ncp_sock.c

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    1 /*-
    2  * Copyright (c) 1999, 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  * Low level socket routines
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include <sys/param.h>
   39 #include <sys/errno.h>
   40 #include <sys/lock.h>
   41 #include <sys/malloc.h>
   42 #include <sys/mutex.h>
   43 #include <sys/systm.h>
   44 #include <sys/proc.h>
   45 #include <sys/socket.h>
   46 #include <sys/socketvar.h>
   47 #include <sys/protosw.h>
   48 #include <sys/kernel.h>
   49 #include <sys/uio.h>
   50 #include <sys/syslog.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/condvar.h>
   53 #include <net/route.h>
   54 
   55 #include <netipx/ipx.h>
   56 #include <netipx/ipx_pcb.h>
   57 
   58 #include <netncp/ncp.h>
   59 #include <netncp/ncp_conn.h>
   60 #include <netncp/ncp_sock.h>
   61 #include <netncp/ncp_subr.h>
   62 #include <netncp/ncp_rq.h>
   63 
   64 #define ipx_setnullnet(x) ((x).x_net.s_net[0]=0); ((x).x_net.s_net[1]=0);
   65 #define ipx_setnullhost(x) ((x).x_host.s_host[0] = 0); \
   66         ((x).x_host.s_host[1] = 0); ((x).x_host.s_host[2] = 0);
   67 
   68 /*int ncp_poll(struct socket *so, int events);*/
   69 /*static int ncp_getsockname(struct socket *so, caddr_t asa, int *alen);*/
   70 static int ncp_soconnect(struct socket *so, struct sockaddr *target,
   71                          struct thread *td);
   72 
   73 
   74 /* This will need only if native IP used, or (unlikely) NCP will be
   75  * implemented on the socket level
   76  */
   77 static int
   78 ncp_soconnect(struct socket *so, struct sockaddr *target, struct thread *td)
   79 {
   80         int error, s;
   81 
   82         error = soconnect(so, (struct sockaddr*)target, td);
   83         if (error)
   84                 return error;
   85         /*
   86          * Wait for the connection to complete. Cribbed from the
   87          * connect system call but with the wait timing out so
   88          * that interruptible mounts don't hang here for a long time.
   89          */
   90         error = EIO;
   91         s = splnet();
   92         while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
   93                 (void) tsleep((caddr_t)&so->so_timeo, PSOCK, "ncpcon", 2 * hz);
   94                 if ((so->so_state & SS_ISCONNECTING) &&
   95                     so->so_error == 0 /*&& rep &&*/) {
   96                         so->so_state &= ~SS_ISCONNECTING;
   97                         splx(s);
   98                         goto bad;
   99                 }
  100         }
  101         if (so->so_error) {
  102                 error = so->so_error;
  103                 so->so_error = 0;
  104                 splx(s);
  105                 goto bad;
  106         }
  107                 splx(s);
  108         error=0;
  109 bad:
  110         return error;
  111 }
  112 #ifdef notyet
  113 static int
  114 ncp_getsockname(struct socket *so, caddr_t asa, int *alen) {
  115         struct sockaddr *sa;
  116         int len=0, error;
  117 
  118         sa = 0;
  119         error = (*so->so_proto->pr_usrreqs->pru_sockaddr)(so, &sa);
  120         if (error==0) {
  121                 if (sa) {
  122                         len = min(len, sa->sa_len);
  123                         bcopy(sa, (caddr_t)asa, (u_int)len);
  124                 }
  125                 *alen=len;
  126         }
  127         if (sa)
  128                 FREE(sa, M_SONAME);
  129         return (error);
  130 }
  131 #endif
  132 int ncp_sock_recv(struct socket *so, struct mbuf **mp, int *rlen)
  133 {
  134         struct uio auio;
  135         struct thread *td = curthread; /* XXX */
  136         int error,flags,len;
  137 
  138         auio.uio_resid = len = 1000000;
  139         auio.uio_td = td;
  140         flags = MSG_DONTWAIT;
  141 
  142 /*      error = soreceive(so, 0, &auio, (struct mbuf **)0, (struct mbuf **)0,
  143             &flags);*/
  144         error = soreceive(so, 0, &auio, mp, (struct mbuf **)0, &flags);
  145         *rlen = len - auio.uio_resid;
  146 /*      if (!error) {
  147             *rlen=iov.iov_len;
  148         } else
  149             *rlen=0;*/
  150 #ifdef NCP_SOCKET_DEBUG
  151         if (error)
  152                 printf("ncp_recv: err=%d\n", error);
  153 #endif
  154         return (error);
  155 }
  156 
  157 int
  158 ncp_sock_send(struct socket *so, struct mbuf *top, struct ncp_rq *rqp)
  159 {
  160         struct thread *td = curthread; /* XXX */
  161         struct sockaddr *to = 0;
  162         struct ncp_conn *conn = rqp->nr_conn;
  163         struct mbuf *m;
  164         int error, flags=0;
  165 
  166         for (;;) {
  167                 m = m_copym(top, 0, M_COPYALL, M_TRYWAIT);
  168 /*              NCPDDEBUG(m);*/
  169                 error = sosend(so, to, 0, m, 0, flags, td);
  170                 if (error == 0 || error == EINTR || error == ENETDOWN)
  171                         break;
  172                 if (rqp->rexmit == 0) break;
  173                 rqp->rexmit--;
  174                 pause("ncprsn", conn->li.timeout * hz);
  175                 error = ncp_chkintr(conn, td);
  176                 if (error == EINTR) break;
  177         }
  178         if (error) {
  179                 log(LOG_INFO, "ncp_send: error %d for server %s", error, conn->li.server);
  180         }
  181         return error;
  182 }
  183 
  184 int
  185 ncp_poll(struct socket *so, int events)
  186 {
  187         struct thread *td = curthread;
  188         int revents;
  189 
  190         /* Fake up enough state to look like we are in poll(2). */
  191         mtx_lock(&sellock);
  192         thread_lock(td);
  193         td->td_flags |= TDF_SELECT;
  194         thread_unlock(td);
  195         mtx_unlock(&sellock);
  196         TAILQ_INIT(&td->td_selq);
  197 
  198         revents = sopoll(so, events, NULL, td);
  199 
  200         /* Tear down the fake poll(2) state. */
  201         mtx_lock(&sellock);
  202         clear_selinfo_list(td);
  203         thread_lock(td);
  204         td->td_flags &= ~TDF_SELECT;
  205         thread_unlock(td);
  206         mtx_unlock(&sellock);
  207 
  208         return (revents);
  209 }
  210 
  211 int
  212 ncp_sock_rselect(struct socket *so, struct thread *td, struct timeval *tv,
  213                  int events)
  214 {
  215         struct timeval atv, rtv, ttv;
  216         int ncoll, timo, error, revents;
  217 
  218         if (tv) {
  219                 atv = *tv;
  220                 if (itimerfix(&atv)) {
  221                         error = EINVAL;
  222                         goto done_noproclock;
  223                 }
  224                 getmicrouptime(&rtv);
  225                 timevaladd(&atv, &rtv);
  226         }
  227         timo = 0;
  228         mtx_lock(&sellock);
  229 
  230 retry:
  231         ncoll = nselcoll;
  232         thread_lock(td);
  233         td->td_flags |= TDF_SELECT;
  234         thread_unlock(td);
  235         mtx_unlock(&sellock);
  236 
  237         TAILQ_INIT(&td->td_selq);
  238         revents = sopoll(so, events, NULL, td);
  239         mtx_lock(&sellock);
  240         if (revents) {
  241                 error = 0;
  242                 goto done;
  243         }
  244         if (tv) {
  245                 getmicrouptime(&rtv);
  246                 if (timevalcmp(&rtv, &atv, >=)) {
  247                         error = EWOULDBLOCK;
  248                         goto done;
  249                 }
  250                 ttv = atv;
  251                 timevalsub(&ttv, &rtv);
  252                 timo = tvtohz(&ttv);
  253         }
  254         /*
  255          * An event of our interest may occur during locking a thread.
  256          * In order to avoid missing the event that occurred during locking
  257          * the process, test TDF_SELECT and rescan file descriptors if
  258          * necessary.
  259          */
  260         thread_lock(td);
  261         if ((td->td_flags & TDF_SELECT) == 0 || nselcoll != ncoll) {
  262                 thread_unlock(td);
  263                 goto retry;
  264         }
  265         thread_unlock(td);
  266 
  267         if (timo > 0)
  268                 error = cv_timedwait(&selwait, &sellock, timo);
  269         else {
  270                 cv_wait(&selwait, &sellock);
  271                 error = 0;
  272         }
  273 
  274 done:
  275         clear_selinfo_list(td);
  276 
  277         thread_lock(td);
  278         td->td_flags &= ~TDF_SELECT;
  279         thread_unlock(td);
  280         mtx_unlock(&sellock);
  281 
  282 done_noproclock:
  283         if (error == ERESTART)
  284                 error = 0;
  285         return (error);
  286 }
  287 
  288 /*
  289  * Connect to specified server via IPX
  290  */
  291 static int
  292 ncp_sock_connect_ipx(struct ncp_conn *conn)
  293 {
  294         struct sockaddr_ipx sipx;
  295         struct ipxpcb *npcb;
  296         struct thread *td = conn->td;
  297         int addrlen, error, count;
  298 
  299         sipx.sipx_port = htons(0);
  300 
  301         for (count = 0;;count++) {
  302                 if (count > (IPXPORT_WELLKNOWN-IPXPORT_RESERVED)*2) {
  303                         error = EADDRINUSE;
  304                         goto bad;
  305                 }
  306                 conn->ncp_so = conn->wdg_so = NULL;
  307                 checkbad(socreate(AF_IPX, &conn->ncp_so, SOCK_DGRAM, 0, td->td_ucred, td));
  308                 if (conn->li.opt & NCP_OPT_WDOG)
  309                         checkbad(socreate(AF_IPX, &conn->wdg_so, SOCK_DGRAM, 0, td->td_ucred, td));
  310                 addrlen = sizeof(sipx);
  311                 sipx.sipx_family = AF_IPX;
  312                 ipx_setnullnet(sipx.sipx_addr);
  313                 ipx_setnullhost(sipx.sipx_addr);
  314                 sipx.sipx_len = addrlen;
  315                 error = sobind(conn->ncp_so, (struct sockaddr *)&sipx, td);
  316                 if (error == 0) {
  317                         if ((conn->li.opt & NCP_OPT_WDOG) == 0)
  318                                 break;
  319                         sipx.sipx_addr = sotoipxpcb(conn->ncp_so)->ipxp_laddr;
  320                         sipx.sipx_port = htons(ntohs(sipx.sipx_port) + 1);
  321                         ipx_setnullnet(sipx.sipx_addr);
  322                         ipx_setnullhost(sipx.sipx_addr);
  323                         error = sobind(conn->wdg_so, (struct sockaddr *)&sipx, td);
  324                 }
  325                 if (!error) break;
  326                 if (error != EADDRINUSE) goto bad;
  327                 sipx.sipx_port = htons((ntohs(sipx.sipx_port)+4) & 0xfff8);
  328                 soclose(conn->ncp_so);
  329                 if (conn->wdg_so)
  330                         soclose(conn->wdg_so);
  331         }
  332         npcb = sotoipxpcb(conn->ncp_so);
  333         npcb->ipxp_dpt = IPXPROTO_NCP;
  334         /* IPXrouted must be running, i.e. route must be presented */
  335         conn->li.ipxaddr.sipx_len = sizeof(struct sockaddr_ipx);
  336         checkbad(ncp_soconnect(conn->ncp_so, &conn->li.saddr, td));
  337         if (conn->wdg_so) {
  338                 sotoipxpcb(conn->wdg_so)->ipxp_laddr.x_net = npcb->ipxp_laddr.x_net;
  339                 sotoipxpcb(conn->wdg_so)->ipxp_laddr.x_host= npcb->ipxp_laddr.x_host;
  340         }
  341         if (!error) {
  342                 conn->flags |= NCPFL_SOCONN;
  343         }
  344 #ifdef NCPBURST
  345         if (ncp_burst_enabled) {
  346                 checkbad(socreate(AF_IPX, &conn->bc_so, SOCK_DGRAM, 0, td));
  347                 bzero(&sipx, sizeof(sipx));
  348                 sipx.sipx_len = sizeof(sipx);
  349                 checkbad(sobind(conn->bc_so, (struct sockaddr *)&sipx, td));
  350                 checkbad(ncp_soconnect(conn->bc_so, &conn->li.saddr, td));
  351         }
  352 #endif
  353         if (!error) {
  354                 conn->flags |= NCPFL_SOCONN;
  355                 ncp_sock_checksum(conn, 0);
  356         }
  357         return error;
  358 bad:
  359         ncp_sock_disconnect(conn);
  360         return (error);
  361 }
  362 
  363 int
  364 ncp_sock_checksum(struct ncp_conn *conn, int enable)
  365 {
  366 
  367         if (enable) {
  368                 sotoipxpcb(conn->ncp_so)->ipxp_flags |= IPXP_CHECKSUM;
  369         } else {
  370                 sotoipxpcb(conn->ncp_so)->ipxp_flags &= ~IPXP_CHECKSUM;
  371         }
  372         return 0;
  373 }
  374 
  375 /*
  376  * Connect to specified server via IP
  377  */
  378 static int
  379 ncp_sock_connect_in(struct ncp_conn *conn)
  380 {
  381         struct sockaddr_in sin;
  382         struct thread *td = conn->td;
  383         int addrlen = sizeof(sin), error;
  384 
  385         conn->flags = 0;
  386         bzero(&sin,addrlen);
  387         conn->ncp_so = conn->wdg_so = NULL;
  388         checkbad(socreate(AF_INET, &conn->ncp_so, SOCK_DGRAM, IPPROTO_UDP, td->td_ucred, td));
  389         sin.sin_family = AF_INET;
  390         sin.sin_len = addrlen;
  391         checkbad(sobind(conn->ncp_so, (struct sockaddr *)&sin, td));
  392         checkbad(ncp_soconnect(conn->ncp_so,(struct sockaddr*)&conn->li.addr, td));
  393         if  (!error)
  394                 conn->flags |= NCPFL_SOCONN;
  395         return error;
  396 bad:
  397         ncp_sock_disconnect(conn);
  398         return (error);
  399 }
  400 
  401 int
  402 ncp_sock_connect(struct ncp_conn *ncp)
  403 {
  404         int error;
  405 
  406         switch (ncp->li.saddr.sa_family) {
  407             case AF_IPX:
  408                 error = ncp_sock_connect_ipx(ncp);
  409                 break;
  410             case AF_INET:
  411                 error = ncp_sock_connect_in(ncp);
  412                 break;
  413             default:
  414                 return EPROTONOSUPPORT;
  415         }
  416         return error;
  417 }
  418 
  419 /*
  420  * Connection expected to be locked
  421  */
  422 int
  423 ncp_sock_disconnect(struct ncp_conn *conn) {
  424         register struct socket *so;
  425         conn->flags &= ~(NCPFL_SOCONN | NCPFL_ATTACHED | NCPFL_LOGGED);
  426         if (conn->ncp_so) {
  427                 so = conn->ncp_so;
  428                 conn->ncp_so = (struct socket *)0;
  429                 soshutdown(so, 2);
  430                 soclose(so);
  431         }
  432         if (conn->wdg_so) {
  433                 so = conn->wdg_so;
  434                 conn->wdg_so = (struct socket *)0;
  435                 soshutdown(so, 2);
  436                 soclose(so);
  437         }
  438 #ifdef NCPBURST
  439         if (conn->bc_so) {
  440                 so = conn->bc_so;
  441                 conn->bc_so = (struct socket *)NULL;
  442                 soshutdown(so, 2);
  443                 soclose(so);
  444         }
  445 #endif
  446         return 0;
  447 }
  448 
  449 static void
  450 ncp_watchdog(struct ncp_conn *conn) {
  451         char *buf;
  452         struct mbuf *m;
  453         int error, len, flags;
  454         struct socket *so;
  455         struct sockaddr *sa;
  456         struct uio auio;
  457 
  458         sa = NULL;
  459         while (conn->wdg_so) { /* not a loop */
  460                 so = conn->wdg_so;
  461                 auio.uio_resid = len = 1000000;
  462                 auio.uio_td = curthread;
  463                 flags = MSG_DONTWAIT;
  464                 error = soreceive(so, (struct sockaddr**)&sa, &auio, &m,
  465                     (struct mbuf**)0, &flags);
  466                 if (error) break;
  467                 len -= auio.uio_resid;
  468                 NCPSDEBUG("got watch dog %d\n",len);
  469                 if (len != 2) break;
  470                 buf = mtod(m, char*);
  471                 if (buf[1] != '?') break;
  472                 buf[1] = 'Y';
  473                 error = sosend(so, (struct sockaddr*)sa, 0, m, 0, 0, curthread);
  474                 NCPSDEBUG("send watch dog %d\n",error);
  475                 break;
  476         }
  477         if (sa) FREE(sa, M_SONAME);
  478         return;
  479 }
  480 
  481 void
  482 ncp_check_conn(struct ncp_conn *conn) {
  483         int s;
  484 
  485         if (conn == NULL || !(conn->flags & NCPFL_ATTACHED))
  486                 return;
  487         s = splnet();
  488         ncp_check_rq(conn);
  489         splx(s);
  490         if (conn->li.saddr.sa_family == AF_IPX)
  491                 ncp_watchdog(conn);
  492 }
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FreeBSD/Linux Kernel Cross Reference sys/netncp/ncp_sock.c

FreeBSD/Linux Kernel Cross Reference
sys/netncp/ncp_sock.c
