sys/netproto/smb/smb_trantcp.c

   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);
 477         if (ts2.tv_sec == 0) {
 478                 ts2.tv_sec = 1;
 479                 ts2.tv_nsec = 0;
 480         }
 481         nbp->nbp_timo = ts2;
 482         timespecadd(&nbp->nbp_timo, &ts2);
 483         timespecadd(&nbp->nbp_timo, &ts2);
 484         timespecadd(&nbp->nbp_timo, &ts2);      /*  * 4 */
 485         error = nbssn_rq_request(nbp, td);
 486         if (error)
 487                 smb_nbst_disconnect(vcp, td);
 488         return error;
 489 }
 490
 491 static int
 492 smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td)
 493 {
 494         struct nbpcb *nbp = vcp->vc_tdata;
 495         struct socket *so;
 496
 497         if (nbp == NULL || nbp->nbp_tso == NULL)
 498                 return ENOTCONN;
 499         if ((so = nbp->nbp_tso) != NULL) {
 500                 nbp->nbp_flags &= ~NBF_CONNECTED;
 501                 nbp->nbp_tso = NULL;
 502                 soshutdown(so, SHUT_RDWR);
 503                 soclose(so, FNONBLOCK);
 504         }
 505         if (nbp->nbp_state != NBST_RETARGET) {
 506                 nbp->nbp_state = NBST_CLOSED;
 507         }
 508         return 0;
 509 }
 510
 511 static int
 512 smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct thread *td)
 513 {
 514         struct nbpcb *nbp = vcp->vc_tdata;
 515         int error;
 516
 517         if (nbp->nbp_state != NBST_SESSION) {
 518                 error = ENOTCONN;
 519                 goto abort;
 520         }
 521         M_PREPEND(m0, 4, M_WAITOK);
 522         if (m0 == NULL)
 523                 return ENOBUFS;
 524         nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4);
 525         error = nb_sosend(nbp->nbp_tso, m0, 0, td);
 526         return error;
 527 abort:
 528         if (m0)
 529                 m_freem(m0);
 530         return error;
 531 }
 532
 533
 534 static int
 535 smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct thread *td)
 536 {
 537         struct nbpcb *nbp = vcp->vc_tdata;
 538         u_int8_t rpcode;
 539         int error, rplen;
 540
 541         nbp->nbp_flags |= NBF_RECVLOCK;
 542         error = nbssn_recv(nbp, mpp, &rplen, &rpcode, td);
 543         nbp->nbp_flags &= ~NBF_RECVLOCK;
 544         return error;
 545 }
 546
 547 static void
 548 smb_nbst_timo(struct smb_vc *vcp)
 549 {
 550         return;
 551 }
 552
 553 static void
 554 smb_nbst_intr(struct smb_vc *vcp)
 555 {
 556         struct nbpcb *nbp = vcp->vc_tdata;
 557
 558         if (nbp == NULL || nbp->nbp_tso == NULL)
 559                 return;
 560         sorwakeup(nbp->nbp_tso);
 561         sowwakeup(nbp->nbp_tso);
 562 }
 563
 564 static int
 565 smb_nbst_getparam(struct smb_vc *vcp, int param, void *data)
 566 {
 567         struct nbpcb *nbp = vcp->vc_tdata;
 568
 569         switch (param) {
 570             case SMBTP_SNDSZ:
 571                 *(int*)data = nbp->nbp_sndbuf;
 572                 break;
 573             case SMBTP_RCVSZ:
 574                 *(int*)data = nbp->nbp_rcvbuf;
 575                 break;
 576             case SMBTP_TIMEOUT:
 577                 *(struct timespec*)data = nbp->nbp_timo;
 578                 break;
 579             default:
 580                 return EINVAL;
 581         }
 582         return 0;
 583 }
 584
 585 static int
 586 smb_nbst_setparam(struct smb_vc *vcp, int param, void *data)
 587 {
 588         struct nbpcb *nbp = vcp->vc_tdata;
 589
 590         switch (param) {
 591             case SMBTP_SELECTID:
 592                 nbp->nbp_selectid = data;
 593                 break;
 594             default:
 595                 return EINVAL;
 596         }
 597         return 0;
 598 }
 599
 600 /*
 601  * Check for fatal errors
 602  */
 603 static int
 604 smb_nbst_fatal(struct smb_vc *vcp, int error)
 605 {
 606         switch (error) {
 607             case ENOTCONN:
 608             case ENETRESET:
 609             case ECONNABORTED:
 610                 return 1;
 611         }
 612         return 0;
 613 }
 614
 615
 616 struct smb_tran_desc smb_tran_nbtcp_desc = {
 617         SMBT_NBTCP,
 618         smb_nbst_create, smb_nbst_done,
 619         smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect,
 620         smb_nbst_send, smb_nbst_recv,
 621         smb_nbst_timo, smb_nbst_intr,
 622         smb_nbst_getparam, smb_nbst_setparam,
 623         smb_nbst_fatal
 624 };
 625