The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/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: src/sys/net/if_atmsubr.c,v 1.10.2.1 2001/03/06 00:29:26 obrien Exp $
   35  */
   36 
   37 /*
   38  * if_atmsubr.c
   39  */
   40 
   41 #include "opt_inet.h"
   42 #include "opt_inet6.h"
   43 #include "opt_natm.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/systm.h>
   47 #include <sys/mbuf.h>
   48 #include <sys/socket.h>
   49 #include <sys/sockio.h>
   50 #include <sys/errno.h>
   51 
   52 #include <net/if.h>
   53 #include <net/netisr.h>
   54 #include <net/route.h>
   55 #include <net/if_dl.h>
   56 #include <net/if_types.h>
   57 #include <net/if_atm.h>
   58 
   59 #include <netinet/in.h>
   60 #include <netinet/if_atm.h>
   61 #include <netinet/if_ether.h> /* XXX: for ETHERTYPE_* */
   62 #if defined(INET) || defined(INET6)
   63 #include <netinet/in_var.h>
   64 #endif
   65 #ifdef NATM
   66 #include <netnatm/natm.h>
   67 #endif
   68 
   69 #ifndef ETHERTYPE_IPV6
   70 #define ETHERTYPE_IPV6  0x86dd
   71 #endif
   72 
   73 #define senderr(e) { error = (e); goto bad;}
   74 
   75 /*
   76  * atm_output: ATM output routine
   77  *   inputs:
   78  *     "ifp" = ATM interface to output to
   79  *     "m0" = the packet to output
   80  *     "dst" = the sockaddr to send to (either IP addr, or raw VPI/VCI)
   81  *     "rt0" = the route to use
   82  *   returns: error code   [0 == ok]
   83  *
   84  *   note: special semantic: if (dst == NULL) then we assume "m" already
   85  *              has an atm_pseudohdr on it and just send it directly.
   86  *              [for native mode ATM output]   if dst is null, then
   87  *              rt0 must also be NULL.
   88  */
   89 
   90 int
   91 atm_output(ifp, m0, dst, rt0)
   92         register struct ifnet *ifp;
   93         struct mbuf *m0;
   94         struct sockaddr *dst;
   95         struct rtentry *rt0;
   96 {
   97         u_int16_t etype = 0;                    /* if using LLC/SNAP */
   98         int s, error = 0, sz;
   99         struct atm_pseudohdr atmdst, *ad;
  100         struct mbuf *m = m0;
  101         struct rtentry *rt;
  102         struct atmllc *atmllc;
  103         struct atmllc *llc_hdr = NULL;
  104         u_int32_t atm_flags;
  105 
  106         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
  107                 senderr(ENETDOWN);
  108 
  109         /*
  110          * check route
  111          */
  112         if ((rt = rt0) != NULL) {
  113 
  114                 if ((rt->rt_flags & RTF_UP) == 0) { /* route went down! */
  115                         if ((rt0 = rt = RTALLOC1(dst, 0)) != NULL)
  116                                 rt->rt_refcnt--;
  117                         else 
  118                                 senderr(EHOSTUNREACH);
  119                 }
  120 
  121                 if (rt->rt_flags & RTF_GATEWAY) {
  122                         if (rt->rt_gwroute == 0)
  123                                 goto lookup;
  124                         if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
  125                                 rtfree(rt); rt = rt0;
  126                         lookup: rt->rt_gwroute = RTALLOC1(rt->rt_gateway, 0);
  127                                 if ((rt = rt->rt_gwroute) == 0)
  128                                         senderr(EHOSTUNREACH);
  129                         }
  130                 }
  131 
  132                 /* XXX: put RTF_REJECT code here if doing ATMARP */
  133 
  134         }
  135 
  136         /*
  137          * check for non-native ATM traffic   (dst != NULL)
  138          */
  139         if (dst) {
  140                 switch (dst->sa_family) {
  141 #if defined(INET) || defined(INET6)
  142                 case AF_INET:
  143                 case AF_INET6:
  144                         if (dst->sa_family == AF_INET6)
  145                                 etype = htons(ETHERTYPE_IPV6);
  146                         else
  147                                 etype = htons(ETHERTYPE_IP);
  148                         if (!atmresolve(rt, m, dst, &atmdst)) {
  149                                 m = NULL; 
  150                                 /* XXX: atmresolve already free'd it */
  151                                 senderr(EHOSTUNREACH);
  152                                 /* XXX: put ATMARP stuff here */
  153                                 /* XXX: watch who frees m on failure */
  154                         }
  155                         break;
  156 #endif /* INET || INET6 */
  157 
  158                 case AF_UNSPEC:
  159                         /*
  160                          * XXX: bpfwrite. assuming dst contains 12 bytes
  161                          * (atm pseudo header (4) + LLC/SNAP (8))
  162                          */
  163                         bcopy(dst->sa_data, &atmdst, sizeof(atmdst));
  164                         llc_hdr = (struct atmllc *)(dst->sa_data + sizeof(atmdst));
  165                         break;
  166                         
  167                 default:
  168 #if defined(__NetBSD__) || defined(__OpenBSD__)
  169                         printf("%s: can't handle af%d\n", ifp->if_xname, 
  170                             dst->sa_family);
  171 #elif defined(__FreeBSD__) || defined(__bsdi__)
  172                         printf("%s%d: can't handle af%d\n", ifp->if_name, 
  173                             ifp->if_unit, dst->sa_family);
  174 #endif
  175                         senderr(EAFNOSUPPORT);
  176                 }
  177 
  178                 /*
  179                  * must add atm_pseudohdr to data
  180                  */
  181                 sz = sizeof(atmdst);
  182                 atm_flags = ATM_PH_FLAGS(&atmdst);
  183                 if (atm_flags & ATM_PH_LLCSNAP) sz += 8; /* sizeof snap == 8 */
  184                 M_PREPEND(m, sz, M_DONTWAIT);
  185                 if (m == 0)
  186                         senderr(ENOBUFS);
  187                 ad = mtod(m, struct atm_pseudohdr *);
  188                 *ad = atmdst;
  189                 if (atm_flags & ATM_PH_LLCSNAP) {
  190                         atmllc = (struct atmllc *)(ad + 1);
  191                         if (llc_hdr == NULL) {
  192                                 bcopy(ATMLLC_HDR, atmllc->llchdr, 
  193                                       sizeof(atmllc->llchdr));
  194                                 ATM_LLC_SETTYPE(atmllc, etype); 
  195                                         /* note: already in network order */
  196                         }
  197                         else
  198                                 bcopy(llc_hdr, atmllc, sizeof(struct atmllc));
  199                 }
  200         }
  201 
  202         /*
  203          * Queue message on interface, and start output if interface
  204          * not yet active.
  205          */
  206         s = splimp();
  207         if (IF_QFULL(&ifp->if_snd)) {
  208                 IF_DROP(&ifp->if_snd);
  209                 splx(s);
  210                 senderr(ENOBUFS);
  211         }
  212         ifp->if_obytes += m->m_pkthdr.len;
  213         IF_ENQUEUE(&ifp->if_snd, m);
  214         if ((ifp->if_flags & IFF_OACTIVE) == 0)
  215                 (*ifp->if_start)(ifp);
  216         splx(s);
  217         return (error);
  218 
  219 bad:
  220         if (m)
  221                 m_freem(m);
  222         return (error);
  223 }
  224 
  225 /*
  226  * Process a received ATM packet;
  227  * the packet is in the mbuf chain m.
  228  */
  229 void
  230 atm_input(ifp, ah, m, rxhand)
  231         struct ifnet *ifp;
  232         register struct atm_pseudohdr *ah;
  233         struct mbuf *m;
  234         void *rxhand;
  235 {
  236         register struct ifqueue *inq;
  237         u_int16_t etype = ETHERTYPE_IP; /* default */
  238         int s;
  239 
  240         if ((ifp->if_flags & IFF_UP) == 0) {
  241                 m_freem(m);
  242                 return;
  243         }
  244         ifp->if_ibytes += m->m_pkthdr.len;
  245 
  246         if (rxhand) {
  247 #ifdef NATM
  248                 struct natmpcb *npcb = rxhand;
  249                 s = splimp();           /* in case 2 atm cards @ diff lvls */
  250                 npcb->npcb_inq++;       /* count # in queue */
  251                 splx(s);
  252                 schednetisr(NETISR_NATM);
  253                 inq = &natmintrq;
  254                 m->m_pkthdr.rcvif = rxhand; /* XXX: overload */
  255 #else
  256                 printf("atm_input: NATM detected but not configured in kernel\n");
  257                 m_freem(m);
  258                 return;
  259 #endif
  260         } else {
  261                 /*
  262                  * handle LLC/SNAP header, if present
  263                  */
  264                 if (ATM_PH_FLAGS(ah) & ATM_PH_LLCSNAP) {
  265                         struct atmllc *alc;
  266                         if (m->m_len < sizeof(*alc) &&
  267                             (m = m_pullup(m, sizeof(*alc))) == 0)
  268                                 return; /* failed */
  269                         alc = mtod(m, struct atmllc *);
  270                         if (bcmp(alc, ATMLLC_HDR, 6)) {
  271 #if defined(__NetBSD__) || defined(__OpenBSD__)
  272                                 printf("%s: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
  273                                        ifp->if_xname, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
  274 #elif defined(__FreeBSD__) || defined(__bsdi__)
  275                                 printf("%s%d: recv'd invalid LLC/SNAP frame [vp=%d,vc=%d]\n",
  276                                        ifp->if_name, ifp->if_unit, ATM_PH_VPI(ah), ATM_PH_VCI(ah));
  277 #endif
  278                                 m_freem(m);
  279                                 return;
  280                         }
  281                         etype = ATM_LLC_TYPE(alc);
  282                         m_adj(m, sizeof(*alc));
  283                 }
  284 
  285                 switch (etype) {
  286 #ifdef INET
  287                 case ETHERTYPE_IP:
  288                         schednetisr(NETISR_IP);
  289                         inq = &ipintrq;
  290                         break;
  291 #endif
  292 #ifdef INET6
  293                 case ETHERTYPE_IPV6:
  294                         schednetisr(NETISR_IPV6);
  295                         inq = &ip6intrq;
  296                         break;
  297 #endif
  298                 default:
  299                         m_freem(m);
  300                         return;
  301                 }
  302         }
  303 
  304         s = splimp();
  305         if (IF_QFULL(inq)) {
  306                 IF_DROP(inq);
  307                 m_freem(m);
  308         } else
  309                 IF_ENQUEUE(inq, m);
  310         splx(s);
  311 }
  312 
  313 /*
  314  * Perform common duties while attaching to interface list
  315  */
  316 void
  317 atm_ifattach(ifp)
  318         register struct ifnet *ifp;
  319 {
  320         register struct ifaddr *ifa;
  321         register struct sockaddr_dl *sdl;
  322 
  323         ifp->if_type = IFT_ATM;
  324         ifp->if_addrlen = 0;
  325         ifp->if_hdrlen = 0;
  326         ifp->if_mtu = ATMMTU;
  327         ifp->if_output = atm_output;
  328         ifp->if_snd.ifq_maxlen = 50;    /* dummy */
  329 
  330 #if defined(__NetBSD__) || defined(__OpenBSD__)
  331         for (ifa = TAILQ_FIRST(&ifp->if_addrlist); ifa != 0;
  332             ifa = TAILQ_NEXT(ifa, ifa_list))
  333 #elif defined(__FreeBSD__) && (__FreeBSD__ > 2)
  334         for (ifa = TAILQ_FIRST(&ifp->if_addrhead); ifa; 
  335             ifa = TAILQ_NEXT(ifa, ifa_link))
  336 #elif defined(__FreeBSD__) || defined(__bsdi__)
  337         for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) 
  338 #endif
  339                 if ((sdl = (struct sockaddr_dl *)ifa->ifa_addr) &&
  340                     sdl->sdl_family == AF_LINK) {
  341                         sdl->sdl_type = IFT_ATM;
  342                         sdl->sdl_alen = ifp->if_addrlen;
  343 #ifdef notyet /* if using ATMARP, store hardware address using the next line */
  344                         bcopy(ifp->hw_addr, LLADDR(sdl), ifp->if_addrlen);
  345 #endif
  346                         break;
  347                 }
  348 
  349 }

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