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