bsd/net/if_gif.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 /*      $FreeBSD: src/sys/net/if_gif.c,v 1.4.2.6 2001/07/24 19:10:18 brooks Exp $       */
  26 /*      $KAME: if_gif.c,v 1.47 2001/05/01 05:28:42 itojun Exp $ */
  27
  28 /*
  29  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  30  * 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. Neither the name of the project nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57 #include <sys/param.h>
  58 #include <sys/systm.h>
  59 #include <sys/kernel.h>
  60 #include <sys/malloc.h>
  61 #include <sys/mbuf.h>
  62 #include <sys/socket.h>
  63 #include <sys/sockio.h>
  64 #include <sys/errno.h>
  65 #include <sys/time.h>
  66 #include <sys/syslog.h>
  67 #include <sys/protosw.h>
  68 #include <kern/cpu_number.h>
  69
  70 #include <net/if.h>
  71 #include <net/if_types.h>
  72 #include <net/netisr.h>
  73 #include <net/route.h>
  74 #include <net/bpf.h>
  75
  76 #include <netinet/in.h>
  77 #include <netinet/in_systm.h>
  78 #include <netinet/ip.h>
  79 #if     INET
  80 #include <netinet/in_var.h>
  81 #include <netinet/in_gif.h>
  82 #include <netinet/ip_var.h>
  83 #endif  /* INET */
  84
  85 #if INET6
  86 #include <netinet6/in6_var.h>
  87 #include <netinet/ip6.h>
  88 #include <netinet6/ip6_var.h>
  89 #include <netinet6/in6_gif.h>
  90 #include <netinet6/ip6protosw.h>
  91 #endif /* INET6 */
  92
  93 #include <netinet/ip_encap.h>
  94 #include <net/dlil.h>
  95 #include <net/if_gif.h>
  96
  97 #include <net/net_osdep.h>
  98
  99 #define GIFNAME         "gif"
 100 #define GIFDEV          "if_gif"
 101 #define GIF_MAXUNIT     0x7fff  /* ifp->if_unit is only 15 bits */
 102
 103 #ifndef __APPLE__
 104 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
 105 #endif
 106
 107 TAILQ_HEAD(gifhead, gif_softc) gifs = TAILQ_HEAD_INITIALIZER(gifs);
 108
 109 #ifdef __APPLE__
 110 void gifattach __P((void));
 111 int gif_pre_output __P((struct ifnet *, register struct mbuf **, struct sockaddr *,
 112         caddr_t, char *, char *, u_long));
 113 static void gif_create_dev(void);
 114 static int gif_encapcheck(const struct mbuf*, int, int, void*);
 115
 116
 117 int ngif = 0;           /* number of interfaces */
 118 #endif
 119
 120 #if INET
 121 struct protosw in_gif_protosw =
 122 { SOCK_RAW,     0,      0/*IPPROTO_IPV[46]*/,   PR_ATOMIC|PR_ADDR,
 123   in_gif_input, 0,      0,              0,
 124   0,
 125   0,            0,              0,              0,
 126   0,
 127   &rip_usrreqs
 128 };
 129 #endif
 130 #if INET6
 131 struct ip6protosw in6_gif_protosw =
 132 { SOCK_RAW,     0,      0/*IPPROTO_IPV[46]*/,   PR_ATOMIC|PR_ADDR,
 133   in6_gif_input,
 134   0,    0,              0,
 135   0,
 136   0,            0,              0,              0,
 137   0,
 138   &rip6_usrreqs
 139 };
 140 #endif
 141
 142 #ifndef MAX_GIF_NEST
 143 /*
 144  * This macro controls the upper limitation on nesting of gif tunnels.
 145  * Since, setting a large value to this macro with a careless configuration
 146  * may introduce system crash, we don't allow any nestings by default.
 147  * If you need to configure nested gif tunnels, you can define this macro
 148  * in your kernel configuration file. However, if you do so, please be
 149  * careful to configure the tunnels so that it won't make a loop.
 150  */
 151 #define MAX_GIF_NEST 1
 152 #endif
 153 static int max_gif_nesting = MAX_GIF_NEST;
 154
 155
 156
 157 #ifdef __APPLE__
 158 /*
 159  * Theory of operation: initially, one gif interface is created.
 160  * Any time a gif interface is configured, if there are no other
 161  * unconfigured gif interfaces, a new gif interface is created.
 162  * BSD uses the clone mechanism to dynamically create more
 163  * gif interfaces.
 164  *
 165  * We have some extra glue to support DLIL.
 166  */
 167
 168 /* GIF interface module support */
 169 int gif_demux(ifp, m, frame_header, proto)
 170     struct ifnet *ifp;
 171     struct mbuf  *m;
 172     char         *frame_header;
 173     struct if_proto **proto;
 174 {
 175         struct gif_softc* gif = (struct gif_softc*)ifp->if_softc;
 176
 177         /* Only one protocol may be attached to a gif interface. */
 178         *proto = gif->gif_proto;
 179
 180         return 0;
 181 }
 182
 183 static
 184 int  gif_add_if(struct ifnet *ifp)
 185 {
 186     ifp->if_demux  = gif_demux;
 187     ifp->if_framer = 0;
 188     return 0;
 189 }
 190
 191 static
 192 int  gif_del_if(struct ifnet *ifp)
 193 {
 194     return 0;
 195 }
 196
 197 static
 198 int  gif_add_proto(struct ddesc_head_str *desc_head, struct if_proto *proto, u_long dl_tag)
 199 {
 200         /* Only one protocol may be attached at a time */
 201         struct gif_softc* gif = (struct gif_softc*)proto->ifp;
 202
 203         if (gif->gif_proto != NULL)
 204                 printf("gif_add_proto: request add_proto for gif%d\n", gif->gif_if.if_unit);
 205
 206         gif->gif_proto = proto;
 207
 208         return 0;
 209 }
 210
 211 static
 212 int  gif_del_proto(struct if_proto *proto, u_long dl_tag)
 213 {
 214         if (((struct gif_softc*)proto->ifp)->gif_proto == proto)
 215                 ((struct gif_softc*)proto->ifp)->gif_proto = NULL;
 216         else
 217                 return ENOENT;
 218
 219         return 0;
 220 }
 221
 222 int gif_shutdown()
 223 {
 224         return 0;
 225 }
 226
 227 void gif_reg_if_mods()
 228 {
 229      struct dlil_ifmod_reg_str  gif_ifmod;
 230
 231      bzero(&gif_ifmod, sizeof(gif_ifmod));
 232      gif_ifmod.add_if = gif_add_if;
 233      gif_ifmod.del_if = gif_del_if;
 234      gif_ifmod.add_proto = gif_add_proto;
 235      gif_ifmod.del_proto = gif_del_proto;
 236      gif_ifmod.ifmod_ioctl = 0;
 237      gif_ifmod.shutdown    = gif_shutdown;
 238
 239     if (dlil_reg_if_modules(APPLE_IF_FAM_GIF, &gif_ifmod))
 240         panic("Couldn't register gif modules\n");
 241
 242 }
 243
 244 /* Glue code to attach inet to a gif interface through DLIL */
 245
 246 u_long  gif_attach_proto_family(struct ifnet *ifp, int af)
 247 {
 248     struct dlil_proto_reg_str   reg;
 249     struct dlil_demux_desc      desc;
 250     u_long                      dl_tag=0;
 251     short native=0;
 252     int   stat;
 253
 254         /* Check if we're already attached */
 255         stat = dlil_find_dltag(ifp->if_family, ifp->if_unit, af, &dl_tag);
 256         if (stat == 0)
 257                 return dl_tag;
 258
 259     TAILQ_INIT(&reg.demux_desc_head);
 260     desc.type = DLIL_DESC_RAW;
 261     desc.variants.bitmask.proto_id_length = 0;
 262     desc.variants.bitmask.proto_id = 0;
 263     desc.variants.bitmask.proto_id_mask = 0;
 264     desc.native_type = (char *) &native;
 265     TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
 266     reg.interface_family = ifp->if_family;
 267     reg.unit_number      = ifp->if_unit;
 268     reg.input            = gif_input;
 269     reg.pre_output       = gif_pre_output;
 270     reg.event            = 0;
 271     reg.offer            = 0;
 272     reg.ioctl            = 0;
 273     reg.default_proto    = 0;
 274     reg.protocol_family  = af;
 275
 276     stat = dlil_attach_protocol(&reg, &dl_tag);
 277     if (stat) {
 278         panic("gif_attach_proto_family can't attach interface fam=%d\n", af);
 279     }
 280
 281     return dl_tag;
 282 }
 283
 284 u_long  gif_detach_proto_family(struct ifnet *ifp, int af)
 285 {
 286     u_long      ip_dl_tag = 0;
 287     int         stat;
 288
 289     stat = dlil_find_dltag(ifp->if_family, ifp->if_unit, af, &ip_dl_tag);
 290     if (stat == 0) {
 291         stat = dlil_detach_protocol(ip_dl_tag);
 292         if (stat) {
 293             printf("WARNING: gif_detach can't detach IP fam=%d from interface\n", af);
 294         }
 295     }
 296     return (stat);
 297 }
 298
 299 #endif
 300
 301 /* Function to setup the first gif interface */
 302 void
 303 gifattach(void)
 304 {
 305         /* Init the list of interfaces */
 306         TAILQ_INIT(&gifs);
 307
 308         gif_reg_if_mods(); /* DLIL modules */
 309
 310         /* Create first device */
 311         gif_create_dev();
 312 }
 313
 314 /* Creates another gif device if there are none free */
 315 static void
 316 gif_create_dev(void)
 317 {
 318         struct gif_softc *sc;
 319
 320
 321         /* Can't create more than GIF_MAXUNIT */
 322         if (ngif >= GIF_MAXUNIT)
 323                 return;
 324
 325         /* Check for unused gif interface */
 326         TAILQ_FOREACH(sc, &gifs, gif_link) {
 327                 /* If unused, return, no need to create a new interface */
 328                 if ((sc->gif_if.if_flags & IFF_RUNNING) == 0)
 329                         return;
 330         }
 331
 332         sc = _MALLOC(sizeof(struct gif_softc), M_DEVBUF, M_WAITOK);
 333         if (sc == NULL) {
 334                 log(LOG_ERR, "gifattach: failed to allocate gif%d\n", ngif);
 335                 return;
 336         }
 337
 338         bzero(sc, sizeof(struct gif_softc));
 339         sc->gif_if.if_softc     = sc;
 340         sc->gif_if.if_name      = GIFNAME;
 341         sc->gif_if.if_unit      = ngif;
 342
 343         sc->encap_cookie4 = sc->encap_cookie6 = NULL;
 344 #ifdef INET
 345         sc->encap_cookie4 = encap_attach_func(AF_INET, -1,
 346             gif_encapcheck, &in_gif_protosw, sc);
 347         if (sc->encap_cookie4 == NULL) {
 348                 printf("%s: unable to attach encap4\n", if_name(&sc->gif_if));
 349                 FREE(sc, M_DEVBUF);
 350                 return;
 351         }
 352 #endif
 353 #ifdef INET6
 354         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1,
 355             gif_encapcheck, (struct protosw*)&in6_gif_protosw, sc);
 356         if (sc->encap_cookie6 == NULL) {
 357                 if (sc->encap_cookie4) {
 358                         encap_detach(sc->encap_cookie4);
 359                         sc->encap_cookie4 = NULL;
 360                 }
 361                 printf("%s: unable to attach encap6\n", if_name(&sc->gif_if));
 362                 FREE(sc, M_DEVBUF);
 363                 return;
 364         }
 365 #endif
 366
 367         sc->gif_if.if_family= APPLE_IF_FAM_GIF;
 368         sc->gif_if.if_mtu       = GIF_MTU;
 369         sc->gif_if.if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
 370 #if 0
 371         /* turn off ingress filter */
 372         sc->gif_if.if_flags  |= IFF_LINK2;
 373 #endif
 374         sc->gif_if.if_ioctl     = gif_ioctl;
 375         sc->gif_if.if_output = NULL;    /* pre_output returns error or EJUSTRETURN */
 376         sc->gif_if.if_type   = IFT_GIF;
 377         dlil_if_attach(&sc->gif_if);
 378         bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
 379         TAILQ_INSERT_TAIL(&gifs, sc, gif_link);
 380         ngif++;
 381 }
 382
 383 static int
 384 gif_encapcheck(m, off, proto, arg)
 385         const struct mbuf *m;
 386         int off;
 387         int proto;
 388         void *arg;
 389 {
 390         struct ip ip;
 391         struct gif_softc *sc;
 392
 393         sc = (struct gif_softc *)arg;
 394         if (sc == NULL)
 395                 return 0;
 396
 397         if ((sc->gif_if.if_flags & IFF_UP) == 0)
 398                 return 0;
 399
 400         /* no physical address */
 401         if (!sc->gif_psrc || !sc->gif_pdst)
 402                 return 0;
 403
 404         switch (proto) {
 405 #if INET
 406         case IPPROTO_IPV4:
 407                 break;
 408 #endif
 409 #if INET6
 410         case IPPROTO_IPV6:
 411                 break;
 412 #endif
 413         default:
 414                 return 0;
 415         }
 416
 417         /* LINTED const cast */
 418         m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
 419
 420         switch (ip.ip_v) {
 421 #if INET
 422         case 4:
 423                 if (sc->gif_psrc->sa_family != AF_INET ||
 424                     sc->gif_pdst->sa_family != AF_INET)
 425                         return 0;
 426                 return gif_encapcheck4(m, off, proto, arg);
 427 #endif
 428 #if INET6
 429         case 6:
 430                 if (sc->gif_psrc->sa_family != AF_INET6 ||
 431                     sc->gif_pdst->sa_family != AF_INET6)
 432                         return 0;
 433                 return gif_encapcheck6(m, off, proto, arg);
 434 #endif
 435         default:
 436                 return 0;
 437         }
 438 }
 439
 440 int
 441 gif_pre_output(ifp, m0, dst, rt, frame, address, dl_tag)
 442         struct ifnet *ifp;
 443         struct mbuf **m0;
 444         struct sockaddr *dst;
 445         caddr_t rt;
 446         char *frame;
 447         char *address;
 448         u_long dl_tag;
 449 {
 450         struct gif_softc *sc = (struct gif_softc*)ifp;
 451         register struct mbuf * m = *m0;
 452         int error = 0;
 453         static int called = 0;  /* XXX: MUTEX */
 454
 455         /*
 456          * gif may cause infinite recursion calls when misconfigured.
 457          * We'll prevent this by introducing upper limit.
 458          * XXX: this mechanism may introduce another problem about
 459          *      mutual exclusion of the variable CALLED, especially if we
 460          *      use kernel thread.
 461          */
 462         if (++called > max_gif_nesting) {
 463                 log(LOG_NOTICE,
 464                     "gif_output: recursively called too many times(%d)\n",
 465                     called);
 466                 error = EIO;    /* is there better errno? */
 467                 goto end;
 468         }
 469
 470         getmicrotime(&ifp->if_lastchange);
 471         m->m_flags &= ~(M_BCAST|M_MCAST);
 472         if (!(ifp->if_flags & IFF_UP) ||
 473             sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
 474                 error = ENETDOWN;
 475                 goto end;
 476         }
 477
 478         if (ifp->if_bpf) {
 479                 /*
 480                  * We need to prepend the address family as
 481                  * a four byte field.  Cons up a dummy header
 482                  * to pacify bpf.  This is safe because bpf
 483                  * will only read from the mbuf (i.e., it won't
 484                  * try to free it or keep a pointer a to it).
 485                  */
 486                 struct mbuf m0;
 487                 u_int32_t af = dst->sa_family;
 488
 489                 m0.m_next = m;
 490                 m0.m_len = 4;
 491                 m0.m_data = (char *)&af;
 492
 493                 bpf_mtap(ifp, &m0);
 494         }
 495         ifp->if_opackets++;
 496         ifp->if_obytes += m->m_pkthdr.len;
 497
 498         /* inner AF-specific encapsulation */
 499
 500         /* XXX should we check if our outer source is legal? */
 501
 502         /* dispatch to output logic based on outer AF */
 503         switch (sc->gif_psrc->sa_family) {
 504 #if INET
 505         case AF_INET:
 506                 error = in_gif_output(ifp, dst->sa_family, m, (struct rtentry*)rt);
 507                 break;
 508 #endif
 509 #if INET6
 510         case AF_INET6:
 511                 error = in6_gif_output(ifp, dst->sa_family, m, (struct rtentry*)rt);
 512                 break;
 513 #endif
 514         default:
 515                 error = ENETDOWN;
 516                 goto end;
 517         }
 518
 519   end:
 520         called = 0;             /* reset recursion counter */
 521         if (error)
 522                 ifp->if_oerrors++;
 523         if (error == 0)
 524                 error = EJUSTRETURN; /* if no error, packet got sent already */
 525         return error;
 526 }
 527
 528 int
 529 gif_input(m, frame_header, gifp, dl_tag, sync_ok)
 530         struct mbuf *m;
 531         char* frame_header;
 532         struct ifnet* gifp;
 533         u_long dl_tag;
 534         int sync_ok;
 535 {
 536         int s, isr;
 537         struct ifqueue *ifq = 0;
 538         int af;
 539
 540         if (gifp == NULL) {
 541                 /* just in case */
 542                 m_freem(m);
 543                 return;
 544         }
 545
 546         /* Assume packet is of type of protocol attached to this interface */
 547         af = ((struct gif_softc*)(gifp->if_softc))->gif_proto->protocol_family;
 548
 549         if (m->m_pkthdr.rcvif)
 550                 m->m_pkthdr.rcvif = gifp;
 551
 552         if (gifp->if_bpf) {
 553                 /*
 554                  * We need to prepend the address family as
 555                  * a four byte field.  Cons up a dummy header
 556                  * to pacify bpf.  This is safe because bpf
 557                  * will only read from the mbuf (i.e., it won't
 558                  * try to free it or keep a pointer a to it).
 559                  */
 560                 struct mbuf m0;
 561                 u_int32_t af1 = af;
 562
 563                 m0.m_next = m;
 564                 m0.m_len = 4;
 565                 m0.m_data = (char *)&af1;
 566
 567                 bpf_mtap(gifp, &m0);
 568         }
 569
 570         /*
 571          * Put the packet to the network layer input queue according to the
 572          * specified address family.
 573          * Note: older versions of gif_input directly called network layer
 574          * input functions, e.g. ip6_input, here. We changed the policy to
 575          * prevent too many recursive calls of such input functions, which
 576          * might cause kernel panic. But the change may introduce another
 577          * problem; if the input queue is full, packets are discarded.
 578          * We believed it rarely occurs and changed the policy. If we find
 579          * it occurs more times than we thought, we may change the policy
 580          * again.
 581          */
 582         switch (af) {
 583 #if INET
 584         case AF_INET:
 585                 ifq = &ipintrq;
 586                 isr = NETISR_IP;
 587                 break;
 588 #endif
 589 #if INET6
 590         case AF_INET6:
 591                 ifq = &ip6intrq;
 592                 isr = NETISR_IPV6;
 593                 break;
 594 #endif
 595         default:
 596                 m_freem(m);
 597                 return (EJUSTRETURN);
 598         }
 599
 600         s = splimp();
 601         if (IF_QFULL(ifq)) {
 602                 IF_DROP(ifq);   /* update statistics */
 603                 m_freem(m);
 604                 splx(s);
 605                 return (EJUSTRETURN);
 606         }
 607         IF_ENQUEUE(ifq, m);
 608         /* we need schednetisr since the address family may change */
 609         schednetisr(isr);
 610         gifp->if_ipackets++;
 611         gifp->if_ibytes += m->m_pkthdr.len;
 612         splx(s);
 613
 614         return (0);
 615 }
 616
 617 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
 618 int
 619 gif_ioctl(ifp, cmd, data)
 620         struct ifnet *ifp;
 621         u_long cmd;
 622         void* data;
 623 {
 624         struct gif_softc *sc  = (struct gif_softc*)ifp;
 625         struct ifreq     *ifr = (struct ifreq*)data;
 626         int error = 0, size;
 627         struct sockaddr *dst, *src;
 628         struct sockaddr *sa;
 629         int s;
 630         struct ifnet *ifp2;
 631         struct gif_softc *sc2;
 632
 633         switch (cmd) {
 634         case SIOCSIFADDR:
 635                 break;
 636
 637         case SIOCSIFDSTADDR:
 638                 break;
 639
 640         case SIOCADDMULTI:
 641         case SIOCDELMULTI:
 642                 break;
 643
 644 #ifdef  SIOCSIFMTU /* xxx */
 645         case SIOCGIFMTU:
 646                 break;
 647
 648         case SIOCSIFMTU:
 649                 {
 650                         u_long mtu;
 651                         mtu = ifr->ifr_mtu;
 652                         if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) {
 653                                 return (EINVAL);
 654                         }
 655                         ifp->if_mtu = mtu;
 656                 }
 657                 break;
 658 #endif /* SIOCSIFMTU */
 659
 660         case SIOCSIFPHYADDR:
 661 #if INET6
 662         case SIOCSIFPHYADDR_IN6:
 663 #endif /* INET6 */
 664         case SIOCSLIFPHYADDR:
 665                 switch (cmd) {
 666 #if INET
 667                 case SIOCSIFPHYADDR:
 668                         src = (struct sockaddr *)
 669                                 &(((struct in_aliasreq *)data)->ifra_addr);
 670                         dst = (struct sockaddr *)
 671                                 &(((struct in_aliasreq *)data)->ifra_dstaddr);
 672                         break;
 673 #endif
 674 #if INET6
 675                 case SIOCSIFPHYADDR_IN6:
 676                         src = (struct sockaddr *)
 677                                 &(((struct in6_aliasreq *)data)->ifra_addr);
 678                         dst = (struct sockaddr *)
 679                                 &(((struct in6_aliasreq *)data)->ifra_dstaddr);
 680                         break;
 681 #endif
 682                 case SIOCSLIFPHYADDR:
 683                         src = (struct sockaddr *)
 684                                 &(((struct if_laddrreq *)data)->addr);
 685                         dst = (struct sockaddr *)
 686                                 &(((struct if_laddrreq *)data)->dstaddr);
 687                 }
 688
 689                 /* sa_family must be equal */
 690                 if (src->sa_family != dst->sa_family)
 691                         return EINVAL;
 692
 693                 /* validate sa_len */
 694                 switch (src->sa_family) {
 695 #if INET
 696                 case AF_INET:
 697                         if (src->sa_len != sizeof(struct sockaddr_in))
 698                                 return EINVAL;
 699                         break;
 700 #endif
 701 #if INET6
 702                 case AF_INET6:
 703                         if (src->sa_len != sizeof(struct sockaddr_in6))
 704                                 return EINVAL;
 705                         break;
 706 #endif
 707                 default:
 708                         return EAFNOSUPPORT;
 709                 }
 710                 switch (dst->sa_family) {
 711 #if INET
 712                 case AF_INET:
 713                         if (dst->sa_len != sizeof(struct sockaddr_in))
 714                                 return EINVAL;
 715                         break;
 716 #endif
 717 #if INET6
 718                 case AF_INET6:
 719                         if (dst->sa_len != sizeof(struct sockaddr_in6))
 720                                 return EINVAL;
 721                         break;
 722 #endif
 723                 default:
 724                         return EAFNOSUPPORT;
 725                 }
 726
 727                 /* check sa_family looks sane for the cmd */
 728                 switch (cmd) {
 729                 case SIOCSIFPHYADDR:
 730                         if (src->sa_family == AF_INET)
 731                                 break;
 732                         return EAFNOSUPPORT;
 733 #if INET6
 734                 case SIOCSIFPHYADDR_IN6:
 735                         if (src->sa_family == AF_INET6)
 736                                 break;
 737                         return EAFNOSUPPORT;
 738 #endif /* INET6 */
 739                 case SIOCSLIFPHYADDR:
 740                         /* checks done in the above */
 741                         break;
 742                 }
 743
 744                 TAILQ_FOREACH(ifp2, &ifnet, if_link) {
 745                         if (strcmp(ifp2->if_name, GIFNAME) != 0)
 746                                 continue;
 747                         sc2 = ifp2->if_softc;
 748                         if (sc2 == sc)
 749                                 continue;
 750                         if (!sc2->gif_pdst || !sc2->gif_psrc)
 751                                 continue;
 752                         if (sc2->gif_pdst->sa_family != dst->sa_family ||
 753                             sc2->gif_pdst->sa_len != dst->sa_len ||
 754                             sc2->gif_psrc->sa_family != src->sa_family ||
 755                             sc2->gif_psrc->sa_len != src->sa_len)
 756                                 continue;
 757 #ifndef XBONEHACK
 758                         /* can't configure same pair of address onto two gifs */
 759                         if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
 760                             bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
 761                                 error = EADDRNOTAVAIL;
 762                                 goto bad;
 763                         }
 764 #endif
 765
 766                         /* can't configure multiple multi-dest interfaces */
 767 #define multidest(x) \
 768         (((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY)
 769 #if INET6
 770 #define multidest6(x) \
 771         (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr))
 772 #endif
 773                         if (dst->sa_family == AF_INET &&
 774                             multidest(dst) && multidest(sc2->gif_pdst)) {
 775                                 error = EADDRNOTAVAIL;
 776                                 goto bad;
 777                         }
 778 #if INET6
 779                         if (dst->sa_family == AF_INET6 &&
 780                             multidest6(dst) && multidest6(sc2->gif_pdst)) {
 781                                 error = EADDRNOTAVAIL;
 782                                 goto bad;
 783                         }
 784 #endif
 785                 }
 786
 787                 if (sc->gif_psrc)
 788                         FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 789                 sa = (struct sockaddr *)_MALLOC(src->sa_len, M_IFADDR, M_WAITOK);
 790                 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
 791                 sc->gif_psrc = sa;
 792
 793                 if (sc->gif_pdst)
 794                         FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 795                 sa = (struct sockaddr *)_MALLOC(dst->sa_len, M_IFADDR, M_WAITOK);
 796                 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
 797                 sc->gif_pdst = sa;
 798
 799                 ifp->if_flags |= IFF_RUNNING;
 800
 801                 gif_attach_proto_family(ifp, src->sa_family);
 802
 803                 s = splimp();
 804                 if_up(ifp);     /* mark interface UP and send up RTM_IFINFO */
 805 #ifdef __APPLE__
 806                 /* Make sure at least one unused device is still available */
 807                 gif_create_dev();
 808 #endif
 809                 splx(s);
 810
 811                 error = 0;
 812                 break;
 813
 814 #ifdef SIOCDIFPHYADDR
 815         case SIOCDIFPHYADDR:
 816                 if (sc->gif_psrc) {
 817                         FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 818                         sc->gif_psrc = NULL;
 819                 }
 820                 if (sc->gif_pdst) {
 821                         FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 822                         sc->gif_pdst = NULL;
 823                 }
 824                 /* change the IFF_{UP, RUNNING} flag as well? */
 825                 break;
 826 #endif
 827
 828         case SIOCGIFPSRCADDR:
 829 #if INET6
 830         case SIOCGIFPSRCADDR_IN6:
 831 #endif /* INET6 */
 832                 if (sc->gif_psrc == NULL) {
 833                         error = EADDRNOTAVAIL;
 834                         goto bad;
 835                 }
 836                 src = sc->gif_psrc;
 837                 switch (cmd) {
 838 #if INET
 839                 case SIOCGIFPSRCADDR:
 840                         dst = &ifr->ifr_addr;
 841                         size = sizeof(ifr->ifr_addr);
 842                         break;
 843 #endif /* INET */
 844 #if INET6
 845                 case SIOCGIFPSRCADDR_IN6:
 846                         dst = (struct sockaddr *)
 847                                 &(((struct in6_ifreq *)data)->ifr_addr);
 848                         size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
 849                         break;
 850 #endif /* INET6 */
 851                 default:
 852                         error = EADDRNOTAVAIL;
 853                         goto bad;
 854                 }
 855                 if (src->sa_len > size)
 856                         return EINVAL;
 857                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 858                 break;
 859
 860         case SIOCGIFPDSTADDR:
 861 #if INET6
 862         case SIOCGIFPDSTADDR_IN6:
 863 #endif /* INET6 */
 864                 if (sc->gif_pdst == NULL) {
 865                         error = EADDRNOTAVAIL;
 866                         goto bad;
 867                 }
 868                 src = sc->gif_pdst;
 869                 switch (cmd) {
 870 #if INET
 871                 case SIOCGIFPDSTADDR:
 872                         dst = &ifr->ifr_addr;
 873                         size = sizeof(ifr->ifr_addr);
 874                         break;
 875 #endif /* INET */
 876 #if INET6
 877                 case SIOCGIFPDSTADDR_IN6:
 878                         dst = (struct sockaddr *)
 879                                 &(((struct in6_ifreq *)data)->ifr_addr);
 880                         size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
 881                         break;
 882 #endif /* INET6 */
 883                 default:
 884                         error = EADDRNOTAVAIL;
 885                         goto bad;
 886                 }
 887                 if (src->sa_len > size)
 888                         return EINVAL;
 889                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 890                 break;
 891
 892         case SIOCGLIFPHYADDR:
 893                 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
 894                         error = EADDRNOTAVAIL;
 895                         goto bad;
 896                 }
 897
 898                 /* copy src */
 899                 src = sc->gif_psrc;
 900                 dst = (struct sockaddr *)
 901                         &(((struct if_laddrreq *)data)->addr);
 902                 size = sizeof(((struct if_laddrreq *)data)->addr);
 903                 if (src->sa_len > size)
 904                         return EINVAL;
 905                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 906
 907                 /* copy dst */
 908                 src = sc->gif_pdst;
 909                 dst = (struct sockaddr *)
 910                         &(((struct if_laddrreq *)data)->dstaddr);
 911                 size = sizeof(((struct if_laddrreq *)data)->dstaddr);
 912                 if (src->sa_len > size)
 913                         return EINVAL;
 914                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 915                 break;
 916
 917         case SIOCSIFFLAGS:
 918                 /* if_ioctl() takes care of it */
 919                 break;
 920
 921         default:
 922                 error = EOPNOTSUPP;
 923                 break;
 924         }
 925  bad:
 926         return error;
 927 }
 928
 929 void
 930 gif_delete_tunnel(sc)
 931         struct gif_softc *sc;
 932 {
 933         /* XXX: NetBSD protects this function with splsoftnet() */
 934
 935         if (sc->gif_psrc) {
 936                 FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 937                 sc->gif_psrc = NULL;
 938         }
 939         if (sc->gif_pdst) {
 940                 FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 941                 sc->gif_pdst = NULL;
 942         }
 943         /* change the IFF_UP flag as well? */
 944 }