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  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1982, 1989, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  *
  57  */
  58
  59
  60
  61 #include <sys/param.h>
  62 #include <sys/systm.h>
  63 #include <sys/kernel.h>
  64 #include <sys/malloc.h>
  65 #include <sys/mbuf.h>
  66 #include <sys/socket.h>
  67 #include <sys/sockio.h>
  68 #include <sys/sysctl.h>
  69
  70 #include <net/if.h>
  71 #include <net/netisr.h>
  72 #include <net/route.h>
  73 #include <net/if_llc.h>
  74 #include <net/if_dl.h>
  75 #include <net/if_types.h>
  76 #include <netinet/if_ether.h>
  77
  78 #include <sys/socketvar.h>
  79
  80 #include <net/dlil.h>
  81 #include <netat/at_pat.h>
  82 #if NETAT
  83 extern struct ifqueue atalkintrq;
  84 #endif
  85
  86
  87 #if BRIDGE
  88 #include <net/bridge.h>
  89 #endif
  90
  91 /* #include "vlan.h" */
  92 #if NVLAN > 0
  93 #include <net/if_vlan_var.h>
  94 #endif /* NVLAN > 0 */
  95
  96 static
  97 u_char  etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
  98
  99 #define IFP2AC(IFP) ((struct arpcom *)IFP)
 100
 101
 102 struct dl_es_at_entry
 103 {
 104      struct ifnet *ifp;
 105      u_long       dl_tag;
 106      int    ref_count;
 107 };
 108
 109
 110 /*
 111  * Temp static for protocol registration XXX
 112  */
 113
 114 #define MAX_EN_COUNT 30
 115
 116 static struct dl_es_at_entry en_at_array[MAX_EN_COUNT];
 117
 118 /*
 119  * Process a received Ethernet packet;
 120  * the packet is in the mbuf chain m without
 121  * the ether header, which is provided separately.
 122  */
 123 int
 124 at_ether_input(m, frame_header, ifp, dl_tag, sync_ok)
 125     struct mbuf  *m;
 126     char         *frame_header;
 127     struct ifnet *ifp;
 128     u_long           dl_tag;
 129     int          sync_ok;
 130
 131 {
 132     register struct ether_header *eh = (struct ether_header *) frame_header;
 133     register struct ifqueue *inq=0;
 134     u_short ether_type;
 135     int s;
 136     u_int16_t ptype = -1;
 137     unsigned char buf[18];
 138
 139 #if NETAT
 140     register struct llc *l;
 141 #endif
 142
 143     if ((ifp->if_flags & IFF_UP) == 0) {
 144         m_freem(m);
 145         return EJUSTRETURN;
 146     }
 147
 148     ifp->if_lastchange = time;
 149
 150     if (eh->ether_dhost[0] & 1) {
 151         if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,
 152                  sizeof(etherbroadcastaddr)) == 0)
 153             m->m_flags |= M_BCAST;
 154         else
 155             m->m_flags |= M_MCAST;
 156     }
 157     if (m->m_flags & (M_BCAST|M_MCAST))
 158         ifp->if_imcasts++;
 159
 160     ether_type = ntohs(eh->ether_type);
 161
 162 #if NVLAN > 0
 163         if (ether_type == vlan_proto) {
 164                 if (vlan_input(eh, m) < 0)
 165                         ifp->if_data.ifi_noproto++;
 166                 return EJUSTRETURN;
 167         }
 168 #endif /* NVLAN > 0 */
 169
 170         if (ether_type > ETHERMTU)
 171              return ENOENT;
 172
 173 #if NETAT
 174         l = mtod(m, struct llc *);
 175
 176         switch (l->llc_dsap) {
 177         case LLC_SNAP_LSAP:
 178
 179              /* Temporary hack: check for AppleTalk and AARP packets */
 180              /* WARNING we're checking only on the "ether_type" (the 2 bytes
 181               * of the SNAP header. This shouldn't be a big deal,
 182               * AppleTalk pat_input is making sure we have the right packets
 183               * because it needs to discrimante AARP from EtherTalk packets.
 184               */
 185
 186              if (l->llc_ssap == LLC_SNAP_LSAP &&
 187                  l->llc_un.type_snap.control == 0x03) {
 188
 189 #ifdef APPLETALK_DEBUG
 190                   printf("new_ether_input: SNAP Cntrol type=0x%x Src=%s\n",
 191                          l->llc_un.type_snap.ether_type,
 192                          ether_sprintf(buf, &eh->ether_shost));
 193                   printf("                                     Dst=%s\n",
 194                          ether_sprintf(buf, &eh->ether_dhost));
 195 #endif /* APPLETALK_DEBUG */
 196
 197                   if ((l->llc_un.type_snap.ether_type == 0x809B) ||
 198                       (l->llc_un.type_snap.ether_type == 0x80F3)) {
 199
 200
 201                        /*
 202                         * note: for AppleTalk we need to pass the enet header of the
 203                         * packet up stack. To do so, we made sure in that the FULL packet
 204                         * is copied in the mbuf by the mace driver, and only the m_data and
 205                         * length have been shifted to make IP and the other guys happy.
 206                         */
 207
 208                        m->m_data -= sizeof(*eh);
 209                        m->m_len += sizeof(*eh);
 210                        m->m_pkthdr.len += sizeof(*eh);
 211 #ifdef APPLETALK_DEBUG
 212                        l == (struct llc *)(eh+1);
 213                        if (l->llc_un.type_snap.ether_type == 0x80F3) {
 214                             kprintf("new_ether_input: RCV AppleTalk type=0x%x Src=%s\n",
 215                                     l->llc_un.type_snap.ether_type,
 216                                     ether_sprintf(buf, &eh->ether_shost));
 217                             kprintf("                                     Dst=%s\n",
 218                                     ether_sprintf(buf, &eh->ether_dhost));
 219                        }
 220 #endif /* APPLETALK_DEBUG */
 221                        schednetisr(NETISR_APPLETALK);
 222                        inq = &atalkintrq ;
 223
 224                        break;
 225                   }
 226              }
 227
 228              break;
 229
 230
 231         default:
 232              return ENOENT;
 233         }
 234
 235
 236         if (inq == 0)
 237              return ENOENT;
 238
 239         s = splimp();
 240         if (IF_QFULL(inq)) {
 241                 IF_DROP(inq);
 242                 m_freem(m);
 243                 splx(s);
 244                 return EJUSTRETURN;
 245         } else
 246                 IF_ENQUEUE(inq, m);
 247         splx(s);
 248         return 0;
 249 #else
 250         return ENOENT;
 251 #endif  /* NETAT */
 252 }
 253
 254
 255
 256 int
 257 ether_pre_output(ifp, m0, dst_netaddr, route, type, edst, dl_tag )
 258     struct ifnet    *ifp;
 259     struct mbuf     **m0;
 260     struct sockaddr *dst_netaddr;
 261     caddr_t         route;
 262     char            *type;
 263     char            *edst;
 264     u_long          dl_tag;
 265 {
 266     int s;
 267     register struct mbuf *m = *m0;
 268     register struct rtentry *rt;
 269     register struct ether_header *eh;
 270     int off, len = m->m_pkthdr.len;
 271     int hlen;   /* link layer header lenght */
 272     struct arpcom *ac = IFP2AC(ifp);
 273
 274
 275
 276     if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 277         return ENETDOWN;
 278
 279     hlen = ETHER_HDR_LEN;
 280
 281     /*
 282      * Tell ether_frameout it's ok to loop packet unless negated below.
 283      */
 284     m->m_flags |= M_LOOP;
 285
 286     switch (dst_netaddr->sa_family) {
 287     case AF_UNSPEC:
 288         m->m_flags &= ~M_LOOP;
 289         eh = (struct ether_header *)dst_netaddr->sa_data;
 290         (void)memcpy(edst, eh->ether_dhost, 6);
 291         *(u_short *)type = eh->ether_type;
 292         break;
 293
 294
 295     case AF_APPLETALK:
 296     {
 297         eh = (struct ether_header *)dst_netaddr->sa_data;
 298         bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, 6);
 299
 300         *(u_short *)type = m->m_pkthdr.len;
 301     }
 302     break;
 303
 304
 305     default:
 306         kprintf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
 307                dst_netaddr->sa_family);
 308
 309         return EAFNOSUPPORT;
 310     }
 311
 312     return (0);
 313 }
 314
 315
 316
 317
 318
 319 int
 320 ether_prmod_ioctl(dl_tag, ifp, command, data)
 321     u_long       dl_tag;
 322     struct ifnet *ifp;
 323     int          command;
 324     caddr_t      data;
 325 {
 326     struct ifaddr *ifa = (struct ifaddr *) data;
 327     struct ifreq *ifr = (struct ifreq *) data;
 328     int error = 0;
 329     boolean_t funnel_state;
 330     struct arpcom *ac = (struct arpcom *) ifp;
 331     struct sockaddr_dl *sdl;
 332     struct sockaddr_in *sin;
 333     u_char *e_addr;
 334
 335
 336     funnel_state = thread_funnel_set(network_flock, TRUE);
 337
 338     switch (command) {
 339
 340     case SIOCSIFADDR:
 341          if ((ifp->if_flags & IFF_RUNNING) == 0) {
 342               ifp->if_flags |= IFF_UP;
 343               dlil_ioctl(0, ifp, SIOCSIFFLAGS, (caddr_t) 0);
 344          }
 345
 346         break;
 347
 348     case SIOCGIFADDR:
 349     {
 350         struct sockaddr *sa;
 351
 352         sa = (struct sockaddr *) & ifr->ifr_data;
 353         bcopy(IFP2AC(ifp)->ac_enaddr,
 354               (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
 355     }
 356     break;
 357
 358     case SIOCSIFMTU:
 359         /*
 360          * Set the interface MTU.
 361          */
 362         if (ifr->ifr_mtu > ETHERMTU) {
 363             error = EINVAL;
 364         } else {
 365             ifp->if_mtu = ifr->ifr_mtu;
 366         }
 367         break;
 368
 369     default:
 370          return EOPNOTSUPP;
 371     }
 372
 373     (void) thread_funnel_set(network_flock, funnel_state);
 374
 375     return (error);
 376 }
 377
 378
 379
 380 void
 381 ether_attach_at(struct ifnet *ifp, u_long *at_dl_tag, u_long *aarp_dl_tag)
 382 {
 383     struct dlil_proto_reg_str   reg;
 384     struct dlil_demux_desc      desc;
 385     struct dlil_demux_desc      desc2;
 386     u_short native = 0;           /* 802.2 frames use a length here */
 387     int   stat;
 388     int   first_empty;
 389     int   i;
 390
 391
 392     first_empty = MAX_EN_COUNT;
 393     for (i=0; i < MAX_EN_COUNT; i++) {
 394          if (en_at_array[i].ifp == 0)
 395               first_empty = i;
 396
 397          if (en_at_array[i].ifp == ifp) {
 398               en_at_array[i].ref_count++;
 399               *at_dl_tag = *aarp_dl_tag = en_at_array[i].dl_tag;
 400               return;
 401         }
 402     }
 403
 404     if (first_empty == MAX_EN_COUNT)
 405          return;
 406
 407     TAILQ_INIT(&reg.demux_desc_head);
 408     desc.type = DLIL_DESC_802_2_SNAP;
 409     desc.variants.desc_802_2_SNAP.dsap = LLC_SNAP_LSAP;
 410     desc.variants.desc_802_2_SNAP.ssap = LLC_SNAP_LSAP;
 411     desc.variants.desc_802_2_SNAP.control_code = 0x03;
 412     desc.variants.desc_802_2_SNAP.org[0] = 0x08;
 413     desc.variants.desc_802_2_SNAP.org[1] = 0x00;
 414     desc.variants.desc_802_2_SNAP.org[2] = 0x07;
 415     desc.variants.desc_802_2_SNAP.protocol_type = 0x809B;
 416     desc.native_type = NULL;
 417     TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
 418     reg.interface_family = ifp->if_family;
 419     reg.unit_number      = ifp->if_unit;
 420     reg.input            = at_ether_input;
 421     reg.pre_output       = ether_pre_output;
 422     reg.event            = 0;
 423     reg.offer            = 0;
 424     reg.ioctl            = ether_prmod_ioctl;
 425     reg.default_proto    = 0;
 426     reg.protocol_family  = PF_APPLETALK;
 427
 428     desc2 = desc;
 429     desc2.variants.desc_802_2_SNAP.protocol_type = 0x80F3;
 430     desc2.variants.desc_802_2_SNAP.org[0] = 0;
 431     desc2.variants.desc_802_2_SNAP.org[1] = 0;
 432     desc2.variants.desc_802_2_SNAP.org[2] = 0;
 433
 434     TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc2, next);
 435
 436     stat = dlil_attach_protocol(&reg, at_dl_tag);
 437     if (stat) {
 438         printf("WARNING: ether_attach_at can't attach at to interface\n");
 439         return;
 440     }
 441
 442     *aarp_dl_tag = *at_dl_tag;
 443
 444     en_at_array[first_empty].ifp = ifp;
 445     en_at_array[first_empty].dl_tag = *at_dl_tag;
 446     en_at_array[first_empty].ref_count = 1;
 447
 448 } /* ether_attach_at */
 449
 450
 451 void
 452 ether_detach_at(struct ifnet *ifp)
 453 {
 454      int i;
 455
 456      for (i=0; i < MAX_EN_COUNT; i++) {
 457           if (en_at_array[i].ifp == ifp)
 458                break;
 459      }
 460
 461      if (i < MAX_EN_COUNT) {
 462           if (en_at_array[i].ref_count > 1)
 463                en_at_array[i].ref_count--;
 464           else {
 465                if (en_at_array[i].ref_count == 1) {
 466                     dlil_detach_protocol(en_at_array[i].dl_tag);
 467                     en_at_array[i].ifp = 0;
 468                }
 469           }
 470      }
 471 }