bsd/net/if_gif.c

   1 /*
   2  * Copyright (c) 2000-2013 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 /* $FreeBSD: src/sys/net/if_gif.c,v 1.4.2.6 2001/07/24 19:10:18 brooks Exp $ */
  29 /* $KAME: if_gif.c,v 1.47 2001/05/01 05:28:42 itojun Exp $ */
  30
  31 /*
  32  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
  33  * All rights reserved.
  34  *
  35  * Redistribution and use in source and binary forms, with or without
  36  * modification, are permitted provided that the following conditions
  37  * are met:
  38  * 1. Redistributions of source code must retain the above copyright
  39  *    notice, this list of conditions and the following disclaimer.
  40  * 2. Redistributions in binary form must reproduce the above copyright
  41  *    notice, this list of conditions and the following disclaimer in the
  42  *    documentation and/or other materials provided with the distribution.
  43  * 3. Neither the name of the project nor the names of its contributors
  44  *    may be used to endorse or promote products derived from this software
  45  *    without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  */
  59 /*
  60  * NOTICE: This file was modified by SPARTA, Inc. in 2006 to introduce
  61  * support for mandatory and extensible security protections.  This notice
  62  * is included in support of clause 2.2 (b) of the Apple Public License,
  63  * Version 2.0.
  64  */
  65
  66 #include <sys/param.h>
  67 #include <sys/systm.h>
  68 #include <sys/kernel.h>
  69 #include <sys/malloc.h>
  70 #include <sys/mbuf.h>
  71 #include <sys/socket.h>
  72 #include <sys/sockio.h>
  73 #include <sys/errno.h>
  74 #include <sys/time.h>
  75 #include <sys/syslog.h>
  76 #include <sys/protosw.h>
  77 #include <kern/cpu_number.h>
  78
  79 #include <net/if.h>
  80 #include <net/if_types.h>
  81 #include <net/route.h>
  82 #include <net/bpf.h>
  83 #include <net/kpi_protocol.h>
  84 #include <net/kpi_interface.h>
  85 #include <net/init.h>
  86
  87 #include <netinet/in.h>
  88 #include <netinet/in_systm.h>
  89 #include <netinet/ip.h>
  90 #if     INET
  91 #include <netinet/in_var.h>
  92 #include <netinet/in_gif.h>
  93 #include <netinet/ip_var.h>
  94 #endif  /* INET */
  95
  96 #if INET6
  97 #include <netinet6/in6_var.h>
  98 #include <netinet/ip6.h>
  99 #include <netinet6/ip6_var.h>
 100 #include <netinet6/in6_gif.h>
 101 #include <netinet6/ip6protosw.h>
 102 #endif /* INET6 */
 103
 104 #include <netinet/ip_encap.h>
 105 #include <net/dlil.h>
 106 #include <net/if_gif.h>
 107
 108 #include <net/net_osdep.h>
 109
 110 #if CONFIG_MACF_NET
 111 #include <security/mac_framework.h>
 112 #endif
 113
 114 #define GIFNAME         "gif"
 115 #define GIFDEV          "if_gif"
 116 #define GIF_MAXUNIT     0x7fff  /* ifp->if_unit is only 15 bits */
 117
 118 /* gif lock variables */
 119 static lck_grp_t        *gif_mtx_grp;
 120 static lck_grp_attr_t   *gif_mtx_grp_attr;
 121 static lck_attr_t       *gif_mtx_attr;
 122 decl_lck_mtx_data(static, gif_mtx_data);
 123 static lck_mtx_t        *gif_mtx = &gif_mtx_data;
 124
 125 TAILQ_HEAD(gifhead, gif_softc) gifs = TAILQ_HEAD_INITIALIZER(gifs);
 126
 127 static int gif_encapcheck(const struct mbuf *, int, int, void *);
 128 static errno_t gif_output(ifnet_t ifp, mbuf_t m);
 129 static errno_t gif_input(ifnet_t ifp, protocol_family_t protocol_family,
 130     mbuf_t m, char *frame_header);
 131 static errno_t gif_ioctl(ifnet_t ifp, u_long cmd, void *data);
 132
 133 static int ngif = 0;            /* number of interfaces */
 134
 135 #if INET
 136 static struct protosw in_gif_protosw =
 137 {
 138         .pr_type =              SOCK_RAW,
 139         .pr_protocol =          0, /* IPPROTO_IPV[46] */
 140         .pr_flags =             PR_ATOMIC|PR_ADDR,
 141         .pr_input =             in_gif_input,
 142         .pr_usrreqs =           &rip_usrreqs,
 143         .pr_unlock =            rip_unlock,
 144 };
 145 #endif
 146 #if INET6
 147 static struct ip6protosw in6_gif_protosw =
 148 {
 149         .pr_type =              SOCK_RAW,
 150         .pr_protocol =          0, /* IPPROTO_IPV[46] */
 151         .pr_flags =             PR_ATOMIC|PR_ADDR,
 152         .pr_input =             in6_gif_input,
 153         .pr_usrreqs =           &rip6_usrreqs,
 154         .pr_unlock =            rip_unlock,
 155 };
 156 #endif
 157
 158 static if_clone_t gif_cloner = NULL;
 159 static int gif_clone_create(struct if_clone *, uint32_t, void *);
 160 static int gif_clone_destroy(struct ifnet *);
 161 static void gif_delete_tunnel(struct gif_softc *);
 162 static void gif_detach(struct ifnet *);
 163
 164 /*
 165  * Theory of operation: initially, one gif interface is created.
 166  * Any time a gif interface is configured, if there are no other
 167  * unconfigured gif interfaces, a new gif interface is created.
 168  * BSD uses the clone mechanism to dynamically create more
 169  * gif interfaces.
 170  *
 171  * We have some extra glue to support DLIL.
 172  */
 173
 174 /* GIF interface module support */
 175 static int
 176 gif_demux(
 177         ifnet_t ifp,
 178         __unused mbuf_t m,
 179         __unused char *frame_header,
 180         protocol_family_t *protocol_family)
 181 {
 182         struct gif_softc *sc = ifnet_softc(ifp);
 183
 184         GIF_LOCK(sc);
 185         /* Only one protocol may be attached to a gif interface. */
 186         *protocol_family = sc->gif_proto;
 187         GIF_UNLOCK(sc);
 188
 189         return (0);
 190 }
 191
 192 static errno_t
 193 gif_add_proto(
 194         ifnet_t ifp,
 195         protocol_family_t protocol_family,
 196         __unused const struct ifnet_demux_desc *demux_array,
 197         __unused u_int32_t demux_count)
 198 {
 199         /* Only one protocol may be attached at a time */
 200         struct gif_softc *sc = ifnet_softc(ifp);
 201
 202         GIF_LOCK(sc);
 203         if (sc->gif_proto != 0)
 204                 printf("gif_add_proto: request add_proto for gif%d\n",
 205                     ifnet_unit(ifp));
 206
 207         sc->gif_proto = protocol_family;
 208         GIF_UNLOCK(sc);
 209
 210         return (0);
 211 }
 212
 213 static errno_t
 214 gif_del_proto(
 215         ifnet_t ifp,
 216         protocol_family_t protocol_family)
 217 {
 218         struct gif_softc *sc = ifnet_softc(ifp);
 219
 220         GIF_LOCK(sc);
 221         if (sc->gif_proto == protocol_family)
 222                 sc->gif_proto = 0;
 223         GIF_UNLOCK(sc);
 224
 225         return (0);
 226 }
 227
 228 /* Glue code to attach inet to a gif interface through DLIL */
 229 static errno_t
 230 gif_attach_proto_family(
 231         ifnet_t ifp,
 232         protocol_family_t protocol_family)
 233 {
 234         struct ifnet_attach_proto_param reg;
 235         errno_t stat;
 236
 237         bzero(&reg, sizeof (reg));
 238         reg.input = gif_input;
 239
 240         stat = ifnet_attach_protocol(ifp, protocol_family, &reg);
 241         if (stat && stat != EEXIST) {
 242                 printf("gif_attach_proto_family can't attach interface  \
 243                     fam=%d\n", protocol_family);
 244         }
 245
 246         return (stat);
 247 }
 248
 249 /* Function to setup the first gif interface */
 250 void
 251 gif_init(void)
 252 {
 253         errno_t result;
 254         struct ifnet_clone_params ifnet_clone_params;
 255         struct if_clone *ifc = NULL;
 256
 257         /* Initialize the list of interfaces */
 258         TAILQ_INIT(&gifs);
 259
 260         /* Initialize the gif global lock */
 261         gif_mtx_grp_attr = lck_grp_attr_alloc_init();
 262         gif_mtx_grp = lck_grp_alloc_init("gif", gif_mtx_grp_attr);
 263         gif_mtx_attr = lck_attr_alloc_init();
 264         lck_mtx_init(gif_mtx, gif_mtx_grp, gif_mtx_attr);
 265
 266         /* Register protocol registration functions */
 267         result = proto_register_plumber(PF_INET, APPLE_IF_FAM_GIF,
 268             gif_attach_proto_family, NULL);
 269         if (result != 0)
 270                 printf("proto_register_plumber failed for AF_INET error=%d\n",
 271                     result);
 272
 273         result = proto_register_plumber(PF_INET6, APPLE_IF_FAM_GIF,
 274             gif_attach_proto_family, NULL);
 275         if (result != 0)
 276                 printf("proto_register_plumber failed for AF_INET6 error=%d\n",
 277                     result);
 278
 279         ifnet_clone_params.ifc_name = "gif";
 280         ifnet_clone_params.ifc_create = gif_clone_create;
 281         ifnet_clone_params.ifc_destroy = gif_clone_destroy;
 282
 283         result = ifnet_clone_attach(&ifnet_clone_params, &gif_cloner);
 284         if (result != 0)
 285                 printf("gifattach: ifnet_clone_attach failed %d\n", result);
 286
 287         /* Create first device */
 288         ifc = if_clone_lookup("gif", NULL);
 289         gif_clone_create(ifc, 0, NULL);
 290 }
 291
 292 static errno_t
 293 gif_set_bpf_tap(
 294         ifnet_t ifp,
 295         bpf_tap_mode mode,
 296         bpf_packet_func callback)
 297 {
 298         struct gif_softc *sc = ifnet_softc(ifp);
 299
 300         GIF_LOCK(sc);
 301         sc->tap_mode = mode;
 302         sc->tap_callback = callback;
 303         GIF_UNLOCK(sc);
 304
 305         return (0);
 306 }
 307
 308 static void
 309 gif_detach(struct ifnet *ifp)
 310 {
 311         struct gif_softc *sc = ifp->if_softc;
 312         lck_mtx_destroy(&sc->gif_lock, gif_mtx_grp);
 313         _FREE(ifp->if_softc, M_DEVBUF);
 314         ifp->if_softc = NULL;
 315         (void) ifnet_release(ifp);
 316 }
 317
 318 static int
 319 gif_clone_create(struct if_clone *ifc, uint32_t unit, __unused void *params)
 320 {
 321         struct gif_softc *sc = NULL;
 322         struct ifnet_init_params gif_init_params;
 323         errno_t error = 0;
 324
 325         lck_mtx_lock(gif_mtx);
 326
 327         /* Can't create more than GIF_MAXUNIT */
 328         if (ngif >= GIF_MAXUNIT) {
 329                 error = ENXIO;
 330                 goto done;
 331         }
 332
 333         sc = _MALLOC(sizeof (struct gif_softc), M_DEVBUF, M_WAITOK);
 334         if (sc == NULL) {
 335                 log(LOG_ERR, "gif_clone_create: failed to allocate gif%d\n",
 336                     unit);
 337                 error = ENOBUFS;
 338                 goto done;
 339         }
 340         bzero(sc, sizeof (struct gif_softc));
 341
 342         /* use the interface name as the unique id for ifp recycle */
 343         snprintf(sc->gif_ifname, sizeof (sc->gif_ifname), "%s%d",
 344             ifc->ifc_name, unit);
 345
 346         lck_mtx_init(&sc->gif_lock, gif_mtx_grp, gif_mtx_attr);
 347
 348         bzero(&gif_init_params, sizeof (gif_init_params));
 349         gif_init_params.uniqueid = sc->gif_ifname;
 350         gif_init_params.uniqueid_len = strlen(sc->gif_ifname);
 351         gif_init_params.name = GIFNAME;
 352         gif_init_params.unit = unit;
 353         gif_init_params.type = IFT_GIF;
 354         gif_init_params.family = IFNET_FAMILY_GIF;
 355         gif_init_params.output = gif_output;
 356         gif_init_params.demux = gif_demux;
 357         gif_init_params.add_proto = gif_add_proto;
 358         gif_init_params.del_proto = gif_del_proto;
 359         gif_init_params.softc = sc;
 360         gif_init_params.ioctl = gif_ioctl;
 361         gif_init_params.set_bpf_tap = gif_set_bpf_tap;
 362         gif_init_params.detach = gif_detach;
 363
 364         error = ifnet_allocate(&gif_init_params, &sc->gif_if);
 365         if (error != 0) {
 366                 printf("gif_clone_create, ifnet_allocate failed - %d\n", error);
 367                 _FREE(sc, M_DEVBUF);
 368                 error = ENOBUFS;
 369                 goto done;
 370         }
 371
 372         sc->encap_cookie4 = sc->encap_cookie6 = NULL;
 373 #if INET
 374         sc->encap_cookie4 = encap_attach_func(AF_INET, -1,
 375                         gif_encapcheck, &in_gif_protosw, sc);
 376         if (sc->encap_cookie4 == NULL) {
 377                 printf("%s: unable to attach encap4\n", if_name(sc->gif_if));
 378                 ifnet_release(sc->gif_if);
 379                 FREE(sc, M_DEVBUF);
 380                 error = ENOBUFS;
 381                 goto done;
 382         }
 383 #endif
 384 #if INET6
 385         sc->encap_cookie6 = encap_attach_func(AF_INET6, -1,
 386             gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc);
 387         if (sc->encap_cookie6 == NULL) {
 388                 if (sc->encap_cookie4) {
 389                         encap_detach(sc->encap_cookie4);
 390                         sc->encap_cookie4 = NULL;
 391                 }
 392                 printf("%s: unable to attach encap6\n", if_name(sc->gif_if));
 393                 ifnet_release(sc->gif_if);
 394                 FREE(sc, M_DEVBUF);
 395                 error = ENOBUFS;
 396                 goto done;
 397         }
 398 #endif
 399         sc->gif_called = 0;
 400         ifnet_set_mtu(sc->gif_if, GIF_MTU);
 401         ifnet_set_flags(sc->gif_if, IFF_POINTOPOINT | IFF_MULTICAST, 0xffff);
 402 #if 0
 403         /* turn off ingress filter */
 404         sc->gif_if.if_flags  |= IFF_LINK2;
 405 #endif
 406         error = ifnet_attach(sc->gif_if, NULL);
 407         if (error != 0) {
 408                 printf("gif_clone_create - ifnet_attach failed - %d\n", error);
 409                 ifnet_release(sc->gif_if);
 410                 if (sc->encap_cookie4) {
 411                         encap_detach(sc->encap_cookie4);
 412                         sc->encap_cookie4 = NULL;
 413                 }
 414                 if (sc->encap_cookie6) {
 415                         encap_detach(sc->encap_cookie6);
 416                         sc->encap_cookie6 = NULL;
 417                 }
 418                 FREE(sc, M_DEVBUF);
 419                 goto done;
 420         }
 421 #if CONFIG_MACF_NET
 422         mac_ifnet_label_init(&sc->gif_if);
 423 #endif
 424         bpfattach(sc->gif_if, DLT_NULL, sizeof (u_int));
 425         TAILQ_INSERT_TAIL(&gifs, sc, gif_link);
 426         ngif++;
 427 done:
 428         lck_mtx_unlock(gif_mtx);
 429
 430         return (error);
 431 }
 432
 433 static int
 434 gif_clone_destroy(struct ifnet *ifp)
 435 {
 436 #if defined(INET) || defined(INET6)
 437         int error = 0;
 438 #endif
 439         struct gif_softc *sc = ifp->if_softc;
 440
 441         lck_mtx_lock(gif_mtx);
 442         TAILQ_REMOVE(&gifs, sc, gif_link);
 443         ngif--;
 444
 445         GIF_LOCK(sc);
 446         gif_delete_tunnel(sc);
 447 #ifdef INET6
 448         if (sc->encap_cookie6 != NULL) {
 449                 error = encap_detach(sc->encap_cookie6);
 450                 KASSERT(error == 0, ("gif_clone_destroy: Unexpected     \
 451                     error detaching encap_cookie6"));
 452         }
 453 #endif
 454 #ifdef INET
 455         if (sc->encap_cookie4 != NULL) {
 456                 error = encap_detach(sc->encap_cookie4);
 457                 KASSERT(error == 0, ("gif_clone_destroy: Unexpected     \
 458                     error detaching encap_cookie4"));
 459         }
 460 #endif
 461         error = ifnet_set_flags(ifp, 0, IFF_UP);
 462         if (error != 0) {
 463                 printf("gif_clone_destroy: ifnet_set_flags failed %d\n", error);
 464         }
 465
 466         error = ifnet_detach(ifp);
 467         if (error != 0)
 468                 panic("gif_clone_destroy: ifnet_detach(%p) failed %d\n", ifp,
 469                     error);
 470
 471         GIF_UNLOCK(sc);
 472         lck_mtx_unlock(gif_mtx);
 473
 474         return (0);
 475 }
 476
 477 static int
 478 gif_encapcheck(
 479         const struct mbuf *m,
 480         int off,
 481         int proto,
 482         void *arg)
 483 {
 484         int error = 0;
 485         struct ip ip;
 486         struct gif_softc *sc;
 487
 488         sc = (struct gif_softc *)arg;
 489         if (sc == NULL)
 490                 return (error);
 491
 492         GIF_LOCK(sc);
 493         if ((ifnet_flags(sc->gif_if) & IFF_UP) == 0)
 494                 goto done;
 495
 496         /* no physical address */
 497         if (!sc->gif_psrc || !sc->gif_pdst)
 498                 goto done;
 499
 500         switch (proto) {
 501 #if INET
 502         case IPPROTO_IPV4:
 503                 break;
 504 #endif
 505 #if INET6
 506         case IPPROTO_IPV6:
 507                 break;
 508 #endif
 509         default:
 510                 goto done;
 511         }
 512
 513         mbuf_copydata((struct mbuf *)(size_t)m, 0, sizeof (ip), &ip);
 514
 515         switch (ip.ip_v) {
 516 #if INET
 517         case 4:
 518                 if (sc->gif_psrc->sa_family != AF_INET ||
 519                     sc->gif_pdst->sa_family != AF_INET)
 520                         goto done;
 521                 error = gif_encapcheck4(m, off, proto, arg);
 522 #endif
 523 #if INET6
 524         case 6:
 525                 if (sc->gif_psrc->sa_family != AF_INET6 ||
 526                     sc->gif_pdst->sa_family != AF_INET6)
 527                         goto done;
 528                 error = gif_encapcheck6(m, off, proto, arg);
 529 #endif
 530         default:
 531                 goto done;
 532         }
 533 done:
 534         GIF_UNLOCK(sc);
 535         return (error);
 536 }
 537
 538 static errno_t
 539 gif_output(
 540         ifnet_t ifp,
 541         mbuf_t m)
 542 {
 543         struct gif_softc *sc = ifnet_softc(ifp);
 544         struct sockaddr *gif_psrc;
 545         struct sockaddr *gif_pdst;
 546         int error = 0;
 547
 548         GIF_LOCK(sc);
 549         gif_psrc = sc->gif_psrc;
 550         gif_pdst = sc->gif_pdst;
 551         GIF_UNLOCK(sc);
 552
 553         /*
 554          * max_gif_nesting check used to live here. It doesn't anymore
 555          * because there is no guaruntee that we won't be called
 556          * concurrently from more than one thread.
 557          */
 558         m->m_flags &= ~(M_BCAST|M_MCAST);
 559         if (!(ifnet_flags(ifp) & IFF_UP) ||
 560             gif_psrc == NULL || gif_pdst == NULL) {
 561                 ifnet_touch_lastchange(ifp);
 562                 m_freem(m);     /* free it here not in dlil_output */
 563                 error = ENETDOWN;
 564                 goto end;
 565         }
 566
 567         bpf_tap_out(ifp, 0, m, &sc->gif_proto, sizeof (sc->gif_proto));
 568
 569         GIF_LOCK(sc);
 570
 571         /* inner AF-specific encapsulation */
 572
 573         /* XXX should we check if our outer source is legal? */
 574
 575         /* dispatch to output logic based on outer AF */
 576         switch (sc->gif_psrc->sa_family) {
 577 #if INET
 578         case AF_INET:
 579                 error = in_gif_output(ifp, sc->gif_proto, m, NULL);
 580                 break;
 581 #endif
 582 #if INET6
 583         case AF_INET6:
 584                 error = in6_gif_output(ifp, sc->gif_proto, m, NULL);
 585                 break;
 586 #endif
 587         default:
 588                 error = ENETDOWN;
 589                 break;
 590         }
 591
 592         GIF_UNLOCK(sc);
 593 end:
 594         if (error) {
 595                 /* the mbuf was freed either by in_gif_output or in here */
 596                 ifnet_stat_increment_out(ifp, 0, 0, 1);
 597         } else {
 598                 ifnet_stat_increment_out(ifp, 1, m->m_pkthdr.len, 0);
 599         }
 600         if (error == 0)
 601                 error = EJUSTRETURN; /* if no error, packet got sent already */
 602         return (error);
 603 }
 604
 605 /*
 606  * gif_input is the input handler for IP and IPv6 attached to gif
 607  */
 608 static errno_t
 609 gif_input(
 610         ifnet_t ifp,
 611         protocol_family_t protocol_family,
 612         mbuf_t m,
 613         __unused char *frame_header)
 614 {
 615         struct gif_softc *sc = ifnet_softc(ifp);
 616
 617         bpf_tap_in(ifp, 0, m, &sc->gif_proto, sizeof (sc->gif_proto));
 618
 619         /*
 620          * Put the packet to the network layer input queue according to the
 621          * specified address family.
 622          * Note: older versions of gif_input directly called network layer
 623          * input functions, e.g. ip6_input, here. We changed the policy to
 624          * prevent too many recursive calls of such input functions, which
 625          * might cause kernel panic. But the change may introduce another
 626          * problem; if the input queue is full, packets are discarded.
 627          * We believed it rarely occurs and changed the policy. If we find
 628          * it occurs more times than we thought, we may change the policy
 629          * again.
 630          */
 631         if (proto_input(protocol_family, m) != 0) {
 632                 ifnet_stat_increment_in(ifp, 0, 0, 1);
 633                 m_freem(m);
 634         } else
 635                 ifnet_stat_increment_in(ifp, 1, m->m_pkthdr.len, 0);
 636
 637         return (0);
 638 }
 639
 640 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
 641 static errno_t
 642 gif_ioctl(
 643         ifnet_t                 ifp,
 644         u_long                  cmd,
 645         void                    *data)
 646 {
 647         struct gif_softc *sc  = ifnet_softc(ifp);
 648         struct ifreq *ifr = (struct ifreq *)data;
 649         int error = 0, size;
 650         struct sockaddr *dst = NULL, *src = NULL;
 651         struct sockaddr *sa;
 652         struct ifnet *ifp2;
 653         struct gif_softc *sc2;
 654
 655         switch (cmd) {
 656         case SIOCSIFADDR:
 657                 break;
 658
 659         case SIOCSIFDSTADDR:
 660                 break;
 661
 662         case SIOCADDMULTI:
 663         case SIOCDELMULTI:
 664                 break;
 665
 666 #ifdef  SIOCSIFMTU /* xxx */
 667         case SIOCGIFMTU:
 668                 break;
 669
 670         case SIOCSIFMTU:
 671                 {
 672                         u_int32_t mtu;
 673                         mtu = ifr->ifr_mtu;
 674                         if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) {
 675                                 return (EINVAL);
 676                         }
 677                         ifnet_set_mtu(ifp, mtu);
 678                 }
 679                 break;
 680 #endif /* SIOCSIFMTU */
 681
 682         case SIOCSIFPHYADDR:
 683 #if INET6
 684         case SIOCSIFPHYADDR_IN6_32:
 685         case SIOCSIFPHYADDR_IN6_64:
 686 #endif /* INET6 */
 687                 switch (cmd) {
 688 #if INET
 689                 case SIOCSIFPHYADDR:
 690                         src = (struct sockaddr *)
 691                                 &(((struct in_aliasreq *)data)->ifra_addr);
 692                         dst = (struct sockaddr *)
 693                                 &(((struct in_aliasreq *)data)->ifra_dstaddr);
 694                         break;
 695 #endif
 696 #if INET6
 697                 case SIOCSIFPHYADDR_IN6_32: {
 698                         struct in6_aliasreq_32 *ifra_32 =
 699                             (struct in6_aliasreq_32 *)data;
 700
 701                         src = (struct sockaddr *)&ifra_32->ifra_addr;
 702                         dst = (struct sockaddr *)&ifra_32->ifra_dstaddr;
 703                         break;
 704                 }
 705
 706                 case SIOCSIFPHYADDR_IN6_64: {
 707                         struct in6_aliasreq_64 *ifra_64 =
 708                             (struct in6_aliasreq_64 *)data;
 709
 710                         src = (struct sockaddr *)&ifra_64->ifra_addr;
 711                         dst = (struct sockaddr *)&ifra_64->ifra_dstaddr;
 712                         break;
 713                 }
 714 #endif
 715                 }
 716
 717                 /* sa_family must be equal */
 718                 if (src->sa_family != dst->sa_family)
 719                         return (EINVAL);
 720
 721                 /* validate sa_len */
 722                 switch (src->sa_family) {
 723 #if INET
 724                 case AF_INET:
 725                         if (src->sa_len != sizeof (struct sockaddr_in))
 726                                 return (EINVAL);
 727                         break;
 728 #endif
 729 #if INET6
 730                 case AF_INET6:
 731                         if (src->sa_len != sizeof (struct sockaddr_in6))
 732                                 return (EINVAL);
 733                         break;
 734 #endif
 735                 default:
 736                         return (EAFNOSUPPORT);
 737                 }
 738                 switch (dst->sa_family) {
 739 #if INET
 740                 case AF_INET:
 741                         if (dst->sa_len != sizeof (struct sockaddr_in))
 742                                 return (EINVAL);
 743                         break;
 744 #endif
 745 #if INET6
 746                 case AF_INET6:
 747                         if (dst->sa_len != sizeof (struct sockaddr_in6))
 748                                 return (EINVAL);
 749                         break;
 750 #endif
 751                 default:
 752                         return (EAFNOSUPPORT);
 753                 }
 754
 755                 /* check sa_family looks sane for the cmd */
 756                 switch (cmd) {
 757                 case SIOCSIFPHYADDR:
 758                         if (src->sa_family == AF_INET)
 759                                 break;
 760                         return (EAFNOSUPPORT);
 761 #if INET6
 762                 case SIOCSIFPHYADDR_IN6_32:
 763                 case SIOCSIFPHYADDR_IN6_64:
 764                         if (src->sa_family == AF_INET6)
 765                                 break;
 766                         return (EAFNOSUPPORT);
 767 #endif /* INET6 */
 768                 }
 769
 770 #define GIF_ORDERED_LOCK(sc, sc2)       \
 771         if (sc < sc2) {                 \
 772                 GIF_LOCK(sc);           \
 773                 GIF_LOCK(sc2);          \
 774         } else {                        \
 775                 GIF_LOCK(sc2);          \
 776                 GIF_LOCK(sc);           \
 777         }
 778
 779 #define GIF_ORDERED_UNLOCK(sc, sc2)     \
 780         if (sc > sc2) {                 \
 781                 GIF_UNLOCK(sc);         \
 782                 GIF_UNLOCK(sc2);        \
 783         } else {                        \
 784                 GIF_UNLOCK(sc2);        \
 785                 GIF_UNLOCK(sc);         \
 786         }
 787
 788                 ifnet_head_lock_shared();
 789                 TAILQ_FOREACH(ifp2, &ifnet_head, if_link) {
 790                         if (strcmp(ifnet_name(ifp2), GIFNAME) != 0)
 791                                 continue;
 792                         sc2 = ifnet_softc(ifp2);
 793                         if (sc2 == sc)
 794                                 continue;
 795                         /* lock sc and sc2 in increasing order of ifnet index */
 796                         GIF_ORDERED_LOCK(sc, sc2);
 797                         if (!sc2->gif_pdst || !sc2->gif_psrc) {
 798                                 GIF_ORDERED_UNLOCK(sc, sc2);
 799                                 continue;
 800                         }
 801                         if (sc2->gif_pdst->sa_family != dst->sa_family ||
 802                             sc2->gif_pdst->sa_len != dst->sa_len ||
 803                             sc2->gif_psrc->sa_family != src->sa_family ||
 804                             sc2->gif_psrc->sa_len != src->sa_len) {
 805                                 GIF_ORDERED_UNLOCK(sc, sc2);
 806                                 continue;
 807                         }
 808 #ifndef XBONEHACK
 809                         /* can't configure same pair of address onto two gifs */
 810                         if (bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
 811                             bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
 812                                 GIF_ORDERED_UNLOCK(sc, sc2);
 813                                 error = EADDRNOTAVAIL;
 814                                 ifnet_head_done();
 815                                 goto bad;
 816                         }
 817 #endif
 818
 819                         /* can't configure multiple multi-dest interfaces */
 820 #define multidest(x) \
 821         (((struct sockaddr_in *)(void *)(x))->sin_addr.s_addr == INADDR_ANY)
 822 #if INET6
 823 #define multidest6(x) \
 824         (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)      \
 825             (void *)(x))->sin6_addr))
 826 #endif
 827                         if (dst->sa_family == AF_INET &&
 828                             multidest(dst) && multidest(sc2->gif_pdst)) {
 829                                 GIF_ORDERED_UNLOCK(sc, sc2);
 830                                 error = EADDRNOTAVAIL;
 831                                 ifnet_head_done();
 832                                 goto bad;
 833                         }
 834 #if INET6
 835                         if (dst->sa_family == AF_INET6 &&
 836                             multidest6(dst) && multidest6(sc2->gif_pdst)) {
 837                                 GIF_ORDERED_UNLOCK(sc, sc2);
 838                                 error = EADDRNOTAVAIL;
 839                                 ifnet_head_done();
 840                                 goto bad;
 841                         }
 842 #endif
 843                         GIF_ORDERED_UNLOCK(sc, sc2);
 844                 }
 845                 ifnet_head_done();
 846
 847                 GIF_LOCK(sc);
 848                 if (sc->gif_psrc)
 849                         FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 850                 sa = (struct sockaddr *)_MALLOC(src->sa_len, M_IFADDR,
 851                     M_WAITOK);
 852                 if (sa == NULL) {
 853                         GIF_UNLOCK(sc);
 854                         return (ENOBUFS);
 855                 }
 856                 bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
 857                 sc->gif_psrc = sa;
 858
 859                 if (sc->gif_pdst)
 860                         FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 861                 sa = (struct sockaddr *)_MALLOC(dst->sa_len, M_IFADDR,
 862                     M_WAITOK);
 863                 if (sa == NULL) {
 864                         GIF_UNLOCK(sc);
 865                         return (ENOBUFS);
 866                 }
 867                 bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
 868                 sc->gif_pdst = sa;
 869                 GIF_UNLOCK(sc);
 870
 871                 ifnet_set_flags(ifp, IFF_RUNNING | IFF_UP, IFF_RUNNING |
 872                     IFF_UP);
 873
 874                 error = 0;
 875                 break;
 876
 877 #ifdef SIOCDIFPHYADDR
 878         case SIOCDIFPHYADDR:
 879                 GIF_LOCK(sc);
 880                 if (sc->gif_psrc) {
 881                         FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 882                         sc->gif_psrc = NULL;
 883                 }
 884                 if (sc->gif_pdst) {
 885                         FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 886                         sc->gif_pdst = NULL;
 887                 }
 888                 GIF_UNLOCK(sc);
 889                 /* change the IFF_{UP, RUNNING} flag as well? */
 890                 break;
 891 #endif
 892
 893         case SIOCGIFPSRCADDR:
 894 #if INET6
 895         case SIOCGIFPSRCADDR_IN6:
 896 #endif /* INET6 */
 897                 GIF_LOCK(sc);
 898                 if (sc->gif_psrc == NULL) {
 899                         GIF_UNLOCK(sc);
 900                         error = EADDRNOTAVAIL;
 901                         goto bad;
 902                 }
 903                 src = sc->gif_psrc;
 904                 switch (cmd) {
 905 #if INET
 906                 case SIOCGIFPSRCADDR:
 907                         dst = &ifr->ifr_addr;
 908                         size = sizeof (ifr->ifr_addr);
 909                         break;
 910 #endif /* INET */
 911 #if INET6
 912                 case SIOCGIFPSRCADDR_IN6:
 913                         dst = (struct sockaddr *)
 914                                 &(((struct in6_ifreq *)data)->ifr_addr);
 915                         size = sizeof (((struct in6_ifreq *)data)->ifr_addr);
 916                         break;
 917 #endif /* INET6 */
 918                 default:
 919                         GIF_UNLOCK(sc);
 920                         error = EADDRNOTAVAIL;
 921                         goto bad;
 922                 }
 923                 if (src->sa_len > size) {
 924                         GIF_UNLOCK(sc);
 925                         return (EINVAL);
 926                 }
 927                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 928                 GIF_UNLOCK(sc);
 929                 break;
 930
 931         case SIOCGIFPDSTADDR:
 932 #if INET6
 933         case SIOCGIFPDSTADDR_IN6:
 934 #endif /* INET6 */
 935                 GIF_LOCK(sc);
 936                 if (sc->gif_pdst == NULL) {
 937                         GIF_UNLOCK(sc);
 938                         error = EADDRNOTAVAIL;
 939                         goto bad;
 940                 }
 941                 src = sc->gif_pdst;
 942                 switch (cmd) {
 943 #if INET
 944                 case SIOCGIFPDSTADDR:
 945                         dst = &ifr->ifr_addr;
 946                         size = sizeof (ifr->ifr_addr);
 947                         break;
 948 #endif /* INET */
 949 #if INET6
 950                 case SIOCGIFPDSTADDR_IN6:
 951                         dst = (struct sockaddr *)
 952                                 &(((struct in6_ifreq *)data)->ifr_addr);
 953                         size = sizeof (((struct in6_ifreq *)data)->ifr_addr);
 954                         break;
 955 #endif /* INET6 */
 956                 default:
 957                         error = EADDRNOTAVAIL;
 958                         GIF_UNLOCK(sc);
 959                         goto bad;
 960                 }
 961                 if (src->sa_len > size) {
 962                         GIF_UNLOCK(sc);
 963                         return (EINVAL);
 964                 }
 965                 bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
 966                 GIF_UNLOCK(sc);
 967                 break;
 968
 969         case SIOCSIFFLAGS:
 970                 /* if_ioctl() takes care of it */
 971                 break;
 972
 973         default:
 974                 error = EOPNOTSUPP;
 975                 break;
 976         }
 977 bad:
 978         return (error);
 979 }
 980
 981 static void
 982 gif_delete_tunnel(struct gif_softc *sc)
 983 {
 984         GIF_LOCK_ASSERT(sc);
 985         if (sc->gif_psrc) {
 986                 FREE((caddr_t)sc->gif_psrc, M_IFADDR);
 987                 sc->gif_psrc = NULL;
 988         }
 989         if (sc->gif_pdst) {
 990                 FREE((caddr_t)sc->gif_pdst, M_IFADDR);
 991                 sc->gif_pdst = NULL;
 992         }
 993         ROUTE_RELEASE(&sc->gif_ro);
 994         /* change the IFF_UP flag as well? */
 995 }