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/5.0/sys/net/if_atmsubr.c 106939 2002-11-15 00:00:15Z sam $
   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/mac.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/socket.h>
   51 #include <sys/sockio.h>
   52 #include <sys/errno.h>
   53 
   54 #include <net/if.h>
   55 #include <net/netisr.h>
   56 #include <net/route.h>
   57 #include <net/if_dl.h>
   58 #include <net/if_types.h>
   59 #include <net/if_atm.h>
   60 
   61 #include <netinet/in.h>
   62 #include <netinet/if_atm.h>
   63 #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
   64 #if defined(INET) || defined(INET6)
   65 #include <netinet/in_var.h>
   66 #endif
   67 #ifdef NATM
   68 #include <netnatm/natm.h>
   69 #endif
   70 
   71 #ifndef ETHERTYPE_IPV6
   72 #define ETHERTYPE_IPV6  0x86dd
   73 #endif
   74 
   75 #define senderr(e) { error = (e); goto bad;}
   76 
   77 /*
   78  * atm_output: ATM output routine
   79  *   inputs:
   80  *     "ifp" = ATM interface to output to
   81  *     "m0" = the packet to output
   82  *     "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
   83  *     "rt0" = the route to use
   84  *   returns: error code   [0 == ok]
   85  *
   86  *   note: special semantic: if (dst == NULL) then we assume "m" already
   87  *              has an atm_pseudohdr on it and just send it directly.
   88  *              [for native mode ATM output]   if dst is null, then
   89  *              rt0 must also be NULL.
   90  */
   91 
   92 int
   93 atm_output(ifp, m0, dst, rt0)
   94         register struct ifnet *ifp;
   95         struct mbuf *m0;
   96         struct sockaddr *dst;
   97         struct rtentry *rt0;
   98 {
   99         u_int16_t etype = 0;                    /* if using LLC/SNAP */
  100         int error = 0, sz;
  101         struct atm_pseudohdr atmdst, *ad;
  102         struct mbuf *m = m0;
  103         struct rtentry *rt;
  104         struct atmllc *atmllc;
  105         struct atmllc *llc_hdr = NULL;
  106         u_int32_t atm_flags;
  107 
  108 #ifdef MAC
  109         error = mac_check_ifnet_transmit(ifp, m);
  110         if (error)
  111                 senderr(error);
  112 #endif
  113 
  114         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
  115                 senderr(ENETDOWN);
  116 
  117         /*
  118          * check route
  119          */
  120         if ((rt = rt0) != NULL) {
  121 
  122                 if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
  123                         if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
  124                                 rt->rt_refcnt--;
  125                         else 
  126                                 senderr(EHOSTUNREACH);
  127                 }
  128 
  129                 if (rt->rt_flags & RTF_GATEWAY) {
  130                         if (rt->rt_gwroute == 0)
  131                                 goto lookup;
  132                         if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
  133                                 rtfree(rt); rt = rt0;
  134                         lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
  135                                 if ((rt = rt->rt_gwroute) == 0)
  136                                         senderr(EHOSTUNREACH);
  137                         }
  138                 }
  139 
  140                 /* XXX: put RTF_REJECT code here if doing ATMARP */
  141 
  142         }
  143 
  144         /*
  145          * check for non-native ATM traffic   (dst != NULL)
  146          */
  147         if (dst) {
  148                 switch (dst->sa_family) {
  149 #if defined(INET) || defined(INET6)
  150                 case AF_INET:
  151                 case AF_INET6:
  152                         if (dst->sa_family == AF_INET6)
  153                                 etype = htons(ETHERTYPE_IPV6);
  154                         else
  155                                 etype = htons(ETHERTYPE_IP);
  156                         if (!atmresolve(rt, m, dst, &atmdst)) {
  157                                 m = NULL; 
  158                                 /* XXX: atmresolve already free'd it */
  159                                 senderr(EHOSTUNREACH);
  160                                 /* XXX: put ATMARP stuff here */
  161                                 /* XXX: watch who frees m on failure */
  162                         }
  163                         break;
  164 #endif /* INET || INET6 */
  165 
  166                 case AF_UNSPEC:
  167                         /*
  168                          * XXX: bpfwrite. assuming dst contains 12 bytes
  169                          * (atm pseudo header (4) + LLC/SNAP (8))
  170                          */
  171                         bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
  172                         llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst));
  173                         break;
  174                         
  175                 default:
  176 #if defined(__NetBSD__) || defined(__OpenBSD__)
  177                         printf("%s: can't handle af%d\n", ifp->if_xname, 
  178                             dst->sa_family);
  179 #elif defined(__FreeBSD__) || defined(__bsdi__)
  180                         printf("%s%d: can't handle af%d\n", ifp->if_name, 
  181                             ifp->if_unit, dst->sa_family);
  182 #endif
  183                         senderr(EAFNOSUPPORT);
  184                 }
  185 
  186                 /*
  187                  * must add atm_pseudohdr to data
  188                  */
  189                 sz = sizeof(atmdst);
  190                 atm_flags = ATM_PH_FLAGS(&atmdst);
  191                 if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
  192                 M_PREPEND(m, sz, M_DONTWAIT);
  193                 if (m == 0)
  194                         senderr(ENOBUFS);
  195                 ad = mtod(m, struct atm_pseudohdr *);
  196                 *ad = atmdst;
  197                 if (atm_flags & ATM_PH_LLCSNAP) {
  198                         atmllc = (struct atmllc *)(ad + 1);
  199                         if (llc_hdr == NULL) {
  200                                 bcopy(ATMLLC_HDR, atmllc->llchdr, 
  201                                       sizeof(atmllc->llchdr));
  202                                 ATM_LLC_SETTYPE(atmllc, etype); 
  203                                         /* note: already in network order */
  204                         }
  205                         else
  206                                 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
  207                 }
  208         }
  209 
  210         /*
  211          * Queue message on interface, and start output if interface
  212          * not yet active.
  213          */
  214         if (! IF_HANDOFF(&ifp->if_snd, m, ifp))
  215                 return (ENOBUFS);
  216         return (error);
  217 
  218 bad:
  219         if (m)
  220                 m_freem(m);
  221         return (error);
  222 }
  223 
  224 /*
  225  * Process a received ATM packet;
  226  * the packet is in the mbuf chain m.
  227  */
  228 void
  229 atm_input(ifp, ah, m, rxhand)
  230         struct ifnet *ifp;
  231         register struct atm_pseudohdr *ah;
  232         struct mbuf *m;
  233         void *rxhand;
  234 {
  235         register struct ifqueue *inq;
  236         u_int16_t etype = ETHERTYPE_IP; /* default */
  237         int s;
  238 
  239         if ((ifp->if_flags & IFF_UP) == 0) {
  240                 m_freem(m);
  241                 return;
  242         }
  243 #ifdef MAC
  244         mac_create_mbuf_from_ifnet(ifp, m);
  245 #endif
  246         ifp->if_ibytes += m->m_pkthdr.len;
  247 
  248         if (rxhand) {
  249 #ifdef NATM
  250                 struct natmpcb *npcb = rxhand;
  251                 s = splimp();           /* in case 2 atm cards @ diff lvls */
  252                 npcb->npcb_inq++;       /* count # in queue */
  253                 splx(s);
  254                 schednetisr(NETISR_NATM);
  255                 inq = &natmintrq;
  256                 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
  257 #else
  258                 printf("atm_input: NATM detected but not configured in kernel\n");
  259                 m_freem(m);
  260                 return;
  261 #endif
  262         } else {
  263                 /*
  264                  * handle LLC/SNAP header, if present
  265                  */
  266                 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
  267                         struct atmllc *alc;
  268                         if (m->m_len < sizeof(*alc) &&
  269                             (m = m_pullup(m, sizeof(*alc))) == 0)
  270                                 return; /* failed */
  271                         alc = mtod(m, struct atmllc *);
  272                         if (bcmp(alc, ATMLLC_HDR, 6)) {
  273 #if defined(__NetBSD__) || defined(__OpenBSD__)
  274                                 printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
  275                                        ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
  276 #elif defined(__FreeBSD__) || defined(__bsdi__)
  277                                 printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
  278                                        ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
  279 #endif
  280                                 m_freem(m);
  281                                 return;
  282                         }
  283                         etype = ATM_LLC_TYPE(alc);
  284                         m_adj(m, sizeof(*alc));
  285                 }
  286 
  287                 switch (etype) {
  288 #ifdef INET
  289                 case ETHERTYPE_IP:
  290                         schednetisr(NETISR_IP);
  291                         inq = &ipintrq;
  292                         break;
  293 #endif
  294 #ifdef INET6
  295                 case ETHERTYPE_IPV6:
  296                         schednetisr(NETISR_IPV6);
  297                         inq = &ip6intrq;
  298                         break;
  299 #endif
  300                 default:
  301                         m_freem(m);
  302                         return;
  303                 }
  304         }
  305 
  306         (void) IF_HANDOFF(inq, m, NULL);
  307 }
  308 
  309 /*
  310  * Perform common duties while attaching to interface list
  311  */
  312 void
  313 atm_ifattach(ifp)
  314         register struct ifnet *ifp;
  315 {
  316         register struct ifaddr *ifa;
  317         register struct sockaddr_dl *sdl;
  318 
  319         ifp->if_type = IFT_ATM;
  320         ifp->if_addrlen = 0;
  321         ifp->if_hdrlen = 0;
  322         ifp->if_mtu = ATMMTU;
  323         ifp->if_output = atm_output;
  324 #if 0
  325         ifp->if_input = atm_input;
  326 #endif
  327         ifp->if_snd.ifq_maxlen = 50;    /* dummy */
  328 
  329 #if defined(__NetBSD__) || defined(__OpenBSD__)
  330         TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list)
  331 #elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
  332         for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 
  333             ifa = TAILQ_NEXT(ifa, ifa_link))
  334 #elif defined(__FreeBSD__) || defined(__bsdi__)
  335         for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 
  336 #endif
  337                 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
  338                     sdl->sdl_family == AF_LINK) {
  339                         sdl->sdl_type = IFT_ATM;
  340                         sdl->sdl_alen = ifp->if_addrlen;
  341 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
  342                         bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
  343 #endif
  344                         break;
  345                 }
  346 
  347 }
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FreeBSD/Linux Kernel Cross Reference sys/net/if_atmsubr.c

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