1 /* 2 * Copyright (c) 2004, 2005 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Jeffrey M. Hsu. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of The DragonFly Project nor the names of its 16 * contributors may be used to endorse or promote products derived 17 * from this software without specific, prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 22 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 23 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 25 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * 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. All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Berkeley and its contributors. 49 * 4. Neither the name of the University nor the names of its contributors 50 * may be used to endorse or promote products derived from this software 51 * without specific prior written permission. 52 * 53 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 54 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 55 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 56 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 57 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 58 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 59 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 60 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 61 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 62 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 63 * SUCH DAMAGE. 64 * 65 * @(#)if_ether.c 8.1 (Berkeley) 6/10/93 66 * $FreeBSD: src/sys/netinet/if_ether.c,v 1.64.2.23 2003/04/11 07:23:15 fjoe Exp $ 67 */ 68 69 /* 70 * Ethernet address resolution protocol. 71 * TODO: 72 * add "inuse/lock" bit (or ref. count) along with valid bit 73 */ 74 75 #include "opt_inet.h" 76 #include "opt_carp.h" 77 78 #include <sys/param.h> 79 #include <sys/kernel.h> 80 #include <sys/queue.h> 81 #include <sys/sysctl.h> 82 #include <sys/systm.h> 83 #include <sys/mbuf.h> 84 #include <sys/malloc.h> 85 #include <sys/socket.h> 86 #include <sys/syslog.h> 87 #include <sys/lock.h> 88 89 #include <net/if.h> 90 #include <net/if_dl.h> 91 #include <net/if_types.h> 92 #include <net/route.h> 93 #include <net/netisr.h> 94 #include <net/if_llc.h> 95 96 #include <netinet/in.h> 97 #include <netinet/in_var.h> 98 #include <netinet/if_ether.h> 99 100 #include <sys/thread2.h> 101 #include <sys/msgport2.h> 102 #include <net/netmsg2.h> 103 #include <sys/mplock2.h> 104 105 #ifdef CARP 106 #include <netinet/ip_carp.h> 107 #endif 108 109 #define SIN(s) ((struct sockaddr_in *)s) 110 #define SDL(s) ((struct sockaddr_dl *)s) 111 112 SYSCTL_DECL(_net_link_ether); 113 SYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, ""); 114 115 /* timer values */ 116 static int arpt_prune = (5*60*1); /* walk list every 5 minutes */ 117 static int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */ 118 static int arpt_down = 20; /* once declared down, don't send for 20 sec */ 119 120 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW, 121 &arpt_prune, 0, ""); 122 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW, 123 &arpt_keep, 0, ""); 124 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW, 125 &arpt_down, 0, ""); 126 127 #define rt_expire rt_rmx.rmx_expire 128 129 struct llinfo_arp { 130 LIST_ENTRY(llinfo_arp) la_le; 131 struct rtentry *la_rt; 132 struct mbuf *la_hold; /* last packet until resolved/timeout */ 133 struct lwkt_port *la_msgport; /* last packet's msgport */ 134 u_short la_preempt; /* countdown for pre-expiry arps */ 135 u_short la_asked; /* #times we QUERIED following expiration */ 136 }; 137 138 static LIST_HEAD(, llinfo_arp) llinfo_arp_list[MAXCPU]; 139 140 static int arp_maxtries = 5; 141 static int useloopback = 1; /* use loopback interface for local traffic */ 142 static int arp_proxyall = 0; 143 static int arp_refresh = 60; /* refresh arp cache ~60 (not impl yet) */ 144 static int arp_restricted_match = 0; 145 146 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW, 147 &arp_maxtries, 0, "ARP resolution attempts before returning error"); 148 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW, 149 &useloopback, 0, "Use the loopback interface for local traffic"); 150 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW, 151 &arp_proxyall, 0, "Enable proxy ARP for all suitable requests"); 152 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, restricted_match, CTLFLAG_RW, 153 &arp_restricted_match, 0, "Only match against the sender"); 154 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, refresh, CTLFLAG_RW, 155 &arp_refresh, 0, "Preemptively refresh the ARP"); 156 157 static void arp_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 158 static void arprequest(struct ifnet *, const struct in_addr *, 159 const struct in_addr *, const u_char *); 160 static void arprequest_async(struct ifnet *, const struct in_addr *, 161 const struct in_addr *, const u_char *); 162 static void arpintr(netmsg_t msg); 163 static void arptfree(struct llinfo_arp *); 164 static void arptimer(void *); 165 static struct llinfo_arp * 166 arplookup(in_addr_t, boolean_t, boolean_t, boolean_t); 167 #ifdef INET 168 static void in_arpinput(struct mbuf *); 169 #endif 170 171 static struct callout arptimer_ch[MAXCPU]; 172 173 /* 174 * Timeout routine. Age arp_tab entries periodically. 175 */ 176 /* ARGSUSED */ 177 static void 178 arptimer(void *ignored_arg) 179 { 180 struct llinfo_arp *la, *nla; 181 182 crit_enter(); 183 LIST_FOREACH_MUTABLE(la, &llinfo_arp_list[mycpuid], la_le, nla) { 184 if (la->la_rt->rt_expire && la->la_rt->rt_expire <= time_second) 185 arptfree(la); 186 } 187 callout_reset(&arptimer_ch[mycpuid], arpt_prune * hz, arptimer, NULL); 188 crit_exit(); 189 } 190 191 /* 192 * Parallel to llc_rtrequest. 193 * 194 * Called after a route is successfully added to the tree to fix-up the 195 * route and initiate arp operations if required. 196 */ 197 static void 198 arp_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info) 199 { 200 struct sockaddr *gate = rt->rt_gateway; 201 struct llinfo_arp *la = rt->rt_llinfo; 202 203 struct sockaddr_dl null_sdl = { sizeof null_sdl, AF_LINK }; 204 static boolean_t arpinit_done[MAXCPU]; 205 206 if (!arpinit_done[mycpuid]) { 207 arpinit_done[mycpuid] = TRUE; 208 callout_init(&arptimer_ch[mycpuid]); 209 callout_reset(&arptimer_ch[mycpuid], hz, arptimer, NULL); 210 } 211 if (rt->rt_flags & RTF_GATEWAY) 212 return; 213 214 switch (req) { 215 case RTM_ADD: 216 /* 217 * XXX: If this is a manually added route to interface 218 * such as older version of routed or gated might provide, 219 * restore cloning bit. 220 */ 221 if (!(rt->rt_flags & RTF_HOST) && 222 SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 223 rt->rt_flags |= RTF_CLONING; 224 if (rt->rt_flags & RTF_CLONING) { 225 /* 226 * Case 1: This route should come from a route to iface. 227 */ 228 rt_setgate(rt, rt_key(rt), 229 (struct sockaddr *)&null_sdl, 230 RTL_DONTREPORT); 231 gate = rt->rt_gateway; 232 SDL(gate)->sdl_type = rt->rt_ifp->if_type; 233 SDL(gate)->sdl_index = rt->rt_ifp->if_index; 234 rt->rt_expire = time_second; 235 break; 236 } 237 /* Announce a new entry if requested. */ 238 if (rt->rt_flags & RTF_ANNOUNCE) { 239 arprequest_async(rt->rt_ifp, 240 &SIN(rt_key(rt))->sin_addr, 241 &SIN(rt_key(rt))->sin_addr, 242 LLADDR(SDL(gate))); 243 } 244 /*FALLTHROUGH*/ 245 case RTM_RESOLVE: 246 if (gate->sa_family != AF_LINK || 247 gate->sa_len < sizeof(struct sockaddr_dl)) { 248 log(LOG_DEBUG, "arp_rtrequest: bad gateway value\n"); 249 break; 250 } 251 SDL(gate)->sdl_type = rt->rt_ifp->if_type; 252 SDL(gate)->sdl_index = rt->rt_ifp->if_index; 253 if (la != NULL) 254 break; /* This happens on a route change */ 255 /* 256 * Case 2: This route may come from cloning, or a manual route 257 * add with a LL address. 258 */ 259 R_Malloc(la, struct llinfo_arp *, sizeof *la); 260 rt->rt_llinfo = la; 261 if (la == NULL) { 262 log(LOG_DEBUG, "arp_rtrequest: malloc failed\n"); 263 break; 264 } 265 bzero(la, sizeof *la); 266 la->la_rt = rt; 267 rt->rt_flags |= RTF_LLINFO; 268 LIST_INSERT_HEAD(&llinfo_arp_list[mycpuid], la, la_le); 269 270 #ifdef INET 271 /* 272 * This keeps the multicast addresses from showing up 273 * in `arp -a' listings as unresolved. It's not actually 274 * functional. Then the same for broadcast. 275 */ 276 if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr))) { 277 ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr, 278 LLADDR(SDL(gate))); 279 SDL(gate)->sdl_alen = 6; 280 rt->rt_expire = 0; 281 } 282 if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) { 283 memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr, 284 rt->rt_ifp->if_addrlen); 285 SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen; 286 rt->rt_expire = 0; 287 } 288 #endif 289 290 /* 291 * This fixes up the routing interface for local addresses. 292 * The route is adjusted to point at lo0 and the expiration 293 * timer is disabled. 294 * 295 * NOTE: This prevents locally targetted traffic from going 296 * out the hardware interface, which is inefficient 297 * and might not work if the hardware cannot listen 298 * to its own transmitted packets. Setting 299 * net.link.ether.inet.useloopback to 0 will force 300 * packets for local addresses out the hardware (and 301 * it is expected to receive its own packet). 302 * 303 * XXX We should just be able to test RTF_LOCAL here instead 304 * of having to compare IPs. 305 */ 306 if (SIN(rt_key(rt))->sin_addr.s_addr == 307 (IA_SIN(rt->rt_ifa))->sin_addr.s_addr) { 308 rt->rt_expire = 0; 309 bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)), 310 SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen); 311 if (useloopback) 312 rt->rt_ifp = loif; 313 } 314 break; 315 316 case RTM_DELETE: 317 if (la == NULL) 318 break; 319 LIST_REMOVE(la, la_le); 320 rt->rt_llinfo = NULL; 321 rt->rt_flags &= ~RTF_LLINFO; 322 if (la->la_hold != NULL) 323 m_freem(la->la_hold); 324 Free(la); 325 break; 326 } 327 } 328 329 static struct mbuf * 330 arpreq_alloc(struct ifnet *ifp, const struct in_addr *sip, 331 const struct in_addr *tip, const u_char *enaddr) 332 { 333 struct mbuf *m; 334 struct arphdr *ah; 335 u_short ar_hrd; 336 337 if ((m = m_gethdr(MB_DONTWAIT, MT_DATA)) == NULL) 338 return NULL; 339 m->m_pkthdr.rcvif = NULL; 340 341 switch (ifp->if_type) { 342 case IFT_ETHER: 343 /* 344 * This may not be correct for types not explicitly 345 * listed, but this is our best guess 346 */ 347 default: 348 ar_hrd = htons(ARPHRD_ETHER); 349 350 m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 351 m->m_pkthdr.len = m->m_len; 352 MH_ALIGN(m, m->m_len); 353 354 ah = mtod(m, struct arphdr *); 355 break; 356 } 357 358 ah->ar_hrd = ar_hrd; 359 ah->ar_pro = htons(ETHERTYPE_IP); 360 ah->ar_hln = ifp->if_addrlen; /* hardware address length */ 361 ah->ar_pln = sizeof(struct in_addr); /* protocol address length */ 362 ah->ar_op = htons(ARPOP_REQUEST); 363 memcpy(ar_sha(ah), enaddr, ah->ar_hln); 364 memset(ar_tha(ah), 0, ah->ar_hln); 365 memcpy(ar_spa(ah), sip, ah->ar_pln); 366 memcpy(ar_tpa(ah), tip, ah->ar_pln); 367 368 return m; 369 } 370 371 static void 372 arpreq_send(struct ifnet *ifp, struct mbuf *m) 373 { 374 struct sockaddr sa; 375 struct ether_header *eh; 376 377 switch (ifp->if_type) { 378 case IFT_ETHER: 379 /* 380 * This may not be correct for types not explicitly 381 * listed, but this is our best guess 382 */ 383 default: 384 eh = (struct ether_header *)sa.sa_data; 385 /* if_output() will not swap */ 386 eh->ether_type = htons(ETHERTYPE_ARP); 387 memcpy(eh->ether_dhost, ifp->if_broadcastaddr, ifp->if_addrlen); 388 break; 389 } 390 391 sa.sa_family = AF_UNSPEC; 392 sa.sa_len = sizeof(sa); 393 ifp->if_output(ifp, m, &sa, NULL); 394 } 395 396 static void 397 arpreq_send_handler(netmsg_t msg) 398 { 399 struct mbuf *m = msg->packet.nm_packet; 400 struct ifnet *ifp = msg->lmsg.u.ms_resultp; 401 402 arpreq_send(ifp, m); 403 /* nmsg was embedded in the mbuf, do not reply! */ 404 } 405 406 /* 407 * Broadcast an ARP request. Caller specifies: 408 * - arp header source ip address 409 * - arp header target ip address 410 * - arp header source ethernet address 411 * 412 * NOTE: Caller MUST NOT hold ifp's serializer 413 */ 414 static void 415 arprequest(struct ifnet *ifp, const struct in_addr *sip, 416 const struct in_addr *tip, const u_char *enaddr) 417 { 418 struct mbuf *m; 419 420 if (enaddr == NULL) { 421 if (ifp->if_bridge) { 422 enaddr = IF_LLADDR(ether_bridge_interface(ifp)); 423 } else { 424 enaddr = IF_LLADDR(ifp); 425 } 426 } 427 428 m = arpreq_alloc(ifp, sip, tip, enaddr); 429 if (m == NULL) 430 return; 431 arpreq_send(ifp, m); 432 } 433 434 /* 435 * Same as arprequest(), except: 436 * - Caller is allowed to hold ifp's serializer 437 * - Network output is done in protocol thead 438 */ 439 static void 440 arprequest_async(struct ifnet *ifp, const struct in_addr *sip, 441 const struct in_addr *tip, const u_char *enaddr) 442 { 443 struct mbuf *m; 444 struct netmsg_packet *pmsg; 445 446 if (enaddr == NULL) { 447 if (ifp->if_bridge) { 448 enaddr = IF_LLADDR(ether_bridge_interface(ifp)); 449 } else { 450 enaddr = IF_LLADDR(ifp); 451 } 452 } 453 m = arpreq_alloc(ifp, sip, tip, enaddr); 454 if (m == NULL) 455 return; 456 457 pmsg = &m->m_hdr.mh_netmsg; 458 netmsg_init(&pmsg->base, NULL, &netisr_apanic_rport, 459 0, arpreq_send_handler); 460 pmsg->nm_packet = m; 461 pmsg->base.lmsg.u.ms_resultp = ifp; 462 463 lwkt_sendmsg(netisr_portfn(mycpuid), &pmsg->base.lmsg); 464 } 465 466 /* 467 * Resolve an IP address into an ethernet address. If success, 468 * desten is filled in. If there is no entry in arptab, 469 * set one up and broadcast a request for the IP address. 470 * Hold onto this mbuf and resend it once the address 471 * is finally resolved. A return value of 1 indicates 472 * that desten has been filled in and the packet should be sent 473 * normally; a 0 return indicates that the packet has been 474 * taken over here, either now or for later transmission. 475 */ 476 int 477 arpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 478 struct sockaddr *dst, u_char *desten) 479 { 480 struct rtentry *rt; 481 struct llinfo_arp *la = NULL; 482 struct sockaddr_dl *sdl; 483 484 if (m->m_flags & M_BCAST) { /* broadcast */ 485 memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen); 486 return (1); 487 } 488 if (m->m_flags & M_MCAST) {/* multicast */ 489 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten); 490 return (1); 491 } 492 if (rt0 != NULL) { 493 if (rt_llroute(dst, rt0, &rt) != 0) { 494 m_freem(m); 495 return 0; 496 } 497 la = rt->rt_llinfo; 498 } 499 if (la == NULL) { 500 la = arplookup(SIN(dst)->sin_addr.s_addr, 501 TRUE, RTL_REPORTMSG, FALSE); 502 if (la != NULL) 503 rt = la->la_rt; 504 } 505 if (la == NULL || rt == NULL) { 506 log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n", 507 inet_ntoa(SIN(dst)->sin_addr), la ? "la" : " ", 508 rt ? "rt" : ""); 509 m_freem(m); 510 return (0); 511 } 512 sdl = SDL(rt->rt_gateway); 513 /* 514 * Check the address family and length is valid, the address 515 * is resolved; otherwise, try to resolve. 516 */ 517 if ((rt->rt_expire == 0 || rt->rt_expire > time_second) && 518 sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) { 519 /* 520 * If entry has an expiry time and it is approaching, 521 * see if we need to send an ARP request within this 522 * arpt_down interval. 523 */ 524 if ((rt->rt_expire != 0) && 525 (time_second + la->la_preempt > rt->rt_expire)) { 526 arprequest(ifp, 527 &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 528 &SIN(dst)->sin_addr, 529 NULL); 530 la->la_preempt--; 531 } 532 533 bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 534 return 1; 535 } 536 /* 537 * If ARP is disabled or static on this interface, stop. 538 * XXX 539 * Probably should not allocate empty llinfo struct if we are 540 * not going to be sending out an arp request. 541 */ 542 if (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) { 543 m_freem(m); 544 return (0); 545 } 546 /* 547 * There is an arptab entry, but no ethernet address 548 * response yet. Replace the held mbuf with this 549 * latest one. 550 */ 551 if (la->la_hold != NULL) 552 m_freem(la->la_hold); 553 la->la_hold = m; 554 la->la_msgport = cur_netport(); 555 if (rt->rt_expire || ((rt->rt_flags & RTF_STATIC) && !sdl->sdl_alen)) { 556 rt->rt_flags &= ~RTF_REJECT; 557 if (la->la_asked == 0 || rt->rt_expire != time_second) { 558 rt->rt_expire = time_second; 559 if (la->la_asked++ < arp_maxtries) { 560 arprequest(ifp, 561 &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 562 &SIN(dst)->sin_addr, 563 NULL); 564 } else { 565 rt->rt_flags |= RTF_REJECT; 566 rt->rt_expire += arpt_down; 567 la->la_asked = 0; 568 la->la_preempt = arp_maxtries; 569 } 570 } 571 } 572 return (0); 573 } 574 575 /* 576 * Common length and type checks are done here, 577 * then the protocol-specific routine is called. 578 */ 579 static void 580 arpintr(netmsg_t msg) 581 { 582 struct mbuf *m = msg->packet.nm_packet; 583 struct arphdr *ar; 584 u_short ar_hrd; 585 586 if (m->m_len < sizeof(struct arphdr) && 587 (m = m_pullup(m, sizeof(struct arphdr))) == NULL) { 588 log(LOG_ERR, "arp: runt packet -- m_pullup failed\n"); 589 return; 590 } 591 ar = mtod(m, struct arphdr *); 592 593 ar_hrd = ntohs(ar->ar_hrd); 594 if (ar_hrd != ARPHRD_ETHER && ar_hrd != ARPHRD_IEEE802) { 595 log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n", 596 (unsigned char *)&ar->ar_hrd, ""); 597 m_freem(m); 598 return; 599 } 600 601 if (m->m_pkthdr.len < arphdr_len(ar)) { 602 if ((m = m_pullup(m, arphdr_len(ar))) == NULL) { 603 log(LOG_ERR, "arp: runt packet\n"); 604 return; 605 } 606 ar = mtod(m, struct arphdr *); 607 } 608 609 switch (ntohs(ar->ar_pro)) { 610 #ifdef INET 611 case ETHERTYPE_IP: 612 in_arpinput(m); 613 return; 614 #endif 615 } 616 m_freem(m); 617 /* msg was embedded in the mbuf, do not reply! */ 618 } 619 620 #ifdef INET 621 /* 622 * ARP for Internet protocols on 10 Mb/s Ethernet. 623 * Algorithm is that given in RFC 826. 624 * In addition, a sanity check is performed on the sender 625 * protocol address, to catch impersonators. 626 * We no longer handle negotiations for use of trailer protocol: 627 * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent 628 * along with IP replies if we wanted trailers sent to us, 629 * and also sent them in response to IP replies. 630 * This allowed either end to announce the desire to receive 631 * trailer packets. 632 * We no longer reply to requests for ETHERTYPE_TRAIL protocol either, 633 * but formerly didn't normally send requests. 634 */ 635 636 static int log_arp_wrong_iface = 1; 637 static int log_arp_movements = 1; 638 static int log_arp_permanent_modify = 1; 639 640 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW, 641 &log_arp_wrong_iface, 0, 642 "Log arp packets arriving on the wrong interface"); 643 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW, 644 &log_arp_movements, 0, 645 "Log arp replies from MACs different than the one in the cache"); 646 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_permanent_modify, CTLFLAG_RW, 647 &log_arp_permanent_modify, 0, 648 "Log arp replies from MACs different than the one " 649 "in the permanent arp entry"); 650 651 652 static void 653 arp_hold_output(netmsg_t msg) 654 { 655 struct mbuf *m = msg->packet.nm_packet; 656 struct rtentry *rt; 657 struct ifnet *ifp; 658 659 rt = msg->lmsg.u.ms_resultp; 660 ifp = m->m_pkthdr.rcvif; 661 m->m_pkthdr.rcvif = NULL; 662 663 ifp->if_output(ifp, m, rt_key(rt), rt); 664 665 /* Drop the reference count bumped by the sender */ 666 RTFREE(rt); 667 668 /* nmsg was embedded in the mbuf, do not reply! */ 669 } 670 671 static void 672 arp_update_oncpu(struct mbuf *m, in_addr_t saddr, boolean_t create, 673 boolean_t generate_report, boolean_t dologging) 674 { 675 struct arphdr *ah = mtod(m, struct arphdr *); 676 struct ifnet *ifp = m->m_pkthdr.rcvif; 677 struct llinfo_arp *la; 678 struct sockaddr_dl *sdl; 679 struct rtentry *rt; 680 681 la = arplookup(saddr, create, generate_report, FALSE); 682 if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) { 683 struct in_addr isaddr = { saddr }; 684 685 /* 686 * Normally arps coming in on the wrong interface are ignored, 687 * but if we are bridging and the two interfaces belong to 688 * the same bridge, or one is a member of the bridge which 689 * is the other, then it isn't an error. 690 */ 691 if (rt->rt_ifp != ifp) { 692 /* 693 * (1) ifp and rt_ifp both members of same bridge 694 * (2) rt_ifp member of bridge ifp 695 * (3) ifp member of bridge rt_ifp 696 * 697 * Always replace rt_ifp with the bridge ifc. 698 */ 699 struct ifnet *nifp; 700 701 if (ifp->if_bridge && 702 rt->rt_ifp->if_bridge == ifp->if_bridge) { 703 nifp = ether_bridge_interface(ifp); 704 } else if (rt->rt_ifp->if_bridge && 705 ether_bridge_interface(rt->rt_ifp) == ifp) { 706 nifp = ifp; 707 } else if (ifp->if_bridge && 708 ether_bridge_interface(ifp) == rt->rt_ifp) { 709 nifp = rt->rt_ifp; 710 } else { 711 nifp = NULL; 712 } 713 714 if ((log_arp_wrong_iface == 1 && nifp == NULL) || 715 log_arp_wrong_iface == 2) { 716 log(LOG_ERR, 717 "arp: %s is on %s " 718 "but got reply from %*D on %s\n", 719 inet_ntoa(isaddr), 720 rt->rt_ifp->if_xname, 721 ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 722 ifp->if_xname); 723 } 724 if (nifp == NULL) 725 return; 726 727 /* 728 * nifp is our man! Replace rt_ifp and adjust 729 * the sdl. 730 */ 731 ifp = rt->rt_ifp = nifp; 732 sdl->sdl_type = ifp->if_type; 733 sdl->sdl_index = ifp->if_index; 734 } 735 if (sdl->sdl_alen && 736 bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) { 737 if (rt->rt_expire != 0) { 738 if (dologging && log_arp_movements) { 739 log(LOG_INFO, 740 "arp: %s moved from %*D to %*D on %s\n", 741 inet_ntoa(isaddr), 742 ifp->if_addrlen, (u_char *)LLADDR(sdl), 743 ":", ifp->if_addrlen, 744 (u_char *)ar_sha(ah), ":", 745 ifp->if_xname); 746 } 747 } else { 748 if (dologging && log_arp_permanent_modify) { 749 log(LOG_ERR, 750 "arp: %*D attempts to modify " 751 "permanent entry for %s on %s\n", 752 ifp->if_addrlen, (u_char *)ar_sha(ah), 753 ":", inet_ntoa(isaddr), ifp->if_xname); 754 } 755 return; 756 } 757 } 758 /* 759 * sanity check for the address length. 760 * XXX this does not work for protocols with variable address 761 * length. -is 762 */ 763 if (dologging && sdl->sdl_alen && sdl->sdl_alen != ah->ar_hln) { 764 log(LOG_WARNING, 765 "arp from %*D: new addr len %d, was %d", 766 ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 767 ah->ar_hln, sdl->sdl_alen); 768 } 769 if (ifp->if_addrlen != ah->ar_hln) { 770 if (dologging) { 771 log(LOG_WARNING, 772 "arp from %*D: addr len: new %d, i/f %d " 773 "(ignored)", 774 ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 775 ah->ar_hln, ifp->if_addrlen); 776 } 777 return; 778 } 779 memcpy(LLADDR(sdl), ar_sha(ah), sdl->sdl_alen = ah->ar_hln); 780 if (rt->rt_expire != 0) { 781 rt->rt_expire = time_second + arpt_keep; 782 } 783 rt->rt_flags &= ~RTF_REJECT; 784 la->la_asked = 0; 785 la->la_preempt = arp_maxtries; 786 787 /* 788 * This particular cpu might have been holding an mbuf 789 * pending ARP resolution. If so, transmit the mbuf now. 790 */ 791 if (la->la_hold != NULL) { 792 struct mbuf *m = la->la_hold; 793 struct lwkt_port *port = la->la_msgport; 794 struct netmsg_packet *pmsg; 795 796 la->la_hold = NULL; 797 la->la_msgport = NULL; 798 799 m_adj(m, sizeof(struct ether_header)); 800 801 /* 802 * Make sure that this rtentry will not be freed 803 * before the packet is processed on the target 804 * msgport. The reference count will be dropped 805 * in the handler associated with this packet. 806 */ 807 rt->rt_refcnt++; 808 809 pmsg = &m->m_hdr.mh_netmsg; 810 netmsg_init(&pmsg->base, NULL, 811 &netisr_apanic_rport, 812 MSGF_PRIORITY, arp_hold_output); 813 pmsg->nm_packet = m; 814 815 /* Record necessary information */ 816 m->m_pkthdr.rcvif = ifp; 817 pmsg->base.lmsg.u.ms_resultp = rt; 818 819 lwkt_sendmsg(port, &pmsg->base.lmsg); 820 } 821 } 822 } 823 824 struct netmsg_arp_update { 825 struct netmsg_base base; 826 struct mbuf *m; 827 in_addr_t saddr; 828 boolean_t create; 829 }; 830 831 static void arp_update_msghandler(netmsg_t msg); 832 833 /* 834 * Called from arpintr() - this routine is run from a single cpu. 835 */ 836 static void 837 in_arpinput(struct mbuf *m) 838 { 839 struct arphdr *ah; 840 struct ifnet *ifp = m->m_pkthdr.rcvif; 841 struct ether_header *eh; 842 struct rtentry *rt; 843 struct ifaddr_container *ifac; 844 struct in_ifaddr_container *iac; 845 struct in_ifaddr *ia = NULL; 846 struct sockaddr sa; 847 struct in_addr isaddr, itaddr, myaddr; 848 struct netmsg_arp_update msg; 849 uint8_t *enaddr = NULL; 850 int op; 851 int req_len; 852 853 req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 854 if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) { 855 log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n"); 856 return; 857 } 858 859 ah = mtod(m, struct arphdr *); 860 op = ntohs(ah->ar_op); 861 memcpy(&isaddr, ar_spa(ah), sizeof isaddr); 862 memcpy(&itaddr, ar_tpa(ah), sizeof itaddr); 863 864 /* 865 * Check both target and sender IP addresses: 866 * 867 * If we receive the packet on the interface owning the address, 868 * then accept the address. 869 * 870 * For a bridge, we accept the address if the receive interface and 871 * the interface owning the address are on the same bridge, and 872 * use the bridge MAC as the is-at response. The bridge will be 873 * responsible for handling the packet. 874 * 875 * (0) Check target IP against CARP IPs 876 */ 877 #ifdef CARP 878 LIST_FOREACH(iac, INADDR_HASH(itaddr.s_addr), ia_hash) { 879 int is_match = 0, is_parent = 0; 880 881 ia = iac->ia; 882 883 /* Skip all ia's which don't match */ 884 if (itaddr.s_addr != ia->ia_addr.sin_addr.s_addr) 885 continue; 886 887 if (ia->ia_ifp->if_type != IFT_CARP) 888 continue; 889 890 if (carp_parent(ia->ia_ifp) == ifp) 891 is_parent = 1; 892 if (is_parent || ia->ia_ifp == ifp) 893 is_match = carp_iamatch(ia); 894 895 if (is_match) { 896 if (is_parent) { 897 /* 898 * The parent interface will also receive 899 * the ethernet broadcast packets, e.g. ARP 900 * REQUEST, so if we could find a CARP 901 * interface of the parent that could match 902 * the target IP address, we then drop the 903 * packets, which is delieverd to us through 904 * the parent interface. 905 */ 906 m_freem(m); 907 return; 908 } 909 goto match; 910 } 911 } 912 #endif /* CARP */ 913 914 /* 915 * (1) Check target IP against our local IPs 916 */ 917 LIST_FOREACH(iac, INADDR_HASH(itaddr.s_addr), ia_hash) { 918 ia = iac->ia; 919 920 /* Skip all ia's which don't match */ 921 if (itaddr.s_addr != ia->ia_addr.sin_addr.s_addr) 922 continue; 923 924 #ifdef CARP 925 /* CARP interfaces are checked in (0) */ 926 if (ia->ia_ifp->if_type == IFT_CARP) 927 continue; 928 #endif 929 930 if (ifp->if_bridge && ia->ia_ifp && 931 ifp->if_bridge == ia->ia_ifp->if_bridge) { 932 ifp = ether_bridge_interface(ifp); 933 goto match; 934 } 935 if (ia->ia_ifp && ia->ia_ifp->if_bridge && 936 ether_bridge_interface(ia->ia_ifp) == ifp) { 937 goto match; 938 } 939 if (ifp->if_bridge && ether_bridge_interface(ifp) == 940 ia->ia_ifp) { 941 goto match; 942 } 943 if (ia->ia_ifp == ifp) { 944 goto match; 945 } 946 } 947 948 /* 949 * (2) Check sender IP against our local IPs 950 */ 951 LIST_FOREACH(iac, INADDR_HASH(isaddr.s_addr), ia_hash) { 952 ia = iac->ia; 953 954 /* Skip all ia's which don't match */ 955 if (isaddr.s_addr != ia->ia_addr.sin_addr.s_addr) 956 continue; 957 958 if (ifp->if_bridge && ia->ia_ifp && 959 ifp->if_bridge == ia->ia_ifp->if_bridge) { 960 ifp = ether_bridge_interface(ifp); 961 goto match; 962 } 963 if (ia->ia_ifp && ia->ia_ifp->if_bridge && 964 ether_bridge_interface(ia->ia_ifp) == ifp) { 965 goto match; 966 } 967 if (ifp->if_bridge && ether_bridge_interface(ifp) == 968 ia->ia_ifp) { 969 goto match; 970 } 971 972 if (ia->ia_ifp == ifp) 973 goto match; 974 } 975 976 /* 977 * No match, use the first inet address on the receive interface 978 * as a dummy address for the rest of the function. 979 */ 980 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { 981 struct ifaddr *ifa = ifac->ifa; 982 983 if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 984 ia = ifatoia(ifa); 985 goto match; 986 } 987 } 988 989 /* 990 * If we got here, we didn't find any suitable interface, 991 * so drop the packet. 992 */ 993 m_freem(m); 994 return; 995 996 match: 997 if (!enaddr) 998 enaddr = (uint8_t *)IF_LLADDR(ifp); 999 myaddr = ia->ia_addr.sin_addr; 1000 if (!bcmp(ar_sha(ah), enaddr, ifp->if_addrlen)) { 1001 m_freem(m); /* it's from me, ignore it. */ 1002 return; 1003 } 1004 if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) { 1005 log(LOG_ERR, 1006 "arp: link address is broadcast for IP address %s!\n", 1007 inet_ntoa(isaddr)); 1008 m_freem(m); 1009 return; 1010 } 1011 if (isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) { 1012 log(LOG_ERR, 1013 "arp: %*D is using my IP address %s!\n", 1014 ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 1015 inet_ntoa(isaddr)); 1016 itaddr = myaddr; 1017 goto reply; 1018 } 1019 if (ifp->if_flags & IFF_STATICARP) 1020 goto reply; 1021 1022 /* 1023 * When arp_restricted_match is true and the ARP response is not 1024 * specifically targetted to me, ignore it. Otherwise the entry 1025 * timeout may be updated for an old MAC. 1026 */ 1027 if (arp_restricted_match && itaddr.s_addr != myaddr.s_addr) { 1028 m_freem(m); 1029 return; 1030 } 1031 1032 netmsg_init(&msg.base, NULL, &curthread->td_msgport, 1033 0, arp_update_msghandler); 1034 msg.m = m; 1035 msg.saddr = isaddr.s_addr; 1036 msg.create = (itaddr.s_addr == myaddr.s_addr); 1037 lwkt_domsg(rtable_portfn(0), &msg.base.lmsg, 0); 1038 reply: 1039 if (op != ARPOP_REQUEST) { 1040 m_freem(m); 1041 return; 1042 } 1043 if (itaddr.s_addr == myaddr.s_addr) { 1044 /* I am the target */ 1045 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 1046 memcpy(ar_sha(ah), enaddr, ah->ar_hln); 1047 } else { 1048 struct llinfo_arp *la; 1049 1050 la = arplookup(itaddr.s_addr, FALSE, RTL_DONTREPORT, SIN_PROXY); 1051 if (la == NULL) { 1052 struct sockaddr_in sin; 1053 1054 if (!arp_proxyall) { 1055 m_freem(m); 1056 return; 1057 } 1058 1059 bzero(&sin, sizeof sin); 1060 sin.sin_family = AF_INET; 1061 sin.sin_len = sizeof sin; 1062 sin.sin_addr = itaddr; 1063 1064 rt = rtpurelookup((struct sockaddr *)&sin); 1065 if (rt == NULL) { 1066 m_freem(m); 1067 return; 1068 } 1069 --rt->rt_refcnt; 1070 /* 1071 * Don't send proxies for nodes on the same interface 1072 * as this one came out of, or we'll get into a fight 1073 * over who claims what Ether address. 1074 */ 1075 if (rt->rt_ifp == ifp) { 1076 m_freem(m); 1077 return; 1078 } 1079 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 1080 memcpy(ar_sha(ah), enaddr, ah->ar_hln); 1081 #ifdef DEBUG_PROXY 1082 kprintf("arp: proxying for %s\n", inet_ntoa(itaddr)); 1083 #endif 1084 } else { 1085 struct sockaddr_dl *sdl; 1086 1087 rt = la->la_rt; 1088 memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 1089 sdl = SDL(rt->rt_gateway); 1090 memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln); 1091 } 1092 } 1093 1094 memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln); 1095 memcpy(ar_spa(ah), &itaddr, ah->ar_pln); 1096 ah->ar_op = htons(ARPOP_REPLY); 1097 ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */ 1098 switch (ifp->if_type) { 1099 case IFT_ETHER: 1100 /* 1101 * May not be correct for types not explictly 1102 * listed, but it is our best guess. 1103 */ 1104 default: 1105 eh = (struct ether_header *)sa.sa_data; 1106 memcpy(eh->ether_dhost, ar_tha(ah), sizeof eh->ether_dhost); 1107 eh->ether_type = htons(ETHERTYPE_ARP); 1108 break; 1109 } 1110 sa.sa_family = AF_UNSPEC; 1111 sa.sa_len = sizeof sa; 1112 ifp->if_output(ifp, m, &sa, NULL); 1113 } 1114 1115 static void 1116 arp_update_msghandler(netmsg_t msg) 1117 { 1118 struct netmsg_arp_update *rmsg = (struct netmsg_arp_update *)msg; 1119 int nextcpu; 1120 1121 /* 1122 * This message handler will be called on all of the CPUs, 1123 * however, we only need to generate rtmsg on CPU0. 1124 */ 1125 arp_update_oncpu(rmsg->m, rmsg->saddr, rmsg->create, 1126 mycpuid == 0 ? RTL_REPORTMSG : RTL_DONTREPORT, 1127 mycpuid == 0); 1128 1129 nextcpu = mycpuid + 1; 1130 if (nextcpu < ncpus) 1131 lwkt_forwardmsg(rtable_portfn(nextcpu), &rmsg->base.lmsg); 1132 else 1133 lwkt_replymsg(&rmsg->base.lmsg, 0); 1134 } 1135 1136 #endif /* INET */ 1137 1138 /* 1139 * Free an arp entry. If the arp entry is actively referenced or represents 1140 * a static entry we only clear it back to an unresolved state, otherwise 1141 * we destroy the entry entirely. 1142 * 1143 * Note that static entries are created when route add ... -interface is used 1144 * to create an interface route to a (direct) destination. 1145 */ 1146 static void 1147 arptfree(struct llinfo_arp *la) 1148 { 1149 struct rtentry *rt = la->la_rt; 1150 struct sockaddr_dl *sdl; 1151 1152 if (rt == NULL) 1153 panic("arptfree"); 1154 sdl = SDL(rt->rt_gateway); 1155 if (sdl != NULL && 1156 ((rt->rt_refcnt > 0 && sdl->sdl_family == AF_LINK) || 1157 (rt->rt_flags & RTF_STATIC))) { 1158 sdl->sdl_alen = 0; 1159 la->la_preempt = la->la_asked = 0; 1160 rt->rt_flags &= ~RTF_REJECT; 1161 return; 1162 } 1163 rtrequest(RTM_DELETE, rt_key(rt), NULL, rt_mask(rt), 0, NULL); 1164 } 1165 1166 /* 1167 * Lookup or enter a new address in arptab. 1168 */ 1169 static struct llinfo_arp * 1170 arplookup(in_addr_t addr, boolean_t create, boolean_t generate_report, 1171 boolean_t proxy) 1172 { 1173 struct rtentry *rt; 1174 struct sockaddr_inarp sin = { sizeof sin, AF_INET }; 1175 const char *why = NULL; 1176 1177 sin.sin_addr.s_addr = addr; 1178 sin.sin_other = proxy ? SIN_PROXY : 0; 1179 if (create) { 1180 rt = _rtlookup((struct sockaddr *)&sin, 1181 generate_report, RTL_DOCLONE); 1182 } else { 1183 rt = rtpurelookup((struct sockaddr *)&sin); 1184 } 1185 if (rt == NULL) 1186 return (NULL); 1187 rt->rt_refcnt--; 1188 1189 if (rt->rt_flags & RTF_GATEWAY) 1190 why = "host is not on local network"; 1191 else if (!(rt->rt_flags & RTF_LLINFO)) 1192 why = "could not allocate llinfo"; 1193 else if (rt->rt_gateway->sa_family != AF_LINK) 1194 why = "gateway route is not ours"; 1195 1196 if (why) { 1197 if (create) { 1198 log(LOG_DEBUG, "arplookup %s failed: %s\n", 1199 inet_ntoa(sin.sin_addr), why); 1200 } 1201 if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_WASCLONED)) { 1202 /* No references to this route. Purge it. */ 1203 rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, 1204 rt_mask(rt), rt->rt_flags, NULL); 1205 } 1206 return (NULL); 1207 } 1208 return (rt->rt_llinfo); 1209 } 1210 1211 void 1212 arp_ifinit(struct ifnet *ifp, struct ifaddr *ifa) 1213 { 1214 ifa->ifa_rtrequest = arp_rtrequest; 1215 ifa->ifa_flags |= RTF_CLONING; 1216 } 1217 1218 void 1219 arp_gratuitous(struct ifnet *ifp, struct ifaddr *ifa) 1220 { 1221 if (IA_SIN(ifa)->sin_addr.s_addr != INADDR_ANY) { 1222 arprequest_async(ifp, &IA_SIN(ifa)->sin_addr, 1223 &IA_SIN(ifa)->sin_addr, NULL); 1224 } 1225 } 1226 1227 static void 1228 arp_ifaddr(void *arg __unused, struct ifnet *ifp, 1229 enum ifaddr_event event, struct ifaddr *ifa) 1230 { 1231 if (ifa->ifa_rtrequest != arp_rtrequest) /* XXX need a generic way */ 1232 return; 1233 if (ifa->ifa_addr->sa_family != AF_INET) 1234 return; 1235 if (event == IFADDR_EVENT_DELETE) 1236 return; 1237 1238 /* 1239 * - CARP interfaces will take care of gratuitous ARP themselves. 1240 * - If we are the CARP interface's parent, don't send gratuitous 1241 * ARP to avoid unnecessary confusion. 1242 */ 1243 #ifdef CARP 1244 if (ifp->if_type != IFT_CARP && ifp->if_carp == NULL) 1245 #endif 1246 { 1247 arp_gratuitous(ifp, ifa); 1248 } 1249 } 1250 1251 static void 1252 arp_init(void) 1253 { 1254 int cpu; 1255 1256 for (cpu = 0; cpu < ncpus2; cpu++) 1257 LIST_INIT(&llinfo_arp_list[cpu]); 1258 1259 netisr_register(NETISR_ARP, arpintr, NULL); 1260 1261 EVENTHANDLER_REGISTER(ifaddr_event, arp_ifaddr, NULL, 1262 EVENTHANDLER_PRI_LAST); 1263 } 1264 1265 SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0); 1266