1 /* $NetBSD: if_arp.c,v 1.210 2016/05/17 09:00:24 ozaki-r Exp $ */ 2 3 /*- 4 * Copyright (c) 1998, 2000, 2008 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Public Access Networks Corporation ("Panix"). It was developed under 9 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1982, 1986, 1988, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)if_ether.c 8.2 (Berkeley) 9/26/94 62 */ 63 64 /* 65 * Ethernet address resolution protocol. 66 * TODO: 67 * add "inuse/lock" bit (or ref. count) along with valid bit 68 */ 69 70 #include <sys/cdefs.h> 71 __KERNEL_RCSID(0, "$NetBSD: if_arp.c,v 1.210 2016/05/17 09:00:24 ozaki-r Exp $"); 72 73 #ifdef _KERNEL_OPT 74 #include "opt_ddb.h" 75 #include "opt_inet.h" 76 #endif 77 78 #ifdef INET 79 80 #include "bridge.h" 81 82 #include <sys/param.h> 83 #include <sys/systm.h> 84 #include <sys/callout.h> 85 #include <sys/malloc.h> 86 #include <sys/mbuf.h> 87 #include <sys/socket.h> 88 #include <sys/time.h> 89 #include <sys/timetc.h> 90 #include <sys/kernel.h> 91 #include <sys/errno.h> 92 #include <sys/ioctl.h> 93 #include <sys/syslog.h> 94 #include <sys/proc.h> 95 #include <sys/protosw.h> 96 #include <sys/domain.h> 97 #include <sys/sysctl.h> 98 #include <sys/socketvar.h> 99 #include <sys/percpu.h> 100 #include <sys/cprng.h> 101 #include <sys/kmem.h> 102 103 #include <net/ethertypes.h> 104 #include <net/if.h> 105 #include <net/if_dl.h> 106 #include <net/if_token.h> 107 #include <net/if_types.h> 108 #include <net/if_ether.h> 109 #include <net/if_llatbl.h> 110 #include <net/net_osdep.h> 111 #include <net/route.h> 112 #include <net/net_stats.h> 113 114 #include <netinet/in.h> 115 #include <netinet/in_systm.h> 116 #include <netinet/in_var.h> 117 #include <netinet/ip.h> 118 #include <netinet/if_inarp.h> 119 120 #include "arcnet.h" 121 #if NARCNET > 0 122 #include <net/if_arc.h> 123 #endif 124 #include "fddi.h" 125 #if NFDDI > 0 126 #include <net/if_fddi.h> 127 #endif 128 #include "token.h" 129 #include "carp.h" 130 #if NCARP > 0 131 #include <netinet/ip_carp.h> 132 #endif 133 134 #define SIN(s) ((struct sockaddr_in *)s) 135 #define SRP(s) ((struct sockaddr_inarp *)s) 136 137 /* 138 * ARP trailer negotiation. Trailer protocol is not IP specific, 139 * but ARP request/response use IP addresses. 140 */ 141 #define ETHERTYPE_IPTRAILERS ETHERTYPE_TRAIL 142 143 /* timer values */ 144 static int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */ 145 static int arpt_down = 20; /* once declared down, don't send for 20 secs */ 146 static int arp_maxhold = 1; /* number of packets to hold per ARP entry */ 147 #define rt_expire rt_rmx.rmx_expire 148 #define rt_pksent rt_rmx.rmx_pksent 149 150 int ip_dad_count = PROBE_NUM; 151 #ifdef ARP_DEBUG 152 static int arp_debug = 1; 153 #else 154 static int arp_debug = 0; 155 #endif 156 #define arplog(x) do { if (arp_debug) log x; } while (/*CONSTCOND*/ 0) 157 158 static void arp_init(void); 159 160 static struct sockaddr *arp_setgate(struct rtentry *, struct sockaddr *, 161 const struct sockaddr *); 162 static void arptimer(void *); 163 static void arp_settimer(struct llentry *, int); 164 static struct llentry *arplookup(struct ifnet *, struct mbuf *, 165 const struct in_addr *, const struct sockaddr *, int); 166 static struct llentry *arpcreate(struct ifnet *, struct mbuf *, 167 const struct in_addr *, const struct sockaddr *, int); 168 static void in_arpinput(struct mbuf *); 169 static void in_revarpinput(struct mbuf *); 170 static void revarprequest(struct ifnet *); 171 172 static void arp_drainstub(void); 173 174 static void arp_dad_timer(struct ifaddr *); 175 static void arp_dad_start(struct ifaddr *); 176 static void arp_dad_stop(struct ifaddr *); 177 static void arp_dad_duplicated(struct ifaddr *); 178 179 static void arp_init_llentry(struct ifnet *, struct llentry *); 180 #if NTOKEN > 0 181 static void arp_free_llentry_tokenring(struct llentry *); 182 #endif 183 184 struct ifqueue arpintrq = { 185 .ifq_head = NULL, 186 .ifq_tail = NULL, 187 .ifq_len = 0, 188 .ifq_maxlen = 50, 189 .ifq_drops = 0, 190 }; 191 static int arp_maxtries = 5; 192 static int useloopback = 1; /* use loopback interface for local traffic */ 193 194 static percpu_t *arpstat_percpu; 195 196 #define ARP_STAT_GETREF() _NET_STAT_GETREF(arpstat_percpu) 197 #define ARP_STAT_PUTREF() _NET_STAT_PUTREF(arpstat_percpu) 198 199 #define ARP_STATINC(x) _NET_STATINC(arpstat_percpu, x) 200 #define ARP_STATADD(x, v) _NET_STATADD(arpstat_percpu, x, v) 201 202 /* revarp state */ 203 static struct in_addr myip, srv_ip; 204 static int myip_initialized = 0; 205 static int revarp_in_progress = 0; 206 static struct ifnet *myip_ifp = NULL; 207 208 static int arp_drainwanted; 209 210 static int log_movements = 1; 211 static int log_permanent_modify = 1; 212 static int log_wrong_iface = 1; 213 static int log_unknown_network = 1; 214 215 /* 216 * this should be elsewhere. 217 */ 218 219 static char * 220 lla_snprintf(u_int8_t *, int); 221 222 static char * 223 lla_snprintf(u_int8_t *adrp, int len) 224 { 225 #define NUMBUFS 3 226 static char buf[NUMBUFS][16*3]; 227 static int bnum = 0; 228 229 int i; 230 char *p; 231 232 p = buf[bnum]; 233 234 *p++ = hexdigits[(*adrp)>>4]; 235 *p++ = hexdigits[(*adrp++)&0xf]; 236 237 for (i=1; i<len && i<16; i++) { 238 *p++ = ':'; 239 *p++ = hexdigits[(*adrp)>>4]; 240 *p++ = hexdigits[(*adrp++)&0xf]; 241 } 242 243 *p = 0; 244 p = buf[bnum]; 245 bnum = (bnum + 1) % NUMBUFS; 246 return p; 247 } 248 249 DOMAIN_DEFINE(arpdomain); /* forward declare and add to link set */ 250 251 static void 252 arp_fasttimo(void) 253 { 254 if (arp_drainwanted) { 255 arp_drain(); 256 arp_drainwanted = 0; 257 } 258 } 259 260 const struct protosw arpsw[] = { 261 { .pr_type = 0, 262 .pr_domain = &arpdomain, 263 .pr_protocol = 0, 264 .pr_flags = 0, 265 .pr_input = 0, 266 .pr_ctlinput = 0, 267 .pr_ctloutput = 0, 268 .pr_usrreqs = 0, 269 .pr_init = arp_init, 270 .pr_fasttimo = arp_fasttimo, 271 .pr_slowtimo = 0, 272 .pr_drain = arp_drainstub, 273 } 274 }; 275 276 struct domain arpdomain = { 277 .dom_family = PF_ARP, 278 .dom_name = "arp", 279 .dom_protosw = arpsw, 280 .dom_protoswNPROTOSW = &arpsw[__arraycount(arpsw)], 281 }; 282 283 static void sysctl_net_inet_arp_setup(struct sysctllog **); 284 285 void 286 arp_init(void) 287 { 288 289 sysctl_net_inet_arp_setup(NULL); 290 arpstat_percpu = percpu_alloc(sizeof(uint64_t) * ARP_NSTATS); 291 } 292 293 static void 294 arp_drainstub(void) 295 { 296 arp_drainwanted = 1; 297 } 298 299 /* 300 * ARP protocol drain routine. Called when memory is in short supply. 301 * Called at splvm(); don't acquire softnet_lock as can be called from 302 * hardware interrupt handlers. 303 */ 304 void 305 arp_drain(void) 306 { 307 308 lltable_drain(AF_INET); 309 } 310 311 static void 312 arptimer(void *arg) 313 { 314 struct llentry *lle = arg; 315 struct ifnet *ifp; 316 317 if (lle == NULL) 318 return; 319 320 if (lle->la_flags & LLE_STATIC) 321 return; 322 323 LLE_WLOCK(lle); 324 if (callout_pending(&lle->la_timer)) { 325 /* 326 * Here we are a bit odd here in the treatment of 327 * active/pending. If the pending bit is set, it got 328 * rescheduled before I ran. The active 329 * bit we ignore, since if it was stopped 330 * in ll_tablefree() and was currently running 331 * it would have return 0 so the code would 332 * not have deleted it since the callout could 333 * not be stopped so we want to go through 334 * with the delete here now. If the callout 335 * was restarted, the pending bit will be back on and 336 * we just want to bail since the callout_reset would 337 * return 1 and our reference would have been removed 338 * by arpresolve() below. 339 */ 340 LLE_WUNLOCK(lle); 341 return; 342 } 343 ifp = lle->lle_tbl->llt_ifp; 344 345 callout_stop(&lle->la_timer); 346 347 /* XXX: LOR avoidance. We still have ref on lle. */ 348 LLE_WUNLOCK(lle); 349 350 IF_AFDATA_LOCK(ifp); 351 LLE_WLOCK(lle); 352 353 /* Guard against race with other llentry_free(). */ 354 if (lle->la_flags & LLE_LINKED) { 355 size_t pkts_dropped; 356 357 LLE_REMREF(lle); 358 pkts_dropped = llentry_free(lle); 359 ARP_STATADD(ARP_STAT_DFRDROPPED, pkts_dropped); 360 } else { 361 LLE_FREE_LOCKED(lle); 362 } 363 364 IF_AFDATA_UNLOCK(ifp); 365 } 366 367 static void 368 arp_settimer(struct llentry *la, int sec) 369 { 370 371 LLE_WLOCK_ASSERT(la); 372 LLE_ADDREF(la); 373 callout_reset(&la->la_timer, hz * sec, arptimer, la); 374 } 375 376 /* 377 * We set the gateway for RTF_CLONING routes to a "prototype" 378 * link-layer sockaddr whose interface type (if_type) and interface 379 * index (if_index) fields are prepared. 380 */ 381 static struct sockaddr * 382 arp_setgate(struct rtentry *rt, struct sockaddr *gate, 383 const struct sockaddr *netmask) 384 { 385 const struct ifnet *ifp = rt->rt_ifp; 386 uint8_t namelen = strlen(ifp->if_xname); 387 uint8_t addrlen = ifp->if_addrlen; 388 389 /* 390 * XXX: If this is a manually added route to interface 391 * such as older version of routed or gated might provide, 392 * restore cloning bit. 393 */ 394 if ((rt->rt_flags & RTF_HOST) == 0 && netmask != NULL && 395 satocsin(netmask)->sin_addr.s_addr != 0xffffffff) 396 rt->rt_flags |= RTF_CONNECTED; 397 398 if ((rt->rt_flags & (RTF_CONNECTED | RTF_LOCAL))) { 399 union { 400 struct sockaddr sa; 401 struct sockaddr_storage ss; 402 struct sockaddr_dl sdl; 403 } u; 404 /* 405 * Case 1: This route should come from a route to iface. 406 */ 407 sockaddr_dl_init(&u.sdl, sizeof(u.ss), 408 ifp->if_index, ifp->if_type, NULL, namelen, NULL, addrlen); 409 rt_setgate(rt, &u.sa); 410 gate = rt->rt_gateway; 411 } 412 return gate; 413 } 414 415 static void 416 arp_init_llentry(struct ifnet *ifp, struct llentry *lle) 417 { 418 419 switch (ifp->if_type) { 420 #if NTOKEN > 0 421 case IFT_ISO88025: 422 lle->la_opaque = kmem_intr_alloc(sizeof(struct token_rif), 423 KM_NOSLEEP); 424 lle->lle_ll_free = arp_free_llentry_tokenring; 425 break; 426 #endif 427 } 428 } 429 430 #if NTOKEN > 0 431 static void 432 arp_free_llentry_tokenring(struct llentry *lle) 433 { 434 435 kmem_intr_free(lle->la_opaque, sizeof(struct token_rif)); 436 } 437 #endif 438 439 /* 440 * Parallel to llc_rtrequest. 441 */ 442 void 443 arp_rtrequest(int req, struct rtentry *rt, const struct rt_addrinfo *info) 444 { 445 struct sockaddr *gate = rt->rt_gateway; 446 struct in_ifaddr *ia; 447 struct ifaddr *ifa; 448 struct ifnet *ifp = rt->rt_ifp; 449 450 if (req == RTM_LLINFO_UPD) { 451 struct in_addr *in; 452 453 if ((ifa = info->rti_ifa) == NULL) 454 return; 455 456 in = &ifatoia(ifa)->ia_addr.sin_addr; 457 458 if (ifatoia(ifa)->ia4_flags & 459 (IN_IFF_NOTREADY | IN_IFF_DETACHED)) 460 { 461 arplog((LOG_DEBUG, "arp_request: %s not ready\n", 462 in_fmtaddr(*in))); 463 return; 464 } 465 466 arprequest(ifa->ifa_ifp, in, in, 467 CLLADDR(ifa->ifa_ifp->if_sadl)); 468 return; 469 } 470 471 if ((rt->rt_flags & RTF_GATEWAY) != 0) { 472 if (req != RTM_ADD) 473 return; 474 475 /* 476 * linklayers with particular link MTU limitation. 477 */ 478 switch(ifp->if_type) { 479 #if NFDDI > 0 480 case IFT_FDDI: 481 if (ifp->if_mtu > FDDIIPMTU) 482 rt->rt_rmx.rmx_mtu = FDDIIPMTU; 483 break; 484 #endif 485 #if NARCNET > 0 486 case IFT_ARCNET: 487 { 488 int arcipifmtu; 489 490 if (ifp->if_flags & IFF_LINK0) 491 arcipifmtu = arc_ipmtu; 492 else 493 arcipifmtu = ARCMTU; 494 if (ifp->if_mtu > arcipifmtu) 495 rt->rt_rmx.rmx_mtu = arcipifmtu; 496 break; 497 } 498 #endif 499 } 500 return; 501 } 502 503 switch (req) { 504 case RTM_SETGATE: 505 gate = arp_setgate(rt, gate, info->rti_info[RTAX_NETMASK]); 506 break; 507 case RTM_ADD: 508 gate = arp_setgate(rt, gate, info->rti_info[RTAX_NETMASK]); 509 if (gate == NULL) { 510 log(LOG_ERR, "%s: arp_setgate failed\n", __func__); 511 break; 512 } 513 if ((rt->rt_flags & RTF_CONNECTED) || 514 (rt->rt_flags & RTF_LOCAL)) { 515 /* 516 * Give this route an expiration time, even though 517 * it's a "permanent" route, so that routes cloned 518 * from it do not need their expiration time set. 519 */ 520 KASSERT(time_uptime != 0); 521 rt->rt_expire = time_uptime; 522 /* 523 * linklayers with particular link MTU limitation. 524 */ 525 switch (ifp->if_type) { 526 #if NFDDI > 0 527 case IFT_FDDI: 528 if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0 && 529 (rt->rt_rmx.rmx_mtu > FDDIIPMTU || 530 (rt->rt_rmx.rmx_mtu == 0 && 531 ifp->if_mtu > FDDIIPMTU))) 532 rt->rt_rmx.rmx_mtu = FDDIIPMTU; 533 break; 534 #endif 535 #if NARCNET > 0 536 case IFT_ARCNET: 537 { 538 int arcipifmtu; 539 if (ifp->if_flags & IFF_LINK0) 540 arcipifmtu = arc_ipmtu; 541 else 542 arcipifmtu = ARCMTU; 543 544 if ((rt->rt_rmx.rmx_locks & RTV_MTU) == 0 && 545 (rt->rt_rmx.rmx_mtu > arcipifmtu || 546 (rt->rt_rmx.rmx_mtu == 0 && 547 ifp->if_mtu > arcipifmtu))) 548 rt->rt_rmx.rmx_mtu = arcipifmtu; 549 break; 550 } 551 #endif 552 } 553 if (rt->rt_flags & RTF_CONNECTED) 554 break; 555 } 556 /* Announce a new entry if requested. */ 557 if (rt->rt_flags & RTF_ANNOUNCE) { 558 INADDR_TO_IA(satocsin(rt_getkey(rt))->sin_addr, ia); 559 while (ia && ia->ia_ifp != ifp) 560 NEXT_IA_WITH_SAME_ADDR(ia); 561 if (ia == NULL || 562 ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED)) 563 ; 564 else 565 arprequest(ifp, 566 &satocsin(rt_getkey(rt))->sin_addr, 567 &satocsin(rt_getkey(rt))->sin_addr, 568 CLLADDR(satocsdl(gate))); 569 } 570 571 if (gate->sa_family != AF_LINK || 572 gate->sa_len < sockaddr_dl_measure(0, ifp->if_addrlen)) { 573 log(LOG_DEBUG, "%s: bad gateway value\n", __func__); 574 break; 575 } 576 577 satosdl(gate)->sdl_type = ifp->if_type; 578 satosdl(gate)->sdl_index = ifp->if_index; 579 580 /* If the route is for a broadcast address mark it as such. 581 * This way we can avoid an expensive call to in_broadcast() 582 * in ip_output() most of the time (because the route passed 583 * to ip_output() is almost always a host route). */ 584 if (rt->rt_flags & RTF_HOST && 585 !(rt->rt_flags & RTF_BROADCAST) && 586 in_broadcast(satocsin(rt_getkey(rt))->sin_addr, rt->rt_ifp)) 587 rt->rt_flags |= RTF_BROADCAST; 588 /* There is little point in resolving the broadcast address */ 589 if (rt->rt_flags & RTF_BROADCAST) 590 break; 591 592 INADDR_TO_IA(satocsin(rt_getkey(rt))->sin_addr, ia); 593 while (ia && ia->ia_ifp != ifp) 594 NEXT_IA_WITH_SAME_ADDR(ia); 595 596 if (ia == NULL) 597 break; 598 599 rt->rt_expire = 0; 600 if (useloopback) { 601 rt->rt_ifp = lo0ifp; 602 rt->rt_rmx.rmx_mtu = 0; 603 } 604 rt->rt_flags |= RTF_LOCAL; 605 /* 606 * make sure to set rt->rt_ifa to the interface 607 * address we are using, otherwise we will have trouble 608 * with source address selection. 609 */ 610 ifa = &ia->ia_ifa; 611 if (ifa != rt->rt_ifa) 612 rt_replace_ifa(rt, ifa); 613 break; 614 } 615 } 616 617 /* 618 * Broadcast an ARP request. Caller specifies: 619 * - arp header source ip address 620 * - arp header target ip address 621 * - arp header source ethernet address 622 */ 623 void 624 arprequest(struct ifnet *ifp, 625 const struct in_addr *sip, const struct in_addr *tip, 626 const u_int8_t *enaddr) 627 { 628 struct mbuf *m; 629 struct arphdr *ah; 630 struct sockaddr sa; 631 uint64_t *arps; 632 633 KASSERT(sip != NULL); 634 KASSERT(tip != NULL); 635 KASSERT(enaddr != NULL); 636 637 if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) 638 return; 639 MCLAIM(m, &arpdomain.dom_mowner); 640 switch (ifp->if_type) { 641 case IFT_IEEE1394: 642 m->m_len = sizeof(*ah) + 2 * sizeof(struct in_addr) + 643 ifp->if_addrlen; 644 break; 645 default: 646 m->m_len = sizeof(*ah) + 2 * sizeof(struct in_addr) + 647 2 * ifp->if_addrlen; 648 break; 649 } 650 m->m_pkthdr.len = m->m_len; 651 MH_ALIGN(m, m->m_len); 652 ah = mtod(m, struct arphdr *); 653 memset(ah, 0, m->m_len); 654 switch (ifp->if_type) { 655 case IFT_IEEE1394: /* RFC2734 */ 656 /* fill it now for ar_tpa computation */ 657 ah->ar_hrd = htons(ARPHRD_IEEE1394); 658 break; 659 default: 660 /* ifp->if_output will fill ar_hrd */ 661 break; 662 } 663 ah->ar_pro = htons(ETHERTYPE_IP); 664 ah->ar_hln = ifp->if_addrlen; /* hardware address length */ 665 ah->ar_pln = sizeof(struct in_addr); /* protocol address length */ 666 ah->ar_op = htons(ARPOP_REQUEST); 667 memcpy(ar_sha(ah), enaddr, ah->ar_hln); 668 memcpy(ar_spa(ah), sip, ah->ar_pln); 669 memcpy(ar_tpa(ah), tip, ah->ar_pln); 670 sa.sa_family = AF_ARP; 671 sa.sa_len = 2; 672 m->m_flags |= M_BCAST; 673 arps = ARP_STAT_GETREF(); 674 arps[ARP_STAT_SNDTOTAL]++; 675 arps[ARP_STAT_SENDREQUEST]++; 676 ARP_STAT_PUTREF(); 677 (*ifp->if_output)(ifp, m, &sa, NULL); 678 } 679 680 /* 681 * Resolve an IP address into an ethernet address. If success, 682 * desten is filled in. If there is no entry in arptab, 683 * set one up and broadcast a request for the IP address. 684 * Hold onto this mbuf and resend it once the address 685 * is finally resolved. A return value of 0 indicates 686 * that desten has been filled in and the packet should be sent 687 * normally; a return value of EWOULDBLOCK indicates that the packet has been 688 * held pending resolution. 689 * Any other value indicates an error. 690 */ 691 int 692 arpresolve(struct ifnet *ifp, const struct rtentry *rt, struct mbuf *m, 693 const struct sockaddr *dst, void *desten, size_t destlen) 694 { 695 struct llentry *la; 696 const char *create_lookup; 697 bool renew; 698 int error; 699 700 KASSERT(m != NULL); 701 702 la = arplookup(ifp, m, NULL, dst, 0); 703 if (la == NULL) 704 goto notfound; 705 706 if ((la->la_flags & LLE_VALID) && 707 ((la->la_flags & LLE_STATIC) || la->la_expire > time_uptime)) { 708 KASSERT(destlen >= ifp->if_addrlen); 709 memcpy(desten, &la->ll_addr, ifp->if_addrlen); 710 LLE_RUNLOCK(la); 711 return 0; 712 } 713 714 notfound: 715 #ifdef IFF_STATICARP /* FreeBSD */ 716 #define _IFF_NOARP (IFF_NOARP | IFF_STATICARP) 717 #else 718 #define _IFF_NOARP IFF_NOARP 719 #endif 720 if (ifp->if_flags & _IFF_NOARP) { 721 if (la != NULL) 722 LLE_RUNLOCK(la); 723 error = ENOTSUP; 724 goto bad; 725 } 726 #undef _IFF_NOARP 727 if (la == NULL) { 728 create_lookup = "create"; 729 IF_AFDATA_WLOCK(ifp); 730 la = lla_create(LLTABLE(ifp), LLE_EXCLUSIVE, dst); 731 IF_AFDATA_WUNLOCK(ifp); 732 if (la == NULL) 733 ARP_STATINC(ARP_STAT_ALLOCFAIL); 734 else 735 arp_init_llentry(ifp, la); 736 } else if (LLE_TRY_UPGRADE(la) == 0) { 737 create_lookup = "lookup"; 738 LLE_RUNLOCK(la); 739 IF_AFDATA_RLOCK(ifp); 740 la = lla_lookup(LLTABLE(ifp), LLE_EXCLUSIVE, dst); 741 IF_AFDATA_RUNLOCK(ifp); 742 } 743 744 error = EINVAL; 745 if (la == NULL) { 746 log(LOG_DEBUG, 747 "%s: failed to %s llentry for %s on %s\n", 748 __func__, create_lookup, inet_ntoa(satocsin(dst)->sin_addr), 749 ifp->if_xname); 750 goto bad; 751 } 752 753 if ((la->la_flags & LLE_VALID) && 754 ((la->la_flags & LLE_STATIC) || la->la_expire > time_uptime)) 755 { 756 KASSERT(destlen >= ifp->if_addrlen); 757 memcpy(desten, &la->ll_addr, ifp->if_addrlen); 758 renew = false; 759 /* 760 * If entry has an expiry time and it is approaching, 761 * see if we need to send an ARP request within this 762 * arpt_down interval. 763 */ 764 if (!(la->la_flags & LLE_STATIC) && 765 time_uptime + la->la_preempt > la->la_expire) 766 { 767 renew = true; 768 la->la_preempt--; 769 } 770 771 LLE_WUNLOCK(la); 772 773 if (renew) { 774 const u_int8_t *enaddr = 775 #if NCARP > 0 776 (ifp->if_type == IFT_CARP) ? 777 CLLADDR(ifp->if_sadl): 778 #endif 779 CLLADDR(ifp->if_sadl); 780 arprequest(ifp, 781 &satocsin(rt->rt_ifa->ifa_addr)->sin_addr, 782 &satocsin(dst)->sin_addr, enaddr); 783 } 784 785 return 0; 786 } 787 788 if (la->la_flags & LLE_STATIC) { /* should not happen! */ 789 LLE_RUNLOCK(la); 790 log(LOG_DEBUG, "%s: ouch, empty static llinfo for %s\n", 791 __func__, inet_ntoa(satocsin(dst)->sin_addr)); 792 error = EINVAL; 793 goto bad; 794 } 795 796 renew = (la->la_asked == 0 || la->la_expire != time_uptime); 797 798 /* 799 * There is an arptab entry, but no ethernet address 800 * response yet. Add the mbuf to the list, dropping 801 * the oldest packet if we have exceeded the system 802 * setting. 803 */ 804 LLE_WLOCK_ASSERT(la); 805 if (la->la_numheld >= arp_maxhold) { 806 if (la->la_hold != NULL) { 807 struct mbuf *next = la->la_hold->m_nextpkt; 808 m_freem(la->la_hold); 809 la->la_hold = next; 810 la->la_numheld--; 811 ARP_STATINC(ARP_STAT_DFRDROPPED); 812 } 813 } 814 if (la->la_hold != NULL) { 815 struct mbuf *curr = la->la_hold; 816 while (curr->m_nextpkt != NULL) 817 curr = curr->m_nextpkt; 818 curr->m_nextpkt = m; 819 } else 820 la->la_hold = m; 821 la->la_numheld++; 822 if (!renew) 823 LLE_DOWNGRADE(la); 824 825 /* 826 * Return EWOULDBLOCK if we have tried less than arp_maxtries. It 827 * will be masked by ether_output(). Return EHOSTDOWN/EHOSTUNREACH 828 * if we have already sent arp_maxtries ARP requests. Retransmit the 829 * ARP request, but not faster than one request per second. 830 */ 831 if (la->la_asked < arp_maxtries) 832 error = EWOULDBLOCK; /* First request. */ 833 else 834 error = (rt != NULL && rt->rt_flags & RTF_GATEWAY) ? 835 EHOSTUNREACH : EHOSTDOWN; 836 837 if (renew) { 838 const u_int8_t *enaddr = 839 #if NCARP > 0 840 (rt != NULL && rt->rt_ifp->if_type == IFT_CARP) ? 841 CLLADDR(rt->rt_ifp->if_sadl): 842 #endif 843 CLLADDR(ifp->if_sadl); 844 la->la_expire = time_uptime; 845 arp_settimer(la, arpt_down); 846 la->la_asked++; 847 LLE_WUNLOCK(la); 848 849 if (rt != NULL) { 850 arprequest(ifp, &satocsin(rt->rt_ifa->ifa_addr)->sin_addr, 851 &satocsin(dst)->sin_addr, enaddr); 852 } else { 853 struct sockaddr_in sin; 854 struct rtentry *_rt; 855 856 sockaddr_in_init(&sin, &la->r_l3addr.addr4, 0); 857 858 /* XXX */ 859 _rt = rtalloc1((struct sockaddr *)&sin, 0); 860 if (_rt == NULL) 861 goto bad; 862 arprequest(ifp, 863 &satocsin(_rt->rt_ifa->ifa_addr)->sin_addr, 864 &satocsin(dst)->sin_addr, enaddr); 865 rtfree(_rt); 866 } 867 return error; 868 } 869 870 LLE_RUNLOCK(la); 871 return error; 872 873 bad: 874 m_freem(m); 875 return error; 876 } 877 878 /* 879 * Common length and type checks are done here, 880 * then the protocol-specific routine is called. 881 */ 882 void 883 arpintr(void) 884 { 885 struct mbuf *m; 886 struct arphdr *ar; 887 int s; 888 int arplen; 889 890 mutex_enter(softnet_lock); 891 KERNEL_LOCK(1, NULL); 892 while (arpintrq.ifq_head) { 893 s = splnet(); 894 IF_DEQUEUE(&arpintrq, m); 895 splx(s); 896 if (m == NULL || (m->m_flags & M_PKTHDR) == 0) 897 panic("arpintr"); 898 899 MCLAIM(m, &arpdomain.dom_mowner); 900 ARP_STATINC(ARP_STAT_RCVTOTAL); 901 902 /* 903 * First, make sure we have at least struct arphdr. 904 */ 905 if (m->m_len < sizeof(struct arphdr) || 906 (ar = mtod(m, struct arphdr *)) == NULL) 907 goto badlen; 908 909 switch (m->m_pkthdr.rcvif->if_type) { 910 case IFT_IEEE1394: 911 arplen = sizeof(struct arphdr) + 912 ar->ar_hln + 2 * ar->ar_pln; 913 break; 914 default: 915 arplen = sizeof(struct arphdr) + 916 2 * ar->ar_hln + 2 * ar->ar_pln; 917 break; 918 } 919 920 if (/* XXX ntohs(ar->ar_hrd) == ARPHRD_ETHER && */ 921 m->m_len >= arplen) 922 switch (ntohs(ar->ar_pro)) { 923 case ETHERTYPE_IP: 924 case ETHERTYPE_IPTRAILERS: 925 in_arpinput(m); 926 continue; 927 default: 928 ARP_STATINC(ARP_STAT_RCVBADPROTO); 929 } 930 else { 931 badlen: 932 ARP_STATINC(ARP_STAT_RCVBADLEN); 933 } 934 m_freem(m); 935 } 936 KERNEL_UNLOCK_ONE(NULL); 937 mutex_exit(softnet_lock); 938 } 939 940 /* 941 * ARP for Internet protocols on 10 Mb/s Ethernet. 942 * Algorithm is that given in RFC 826. 943 * In addition, a sanity check is performed on the sender 944 * protocol address, to catch impersonators. 945 * We no longer handle negotiations for use of trailer protocol: 946 * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent 947 * along with IP replies if we wanted trailers sent to us, 948 * and also sent them in response to IP replies. 949 * This allowed either end to announce the desire to receive 950 * trailer packets. 951 * We no longer reply to requests for ETHERTYPE_TRAIL protocol either, 952 * but formerly didn't normally send requests. 953 */ 954 static void 955 in_arpinput(struct mbuf *m) 956 { 957 struct arphdr *ah; 958 struct ifnet *ifp = m->m_pkthdr.rcvif; 959 struct llentry *la = NULL; 960 struct in_ifaddr *ia; 961 #if NBRIDGE > 0 962 struct in_ifaddr *bridge_ia = NULL; 963 #endif 964 #if NCARP > 0 965 u_int32_t count = 0, index = 0; 966 #endif 967 struct sockaddr sa; 968 struct in_addr isaddr, itaddr, myaddr; 969 int op; 970 void *tha; 971 uint64_t *arps; 972 973 if (__predict_false(m_makewritable(&m, 0, m->m_pkthdr.len, M_DONTWAIT))) 974 goto out; 975 ah = mtod(m, struct arphdr *); 976 op = ntohs(ah->ar_op); 977 978 /* 979 * Fix up ah->ar_hrd if necessary, before using ar_tha() or 980 * ar_tpa(). 981 */ 982 switch (ifp->if_type) { 983 case IFT_IEEE1394: 984 if (ntohs(ah->ar_hrd) == ARPHRD_IEEE1394) 985 ; 986 else { 987 /* XXX this is to make sure we compute ar_tha right */ 988 /* XXX check ar_hrd more strictly? */ 989 ah->ar_hrd = htons(ARPHRD_IEEE1394); 990 } 991 break; 992 default: 993 /* XXX check ar_hrd? */ 994 break; 995 } 996 997 memcpy(&isaddr, ar_spa(ah), sizeof (isaddr)); 998 memcpy(&itaddr, ar_tpa(ah), sizeof (itaddr)); 999 1000 if (m->m_flags & (M_BCAST|M_MCAST)) 1001 ARP_STATINC(ARP_STAT_RCVMCAST); 1002 1003 1004 /* 1005 * Search for a matching interface address 1006 * or any address on the interface to use 1007 * as a dummy address in the rest of this function 1008 */ 1009 1010 INADDR_TO_IA(itaddr, ia); 1011 while (ia != NULL) { 1012 #if NCARP > 0 1013 if (ia->ia_ifp->if_type == IFT_CARP && 1014 ((ia->ia_ifp->if_flags & (IFF_UP|IFF_RUNNING)) == 1015 (IFF_UP|IFF_RUNNING))) { 1016 index++; 1017 if (ia->ia_ifp == m->m_pkthdr.rcvif && 1018 carp_iamatch(ia, ar_sha(ah), 1019 &count, index)) { 1020 break; 1021 } 1022 } else 1023 #endif 1024 if (ia->ia_ifp == m->m_pkthdr.rcvif) 1025 break; 1026 #if NBRIDGE > 0 1027 /* 1028 * If the interface we received the packet on 1029 * is part of a bridge, check to see if we need 1030 * to "bridge" the packet to ourselves at this 1031 * layer. Note we still prefer a perfect match, 1032 * but allow this weaker match if necessary. 1033 */ 1034 if (m->m_pkthdr.rcvif->if_bridge != NULL && 1035 m->m_pkthdr.rcvif->if_bridge == ia->ia_ifp->if_bridge) 1036 bridge_ia = ia; 1037 #endif /* NBRIDGE > 0 */ 1038 1039 NEXT_IA_WITH_SAME_ADDR(ia); 1040 } 1041 1042 #if NBRIDGE > 0 1043 if (ia == NULL && bridge_ia != NULL) { 1044 ia = bridge_ia; 1045 ifp = bridge_ia->ia_ifp; 1046 } 1047 #endif 1048 1049 if (ia == NULL) { 1050 INADDR_TO_IA(isaddr, ia); 1051 while ((ia != NULL) && ia->ia_ifp != m->m_pkthdr.rcvif) 1052 NEXT_IA_WITH_SAME_ADDR(ia); 1053 1054 if (ia == NULL) { 1055 IFP_TO_IA(ifp, ia); 1056 if (ia == NULL) { 1057 ARP_STATINC(ARP_STAT_RCVNOINT); 1058 goto out; 1059 } 1060 } 1061 } 1062 1063 myaddr = ia->ia_addr.sin_addr; 1064 1065 /* XXX checks for bridge case? */ 1066 if (!memcmp(ar_sha(ah), CLLADDR(ifp->if_sadl), ifp->if_addrlen)) { 1067 ARP_STATINC(ARP_STAT_RCVLOCALSHA); 1068 goto out; /* it's from me, ignore it. */ 1069 } 1070 1071 /* XXX checks for bridge case? */ 1072 if (!memcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) { 1073 ARP_STATINC(ARP_STAT_RCVBCASTSHA); 1074 log(LOG_ERR, 1075 "%s: arp: link address is broadcast for IP address %s!\n", 1076 ifp->if_xname, in_fmtaddr(isaddr)); 1077 goto out; 1078 } 1079 1080 /* 1081 * If the source IP address is zero, this is an RFC 5227 ARP probe 1082 */ 1083 if (in_nullhost(isaddr)) 1084 ARP_STATINC(ARP_STAT_RCVZEROSPA); 1085 else if (in_hosteq(isaddr, myaddr)) 1086 ARP_STATINC(ARP_STAT_RCVLOCALSPA); 1087 1088 if (in_nullhost(itaddr)) 1089 ARP_STATINC(ARP_STAT_RCVZEROTPA); 1090 1091 /* DAD check, RFC 5227 2.1.1, Probe Details */ 1092 if (in_hosteq(isaddr, myaddr) || 1093 (in_nullhost(isaddr) && in_hosteq(itaddr, myaddr))) 1094 { 1095 /* If our address is tentative, mark it as duplicated */ 1096 if (ia->ia4_flags & IN_IFF_TENTATIVE) 1097 arp_dad_duplicated((struct ifaddr *)ia); 1098 /* If our address is unuseable, don't reply */ 1099 if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED)) 1100 goto out; 1101 } 1102 1103 /* 1104 * If the target IP address is zero, ignore the packet. 1105 * This prevents the code below from tring to answer 1106 * when we are using IP address zero (booting). 1107 */ 1108 if (in_nullhost(itaddr)) 1109 goto out; 1110 1111 if (in_nullhost(isaddr)) 1112 goto reply; 1113 1114 if (in_hosteq(isaddr, myaddr)) { 1115 log(LOG_ERR, 1116 "duplicate IP address %s sent from link address %s\n", 1117 in_fmtaddr(isaddr), lla_snprintf(ar_sha(ah), ah->ar_hln)); 1118 itaddr = myaddr; 1119 goto reply; 1120 } 1121 1122 if (in_hosteq(itaddr, myaddr)) 1123 la = arpcreate(ifp, m, &isaddr, NULL, 1); 1124 else 1125 la = arplookup(ifp, m, &isaddr, NULL, 1); 1126 if (la == NULL) 1127 goto reply; 1128 1129 if ((la->la_flags & LLE_VALID) && 1130 memcmp(ar_sha(ah), &la->ll_addr, ifp->if_addrlen)) { 1131 if (la->la_flags & LLE_STATIC) { 1132 ARP_STATINC(ARP_STAT_RCVOVERPERM); 1133 if (!log_permanent_modify) 1134 goto out; 1135 log(LOG_INFO, 1136 "%s tried to overwrite permanent arp info" 1137 " for %s\n", 1138 lla_snprintf(ar_sha(ah), ah->ar_hln), 1139 in_fmtaddr(isaddr)); 1140 goto out; 1141 } else if (la->lle_tbl->llt_ifp != ifp) { 1142 /* XXX should not happen? */ 1143 ARP_STATINC(ARP_STAT_RCVOVERINT); 1144 if (!log_wrong_iface) 1145 goto out; 1146 log(LOG_INFO, 1147 "%s on %s tried to overwrite " 1148 "arp info for %s on %s\n", 1149 lla_snprintf(ar_sha(ah), ah->ar_hln), 1150 ifp->if_xname, in_fmtaddr(isaddr), 1151 la->lle_tbl->llt_ifp->if_xname); 1152 goto out; 1153 } else { 1154 ARP_STATINC(ARP_STAT_RCVOVER); 1155 if (log_movements) 1156 log(LOG_INFO, "arp info overwritten " 1157 "for %s by %s\n", 1158 in_fmtaddr(isaddr), 1159 lla_snprintf(ar_sha(ah), 1160 ah->ar_hln)); 1161 } 1162 } 1163 1164 /* XXX llentry should have addrlen? */ 1165 #if 0 1166 /* 1167 * sanity check for the address length. 1168 * XXX this does not work for protocols with variable address 1169 * length. -is 1170 */ 1171 if (sdl->sdl_alen && sdl->sdl_alen != ah->ar_hln) { 1172 ARP_STATINC(ARP_STAT_RCVLENCHG); 1173 log(LOG_WARNING, 1174 "arp from %s: new addr len %d, was %d\n", 1175 in_fmtaddr(isaddr), ah->ar_hln, sdl->sdl_alen); 1176 } 1177 #endif 1178 1179 if (ifp->if_addrlen != ah->ar_hln) { 1180 ARP_STATINC(ARP_STAT_RCVBADLEN); 1181 log(LOG_WARNING, 1182 "arp from %s: addr len: new %d, i/f %d (ignored)\n", 1183 in_fmtaddr(isaddr), ah->ar_hln, 1184 ifp->if_addrlen); 1185 goto reply; 1186 } 1187 1188 #if NTOKEN > 0 1189 /* 1190 * XXX uses m_data and assumes the complete answer including 1191 * XXX token-ring headers is in the same buf 1192 */ 1193 if (ifp->if_type == IFT_ISO88025) { 1194 struct token_header *trh; 1195 1196 trh = (struct token_header *)M_TRHSTART(m); 1197 if (trh->token_shost[0] & TOKEN_RI_PRESENT) { 1198 struct token_rif *rif; 1199 size_t riflen; 1200 1201 rif = TOKEN_RIF(trh); 1202 riflen = (ntohs(rif->tr_rcf) & 1203 TOKEN_RCF_LEN_MASK) >> 8; 1204 1205 if (riflen > 2 && 1206 riflen < sizeof(struct token_rif) && 1207 (riflen & 1) == 0) { 1208 rif->tr_rcf ^= htons(TOKEN_RCF_DIRECTION); 1209 rif->tr_rcf &= htons(~TOKEN_RCF_BROADCAST_MASK); 1210 memcpy(TOKEN_RIF_LLE(la), rif, riflen); 1211 } 1212 } 1213 } 1214 #endif /* NTOKEN > 0 */ 1215 1216 KASSERT(sizeof(la->ll_addr) >= ifp->if_addrlen); 1217 (void)memcpy(&la->ll_addr, ar_sha(ah), ifp->if_addrlen); 1218 la->la_flags |= LLE_VALID; 1219 if ((la->la_flags & LLE_STATIC) == 0) { 1220 la->la_expire = time_uptime + arpt_keep; 1221 arp_settimer(la, arpt_keep); 1222 } 1223 la->la_asked = 0; 1224 /* rt->rt_flags &= ~RTF_REJECT; */ 1225 1226 if (la->la_hold != NULL) { 1227 int n = la->la_numheld; 1228 struct mbuf *m_hold, *m_hold_next; 1229 struct sockaddr_in sin; 1230 1231 sockaddr_in_init(&sin, &la->r_l3addr.addr4, 0); 1232 1233 m_hold = la->la_hold; 1234 la->la_hold = NULL; 1235 la->la_numheld = 0; 1236 /* 1237 * We have to unlock here because if_output would call 1238 * arpresolve 1239 */ 1240 LLE_WUNLOCK(la); 1241 ARP_STATADD(ARP_STAT_DFRSENT, n); 1242 for (; m_hold != NULL; m_hold = m_hold_next) { 1243 m_hold_next = m_hold->m_nextpkt; 1244 m_hold->m_nextpkt = NULL; 1245 (*ifp->if_output)(ifp, m_hold, sintosa(&sin), NULL); 1246 } 1247 } else 1248 LLE_WUNLOCK(la); 1249 la = NULL; 1250 1251 reply: 1252 if (la != NULL) { 1253 LLE_WUNLOCK(la); 1254 la = NULL; 1255 } 1256 if (op != ARPOP_REQUEST) { 1257 if (op == ARPOP_REPLY) 1258 ARP_STATINC(ARP_STAT_RCVREPLY); 1259 goto out; 1260 } 1261 ARP_STATINC(ARP_STAT_RCVREQUEST); 1262 if (in_hosteq(itaddr, myaddr)) { 1263 /* If our address is unuseable, don't reply */ 1264 if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED)) 1265 goto out; 1266 /* I am the target */ 1267 tha = ar_tha(ah); 1268 if (tha) 1269 memcpy(tha, ar_sha(ah), ah->ar_hln); 1270 memcpy(ar_sha(ah), CLLADDR(ifp->if_sadl), ah->ar_hln); 1271 } else { 1272 /* Proxy ARP */ 1273 struct llentry *lle = NULL; 1274 struct sockaddr_in sin; 1275 1276 #if NCARP > 0 1277 if (ifp->if_type == IFT_CARP && 1278 m->m_pkthdr.rcvif->if_type != IFT_CARP) 1279 goto out; 1280 #endif 1281 1282 tha = ar_tha(ah); 1283 1284 sockaddr_in_init(&sin, &itaddr, 0); 1285 1286 IF_AFDATA_RLOCK(ifp); 1287 lle = lla_lookup(LLTABLE(ifp), 0, (struct sockaddr *)&sin); 1288 IF_AFDATA_RUNLOCK(ifp); 1289 1290 if ((lle != NULL) && (lle->la_flags & LLE_PUB)) { 1291 (void)memcpy(tha, ar_sha(ah), ah->ar_hln); 1292 (void)memcpy(ar_sha(ah), &lle->ll_addr, ah->ar_hln); 1293 LLE_RUNLOCK(lle); 1294 } else { 1295 if (lle != NULL) 1296 LLE_RUNLOCK(lle); 1297 goto drop; 1298 } 1299 } 1300 1301 memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln); 1302 memcpy(ar_spa(ah), &itaddr, ah->ar_pln); 1303 ah->ar_op = htons(ARPOP_REPLY); 1304 ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */ 1305 switch (ifp->if_type) { 1306 case IFT_IEEE1394: 1307 /* 1308 * ieee1394 arp reply is broadcast 1309 */ 1310 m->m_flags &= ~M_MCAST; 1311 m->m_flags |= M_BCAST; 1312 m->m_len = sizeof(*ah) + (2 * ah->ar_pln) + ah->ar_hln; 1313 break; 1314 1315 default: 1316 m->m_flags &= ~(M_BCAST|M_MCAST); /* never reply by broadcast */ 1317 m->m_len = sizeof(*ah) + (2 * ah->ar_pln) + (2 * ah->ar_hln); 1318 break; 1319 } 1320 m->m_pkthdr.len = m->m_len; 1321 sa.sa_family = AF_ARP; 1322 sa.sa_len = 2; 1323 arps = ARP_STAT_GETREF(); 1324 arps[ARP_STAT_SNDTOTAL]++; 1325 arps[ARP_STAT_SNDREPLY]++; 1326 ARP_STAT_PUTREF(); 1327 (*ifp->if_output)(ifp, m, &sa, NULL); 1328 return; 1329 1330 out: 1331 if (la != NULL) 1332 LLE_WUNLOCK(la); 1333 drop: 1334 m_freem(m); 1335 } 1336 1337 /* 1338 * Lookup or a new address in arptab. 1339 */ 1340 static struct llentry * 1341 arplookup(struct ifnet *ifp, struct mbuf *m, const struct in_addr *addr, 1342 const struct sockaddr *sa, int wlock) 1343 { 1344 struct sockaddr_in sin; 1345 struct llentry *la; 1346 int flags = wlock ? LLE_EXCLUSIVE : 0; 1347 1348 1349 if (sa == NULL) { 1350 KASSERT(addr != NULL); 1351 sockaddr_in_init(&sin, addr, 0); 1352 sa = sintocsa(&sin); 1353 } 1354 1355 IF_AFDATA_RLOCK(ifp); 1356 la = lla_lookup(LLTABLE(ifp), flags, sa); 1357 IF_AFDATA_RUNLOCK(ifp); 1358 1359 return la; 1360 } 1361 1362 static struct llentry * 1363 arpcreate(struct ifnet *ifp, struct mbuf *m, const struct in_addr *addr, 1364 const struct sockaddr *sa, int wlock) 1365 { 1366 struct sockaddr_in sin; 1367 struct llentry *la; 1368 int flags = wlock ? LLE_EXCLUSIVE : 0; 1369 1370 if (sa == NULL) { 1371 KASSERT(addr != NULL); 1372 sockaddr_in_init(&sin, addr, 0); 1373 sa = sintocsa(&sin); 1374 } 1375 1376 la = arplookup(ifp, m, addr, sa, wlock); 1377 1378 if (la == NULL) { 1379 IF_AFDATA_WLOCK(ifp); 1380 la = lla_create(LLTABLE(ifp), flags, sa); 1381 IF_AFDATA_WUNLOCK(ifp); 1382 1383 if (la != NULL) 1384 arp_init_llentry(ifp, la); 1385 } 1386 1387 return la; 1388 } 1389 1390 int 1391 arpioctl(u_long cmd, void *data) 1392 { 1393 1394 return EOPNOTSUPP; 1395 } 1396 1397 void 1398 arp_ifinit(struct ifnet *ifp, struct ifaddr *ifa) 1399 { 1400 struct in_addr *ip; 1401 struct in_ifaddr *ia = (struct in_ifaddr *)ifa; 1402 1403 /* 1404 * Warn the user if another station has this IP address, 1405 * but only if the interface IP address is not zero. 1406 */ 1407 ip = &IA_SIN(ifa)->sin_addr; 1408 if (!in_nullhost(*ip) && 1409 (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED)) == 0) { 1410 struct llentry *lle; 1411 1412 arprequest(ifp, ip, ip, CLLADDR(ifp->if_sadl)); 1413 1414 /* 1415 * interface address is considered static entry 1416 * because the output of the arp utility shows 1417 * that L2 entry as permanent 1418 */ 1419 IF_AFDATA_WLOCK(ifp); 1420 lle = lla_create(LLTABLE(ifp), (LLE_IFADDR | LLE_STATIC), 1421 (struct sockaddr *)IA_SIN(ifa)); 1422 IF_AFDATA_WUNLOCK(ifp); 1423 if (lle == NULL) 1424 log(LOG_INFO, "%s: cannot create arp entry for" 1425 " interface address\n", __func__); 1426 else { 1427 arp_init_llentry(ifp, lle); 1428 LLE_RUNLOCK(lle); 1429 } 1430 } 1431 1432 ifa->ifa_rtrequest = arp_rtrequest; 1433 ifa->ifa_flags |= RTF_CONNECTED; 1434 1435 /* ARP will handle DAD for this address. */ 1436 if (ia->ia4_flags & IN_IFF_TRYTENTATIVE) { 1437 ia->ia4_flags |= IN_IFF_TENTATIVE; 1438 ia->ia_dad_start = arp_dad_start; 1439 ia->ia_dad_stop = arp_dad_stop; 1440 } 1441 } 1442 1443 TAILQ_HEAD(dadq_head, dadq); 1444 struct dadq { 1445 TAILQ_ENTRY(dadq) dad_list; 1446 struct ifaddr *dad_ifa; 1447 int dad_count; /* max ARP to send */ 1448 int dad_arp_tcount; /* # of trials to send ARP */ 1449 int dad_arp_ocount; /* ARP sent so far */ 1450 int dad_arp_announce; /* max ARP announcements */ 1451 int dad_arp_acount; /* # of announcements */ 1452 struct callout dad_timer_ch; 1453 }; 1454 MALLOC_JUSTDEFINE(M_IPARP, "ARP DAD", "ARP DAD Structure"); 1455 1456 static struct dadq_head dadq; 1457 static int dad_init = 0; 1458 static int dad_maxtry = 15; /* max # of *tries* to transmit DAD packet */ 1459 1460 static struct dadq * 1461 arp_dad_find(struct ifaddr *ifa) 1462 { 1463 struct dadq *dp; 1464 1465 TAILQ_FOREACH(dp, &dadq, dad_list) { 1466 if (dp->dad_ifa == ifa) 1467 return dp; 1468 } 1469 return NULL; 1470 } 1471 1472 static void 1473 arp_dad_starttimer(struct dadq *dp, int ticks) 1474 { 1475 1476 callout_reset(&dp->dad_timer_ch, ticks, 1477 (void (*)(void *))arp_dad_timer, (void *)dp->dad_ifa); 1478 } 1479 1480 static void 1481 arp_dad_stoptimer(struct dadq *dp) 1482 { 1483 1484 callout_stop(&dp->dad_timer_ch); 1485 } 1486 1487 static void 1488 arp_dad_output(struct dadq *dp, struct ifaddr *ifa) 1489 { 1490 struct in_ifaddr *ia = (struct in_ifaddr *)ifa; 1491 struct ifnet *ifp = ifa->ifa_ifp; 1492 struct in_addr sip; 1493 1494 dp->dad_arp_tcount++; 1495 if ((ifp->if_flags & IFF_UP) == 0) 1496 return; 1497 if ((ifp->if_flags & IFF_RUNNING) == 0) 1498 return; 1499 1500 dp->dad_arp_tcount = 0; 1501 dp->dad_arp_ocount++; 1502 1503 memset(&sip, 0, sizeof(sip)); 1504 arprequest(ifa->ifa_ifp, &sip, &ia->ia_addr.sin_addr, 1505 CLLADDR(ifa->ifa_ifp->if_sadl)); 1506 } 1507 1508 /* 1509 * Start Duplicate Address Detection (DAD) for specified interface address. 1510 */ 1511 static void 1512 arp_dad_start(struct ifaddr *ifa) 1513 { 1514 struct in_ifaddr *ia = (struct in_ifaddr *)ifa; 1515 struct dadq *dp; 1516 1517 if (!dad_init) { 1518 TAILQ_INIT(&dadq); 1519 dad_init++; 1520 } 1521 1522 /* 1523 * If we don't need DAD, don't do it. 1524 * - DAD is disabled (ip_dad_count == 0) 1525 */ 1526 if (!(ia->ia4_flags & IN_IFF_TENTATIVE)) { 1527 log(LOG_DEBUG, 1528 "%s: called with non-tentative address %s(%s)\n", __func__, 1529 in_fmtaddr(ia->ia_addr.sin_addr), 1530 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1531 return; 1532 } 1533 if (!ip_dad_count) { 1534 struct in_addr *ip = &IA_SIN(ifa)->sin_addr; 1535 1536 ia->ia4_flags &= ~IN_IFF_TENTATIVE; 1537 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 1538 arprequest(ifa->ifa_ifp, ip, ip, 1539 CLLADDR(ifa->ifa_ifp->if_sadl)); 1540 return; 1541 } 1542 if (ifa->ifa_ifp == NULL) 1543 panic("arp_dad_start: ifa->ifa_ifp == NULL"); 1544 if (!(ifa->ifa_ifp->if_flags & IFF_UP)) 1545 return; 1546 if (arp_dad_find(ifa) != NULL) { 1547 /* DAD already in progress */ 1548 return; 1549 } 1550 1551 dp = malloc(sizeof(*dp), M_IPARP, M_NOWAIT); 1552 if (dp == NULL) { 1553 log(LOG_ERR, "%s: memory allocation failed for %s(%s)\n", 1554 __func__, in_fmtaddr(ia->ia_addr.sin_addr), 1555 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1556 return; 1557 } 1558 memset(dp, 0, sizeof(*dp)); 1559 callout_init(&dp->dad_timer_ch, CALLOUT_MPSAFE); 1560 TAILQ_INSERT_TAIL(&dadq, (struct dadq *)dp, dad_list); 1561 1562 arplog((LOG_DEBUG, "%s: starting DAD for %s\n", if_name(ifa->ifa_ifp), 1563 in_fmtaddr(ia->ia_addr.sin_addr))); 1564 1565 /* 1566 * Send ARP packet for DAD, ip_dad_count times. 1567 * Note that we must delay the first transmission. 1568 */ 1569 dp->dad_ifa = ifa; 1570 ifaref(ifa); /* just for safety */ 1571 dp->dad_count = ip_dad_count; 1572 dp->dad_arp_announce = 0; /* Will be set when starting to announce */ 1573 dp->dad_arp_acount = dp->dad_arp_ocount = dp->dad_arp_tcount = 0; 1574 1575 arp_dad_starttimer(dp, cprng_fast32() % (PROBE_WAIT * hz)); 1576 } 1577 1578 /* 1579 * terminate DAD unconditionally. used for address removals. 1580 */ 1581 static void 1582 arp_dad_stop(struct ifaddr *ifa) 1583 { 1584 struct dadq *dp; 1585 1586 if (!dad_init) 1587 return; 1588 dp = arp_dad_find(ifa); 1589 if (dp == NULL) { 1590 /* DAD wasn't started yet */ 1591 return; 1592 } 1593 1594 arp_dad_stoptimer(dp); 1595 1596 TAILQ_REMOVE(&dadq, dp, dad_list); 1597 free(dp, M_IPARP); 1598 dp = NULL; 1599 ifafree(ifa); 1600 } 1601 1602 static void 1603 arp_dad_timer(struct ifaddr *ifa) 1604 { 1605 struct in_ifaddr *ia = (struct in_ifaddr *)ifa; 1606 struct dadq *dp; 1607 struct in_addr *ip; 1608 1609 mutex_enter(softnet_lock); 1610 KERNEL_LOCK(1, NULL); 1611 1612 /* Sanity check */ 1613 if (ia == NULL) { 1614 log(LOG_ERR, "%s: called with null parameter\n", __func__); 1615 goto done; 1616 } 1617 dp = arp_dad_find(ifa); 1618 if (dp == NULL) { 1619 log(LOG_ERR, "%s: DAD structure not found\n", __func__); 1620 goto done; 1621 } 1622 if (ia->ia4_flags & IN_IFF_DUPLICATED) { 1623 log(LOG_ERR, "%s: called with duplicate address %s(%s)\n", 1624 __func__, in_fmtaddr(ia->ia_addr.sin_addr), 1625 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1626 goto done; 1627 } 1628 if ((ia->ia4_flags & IN_IFF_TENTATIVE) == 0 && dp->dad_arp_acount == 0) 1629 { 1630 log(LOG_ERR, "%s: called with non-tentative address %s(%s)\n", 1631 __func__, in_fmtaddr(ia->ia_addr.sin_addr), 1632 ifa->ifa_ifp ? if_name(ifa->ifa_ifp) : "???"); 1633 goto done; 1634 } 1635 1636 /* timeouted with IFF_{RUNNING,UP} check */ 1637 if (dp->dad_arp_tcount > dad_maxtry) { 1638 arplog((LOG_INFO, "%s: could not run DAD, driver problem?\n", 1639 if_name(ifa->ifa_ifp))); 1640 1641 TAILQ_REMOVE(&dadq, dp, dad_list); 1642 free(dp, M_IPARP); 1643 dp = NULL; 1644 ifafree(ifa); 1645 goto done; 1646 } 1647 1648 /* Need more checks? */ 1649 if (dp->dad_arp_ocount < dp->dad_count) { 1650 int adelay; 1651 1652 /* 1653 * We have more ARP to go. Send ARP packet for DAD. 1654 */ 1655 arp_dad_output(dp, ifa); 1656 if (dp->dad_arp_ocount < dp->dad_count) 1657 adelay = (PROBE_MIN * hz) + 1658 (cprng_fast32() % 1659 ((PROBE_MAX * hz) - (PROBE_MIN * hz))); 1660 else 1661 adelay = ANNOUNCE_WAIT * hz; 1662 arp_dad_starttimer(dp, adelay); 1663 goto done; 1664 } else if (dp->dad_arp_acount == 0) { 1665 /* 1666 * We are done with DAD. 1667 * No duplicate address found. 1668 */ 1669 ia->ia4_flags &= ~IN_IFF_TENTATIVE; 1670 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 1671 arplog((LOG_DEBUG, 1672 "%s: DAD complete for %s - no duplicates found\n", 1673 if_name(ifa->ifa_ifp), 1674 in_fmtaddr(ia->ia_addr.sin_addr))); 1675 dp->dad_arp_announce = ANNOUNCE_NUM; 1676 goto announce; 1677 } else if (dp->dad_arp_acount < dp->dad_arp_announce) { 1678 announce: 1679 /* 1680 * Announce the address. 1681 */ 1682 ip = &IA_SIN(ifa)->sin_addr; 1683 arprequest(ifa->ifa_ifp, ip, ip, 1684 CLLADDR(ifa->ifa_ifp->if_sadl)); 1685 dp->dad_arp_acount++; 1686 if (dp->dad_arp_acount < dp->dad_arp_announce) { 1687 arp_dad_starttimer(dp, ANNOUNCE_INTERVAL * hz); 1688 goto done; 1689 } 1690 arplog((LOG_DEBUG, 1691 "%s: ARP announcement complete for %s\n", 1692 if_name(ifa->ifa_ifp), 1693 in_fmtaddr(ia->ia_addr.sin_addr))); 1694 } 1695 1696 TAILQ_REMOVE(&dadq, dp, dad_list); 1697 free(dp, M_IPARP); 1698 dp = NULL; 1699 ifafree(ifa); 1700 1701 done: 1702 KERNEL_UNLOCK_ONE(NULL); 1703 mutex_exit(softnet_lock); 1704 } 1705 1706 static void 1707 arp_dad_duplicated(struct ifaddr *ifa) 1708 { 1709 struct in_ifaddr *ia = (struct in_ifaddr *)ifa; 1710 struct ifnet *ifp; 1711 struct dadq *dp; 1712 1713 dp = arp_dad_find(ifa); 1714 if (dp == NULL) { 1715 log(LOG_ERR, "%s: DAD structure not found\n", __func__); 1716 return; 1717 } 1718 1719 ifp = ifa->ifa_ifp; 1720 log(LOG_ERR, 1721 "%s: DAD detected duplicate IPv4 address %s: ARP out=%d\n", 1722 if_name(ifp), in_fmtaddr(ia->ia_addr.sin_addr), 1723 dp->dad_arp_ocount); 1724 1725 ia->ia4_flags &= ~IN_IFF_TENTATIVE; 1726 ia->ia4_flags |= IN_IFF_DUPLICATED; 1727 1728 /* We are done with DAD, with duplicated address found. (failure) */ 1729 arp_dad_stoptimer(dp); 1730 1731 /* Inform the routing socket that DAD has completed */ 1732 rt_newaddrmsg(RTM_NEWADDR, ifa, 0, NULL); 1733 1734 TAILQ_REMOVE(&dadq, dp, dad_list); 1735 free(dp, M_IPARP); 1736 dp = NULL; 1737 ifafree(ifa); 1738 } 1739 1740 /* 1741 * Called from 10 Mb/s Ethernet interrupt handlers 1742 * when ether packet type ETHERTYPE_REVARP 1743 * is received. Common length and type checks are done here, 1744 * then the protocol-specific routine is called. 1745 */ 1746 void 1747 revarpinput(struct mbuf *m) 1748 { 1749 struct arphdr *ar; 1750 1751 if (m->m_len < sizeof(struct arphdr)) 1752 goto out; 1753 ar = mtod(m, struct arphdr *); 1754 #if 0 /* XXX I don't think we need this... and it will prevent other LL */ 1755 if (ntohs(ar->ar_hrd) != ARPHRD_ETHER) 1756 goto out; 1757 #endif 1758 if (m->m_len < sizeof(struct arphdr) + 2 * (ar->ar_hln + ar->ar_pln)) 1759 goto out; 1760 switch (ntohs(ar->ar_pro)) { 1761 case ETHERTYPE_IP: 1762 case ETHERTYPE_IPTRAILERS: 1763 in_revarpinput(m); 1764 return; 1765 1766 default: 1767 break; 1768 } 1769 out: 1770 m_freem(m); 1771 } 1772 1773 /* 1774 * RARP for Internet protocols on 10 Mb/s Ethernet. 1775 * Algorithm is that given in RFC 903. 1776 * We are only using for bootstrap purposes to get an ip address for one of 1777 * our interfaces. Thus we support no user-interface. 1778 * 1779 * Since the contents of the RARP reply are specific to the interface that 1780 * sent the request, this code must ensure that they are properly associated. 1781 * 1782 * Note: also supports ARP via RARP packets, per the RFC. 1783 */ 1784 void 1785 in_revarpinput(struct mbuf *m) 1786 { 1787 struct ifnet *ifp; 1788 struct arphdr *ah; 1789 void *tha; 1790 int op; 1791 1792 ah = mtod(m, struct arphdr *); 1793 op = ntohs(ah->ar_op); 1794 1795 switch (m->m_pkthdr.rcvif->if_type) { 1796 case IFT_IEEE1394: 1797 /* ARP without target hardware address is not supported */ 1798 goto out; 1799 default: 1800 break; 1801 } 1802 1803 switch (op) { 1804 case ARPOP_REQUEST: 1805 case ARPOP_REPLY: /* per RFC */ 1806 in_arpinput(m); 1807 return; 1808 case ARPOP_REVREPLY: 1809 break; 1810 case ARPOP_REVREQUEST: /* handled by rarpd(8) */ 1811 default: 1812 goto out; 1813 } 1814 if (!revarp_in_progress) 1815 goto out; 1816 ifp = m->m_pkthdr.rcvif; 1817 if (ifp != myip_ifp) /* !same interface */ 1818 goto out; 1819 if (myip_initialized) 1820 goto wake; 1821 tha = ar_tha(ah); 1822 if (tha == NULL) 1823 goto out; 1824 if (memcmp(tha, CLLADDR(ifp->if_sadl), ifp->if_sadl->sdl_alen)) 1825 goto out; 1826 memcpy(&srv_ip, ar_spa(ah), sizeof(srv_ip)); 1827 memcpy(&myip, ar_tpa(ah), sizeof(myip)); 1828 myip_initialized = 1; 1829 wake: /* Do wakeup every time in case it was missed. */ 1830 wakeup((void *)&myip); 1831 1832 out: 1833 m_freem(m); 1834 } 1835 1836 /* 1837 * Send a RARP request for the ip address of the specified interface. 1838 * The request should be RFC 903-compliant. 1839 */ 1840 static void 1841 revarprequest(struct ifnet *ifp) 1842 { 1843 struct sockaddr sa; 1844 struct mbuf *m; 1845 struct arphdr *ah; 1846 void *tha; 1847 1848 if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) 1849 return; 1850 MCLAIM(m, &arpdomain.dom_mowner); 1851 m->m_len = sizeof(*ah) + 2*sizeof(struct in_addr) + 1852 2*ifp->if_addrlen; 1853 m->m_pkthdr.len = m->m_len; 1854 MH_ALIGN(m, m->m_len); 1855 ah = mtod(m, struct arphdr *); 1856 memset(ah, 0, m->m_len); 1857 ah->ar_pro = htons(ETHERTYPE_IP); 1858 ah->ar_hln = ifp->if_addrlen; /* hardware address length */ 1859 ah->ar_pln = sizeof(struct in_addr); /* protocol address length */ 1860 ah->ar_op = htons(ARPOP_REVREQUEST); 1861 1862 memcpy(ar_sha(ah), CLLADDR(ifp->if_sadl), ah->ar_hln); 1863 tha = ar_tha(ah); 1864 if (tha == NULL) { 1865 m_free(m); 1866 return; 1867 } 1868 memcpy(tha, CLLADDR(ifp->if_sadl), ah->ar_hln); 1869 1870 sa.sa_family = AF_ARP; 1871 sa.sa_len = 2; 1872 m->m_flags |= M_BCAST; 1873 1874 KERNEL_LOCK(1, NULL); 1875 (*ifp->if_output)(ifp, m, &sa, NULL); 1876 KERNEL_UNLOCK_ONE(NULL); 1877 } 1878 1879 /* 1880 * RARP for the ip address of the specified interface, but also 1881 * save the ip address of the server that sent the answer. 1882 * Timeout if no response is received. 1883 */ 1884 int 1885 revarpwhoarewe(struct ifnet *ifp, struct in_addr *serv_in, 1886 struct in_addr *clnt_in) 1887 { 1888 int result, count = 20; 1889 1890 myip_initialized = 0; 1891 myip_ifp = ifp; 1892 1893 revarp_in_progress = 1; 1894 while (count--) { 1895 revarprequest(ifp); 1896 result = tsleep((void *)&myip, PSOCK, "revarp", hz/2); 1897 if (result != EWOULDBLOCK) 1898 break; 1899 } 1900 revarp_in_progress = 0; 1901 1902 if (!myip_initialized) 1903 return ENETUNREACH; 1904 1905 memcpy(serv_in, &srv_ip, sizeof(*serv_in)); 1906 memcpy(clnt_in, &myip, sizeof(*clnt_in)); 1907 return 0; 1908 } 1909 1910 void 1911 arp_stat_add(int type, uint64_t count) 1912 { 1913 ARP_STATADD(type, count); 1914 } 1915 1916 static int 1917 sysctl_net_inet_arp_stats(SYSCTLFN_ARGS) 1918 { 1919 1920 return NETSTAT_SYSCTL(arpstat_percpu, ARP_NSTATS); 1921 } 1922 1923 static void 1924 sysctl_net_inet_arp_setup(struct sysctllog **clog) 1925 { 1926 const struct sysctlnode *node; 1927 1928 sysctl_createv(clog, 0, NULL, NULL, 1929 CTLFLAG_PERMANENT, 1930 CTLTYPE_NODE, "inet", NULL, 1931 NULL, 0, NULL, 0, 1932 CTL_NET, PF_INET, CTL_EOL); 1933 sysctl_createv(clog, 0, NULL, &node, 1934 CTLFLAG_PERMANENT, 1935 CTLTYPE_NODE, "arp", 1936 SYSCTL_DESCR("Address Resolution Protocol"), 1937 NULL, 0, NULL, 0, 1938 CTL_NET, PF_INET, CTL_CREATE, CTL_EOL); 1939 1940 sysctl_createv(clog, 0, NULL, NULL, 1941 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1942 CTLTYPE_INT, "keep", 1943 SYSCTL_DESCR("Valid ARP entry lifetime in seconds"), 1944 NULL, 0, &arpt_keep, 0, 1945 CTL_NET,PF_INET, node->sysctl_num, CTL_CREATE, CTL_EOL); 1946 1947 sysctl_createv(clog, 0, NULL, NULL, 1948 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1949 CTLTYPE_INT, "down", 1950 SYSCTL_DESCR("Failed ARP entry lifetime in seconds"), 1951 NULL, 0, &arpt_down, 0, 1952 CTL_NET,PF_INET, node->sysctl_num, CTL_CREATE, CTL_EOL); 1953 1954 sysctl_createv(clog, 0, NULL, NULL, 1955 CTLFLAG_PERMANENT, 1956 CTLTYPE_STRUCT, "stats", 1957 SYSCTL_DESCR("ARP statistics"), 1958 sysctl_net_inet_arp_stats, 0, NULL, 0, 1959 CTL_NET,PF_INET, node->sysctl_num, CTL_CREATE, CTL_EOL); 1960 1961 sysctl_createv(clog, 0, NULL, NULL, 1962 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1963 CTLTYPE_INT, "log_movements", 1964 SYSCTL_DESCR("log ARP replies from MACs different than" 1965 " the one in the cache"), 1966 NULL, 0, &log_movements, 0, 1967 CTL_NET,PF_INET, node->sysctl_num, CTL_CREATE, CTL_EOL); 1968 1969 sysctl_createv(clog, 0, NULL, NULL, 1970 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1971 CTLTYPE_INT, "log_permanent_modify", 1972 SYSCTL_DESCR("log ARP replies from MACs different than" 1973 " the one in the permanent arp entry"), 1974 NULL, 0, &log_permanent_modify, 0, 1975 CTL_NET,PF_INET, node->sysctl_num, CTL_CREATE, CTL_EOL); 1976 1977 sysctl_createv(clog, 0, NULL, NULL, 1978 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1979 CTLTYPE_INT, "log_wrong_iface", 1980 SYSCTL_DESCR("log ARP packets arriving on the wrong" 1981 " interface"), 1982 NULL, 0, &log_wrong_iface, 0, 1983 CTL_NET,PF_INET, node->sysctl_num, CTL_CREATE, CTL_EOL); 1984 1985 sysctl_createv(clog, 0, NULL, NULL, 1986 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1987 CTLTYPE_INT, "log_unknown_network", 1988 SYSCTL_DESCR("log ARP packets from non-local network"), 1989 NULL, 0, &log_unknown_network, 0, 1990 CTL_NET,PF_INET, node->sysctl_num, CTL_CREATE, CTL_EOL); 1991 1992 sysctl_createv(clog, 0, NULL, NULL, 1993 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 1994 CTLTYPE_INT, "debug", 1995 SYSCTL_DESCR("Enable ARP DAD debug output"), 1996 NULL, 0, &arp_debug, 0, 1997 CTL_NET, PF_INET, node->sysctl_num, CTL_CREATE, CTL_EOL); 1998 } 1999 2000 #endif /* INET */ 2001