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/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: releng/5.3/sys/netinet/if_atm.c 136588 2004-10-16 08:43:07Z cvs2svn $");
   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                 bzero(&op, sizeof(op));
  148                 addr = LLADDR(SDL(gate));
  149                 alen = SDL(gate)->sdl_alen;
  150                 if (alen < 4) {
  151                         printf("%s: bad link-level address\n", __func__);
  152                         goto failed;
  153                 }
  154 
  155                 if (alen == 4) {
  156                         /* old type address */
  157                         GET1BYTE(op.param.flags, addr, alen);
  158                         GET1BYTE(op.param.vpi, addr, alen);
  159                         GET2BYTE(op.param.vci, addr, alen);
  160                         op.param.traffic = ATMIO_TRAFFIC_UBR;
  161                         op.param.aal = (op.param.flags & ATM_PH_AAL5) ?
  162                             ATMIO_AAL_5 : ATMIO_AAL_0;
  163                 } else {
  164                         /* new address */
  165                         op.param.aal = ATMIO_AAL_5;
  166 
  167                         GET1BYTE(op.param.flags, addr, alen);
  168                         op.param.flags &= ATM_PH_LLCSNAP;
  169 
  170                         GET1BYTE(op.param.vpi, addr, alen);
  171                         GET2BYTE(op.param.vci, addr, alen);
  172 
  173                         GET1BYTE(op.param.traffic, addr, alen);
  174 
  175                         switch (op.param.traffic) {
  176 
  177                           case ATMIO_TRAFFIC_UBR:
  178                                 if (alen >= 3)
  179                                         GET3BYTE(op.param.tparam.pcr,
  180                                             addr, alen);
  181                                 break;
  182 
  183                           case ATMIO_TRAFFIC_CBR:
  184                                 if (alen < 3)
  185                                         goto bad_param;
  186                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  187                                 break;
  188 
  189                           case ATMIO_TRAFFIC_VBR:
  190                                 if (alen < 3 * 3)
  191                                         goto bad_param;
  192                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  193                                 GET3BYTE(op.param.tparam.scr, addr, alen);
  194                                 GET3BYTE(op.param.tparam.mbs, addr, alen);
  195                                 break;
  196 
  197                           case ATMIO_TRAFFIC_ABR:
  198                                 if (alen < 4 * 3 + 2 + 1 * 2 + 3)
  199                                         goto bad_param;
  200                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  201                                 GET3BYTE(op.param.tparam.mcr, addr, alen);
  202                                 GET3BYTE(op.param.tparam.icr, addr, alen);
  203                                 GET3BYTE(op.param.tparam.tbe, addr, alen);
  204                                 GET1BYTE(op.param.tparam.nrm, addr, alen);
  205                                 GET1BYTE(op.param.tparam.trm, addr, alen);
  206                                 GET2BYTE(op.param.tparam.adtf, addr, alen);
  207                                 GET1BYTE(op.param.tparam.rif, addr, alen);
  208                                 GET1BYTE(op.param.tparam.rdf, addr, alen);
  209                                 GET1BYTE(op.param.tparam.cdf, addr, alen);
  210                                 break;
  211 
  212                           default:
  213                           bad_param:
  214                                 printf("%s: bad traffic params\n", __func__);
  215                                 goto failed;
  216                         }
  217                 }
  218                 op.param.rmtu = op.param.tmtu = rt->rt_ifp->if_mtu;
  219 #ifdef NATM
  220                 /*
  221                  * let native ATM know we are using this VCI/VPI
  222                  * (i.e. reserve it)
  223                  */
  224                 sin = (struct sockaddr_in *) rt_key(rt);
  225                 if (sin->sin_family != AF_INET)
  226                         goto failed;
  227                 npcb = npcb_add(NULL, rt->rt_ifp, op.param.vci,  op.param.vpi);
  228                 if (npcb == NULL)
  229                         goto failed;
  230                 npcb->npcb_flags |= NPCB_IP;
  231                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
  232                 /* XXX: move npcb to llinfo when ATM ARP is ready */
  233                 rt->rt_llinfo = (caddr_t) npcb;
  234                 rt->rt_flags |= RTF_LLINFO;
  235 #endif
  236                 /*
  237                  * let the lower level know this circuit is active
  238                  */
  239                 op.rxhand = NULL;
  240                 op.param.flags |= ATMIO_FLAG_ASYNC;
  241                 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMOPENVCC,
  242                     (caddr_t)&op) != 0) {
  243                         printf("atm: couldn't add VC\n");
  244                         goto failed;
  245                 }
  246 
  247                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  248                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  249 
  250                 break;
  251 
  252 failed:
  253 #ifdef NATM
  254                 if (npcb) {
  255                         npcb_free(npcb, NPCB_DESTROY);
  256                         rt->rt_llinfo = NULL;
  257                         rt->rt_flags &= ~RTF_LLINFO;
  258                 }
  259 #endif
  260                 /* mark as invalid. We cannot RTM_DELETE the route from
  261                  * here, because the recursive call to rtrequest1 does
  262                  * not really work. */
  263                 rt->rt_flags |= RTF_REJECT;
  264                 break;
  265 
  266         case RTM_DELETE:
  267 #ifdef NATM
  268                 /*
  269                  * tell native ATM we are done with this VC
  270                  */
  271                 if (rt->rt_flags & RTF_LLINFO) {
  272                         npcb_free((struct natmpcb *)rt->rt_llinfo,
  273                             NPCB_DESTROY);
  274                         rt->rt_llinfo = NULL;
  275                         rt->rt_flags &= ~RTF_LLINFO;
  276                 }
  277 #endif
  278                 /*
  279                  * tell the lower layer to disable this circuit
  280                  */
  281                 bzero(&op, sizeof(op));
  282                 addr = LLADDR(SDL(gate));
  283                 addr++;
  284                 cl.vpi = *addr++;
  285                 cl.vci = *addr++ << 8;
  286                 cl.vci |= *addr++;
  287                 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMCLOSEVCC,
  288                     (caddr_t)&cl);
  289                 break;
  290         }
  291 }
  292 
  293 /*
  294  * atmresolve:
  295  *   inputs:
  296  *     [1] "rt" = the link level route to use (or null if need to look one up)
  297  *     [2] "m" = mbuf containing the data to be sent
  298  *     [3] "dst" = sockaddr_in (IP) address of dest.
  299  *   output:
  300  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
  301  *   return:
  302  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
  303  *     1 == resolve OK; desten contains result
  304  *
  305  *   XXX: will need more work if we wish to support ATMARP in the kernel,
  306  *   but this is enough for PVCs entered via the "route" command.
  307  */
  308 int
  309 atmresolve(struct rtentry *rt, struct mbuf *m, struct sockaddr *dst,
  310     struct atm_pseudohdr *desten)
  311 {
  312         struct sockaddr_dl *sdl;
  313 
  314         if (m->m_flags & (M_BCAST | M_MCAST)) {
  315                 log(LOG_INFO, "atmresolve: BCAST/MCAST packet detected/dumped");
  316                 goto bad;
  317         }
  318 
  319         if (rt == NULL) {
  320                 rt = RTALLOC1(dst, 0);
  321                 if (rt == NULL)
  322                         goto bad;       /* failed */
  323                 RT_REMREF(rt);          /* don't keep LL references */
  324                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
  325                     (rt->rt_flags & RTF_LLINFO) == 0 ||
  326                     /* XXX: are we using LLINFO? */
  327                     rt->rt_gateway->sa_family != AF_LINK) {
  328                         RT_UNLOCK(rt);
  329                         goto bad;
  330                 }
  331                 RT_UNLOCK(rt);
  332         }
  333 
  334         /*
  335          * note that rt_gateway is a sockaddr_dl which contains the
  336          * atm_pseudohdr data structure for this route.   we currently
  337          * don't need any rt_llinfo info (but will if we want to support
  338          * ATM ARP [c.f. if_ether.c]).
  339          */
  340         sdl = SDL(rt->rt_gateway);
  341 
  342         /*
  343          * Check the address family and length is valid, the address
  344          * is resolved; otherwise, try to resolve.
  345          */
  346         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen >= sizeof(*desten)) {
  347                 bcopy(LLADDR(sdl), desten, sizeof(*desten));
  348                 return (1);     /* ok, go for it! */
  349         }
  350 
  351         /*
  352          * we got an entry, but it doesn't have valid link address
  353          * info in it (it is prob. the interface route, which has
  354          * sdl_alen == 0).    dump packet.  (fall through to "bad").
  355          */
  356 bad:
  357         m_freem(m);
  358         return (0);
  359 }
  360 #endif /* INET */

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