1 /*- 2 * Copyright (c) 2000-2001 Boris Popov 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/condvar.h> 32 #include <sys/kernel.h> 33 #include <sys/lock.h> 34 #include <sys/malloc.h> 35 #include <sys/mbuf.h> 36 #include <sys/poll.h> 37 #include <sys/proc.h> 38 #include <sys/protosw.h> 39 #include <sys/signalvar.h> 40 #include <sys/socket.h> 41 #include <sys/socketvar.h> 42 #include <sys/sx.h> 43 #include <sys/sysctl.h> 44 #include <sys/systm.h> 45 #include <sys/uio.h> 46 47 #include <net/if.h> 48 #include <net/route.h> 49 50 #include <netinet/in.h> 51 #include <netinet/tcp.h> 52 53 #include <sys/mchain.h> 54 55 #include <netsmb/netbios.h> 56 57 #include <netsmb/smb.h> 58 #include <netsmb/smb_conn.h> 59 #include <netsmb/smb_tran.h> 60 #include <netsmb/smb_trantcp.h> 61 #include <netsmb/smb_subr.h> 62 63 #define M_NBDATA M_PCB 64 65 static int smb_tcpsndbuf = NB_SNDQ - 1; 66 static int smb_tcprcvbuf = NB_RCVQ - 1; 67 68 SYSCTL_DECL(_net_smb); 69 SYSCTL_INT(_net_smb, OID_AUTO, tcpsndbuf, CTLFLAG_RW, &smb_tcpsndbuf, 0, ""); 70 SYSCTL_INT(_net_smb, OID_AUTO, tcprcvbuf, CTLFLAG_RW, &smb_tcprcvbuf, 0, ""); 71 72 #define nb_sosend(so,m,flags,td) sosend(so, NULL, 0, m, 0, flags, td) 73 74 static int nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp, 75 u_int8_t *rpcodep, struct thread *td); 76 static int smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td); 77 78 static int 79 nb_setsockopt_int(struct socket *so, int level, int name, int val) 80 { 81 struct sockopt sopt; 82 83 bzero(&sopt, sizeof(sopt)); 84 sopt.sopt_level = level; 85 sopt.sopt_name = name; 86 sopt.sopt_val = &val; 87 sopt.sopt_valsize = sizeof(val); 88 return sosetopt(so, &sopt); 89 } 90 91 static int 92 nb_intr(struct nbpcb *nbp, struct proc *p) 93 { 94 return 0; 95 } 96 97 static int 98 nb_upcall(struct socket *so, void *arg, int waitflag) 99 { 100 struct nbpcb *nbp = arg; 101 102 if (arg == NULL || nbp->nbp_selectid == NULL) 103 return (SU_OK); 104 wakeup(nbp->nbp_selectid); 105 return (SU_OK); 106 } 107 108 static int 109 nb_sethdr(struct mbuf *m, u_int8_t type, u_int32_t len) 110 { 111 u_int32_t *p = mtod(m, u_int32_t *); 112 113 *p = htonl((len & 0x1FFFF) | (type << 24)); 114 return 0; 115 } 116 117 static int 118 nb_put_name(struct mbchain *mbp, struct sockaddr_nb *snb) 119 { 120 int error; 121 u_char seglen, *cp; 122 123 cp = snb->snb_name; 124 if (*cp == 0) 125 return EINVAL; 126 NBDEBUG("[%s]\n", cp); 127 for (;;) { 128 seglen = (*cp) + 1; 129 error = mb_put_mem(mbp, cp, seglen, MB_MSYSTEM); 130 if (error) 131 return error; 132 if (seglen == 1) 133 break; 134 cp += seglen; 135 } 136 return 0; 137 } 138 139 static int 140 nb_connect_in(struct nbpcb *nbp, struct sockaddr_in *to, struct thread *td) 141 { 142 struct socket *so; 143 int error, s; 144 145 error = socreate(AF_INET, &so, SOCK_STREAM, IPPROTO_TCP, 146 td->td_ucred, td); 147 if (error) 148 return error; 149 nbp->nbp_tso = so; 150 SOCKBUF_LOCK(&so->so_rcv); 151 soupcall_set(so, SO_RCV, nb_upcall, nbp); 152 SOCKBUF_UNLOCK(&so->so_rcv); 153 so->so_rcv.sb_timeo = (5 * hz); 154 so->so_snd.sb_timeo = (5 * hz); 155 error = soreserve(so, nbp->nbp_sndbuf, nbp->nbp_rcvbuf); 156 if (error) 157 goto bad; 158 nb_setsockopt_int(so, SOL_SOCKET, SO_KEEPALIVE, 1); 159 nb_setsockopt_int(so, IPPROTO_TCP, TCP_NODELAY, 1); 160 SOCKBUF_LOCK(&so->so_rcv); 161 so->so_rcv.sb_flags &= ~SB_NOINTR; 162 SOCKBUF_UNLOCK(&so->so_rcv); 163 SOCKBUF_LOCK(&so->so_snd); 164 so->so_snd.sb_flags &= ~SB_NOINTR; 165 SOCKBUF_UNLOCK(&so->so_snd); 166 error = soconnect(so, (struct sockaddr*)to, td); 167 if (error) 168 goto bad; 169 s = splnet(); 170 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 171 tsleep(&so->so_timeo, PSOCK, "nbcon", 2 * hz); 172 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0 && 173 (error = nb_intr(nbp, td->td_proc)) != 0) { 174 so->so_state &= ~SS_ISCONNECTING; 175 splx(s); 176 goto bad; 177 } 178 } 179 if (so->so_error) { 180 error = so->so_error; 181 so->so_error = 0; 182 splx(s); 183 goto bad; 184 } 185 splx(s); 186 return 0; 187 bad: 188 smb_nbst_disconnect(nbp->nbp_vc, td); 189 return error; 190 } 191 192 static int 193 nbssn_rq_request(struct nbpcb *nbp, struct thread *td) 194 { 195 struct mbchain *mbp; 196 struct mdchain *mdp; 197 struct mbuf *m0; 198 struct timeval tv; 199 struct sockaddr_in sin; 200 u_short port; 201 u_int8_t rpcode; 202 int error, rplen; 203 204 mbp = malloc(sizeof(struct mbchain), M_NBDATA, M_WAITOK); 205 mdp = malloc(sizeof(struct mbchain), M_NBDATA, M_WAITOK); 206 error = mb_init(mbp); 207 if (error) { 208 free(mbp, M_NBDATA); 209 free(mdp, M_NBDATA); 210 return error; 211 } 212 mb_put_uint32le(mbp, 0); 213 nb_put_name(mbp, nbp->nbp_paddr); 214 nb_put_name(mbp, nbp->nbp_laddr); 215 nb_sethdr(mbp->mb_top, NB_SSN_REQUEST, mb_fixhdr(mbp) - 4); 216 error = nb_sosend(nbp->nbp_tso, mbp->mb_top, 0, td); 217 if (!error) { 218 nbp->nbp_state = NBST_RQSENT; 219 } 220 mb_detach(mbp); 221 mb_done(mbp); 222 free(mbp, M_NBDATA); 223 if (error) { 224 free(mdp, M_NBDATA); 225 return error; 226 } 227 TIMESPEC_TO_TIMEVAL(&tv, &nbp->nbp_timo); 228 error = selsocket(nbp->nbp_tso, POLLIN, &tv, td); 229 if (error == EWOULDBLOCK) { /* Timeout */ 230 NBDEBUG("initial request timeout\n"); 231 free(mdp, M_NBDATA); 232 return ETIMEDOUT; 233 } 234 if (error) { /* restart or interrupt */ 235 free(mdp, M_NBDATA); 236 return error; 237 } 238 error = nbssn_recv(nbp, &m0, &rplen, &rpcode, td); 239 if (error) { 240 NBDEBUG("recv() error %d\n", error); 241 free(mdp, M_NBDATA); 242 return error; 243 } 244 /* 245 * Process NETBIOS reply 246 */ 247 if (m0) 248 md_initm(mdp, m0); 249 error = 0; 250 do { 251 if (rpcode == NB_SSN_POSRESP) { 252 nbp->nbp_state = NBST_SESSION; 253 nbp->nbp_flags |= NBF_CONNECTED; 254 break; 255 } 256 if (rpcode != NB_SSN_RTGRESP) { 257 error = ECONNABORTED; 258 break; 259 } 260 if (rplen != 6) { 261 error = ECONNABORTED; 262 break; 263 } 264 md_get_mem(mdp, (caddr_t)&sin.sin_addr, 4, MB_MSYSTEM); 265 md_get_uint16(mdp, &port); 266 sin.sin_port = port; 267 nbp->nbp_state = NBST_RETARGET; 268 smb_nbst_disconnect(nbp->nbp_vc, td); 269 error = nb_connect_in(nbp, &sin, td); 270 if (!error) 271 error = nbssn_rq_request(nbp, td); 272 if (error) { 273 smb_nbst_disconnect(nbp->nbp_vc, td); 274 break; 275 } 276 } while(0); 277 if (m0) 278 md_done(mdp); 279 free(mdp, M_NBDATA); 280 return error; 281 } 282 283 static int 284 nbssn_recvhdr(struct nbpcb *nbp, int *lenp, 285 u_int8_t *rpcodep, int flags, struct thread *td) 286 { 287 struct socket *so = nbp->nbp_tso; 288 struct uio auio; 289 struct iovec aio; 290 u_int32_t len; 291 int error; 292 293 aio.iov_base = (caddr_t)&len; 294 aio.iov_len = sizeof(len); 295 auio.uio_iov = &aio; 296 auio.uio_iovcnt = 1; 297 auio.uio_segflg = UIO_SYSSPACE; 298 auio.uio_rw = UIO_READ; 299 auio.uio_offset = 0; 300 auio.uio_resid = sizeof(len); 301 auio.uio_td = td; 302 error = soreceive(so, (struct sockaddr **)NULL, &auio, 303 (struct mbuf **)NULL, (struct mbuf **)NULL, &flags); 304 if (error) 305 return error; 306 if (auio.uio_resid > 0) { 307 SMBSDEBUG("short reply\n"); 308 return EPIPE; 309 } 310 len = ntohl(len); 311 *rpcodep = (len >> 24) & 0xFF; 312 len &= 0x1ffff; 313 if (len > SMB_MAXPKTLEN) { 314 SMBERROR("packet too long (%d)\n", len); 315 return EFBIG; 316 } 317 *lenp = len; 318 return 0; 319 } 320 321 static int 322 nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp, 323 u_int8_t *rpcodep, struct thread *td) 324 { 325 struct socket *so = nbp->nbp_tso; 326 struct uio auio; 327 struct mbuf *m, *tm, *im; 328 u_int8_t rpcode; 329 int len, resid; 330 int error, rcvflg; 331 332 if (so == NULL) 333 return ENOTCONN; 334 335 if (mpp) 336 *mpp = NULL; 337 m = NULL; 338 for(;;) { 339 /* 340 * Poll for a response header. 341 * If we don't have one waiting, return. 342 */ 343 len = 0; 344 rpcode = 0; 345 error = nbssn_recvhdr(nbp, &len, &rpcode, MSG_DONTWAIT, td); 346 if ((so->so_state & (SS_ISDISCONNECTING | SS_ISDISCONNECTED)) || 347 (so->so_rcv.sb_state & SBS_CANTRCVMORE)) { 348 nbp->nbp_state = NBST_CLOSED; 349 NBDEBUG("session closed by peer\n"); 350 return ECONNRESET; 351 } 352 if (error) 353 return error; 354 if (len == 0 && nbp->nbp_state != NBST_SESSION) 355 break; 356 /* no data, try again */ 357 if (rpcode == NB_SSN_KEEPALIVE) 358 continue; 359 360 /* 361 * Loop, blocking, for data following the response header. 362 * 363 * Note that we can't simply block here with MSG_WAITALL for the 364 * entire response size, as it may be larger than the TCP 365 * slow-start window that the sender employs. This will result 366 * in the sender stalling until the delayed ACK is sent, then 367 * resuming slow-start, resulting in very poor performance. 368 * 369 * Instead, we never request more than NB_SORECEIVE_CHUNK 370 * bytes at a time, resulting in an ack being pushed by 371 * the TCP code at the completion of each call. 372 */ 373 resid = len; 374 while (resid > 0) { 375 tm = NULL; 376 rcvflg = MSG_WAITALL; 377 bzero(&auio, sizeof(auio)); 378 auio.uio_resid = min(resid, NB_SORECEIVE_CHUNK); 379 auio.uio_td = td; 380 resid -= auio.uio_resid; 381 /* 382 * Spin until we have collected everything in 383 * this chunk. 384 */ 385 do { 386 rcvflg = MSG_WAITALL; 387 error = soreceive(so, (struct sockaddr **)NULL, 388 &auio, &tm, (struct mbuf **)NULL, &rcvflg); 389 } while (error == EWOULDBLOCK || error == EINTR || 390 error == ERESTART); 391 if (error) 392 goto out; 393 /* short return guarantees unhappiness */ 394 if (auio.uio_resid > 0) { 395 SMBERROR("packet is shorter than expected\n"); 396 error = EPIPE; 397 goto out; 398 } 399 /* append received chunk to previous chunk(s) */ 400 if (m == NULL) { 401 m = tm; 402 } else { 403 /* 404 * Just glue the new chain on the end. 405 * Consumer will pullup as required. 406 */ 407 for (im = m; im->m_next != NULL; im = im->m_next) 408 ; 409 im->m_next = tm; 410 } 411 } 412 /* got a session/message packet? */ 413 if (nbp->nbp_state == NBST_SESSION && 414 rpcode == NB_SSN_MESSAGE) 415 break; 416 /* drop packet and try for another */ 417 NBDEBUG("non-session packet %x\n", rpcode); 418 if (m) { 419 m_freem(m); 420 m = NULL; 421 } 422 } 423 424 out: 425 if (error) { 426 if (m) 427 m_freem(m); 428 return error; 429 } 430 if (mpp) 431 *mpp = m; 432 else 433 m_freem(m); 434 *lenp = len; 435 *rpcodep = rpcode; 436 return 0; 437 } 438 439 /* 440 * SMB transport interface 441 */ 442 static int 443 smb_nbst_create(struct smb_vc *vcp, struct thread *td) 444 { 445 struct nbpcb *nbp; 446 447 nbp = malloc(sizeof *nbp, M_NBDATA, M_WAITOK); 448 bzero(nbp, sizeof *nbp); 449 nbp->nbp_timo.tv_sec = 15; /* XXX: sysctl ? */ 450 nbp->nbp_state = NBST_CLOSED; 451 nbp->nbp_vc = vcp; 452 nbp->nbp_sndbuf = smb_tcpsndbuf; 453 nbp->nbp_rcvbuf = smb_tcprcvbuf; 454 vcp->vc_tdata = nbp; 455 return 0; 456 } 457 458 static int 459 smb_nbst_done(struct smb_vc *vcp, struct thread *td) 460 { 461 struct nbpcb *nbp = vcp->vc_tdata; 462 463 if (nbp == NULL) 464 return ENOTCONN; 465 smb_nbst_disconnect(vcp, td); 466 if (nbp->nbp_laddr) 467 free(nbp->nbp_laddr, M_SONAME); 468 if (nbp->nbp_paddr) 469 free(nbp->nbp_paddr, M_SONAME); 470 free(nbp, M_NBDATA); 471 return 0; 472 } 473 474 static int 475 smb_nbst_bind(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td) 476 { 477 struct nbpcb *nbp = vcp->vc_tdata; 478 struct sockaddr_nb *snb; 479 int error, slen; 480 481 NBDEBUG("\n"); 482 error = EINVAL; 483 do { 484 if (nbp->nbp_flags & NBF_LOCADDR) 485 break; 486 /* 487 * It is possible to create NETBIOS name in the kernel, 488 * but nothing prevents us to do it in the user space. 489 */ 490 if (sap == NULL) 491 break; 492 slen = sap->sa_len; 493 if (slen < NB_MINSALEN) 494 break; 495 snb = (struct sockaddr_nb*)sodupsockaddr(sap, M_WAITOK); 496 if (snb == NULL) { 497 error = ENOMEM; 498 break; 499 } 500 nbp->nbp_laddr = snb; 501 nbp->nbp_flags |= NBF_LOCADDR; 502 error = 0; 503 } while(0); 504 return error; 505 } 506 507 static int 508 smb_nbst_connect(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td) 509 { 510 struct nbpcb *nbp = vcp->vc_tdata; 511 struct sockaddr_in sin; 512 struct sockaddr_nb *snb; 513 struct timespec ts1, ts2; 514 int error, slen; 515 516 NBDEBUG("\n"); 517 if (nbp->nbp_tso != NULL) 518 return EISCONN; 519 if (nbp->nbp_laddr == NULL) 520 return EINVAL; 521 slen = sap->sa_len; 522 if (slen < NB_MINSALEN) 523 return EINVAL; 524 if (nbp->nbp_paddr) { 525 free(nbp->nbp_paddr, M_SONAME); 526 nbp->nbp_paddr = NULL; 527 } 528 snb = (struct sockaddr_nb*)sodupsockaddr(sap, M_WAITOK); 529 if (snb == NULL) 530 return ENOMEM; 531 nbp->nbp_paddr = snb; 532 sin = snb->snb_addrin; 533 getnanotime(&ts1); 534 error = nb_connect_in(nbp, &sin, td); 535 if (error) 536 return error; 537 getnanotime(&ts2); 538 timespecsub(&ts2, &ts1); 539 if (ts2.tv_sec == 0) { 540 ts2.tv_sec = 1; 541 ts2.tv_nsec = 0; 542 } 543 nbp->nbp_timo = ts2; 544 timespecadd(&nbp->nbp_timo, &ts2); 545 timespecadd(&nbp->nbp_timo, &ts2); 546 timespecadd(&nbp->nbp_timo, &ts2); /* * 4 */ 547 error = nbssn_rq_request(nbp, td); 548 if (error) 549 smb_nbst_disconnect(vcp, td); 550 return error; 551 } 552 553 static int 554 smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td) 555 { 556 struct nbpcb *nbp = vcp->vc_tdata; 557 struct socket *so; 558 559 if (nbp == NULL || nbp->nbp_tso == NULL) 560 return ENOTCONN; 561 if ((so = nbp->nbp_tso) != NULL) { 562 nbp->nbp_flags &= ~NBF_CONNECTED; 563 nbp->nbp_tso = (struct socket *)NULL; 564 soshutdown(so, 2); 565 soclose(so); 566 } 567 if (nbp->nbp_state != NBST_RETARGET) { 568 nbp->nbp_state = NBST_CLOSED; 569 } 570 return 0; 571 } 572 573 static int 574 smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct thread *td) 575 { 576 struct nbpcb *nbp = vcp->vc_tdata; 577 int error; 578 579 if (nbp->nbp_state != NBST_SESSION) { 580 error = ENOTCONN; 581 goto abort; 582 } 583 M_PREPEND(m0, 4, M_WAITOK); 584 nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4); 585 error = nb_sosend(nbp->nbp_tso, m0, 0, td); 586 return error; 587 abort: 588 if (m0) 589 m_freem(m0); 590 return error; 591 } 592 593 594 static int 595 smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct thread *td) 596 { 597 struct nbpcb *nbp = vcp->vc_tdata; 598 u_int8_t rpcode; 599 int error, rplen; 600 601 nbp->nbp_flags |= NBF_RECVLOCK; 602 error = nbssn_recv(nbp, mpp, &rplen, &rpcode, td); 603 nbp->nbp_flags &= ~NBF_RECVLOCK; 604 return error; 605 } 606 607 static void 608 smb_nbst_timo(struct smb_vc *vcp) 609 { 610 return; 611 } 612 613 static void 614 smb_nbst_intr(struct smb_vc *vcp) 615 { 616 struct nbpcb *nbp = vcp->vc_tdata; 617 618 if (nbp == NULL || nbp->nbp_tso == NULL) 619 return; 620 sorwakeup(nbp->nbp_tso); 621 sowwakeup(nbp->nbp_tso); 622 } 623 624 static int 625 smb_nbst_getparam(struct smb_vc *vcp, int param, void *data) 626 { 627 struct nbpcb *nbp = vcp->vc_tdata; 628 629 switch (param) { 630 case SMBTP_SNDSZ: 631 *(int*)data = nbp->nbp_sndbuf; 632 break; 633 case SMBTP_RCVSZ: 634 *(int*)data = nbp->nbp_rcvbuf; 635 break; 636 case SMBTP_TIMEOUT: 637 *(struct timespec*)data = nbp->nbp_timo; 638 break; 639 default: 640 return EINVAL; 641 } 642 return 0; 643 } 644 645 static int 646 smb_nbst_setparam(struct smb_vc *vcp, int param, void *data) 647 { 648 struct nbpcb *nbp = vcp->vc_tdata; 649 650 switch (param) { 651 case SMBTP_SELECTID: 652 nbp->nbp_selectid = data; 653 break; 654 default: 655 return EINVAL; 656 } 657 return 0; 658 } 659 660 /* 661 * Check for fatal errors 662 */ 663 static int 664 smb_nbst_fatal(struct smb_vc *vcp, int error) 665 { 666 switch (error) { 667 case ENOTCONN: 668 case ENETRESET: 669 case ECONNABORTED: 670 return 1; 671 } 672 return 0; 673 } 674 675 676 struct smb_tran_desc smb_tran_nbtcp_desc = { 677 SMBT_NBTCP, 678 smb_nbst_create, smb_nbst_done, 679 smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect, 680 smb_nbst_send, smb_nbst_recv, 681 smb_nbst_timo, smb_nbst_intr, 682 smb_nbst_getparam, smb_nbst_setparam, 683 smb_nbst_fatal 684 }; 685 686