if_iso88025subr.c

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    1 /*
    2  * Copyright (c) 1998, Larry Lile
    3  * All rights reserved.
    4  *
    5  * For latest sources and information on this driver, please
    6  * go to http://anarchy.stdio.com.
    7  *
    8  * Questions, comments or suggestions should be directed to
    9  * Larry Lile <lile@stdio.com>.
   10  * 
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice unmodified, this list of conditions, and the following
   16  *    disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  * $FreeBSD: releng/5.0/sys/net/if_iso88025subr.c 105598 2002-10-21 02:51:56Z brooks $
   34  *
   35  */
   36 
   37 /*
   38  *
   39  * General ISO 802.5 (Token Ring) support routines
   40  * 
   41  */
   42 
   43 #include "opt_inet.h"
   44 #include "opt_inet6.h"
   45 #include "opt_ipx.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/systm.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/socket.h>
   51 #include <sys/sockio.h> 
   52 #include <sys/sysctl.h>
   53 
   54 #include <net/if.h>
   55 #include <net/netisr.h>
   56 #include <net/route.h>
   57 #include <net/if_llc.h>
   58 #include <net/if_dl.h>
   59 #include <net/if_types.h>
   60 
   61 #include <net/if_arp.h>
   62 
   63 #include <net/iso88025.h>
   64 
   65 #if defined(INET) || defined(INET6)
   66 #include <netinet/in.h>
   67 #include <netinet/in_var.h>
   68 #include <netinet/if_ether.h>
   69 #endif
   70 #ifdef INET6
   71 #include <netinet6/nd6.h>
   72 #endif
   73 
   74 #ifdef IPX
   75 #include <netipx/ipx.h>
   76 #include <netipx/ipx_if.h>
   77 #endif
   78 
   79 #include <net/bpf.h>
   80 
   81 #include <machine/md_var.h>
   82 
   83 #include <vm/vm.h>
   84 #include <vm/vm_param.h>
   85 #include <vm/pmap.h>
   86 
   87 #include <net/iso88025.h>
   88 
   89 #define IFP2AC(IFP) ((struct arpcom *)IFP)
   90 
   91 void
   92 iso88025_ifattach(struct ifnet *ifp)
   93 {
   94     register struct ifaddr *ifa = NULL;
   95     register struct sockaddr_dl *sdl;
   96 
   97     ifp->if_type = IFT_ISO88025;
   98     ifp->if_addrlen = ISO88025_ADDR_LEN;
   99     ifp->if_hdrlen = ISO88025_HDR_LEN;
  100     if (ifp->if_baudrate == 0)
  101         ifp->if_baudrate = TR_16MBPS; /* 16Mbit should be a safe default */
  102     if (ifp->if_mtu == 0)
  103         ifp->if_mtu = ISO88025_DEFAULT_MTU;
  104     ifp->if_broadcastaddr = etherbroadcastaddr;
  105 
  106         ifa = ifaddr_byindex(ifp->if_index);
  107         if (ifa == 0) {
  108                 printf("iso88025_ifattach: no lladdr!\n");
  109                 return;
  110         }
  111         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
  112         sdl->sdl_type = IFT_ISO88025;
  113         sdl->sdl_alen = ifp->if_addrlen;
  114         bcopy(((struct arpcom *)ifp)->ac_enaddr, LLADDR(sdl), ifp->if_addrlen);
  115 }
  116 
  117 /*
  118  * Perform common duties while detaching a Token Ring interface
  119  */
  120 void
  121 iso88025_ifdetach(ifp, bpf)
  122         struct ifnet *ifp;
  123         int bpf;
  124 {
  125         if (bpf)
  126                 bpfdetach(ifp);
  127         if_detach(ifp);
  128 }
  129 
  130 
  131 int
  132 iso88025_ioctl(struct ifnet *ifp, int command, caddr_t data)
  133 {
  134         struct ifaddr *ifa = (struct ifaddr *) data;
  135         struct ifreq *ifr = (struct ifreq *) data;
  136         int error = 0;
  137 
  138         switch (command) {
  139         case SIOCSIFADDR:
  140                 ifp->if_flags |= IFF_UP;
  141 
  142                 switch (ifa->ifa_addr->sa_family) {
  143 #ifdef INET
  144                 case AF_INET:
  145                         ifp->if_init(ifp->if_softc);    /* before arpwhohas */
  146                         arp_ifinit(ifp, ifa);
  147                         break;
  148 #endif  /* INET */
  149 #ifdef IPX
  150                 /*
  151                  * XXX - This code is probably wrong
  152                  */
  153                 case AF_IPX:
  154                         {
  155                         register struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
  156                         struct arpcom *ac = IFP2AC(ifp);
  157 
  158                         if (ipx_nullhost(*ina))
  159                                 ina->x_host =
  160                                     *(union ipx_host *)
  161                                     ac->ac_enaddr;
  162                         else {
  163                                 bcopy((caddr_t) ina->x_host.c_host,
  164                                       (caddr_t) ac->ac_enaddr,
  165                                       sizeof(ac->ac_enaddr));
  166                         }
  167 
  168                         /*
  169                          * Set new address
  170                          */
  171                         ifp->if_init(ifp->if_softc);
  172                         break;
  173                         }
  174 #endif  /* IPX */
  175                 default:
  176                         ifp->if_init(ifp->if_softc);
  177                         break;
  178                 }
  179                 break;
  180 
  181         case SIOCGIFADDR:
  182                 {
  183                         struct sockaddr *sa;
  184 
  185                         sa = (struct sockaddr *) & ifr->ifr_data;
  186                         bcopy(((struct arpcom *)ifp->if_softc)->ac_enaddr,
  187                               (caddr_t) sa->sa_data, ISO88025_ADDR_LEN);
  188                 }
  189                 break;
  190 
  191         case SIOCSIFMTU:
  192                 /*
  193                  * Set the interface MTU.
  194                  */
  195                 if (ifr->ifr_mtu > ISO88025_MAX_MTU) {
  196                         error = EINVAL;
  197                 } else {
  198                         ifp->if_mtu = ifr->ifr_mtu;
  199                 }
  200                 break;
  201         }
  202         return (error);
  203 }
  204 
  205 /*
  206  * ISO88025 encapsulation
  207  */
  208 int
  209 iso88025_output(ifp, m, dst, rt0)
  210         struct ifnet *ifp;
  211         struct mbuf *m;
  212         struct sockaddr *dst;
  213         struct rtentry *rt0;
  214 {
  215         u_int16_t snap_type = 0;
  216         int loop_copy = 0, error = 0, rif_len = 0;
  217         u_char edst[ISO88025_ADDR_LEN];
  218         struct iso88025_header *th;
  219         struct iso88025_header gen_th;
  220         struct sockaddr_dl *sdl = NULL;
  221         struct rtentry *rt;
  222         struct arpcom *ac = (struct arpcom *)ifp;
  223 
  224         if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
  225                 senderr(ENETDOWN);
  226         getmicrotime(&ifp->if_lastchange);
  227 
  228         rt = rt0;
  229         if (rt != NULL) {
  230                 if ((rt->rt_flags & RTF_UP) == 0) {
  231                         rt0 = rt = rtalloc1(dst, 1, 0UL);
  232                         if (rt0)
  233                                 rt->rt_refcnt--;
  234                         else
  235                                 senderr(EHOSTUNREACH);
  236                 }
  237                 if (rt->rt_flags & RTF_GATEWAY) {
  238                         if (rt->rt_gwroute == 0)
  239                                 goto lookup;
  240                         if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
  241                                 rtfree(rt); rt = rt0;
  242                         lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1,
  243                                                           0UL);
  244                                 if ((rt = rt->rt_gwroute) == 0)
  245                                         senderr(EHOSTUNREACH);
  246                         }
  247                 }
  248                 if (rt->rt_flags & RTF_REJECT)
  249                         if (rt->rt_rmx.rmx_expire == 0 ||
  250                             time_second < rt->rt_rmx.rmx_expire)
  251                                 senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
  252         }
  253 
  254         /* Calculate routing info length based on arp table entry */
  255         if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway))
  256                 if (SDL_ISO88025(sdl)->trld_rcf != 0)
  257                         rif_len = TR_RCF_RIFLEN(SDL_ISO88025(sdl)->trld_rcf);
  258 
  259         /* Generate a generic 802.5 header for the packet */
  260         gen_th.ac = TR_AC;
  261         gen_th.fc = TR_LLC_FRAME;
  262         (void)memcpy((caddr_t)gen_th.iso88025_shost, (caddr_t)ac->ac_enaddr,
  263                 sizeof(ac->ac_enaddr));
  264         if (rif_len) {
  265                 gen_th.iso88025_shost[0] |= TR_RII;
  266                 if (rif_len > 2) {
  267                         gen_th.rcf = SDL_ISO88025(sdl)->trld_rcf;
  268                         (void)memcpy((caddr_t)gen_th.rd,
  269                                 (caddr_t)SDL_ISO88025(sdl)->trld_route,
  270                                 rif_len - 2);
  271                 }
  272         }
  273         
  274         switch (dst->sa_family) {
  275 #ifdef INET
  276         case AF_INET:
  277                 if (!arpresolve(ifp, rt, m, dst, edst, rt0))
  278                         return (0);     /* if not yet resolved */
  279                 snap_type = ETHERTYPE_IP;
  280                 break;
  281 #endif  /* INET */
  282 #ifdef NOT_YET
  283 #ifdef INET6
  284         case AF_INET6:
  285                 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {
  286                         /* Something bad happened */
  287                         return(0);
  288                 }
  289                 snap_type = ETHERTYPE_IPV6;
  290                 break;
  291 #endif  /* INET6 */
  292 #endif  /* NOT_YET */
  293 #ifdef IPX
  294         case AF_IPX:
  295         {
  296                 u_int8_t        *cp;
  297 
  298                 snap_type = 0;
  299                 bcopy((caddr_t)&(satoipx_addr(dst).x_host), (caddr_t)edst,
  300                         sizeof (edst));
  301 
  302                 M_PREPEND(m, 3, M_TRYWAIT);
  303                 if (m == 0)
  304                         senderr(ENOBUFS);
  305                 m = m_pullup(m, 3);
  306                 if (m == 0)
  307                         senderr(ENOBUFS);
  308                 cp = mtod(m, u_int8_t *);
  309                 *cp++ = ETHERTYPE_IPX_8022;
  310                 *cp++ = ETHERTYPE_IPX_8022;
  311                 *cp++ = LLC_UI;
  312         }
  313         break;
  314 #endif  /* IPX */
  315         case AF_UNSPEC:
  316         {
  317                 struct iso88025_sockaddr_data *sd;
  318                 /*
  319                  * For AF_UNSPEC sockaddr.sa_data must contain all of the
  320                  * mac information needed to send the packet.  This allows
  321                  * full mac, llc, and source routing function to be controlled.
  322                  * llc and source routing information must already be in the
  323                  * mbuf provided, ac/fc are set in sa_data.  sockaddr.sa_data
  324                  * should be a iso88025_sockaddr_data structure see iso88025.h
  325                  */
  326                 loop_copy = -1;
  327                 sd = (struct iso88025_sockaddr_data *)dst->sa_data;
  328                 gen_th.ac = sd->ac;
  329                 gen_th.fc = sd->fc;
  330                 (void)memcpy((caddr_t)edst, (caddr_t)sd->ether_dhost,
  331                         sizeof(sd->ether_dhost));
  332                 (void)memcpy((caddr_t)gen_th.iso88025_shost,
  333                         (caddr_t)sd->ether_shost, sizeof(sd->ether_shost));
  334                 rif_len = 0;
  335                 break;
  336         }
  337         default:
  338                 if_printf(ifp, "can't handle af%d\n", dst->sa_family);
  339                 senderr(EAFNOSUPPORT);
  340                 break;
  341         }
  342 
  343         if (snap_type != 0) {
  344                 struct llc *l;
  345                 M_PREPEND(m, sizeof (struct llc), M_DONTWAIT);
  346                 if (m == 0)
  347                         senderr(ENOBUFS);
  348                 l = mtod(m, struct llc *);
  349                 l->llc_un.type_snap.ether_type = htons(snap_type);
  350                 l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
  351                 l->llc_un.type_snap.control = LLC_UI;
  352                 l->llc_un.type_snap.org_code[0] =
  353                         l->llc_un.type_snap.org_code[1] =
  354                         l->llc_un.type_snap.org_code[2] = 0;
  355         }
  356 
  357         /*
  358          * Add local net header.  If no space in first mbuf,
  359          * allocate another.
  360          */
  361         M_PREPEND(m, ISO88025_HDR_LEN + rif_len, M_DONTWAIT);
  362         if (m == 0)
  363                 senderr(ENOBUFS);
  364 
  365         (void)memcpy((caddr_t)&gen_th.iso88025_dhost, (caddr_t)edst,
  366                      sizeof(edst));
  367 
  368         /* Copy as much of the generic header as is needed into the mbuf */
  369         th = mtod(m, struct iso88025_header *);
  370         memcpy(th, &gen_th, ISO88025_HDR_LEN + rif_len);
  371 
  372         /*
  373          * If a simplex interface, and the packet is being sent to our
  374          * Ethernet address or a broadcast address, loopback a copy.
  375          * XXX To make a simplex device behave exactly like a duplex
  376          * device, we should copy in the case of sending to our own
  377          * ethernet address (thus letting the original actually appear
  378          * on the wire). However, we don't do that here for security
  379          * reasons and compatibility with the original behavior.
  380          */     
  381         if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
  382                 if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { 
  383                         struct mbuf *n;
  384                         n = m_copy(m, 0, (int)M_COPYALL);
  385                         (void)if_simloop(ifp, n, dst->sa_family,
  386                                           ISO88025_HDR_LEN);
  387                 } else
  388                         if (bcmp(th->iso88025_dhost, th->iso88025_shost,
  389                                  ETHER_ADDR_LEN) == 0) {
  390                                 (void)if_simloop(ifp, m, dst->sa_family,
  391                                                  ISO88025_HDR_LEN);
  392                                 return(0);      /* XXX */
  393                         }       
  394         }      
  395 
  396         if (! IF_HANDOFF_ADJ(&ifp->if_snd, m, ifp, ISO88025_HDR_LEN + (sizeof(struct llc))) ) {
  397                 printf("iso88025_output: packet dropped QFULL.\n");
  398                 senderr(ENOBUFS);
  399         }
  400         return (error);
  401 
  402 bad:
  403         if (m)
  404                 m_freem(m);
  405         return (error);
  406 }
  407 
  408 /*
  409  * ISO 88025 de-encapsulation
  410  */
  411 void
  412 iso88025_input(ifp, th, m)
  413         struct ifnet *ifp;
  414         struct iso88025_header *th;
  415         struct mbuf *m;
  416 {
  417         register struct ifqueue *inq;
  418         register struct llc *l;
  419 
  420         if ((ifp->if_flags & IFF_UP) == 0) {
  421                 m_freem(m);
  422                 return;
  423         }
  424 
  425         getmicrotime(&ifp->if_lastchange);
  426         ifp->if_ibytes += m->m_pkthdr.len + sizeof(*th);
  427 
  428         if (th->iso88025_dhost[0] & 1) {
  429                 if (bcmp((caddr_t)etherbroadcastaddr,
  430                          (caddr_t)th->iso88025_dhost,
  431                          sizeof(etherbroadcastaddr)) == 0)
  432                         m->m_flags |= M_BCAST;
  433                 else
  434                         m->m_flags |= M_MCAST;
  435                 ifp->if_imcasts++;
  436         } 
  437 
  438         l = mtod(m, struct llc *);
  439 
  440         switch (l->llc_dsap) {
  441 #ifdef IPX
  442         case ETHERTYPE_IPX_8022:        /* Thanks a bunch Novell */
  443                 if ((l->llc_control != LLC_UI) ||
  444                     (l->llc_ssap != ETHERTYPE_IPX_8022))
  445                         goto dropanyway;
  446 
  447                 th->iso88025_shost[0] &= ~(TR_RII); 
  448                 m_adj(m, 3);
  449                 schednetisr(NETISR_IPX);
  450                 inq = &ipxintrq;
  451                 break;
  452 #endif  /* IPX */
  453         case LLC_SNAP_LSAP: {
  454                 u_int16_t type;
  455                 if ((l->llc_control != LLC_UI) ||
  456                     (l->llc_ssap != LLC_SNAP_LSAP))
  457                         goto dropanyway;
  458 
  459                 if (l->llc_un.type_snap.org_code[0] != 0 ||
  460                     l->llc_un.type_snap.org_code[1] != 0 ||
  461                     l->llc_un.type_snap.org_code[2] != 0)
  462                         goto dropanyway;
  463 
  464                 type = ntohs(l->llc_un.type_snap.ether_type);
  465                 m_adj(m, sizeof(struct llc));
  466                 switch (type) {
  467 #ifdef INET
  468                 case ETHERTYPE_IP:
  469                         th->iso88025_shost[0] &= ~(TR_RII); 
  470                         if (ipflow_fastforward(m))
  471                                 return;
  472                         schednetisr(NETISR_IP);
  473                         inq = &ipintrq;
  474                         break;
  475 
  476                 case ETHERTYPE_ARP:
  477                         if (ifp->if_flags & IFF_NOARP)
  478                                 goto dropanyway;
  479                         schednetisr(NETISR_ARP);
  480                         inq = &arpintrq;
  481                         break;
  482 #endif  /* INET */
  483 #ifdef IPX_SNAP /* XXX: Not supported! */
  484                 case ETHERTYPE_IPX:
  485                         th->iso88025_shost[0] &= ~(TR_RII); 
  486                         schednetisr(NETISR_IPX);
  487                         inq = &ipxintrq;
  488                         break;
  489 #endif  /* IPX_SNAP */
  490 #ifdef NOT_YET
  491 #ifdef INET6
  492                 case ETHERTYPE_IPV6:
  493                         th->iso88025_shost[0] &= ~(TR_RII); 
  494                         schednetisr(NETISR_IPV6);
  495                         inq = &ip6intrq;
  496                         break;
  497 #endif  /* INET6 */
  498 #endif  /* NOT_YET */
  499                 default:
  500                         printf("iso88025_input: unexpected llc_snap ether_type  0x%02x\n", type);
  501                         m_freem(m);
  502                         return;
  503                 }
  504                 break;
  505         }
  506         case LLC_ISO_LSAP:
  507                 switch (l->llc_control) {
  508                 case LLC_UI:
  509                         goto dropanyway;
  510                         break;
  511                 case LLC_XID:
  512                 case LLC_XID_P:
  513                         if(m->m_len < ISO88025_ADDR_LEN)
  514                                 goto dropanyway;
  515                         l->llc_window = 0;
  516                         l->llc_fid = 9;  
  517                         l->llc_class = 1;
  518                         l->llc_dsap = l->llc_ssap = 0;
  519                         /* Fall through to */  
  520                 case LLC_TEST:
  521                 case LLC_TEST_P:
  522                 {
  523                         struct sockaddr sa;
  524                         struct arpcom *ac = (struct arpcom *)ifp;
  525                         struct iso88025_sockaddr_data *th2;
  526                         int i;
  527                         u_char c = l->llc_dsap;
  528 
  529                         if (th->iso88025_shost[0] & TR_RII) { /* XXX */
  530                                 printf("iso88025_input: dropping source routed LLC_TEST\n");
  531                                 m_free(m);
  532                                 return;
  533                         }
  534                         l->llc_dsap = l->llc_ssap;
  535                         l->llc_ssap = c;
  536                         if (m->m_flags & (M_BCAST | M_MCAST))
  537                                 bcopy((caddr_t)ac->ac_enaddr, 
  538                                         (caddr_t)th->iso88025_dhost,
  539                                         ISO88025_ADDR_LEN);
  540                         sa.sa_family = AF_UNSPEC;
  541                         sa.sa_len = sizeof(sa);
  542                         th2 = (struct iso88025_sockaddr_data *)sa.sa_data;
  543                         for (i = 0; i < ISO88025_ADDR_LEN; i++) {
  544                                 th2->ether_shost[i] = c = th->iso88025_dhost[i];
  545                                 th2->ether_dhost[i] = th->iso88025_dhost[i] =
  546                                         th->iso88025_shost[i];
  547                                 th->iso88025_shost[i] = c;
  548                         }
  549                         th2->ac = TR_AC;
  550                         th2->fc = TR_LLC_FRAME;
  551                         ifp->if_output(ifp, m, &sa, NULL);
  552                         return;
  553                 }
  554                 default:
  555                         printf("iso88025_input: unexpected llc control 0x%02x\n", l->llc_control);
  556                         m_freem(m);
  557                         return;
  558                 }
  559                 break;
  560         default:
  561                 printf("iso88025_input: unknown dsap 0x%x\n", l->llc_dsap);
  562                 ifp->if_noproto++;
  563         dropanyway:
  564                 m_freem(m);
  565                 return;
  566         }
  567 
  568         if (! IF_HANDOFF(inq, m, NULL))
  569                 printf("iso88025_input: Packet dropped (Queue full).\n");
  570 }
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FreeBSD/Linux Kernel Cross Reference sys/net/if_iso88025subr.c

FreeBSD/Linux Kernel Cross Reference
sys/net/if_iso88025subr.c
