sys/net/if_iso88025subr.c

   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  * $FreeBSD$
  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->sdl_rcf != NULL)
 257                         rif_len = TR_RCF_RIFLEN(sdl->sdl_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->sdl_rcf;
 268                         (void)memcpy((caddr_t)gen_th.rd,
 269                                 (caddr_t)sdl->sdl_route, rif_len - 2);
 270                 }
 271         }
 272
 273         switch (dst->sa_family) {
 274 #ifdef INET
 275         case AF_INET:
 276                 if (!arpresolve(ifp, rt, m, dst, edst, rt0))
 277                         return (0);     /* if not yet resolved */
 278                 snap_type = ETHERTYPE_IP;
 279                 break;
 280 #endif  /* INET */
 281 #ifdef NOT_YET
 282 #ifdef INET6
 283         case AF_INET6:
 284                 if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) {
 285                         /* Something bad happened */
 286                         return(0);
 287                 }
 288                 snap_type = ETHERTYPE_IPV6;
 289                 break;
 290 #endif  /* INET6 */
 291 #endif  /* NOT_YET */
 292 #ifdef IPX
 293         case AF_IPX:
 294         {
 295                 u_int8_t        *cp;
 296
 297                 snap_type = 0;
 298                 bcopy((caddr_t)&(satoipx_addr(dst).x_host), (caddr_t)edst,
 299                         sizeof (edst));
 300
 301                 M_PREPEND(m, 3, M_TRYWAIT);
 302                 if (m == 0)
 303                         senderr(ENOBUFS);
 304                 m = m_pullup(m, 3);
 305                 if (m == 0)
 306                         senderr(ENOBUFS);
 307                 cp = mtod(m, u_int8_t *);
 308                 *cp++ = ETHERTYPE_IPX_8022;
 309                 *cp++ = ETHERTYPE_IPX_8022;
 310                 *cp++ = LLC_UI;
 311         }
 312         break;
 313 #endif  /* IPX */
 314         case AF_UNSPEC:
 315         {
 316                 struct iso88025_sockaddr_data *sd;
 317                 /*
 318                  * For AF_UNSPEC sockaddr.sa_data must contain all of the
 319                  * mac information needed to send the packet.  This allows
 320                  * full mac, llc, and source routing function to be controlled.
 321                  * llc and source routing information must already be in the
 322                  * mbuf provided, ac/fc are set in sa_data.  sockaddr.sa_data
 323                  * should be a iso88025_sockaddr_data structure see iso88025.h
 324                  */
 325                 loop_copy = -1;
 326                 sd = (struct iso88025_sockaddr_data *)dst->sa_data;
 327                 gen_th.ac = sd->ac;
 328                 gen_th.fc = sd->fc;
 329                 (void)memcpy((caddr_t)edst, (caddr_t)sd->ether_dhost,
 330                         sizeof(sd->ether_dhost));
 331                 (void)memcpy((caddr_t)gen_th.iso88025_shost,
 332                         (caddr_t)sd->ether_shost, sizeof(sd->ether_shost));
 333                 rif_len = 0;
 334                 break;
 335         }
 336         default:
 337                 printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
 338                         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 }