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 { 164 165 V_me_cloner = if_clone_simple(mename, me_clone_create, 166 me_clone_destroy, 0); 167 } 168 VNET_SYSINIT(vnet_me_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 169 vnet_me_init, NULL); 170 171 static void 172 vnet_me_uninit(const void *unused __unused) 173 { 174 175 if (V_me_hashtbl != NULL) { 176 free(V_me_hashtbl, M_IFME); 177 V_me_hashtbl = NULL; 178 ME_WAIT(); 179 free(V_me_srchashtbl, M_IFME); 180 } 181 if_clone_detach(V_me_cloner); 182 } 183 VNET_SYSUNINIT(vnet_me_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 184 vnet_me_uninit, NULL); 185 186 static int 187 me_clone_create(struct if_clone *ifc, int unit, caddr_t params) 188 { 189 struct me_softc *sc; 190 191 sc = malloc(sizeof(struct me_softc), M_IFME, M_WAITOK | M_ZERO); 192 sc->me_fibnum = curthread->td_proc->p_fibnum; 193 ME2IFP(sc) = if_alloc(IFT_TUNNEL); 194 ME2IFP(sc)->if_softc = sc; 195 if_initname(ME2IFP(sc), mename, unit); 196 197 ME2IFP(sc)->if_mtu = MEMTU;; 198 ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 199 ME2IFP(sc)->if_output = me_output; 200 ME2IFP(sc)->if_ioctl = me_ioctl; 201 ME2IFP(sc)->if_transmit = me_transmit; 202 ME2IFP(sc)->if_qflush = me_qflush; 203 ME2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE; 204 ME2IFP(sc)->if_capenable |= IFCAP_LINKSTATE; 205 if_attach(ME2IFP(sc)); 206 bpfattach(ME2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 207 return (0); 208 } 209 210 static void 211 me_clone_destroy(struct ifnet *ifp) 212 { 213 struct me_softc *sc; 214 215 sx_xlock(&me_ioctl_sx); 216 sc = ifp->if_softc; 217 me_delete_tunnel(sc); 218 bpfdetach(ifp); 219 if_detach(ifp); 220 ifp->if_softc = NULL; 221 sx_xunlock(&me_ioctl_sx); 222 223 ME_WAIT(); 224 if_free(ifp); 225 free(sc, M_IFME); 226 } 227 228 static int 229 me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 230 { 231 struct ifreq *ifr = (struct ifreq *)data; 232 struct sockaddr_in *src, *dst; 233 struct me_softc *sc; 234 int error; 235 236 switch (cmd) { 237 case SIOCSIFMTU: 238 if (ifr->ifr_mtu < 576) 239 return (EINVAL); 240 ifp->if_mtu = ifr->ifr_mtu; 241 return (0); 242 case SIOCSIFADDR: 243 ifp->if_flags |= IFF_UP; 244 case SIOCSIFFLAGS: 245 case SIOCADDMULTI: 246 case SIOCDELMULTI: 247 return (0); 248 } 249 sx_xlock(&me_ioctl_sx); 250 sc = ifp->if_softc; 251 if (sc == NULL) { 252 error = ENXIO; 253 goto end; 254 } 255 error = 0; 256 switch (cmd) { 257 case SIOCSIFPHYADDR: 258 src = &((struct in_aliasreq *)data)->ifra_addr; 259 dst = &((struct in_aliasreq *)data)->ifra_dstaddr; 260 if (src->sin_family != dst->sin_family || 261 src->sin_family != AF_INET || 262 src->sin_len != dst->sin_len || 263 src->sin_len != sizeof(struct sockaddr_in)) { 264 error = EINVAL; 265 break; 266 } 267 if (src->sin_addr.s_addr == INADDR_ANY || 268 dst->sin_addr.s_addr == INADDR_ANY) { 269 error = EADDRNOTAVAIL; 270 break; 271 } 272 error = me_set_tunnel(sc, src->sin_addr.s_addr, 273 dst->sin_addr.s_addr); 274 break; 275 case SIOCDIFPHYADDR: 276 me_delete_tunnel(sc); 277 break; 278 case SIOCGIFPSRCADDR: 279 case SIOCGIFPDSTADDR: 280 if (!ME_READY(sc)) { 281 error = EADDRNOTAVAIL; 282 break; 283 } 284 src = (struct sockaddr_in *)&ifr->ifr_addr; 285 memset(src, 0, sizeof(*src)); 286 src->sin_family = AF_INET; 287 src->sin_len = sizeof(*src); 288 switch (cmd) { 289 case SIOCGIFPSRCADDR: 290 src->sin_addr = sc->me_src; 291 break; 292 case SIOCGIFPDSTADDR: 293 src->sin_addr = sc->me_dst; 294 break; 295 } 296 error = prison_if(curthread->td_ucred, sintosa(src)); 297 if (error != 0) 298 memset(src, 0, sizeof(*src)); 299 break; 300 case SIOCGTUNFIB: 301 ifr->ifr_fib = sc->me_fibnum; 302 break; 303 case SIOCSTUNFIB: 304 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 305 break; 306 if (ifr->ifr_fib >= rt_numfibs) 307 error = EINVAL; 308 else 309 sc->me_fibnum = ifr->ifr_fib; 310 break; 311 default: 312 error = EINVAL; 313 break; 314 } 315 end: 316 sx_xunlock(&me_ioctl_sx); 317 return (error); 318 } 319 320 static int 321 me_lookup(const struct mbuf *m, int off, int proto, void **arg) 322 { 323 const struct ip *ip; 324 struct me_softc *sc; 325 326 if (V_me_hashtbl == NULL) 327 return (0); 328 329 MPASS(in_epoch(net_epoch_preempt)); 330 ip = mtod(m, const struct ip *); 331 CK_LIST_FOREACH(sc, &ME_HASH(ip->ip_dst.s_addr, 332 ip->ip_src.s_addr), chain) { 333 if (sc->me_src.s_addr == ip->ip_dst.s_addr && 334 sc->me_dst.s_addr == ip->ip_src.s_addr) { 335 if ((ME2IFP(sc)->if_flags & IFF_UP) == 0) 336 return (0); 337 *arg = sc; 338 return (ENCAP_DRV_LOOKUP); 339 } 340 } 341 return (0); 342 } 343 344 /* 345 * Check that ingress address belongs to local host. 346 */ 347 static void 348 me_set_running(struct me_softc *sc) 349 { 350 351 if (in_localip(sc->me_src)) 352 ME2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 353 else 354 ME2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 355 } 356 357 /* 358 * ifaddr_event handler. 359 * Clear IFF_DRV_RUNNING flag when ingress address disappears to prevent 360 * source address spoofing. 361 */ 362 static void 363 me_srcaddr(void *arg __unused, const struct sockaddr *sa, 364 int event __unused) 365 { 366 const struct sockaddr_in *sin; 367 struct me_softc *sc; 368 369 /* Check that VNET is ready */ 370 if (V_me_hashtbl == NULL) 371 return; 372 373 MPASS(in_epoch(net_epoch_preempt)); 374 sin = (const struct sockaddr_in *)sa; 375 CK_LIST_FOREACH(sc, &ME_SRCHASH(sin->sin_addr.s_addr), srchash) { 376 if (sc->me_src.s_addr != sin->sin_addr.s_addr) 377 continue; 378 me_set_running(sc); 379 } 380 } 381 382 static int 383 me_set_tunnel(struct me_softc *sc, in_addr_t src, in_addr_t dst) 384 { 385 struct me_softc *tmp; 386 387 sx_assert(&me_ioctl_sx, SA_XLOCKED); 388 389 if (V_me_hashtbl == NULL) { 390 V_me_hashtbl = me_hashinit(); 391 V_me_srchashtbl = me_hashinit(); 392 } 393 394 if (sc->me_src.s_addr == src && sc->me_dst.s_addr == dst) 395 return (0); 396 397 CK_LIST_FOREACH(tmp, &ME_HASH(src, dst), chain) { 398 if (tmp == sc) 399 continue; 400 if (tmp->me_src.s_addr == src && 401 tmp->me_dst.s_addr == dst) 402 return (EADDRNOTAVAIL); 403 } 404 405 me_delete_tunnel(sc); 406 sc->me_dst.s_addr = dst; 407 sc->me_src.s_addr = src; 408 CK_LIST_INSERT_HEAD(&ME_HASH(src, dst), sc, chain); 409 CK_LIST_INSERT_HEAD(&ME_SRCHASH(src), sc, srchash); 410 411 me_set_running(sc); 412 if_link_state_change(ME2IFP(sc), LINK_STATE_UP); 413 return (0); 414 } 415 416 static void 417 me_delete_tunnel(struct me_softc *sc) 418 { 419 420 sx_assert(&me_ioctl_sx, SA_XLOCKED); 421 if (ME_READY(sc)) { 422 CK_LIST_REMOVE(sc, chain); 423 CK_LIST_REMOVE(sc, srchash); 424 ME_WAIT(); 425 426 sc->me_src.s_addr = 0; 427 sc->me_dst.s_addr = 0; 428 ME2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 429 if_link_state_change(ME2IFP(sc), LINK_STATE_DOWN); 430 } 431 } 432 433 static uint16_t 434 me_in_cksum(uint16_t *p, int nwords) 435 { 436 uint32_t sum = 0; 437 438 while (nwords-- > 0) 439 sum += *p++; 440 sum = (sum >> 16) + (sum & 0xffff); 441 sum += (sum >> 16); 442 return (~sum); 443 } 444 445 static int 446 me_input(struct mbuf *m, int off, int proto, void *arg) 447 { 448 struct me_softc *sc = arg; 449 struct mobhdr *mh; 450 struct ifnet *ifp; 451 struct ip *ip; 452 int hlen; 453 454 ifp = ME2IFP(sc); 455 /* checks for short packets */ 456 hlen = sizeof(struct mobhdr); 457 if (m->m_pkthdr.len < sizeof(struct ip) + hlen) 458 hlen -= sizeof(struct in_addr); 459 if (m->m_len < sizeof(struct ip) + hlen) 460 m = m_pullup(m, sizeof(struct ip) + hlen); 461 if (m == NULL) 462 goto drop; 463 mh = (struct mobhdr *)mtodo(m, sizeof(struct ip)); 464 /* check for wrong flags */ 465 if (mh->mob_flags & (~MOB_FLAGS_SP)) { 466 m_freem(m); 467 goto drop; 468 } 469 if (mh->mob_flags) { 470 if (hlen != sizeof(struct mobhdr)) { 471 m_freem(m); 472 goto drop; 473 } 474 } else 475 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 476 /* check mobile header checksum */ 477 if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) { 478 m_freem(m); 479 goto drop; 480 } 481 #ifdef MAC 482 mac_ifnet_create_mbuf(ifp, m); 483 #endif 484 ip = mtod(m, struct ip *); 485 ip->ip_dst = mh->mob_dst; 486 ip->ip_p = mh->mob_proto; 487 ip->ip_sum = 0; 488 ip->ip_len = htons(m->m_pkthdr.len - hlen); 489 if (mh->mob_flags) 490 ip->ip_src = mh->mob_src; 491 memmove(mtodo(m, hlen), ip, sizeof(struct ip)); 492 m_adj(m, hlen); 493 m_clrprotoflags(m); 494 m->m_pkthdr.rcvif = ifp; 495 m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 496 M_SETFIB(m, ifp->if_fib); 497 hlen = AF_INET; 498 BPF_MTAP2(ifp, &hlen, sizeof(hlen), m); 499 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 500 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 501 if ((ifp->if_flags & IFF_MONITOR) != 0) 502 m_freem(m); 503 else 504 netisr_dispatch(NETISR_IP, m); 505 return (IPPROTO_DONE); 506 drop: 507 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 508 return (IPPROTO_DONE); 509 } 510 511 static int 512 me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 513 struct route *ro __unused) 514 { 515 uint32_t af; 516 517 if (dst->sa_family == AF_UNSPEC) 518 bcopy(dst->sa_data, &af, sizeof(af)); 519 else 520 af = dst->sa_family; 521 m->m_pkthdr.csum_data = af; 522 return (ifp->if_transmit(ifp, m)); 523 } 524 525 #define MTAG_ME 1414491977 526 static int 527 me_transmit(struct ifnet *ifp, struct mbuf *m) 528 { 529 ME_RLOCK_TRACKER; 530 struct mobhdr mh; 531 struct me_softc *sc; 532 struct ip *ip; 533 uint32_t af; 534 int error, hlen, plen; 535 536 ME_RLOCK(); 537 #ifdef MAC 538 error = mac_ifnet_check_transmit(ifp, m); 539 if (error != 0) 540 goto drop; 541 #endif 542 error = ENETDOWN; 543 sc = ifp->if_softc; 544 if (sc == NULL || !ME_READY(sc) || 545 (ifp->if_flags & IFF_MONITOR) != 0 || 546 (ifp->if_flags & IFF_UP) == 0 || 547 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 548 (error = if_tunnel_check_nesting(ifp, m, MTAG_ME, 549 V_max_me_nesting)) != 0) { 550 m_freem(m); 551 goto drop; 552 } 553 af = m->m_pkthdr.csum_data; 554 if (af != AF_INET) { 555 error = EAFNOSUPPORT; 556 m_freem(m); 557 goto drop; 558 } 559 if (m->m_len < sizeof(struct ip)) 560 m = m_pullup(m, sizeof(struct ip)); 561 if (m == NULL) { 562 error = ENOBUFS; 563 goto drop; 564 } 565 ip = mtod(m, struct ip *); 566 /* Fragmented datagramms shouldn't be encapsulated */ 567 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 568 error = EINVAL; 569 m_freem(m); 570 goto drop; 571 } 572 mh.mob_proto = ip->ip_p; 573 mh.mob_src = ip->ip_src; 574 mh.mob_dst = ip->ip_dst; 575 if (in_hosteq(sc->me_src, ip->ip_src)) { 576 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 577 mh.mob_flags = 0; 578 } else { 579 hlen = sizeof(struct mobhdr); 580 mh.mob_flags = MOB_FLAGS_SP; 581 } 582 BPF_MTAP2(ifp, &af, sizeof(af), m); 583 plen = m->m_pkthdr.len; 584 ip->ip_src = sc->me_src; 585 ip->ip_dst = sc->me_dst; 586 m->m_flags &= ~(M_BCAST|M_MCAST); 587 M_SETFIB(m, sc->me_fibnum); 588 M_PREPEND(m, hlen, M_NOWAIT); 589 if (m == NULL) { 590 error = ENOBUFS; 591 goto drop; 592 } 593 if (m->m_len < sizeof(struct ip) + hlen) 594 m = m_pullup(m, sizeof(struct ip) + hlen); 595 if (m == NULL) { 596 error = ENOBUFS; 597 goto drop; 598 } 599 memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip)); 600 ip = mtod(m, struct ip *); 601 ip->ip_len = htons(m->m_pkthdr.len); 602 ip->ip_p = IPPROTO_MOBILE; 603 ip->ip_sum = 0; 604 mh.mob_csum = 0; 605 mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t)); 606 bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen); 607 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 608 drop: 609 if (error) 610 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 611 else { 612 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 613 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); 614 } 615 ME_RUNLOCK(); 616 return (error); 617 } 618 619 static void 620 me_qflush(struct ifnet *ifp __unused) 621 { 622 623 } 624 625 static const struct srcaddrtab *me_srcaddrtab = NULL; 626 static const struct encaptab *ecookie = NULL; 627 static const struct encap_config me_encap_cfg = { 628 .proto = IPPROTO_MOBILE, 629 .min_length = sizeof(struct ip) + sizeof(struct mobhdr) - 630 sizeof(in_addr_t), 631 .exact_match = ENCAP_DRV_LOOKUP, 632 .lookup = me_lookup, 633 .input = me_input 634 }; 635 636 static int 637 memodevent(module_t mod, int type, void *data) 638 { 639 640 switch (type) { 641 case MOD_LOAD: 642 me_srcaddrtab = ip_encap_register_srcaddr(me_srcaddr, 643 NULL, M_WAITOK); 644 ecookie = ip_encap_attach(&me_encap_cfg, NULL, M_WAITOK); 645 break; 646 case MOD_UNLOAD: 647 ip_encap_detach(ecookie); 648 ip_encap_unregister_srcaddr(me_srcaddrtab); 649 break; 650 default: 651 return (EOPNOTSUPP); 652 } 653 return (0); 654 } 655 656 static moduledata_t me_mod = { 657 "if_me", 658 memodevent, 659 0 660 }; 661 662 DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 663 MODULE_VERSION(if_me, 1); 664