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