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 #ifdef VIMAGE 117 static void me_reassign(struct ifnet *, struct vnet *, char *); 118 #endif 119 static void me_qflush(struct ifnet *); 120 static int me_transmit(struct ifnet *, struct mbuf *); 121 static int me_ioctl(struct ifnet *, u_long, caddr_t); 122 static int me_output(struct ifnet *, struct mbuf *, 123 const struct sockaddr *, struct route *); 124 static int me_input(struct mbuf *, int, int, void *); 125 126 static int me_set_tunnel(struct me_softc *, in_addr_t, in_addr_t); 127 static void me_delete_tunnel(struct me_softc *); 128 129 SYSCTL_DECL(_net_link); 130 static SYSCTL_NODE(_net_link, IFT_TUNNEL, me, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 131 "Minimal Encapsulation for IP (RFC 2004)"); 132 #ifndef MAX_ME_NEST 133 #define MAX_ME_NEST 1 134 #endif 135 136 VNET_DEFINE_STATIC(int, max_me_nesting) = MAX_ME_NEST; 137 #define V_max_me_nesting VNET(max_me_nesting) 138 SYSCTL_INT(_net_link_me, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET, 139 &VNET_NAME(max_me_nesting), 0, "Max nested tunnels"); 140 141 static uint32_t 142 me_hashval(in_addr_t src, in_addr_t dst) 143 { 144 uint32_t ret; 145 146 ret = fnv_32_buf(&src, sizeof(src), FNV1_32_INIT); 147 return (fnv_32_buf(&dst, sizeof(dst), ret)); 148 } 149 150 static struct me_list * 151 me_hashinit(void) 152 { 153 struct me_list *hash; 154 int i; 155 156 hash = malloc(sizeof(struct me_list) * ME_HASH_SIZE, 157 M_IFME, M_WAITOK); 158 for (i = 0; i < ME_HASH_SIZE; i++) 159 CK_LIST_INIT(&hash[i]); 160 161 return (hash); 162 } 163 164 static void 165 vnet_me_init(const void *unused __unused) 166 { 167 168 V_me_cloner = if_clone_simple(mename, me_clone_create, 169 me_clone_destroy, 0); 170 } 171 VNET_SYSINIT(vnet_me_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 172 vnet_me_init, NULL); 173 174 static void 175 vnet_me_uninit(const void *unused __unused) 176 { 177 178 if (V_me_hashtbl != NULL) { 179 free(V_me_hashtbl, M_IFME); 180 V_me_hashtbl = NULL; 181 ME_WAIT(); 182 free(V_me_srchashtbl, M_IFME); 183 } 184 if_clone_detach(V_me_cloner); 185 } 186 VNET_SYSUNINIT(vnet_me_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 187 vnet_me_uninit, NULL); 188 189 static int 190 me_clone_create(struct if_clone *ifc, int unit, caddr_t params) 191 { 192 struct me_softc *sc; 193 194 sc = malloc(sizeof(struct me_softc), M_IFME, M_WAITOK | M_ZERO); 195 sc->me_fibnum = curthread->td_proc->p_fibnum; 196 ME2IFP(sc) = if_alloc(IFT_TUNNEL); 197 ME2IFP(sc)->if_softc = sc; 198 if_initname(ME2IFP(sc), mename, unit); 199 200 ME2IFP(sc)->if_mtu = MEMTU; 201 ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 202 ME2IFP(sc)->if_output = me_output; 203 ME2IFP(sc)->if_ioctl = me_ioctl; 204 ME2IFP(sc)->if_transmit = me_transmit; 205 ME2IFP(sc)->if_qflush = me_qflush; 206 #ifdef VIMAGE 207 ME2IFP(sc)->if_reassign = me_reassign; 208 #endif 209 ME2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE; 210 ME2IFP(sc)->if_capenable |= IFCAP_LINKSTATE; 211 if_attach(ME2IFP(sc)); 212 bpfattach(ME2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 213 return (0); 214 } 215 216 #ifdef VIMAGE 217 static void 218 me_reassign(struct ifnet *ifp, struct vnet *new_vnet __unused, 219 char *unused __unused) 220 { 221 struct me_softc *sc; 222 223 sx_xlock(&me_ioctl_sx); 224 sc = ifp->if_softc; 225 if (sc != NULL) 226 me_delete_tunnel(sc); 227 sx_xunlock(&me_ioctl_sx); 228 } 229 #endif /* VIMAGE */ 230 231 static void 232 me_clone_destroy(struct ifnet *ifp) 233 { 234 struct me_softc *sc; 235 236 sx_xlock(&me_ioctl_sx); 237 sc = ifp->if_softc; 238 me_delete_tunnel(sc); 239 bpfdetach(ifp); 240 if_detach(ifp); 241 ifp->if_softc = NULL; 242 sx_xunlock(&me_ioctl_sx); 243 244 ME_WAIT(); 245 if_free(ifp); 246 free(sc, M_IFME); 247 } 248 249 static int 250 me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 251 { 252 struct ifreq *ifr = (struct ifreq *)data; 253 struct sockaddr_in *src, *dst; 254 struct me_softc *sc; 255 int error; 256 257 switch (cmd) { 258 case SIOCSIFMTU: 259 if (ifr->ifr_mtu < 576) 260 return (EINVAL); 261 ifp->if_mtu = ifr->ifr_mtu; 262 return (0); 263 case SIOCSIFADDR: 264 ifp->if_flags |= IFF_UP; 265 case SIOCSIFFLAGS: 266 case SIOCADDMULTI: 267 case SIOCDELMULTI: 268 return (0); 269 } 270 sx_xlock(&me_ioctl_sx); 271 sc = ifp->if_softc; 272 if (sc == NULL) { 273 error = ENXIO; 274 goto end; 275 } 276 error = 0; 277 switch (cmd) { 278 case SIOCSIFPHYADDR: 279 src = &((struct in_aliasreq *)data)->ifra_addr; 280 dst = &((struct in_aliasreq *)data)->ifra_dstaddr; 281 if (src->sin_family != dst->sin_family || 282 src->sin_family != AF_INET || 283 src->sin_len != dst->sin_len || 284 src->sin_len != sizeof(struct sockaddr_in)) { 285 error = EINVAL; 286 break; 287 } 288 if (src->sin_addr.s_addr == INADDR_ANY || 289 dst->sin_addr.s_addr == INADDR_ANY) { 290 error = EADDRNOTAVAIL; 291 break; 292 } 293 error = me_set_tunnel(sc, src->sin_addr.s_addr, 294 dst->sin_addr.s_addr); 295 break; 296 case SIOCDIFPHYADDR: 297 me_delete_tunnel(sc); 298 break; 299 case SIOCGIFPSRCADDR: 300 case SIOCGIFPDSTADDR: 301 if (!ME_READY(sc)) { 302 error = EADDRNOTAVAIL; 303 break; 304 } 305 src = (struct sockaddr_in *)&ifr->ifr_addr; 306 memset(src, 0, sizeof(*src)); 307 src->sin_family = AF_INET; 308 src->sin_len = sizeof(*src); 309 switch (cmd) { 310 case SIOCGIFPSRCADDR: 311 src->sin_addr = sc->me_src; 312 break; 313 case SIOCGIFPDSTADDR: 314 src->sin_addr = sc->me_dst; 315 break; 316 } 317 error = prison_if(curthread->td_ucred, sintosa(src)); 318 if (error != 0) 319 memset(src, 0, sizeof(*src)); 320 break; 321 case SIOCGTUNFIB: 322 ifr->ifr_fib = sc->me_fibnum; 323 break; 324 case SIOCSTUNFIB: 325 if ((error = priv_check(curthread, PRIV_NET_ME)) != 0) 326 break; 327 if (ifr->ifr_fib >= rt_numfibs) 328 error = EINVAL; 329 else 330 sc->me_fibnum = ifr->ifr_fib; 331 break; 332 default: 333 error = EINVAL; 334 break; 335 } 336 end: 337 sx_xunlock(&me_ioctl_sx); 338 return (error); 339 } 340 341 static int 342 me_lookup(const struct mbuf *m, int off, int proto, void **arg) 343 { 344 const struct ip *ip; 345 struct me_softc *sc; 346 347 if (V_me_hashtbl == NULL) 348 return (0); 349 350 NET_EPOCH_ASSERT(); 351 ip = mtod(m, const struct ip *); 352 CK_LIST_FOREACH(sc, &ME_HASH(ip->ip_dst.s_addr, 353 ip->ip_src.s_addr), chain) { 354 if (sc->me_src.s_addr == ip->ip_dst.s_addr && 355 sc->me_dst.s_addr == ip->ip_src.s_addr) { 356 if ((ME2IFP(sc)->if_flags & IFF_UP) == 0) 357 return (0); 358 *arg = sc; 359 return (ENCAP_DRV_LOOKUP); 360 } 361 } 362 return (0); 363 } 364 365 /* 366 * Check that ingress address belongs to local host. 367 */ 368 static void 369 me_set_running(struct me_softc *sc) 370 { 371 372 if (in_localip(sc->me_src)) 373 ME2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING; 374 else 375 ME2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 376 } 377 378 /* 379 * ifaddr_event handler. 380 * Clear IFF_DRV_RUNNING flag when ingress address disappears to prevent 381 * source address spoofing. 382 */ 383 static void 384 me_srcaddr(void *arg __unused, const struct sockaddr *sa, 385 int event __unused) 386 { 387 const struct sockaddr_in *sin; 388 struct me_softc *sc; 389 390 /* Check that VNET is ready */ 391 if (V_me_hashtbl == NULL) 392 return; 393 394 NET_EPOCH_ASSERT(); 395 sin = (const struct sockaddr_in *)sa; 396 CK_LIST_FOREACH(sc, &ME_SRCHASH(sin->sin_addr.s_addr), srchash) { 397 if (sc->me_src.s_addr != sin->sin_addr.s_addr) 398 continue; 399 me_set_running(sc); 400 } 401 } 402 403 static int 404 me_set_tunnel(struct me_softc *sc, in_addr_t src, in_addr_t dst) 405 { 406 struct epoch_tracker et; 407 struct me_softc *tmp; 408 409 sx_assert(&me_ioctl_sx, SA_XLOCKED); 410 411 if (V_me_hashtbl == NULL) { 412 V_me_hashtbl = me_hashinit(); 413 V_me_srchashtbl = me_hashinit(); 414 } 415 416 if (sc->me_src.s_addr == src && sc->me_dst.s_addr == dst) 417 return (0); 418 419 CK_LIST_FOREACH(tmp, &ME_HASH(src, dst), chain) { 420 if (tmp == sc) 421 continue; 422 if (tmp->me_src.s_addr == src && 423 tmp->me_dst.s_addr == dst) 424 return (EADDRNOTAVAIL); 425 } 426 427 me_delete_tunnel(sc); 428 sc->me_dst.s_addr = dst; 429 sc->me_src.s_addr = src; 430 CK_LIST_INSERT_HEAD(&ME_HASH(src, dst), sc, chain); 431 CK_LIST_INSERT_HEAD(&ME_SRCHASH(src), sc, srchash); 432 433 NET_EPOCH_ENTER(et); 434 me_set_running(sc); 435 NET_EPOCH_EXIT(et); 436 if_link_state_change(ME2IFP(sc), LINK_STATE_UP); 437 return (0); 438 } 439 440 static void 441 me_delete_tunnel(struct me_softc *sc) 442 { 443 444 sx_assert(&me_ioctl_sx, SA_XLOCKED); 445 if (ME_READY(sc)) { 446 CK_LIST_REMOVE(sc, chain); 447 CK_LIST_REMOVE(sc, srchash); 448 ME_WAIT(); 449 450 sc->me_src.s_addr = 0; 451 sc->me_dst.s_addr = 0; 452 ME2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING; 453 if_link_state_change(ME2IFP(sc), LINK_STATE_DOWN); 454 } 455 } 456 457 static uint16_t 458 me_in_cksum(uint16_t *p, int nwords) 459 { 460 uint32_t sum = 0; 461 462 while (nwords-- > 0) 463 sum += *p++; 464 sum = (sum >> 16) + (sum & 0xffff); 465 sum += (sum >> 16); 466 return (~sum); 467 } 468 469 static int 470 me_input(struct mbuf *m, int off, int proto, void *arg) 471 { 472 struct me_softc *sc = arg; 473 struct mobhdr *mh; 474 struct ifnet *ifp; 475 struct ip *ip; 476 int hlen; 477 478 NET_EPOCH_ASSERT(); 479 480 ifp = ME2IFP(sc); 481 /* checks for short packets */ 482 hlen = sizeof(struct mobhdr); 483 if (m->m_pkthdr.len < sizeof(struct ip) + hlen) 484 hlen -= sizeof(struct in_addr); 485 if (m->m_len < sizeof(struct ip) + hlen) 486 m = m_pullup(m, sizeof(struct ip) + hlen); 487 if (m == NULL) 488 goto drop; 489 mh = (struct mobhdr *)mtodo(m, sizeof(struct ip)); 490 /* check for wrong flags */ 491 if (mh->mob_flags & (~MOB_FLAGS_SP)) { 492 m_freem(m); 493 goto drop; 494 } 495 if (mh->mob_flags) { 496 if (hlen != sizeof(struct mobhdr)) { 497 m_freem(m); 498 goto drop; 499 } 500 } else 501 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 502 /* check mobile header checksum */ 503 if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) { 504 m_freem(m); 505 goto drop; 506 } 507 #ifdef MAC 508 mac_ifnet_create_mbuf(ifp, m); 509 #endif 510 ip = mtod(m, struct ip *); 511 ip->ip_dst = mh->mob_dst; 512 ip->ip_p = mh->mob_proto; 513 ip->ip_sum = 0; 514 ip->ip_len = htons(m->m_pkthdr.len - hlen); 515 if (mh->mob_flags) 516 ip->ip_src = mh->mob_src; 517 memmove(mtodo(m, hlen), ip, sizeof(struct ip)); 518 m_adj(m, hlen); 519 m_clrprotoflags(m); 520 m->m_pkthdr.rcvif = ifp; 521 m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 522 M_SETFIB(m, ifp->if_fib); 523 hlen = AF_INET; 524 BPF_MTAP2(ifp, &hlen, sizeof(hlen), m); 525 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 526 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 527 if ((ifp->if_flags & IFF_MONITOR) != 0) 528 m_freem(m); 529 else 530 netisr_dispatch(NETISR_IP, m); 531 return (IPPROTO_DONE); 532 drop: 533 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 534 return (IPPROTO_DONE); 535 } 536 537 static int 538 me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 539 struct route *ro) 540 { 541 uint32_t af; 542 543 if (dst->sa_family == AF_UNSPEC) 544 bcopy(dst->sa_data, &af, sizeof(af)); 545 else 546 af = RO_GET_FAMILY(ro, dst); 547 m->m_pkthdr.csum_data = af; 548 return (ifp->if_transmit(ifp, m)); 549 } 550 551 #define MTAG_ME 1414491977 552 static int 553 me_transmit(struct ifnet *ifp, struct mbuf *m) 554 { 555 ME_RLOCK_TRACKER; 556 struct mobhdr mh; 557 struct me_softc *sc; 558 struct ip *ip; 559 uint32_t af; 560 int error, hlen, plen; 561 562 ME_RLOCK(); 563 #ifdef MAC 564 error = mac_ifnet_check_transmit(ifp, m); 565 if (error != 0) 566 goto drop; 567 #endif 568 error = ENETDOWN; 569 sc = ifp->if_softc; 570 if (sc == NULL || !ME_READY(sc) || 571 (ifp->if_flags & IFF_MONITOR) != 0 || 572 (ifp->if_flags & IFF_UP) == 0 || 573 (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || 574 (error = if_tunnel_check_nesting(ifp, m, MTAG_ME, 575 V_max_me_nesting)) != 0) { 576 m_freem(m); 577 goto drop; 578 } 579 af = m->m_pkthdr.csum_data; 580 if (af != AF_INET) { 581 error = EAFNOSUPPORT; 582 m_freem(m); 583 goto drop; 584 } 585 if (m->m_len < sizeof(struct ip)) 586 m = m_pullup(m, sizeof(struct ip)); 587 if (m == NULL) { 588 error = ENOBUFS; 589 goto drop; 590 } 591 ip = mtod(m, struct ip *); 592 /* Fragmented datagramms shouldn't be encapsulated */ 593 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 594 error = EINVAL; 595 m_freem(m); 596 goto drop; 597 } 598 mh.mob_proto = ip->ip_p; 599 mh.mob_src = ip->ip_src; 600 mh.mob_dst = ip->ip_dst; 601 if (in_hosteq(sc->me_src, ip->ip_src)) { 602 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 603 mh.mob_flags = 0; 604 } else { 605 hlen = sizeof(struct mobhdr); 606 mh.mob_flags = MOB_FLAGS_SP; 607 } 608 BPF_MTAP2(ifp, &af, sizeof(af), m); 609 plen = m->m_pkthdr.len; 610 ip->ip_src = sc->me_src; 611 ip->ip_dst = sc->me_dst; 612 m->m_flags &= ~(M_BCAST|M_MCAST); 613 M_SETFIB(m, sc->me_fibnum); 614 M_PREPEND(m, hlen, M_NOWAIT); 615 if (m == NULL) { 616 error = ENOBUFS; 617 goto drop; 618 } 619 if (m->m_len < sizeof(struct ip) + hlen) 620 m = m_pullup(m, sizeof(struct ip) + hlen); 621 if (m == NULL) { 622 error = ENOBUFS; 623 goto drop; 624 } 625 memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip)); 626 ip = mtod(m, struct ip *); 627 ip->ip_len = htons(m->m_pkthdr.len); 628 ip->ip_p = IPPROTO_MOBILE; 629 ip->ip_sum = 0; 630 mh.mob_csum = 0; 631 mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t)); 632 bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen); 633 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 634 drop: 635 if (error) 636 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 637 else { 638 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 639 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); 640 } 641 ME_RUNLOCK(); 642 return (error); 643 } 644 645 static void 646 me_qflush(struct ifnet *ifp __unused) 647 { 648 649 } 650 651 static const struct srcaddrtab *me_srcaddrtab = NULL; 652 static const struct encaptab *ecookie = NULL; 653 static const struct encap_config me_encap_cfg = { 654 .proto = IPPROTO_MOBILE, 655 .min_length = sizeof(struct ip) + sizeof(struct mobhdr) - 656 sizeof(in_addr_t), 657 .exact_match = ENCAP_DRV_LOOKUP, 658 .lookup = me_lookup, 659 .input = me_input 660 }; 661 662 static int 663 memodevent(module_t mod, int type, void *data) 664 { 665 666 switch (type) { 667 case MOD_LOAD: 668 me_srcaddrtab = ip_encap_register_srcaddr(me_srcaddr, 669 NULL, M_WAITOK); 670 ecookie = ip_encap_attach(&me_encap_cfg, NULL, M_WAITOK); 671 break; 672 case MOD_UNLOAD: 673 ip_encap_detach(ecookie); 674 ip_encap_unregister_srcaddr(me_srcaddrtab); 675 break; 676 default: 677 return (EOPNOTSUPP); 678 } 679 return (0); 680 } 681 682 static moduledata_t me_mod = { 683 "if_me", 684 memodevent, 685 0 686 }; 687 688 DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 689 MODULE_VERSION(if_me, 1); 690