The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/netinet/if_atm.c

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    1 /*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */
    2 
    3 /*-
    4  *
    5  * Copyright (c) 1996 Charles D. Cranor and Washington University.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Charles D. Cranor and
   19  *      Washington University.
   20  * 4. The name of the author may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 /*
   38  * IP <=> ATM address resolution.
   39  */
   40 #include "opt_inet.h"
   41 #include "opt_inet6.h"
   42 #include "opt_natm.h"
   43 
   44 #if defined(INET) || defined(INET6)
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/queue.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/socket.h>
   51 #include <sys/sockio.h>
   52 #include <sys/syslog.h>
   53 
   54 #include <net/if.h>
   55 #include <net/if_dl.h>
   56 #include <net/route.h>
   57 #include <net/if_atm.h>
   58 
   59 #include <netinet/in.h>
   60 #include <netinet/if_atm.h>
   61 
   62 #ifdef NATM
   63 #include <netnatm/natm.h>
   64 #endif
   65 
   66 #define SDL(s) ((struct sockaddr_dl *)s)
   67 
   68 #define GET3BYTE(V, A, L)       do {                            \
   69         (V) = ((A)[0] << 16) | ((A)[1] << 8) | (A)[2];          \
   70         (A) += 3;                                               \
   71         (L) -= 3;                                               \
   72     } while (0)
   73 
   74 #define GET2BYTE(V, A, L)       do {                            \
   75         (V) = ((A)[0] << 8) | (A)[1];                           \
   76         (A) += 2;                                               \
   77         (L) -= 2;                                               \
   78     } while (0)
   79 
   80 #define GET1BYTE(V, A, L)       do {                            \
   81         (V) = *(A)++;                                           \
   82         (L)--;                                                  \
   83     } while (0)
   84 
   85 
   86 /*
   87  * atm_rtrequest: handle ATM rt request (in support of generic code)
   88  *   inputs: "req" = request code
   89  *           "rt" = route entry
   90  *           "info" = rt_addrinfo
   91  */
   92 void
   93 atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
   94 {
   95         struct sockaddr *gate = rt->rt_gateway;
   96         struct atmio_openvcc op;
   97         struct atmio_closevcc cl;
   98         u_char *addr;
   99         u_int alen;
  100 #ifdef NATM
  101         struct sockaddr_in *sin;
  102         struct natmpcb *npcb = NULL;
  103 #endif
  104         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
  105 
  106         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
  107                 return;
  108 
  109         switch (req) {
  110 
  111         case RTM_RESOLVE: /* resolve: only happens when cloning */
  112                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
  113                 break;
  114 
  115         case RTM_ADD:
  116                 /*
  117                  * route added by a command (e.g. ifconfig, route, arp...).
  118                  *
  119                  * first check to see if this is not a host route, in which
  120                  * case we are being called via "ifconfig" to set the address.
  121                  */
  122                 if ((rt->rt_flags & RTF_HOST) == 0) {
  123                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
  124                         gate = rt->rt_gateway;
  125                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  126                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  127                         break;
  128                 }
  129 
  130                 if ((rt->rt_flags & RTF_CLONING) != 0) {
  131                         printf("atm_rtrequest: cloning route detected?\n");
  132                         break;
  133                 }
  134                 if (gate->sa_family != AF_LINK ||
  135                     gate->sa_len < sizeof(null_sdl)) {
  136                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
  137                         break;
  138                 }
  139 
  140                 KASSERT(rt->rt_ifp->if_ioctl != NULL,
  141                     ("atm_rtrequest: null ioctl"));
  142 
  143                 /*
  144                  * Parse and verify the link level address as
  145                  * an open request
  146                  */
  147 #ifdef NATM
  148                 NATM_LOCK();
  149 #endif
  150                 bzero(&op, sizeof(op));
  151                 addr = LLADDR(SDL(gate));
  152                 alen = SDL(gate)->sdl_alen;
  153                 if (alen < 4) {
  154                         printf("%s: bad link-level address\n", __func__);
  155                         goto failed;
  156                 }
  157 
  158                 if (alen == 4) {
  159                         /* old type address */
  160                         GET1BYTE(op.param.flags, addr, alen);
  161                         GET1BYTE(op.param.vpi, addr, alen);
  162                         GET2BYTE(op.param.vci, addr, alen);
  163                         op.param.traffic = ATMIO_TRAFFIC_UBR;
  164                         op.param.aal = (op.param.flags & ATM_PH_AAL5) ?
  165                             ATMIO_AAL_5 : ATMIO_AAL_0;
  166                 } else {
  167                         /* new address */
  168                         op.param.aal = ATMIO_AAL_5;
  169 
  170                         GET1BYTE(op.param.flags, addr, alen);
  171                         op.param.flags &= ATM_PH_LLCSNAP;
  172 
  173                         GET1BYTE(op.param.vpi, addr, alen);
  174                         GET2BYTE(op.param.vci, addr, alen);
  175 
  176                         GET1BYTE(op.param.traffic, addr, alen);
  177 
  178                         switch (op.param.traffic) {
  179 
  180                           case ATMIO_TRAFFIC_UBR:
  181                                 if (alen >= 3)
  182                                         GET3BYTE(op.param.tparam.pcr,
  183                                             addr, alen);
  184                                 break;
  185 
  186                           case ATMIO_TRAFFIC_CBR:
  187                                 if (alen < 3)
  188                                         goto bad_param;
  189                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  190                                 break;
  191 
  192                           case ATMIO_TRAFFIC_VBR:
  193                                 if (alen < 3 * 3)
  194                                         goto bad_param;
  195                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  196                                 GET3BYTE(op.param.tparam.scr, addr, alen);
  197                                 GET3BYTE(op.param.tparam.mbs, addr, alen);
  198                                 break;
  199 
  200                           case ATMIO_TRAFFIC_ABR:
  201                                 if (alen < 4 * 3 + 2 + 1 * 2 + 3)
  202                                         goto bad_param;
  203                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  204                                 GET3BYTE(op.param.tparam.mcr, addr, alen);
  205                                 GET3BYTE(op.param.tparam.icr, addr, alen);
  206                                 GET3BYTE(op.param.tparam.tbe, addr, alen);
  207                                 GET1BYTE(op.param.tparam.nrm, addr, alen);
  208                                 GET1BYTE(op.param.tparam.trm, addr, alen);
  209                                 GET2BYTE(op.param.tparam.adtf, addr, alen);
  210                                 GET1BYTE(op.param.tparam.rif, addr, alen);
  211                                 GET1BYTE(op.param.tparam.rdf, addr, alen);
  212                                 GET1BYTE(op.param.tparam.cdf, addr, alen);
  213                                 break;
  214 
  215                           default:
  216                           bad_param:
  217                                 printf("%s: bad traffic params\n", __func__);
  218                                 goto failed;
  219                         }
  220                 }
  221                 op.param.rmtu = op.param.tmtu = rt->rt_ifp->if_mtu;
  222 #ifdef NATM
  223                 /*
  224                  * let native ATM know we are using this VCI/VPI
  225                  * (i.e. reserve it)
  226                  */
  227                 sin = (struct sockaddr_in *) rt_key(rt);
  228                 if (sin->sin_family != AF_INET)
  229                         goto failed;
  230                 npcb = npcb_add(NULL, rt->rt_ifp, op.param.vci,  op.param.vpi);
  231                 if (npcb == NULL)
  232                         goto failed;
  233                 npcb->npcb_flags |= NPCB_IP;
  234                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
  235                 /* XXX: move npcb to llinfo when ATM ARP is ready */
  236                 rt->rt_llinfo = (caddr_t) npcb;
  237                 rt->rt_flags |= RTF_LLINFO;
  238 #endif
  239                 /*
  240                  * let the lower level know this circuit is active
  241                  */
  242                 op.rxhand = NULL;
  243                 op.param.flags |= ATMIO_FLAG_ASYNC;
  244                 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMOPENVCC,
  245                     (caddr_t)&op) != 0) {
  246                         printf("atm: couldn't add VC\n");
  247                         goto failed;
  248                 }
  249 
  250                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  251                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  252 
  253 #ifdef NATM
  254                 NATM_UNLOCK();
  255 #endif
  256                 break;
  257 
  258 failed:
  259 #ifdef NATM
  260                 if (npcb) {
  261                         npcb_free(npcb, NPCB_DESTROY);
  262                         rt->rt_llinfo = NULL;
  263                         rt->rt_flags &= ~RTF_LLINFO;
  264                 }
  265                 NATM_UNLOCK();
  266 #endif
  267                 /* mark as invalid. We cannot RTM_DELETE the route from
  268                  * here, because the recursive call to rtrequest1 does
  269                  * not really work. */
  270                 rt->rt_flags |= RTF_REJECT;
  271                 break;
  272 
  273         case RTM_DELETE:
  274 #ifdef NATM
  275                 /*
  276                  * tell native ATM we are done with this VC
  277                  */
  278                 if (rt->rt_flags & RTF_LLINFO) {
  279                         NATM_LOCK();
  280                         npcb_free((struct natmpcb *)rt->rt_llinfo,
  281                             NPCB_DESTROY);
  282                         rt->rt_llinfo = NULL;
  283                         rt->rt_flags &= ~RTF_LLINFO;
  284                         NATM_UNLOCK();
  285                 }
  286 #endif
  287                 /*
  288                  * tell the lower layer to disable this circuit
  289                  */
  290                 bzero(&op, sizeof(op));
  291                 addr = LLADDR(SDL(gate));
  292                 addr++;
  293                 cl.vpi = *addr++;
  294                 cl.vci = *addr++ << 8;
  295                 cl.vci |= *addr++;
  296                 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMCLOSEVCC,
  297                     (caddr_t)&cl);
  298                 break;
  299         }
  300 }
  301 
  302 /*
  303  * atmresolve:
  304  *   inputs:
  305  *     [1] "rt" = the link level route to use (or null if need to look one up)
  306  *     [2] "m" = mbuf containing the data to be sent
  307  *     [3] "dst" = sockaddr_in (IP) address of dest.
  308  *   output:
  309  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
  310  *   return:
  311  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
  312  *     1 == resolve OK; desten contains result
  313  *
  314  *   XXX: will need more work if we wish to support ATMARP in the kernel,
  315  *   but this is enough for PVCs entered via the "route" command.
  316  */
  317 int
  318 atmresolve(struct rtentry *rt, struct mbuf *m, struct sockaddr *dst,
  319     struct atm_pseudohdr *desten)
  320 {
  321         struct sockaddr_dl *sdl;
  322 
  323         if (m->m_flags & (M_BCAST | M_MCAST)) {
  324                 log(LOG_INFO,
  325                     "atmresolve: BCAST/MCAST packet detected/dumped\n");
  326                 goto bad;
  327         }
  328 
  329         if (rt == NULL) {
  330                 rt = RTALLOC1(dst, 0); /* link level on table 0 XXX MRT */
  331                 if (rt == NULL)
  332                         goto bad;       /* failed */
  333                 RT_REMREF(rt);          /* don't keep LL references */
  334                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
  335                     (rt->rt_flags & RTF_LLINFO) == 0 ||
  336                     /* XXX: are we using LLINFO? */
  337                     rt->rt_gateway->sa_family != AF_LINK) {
  338                         RT_UNLOCK(rt);
  339                         goto bad;
  340                 }
  341                 RT_UNLOCK(rt);
  342         }
  343 
  344         /*
  345          * note that rt_gateway is a sockaddr_dl which contains the
  346          * atm_pseudohdr data structure for this route.   we currently
  347          * don't need any rt_llinfo info (but will if we want to support
  348          * ATM ARP [c.f. if_ether.c]).
  349          */
  350         sdl = SDL(rt->rt_gateway);
  351 
  352         /*
  353          * Check the address family and length is valid, the address
  354          * is resolved; otherwise, try to resolve.
  355          */
  356         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen >= sizeof(*desten)) {
  357                 bcopy(LLADDR(sdl), desten, sizeof(*desten));
  358                 return (1);     /* ok, go for it! */
  359         }
  360 
  361         /*
  362          * we got an entry, but it doesn't have valid link address
  363          * info in it (it is prob. the interface route, which has
  364          * sdl_alen == 0).    dump packet.  (fall through to "bad").
  365          */
  366 bad:
  367         m_freem(m);
  368         return (0);
  369 }
  370 #endif /* INET */

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