bsd/net/ether_at_pr_module.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1982, 1989, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  *
  54  */
  55
  56
  57
  58 #include <sys/param.h>
  59 #include <sys/systm.h>
  60 #include <sys/kernel.h>
  61 #include <sys/malloc.h>
  62 #include <sys/mbuf.h>
  63 #include <sys/socket.h>
  64 #include <sys/sockio.h>
  65 #include <sys/sysctl.h>
  66
  67 #include <net/if.h>
  68 #include <net/netisr.h>
  69 #include <net/route.h>
  70 #include <net/if_llc.h>
  71 #include <net/if_dl.h>
  72 #include <net/if_types.h>
  73 #include <net/ndrv.h>
  74 #include <netinet/if_ether.h>
  75
  76 #include <sys/socketvar.h>
  77
  78 #include <net/dlil.h>
  79 #include <netat/at_pat.h>
  80 #if NETAT
  81 extern struct ifqueue atalkintrq;
  82 #endif
  83
  84
  85 #if BRIDGE
  86 #include <net/bridge.h>
  87 #endif
  88
  89 /* #include "vlan.h" */
  90 #if NVLAN > 0
  91 #include <net/if_vlan_var.h>
  92 #endif /* NVLAN > 0 */
  93
  94 static
  95 u_char  etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  96
  97 #define IFP2AC(IFP) ((struct arpcom *)IFP)
  98
  99
 100 struct dl_es_at_entry
 101 {
 102      struct ifnet *ifp;
 103      u_long       dl_tag;
 104      int    ref_count;
 105 };
 106
 107
 108 /*
 109  * Temp static for protocol registration XXX
 110  */
 111
 112 #define MAX_EN_COUNT 30
 113
 114 static struct dl_es_at_entry en_at_array[MAX_EN_COUNT];
 115
 116 /*
 117  * Process a received Ethernet packet;
 118  * the packet is in the mbuf chain m without
 119  * the ether header, which is provided separately.
 120  */
 121 int
 122 at_ether_input(m, frame_header, ifp, dl_tag, sync_ok)
 123     struct mbuf  *m;
 124     char         *frame_header;
 125     struct ifnet *ifp;
 126     u_long           dl_tag;
 127     int          sync_ok;
 128
 129 {
 130     register struct ether_header *eh = (struct ether_header *) frame_header;
 131     register struct ifqueue *inq=0;
 132     u_short ether_type;
 133     int s;
 134     u_int16_t ptype = -1;
 135     unsigned char buf[18];
 136
 137 #if NETAT
 138     register struct llc *l;
 139 #endif
 140
 141     if ((ifp->if_flags & IFF_UP) == 0) {
 142         m_freem(m);
 143         return EJUSTRETURN;
 144     }
 145
 146     ifp->if_lastchange = time;
 147
 148     if (eh->ether_dhost[0] & 1) {
 149         if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
 150                  sizeof(etherbroadcastaddr)) == 0)
 151             m->m_flags |= M_BCAST;
 152         else
 153             m->m_flags |= M_MCAST;
 154     }
 155     if (m->m_flags & (M_BCAST|M_MCAST))
 156         ifp->if_imcasts++;
 157
 158     ether_type = ntohs(eh->ether_type);
 159
 160 #if NVLAN > 0
 161         if (ether_type == vlan_proto) {
 162                 if (vlan_input(eh, m) < 0)
 163                         ifp->if_data.ifi_noproto++;
 164                 return EJUSTRETURN;
 165         }
 166 #endif /* NVLAN > 0 */
 167
 168         if (ether_type > ETHERMTU)
 169              return ENOENT;
 170
 171 #if NETAT
 172         l = mtod(m, struct llc *);
 173
 174         switch (l->llc_dsap) {
 175         case LLC_SNAP_LSAP:
 176
 177              /* Temporary hack: check for AppleTalk and AARP packets */
 178              /* WARNING we're checking only on the "ether_type" (the 2 bytes
 179               * of the SNAP header. This shouldn't be a big deal,
 180               * AppleTalk pat_input is making sure we have the right packets
 181               * because it needs to discrimante AARP from EtherTalk packets.
 182               */
 183
 184              if (l->llc_ssap == LLC_SNAP_LSAP &&
 185                  l->llc_un.type_snap.control == 0x03) {
 186
 187 #ifdef APPLETALK_DEBUG
 188                   printf("new_ether_input: SNAP Cntrol type=0x%x Src=%s\n",
 189                          l->llc_un.type_snap.ether_type,
 190                          ether_sprintf(buf, &eh->ether_shost));
 191                   printf("                                     Dst=%s\n",
 192                          ether_sprintf(buf, &eh->ether_dhost));
 193 #endif /* APPLETALK_DEBUG */
 194
 195                   if ((l->llc_un.type_snap.ether_type == 0x809B) ||
 196                       (l->llc_un.type_snap.ether_type == 0x80F3)) {
 197
 198
 199                        /*
 200                         * note: for AppleTalk we need to pass the enet header of the
 201                         * packet up stack. To do so, we made sure in that the FULL packet
 202                         * is copied in the mbuf by the mace driver, and only the m_data and
 203                         * length have been shifted to make IP and the other guys happy.
 204                         */
 205
 206                        m->m_data -= sizeof(*eh);
 207                        m->m_len += sizeof(*eh);
 208                        m->m_pkthdr.len += sizeof(*eh);
 209 #ifdef APPLETALK_DEBUG
 210                        l == (struct llc *)(eh+1);
 211                        if (l->llc_un.type_snap.ether_type == 0x80F3) {
 212                             kprintf("new_ether_input: RCV AppleTalk type=0x%x Src=%s\n",
 213                                     l->llc_un.type_snap.ether_type,
 214                                     ether_sprintf(buf, &eh->ether_shost));
 215                             kprintf("                                     Dst=%s\n",
 216                                     ether_sprintf(buf, &eh->ether_dhost));
 217                        }
 218 #endif /* APPLETALK_DEBUG */
 219                        schednetisr(NETISR_APPLETALK);
 220                        inq = &atalkintrq ;
 221
 222                        break;
 223                   }
 224              }
 225
 226              break;
 227
 228
 229         default:
 230              return ENOENT;
 231         }
 232
 233
 234         if (inq == 0)
 235              return ENOENT;
 236
 237         s = splimp();
 238         if (IF_QFULL(inq)) {
 239                 IF_DROP(inq);
 240                 m_freem(m);
 241                 splx(s);
 242                 return EJUSTRETURN;
 243         } else
 244                 IF_ENQUEUE(inq, m);
 245         splx(s);
 246         return 0;
 247 #else
 248         return ENOENT;
 249 #endif  /* NETAT */
 250 }
 251
 252
 253
 254 int
 255 ether_pre_output(ifp, m0, dst_netaddr, route, type, edst, dl_tag )
 256     struct ifnet    *ifp;
 257     struct mbuf     **m0;
 258     struct sockaddr *dst_netaddr;
 259     caddr_t         route;
 260     char            *type;
 261     char            *edst;
 262     u_long          dl_tag;
 263 {
 264     int s;
 265     register struct mbuf *m = *m0;
 266     register struct rtentry *rt;
 267     register struct ether_header *eh;
 268     int off, len = m->m_pkthdr.len;
 269     int hlen;   /* link layer header lenght */
 270     struct arpcom *ac = IFP2AC(ifp);
 271
 272
 273
 274     if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 275         return ENETDOWN;
 276
 277     hlen = ETHER_HDR_LEN;
 278
 279     /*
 280      * Tell ether_frameout it's ok to loop packet unless negated below.
 281      */
 282     m->m_flags |= M_LOOP;
 283
 284     switch (dst_netaddr->sa_family) {
 285     case AF_UNSPEC:
 286         m->m_flags &= ~M_LOOP;
 287         eh = (struct ether_header *)dst_netaddr->sa_data;
 288         (void)memcpy(edst, eh->ether_dhost, 6);
 289         *(u_short *)type = eh->ether_type;
 290         break;
 291
 292
 293     case AF_APPLETALK:
 294     {
 295         eh = (struct ether_header *)dst_netaddr->sa_data;
 296         bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, 6);
 297
 298         *(u_short *)type = m->m_pkthdr.len;
 299     }
 300     break;
 301
 302
 303     default:
 304         kprintf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
 305                dst_netaddr->sa_family);
 306
 307         return EAFNOSUPPORT;
 308     }
 309
 310     return (0);
 311 }
 312
 313
 314
 315
 316
 317 int
 318 ether_prmod_ioctl(dl_tag, ifp, command, data)
 319     u_long       dl_tag;
 320     struct ifnet *ifp;
 321     int          command;
 322     caddr_t      data;
 323 {
 324     struct ifaddr *ifa = (struct ifaddr *) data;
 325     struct ifreq *ifr = (struct ifreq *) data;
 326     int error = 0;
 327     boolean_t funnel_state;
 328     struct arpcom *ac = (struct arpcom *) ifp;
 329     struct sockaddr_dl *sdl;
 330     struct sockaddr_in *sin;
 331     u_char *e_addr;
 332
 333
 334     funnel_state = thread_funnel_set(network_flock, TRUE);
 335
 336     switch (command) {
 337
 338     case SIOCSIFADDR:
 339          if ((ifp->if_flags & IFF_RUNNING) == 0) {
 340               ifp->if_flags |= IFF_UP;
 341               dlil_ioctl(0, ifp, SIOCSIFFLAGS, (caddr_t) 0);
 342          }
 343
 344         break;
 345
 346     case SIOCGIFADDR:
 347     {
 348         struct sockaddr *sa;
 349
 350         sa = (struct sockaddr *) & ifr->ifr_data;
 351         bcopy(IFP2AC(ifp)->ac_enaddr,
 352               (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
 353     }
 354     break;
 355
 356     case SIOCSIFMTU:
 357         /*
 358          * Set the interface MTU.
 359          */
 360         if (ifr->ifr_mtu > ETHERMTU) {
 361             error = EINVAL;
 362         } else {
 363             ifp->if_mtu = ifr->ifr_mtu;
 364         }
 365         break;
 366
 367     default:
 368          return EOPNOTSUPP;
 369     }
 370
 371     (void) thread_funnel_set(network_flock, funnel_state);
 372
 373     return (error);
 374 }
 375
 376
 377
 378 void
 379 ether_attach_at(struct ifnet *ifp, u_long *at_dl_tag, u_long *aarp_dl_tag)
 380 {
 381     struct dlil_proto_reg_str   reg;
 382     struct dlil_demux_desc      desc;
 383     struct dlil_demux_desc      desc2;
 384     u_short native = 0;           /* 802.2 frames use a length here */
 385     int   stat;
 386     int   first_empty;
 387     int   i;
 388
 389
 390     first_empty = MAX_EN_COUNT;
 391     for (i=0; i < MAX_EN_COUNT; i++) {
 392          if (en_at_array[i].ifp == 0)
 393               first_empty = i;
 394
 395          if (en_at_array[i].ifp == ifp) {
 396               en_at_array[i].ref_count++;
 397               *at_dl_tag = *aarp_dl_tag = en_at_array[i].dl_tag;
 398               return;
 399         }
 400     }
 401
 402     if (first_empty == MAX_EN_COUNT)
 403          return;
 404
 405     TAILQ_INIT(&reg.demux_desc_head);
 406     desc.type = DLIL_DESC_802_2_SNAP;
 407     desc.variants.desc_802_2_SNAP.dsap = LLC_SNAP_LSAP;
 408     desc.variants.desc_802_2_SNAP.ssap = LLC_SNAP_LSAP;
 409     desc.variants.desc_802_2_SNAP.control_code = 0x03;
 410     desc.variants.desc_802_2_SNAP.org[0] = 0x08;
 411     desc.variants.desc_802_2_SNAP.org[1] = 0x00;
 412     desc.variants.desc_802_2_SNAP.org[2] = 0x07;
 413     desc.variants.desc_802_2_SNAP.protocol_type = 0x809B;
 414     desc.native_type = (char *) &native;
 415     TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
 416     reg.interface_family = ifp->if_family;
 417     reg.unit_number      = ifp->if_unit;
 418     reg.input            = at_ether_input;
 419     reg.pre_output       = ether_pre_output;
 420     reg.event            = 0;
 421     reg.offer            = 0;
 422     reg.ioctl            = ether_prmod_ioctl;
 423     reg.default_proto    = 0;
 424     reg.protocol_family  = PF_APPLETALK;
 425
 426     desc2 = desc;
 427     desc2.variants.desc_802_2_SNAP.protocol_type = 0x80F3;
 428     desc2.variants.desc_802_2_SNAP.org[0] = 0;
 429     desc2.variants.desc_802_2_SNAP.org[1] = 0;
 430     desc2.variants.desc_802_2_SNAP.org[2] = 0;
 431
 432     TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc2, next);
 433
 434     stat = dlil_attach_protocol(&reg, at_dl_tag);
 435     if (stat) {
 436         printf("WARNING: ether_attach_at can't attach at to interface\n");
 437         return;
 438     }
 439
 440     *aarp_dl_tag = *at_dl_tag;
 441
 442     en_at_array[first_empty].ifp = ifp;
 443     en_at_array[first_empty].dl_tag = *at_dl_tag;
 444     en_at_array[first_empty].ref_count = 1;
 445
 446 } /* ether_attach_at */
 447
 448
 449 void
 450 ether_detach_at(struct ifnet *ifp)
 451 {
 452      int i;
 453
 454      for (i=0; i < MAX_EN_COUNT; i++) {
 455           if (en_at_array[i].ifp == ifp)
 456                break;
 457      }
 458
 459      if (i < MAX_EN_COUNT) {
 460           if (en_at_array[i].ref_count > 1)
 461                en_at_array[i].ref_count--;
 462           else {
 463                if (en_at_array[i].ref_count == 1) {
 464                     dlil_detach_protocol(en_at_array[i].dl_tag);
 465                     en_at_array[i].ifp = 0;
 466                }
 467           }
 468      }
 469 }