| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * Syscall interface to knfsd. |
| 4 | * |
| 5 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> |
| 6 | */ |
| 7 | |
| 8 | #include <linux/slab.h> |
| 9 | #include <linux/namei.h> |
| 10 | #include <linux/ctype.h> |
| 11 | #include <linux/fs_context.h> |
| 12 | |
| 13 | #include <linux/sunrpc/svcsock.h> |
| 14 | #include <linux/lockd/lockd.h> |
| 15 | #include <linux/sunrpc/addr.h> |
| 16 | #include <linux/sunrpc/gss_api.h> |
| 17 | #include <linux/sunrpc/rpc_pipe_fs.h> |
| 18 | #include <linux/sunrpc/svc.h> |
| 19 | #include <linux/module.h> |
| 20 | #include <linux/fsnotify.h> |
| 21 | #include <linux/nfslocalio.h> |
| 22 | |
| 23 | #include "idmap.h" |
| 24 | #include "nfsd.h" |
| 25 | #include "cache.h" |
| 26 | #include "state.h" |
| 27 | #include "netns.h" |
| 28 | #include "pnfs.h" |
| 29 | #include "filecache.h" |
| 30 | #include "trace.h" |
| 31 | #include "netlink.h" |
| 32 | |
| 33 | /* |
| 34 | * We have a single directory with several nodes in it. |
| 35 | */ |
| 36 | enum { |
| 37 | NFSD_Root = 1, |
| 38 | NFSD_List, |
| 39 | NFSD_Export_Stats, |
| 40 | NFSD_Export_features, |
| 41 | NFSD_Fh, |
| 42 | NFSD_FO_UnlockIP, |
| 43 | NFSD_FO_UnlockFS, |
| 44 | NFSD_Threads, |
| 45 | NFSD_Pool_Threads, |
| 46 | NFSD_Pool_Stats, |
| 47 | NFSD_Reply_Cache_Stats, |
| 48 | NFSD_Versions, |
| 49 | NFSD_Ports, |
| 50 | NFSD_MaxBlkSize, |
| 51 | NFSD_MaxConnections, |
| 52 | NFSD_Filecache, |
| 53 | NFSD_Leasetime, |
| 54 | NFSD_Gracetime, |
| 55 | NFSD_RecoveryDir, |
| 56 | NFSD_V4EndGrace, |
| 57 | NFSD_MaxReserved |
| 58 | }; |
| 59 | |
| 60 | /* |
| 61 | * write() for these nodes. |
| 62 | */ |
| 63 | static ssize_t write_filehandle(struct file *file, char *buf, size_t size); |
| 64 | static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size); |
| 65 | static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size); |
| 66 | static ssize_t write_threads(struct file *file, char *buf, size_t size); |
| 67 | static ssize_t write_pool_threads(struct file *file, char *buf, size_t size); |
| 68 | static ssize_t write_versions(struct file *file, char *buf, size_t size); |
| 69 | static ssize_t write_ports(struct file *file, char *buf, size_t size); |
| 70 | static ssize_t write_maxblksize(struct file *file, char *buf, size_t size); |
| 71 | static ssize_t write_maxconn(struct file *file, char *buf, size_t size); |
| 72 | #ifdef CONFIG_NFSD_V4 |
| 73 | static ssize_t write_leasetime(struct file *file, char *buf, size_t size); |
| 74 | static ssize_t write_gracetime(struct file *file, char *buf, size_t size); |
| 75 | #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING |
| 76 | static ssize_t write_recoverydir(struct file *file, char *buf, size_t size); |
| 77 | #endif |
| 78 | static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size); |
| 79 | #endif |
| 80 | |
| 81 | static ssize_t (*const write_op[])(struct file *, char *, size_t) = { |
| 82 | [NFSD_Fh] = write_filehandle, |
| 83 | [NFSD_FO_UnlockIP] = write_unlock_ip, |
| 84 | [NFSD_FO_UnlockFS] = write_unlock_fs, |
| 85 | [NFSD_Threads] = write_threads, |
| 86 | [NFSD_Pool_Threads] = write_pool_threads, |
| 87 | [NFSD_Versions] = write_versions, |
| 88 | [NFSD_Ports] = write_ports, |
| 89 | [NFSD_MaxBlkSize] = write_maxblksize, |
| 90 | [NFSD_MaxConnections] = write_maxconn, |
| 91 | #ifdef CONFIG_NFSD_V4 |
| 92 | [NFSD_Leasetime] = write_leasetime, |
| 93 | [NFSD_Gracetime] = write_gracetime, |
| 94 | #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING |
| 95 | [NFSD_RecoveryDir] = write_recoverydir, |
| 96 | #endif |
| 97 | [NFSD_V4EndGrace] = write_v4_end_grace, |
| 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_inode(file)->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 | return rv; |
| 117 | |
| 118 | simple_transaction_set(file, rv); |
| 119 | return size; |
| 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 | .llseek = default_llseek, |
| 141 | }; |
| 142 | |
| 143 | static int exports_net_open(struct net *net, struct file *file) |
| 144 | { |
| 145 | int err; |
| 146 | struct seq_file *seq; |
| 147 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 148 | |
| 149 | err = seq_open(file, &nfs_exports_op); |
| 150 | if (err) |
| 151 | return err; |
| 152 | |
| 153 | seq = file->private_data; |
| 154 | seq->private = nn->svc_export_cache; |
| 155 | return 0; |
| 156 | } |
| 157 | |
| 158 | static int exports_nfsd_open(struct inode *inode, struct file *file) |
| 159 | { |
| 160 | return exports_net_open(inode->i_sb->s_fs_info, file); |
| 161 | } |
| 162 | |
| 163 | static const struct file_operations exports_nfsd_operations = { |
| 164 | .open = exports_nfsd_open, |
| 165 | .read = seq_read, |
| 166 | .llseek = seq_lseek, |
| 167 | .release = seq_release, |
| 168 | }; |
| 169 | |
| 170 | static int export_features_show(struct seq_file *m, void *v) |
| 171 | { |
| 172 | seq_printf(m, "0x%x 0x%x\n", NFSEXP_ALLFLAGS, NFSEXP_SECINFO_FLAGS); |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | DEFINE_SHOW_ATTRIBUTE(export_features); |
| 177 | |
| 178 | static int nfsd_pool_stats_open(struct inode *inode, struct file *file) |
| 179 | { |
| 180 | struct nfsd_net *nn = net_generic(inode->i_sb->s_fs_info, nfsd_net_id); |
| 181 | |
| 182 | return svc_pool_stats_open(&nn->nfsd_info, file); |
| 183 | } |
| 184 | |
| 185 | static const struct file_operations pool_stats_operations = { |
| 186 | .open = nfsd_pool_stats_open, |
| 187 | .read = seq_read, |
| 188 | .llseek = seq_lseek, |
| 189 | .release = seq_release, |
| 190 | }; |
| 191 | |
| 192 | DEFINE_SHOW_ATTRIBUTE(nfsd_reply_cache_stats); |
| 193 | |
| 194 | DEFINE_SHOW_ATTRIBUTE(nfsd_file_cache_stats); |
| 195 | |
| 196 | /*----------------------------------------------------------------------------*/ |
| 197 | /* |
| 198 | * payload - write methods |
| 199 | */ |
| 200 | |
| 201 | static inline struct net *netns(struct file *file) |
| 202 | { |
| 203 | return file_inode(file)->i_sb->s_fs_info; |
| 204 | } |
| 205 | |
| 206 | /* |
| 207 | * write_unlock_ip - Release all locks used by a client |
| 208 | * |
| 209 | * Experimental. |
| 210 | * |
| 211 | * Input: |
| 212 | * buf: '\n'-terminated C string containing a |
| 213 | * presentation format IP address |
| 214 | * size: length of C string in @buf |
| 215 | * Output: |
| 216 | * On success: returns zero if all specified locks were released; |
| 217 | * returns one if one or more locks were not released |
| 218 | * On error: return code is negative errno value |
| 219 | */ |
| 220 | static ssize_t write_unlock_ip(struct file *file, char *buf, size_t size) |
| 221 | { |
| 222 | struct sockaddr_storage address; |
| 223 | struct sockaddr *sap = (struct sockaddr *)&address; |
| 224 | size_t salen = sizeof(address); |
| 225 | char *fo_path; |
| 226 | struct net *net = netns(file); |
| 227 | |
| 228 | /* sanity check */ |
| 229 | if (size == 0) |
| 230 | return -EINVAL; |
| 231 | |
| 232 | if (buf[size-1] != '\n') |
| 233 | return -EINVAL; |
| 234 | |
| 235 | fo_path = buf; |
| 236 | if (qword_get(&buf, fo_path, size) < 0) |
| 237 | return -EINVAL; |
| 238 | |
| 239 | if (rpc_pton(net, fo_path, size, sap, salen) == 0) |
| 240 | return -EINVAL; |
| 241 | |
| 242 | trace_nfsd_ctl_unlock_ip(net, buf); |
| 243 | return nlmsvc_unlock_all_by_ip(sap); |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * write_unlock_fs - Release all locks on a local file system |
| 248 | * |
| 249 | * Experimental. |
| 250 | * |
| 251 | * Input: |
| 252 | * buf: '\n'-terminated C string containing the |
| 253 | * absolute pathname of a local file system |
| 254 | * size: length of C string in @buf |
| 255 | * Output: |
| 256 | * On success: returns zero if all specified locks were released; |
| 257 | * returns one if one or more locks were not released |
| 258 | * On error: return code is negative errno value |
| 259 | */ |
| 260 | static ssize_t write_unlock_fs(struct file *file, char *buf, size_t size) |
| 261 | { |
| 262 | struct path path; |
| 263 | char *fo_path; |
| 264 | int error; |
| 265 | |
| 266 | /* sanity check */ |
| 267 | if (size == 0) |
| 268 | return -EINVAL; |
| 269 | |
| 270 | if (buf[size-1] != '\n') |
| 271 | return -EINVAL; |
| 272 | |
| 273 | fo_path = buf; |
| 274 | if (qword_get(&buf, fo_path, size) < 0) |
| 275 | return -EINVAL; |
| 276 | trace_nfsd_ctl_unlock_fs(netns(file), fo_path); |
| 277 | error = kern_path(fo_path, 0, &path); |
| 278 | if (error) |
| 279 | return error; |
| 280 | |
| 281 | /* |
| 282 | * XXX: Needs better sanity checking. Otherwise we could end up |
| 283 | * releasing locks on the wrong file system. |
| 284 | * |
| 285 | * For example: |
| 286 | * 1. Does the path refer to a directory? |
| 287 | * 2. Is that directory a mount point, or |
| 288 | * 3. Is that directory the root of an exported file system? |
| 289 | */ |
| 290 | error = nlmsvc_unlock_all_by_sb(path.dentry->d_sb); |
| 291 | nfsd4_revoke_states(netns(file), path.dentry->d_sb); |
| 292 | |
| 293 | path_put(&path); |
| 294 | return error; |
| 295 | } |
| 296 | |
| 297 | /* |
| 298 | * write_filehandle - Get a variable-length NFS file handle by path |
| 299 | * |
| 300 | * On input, the buffer contains a '\n'-terminated C string comprised of |
| 301 | * three alphanumeric words separated by whitespace. The string may |
| 302 | * contain escape sequences. |
| 303 | * |
| 304 | * Input: |
| 305 | * buf: |
| 306 | * domain: client domain name |
| 307 | * path: export pathname |
| 308 | * maxsize: numeric maximum size of |
| 309 | * @buf |
| 310 | * size: length of C string in @buf |
| 311 | * Output: |
| 312 | * On success: passed-in buffer filled with '\n'-terminated C |
| 313 | * string containing a ASCII hex text version |
| 314 | * of the NFS file handle; |
| 315 | * return code is the size in bytes of the string |
| 316 | * On error: return code is negative errno value |
| 317 | */ |
| 318 | static ssize_t write_filehandle(struct file *file, char *buf, size_t size) |
| 319 | { |
| 320 | char *dname, *path; |
| 321 | int maxsize; |
| 322 | char *mesg = buf; |
| 323 | int len; |
| 324 | struct auth_domain *dom; |
| 325 | struct knfsd_fh fh; |
| 326 | |
| 327 | if (size == 0) |
| 328 | return -EINVAL; |
| 329 | |
| 330 | if (buf[size-1] != '\n') |
| 331 | return -EINVAL; |
| 332 | buf[size-1] = 0; |
| 333 | |
| 334 | dname = mesg; |
| 335 | len = qword_get(&mesg, dname, size); |
| 336 | if (len <= 0) |
| 337 | return -EINVAL; |
| 338 | |
| 339 | path = dname+len+1; |
| 340 | len = qword_get(&mesg, path, size); |
| 341 | if (len <= 0) |
| 342 | return -EINVAL; |
| 343 | |
| 344 | len = get_int(&mesg, &maxsize); |
| 345 | if (len) |
| 346 | return len; |
| 347 | |
| 348 | if (maxsize < NFS_FHSIZE) |
| 349 | return -EINVAL; |
| 350 | maxsize = min(maxsize, NFS3_FHSIZE); |
| 351 | |
| 352 | if (qword_get(&mesg, mesg, size) > 0) |
| 353 | return -EINVAL; |
| 354 | |
| 355 | trace_nfsd_ctl_filehandle(netns(file), dname, path, maxsize); |
| 356 | |
| 357 | /* we have all the words, they are in buf.. */ |
| 358 | dom = unix_domain_find(dname); |
| 359 | if (!dom) |
| 360 | return -ENOMEM; |
| 361 | |
| 362 | len = exp_rootfh(netns(file), dom, path, &fh, maxsize); |
| 363 | auth_domain_put(dom); |
| 364 | if (len) |
| 365 | return len; |
| 366 | |
| 367 | mesg = buf; |
| 368 | len = SIMPLE_TRANSACTION_LIMIT; |
| 369 | qword_addhex(&mesg, &len, fh.fh_raw, fh.fh_size); |
| 370 | mesg[-1] = '\n'; |
| 371 | return mesg - buf; |
| 372 | } |
| 373 | |
| 374 | /* |
| 375 | * write_threads - Start NFSD, or report the current number of running threads |
| 376 | * |
| 377 | * Input: |
| 378 | * buf: ignored |
| 379 | * size: zero |
| 380 | * Output: |
| 381 | * On success: passed-in buffer filled with '\n'-terminated C |
| 382 | * string numeric value representing the number of |
| 383 | * running NFSD threads; |
| 384 | * return code is the size in bytes of the string |
| 385 | * On error: return code is zero |
| 386 | * |
| 387 | * OR |
| 388 | * |
| 389 | * Input: |
| 390 | * buf: C string containing an unsigned |
| 391 | * integer value representing the |
| 392 | * number of NFSD threads to start |
| 393 | * size: non-zero length of C string in @buf |
| 394 | * Output: |
| 395 | * On success: NFS service is started; |
| 396 | * passed-in buffer filled with '\n'-terminated C |
| 397 | * string numeric value representing the number of |
| 398 | * running NFSD threads; |
| 399 | * return code is the size in bytes of the string |
| 400 | * On error: return code is zero or a negative errno value |
| 401 | */ |
| 402 | static ssize_t write_threads(struct file *file, char *buf, size_t size) |
| 403 | { |
| 404 | char *mesg = buf; |
| 405 | int rv; |
| 406 | struct net *net = netns(file); |
| 407 | |
| 408 | if (size > 0) { |
| 409 | int newthreads; |
| 410 | rv = get_int(&mesg, &newthreads); |
| 411 | if (rv) |
| 412 | return rv; |
| 413 | if (newthreads < 0) |
| 414 | return -EINVAL; |
| 415 | trace_nfsd_ctl_threads(net, newthreads); |
| 416 | mutex_lock(&nfsd_mutex); |
| 417 | rv = nfsd_svc(1, &newthreads, net, file->f_cred, NULL); |
| 418 | mutex_unlock(&nfsd_mutex); |
| 419 | if (rv < 0) |
| 420 | return rv; |
| 421 | } else |
| 422 | rv = nfsd_nrthreads(net); |
| 423 | |
| 424 | return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", rv); |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * write_pool_threads - Set or report the current number of threads per pool |
| 429 | * |
| 430 | * Input: |
| 431 | * buf: ignored |
| 432 | * size: zero |
| 433 | * |
| 434 | * OR |
| 435 | * |
| 436 | * Input: |
| 437 | * buf: C string containing whitespace- |
| 438 | * separated unsigned integer values |
| 439 | * representing the number of NFSD |
| 440 | * threads to start in each pool |
| 441 | * size: non-zero length of C string in @buf |
| 442 | * Output: |
| 443 | * On success: passed-in buffer filled with '\n'-terminated C |
| 444 | * string containing integer values representing the |
| 445 | * number of NFSD threads in each pool; |
| 446 | * return code is the size in bytes of the string |
| 447 | * On error: return code is zero or a negative errno value |
| 448 | */ |
| 449 | static ssize_t write_pool_threads(struct file *file, char *buf, size_t size) |
| 450 | { |
| 451 | /* if size > 0, look for an array of number of threads per node |
| 452 | * and apply them then write out number of threads per node as reply |
| 453 | */ |
| 454 | char *mesg = buf; |
| 455 | int i; |
| 456 | int rv; |
| 457 | int len; |
| 458 | int npools; |
| 459 | int *nthreads; |
| 460 | struct net *net = netns(file); |
| 461 | |
| 462 | mutex_lock(&nfsd_mutex); |
| 463 | npools = nfsd_nrpools(net); |
| 464 | if (npools == 0) { |
| 465 | /* |
| 466 | * NFS is shut down. The admin can start it by |
| 467 | * writing to the threads file but NOT the pool_threads |
| 468 | * file, sorry. Report zero threads. |
| 469 | */ |
| 470 | mutex_unlock(&nfsd_mutex); |
| 471 | strcpy(buf, "0\n"); |
| 472 | return strlen(buf); |
| 473 | } |
| 474 | |
| 475 | nthreads = kcalloc(npools, sizeof(int), GFP_KERNEL); |
| 476 | rv = -ENOMEM; |
| 477 | if (nthreads == NULL) |
| 478 | goto out_free; |
| 479 | |
| 480 | if (size > 0) { |
| 481 | for (i = 0; i < npools; i++) { |
| 482 | rv = get_int(&mesg, &nthreads[i]); |
| 483 | if (rv == -ENOENT) |
| 484 | break; /* fewer numbers than pools */ |
| 485 | if (rv) |
| 486 | goto out_free; /* syntax error */ |
| 487 | rv = -EINVAL; |
| 488 | if (nthreads[i] < 0) |
| 489 | goto out_free; |
| 490 | trace_nfsd_ctl_pool_threads(net, i, nthreads[i]); |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * There must always be a thread in pool 0; the admin |
| 495 | * can't shut down NFS completely using pool_threads. |
| 496 | */ |
| 497 | if (nthreads[0] == 0) |
| 498 | nthreads[0] = 1; |
| 499 | |
| 500 | rv = nfsd_set_nrthreads(i, nthreads, net); |
| 501 | if (rv) |
| 502 | goto out_free; |
| 503 | } |
| 504 | |
| 505 | rv = nfsd_get_nrthreads(npools, nthreads, net); |
| 506 | if (rv) |
| 507 | goto out_free; |
| 508 | |
| 509 | mesg = buf; |
| 510 | size = SIMPLE_TRANSACTION_LIMIT; |
| 511 | for (i = 0; i < npools && size > 0; i++) { |
| 512 | snprintf(mesg, size, "%d%c", nthreads[i], (i == npools-1 ? '\n' : ' ')); |
| 513 | len = strlen(mesg); |
| 514 | size -= len; |
| 515 | mesg += len; |
| 516 | } |
| 517 | rv = mesg - buf; |
| 518 | out_free: |
| 519 | kfree(nthreads); |
| 520 | mutex_unlock(&nfsd_mutex); |
| 521 | return rv; |
| 522 | } |
| 523 | |
| 524 | static ssize_t |
| 525 | nfsd_print_version_support(struct nfsd_net *nn, char *buf, int remaining, |
| 526 | const char *sep, unsigned vers, int minor) |
| 527 | { |
| 528 | const char *format = minor < 0 ? "%s%c%u" : "%s%c%u.%u"; |
| 529 | bool supported = !!nfsd_vers(nn, vers, NFSD_TEST); |
| 530 | |
| 531 | if (vers == 4 && minor >= 0 && |
| 532 | !nfsd_minorversion(nn, minor, NFSD_TEST)) |
| 533 | supported = false; |
| 534 | if (minor == 0 && supported) |
| 535 | /* |
| 536 | * special case for backward compatability. |
| 537 | * +4.0 is never reported, it is implied by |
| 538 | * +4, unless -4.0 is present. |
| 539 | */ |
| 540 | return 0; |
| 541 | return snprintf(buf, remaining, format, sep, |
| 542 | supported ? '+' : '-', vers, minor); |
| 543 | } |
| 544 | |
| 545 | static ssize_t __write_versions(struct file *file, char *buf, size_t size) |
| 546 | { |
| 547 | char *mesg = buf; |
| 548 | char *vers, *minorp, sign; |
| 549 | int len, num, remaining; |
| 550 | ssize_t tlen = 0; |
| 551 | char *sep; |
| 552 | struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); |
| 553 | |
| 554 | if (size > 0) { |
| 555 | if (nn->nfsd_serv) |
| 556 | /* Cannot change versions without updating |
| 557 | * nn->nfsd_serv->sv_xdrsize, and reallocing |
| 558 | * rq_argp and rq_resp |
| 559 | */ |
| 560 | return -EBUSY; |
| 561 | if (buf[size-1] != '\n') |
| 562 | return -EINVAL; |
| 563 | buf[size-1] = 0; |
| 564 | trace_nfsd_ctl_version(netns(file), buf); |
| 565 | |
| 566 | vers = mesg; |
| 567 | len = qword_get(&mesg, vers, size); |
| 568 | if (len <= 0) return -EINVAL; |
| 569 | do { |
| 570 | enum vers_op cmd; |
| 571 | unsigned minor; |
| 572 | sign = *vers; |
| 573 | if (sign == '+' || sign == '-') |
| 574 | num = simple_strtol((vers+1), &minorp, 0); |
| 575 | else |
| 576 | num = simple_strtol(vers, &minorp, 0); |
| 577 | if (*minorp == '.') { |
| 578 | if (num != 4) |
| 579 | return -EINVAL; |
| 580 | if (kstrtouint(minorp+1, 0, &minor) < 0) |
| 581 | return -EINVAL; |
| 582 | } |
| 583 | |
| 584 | cmd = sign == '-' ? NFSD_CLEAR : NFSD_SET; |
| 585 | switch(num) { |
| 586 | #ifdef CONFIG_NFSD_V2 |
| 587 | case 2: |
| 588 | #endif |
| 589 | case 3: |
| 590 | nfsd_vers(nn, num, cmd); |
| 591 | break; |
| 592 | case 4: |
| 593 | if (*minorp == '.') { |
| 594 | if (nfsd_minorversion(nn, minor, cmd) < 0) |
| 595 | return -EINVAL; |
| 596 | } else if ((cmd == NFSD_SET) != nfsd_vers(nn, num, NFSD_TEST)) { |
| 597 | /* |
| 598 | * Either we have +4 and no minors are enabled, |
| 599 | * or we have -4 and at least one minor is enabled. |
| 600 | * In either case, propagate 'cmd' to all minors. |
| 601 | */ |
| 602 | minor = 0; |
| 603 | while (nfsd_minorversion(nn, minor, cmd) >= 0) |
| 604 | minor++; |
| 605 | } |
| 606 | break; |
| 607 | default: |
| 608 | /* Ignore requests to disable non-existent versions */ |
| 609 | if (cmd == NFSD_SET) |
| 610 | return -EINVAL; |
| 611 | } |
| 612 | vers += len + 1; |
| 613 | } while ((len = qword_get(&mesg, vers, size)) > 0); |
| 614 | /* If all get turned off, turn them back on, as |
| 615 | * having no versions is BAD |
| 616 | */ |
| 617 | nfsd_reset_versions(nn); |
| 618 | } |
| 619 | |
| 620 | /* Now write current state into reply buffer */ |
| 621 | sep = ""; |
| 622 | remaining = SIMPLE_TRANSACTION_LIMIT; |
| 623 | for (num=2 ; num <= 4 ; num++) { |
| 624 | int minor; |
| 625 | if (!nfsd_vers(nn, num, NFSD_AVAIL)) |
| 626 | continue; |
| 627 | |
| 628 | minor = -1; |
| 629 | do { |
| 630 | len = nfsd_print_version_support(nn, buf, remaining, |
| 631 | sep, num, minor); |
| 632 | if (len >= remaining) |
| 633 | goto out; |
| 634 | remaining -= len; |
| 635 | buf += len; |
| 636 | tlen += len; |
| 637 | minor++; |
| 638 | if (len) |
| 639 | sep = " "; |
| 640 | } while (num == 4 && minor <= NFSD_SUPPORTED_MINOR_VERSION); |
| 641 | } |
| 642 | out: |
| 643 | len = snprintf(buf, remaining, "\n"); |
| 644 | if (len >= remaining) |
| 645 | return -EINVAL; |
| 646 | return tlen + len; |
| 647 | } |
| 648 | |
| 649 | /* |
| 650 | * write_versions - Set or report the available NFS protocol versions |
| 651 | * |
| 652 | * Input: |
| 653 | * buf: ignored |
| 654 | * size: zero |
| 655 | * Output: |
| 656 | * On success: passed-in buffer filled with '\n'-terminated C |
| 657 | * string containing positive or negative integer |
| 658 | * values representing the current status of each |
| 659 | * protocol version; |
| 660 | * return code is the size in bytes of the string |
| 661 | * On error: return code is zero or a negative errno value |
| 662 | * |
| 663 | * OR |
| 664 | * |
| 665 | * Input: |
| 666 | * buf: C string containing whitespace- |
| 667 | * separated positive or negative |
| 668 | * integer values representing NFS |
| 669 | * protocol versions to enable ("+n") |
| 670 | * or disable ("-n") |
| 671 | * size: non-zero length of C string in @buf |
| 672 | * Output: |
| 673 | * On success: status of zero or more protocol versions has |
| 674 | * been updated; passed-in buffer filled with |
| 675 | * '\n'-terminated C string containing positive |
| 676 | * or negative integer values representing the |
| 677 | * current status of each protocol version; |
| 678 | * return code is the size in bytes of the string |
| 679 | * On error: return code is zero or a negative errno value |
| 680 | */ |
| 681 | static ssize_t write_versions(struct file *file, char *buf, size_t size) |
| 682 | { |
| 683 | ssize_t rv; |
| 684 | |
| 685 | mutex_lock(&nfsd_mutex); |
| 686 | rv = __write_versions(file, buf, size); |
| 687 | mutex_unlock(&nfsd_mutex); |
| 688 | return rv; |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Zero-length write. Return a list of NFSD's current listener |
| 693 | * transports. |
| 694 | */ |
| 695 | static ssize_t __write_ports_names(char *buf, struct net *net) |
| 696 | { |
| 697 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 698 | |
| 699 | if (nn->nfsd_serv == NULL) |
| 700 | return 0; |
| 701 | return svc_xprt_names(nn->nfsd_serv, buf, SIMPLE_TRANSACTION_LIMIT); |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * A single 'fd' number was written, in which case it must be for |
| 706 | * a socket of a supported family/protocol, and we use it as an |
| 707 | * nfsd listener. |
| 708 | */ |
| 709 | static ssize_t __write_ports_addfd(char *buf, struct net *net, const struct cred *cred) |
| 710 | { |
| 711 | char *mesg = buf; |
| 712 | int fd, err; |
| 713 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 714 | struct svc_serv *serv; |
| 715 | |
| 716 | err = get_int(&mesg, &fd); |
| 717 | if (err != 0 || fd < 0) |
| 718 | return -EINVAL; |
| 719 | trace_nfsd_ctl_ports_addfd(net, fd); |
| 720 | |
| 721 | err = nfsd_create_serv(net); |
| 722 | if (err != 0) |
| 723 | return err; |
| 724 | |
| 725 | serv = nn->nfsd_serv; |
| 726 | err = svc_addsock(serv, net, fd, buf, SIMPLE_TRANSACTION_LIMIT, cred); |
| 727 | |
| 728 | if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks)) |
| 729 | nfsd_destroy_serv(net); |
| 730 | |
| 731 | return err; |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * A transport listener is added by writing its transport name and |
| 736 | * a port number. |
| 737 | */ |
| 738 | static ssize_t __write_ports_addxprt(char *buf, struct net *net, const struct cred *cred) |
| 739 | { |
| 740 | char transport[16]; |
| 741 | struct svc_xprt *xprt; |
| 742 | int port, err; |
| 743 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 744 | struct svc_serv *serv; |
| 745 | |
| 746 | if (sscanf(buf, "%15s %5u", transport, &port) != 2) |
| 747 | return -EINVAL; |
| 748 | |
| 749 | if (port < 1 || port > USHRT_MAX) |
| 750 | return -EINVAL; |
| 751 | trace_nfsd_ctl_ports_addxprt(net, transport, port); |
| 752 | |
| 753 | err = nfsd_create_serv(net); |
| 754 | if (err != 0) |
| 755 | return err; |
| 756 | |
| 757 | serv = nn->nfsd_serv; |
| 758 | err = svc_xprt_create(serv, transport, net, |
| 759 | PF_INET, port, SVC_SOCK_ANONYMOUS, cred); |
| 760 | if (err < 0) |
| 761 | goto out_err; |
| 762 | |
| 763 | err = svc_xprt_create(serv, transport, net, |
| 764 | PF_INET6, port, SVC_SOCK_ANONYMOUS, cred); |
| 765 | if (err < 0 && err != -EAFNOSUPPORT) |
| 766 | goto out_close; |
| 767 | |
| 768 | return 0; |
| 769 | out_close: |
| 770 | xprt = svc_find_xprt(serv, transport, net, PF_INET, port); |
| 771 | if (xprt != NULL) { |
| 772 | svc_xprt_close(xprt); |
| 773 | svc_xprt_put(xprt); |
| 774 | } |
| 775 | out_err: |
| 776 | if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks)) |
| 777 | nfsd_destroy_serv(net); |
| 778 | |
| 779 | return err; |
| 780 | } |
| 781 | |
| 782 | static ssize_t __write_ports(struct file *file, char *buf, size_t size, |
| 783 | struct net *net) |
| 784 | { |
| 785 | if (size == 0) |
| 786 | return __write_ports_names(buf, net); |
| 787 | |
| 788 | if (isdigit(buf[0])) |
| 789 | return __write_ports_addfd(buf, net, file->f_cred); |
| 790 | |
| 791 | if (isalpha(buf[0])) |
| 792 | return __write_ports_addxprt(buf, net, file->f_cred); |
| 793 | |
| 794 | return -EINVAL; |
| 795 | } |
| 796 | |
| 797 | /* |
| 798 | * write_ports - Pass a socket file descriptor or transport name to listen on |
| 799 | * |
| 800 | * Input: |
| 801 | * buf: ignored |
| 802 | * size: zero |
| 803 | * Output: |
| 804 | * On success: passed-in buffer filled with a '\n'-terminated C |
| 805 | * string containing a whitespace-separated list of |
| 806 | * named NFSD listeners; |
| 807 | * return code is the size in bytes of the string |
| 808 | * On error: return code is zero or a negative errno value |
| 809 | * |
| 810 | * OR |
| 811 | * |
| 812 | * Input: |
| 813 | * buf: C string containing an unsigned |
| 814 | * integer value representing a bound |
| 815 | * but unconnected socket that is to be |
| 816 | * used as an NFSD listener; listen(3) |
| 817 | * must be called for a SOCK_STREAM |
| 818 | * socket, otherwise it is ignored |
| 819 | * size: non-zero length of C string in @buf |
| 820 | * Output: |
| 821 | * On success: NFS service is started; |
| 822 | * passed-in buffer filled with a '\n'-terminated C |
| 823 | * string containing a unique alphanumeric name of |
| 824 | * the listener; |
| 825 | * return code is the size in bytes of the string |
| 826 | * On error: return code is a negative errno value |
| 827 | * |
| 828 | * OR |
| 829 | * |
| 830 | * Input: |
| 831 | * buf: C string containing a transport |
| 832 | * name and an unsigned integer value |
| 833 | * representing the port to listen on, |
| 834 | * separated by whitespace |
| 835 | * size: non-zero length of C string in @buf |
| 836 | * Output: |
| 837 | * On success: returns zero; NFS service is started |
| 838 | * On error: return code is a negative errno value |
| 839 | */ |
| 840 | static ssize_t write_ports(struct file *file, char *buf, size_t size) |
| 841 | { |
| 842 | ssize_t rv; |
| 843 | |
| 844 | mutex_lock(&nfsd_mutex); |
| 845 | rv = __write_ports(file, buf, size, netns(file)); |
| 846 | mutex_unlock(&nfsd_mutex); |
| 847 | return rv; |
| 848 | } |
| 849 | |
| 850 | |
| 851 | int nfsd_max_blksize; |
| 852 | |
| 853 | /* |
| 854 | * write_maxblksize - Set or report the current NFS blksize |
| 855 | * |
| 856 | * Input: |
| 857 | * buf: ignored |
| 858 | * size: zero |
| 859 | * |
| 860 | * OR |
| 861 | * |
| 862 | * Input: |
| 863 | * buf: C string containing an unsigned |
| 864 | * integer value representing the new |
| 865 | * NFS blksize |
| 866 | * size: non-zero length of C string in @buf |
| 867 | * Output: |
| 868 | * On success: passed-in buffer filled with '\n'-terminated C string |
| 869 | * containing numeric value of the current NFS blksize |
| 870 | * setting; |
| 871 | * return code is the size in bytes of the string |
| 872 | * On error: return code is zero or a negative errno value |
| 873 | */ |
| 874 | static ssize_t write_maxblksize(struct file *file, char *buf, size_t size) |
| 875 | { |
| 876 | char *mesg = buf; |
| 877 | struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); |
| 878 | |
| 879 | if (size > 0) { |
| 880 | int bsize; |
| 881 | int rv = get_int(&mesg, &bsize); |
| 882 | if (rv) |
| 883 | return rv; |
| 884 | trace_nfsd_ctl_maxblksize(netns(file), bsize); |
| 885 | |
| 886 | /* force bsize into allowed range and |
| 887 | * required alignment. |
| 888 | */ |
| 889 | bsize = max_t(int, bsize, 1024); |
| 890 | bsize = min_t(int, bsize, NFSSVC_MAXBLKSIZE); |
| 891 | bsize &= ~(1024-1); |
| 892 | mutex_lock(&nfsd_mutex); |
| 893 | if (nn->nfsd_serv) { |
| 894 | mutex_unlock(&nfsd_mutex); |
| 895 | return -EBUSY; |
| 896 | } |
| 897 | nfsd_max_blksize = bsize; |
| 898 | mutex_unlock(&nfsd_mutex); |
| 899 | } |
| 900 | |
| 901 | return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%d\n", |
| 902 | nfsd_max_blksize); |
| 903 | } |
| 904 | |
| 905 | /* |
| 906 | * write_maxconn - Set or report the current max number of connections |
| 907 | * |
| 908 | * Input: |
| 909 | * buf: ignored |
| 910 | * size: zero |
| 911 | * OR |
| 912 | * |
| 913 | * Input: |
| 914 | * buf: C string containing an unsigned |
| 915 | * integer value representing the new |
| 916 | * number of max connections |
| 917 | * size: non-zero length of C string in @buf |
| 918 | * Output: |
| 919 | * On success: passed-in buffer filled with '\n'-terminated C string |
| 920 | * containing numeric value of max_connections setting |
| 921 | * for this net namespace; |
| 922 | * return code is the size in bytes of the string |
| 923 | * On error: return code is zero or a negative errno value |
| 924 | */ |
| 925 | static ssize_t write_maxconn(struct file *file, char *buf, size_t size) |
| 926 | { |
| 927 | char *mesg = buf; |
| 928 | struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); |
| 929 | unsigned int maxconn = nn->max_connections; |
| 930 | |
| 931 | if (size > 0) { |
| 932 | int rv = get_uint(&mesg, &maxconn); |
| 933 | |
| 934 | if (rv) |
| 935 | return rv; |
| 936 | trace_nfsd_ctl_maxconn(netns(file), maxconn); |
| 937 | nn->max_connections = maxconn; |
| 938 | } |
| 939 | |
| 940 | return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%u\n", maxconn); |
| 941 | } |
| 942 | |
| 943 | #ifdef CONFIG_NFSD_V4 |
| 944 | static ssize_t __nfsd4_write_time(struct file *file, char *buf, size_t size, |
| 945 | time64_t *time, struct nfsd_net *nn) |
| 946 | { |
| 947 | struct dentry *dentry = file_dentry(file); |
| 948 | char *mesg = buf; |
| 949 | int rv, i; |
| 950 | |
| 951 | if (size > 0) { |
| 952 | if (nn->nfsd_serv) |
| 953 | return -EBUSY; |
| 954 | rv = get_int(&mesg, &i); |
| 955 | if (rv) |
| 956 | return rv; |
| 957 | trace_nfsd_ctl_time(netns(file), dentry->d_name.name, |
| 958 | dentry->d_name.len, i); |
| 959 | |
| 960 | /* |
| 961 | * Some sanity checking. We don't have a reason for |
| 962 | * these particular numbers, but problems with the |
| 963 | * extremes are: |
| 964 | * - Too short: the briefest network outage may |
| 965 | * cause clients to lose all their locks. Also, |
| 966 | * the frequent polling may be wasteful. |
| 967 | * - Too long: do you really want reboot recovery |
| 968 | * to take more than an hour? Or to make other |
| 969 | * clients wait an hour before being able to |
| 970 | * revoke a dead client's locks? |
| 971 | */ |
| 972 | if (i < 10 || i > 3600) |
| 973 | return -EINVAL; |
| 974 | *time = i; |
| 975 | } |
| 976 | |
| 977 | return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%lld\n", *time); |
| 978 | } |
| 979 | |
| 980 | static ssize_t nfsd4_write_time(struct file *file, char *buf, size_t size, |
| 981 | time64_t *time, struct nfsd_net *nn) |
| 982 | { |
| 983 | ssize_t rv; |
| 984 | |
| 985 | mutex_lock(&nfsd_mutex); |
| 986 | rv = __nfsd4_write_time(file, buf, size, time, nn); |
| 987 | mutex_unlock(&nfsd_mutex); |
| 988 | return rv; |
| 989 | } |
| 990 | |
| 991 | /* |
| 992 | * write_leasetime - Set or report the current NFSv4 lease time |
| 993 | * |
| 994 | * Input: |
| 995 | * buf: ignored |
| 996 | * size: zero |
| 997 | * |
| 998 | * OR |
| 999 | * |
| 1000 | * Input: |
| 1001 | * buf: C string containing an unsigned |
| 1002 | * integer value representing the new |
| 1003 | * NFSv4 lease expiry time |
| 1004 | * size: non-zero length of C string in @buf |
| 1005 | * Output: |
| 1006 | * On success: passed-in buffer filled with '\n'-terminated C |
| 1007 | * string containing unsigned integer value of the |
| 1008 | * current lease expiry time; |
| 1009 | * return code is the size in bytes of the string |
| 1010 | * On error: return code is zero or a negative errno value |
| 1011 | */ |
| 1012 | static ssize_t write_leasetime(struct file *file, char *buf, size_t size) |
| 1013 | { |
| 1014 | struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); |
| 1015 | return nfsd4_write_time(file, buf, size, &nn->nfsd4_lease, nn); |
| 1016 | } |
| 1017 | |
| 1018 | /* |
| 1019 | * write_gracetime - Set or report current NFSv4 grace period time |
| 1020 | * |
| 1021 | * As above, but sets the time of the NFSv4 grace period. |
| 1022 | * |
| 1023 | * Note this should never be set to less than the *previous* |
| 1024 | * lease-period time, but we don't try to enforce this. (In the common |
| 1025 | * case (a new boot), we don't know what the previous lease time was |
| 1026 | * anyway.) |
| 1027 | */ |
| 1028 | static ssize_t write_gracetime(struct file *file, char *buf, size_t size) |
| 1029 | { |
| 1030 | struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); |
| 1031 | return nfsd4_write_time(file, buf, size, &nn->nfsd4_grace, nn); |
| 1032 | } |
| 1033 | |
| 1034 | #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING |
| 1035 | static ssize_t __write_recoverydir(struct file *file, char *buf, size_t size, |
| 1036 | struct nfsd_net *nn) |
| 1037 | { |
| 1038 | char *mesg = buf; |
| 1039 | char *recdir; |
| 1040 | int len, status; |
| 1041 | |
| 1042 | if (size > 0) { |
| 1043 | if (nn->nfsd_serv) |
| 1044 | return -EBUSY; |
| 1045 | if (size > PATH_MAX || buf[size-1] != '\n') |
| 1046 | return -EINVAL; |
| 1047 | buf[size-1] = 0; |
| 1048 | |
| 1049 | recdir = mesg; |
| 1050 | len = qword_get(&mesg, recdir, size); |
| 1051 | if (len <= 0) |
| 1052 | return -EINVAL; |
| 1053 | trace_nfsd_ctl_recoverydir(netns(file), recdir); |
| 1054 | |
| 1055 | status = nfs4_reset_recoverydir(recdir); |
| 1056 | if (status) |
| 1057 | return status; |
| 1058 | } |
| 1059 | |
| 1060 | return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%s\n", |
| 1061 | nfs4_recoverydir()); |
| 1062 | } |
| 1063 | |
| 1064 | /* |
| 1065 | * write_recoverydir - Set or report the pathname of the recovery directory |
| 1066 | * |
| 1067 | * Input: |
| 1068 | * buf: ignored |
| 1069 | * size: zero |
| 1070 | * |
| 1071 | * OR |
| 1072 | * |
| 1073 | * Input: |
| 1074 | * buf: C string containing the pathname |
| 1075 | * of the directory on a local file |
| 1076 | * system containing permanent NFSv4 |
| 1077 | * recovery data |
| 1078 | * size: non-zero length of C string in @buf |
| 1079 | * Output: |
| 1080 | * On success: passed-in buffer filled with '\n'-terminated C string |
| 1081 | * containing the current recovery pathname setting; |
| 1082 | * return code is the size in bytes of the string |
| 1083 | * On error: return code is zero or a negative errno value |
| 1084 | */ |
| 1085 | static ssize_t write_recoverydir(struct file *file, char *buf, size_t size) |
| 1086 | { |
| 1087 | ssize_t rv; |
| 1088 | struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); |
| 1089 | |
| 1090 | mutex_lock(&nfsd_mutex); |
| 1091 | rv = __write_recoverydir(file, buf, size, nn); |
| 1092 | mutex_unlock(&nfsd_mutex); |
| 1093 | return rv; |
| 1094 | } |
| 1095 | #endif |
| 1096 | |
| 1097 | /* |
| 1098 | * write_v4_end_grace - release grace period for nfsd's v4.x lock manager |
| 1099 | * |
| 1100 | * Input: |
| 1101 | * buf: ignored |
| 1102 | * size: zero |
| 1103 | * OR |
| 1104 | * |
| 1105 | * Input: |
| 1106 | * buf: any value |
| 1107 | * size: non-zero length of C string in @buf |
| 1108 | * Output: |
| 1109 | * passed-in buffer filled with "Y" or "N" with a newline |
| 1110 | * and NULL-terminated C string. This indicates whether |
| 1111 | * the grace period has ended in the current net |
| 1112 | * namespace. Return code is the size in bytes of the |
| 1113 | * string. Writing a string that starts with 'Y', 'y', or |
| 1114 | * '1' to the file will end the grace period for nfsd's v4 |
| 1115 | * lock manager. |
| 1116 | */ |
| 1117 | static ssize_t write_v4_end_grace(struct file *file, char *buf, size_t size) |
| 1118 | { |
| 1119 | struct nfsd_net *nn = net_generic(netns(file), nfsd_net_id); |
| 1120 | |
| 1121 | if (size > 0) { |
| 1122 | switch(buf[0]) { |
| 1123 | case 'Y': |
| 1124 | case 'y': |
| 1125 | case '1': |
| 1126 | if (!nn->nfsd_serv) |
| 1127 | return -EBUSY; |
| 1128 | trace_nfsd_end_grace(netns(file)); |
| 1129 | nfsd4_end_grace(nn); |
| 1130 | break; |
| 1131 | default: |
| 1132 | return -EINVAL; |
| 1133 | } |
| 1134 | } |
| 1135 | |
| 1136 | return scnprintf(buf, SIMPLE_TRANSACTION_LIMIT, "%c\n", |
| 1137 | nn->grace_ended ? 'Y' : 'N'); |
| 1138 | } |
| 1139 | |
| 1140 | #endif |
| 1141 | |
| 1142 | /*----------------------------------------------------------------------------*/ |
| 1143 | /* |
| 1144 | * populating the filesystem. |
| 1145 | */ |
| 1146 | |
| 1147 | /* Basically copying rpc_get_inode. */ |
| 1148 | static struct inode *nfsd_get_inode(struct super_block *sb, umode_t mode) |
| 1149 | { |
| 1150 | struct inode *inode = new_inode(sb); |
| 1151 | if (!inode) |
| 1152 | return NULL; |
| 1153 | /* Following advice from simple_fill_super documentation: */ |
| 1154 | inode->i_ino = iunique(sb, NFSD_MaxReserved); |
| 1155 | inode->i_mode = mode; |
| 1156 | simple_inode_init_ts(inode); |
| 1157 | switch (mode & S_IFMT) { |
| 1158 | case S_IFDIR: |
| 1159 | inode->i_fop = &simple_dir_operations; |
| 1160 | inode->i_op = &simple_dir_inode_operations; |
| 1161 | inc_nlink(inode); |
| 1162 | break; |
| 1163 | case S_IFLNK: |
| 1164 | inode->i_op = &simple_symlink_inode_operations; |
| 1165 | break; |
| 1166 | default: |
| 1167 | break; |
| 1168 | } |
| 1169 | return inode; |
| 1170 | } |
| 1171 | |
| 1172 | static int __nfsd_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode, struct nfsdfs_client *ncl) |
| 1173 | { |
| 1174 | struct inode *inode; |
| 1175 | |
| 1176 | inode = nfsd_get_inode(dir->i_sb, mode); |
| 1177 | if (!inode) |
| 1178 | return -ENOMEM; |
| 1179 | if (ncl) { |
| 1180 | inode->i_private = ncl; |
| 1181 | kref_get(&ncl->cl_ref); |
| 1182 | } |
| 1183 | d_add(dentry, inode); |
| 1184 | inc_nlink(dir); |
| 1185 | fsnotify_mkdir(dir, dentry); |
| 1186 | return 0; |
| 1187 | } |
| 1188 | |
| 1189 | static struct dentry *nfsd_mkdir(struct dentry *parent, struct nfsdfs_client *ncl, char *name) |
| 1190 | { |
| 1191 | struct inode *dir = parent->d_inode; |
| 1192 | struct dentry *dentry; |
| 1193 | int ret = -ENOMEM; |
| 1194 | |
| 1195 | inode_lock(dir); |
| 1196 | dentry = d_alloc_name(parent, name); |
| 1197 | if (!dentry) |
| 1198 | goto out_err; |
| 1199 | ret = __nfsd_mkdir(d_inode(parent), dentry, S_IFDIR | 0600, ncl); |
| 1200 | if (ret) |
| 1201 | goto out_err; |
| 1202 | out: |
| 1203 | inode_unlock(dir); |
| 1204 | return dentry; |
| 1205 | out_err: |
| 1206 | dput(dentry); |
| 1207 | dentry = ERR_PTR(ret); |
| 1208 | goto out; |
| 1209 | } |
| 1210 | |
| 1211 | #if IS_ENABLED(CONFIG_SUNRPC_GSS) |
| 1212 | static int __nfsd_symlink(struct inode *dir, struct dentry *dentry, |
| 1213 | umode_t mode, const char *content) |
| 1214 | { |
| 1215 | struct inode *inode; |
| 1216 | |
| 1217 | inode = nfsd_get_inode(dir->i_sb, mode); |
| 1218 | if (!inode) |
| 1219 | return -ENOMEM; |
| 1220 | |
| 1221 | inode->i_link = (char *)content; |
| 1222 | inode->i_size = strlen(content); |
| 1223 | |
| 1224 | d_add(dentry, inode); |
| 1225 | inc_nlink(dir); |
| 1226 | fsnotify_create(dir, dentry); |
| 1227 | return 0; |
| 1228 | } |
| 1229 | |
| 1230 | /* |
| 1231 | * @content is assumed to be a NUL-terminated string that lives |
| 1232 | * longer than the symlink itself. |
| 1233 | */ |
| 1234 | static void _nfsd_symlink(struct dentry *parent, const char *name, |
| 1235 | const char *content) |
| 1236 | { |
| 1237 | struct inode *dir = parent->d_inode; |
| 1238 | struct dentry *dentry; |
| 1239 | int ret; |
| 1240 | |
| 1241 | inode_lock(dir); |
| 1242 | dentry = d_alloc_name(parent, name); |
| 1243 | if (!dentry) |
| 1244 | goto out; |
| 1245 | ret = __nfsd_symlink(d_inode(parent), dentry, S_IFLNK | 0777, content); |
| 1246 | if (ret) |
| 1247 | dput(dentry); |
| 1248 | out: |
| 1249 | inode_unlock(dir); |
| 1250 | } |
| 1251 | #else |
| 1252 | static inline void _nfsd_symlink(struct dentry *parent, const char *name, |
| 1253 | const char *content) |
| 1254 | { |
| 1255 | } |
| 1256 | |
| 1257 | #endif |
| 1258 | |
| 1259 | static void clear_ncl(struct dentry *dentry) |
| 1260 | { |
| 1261 | struct inode *inode = d_inode(dentry); |
| 1262 | struct nfsdfs_client *ncl = inode->i_private; |
| 1263 | |
| 1264 | spin_lock(&inode->i_lock); |
| 1265 | inode->i_private = NULL; |
| 1266 | spin_unlock(&inode->i_lock); |
| 1267 | kref_put(&ncl->cl_ref, ncl->cl_release); |
| 1268 | } |
| 1269 | |
| 1270 | struct nfsdfs_client *get_nfsdfs_client(struct inode *inode) |
| 1271 | { |
| 1272 | struct nfsdfs_client *nc; |
| 1273 | |
| 1274 | spin_lock(&inode->i_lock); |
| 1275 | nc = inode->i_private; |
| 1276 | if (nc) |
| 1277 | kref_get(&nc->cl_ref); |
| 1278 | spin_unlock(&inode->i_lock); |
| 1279 | return nc; |
| 1280 | } |
| 1281 | |
| 1282 | /* XXX: cut'n'paste from simple_fill_super; figure out if we could share |
| 1283 | * code instead. */ |
| 1284 | static int nfsdfs_create_files(struct dentry *root, |
| 1285 | const struct tree_descr *files, |
| 1286 | struct nfsdfs_client *ncl, |
| 1287 | struct dentry **fdentries) |
| 1288 | { |
| 1289 | struct inode *dir = d_inode(root); |
| 1290 | struct inode *inode; |
| 1291 | struct dentry *dentry; |
| 1292 | int i; |
| 1293 | |
| 1294 | inode_lock(dir); |
| 1295 | for (i = 0; files->name && files->name[0]; i++, files++) { |
| 1296 | dentry = d_alloc_name(root, files->name); |
| 1297 | if (!dentry) |
| 1298 | goto out; |
| 1299 | inode = nfsd_get_inode(d_inode(root)->i_sb, |
| 1300 | S_IFREG | files->mode); |
| 1301 | if (!inode) { |
| 1302 | dput(dentry); |
| 1303 | goto out; |
| 1304 | } |
| 1305 | kref_get(&ncl->cl_ref); |
| 1306 | inode->i_fop = files->ops; |
| 1307 | inode->i_private = ncl; |
| 1308 | d_add(dentry, inode); |
| 1309 | fsnotify_create(dir, dentry); |
| 1310 | if (fdentries) |
| 1311 | fdentries[i] = dentry; |
| 1312 | } |
| 1313 | inode_unlock(dir); |
| 1314 | return 0; |
| 1315 | out: |
| 1316 | inode_unlock(dir); |
| 1317 | return -ENOMEM; |
| 1318 | } |
| 1319 | |
| 1320 | /* on success, returns positive number unique to that client. */ |
| 1321 | struct dentry *nfsd_client_mkdir(struct nfsd_net *nn, |
| 1322 | struct nfsdfs_client *ncl, u32 id, |
| 1323 | const struct tree_descr *files, |
| 1324 | struct dentry **fdentries) |
| 1325 | { |
| 1326 | struct dentry *dentry; |
| 1327 | char name[11]; |
| 1328 | int ret; |
| 1329 | |
| 1330 | sprintf(name, "%u", id); |
| 1331 | |
| 1332 | dentry = nfsd_mkdir(nn->nfsd_client_dir, ncl, name); |
| 1333 | if (IS_ERR(dentry)) /* XXX: tossing errors? */ |
| 1334 | return NULL; |
| 1335 | ret = nfsdfs_create_files(dentry, files, ncl, fdentries); |
| 1336 | if (ret) { |
| 1337 | nfsd_client_rmdir(dentry); |
| 1338 | return NULL; |
| 1339 | } |
| 1340 | return dentry; |
| 1341 | } |
| 1342 | |
| 1343 | /* Taken from __rpc_rmdir: */ |
| 1344 | void nfsd_client_rmdir(struct dentry *dentry) |
| 1345 | { |
| 1346 | simple_recursive_removal(dentry, clear_ncl); |
| 1347 | } |
| 1348 | |
| 1349 | static int nfsd_fill_super(struct super_block *sb, struct fs_context *fc) |
| 1350 | { |
| 1351 | struct nfsd_net *nn = net_generic(current->nsproxy->net_ns, |
| 1352 | nfsd_net_id); |
| 1353 | struct dentry *dentry; |
| 1354 | int ret; |
| 1355 | |
| 1356 | static const struct tree_descr nfsd_files[] = { |
| 1357 | [NFSD_List] = {"exports", &exports_nfsd_operations, S_IRUGO}, |
| 1358 | /* Per-export io stats use same ops as exports file */ |
| 1359 | [NFSD_Export_Stats] = {"export_stats", &exports_nfsd_operations, S_IRUGO}, |
| 1360 | [NFSD_Export_features] = {"export_features", |
| 1361 | &export_features_fops, S_IRUGO}, |
| 1362 | [NFSD_FO_UnlockIP] = {"unlock_ip", |
| 1363 | &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1364 | [NFSD_FO_UnlockFS] = {"unlock_filesystem", |
| 1365 | &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1366 | [NFSD_Fh] = {"filehandle", &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1367 | [NFSD_Threads] = {"threads", &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1368 | [NFSD_Pool_Threads] = {"pool_threads", &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1369 | [NFSD_Pool_Stats] = {"pool_stats", &pool_stats_operations, S_IRUGO}, |
| 1370 | [NFSD_Reply_Cache_Stats] = {"reply_cache_stats", |
| 1371 | &nfsd_reply_cache_stats_fops, S_IRUGO}, |
| 1372 | [NFSD_Versions] = {"versions", &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1373 | [NFSD_Ports] = {"portlist", &transaction_ops, S_IWUSR|S_IRUGO}, |
| 1374 | [NFSD_MaxBlkSize] = {"max_block_size", &transaction_ops, S_IWUSR|S_IRUGO}, |
| 1375 | [NFSD_MaxConnections] = {"max_connections", &transaction_ops, S_IWUSR|S_IRUGO}, |
| 1376 | [NFSD_Filecache] = {"filecache", &nfsd_file_cache_stats_fops, S_IRUGO}, |
| 1377 | #ifdef CONFIG_NFSD_V4 |
| 1378 | [NFSD_Leasetime] = {"nfsv4leasetime", &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1379 | [NFSD_Gracetime] = {"nfsv4gracetime", &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1380 | #ifdef CONFIG_NFSD_LEGACY_CLIENT_TRACKING |
| 1381 | [NFSD_RecoveryDir] = {"nfsv4recoverydir", &transaction_ops, S_IWUSR|S_IRUSR}, |
| 1382 | #endif |
| 1383 | [NFSD_V4EndGrace] = {"v4_end_grace", &transaction_ops, S_IWUSR|S_IRUGO}, |
| 1384 | #endif |
| 1385 | /* last one */ {""} |
| 1386 | }; |
| 1387 | |
| 1388 | ret = simple_fill_super(sb, 0x6e667364, nfsd_files); |
| 1389 | if (ret) |
| 1390 | return ret; |
| 1391 | _nfsd_symlink(sb->s_root, "supported_krb5_enctypes", |
| 1392 | "/proc/net/rpc/gss_krb5_enctypes"); |
| 1393 | dentry = nfsd_mkdir(sb->s_root, NULL, "clients"); |
| 1394 | if (IS_ERR(dentry)) |
| 1395 | return PTR_ERR(dentry); |
| 1396 | nn->nfsd_client_dir = dentry; |
| 1397 | return 0; |
| 1398 | } |
| 1399 | |
| 1400 | static int nfsd_fs_get_tree(struct fs_context *fc) |
| 1401 | { |
| 1402 | return get_tree_keyed(fc, nfsd_fill_super, get_net(fc->net_ns)); |
| 1403 | } |
| 1404 | |
| 1405 | static void nfsd_fs_free_fc(struct fs_context *fc) |
| 1406 | { |
| 1407 | if (fc->s_fs_info) |
| 1408 | put_net(fc->s_fs_info); |
| 1409 | } |
| 1410 | |
| 1411 | static const struct fs_context_operations nfsd_fs_context_ops = { |
| 1412 | .free = nfsd_fs_free_fc, |
| 1413 | .get_tree = nfsd_fs_get_tree, |
| 1414 | }; |
| 1415 | |
| 1416 | static int nfsd_init_fs_context(struct fs_context *fc) |
| 1417 | { |
| 1418 | put_user_ns(fc->user_ns); |
| 1419 | fc->user_ns = get_user_ns(fc->net_ns->user_ns); |
| 1420 | fc->ops = &nfsd_fs_context_ops; |
| 1421 | return 0; |
| 1422 | } |
| 1423 | |
| 1424 | static void nfsd_umount(struct super_block *sb) |
| 1425 | { |
| 1426 | struct net *net = sb->s_fs_info; |
| 1427 | |
| 1428 | nfsd_shutdown_threads(net); |
| 1429 | |
| 1430 | kill_litter_super(sb); |
| 1431 | put_net(net); |
| 1432 | } |
| 1433 | |
| 1434 | static struct file_system_type nfsd_fs_type = { |
| 1435 | .owner = THIS_MODULE, |
| 1436 | .name = "nfsd", |
| 1437 | .init_fs_context = nfsd_init_fs_context, |
| 1438 | .kill_sb = nfsd_umount, |
| 1439 | }; |
| 1440 | MODULE_ALIAS_FS("nfsd"); |
| 1441 | |
| 1442 | #ifdef CONFIG_PROC_FS |
| 1443 | |
| 1444 | static int exports_proc_open(struct inode *inode, struct file *file) |
| 1445 | { |
| 1446 | return exports_net_open(current->nsproxy->net_ns, file); |
| 1447 | } |
| 1448 | |
| 1449 | static const struct proc_ops exports_proc_ops = { |
| 1450 | .proc_open = exports_proc_open, |
| 1451 | .proc_read = seq_read, |
| 1452 | .proc_lseek = seq_lseek, |
| 1453 | .proc_release = seq_release, |
| 1454 | }; |
| 1455 | |
| 1456 | static int create_proc_exports_entry(void) |
| 1457 | { |
| 1458 | struct proc_dir_entry *entry; |
| 1459 | |
| 1460 | entry = proc_mkdir("fs/nfs", NULL); |
| 1461 | if (!entry) |
| 1462 | return -ENOMEM; |
| 1463 | entry = proc_create("exports", 0, entry, &exports_proc_ops); |
| 1464 | if (!entry) { |
| 1465 | remove_proc_entry("fs/nfs", NULL); |
| 1466 | return -ENOMEM; |
| 1467 | } |
| 1468 | return 0; |
| 1469 | } |
| 1470 | #else /* CONFIG_PROC_FS */ |
| 1471 | static int create_proc_exports_entry(void) |
| 1472 | { |
| 1473 | return 0; |
| 1474 | } |
| 1475 | #endif |
| 1476 | |
| 1477 | unsigned int nfsd_net_id; |
| 1478 | |
| 1479 | static int nfsd_genl_rpc_status_compose_msg(struct sk_buff *skb, |
| 1480 | struct netlink_callback *cb, |
| 1481 | struct nfsd_genl_rqstp *rqstp) |
| 1482 | { |
| 1483 | void *hdr; |
| 1484 | u32 i; |
| 1485 | |
| 1486 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
| 1487 | &nfsd_nl_family, 0, NFSD_CMD_RPC_STATUS_GET); |
| 1488 | if (!hdr) |
| 1489 | return -ENOBUFS; |
| 1490 | |
| 1491 | if (nla_put_be32(skb, NFSD_A_RPC_STATUS_XID, rqstp->rq_xid) || |
| 1492 | nla_put_u32(skb, NFSD_A_RPC_STATUS_FLAGS, rqstp->rq_flags) || |
| 1493 | nla_put_u32(skb, NFSD_A_RPC_STATUS_PROG, rqstp->rq_prog) || |
| 1494 | nla_put_u32(skb, NFSD_A_RPC_STATUS_PROC, rqstp->rq_proc) || |
| 1495 | nla_put_u8(skb, NFSD_A_RPC_STATUS_VERSION, rqstp->rq_vers) || |
| 1496 | nla_put_s64(skb, NFSD_A_RPC_STATUS_SERVICE_TIME, |
| 1497 | ktime_to_us(rqstp->rq_stime), |
| 1498 | NFSD_A_RPC_STATUS_PAD)) |
| 1499 | return -ENOBUFS; |
| 1500 | |
| 1501 | switch (rqstp->rq_saddr.sa_family) { |
| 1502 | case AF_INET: { |
| 1503 | const struct sockaddr_in *s_in, *d_in; |
| 1504 | |
| 1505 | s_in = (const struct sockaddr_in *)&rqstp->rq_saddr; |
| 1506 | d_in = (const struct sockaddr_in *)&rqstp->rq_daddr; |
| 1507 | if (nla_put_in_addr(skb, NFSD_A_RPC_STATUS_SADDR4, |
| 1508 | s_in->sin_addr.s_addr) || |
| 1509 | nla_put_in_addr(skb, NFSD_A_RPC_STATUS_DADDR4, |
| 1510 | d_in->sin_addr.s_addr) || |
| 1511 | nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT, |
| 1512 | s_in->sin_port) || |
| 1513 | nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT, |
| 1514 | d_in->sin_port)) |
| 1515 | return -ENOBUFS; |
| 1516 | break; |
| 1517 | } |
| 1518 | case AF_INET6: { |
| 1519 | const struct sockaddr_in6 *s_in, *d_in; |
| 1520 | |
| 1521 | s_in = (const struct sockaddr_in6 *)&rqstp->rq_saddr; |
| 1522 | d_in = (const struct sockaddr_in6 *)&rqstp->rq_daddr; |
| 1523 | if (nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_SADDR6, |
| 1524 | &s_in->sin6_addr) || |
| 1525 | nla_put_in6_addr(skb, NFSD_A_RPC_STATUS_DADDR6, |
| 1526 | &d_in->sin6_addr) || |
| 1527 | nla_put_be16(skb, NFSD_A_RPC_STATUS_SPORT, |
| 1528 | s_in->sin6_port) || |
| 1529 | nla_put_be16(skb, NFSD_A_RPC_STATUS_DPORT, |
| 1530 | d_in->sin6_port)) |
| 1531 | return -ENOBUFS; |
| 1532 | break; |
| 1533 | } |
| 1534 | } |
| 1535 | |
| 1536 | for (i = 0; i < rqstp->rq_opcnt; i++) |
| 1537 | if (nla_put_u32(skb, NFSD_A_RPC_STATUS_COMPOUND_OPS, |
| 1538 | rqstp->rq_opnum[i])) |
| 1539 | return -ENOBUFS; |
| 1540 | |
| 1541 | genlmsg_end(skb, hdr); |
| 1542 | return 0; |
| 1543 | } |
| 1544 | |
| 1545 | /** |
| 1546 | * nfsd_nl_rpc_status_get_dumpit - Handle rpc_status_get dumpit |
| 1547 | * @skb: reply buffer |
| 1548 | * @cb: netlink metadata and command arguments |
| 1549 | * |
| 1550 | * Returns the size of the reply or a negative errno. |
| 1551 | */ |
| 1552 | int nfsd_nl_rpc_status_get_dumpit(struct sk_buff *skb, |
| 1553 | struct netlink_callback *cb) |
| 1554 | { |
| 1555 | int i, ret, rqstp_index = 0; |
| 1556 | struct nfsd_net *nn; |
| 1557 | |
| 1558 | mutex_lock(&nfsd_mutex); |
| 1559 | |
| 1560 | nn = net_generic(sock_net(skb->sk), nfsd_net_id); |
| 1561 | if (!nn->nfsd_serv) { |
| 1562 | ret = -ENODEV; |
| 1563 | goto out_unlock; |
| 1564 | } |
| 1565 | |
| 1566 | rcu_read_lock(); |
| 1567 | |
| 1568 | for (i = 0; i < nn->nfsd_serv->sv_nrpools; i++) { |
| 1569 | struct svc_rqst *rqstp; |
| 1570 | |
| 1571 | if (i < cb->args[0]) /* already consumed */ |
| 1572 | continue; |
| 1573 | |
| 1574 | rqstp_index = 0; |
| 1575 | list_for_each_entry_rcu(rqstp, |
| 1576 | &nn->nfsd_serv->sv_pools[i].sp_all_threads, |
| 1577 | rq_all) { |
| 1578 | struct nfsd_genl_rqstp genl_rqstp; |
| 1579 | unsigned int status_counter; |
| 1580 | |
| 1581 | if (rqstp_index++ < cb->args[1]) /* already consumed */ |
| 1582 | continue; |
| 1583 | /* |
| 1584 | * Acquire rq_status_counter before parsing the rqst |
| 1585 | * fields. rq_status_counter is set to an odd value in |
| 1586 | * order to notify the consumers the rqstp fields are |
| 1587 | * meaningful. |
| 1588 | */ |
| 1589 | status_counter = |
| 1590 | smp_load_acquire(&rqstp->rq_status_counter); |
| 1591 | if (!(status_counter & 1)) |
| 1592 | continue; |
| 1593 | |
| 1594 | genl_rqstp.rq_xid = rqstp->rq_xid; |
| 1595 | genl_rqstp.rq_flags = rqstp->rq_flags; |
| 1596 | genl_rqstp.rq_vers = rqstp->rq_vers; |
| 1597 | genl_rqstp.rq_prog = rqstp->rq_prog; |
| 1598 | genl_rqstp.rq_proc = rqstp->rq_proc; |
| 1599 | genl_rqstp.rq_stime = rqstp->rq_stime; |
| 1600 | genl_rqstp.rq_opcnt = 0; |
| 1601 | memcpy(&genl_rqstp.rq_daddr, svc_daddr(rqstp), |
| 1602 | sizeof(struct sockaddr)); |
| 1603 | memcpy(&genl_rqstp.rq_saddr, svc_addr(rqstp), |
| 1604 | sizeof(struct sockaddr)); |
| 1605 | |
| 1606 | #ifdef CONFIG_NFSD_V4 |
| 1607 | if (rqstp->rq_vers == NFS4_VERSION && |
| 1608 | rqstp->rq_proc == NFSPROC4_COMPOUND) { |
| 1609 | /* NFSv4 compound */ |
| 1610 | struct nfsd4_compoundargs *args; |
| 1611 | int j; |
| 1612 | |
| 1613 | args = rqstp->rq_argp; |
| 1614 | genl_rqstp.rq_opcnt = args->opcnt; |
| 1615 | for (j = 0; j < genl_rqstp.rq_opcnt; j++) |
| 1616 | genl_rqstp.rq_opnum[j] = |
| 1617 | args->ops[j].opnum; |
| 1618 | } |
| 1619 | #endif /* CONFIG_NFSD_V4 */ |
| 1620 | |
| 1621 | /* |
| 1622 | * Acquire rq_status_counter before reporting the rqst |
| 1623 | * fields to the user. |
| 1624 | */ |
| 1625 | if (smp_load_acquire(&rqstp->rq_status_counter) != |
| 1626 | status_counter) |
| 1627 | continue; |
| 1628 | |
| 1629 | ret = nfsd_genl_rpc_status_compose_msg(skb, cb, |
| 1630 | &genl_rqstp); |
| 1631 | if (ret) |
| 1632 | goto out; |
| 1633 | } |
| 1634 | } |
| 1635 | |
| 1636 | cb->args[0] = i; |
| 1637 | cb->args[1] = rqstp_index; |
| 1638 | ret = skb->len; |
| 1639 | out: |
| 1640 | rcu_read_unlock(); |
| 1641 | out_unlock: |
| 1642 | mutex_unlock(&nfsd_mutex); |
| 1643 | |
| 1644 | return ret; |
| 1645 | } |
| 1646 | |
| 1647 | /** |
| 1648 | * nfsd_nl_threads_set_doit - set the number of running threads |
| 1649 | * @skb: reply buffer |
| 1650 | * @info: netlink metadata and command arguments |
| 1651 | * |
| 1652 | * Return 0 on success or a negative errno. |
| 1653 | */ |
| 1654 | int nfsd_nl_threads_set_doit(struct sk_buff *skb, struct genl_info *info) |
| 1655 | { |
| 1656 | int *nthreads, count = 0, nrpools, i, ret = -EOPNOTSUPP, rem; |
| 1657 | struct net *net = genl_info_net(info); |
| 1658 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 1659 | const struct nlattr *attr; |
| 1660 | const char *scope = NULL; |
| 1661 | |
| 1662 | if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_THREADS)) |
| 1663 | return -EINVAL; |
| 1664 | |
| 1665 | /* count number of SERVER_THREADS values */ |
| 1666 | nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) { |
| 1667 | if (nla_type(attr) == NFSD_A_SERVER_THREADS) |
| 1668 | count++; |
| 1669 | } |
| 1670 | |
| 1671 | mutex_lock(&nfsd_mutex); |
| 1672 | |
| 1673 | nrpools = max(count, nfsd_nrpools(net)); |
| 1674 | nthreads = kcalloc(nrpools, sizeof(int), GFP_KERNEL); |
| 1675 | if (!nthreads) { |
| 1676 | ret = -ENOMEM; |
| 1677 | goto out_unlock; |
| 1678 | } |
| 1679 | |
| 1680 | i = 0; |
| 1681 | nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) { |
| 1682 | if (nla_type(attr) == NFSD_A_SERVER_THREADS) { |
| 1683 | nthreads[i++] = nla_get_u32(attr); |
| 1684 | if (i >= nrpools) |
| 1685 | break; |
| 1686 | } |
| 1687 | } |
| 1688 | |
| 1689 | if (info->attrs[NFSD_A_SERVER_GRACETIME] || |
| 1690 | info->attrs[NFSD_A_SERVER_LEASETIME] || |
| 1691 | info->attrs[NFSD_A_SERVER_SCOPE]) { |
| 1692 | ret = -EBUSY; |
| 1693 | if (nn->nfsd_serv && nn->nfsd_serv->sv_nrthreads) |
| 1694 | goto out_unlock; |
| 1695 | |
| 1696 | ret = -EINVAL; |
| 1697 | attr = info->attrs[NFSD_A_SERVER_GRACETIME]; |
| 1698 | if (attr) { |
| 1699 | u32 gracetime = nla_get_u32(attr); |
| 1700 | |
| 1701 | if (gracetime < 10 || gracetime > 3600) |
| 1702 | goto out_unlock; |
| 1703 | |
| 1704 | nn->nfsd4_grace = gracetime; |
| 1705 | } |
| 1706 | |
| 1707 | attr = info->attrs[NFSD_A_SERVER_LEASETIME]; |
| 1708 | if (attr) { |
| 1709 | u32 leasetime = nla_get_u32(attr); |
| 1710 | |
| 1711 | if (leasetime < 10 || leasetime > 3600) |
| 1712 | goto out_unlock; |
| 1713 | |
| 1714 | nn->nfsd4_lease = leasetime; |
| 1715 | } |
| 1716 | |
| 1717 | attr = info->attrs[NFSD_A_SERVER_SCOPE]; |
| 1718 | if (attr) |
| 1719 | scope = nla_data(attr); |
| 1720 | } |
| 1721 | |
| 1722 | ret = nfsd_svc(nrpools, nthreads, net, get_current_cred(), scope); |
| 1723 | if (ret > 0) |
| 1724 | ret = 0; |
| 1725 | out_unlock: |
| 1726 | mutex_unlock(&nfsd_mutex); |
| 1727 | kfree(nthreads); |
| 1728 | return ret; |
| 1729 | } |
| 1730 | |
| 1731 | /** |
| 1732 | * nfsd_nl_threads_get_doit - get the number of running threads |
| 1733 | * @skb: reply buffer |
| 1734 | * @info: netlink metadata and command arguments |
| 1735 | * |
| 1736 | * Return 0 on success or a negative errno. |
| 1737 | */ |
| 1738 | int nfsd_nl_threads_get_doit(struct sk_buff *skb, struct genl_info *info) |
| 1739 | { |
| 1740 | struct net *net = genl_info_net(info); |
| 1741 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 1742 | void *hdr; |
| 1743 | int err; |
| 1744 | |
| 1745 | skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1746 | if (!skb) |
| 1747 | return -ENOMEM; |
| 1748 | |
| 1749 | hdr = genlmsg_iput(skb, info); |
| 1750 | if (!hdr) { |
| 1751 | err = -EMSGSIZE; |
| 1752 | goto err_free_msg; |
| 1753 | } |
| 1754 | |
| 1755 | mutex_lock(&nfsd_mutex); |
| 1756 | |
| 1757 | err = nla_put_u32(skb, NFSD_A_SERVER_GRACETIME, |
| 1758 | nn->nfsd4_grace) || |
| 1759 | nla_put_u32(skb, NFSD_A_SERVER_LEASETIME, |
| 1760 | nn->nfsd4_lease) || |
| 1761 | nla_put_string(skb, NFSD_A_SERVER_SCOPE, |
| 1762 | nn->nfsd_name); |
| 1763 | if (err) |
| 1764 | goto err_unlock; |
| 1765 | |
| 1766 | if (nn->nfsd_serv) { |
| 1767 | int i; |
| 1768 | |
| 1769 | for (i = 0; i < nfsd_nrpools(net); ++i) { |
| 1770 | struct svc_pool *sp = &nn->nfsd_serv->sv_pools[i]; |
| 1771 | |
| 1772 | err = nla_put_u32(skb, NFSD_A_SERVER_THREADS, |
| 1773 | sp->sp_nrthreads); |
| 1774 | if (err) |
| 1775 | goto err_unlock; |
| 1776 | } |
| 1777 | } else { |
| 1778 | err = nla_put_u32(skb, NFSD_A_SERVER_THREADS, 0); |
| 1779 | if (err) |
| 1780 | goto err_unlock; |
| 1781 | } |
| 1782 | |
| 1783 | mutex_unlock(&nfsd_mutex); |
| 1784 | |
| 1785 | genlmsg_end(skb, hdr); |
| 1786 | |
| 1787 | return genlmsg_reply(skb, info); |
| 1788 | |
| 1789 | err_unlock: |
| 1790 | mutex_unlock(&nfsd_mutex); |
| 1791 | err_free_msg: |
| 1792 | nlmsg_free(skb); |
| 1793 | |
| 1794 | return err; |
| 1795 | } |
| 1796 | |
| 1797 | /** |
| 1798 | * nfsd_nl_version_set_doit - set the nfs enabled versions |
| 1799 | * @skb: reply buffer |
| 1800 | * @info: netlink metadata and command arguments |
| 1801 | * |
| 1802 | * Return 0 on success or a negative errno. |
| 1803 | */ |
| 1804 | int nfsd_nl_version_set_doit(struct sk_buff *skb, struct genl_info *info) |
| 1805 | { |
| 1806 | const struct nlattr *attr; |
| 1807 | struct nfsd_net *nn; |
| 1808 | int i, rem; |
| 1809 | |
| 1810 | if (GENL_REQ_ATTR_CHECK(info, NFSD_A_SERVER_PROTO_VERSION)) |
| 1811 | return -EINVAL; |
| 1812 | |
| 1813 | mutex_lock(&nfsd_mutex); |
| 1814 | |
| 1815 | nn = net_generic(genl_info_net(info), nfsd_net_id); |
| 1816 | if (nn->nfsd_serv) { |
| 1817 | mutex_unlock(&nfsd_mutex); |
| 1818 | return -EBUSY; |
| 1819 | } |
| 1820 | |
| 1821 | /* clear current supported versions. */ |
| 1822 | nfsd_vers(nn, 2, NFSD_CLEAR); |
| 1823 | nfsd_vers(nn, 3, NFSD_CLEAR); |
| 1824 | for (i = 0; i <= NFSD_SUPPORTED_MINOR_VERSION; i++) |
| 1825 | nfsd_minorversion(nn, i, NFSD_CLEAR); |
| 1826 | |
| 1827 | nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) { |
| 1828 | struct nlattr *tb[NFSD_A_VERSION_MAX + 1]; |
| 1829 | u32 major, minor = 0; |
| 1830 | bool enabled; |
| 1831 | |
| 1832 | if (nla_type(attr) != NFSD_A_SERVER_PROTO_VERSION) |
| 1833 | continue; |
| 1834 | |
| 1835 | if (nla_parse_nested(tb, NFSD_A_VERSION_MAX, attr, |
| 1836 | nfsd_version_nl_policy, info->extack) < 0) |
| 1837 | continue; |
| 1838 | |
| 1839 | if (!tb[NFSD_A_VERSION_MAJOR]) |
| 1840 | continue; |
| 1841 | |
| 1842 | major = nla_get_u32(tb[NFSD_A_VERSION_MAJOR]); |
| 1843 | if (tb[NFSD_A_VERSION_MINOR]) |
| 1844 | minor = nla_get_u32(tb[NFSD_A_VERSION_MINOR]); |
| 1845 | |
| 1846 | enabled = nla_get_flag(tb[NFSD_A_VERSION_ENABLED]); |
| 1847 | |
| 1848 | switch (major) { |
| 1849 | case 4: |
| 1850 | nfsd_minorversion(nn, minor, enabled ? NFSD_SET : NFSD_CLEAR); |
| 1851 | break; |
| 1852 | case 3: |
| 1853 | case 2: |
| 1854 | if (!minor) |
| 1855 | nfsd_vers(nn, major, enabled ? NFSD_SET : NFSD_CLEAR); |
| 1856 | break; |
| 1857 | default: |
| 1858 | break; |
| 1859 | } |
| 1860 | } |
| 1861 | |
| 1862 | mutex_unlock(&nfsd_mutex); |
| 1863 | |
| 1864 | return 0; |
| 1865 | } |
| 1866 | |
| 1867 | /** |
| 1868 | * nfsd_nl_version_get_doit - get the enabled status for all supported nfs versions |
| 1869 | * @skb: reply buffer |
| 1870 | * @info: netlink metadata and command arguments |
| 1871 | * |
| 1872 | * Return 0 on success or a negative errno. |
| 1873 | */ |
| 1874 | int nfsd_nl_version_get_doit(struct sk_buff *skb, struct genl_info *info) |
| 1875 | { |
| 1876 | struct nfsd_net *nn; |
| 1877 | int i, err; |
| 1878 | void *hdr; |
| 1879 | |
| 1880 | skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 1881 | if (!skb) |
| 1882 | return -ENOMEM; |
| 1883 | |
| 1884 | hdr = genlmsg_iput(skb, info); |
| 1885 | if (!hdr) { |
| 1886 | err = -EMSGSIZE; |
| 1887 | goto err_free_msg; |
| 1888 | } |
| 1889 | |
| 1890 | mutex_lock(&nfsd_mutex); |
| 1891 | nn = net_generic(genl_info_net(info), nfsd_net_id); |
| 1892 | |
| 1893 | for (i = 2; i <= 4; i++) { |
| 1894 | int j; |
| 1895 | |
| 1896 | for (j = 0; j <= NFSD_SUPPORTED_MINOR_VERSION; j++) { |
| 1897 | struct nlattr *attr; |
| 1898 | |
| 1899 | /* Don't record any versions the kernel doesn't have |
| 1900 | * compiled in |
| 1901 | */ |
| 1902 | if (!nfsd_support_version(i)) |
| 1903 | continue; |
| 1904 | |
| 1905 | /* NFSv{2,3} does not support minor numbers */ |
| 1906 | if (i < 4 && j) |
| 1907 | continue; |
| 1908 | |
| 1909 | attr = nla_nest_start(skb, |
| 1910 | NFSD_A_SERVER_PROTO_VERSION); |
| 1911 | if (!attr) { |
| 1912 | err = -EINVAL; |
| 1913 | goto err_nfsd_unlock; |
| 1914 | } |
| 1915 | |
| 1916 | if (nla_put_u32(skb, NFSD_A_VERSION_MAJOR, i) || |
| 1917 | nla_put_u32(skb, NFSD_A_VERSION_MINOR, j)) { |
| 1918 | err = -EINVAL; |
| 1919 | goto err_nfsd_unlock; |
| 1920 | } |
| 1921 | |
| 1922 | /* Set the enabled flag if the version is enabled */ |
| 1923 | if (nfsd_vers(nn, i, NFSD_TEST) && |
| 1924 | (i < 4 || nfsd_minorversion(nn, j, NFSD_TEST)) && |
| 1925 | nla_put_flag(skb, NFSD_A_VERSION_ENABLED)) { |
| 1926 | err = -EINVAL; |
| 1927 | goto err_nfsd_unlock; |
| 1928 | } |
| 1929 | |
| 1930 | nla_nest_end(skb, attr); |
| 1931 | } |
| 1932 | } |
| 1933 | |
| 1934 | mutex_unlock(&nfsd_mutex); |
| 1935 | genlmsg_end(skb, hdr); |
| 1936 | |
| 1937 | return genlmsg_reply(skb, info); |
| 1938 | |
| 1939 | err_nfsd_unlock: |
| 1940 | mutex_unlock(&nfsd_mutex); |
| 1941 | err_free_msg: |
| 1942 | nlmsg_free(skb); |
| 1943 | |
| 1944 | return err; |
| 1945 | } |
| 1946 | |
| 1947 | /** |
| 1948 | * nfsd_nl_listener_set_doit - set the nfs running sockets |
| 1949 | * @skb: reply buffer |
| 1950 | * @info: netlink metadata and command arguments |
| 1951 | * |
| 1952 | * Return 0 on success or a negative errno. |
| 1953 | */ |
| 1954 | int nfsd_nl_listener_set_doit(struct sk_buff *skb, struct genl_info *info) |
| 1955 | { |
| 1956 | struct net *net = genl_info_net(info); |
| 1957 | struct svc_xprt *xprt, *tmp; |
| 1958 | const struct nlattr *attr; |
| 1959 | struct svc_serv *serv; |
| 1960 | LIST_HEAD(permsocks); |
| 1961 | struct nfsd_net *nn; |
| 1962 | int err, rem; |
| 1963 | |
| 1964 | mutex_lock(&nfsd_mutex); |
| 1965 | |
| 1966 | err = nfsd_create_serv(net); |
| 1967 | if (err) { |
| 1968 | mutex_unlock(&nfsd_mutex); |
| 1969 | return err; |
| 1970 | } |
| 1971 | |
| 1972 | nn = net_generic(net, nfsd_net_id); |
| 1973 | serv = nn->nfsd_serv; |
| 1974 | |
| 1975 | spin_lock_bh(&serv->sv_lock); |
| 1976 | |
| 1977 | /* Move all of the old listener sockets to a temp list */ |
| 1978 | list_splice_init(&serv->sv_permsocks, &permsocks); |
| 1979 | |
| 1980 | /* |
| 1981 | * Walk the list of server_socks from userland and move any that match |
| 1982 | * back to sv_permsocks |
| 1983 | */ |
| 1984 | nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) { |
| 1985 | struct nlattr *tb[NFSD_A_SOCK_MAX + 1]; |
| 1986 | const char *xcl_name; |
| 1987 | struct sockaddr *sa; |
| 1988 | |
| 1989 | if (nla_type(attr) != NFSD_A_SERVER_SOCK_ADDR) |
| 1990 | continue; |
| 1991 | |
| 1992 | if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr, |
| 1993 | nfsd_sock_nl_policy, info->extack) < 0) |
| 1994 | continue; |
| 1995 | |
| 1996 | if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME]) |
| 1997 | continue; |
| 1998 | |
| 1999 | if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa)) |
| 2000 | continue; |
| 2001 | |
| 2002 | xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]); |
| 2003 | sa = nla_data(tb[NFSD_A_SOCK_ADDR]); |
| 2004 | |
| 2005 | /* Put back any matching sockets */ |
| 2006 | list_for_each_entry_safe(xprt, tmp, &permsocks, xpt_list) { |
| 2007 | /* This shouldn't be possible */ |
| 2008 | if (WARN_ON_ONCE(xprt->xpt_net != net)) { |
| 2009 | list_move(&xprt->xpt_list, &serv->sv_permsocks); |
| 2010 | continue; |
| 2011 | } |
| 2012 | |
| 2013 | /* If everything matches, put it back */ |
| 2014 | if (!strcmp(xprt->xpt_class->xcl_name, xcl_name) && |
| 2015 | rpc_cmp_addr_port(sa, (struct sockaddr *)&xprt->xpt_local)) { |
| 2016 | list_move(&xprt->xpt_list, &serv->sv_permsocks); |
| 2017 | break; |
| 2018 | } |
| 2019 | } |
| 2020 | } |
| 2021 | |
| 2022 | /* For now, no removing old sockets while server is running */ |
| 2023 | if (serv->sv_nrthreads && !list_empty(&permsocks)) { |
| 2024 | list_splice_init(&permsocks, &serv->sv_permsocks); |
| 2025 | spin_unlock_bh(&serv->sv_lock); |
| 2026 | err = -EBUSY; |
| 2027 | goto out_unlock_mtx; |
| 2028 | } |
| 2029 | |
| 2030 | /* Close the remaining sockets on the permsocks list */ |
| 2031 | while (!list_empty(&permsocks)) { |
| 2032 | xprt = list_first_entry(&permsocks, struct svc_xprt, xpt_list); |
| 2033 | list_move(&xprt->xpt_list, &serv->sv_permsocks); |
| 2034 | |
| 2035 | /* |
| 2036 | * Newly-created sockets are born with the BUSY bit set. Clear |
| 2037 | * it if there are no threads, since nothing can pick it up |
| 2038 | * in that case. |
| 2039 | */ |
| 2040 | if (!serv->sv_nrthreads) |
| 2041 | clear_bit(XPT_BUSY, &xprt->xpt_flags); |
| 2042 | |
| 2043 | set_bit(XPT_CLOSE, &xprt->xpt_flags); |
| 2044 | spin_unlock_bh(&serv->sv_lock); |
| 2045 | svc_xprt_close(xprt); |
| 2046 | spin_lock_bh(&serv->sv_lock); |
| 2047 | } |
| 2048 | |
| 2049 | spin_unlock_bh(&serv->sv_lock); |
| 2050 | |
| 2051 | /* walk list of addrs again, open any that still don't exist */ |
| 2052 | nlmsg_for_each_attr(attr, info->nlhdr, GENL_HDRLEN, rem) { |
| 2053 | struct nlattr *tb[NFSD_A_SOCK_MAX + 1]; |
| 2054 | const char *xcl_name; |
| 2055 | struct sockaddr *sa; |
| 2056 | int ret; |
| 2057 | |
| 2058 | if (nla_type(attr) != NFSD_A_SERVER_SOCK_ADDR) |
| 2059 | continue; |
| 2060 | |
| 2061 | if (nla_parse_nested(tb, NFSD_A_SOCK_MAX, attr, |
| 2062 | nfsd_sock_nl_policy, info->extack) < 0) |
| 2063 | continue; |
| 2064 | |
| 2065 | if (!tb[NFSD_A_SOCK_ADDR] || !tb[NFSD_A_SOCK_TRANSPORT_NAME]) |
| 2066 | continue; |
| 2067 | |
| 2068 | if (nla_len(tb[NFSD_A_SOCK_ADDR]) < sizeof(*sa)) |
| 2069 | continue; |
| 2070 | |
| 2071 | xcl_name = nla_data(tb[NFSD_A_SOCK_TRANSPORT_NAME]); |
| 2072 | sa = nla_data(tb[NFSD_A_SOCK_ADDR]); |
| 2073 | |
| 2074 | xprt = svc_find_listener(serv, xcl_name, net, sa); |
| 2075 | if (xprt) { |
| 2076 | svc_xprt_put(xprt); |
| 2077 | continue; |
| 2078 | } |
| 2079 | |
| 2080 | ret = svc_xprt_create_from_sa(serv, xcl_name, net, sa, 0, |
| 2081 | get_current_cred()); |
| 2082 | /* always save the latest error */ |
| 2083 | if (ret < 0) |
| 2084 | err = ret; |
| 2085 | } |
| 2086 | |
| 2087 | if (!serv->sv_nrthreads && list_empty(&nn->nfsd_serv->sv_permsocks)) |
| 2088 | nfsd_destroy_serv(net); |
| 2089 | |
| 2090 | out_unlock_mtx: |
| 2091 | mutex_unlock(&nfsd_mutex); |
| 2092 | |
| 2093 | return err; |
| 2094 | } |
| 2095 | |
| 2096 | /** |
| 2097 | * nfsd_nl_listener_get_doit - get the nfs running listeners |
| 2098 | * @skb: reply buffer |
| 2099 | * @info: netlink metadata and command arguments |
| 2100 | * |
| 2101 | * Return 0 on success or a negative errno. |
| 2102 | */ |
| 2103 | int nfsd_nl_listener_get_doit(struct sk_buff *skb, struct genl_info *info) |
| 2104 | { |
| 2105 | struct svc_xprt *xprt; |
| 2106 | struct svc_serv *serv; |
| 2107 | struct nfsd_net *nn; |
| 2108 | void *hdr; |
| 2109 | int err; |
| 2110 | |
| 2111 | skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 2112 | if (!skb) |
| 2113 | return -ENOMEM; |
| 2114 | |
| 2115 | hdr = genlmsg_iput(skb, info); |
| 2116 | if (!hdr) { |
| 2117 | err = -EMSGSIZE; |
| 2118 | goto err_free_msg; |
| 2119 | } |
| 2120 | |
| 2121 | mutex_lock(&nfsd_mutex); |
| 2122 | nn = net_generic(genl_info_net(info), nfsd_net_id); |
| 2123 | |
| 2124 | /* no nfs server? Just send empty socket list */ |
| 2125 | if (!nn->nfsd_serv) |
| 2126 | goto out_unlock_mtx; |
| 2127 | |
| 2128 | serv = nn->nfsd_serv; |
| 2129 | spin_lock_bh(&serv->sv_lock); |
| 2130 | list_for_each_entry(xprt, &serv->sv_permsocks, xpt_list) { |
| 2131 | struct nlattr *attr; |
| 2132 | |
| 2133 | attr = nla_nest_start(skb, NFSD_A_SERVER_SOCK_ADDR); |
| 2134 | if (!attr) { |
| 2135 | err = -EINVAL; |
| 2136 | goto err_serv_unlock; |
| 2137 | } |
| 2138 | |
| 2139 | if (nla_put_string(skb, NFSD_A_SOCK_TRANSPORT_NAME, |
| 2140 | xprt->xpt_class->xcl_name) || |
| 2141 | nla_put(skb, NFSD_A_SOCK_ADDR, |
| 2142 | sizeof(struct sockaddr_storage), |
| 2143 | &xprt->xpt_local)) { |
| 2144 | err = -EINVAL; |
| 2145 | goto err_serv_unlock; |
| 2146 | } |
| 2147 | |
| 2148 | nla_nest_end(skb, attr); |
| 2149 | } |
| 2150 | spin_unlock_bh(&serv->sv_lock); |
| 2151 | out_unlock_mtx: |
| 2152 | mutex_unlock(&nfsd_mutex); |
| 2153 | genlmsg_end(skb, hdr); |
| 2154 | |
| 2155 | return genlmsg_reply(skb, info); |
| 2156 | |
| 2157 | err_serv_unlock: |
| 2158 | spin_unlock_bh(&serv->sv_lock); |
| 2159 | mutex_unlock(&nfsd_mutex); |
| 2160 | err_free_msg: |
| 2161 | nlmsg_free(skb); |
| 2162 | |
| 2163 | return err; |
| 2164 | } |
| 2165 | |
| 2166 | /** |
| 2167 | * nfsd_nl_pool_mode_set_doit - set the number of running threads |
| 2168 | * @skb: reply buffer |
| 2169 | * @info: netlink metadata and command arguments |
| 2170 | * |
| 2171 | * Return 0 on success or a negative errno. |
| 2172 | */ |
| 2173 | int nfsd_nl_pool_mode_set_doit(struct sk_buff *skb, struct genl_info *info) |
| 2174 | { |
| 2175 | const struct nlattr *attr; |
| 2176 | |
| 2177 | if (GENL_REQ_ATTR_CHECK(info, NFSD_A_POOL_MODE_MODE)) |
| 2178 | return -EINVAL; |
| 2179 | |
| 2180 | attr = info->attrs[NFSD_A_POOL_MODE_MODE]; |
| 2181 | return sunrpc_set_pool_mode(nla_data(attr)); |
| 2182 | } |
| 2183 | |
| 2184 | /** |
| 2185 | * nfsd_nl_pool_mode_get_doit - get info about pool_mode |
| 2186 | * @skb: reply buffer |
| 2187 | * @info: netlink metadata and command arguments |
| 2188 | * |
| 2189 | * Return 0 on success or a negative errno. |
| 2190 | */ |
| 2191 | int nfsd_nl_pool_mode_get_doit(struct sk_buff *skb, struct genl_info *info) |
| 2192 | { |
| 2193 | struct net *net = genl_info_net(info); |
| 2194 | char buf[16]; |
| 2195 | void *hdr; |
| 2196 | int err; |
| 2197 | |
| 2198 | if (sunrpc_get_pool_mode(buf, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf)) |
| 2199 | return -ERANGE; |
| 2200 | |
| 2201 | skb = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| 2202 | if (!skb) |
| 2203 | return -ENOMEM; |
| 2204 | |
| 2205 | err = -EMSGSIZE; |
| 2206 | hdr = genlmsg_iput(skb, info); |
| 2207 | if (!hdr) |
| 2208 | goto err_free_msg; |
| 2209 | |
| 2210 | err = nla_put_string(skb, NFSD_A_POOL_MODE_MODE, buf) | |
| 2211 | nla_put_u32(skb, NFSD_A_POOL_MODE_NPOOLS, nfsd_nrpools(net)); |
| 2212 | if (err) |
| 2213 | goto err_free_msg; |
| 2214 | |
| 2215 | genlmsg_end(skb, hdr); |
| 2216 | return genlmsg_reply(skb, info); |
| 2217 | |
| 2218 | err_free_msg: |
| 2219 | nlmsg_free(skb); |
| 2220 | return err; |
| 2221 | } |
| 2222 | |
| 2223 | /** |
| 2224 | * nfsd_net_init - Prepare the nfsd_net portion of a new net namespace |
| 2225 | * @net: a freshly-created network namespace |
| 2226 | * |
| 2227 | * This information stays around as long as the network namespace is |
| 2228 | * alive whether or not there is an NFSD instance running in the |
| 2229 | * namespace. |
| 2230 | * |
| 2231 | * Returns zero on success, or a negative errno otherwise. |
| 2232 | */ |
| 2233 | static __net_init int nfsd_net_init(struct net *net) |
| 2234 | { |
| 2235 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 2236 | int retval; |
| 2237 | int i; |
| 2238 | |
| 2239 | retval = nfsd_export_init(net); |
| 2240 | if (retval) |
| 2241 | goto out_export_error; |
| 2242 | retval = nfsd_idmap_init(net); |
| 2243 | if (retval) |
| 2244 | goto out_idmap_error; |
| 2245 | retval = percpu_counter_init_many(nn->counter, 0, GFP_KERNEL, |
| 2246 | NFSD_STATS_COUNTERS_NUM); |
| 2247 | if (retval) |
| 2248 | goto out_repcache_error; |
| 2249 | memset(&nn->nfsd_svcstats, 0, sizeof(nn->nfsd_svcstats)); |
| 2250 | nn->nfsd_svcstats.program = &nfsd_programs[0]; |
| 2251 | for (i = 0; i < sizeof(nn->nfsd_versions); i++) |
| 2252 | nn->nfsd_versions[i] = nfsd_support_version(i); |
| 2253 | for (i = 0; i < sizeof(nn->nfsd4_minorversions); i++) |
| 2254 | nn->nfsd4_minorversions[i] = nfsd_support_version(4); |
| 2255 | nn->nfsd_info.mutex = &nfsd_mutex; |
| 2256 | nn->nfsd_serv = NULL; |
| 2257 | nfsd4_init_leases_net(nn); |
| 2258 | get_random_bytes(&nn->siphash_key, sizeof(nn->siphash_key)); |
| 2259 | seqlock_init(&nn->writeverf_lock); |
| 2260 | nfsd_proc_stat_init(net); |
| 2261 | #if IS_ENABLED(CONFIG_NFS_LOCALIO) |
| 2262 | INIT_LIST_HEAD(&nn->local_clients); |
| 2263 | #endif |
| 2264 | return 0; |
| 2265 | |
| 2266 | out_repcache_error: |
| 2267 | nfsd_idmap_shutdown(net); |
| 2268 | out_idmap_error: |
| 2269 | nfsd_export_shutdown(net); |
| 2270 | out_export_error: |
| 2271 | return retval; |
| 2272 | } |
| 2273 | |
| 2274 | #if IS_ENABLED(CONFIG_NFS_LOCALIO) |
| 2275 | /** |
| 2276 | * nfsd_net_pre_exit - Disconnect localio clients from net namespace |
| 2277 | * @net: a network namespace that is about to be destroyed |
| 2278 | * |
| 2279 | * This invalidated ->net pointers held by localio clients |
| 2280 | * while they can still safely access nn->counter. |
| 2281 | */ |
| 2282 | static __net_exit void nfsd_net_pre_exit(struct net *net) |
| 2283 | { |
| 2284 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 2285 | |
| 2286 | nfs_uuid_invalidate_clients(&nn->local_clients); |
| 2287 | } |
| 2288 | #endif |
| 2289 | |
| 2290 | /** |
| 2291 | * nfsd_net_exit - Release the nfsd_net portion of a net namespace |
| 2292 | * @net: a network namespace that is about to be destroyed |
| 2293 | * |
| 2294 | */ |
| 2295 | static __net_exit void nfsd_net_exit(struct net *net) |
| 2296 | { |
| 2297 | struct nfsd_net *nn = net_generic(net, nfsd_net_id); |
| 2298 | |
| 2299 | nfsd_proc_stat_shutdown(net); |
| 2300 | percpu_counter_destroy_many(nn->counter, NFSD_STATS_COUNTERS_NUM); |
| 2301 | nfsd_idmap_shutdown(net); |
| 2302 | nfsd_export_shutdown(net); |
| 2303 | } |
| 2304 | |
| 2305 | static struct pernet_operations nfsd_net_ops = { |
| 2306 | .init = nfsd_net_init, |
| 2307 | #if IS_ENABLED(CONFIG_NFS_LOCALIO) |
| 2308 | .pre_exit = nfsd_net_pre_exit, |
| 2309 | #endif |
| 2310 | .exit = nfsd_net_exit, |
| 2311 | .id = &nfsd_net_id, |
| 2312 | .size = sizeof(struct nfsd_net), |
| 2313 | }; |
| 2314 | |
| 2315 | static int __init init_nfsd(void) |
| 2316 | { |
| 2317 | int retval; |
| 2318 | |
| 2319 | retval = nfsd4_init_slabs(); |
| 2320 | if (retval) |
| 2321 | return retval; |
| 2322 | retval = nfsd4_init_pnfs(); |
| 2323 | if (retval) |
| 2324 | goto out_free_slabs; |
| 2325 | retval = nfsd_drc_slab_create(); |
| 2326 | if (retval) |
| 2327 | goto out_free_pnfs; |
| 2328 | nfsd_lockd_init(); /* lockd->nfsd callbacks */ |
| 2329 | retval = create_proc_exports_entry(); |
| 2330 | if (retval) |
| 2331 | goto out_free_lockd; |
| 2332 | retval = register_pernet_subsys(&nfsd_net_ops); |
| 2333 | if (retval < 0) |
| 2334 | goto out_free_exports; |
| 2335 | retval = register_cld_notifier(); |
| 2336 | if (retval) |
| 2337 | goto out_free_subsys; |
| 2338 | retval = nfsd4_create_laundry_wq(); |
| 2339 | if (retval) |
| 2340 | goto out_free_cld; |
| 2341 | retval = register_filesystem(&nfsd_fs_type); |
| 2342 | if (retval) |
| 2343 | goto out_free_all; |
| 2344 | retval = genl_register_family(&nfsd_nl_family); |
| 2345 | if (retval) |
| 2346 | goto out_free_all; |
| 2347 | nfsd_localio_ops_init(); |
| 2348 | |
| 2349 | return 0; |
| 2350 | out_free_all: |
| 2351 | nfsd4_destroy_laundry_wq(); |
| 2352 | out_free_cld: |
| 2353 | unregister_cld_notifier(); |
| 2354 | out_free_subsys: |
| 2355 | unregister_pernet_subsys(&nfsd_net_ops); |
| 2356 | out_free_exports: |
| 2357 | remove_proc_entry("fs/nfs/exports", NULL); |
| 2358 | remove_proc_entry("fs/nfs", NULL); |
| 2359 | out_free_lockd: |
| 2360 | nfsd_lockd_shutdown(); |
| 2361 | nfsd_drc_slab_free(); |
| 2362 | out_free_pnfs: |
| 2363 | nfsd4_exit_pnfs(); |
| 2364 | out_free_slabs: |
| 2365 | nfsd4_free_slabs(); |
| 2366 | return retval; |
| 2367 | } |
| 2368 | |
| 2369 | static void __exit exit_nfsd(void) |
| 2370 | { |
| 2371 | genl_unregister_family(&nfsd_nl_family); |
| 2372 | unregister_filesystem(&nfsd_fs_type); |
| 2373 | nfsd4_destroy_laundry_wq(); |
| 2374 | unregister_cld_notifier(); |
| 2375 | unregister_pernet_subsys(&nfsd_net_ops); |
| 2376 | nfsd_drc_slab_free(); |
| 2377 | remove_proc_entry("fs/nfs/exports", NULL); |
| 2378 | remove_proc_entry("fs/nfs", NULL); |
| 2379 | nfsd_lockd_shutdown(); |
| 2380 | nfsd4_free_slabs(); |
| 2381 | nfsd4_exit_pnfs(); |
| 2382 | } |
| 2383 | |
| 2384 | MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>"); |
| 2385 | MODULE_DESCRIPTION("In-kernel NFS server"); |
| 2386 | MODULE_LICENSE("GPL"); |
| 2387 | module_init(init_nfsd) |
| 2388 | module_exit(exit_nfsd) |