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