if_gif.c revision 1.136
1 /* $NetBSD: if_gif.c,v 1.136 2017/12/09 08:03:06 pgoyette Exp $ */ 2 /* $KAME: if_gif.c,v 1.76 2001/08/20 02:01:02 kjc Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: if_gif.c,v 1.136 2017/12/09 08:03:06 pgoyette Exp $"); 35 36 #ifdef _KERNEL_OPT 37 #include "opt_inet.h" 38 #include "opt_net_mpsafe.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/mbuf.h> 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/errno.h> 48 #include <sys/ioctl.h> 49 #include <sys/time.h> 50 #include <sys/socketvar.h> 51 #include <sys/syslog.h> 52 #include <sys/proc.h> 53 #include <sys/cpu.h> 54 #include <sys/intr.h> 55 #include <sys/kmem.h> 56 #include <sys/sysctl.h> 57 #include <sys/xcall.h> 58 #include <sys/device.h> 59 #include <sys/module.h> 60 #include <sys/mutex.h> 61 #include <sys/pserialize.h> 62 #include <sys/psref.h> 63 64 #include <net/if.h> 65 #include <net/if_types.h> 66 #include <net/netisr.h> 67 #include <net/route.h> 68 #include <net/bpf.h> 69 70 #include <netinet/in.h> 71 #include <netinet/in_systm.h> 72 #include <netinet/ip.h> 73 #ifdef INET 74 #include <netinet/in_var.h> 75 #endif /* INET */ 76 #include <netinet/in_gif.h> 77 78 #ifdef INET6 79 #ifndef INET 80 #include <netinet/in.h> 81 #endif 82 #include <netinet6/in6_var.h> 83 #include <netinet/ip6.h> 84 #include <netinet6/ip6_var.h> 85 #include <netinet6/in6_gif.h> 86 #endif /* INET6 */ 87 88 #include <netinet/ip_encap.h> 89 #include <net/if_gif.h> 90 91 #include <net/net_osdep.h> 92 93 #include "ioconf.h" 94 95 #ifdef NET_MPSAFE 96 #define GIF_MPSAFE 1 97 #endif 98 99 /* 100 * gif global variable definitions 101 */ 102 LIST_HEAD(gif_sclist, gif_softc); 103 static struct { 104 struct gif_sclist list; 105 kmutex_t lock; 106 } gif_softcs __cacheline_aligned; 107 108 pserialize_t gif_psz __read_mostly; 109 struct psref_class *gv_psref_class __read_mostly; 110 111 static void gif_ro_init_pc(void *, void *, struct cpu_info *); 112 static void gif_ro_fini_pc(void *, void *, struct cpu_info *); 113 114 static int gifattach0(struct gif_softc *); 115 static int gif_output(struct ifnet *, struct mbuf *, 116 const struct sockaddr *, const struct rtentry *); 117 static void gif_start(struct ifnet *); 118 static int gif_transmit(struct ifnet *, struct mbuf *); 119 static int gif_transmit_direct(struct gif_variant *, struct mbuf *); 120 static int gif_ioctl(struct ifnet *, u_long, void *); 121 static int gif_set_tunnel(struct ifnet *, struct sockaddr *, 122 struct sockaddr *); 123 static void gif_delete_tunnel(struct ifnet *); 124 125 static int gif_clone_create(struct if_clone *, int); 126 static int gif_clone_destroy(struct ifnet *); 127 static int gif_check_nesting(struct ifnet *, struct mbuf *); 128 129 static int gif_encap_attach(struct gif_variant *); 130 static int gif_encap_detach(struct gif_variant *); 131 132 static void gif_update_variant(struct gif_softc *, struct gif_variant *); 133 134 static struct if_clone gif_cloner = 135 IF_CLONE_INITIALIZER("gif", gif_clone_create, gif_clone_destroy); 136 137 #ifndef MAX_GIF_NEST 138 /* 139 * This macro controls the upper limitation on nesting of gif tunnels. 140 * Since, setting a large value to this macro with a careless configuration 141 * may introduce system crash, we don't allow any nestings by default. 142 * If you need to configure nested gif tunnels, you can define this macro 143 * in your kernel configuration file. However, if you do so, please be 144 * careful to configure the tunnels so that it won't make a loop. 145 */ 146 #define MAX_GIF_NEST 1 147 #endif 148 static int max_gif_nesting = MAX_GIF_NEST; 149 150 static struct sysctllog *gif_sysctl; 151 152 static void 153 gif_sysctl_setup(void) 154 { 155 gif_sysctl = NULL; 156 157 #ifdef INET 158 /* 159 * Previously create "net.inet.ip" entry to avoid sysctl_createv error. 160 */ 161 sysctl_createv(NULL, 0, NULL, NULL, 162 CTLFLAG_PERMANENT, 163 CTLTYPE_NODE, "inet", 164 SYSCTL_DESCR("PF_INET related settings"), 165 NULL, 0, NULL, 0, 166 CTL_NET, PF_INET, CTL_EOL); 167 sysctl_createv(NULL, 0, NULL, NULL, 168 CTLFLAG_PERMANENT, 169 CTLTYPE_NODE, "ip", 170 SYSCTL_DESCR("IPv4 related settings"), 171 NULL, 0, NULL, 0, 172 CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); 173 174 sysctl_createv(&gif_sysctl, 0, NULL, NULL, 175 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 176 CTLTYPE_INT, "gifttl", 177 SYSCTL_DESCR("Default TTL for a gif tunnel datagram"), 178 NULL, 0, &ip_gif_ttl, 0, 179 CTL_NET, PF_INET, IPPROTO_IP, 180 IPCTL_GIF_TTL, CTL_EOL); 181 #endif 182 #ifdef INET6 183 /* 184 * Previously create "net.inet6.ip6" entry to avoid sysctl_createv error. 185 */ 186 sysctl_createv(NULL, 0, NULL, NULL, 187 CTLFLAG_PERMANENT, 188 CTLTYPE_NODE, "inet6", 189 SYSCTL_DESCR("PF_INET6 related settings"), 190 NULL, 0, NULL, 0, 191 CTL_NET, PF_INET6, CTL_EOL); 192 sysctl_createv(NULL, 0, NULL, NULL, 193 CTLFLAG_PERMANENT, 194 CTLTYPE_NODE, "ip6", 195 SYSCTL_DESCR("IPv6 related settings"), 196 NULL, 0, NULL, 0, 197 CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); 198 199 sysctl_createv(&gif_sysctl, 0, NULL, NULL, 200 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 201 CTLTYPE_INT, "gifhlim", 202 SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), 203 NULL, 0, &ip6_gif_hlim, 0, 204 CTL_NET, PF_INET6, IPPROTO_IPV6, 205 IPV6CTL_GIF_HLIM, CTL_EOL); 206 #endif 207 } 208 209 /* ARGSUSED */ 210 void 211 gifattach(int count) 212 { 213 /* 214 * Nothing to do here, initialization is handled by the 215 * module initialization code in gifinit() below). 216 */ 217 } 218 219 static void 220 gifinit(void) 221 { 222 223 mutex_init(&gif_softcs.lock, MUTEX_DEFAULT, IPL_NONE); 224 LIST_INIT(&gif_softcs.list); 225 if_clone_attach(&gif_cloner); 226 227 gif_psz = pserialize_create(); 228 gv_psref_class = psref_class_create("gifvar", IPL_SOFTNET); 229 230 gif_sysctl_setup(); 231 } 232 233 static int 234 gifdetach(void) 235 { 236 int error = 0; 237 238 mutex_enter(&gif_softcs.lock); 239 if (!LIST_EMPTY(&gif_softcs.list)) { 240 mutex_exit(&gif_softcs.lock); 241 error = EBUSY; 242 } 243 244 if (error == 0) { 245 psref_class_destroy(gv_psref_class); 246 pserialize_destroy(gif_psz); 247 248 if_clone_detach(&gif_cloner); 249 sysctl_teardown(&gif_sysctl); 250 } 251 252 return error; 253 } 254 255 static int 256 gif_clone_create(struct if_clone *ifc, int unit) 257 { 258 struct gif_softc *sc; 259 struct gif_variant *var; 260 int rv; 261 262 sc = kmem_zalloc(sizeof(struct gif_softc), KM_SLEEP); 263 264 if_initname(&sc->gif_if, ifc->ifc_name, unit); 265 266 rv = gifattach0(sc); 267 if (rv != 0) { 268 kmem_free(sc, sizeof(struct gif_softc)); 269 return rv; 270 } 271 272 var = kmem_zalloc(sizeof(*var), KM_SLEEP); 273 var->gv_softc = sc; 274 psref_target_init(&var->gv_psref, gv_psref_class); 275 276 sc->gif_var = var; 277 mutex_init(&sc->gif_lock, MUTEX_DEFAULT, IPL_NONE); 278 sc->gif_ro_percpu = percpu_alloc(sizeof(struct gif_ro)); 279 percpu_foreach(sc->gif_ro_percpu, gif_ro_init_pc, NULL); 280 281 mutex_enter(&gif_softcs.lock); 282 LIST_INSERT_HEAD(&gif_softcs.list, sc, gif_list); 283 mutex_exit(&gif_softcs.lock); 284 return 0; 285 } 286 287 static int 288 gifattach0(struct gif_softc *sc) 289 { 290 int rv; 291 292 sc->gif_if.if_addrlen = 0; 293 sc->gif_if.if_mtu = GIF_MTU; 294 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 295 sc->gif_if.if_extflags = IFEF_NO_LINK_STATE_CHANGE; 296 #ifdef GIF_MPSAFE 297 sc->gif_if.if_extflags |= IFEF_MPSAFE; 298 #endif 299 sc->gif_if.if_ioctl = gif_ioctl; 300 sc->gif_if.if_output = gif_output; 301 sc->gif_if.if_start = gif_start; 302 sc->gif_if.if_transmit = gif_transmit; 303 sc->gif_if.if_type = IFT_GIF; 304 sc->gif_if.if_dlt = DLT_NULL; 305 sc->gif_if.if_softc = sc; 306 IFQ_SET_READY(&sc->gif_if.if_snd); 307 rv = if_initialize(&sc->gif_if); 308 if (rv != 0) 309 return rv; 310 311 if_register(&sc->gif_if); 312 if_alloc_sadl(&sc->gif_if); 313 bpf_attach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 314 return 0; 315 } 316 317 static void 318 gif_ro_init_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 319 { 320 struct gif_ro *gro = p; 321 322 mutex_init(&gro->gr_lock, MUTEX_DEFAULT, IPL_NONE); 323 } 324 325 static void 326 gif_ro_fini_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 327 { 328 struct gif_ro *gro = p; 329 330 rtcache_free(&gro->gr_ro); 331 332 mutex_destroy(&gro->gr_lock); 333 } 334 335 void 336 gif_rtcache_free_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 337 { 338 struct gif_ro *gro = p; 339 340 rtcache_free(&gro->gr_ro); 341 } 342 343 static int 344 gif_clone_destroy(struct ifnet *ifp) 345 { 346 struct gif_softc *sc = (void *) ifp; 347 struct gif_variant *var; 348 349 LIST_REMOVE(sc, gif_list); 350 351 gif_delete_tunnel(&sc->gif_if); 352 bpf_detach(ifp); 353 if_detach(ifp); 354 355 percpu_foreach(sc->gif_ro_percpu, gif_ro_fini_pc, NULL); 356 percpu_free(sc->gif_ro_percpu, sizeof(struct gif_ro)); 357 358 mutex_destroy(&sc->gif_lock); 359 360 var = sc->gif_var; 361 kmem_free(var, sizeof(*var)); 362 kmem_free(sc, sizeof(struct gif_softc)); 363 364 return 0; 365 } 366 367 #ifdef GIF_ENCAPCHECK 368 int 369 gif_encapcheck(struct mbuf *m, int off, int proto, void *arg) 370 { 371 struct ip ip; 372 struct gif_softc *sc; 373 struct gif_variant *var; 374 struct psref psref; 375 int ret = 0; 376 377 sc = arg; 378 if (sc == NULL) 379 return 0; 380 381 if ((sc->gif_if.if_flags & IFF_UP) == 0) 382 return 0; 383 384 var = gif_getref_variant(sc, &psref); 385 if (var->gv_psrc == NULL || var->gv_pdst == NULL) 386 goto out; 387 388 /* no physical address */ 389 if (!var->gv_psrc || !var->gv_pdst) 390 goto out; 391 392 switch (proto) { 393 #ifdef INET 394 case IPPROTO_IPV4: 395 break; 396 #endif 397 #ifdef INET6 398 case IPPROTO_IPV6: 399 break; 400 #endif 401 default: 402 goto out; 403 } 404 405 /* Bail on short packets */ 406 KASSERT(m->m_flags & M_PKTHDR); 407 if (m->m_pkthdr.len < sizeof(ip)) 408 goto out; 409 410 m_copydata(m, 0, sizeof(ip), &ip); 411 412 switch (ip.ip_v) { 413 #ifdef INET 414 case 4: 415 if (var->gv_psrc->sa_family != AF_INET || 416 var->gv_pdst->sa_family != AF_INET) 417 goto out; 418 ret = gif_encapcheck4(m, off, proto, var); 419 break; 420 #endif 421 #ifdef INET6 422 case 6: 423 if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) 424 goto out; 425 if (var->gv_psrc->sa_family != AF_INET6 || 426 var->gv_pdst->sa_family != AF_INET6) 427 goto out; 428 ret = gif_encapcheck6(m, off, proto, var); 429 break; 430 #endif 431 default: 432 goto out; 433 } 434 435 out: 436 gif_putref_variant(var, &psref); 437 return ret; 438 } 439 #endif 440 441 /* 442 * gif may cause infinite recursion calls when misconfigured. 443 * We'll prevent this by introducing upper limit. 444 */ 445 static int 446 gif_check_nesting(struct ifnet *ifp, struct mbuf *m) 447 { 448 449 return if_tunnel_check_nesting(ifp, m, max_gif_nesting); 450 } 451 452 static int 453 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 454 const struct rtentry *rt) 455 { 456 struct gif_softc *sc = ifp->if_softc; 457 struct gif_variant *var = NULL; 458 struct psref psref; 459 int error = 0; 460 461 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 462 463 if ((error = gif_check_nesting(ifp, m)) != 0) { 464 m_free(m); 465 goto end; 466 } 467 468 if ((ifp->if_flags & IFF_UP) == 0) { 469 m_freem(m); 470 error = ENETDOWN; 471 goto end; 472 } 473 474 var = gif_getref_variant(sc, &psref); 475 if (var->gv_psrc == NULL || var->gv_pdst == NULL) { 476 m_freem(m); 477 error = ENETDOWN; 478 goto end; 479 } 480 /* XXX should we check if our outer source is legal? */ 481 482 m->m_flags &= ~(M_BCAST|M_MCAST); 483 484 /* use DLT_NULL encapsulation here to pass inner af type */ 485 M_PREPEND(m, sizeof(int), M_DONTWAIT); 486 if (!m) { 487 error = ENOBUFS; 488 goto end; 489 } 490 *mtod(m, int *) = dst->sa_family; 491 492 /* Clear checksum-offload flags. */ 493 m->m_pkthdr.csum_flags = 0; 494 m->m_pkthdr.csum_data = 0; 495 496 error = gif_transmit_direct(var, m); 497 end: 498 if (var != NULL) 499 gif_putref_variant(var, &psref); 500 if (error) 501 ifp->if_oerrors++; 502 return error; 503 } 504 505 static void 506 gif_start(struct ifnet *ifp) 507 { 508 struct gif_softc *sc; 509 struct gif_variant *var; 510 struct mbuf *m; 511 struct psref psref; 512 int family; 513 int len; 514 int error; 515 516 sc = ifp->if_softc; 517 var = gif_getref_variant(sc, &psref); 518 519 KASSERT(var->gv_output != NULL); 520 521 /* output processing */ 522 while (1) { 523 IFQ_DEQUEUE(&sc->gif_if.if_snd, m); 524 if (m == NULL) 525 break; 526 527 /* grab and chop off inner af type */ 528 if (sizeof(int) > m->m_len) { 529 m = m_pullup(m, sizeof(int)); 530 if (!m) { 531 ifp->if_oerrors++; 532 continue; 533 } 534 } 535 family = *mtod(m, int *); 536 bpf_mtap(ifp, m); 537 m_adj(m, sizeof(int)); 538 539 len = m->m_pkthdr.len; 540 541 error = var->gv_output(var, family, m); 542 if (error) 543 ifp->if_oerrors++; 544 else { 545 ifp->if_opackets++; 546 ifp->if_obytes += len; 547 } 548 } 549 550 gif_putref_variant(var, &psref); 551 } 552 553 static int 554 gif_transmit(struct ifnet *ifp, struct mbuf *m) 555 { 556 struct gif_softc *sc; 557 struct gif_variant *var; 558 struct psref psref; 559 int error; 560 561 sc = ifp->if_softc; 562 563 /* output processing */ 564 if (m == NULL) 565 return EINVAL; 566 567 var = gif_getref_variant(sc, &psref); 568 error = gif_transmit_direct(var, m); 569 gif_putref_variant(var, &psref); 570 571 return error; 572 } 573 574 static int 575 gif_transmit_direct(struct gif_variant *var, struct mbuf *m) 576 { 577 struct ifnet *ifp = &var->gv_softc->gif_if; 578 int error; 579 int family; 580 int len; 581 582 KASSERT(gif_heldref_variant(var)); 583 KASSERT(var->gv_output != NULL); 584 585 /* grab and chop off inner af type */ 586 if (sizeof(int) > m->m_len) { 587 m = m_pullup(m, sizeof(int)); 588 if (!m) { 589 ifp->if_oerrors++; 590 return ENOBUFS; 591 } 592 } 593 family = *mtod(m, int *); 594 bpf_mtap(ifp, m); 595 m_adj(m, sizeof(int)); 596 597 len = m->m_pkthdr.len; 598 599 error = var->gv_output(var, family, m); 600 if (error) 601 ifp->if_oerrors++; 602 else { 603 ifp->if_opackets++; 604 ifp->if_obytes += len; 605 } 606 607 return error; 608 } 609 610 void 611 gif_input(struct mbuf *m, int af, struct ifnet *ifp) 612 { 613 pktqueue_t *pktq; 614 size_t pktlen; 615 616 if (ifp == NULL) { 617 /* just in case */ 618 m_freem(m); 619 return; 620 } 621 622 m_set_rcvif(m, ifp); 623 pktlen = m->m_pkthdr.len; 624 625 bpf_mtap_af(ifp, af, m); 626 627 /* 628 * Put the packet to the network layer input queue according to the 629 * specified address family. Note: we avoid direct call to the 630 * input function of the network layer in order to avoid recursion. 631 * This may be revisited in the future. 632 */ 633 switch (af) { 634 #ifdef INET 635 case AF_INET: 636 pktq = ip_pktq; 637 break; 638 #endif 639 #ifdef INET6 640 case AF_INET6: 641 pktq = ip6_pktq; 642 break; 643 #endif 644 default: 645 m_freem(m); 646 return; 647 } 648 649 #ifdef GIF_MPSAFE 650 const u_int h = curcpu()->ci_index; 651 #else 652 const uint32_t h = pktq_rps_hash(m); 653 #endif 654 if (__predict_true(pktq_enqueue(pktq, m, h))) { 655 ifp->if_ibytes += pktlen; 656 ifp->if_ipackets++; 657 } else { 658 m_freem(m); 659 } 660 } 661 662 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 663 static int 664 gif_ioctl(struct ifnet *ifp, u_long cmd, void *data) 665 { 666 struct gif_softc *sc = ifp->if_softc; 667 struct ifreq *ifr = (struct ifreq*)data; 668 struct ifaddr *ifa = (struct ifaddr*)data; 669 int error = 0, size, bound; 670 struct sockaddr *dst, *src; 671 struct gif_variant *var; 672 struct psref psref; 673 674 switch (cmd) { 675 case SIOCINITIFADDR: 676 ifp->if_flags |= IFF_UP; 677 ifa->ifa_rtrequest = p2p_rtrequest; 678 break; 679 680 case SIOCADDMULTI: 681 case SIOCDELMULTI: 682 switch (ifr->ifr_addr.sa_family) { 683 #ifdef INET 684 case AF_INET: /* IP supports Multicast */ 685 break; 686 #endif /* INET */ 687 #ifdef INET6 688 case AF_INET6: /* IP6 supports Multicast */ 689 break; 690 #endif /* INET6 */ 691 default: /* Other protocols doesn't support Multicast */ 692 error = EAFNOSUPPORT; 693 break; 694 } 695 break; 696 697 case SIOCSIFMTU: 698 if (ifr->ifr_mtu < GIF_MTU_MIN || ifr->ifr_mtu > GIF_MTU_MAX) 699 return EINVAL; 700 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 701 error = 0; 702 break; 703 704 #ifdef INET 705 case SIOCSIFPHYADDR: 706 #endif 707 #ifdef INET6 708 case SIOCSIFPHYADDR_IN6: 709 #endif /* INET6 */ 710 case SIOCSLIFPHYADDR: 711 switch (cmd) { 712 #ifdef INET 713 case SIOCSIFPHYADDR: 714 src = (struct sockaddr *) 715 &(((struct in_aliasreq *)data)->ifra_addr); 716 dst = (struct sockaddr *) 717 &(((struct in_aliasreq *)data)->ifra_dstaddr); 718 break; 719 #endif 720 #ifdef INET6 721 case SIOCSIFPHYADDR_IN6: 722 src = (struct sockaddr *) 723 &(((struct in6_aliasreq *)data)->ifra_addr); 724 dst = (struct sockaddr *) 725 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 726 break; 727 #endif 728 case SIOCSLIFPHYADDR: 729 src = (struct sockaddr *) 730 &(((struct if_laddrreq *)data)->addr); 731 dst = (struct sockaddr *) 732 &(((struct if_laddrreq *)data)->dstaddr); 733 break; 734 default: 735 return EINVAL; 736 } 737 738 /* sa_family must be equal */ 739 if (src->sa_family != dst->sa_family) 740 return EINVAL; 741 742 /* validate sa_len */ 743 switch (src->sa_family) { 744 #ifdef INET 745 case AF_INET: 746 if (src->sa_len != sizeof(struct sockaddr_in)) 747 return EINVAL; 748 break; 749 #endif 750 #ifdef INET6 751 case AF_INET6: 752 if (src->sa_len != sizeof(struct sockaddr_in6)) 753 return EINVAL; 754 break; 755 #endif 756 default: 757 return EAFNOSUPPORT; 758 } 759 switch (dst->sa_family) { 760 #ifdef INET 761 case AF_INET: 762 if (dst->sa_len != sizeof(struct sockaddr_in)) 763 return EINVAL; 764 break; 765 #endif 766 #ifdef INET6 767 case AF_INET6: 768 if (dst->sa_len != sizeof(struct sockaddr_in6)) 769 return EINVAL; 770 break; 771 #endif 772 default: 773 return EAFNOSUPPORT; 774 } 775 776 /* check sa_family looks sane for the cmd */ 777 switch (cmd) { 778 case SIOCSIFPHYADDR: 779 if (src->sa_family == AF_INET) 780 break; 781 return EAFNOSUPPORT; 782 #ifdef INET6 783 case SIOCSIFPHYADDR_IN6: 784 if (src->sa_family == AF_INET6) 785 break; 786 return EAFNOSUPPORT; 787 #endif /* INET6 */ 788 case SIOCSLIFPHYADDR: 789 /* checks done in the above */ 790 break; 791 } 792 /* 793 * calls gif_getref_variant() for other softcs to check 794 * address pair duplicattion 795 */ 796 bound = curlwp_bind(); 797 error = gif_set_tunnel(&sc->gif_if, src, dst); 798 curlwp_bindx(bound); 799 break; 800 801 #ifdef SIOCDIFPHYADDR 802 case SIOCDIFPHYADDR: 803 bound = curlwp_bind(); 804 gif_delete_tunnel(&sc->gif_if); 805 curlwp_bindx(bound); 806 break; 807 #endif 808 809 case SIOCGIFPSRCADDR: 810 #ifdef INET6 811 case SIOCGIFPSRCADDR_IN6: 812 #endif /* INET6 */ 813 bound = curlwp_bind(); 814 var = gif_getref_variant(sc, &psref); 815 if (var->gv_psrc == NULL) { 816 gif_putref_variant(var, &psref); 817 curlwp_bindx(bound); 818 error = EADDRNOTAVAIL; 819 goto bad; 820 } 821 src = var->gv_psrc; 822 switch (cmd) { 823 #ifdef INET 824 case SIOCGIFPSRCADDR: 825 dst = &ifr->ifr_addr; 826 size = sizeof(ifr->ifr_addr); 827 break; 828 #endif /* INET */ 829 #ifdef INET6 830 case SIOCGIFPSRCADDR_IN6: 831 dst = (struct sockaddr *) 832 &(((struct in6_ifreq *)data)->ifr_addr); 833 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 834 break; 835 #endif /* INET6 */ 836 default: 837 gif_putref_variant(var, &psref); 838 curlwp_bindx(bound); 839 error = EADDRNOTAVAIL; 840 goto bad; 841 } 842 if (src->sa_len > size) { 843 gif_putref_variant(var, &psref); 844 curlwp_bindx(bound); 845 return EINVAL; 846 } 847 memcpy(dst, src, src->sa_len); 848 gif_putref_variant(var, &psref); 849 curlwp_bindx(bound); 850 break; 851 852 case SIOCGIFPDSTADDR: 853 #ifdef INET6 854 case SIOCGIFPDSTADDR_IN6: 855 #endif /* INET6 */ 856 bound = curlwp_bind(); 857 var = gif_getref_variant(sc, &psref); 858 if (var->gv_pdst == NULL) { 859 gif_putref_variant(var, &psref); 860 curlwp_bindx(bound); 861 error = EADDRNOTAVAIL; 862 goto bad; 863 } 864 src = var->gv_pdst; 865 switch (cmd) { 866 #ifdef INET 867 case SIOCGIFPDSTADDR: 868 dst = &ifr->ifr_addr; 869 size = sizeof(ifr->ifr_addr); 870 break; 871 #endif /* INET */ 872 #ifdef INET6 873 case SIOCGIFPDSTADDR_IN6: 874 dst = (struct sockaddr *) 875 &(((struct in6_ifreq *)data)->ifr_addr); 876 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 877 break; 878 #endif /* INET6 */ 879 default: 880 gif_putref_variant(var, &psref); 881 curlwp_bindx(bound); 882 error = EADDRNOTAVAIL; 883 goto bad; 884 } 885 if (src->sa_len > size) { 886 gif_putref_variant(var, &psref); 887 curlwp_bindx(bound); 888 return EINVAL; 889 } 890 memcpy(dst, src, src->sa_len); 891 gif_putref_variant(var, &psref); 892 curlwp_bindx(bound); 893 break; 894 895 case SIOCGLIFPHYADDR: 896 bound = curlwp_bind(); 897 var = gif_getref_variant(sc, &psref); 898 if (var->gv_psrc == NULL || var->gv_pdst == NULL) { 899 gif_putref_variant(var, &psref); 900 curlwp_bindx(bound); 901 error = EADDRNOTAVAIL; 902 goto bad; 903 } 904 905 /* copy src */ 906 src = var->gv_psrc; 907 dst = (struct sockaddr *) 908 &(((struct if_laddrreq *)data)->addr); 909 size = sizeof(((struct if_laddrreq *)data)->addr); 910 if (src->sa_len > size) { 911 gif_putref_variant(var, &psref); 912 curlwp_bindx(bound); 913 return EINVAL; 914 } 915 memcpy(dst, src, src->sa_len); 916 917 /* copy dst */ 918 src = var->gv_pdst; 919 dst = (struct sockaddr *) 920 &(((struct if_laddrreq *)data)->dstaddr); 921 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 922 if (src->sa_len > size) { 923 gif_putref_variant(var, &psref); 924 curlwp_bindx(bound); 925 return EINVAL; 926 } 927 memcpy(dst, src, src->sa_len); 928 gif_putref_variant(var, &psref); 929 curlwp_bindx(bound); 930 break; 931 932 default: 933 return ifioctl_common(ifp, cmd, data); 934 } 935 bad: 936 return error; 937 } 938 939 static int 940 gif_encap_attach(struct gif_variant *var) 941 { 942 int error; 943 944 if (var == NULL || var->gv_psrc == NULL) 945 return EINVAL; 946 947 switch (var->gv_psrc->sa_family) { 948 #ifdef INET 949 case AF_INET: 950 error = in_gif_attach(var); 951 break; 952 #endif 953 #ifdef INET6 954 case AF_INET6: 955 error = in6_gif_attach(var); 956 break; 957 #endif 958 default: 959 error = EINVAL; 960 break; 961 } 962 963 return error; 964 } 965 966 static int 967 gif_encap_detach(struct gif_variant *var) 968 { 969 int error; 970 971 if (var == NULL || var->gv_psrc == NULL) 972 return EINVAL; 973 974 switch (var->gv_psrc->sa_family) { 975 #ifdef INET 976 case AF_INET: 977 error = in_gif_detach(var); 978 break; 979 #endif 980 #ifdef INET6 981 case AF_INET6: 982 error = in6_gif_detach(var); 983 break; 984 #endif 985 default: 986 error = EINVAL; 987 break; 988 } 989 990 return error; 991 } 992 993 static int 994 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 995 { 996 struct gif_softc *sc = ifp->if_softc; 997 struct gif_softc *sc2; 998 struct gif_variant *ovar, *nvar; 999 struct sockaddr *osrc, *odst; 1000 struct sockaddr *nsrc, *ndst; 1001 int error; 1002 #ifndef GIF_MPSAFE 1003 int s; 1004 1005 s = splsoftnet(); 1006 #endif 1007 error = encap_lock_enter(); 1008 if (error) { 1009 #ifndef GIF_MPSAFE 1010 splx(s); 1011 #endif 1012 return error; 1013 } 1014 1015 nsrc = sockaddr_dup(src, M_WAITOK); 1016 ndst = sockaddr_dup(dst, M_WAITOK); 1017 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1018 1019 mutex_enter(&sc->gif_lock); 1020 1021 ovar = sc->gif_var; 1022 1023 if ((ovar->gv_pdst && sockaddr_cmp(ovar->gv_pdst, dst) == 0) && 1024 (ovar->gv_psrc && sockaddr_cmp(ovar->gv_psrc, src) == 0)) { 1025 /* address and port pair not changed. */ 1026 error = 0; 1027 goto out; 1028 } 1029 1030 mutex_enter(&gif_softcs.lock); 1031 LIST_FOREACH(sc2, &gif_softcs.list, gif_list) { 1032 struct gif_variant *var2; 1033 struct psref psref; 1034 1035 if (sc2 == sc) 1036 continue; 1037 var2 = gif_getref_variant(sc, &psref); 1038 if (!var2->gv_pdst || !var2->gv_psrc) { 1039 gif_putref_variant(var2, &psref); 1040 continue; 1041 } 1042 /* can't configure same pair of address onto two gifs */ 1043 if (sockaddr_cmp(var2->gv_pdst, dst) == 0 && 1044 sockaddr_cmp(var2->gv_psrc, src) == 0) { 1045 /* continue to use the old configureation. */ 1046 gif_putref_variant(var2, &psref); 1047 mutex_exit(&gif_softcs.lock); 1048 error = EADDRNOTAVAIL; 1049 goto out; 1050 } 1051 gif_putref_variant(var2, &psref); 1052 /* XXX both end must be valid? (I mean, not 0.0.0.0) */ 1053 } 1054 mutex_exit(&gif_softcs.lock); 1055 1056 osrc = ovar->gv_psrc; 1057 odst = ovar->gv_pdst; 1058 1059 *nvar = *ovar; 1060 nvar->gv_psrc = nsrc; 1061 nvar->gv_pdst = ndst; 1062 nvar->gv_encap_cookie4 = NULL; 1063 nvar->gv_encap_cookie6 = NULL; 1064 error = gif_encap_attach(nvar); 1065 if (error) 1066 goto out; 1067 psref_target_init(&nvar->gv_psref, gv_psref_class); 1068 membar_producer(); 1069 gif_update_variant(sc, nvar); 1070 1071 mutex_exit(&sc->gif_lock); 1072 1073 (void)gif_encap_detach(ovar); 1074 encap_lock_exit(); 1075 1076 if (osrc) 1077 sockaddr_free(osrc); 1078 if (odst) 1079 sockaddr_free(odst); 1080 kmem_free(ovar, sizeof(*ovar)); 1081 1082 #ifndef GIF_MPSAFE 1083 splx(s); 1084 #endif 1085 return 0; 1086 1087 out: 1088 sockaddr_free(nsrc); 1089 sockaddr_free(ndst); 1090 kmem_free(nvar, sizeof(*nvar)); 1091 1092 mutex_exit(&sc->gif_lock); 1093 encap_lock_exit(); 1094 #ifndef GIF_MPSAFE 1095 splx(s); 1096 #endif 1097 return error; 1098 } 1099 1100 static void 1101 gif_delete_tunnel(struct ifnet *ifp) 1102 { 1103 struct gif_softc *sc = ifp->if_softc; 1104 struct gif_variant *ovar, *nvar; 1105 struct sockaddr *osrc, *odst; 1106 int error; 1107 #ifndef GIF_MPSAFE 1108 int s; 1109 1110 s = splsoftnet(); 1111 #endif 1112 error = encap_lock_enter(); 1113 if (error) { 1114 #ifndef GIF_MPSAFE 1115 splx(s); 1116 #endif 1117 return; 1118 } 1119 1120 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1121 1122 mutex_enter(&sc->gif_lock); 1123 1124 ovar = sc->gif_var; 1125 osrc = ovar->gv_psrc; 1126 odst = ovar->gv_pdst; 1127 if (osrc == NULL || odst == NULL) { 1128 /* address pair not changed. */ 1129 mutex_exit(&sc->gif_lock); 1130 encap_lock_exit(); 1131 kmem_free(nvar, sizeof(*nvar)); 1132 return; 1133 } 1134 1135 *nvar = *ovar; 1136 nvar->gv_psrc = NULL; 1137 nvar->gv_pdst = NULL; 1138 nvar->gv_encap_cookie4 = NULL; 1139 nvar->gv_encap_cookie6 = NULL; 1140 nvar->gv_output = NULL; 1141 psref_target_init(&nvar->gv_psref, gv_psref_class); 1142 membar_producer(); 1143 gif_update_variant(sc, nvar); 1144 1145 mutex_exit(&sc->gif_lock); 1146 1147 gif_encap_detach(ovar); 1148 encap_lock_exit(); 1149 1150 sockaddr_free(osrc); 1151 sockaddr_free(odst); 1152 kmem_free(ovar, sizeof(*ovar)); 1153 1154 #ifndef GIF_MPSAFE 1155 splx(s); 1156 #endif 1157 } 1158 1159 /* 1160 * gif_variant update API. 1161 * 1162 * Assumption: 1163 * reader side dereferences sc->gif_var in reader critical section only, 1164 * that is, all of reader sides do not reader the sc->gif_var after 1165 * pserialize_perform(). 1166 */ 1167 static void 1168 gif_update_variant(struct gif_softc *sc, struct gif_variant *nvar) 1169 { 1170 struct ifnet *ifp = &sc->gif_if; 1171 struct gif_variant *ovar = sc->gif_var; 1172 1173 KASSERT(mutex_owned(&sc->gif_lock)); 1174 1175 sc->gif_var = nvar; 1176 pserialize_perform(gif_psz); 1177 psref_target_destroy(&ovar->gv_psref, gv_psref_class); 1178 1179 if (nvar->gv_psrc != NULL && nvar->gv_pdst != NULL) 1180 ifp->if_flags |= IFF_RUNNING; 1181 else 1182 ifp->if_flags &= ~IFF_RUNNING; 1183 } 1184 1185 /* 1186 * Module infrastructure 1187 */ 1188 #include "if_module.h" 1189 1190 IF_MODULE(MODULE_CLASS_DRIVER, gif, "ip_ecn") 1191
Indexes created Tue Sep 23 14:10:03 GMT 2025