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