if_gre.c revision 1.150.14.2
1 /* $NetBSD: if_gre.c,v 1.150.14.2 2014/05/18 17:46:12 rmind 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 1.150.14.2 2014/05/18 17:46:12 rmind 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, &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_usrreqs->pr_generic)(so, 532 PRU_SEND, top, NULL, NULL, l); 533 top = NULL; 534 release: 535 sbunlock(&so->so_snd); 536 out: 537 sounlock(so); 538 if (top != NULL) 539 m_freem(top); 540 return error; 541 } 542 543 /* This is a stripped-down version of soreceive() that will never 544 * block. It will support SOCK_DGRAM sockets. It may also support 545 * SOCK_SEQPACKET sockets. 546 */ 547 static int 548 gre_soreceive(struct socket *so, struct mbuf **mp0) 549 { 550 struct mbuf *m, **mp; 551 int flags, len, error, type; 552 const struct protosw *pr; 553 struct mbuf *nextrecord; 554 555 KASSERT(mp0 != NULL); 556 557 flags = MSG_DONTWAIT; 558 pr = so->so_proto; 559 mp = mp0; 560 type = 0; 561 562 *mp = NULL; 563 564 KASSERT(pr->pr_flags & PR_ATOMIC); 565 restart: 566 if ((error = sblock(&so->so_rcv, M_NOWAIT)) != 0) { 567 return error; 568 } 569 m = so->so_rcv.sb_mb; 570 /* 571 * If we have less data than requested, do not block awaiting more. 572 */ 573 if (m == NULL) { 574 #ifdef DIAGNOSTIC 575 if (so->so_rcv.sb_cc) 576 panic("receive 1"); 577 #endif 578 if (so->so_error) { 579 error = so->so_error; 580 so->so_error = 0; 581 } else if (so->so_state & SS_CANTRCVMORE) 582 ; 583 else if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 584 && (so->so_proto->pr_flags & PR_CONNREQUIRED)) 585 error = ENOTCONN; 586 else 587 error = EWOULDBLOCK; 588 goto release; 589 } 590 /* 591 * On entry here, m points to the first record of the socket buffer. 592 * While we process the initial mbufs containing address and control 593 * info, we save a copy of m->m_nextpkt into nextrecord. 594 */ 595 if (curlwp != NULL) 596 curlwp->l_ru.ru_msgrcv++; 597 KASSERT(m == so->so_rcv.sb_mb); 598 SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); 599 SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); 600 nextrecord = m->m_nextpkt; 601 if (pr->pr_flags & PR_ADDR) { 602 #ifdef DIAGNOSTIC 603 if (m->m_type != MT_SONAME) 604 panic("receive 1a"); 605 #endif 606 sbfree(&so->so_rcv, m); 607 MFREE(m, so->so_rcv.sb_mb); 608 m = so->so_rcv.sb_mb; 609 } 610 while (m != NULL && m->m_type == MT_CONTROL && error == 0) { 611 sbfree(&so->so_rcv, m); 612 /* 613 * Dispose of any SCM_RIGHTS message that went 614 * through the read path rather than recv. 615 */ 616 if (pr->pr_domain->dom_dispose && 617 mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) 618 (*pr->pr_domain->dom_dispose)(m); 619 MFREE(m, so->so_rcv.sb_mb); 620 m = so->so_rcv.sb_mb; 621 } 622 623 /* 624 * If m is non-NULL, we have some data to read. From now on, 625 * make sure to keep sb_lastrecord consistent when working on 626 * the last packet on the chain (nextrecord == NULL) and we 627 * change m->m_nextpkt. 628 */ 629 if (m != NULL) { 630 m->m_nextpkt = nextrecord; 631 /* 632 * If nextrecord == NULL (this is a single chain), 633 * then sb_lastrecord may not be valid here if m 634 * was changed earlier. 635 */ 636 if (nextrecord == NULL) { 637 KASSERT(so->so_rcv.sb_mb == m); 638 so->so_rcv.sb_lastrecord = m; 639 } 640 type = m->m_type; 641 if (type == MT_OOBDATA) 642 flags |= MSG_OOB; 643 } else { 644 KASSERT(so->so_rcv.sb_mb == m); 645 so->so_rcv.sb_mb = nextrecord; 646 SB_EMPTY_FIXUP(&so->so_rcv); 647 } 648 SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); 649 SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); 650 651 while (m != NULL) { 652 if (m->m_type == MT_OOBDATA) { 653 if (type != MT_OOBDATA) 654 break; 655 } else if (type == MT_OOBDATA) 656 break; 657 #ifdef DIAGNOSTIC 658 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 659 panic("receive 3"); 660 #endif 661 so->so_state &= ~SS_RCVATMARK; 662 if (so->so_oobmark != 0 && so->so_oobmark < m->m_len) 663 break; 664 len = m->m_len; 665 /* 666 * mp is set, just pass back the mbufs. 667 * Sockbuf must be consistent here (points to current mbuf, 668 * it points to next record) when we drop priority; 669 * we must note any additions to the sockbuf when we 670 * block interrupts again. 671 */ 672 if (m->m_flags & M_EOR) 673 flags |= MSG_EOR; 674 nextrecord = m->m_nextpkt; 675 sbfree(&so->so_rcv, m); 676 *mp = m; 677 mp = &m->m_next; 678 so->so_rcv.sb_mb = m = m->m_next; 679 *mp = NULL; 680 /* 681 * If m != NULL, we also know that 682 * so->so_rcv.sb_mb != NULL. 683 */ 684 KASSERT(so->so_rcv.sb_mb == m); 685 if (m) { 686 m->m_nextpkt = nextrecord; 687 if (nextrecord == NULL) 688 so->so_rcv.sb_lastrecord = m; 689 } else { 690 so->so_rcv.sb_mb = nextrecord; 691 SB_EMPTY_FIXUP(&so->so_rcv); 692 } 693 SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); 694 SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); 695 if (so->so_oobmark) { 696 so->so_oobmark -= len; 697 if (so->so_oobmark == 0) { 698 so->so_state |= SS_RCVATMARK; 699 break; 700 } 701 } 702 if (flags & MSG_EOR) 703 break; 704 } 705 706 if (m != NULL) { 707 m_freem(*mp); 708 *mp = NULL; 709 error = ENOMEM; 710 (void) sbdroprecord(&so->so_rcv); 711 } else { 712 /* 713 * First part is an inline SB_EMPTY_FIXUP(). Second 714 * part makes sure sb_lastrecord is up-to-date if 715 * there is still data in the socket buffer. 716 */ 717 so->so_rcv.sb_mb = nextrecord; 718 if (so->so_rcv.sb_mb == NULL) { 719 so->so_rcv.sb_mbtail = NULL; 720 so->so_rcv.sb_lastrecord = NULL; 721 } else if (nextrecord->m_nextpkt == NULL) 722 so->so_rcv.sb_lastrecord = nextrecord; 723 } 724 SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); 725 SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); 726 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 727 (*pr->pr_usrreqs->pr_generic)(so, PRU_RCVD, NULL, 728 (struct mbuf *)(long)flags, NULL, curlwp); 729 if (*mp0 == NULL && (flags & MSG_EOR) == 0 && 730 (so->so_state & SS_CANTRCVMORE) == 0) { 731 sbunlock(&so->so_rcv); 732 goto restart; 733 } 734 735 release: 736 sbunlock(&so->so_rcv); 737 return error; 738 } 739 740 static struct socket * 741 gre_reconf(struct gre_softc *sc, const struct gre_soparm *newsoparm) 742 { 743 struct ifnet *ifp = &sc->sc_if; 744 745 GRE_DPRINTF(sc, "enter\n"); 746 747 shutdown: 748 if (sc->sc_soparm.sp_so != NULL) { 749 GRE_DPRINTF(sc, "\n"); 750 gre_upcall_remove(sc->sc_soparm.sp_so); 751 softint_disestablish(sc->sc_si); 752 sc->sc_si = NULL; 753 gre_fp_send(sc, GRE_M_DELFP, NULL); 754 gre_clearconf(&sc->sc_soparm, false); 755 } 756 757 if (newsoparm != NULL) { 758 GRE_DPRINTF(sc, "\n"); 759 sc->sc_soparm = *newsoparm; 760 newsoparm = NULL; 761 } 762 763 if (sc->sc_soparm.sp_so != NULL) { 764 GRE_DPRINTF(sc, "\n"); 765 sc->sc_si = softint_establish(SOFTINT_NET, greintr, sc); 766 gre_upcall_add(sc->sc_soparm.sp_so, sc); 767 if ((ifp->if_flags & IFF_UP) == 0) { 768 GRE_DPRINTF(sc, "down\n"); 769 goto shutdown; 770 } 771 } 772 773 GRE_DPRINTF(sc, "\n"); 774 if (sc->sc_soparm.sp_so != NULL) 775 sc->sc_if.if_flags |= IFF_RUNNING; 776 else { 777 gre_bufq_purge(&sc->sc_snd); 778 sc->sc_if.if_flags &= ~IFF_RUNNING; 779 } 780 return sc->sc_soparm.sp_so; 781 } 782 783 static int 784 gre_input(struct gre_softc *sc, struct mbuf *m, int hlen, 785 const struct gre_h *gh) 786 { 787 uint16_t flags; 788 uint32_t af; /* af passed to BPF tap */ 789 int isr, s; 790 struct ifqueue *ifq; 791 792 sc->sc_if.if_ipackets++; 793 sc->sc_if.if_ibytes += m->m_pkthdr.len; 794 795 hlen += sizeof(struct gre_h); 796 797 /* process GRE flags as packet can be of variable len */ 798 flags = ntohs(gh->flags); 799 800 /* Checksum & Offset are present */ 801 if ((flags & GRE_CP) | (flags & GRE_RP)) 802 hlen += 4; 803 /* We don't support routing fields (variable length) */ 804 if (flags & GRE_RP) { 805 sc->sc_if.if_ierrors++; 806 return 0; 807 } 808 if (flags & GRE_KP) 809 hlen += 4; 810 if (flags & GRE_SP) 811 hlen += 4; 812 813 switch (ntohs(gh->ptype)) { /* ethertypes */ 814 #ifdef INET 815 case ETHERTYPE_IP: 816 ifq = &ipintrq; 817 isr = NETISR_IP; 818 af = AF_INET; 819 break; 820 #endif 821 #ifdef NETATALK 822 case ETHERTYPE_ATALK: 823 ifq = &atintrq1; 824 isr = NETISR_ATALK; 825 af = AF_APPLETALK; 826 break; 827 #endif 828 #ifdef INET6 829 case ETHERTYPE_IPV6: 830 ifq = &ip6intrq; 831 isr = NETISR_IPV6; 832 af = AF_INET6; 833 break; 834 #endif 835 #ifdef MPLS 836 case ETHERTYPE_MPLS: 837 ifq = &mplsintrq; 838 isr = NETISR_MPLS; 839 af = AF_MPLS; 840 break; 841 #endif 842 default: /* others not yet supported */ 843 GRE_DPRINTF(sc, "unhandled ethertype 0x%04x\n", 844 ntohs(gh->ptype)); 845 sc->sc_if.if_noproto++; 846 return 0; 847 } 848 849 if (hlen > m->m_pkthdr.len) { 850 m_freem(m); 851 sc->sc_if.if_ierrors++; 852 return EINVAL; 853 } 854 m_adj(m, hlen); 855 856 bpf_mtap_af(&sc->sc_if, af, m); 857 858 m->m_pkthdr.rcvif = &sc->sc_if; 859 860 s = splnet(); 861 if (IF_QFULL(ifq)) { 862 IF_DROP(ifq); 863 m_freem(m); 864 } else { 865 IF_ENQUEUE(ifq, m); 866 } 867 /* we need schednetisr since the address family may change */ 868 schednetisr(isr); 869 splx(s); 870 871 return 1; /* packet is done, no further processing needed */ 872 } 873 874 /* 875 * The output routine. Takes a packet and encapsulates it in the protocol 876 * given by sc->sc_soparm.sp_proto. See also RFC 1701 and RFC 2004 877 */ 878 static int 879 gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 880 struct rtentry *rt) 881 { 882 int error = 0; 883 struct gre_softc *sc = ifp->if_softc; 884 struct gre_h *gh; 885 uint16_t etype = 0; 886 887 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 888 m_freem(m); 889 error = ENETDOWN; 890 goto end; 891 } 892 893 bpf_mtap_af(ifp, dst->sa_family, m); 894 895 m->m_flags &= ~(M_BCAST|M_MCAST); 896 897 GRE_DPRINTF(sc, "dst->sa_family=%d\n", dst->sa_family); 898 switch (dst->sa_family) { 899 #ifdef INET 900 case AF_INET: 901 /* TBD Extract the IP ToS field and set the 902 * encapsulating protocol's ToS to suit. 903 */ 904 etype = htons(ETHERTYPE_IP); 905 break; 906 #endif 907 #ifdef NETATALK 908 case AF_APPLETALK: 909 etype = htons(ETHERTYPE_ATALK); 910 break; 911 #endif 912 #ifdef INET6 913 case AF_INET6: 914 etype = htons(ETHERTYPE_IPV6); 915 break; 916 #endif 917 default: 918 IF_DROP(&ifp->if_snd); 919 m_freem(m); 920 error = EAFNOSUPPORT; 921 goto end; 922 } 923 924 #ifdef MPLS 925 if (rt != NULL && rt_gettag(rt) != NULL) { 926 union mpls_shim msh; 927 msh.s_addr = MPLS_GETSADDR(rt); 928 if (msh.shim.label != MPLS_LABEL_IMPLNULL) 929 etype = htons(ETHERTYPE_MPLS); 930 } 931 #endif 932 933 M_PREPEND(m, sizeof(*gh), M_DONTWAIT); 934 935 if (m == NULL) { 936 IF_DROP(&ifp->if_snd); 937 error = ENOBUFS; 938 goto end; 939 } 940 941 gh = mtod(m, struct gre_h *); 942 gh->flags = 0; 943 gh->ptype = etype; 944 /* XXX Need to handle IP ToS. Look at how I handle IP TTL. */ 945 946 ifp->if_opackets++; 947 ifp->if_obytes += m->m_pkthdr.len; 948 949 /* Clear checksum-offload flags. */ 950 m->m_pkthdr.csum_flags = 0; 951 m->m_pkthdr.csum_data = 0; 952 953 /* send it off */ 954 if ((error = gre_bufq_enqueue(&sc->sc_snd, m)) != 0) { 955 sc->sc_oflow_ev.ev_count++; 956 m_freem(m); 957 } else 958 softint_schedule(sc->sc_si); 959 end: 960 if (error) 961 ifp->if_oerrors++; 962 return error; 963 } 964 965 static int 966 gre_getname(struct socket *so, int req, struct mbuf *nam, struct lwp *l) 967 { 968 return (*so->so_proto->pr_usrreqs->pr_generic)(so, 969 req, NULL, nam, NULL, l); 970 } 971 972 static int 973 gre_getsockname(struct socket *so, struct mbuf *nam, struct lwp *l) 974 { 975 return gre_getname(so, PRU_SOCKADDR, nam, l); 976 } 977 978 static int 979 gre_getpeername(struct socket *so, struct mbuf *nam, struct lwp *l) 980 { 981 return gre_getname(so, PRU_PEERADDR, nam, l); 982 } 983 984 static int 985 gre_getnames(struct socket *so, struct lwp *l, struct sockaddr_storage *src, 986 struct sockaddr_storage *dst) 987 { 988 struct mbuf *m; 989 struct sockaddr_storage *ss; 990 int rc; 991 992 if ((m = getsombuf(so, MT_SONAME)) == NULL) 993 return ENOBUFS; 994 995 ss = mtod(m, struct sockaddr_storage *); 996 997 solock(so); 998 if ((rc = gre_getsockname(so, m, l)) != 0) 999 goto out; 1000 *src = *ss; 1001 1002 if ((rc = gre_getpeername(so, m, l)) != 0) 1003 goto out; 1004 *dst = *ss; 1005 out: 1006 sounlock(so); 1007 m_freem(m); 1008 return rc; 1009 } 1010 1011 static void 1012 gre_fp_recvloop(void *arg) 1013 { 1014 struct gre_softc *sc = arg; 1015 1016 mutex_enter(&sc->sc_mtx); 1017 while (gre_fp_recv(sc)) 1018 ; 1019 mutex_exit(&sc->sc_mtx); 1020 kthread_exit(0); 1021 } 1022 1023 static bool 1024 gre_fp_recv(struct gre_softc *sc) 1025 { 1026 int fd, ofd, rc; 1027 file_t *fp; 1028 1029 fp = sc->sc_fp; 1030 ofd = sc->sc_fd; 1031 fd = -1; 1032 1033 switch (sc->sc_msg) { 1034 case GRE_M_STOP: 1035 cv_signal(&sc->sc_fp_condvar); 1036 return false; 1037 case GRE_M_SETFP: 1038 mutex_exit(&sc->sc_mtx); 1039 rc = fd_dup(fp, 0, &fd, 0); 1040 mutex_enter(&sc->sc_mtx); 1041 if (rc != 0) { 1042 sc->sc_msg = GRE_M_ERR; 1043 break; 1044 } 1045 /*FALLTHROUGH*/ 1046 case GRE_M_DELFP: 1047 mutex_exit(&sc->sc_mtx); 1048 if (ofd != -1 && fd_getfile(ofd) != NULL) 1049 fd_close(ofd); 1050 mutex_enter(&sc->sc_mtx); 1051 sc->sc_fd = fd; 1052 sc->sc_msg = GRE_M_OK; 1053 break; 1054 default: 1055 gre_fp_wait(sc); 1056 return true; 1057 } 1058 cv_signal(&sc->sc_fp_condvar); 1059 return true; 1060 } 1061 1062 static bool 1063 gre_fp_send(struct gre_softc *sc, enum gre_msg msg, file_t *fp) 1064 { 1065 bool rc; 1066 1067 mutex_enter(&sc->sc_mtx); 1068 while (sc->sc_msg != GRE_M_NONE) 1069 gre_fp_wait(sc); 1070 sc->sc_fp = fp; 1071 sc->sc_msg = msg; 1072 cv_signal(&sc->sc_fp_condvar); 1073 while (sc->sc_msg != GRE_M_STOP && sc->sc_msg != GRE_M_OK && 1074 sc->sc_msg != GRE_M_ERR) 1075 gre_fp_wait(sc); 1076 rc = (sc->sc_msg != GRE_M_ERR); 1077 sc->sc_msg = GRE_M_NONE; 1078 cv_signal(&sc->sc_fp_condvar); 1079 mutex_exit(&sc->sc_mtx); 1080 return rc; 1081 } 1082 1083 static int 1084 gre_ssock(struct ifnet *ifp, struct gre_soparm *sp, int fd) 1085 { 1086 int error = 0; 1087 const struct protosw *pr; 1088 file_t *fp; 1089 struct gre_softc *sc = ifp->if_softc; 1090 struct socket *so; 1091 struct sockaddr_storage dst, src; 1092 1093 if ((fp = fd_getfile(fd)) == NULL) 1094 return EBADF; 1095 if (fp->f_type != DTYPE_SOCKET) { 1096 fd_putfile(fd); 1097 return ENOTSOCK; 1098 } 1099 1100 GRE_DPRINTF(sc, "\n"); 1101 1102 so = (struct socket *)fp->f_data; 1103 pr = so->so_proto; 1104 1105 GRE_DPRINTF(sc, "type %d, proto %d\n", pr->pr_type, pr->pr_protocol); 1106 1107 if ((pr->pr_flags & PR_ATOMIC) == 0 || 1108 (sp->sp_type != 0 && pr->pr_type != sp->sp_type) || 1109 (sp->sp_proto != 0 && pr->pr_protocol != 0 && 1110 pr->pr_protocol != sp->sp_proto)) { 1111 error = EINVAL; 1112 goto err; 1113 } 1114 1115 GRE_DPRINTF(sc, "\n"); 1116 1117 /* check address */ 1118 if ((error = gre_getnames(so, curlwp, &src, &dst)) != 0) 1119 goto err; 1120 1121 GRE_DPRINTF(sc, "\n"); 1122 1123 if (!gre_fp_send(sc, GRE_M_SETFP, fp)) { 1124 error = EBUSY; 1125 goto err; 1126 } 1127 1128 GRE_DPRINTF(sc, "\n"); 1129 1130 sp->sp_src = src; 1131 sp->sp_dst = dst; 1132 1133 sp->sp_so = so; 1134 1135 err: 1136 fd_putfile(fd); 1137 return error; 1138 } 1139 1140 static bool 1141 sockaddr_is_anyaddr(const struct sockaddr *sa) 1142 { 1143 socklen_t anylen, salen; 1144 const void *anyaddr, *addr; 1145 1146 if ((anyaddr = sockaddr_anyaddr(sa, &anylen)) == NULL || 1147 (addr = sockaddr_const_addr(sa, &salen)) == NULL) 1148 return false; 1149 1150 if (salen > anylen) 1151 return false; 1152 1153 return memcmp(anyaddr, addr, MIN(anylen, salen)) == 0; 1154 } 1155 1156 static bool 1157 gre_is_nullconf(const struct gre_soparm *sp) 1158 { 1159 return sockaddr_is_anyaddr(sstocsa(&sp->sp_src)) || 1160 sockaddr_is_anyaddr(sstocsa(&sp->sp_dst)); 1161 } 1162 1163 static void 1164 gre_clearconf(struct gre_soparm *sp, bool force) 1165 { 1166 if (sp->sp_bysock || force) { 1167 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1168 sockaddr_any(sstosa(&sp->sp_src))); 1169 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1170 sockaddr_any(sstosa(&sp->sp_dst))); 1171 sp->sp_bysock = false; 1172 } 1173 sp->sp_so = NULL; /* XXX */ 1174 } 1175 1176 static int 1177 gre_ioctl(struct ifnet *ifp, const u_long cmd, void *data) 1178 { 1179 struct ifreq *ifr; 1180 struct if_laddrreq *lifr = (struct if_laddrreq *)data; 1181 struct gre_softc *sc = ifp->if_softc; 1182 struct gre_soparm *sp; 1183 int fd, error = 0, oproto, otype, s; 1184 struct gre_soparm sp0; 1185 1186 ifr = data; 1187 1188 GRE_DPRINTF(sc, "cmd %lu\n", cmd); 1189 1190 switch (cmd) { 1191 case GRESPROTO: 1192 case GRESADDRD: 1193 case GRESADDRS: 1194 case GRESSOCK: 1195 case GREDSOCK: 1196 if (kauth_authorize_network(curlwp->l_cred, 1197 KAUTH_NETWORK_INTERFACE, 1198 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1199 NULL) != 0) 1200 return EPERM; 1201 break; 1202 default: 1203 break; 1204 } 1205 1206 s = splnet(); 1207 1208 sp0 = sc->sc_soparm; 1209 sp0.sp_so = NULL; 1210 sp = &sp0; 1211 1212 GRE_DPRINTF(sc, "\n"); 1213 1214 switch (cmd) { 1215 case SIOCINITIFADDR: 1216 GRE_DPRINTF(sc, "\n"); 1217 if ((ifp->if_flags & IFF_UP) != 0) 1218 break; 1219 gre_clearconf(sp, false); 1220 ifp->if_flags |= IFF_UP; 1221 goto mksocket; 1222 case SIOCSIFFLAGS: 1223 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1224 break; 1225 oproto = sp->sp_proto; 1226 otype = sp->sp_type; 1227 switch (ifr->ifr_flags & (IFF_LINK0|IFF_LINK2)) { 1228 case IFF_LINK0|IFF_LINK2: 1229 sp->sp_proto = IPPROTO_UDP; 1230 sp->sp_type = SOCK_DGRAM; 1231 break; 1232 case IFF_LINK2: 1233 sp->sp_proto = 0; 1234 sp->sp_type = 0; 1235 break; 1236 case IFF_LINK0: 1237 sp->sp_proto = IPPROTO_GRE; 1238 sp->sp_type = SOCK_RAW; 1239 break; 1240 default: 1241 GRE_DPRINTF(sc, "\n"); 1242 error = EINVAL; 1243 goto out; 1244 } 1245 GRE_DPRINTF(sc, "\n"); 1246 gre_clearconf(sp, false); 1247 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == 1248 (IFF_UP|IFF_RUNNING) && 1249 (oproto == sp->sp_proto || sp->sp_proto == 0) && 1250 (otype == sp->sp_type || sp->sp_type == 0)) 1251 break; 1252 switch (sp->sp_proto) { 1253 case IPPROTO_UDP: 1254 case IPPROTO_GRE: 1255 goto mksocket; 1256 default: 1257 break; 1258 } 1259 break; 1260 case SIOCSIFMTU: 1261 /* XXX determine MTU automatically by probing w/ 1262 * XXX do-not-fragment packets? 1263 */ 1264 if (ifr->ifr_mtu < 576) { 1265 error = EINVAL; 1266 break; 1267 } 1268 /*FALLTHROUGH*/ 1269 case SIOCGIFMTU: 1270 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1271 error = 0; 1272 break; 1273 case SIOCADDMULTI: 1274 case SIOCDELMULTI: 1275 if (ifr == NULL) { 1276 error = EAFNOSUPPORT; 1277 break; 1278 } 1279 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 1280 #ifdef INET 1281 case AF_INET: 1282 break; 1283 #endif 1284 #ifdef INET6 1285 case AF_INET6: 1286 break; 1287 #endif 1288 default: 1289 error = EAFNOSUPPORT; 1290 break; 1291 } 1292 break; 1293 case GRESPROTO: 1294 gre_clearconf(sp, false); 1295 oproto = sp->sp_proto; 1296 otype = sp->sp_type; 1297 sp->sp_proto = ifr->ifr_flags; 1298 switch (sp->sp_proto) { 1299 case IPPROTO_UDP: 1300 ifp->if_flags |= IFF_LINK0|IFF_LINK2; 1301 sp->sp_type = SOCK_DGRAM; 1302 break; 1303 case IPPROTO_GRE: 1304 ifp->if_flags |= IFF_LINK0; 1305 ifp->if_flags &= ~IFF_LINK2; 1306 sp->sp_type = SOCK_RAW; 1307 break; 1308 case 0: 1309 ifp->if_flags &= ~IFF_LINK0; 1310 ifp->if_flags |= IFF_LINK2; 1311 sp->sp_type = 0; 1312 break; 1313 default: 1314 error = EPROTONOSUPPORT; 1315 break; 1316 } 1317 if ((oproto == sp->sp_proto || sp->sp_proto == 0) && 1318 (otype == sp->sp_type || sp->sp_type == 0)) 1319 break; 1320 switch (sp->sp_proto) { 1321 case IPPROTO_UDP: 1322 case IPPROTO_GRE: 1323 goto mksocket; 1324 default: 1325 break; 1326 } 1327 break; 1328 case GREGPROTO: 1329 ifr->ifr_flags = sp->sp_proto; 1330 break; 1331 case GRESADDRS: 1332 case GRESADDRD: 1333 gre_clearconf(sp, false); 1334 /* set tunnel endpoints and mark interface as up */ 1335 switch (cmd) { 1336 case GRESADDRS: 1337 sockaddr_copy(sstosa(&sp->sp_src), 1338 sizeof(sp->sp_src), ifreq_getaddr(cmd, ifr)); 1339 break; 1340 case GRESADDRD: 1341 sockaddr_copy(sstosa(&sp->sp_dst), 1342 sizeof(sp->sp_dst), ifreq_getaddr(cmd, ifr)); 1343 break; 1344 } 1345 checkaddr: 1346 if (sockaddr_any(sstosa(&sp->sp_src)) == NULL || 1347 sockaddr_any(sstosa(&sp->sp_dst)) == NULL) { 1348 error = EINVAL; 1349 break; 1350 } 1351 /* let gre_socreate() check the rest */ 1352 mksocket: 1353 GRE_DPRINTF(sc, "\n"); 1354 /* If we're administratively down, or the configuration 1355 * is empty, there's no use creating a socket. 1356 */ 1357 if ((ifp->if_flags & IFF_UP) == 0 || gre_is_nullconf(sp)) 1358 goto sendconf; 1359 1360 GRE_DPRINTF(sc, "\n"); 1361 fd = 0; 1362 error = gre_socreate(sc, sp, &fd); 1363 if (error != 0) 1364 break; 1365 1366 setsock: 1367 GRE_DPRINTF(sc, "\n"); 1368 1369 error = gre_ssock(ifp, sp, fd); 1370 1371 if (cmd != GRESSOCK) { 1372 GRE_DPRINTF(sc, "\n"); 1373 /* XXX v. dodgy */ 1374 if (fd_getfile(fd) != NULL) 1375 fd_close(fd); 1376 } 1377 1378 if (error == 0) { 1379 sendconf: 1380 GRE_DPRINTF(sc, "\n"); 1381 ifp->if_flags &= ~IFF_RUNNING; 1382 gre_reconf(sc, sp); 1383 } 1384 1385 break; 1386 case GREGADDRS: 1387 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_src)); 1388 break; 1389 case GREGADDRD: 1390 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_dst)); 1391 break; 1392 case GREDSOCK: 1393 GRE_DPRINTF(sc, "\n"); 1394 if (sp->sp_bysock) 1395 ifp->if_flags &= ~IFF_UP; 1396 gre_clearconf(sp, false); 1397 goto mksocket; 1398 case GRESSOCK: 1399 GRE_DPRINTF(sc, "\n"); 1400 gre_clearconf(sp, true); 1401 fd = (int)ifr->ifr_value; 1402 sp->sp_bysock = true; 1403 ifp->if_flags |= IFF_UP; 1404 goto setsock; 1405 case SIOCSLIFPHYADDR: 1406 GRE_DPRINTF(sc, "\n"); 1407 if (lifr->addr.ss_family != lifr->dstaddr.ss_family) { 1408 error = EAFNOSUPPORT; 1409 break; 1410 } 1411 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1412 sstosa(&lifr->addr)); 1413 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1414 sstosa(&lifr->dstaddr)); 1415 GRE_DPRINTF(sc, "\n"); 1416 goto checkaddr; 1417 case SIOCDIFPHYADDR: 1418 GRE_DPRINTF(sc, "\n"); 1419 gre_clearconf(sp, true); 1420 ifp->if_flags &= ~IFF_UP; 1421 goto mksocket; 1422 case SIOCGLIFPHYADDR: 1423 GRE_DPRINTF(sc, "\n"); 1424 if (gre_is_nullconf(sp)) { 1425 error = EADDRNOTAVAIL; 1426 break; 1427 } 1428 sockaddr_copy(sstosa(&lifr->addr), sizeof(lifr->addr), 1429 sstosa(&sp->sp_src)); 1430 sockaddr_copy(sstosa(&lifr->dstaddr), sizeof(lifr->dstaddr), 1431 sstosa(&sp->sp_dst)); 1432 GRE_DPRINTF(sc, "\n"); 1433 break; 1434 default: 1435 error = ifioctl_common(ifp, cmd, data); 1436 break; 1437 } 1438 out: 1439 GRE_DPRINTF(sc, "\n"); 1440 splx(s); 1441 return error; 1442 } 1443 1444 void greattach(int); 1445 1446 /* ARGSUSED */ 1447 void 1448 greattach(int count) 1449 { 1450 if_clone_attach(&gre_cloner); 1451 } 1452
Indexes created Fri Oct 17 00:09:41 GMT 2025