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![Steve French](/assets/img/avatar_default.png)
If user does forced unmount ("umount -f") while files are still open on the share (as was seen in a Kubernetes example running on SMB3.1.1 mount) then we were marking the share as "TID_EXITING" in umount_begin() which caused all subsequent operations (except write) to fail ... but unfortunately when umount_begin() is called we do not know yet that there are open files or active references on the share that would prevent unmount from succeeding. Kubernetes had example when they were doing umount -f when files were open which caused the share to become unusable until the files were closed (and the umount retried). Fix this so that TID_EXITING is not set until we are about to send the tree disconnect (not at the beginning of forced umounts in umount_begin) so that if "umount -f" fails (due to open files or references) the mount is still usable. Cc: stable@vger.kernel.org Reviewed-by: Shyam Prasad N <sprasad@microsoft.com> Reviewed-by: Paulo Alcantara (SUSE) <pc@manguebit.com> Signed-off-by: Steve French <stfrench@microsoft.com>
4094 lines
109 KiB
C
4094 lines
109 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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*
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* Copyright (C) International Business Machines Corp., 2002,2011
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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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.h"
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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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#include "cifs_swn.h"
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extern mempool_t *cifs_req_poolp;
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extern bool disable_legacy_dialects;
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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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/* Drop the connection to not overload the server */
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#define NUM_STATUS_IO_TIMEOUT 5
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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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* 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;
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struct sockaddr_storage ss;
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if (!server->hostname)
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return -EINVAL;
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/* if server hostname isn't populated, there's nothing to do here */
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if (server->hostname[0] == '\0')
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return 0;
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len = strlen(server->hostname) + 3;
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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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spin_lock(&server->srv_lock);
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ss = server->dstaddr;
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spin_unlock(&server->srv_lock);
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rc = dns_resolve_server_name_to_ip(unc, (struct sockaddr *)&ss, NULL);
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kfree(unc);
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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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} else {
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spin_lock(&server->srv_lock);
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memcpy(&server->dstaddr, &ss, sizeof(server->dstaddr));
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spin_unlock(&server->srv_lock);
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rc = 0;
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}
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return rc;
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}
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static void smb2_query_server_interfaces(struct work_struct *work)
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{
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int rc;
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struct cifs_tcon *tcon = container_of(work,
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struct cifs_tcon,
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query_interfaces.work);
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/*
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* query server network interfaces, in case they change
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*/
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rc = SMB3_request_interfaces(0, tcon, false);
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if (rc) {
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cifs_dbg(FYI, "%s: failed to query server interfaces: %d\n",
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__func__, rc);
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}
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queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
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(SMB_INTERFACE_POLL_INTERVAL * HZ));
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}
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/*
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* Update the tcpStatus for the server.
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* This is used to signal the cifsd thread to call cifs_reconnect
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* ONLY cifsd thread should call cifs_reconnect. For any other
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* thread, use this function
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*
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* @server: the tcp ses for which reconnect is needed
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* @all_channels: if this needs to be done for all channels
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*/
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void
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cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
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bool all_channels)
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{
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struct TCP_Server_Info *pserver;
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struct cifs_ses *ses;
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int i;
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/* If server is a channel, select the primary channel */
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pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
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spin_lock(&pserver->srv_lock);
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if (!all_channels) {
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pserver->tcpStatus = CifsNeedReconnect;
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spin_unlock(&pserver->srv_lock);
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return;
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}
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spin_unlock(&pserver->srv_lock);
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
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spin_lock(&ses->chan_lock);
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for (i = 0; i < ses->chan_count; i++) {
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spin_lock(&ses->chans[i].server->srv_lock);
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ses->chans[i].server->tcpStatus = CifsNeedReconnect;
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spin_unlock(&ses->chans[i].server->srv_lock);
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}
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spin_unlock(&ses->chan_lock);
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}
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spin_unlock(&cifs_tcp_ses_lock);
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}
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/*
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* Mark all sessions and tcons for reconnect.
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* IMPORTANT: make sure that this gets called only from
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* cifsd thread. For any other thread, use
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* cifs_signal_cifsd_for_reconnect
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*
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* @server: the tcp ses for which reconnect is needed
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* @server needs to be previously set to CifsNeedReconnect.
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* @mark_smb_session: whether even sessions need to be marked
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*/
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void
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cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
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bool mark_smb_session)
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{
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struct TCP_Server_Info *pserver;
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struct cifs_ses *ses, *nses;
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struct cifs_tcon *tcon;
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/*
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* before reconnecting the tcp session, mark the smb session (uid) and the tid bad so they
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* are not used until reconnected.
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*/
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cifs_dbg(FYI, "%s: marking necessary sessions and tcons for reconnect\n", __func__);
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/* If server is a channel, select the primary channel */
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pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
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/* check if iface is still active */
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if (!cifs_chan_is_iface_active(ses, server))
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cifs_chan_update_iface(ses, server);
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spin_lock(&ses->chan_lock);
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if (!mark_smb_session && cifs_chan_needs_reconnect(ses, server)) {
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spin_unlock(&ses->chan_lock);
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continue;
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}
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if (mark_smb_session)
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CIFS_SET_ALL_CHANS_NEED_RECONNECT(ses);
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else
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cifs_chan_set_need_reconnect(ses, server);
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cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n",
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__func__, ses->chans_need_reconnect);
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/* If all channels need reconnect, then tcon needs reconnect */
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if (!mark_smb_session && !CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
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spin_unlock(&ses->chan_lock);
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continue;
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}
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spin_unlock(&ses->chan_lock);
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spin_lock(&ses->ses_lock);
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ses->ses_status = SES_NEED_RECON;
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spin_unlock(&ses->ses_lock);
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list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
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tcon->need_reconnect = true;
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spin_lock(&tcon->tc_lock);
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tcon->status = TID_NEED_RECON;
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spin_unlock(&tcon->tc_lock);
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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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spin_lock(&ses->tcon_ipc->tc_lock);
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ses->tcon_ipc->status = TID_NEED_RECON;
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spin_unlock(&ses->tcon_ipc->tc_lock);
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}
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}
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spin_unlock(&cifs_tcp_ses_lock);
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}
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static void
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cifs_abort_connection(struct TCP_Server_Info *server)
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{
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struct mid_q_entry *mid, *nmid;
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struct list_head retry_list;
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server->maxBuf = 0;
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server->max_read = 0;
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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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cifs_server_lock(server);
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if (server->ssocket) {
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cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", server->ssocket->state,
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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", server->ssocket->state,
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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_sensitive(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(&server->mid_lock);
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list_for_each_entry_safe(mid, nmid, &server->pending_mid_q, qhead) {
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kref_get(&mid->refcount);
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if (mid->mid_state == MID_REQUEST_SUBMITTED)
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mid->mid_state = MID_RETRY_NEEDED;
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list_move(&mid->qhead, &retry_list);
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mid->mid_flags |= MID_DELETED;
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}
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spin_unlock(&server->mid_lock);
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cifs_server_unlock(server);
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cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__);
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list_for_each_entry_safe(mid, nmid, &retry_list, qhead) {
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list_del_init(&mid->qhead);
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mid->callback(mid);
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release_mid(mid);
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}
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if (cifs_rdma_enabled(server)) {
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cifs_server_lock(server);
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smbd_destroy(server);
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cifs_server_unlock(server);
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}
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}
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static bool cifs_tcp_ses_needs_reconnect(struct TCP_Server_Info *server, int num_targets)
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{
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spin_lock(&server->srv_lock);
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server->nr_targets = num_targets;
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if (server->tcpStatus == CifsExiting) {
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/* the demux thread will exit normally next time through the loop */
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spin_unlock(&server->srv_lock);
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wake_up(&server->response_q);
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return false;
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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,
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server->hostname);
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server->tcpStatus = CifsNeedReconnect;
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spin_unlock(&server->srv_lock);
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return true;
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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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* if mark_smb_session is passed as true, unconditionally mark
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* the smb session (and tcon) for reconnect as well. This value
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* doesn't really matter for non-multichannel scenario.
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*
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*/
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static int __cifs_reconnect(struct TCP_Server_Info *server,
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bool mark_smb_session)
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{
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int rc = 0;
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if (!cifs_tcp_ses_needs_reconnect(server, 1))
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return 0;
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cifs_mark_tcp_ses_conns_for_reconnect(server, mark_smb_session);
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cifs_abort_connection(server);
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do {
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try_to_freeze();
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cifs_server_lock(server);
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if (!cifs_swn_set_server_dstaddr(server)) {
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/* resolve the hostname again to make sure that IP address is up-to-date */
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rc = reconn_set_ipaddr_from_hostname(server);
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cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
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}
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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_server_unlock(server);
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cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
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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(&server->srv_lock);
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if (server->tcpStatus != CifsExiting)
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server->tcpStatus = CifsNeedNegotiate;
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spin_unlock(&server->srv_lock);
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cifs_swn_reset_server_dstaddr(server);
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cifs_server_unlock(server);
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mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
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}
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} while (server->tcpStatus == CifsNeedReconnect);
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spin_lock(&server->srv_lock);
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if (server->tcpStatus == CifsNeedNegotiate)
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mod_delayed_work(cifsiod_wq, &server->echo, 0);
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spin_unlock(&server->srv_lock);
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wake_up(&server->response_q);
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return rc;
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}
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#ifdef CONFIG_CIFS_DFS_UPCALL
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static int __reconnect_target_unlocked(struct TCP_Server_Info *server, const char *target)
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{
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int rc;
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char *hostname;
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if (!cifs_swn_set_server_dstaddr(server)) {
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if (server->hostname != target) {
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hostname = extract_hostname(target);
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if (!IS_ERR(hostname)) {
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kfree(server->hostname);
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server->hostname = hostname;
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} else {
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cifs_dbg(FYI, "%s: couldn't extract hostname or address from dfs target: %ld\n",
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__func__, PTR_ERR(hostname));
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cifs_dbg(FYI, "%s: default to last target server: %s\n", __func__,
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server->hostname);
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}
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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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rc = reconn_set_ipaddr_from_hostname(server);
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cifs_dbg(FYI, "%s: reconn_set_ipaddr_from_hostname: rc=%d\n", __func__, rc);
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}
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/* Reconnect the socket */
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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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return rc;
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}
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static int reconnect_target_unlocked(struct TCP_Server_Info *server, struct dfs_cache_tgt_list *tl,
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struct dfs_cache_tgt_iterator **target_hint)
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{
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int rc;
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struct dfs_cache_tgt_iterator *tit;
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*target_hint = NULL;
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/* If dfs target list is empty, then reconnect to last server */
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tit = dfs_cache_get_tgt_iterator(tl);
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if (!tit)
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return __reconnect_target_unlocked(server, server->hostname);
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/* Otherwise, try every dfs target in @tl */
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for (; tit; tit = dfs_cache_get_next_tgt(tl, tit)) {
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rc = __reconnect_target_unlocked(server, dfs_cache_get_tgt_name(tit));
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if (!rc) {
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*target_hint = tit;
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break;
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}
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}
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return rc;
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}
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static int reconnect_dfs_server(struct TCP_Server_Info *server)
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{
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int rc = 0;
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const char *refpath = server->current_fullpath + 1;
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struct dfs_cache_tgt_list tl = DFS_CACHE_TGT_LIST_INIT(tl);
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struct dfs_cache_tgt_iterator *target_hint = NULL;
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int num_targets = 0;
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/*
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* Determine the number of dfs targets the referral path in @cifs_sb resolves to.
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|
*
|
|
* smb2_reconnect() needs to know how long it should wait based upon the number of dfs
|
|
* targets (server->nr_targets). It's also possible that the cached referral was cleared
|
|
* through /proc/fs/cifs/dfscache or the target list is empty due to server settings after
|
|
* refreshing the referral, so, in this case, default it to 1.
|
|
*/
|
|
if (!dfs_cache_noreq_find(refpath, NULL, &tl))
|
|
num_targets = dfs_cache_get_nr_tgts(&tl);
|
|
if (!num_targets)
|
|
num_targets = 1;
|
|
|
|
if (!cifs_tcp_ses_needs_reconnect(server, num_targets))
|
|
return 0;
|
|
|
|
/*
|
|
* Unconditionally mark all sessions & tcons for reconnect as we might be connecting to a
|
|
* different server or share during failover. It could be improved by adding some logic to
|
|
* only do that in case it connects to a different server or share, though.
|
|
*/
|
|
cifs_mark_tcp_ses_conns_for_reconnect(server, true);
|
|
|
|
cifs_abort_connection(server);
|
|
|
|
do {
|
|
try_to_freeze();
|
|
cifs_server_lock(server);
|
|
|
|
rc = reconnect_target_unlocked(server, &tl, &target_hint);
|
|
if (rc) {
|
|
/* Failed to reconnect socket */
|
|
cifs_server_unlock(server);
|
|
cifs_dbg(FYI, "%s: reconnect error %d\n", __func__, rc);
|
|
msleep(3000);
|
|
continue;
|
|
}
|
|
/*
|
|
* Socket was created. Update tcp session status to CifsNeedNegotiate so that a
|
|
* process waiting for reconnect will know it needs to re-establish session and tcon
|
|
* through the reconnected target server.
|
|
*/
|
|
atomic_inc(&tcpSesReconnectCount);
|
|
set_credits(server, 1);
|
|
spin_lock(&server->srv_lock);
|
|
if (server->tcpStatus != CifsExiting)
|
|
server->tcpStatus = CifsNeedNegotiate;
|
|
spin_unlock(&server->srv_lock);
|
|
cifs_swn_reset_server_dstaddr(server);
|
|
cifs_server_unlock(server);
|
|
mod_delayed_work(cifsiod_wq, &server->reconnect, 0);
|
|
} while (server->tcpStatus == CifsNeedReconnect);
|
|
|
|
dfs_cache_noreq_update_tgthint(refpath, target_hint);
|
|
dfs_cache_free_tgts(&tl);
|
|
|
|
/* Need to set up echo worker again once connection has been established */
|
|
spin_lock(&server->srv_lock);
|
|
if (server->tcpStatus == CifsNeedNegotiate)
|
|
mod_delayed_work(cifsiod_wq, &server->echo, 0);
|
|
spin_unlock(&server->srv_lock);
|
|
|
|
wake_up(&server->response_q);
|
|
return rc;
|
|
}
|
|
|
|
int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
|
|
{
|
|
mutex_lock(&server->refpath_lock);
|
|
if (!server->leaf_fullpath) {
|
|
mutex_unlock(&server->refpath_lock);
|
|
return __cifs_reconnect(server, mark_smb_session);
|
|
}
|
|
mutex_unlock(&server->refpath_lock);
|
|
|
|
return reconnect_dfs_server(server);
|
|
}
|
|
#else
|
|
int cifs_reconnect(struct TCP_Server_Info *server, bool mark_smb_session)
|
|
{
|
|
return __cifs_reconnect(server, mark_smb_session);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
cifs_echo_request(struct work_struct *work)
|
|
{
|
|
int rc;
|
|
struct TCP_Server_Info *server = container_of(work,
|
|
struct TCP_Server_Info, echo.work);
|
|
|
|
/*
|
|
* We cannot send an echo if it is disabled.
|
|
* Also, no need to ping if we got a response recently.
|
|
*/
|
|
|
|
if (server->tcpStatus == CifsNeedReconnect ||
|
|
server->tcpStatus == CifsExiting ||
|
|
server->tcpStatus == CifsNew ||
|
|
(server->ops->can_echo && !server->ops->can_echo(server)) ||
|
|
time_before(jiffies, server->lstrp + server->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);
|
|
|
|
/* Check witness registrations */
|
|
cifs_swn_check();
|
|
|
|
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.
|
|
*/
|
|
spin_lock(&server->srv_lock);
|
|
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)) {
|
|
spin_unlock(&server->srv_lock);
|
|
cifs_server_dbg(VFS, "has not responded in %lu seconds. Reconnecting...\n",
|
|
(3 * server->echo_interval) / HZ);
|
|
cifs_reconnect(server, false);
|
|
return true;
|
|
}
|
|
spin_unlock(&server->srv_lock);
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline bool
|
|
zero_credits(struct TCP_Server_Info *server)
|
|
{
|
|
int val;
|
|
|
|
spin_lock(&server->req_lock);
|
|
val = server->credits + server->echo_credits + server->oplock_credits;
|
|
if (server->in_flight == 0 && val == 0) {
|
|
spin_unlock(&server->req_lock);
|
|
return true;
|
|
}
|
|
spin_unlock(&server->req_lock);
|
|
return false;
|
|
}
|
|
|
|
static int
|
|
cifs_readv_from_socket(struct TCP_Server_Info *server, struct msghdr *smb_msg)
|
|
{
|
|
int length = 0;
|
|
int total_read;
|
|
|
|
for (total_read = 0; msg_data_left(smb_msg); total_read += length) {
|
|
try_to_freeze();
|
|
|
|
/* reconnect if no credits and no requests in flight */
|
|
if (zero_credits(server)) {
|
|
cifs_reconnect(server, false);
|
|
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);
|
|
|
|
spin_lock(&server->srv_lock);
|
|
if (server->tcpStatus == CifsExiting) {
|
|
spin_unlock(&server->srv_lock);
|
|
return -ESHUTDOWN;
|
|
}
|
|
|
|
if (server->tcpStatus == CifsNeedReconnect) {
|
|
spin_unlock(&server->srv_lock);
|
|
cifs_reconnect(server, false);
|
|
return -ECONNABORTED;
|
|
}
|
|
spin_unlock(&server->srv_lock);
|
|
|
|
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, false);
|
|
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, ITER_DEST, &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
|
|
*/
|
|
iov_iter_discard(&smb_msg.msg_iter, ITER_DEST, 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;
|
|
|
|
bvec_set_page(&bv, page, to_read, page_offset);
|
|
iov_iter_bvec(&smb_msg.msg_iter, ITER_DEST, &bv, 1, to_read);
|
|
return cifs_readv_from_socket(server, &smb_msg);
|
|
}
|
|
|
|
int
|
|
cifs_read_iter_from_socket(struct TCP_Server_Info *server, struct iov_iter *iter,
|
|
unsigned int to_read)
|
|
{
|
|
struct msghdr smb_msg = { .msg_iter = *iter };
|
|
int ret;
|
|
|
|
iov_iter_truncate(&smb_msg.msg_iter, to_read);
|
|
ret = cifs_readv_from_socket(server, &smb_msg);
|
|
if (ret > 0)
|
|
iov_iter_advance(iter, ret);
|
|
return ret;
|
|
}
|
|
|
|
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, true);
|
|
break;
|
|
default:
|
|
cifs_server_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type);
|
|
cifs_reconnect(server, true);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
dequeue_mid(struct mid_q_entry *mid, bool malformed)
|
|
{
|
|
#ifdef CONFIG_CIFS_STATS2
|
|
mid->when_received = jiffies;
|
|
#endif
|
|
spin_lock(&mid->server->mid_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) {
|
|
spin_unlock(&mid->server->mid_lock);
|
|
pr_warn_once("trying to dequeue a deleted mid\n");
|
|
} else {
|
|
list_del_init(&mid->qhead);
|
|
mid->mid_flags |= MID_DELETED;
|
|
spin_unlock(&mid->server->mid_lock);
|
|
}
|
|
}
|
|
|
|
static unsigned int
|
|
smb2_get_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
|
|
{
|
|
struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
|
|
|
|
/*
|
|
* SMB1 does not use credits.
|
|
*/
|
|
if (is_smb1(server))
|
|
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);
|
|
}
|
|
|
|
int
|
|
cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
|
|
{
|
|
bool srv_sign_required = server->sec_mode & server->vals->signing_required;
|
|
bool srv_sign_enabled = server->sec_mode & server->vals->signing_enabled;
|
|
bool mnt_sign_enabled;
|
|
|
|
/*
|
|
* Is signing required by mnt options? If not then check
|
|
* global_secflags to see if it is there.
|
|
*/
|
|
if (!mnt_sign_required)
|
|
mnt_sign_required = ((global_secflags & CIFSSEC_MUST_SIGN) ==
|
|
CIFSSEC_MUST_SIGN);
|
|
|
|
/*
|
|
* If signing is required then it's automatically enabled too,
|
|
* otherwise, check to see if the secflags allow it.
|
|
*/
|
|
mnt_sign_enabled = mnt_sign_required ? mnt_sign_required :
|
|
(global_secflags & CIFSSEC_MAY_SIGN);
|
|
|
|
/* If server requires signing, does client allow it? */
|
|
if (srv_sign_required) {
|
|
if (!mnt_sign_enabled) {
|
|
cifs_dbg(VFS, "Server requires signing, but it's disabled in SecurityFlags!\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
server->sign = true;
|
|
}
|
|
|
|
/* If client requires signing, does server allow it? */
|
|
if (mnt_sign_required) {
|
|
if (!srv_sign_enabled) {
|
|
cifs_dbg(VFS, "Server does not support signing!\n");
|
|
return -EOPNOTSUPP;
|
|
}
|
|
server->sign = true;
|
|
}
|
|
|
|
if (cifs_rdma_enabled(server) && server->sign)
|
|
cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void clean_demultiplex_info(struct TCP_Server_Info *server)
|
|
{
|
|
int length;
|
|
|
|
/* take it off the list, if it's not already */
|
|
spin_lock(&server->srv_lock);
|
|
list_del_init(&server->tcp_ses_list);
|
|
spin_unlock(&server->srv_lock);
|
|
|
|
cancel_delayed_work_sync(&server->echo);
|
|
|
|
spin_lock(&server->srv_lock);
|
|
server->tcpStatus = CifsExiting;
|
|
spin_unlock(&server->srv_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(&server->mid_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(&server->mid_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);
|
|
release_mid(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.
|
|
*/
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
kfree(server->origin_fullpath);
|
|
kfree(server->leaf_fullpath);
|
|
#endif
|
|
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) -
|
|
HEADER_PREAMBLE_SIZE(server)) {
|
|
cifs_server_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length);
|
|
cifs_reconnect(server, true);
|
|
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 - MID_HEADER_SIZE(server));
|
|
|
|
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 rc;
|
|
|
|
/*
|
|
* 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.
|
|
*
|
|
* 48 bytes is enough to display the header and a little bit
|
|
* into the payload for debugging purposes.
|
|
*/
|
|
rc = server->ops->check_message(buf, server->total_read, server);
|
|
if (rc)
|
|
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, true);
|
|
return -1;
|
|
}
|
|
|
|
if (server->ops->is_status_pending &&
|
|
server->ops->is_status_pending(buf, server))
|
|
return -1;
|
|
|
|
if (!mid)
|
|
return rc;
|
|
|
|
handle_mid(mid, server, buf, rc);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
smb2_add_credits_from_hdr(char *buffer, struct TCP_Server_Info *server)
|
|
{
|
|
struct smb2_hdr *shdr = (struct smb2_hdr *)buffer;
|
|
int scredits, in_flight;
|
|
|
|
/*
|
|
* SMB1 does not use credits.
|
|
*/
|
|
if (is_smb1(server))
|
|
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_hdr_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 (is_smb1(server))
|
|
server->total_read = length;
|
|
else
|
|
server->total_read = 0;
|
|
|
|
/*
|
|
* 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 < MID_HEADER_SIZE(server)) {
|
|
cifs_server_dbg(VFS, "SMB response too short (%u bytes)\n",
|
|
server->pdu_size);
|
|
cifs_reconnect(server, true);
|
|
continue;
|
|
}
|
|
|
|
/* read down to the MID */
|
|
length = cifs_read_from_socket(server,
|
|
buf + HEADER_PREAMBLE_SIZE(server),
|
|
MID_HEADER_SIZE(server));
|
|
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])
|
|
release_mid(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, false);
|
|
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]);
|
|
|
|
release_mid(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(&mid_count));
|
|
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_kthread_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)
|
|
&& saddr6->sin6_scope_id == vaddr6->sin6_scope_id);
|
|
}
|
|
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_server_address(struct TCP_Server_Info *server, struct sockaddr *addr)
|
|
{
|
|
if (!cifs_match_ipaddr(addr, (struct sockaddr *)&server->dstaddr))
|
|
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 bool dfs_src_pathname_equal(const char *s1, const char *s2)
|
|
{
|
|
if (strlen(s1) != strlen(s2))
|
|
return false;
|
|
for (; *s1; s1++, s2++) {
|
|
if (*s1 == '/' || *s1 == '\\') {
|
|
if (*s2 != '/' && *s2 != '\\')
|
|
return false;
|
|
} else if (tolower(*s1) != tolower(*s2))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/* this function must be called with srv_lock held */
|
|
static int match_server(struct TCP_Server_Info *server, struct smb3_fs_context *ctx,
|
|
bool dfs_super_cmp)
|
|
{
|
|
struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
|
|
|
|
if (ctx->nosharesock)
|
|
return 0;
|
|
|
|
/* this server does not share socket */
|
|
if (server->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 (!cifs_match_ipaddr((struct sockaddr *)&ctx->srcaddr,
|
|
(struct sockaddr *)&server->srcaddr))
|
|
return 0;
|
|
/*
|
|
* When matching DFS superblocks, we only check for original source pathname as the
|
|
* currently connected target might be different than the one parsed earlier in i.e.
|
|
* mount.cifs(8).
|
|
*/
|
|
if (dfs_super_cmp) {
|
|
if (!ctx->source || !server->origin_fullpath ||
|
|
!dfs_src_pathname_equal(server->origin_fullpath, ctx->source))
|
|
return 0;
|
|
} else {
|
|
/* Skip addr, hostname and port matching for DFS connections */
|
|
if (server->leaf_fullpath) {
|
|
if (!ctx->leaf_fullpath ||
|
|
strcasecmp(server->leaf_fullpath, ctx->leaf_fullpath))
|
|
return 0;
|
|
} else if (strcasecmp(server->hostname, ctx->server_hostname) ||
|
|
!match_server_address(server, addr) ||
|
|
!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) {
|
|
spin_lock(&server->srv_lock);
|
|
/*
|
|
* Skip ses channels since they're only handled in lower layers
|
|
* (e.g. cifs_send_recv).
|
|
*/
|
|
if (CIFS_SERVER_IS_CHAN(server) || !match_server(server, ctx, false)) {
|
|
spin_unlock(&server->srv_lock);
|
|
continue;
|
|
}
|
|
spin_unlock(&server->srv_lock);
|
|
|
|
++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;
|
|
}
|
|
|
|
/* srv_count can never go negative */
|
|
WARN_ON(server->srv_count < 0);
|
|
|
|
put_net(cifs_net_ns(server));
|
|
|
|
list_del_init(&server->tcp_ses_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
/* For secondary channels, we pick up ref-count on the primary server */
|
|
if (CIFS_SERVER_IS_CHAN(server))
|
|
cifs_put_tcp_session(server->primary_server, from_reconnect);
|
|
|
|
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(&server->srv_lock);
|
|
server->tcpStatus = CifsExiting;
|
|
spin_unlock(&server->srv_lock);
|
|
|
|
cifs_crypto_secmech_release(server);
|
|
|
|
kfree_sensitive(server->session_key.response);
|
|
server->session_key.response = NULL;
|
|
server->session_key.len = 0;
|
|
kfree(server->hostname);
|
|
server->hostname = NULL;
|
|
|
|
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 *primary_server)
|
|
{
|
|
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->hostname = kstrdup(ctx->server_hostname, GFP_KERNEL);
|
|
if (!tcp_ses->hostname) {
|
|
rc = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
|
|
if (ctx->leaf_fullpath) {
|
|
tcp_ses->leaf_fullpath = kstrdup(ctx->leaf_fullpath, GFP_KERNEL);
|
|
if (!tcp_ses->leaf_fullpath) {
|
|
rc = -ENOMEM;
|
|
goto out_err;
|
|
}
|
|
tcp_ses->current_fullpath = tcp_ses->leaf_fullpath;
|
|
}
|
|
|
|
if (ctx->nosharesock)
|
|
tcp_ses->nosharesock = true;
|
|
|
|
tcp_ses->ops = ctx->ops;
|
|
tcp_ses->vals = ctx->vals;
|
|
cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));
|
|
|
|
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;
|
|
if (primary_server) {
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
++primary_server->srv_count;
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
tcp_ses->primary_server = primary_server;
|
|
}
|
|
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);
|
|
spin_lock_init(&tcp_ses->srv_lock);
|
|
spin_lock_init(&tcp_ses->mid_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);
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
mutex_init(&tcp_ses->refpath_lock);
|
|
#endif
|
|
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;
|
|
/*
|
|
* 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 update of tcpStatus
|
|
*/
|
|
spin_lock(&tcp_ses->srv_lock);
|
|
tcp_ses->tcpStatus = CifsNeedNegotiate;
|
|
spin_unlock(&tcp_ses->srv_lock);
|
|
|
|
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);
|
|
|
|
/* 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 (CIFS_SERVER_IS_CHAN(tcp_ses))
|
|
cifs_put_tcp_session(tcp_ses->primary_server, false);
|
|
kfree(tcp_ses->hostname);
|
|
kfree(tcp_ses->leaf_fullpath);
|
|
if (tcp_ses->ssocket)
|
|
sock_release(tcp_ses->ssocket);
|
|
kfree(tcp_ses);
|
|
}
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
/* this function must be called with ses_lock and chan_lock held */
|
|
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
|
|
* @ses: smb session to issue the request on
|
|
* @ctx: the superblock configuration context to use for building the
|
|
* new tree connection for the IPC (interprocess communication RPC)
|
|
*
|
|
* 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=0x%x\n", rc, tcon->tid);
|
|
|
|
spin_lock(&tcon->tc_lock);
|
|
tcon->status = TID_GOOD;
|
|
spin_unlock(&tcon->tc_lock);
|
|
ses->tcon_ipc = tcon;
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* cifs_free_ipc - helper to release the session IPC tcon
|
|
* @ses: smb session to unmount the IPC from
|
|
*
|
|
* Needs to be called everytime a session is destroyed.
|
|
*
|
|
* On session close, the IPC is closed and the server must release all tcons of the session.
|
|
* No need to send a tree disconnect here.
|
|
*
|
|
* Besides, it will make the server to not close durable and resilient files on session close, as
|
|
* specified in MS-SMB2 3.3.5.6 Receiving an SMB2 LOGOFF Request.
|
|
*/
|
|
static int
|
|
cifs_free_ipc(struct cifs_ses *ses)
|
|
{
|
|
struct cifs_tcon *tcon = ses->tcon_ipc;
|
|
|
|
if (tcon == NULL)
|
|
return 0;
|
|
|
|
tconInfoFree(tcon);
|
|
ses->tcon_ipc = NULL;
|
|
return 0;
|
|
}
|
|
|
|
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) {
|
|
spin_lock(&ses->ses_lock);
|
|
if (ses->ses_status == SES_EXITING) {
|
|
spin_unlock(&ses->ses_lock);
|
|
continue;
|
|
}
|
|
spin_lock(&ses->chan_lock);
|
|
if (!match_session(ses, ctx)) {
|
|
spin_unlock(&ses->chan_lock);
|
|
spin_unlock(&ses->ses_lock);
|
|
continue;
|
|
}
|
|
spin_unlock(&ses->chan_lock);
|
|
spin_unlock(&ses->ses_lock);
|
|
|
|
++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;
|
|
unsigned int chan_count;
|
|
struct TCP_Server_Info *server = ses->server;
|
|
|
|
spin_lock(&ses->ses_lock);
|
|
if (ses->ses_status == SES_EXITING) {
|
|
spin_unlock(&ses->ses_lock);
|
|
return;
|
|
}
|
|
spin_unlock(&ses->ses_lock);
|
|
|
|
cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count);
|
|
cifs_dbg(FYI,
|
|
"%s: ses ipc: %s\n", __func__, ses->tcon_ipc ? ses->tcon_ipc->tree_name : "NONE");
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if (--ses->ses_count > 0) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return;
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
/* ses_count can never go negative */
|
|
WARN_ON(ses->ses_count < 0);
|
|
|
|
if (ses->ses_status == SES_GOOD)
|
|
ses->ses_status = SES_EXITING;
|
|
|
|
cifs_free_ipc(ses);
|
|
|
|
if (ses->ses_status == SES_EXITING && 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);
|
|
|
|
chan_count = ses->chan_count;
|
|
|
|
/* close any extra channels */
|
|
if (chan_count > 1) {
|
|
int i;
|
|
|
|
for (i = 1; i < chan_count; i++) {
|
|
if (ses->chans[i].iface) {
|
|
kref_put(&ses->chans[i].iface->refcount, release_iface);
|
|
ses->chans[i].iface = NULL;
|
|
}
|
|
cifs_put_tcp_session(ses->chans[i].server, 0);
|
|
ses->chans[i].server = NULL;
|
|
}
|
|
}
|
|
|
|
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 = kstrdup(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;
|
|
}
|
|
}
|
|
|
|
strscpy(ctx->workstation_name, ses->workstation_name, sizeof(ctx->workstation_name));
|
|
|
|
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
|
|
* @server: server to setup the session to
|
|
* @ctx: superblock configuration context to use to setup the session
|
|
*
|
|
* 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 = 0;
|
|
unsigned int xid;
|
|
struct cifs_ses *ses;
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr;
|
|
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr;
|
|
|
|
xid = get_xid();
|
|
|
|
ses = cifs_find_smb_ses(server, ctx);
|
|
if (ses) {
|
|
cifs_dbg(FYI, "Existing smb sess found (status=%d)\n",
|
|
ses->ses_status);
|
|
|
|
spin_lock(&ses->chan_lock);
|
|
if (cifs_chan_needs_reconnect(ses, server)) {
|
|
spin_unlock(&ses->chan_lock);
|
|
cifs_dbg(FYI, "Session needs reconnect\n");
|
|
|
|
mutex_lock(&ses->session_mutex);
|
|
rc = cifs_negotiate_protocol(xid, ses, server);
|
|
if (rc) {
|
|
mutex_unlock(&ses->session_mutex);
|
|
/* problem -- put our ses reference */
|
|
cifs_put_smb_ses(ses);
|
|
free_xid(xid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
rc = cifs_setup_session(xid, ses, server,
|
|
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);
|
|
|
|
spin_lock(&ses->chan_lock);
|
|
}
|
|
spin_unlock(&ses->chan_lock);
|
|
|
|
/* existing SMB ses has a server reference already */
|
|
cifs_put_tcp_session(server, 0);
|
|
free_xid(xid);
|
|
return ses;
|
|
}
|
|
|
|
rc = -ENOMEM;
|
|
|
|
cifs_dbg(FYI, "Existing smb sess not found\n");
|
|
ses = sesInfoAlloc();
|
|
if (ses == NULL)
|
|
goto get_ses_fail;
|
|
|
|
/* new SMB session uses our server ref */
|
|
ses->server = server;
|
|
if (server->dstaddr.ss_family == AF_INET6)
|
|
sprintf(ses->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;
|
|
}
|
|
|
|
strscpy(ses->workstation_name, ctx->workstation_name, sizeof(ses->workstation_name));
|
|
|
|
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;
|
|
|
|
/* add server as first channel */
|
|
spin_lock(&ses->chan_lock);
|
|
ses->chans[0].server = server;
|
|
ses->chan_count = 1;
|
|
ses->chan_max = ctx->multichannel ? ctx->max_channels:1;
|
|
ses->chans_need_reconnect = 1;
|
|
spin_unlock(&ses->chan_lock);
|
|
|
|
mutex_lock(&ses->session_mutex);
|
|
rc = cifs_negotiate_protocol(xid, ses, server);
|
|
if (!rc)
|
|
rc = cifs_setup_session(xid, ses, server, ctx->local_nls);
|
|
mutex_unlock(&ses->session_mutex);
|
|
|
|
/* each channel uses a different signing key */
|
|
spin_lock(&ses->chan_lock);
|
|
memcpy(ses->chans[0].signkey, ses->smb3signingkey,
|
|
sizeof(ses->smb3signingkey));
|
|
spin_unlock(&ses->chan_lock);
|
|
|
|
if (rc)
|
|
goto get_ses_fail;
|
|
|
|
/*
|
|
* success, put it on the list and add it as first channel
|
|
* note: the session becomes active soon after this. So you'll
|
|
* need to lock before changing something in the session.
|
|
*/
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
ses->dfs_root_ses = ctx->dfs_root_ses;
|
|
list_add(&ses->smb_ses_list, &server->smb_ses_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
cifs_setup_ipc(ses, ctx);
|
|
|
|
free_xid(xid);
|
|
|
|
return ses;
|
|
|
|
get_ses_fail:
|
|
sesInfoFree(ses);
|
|
free_xid(xid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
/* this function must be called with tc_lock held */
|
|
static int match_tcon(struct cifs_tcon *tcon, struct smb3_fs_context *ctx, bool dfs_super_cmp)
|
|
{
|
|
if (tcon->status == TID_EXITING)
|
|
return 0;
|
|
/* Skip UNC validation when matching DFS superblocks */
|
|
if (!dfs_super_cmp && strncmp(tcon->tree_name, 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 cifs_tcon *tcon;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
|
|
spin_lock(&tcon->tc_lock);
|
|
if (!match_tcon(tcon, ctx, false)) {
|
|
spin_unlock(&tcon->tc_lock);
|
|
continue;
|
|
}
|
|
++tcon->tc_count;
|
|
spin_unlock(&tcon->tc_lock);
|
|
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);
|
|
spin_lock(&tcon->tc_lock);
|
|
if (--tcon->tc_count > 0) {
|
|
spin_unlock(&tcon->tc_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return;
|
|
}
|
|
|
|
/* tc_count can never go negative */
|
|
WARN_ON(tcon->tc_count < 0);
|
|
|
|
list_del_init(&tcon->tcon_list);
|
|
tcon->status = TID_EXITING;
|
|
spin_unlock(&tcon->tc_lock);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
/* cancel polling of interfaces */
|
|
cancel_delayed_work_sync(&tcon->query_interfaces);
|
|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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
|
|
* @ses: smb session to issue the request on
|
|
* @ctx: the superblock configuration context to use for building the
|
|
*
|
|
* - 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 if ((ses->server->vals->protocol_id == SMB311_PROT_ID) ||
|
|
(strcmp(ses->server->vals->version_string,
|
|
SMB3ANY_VERSION_STRING) == 0) ||
|
|
(strcmp(ses->server->vals->version_string,
|
|
SMBDEFAULT_VERSION_STRING) == 0)) {
|
|
cifs_dbg(VFS, "Server does not support mounting with posix SMB3.11 extensions\n");
|
|
rc = -EOPNOTSUPP;
|
|
goto out_fail;
|
|
} else {
|
|
cifs_dbg(VFS, "Check vers= mount option. SMB3.11 "
|
|
"disabled but required for POSIX extensions\n");
|
|
rc = -EOPNOTSUPP;
|
|
goto out_fail;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
tcon->use_witness = false;
|
|
if (IS_ENABLED(CONFIG_CIFS_SWN_UPCALL) && 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;
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
tcon->broken_sparse_sup = ctx->no_sparse;
|
|
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);
|
|
tcon->status = TID_GOOD;
|
|
|
|
INIT_DELAYED_WORK(&tcon->query_interfaces,
|
|
smb2_query_server_interfaces);
|
|
if (ses->server->dialect >= SMB30_PROT_ID &&
|
|
(ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
|
|
/* schedule query interfaces poll */
|
|
queue_delayed_work(cifsiod_wq, &tcon->query_interfaces,
|
|
(SMB_INTERFACE_POLL_INTERVAL * HZ));
|
|
}
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
list_add(&tcon->tcon_list, &ses->tcon_list);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
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;
|
|
if (old->ctx->closetimeo != new->ctx->closetimeo)
|
|
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 = 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;
|
|
bool dfs_super_cmp;
|
|
int rc = 0;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
cifs_sb = CIFS_SB(sb);
|
|
tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb));
|
|
if (tlink == NULL) {
|
|
/* can not match superblock if tlink were ever null */
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return 0;
|
|
}
|
|
tcon = tlink_tcon(tlink);
|
|
ses = tcon->ses;
|
|
tcp_srv = ses->server;
|
|
|
|
dfs_super_cmp = IS_ENABLED(CONFIG_CIFS_DFS_UPCALL) && tcp_srv->origin_fullpath;
|
|
|
|
ctx = mnt_data->ctx;
|
|
|
|
spin_lock(&tcp_srv->srv_lock);
|
|
spin_lock(&ses->ses_lock);
|
|
spin_lock(&ses->chan_lock);
|
|
spin_lock(&tcon->tc_lock);
|
|
if (!match_server(tcp_srv, ctx, dfs_super_cmp) ||
|
|
!match_session(ses, ctx) ||
|
|
!match_tcon(tcon, ctx, dfs_super_cmp) ||
|
|
!match_prepath(sb, mnt_data)) {
|
|
rc = 0;
|
|
goto out;
|
|
}
|
|
|
|
rc = compare_mount_options(sb, mnt_data);
|
|
out:
|
|
spin_unlock(&tcon->tc_lock);
|
|
spin_unlock(&ses->chan_lock);
|
|
spin_unlock(&ses->ses_lock);
|
|
spin_unlock(&tcp_srv->srv_lock);
|
|
|
|
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 req = {};
|
|
struct smb_hdr *smb_buf = (struct smb_hdr *)&req;
|
|
unsigned int len;
|
|
|
|
req.trailer.session_req.called_len = sizeof(req.trailer.session_req.called_name);
|
|
|
|
if (server->server_RFC1001_name[0] != 0)
|
|
rfc1002mangle(req.trailer.session_req.called_name,
|
|
server->server_RFC1001_name,
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
else
|
|
rfc1002mangle(req.trailer.session_req.called_name,
|
|
DEFAULT_CIFS_CALLED_NAME,
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
|
|
req.trailer.session_req.calling_len = sizeof(req.trailer.session_req.calling_name);
|
|
|
|
/* calling name ends in null (byte 16) from old smb convention */
|
|
if (server->workstation_RFC1001_name[0] != 0)
|
|
rfc1002mangle(req.trailer.session_req.calling_name,
|
|
server->workstation_RFC1001_name,
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
else
|
|
rfc1002mangle(req.trailer.session_req.calling_name,
|
|
"LINUX_CIFS_CLNT",
|
|
RFC1001_NAME_LEN_WITH_NULL);
|
|
|
|
/*
|
|
* As per rfc1002, @len must be the number of bytes that follows the
|
|
* length field of a rfc1002 session request payload.
|
|
*/
|
|
len = sizeof(req) - offsetof(struct rfc1002_session_packet, trailer.session_req);
|
|
|
|
smb_buf->smb_buf_length = cpu_to_be32((RFC1002_SESSION_REQUEST << 24) | len);
|
|
rc = smb_send(server, smb_buf, len);
|
|
/*
|
|
* 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);
|
|
|
|
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;
|
|
socket->sk->sk_use_task_frag = false;
|
|
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);
|
|
trace_smb3_connect_err(server->hostname, server->conn_id, &server->dstaddr, rc);
|
|
sock_release(socket);
|
|
server->ssocket = NULL;
|
|
return rc;
|
|
}
|
|
trace_smb3_connect_done(server->hostname, server->conn_id, &server->dstaddr);
|
|
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);
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
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");
|
|
|
|
}
|
|
}
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
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 */
|
|
void cifs_mount_put_conns(struct cifs_mount_ctx *mnt_ctx)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (mnt_ctx->tcon)
|
|
cifs_put_tcon(mnt_ctx->tcon);
|
|
else if (mnt_ctx->ses)
|
|
cifs_put_smb_ses(mnt_ctx->ses);
|
|
else if (mnt_ctx->server)
|
|
cifs_put_tcp_session(mnt_ctx->server, 0);
|
|
mnt_ctx->cifs_sb->mnt_cifs_flags &= ~CIFS_MOUNT_POSIX_PATHS;
|
|
free_xid(mnt_ctx->xid);
|
|
}
|
|
|
|
int cifs_mount_get_session(struct cifs_mount_ctx *mnt_ctx)
|
|
{
|
|
struct TCP_Server_Info *server = NULL;
|
|
struct smb3_fs_context *ctx;
|
|
struct cifs_ses *ses = NULL;
|
|
unsigned int xid;
|
|
int rc = 0;
|
|
|
|
xid = get_xid();
|
|
|
|
if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->fs_ctx)) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
ctx = mnt_ctx->fs_ctx;
|
|
|
|
/* get a reference to a tcp session */
|
|
server = cifs_get_tcp_session(ctx, NULL);
|
|
if (IS_ERR(server)) {
|
|
rc = PTR_ERR(server);
|
|
server = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/* get a reference to a SMB session */
|
|
ses = cifs_get_smb_ses(server, ctx);
|
|
if (IS_ERR(ses)) {
|
|
rc = PTR_ERR(ses);
|
|
ses = NULL;
|
|
goto out;
|
|
}
|
|
|
|
if ((ctx->persistent == true) && (!(ses->server->capabilities &
|
|
SMB2_GLOBAL_CAP_PERSISTENT_HANDLES))) {
|
|
cifs_server_dbg(VFS, "persistent handles not supported by server\n");
|
|
rc = -EOPNOTSUPP;
|
|
}
|
|
|
|
out:
|
|
mnt_ctx->xid = xid;
|
|
mnt_ctx->server = server;
|
|
mnt_ctx->ses = ses;
|
|
mnt_ctx->tcon = NULL;
|
|
|
|
return rc;
|
|
}
|
|
|
|
int cifs_mount_get_tcon(struct cifs_mount_ctx *mnt_ctx)
|
|
{
|
|
struct TCP_Server_Info *server;
|
|
struct cifs_sb_info *cifs_sb;
|
|
struct smb3_fs_context *ctx;
|
|
struct cifs_tcon *tcon = NULL;
|
|
int rc = 0;
|
|
|
|
if (WARN_ON_ONCE(!mnt_ctx || !mnt_ctx->server || !mnt_ctx->ses || !mnt_ctx->fs_ctx ||
|
|
!mnt_ctx->cifs_sb)) {
|
|
rc = -EINVAL;
|
|
goto out;
|
|
}
|
|
server = mnt_ctx->server;
|
|
ctx = mnt_ctx->fs_ctx;
|
|
cifs_sb = mnt_ctx->cifs_sb;
|
|
|
|
/* search for existing tcon to this server share */
|
|
tcon = cifs_get_tcon(mnt_ctx->ses, ctx);
|
|
if (IS_ERR(tcon)) {
|
|
rc = PTR_ERR(tcon);
|
|
tcon = NULL;
|
|
goto out;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
/* 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(mnt_ctx->xid, tcon, cifs_sb, ctx);
|
|
spin_lock(&tcon->ses->server->srv_lock);
|
|
if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) &&
|
|
(le64_to_cpu(tcon->fsUnixInfo.Capability) &
|
|
CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) {
|
|
spin_unlock(&tcon->ses->server->srv_lock);
|
|
rc = -EACCES;
|
|
goto out;
|
|
}
|
|
spin_unlock(&tcon->ses->server->srv_lock);
|
|
} else
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
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(mnt_ctx->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);
|
|
|
|
/*
|
|
* The cookie is initialized from volume info returned above.
|
|
* Inside cifs_fscache_get_super_cookie it checks
|
|
* that we do not get super cookie twice.
|
|
*/
|
|
if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_FSCACHE)
|
|
cifs_fscache_get_super_cookie(tcon);
|
|
|
|
out:
|
|
mnt_ctx->tcon = tcon;
|
|
return rc;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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 (i.e. a DFS share).
|
|
*
|
|
* Return -EREMOTE if it is, otherwise 0 or -errno.
|
|
*/
|
|
int cifs_is_path_remote(struct cifs_mount_ctx *mnt_ctx)
|
|
{
|
|
int rc;
|
|
struct cifs_sb_info *cifs_sb = mnt_ctx->cifs_sb;
|
|
struct TCP_Server_Info *server = mnt_ctx->server;
|
|
unsigned int xid = mnt_ctx->xid;
|
|
struct cifs_tcon *tcon = mnt_ctx->tcon;
|
|
struct smb3_fs_context *ctx = mnt_ctx->fs_ctx;
|
|
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)
|
|
goto out;
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
out:
|
|
kfree(full_path);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_DFS_UPCALL
|
|
int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
|
|
{
|
|
struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
|
|
bool isdfs;
|
|
int rc;
|
|
|
|
INIT_LIST_HEAD(&mnt_ctx.dfs_ses_list);
|
|
|
|
rc = dfs_mount_share(&mnt_ctx, &isdfs);
|
|
if (rc)
|
|
goto error;
|
|
if (!isdfs)
|
|
goto out;
|
|
|
|
/*
|
|
* 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:
|
|
cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
|
|
rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
|
|
if (rc)
|
|
goto error;
|
|
|
|
free_xid(mnt_ctx.xid);
|
|
return rc;
|
|
|
|
error:
|
|
dfs_put_root_smb_sessions(&mnt_ctx.dfs_ses_list);
|
|
kfree(mnt_ctx.origin_fullpath);
|
|
kfree(mnt_ctx.leaf_fullpath);
|
|
cifs_mount_put_conns(&mnt_ctx);
|
|
return rc;
|
|
}
|
|
#else
|
|
int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
|
|
{
|
|
int rc = 0;
|
|
struct cifs_mount_ctx mnt_ctx = { .cifs_sb = cifs_sb, .fs_ctx = ctx, };
|
|
|
|
rc = cifs_mount_get_session(&mnt_ctx);
|
|
if (rc)
|
|
goto error;
|
|
|
|
rc = cifs_mount_get_tcon(&mnt_ctx);
|
|
if (rc)
|
|
goto error;
|
|
|
|
rc = cifs_is_path_remote(&mnt_ctx);
|
|
if (rc == -EREMOTE)
|
|
rc = -EOPNOTSUPP;
|
|
if (rc)
|
|
goto error;
|
|
|
|
rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
|
|
if (rc)
|
|
goto error;
|
|
|
|
free_xid(mnt_ctx.xid);
|
|
return rc;
|
|
|
|
error:
|
|
cifs_mount_put_conns(&mnt_ctx);
|
|
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];
|
|
|
|
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 */
|
|
|
|
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->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);
|
|
strscpy(tcon->tree_name, tree, sizeof(tcon->tree_name));
|
|
|
|
/* 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);
|
|
call_rcu(&cifs_sb->rcu, delayed_free);
|
|
}
|
|
|
|
int
|
|
cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (!server->ops->need_neg || !server->ops->negotiate)
|
|
return -ENOSYS;
|
|
|
|
/* only send once per connect */
|
|
spin_lock(&server->srv_lock);
|
|
if (server->tcpStatus != CifsGood &&
|
|
server->tcpStatus != CifsNew &&
|
|
server->tcpStatus != CifsNeedNegotiate) {
|
|
spin_unlock(&server->srv_lock);
|
|
return -EHOSTDOWN;
|
|
}
|
|
|
|
if (!server->ops->need_neg(server) &&
|
|
server->tcpStatus == CifsGood) {
|
|
spin_unlock(&server->srv_lock);
|
|
return 0;
|
|
}
|
|
|
|
server->tcpStatus = CifsInNegotiate;
|
|
spin_unlock(&server->srv_lock);
|
|
|
|
rc = server->ops->negotiate(xid, ses, server);
|
|
if (rc == 0) {
|
|
spin_lock(&server->srv_lock);
|
|
if (server->tcpStatus == CifsInNegotiate)
|
|
server->tcpStatus = CifsGood;
|
|
else
|
|
rc = -EHOSTDOWN;
|
|
spin_unlock(&server->srv_lock);
|
|
} else {
|
|
spin_lock(&server->srv_lock);
|
|
if (server->tcpStatus == CifsInNegotiate)
|
|
server->tcpStatus = CifsNeedNegotiate;
|
|
spin_unlock(&server->srv_lock);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server,
|
|
struct nls_table *nls_info)
|
|
{
|
|
int rc = -ENOSYS;
|
|
struct TCP_Server_Info *pserver = CIFS_SERVER_IS_CHAN(server) ? server->primary_server : server;
|
|
struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&pserver->dstaddr;
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)&pserver->dstaddr;
|
|
bool is_binding = false;
|
|
|
|
spin_lock(&ses->ses_lock);
|
|
cifs_dbg(FYI, "%s: channel connect bitmap: 0x%lx\n",
|
|
__func__, ses->chans_need_reconnect);
|
|
|
|
if (ses->ses_status != SES_GOOD &&
|
|
ses->ses_status != SES_NEW &&
|
|
ses->ses_status != SES_NEED_RECON) {
|
|
spin_unlock(&ses->ses_lock);
|
|
return -EHOSTDOWN;
|
|
}
|
|
|
|
/* only send once per connect */
|
|
spin_lock(&ses->chan_lock);
|
|
if (CIFS_ALL_CHANS_GOOD(ses)) {
|
|
if (ses->ses_status == SES_NEED_RECON)
|
|
ses->ses_status = SES_GOOD;
|
|
spin_unlock(&ses->chan_lock);
|
|
spin_unlock(&ses->ses_lock);
|
|
return 0;
|
|
}
|
|
|
|
cifs_chan_set_in_reconnect(ses, server);
|
|
is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
|
|
spin_unlock(&ses->chan_lock);
|
|
|
|
if (!is_binding)
|
|
ses->ses_status = SES_IN_SETUP;
|
|
spin_unlock(&ses->ses_lock);
|
|
|
|
/* update ses ip_addr only for primary chan */
|
|
if (server == pserver) {
|
|
if (server->dstaddr.ss_family == AF_INET6)
|
|
scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI6", &addr6->sin6_addr);
|
|
else
|
|
scnprintf(ses->ip_addr, sizeof(ses->ip_addr), "%pI4", &addr->sin_addr);
|
|
}
|
|
|
|
if (!is_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_sensitive(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, server, nls_info);
|
|
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "Send error in SessSetup = %d\n", rc);
|
|
spin_lock(&ses->ses_lock);
|
|
if (ses->ses_status == SES_IN_SETUP)
|
|
ses->ses_status = SES_NEED_RECON;
|
|
spin_lock(&ses->chan_lock);
|
|
cifs_chan_clear_in_reconnect(ses, server);
|
|
spin_unlock(&ses->chan_lock);
|
|
spin_unlock(&ses->ses_lock);
|
|
} else {
|
|
spin_lock(&ses->ses_lock);
|
|
if (ses->ses_status == SES_IN_SETUP)
|
|
ses->ses_status = SES_GOOD;
|
|
spin_lock(&ses->chan_lock);
|
|
cifs_chan_clear_in_reconnect(ses, server);
|
|
cifs_chan_clear_need_reconnect(ses, server);
|
|
spin_unlock(&ses->chan_lock);
|
|
spin_unlock(&ses->ses_lock);
|
|
}
|
|
|
|
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->tree_name;
|
|
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;
|
|
ctx->witness = master_tcon->use_witness;
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
if (cap_unix(ses))
|
|
reset_cifs_unix_caps(0, tcon, NULL, ctx);
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
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);
|
|
}
|
|
|
|
#ifndef CONFIG_CIFS_DFS_UPCALL
|
|
int cifs_tree_connect(const unsigned int xid, struct cifs_tcon *tcon, const struct nls_table *nlsc)
|
|
{
|
|
int rc;
|
|
const struct smb_version_operations *ops = tcon->ses->server->ops;
|
|
|
|
/* only send once per connect */
|
|
spin_lock(&tcon->tc_lock);
|
|
if (tcon->status != TID_NEW &&
|
|
tcon->status != TID_NEED_TCON) {
|
|
spin_unlock(&tcon->tc_lock);
|
|
return -EHOSTDOWN;
|
|
}
|
|
|
|
if (tcon->status == TID_GOOD) {
|
|
spin_unlock(&tcon->tc_lock);
|
|
return 0;
|
|
}
|
|
tcon->status = TID_IN_TCON;
|
|
spin_unlock(&tcon->tc_lock);
|
|
|
|
rc = ops->tree_connect(xid, tcon->ses, tcon->tree_name, tcon, nlsc);
|
|
if (rc) {
|
|
spin_lock(&tcon->tc_lock);
|
|
if (tcon->status == TID_IN_TCON)
|
|
tcon->status = TID_NEED_TCON;
|
|
spin_unlock(&tcon->tc_lock);
|
|
} else {
|
|
spin_lock(&tcon->tc_lock);
|
|
if (tcon->status == TID_IN_TCON)
|
|
tcon->status = TID_GOOD;
|
|
tcon->need_reconnect = false;
|
|
spin_unlock(&tcon->tc_lock);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
#endif
|