bsd/net/ether_inet_pr_module.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright (c) 1982, 1989, 1993
  25  *      The Regents of the University of California.  All rights reserved.
  26  *
  27  * Redistribution and use in source and binary forms, with or without
  28  * modification, are permitted provided that the following conditions
  29  * are met:
  30  * 1. Redistributions of source code must retain the above copyright
  31  *    notice, this list of conditions and the following disclaimer.
  32  * 2. Redistributions in binary form must reproduce the above copyright
  33  *    notice, this list of conditions and the following disclaimer in the
  34  *    documentation and/or other materials provided with the distribution.
  35  * 3. All advertising materials mentioning features or use of this software
  36  *    must display the following acknowledgement:
  37  *      This product includes software developed by the University of
  38  *      California, Berkeley and its contributors.
  39  * 4. Neither the name of the University nor the names of its contributors
  40  *    may be used to endorse or promote products derived from this software
  41  *    without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  44  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  45  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  46  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  47  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  48  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  49  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  50  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  51  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  52  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  53  * SUCH DAMAGE.
  54  *
  55  */
  56
  57
  58
  59 #include <sys/param.h>
  60 #include <sys/systm.h>
  61 #include <sys/kernel.h>
  62 #include <sys/malloc.h>
  63 #include <sys/mbuf.h>
  64 #include <sys/socket.h>
  65 #include <sys/sockio.h>
  66 #include <sys/sysctl.h>
  67 #include <kern/lock.h>
  68
  69 #include <net/if.h>
  70 #include <net/route.h>
  71 #include <net/if_llc.h>
  72 #include <net/if_dl.h>
  73 #include <net/if_types.h>
  74 #include <net/kpi_protocol.h>
  75
  76 #include <netinet/in.h>
  77 #include <netinet/in_var.h>
  78 #include <netinet/if_ether.h>
  79 #include <netinet/in_systm.h>
  80 #include <netinet/ip.h>
  81 #include <netinet/in_arp.h>
  82
  83 #include <sys/socketvar.h>
  84
  85 #include <net/dlil.h>
  86
  87 #if LLC && CCITT
  88 extern struct ifqueue pkintrq;
  89 #endif
  90
  91 #if BRIDGE
  92 #include <net/bridge.h>
  93 #endif
  94
  95 /* #include "vlan.h" */
  96 #if NVLAN > 0
  97 #include <net/if_vlan_var.h>
  98 #endif /* NVLAN > 0 */
  99
 100 /* Local function declerations */
 101 int ether_attach_inet(struct ifnet *ifp, u_long proto_family);
 102 int ether_detach_inet(struct ifnet *ifp, u_long proto_family);
 103
 104 extern void * kdp_get_interface(void);
 105 extern void ipintr(void);
 106 extern void arp_input(struct mbuf* m);
 107
 108 static void
 109 inet_ether_arp_input(
 110         struct mbuf *m)
 111 {
 112         struct ether_arp *ea;
 113         struct sockaddr_dl      sender_hw;
 114         struct sockaddr_in      sender_ip;
 115         struct sockaddr_in      target_ip;
 116
 117         if (mbuf_len(m) < sizeof(*ea) &&
 118                 mbuf_pullup(&m, sizeof(*ea)) != 0)
 119                 return;
 120
 121         ea = mbuf_data(m);
 122
 123         /* Verify this is an ethernet/ip arp and address lengths are correct */
 124         if (ntohs(ea->arp_hrd) != ARPHRD_ETHER ||
 125                 ntohs(ea->arp_pro) != ETHERTYPE_IP ||
 126                 ea->arp_pln != sizeof(struct in_addr) ||
 127                 ea->arp_hln != ETHER_ADDR_LEN) {
 128                 mbuf_free(m);
 129                 return;
 130         }
 131
 132         /* Verify the sender is not broadcast or multicast */
 133         if ((ea->arp_sha[0] & 0x01) != 0) {
 134                 mbuf_free(m);
 135                 return;
 136         }
 137
 138         bzero(&sender_ip, sizeof(sender_ip));
 139         sender_ip.sin_len = sizeof(sender_ip);
 140         sender_ip.sin_family = AF_INET;
 141         sender_ip.sin_addr = *(struct in_addr*)ea->arp_spa;
 142         target_ip = sender_ip;
 143         target_ip.sin_addr = *(struct in_addr*)ea->arp_tpa;
 144
 145         bzero(&sender_hw, sizeof(sender_hw));
 146         sender_hw.sdl_len = sizeof(sender_hw);
 147         sender_hw.sdl_family = AF_LINK;
 148         sender_hw.sdl_type = IFT_ETHER;
 149         sender_hw.sdl_alen = ETHER_ADDR_LEN;
 150         bcopy(ea->arp_sha, LLADDR(&sender_hw), ETHER_ADDR_LEN);
 151
 152         arp_ip_handle_input(mbuf_pkthdr_rcvif(m), ntohs(ea->arp_op), &sender_hw, &sender_ip, &target_ip);
 153         mbuf_free(m);
 154 }
 155
 156 /*
 157  * Process a received Ethernet packet;
 158  * the packet is in the mbuf chain m without
 159  * the ether header, which is provided separately.
 160  */
 161 static errno_t
 162 inet_ether_input(
 163         __unused ifnet_t                        ifp,
 164         __unused protocol_family_t      protocol_family,
 165         mbuf_t                                          m,
 166         char                                            *frame_header)
 167 {
 168     register struct ether_header *eh = (struct ether_header *) frame_header;
 169     u_short ether_type;
 170
 171     ether_type = ntohs(eh->ether_type);
 172
 173     switch (ether_type) {
 174
 175                 case ETHERTYPE_IP:
 176                         proto_input(PF_INET, m);
 177                         break;
 178
 179                 case ETHERTYPE_ARP: {
 180                         inet_ether_arp_input(m);
 181                 }
 182                 break;
 183
 184                 default: {
 185                         return ENOENT;
 186                 }
 187     }
 188
 189     return 0;
 190 }
 191
 192 static errno_t
 193 inet_ether_pre_output(
 194         ifnet_t                                         ifp,
 195         __unused protocol_family_t      protocol_family,
 196         mbuf_t                                          *m0,
 197         const struct sockaddr           *dst_netaddr,
 198         void*                                           route,
 199         char                                            *type,
 200         char                                            *edst)
 201 {
 202     register struct mbuf *m = *m0;
 203     register struct ether_header *eh;
 204     errno_t     result = 0;
 205
 206
 207     if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 208                 return ENETDOWN;
 209
 210     /*
 211      * Tell ether_frameout it's ok to loop packet unless negated below.
 212      */
 213     m->m_flags |= M_LOOP;
 214
 215     switch (dst_netaddr->sa_family) {
 216
 217                 case AF_INET: {
 218                                 struct sockaddr_dl      ll_dest;
 219                                 result = arp_lookup_ip(ifp, (const struct sockaddr_in*)dst_netaddr,
 220                                                                            &ll_dest, sizeof(ll_dest), (route_t)route, *m0);
 221                                 if (result == 0) {
 222                                         bcopy(LLADDR(&ll_dest), edst, ETHER_ADDR_LEN);
 223                                         *(u_int16_t*)type = htons(ETHERTYPE_IP);
 224                                 }
 225                         }
 226                         break;
 227
 228                 case pseudo_AF_HDRCMPLT:
 229                 case AF_UNSPEC:
 230                         m->m_flags &= ~M_LOOP;
 231                         eh = (struct ether_header *)dst_netaddr->sa_data;
 232                         (void)memcpy(edst, eh->ether_dhost, 6);
 233                         *(u_short *)type = eh->ether_type;
 234                         break;
 235
 236                 default:
 237                         printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
 238                                    dst_netaddr->sa_family);
 239
 240                         result = EAFNOSUPPORT;
 241     }
 242
 243     return result;
 244 }
 245
 246 static errno_t
 247 ether_inet_resolve_multi(
 248         ifnet_t                                 ifp,
 249         const struct sockaddr   *proto_addr,
 250         struct sockaddr_dl              *out_ll,
 251         size_t                                  ll_len)
 252 {
 253         static const size_t minsize = offsetof(struct sockaddr_dl, sdl_data[0]) + ETHER_ADDR_LEN;
 254         const struct sockaddr_in        *sin = (const struct sockaddr_in*)proto_addr;
 255
 256         if (proto_addr->sa_family != AF_INET)
 257                 return EAFNOSUPPORT;
 258
 259         if (proto_addr->sa_len < sizeof(struct sockaddr_in))
 260                 return EINVAL;
 261
 262         if (ll_len < minsize)
 263                 return EMSGSIZE;
 264
 265         bzero(out_ll, minsize);
 266         out_ll->sdl_len = minsize;
 267         out_ll->sdl_family = AF_LINK;
 268         out_ll->sdl_index = ifp->if_index;
 269         out_ll->sdl_type = IFT_ETHER;
 270         out_ll->sdl_nlen = 0;
 271         out_ll->sdl_alen = ETHER_ADDR_LEN;
 272         out_ll->sdl_slen = 0;
 273         ETHER_MAP_IP_MULTICAST(&sin->sin_addr, LLADDR(out_ll));
 274
 275         return 0;
 276 }
 277
 278
 279 static errno_t
 280 ether_inet_prmod_ioctl(
 281     ifnet_t                                             ifp,
 282     __unused protocol_family_t  protocol_family,
 283     u_int32_t                                   command,
 284     void*                                               data)
 285 {
 286     ifaddr_t ifa = data;
 287     struct ifreq *ifr = data;
 288     int error = 0;
 289
 290
 291     switch (command) {
 292     case SIOCSIFADDR:
 293         if ((ifnet_flags(ifp) & IFF_RUNNING) == 0) {
 294                 ifnet_set_flags(ifp, IFF_UP, IFF_UP);
 295                 ifnet_ioctl(ifp, 0, SIOCSIFFLAGS, NULL);
 296         }
 297
 298          switch (ifaddr_address_family(ifa)) {
 299
 300          case AF_INET:
 301
 302             inet_arp_init_ifaddr(ifp, ifa);
 303             /*
 304              * Register new IP and MAC addresses with the kernel debugger
 305              * if the interface is the same as was registered by IOKernelDebugger. If
 306                  * no interface was registered, fall back and just match against en0 interface.
 307              */
 308             if ((kdp_get_interface() != 0 && kdp_get_interface() == ifp->if_softc)
 309                  || (kdp_get_interface() == 0 && ifp->if_unit == 0))
 310                         kdp_set_ip_and_mac_addresses(&(IA_SIN(ifa)->sin_addr), ifnet_lladdr(ifp));
 311
 312             break;
 313
 314         default:
 315             break;
 316         }
 317
 318         break;
 319
 320     case SIOCGIFADDR:
 321         ifnet_lladdr_copy_bytes(ifp, ifr->ifr_addr.sa_data, ETHER_ADDR_LEN);
 322     break;
 323
 324     case SIOCSIFMTU:
 325         /*
 326          * IOKit IONetworkFamily will set the right MTU according to the driver
 327          */
 328
 329          return (0);
 330
 331     default:
 332          return EOPNOTSUPP;
 333     }
 334
 335     return (error);
 336 }
 337
 338 static void
 339 ether_inet_event(
 340         ifnet_t                                         ifp,
 341         __unused protocol_family_t      protocol,
 342         const struct kev_msg            *event)
 343 {
 344         ifaddr_t        *addresses;
 345
 346         if (event->vendor_code !=  KEV_VENDOR_APPLE ||
 347                 event->kev_class != KEV_NETWORK_CLASS ||
 348                 event->kev_subclass != KEV_DL_SUBCLASS ||
 349                 event->event_code != KEV_DL_LINK_ADDRESS_CHANGED) {
 350                 return;
 351         }
 352
 353         if (ifnet_get_address_list_family(ifp, &addresses, AF_INET) == 0) {
 354                 int i;
 355
 356                 for (i = 0; addresses[i] != NULL; i++) {
 357                         inet_arp_init_ifaddr(ifp, addresses[i]);
 358                 }
 359
 360                 ifnet_free_address_list(addresses);
 361         }
 362 }
 363
 364 static errno_t
 365 ether_inet_arp(
 366         ifnet_t                                                         ifp,
 367         u_short                                                         arpop,
 368         const struct sockaddr_dl*                       sender_hw,
 369         const struct sockaddr*                          sender_proto,
 370         const struct sockaddr_dl*                       target_hw,
 371         const struct sockaddr*                          target_proto)
 372 {
 373         mbuf_t  m;
 374         errno_t result;
 375         struct ether_header *eh;
 376         struct ether_arp *ea;
 377         const struct sockaddr_in* sender_ip = (const struct sockaddr_in*)sender_proto;
 378         const struct sockaddr_in* target_ip = (const struct sockaddr_in*)target_proto;
 379         char *datap;
 380
 381         if (target_ip == NULL)
 382                 return EINVAL;
 383
 384         if ((sender_ip && sender_ip->sin_family != AF_INET) ||
 385                 (target_ip && target_ip->sin_family != AF_INET))
 386                 return EAFNOSUPPORT;
 387
 388         result = mbuf_gethdr(MBUF_WAITOK, MBUF_TYPE_DATA, &m);
 389         if (result != 0)
 390                 return result;
 391
 392         mbuf_setlen(m, sizeof(*ea));
 393         mbuf_pkthdr_setlen(m, sizeof(*ea));
 394
 395         /* Move the data pointer in the mbuf to the end, aligned to 4 bytes */
 396         datap = mbuf_datastart(m);
 397         datap += mbuf_trailingspace(m);
 398         datap -= (((u_long)datap) & 0x3);
 399         mbuf_setdata(m, datap, sizeof(*ea));
 400         ea = mbuf_data(m);
 401
 402         /* Prepend the ethernet header, we will send the raw frame */
 403         mbuf_prepend(&m, sizeof(*eh), MBUF_WAITOK);
 404         eh = mbuf_data(m);
 405         eh->ether_type = htons(ETHERTYPE_ARP);
 406
 407         /* Fill out the arp header */
 408         ea->arp_pro = htons(ETHERTYPE_IP);
 409         ea->arp_hln = sizeof(ea->arp_sha);
 410         ea->arp_pln = sizeof(ea->arp_spa);
 411         ea->arp_hrd = htons(ARPHRD_ETHER);
 412         ea->arp_op = htons(arpop);
 413
 414         /* Sender Hardware */
 415         if (sender_hw != NULL) {
 416                 bcopy(CONST_LLADDR(sender_hw), ea->arp_sha, sizeof(ea->arp_sha));
 417         }
 418         else {
 419                 ifnet_lladdr_copy_bytes(ifp, ea->arp_sha, ETHER_ADDR_LEN);
 420         }
 421         ifnet_lladdr_copy_bytes(ifp, eh->ether_shost, sizeof(eh->ether_shost));
 422
 423         /* Sender IP */
 424         if (sender_ip != NULL) {
 425                 bcopy(&sender_ip->sin_addr, ea->arp_spa, sizeof(ea->arp_spa));
 426         }
 427         else {
 428                 struct ifaddr *ifa;
 429
 430                 /* Look for an IP address to use as our source */
 431                 ifnet_lock_shared(ifp);
 432                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 433                         if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET)
 434                                 break;
 435                 }
 436                 if (ifa) {
 437                         bcopy(&((struct sockaddr_in*)ifa->ifa_addr)->sin_addr, ea->arp_spa,
 438                                   sizeof(ea->arp_spa));
 439                 }
 440                 ifnet_lock_done(ifp);
 441
 442                 if (ifa == NULL) {
 443                         mbuf_free(m);
 444                         return ENXIO;
 445                 }
 446         }
 447
 448         /* Target Hardware */
 449         if (target_hw == 0) {
 450                 bzero(ea->arp_tha, sizeof(ea->arp_tha));
 451                 bcopy(etherbroadcastaddr, eh->ether_dhost, sizeof(eh->ether_dhost));
 452         }
 453         else {
 454                 bcopy(CONST_LLADDR(target_hw), ea->arp_tha, sizeof(ea->arp_tha));
 455                 bcopy(CONST_LLADDR(target_hw), eh->ether_dhost, sizeof(eh->ether_dhost));
 456         }
 457
 458         /* Target IP */
 459         bcopy(&target_ip->sin_addr, ea->arp_tpa, sizeof(ea->arp_tpa));
 460
 461         ifnet_output_raw(ifp, PF_INET, m);
 462
 463         return 0;
 464 }
 465
 466 int
 467 ether_attach_inet(
 468         struct ifnet    *ifp,
 469         __unused u_long proto_family)
 470 {
 471         struct ifnet_attach_proto_param proto;
 472         struct ifnet_demux_desc demux[2];
 473         u_short en_native=htons(ETHERTYPE_IP);
 474         u_short arp_native=htons(ETHERTYPE_ARP);
 475         errno_t error;
 476
 477         bzero(&demux[0], sizeof(demux));
 478         demux[0].type = DLIL_DESC_ETYPE2;
 479         demux[0].data = &en_native;
 480         demux[0].datalen = sizeof(en_native);
 481         demux[1].type = DLIL_DESC_ETYPE2;
 482         demux[1].data = &arp_native;
 483         demux[1].datalen = sizeof(arp_native);
 484
 485         bzero(&proto, sizeof(proto));
 486         proto.demux_list = demux;
 487         proto.demux_count = sizeof(demux) / sizeof(demux[0]);
 488         proto.input = inet_ether_input;
 489         proto.pre_output = inet_ether_pre_output;
 490         proto.ioctl = ether_inet_prmod_ioctl;
 491         proto.event = ether_inet_event;
 492         proto.resolve = ether_inet_resolve_multi;
 493         proto.send_arp = ether_inet_arp;
 494
 495         error = ifnet_attach_protocol(ifp, proto_family, &proto);
 496         if (error && error != EEXIST) {
 497                 printf("WARNING: ether_attach_inet can't attach ip to %s%d\n",
 498                            ifp->if_name, ifp->if_unit);
 499         }
 500         return error;
 501 }
 502
 503 int
 504 ether_detach_inet(
 505         struct ifnet *ifp,
 506         u_long proto_family)
 507 {
 508     int         stat;
 509
 510         stat = dlil_detach_protocol(ifp, proto_family);
 511
 512     return stat;
 513 }
 514