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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sys/netnatm/natm.c

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    1 /*-
    2  * Copyright (c) 2005-2006 Robert N. M. Watson
    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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * Copyright (c) 1996 Charles D. Cranor and Washington University.
   27  * All rights reserved.
   28  *
   29  * Redistribution and use in source and binary forms, with or without
   30  * modification, are permitted provided that the following conditions
   31  * are met:
   32  * 1. Redistributions of source code must retain the above copyright
   33  *    notice, this list of conditions and the following disclaimer.
   34  * 2. Redistributions in binary form must reproduce the above copyright
   35  *    notice, this list of conditions and the following disclaimer in the
   36  *    documentation and/or other materials provided with the distribution.
   37  * 3. All advertising materials mentioning features or use of this software
   38  *    must display the following acknowledgement:
   39  *      This product includes software developed by Charles D. Cranor and
   40  *      Washington University.
   41  * 4. The name of the author may not be used to endorse or promote products
   42  *    derived from this software without specific prior written permission.
   43  *
   44  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   45  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   46  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   47  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   48  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   49  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   53  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   54  *
   55  * $NetBSD: natm.c,v 1.5 1996/11/09 03:26:26 chuck Exp $
   56  */
   57 
   58 /*
   59  * natm.c: Native mode ATM access (both aal0 and aal5).
   60  */
   61 
   62 #include <sys/cdefs.h>
   63 __FBSDID("$FreeBSD$");
   64 
   65 #include <sys/param.h>
   66 #include <sys/conf.h>
   67 #include <sys/kernel.h>
   68 #include <sys/lock.h>
   69 #include <sys/malloc.h>
   70 #include <sys/mbuf.h>
   71 #include <sys/protosw.h>
   72 #include <sys/signalvar.h>
   73 #include <sys/socket.h>
   74 #include <sys/socketvar.h>
   75 #include <sys/sockio.h>
   76 #include <sys/sx.h>
   77 #include <sys/systm.h>
   78 #include <sys/sysctl.h>
   79 
   80 #include <net/if.h>
   81 #include <net/if_atm.h>
   82 #include <net/netisr.h>
   83 
   84 #include <netinet/in.h>
   85 
   86 #include <netnatm/natm.h>
   87 
   88 static const u_long     natm5_sendspace = 16*1024;
   89 static const u_long     natm5_recvspace = 16*1024;
   90 
   91 static const u_long     natm0_sendspace = 16*1024;
   92 static const u_long     natm0_recvspace = 16*1024;
   93 
   94 /*
   95  * netnatm global subsystem lock, protects all global data structures in
   96  * netnatm.
   97  */
   98 struct mtx      natm_mtx;
   99 
  100 /*
  101  * User socket requests.
  102  */
  103 static int      natm_usr_attach(struct socket *, int, d_thread_t *);
  104 static void     natm_usr_detach(struct socket *);
  105 static int      natm_usr_connect(struct socket *, struct sockaddr *,
  106                     d_thread_t *);
  107 static int      natm_usr_disconnect(struct socket *);
  108 static int      natm_usr_shutdown(struct socket *);
  109 static int      natm_usr_send(struct socket *, int, struct mbuf *,
  110                     struct sockaddr *, struct mbuf *, d_thread_t *);
  111 static int      natm_usr_peeraddr(struct socket *, struct sockaddr **);
  112 static int      natm_usr_control(struct socket *, u_long, caddr_t,
  113                     struct ifnet *, d_thread_t *);
  114 static void     natm_usr_abort(struct socket *);
  115 static int      natm_usr_bind(struct socket *, struct sockaddr *,
  116                     d_thread_t *);
  117 static int      natm_usr_sockaddr(struct socket *, struct sockaddr **);
  118 
  119 static int
  120 natm_usr_attach(struct socket *so, int proto, d_thread_t *p)
  121 {
  122         struct natmpcb *npcb;
  123         int error = 0;
  124 
  125         npcb = (struct natmpcb *)so->so_pcb;
  126         KASSERT(npcb == NULL, ("natm_usr_attach: so_pcb != NULL"));
  127 
  128         if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
  129                 if (proto == PROTO_NATMAAL5) 
  130                         error = soreserve(so, natm5_sendspace,
  131                             natm5_recvspace);
  132                 else
  133                         error = soreserve(so, natm0_sendspace,
  134                             natm0_recvspace);
  135                 if (error)
  136                         return (error);
  137         }
  138         so->so_pcb = npcb = npcb_alloc(M_WAITOK);
  139         npcb->npcb_socket = so;
  140         return (error);
  141 }
  142 
  143 static void
  144 natm_usr_detach(struct socket *so)
  145 {
  146         struct natmpcb *npcb;
  147 
  148         npcb = (struct natmpcb *)so->so_pcb;
  149         KASSERT(npcb != NULL, ("natm_usr_detach: npcb == NULL"));
  150 
  151         NATM_LOCK();
  152         npcb_free(npcb, NPCB_DESTROY);  /* drain */
  153         so->so_pcb = NULL;
  154         NATM_UNLOCK();
  155 }
  156 
  157 static int
  158 natm_usr_connect(struct socket *so, struct sockaddr *nam, d_thread_t *p)
  159 {
  160         struct natmpcb *npcb;
  161         struct sockaddr_natm *snatm;
  162         struct atmio_openvcc op;
  163         struct ifnet *ifp;
  164         int error = 0;
  165         int proto = so->so_proto->pr_protocol;
  166 
  167         npcb = (struct natmpcb *)so->so_pcb;
  168         KASSERT(npcb != NULL, ("natm_usr_connect: npcb == NULL"));
  169 
  170         /*
  171          * Validate nam and npcb.
  172          */
  173         NATM_LOCK();
  174         snatm = (struct sockaddr_natm *)nam;
  175         if (snatm->snatm_len != sizeof(*snatm) ||
  176                 (npcb->npcb_flags & NPCB_FREE) == 0) {
  177                 NATM_UNLOCK();
  178                 return (EINVAL);
  179         }
  180         if (snatm->snatm_family != AF_NATM) {
  181                 NATM_UNLOCK();
  182                 return (EAFNOSUPPORT);
  183         }
  184 
  185         snatm->snatm_if[IFNAMSIZ - 1] = '\0';   /* XXX ensure null termination
  186                                                    since ifunit() uses strcmp */
  187 
  188         /*
  189          * Convert interface string to ifp, validate.
  190          */
  191         ifp = ifunit(snatm->snatm_if);
  192         if (ifp == NULL || (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
  193                 NATM_UNLOCK();
  194                 return (ENXIO);
  195         }
  196         if (ifp->if_output != atm_output) {
  197                 NATM_UNLOCK();
  198                 return (EAFNOSUPPORT);
  199         }
  200 
  201         /*
  202          * Register us with the NATM PCB layer.
  203          */
  204         if (npcb_add(npcb, ifp, snatm->snatm_vci, snatm->snatm_vpi) != npcb) {
  205                 NATM_UNLOCK();
  206                 return (EADDRINUSE);
  207         }
  208 
  209         /*
  210          * Open the channel.
  211          *
  212          * XXXRW: Eventually desirable to hold mutex over ioctl?
  213          */
  214         bzero(&op, sizeof(op));
  215         op.rxhand = npcb;
  216         op.param.flags = ATMIO_FLAG_PVC;
  217         op.param.vpi = npcb->npcb_vpi;
  218         op.param.vci = npcb->npcb_vci;
  219         op.param.rmtu = op.param.tmtu = ifp->if_mtu;
  220         op.param.aal = (proto == PROTO_NATMAAL5) ? ATMIO_AAL_5 : ATMIO_AAL_0;
  221         op.param.traffic = ATMIO_TRAFFIC_UBR;
  222         NATM_UNLOCK();
  223 
  224         IFF_LOCKGIANT(ifp);
  225         if (ifp->if_ioctl == NULL || 
  226             ifp->if_ioctl(ifp, SIOCATMOPENVCC, (caddr_t)&op) != 0) {
  227                 IFF_UNLOCKGIANT(ifp);
  228                 return (EIO);
  229         }
  230         IFF_UNLOCKGIANT(ifp);
  231         soisconnected(so);
  232         return (error);
  233 }
  234 
  235 static int
  236 natm_usr_disconnect(struct socket *so)
  237 {
  238         struct natmpcb *npcb;
  239         struct atmio_closevcc cl;
  240         struct ifnet *ifp;
  241         int error = 0;
  242 
  243         npcb = (struct natmpcb *)so->so_pcb;
  244         KASSERT(npcb != NULL, ("natm_usr_disconnect: npcb == NULL"));
  245 
  246         NATM_LOCK();
  247         if ((npcb->npcb_flags & NPCB_CONNECTED) == 0) {
  248                 NATM_UNLOCK();
  249                 printf("natm: disconnected check\n");
  250                 return (EIO);
  251         }
  252         ifp = npcb->npcb_ifp;
  253 
  254         /*
  255          * Disable rx.
  256          *
  257          * XXXRW: Eventually desirable to hold mutex over ioctl?
  258          */
  259         cl.vpi = npcb->npcb_vpi;
  260         cl.vci = npcb->npcb_vci;
  261         NATM_UNLOCK();
  262         if (ifp->if_ioctl != NULL) {
  263                 IFF_LOCKGIANT(ifp);
  264                 ifp->if_ioctl(ifp, SIOCATMCLOSEVCC, (caddr_t)&cl);
  265                 IFF_UNLOCKGIANT(ifp);
  266         }
  267         soisdisconnected(so);
  268         return (error);
  269 }
  270 
  271 static int
  272 natm_usr_shutdown(struct socket *so)
  273 {
  274 
  275         socantsendmore(so);
  276         return (0);
  277 }
  278 
  279 static int
  280 natm_usr_send(struct socket *so, int flags, struct mbuf *m, 
  281         struct sockaddr *nam, struct mbuf *control, d_thread_t *p)
  282 {
  283         struct natmpcb *npcb;
  284         struct atm_pseudohdr *aph;
  285         int error = 0;
  286         int proto = so->so_proto->pr_protocol;
  287 
  288         npcb = (struct natmpcb *)so->so_pcb;
  289         KASSERT(npcb != NULL, ("natm_usr_send: npcb == NULL"));
  290 
  291         NATM_LOCK();
  292         if (control && control->m_len) {
  293                 NATM_UNLOCK();
  294                 m_freem(control);
  295                 m_freem(m);
  296                 return (EINVAL);
  297         }
  298 
  299         /*
  300          * Send the data.  We must put an atm_pseudohdr on first.
  301          */
  302         M_PREPEND(m, sizeof(*aph), M_DONTWAIT);
  303         if (m == NULL) {
  304                 NATM_UNLOCK();
  305                 m_freem(control);
  306                 return (ENOBUFS);
  307         }
  308         aph = mtod(m, struct atm_pseudohdr *);
  309         ATM_PH_VPI(aph) = npcb->npcb_vpi;
  310         ATM_PH_SETVCI(aph, npcb->npcb_vci);
  311         ATM_PH_FLAGS(aph) = (proto == PROTO_NATMAAL5) ? ATM_PH_AAL5 : 0;
  312         error = atm_output(npcb->npcb_ifp, m, NULL, NULL);
  313         NATM_UNLOCK();
  314         return (error);
  315 }
  316 
  317 static int
  318 natm_usr_peeraddr(struct socket *so, struct sockaddr **nam)
  319 {
  320         struct natmpcb *npcb;
  321         struct sockaddr_natm *snatm, ssnatm;
  322 
  323         npcb = (struct natmpcb *)so->so_pcb;
  324         KASSERT(npcb != NULL, ("natm_usr_peeraddr: npcb == NULL"));
  325 
  326         NATM_LOCK();
  327         snatm = &ssnatm;
  328         bzero(snatm, sizeof(*snatm));
  329         snatm->snatm_len = sizeof(*snatm);
  330         snatm->snatm_family = AF_NATM;
  331         strlcpy(snatm->snatm_if, npcb->npcb_ifp->if_xname,
  332             sizeof(snatm->snatm_if));
  333         snatm->snatm_vci = npcb->npcb_vci;
  334         snatm->snatm_vpi = npcb->npcb_vpi;
  335         NATM_UNLOCK();
  336         *nam = sodupsockaddr((struct sockaddr *)snatm, M_WAITOK);
  337         return (0);
  338 }
  339 
  340 static int
  341 natm_usr_control(struct socket *so, u_long cmd, caddr_t arg,
  342         struct ifnet *ifp, d_thread_t *p)
  343 {
  344         struct natmpcb *npcb;
  345         int error;
  346 
  347         npcb = (struct natmpcb *)so->so_pcb;
  348         KASSERT(npcb != NULL, ("natm_usr_control: npcb == NULL"));
  349 
  350         if (ifp == NULL || ifp->if_ioctl == NULL)
  351                 return (EOPNOTSUPP);
  352         IFF_LOCKGIANT(ifp);
  353         error = ((*ifp->if_ioctl)(ifp, cmd, arg));
  354         IFF_UNLOCKGIANT(ifp);
  355         return (error);
  356 }
  357 
  358 static void
  359 natm_usr_abort(struct socket *so)
  360 {
  361 
  362 }
  363 
  364 static void
  365 natm_usr_close(struct socket *so)
  366 {
  367 
  368 }
  369 
  370 static int
  371 natm_usr_bind(struct socket *so, struct sockaddr *nam, d_thread_t *p)
  372 {
  373 
  374         return (EOPNOTSUPP);
  375 }
  376 
  377 static int
  378 natm_usr_sockaddr(struct socket *so, struct sockaddr **nam)
  379 {
  380 
  381         return (EOPNOTSUPP);
  382 }
  383 
  384 /* xxx - should be const */
  385 struct pr_usrreqs natm_usrreqs = {
  386         .pru_abort =            natm_usr_abort,
  387         .pru_attach =           natm_usr_attach,
  388         .pru_bind =             natm_usr_bind,
  389         .pru_connect =          natm_usr_connect,
  390         .pru_control =          natm_usr_control,
  391         .pru_detach =           natm_usr_detach,
  392         .pru_disconnect =       natm_usr_disconnect,
  393         .pru_peeraddr =         natm_usr_peeraddr,
  394         .pru_send =             natm_usr_send,
  395         .pru_shutdown =         natm_usr_shutdown,
  396         .pru_sockaddr =         natm_usr_sockaddr,
  397         .pru_close =            natm_usr_close,
  398 };
  399 
  400 /*
  401  * natmintr: interrupt
  402  *
  403  * Note: we expect a socket pointer in rcvif rather than an interface
  404  * pointer.  We can get the interface pointer from the so's PCB if we really
  405  * need it.
  406  */
  407 void
  408 natmintr(struct mbuf *m)
  409 {
  410         struct socket *so;
  411         struct natmpcb *npcb;
  412 
  413 #ifdef DIAGNOSTIC
  414         M_ASSERTPKTHDR(m);
  415 #endif
  416 
  417         NATM_LOCK();
  418         npcb = (struct natmpcb *)m->m_pkthdr.rcvif;     /* XXX: overloaded */
  419         so = npcb->npcb_socket;
  420 
  421         npcb->npcb_inq--;
  422 
  423         if (npcb->npcb_flags & NPCB_DRAIN) {
  424                 if (npcb->npcb_inq == 0)
  425                         FREE(npcb, M_PCB);                      /* done! */
  426                 NATM_UNLOCK();
  427                 m_freem(m);
  428                 return;
  429         }
  430 
  431         if (npcb->npcb_flags & NPCB_FREE) {
  432                 NATM_UNLOCK();
  433                 m_freem(m);                                     /* drop */
  434                 return;
  435         }
  436 
  437 #ifdef NEED_TO_RESTORE_IFP
  438         m->m_pkthdr.rcvif = npcb->npcb_ifp;
  439 #else
  440 #ifdef DIAGNOSTIC
  441         m->m_pkthdr.rcvif = NULL;       /* null it out to be safe */
  442 #endif
  443 #endif
  444 
  445         if (sbspace(&so->so_rcv) > m->m_pkthdr.len) {
  446 #ifdef NATM_STAT
  447                 natm_sookcnt++;
  448                 natm_sookbytes += m->m_pkthdr.len;
  449 #endif
  450                 sbappendrecord(&so->so_rcv, m);
  451                 sorwakeup(so);
  452                 NATM_UNLOCK();
  453         } else {
  454 #ifdef NATM_STAT
  455                 natm_sodropcnt++;
  456                 natm_sodropbytes += m->m_pkthdr.len;
  457 #endif
  458                 NATM_UNLOCK();
  459                 m_freem(m);
  460         }
  461 }
  462 
  463 /* 
  464  * natm0_sysctl: not used, but here in case we want to add something
  465  * later...
  466  */
  467 int
  468 natm0_sysctl(SYSCTL_HANDLER_ARGS)
  469 {
  470 
  471         /* All sysctl names at this level are terminal. */
  472         return (ENOENT);
  473 }
  474 
  475 /* 
  476  * natm5_sysctl: not used, but here in case we want to add something
  477  * later...
  478  */
  479 int
  480 natm5_sysctl(SYSCTL_HANDLER_ARGS)
  481 {
  482 
  483         /* All sysctl names at this level are terminal. */
  484         return (ENOENT);
  485 }

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