Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/net/if_me.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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: releng/10.3/sys/net/if_me.c 290347 2015-11-04 00:21:02Z hrs $"); 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 70 static const char mename[] = "me"; 71 static MALLOC_DEFINE(M_IFME, mename, "Minimal Encapsulation for IP"); 72 static VNET_DEFINE(struct mtx, me_mtx); 73 #define V_me_mtx VNET(me_mtx) 74 /* Minimal forwarding header RFC 2004 */ 75 struct 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 84 struct 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) 109 110 static VNET_DEFINE(LIST_HEAD(, me_softc), me_softc_list); 111 #define V_me_softc_list VNET(me_softc_list) 112 static struct sx me_ioctl_sx; 113 SX_SYSINIT(me_ioctl_sx, &me_ioctl_sx, "me_ioctl"); 114 115 static int me_clone_create(struct if_clone *, int, caddr_t); 116 static void me_clone_destroy(struct ifnet *); 117 static VNET_DEFINE(struct if_clone *, me_cloner); 118 #define V_me_cloner VNET(me_cloner) 119 120 static void me_qflush(struct ifnet *); 121 static int me_transmit(struct ifnet *, struct mbuf *); 122 static int me_ioctl(struct ifnet *, u_long, caddr_t); 123 static int me_output(struct ifnet *, struct mbuf *, 124 const struct sockaddr *, struct route *); 125 static int me_input(struct mbuf **, int *, int); 126 127 static int me_set_tunnel(struct ifnet *, struct sockaddr_in *, 128 struct sockaddr_in *); 129 static void me_delete_tunnel(struct ifnet *); 130 131 SYSCTL_DECL(_net_link); 132 static 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 137 138 static VNET_DEFINE(int, max_me_nesting) = MAX_ME_NEST; 139 #define V_max_me_nesting VNET(max_me_nesting) 140 SYSCTL_INT(_net_link_me, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET, 141 &VNET_NAME(max_me_nesting), 0, "Max nested tunnels"); 142 143 extern struct domain inetdomain; 144 static void me_input10(struct mbuf *, int); 145 static const struct protosw in_mobile_protosw = { 146 .pr_type = SOCK_RAW, 147 .pr_domain = &inetdomain, 148 .pr_protocol = IPPROTO_MOBILE, 149 .pr_flags = PR_ATOMIC|PR_ADDR, 150 .pr_input = me_input10, 151 .pr_output = (pr_output_t *)rip_output, 152 .pr_ctlinput = rip_ctlinput, 153 .pr_ctloutput = rip_ctloutput, 154 .pr_usrreqs = &rip_usrreqs 155 }; 156 157 static void 158 vnet_me_init(const void *unused __unused) 159 { 160 LIST_INIT(&V_me_softc_list); 161 ME_LIST_LOCK_INIT(); 162 V_me_cloner = if_clone_simple(mename, me_clone_create, 163 me_clone_destroy, 0); 164 } 165 VNET_SYSINIT(vnet_me_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 166 vnet_me_init, NULL); 167 168 static void 169 vnet_me_uninit(const void *unused __unused) 170 { 171 172 if_clone_detach(V_me_cloner); 173 ME_LIST_LOCK_DESTROY(); 174 } 175 VNET_SYSUNINIT(vnet_me_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, 176 vnet_me_uninit, NULL); 177 178 static int 179 me_clone_create(struct if_clone *ifc, int unit, caddr_t params) 180 { 181 struct me_softc *sc; 182 183 sc = malloc(sizeof(struct me_softc), M_IFME, M_WAITOK | M_ZERO); 184 sc->me_fibnum = curthread->td_proc->p_fibnum; 185 ME2IFP(sc) = if_alloc(IFT_TUNNEL); 186 ME_LOCK_INIT(sc); 187 ME2IFP(sc)->if_softc = sc; 188 if_initname(ME2IFP(sc), mename, unit); 189 190 ME2IFP(sc)->if_mtu = MEMTU - sizeof(struct mobhdr); 191 ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST; 192 ME2IFP(sc)->if_output = me_output; 193 ME2IFP(sc)->if_ioctl = me_ioctl; 194 ME2IFP(sc)->if_transmit = me_transmit; 195 ME2IFP(sc)->if_qflush = me_qflush; 196 ME2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE; 197 ME2IFP(sc)->if_capenable |= IFCAP_LINKSTATE; 198 if_attach(ME2IFP(sc)); 199 bpfattach(ME2IFP(sc), DLT_NULL, sizeof(u_int32_t)); 200 ME_LIST_LOCK(); 201 LIST_INSERT_HEAD(&V_me_softc_list, sc, me_list); 202 ME_LIST_UNLOCK(); 203 return (0); 204 } 205 206 static void 207 me_clone_destroy(struct ifnet *ifp) 208 { 209 struct me_softc *sc; 210 211 sx_xlock(&me_ioctl_sx); 212 sc = ifp->if_softc; 213 me_delete_tunnel(ifp); 214 ME_LIST_LOCK(); 215 LIST_REMOVE(sc, me_list); 216 ME_LIST_UNLOCK(); 217 bpfdetach(ifp); 218 if_detach(ifp); 219 ifp->if_softc = NULL; 220 sx_xunlock(&me_ioctl_sx); 221 222 if_free(ifp); 223 ME_LOCK_DESTROY(sc); 224 free(sc, M_IFME); 225 } 226 227 static int 228 me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 229 { 230 ME_RLOCK_TRACKER; 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 - sizeof(struct mobhdr); 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 sockaddr_in *) 259 &(((struct in_aliasreq *)data)->ifra_addr); 260 dst = (struct sockaddr_in *) 261 &(((struct in_aliasreq *)data)->ifra_dstaddr); 262 if (src->sin_family != dst->sin_family || 263 src->sin_family != AF_INET || 264 src->sin_len != dst->sin_len || 265 src->sin_len != sizeof(struct sockaddr_in)) { 266 error = EINVAL; 267 break; 268 } 269 if (src->sin_addr.s_addr == INADDR_ANY || 270 dst->sin_addr.s_addr == INADDR_ANY) { 271 error = EADDRNOTAVAIL; 272 break; 273 } 274 error = me_set_tunnel(ifp, src, dst); 275 break; 276 case SIOCDIFPHYADDR: 277 me_delete_tunnel(ifp); 278 break; 279 case SIOCGIFPSRCADDR: 280 case SIOCGIFPDSTADDR: 281 ME_RLOCK(sc); 282 if (!ME_READY(sc)) { 283 error = EADDRNOTAVAIL; 284 ME_RUNLOCK(sc); 285 break; 286 } 287 src = (struct sockaddr_in *)&ifr->ifr_addr; 288 memset(src, 0, sizeof(*src)); 289 src->sin_family = AF_INET; 290 src->sin_len = sizeof(*src); 291 switch (cmd) { 292 case SIOCGIFPSRCADDR: 293 src->sin_addr = sc->me_src; 294 break; 295 case SIOCGIFPDSTADDR: 296 src->sin_addr = sc->me_dst; 297 break; 298 } 299 ME_RUNLOCK(sc); 300 error = prison_if(curthread->td_ucred, sintosa(src)); 301 if (error != 0) 302 memset(src, 0, sizeof(*src)); 303 break; 304 case SIOCGTUNFIB: 305 ifr->ifr_fib = sc->me_fibnum; 306 break; 307 case SIOCSTUNFIB: 308 if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0) 309 break; 310 if (ifr->ifr_fib >= rt_numfibs) 311 error = EINVAL; 312 else 313 sc->me_fibnum = ifr->ifr_fib; 314 break; 315 default: 316 error = EINVAL; 317 break; 318 } 319 end: 320 sx_xunlock(&me_ioctl_sx); 321 return (error); 322 } 323 324 static int 325 me_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 326 { 327 ME_RLOCK_TRACKER; 328 struct me_softc *sc; 329 struct ip *ip; 330 int ret; 331 332 sc = (struct me_softc *)arg; 333 if ((ME2IFP(sc)->if_flags & IFF_UP) == 0) 334 return (0); 335 336 M_ASSERTPKTHDR(m); 337 338 if (m->m_pkthdr.len < sizeof(struct ip) + sizeof(struct mobhdr) - 339 sizeof(struct in_addr)) 340 return (0); 341 342 ret = 0; 343 ME_RLOCK(sc); 344 if (ME_READY(sc)) { 345 ip = mtod(m, struct ip *); 346 if (sc->me_src.s_addr == ip->ip_dst.s_addr && 347 sc->me_dst.s_addr == ip->ip_src.s_addr) 348 ret = 32 * 2; 349 } 350 ME_RUNLOCK(sc); 351 return (ret); 352 } 353 354 static int 355 me_set_tunnel(struct ifnet *ifp, struct sockaddr_in *src, 356 struct sockaddr_in *dst) 357 { 358 struct me_softc *sc, *tsc; 359 360 sx_assert(&me_ioctl_sx, SA_XLOCKED); 361 ME_LIST_LOCK(); 362 sc = ifp->if_softc; 363 LIST_FOREACH(tsc, &V_me_softc_list, me_list) { 364 if (tsc == sc || !ME_READY(tsc)) 365 continue; 366 if (tsc->me_src.s_addr == src->sin_addr.s_addr && 367 tsc->me_dst.s_addr == dst->sin_addr.s_addr) { 368 ME_LIST_UNLOCK(); 369 return (EADDRNOTAVAIL); 370 } 371 } 372 ME_LIST_UNLOCK(); 373 374 ME_WLOCK(sc); 375 sc->me_dst = dst->sin_addr; 376 sc->me_src = src->sin_addr; 377 ME_WUNLOCK(sc); 378 379 if (sc->me_ecookie == NULL) 380 sc->me_ecookie = encap_attach_func(AF_INET, IPPROTO_MOBILE, 381 me_encapcheck, &in_mobile_protosw, sc); 382 if (sc->me_ecookie != NULL) { 383 ifp->if_drv_flags |= IFF_DRV_RUNNING; 384 if_link_state_change(ifp, LINK_STATE_UP); 385 } 386 return (0); 387 } 388 389 static void 390 me_delete_tunnel(struct ifnet *ifp) 391 { 392 struct me_softc *sc = ifp->if_softc; 393 394 sx_assert(&me_ioctl_sx, SA_XLOCKED); 395 if (sc->me_ecookie != NULL) 396 encap_detach(sc->me_ecookie); 397 sc->me_ecookie = NULL; 398 ME_WLOCK(sc); 399 sc->me_src.s_addr = 0; 400 sc->me_dst.s_addr = 0; 401 ME_WUNLOCK(sc); 402 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 403 if_link_state_change(ifp, LINK_STATE_DOWN); 404 } 405 406 static uint16_t 407 me_in_cksum(uint16_t *p, int nwords) 408 { 409 uint32_t sum = 0; 410 411 while (nwords-- > 0) 412 sum += *p++; 413 sum = (sum >> 16) + (sum & 0xffff); 414 sum += (sum >> 16); 415 return (~sum); 416 } 417 418 static void 419 me_input10(struct mbuf *m, int off) 420 { 421 int proto; 422 423 proto = (mtod(m, struct ip *))->ip_p; 424 me_input(&m, &off, proto); 425 } 426 427 int 428 me_input(struct mbuf **mp, int *offp, int proto) 429 { 430 struct me_softc *sc; 431 struct mobhdr *mh; 432 struct ifnet *ifp; 433 struct mbuf *m; 434 struct ip *ip; 435 int hlen; 436 437 m = *mp; 438 sc = encap_getarg(m); 439 KASSERT(sc != NULL, ("encap_getarg returned NULL")); 440 441 ifp = ME2IFP(sc); 442 /* checks for short packets */ 443 hlen = sizeof(struct mobhdr); 444 if (m->m_pkthdr.len < sizeof(struct ip) + hlen) 445 hlen -= sizeof(struct in_addr); 446 if (m->m_len < sizeof(struct ip) + hlen) 447 m = m_pullup(m, sizeof(struct ip) + hlen); 448 if (m == NULL) 449 goto drop; 450 mh = (struct mobhdr *)mtodo(m, sizeof(struct ip)); 451 /* check for wrong flags */ 452 if (mh->mob_flags & (~MOB_FLAGS_SP)) { 453 m_freem(m); 454 goto drop; 455 } 456 if (mh->mob_flags) { 457 if (hlen != sizeof(struct mobhdr)) { 458 m_freem(m); 459 goto drop; 460 } 461 } else 462 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 463 /* check mobile header checksum */ 464 if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) { 465 m_freem(m); 466 goto drop; 467 } 468 #ifdef MAC 469 mac_ifnet_create_mbuf(ifp, m); 470 #endif 471 ip = mtod(m, struct ip *); 472 ip->ip_dst = mh->mob_dst; 473 ip->ip_p = mh->mob_proto; 474 ip->ip_sum = 0; 475 ip->ip_len = htons(m->m_pkthdr.len - hlen); 476 if (mh->mob_flags) 477 ip->ip_src = mh->mob_src; 478 memmove(mtodo(m, hlen), ip, sizeof(struct ip)); 479 m_adj(m, hlen); 480 m_clrprotoflags(m); 481 m->m_pkthdr.rcvif = ifp; 482 m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID); 483 M_SETFIB(m, ifp->if_fib); 484 hlen = AF_INET; 485 BPF_MTAP2(ifp, &hlen, sizeof(hlen), m); 486 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); 487 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); 488 if ((ifp->if_flags & IFF_MONITOR) != 0) 489 m_freem(m); 490 else 491 netisr_dispatch(NETISR_IP, m); 492 return (IPPROTO_DONE); 493 drop: 494 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1); 495 return (IPPROTO_DONE); 496 } 497 498 #define MTAG_ME 1414491977 499 static int 500 me_check_nesting(struct ifnet *ifp, struct mbuf *m) 501 { 502 struct m_tag *mtag; 503 int count; 504 505 count = 1; 506 mtag = NULL; 507 while ((mtag = m_tag_locate(m, MTAG_ME, 0, mtag)) != NULL) { 508 if (*(struct ifnet **)(mtag + 1) == ifp) { 509 log(LOG_NOTICE, "%s: loop detected\n", ifp->if_xname); 510 return (EIO); 511 } 512 count++; 513 } 514 if (count > V_max_me_nesting) { 515 log(LOG_NOTICE, 516 "%s: if_output recursively called too many times(%d)\n", 517 ifp->if_xname, count); 518 return (EIO); 519 } 520 mtag = m_tag_alloc(MTAG_ME, 0, sizeof(struct ifnet *), M_NOWAIT); 521 if (mtag == NULL) 522 return (ENOMEM); 523 *(struct ifnet **)(mtag + 1) = ifp; 524 m_tag_prepend(m, mtag); 525 return (0); 526 } 527 528 static int 529 me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 530 struct route *ro) 531 { 532 uint32_t af; 533 int error; 534 535 #ifdef MAC 536 error = mac_ifnet_check_transmit(ifp, m); 537 if (error != 0) 538 goto drop; 539 #endif 540 if ((ifp->if_flags & IFF_MONITOR) != 0 || 541 (ifp->if_flags & IFF_UP) == 0) { 542 error = ENETDOWN; 543 goto drop; 544 } 545 546 error = me_check_nesting(ifp, m); 547 if (error != 0) 548 goto drop; 549 550 m->m_flags &= ~(M_BCAST|M_MCAST); 551 if (dst->sa_family == AF_UNSPEC) 552 bcopy(dst->sa_data, &af, sizeof(af)); 553 else 554 af = dst->sa_family; 555 if (af != AF_INET) { 556 error = EAFNOSUPPORT; 557 goto drop; 558 } 559 BPF_MTAP2(ifp, &af, sizeof(af), m); 560 return (ifp->if_transmit(ifp, m)); 561 drop: 562 m_freem(m); 563 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 564 return (error); 565 } 566 567 static int 568 me_transmit(struct ifnet *ifp, struct mbuf *m) 569 { 570 ME_RLOCK_TRACKER; 571 struct mobhdr mh; 572 struct me_softc *sc; 573 struct ip *ip; 574 int error, hlen, plen; 575 576 sc = ifp->if_softc; 577 if (sc == NULL) { 578 error = ENETDOWN; 579 m_freem(m); 580 goto drop; 581 } 582 if (m->m_len < sizeof(struct ip)) 583 m = m_pullup(m, sizeof(struct ip)); 584 if (m == NULL) { 585 error = ENOBUFS; 586 goto drop; 587 } 588 ip = mtod(m, struct ip *); 589 /* Fragmented datagramms shouldn't be encapsulated */ 590 if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) { 591 error = EINVAL; 592 m_freem(m); 593 goto drop; 594 } 595 mh.mob_proto = ip->ip_p; 596 mh.mob_src = ip->ip_src; 597 mh.mob_dst = ip->ip_dst; 598 ME_RLOCK(sc); 599 if (!ME_READY(sc)) { 600 ME_RUNLOCK(sc); 601 error = ENETDOWN; 602 m_freem(m); 603 goto drop; 604 } 605 if (in_hosteq(sc->me_src, ip->ip_src)) { 606 hlen = sizeof(struct mobhdr) - sizeof(struct in_addr); 607 mh.mob_flags = 0; 608 } else { 609 hlen = sizeof(struct mobhdr); 610 mh.mob_flags = MOB_FLAGS_SP; 611 } 612 plen = m->m_pkthdr.len; 613 ip->ip_src = sc->me_src; 614 ip->ip_dst = sc->me_dst; 615 M_SETFIB(m, sc->me_fibnum); 616 ME_RUNLOCK(sc); 617 M_PREPEND(m, hlen, M_NOWAIT); 618 if (m == NULL) { 619 error = ENOBUFS; 620 goto drop; 621 } 622 if (m->m_len < sizeof(struct ip) + hlen) 623 m = m_pullup(m, sizeof(struct ip) + hlen); 624 if (m == NULL) { 625 error = ENOBUFS; 626 goto drop; 627 } 628 memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip)); 629 ip = mtod(m, struct ip *); 630 ip->ip_len = htons(m->m_pkthdr.len); 631 ip->ip_p = IPPROTO_MOBILE; 632 ip->ip_sum = 0; 633 mh.mob_csum = 0; 634 mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t)); 635 bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen); 636 error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 637 drop: 638 if (error) 639 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 640 else { 641 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 642 if_inc_counter(ifp, IFCOUNTER_OBYTES, plen); 643 } 644 return (error); 645 } 646 647 static void 648 me_qflush(struct ifnet *ifp __unused) 649 { 650 651 } 652 653 static int 654 memodevent(module_t mod, int type, void *data) 655 { 656 657 switch (type) { 658 case MOD_LOAD: 659 case MOD_UNLOAD: 660 break; 661 default: 662 return (EOPNOTSUPP); 663 } 664 return (0); 665 } 666 667 static moduledata_t me_mod = { 668 "if_me", 669 memodevent, 670 0 671 }; 672 673 DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 674 MODULE_VERSION(if_me, 1);
Cache object: f8c0ccba4acffc9ef1ab029ab42a8c4d
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]