bsd/net/ether_inet_pr_module.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, 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
  63
  64 #include <sys/param.h>
  65 #include <sys/systm.h>
  66 #include <sys/kernel.h>
  67 #include <sys/malloc.h>
  68 #include <sys/mbuf.h>
  69 #include <sys/socket.h>
  70 #include <sys/sockio.h>
  71 #include <sys/sysctl.h>
  72 #include <kern/lock.h>
  73
  74 #include <net/if.h>
  75 #include <net/route.h>
  76 #include <net/if_llc.h>
  77 #include <net/if_dl.h>
  78 #include <net/if_types.h>
  79 #include <net/kpi_protocol.h>
  80
  81 #include <netinet/in.h>
  82 #include <netinet/in_var.h>
  83 #include <netinet/if_ether.h>
  84 #include <netinet/in_systm.h>
  85 #include <netinet/ip.h>
  86 #include <netinet/in_arp.h>
  87
  88 #include <sys/socketvar.h>
  89
  90 #include <net/dlil.h>
  91
  92 #if LLC && CCITT
  93 extern struct ifqueue pkintrq;
  94 #endif
  95
  96 #if BRIDGE
  97 #include <net/bridge.h>
  98 #endif
  99
 100 /* #include "vlan.h" */
 101 #if NVLAN > 0
 102 #include <net/if_vlan_var.h>
 103 #endif /* NVLAN > 0 */
 104
 105 /* Local function declerations */
 106 int ether_attach_inet(struct ifnet *ifp, u_long proto_family);
 107 int ether_detach_inet(struct ifnet *ifp, u_long proto_family);
 108
 109 extern void * kdp_get_interface(void);
 110 extern void ipintr(void);
 111 extern void arp_input(struct mbuf* m);
 112
 113 static void
 114 inet_ether_arp_input(
 115         struct mbuf *m)
 116 {
 117         struct ether_arp *ea;
 118         struct sockaddr_dl      sender_hw;
 119         struct sockaddr_in      sender_ip;
 120         struct sockaddr_in      target_ip;
 121
 122         if (mbuf_len(m) < sizeof(*ea) &&
 123                 mbuf_pullup(&m, sizeof(*ea)) != 0)
 124                 return;
 125
 126         ea = mbuf_data(m);
 127
 128         /* Verify this is an ethernet/ip arp and address lengths are correct */
 129         if (ntohs(ea->arp_hrd) != ARPHRD_ETHER ||
 130                 ntohs(ea->arp_pro) != ETHERTYPE_IP ||
 131                 ea->arp_pln != sizeof(struct in_addr) ||
 132                 ea->arp_hln != ETHER_ADDR_LEN) {
 133                 mbuf_free(m);
 134                 return;
 135         }
 136
 137         /* Verify the sender is not broadcast */
 138         if (bcmp(ea->arp_sha, etherbroadcastaddr, ETHER_ADDR_LEN) == 0) {
 139                 mbuf_free(m);
 140                 return;
 141         }
 142
 143         bzero(&sender_ip, sizeof(sender_ip));
 144         sender_ip.sin_len = sizeof(sender_ip);
 145         sender_ip.sin_family = AF_INET;
 146         sender_ip.sin_addr = *(struct in_addr*)ea->arp_spa;
 147         target_ip = sender_ip;
 148         target_ip.sin_addr = *(struct in_addr*)ea->arp_tpa;
 149
 150         bzero(&sender_hw, sizeof(sender_hw));
 151         sender_hw.sdl_len = sizeof(sender_hw);
 152         sender_hw.sdl_family = AF_LINK;
 153         sender_hw.sdl_type = IFT_ETHER;
 154         sender_hw.sdl_alen = ETHER_ADDR_LEN;
 155         bcopy(ea->arp_sha, LLADDR(&sender_hw), ETHER_ADDR_LEN);
 156
 157         arp_ip_handle_input(mbuf_pkthdr_rcvif(m), ntohs(ea->arp_op), &sender_hw, &sender_ip, &target_ip);
 158         mbuf_free(m);
 159 }
 160
 161 /*
 162  * Process a received Ethernet packet;
 163  * the packet is in the mbuf chain m without
 164  * the ether header, which is provided separately.
 165  */
 166 static errno_t
 167 inet_ether_input(
 168         __unused ifnet_t                        ifp,
 169         __unused protocol_family_t      protocol_family,
 170         mbuf_t                                          m,
 171         char                                            *frame_header)
 172 {
 173     register struct ether_header *eh = (struct ether_header *) frame_header;
 174     u_short ether_type;
 175
 176     ether_type = ntohs(eh->ether_type);
 177
 178     switch (ether_type) {
 179
 180                 case ETHERTYPE_IP:
 181                         proto_input(PF_INET, m);
 182                         break;
 183
 184                 case ETHERTYPE_ARP: {
 185                         inet_ether_arp_input(m);
 186                 }
 187                 break;
 188
 189                 default: {
 190                         return ENOENT;
 191                 }
 192     }
 193
 194     return 0;
 195 }
 196
 197 static errno_t
 198 inet_ether_pre_output(
 199         ifnet_t                                         ifp,
 200         __unused protocol_family_t      protocol_family,
 201         mbuf_t                                          *m0,
 202         const struct sockaddr           *dst_netaddr,
 203         void*                                           route,
 204         char                                            *type,
 205         char                                            *edst)
 206 {
 207     register struct mbuf *m = *m0;
 208     register struct ether_header *eh;
 209     errno_t     result = 0;
 210
 211
 212     if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
 213                 return ENETDOWN;
 214
 215     /*
 216      * Tell ether_frameout it's ok to loop packet unless negated below.
 217      */
 218     m->m_flags |= M_LOOP;
 219
 220     switch (dst_netaddr->sa_family) {
 221
 222                 case AF_INET: {
 223                                 struct sockaddr_dl      ll_dest;
 224                                 result = arp_lookup_ip(ifp, (const struct sockaddr_in*)dst_netaddr,
 225                                                                            &ll_dest, sizeof(ll_dest), (route_t)route, *m0);
 226                                 if (result == 0) {
 227                                         bcopy(LLADDR(&ll_dest), edst, ETHER_ADDR_LEN);
 228                                         *(u_int16_t*)type = htons(ETHERTYPE_IP);
 229                                 }
 230                         }
 231                         break;
 232
 233                 case pseudo_AF_HDRCMPLT:
 234                 case AF_UNSPEC:
 235                         m->m_flags &= ~M_LOOP;
 236                         eh = (struct ether_header *)dst_netaddr->sa_data;
 237                         (void)memcpy(edst, eh->ether_dhost, 6);
 238                         *(u_short *)type = eh->ether_type;
 239                         break;
 240
 241                 default:
 242                         printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
 243                                    dst_netaddr->sa_family);
 244
 245                         result = EAFNOSUPPORT;
 246     }
 247
 248     return result;
 249 }
 250
 251 static errno_t
 252 ether_inet_resolve_multi(
 253         ifnet_t                                 ifp,
 254         const struct sockaddr   *proto_addr,
 255         struct sockaddr_dl              *out_ll,
 256         size_t                                  ll_len)
 257 {
 258         static const size_t minsize = offsetof(struct sockaddr_dl, sdl_data[0]) + ETHER_ADDR_LEN;
 259         const struct sockaddr_in        *sin = (const struct sockaddr_in*)proto_addr;
 260
 261         if (proto_addr->sa_family != AF_INET)
 262                 return EAFNOSUPPORT;
 263
 264         if (proto_addr->sa_len < sizeof(struct sockaddr_in))
 265                 return EINVAL;
 266
 267         if (ll_len < minsize)
 268                 return EMSGSIZE;
 269
 270         bzero(out_ll, minsize);
 271         out_ll->sdl_len = minsize;
 272         out_ll->sdl_family = AF_LINK;
 273         out_ll->sdl_index = ifp->if_index;
 274         out_ll->sdl_type = IFT_ETHER;
 275         out_ll->sdl_nlen = 0;
 276         out_ll->sdl_alen = ETHER_ADDR_LEN;
 277         out_ll->sdl_slen = 0;
 278         ETHER_MAP_IP_MULTICAST(&sin->sin_addr, LLADDR(out_ll));
 279
 280         return 0;
 281 }
 282
 283
 284 static errno_t
 285 ether_inet_prmod_ioctl(
 286     ifnet_t                                             ifp,
 287     __unused protocol_family_t  protocol_family,
 288     u_int32_t                                   command,
 289     void*                                               data)
 290 {
 291     ifaddr_t ifa = data;
 292     struct ifreq *ifr = data;
 293     int error = 0;
 294
 295
 296     switch (command) {
 297     case SIOCSIFADDR:
 298         if ((ifnet_flags(ifp) & IFF_RUNNING) == 0) {
 299                 ifnet_set_flags(ifp, IFF_UP, IFF_UP);
 300                 ifnet_ioctl(ifp, 0, SIOCSIFFLAGS, NULL);
 301         }
 302
 303          switch (ifaddr_address_family(ifa)) {
 304
 305          case AF_INET:
 306
 307             inet_arp_init_ifaddr(ifp, ifa);
 308             /*
 309              * Register new IP and MAC addresses with the kernel debugger
 310              * if the interface is the same as was registered by IOKernelDebugger. If
 311                  * no interface was registered, fall back and just match against en0 interface.
 312              */
 313             if ((kdp_get_interface() != 0 && kdp_get_interface() == ifp->if_softc)
 314                  || (kdp_get_interface() == 0 && ifp->if_unit == 0))
 315                         kdp_set_ip_and_mac_addresses(&(IA_SIN(ifa)->sin_addr), ifnet_lladdr(ifp));
 316
 317             break;
 318
 319         default:
 320             break;
 321         }
 322
 323         break;
 324
 325     case SIOCGIFADDR:
 326         ifnet_lladdr_copy_bytes(ifp, ifr->ifr_addr.sa_data, ETHER_ADDR_LEN);
 327     break;
 328
 329     case SIOCSIFMTU:
 330         /*
 331          * IOKit IONetworkFamily will set the right MTU according to the driver
 332          */
 333
 334          return (0);
 335
 336     default:
 337          return EOPNOTSUPP;
 338     }
 339
 340     return (error);
 341 }
 342
 343 static void
 344 ether_inet_event(
 345         ifnet_t                                         ifp,
 346         __unused protocol_family_t      protocol,
 347         const struct kev_msg            *event)
 348 {
 349         ifaddr_t        *addresses;
 350
 351         if (event->vendor_code !=  KEV_VENDOR_APPLE ||
 352                 event->kev_class != KEV_NETWORK_CLASS ||
 353                 event->kev_subclass != KEV_DL_SUBCLASS ||
 354                 event->event_code != KEV_DL_LINK_ADDRESS_CHANGED) {
 355                 return;
 356         }
 357
 358         if (ifnet_get_address_list_family(ifp, &addresses, AF_INET) == 0) {
 359                 int i;
 360
 361                 for (i = 0; addresses[i] != NULL; i++) {
 362                         inet_arp_init_ifaddr(ifp, addresses[i]);
 363                 }
 364
 365                 ifnet_free_address_list(addresses);
 366         }
 367 }
 368
 369 static errno_t
 370 ether_inet_arp(
 371         ifnet_t                                                         ifp,
 372         u_short                                                         arpop,
 373         const struct sockaddr_dl*                       sender_hw,
 374         const struct sockaddr*                          sender_proto,
 375         const struct sockaddr_dl*                       target_hw,
 376         const struct sockaddr*                          target_proto)
 377 {
 378         mbuf_t  m;
 379         errno_t result;
 380         struct ether_header *eh;
 381         struct ether_arp *ea;
 382         const struct sockaddr_in* sender_ip = (const struct sockaddr_in*)sender_proto;
 383         const struct sockaddr_in* target_ip = (const struct sockaddr_in*)target_proto;
 384         char *datap;
 385
 386         if (target_ip == NULL)
 387                 return EINVAL;
 388
 389         if ((sender_ip && sender_ip->sin_family != AF_INET) ||
 390                 (target_ip && target_ip->sin_family != AF_INET))
 391                 return EAFNOSUPPORT;
 392
 393         result = mbuf_gethdr(MBUF_WAITOK, MBUF_TYPE_DATA, &m);
 394         if (result != 0)
 395                 return result;
 396
 397         mbuf_setlen(m, sizeof(*ea));
 398         mbuf_pkthdr_setlen(m, sizeof(*ea));
 399
 400         /* Move the data pointer in the mbuf to the end, aligned to 4 bytes */
 401         datap = mbuf_datastart(m);
 402         datap += mbuf_trailingspace(m);
 403         datap -= (((u_long)datap) & 0x3);
 404         mbuf_setdata(m, datap, sizeof(*ea));
 405         ea = mbuf_data(m);
 406
 407         /* Prepend the ethernet header, we will send the raw frame */
 408         mbuf_prepend(&m, sizeof(*eh), MBUF_WAITOK);
 409         eh = mbuf_data(m);
 410         eh->ether_type = htons(ETHERTYPE_ARP);
 411
 412         /* Fill out the arp header */
 413         ea->arp_pro = htons(ETHERTYPE_IP);
 414         ea->arp_hln = sizeof(ea->arp_sha);
 415         ea->arp_pln = sizeof(ea->arp_spa);
 416         ea->arp_hrd = htons(ARPHRD_ETHER);
 417         ea->arp_op = htons(arpop);
 418
 419         /* Sender Hardware */
 420         if (sender_hw != NULL) {
 421                 bcopy(CONST_LLADDR(sender_hw), ea->arp_sha, sizeof(ea->arp_sha));
 422         }
 423         else {
 424                 ifnet_lladdr_copy_bytes(ifp, ea->arp_sha, ETHER_ADDR_LEN);
 425         }
 426         ifnet_lladdr_copy_bytes(ifp, eh->ether_shost, sizeof(eh->ether_shost));
 427
 428         /* Sender IP */
 429         if (sender_ip != NULL) {
 430                 bcopy(&sender_ip->sin_addr, ea->arp_spa, sizeof(ea->arp_spa));
 431         }
 432         else {
 433                 struct ifaddr *ifa;
 434
 435                 /* Look for an IP address to use as our source */
 436                 ifnet_lock_shared(ifp);
 437                 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
 438                         if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET)
 439                                 break;
 440                 }
 441                 if (ifa) {
 442                         bcopy(&((struct sockaddr_in*)ifa->ifa_addr)->sin_addr, ea->arp_spa,
 443                                   sizeof(ea->arp_spa));
 444                 }
 445                 ifnet_lock_done(ifp);
 446
 447                 if (ifa == NULL) {
 448                         mbuf_free(m);
 449                         return ENXIO;
 450                 }
 451         }
 452
 453         /* Target Hardware */
 454         if (target_hw == 0) {
 455                 bzero(ea->arp_tha, sizeof(ea->arp_tha));
 456                 bcopy(etherbroadcastaddr, eh->ether_dhost, sizeof(eh->ether_dhost));
 457         }
 458         else {
 459                 bcopy(CONST_LLADDR(target_hw), ea->arp_tha, sizeof(ea->arp_tha));
 460                 bcopy(CONST_LLADDR(target_hw), eh->ether_dhost, sizeof(eh->ether_dhost));
 461         }
 462
 463         /* Target IP */
 464         bcopy(&target_ip->sin_addr, ea->arp_tpa, sizeof(ea->arp_tpa));
 465
 466         ifnet_output_raw(ifp, PF_INET, m);
 467
 468         return 0;
 469 }
 470
 471 int
 472 ether_attach_inet(
 473         struct ifnet    *ifp,
 474         __unused u_long proto_family)
 475 {
 476         struct ifnet_attach_proto_param proto;
 477         struct ifnet_demux_desc demux[2];
 478         u_short en_native=htons(ETHERTYPE_IP);
 479         u_short arp_native=htons(ETHERTYPE_ARP);
 480         errno_t error;
 481
 482         bzero(&demux[0], sizeof(demux));
 483         demux[0].type = DLIL_DESC_ETYPE2;
 484         demux[0].data = &en_native;
 485         demux[0].datalen = sizeof(en_native);
 486         demux[1].type = DLIL_DESC_ETYPE2;
 487         demux[1].data = &arp_native;
 488         demux[1].datalen = sizeof(arp_native);
 489
 490         bzero(&proto, sizeof(proto));
 491         proto.demux_list = demux;
 492         proto.demux_count = sizeof(demux) / sizeof(demux[0]);
 493         proto.input = inet_ether_input;
 494         proto.pre_output = inet_ether_pre_output;
 495         proto.ioctl = ether_inet_prmod_ioctl;
 496         proto.event = ether_inet_event;
 497         proto.resolve = ether_inet_resolve_multi;
 498         proto.send_arp = ether_inet_arp;
 499
 500         error = ifnet_attach_protocol(ifp, proto_family, &proto);
 501         if (error && error != EEXIST) {
 502                 printf("WARNING: ether_attach_inet can't attach ip to %s%d\n",
 503                            ifp->if_name, ifp->if_unit);
 504         }
 505         return error;
 506 }
 507
 508 int
 509 ether_detach_inet(
 510         struct ifnet *ifp,
 511         u_long proto_family)
 512 {
 513     int         stat;
 514
 515         stat = dlil_detach_protocol(ifp, proto_family);
 516
 517     return stat;
 518 }
 519