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 mb, *mbp = &mb; 196 struct mdchain md, *mdp = &md; 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 error = mb_init(mbp); 205 if (error) 206 return error; 207 mb_put_uint32le(mbp, 0); 208 nb_put_name(mbp, nbp->nbp_paddr); 209 nb_put_name(mbp, nbp->nbp_laddr); 210 nb_sethdr(mbp->mb_top, NB_SSN_REQUEST, mb_fixhdr(mbp) - 4); 211 error = nb_sosend(nbp->nbp_tso, mbp->mb_top, 0, td); 212 if (!error) { 213 nbp->nbp_state = NBST_RQSENT; 214 } 215 mb_detach(mbp); 216 mb_done(mbp); 217 if (error) 218 return error; 219 TIMESPEC_TO_TIMEVAL(&tv, &nbp->nbp_timo); 220 error = selsocket(nbp->nbp_tso, POLLIN, &tv, td); 221 if (error == EWOULDBLOCK) { /* Timeout */ 222 NBDEBUG("initial request timeout\n"); 223 return ETIMEDOUT; 224 } 225 if (error) /* restart or interrupt */ 226 return error; 227 error = nbssn_recv(nbp, &m0, &rplen, &rpcode, td); 228 if (error) { 229 NBDEBUG("recv() error %d\n", error); 230 return error; 231 } 232 /* 233 * Process NETBIOS reply 234 */ 235 if (m0) 236 md_initm(mdp, m0); 237 error = 0; 238 do { 239 if (rpcode == NB_SSN_POSRESP) { 240 nbp->nbp_state = NBST_SESSION; 241 nbp->nbp_flags |= NBF_CONNECTED; 242 break; 243 } 244 if (rpcode != NB_SSN_RTGRESP) { 245 error = ECONNABORTED; 246 break; 247 } 248 if (rplen != 6) { 249 error = ECONNABORTED; 250 break; 251 } 252 md_get_mem(mdp, (caddr_t)&sin.sin_addr, 4, MB_MSYSTEM); 253 md_get_uint16(mdp, &port); 254 sin.sin_port = port; 255 nbp->nbp_state = NBST_RETARGET; 256 smb_nbst_disconnect(nbp->nbp_vc, td); 257 error = nb_connect_in(nbp, &sin, td); 258 if (!error) 259 error = nbssn_rq_request(nbp, td); 260 if (error) { 261 smb_nbst_disconnect(nbp->nbp_vc, td); 262 break; 263 } 264 } while(0); 265 if (m0) 266 md_done(mdp); 267 return error; 268 } 269 270 static int 271 nbssn_recvhdr(struct nbpcb *nbp, int *lenp, 272 u_int8_t *rpcodep, int flags, struct thread *td) 273 { 274 struct socket *so = nbp->nbp_tso; 275 struct uio auio; 276 struct iovec aio; 277 u_int32_t len; 278 int error; 279 280 aio.iov_base = (caddr_t)&len; 281 aio.iov_len = sizeof(len); 282 auio.uio_iov = &aio; 283 auio.uio_iovcnt = 1; 284 auio.uio_segflg = UIO_SYSSPACE; 285 auio.uio_rw = UIO_READ; 286 auio.uio_offset = 0; 287 auio.uio_resid = sizeof(len); 288 auio.uio_td = td; 289 error = soreceive(so, (struct sockaddr **)NULL, &auio, 290 (struct mbuf **)NULL, (struct mbuf **)NULL, &flags); 291 if (error) 292 return error; 293 if (auio.uio_resid > 0) { 294 SMBSDEBUG("short reply\n"); 295 return EPIPE; 296 } 297 len = ntohl(len); 298 *rpcodep = (len >> 24) & 0xFF; 299 len &= 0x1ffff; 300 if (len > SMB_MAXPKTLEN) { 301 SMBERROR("packet too long (%d)\n", len); 302 return EFBIG; 303 } 304 *lenp = len; 305 return 0; 306 } 307 308 static int 309 nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp, 310 u_int8_t *rpcodep, struct thread *td) 311 { 312 struct socket *so = nbp->nbp_tso; 313 struct uio auio; 314 struct mbuf *m, *tm, *im; 315 u_int8_t rpcode; 316 int len, resid; 317 int error, rcvflg; 318 319 if (so == NULL) 320 return ENOTCONN; 321 322 if (mpp) 323 *mpp = NULL; 324 m = NULL; 325 for(;;) { 326 /* 327 * Poll for a response header. 328 * If we don't have one waiting, return. 329 */ 330 len = 0; 331 rpcode = 0; 332 error = nbssn_recvhdr(nbp, &len, &rpcode, MSG_DONTWAIT, td); 333 if ((so->so_state & (SS_ISDISCONNECTING | SS_ISDISCONNECTED)) || 334 (so->so_rcv.sb_state & SBS_CANTRCVMORE)) { 335 nbp->nbp_state = NBST_CLOSED; 336 NBDEBUG("session closed by peer\n"); 337 return ECONNRESET; 338 } 339 if (error) 340 return error; 341 if (len == 0 && nbp->nbp_state != NBST_SESSION) 342 break; 343 /* no data, try again */ 344 if (rpcode == NB_SSN_KEEPALIVE) 345 continue; 346 347 /* 348 * Loop, blocking, for data following the response header. 349 * 350 * Note that we can't simply block here with MSG_WAITALL for the 351 * entire response size, as it may be larger than the TCP 352 * slow-start window that the sender employs. This will result 353 * in the sender stalling until the delayed ACK is sent, then 354 * resuming slow-start, resulting in very poor performance. 355 * 356 * Instead, we never request more than NB_SORECEIVE_CHUNK 357 * bytes at a time, resulting in an ack being pushed by 358 * the TCP code at the completion of each call. 359 */ 360 resid = len; 361 while (resid > 0) { 362 tm = NULL; 363 rcvflg = MSG_WAITALL; 364 bzero(&auio, sizeof(auio)); 365 auio.uio_resid = min(resid, NB_SORECEIVE_CHUNK); 366 auio.uio_td = td; 367 resid -= auio.uio_resid; 368 /* 369 * Spin until we have collected everything in 370 * this chunk. 371 */ 372 do { 373 rcvflg = MSG_WAITALL; 374 error = soreceive(so, (struct sockaddr **)NULL, 375 &auio, &tm, (struct mbuf **)NULL, &rcvflg); 376 } while (error == EWOULDBLOCK || error == EINTR || 377 error == ERESTART); 378 if (error) 379 goto out; 380 /* short return guarantees unhappiness */ 381 if (auio.uio_resid > 0) { 382 SMBERROR("packet is shorter than expected\n"); 383 error = EPIPE; 384 goto out; 385 } 386 /* append received chunk to previous chunk(s) */ 387 if (m == NULL) { 388 m = tm; 389 } else { 390 /* 391 * Just glue the new chain on the end. 392 * Consumer will pullup as required. 393 */ 394 for (im = m; im->m_next != NULL; im = im->m_next) 395 ; 396 im->m_next = tm; 397 } 398 } 399 /* got a session/message packet? */ 400 if (nbp->nbp_state == NBST_SESSION && 401 rpcode == NB_SSN_MESSAGE) 402 break; 403 /* drop packet and try for another */ 404 NBDEBUG("non-session packet %x\n", rpcode); 405 if (m) { 406 m_freem(m); 407 m = NULL; 408 } 409 } 410 411 out: 412 if (error) { 413 if (m) 414 m_freem(m); 415 return error; 416 } 417 if (mpp) 418 *mpp = m; 419 else 420 m_freem(m); 421 *lenp = len; 422 *rpcodep = rpcode; 423 return 0; 424 } 425 426 /* 427 * SMB transport interface 428 */ 429 static int 430 smb_nbst_create(struct smb_vc *vcp, struct thread *td) 431 { 432 struct nbpcb *nbp; 433 434 nbp = malloc(sizeof *nbp, M_NBDATA, M_WAITOK); 435 bzero(nbp, sizeof *nbp); 436 nbp->nbp_timo.tv_sec = 15; /* XXX: sysctl ? */ 437 nbp->nbp_state = NBST_CLOSED; 438 nbp->nbp_vc = vcp; 439 nbp->nbp_sndbuf = smb_tcpsndbuf; 440 nbp->nbp_rcvbuf = smb_tcprcvbuf; 441 vcp->vc_tdata = nbp; 442 return 0; 443 } 444 445 static int 446 smb_nbst_done(struct smb_vc *vcp, struct thread *td) 447 { 448 struct nbpcb *nbp = vcp->vc_tdata; 449 450 if (nbp == NULL) 451 return ENOTCONN; 452 smb_nbst_disconnect(vcp, td); 453 if (nbp->nbp_laddr) 454 free(nbp->nbp_laddr, M_SONAME); 455 if (nbp->nbp_paddr) 456 free(nbp->nbp_paddr, M_SONAME); 457 free(nbp, M_NBDATA); 458 return 0; 459 } 460 461 static int 462 smb_nbst_bind(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td) 463 { 464 struct nbpcb *nbp = vcp->vc_tdata; 465 struct sockaddr_nb *snb; 466 int error, slen; 467 468 NBDEBUG("\n"); 469 error = EINVAL; 470 do { 471 if (nbp->nbp_flags & NBF_LOCADDR) 472 break; 473 /* 474 * It is possible to create NETBIOS name in the kernel, 475 * but nothing prevents us to do it in the user space. 476 */ 477 if (sap == NULL) 478 break; 479 slen = sap->sa_len; 480 if (slen < NB_MINSALEN) 481 break; 482 snb = (struct sockaddr_nb*)sodupsockaddr(sap, M_WAITOK); 483 if (snb == NULL) { 484 error = ENOMEM; 485 break; 486 } 487 nbp->nbp_laddr = snb; 488 nbp->nbp_flags |= NBF_LOCADDR; 489 error = 0; 490 } while(0); 491 return error; 492 } 493 494 static int 495 smb_nbst_connect(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td) 496 { 497 struct nbpcb *nbp = vcp->vc_tdata; 498 struct sockaddr_in sin; 499 struct sockaddr_nb *snb; 500 struct timespec ts1, ts2; 501 int error, slen; 502 503 NBDEBUG("\n"); 504 if (nbp->nbp_tso != NULL) 505 return EISCONN; 506 if (nbp->nbp_laddr == NULL) 507 return EINVAL; 508 slen = sap->sa_len; 509 if (slen < NB_MINSALEN) 510 return EINVAL; 511 if (nbp->nbp_paddr) { 512 free(nbp->nbp_paddr, M_SONAME); 513 nbp->nbp_paddr = NULL; 514 } 515 snb = (struct sockaddr_nb*)sodupsockaddr(sap, M_WAITOK); 516 if (snb == NULL) 517 return ENOMEM; 518 nbp->nbp_paddr = snb; 519 sin = snb->snb_addrin; 520 getnanotime(&ts1); 521 error = nb_connect_in(nbp, &sin, td); 522 if (error) 523 return error; 524 getnanotime(&ts2); 525 timespecsub(&ts2, &ts1); 526 if (ts2.tv_sec == 0) { 527 ts2.tv_sec = 1; 528 ts2.tv_nsec = 0; 529 } 530 nbp->nbp_timo = ts2; 531 timespecadd(&nbp->nbp_timo, &ts2); 532 timespecadd(&nbp->nbp_timo, &ts2); 533 timespecadd(&nbp->nbp_timo, &ts2); /* * 4 */ 534 error = nbssn_rq_request(nbp, td); 535 if (error) 536 smb_nbst_disconnect(vcp, td); 537 return error; 538 } 539 540 static int 541 smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td) 542 { 543 struct nbpcb *nbp = vcp->vc_tdata; 544 struct socket *so; 545 546 if (nbp == NULL || nbp->nbp_tso == NULL) 547 return ENOTCONN; 548 if ((so = nbp->nbp_tso) != NULL) { 549 nbp->nbp_flags &= ~NBF_CONNECTED; 550 nbp->nbp_tso = (struct socket *)NULL; 551 soshutdown(so, 2); 552 soclose(so); 553 } 554 if (nbp->nbp_state != NBST_RETARGET) { 555 nbp->nbp_state = NBST_CLOSED; 556 } 557 return 0; 558 } 559 560 static int 561 smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct thread *td) 562 { 563 struct nbpcb *nbp = vcp->vc_tdata; 564 int error; 565 566 if (nbp->nbp_state != NBST_SESSION) { 567 error = ENOTCONN; 568 goto abort; 569 } 570 M_PREPEND(m0, 4, M_WAIT); 571 nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4); 572 error = nb_sosend(nbp->nbp_tso, m0, 0, td); 573 return error; 574 abort: 575 if (m0) 576 m_freem(m0); 577 return error; 578 } 579 580 581 static int 582 smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct thread *td) 583 { 584 struct nbpcb *nbp = vcp->vc_tdata; 585 u_int8_t rpcode; 586 int error, rplen; 587 588 nbp->nbp_flags |= NBF_RECVLOCK; 589 error = nbssn_recv(nbp, mpp, &rplen, &rpcode, td); 590 nbp->nbp_flags &= ~NBF_RECVLOCK; 591 return error; 592 } 593 594 static void 595 smb_nbst_timo(struct smb_vc *vcp) 596 { 597 return; 598 } 599 600 static void 601 smb_nbst_intr(struct smb_vc *vcp) 602 { 603 struct nbpcb *nbp = vcp->vc_tdata; 604 605 if (nbp == NULL || nbp->nbp_tso == NULL) 606 return; 607 sorwakeup(nbp->nbp_tso); 608 sowwakeup(nbp->nbp_tso); 609 } 610 611 static int 612 smb_nbst_getparam(struct smb_vc *vcp, int param, void *data) 613 { 614 struct nbpcb *nbp = vcp->vc_tdata; 615 616 switch (param) { 617 case SMBTP_SNDSZ: 618 *(int*)data = nbp->nbp_sndbuf; 619 break; 620 case SMBTP_RCVSZ: 621 *(int*)data = nbp->nbp_rcvbuf; 622 break; 623 case SMBTP_TIMEOUT: 624 *(struct timespec*)data = nbp->nbp_timo; 625 break; 626 default: 627 return EINVAL; 628 } 629 return 0; 630 } 631 632 static int 633 smb_nbst_setparam(struct smb_vc *vcp, int param, void *data) 634 { 635 struct nbpcb *nbp = vcp->vc_tdata; 636 637 switch (param) { 638 case SMBTP_SELECTID: 639 nbp->nbp_selectid = data; 640 break; 641 default: 642 return EINVAL; 643 } 644 return 0; 645 } 646 647 /* 648 * Check for fatal errors 649 */ 650 static int 651 smb_nbst_fatal(struct smb_vc *vcp, int error) 652 { 653 switch (error) { 654 case ENOTCONN: 655 case ENETRESET: 656 case ECONNABORTED: 657 return 1; 658 } 659 return 0; 660 } 661 662 663 struct smb_tran_desc smb_tran_nbtcp_desc = { 664 SMBT_NBTCP, 665 smb_nbst_create, smb_nbst_done, 666 smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect, 667 smb_nbst_send, smb_nbst_recv, 668 smb_nbst_timo, smb_nbst_intr, 669 smb_nbst_getparam, smb_nbst_setparam, 670 smb_nbst_fatal 671 }; 672 673