| 1 | /* $NetBSD: if_gif.c,v 1.123 2016/09/15 06:59:32 knakahara 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 1.123 2016/09/15 06:59:32 knakahara 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 | |
| 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 | #include <netinet/in.h> |
| 68 | #include <netinet/in_systm.h> |
| 69 | #include <netinet/ip.h> |
| 70 | #ifdef INET |
| 71 | #include <netinet/in_var.h> |
| 72 | #endif /* INET */ |
| 73 | #include <netinet/in_gif.h> |
| 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 | #endif /* INET6 */ |
| 84 | |
| 85 | #include <netinet/ip_encap.h> |
| 86 | #include <net/if_gif.h> |
| 87 | |
| 88 | #include <net/net_osdep.h> |
| 89 | |
| 90 | #include "ioconf.h" |
| 91 | |
| 92 | #ifdef NET_MPSAFE |
| 93 | #define GIF_MPSAFE 1 |
| 94 | #endif |
| 95 | |
| 96 | /* |
| 97 | * gif global variable definitions |
| 98 | */ |
| 99 | static LIST_HEAD(, gif_softc) gif_softc_list; |
| 100 | |
| 101 | static void gifattach0(struct gif_softc *); |
| 102 | static int gif_output(struct ifnet *, struct mbuf *, |
| 103 | const struct sockaddr *, const struct rtentry *); |
| 104 | static void gif_start(struct ifnet *); |
| 105 | static int gif_transmit(struct ifnet *, struct mbuf *); |
| 106 | static int gif_ioctl(struct ifnet *, u_long, void *); |
| 107 | static int gif_set_tunnel(struct ifnet *, struct sockaddr *, |
| 108 | struct sockaddr *); |
| 109 | static void gif_delete_tunnel(struct ifnet *); |
| 110 | |
| 111 | static int gif_clone_create(struct if_clone *, int); |
| 112 | static int gif_clone_destroy(struct ifnet *); |
| 113 | static int gif_check_nesting(struct ifnet *, struct mbuf *); |
| 114 | |
| 115 | static int gif_encap_attach(struct gif_softc *); |
| 116 | static int gif_encap_detach(struct gif_softc *); |
| 117 | static void gif_encap_pause(struct gif_softc *); |
| 118 | |
| 119 | static struct if_clone gif_cloner = |
| 120 | IF_CLONE_INITIALIZER("gif" , gif_clone_create, gif_clone_destroy); |
| 121 | |
| 122 | #ifndef MAX_GIF_NEST |
| 123 | /* |
| 124 | * This macro controls the upper limitation on nesting of gif tunnels. |
| 125 | * Since, setting a large value to this macro with a careless configuration |
| 126 | * may introduce system crash, we don't allow any nestings by default. |
| 127 | * If you need to configure nested gif tunnels, you can define this macro |
| 128 | * in your kernel configuration file. However, if you do so, please be |
| 129 | * careful to configure the tunnels so that it won't make a loop. |
| 130 | */ |
| 131 | #define MAX_GIF_NEST 1 |
| 132 | #endif |
| 133 | static int max_gif_nesting = MAX_GIF_NEST; |
| 134 | |
| 135 | static struct sysctllog *gif_sysctl; |
| 136 | |
| 137 | static void |
| 138 | gif_sysctl_setup(void) |
| 139 | { |
| 140 | gif_sysctl = NULL; |
| 141 | |
| 142 | #ifdef INET |
| 143 | /* |
| 144 | * Previously create "net.inet.ip" entry to avoid sysctl_createv error. |
| 145 | */ |
| 146 | sysctl_createv(NULL, 0, NULL, NULL, |
| 147 | CTLFLAG_PERMANENT, |
| 148 | CTLTYPE_NODE, "inet" , |
| 149 | SYSCTL_DESCR("PF_INET related settings" ), |
| 150 | NULL, 0, NULL, 0, |
| 151 | CTL_NET, PF_INET, CTL_EOL); |
| 152 | sysctl_createv(NULL, 0, NULL, NULL, |
| 153 | CTLFLAG_PERMANENT, |
| 154 | CTLTYPE_NODE, "ip" , |
| 155 | SYSCTL_DESCR("IPv4 related settings" ), |
| 156 | NULL, 0, NULL, 0, |
| 157 | CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); |
| 158 | |
| 159 | sysctl_createv(&gif_sysctl, 0, NULL, NULL, |
| 160 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 161 | CTLTYPE_INT, "gifttl" , |
| 162 | SYSCTL_DESCR("Default TTL for a gif tunnel datagram" ), |
| 163 | NULL, 0, &ip_gif_ttl, 0, |
| 164 | CTL_NET, PF_INET, IPPROTO_IP, |
| 165 | IPCTL_GIF_TTL, CTL_EOL); |
| 166 | #endif |
| 167 | #ifdef INET6 |
| 168 | /* |
| 169 | * Previously create "net.inet6.ip6" entry to avoid sysctl_createv error. |
| 170 | */ |
| 171 | sysctl_createv(NULL, 0, NULL, NULL, |
| 172 | CTLFLAG_PERMANENT, |
| 173 | CTLTYPE_NODE, "inet6" , |
| 174 | SYSCTL_DESCR("PF_INET6 related settings" ), |
| 175 | NULL, 0, NULL, 0, |
| 176 | CTL_NET, PF_INET6, CTL_EOL); |
| 177 | sysctl_createv(NULL, 0, NULL, NULL, |
| 178 | CTLFLAG_PERMANENT, |
| 179 | CTLTYPE_NODE, "ip6" , |
| 180 | SYSCTL_DESCR("IPv6 related settings" ), |
| 181 | NULL, 0, NULL, 0, |
| 182 | CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); |
| 183 | |
| 184 | sysctl_createv(&gif_sysctl, 0, NULL, NULL, |
| 185 | CTLFLAG_PERMANENT|CTLFLAG_READWRITE, |
| 186 | CTLTYPE_INT, "gifhlim" , |
| 187 | SYSCTL_DESCR("Default hop limit for a gif tunnel datagram" ), |
| 188 | NULL, 0, &ip6_gif_hlim, 0, |
| 189 | CTL_NET, PF_INET6, IPPROTO_IPV6, |
| 190 | IPV6CTL_GIF_HLIM, CTL_EOL); |
| 191 | #endif |
| 192 | } |
| 193 | |
| 194 | /* ARGSUSED */ |
| 195 | void |
| 196 | gifattach(int count) |
| 197 | { |
| 198 | /* |
| 199 | * Nothing to do here, initialization is handled by the |
| 200 | * module initialization code in gifinit() below). |
| 201 | */ |
| 202 | } |
| 203 | |
| 204 | static void |
| 205 | gifinit(void) |
| 206 | { |
| 207 | |
| 208 | LIST_INIT(&gif_softc_list); |
| 209 | if_clone_attach(&gif_cloner); |
| 210 | |
| 211 | gif_sysctl_setup(); |
| 212 | } |
| 213 | |
| 214 | static int |
| 215 | gifdetach(void) |
| 216 | { |
| 217 | int error = 0; |
| 218 | |
| 219 | if (!LIST_EMPTY(&gif_softc_list)) |
| 220 | error = EBUSY; |
| 221 | |
| 222 | if (error == 0) { |
| 223 | if_clone_detach(&gif_cloner); |
| 224 | sysctl_teardown(&gif_sysctl); |
| 225 | } |
| 226 | |
| 227 | return error; |
| 228 | } |
| 229 | |
| 230 | static int |
| 231 | gif_clone_create(struct if_clone *ifc, int unit) |
| 232 | { |
| 233 | struct gif_softc *sc; |
| 234 | |
| 235 | sc = kmem_zalloc(sizeof(struct gif_softc), KM_SLEEP); |
| 236 | if (sc == NULL) |
| 237 | return ENOMEM; |
| 238 | |
| 239 | if_initname(&sc->gif_if, ifc->ifc_name, unit); |
| 240 | |
| 241 | gifattach0(sc); |
| 242 | |
| 243 | LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list); |
| 244 | return (0); |
| 245 | } |
| 246 | |
| 247 | static void |
| 248 | gifattach0(struct gif_softc *sc) |
| 249 | { |
| 250 | |
| 251 | sc->encap_cookie4 = sc->encap_cookie6 = NULL; |
| 252 | |
| 253 | sc->gif_if.if_addrlen = 0; |
| 254 | sc->gif_if.if_mtu = GIF_MTU; |
| 255 | sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; |
| 256 | sc->gif_if.if_extflags = IFEF_NO_LINK_STATE_CHANGE; |
| 257 | #ifdef GIF_MPSAFE |
| 258 | sc->gif_if.if_extflags |= IFEF_OUTPUT_MPSAFE; |
| 259 | #endif |
| 260 | sc->gif_if.if_ioctl = gif_ioctl; |
| 261 | sc->gif_if.if_output = gif_output; |
| 262 | sc->gif_if.if_start = gif_start; |
| 263 | sc->gif_if.if_transmit = gif_transmit; |
| 264 | sc->gif_if.if_type = IFT_GIF; |
| 265 | sc->gif_if.if_dlt = DLT_NULL; |
| 266 | sc->gif_if.if_softc = sc; |
| 267 | IFQ_SET_READY(&sc->gif_if.if_snd); |
| 268 | if_initialize(&sc->gif_if); |
| 269 | if_register(&sc->gif_if); |
| 270 | if_alloc_sadl(&sc->gif_if); |
| 271 | bpf_attach(&sc->gif_if, DLT_NULL, sizeof(u_int)); |
| 272 | } |
| 273 | |
| 274 | static int |
| 275 | gif_clone_destroy(struct ifnet *ifp) |
| 276 | { |
| 277 | struct gif_softc *sc = (void *) ifp; |
| 278 | |
| 279 | LIST_REMOVE(sc, gif_list); |
| 280 | |
| 281 | gif_delete_tunnel(&sc->gif_if); |
| 282 | bpf_detach(ifp); |
| 283 | if_detach(ifp); |
| 284 | rtcache_free(&sc->gif_ro); |
| 285 | |
| 286 | kmem_free(sc, sizeof(struct gif_softc)); |
| 287 | |
| 288 | return (0); |
| 289 | } |
| 290 | |
| 291 | #ifdef GIF_ENCAPCHECK |
| 292 | int |
| 293 | gif_encapcheck(struct mbuf *m, int off, int proto, void *arg) |
| 294 | { |
| 295 | struct ip ip; |
| 296 | struct gif_softc *sc; |
| 297 | |
| 298 | sc = arg; |
| 299 | if (sc == NULL) |
| 300 | return 0; |
| 301 | |
| 302 | if ((sc->gif_if.if_flags & (IFF_UP|IFF_RUNNING)) |
| 303 | != (IFF_UP|IFF_RUNNING)) |
| 304 | return 0; |
| 305 | |
| 306 | /* no physical address */ |
| 307 | if (!sc->gif_psrc || !sc->gif_pdst) |
| 308 | return 0; |
| 309 | |
| 310 | switch (proto) { |
| 311 | #ifdef INET |
| 312 | case IPPROTO_IPV4: |
| 313 | break; |
| 314 | #endif |
| 315 | #ifdef INET6 |
| 316 | case IPPROTO_IPV6: |
| 317 | break; |
| 318 | #endif |
| 319 | default: |
| 320 | return 0; |
| 321 | } |
| 322 | |
| 323 | /* Bail on short packets */ |
| 324 | KASSERT(m->m_flags & M_PKTHDR); |
| 325 | if (m->m_pkthdr.len < sizeof(ip)) |
| 326 | return 0; |
| 327 | |
| 328 | m_copydata(m, 0, sizeof(ip), &ip); |
| 329 | |
| 330 | switch (ip.ip_v) { |
| 331 | #ifdef INET |
| 332 | case 4: |
| 333 | if (sc->gif_psrc->sa_family != AF_INET || |
| 334 | sc->gif_pdst->sa_family != AF_INET) |
| 335 | return 0; |
| 336 | return gif_encapcheck4(m, off, proto, arg); |
| 337 | #endif |
| 338 | #ifdef INET6 |
| 339 | case 6: |
| 340 | if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) |
| 341 | return 0; |
| 342 | if (sc->gif_psrc->sa_family != AF_INET6 || |
| 343 | sc->gif_pdst->sa_family != AF_INET6) |
| 344 | return 0; |
| 345 | return gif_encapcheck6(m, off, proto, arg); |
| 346 | #endif |
| 347 | default: |
| 348 | return 0; |
| 349 | } |
| 350 | } |
| 351 | #endif |
| 352 | |
| 353 | /* |
| 354 | * gif may cause infinite recursion calls when misconfigured. |
| 355 | * We'll prevent this by introducing upper limit. |
| 356 | */ |
| 357 | static int |
| 358 | gif_check_nesting(struct ifnet *ifp, struct mbuf *m) |
| 359 | { |
| 360 | struct m_tag *mtag; |
| 361 | int *count; |
| 362 | |
| 363 | mtag = m_tag_find(m, PACKET_TAG_TUNNEL_INFO, NULL); |
| 364 | if (mtag != NULL) { |
| 365 | count = (int *)(mtag + 1); |
| 366 | if (++(*count) > max_gif_nesting) { |
| 367 | log(LOG_NOTICE, |
| 368 | "%s: recursively called too many times(%d)\n" , |
| 369 | if_name(ifp), |
| 370 | *count); |
| 371 | return EIO; |
| 372 | } |
| 373 | } else { |
| 374 | mtag = m_tag_get(PACKET_TAG_TUNNEL_INFO, sizeof(*count), |
| 375 | M_NOWAIT); |
| 376 | if (mtag != NULL) { |
| 377 | m_tag_prepend(m, mtag); |
| 378 | count = (int *)(mtag + 1); |
| 379 | *count = 0; |
| 380 | } else { |
| 381 | log(LOG_DEBUG, |
| 382 | "%s: m_tag_get() failed, recursion calls are not prevented.\n" , |
| 383 | if_name(ifp)); |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | return 0; |
| 388 | } |
| 389 | |
| 390 | static int |
| 391 | gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, |
| 392 | const struct rtentry *rt) |
| 393 | { |
| 394 | struct gif_softc *sc = ifp->if_softc; |
| 395 | int error = 0; |
| 396 | |
| 397 | IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); |
| 398 | |
| 399 | if ((error = gif_check_nesting(ifp, m)) != 0) { |
| 400 | m_free(m); |
| 401 | goto end; |
| 402 | } |
| 403 | |
| 404 | m->m_flags &= ~(M_BCAST|M_MCAST); |
| 405 | if (((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) || |
| 406 | sc->gif_psrc == NULL || sc->gif_pdst == NULL) { |
| 407 | m_freem(m); |
| 408 | error = ENETDOWN; |
| 409 | goto end; |
| 410 | } |
| 411 | |
| 412 | /* XXX should we check if our outer source is legal? */ |
| 413 | |
| 414 | /* use DLT_NULL encapsulation here to pass inner af type */ |
| 415 | M_PREPEND(m, sizeof(int), M_DONTWAIT); |
| 416 | if (!m) { |
| 417 | error = ENOBUFS; |
| 418 | goto end; |
| 419 | } |
| 420 | *mtod(m, int *) = dst->sa_family; |
| 421 | |
| 422 | /* Clear checksum-offload flags. */ |
| 423 | m->m_pkthdr.csum_flags = 0; |
| 424 | m->m_pkthdr.csum_data = 0; |
| 425 | |
| 426 | error = if_transmit_lock(ifp, m); |
| 427 | end: |
| 428 | if (error) |
| 429 | ifp->if_oerrors++; |
| 430 | return error; |
| 431 | } |
| 432 | |
| 433 | static void |
| 434 | gif_start(struct ifnet *ifp) |
| 435 | { |
| 436 | struct gif_softc *sc; |
| 437 | struct mbuf *m; |
| 438 | int family; |
| 439 | int len; |
| 440 | #ifndef GIF_MPSAFE |
| 441 | int s; |
| 442 | #endif |
| 443 | int error; |
| 444 | |
| 445 | sc = ifp->if_softc; |
| 446 | |
| 447 | /* output processing */ |
| 448 | while (1) { |
| 449 | #ifndef GIF_MPSAFE |
| 450 | s = splnet(); |
| 451 | #endif |
| 452 | IFQ_DEQUEUE(&sc->gif_if.if_snd, m); |
| 453 | #ifndef GIF_MPSAFE |
| 454 | splx(s); |
| 455 | #endif |
| 456 | if (m == NULL) |
| 457 | break; |
| 458 | |
| 459 | /* grab and chop off inner af type */ |
| 460 | if (sizeof(int) > m->m_len) { |
| 461 | m = m_pullup(m, sizeof(int)); |
| 462 | if (!m) { |
| 463 | ifp->if_oerrors++; |
| 464 | continue; |
| 465 | } |
| 466 | } |
| 467 | family = *mtod(m, int *); |
| 468 | bpf_mtap(ifp, m); |
| 469 | m_adj(m, sizeof(int)); |
| 470 | |
| 471 | len = m->m_pkthdr.len; |
| 472 | |
| 473 | /* dispatch to output logic based on outer AF */ |
| 474 | switch (sc->gif_psrc->sa_family) { |
| 475 | #ifdef INET |
| 476 | case AF_INET: |
| 477 | /* XXX |
| 478 | * To add mutex_enter(softnet_lock) or |
| 479 | * KASSERT(mutex_owned(softnet_lock)) here, we shold |
| 480 | * coordinate softnet_lock between in6_if_up() and |
| 481 | * in6_purgeif(). |
| 482 | */ |
| 483 | error = in_gif_output(ifp, family, m); |
| 484 | break; |
| 485 | #endif |
| 486 | #ifdef INET6 |
| 487 | case AF_INET6: |
| 488 | /* XXX |
| 489 | * the same as in_gif_output() |
| 490 | */ |
| 491 | error = in6_gif_output(ifp, family, m); |
| 492 | break; |
| 493 | #endif |
| 494 | default: |
| 495 | m_freem(m); |
| 496 | error = ENETDOWN; |
| 497 | break; |
| 498 | } |
| 499 | |
| 500 | if (error) |
| 501 | ifp->if_oerrors++; |
| 502 | else { |
| 503 | ifp->if_opackets++; |
| 504 | ifp->if_obytes += len; |
| 505 | } |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | static int |
| 510 | gif_transmit(struct ifnet *ifp, struct mbuf *m) |
| 511 | { |
| 512 | struct gif_softc *sc; |
| 513 | int family; |
| 514 | int len; |
| 515 | int error; |
| 516 | |
| 517 | sc = ifp->if_softc; |
| 518 | |
| 519 | /* output processing */ |
| 520 | if (m == NULL) |
| 521 | return EINVAL; |
| 522 | |
| 523 | /* grab and chop off inner af type */ |
| 524 | if (sizeof(int) > m->m_len) { |
| 525 | m = m_pullup(m, sizeof(int)); |
| 526 | if (!m) { |
| 527 | ifp->if_oerrors++; |
| 528 | return ENOBUFS; |
| 529 | } |
| 530 | } |
| 531 | family = *mtod(m, int *); |
| 532 | bpf_mtap(ifp, m); |
| 533 | m_adj(m, sizeof(int)); |
| 534 | |
| 535 | len = m->m_pkthdr.len; |
| 536 | |
| 537 | /* dispatch to output logic based on outer AF */ |
| 538 | switch (sc->gif_psrc->sa_family) { |
| 539 | #ifdef INET |
| 540 | case AF_INET: |
| 541 | /* XXX |
| 542 | * To add mutex_enter(softnet_lock) or |
| 543 | * KASSERT(mutex_owned(softnet_lock)) here, we shold |
| 544 | * coordinate softnet_lock between in6_if_up() and |
| 545 | * in6_purgeif(). |
| 546 | */ |
| 547 | error = in_gif_output(ifp, family, m); |
| 548 | break; |
| 549 | #endif |
| 550 | #ifdef INET6 |
| 551 | case AF_INET6: |
| 552 | /* XXX |
| 553 | * the same as in_gif_output() |
| 554 | */ |
| 555 | error = in6_gif_output(ifp, family, m); |
| 556 | break; |
| 557 | #endif |
| 558 | default: |
| 559 | m_freem(m); |
| 560 | error = ENETDOWN; |
| 561 | break; |
| 562 | } |
| 563 | |
| 564 | if (error) |
| 565 | ifp->if_oerrors++; |
| 566 | else { |
| 567 | ifp->if_opackets++; |
| 568 | ifp->if_obytes += len; |
| 569 | } |
| 570 | |
| 571 | return error; |
| 572 | } |
| 573 | |
| 574 | void |
| 575 | gif_input(struct mbuf *m, int af, struct ifnet *ifp) |
| 576 | { |
| 577 | pktqueue_t *pktq; |
| 578 | size_t pktlen; |
| 579 | #ifndef GIF_MPSAFE |
| 580 | int s; |
| 581 | #endif |
| 582 | |
| 583 | if (ifp == NULL) { |
| 584 | /* just in case */ |
| 585 | m_freem(m); |
| 586 | return; |
| 587 | } |
| 588 | |
| 589 | m_set_rcvif(m, ifp); |
| 590 | pktlen = m->m_pkthdr.len; |
| 591 | |
| 592 | bpf_mtap_af(ifp, af, m); |
| 593 | |
| 594 | /* |
| 595 | * Put the packet to the network layer input queue according to the |
| 596 | * specified address family. Note: we avoid direct call to the |
| 597 | * input function of the network layer in order to avoid recursion. |
| 598 | * This may be revisited in the future. |
| 599 | */ |
| 600 | switch (af) { |
| 601 | #ifdef INET |
| 602 | case AF_INET: |
| 603 | pktq = ip_pktq; |
| 604 | break; |
| 605 | #endif |
| 606 | #ifdef INET6 |
| 607 | case AF_INET6: |
| 608 | pktq = ip6_pktq; |
| 609 | break; |
| 610 | #endif |
| 611 | default: |
| 612 | m_freem(m); |
| 613 | return; |
| 614 | } |
| 615 | |
| 616 | #ifndef GIF_MPSAFE |
| 617 | s = splnet(); |
| 618 | #endif |
| 619 | if (__predict_true(pktq_enqueue(pktq, m, 0))) { |
| 620 | ifp->if_ibytes += pktlen; |
| 621 | ifp->if_ipackets++; |
| 622 | } else { |
| 623 | m_freem(m); |
| 624 | } |
| 625 | #ifndef GIF_MPSAFE |
| 626 | splx(s); |
| 627 | #endif |
| 628 | } |
| 629 | |
| 630 | /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ |
| 631 | static int |
| 632 | gif_ioctl(struct ifnet *ifp, u_long cmd, void *data) |
| 633 | { |
| 634 | struct gif_softc *sc = ifp->if_softc; |
| 635 | struct ifreq *ifr = (struct ifreq*)data; |
| 636 | struct ifaddr *ifa = (struct ifaddr*)data; |
| 637 | int error = 0, size; |
| 638 | struct sockaddr *dst, *src; |
| 639 | |
| 640 | switch (cmd) { |
| 641 | case SIOCINITIFADDR: |
| 642 | ifp->if_flags |= IFF_UP; |
| 643 | ifa->ifa_rtrequest = p2p_rtrequest; |
| 644 | break; |
| 645 | |
| 646 | case SIOCADDMULTI: |
| 647 | case SIOCDELMULTI: |
| 648 | switch (ifr->ifr_addr.sa_family) { |
| 649 | #ifdef INET |
| 650 | case AF_INET: /* IP supports Multicast */ |
| 651 | break; |
| 652 | #endif /* INET */ |
| 653 | #ifdef INET6 |
| 654 | case AF_INET6: /* IP6 supports Multicast */ |
| 655 | break; |
| 656 | #endif /* INET6 */ |
| 657 | default: /* Other protocols doesn't support Multicast */ |
| 658 | error = EAFNOSUPPORT; |
| 659 | break; |
| 660 | } |
| 661 | break; |
| 662 | |
| 663 | case SIOCSIFMTU: |
| 664 | if (ifr->ifr_mtu < GIF_MTU_MIN || ifr->ifr_mtu > GIF_MTU_MAX) |
| 665 | return EINVAL; |
| 666 | else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) |
| 667 | error = 0; |
| 668 | break; |
| 669 | |
| 670 | #ifdef INET |
| 671 | case SIOCSIFPHYADDR: |
| 672 | #endif |
| 673 | #ifdef INET6 |
| 674 | case SIOCSIFPHYADDR_IN6: |
| 675 | #endif /* INET6 */ |
| 676 | case SIOCSLIFPHYADDR: |
| 677 | switch (cmd) { |
| 678 | #ifdef INET |
| 679 | case SIOCSIFPHYADDR: |
| 680 | src = (struct sockaddr *) |
| 681 | &(((struct in_aliasreq *)data)->ifra_addr); |
| 682 | dst = (struct sockaddr *) |
| 683 | &(((struct in_aliasreq *)data)->ifra_dstaddr); |
| 684 | break; |
| 685 | #endif |
| 686 | #ifdef INET6 |
| 687 | case SIOCSIFPHYADDR_IN6: |
| 688 | src = (struct sockaddr *) |
| 689 | &(((struct in6_aliasreq *)data)->ifra_addr); |
| 690 | dst = (struct sockaddr *) |
| 691 | &(((struct in6_aliasreq *)data)->ifra_dstaddr); |
| 692 | break; |
| 693 | #endif |
| 694 | case SIOCSLIFPHYADDR: |
| 695 | src = (struct sockaddr *) |
| 696 | &(((struct if_laddrreq *)data)->addr); |
| 697 | dst = (struct sockaddr *) |
| 698 | &(((struct if_laddrreq *)data)->dstaddr); |
| 699 | break; |
| 700 | default: |
| 701 | return EINVAL; |
| 702 | } |
| 703 | |
| 704 | /* sa_family must be equal */ |
| 705 | if (src->sa_family != dst->sa_family) |
| 706 | return EINVAL; |
| 707 | |
| 708 | /* validate sa_len */ |
| 709 | switch (src->sa_family) { |
| 710 | #ifdef INET |
| 711 | case AF_INET: |
| 712 | if (src->sa_len != sizeof(struct sockaddr_in)) |
| 713 | return EINVAL; |
| 714 | break; |
| 715 | #endif |
| 716 | #ifdef INET6 |
| 717 | case AF_INET6: |
| 718 | if (src->sa_len != sizeof(struct sockaddr_in6)) |
| 719 | return EINVAL; |
| 720 | break; |
| 721 | #endif |
| 722 | default: |
| 723 | return EAFNOSUPPORT; |
| 724 | } |
| 725 | switch (dst->sa_family) { |
| 726 | #ifdef INET |
| 727 | case AF_INET: |
| 728 | if (dst->sa_len != sizeof(struct sockaddr_in)) |
| 729 | return EINVAL; |
| 730 | break; |
| 731 | #endif |
| 732 | #ifdef INET6 |
| 733 | case AF_INET6: |
| 734 | if (dst->sa_len != sizeof(struct sockaddr_in6)) |
| 735 | return EINVAL; |
| 736 | break; |
| 737 | #endif |
| 738 | default: |
| 739 | return EAFNOSUPPORT; |
| 740 | } |
| 741 | |
| 742 | /* check sa_family looks sane for the cmd */ |
| 743 | switch (cmd) { |
| 744 | case SIOCSIFPHYADDR: |
| 745 | if (src->sa_family == AF_INET) |
| 746 | break; |
| 747 | return EAFNOSUPPORT; |
| 748 | #ifdef INET6 |
| 749 | case SIOCSIFPHYADDR_IN6: |
| 750 | if (src->sa_family == AF_INET6) |
| 751 | break; |
| 752 | return EAFNOSUPPORT; |
| 753 | #endif /* INET6 */ |
| 754 | case SIOCSLIFPHYADDR: |
| 755 | /* checks done in the above */ |
| 756 | break; |
| 757 | } |
| 758 | |
| 759 | error = gif_set_tunnel(&sc->gif_if, src, dst); |
| 760 | break; |
| 761 | |
| 762 | #ifdef SIOCDIFPHYADDR |
| 763 | case SIOCDIFPHYADDR: |
| 764 | gif_delete_tunnel(&sc->gif_if); |
| 765 | break; |
| 766 | #endif |
| 767 | |
| 768 | case SIOCGIFPSRCADDR: |
| 769 | #ifdef INET6 |
| 770 | case SIOCGIFPSRCADDR_IN6: |
| 771 | #endif /* INET6 */ |
| 772 | if (sc->gif_psrc == NULL) { |
| 773 | error = EADDRNOTAVAIL; |
| 774 | goto bad; |
| 775 | } |
| 776 | src = sc->gif_psrc; |
| 777 | switch (cmd) { |
| 778 | #ifdef INET |
| 779 | case SIOCGIFPSRCADDR: |
| 780 | dst = &ifr->ifr_addr; |
| 781 | size = sizeof(ifr->ifr_addr); |
| 782 | break; |
| 783 | #endif /* INET */ |
| 784 | #ifdef INET6 |
| 785 | case SIOCGIFPSRCADDR_IN6: |
| 786 | dst = (struct sockaddr *) |
| 787 | &(((struct in6_ifreq *)data)->ifr_addr); |
| 788 | size = sizeof(((struct in6_ifreq *)data)->ifr_addr); |
| 789 | break; |
| 790 | #endif /* INET6 */ |
| 791 | default: |
| 792 | error = EADDRNOTAVAIL; |
| 793 | goto bad; |
| 794 | } |
| 795 | if (src->sa_len > size) |
| 796 | return EINVAL; |
| 797 | memcpy(dst, src, src->sa_len); |
| 798 | break; |
| 799 | |
| 800 | case SIOCGIFPDSTADDR: |
| 801 | #ifdef INET6 |
| 802 | case SIOCGIFPDSTADDR_IN6: |
| 803 | #endif /* INET6 */ |
| 804 | if (sc->gif_pdst == NULL) { |
| 805 | error = EADDRNOTAVAIL; |
| 806 | goto bad; |
| 807 | } |
| 808 | src = sc->gif_pdst; |
| 809 | switch (cmd) { |
| 810 | #ifdef INET |
| 811 | case SIOCGIFPDSTADDR: |
| 812 | dst = &ifr->ifr_addr; |
| 813 | size = sizeof(ifr->ifr_addr); |
| 814 | break; |
| 815 | #endif /* INET */ |
| 816 | #ifdef INET6 |
| 817 | case SIOCGIFPDSTADDR_IN6: |
| 818 | dst = (struct sockaddr *) |
| 819 | &(((struct in6_ifreq *)data)->ifr_addr); |
| 820 | size = sizeof(((struct in6_ifreq *)data)->ifr_addr); |
| 821 | break; |
| 822 | #endif /* INET6 */ |
| 823 | default: |
| 824 | error = EADDRNOTAVAIL; |
| 825 | goto bad; |
| 826 | } |
| 827 | if (src->sa_len > size) |
| 828 | return EINVAL; |
| 829 | memcpy(dst, src, src->sa_len); |
| 830 | break; |
| 831 | |
| 832 | case SIOCGLIFPHYADDR: |
| 833 | if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) { |
| 834 | error = EADDRNOTAVAIL; |
| 835 | goto bad; |
| 836 | } |
| 837 | |
| 838 | /* copy src */ |
| 839 | src = sc->gif_psrc; |
| 840 | dst = (struct sockaddr *) |
| 841 | &(((struct if_laddrreq *)data)->addr); |
| 842 | size = sizeof(((struct if_laddrreq *)data)->addr); |
| 843 | if (src->sa_len > size) |
| 844 | return EINVAL; |
| 845 | memcpy(dst, src, src->sa_len); |
| 846 | |
| 847 | /* copy dst */ |
| 848 | src = sc->gif_pdst; |
| 849 | dst = (struct sockaddr *) |
| 850 | &(((struct if_laddrreq *)data)->dstaddr); |
| 851 | size = sizeof(((struct if_laddrreq *)data)->dstaddr); |
| 852 | if (src->sa_len > size) |
| 853 | return EINVAL; |
| 854 | memcpy(dst, src, src->sa_len); |
| 855 | break; |
| 856 | |
| 857 | default: |
| 858 | return ifioctl_common(ifp, cmd, data); |
| 859 | } |
| 860 | bad: |
| 861 | return error; |
| 862 | } |
| 863 | |
| 864 | static int |
| 865 | gif_encap_attach(struct gif_softc *sc) |
| 866 | { |
| 867 | int error; |
| 868 | |
| 869 | if (sc == NULL || sc->gif_psrc == NULL) |
| 870 | return EINVAL; |
| 871 | |
| 872 | switch (sc->gif_psrc->sa_family) { |
| 873 | #ifdef INET |
| 874 | case AF_INET: |
| 875 | error = in_gif_attach(sc); |
| 876 | break; |
| 877 | #endif |
| 878 | #ifdef INET6 |
| 879 | case AF_INET6: |
| 880 | error = in6_gif_attach(sc); |
| 881 | break; |
| 882 | #endif |
| 883 | default: |
| 884 | error = EINVAL; |
| 885 | break; |
| 886 | } |
| 887 | |
| 888 | return error; |
| 889 | } |
| 890 | |
| 891 | static int |
| 892 | gif_encap_detach(struct gif_softc *sc) |
| 893 | { |
| 894 | int error; |
| 895 | |
| 896 | if (sc == NULL || sc->gif_psrc == NULL) |
| 897 | return EINVAL; |
| 898 | |
| 899 | switch (sc->gif_psrc->sa_family) { |
| 900 | #ifdef INET |
| 901 | case AF_INET: |
| 902 | error = in_gif_detach(sc); |
| 903 | break; |
| 904 | #endif |
| 905 | #ifdef INET6 |
| 906 | case AF_INET6: |
| 907 | error = in6_gif_detach(sc); |
| 908 | break; |
| 909 | #endif |
| 910 | default: |
| 911 | error = EINVAL; |
| 912 | break; |
| 913 | } |
| 914 | |
| 915 | return error; |
| 916 | } |
| 917 | |
| 918 | static void |
| 919 | gif_encap_pause(struct gif_softc *sc) |
| 920 | { |
| 921 | struct ifnet *ifp; |
| 922 | uint64_t where; |
| 923 | |
| 924 | if (sc == NULL || sc->gif_psrc == NULL) |
| 925 | return; |
| 926 | |
| 927 | ifp = &sc->gif_if; |
| 928 | if ((ifp->if_flags & IFF_RUNNING) == 0) |
| 929 | return; |
| 930 | |
| 931 | switch (sc->gif_psrc->sa_family) { |
| 932 | #ifdef INET |
| 933 | case AF_INET: |
| 934 | (void)in_gif_pause(sc); |
| 935 | break; |
| 936 | #endif |
| 937 | #ifdef INET6 |
| 938 | case AF_INET6: |
| 939 | (void)in6_gif_pause(sc); |
| 940 | break; |
| 941 | #endif |
| 942 | } |
| 943 | |
| 944 | ifp->if_flags &= ~IFF_RUNNING; |
| 945 | /* membar_sync() is done in xc_broadcast(). */ |
| 946 | |
| 947 | /* |
| 948 | * Wait for softint_execute()(ipintr() or ip6intr()) |
| 949 | * completion done by other CPUs which already run over if_flags |
| 950 | * check in in_gif_input() or in6_gif_input(). |
| 951 | * Furthermore, wait for gif_output() completion too. |
| 952 | */ |
| 953 | where = xc_broadcast(0, (xcfunc_t)nullop, NULL, NULL); |
| 954 | xc_wait(where); |
| 955 | } |
| 956 | |
| 957 | static int |
| 958 | gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) |
| 959 | { |
| 960 | struct gif_softc *sc = ifp->if_softc; |
| 961 | struct gif_softc *sc2; |
| 962 | struct sockaddr *osrc, *odst; |
| 963 | struct sockaddr *nsrc, *ndst; |
| 964 | int error; |
| 965 | #ifndef GIF_MPSAFE |
| 966 | int s; |
| 967 | |
| 968 | s = splsoftnet(); |
| 969 | #endif |
| 970 | error = encap_lock_enter(); |
| 971 | if (error) { |
| 972 | #ifndef GIF_MPSAFE |
| 973 | splx(s); |
| 974 | #endif |
| 975 | return error; |
| 976 | } |
| 977 | |
| 978 | LIST_FOREACH(sc2, &gif_softc_list, gif_list) { |
| 979 | if (sc2 == sc) |
| 980 | continue; |
| 981 | if (!sc2->gif_pdst || !sc2->gif_psrc) |
| 982 | continue; |
| 983 | /* can't configure same pair of address onto two gifs */ |
| 984 | if (sockaddr_cmp(sc2->gif_pdst, dst) == 0 && |
| 985 | sockaddr_cmp(sc2->gif_psrc, src) == 0) { |
| 986 | /* continue to use the old configureation. */ |
| 987 | error = EADDRNOTAVAIL; |
| 988 | goto out; |
| 989 | } |
| 990 | |
| 991 | /* XXX both end must be valid? (I mean, not 0.0.0.0) */ |
| 992 | } |
| 993 | |
| 994 | nsrc = sockaddr_dup(src, M_WAITOK); |
| 995 | ndst = sockaddr_dup(dst, M_WAITOK); |
| 996 | |
| 997 | gif_encap_pause(sc); |
| 998 | |
| 999 | /* Firstly, clear old configurations. */ |
| 1000 | /* XXX we can detach from both, but be polite just in case */ |
| 1001 | if (sc->gif_psrc) |
| 1002 | (void)gif_encap_detach(sc); |
| 1003 | |
| 1004 | /* |
| 1005 | * Secondly, try to set new configurations. |
| 1006 | * If the setup failed, rollback to old configurations. |
| 1007 | */ |
| 1008 | do { |
| 1009 | osrc = sc->gif_psrc; |
| 1010 | odst = sc->gif_pdst; |
| 1011 | sc->gif_psrc = nsrc; |
| 1012 | sc->gif_pdst = ndst; |
| 1013 | |
| 1014 | error = gif_encap_attach(sc); |
| 1015 | if (error) { |
| 1016 | /* rollback to the last configuration. */ |
| 1017 | nsrc = osrc; |
| 1018 | ndst = odst; |
| 1019 | osrc = sc->gif_psrc; |
| 1020 | odst = sc->gif_pdst; |
| 1021 | |
| 1022 | continue; |
| 1023 | } |
| 1024 | } while (error != 0 && (nsrc != NULL && ndst != NULL)); |
| 1025 | /* Thirdly, even rollback failed, clear configurations. */ |
| 1026 | if (error) { |
| 1027 | osrc = sc->gif_psrc; |
| 1028 | odst = sc->gif_pdst; |
| 1029 | sc->gif_psrc = NULL; |
| 1030 | sc->gif_pdst = NULL; |
| 1031 | } |
| 1032 | |
| 1033 | if (osrc) |
| 1034 | sockaddr_free(osrc); |
| 1035 | if (odst) |
| 1036 | sockaddr_free(odst); |
| 1037 | |
| 1038 | if (sc->gif_psrc && sc->gif_pdst) |
| 1039 | ifp->if_flags |= IFF_RUNNING; |
| 1040 | else |
| 1041 | ifp->if_flags &= ~IFF_RUNNING; |
| 1042 | |
| 1043 | out: |
| 1044 | encap_lock_exit(); |
| 1045 | #ifndef GIF_MPSAFE |
| 1046 | splx(s); |
| 1047 | #endif |
| 1048 | return error; |
| 1049 | } |
| 1050 | |
| 1051 | static void |
| 1052 | gif_delete_tunnel(struct ifnet *ifp) |
| 1053 | { |
| 1054 | struct gif_softc *sc = ifp->if_softc; |
| 1055 | int error; |
| 1056 | #ifndef GIF_MPSAFE |
| 1057 | int s; |
| 1058 | |
| 1059 | s = splsoftnet(); |
| 1060 | #endif |
| 1061 | error = encap_lock_enter(); |
| 1062 | if (error) { |
| 1063 | #ifndef GIF_MPSAFE |
| 1064 | splx(s); |
| 1065 | #endif |
| 1066 | return; |
| 1067 | } |
| 1068 | |
| 1069 | gif_encap_pause(sc); |
| 1070 | if (sc->gif_psrc) { |
| 1071 | sockaddr_free(sc->gif_psrc); |
| 1072 | sc->gif_psrc = NULL; |
| 1073 | } |
| 1074 | if (sc->gif_pdst) { |
| 1075 | sockaddr_free(sc->gif_pdst); |
| 1076 | sc->gif_pdst = NULL; |
| 1077 | } |
| 1078 | /* it is safe to detach from both */ |
| 1079 | #ifdef INET |
| 1080 | (void)in_gif_detach(sc); |
| 1081 | #endif |
| 1082 | #ifdef INET6 |
| 1083 | (void)in6_gif_detach(sc); |
| 1084 | #endif |
| 1085 | |
| 1086 | if (sc->gif_psrc && sc->gif_pdst) |
| 1087 | ifp->if_flags |= IFF_RUNNING; |
| 1088 | else |
| 1089 | ifp->if_flags &= ~IFF_RUNNING; |
| 1090 | |
| 1091 | encap_lock_exit(); |
| 1092 | #ifndef GIF_MPSAFE |
| 1093 | splx(s); |
| 1094 | #endif |
| 1095 | } |
| 1096 | |
| 1097 | /* |
| 1098 | * Module infrastructure |
| 1099 | */ |
| 1100 | #include "if_module.h" |
| 1101 | |
| 1102 | IF_MODULE(MODULE_CLASS_DRIVER, gif, "" ) |
| 1103 | |