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 __always_inline const char *compression_alg_str(__le16 alg)
 282 {
 283         switch (alg) {
 284         case SMB3_COMPRESS_NONE:
 285                 return "NONE";
 286         case SMB3_COMPRESS_LZNT1:
 287                 return "LZNT1";
 288         case SMB3_COMPRESS_LZ77:
 289                 return "LZ77";
 290         case SMB3_COMPRESS_LZ77_HUFF:
 291                 return "LZ77-Huffman";
 292         case SMB3_COMPRESS_PATTERN:
 293                 return "Pattern_V1";
 294         default:
 295                 return "invalid";
 296         }
 297 }
 298
 299 static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 300 {
 301         struct mid_q_entry *mid_entry;
 302         struct TCP_Server_Info *server;
 303         struct TCP_Server_Info *chan_server;
 304         struct cifs_ses *ses;
 305         struct cifs_tcon *tcon;
 306         struct cifs_server_iface *iface;
 307         size_t iface_weight = 0, iface_min_speed = 0;
 308         struct cifs_server_iface *last_iface = NULL;
 309         int c, i, j;
 310
 311         seq_puts(m,
 312                     "Display Internal CIFS Data Structures for Debugging\n"
 313                     "---------------------------------------------------\n");
 314         seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 315         seq_printf(m, "Features:");
 316 #ifdef CONFIG_CIFS_DFS_UPCALL
 317         seq_printf(m, " DFS");
 318 #endif
 319 #ifdef CONFIG_CIFS_FSCACHE
 320         seq_printf(m, ",FSCACHE");
 321 #endif
 322 #ifdef CONFIG_CIFS_SMB_DIRECT
 323         seq_printf(m, ",SMB_DIRECT");
 324 #endif
 325 #ifdef CONFIG_CIFS_STATS2
 326         seq_printf(m, ",STATS2");
 327 #else
 328         seq_printf(m, ",STATS");
 329 #endif
 330 #ifdef CONFIG_CIFS_DEBUG2
 331         seq_printf(m, ",DEBUG2");
 332 #elif defined(CONFIG_CIFS_DEBUG)
 333         seq_printf(m, ",DEBUG");
 334 #endif
 335 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 336         seq_printf(m, ",ALLOW_INSECURE_LEGACY");
 337 #endif
 338 #ifdef CONFIG_CIFS_POSIX
 339         seq_printf(m, ",CIFS_POSIX");
 340 #endif
 341 #ifdef CONFIG_CIFS_UPCALL
 342         seq_printf(m, ",UPCALL(SPNEGO)");
 343 #endif
 344 #ifdef CONFIG_CIFS_XATTR
 345         seq_printf(m, ",XATTR");
 346 #endif
 347         seq_printf(m, ",ACL");
 348 #ifdef CONFIG_CIFS_SWN_UPCALL
 349         seq_puts(m, ",WITNESS");
 350 #endif
 351         seq_putc(m, '\n');
 352         seq_printf(m, "CIFSMaxBufSize: %d\n", CIFSMaxBufSize);
 353         seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 354
 355         seq_printf(m, "\nServers: ");
 356
 357         c = 0;
 358         spin_lock(&cifs_tcp_ses_lock);
 359         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
 360                 /* channel info will be printed as a part of sessions below */
 361                 if (SERVER_IS_CHAN(server))
 362                         continue;
 363
 364                 c++;
 365                 seq_printf(m, "\n%d) ConnectionId: 0x%llx ",
 366                         c, server->conn_id);
 367
 368                 spin_lock(&server->srv_lock);
 369                 if (server->hostname)
 370                         seq_printf(m, "Hostname: %s ", server->hostname);
 371                 seq_printf(m, "\nClientGUID: %pUL", server->client_guid);
 372                 spin_unlock(&server->srv_lock);
 373 #ifdef CONFIG_CIFS_SMB_DIRECT
 374                 if (!server->rdma)
 375                         goto skip_rdma;
 376
 377                 if (!server->smbd_conn) {
 378                         seq_printf(m, "\nSMBDirect transport not available");
 379                         goto skip_rdma;
 380                 }
 381
 382                 seq_printf(m, "\nSMBDirect (in hex) protocol version: %x "
 383                         "transport status: %x",
 384                         server->smbd_conn->protocol,
 385                         server->smbd_conn->transport_status);
 386                 seq_printf(m, "\nConn receive_credit_max: %x "
 387                         "send_credit_target: %x max_send_size: %x",
 388                         server->smbd_conn->receive_credit_max,
 389                         server->smbd_conn->send_credit_target,
 390                         server->smbd_conn->max_send_size);
 391                 seq_printf(m, "\nConn max_fragmented_recv_size: %x "
 392                         "max_fragmented_send_size: %x max_receive_size:%x",
 393                         server->smbd_conn->max_fragmented_recv_size,
 394                         server->smbd_conn->max_fragmented_send_size,
 395                         server->smbd_conn->max_receive_size);
 396                 seq_printf(m, "\nConn keep_alive_interval: %x "
 397                         "max_readwrite_size: %x rdma_readwrite_threshold: %x",
 398                         server->smbd_conn->keep_alive_interval,
 399                         server->smbd_conn->max_readwrite_size,
 400                         server->smbd_conn->rdma_readwrite_threshold);
 401                 seq_printf(m, "\nDebug count_get_receive_buffer: %x "
 402                         "count_put_receive_buffer: %x count_send_empty: %x",
 403                         server->smbd_conn->count_get_receive_buffer,
 404                         server->smbd_conn->count_put_receive_buffer,
 405                         server->smbd_conn->count_send_empty);
 406                 seq_printf(m, "\nRead Queue count_reassembly_queue: %x "
 407                         "count_enqueue_reassembly_queue: %x "
 408                         "count_dequeue_reassembly_queue: %x "
 409                         "fragment_reassembly_remaining: %x "
 410                         "reassembly_data_length: %x "
 411                         "reassembly_queue_length: %x",
 412                         server->smbd_conn->count_reassembly_queue,
 413                         server->smbd_conn->count_enqueue_reassembly_queue,
 414                         server->smbd_conn->count_dequeue_reassembly_queue,
 415                         server->smbd_conn->fragment_reassembly_remaining,
 416                         server->smbd_conn->reassembly_data_length,
 417                         server->smbd_conn->reassembly_queue_length);
 418                 seq_printf(m, "\nCurrent Credits send_credits: %x "
 419                         "receive_credits: %x receive_credit_target: %x",
 420                         atomic_read(&server->smbd_conn->send_credits),
 421                         atomic_read(&server->smbd_conn->receive_credits),
 422                         server->smbd_conn->receive_credit_target);
 423                 seq_printf(m, "\nPending send_pending: %x ",
 424                         atomic_read(&server->smbd_conn->send_pending));
 425                 seq_printf(m, "\nReceive buffers count_receive_queue: %x "
 426                         "count_empty_packet_queue: %x",
 427                         server->smbd_conn->count_receive_queue,
 428                         server->smbd_conn->count_empty_packet_queue);
 429                 seq_printf(m, "\nMR responder_resources: %x "
 430                         "max_frmr_depth: %x mr_type: %x",
 431                         server->smbd_conn->responder_resources,
 432                         server->smbd_conn->max_frmr_depth,
 433                         server->smbd_conn->mr_type);
 434                 seq_printf(m, "\nMR mr_ready_count: %x mr_used_count: %x",
 435                         atomic_read(&server->smbd_conn->mr_ready_count),
 436                         atomic_read(&server->smbd_conn->mr_used_count));
 437 skip_rdma:
 438 #endif
 439                 seq_printf(m, "\nNumber of credits: %d,%d,%d Dialect 0x%x",
 440                         server->credits,
 441                         server->echo_credits,
 442                         server->oplock_credits,
 443                         server->dialect);
 444                 if (server->sign)
 445                         seq_printf(m, " signed");
 446                 if (server->posix_ext_supported)
 447                         seq_printf(m, " posix");
 448                 if (server->nosharesock)
 449                         seq_printf(m, " nosharesock");
 450
 451                 seq_printf(m, "\nServer capabilities: 0x%x", server->capabilities);
 452
 453                 if (server->rdma)
 454                         seq_printf(m, "\nRDMA ");
 455                 seq_printf(m, "\nTCP status: %d Instance: %d"
 456                                 "\nLocal Users To Server: %d SecMode: 0x%x Req On Wire: %d",
 457                                 server->tcpStatus,
 458                                 server->reconnect_instance,
 459                                 server->srv_count,
 460                                 server->sec_mode, in_flight(server));
 461 #ifdef CONFIG_NET_NS
 462                 if (server->net)
 463                         seq_printf(m, " Net namespace: %u ", server->net->ns.inum);
 464 #endif /* NET_NS */
 465
 466                 seq_printf(m, "\nIn Send: %d In MaxReq Wait: %d",
 467                                 atomic_read(&server->in_send),
 468                                 atomic_read(&server->num_waiters));
 469
 470                 if (server->leaf_fullpath) {
 471                         seq_printf(m, "\nDFS leaf full path: %s",
 472                                    server->leaf_fullpath);
 473                 }
 474
 475                 seq_puts(m, "\nCompression: ");
 476                 if (!server->compression.requested)
 477                         seq_puts(m, "disabled on mount");
 478                 else if (server->compression.enabled)
 479                         seq_printf(m, "enabled (%s)", compression_alg_str(server->compression.alg));
 480                 else
 481                         seq_puts(m, "disabled (not supported by this server)");
 482
 483                 seq_printf(m, "\n\n\tSessions: ");
 484                 i = 0;
 485                 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
 486                         spin_lock(&ses->ses_lock);
 487                         if (ses->ses_status == SES_EXITING) {
 488                                 spin_unlock(&ses->ses_lock);
 489                                 continue;
 490                         }
 491                         i++;
 492                         if ((ses->serverDomain == NULL) ||
 493                                 (ses->serverOS == NULL) ||
 494                                 (ses->serverNOS == NULL)) {
 495                                 seq_printf(m, "\n\t%d) Address: %s Uses: %d Capability: 0x%x\tSession Status: %d ",
 496                                         i, ses->ip_addr, ses->ses_count,
 497                                         ses->capabilities, ses->ses_status);
 498                                 if (ses->session_flags & SMB2_SESSION_FLAG_IS_GUEST)
 499                                         seq_printf(m, "Guest ");
 500                                 else if (ses->session_flags & SMB2_SESSION_FLAG_IS_NULL)
 501                                         seq_printf(m, "Anonymous ");
 502                         } else {
 503                                 seq_printf(m,
 504                                     "\n\t%d) Name: %s  Domain: %s Uses: %d OS: %s "
 505                                     "\n\tNOS: %s\tCapability: 0x%x"
 506                                         "\n\tSMB session status: %d ",
 507                                 i, ses->ip_addr, ses->serverDomain,
 508                                 ses->ses_count, ses->serverOS, ses->serverNOS,
 509                                 ses->capabilities, ses->ses_status);
 510                         }
 511                         if (ses->expired_pwd)
 512                                 seq_puts(m, "password no longer valid ");
 513                         spin_unlock(&ses->ses_lock);
 514
 515                         seq_printf(m, "\n\tSecurity type: %s ",
 516                                 get_security_type_str(server->ops->select_sectype(server, ses->sectype)));
 517
 518                         /* dump session id helpful for use with network trace */
 519                         seq_printf(m, " SessionId: 0x%llx", ses->Suid);
 520                         if (ses->session_flags & SMB2_SESSION_FLAG_ENCRYPT_DATA) {
 521                                 seq_puts(m, " encrypted");
 522                                 /* can help in debugging to show encryption type */
 523                                 if (server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)
 524                                         seq_puts(m, "(gcm256)");
 525                         }
 526                         if (ses->sign)
 527                                 seq_puts(m, " signed");
 528
 529                         seq_printf(m, "\n\tUser: %d Cred User: %d",
 530                                    from_kuid(&init_user_ns, ses->linux_uid),
 531                                    from_kuid(&init_user_ns, ses->cred_uid));
 532
 533                         if (ses->dfs_root_ses) {
 534                                 seq_printf(m, "\n\tDFS root session id: 0x%llx",
 535                                            ses->dfs_root_ses->Suid);
 536                         }
 537
 538                         spin_lock(&ses->chan_lock);
 539                         if (CIFS_CHAN_NEEDS_RECONNECT(ses, 0))
 540                                 seq_puts(m, "\tPrimary channel: DISCONNECTED ");
 541                         if (CIFS_CHAN_IN_RECONNECT(ses, 0))
 542                                 seq_puts(m, "\t[RECONNECTING] ");
 543
 544                         if (ses->chan_count > 1) {
 545                                 seq_printf(m, "\n\n\tExtra Channels: %zu ",
 546                                            ses->chan_count-1);
 547                                 for (j = 1; j < ses->chan_count; j++) {
 548                                         cifs_dump_channel(m, j, &ses->chans[j]);
 549                                         if (CIFS_CHAN_NEEDS_RECONNECT(ses, j))
 550                                                 seq_puts(m, "\tDISCONNECTED ");
 551                                         if (CIFS_CHAN_IN_RECONNECT(ses, j))
 552                                                 seq_puts(m, "\t[RECONNECTING] ");
 553                                 }
 554                         }
 555                         spin_unlock(&ses->chan_lock);
 556
 557                         seq_puts(m, "\n\n\tShares: ");
 558                         j = 0;
 559
 560                         seq_printf(m, "\n\t%d) IPC: ", j);
 561                         if (ses->tcon_ipc)
 562                                 cifs_debug_tcon(m, ses->tcon_ipc);
 563                         else
 564                                 seq_puts(m, "none\n");
 565
 566                         list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
 567                                 ++j;
 568                                 seq_printf(m, "\n\t%d) ", j);
 569                                 cifs_debug_tcon(m, tcon);
 570                         }
 571
 572                         spin_lock(&ses->iface_lock);
 573                         if (ses->iface_count)
 574                                 seq_printf(m, "\n\n\tServer interfaces: %zu"
 575                                            "\tLast updated: %lu seconds ago",
 576                                            ses->iface_count,
 577                                            (jiffies - ses->iface_last_update) / HZ);
 578
 579                         last_iface = list_last_entry(&ses->iface_list,
 580                                                      struct cifs_server_iface,
 581                                                      iface_head);
 582                         iface_min_speed = last_iface->speed;
 583
 584                         j = 0;
 585                         list_for_each_entry(iface, &ses->iface_list,
 586                                                  iface_head) {
 587                                 seq_printf(m, "\n\t%d)", ++j);
 588                                 cifs_dump_iface(m, iface);
 589
 590                                 iface_weight = iface->speed / iface_min_speed;
 591                                 seq_printf(m, "\t\tWeight (cur,total): (%zu,%zu)"
 592                                            "\n\t\tAllocated channels: %u\n",
 593                                            iface->weight_fulfilled,
 594                                            iface_weight,
 595                                            iface->num_channels);
 596
 597                                 if (is_ses_using_iface(ses, iface))
 598                                         seq_puts(m, "\t\t[CONNECTED]\n");
 599                         }
 600                         spin_unlock(&ses->iface_lock);
 601
 602                         seq_puts(m, "\n\n\tMIDs: ");
 603                         spin_lock(&ses->chan_lock);
 604                         for (j = 0; j < ses->chan_count; j++) {
 605                                 chan_server = ses->chans[j].server;
 606                                 if (!chan_server)
 607                                         continue;
 608
 609                                 if (list_empty(&chan_server->pending_mid_q))
 610                                         continue;
 611
 612                                 seq_printf(m, "\n\tServer ConnectionId: 0x%llx",
 613                                            chan_server->conn_id);
 614                                 spin_lock(&chan_server->mid_lock);
 615                                 list_for_each_entry(mid_entry, &chan_server->pending_mid_q, qhead) {
 616                                         seq_printf(m, "\n\t\tState: %d com: %d pid: %d cbdata: %p mid %llu",
 617                                                    mid_entry->mid_state,
 618                                                    le16_to_cpu(mid_entry->command),
 619                                                    mid_entry->pid,
 620                                                    mid_entry->callback_data,
 621                                                    mid_entry->mid);
 622                                 }
 623                                 spin_unlock(&chan_server->mid_lock);
 624                         }
 625                         spin_unlock(&ses->chan_lock);
 626                         seq_puts(m, "\n--\n");
 627                 }
 628                 if (i == 0)
 629                         seq_printf(m, "\n\t\t[NONE]");
 630         }
 631         if (c == 0)
 632                 seq_printf(m, "\n\t[NONE]");
 633
 634         spin_unlock(&cifs_tcp_ses_lock);
 635         seq_putc(m, '\n');
 636         cifs_swn_dump(m);
 637
 638         /* BB add code to dump additional info such as TCP session info now */
 639         return 0;
 640 }
 641
 642 static ssize_t cifs_stats_proc_write(struct file *file,
 643                 const char __user *buffer, size_t count, loff_t *ppos)
 644 {
 645         bool bv;
 646         int rc;
 647         struct TCP_Server_Info *server;
 648         struct cifs_ses *ses;
 649         struct cifs_tcon *tcon;
 650
 651         rc = kstrtobool_from_user(buffer, count, &bv);
 652         if (rc == 0) {
 653 #ifdef CONFIG_CIFS_STATS2
 654                 int i;
 655
 656                 atomic_set(&total_buf_alloc_count, 0);
 657                 atomic_set(&total_small_buf_alloc_count, 0);
 658 #endif /* CONFIG_CIFS_STATS2 */
 659                 atomic_set(&tcpSesReconnectCount, 0);
 660                 atomic_set(&tconInfoReconnectCount, 0);
 661
 662                 spin_lock(&GlobalMid_Lock);
 663                 GlobalMaxActiveXid = 0;
 664                 GlobalCurrentXid = 0;
 665                 spin_unlock(&GlobalMid_Lock);
 666                 spin_lock(&cifs_tcp_ses_lock);
 667                 list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
 668                         server->max_in_flight = 0;
 669 #ifdef CONFIG_CIFS_STATS2
 670                         for (i = 0; i < NUMBER_OF_SMB2_COMMANDS; i++) {
 671                                 atomic_set(&server->num_cmds[i], 0);
 672                                 atomic_set(&server->smb2slowcmd[i], 0);
 673                                 server->time_per_cmd[i] = 0;
 674                                 server->slowest_cmd[i] = 0;
 675                                 server->fastest_cmd[0] = 0;
 676                         }
 677 #endif /* CONFIG_CIFS_STATS2 */
 678                         list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
 679                                 list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
 680                                         atomic_set(&tcon->num_smbs_sent, 0);
 681                                         spin_lock(&tcon->stat_lock);
 682                                         tcon->bytes_read = 0;
 683                                         tcon->bytes_written = 0;
 684                                         tcon->stats_from_time = ktime_get_real_seconds();
 685                                         spin_unlock(&tcon->stat_lock);
 686                                         if (server->ops->clear_stats)
 687                                                 server->ops->clear_stats(tcon);
 688                                 }
 689                         }
 690                 }
 691                 spin_unlock(&cifs_tcp_ses_lock);
 692         } else {
 693                 return rc;
 694         }
 695
 696         return count;
 697 }
 698
 699 static int cifs_stats_proc_show(struct seq_file *m, void *v)
 700 {
 701         int i;
 702 #ifdef CONFIG_CIFS_STATS2
 703         int j;
 704 #endif /* STATS2 */
 705         struct TCP_Server_Info *server;
 706         struct cifs_ses *ses;
 707         struct cifs_tcon *tcon;
 708
 709         seq_printf(m, "Resources in use\nCIFS Session: %d\n",
 710                         sesInfoAllocCount.counter);
 711         seq_printf(m, "Share (unique mount targets): %d\n",
 712                         tconInfoAllocCount.counter);
 713         seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 714                         buf_alloc_count.counter,
 715                         cifs_min_rcv + tcpSesAllocCount.counter);
 716         seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 717                         small_buf_alloc_count.counter, cifs_min_small);
 718 #ifdef CONFIG_CIFS_STATS2
 719         seq_printf(m, "Total Large %d Small %d Allocations\n",
 720                                 atomic_read(&total_buf_alloc_count),
 721                                 atomic_read(&total_small_buf_alloc_count));
 722 #endif /* CONFIG_CIFS_STATS2 */
 723
 724         seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&mid_count));
 725         seq_printf(m,
 726                 "\n%d session %d share reconnects\n",
 727                 tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 728
 729         seq_printf(m,
 730                 "Total vfs operations: %d maximum at one time: %d\n",
 731                 GlobalCurrentXid, GlobalMaxActiveXid);
 732
 733         i = 0;
 734         spin_lock(&cifs_tcp_ses_lock);
 735         list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) {
 736                 seq_printf(m, "\nMax requests in flight: %d", server->max_in_flight);
 737 #ifdef CONFIG_CIFS_STATS2
 738                 seq_puts(m, "\nTotal time spent processing by command. Time ");
 739                 seq_printf(m, "units are jiffies (%d per second)\n", HZ);
 740                 seq_puts(m, "  SMB3 CMD\tNumber\tTotal Time\tFastest\tSlowest\n");
 741                 seq_puts(m, "  --------\t------\t----------\t-------\t-------\n");
 742                 for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
 743                         seq_printf(m, "  %d\t\t%d\t%llu\t\t%u\t%u\n", j,
 744                                 atomic_read(&server->num_cmds[j]),
 745                                 server->time_per_cmd[j],
 746                                 server->fastest_cmd[j],
 747                                 server->slowest_cmd[j]);
 748                 for (j = 0; j < NUMBER_OF_SMB2_COMMANDS; j++)
 749                         if (atomic_read(&server->smb2slowcmd[j])) {
 750                                 spin_lock(&server->srv_lock);
 751                                 seq_printf(m, "  %d slow responses from %s for command %d\n",
 752                                         atomic_read(&server->smb2slowcmd[j]),
 753                                         server->hostname, j);
 754                                 spin_unlock(&server->srv_lock);
 755                         }
 756 #endif /* STATS2 */
 757                 list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
 758                         list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
 759                                 i++;
 760                                 seq_printf(m, "\n%d) %s", i, tcon->tree_name);
 761                                 if (tcon->need_reconnect)
 762                                         seq_puts(m, "\tDISCONNECTED ");
 763                                 seq_printf(m, "\nSMBs: %d since %ptTs UTC",
 764                                            atomic_read(&tcon->num_smbs_sent),
 765                                            &tcon->stats_from_time);
 766                                 if (server->ops->print_stats)
 767                                         server->ops->print_stats(m, tcon);
 768                         }
 769                 }
 770         }
 771         spin_unlock(&cifs_tcp_ses_lock);
 772
 773         seq_putc(m, '\n');
 774         return 0;
 775 }
 776
 777 static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 778 {
 779         return single_open(file, cifs_stats_proc_show, NULL);
 780 }
 781
 782 static const struct proc_ops cifs_stats_proc_ops = {
 783         .proc_open      = cifs_stats_proc_open,
 784         .proc_read      = seq_read,
 785         .proc_lseek     = seq_lseek,
 786         .proc_release   = single_release,
 787         .proc_write     = cifs_stats_proc_write,
 788 };
 789
 790 #ifdef CONFIG_CIFS_SMB_DIRECT
 791 #define PROC_FILE_DEFINE(name) \
 792 static ssize_t name##_write(struct file *file, const char __user *buffer, \
 793         size_t count, loff_t *ppos) \
 794 { \
 795         int rc; \
 796         rc = kstrtoint_from_user(buffer, count, 10, &name); \
 797         if (rc) \
 798                 return rc; \
 799         return count; \
 800 } \
 801 static int name##_proc_show(struct seq_file *m, void *v) \
 802 { \
 803         seq_printf(m, "%d\n", name); \
 804         return 0; \
 805 } \
 806 static int name##_open(struct inode *inode, struct file *file) \
 807 { \
 808         return single_open(file, name##_proc_show, NULL); \
 809 } \
 810 \
 811 static const struct proc_ops cifs_##name##_proc_fops = { \
 812         .proc_open      = name##_open, \
 813         .proc_read      = seq_read, \
 814         .proc_lseek     = seq_lseek, \
 815         .proc_release   = single_release, \
 816         .proc_write     = name##_write, \
 817 }
 818
 819 PROC_FILE_DEFINE(rdma_readwrite_threshold);
 820 PROC_FILE_DEFINE(smbd_max_frmr_depth);
 821 PROC_FILE_DEFINE(smbd_keep_alive_interval);
 822 PROC_FILE_DEFINE(smbd_max_receive_size);
 823 PROC_FILE_DEFINE(smbd_max_fragmented_recv_size);
 824 PROC_FILE_DEFINE(smbd_max_send_size);
 825 PROC_FILE_DEFINE(smbd_send_credit_target);
 826 PROC_FILE_DEFINE(smbd_receive_credit_max);
 827 #endif
 828
 829 static struct proc_dir_entry *proc_fs_cifs;
 830 static const struct proc_ops cifsFYI_proc_ops;
 831 static const struct proc_ops cifs_lookup_cache_proc_ops;
 832 static const struct proc_ops traceSMB_proc_ops;
 833 static const struct proc_ops cifs_security_flags_proc_ops;
 834 static const struct proc_ops cifs_linux_ext_proc_ops;
 835 static const struct proc_ops cifs_mount_params_proc_ops;
 836
 837 void
 838 cifs_proc_init(void)
 839 {
 840         proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 841         if (proc_fs_cifs == NULL)
 842                 return;
 843
 844         proc_create_single("DebugData", 0, proc_fs_cifs,
 845                         cifs_debug_data_proc_show);
 846
 847         proc_create_single("open_files", 0400, proc_fs_cifs,
 848                         cifs_debug_files_proc_show);
 849
 850         proc_create("Stats", 0644, proc_fs_cifs, &cifs_stats_proc_ops);
 851         proc_create("cifsFYI", 0644, proc_fs_cifs, &cifsFYI_proc_ops);
 852         proc_create("traceSMB", 0644, proc_fs_cifs, &traceSMB_proc_ops);
 853         proc_create("LinuxExtensionsEnabled", 0644, proc_fs_cifs,
 854                     &cifs_linux_ext_proc_ops);
 855         proc_create("SecurityFlags", 0644, proc_fs_cifs,
 856                     &cifs_security_flags_proc_ops);
 857         proc_create("LookupCacheEnabled", 0644, proc_fs_cifs,
 858                     &cifs_lookup_cache_proc_ops);
 859
 860         proc_create("mount_params", 0444, proc_fs_cifs, &cifs_mount_params_proc_ops);
 861
 862 #ifdef CONFIG_CIFS_DFS_UPCALL
 863         proc_create("dfscache", 0644, proc_fs_cifs, &dfscache_proc_ops);
 864 #endif
 865
 866 #ifdef CONFIG_CIFS_SMB_DIRECT
 867         proc_create("rdma_readwrite_threshold", 0644, proc_fs_cifs,
 868                 &cifs_rdma_readwrite_threshold_proc_fops);
 869         proc_create("smbd_max_frmr_depth", 0644, proc_fs_cifs,
 870                 &cifs_smbd_max_frmr_depth_proc_fops);
 871         proc_create("smbd_keep_alive_interval", 0644, proc_fs_cifs,
 872                 &cifs_smbd_keep_alive_interval_proc_fops);
 873         proc_create("smbd_max_receive_size", 0644, proc_fs_cifs,
 874                 &cifs_smbd_max_receive_size_proc_fops);
 875         proc_create("smbd_max_fragmented_recv_size", 0644, proc_fs_cifs,
 876                 &cifs_smbd_max_fragmented_recv_size_proc_fops);
 877         proc_create("smbd_max_send_size", 0644, proc_fs_cifs,
 878                 &cifs_smbd_max_send_size_proc_fops);
 879         proc_create("smbd_send_credit_target", 0644, proc_fs_cifs,
 880                 &cifs_smbd_send_credit_target_proc_fops);
 881         proc_create("smbd_receive_credit_max", 0644, proc_fs_cifs,
 882                 &cifs_smbd_receive_credit_max_proc_fops);
 883 #endif
 884 }
 885
 886 void
 887 cifs_proc_clean(void)
 888 {
 889         if (proc_fs_cifs == NULL)
 890                 return;
 891
 892         remove_proc_entry("DebugData", proc_fs_cifs);
 893         remove_proc_entry("open_files", proc_fs_cifs);
 894         remove_proc_entry("cifsFYI", proc_fs_cifs);
 895         remove_proc_entry("traceSMB", proc_fs_cifs);
 896         remove_proc_entry("Stats", proc_fs_cifs);
 897         remove_proc_entry("SecurityFlags", proc_fs_cifs);
 898         remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 899         remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 900         remove_proc_entry("mount_params", proc_fs_cifs);
 901
 902 #ifdef CONFIG_CIFS_DFS_UPCALL
 903         remove_proc_entry("dfscache", proc_fs_cifs);
 904 #endif
 905 #ifdef CONFIG_CIFS_SMB_DIRECT
 906         remove_proc_entry("rdma_readwrite_threshold", proc_fs_cifs);
 907         remove_proc_entry("smbd_max_frmr_depth", proc_fs_cifs);
 908         remove_proc_entry("smbd_keep_alive_interval", proc_fs_cifs);
 909         remove_proc_entry("smbd_max_receive_size", proc_fs_cifs);
 910         remove_proc_entry("smbd_max_fragmented_recv_size", proc_fs_cifs);
 911         remove_proc_entry("smbd_max_send_size", proc_fs_cifs);
 912         remove_proc_entry("smbd_send_credit_target", proc_fs_cifs);
 913         remove_proc_entry("smbd_receive_credit_max", proc_fs_cifs);
 914 #endif
 915         remove_proc_entry("fs/cifs", NULL);
 916 }
 917
 918 static int cifsFYI_proc_show(struct seq_file *m, void *v)
 919 {
 920         seq_printf(m, "%d\n", cifsFYI);
 921         return 0;
 922 }
 923
 924 static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 925 {
 926         return single_open(file, cifsFYI_proc_show, NULL);
 927 }
 928
 929 static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 930                 size_t count, loff_t *ppos)
 931 {
 932         char c[2] = { '\0' };
 933         bool bv;
 934         int rc;
 935
 936         rc = get_user(c[0], buffer);
 937         if (rc)
 938                 return rc;
 939         if (kstrtobool(c, &bv) == 0)
 940                 cifsFYI = bv;
 941         else if ((c[0] > '1') && (c[0] <= '9'))
 942                 cifsFYI = (int) (c[0] - '0'); /* see cifs_debug.h for meanings */
 943         else
 944                 return -EINVAL;
 945
 946         return count;
 947 }
 948
 949 static const struct proc_ops cifsFYI_proc_ops = {
 950         .proc_open      = cifsFYI_proc_open,
 951         .proc_read      = seq_read,
 952         .proc_lseek     = seq_lseek,
 953         .proc_release   = single_release,
 954         .proc_write     = cifsFYI_proc_write,
 955 };
 956
 957 static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 958 {
 959         seq_printf(m, "%d\n", linuxExtEnabled);
 960         return 0;
 961 }
 962
 963 static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 964 {
 965         return single_open(file, cifs_linux_ext_proc_show, NULL);
 966 }
 967
 968 static ssize_t cifs_linux_ext_proc_write(struct file *file,
 969                 const char __user *buffer, size_t count, loff_t *ppos)
 970 {
 971         int rc;
 972
 973         rc = kstrtobool_from_user(buffer, count, &linuxExtEnabled);
 974         if (rc)
 975                 return rc;
 976
 977         return count;
 978 }
 979
 980 static const struct proc_ops cifs_linux_ext_proc_ops = {
 981         .proc_open      = cifs_linux_ext_proc_open,
 982         .proc_read      = seq_read,
 983         .proc_lseek     = seq_lseek,
 984         .proc_release   = single_release,
 985         .proc_write     = cifs_linux_ext_proc_write,
 986 };
 987
 988 static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 989 {
 990         seq_printf(m, "%d\n", lookupCacheEnabled);
 991         return 0;
 992 }
 993
 994 static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 995 {
 996         return single_open(file, cifs_lookup_cache_proc_show, NULL);
 997 }
 998
 999 static ssize_t cifs_lookup_cache_proc_write(struct file *file,
1000                 const char __user *buffer, size_t count, loff_t *ppos)
1001 {
1002         int rc;
1003
1004         rc = kstrtobool_from_user(buffer, count, &lookupCacheEnabled);
1005         if (rc)
1006                 return rc;
1007
1008         return count;
1009 }
1010
1011 static const struct proc_ops cifs_lookup_cache_proc_ops = {
1012         .proc_open      = cifs_lookup_cache_proc_open,
1013         .proc_read      = seq_read,
1014         .proc_lseek     = seq_lseek,
1015         .proc_release   = single_release,
1016         .proc_write     = cifs_lookup_cache_proc_write,
1017 };
1018
1019 static int traceSMB_proc_show(struct seq_file *m, void *v)
1020 {
1021         seq_printf(m, "%d\n", traceSMB);
1022         return 0;
1023 }
1024
1025 static int traceSMB_proc_open(struct inode *inode, struct file *file)
1026 {
1027         return single_open(file, traceSMB_proc_show, NULL);
1028 }
1029
1030 static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
1031                 size_t count, loff_t *ppos)
1032 {
1033         int rc;
1034
1035         rc = kstrtobool_from_user(buffer, count, &traceSMB);
1036         if (rc)
1037                 return rc;
1038
1039         return count;
1040 }
1041
1042 static const struct proc_ops traceSMB_proc_ops = {
1043         .proc_open      = traceSMB_proc_open,
1044         .proc_read      = seq_read,
1045         .proc_lseek     = seq_lseek,
1046         .proc_release   = single_release,
1047         .proc_write     = traceSMB_proc_write,
1048 };
1049
1050 static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
1051 {
1052         seq_printf(m, "0x%x\n", global_secflags);
1053         return 0;
1054 }
1055
1056 static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
1057 {
1058         return single_open(file, cifs_security_flags_proc_show, NULL);
1059 }
1060
1061 /*
1062  * Ensure that if someone sets a MUST flag, that we disable all other MAY
1063  * flags except for the ones corresponding to the given MUST flag. If there are
1064  * multiple MUST flags, then try to prefer more secure ones.
1065  */
1066 static void
1067 cifs_security_flags_handle_must_flags(unsigned int *flags)
1068 {
1069         unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
1070
1071         if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
1072                 *flags = CIFSSEC_MUST_KRB5;
1073         else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
1074                 *flags = CIFSSEC_MUST_NTLMSSP;
1075         else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
1076                 *flags = CIFSSEC_MUST_NTLMV2;
1077
1078         *flags |= signflags;
1079 }
1080
1081 static ssize_t cifs_security_flags_proc_write(struct file *file,
1082                 const char __user *buffer, size_t count, loff_t *ppos)
1083 {
1084         int rc;
1085         unsigned int flags;
1086         char flags_string[12];
1087         bool bv;
1088
1089         if ((count < 1) || (count > 11))
1090                 return -EINVAL;
1091
1092         memset(flags_string, 0, 12);
1093
1094         if (copy_from_user(flags_string, buffer, count))
1095                 return -EFAULT;
1096
1097         if (count < 3) {
1098                 /* single char or single char followed by null */
1099                 if (kstrtobool(flags_string, &bv) == 0) {
1100                         global_secflags = bv ? CIFSSEC_MAX : CIFSSEC_DEF;
1101                         return count;
1102                 } else if (!isdigit(flags_string[0])) {
1103                         cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
1104                                         flags_string);
1105                         return -EINVAL;
1106                 }
1107         }
1108
1109         /* else we have a number */
1110         rc = kstrtouint(flags_string, 0, &flags);
1111         if (rc) {
1112                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
1113                                 flags_string);
1114                 return rc;
1115         }
1116
1117         cifs_dbg(FYI, "sec flags 0x%x\n", flags);
1118
1119         if (flags == 0)  {
1120                 cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
1121                 return -EINVAL;
1122         }
1123
1124         if (flags & ~CIFSSEC_MASK) {
1125                 cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
1126                          flags & ~CIFSSEC_MASK);
1127                 return -EINVAL;
1128         }
1129
1130         cifs_security_flags_handle_must_flags(&flags);
1131
1132         /* flags look ok - update the global security flags for cifs module */
1133         global_secflags = flags;
1134         if (global_secflags & CIFSSEC_MUST_SIGN) {
1135                 /* requiring signing implies signing is allowed */
1136                 global_secflags |= CIFSSEC_MAY_SIGN;
1137                 cifs_dbg(FYI, "packet signing now required\n");
1138         } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
1139                 cifs_dbg(FYI, "packet signing disabled\n");
1140         }
1141         /* BB should we turn on MAY flags for other MUST options? */
1142         return count;
1143 }
1144
1145 static const struct proc_ops cifs_security_flags_proc_ops = {
1146         .proc_open      = cifs_security_flags_proc_open,
1147         .proc_read      = seq_read,
1148         .proc_lseek     = seq_lseek,
1149         .proc_release   = single_release,
1150         .proc_write     = cifs_security_flags_proc_write,
1151 };
1152
1153 /* To make it easier to debug, can help to show mount params */
1154 static int cifs_mount_params_proc_show(struct seq_file *m, void *v)
1155 {
1156         const struct fs_parameter_spec *p;
1157         const char *type;
1158
1159         for (p = smb3_fs_parameters; p->name; p++) {
1160                 /* cannot use switch with pointers... */
1161                 if (!p->type) {
1162                         if (p->flags == fs_param_neg_with_no)
1163                                 type = "noflag";
1164                         else
1165                                 type = "flag";
1166                 } else if (p->type == fs_param_is_bool)
1167                         type = "bool";
1168                 else if (p->type == fs_param_is_u32)
1169                         type = "u32";
1170                 else if (p->type == fs_param_is_u64)
1171                         type = "u64";
1172                 else if (p->type == fs_param_is_string)
1173                         type = "string";
1174                 else
1175                         type = "unknown";
1176
1177                 seq_printf(m, "%s:%s\n", p->name, type);
1178         }
1179
1180         return 0;
1181 }
1182
1183 static int cifs_mount_params_proc_open(struct inode *inode, struct file *file)
1184 {
1185         return single_open(file, cifs_mount_params_proc_show, NULL);
1186 }
1187
1188 static const struct proc_ops cifs_mount_params_proc_ops = {
1189         .proc_open      = cifs_mount_params_proc_open,
1190         .proc_read      = seq_read,
1191         .proc_lseek     = seq_lseek,
1192         .proc_release   = single_release,
1193         /* No need for write for now */
1194         /* .proc_write  = cifs_mount_params_proc_write, */
1195 };
1196
1197 #else
1198 inline void cifs_proc_init(void)
1199 {
1200 }
1201
1202 inline void cifs_proc_clean(void)
1203 {
1204 }
1205 #endif /* PROC_FS */