bsd/net/ether_inet_pr_module.c

   1 /*
   2  * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1982, 1989, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  */
  61 /*
  62  * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
  63  * support for mandatory and extensible security protections.  This notice
  64  * is included in support of clause 2.2 (b) of the Apple Public License,
  65  * Version 2.0.
  66  */
  67
  68
  69 #include <sys/param.h>
  70 #include <sys/systm.h>
  71 #include <sys/kernel.h>
  72 #include <sys/malloc.h>
  73 #include <sys/mbuf.h>
  74 #include <sys/socket.h>
  75 #include <sys/sockio.h>
  76 #include <sys/sysctl.h>
  77 #include <kern/lock.h>
  78
  79 #include <net/if.h>
  80 #include <net/route.h>
  81 #include <net/if_llc.h>
  82 #include <net/if_dl.h>
  83 #include <net/if_types.h>
  84 #include <net/kpi_protocol.h>
  85
  86 #include <netinet/in.h>
  87 #include <netinet/in_var.h>
  88 #include <netinet/if_ether.h>
  89 #include <netinet/in_systm.h>
  90 #include <netinet/ip.h>
  91 #include <netinet/in_arp.h>
  92
  93 #include <sys/socketvar.h>
  94
  95 #include <net/dlil.h>
  96
  97 /* #include "vlan.h" */
  98 #if NVLAN > 0
  99 #include <net/if_vlan_var.h>
 100 #endif /* NVLAN > 0 */
 101 #include <net/ether_if_module.h>
 102 #if CONFIG_MACF
 103 #include <security/mac_framework.h>
 104 #endif
 105
 106 /* Local function declerations */
 107 extern void *kdp_get_interface(void);
 108 extern void kdp_set_ip_and_mac_addresses(struct in_addr *ipaddr,
 109                                                                                  struct ether_addr *macaddr);
 110
 111 static __inline__ void
 112 _ip_copy(struct in_addr * dst, const struct in_addr * src)
 113 {
 114         *dst = *src;
 115         return;
 116 }
 117
 118 static void
 119 ether_inet_arp_input(
 120         struct mbuf *m)
 121 {
 122         struct ether_arp *ea;
 123         struct sockaddr_dl      sender_hw;
 124         struct sockaddr_in      sender_ip;
 125         struct sockaddr_in      target_ip;
 126
 127         if (mbuf_len(m) < sizeof(*ea) &&
 128                 mbuf_pullup(&m, sizeof(*ea)) != 0)
 129                 return;
 130
 131         ea = mbuf_data(m);
 132
 133         /* Verify this is an ethernet/ip arp and address lengths are correct */
 134         if (ntohs(ea->arp_hrd) != ARPHRD_ETHER ||
 135                 ntohs(ea->arp_pro) != ETHERTYPE_IP ||
 136                 ea->arp_pln != sizeof(struct in_addr) ||
 137                 ea->arp_hln != ETHER_ADDR_LEN) {
 138                 mbuf_free(m);
 139                 return;
 140         }
 141
 142         /* Verify the sender is not broadcast */
 143         if (bcmp(ea->arp_sha, etherbroadcastaddr, ETHER_ADDR_LEN) == 0) {
 144                 mbuf_free(m);
 145                 return;
 146         }
 147
 148         bzero(&sender_ip, sizeof(sender_ip));
 149         sender_ip.sin_len = sizeof(sender_ip);
 150         sender_ip.sin_family = AF_INET;
 151         _ip_copy(&sender_ip.sin_addr, (const struct in_addr *)ea->arp_spa);
 152         target_ip = sender_ip;
 153         _ip_copy(&target_ip.sin_addr, (const struct in_addr *)ea->arp_tpa);
 154
 155         bzero(&sender_hw, sizeof(sender_hw));
 156         sender_hw.sdl_len = sizeof(sender_hw);
 157         sender_hw.sdl_family = AF_LINK;
 158         sender_hw.sdl_type = IFT_ETHER;
 159         sender_hw.sdl_alen = ETHER_ADDR_LEN;
 160         bcopy(ea->arp_sha, LLADDR(&sender_hw), ETHER_ADDR_LEN);
 161
 162         arp_ip_handle_input(mbuf_pkthdr_rcvif(m), ntohs(ea->arp_op), &sender_hw, &sender_ip, &target_ip);
 163         mbuf_free(m);
 164 }
 165
 166 /*
 167  * Process a received Ethernet packet;
 168  * the packet is in the mbuf chain m without
 169  * the ether header, which is provided separately.
 170  */
 171 static errno_t
 172 ether_inet_input(
 173         __unused ifnet_t                        ifp,
 174         __unused protocol_family_t      protocol_family,
 175         mbuf_t                                          m_list)
 176 {
 177         mbuf_t  m;
 178         mbuf_t  *tailptr = &m_list;
 179         mbuf_t  nextpkt;
 180
 181         /* Strip ARP and non-IP packets out of the list */
 182         for (m = m_list; m; m = nextpkt) {
 183         struct ether_header *eh = mbuf_pkthdr_header(m);
 184
 185         nextpkt = m->m_nextpkt;
 186
 187         if (eh->ether_type == htons(ETHERTYPE_IP)) {
 188                 /* put this packet in the list */
 189                 *tailptr = m;
 190                 tailptr = &m->m_nextpkt;
 191         }
 192         else {
 193                 /* Pass ARP packets to arp input */
 194                         m->m_nextpkt = NULL;
 195                 if (eh->ether_type == htons(ETHERTYPE_ARP))
 196                         ether_inet_arp_input(m);
 197                 else
 198                         mbuf_freem(m);
 199         }
 200         }
 201
 202         *tailptr = NULL;
 203
 204         /* Pass IP list to ip input */
 205         if (m_list != NULL && proto_input(PF_INET, m_list) != 0)
 206         {
 207                 mbuf_freem_list(m_list);
 208         }
 209
 210     return 0;
 211 }
 212
 213 static errno_t
 214 ether_inet_pre_output(
 215         ifnet_t                                         ifp,
 216         __unused protocol_family_t      protocol_family,
 217         mbuf_t                                          *m0,
 218         const struct sockaddr           *dst_netaddr,
 219         void*                                           route,
 220         char                                            *type,
 221         char                                            *edst)
 222 {
 223     register struct mbuf *m = *m0;
 224     const struct ether_header *eh;
 225     errno_t     result = 0;
 226
 227
 228     if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 229                 return ENETDOWN;
 230
 231     /*
 232      * Tell ether_frameout it's ok to loop packet unless negated below.
 233      */
 234     m->m_flags |= M_LOOP;
 235
 236     switch (dst_netaddr->sa_family) {
 237
 238                 case AF_INET: {
 239                                 struct sockaddr_dl      ll_dest;
 240                                 result = arp_lookup_ip(ifp, (const struct sockaddr_in*)dst_netaddr,
 241                                                                            &ll_dest, sizeof(ll_dest), (route_t)route, *m0);
 242                                 if (result == 0) {
 243                                         bcopy(LLADDR(&ll_dest), edst, ETHER_ADDR_LEN);
 244                                         *(u_int16_t*)type = htons(ETHERTYPE_IP);
 245                                 }
 246                         }
 247                         break;
 248
 249                 case pseudo_AF_HDRCMPLT:
 250                 case AF_UNSPEC:
 251                         m->m_flags &= ~M_LOOP;
 252                         eh = (const struct ether_header *)dst_netaddr->sa_data;
 253                         (void)memcpy(edst, eh->ether_dhost, 6);
 254                         *(u_short *)type = eh->ether_type;
 255                         break;
 256
 257                 default:
 258                         printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
 259                                    dst_netaddr->sa_family);
 260
 261                         result = EAFNOSUPPORT;
 262     }
 263
 264     return result;
 265 }
 266
 267 static errno_t
 268 ether_inet_resolve_multi(
 269         ifnet_t                                 ifp,
 270         const struct sockaddr   *proto_addr,
 271         struct sockaddr_dl              *out_ll,
 272         size_t                                  ll_len)
 273 {
 274         static const size_t minsize = offsetof(struct sockaddr_dl, sdl_data[0]) + ETHER_ADDR_LEN;
 275         const struct sockaddr_in        *sin = (const struct sockaddr_in*)proto_addr;
 276
 277         if (proto_addr->sa_family != AF_INET)
 278                 return EAFNOSUPPORT;
 279
 280         if (proto_addr->sa_len < sizeof(struct sockaddr_in))
 281                 return EINVAL;
 282
 283         if (ll_len < minsize)
 284                 return EMSGSIZE;
 285
 286         bzero(out_ll, minsize);
 287         out_ll->sdl_len = minsize;
 288         out_ll->sdl_family = AF_LINK;
 289         out_ll->sdl_index = ifp->if_index;
 290         out_ll->sdl_type = IFT_ETHER;
 291         out_ll->sdl_nlen = 0;
 292         out_ll->sdl_alen = ETHER_ADDR_LEN;
 293         out_ll->sdl_slen = 0;
 294         ETHER_MAP_IP_MULTICAST(&sin->sin_addr, LLADDR(out_ll));
 295
 296         return 0;
 297 }
 298
 299 static errno_t
 300 ether_inet_prmod_ioctl(
 301     ifnet_t                     ifp,
 302     __unused protocol_family_t  protocol_family,
 303     u_long                      command,
 304     void                        *data)
 305 {
 306     ifaddr_t ifa = data;
 307     struct ifreq *ifr = data;
 308     int error = 0;
 309
 310
 311     switch (command) {
 312     case SIOCSIFADDR:
 313     case SIOCAIFADDR:
 314         if ((ifnet_flags(ifp) & IFF_RUNNING) == 0) {
 315                 ifnet_set_flags(ifp, IFF_UP, IFF_UP);
 316                 ifnet_ioctl(ifp, 0, SIOCSIFFLAGS, NULL);
 317         }
 318
 319          switch (ifaddr_address_family(ifa)) {
 320
 321          case AF_INET:
 322
 323             inet_arp_init_ifaddr(ifp, ifa);
 324             /*
 325              * Register new IP and MAC addresses with the kernel
 326              * debugger if the interface is the same as was registered
 327              * by IOKernelDebugger. If no interface was registered,
 328              * fall back and just match against en0 interface.
 329              * Do this only for the first address of the interface
 330              * and not for aliases.
 331              */
 332             if (command == SIOCSIFADDR &&
 333                 ((kdp_get_interface() != 0 &&
 334                 kdp_get_interface() == ifp->if_softc) ||
 335                 (kdp_get_interface() == 0 && ifp->if_unit == 0)))
 336                         kdp_set_ip_and_mac_addresses(&(IA_SIN(ifa)->sin_addr),
 337                             ifnet_lladdr(ifp));
 338
 339             break;
 340
 341         default:
 342             break;
 343         }
 344
 345         break;
 346
 347     case SIOCGIFADDR:
 348                 ifnet_lladdr_copy_bytes(ifp, ifr->ifr_addr.sa_data, ETHER_ADDR_LEN);
 349                 break;
 350
 351     default:
 352                 error = EOPNOTSUPP;
 353                 break;
 354     }
 355
 356     return (error);
 357 }
 358
 359 static void
 360 ether_inet_event(
 361         ifnet_t                                         ifp,
 362         __unused protocol_family_t      protocol,
 363         const struct kev_msg            *event)
 364 {
 365         ifaddr_t        *addresses;
 366
 367         if (event->vendor_code !=  KEV_VENDOR_APPLE ||
 368                 event->kev_class != KEV_NETWORK_CLASS ||
 369                 event->kev_subclass != KEV_DL_SUBCLASS ||
 370                 event->event_code != KEV_DL_LINK_ADDRESS_CHANGED) {
 371                 return;
 372         }
 373
 374         if (ifnet_get_address_list_family(ifp, &addresses, AF_INET) == 0) {
 375                 int i;
 376
 377                 for (i = 0; addresses[i] != NULL; i++) {
 378                         inet_arp_init_ifaddr(ifp, addresses[i]);
 379                 }
 380
 381                 ifnet_free_address_list(addresses);
 382         }
 383 }
 384
 385 static errno_t
 386 ether_inet_arp(
 387         ifnet_t                                                         ifp,
 388         u_short                                                         arpop,
 389         const struct sockaddr_dl*                       sender_hw,
 390         const struct sockaddr*                          sender_proto,
 391         const struct sockaddr_dl*                       target_hw,
 392         const struct sockaddr*                          target_proto)
 393 {
 394         mbuf_t  m;
 395         errno_t result;
 396         struct ether_header *eh;
 397         struct ether_arp *ea;
 398         const struct sockaddr_in* sender_ip = (const struct sockaddr_in*)sender_proto;
 399         const struct sockaddr_in* target_ip = (const struct sockaddr_in*)target_proto;
 400         char *datap;
 401
 402         if (target_ip == NULL)
 403                 return EINVAL;
 404
 405         if ((sender_ip && sender_ip->sin_family != AF_INET) ||
 406             target_ip->sin_family != AF_INET)
 407                 return EAFNOSUPPORT;
 408
 409         result = mbuf_gethdr(MBUF_DONTWAIT, MBUF_TYPE_DATA, &m);
 410         if (result != 0)
 411                 return result;
 412
 413         mbuf_setlen(m, sizeof(*ea));
 414         mbuf_pkthdr_setlen(m, sizeof(*ea));
 415
 416         /* Move the data pointer in the mbuf to the end, aligned to 4 bytes */
 417         datap = mbuf_datastart(m);
 418         datap += mbuf_trailingspace(m);
 419         datap -= (((uintptr_t)datap) & 0x3);
 420         mbuf_setdata(m, datap, sizeof(*ea));
 421         ea = mbuf_data(m);
 422
 423         /*
 424          * Prepend the ethernet header, we will send the raw frame;
 425          * callee frees the original mbuf when allocation fails.
 426          */
 427         result = mbuf_prepend(&m, sizeof(*eh), MBUF_DONTWAIT);
 428         if (result != 0)
 429                 return result;
 430
 431         eh = mbuf_data(m);
 432         eh->ether_type = htons(ETHERTYPE_ARP);
 433
 434 #if CONFIG_MACF_NET
 435         mac_mbuf_label_associate_linklayer(ifp, m);
 436 #endif
 437
 438         /* Fill out the arp header */
 439         ea->arp_pro = htons(ETHERTYPE_IP);
 440         ea->arp_hln = sizeof(ea->arp_sha);
 441         ea->arp_pln = sizeof(ea->arp_spa);
 442         ea->arp_hrd = htons(ARPHRD_ETHER);
 443         ea->arp_op = htons(arpop);
 444
 445         /* Sender Hardware */
 446         if (sender_hw != NULL) {
 447                 bcopy(CONST_LLADDR(sender_hw), ea->arp_sha, sizeof(ea->arp_sha));
 448         }
 449         else {
 450                 ifnet_lladdr_copy_bytes(ifp, ea->arp_sha, ETHER_ADDR_LEN);
 451         }
 452         ifnet_lladdr_copy_bytes(ifp, eh->ether_shost, sizeof(eh->ether_shost));
 453
 454         /* Sender IP */
 455         if (sender_ip != NULL) {
 456                 bcopy(&sender_ip->sin_addr, ea->arp_spa, sizeof(ea->arp_spa));
 457         }
 458         else {
 459                 struct ifaddr *ifa;
 460
 461                 /* Look for an IP address to use as our source */
 462                 ifnet_lock_shared(ifp);
 463                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 464                         if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET)
 465                                 break;
 466                 }
 467                 if (ifa) {
 468                         bcopy(&((struct sockaddr_in*)ifa->ifa_addr)->sin_addr, ea->arp_spa,
 469                                   sizeof(ea->arp_spa));
 470                 }
 471                 ifnet_lock_done(ifp);
 472
 473                 if (ifa == NULL) {
 474                         mbuf_free(m);
 475                         return ENXIO;
 476                 }
 477         }
 478
 479         /* Target Hardware */
 480         if (target_hw == 0) {
 481                 bzero(ea->arp_tha, sizeof(ea->arp_tha));
 482                 bcopy(etherbroadcastaddr, eh->ether_dhost, sizeof(eh->ether_dhost));
 483         }
 484         else {
 485                 bcopy(CONST_LLADDR(target_hw), ea->arp_tha, sizeof(ea->arp_tha));
 486                 bcopy(CONST_LLADDR(target_hw), eh->ether_dhost, sizeof(eh->ether_dhost));
 487         }
 488
 489         /* Target IP */
 490         bcopy(&target_ip->sin_addr, ea->arp_tpa, sizeof(ea->arp_tpa));
 491
 492         ifnet_output_raw(ifp, PF_INET, m);
 493
 494         return 0;
 495 }
 496
 497 errno_t
 498 ether_attach_inet(
 499         struct ifnet    *ifp,
 500         __unused protocol_family_t proto_family)
 501 {
 502         struct ifnet_attach_proto_param_v2 proto;
 503         struct ifnet_demux_desc demux[2];
 504         u_short en_native=htons(ETHERTYPE_IP);
 505         u_short arp_native=htons(ETHERTYPE_ARP);
 506         errno_t error;
 507
 508         bzero(&demux[0], sizeof(demux));
 509         demux[0].type = DLIL_DESC_ETYPE2;
 510         demux[0].data = &en_native;
 511         demux[0].datalen = sizeof(en_native);
 512         demux[1].type = DLIL_DESC_ETYPE2;
 513         demux[1].data = &arp_native;
 514         demux[1].datalen = sizeof(arp_native);
 515
 516         bzero(&proto, sizeof(proto));
 517         proto.demux_list = demux;
 518         proto.demux_count = sizeof(demux) / sizeof(demux[0]);
 519         proto.input = ether_inet_input;
 520         proto.pre_output = ether_inet_pre_output;
 521         proto.ioctl = ether_inet_prmod_ioctl;
 522         proto.event = ether_inet_event;
 523         proto.resolve = ether_inet_resolve_multi;
 524         proto.send_arp = ether_inet_arp;
 525
 526         error = ifnet_attach_protocol_v2(ifp, proto_family, &proto);
 527         if (error && error != EEXIST) {
 528                 printf("WARNING: ether_attach_inet can't attach ip to %s%d\n",
 529                            ifp->if_name, ifp->if_unit);
 530         }
 531         return error;
 532 }
 533
 534 void
 535 ether_detach_inet(
 536         struct ifnet *ifp,
 537         protocol_family_t proto_family)
 538 {
 539         (void)ifnet_detach_protocol(ifp, proto_family);
 540 }
 541