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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 | /* * net/9p/protocol.c * * 9P Protocol Support Code * * Copyright (C) 2008 by Eric Van Hensbergen <ericvh@gmail.com> * * Base on code from Anthony Liguori <aliguori@us.ibm.com> * Copyright (C) 2008 by IBM, Corp. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ #include <linux/module.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/uaccess.h> #include <linux/slab.h> #include <linux/sched.h> #include <linux/stddef.h> #include <linux/types.h> #include <linux/uio.h> #include <net/9p/9p.h> #include <net/9p/client.h> #include "protocol.h" #include <trace/events/9p.h> static int p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...); void p9stat_free(struct p9_wstat *stbuf) { kfree(stbuf->name); kfree(stbuf->uid); kfree(stbuf->gid); kfree(stbuf->muid); kfree(stbuf->extension); } EXPORT_SYMBOL(p9stat_free); size_t pdu_read(struct p9_fcall *pdu, void *data, size_t size) { size_t len = min(pdu->size - pdu->offset, size); memcpy(data, &pdu->sdata[pdu->offset], len); pdu->offset += len; return size - len; } static size_t pdu_write(struct p9_fcall *pdu, const void *data, size_t size) { size_t len = min(pdu->capacity - pdu->size, size); memcpy(&pdu->sdata[pdu->size], data, len); pdu->size += len; return size - len; } static size_t pdu_write_u(struct p9_fcall *pdu, struct iov_iter *from, size_t size) { size_t len = min(pdu->capacity - pdu->size, size); struct iov_iter i = *from; if (!copy_from_iter_full(&pdu->sdata[pdu->size], len, &i)) len = 0; pdu->size += len; return size - len; } /* b - int8_t w - int16_t d - int32_t q - int64_t s - string u - numeric uid g - numeric gid S - stat Q - qid D - data blob (int32_t size followed by void *, results are not freed) T - array of strings (int16_t count, followed by strings) R - array of qids (int16_t count, followed by qids) A - stat for 9p2000.L (p9_stat_dotl) ? - if optional = 1, continue parsing */ static int p9pdu_vreadf(struct p9_fcall *pdu, int proto_version, const char *fmt, va_list ap) { const char *ptr; int errcode = 0; for (ptr = fmt; *ptr; ptr++) { switch (*ptr) { case 'b':{ int8_t *val = va_arg(ap, int8_t *); if (pdu_read(pdu, val, sizeof(*val))) { errcode = -EFAULT; break; } } break; case 'w':{ int16_t *val = va_arg(ap, int16_t *); __le16 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *val = le16_to_cpu(le_val); } break; case 'd':{ int32_t *val = va_arg(ap, int32_t *); __le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *val = le32_to_cpu(le_val); } break; case 'q':{ int64_t *val = va_arg(ap, int64_t *); __le64 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *val = le64_to_cpu(le_val); } break; case 's':{ char **sptr = va_arg(ap, char **); uint16_t len; errcode = p9pdu_readf(pdu, proto_version, "w", &len); if (errcode) break; *sptr = kmalloc(len + 1, GFP_NOFS); if (*sptr == NULL) { errcode = -EFAULT; break; } if (pdu_read(pdu, *sptr, len)) { errcode = -EFAULT; kfree(*sptr); *sptr = NULL; } else (*sptr)[len] = 0; } break; case 'u': { kuid_t *uid = va_arg(ap, kuid_t *); __le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *uid = make_kuid(&init_user_ns, le32_to_cpu(le_val)); } break; case 'g': { kgid_t *gid = va_arg(ap, kgid_t *); __le32 le_val; if (pdu_read(pdu, &le_val, sizeof(le_val))) { errcode = -EFAULT; break; } *gid = make_kgid(&init_user_ns, le32_to_cpu(le_val)); } break; case 'Q':{ struct p9_qid *qid = va_arg(ap, struct p9_qid *); errcode = p9pdu_readf(pdu, proto_version, "bdq", &qid->type, &qid->version, &qid->path); } break; case 'S':{ struct p9_wstat *stbuf = va_arg(ap, struct p9_wstat *); memset(stbuf, 0, sizeof(struct p9_wstat)); stbuf->n_uid = stbuf->n_muid = INVALID_UID; stbuf->n_gid = INVALID_GID; errcode = p9pdu_readf(pdu, proto_version, "wwdQdddqssss?sugu", &stbuf->size, &stbuf->type, &stbuf->dev, &stbuf->qid, &stbuf->mode, &stbuf->atime, &stbuf->mtime, &stbuf->length, &stbuf->name, &stbuf->uid, &stbuf->gid, &stbuf->muid, &stbuf->extension, &stbuf->n_uid, &stbuf->n_gid, &stbuf->n_muid); if (errcode) p9stat_free(stbuf); } break; case 'D':{ uint32_t *count = va_arg(ap, uint32_t *); void **data = va_arg(ap, void **); errcode = p9pdu_readf(pdu, proto_version, "d", count); if (!errcode) { *count = min_t(uint32_t, *count, pdu->size - pdu->offset); *data = &pdu->sdata[pdu->offset]; } } break; case 'T':{ uint16_t *nwname = va_arg(ap, uint16_t *); char ***wnames = va_arg(ap, char ***); errcode = p9pdu_readf(pdu, proto_version, "w", nwname); if (!errcode) { *wnames = kmalloc(sizeof(char *) * *nwname, GFP_NOFS); if (!*wnames) errcode = -ENOMEM; } if (!errcode) { int i; for (i = 0; i < *nwname; i++) { errcode = p9pdu_readf(pdu, proto_version, "s", &(*wnames)[i]); if (errcode) break; } } if (errcode) { if (*wnames) { int i; for (i = 0; i < *nwname; i++) kfree((*wnames)[i]); } kfree(*wnames); *wnames = NULL; } } break; case 'R':{ uint16_t *nwqid = va_arg(ap, uint16_t *); struct p9_qid **wqids = va_arg(ap, struct p9_qid **); *wqids = NULL; errcode = p9pdu_readf(pdu, proto_version, "w", nwqid); if (!errcode) { *wqids = kmalloc(*nwqid * sizeof(struct p9_qid), GFP_NOFS); if (*wqids == NULL) errcode = -ENOMEM; } if (!errcode) { int i; for (i = 0; i < *nwqid; i++) { errcode = p9pdu_readf(pdu, proto_version, "Q", &(*wqids)[i]); if (errcode) break; } } if (errcode) { kfree(*wqids); *wqids = NULL; } } break; case 'A': { struct p9_stat_dotl *stbuf = va_arg(ap, struct p9_stat_dotl *); memset(stbuf, 0, sizeof(struct p9_stat_dotl)); errcode = p9pdu_readf(pdu, proto_version, "qQdugqqqqqqqqqqqqqqq", &stbuf->st_result_mask, &stbuf->qid, &stbuf->st_mode, &stbuf->st_uid, &stbuf->st_gid, &stbuf->st_nlink, &stbuf->st_rdev, &stbuf->st_size, &stbuf->st_blksize, &stbuf->st_blocks, &stbuf->st_atime_sec, &stbuf->st_atime_nsec, &stbuf->st_mtime_sec, &stbuf->st_mtime_nsec, &stbuf->st_ctime_sec, &stbuf->st_ctime_nsec, &stbuf->st_btime_sec, &stbuf->st_btime_nsec, &stbuf->st_gen, &stbuf->st_data_version); } break; case '?': if ((proto_version != p9_proto_2000u) && (proto_version != p9_proto_2000L)) return 0; break; default: BUG(); break; } if (errcode) break; } return errcode; } int p9pdu_vwritef(struct p9_fcall *pdu, int proto_version, const char *fmt, va_list ap) { const char *ptr; int errcode = 0; for (ptr = fmt; *ptr; ptr++) { switch (*ptr) { case 'b':{ int8_t val = va_arg(ap, int); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'w':{ __le16 val = cpu_to_le16(va_arg(ap, int)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'd':{ __le32 val = cpu_to_le32(va_arg(ap, int32_t)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'q':{ __le64 val = cpu_to_le64(va_arg(ap, int64_t)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 's':{ const char *sptr = va_arg(ap, const char *); uint16_t len = 0; if (sptr) len = min_t(size_t, strlen(sptr), USHRT_MAX); errcode = p9pdu_writef(pdu, proto_version, "w", len); if (!errcode && pdu_write(pdu, sptr, len)) errcode = -EFAULT; } break; case 'u': { kuid_t uid = va_arg(ap, kuid_t); __le32 val = cpu_to_le32( from_kuid(&init_user_ns, uid)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'g': { kgid_t gid = va_arg(ap, kgid_t); __le32 val = cpu_to_le32( from_kgid(&init_user_ns, gid)); if (pdu_write(pdu, &val, sizeof(val))) errcode = -EFAULT; } break; case 'Q':{ const struct p9_qid *qid = va_arg(ap, const struct p9_qid *); errcode = p9pdu_writef(pdu, proto_version, "bdq", qid->type, qid->version, qid->path); } break; case 'S':{ const struct p9_wstat *stbuf = va_arg(ap, const struct p9_wstat *); errcode = p9pdu_writef(pdu, proto_version, "wwdQdddqssss?sugu", stbuf->size, stbuf->type, stbuf->dev, &stbuf->qid, stbuf->mode, stbuf->atime, stbuf->mtime, stbuf->length, stbuf->name, stbuf->uid, stbuf->gid, stbuf->muid, stbuf->extension, stbuf->n_uid, stbuf->n_gid, stbuf->n_muid); } break; case 'V':{ uint32_t count = va_arg(ap, uint32_t); struct iov_iter *from = va_arg(ap, struct iov_iter *); errcode = p9pdu_writef(pdu, proto_version, "d", count); if (!errcode && pdu_write_u(pdu, from, count)) errcode = -EFAULT; } break; case 'T':{ uint16_t nwname = va_arg(ap, int); const char **wnames = va_arg(ap, const char **); errcode = p9pdu_writef(pdu, proto_version, "w", nwname); if (!errcode) { int i; for (i = 0; i < nwname; i++) { errcode = p9pdu_writef(pdu, proto_version, "s", wnames[i]); if (errcode) break; } } } break; case 'R':{ uint16_t nwqid = va_arg(ap, int); struct p9_qid *wqids = va_arg(ap, struct p9_qid *); errcode = p9pdu_writef(pdu, proto_version, "w", nwqid); if (!errcode) { int i; for (i = 0; i < nwqid; i++) { errcode = p9pdu_writef(pdu, proto_version, "Q", &wqids[i]); if (errcode) break; } } } break; case 'I':{ struct p9_iattr_dotl *p9attr = va_arg(ap, struct p9_iattr_dotl *); errcode = p9pdu_writef(pdu, proto_version, "ddugqqqqq", p9attr->valid, p9attr->mode, p9attr->uid, p9attr->gid, p9attr->size, p9attr->atime_sec, p9attr->atime_nsec, p9attr->mtime_sec, p9attr->mtime_nsec); } break; case '?': if ((proto_version != p9_proto_2000u) && (proto_version != p9_proto_2000L)) return 0; break; default: BUG(); break; } if (errcode) break; } return errcode; } int p9pdu_readf(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = p9pdu_vreadf(pdu, proto_version, fmt, ap); va_end(ap); return ret; } static int p9pdu_writef(struct p9_fcall *pdu, int proto_version, const char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = p9pdu_vwritef(pdu, proto_version, fmt, ap); va_end(ap); return ret; } int p9stat_read(struct p9_client *clnt, char *buf, int len, struct p9_wstat *st) { struct p9_fcall fake_pdu; int ret; fake_pdu.size = len; fake_pdu.capacity = len; fake_pdu.sdata = buf; fake_pdu.offset = 0; ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "S", st); if (ret) { p9_debug(P9_DEBUG_9P, "<<< p9stat_read failed: %d\n", ret); trace_9p_protocol_dump(clnt, &fake_pdu); } return ret; } EXPORT_SYMBOL(p9stat_read); int p9pdu_prepare(struct p9_fcall *pdu, int16_t tag, int8_t type) { pdu->id = type; return p9pdu_writef(pdu, 0, "dbw", 0, type, tag); } int p9pdu_finalize(struct p9_client *clnt, struct p9_fcall *pdu) { int size = pdu->size; int err; pdu->size = 0; err = p9pdu_writef(pdu, 0, "d", size); pdu->size = size; trace_9p_protocol_dump(clnt, pdu); p9_debug(P9_DEBUG_9P, ">>> size=%d type: %d tag: %d\n", pdu->size, pdu->id, pdu->tag); return err; } void p9pdu_reset(struct p9_fcall *pdu) { pdu->offset = 0; pdu->size = 0; } int p9dirent_read(struct p9_client *clnt, char *buf, int len, struct p9_dirent *dirent) { struct p9_fcall fake_pdu; int ret; char *nameptr; fake_pdu.size = len; fake_pdu.capacity = len; fake_pdu.sdata = buf; fake_pdu.offset = 0; ret = p9pdu_readf(&fake_pdu, clnt->proto_version, "Qqbs", &dirent->qid, &dirent->d_off, &dirent->d_type, &nameptr); if (ret) { p9_debug(P9_DEBUG_9P, "<<< p9dirent_read failed: %d\n", ret); trace_9p_protocol_dump(clnt, &fake_pdu); goto out; } strcpy(dirent->d_name, nameptr); kfree(nameptr); out: return fake_pdu.offset; } EXPORT_SYMBOL(p9dirent_read); |