The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netsmb/smb_trantcp.c

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    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 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD$");
   35 
   36 #include <sys/param.h>
   37 #include <sys/condvar.h>
   38 #include <sys/kernel.h>
   39 #include <sys/lock.h>
   40 #include <sys/malloc.h>
   41 #include <sys/mbuf.h>
   42 #include <sys/poll.h>
   43 #include <sys/proc.h>
   44 #include <sys/protosw.h>
   45 #include <sys/signalvar.h>
   46 #include <sys/socket.h>
   47 #include <sys/socketvar.h>
   48 #include <sys/sx.h>
   49 #include <sys/sysctl.h>
   50 #include <sys/systm.h>
   51 #include <sys/uio.h>
   52 
   53 #include <net/if.h>
   54 #include <net/route.h>
   55 
   56 #include <netinet/in.h>
   57 #include <netinet/tcp.h>
   58 
   59 #include <sys/mchain.h>
   60 
   61 #include <netsmb/netbios.h>
   62 
   63 #include <netsmb/smb.h>
   64 #include <netsmb/smb_conn.h>
   65 #include <netsmb/smb_tran.h>
   66 #include <netsmb/smb_trantcp.h>
   67 #include <netsmb/smb_subr.h>
   68 
   69 #define M_NBDATA        M_PCB
   70 
   71 static int smb_tcpsndbuf = NB_SNDQ - 1;
   72 static int smb_tcprcvbuf = NB_RCVQ - 1;
   73 
   74 SYSCTL_DECL(_net_smb);
   75 SYSCTL_INT(_net_smb, OID_AUTO, tcpsndbuf, CTLFLAG_RW, &smb_tcpsndbuf, 0, "");
   76 SYSCTL_INT(_net_smb, OID_AUTO, tcprcvbuf, CTLFLAG_RW, &smb_tcprcvbuf, 0, "");
   77 
   78 #define nb_sosend(so,m,flags,td) sosend(so, NULL, 0, m, 0, 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 nbssn_rselect(struct nbpcb *nbp, struct timeval *tv, int events,
   99         struct thread *td)
  100 {
  101         struct timeval atv, rtv, ttv;
  102         int ncoll, timo, error, revents;
  103 
  104         if (tv) {
  105                 atv = *tv;
  106                 if (itimerfix(&atv)) {
  107                         error = EINVAL;
  108                         goto done_noproclock;
  109                 }
  110                 getmicrouptime(&rtv);
  111                 timevaladd(&atv, &rtv);
  112         }
  113         timo = 0;
  114         mtx_lock(&sellock);
  115 retry:
  116 
  117         ncoll = nselcoll;
  118         thread_lock(td);
  119         td->td_flags |= TDF_SELECT;
  120         thread_unlock(td);
  121         mtx_unlock(&sellock);
  122 
  123         /* XXX: Should be done when the thread is initialized. */
  124         TAILQ_INIT(&td->td_selq);
  125         revents = sopoll(nbp->nbp_tso, events, NULL, td);
  126         mtx_lock(&sellock);
  127         if (revents) {
  128                 error = 0;
  129                 goto done;
  130         }
  131         if (tv) {
  132                 getmicrouptime(&rtv);
  133                 if (timevalcmp(&rtv, &atv, >=)) {
  134                         error = EWOULDBLOCK;
  135                         goto done;
  136                 }
  137                 ttv = atv;
  138                 timevalsub(&ttv, &rtv);
  139                 timo = tvtohz(&ttv);
  140         }
  141         /*
  142          * An event of our interest may occur during locking a process.
  143          * In order to avoid missing the event that occurred during locking
  144          * the process, test P_SELECT and rescan file descriptors if
  145          * necessary.
  146          */
  147         thread_lock(td);
  148         if ((td->td_flags & TDF_SELECT) == 0 || nselcoll != ncoll) {
  149                 thread_unlock(td);
  150                 goto retry;
  151         }
  152         thread_unlock(td);
  153 
  154         if (timo > 0)
  155                 error = cv_timedwait(&selwait, &sellock, timo);
  156         else {
  157                 cv_wait(&selwait, &sellock);
  158                 error = 0;
  159         }
  160 
  161 done:
  162         clear_selinfo_list(td);
  163         
  164         thread_lock(td);
  165         td->td_flags &= ~TDF_SELECT;
  166         thread_unlock(td);
  167         mtx_unlock(&sellock);
  168 
  169 done_noproclock:
  170         if (error == ERESTART)
  171                 return 0;
  172         return error;
  173 }
  174 
  175 static int
  176 nb_intr(struct nbpcb *nbp, struct proc *p)
  177 {
  178         return 0;
  179 }
  180 
  181 static void
  182 nb_upcall(struct socket *so, void *arg, int waitflag)
  183 {
  184         struct nbpcb *nbp = arg;
  185 
  186         if (arg == NULL || nbp->nbp_selectid == NULL)
  187                 return;
  188         wakeup(nbp->nbp_selectid);
  189 }
  190 
  191 static int
  192 nb_sethdr(struct mbuf *m, u_int8_t type, u_int32_t len)
  193 {
  194         u_int32_t *p = mtod(m, u_int32_t *);
  195 
  196         *p = htonl((len & 0x1FFFF) | (type << 24));
  197         return 0;
  198 }
  199 
  200 static int
  201 nb_put_name(struct mbchain *mbp, struct sockaddr_nb *snb)
  202 {
  203         int error;
  204         u_char seglen, *cp;
  205 
  206         cp = snb->snb_name;
  207         if (*cp == 0)
  208                 return EINVAL;
  209         NBDEBUG("[%s]\n", cp);
  210         for (;;) {
  211                 seglen = (*cp) + 1;
  212                 error = mb_put_mem(mbp, cp, seglen, MB_MSYSTEM);
  213                 if (error)
  214                         return error;
  215                 if (seglen == 1)
  216                         break;
  217                 cp += seglen;
  218         }
  219         return 0;
  220 }
  221 
  222 static int
  223 nb_connect_in(struct nbpcb *nbp, struct sockaddr_in *to, struct thread *td)
  224 {
  225         struct socket *so;
  226         int error, s;
  227 
  228         error = socreate(AF_INET, &so, SOCK_STREAM, IPPROTO_TCP,
  229             td->td_ucred, td);
  230         if (error)
  231                 return error;
  232         nbp->nbp_tso = so;
  233         so->so_upcallarg = (caddr_t)nbp;
  234         so->so_upcall = nb_upcall;
  235         SOCKBUF_LOCK(&so->so_rcv);
  236         so->so_rcv.sb_flags |= SB_UPCALL;
  237         SOCKBUF_UNLOCK(&so->so_rcv);
  238         so->so_rcv.sb_timeo = (5 * hz);
  239         so->so_snd.sb_timeo = (5 * hz);
  240         error = soreserve(so, nbp->nbp_sndbuf, nbp->nbp_rcvbuf);
  241         if (error)
  242                 goto bad;
  243         nb_setsockopt_int(so, SOL_SOCKET, SO_KEEPALIVE, 1);
  244         nb_setsockopt_int(so, IPPROTO_TCP, TCP_NODELAY, 1);
  245         SOCKBUF_LOCK(&so->so_rcv);
  246         so->so_rcv.sb_flags &= ~SB_NOINTR;
  247         SOCKBUF_UNLOCK(&so->so_rcv);
  248         SOCKBUF_LOCK(&so->so_snd);
  249         so->so_snd.sb_flags &= ~SB_NOINTR;
  250         SOCKBUF_UNLOCK(&so->so_snd);
  251         error = soconnect(so, (struct sockaddr*)to, td);
  252         if (error)
  253                 goto bad;
  254         s = splnet();
  255         while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
  256                 tsleep(&so->so_timeo, PSOCK, "nbcon", 2 * hz);
  257                 if ((so->so_state & SS_ISCONNECTING) && so->so_error == 0 &&
  258                         (error = nb_intr(nbp, td->td_proc)) != 0) {
  259                         so->so_state &= ~SS_ISCONNECTING;
  260                         splx(s);
  261                         goto bad;
  262                 }
  263         }
  264         if (so->so_error) {
  265                 error = so->so_error;
  266                 so->so_error = 0;
  267                 splx(s);
  268                 goto bad;
  269         }
  270         splx(s);
  271         return 0;
  272 bad:
  273         smb_nbst_disconnect(nbp->nbp_vc, td);
  274         return error;
  275 }
  276 
  277 static int
  278 nbssn_rq_request(struct nbpcb *nbp, struct thread *td)
  279 {
  280         struct mbchain mb, *mbp = &mb;
  281         struct mdchain md, *mdp = &md;
  282         struct mbuf *m0;
  283         struct timeval tv;
  284         struct sockaddr_in sin;
  285         u_short port;
  286         u_int8_t rpcode;
  287         int error, rplen;
  288 
  289         error = mb_init(mbp);
  290         if (error)
  291                 return error;
  292         mb_put_uint32le(mbp, 0);
  293         nb_put_name(mbp, nbp->nbp_paddr);
  294         nb_put_name(mbp, nbp->nbp_laddr);
  295         nb_sethdr(mbp->mb_top, NB_SSN_REQUEST, mb_fixhdr(mbp) - 4);
  296         error = nb_sosend(nbp->nbp_tso, mbp->mb_top, 0, td);
  297         if (!error) {
  298                 nbp->nbp_state = NBST_RQSENT;
  299         }
  300         mb_detach(mbp);
  301         mb_done(mbp);
  302         if (error)
  303                 return error;
  304         TIMESPEC_TO_TIMEVAL(&tv, &nbp->nbp_timo);
  305         error = nbssn_rselect(nbp, &tv, POLLIN, td);
  306         if (error == EWOULDBLOCK) {     /* Timeout */
  307                 NBDEBUG("initial request timeout\n");
  308                 return ETIMEDOUT;
  309         }
  310         if (error)                      /* restart or interrupt */
  311                 return error;
  312         error = nbssn_recv(nbp, &m0, &rplen, &rpcode, td);
  313         if (error) {
  314                 NBDEBUG("recv() error %d\n", error);
  315                 return error;
  316         }
  317         /*
  318          * Process NETBIOS reply
  319          */
  320         if (m0)
  321                 md_initm(mdp, m0);
  322         error = 0;
  323         do {
  324                 if (rpcode == NB_SSN_POSRESP) {
  325                         nbp->nbp_state = NBST_SESSION;
  326                         nbp->nbp_flags |= NBF_CONNECTED;
  327                         break;
  328                 }
  329                 if (rpcode != NB_SSN_RTGRESP) {
  330                         error = ECONNABORTED;
  331                         break;
  332                 }
  333                 if (rplen != 6) {
  334                         error = ECONNABORTED;
  335                         break;
  336                 }
  337                 md_get_mem(mdp, (caddr_t)&sin.sin_addr, 4, MB_MSYSTEM);
  338                 md_get_uint16(mdp, &port);
  339                 sin.sin_port = port;
  340                 nbp->nbp_state = NBST_RETARGET;
  341                 smb_nbst_disconnect(nbp->nbp_vc, td);
  342                 error = nb_connect_in(nbp, &sin, td);
  343                 if (!error)
  344                         error = nbssn_rq_request(nbp, td);
  345                 if (error) {
  346                         smb_nbst_disconnect(nbp->nbp_vc, td);
  347                         break;
  348                 }
  349         } while(0);
  350         if (m0)
  351                 md_done(mdp);
  352         return error;
  353 }
  354 
  355 static int
  356 nbssn_recvhdr(struct nbpcb *nbp, int *lenp,
  357         u_int8_t *rpcodep, int flags, struct thread *td)
  358 {
  359         struct socket *so = nbp->nbp_tso;
  360         struct uio auio;
  361         struct iovec aio;
  362         u_int32_t len;
  363         int error;
  364 
  365         aio.iov_base = (caddr_t)&len;
  366         aio.iov_len = sizeof(len);
  367         auio.uio_iov = &aio;
  368         auio.uio_iovcnt = 1;
  369         auio.uio_segflg = UIO_SYSSPACE;
  370         auio.uio_rw = UIO_READ;
  371         auio.uio_offset = 0;
  372         auio.uio_resid = sizeof(len);
  373         auio.uio_td = td;
  374         error = soreceive(so, (struct sockaddr **)NULL, &auio,
  375             (struct mbuf **)NULL, (struct mbuf **)NULL, &flags);
  376         if (error)
  377                 return error;
  378         if (auio.uio_resid > 0) {
  379                 SMBSDEBUG("short reply\n");
  380                 return EPIPE;
  381         }
  382         len = ntohl(len);
  383         *rpcodep = (len >> 24) & 0xFF;
  384         len &= 0x1ffff;
  385         if (len > SMB_MAXPKTLEN) {
  386                 SMBERROR("packet too long (%d)\n", len);
  387                 return EFBIG;
  388         }
  389         *lenp = len;
  390         return 0;
  391 }
  392 
  393 static int
  394 nbssn_recv(struct nbpcb *nbp, struct mbuf **mpp, int *lenp,
  395         u_int8_t *rpcodep, struct thread *td)
  396 {
  397         struct socket *so = nbp->nbp_tso;
  398         struct uio auio;
  399         struct mbuf *m, *tm, *im;
  400         u_int8_t rpcode;
  401         int len, resid;
  402         int error, rcvflg;
  403 
  404         if (so == NULL)
  405                 return ENOTCONN;
  406 
  407         if (mpp)
  408                 *mpp = NULL;
  409         m = NULL;
  410         for(;;) {
  411                 /*
  412                  * Poll for a response header.
  413                  * If we don't have one waiting, return.
  414                  */
  415                 len = 0;
  416                 rpcode = 0;
  417                 error = nbssn_recvhdr(nbp, &len, &rpcode, MSG_DONTWAIT, td);
  418                 if ((so->so_state & (SS_ISDISCONNECTING | SS_ISDISCONNECTED)) ||
  419                     (so->so_rcv.sb_state & SBS_CANTRCVMORE)) {
  420                         nbp->nbp_state = NBST_CLOSED;
  421                         NBDEBUG("session closed by peer\n");
  422                         return ECONNRESET;
  423                 }
  424                 if (error)
  425                         return error;
  426                 if (len == 0 && nbp->nbp_state != NBST_SESSION)
  427                         break;
  428                 /* no data, try again */
  429                 if (rpcode == NB_SSN_KEEPALIVE)
  430                         continue;
  431 
  432                 /*
  433                  * Loop, blocking, for data following the response header.
  434                  *
  435                  * Note that we can't simply block here with MSG_WAITALL for the
  436                  * entire response size, as it may be larger than the TCP
  437                  * slow-start window that the sender employs.  This will result
  438                  * in the sender stalling until the delayed ACK is sent, then
  439                  * resuming slow-start, resulting in very poor performance.
  440                  *
  441                  * Instead, we never request more than NB_SORECEIVE_CHUNK
  442                  * bytes at a time, resulting in an ack being pushed by
  443                  * the TCP code at the completion of each call.
  444                  */
  445                 resid = len;
  446                 while (resid > 0) {
  447                         tm = NULL;
  448                         rcvflg = MSG_WAITALL;
  449                         bzero(&auio, sizeof(auio));
  450                         auio.uio_resid = min(resid, NB_SORECEIVE_CHUNK);
  451                         auio.uio_td = td;
  452                         resid -= auio.uio_resid;
  453                         /*
  454                          * Spin until we have collected everything in
  455                          * this chunk.
  456                          */
  457                         do {
  458                                 rcvflg = MSG_WAITALL;
  459                                 error = soreceive(so, (struct sockaddr **)NULL,
  460                                     &auio, &tm, (struct mbuf **)NULL, &rcvflg);
  461                         } while (error == EWOULDBLOCK || error == EINTR ||
  462                                  error == ERESTART);
  463                         if (error)
  464                                 goto out;
  465                         /* short return guarantees unhappiness */
  466                         if (auio.uio_resid > 0) {
  467                                 SMBERROR("packet is shorter than expected\n");
  468                                 error = EPIPE;
  469                                 goto out;
  470                         }
  471                         /* append received chunk to previous chunk(s) */
  472                         if (m == NULL) {
  473                                 m = tm;
  474                         } else {
  475                                 /*
  476                                  * Just glue the new chain on the end.
  477                                  * Consumer will pullup as required.
  478                                  */
  479                                 for (im = m; im->m_next != NULL; im = im->m_next)
  480                                         ;
  481                                 im->m_next = tm;
  482                         }
  483                 }
  484                 /* got a session/message packet? */
  485                 if (nbp->nbp_state == NBST_SESSION &&
  486                     rpcode == NB_SSN_MESSAGE)
  487                         break;
  488                 /* drop packet and try for another */
  489                 NBDEBUG("non-session packet %x\n", rpcode);
  490                 if (m) {
  491                         m_freem(m);
  492                         m = NULL;
  493                 }
  494         }
  495 
  496 out:
  497         if (error) {
  498                 if (m)
  499                         m_freem(m);
  500                 return error;
  501         }
  502         if (mpp)
  503                 *mpp = m;
  504         else
  505                 m_freem(m);
  506         *lenp = len;
  507         *rpcodep = rpcode;
  508         return 0;
  509 }
  510 
  511 /*
  512  * SMB transport interface
  513  */
  514 static int
  515 smb_nbst_create(struct smb_vc *vcp, struct thread *td)
  516 {
  517         struct nbpcb *nbp;
  518 
  519         MALLOC(nbp, struct nbpcb *, sizeof *nbp, M_NBDATA, M_WAITOK);
  520         bzero(nbp, sizeof *nbp);
  521         nbp->nbp_timo.tv_sec = 15;      /* XXX: sysctl ? */
  522         nbp->nbp_state = NBST_CLOSED;
  523         nbp->nbp_vc = vcp;
  524         nbp->nbp_sndbuf = smb_tcpsndbuf;
  525         nbp->nbp_rcvbuf = smb_tcprcvbuf;
  526         vcp->vc_tdata = nbp;
  527         return 0;
  528 }
  529 
  530 static int
  531 smb_nbst_done(struct smb_vc *vcp, struct thread *td)
  532 {
  533         struct nbpcb *nbp = vcp->vc_tdata;
  534 
  535         if (nbp == NULL)
  536                 return ENOTCONN;
  537         smb_nbst_disconnect(vcp, td);
  538         if (nbp->nbp_laddr)
  539                 free(nbp->nbp_laddr, M_SONAME);
  540         if (nbp->nbp_paddr)
  541                 free(nbp->nbp_paddr, M_SONAME);
  542         free(nbp, M_NBDATA);
  543         return 0;
  544 }
  545 
  546 static int
  547 smb_nbst_bind(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td)
  548 {
  549         struct nbpcb *nbp = vcp->vc_tdata;
  550         struct sockaddr_nb *snb;
  551         int error, slen;
  552 
  553         NBDEBUG("\n");
  554         error = EINVAL;
  555         do {
  556                 if (nbp->nbp_flags & NBF_LOCADDR)
  557                         break;
  558                 /*
  559                  * It is possible to create NETBIOS name in the kernel,
  560                  * but nothing prevents us to do it in the user space.
  561                  */
  562                 if (sap == NULL)
  563                         break;
  564                 slen = sap->sa_len;
  565                 if (slen < NB_MINSALEN)
  566                         break;
  567                 snb = (struct sockaddr_nb*)sodupsockaddr(sap, M_WAITOK);
  568                 if (snb == NULL) {
  569                         error = ENOMEM;
  570                         break;
  571                 }
  572                 nbp->nbp_laddr = snb;
  573                 nbp->nbp_flags |= NBF_LOCADDR;
  574                 error = 0;
  575         } while(0);
  576         return error;
  577 }
  578 
  579 static int
  580 smb_nbst_connect(struct smb_vc *vcp, struct sockaddr *sap, struct thread *td)
  581 {
  582         struct nbpcb *nbp = vcp->vc_tdata;
  583         struct sockaddr_in sin;
  584         struct sockaddr_nb *snb;
  585         struct timespec ts1, ts2;
  586         int error, slen;
  587 
  588         NBDEBUG("\n");
  589         if (nbp->nbp_tso != NULL)
  590                 return EISCONN;
  591         if (nbp->nbp_laddr == NULL)
  592                 return EINVAL;
  593         slen = sap->sa_len;
  594         if (slen < NB_MINSALEN)
  595                 return EINVAL;
  596         if (nbp->nbp_paddr) {
  597                 free(nbp->nbp_paddr, M_SONAME);
  598                 nbp->nbp_paddr = NULL;
  599         }
  600         snb = (struct sockaddr_nb*)sodupsockaddr(sap, M_WAITOK);
  601         if (snb == NULL)
  602                 return ENOMEM;
  603         nbp->nbp_paddr = snb;
  604         sin = snb->snb_addrin;
  605         getnanotime(&ts1);
  606         error = nb_connect_in(nbp, &sin, td);
  607         if (error)
  608                 return error;
  609         getnanotime(&ts2);
  610         timespecsub(&ts2, &ts1);
  611         if (ts2.tv_sec == 0 && ts2.tv_sec == 0)
  612                 ts2.tv_sec = 1;
  613         nbp->nbp_timo = ts2;
  614         timespecadd(&nbp->nbp_timo, &ts2);
  615         timespecadd(&nbp->nbp_timo, &ts2);
  616         timespecadd(&nbp->nbp_timo, &ts2);      /*  * 4 */
  617         error = nbssn_rq_request(nbp, td);
  618         if (error)
  619                 smb_nbst_disconnect(vcp, td);
  620         return error;
  621 }
  622 
  623 static int
  624 smb_nbst_disconnect(struct smb_vc *vcp, struct thread *td)
  625 {
  626         struct nbpcb *nbp = vcp->vc_tdata;
  627         struct socket *so;
  628 
  629         if (nbp == NULL || nbp->nbp_tso == NULL)
  630                 return ENOTCONN;
  631         if ((so = nbp->nbp_tso) != NULL) {
  632                 nbp->nbp_flags &= ~NBF_CONNECTED;
  633                 nbp->nbp_tso = (struct socket *)NULL;
  634                 soshutdown(so, 2);
  635                 soclose(so);
  636         }
  637         if (nbp->nbp_state != NBST_RETARGET) {
  638                 nbp->nbp_state = NBST_CLOSED;
  639         }
  640         return 0;
  641 }
  642 
  643 static int
  644 smb_nbst_send(struct smb_vc *vcp, struct mbuf *m0, struct thread *td)
  645 {
  646         struct nbpcb *nbp = vcp->vc_tdata;
  647         int error;
  648 
  649         if (nbp->nbp_state != NBST_SESSION) {
  650                 error = ENOTCONN;
  651                 goto abort;
  652         }
  653         M_PREPEND(m0, 4, M_TRYWAIT);
  654         if (m0 == NULL)
  655                 return ENOBUFS;
  656         nb_sethdr(m0, NB_SSN_MESSAGE, m_fixhdr(m0) - 4);
  657         error = nb_sosend(nbp->nbp_tso, m0, 0, td);
  658         return error;
  659 abort:
  660         if (m0)
  661                 m_freem(m0);
  662         return error;
  663 }
  664 
  665 
  666 static int
  667 smb_nbst_recv(struct smb_vc *vcp, struct mbuf **mpp, struct thread *td)
  668 {
  669         struct nbpcb *nbp = vcp->vc_tdata;
  670         u_int8_t rpcode;
  671         int error, rplen;
  672 
  673         nbp->nbp_flags |= NBF_RECVLOCK;
  674         error = nbssn_recv(nbp, mpp, &rplen, &rpcode, td);
  675         nbp->nbp_flags &= ~NBF_RECVLOCK;
  676         return error;
  677 }
  678 
  679 static void
  680 smb_nbst_timo(struct smb_vc *vcp)
  681 {
  682         return;
  683 }
  684 
  685 static void
  686 smb_nbst_intr(struct smb_vc *vcp)
  687 {
  688         struct nbpcb *nbp = vcp->vc_tdata;
  689 
  690         if (nbp == NULL || nbp->nbp_tso == NULL)
  691                 return;
  692         sorwakeup(nbp->nbp_tso);
  693         sowwakeup(nbp->nbp_tso);
  694 }
  695 
  696 static int
  697 smb_nbst_getparam(struct smb_vc *vcp, int param, void *data)
  698 {
  699         struct nbpcb *nbp = vcp->vc_tdata;
  700 
  701         switch (param) {
  702             case SMBTP_SNDSZ:
  703                 *(int*)data = nbp->nbp_sndbuf;
  704                 break;
  705             case SMBTP_RCVSZ:
  706                 *(int*)data = nbp->nbp_rcvbuf;
  707                 break;
  708             case SMBTP_TIMEOUT:
  709                 *(struct timespec*)data = nbp->nbp_timo;
  710                 break;
  711             default:
  712                 return EINVAL;
  713         }
  714         return 0;
  715 }
  716 
  717 static int
  718 smb_nbst_setparam(struct smb_vc *vcp, int param, void *data)
  719 {
  720         struct nbpcb *nbp = vcp->vc_tdata;
  721 
  722         switch (param) {
  723             case SMBTP_SELECTID:
  724                 nbp->nbp_selectid = data;
  725                 break;
  726             default:
  727                 return EINVAL;
  728         }
  729         return 0;
  730 }
  731 
  732 /*
  733  * Check for fatal errors
  734  */
  735 static int
  736 smb_nbst_fatal(struct smb_vc *vcp, int error)
  737 {
  738         switch (error) {
  739             case ENOTCONN:
  740             case ENETRESET:
  741             case ECONNABORTED:
  742                 return 1;
  743         }
  744         return 0;
  745 }
  746 
  747 
  748 struct smb_tran_desc smb_tran_nbtcp_desc = {
  749         SMBT_NBTCP,
  750         smb_nbst_create, smb_nbst_done,
  751         smb_nbst_bind, smb_nbst_connect, smb_nbst_disconnect,
  752         smb_nbst_send, smb_nbst_recv,
  753         smb_nbst_timo, smb_nbst_intr,
  754         smb_nbst_getparam, smb_nbst_setparam,
  755         smb_nbst_fatal
  756 };
  757 

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