The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netipx/ipx_usrreq.c

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    1 /*-
    2  * Copyright (c) 1984, 1985, 1986, 1987, 1993
    3  *      The Regents of the University of California.
    4  * Copyright (c) 2004-2006 Robert N. M. Watson
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 4. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  * Copyright (c) 1995, Mike Mitchell
   32  * All rights reserved.
   33  *
   34  * Redistribution and use in source and binary forms, with or without
   35  * modification, are permitted provided that the following conditions
   36  * are met:
   37  * 1. Redistributions of source code must retain the above copyright
   38  *    notice, this list of conditions and the following disclaimer.
   39  * 2. Redistributions in binary form must reproduce the above copyright
   40  *    notice, this list of conditions and the following disclaimer in the
   41  *    documentation and/or other materials provided with the distribution.
   42  * 3. All advertising materials mentioning features or use of this software
   43  *    must display the following acknowledgement:
   44  *      This product includes software developed by the University of
   45  *      California, Berkeley and its contributors.
   46  * 4. Neither the name of the University nor the names of its contributors
   47  *    may be used to endorse or promote products derived from this software
   48  *    without specific prior written permission.
   49  *
   50  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   51  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   52  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   53  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   54  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   55  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   56  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   57  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   58  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   59  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   60  * SUCH DAMAGE.
   61  *
   62  *      @(#)ipx_usrreq.c
   63  */
   64 
   65 #include <sys/cdefs.h>
   66 __FBSDID("$FreeBSD: releng/7.4/sys/netipx/ipx_usrreq.c 188226 2009-02-06 12:20:08Z rwatson $");
   67 
   68 #include "opt_ipx.h"
   69 
   70 #include <sys/param.h>
   71 #include <sys/kernel.h>
   72 #include <sys/lock.h>
   73 #include <sys/mbuf.h>
   74 #include <sys/priv.h>
   75 #include <sys/protosw.h>
   76 #include <sys/signalvar.h>
   77 #include <sys/socket.h>
   78 #include <sys/socketvar.h>
   79 #include <sys/sx.h>
   80 #include <sys/sysctl.h>
   81 #include <sys/systm.h>
   82 
   83 #include <net/if.h>
   84 #include <net/route.h>
   85 
   86 #include <netinet/in.h>
   87 
   88 #include <netipx/ipx.h>
   89 #include <netipx/ipx_if.h>
   90 #include <netipx/ipx_pcb.h>
   91 #include <netipx/ipx_var.h>
   92 
   93 /*
   94  * IPX protocol implementation.
   95  */
   96 
   97 static int ipxsendspace = IPXSNDQ;
   98 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxsendspace, CTLFLAG_RW,
   99             &ipxsendspace, 0, "");
  100 static int ipxrecvspace = IPXRCVQ;
  101 SYSCTL_INT(_net_ipx_ipx, OID_AUTO, ipxrecvspace, CTLFLAG_RW,
  102             &ipxrecvspace, 0, "");
  103 
  104 static  void ipx_usr_abort(struct socket *so);
  105 static  int ipx_attach(struct socket *so, int proto, struct thread *td);
  106 static  int ipx_bind(struct socket *so, struct sockaddr *nam, struct thread *td);
  107 static  int ipx_connect(struct socket *so, struct sockaddr *nam,
  108                         struct thread *td);
  109 static  void ipx_detach(struct socket *so);
  110 static  int ipx_disconnect(struct socket *so);
  111 static  int ipx_send(struct socket *so, int flags, struct mbuf *m,
  112                      struct sockaddr *addr, struct mbuf *control,
  113                      struct thread *td);
  114 static  int ipx_shutdown(struct socket *so);
  115 static  int ripx_attach(struct socket *so, int proto, struct thread *td);
  116 static  int ipx_output(struct ipxpcb *ipxp, struct mbuf *m0);
  117 static  void ipx_usr_close(struct socket *so);
  118 
  119 struct  pr_usrreqs ipx_usrreqs = {
  120         .pru_abort =            ipx_usr_abort,
  121         .pru_attach =           ipx_attach,
  122         .pru_bind =             ipx_bind,
  123         .pru_connect =          ipx_connect,
  124         .pru_control =          ipx_control,
  125         .pru_detach =           ipx_detach,
  126         .pru_disconnect =       ipx_disconnect,
  127         .pru_peeraddr =         ipx_peeraddr,
  128         .pru_send =             ipx_send,
  129         .pru_shutdown =         ipx_shutdown,
  130         .pru_sockaddr =         ipx_sockaddr,
  131         .pru_close =            ipx_usr_close,
  132 };
  133 
  134 struct  pr_usrreqs ripx_usrreqs = {
  135         .pru_abort =            ipx_usr_abort,
  136         .pru_attach =           ripx_attach,
  137         .pru_bind =             ipx_bind,
  138         .pru_connect =          ipx_connect,
  139         .pru_control =          ipx_control,
  140         .pru_detach =           ipx_detach,
  141         .pru_disconnect =       ipx_disconnect,
  142         .pru_peeraddr =         ipx_peeraddr,
  143         .pru_send =             ipx_send,
  144         .pru_shutdown =         ipx_shutdown,
  145         .pru_sockaddr =         ipx_sockaddr,
  146         .pru_close =            ipx_usr_close,
  147 };
  148 
  149 /*
  150  *  This may also be called for raw listeners.
  151  */
  152 void
  153 ipx_input(struct mbuf *m, struct ipxpcb *ipxp)
  154 {
  155         struct ipx *ipx = mtod(m, struct ipx *);
  156         struct ifnet *ifp = m->m_pkthdr.rcvif;
  157         struct sockaddr_ipx ipx_ipx;
  158 
  159         KASSERT(ipxp != NULL, ("ipx_input: NULL ipxpcb"));
  160         IPX_LOCK_ASSERT(ipxp);
  161         /*
  162          * Construct sockaddr format source address.
  163          * Stuff source address and datagram in user buffer.
  164          */
  165         ipx_ipx.sipx_len = sizeof(ipx_ipx);
  166         ipx_ipx.sipx_family = AF_IPX;
  167         ipx_ipx.sipx_addr = ipx->ipx_sna;
  168         ipx_ipx.sipx_zero[0] = '\0';
  169         ipx_ipx.sipx_zero[1] = '\0';
  170         if (ipx_neteqnn(ipx->ipx_sna.x_net, ipx_zeronet) && ifp != NULL) {
  171                 struct ifaddr *ifa;
  172 
  173                 for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa != NULL;
  174                      ifa = TAILQ_NEXT(ifa, ifa_link)) {
  175                         if (ifa->ifa_addr->sa_family == AF_IPX) {
  176                                 ipx_ipx.sipx_addr.x_net =
  177                                         IA_SIPX(ifa)->sipx_addr.x_net;
  178                                 break;
  179                         }
  180                 }
  181         }
  182         ipxp->ipxp_rpt = ipx->ipx_pt;
  183         if ((ipxp->ipxp_flags & IPXP_RAWIN) == 0) {
  184                 m->m_len -= sizeof(struct ipx);
  185                 m->m_pkthdr.len -= sizeof(struct ipx);
  186                 m->m_data += sizeof(struct ipx);
  187         }
  188         if (sbappendaddr(&ipxp->ipxp_socket->so_rcv,
  189             (struct sockaddr *)&ipx_ipx, m, NULL) == 0)
  190                 m_freem(m);
  191         else
  192                 sorwakeup(ipxp->ipxp_socket);
  193 }
  194 
  195 /*
  196  * Drop connection, reporting
  197  * the specified error.
  198  */
  199 void
  200 ipx_drop(struct ipxpcb *ipxp, int errno)
  201 {
  202         struct socket *so = ipxp->ipxp_socket;
  203 
  204         IPX_LIST_LOCK_ASSERT();
  205         IPX_LOCK_ASSERT(ipxp);
  206 
  207         /*
  208          * someday, in the IPX world
  209          * we will generate error protocol packets
  210          * announcing that the socket has gone away.
  211          *
  212          * XXX Probably never. IPX does not have error packets.
  213          */
  214         /*if (TCPS_HAVERCVDSYN(tp->t_state)) {
  215                 tp->t_state = TCPS_CLOSED;
  216                 tcp_output(tp);
  217         }*/
  218         so->so_error = errno;
  219         ipx_pcbdisconnect(ipxp);
  220         soisdisconnected(so);
  221 }
  222 
  223 static int
  224 ipx_output(struct ipxpcb *ipxp, struct mbuf *m0)
  225 {
  226         struct ipx *ipx;
  227         struct socket *so;
  228         int len = 0;
  229         struct route *ro;
  230         struct mbuf *m;
  231         struct mbuf *mprev = NULL;
  232 
  233         IPX_LOCK_ASSERT(ipxp);
  234 
  235         /*
  236          * Calculate data length.
  237          */
  238         for (m = m0; m != NULL; m = m->m_next) {
  239                 mprev = m;
  240                 len += m->m_len;
  241         }
  242         /*
  243          * Make sure packet is actually of even length.
  244          */
  245 
  246         if (len & 1) {
  247                 m = mprev;
  248                 if ((m->m_flags & M_EXT) == 0 &&
  249                         (m->m_len + m->m_data < &m->m_dat[MLEN])) {
  250                         mtod(m, char*)[m->m_len++] = 0;
  251                 } else {
  252                         struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA);
  253 
  254                         if (m1 == NULL) {
  255                                 m_freem(m0);
  256                                 return (ENOBUFS);
  257                         }
  258                         m1->m_len = 1;
  259                         * mtod(m1, char *) = 0;
  260                         m->m_next = m1;
  261                 }
  262                 m0->m_pkthdr.len++;
  263         }
  264 
  265         /*
  266          * Fill in mbuf with extended IPX header
  267          * and addresses and length put into network format.
  268          */
  269         m = m0;
  270         if (ipxp->ipxp_flags & IPXP_RAWOUT) {
  271                 ipx = mtod(m, struct ipx *);
  272         } else {
  273                 M_PREPEND(m, sizeof(struct ipx), M_DONTWAIT);
  274                 if (m == NULL)
  275                         return (ENOBUFS);
  276                 ipx = mtod(m, struct ipx *);
  277                 ipx->ipx_tc = 0;
  278                 ipx->ipx_pt = ipxp->ipxp_dpt;
  279                 ipx->ipx_sna = ipxp->ipxp_laddr;
  280                 ipx->ipx_dna = ipxp->ipxp_faddr;
  281                 len += sizeof(struct ipx);
  282         }
  283 
  284         ipx->ipx_len = htons((u_short)len);
  285 
  286         if (ipxp->ipxp_flags & IPXP_CHECKSUM) {
  287                 ipx->ipx_sum = ipx_cksum(m, len);
  288         } else
  289                 ipx->ipx_sum = 0xffff;
  290 
  291         /*
  292          * Output datagram.
  293          */
  294         so = ipxp->ipxp_socket;
  295         if (so->so_options & SO_DONTROUTE)
  296                 return (ipx_outputfl(m, (struct route *)NULL,
  297                     (so->so_options & SO_BROADCAST) | IPX_ROUTETOIF));
  298         /*
  299          * Use cached route for previous datagram if
  300          * possible.  If the previous net was the same
  301          * and the interface was a broadcast medium, or
  302          * if the previous destination was identical,
  303          * then we are ok.
  304          *
  305          * NB: We don't handle broadcasts because that
  306          *     would require 3 subroutine calls.
  307          */
  308         ro = &ipxp->ipxp_route;
  309 #ifdef ancient_history
  310         /*
  311          * I think that this will all be handled in ipx_pcbconnect!
  312          */
  313         if (ro->ro_rt != NULL) {
  314                 if(ipx_neteq(ipxp->ipxp_lastdst, ipx->ipx_dna)) {
  315                         /*
  316                          * This assumes we have no GH type routes
  317                          */
  318                         if (ro->ro_rt->rt_flags & RTF_HOST) {
  319                                 if (!ipx_hosteq(ipxp->ipxp_lastdst, ipx->ipx_dna))
  320                                         goto re_route;
  321 
  322                         }
  323                         if ((ro->ro_rt->rt_flags & RTF_GATEWAY) == 0) {
  324                                 struct ipx_addr *dst =
  325                                                 &satoipx_addr(ro->ro_dst);
  326                                 dst->x_host = ipx->ipx_dna.x_host;
  327                         }
  328                         /*
  329                          * Otherwise, we go through the same gateway
  330                          * and dst is already set up.
  331                          */
  332                 } else {
  333                 re_route:
  334                         RTFREE(ro->ro_rt);
  335                         ro->ro_rt = NULL;
  336                 }
  337         }
  338         ipxp->ipxp_lastdst = ipx->ipx_dna;
  339 #endif /* ancient_history */
  340         return (ipx_outputfl(m, ro, so->so_options & SO_BROADCAST));
  341 }
  342 
  343 int
  344 ipx_ctloutput(struct socket *so, struct sockopt *sopt)
  345 {
  346         struct ipxpcb *ipxp = sotoipxpcb(so);
  347         int mask, error, optval;
  348         short soptval;
  349         struct ipx ioptval;
  350         long seq;
  351 
  352         KASSERT(ipxp != NULL, ("ipx_ctloutput: ipxp == NULL"));
  353         error = 0;
  354 
  355         switch (sopt->sopt_dir) {
  356         case SOPT_GET:
  357                 switch (sopt->sopt_name) {
  358                 case SO_ALL_PACKETS:
  359                         mask = IPXP_ALL_PACKETS;
  360                         goto get_flags;
  361 
  362                 case SO_HEADERS_ON_INPUT:
  363                         mask = IPXP_RAWIN;
  364                         goto get_flags;
  365 
  366                 case SO_IPX_CHECKSUM:
  367                         mask = IPXP_CHECKSUM;
  368                         goto get_flags;
  369 
  370                 case SO_HEADERS_ON_OUTPUT:
  371                         mask = IPXP_RAWOUT;
  372                 get_flags:
  373                         /* Unlocked read. */
  374                         soptval = ipxp->ipxp_flags & mask;
  375                         error = sooptcopyout(sopt, &soptval, sizeof soptval);
  376                         break;
  377 
  378                 case SO_DEFAULT_HEADERS:
  379                         ioptval.ipx_len = 0;
  380                         ioptval.ipx_sum = 0;
  381                         ioptval.ipx_tc = 0;
  382                         IPX_LOCK(ipxp);
  383                         ioptval.ipx_pt = ipxp->ipxp_dpt;
  384                         ioptval.ipx_dna = ipxp->ipxp_faddr;
  385                         ioptval.ipx_sna = ipxp->ipxp_laddr;
  386                         IPX_UNLOCK(ipxp);
  387                         error = sooptcopyout(sopt, &soptval, sizeof soptval);
  388                         break;
  389 
  390                 case SO_SEQNO:
  391                         IPX_LIST_LOCK();
  392                         seq = ipx_pexseq;
  393                         ipx_pexseq++;
  394                         IPX_LIST_UNLOCK();
  395                         error = sooptcopyout(sopt, &seq, sizeof seq);
  396                         break;
  397 
  398                 default:
  399                         error = EINVAL;
  400                 }
  401                 break;
  402 
  403         case SOPT_SET:
  404                 switch (sopt->sopt_name) {
  405                 case SO_ALL_PACKETS:
  406                         mask = IPXP_ALL_PACKETS;
  407                         goto set_head;
  408 
  409                 case SO_HEADERS_ON_INPUT:
  410                         mask = IPXP_RAWIN;
  411                         goto set_head;
  412 
  413                 case SO_IPX_CHECKSUM:
  414                         mask = IPXP_CHECKSUM;
  415                         goto set_head;
  416 
  417                 case SO_HEADERS_ON_OUTPUT:
  418                         mask = IPXP_RAWOUT;
  419                 set_head:
  420                         error = sooptcopyin(sopt, &optval, sizeof optval,
  421                                             sizeof optval);
  422                         if (error)
  423                                 break;
  424                         IPX_LOCK(ipxp);
  425                         if (optval)
  426                                 ipxp->ipxp_flags |= mask;
  427                         else
  428                                 ipxp->ipxp_flags &= ~mask;
  429                         IPX_UNLOCK(ipxp);
  430                         break;
  431 
  432                 case SO_DEFAULT_HEADERS:
  433                         error = sooptcopyin(sopt, &ioptval, sizeof ioptval,
  434                                             sizeof ioptval);
  435                         if (error)
  436                                 break;
  437                         /* Unlocked write. */
  438                         ipxp->ipxp_dpt = ioptval.ipx_pt;
  439                         break;
  440                 default:
  441                         error = EINVAL;
  442                 }
  443                 break;
  444         }
  445         return (error);
  446 }
  447 
  448 static void
  449 ipx_usr_abort(struct socket *so)
  450 {
  451 
  452         /* XXXRW: Possibly ipx_disconnect() here? */
  453         soisdisconnected(so);
  454 }
  455 
  456 static int
  457 ipx_attach(struct socket *so, int proto, struct thread *td)
  458 {
  459 #ifdef INVARIANTS
  460         struct ipxpcb *ipxp = sotoipxpcb(so);
  461 #endif
  462         int error;
  463 
  464         KASSERT(ipxp == NULL, ("ipx_attach: ipxp != NULL"));
  465         error = soreserve(so, ipxsendspace, ipxrecvspace);
  466         if (error != 0)
  467                 return (error);
  468         IPX_LIST_LOCK();
  469         error = ipx_pcballoc(so, &ipxpcb_list, td);
  470         IPX_LIST_UNLOCK();
  471         return (error);
  472 }
  473 
  474 static int
  475 ipx_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
  476 {
  477         struct ipxpcb *ipxp = sotoipxpcb(so);
  478         int error;
  479 
  480         KASSERT(ipxp != NULL, ("ipx_bind: ipxp == NULL"));
  481         IPX_LIST_LOCK();
  482         IPX_LOCK(ipxp);
  483         error = ipx_pcbbind(ipxp, nam, td);
  484         IPX_UNLOCK(ipxp);
  485         IPX_LIST_UNLOCK();
  486         return (error);
  487 }
  488 
  489 static void
  490 ipx_usr_close(struct socket *so)
  491 {
  492 
  493         /* XXXRW: Possibly ipx_disconnect() here? */
  494         soisdisconnected(so);
  495 }
  496 
  497 static int
  498 ipx_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
  499 {
  500         struct ipxpcb *ipxp = sotoipxpcb(so);
  501         int error;
  502 
  503         KASSERT(ipxp != NULL, ("ipx_connect: ipxp == NULL"));
  504         IPX_LIST_LOCK();
  505         IPX_LOCK(ipxp);
  506         if (!ipx_nullhost(ipxp->ipxp_faddr)) {
  507                 error = EISCONN;
  508                 goto out;
  509         }
  510         error = ipx_pcbconnect(ipxp, nam, td);
  511         if (error == 0)
  512                 soisconnected(so);
  513 out:
  514         IPX_UNLOCK(ipxp);
  515         IPX_LIST_UNLOCK();
  516         return (error);
  517 }
  518 
  519 static void
  520 ipx_detach(struct socket *so)
  521 {
  522         struct ipxpcb *ipxp = sotoipxpcb(so);
  523 
  524         /* XXXRW: Should assert detached. */
  525         KASSERT(ipxp != NULL, ("ipx_detach: ipxp == NULL"));
  526         IPX_LIST_LOCK();
  527         IPX_LOCK(ipxp);
  528         ipx_pcbdetach(ipxp);
  529         ipx_pcbfree(ipxp);
  530         IPX_LIST_UNLOCK();
  531 }
  532 
  533 static int
  534 ipx_disconnect(struct socket *so)
  535 {
  536         struct ipxpcb *ipxp = sotoipxpcb(so);
  537         int error;
  538 
  539         KASSERT(ipxp != NULL, ("ipx_disconnect: ipxp == NULL"));
  540         IPX_LIST_LOCK();
  541         IPX_LOCK(ipxp);
  542         error = 0;
  543         if (ipx_nullhost(ipxp->ipxp_faddr)) {
  544                 error = ENOTCONN;
  545                 goto out;
  546         }
  547         ipx_pcbdisconnect(ipxp);
  548         soisdisconnected(so);
  549 out:
  550         IPX_UNLOCK(ipxp);
  551         IPX_LIST_UNLOCK();
  552         return (0);
  553 }
  554 
  555 int
  556 ipx_peeraddr(struct socket *so, struct sockaddr **nam)
  557 {
  558         struct ipxpcb *ipxp = sotoipxpcb(so);
  559 
  560         KASSERT(ipxp != NULL, ("ipx_peeraddr: ipxp == NULL"));
  561         ipx_getpeeraddr(ipxp, nam);
  562         return (0);
  563 }
  564 
  565 static int
  566 ipx_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
  567     struct mbuf *control, struct thread *td)
  568 {
  569         int error;
  570         struct ipxpcb *ipxp = sotoipxpcb(so);
  571         struct ipx_addr laddr;
  572 
  573         KASSERT(ipxp != NULL, ("ipxp_send: ipxp == NULL"));
  574         /*
  575          * Attempt to only acquire the necessary locks: if the socket is
  576          * already connected, we don't need to hold the IPX list lock to be
  577          * used by ipx_pcbconnect() and ipx_pcbdisconnect(), just the IPX
  578          * pcb lock.
  579          */
  580         if (nam != NULL) {
  581                 IPX_LIST_LOCK();
  582                 IPX_LOCK(ipxp);
  583                 laddr = ipxp->ipxp_laddr;
  584                 if (!ipx_nullhost(ipxp->ipxp_faddr)) {
  585                         IPX_UNLOCK(ipxp);
  586                         IPX_LIST_UNLOCK();
  587                         error = EISCONN;
  588                         goto send_release;
  589                 }
  590                 /*
  591                  * Must block input while temporarily connected.
  592                  */
  593                 error = ipx_pcbconnect(ipxp, nam, td);
  594                 if (error) {
  595                         IPX_UNLOCK(ipxp);
  596                         IPX_LIST_UNLOCK();
  597                         goto send_release;
  598                 }
  599         } else {
  600                 IPX_LOCK(ipxp);
  601                 if (ipx_nullhost(ipxp->ipxp_faddr)) {
  602                         IPX_UNLOCK(ipxp);
  603                         error = ENOTCONN;
  604                         goto send_release;
  605                 }
  606         }
  607         error = ipx_output(ipxp, m);
  608         m = NULL;
  609         if (nam != NULL) {
  610                 ipx_pcbdisconnect(ipxp);
  611                 ipxp->ipxp_laddr = laddr;
  612                 IPX_UNLOCK(ipxp);
  613                 IPX_LIST_UNLOCK();
  614         } else
  615                 IPX_UNLOCK(ipxp);
  616 
  617 send_release:
  618         if (m != NULL)
  619                 m_freem(m);
  620         return (error);
  621 }
  622 
  623 static int
  624 ipx_shutdown(so)
  625         struct socket *so;
  626 {
  627 
  628         KASSERT(so->so_pcb != NULL, ("ipx_shutdown: so_pcb == NULL"));
  629         socantsendmore(so);
  630         return (0);
  631 }
  632 
  633 int
  634 ipx_sockaddr(struct socket *so, struct sockaddr **nam)
  635 {
  636         struct ipxpcb *ipxp = sotoipxpcb(so);
  637 
  638         KASSERT(ipxp != NULL, ("ipx_sockaddr: ipxp == NULL"));
  639         ipx_getsockaddr(ipxp, nam);
  640         return (0);
  641 }
  642 
  643 static int
  644 ripx_attach(struct socket *so, int proto, struct thread *td)
  645 {
  646         int error = 0;
  647         struct ipxpcb *ipxp = sotoipxpcb(so);
  648 
  649         KASSERT(ipxp == NULL, ("ripx_attach: ipxp != NULL"));
  650 
  651         if (td != NULL) {
  652                 error = priv_check(td, PRIV_NETIPX_RAW);
  653                 if (error)
  654                         return (error);
  655         }
  656 
  657         /*
  658          * We hold the IPX list lock for the duration as address parameters
  659          * of the IPX pcb are changed.  Since no one else holds a reference
  660          * to the ipxpcb yet, we don't need the ipxpcb lock here.
  661          */
  662         IPX_LIST_LOCK();
  663         error = ipx_pcballoc(so, &ipxrawpcb_list, td);
  664         if (error)
  665                 goto out;
  666         ipxp = sotoipxpcb(so);
  667         error = soreserve(so, ipxsendspace, ipxrecvspace);
  668         if (error)
  669                 goto out;
  670         ipxp->ipxp_faddr.x_host = ipx_broadhost;
  671         ipxp->ipxp_flags = IPXP_RAWIN | IPXP_RAWOUT;
  672 out:
  673         IPX_LIST_UNLOCK();
  674         return (error);
  675 }

Cache object: ecfddac2fb43dfb4b073b8085c0652c0


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