if_atmsubr.c

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    1 /*      $NetBSD: if_atmsubr.c,v 1.10 1997/03/11 23:19:51 chuck 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  * $FreeBSD: releng/5.1/sys/net/if_atmsubr.c 114739 2003-05-05 16:35:52Z harti $
   35  */
   36 
   37 /*
   38  * if_atmsubr.c
   39  */
   40 
   41 #include "opt_inet.h"
   42 #include "opt_inet6.h"
   43 #include "opt_mac.h"
   44 #include "opt_natm.h"
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/kernel.h>
   49 #include <sys/module.h>
   50 #include <sys/mac.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/socket.h>
   53 #include <sys/sockio.h>
   54 #include <sys/errno.h>
   55 #include <sys/sysctl.h>
   56 
   57 #include <net/if.h>
   58 #include <net/netisr.h>
   59 #include <net/route.h>
   60 #include <net/if_dl.h>
   61 #include <net/if_types.h>
   62 #include <net/if_atm.h>
   63 
   64 #include <netinet/in.h>
   65 #include <netinet/if_atm.h>
   66 #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
   67 #if defined(INET) || defined(INET6)
   68 #include <netinet/in_var.h>
   69 #endif
   70 #ifdef NATM
   71 #include <netnatm/natm.h>
   72 #endif
   73 
   74 SYSCTL_NODE(_hw, OID_AUTO, atm, CTLFLAG_RW, 0, "ATM hardware");
   75 
   76 #ifndef ETHERTYPE_IPV6
   77 #define ETHERTYPE_IPV6  0x86dd
   78 #endif
   79 
   80 #define senderr(e) { error = (e); goto bad;}
   81 
   82 /*
   83  * atm_output: ATM output routine
   84  *   inputs:
   85  *     "ifp" = ATM interface to output to
   86  *     "m0" = the packet to output
   87  *     "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
   88  *     "rt0" = the route to use
   89  *   returns: error code   [0 == ok]
   90  *
   91  *   note: special semantic: if (dst == NULL) then we assume "m" already
   92  *              has an atm_pseudohdr on it and just send it directly.
   93  *              [for native mode ATM output]   if dst is null, then
   94  *              rt0 must also be NULL.
   95  */
   96 
   97 int
   98 atm_output(ifp, m0, dst, rt0)
   99         struct ifnet *ifp;
  100         struct mbuf *m0;
  101         struct sockaddr *dst;
  102         struct rtentry *rt0;
  103 {
  104         u_int16_t etype = 0;                    /* if using LLC/SNAP */
  105         int error = 0, sz;
  106         struct atm_pseudohdr atmdst, *ad;
  107         struct mbuf *m = m0;
  108         struct rtentry *rt;
  109         struct atmllc *atmllc;
  110         struct atmllc *llc_hdr = NULL;
  111         u_int32_t atm_flags;
  112 
  113 #ifdef MAC
  114         error = mac_check_ifnet_transmit(ifp, m);
  115         if (error)
  116                 senderr(error);
  117 #endif
  118 
  119         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
  120                 senderr(ENETDOWN);
  121 
  122         /*
  123          * check route
  124          */
  125         error = rt_check(&rt, &rt0, dst);
  126         if (error)
  127                 goto bad;
  128 
  129         /*
  130          * check for non-native ATM traffic   (dst != NULL)
  131          */
  132         if (dst) {
  133                 switch (dst->sa_family) {
  134 #if defined(INET) || defined(INET6)
  135                 case AF_INET:
  136                 case AF_INET6:
  137                         if (dst->sa_family == AF_INET6)
  138                                 etype = ETHERTYPE_IPV6;
  139                         else
  140                                 etype = ETHERTYPE_IP;
  141                         if (!atmresolve(rt, m, dst, &atmdst)) {
  142                                 m = NULL; 
  143                                 /* XXX: atmresolve already free'd it */
  144                                 senderr(EHOSTUNREACH);
  145                                 /* XXX: put ATMARP stuff here */
  146                                 /* XXX: watch who frees m on failure */
  147                         }
  148                         break;
  149 #endif /* INET || INET6 */
  150 
  151                 case AF_UNSPEC:
  152                         /*
  153                          * XXX: bpfwrite. assuming dst contains 12 bytes
  154                          * (atm pseudo header (4) + LLC/SNAP (8))
  155                          */
  156                         bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
  157                         llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst));
  158                         break;
  159                         
  160                 default:
  161 #if defined(__NetBSD__) || defined(__OpenBSD__)
  162                         printf("%s: can't handle af%d\n", ifp->if_xname, 
  163                             dst->sa_family);
  164 #elif defined(__FreeBSD__) || defined(__bsdi__)
  165                         printf("%s%d: can't handle af%d\n", ifp->if_name, 
  166                             ifp->if_unit, dst->sa_family);
  167 #endif
  168                         senderr(EAFNOSUPPORT);
  169                 }
  170 
  171                 /*
  172                  * must add atm_pseudohdr to data
  173                  */
  174                 sz = sizeof(atmdst);
  175                 atm_flags = ATM_PH_FLAGS(&atmdst);
  176                 if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
  177                 M_PREPEND(m, sz, M_DONTWAIT);
  178                 if (m == 0)
  179                         senderr(ENOBUFS);
  180                 ad = mtod(m, struct atm_pseudohdr *);
  181                 *ad = atmdst;
  182                 if (atm_flags & ATM_PH_LLCSNAP) {
  183                         atmllc = (struct atmllc *)(ad + 1);
  184                         if (llc_hdr == NULL) {
  185                                 bcopy(ATMLLC_HDR, atmllc->llchdr, 
  186                                       sizeof(atmllc->llchdr));
  187                                 ATM_LLC_SETTYPE(atmllc, etype); 
  188                                         /* note: in host order */
  189                         }
  190                         else
  191                                 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
  192                 }
  193         }
  194 
  195         /*
  196          * Queue message on interface, and start output if interface
  197          * not yet active.
  198          */
  199         if (! IF_HANDOFF(&ifp->if_snd, m, ifp))
  200                 return (ENOBUFS);
  201         return (error);
  202 
  203 bad:
  204         if (m)
  205                 m_freem(m);
  206         return (error);
  207 }
  208 
  209 /*
  210  * Process a received ATM packet;
  211  * the packet is in the mbuf chain m.
  212  */
  213 void
  214 atm_input(ifp, ah, m, rxhand)
  215         struct ifnet *ifp;
  216         struct atm_pseudohdr *ah;
  217         struct mbuf *m;
  218         void *rxhand;
  219 {
  220         int isr;
  221         u_int16_t etype = ETHERTYPE_IP; /* default */
  222         int s;
  223 
  224         if ((ifp->if_flags & IFF_UP) == 0) {
  225                 m_freem(m);
  226                 return;
  227         }
  228 #ifdef MAC
  229         mac_create_mbuf_from_ifnet(ifp, m);
  230 #endif
  231         ifp->if_ibytes += m->m_pkthdr.len;
  232 
  233         if (rxhand) {
  234 #ifdef NATM
  235                 struct natmpcb *npcb = rxhand;
  236                 s = splimp();           /* in case 2 atm cards @ diff lvls */
  237                 npcb->npcb_inq++;       /* count # in queue */
  238                 splx(s);
  239                 isr = NETISR_NATM;
  240                 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
  241 #else
  242                 printf("atm_input: NATM detected but not configured in kernel\n");
  243                 m_freem(m);
  244                 return;
  245 #endif
  246         } else {
  247                 /*
  248                  * handle LLC/SNAP header, if present
  249                  */
  250                 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
  251                         struct atmllc *alc;
  252                         if (m->m_len < sizeof(*alc) &&
  253                             (m = m_pullup(m, sizeof(*alc))) == 0)
  254                                 return; /* failed */
  255                         alc = mtod(m, struct atmllc *);
  256                         if (bcmp(alc, ATMLLC_HDR, 6)) {
  257 #if defined(__NetBSD__) || defined(__OpenBSD__)
  258                                 printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
  259                                        ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
  260 #elif defined(__FreeBSD__) || defined(__bsdi__)
  261                                 printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
  262                                        ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
  263 #endif
  264                                 m_freem(m);
  265                                 return;
  266                         }
  267                         etype = ATM_LLC_TYPE(alc);
  268                         m_adj(m, sizeof(*alc));
  269                 }
  270 
  271                 switch (etype) {
  272 #ifdef INET
  273                 case ETHERTYPE_IP:
  274                         isr = NETISR_IP;
  275                         break;
  276 #endif
  277 #ifdef INET6
  278                 case ETHERTYPE_IPV6:
  279                         isr = NETISR_IPV6;
  280                         break;
  281 #endif
  282                 default:
  283                         m_freem(m);
  284                         return;
  285                 }
  286         }
  287         netisr_dispatch(isr, m);
  288 }
  289 
  290 /*
  291  * Perform common duties while attaching to interface list.
  292  */
  293 void
  294 atm_ifattach(ifp)
  295         struct ifnet *ifp;
  296 {
  297         struct ifaddr *ifa;
  298         struct sockaddr_dl *sdl;
  299         struct ifatm *ifatm = ifp->if_softc;
  300 
  301         ifp->if_type = IFT_ATM;
  302         ifp->if_addrlen = 0;
  303         ifp->if_hdrlen = 0;
  304         if_attach(ifp);
  305         ifp->if_mtu = ATMMTU;
  306         ifp->if_output = atm_output;
  307 #if 0
  308         ifp->if_input = atm_input;
  309 #endif
  310         ifp->if_snd.ifq_maxlen = 50;    /* dummy */
  311 
  312 #if defined(__NetBSD__) || defined(__OpenBSD__)
  313         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
  314 #elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
  315         for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 
  316             ifa = TAILQ_NEXT(ifa, ifa_link))
  317 #elif defined(__FreeBSD__) || defined(__bsdi__)
  318         for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 
  319 #endif
  320                 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
  321                     sdl->sdl_family == AF_LINK) {
  322                         sdl->sdl_type = IFT_ATM;
  323                         sdl->sdl_alen = ifp->if_addrlen;
  324 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
  325                         bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
  326 #endif
  327                         break;
  328                 }
  329 
  330         ifp->if_linkmib = &ifatm->mib;
  331         ifp->if_linkmiblen = sizeof(ifatm->mib);
  332 }
  333 
  334 /*
  335  * Common stuff for detaching an ATM interface
  336  */
  337 void
  338 atm_ifdetach(struct ifnet *ifp)
  339 {
  340         if_detach(ifp);
  341 }
  342 
  343 static moduledata_t atm_mod = {
  344         "atm",
  345         NULL,
  346         0
  347 };
  348                 
  349 DECLARE_MODULE(atm, atm_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
  350 MODULE_VERSION(atm, 1);
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FreeBSD/Linux Kernel Cross Reference sys/net/if_atmsubr.c

FreeBSD/Linux Kernel Cross Reference
sys/net/if_atmsubr.c
