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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 | /* * sock.c * * Copyright (C) 1995 by Paal-Kr. Engstad and Volker Lendecke * */ #include <linux/sched.h> #include <linux/smb_fs.h> #include <linux/errno.h> #include <linux/socket.h> #include <linux/fcntl.h> #include <linux/stat.h> #include <asm/segment.h> #include <linux/in.h> #include <linux/net.h> #include <linux/mm.h> #include <linux/netdevice.h> #include <net/ip.h> #include <linux/smb.h> #include <linux/smbno.h> #define _S(nr) (1<<((nr)-1)) static int _recvfrom(struct socket *sock, unsigned char *ubuf, int size, int noblock, unsigned flags, struct sockaddr_in *sa, int *addr_len) { struct iovec iov; struct msghdr msg; iov.iov_base = ubuf; iov.iov_len = size; msg.msg_name = (void *)sa; msg.msg_namelen = 0; if (addr_len) msg.msg_namelen = *addr_len; msg.msg_control = NULL; msg.msg_iov = &iov; msg.msg_iovlen = 1; return sock->ops->recvmsg(sock, &msg, size, noblock, flags, addr_len); } static int _send(struct socket *sock, const void *buff, int len, int nonblock, unsigned flags) { struct iovec iov; struct msghdr msg; iov.iov_base = (void *)buff; iov.iov_len = len; msg.msg_name = NULL; msg.msg_namelen = 0; msg.msg_control = NULL; msg.msg_iov = &iov; msg.msg_iovlen = 1; return sock->ops->sendmsg(sock, &msg, len, nonblock, flags); } static void smb_data_callback(struct sock *sk,int len) { struct socket *sock = sk->socket; if(!sk->dead) { unsigned char peek_buf[4]; int result; unsigned short fs; fs = get_fs(); set_fs(get_ds()); result = _recvfrom(sock, (void *)peek_buf, 1, 1, MSG_PEEK, NULL, NULL); while ((result != -EAGAIN) && (peek_buf[0] == 0x85)) { /* got SESSION KEEP ALIVE */ result = _recvfrom(sock, (void *)peek_buf, 4, 1, 0, NULL, NULL); DDPRINTK("smb_data_callback:" " got SESSION KEEP ALIVE\n"); if (result == -EAGAIN) break; result = _recvfrom(sock, (void *)peek_buf, 1, 1, MSG_PEEK, NULL, NULL); } set_fs(fs); if (result != -EAGAIN) { wake_up_interruptible(sk->sleep); } } } int smb_catch_keepalive(struct smb_server *server) { struct file *file; struct inode *inode; struct socket *sock; struct sock *sk; if ( (server == NULL) || ((file = server->sock_file) == NULL) || ((inode = file->f_inode) == NULL) || (!S_ISSOCK(inode->i_mode))) { printk("smb_catch_keepalive: did not get valid server!\n"); server->data_ready = NULL; return -EINVAL; } sock = &(inode->u.socket_i); if (sock->type != SOCK_STREAM) { printk("smb_catch_keepalive: did not get SOCK_STREAM\n"); server->data_ready = NULL; return -EINVAL; } sk = (struct sock *)(sock->data); if (sk == NULL) { printk("smb_catch_keepalive: sk == NULL"); server->data_ready = NULL; return -EINVAL; } DDPRINTK("smb_catch_keepalive.: sk->d_r = %x, server->d_r = %x\n", (unsigned int)(sk->data_ready), (unsigned int)(server->data_ready)); if (sk->data_ready == smb_data_callback) { printk("smb_catch_keepalive: already done\n"); return -EINVAL; } server->data_ready = sk->data_ready; sk->data_ready = smb_data_callback; return 0; } int smb_dont_catch_keepalive(struct smb_server *server) { struct file *file; struct inode *inode; struct socket *sock; struct sock *sk; if ( (server == NULL) || ((file = server->sock_file) == NULL) || ((inode = file->f_inode) == NULL) || (!S_ISSOCK(inode->i_mode))) { printk("smb_dont_catch_keepalive: " "did not get valid server!\n"); return -EINVAL; } sock = &(inode->u.socket_i); if (sock->type != SOCK_STREAM) { printk("smb_dont_catch_keepalive: did not get SOCK_STREAM\n"); return -EINVAL; } sk = (struct sock *)(sock->data); if (sk == NULL) { printk("smb_dont_catch_keepalive: sk == NULL"); return -EINVAL; } if (server->data_ready == NULL) { printk("smb_dont_catch_keepalive: " "server->data_ready == NULL\n"); return -EINVAL; } if (sk->data_ready != smb_data_callback) { printk("smb_dont_catch_keepalive: " "sk->data_callback != smb_data_callback\n"); return -EINVAL; } DDPRINTK("smb_dont_catch_keepalive: sk->d_r = %x, server->d_r = %x\n", (unsigned int)(sk->data_ready), (unsigned int)(server->data_ready)); sk->data_ready = server->data_ready; server->data_ready = NULL; return 0; } /* * smb_receive_raw * fs points to the correct segment, sock != NULL, target != NULL * The smb header is only stored if want_header != 0. */ static int smb_receive_raw(struct socket *sock, unsigned char *target, int max_raw_length, int want_header) { int len, result; int already_read; unsigned char peek_buf[4]; unsigned short fs; /* We fool the kernel to believe we call from user space. */ re_recv: fs = get_fs(); set_fs(get_ds()); result = _recvfrom(sock, (void *)peek_buf, 4, 0, 0, NULL, NULL); set_fs(fs); if (result < 0) { DPRINTK("smb_receive_raw: recv error = %d\n", -result); return result; } if (result < 4) { DPRINTK("smb_receive_raw: got less than 4 bytes\n"); return -EIO; } switch (peek_buf[0]) { case 0x00: case 0x82: break; case 0x85: DPRINTK("smb_receive_raw: Got SESSION KEEP ALIVE\n"); goto re_recv; default: printk("smb_receive_raw: Invalid packet\n"); return -EIO; } /* The length in the RFC NB header is the raw data length */ len = smb_len(peek_buf); if (len > max_raw_length) { printk("smb_receive_raw: Received length (%d) > max_xmit (%d)!\n", len, max_raw_length); return -EIO; } if (want_header != 0) { memcpy_tofs(target, peek_buf, 4); target += 4; } already_read = 0; while (already_read < len) { result = _recvfrom(sock, (void *)(target+already_read), len - already_read, 0, 0, NULL, NULL); if (result < 0) { printk("smb_receive_raw: recvfrom error = %d\n", -result); return result; } already_read += result; } return already_read; } /* * smb_receive * fs points to the correct segment, server != NULL, sock!=NULL */ static int smb_receive(struct smb_server *server, struct socket *sock) { int result; result = smb_receive_raw(sock, server->packet, server->max_xmit - 4, /* max_xmit in server includes NB header */ 1); /* We want the header */ if (result < 0) { printk("smb_receive: receive error: %d\n", result); return result; } server->rcls = *((unsigned char *)(server->packet+9)); server->err = *((unsigned short *)(server->packet+11)); if (server->rcls != 0) { DPRINTK("smb_receive: rcls=%d, err=%d\n", server->rcls, server->err); } return result; } /* * smb_receive's preconditions also apply here. */ static int smb_receive_trans2(struct smb_server *server, struct socket *sock, int *data_len, int *param_len, char **data, char **param) { int total_data=0; int total_param=0; int result; unsigned char *inbuf = server->packet; *data_len = *param_len = 0; DDPRINTK("smb_receive_trans2: enter\n"); if ((result = smb_receive(server, sock)) < 0) { return result; } if (server->rcls != 0) { return result; } /* parse out the lengths */ total_data = WVAL(inbuf,smb_tdrcnt); total_param = WVAL(inbuf,smb_tprcnt); if ( (total_data > TRANS2_MAX_TRANSFER) || (total_param > TRANS2_MAX_TRANSFER)) { printk("smb_receive_trans2: data/param too long\n"); return -EIO; } /* allocate it */ if ((*data = smb_kmalloc(total_data, GFP_KERNEL)) == NULL) { printk("smb_receive_trans2: could not alloc data area\n"); return -ENOMEM; } if ((*param = smb_kmalloc(total_param, GFP_KERNEL)) == NULL) { printk("smb_receive_trans2: could not alloc param area\n"); smb_kfree_s(*data, total_data); return -ENOMEM; } DDPRINTK("smb_rec_trans2: total_data/param: %d/%d\n", total_data, total_param); while (1) { if (WVAL(inbuf,smb_prdisp)+WVAL(inbuf, smb_prcnt) > total_param) { printk("smb_receive_trans2: invalid parameters\n"); result = -EIO; goto fail; } memcpy(*param + WVAL(inbuf,smb_prdisp), smb_base(inbuf) + WVAL(inbuf,smb_proff), WVAL(inbuf,smb_prcnt)); *param_len += WVAL(inbuf,smb_prcnt); if (WVAL(inbuf,smb_drdisp)+WVAL(inbuf, smb_drcnt)>total_data) { printk("smb_receive_trans2: invalid data block\n"); result = -EIO; goto fail; } memcpy(*data + WVAL(inbuf,smb_drdisp), smb_base(inbuf) + WVAL(inbuf,smb_droff), WVAL(inbuf,smb_drcnt)); *data_len += WVAL(inbuf,smb_drcnt); DDPRINTK("smb_rec_trans2: drcnt/prcnt: %d/%d\n", WVAL(inbuf, smb_drcnt), WVAL(inbuf, smb_prcnt)); /* parse out the total lengths again - they can shrink! */ if ( (WVAL(inbuf,smb_tdrcnt) > total_data) || (WVAL(inbuf,smb_tprcnt) > total_param)) { printk("smb_receive_trans2: data/params grew!\n"); result = -EIO; goto fail; } total_data = WVAL(inbuf,smb_tdrcnt); total_param = WVAL(inbuf,smb_tprcnt); if (total_data <= *data_len && total_param <= *param_len) break; if ((result = smb_receive(server, sock)) < 0) { goto fail; } if (server->rcls != 0) { result = -EIO; goto fail; } } DDPRINTK("smb_receive_trans2: normal exit\n"); return 0; fail: DPRINTK("smb_receive_trans2: failed exit\n"); smb_kfree_s(*param, 0); *param = NULL; smb_kfree_s(*data, 0); *data = NULL; return result; } static inline struct socket * server_sock(struct smb_server *server) { struct file *file; struct inode *inode; if (server == NULL) return NULL; if ((file = server->sock_file) == NULL) return NULL; if ((inode = file->f_inode) == NULL) return NULL; return &(inode->u.socket_i); } int smb_release(struct smb_server *server) { struct socket *sock = server_sock(server); int result; if (sock == NULL) return -EINVAL; result = sock->ops->release(sock, NULL); DPRINTK("smb_release: sock->ops->release = %d\n", result); /* inet_release does not set sock->state. Maybe someone is confused about sock->state being SS_CONNECTED while there is nothing behind it, so I set it to SS_UNCONNECTED.*/ sock->state = SS_UNCONNECTED; result = sock->ops->create(sock, 0); DPRINTK("smb_release: sock->ops->create = %d\n", result); return result; } int smb_connect(struct smb_server *server) { struct socket *sock = server_sock(server); if (sock == NULL) return -EINVAL; if (sock->state != SS_UNCONNECTED) { DPRINTK("smb_connect: socket is not unconnected: %d\n", sock->state); } return sock->ops->connect(sock, (struct sockaddr *)&(server->m.addr), sizeof(struct sockaddr_in), 0); } /*****************************************************************************/ /* */ /* This routine was once taken from nfs, which is for udp. Here TCP does */ /* most of the ugly stuff for us (thanks, Alan!) */ /* */ /*****************************************************************************/ int smb_request(struct smb_server *server) { unsigned long old_mask; unsigned short fs; /* We fool the kernel to believe we call from user space. */ int len, result, result2; struct socket *sock = server_sock(server); unsigned char *buffer = (server == NULL) ? NULL : server->packet; if ((sock == NULL) || (buffer == NULL)) { printk("smb_request: Bad server!\n"); return -EBADF; } if (server->state != CONN_VALID) return -EIO; if ((result = smb_dont_catch_keepalive(server)) != 0) { server->state = CONN_INVALID; smb_invalidate_all_inodes(server); return result; } len = smb_len(buffer) + 4; DDPRINTK("smb_request: len = %d cmd = 0x%X\n", len, buffer[8]); old_mask = current->blocked; current->blocked |= ~(_S(SIGKILL) | _S(SIGSTOP)); fs = get_fs(); set_fs(get_ds()); result = _send(sock, (void *)buffer, len, 0, 0); if (result < 0) { printk("smb_request: send error = %d\n", result); } else { result = smb_receive(server, sock); } /* read/write errors are handled by errno */ current->signal &= ~_S(SIGPIPE); current->blocked = old_mask; set_fs(fs); if ((result2 = smb_catch_keepalive(server)) < 0) { result = result2; } if (result < 0) { server->state = CONN_INVALID; smb_invalidate_all_inodes(server); } DDPRINTK("smb_request: result = %d\n", result); return result; } /* * This is not really a trans2 request, we assume that you only have * one packet to send. */ int smb_trans2_request(struct smb_server *server, int *data_len, int *param_len, char **data, char **param) { unsigned long old_mask; unsigned short fs; /* We fool the kernel to believe we call from user space. */ int len, result, result2; struct socket *sock = server_sock(server); unsigned char *buffer = (server == NULL) ? NULL : server->packet; if ((sock == NULL) || (buffer == NULL)) { printk("smb_trans2_request: Bad server!\n"); return -EBADF; } if (server->state != CONN_VALID) return -EIO; if ((result = smb_dont_catch_keepalive(server)) != 0) { server->state = CONN_INVALID; smb_invalidate_all_inodes(server); return result; } len = smb_len(buffer) + 4; old_mask = current->blocked; current->blocked |= ~(_S(SIGKILL) | _S(SIGSTOP)); fs = get_fs(); set_fs(get_ds()); DDPRINTK("smb_request: len = %d cmd = 0x%X\n", len, buffer[8]); result = _send(sock, (void *)buffer, len, 0, 0); if (result < 0) { printk("smb_trans2_request: send error = %d\n", result); } else { result = smb_receive_trans2(server, sock, data_len, param_len, data, param); } /* read/write errors are handled by errno */ current->signal &= ~_S(SIGPIPE); current->blocked = old_mask; set_fs(fs); if ((result2 = smb_catch_keepalive(server)) < 0) { result = result2; } if (result < 0) { server->state = CONN_INVALID; smb_invalidate_all_inodes(server); } DDPRINTK("smb_trans2_request: result = %d\n", result); return result; } /* target must be in user space */ int smb_request_read_raw(struct smb_server *server, unsigned char *target, int max_len) { unsigned long old_mask; int len, result, result2; unsigned short fs; /* We fool the kernel to believe we call from user space. */ struct socket *sock = server_sock(server); unsigned char *buffer = (server == NULL) ? NULL : server->packet; if ((sock == NULL) || (buffer == NULL)) { printk("smb_request_read_raw: Bad server!\n"); return -EBADF; } if (server->state != CONN_VALID) return -EIO; if ((result = smb_dont_catch_keepalive(server)) != 0) { server->state = CONN_INVALID; smb_invalidate_all_inodes(server); return result; } len = smb_len(buffer) + 4; old_mask = current->blocked; current->blocked |= ~(_S(SIGKILL) | _S(SIGSTOP)); fs = get_fs(); set_fs(get_ds()); DPRINTK("smb_request_read_raw: len = %d cmd = 0x%X\n", len, buffer[8]); DPRINTK("smb_request_read_raw: target=%X, max_len=%d\n", (unsigned int)target, max_len); DPRINTK("smb_request_read_raw: buffer=%X, sock=%X\n", (unsigned int)buffer, (unsigned int)sock); result = _send(sock, (void *)buffer, len, 0, 0); DPRINTK("smb_request_read_raw: send returned %d\n", result); set_fs(fs); /* We recv into user space */ if (result < 0) { printk("smb_request_read_raw: send error = %d\n", result); } else { result = smb_receive_raw(sock, target, max_len, 0); } /* read/write errors are handled by errno */ current->signal &= ~_S(SIGPIPE); current->blocked = old_mask; if ((result2 = smb_catch_keepalive(server)) < 0) { result = result2; } if (result < 0) { server->state = CONN_INVALID; smb_invalidate_all_inodes(server); } DPRINTK("smb_request_read_raw: result = %d\n", result); return result; } /* Source must be in user space. smb_request_write_raw assumes that * the request SMBwriteBraw has been completed successfully, so that * we can send the raw data now. */ int smb_request_write_raw(struct smb_server *server, unsigned const char *source, int length) { unsigned long old_mask; int result, result2; unsigned short fs; /* We fool the kernel to believe we call from user space. */ byte nb_header[4]; struct socket *sock = server_sock(server); unsigned char *buffer = (server == NULL) ? NULL : server->packet; if ((sock == NULL) || (buffer == NULL)) { printk("smb_request_write_raw: Bad server!\n"); return -EBADF; } if (server->state != CONN_VALID) return -EIO; if ((result = smb_dont_catch_keepalive(server)) != 0) { server->state = CONN_INVALID; smb_invalidate_all_inodes(server); return result; } old_mask = current->blocked; current->blocked |= ~(_S(SIGKILL) | _S(SIGSTOP)); fs = get_fs(); set_fs(get_ds()); smb_encode_smb_length(nb_header, length); result = _send(sock, (void *)nb_header, 4, 0, 0); if (result == 4) { set_fs(fs); /* source is in user-land */ result = _send(sock, (void *)source, length, 0, 0); set_fs(get_ds()); } else { result = -EIO; } DPRINTK("smb_request_write_raw: send returned %d\n", result); if (result == length) { result = smb_receive(server, sock); } else { result = -EIO; } /* read/write errors are handled by errno */ current->signal &= ~_S(SIGPIPE); current->blocked = old_mask; set_fs(fs); if ((result2 = smb_catch_keepalive(server)) < 0) { result = result2; } if (result < 0) { server->state = CONN_INVALID; smb_invalidate_all_inodes(server); } if (result > 0) { result = length; } DPRINTK("smb_request_write_raw: result = %d\n", result); return result; } |