if_me.c revision 282809
1/*- 2 * Copyright (c) 2014 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: head/sys/net/if_me.c 282809 2015-05-12 07:37:27Z ae $"); 29 30#include <sys/param.h> 31#include <sys/jail.h> 32#include <sys/kernel.h> 33#include <sys/lock.h> 34#include <sys/libkern.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/protosw.h> 41#include <sys/rmlock.h> 42#include <sys/socket.h> 43#include <sys/sockio.h> 44#include <sys/sx.h> 45#include <sys/sysctl.h> 46#include <sys/syslog.h> 47#include <sys/systm.h> 48 49#include <net/bpf.h> 50#include <net/ethernet.h> 51#include <net/if.h> 52#include <net/if_var.h> 53#include <net/if_clone.h> 54#include <net/if_types.h> 55#include <net/netisr.h> 56#include <net/vnet.h> 57#include <net/route.h> 58 59#include <netinet/in.h> 60#include <netinet/in_systm.h> 61#include <netinet/in_var.h> 62#include <netinet/ip.h> 63#include <netinet/ip_var.h> 64#include <netinet/ip_encap.h> 65 66#include <machine/in_cksum.h> 67#include <security/mac/mac_framework.h> 68 69#define MEMTU 1500 70static const char mename[] = "me"; 71static MALLOC_DEFINE(M_IFME, mename, "Minimal Encapsulation for IP"); 72static VNET_DEFINE(struct mtx, me_mtx); 73#define V_me_mtx VNET(me_mtx) 74/* Minimal forwarding header RFC 2004 */ 75struct mobhdr { 76 uint8_t mob_proto; /* protocol */ 77 uint8_t mob_flags; /* flags */ 78#define MOB_FLAGS_SP 0x80 /* source present */ 79 uint16_t mob_csum; /* header checksum */ 80 struct in_addr mob_dst; /* original destination address */ 81 struct in_addr mob_src; /* original source addr (optional) */ 82} __packed; 83 84struct me_softc { 85 struct ifnet *me_ifp; 86 LIST_ENTRY(me_softc) me_list; 87 struct rmlock me_lock; 88 u_int me_fibnum; 89 const struct encaptab *me_ecookie; 90 struct in_addr me_src; 91 struct in_addr me_dst; 92}; 93#define ME2IFP(sc) ((sc)->me_ifp) 94#define ME_READY(sc) ((sc)->me_src.s_addr != 0) 95#define ME_LOCK_INIT(sc) rm_init(&(sc)->me_lock, "me softc") 96#define ME_LOCK_DESTROY(sc) rm_destroy(&(sc)->me_lock) 97#define ME_RLOCK_TRACKER struct rm_priotracker me_tracker 98#define ME_RLOCK(sc) rm_rlock(&(sc)->me_lock, &me_tracker) 99#define ME_RUNLOCK(sc) rm_runlock(&(sc)->me_lock, &me_tracker) 100#define ME_RLOCK_ASSERT(sc) rm_assert(&(sc)->me_lock, RA_RLOCKED) 101#define ME_WLOCK(sc) rm_wlock(&(sc)->me_lock) 102#define ME_WUNLOCK(sc) rm_wunlock(&(sc)->me_lock) 103#define ME_WLOCK_ASSERT(sc) rm_assert(&(sc)->me_lock, RA_WLOCKED) 104 105#define ME_LIST_LOCK_INIT(x) mtx_init(&V_me_mtx, "me_mtx", NULL, MTX_DEF) 106#define ME_LIST_LOCK_DESTROY(x) mtx_destroy(&V_me_mtx) 107#define ME_LIST_LOCK(x) mtx_lock(&V_me_mtx) 108#define ME_LIST_UNLOCK(x) mtx_unlock(&V_me_mtx) 109 110static VNET_DEFINE(LIST_HEAD(, me_softc), me_softc_list); 111#define V_me_softc_list VNET(me_softc_list) 112static struct sx me_ioctl_sx; 113SX_SYSINIT(me_ioctl_sx, &me_ioctl_sx, "me_ioctl"); 114 115static int me_clone_create(struct if_clone *, int, caddr_t); 116static void me_clone_destroy(struct ifnet *); 117static VNET_DEFINE(struct if_clone *, me_cloner); 118#define V_me_cloner VNET(me_cloner) 119 120static void me_qflush(struct ifnet *); 121static int me_transmit(struct ifnet *, struct mbuf *); 122static int me_ioctl(struct ifnet *, u_long, caddr_t); 123static int me_output(struct ifnet *, struct mbuf *, 124 const struct sockaddr *, struct route *); 125static int me_input(struct mbuf **, int *, int); 126 127static int me_set_tunnel(struct ifnet *, struct sockaddr_in *, 128 struct sockaddr_in *); 129static void me_delete_tunnel(struct ifnet *); 130 131SYSCTL_DECL(_net_link); 132static SYSCTL_NODE(_net_link, IFT_TUNNEL, me, CTLFLAG_RW, 0, 133 "Minimal Encapsulation for IP (RFC 2004)"); 134#ifndef MAX_ME_NEST 135#define MAX_ME_NEST 1 136#endif 137 138static VNET_DEFINE(int, max_me_nesting) = MAX_ME_NEST; 139#define V_max_me_nesting VNET(max_me_nesting) 140SYSCTL_INT(_net_link_me, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET, 141 &VNET_NAME(max_me_nesting), 0, "Max nested tunnels"); 142 143extern struct domain inetdomain; 144static const struct protosw in_mobile_protosw = { 145 .pr_type = SOCK_RAW, 146 .pr_domain = &inetdomain, 147 .pr_protocol = IPPROTO_MOBILE, 148 .pr_flags = PR_ATOMIC|PR_ADDR, 149 .pr_input = me_input, 150 .pr_output = rip_output, 151 .pr_ctlinput = rip_ctlinput, 152 .pr_ctloutput = rip_ctloutput, 153 .pr_usrreqs = &rip_usrreqs 154}; 155 156static void 157vnet_me_init(const void *unused __unused) 158{ 159 LIST_INIT(&V_me_softc_list); 160 ME_LIST_LOCK_INIT(); 161 V_me_cloner = if_clone_simple(mename, me_clone_create, 162 me_clone_destroy, 0); 163} 164VNET_SYSINIT(vnet_me_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 165 vnet_me_init, NULL); 166 167static void 168vnet_me_uninit(const void *unused __unused) 169{ 170 171 if_clone_detach(V_me_cloner); 172 ME_LIST_LOCK_DESTROY(); 173} 174VNET_SYSUNINIT(vnet_me_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 175 vnet_me_uninit, NULL); 176 177static int 178me_clone_create(struct if_clone *ifc, int unit, caddr_t params) 179{ 180 struct me_softc *sc; 181 182 sc = malloc(sizeof(struct me_softc), M_IFME, M_WAITOK | M_ZERO); 183 sc->me_fibnum = curthread->td_proc->p_fibnum; 184 ME2IFP(sc) = if_alloc(IFT_TUNNEL); 185 ME_LOCK_INIT(sc); 186 ME2IFP(sc)->if_softc = sc; 187 if_initname(ME2IFP(sc), mename, unit); 188 189 ME2IFP(sc)->if_mtu = MEMTU - sizeof(struct mobhdr); 190 ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 191 ME2IFP(sc)->if_output = me_output; 192 ME2IFP(sc)->if_ioctl = me_ioctl; 193 ME2IFP(sc)->if_transmit = me_transmit; 194 ME2IFP(sc)->if_qflush = me_qflush; 195 if_attach(ME2IFP(sc)); 196 bpfattach(ME2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 197 ME_LIST_LOCK(); 198 LIST_INSERT_HEAD(&V_me_softc_list, sc, me_list); 199 ME_LIST_UNLOCK(); 200 return (0); 201} 202 203static void 204me_clone_destroy(struct ifnet *ifp) 205{ 206 struct me_softc *sc; 207 208 sx_xlock(&me_ioctl_sx); 209 sc = ifp->if_softc; 210 me_delete_tunnel(ifp); 211 ME_LIST_LOCK(); 212 LIST_REMOVE(sc, me_list); 213 ME_LIST_UNLOCK(); 214 bpfdetach(ifp); 215 if_detach(ifp); 216 ifp->if_softc = NULL; 217 sx_xunlock(&me_ioctl_sx); 218 219 if_free(ifp); 220 ME_LOCK_DESTROY(sc); 221 free(sc, M_IFME); 222} 223 224static int 225me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 226{ 227 ME_RLOCK_TRACKER; 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 - sizeof(struct mobhdr); 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 sockaddr_in *) 256 &(((struct in_aliasreq *)data)->ifra_addr); 257 dst = (struct sockaddr_in *) 258 &(((struct in_aliasreq *)data)->ifra_dstaddr); 259 if (src->sin_family != dst->sin_family || 260 src->sin_family != AF_INET || 261 src->sin_len != dst->sin_len || 262 src->sin_len != sizeof(struct sockaddr_in)) { 263 error = EINVAL; 264 break; 265 } 266 if (src->sin_addr.s_addr == INADDR_ANY || 267 dst->sin_addr.s_addr == INADDR_ANY) { 268 error = EADDRNOTAVAIL; 269 break; 270 } 271 error = me_set_tunnel(ifp, src, dst); 272 break; 273 case SIOCDIFPHYADDR: 274 me_delete_tunnel(ifp); 275 break; 276 case SIOCGIFPSRCADDR: 277 case SIOCGIFPDSTADDR: 278 ME_RLOCK(sc); 279 if (!ME_READY(sc)) { 280 error = EADDRNOTAVAIL; 281 ME_RUNLOCK(sc); 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 ME_RUNLOCK(sc); 297 error = prison_if(curthread->td_ucred, sintosa(src)); 298 if (error != 0) 299 memset(src, 0, sizeof(*src)); 300 break; 301 case SIOCGTUNFIB: 302 ifr->ifr_fib = sc->me_fibnum; 303 break; 304 case SIOCSTUNFIB: 305 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 306 break; 307 if (ifr->ifr_fib >= rt_numfibs) 308 error = EINVAL; 309 else 310 sc->me_fibnum = ifr->ifr_fib; 311 break; 312 default: 313 error = EINVAL; 314 break; 315 } 316end: 317 sx_xunlock(&me_ioctl_sx); 318 return (error); 319} 320 321static int 322me_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 323{ 324 ME_RLOCK_TRACKER; 325 struct me_softc *sc; 326 struct ip *ip; 327 int ret; 328 329 sc = (struct me_softc *)arg; 330 if ((ME2IFP(sc)->if_flags & IFF_UP) == 0) 331 return (0); 332 333 M_ASSERTPKTHDR(m); 334 335 if (m->m_pkthdr.len < sizeof(struct ip) + sizeof(struct mobhdr) - 336 sizeof(struct in_addr)) 337 return (0); 338 339 ret = 0; 340 ME_RLOCK(sc); 341 if (ME_READY(sc)) { 342 ip = mtod(m, struct ip *); 343 if (sc->me_src.s_addr == ip->ip_dst.s_addr && 344 sc->me_dst.s_addr == ip->ip_src.s_addr) 345 ret = 32 * 2; 346 } 347 ME_RUNLOCK(sc); 348 return (ret); 349} 350 351static int 352me_set_tunnel(struct ifnet *ifp, struct sockaddr_in *src, 353 struct sockaddr_in *dst) 354{ 355 struct me_softc *sc, *tsc; 356 357 sx_assert(&me_ioctl_sx, SA_XLOCKED); 358 ME_LIST_LOCK(); 359 sc = ifp->if_softc; 360 LIST_FOREACH(tsc, &V_me_softc_list, me_list) { 361 if (tsc == sc || !ME_READY(tsc)) 362 continue; 363 if (tsc->me_src.s_addr == src->sin_addr.s_addr && 364 tsc->me_dst.s_addr == dst->sin_addr.s_addr) { 365 ME_LIST_UNLOCK(); 366 return (EADDRNOTAVAIL); 367 } 368 } 369 ME_LIST_UNLOCK(); 370 371 ME_WLOCK(sc); 372 sc->me_dst = dst->sin_addr; 373 sc->me_src = src->sin_addr; 374 ME_WUNLOCK(sc); 375 376 if (sc->me_ecookie == NULL) 377 sc->me_ecookie = encap_attach_func(AF_INET, IPPROTO_MOBILE, 378 me_encapcheck, &in_mobile_protosw, sc); 379 if (sc->me_ecookie != NULL) 380 ifp->if_drv_flags |= IFF_DRV_RUNNING; 381 return (0); 382} 383 384static void 385me_delete_tunnel(struct ifnet *ifp) 386{ 387 struct me_softc *sc = ifp->if_softc; 388 389 sx_assert(&me_ioctl_sx, SA_XLOCKED); 390 if (sc->me_ecookie != NULL) 391 encap_detach(sc->me_ecookie); 392 sc->me_ecookie = NULL; 393 ME_WLOCK(sc); 394 sc->me_src.s_addr = 0; 395 sc->me_dst.s_addr = 0; 396 ME_WUNLOCK(sc); 397 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 398} 399 400static uint16_t 401me_in_cksum(uint16_t *p, int nwords) 402{ 403 uint32_t sum = 0; 404 405 while (nwords-- > 0) 406 sum += *p++; 407 sum = (sum >> 16) + (sum & 0xffff); 408 sum += (sum >> 16); 409 return (~sum); 410} 411 412int 413me_input(struct mbuf **mp, int *offp, int proto) 414{ 415 struct me_softc *sc; 416 struct mobhdr *mh; 417 struct ifnet *ifp; 418 struct mbuf *m; 419 struct ip *ip; 420 int hlen; 421 422 m = *mp; 423 sc = encap_getarg(m); 424 KASSERT(sc != NULL, ("encap_getarg returned NULL")); 425 426 ifp = ME2IFP(sc); 427 /* checks for short packets */ 428 hlen = sizeof(struct mobhdr); 429 if (m->m_pkthdr.len < sizeof(struct ip) + hlen) 430 hlen -= sizeof(struct in_addr); 431 if (m->m_len < sizeof(struct ip) + hlen) 432 m = m_pullup(m, sizeof(struct ip) + hlen); 433 if (m == NULL) 434 goto drop; 435 mh = (struct mobhdr *)mtodo(m, sizeof(struct ip)); 436 /* check for wrong flags */ 437 if (mh->mob_flags & (~MOB_FLAGS_SP)) { 438 m_freem(m); 439 goto drop; 440 } 441 if (mh->mob_flags) { 442 if (hlen != sizeof(struct mobhdr)) { 443 m_freem(m); 444 goto drop; 445 } 446 } else 447 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 448 /* check mobile header checksum */ 449 if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) { 450 m_freem(m); 451 goto drop; 452 } 453#ifdef MAC 454 mac_ifnet_create_mbuf(ifp, m); 455#endif 456 ip = mtod(m, struct ip *); 457 ip->ip_dst = mh->mob_dst; 458 ip->ip_p = mh->mob_proto; 459 ip->ip_sum = 0; 460 ip->ip_len = htons(m->m_pkthdr.len - hlen); 461 if (mh->mob_flags) 462 ip->ip_src = mh->mob_src; 463 memmove(mtodo(m, hlen), ip, sizeof(struct ip)); 464 m_adj(m, hlen); 465 m_clrprotoflags(m); 466 m->m_pkthdr.rcvif = ifp; 467 m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 468 M_SETFIB(m, ifp->if_fib); 469 hlen = AF_INET; 470 BPF_MTAP2(ifp, &hlen, sizeof(hlen), m); 471 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 472 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 473 if ((ifp->if_flags & IFF_MONITOR) != 0) 474 m_freem(m); 475 else 476 netisr_dispatch(NETISR_IP, m); 477 return (IPPROTO_DONE); 478drop: 479 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 480 return (IPPROTO_DONE); 481} 482 483#define MTAG_ME 1414491977 484static int 485me_check_nesting(struct ifnet *ifp, struct mbuf *m) 486{ 487 struct m_tag *mtag; 488 int count; 489 490 count = 1; 491 mtag = NULL; 492 while ((mtag = m_tag_locate(m, MTAG_ME, 0, mtag)) != NULL) { 493 if (*(struct ifnet **)(mtag + 1) == ifp) { 494 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname); 495 return (EIO); 496 } 497 count++; 498 } 499 if (count > V_max_me_nesting) { 500 log(LOG_NOTICE, 501 "%s: if_output recursively called too many times(%d)\n", 502 ifp->if_xname, count); 503 return (EIO); 504 } 505 mtag = m_tag_alloc(MTAG_ME, 0, sizeof(struct ifnet *), M_NOWAIT); 506 if (mtag == NULL) 507 return (ENOMEM); 508 *(struct ifnet **)(mtag + 1) = ifp; 509 m_tag_prepend(m, mtag); 510 return (0); 511} 512 513static int 514me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 515 struct route *ro) 516{ 517 uint32_t af; 518 int error; 519 520#ifdef MAC 521 error = mac_ifnet_check_transmit(ifp, m); 522 if (error != 0) 523 goto drop; 524#endif 525 if ((ifp->if_flags & IFF_MONITOR) != 0 || 526 (ifp->if_flags & IFF_UP) == 0) { 527 error = ENETDOWN; 528 goto drop; 529 } 530 531 error = me_check_nesting(ifp, m); 532 if (error != 0) 533 goto drop; 534 535 m->m_flags &= ~(M_BCAST|M_MCAST); 536 if (dst->sa_family == AF_UNSPEC) 537 bcopy(dst->sa_data, &af, sizeof(af)); 538 else 539 af = dst->sa_family; 540 if (af != AF_INET) { 541 error = EAFNOSUPPORT; 542 goto drop; 543 } 544 BPF_MTAP2(ifp, &af, sizeof(af), m); 545 return (ifp->if_transmit(ifp, m)); 546drop: 547 m_freem(m); 548 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 549 return (error); 550} 551 552static int 553me_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 int error, hlen, plen; 560 561 sc = ifp->if_softc; 562 if (sc == NULL) { 563 error = ENETDOWN; 564 m_freem(m); 565 goto drop; 566 } 567 if (m->m_len < sizeof(struct ip)) 568 m = m_pullup(m, sizeof(struct ip)); 569 if (m == NULL) { 570 error = ENOBUFS; 571 goto drop; 572 } 573 ip = mtod(m, struct ip *); 574 /* Fragmented datagramms shouldn't be encapsulated */ 575 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 576 error = EINVAL; 577 m_freem(m); 578 goto drop; 579 } 580 mh.mob_proto = ip->ip_p; 581 mh.mob_src = ip->ip_src; 582 mh.mob_dst = ip->ip_dst; 583 ME_RLOCK(sc); 584 if (!ME_READY(sc)) { 585 ME_RUNLOCK(sc); 586 error = ENETDOWN; 587 m_freem(m); 588 goto drop; 589 } 590 if (in_hosteq(sc->me_src, ip->ip_src)) { 591 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 592 mh.mob_flags = 0; 593 } else { 594 hlen = sizeof(struct mobhdr); 595 mh.mob_flags = MOB_FLAGS_SP; 596 } 597 plen = m->m_pkthdr.len; 598 ip->ip_src = sc->me_src; 599 ip->ip_dst = sc->me_dst; 600 M_SETFIB(m, sc->me_fibnum); 601 ME_RUNLOCK(sc); 602 M_PREPEND(m, hlen, M_NOWAIT); 603 if (m == NULL) { 604 error = ENOBUFS; 605 goto drop; 606 } 607 if (m->m_len < sizeof(struct ip) + hlen) 608 m = m_pullup(m, sizeof(struct ip) + hlen); 609 if (m == NULL) { 610 error = ENOBUFS; 611 goto drop; 612 } 613 memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip)); 614 ip = mtod(m, struct ip *); 615 ip->ip_len = htons(m->m_pkthdr.len); 616 ip->ip_p = IPPROTO_MOBILE; 617 ip->ip_sum = 0; 618 mh.mob_csum = 0; 619 mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t)); 620 bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen); 621 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 622drop: 623 if (error) 624 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 625 else { 626 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 627 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); 628 } 629 return (error); 630} 631 632static void 633me_qflush(struct ifnet *ifp __unused) 634{ 635 636} 637 638static int 639memodevent(module_t mod, int type, void *data) 640{ 641 642 switch (type) { 643 case MOD_LOAD: 644 case MOD_UNLOAD: 645 break; 646 default: 647 return (EOPNOTSUPP); 648 } 649 return (0); 650} 651 652static moduledata_t me_mod = { 653 "if_me", 654 memodevent, 655 0 656}; 657 658DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 659MODULE_VERSION(if_me, 1); 660