if_l2tp.c revision 1.39
1 /* $NetBSD: if_l2tp.c,v 1.39 2019/09/19 06:09:52 knakahara Exp $ */ 2 3 /* 4 * Copyright (c) 2017 Internet Initiative Japan Inc. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 /* 30 * L2TPv3 kernel interface 31 */ 32 33 #include <sys/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: if_l2tp.c,v 1.39 2019/09/19 06:09:52 knakahara Exp $"); 35 36 #ifdef _KERNEL_OPT 37 #include "opt_inet.h" 38 #include "opt_net_mpsafe.h" 39 #endif 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/kernel.h> 44 #include <sys/mbuf.h> 45 #include <sys/socket.h> 46 #include <sys/sockio.h> 47 #include <sys/errno.h> 48 #include <sys/ioctl.h> 49 #include <sys/time.h> 50 #include <sys/syslog.h> 51 #include <sys/proc.h> 52 #include <sys/conf.h> 53 #include <sys/kauth.h> 54 #include <sys/cpu.h> 55 #include <sys/cprng.h> 56 #include <sys/intr.h> 57 #include <sys/kmem.h> 58 #include <sys/mutex.h> 59 #include <sys/atomic.h> 60 #include <sys/pserialize.h> 61 #include <sys/device.h> 62 #include <sys/module.h> 63 64 #include <net/if.h> 65 #include <net/if_dl.h> 66 #include <net/if_ether.h> 67 #include <net/if_types.h> 68 #include <net/netisr.h> 69 #include <net/route.h> 70 #include <net/bpf.h> 71 #include <net/if_vlanvar.h> 72 73 #include <netinet/in.h> 74 #include <netinet/in_systm.h> 75 #include <netinet/ip.h> 76 #include <netinet/ip_encap.h> 77 #ifdef INET 78 #include <netinet/in_var.h> 79 #include <netinet/in_l2tp.h> 80 #endif /* INET */ 81 #ifdef INET6 82 #include <netinet6/in6_l2tp.h> 83 #endif 84 85 #include <net/if_l2tp.h> 86 87 #include <net/if_vlanvar.h> 88 89 /* TODO: IP_TCPMSS support */ 90 #undef IP_TCPMSS 91 #ifdef IP_TCPMSS 92 #include <netinet/ip_tcpmss.h> 93 #endif 94 95 /* 96 * l2tp global variable definitions 97 */ 98 static struct { 99 LIST_HEAD(l2tp_sclist, l2tp_softc) list; 100 kmutex_t lock; 101 } l2tp_softcs __cacheline_aligned; 102 103 104 #if !defined(L2TP_ID_HASH_SIZE) 105 #define L2TP_ID_HASH_SIZE 64 106 #endif 107 static struct { 108 kmutex_t lock; 109 struct pslist_head *lists; 110 u_long mask; 111 } l2tp_hash __cacheline_aligned = { 112 .lists = NULL, 113 }; 114 115 pserialize_t l2tp_psz __read_mostly; 116 struct psref_class *lv_psref_class __read_mostly; 117 118 static void l2tp_ifq_init_pc(void *, void *, struct cpu_info *); 119 static void l2tp_ifq_fini_pc(void *, void *, struct cpu_info *); 120 121 static int l2tp_clone_create(struct if_clone *, int); 122 static int l2tp_clone_destroy(struct ifnet *); 123 124 struct if_clone l2tp_cloner = 125 IF_CLONE_INITIALIZER("l2tp", l2tp_clone_create, l2tp_clone_destroy); 126 127 static int l2tp_tx_enqueue(struct l2tp_variant *, struct mbuf *); 128 static int l2tp_output(struct ifnet *, struct mbuf *, 129 const struct sockaddr *, const struct rtentry *); 130 static void l2tp_sendit(struct l2tp_variant *, struct mbuf *); 131 static void l2tpintr(struct l2tp_variant *); 132 static void l2tpintr_softint(void *); 133 134 static void l2tp_hash_init(void); 135 static int l2tp_hash_fini(void); 136 137 static void l2tp_start(struct ifnet *); 138 static int l2tp_transmit(struct ifnet *, struct mbuf *); 139 140 static int l2tp_set_tunnel(struct ifnet *, struct sockaddr *, 141 struct sockaddr *); 142 static void l2tp_delete_tunnel(struct ifnet *); 143 144 static int id_hash_func(uint32_t, u_long); 145 146 static void l2tp_variant_update(struct l2tp_softc *, struct l2tp_variant *); 147 static int l2tp_set_session(struct l2tp_softc *, uint32_t, uint32_t); 148 static int l2tp_clear_session(struct l2tp_softc *); 149 static int l2tp_set_cookie(struct l2tp_softc *, uint64_t, u_int, uint64_t, u_int); 150 static void l2tp_clear_cookie(struct l2tp_softc *); 151 static void l2tp_set_state(struct l2tp_softc *, int); 152 static int l2tp_encap_attach(struct l2tp_variant *); 153 static int l2tp_encap_detach(struct l2tp_variant *); 154 155 static inline struct ifqueue * 156 l2tp_ifq_percpu_getref(percpu_t *pc) 157 { 158 159 return *(struct ifqueue **)percpu_getref(pc); 160 } 161 162 static inline void 163 l2tp_ifq_percpu_putref(percpu_t *pc) 164 { 165 166 percpu_putref(pc); 167 } 168 169 #ifndef MAX_L2TP_NEST 170 /* 171 * This macro controls the upper limitation on nesting of l2tp tunnels. 172 * Since, setting a large value to this macro with a careless configuration 173 * may introduce system crash, we don't allow any nestings by default. 174 * If you need to configure nested l2tp tunnels, you can define this macro 175 * in your kernel configuration file. However, if you do so, please be 176 * careful to configure the tunnels so that it won't make a loop. 177 */ 178 /* 179 * XXX 180 * Currently, if in_l2tp_output recursively calls, it causes locking against 181 * myself of struct l2tp_ro->lr_lock. So, nested l2tp tunnels is prohibited. 182 */ 183 #define MAX_L2TP_NEST 0 184 #endif 185 186 static int max_l2tp_nesting = MAX_L2TP_NEST; 187 188 /* ARGSUSED */ 189 void 190 l2tpattach(int count) 191 { 192 /* 193 * Nothing to do here, initialization is handled by the 194 * module initialization code in l2tpinit() below). 195 */ 196 } 197 198 static void 199 l2tpinit(void) 200 { 201 202 mutex_init(&l2tp_softcs.lock, MUTEX_DEFAULT, IPL_NONE); 203 LIST_INIT(&l2tp_softcs.list); 204 205 mutex_init(&l2tp_hash.lock, MUTEX_DEFAULT, IPL_NONE); 206 l2tp_psz = pserialize_create(); 207 lv_psref_class = psref_class_create("l2tpvar", IPL_SOFTNET); 208 if_clone_attach(&l2tp_cloner); 209 210 l2tp_hash_init(); 211 } 212 213 static int 214 l2tpdetach(void) 215 { 216 int error; 217 218 mutex_enter(&l2tp_softcs.lock); 219 if (!LIST_EMPTY(&l2tp_softcs.list)) { 220 mutex_exit(&l2tp_softcs.lock); 221 return EBUSY; 222 } 223 mutex_exit(&l2tp_softcs.lock); 224 225 error = l2tp_hash_fini(); 226 if (error) 227 return error; 228 229 if_clone_detach(&l2tp_cloner); 230 psref_class_destroy(lv_psref_class); 231 pserialize_destroy(l2tp_psz); 232 mutex_destroy(&l2tp_hash.lock); 233 234 mutex_destroy(&l2tp_softcs.lock); 235 236 return error; 237 } 238 239 static int 240 l2tp_clone_create(struct if_clone *ifc, int unit) 241 { 242 struct l2tp_softc *sc; 243 struct l2tp_variant *var; 244 int rv; 245 u_int si_flags = SOFTINT_NET; 246 #ifdef NET_MPSAFE 247 si_flags |= SOFTINT_MPSAFE; 248 #endif 249 sc = kmem_zalloc(sizeof(struct l2tp_softc), KM_SLEEP); 250 if_initname(&sc->l2tp_ec.ec_if, ifc->ifc_name, unit); 251 rv = l2tpattach0(sc); 252 if (rv != 0) { 253 kmem_free(sc, sizeof(struct l2tp_softc)); 254 return rv; 255 } 256 257 var = kmem_zalloc(sizeof(struct l2tp_variant), KM_SLEEP); 258 var->lv_softc = sc; 259 var->lv_state = L2TP_STATE_DOWN; 260 var->lv_use_cookie = L2TP_COOKIE_OFF; 261 psref_target_init(&var->lv_psref, lv_psref_class); 262 263 sc->l2tp_var = var; 264 mutex_init(&sc->l2tp_lock, MUTEX_DEFAULT, IPL_NONE); 265 sc->l2tp_psz = pserialize_create(); 266 PSLIST_ENTRY_INIT(sc, l2tp_hash); 267 268 sc->l2tp_ro_percpu = if_tunnel_alloc_ro_percpu(); 269 270 sc->l2tp_ifq_percpu = percpu_alloc(sizeof(struct ifqueue *)); 271 percpu_foreach(sc->l2tp_ifq_percpu, l2tp_ifq_init_pc, NULL); 272 sc->l2tp_si = softint_establish(si_flags, l2tpintr_softint, sc); 273 274 mutex_enter(&l2tp_softcs.lock); 275 LIST_INSERT_HEAD(&l2tp_softcs.list, sc, l2tp_list); 276 mutex_exit(&l2tp_softcs.lock); 277 278 return (0); 279 } 280 281 int 282 l2tpattach0(struct l2tp_softc *sc) 283 { 284 int rv; 285 286 sc->l2tp_ec.ec_if.if_addrlen = 0; 287 sc->l2tp_ec.ec_if.if_mtu = L2TP_MTU; 288 sc->l2tp_ec.ec_if.if_flags = IFF_POINTOPOINT|IFF_MULTICAST|IFF_SIMPLEX; 289 sc->l2tp_ec.ec_if.if_extflags = IFEF_NO_LINK_STATE_CHANGE; 290 #ifdef NET_MPSAFE 291 sc->l2tp_ec.ec_if.if_extflags |= IFEF_MPSAFE; 292 #endif 293 sc->l2tp_ec.ec_if.if_ioctl = l2tp_ioctl; 294 sc->l2tp_ec.ec_if.if_output = l2tp_output; 295 sc->l2tp_ec.ec_if.if_type = IFT_L2TP; 296 sc->l2tp_ec.ec_if.if_dlt = DLT_NULL; 297 sc->l2tp_ec.ec_if.if_start = l2tp_start; 298 sc->l2tp_ec.ec_if.if_transmit = l2tp_transmit; 299 sc->l2tp_ec.ec_if._if_input = ether_input; 300 IFQ_SET_READY(&sc->l2tp_ec.ec_if.if_snd); 301 302 #ifdef MBUFTRACE 303 struct ethercom *ec = &sc->l2tp_ec; 304 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 305 306 strlcpy(ec->ec_tx_mowner.mo_name, ifp->if_xname, 307 sizeof(ec->ec_tx_mowner.mo_name)); 308 strlcpy(ec->ec_tx_mowner.mo_descr, "tx", 309 sizeof(ec->ec_tx_mowner.mo_descr)); 310 strlcpy(ec->ec_rx_mowner.mo_name, ifp->if_xname, 311 sizeof(ec->ec_rx_mowner.mo_name)); 312 strlcpy(ec->ec_rx_mowner.mo_descr, "rx", 313 sizeof(ec->ec_rx_mowner.mo_descr)); 314 MOWNER_ATTACH(&ec->ec_tx_mowner); 315 MOWNER_ATTACH(&ec->ec_rx_mowner); 316 ifp->if_mowner = &ec->ec_tx_mowner; 317 #endif 318 319 /* XXX 320 * It may improve performance to use if_initialize()/if_register() 321 * so that l2tp_input() calls if_input() instead of 322 * if_percpuq_enqueue(). However, that causes recursive softnet_lock 323 * when NET_MPSAFE is not set. 324 */ 325 rv = if_attach(&sc->l2tp_ec.ec_if); 326 if (rv != 0) 327 return rv; 328 if_alloc_sadl(&sc->l2tp_ec.ec_if); 329 bpf_attach(&sc->l2tp_ec.ec_if, DLT_EN10MB, sizeof(struct ether_header)); 330 331 return 0; 332 } 333 334 void 335 l2tp_ifq_init_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 336 { 337 struct ifqueue **ifqp = p; 338 339 *ifqp = kmem_zalloc(sizeof(**ifqp), KM_SLEEP); 340 (*ifqp)->ifq_maxlen = IFQ_MAXLEN; 341 } 342 343 void 344 l2tp_ifq_fini_pc(void *p, void *arg __unused, struct cpu_info *ci __unused) 345 { 346 struct ifqueue **ifqp = p; 347 348 kmem_free(*ifqp, sizeof(**ifqp)); 349 } 350 351 static int 352 l2tp_clone_destroy(struct ifnet *ifp) 353 { 354 struct l2tp_variant *var; 355 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 356 l2tp_ec.ec_if); 357 358 l2tp_clear_session(sc); 359 l2tp_delete_tunnel(&sc->l2tp_ec.ec_if); 360 /* 361 * To avoid for l2tp_transmit() and l2tpintr_softint() to access 362 * sc->l2tp_var after free it. 363 */ 364 mutex_enter(&sc->l2tp_lock); 365 var = sc->l2tp_var; 366 l2tp_variant_update(sc, NULL); 367 mutex_exit(&sc->l2tp_lock); 368 369 softint_disestablish(sc->l2tp_si); 370 percpu_foreach(sc->l2tp_ifq_percpu, l2tp_ifq_fini_pc, NULL); 371 percpu_free(sc->l2tp_ifq_percpu, sizeof(struct ifqueue *)); 372 373 mutex_enter(&l2tp_softcs.lock); 374 LIST_REMOVE(sc, l2tp_list); 375 mutex_exit(&l2tp_softcs.lock); 376 377 bpf_detach(ifp); 378 379 if_detach(ifp); 380 381 if_tunnel_free_ro_percpu(sc->l2tp_ro_percpu); 382 383 kmem_free(var, sizeof(struct l2tp_variant)); 384 pserialize_destroy(sc->l2tp_psz); 385 mutex_destroy(&sc->l2tp_lock); 386 kmem_free(sc, sizeof(struct l2tp_softc)); 387 388 return 0; 389 } 390 391 static int 392 l2tp_tx_enqueue(struct l2tp_variant *var, struct mbuf *m) 393 { 394 struct l2tp_softc *sc; 395 struct ifnet *ifp; 396 struct ifqueue *ifq; 397 int s; 398 399 KASSERT(psref_held(&var->lv_psref, lv_psref_class)); 400 401 sc = var->lv_softc; 402 ifp = &sc->l2tp_ec.ec_if; 403 404 s = splsoftnet(); 405 ifq = l2tp_ifq_percpu_getref(sc->l2tp_ifq_percpu); 406 if (IF_QFULL(ifq)) { 407 ifp->if_oerrors++; 408 l2tp_ifq_percpu_putref(sc->l2tp_ifq_percpu); 409 splx(s); 410 m_freem(m); 411 return ENOBUFS; 412 } 413 414 IF_ENQUEUE(ifq, m); 415 percpu_putref(sc->l2tp_ifq_percpu); 416 softint_schedule(sc->l2tp_si); 417 /* counter is incremented in l2tpintr() */ 418 splx(s); 419 return 0; 420 } 421 422 static int 423 l2tp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 424 const struct rtentry *rt) 425 { 426 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 427 l2tp_ec.ec_if); 428 struct l2tp_variant *var; 429 struct psref psref; 430 int error = 0; 431 432 var = l2tp_getref_variant(sc, &psref); 433 if (var == NULL) { 434 m_freem(m); 435 return ENETDOWN; 436 } 437 438 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 439 440 m->m_flags &= ~(M_BCAST|M_MCAST); 441 442 if ((ifp->if_flags & IFF_UP) == 0) { 443 m_freem(m); 444 error = ENETDOWN; 445 goto end; 446 } 447 448 if (var->lv_psrc == NULL || var->lv_pdst == NULL) { 449 m_freem(m); 450 error = ENETDOWN; 451 goto end; 452 } 453 454 /* XXX should we check if our outer source is legal? */ 455 456 /* use DLT_NULL encapsulation here to pass inner af type */ 457 M_PREPEND(m, sizeof(int), M_DONTWAIT); 458 if (!m) { 459 error = ENOBUFS; 460 goto end; 461 } 462 *mtod(m, int *) = dst->sa_family; 463 464 error = l2tp_tx_enqueue(var, m); 465 end: 466 l2tp_putref_variant(var, &psref); 467 if (error) 468 ifp->if_oerrors++; 469 470 return error; 471 } 472 473 static void 474 l2tp_sendit(struct l2tp_variant *var, struct mbuf *m) 475 { 476 int len; 477 int error; 478 struct l2tp_softc *sc; 479 struct ifnet *ifp; 480 481 KASSERT(psref_held(&var->lv_psref, lv_psref_class)); 482 483 sc = var->lv_softc; 484 ifp = &sc->l2tp_ec.ec_if; 485 486 len = m->m_pkthdr.len; 487 m->m_flags &= ~(M_BCAST|M_MCAST); 488 bpf_mtap(ifp, m, BPF_D_OUT); 489 490 switch (var->lv_psrc->sa_family) { 491 #ifdef INET 492 case AF_INET: 493 error = in_l2tp_output(var, m); 494 break; 495 #endif 496 #ifdef INET6 497 case AF_INET6: 498 error = in6_l2tp_output(var, m); 499 break; 500 #endif 501 default: 502 m_freem(m); 503 error = ENETDOWN; 504 break; 505 } 506 if (error) { 507 ifp->if_oerrors++; 508 } else { 509 ifp->if_opackets++; 510 ifp->if_obytes += len; 511 } 512 } 513 514 static void 515 l2tpintr(struct l2tp_variant *var) 516 { 517 struct l2tp_softc *sc; 518 struct ifnet *ifp; 519 struct mbuf *m; 520 struct ifqueue *ifq; 521 u_int cpuid = cpu_index(curcpu()); 522 523 KASSERT(psref_held(&var->lv_psref, lv_psref_class)); 524 525 sc = var->lv_softc; 526 ifp = &sc->l2tp_ec.ec_if; 527 528 /* output processing */ 529 if (var->lv_my_sess_id == 0 || var->lv_peer_sess_id == 0) { 530 ifq = l2tp_ifq_percpu_getref(sc->l2tp_ifq_percpu); 531 IF_PURGE(ifq); 532 l2tp_ifq_percpu_putref(sc->l2tp_ifq_percpu); 533 if (cpuid == 0) 534 IFQ_PURGE(&ifp->if_snd); 535 return; 536 } 537 538 /* Currently, l2tpintr() is always called in softint context. */ 539 ifq = l2tp_ifq_percpu_getref(sc->l2tp_ifq_percpu); 540 for (;;) { 541 IF_DEQUEUE(ifq, m); 542 if (m != NULL) 543 l2tp_sendit(var, m); 544 else 545 break; 546 } 547 l2tp_ifq_percpu_putref(sc->l2tp_ifq_percpu); 548 549 if (cpuid == 0) { 550 for (;;) { 551 IFQ_DEQUEUE(&ifp->if_snd, m); 552 if (m != NULL) 553 l2tp_sendit(var, m); 554 else 555 break; 556 } 557 } 558 } 559 560 static void 561 l2tpintr_softint(void *arg) 562 { 563 struct l2tp_variant *var; 564 struct psref psref; 565 struct l2tp_softc *sc = arg; 566 567 var = l2tp_getref_variant(sc, &psref); 568 if (var == NULL) 569 return; 570 571 l2tpintr(var); 572 l2tp_putref_variant(var, &psref); 573 } 574 575 void 576 l2tp_input(struct mbuf *m, struct ifnet *ifp) 577 { 578 vaddr_t addr; 579 580 KASSERT(ifp != NULL); 581 582 /* 583 * Currently, l2tp(4) supports only ethernet as inner protocol. 584 */ 585 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 586 m_freem(m); 587 return; 588 } 589 590 /* 591 * If the head of the payload is not aligned, align it. 592 */ 593 addr = mtod(m, vaddr_t); 594 if ((addr & 0x03) != 0x2) { 595 /* copy and align head of payload */ 596 struct mbuf *m_head; 597 int copy_length; 598 u_int pad = roundup(sizeof(struct ether_header), 4) 599 - sizeof(struct ether_header); 600 601 #define L2TP_COPY_LENGTH 60 602 603 if (m->m_pkthdr.len < L2TP_COPY_LENGTH) { 604 copy_length = m->m_pkthdr.len; 605 } else { 606 copy_length = L2TP_COPY_LENGTH; 607 } 608 609 if (m->m_len < copy_length) { 610 m = m_pullup(m, copy_length); 611 if (m == NULL) 612 return; 613 } 614 615 MGETHDR(m_head, M_DONTWAIT, MT_HEADER); 616 if (m_head == NULL) { 617 m_freem(m); 618 return; 619 } 620 m_move_pkthdr(m_head, m); 621 622 /* 623 * m_head should be: 624 * L2TP_COPY_LENGTH 625 * <- + roundup(pad, 4) - pad -> 626 * +-------+--------+-----+--------------+-------------+ 627 * | m_hdr | pkthdr | ... | ether header | payload | 628 * +-------+--------+-----+--------------+-------------+ 629 * ^ ^ 630 * m_data 4 byte aligned 631 */ 632 m_align(m_head, L2TP_COPY_LENGTH + roundup(pad, 4)); 633 m_head->m_data += pad; 634 635 memcpy(mtod(m_head, void *), mtod(m, void *), copy_length); 636 m_head->m_len = copy_length; 637 m->m_data += copy_length; 638 m->m_len -= copy_length; 639 640 /* construct chain */ 641 if (m->m_len == 0) { 642 m_head->m_next = m_free(m); 643 } else { 644 m_head->m_next = m; 645 } 646 647 /* override m */ 648 m = m_head; 649 } 650 651 m_set_rcvif(m, ifp); 652 653 /* 654 * bpf_mtap() and ifp->if_ipackets++ is done in if_input() 655 * 656 * obytes is incremented at ether_output() or bridge_enqueue(). 657 */ 658 if_percpuq_enqueue(ifp->if_percpuq, m); 659 } 660 661 void 662 l2tp_start(struct ifnet *ifp) 663 { 664 struct psref psref; 665 struct l2tp_variant *var; 666 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 667 l2tp_ec.ec_if); 668 669 var = l2tp_getref_variant(sc, &psref); 670 if (var == NULL) 671 return; 672 673 if (var->lv_psrc == NULL || var->lv_pdst == NULL) 674 return; 675 676 softint_schedule(sc->l2tp_si); 677 l2tp_putref_variant(var, &psref); 678 } 679 680 int 681 l2tp_transmit(struct ifnet *ifp, struct mbuf *m) 682 { 683 int error; 684 struct psref psref; 685 struct l2tp_variant *var; 686 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 687 l2tp_ec.ec_if); 688 689 var = l2tp_getref_variant(sc, &psref); 690 if (var == NULL) { 691 m_freem(m); 692 return ENETDOWN; 693 } 694 695 if (var->lv_psrc == NULL || var->lv_pdst == NULL) { 696 m_freem(m); 697 error = ENETDOWN; 698 goto out; 699 } 700 701 m->m_flags &= ~(M_BCAST|M_MCAST); 702 703 error = l2tp_tx_enqueue(var, m); 704 out: 705 l2tp_putref_variant(var, &psref); 706 return error; 707 } 708 709 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ 710 int 711 l2tp_ioctl(struct ifnet *ifp, u_long cmd, void *data) 712 { 713 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 714 l2tp_ec.ec_if); 715 struct l2tp_variant *var, *var_tmp; 716 struct ifreq *ifr = data; 717 int error = 0, size; 718 struct sockaddr *dst, *src; 719 struct l2tp_req l2tpr; 720 u_long mtu; 721 int bound; 722 struct psref psref; 723 724 switch (cmd) { 725 case SIOCSIFADDR: 726 ifp->if_flags |= IFF_UP; 727 break; 728 729 case SIOCSIFDSTADDR: 730 break; 731 732 case SIOCADDMULTI: 733 case SIOCDELMULTI: 734 switch (ifr->ifr_addr.sa_family) { 735 #ifdef INET 736 case AF_INET: /* IP supports Multicast */ 737 break; 738 #endif /* INET */ 739 #ifdef INET6 740 case AF_INET6: /* IP6 supports Multicast */ 741 break; 742 #endif /* INET6 */ 743 default: /* Other protocols doesn't support Multicast */ 744 error = EAFNOSUPPORT; 745 break; 746 } 747 break; 748 749 case SIOCSIFMTU: 750 mtu = ifr->ifr_mtu; 751 if (mtu < L2TP_MTU_MIN || mtu > L2TP_MTU_MAX) 752 return (EINVAL); 753 ifp->if_mtu = mtu; 754 break; 755 756 #ifdef INET 757 case SIOCSIFPHYADDR: 758 src = (struct sockaddr *) 759 &(((struct in_aliasreq *)data)->ifra_addr); 760 dst = (struct sockaddr *) 761 &(((struct in_aliasreq *)data)->ifra_dstaddr); 762 if (src->sa_family != AF_INET || dst->sa_family != AF_INET) 763 return EAFNOSUPPORT; 764 else if (src->sa_len != sizeof(struct sockaddr_in) 765 || dst->sa_len != sizeof(struct sockaddr_in)) 766 return EINVAL; 767 768 error = l2tp_set_tunnel(&sc->l2tp_ec.ec_if, src, dst); 769 break; 770 771 #endif /* INET */ 772 #ifdef INET6 773 case SIOCSIFPHYADDR_IN6: 774 src = (struct sockaddr *) 775 &(((struct in6_aliasreq *)data)->ifra_addr); 776 dst = (struct sockaddr *) 777 &(((struct in6_aliasreq *)data)->ifra_dstaddr); 778 if (src->sa_family != AF_INET6 || dst->sa_family != AF_INET6) 779 return EAFNOSUPPORT; 780 else if (src->sa_len != sizeof(struct sockaddr_in6) 781 || dst->sa_len != sizeof(struct sockaddr_in6)) 782 return EINVAL; 783 784 error = l2tp_set_tunnel(&sc->l2tp_ec.ec_if, src, dst); 785 break; 786 787 #endif /* INET6 */ 788 case SIOCSLIFPHYADDR: 789 src = (struct sockaddr *) 790 &(((struct if_laddrreq *)data)->addr); 791 dst = (struct sockaddr *) 792 &(((struct if_laddrreq *)data)->dstaddr); 793 if (src->sa_family != dst->sa_family) 794 return EINVAL; 795 else if (src->sa_family == AF_INET 796 && src->sa_len != sizeof(struct sockaddr_in)) 797 return EINVAL; 798 else if (src->sa_family == AF_INET6 799 && src->sa_len != sizeof(struct sockaddr_in6)) 800 return EINVAL; 801 else if (dst->sa_family == AF_INET 802 && dst->sa_len != sizeof(struct sockaddr_in)) 803 return EINVAL; 804 else if (dst->sa_family == AF_INET6 805 && dst->sa_len != sizeof(struct sockaddr_in6)) 806 return EINVAL; 807 808 error = l2tp_set_tunnel(&sc->l2tp_ec.ec_if, src, dst); 809 break; 810 811 case SIOCDIFPHYADDR: 812 l2tp_delete_tunnel(&sc->l2tp_ec.ec_if); 813 break; 814 815 case SIOCGIFPSRCADDR: 816 #ifdef INET6 817 case SIOCGIFPSRCADDR_IN6: 818 #endif /* INET6 */ 819 bound = curlwp_bind(); 820 var = l2tp_getref_variant(sc, &psref); 821 if (var == NULL) { 822 curlwp_bindx(bound); 823 error = EADDRNOTAVAIL; 824 goto bad; 825 } 826 if (var->lv_psrc == NULL) { 827 l2tp_putref_variant(var, &psref); 828 curlwp_bindx(bound); 829 error = EADDRNOTAVAIL; 830 goto bad; 831 } 832 src = var->lv_psrc; 833 switch (cmd) { 834 #ifdef INET 835 case SIOCGIFPSRCADDR: 836 dst = &ifr->ifr_addr; 837 size = sizeof(ifr->ifr_addr); 838 break; 839 #endif /* INET */ 840 #ifdef INET6 841 case SIOCGIFPSRCADDR_IN6: 842 dst = (struct sockaddr *) 843 &(((struct in6_ifreq *)data)->ifr_addr); 844 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 845 break; 846 #endif /* INET6 */ 847 default: 848 l2tp_putref_variant(var, &psref); 849 curlwp_bindx(bound); 850 error = EADDRNOTAVAIL; 851 goto bad; 852 } 853 if (src->sa_len > size) { 854 l2tp_putref_variant(var, &psref); 855 curlwp_bindx(bound); 856 return EINVAL; 857 } 858 sockaddr_copy(dst, src->sa_len, src); 859 l2tp_putref_variant(var, &psref); 860 curlwp_bindx(bound); 861 break; 862 863 case SIOCGIFPDSTADDR: 864 #ifdef INET6 865 case SIOCGIFPDSTADDR_IN6: 866 #endif /* INET6 */ 867 bound = curlwp_bind(); 868 var = l2tp_getref_variant(sc, &psref); 869 if (var == NULL) { 870 curlwp_bindx(bound); 871 error = EADDRNOTAVAIL; 872 goto bad; 873 } 874 if (var->lv_pdst == NULL) { 875 l2tp_putref_variant(var, &psref); 876 curlwp_bindx(bound); 877 error = EADDRNOTAVAIL; 878 goto bad; 879 } 880 src = var->lv_pdst; 881 switch (cmd) { 882 #ifdef INET 883 case SIOCGIFPDSTADDR: 884 dst = &ifr->ifr_addr; 885 size = sizeof(ifr->ifr_addr); 886 break; 887 #endif /* INET */ 888 #ifdef INET6 889 case SIOCGIFPDSTADDR_IN6: 890 dst = (struct sockaddr *) 891 &(((struct in6_ifreq *)data)->ifr_addr); 892 size = sizeof(((struct in6_ifreq *)data)->ifr_addr); 893 break; 894 #endif /* INET6 */ 895 default: 896 l2tp_putref_variant(var, &psref); 897 curlwp_bindx(bound); 898 error = EADDRNOTAVAIL; 899 goto bad; 900 } 901 if (src->sa_len > size) { 902 l2tp_putref_variant(var, &psref); 903 curlwp_bindx(bound); 904 return EINVAL; 905 } 906 sockaddr_copy(dst, src->sa_len, src); 907 l2tp_putref_variant(var, &psref); 908 curlwp_bindx(bound); 909 break; 910 911 case SIOCGLIFPHYADDR: 912 bound = curlwp_bind(); 913 var = l2tp_getref_variant(sc, &psref); 914 if (var == NULL) { 915 curlwp_bindx(bound); 916 error = EADDRNOTAVAIL; 917 goto bad; 918 } 919 if (var->lv_psrc == NULL || var->lv_pdst == NULL) { 920 l2tp_putref_variant(var, &psref); 921 curlwp_bindx(bound); 922 error = EADDRNOTAVAIL; 923 goto bad; 924 } 925 926 /* copy src */ 927 src = var->lv_psrc; 928 dst = (struct sockaddr *) 929 &(((struct if_laddrreq *)data)->addr); 930 size = sizeof(((struct if_laddrreq *)data)->addr); 931 if (src->sa_len > size) { 932 l2tp_putref_variant(var, &psref); 933 curlwp_bindx(bound); 934 return EINVAL; 935 } 936 sockaddr_copy(dst, src->sa_len, src); 937 938 /* copy dst */ 939 src = var->lv_pdst; 940 dst = (struct sockaddr *) 941 &(((struct if_laddrreq *)data)->dstaddr); 942 size = sizeof(((struct if_laddrreq *)data)->dstaddr); 943 if (src->sa_len > size) { 944 l2tp_putref_variant(var, &psref); 945 curlwp_bindx(bound); 946 return EINVAL; 947 } 948 sockaddr_copy(dst, src->sa_len, src); 949 l2tp_putref_variant(var, &psref); 950 curlwp_bindx(bound); 951 break; 952 953 case SIOCSL2TPSESSION: 954 if ((error = copyin(ifr->ifr_data, &l2tpr, sizeof(l2tpr))) != 0) 955 break; 956 957 /* session id must not zero */ 958 if (l2tpr.my_sess_id == 0 || l2tpr.peer_sess_id == 0) 959 return EINVAL; 960 961 bound = curlwp_bind(); 962 var_tmp = l2tp_lookup_session_ref(l2tpr.my_sess_id, &psref); 963 if (var_tmp != NULL) { 964 /* duplicate session id */ 965 log(LOG_WARNING, "%s: duplicate session id %" PRIu32 " of %s\n", 966 sc->l2tp_ec.ec_if.if_xname, l2tpr.my_sess_id, 967 var_tmp->lv_softc->l2tp_ec.ec_if.if_xname); 968 psref_release(&psref, &var_tmp->lv_psref, 969 lv_psref_class); 970 curlwp_bindx(bound); 971 return EINVAL; 972 } 973 curlwp_bindx(bound); 974 975 error = l2tp_set_session(sc, l2tpr.my_sess_id, l2tpr.peer_sess_id); 976 break; 977 case SIOCDL2TPSESSION: 978 l2tp_clear_session(sc); 979 break; 980 case SIOCSL2TPCOOKIE: 981 if ((error = copyin(ifr->ifr_data, &l2tpr, sizeof(l2tpr))) != 0) 982 break; 983 984 error = l2tp_set_cookie(sc, l2tpr.my_cookie, l2tpr.my_cookie_len, 985 l2tpr.peer_cookie, l2tpr.peer_cookie_len); 986 break; 987 case SIOCDL2TPCOOKIE: 988 l2tp_clear_cookie(sc); 989 break; 990 case SIOCSL2TPSTATE: 991 if ((error = copyin(ifr->ifr_data, &l2tpr, sizeof(l2tpr))) != 0) 992 break; 993 994 l2tp_set_state(sc, l2tpr.state); 995 break; 996 case SIOCGL2TP: 997 /* get L2TPV3 session info */ 998 memset(&l2tpr, 0, sizeof(l2tpr)); 999 1000 bound = curlwp_bind(); 1001 var = l2tp_getref_variant(sc, &psref); 1002 if (var == NULL) { 1003 curlwp_bindx(bound); 1004 error = EADDRNOTAVAIL; 1005 goto bad; 1006 } 1007 1008 l2tpr.state = var->lv_state; 1009 l2tpr.my_sess_id = var->lv_my_sess_id; 1010 l2tpr.peer_sess_id = var->lv_peer_sess_id; 1011 l2tpr.my_cookie = var->lv_my_cookie; 1012 l2tpr.my_cookie_len = var->lv_my_cookie_len; 1013 l2tpr.peer_cookie = var->lv_peer_cookie; 1014 l2tpr.peer_cookie_len = var->lv_peer_cookie_len; 1015 l2tp_putref_variant(var, &psref); 1016 curlwp_bindx(bound); 1017 1018 error = copyout(&l2tpr, ifr->ifr_data, sizeof(l2tpr)); 1019 break; 1020 1021 default: 1022 error = ifioctl_common(ifp, cmd, data); 1023 break; 1024 } 1025 bad: 1026 return error; 1027 } 1028 1029 static int 1030 l2tp_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) 1031 { 1032 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 1033 l2tp_ec.ec_if); 1034 struct sockaddr *osrc, *odst; 1035 struct sockaddr *nsrc, *ndst; 1036 struct l2tp_variant *ovar, *nvar; 1037 int error; 1038 1039 nsrc = sockaddr_dup(src, M_WAITOK); 1040 ndst = sockaddr_dup(dst, M_WAITOK); 1041 1042 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1043 1044 error = encap_lock_enter(); 1045 if (error) 1046 goto error; 1047 1048 mutex_enter(&sc->l2tp_lock); 1049 1050 ovar = sc->l2tp_var; 1051 osrc = ovar->lv_psrc; 1052 odst = ovar->lv_pdst; 1053 *nvar = *ovar; 1054 psref_target_init(&nvar->lv_psref, lv_psref_class); 1055 nvar->lv_psrc = nsrc; 1056 nvar->lv_pdst = ndst; 1057 error = l2tp_encap_attach(nvar); 1058 if (error) { 1059 mutex_exit(&sc->l2tp_lock); 1060 encap_lock_exit(); 1061 goto error; 1062 } 1063 membar_producer(); 1064 l2tp_variant_update(sc, nvar); 1065 1066 mutex_exit(&sc->l2tp_lock); 1067 1068 (void)l2tp_encap_detach(ovar); 1069 encap_lock_exit(); 1070 1071 if (osrc) 1072 sockaddr_free(osrc); 1073 if (odst) 1074 sockaddr_free(odst); 1075 kmem_free(ovar, sizeof(*ovar)); 1076 1077 return 0; 1078 1079 error: 1080 sockaddr_free(nsrc); 1081 sockaddr_free(ndst); 1082 kmem_free(nvar, sizeof(*nvar)); 1083 1084 return error; 1085 } 1086 1087 static void 1088 l2tp_delete_tunnel(struct ifnet *ifp) 1089 { 1090 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 1091 l2tp_ec.ec_if); 1092 struct sockaddr *osrc, *odst; 1093 struct l2tp_variant *ovar, *nvar; 1094 int error; 1095 1096 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1097 1098 error = encap_lock_enter(); 1099 if (error) { 1100 kmem_free(nvar, sizeof(*nvar)); 1101 return; 1102 } 1103 mutex_enter(&sc->l2tp_lock); 1104 1105 ovar = sc->l2tp_var; 1106 osrc = ovar->lv_psrc; 1107 odst = ovar->lv_pdst; 1108 *nvar = *ovar; 1109 psref_target_init(&nvar->lv_psref, lv_psref_class); 1110 nvar->lv_psrc = NULL; 1111 nvar->lv_pdst = NULL; 1112 membar_producer(); 1113 l2tp_variant_update(sc, nvar); 1114 1115 mutex_exit(&sc->l2tp_lock); 1116 1117 (void)l2tp_encap_detach(ovar); 1118 encap_lock_exit(); 1119 1120 if (osrc) 1121 sockaddr_free(osrc); 1122 if (odst) 1123 sockaddr_free(odst); 1124 kmem_free(ovar, sizeof(*ovar)); 1125 } 1126 1127 static int 1128 id_hash_func(uint32_t id, u_long mask) 1129 { 1130 uint32_t hash; 1131 1132 hash = (id >> 16) ^ id; 1133 hash = (hash >> 4) ^ hash; 1134 1135 return hash & mask; 1136 } 1137 1138 static void 1139 l2tp_hash_init(void) 1140 { 1141 1142 l2tp_hash.lists = hashinit(L2TP_ID_HASH_SIZE, HASH_PSLIST, true, 1143 &l2tp_hash.mask); 1144 } 1145 1146 static int 1147 l2tp_hash_fini(void) 1148 { 1149 int i; 1150 1151 mutex_enter(&l2tp_hash.lock); 1152 1153 for (i = 0; i < l2tp_hash.mask + 1; i++) { 1154 if (PSLIST_WRITER_FIRST(&l2tp_hash.lists[i], struct l2tp_softc, 1155 l2tp_hash) != NULL) { 1156 mutex_exit(&l2tp_hash.lock); 1157 return EBUSY; 1158 } 1159 } 1160 for (i = 0; i < l2tp_hash.mask + 1; i++) 1161 PSLIST_DESTROY(&l2tp_hash.lists[i]); 1162 1163 mutex_exit(&l2tp_hash.lock); 1164 1165 hashdone(l2tp_hash.lists, HASH_PSLIST, l2tp_hash.mask); 1166 1167 return 0; 1168 } 1169 1170 static int 1171 l2tp_set_session(struct l2tp_softc *sc, uint32_t my_sess_id, 1172 uint32_t peer_sess_id) 1173 { 1174 uint32_t idx; 1175 struct l2tp_variant *nvar; 1176 struct l2tp_variant *ovar; 1177 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 1178 1179 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1180 1181 mutex_enter(&sc->l2tp_lock); 1182 ovar = sc->l2tp_var; 1183 *nvar = *ovar; 1184 psref_target_init(&nvar->lv_psref, lv_psref_class); 1185 nvar->lv_my_sess_id = my_sess_id; 1186 nvar->lv_peer_sess_id = peer_sess_id; 1187 membar_producer(); 1188 1189 mutex_enter(&l2tp_hash.lock); 1190 if (ovar->lv_my_sess_id > 0 && ovar->lv_peer_sess_id > 0) { 1191 PSLIST_WRITER_REMOVE(sc, l2tp_hash); 1192 pserialize_perform(l2tp_psz); 1193 } 1194 mutex_exit(&l2tp_hash.lock); 1195 PSLIST_ENTRY_DESTROY(sc, l2tp_hash); 1196 1197 l2tp_variant_update(sc, nvar); 1198 mutex_exit(&sc->l2tp_lock); 1199 1200 idx = id_hash_func(nvar->lv_my_sess_id, l2tp_hash.mask); 1201 if ((ifp->if_flags & IFF_DEBUG) != 0) 1202 log(LOG_DEBUG, "%s: add hash entry: sess_id=%" PRIu32 ", idx=%" PRIu32 "\n", 1203 sc->l2tp_ec.ec_if.if_xname, nvar->lv_my_sess_id, idx); 1204 1205 PSLIST_ENTRY_INIT(sc, l2tp_hash); 1206 mutex_enter(&l2tp_hash.lock); 1207 PSLIST_WRITER_INSERT_HEAD(&l2tp_hash.lists[idx], sc, l2tp_hash); 1208 mutex_exit(&l2tp_hash.lock); 1209 1210 kmem_free(ovar, sizeof(*ovar)); 1211 return 0; 1212 } 1213 1214 static int 1215 l2tp_clear_session(struct l2tp_softc *sc) 1216 { 1217 struct l2tp_variant *nvar; 1218 struct l2tp_variant *ovar; 1219 1220 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1221 1222 mutex_enter(&sc->l2tp_lock); 1223 ovar = sc->l2tp_var; 1224 *nvar = *ovar; 1225 psref_target_init(&nvar->lv_psref, lv_psref_class); 1226 nvar->lv_my_sess_id = 0; 1227 nvar->lv_peer_sess_id = 0; 1228 membar_producer(); 1229 1230 mutex_enter(&l2tp_hash.lock); 1231 if (ovar->lv_my_sess_id > 0 && ovar->lv_peer_sess_id > 0) { 1232 PSLIST_WRITER_REMOVE(sc, l2tp_hash); 1233 pserialize_perform(l2tp_psz); 1234 } 1235 mutex_exit(&l2tp_hash.lock); 1236 1237 l2tp_variant_update(sc, nvar); 1238 mutex_exit(&sc->l2tp_lock); 1239 kmem_free(ovar, sizeof(*ovar)); 1240 return 0; 1241 } 1242 1243 struct l2tp_variant * 1244 l2tp_lookup_session_ref(uint32_t id, struct psref *psref) 1245 { 1246 int idx; 1247 int s; 1248 struct l2tp_softc *sc; 1249 1250 idx = id_hash_func(id, l2tp_hash.mask); 1251 1252 s = pserialize_read_enter(); 1253 PSLIST_READER_FOREACH(sc, &l2tp_hash.lists[idx], struct l2tp_softc, 1254 l2tp_hash) { 1255 struct l2tp_variant *var = sc->l2tp_var; 1256 if (var == NULL) 1257 continue; 1258 if (var->lv_my_sess_id != id) 1259 continue; 1260 psref_acquire(psref, &var->lv_psref, lv_psref_class); 1261 pserialize_read_exit(s); 1262 return var; 1263 } 1264 pserialize_read_exit(s); 1265 return NULL; 1266 } 1267 1268 /* 1269 * l2tp_variant update API. 1270 * 1271 * Assumption: 1272 * reader side dereferences sc->l2tp_var in reader critical section only, 1273 * that is, all of reader sides do not reader the sc->l2tp_var after 1274 * pserialize_perform(). 1275 */ 1276 static void 1277 l2tp_variant_update(struct l2tp_softc *sc, struct l2tp_variant *nvar) 1278 { 1279 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 1280 struct l2tp_variant *ovar = sc->l2tp_var; 1281 1282 KASSERT(mutex_owned(&sc->l2tp_lock)); 1283 1284 sc->l2tp_var = nvar; 1285 pserialize_perform(sc->l2tp_psz); 1286 psref_target_destroy(&ovar->lv_psref, lv_psref_class); 1287 1288 /* 1289 * In the manual of atomic_swap_ptr(3), there is no mention if 2nd 1290 * argument is rewrite or not. So, use sc->l2tp_var instead of nvar. 1291 */ 1292 if (sc->l2tp_var != NULL) { 1293 if (sc->l2tp_var->lv_psrc != NULL 1294 && sc->l2tp_var->lv_pdst != NULL) 1295 ifp->if_flags |= IFF_RUNNING; 1296 else 1297 ifp->if_flags &= ~IFF_RUNNING; 1298 } 1299 } 1300 1301 static int 1302 l2tp_set_cookie(struct l2tp_softc *sc, uint64_t my_cookie, u_int my_cookie_len, 1303 uint64_t peer_cookie, u_int peer_cookie_len) 1304 { 1305 struct l2tp_variant *nvar; 1306 1307 if (my_cookie == 0 || peer_cookie == 0) 1308 return EINVAL; 1309 1310 if (my_cookie_len != 4 && my_cookie_len != 8 1311 && peer_cookie_len != 4 && peer_cookie_len != 8) 1312 return EINVAL; 1313 1314 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1315 1316 mutex_enter(&sc->l2tp_lock); 1317 1318 *nvar = *sc->l2tp_var; 1319 psref_target_init(&nvar->lv_psref, lv_psref_class); 1320 nvar->lv_my_cookie = my_cookie; 1321 nvar->lv_my_cookie_len = my_cookie_len; 1322 nvar->lv_peer_cookie = peer_cookie; 1323 nvar->lv_peer_cookie_len = peer_cookie_len; 1324 nvar->lv_use_cookie = L2TP_COOKIE_ON; 1325 membar_producer(); 1326 l2tp_variant_update(sc, nvar); 1327 1328 mutex_exit(&sc->l2tp_lock); 1329 1330 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 1331 if ((ifp->if_flags & IFF_DEBUG) != 0) { 1332 log(LOG_DEBUG, 1333 "%s: set cookie: " 1334 "local cookie_len=%u local cookie=%" PRIu64 ", " 1335 "remote cookie_len=%u remote cookie=%" PRIu64 "\n", 1336 ifp->if_xname, my_cookie_len, my_cookie, 1337 peer_cookie_len, peer_cookie); 1338 } 1339 1340 return 0; 1341 } 1342 1343 static void 1344 l2tp_clear_cookie(struct l2tp_softc *sc) 1345 { 1346 struct l2tp_variant *nvar; 1347 1348 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1349 1350 mutex_enter(&sc->l2tp_lock); 1351 1352 *nvar = *sc->l2tp_var; 1353 psref_target_init(&nvar->lv_psref, lv_psref_class); 1354 nvar->lv_my_cookie = 0; 1355 nvar->lv_my_cookie_len = 0; 1356 nvar->lv_peer_cookie = 0; 1357 nvar->lv_peer_cookie_len = 0; 1358 nvar->lv_use_cookie = L2TP_COOKIE_OFF; 1359 membar_producer(); 1360 l2tp_variant_update(sc, nvar); 1361 1362 mutex_exit(&sc->l2tp_lock); 1363 } 1364 1365 static void 1366 l2tp_set_state(struct l2tp_softc *sc, int state) 1367 { 1368 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 1369 struct l2tp_variant *nvar; 1370 1371 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1372 1373 mutex_enter(&sc->l2tp_lock); 1374 1375 *nvar = *sc->l2tp_var; 1376 psref_target_init(&nvar->lv_psref, lv_psref_class); 1377 nvar->lv_state = state; 1378 membar_producer(); 1379 l2tp_variant_update(sc, nvar); 1380 1381 if (nvar->lv_state == L2TP_STATE_UP) { 1382 ifp->if_link_state = LINK_STATE_UP; 1383 } else { 1384 ifp->if_link_state = LINK_STATE_DOWN; 1385 } 1386 1387 mutex_exit(&sc->l2tp_lock); 1388 1389 #ifdef NOTYET 1390 vlan_linkstate_notify(ifp, ifp->if_link_state); 1391 #endif 1392 } 1393 1394 static int 1395 l2tp_encap_attach(struct l2tp_variant *var) 1396 { 1397 int error; 1398 1399 if (var == NULL || var->lv_psrc == NULL) 1400 return EINVAL; 1401 1402 switch (var->lv_psrc->sa_family) { 1403 #ifdef INET 1404 case AF_INET: 1405 error = in_l2tp_attach(var); 1406 break; 1407 #endif 1408 #ifdef INET6 1409 case AF_INET6: 1410 error = in6_l2tp_attach(var); 1411 break; 1412 #endif 1413 default: 1414 error = EINVAL; 1415 break; 1416 } 1417 1418 return error; 1419 } 1420 1421 static int 1422 l2tp_encap_detach(struct l2tp_variant *var) 1423 { 1424 int error; 1425 1426 if (var == NULL || var->lv_psrc == NULL) 1427 return EINVAL; 1428 1429 switch (var->lv_psrc->sa_family) { 1430 #ifdef INET 1431 case AF_INET: 1432 error = in_l2tp_detach(var); 1433 break; 1434 #endif 1435 #ifdef INET6 1436 case AF_INET6: 1437 error = in6_l2tp_detach(var); 1438 break; 1439 #endif 1440 default: 1441 error = EINVAL; 1442 break; 1443 } 1444 1445 return error; 1446 } 1447 1448 int 1449 l2tp_check_nesting(struct ifnet *ifp, struct mbuf *m) 1450 { 1451 1452 return if_tunnel_check_nesting(ifp, m, max_l2tp_nesting); 1453 } 1454 1455 /* 1456 * Module infrastructure 1457 */ 1458 #include "if_module.h" 1459 1460 IF_MODULE(MODULE_CLASS_DRIVER, l2tp, NULL) 1461 1462 1463 /* TODO: IP_TCPMSS support */ 1464 #ifdef IP_TCPMSS 1465 static int l2tp_need_tcpmss_clamp(struct ifnet *); 1466 #ifdef INET 1467 static struct mbuf *l2tp_tcpmss4_clamp(struct ifnet *, struct mbuf *); 1468 #endif 1469 #ifdef INET6 1470 static struct mbuf *l2tp_tcpmss6_clamp(struct ifnet *, struct mbuf *); 1471 #endif 1472 1473 struct mbuf * 1474 l2tp_tcpmss_clamp(struct ifnet *ifp, struct mbuf *m) 1475 { 1476 struct ether_header *eh; 1477 struct ether_vlan_header evh; 1478 1479 if (!l2tp_need_tcpmss_clamp(ifp)) { 1480 return m; 1481 } 1482 1483 if (m->m_pkthdr.len < sizeof(evh)) { 1484 m_freem(m); 1485 return NULL; 1486 } 1487 1488 /* save ether header */ 1489 m_copydata(m, 0, sizeof(evh), (void *)&evh); 1490 eh = (struct ether_header *)&evh; 1491 1492 switch (ntohs(eh->ether_type)) { 1493 case ETHERTYPE_VLAN: /* Ether + VLAN */ 1494 if (m->m_pkthdr.len <= sizeof(struct ether_vlan_header)) 1495 break; 1496 m_adj(m, sizeof(struct ether_vlan_header)); 1497 switch (ntohs(evh.evl_proto)) { 1498 #ifdef INET 1499 case ETHERTYPE_IP: /* Ether + VLAN + IPv4 */ 1500 m = l2tp_tcpmss4_clamp(ifp, m); 1501 if (m == NULL) 1502 return NULL; 1503 break; 1504 #endif /* INET */ 1505 #ifdef INET6 1506 case ETHERTYPE_IPV6: /* Ether + VLAN + IPv6 */ 1507 m = l2tp_tcpmss6_clamp(ifp, m); 1508 if (m == NULL) 1509 return NULL; 1510 break; 1511 #endif /* INET6 */ 1512 default: 1513 break; 1514 } 1515 1516 /* restore ether header */ 1517 M_PREPEND(m, sizeof(struct ether_vlan_header), 1518 M_DONTWAIT); 1519 if (m == NULL) 1520 return NULL; 1521 *mtod(m, struct ether_vlan_header *) = evh; 1522 break; 1523 1524 #ifdef INET 1525 case ETHERTYPE_IP: /* Ether + IPv4 */ 1526 if (m->m_pkthdr.len <= sizeof(struct ether_header)) 1527 break; 1528 m_adj(m, sizeof(struct ether_header)); 1529 m = l2tp_tcpmss4_clamp(ifp, m); 1530 if (m == NULL) 1531 return NULL; 1532 /* restore ether header */ 1533 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1534 if (m == NULL) 1535 return NULL; 1536 *mtod(m, struct ether_header *) = *eh; 1537 break; 1538 #endif /* INET */ 1539 1540 #ifdef INET6 1541 case ETHERTYPE_IPV6: /* Ether + IPv6 */ 1542 if (m->m_pkthdr.len <= sizeof(struct ether_header)) 1543 break; 1544 m_adj(m, sizeof(struct ether_header)); 1545 m = l2tp_tcpmss6_clamp(ifp, m); 1546 if (m == NULL) 1547 return NULL; 1548 /* restore ether header */ 1549 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1550 if (m == NULL) 1551 return NULL; 1552 *mtod(m, struct ether_header *) = *eh; 1553 break; 1554 #endif /* INET6 */ 1555 1556 default: 1557 break; 1558 } 1559 1560 return m; 1561 } 1562 1563 static int 1564 l2tp_need_tcpmss_clamp(struct ifnet *ifp) 1565 { 1566 int ret = 0; 1567 1568 #ifdef INET 1569 if (ifp->if_tcpmss != 0) 1570 ret = 1; 1571 #endif 1572 1573 #ifdef INET6 1574 if (ifp->if_tcpmss6 != 0) 1575 ret = 1; 1576 #endif 1577 1578 return ret; 1579 } 1580 1581 #ifdef INET 1582 static struct mbuf * 1583 l2tp_tcpmss4_clamp(struct ifnet *ifp, struct mbuf *m) 1584 { 1585 1586 if (ifp->if_tcpmss != 0) { 1587 return ip_tcpmss(m, (ifp->if_tcpmss < 0) ? 1588 ifp->if_mtu - IP_TCPMSS_EXTLEN : 1589 ifp->if_tcpmss); 1590 } 1591 return m; 1592 } 1593 #endif /* INET */ 1594 1595 #ifdef INET6 1596 static struct mbuf * 1597 l2tp_tcpmss6_clamp(struct ifnet *ifp, struct mbuf *m) 1598 { 1599 int ip6hdrlen; 1600 1601 if (ifp->if_tcpmss6 != 0 && 1602 ip6_tcpmss_applicable(m, &ip6hdrlen)) { 1603 return ip6_tcpmss(m, ip6hdrlen, 1604 (ifp->if_tcpmss6 < 0) ? 1605 ifp->if_mtu - IP6_TCPMSS_EXTLEN : 1606 ifp->if_tcpmss6); 1607 } 1608 return m; 1609 } 1610 #endif /* INET6 */ 1611 1612 #endif /* IP_TCPMSS */ 1613
Indexes created Fri Sep 26 20:09:58 GMT 2025