linux/fs/cifs/cifs_debug.c
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   1/*
   2 *   fs/cifs_debug.c
   3 *
   4 *   Copyright (C) International Business Machines  Corp., 2000,2005
   5 *
   6 *   Modified by Steve French (sfrench@us.ibm.com)
   7 *
   8 *   This program is free software;  you can redistribute it and/or modify
   9 *   it under the terms of the GNU General Public License as published by
  10 *   the Free Software Foundation; either version 2 of the License, or
  11 *   (at your option) any later version.
  12 *
  13 *   This program is distributed in the hope that it will be useful,
  14 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  16 *   the GNU General Public License for more details.
  17 *
  18 *   You should have received a copy of the GNU General Public License
  19 *   along with this program;  if not, write to the Free Software
  20 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21 */
  22#include <linux/fs.h>
  23#include <linux/string.h>
  24#include <linux/ctype.h>
  25#include <linux/module.h>
  26#include <linux/proc_fs.h>
  27#include <asm/uaccess.h>
  28#include "cifspdu.h"
  29#include "cifsglob.h"
  30#include "cifsproto.h"
  31#include "cifs_debug.h"
  32#include "cifsfs.h"
  33
  34void
  35cifs_dump_mem(char *label, void *data, int length)
  36{
  37        int i, j;
  38        int *intptr = data;
  39        char *charptr = data;
  40        char buf[10], line[80];
  41
  42        printk(KERN_DEBUG "%s: dump of %d bytes of data at 0x%p\n",
  43                label, length, data);
  44        for (i = 0; i < length; i += 16) {
  45                line[0] = 0;
  46                for (j = 0; (j < 4) && (i + j * 4 < length); j++) {
  47                        sprintf(buf, " %08x", intptr[i / 4 + j]);
  48                        strcat(line, buf);
  49                }
  50                buf[0] = ' ';
  51                buf[2] = 0;
  52                for (j = 0; (j < 16) && (i + j < length); j++) {
  53                        buf[1] = isprint(charptr[i + j]) ? charptr[i + j] : '.';
  54                        strcat(line, buf);
  55                }
  56                printk(KERN_DEBUG "%s\n", line);
  57        }
  58}
  59
  60#ifdef CONFIG_CIFS_DEBUG
  61void cifs_vfs_err(const char *fmt, ...)
  62{
  63        struct va_format vaf;
  64        va_list args;
  65
  66        va_start(args, fmt);
  67
  68        vaf.fmt = fmt;
  69        vaf.va = &args;
  70
  71        printk(KERN_ERR "CIFS VFS: %pV", &vaf);
  72
  73        va_end(args);
  74}
  75#endif
  76
  77void cifs_dump_detail(void *buf)
  78{
  79#ifdef CONFIG_CIFS_DEBUG2
  80        struct smb_hdr *smb = (struct smb_hdr *)buf;
  81
  82        cifs_dbg(VFS, "Cmd: %d Err: 0x%x Flags: 0x%x Flgs2: 0x%x Mid: %d Pid: %d\n",
  83                 smb->Command, smb->Status.CifsError,
  84                 smb->Flags, smb->Flags2, smb->Mid, smb->Pid);
  85        cifs_dbg(VFS, "smb buf %p len %u\n", smb, smbCalcSize(smb));
  86#endif /* CONFIG_CIFS_DEBUG2 */
  87}
  88
  89void cifs_dump_mids(struct TCP_Server_Info *server)
  90{
  91#ifdef CONFIG_CIFS_DEBUG2
  92        struct list_head *tmp;
  93        struct mid_q_entry *mid_entry;
  94
  95        if (server == NULL)
  96                return;
  97
  98        cifs_dbg(VFS, "Dump pending requests:\n");
  99        spin_lock(&GlobalMid_Lock);
 100        list_for_each(tmp, &server->pending_mid_q) {
 101                mid_entry = list_entry(tmp, struct mid_q_entry, qhead);
 102                cifs_dbg(VFS, "State: %d Cmd: %d Pid: %d Cbdata: %p Mid %llu\n",
 103                         mid_entry->mid_state,
 104                         le16_to_cpu(mid_entry->command),
 105                         mid_entry->pid,
 106                         mid_entry->callback_data,
 107                         mid_entry->mid);
 108#ifdef CONFIG_CIFS_STATS2
 109                cifs_dbg(VFS, "IsLarge: %d buf: %p time rcv: %ld now: %ld\n",
 110                         mid_entry->large_buf,
 111                         mid_entry->resp_buf,
 112                         mid_entry->when_received,
 113                         jiffies);
 114#endif /* STATS2 */
 115                cifs_dbg(VFS, "IsMult: %d IsEnd: %d\n",
 116                         mid_entry->multiRsp, mid_entry->multiEnd);
 117                if (mid_entry->resp_buf) {
 118                        cifs_dump_detail(mid_entry->resp_buf);
 119                        cifs_dump_mem("existing buf: ",
 120                                mid_entry->resp_buf, 62);
 121                }
 122        }
 123        spin_unlock(&GlobalMid_Lock);
 124#endif /* CONFIG_CIFS_DEBUG2 */
 125}
 126
 127#ifdef CONFIG_PROC_FS
 128static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 129{
 130        struct list_head *tmp1, *tmp2, *tmp3;
 131        struct mid_q_entry *mid_entry;
 132        struct TCP_Server_Info *server;
 133        struct cifs_ses *ses;
 134        struct cifs_tcon *tcon;
 135        int i, j;
 136        __u32 dev_type;
 137
 138        seq_puts(m,
 139                    "Display Internal CIFS Data Structures for Debugging\n"
 140                    "---------------------------------------------------\n");
 141        seq_printf(m, "CIFS Version %s\n", CIFS_VERSION);
 142        seq_printf(m, "Features:");
 143#ifdef CONFIG_CIFS_DFS_UPCALL
 144        seq_printf(m, " dfs");
 145#endif
 146#ifdef CONFIG_CIFS_FSCACHE
 147        seq_printf(m, " fscache");
 148#endif
 149#ifdef CONFIG_CIFS_WEAK_PW_HASH
 150        seq_printf(m, " lanman");
 151#endif
 152#ifdef CONFIG_CIFS_POSIX
 153        seq_printf(m, " posix");
 154#endif
 155#ifdef CONFIG_CIFS_UPCALL
 156        seq_printf(m, " spnego");
 157#endif
 158#ifdef CONFIG_CIFS_XATTR
 159        seq_printf(m, " xattr");
 160#endif
 161#ifdef CONFIG_CIFS_ACL
 162        seq_printf(m, " acl");
 163#endif
 164        seq_putc(m, '\n');
 165        seq_printf(m, "Active VFS Requests: %d\n", GlobalTotalActiveXid);
 166        seq_printf(m, "Servers:");
 167
 168        i = 0;
 169        spin_lock(&cifs_tcp_ses_lock);
 170        list_for_each(tmp1, &cifs_tcp_ses_list) {
 171                server = list_entry(tmp1, struct TCP_Server_Info,
 172                                    tcp_ses_list);
 173                i++;
 174                list_for_each(tmp2, &server->smb_ses_list) {
 175                        ses = list_entry(tmp2, struct cifs_ses,
 176                                         smb_ses_list);
 177                        if ((ses->serverDomain == NULL) ||
 178                                (ses->serverOS == NULL) ||
 179                                (ses->serverNOS == NULL)) {
 180                                seq_printf(m, "\n%d) entry for %s not fully "
 181                                           "displayed\n\t", i, ses->serverName);
 182                        } else {
 183                                seq_printf(m,
 184                                    "\n%d) Name: %s  Domain: %s Uses: %d OS:"
 185                                    " %s\n\tNOS: %s\tCapability: 0x%x\n\tSMB"
 186                                    " session status: %d\t",
 187                                i, ses->serverName, ses->serverDomain,
 188                                ses->ses_count, ses->serverOS, ses->serverNOS,
 189                                ses->capabilities, ses->status);
 190                        }
 191                        seq_printf(m, "TCP status: %d\n\tLocal Users To "
 192                                   "Server: %d SecMode: 0x%x Req On Wire: %d",
 193                                   server->tcpStatus, server->srv_count,
 194                                   server->sec_mode, in_flight(server));
 195
 196#ifdef CONFIG_CIFS_STATS2
 197                        seq_printf(m, " In Send: %d In MaxReq Wait: %d",
 198                                atomic_read(&server->in_send),
 199                                atomic_read(&server->num_waiters));
 200#endif
 201
 202                        seq_puts(m, "\n\tShares:");
 203                        j = 0;
 204                        list_for_each(tmp3, &ses->tcon_list) {
 205                                tcon = list_entry(tmp3, struct cifs_tcon,
 206                                                  tcon_list);
 207                                ++j;
 208                                dev_type = le32_to_cpu(tcon->fsDevInfo.DeviceType);
 209                                seq_printf(m, "\n\t%d) %s Mounts: %d ", j,
 210                                           tcon->treeName, tcon->tc_count);
 211                                if (tcon->nativeFileSystem) {
 212                                        seq_printf(m, "Type: %s ",
 213                                                   tcon->nativeFileSystem);
 214                                }
 215                                seq_printf(m, "DevInfo: 0x%x Attributes: 0x%x"
 216                                        "\n\tPathComponentMax: %d Status: 0x%d",
 217                                        le32_to_cpu(tcon->fsDevInfo.DeviceCharacteristics),
 218                                        le32_to_cpu(tcon->fsAttrInfo.Attributes),
 219                                        le32_to_cpu(tcon->fsAttrInfo.MaxPathNameComponentLength),
 220                                        tcon->tidStatus);
 221                                if (dev_type == FILE_DEVICE_DISK)
 222                                        seq_puts(m, " type: DISK ");
 223                                else if (dev_type == FILE_DEVICE_CD_ROM)
 224                                        seq_puts(m, " type: CDROM ");
 225                                else
 226                                        seq_printf(m, " type: %d ", dev_type);
 227                                if (server->ops->dump_share_caps)
 228                                        server->ops->dump_share_caps(m, tcon);
 229
 230                                if (tcon->need_reconnect)
 231                                        seq_puts(m, "\tDISCONNECTED ");
 232                                seq_putc(m, '\n');
 233                        }
 234
 235                        seq_puts(m, "\n\tMIDs:\n");
 236
 237                        spin_lock(&GlobalMid_Lock);
 238                        list_for_each(tmp3, &server->pending_mid_q) {
 239                                mid_entry = list_entry(tmp3, struct mid_q_entry,
 240                                        qhead);
 241                                seq_printf(m, "\tState: %d com: %d pid:"
 242                                              " %d cbdata: %p mid %llu\n",
 243                                              mid_entry->mid_state,
 244                                              le16_to_cpu(mid_entry->command),
 245                                              mid_entry->pid,
 246                                              mid_entry->callback_data,
 247                                              mid_entry->mid);
 248                        }
 249                        spin_unlock(&GlobalMid_Lock);
 250                }
 251        }
 252        spin_unlock(&cifs_tcp_ses_lock);
 253        seq_putc(m, '\n');
 254
 255        /* BB add code to dump additional info such as TCP session info now */
 256        return 0;
 257}
 258
 259static int cifs_debug_data_proc_open(struct inode *inode, struct file *file)
 260{
 261        return single_open(file, cifs_debug_data_proc_show, NULL);
 262}
 263
 264static const struct file_operations cifs_debug_data_proc_fops = {
 265        .owner          = THIS_MODULE,
 266        .open           = cifs_debug_data_proc_open,
 267        .read           = seq_read,
 268        .llseek         = seq_lseek,
 269        .release        = single_release,
 270};
 271
 272#ifdef CONFIG_CIFS_STATS
 273static ssize_t cifs_stats_proc_write(struct file *file,
 274                const char __user *buffer, size_t count, loff_t *ppos)
 275{
 276        char c;
 277        int rc;
 278        struct list_head *tmp1, *tmp2, *tmp3;
 279        struct TCP_Server_Info *server;
 280        struct cifs_ses *ses;
 281        struct cifs_tcon *tcon;
 282
 283        rc = get_user(c, buffer);
 284        if (rc)
 285                return rc;
 286
 287        if (c == '1' || c == 'y' || c == 'Y' || c == '0') {
 288#ifdef CONFIG_CIFS_STATS2
 289                atomic_set(&totBufAllocCount, 0);
 290                atomic_set(&totSmBufAllocCount, 0);
 291#endif /* CONFIG_CIFS_STATS2 */
 292                spin_lock(&cifs_tcp_ses_lock);
 293                list_for_each(tmp1, &cifs_tcp_ses_list) {
 294                        server = list_entry(tmp1, struct TCP_Server_Info,
 295                                            tcp_ses_list);
 296                        list_for_each(tmp2, &server->smb_ses_list) {
 297                                ses = list_entry(tmp2, struct cifs_ses,
 298                                                 smb_ses_list);
 299                                list_for_each(tmp3, &ses->tcon_list) {
 300                                        tcon = list_entry(tmp3,
 301                                                          struct cifs_tcon,
 302                                                          tcon_list);
 303                                        atomic_set(&tcon->num_smbs_sent, 0);
 304                                        if (server->ops->clear_stats)
 305                                                server->ops->clear_stats(tcon);
 306                                }
 307                        }
 308                }
 309                spin_unlock(&cifs_tcp_ses_lock);
 310        }
 311
 312        return count;
 313}
 314
 315static int cifs_stats_proc_show(struct seq_file *m, void *v)
 316{
 317        int i;
 318        struct list_head *tmp1, *tmp2, *tmp3;
 319        struct TCP_Server_Info *server;
 320        struct cifs_ses *ses;
 321        struct cifs_tcon *tcon;
 322
 323        seq_printf(m,
 324                        "Resources in use\nCIFS Session: %d\n",
 325                        sesInfoAllocCount.counter);
 326        seq_printf(m, "Share (unique mount targets): %d\n",
 327                        tconInfoAllocCount.counter);
 328        seq_printf(m, "SMB Request/Response Buffer: %d Pool size: %d\n",
 329                        bufAllocCount.counter,
 330                        cifs_min_rcv + tcpSesAllocCount.counter);
 331        seq_printf(m, "SMB Small Req/Resp Buffer: %d Pool size: %d\n",
 332                        smBufAllocCount.counter, cifs_min_small);
 333#ifdef CONFIG_CIFS_STATS2
 334        seq_printf(m, "Total Large %d Small %d Allocations\n",
 335                                atomic_read(&totBufAllocCount),
 336                                atomic_read(&totSmBufAllocCount));
 337#endif /* CONFIG_CIFS_STATS2 */
 338
 339        seq_printf(m, "Operations (MIDs): %d\n", atomic_read(&midCount));
 340        seq_printf(m,
 341                "\n%d session %d share reconnects\n",
 342                tcpSesReconnectCount.counter, tconInfoReconnectCount.counter);
 343
 344        seq_printf(m,
 345                "Total vfs operations: %d maximum at one time: %d\n",
 346                GlobalCurrentXid, GlobalMaxActiveXid);
 347
 348        i = 0;
 349        spin_lock(&cifs_tcp_ses_lock);
 350        list_for_each(tmp1, &cifs_tcp_ses_list) {
 351                server = list_entry(tmp1, struct TCP_Server_Info,
 352                                    tcp_ses_list);
 353                list_for_each(tmp2, &server->smb_ses_list) {
 354                        ses = list_entry(tmp2, struct cifs_ses,
 355                                         smb_ses_list);
 356                        list_for_each(tmp3, &ses->tcon_list) {
 357                                tcon = list_entry(tmp3,
 358                                                  struct cifs_tcon,
 359                                                  tcon_list);
 360                                i++;
 361                                seq_printf(m, "\n%d) %s", i, tcon->treeName);
 362                                if (tcon->need_reconnect)
 363                                        seq_puts(m, "\tDISCONNECTED ");
 364                                seq_printf(m, "\nSMBs: %d",
 365                                           atomic_read(&tcon->num_smbs_sent));
 366                                if (server->ops->print_stats)
 367                                        server->ops->print_stats(m, tcon);
 368                        }
 369                }
 370        }
 371        spin_unlock(&cifs_tcp_ses_lock);
 372
 373        seq_putc(m, '\n');
 374        return 0;
 375}
 376
 377static int cifs_stats_proc_open(struct inode *inode, struct file *file)
 378{
 379        return single_open(file, cifs_stats_proc_show, NULL);
 380}
 381
 382static const struct file_operations cifs_stats_proc_fops = {
 383        .owner          = THIS_MODULE,
 384        .open           = cifs_stats_proc_open,
 385        .read           = seq_read,
 386        .llseek         = seq_lseek,
 387        .release        = single_release,
 388        .write          = cifs_stats_proc_write,
 389};
 390#endif /* STATS */
 391
 392static struct proc_dir_entry *proc_fs_cifs;
 393static const struct file_operations cifsFYI_proc_fops;
 394static const struct file_operations cifs_lookup_cache_proc_fops;
 395static const struct file_operations traceSMB_proc_fops;
 396static const struct file_operations cifs_security_flags_proc_fops;
 397static const struct file_operations cifs_linux_ext_proc_fops;
 398
 399void
 400cifs_proc_init(void)
 401{
 402        proc_fs_cifs = proc_mkdir("fs/cifs", NULL);
 403        if (proc_fs_cifs == NULL)
 404                return;
 405
 406        proc_create("DebugData", 0, proc_fs_cifs, &cifs_debug_data_proc_fops);
 407
 408#ifdef CONFIG_CIFS_STATS
 409        proc_create("Stats", 0, proc_fs_cifs, &cifs_stats_proc_fops);
 410#endif /* STATS */
 411        proc_create("cifsFYI", 0, proc_fs_cifs, &cifsFYI_proc_fops);
 412        proc_create("traceSMB", 0, proc_fs_cifs, &traceSMB_proc_fops);
 413        proc_create("LinuxExtensionsEnabled", 0, proc_fs_cifs,
 414                    &cifs_linux_ext_proc_fops);
 415        proc_create("SecurityFlags", 0, proc_fs_cifs,
 416                    &cifs_security_flags_proc_fops);
 417        proc_create("LookupCacheEnabled", 0, proc_fs_cifs,
 418                    &cifs_lookup_cache_proc_fops);
 419}
 420
 421void
 422cifs_proc_clean(void)
 423{
 424        if (proc_fs_cifs == NULL)
 425                return;
 426
 427        remove_proc_entry("DebugData", proc_fs_cifs);
 428        remove_proc_entry("cifsFYI", proc_fs_cifs);
 429        remove_proc_entry("traceSMB", proc_fs_cifs);
 430#ifdef CONFIG_CIFS_STATS
 431        remove_proc_entry("Stats", proc_fs_cifs);
 432#endif
 433        remove_proc_entry("SecurityFlags", proc_fs_cifs);
 434        remove_proc_entry("LinuxExtensionsEnabled", proc_fs_cifs);
 435        remove_proc_entry("LookupCacheEnabled", proc_fs_cifs);
 436        remove_proc_entry("fs/cifs", NULL);
 437}
 438
 439static int cifsFYI_proc_show(struct seq_file *m, void *v)
 440{
 441        seq_printf(m, "%d\n", cifsFYI);
 442        return 0;
 443}
 444
 445static int cifsFYI_proc_open(struct inode *inode, struct file *file)
 446{
 447        return single_open(file, cifsFYI_proc_show, NULL);
 448}
 449
 450static ssize_t cifsFYI_proc_write(struct file *file, const char __user *buffer,
 451                size_t count, loff_t *ppos)
 452{
 453        char c;
 454        int rc;
 455
 456        rc = get_user(c, buffer);
 457        if (rc)
 458                return rc;
 459        if (c == '0' || c == 'n' || c == 'N')
 460                cifsFYI = 0;
 461        else if (c == '1' || c == 'y' || c == 'Y')
 462                cifsFYI = 1;
 463        else if ((c > '1') && (c <= '9'))
 464                cifsFYI = (int) (c - '0'); /* see cifs_debug.h for meanings */
 465
 466        return count;
 467}
 468
 469static const struct file_operations cifsFYI_proc_fops = {
 470        .owner          = THIS_MODULE,
 471        .open           = cifsFYI_proc_open,
 472        .read           = seq_read,
 473        .llseek         = seq_lseek,
 474        .release        = single_release,
 475        .write          = cifsFYI_proc_write,
 476};
 477
 478static int cifs_linux_ext_proc_show(struct seq_file *m, void *v)
 479{
 480        seq_printf(m, "%d\n", linuxExtEnabled);
 481        return 0;
 482}
 483
 484static int cifs_linux_ext_proc_open(struct inode *inode, struct file *file)
 485{
 486        return single_open(file, cifs_linux_ext_proc_show, NULL);
 487}
 488
 489static ssize_t cifs_linux_ext_proc_write(struct file *file,
 490                const char __user *buffer, size_t count, loff_t *ppos)
 491{
 492        char c;
 493        int rc;
 494
 495        rc = get_user(c, buffer);
 496        if (rc)
 497                return rc;
 498        if (c == '0' || c == 'n' || c == 'N')
 499                linuxExtEnabled = 0;
 500        else if (c == '1' || c == 'y' || c == 'Y')
 501                linuxExtEnabled = 1;
 502
 503        return count;
 504}
 505
 506static const struct file_operations cifs_linux_ext_proc_fops = {
 507        .owner          = THIS_MODULE,
 508        .open           = cifs_linux_ext_proc_open,
 509        .read           = seq_read,
 510        .llseek         = seq_lseek,
 511        .release        = single_release,
 512        .write          = cifs_linux_ext_proc_write,
 513};
 514
 515static int cifs_lookup_cache_proc_show(struct seq_file *m, void *v)
 516{
 517        seq_printf(m, "%d\n", lookupCacheEnabled);
 518        return 0;
 519}
 520
 521static int cifs_lookup_cache_proc_open(struct inode *inode, struct file *file)
 522{
 523        return single_open(file, cifs_lookup_cache_proc_show, NULL);
 524}
 525
 526static ssize_t cifs_lookup_cache_proc_write(struct file *file,
 527                const char __user *buffer, size_t count, loff_t *ppos)
 528{
 529        char c;
 530        int rc;
 531
 532        rc = get_user(c, buffer);
 533        if (rc)
 534                return rc;
 535        if (c == '0' || c == 'n' || c == 'N')
 536                lookupCacheEnabled = 0;
 537        else if (c == '1' || c == 'y' || c == 'Y')
 538                lookupCacheEnabled = 1;
 539
 540        return count;
 541}
 542
 543static const struct file_operations cifs_lookup_cache_proc_fops = {
 544        .owner          = THIS_MODULE,
 545        .open           = cifs_lookup_cache_proc_open,
 546        .read           = seq_read,
 547        .llseek         = seq_lseek,
 548        .release        = single_release,
 549        .write          = cifs_lookup_cache_proc_write,
 550};
 551
 552static int traceSMB_proc_show(struct seq_file *m, void *v)
 553{
 554        seq_printf(m, "%d\n", traceSMB);
 555        return 0;
 556}
 557
 558static int traceSMB_proc_open(struct inode *inode, struct file *file)
 559{
 560        return single_open(file, traceSMB_proc_show, NULL);
 561}
 562
 563static ssize_t traceSMB_proc_write(struct file *file, const char __user *buffer,
 564                size_t count, loff_t *ppos)
 565{
 566        char c;
 567        int rc;
 568
 569        rc = get_user(c, buffer);
 570        if (rc)
 571                return rc;
 572        if (c == '0' || c == 'n' || c == 'N')
 573                traceSMB = 0;
 574        else if (c == '1' || c == 'y' || c == 'Y')
 575                traceSMB = 1;
 576
 577        return count;
 578}
 579
 580static const struct file_operations traceSMB_proc_fops = {
 581        .owner          = THIS_MODULE,
 582        .open           = traceSMB_proc_open,
 583        .read           = seq_read,
 584        .llseek         = seq_lseek,
 585        .release        = single_release,
 586        .write          = traceSMB_proc_write,
 587};
 588
 589static int cifs_security_flags_proc_show(struct seq_file *m, void *v)
 590{
 591        seq_printf(m, "0x%x\n", global_secflags);
 592        return 0;
 593}
 594
 595static int cifs_security_flags_proc_open(struct inode *inode, struct file *file)
 596{
 597        return single_open(file, cifs_security_flags_proc_show, NULL);
 598}
 599
 600/*
 601 * Ensure that if someone sets a MUST flag, that we disable all other MAY
 602 * flags except for the ones corresponding to the given MUST flag. If there are
 603 * multiple MUST flags, then try to prefer more secure ones.
 604 */
 605static void
 606cifs_security_flags_handle_must_flags(unsigned int *flags)
 607{
 608        unsigned int signflags = *flags & CIFSSEC_MUST_SIGN;
 609
 610        if ((*flags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
 611                *flags = CIFSSEC_MUST_KRB5;
 612        else if ((*flags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
 613                *flags = CIFSSEC_MUST_NTLMSSP;
 614        else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
 615                *flags = CIFSSEC_MUST_NTLMV2;
 616        else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
 617                *flags = CIFSSEC_MUST_NTLM;
 618        else if ((*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
 619                *flags = CIFSSEC_MUST_LANMAN;
 620        else if ((*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
 621                *flags = CIFSSEC_MUST_PLNTXT;
 622
 623        *flags |= signflags;
 624}
 625
 626static ssize_t cifs_security_flags_proc_write(struct file *file,
 627                const char __user *buffer, size_t count, loff_t *ppos)
 628{
 629        int rc;
 630        unsigned int flags;
 631        char flags_string[12];
 632        char c;
 633
 634        if ((count < 1) || (count > 11))
 635                return -EINVAL;
 636
 637        memset(flags_string, 0, 12);
 638
 639        if (copy_from_user(flags_string, buffer, count))
 640                return -EFAULT;
 641
 642        if (count < 3) {
 643                /* single char or single char followed by null */
 644                c = flags_string[0];
 645                if (c == '0' || c == 'n' || c == 'N') {
 646                        global_secflags = CIFSSEC_DEF; /* default */
 647                        return count;
 648                } else if (c == '1' || c == 'y' || c == 'Y') {
 649                        global_secflags = CIFSSEC_MAX;
 650                        return count;
 651                } else if (!isdigit(c)) {
 652                        cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 653                                        flags_string);
 654                        return -EINVAL;
 655                }
 656        }
 657
 658        /* else we have a number */
 659        rc = kstrtouint(flags_string, 0, &flags);
 660        if (rc) {
 661                cifs_dbg(VFS, "Invalid SecurityFlags: %s\n",
 662                                flags_string);
 663                return rc;
 664        }
 665
 666        cifs_dbg(FYI, "sec flags 0x%x\n", flags);
 667
 668        if (flags == 0)  {
 669                cifs_dbg(VFS, "Invalid SecurityFlags: %s\n", flags_string);
 670                return -EINVAL;
 671        }
 672
 673        if (flags & ~CIFSSEC_MASK) {
 674                cifs_dbg(VFS, "Unsupported security flags: 0x%x\n",
 675                         flags & ~CIFSSEC_MASK);
 676                return -EINVAL;
 677        }
 678
 679        cifs_security_flags_handle_must_flags(&flags);
 680
 681        /* flags look ok - update the global security flags for cifs module */
 682        global_secflags = flags;
 683        if (global_secflags & CIFSSEC_MUST_SIGN) {
 684                /* requiring signing implies signing is allowed */
 685                global_secflags |= CIFSSEC_MAY_SIGN;
 686                cifs_dbg(FYI, "packet signing now required\n");
 687        } else if ((global_secflags & CIFSSEC_MAY_SIGN) == 0) {
 688                cifs_dbg(FYI, "packet signing disabled\n");
 689        }
 690        /* BB should we turn on MAY flags for other MUST options? */
 691        return count;
 692}
 693
 694static const struct file_operations cifs_security_flags_proc_fops = {
 695        .owner          = THIS_MODULE,
 696        .open           = cifs_security_flags_proc_open,
 697        .read           = seq_read,
 698        .llseek         = seq_lseek,
 699        .release        = single_release,
 700        .write          = cifs_security_flags_proc_write,
 701};
 702#else
 703inline void cifs_proc_init(void)
 704{
 705}
 706
 707inline void cifs_proc_clean(void)
 708{
 709}
 710#endif /* PROC_FS */
 711
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