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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 | /* * linux/net/sunrpc/rpcclnt.c * * This file contains the high-level RPC interface. * It is modeled as a finite state machine to support both synchronous * and asynchronous requests. * * - RPC header generation and argument serialization. * - Credential refresh. * - TCP reconnect handling (when finished). * - Retry of operation when it is suspected the operation failed because * of uid squashing on the server, or when the credentials were stale * and need to be refreshed, or when a packet was damaged in transit. * This may be have to be moved to the VFS layer. * * NB: BSD uses a more intelligent approach to guessing when a request * or reply has been lost by keeping the RTO estimate for each procedure. * We currently make do with a constant timeout value. * * Copyright (C) 1992,1993 Rick Sladkey <jrs@world.std.com> * Copyright (C) 1995,1996 Olaf Kirch <okir@monad.swb.de> */ #include <asm/system.h> #include <asm/segment.h> #include <linux/types.h> #include <linux/mm.h> #include <linux/malloc.h> #include <linux/in.h> #include <linux/utsname.h> #include <linux/sunrpc/clnt.h> #define RPC_SLACK_SPACE 1024 /* total overkill */ #ifdef RPC_DEBUG # define RPCDBG_FACILITY RPCDBG_CALL #endif static DECLARE_WAIT_QUEUE_HEAD(destroy_wait); static void call_bind(struct rpc_task *task); static void call_reserve(struct rpc_task *task); static void call_reserveresult(struct rpc_task *task); static void call_allocate(struct rpc_task *task); static void call_encode(struct rpc_task *task); static void call_decode(struct rpc_task *task); static void call_transmit(struct rpc_task *task); static void call_receive(struct rpc_task *task); static void call_status(struct rpc_task *task); static void call_refresh(struct rpc_task *task); static void call_refreshresult(struct rpc_task *task); static void call_timeout(struct rpc_task *task); static void call_reconnect(struct rpc_task *task); static u32 * call_header(struct rpc_task *task); static u32 * call_verify(struct rpc_task *task); /* * Create an RPC client * FIXME: This should also take a flags argument (as in task->tk_flags). * It's called (among others) from pmap_create_client, which may in * turn be called by an async task. In this case, rpciod should not be * made to sleep too long. */ struct rpc_clnt * rpc_create_client(struct rpc_xprt *xprt, char *servname, struct rpc_program *program, u32 vers, int flavor) { struct rpc_version *version; struct rpc_clnt *clnt = NULL; dprintk("RPC: creating %s client for %s (xprt %p)\n", program->name, servname, xprt); #ifdef RPC_DEBUG rpc_register_sysctl(); #endif if (!xprt) goto out; if (vers >= program->nrvers || !(version = program->version[vers])) goto out; clnt = (struct rpc_clnt *) rpc_allocate(0, sizeof(*clnt)); if (!clnt) goto out_no_clnt; memset(clnt, 0, sizeof(*clnt)); clnt->cl_xprt = xprt; clnt->cl_procinfo = version->procs; clnt->cl_maxproc = version->nrprocs; clnt->cl_server = servname; clnt->cl_protname = program->name; clnt->cl_port = xprt->addr.sin_port; clnt->cl_prog = program->number; clnt->cl_vers = version->number; clnt->cl_prot = IPPROTO_UDP; clnt->cl_stats = program->stats; clnt->cl_bindwait = RPC_INIT_WAITQ("bindwait"); if (!clnt->cl_port) clnt->cl_autobind = 1; if (!rpcauth_create(flavor, clnt)) goto out_no_auth; /* save the nodename */ clnt->cl_nodelen = strlen(system_utsname.nodename); if (clnt->cl_nodelen > UNX_MAXNODENAME) clnt->cl_nodelen = UNX_MAXNODENAME; memcpy(clnt->cl_nodename, system_utsname.nodename, clnt->cl_nodelen); out: return clnt; out_no_clnt: printk("RPC: out of memory in rpc_create_client\n"); goto out; out_no_auth: printk("RPC: Couldn't create auth handle (flavor %d)\n", flavor); rpc_free(clnt); clnt = NULL; goto out; } /* * Properly shut down an RPC client, terminating all outstanding * requests. Note that we must be certain that cl_oneshot and * cl_dead are cleared, or else the client would be destroyed * when the last task releases it. */ int rpc_shutdown_client(struct rpc_clnt *clnt) { dprintk("RPC: shutting down %s client for %s\n", clnt->cl_protname, clnt->cl_server); while (clnt->cl_users) { #ifdef RPC_DEBUG printk("rpc_shutdown_client: client %s, tasks=%d\n", clnt->cl_protname, clnt->cl_users); #endif /* Don't let rpc_release_client destroy us */ clnt->cl_oneshot = 0; clnt->cl_dead = 0; rpc_killall_tasks(clnt); sleep_on(&destroy_wait); } return rpc_destroy_client(clnt); } /* * Delete an RPC client */ int rpc_destroy_client(struct rpc_clnt *clnt) { dprintk("RPC: destroying %s client for %s\n", clnt->cl_protname, clnt->cl_server); if (clnt->cl_auth) { rpcauth_destroy(clnt->cl_auth); clnt->cl_auth = NULL; } if (clnt->cl_xprt) { xprt_destroy(clnt->cl_xprt); clnt->cl_xprt = NULL; } rpc_free(clnt); return 0; } /* * Release an RPC client */ void rpc_release_client(struct rpc_clnt *clnt) { dprintk("RPC: rpc_release_client(%p, %d)\n", clnt, clnt->cl_users); if (clnt->cl_users) { if (--(clnt->cl_users) > 0) return; } else printk("rpc_release_client: %s client already free??\n", clnt->cl_protname); wake_up(&destroy_wait); if (clnt->cl_oneshot || clnt->cl_dead) rpc_destroy_client(clnt); } /* * Default callback for async RPC calls */ static void rpc_default_callback(struct rpc_task *task) { rpc_release_task(task); } /* * Export the signal mask handling for aysnchronous code that * sleeps on RPC calls */ void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset) { unsigned long sigallow = sigmask(SIGKILL); unsigned long irqflags; /* Turn off various signals */ if (clnt->cl_intr) { struct k_sigaction *action = current->sig->action; if (action[SIGINT-1].sa.sa_handler == SIG_DFL) sigallow |= sigmask(SIGINT); if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL) sigallow |= sigmask(SIGQUIT); } spin_lock_irqsave(¤t->sigmask_lock, irqflags); *oldset = current->blocked; siginitsetinv(¤t->blocked, sigallow & ~oldset->sig[0]); recalc_sigpending(current); spin_unlock_irqrestore(¤t->sigmask_lock, irqflags); } void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset) { unsigned long irqflags; spin_lock_irqsave(¤t->sigmask_lock, irqflags); current->blocked = *oldset; recalc_sigpending(current); spin_unlock_irqrestore(¤t->sigmask_lock, irqflags); } /* * New rpc_call implementation */ int rpc_do_call(struct rpc_clnt *clnt, u32 proc, void *argp, void *resp, int flags, rpc_action func, void *data) { struct rpc_task my_task, *task = &my_task; sigset_t oldset; int async, status; /* If this client is slain all further I/O fails */ if (clnt->cl_dead) return -EIO; rpc_clnt_sigmask(clnt, &oldset); /* Create/initialize a new RPC task */ if ((async = (flags & RPC_TASK_ASYNC)) != 0) { if (!func) func = rpc_default_callback; status = -ENOMEM; if (!(task = rpc_new_task(clnt, func, flags))) goto out; task->tk_calldata = data; } else { rpc_init_task(task, clnt, NULL, flags); } /* Bind the user cred, set up the call info struct and * execute the task */ if (rpcauth_lookupcred(task) != NULL) { rpc_call_setup(task, proc, argp, resp, 0); rpc_execute(task); } else async = 0; status = 0; if (!async) { status = task->tk_status; rpc_release_task(task); } out: rpc_clnt_sigunmask(clnt, &oldset); return status; } void rpc_call_setup(struct rpc_task *task, u32 proc, void *argp, void *resp, int flags) { task->tk_action = call_bind; task->tk_proc = proc; task->tk_argp = argp; task->tk_resp = resp; task->tk_flags |= flags; /* Increment call count */ if (task->tk_proc < task->tk_client->cl_maxproc) rpcproc_count(task->tk_client, proc)++; } /* * Restart an (async) RPC call. Usually called from within the * exit handler. */ void rpc_restart_call(struct rpc_task *task) { if (task->tk_flags & RPC_TASK_KILLED) { rpc_release_task(task); return; } task->tk_action = call_bind; rpcproc_count(task->tk_client, task->tk_proc)++; } /* * 0. Get the server port number if not yet set */ static void call_bind(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; struct rpc_xprt *xprt = clnt->cl_xprt; if (xprt->stream && !xprt->connected) task->tk_action = call_reconnect; else task->tk_action = call_reserve; task->tk_status = 0; if (!clnt->cl_port) rpc_getport(task, clnt); } /* * 1. Reserve an RPC call slot */ static void call_reserve(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; dprintk("RPC: %4d call_reserve\n", task->tk_pid); if (!clnt->cl_port) { printk(KERN_NOTICE "%s: couldn't bind to server %s - %s.\n", clnt->cl_protname, clnt->cl_server, clnt->cl_softrtry? "giving up" : "retrying"); if (!clnt->cl_softrtry) { task->tk_action = call_bind; rpc_delay(task, 5*HZ); return; } rpc_exit(task, -EIO); return; } if (!rpcauth_uptodatecred(task)) { task->tk_action = call_refresh; return; } task->tk_action = call_reserveresult; task->tk_timeout = clnt->cl_timeout.to_resrvval; task->tk_status = 0; clnt->cl_stats->rpccnt++; xprt_reserve(task); } /* * 1b. Grok the result of xprt_reserve() */ static void call_reserveresult(struct rpc_task *task) { dprintk("RPC: %4d call_reserveresult (status %d)\n", task->tk_pid, task->tk_status); /* * After a call to xprt_reserve(), we must have either * a request slot or else an error status. */ if ((task->tk_status >= 0 && !task->tk_rqstp) || (task->tk_status < 0 && task->tk_rqstp)) printk("call_reserveresult: status=%d, request=%p??\n", task->tk_status, task->tk_rqstp); if (task->tk_status >= 0) { task->tk_action = call_allocate; return; } switch (task->tk_status) { case -EAGAIN: case -ENOBUFS: task->tk_timeout = task->tk_client->cl_timeout.to_resrvval; task->tk_status = 0; task->tk_action = call_reserve; break; case -ETIMEDOUT: dprintk("RPC: task timed out\n"); task->tk_action = call_timeout; break; default: task->tk_action = NULL; if (!task->tk_rqstp) { printk("RPC: task has no request, exit EIO\n"); rpc_exit(task, -EIO); } } } /* * 2. Allocate the buffer. For details, see sched.c:rpc_malloc. * (Note: buffer memory is freed in rpc_task_release). */ static void call_allocate(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; unsigned int bufsiz; dprintk("RPC: %4d call_allocate (status %d)\n", task->tk_pid, task->tk_status); task->tk_action = call_encode; if (task->tk_buffer) return; /* FIXME: compute buffer requirements more exactly using * auth->au_wslack */ bufsiz = rpcproc_bufsiz(clnt, task->tk_proc) + RPC_SLACK_SPACE; if ((task->tk_buffer = rpc_malloc(task, bufsiz)) != NULL) return; printk("RPC: buffer allocation failed for task %p\n", task); if (!signalled()) { xprt_release(task); task->tk_action = call_reserve; rpc_delay(task, HZ>>4); return; } rpc_exit(task, -ERESTARTSYS); } /* * 3. Encode arguments of an RPC call */ static void call_encode(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; struct rpc_rqst *req = task->tk_rqstp; unsigned int bufsiz; kxdrproc_t encode; int status; u32 *p; dprintk("RPC: %4d call_encode (status %d)\n", task->tk_pid, task->tk_status); task->tk_action = call_transmit; /* Default buffer setup */ bufsiz = rpcproc_bufsiz(clnt, task->tk_proc)+RPC_SLACK_SPACE; req->rq_svec[0].iov_base = task->tk_buffer; req->rq_svec[0].iov_len = bufsiz; req->rq_slen = 0; req->rq_snr = 1; req->rq_rvec[0].iov_base = task->tk_buffer; req->rq_rvec[0].iov_len = bufsiz; req->rq_rlen = bufsiz; req->rq_rnr = 1; req->rq_damaged = 0; if (task->tk_proc > clnt->cl_maxproc) { printk(KERN_WARNING "%s (vers %d): bad procedure number %d\n", clnt->cl_protname, clnt->cl_vers, task->tk_proc); rpc_exit(task, -EIO); return; } /* Zero buffer so we have automatic zero-padding of opaque & string */ memset(task->tk_buffer, 0, bufsiz); /* Encode header and provided arguments */ encode = rpcproc_encode(clnt, task->tk_proc); if (!(p = call_header(task))) { printk("RPC: call_header failed, exit EIO\n"); rpc_exit(task, -EIO); } else if (encode && (status = encode(req, p, task->tk_argp)) < 0) { printk(KERN_WARNING "%s: can't encode arguments: %d\n", clnt->cl_protname, -status); rpc_exit(task, status); } } /* * 4. Transmit the RPC request */ static void call_transmit(struct rpc_task *task) { dprintk("RPC: %4d call_transmit (status %d)\n", task->tk_pid, task->tk_status); task->tk_action = call_receive; task->tk_status = 0; xprt_transmit(task); } /* * 5. Wait for the RPC reply */ static void call_receive(struct rpc_task *task) { dprintk("RPC: %4d call_receive (status %d)\n", task->tk_pid, task->tk_status); task->tk_action = call_status; /* Need to ensure cleanups are performed by xprt_receive_status() */ xprt_receive(task); /* If we have no decode function, this means we're performing * a void call (a la lockd message passing). */ if (!rpcproc_decode(task->tk_client, task->tk_proc)) { task->tk_action = NULL; return; } } /* * 6. Sort out the RPC call status */ static void call_status(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; struct rpc_xprt *xprt = clnt->cl_xprt; struct rpc_rqst *req; int status = task->tk_status; dprintk("RPC: %4d call_status (status %d)\n", task->tk_pid, task->tk_status); if (status >= 0) { task->tk_action = call_decode; return; } task->tk_status = 0; req = task->tk_rqstp; switch(status) { case -ETIMEDOUT: task->tk_action = call_timeout; break; case -EAGAIN: if (!req) task->tk_action = call_reserve; else if (!task->tk_buffer) task->tk_action = call_allocate; else if (req->rq_damaged) { task->tk_action = call_encode; clnt->cl_stats->rpcretrans++; } else { task->tk_action = call_transmit; clnt->cl_stats->rpcretrans++; } break; case -ECONNREFUSED: case -ENOTCONN: if (clnt->cl_autobind || !clnt->cl_port) { clnt->cl_port = 0; task->tk_action = call_bind; } else if (xprt->stream) task->tk_action = call_reconnect; else { rpc_delay(task, 5*HZ); /* Hope it all wears off */ if (req->rq_damaged) task->tk_action = call_encode; else task->tk_action = call_transmit; clnt->cl_stats->rpcretrans++; } break; default: if (clnt->cl_chatty) printk("%s: RPC call returned error %d\n", clnt->cl_protname, -status); rpc_exit(task, status); } } /* * 6a. Handle RPC timeout * We do not release the request slot, so we keep using the * same XID for all retransmits. */ static void call_timeout(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; struct rpc_rqst *req = task->tk_rqstp; if (req) { struct rpc_timeout *to = &req->rq_timeout; if (xprt_adjust_timeout(to)) { dprintk("RPC: %4d call_timeout (minor timeo)\n", task->tk_pid); goto minor_timeout; } to->to_initval <<= 1; if (to->to_initval > to->to_maxval) to->to_initval = to->to_maxval; } dprintk("RPC: %4d call_timeout (major timeo)\n", task->tk_pid); if (clnt->cl_softrtry) { if (clnt->cl_chatty && !task->tk_exit) printk("%s: server %s not responding, timed out\n", clnt->cl_protname, clnt->cl_server); rpc_exit(task, -EIO); return; } if (clnt->cl_chatty && !(task->tk_flags & RPC_CALL_MAJORSEEN)) { task->tk_flags |= RPC_CALL_MAJORSEEN; if (req) printk("%s: server %s not responding, still trying\n", clnt->cl_protname, clnt->cl_server); else printk("%s: task %d can't get a request slot\n", clnt->cl_protname, task->tk_pid); } if (clnt->cl_autobind) clnt->cl_port = 0; minor_timeout: if (!clnt->cl_port) { task->tk_action = call_bind; } else if (clnt->cl_xprt->stream && !clnt->cl_xprt->connected) { task->tk_action = call_reconnect; } else if (!req) { task->tk_action = call_reserve; } else if (req->rq_damaged) { task->tk_action = call_encode; clnt->cl_stats->rpcretrans++; } else { task->tk_action = call_transmit; clnt->cl_stats->rpcretrans++; } task->tk_status = 0; } /* * 6b. Reconnect to the RPC server (TCP case) */ static void call_reconnect(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; dprintk("RPC: %4d call_reconnect status %d\n", task->tk_pid, task->tk_status); task->tk_action = call_reserve; task->tk_status = 0; clnt->cl_stats->netreconn++; xprt_reconnect(task); } /* * 7. Decode the RPC reply */ static void call_decode(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; struct rpc_rqst *req = task->tk_rqstp; kxdrproc_t decode = rpcproc_decode(clnt, task->tk_proc); u32 *p; dprintk("RPC: %4d call_decode (status %d)\n", task->tk_pid, task->tk_status); if (clnt->cl_chatty && (task->tk_flags & RPC_CALL_MAJORSEEN)) { printk("%s: server %s OK\n", clnt->cl_protname, clnt->cl_server); task->tk_flags &= ~RPC_CALL_MAJORSEEN; } if (task->tk_status < 12) { printk("%s: too small RPC reply size (%d bytes)\n", clnt->cl_protname, task->tk_status); rpc_exit(task, -EIO); return; } /* Verify the RPC header */ if (!(p = call_verify(task))) return; /* * The following is an NFS-specific hack to cater for setuid * processes whose uid is mapped to nobody on the server. */ if (task->tk_client->cl_prog == 100003 && (ntohl(*p) == NFSERR_ACCES || ntohl(*p) == NFSERR_PERM)) { if (RPC_IS_SETUID(task) && (task->tk_suid_retry)--) { dprintk("RPC: %4d retry squashed uid\n", task->tk_pid); task->tk_flags ^= RPC_CALL_REALUID; task->tk_action = call_encode; return; } } task->tk_action = NULL; if (decode) task->tk_status = decode(req, p, task->tk_resp); dprintk("RPC: %4d call_decode result %d\n", task->tk_pid, task->tk_status); } /* * 8. Refresh the credentials if rejected by the server */ static void call_refresh(struct rpc_task *task) { dprintk("RPC: %4d call_refresh\n", task->tk_pid); xprt_release(task); /* Must do to obtain new XID */ task->tk_action = call_refreshresult; task->tk_status = 0; task->tk_client->cl_stats->rpcauthrefresh++; rpcauth_refreshcred(task); } /* * 8a. Process the results of a credential refresh */ static void call_refreshresult(struct rpc_task *task) { dprintk("RPC: %4d call_refreshresult (status %d)\n", task->tk_pid, task->tk_status); if (task->tk_status < 0) rpc_exit(task, -EACCES); else task->tk_action = call_bind; } /* * Call header serialization */ static u32 * call_header(struct rpc_task *task) { struct rpc_clnt *clnt = task->tk_client; struct rpc_xprt *xprt = clnt->cl_xprt; u32 *p = task->tk_buffer; /* FIXME: check buffer size? */ if (xprt->stream) *p++ = 0; /* fill in later */ *p++ = task->tk_rqstp->rq_xid; /* XID */ *p++ = htonl(RPC_CALL); /* CALL */ *p++ = htonl(RPC_VERSION); /* RPC version */ *p++ = htonl(clnt->cl_prog); /* program number */ *p++ = htonl(clnt->cl_vers); /* program version */ *p++ = htonl(task->tk_proc); /* procedure */ return rpcauth_marshcred(task, p); } /* * Reply header verification */ static u32 * call_verify(struct rpc_task *task) { u32 *p = task->tk_buffer, n; p += 1; /* skip XID */ if ((n = ntohl(*p++)) != RPC_REPLY) { printk("call_verify: not an RPC reply: %x\n", n); goto garbage; } if ((n = ntohl(*p++)) != RPC_MSG_ACCEPTED) { int error = -EACCES; if ((n = ntohl(*p++)) != RPC_AUTH_ERROR) { printk("call_verify: RPC call rejected: %x\n", n); } else switch ((n = ntohl(*p++))) { case RPC_AUTH_REJECTEDCRED: case RPC_AUTH_REJECTEDVERF: if (!task->tk_cred_retry--) break; dprintk("RPC: %4d call_verify: retry stale creds\n", task->tk_pid); rpcauth_invalcred(task); task->tk_action = call_refresh; return NULL; case RPC_AUTH_BADCRED: case RPC_AUTH_BADVERF: /* possibly garbled cred/verf? */ if (!task->tk_garb_retry--) break; dprintk("RPC: %4d call_verify: retry garbled creds\n", task->tk_pid); task->tk_action = call_encode; return NULL; case RPC_AUTH_TOOWEAK: printk("call_verify: server requires stronger " "authentication.\n"); default: printk("call_verify: unknown auth error: %x\n", n); error = -EIO; } dprintk("RPC: %4d call_verify: call rejected %d\n", task->tk_pid, n); rpc_exit(task, error); return NULL; } if (!(p = rpcauth_checkverf(task, p))) { printk("call_verify: auth check failed\n"); goto garbage; /* bad verifier, retry */ } switch ((n = ntohl(*p++))) { case RPC_SUCCESS: return p; case RPC_GARBAGE_ARGS: break; /* retry */ default: printk("call_verify: server accept status: %x\n", n); /* Also retry */ } garbage: dprintk("RPC: %4d call_verify: server saw garbage\n", task->tk_pid); task->tk_client->cl_stats->rpcgarbage++; if (task->tk_garb_retry--) { printk("RPC: garbage, retrying %4d\n", task->tk_pid); task->tk_action = call_encode; return NULL; } printk("RPC: garbage, exit EIO\n"); rpc_exit(task, -EIO); return NULL; } |