1 /* $NetBSD: if_gre.c,v 1.185 2024/02/03 19:05:14 jdolecek Exp $ */ 2 3 /* 4 * Copyright (c) 1998, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Heiko W.Rupp <hwr@pilhuhn.de> 9 * 10 * IPv6-over-GRE contributed by Gert Doering <gert@greenie.muc.de> 11 * 12 * GRE over UDP/IPv4/IPv6 sockets contributed by David Young <dyoung@NetBSD.org> 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 24 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 25 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 26 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 27 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 30 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 31 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 33 * POSSIBILITY OF SUCH DAMAGE. 34 * 35 * This material is based upon work partially supported by NSF 36 * under Contract No. NSF CNS-0626584. 37 */ 38 39 /* 40 * Encapsulate L3 protocols into IP 41 * See RFC 1701 and 1702 for more details. 42 * If_gre is compatible with Cisco GRE tunnels, so you can 43 * have a NetBSD box as the other end of a tunnel interface of a Cisco 44 * router. See gre(4) for more details. 45 */ 46 47 #include <sys/cdefs.h> 48 __KERNEL_RCSID(0, "$NetBSD: if_gre.c,v 1.185 2024/02/03 19:05:14 jdolecek Exp $"); 49 50 #ifdef _KERNEL_OPT 51 #include "opt_atalk.h" 52 #include "opt_gre.h" 53 #include "opt_inet.h" 54 #include "opt_mpls.h" 55 #endif 56 57 #include <sys/param.h> 58 #include <sys/file.h> 59 #include <sys/filedesc.h> 60 #include <sys/malloc.h> 61 #include <sys/mallocvar.h> 62 #include <sys/mbuf.h> 63 #include <sys/proc.h> 64 #include <sys/domain.h> 65 #include <sys/protosw.h> 66 #include <sys/socket.h> 67 #include <sys/socketvar.h> 68 #include <sys/ioctl.h> 69 #include <sys/queue.h> 70 #include <sys/intr.h> 71 #include <sys/systm.h> 72 #include <sys/sysctl.h> 73 #include <sys/kauth.h> 74 #include <sys/device.h> 75 #include <sys/module.h> 76 77 #include <sys/kernel.h> 78 #include <sys/mutex.h> 79 #include <sys/condvar.h> 80 #include <sys/kthread.h> 81 82 #include <sys/cpu.h> 83 84 #include <net/ethertypes.h> 85 #include <net/if.h> 86 #include <net/if_types.h> 87 #include <net/route.h> 88 #include <sys/device.h> 89 #include <sys/module.h> 90 #include <sys/atomic.h> 91 92 #include <netinet/in_systm.h> 93 #include <netinet/in.h> 94 #include <netinet/ip.h> /* we always need this for sizeof(struct ip) */ 95 96 #ifdef INET 97 #include <netinet/in_var.h> 98 #include <netinet/ip_var.h> 99 #endif 100 101 #ifdef INET6 102 #include <netinet6/in6_var.h> 103 #endif 104 105 #ifdef MPLS 106 #include <netmpls/mpls.h> 107 #include <netmpls/mpls_var.h> 108 #endif 109 110 #ifdef NETATALK 111 #include <netatalk/at.h> 112 #include <netatalk/at_var.h> 113 #include <netatalk/at_extern.h> 114 #endif 115 116 #include <sys/time.h> 117 #include <net/bpf.h> 118 119 #include <net/if_gre.h> 120 121 #include "ioconf.h" 122 123 /* 124 * It is not easy to calculate the right value for a GRE MTU. 125 * We leave this task to the admin and use the same default that 126 * other vendors use. 127 */ 128 #define GREMTU 1476 129 130 #ifdef GRE_DEBUG 131 int gre_debug = 0; 132 #define GRE_DPRINTF(__sc, ...) \ 133 do { \ 134 if (__predict_false(gre_debug || \ 135 ((__sc)->sc_if.if_flags & IFF_DEBUG) != 0)) { \ 136 printf("%s.%d: ", __func__, __LINE__); \ 137 printf(__VA_ARGS__); \ 138 } \ 139 } while (/*CONSTCOND*/0) 140 #else 141 #define GRE_DPRINTF(__sc, __fmt, ...) do { } while (/*CONSTCOND*/0) 142 #endif /* GRE_DEBUG */ 143 144 CTASSERT(sizeof(struct gre_h) == 4); 145 146 int ip_gre_ttl = GRE_TTL; 147 148 static u_int gre_count; 149 150 static int gre_clone_create(struct if_clone *, int); 151 static int gre_clone_destroy(struct ifnet *); 152 153 static struct if_clone gre_cloner = 154 IF_CLONE_INITIALIZER("gre", gre_clone_create, gre_clone_destroy); 155 156 static int gre_input(struct gre_softc *, struct mbuf *, const struct gre_h *); 157 static bool gre_is_nullconf(const struct gre_soparm *); 158 static int gre_output(struct ifnet *, struct mbuf *, 159 const struct sockaddr *, const struct rtentry *); 160 static int gre_ioctl(struct ifnet *, u_long, void *); 161 static int gre_getsockname(struct socket *, struct sockaddr *); 162 static int gre_getpeername(struct socket *, struct sockaddr *); 163 static int gre_getnames(struct socket *, struct lwp *, 164 struct sockaddr_storage *, struct sockaddr_storage *); 165 static void gre_clearconf(struct gre_soparm *, bool); 166 static int gre_soreceive(struct socket *, struct mbuf **); 167 static int gre_sosend(struct socket *, struct mbuf *); 168 static struct socket *gre_reconf(struct gre_softc *, const struct gre_soparm *); 169 170 static bool gre_fp_send(struct gre_softc *, enum gre_msg, file_t *); 171 static bool gre_fp_recv(struct gre_softc *); 172 static void gre_fp_recvloop(void *); 173 174 static void 175 gre_bufq_init(struct gre_bufq *bq, size_t len0) 176 { 177 memset(bq, 0, sizeof(*bq)); 178 bq->bq_q = pcq_create(len0, KM_SLEEP); 179 KASSERT(bq->bq_q != NULL); 180 } 181 182 static struct mbuf * 183 gre_bufq_dequeue(struct gre_bufq *bq) 184 { 185 return pcq_get(bq->bq_q); 186 } 187 188 static void 189 gre_bufq_purge(struct gre_bufq *bq) 190 { 191 struct mbuf *m; 192 193 while ((m = gre_bufq_dequeue(bq)) != NULL) 194 m_freem(m); 195 } 196 197 static void 198 gre_bufq_destroy(struct gre_bufq *bq) 199 { 200 gre_bufq_purge(bq); 201 pcq_destroy(bq->bq_q); 202 } 203 204 static int 205 gre_bufq_enqueue(struct gre_bufq *bq, struct mbuf *m) 206 { 207 KASSERT(bq->bq_q != NULL); 208 209 if (!pcq_put(bq->bq_q, m)) { 210 bq->bq_drops++; 211 return ENOBUFS; 212 } 213 return 0; 214 } 215 216 static void 217 greintr(void *arg) 218 { 219 struct gre_softc *sc = (struct gre_softc *)arg; 220 struct socket *so = sc->sc_soparm.sp_so; 221 int rc; 222 struct mbuf *m; 223 224 KASSERT(so != NULL); 225 226 sc->sc_send_ev.ev_count++; 227 GRE_DPRINTF(sc, "enter\n"); 228 while ((m = gre_bufq_dequeue(&sc->sc_snd)) != NULL) { 229 /* XXX handle ENOBUFS? */ 230 if ((rc = gre_sosend(so, m)) != 0) 231 GRE_DPRINTF(sc, "gre_sosend failed %d\n", rc); 232 } 233 } 234 235 /* Caller must hold sc->sc_mtx. */ 236 static void 237 gre_fp_wait(struct gre_softc *sc) 238 { 239 sc->sc_fp_waiters++; 240 cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); 241 sc->sc_fp_waiters--; 242 } 243 244 static void 245 gre_evcnt_detach(struct gre_softc *sc) 246 { 247 evcnt_detach(&sc->sc_recv_ev); 248 evcnt_detach(&sc->sc_block_ev); 249 evcnt_detach(&sc->sc_error_ev); 250 evcnt_detach(&sc->sc_pullup_ev); 251 evcnt_detach(&sc->sc_unsupp_ev); 252 253 evcnt_detach(&sc->sc_send_ev); 254 evcnt_detach(&sc->sc_oflow_ev); 255 } 256 257 static void 258 gre_evcnt_attach(struct gre_softc *sc) 259 { 260 evcnt_attach_dynamic(&sc->sc_recv_ev, EVCNT_TYPE_MISC, 261 NULL, sc->sc_if.if_xname, "recv"); 262 evcnt_attach_dynamic(&sc->sc_block_ev, EVCNT_TYPE_MISC, 263 &sc->sc_recv_ev, sc->sc_if.if_xname, "would block"); 264 evcnt_attach_dynamic(&sc->sc_error_ev, EVCNT_TYPE_MISC, 265 &sc->sc_recv_ev, sc->sc_if.if_xname, "error"); 266 evcnt_attach_dynamic(&sc->sc_pullup_ev, EVCNT_TYPE_MISC, 267 &sc->sc_recv_ev, sc->sc_if.if_xname, "pullup failed"); 268 evcnt_attach_dynamic(&sc->sc_unsupp_ev, EVCNT_TYPE_MISC, 269 &sc->sc_recv_ev, sc->sc_if.if_xname, "unsupported"); 270 271 evcnt_attach_dynamic(&sc->sc_send_ev, EVCNT_TYPE_MISC, 272 NULL, sc->sc_if.if_xname, "send"); 273 evcnt_attach_dynamic(&sc->sc_oflow_ev, EVCNT_TYPE_MISC, 274 &sc->sc_send_ev, sc->sc_if.if_xname, "overflow"); 275 } 276 277 static int 278 gre_clone_create(struct if_clone *ifc, int unit) 279 { 280 int rc; 281 struct gre_softc *sc; 282 struct gre_soparm *sp; 283 const struct sockaddr *any; 284 285 if ((any = sockaddr_any_by_family(AF_INET)) == NULL && 286 (any = sockaddr_any_by_family(AF_INET6)) == NULL) 287 goto fail0; 288 289 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 290 mutex_init(&sc->sc_mtx, MUTEX_DRIVER, IPL_SOFTNET); 291 cv_init(&sc->sc_condvar, "gre wait"); 292 cv_init(&sc->sc_fp_condvar, "gre fp"); 293 294 if_initname(&sc->sc_if, ifc->ifc_name, unit); 295 sc->sc_if.if_softc = sc; 296 sc->sc_if.if_type = IFT_TUNNEL; 297 sc->sc_if.if_addrlen = 0; 298 sc->sc_if.if_hdrlen = sizeof(struct ip) + sizeof(struct gre_h); 299 sc->sc_if.if_dlt = DLT_NULL; 300 sc->sc_if.if_mtu = GREMTU; 301 sc->sc_if.if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 302 sc->sc_if.if_output = gre_output; 303 sc->sc_if.if_ioctl = gre_ioctl; 304 sp = &sc->sc_soparm; 305 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), any); 306 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), any); 307 sp->sp_proto = IPPROTO_GRE; 308 sp->sp_type = SOCK_RAW; 309 310 sc->sc_fd = -1; 311 312 rc = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, gre_fp_recvloop, sc, 313 NULL, "%s", sc->sc_if.if_xname); 314 if (rc) 315 goto fail1; 316 317 gre_evcnt_attach(sc); 318 319 gre_bufq_init(&sc->sc_snd, 17); 320 sc->sc_if.if_flags |= IFF_LINK0; 321 if_attach(&sc->sc_if); 322 if_alloc_sadl(&sc->sc_if); 323 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(uint32_t)); 324 atomic_inc_uint(&gre_count); 325 return 0; 326 327 fail1: 328 cv_destroy(&sc->sc_fp_condvar); 329 cv_destroy(&sc->sc_condvar); 330 mutex_destroy(&sc->sc_mtx); 331 free(sc, M_DEVBUF); 332 333 fail0: 334 return -1; 335 } 336 337 static int 338 gre_clone_destroy(struct ifnet *ifp) 339 { 340 int s; 341 struct gre_softc *sc = ifp->if_softc; 342 343 GRE_DPRINTF(sc, "\n"); 344 345 bpf_detach(ifp); 346 s = splnet(); 347 if_detach(ifp); 348 349 GRE_DPRINTF(sc, "\n"); 350 /* Note that we must not hold the mutex while we call gre_reconf(). */ 351 gre_reconf(sc, NULL); 352 353 mutex_enter(&sc->sc_mtx); 354 sc->sc_msg = GRE_M_STOP; 355 cv_signal(&sc->sc_fp_condvar); 356 while (sc->sc_fp_waiters > 0) 357 cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); 358 mutex_exit(&sc->sc_mtx); 359 360 splx(s); 361 362 cv_destroy(&sc->sc_condvar); 363 cv_destroy(&sc->sc_fp_condvar); 364 mutex_destroy(&sc->sc_mtx); 365 gre_bufq_destroy(&sc->sc_snd); 366 gre_evcnt_detach(sc); 367 free(sc, M_DEVBUF); 368 369 atomic_dec_uint(&gre_count); 370 return 0; 371 } 372 373 static void 374 gre_receive(struct socket *so, void *arg, int events, int waitflag) 375 { 376 struct gre_softc *sc = (struct gre_softc *)arg; 377 int rc; 378 struct gre_h gh; 379 struct mbuf *m; 380 381 GRE_DPRINTF(sc, "enter\n"); 382 383 sc->sc_recv_ev.ev_count++; 384 385 rc = gre_soreceive(so, &m); 386 /* TBD Back off if ECONNREFUSED (indicates 387 * ICMP Port Unreachable)? 388 */ 389 if (rc == EWOULDBLOCK) { 390 GRE_DPRINTF(sc, "EWOULDBLOCK\n"); 391 sc->sc_block_ev.ev_count++; 392 return; 393 } else if (rc != 0 || m == NULL) { 394 GRE_DPRINTF(sc, "%s: rc %d m %p\n", 395 sc->sc_if.if_xname, rc, (void *)m); 396 sc->sc_error_ev.ev_count++; 397 return; 398 } 399 400 if (__predict_false(m->m_len < sizeof(gh))) { 401 if ((m = m_pullup(m, sizeof(gh))) == NULL) { 402 GRE_DPRINTF(sc, "m_pullup failed\n"); 403 sc->sc_pullup_ev.ev_count++; 404 return; 405 } 406 } 407 memcpy(&gh, mtod(m, void *), sizeof(gh)); 408 409 if (gre_input(sc, m, &gh) == 0) { 410 sc->sc_unsupp_ev.ev_count++; 411 GRE_DPRINTF(sc, "dropping unsupported\n"); 412 m_freem(m); 413 } 414 } 415 416 static void 417 gre_upcall_add(struct socket *so, void *arg) 418 { 419 /* XXX What if the kernel already set an upcall? */ 420 KASSERT((so->so_rcv.sb_flags & SB_UPCALL) == 0); 421 so->so_upcallarg = arg; 422 so->so_upcall = gre_receive; 423 so->so_rcv.sb_flags |= SB_UPCALL; 424 } 425 426 static void 427 gre_upcall_remove(struct socket *so) 428 { 429 so->so_rcv.sb_flags &= ~SB_UPCALL; 430 so->so_upcallarg = NULL; 431 so->so_upcall = NULL; 432 } 433 434 static int 435 gre_socreate(struct gre_softc *sc, const struct gre_soparm *sp, int *fdout) 436 { 437 int fd, rc; 438 file_t *fp; 439 struct socket *so; 440 struct sockaddr_big sbig; 441 sa_family_t af; 442 int val; 443 444 GRE_DPRINTF(sc, "enter\n"); 445 446 af = sp->sp_src.ss_family; 447 rc = fsocreate(af, &so, sp->sp_type, sp->sp_proto, &fd, &fp, NULL); 448 if (rc != 0) { 449 GRE_DPRINTF(sc, "fsocreate failed\n"); 450 return rc; 451 } 452 453 memcpy(&sbig, &sp->sp_src, sizeof(sp->sp_src)); 454 if ((rc = sobind(so, (struct sockaddr *)&sbig, curlwp)) != 0) { 455 GRE_DPRINTF(sc, "sobind failed\n"); 456 goto out; 457 } 458 459 memcpy(&sbig, &sp->sp_dst, sizeof(sp->sp_dst)); 460 solock(so); 461 if ((rc = soconnect(so, (struct sockaddr *)&sbig, curlwp)) != 0) { 462 GRE_DPRINTF(sc, "soconnect failed\n"); 463 sounlock(so); 464 goto out; 465 } 466 sounlock(so); 467 468 /* XXX convert to a (new) SOL_SOCKET call */ 469 KASSERT(so->so_proto != NULL); 470 rc = so_setsockopt(curlwp, so, IPPROTO_IP, IP_TTL, 471 &ip_gre_ttl, sizeof(ip_gre_ttl)); 472 if (rc != 0) { 473 GRE_DPRINTF(sc, "so_setsockopt ttl failed\n"); 474 rc = 0; 475 } 476 477 val = 1; 478 rc = so_setsockopt(curlwp, so, SOL_SOCKET, SO_NOHEADER, 479 &val, sizeof(val)); 480 if (rc != 0) { 481 GRE_DPRINTF(sc, "so_setsockopt SO_NOHEADER failed\n"); 482 rc = 0; 483 } 484 out: 485 if (rc != 0) { 486 soclose(so); 487 fd_abort(curproc, fp, fd); 488 } else { 489 fd_affix(curproc, fp, fd); 490 *fdout = fd; 491 } 492 493 return rc; 494 } 495 496 static int 497 gre_sosend(struct socket *so, struct mbuf *top) 498 { 499 struct proc *p; 500 long space, resid; 501 int error; 502 struct lwp * const l = curlwp; 503 504 p = l->l_proc; 505 506 resid = top->m_pkthdr.len; 507 if (p) 508 l->l_ru.ru_msgsnd++; 509 #define snderr(errno) { error = errno; goto release; } 510 511 solock(so); 512 if ((error = sblock(&so->so_snd, M_NOWAIT)) != 0) 513 goto out; 514 if (so->so_state & SS_CANTSENDMORE) 515 snderr(EPIPE); 516 if (so->so_error) { 517 error = so->so_error; 518 so->so_error = 0; 519 goto release; 520 } 521 if ((so->so_state & SS_ISCONNECTED) == 0) { 522 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 523 snderr(ENOTCONN); 524 } else { 525 snderr(EDESTADDRREQ); 526 } 527 } 528 space = sbspace(&so->so_snd); 529 if (resid > so->so_snd.sb_hiwat) 530 snderr(EMSGSIZE); 531 if (space < resid) 532 snderr(EWOULDBLOCK); 533 /* 534 * Data is prepackaged in "top". 535 */ 536 if (so->so_state & SS_CANTSENDMORE) 537 snderr(EPIPE); 538 error = (*so->so_proto->pr_usrreqs->pr_send)(so, 539 top, NULL, NULL, l); 540 top = NULL; 541 release: 542 sbunlock(&so->so_snd); 543 out: 544 sounlock(so); 545 if (top != NULL) 546 m_freem(top); 547 return error; 548 } 549 550 /* This is a stripped-down version of soreceive() that will never 551 * block. It will support SOCK_DGRAM sockets. It may also support 552 * SOCK_SEQPACKET sockets. 553 */ 554 static int 555 gre_soreceive(struct socket *so, struct mbuf **mp0) 556 { 557 struct mbuf *m, **mp; 558 int flags, len, error, type; 559 const struct protosw *pr; 560 struct mbuf *nextrecord; 561 562 KASSERT(mp0 != NULL); 563 564 flags = MSG_DONTWAIT; 565 pr = so->so_proto; 566 mp = mp0; 567 type = 0; 568 569 *mp = NULL; 570 571 KASSERT(pr->pr_flags & PR_ATOMIC); 572 restart: 573 if ((error = sblock(&so->so_rcv, M_NOWAIT)) != 0) { 574 return error; 575 } 576 m = so->so_rcv.sb_mb; 577 /* 578 * If we have less data than requested, do not block awaiting more. 579 */ 580 if (m == NULL) { 581 #ifdef DIAGNOSTIC 582 if (so->so_rcv.sb_cc) 583 panic("receive 1"); 584 #endif 585 if (so->so_error) { 586 error = so->so_error; 587 so->so_error = 0; 588 } else if (so->so_state & SS_CANTRCVMORE) 589 ; 590 else if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 591 && (so->so_proto->pr_flags & PR_CONNREQUIRED)) 592 error = ENOTCONN; 593 else 594 error = EWOULDBLOCK; 595 goto release; 596 } 597 /* 598 * On entry here, m points to the first record of the socket buffer. 599 * While we process the initial mbufs containing address and control 600 * info, we save a copy of m->m_nextpkt into nextrecord. 601 */ 602 if (curlwp != NULL) 603 curlwp->l_ru.ru_msgrcv++; 604 KASSERT(m == so->so_rcv.sb_mb); 605 SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); 606 SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); 607 nextrecord = m->m_nextpkt; 608 if (pr->pr_flags & PR_ADDR) { 609 #ifdef DIAGNOSTIC 610 if (m->m_type != MT_SONAME) 611 panic("receive 1a"); 612 #endif 613 sbfree(&so->so_rcv, m); 614 m = so->so_rcv.sb_mb = m_free(m); 615 } 616 while (m != NULL && m->m_type == MT_CONTROL && error == 0) { 617 sbfree(&so->so_rcv, m); 618 /* 619 * Dispose of any SCM_RIGHTS message that went 620 * through the read path rather than recv. 621 */ 622 if (pr->pr_domain->dom_dispose && 623 mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) 624 (*pr->pr_domain->dom_dispose)(m); 625 m = so->so_rcv.sb_mb = m_free(m); 626 } 627 628 /* 629 * If m is non-NULL, we have some data to read. From now on, 630 * make sure to keep sb_lastrecord consistent when working on 631 * the last packet on the chain (nextrecord == NULL) and we 632 * change m->m_nextpkt. 633 */ 634 if (m != NULL) { 635 m->m_nextpkt = nextrecord; 636 /* 637 * If nextrecord == NULL (this is a single chain), 638 * then sb_lastrecord may not be valid here if m 639 * was changed earlier. 640 */ 641 if (nextrecord == NULL) { 642 KASSERT(so->so_rcv.sb_mb == m); 643 so->so_rcv.sb_lastrecord = m; 644 } 645 type = m->m_type; 646 if (type == MT_OOBDATA) 647 flags |= MSG_OOB; 648 } else { 649 KASSERT(so->so_rcv.sb_mb == m); 650 so->so_rcv.sb_mb = nextrecord; 651 SB_EMPTY_FIXUP(&so->so_rcv); 652 } 653 SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); 654 SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); 655 656 while (m != NULL) { 657 if (m->m_type == MT_OOBDATA) { 658 if (type != MT_OOBDATA) 659 break; 660 } else if (type == MT_OOBDATA) 661 break; 662 #ifdef DIAGNOSTIC 663 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 664 panic("receive 3"); 665 #endif 666 so->so_state &= ~SS_RCVATMARK; 667 if (so->so_oobmark != 0 && so->so_oobmark < m->m_len) 668 break; 669 len = m->m_len; 670 /* 671 * mp is set, just pass back the mbufs. 672 * Sockbuf must be consistent here (points to current mbuf, 673 * it points to next record) when we drop priority; 674 * we must note any additions to the sockbuf when we 675 * block interrupts again. 676 */ 677 if (m->m_flags & M_EOR) 678 flags |= MSG_EOR; 679 nextrecord = m->m_nextpkt; 680 sbfree(&so->so_rcv, m); 681 *mp = m; 682 mp = &m->m_next; 683 so->so_rcv.sb_mb = m = m->m_next; 684 *mp = NULL; 685 /* 686 * If m != NULL, we also know that 687 * so->so_rcv.sb_mb != NULL. 688 */ 689 KASSERT(so->so_rcv.sb_mb == m); 690 if (m) { 691 m->m_nextpkt = nextrecord; 692 if (nextrecord == NULL) 693 so->so_rcv.sb_lastrecord = m; 694 } else { 695 so->so_rcv.sb_mb = nextrecord; 696 SB_EMPTY_FIXUP(&so->so_rcv); 697 } 698 SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); 699 SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); 700 if (so->so_oobmark) { 701 so->so_oobmark -= len; 702 if (so->so_oobmark == 0) { 703 so->so_state |= SS_RCVATMARK; 704 break; 705 } 706 } 707 if (flags & MSG_EOR) 708 break; 709 } 710 711 if (m != NULL) { 712 m_freem(*mp); 713 *mp = NULL; 714 error = ENOMEM; 715 (void) sbdroprecord(&so->so_rcv); 716 } else { 717 /* 718 * First part is an inline SB_EMPTY_FIXUP(). Second 719 * part makes sure sb_lastrecord is up-to-date if 720 * there is still data in the socket buffer. 721 */ 722 so->so_rcv.sb_mb = nextrecord; 723 if (so->so_rcv.sb_mb == NULL) { 724 so->so_rcv.sb_mbtail = NULL; 725 so->so_rcv.sb_lastrecord = NULL; 726 } else if (nextrecord->m_nextpkt == NULL) 727 so->so_rcv.sb_lastrecord = nextrecord; 728 } 729 SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); 730 SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); 731 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 732 (*pr->pr_usrreqs->pr_rcvd)(so, flags, curlwp); 733 if (*mp0 == NULL && (flags & MSG_EOR) == 0 && 734 (so->so_state & SS_CANTRCVMORE) == 0) { 735 sbunlock(&so->so_rcv); 736 goto restart; 737 } 738 739 release: 740 sbunlock(&so->so_rcv); 741 return error; 742 } 743 744 static struct socket * 745 gre_reconf(struct gre_softc *sc, const struct gre_soparm *newsoparm) 746 { 747 struct ifnet *ifp = &sc->sc_if; 748 749 GRE_DPRINTF(sc, "enter\n"); 750 751 shutdown: 752 if (sc->sc_soparm.sp_so != NULL) { 753 GRE_DPRINTF(sc, "\n"); 754 gre_upcall_remove(sc->sc_soparm.sp_so); 755 softint_disestablish(sc->sc_si); 756 sc->sc_si = NULL; 757 gre_fp_send(sc, GRE_M_DELFP, NULL); 758 gre_clearconf(&sc->sc_soparm, false); 759 } 760 761 if (newsoparm != NULL) { 762 GRE_DPRINTF(sc, "\n"); 763 sc->sc_soparm = *newsoparm; 764 newsoparm = NULL; 765 } 766 767 if (sc->sc_soparm.sp_so != NULL) { 768 GRE_DPRINTF(sc, "\n"); 769 sc->sc_si = softint_establish(SOFTINT_NET, greintr, sc); 770 gre_upcall_add(sc->sc_soparm.sp_so, sc); 771 if ((ifp->if_flags & IFF_UP) == 0) { 772 GRE_DPRINTF(sc, "down\n"); 773 goto shutdown; 774 } 775 } 776 777 GRE_DPRINTF(sc, "\n"); 778 if (sc->sc_soparm.sp_so != NULL) 779 sc->sc_if.if_flags |= IFF_RUNNING; 780 else { 781 gre_bufq_purge(&sc->sc_snd); 782 sc->sc_if.if_flags &= ~IFF_RUNNING; 783 } 784 return sc->sc_soparm.sp_so; 785 } 786 787 static int 788 gre_input(struct gre_softc *sc, struct mbuf *m, const struct gre_h *gh) 789 { 790 pktqueue_t *pktq = NULL; 791 uint16_t flags; 792 uint32_t af; /* af passed to BPF tap */ 793 int hlen; 794 795 if_statadd2(&sc->sc_if, if_ipackets, 1, if_ibytes, m->m_pkthdr.len); 796 797 hlen = sizeof(struct gre_h); 798 799 /* process GRE flags as packet can be of variable len */ 800 flags = ntohs(gh->flags); 801 802 /* Checksum & Offset are present */ 803 if ((flags & GRE_CP) | (flags & GRE_RP)) 804 hlen += 4; 805 /* We don't support routing fields (variable length) */ 806 if (flags & GRE_RP) { 807 if_statinc(&sc->sc_if, if_ierrors); 808 return 0; 809 } 810 if (flags & GRE_KP) 811 hlen += 4; 812 if (flags & GRE_SP) 813 hlen += 4; 814 815 switch (ntohs(gh->ptype)) { /* ethertypes */ 816 #ifdef INET 817 case ETHERTYPE_IP: 818 pktq = ip_pktq; 819 af = AF_INET; 820 break; 821 #endif 822 #ifdef NETATALK 823 case ETHERTYPE_ATALK: 824 pktq = at_pktq1; 825 af = AF_APPLETALK; 826 break; 827 #endif 828 #ifdef INET6 829 case ETHERTYPE_IPV6: 830 pktq = ip6_pktq; 831 af = AF_INET6; 832 break; 833 #endif 834 #ifdef MPLS 835 case ETHERTYPE_MPLS: 836 pktq = mpls_pktq; 837 af = AF_MPLS; 838 break; 839 #endif 840 default: /* others not yet supported */ 841 GRE_DPRINTF(sc, "unhandled ethertype 0x%04x\n", 842 ntohs(gh->ptype)); 843 if_statinc(&sc->sc_if, if_noproto); 844 return 0; 845 } 846 847 if (hlen > m->m_pkthdr.len) { 848 m_freem(m); 849 if_statinc(&sc->sc_if, if_ierrors); 850 return 1; 851 } 852 m_adj(m, hlen); 853 854 bpf_mtap_af(&sc->sc_if, af, m, BPF_D_IN); 855 856 m_set_rcvif(m, &sc->sc_if); 857 858 KASSERT(pktq != NULL); 859 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 860 m_freem(m); 861 } 862 return 1; /* packet is done, no further processing needed */ 863 } 864 865 /* 866 * The output routine. Takes a packet and encapsulates it in the protocol 867 * given by sc->sc_soparm.sp_proto. See also RFC 1701 and RFC 2004 868 */ 869 static int 870 gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 871 const struct rtentry *rt) 872 { 873 int error = 0; 874 struct gre_softc *sc = ifp->if_softc; 875 struct gre_h gh = { .flags = 0 }; 876 uint16_t etype = 0; 877 878 KASSERT((m->m_flags & M_PKTHDR) != 0); 879 880 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 881 m_freem(m); 882 error = ENETDOWN; 883 goto end; 884 } 885 886 bpf_mtap_af(ifp, dst->sa_family, m, BPF_D_OUT); 887 888 m->m_flags &= ~(M_BCAST|M_MCAST); 889 890 GRE_DPRINTF(sc, "dst->sa_family=%d\n", dst->sa_family); 891 switch (dst->sa_family) { 892 #ifdef INET 893 case AF_INET: 894 /* 895 * TBD Extract the IP ToS field and set the 896 * encapsulating protocol's ToS to suit. 897 */ 898 etype = htons(ETHERTYPE_IP); 899 break; 900 #endif 901 #ifdef NETATALK 902 case AF_APPLETALK: 903 etype = htons(ETHERTYPE_ATALK); 904 break; 905 #endif 906 #ifdef INET6 907 case AF_INET6: 908 etype = htons(ETHERTYPE_IPV6); 909 break; 910 #endif 911 default: 912 IF_DROP(&ifp->if_snd); 913 m_freem(m); 914 error = EAFNOSUPPORT; 915 goto end; 916 } 917 918 #ifdef MPLS 919 if (rt != NULL && rt_gettag(rt) != NULL) { 920 union mpls_shim msh; 921 msh.s_addr = MPLS_GETSADDR(rt); 922 if (msh.shim.label != MPLS_LABEL_IMPLNULL) 923 etype = htons(ETHERTYPE_MPLS); 924 } 925 #endif 926 927 M_PREPEND(m, sizeof(gh), M_DONTWAIT); 928 if (m == NULL) { 929 IF_DROP(&ifp->if_snd); 930 error = ENOBUFS; 931 goto end; 932 } 933 934 gh.ptype = etype; 935 memcpy(mtod(m, void *), &gh, sizeof(gh)); 936 /* XXX Need to handle IP ToS. Look at how I handle IP TTL. */ 937 938 if_statadd2(ifp, if_opackets, 1, if_obytes, m->m_pkthdr.len); 939 940 /* Clear checksum-offload flags. */ 941 m->m_pkthdr.csum_flags = 0; 942 m->m_pkthdr.csum_data = 0; 943 944 /* send it off */ 945 if ((error = gre_bufq_enqueue(&sc->sc_snd, m)) != 0) { 946 sc->sc_oflow_ev.ev_count++; 947 m_freem(m); 948 } else { 949 kpreempt_disable(); 950 softint_schedule(sc->sc_si); 951 kpreempt_enable(); 952 } 953 954 end: 955 if (error) 956 if_statinc(ifp, if_oerrors); 957 return error; 958 } 959 960 static int 961 gre_getsockname(struct socket *so, struct sockaddr *nam) 962 { 963 return (*so->so_proto->pr_usrreqs->pr_sockaddr)(so, nam); 964 } 965 966 static int 967 gre_getpeername(struct socket *so, struct sockaddr *nam) 968 { 969 return (*so->so_proto->pr_usrreqs->pr_peeraddr)(so, nam); 970 } 971 972 static int 973 gre_getnames(struct socket *so, struct lwp *l, struct sockaddr_storage *src, 974 struct sockaddr_storage *dst) 975 { 976 struct sockaddr_storage ss; 977 int rc; 978 979 solock(so); 980 if ((rc = gre_getsockname(so, (struct sockaddr *)&ss)) != 0) 981 goto out; 982 *src = ss; 983 984 if ((rc = gre_getpeername(so, (struct sockaddr *)&ss)) != 0) 985 goto out; 986 *dst = ss; 987 out: 988 sounlock(so); 989 return rc; 990 } 991 992 static void 993 gre_fp_recvloop(void *arg) 994 { 995 struct gre_softc *sc = arg; 996 997 mutex_enter(&sc->sc_mtx); 998 while (gre_fp_recv(sc)) 999 ; 1000 mutex_exit(&sc->sc_mtx); 1001 kthread_exit(0); 1002 } 1003 1004 static bool 1005 gre_fp_recv(struct gre_softc *sc) 1006 { 1007 int fd, ofd, rc; 1008 file_t *fp; 1009 1010 fp = sc->sc_fp; 1011 ofd = sc->sc_fd; 1012 fd = -1; 1013 1014 switch (sc->sc_msg) { 1015 case GRE_M_STOP: 1016 cv_signal(&sc->sc_fp_condvar); 1017 return false; 1018 case GRE_M_SETFP: 1019 mutex_exit(&sc->sc_mtx); 1020 rc = fd_dup(fp, 0, &fd, 0); 1021 mutex_enter(&sc->sc_mtx); 1022 if (rc != 0) { 1023 sc->sc_msg = GRE_M_ERR; 1024 break; 1025 } 1026 /*FALLTHROUGH*/ 1027 case GRE_M_DELFP: 1028 mutex_exit(&sc->sc_mtx); 1029 if (ofd != -1 && fd_getfile(ofd) != NULL) 1030 fd_close(ofd); 1031 mutex_enter(&sc->sc_mtx); 1032 sc->sc_fd = fd; 1033 sc->sc_msg = GRE_M_OK; 1034 break; 1035 default: 1036 gre_fp_wait(sc); 1037 return true; 1038 } 1039 cv_signal(&sc->sc_fp_condvar); 1040 return true; 1041 } 1042 1043 static bool 1044 gre_fp_send(struct gre_softc *sc, enum gre_msg msg, file_t *fp) 1045 { 1046 bool rc; 1047 1048 mutex_enter(&sc->sc_mtx); 1049 while (sc->sc_msg != GRE_M_NONE) 1050 gre_fp_wait(sc); 1051 sc->sc_fp = fp; 1052 sc->sc_msg = msg; 1053 cv_signal(&sc->sc_fp_condvar); 1054 while (sc->sc_msg != GRE_M_STOP && sc->sc_msg != GRE_M_OK && 1055 sc->sc_msg != GRE_M_ERR) 1056 gre_fp_wait(sc); 1057 rc = (sc->sc_msg != GRE_M_ERR); 1058 sc->sc_msg = GRE_M_NONE; 1059 cv_signal(&sc->sc_fp_condvar); 1060 mutex_exit(&sc->sc_mtx); 1061 return rc; 1062 } 1063 1064 static int 1065 gre_ssock(struct ifnet *ifp, struct gre_soparm *sp, int fd) 1066 { 1067 int error = 0; 1068 const struct protosw *pr; 1069 file_t *fp; 1070 struct gre_softc *sc = ifp->if_softc; 1071 struct socket *so; 1072 struct sockaddr_storage dst, src; 1073 1074 if ((fp = fd_getfile(fd)) == NULL) 1075 return EBADF; 1076 if (fp->f_type != DTYPE_SOCKET) { 1077 fd_putfile(fd); 1078 return ENOTSOCK; 1079 } 1080 1081 GRE_DPRINTF(sc, "\n"); 1082 1083 so = fp->f_socket; 1084 pr = so->so_proto; 1085 1086 GRE_DPRINTF(sc, "type %d, proto %d\n", pr->pr_type, pr->pr_protocol); 1087 1088 if ((pr->pr_flags & PR_ATOMIC) == 0 || 1089 (sp->sp_type != 0 && pr->pr_type != sp->sp_type) || 1090 (sp->sp_proto != 0 && pr->pr_protocol != 0 && 1091 pr->pr_protocol != sp->sp_proto)) { 1092 error = EINVAL; 1093 goto err; 1094 } 1095 1096 GRE_DPRINTF(sc, "\n"); 1097 1098 /* check address */ 1099 if ((error = gre_getnames(so, curlwp, &src, &dst)) != 0) 1100 goto err; 1101 1102 GRE_DPRINTF(sc, "\n"); 1103 1104 if (!gre_fp_send(sc, GRE_M_SETFP, fp)) { 1105 error = EBUSY; 1106 goto err; 1107 } 1108 1109 GRE_DPRINTF(sc, "\n"); 1110 1111 sp->sp_src = src; 1112 sp->sp_dst = dst; 1113 1114 sp->sp_so = so; 1115 1116 err: 1117 fd_putfile(fd); 1118 return error; 1119 } 1120 1121 static bool 1122 sockaddr_is_anyaddr(const struct sockaddr *sa) 1123 { 1124 socklen_t anylen, salen; 1125 const void *anyaddr, *addr; 1126 1127 if ((anyaddr = sockaddr_anyaddr(sa, &anylen)) == NULL || 1128 (addr = sockaddr_const_addr(sa, &salen)) == NULL) 1129 return false; 1130 1131 if (salen > anylen) 1132 return false; 1133 1134 return memcmp(anyaddr, addr, MIN(anylen, salen)) == 0; 1135 } 1136 1137 static bool 1138 gre_is_nullconf(const struct gre_soparm *sp) 1139 { 1140 return sockaddr_is_anyaddr(sstocsa(&sp->sp_src)) || 1141 sockaddr_is_anyaddr(sstocsa(&sp->sp_dst)); 1142 } 1143 1144 static void 1145 gre_clearconf(struct gre_soparm *sp, bool force) 1146 { 1147 if (sp->sp_bysock || force) { 1148 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1149 sockaddr_any(sstosa(&sp->sp_src))); 1150 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1151 sockaddr_any(sstosa(&sp->sp_dst))); 1152 sp->sp_bysock = false; 1153 } 1154 sp->sp_so = NULL; /* XXX */ 1155 } 1156 1157 static int 1158 gre_ioctl(struct ifnet *ifp, const u_long cmd, void *data) 1159 { 1160 struct ifreq *ifr; 1161 struct ifaddr *ifa = (struct ifaddr *)data; 1162 struct if_laddrreq *lifr = (struct if_laddrreq *)data; 1163 struct gre_softc *sc = ifp->if_softc; 1164 struct gre_soparm *sp; 1165 int fd, error = 0, oproto, otype, s; 1166 struct gre_soparm sp0; 1167 1168 ifr = data; 1169 1170 GRE_DPRINTF(sc, "cmd %lu\n", cmd); 1171 1172 switch (cmd) { 1173 case GRESPROTO: 1174 case GRESADDRD: 1175 case GRESADDRS: 1176 case GRESSOCK: 1177 case GREDSOCK: 1178 if (kauth_authorize_network(kauth_cred_get(), 1179 KAUTH_NETWORK_INTERFACE, 1180 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1181 NULL) != 0) 1182 return EPERM; 1183 break; 1184 default: 1185 break; 1186 } 1187 1188 s = splnet(); 1189 1190 sp0 = sc->sc_soparm; 1191 sp0.sp_so = NULL; 1192 sp = &sp0; 1193 1194 GRE_DPRINTF(sc, "\n"); 1195 1196 switch (cmd) { 1197 case SIOCINITIFADDR: 1198 GRE_DPRINTF(sc, "\n"); 1199 if ((ifp->if_flags & IFF_UP) != 0) 1200 break; 1201 gre_clearconf(sp, false); 1202 ifp->if_flags |= IFF_UP; 1203 ifa->ifa_rtrequest = p2p_rtrequest; 1204 goto mksocket; 1205 case SIOCSIFFLAGS: 1206 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1207 break; 1208 oproto = sp->sp_proto; 1209 otype = sp->sp_type; 1210 switch (ifr->ifr_flags & (IFF_LINK0|IFF_LINK2)) { 1211 case IFF_LINK0|IFF_LINK2: 1212 sp->sp_proto = IPPROTO_UDP; 1213 sp->sp_type = SOCK_DGRAM; 1214 break; 1215 case IFF_LINK2: 1216 sp->sp_proto = 0; 1217 sp->sp_type = 0; 1218 break; 1219 case IFF_LINK0: 1220 sp->sp_proto = IPPROTO_GRE; 1221 sp->sp_type = SOCK_RAW; 1222 break; 1223 default: 1224 GRE_DPRINTF(sc, "\n"); 1225 error = EINVAL; 1226 goto out; 1227 } 1228 GRE_DPRINTF(sc, "\n"); 1229 gre_clearconf(sp, false); 1230 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == 1231 (IFF_UP|IFF_RUNNING) && 1232 (oproto == sp->sp_proto || sp->sp_proto == 0) && 1233 (otype == sp->sp_type || sp->sp_type == 0)) 1234 break; 1235 switch (sp->sp_proto) { 1236 case IPPROTO_UDP: 1237 case IPPROTO_GRE: 1238 goto mksocket; 1239 default: 1240 break; 1241 } 1242 break; 1243 case SIOCSIFMTU: 1244 /* XXX determine MTU automatically by probing w/ 1245 * XXX do-not-fragment packets? 1246 */ 1247 if (ifr->ifr_mtu < 576) { 1248 error = EINVAL; 1249 break; 1250 } 1251 /*FALLTHROUGH*/ 1252 case SIOCGIFMTU: 1253 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1254 error = 0; 1255 break; 1256 case SIOCADDMULTI: 1257 case SIOCDELMULTI: 1258 if (ifr == NULL) { 1259 error = EAFNOSUPPORT; 1260 break; 1261 } 1262 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 1263 #ifdef INET 1264 case AF_INET: 1265 break; 1266 #endif 1267 #ifdef INET6 1268 case AF_INET6: 1269 break; 1270 #endif 1271 default: 1272 error = EAFNOSUPPORT; 1273 break; 1274 } 1275 break; 1276 case GRESPROTO: 1277 gre_clearconf(sp, false); 1278 oproto = sp->sp_proto; 1279 otype = sp->sp_type; 1280 sp->sp_proto = ifr->ifr_flags; 1281 switch (sp->sp_proto) { 1282 case IPPROTO_UDP: 1283 ifp->if_flags |= IFF_LINK0|IFF_LINK2; 1284 sp->sp_type = SOCK_DGRAM; 1285 break; 1286 case IPPROTO_GRE: 1287 ifp->if_flags |= IFF_LINK0; 1288 ifp->if_flags &= ~IFF_LINK2; 1289 sp->sp_type = SOCK_RAW; 1290 break; 1291 case 0: 1292 ifp->if_flags &= ~IFF_LINK0; 1293 ifp->if_flags |= IFF_LINK2; 1294 sp->sp_type = 0; 1295 break; 1296 default: 1297 error = EPROTONOSUPPORT; 1298 break; 1299 } 1300 if ((oproto == sp->sp_proto || sp->sp_proto == 0) && 1301 (otype == sp->sp_type || sp->sp_type == 0)) 1302 break; 1303 switch (sp->sp_proto) { 1304 case IPPROTO_UDP: 1305 case IPPROTO_GRE: 1306 goto mksocket; 1307 default: 1308 break; 1309 } 1310 break; 1311 case GREGPROTO: 1312 ifr->ifr_flags = sp->sp_proto; 1313 break; 1314 case GRESADDRS: 1315 case GRESADDRD: 1316 gre_clearconf(sp, false); 1317 /* set tunnel endpoints and mark interface as up */ 1318 switch (cmd) { 1319 case GRESADDRS: 1320 sockaddr_copy(sstosa(&sp->sp_src), 1321 sizeof(sp->sp_src), ifreq_getaddr(cmd, ifr)); 1322 break; 1323 case GRESADDRD: 1324 sockaddr_copy(sstosa(&sp->sp_dst), 1325 sizeof(sp->sp_dst), ifreq_getaddr(cmd, ifr)); 1326 break; 1327 } 1328 checkaddr: 1329 if (sockaddr_any(sstosa(&sp->sp_src)) == NULL || 1330 sockaddr_any(sstosa(&sp->sp_dst)) == NULL) { 1331 error = EINVAL; 1332 break; 1333 } 1334 /* let gre_socreate() check the rest */ 1335 mksocket: 1336 GRE_DPRINTF(sc, "\n"); 1337 /* If we're administratively down, or the configuration 1338 * is empty, there's no use creating a socket. 1339 */ 1340 if ((ifp->if_flags & IFF_UP) == 0 || gre_is_nullconf(sp)) 1341 goto sendconf; 1342 1343 GRE_DPRINTF(sc, "\n"); 1344 fd = 0; 1345 error = gre_socreate(sc, sp, &fd); 1346 if (error != 0) 1347 break; 1348 1349 setsock: 1350 GRE_DPRINTF(sc, "\n"); 1351 1352 error = gre_ssock(ifp, sp, fd); 1353 1354 if (cmd != GRESSOCK) { 1355 GRE_DPRINTF(sc, "\n"); 1356 /* XXX v. dodgy */ 1357 if (fd_getfile(fd) != NULL) 1358 fd_close(fd); 1359 } 1360 1361 if (error == 0) { 1362 sendconf: 1363 GRE_DPRINTF(sc, "\n"); 1364 ifp->if_flags &= ~IFF_RUNNING; 1365 gre_reconf(sc, sp); 1366 } 1367 1368 break; 1369 case GREGADDRS: 1370 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_src)); 1371 break; 1372 case GREGADDRD: 1373 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_dst)); 1374 break; 1375 case GREDSOCK: 1376 GRE_DPRINTF(sc, "\n"); 1377 if (sp->sp_bysock) 1378 ifp->if_flags &= ~IFF_UP; 1379 gre_clearconf(sp, false); 1380 goto mksocket; 1381 case GRESSOCK: 1382 GRE_DPRINTF(sc, "\n"); 1383 gre_clearconf(sp, true); 1384 fd = (int)ifr->ifr_value; 1385 sp->sp_bysock = true; 1386 ifp->if_flags |= IFF_UP; 1387 goto setsock; 1388 case SIOCSLIFPHYADDR: 1389 GRE_DPRINTF(sc, "\n"); 1390 if (lifr->addr.ss_family != lifr->dstaddr.ss_family) { 1391 error = EAFNOSUPPORT; 1392 break; 1393 } 1394 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1395 sstosa(&lifr->addr)); 1396 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1397 sstosa(&lifr->dstaddr)); 1398 GRE_DPRINTF(sc, "\n"); 1399 goto checkaddr; 1400 case SIOCDIFPHYADDR: 1401 GRE_DPRINTF(sc, "\n"); 1402 gre_clearconf(sp, true); 1403 ifp->if_flags &= ~IFF_UP; 1404 goto mksocket; 1405 case SIOCGLIFPHYADDR: 1406 GRE_DPRINTF(sc, "\n"); 1407 if (gre_is_nullconf(sp)) { 1408 error = EADDRNOTAVAIL; 1409 break; 1410 } 1411 sockaddr_copy(sstosa(&lifr->addr), sizeof(lifr->addr), 1412 sstosa(&sp->sp_src)); 1413 sockaddr_copy(sstosa(&lifr->dstaddr), sizeof(lifr->dstaddr), 1414 sstosa(&sp->sp_dst)); 1415 GRE_DPRINTF(sc, "\n"); 1416 break; 1417 default: 1418 error = ifioctl_common(ifp, cmd, data); 1419 break; 1420 } 1421 out: 1422 GRE_DPRINTF(sc, "\n"); 1423 splx(s); 1424 return error; 1425 } 1426 1427 /* ARGSUSED */ 1428 void 1429 greattach(int count) 1430 { 1431 1432 /* 1433 * Nothing to do here, initialization is handled by the 1434 * module initialization code in greinit() below. 1435 */ 1436 } 1437 1438 static void 1439 greinit(void) 1440 { 1441 if_clone_attach(&gre_cloner); 1442 } 1443 1444 static int 1445 gredetach(void) 1446 { 1447 int error = 0; 1448 1449 if (gre_count != 0) 1450 error = EBUSY; 1451 1452 if (error == 0) 1453 if_clone_detach(&gre_cloner); 1454 1455 return error; 1456 } 1457 1458 /* 1459 * Module infrastructure 1460 */ 1461 #include "if_module.h" 1462 1463 IF_MODULE(MODULE_CLASS_DRIVER, gre, NULL) 1464