if_me.c revision 274246
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 274246 2014-11-07 19:13:19Z 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 const struct protosw in_mobile_protosw = { 144 .pr_type = SOCK_RAW, 145 .pr_domain = &inetdomain, 146 .pr_protocol = IPPROTO_MOBILE, 147 .pr_flags = PR_ATOMIC|PR_ADDR, 148 .pr_input = me_input, 149 .pr_output = rip_output, 150 .pr_ctlinput = rip_ctlinput, 151 .pr_ctloutput = rip_ctloutput, 152 .pr_usrreqs = &rip_usrreqs 153}; 154 155static void 156vnet_me_init(const void *unused __unused) 157{ 158 LIST_INIT(&V_me_softc_list); 159 ME_LIST_LOCK_INIT(); 160 V_me_cloner = if_clone_simple(mename, me_clone_create, 161 me_clone_destroy, 0); 162} 163VNET_SYSINIT(vnet_me_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 164 vnet_me_init, NULL); 165 166static void 167vnet_me_uninit(const void *unused __unused) 168{ 169 170 if_clone_detach(V_me_cloner); 171 ME_LIST_LOCK_DESTROY(); 172} 173VNET_SYSUNINIT(vnet_me_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 174 vnet_me_uninit, NULL); 175 176static int 177me_clone_create(struct if_clone *ifc, int unit, caddr_t params) 178{ 179 struct me_softc *sc; 180 181 sc = malloc(sizeof(struct me_softc), M_IFME, M_WAITOK | M_ZERO); 182 sc->me_fibnum = curthread->td_proc->p_fibnum; 183 ME2IFP(sc) = if_alloc(IFT_TUNNEL); 184 ME_LOCK_INIT(sc); 185 ME2IFP(sc)->if_softc = sc; 186 if_initname(ME2IFP(sc), mename, unit); 187 188 ME2IFP(sc)->if_mtu = MEMTU - sizeof(struct mobhdr); 189 ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 190 ME2IFP(sc)->if_output = me_output; 191 ME2IFP(sc)->if_ioctl = me_ioctl; 192 ME2IFP(sc)->if_transmit = me_transmit; 193 ME2IFP(sc)->if_qflush = me_qflush; 194 if_attach(ME2IFP(sc)); 195 bpfattach(ME2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 196 ME_LIST_LOCK(); 197 LIST_INSERT_HEAD(&V_me_softc_list, sc, me_list); 198 ME_LIST_UNLOCK(); 199 return (0); 200} 201 202static void 203me_clone_destroy(struct ifnet *ifp) 204{ 205 struct me_softc *sc; 206 207 sx_xlock(&me_ioctl_sx); 208 sc = ifp->if_softc; 209 me_delete_tunnel(ifp); 210 ME_LIST_LOCK(); 211 LIST_REMOVE(sc, me_list); 212 ME_LIST_UNLOCK(); 213 bpfdetach(ifp); 214 if_detach(ifp); 215 ifp->if_softc = NULL; 216 sx_xunlock(&me_ioctl_sx); 217 218 if_free(ifp); 219 ME_LOCK_DESTROY(sc); 220 free(sc, M_IFME); 221} 222 223static int 224me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 225{ 226 ME_RLOCK_TRACKER; 227 struct ifreq *ifr = (struct ifreq *)data; 228 struct sockaddr_in *src, *dst; 229 struct me_softc *sc; 230 int error; 231 232 switch (cmd) { 233 case SIOCSIFMTU: 234 if (ifr->ifr_mtu < 576) 235 return (EINVAL); 236 ifp->if_mtu = ifr->ifr_mtu - sizeof(struct mobhdr); 237 return (0); 238 case SIOCSIFADDR: 239 ifp->if_flags |= IFF_UP; 240 case SIOCSIFFLAGS: 241 case SIOCADDMULTI: 242 case SIOCDELMULTI: 243 return (0); 244 } 245 sx_xlock(&me_ioctl_sx); 246 sc = ifp->if_softc; 247 if (sc == NULL) { 248 error = ENXIO; 249 goto end; 250 } 251 error = 0; 252 switch (cmd) { 253 case SIOCSIFPHYADDR: 254 src = (struct sockaddr_in *) 255 &(((struct in_aliasreq *)data)->ifra_addr); 256 dst = (struct sockaddr_in *) 257 &(((struct in_aliasreq *)data)->ifra_dstaddr); 258 if (src->sin_family != dst->sin_family || 259 src->sin_family != AF_INET || 260 src->sin_len != dst->sin_len || 261 src->sin_len != sizeof(struct sockaddr_in)) { 262 error = EINVAL; 263 break; 264 } 265 if (src->sin_addr.s_addr == INADDR_ANY || 266 dst->sin_addr.s_addr == INADDR_ANY) { 267 error = EADDRNOTAVAIL; 268 break; 269 } 270 error = me_set_tunnel(ifp, src, dst); 271 break; 272 case SIOCDIFPHYADDR: 273 me_delete_tunnel(ifp); 274 break; 275 case SIOCGIFPSRCADDR: 276 case SIOCGIFPDSTADDR: 277 ME_RLOCK(sc); 278 if (!ME_READY(sc)) { 279 error = EADDRNOTAVAIL; 280 ME_RUNLOCK(sc); 281 break; 282 } 283 src = (struct sockaddr_in *)&ifr->ifr_addr; 284 memset(src, 0, sizeof(*src)); 285 src->sin_family = AF_INET; 286 src->sin_len = sizeof(*src); 287 switch (cmd) { 288 case SIOCGIFPSRCADDR: 289 src->sin_addr = sc->me_src; 290 break; 291 case SIOCGIFPDSTADDR: 292 src->sin_addr = sc->me_dst; 293 break; 294 } 295 ME_RUNLOCK(sc); 296 error = prison_if(curthread->td_ucred, sintosa(src)); 297 if (error != 0) 298 memset(src, 0, sizeof(*src)); 299 break; 300 default: 301 error = EINVAL; 302 break; 303 } 304end: 305 sx_xunlock(&me_ioctl_sx); 306 return (error); 307} 308 309static int 310me_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 311{ 312 ME_RLOCK_TRACKER; 313 struct me_softc *sc; 314 struct ip *ip; 315 int ret; 316 317 sc = (struct me_softc *)arg; 318 if ((ME2IFP(sc)->if_flags & IFF_UP) == 0) 319 return (0); 320 321 M_ASSERTPKTHDR(m); 322 323 if (m->m_pkthdr.len < sizeof(struct ip) + sizeof(struct mobhdr) - 324 sizeof(struct in_addr)) 325 return (0); 326 327 ret = 0; 328 ME_RLOCK(sc); 329 if (ME_READY(sc)) { 330 ip = mtod(m, struct ip *); 331 if (sc->me_src.s_addr == ip->ip_dst.s_addr && 332 sc->me_dst.s_addr == ip->ip_src.s_addr) 333 ret = 32 * 2; 334 } 335 ME_RUNLOCK(sc); 336 return (ret); 337} 338 339static int 340me_set_tunnel(struct ifnet *ifp, struct sockaddr_in *src, 341 struct sockaddr_in *dst) 342{ 343 struct me_softc *sc, *tsc; 344 345 sx_assert(&me_ioctl_sx, SA_XLOCKED); 346 ME_LIST_LOCK(); 347 sc = ifp->if_softc; 348 LIST_FOREACH(tsc, &V_me_softc_list, me_list) { 349 if (tsc == sc || !ME_READY(tsc)) 350 continue; 351 if (tsc->me_src.s_addr == src->sin_addr.s_addr && 352 tsc->me_dst.s_addr == dst->sin_addr.s_addr) { 353 ME_LIST_UNLOCK(); 354 return (EADDRNOTAVAIL); 355 } 356 } 357 ME_LIST_UNLOCK(); 358 359 ME_WLOCK(sc); 360 sc->me_dst = dst->sin_addr; 361 sc->me_src = src->sin_addr; 362 ME_WUNLOCK(sc); 363 364 if (sc->me_ecookie == NULL) 365 sc->me_ecookie = encap_attach_func(AF_INET, IPPROTO_MOBILE, 366 me_encapcheck, &in_mobile_protosw, sc); 367 if (sc->me_ecookie != NULL) 368 ifp->if_drv_flags |= IFF_DRV_RUNNING; 369 return (0); 370} 371 372static void 373me_delete_tunnel(struct ifnet *ifp) 374{ 375 struct me_softc *sc = ifp->if_softc; 376 377 sx_assert(&me_ioctl_sx, SA_XLOCKED); 378 if (sc->me_ecookie != NULL) 379 encap_detach(sc->me_ecookie); 380 sc->me_ecookie = NULL; 381 ME_WLOCK(sc); 382 sc->me_src.s_addr = 0; 383 sc->me_dst.s_addr = 0; 384 ME_WUNLOCK(sc); 385 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 386} 387 388static uint16_t 389me_in_cksum(uint16_t *p, int nwords) 390{ 391 uint32_t sum = 0; 392 393 while (nwords-- > 0) 394 sum += *p++; 395 sum = (sum >> 16) + (sum & 0xffff); 396 sum += (sum >> 16); 397 return (~sum); 398} 399 400int 401me_input(struct mbuf **mp, int *offp, int proto) 402{ 403 struct me_softc *sc; 404 struct mobhdr *mh; 405 struct ifnet *ifp; 406 struct mbuf *m; 407 struct ip *ip; 408 int hlen; 409 410 m = *mp; 411 sc = encap_getarg(m); 412 KASSERT(sc != NULL, ("encap_getarg returned NULL")); 413 414 ifp = ME2IFP(sc); 415 /* checks for short packets */ 416 hlen = sizeof(struct mobhdr); 417 if (m->m_pkthdr.len < sizeof(struct ip) + hlen) 418 hlen -= sizeof(struct in_addr); 419 if (m->m_len < sizeof(struct ip) + hlen) 420 m = m_pullup(m, sizeof(struct ip) + hlen); 421 if (m == NULL) 422 goto drop; 423 mh = (struct mobhdr *)mtodo(m, sizeof(struct ip)); 424 /* check for wrong flags */ 425 if (mh->mob_flags & (~MOB_FLAGS_SP)) { 426 m_freem(m); 427 goto drop; 428 } 429 if (mh->mob_flags) { 430 if (hlen != sizeof(struct mobhdr)) { 431 m_freem(m); 432 goto drop; 433 } 434 } else 435 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 436 /* check mobile header checksum */ 437 if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) { 438 m_freem(m); 439 goto drop; 440 } 441#ifdef MAC 442 mac_ifnet_create_mbuf(ifp, m); 443#endif 444 ip = mtod(m, struct ip *); 445 ip->ip_dst = mh->mob_dst; 446 ip->ip_p = mh->mob_proto; 447 ip->ip_sum = 0; 448 ip->ip_len = htons(m->m_pkthdr.len - hlen); 449 if (mh->mob_flags) 450 ip->ip_src = mh->mob_src; 451 memmove(mtodo(m, hlen), ip, sizeof(struct ip)); 452 m_adj(m, hlen); 453 m_clrprotoflags(m); 454 m->m_pkthdr.rcvif = ifp; 455 m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 456 M_SETFIB(m, sc->me_fibnum); 457 hlen = AF_INET; 458 BPF_MTAP2(ifp, &hlen, sizeof(hlen), m); 459 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 460 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 461 if ((ifp->if_flags & IFF_MONITOR) != 0) 462 m_freem(m); 463 else 464 netisr_dispatch(NETISR_IP, m); 465 return (IPPROTO_DONE); 466drop: 467 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 468 return (IPPROTO_DONE); 469} 470 471#define MTAG_ME 1414491977 472static int 473me_check_nesting(struct ifnet *ifp, struct mbuf *m) 474{ 475 struct m_tag *mtag; 476 int count; 477 478 count = 1; 479 mtag = NULL; 480 while ((mtag = m_tag_locate(m, MTAG_ME, 0, NULL)) != NULL) { 481 if (*(struct ifnet **)(mtag + 1) == ifp) { 482 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname); 483 return (EIO); 484 } 485 count++; 486 } 487 if (count > V_max_me_nesting) { 488 log(LOG_NOTICE, 489 "%s: if_output recursively called too many times(%d)\n", 490 ifp->if_xname, count); 491 return (EIO); 492 } 493 mtag = m_tag_alloc(MTAG_ME, 0, sizeof(struct ifnet *), M_NOWAIT); 494 if (mtag == NULL) 495 return (ENOMEM); 496 *(struct ifnet **)(mtag + 1) = ifp; 497 m_tag_prepend(m, mtag); 498 return (0); 499} 500 501static int 502me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 503 struct route *ro) 504{ 505 uint32_t af; 506 int error; 507 508#ifdef MAC 509 error = mac_ifnet_check_transmit(ifp, m); 510 if (error != 0) 511 goto drop; 512#endif 513 if ((ifp->if_flags & IFF_MONITOR) != 0 || 514 (ifp->if_flags & IFF_UP) == 0) { 515 error = ENETDOWN; 516 goto drop; 517 } 518 519 error = me_check_nesting(ifp, m); 520 if (error != 0) 521 goto drop; 522 523 m->m_flags &= ~(M_BCAST|M_MCAST); 524 if (dst->sa_family == AF_UNSPEC) 525 bcopy(dst->sa_data, &af, sizeof(af)); 526 else 527 af = dst->sa_family; 528 if (af != AF_INET) { 529 error = EAFNOSUPPORT; 530 goto drop; 531 } 532 BPF_MTAP2(ifp, &af, sizeof(af), m); 533 return (ifp->if_transmit(ifp, m)); 534drop: 535 m_freem(m); 536 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 537 return (error); 538} 539 540static int 541me_transmit(struct ifnet *ifp, struct mbuf *m) 542{ 543 ME_RLOCK_TRACKER; 544 struct mobhdr mh; 545 struct me_softc *sc; 546 struct ip *ip; 547 int error, hlen, plen; 548 549 sc = ifp->if_softc; 550 if (sc == NULL) { 551 error = ENETDOWN; 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 ME_RLOCK(sc); 572 if (!ME_READY(sc)) { 573 ME_RUNLOCK(sc); 574 error = ENETDOWN; 575 m_freem(m); 576 goto drop; 577 } 578 if (in_hosteq(sc->me_src, ip->ip_src)) { 579 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 580 mh.mob_flags = 0; 581 } else { 582 hlen = sizeof(struct mobhdr); 583 mh.mob_flags = MOB_FLAGS_SP; 584 } 585 plen = m->m_pkthdr.len; 586 ip->ip_src = sc->me_src; 587 ip->ip_dst = sc->me_dst; 588 M_SETFIB(m, sc->me_fibnum); 589 ME_RUNLOCK(sc); 590 M_PREPEND(m, hlen, M_NOWAIT); 591 if (m == NULL) { 592 error = ENOBUFS; 593 goto drop; 594 } 595 if (m->m_len < sizeof(struct ip) + hlen) 596 m = m_pullup(m, sizeof(struct ip) + hlen); 597 if (m == NULL) { 598 error = ENOBUFS; 599 goto drop; 600 } 601 memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip)); 602 ip = mtod(m, struct ip *); 603 ip->ip_len = htons(m->m_pkthdr.len); 604 ip->ip_p = IPPROTO_MOBILE; 605 ip->ip_sum = 0; 606 mh.mob_csum = 0; 607 mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t)); 608 bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen); 609 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 610drop: 611 if (error) 612 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 613 else { 614 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 615 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); 616 } 617 return (error); 618} 619 620static void 621me_qflush(struct ifnet *ifp __unused) 622{ 623 624} 625 626static int 627memodevent(module_t mod, int type, void *data) 628{ 629 630 switch (type) { 631 case MOD_LOAD: 632 case MOD_UNLOAD: 633 break; 634 default: 635 return (EOPNOTSUPP); 636 } 637 return (0); 638} 639 640static moduledata_t me_mod = { 641 "if_me", 642 memodevent, 643 0 644}; 645 646DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 647MODULE_VERSION(if_me, 1); 648