fs/smb/client/cifs_debug.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *
   4  *   Copyright (C) International Business Machines  Corp., 2000,2005
   5  *
   6  *   Modified by Steve French (sfrench@us.ibm.com)
   7  */
   8 #include <linux/fs.h>
   9 #include <linux/string.h>
  10 #include <linux/ctype.h>
  11 #include <linux/kstrtox.h>
  12 #include <linux/module.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/uaccess.h>
  15 #include <uapi/linux/ethtool.h>
  16 #include "cifspdu.h"
  17 #include "cifsglob.h"
  18 #include "cifsproto.h"
  19 #include "cifs_debug.h"
  20 #include "cifsfs.h"
  21 #include "fs_context.h"
  22 #ifdef CONFIG_CIFS_DFS_UPCALL
  23 #include "dfs_cache.h"
  24 #endif
  25 #ifdef CONFIG_CIFS_SMB_DIRECT
  26 #include "smbdirect.h"
  27 #endif
  28 #include "cifs_swn.h"
  29
  30 void
  31 cifs_dump_mem(char *label, void *data, int length)
  32 {
  33         pr_debug("%s: dump of %d bytes of data at 0x%p\n", label, length, data);
  34         print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 16, 4,
  35                        data, length, true);
  36 }
  37
  38 void cifs_dump_detail(void *buf, struct TCP_Server_Info *server)
  39 {
  40 #ifdef CONFIG_CIFS_DEBUG2
  41         struct smb_hdr *smb = buf;
  42
  43         cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d Wct: %d\n",
  44                  smb->Command, smb->Status.CifsError, smb->Flags,
  45                  smb->Flags2, smb->Mid, smb->Pid, smb->WordCount);
  46         if (!server->ops->check_message(buf, server->total_read, server)) {
  47                 cifs_dbg(VFS, "smb buf %p len %u\n", smb,
  48                          server->ops->calc_smb_size(smb));
  49         }
  50 #endif /* CONFIG_CIFS_DEBUG2 */
  51 }
  52
  53 void cifs_dump_mids(struct TCP_Server_Info *server)
  54 {
  55 #ifdef CONFIG_CIFS_DEBUG2
  56         struct mid_q_entry *mid_entry;
  57
  58         if (server == NULL)
  59                 return;
  60
  61         cifs_dbg(VFS, "Dump pending requests:\n");
  62         spin_lock(&server->mid_lock);
  63         list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {
  64                 cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
  65                          mid_entry->mid_state,
  66                          le16_to_cpu(mid_entry->command),
  67                          mid_entry->pid,
  68                          mid_entry->callback_data,
  69                          mid_entry->mid);
  70 #ifdef CONFIG_CIFS_STATS2
  71                 cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
  72                          mid_entry->large_buf,
  73                          mid_entry->resp_buf,
  74                          mid_entry->when_received,
  75                          jiffies);
  76 #endif /* STATS2 */
  77                 cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
  78                          mid_entry->multiRsp, mid_entry->multiEnd);
  79                 if (mid_entry->resp_buf) {
  80                         cifs_dump_detail(mid_entry->resp_buf, server);
  81                         cifs_dump_mem("existing buf: ",
  82                                 mid_entry->resp_buf, 62);
  83                 }
  84         }
  85         spin_unlock(&server->mid_lock);
  86 #endif /* CONFIG_CIFS_DEBUG2 */
  87 }
  88
  89 #ifdef CONFIG_PROC_FS
  90 static void cifs_debug_tcon(struct seq_file *m, struct cifs_tcon *tcon)
  91 {
  92         __u32 dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
  93
  94         seq_printf(m, "%s Mounts: %d ", tcon->tree_name, tcon->tc_count);
  95         if (tcon->nativeFileSystem)
  96                 seq_printf(m, "Type: %s ", tcon->nativeFileSystem);
  97         seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x\n\tPathComponentMax: %d Status: %d",
  98                    le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
  99                    le32_to_cpu(tcon->fsAttrInfo.Attributes),
 100                    le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 101                    tcon->status);
 102         if (dev_type == FILE_DEVICE_DISK)
 103                 seq_puts(m, " type: DISK ");
 104         else if (dev_type == FILE_DEVICE_CD_ROM)
 105                 seq_puts(m, " type: CDROM ");
 106         else
 107                 seq_printf(m, " type: %d ", dev_type);
 108
 109         seq_printf(m, "Serial Number: 0x%x", tcon->vol_serial_number);
 110
 111         if ((tcon->seal) ||
 112             (tcon->ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) ||
 113             (tcon->share_flags & SHI1005_FLAGS_ENCRYPT_DATA))
 114                 seq_puts(m, " encrypted");
 115         if (tcon->nocase)
 116                 seq_printf(m, " nocase");
 117         if (tcon->unix_ext)
 118                 seq_printf(m, " POSIX Extensions");
 119         if (tcon->ses->server->ops->dump_share_caps)
 120                 tcon->ses->server->ops->dump_share_caps(m, tcon);
 121         if (tcon->use_witness)
 122                 seq_puts(m, " Witness");
 123         if (tcon->broken_sparse_sup)
 124                 seq_puts(m, " nosparse");
 125         if (tcon->need_reconnect)
 126                 seq_puts(m, "\tDISCONNECTED ");
 127         spin_lock(&tcon->tc_lock);
 128         if (tcon->origin_fullpath) {
 129                 seq_printf(m, "\n\tDFS origin fullpath: %s",
 130                            tcon->origin_fullpath);
 131         }
 132         spin_unlock(&tcon->tc_lock);
 133         seq_putc(m, '\n');
 134 }
 135
 136 static void
 137 cifs_dump_channel(struct seq_file *m, int i, struct cifs_chan *chan)
 138 {
 139         struct TCP_Server_Info *server = chan->server;
 140
 141         if (!server) {
 142                 seq_printf(m, "\n\n\t\tChannel: %d DISABLED", i+1);
 143                 return;
 144         }
 145
 146         seq_printf(m, "\n\n\t\tChannel: %d ConnectionId: 0x%llx"
 147                    "\n\t\tNumber of credits: %d,%d,%d Dialect 0x%x"
 148                    "\n\t\tTCP status: %d Instance: %d"
 149                    "\n\t\tLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d"
 150                    "\n\t\tIn Send: %d In MaxReq Wait: %d",
 151                    i+1, server->conn_id,
 152                    server->credits,
 153                    server->echo_credits,
 154                    server->oplock_credits,
 155                    server->dialect,
 156                    server->tcpStatus,
 157                    server->reconnect_instance,
 158                    server->srv_count,
 159                    server->sec_mode,
 160                    in_flight(server),
 161                    atomic_read(&server->in_send),
 162                    atomic_read(&server->num_waiters));
 163 #ifdef CONFIG_NET_NS
 164         if (server->net)
 165                 seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
 166 #endif /* NET_NS */
 167
 168 }
 169
 170 static inline const char *smb_speed_to_str(size_t bps)
 171 {
 172         size_t mbps = bps / 1000 / 1000;
 173
 174         switch (mbps) {
 175         case SPEED_10:
 176                 return "10Mbps";
 177         case SPEED_100:
 178                 return "100Mbps";
 179         case SPEED_1000:
 180                 return "1Gbps";
 181         case SPEED_2500:
 182                 return "2.5Gbps";
 183         case SPEED_5000:
 184                 return "5Gbps";
 185         case SPEED_10000:
 186                 return "10Gbps";
 187         case SPEED_14000:
 188                 return "14Gbps";
 189         case SPEED_20000:
 190                 return "20Gbps";
 191         case SPEED_25000:
 192                 return "25Gbps";
 193         case SPEED_40000:
 194                 return "40Gbps";
 195         case SPEED_50000:
 196                 return "50Gbps";
 197         case SPEED_56000:
 198                 return "56Gbps";
 199         case SPEED_100000:
 200                 return "100Gbps";
 201         case SPEED_200000:
 202                 return "200Gbps";
 203         case SPEED_400000:
 204                 return "400Gbps";
 205         case SPEED_800000:
 206                 return "800Gbps";
 207         default:
 208                 return "Unknown";
 209         }
 210 }
 211
 212 static void
 213 cifs_dump_iface(struct seq_file *m, struct cifs_server_iface *iface)
 214 {
 215         struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
 216         struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
 217
 218         seq_printf(m, "\tSpeed: %s\n", smb_speed_to_str(iface->speed));
 219         seq_puts(m, "\t\tCapabilities: ");
 220         if (iface->rdma_capable)
 221                 seq_puts(m, "rdma ");
 222         if (iface->rss_capable)
 223                 seq_puts(m, "rss ");
 224         if (!iface->rdma_capable && !iface->rss_capable)
 225                 seq_puts(m, "None");
 226         seq_putc(m, '\n');
 227         if (iface->sockaddr.ss_family == AF_INET)
 228                 seq_printf(m, "\t\tIPv4: %pI4\n", &ipv4->sin_addr);
 229         else if (iface->sockaddr.ss_family == AF_INET6)
 230                 seq_printf(m, "\t\tIPv6: %pI6\n", &ipv6->sin6_addr);
 231         if (!iface->is_active)
 232                 seq_puts(m, "\t\t[for-cleanup]\n");
 233 }
 234
 235 static int cifs_debug_files_proc_show(struct seq_file *m, void *v)
 236 {
 237         struct TCP_Server_Info *server;
 238         struct cifs_ses *ses;
 239         struct cifs_tcon *tcon;
 240         struct cifsFileInfo *cfile;
 241
 242         seq_puts(m, "# Version:1\n");
 243         seq_puts(m, "# Format:\n");
 244         seq_puts(m, "# <tree id> <ses id> <persistent fid> <flags> <count> <pid> <uid>");
 245 #ifdef CONFIG_CIFS_DEBUG2
 246         seq_printf(m, " <filename> <mid>\n");
 247 #else
 248         seq_printf(m, " <filename>\n");
 249 #endif /* CIFS_DEBUG2 */
 250         spin_lock(&cifs_tcp_ses_lock);
 251         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
 252                 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
 253                         list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
 254                                 spin_lock(&tcon->open_file_lock);
 255                                 list_for_each_entry(cfile, &tcon->openFileList, tlist) {
 256                                         seq_printf(m,
 257                                                 "0x%x 0x%llx 0x%llx 0x%x %d %d %d %pd",
 258                                                 tcon->tid,
 259                                                 ses->Suid,
 260                                                 cfile->fid.persistent_fid,
 261                                                 cfile->f_flags,
 262                                                 cfile->count,
 263                                                 cfile->pid,
 264                                                 from_kuid(&init_user_ns, cfile->uid),
 265                                                 cfile->dentry);
 266 #ifdef CONFIG_CIFS_DEBUG2
 267                                         seq_printf(m, " %llu\n", cfile->fid.mid);
 268 #else
 269                                         seq_printf(m, "\n");
 270 #endif /* CIFS_DEBUG2 */
 271                                 }
 272                                 spin_unlock(&tcon->open_file_lock);
 273                         }
 274                 }
 275         }
 276         spin_unlock(&cifs_tcp_ses_lock);
 277         seq_putc(m, '\n');
 278         return 0;
 279 }
 280
 281 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 282 {
 283         struct mid_q_entry *mid_entry;
 284         struct TCP_Server_Info *server;
 285         struct TCP_Server_Info *chan_server;
 286         struct cifs_ses *ses;
 287         struct cifs_tcon *tcon;
 288         struct cifs_server_iface *iface;
 289         size_t iface_weight = 0, iface_min_speed = 0;
 290         struct cifs_server_iface *last_iface = NULL;
 291         int c, i, j;
 292
 293         seq_puts(m,
 294                     "Display Internal CIFS Data Structures for Debugging\n"
 295                     "---------------------------------------------------\n");
 296         seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 297         seq_printf(m, "Features:");
 298 #ifdef CONFIG_CIFS_DFS_UPCALL
 299         seq_printf(m, " DFS");
 300 #endif
 301 #ifdef CONFIG_CIFS_FSCACHE
 302         seq_printf(m, ",FSCACHE");
 303 #endif
 304 #ifdef CONFIG_CIFS_SMB_DIRECT
 305         seq_printf(m, ",SMB_DIRECT");
 306 #endif
 307 #ifdef CONFIG_CIFS_STATS2
 308         seq_printf(m, ",STATS2");
 309 #else
 310         seq_printf(m, ",STATS");
 311 #endif
 312 #ifdef CONFIG_CIFS_DEBUG2
 313         seq_printf(m, ",DEBUG2");
 314 #elif defined(CONFIG_CIFS_DEBUG)
 315         seq_printf(m, ",DEBUG");
 316 #endif
 317 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 318         seq_printf(m, ",ALLOW_INSECURE_LEGACY");
 319 #endif
 320 #ifdef CONFIG_CIFS_POSIX
 321         seq_printf(m, ",CIFS_POSIX");
 322 #endif
 323 #ifdef CONFIG_CIFS_UPCALL
 324         seq_printf(m, ",UPCALL(SPNEGO)");
 325 #endif
 326 #ifdef CONFIG_CIFS_XATTR
 327         seq_printf(m, ",XATTR");
 328 #endif
 329         seq_printf(m, ",ACL");
 330 #ifdef CONFIG_CIFS_SWN_UPCALL
 331         seq_puts(m, ",WITNESS");
 332 #endif
 333         seq_putc(m, '\n');
 334         seq_printf(m, "CIFSMaxBufSize: %d\n", CIFSMaxBufSize);
 335         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 336
 337         seq_printf(m, "\nServers: ");
 338
 339         c = 0;
 340         spin_lock(&cifs_tcp_ses_lock);
 341         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
 342                 /* channel info will be printed as a part of sessions below */
 343                 if (SERVER_IS_CHAN(server))
 344                         continue;
 345
 346                 c++;
 347                 seq_printf(m, "\n%d) ConnectionId: 0x%llx ",
 348                         c, server->conn_id);
 349
 350                 spin_lock(&server->srv_lock);
 351                 if (server->hostname)
 352                         seq_printf(m, "Hostname: %s ", server->hostname);
 353                 seq_printf(m, "\nClientGUID: %pUL", server->client_guid);
 354                 spin_unlock(&server->srv_lock);
 355 #ifdef CONFIG_CIFS_SMB_DIRECT
 356                 if (!server->rdma)
 357                         goto skip_rdma;
 358
 359                 if (!server->smbd_conn) {
 360                         seq_printf(m, "\nSMBDirect transport not available");
 361                         goto skip_rdma;
 362                 }
 363
 364                 seq_printf(m, "\nSMBDirect (in hex) protocol version: %x "
 365                         "transport status: %x",
 366                         server->smbd_conn->protocol,
 367                         server->smbd_conn->transport_status);
 368                 seq_printf(m, "\nConn receive_credit_max: %x "
 369                         "send_credit_target: %x max_send_size: %x",
 370                         server->smbd_conn->receive_credit_max,
 371                         server->smbd_conn->send_credit_target,
 372                         server->smbd_conn->max_send_size);
 373                 seq_printf(m, "\nConn max_fragmented_recv_size: %x "
 374                         "max_fragmented_send_size: %x max_receive_size:%x",
 375                         server->smbd_conn->max_fragmented_recv_size,
 376                         server->smbd_conn->max_fragmented_send_size,
 377                         server->smbd_conn->max_receive_size);
 378                 seq_printf(m, "\nConn keep_alive_interval: %x "
 379                         "max_readwrite_size: %x rdma_readwrite_threshold: %x",
 380                         server->smbd_conn->keep_alive_interval,
 381                         server->smbd_conn->max_readwrite_size,
 382                         server->smbd_conn->rdma_readwrite_threshold);
 383                 seq_printf(m, "\nDebug count_get_receive_buffer: %x "
 384                         "count_put_receive_buffer: %x count_send_empty: %x",
 385                         server->smbd_conn->count_get_receive_buffer,
 386                         server->smbd_conn->count_put_receive_buffer,
 387                         server->smbd_conn->count_send_empty);
 388                 seq_printf(m, "\nRead Queue count_reassembly_queue: %x "
 389                         "count_enqueue_reassembly_queue: %x "
 390                         "count_dequeue_reassembly_queue: %x "
 391                         "fragment_reassembly_remaining: %x "
 392                         "reassembly_data_length: %x "
 393                         "reassembly_queue_length: %x",
 394                         server->smbd_conn->count_reassembly_queue,
 395                         server->smbd_conn->count_enqueue_reassembly_queue,
 396                         server->smbd_conn->count_dequeue_reassembly_queue,
 397                         server->smbd_conn->fragment_reassembly_remaining,
 398                         server->smbd_conn->reassembly_data_length,
 399                         server->smbd_conn->reassembly_queue_length);
 400                 seq_printf(m, "\nCurrent Credits send_credits: %x "
 401                         "receive_credits: %x receive_credit_target: %x",
 402                         atomic_read(&server->smbd_conn->send_credits),
 403                         atomic_read(&server->smbd_conn->receive_credits),
 404                         server->smbd_conn->receive_credit_target);
 405                 seq_printf(m, "\nPending send_pending: %x ",
 406                         atomic_read(&server->smbd_conn->send_pending));
 407                 seq_printf(m, "\nReceive buffers count_receive_queue: %x "
 408                         "count_empty_packet_queue: %x",
 409                         server->smbd_conn->count_receive_queue,
 410                         server->smbd_conn->count_empty_packet_queue);
 411                 seq_printf(m, "\nMR responder_resources: %x "
 412                         "max_frmr_depth: %x mr_type: %x",
 413                         server->smbd_conn->responder_resources,
 414                         server->smbd_conn->max_frmr_depth,
 415                         server->smbd_conn->mr_type);
 416                 seq_printf(m, "\nMR mr_ready_count: %x mr_used_count: %x",
 417                         atomic_read(&server->smbd_conn->mr_ready_count),
 418                         atomic_read(&server->smbd_conn->mr_used_count));
 419 skip_rdma:
 420 #endif
 421                 seq_printf(m, "\nNumber of credits: %d,%d,%d Dialect 0x%x",
 422                         server->credits,
 423                         server->echo_credits,
 424                         server->oplock_credits,
 425                         server->dialect);
 426                 if (server->compress_algorithm == SMB3_COMPRESS_LZNT1)
 427                         seq_printf(m, " COMPRESS_LZNT1");
 428                 else if (server->compress_algorithm == SMB3_COMPRESS_LZ77)
 429                         seq_printf(m, " COMPRESS_LZ77");
 430                 else if (server->compress_algorithm == SMB3_COMPRESS_LZ77_HUFF)
 431                         seq_printf(m, " COMPRESS_LZ77_HUFF");
 432                 if (server->sign)
 433                         seq_printf(m, " signed");
 434                 if (server->posix_ext_supported)
 435                         seq_printf(m, " posix");
 436                 if (server->nosharesock)
 437                         seq_printf(m, " nosharesock");
 438
 439                 seq_printf(m, "\nServer capabilities: 0x%x", server->capabilities);
 440
 441                 if (server->rdma)
 442                         seq_printf(m, "\nRDMA ");
 443                 seq_printf(m, "\nTCP status: %d Instance: %d"
 444                                 "\nLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d",
 445                                 server->tcpStatus,
 446                                 server->reconnect_instance,
 447                                 server->srv_count,
 448                                 server->sec_mode, in_flight(server));
 449 #ifdef CONFIG_NET_NS
 450                 if (server->net)
 451                         seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
 452 #endif /* NET_NS */
 453
 454                 seq_printf(m, "\nIn Send: %d In MaxReq Wait: %d",
 455                                 atomic_read(&server->in_send),
 456                                 atomic_read(&server->num_waiters));
 457
 458                 if (server->leaf_fullpath) {
 459                         seq_printf(m, "\nDFS leaf full path: %s",
 460                                    server->leaf_fullpath);
 461                 }
 462
 463                 seq_printf(m, "\n\n\tSessions: ");
 464                 i = 0;
 465                 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
 466                         spin_lock(&ses->ses_lock);
 467                         if (ses->ses_status == SES_EXITING) {
 468                                 spin_unlock(&ses->ses_lock);
 469                                 continue;
 470                         }
 471                         i++;
 472                         if ((ses->serverDomain == NULL) ||
 473                                 (ses->serverOS == NULL) ||
 474                                 (ses->serverNOS == NULL)) {
 475                                 seq_printf(m, "\n\t%d) Address: %s Uses: %d Capability: 0x%x\tSession Status: %d ",
 476                                         i, ses->ip_addr, ses->ses_count,
 477                                         ses->capabilities, ses->ses_status);
 478                                 if (ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 479                                         seq_printf(m, "Guest ");
 480                                 else if (ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 481                                         seq_printf(m, "Anonymous ");
 482                         } else {
 483                                 seq_printf(m,
 484                                     "\n\t%d) Name: %s  Domain: %s Uses: %d OS: %s "
 485                                     "\n\tNOS: %s\tCapability: 0x%x"
 486                                         "\n\tSMB session status: %d ",
 487                                 i, ses->ip_addr, ses->serverDomain,
 488                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 489                                 ses->capabilities, ses->ses_status);
 490                         }
 491                         spin_unlock(&ses->ses_lock);
 492
 493                         seq_printf(m, "\n\tSecurity type: %s ",
 494                                 get_security_type_str(server->ops->select_sectype(server, ses->sectype)));
 495
 496                         /* dump session id helpful for use with network trace */
 497                         seq_printf(m, " SessionId: 0x%llx", ses->Suid);
 498                         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
 499                                 seq_puts(m, " encrypted");
 500                                 /* can help in debugging to show encryption type */
 501                                 if (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
 502                                         seq_puts(m, "(gcm256)");
 503                         }
 504                         if (ses->sign)
 505                                 seq_puts(m, " signed");
 506
 507                         seq_printf(m, "\n\tUser: %d Cred User: %d",
 508                                    from_kuid(&init_user_ns, ses->linux_uid),
 509                                    from_kuid(&init_user_ns, ses->cred_uid));
 510
 511                         if (ses->dfs_root_ses) {
 512                                 seq_printf(m, "\n\tDFS root session id: 0x%llx",
 513                                            ses->dfs_root_ses->Suid);
 514                         }
 515
 516                         spin_lock(&ses->chan_lock);
 517                         if (CIFS_CHAN_NEEDS_RECONNECT(ses, 0))
 518                                 seq_puts(m, "\tPrimary channel: DISCONNECTED ");
 519                         if (CIFS_CHAN_IN_RECONNECT(ses, 0))
 520                                 seq_puts(m, "\t[RECONNECTING] ");
 521
 522                         if (ses->chan_count > 1) {
 523                                 seq_printf(m, "\n\n\tExtra Channels: %zu ",
 524                                            ses->chan_count-1);
 525                                 for (j = 1; j < ses->chan_count; j++) {
 526                                         cifs_dump_channel(m, j, &ses->chans[j]);
 527                                         if (CIFS_CHAN_NEEDS_RECONNECT(ses, j))
 528                                                 seq_puts(m, "\tDISCONNECTED ");
 529                                         if (CIFS_CHAN_IN_RECONNECT(ses, j))
 530                                                 seq_puts(m, "\t[RECONNECTING] ");
 531                                 }
 532                         }
 533                         spin_unlock(&ses->chan_lock);
 534
 535                         seq_puts(m, "\n\n\tShares: ");
 536                         j = 0;
 537
 538                         seq_printf(m, "\n\t%d) IPC: ", j);
 539                         if (ses->tcon_ipc)
 540                                 cifs_debug_tcon(m, ses->tcon_ipc);
 541                         else
 542                                 seq_puts(m, "none\n");
 543
 544                         list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
 545                                 ++j;
 546                                 seq_printf(m, "\n\t%d) ", j);
 547                                 cifs_debug_tcon(m, tcon);
 548                         }
 549
 550                         spin_lock(&ses->iface_lock);
 551                         if (ses->iface_count)
 552                                 seq_printf(m, "\n\n\tServer interfaces: %zu"
 553                                            "\tLast updated: %lu seconds ago",
 554                                            ses->iface_count,
 555                                            (jiffies - ses->iface_last_update) / HZ);
 556
 557                         last_iface = list_last_entry(&ses->iface_list,
 558                                                      struct cifs_server_iface,
 559                                                      iface_head);
 560                         iface_min_speed = last_iface->speed;
 561
 562                         j = 0;
 563                         list_for_each_entry(iface, &ses->iface_list,
 564                                                  iface_head) {
 565                                 seq_printf(m, "\n\t%d)", ++j);
 566                                 cifs_dump_iface(m, iface);
 567
 568                                 iface_weight = iface->speed / iface_min_speed;
 569                                 seq_printf(m, "\t\tWeight (cur,total): (%zu,%zu)"
 570                                            "\n\t\tAllocated channels: %u\n",
 571                                            iface->weight_fulfilled,
 572                                            iface_weight,
 573                                            iface->num_channels);
 574
 575                                 if (is_ses_using_iface(ses, iface))
 576                                         seq_puts(m, "\t\t[CONNECTED]\n");
 577                         }
 578                         spin_unlock(&ses->iface_lock);
 579
 580                         seq_puts(m, "\n\n\tMIDs: ");
 581                         spin_lock(&ses->chan_lock);
 582                         for (j = 0; j < ses->chan_count; j++) {
 583                                 chan_server = ses->chans[j].server;
 584                                 if (!chan_server)
 585                                         continue;
 586
 587                                 if (list_empty(&chan_server->pending_mid_q))
 588                                         continue;
 589
 590                                 seq_printf(m, "\n\tServer ConnectionId: 0x%llx",
 591                                            chan_server->conn_id);
 592                                 spin_lock(&chan_server->mid_lock);
 593                                 list_for_each_entry(mid_entry, &chan_server->pending_mid_q, qhead) {
 594                                         seq_printf(m, "\n\t\tState: %d com: %d pid: %d cbdata: %p mid %llu",
 595                                                    mid_entry->mid_state,
 596                                                    le16_to_cpu(mid_entry->command),
 597                                                    mid_entry->pid,
 598                                                    mid_entry->callback_data,
 599                                                    mid_entry->mid);
 600                                 }
 601                                 spin_unlock(&chan_server->mid_lock);
 602                         }
 603                         spin_unlock(&ses->chan_lock);
 604                         seq_puts(m, "\n--\n");
 605                 }
 606                 if (i == 0)
 607                         seq_printf(m, "\n\t\t[NONE]");
 608         }
 609         if (c == 0)
 610                 seq_printf(m, "\n\t[NONE]");
 611
 612         spin_unlock(&cifs_tcp_ses_lock);
 613         seq_putc(m, '\n');
 614         cifs_swn_dump(m);
 615
 616         /* BB add code to dump additional info such as TCP session info now */
 617         return 0;
 618 }
 619
 620 static ssize_t cifs_stats_proc_write(struct file *file,
 621                 const char __user *buffer, size_t count, loff_t *ppos)
 622 {
 623         bool bv;
 624         int rc;
 625         struct TCP_Server_Info *server;
 626         struct cifs_ses *ses;
 627         struct cifs_tcon *tcon;
 628
 629         rc = kstrtobool_from_user(buffer, count, &bv);
 630         if (rc == 0) {
 631 #ifdef CONFIG_CIFS_STATS2
 632                 int i;
 633
 634                 atomic_set(&total_buf_alloc_count, 0);
 635                 atomic_set(&total_small_buf_alloc_count, 0);
 636 #endif /* CONFIG_CIFS_STATS2 */
 637                 atomic_set(&tcpSesReconnectCount, 0);
 638                 atomic_set(&tconInfoReconnectCount, 0);
 639
 640                 spin_lock(&GlobalMid_Lock);
 641                 GlobalMaxActiveXid = 0;
 642                 GlobalCurrentXid = 0;
 643                 spin_unlock(&GlobalMid_Lock);
 644                 spin_lock(&cifs_tcp_ses_lock);
 645                 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
 646                         server->max_in_flight = 0;
 647 #ifdef CONFIG_CIFS_STATS2
 648                         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 649                                 atomic_set(&server->num_cmds[i], 0);
 650                                 atomic_set(&server->smb2slowcmd[i], 0);
 651                                 server->time_per_cmd[i] = 0;
 652                                 server->slowest_cmd[i] = 0;
 653                                 server->fastest_cmd[0] = 0;
 654                         }
 655 #endif /* CONFIG_CIFS_STATS2 */
 656                         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
 657                                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
 658                                         atomic_set(&tcon->num_smbs_sent, 0);
 659                                         spin_lock(&tcon->stat_lock);
 660                                         tcon->bytes_read = 0;
 661                                         tcon->bytes_written = 0;
 662                                         spin_unlock(&tcon->stat_lock);
 663                                         if (server->ops->clear_stats)
 664                                                 server->ops->clear_stats(tcon);
 665                                 }
 666                         }
 667                 }
 668                 spin_unlock(&cifs_tcp_ses_lock);
 669         } else {
 670                 return rc;
 671         }
 672
 673         return count;
 674 }
 675
 676 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 677 {
 678         int i;
 679 #ifdef CONFIG_CIFS_STATS2
 680         int j;
 681 #endif /* STATS2 */
 682         struct TCP_Server_Info *server;
 683         struct cifs_ses *ses;
 684         struct cifs_tcon *tcon;
 685
 686         seq_printf(m, "Resources in use\nCIFS Session: %d\n",
 687                         sesInfoAllocCount.counter);
 688         seq_printf(m, "Share (unique mount targets): %d\n",
 689                         tconInfoAllocCount.counter);
 690         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 691                         buf_alloc_count.counter,
 692                         cifs_min_rcv + tcpSesAllocCount.counter);
 693         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 694                         small_buf_alloc_count.counter, cifs_min_small);
 695 #ifdef CONFIG_CIFS_STATS2
 696         seq_printf(m, "Total Large %d Small %d Allocations\n",
 697                                 atomic_read(&total_buf_alloc_count),
 698                                 atomic_read(&total_small_buf_alloc_count));
 699 #endif /* CONFIG_CIFS_STATS2 */
 700
 701         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&mid_count));
 702         seq_printf(m,
 703                 "\n%d session %d share reconnects\n",
 704                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 705
 706         seq_printf(m,
 707                 "Total vfs operations: %d maximum at one time: %d\n",
 708                 GlobalCurrentXid, GlobalMaxActiveXid);
 709
 710         i = 0;
 711         spin_lock(&cifs_tcp_ses_lock);
 712         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
 713                 seq_printf(m, "\nMax requests in flight: %d", server->max_in_flight);
 714 #ifdef CONFIG_CIFS_STATS2
 715                 seq_puts(m, "\nTotal time spent processing by command. Time ");
 716                 seq_printf(m, "units are jiffies (%d per second)\n", HZ);
 717                 seq_puts(m, "  SMB3 CMD\tNumber\tTotal Time\tFastest\tSlowest\n");
 718                 seq_puts(m, "  --------\t------\t----------\t-------\t-------\n");
 719                 for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
 720                         seq_printf(m, "  %d\t\t%d\t%llu\t\t%u\t%u\n", j,
 721                                 atomic_read(&server->num_cmds[j]),
 722                                 server->time_per_cmd[j],
 723                                 server->fastest_cmd[j],
 724                                 server->slowest_cmd[j]);
 725                 for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
 726                         if (atomic_read(&server->smb2slowcmd[j])) {
 727                                 spin_lock(&server->srv_lock);
 728                                 seq_printf(m, "  %d slow responses from %s for command %d\n",
 729                                         atomic_read(&server->smb2slowcmd[j]),
 730                                         server->hostname, j);
 731                                 spin_unlock(&server->srv_lock);
 732                         }
 733 #endif /* STATS2 */
 734                 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
 735                         list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
 736                                 i++;
 737                                 seq_printf(m, "\n%d) %s", i, tcon->tree_name);
 738                                 if (tcon->need_reconnect)
 739                                         seq_puts(m, "\tDISCONNECTED ");
 740                                 seq_printf(m, "\nSMBs: %d",
 741                                            atomic_read(&tcon->num_smbs_sent));
 742                                 if (server->ops->print_stats)
 743                                         server->ops->print_stats(m, tcon);
 744                         }
 745                 }
 746         }
 747         spin_unlock(&cifs_tcp_ses_lock);
 748
 749         seq_putc(m, '\n');
 750         return 0;
 751 }
 752
 753 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 754 {
 755         return single_open(file, cifs_stats_proc_show, NULL);
 756 }
 757
 758 static const struct proc_ops cifs_stats_proc_ops = {
 759         .proc_open      = cifs_stats_proc_open,
 760         .proc_read      = seq_read,
 761         .proc_lseek     = seq_lseek,
 762         .proc_release   = single_release,
 763         .proc_write     = cifs_stats_proc_write,
 764 };
 765
 766 #ifdef CONFIG_CIFS_SMB_DIRECT
 767 #define PROC_FILE_DEFINE(name) \
 768 static ssize_t name##_write(struct file *file, const char __user *buffer, \
 769         size_t count, loff_t *ppos) \
 770 { \
 771         int rc; \
 772         rc = kstrtoint_from_user(buffer, count, 10, &name); \
 773         if (rc) \
 774                 return rc; \
 775         return count; \
 776 } \
 777 static int name##_proc_show(struct seq_file *m, void *v) \
 778 { \
 779         seq_printf(m, "%d\n", name); \
 780         return 0; \
 781 } \
 782 static int name##_open(struct inode *inode, struct file *file) \
 783 { \
 784         return single_open(file, name##_proc_show, NULL); \
 785 } \
 786 \
 787 static const struct proc_ops cifs_##name##_proc_fops = { \
 788         .proc_open      = name##_open, \
 789         .proc_read      = seq_read, \
 790         .proc_lseek     = seq_lseek, \
 791         .proc_release   = single_release, \
 792         .proc_write     = name##_write, \
 793 }
 794
 795 PROC_FILE_DEFINE(rdma_readwrite_threshold);
 796 PROC_FILE_DEFINE(smbd_max_frmr_depth);
 797 PROC_FILE_DEFINE(smbd_keep_alive_interval);
 798 PROC_FILE_DEFINE(smbd_max_receive_size);
 799 PROC_FILE_DEFINE(smbd_max_fragmented_recv_size);
 800 PROC_FILE_DEFINE(smbd_max_send_size);
 801 PROC_FILE_DEFINE(smbd_send_credit_target);
 802 PROC_FILE_DEFINE(smbd_receive_credit_max);
 803 #endif
 804
 805 static struct proc_dir_entry *proc_fs_cifs;
 806 static const struct proc_ops cifsFYI_proc_ops;
 807 static const struct proc_ops cifs_lookup_cache_proc_ops;
 808 static const struct proc_ops traceSMB_proc_ops;
 809 static const struct proc_ops cifs_security_flags_proc_ops;
 810 static const struct proc_ops cifs_linux_ext_proc_ops;
 811 static const struct proc_ops cifs_mount_params_proc_ops;
 812
 813 void
 814 cifs_proc_init(void)
 815 {
 816         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 817         if (proc_fs_cifs == NULL)
 818                 return;
 819
 820         proc_create_single("DebugData", 0, proc_fs_cifs,
 821                         cifs_debug_data_proc_show);
 822
 823         proc_create_single("open_files", 0400, proc_fs_cifs,
 824                         cifs_debug_files_proc_show);
 825
 826         proc_create("Stats", 0644, proc_fs_cifs, &cifs_stats_proc_ops);
 827         proc_create("cifsFYI", 0644, proc_fs_cifs, &cifsFYI_proc_ops);
 828         proc_create("traceSMB", 0644, proc_fs_cifs, &traceSMB_proc_ops);
 829         proc_create("LinuxExtensionsEnabled", 0644, proc_fs_cifs,
 830                     &cifs_linux_ext_proc_ops);
 831         proc_create("SecurityFlags", 0644, proc_fs_cifs,
 832                     &cifs_security_flags_proc_ops);
 833         proc_create("LookupCacheEnabled", 0644, proc_fs_cifs,
 834                     &cifs_lookup_cache_proc_ops);
 835
 836         proc_create("mount_params", 0444, proc_fs_cifs, &cifs_mount_params_proc_ops);
 837
 838 #ifdef CONFIG_CIFS_DFS_UPCALL
 839         proc_create("dfscache", 0644, proc_fs_cifs, &dfscache_proc_ops);
 840 #endif
 841
 842 #ifdef CONFIG_CIFS_SMB_DIRECT
 843         proc_create("rdma_readwrite_threshold", 0644, proc_fs_cifs,
 844                 &cifs_rdma_readwrite_threshold_proc_fops);
 845         proc_create("smbd_max_frmr_depth", 0644, proc_fs_cifs,
 846                 &cifs_smbd_max_frmr_depth_proc_fops);
 847         proc_create("smbd_keep_alive_interval", 0644, proc_fs_cifs,
 848                 &cifs_smbd_keep_alive_interval_proc_fops);
 849         proc_create("smbd_max_receive_size", 0644, proc_fs_cifs,
 850                 &cifs_smbd_max_receive_size_proc_fops);
 851         proc_create("smbd_max_fragmented_recv_size", 0644, proc_fs_cifs,
 852                 &cifs_smbd_max_fragmented_recv_size_proc_fops);
 853         proc_create("smbd_max_send_size", 0644, proc_fs_cifs,
 854                 &cifs_smbd_max_send_size_proc_fops);
 855         proc_create("smbd_send_credit_target", 0644, proc_fs_cifs,
 856                 &cifs_smbd_send_credit_target_proc_fops);
 857         proc_create("smbd_receive_credit_max", 0644, proc_fs_cifs,
 858                 &cifs_smbd_receive_credit_max_proc_fops);
 859 #endif
 860 }
 861
 862 void
 863 cifs_proc_clean(void)
 864 {
 865         if (proc_fs_cifs == NULL)
 866                 return;
 867
 868         remove_proc_entry("DebugData", proc_fs_cifs);
 869         remove_proc_entry("open_files", proc_fs_cifs);
 870         remove_proc_entry("cifsFYI", proc_fs_cifs);
 871         remove_proc_entry("traceSMB", proc_fs_cifs);
 872         remove_proc_entry("Stats", proc_fs_cifs);
 873         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 874         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 875         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 876         remove_proc_entry("mount_params", proc_fs_cifs);
 877
 878 #ifdef CONFIG_CIFS_DFS_UPCALL
 879         remove_proc_entry("dfscache", proc_fs_cifs);
 880 #endif
 881 #ifdef CONFIG_CIFS_SMB_DIRECT
 882         remove_proc_entry("rdma_readwrite_threshold", proc_fs_cifs);
 883         remove_proc_entry("smbd_max_frmr_depth", proc_fs_cifs);
 884         remove_proc_entry("smbd_keep_alive_interval", proc_fs_cifs);
 885         remove_proc_entry("smbd_max_receive_size", proc_fs_cifs);
 886         remove_proc_entry("smbd_max_fragmented_recv_size", proc_fs_cifs);
 887         remove_proc_entry("smbd_max_send_size", proc_fs_cifs);
 888         remove_proc_entry("smbd_send_credit_target", proc_fs_cifs);
 889         remove_proc_entry("smbd_receive_credit_max", proc_fs_cifs);
 890 #endif
 891         remove_proc_entry("fs/cifs", NULL);
 892 }
 893
 894 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 895 {
 896         seq_printf(m, "%d\n", cifsFYI);
 897         return 0;
 898 }
 899
 900 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 901 {
 902         return single_open(file, cifsFYI_proc_show, NULL);
 903 }
 904
 905 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 906                 size_t count, loff_t *ppos)
 907 {
 908         char c[2] = { '\0' };
 909         bool bv;
 910         int rc;
 911
 912         rc = get_user(c[0], buffer);
 913         if (rc)
 914                 return rc;
 915         if (kstrtobool(c, &bv) == 0)
 916                 cifsFYI = bv;
 917         else if ((c[0] > '1') && (c[0] <= '9'))
 918                 cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
 919         else
 920                 return -EINVAL;
 921
 922         return count;
 923 }
 924
 925 static const struct proc_ops cifsFYI_proc_ops = {
 926         .proc_open      = cifsFYI_proc_open,
 927         .proc_read      = seq_read,
 928         .proc_lseek     = seq_lseek,
 929         .proc_release   = single_release,
 930         .proc_write     = cifsFYI_proc_write,
 931 };
 932
 933 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 934 {
 935         seq_printf(m, "%d\n", linuxExtEnabled);
 936         return 0;
 937 }
 938
 939 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 940 {
 941         return single_open(file, cifs_linux_ext_proc_show, NULL);
 942 }
 943
 944 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 945                 const char __user *buffer, size_t count, loff_t *ppos)
 946 {
 947         int rc;
 948
 949         rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
 950         if (rc)
 951                 return rc;
 952
 953         return count;
 954 }
 955
 956 static const struct proc_ops cifs_linux_ext_proc_ops = {
 957         .proc_open      = cifs_linux_ext_proc_open,
 958         .proc_read      = seq_read,
 959         .proc_lseek     = seq_lseek,
 960         .proc_release   = single_release,
 961         .proc_write     = cifs_linux_ext_proc_write,
 962 };
 963
 964 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 965 {
 966         seq_printf(m, "%d\n", lookupCacheEnabled);
 967         return 0;
 968 }
 969
 970 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 971 {
 972         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 973 }
 974
 975 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 976                 const char __user *buffer, size_t count, loff_t *ppos)
 977 {
 978         int rc;
 979
 980         rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
 981         if (rc)
 982                 return rc;
 983
 984         return count;
 985 }
 986
 987 static const struct proc_ops cifs_lookup_cache_proc_ops = {
 988         .proc_open      = cifs_lookup_cache_proc_open,
 989         .proc_read      = seq_read,
 990         .proc_lseek     = seq_lseek,
 991         .proc_release   = single_release,
 992         .proc_write     = cifs_lookup_cache_proc_write,
 993 };
 994
 995 static int traceSMB_proc_show(struct seq_file *m, void *v)
 996 {
 997         seq_printf(m, "%d\n", traceSMB);
 998         return 0;
 999 }
1000
1001 static int traceSMB_proc_open(struct inode *inode, struct file *file)
1002 {
1003         return single_open(file, traceSMB_proc_show, NULL);
1004 }
1005
1006 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
1007                 size_t count, loff_t *ppos)
1008 {
1009         int rc;
1010
1011         rc = kstrtobool_from_user(buffer, count, &traceSMB);
1012         if (rc)
1013                 return rc;
1014
1015         return count;
1016 }
1017
1018 static const struct proc_ops traceSMB_proc_ops = {
1019         .proc_open      = traceSMB_proc_open,
1020         .proc_read      = seq_read,
1021         .proc_lseek     = seq_lseek,
1022         .proc_release   = single_release,
1023         .proc_write     = traceSMB_proc_write,
1024 };
1025
1026 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
1027 {
1028         seq_printf(m, "0x%x\n", global_secflags);
1029         return 0;
1030 }
1031
1032 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
1033 {
1034         return single_open(file, cifs_security_flags_proc_show, NULL);
1035 }
1036
1037 /*
1038  * Ensure that if someone sets a MUST flag, that we disable all other MAY
1039  * flags except for the ones corresponding to the given MUST flag. If there are
1040  * multiple MUST flags, then try to prefer more secure ones.
1041  */
1042 static void
1043 cifs_security_flags_handle_must_flags(unsigned int *flags)
1044 {
1045         unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
1046
1047         if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
1048                 *flags = CIFSSEC_MUST_KRB5;
1049         else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
1050                 *flags = CIFSSEC_MUST_NTLMSSP;
1051         else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
1052                 *flags = CIFSSEC_MUST_NTLMV2;
1053
1054         *flags |= signflags;
1055 }
1056
1057 static ssize_t cifs_security_flags_proc_write(struct file *file,
1058                 const char __user *buffer, size_t count, loff_t *ppos)
1059 {
1060         int rc;
1061         unsigned int flags;
1062         char flags_string[12];
1063         bool bv;
1064
1065         if ((count < 1) || (count > 11))
1066                 return -EINVAL;
1067
1068         memset(flags_string, 0, 12);
1069
1070         if (copy_from_user(flags_string, buffer, count))
1071                 return -EFAULT;
1072
1073         if (count < 3) {
1074                 /* single char or single char followed by null */
1075                 if (kstrtobool(flags_string, &bv) == 0) {
1076                         global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
1077                         return count;
1078                 } else if (!isdigit(flags_string[0])) {
1079                         cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
1080                                         flags_string);
1081                         return -EINVAL;
1082                 }
1083         }
1084
1085         /* else we have a number */
1086         rc = kstrtouint(flags_string, 0, &flags);
1087         if (rc) {
1088                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
1089                                 flags_string);
1090                 return rc;
1091         }
1092
1093         cifs_dbg(FYI, "sec flags 0x%x\n", flags);
1094
1095         if (flags == 0)  {
1096                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
1097                 return -EINVAL;
1098         }
1099
1100         if (flags & ~CIFSSEC_MASK) {
1101                 cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
1102                          flags & ~CIFSSEC_MASK);
1103                 return -EINVAL;
1104         }
1105
1106         cifs_security_flags_handle_must_flags(&flags);
1107
1108         /* flags look ok - update the global security flags for cifs module */
1109         global_secflags = flags;
1110         if (global_secflags & CIFSSEC_MUST_SIGN) {
1111                 /* requiring signing implies signing is allowed */
1112                 global_secflags |= CIFSSEC_MAY_SIGN;
1113                 cifs_dbg(FYI, "packet signing now required\n");
1114         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
1115                 cifs_dbg(FYI, "packet signing disabled\n");
1116         }
1117         /* BB should we turn on MAY flags for other MUST options? */
1118         return count;
1119 }
1120
1121 static const struct proc_ops cifs_security_flags_proc_ops = {
1122         .proc_open      = cifs_security_flags_proc_open,
1123         .proc_read      = seq_read,
1124         .proc_lseek     = seq_lseek,
1125         .proc_release   = single_release,
1126         .proc_write     = cifs_security_flags_proc_write,
1127 };
1128
1129 /* To make it easier to debug, can help to show mount params */
1130 static int cifs_mount_params_proc_show(struct seq_file *m, void *v)
1131 {
1132         const struct fs_parameter_spec *p;
1133         const char *type;
1134
1135         for (p = smb3_fs_parameters; p->name; p++) {
1136                 /* cannot use switch with pointers... */
1137                 if (!p->type) {
1138                         if (p->flags == fs_param_neg_with_no)
1139                                 type = "noflag";
1140                         else
1141                                 type = "flag";
1142                 } else if (p->type == fs_param_is_bool)
1143                         type = "bool";
1144                 else if (p->type == fs_param_is_u32)
1145                         type = "u32";
1146                 else if (p->type == fs_param_is_u64)
1147                         type = "u64";
1148                 else if (p->type == fs_param_is_string)
1149                         type = "string";
1150                 else
1151                         type = "unknown";
1152
1153                 seq_printf(m, "%s:%s\n", p->name, type);
1154         }
1155
1156         return 0;
1157 }
1158
1159 static int cifs_mount_params_proc_open(struct inode *inode, struct file *file)
1160 {
1161         return single_open(file, cifs_mount_params_proc_show, NULL);
1162 }
1163
1164 static const struct proc_ops cifs_mount_params_proc_ops = {
1165         .proc_open      = cifs_mount_params_proc_open,
1166         .proc_read      = seq_read,
1167         .proc_lseek     = seq_lseek,
1168         .proc_release   = single_release,
1169         /* No need for write for now */
1170         /* .proc_write  = cifs_mount_params_proc_write, */
1171 };
1172
1173 #else
1174 inline void cifs_proc_init(void)
1175 {
1176 }
1177
1178 inline void cifs_proc_clean(void)
1179 {
1180 }
1181 #endif /* PROC_FS */