if_gre.c revision 1.149.2.2
1 /* $NetBSD: if_gre.c,v 1.149.2.2 2014/05/22 11:41:09 yamt 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 (at) pilhuhn.de> 9 * 10 * IPv6-over-GRE contributed by Gert Doering <gert (at) greenie.muc.de> 11 * 12 * GRE over UDP/IPv4/IPv6 sockets contributed by David Young <dyoung (at) 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 1.149.2.2 2014/05/22 11:41:09 yamt Exp $"); 49 50 #include "opt_atalk.h" 51 #include "opt_gre.h" 52 #include "opt_inet.h" 53 #include "opt_mpls.h" 54 55 #include <sys/param.h> 56 #include <sys/file.h> 57 #include <sys/filedesc.h> 58 #include <sys/malloc.h> 59 #include <sys/mallocvar.h> 60 #include <sys/mbuf.h> 61 #include <sys/proc.h> 62 #include <sys/domain.h> 63 #include <sys/protosw.h> 64 #include <sys/socket.h> 65 #include <sys/socketvar.h> 66 #include <sys/ioctl.h> 67 #include <sys/queue.h> 68 #include <sys/intr.h> 69 #include <sys/systm.h> 70 #include <sys/sysctl.h> 71 #include <sys/kauth.h> 72 73 #include <sys/kernel.h> 74 #include <sys/mutex.h> 75 #include <sys/condvar.h> 76 #include <sys/kthread.h> 77 78 #include <sys/cpu.h> 79 80 #include <net/ethertypes.h> 81 #include <net/if.h> 82 #include <net/if_types.h> 83 #include <net/netisr.h> 84 #include <net/route.h> 85 86 #include <netinet/in_systm.h> 87 #include <netinet/in.h> 88 #include <netinet/ip.h> /* we always need this for sizeof(struct ip) */ 89 90 #ifdef INET 91 #include <netinet/in_var.h> 92 #include <netinet/ip_var.h> 93 #endif 94 95 #ifdef INET6 96 #include <netinet6/in6_var.h> 97 #endif 98 99 #ifdef MPLS 100 #include <netmpls/mpls.h> 101 #include <netmpls/mpls_var.h> 102 #endif 103 104 #ifdef NETATALK 105 #include <netatalk/at.h> 106 #include <netatalk/at_var.h> 107 #include <netatalk/at_extern.h> 108 #endif 109 110 #include <sys/time.h> 111 #include <net/bpf.h> 112 113 #include <net/if_gre.h> 114 115 #include <compat/sys/socket.h> 116 #include <compat/sys/sockio.h> 117 /* 118 * It is not easy to calculate the right value for a GRE MTU. 119 * We leave this task to the admin and use the same default that 120 * other vendors use. 121 */ 122 #define GREMTU 1476 123 124 #ifdef GRE_DEBUG 125 int gre_debug = 0; 126 #define GRE_DPRINTF(__sc, ...) \ 127 do { \ 128 if (__predict_false(gre_debug || \ 129 ((__sc)->sc_if.if_flags & IFF_DEBUG) != 0)) { \ 130 printf("%s.%d: ", __func__, __LINE__); \ 131 printf(__VA_ARGS__); \ 132 } \ 133 } while (/*CONSTCOND*/0) 134 #else 135 #define GRE_DPRINTF(__sc, __fmt, ...) do { } while (/*CONSTCOND*/0) 136 #endif /* GRE_DEBUG */ 137 138 int ip_gre_ttl = GRE_TTL; 139 140 static int gre_clone_create(struct if_clone *, int); 141 static int gre_clone_destroy(struct ifnet *); 142 143 static struct if_clone gre_cloner = 144 IF_CLONE_INITIALIZER("gre", gre_clone_create, gre_clone_destroy); 145 146 static int gre_input(struct gre_softc *, struct mbuf *, int, 147 const struct gre_h *); 148 static bool gre_is_nullconf(const struct gre_soparm *); 149 static int gre_output(struct ifnet *, struct mbuf *, 150 const struct sockaddr *, struct rtentry *); 151 static int gre_ioctl(struct ifnet *, u_long, void *); 152 static int gre_getsockname(struct socket *, struct mbuf *, struct lwp *); 153 static int gre_getpeername(struct socket *, struct mbuf *, struct lwp *); 154 static int gre_getnames(struct socket *, struct lwp *, 155 struct sockaddr_storage *, struct sockaddr_storage *); 156 static void gre_clearconf(struct gre_soparm *, bool); 157 static int gre_soreceive(struct socket *, struct mbuf **); 158 static int gre_sosend(struct socket *, struct mbuf *); 159 static struct socket *gre_reconf(struct gre_softc *, const struct gre_soparm *); 160 161 static bool gre_fp_send(struct gre_softc *, enum gre_msg, file_t *); 162 static bool gre_fp_recv(struct gre_softc *); 163 static void gre_fp_recvloop(void *); 164 165 static void 166 gre_bufq_init(struct gre_bufq *bq, size_t len0) 167 { 168 memset(bq, 0, sizeof(*bq)); 169 bq->bq_q = pcq_create(len0, KM_SLEEP); 170 KASSERT(bq->bq_q != NULL); 171 } 172 173 static struct mbuf * 174 gre_bufq_dequeue(struct gre_bufq *bq) 175 { 176 return pcq_get(bq->bq_q); 177 } 178 179 static void 180 gre_bufq_purge(struct gre_bufq *bq) 181 { 182 struct mbuf *m; 183 184 while ((m = gre_bufq_dequeue(bq)) != NULL) 185 m_freem(m); 186 } 187 188 static void 189 gre_bufq_destroy(struct gre_bufq *bq) 190 { 191 gre_bufq_purge(bq); 192 pcq_destroy(bq->bq_q); 193 } 194 195 static int 196 gre_bufq_enqueue(struct gre_bufq *bq, struct mbuf *m) 197 { 198 KASSERT(bq->bq_q != NULL); 199 200 if (!pcq_put(bq->bq_q, m)) { 201 bq->bq_drops++; 202 return ENOBUFS; 203 } 204 return 0; 205 } 206 207 static void 208 greintr(void *arg) 209 { 210 struct gre_softc *sc = (struct gre_softc *)arg; 211 struct socket *so = sc->sc_soparm.sp_so; 212 int rc; 213 struct mbuf *m; 214 215 KASSERT(so != NULL); 216 217 sc->sc_send_ev.ev_count++; 218 GRE_DPRINTF(sc, "enter\n"); 219 while ((m = gre_bufq_dequeue(&sc->sc_snd)) != NULL) { 220 /* XXX handle ENOBUFS? */ 221 if ((rc = gre_sosend(so, m)) != 0) 222 GRE_DPRINTF(sc, "gre_sosend failed %d\n", rc); 223 } 224 } 225 226 /* Caller must hold sc->sc_mtx. */ 227 static void 228 gre_fp_wait(struct gre_softc *sc) 229 { 230 sc->sc_fp_waiters++; 231 cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); 232 sc->sc_fp_waiters--; 233 } 234 235 static void 236 gre_evcnt_detach(struct gre_softc *sc) 237 { 238 evcnt_detach(&sc->sc_recv_ev); 239 evcnt_detach(&sc->sc_block_ev); 240 evcnt_detach(&sc->sc_error_ev); 241 evcnt_detach(&sc->sc_pullup_ev); 242 evcnt_detach(&sc->sc_unsupp_ev); 243 244 evcnt_detach(&sc->sc_send_ev); 245 evcnt_detach(&sc->sc_oflow_ev); 246 } 247 248 static void 249 gre_evcnt_attach(struct gre_softc *sc) 250 { 251 evcnt_attach_dynamic(&sc->sc_recv_ev, EVCNT_TYPE_MISC, 252 NULL, sc->sc_if.if_xname, "recv"); 253 evcnt_attach_dynamic(&sc->sc_block_ev, EVCNT_TYPE_MISC, 254 &sc->sc_recv_ev, sc->sc_if.if_xname, "would block"); 255 evcnt_attach_dynamic(&sc->sc_error_ev, EVCNT_TYPE_MISC, 256 &sc->sc_recv_ev, sc->sc_if.if_xname, "error"); 257 evcnt_attach_dynamic(&sc->sc_pullup_ev, EVCNT_TYPE_MISC, 258 &sc->sc_recv_ev, sc->sc_if.if_xname, "pullup failed"); 259 evcnt_attach_dynamic(&sc->sc_unsupp_ev, EVCNT_TYPE_MISC, 260 &sc->sc_recv_ev, sc->sc_if.if_xname, "unsupported"); 261 262 evcnt_attach_dynamic(&sc->sc_send_ev, EVCNT_TYPE_MISC, 263 NULL, sc->sc_if.if_xname, "send"); 264 evcnt_attach_dynamic(&sc->sc_oflow_ev, EVCNT_TYPE_MISC, 265 &sc->sc_send_ev, sc->sc_if.if_xname, "overflow"); 266 } 267 268 static int 269 gre_clone_create(struct if_clone *ifc, int unit) 270 { 271 int rc; 272 struct gre_softc *sc; 273 struct gre_soparm *sp; 274 const struct sockaddr *any; 275 276 if ((any = sockaddr_any_by_family(AF_INET)) == NULL && 277 (any = sockaddr_any_by_family(AF_INET6)) == NULL) 278 return -1; 279 280 sc = malloc(sizeof(*sc), M_DEVBUF, M_WAITOK|M_ZERO); 281 mutex_init(&sc->sc_mtx, MUTEX_DRIVER, IPL_SOFTNET); 282 cv_init(&sc->sc_condvar, "gre wait"); 283 cv_init(&sc->sc_fp_condvar, "gre fp"); 284 285 if_initname(&sc->sc_if, ifc->ifc_name, unit); 286 sc->sc_if.if_softc = sc; 287 sc->sc_if.if_type = IFT_TUNNEL; 288 sc->sc_if.if_addrlen = 0; 289 sc->sc_if.if_hdrlen = sizeof(struct ip) + sizeof(struct gre_h); 290 sc->sc_if.if_dlt = DLT_NULL; 291 sc->sc_if.if_mtu = GREMTU; 292 sc->sc_if.if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 293 sc->sc_if.if_output = gre_output; 294 sc->sc_if.if_ioctl = gre_ioctl; 295 sp = &sc->sc_soparm; 296 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), any); 297 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), any); 298 sp->sp_proto = IPPROTO_GRE; 299 sp->sp_type = SOCK_RAW; 300 301 sc->sc_fd = -1; 302 303 rc = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, gre_fp_recvloop, sc, 304 NULL, "%s", sc->sc_if.if_xname); 305 306 if (rc != 0) 307 return -1; 308 309 gre_evcnt_attach(sc); 310 311 gre_bufq_init(&sc->sc_snd, 17); 312 sc->sc_if.if_flags |= IFF_LINK0; 313 if_attach(&sc->sc_if); 314 if_alloc_sadl(&sc->sc_if); 315 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(uint32_t)); 316 return 0; 317 } 318 319 static int 320 gre_clone_destroy(struct ifnet *ifp) 321 { 322 int s; 323 struct gre_softc *sc = ifp->if_softc; 324 325 GRE_DPRINTF(sc, "\n"); 326 327 bpf_detach(ifp); 328 s = splnet(); 329 if_detach(ifp); 330 331 GRE_DPRINTF(sc, "\n"); 332 /* Note that we must not hold the mutex while we call gre_reconf(). */ 333 gre_reconf(sc, NULL); 334 335 mutex_enter(&sc->sc_mtx); 336 sc->sc_msg = GRE_M_STOP; 337 cv_signal(&sc->sc_fp_condvar); 338 while (sc->sc_fp_waiters > 0) 339 cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); 340 mutex_exit(&sc->sc_mtx); 341 342 splx(s); 343 344 cv_destroy(&sc->sc_condvar); 345 cv_destroy(&sc->sc_fp_condvar); 346 mutex_destroy(&sc->sc_mtx); 347 gre_bufq_destroy(&sc->sc_snd); 348 gre_evcnt_detach(sc); 349 free(sc, M_DEVBUF); 350 351 return 0; 352 } 353 354 static void 355 gre_receive(struct socket *so, void *arg, int events, int waitflag) 356 { 357 struct gre_softc *sc = (struct gre_softc *)arg; 358 int rc; 359 const struct gre_h *gh; 360 struct mbuf *m; 361 362 GRE_DPRINTF(sc, "enter\n"); 363 364 sc->sc_recv_ev.ev_count++; 365 366 rc = gre_soreceive(so, &m); 367 /* TBD Back off if ECONNREFUSED (indicates 368 * ICMP Port Unreachable)? 369 */ 370 if (rc == EWOULDBLOCK) { 371 GRE_DPRINTF(sc, "EWOULDBLOCK\n"); 372 sc->sc_block_ev.ev_count++; 373 return; 374 } else if (rc != 0 || m == NULL) { 375 GRE_DPRINTF(sc, "%s: rc %d m %p\n", 376 sc->sc_if.if_xname, rc, (void *)m); 377 sc->sc_error_ev.ev_count++; 378 return; 379 } 380 if (m->m_len < sizeof(*gh) && (m = m_pullup(m, sizeof(*gh))) == NULL) { 381 GRE_DPRINTF(sc, "m_pullup failed\n"); 382 sc->sc_pullup_ev.ev_count++; 383 return; 384 } 385 gh = mtod(m, const struct gre_h *); 386 387 if (gre_input(sc, m, 0, gh) == 0) { 388 sc->sc_unsupp_ev.ev_count++; 389 GRE_DPRINTF(sc, "dropping unsupported\n"); 390 m_freem(m); 391 } 392 } 393 394 static void 395 gre_upcall_add(struct socket *so, void *arg) 396 { 397 /* XXX What if the kernel already set an upcall? */ 398 KASSERT((so->so_rcv.sb_flags & SB_UPCALL) == 0); 399 so->so_upcallarg = arg; 400 so->so_upcall = gre_receive; 401 so->so_rcv.sb_flags |= SB_UPCALL; 402 } 403 404 static void 405 gre_upcall_remove(struct socket *so) 406 { 407 so->so_rcv.sb_flags &= ~SB_UPCALL; 408 so->so_upcallarg = NULL; 409 so->so_upcall = NULL; 410 } 411 412 static int 413 gre_socreate(struct gre_softc *sc, const struct gre_soparm *sp, int *fdout) 414 { 415 int fd, rc; 416 struct mbuf *m; 417 struct sockaddr *sa; 418 struct socket *so; 419 sa_family_t af; 420 int val; 421 422 GRE_DPRINTF(sc, "enter\n"); 423 424 af = sp->sp_src.ss_family; 425 rc = fsocreate(af, NULL, sp->sp_type, sp->sp_proto, curlwp, &fd); 426 if (rc != 0) { 427 GRE_DPRINTF(sc, "fsocreate failed\n"); 428 return rc; 429 } 430 431 if ((rc = fd_getsock(fd, &so)) != 0) 432 return rc; 433 434 if ((m = getsombuf(so, MT_SONAME)) == NULL) { 435 rc = ENOBUFS; 436 goto out; 437 } 438 sa = mtod(m, struct sockaddr *); 439 sockaddr_copy(sa, MIN(MLEN, sizeof(sp->sp_src)), sstocsa(&sp->sp_src)); 440 m->m_len = sp->sp_src.ss_len; 441 442 if ((rc = sobind(so, m, curlwp)) != 0) { 443 GRE_DPRINTF(sc, "sobind failed\n"); 444 goto out; 445 } 446 447 sockaddr_copy(sa, MIN(MLEN, sizeof(sp->sp_dst)), sstocsa(&sp->sp_dst)); 448 m->m_len = sp->sp_dst.ss_len; 449 450 solock(so); 451 if ((rc = soconnect(so, m, curlwp)) != 0) { 452 GRE_DPRINTF(sc, "soconnect failed\n"); 453 sounlock(so); 454 goto out; 455 } 456 sounlock(so); 457 458 m = NULL; 459 460 /* XXX convert to a (new) SOL_SOCKET call */ 461 KASSERT(so->so_proto != NULL); 462 rc = so_setsockopt(curlwp, so, IPPROTO_IP, IP_TTL, 463 &ip_gre_ttl, sizeof(ip_gre_ttl)); 464 if (rc != 0) { 465 GRE_DPRINTF(sc, "so_setsockopt ttl failed\n"); 466 rc = 0; 467 } 468 469 val = 1; 470 rc = so_setsockopt(curlwp, so, SOL_SOCKET, SO_NOHEADER, 471 &val, sizeof(val)); 472 if (rc != 0) { 473 GRE_DPRINTF(sc, "so_setsockopt SO_NOHEADER failed\n"); 474 rc = 0; 475 } 476 out: 477 m_freem(m); 478 479 if (rc != 0) 480 fd_close(fd); 481 else { 482 fd_putfile(fd); 483 *fdout = fd; 484 } 485 486 return rc; 487 } 488 489 static int 490 gre_sosend(struct socket *so, struct mbuf *top) 491 { 492 struct proc *p; 493 long space, resid; 494 int error; 495 struct lwp * const l = curlwp; 496 497 p = l->l_proc; 498 499 resid = top->m_pkthdr.len; 500 if (p) 501 l->l_ru.ru_msgsnd++; 502 #define snderr(errno) { error = errno; goto release; } 503 504 solock(so); 505 if ((error = sblock(&so->so_snd, M_NOWAIT)) != 0) 506 goto out; 507 if (so->so_state & SS_CANTSENDMORE) 508 snderr(EPIPE); 509 if (so->so_error) { 510 error = so->so_error; 511 so->so_error = 0; 512 goto release; 513 } 514 if ((so->so_state & SS_ISCONNECTED) == 0) { 515 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 516 snderr(ENOTCONN); 517 } else { 518 snderr(EDESTADDRREQ); 519 } 520 } 521 space = sbspace(&so->so_snd); 522 if (resid > so->so_snd.sb_hiwat) 523 snderr(EMSGSIZE); 524 if (space < resid) 525 snderr(EWOULDBLOCK); 526 /* 527 * Data is prepackaged in "top". 528 */ 529 if (so->so_state & SS_CANTSENDMORE) 530 snderr(EPIPE); 531 error = (*so->so_proto->pr_usrreq)(so, PRU_SEND, top, NULL, NULL, l); 532 top = NULL; 533 release: 534 sbunlock(&so->so_snd); 535 out: 536 sounlock(so); 537 if (top != NULL) 538 m_freem(top); 539 return error; 540 } 541 542 /* This is a stripped-down version of soreceive() that will never 543 * block. It will support SOCK_DGRAM sockets. It may also support 544 * SOCK_SEQPACKET sockets. 545 */ 546 static int 547 gre_soreceive(struct socket *so, struct mbuf **mp0) 548 { 549 struct mbuf *m, **mp; 550 int flags, len, error, type; 551 const struct protosw *pr; 552 struct mbuf *nextrecord; 553 554 KASSERT(mp0 != NULL); 555 556 flags = MSG_DONTWAIT; 557 pr = so->so_proto; 558 mp = mp0; 559 type = 0; 560 561 *mp = NULL; 562 563 KASSERT(pr->pr_flags & PR_ATOMIC); 564 restart: 565 if ((error = sblock(&so->so_rcv, M_NOWAIT)) != 0) { 566 return error; 567 } 568 m = so->so_rcv.sb_mb; 569 /* 570 * If we have less data than requested, do not block awaiting more. 571 */ 572 if (m == NULL) { 573 #ifdef DIAGNOSTIC 574 if (so->so_rcv.sb_cc) 575 panic("receive 1"); 576 #endif 577 if (so->so_error) { 578 error = so->so_error; 579 so->so_error = 0; 580 } else if (so->so_state & SS_CANTRCVMORE) 581 ; 582 else if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 583 && (so->so_proto->pr_flags & PR_CONNREQUIRED)) 584 error = ENOTCONN; 585 else 586 error = EWOULDBLOCK; 587 goto release; 588 } 589 /* 590 * On entry here, m points to the first record of the socket buffer. 591 * While we process the initial mbufs containing address and control 592 * info, we save a copy of m->m_nextpkt into nextrecord. 593 */ 594 if (curlwp != NULL) 595 curlwp->l_ru.ru_msgrcv++; 596 KASSERT(m == so->so_rcv.sb_mb); 597 SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); 598 SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); 599 nextrecord = m->m_nextpkt; 600 if (pr->pr_flags & PR_ADDR) { 601 #ifdef DIAGNOSTIC 602 if (m->m_type != MT_SONAME) 603 panic("receive 1a"); 604 #endif 605 sbfree(&so->so_rcv, m); 606 MFREE(m, so->so_rcv.sb_mb); 607 m = so->so_rcv.sb_mb; 608 } 609 while (m != NULL && m->m_type == MT_CONTROL && error == 0) { 610 sbfree(&so->so_rcv, m); 611 /* 612 * Dispose of any SCM_RIGHTS message that went 613 * through the read path rather than recv. 614 */ 615 if (pr->pr_domain->dom_dispose && 616 mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) 617 (*pr->pr_domain->dom_dispose)(m); 618 MFREE(m, so->so_rcv.sb_mb); 619 m = so->so_rcv.sb_mb; 620 } 621 622 /* 623 * If m is non-NULL, we have some data to read. From now on, 624 * make sure to keep sb_lastrecord consistent when working on 625 * the last packet on the chain (nextrecord == NULL) and we 626 * change m->m_nextpkt. 627 */ 628 if (m != NULL) { 629 m->m_nextpkt = nextrecord; 630 /* 631 * If nextrecord == NULL (this is a single chain), 632 * then sb_lastrecord may not be valid here if m 633 * was changed earlier. 634 */ 635 if (nextrecord == NULL) { 636 KASSERT(so->so_rcv.sb_mb == m); 637 so->so_rcv.sb_lastrecord = m; 638 } 639 type = m->m_type; 640 if (type == MT_OOBDATA) 641 flags |= MSG_OOB; 642 } else { 643 KASSERT(so->so_rcv.sb_mb == m); 644 so->so_rcv.sb_mb = nextrecord; 645 SB_EMPTY_FIXUP(&so->so_rcv); 646 } 647 SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); 648 SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); 649 650 while (m != NULL) { 651 if (m->m_type == MT_OOBDATA) { 652 if (type != MT_OOBDATA) 653 break; 654 } else if (type == MT_OOBDATA) 655 break; 656 #ifdef DIAGNOSTIC 657 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 658 panic("receive 3"); 659 #endif 660 so->so_state &= ~SS_RCVATMARK; 661 if (so->so_oobmark != 0 && so->so_oobmark < m->m_len) 662 break; 663 len = m->m_len; 664 /* 665 * mp is set, just pass back the mbufs. 666 * Sockbuf must be consistent here (points to current mbuf, 667 * it points to next record) when we drop priority; 668 * we must note any additions to the sockbuf when we 669 * block interrupts again. 670 */ 671 if (m->m_flags & M_EOR) 672 flags |= MSG_EOR; 673 nextrecord = m->m_nextpkt; 674 sbfree(&so->so_rcv, m); 675 *mp = m; 676 mp = &m->m_next; 677 so->so_rcv.sb_mb = m = m->m_next; 678 *mp = NULL; 679 /* 680 * If m != NULL, we also know that 681 * so->so_rcv.sb_mb != NULL. 682 */ 683 KASSERT(so->so_rcv.sb_mb == m); 684 if (m) { 685 m->m_nextpkt = nextrecord; 686 if (nextrecord == NULL) 687 so->so_rcv.sb_lastrecord = m; 688 } else { 689 so->so_rcv.sb_mb = nextrecord; 690 SB_EMPTY_FIXUP(&so->so_rcv); 691 } 692 SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); 693 SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); 694 if (so->so_oobmark) { 695 so->so_oobmark -= len; 696 if (so->so_oobmark == 0) { 697 so->so_state |= SS_RCVATMARK; 698 break; 699 } 700 } 701 if (flags & MSG_EOR) 702 break; 703 } 704 705 if (m != NULL) { 706 m_freem(*mp); 707 *mp = NULL; 708 error = ENOMEM; 709 (void) sbdroprecord(&so->so_rcv); 710 } else { 711 /* 712 * First part is an inline SB_EMPTY_FIXUP(). Second 713 * part makes sure sb_lastrecord is up-to-date if 714 * there is still data in the socket buffer. 715 */ 716 so->so_rcv.sb_mb = nextrecord; 717 if (so->so_rcv.sb_mb == NULL) { 718 so->so_rcv.sb_mbtail = NULL; 719 so->so_rcv.sb_lastrecord = NULL; 720 } else if (nextrecord->m_nextpkt == NULL) 721 so->so_rcv.sb_lastrecord = nextrecord; 722 } 723 SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); 724 SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); 725 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 726 (*pr->pr_usrreq)(so, PRU_RCVD, NULL, 727 (struct mbuf *)(long)flags, NULL, curlwp); 728 if (*mp0 == NULL && (flags & MSG_EOR) == 0 && 729 (so->so_state & SS_CANTRCVMORE) == 0) { 730 sbunlock(&so->so_rcv); 731 goto restart; 732 } 733 734 release: 735 sbunlock(&so->so_rcv); 736 return error; 737 } 738 739 static struct socket * 740 gre_reconf(struct gre_softc *sc, const struct gre_soparm *newsoparm) 741 { 742 struct ifnet *ifp = &sc->sc_if; 743 744 GRE_DPRINTF(sc, "enter\n"); 745 746 shutdown: 747 if (sc->sc_soparm.sp_so != NULL) { 748 GRE_DPRINTF(sc, "\n"); 749 gre_upcall_remove(sc->sc_soparm.sp_so); 750 softint_disestablish(sc->sc_si); 751 sc->sc_si = NULL; 752 gre_fp_send(sc, GRE_M_DELFP, NULL); 753 gre_clearconf(&sc->sc_soparm, false); 754 } 755 756 if (newsoparm != NULL) { 757 GRE_DPRINTF(sc, "\n"); 758 sc->sc_soparm = *newsoparm; 759 newsoparm = NULL; 760 } 761 762 if (sc->sc_soparm.sp_so != NULL) { 763 GRE_DPRINTF(sc, "\n"); 764 sc->sc_si = softint_establish(SOFTINT_NET, greintr, sc); 765 gre_upcall_add(sc->sc_soparm.sp_so, sc); 766 if ((ifp->if_flags & IFF_UP) == 0) { 767 GRE_DPRINTF(sc, "down\n"); 768 goto shutdown; 769 } 770 } 771 772 GRE_DPRINTF(sc, "\n"); 773 if (sc->sc_soparm.sp_so != NULL) 774 sc->sc_if.if_flags |= IFF_RUNNING; 775 else { 776 gre_bufq_purge(&sc->sc_snd); 777 sc->sc_if.if_flags &= ~IFF_RUNNING; 778 } 779 return sc->sc_soparm.sp_so; 780 } 781 782 static int 783 gre_input(struct gre_softc *sc, struct mbuf *m, int hlen, 784 const struct gre_h *gh) 785 { 786 uint16_t flags; 787 uint32_t af; /* af passed to BPF tap */ 788 int isr, s; 789 struct ifqueue *ifq; 790 791 sc->sc_if.if_ipackets++; 792 sc->sc_if.if_ibytes += m->m_pkthdr.len; 793 794 hlen += sizeof(struct gre_h); 795 796 /* process GRE flags as packet can be of variable len */ 797 flags = ntohs(gh->flags); 798 799 /* Checksum & Offset are present */ 800 if ((flags & GRE_CP) | (flags & GRE_RP)) 801 hlen += 4; 802 /* We don't support routing fields (variable length) */ 803 if (flags & GRE_RP) { 804 sc->sc_if.if_ierrors++; 805 return 0; 806 } 807 if (flags & GRE_KP) 808 hlen += 4; 809 if (flags & GRE_SP) 810 hlen += 4; 811 812 switch (ntohs(gh->ptype)) { /* ethertypes */ 813 #ifdef INET 814 case ETHERTYPE_IP: 815 ifq = &ipintrq; 816 isr = NETISR_IP; 817 af = AF_INET; 818 break; 819 #endif 820 #ifdef NETATALK 821 case ETHERTYPE_ATALK: 822 ifq = &atintrq1; 823 isr = NETISR_ATALK; 824 af = AF_APPLETALK; 825 break; 826 #endif 827 #ifdef INET6 828 case ETHERTYPE_IPV6: 829 ifq = &ip6intrq; 830 isr = NETISR_IPV6; 831 af = AF_INET6; 832 break; 833 #endif 834 #ifdef MPLS 835 case ETHERTYPE_MPLS: 836 ifq = &mplsintrq; 837 isr = NETISR_MPLS; 838 af = AF_MPLS; 839 break; 840 #endif 841 default: /* others not yet supported */ 842 GRE_DPRINTF(sc, "unhandled ethertype 0x%04x\n", 843 ntohs(gh->ptype)); 844 sc->sc_if.if_noproto++; 845 return 0; 846 } 847 848 if (hlen > m->m_pkthdr.len) { 849 m_freem(m); 850 sc->sc_if.if_ierrors++; 851 return EINVAL; 852 } 853 m_adj(m, hlen); 854 855 bpf_mtap_af(&sc->sc_if, af, m); 856 857 m->m_pkthdr.rcvif = &sc->sc_if; 858 859 s = splnet(); 860 if (IF_QFULL(ifq)) { 861 IF_DROP(ifq); 862 m_freem(m); 863 } else { 864 IF_ENQUEUE(ifq, m); 865 } 866 /* we need schednetisr since the address family may change */ 867 schednetisr(isr); 868 splx(s); 869 870 return 1; /* packet is done, no further processing needed */ 871 } 872 873 /* 874 * The output routine. Takes a packet and encapsulates it in the protocol 875 * given by sc->sc_soparm.sp_proto. See also RFC 1701 and RFC 2004 876 */ 877 static int 878 gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 879 struct rtentry *rt) 880 { 881 int error = 0; 882 struct gre_softc *sc = ifp->if_softc; 883 struct gre_h *gh; 884 uint16_t etype = 0; 885 886 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 887 m_freem(m); 888 error = ENETDOWN; 889 goto end; 890 } 891 892 bpf_mtap_af(ifp, dst->sa_family, m); 893 894 m->m_flags &= ~(M_BCAST|M_MCAST); 895 896 GRE_DPRINTF(sc, "dst->sa_family=%d\n", dst->sa_family); 897 switch (dst->sa_family) { 898 #ifdef INET 899 case AF_INET: 900 /* TBD Extract the IP ToS field and set the 901 * encapsulating protocol's ToS to suit. 902 */ 903 etype = htons(ETHERTYPE_IP); 904 break; 905 #endif 906 #ifdef NETATALK 907 case AF_APPLETALK: 908 etype = htons(ETHERTYPE_ATALK); 909 break; 910 #endif 911 #ifdef INET6 912 case AF_INET6: 913 etype = htons(ETHERTYPE_IPV6); 914 break; 915 #endif 916 default: 917 IF_DROP(&ifp->if_snd); 918 m_freem(m); 919 error = EAFNOSUPPORT; 920 goto end; 921 } 922 923 #ifdef MPLS 924 if (rt != NULL && rt_gettag(rt) != NULL) { 925 union mpls_shim msh; 926 msh.s_addr = MPLS_GETSADDR(rt); 927 if (msh.shim.label != MPLS_LABEL_IMPLNULL) 928 etype = htons(ETHERTYPE_MPLS); 929 } 930 #endif 931 932 M_PREPEND(m, sizeof(*gh), M_DONTWAIT); 933 934 if (m == NULL) { 935 IF_DROP(&ifp->if_snd); 936 error = ENOBUFS; 937 goto end; 938 } 939 940 gh = mtod(m, struct gre_h *); 941 gh->flags = 0; 942 gh->ptype = etype; 943 /* XXX Need to handle IP ToS. Look at how I handle IP TTL. */ 944 945 ifp->if_opackets++; 946 ifp->if_obytes += m->m_pkthdr.len; 947 948 /* Clear checksum-offload flags. */ 949 m->m_pkthdr.csum_flags = 0; 950 m->m_pkthdr.csum_data = 0; 951 952 /* send it off */ 953 if ((error = gre_bufq_enqueue(&sc->sc_snd, m)) != 0) { 954 sc->sc_oflow_ev.ev_count++; 955 m_freem(m); 956 } else 957 softint_schedule(sc->sc_si); 958 end: 959 if (error) 960 ifp->if_oerrors++; 961 return error; 962 } 963 964 static int 965 gre_getname(struct socket *so, int req, struct mbuf *nam, struct lwp *l) 966 { 967 return (*so->so_proto->pr_usrreq)(so, req, NULL, nam, NULL, l); 968 } 969 970 static int 971 gre_getsockname(struct socket *so, struct mbuf *nam, struct lwp *l) 972 { 973 return gre_getname(so, PRU_SOCKADDR, nam, l); 974 } 975 976 static int 977 gre_getpeername(struct socket *so, struct mbuf *nam, struct lwp *l) 978 { 979 return gre_getname(so, PRU_PEERADDR, nam, l); 980 } 981 982 static int 983 gre_getnames(struct socket *so, struct lwp *l, struct sockaddr_storage *src, 984 struct sockaddr_storage *dst) 985 { 986 struct mbuf *m; 987 struct sockaddr_storage *ss; 988 int rc; 989 990 if ((m = getsombuf(so, MT_SONAME)) == NULL) 991 return ENOBUFS; 992 993 ss = mtod(m, struct sockaddr_storage *); 994 995 solock(so); 996 if ((rc = gre_getsockname(so, m, l)) != 0) 997 goto out; 998 *src = *ss; 999 1000 if ((rc = gre_getpeername(so, m, l)) != 0) 1001 goto out; 1002 *dst = *ss; 1003 out: 1004 sounlock(so); 1005 m_freem(m); 1006 return rc; 1007 } 1008 1009 static void 1010 gre_fp_recvloop(void *arg) 1011 { 1012 struct gre_softc *sc = arg; 1013 1014 mutex_enter(&sc->sc_mtx); 1015 while (gre_fp_recv(sc)) 1016 ; 1017 mutex_exit(&sc->sc_mtx); 1018 kthread_exit(0); 1019 } 1020 1021 static bool 1022 gre_fp_recv(struct gre_softc *sc) 1023 { 1024 int fd, ofd, rc; 1025 file_t *fp; 1026 1027 fp = sc->sc_fp; 1028 ofd = sc->sc_fd; 1029 fd = -1; 1030 1031 switch (sc->sc_msg) { 1032 case GRE_M_STOP: 1033 cv_signal(&sc->sc_fp_condvar); 1034 return false; 1035 case GRE_M_SETFP: 1036 mutex_exit(&sc->sc_mtx); 1037 rc = fd_dup(fp, 0, &fd, 0); 1038 mutex_enter(&sc->sc_mtx); 1039 if (rc != 0) { 1040 sc->sc_msg = GRE_M_ERR; 1041 break; 1042 } 1043 /*FALLTHROUGH*/ 1044 case GRE_M_DELFP: 1045 mutex_exit(&sc->sc_mtx); 1046 if (ofd != -1 && fd_getfile(ofd) != NULL) 1047 fd_close(ofd); 1048 mutex_enter(&sc->sc_mtx); 1049 sc->sc_fd = fd; 1050 sc->sc_msg = GRE_M_OK; 1051 break; 1052 default: 1053 gre_fp_wait(sc); 1054 return true; 1055 } 1056 cv_signal(&sc->sc_fp_condvar); 1057 return true; 1058 } 1059 1060 static bool 1061 gre_fp_send(struct gre_softc *sc, enum gre_msg msg, file_t *fp) 1062 { 1063 bool rc; 1064 1065 mutex_enter(&sc->sc_mtx); 1066 while (sc->sc_msg != GRE_M_NONE) 1067 gre_fp_wait(sc); 1068 sc->sc_fp = fp; 1069 sc->sc_msg = msg; 1070 cv_signal(&sc->sc_fp_condvar); 1071 while (sc->sc_msg != GRE_M_STOP && sc->sc_msg != GRE_M_OK && 1072 sc->sc_msg != GRE_M_ERR) 1073 gre_fp_wait(sc); 1074 rc = (sc->sc_msg != GRE_M_ERR); 1075 sc->sc_msg = GRE_M_NONE; 1076 cv_signal(&sc->sc_fp_condvar); 1077 mutex_exit(&sc->sc_mtx); 1078 return rc; 1079 } 1080 1081 static int 1082 gre_ssock(struct ifnet *ifp, struct gre_soparm *sp, int fd) 1083 { 1084 int error = 0; 1085 const struct protosw *pr; 1086 file_t *fp; 1087 struct gre_softc *sc = ifp->if_softc; 1088 struct socket *so; 1089 struct sockaddr_storage dst, src; 1090 1091 if ((fp = fd_getfile(fd)) == NULL) 1092 return EBADF; 1093 if (fp->f_type != DTYPE_SOCKET) { 1094 fd_putfile(fd); 1095 return ENOTSOCK; 1096 } 1097 1098 GRE_DPRINTF(sc, "\n"); 1099 1100 so = (struct socket *)fp->f_data; 1101 pr = so->so_proto; 1102 1103 GRE_DPRINTF(sc, "type %d, proto %d\n", pr->pr_type, pr->pr_protocol); 1104 1105 if ((pr->pr_flags & PR_ATOMIC) == 0 || 1106 (sp->sp_type != 0 && pr->pr_type != sp->sp_type) || 1107 (sp->sp_proto != 0 && pr->pr_protocol != 0 && 1108 pr->pr_protocol != sp->sp_proto)) { 1109 error = EINVAL; 1110 goto err; 1111 } 1112 1113 GRE_DPRINTF(sc, "\n"); 1114 1115 /* check address */ 1116 if ((error = gre_getnames(so, curlwp, &src, &dst)) != 0) 1117 goto err; 1118 1119 GRE_DPRINTF(sc, "\n"); 1120 1121 if (!gre_fp_send(sc, GRE_M_SETFP, fp)) { 1122 error = EBUSY; 1123 goto err; 1124 } 1125 1126 GRE_DPRINTF(sc, "\n"); 1127 1128 sp->sp_src = src; 1129 sp->sp_dst = dst; 1130 1131 sp->sp_so = so; 1132 1133 err: 1134 fd_putfile(fd); 1135 return error; 1136 } 1137 1138 static bool 1139 sockaddr_is_anyaddr(const struct sockaddr *sa) 1140 { 1141 socklen_t anylen, salen; 1142 const void *anyaddr, *addr; 1143 1144 if ((anyaddr = sockaddr_anyaddr(sa, &anylen)) == NULL || 1145 (addr = sockaddr_const_addr(sa, &salen)) == NULL) 1146 return false; 1147 1148 if (salen > anylen) 1149 return false; 1150 1151 return memcmp(anyaddr, addr, MIN(anylen, salen)) == 0; 1152 } 1153 1154 static bool 1155 gre_is_nullconf(const struct gre_soparm *sp) 1156 { 1157 return sockaddr_is_anyaddr(sstocsa(&sp->sp_src)) || 1158 sockaddr_is_anyaddr(sstocsa(&sp->sp_dst)); 1159 } 1160 1161 static void 1162 gre_clearconf(struct gre_soparm *sp, bool force) 1163 { 1164 if (sp->sp_bysock || force) { 1165 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1166 sockaddr_any(sstosa(&sp->sp_src))); 1167 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1168 sockaddr_any(sstosa(&sp->sp_dst))); 1169 sp->sp_bysock = false; 1170 } 1171 sp->sp_so = NULL; /* XXX */ 1172 } 1173 1174 static int 1175 gre_ioctl(struct ifnet *ifp, const u_long cmd, void *data) 1176 { 1177 struct ifreq *ifr; 1178 struct if_laddrreq *lifr = (struct if_laddrreq *)data; 1179 struct gre_softc *sc = ifp->if_softc; 1180 struct gre_soparm *sp; 1181 int fd, error = 0, oproto, otype, s; 1182 struct gre_soparm sp0; 1183 1184 ifr = data; 1185 1186 GRE_DPRINTF(sc, "cmd %lu\n", cmd); 1187 1188 switch (cmd) { 1189 case GRESPROTO: 1190 case GRESADDRD: 1191 case GRESADDRS: 1192 case GRESSOCK: 1193 case GREDSOCK: 1194 if (kauth_authorize_network(curlwp->l_cred, 1195 KAUTH_NETWORK_INTERFACE, 1196 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1197 NULL) != 0) 1198 return EPERM; 1199 break; 1200 default: 1201 break; 1202 } 1203 1204 s = splnet(); 1205 1206 sp0 = sc->sc_soparm; 1207 sp0.sp_so = NULL; 1208 sp = &sp0; 1209 1210 GRE_DPRINTF(sc, "\n"); 1211 1212 switch (cmd) { 1213 case SIOCINITIFADDR: 1214 GRE_DPRINTF(sc, "\n"); 1215 if ((ifp->if_flags & IFF_UP) != 0) 1216 break; 1217 gre_clearconf(sp, false); 1218 ifp->if_flags |= IFF_UP; 1219 goto mksocket; 1220 case SIOCSIFFLAGS: 1221 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1222 break; 1223 oproto = sp->sp_proto; 1224 otype = sp->sp_type; 1225 switch (ifr->ifr_flags & (IFF_LINK0|IFF_LINK2)) { 1226 case IFF_LINK0|IFF_LINK2: 1227 sp->sp_proto = IPPROTO_UDP; 1228 sp->sp_type = SOCK_DGRAM; 1229 break; 1230 case IFF_LINK2: 1231 sp->sp_proto = 0; 1232 sp->sp_type = 0; 1233 break; 1234 case IFF_LINK0: 1235 sp->sp_proto = IPPROTO_GRE; 1236 sp->sp_type = SOCK_RAW; 1237 break; 1238 default: 1239 GRE_DPRINTF(sc, "\n"); 1240 error = EINVAL; 1241 goto out; 1242 } 1243 GRE_DPRINTF(sc, "\n"); 1244 gre_clearconf(sp, false); 1245 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == 1246 (IFF_UP|IFF_RUNNING) && 1247 (oproto == sp->sp_proto || sp->sp_proto == 0) && 1248 (otype == sp->sp_type || sp->sp_type == 0)) 1249 break; 1250 switch (sp->sp_proto) { 1251 case IPPROTO_UDP: 1252 case IPPROTO_GRE: 1253 goto mksocket; 1254 default: 1255 break; 1256 } 1257 break; 1258 case SIOCSIFMTU: 1259 /* XXX determine MTU automatically by probing w/ 1260 * XXX do-not-fragment packets? 1261 */ 1262 if (ifr->ifr_mtu < 576) { 1263 error = EINVAL; 1264 break; 1265 } 1266 /*FALLTHROUGH*/ 1267 case SIOCGIFMTU: 1268 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1269 error = 0; 1270 break; 1271 case SIOCADDMULTI: 1272 case SIOCDELMULTI: 1273 if (ifr == NULL) { 1274 error = EAFNOSUPPORT; 1275 break; 1276 } 1277 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 1278 #ifdef INET 1279 case AF_INET: 1280 break; 1281 #endif 1282 #ifdef INET6 1283 case AF_INET6: 1284 break; 1285 #endif 1286 default: 1287 error = EAFNOSUPPORT; 1288 break; 1289 } 1290 break; 1291 case GRESPROTO: 1292 gre_clearconf(sp, false); 1293 oproto = sp->sp_proto; 1294 otype = sp->sp_type; 1295 sp->sp_proto = ifr->ifr_flags; 1296 switch (sp->sp_proto) { 1297 case IPPROTO_UDP: 1298 ifp->if_flags |= IFF_LINK0|IFF_LINK2; 1299 sp->sp_type = SOCK_DGRAM; 1300 break; 1301 case IPPROTO_GRE: 1302 ifp->if_flags |= IFF_LINK0; 1303 ifp->if_flags &= ~IFF_LINK2; 1304 sp->sp_type = SOCK_RAW; 1305 break; 1306 case 0: 1307 ifp->if_flags &= ~IFF_LINK0; 1308 ifp->if_flags |= IFF_LINK2; 1309 sp->sp_type = 0; 1310 break; 1311 default: 1312 error = EPROTONOSUPPORT; 1313 break; 1314 } 1315 if ((oproto == sp->sp_proto || sp->sp_proto == 0) && 1316 (otype == sp->sp_type || sp->sp_type == 0)) 1317 break; 1318 switch (sp->sp_proto) { 1319 case IPPROTO_UDP: 1320 case IPPROTO_GRE: 1321 goto mksocket; 1322 default: 1323 break; 1324 } 1325 break; 1326 case GREGPROTO: 1327 ifr->ifr_flags = sp->sp_proto; 1328 break; 1329 case GRESADDRS: 1330 case GRESADDRD: 1331 gre_clearconf(sp, false); 1332 /* set tunnel endpoints and mark interface as up */ 1333 switch (cmd) { 1334 case GRESADDRS: 1335 sockaddr_copy(sstosa(&sp->sp_src), 1336 sizeof(sp->sp_src), ifreq_getaddr(cmd, ifr)); 1337 break; 1338 case GRESADDRD: 1339 sockaddr_copy(sstosa(&sp->sp_dst), 1340 sizeof(sp->sp_dst), ifreq_getaddr(cmd, ifr)); 1341 break; 1342 } 1343 checkaddr: 1344 if (sockaddr_any(sstosa(&sp->sp_src)) == NULL || 1345 sockaddr_any(sstosa(&sp->sp_dst)) == NULL) { 1346 error = EINVAL; 1347 break; 1348 } 1349 /* let gre_socreate() check the rest */ 1350 mksocket: 1351 GRE_DPRINTF(sc, "\n"); 1352 /* If we're administratively down, or the configuration 1353 * is empty, there's no use creating a socket. 1354 */ 1355 if ((ifp->if_flags & IFF_UP) == 0 || gre_is_nullconf(sp)) 1356 goto sendconf; 1357 1358 GRE_DPRINTF(sc, "\n"); 1359 fd = 0; 1360 error = gre_socreate(sc, sp, &fd); 1361 if (error != 0) 1362 break; 1363 1364 setsock: 1365 GRE_DPRINTF(sc, "\n"); 1366 1367 error = gre_ssock(ifp, sp, fd); 1368 1369 if (cmd != GRESSOCK) { 1370 GRE_DPRINTF(sc, "\n"); 1371 /* XXX v. dodgy */ 1372 if (fd_getfile(fd) != NULL) 1373 fd_close(fd); 1374 } 1375 1376 if (error == 0) { 1377 sendconf: 1378 GRE_DPRINTF(sc, "\n"); 1379 ifp->if_flags &= ~IFF_RUNNING; 1380 gre_reconf(sc, sp); 1381 } 1382 1383 break; 1384 case GREGADDRS: 1385 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_src)); 1386 break; 1387 case GREGADDRD: 1388 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_dst)); 1389 break; 1390 case GREDSOCK: 1391 GRE_DPRINTF(sc, "\n"); 1392 if (sp->sp_bysock) 1393 ifp->if_flags &= ~IFF_UP; 1394 gre_clearconf(sp, false); 1395 goto mksocket; 1396 case GRESSOCK: 1397 GRE_DPRINTF(sc, "\n"); 1398 gre_clearconf(sp, true); 1399 fd = (int)ifr->ifr_value; 1400 sp->sp_bysock = true; 1401 ifp->if_flags |= IFF_UP; 1402 goto setsock; 1403 case SIOCSLIFPHYADDR: 1404 GRE_DPRINTF(sc, "\n"); 1405 if (lifr->addr.ss_family != lifr->dstaddr.ss_family) { 1406 error = EAFNOSUPPORT; 1407 break; 1408 } 1409 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1410 sstosa(&lifr->addr)); 1411 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1412 sstosa(&lifr->dstaddr)); 1413 GRE_DPRINTF(sc, "\n"); 1414 goto checkaddr; 1415 case SIOCDIFPHYADDR: 1416 GRE_DPRINTF(sc, "\n"); 1417 gre_clearconf(sp, true); 1418 ifp->if_flags &= ~IFF_UP; 1419 goto mksocket; 1420 case SIOCGLIFPHYADDR: 1421 GRE_DPRINTF(sc, "\n"); 1422 if (gre_is_nullconf(sp)) { 1423 error = EADDRNOTAVAIL; 1424 break; 1425 } 1426 sockaddr_copy(sstosa(&lifr->addr), sizeof(lifr->addr), 1427 sstosa(&sp->sp_src)); 1428 sockaddr_copy(sstosa(&lifr->dstaddr), sizeof(lifr->dstaddr), 1429 sstosa(&sp->sp_dst)); 1430 GRE_DPRINTF(sc, "\n"); 1431 break; 1432 default: 1433 error = ifioctl_common(ifp, cmd, data); 1434 break; 1435 } 1436 out: 1437 GRE_DPRINTF(sc, "\n"); 1438 splx(s); 1439 return error; 1440 } 1441 1442 void greattach(int); 1443 1444 /* ARGSUSED */ 1445 void 1446 greattach(int count) 1447 { 1448 if_clone_attach(&gre_cloner); 1449 } 1450
Indexes created Sun Oct 19 16:10:00 GMT 2025