fs/nfsd/nfsctl.c

   1 /*
   2  * linux/fs/nfsd/nfsctl.c
   3  *
   4  * Syscall interface to knfsd.
   5  *
   6  * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/module.h>
  11
  12 #include <linux/linkage.h>
  13 #include <linux/time.h>
  14 #include <linux/errno.h>
  15 #include <linux/fs.h>
  16 #include <linux/fcntl.h>
  17 #include <linux/net.h>
  18 #include <linux/in.h>
  19 #include <linux/syscalls.h>
  20 #include <linux/unistd.h>
  21 #include <linux/slab.h>
  22 #include <linux/proc_fs.h>
  23 #include <linux/seq_file.h>
  24 #include <linux/pagemap.h>
  25 #include <linux/init.h>
  26 #include <linux/string.h>
  27
  28 #include <linux/nfs.h>
  29 #include <linux/nfsd_idmap.h>
  30 #include <linux/sunrpc/svc.h>
  31 #include <linux/nfsd/nfsd.h>
  32 #include <linux/nfsd/cache.h>
  33 #include <linux/nfsd/xdr.h>
  34 #include <linux/nfsd/syscall.h>
  35 #include <linux/nfsd/interface.h>
  36
  37 #include <asm/uaccess.h>
  38
  39 unsigned int nfsd_versbits = ~0;
  40
  41 /*
  42  *      We have a single directory with 9 nodes in it.
  43  */
  44 enum {
  45         NFSD_Root = 1,
  46         NFSD_Svc,
  47         NFSD_Add,
  48         NFSD_Del,
  49         NFSD_Export,
  50         NFSD_Unexport,
  51         NFSD_Getfd,
  52         NFSD_Getfs,
  53         NFSD_List,
  54         NFSD_Fh,
  55         NFSD_Threads,
  56         NFSD_Versions,
  57         /*
  58          * The below MUST come last.  Otherwise we leave a hole in nfsd_files[]
  59          * with !CONFIG_NFSD_V4 and simple_fill_super() goes oops
  60          */
  61 #ifdef CONFIG_NFSD_V4
  62         NFSD_Leasetime,
  63         NFSD_RecoveryDir,
  64 #endif
  65 };
  66
  67 /*
  68  * write() for these nodes.
  69  */
  70 static ssize_t write_svc(struct file *file, char *buf, size_t size);
  71 static ssize_t write_add(struct file *file, char *buf, size_t size);
  72 static ssize_t write_del(struct file *file, char *buf, size_t size);
  73 static ssize_t write_export(struct file *file, char *buf, size_t size);
  74 static ssize_t write_unexport(struct file *file, char *buf, size_t size);
  75 static ssize_t write_getfd(struct file *file, char *buf, size_t size);
  76 static ssize_t write_getfs(struct file *file, char *buf, size_t size);
  77 static ssize_t write_filehandle(struct file *file, char *buf, size_t size);
  78 static ssize_t write_threads(struct file *file, char *buf, size_t size);
  79 static ssize_t write_versions(struct file *file, char *buf, size_t size);
  80 #ifdef CONFIG_NFSD_V4
  81 static ssize_t write_leasetime(struct file *file, char *buf, size_t size);
  82 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size);
  83 #endif
  84
  85 static ssize_t (*write_op[])(struct file *, char *, size_t) = {
  86         [NFSD_Svc] = write_svc,
  87         [NFSD_Add] = write_add,
  88         [NFSD_Del] = write_del,
  89         [NFSD_Export] = write_export,
  90         [NFSD_Unexport] = write_unexport,
  91         [NFSD_Getfd] = write_getfd,
  92         [NFSD_Getfs] = write_getfs,
  93         [NFSD_Fh] = write_filehandle,
  94         [NFSD_Threads] = write_threads,
  95         [NFSD_Versions] = write_versions,
  96 #ifdef CONFIG_NFSD_V4
  97         [NFSD_Leasetime] = write_leasetime,
  98         [NFSD_RecoveryDir] = write_recoverydir,
  99 #endif
 100 };
 101
 102 static ssize_t nfsctl_transaction_write(struct file *file, const char __user *buf, size_t size, loff_t *pos)
 103 {
 104         ino_t ino =  file->f_dentry->d_inode->i_ino;
 105         char *data;
 106         ssize_t rv;
 107
 108         if (ino >= sizeof(write_op)/sizeof(write_op[0]) || !write_op[ino])
 109                 return -EINVAL;
 110
 111         data = simple_transaction_get(file, buf, size);
 112         if (IS_ERR(data))
 113                 return PTR_ERR(data);
 114
 115         rv =  write_op[ino](file, data, size);
 116         if (rv>0) {
 117                 simple_transaction_set(file, rv);
 118                 rv = size;
 119         }
 120         return rv;
 121 }
 122
 123 static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size_t size, loff_t *pos)
 124 {
 125         if (! file->private_data) {
 126                 /* An attempt to read a transaction file without writing
 127                  * causes a 0-byte write so that the file can return
 128                  * state information
 129                  */
 130                 ssize_t rv = nfsctl_transaction_write(file, buf, 0, pos);
 131                 if (rv < 0)
 132                         return rv;
 133         }
 134         return simple_transaction_read(file, buf, size, pos);
 135 }
 136
 137 static struct file_operations transaction_ops = {
 138         .write          = nfsctl_transaction_write,
 139         .read           = nfsctl_transaction_read,
 140         .release        = simple_transaction_release,
 141 };
 142
 143 extern struct seq_operations nfs_exports_op;
 144 static int exports_open(struct inode *inode, struct file *file)
 145 {
 146         return seq_open(file, &nfs_exports_op);
 147 }
 148
 149 static struct file_operations exports_operations = {
 150         .open           = exports_open,
 151         .read           = seq_read,
 152         .llseek         = seq_lseek,
 153         .release        = seq_release,
 154 };
 155
 156 /*----------------------------------------------------------------------------*/
 157 /*
 158  * payload - write methods
 159  * If the method has a response, the response should be put in buf,
 160  * and the length returned.  Otherwise return 0 or and -error.
 161  */
 162
 163 static ssize_t write_svc(struct file *file, char *buf, size_t size)
 164 {
 165         struct nfsctl_svc *data;
 166         if (size < sizeof(*data))
 167                 return -EINVAL;
 168         data = (struct nfsctl_svc*) buf;
 169         return nfsd_svc(data->svc_port, data->svc_nthreads);
 170 }
 171
 172 static ssize_t write_add(struct file *file, char *buf, size_t size)
 173 {
 174         struct nfsctl_client *data;
 175         if (size < sizeof(*data))
 176                 return -EINVAL;
 177         data = (struct nfsctl_client *)buf;
 178         return exp_addclient(data);
 179 }
 180
 181 static ssize_t write_del(struct file *file, char *buf, size_t size)
 182 {
 183         struct nfsctl_client *data;
 184         if (size < sizeof(*data))
 185                 return -EINVAL;
 186         data = (struct nfsctl_client *)buf;
 187         return exp_delclient(data);
 188 }
 189
 190 static ssize_t write_export(struct file *file, char *buf, size_t size)
 191 {
 192         struct nfsctl_export *data;
 193         if (size < sizeof(*data))
 194                 return -EINVAL;
 195         data = (struct nfsctl_export*)buf;
 196         return exp_export(data);
 197 }
 198
 199 static ssize_t write_unexport(struct file *file, char *buf, size_t size)
 200 {
 201         struct nfsctl_export *data;
 202
 203         if (size < sizeof(*data))
 204                 return -EINVAL;
 205         data = (struct nfsctl_export*)buf;
 206         return exp_unexport(data);
 207 }
 208
 209 static ssize_t write_getfs(struct file *file, char *buf, size_t size)
 210 {
 211         struct nfsctl_fsparm *data;
 212         struct sockaddr_in *sin;
 213         struct auth_domain *clp;
 214         int err = 0;
 215         struct knfsd_fh *res;
 216
 217         if (size < sizeof(*data))
 218                 return -EINVAL;
 219         data = (struct nfsctl_fsparm*)buf;
 220         err = -EPROTONOSUPPORT;
 221         if (data->gd_addr.sa_family != AF_INET)
 222                 goto out;
 223         sin = (struct sockaddr_in *)&data->gd_addr;
 224         if (data->gd_maxlen > NFS3_FHSIZE)
 225                 data->gd_maxlen = NFS3_FHSIZE;
 226
 227         res = (struct knfsd_fh*)buf;
 228
 229         exp_readlock();
 230         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 231                 err = -EPERM;
 232         else {
 233                 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen);
 234                 auth_domain_put(clp);
 235         }
 236         exp_readunlock();
 237         if (err == 0)
 238                 err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base;
 239  out:
 240         return err;
 241 }
 242
 243 static ssize_t write_getfd(struct file *file, char *buf, size_t size)
 244 {
 245         struct nfsctl_fdparm *data;
 246         struct sockaddr_in *sin;
 247         struct auth_domain *clp;
 248         int err = 0;
 249         struct knfsd_fh fh;
 250         char *res;
 251
 252         if (size < sizeof(*data))
 253                 return -EINVAL;
 254         data = (struct nfsctl_fdparm*)buf;
 255         err = -EPROTONOSUPPORT;
 256         if (data->gd_addr.sa_family != AF_INET)
 257                 goto out;
 258         err = -EINVAL;
 259         if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS)
 260                 goto out;
 261
 262         res = buf;
 263         sin = (struct sockaddr_in *)&data->gd_addr;
 264         exp_readlock();
 265         if (!(clp = auth_unix_lookup(sin->sin_addr)))
 266                 err = -EPERM;
 267         else {
 268                 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE);
 269                 auth_domain_put(clp);
 270         }
 271         exp_readunlock();
 272
 273         if (err == 0) {
 274                 memset(res,0, NFS_FHSIZE);
 275                 memcpy(res, &fh.fh_base, fh.fh_size);
 276                 err = NFS_FHSIZE;
 277         }
 278  out:
 279         return err;
 280 }
 281
 282 static ssize_t write_filehandle(struct file *file, char *buf, size_t size)
 283 {
 284         /* request is:
 285          *   domain path maxsize
 286          * response is
 287          *   filehandle
 288          *
 289          * qword quoting is used, so filehandle will be \x....
 290          */
 291         char *dname, *path;
 292         int maxsize;
 293         char *mesg = buf;
 294         int len;
 295         struct auth_domain *dom;
 296         struct knfsd_fh fh;
 297
 298         if (buf[size-1] != '\n')
 299                 return -EINVAL;
 300         buf[size-1] = 0;
 301
 302         dname = mesg;
 303         len = qword_get(&mesg, dname, size);
 304         if (len <= 0) return -EINVAL;
 305
 306         path = dname+len+1;
 307         len = qword_get(&mesg, path, size);
 308         if (len <= 0) return -EINVAL;
 309
 310         len = get_int(&mesg, &maxsize);
 311         if (len)
 312                 return len;
 313
 314         if (maxsize < NFS_FHSIZE)
 315                 return -EINVAL;
 316         if (maxsize > NFS3_FHSIZE)
 317                 maxsize = NFS3_FHSIZE;
 318
 319         if (qword_get(&mesg, mesg, size)>0)
 320                 return -EINVAL;
 321
 322         /* we have all the words, they are in buf.. */
 323         dom = unix_domain_find(dname);
 324         if (!dom)
 325                 return -ENOMEM;
 326
 327         len = exp_rootfh(dom, path, &fh,  maxsize);
 328         auth_domain_put(dom);
 329         if (len)
 330                 return len;
 331
 332         mesg = buf; len = SIMPLE_TRANSACTION_LIMIT;
 333         qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size);
 334         mesg[-1] = '\n';
 335         return mesg - buf;
 336 }
 337
 338 extern int nfsd_nrthreads(void);
 339
 340 static ssize_t write_threads(struct file *file, char *buf, size_t size)
 341 {
 342         /* if size > 0, look for a number of threads and call nfsd_svc
 343          * then write out number of threads as reply
 344          */
 345         char *mesg = buf;
 346         int rv;
 347         if (size > 0) {
 348                 int newthreads;
 349                 rv = get_int(&mesg, &newthreads);
 350                 if (rv)
 351                         return rv;
 352                 if (newthreads <0)
 353                         return -EINVAL;
 354                 rv = nfsd_svc(2049, newthreads);
 355                 if (rv)
 356                         return rv;
 357         }
 358         sprintf(buf, "%d\n", nfsd_nrthreads());
 359         return strlen(buf);
 360 }
 361
 362 static ssize_t write_versions(struct file *file, char *buf, size_t size)
 363 {
 364         /*
 365          * Format:
 366          *   [-/+]vers [-/+]vers ...
 367          */
 368         char *mesg = buf;
 369         char *vers, sign;
 370         int len, num;
 371         ssize_t tlen = 0;
 372         char *sep;
 373
 374         if (size>0) {
 375                 if (nfsd_serv)
 376                         return -EBUSY;
 377                 if (buf[size-1] != '\n')
 378                         return -EINVAL;
 379                 buf[size-1] = 0;
 380
 381                 vers = mesg;
 382                 len = qword_get(&mesg, vers, size);
 383                 if (len <= 0) return -EINVAL;
 384                 do {
 385                         sign = *vers;
 386                         if (sign == '+' || sign == '-')
 387                                 num = simple_strtol((vers+1), NULL, 0);
 388                         else
 389                                 num = simple_strtol(vers, NULL, 0);
 390                         switch(num) {
 391                         case 2:
 392                         case 3:
 393                         case 4:
 394                                 if (sign != '-')
 395                                         NFSCTL_VERSET(nfsd_versbits, num);
 396                                 else
 397                                         NFSCTL_VERUNSET(nfsd_versbits, num);
 398                                 break;
 399                         default:
 400                                 return -EINVAL;
 401                         }
 402                         vers += len + 1;
 403                         tlen += len;
 404                 } while ((len = qword_get(&mesg, vers, size)) > 0);
 405                 /* If all get turned off, turn them back on, as
 406                  * having no versions is BAD
 407                  */
 408                 if ((nfsd_versbits & NFSCTL_VERALL)==0)
 409                         nfsd_versbits = NFSCTL_VERALL;
 410         }
 411         /* Now write current state into reply buffer */
 412         len = 0;
 413         sep = "";
 414         for (num=2 ; num <= 4 ; num++)
 415                 if (NFSCTL_VERISSET(NFSCTL_VERALL, num)) {
 416                         len += sprintf(buf+len, "%s%c%d", sep,
 417                                        NFSCTL_VERISSET(nfsd_versbits, num)?'+':'-',
 418                                        num);
 419                         sep = " ";
 420                 }
 421         len += sprintf(buf+len, "\n");
 422         return len;
 423 }
 424
 425 #ifdef CONFIG_NFSD_V4
 426 extern time_t nfs4_leasetime(void);
 427
 428 static ssize_t write_leasetime(struct file *file, char *buf, size_t size)
 429 {
 430         /* if size > 10 seconds, call
 431          * nfs4_reset_lease() then write out the new lease (seconds) as reply
 432          */
 433         char *mesg = buf;
 434         int rv;
 435
 436         if (size > 0) {
 437                 int lease;
 438                 rv = get_int(&mesg, &lease);
 439                 if (rv)
 440                         return rv;
 441                 if (lease < 10 || lease > 3600)
 442                         return -EINVAL;
 443                 nfs4_reset_lease(lease);
 444         }
 445         sprintf(buf, "%ld\n", nfs4_lease_time());
 446         return strlen(buf);
 447 }
 448
 449 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size)
 450 {
 451         char *mesg = buf;
 452         char *recdir;
 453         int len, status;
 454
 455         if (size > PATH_MAX || buf[size-1] != '\n')
 456                 return -EINVAL;
 457         buf[size-1] = 0;
 458
 459         recdir = mesg;
 460         len = qword_get(&mesg, recdir, size);
 461         if (len <= 0)
 462                 return -EINVAL;
 463
 464         status = nfs4_reset_recoverydir(recdir);
 465         return strlen(buf);
 466 }
 467 #endif
 468
 469 /*----------------------------------------------------------------------------*/
 470 /*
 471  *      populating the filesystem.
 472  */
 473
 474 static int nfsd_fill_super(struct super_block * sb, void * data, int silent)
 475 {
 476         static struct tree_descr nfsd_files[] = {
 477                 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR},
 478                 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR},
 479                 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR},
 480                 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR},
 481                 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR},
 482                 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR},
 483                 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR},
 484                 [NFSD_List] = {"exports", &exports_operations, S_IRUGO},
 485                 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR},
 486                 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR},
 487                 [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR},
 488 #ifdef CONFIG_NFSD_V4
 489                 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR},
 490                 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR},
 491 #endif
 492                 /* last one */ {""}
 493         };
 494         return simple_fill_super(sb, 0x6e667364, nfsd_files);
 495 }
 496
 497 static struct super_block *nfsd_get_sb(struct file_system_type *fs_type,
 498         int flags, const char *dev_name, void *data)
 499 {
 500         return get_sb_single(fs_type, flags, data, nfsd_fill_super);
 501 }
 502
 503 static struct file_system_type nfsd_fs_type = {
 504         .owner          = THIS_MODULE,
 505         .name           = "nfsd",
 506         .get_sb         = nfsd_get_sb,
 507         .kill_sb        = kill_litter_super,
 508 };
 509
 510 static int __init init_nfsd(void)
 511 {
 512         int retval;
 513         printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n");
 514
 515         nfsd_stat_init();       /* Statistics */
 516         nfsd_cache_init();      /* RPC reply cache */
 517         nfsd_export_init();     /* Exports table */
 518         nfsd_lockd_init();      /* lockd->nfsd callbacks */
 519         nfs4_state_init();      /* NFSv4 locking state */
 520         nfsd_idmap_init();      /* Name to ID mapping */
 521         if (proc_mkdir("fs/nfs", NULL)) {
 522                 struct proc_dir_entry *entry;
 523                 entry = create_proc_entry("fs/nfs/exports", 0, NULL);
 524                 if (entry)
 525                         entry->proc_fops =  &exports_operations;
 526         }
 527         retval = register_filesystem(&nfsd_fs_type);
 528         if (retval) {
 529                 nfsd_export_shutdown();
 530                 nfsd_cache_shutdown();
 531                 remove_proc_entry("fs/nfs/exports", NULL);
 532                 remove_proc_entry("fs/nfs", NULL);
 533                 nfsd_stat_shutdown();
 534                 nfsd_lockd_shutdown();
 535         }
 536         return retval;
 537 }
 538
 539 static void __exit exit_nfsd(void)
 540 {
 541         nfsd_export_shutdown();
 542         nfsd_cache_shutdown();
 543         remove_proc_entry("fs/nfs/exports", NULL);
 544         remove_proc_entry("fs/nfs", NULL);
 545         nfsd_stat_shutdown();
 546         nfsd_lockd_shutdown();
 547         nfsd_idmap_shutdown();
 548         unregister_filesystem(&nfsd_fs_type);
 549 }
 550
 551 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
 552 MODULE_LICENSE("GPL");
 553 module_init(init_nfsd)
 554 module_exit(exit_nfsd)