cache to be used when refreshing referrals */ |
|
rc = dfs_cache_add_vol(mntdata, ctx, cifs_sb->origin_fullpath); |
|
if (rc) |
|
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); |
|
/* |
|
* Force the use of prefix path to support failover on DFS paths that |
|
* resolve to targets that have different prefix paths. |
|
*/ |
|
cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_USE_PREFIX_PATH; |
|
kfree(cifs_sb->prepath); |
|
cifs_sb->prepath = ctx->prepath; |
|
ctx->prepath = NULL; |
|
|
|
out: |
|
free_xid(xid); |
|
cifs_try_adding_channels(cifs_sb, ses); |
|
return mount_setup_tlink(cifs_sb, ses, tcon); |
|
|
|
error: |
|
kfree(ref_path); |
|
kfree(full_path); |
|
kfree(mntdata); |
|
kfree(cifs_sb->origin_fullpath); |
|
put_root_ses(root_ses); |
|
mount_put_conns(cifs_sb, xid, server, ses, tcon); |
|
return rc; |
|
} |
|
#else |
|
int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx) |
|
{ |
|
int rc = 0; |
|
unsigned int xid; |
|
struct cifs_ses *ses; |
|
struct cifs_tcon *tcon; |
|
struct TCP_Server_Info *server; |
|
|
|
rc = mount_get_conns(ctx, cifs_sb, &xid, &server, &ses, &tcon); |
|
if (rc) |
|
goto error; |
|
|
|
if (tcon) { |
|
rc = is_path_remote(cifs_sb, ctx, 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]; |
|
be32_add_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 *cifs_sb = container_of(p, struct cifs_sb_info, rcu); |
|
|
|
unload_nls(cifs_sb->local_nls); |
|
smb3_cleanup_fs_context(cifs_sb->ctx); |
|
kfree(cifs_sb); |
|
} |
|
|
|
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->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 = cifs_ses_server(ses); |
|
|
|
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 = cifs_ses_server(ses); |
|
|
|
if (!ses->binding) { |
|
ses->capabilities = server->capabilities; |
|
if (!linuxExtEnabled) |
|
ses->capabilities &= (~server->vals->cap_unix); |
|
|
|
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; |
|
} |
|
} |
|
|
|
cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n", |
|
server->sec_mode, server->capabilities, server->timeAdj); |
|
|
|
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 smb3_fs_context *ctx, struct cifs_ses *ses) |
|
{ |
|
ctx->sectype = ses->sectype; |
|
|
|
/* krb5 is special, since we don't need username or pw */ |
|
if (ctx->sectype == Kerberos) |
|
return 0; |
|
|
|
return cifs_set_cifscreds(ctx, 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 smb3_fs_context *ctx; |
|
|
|
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); |
|
if (ctx == NULL) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
ctx->local_nls = cifs_sb->local_nls; |
|
ctx->linux_uid = fsuid; |
|
ctx->cred_uid = fsuid; |
|
ctx->UNC = master_tcon->treeName; |
|
ctx->retry = master_tcon->retry; |
|
ctx->nocase = master_tcon->nocase; |
|
ctx->nohandlecache = master_tcon->nohandlecache; |
|
ctx->local_lease = master_tcon->local_lease; |
|
ctx->no_lease = master_tcon->no_lease; |
|
ctx->resilient = master_tcon->use_resilient; |
|
ctx->persistent = master_tcon->use_persistent; |
|
ctx->handle_timeout = master_tcon->handle_timeout; |
|
ctx->no_linux_ext = !master_tcon->unix_ext; |
|
ctx->linux_ext = master_tcon->posix_extensions; |
|
ctx->sectype = master_tcon->ses->sectype; |
|
ctx->sign = master_tcon->ses->sign; |
|
ctx->seal = master_tcon->seal; |
|
#ifdef CONFIG_CIFS_SWN_UPCALL |
|
ctx->witness = master_tcon->use_witness; |
|
#endif |
|
|
|
rc = cifs_set_vol_auth(ctx, 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, ctx); |
|
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, ctx); |
|
if (IS_ERR(tcon)) { |
|
cifs_put_smb_ses(ses); |
|
goto out; |
|
} |
|
|
|
if (cap_unix(ses)) |
|
reset_cifs_unix_caps(0, tcon, NULL, ctx); |
|
|
|
out: |
|
kfree(ctx->username); |
|
kfree_sensitive(ctx->password); |
|
kfree(ctx); |
|
|
|
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); |
|
} |
|
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL |
|
int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc) |
|
{ |
|
int rc; |
|
struct TCP_Server_Info *server = tcon->ses->server; |
|
const struct smb_version_operations *ops = server->ops; |
|
struct dfs_cache_tgt_list tl; |
|
struct dfs_cache_tgt_iterator *it = NULL; |
|
char *tree; |
|
const char *tcp_host; |
|
size_t tcp_host_len; |
|
const char *dfs_host; |
|
size_t dfs_host_len; |
|
char *share = NULL, *prefix = NULL; |
|
struct dfs_info3_param ref = {0}; |
|
bool isroot; |
|
|
|
tree = kzalloc(MAX_TREE_SIZE, GFP_KERNEL); |
|
if (!tree) |
|
return -ENOMEM; |
|
|
|
if (!tcon->dfs_path) { |
|
if (tcon->ipc) { |
|
scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", server->hostname); |
|
rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc); |
|
} else { |
|
rc = ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc); |
|
} |
|
goto out; |
|
} |
|
|
|
rc = dfs_cache_noreq_find(tcon->dfs_path + 1, &ref, &tl); |
|
if (rc) |
|
goto out; |
|
isroot = ref.server_type == DFS_TYPE_ROOT; |
|
free_dfs_info_param(&ref); |
|
|
|
extract_unc_hostname(server->hostname, &tcp_host, &tcp_host_len); |
|
|
|
for (it = dfs_cache_get_tgt_iterator(&tl); it; it = dfs_cache_get_next_tgt(&tl, it)) { |
|
bool target_match; |
|
|
|
kfree(share); |
|
kfree(prefix); |
|
share = NULL; |
|
prefix = NULL; |
|
|
|
rc = dfs_cache_get_tgt_share(tcon->dfs_path + 1, it, &share, &prefix); |
|
if (rc) { |
|
cifs_dbg(VFS, "%s: failed to parse target share %d\n", |
|
__func__, rc); |
|
continue; |
|
} |
|
|
|
extract_unc_hostname(share, &dfs_host, &dfs_host_len); |
|
|
|
if (dfs_host_len != tcp_host_len |
|
|| strncasecmp(dfs_host, tcp_host, dfs_host_len) != 0) { |
|
cifs_dbg(FYI, "%s: %.*s doesn't match %.*s\n", __func__, (int)dfs_host_len, |
|
dfs_host, (int)tcp_host_len, tcp_host); |
|
|
|
rc = match_target_ip(server, dfs_host, dfs_host_len, &target_match); |
|
if (rc) { |
|
cifs_dbg(VFS, "%s: failed to match target ip: %d\n", __func__, rc); |
|
break; |
|
} |
|
|
|
if (!target_match) { |
|
cifs_dbg(FYI, "%s: skipping target\n", __func__); |
|
continue; |
|
} |
|
} |
|
|
|
if (tcon->ipc) { |
|
scnprintf(tree, MAX_TREE_SIZE, "\\\\%s\\IPC$", share); |
|
rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc); |
|
} else { |
|
scnprintf(tree, MAX_TREE_SIZE, "\\%s", share); |
|
rc = ops->tree_connect(xid, tcon->ses, tree, tcon, nlsc); |
|
/* Only handle prefix paths of DFS link targets */ |
|
if (!rc && !isroot) { |
|
rc = update_super_prepath(tcon, prefix); |
|
break; |
|
} |
|
} |
|
if (rc == -EREMOTE) |
|
break; |
|
} |
|
|
|
kfree(share); |
|
kfree(prefix); |
|
|
|
if (!rc) { |
|
if (it) |
|
rc = dfs_cache_noreq_update_tgthint(tcon->dfs_path + 1, it); |
|
else |
|
rc = -ENOENT; |
|
} |
|
dfs_cache_free_tgts(&tl); |
|
out: |
|
kfree(tree); |
|
return rc; |
|
} |
|
#else |
|
int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc) |
|
{ |
|
const struct smb_version_operations *ops = tcon->ses->server->ops; |
|
|
|
return ops->tree_connect(xid, tcon->ses, tcon->treeName, tcon, nlsc); |
|
} |
|
#endif
|
|
|