1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * linux/fs/nfs/fs_context.c 4 * 5 * Copyright (C) 1992 Rick Sladkey 6 * Conversion to new mount api Copyright (C) David Howells 7 * 8 * NFS mount handling. 9 * 10 * Split from fs/nfs/super.c by David Howells <dhowells@redhat.com> 11 */ 12 13 #include <linux/compat.h> 14 #include <linux/module.h> 15 #include <linux/fs.h> 16 #include <linux/fs_context.h> 17 #include <linux/fs_parser.h> 18 #include <linux/nfs_fs.h> 19 #include <linux/nfs_mount.h> 20 #include <linux/nfs4_mount.h> 21 #include "nfs.h" 22 #include "internal.h" 23 24 #define NFSDBG_FACILITY NFSDBG_MOUNT 25 26 #if IS_ENABLED(CONFIG_NFS_V3) 27 #define NFS_DEFAULT_VERSION 3 28 #else 29 #define NFS_DEFAULT_VERSION 2 30 #endif 31 32 #define NFS_MAX_CONNECTIONS 16 33 34 enum nfs_param { 35 Opt_ac, 36 Opt_acdirmax, 37 Opt_acdirmin, 38 Opt_acl, 39 Opt_acregmax, 40 Opt_acregmin, 41 Opt_actimeo, 42 Opt_addr, 43 Opt_bg, 44 Opt_bsize, 45 Opt_clientaddr, 46 Opt_cto, 47 Opt_fg, 48 Opt_fscache, 49 Opt_fscache_flag, 50 Opt_hard, 51 Opt_intr, 52 Opt_local_lock, 53 Opt_lock, 54 Opt_lookupcache, 55 Opt_migration, 56 Opt_minorversion, 57 Opt_mountaddr, 58 Opt_mounthost, 59 Opt_mountport, 60 Opt_mountproto, 61 Opt_mountvers, 62 Opt_namelen, 63 Opt_nconnect, 64 Opt_max_connect, 65 Opt_port, 66 Opt_posix, 67 Opt_proto, 68 Opt_rdirplus, 69 Opt_rdma, 70 Opt_resvport, 71 Opt_retrans, 72 Opt_retry, 73 Opt_rsize, 74 Opt_sec, 75 Opt_sharecache, 76 Opt_sloppy, 77 Opt_soft, 78 Opt_softerr, 79 Opt_softreval, 80 Opt_source, 81 Opt_tcp, 82 Opt_timeo, 83 Opt_udp, 84 Opt_v, 85 Opt_vers, 86 Opt_wsize, 87 Opt_write, 88 }; 89 90 enum { 91 Opt_local_lock_all, 92 Opt_local_lock_flock, 93 Opt_local_lock_none, 94 Opt_local_lock_posix, 95 }; 96 97 static const struct constant_table nfs_param_enums_local_lock[] = { 98 { "all", Opt_local_lock_all }, 99 { "flock", Opt_local_lock_flock }, 100 { "posix", Opt_local_lock_posix }, 101 { "none", Opt_local_lock_none }, 102 {} 103 }; 104 105 enum { 106 Opt_lookupcache_all, 107 Opt_lookupcache_none, 108 Opt_lookupcache_positive, 109 }; 110 111 static const struct constant_table nfs_param_enums_lookupcache[] = { 112 { "all", Opt_lookupcache_all }, 113 { "none", Opt_lookupcache_none }, 114 { "pos", Opt_lookupcache_positive }, 115 { "positive", Opt_lookupcache_positive }, 116 {} 117 }; 118 119 enum { 120 Opt_write_lazy, 121 Opt_write_eager, 122 Opt_write_wait, 123 }; 124 125 static const struct constant_table nfs_param_enums_write[] = { 126 { "lazy", Opt_write_lazy }, 127 { "eager", Opt_write_eager }, 128 { "wait", Opt_write_wait }, 129 {} 130 }; 131 132 static const struct fs_parameter_spec nfs_fs_parameters[] = { 133 fsparam_flag_no("ac", Opt_ac), 134 fsparam_u32 ("acdirmax", Opt_acdirmax), 135 fsparam_u32 ("acdirmin", Opt_acdirmin), 136 fsparam_flag_no("acl", Opt_acl), 137 fsparam_u32 ("acregmax", Opt_acregmax), 138 fsparam_u32 ("acregmin", Opt_acregmin), 139 fsparam_u32 ("actimeo", Opt_actimeo), 140 fsparam_string("addr", Opt_addr), 141 fsparam_flag ("bg", Opt_bg), 142 fsparam_u32 ("bsize", Opt_bsize), 143 fsparam_string("clientaddr", Opt_clientaddr), 144 fsparam_flag_no("cto", Opt_cto), 145 fsparam_flag ("fg", Opt_fg), 146 fsparam_flag_no("fsc", Opt_fscache_flag), 147 fsparam_string("fsc", Opt_fscache), 148 fsparam_flag ("hard", Opt_hard), 149 __fsparam(NULL, "intr", Opt_intr, 150 fs_param_neg_with_no|fs_param_deprecated, NULL), 151 fsparam_enum ("local_lock", Opt_local_lock, nfs_param_enums_local_lock), 152 fsparam_flag_no("lock", Opt_lock), 153 fsparam_enum ("lookupcache", Opt_lookupcache, nfs_param_enums_lookupcache), 154 fsparam_flag_no("migration", Opt_migration), 155 fsparam_u32 ("minorversion", Opt_minorversion), 156 fsparam_string("mountaddr", Opt_mountaddr), 157 fsparam_string("mounthost", Opt_mounthost), 158 fsparam_u32 ("mountport", Opt_mountport), 159 fsparam_string("mountproto", Opt_mountproto), 160 fsparam_u32 ("mountvers", Opt_mountvers), 161 fsparam_u32 ("namlen", Opt_namelen), 162 fsparam_u32 ("nconnect", Opt_nconnect), 163 fsparam_u32 ("max_connect", Opt_max_connect), 164 fsparam_string("nfsvers", Opt_vers), 165 fsparam_u32 ("port", Opt_port), 166 fsparam_flag_no("posix", Opt_posix), 167 fsparam_string("proto", Opt_proto), 168 fsparam_flag_no("rdirplus", Opt_rdirplus), 169 fsparam_flag ("rdma", Opt_rdma), 170 fsparam_flag_no("resvport", Opt_resvport), 171 fsparam_u32 ("retrans", Opt_retrans), 172 fsparam_string("retry", Opt_retry), 173 fsparam_u32 ("rsize", Opt_rsize), 174 fsparam_string("sec", Opt_sec), 175 fsparam_flag_no("sharecache", Opt_sharecache), 176 fsparam_flag ("sloppy", Opt_sloppy), 177 fsparam_flag ("soft", Opt_soft), 178 fsparam_flag ("softerr", Opt_softerr), 179 fsparam_flag ("softreval", Opt_softreval), 180 fsparam_string("source", Opt_source), 181 fsparam_flag ("tcp", Opt_tcp), 182 fsparam_u32 ("timeo", Opt_timeo), 183 fsparam_flag ("udp", Opt_udp), 184 fsparam_flag ("v2", Opt_v), 185 fsparam_flag ("v3", Opt_v), 186 fsparam_flag ("v4", Opt_v), 187 fsparam_flag ("v4.0", Opt_v), 188 fsparam_flag ("v4.1", Opt_v), 189 fsparam_flag ("v4.2", Opt_v), 190 fsparam_string("vers", Opt_vers), 191 fsparam_enum ("write", Opt_write, nfs_param_enums_write), 192 fsparam_u32 ("wsize", Opt_wsize), 193 {} 194 }; 195 196 enum { 197 Opt_vers_2, 198 Opt_vers_3, 199 Opt_vers_4, 200 Opt_vers_4_0, 201 Opt_vers_4_1, 202 Opt_vers_4_2, 203 }; 204 205 static const struct constant_table nfs_vers_tokens[] = { 206 { "2", Opt_vers_2 }, 207 { "3", Opt_vers_3 }, 208 { "4", Opt_vers_4 }, 209 { "4.0", Opt_vers_4_0 }, 210 { "4.1", Opt_vers_4_1 }, 211 { "4.2", Opt_vers_4_2 }, 212 {} 213 }; 214 215 enum { 216 Opt_xprt_rdma, 217 Opt_xprt_rdma6, 218 Opt_xprt_tcp, 219 Opt_xprt_tcp6, 220 Opt_xprt_udp, 221 Opt_xprt_udp6, 222 nr__Opt_xprt 223 }; 224 225 static const struct constant_table nfs_xprt_protocol_tokens[] = { 226 { "rdma", Opt_xprt_rdma }, 227 { "rdma6", Opt_xprt_rdma6 }, 228 { "tcp", Opt_xprt_tcp }, 229 { "tcp6", Opt_xprt_tcp6 }, 230 { "udp", Opt_xprt_udp }, 231 { "udp6", Opt_xprt_udp6 }, 232 {} 233 }; 234 235 enum { 236 Opt_sec_krb5, 237 Opt_sec_krb5i, 238 Opt_sec_krb5p, 239 Opt_sec_lkey, 240 Opt_sec_lkeyi, 241 Opt_sec_lkeyp, 242 Opt_sec_none, 243 Opt_sec_spkm, 244 Opt_sec_spkmi, 245 Opt_sec_spkmp, 246 Opt_sec_sys, 247 nr__Opt_sec 248 }; 249 250 static const struct constant_table nfs_secflavor_tokens[] = { 251 { "krb5", Opt_sec_krb5 }, 252 { "krb5i", Opt_sec_krb5i }, 253 { "krb5p", Opt_sec_krb5p }, 254 { "lkey", Opt_sec_lkey }, 255 { "lkeyi", Opt_sec_lkeyi }, 256 { "lkeyp", Opt_sec_lkeyp }, 257 { "none", Opt_sec_none }, 258 { "null", Opt_sec_none }, 259 { "spkm3", Opt_sec_spkm }, 260 { "spkm3i", Opt_sec_spkmi }, 261 { "spkm3p", Opt_sec_spkmp }, 262 { "sys", Opt_sec_sys }, 263 {} 264 }; 265 266 /* 267 * Sanity-check a server address provided by the mount command. 268 * 269 * Address family must be initialized, and address must not be 270 * the ANY address for that family. 271 */ 272 static int nfs_verify_server_address(struct sockaddr *addr) 273 { 274 switch (addr->sa_family) { 275 case AF_INET: { 276 struct sockaddr_in *sa = (struct sockaddr_in *)addr; 277 return sa->sin_addr.s_addr != htonl(INADDR_ANY); 278 } 279 case AF_INET6: { 280 struct in6_addr *sa = &((struct sockaddr_in6 *)addr)->sin6_addr; 281 return !ipv6_addr_any(sa); 282 } 283 } 284 285 dfprintk(MOUNT, "NFS: Invalid IP address specified\n"); 286 return 0; 287 } 288 289 #ifdef CONFIG_NFS_DISABLE_UDP_SUPPORT 290 static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx) 291 { 292 return true; 293 } 294 #else 295 static bool nfs_server_transport_udp_invalid(const struct nfs_fs_context *ctx) 296 { 297 if (ctx->version == 4) 298 return true; 299 return false; 300 } 301 #endif 302 303 /* 304 * Sanity check the NFS transport protocol. 305 */ 306 static int nfs_validate_transport_protocol(struct fs_context *fc, 307 struct nfs_fs_context *ctx) 308 { 309 switch (ctx->nfs_server.protocol) { 310 case XPRT_TRANSPORT_UDP: 311 if (nfs_server_transport_udp_invalid(ctx)) 312 goto out_invalid_transport_udp; 313 break; 314 case XPRT_TRANSPORT_TCP: 315 case XPRT_TRANSPORT_RDMA: 316 break; 317 default: 318 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP; 319 } 320 return 0; 321 out_invalid_transport_udp: 322 return nfs_invalf(fc, "NFS: Unsupported transport protocol udp"); 323 } 324 325 /* 326 * For text based NFSv2/v3 mounts, the mount protocol transport default 327 * settings should depend upon the specified NFS transport. 328 */ 329 static void nfs_set_mount_transport_protocol(struct nfs_fs_context *ctx) 330 { 331 if (ctx->mount_server.protocol == XPRT_TRANSPORT_UDP || 332 ctx->mount_server.protocol == XPRT_TRANSPORT_TCP) 333 return; 334 switch (ctx->nfs_server.protocol) { 335 case XPRT_TRANSPORT_UDP: 336 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP; 337 break; 338 case XPRT_TRANSPORT_TCP: 339 case XPRT_TRANSPORT_RDMA: 340 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP; 341 } 342 } 343 344 /* 345 * Add 'flavor' to 'auth_info' if not already present. 346 * Returns true if 'flavor' ends up in the list, false otherwise 347 */ 348 static int nfs_auth_info_add(struct fs_context *fc, 349 struct nfs_auth_info *auth_info, 350 rpc_authflavor_t flavor) 351 { 352 unsigned int i; 353 unsigned int max_flavor_len = ARRAY_SIZE(auth_info->flavors); 354 355 /* make sure this flavor isn't already in the list */ 356 for (i = 0; i < auth_info->flavor_len; i++) { 357 if (flavor == auth_info->flavors[i]) 358 return 0; 359 } 360 361 if (auth_info->flavor_len + 1 >= max_flavor_len) 362 return nfs_invalf(fc, "NFS: too many sec= flavors"); 363 364 auth_info->flavors[auth_info->flavor_len++] = flavor; 365 return 0; 366 } 367 368 /* 369 * Parse the value of the 'sec=' option. 370 */ 371 static int nfs_parse_security_flavors(struct fs_context *fc, 372 struct fs_parameter *param) 373 { 374 struct nfs_fs_context *ctx = nfs_fc2context(fc); 375 rpc_authflavor_t pseudoflavor; 376 char *string = param->string, *p; 377 int ret; 378 379 dfprintk(MOUNT, "NFS: parsing %s=%s option\n", param->key, param->string); 380 381 while ((p = strsep(&string, ":")) != NULL) { 382 if (!*p) 383 continue; 384 switch (lookup_constant(nfs_secflavor_tokens, p, -1)) { 385 case Opt_sec_none: 386 pseudoflavor = RPC_AUTH_NULL; 387 break; 388 case Opt_sec_sys: 389 pseudoflavor = RPC_AUTH_UNIX; 390 break; 391 case Opt_sec_krb5: 392 pseudoflavor = RPC_AUTH_GSS_KRB5; 393 break; 394 case Opt_sec_krb5i: 395 pseudoflavor = RPC_AUTH_GSS_KRB5I; 396 break; 397 case Opt_sec_krb5p: 398 pseudoflavor = RPC_AUTH_GSS_KRB5P; 399 break; 400 case Opt_sec_lkey: 401 pseudoflavor = RPC_AUTH_GSS_LKEY; 402 break; 403 case Opt_sec_lkeyi: 404 pseudoflavor = RPC_AUTH_GSS_LKEYI; 405 break; 406 case Opt_sec_lkeyp: 407 pseudoflavor = RPC_AUTH_GSS_LKEYP; 408 break; 409 case Opt_sec_spkm: 410 pseudoflavor = RPC_AUTH_GSS_SPKM; 411 break; 412 case Opt_sec_spkmi: 413 pseudoflavor = RPC_AUTH_GSS_SPKMI; 414 break; 415 case Opt_sec_spkmp: 416 pseudoflavor = RPC_AUTH_GSS_SPKMP; 417 break; 418 default: 419 return nfs_invalf(fc, "NFS: sec=%s option not recognized", p); 420 } 421 422 ret = nfs_auth_info_add(fc, &ctx->auth_info, pseudoflavor); 423 if (ret < 0) 424 return ret; 425 } 426 427 return 0; 428 } 429 430 static int nfs_parse_version_string(struct fs_context *fc, 431 const char *string) 432 { 433 struct nfs_fs_context *ctx = nfs_fc2context(fc); 434 435 ctx->flags &= ~NFS_MOUNT_VER3; 436 switch (lookup_constant(nfs_vers_tokens, string, -1)) { 437 case Opt_vers_2: 438 ctx->version = 2; 439 break; 440 case Opt_vers_3: 441 ctx->flags |= NFS_MOUNT_VER3; 442 ctx->version = 3; 443 break; 444 case Opt_vers_4: 445 /* Backward compatibility option. In future, 446 * the mount program should always supply 447 * a NFSv4 minor version number. 448 */ 449 ctx->version = 4; 450 break; 451 case Opt_vers_4_0: 452 ctx->version = 4; 453 ctx->minorversion = 0; 454 break; 455 case Opt_vers_4_1: 456 ctx->version = 4; 457 ctx->minorversion = 1; 458 break; 459 case Opt_vers_4_2: 460 ctx->version = 4; 461 ctx->minorversion = 2; 462 break; 463 default: 464 return nfs_invalf(fc, "NFS: Unsupported NFS version"); 465 } 466 return 0; 467 } 468 469 /* 470 * Parse a single mount parameter. 471 */ 472 static int nfs_fs_context_parse_param(struct fs_context *fc, 473 struct fs_parameter *param) 474 { 475 struct fs_parse_result result; 476 struct nfs_fs_context *ctx = nfs_fc2context(fc); 477 unsigned short protofamily, mountfamily; 478 unsigned int len; 479 int ret, opt; 480 481 dfprintk(MOUNT, "NFS: parsing nfs mount option '%s'\n", param->key); 482 483 opt = fs_parse(fc, nfs_fs_parameters, param, &result); 484 if (opt < 0) 485 return ctx->sloppy ? 1 : opt; 486 487 if (fc->security) 488 ctx->has_sec_mnt_opts = 1; 489 490 switch (opt) { 491 case Opt_source: 492 if (fc->source) 493 return nfs_invalf(fc, "NFS: Multiple sources not supported"); 494 fc->source = param->string; 495 param->string = NULL; 496 break; 497 498 /* 499 * boolean options: foo/nofoo 500 */ 501 case Opt_soft: 502 ctx->flags |= NFS_MOUNT_SOFT; 503 ctx->flags &= ~NFS_MOUNT_SOFTERR; 504 break; 505 case Opt_softerr: 506 ctx->flags |= NFS_MOUNT_SOFTERR | NFS_MOUNT_SOFTREVAL; 507 ctx->flags &= ~NFS_MOUNT_SOFT; 508 break; 509 case Opt_hard: 510 ctx->flags &= ~(NFS_MOUNT_SOFT | 511 NFS_MOUNT_SOFTERR | 512 NFS_MOUNT_SOFTREVAL); 513 break; 514 case Opt_softreval: 515 if (result.negated) 516 ctx->flags &= ~NFS_MOUNT_SOFTREVAL; 517 else 518 ctx->flags &= NFS_MOUNT_SOFTREVAL; 519 break; 520 case Opt_posix: 521 if (result.negated) 522 ctx->flags &= ~NFS_MOUNT_POSIX; 523 else 524 ctx->flags |= NFS_MOUNT_POSIX; 525 break; 526 case Opt_cto: 527 if (result.negated) 528 ctx->flags |= NFS_MOUNT_NOCTO; 529 else 530 ctx->flags &= ~NFS_MOUNT_NOCTO; 531 break; 532 case Opt_ac: 533 if (result.negated) 534 ctx->flags |= NFS_MOUNT_NOAC; 535 else 536 ctx->flags &= ~NFS_MOUNT_NOAC; 537 break; 538 case Opt_lock: 539 if (result.negated) { 540 ctx->flags |= NFS_MOUNT_NONLM; 541 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); 542 } else { 543 ctx->flags &= ~NFS_MOUNT_NONLM; 544 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | NFS_MOUNT_LOCAL_FCNTL); 545 } 546 break; 547 case Opt_udp: 548 ctx->flags &= ~NFS_MOUNT_TCP; 549 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP; 550 break; 551 case Opt_tcp: 552 case Opt_rdma: 553 ctx->flags |= NFS_MOUNT_TCP; /* for side protocols */ 554 ret = xprt_find_transport_ident(param->key); 555 if (ret < 0) 556 goto out_bad_transport; 557 ctx->nfs_server.protocol = ret; 558 break; 559 case Opt_acl: 560 if (result.negated) 561 ctx->flags |= NFS_MOUNT_NOACL; 562 else 563 ctx->flags &= ~NFS_MOUNT_NOACL; 564 break; 565 case Opt_rdirplus: 566 if (result.negated) 567 ctx->flags |= NFS_MOUNT_NORDIRPLUS; 568 else 569 ctx->flags &= ~NFS_MOUNT_NORDIRPLUS; 570 break; 571 case Opt_sharecache: 572 if (result.negated) 573 ctx->flags |= NFS_MOUNT_UNSHARED; 574 else 575 ctx->flags &= ~NFS_MOUNT_UNSHARED; 576 break; 577 case Opt_resvport: 578 if (result.negated) 579 ctx->flags |= NFS_MOUNT_NORESVPORT; 580 else 581 ctx->flags &= ~NFS_MOUNT_NORESVPORT; 582 break; 583 case Opt_fscache_flag: 584 if (result.negated) 585 ctx->options &= ~NFS_OPTION_FSCACHE; 586 else 587 ctx->options |= NFS_OPTION_FSCACHE; 588 kfree(ctx->fscache_uniq); 589 ctx->fscache_uniq = NULL; 590 break; 591 case Opt_fscache: 592 ctx->options |= NFS_OPTION_FSCACHE; 593 kfree(ctx->fscache_uniq); 594 ctx->fscache_uniq = param->string; 595 param->string = NULL; 596 break; 597 case Opt_migration: 598 if (result.negated) 599 ctx->options &= ~NFS_OPTION_MIGRATION; 600 else 601 ctx->options |= NFS_OPTION_MIGRATION; 602 break; 603 604 /* 605 * options that take numeric values 606 */ 607 case Opt_port: 608 if (result.uint_32 > USHRT_MAX) 609 goto out_of_bounds; 610 ctx->nfs_server.port = result.uint_32; 611 break; 612 case Opt_rsize: 613 ctx->rsize = result.uint_32; 614 break; 615 case Opt_wsize: 616 ctx->wsize = result.uint_32; 617 break; 618 case Opt_bsize: 619 ctx->bsize = result.uint_32; 620 break; 621 case Opt_timeo: 622 if (result.uint_32 < 1 || result.uint_32 > INT_MAX) 623 goto out_of_bounds; 624 ctx->timeo = result.uint_32; 625 break; 626 case Opt_retrans: 627 if (result.uint_32 > INT_MAX) 628 goto out_of_bounds; 629 ctx->retrans = result.uint_32; 630 break; 631 case Opt_acregmin: 632 ctx->acregmin = result.uint_32; 633 break; 634 case Opt_acregmax: 635 ctx->acregmax = result.uint_32; 636 break; 637 case Opt_acdirmin: 638 ctx->acdirmin = result.uint_32; 639 break; 640 case Opt_acdirmax: 641 ctx->acdirmax = result.uint_32; 642 break; 643 case Opt_actimeo: 644 ctx->acregmin = result.uint_32; 645 ctx->acregmax = result.uint_32; 646 ctx->acdirmin = result.uint_32; 647 ctx->acdirmax = result.uint_32; 648 break; 649 case Opt_namelen: 650 ctx->namlen = result.uint_32; 651 break; 652 case Opt_mountport: 653 if (result.uint_32 > USHRT_MAX) 654 goto out_of_bounds; 655 ctx->mount_server.port = result.uint_32; 656 break; 657 case Opt_mountvers: 658 if (result.uint_32 < NFS_MNT_VERSION || 659 result.uint_32 > NFS_MNT3_VERSION) 660 goto out_of_bounds; 661 ctx->mount_server.version = result.uint_32; 662 break; 663 case Opt_minorversion: 664 if (result.uint_32 > NFS4_MAX_MINOR_VERSION) 665 goto out_of_bounds; 666 ctx->minorversion = result.uint_32; 667 break; 668 669 /* 670 * options that take text values 671 */ 672 case Opt_v: 673 ret = nfs_parse_version_string(fc, param->key + 1); 674 if (ret < 0) 675 return ret; 676 break; 677 case Opt_vers: 678 ret = nfs_parse_version_string(fc, param->string); 679 if (ret < 0) 680 return ret; 681 break; 682 case Opt_sec: 683 ret = nfs_parse_security_flavors(fc, param); 684 if (ret < 0) 685 return ret; 686 break; 687 688 case Opt_proto: 689 protofamily = AF_INET; 690 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) { 691 case Opt_xprt_udp6: 692 protofamily = AF_INET6; 693 fallthrough; 694 case Opt_xprt_udp: 695 ctx->flags &= ~NFS_MOUNT_TCP; 696 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP; 697 break; 698 case Opt_xprt_tcp6: 699 protofamily = AF_INET6; 700 fallthrough; 701 case Opt_xprt_tcp: 702 ctx->flags |= NFS_MOUNT_TCP; 703 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP; 704 break; 705 case Opt_xprt_rdma6: 706 protofamily = AF_INET6; 707 fallthrough; 708 case Opt_xprt_rdma: 709 /* vector side protocols to TCP */ 710 ctx->flags |= NFS_MOUNT_TCP; 711 ret = xprt_find_transport_ident(param->string); 712 if (ret < 0) 713 goto out_bad_transport; 714 ctx->nfs_server.protocol = ret; 715 break; 716 default: 717 goto out_bad_transport; 718 } 719 720 ctx->protofamily = protofamily; 721 break; 722 723 case Opt_mountproto: 724 mountfamily = AF_INET; 725 switch (lookup_constant(nfs_xprt_protocol_tokens, param->string, -1)) { 726 case Opt_xprt_udp6: 727 mountfamily = AF_INET6; 728 fallthrough; 729 case Opt_xprt_udp: 730 ctx->mount_server.protocol = XPRT_TRANSPORT_UDP; 731 break; 732 case Opt_xprt_tcp6: 733 mountfamily = AF_INET6; 734 fallthrough; 735 case Opt_xprt_tcp: 736 ctx->mount_server.protocol = XPRT_TRANSPORT_TCP; 737 break; 738 case Opt_xprt_rdma: /* not used for side protocols */ 739 default: 740 goto out_bad_transport; 741 } 742 ctx->mountfamily = mountfamily; 743 break; 744 745 case Opt_addr: 746 len = rpc_pton(fc->net_ns, param->string, param->size, 747 &ctx->nfs_server.address, 748 sizeof(ctx->nfs_server._address)); 749 if (len == 0) 750 goto out_invalid_address; 751 ctx->nfs_server.addrlen = len; 752 break; 753 case Opt_clientaddr: 754 kfree(ctx->client_address); 755 ctx->client_address = param->string; 756 param->string = NULL; 757 break; 758 case Opt_mounthost: 759 kfree(ctx->mount_server.hostname); 760 ctx->mount_server.hostname = param->string; 761 param->string = NULL; 762 break; 763 case Opt_mountaddr: 764 len = rpc_pton(fc->net_ns, param->string, param->size, 765 &ctx->mount_server.address, 766 sizeof(ctx->mount_server._address)); 767 if (len == 0) 768 goto out_invalid_address; 769 ctx->mount_server.addrlen = len; 770 break; 771 case Opt_nconnect: 772 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_CONNECTIONS) 773 goto out_of_bounds; 774 ctx->nfs_server.nconnect = result.uint_32; 775 break; 776 case Opt_max_connect: 777 if (result.uint_32 < 1 || result.uint_32 > NFS_MAX_TRANSPORTS) 778 goto out_of_bounds; 779 ctx->nfs_server.max_connect = result.uint_32; 780 break; 781 case Opt_lookupcache: 782 switch (result.uint_32) { 783 case Opt_lookupcache_all: 784 ctx->flags &= ~(NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE); 785 break; 786 case Opt_lookupcache_positive: 787 ctx->flags &= ~NFS_MOUNT_LOOKUP_CACHE_NONE; 788 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG; 789 break; 790 case Opt_lookupcache_none: 791 ctx->flags |= NFS_MOUNT_LOOKUP_CACHE_NONEG|NFS_MOUNT_LOOKUP_CACHE_NONE; 792 break; 793 default: 794 goto out_invalid_value; 795 } 796 break; 797 case Opt_local_lock: 798 switch (result.uint_32) { 799 case Opt_local_lock_all: 800 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK | 801 NFS_MOUNT_LOCAL_FCNTL); 802 break; 803 case Opt_local_lock_flock: 804 ctx->flags |= NFS_MOUNT_LOCAL_FLOCK; 805 break; 806 case Opt_local_lock_posix: 807 ctx->flags |= NFS_MOUNT_LOCAL_FCNTL; 808 break; 809 case Opt_local_lock_none: 810 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK | 811 NFS_MOUNT_LOCAL_FCNTL); 812 break; 813 default: 814 goto out_invalid_value; 815 } 816 break; 817 case Opt_write: 818 switch (result.uint_32) { 819 case Opt_write_lazy: 820 ctx->flags &= 821 ~(NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT); 822 break; 823 case Opt_write_eager: 824 ctx->flags |= NFS_MOUNT_WRITE_EAGER; 825 ctx->flags &= ~NFS_MOUNT_WRITE_WAIT; 826 break; 827 case Opt_write_wait: 828 ctx->flags |= 829 NFS_MOUNT_WRITE_EAGER | NFS_MOUNT_WRITE_WAIT; 830 break; 831 default: 832 goto out_invalid_value; 833 } 834 break; 835 836 /* 837 * Special options 838 */ 839 case Opt_sloppy: 840 ctx->sloppy = true; 841 dfprintk(MOUNT, "NFS: relaxing parsing rules\n"); 842 break; 843 } 844 845 return 0; 846 847 out_invalid_value: 848 return nfs_invalf(fc, "NFS: Bad mount option value specified"); 849 out_invalid_address: 850 return nfs_invalf(fc, "NFS: Bad IP address specified"); 851 out_of_bounds: 852 return nfs_invalf(fc, "NFS: Value for '%s' out of range", param->key); 853 out_bad_transport: 854 return nfs_invalf(fc, "NFS: Unrecognized transport protocol"); 855 } 856 857 /* 858 * Split fc->source into "hostname:export_path". 859 * 860 * The leftmost colon demarks the split between the server's hostname 861 * and the export path. If the hostname starts with a left square 862 * bracket, then it may contain colons. 863 * 864 * Note: caller frees hostname and export path, even on error. 865 */ 866 static int nfs_parse_source(struct fs_context *fc, 867 size_t maxnamlen, size_t maxpathlen) 868 { 869 struct nfs_fs_context *ctx = nfs_fc2context(fc); 870 const char *dev_name = fc->source; 871 size_t len; 872 const char *end; 873 874 if (unlikely(!dev_name || !*dev_name)) { 875 dfprintk(MOUNT, "NFS: device name not specified\n"); 876 return -EINVAL; 877 } 878 879 /* Is the host name protected with square brakcets? */ 880 if (*dev_name == '[') { 881 end = strchr(++dev_name, ']'); 882 if (end == NULL || end[1] != ':') 883 goto out_bad_devname; 884 885 len = end - dev_name; 886 end++; 887 } else { 888 const char *comma; 889 890 end = strchr(dev_name, ':'); 891 if (end == NULL) 892 goto out_bad_devname; 893 len = end - dev_name; 894 895 /* kill possible hostname list: not supported */ 896 comma = memchr(dev_name, ',', len); 897 if (comma) 898 len = comma - dev_name; 899 } 900 901 if (len > maxnamlen) 902 goto out_hostname; 903 904 kfree(ctx->nfs_server.hostname); 905 906 /* N.B. caller will free nfs_server.hostname in all cases */ 907 ctx->nfs_server.hostname = kmemdup_nul(dev_name, len, GFP_KERNEL); 908 if (!ctx->nfs_server.hostname) 909 goto out_nomem; 910 len = strlen(++end); 911 if (len > maxpathlen) 912 goto out_path; 913 ctx->nfs_server.export_path = kmemdup_nul(end, len, GFP_KERNEL); 914 if (!ctx->nfs_server.export_path) 915 goto out_nomem; 916 917 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", ctx->nfs_server.export_path); 918 return 0; 919 920 out_bad_devname: 921 return nfs_invalf(fc, "NFS: device name not in host:path format"); 922 out_nomem: 923 nfs_errorf(fc, "NFS: not enough memory to parse device name"); 924 return -ENOMEM; 925 out_hostname: 926 nfs_errorf(fc, "NFS: server hostname too long"); 927 return -ENAMETOOLONG; 928 out_path: 929 nfs_errorf(fc, "NFS: export pathname too long"); 930 return -ENAMETOOLONG; 931 } 932 933 static inline bool is_remount_fc(struct fs_context *fc) 934 { 935 return fc->root != NULL; 936 } 937 938 /* 939 * Parse monolithic NFS2/NFS3 mount data 940 * - fills in the mount root filehandle 941 * 942 * For option strings, user space handles the following behaviors: 943 * 944 * + DNS: mapping server host name to IP address ("addr=" option) 945 * 946 * + failure mode: how to behave if a mount request can't be handled 947 * immediately ("fg/bg" option) 948 * 949 * + retry: how often to retry a mount request ("retry=" option) 950 * 951 * + breaking back: trying proto=udp after proto=tcp, v2 after v3, 952 * mountproto=tcp after mountproto=udp, and so on 953 */ 954 static int nfs23_parse_monolithic(struct fs_context *fc, 955 struct nfs_mount_data *data) 956 { 957 struct nfs_fs_context *ctx = nfs_fc2context(fc); 958 struct nfs_fh *mntfh = ctx->mntfh; 959 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address; 960 int extra_flags = NFS_MOUNT_LEGACY_INTERFACE; 961 int ret; 962 963 if (data == NULL) 964 goto out_no_data; 965 966 ctx->version = NFS_DEFAULT_VERSION; 967 switch (data->version) { 968 case 1: 969 data->namlen = 0; 970 fallthrough; 971 case 2: 972 data->bsize = 0; 973 fallthrough; 974 case 3: 975 if (data->flags & NFS_MOUNT_VER3) 976 goto out_no_v3; 977 data->root.size = NFS2_FHSIZE; 978 memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE); 979 /* Turn off security negotiation */ 980 extra_flags |= NFS_MOUNT_SECFLAVOUR; 981 fallthrough; 982 case 4: 983 if (data->flags & NFS_MOUNT_SECFLAVOUR) 984 goto out_no_sec; 985 fallthrough; 986 case 5: 987 memset(data->context, 0, sizeof(data->context)); 988 fallthrough; 989 case 6: 990 if (data->flags & NFS_MOUNT_VER3) { 991 if (data->root.size > NFS3_FHSIZE || data->root.size == 0) 992 goto out_invalid_fh; 993 mntfh->size = data->root.size; 994 ctx->version = 3; 995 } else { 996 mntfh->size = NFS2_FHSIZE; 997 ctx->version = 2; 998 } 999 1000 1001 memcpy(mntfh->data, data->root.data, mntfh->size); 1002 if (mntfh->size < sizeof(mntfh->data)) 1003 memset(mntfh->data + mntfh->size, 0, 1004 sizeof(mntfh->data) - mntfh->size); 1005 1006 /* 1007 * for proto == XPRT_TRANSPORT_UDP, which is what uses 1008 * to_exponential, implying shift: limit the shift value 1009 * to BITS_PER_LONG (majortimeo is unsigned long) 1010 */ 1011 if (!(data->flags & NFS_MOUNT_TCP)) /* this will be UDP */ 1012 if (data->retrans >= 64) /* shift value is too large */ 1013 goto out_invalid_data; 1014 1015 /* 1016 * Translate to nfs_fs_context, which nfs_fill_super 1017 * can deal with. 1018 */ 1019 ctx->flags = data->flags & NFS_MOUNT_FLAGMASK; 1020 ctx->flags |= extra_flags; 1021 ctx->rsize = data->rsize; 1022 ctx->wsize = data->wsize; 1023 ctx->timeo = data->timeo; 1024 ctx->retrans = data->retrans; 1025 ctx->acregmin = data->acregmin; 1026 ctx->acregmax = data->acregmax; 1027 ctx->acdirmin = data->acdirmin; 1028 ctx->acdirmax = data->acdirmax; 1029 ctx->need_mount = false; 1030 1031 memcpy(sap, &data->addr, sizeof(data->addr)); 1032 ctx->nfs_server.addrlen = sizeof(data->addr); 1033 ctx->nfs_server.port = ntohs(data->addr.sin_port); 1034 if (sap->sa_family != AF_INET || 1035 !nfs_verify_server_address(sap)) 1036 goto out_no_address; 1037 1038 if (!(data->flags & NFS_MOUNT_TCP)) 1039 ctx->nfs_server.protocol = XPRT_TRANSPORT_UDP; 1040 /* N.B. caller will free nfs_server.hostname in all cases */ 1041 ctx->nfs_server.hostname = kstrdup(data->hostname, GFP_KERNEL); 1042 if (!ctx->nfs_server.hostname) 1043 goto out_nomem; 1044 1045 ctx->namlen = data->namlen; 1046 ctx->bsize = data->bsize; 1047 1048 if (data->flags & NFS_MOUNT_SECFLAVOUR) 1049 ctx->selected_flavor = data->pseudoflavor; 1050 else 1051 ctx->selected_flavor = RPC_AUTH_UNIX; 1052 1053 if (!(data->flags & NFS_MOUNT_NONLM)) 1054 ctx->flags &= ~(NFS_MOUNT_LOCAL_FLOCK| 1055 NFS_MOUNT_LOCAL_FCNTL); 1056 else 1057 ctx->flags |= (NFS_MOUNT_LOCAL_FLOCK| 1058 NFS_MOUNT_LOCAL_FCNTL); 1059 1060 /* 1061 * The legacy version 6 binary mount data from userspace has a 1062 * field used only to transport selinux information into the 1063 * kernel. To continue to support that functionality we 1064 * have a touch of selinux knowledge here in the NFS code. The 1065 * userspace code converted context=blah to just blah so we are 1066 * converting back to the full string selinux understands. 1067 */ 1068 if (data->context[0]){ 1069 #ifdef CONFIG_SECURITY_SELINUX 1070 int ret; 1071 1072 data->context[NFS_MAX_CONTEXT_LEN] = '\0'; 1073 ret = vfs_parse_fs_string(fc, "context", 1074 data->context, strlen(data->context)); 1075 if (ret < 0) 1076 return ret; 1077 #else 1078 return -EINVAL; 1079 #endif 1080 } 1081 1082 break; 1083 default: 1084 goto generic; 1085 } 1086 1087 ret = nfs_validate_transport_protocol(fc, ctx); 1088 if (ret) 1089 return ret; 1090 1091 ctx->skip_reconfig_option_check = true; 1092 return 0; 1093 1094 generic: 1095 return generic_parse_monolithic(fc, data); 1096 1097 out_no_data: 1098 if (is_remount_fc(fc)) { 1099 ctx->skip_reconfig_option_check = true; 1100 return 0; 1101 } 1102 return nfs_invalf(fc, "NFS: mount program didn't pass any mount data"); 1103 1104 out_no_v3: 1105 return nfs_invalf(fc, "NFS: nfs_mount_data version does not support v3"); 1106 1107 out_no_sec: 1108 return nfs_invalf(fc, "NFS: nfs_mount_data version supports only AUTH_SYS"); 1109 1110 out_nomem: 1111 dfprintk(MOUNT, "NFS: not enough memory to handle mount options"); 1112 return -ENOMEM; 1113 1114 out_no_address: 1115 return nfs_invalf(fc, "NFS: mount program didn't pass remote address"); 1116 1117 out_invalid_fh: 1118 return nfs_invalf(fc, "NFS: invalid root filehandle"); 1119 1120 out_invalid_data: 1121 return nfs_invalf(fc, "NFS: invalid binary mount data"); 1122 } 1123 1124 #if IS_ENABLED(CONFIG_NFS_V4) 1125 struct compat_nfs_string { 1126 compat_uint_t len; 1127 compat_uptr_t data; 1128 }; 1129 1130 static inline void compat_nfs_string(struct nfs_string *dst, 1131 struct compat_nfs_string *src) 1132 { 1133 dst->data = compat_ptr(src->data); 1134 dst->len = src->len; 1135 } 1136 1137 struct compat_nfs4_mount_data_v1 { 1138 compat_int_t version; 1139 compat_int_t flags; 1140 compat_int_t rsize; 1141 compat_int_t wsize; 1142 compat_int_t timeo; 1143 compat_int_t retrans; 1144 compat_int_t acregmin; 1145 compat_int_t acregmax; 1146 compat_int_t acdirmin; 1147 compat_int_t acdirmax; 1148 struct compat_nfs_string client_addr; 1149 struct compat_nfs_string mnt_path; 1150 struct compat_nfs_string hostname; 1151 compat_uint_t host_addrlen; 1152 compat_uptr_t host_addr; 1153 compat_int_t proto; 1154 compat_int_t auth_flavourlen; 1155 compat_uptr_t auth_flavours; 1156 }; 1157 1158 static void nfs4_compat_mount_data_conv(struct nfs4_mount_data *data) 1159 { 1160 struct compat_nfs4_mount_data_v1 *compat = 1161 (struct compat_nfs4_mount_data_v1 *)data; 1162 1163 /* copy the fields backwards */ 1164 data->auth_flavours = compat_ptr(compat->auth_flavours); 1165 data->auth_flavourlen = compat->auth_flavourlen; 1166 data->proto = compat->proto; 1167 data->host_addr = compat_ptr(compat->host_addr); 1168 data->host_addrlen = compat->host_addrlen; 1169 compat_nfs_string(&data->hostname, &compat->hostname); 1170 compat_nfs_string(&data->mnt_path, &compat->mnt_path); 1171 compat_nfs_string(&data->client_addr, &compat->client_addr); 1172 data->acdirmax = compat->acdirmax; 1173 data->acdirmin = compat->acdirmin; 1174 data->acregmax = compat->acregmax; 1175 data->acregmin = compat->acregmin; 1176 data->retrans = compat->retrans; 1177 data->timeo = compat->timeo; 1178 data->wsize = compat->wsize; 1179 data->rsize = compat->rsize; 1180 data->flags = compat->flags; 1181 data->version = compat->version; 1182 } 1183 1184 /* 1185 * Validate NFSv4 mount options 1186 */ 1187 static int nfs4_parse_monolithic(struct fs_context *fc, 1188 struct nfs4_mount_data *data) 1189 { 1190 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1191 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address; 1192 int ret; 1193 char *c; 1194 1195 if (!data) { 1196 if (is_remount_fc(fc)) 1197 goto done; 1198 return nfs_invalf(fc, 1199 "NFS4: mount program didn't pass any mount data"); 1200 } 1201 1202 ctx->version = 4; 1203 1204 if (data->version != 1) 1205 return generic_parse_monolithic(fc, data); 1206 1207 if (in_compat_syscall()) 1208 nfs4_compat_mount_data_conv(data); 1209 1210 if (data->host_addrlen > sizeof(ctx->nfs_server.address)) 1211 goto out_no_address; 1212 if (data->host_addrlen == 0) 1213 goto out_no_address; 1214 ctx->nfs_server.addrlen = data->host_addrlen; 1215 if (copy_from_user(sap, data->host_addr, data->host_addrlen)) 1216 return -EFAULT; 1217 if (!nfs_verify_server_address(sap)) 1218 goto out_no_address; 1219 ctx->nfs_server.port = ntohs(((struct sockaddr_in *)sap)->sin_port); 1220 1221 if (data->auth_flavourlen) { 1222 rpc_authflavor_t pseudoflavor; 1223 1224 if (data->auth_flavourlen > 1) 1225 goto out_inval_auth; 1226 if (copy_from_user(&pseudoflavor, data->auth_flavours, 1227 sizeof(pseudoflavor))) 1228 return -EFAULT; 1229 ctx->selected_flavor = pseudoflavor; 1230 } else { 1231 ctx->selected_flavor = RPC_AUTH_UNIX; 1232 } 1233 1234 c = strndup_user(data->hostname.data, NFS4_MAXNAMLEN); 1235 if (IS_ERR(c)) 1236 return PTR_ERR(c); 1237 ctx->nfs_server.hostname = c; 1238 1239 c = strndup_user(data->mnt_path.data, NFS4_MAXPATHLEN); 1240 if (IS_ERR(c)) 1241 return PTR_ERR(c); 1242 ctx->nfs_server.export_path = c; 1243 dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", c); 1244 1245 c = strndup_user(data->client_addr.data, 16); 1246 if (IS_ERR(c)) 1247 return PTR_ERR(c); 1248 ctx->client_address = c; 1249 1250 /* 1251 * Translate to nfs_fs_context, which nfs_fill_super 1252 * can deal with. 1253 */ 1254 1255 ctx->flags = data->flags & NFS4_MOUNT_FLAGMASK; 1256 ctx->rsize = data->rsize; 1257 ctx->wsize = data->wsize; 1258 ctx->timeo = data->timeo; 1259 ctx->retrans = data->retrans; 1260 ctx->acregmin = data->acregmin; 1261 ctx->acregmax = data->acregmax; 1262 ctx->acdirmin = data->acdirmin; 1263 ctx->acdirmax = data->acdirmax; 1264 ctx->nfs_server.protocol = data->proto; 1265 ret = nfs_validate_transport_protocol(fc, ctx); 1266 if (ret) 1267 return ret; 1268 done: 1269 ctx->skip_reconfig_option_check = true; 1270 return 0; 1271 1272 out_inval_auth: 1273 return nfs_invalf(fc, "NFS4: Invalid number of RPC auth flavours %d", 1274 data->auth_flavourlen); 1275 1276 out_no_address: 1277 return nfs_invalf(fc, "NFS4: mount program didn't pass remote address"); 1278 } 1279 #endif 1280 1281 /* 1282 * Parse a monolithic block of data from sys_mount(). 1283 */ 1284 static int nfs_fs_context_parse_monolithic(struct fs_context *fc, 1285 void *data) 1286 { 1287 if (fc->fs_type == &nfs_fs_type) 1288 return nfs23_parse_monolithic(fc, data); 1289 1290 #if IS_ENABLED(CONFIG_NFS_V4) 1291 if (fc->fs_type == &nfs4_fs_type) 1292 return nfs4_parse_monolithic(fc, data); 1293 #endif 1294 1295 return nfs_invalf(fc, "NFS: Unsupported monolithic data version"); 1296 } 1297 1298 /* 1299 * Validate the preparsed information in the config. 1300 */ 1301 static int nfs_fs_context_validate(struct fs_context *fc) 1302 { 1303 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1304 struct nfs_subversion *nfs_mod; 1305 struct sockaddr *sap = (struct sockaddr *)&ctx->nfs_server.address; 1306 int max_namelen = PAGE_SIZE; 1307 int max_pathlen = NFS_MAXPATHLEN; 1308 int port = 0; 1309 int ret; 1310 1311 if (!fc->source) 1312 goto out_no_device_name; 1313 1314 /* Check for sanity first. */ 1315 if (ctx->minorversion && ctx->version != 4) 1316 goto out_minorversion_mismatch; 1317 1318 if (ctx->options & NFS_OPTION_MIGRATION && 1319 (ctx->version != 4 || ctx->minorversion != 0)) 1320 goto out_migration_misuse; 1321 1322 /* Verify that any proto=/mountproto= options match the address 1323 * families in the addr=/mountaddr= options. 1324 */ 1325 if (ctx->protofamily != AF_UNSPEC && 1326 ctx->protofamily != ctx->nfs_server.address.sa_family) 1327 goto out_proto_mismatch; 1328 1329 if (ctx->mountfamily != AF_UNSPEC) { 1330 if (ctx->mount_server.addrlen) { 1331 if (ctx->mountfamily != ctx->mount_server.address.sa_family) 1332 goto out_mountproto_mismatch; 1333 } else { 1334 if (ctx->mountfamily != ctx->nfs_server.address.sa_family) 1335 goto out_mountproto_mismatch; 1336 } 1337 } 1338 1339 if (!nfs_verify_server_address(sap)) 1340 goto out_no_address; 1341 1342 ret = nfs_validate_transport_protocol(fc, ctx); 1343 if (ret) 1344 return ret; 1345 1346 if (ctx->version == 4) { 1347 if (IS_ENABLED(CONFIG_NFS_V4)) { 1348 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA) 1349 port = NFS_RDMA_PORT; 1350 else 1351 port = NFS_PORT; 1352 max_namelen = NFS4_MAXNAMLEN; 1353 max_pathlen = NFS4_MAXPATHLEN; 1354 ctx->flags &= ~(NFS_MOUNT_NONLM | NFS_MOUNT_NOACL | 1355 NFS_MOUNT_VER3 | NFS_MOUNT_LOCAL_FLOCK | 1356 NFS_MOUNT_LOCAL_FCNTL); 1357 } else { 1358 goto out_v4_not_compiled; 1359 } 1360 } else { 1361 nfs_set_mount_transport_protocol(ctx); 1362 if (ctx->nfs_server.protocol == XPRT_TRANSPORT_RDMA) 1363 port = NFS_RDMA_PORT; 1364 } 1365 1366 nfs_set_port(sap, &ctx->nfs_server.port, port); 1367 1368 ret = nfs_parse_source(fc, max_namelen, max_pathlen); 1369 if (ret < 0) 1370 return ret; 1371 1372 /* Load the NFS protocol module if we haven't done so yet */ 1373 if (!ctx->nfs_mod) { 1374 nfs_mod = get_nfs_version(ctx->version); 1375 if (IS_ERR(nfs_mod)) { 1376 ret = PTR_ERR(nfs_mod); 1377 goto out_version_unavailable; 1378 } 1379 ctx->nfs_mod = nfs_mod; 1380 } 1381 1382 /* Ensure the filesystem context has the correct fs_type */ 1383 if (fc->fs_type != ctx->nfs_mod->nfs_fs) { 1384 module_put(fc->fs_type->owner); 1385 __module_get(ctx->nfs_mod->nfs_fs->owner); 1386 fc->fs_type = ctx->nfs_mod->nfs_fs; 1387 } 1388 return 0; 1389 1390 out_no_device_name: 1391 return nfs_invalf(fc, "NFS: Device name not specified"); 1392 out_v4_not_compiled: 1393 nfs_errorf(fc, "NFS: NFSv4 is not compiled into kernel"); 1394 return -EPROTONOSUPPORT; 1395 out_no_address: 1396 return nfs_invalf(fc, "NFS: mount program didn't pass remote address"); 1397 out_mountproto_mismatch: 1398 return nfs_invalf(fc, "NFS: Mount server address does not match mountproto= option"); 1399 out_proto_mismatch: 1400 return nfs_invalf(fc, "NFS: Server address does not match proto= option"); 1401 out_minorversion_mismatch: 1402 return nfs_invalf(fc, "NFS: Mount option vers=%u does not support minorversion=%u", 1403 ctx->version, ctx->minorversion); 1404 out_migration_misuse: 1405 return nfs_invalf(fc, "NFS: 'Migration' not supported for this NFS version"); 1406 out_version_unavailable: 1407 nfs_errorf(fc, "NFS: Version unavailable"); 1408 return ret; 1409 } 1410 1411 /* 1412 * Create an NFS superblock by the appropriate method. 1413 */ 1414 static int nfs_get_tree(struct fs_context *fc) 1415 { 1416 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1417 int err = nfs_fs_context_validate(fc); 1418 1419 if (err) 1420 return err; 1421 if (!ctx->internal) 1422 return ctx->nfs_mod->rpc_ops->try_get_tree(fc); 1423 else 1424 return nfs_get_tree_common(fc); 1425 } 1426 1427 /* 1428 * Handle duplication of a configuration. The caller copied *src into *sc, but 1429 * it can't deal with resource pointers in the filesystem context, so we have 1430 * to do that. We need to clear pointers, copy data or get extra refs as 1431 * appropriate. 1432 */ 1433 static int nfs_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc) 1434 { 1435 struct nfs_fs_context *src = nfs_fc2context(src_fc), *ctx; 1436 1437 ctx = kmemdup(src, sizeof(struct nfs_fs_context), GFP_KERNEL); 1438 if (!ctx) 1439 return -ENOMEM; 1440 1441 ctx->mntfh = nfs_alloc_fhandle(); 1442 if (!ctx->mntfh) { 1443 kfree(ctx); 1444 return -ENOMEM; 1445 } 1446 nfs_copy_fh(ctx->mntfh, src->mntfh); 1447 1448 __module_get(ctx->nfs_mod->owner); 1449 ctx->client_address = NULL; 1450 ctx->mount_server.hostname = NULL; 1451 ctx->nfs_server.export_path = NULL; 1452 ctx->nfs_server.hostname = NULL; 1453 ctx->fscache_uniq = NULL; 1454 ctx->clone_data.fattr = NULL; 1455 fc->fs_private = ctx; 1456 return 0; 1457 } 1458 1459 static void nfs_fs_context_free(struct fs_context *fc) 1460 { 1461 struct nfs_fs_context *ctx = nfs_fc2context(fc); 1462 1463 if (ctx) { 1464 if (ctx->server) 1465 nfs_free_server(ctx->server); 1466 if (ctx->nfs_mod) 1467 put_nfs_version(ctx->nfs_mod); 1468 kfree(ctx->client_address); 1469 kfree(ctx->mount_server.hostname); 1470 kfree(ctx->nfs_server.export_path); 1471 kfree(ctx->nfs_server.hostname); 1472 kfree(ctx->fscache_uniq); 1473 nfs_free_fhandle(ctx->mntfh); 1474 nfs_free_fattr(ctx->clone_data.fattr); 1475 kfree(ctx); 1476 } 1477 } 1478 1479 static const struct fs_context_operations nfs_fs_context_ops = { 1480 .free = nfs_fs_context_free, 1481 .dup = nfs_fs_context_dup, 1482 .parse_param = nfs_fs_context_parse_param, 1483 .parse_monolithic = nfs_fs_context_parse_monolithic, 1484 .get_tree = nfs_get_tree, 1485 .reconfigure = nfs_reconfigure, 1486 }; 1487 1488 /* 1489 * Prepare superblock configuration. We use the namespaces attached to the 1490 * context. This may be the current process's namespaces, or it may be a 1491 * container's namespaces. 1492 */ 1493 static int nfs_init_fs_context(struct fs_context *fc) 1494 { 1495 struct nfs_fs_context *ctx; 1496 1497 ctx = kzalloc(sizeof(struct nfs_fs_context), GFP_KERNEL); 1498 if (unlikely(!ctx)) 1499 return -ENOMEM; 1500 1501 ctx->mntfh = nfs_alloc_fhandle(); 1502 if (unlikely(!ctx->mntfh)) { 1503 kfree(ctx); 1504 return -ENOMEM; 1505 } 1506 1507 ctx->protofamily = AF_UNSPEC; 1508 ctx->mountfamily = AF_UNSPEC; 1509 ctx->mount_server.port = NFS_UNSPEC_PORT; 1510 1511 if (fc->root) { 1512 /* reconfigure, start with the current config */ 1513 struct nfs_server *nfss = fc->root->d_sb->s_fs_info; 1514 struct net *net = nfss->nfs_client->cl_net; 1515 1516 ctx->flags = nfss->flags; 1517 ctx->rsize = nfss->rsize; 1518 ctx->wsize = nfss->wsize; 1519 ctx->retrans = nfss->client->cl_timeout->to_retries; 1520 ctx->selected_flavor = nfss->client->cl_auth->au_flavor; 1521 ctx->acregmin = nfss->acregmin / HZ; 1522 ctx->acregmax = nfss->acregmax / HZ; 1523 ctx->acdirmin = nfss->acdirmin / HZ; 1524 ctx->acdirmax = nfss->acdirmax / HZ; 1525 ctx->timeo = 10U * nfss->client->cl_timeout->to_initval / HZ; 1526 ctx->nfs_server.port = nfss->port; 1527 ctx->nfs_server.addrlen = nfss->nfs_client->cl_addrlen; 1528 ctx->version = nfss->nfs_client->rpc_ops->version; 1529 ctx->minorversion = nfss->nfs_client->cl_minorversion; 1530 1531 memcpy(&ctx->nfs_server.address, &nfss->nfs_client->cl_addr, 1532 ctx->nfs_server.addrlen); 1533 1534 if (fc->net_ns != net) { 1535 put_net(fc->net_ns); 1536 fc->net_ns = get_net(net); 1537 } 1538 1539 ctx->nfs_mod = nfss->nfs_client->cl_nfs_mod; 1540 __module_get(ctx->nfs_mod->owner); 1541 } else { 1542 /* defaults */ 1543 ctx->timeo = NFS_UNSPEC_TIMEO; 1544 ctx->retrans = NFS_UNSPEC_RETRANS; 1545 ctx->acregmin = NFS_DEF_ACREGMIN; 1546 ctx->acregmax = NFS_DEF_ACREGMAX; 1547 ctx->acdirmin = NFS_DEF_ACDIRMIN; 1548 ctx->acdirmax = NFS_DEF_ACDIRMAX; 1549 ctx->nfs_server.port = NFS_UNSPEC_PORT; 1550 ctx->nfs_server.protocol = XPRT_TRANSPORT_TCP; 1551 ctx->selected_flavor = RPC_AUTH_MAXFLAVOR; 1552 ctx->minorversion = 0; 1553 ctx->need_mount = true; 1554 1555 fc->s_iflags |= SB_I_STABLE_WRITES; 1556 } 1557 fc->fs_private = ctx; 1558 fc->ops = &nfs_fs_context_ops; 1559 return 0; 1560 } 1561 1562 struct file_system_type nfs_fs_type = { 1563 .owner = THIS_MODULE, 1564 .name = "nfs", 1565 .init_fs_context = nfs_init_fs_context, 1566 .parameters = nfs_fs_parameters, 1567 .kill_sb = nfs_kill_super, 1568 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 1569 }; 1570 MODULE_ALIAS_FS("nfs"); 1571 EXPORT_SYMBOL_GPL(nfs_fs_type); 1572 1573 #if IS_ENABLED(CONFIG_NFS_V4) 1574 struct file_system_type nfs4_fs_type = { 1575 .owner = THIS_MODULE, 1576 .name = "nfs4", 1577 .init_fs_context = nfs_init_fs_context, 1578 .parameters = nfs_fs_parameters, 1579 .kill_sb = nfs_kill_super, 1580 .fs_flags = FS_RENAME_DOES_D_MOVE|FS_BINARY_MOUNTDATA, 1581 }; 1582 MODULE_ALIAS_FS("nfs4"); 1583 MODULE_ALIAS("nfs4"); 1584 EXPORT_SYMBOL_GPL(nfs4_fs_type); 1585 #endif /* CONFIG_NFS_V4 */ 1586