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 struct file_operations transaction_ops = { 108 .write = nfsctl_transaction_write, 109 .read = simple_transaction_read, 110 .release = simple_transaction_release, 111 }; 112 113 extern struct seq_operations nfs_exports_op; 114 static int exports_open(struct inode *inode, struct file *file) 115 { 116 return seq_open(file, &nfs_exports_op); 117 } 118 119 static struct file_operations exports_operations = { 120 .open = exports_open, 121 .read = seq_read, 122 .llseek = seq_lseek, 123 .release = seq_release, 124 }; 125 126 /*----------------------------------------------------------------------------*/ 127 /* 128 * payload - write methods 129 * If the method has a response, the response should be put in buf, 130 * and the length returned. Otherwise return 0 or and -error. 131 */ 132 133 static ssize_t write_svc(struct file *file, char *buf, size_t size) 134 { 135 struct nfsctl_svc *data; 136 if (size < sizeof(*data)) 137 return -EINVAL; 138 data = (struct nfsctl_svc*) buf; 139 return nfsd_svc(data->svc_port, data->svc_nthreads); 140 } 141 142 static ssize_t write_add(struct file *file, char *buf, size_t size) 143 { 144 struct nfsctl_client *data; 145 if (size < sizeof(*data)) 146 return -EINVAL; 147 data = (struct nfsctl_client *)buf; 148 return exp_addclient(data); 149 } 150 151 static ssize_t write_del(struct file *file, char *buf, size_t size) 152 { 153 struct nfsctl_client *data; 154 if (size < sizeof(*data)) 155 return -EINVAL; 156 data = (struct nfsctl_client *)buf; 157 return exp_delclient(data); 158 } 159 160 static ssize_t write_export(struct file *file, char *buf, size_t size) 161 { 162 struct nfsctl_export *data; 163 if (size < sizeof(*data)) 164 return -EINVAL; 165 data = (struct nfsctl_export*)buf; 166 return exp_export(data); 167 } 168 169 static ssize_t write_unexport(struct file *file, char *buf, size_t size) 170 { 171 struct nfsctl_export *data; 172 173 if (size < sizeof(*data)) 174 return -EINVAL; 175 data = (struct nfsctl_export*)buf; 176 return exp_unexport(data); 177 } 178 179 static ssize_t write_getfs(struct file *file, char *buf, size_t size) 180 { 181 struct nfsctl_fsparm *data; 182 struct sockaddr_in *sin; 183 struct auth_domain *clp; 184 int err = 0; 185 struct knfsd_fh *res; 186 187 if (size < sizeof(*data)) 188 return -EINVAL; 189 data = (struct nfsctl_fsparm*)buf; 190 err = -EPROTONOSUPPORT; 191 if (data->gd_addr.sa_family != AF_INET) 192 goto out; 193 sin = (struct sockaddr_in *)&data->gd_addr; 194 if (data->gd_maxlen > NFS3_FHSIZE) 195 data->gd_maxlen = NFS3_FHSIZE; 196 197 res = (struct knfsd_fh*)buf; 198 199 exp_readlock(); 200 if (!(clp = auth_unix_lookup(sin->sin_addr))) 201 err = -EPERM; 202 else { 203 err = exp_rootfh(clp, data->gd_path, res, data->gd_maxlen); 204 auth_domain_put(clp); 205 } 206 exp_readunlock(); 207 if (err == 0) 208 err = res->fh_size + (int)&((struct knfsd_fh*)0)->fh_base; 209 out: 210 return err; 211 } 212 213 static ssize_t write_getfd(struct file *file, char *buf, size_t size) 214 { 215 struct nfsctl_fdparm *data; 216 struct sockaddr_in *sin; 217 struct auth_domain *clp; 218 int err = 0; 219 struct knfsd_fh fh; 220 char *res; 221 222 if (size < sizeof(*data)) 223 return -EINVAL; 224 data = (struct nfsctl_fdparm*)buf; 225 err = -EPROTONOSUPPORT; 226 if (data->gd_addr.sa_family != AF_INET) 227 goto out; 228 err = -EINVAL; 229 if (data->gd_version < 2 || data->gd_version > NFSSVC_MAXVERS) 230 goto out; 231 232 res = buf; 233 sin = (struct sockaddr_in *)&data->gd_addr; 234 exp_readlock(); 235 if (!(clp = auth_unix_lookup(sin->sin_addr))) 236 err = -EPERM; 237 else { 238 err = exp_rootfh(clp, data->gd_path, &fh, NFS_FHSIZE); 239 auth_domain_put(clp); 240 } 241 exp_readunlock(); 242 243 if (err == 0) { 244 memset(res,0, NFS_FHSIZE); 245 memcpy(res, &fh.fh_base, fh.fh_size); 246 err = NFS_FHSIZE; 247 } 248 out: 249 return err; 250 } 251 252 static ssize_t write_filehandle(struct file *file, char *buf, size_t size) 253 { 254 /* request is: 255 * domain path maxsize 256 * response is 257 * filehandle 258 * 259 * qword quoting is used, so filehandle will be \x.... 260 */ 261 char *dname, *path; 262 int maxsize; 263 char *mesg = buf; 264 int len; 265 struct auth_domain *dom; 266 struct knfsd_fh fh; 267 268 if (buf[size-1] != '\n') 269 return -EINVAL; 270 buf[size-1] = 0; 271 272 dname = mesg; 273 len = qword_get(&mesg, dname, size); 274 if (len <= 0) return -EINVAL; 275 276 path = dname+len+1; 277 len = qword_get(&mesg, path, size); 278 if (len <= 0) return -EINVAL; 279 280 len = get_int(&mesg, &maxsize); 281 if (len) 282 return len; 283 284 if (maxsize < NFS_FHSIZE) 285 return -EINVAL; 286 if (maxsize > NFS3_FHSIZE) 287 maxsize = NFS3_FHSIZE; 288 289 if (qword_get(&mesg, mesg, size)>0) 290 return -EINVAL; 291 292 /* we have all the words, they are in buf.. */ 293 dom = unix_domain_find(dname); 294 if (!dom) 295 return -ENOMEM; 296 297 len = exp_rootfh(dom, path, &fh, maxsize); 298 auth_domain_put(dom); 299 if (len) 300 return len; 301 302 mesg = buf; len = SIMPLE_TRANSACTION_LIMIT; 303 qword_addhex(&mesg, &len, (char*)&fh.fh_base, fh.fh_size); 304 mesg[-1] = '\n'; 305 return mesg - buf; 306 } 307 308 extern int nfsd_nrthreads(void); 309 310 static ssize_t write_threads(struct file *file, char *buf, size_t size) 311 { 312 /* if size > 0, look for a number of threads and call nfsd_svc 313 * then write out number of threads as reply 314 */ 315 char *mesg = buf; 316 int rv; 317 if (size > 0) { 318 int newthreads; 319 rv = get_int(&mesg, &newthreads); 320 if (rv) 321 return rv; 322 if (newthreads <0) 323 return -EINVAL; 324 rv = nfsd_svc(2049, newthreads); 325 if (rv) 326 return rv; 327 } 328 sprintf(buf, "%d\n", nfsd_nrthreads()); 329 return strlen(buf); 330 } 331 332 extern time_t nfs4_leasetime(void); 333 334 static ssize_t write_leasetime(struct file *file, char *buf, size_t size) 335 { 336 /* if size > 10 seconds, call 337 * nfs4_reset_lease() then write out the new lease (seconds) as reply 338 */ 339 char *mesg = buf; 340 int rv; 341 342 if (size > 0) { 343 int lease; 344 rv = get_int(&mesg, &lease); 345 if (rv) 346 return rv; 347 if (lease < 10 || lease > 3600) 348 return -EINVAL; 349 nfs4_reset_lease(lease); 350 } 351 sprintf(buf, "%ld\n", nfs4_lease_time()); 352 return strlen(buf); 353 } 354 355 static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) 356 { 357 char *mesg = buf; 358 char *recdir; 359 int len, status; 360 361 if (size > PATH_MAX || buf[size-1] != '\n') 362 return -EINVAL; 363 buf[size-1] = 0; 364 365 recdir = mesg; 366 len = qword_get(&mesg, recdir, size); 367 if (len <= 0) 368 return -EINVAL; 369 370 status = nfs4_reset_recoverydir(recdir); 371 return strlen(buf); 372 } 373 374 /*----------------------------------------------------------------------------*/ 375 /* 376 * populating the filesystem. 377 */ 378 379 static int nfsd_fill_super(struct super_block * sb, void * data, int silent) 380 { 381 static struct tree_descr nfsd_files[] = { 382 [NFSD_Svc] = {".svc", &transaction_ops, S_IWUSR}, 383 [NFSD_Add] = {".add", &transaction_ops, S_IWUSR}, 384 [NFSD_Del] = {".del", &transaction_ops, S_IWUSR}, 385 [NFSD_Export] = {".export", &transaction_ops, S_IWUSR}, 386 [NFSD_Unexport] = {".unexport", &transaction_ops, S_IWUSR}, 387 [NFSD_Getfd] = {".getfd", &transaction_ops, S_IWUSR|S_IRUSR}, 388 [NFSD_Getfs] = {".getfs", &transaction_ops, S_IWUSR|S_IRUSR}, 389 [NFSD_List] = {"exports", &exports_operations, S_IRUGO}, 390 [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, 391 [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, 392 #ifdef CONFIG_NFSD_V4 393 [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, 394 [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, 395 #endif 396 /* last one */ {""} 397 }; 398 return simple_fill_super(sb, 0x6e667364, nfsd_files); 399 } 400 401 static struct super_block *nfsd_get_sb(struct file_system_type *fs_type, 402 int flags, const char *dev_name, void *data) 403 { 404 return get_sb_single(fs_type, flags, data, nfsd_fill_super); 405 } 406 407 static struct file_system_type nfsd_fs_type = { 408 .owner = THIS_MODULE, 409 .name = "nfsd", 410 .get_sb = nfsd_get_sb, 411 .kill_sb = kill_litter_super, 412 }; 413 414 static int __init init_nfsd(void) 415 { 416 int retval; 417 printk(KERN_INFO "Installing knfsd (copyright (C) 1996 okir@monad.swb.de).\n"); 418 419 nfsd_stat_init(); /* Statistics */ 420 nfsd_cache_init(); /* RPC reply cache */ 421 nfsd_export_init(); /* Exports table */ 422 nfsd_lockd_init(); /* lockd->nfsd callbacks */ 423 nfs4_state_init(); /* NFSv4 locking state */ 424 nfsd_idmap_init(); /* Name to ID mapping */ 425 if (proc_mkdir("fs/nfs", NULL)) { 426 struct proc_dir_entry *entry; 427 entry = create_proc_entry("fs/nfs/exports", 0, NULL); 428 if (entry) 429 entry->proc_fops = &exports_operations; 430 } 431 retval = register_filesystem(&nfsd_fs_type); 432 if (retval) { 433 nfsd_export_shutdown(); 434 nfsd_cache_shutdown(); 435 remove_proc_entry("fs/nfs/exports", NULL); 436 remove_proc_entry("fs/nfs", NULL); 437 nfsd_stat_shutdown(); 438 nfsd_lockd_shutdown(); 439 } 440 return retval; 441 } 442 443 static void __exit exit_nfsd(void) 444 { 445 nfsd_export_shutdown(); 446 nfsd_cache_shutdown(); 447 remove_proc_entry("fs/nfs/exports", NULL); 448 remove_proc_entry("fs/nfs", NULL); 449 nfsd_stat_shutdown(); 450 nfsd_lockd_shutdown(); 451 nfsd_idmap_shutdown(); 452 unregister_filesystem(&nfsd_fs_type); 453 } 454 455 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); 456 MODULE_LICENSE("GPL"); 457 module_init(init_nfsd) 458 module_exit(exit_nfsd) 459