if_me.c revision 284073
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: stable/10/sys/net/if_me.c 284073 2015-06-06 13:29:41Z 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 58#include <netinet/in.h> 59#include <netinet/in_systm.h> 60#include <netinet/in_var.h> 61#include <netinet/ip.h> 62#include <netinet/ip_var.h> 63#include <netinet/ip_encap.h> 64 65#include <machine/in_cksum.h> 66#include <security/mac/mac_framework.h> 67 68#define MEMTU 1500 69static const char mename[] = "me"; 70static MALLOC_DEFINE(M_IFME, mename, "Minimal Encapsulation for IP"); 71static VNET_DEFINE(struct mtx, me_mtx); 72#define V_me_mtx VNET(me_mtx) 73/* Minimal forwarding header RFC 2004 */ 74struct mobhdr { 75 uint8_t mob_proto; /* protocol */ 76 uint8_t mob_flags; /* flags */ 77#define MOB_FLAGS_SP 0x80 /* source present */ 78 uint16_t mob_csum; /* header checksum */ 79 struct in_addr mob_dst; /* original destination address */ 80 struct in_addr mob_src; /* original source addr (optional) */ 81} __packed; 82 83struct me_softc { 84 struct ifnet *me_ifp; 85 LIST_ENTRY(me_softc) me_list; 86 struct rmlock me_lock; 87 u_int me_fibnum; 88 const struct encaptab *me_ecookie; 89 struct in_addr me_src; 90 struct in_addr me_dst; 91}; 92#define ME2IFP(sc) ((sc)->me_ifp) 93#define ME_READY(sc) ((sc)->me_src.s_addr != 0) 94#define ME_LOCK_INIT(sc) rm_init(&(sc)->me_lock, "me softc") 95#define ME_LOCK_DESTROY(sc) rm_destroy(&(sc)->me_lock) 96#define ME_RLOCK_TRACKER struct rm_priotracker me_tracker 97#define ME_RLOCK(sc) rm_rlock(&(sc)->me_lock, &me_tracker) 98#define ME_RUNLOCK(sc) rm_runlock(&(sc)->me_lock, &me_tracker) 99#define ME_RLOCK_ASSERT(sc) rm_assert(&(sc)->me_lock, RA_RLOCKED) 100#define ME_WLOCK(sc) rm_wlock(&(sc)->me_lock) 101#define ME_WUNLOCK(sc) rm_wunlock(&(sc)->me_lock) 102#define ME_WLOCK_ASSERT(sc) rm_assert(&(sc)->me_lock, RA_WLOCKED) 103 104#define ME_LIST_LOCK_INIT(x) mtx_init(&V_me_mtx, "me_mtx", NULL, MTX_DEF) 105#define ME_LIST_LOCK_DESTROY(x) mtx_destroy(&V_me_mtx) 106#define ME_LIST_LOCK(x) mtx_lock(&V_me_mtx) 107#define ME_LIST_UNLOCK(x) mtx_unlock(&V_me_mtx) 108 109static VNET_DEFINE(LIST_HEAD(, me_softc), me_softc_list); 110#define V_me_softc_list VNET(me_softc_list) 111static struct sx me_ioctl_sx; 112SX_SYSINIT(me_ioctl_sx, &me_ioctl_sx, "me_ioctl"); 113 114static int me_clone_create(struct if_clone *, int, caddr_t); 115static void me_clone_destroy(struct ifnet *); 116static VNET_DEFINE(struct if_clone *, me_cloner); 117#define V_me_cloner VNET(me_cloner) 118 119static void me_qflush(struct ifnet *); 120static int me_transmit(struct ifnet *, struct mbuf *); 121static int me_ioctl(struct ifnet *, u_long, caddr_t); 122static int me_output(struct ifnet *, struct mbuf *, 123 const struct sockaddr *, struct route *); 124static int me_input(struct mbuf **, int *, int); 125 126static int me_set_tunnel(struct ifnet *, struct sockaddr_in *, 127 struct sockaddr_in *); 128static void me_delete_tunnel(struct ifnet *); 129 130SYSCTL_DECL(_net_link); 131static SYSCTL_NODE(_net_link, IFT_TUNNEL, me, CTLFLAG_RW, 0, 132 "Minimal Encapsulation for IP (RFC 2004)"); 133#ifndef MAX_ME_NEST 134#define MAX_ME_NEST 1 135#endif 136 137static VNET_DEFINE(int, max_me_nesting) = MAX_ME_NEST; 138#define V_max_me_nesting VNET(max_me_nesting) 139SYSCTL_INT(_net_link_me, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET, 140 &VNET_NAME(max_me_nesting), 0, "Max nested tunnels"); 141 142extern struct domain inetdomain; 143static void me_input10(struct mbuf *, int); 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_input10, 150 .pr_output = (pr_output_t *)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 default: 302 error = EINVAL; 303 break; 304 } 305end: 306 sx_xunlock(&me_ioctl_sx); 307 return (error); 308} 309 310static int 311me_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 312{ 313 ME_RLOCK_TRACKER; 314 struct me_softc *sc; 315 struct ip *ip; 316 int ret; 317 318 sc = (struct me_softc *)arg; 319 if ((ME2IFP(sc)->if_flags & IFF_UP) == 0) 320 return (0); 321 322 M_ASSERTPKTHDR(m); 323 324 if (m->m_pkthdr.len < sizeof(struct ip) + sizeof(struct mobhdr) - 325 sizeof(struct in_addr)) 326 return (0); 327 328 ret = 0; 329 ME_RLOCK(sc); 330 if (ME_READY(sc)) { 331 ip = mtod(m, struct ip *); 332 if (sc->me_src.s_addr == ip->ip_dst.s_addr && 333 sc->me_dst.s_addr == ip->ip_src.s_addr) 334 ret = 32 * 2; 335 } 336 ME_RUNLOCK(sc); 337 return (ret); 338} 339 340static int 341me_set_tunnel(struct ifnet *ifp, struct sockaddr_in *src, 342 struct sockaddr_in *dst) 343{ 344 struct me_softc *sc, *tsc; 345 346 sx_assert(&me_ioctl_sx, SA_XLOCKED); 347 ME_LIST_LOCK(); 348 sc = ifp->if_softc; 349 LIST_FOREACH(tsc, &V_me_softc_list, me_list) { 350 if (tsc == sc || !ME_READY(tsc)) 351 continue; 352 if (tsc->me_src.s_addr == src->sin_addr.s_addr && 353 tsc->me_dst.s_addr == dst->sin_addr.s_addr) { 354 ME_LIST_UNLOCK(); 355 return (EADDRNOTAVAIL); 356 } 357 } 358 ME_LIST_UNLOCK(); 359 360 ME_WLOCK(sc); 361 sc->me_dst = dst->sin_addr; 362 sc->me_src = src->sin_addr; 363 ME_WUNLOCK(sc); 364 365 if (sc->me_ecookie == NULL) 366 sc->me_ecookie = encap_attach_func(AF_INET, IPPROTO_MOBILE, 367 me_encapcheck, &in_mobile_protosw, sc); 368 if (sc->me_ecookie != NULL) 369 ifp->if_drv_flags |= IFF_DRV_RUNNING; 370 return (0); 371} 372 373static void 374me_delete_tunnel(struct ifnet *ifp) 375{ 376 struct me_softc *sc = ifp->if_softc; 377 378 sx_assert(&me_ioctl_sx, SA_XLOCKED); 379 if (sc->me_ecookie != NULL) 380 encap_detach(sc->me_ecookie); 381 sc->me_ecookie = NULL; 382 ME_WLOCK(sc); 383 sc->me_src.s_addr = 0; 384 sc->me_dst.s_addr = 0; 385 ME_WUNLOCK(sc); 386 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 387} 388 389static uint16_t 390me_in_cksum(uint16_t *p, int nwords) 391{ 392 uint32_t sum = 0; 393 394 while (nwords-- > 0) 395 sum += *p++; 396 sum = (sum >> 16) + (sum & 0xffff); 397 sum += (sum >> 16); 398 return (~sum); 399} 400 401static void 402me_input10(struct mbuf *m, int off) 403{ 404 int proto; 405 406 proto = (mtod(m, struct ip *))->ip_p; 407 me_input(&m, &off, proto); 408} 409 410int 411me_input(struct mbuf **mp, int *offp, int proto) 412{ 413 struct me_softc *sc; 414 struct mobhdr *mh; 415 struct ifnet *ifp; 416 struct mbuf *m; 417 struct ip *ip; 418 int hlen; 419 420 m = *mp; 421 sc = encap_getarg(m); 422 KASSERT(sc != NULL, ("encap_getarg returned NULL")); 423 424 ifp = ME2IFP(sc); 425 /* checks for short packets */ 426 hlen = sizeof(struct mobhdr); 427 if (m->m_pkthdr.len < sizeof(struct ip) + hlen) 428 hlen -= sizeof(struct in_addr); 429 if (m->m_len < sizeof(struct ip) + hlen) 430 m = m_pullup(m, sizeof(struct ip) + hlen); 431 if (m == NULL) 432 goto drop; 433 mh = (struct mobhdr *)mtodo(m, sizeof(struct ip)); 434 /* check for wrong flags */ 435 if (mh->mob_flags & (~MOB_FLAGS_SP)) { 436 m_freem(m); 437 goto drop; 438 } 439 if (mh->mob_flags) { 440 if (hlen != sizeof(struct mobhdr)) { 441 m_freem(m); 442 goto drop; 443 } 444 } else 445 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 446 /* check mobile header checksum */ 447 if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) { 448 m_freem(m); 449 goto drop; 450 } 451#ifdef MAC 452 mac_ifnet_create_mbuf(ifp, m); 453#endif 454 ip = mtod(m, struct ip *); 455 ip->ip_dst = mh->mob_dst; 456 ip->ip_p = mh->mob_proto; 457 ip->ip_sum = 0; 458 ip->ip_len = htons(m->m_pkthdr.len - hlen); 459 if (mh->mob_flags) 460 ip->ip_src = mh->mob_src; 461 memmove(mtodo(m, hlen), ip, sizeof(struct ip)); 462 m_adj(m, hlen); 463 m_clrprotoflags(m); 464 m->m_pkthdr.rcvif = ifp; 465 m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 466 M_SETFIB(m, sc->me_fibnum); 467 hlen = AF_INET; 468 BPF_MTAP2(ifp, &hlen, sizeof(hlen), m); 469 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 470 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 471 if ((ifp->if_flags & IFF_MONITOR) != 0) 472 m_freem(m); 473 else 474 netisr_dispatch(NETISR_IP, m); 475 return (IPPROTO_DONE); 476drop: 477 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 478 return (IPPROTO_DONE); 479} 480 481#define MTAG_ME 1414491977 482static int 483me_check_nesting(struct ifnet *ifp, struct mbuf *m) 484{ 485 struct m_tag *mtag; 486 int count; 487 488 count = 1; 489 mtag = NULL; 490 while ((mtag = m_tag_locate(m, MTAG_ME, 0, mtag)) != NULL) { 491 if (*(struct ifnet **)(mtag + 1) == ifp) { 492 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname); 493 return (EIO); 494 } 495 count++; 496 } 497 if (count > V_max_me_nesting) { 498 log(LOG_NOTICE, 499 "%s: if_output recursively called too many times(%d)\n", 500 ifp->if_xname, count); 501 return (EIO); 502 } 503 mtag = m_tag_alloc(MTAG_ME, 0, sizeof(struct ifnet *), M_NOWAIT); 504 if (mtag == NULL) 505 return (ENOMEM); 506 *(struct ifnet **)(mtag + 1) = ifp; 507 m_tag_prepend(m, mtag); 508 return (0); 509} 510 511static int 512me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 513 struct route *ro) 514{ 515 uint32_t af; 516 int error; 517 518#ifdef MAC 519 error = mac_ifnet_check_transmit(ifp, m); 520 if (error != 0) 521 goto drop; 522#endif 523 if ((ifp->if_flags & IFF_MONITOR) != 0 || 524 (ifp->if_flags & IFF_UP) == 0) { 525 error = ENETDOWN; 526 goto drop; 527 } 528 529 error = me_check_nesting(ifp, m); 530 if (error != 0) 531 goto drop; 532 533 m->m_flags &= ~(M_BCAST|M_MCAST); 534 if (dst->sa_family == AF_UNSPEC) 535 bcopy(dst->sa_data, &af, sizeof(af)); 536 else 537 af = dst->sa_family; 538 if (af != AF_INET) { 539 error = EAFNOSUPPORT; 540 goto drop; 541 } 542 BPF_MTAP2(ifp, &af, sizeof(af), m); 543 return (ifp->if_transmit(ifp, m)); 544drop: 545 m_freem(m); 546 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 547 return (error); 548} 549 550static int 551me_transmit(struct ifnet *ifp, struct mbuf *m) 552{ 553 ME_RLOCK_TRACKER; 554 struct mobhdr mh; 555 struct me_softc *sc; 556 struct ip *ip; 557 int error, hlen, plen; 558 559 sc = ifp->if_softc; 560 if (sc == NULL) { 561 error = ENETDOWN; 562 m_freem(m); 563 goto drop; 564 } 565 if (m->m_len < sizeof(struct ip)) 566 m = m_pullup(m, sizeof(struct ip)); 567 if (m == NULL) { 568 error = ENOBUFS; 569 goto drop; 570 } 571 ip = mtod(m, struct ip *); 572 /* Fragmented datagramms shouldn't be encapsulated */ 573 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 574 error = EINVAL; 575 m_freem(m); 576 goto drop; 577 } 578 mh.mob_proto = ip->ip_p; 579 mh.mob_src = ip->ip_src; 580 mh.mob_dst = ip->ip_dst; 581 ME_RLOCK(sc); 582 if (!ME_READY(sc)) { 583 ME_RUNLOCK(sc); 584 error = ENETDOWN; 585 m_freem(m); 586 goto drop; 587 } 588 if (in_hosteq(sc->me_src, ip->ip_src)) { 589 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 590 mh.mob_flags = 0; 591 } else { 592 hlen = sizeof(struct mobhdr); 593 mh.mob_flags = MOB_FLAGS_SP; 594 } 595 plen = m->m_pkthdr.len; 596 ip->ip_src = sc->me_src; 597 ip->ip_dst = sc->me_dst; 598 M_SETFIB(m, sc->me_fibnum); 599 ME_RUNLOCK(sc); 600 M_PREPEND(m, hlen, M_NOWAIT); 601 if (m == NULL) { 602 error = ENOBUFS; 603 goto drop; 604 } 605 if (m->m_len < sizeof(struct ip) + hlen) 606 m = m_pullup(m, sizeof(struct ip) + hlen); 607 if (m == NULL) { 608 error = ENOBUFS; 609 goto drop; 610 } 611 memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip)); 612 ip = mtod(m, struct ip *); 613 ip->ip_len = htons(m->m_pkthdr.len); 614 ip->ip_p = IPPROTO_MOBILE; 615 ip->ip_sum = 0; 616 mh.mob_csum = 0; 617 mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t)); 618 bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen); 619 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 620drop: 621 if (error) 622 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 623 else { 624 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 625 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); 626 } 627 return (error); 628} 629 630static void 631me_qflush(struct ifnet *ifp __unused) 632{ 633 634} 635 636static int 637memodevent(module_t mod, int type, void *data) 638{ 639 640 switch (type) { 641 case MOD_LOAD: 642 case MOD_UNLOAD: 643 break; 644 default: 645 return (EOPNOTSUPP); 646 } 647 return (0); 648} 649 650static moduledata_t me_mod = { 651 "if_me", 652 memodevent, 653 0 654}; 655 656DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 657MODULE_VERSION(if_me, 1); 658