if_l2tp.c revision 1.43
1 /* $NetBSD: if_l2tp.c,v 1.43 2020/02/01 12:54:50 riastradh 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 1.43 2020/02/01 12:54:50 riastradh 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_create(sizeof(struct ifqueue *), 271 l2tp_ifq_init_pc, l2tp_ifq_fini_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_free(sc->l2tp_ifq_percpu, sizeof(struct ifqueue *)); 371 372 mutex_enter(&l2tp_softcs.lock); 373 LIST_REMOVE(sc, l2tp_list); 374 mutex_exit(&l2tp_softcs.lock); 375 376 bpf_detach(ifp); 377 378 if_detach(ifp); 379 380 if_tunnel_free_ro_percpu(sc->l2tp_ro_percpu); 381 382 kmem_free(var, sizeof(struct l2tp_variant)); 383 pserialize_destroy(sc->l2tp_psz); 384 mutex_destroy(&sc->l2tp_lock); 385 kmem_free(sc, sizeof(struct l2tp_softc)); 386 387 return 0; 388 } 389 390 static int 391 l2tp_tx_enqueue(struct l2tp_variant *var, struct mbuf *m) 392 { 393 struct l2tp_softc *sc; 394 struct ifnet *ifp; 395 struct ifqueue *ifq; 396 int s; 397 398 KASSERT(psref_held(&var->lv_psref, lv_psref_class)); 399 400 sc = var->lv_softc; 401 ifp = &sc->l2tp_ec.ec_if; 402 403 s = splsoftnet(); 404 ifq = l2tp_ifq_percpu_getref(sc->l2tp_ifq_percpu); 405 if (IF_QFULL(ifq)) { 406 if_statinc(ifp, if_oerrors); 407 l2tp_ifq_percpu_putref(sc->l2tp_ifq_percpu); 408 splx(s); 409 m_freem(m); 410 return ENOBUFS; 411 } 412 413 IF_ENQUEUE(ifq, m); 414 percpu_putref(sc->l2tp_ifq_percpu); 415 softint_schedule(sc->l2tp_si); 416 /* counter is incremented in l2tpintr() */ 417 splx(s); 418 return 0; 419 } 420 421 static int 422 l2tp_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 423 const struct rtentry *rt) 424 { 425 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 426 l2tp_ec.ec_if); 427 struct l2tp_variant *var; 428 struct psref psref; 429 int error = 0; 430 431 var = l2tp_getref_variant(sc, &psref); 432 if (var == NULL) { 433 m_freem(m); 434 return ENETDOWN; 435 } 436 437 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family); 438 439 m->m_flags &= ~(M_BCAST|M_MCAST); 440 441 if ((ifp->if_flags & IFF_UP) == 0) { 442 m_freem(m); 443 error = ENETDOWN; 444 goto end; 445 } 446 447 if (var->lv_psrc == NULL || var->lv_pdst == NULL) { 448 m_freem(m); 449 error = ENETDOWN; 450 goto end; 451 } 452 453 /* XXX should we check if our outer source is legal? */ 454 455 /* use DLT_NULL encapsulation here to pass inner af type */ 456 M_PREPEND(m, sizeof(int), M_DONTWAIT); 457 if (!m) { 458 error = ENOBUFS; 459 goto end; 460 } 461 *mtod(m, int *) = dst->sa_family; 462 463 error = l2tp_tx_enqueue(var, m); 464 end: 465 l2tp_putref_variant(var, &psref); 466 if (error) 467 if_statinc(ifp, if_oerrors); 468 469 return error; 470 } 471 472 static void 473 l2tp_sendit(struct l2tp_variant *var, struct mbuf *m) 474 { 475 int len; 476 int error; 477 struct l2tp_softc *sc; 478 struct ifnet *ifp; 479 480 KASSERT(psref_held(&var->lv_psref, lv_psref_class)); 481 482 sc = var->lv_softc; 483 ifp = &sc->l2tp_ec.ec_if; 484 485 len = m->m_pkthdr.len; 486 m->m_flags &= ~(M_BCAST|M_MCAST); 487 bpf_mtap(ifp, m, BPF_D_OUT); 488 489 switch (var->lv_psrc->sa_family) { 490 #ifdef INET 491 case AF_INET: 492 error = in_l2tp_output(var, m); 493 break; 494 #endif 495 #ifdef INET6 496 case AF_INET6: 497 error = in6_l2tp_output(var, m); 498 break; 499 #endif 500 default: 501 m_freem(m); 502 error = ENETDOWN; 503 break; 504 } 505 if (error) { 506 if_statinc(ifp, if_oerrors); 507 } else { 508 if_statadd2(ifp, if_opackets, 1, if_obytes, len); 509 } 510 } 511 512 static void 513 l2tpintr(struct l2tp_variant *var) 514 { 515 struct l2tp_softc *sc; 516 struct ifnet *ifp; 517 struct mbuf *m; 518 struct ifqueue *ifq; 519 u_int cpuid = cpu_index(curcpu()); 520 521 KASSERT(psref_held(&var->lv_psref, lv_psref_class)); 522 523 sc = var->lv_softc; 524 ifp = &sc->l2tp_ec.ec_if; 525 526 /* output processing */ 527 if (var->lv_my_sess_id == 0 || var->lv_peer_sess_id == 0) { 528 ifq = l2tp_ifq_percpu_getref(sc->l2tp_ifq_percpu); 529 IF_PURGE(ifq); 530 l2tp_ifq_percpu_putref(sc->l2tp_ifq_percpu); 531 if (cpuid == 0) 532 IFQ_PURGE(&ifp->if_snd); 533 return; 534 } 535 536 /* Currently, l2tpintr() is always called in softint context. */ 537 ifq = l2tp_ifq_percpu_getref(sc->l2tp_ifq_percpu); 538 for (;;) { 539 IF_DEQUEUE(ifq, m); 540 if (m != NULL) 541 l2tp_sendit(var, m); 542 else 543 break; 544 } 545 l2tp_ifq_percpu_putref(sc->l2tp_ifq_percpu); 546 547 if (cpuid == 0) { 548 for (;;) { 549 IFQ_DEQUEUE(&ifp->if_snd, m); 550 if (m != NULL) 551 l2tp_sendit(var, m); 552 else 553 break; 554 } 555 } 556 } 557 558 static void 559 l2tpintr_softint(void *arg) 560 { 561 struct l2tp_variant *var; 562 struct psref psref; 563 struct l2tp_softc *sc = arg; 564 565 var = l2tp_getref_variant(sc, &psref); 566 if (var == NULL) 567 return; 568 569 l2tpintr(var); 570 l2tp_putref_variant(var, &psref); 571 } 572 573 void 574 l2tp_input(struct mbuf *m, struct ifnet *ifp) 575 { 576 vaddr_t addr; 577 578 KASSERT(ifp != NULL); 579 580 /* 581 * Currently, l2tp(4) supports only ethernet as inner protocol. 582 */ 583 if (m->m_pkthdr.len < sizeof(struct ether_header)) { 584 m_freem(m); 585 return; 586 } 587 588 /* 589 * If the head of the payload is not aligned, align it. 590 */ 591 addr = mtod(m, vaddr_t); 592 if ((addr & 0x03) != 0x2) { 593 /* copy and align head of payload */ 594 struct mbuf *m_head; 595 int copy_length; 596 u_int pad = roundup(sizeof(struct ether_header), 4) 597 - sizeof(struct ether_header); 598 599 #define L2TP_COPY_LENGTH 60 600 601 if (m->m_pkthdr.len < L2TP_COPY_LENGTH) { 602 copy_length = m->m_pkthdr.len; 603 } else { 604 copy_length = L2TP_COPY_LENGTH; 605 } 606 607 if (m->m_len < copy_length) { 608 m = m_pullup(m, copy_length); 609 if (m == NULL) 610 return; 611 } 612 613 MGETHDR(m_head, M_DONTWAIT, MT_HEADER); 614 if (m_head == NULL) { 615 m_freem(m); 616 return; 617 } 618 m_move_pkthdr(m_head, m); 619 620 /* 621 * m_head should be: 622 * L2TP_COPY_LENGTH 623 * <- + roundup(pad, 4) - pad -> 624 * +-------+--------+-----+--------------+-------------+ 625 * | m_hdr | pkthdr | ... | ether header | payload | 626 * +-------+--------+-----+--------------+-------------+ 627 * ^ ^ 628 * m_data 4 byte aligned 629 */ 630 m_align(m_head, L2TP_COPY_LENGTH + roundup(pad, 4)); 631 m_head->m_data += pad; 632 633 memcpy(mtod(m_head, void *), mtod(m, void *), copy_length); 634 m_head->m_len = copy_length; 635 m->m_data += copy_length; 636 m->m_len -= copy_length; 637 638 /* construct chain */ 639 if (m->m_len == 0) { 640 m_head->m_next = m_free(m); 641 } else { 642 m_head->m_next = m; 643 } 644 645 /* override m */ 646 m = m_head; 647 } 648 649 m_set_rcvif(m, ifp); 650 651 /* 652 * bpf_mtap() and ifp->if_ipackets++ is done in if_input() 653 * 654 * obytes is incremented at ether_output() or bridge_enqueue(). 655 */ 656 if_percpuq_enqueue(ifp->if_percpuq, m); 657 } 658 659 void 660 l2tp_start(struct ifnet *ifp) 661 { 662 struct psref psref; 663 struct l2tp_variant *var; 664 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 665 l2tp_ec.ec_if); 666 667 var = l2tp_getref_variant(sc, &psref); 668 if (var == NULL) 669 return; 670 671 if (var->lv_psrc == NULL || var->lv_pdst == NULL) 672 return; 673 674 kpreempt_disable(); 675 softint_schedule(sc->l2tp_si); 676 kpreempt_enable(); 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 l2tp_variant_update(sc, nvar); 1064 1065 mutex_exit(&sc->l2tp_lock); 1066 1067 (void)l2tp_encap_detach(ovar); 1068 encap_lock_exit(); 1069 1070 if (osrc) 1071 sockaddr_free(osrc); 1072 if (odst) 1073 sockaddr_free(odst); 1074 kmem_free(ovar, sizeof(*ovar)); 1075 1076 return 0; 1077 1078 error: 1079 sockaddr_free(nsrc); 1080 sockaddr_free(ndst); 1081 kmem_free(nvar, sizeof(*nvar)); 1082 1083 return error; 1084 } 1085 1086 static void 1087 l2tp_delete_tunnel(struct ifnet *ifp) 1088 { 1089 struct l2tp_softc *sc = container_of(ifp, struct l2tp_softc, 1090 l2tp_ec.ec_if); 1091 struct sockaddr *osrc, *odst; 1092 struct l2tp_variant *ovar, *nvar; 1093 int error; 1094 1095 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1096 1097 error = encap_lock_enter(); 1098 if (error) { 1099 kmem_free(nvar, sizeof(*nvar)); 1100 return; 1101 } 1102 mutex_enter(&sc->l2tp_lock); 1103 1104 ovar = sc->l2tp_var; 1105 osrc = ovar->lv_psrc; 1106 odst = ovar->lv_pdst; 1107 *nvar = *ovar; 1108 psref_target_init(&nvar->lv_psref, lv_psref_class); 1109 nvar->lv_psrc = NULL; 1110 nvar->lv_pdst = NULL; 1111 l2tp_variant_update(sc, nvar); 1112 1113 mutex_exit(&sc->l2tp_lock); 1114 1115 (void)l2tp_encap_detach(ovar); 1116 encap_lock_exit(); 1117 1118 if (osrc) 1119 sockaddr_free(osrc); 1120 if (odst) 1121 sockaddr_free(odst); 1122 kmem_free(ovar, sizeof(*ovar)); 1123 } 1124 1125 static int 1126 id_hash_func(uint32_t id, u_long mask) 1127 { 1128 uint32_t hash; 1129 1130 hash = (id >> 16) ^ id; 1131 hash = (hash >> 4) ^ hash; 1132 1133 return hash & mask; 1134 } 1135 1136 static void 1137 l2tp_hash_init(void) 1138 { 1139 1140 l2tp_hash.lists = hashinit(L2TP_ID_HASH_SIZE, HASH_PSLIST, true, 1141 &l2tp_hash.mask); 1142 } 1143 1144 static int 1145 l2tp_hash_fini(void) 1146 { 1147 int i; 1148 1149 mutex_enter(&l2tp_hash.lock); 1150 1151 for (i = 0; i < l2tp_hash.mask + 1; i++) { 1152 if (PSLIST_WRITER_FIRST(&l2tp_hash.lists[i], struct l2tp_softc, 1153 l2tp_hash) != NULL) { 1154 mutex_exit(&l2tp_hash.lock); 1155 return EBUSY; 1156 } 1157 } 1158 for (i = 0; i < l2tp_hash.mask + 1; i++) 1159 PSLIST_DESTROY(&l2tp_hash.lists[i]); 1160 1161 mutex_exit(&l2tp_hash.lock); 1162 1163 hashdone(l2tp_hash.lists, HASH_PSLIST, l2tp_hash.mask); 1164 1165 return 0; 1166 } 1167 1168 static int 1169 l2tp_set_session(struct l2tp_softc *sc, uint32_t my_sess_id, 1170 uint32_t peer_sess_id) 1171 { 1172 uint32_t idx; 1173 struct l2tp_variant *nvar; 1174 struct l2tp_variant *ovar; 1175 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 1176 1177 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1178 1179 mutex_enter(&sc->l2tp_lock); 1180 ovar = sc->l2tp_var; 1181 *nvar = *ovar; 1182 psref_target_init(&nvar->lv_psref, lv_psref_class); 1183 nvar->lv_my_sess_id = my_sess_id; 1184 nvar->lv_peer_sess_id = peer_sess_id; 1185 1186 mutex_enter(&l2tp_hash.lock); 1187 if (ovar->lv_my_sess_id > 0 && ovar->lv_peer_sess_id > 0) { 1188 PSLIST_WRITER_REMOVE(sc, l2tp_hash); 1189 pserialize_perform(l2tp_psz); 1190 } 1191 mutex_exit(&l2tp_hash.lock); 1192 PSLIST_ENTRY_DESTROY(sc, l2tp_hash); 1193 1194 l2tp_variant_update(sc, nvar); 1195 mutex_exit(&sc->l2tp_lock); 1196 1197 idx = id_hash_func(nvar->lv_my_sess_id, l2tp_hash.mask); 1198 if ((ifp->if_flags & IFF_DEBUG) != 0) 1199 log(LOG_DEBUG, "%s: add hash entry: sess_id=%" PRIu32 ", idx=%" PRIu32 "\n", 1200 sc->l2tp_ec.ec_if.if_xname, nvar->lv_my_sess_id, idx); 1201 1202 PSLIST_ENTRY_INIT(sc, l2tp_hash); 1203 mutex_enter(&l2tp_hash.lock); 1204 PSLIST_WRITER_INSERT_HEAD(&l2tp_hash.lists[idx], sc, l2tp_hash); 1205 mutex_exit(&l2tp_hash.lock); 1206 1207 kmem_free(ovar, sizeof(*ovar)); 1208 return 0; 1209 } 1210 1211 static int 1212 l2tp_clear_session(struct l2tp_softc *sc) 1213 { 1214 struct l2tp_variant *nvar; 1215 struct l2tp_variant *ovar; 1216 1217 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1218 1219 mutex_enter(&sc->l2tp_lock); 1220 ovar = sc->l2tp_var; 1221 *nvar = *ovar; 1222 psref_target_init(&nvar->lv_psref, lv_psref_class); 1223 nvar->lv_my_sess_id = 0; 1224 nvar->lv_peer_sess_id = 0; 1225 1226 mutex_enter(&l2tp_hash.lock); 1227 if (ovar->lv_my_sess_id > 0 && ovar->lv_peer_sess_id > 0) { 1228 PSLIST_WRITER_REMOVE(sc, l2tp_hash); 1229 pserialize_perform(l2tp_psz); 1230 } 1231 mutex_exit(&l2tp_hash.lock); 1232 1233 l2tp_variant_update(sc, nvar); 1234 mutex_exit(&sc->l2tp_lock); 1235 kmem_free(ovar, sizeof(*ovar)); 1236 return 0; 1237 } 1238 1239 struct l2tp_variant * 1240 l2tp_lookup_session_ref(uint32_t id, struct psref *psref) 1241 { 1242 int idx; 1243 int s; 1244 struct l2tp_softc *sc; 1245 1246 idx = id_hash_func(id, l2tp_hash.mask); 1247 1248 s = pserialize_read_enter(); 1249 PSLIST_READER_FOREACH(sc, &l2tp_hash.lists[idx], struct l2tp_softc, 1250 l2tp_hash) { 1251 struct l2tp_variant *var = atomic_load_consume(&sc->l2tp_var); 1252 if (var == NULL) 1253 continue; 1254 if (var->lv_my_sess_id != id) 1255 continue; 1256 psref_acquire(psref, &var->lv_psref, lv_psref_class); 1257 pserialize_read_exit(s); 1258 return var; 1259 } 1260 pserialize_read_exit(s); 1261 return NULL; 1262 } 1263 1264 /* 1265 * l2tp_variant update API. 1266 * 1267 * Assumption: 1268 * reader side dereferences sc->l2tp_var in reader critical section only, 1269 * that is, all of reader sides do not reader the sc->l2tp_var after 1270 * pserialize_perform(). 1271 */ 1272 static void 1273 l2tp_variant_update(struct l2tp_softc *sc, struct l2tp_variant *nvar) 1274 { 1275 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 1276 struct l2tp_variant *ovar = sc->l2tp_var; 1277 1278 KASSERT(mutex_owned(&sc->l2tp_lock)); 1279 1280 atomic_store_release(&sc->l2tp_var, nvar); 1281 pserialize_perform(sc->l2tp_psz); 1282 psref_target_destroy(&ovar->lv_psref, lv_psref_class); 1283 1284 if (nvar != NULL) { 1285 if (nvar->lv_psrc != NULL && nvar->lv_pdst != NULL) 1286 ifp->if_flags |= IFF_RUNNING; 1287 else 1288 ifp->if_flags &= ~IFF_RUNNING; 1289 } 1290 } 1291 1292 static int 1293 l2tp_set_cookie(struct l2tp_softc *sc, uint64_t my_cookie, u_int my_cookie_len, 1294 uint64_t peer_cookie, u_int peer_cookie_len) 1295 { 1296 struct l2tp_variant *nvar; 1297 1298 if (my_cookie == 0 || peer_cookie == 0) 1299 return EINVAL; 1300 1301 if (my_cookie_len != 4 && my_cookie_len != 8 1302 && peer_cookie_len != 4 && peer_cookie_len != 8) 1303 return EINVAL; 1304 1305 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1306 1307 mutex_enter(&sc->l2tp_lock); 1308 1309 *nvar = *sc->l2tp_var; 1310 psref_target_init(&nvar->lv_psref, lv_psref_class); 1311 nvar->lv_my_cookie = my_cookie; 1312 nvar->lv_my_cookie_len = my_cookie_len; 1313 nvar->lv_peer_cookie = peer_cookie; 1314 nvar->lv_peer_cookie_len = peer_cookie_len; 1315 nvar->lv_use_cookie = L2TP_COOKIE_ON; 1316 l2tp_variant_update(sc, nvar); 1317 1318 mutex_exit(&sc->l2tp_lock); 1319 1320 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 1321 if ((ifp->if_flags & IFF_DEBUG) != 0) { 1322 log(LOG_DEBUG, 1323 "%s: set cookie: " 1324 "local cookie_len=%u local cookie=%" PRIu64 ", " 1325 "remote cookie_len=%u remote cookie=%" PRIu64 "\n", 1326 ifp->if_xname, my_cookie_len, my_cookie, 1327 peer_cookie_len, peer_cookie); 1328 } 1329 1330 return 0; 1331 } 1332 1333 static void 1334 l2tp_clear_cookie(struct l2tp_softc *sc) 1335 { 1336 struct l2tp_variant *nvar; 1337 1338 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1339 1340 mutex_enter(&sc->l2tp_lock); 1341 1342 *nvar = *sc->l2tp_var; 1343 psref_target_init(&nvar->lv_psref, lv_psref_class); 1344 nvar->lv_my_cookie = 0; 1345 nvar->lv_my_cookie_len = 0; 1346 nvar->lv_peer_cookie = 0; 1347 nvar->lv_peer_cookie_len = 0; 1348 nvar->lv_use_cookie = L2TP_COOKIE_OFF; 1349 l2tp_variant_update(sc, nvar); 1350 1351 mutex_exit(&sc->l2tp_lock); 1352 } 1353 1354 static void 1355 l2tp_set_state(struct l2tp_softc *sc, int state) 1356 { 1357 struct ifnet *ifp = &sc->l2tp_ec.ec_if; 1358 struct l2tp_variant *nvar; 1359 1360 nvar = kmem_alloc(sizeof(*nvar), KM_SLEEP); 1361 1362 mutex_enter(&sc->l2tp_lock); 1363 1364 *nvar = *sc->l2tp_var; 1365 psref_target_init(&nvar->lv_psref, lv_psref_class); 1366 nvar->lv_state = state; 1367 l2tp_variant_update(sc, nvar); 1368 1369 if (nvar->lv_state == L2TP_STATE_UP) { 1370 ifp->if_link_state = LINK_STATE_UP; 1371 } else { 1372 ifp->if_link_state = LINK_STATE_DOWN; 1373 } 1374 1375 mutex_exit(&sc->l2tp_lock); 1376 1377 #ifdef NOTYET 1378 vlan_linkstate_notify(ifp, ifp->if_link_state); 1379 #endif 1380 } 1381 1382 static int 1383 l2tp_encap_attach(struct l2tp_variant *var) 1384 { 1385 int error; 1386 1387 if (var == NULL || var->lv_psrc == NULL) 1388 return EINVAL; 1389 1390 switch (var->lv_psrc->sa_family) { 1391 #ifdef INET 1392 case AF_INET: 1393 error = in_l2tp_attach(var); 1394 break; 1395 #endif 1396 #ifdef INET6 1397 case AF_INET6: 1398 error = in6_l2tp_attach(var); 1399 break; 1400 #endif 1401 default: 1402 error = EINVAL; 1403 break; 1404 } 1405 1406 return error; 1407 } 1408 1409 static int 1410 l2tp_encap_detach(struct l2tp_variant *var) 1411 { 1412 int error; 1413 1414 if (var == NULL || var->lv_psrc == NULL) 1415 return EINVAL; 1416 1417 switch (var->lv_psrc->sa_family) { 1418 #ifdef INET 1419 case AF_INET: 1420 error = in_l2tp_detach(var); 1421 break; 1422 #endif 1423 #ifdef INET6 1424 case AF_INET6: 1425 error = in6_l2tp_detach(var); 1426 break; 1427 #endif 1428 default: 1429 error = EINVAL; 1430 break; 1431 } 1432 1433 return error; 1434 } 1435 1436 int 1437 l2tp_check_nesting(struct ifnet *ifp, struct mbuf *m) 1438 { 1439 1440 return if_tunnel_check_nesting(ifp, m, max_l2tp_nesting); 1441 } 1442 1443 /* 1444 * Module infrastructure 1445 */ 1446 #include "if_module.h" 1447 1448 IF_MODULE(MODULE_CLASS_DRIVER, l2tp, NULL) 1449 1450 1451 /* TODO: IP_TCPMSS support */ 1452 #ifdef IP_TCPMSS 1453 static int l2tp_need_tcpmss_clamp(struct ifnet *); 1454 #ifdef INET 1455 static struct mbuf *l2tp_tcpmss4_clamp(struct ifnet *, struct mbuf *); 1456 #endif 1457 #ifdef INET6 1458 static struct mbuf *l2tp_tcpmss6_clamp(struct ifnet *, struct mbuf *); 1459 #endif 1460 1461 struct mbuf * 1462 l2tp_tcpmss_clamp(struct ifnet *ifp, struct mbuf *m) 1463 { 1464 struct ether_header *eh; 1465 struct ether_vlan_header evh; 1466 1467 if (!l2tp_need_tcpmss_clamp(ifp)) { 1468 return m; 1469 } 1470 1471 if (m->m_pkthdr.len < sizeof(evh)) { 1472 m_freem(m); 1473 return NULL; 1474 } 1475 1476 /* save ether header */ 1477 m_copydata(m, 0, sizeof(evh), (void *)&evh); 1478 eh = (struct ether_header *)&evh; 1479 1480 switch (ntohs(eh->ether_type)) { 1481 case ETHERTYPE_VLAN: /* Ether + VLAN */ 1482 if (m->m_pkthdr.len <= sizeof(struct ether_vlan_header)) 1483 break; 1484 m_adj(m, sizeof(struct ether_vlan_header)); 1485 switch (ntohs(evh.evl_proto)) { 1486 #ifdef INET 1487 case ETHERTYPE_IP: /* Ether + VLAN + IPv4 */ 1488 m = l2tp_tcpmss4_clamp(ifp, m); 1489 if (m == NULL) 1490 return NULL; 1491 break; 1492 #endif /* INET */ 1493 #ifdef INET6 1494 case ETHERTYPE_IPV6: /* Ether + VLAN + IPv6 */ 1495 m = l2tp_tcpmss6_clamp(ifp, m); 1496 if (m == NULL) 1497 return NULL; 1498 break; 1499 #endif /* INET6 */ 1500 default: 1501 break; 1502 } 1503 1504 /* restore ether header */ 1505 M_PREPEND(m, sizeof(struct ether_vlan_header), 1506 M_DONTWAIT); 1507 if (m == NULL) 1508 return NULL; 1509 *mtod(m, struct ether_vlan_header *) = evh; 1510 break; 1511 1512 #ifdef INET 1513 case ETHERTYPE_IP: /* Ether + IPv4 */ 1514 if (m->m_pkthdr.len <= sizeof(struct ether_header)) 1515 break; 1516 m_adj(m, sizeof(struct ether_header)); 1517 m = l2tp_tcpmss4_clamp(ifp, m); 1518 if (m == NULL) 1519 return NULL; 1520 /* restore ether header */ 1521 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1522 if (m == NULL) 1523 return NULL; 1524 *mtod(m, struct ether_header *) = *eh; 1525 break; 1526 #endif /* INET */ 1527 1528 #ifdef INET6 1529 case ETHERTYPE_IPV6: /* Ether + IPv6 */ 1530 if (m->m_pkthdr.len <= sizeof(struct ether_header)) 1531 break; 1532 m_adj(m, sizeof(struct ether_header)); 1533 m = l2tp_tcpmss6_clamp(ifp, m); 1534 if (m == NULL) 1535 return NULL; 1536 /* restore ether header */ 1537 M_PREPEND(m, sizeof(struct ether_header), M_DONTWAIT); 1538 if (m == NULL) 1539 return NULL; 1540 *mtod(m, struct ether_header *) = *eh; 1541 break; 1542 #endif /* INET6 */ 1543 1544 default: 1545 break; 1546 } 1547 1548 return m; 1549 } 1550 1551 static int 1552 l2tp_need_tcpmss_clamp(struct ifnet *ifp) 1553 { 1554 int ret = 0; 1555 1556 #ifdef INET 1557 if (ifp->if_tcpmss != 0) 1558 ret = 1; 1559 #endif 1560 1561 #ifdef INET6 1562 if (ifp->if_tcpmss6 != 0) 1563 ret = 1; 1564 #endif 1565 1566 return ret; 1567 } 1568 1569 #ifdef INET 1570 static struct mbuf * 1571 l2tp_tcpmss4_clamp(struct ifnet *ifp, struct mbuf *m) 1572 { 1573 1574 if (ifp->if_tcpmss != 0) { 1575 return ip_tcpmss(m, (ifp->if_tcpmss < 0) ? 1576 ifp->if_mtu - IP_TCPMSS_EXTLEN : 1577 ifp->if_tcpmss); 1578 } 1579 return m; 1580 } 1581 #endif /* INET */ 1582 1583 #ifdef INET6 1584 static struct mbuf * 1585 l2tp_tcpmss6_clamp(struct ifnet *ifp, struct mbuf *m) 1586 { 1587 int ip6hdrlen; 1588 1589 if (ifp->if_tcpmss6 != 0 && 1590 ip6_tcpmss_applicable(m, &ip6hdrlen)) { 1591 return ip6_tcpmss(m, ip6hdrlen, 1592 (ifp->if_tcpmss6 < 0) ? 1593 ifp->if_mtu - IP6_TCPMSS_EXTLEN : 1594 ifp->if_tcpmss6); 1595 } 1596 return m; 1597 } 1598 #endif /* INET6 */ 1599 1600 #endif /* IP_TCPMSS */ 1601
Indexes created Fri Sep 26 20:09:58 GMT 2025