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 int gif_attach_inet(struct ifnet *ifp, u_long *dl_tag) {
 300         *dl_tag = gif_attach_proto_family(ifp, AF_INET);
 301         return 0;
 302 }
 303
 304 int gif_detach_inet(struct ifnet *ifp, u_long dl_tag) {
 305         gif_detach_proto_family(ifp, AF_INET);
 306         return 0;
 307 }
 308
 309 int gif_attach_inet6(struct ifnet *ifp, u_long *dl_tag) {
 310         *dl_tag = gif_attach_proto_family(ifp, AF_INET6);
 311         return 0;
 312 }
 313
 314 int gif_detach_inet6(struct ifnet *ifp, u_long dl_tag) {
 315         gif_detach_proto_family(ifp, AF_INET6);
 316         return 0;
 317 }
 318 #endif
 319
 320 /* Function to setup the first gif interface */
 321 void
 322 gifattach(void)
 323 {
 324         struct dlil_protomod_reg_str gif_protoreg;
 325         int error;
 326
 327         /* Init the list of interfaces */
 328         TAILQ_INIT(&gifs);
 329
 330         gif_reg_if_mods(); /* DLIL modules */
 331
 332         /* Register protocol registration functions */
 333
 334         bzero(&gif_protoreg, sizeof(gif_protoreg));
 335         gif_protoreg.attach_proto = gif_attach_inet;
 336         gif_protoreg.detach_proto = gif_detach_inet;
 337
 338         if ( error = dlil_reg_proto_module(AF_INET, APPLE_IF_FAM_GIF, &gif_protoreg) != 0)
 339                 printf("dlil_reg_proto_module failed for AF_INET error=%d\n", error);
 340
 341         gif_protoreg.attach_proto = gif_attach_inet6;
 342         gif_protoreg.detach_proto = gif_detach_inet6;
 343
 344         if ( error = dlil_reg_proto_module(AF_INET6, APPLE_IF_FAM_GIF, &gif_protoreg) != 0)
 345                 printf("dlil_reg_proto_module failed for AF_INET6 error=%d\n", error);
 346
 347
 348         /* Create first device */
 349         gif_create_dev();
 350 }
 351
 352 /* Creates another gif device if there are none free */
 353 static void
 354 gif_create_dev(void)
 355 {
 356         struct gif_softc *sc;
 357
 358
 359         /* Can't create more than GIF_MAXUNIT */
 360         if (ngif >= GIF_MAXUNIT)
 361                 return;
 362
 363         /* Check for unused gif interface */
 364         TAILQ_FOREACH(sc, &gifs, gif_link) {
 365                 /* If unused, return, no need to create a new interface */
 366                 if ((sc->gif_if.if_flags & IFF_RUNNING) == 0)
 367                         return;
 368         }
 369
 370         sc = _MALLOC(sizeof(struct gif_softc), M_DEVBUF, M_WAITOK);
 371         if (sc == NULL) {
 372                 log(LOG_ERR, "gifattach: failed to allocate gif%d\n", ngif);
 373                 return;
 374         }
 375
 376         bzero(sc, sizeof(struct gif_softc));
 377         sc->gif_if.if_softc     = sc;
 378         sc->gif_if.if_name      = GIFNAME;
 379         sc->gif_if.if_unit      = ngif;
 380
 381         sc->encap_cookie4 = sc->encap_cookie6 = NULL;
 382 #ifdef INET
 383         sc->encap_cookie4 = encap_attach_func(AF_INET, -1,
 384             gif_encapcheck, &in_gif_protosw, sc);
 385         if (sc->encap_cookie4 == NULL) {
 386                 printf("%s: unable to attach encap4\n", if_name(&sc->gif_if));
 387                 FREE(sc, M_DEVBUF);
 388                 return;
 389         }
 390 #endif
 391 #ifdef INET6
 392         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1,
 393             gif_encapcheck, (struct protosw*)&in6_gif_protosw, sc);
 394         if (sc->encap_cookie6 == NULL) {
 395                 if (sc->encap_cookie4) {
 396                         encap_detach(sc->encap_cookie4);
 397                         sc->encap_cookie4 = NULL;
 398                 }
 399                 printf("%s: unable to attach encap6\n", if_name(&sc->gif_if));
 400                 FREE(sc, M_DEVBUF);
 401                 return;
 402         }
 403 #endif
 404
 405         sc->gif_if.if_family= APPLE_IF_FAM_GIF;
 406         sc->gif_if.if_mtu       = GIF_MTU;
 407         sc->gif_if.if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
 408 #if 0
 409         /* turn off ingress filter */
 410         sc->gif_if.if_flags  |= IFF_LINK2;
 411 #endif
 412         sc->gif_if.if_ioctl     = gif_ioctl;
 413         sc->gif_if.if_output = NULL;    /* pre_output returns error or EJUSTRETURN */
 414         sc->gif_if.if_type   = IFT_GIF;
 415         dlil_if_attach(&sc->gif_if);
 416         bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
 417         TAILQ_INSERT_TAIL(&gifs, sc, gif_link);
 418         ngif++;
 419 }
 420
 421 static int
 422 gif_encapcheck(m, off, proto, arg)
 423         const struct mbuf *m;
 424         int off;
 425         int proto;
 426         void *arg;
 427 {
 428         struct ip ip;
 429         struct gif_softc *sc;
 430
 431         sc = (struct gif_softc *)arg;
 432         if (sc == NULL)
 433                 return 0;
 434
 435         if ((sc->gif_if.if_flags & IFF_UP) == 0)
 436                 return 0;
 437
 438         /* no physical address */
 439         if (!sc->gif_psrc || !sc->gif_pdst)
 440                 return 0;
 441
 442         switch (proto) {
 443 #if INET
 444         case IPPROTO_IPV4:
 445                 break;
 446 #endif
 447 #if INET6
 448         case IPPROTO_IPV6:
 449                 break;
 450 #endif
 451         default:
 452                 return 0;
 453         }
 454
 455         /* LINTED const cast */
 456         m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
 457
 458         switch (ip.ip_v) {
 459 #if INET
 460         case 4:
 461                 if (sc->gif_psrc->sa_family != AF_INET ||
 462                     sc->gif_pdst->sa_family != AF_INET)
 463                         return 0;
 464                 return gif_encapcheck4(m, off, proto, arg);
 465 #endif
 466 #if INET6
 467         case 6:
 468                 if (sc->gif_psrc->sa_family != AF_INET6 ||
 469                     sc->gif_pdst->sa_family != AF_INET6)
 470                         return 0;
 471                 return gif_encapcheck6(m, off, proto, arg);
 472 #endif
 473         default:
 474                 return 0;
 475         }
 476 }
 477
 478 int
 479 gif_pre_output(ifp, m0, dst, rt, frame, address, dl_tag)
 480         struct ifnet *ifp;
 481         struct mbuf **m0;
 482         struct sockaddr *dst;
 483         caddr_t rt;
 484         char *frame;
 485         char *address;
 486         u_long dl_tag;
 487 {
 488         struct gif_softc *sc = (struct gif_softc*)ifp;
 489         register struct mbuf * m = *m0;
 490         int error = 0;
 491         static int called = 0;  /* XXX: MUTEX */
 492
 493         /*
 494          * gif may cause infinite recursion calls when misconfigured.
 495          * We'll prevent this by introducing upper limit.
 496          * XXX: this mechanism may introduce another problem about
 497          *      mutual exclusion of the variable CALLED, especially if we
 498          *      use kernel thread.
 499          */
 500         if (++called > max_gif_nesting) {
 501                 log(LOG_NOTICE,
 502                     "gif_output: recursively called too many times(%d)\n",
 503                     called);
 504                 m_freem(m);     /* free it here not in dlil_output*/
 505                 error = EIO;    /* is there better errno? */
 506                 goto end;
 507         }
 508
 509         getmicrotime(&ifp->if_lastchange);
 510         m->m_flags &= ~(M_BCAST|M_MCAST);
 511         if (!(ifp->if_flags & IFF_UP) ||
 512             sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
 513                 m_freem(m);     /* free it here not in dlil_output */
 514                 error = ENETDOWN;
 515                 goto end;
 516         }
 517
 518         if (ifp->if_bpf) {
 519                 /*
 520                  * We need to prepend the address family as
 521                  * a four byte field.  Cons up a dummy header
 522                  * to pacify bpf.  This is safe because bpf
 523                  * will only read from the mbuf (i.e., it won't
 524                  * try to free it or keep a pointer a to it).
 525                  */
 526                 struct mbuf m0;
 527                 u_int32_t af = dst->sa_family;
 528
 529                 m0.m_next = m;
 530                 m0.m_len = 4;
 531                 m0.m_data = (char *)&af;
 532
 533                 bpf_mtap(ifp, &m0);
 534         }
 535         ifp->if_opackets++;
 536         ifp->if_obytes += m->m_pkthdr.len;
 537
 538         /* inner AF-specific encapsulation */
 539
 540         /* XXX should we check if our outer source is legal? */
 541
 542         /* dispatch to output logic based on outer AF */
 543         switch (sc->gif_psrc->sa_family) {
 544 #if INET
 545         case AF_INET:
 546                 error = in_gif_output(ifp, dst->sa_family, m, (struct rtentry*)rt);
 547                 break;
 548 #endif
 549 #if INET6
 550         case AF_INET6:
 551                 error = in6_gif_output(ifp, dst->sa_family, m, (struct rtentry*)rt);
 552                 break;
 553 #endif
 554         default:
 555                 error = ENETDOWN;
 556                 goto end;
 557         }
 558
 559   end:
 560         called = 0;             /* reset recursion counter */
 561         if (error) {
 562                 /* the mbuf was freed either by in_gif_output or in here */
 563                 *m0 = NULL; /* avoid getting dlil_output freeing it */
 564                 ifp->if_oerrors++;
 565         }
 566         if (error == 0)
 567                 error = EJUSTRETURN; /* if no error, packet got sent already */
 568         return error;
 569 }
 570
 571 int
 572 gif_input(m, frame_header, gifp, dl_tag, sync_ok)
 573         struct mbuf *m;
 574         char* frame_header;
 575         struct ifnet* gifp;
 576         u_long dl_tag;
 577         int sync_ok;
 578 {
 579         int s, isr;
 580         struct ifqueue *ifq = 0;
 581         int af;
 582
 583         if (gifp == NULL) {
 584                 /* just in case */
 585                 m_freem(m);
 586                 return;
 587         }
 588
 589         /* Assume packet is of type of protocol attached to this interface */
 590         af = ((struct gif_softc*)(gifp->if_softc))->gif_proto->protocol_family;
 591
 592         if (m->m_pkthdr.rcvif)
 593                 m->m_pkthdr.rcvif = gifp;
 594
 595         if (gifp->if_bpf) {
 596                 /*
 597                  * We need to prepend the address family as
 598                  * a four byte field.  Cons up a dummy header
 599                  * to pacify bpf.  This is safe because bpf
 600                  * will only read from the mbuf (i.e., it won't
 601                  * try to free it or keep a pointer a to it).
 602                  */
 603                 struct mbuf m0;
 604                 u_int32_t af1 = af;
 605
 606                 m0.m_next = m;
 607                 m0.m_len = 4;
 608                 m0.m_data = (char *)&af1;
 609
 610                 bpf_mtap(gifp, &m0);
 611         }
 612
 613         /*
 614          * Put the packet to the network layer input queue according to the
 615          * specified address family.
 616          * Note: older versions of gif_input directly called network layer
 617          * input functions, e.g. ip6_input, here. We changed the policy to
 618          * prevent too many recursive calls of such input functions, which
 619          * might cause kernel panic. But the change may introduce another
 620          * problem; if the input queue is full, packets are discarded.
 621          * We believed it rarely occurs and changed the policy. If we find
 622          * it occurs more times than we thought, we may change the policy
 623          * again.
 624          */
 625         switch (af) {
 626 #if INET
 627         case AF_INET:
 628                 ifq = &ipintrq;
 629                 isr = NETISR_IP;
 630                 break;
 631 #endif
 632 #if INET6
 633         case AF_INET6:
 634                 ifq = &ip6intrq;
 635                 isr = NETISR_IPV6;
 636                 break;
 637 #endif
 638         default:
 639                 m_freem(m);
 640                 return (EJUSTRETURN);
 641         }
 642
 643         s = splimp();
 644         if (IF_QFULL(ifq)) {
 645                 IF_DROP(ifq);   /* update statistics */
 646                 m_freem(m);
 647                 splx(s);
 648                 return (EJUSTRETURN);
 649         }
 650         IF_ENQUEUE(ifq, m);
 651         /* we need schednetisr since the address family may change */
 652         schednetisr(isr);
 653         gifp->if_ipackets++;
 654         gifp->if_ibytes += m->m_pkthdr.len;
 655         splx(s);
 656
 657         return (0);
 658 }
 659
 660 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
 661 int
 662 gif_ioctl(ifp, cmd, data)
 663         struct ifnet *ifp;
 664         u_long cmd;
 665         void* data;
 666 {
 667         struct gif_softc *sc  = (struct gif_softc*)ifp;
 668         struct ifreq     *ifr = (struct ifreq*)data;
 669         int error = 0, size;
 670         struct sockaddr *dst, *src;
 671         struct sockaddr *sa;
 672         int s;
 673         struct ifnet *ifp2;
 674         struct gif_softc *sc2;
 675
 676         switch (cmd) {
 677         case SIOCSIFADDR:
 678                 break;
 679
 680         case SIOCSIFDSTADDR:
 681                 break;
 682
 683         case SIOCADDMULTI:
 684         case SIOCDELMULTI:
 685                 break;
 686
 687 #ifdef  SIOCSIFMTU /* xxx */
 688         case SIOCGIFMTU:
 689                 break;
 690
 691         case SIOCSIFMTU:
 692                 {
 693                         u_long mtu;
 694                         mtu = ifr->ifr_mtu;
 695                         if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) {
 696                                 return (EINVAL);
 697                         }
 698                         ifp->if_mtu = mtu;
 699                 }
 700                 break;
 701 #endif /* SIOCSIFMTU */
 702
 703         case SIOCSIFPHYADDR:
 704 #if INET6
 705         case SIOCSIFPHYADDR_IN6:
 706 #endif /* INET6 */
 707         case SIOCSLIFPHYADDR:
 708                 switch (cmd) {
 709 #if INET
 710                 case SIOCSIFPHYADDR:
 711                         src = (struct sockaddr *)
 712                                 &(((struct in_aliasreq *)data)->ifra_addr);
 713                         dst = (struct sockaddr *)
 714                                 &(((struct in_aliasreq *)data)->ifra_dstaddr);
 715                         break;
 716 #endif
 717 #if INET6
 718                 case SIOCSIFPHYADDR_IN6:
 719                         src = (struct sockaddr *)
 720                                 &(((struct in6_aliasreq *)data)->ifra_addr);
 721                         dst = (struct sockaddr *)
 722                                 &(((struct in6_aliasreq *)data)->ifra_dstaddr);
 723                         break;
 724 #endif
 725                 case SIOCSLIFPHYADDR:
 726                         src = (struct sockaddr *)
 727                                 &(((struct if_laddrreq *)data)->addr);
 728                         dst = (struct sockaddr *)
 729                                 &(((struct if_laddrreq *)data)->dstaddr);
 730                 }
 731
 732                 /* sa_family must be equal */
 733                 if (src->sa_family != dst->sa_family)
 734                         return EINVAL;
 735
 736                 /* validate sa_len */
 737                 switch (src->sa_family) {
 738 #if INET
 739                 case AF_INET:
 740                         if (src->sa_len != sizeof(struct sockaddr_in))
 741                                 return EINVAL;
 742                         break;
 743 #endif
 744 #if INET6
 745                 case AF_INET6:
 746                         if (src->sa_len != sizeof(struct sockaddr_in6))
 747                                 return EINVAL;
 748                         break;
 749 #endif
 750                 default:
 751                         return EAFNOSUPPORT;
 752                 }
 753                 switch (dst->sa_family) {
 754 #if INET
 755                 case AF_INET:
 756                         if (dst->sa_len != sizeof(struct sockaddr_in))
 757                                 return EINVAL;
 758                         break;
 759 #endif
 760 #if INET6
 761                 case AF_INET6:
 762                         if (dst->sa_len != sizeof(struct sockaddr_in6))
 763                                 return EINVAL;
 764                         break;
 765 #endif
 766                 default:
 767                         return EAFNOSUPPORT;
 768                 }
 769
 770                 /* check sa_family looks sane for the cmd */
 771                 switch (cmd) {
 772                 case SIOCSIFPHYADDR:
 773                         if (src->sa_family == AF_INET)
 774                                 break;
 775                         return EAFNOSUPPORT;
 776 #if INET6
 777                 case SIOCSIFPHYADDR_IN6:
 778                         if (src->sa_family == AF_INET6)
 779                                 break;
 780                         return EAFNOSUPPORT;
 781 #endif /* INET6 */
 782                 case SIOCSLIFPHYADDR:
 783                         /* checks done in the above */
 784                         break;
 785                 }
 786
 787                 TAILQ_FOREACH(ifp2, &ifnet, if_link) {
 788                         if (strcmp(ifp2->if_name, GIFNAME) != 0)
 789                                 continue;
 790                         sc2 = ifp2->if_softc;
 791                         if (sc2 == sc)
 792                                 continue;
 793                         if (!sc2->gif_pdst || !sc2->gif_psrc)
 794                                 continue;
 795                         if (sc2->gif_pdst->sa_family != dst->sa_family ||
 796                             sc2->gif_pdst->sa_len != dst->sa_len ||
 797                             sc2->gif_psrc->sa_family != src->sa_family ||
 798                             sc2->gif_psrc->sa_len != src->sa_len)
 799                                 continue;
 800 #ifndef XBONEHACK
 801                         /* can't configure same pair of address onto two gifs */
 802                         if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
 803                             bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
 804                                 error = EADDRNOTAVAIL;
 805                                 goto bad;
 806                         }
 807 #endif
 808
 809                         /* can't configure multiple multi-dest interfaces */
 810 #define multidest(x) \
 811         (((struct sockaddr_in *)(x))->sin_addr.s_addr == INADDR_ANY)
 812 #if INET6
 813 #define multidest6(x) \
 814         (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(x))->sin6_addr))
 815 #endif
 816                         if (dst->sa_family == AF_INET &&
 817                             multidest(dst) && multidest(sc2->gif_pdst)) {
 818                                 error = EADDRNOTAVAIL;
 819                                 goto bad;
 820                         }
 821 #if INET6
 822                         if (dst->sa_family == AF_INET6 &&
 823                             multidest6(dst) && multidest6(sc2->gif_pdst)) {
 824                                 error = EADDRNOTAVAIL;
 825                                 goto bad;
 826                         }
 827 #endif
 828                 }
 829
 830                 if (sc->gif_psrc)
 831                         FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 832                 sa = (struct sockaddr *)_MALLOC(src->sa_len, M_IFADDR, M_WAITOK);
 833                 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
 834                 sc->gif_psrc = sa;
 835
 836                 if (sc->gif_pdst)
 837                         FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 838                 sa = (struct sockaddr *)_MALLOC(dst->sa_len, M_IFADDR, M_WAITOK);
 839                 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
 840                 sc->gif_pdst = sa;
 841
 842                 ifp->if_flags |= IFF_RUNNING;
 843
 844                 gif_attach_proto_family(ifp, src->sa_family);
 845
 846                 s = splimp();
 847                 if_up(ifp);     /* mark interface UP and send up RTM_IFINFO */
 848 #ifdef __APPLE__
 849                 /* Make sure at least one unused device is still available */
 850                 gif_create_dev();
 851 #endif
 852                 splx(s);
 853
 854                 error = 0;
 855                 break;
 856
 857 #ifdef SIOCDIFPHYADDR
 858         case SIOCDIFPHYADDR:
 859                 if (sc->gif_psrc) {
 860                         FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 861                         sc->gif_psrc = NULL;
 862                 }
 863                 if (sc->gif_pdst) {
 864                         FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 865                         sc->gif_pdst = NULL;
 866                 }
 867                 /* change the IFF_{UP, RUNNING} flag as well? */
 868                 break;
 869 #endif
 870
 871         case SIOCGIFPSRCADDR:
 872 #if INET6
 873         case SIOCGIFPSRCADDR_IN6:
 874 #endif /* INET6 */
 875                 if (sc->gif_psrc == NULL) {
 876                         error = EADDRNOTAVAIL;
 877                         goto bad;
 878                 }
 879                 src = sc->gif_psrc;
 880                 switch (cmd) {
 881 #if INET
 882                 case SIOCGIFPSRCADDR:
 883                         dst = &ifr->ifr_addr;
 884                         size = sizeof(ifr->ifr_addr);
 885                         break;
 886 #endif /* INET */
 887 #if INET6
 888                 case SIOCGIFPSRCADDR_IN6:
 889                         dst = (struct sockaddr *)
 890                                 &(((struct in6_ifreq *)data)->ifr_addr);
 891                         size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
 892                         break;
 893 #endif /* INET6 */
 894                 default:
 895                         error = EADDRNOTAVAIL;
 896                         goto bad;
 897                 }
 898                 if (src->sa_len > size)
 899                         return EINVAL;
 900                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 901                 break;
 902
 903         case SIOCGIFPDSTADDR:
 904 #if INET6
 905         case SIOCGIFPDSTADDR_IN6:
 906 #endif /* INET6 */
 907                 if (sc->gif_pdst == NULL) {
 908                         error = EADDRNOTAVAIL;
 909                         goto bad;
 910                 }
 911                 src = sc->gif_pdst;
 912                 switch (cmd) {
 913 #if INET
 914                 case SIOCGIFPDSTADDR:
 915                         dst = &ifr->ifr_addr;
 916                         size = sizeof(ifr->ifr_addr);
 917                         break;
 918 #endif /* INET */
 919 #if INET6
 920                 case SIOCGIFPDSTADDR_IN6:
 921                         dst = (struct sockaddr *)
 922                                 &(((struct in6_ifreq *)data)->ifr_addr);
 923                         size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
 924                         break;
 925 #endif /* INET6 */
 926                 default:
 927                         error = EADDRNOTAVAIL;
 928                         goto bad;
 929                 }
 930                 if (src->sa_len > size)
 931                         return EINVAL;
 932                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 933                 break;
 934
 935         case SIOCGLIFPHYADDR:
 936                 if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
 937                         error = EADDRNOTAVAIL;
 938                         goto bad;
 939                 }
 940
 941                 /* copy src */
 942                 src = sc->gif_psrc;
 943                 dst = (struct sockaddr *)
 944                         &(((struct if_laddrreq *)data)->addr);
 945                 size = sizeof(((struct if_laddrreq *)data)->addr);
 946                 if (src->sa_len > size)
 947                         return EINVAL;
 948                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 949
 950                 /* copy dst */
 951                 src = sc->gif_pdst;
 952                 dst = (struct sockaddr *)
 953                         &(((struct if_laddrreq *)data)->dstaddr);
 954                 size = sizeof(((struct if_laddrreq *)data)->dstaddr);
 955                 if (src->sa_len > size)
 956                         return EINVAL;
 957                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 958                 break;
 959
 960         case SIOCSIFFLAGS:
 961                 /* if_ioctl() takes care of it */
 962                 break;
 963
 964         default:
 965                 error = EOPNOTSUPP;
 966                 break;
 967         }
 968  bad:
 969         return error;
 970 }
 971
 972 void
 973 gif_delete_tunnel(sc)
 974         struct gif_softc *sc;
 975 {
 976         /* XXX: NetBSD protects this function with splsoftnet() */
 977
 978         if (sc->gif_psrc) {
 979                 FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 980                 sc->gif_psrc = NULL;
 981         }
 982         if (sc->gif_pdst) {
 983                 FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 984                 sc->gif_pdst = NULL;
 985         }
 986         /* change the IFF_UP flag as well? */
 987 }