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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Boris Popov. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: src/sys/netsmb/smb_trantcp.c,v 1.3.2.1 2001/05/22 08:32:34 bp Exp $ 33 */ 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/malloc.h> 38 #include <sys/mbuf.h> 39 #include <sys/proc.h> 40 #include <sys/protosw.h> 41 #include <sys/resourcevar.h> 42 #include <sys/socket.h> 43 #include <sys/socketvar.h> 44 #include <sys/socketvar2.h> 45 #include <sys/socketops.h> 46 #include <sys/poll.h> 47 #include <sys/uio.h> 48 #include <sys/fcntl.h> 49 #include <sys/sysctl.h> 50 #include <sys/thread2.h> 51 52 #include <net/if.h> 53 #include <net/route.h> 54 55 #include <netinet/in.h> 56 #include <netinet/tcp.h> 57 58 #include <sys/mchain.h> 59 60 #include "netbios.h" 61 62 #include "smb.h" 63 #include "smb_conn.h" 64 #include "smb_tran.h" 65 #include "smb_trantcp.h" 66 #include "smb_subr.h" 67 68 #define M_NBDATA M_PCB 69 70 static int smb_tcpsndbuf = 10 * 1024; 71 static int smb_tcprcvbuf = 10 * 1024; 72 73 SYSCTL_DECL(_net_smb); 74 SYSCTL_INT(_net_smb, OID_AUTO, tcpsndbuf, CTLFLAG_RW, &smb_tcpsndbuf, 0, ""); 75 SYSCTL_INT(_net_smb, OID_AUTO, tcprcvbuf, CTLFLAG_RW, &smb_tcprcvbuf, 0, ""); 76 77 #define nb_sosend(so,m,flags,p) \ 78 so_pru_sosend(so, NULL, NULL, m, NULL, flags, td) 79 80 static int nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp, 81 u_int8_t *rpcodep, struct thread *td); 82 static int smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td); 83 84 static int 85 nb_setsockopt_int(struct socket *so, int level, int name, int val) 86 { 87 struct sockopt sopt; 88 89 bzero(&sopt, sizeof(sopt)); 90 sopt.sopt_level = level; 91 sopt.sopt_name = name; 92 sopt.sopt_val = &val; 93 sopt.sopt_valsize = sizeof(val); 94 return sosetopt(so, &sopt); 95 } 96 97 static int 98 nb_intr(struct nbpcb *nbp, struct thread *td) 99 { 100 return 0; 101 } 102 103 static void 104 nb_upcall(struct socket *so, void *arg, int waitflag) 105 { 106 struct nbpcb *nbp = arg; 107 108 if (arg == NULL || nbp->nbp_selectid == NULL) 109 return; 110 wakeup(nbp->nbp_selectid); 111 } 112 113 static int 114 nb_sethdr(struct mbuf *m, u_int8_t type, u_int32_t len) 115 { 116 u_int32_t *p = mtod(m, u_int32_t *); 117 118 *p = htonl((len & 0x1FFFF) | (type << 24)); 119 return 0; 120 } 121 122 static int 123 nb_put_name(struct mbchain *mbp, struct sockaddr_nb *snb) 124 { 125 int error; 126 u_char seglen, *cp; 127 128 cp = snb->snb_name; 129 if (*cp == 0) 130 return EINVAL; 131 NBDEBUG("[%s]\n", cp); 132 for (;;) { 133 seglen = (*cp) + 1; 134 error = mb_put_mem(mbp, cp, seglen, MB_MSYSTEM); 135 if (error) 136 return error; 137 if (seglen == 1) 138 break; 139 cp += seglen; 140 } 141 return 0; 142 } 143 144 static int 145 nb_connect_in(struct nbpcb *nbp, struct sockaddr_in *to, struct thread *td) 146 { 147 struct socket *so; 148 int error; 149 150 error = socreate(AF_INET, &so, SOCK_STREAM, IPPROTO_TCP, td); 151 if (error) 152 return error; 153 nbp->nbp_tso = so; 154 so->so_upcallarg = (caddr_t)nbp; 155 so->so_upcall = nb_upcall; 156 atomic_set_int(&so->so_rcv.ssb_flags, SSB_UPCALL); 157 so->so_rcv.ssb_timeo = (5 * hz); 158 so->so_snd.ssb_timeo = (5 * hz); 159 error = soreserve(so, nbp->nbp_sndbuf, nbp->nbp_rcvbuf, 160 &td->td_proc->p_rlimit[RLIMIT_SBSIZE]); 161 if (error) 162 goto bad; 163 nb_setsockopt_int(so, SOL_SOCKET, SO_KEEPALIVE, 1); 164 nb_setsockopt_int(so, IPPROTO_TCP, TCP_NODELAY, 1); 165 atomic_clear_int(&so->so_rcv.ssb_flags, SSB_NOINTR); 166 atomic_clear_int(&so->so_snd.ssb_flags, SSB_NOINTR); 167 error = soconnect(so, (struct sockaddr*)to, td, TRUE); 168 169 /* 170 * If signals are allowed nbssn_recv() can wind up in a hard loop 171 * on EWOULDBLOCK. 172 */ 173 atomic_set_int(&so->so_rcv.ssb_flags, SSB_NOINTR); 174 atomic_set_int(&so->so_snd.ssb_flags, SSB_NOINTR); 175 if (error) 176 goto bad; 177 crit_enter(); 178 while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) { 179 tsleep(&so->so_timeo, 0, "nbcon", 2 * hz); 180 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0 && 181 (error = nb_intr(nbp, td)) != 0) { 182 soclrstate(so, SS_ISCONNECTING); 183 crit_exit(); 184 goto bad; 185 } 186 } 187 if (so->so_error) { 188 error = so->so_error; 189 so->so_error = 0; 190 crit_exit(); 191 goto bad; 192 } 193 crit_exit(); 194 return 0; 195 bad: 196 smb_nbst_disconnect(nbp->nbp_vc, td); 197 return error; 198 } 199 200 static int 201 nbssn_rq_request(struct nbpcb *nbp, struct thread *td) 202 { 203 struct mbchain mb, *mbp = &mb; 204 struct mdchain md, *mdp = &md; 205 struct mbuf *m0; 206 struct sockaddr_in sin; 207 u_short port; 208 u_int8_t rpcode; 209 int error, rplen, res; 210 211 error = mb_init(mbp); 212 if (error) 213 return error; 214 mb_put_uint32le(mbp, 0); 215 nb_put_name(mbp, nbp->nbp_paddr); 216 nb_put_name(mbp, nbp->nbp_laddr); 217 nb_sethdr(mbp->mb_top, NB_SSN_REQUEST, mb_fixhdr(mbp) - 4); 218 error = nb_sosend(nbp->nbp_tso, mbp->mb_top, 0, td); 219 if (!error) { 220 nbp->nbp_state = NBST_RQSENT; 221 } 222 mb_detach(mbp); 223 mb_done(mbp); 224 if (error) 225 return error; 226 error = socket_wait(nbp->nbp_tso, &nbp->nbp_timo, &res); 227 if (error == EWOULDBLOCK) { /* Timeout */ 228 NBDEBUG("initial request timeout\n"); 229 return ETIMEDOUT; 230 } 231 if (error) /* restart or interrupt */ 232 return error; 233 error = nbssn_recv(nbp, &m0, &rplen, &rpcode, td); 234 if (error) { 235 NBDEBUG("recv() error %d\n", error); 236 return error; 237 } 238 /* 239 * Process NETBIOS reply 240 */ 241 if (m0) 242 md_initm(mdp, m0); 243 error = 0; 244 do { 245 if (rpcode == NB_SSN_POSRESP) { 246 nbp->nbp_state = NBST_SESSION; 247 nbp->nbp_flags |= NBF_CONNECTED; 248 break; 249 } 250 if (rpcode != NB_SSN_RTGRESP) { 251 error = ECONNABORTED; 252 break; 253 } 254 if (rplen != 6) { 255 error = ECONNABORTED; 256 break; 257 } 258 md_get_mem(mdp, (caddr_t)&sin.sin_addr, 4, MB_MSYSTEM); 259 md_get_uint16(mdp, &port); 260 sin.sin_port = port; 261 nbp->nbp_state = NBST_RETARGET; 262 smb_nbst_disconnect(nbp->nbp_vc, td); 263 error = nb_connect_in(nbp, &sin, td); 264 if (!error) 265 error = nbssn_rq_request(nbp, td); 266 if (error) { 267 smb_nbst_disconnect(nbp->nbp_vc, td); 268 break; 269 } 270 } while(0); 271 if (m0) 272 md_done(mdp); 273 return error; 274 } 275 276 static int 277 nbssn_recvhdr(struct nbpcb *nbp, int *lenp, 278 u_int8_t *rpcodep, int flags, struct thread *td) 279 { 280 struct socket *so = nbp->nbp_tso; 281 struct uio auio; 282 struct iovec aio; 283 u_int32_t len; 284 int error; 285 286 aio.iov_base = (caddr_t)&len; 287 aio.iov_len = sizeof(len); 288 auio.uio_iov = &aio; 289 auio.uio_iovcnt = 1; 290 auio.uio_segflg = UIO_SYSSPACE; 291 auio.uio_rw = UIO_READ; 292 auio.uio_offset = 0; 293 auio.uio_resid = sizeof(len); 294 auio.uio_td = td; 295 error = so_pru_soreceive(so, NULL, &auio, NULL, NULL, &flags); 296 if (error) 297 return error; 298 if (auio.uio_resid > 0) { 299 SMBSDEBUG("short reply\n"); 300 return EPIPE; 301 } 302 len = ntohl(len); 303 *rpcodep = (len >> 24) & 0xFF; 304 len &= 0x1ffff; 305 if (len > SMB_MAXPKTLEN) { 306 SMBERROR("packet too long (%d)\n", len); 307 return EFBIG; 308 } 309 *lenp = len; 310 return 0; 311 } 312 313 static int 314 nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp, 315 u_int8_t *rpcodep, struct thread *td) 316 { 317 struct socket *so = nbp->nbp_tso; 318 struct sockbuf sio; 319 int error, rcvflg; 320 int savelen = 0; 321 u_int8_t rpcode = 0; 322 323 if (so == NULL) 324 return ENOTCONN; 325 326 sbinit(&sio, 0); 327 if (mpp) 328 *mpp = NULL; 329 330 for(;;) { 331 error = nbssn_recvhdr(nbp, &savelen, &rpcode, MSG_DONTWAIT, td); 332 if (so->so_state & 333 (SS_ISDISCONNECTING | SS_ISDISCONNECTED | SS_CANTRCVMORE)) { 334 nbp->nbp_state = NBST_CLOSED; 335 NBDEBUG("session closed by peer\n"); 336 error = ECONNRESET; 337 break; 338 } 339 if (error) 340 break; 341 if (savelen == 0 && nbp->nbp_state != NBST_SESSION) 342 break; 343 if (rpcode == NB_SSN_KEEPALIVE) 344 continue; 345 do { 346 sbinit(&sio, savelen); 347 rcvflg = MSG_WAITALL; 348 error = so_pru_soreceive(so, NULL, NULL, &sio, 349 NULL, &rcvflg); 350 } while (error == EWOULDBLOCK || error == EINTR || 351 error == ERESTART); 352 if (error) 353 break; 354 if (sio.sb_cc != savelen) { 355 SMBERROR("packet is shorter than expected\n"); 356 error = EPIPE; 357 m_freem(sio.sb_mb); 358 break; 359 } 360 if (nbp->nbp_state == NBST_SESSION && rpcode == NB_SSN_MESSAGE) 361 break; 362 NBDEBUG("non-session packet %x\n", rpcode); 363 m_freem(sio.sb_mb); 364 sio.sb_mb = NULL; 365 sio.sb_cc = 0; 366 } 367 if (error == 0) { 368 if (mpp) 369 *mpp = sio.sb_mb; 370 else 371 m_freem(sio.sb_mb); 372 *lenp = sio.sb_cc; 373 *rpcodep = rpcode; 374 } 375 return (error); 376 } 377 378 /* 379 * SMB transport interface 380 */ 381 static int 382 smb_nbst_create(struct smb_vc *vcp, struct thread *td) 383 { 384 struct nbpcb *nbp; 385 386 nbp = kmalloc(sizeof *nbp, M_NBDATA, M_WAITOK | M_ZERO); 387 nbp->nbp_timo.tv_sec = 15; /* XXX: sysctl ? */ 388 nbp->nbp_state = NBST_CLOSED; 389 nbp->nbp_vc = vcp; 390 nbp->nbp_sndbuf = smb_tcpsndbuf; 391 nbp->nbp_rcvbuf = smb_tcprcvbuf; 392 vcp->vc_tdata = nbp; 393 return 0; 394 } 395 396 static int 397 smb_nbst_done(struct smb_vc *vcp, struct thread *td) 398 { 399 struct nbpcb *nbp = vcp->vc_tdata; 400 401 if (nbp == NULL) 402 return ENOTCONN; 403 smb_nbst_disconnect(vcp, td); 404 if (nbp->nbp_laddr) 405 kfree(nbp->nbp_laddr, M_SONAME); 406 if (nbp->nbp_paddr) 407 kfree(nbp->nbp_paddr, M_SONAME); 408 kfree(nbp, M_NBDATA); 409 return 0; 410 } 411 412 static int 413 smb_nbst_bind(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td) 414 { 415 struct nbpcb *nbp = vcp->vc_tdata; 416 struct sockaddr_nb *snb; 417 int error, slen; 418 419 NBDEBUG("\n"); 420 error = EINVAL; 421 do { 422 if (nbp->nbp_flags & NBF_LOCADDR) 423 break; 424 /* 425 * It is possible to create NETBIOS name in the kernel, 426 * but nothing prevents us to do it in the user space. 427 */ 428 if (sap == NULL) 429 break; 430 slen = sap->sa_len; 431 if (slen < NB_MINSALEN) 432 break; 433 snb = (struct sockaddr_nb*)dup_sockaddr(sap); 434 if (snb == NULL) { 435 error = ENOMEM; 436 break; 437 } 438 nbp->nbp_laddr = snb; 439 nbp->nbp_flags |= NBF_LOCADDR; 440 error = 0; 441 } while(0); 442 return error; 443 } 444 445 static int 446 smb_nbst_connect(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td) 447 { 448 struct nbpcb *nbp = vcp->vc_tdata; 449 struct sockaddr_in sin; 450 struct sockaddr_nb *snb; 451 struct timespec ts1, ts2; 452 int error, slen; 453 454 NBDEBUG("\n"); 455 if (nbp->nbp_tso != NULL) 456 return EISCONN; 457 if (nbp->nbp_laddr == NULL) 458 return EINVAL; 459 slen = sap->sa_len; 460 if (slen < NB_MINSALEN) 461 return EINVAL; 462 if (nbp->nbp_paddr) { 463 kfree(nbp->nbp_paddr, M_SONAME); 464 nbp->nbp_paddr = NULL; 465 } 466 snb = (struct sockaddr_nb*)dup_sockaddr(sap); 467 if (snb == NULL) 468 return ENOMEM; 469 nbp->nbp_paddr = snb; 470 sin = snb->snb_addrin; 471 getnanotime(&ts1); 472 error = nb_connect_in(nbp, &sin, td); 473 if (error) 474 return error; 475 getnanotime(&ts2); 476 timespecsub(&ts2, &ts1, &ts2); 477 if (ts2.tv_sec == 0) { 478 ts2.tv_sec = 1; 479 ts2.tv_nsec = 0; 480 } 481 timespecadd(&ts2, &ts2, &nbp->nbp_timo); 482 timespecadd(&nbp->nbp_timo, &ts2, &nbp->nbp_timo); 483 timespecadd(&nbp->nbp_timo, &ts2, &nbp->nbp_timo); /* * 4 */ 484 error = nbssn_rq_request(nbp, td); 485 if (error) 486 smb_nbst_disconnect(vcp, td); 487 return error; 488 } 489 490 static int 491 smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td) 492 { 493 struct nbpcb *nbp = vcp->vc_tdata; 494 struct socket *so; 495 496 if (nbp == NULL || nbp->nbp_tso == NULL) 497 return ENOTCONN; 498 if ((so = nbp->nbp_tso) != NULL) { 499 nbp->nbp_flags &= ~NBF_CONNECTED; 500 nbp->nbp_tso = NULL; 501 soshutdown(so, SHUT_RDWR); 502 soclose(so, FNONBLOCK); 503 } 504 if (nbp->nbp_state != NBST_RETARGET) { 505 nbp->nbp_state = NBST_CLOSED; 506 } 507 return 0; 508 } 509 510 static int 511 smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct thread *td) 512 { 513 struct nbpcb *nbp = vcp->vc_tdata; 514 int error; 515 516 if (nbp->nbp_state != NBST_SESSION) { 517 error = ENOTCONN; 518 goto abort; 519 } 520 M_PREPEND(m0, 4, M_WAITOK); 521 nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4); 522 error = nb_sosend(nbp->nbp_tso, m0, 0, td); 523 return error; 524 abort: 525 if (m0) 526 m_freem(m0); 527 return error; 528 } 529 530 531 static int 532 smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct thread *td) 533 { 534 struct nbpcb *nbp = vcp->vc_tdata; 535 u_int8_t rpcode; 536 int error, rplen; 537 538 nbp->nbp_flags |= NBF_RECVLOCK; 539 error = nbssn_recv(nbp, mpp, &rplen, &rpcode, td); 540 nbp->nbp_flags &= ~NBF_RECVLOCK; 541 return error; 542 } 543 544 static void 545 smb_nbst_timo(struct smb_vc *vcp) 546 { 547 return; 548 } 549 550 static void 551 smb_nbst_intr(struct smb_vc *vcp) 552 { 553 struct nbpcb *nbp = vcp->vc_tdata; 554 555 if (nbp == NULL || nbp->nbp_tso == NULL) 556 return; 557 sorwakeup(nbp->nbp_tso); 558 sowwakeup(nbp->nbp_tso); 559 } 560 561 static int 562 smb_nbst_getparam(struct smb_vc *vcp, int param, void *data) 563 { 564 struct nbpcb *nbp = vcp->vc_tdata; 565 566 switch (param) { 567 case SMBTP_SNDSZ: 568 *(int*)data = nbp->nbp_sndbuf; 569 break; 570 case SMBTP_RCVSZ: 571 *(int*)data = nbp->nbp_rcvbuf; 572 break; 573 case SMBTP_TIMEOUT: 574 *(struct timespec*)data = nbp->nbp_timo; 575 break; 576 default: 577 return EINVAL; 578 } 579 return 0; 580 } 581 582 static int 583 smb_nbst_setparam(struct smb_vc *vcp, int param, void *data) 584 { 585 struct nbpcb *nbp = vcp->vc_tdata; 586 587 switch (param) { 588 case SMBTP_SELECTID: 589 nbp->nbp_selectid = data; 590 break; 591 default: 592 return EINVAL; 593 } 594 return 0; 595 } 596 597 /* 598 * Check for fatal errors 599 */ 600 static int 601 smb_nbst_fatal(struct smb_vc *vcp, int error) 602 { 603 switch (error) { 604 case ENOTCONN: 605 case ENETRESET: 606 case ECONNABORTED: 607 return 1; 608 } 609 return 0; 610 } 611 612 613 struct smb_tran_desc smb_tran_nbtcp_desc = { 614 SMBT_NBTCP, 615 smb_nbst_create, smb_nbst_done, 616 smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect, 617 smb_nbst_send, smb_nbst_recv, 618 smb_nbst_timo, smb_nbst_intr, 619 smb_nbst_getparam, smb_nbst_setparam, 620 smb_nbst_fatal 621 }; 622 623