if_gre.c revision 1.161.2.2
1 /* $NetBSD: if_gre.c,v 1.161.2.2 2015/06/06 14:40:25 skrll 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 1.161.2.2 2015/06/06 14:40:25 skrll 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 sockaddr *); 153 static int gre_getpeername(struct socket *, struct sockaddr *); 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 goto fail0; 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 if (rc) 306 goto fail1; 307 308 gre_evcnt_attach(sc); 309 310 gre_bufq_init(&sc->sc_snd, 17); 311 sc->sc_if.if_flags |= IFF_LINK0; 312 if_attach(&sc->sc_if); 313 if_alloc_sadl(&sc->sc_if); 314 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(uint32_t)); 315 return 0; 316 317 fail1: cv_destroy(&sc->sc_fp_condvar); 318 cv_destroy(&sc->sc_condvar); 319 mutex_destroy(&sc->sc_mtx); 320 free(sc, M_DEVBUF); 321 fail0: return -1; 322 } 323 324 static int 325 gre_clone_destroy(struct ifnet *ifp) 326 { 327 int s; 328 struct gre_softc *sc = ifp->if_softc; 329 330 GRE_DPRINTF(sc, "\n"); 331 332 bpf_detach(ifp); 333 s = splnet(); 334 if_detach(ifp); 335 336 GRE_DPRINTF(sc, "\n"); 337 /* Note that we must not hold the mutex while we call gre_reconf(). */ 338 gre_reconf(sc, NULL); 339 340 mutex_enter(&sc->sc_mtx); 341 sc->sc_msg = GRE_M_STOP; 342 cv_signal(&sc->sc_fp_condvar); 343 while (sc->sc_fp_waiters > 0) 344 cv_wait(&sc->sc_fp_condvar, &sc->sc_mtx); 345 mutex_exit(&sc->sc_mtx); 346 347 splx(s); 348 349 cv_destroy(&sc->sc_condvar); 350 cv_destroy(&sc->sc_fp_condvar); 351 mutex_destroy(&sc->sc_mtx); 352 gre_bufq_destroy(&sc->sc_snd); 353 gre_evcnt_detach(sc); 354 free(sc, M_DEVBUF); 355 356 return 0; 357 } 358 359 static void 360 gre_receive(struct socket *so, void *arg, int events, int waitflag) 361 { 362 struct gre_softc *sc = (struct gre_softc *)arg; 363 int rc; 364 const struct gre_h *gh; 365 struct mbuf *m; 366 367 GRE_DPRINTF(sc, "enter\n"); 368 369 sc->sc_recv_ev.ev_count++; 370 371 rc = gre_soreceive(so, &m); 372 /* TBD Back off if ECONNREFUSED (indicates 373 * ICMP Port Unreachable)? 374 */ 375 if (rc == EWOULDBLOCK) { 376 GRE_DPRINTF(sc, "EWOULDBLOCK\n"); 377 sc->sc_block_ev.ev_count++; 378 return; 379 } else if (rc != 0 || m == NULL) { 380 GRE_DPRINTF(sc, "%s: rc %d m %p\n", 381 sc->sc_if.if_xname, rc, (void *)m); 382 sc->sc_error_ev.ev_count++; 383 return; 384 } 385 if (m->m_len < sizeof(*gh) && (m = m_pullup(m, sizeof(*gh))) == NULL) { 386 GRE_DPRINTF(sc, "m_pullup failed\n"); 387 sc->sc_pullup_ev.ev_count++; 388 return; 389 } 390 gh = mtod(m, const struct gre_h *); 391 392 if (gre_input(sc, m, 0, gh) == 0) { 393 sc->sc_unsupp_ev.ev_count++; 394 GRE_DPRINTF(sc, "dropping unsupported\n"); 395 m_freem(m); 396 } 397 } 398 399 static void 400 gre_upcall_add(struct socket *so, void *arg) 401 { 402 /* XXX What if the kernel already set an upcall? */ 403 KASSERT((so->so_rcv.sb_flags & SB_UPCALL) == 0); 404 so->so_upcallarg = arg; 405 so->so_upcall = gre_receive; 406 so->so_rcv.sb_flags |= SB_UPCALL; 407 } 408 409 static void 410 gre_upcall_remove(struct socket *so) 411 { 412 so->so_rcv.sb_flags &= ~SB_UPCALL; 413 so->so_upcallarg = NULL; 414 so->so_upcall = NULL; 415 } 416 417 static int 418 gre_socreate(struct gre_softc *sc, const struct gre_soparm *sp, int *fdout) 419 { 420 int fd, rc; 421 struct socket *so; 422 struct sockaddr_big sbig; 423 sa_family_t af; 424 int val; 425 426 GRE_DPRINTF(sc, "enter\n"); 427 428 af = sp->sp_src.ss_family; 429 rc = fsocreate(af, NULL, sp->sp_type, sp->sp_proto, &fd); 430 if (rc != 0) { 431 GRE_DPRINTF(sc, "fsocreate failed\n"); 432 return rc; 433 } 434 435 if ((rc = fd_getsock(fd, &so)) != 0) 436 return rc; 437 438 memcpy(&sbig, &sp->sp_src, sizeof(sp->sp_src)); 439 if ((rc = sobind(so, (struct sockaddr *)&sbig, curlwp)) != 0) { 440 GRE_DPRINTF(sc, "sobind failed\n"); 441 goto out; 442 } 443 444 memcpy(&sbig, &sp->sp_dst, sizeof(sp->sp_dst)); 445 solock(so); 446 if ((rc = soconnect(so, (struct sockaddr *)&sbig, curlwp)) != 0) { 447 GRE_DPRINTF(sc, "soconnect failed\n"); 448 sounlock(so); 449 goto out; 450 } 451 sounlock(so); 452 453 /* XXX convert to a (new) SOL_SOCKET call */ 454 KASSERT(so->so_proto != NULL); 455 rc = so_setsockopt(curlwp, so, IPPROTO_IP, IP_TTL, 456 &ip_gre_ttl, sizeof(ip_gre_ttl)); 457 if (rc != 0) { 458 GRE_DPRINTF(sc, "so_setsockopt ttl failed\n"); 459 rc = 0; 460 } 461 462 val = 1; 463 rc = so_setsockopt(curlwp, so, SOL_SOCKET, SO_NOHEADER, 464 &val, sizeof(val)); 465 if (rc != 0) { 466 GRE_DPRINTF(sc, "so_setsockopt SO_NOHEADER failed\n"); 467 rc = 0; 468 } 469 out: 470 if (rc != 0) 471 fd_close(fd); 472 else { 473 fd_putfile(fd); 474 *fdout = fd; 475 } 476 477 return rc; 478 } 479 480 static int 481 gre_sosend(struct socket *so, struct mbuf *top) 482 { 483 struct proc *p; 484 long space, resid; 485 int error; 486 struct lwp * const l = curlwp; 487 488 p = l->l_proc; 489 490 resid = top->m_pkthdr.len; 491 if (p) 492 l->l_ru.ru_msgsnd++; 493 #define snderr(errno) { error = errno; goto release; } 494 495 solock(so); 496 if ((error = sblock(&so->so_snd, M_NOWAIT)) != 0) 497 goto out; 498 if (so->so_state & SS_CANTSENDMORE) 499 snderr(EPIPE); 500 if (so->so_error) { 501 error = so->so_error; 502 so->so_error = 0; 503 goto release; 504 } 505 if ((so->so_state & SS_ISCONNECTED) == 0) { 506 if (so->so_proto->pr_flags & PR_CONNREQUIRED) { 507 snderr(ENOTCONN); 508 } else { 509 snderr(EDESTADDRREQ); 510 } 511 } 512 space = sbspace(&so->so_snd); 513 if (resid > so->so_snd.sb_hiwat) 514 snderr(EMSGSIZE); 515 if (space < resid) 516 snderr(EWOULDBLOCK); 517 /* 518 * Data is prepackaged in "top". 519 */ 520 if (so->so_state & SS_CANTSENDMORE) 521 snderr(EPIPE); 522 error = (*so->so_proto->pr_usrreqs->pr_send)(so, 523 top, NULL, NULL, l); 524 top = NULL; 525 release: 526 sbunlock(&so->so_snd); 527 out: 528 sounlock(so); 529 if (top != NULL) 530 m_freem(top); 531 return error; 532 } 533 534 /* This is a stripped-down version of soreceive() that will never 535 * block. It will support SOCK_DGRAM sockets. It may also support 536 * SOCK_SEQPACKET sockets. 537 */ 538 static int 539 gre_soreceive(struct socket *so, struct mbuf **mp0) 540 { 541 struct mbuf *m, **mp; 542 int flags, len, error, type; 543 const struct protosw *pr; 544 struct mbuf *nextrecord; 545 546 KASSERT(mp0 != NULL); 547 548 flags = MSG_DONTWAIT; 549 pr = so->so_proto; 550 mp = mp0; 551 type = 0; 552 553 *mp = NULL; 554 555 KASSERT(pr->pr_flags & PR_ATOMIC); 556 restart: 557 if ((error = sblock(&so->so_rcv, M_NOWAIT)) != 0) { 558 return error; 559 } 560 m = so->so_rcv.sb_mb; 561 /* 562 * If we have less data than requested, do not block awaiting more. 563 */ 564 if (m == NULL) { 565 #ifdef DIAGNOSTIC 566 if (so->so_rcv.sb_cc) 567 panic("receive 1"); 568 #endif 569 if (so->so_error) { 570 error = so->so_error; 571 so->so_error = 0; 572 } else if (so->so_state & SS_CANTRCVMORE) 573 ; 574 else if ((so->so_state & (SS_ISCONNECTED|SS_ISCONNECTING)) == 0 575 && (so->so_proto->pr_flags & PR_CONNREQUIRED)) 576 error = ENOTCONN; 577 else 578 error = EWOULDBLOCK; 579 goto release; 580 } 581 /* 582 * On entry here, m points to the first record of the socket buffer. 583 * While we process the initial mbufs containing address and control 584 * info, we save a copy of m->m_nextpkt into nextrecord. 585 */ 586 if (curlwp != NULL) 587 curlwp->l_ru.ru_msgrcv++; 588 KASSERT(m == so->so_rcv.sb_mb); 589 SBLASTRECORDCHK(&so->so_rcv, "soreceive 1"); 590 SBLASTMBUFCHK(&so->so_rcv, "soreceive 1"); 591 nextrecord = m->m_nextpkt; 592 if (pr->pr_flags & PR_ADDR) { 593 #ifdef DIAGNOSTIC 594 if (m->m_type != MT_SONAME) 595 panic("receive 1a"); 596 #endif 597 sbfree(&so->so_rcv, m); 598 MFREE(m, so->so_rcv.sb_mb); 599 m = so->so_rcv.sb_mb; 600 } 601 while (m != NULL && m->m_type == MT_CONTROL && error == 0) { 602 sbfree(&so->so_rcv, m); 603 /* 604 * Dispose of any SCM_RIGHTS message that went 605 * through the read path rather than recv. 606 */ 607 if (pr->pr_domain->dom_dispose && 608 mtod(m, struct cmsghdr *)->cmsg_type == SCM_RIGHTS) 609 (*pr->pr_domain->dom_dispose)(m); 610 MFREE(m, so->so_rcv.sb_mb); 611 m = so->so_rcv.sb_mb; 612 } 613 614 /* 615 * If m is non-NULL, we have some data to read. From now on, 616 * make sure to keep sb_lastrecord consistent when working on 617 * the last packet on the chain (nextrecord == NULL) and we 618 * change m->m_nextpkt. 619 */ 620 if (m != NULL) { 621 m->m_nextpkt = nextrecord; 622 /* 623 * If nextrecord == NULL (this is a single chain), 624 * then sb_lastrecord may not be valid here if m 625 * was changed earlier. 626 */ 627 if (nextrecord == NULL) { 628 KASSERT(so->so_rcv.sb_mb == m); 629 so->so_rcv.sb_lastrecord = m; 630 } 631 type = m->m_type; 632 if (type == MT_OOBDATA) 633 flags |= MSG_OOB; 634 } else { 635 KASSERT(so->so_rcv.sb_mb == m); 636 so->so_rcv.sb_mb = nextrecord; 637 SB_EMPTY_FIXUP(&so->so_rcv); 638 } 639 SBLASTRECORDCHK(&so->so_rcv, "soreceive 2"); 640 SBLASTMBUFCHK(&so->so_rcv, "soreceive 2"); 641 642 while (m != NULL) { 643 if (m->m_type == MT_OOBDATA) { 644 if (type != MT_OOBDATA) 645 break; 646 } else if (type == MT_OOBDATA) 647 break; 648 #ifdef DIAGNOSTIC 649 else if (m->m_type != MT_DATA && m->m_type != MT_HEADER) 650 panic("receive 3"); 651 #endif 652 so->so_state &= ~SS_RCVATMARK; 653 if (so->so_oobmark != 0 && so->so_oobmark < m->m_len) 654 break; 655 len = m->m_len; 656 /* 657 * mp is set, just pass back the mbufs. 658 * Sockbuf must be consistent here (points to current mbuf, 659 * it points to next record) when we drop priority; 660 * we must note any additions to the sockbuf when we 661 * block interrupts again. 662 */ 663 if (m->m_flags & M_EOR) 664 flags |= MSG_EOR; 665 nextrecord = m->m_nextpkt; 666 sbfree(&so->so_rcv, m); 667 *mp = m; 668 mp = &m->m_next; 669 so->so_rcv.sb_mb = m = m->m_next; 670 *mp = NULL; 671 /* 672 * If m != NULL, we also know that 673 * so->so_rcv.sb_mb != NULL. 674 */ 675 KASSERT(so->so_rcv.sb_mb == m); 676 if (m) { 677 m->m_nextpkt = nextrecord; 678 if (nextrecord == NULL) 679 so->so_rcv.sb_lastrecord = m; 680 } else { 681 so->so_rcv.sb_mb = nextrecord; 682 SB_EMPTY_FIXUP(&so->so_rcv); 683 } 684 SBLASTRECORDCHK(&so->so_rcv, "soreceive 3"); 685 SBLASTMBUFCHK(&so->so_rcv, "soreceive 3"); 686 if (so->so_oobmark) { 687 so->so_oobmark -= len; 688 if (so->so_oobmark == 0) { 689 so->so_state |= SS_RCVATMARK; 690 break; 691 } 692 } 693 if (flags & MSG_EOR) 694 break; 695 } 696 697 if (m != NULL) { 698 m_freem(*mp); 699 *mp = NULL; 700 error = ENOMEM; 701 (void) sbdroprecord(&so->so_rcv); 702 } else { 703 /* 704 * First part is an inline SB_EMPTY_FIXUP(). Second 705 * part makes sure sb_lastrecord is up-to-date if 706 * there is still data in the socket buffer. 707 */ 708 so->so_rcv.sb_mb = nextrecord; 709 if (so->so_rcv.sb_mb == NULL) { 710 so->so_rcv.sb_mbtail = NULL; 711 so->so_rcv.sb_lastrecord = NULL; 712 } else if (nextrecord->m_nextpkt == NULL) 713 so->so_rcv.sb_lastrecord = nextrecord; 714 } 715 SBLASTRECORDCHK(&so->so_rcv, "soreceive 4"); 716 SBLASTMBUFCHK(&so->so_rcv, "soreceive 4"); 717 if (pr->pr_flags & PR_WANTRCVD && so->so_pcb) 718 (*pr->pr_usrreqs->pr_rcvd)(so, flags, curlwp); 719 if (*mp0 == NULL && (flags & MSG_EOR) == 0 && 720 (so->so_state & SS_CANTRCVMORE) == 0) { 721 sbunlock(&so->so_rcv); 722 goto restart; 723 } 724 725 release: 726 sbunlock(&so->so_rcv); 727 return error; 728 } 729 730 static struct socket * 731 gre_reconf(struct gre_softc *sc, const struct gre_soparm *newsoparm) 732 { 733 struct ifnet *ifp = &sc->sc_if; 734 735 GRE_DPRINTF(sc, "enter\n"); 736 737 shutdown: 738 if (sc->sc_soparm.sp_so != NULL) { 739 GRE_DPRINTF(sc, "\n"); 740 gre_upcall_remove(sc->sc_soparm.sp_so); 741 softint_disestablish(sc->sc_si); 742 sc->sc_si = NULL; 743 gre_fp_send(sc, GRE_M_DELFP, NULL); 744 gre_clearconf(&sc->sc_soparm, false); 745 } 746 747 if (newsoparm != NULL) { 748 GRE_DPRINTF(sc, "\n"); 749 sc->sc_soparm = *newsoparm; 750 newsoparm = NULL; 751 } 752 753 if (sc->sc_soparm.sp_so != NULL) { 754 GRE_DPRINTF(sc, "\n"); 755 sc->sc_si = softint_establish(SOFTINT_NET, greintr, sc); 756 gre_upcall_add(sc->sc_soparm.sp_so, sc); 757 if ((ifp->if_flags & IFF_UP) == 0) { 758 GRE_DPRINTF(sc, "down\n"); 759 goto shutdown; 760 } 761 } 762 763 GRE_DPRINTF(sc, "\n"); 764 if (sc->sc_soparm.sp_so != NULL) 765 sc->sc_if.if_flags |= IFF_RUNNING; 766 else { 767 gre_bufq_purge(&sc->sc_snd); 768 sc->sc_if.if_flags &= ~IFF_RUNNING; 769 } 770 return sc->sc_soparm.sp_so; 771 } 772 773 static int 774 gre_input(struct gre_softc *sc, struct mbuf *m, int hlen, 775 const struct gre_h *gh) 776 { 777 pktqueue_t *pktq = NULL; 778 struct ifqueue *ifq = NULL; 779 uint16_t flags; 780 uint32_t af; /* af passed to BPF tap */ 781 int isr = 0, s; 782 783 sc->sc_if.if_ipackets++; 784 sc->sc_if.if_ibytes += m->m_pkthdr.len; 785 786 hlen += sizeof(struct gre_h); 787 788 /* process GRE flags as packet can be of variable len */ 789 flags = ntohs(gh->flags); 790 791 /* Checksum & Offset are present */ 792 if ((flags & GRE_CP) | (flags & GRE_RP)) 793 hlen += 4; 794 /* We don't support routing fields (variable length) */ 795 if (flags & GRE_RP) { 796 sc->sc_if.if_ierrors++; 797 return 0; 798 } 799 if (flags & GRE_KP) 800 hlen += 4; 801 if (flags & GRE_SP) 802 hlen += 4; 803 804 switch (ntohs(gh->ptype)) { /* ethertypes */ 805 #ifdef INET 806 case ETHERTYPE_IP: 807 pktq = ip_pktq; 808 af = AF_INET; 809 break; 810 #endif 811 #ifdef NETATALK 812 case ETHERTYPE_ATALK: 813 ifq = &atintrq1; 814 isr = NETISR_ATALK; 815 af = AF_APPLETALK; 816 break; 817 #endif 818 #ifdef INET6 819 case ETHERTYPE_IPV6: 820 pktq = ip6_pktq; 821 af = AF_INET6; 822 break; 823 #endif 824 #ifdef MPLS 825 case ETHERTYPE_MPLS: 826 ifq = &mplsintrq; 827 isr = NETISR_MPLS; 828 af = AF_MPLS; 829 break; 830 #endif 831 default: /* others not yet supported */ 832 GRE_DPRINTF(sc, "unhandled ethertype 0x%04x\n", 833 ntohs(gh->ptype)); 834 sc->sc_if.if_noproto++; 835 return 0; 836 } 837 838 if (hlen > m->m_pkthdr.len) { 839 m_freem(m); 840 sc->sc_if.if_ierrors++; 841 return EINVAL; 842 } 843 m_adj(m, hlen); 844 845 bpf_mtap_af(&sc->sc_if, af, m); 846 847 m->m_pkthdr.rcvif = &sc->sc_if; 848 849 if (__predict_true(pktq)) { 850 if (__predict_false(!pktq_enqueue(pktq, m, 0))) { 851 m_freem(m); 852 } 853 return 1; 854 } 855 856 s = splnet(); 857 if (IF_QFULL(ifq)) { 858 IF_DROP(ifq); 859 m_freem(m); 860 } else { 861 IF_ENQUEUE(ifq, m); 862 } 863 /* we need schednetisr since the address family may change */ 864 schednetisr(isr); 865 splx(s); 866 867 return 1; /* packet is done, no further processing needed */ 868 } 869 870 /* 871 * The output routine. Takes a packet and encapsulates it in the protocol 872 * given by sc->sc_soparm.sp_proto. See also RFC 1701 and RFC 2004 873 */ 874 static int 875 gre_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 876 struct rtentry *rt) 877 { 878 int error = 0; 879 struct gre_softc *sc = ifp->if_softc; 880 struct gre_h *gh; 881 uint16_t etype = 0; 882 883 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { 884 m_freem(m); 885 error = ENETDOWN; 886 goto end; 887 } 888 889 bpf_mtap_af(ifp, dst->sa_family, m); 890 891 m->m_flags &= ~(M_BCAST|M_MCAST); 892 893 GRE_DPRINTF(sc, "dst->sa_family=%d\n", dst->sa_family); 894 switch (dst->sa_family) { 895 #ifdef INET 896 case AF_INET: 897 /* TBD Extract the IP ToS field and set the 898 * encapsulating protocol's ToS to suit. 899 */ 900 etype = htons(ETHERTYPE_IP); 901 break; 902 #endif 903 #ifdef NETATALK 904 case AF_APPLETALK: 905 etype = htons(ETHERTYPE_ATALK); 906 break; 907 #endif 908 #ifdef INET6 909 case AF_INET6: 910 etype = htons(ETHERTYPE_IPV6); 911 break; 912 #endif 913 default: 914 IF_DROP(&ifp->if_snd); 915 m_freem(m); 916 error = EAFNOSUPPORT; 917 goto end; 918 } 919 920 #ifdef MPLS 921 if (rt != NULL && rt_gettag(rt) != NULL) { 922 union mpls_shim msh; 923 msh.s_addr = MPLS_GETSADDR(rt); 924 if (msh.shim.label != MPLS_LABEL_IMPLNULL) 925 etype = htons(ETHERTYPE_MPLS); 926 } 927 #endif 928 929 M_PREPEND(m, sizeof(*gh), M_DONTWAIT); 930 931 if (m == NULL) { 932 IF_DROP(&ifp->if_snd); 933 error = ENOBUFS; 934 goto end; 935 } 936 937 gh = mtod(m, struct gre_h *); 938 gh->flags = 0; 939 gh->ptype = etype; 940 /* XXX Need to handle IP ToS. Look at how I handle IP TTL. */ 941 942 ifp->if_opackets++; 943 ifp->if_obytes += m->m_pkthdr.len; 944 945 /* Clear checksum-offload flags. */ 946 m->m_pkthdr.csum_flags = 0; 947 m->m_pkthdr.csum_data = 0; 948 949 /* send it off */ 950 if ((error = gre_bufq_enqueue(&sc->sc_snd, m)) != 0) { 951 sc->sc_oflow_ev.ev_count++; 952 m_freem(m); 953 } else 954 softint_schedule(sc->sc_si); 955 end: 956 if (error) 957 ifp->if_oerrors++; 958 return error; 959 } 960 961 static int 962 gre_getsockname(struct socket *so, struct sockaddr *nam) 963 { 964 return (*so->so_proto->pr_usrreqs->pr_sockaddr)(so, nam); 965 } 966 967 static int 968 gre_getpeername(struct socket *so, struct sockaddr *nam) 969 { 970 return (*so->so_proto->pr_usrreqs->pr_peeraddr)(so, nam); 971 } 972 973 static int 974 gre_getnames(struct socket *so, struct lwp *l, struct sockaddr_storage *src, 975 struct sockaddr_storage *dst) 976 { 977 struct sockaddr_storage ss; 978 int rc; 979 980 solock(so); 981 if ((rc = gre_getsockname(so, (struct sockaddr *)&ss)) != 0) 982 goto out; 983 *src = ss; 984 985 if ((rc = gre_getpeername(so, (struct sockaddr *)&ss)) != 0) 986 goto out; 987 *dst = ss; 988 out: 989 sounlock(so); 990 return rc; 991 } 992 993 static void 994 gre_fp_recvloop(void *arg) 995 { 996 struct gre_softc *sc = arg; 997 998 mutex_enter(&sc->sc_mtx); 999 while (gre_fp_recv(sc)) 1000 ; 1001 mutex_exit(&sc->sc_mtx); 1002 kthread_exit(0); 1003 } 1004 1005 static bool 1006 gre_fp_recv(struct gre_softc *sc) 1007 { 1008 int fd, ofd, rc; 1009 file_t *fp; 1010 1011 fp = sc->sc_fp; 1012 ofd = sc->sc_fd; 1013 fd = -1; 1014 1015 switch (sc->sc_msg) { 1016 case GRE_M_STOP: 1017 cv_signal(&sc->sc_fp_condvar); 1018 return false; 1019 case GRE_M_SETFP: 1020 mutex_exit(&sc->sc_mtx); 1021 rc = fd_dup(fp, 0, &fd, 0); 1022 mutex_enter(&sc->sc_mtx); 1023 if (rc != 0) { 1024 sc->sc_msg = GRE_M_ERR; 1025 break; 1026 } 1027 /*FALLTHROUGH*/ 1028 case GRE_M_DELFP: 1029 mutex_exit(&sc->sc_mtx); 1030 if (ofd != -1 && fd_getfile(ofd) != NULL) 1031 fd_close(ofd); 1032 mutex_enter(&sc->sc_mtx); 1033 sc->sc_fd = fd; 1034 sc->sc_msg = GRE_M_OK; 1035 break; 1036 default: 1037 gre_fp_wait(sc); 1038 return true; 1039 } 1040 cv_signal(&sc->sc_fp_condvar); 1041 return true; 1042 } 1043 1044 static bool 1045 gre_fp_send(struct gre_softc *sc, enum gre_msg msg, file_t *fp) 1046 { 1047 bool rc; 1048 1049 mutex_enter(&sc->sc_mtx); 1050 while (sc->sc_msg != GRE_M_NONE) 1051 gre_fp_wait(sc); 1052 sc->sc_fp = fp; 1053 sc->sc_msg = msg; 1054 cv_signal(&sc->sc_fp_condvar); 1055 while (sc->sc_msg != GRE_M_STOP && sc->sc_msg != GRE_M_OK && 1056 sc->sc_msg != GRE_M_ERR) 1057 gre_fp_wait(sc); 1058 rc = (sc->sc_msg != GRE_M_ERR); 1059 sc->sc_msg = GRE_M_NONE; 1060 cv_signal(&sc->sc_fp_condvar); 1061 mutex_exit(&sc->sc_mtx); 1062 return rc; 1063 } 1064 1065 static int 1066 gre_ssock(struct ifnet *ifp, struct gre_soparm *sp, int fd) 1067 { 1068 int error = 0; 1069 const struct protosw *pr; 1070 file_t *fp; 1071 struct gre_softc *sc = ifp->if_softc; 1072 struct socket *so; 1073 struct sockaddr_storage dst, src; 1074 1075 if ((fp = fd_getfile(fd)) == NULL) 1076 return EBADF; 1077 if (fp->f_type != DTYPE_SOCKET) { 1078 fd_putfile(fd); 1079 return ENOTSOCK; 1080 } 1081 1082 GRE_DPRINTF(sc, "\n"); 1083 1084 so = fp->f_socket; 1085 pr = so->so_proto; 1086 1087 GRE_DPRINTF(sc, "type %d, proto %d\n", pr->pr_type, pr->pr_protocol); 1088 1089 if ((pr->pr_flags & PR_ATOMIC) == 0 || 1090 (sp->sp_type != 0 && pr->pr_type != sp->sp_type) || 1091 (sp->sp_proto != 0 && pr->pr_protocol != 0 && 1092 pr->pr_protocol != sp->sp_proto)) { 1093 error = EINVAL; 1094 goto err; 1095 } 1096 1097 GRE_DPRINTF(sc, "\n"); 1098 1099 /* check address */ 1100 if ((error = gre_getnames(so, curlwp, &src, &dst)) != 0) 1101 goto err; 1102 1103 GRE_DPRINTF(sc, "\n"); 1104 1105 if (!gre_fp_send(sc, GRE_M_SETFP, fp)) { 1106 error = EBUSY; 1107 goto err; 1108 } 1109 1110 GRE_DPRINTF(sc, "\n"); 1111 1112 sp->sp_src = src; 1113 sp->sp_dst = dst; 1114 1115 sp->sp_so = so; 1116 1117 err: 1118 fd_putfile(fd); 1119 return error; 1120 } 1121 1122 static bool 1123 sockaddr_is_anyaddr(const struct sockaddr *sa) 1124 { 1125 socklen_t anylen, salen; 1126 const void *anyaddr, *addr; 1127 1128 if ((anyaddr = sockaddr_anyaddr(sa, &anylen)) == NULL || 1129 (addr = sockaddr_const_addr(sa, &salen)) == NULL) 1130 return false; 1131 1132 if (salen > anylen) 1133 return false; 1134 1135 return memcmp(anyaddr, addr, MIN(anylen, salen)) == 0; 1136 } 1137 1138 static bool 1139 gre_is_nullconf(const struct gre_soparm *sp) 1140 { 1141 return sockaddr_is_anyaddr(sstocsa(&sp->sp_src)) || 1142 sockaddr_is_anyaddr(sstocsa(&sp->sp_dst)); 1143 } 1144 1145 static void 1146 gre_clearconf(struct gre_soparm *sp, bool force) 1147 { 1148 if (sp->sp_bysock || force) { 1149 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1150 sockaddr_any(sstosa(&sp->sp_src))); 1151 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1152 sockaddr_any(sstosa(&sp->sp_dst))); 1153 sp->sp_bysock = false; 1154 } 1155 sp->sp_so = NULL; /* XXX */ 1156 } 1157 1158 static int 1159 gre_ioctl(struct ifnet *ifp, const u_long cmd, void *data) 1160 { 1161 struct ifreq *ifr; 1162 struct ifaddr *ifa = (struct ifaddr *)data; 1163 struct if_laddrreq *lifr = (struct if_laddrreq *)data; 1164 struct gre_softc *sc = ifp->if_softc; 1165 struct gre_soparm *sp; 1166 int fd, error = 0, oproto, otype, s; 1167 struct gre_soparm sp0; 1168 1169 ifr = data; 1170 1171 GRE_DPRINTF(sc, "cmd %lu\n", cmd); 1172 1173 switch (cmd) { 1174 case GRESPROTO: 1175 case GRESADDRD: 1176 case GRESADDRS: 1177 case GRESSOCK: 1178 case GREDSOCK: 1179 if (kauth_authorize_network(curlwp->l_cred, 1180 KAUTH_NETWORK_INTERFACE, 1181 KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd, 1182 NULL) != 0) 1183 return EPERM; 1184 break; 1185 default: 1186 break; 1187 } 1188 1189 s = splnet(); 1190 1191 sp0 = sc->sc_soparm; 1192 sp0.sp_so = NULL; 1193 sp = &sp0; 1194 1195 GRE_DPRINTF(sc, "\n"); 1196 1197 switch (cmd) { 1198 case SIOCINITIFADDR: 1199 GRE_DPRINTF(sc, "\n"); 1200 if ((ifp->if_flags & IFF_UP) != 0) 1201 break; 1202 gre_clearconf(sp, false); 1203 ifp->if_flags |= IFF_UP; 1204 ifa->ifa_rtrequest = p2p_rtrequest; 1205 goto mksocket; 1206 case SIOCSIFFLAGS: 1207 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 1208 break; 1209 oproto = sp->sp_proto; 1210 otype = sp->sp_type; 1211 switch (ifr->ifr_flags & (IFF_LINK0|IFF_LINK2)) { 1212 case IFF_LINK0|IFF_LINK2: 1213 sp->sp_proto = IPPROTO_UDP; 1214 sp->sp_type = SOCK_DGRAM; 1215 break; 1216 case IFF_LINK2: 1217 sp->sp_proto = 0; 1218 sp->sp_type = 0; 1219 break; 1220 case IFF_LINK0: 1221 sp->sp_proto = IPPROTO_GRE; 1222 sp->sp_type = SOCK_RAW; 1223 break; 1224 default: 1225 GRE_DPRINTF(sc, "\n"); 1226 error = EINVAL; 1227 goto out; 1228 } 1229 GRE_DPRINTF(sc, "\n"); 1230 gre_clearconf(sp, false); 1231 if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) == 1232 (IFF_UP|IFF_RUNNING) && 1233 (oproto == sp->sp_proto || sp->sp_proto == 0) && 1234 (otype == sp->sp_type || sp->sp_type == 0)) 1235 break; 1236 switch (sp->sp_proto) { 1237 case IPPROTO_UDP: 1238 case IPPROTO_GRE: 1239 goto mksocket; 1240 default: 1241 break; 1242 } 1243 break; 1244 case SIOCSIFMTU: 1245 /* XXX determine MTU automatically by probing w/ 1246 * XXX do-not-fragment packets? 1247 */ 1248 if (ifr->ifr_mtu < 576) { 1249 error = EINVAL; 1250 break; 1251 } 1252 /*FALLTHROUGH*/ 1253 case SIOCGIFMTU: 1254 if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET) 1255 error = 0; 1256 break; 1257 case SIOCADDMULTI: 1258 case SIOCDELMULTI: 1259 if (ifr == NULL) { 1260 error = EAFNOSUPPORT; 1261 break; 1262 } 1263 switch (ifreq_getaddr(cmd, ifr)->sa_family) { 1264 #ifdef INET 1265 case AF_INET: 1266 break; 1267 #endif 1268 #ifdef INET6 1269 case AF_INET6: 1270 break; 1271 #endif 1272 default: 1273 error = EAFNOSUPPORT; 1274 break; 1275 } 1276 break; 1277 case GRESPROTO: 1278 gre_clearconf(sp, false); 1279 oproto = sp->sp_proto; 1280 otype = sp->sp_type; 1281 sp->sp_proto = ifr->ifr_flags; 1282 switch (sp->sp_proto) { 1283 case IPPROTO_UDP: 1284 ifp->if_flags |= IFF_LINK0|IFF_LINK2; 1285 sp->sp_type = SOCK_DGRAM; 1286 break; 1287 case IPPROTO_GRE: 1288 ifp->if_flags |= IFF_LINK0; 1289 ifp->if_flags &= ~IFF_LINK2; 1290 sp->sp_type = SOCK_RAW; 1291 break; 1292 case 0: 1293 ifp->if_flags &= ~IFF_LINK0; 1294 ifp->if_flags |= IFF_LINK2; 1295 sp->sp_type = 0; 1296 break; 1297 default: 1298 error = EPROTONOSUPPORT; 1299 break; 1300 } 1301 if ((oproto == sp->sp_proto || sp->sp_proto == 0) && 1302 (otype == sp->sp_type || sp->sp_type == 0)) 1303 break; 1304 switch (sp->sp_proto) { 1305 case IPPROTO_UDP: 1306 case IPPROTO_GRE: 1307 goto mksocket; 1308 default: 1309 break; 1310 } 1311 break; 1312 case GREGPROTO: 1313 ifr->ifr_flags = sp->sp_proto; 1314 break; 1315 case GRESADDRS: 1316 case GRESADDRD: 1317 gre_clearconf(sp, false); 1318 /* set tunnel endpoints and mark interface as up */ 1319 switch (cmd) { 1320 case GRESADDRS: 1321 sockaddr_copy(sstosa(&sp->sp_src), 1322 sizeof(sp->sp_src), ifreq_getaddr(cmd, ifr)); 1323 break; 1324 case GRESADDRD: 1325 sockaddr_copy(sstosa(&sp->sp_dst), 1326 sizeof(sp->sp_dst), ifreq_getaddr(cmd, ifr)); 1327 break; 1328 } 1329 checkaddr: 1330 if (sockaddr_any(sstosa(&sp->sp_src)) == NULL || 1331 sockaddr_any(sstosa(&sp->sp_dst)) == NULL) { 1332 error = EINVAL; 1333 break; 1334 } 1335 /* let gre_socreate() check the rest */ 1336 mksocket: 1337 GRE_DPRINTF(sc, "\n"); 1338 /* If we're administratively down, or the configuration 1339 * is empty, there's no use creating a socket. 1340 */ 1341 if ((ifp->if_flags & IFF_UP) == 0 || gre_is_nullconf(sp)) 1342 goto sendconf; 1343 1344 GRE_DPRINTF(sc, "\n"); 1345 fd = 0; 1346 error = gre_socreate(sc, sp, &fd); 1347 if (error != 0) 1348 break; 1349 1350 setsock: 1351 GRE_DPRINTF(sc, "\n"); 1352 1353 error = gre_ssock(ifp, sp, fd); 1354 1355 if (cmd != GRESSOCK) { 1356 GRE_DPRINTF(sc, "\n"); 1357 /* XXX v. dodgy */ 1358 if (fd_getfile(fd) != NULL) 1359 fd_close(fd); 1360 } 1361 1362 if (error == 0) { 1363 sendconf: 1364 GRE_DPRINTF(sc, "\n"); 1365 ifp->if_flags &= ~IFF_RUNNING; 1366 gre_reconf(sc, sp); 1367 } 1368 1369 break; 1370 case GREGADDRS: 1371 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_src)); 1372 break; 1373 case GREGADDRD: 1374 ifreq_setaddr(cmd, ifr, sstosa(&sp->sp_dst)); 1375 break; 1376 case GREDSOCK: 1377 GRE_DPRINTF(sc, "\n"); 1378 if (sp->sp_bysock) 1379 ifp->if_flags &= ~IFF_UP; 1380 gre_clearconf(sp, false); 1381 goto mksocket; 1382 case GRESSOCK: 1383 GRE_DPRINTF(sc, "\n"); 1384 gre_clearconf(sp, true); 1385 fd = (int)ifr->ifr_value; 1386 sp->sp_bysock = true; 1387 ifp->if_flags |= IFF_UP; 1388 goto setsock; 1389 case SIOCSLIFPHYADDR: 1390 GRE_DPRINTF(sc, "\n"); 1391 if (lifr->addr.ss_family != lifr->dstaddr.ss_family) { 1392 error = EAFNOSUPPORT; 1393 break; 1394 } 1395 sockaddr_copy(sstosa(&sp->sp_src), sizeof(sp->sp_src), 1396 sstosa(&lifr->addr)); 1397 sockaddr_copy(sstosa(&sp->sp_dst), sizeof(sp->sp_dst), 1398 sstosa(&lifr->dstaddr)); 1399 GRE_DPRINTF(sc, "\n"); 1400 goto checkaddr; 1401 case SIOCDIFPHYADDR: 1402 GRE_DPRINTF(sc, "\n"); 1403 gre_clearconf(sp, true); 1404 ifp->if_flags &= ~IFF_UP; 1405 goto mksocket; 1406 case SIOCGLIFPHYADDR: 1407 GRE_DPRINTF(sc, "\n"); 1408 if (gre_is_nullconf(sp)) { 1409 error = EADDRNOTAVAIL; 1410 break; 1411 } 1412 sockaddr_copy(sstosa(&lifr->addr), sizeof(lifr->addr), 1413 sstosa(&sp->sp_src)); 1414 sockaddr_copy(sstosa(&lifr->dstaddr), sizeof(lifr->dstaddr), 1415 sstosa(&sp->sp_dst)); 1416 GRE_DPRINTF(sc, "\n"); 1417 break; 1418 default: 1419 error = ifioctl_common(ifp, cmd, data); 1420 break; 1421 } 1422 out: 1423 GRE_DPRINTF(sc, "\n"); 1424 splx(s); 1425 return error; 1426 } 1427 1428 void greattach(int); 1429 1430 /* ARGSUSED */ 1431 void 1432 greattach(int count) 1433 { 1434 if_clone_attach(&gre_cloner); 1435 } 1436
Indexes created Sat Oct 18 08:10:09 GMT 2025