1 /*- 2 * Copyright (c) 2014, 2018 Andrey V. Elsukov <ae@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <sys/systm.h> 32 #include <sys/jail.h> 33 #include <sys/kernel.h> 34 #include <sys/lock.h> 35 #include <sys/malloc.h> 36 #include <sys/module.h> 37 #include <sys/mbuf.h> 38 #include <sys/priv.h> 39 #include <sys/proc.h> 40 #include <sys/socket.h> 41 #include <sys/sockio.h> 42 #include <sys/sx.h> 43 #include <sys/sysctl.h> 44 #include <sys/syslog.h> 45 46 #include <net/bpf.h> 47 #include <net/ethernet.h> 48 #include <net/if.h> 49 #include <net/if_var.h> 50 #include <net/if_clone.h> 51 #include <net/if_types.h> 52 #include <net/netisr.h> 53 #include <net/vnet.h> 54 #include <net/route.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 #include <netinet/in_var.h> 59 #include <netinet/ip.h> 60 #include <netinet/ip_var.h> 61 #include <netinet/ip_encap.h> 62 63 #include <machine/in_cksum.h> 64 #include <security/mac/mac_framework.h> 65 66 #define MEMTU (1500 - sizeof(struct mobhdr)) 67 static const char mename[] = "me"; 68 static MALLOC_DEFINE(M_IFME, mename, "Minimal Encapsulation for IP"); 69 /* Minimal forwarding header RFC 2004 */ 70 struct mobhdr { 71 uint8_t mob_proto; /* protocol */ 72 uint8_t mob_flags; /* flags */ 73 #define MOB_FLAGS_SP 0x80 /* source present */ 74 uint16_t mob_csum; /* header checksum */ 75 struct in_addr mob_dst; /* original destination address */ 76 struct in_addr mob_src; /* original source addr (optional) */ 77 } __packed; 78 79 struct me_softc { 80 struct ifnet *me_ifp; 81 u_int me_fibnum; 82 struct in_addr me_src; 83 struct in_addr me_dst; 84 85 CK_LIST_ENTRY(me_softc) chain; 86 CK_LIST_ENTRY(me_softc) srchash; 87 }; 88 CK_LIST_HEAD(me_list, me_softc); 89 #define ME2IFP(sc) ((sc)->me_ifp) 90 #define ME_READY(sc) ((sc)->me_src.s_addr != 0) 91 #define ME_RLOCK_TRACKER struct epoch_tracker me_et 92 #define ME_RLOCK() epoch_enter_preempt(net_epoch_preempt, &me_et) 93 #define ME_RUNLOCK() epoch_exit_preempt(net_epoch_preempt, &me_et) 94 #define ME_WAIT() epoch_wait_preempt(net_epoch_preempt) 95 96 #ifndef ME_HASH_SIZE 97 #define ME_HASH_SIZE (1 << 4) 98 #endif 99 VNET_DEFINE_STATIC(struct me_list *, me_hashtbl) = NULL; 100 VNET_DEFINE_STATIC(struct me_list *, me_srchashtbl) = NULL; 101 #define V_me_hashtbl VNET(me_hashtbl) 102 #define V_me_srchashtbl VNET(me_srchashtbl) 103 #define ME_HASH(src, dst) (V_me_hashtbl[\ 104 me_hashval((src), (dst)) & (ME_HASH_SIZE - 1)]) 105 #define ME_SRCHASH(src) (V_me_srchashtbl[\ 106 fnv_32_buf(&(src), sizeof(src), FNV1_32_INIT) & (ME_HASH_SIZE - 1)]) 107 108 static struct sx me_ioctl_sx; 109 SX_SYSINIT(me_ioctl_sx, &me_ioctl_sx, "me_ioctl"); 110 111 static int me_clone_create(struct if_clone *, int, caddr_t); 112 static void me_clone_destroy(struct ifnet *); 113 VNET_DEFINE_STATIC(struct if_clone *, me_cloner); 114 #define V_me_cloner VNET(me_cloner) 115 116 static void me_qflush(struct ifnet *); 117 static int me_transmit(struct ifnet *, struct mbuf *); 118 static int me_ioctl(struct ifnet *, u_long, caddr_t); 119 static int me_output(struct ifnet *, struct mbuf *, 120 const struct sockaddr *, struct route *); 121 static int me_input(struct mbuf *, int, int, void *); 122 123 static int me_set_tunnel(struct me_softc *, in_addr_t, in_addr_t); 124 static void me_delete_tunnel(struct me_softc *); 125 126 SYSCTL_DECL(_net_link); 127 static SYSCTL_NODE(_net_link, IFT_TUNNEL, me, CTLFLAG_RW, 0, 128 "Minimal Encapsulation for IP (RFC 2004)"); 129 #ifndef MAX_ME_NEST 130 #define MAX_ME_NEST 1 131 #endif 132 133 VNET_DEFINE_STATIC(int, max_me_nesting) = MAX_ME_NEST; 134 #define V_max_me_nesting VNET(max_me_nesting) 135 SYSCTL_INT(_net_link_me, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET, 136 &VNET_NAME(max_me_nesting), 0, "Max nested tunnels"); 137 138 static uint32_t 139 me_hashval(in_addr_t src, in_addr_t dst) 140 { 141 uint32_t ret; 142 143 ret = fnv_32_buf(&src, sizeof(src), FNV1_32_INIT); 144 return (fnv_32_buf(&dst, sizeof(dst), ret)); 145 } 146 147 static struct me_list * 148 me_hashinit(void) 149 { 150 struct me_list *hash; 151 int i; 152 153 hash = malloc(sizeof(struct me_list) * ME_HASH_SIZE, 154 M_IFME, M_WAITOK); 155 for (i = 0; i < ME_HASH_SIZE; i++) 156 CK_LIST_INIT(&hash[i]); 157 158 return (hash); 159 } 160 161 static void 162 vnet_me_init(const void *unused __unused) 163 { 164 V_me_cloner = if_clone_simple(mename, me_clone_create, 165 me_clone_destroy, 0); 166 } 167 VNET_SYSINIT(vnet_me_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 168 vnet_me_init, NULL); 169 170 static void 171 vnet_me_uninit(const void *unused __unused) 172 { 173 174 if (V_me_hashtbl != NULL) { 175 free(V_me_hashtbl, M_IFME); 176 free(V_me_srchashtbl, M_IFME); 177 } 178 if_clone_detach(V_me_cloner); 179 } 180 VNET_SYSUNINIT(vnet_me_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 181 vnet_me_uninit, NULL); 182 183 static int 184 me_clone_create(struct if_clone *ifc, int unit, caddr_t params) 185 { 186 struct me_softc *sc; 187 188 sc = malloc(sizeof(struct me_softc), M_IFME, M_WAITOK | M_ZERO); 189 sc->me_fibnum = curthread->td_proc->p_fibnum; 190 ME2IFP(sc) = if_alloc(IFT_TUNNEL); 191 ME2IFP(sc)->if_softc = sc; 192 if_initname(ME2IFP(sc), mename, unit); 193 194 ME2IFP(sc)->if_mtu = MEMTU;; 195 ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 196 ME2IFP(sc)->if_output = me_output; 197 ME2IFP(sc)->if_ioctl = me_ioctl; 198 ME2IFP(sc)->if_transmit = me_transmit; 199 ME2IFP(sc)->if_qflush = me_qflush; 200 ME2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE; 201 ME2IFP(sc)->if_capenable |= IFCAP_LINKSTATE; 202 if_attach(ME2IFP(sc)); 203 bpfattach(ME2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 204 return (0); 205 } 206 207 static void 208 me_clone_destroy(struct ifnet *ifp) 209 { 210 struct me_softc *sc; 211 212 sx_xlock(&me_ioctl_sx); 213 sc = ifp->if_softc; 214 me_delete_tunnel(sc); 215 bpfdetach(ifp); 216 if_detach(ifp); 217 ifp->if_softc = NULL; 218 sx_xunlock(&me_ioctl_sx); 219 220 ME_WAIT(); 221 if_free(ifp); 222 free(sc, M_IFME); 223 } 224 225 static int 226 me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 227 { 228 struct ifreq *ifr = (struct ifreq *)data; 229 struct sockaddr_in *src, *dst; 230 struct me_softc *sc; 231 int error; 232 233 switch (cmd) { 234 case SIOCSIFMTU: 235 if (ifr->ifr_mtu < 576) 236 return (EINVAL); 237 ifp->if_mtu = ifr->ifr_mtu; 238 return (0); 239 case SIOCSIFADDR: 240 ifp->if_flags |= IFF_UP; 241 case SIOCSIFFLAGS: 242 case SIOCADDMULTI: 243 case SIOCDELMULTI: 244 return (0); 245 } 246 sx_xlock(&me_ioctl_sx); 247 sc = ifp->if_softc; 248 if (sc == NULL) { 249 error = ENXIO; 250 goto end; 251 } 252 error = 0; 253 switch (cmd) { 254 case SIOCSIFPHYADDR: 255 src = &((struct in_aliasreq *)data)->ifra_addr; 256 dst = &((struct in_aliasreq *)data)->ifra_dstaddr; 257 if (src->sin_family != dst->sin_family || 258 src->sin_family != AF_INET || 259 src->sin_len != dst->sin_len || 260 src->sin_len != sizeof(struct sockaddr_in)) { 261 error = EINVAL; 262 break; 263 } 264 if (src->sin_addr.s_addr == INADDR_ANY || 265 dst->sin_addr.s_addr == INADDR_ANY) { 266 error = EADDRNOTAVAIL; 267 break; 268 } 269 error = me_set_tunnel(sc, src->sin_addr.s_addr, 270 dst->sin_addr.s_addr); 271 break; 272 case SIOCDIFPHYADDR: 273 me_delete_tunnel(sc); 274 break; 275 case SIOCGIFPSRCADDR: 276 case SIOCGIFPDSTADDR: 277 if (!ME_READY(sc)) { 278 error = EADDRNOTAVAIL; 279 break; 280 } 281 src = (struct sockaddr_in *)&ifr->ifr_addr; 282 memset(src, 0, sizeof(*src)); 283 src->sin_family = AF_INET; 284 src->sin_len = sizeof(*src); 285 switch (cmd) { 286 case SIOCGIFPSRCADDR: 287 src->sin_addr = sc->me_src; 288 break; 289 case SIOCGIFPDSTADDR: 290 src->sin_addr = sc->me_dst; 291 break; 292 } 293 error = prison_if(curthread->td_ucred, sintosa(src)); 294 if (error != 0) 295 memset(src, 0, sizeof(*src)); 296 break; 297 case SIOCGTUNFIB: 298 ifr->ifr_fib = sc->me_fibnum; 299 break; 300 case SIOCSTUNFIB: 301 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 302 break; 303 if (ifr->ifr_fib >= rt_numfibs) 304 error = EINVAL; 305 else 306 sc->me_fibnum = ifr->ifr_fib; 307 break; 308 default: 309 error = EINVAL; 310 break; 311 } 312 end: 313 sx_xunlock(&me_ioctl_sx); 314 return (error); 315 } 316 317 static int 318 me_lookup(const struct mbuf *m, int off, int proto, void **arg) 319 { 320 const struct ip *ip; 321 struct me_softc *sc; 322 323 if (V_me_hashtbl == NULL) 324 return (0); 325 326 MPASS(in_epoch(net_epoch_preempt)); 327 ip = mtod(m, const struct ip *); 328 CK_LIST_FOREACH(sc, &ME_HASH(ip->ip_dst.s_addr, 329 ip->ip_src.s_addr), chain) { 330 if (sc->me_src.s_addr == ip->ip_dst.s_addr && 331 sc->me_dst.s_addr == ip->ip_src.s_addr) { 332 if ((ME2IFP(sc)->if_flags & IFF_UP) == 0) 333 return (0); 334 *arg = sc; 335 return (ENCAP_DRV_LOOKUP); 336 } 337 } 338 return (0); 339 } 340 341 /* 342 * Check that ingress address belongs to local host. 343 */ 344 static void 345 me_set_running(struct me_softc *sc) 346 { 347 348 if (in_localip(sc->me_src)) 349 ME2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 350 else 351 ME2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 352 } 353 354 /* 355 * ifaddr_event handler. 356 * Clear IFF_DRV_RUNNING flag when ingress address disappears to prevent 357 * source address spoofing. 358 */ 359 static void 360 me_srcaddr(void *arg __unused, const struct sockaddr *sa, 361 int event __unused) 362 { 363 const struct sockaddr_in *sin; 364 struct me_softc *sc; 365 366 if (V_me_srchashtbl == NULL) 367 return; 368 369 MPASS(in_epoch(net_epoch_preempt)); 370 sin = (const struct sockaddr_in *)sa; 371 CK_LIST_FOREACH(sc, &ME_SRCHASH(sin->sin_addr.s_addr), srchash) { 372 if (sc->me_src.s_addr != sin->sin_addr.s_addr) 373 continue; 374 me_set_running(sc); 375 } 376 } 377 378 static int 379 me_set_tunnel(struct me_softc *sc, in_addr_t src, in_addr_t dst) 380 { 381 struct me_softc *tmp; 382 383 sx_assert(&me_ioctl_sx, SA_XLOCKED); 384 385 if (V_me_hashtbl == NULL) { 386 V_me_hashtbl = me_hashinit(); 387 V_me_srchashtbl = me_hashinit(); 388 } 389 390 if (sc->me_src.s_addr == src && sc->me_dst.s_addr == dst) 391 return (0); 392 393 CK_LIST_FOREACH(tmp, &ME_HASH(src, dst), chain) { 394 if (tmp == sc) 395 continue; 396 if (tmp->me_src.s_addr == src && 397 tmp->me_dst.s_addr == dst) 398 return (EADDRNOTAVAIL); 399 } 400 401 me_delete_tunnel(sc); 402 sc->me_dst.s_addr = dst; 403 sc->me_src.s_addr = src; 404 CK_LIST_INSERT_HEAD(&ME_HASH(src, dst), sc, chain); 405 CK_LIST_INSERT_HEAD(&ME_SRCHASH(src), sc, srchash); 406 407 me_set_running(sc); 408 if_link_state_change(ME2IFP(sc), LINK_STATE_UP); 409 return (0); 410 } 411 412 static void 413 me_delete_tunnel(struct me_softc *sc) 414 { 415 416 sx_assert(&me_ioctl_sx, SA_XLOCKED); 417 if (ME_READY(sc)) { 418 CK_LIST_REMOVE(sc, chain); 419 CK_LIST_REMOVE(sc, srchash); 420 ME_WAIT(); 421 422 sc->me_src.s_addr = 0; 423 sc->me_dst.s_addr = 0; 424 ME2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 425 if_link_state_change(ME2IFP(sc), LINK_STATE_DOWN); 426 } 427 } 428 429 static uint16_t 430 me_in_cksum(uint16_t *p, int nwords) 431 { 432 uint32_t sum = 0; 433 434 while (nwords-- > 0) 435 sum += *p++; 436 sum = (sum >> 16) + (sum & 0xffff); 437 sum += (sum >> 16); 438 return (~sum); 439 } 440 441 static int 442 me_input(struct mbuf *m, int off, int proto, void *arg) 443 { 444 struct me_softc *sc = arg; 445 struct mobhdr *mh; 446 struct ifnet *ifp; 447 struct ip *ip; 448 int hlen; 449 450 ifp = ME2IFP(sc); 451 /* checks for short packets */ 452 hlen = sizeof(struct mobhdr); 453 if (m->m_pkthdr.len < sizeof(struct ip) + hlen) 454 hlen -= sizeof(struct in_addr); 455 if (m->m_len < sizeof(struct ip) + hlen) 456 m = m_pullup(m, sizeof(struct ip) + hlen); 457 if (m == NULL) 458 goto drop; 459 mh = (struct mobhdr *)mtodo(m, sizeof(struct ip)); 460 /* check for wrong flags */ 461 if (mh->mob_flags & (~MOB_FLAGS_SP)) { 462 m_freem(m); 463 goto drop; 464 } 465 if (mh->mob_flags) { 466 if (hlen != sizeof(struct mobhdr)) { 467 m_freem(m); 468 goto drop; 469 } 470 } else 471 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 472 /* check mobile header checksum */ 473 if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) { 474 m_freem(m); 475 goto drop; 476 } 477 #ifdef MAC 478 mac_ifnet_create_mbuf(ifp, m); 479 #endif 480 ip = mtod(m, struct ip *); 481 ip->ip_dst = mh->mob_dst; 482 ip->ip_p = mh->mob_proto; 483 ip->ip_sum = 0; 484 ip->ip_len = htons(m->m_pkthdr.len - hlen); 485 if (mh->mob_flags) 486 ip->ip_src = mh->mob_src; 487 memmove(mtodo(m, hlen), ip, sizeof(struct ip)); 488 m_adj(m, hlen); 489 m_clrprotoflags(m); 490 m->m_pkthdr.rcvif = ifp; 491 m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 492 M_SETFIB(m, ifp->if_fib); 493 hlen = AF_INET; 494 BPF_MTAP2(ifp, &hlen, sizeof(hlen), m); 495 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 496 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 497 if ((ifp->if_flags & IFF_MONITOR) != 0) 498 m_freem(m); 499 else 500 netisr_dispatch(NETISR_IP, m); 501 return (IPPROTO_DONE); 502 drop: 503 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 504 return (IPPROTO_DONE); 505 } 506 507 static int 508 me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 509 struct route *ro __unused) 510 { 511 uint32_t af; 512 513 if (dst->sa_family == AF_UNSPEC) 514 bcopy(dst->sa_data, &af, sizeof(af)); 515 else 516 af = dst->sa_family; 517 m->m_pkthdr.csum_data = af; 518 return (ifp->if_transmit(ifp, m)); 519 } 520 521 #define MTAG_ME 1414491977 522 static int 523 me_transmit(struct ifnet *ifp, struct mbuf *m) 524 { 525 ME_RLOCK_TRACKER; 526 struct mobhdr mh; 527 struct me_softc *sc; 528 struct ip *ip; 529 uint32_t af; 530 int error, hlen, plen; 531 532 ME_RLOCK(); 533 #ifdef MAC 534 error = mac_ifnet_check_transmit(ifp, m); 535 if (error != 0) 536 goto drop; 537 #endif 538 error = ENETDOWN; 539 sc = ifp->if_softc; 540 if (sc == NULL || !ME_READY(sc) || 541 (ifp->if_flags & IFF_MONITOR) != 0 || 542 (ifp->if_flags & IFF_UP) == 0 || 543 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 544 (error = if_tunnel_check_nesting(ifp, m, MTAG_ME, 545 V_max_me_nesting)) != 0) { 546 m_freem(m); 547 goto drop; 548 } 549 af = m->m_pkthdr.csum_data; 550 if (af != AF_INET) { 551 error = EAFNOSUPPORT; 552 m_freem(m); 553 goto drop; 554 } 555 if (m->m_len < sizeof(struct ip)) 556 m = m_pullup(m, sizeof(struct ip)); 557 if (m == NULL) { 558 error = ENOBUFS; 559 goto drop; 560 } 561 ip = mtod(m, struct ip *); 562 /* Fragmented datagramms shouldn't be encapsulated */ 563 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 564 error = EINVAL; 565 m_freem(m); 566 goto drop; 567 } 568 mh.mob_proto = ip->ip_p; 569 mh.mob_src = ip->ip_src; 570 mh.mob_dst = ip->ip_dst; 571 if (in_hosteq(sc->me_src, ip->ip_src)) { 572 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 573 mh.mob_flags = 0; 574 } else { 575 hlen = sizeof(struct mobhdr); 576 mh.mob_flags = MOB_FLAGS_SP; 577 } 578 BPF_MTAP2(ifp, &af, sizeof(af), m); 579 plen = m->m_pkthdr.len; 580 ip->ip_src = sc->me_src; 581 ip->ip_dst = sc->me_dst; 582 m->m_flags &= ~(M_BCAST|M_MCAST); 583 M_SETFIB(m, sc->me_fibnum); 584 M_PREPEND(m, hlen, M_NOWAIT); 585 if (m == NULL) { 586 error = ENOBUFS; 587 goto drop; 588 } 589 if (m->m_len < sizeof(struct ip) + hlen) 590 m = m_pullup(m, sizeof(struct ip) + hlen); 591 if (m == NULL) { 592 error = ENOBUFS; 593 goto drop; 594 } 595 memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip)); 596 ip = mtod(m, struct ip *); 597 ip->ip_len = htons(m->m_pkthdr.len); 598 ip->ip_p = IPPROTO_MOBILE; 599 ip->ip_sum = 0; 600 mh.mob_csum = 0; 601 mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t)); 602 bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen); 603 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 604 drop: 605 if (error) 606 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 607 else { 608 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 609 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); 610 } 611 ME_RUNLOCK(); 612 return (error); 613 } 614 615 static void 616 me_qflush(struct ifnet *ifp __unused) 617 { 618 619 } 620 621 static const struct srcaddrtab *me_srcaddrtab = NULL; 622 static const struct encaptab *ecookie = NULL; 623 static const struct encap_config me_encap_cfg = { 624 .proto = IPPROTO_MOBILE, 625 .min_length = sizeof(struct ip) + sizeof(struct mobhdr) - 626 sizeof(in_addr_t), 627 .exact_match = ENCAP_DRV_LOOKUP, 628 .lookup = me_lookup, 629 .input = me_input 630 }; 631 632 static int 633 memodevent(module_t mod, int type, void *data) 634 { 635 636 switch (type) { 637 case MOD_LOAD: 638 me_srcaddrtab = ip_encap_register_srcaddr(me_srcaddr, 639 NULL, M_WAITOK); 640 ecookie = ip_encap_attach(&me_encap_cfg, NULL, M_WAITOK); 641 break; 642 case MOD_UNLOAD: 643 ip_encap_detach(ecookie); 644 ip_encap_unregister_srcaddr(me_srcaddrtab); 645 break; 646 default: 647 return (EOPNOTSUPP); 648 } 649 return (0); 650 } 651 652 static moduledata_t me_mod = { 653 "if_me", 654 memodevent, 655 0 656 }; 657 658 DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 659 MODULE_VERSION(if_me, 1); 660