if_gif.c revision 1.9
1 /* $NetBSD: if_gif.c,v 1.9 2000/04/19 06:30:52 itojun Exp $ */ 2 /* $KAME: if_gif.c,v 1.21 2000/04/19 06:20:11 itojun 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 /* 34 * gif.c 35 */ 36 37 #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) 38 #include "opt_inet.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 45 #include <sys/malloc.h> 46 #endif 47 #include <sys/mbuf.h> 48 #include <sys/socket.h> 49 #include <sys/sockio.h> 50 #include <sys/errno.h> 51 #if defined(__FreeBSD__) || __FreeBSD__ >= 3 52 /*nothing*/ 53 #else 54 #include <sys/ioctl.h> 55 #endif 56 #include <sys/time.h> 57 #include <sys/syslog.h> 58 #include <sys/protosw.h> 59 #include <machine/cpu.h> 60 61 #include <net/if.h> 62 #include <net/if_types.h> 63 #include <net/netisr.h> 64 #include <net/route.h> 65 #include <net/bpf.h> 66 67 #ifdef INET 68 #include <netinet/in.h> 69 #include <netinet/in_systm.h> 70 #include <netinet/in_var.h> 71 #include <netinet/ip.h> 72 #include <netinet/in_gif.h> 73 #endif /* INET */ 74 75 #ifdef INET6 76 #ifndef INET 77 #include <netinet/in.h> 78 #endif 79 #include <netinet6/in6_var.h> 80 #include <netinet/ip6.h> 81 #include <netinet6/ip6_var.h> 82 #include <netinet6/in6_gif.h> 83 #include <netinet6/ip6protosw.h> 84 #endif /* INET6 */ 85 86 #include <netinet/ip_encap.h> 87 #include <net/if_gif.h> 88 89 #include "gif.h" 90 #include "bpfilter.h" 91 92 #include <net/net_osdep.h> 93 94 #if NGIF > 0 95 96 #ifdef __FreeBSD__ 97 void gifattach __P((void *)); 98 #else 99 void gifattach __P((int)); 100 #endif 101 static int gif_encapcheck __P((const struct mbuf *, int, int, void *)); 102 #ifdef INET 103 extern struct protosw in_gif_protosw; 104 #endif 105 #ifdef INET6 106 extern struct ip6protosw in6_gif_protosw; 107 #endif 108 109 /* 110 * gif global variable definitions 111 */ 112 static int ngif; /* number of interfaces */ 113 static struct gif_softc *gif = 0; 114 115 #ifndef MAX_GIF_NEST 116 /* 117 * This macro controls the upper limitation on nesting of gif tunnels. 118 * Since, setting a large value to this macro with a careless configuration 119 * may introduce system crash, we don't allow any nestings by default. 120 * If you need to configure nested gif tunnels, you can define this macro 121 * in your kernel configuration file. However, if you do so, please be 122 * careful to configure the tunnels so that it won't make a loop. 123 */ 124 #define MAX_GIF_NEST 1 125 #endif 126 static int max_gif_nesting = MAX_GIF_NEST; 127 128 void 129 gifattach(dummy) 130 #ifdef __FreeBSD__ 131 void *dummy; 132 #else 133 int dummy; 134 #endif 135 { 136 register struct gif_softc *sc; 137 register int i; 138 139 #ifdef __NetBSD__ 140 ngif = dummy; 141 #else 142 ngif = NGIF; 143 #endif 144 gif = sc = malloc (ngif * sizeof(struct gif_softc), M_DEVBUF, M_WAIT); 145 bzero(sc, ngif * sizeof(struct gif_softc)); 146 for (i = 0; i < ngif; sc++, i++) { 147 #if defined(__NetBSD__) || defined(__OpenBSD__) 148 sprintf(sc->gif_if.if_xname, "gif%d", i); 149 #else 150 sc->gif_if.if_name = "gif"; 151 sc->gif_if.if_unit = i; 152 #endif 153 154 sc->encap_cookie4 = sc->encap_cookie6 = NULL; 155 #ifdef INET 156 sc->encap_cookie4 = encap_attach_func(AF_INET, -1, 157 gif_encapcheck, &in_gif_protosw, sc); 158 if (sc->encap_cookie4 == NULL) { 159 printf("%s: attach failed\n", if_name(&sc->gif_if)); 160 continue; 161 } 162 #endif 163 #ifdef INET6 164 sc->encap_cookie6 = encap_attach_func(AF_INET6, -1, 165 gif_encapcheck, (struct protosw *)&in6_gif_protosw, sc); 166 if (sc->encap_cookie6 == NULL) { 167 if (sc->encap_cookie4) { 168 encap_detach(sc->encap_cookie4); 169 sc->encap_cookie4 = NULL; 170 } 171 printf("%s: attach failed\n", if_name(&sc->gif_if)); 172 continue; 173 } 174 #endif 175 176 sc->gif_if.if_mtu = GIF_MTU; 177 sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; 178 sc->gif_if.if_ioctl = gif_ioctl; 179 sc->gif_if.if_output = gif_output; 180 sc->gif_if.if_type = IFT_GIF; 181 if_attach(&sc->gif_if); 182 #if NBPFILTER > 0 183 #ifdef HAVE_OLD_BPF 184 bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int)); 185 #else 186 bpfattach(&sc->gif_if.if_bpf, &sc->gif_if, DLT_NULL, sizeof(u_int)); 187 #endif 188 #endif 189 } 190 } 191 192 #ifdef __FreeBSD__ 193 PSEUDO_SET(gifattach, if_gif); 194 #endif 195 196 static int 197 gif_encapcheck(m, off, proto, arg) 198 const struct mbuf *m; 199 int off; 200 int proto; 201 void *arg; 202 { 203 struct ip ip; 204 struct gif_softc *sc; 205 206 sc = (struct gif_softc *)arg; 207 if (sc == NULL) 208 return 0; 209 210 if ((sc->gif_if.if_flags & IFF_UP) == 0) 211 return 0; 212 213 /* no physical address */ 214 if (!sc->gif_psrc || !sc->gif_pdst) 215 return 0; 216 217 switch (proto) { 218 #ifdef INET 219 case IPPROTO_IPV4: 220 break; 221 #endif 222 #ifdef INET6 223 case IPPROTO_IPV6: 224 break; 225 #endif 226 default: 227 return 0; 228 } 229 230 /* LINTED const cast */ 231 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip); 232 233 switch (ip.ip_v) { 234 #ifdef INET 235 case 4: 236 if (sc->gif_psrc->sa_family != AF_INET || 237 sc->gif_pdst->sa_family != AF_INET) 238 return 0; 239 return gif_encapcheck4(m, off, proto, arg); 240 #endif 241 #ifdef INET6 242 case 6: 243 if (sc->gif_psrc->sa_family != AF_INET6 || 244 sc->gif_pdst->sa_family != AF_INET6) 245 return 0; 246 return gif_encapcheck6(m, off, proto, arg); 247 #endif 248 default: 249 return 0; 250 } 251 } 252 253 int 254 gif_output(ifp, m, dst, rt) 255 struct ifnet *ifp; 256 struct mbuf *m; 257 struct sockaddr *dst; 258 struct rtentry *rt; /* added in net2 */ 259 { 260 register struct gif_softc *sc = (struct gif_softc*)ifp; 261 int error = 0; 262 static int called = 0; /* XXX: MUTEX */ 263 264 /* 265 * gif may cause infinite recursion calls when misconfigured. 266 * We'll prevent this by introducing upper limit. 267 * XXX: this mechanism may introduce another problem about 268 * mutual exclusion of the variable CALLED, especially if we 269 * use kernel thread. 270 */ 271 if (++called > max_gif_nesting) { 272 log(LOG_NOTICE, 273 "gif_output: recursively called too many times(%d)\n", 274 called); 275 m_freem(m); 276 error = EIO; /* is there better errno? */ 277 goto end; 278 } 279 280 #if defined(__FreeBSD__) && __FreeBSD__ >= 3 281 getmicrotime(&ifp->if_lastchange); 282 #else 283 ifp->if_lastchange = time; 284 #endif 285 m->m_flags &= ~(M_BCAST|M_MCAST); 286 if (!(ifp->if_flags & IFF_UP) || 287 sc->gif_psrc == NULL || sc->gif_pdst == NULL) { 288 m_freem(m); 289 error = ENETDOWN; 290 goto end; 291 } 292 293 #if NBPFILTER > 0 294 if (ifp->if_bpf) { 295 /* 296 * We need to prepend the address family as 297 * a four byte field. Cons up a dummy header 298 * to pacify bpf. This is safe because bpf 299 * will only read from the mbuf (i.e., it won't 300 * try to free it or keep a pointer a to it). 301 */ 302 struct mbuf m0; 303 u_int af = dst->sa_family; 304 305 m0.m_next = m; 306 m0.m_len = 4; 307 m0.m_data = (char *)⁡ 308 309 #ifdef HAVE_OLD_BPF 310 bpf_mtap(ifp, &m0); 311 #else 312 bpf_mtap(ifp->if_bpf, &m0); 313 #endif 314 } 315 #endif 316 ifp->if_opackets++; 317 ifp->if_obytes += m->m_pkthdr.len; 318 319 /* XXX should we check if our outer source is legal? */ 320 321 switch (sc->gif_psrc->sa_family) { 322 #ifdef INET 323 case AF_INET: 324 error = in_gif_output(ifp, dst->sa_family, m, rt); 325 break; 326 #endif 327 #ifdef INET6 328 case AF_INET6: 329 error = in6_gif_output(ifp, dst->sa_family, m, rt); 330 break; 331 #endif 332 default: 333 m_freem(m); 334 error = ENETDOWN; 335 } 336 337 end: 338 called = 0; /* reset recursion counter */ 339 if (error) ifp->if_oerrors++; 340 return error; 341 } 342 343 void 344 gif_input(m, af, gifp) 345 struct mbuf *m; 346 int af; 347 struct ifnet *gifp; 348 { 349 int s, isr; 350 register struct ifqueue *ifq = 0; 351 352 if (gifp == NULL) { 353 /* just in case */ 354 m_freem(m); 355 return; 356 } 357 358 if (m->m_pkthdr.rcvif) 359 m->m_pkthdr.rcvif = gifp; 360 361 #if NBPFILTER > 0 362 if (gifp->if_bpf) { 363 /* 364 * We need to prepend the address family as 365 * a four byte field. Cons up a dummy header 366 * to pacify bpf. This is safe because bpf 367 * will only read from the mbuf (i.e., it won't 368 * try to free it or keep a pointer a to it). 369 */ 370 struct mbuf m0; 371 u_int af = AF_INET6; 372 373 m0.m_next = m; 374 m0.m_len = 4; 375 m0.m_data = (char *)⁡ 376 377 #ifdef HAVE_OLD_BPF 378 bpf_mtap(gifp, &m0); 379 #else 380 bpf_mtap(gifp->if_bpf, &m0); 381 #endif 382 } 383 #endif /*NBPFILTER > 0*/ 384 385 /* 386 * Put the packet to the network layer input queue according to the 387 * specified address family. 388 * Note: older versions of gif_input directly called network layer 389 * input functions, e.g. ip6_input, here. We changed the policy to 390 * prevent too many recursive calls of such input functions, which 391 * might cause kernel panic. But the change may introduce another 392 * problem; if the input queue is full, packets are discarded. 393 * We believed it rarely occurs and changed the policy. If we find 394 * it occurs more times than we thought, we may change the policy 395 * again. 396 */ 397 switch (af) { 398 #ifdef INET 399 case AF_INET: 400 ifq = &ipintrq; 401 isr = NETISR_IP; 402 break; 403 #endif 404 #ifdef INET6 405 case AF_INET6: 406 ifq = &ip6intrq; 407 isr = NETISR_IPV6; 408 break; 409 #endif 410 default: 411 m_freem(m); 412 return; 413 } 414 415 s = splimp(); 416 if (IF_QFULL(ifq)) { 417 IF_DROP(ifq); /* update statistics */ 418 m_freem(m); 419 splx(s); 420 return; 421 } 422 IF_ENQUEUE(ifq, m); 423 /* we need schednetisr since the address family may change */ 424 schednetisr(isr); 425 gifp->if_ipackets++; 426 gifp->if_ibytes += m->m_pkthdr.len; 427 splx(s); 428 429 return; 430 } 431 432 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 433 int 434 gif_ioctl(ifp, cmd, data) 435 struct ifnet *ifp; 436 #if defined(__FreeBSD__) && __FreeBSD__ < 3 437 int cmd; 438 #else 439 u_long cmd; 440 #endif 441 caddr_t data; 442 { 443 struct gif_softc *sc = (struct gif_softc*)ifp; 444 struct ifreq *ifr = (struct ifreq*)data; 445 int error = 0, size; 446 struct sockaddr *dst, *src; 447 struct sockaddr *sa; 448 int i; 449 struct gif_softc *sc2; 450 451 switch (cmd) { 452 case SIOCSIFADDR: 453 break; 454 455 case SIOCSIFDSTADDR: 456 break; 457 458 case SIOCADDMULTI: 459 case SIOCDELMULTI: 460 #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) 461 switch (ifr->ifr_addr.sa_family) { 462 #ifdef INET 463 case AF_INET: /* IP supports Multicast */ 464 break; 465 #endif /* INET */ 466 #ifdef INET6 467 case AF_INET6: /* IP6 supports Multicast */ 468 break; 469 #endif /* INET6 */ 470 default: /* Other protocols doesn't support Multicast */ 471 error = EAFNOSUPPORT; 472 break; 473 } 474 #endif /*not FreeBSD3*/ 475 break; 476 477 #ifdef SIOCSIFMTU /* xxx */ 478 #ifndef __OpenBSD__ 479 case SIOCGIFMTU: 480 break; 481 case SIOCSIFMTU: 482 { 483 #ifdef __bsdi__ 484 short mtu; 485 mtu = *(short *)ifr->ifr_data; 486 #else 487 u_long mtu; 488 mtu = ifr->ifr_mtu; 489 #endif 490 if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX) { 491 return (EINVAL); 492 } 493 ifp->if_mtu = mtu; 494 } 495 break; 496 #endif /* !OpenBSD */ 497 #endif /* SIOCSIFMTU */ 498 499 case SIOCSIFPHYADDR: 500 #ifdef INET6 501 case SIOCSIFPHYADDR_IN6: 502 #endif /* INET6 */ 503 /* can't configure same pair of address onto two gifs */ 504 src = (struct sockaddr *) 505 &(((struct in_aliasreq *)data)->ifra_addr); 506 dst = (struct sockaddr *) 507 &(((struct in_aliasreq *)data)->ifra_dstaddr); 508 for (i = 0; i < ngif; i++) { 509 sc2 = gif + i; 510 if (sc2 == sc) 511 continue; 512 if (!sc2->gif_pdst || !sc2->gif_psrc) 513 continue; 514 if (sc2->gif_pdst->sa_family == dst->sa_family && 515 sc2->gif_pdst->sa_len == dst->sa_family && 516 bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 && 517 sc2->gif_psrc->sa_family == src->sa_family && 518 sc2->gif_psrc->sa_len == src->sa_family && 519 bcmp(sc2->gif_psrc, src, src->sa_len) == 0) { 520 error = EADDRNOTAVAIL; 521 goto bad; 522 } 523 } 524 525 if (src->sa_family != dst->sa_family || 526 src->sa_len != dst->sa_len) { 527 error = EINVAL; 528 break; 529 } 530 switch (src->sa_family) { 531 #ifdef INET 532 case AF_INET: 533 size = sizeof(struct sockaddr_in); 534 break; 535 #endif 536 #ifdef INET6 537 case AF_INET6: 538 size = sizeof(struct sockaddr_in6); 539 break; 540 #endif 541 default: 542 error = EAFNOSUPPORT; 543 goto bad; 544 } 545 if (src->sa_len != size) { 546 error = EINVAL; 547 break; 548 } 549 550 if (sc->gif_psrc) 551 free((caddr_t)sc->gif_psrc, M_IFADDR); 552 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 553 bcopy((caddr_t)src, (caddr_t)sa, size); 554 sc->gif_psrc = sa; 555 556 if (sc->gif_pdst) 557 free((caddr_t)sc->gif_pdst, M_IFADDR); 558 sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); 559 bcopy((caddr_t)dst, (caddr_t)sa, size); 560 sc->gif_pdst = sa; 561 562 ifp->if_flags |= IFF_UP; 563 if_up(ifp); /* send up RTM_IFINFO */ 564 565 error = 0; 566 break; 567 568 #ifdef SIOCDIFPHYADDR 569 case SIOCDIFPHYADDR: 570 if (sc->gif_psrc) { 571 free((caddr_t)sc->gif_psrc, M_IFADDR); 572 sc->gif_psrc = NULL; 573 } 574 if (sc->gif_pdst) { 575 free((caddr_t)sc->gif_pdst, M_IFADDR); 576 sc->gif_pdst = NULL; 577 } 578 /* change the IFF_UP flag as well? */ 579 break; 580 #endif 581 582 case SIOCGIFPSRCADDR: 583 #ifdef INET6 584 case SIOCGIFPSRCADDR_IN6: 585 #endif /* INET6 */ 586 if (sc->gif_psrc == NULL) { 587 error = EADDRNOTAVAIL; 588 goto bad; 589 } 590 src = sc->gif_psrc; 591 switch (sc->gif_psrc->sa_family) { 592 #ifdef INET 593 case AF_INET: 594 dst = &ifr->ifr_addr; 595 size = sizeof(struct sockaddr_in); 596 break; 597 #endif /* INET */ 598 #ifdef INET6 599 case AF_INET6: 600 dst = (struct sockaddr *) 601 &(((struct in6_ifreq *)data)->ifr_addr); 602 size = sizeof(struct sockaddr_in6); 603 break; 604 #endif /* INET6 */ 605 default: 606 error = EADDRNOTAVAIL; 607 goto bad; 608 } 609 bcopy((caddr_t)src, (caddr_t)dst, size); 610 break; 611 612 case SIOCGIFPDSTADDR: 613 #ifdef INET6 614 case SIOCGIFPDSTADDR_IN6: 615 #endif /* INET6 */ 616 if (sc->gif_pdst == NULL) { 617 error = EADDRNOTAVAIL; 618 goto bad; 619 } 620 src = sc->gif_pdst; 621 switch (sc->gif_pdst->sa_family) { 622 #ifdef INET 623 case AF_INET: 624 dst = &ifr->ifr_addr; 625 size = sizeof(struct sockaddr_in); 626 break; 627 #endif /* INET */ 628 #ifdef INET6 629 case AF_INET6: 630 dst = (struct sockaddr *) 631 &(((struct in6_ifreq *)data)->ifr_addr); 632 size = sizeof(struct sockaddr_in6); 633 break; 634 #endif /* INET6 */ 635 default: 636 error = EADDRNOTAVAIL; 637 goto bad; 638 } 639 bcopy((caddr_t)src, (caddr_t)dst, size); 640 break; 641 642 case SIOCSIFFLAGS: 643 /* if_ioctl() takes care of it */ 644 break; 645 646 default: 647 error = EINVAL; 648 break; 649 } 650 bad: 651 return error; 652 } 653 #endif /*NGIF > 0*/ 654
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