if_llatbl.c revision 1.32
1 /* $NetBSD: if_llatbl.c,v 1.32 2020/09/11 15:01:26 roy Exp $ */ 2 /* 3 * Copyright (c) 2004 Luigi Rizzo, Alessandro Cerri. All rights reserved. 4 * Copyright (c) 2004-2008 Qing Li. All rights reserved. 5 * Copyright (c) 2008 Kip Macy. All rights reserved. 6 * Copyright (c) 2015 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 #include <sys/cdefs.h> 31 32 #ifdef _KERNEL_OPT 33 #include "opt_ddb.h" 34 #include "opt_inet.h" 35 #include "opt_inet6.h" 36 #include "opt_net_mpsafe.h" 37 #endif 38 39 #include "arp.h" 40 41 #include <sys/param.h> 42 #include <sys/systm.h> 43 #include <sys/malloc.h> 44 #include <sys/mbuf.h> 45 #include <sys/syslog.h> 46 #include <sys/sysctl.h> 47 #include <sys/socket.h> 48 #include <sys/socketvar.h> 49 #include <sys/kernel.h> 50 #include <sys/lock.h> 51 #include <sys/mutex.h> 52 #include <sys/rwlock.h> 53 54 #ifdef DDB 55 #include <ddb/ddb.h> 56 #endif 57 58 #include <netinet/in.h> 59 #include <net/if_llatbl.h> 60 #include <net/if.h> 61 #include <net/if_dl.h> 62 #include <net/nd.h> 63 #include <net/route.h> 64 #include <netinet/if_inarp.h> 65 #include <netinet/in_var.h> 66 #include <netinet6/in6_var.h> 67 68 static SLIST_HEAD(, lltable) lltables; 69 krwlock_t lltable_rwlock; 70 static struct pool llentry_pool; 71 72 static void lltable_unlink(struct lltable *llt); 73 static void llentries_unlink(struct lltable *llt, struct llentries *head); 74 75 static void htable_unlink_entry(struct llentry *lle); 76 static void htable_link_entry(struct lltable *llt, struct llentry *lle); 77 static int htable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f, 78 void *farg); 79 80 int 81 lltable_dump_entry(struct lltable *llt, struct llentry *lle, 82 struct rt_walkarg *w, struct sockaddr *sa) 83 { 84 #define RTF_LLINFO 0x400 85 #define RTF_CLONED 0x2000 86 struct ifnet *ifp = llt->llt_ifp; 87 int error; 88 void *a; 89 struct sockaddr_dl sdl; 90 int size; 91 struct rt_addrinfo info; 92 93 memset(&info, 0, sizeof(info)); 94 info.rti_info[RTAX_DST] = sa; 95 96 a = (lle->la_flags & LLE_VALID) == LLE_VALID ? &lle->ll_addr : NULL; 97 if (sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, ifp->if_type, 98 NULL, 0, a, ifp->if_addrlen) == NULL) 99 return EINVAL; 100 101 info.rti_info[RTAX_GATEWAY] = sstocsa(&sdl); 102 if (sa->sa_family == AF_INET && lle->la_flags & LLE_PUB) { 103 struct sockaddr_inarp *sin; 104 sin = (struct sockaddr_inarp *)sa; 105 sin->sin_other = SIN_PROXY; 106 } 107 if ((error = rt_msg3(RTM_GET, &info, 0, w, &size))) 108 return error; 109 if (w->w_where && w->w_tmem && w->w_needed <= 0) { 110 struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem; 111 112 /* Need to copy by myself */ 113 rtm->rtm_index = ifp->if_index; 114 rtm->rtm_rmx.rmx_mtu = 0; 115 rtm->rtm_rmx.rmx_expire = (lle->la_flags & LLE_STATIC) ? 0 : 116 time_mono_to_wall(lle->la_expire); 117 rtm->rtm_flags = RTF_UP; 118 rtm->rtm_flags |= RTF_HOST; /* For ndp */ 119 /* For backward compatibility */ 120 rtm->rtm_flags |= RTF_LLINFO | RTF_CLONED; 121 rtm->rtm_flags |= (lle->la_flags & LLE_STATIC) ? RTF_STATIC : 0; 122 if (lle->la_flags & LLE_PUB) 123 rtm->rtm_flags |= RTF_ANNOUNCE; 124 rtm->rtm_addrs = info.rti_addrs; 125 if ((error = copyout(rtm, w->w_where, size)) != 0) 126 w->w_where = NULL; 127 else 128 w->w_where = (char *)w->w_where + size; 129 } 130 131 return error; 132 #undef RTF_LLINFO 133 #undef RTF_CLONED 134 } 135 136 /* 137 * Dump lle state for a specific address family. 138 */ 139 static int 140 lltable_dump_af(struct lltable *llt, struct rt_walkarg *w) 141 { 142 int error; 143 144 LLTABLE_LOCK_ASSERT(); 145 146 if (llt->llt_ifp->if_flags & IFF_LOOPBACK) 147 return (0); 148 error = 0; 149 150 IF_AFDATA_RLOCK(llt->llt_ifp); 151 error = lltable_foreach_lle(llt, 152 (llt_foreach_cb_t *)llt->llt_dump_entry, w); 153 IF_AFDATA_RUNLOCK(llt->llt_ifp); 154 155 return (error); 156 } 157 158 /* 159 * Dump arp state for a specific address family. 160 */ 161 int 162 lltable_sysctl_dump(int af, struct rt_walkarg *w) 163 { 164 struct lltable *llt; 165 int error = 0; 166 167 LLTABLE_RLOCK(); 168 SLIST_FOREACH(llt, &lltables, llt_link) { 169 if (llt->llt_af == af) { 170 error = lltable_dump_af(llt, w); 171 if (error != 0) 172 goto done; 173 } 174 } 175 done: 176 LLTABLE_RUNLOCK(); 177 return (error); 178 } 179 180 /* 181 * Common function helpers for chained hash table. 182 */ 183 184 /* 185 * Runs specified callback for each entry in @llt. 186 * Caller does the locking. 187 * 188 */ 189 static int 190 htable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f, void *farg) 191 { 192 struct llentry *lle, *next; 193 int i, error; 194 195 error = 0; 196 197 for (i = 0; i < llt->llt_hsize; i++) { 198 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 199 error = f(llt, lle, farg); 200 if (error != 0) 201 break; 202 } 203 } 204 205 return (error); 206 } 207 208 static void 209 htable_link_entry(struct lltable *llt, struct llentry *lle) 210 { 211 struct llentries *lleh; 212 uint32_t hashidx; 213 214 if ((lle->la_flags & LLE_LINKED) != 0) 215 return; 216 217 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 218 219 hashidx = llt->llt_hash(lle, llt->llt_hsize); 220 lleh = &llt->lle_head[hashidx]; 221 222 lle->lle_tbl = llt; 223 lle->lle_head = lleh; 224 lle->la_flags |= LLE_LINKED; 225 LIST_INSERT_HEAD(lleh, lle, lle_next); 226 227 llt->llt_lle_count++; 228 } 229 230 static void 231 htable_unlink_entry(struct llentry *lle) 232 { 233 234 if ((lle->la_flags & LLE_LINKED) != 0) { 235 IF_AFDATA_WLOCK_ASSERT(lle->lle_tbl->llt_ifp); 236 LIST_REMOVE(lle, lle_next); 237 lle->la_flags &= ~(LLE_VALID | LLE_LINKED); 238 #if 0 239 lle->lle_tbl = NULL; 240 lle->lle_head = NULL; 241 #endif 242 KASSERTMSG(lle->lle_tbl->llt_lle_count != 0, 243 "llt_lle_count=%u", lle->lle_tbl->llt_lle_count); 244 lle->lle_tbl->llt_lle_count--; 245 } 246 } 247 248 struct prefix_match_data { 249 const struct sockaddr *prefix; 250 const struct sockaddr *mask; 251 struct llentries dchain; 252 u_int flags; 253 }; 254 255 static int 256 htable_prefix_free_cb(struct lltable *llt, struct llentry *lle, void *farg) 257 { 258 struct prefix_match_data *pmd; 259 260 pmd = (struct prefix_match_data *)farg; 261 262 if (llt->llt_match_prefix(pmd->prefix, pmd->mask, pmd->flags, lle)) { 263 LLE_WLOCK(lle); 264 LIST_INSERT_HEAD(&pmd->dchain, lle, lle_chain); 265 } 266 267 return (0); 268 } 269 270 static void 271 htable_prefix_free(struct lltable *llt, const struct sockaddr *prefix, 272 const struct sockaddr *mask, u_int flags) 273 { 274 struct llentry *lle, *next; 275 struct prefix_match_data pmd; 276 277 memset(&pmd, 0, sizeof(pmd)); 278 pmd.prefix = prefix; 279 pmd.mask = mask; 280 pmd.flags = flags; 281 LIST_INIT(&pmd.dchain); 282 283 IF_AFDATA_WLOCK(llt->llt_ifp); 284 /* Push matching lles to chain */ 285 lltable_foreach_lle(llt, htable_prefix_free_cb, &pmd); 286 287 llentries_unlink(llt, &pmd.dchain); 288 IF_AFDATA_WUNLOCK(llt->llt_ifp); 289 290 LIST_FOREACH_SAFE(lle, &pmd.dchain, lle_chain, next) 291 llt->llt_free_entry(llt, lle); 292 } 293 294 static void 295 htable_free_tbl(struct lltable *llt) 296 { 297 298 free(llt->lle_head, M_LLTABLE); 299 free(llt, M_LLTABLE); 300 } 301 302 static void 303 llentries_unlink(struct lltable *llt, struct llentries *head) 304 { 305 struct llentry *lle, *next; 306 307 LIST_FOREACH_SAFE(lle, head, lle_chain, next) 308 llt->llt_unlink_entry(lle); 309 } 310 311 /* 312 * Helper function used to drop all mbufs in hold queue. 313 * 314 * Returns the number of held packets, if any, that were dropped. 315 */ 316 size_t 317 lltable_drop_entry_queue(struct llentry *lle) 318 { 319 size_t pkts_dropped; 320 struct mbuf *next; 321 322 LLE_WLOCK_ASSERT(lle); 323 324 pkts_dropped = 0; 325 while ((lle->la_numheld > 0) && (lle->la_hold != NULL)) { 326 next = lle->la_hold->m_nextpkt; 327 m_freem(lle->la_hold); 328 lle->la_hold = next; 329 lle->la_numheld--; 330 pkts_dropped++; 331 } 332 333 KASSERTMSG(lle->la_numheld == 0, 334 "la_numheld %d > 0, pkts_droped %zd", 335 lle->la_numheld, pkts_dropped); 336 337 return (pkts_dropped); 338 } 339 340 struct llentry * 341 llentry_pool_get(int flags) 342 { 343 struct llentry *lle; 344 345 lle = pool_get(&llentry_pool, flags); 346 if (lle != NULL) 347 memset(lle, 0, sizeof(*lle)); 348 return lle; 349 } 350 351 void 352 llentry_pool_put(struct llentry *lle) 353 { 354 355 pool_put(&llentry_pool, lle); 356 } 357 358 /* 359 * Deletes an address from the address table. 360 * This function is called by the timer functions 361 * such as arptimer() and nd6_llinfo_timer(), and 362 * the caller does the locking. 363 * 364 * Returns the number of held packets, if any, that were dropped. 365 */ 366 size_t 367 llentry_free(struct llentry *lle) 368 { 369 struct lltable *llt; 370 size_t pkts_dropped; 371 372 LLE_WLOCK_ASSERT(lle); 373 374 lle->la_flags |= LLE_DELETED; 375 376 if ((lle->la_flags & LLE_LINKED) != 0) { 377 llt = lle->lle_tbl; 378 379 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 380 llt->llt_unlink_entry(lle); 381 } 382 383 /* 384 * Stop a pending callout if one exists. If we cancel one, we have to 385 * remove a reference to avoid a leak. callout_pending is required to 386 * to exclude the case that the callout has never been scheduled. 387 */ 388 /* XXX once softnet_lock goes away, we should use callout_halt */ 389 if (callout_pending(&lle->la_timer)) { 390 bool expired = callout_stop(&lle->la_timer); 391 if (!expired) 392 LLE_REMREF(lle); 393 } 394 395 pkts_dropped = lltable_drop_entry_queue(lle); 396 397 LLE_FREE_LOCKED(lle); 398 399 return (pkts_dropped); 400 } 401 402 /* 403 * (al)locate an llentry for address dst (equivalent to rtalloc for new-arp). 404 * 405 * If found the llentry * is returned referenced and unlocked. 406 */ 407 struct llentry * 408 llentry_alloc(struct ifnet *ifp, struct lltable *lt, 409 struct sockaddr_storage *dst) 410 { 411 struct llentry *la; 412 413 IF_AFDATA_RLOCK(ifp); 414 la = lla_lookup(lt, LLE_EXCLUSIVE, (struct sockaddr *)dst); 415 IF_AFDATA_RUNLOCK(ifp); 416 if ((la == NULL) && (ifp->if_flags & IFF_NOARP) == 0) { 417 IF_AFDATA_WLOCK(ifp); 418 la = lla_create(lt, 0, (struct sockaddr *)dst, NULL /* XXX */); 419 IF_AFDATA_WUNLOCK(ifp); 420 } 421 422 if (la != NULL) { 423 LLE_ADDREF(la); 424 LLE_WUNLOCK(la); 425 } 426 427 return (la); 428 } 429 430 /* 431 * Free all entries from given table and free itself. 432 */ 433 434 static int 435 lltable_free_cb(struct lltable *llt, struct llentry *lle, void *farg) 436 { 437 struct llentries *dchain; 438 439 dchain = (struct llentries *)farg; 440 441 LLE_WLOCK(lle); 442 LIST_INSERT_HEAD(dchain, lle, lle_chain); 443 444 return (0); 445 } 446 447 /* 448 * Free all entries from given table. 449 */ 450 void 451 lltable_purge_entries(struct lltable *llt) 452 { 453 struct llentry *lle, *next; 454 struct llentries dchain; 455 456 KASSERTMSG(llt != NULL, "llt is NULL"); 457 458 LIST_INIT(&dchain); 459 IF_AFDATA_WLOCK(llt->llt_ifp); 460 /* Push all lles to @dchain */ 461 lltable_foreach_lle(llt, lltable_free_cb, &dchain); 462 llentries_unlink(llt, &dchain); 463 IF_AFDATA_WUNLOCK(llt->llt_ifp); 464 465 LIST_FOREACH_SAFE(lle, &dchain, lle_chain, next) 466 (void)llentry_free(lle); 467 } 468 469 /* 470 * Free all entries from given table and free itself. 471 */ 472 void 473 lltable_free(struct lltable *llt) 474 { 475 476 KASSERTMSG(llt != NULL, "llt is NULL"); 477 478 lltable_unlink(llt); 479 lltable_purge_entries(llt); 480 llt->llt_free_tbl(llt); 481 } 482 483 void 484 lltable_drain(int af) 485 { 486 struct lltable *llt; 487 struct llentry *lle; 488 register int i; 489 490 LLTABLE_RLOCK(); 491 SLIST_FOREACH(llt, &lltables, llt_link) { 492 if (llt->llt_af != af) 493 continue; 494 495 for (i=0; i < llt->llt_hsize; i++) { 496 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 497 LLE_WLOCK(lle); 498 lltable_drop_entry_queue(lle); 499 LLE_WUNLOCK(lle); 500 } 501 } 502 } 503 LLTABLE_RUNLOCK(); 504 } 505 506 void 507 lltable_prefix_free(const int af, const struct sockaddr *prefix, 508 const struct sockaddr *mask, const u_int flags) 509 { 510 struct lltable *llt; 511 512 LLTABLE_RLOCK(); 513 SLIST_FOREACH(llt, &lltables, llt_link) { 514 if (llt->llt_af != af) 515 continue; 516 517 llt->llt_prefix_free(llt, prefix, mask, flags); 518 } 519 LLTABLE_RUNLOCK(); 520 } 521 522 struct lltable * 523 lltable_allocate_htbl(uint32_t hsize) 524 { 525 struct lltable *llt; 526 int i; 527 528 llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK | M_ZERO); 529 llt->llt_hsize = hsize; 530 llt->lle_head = malloc(sizeof(struct llentries) * hsize, 531 M_LLTABLE, M_WAITOK | M_ZERO); 532 533 for (i = 0; i < llt->llt_hsize; i++) 534 LIST_INIT(&llt->lle_head[i]); 535 536 /* Set some default callbacks */ 537 llt->llt_link_entry = htable_link_entry; 538 llt->llt_unlink_entry = htable_unlink_entry; 539 llt->llt_prefix_free = htable_prefix_free; 540 llt->llt_foreach_entry = htable_foreach_lle; 541 542 llt->llt_free_tbl = htable_free_tbl; 543 544 return (llt); 545 } 546 547 /* 548 * Links lltable to global llt list. 549 */ 550 void 551 lltable_link(struct lltable *llt) 552 { 553 554 LLTABLE_WLOCK(); 555 SLIST_INSERT_HEAD(&lltables, llt, llt_link); 556 LLTABLE_WUNLOCK(); 557 } 558 559 static void 560 lltable_unlink(struct lltable *llt) 561 { 562 563 LLTABLE_WLOCK(); 564 SLIST_REMOVE(&lltables, llt, lltable, llt_link); 565 LLTABLE_WUNLOCK(); 566 567 } 568 569 /* 570 * External methods used by lltable consumers 571 */ 572 573 int 574 lltable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f, void *farg) 575 { 576 577 return (llt->llt_foreach_entry(llt, f, farg)); 578 } 579 580 void 581 lltable_link_entry(struct lltable *llt, struct llentry *lle) 582 { 583 584 llt->llt_link_entry(llt, lle); 585 } 586 587 void 588 lltable_unlink_entry(struct lltable *llt, struct llentry *lle) 589 { 590 591 llt->llt_unlink_entry(lle); 592 } 593 594 void 595 lltable_free_entry(struct lltable *llt, struct llentry *lle) 596 { 597 598 llt->llt_free_entry(llt, lle); 599 } 600 601 void 602 lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 603 { 604 struct lltable *llt; 605 606 llt = lle->lle_tbl; 607 llt->llt_fill_sa_entry(lle, sa); 608 } 609 610 struct ifnet * 611 lltable_get_ifp(const struct lltable *llt) 612 { 613 614 return (llt->llt_ifp); 615 } 616 617 int 618 lltable_get_af(const struct lltable *llt) 619 { 620 621 return (llt->llt_af); 622 } 623 624 /* 625 * Called in route_output when rtm_flags contains RTF_LLDATA. 626 */ 627 int 628 lla_rt_output(const u_char rtm_type, const int rtm_flags, const time_t rtm_expire, 629 struct rt_addrinfo *info, int sdl_index) 630 { 631 const struct sockaddr_dl *dl = satocsdl(info->rti_info[RTAX_GATEWAY]); 632 const struct sockaddr *dst = info->rti_info[RTAX_DST]; 633 struct ifnet *ifp; 634 struct lltable *llt; 635 struct llentry *lle; 636 u_int laflags; 637 int error; 638 struct psref psref; 639 int bound; 640 641 KASSERTMSG(dl != NULL && dl->sdl_family == AF_LINK, "invalid dl"); 642 643 bound = curlwp_bind(); 644 if (sdl_index != 0) 645 ifp = if_get_byindex(sdl_index, &psref); 646 else 647 ifp = if_get_byindex(dl->sdl_index, &psref); 648 if (ifp == NULL) { 649 curlwp_bindx(bound); 650 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n", 651 __func__, sdl_index != 0 ? sdl_index : dl->sdl_index); 652 return EINVAL; 653 } 654 655 /* XXX linked list may be too expensive */ 656 LLTABLE_RLOCK(); 657 SLIST_FOREACH(llt, &lltables, llt_link) { 658 if (llt->llt_af == dst->sa_family && 659 llt->llt_ifp == ifp) 660 break; 661 } 662 LLTABLE_RUNLOCK(); 663 KASSERTMSG(llt != NULL, "Yep, ugly hacks are bad"); 664 665 error = 0; 666 667 switch (rtm_type) { 668 case RTM_ADD: { 669 struct rtentry *rt; 670 671 /* Never call rtalloc1 with IF_AFDATA_WLOCK */ 672 rt = rtalloc1(dst, 0); 673 674 /* Add static LLE */ 675 IF_AFDATA_WLOCK(ifp); 676 lle = lla_lookup(llt, LLE_EXCLUSIVE, dst); 677 678 /* Cannot overwrite an existing static entry */ 679 if (lle != NULL && 680 (lle->la_flags & LLE_STATIC || lle->la_expire == 0)) { 681 LLE_RUNLOCK(lle); 682 IF_AFDATA_WUNLOCK(ifp); 683 if (rt != NULL) 684 rt_unref(rt); 685 error = EEXIST; 686 goto out; 687 } 688 689 /* 690 * We can't overwrite an existing entry to avoid race 691 * conditions so remove it first. 692 */ 693 if (lle != NULL) { 694 #if defined(INET) && NARP > 0 695 size_t pkts_dropped = llentry_free(lle); 696 if (dst->sa_family == AF_INET) { 697 arp_stat_add(ARP_STAT_DFRDROPPED, 698 (uint64_t)pkts_dropped); 699 } 700 #else 701 (void) llentry_free(lle); 702 #endif 703 } 704 705 lle = lla_create(llt, 0, dst, rt); 706 if (lle == NULL) { 707 IF_AFDATA_WUNLOCK(ifp); 708 if (rt != NULL) 709 rt_unref(rt); 710 error = ENOMEM; 711 goto out; 712 } 713 714 KASSERT(ifp->if_addrlen <= sizeof(lle->ll_addr)); 715 memcpy(&lle->ll_addr, CLLADDR(dl), ifp->if_addrlen); 716 if ((rtm_flags & RTF_ANNOUNCE)) 717 lle->la_flags |= LLE_PUB; 718 lle->la_flags |= LLE_VALID; 719 switch (dst->sa_family) { 720 #ifdef INET6 721 case AF_INET6: 722 lle->ln_state = ND_LLINFO_REACHABLE; 723 break; 724 #endif 725 } 726 727 /* 728 * NB: arp and ndp always set (RTF_STATIC | RTF_HOST) 729 */ 730 731 if (rtm_expire == 0) { 732 lle->la_flags |= LLE_STATIC; 733 lle->la_expire = 0; 734 } else 735 lle->la_expire = rtm_expire; 736 laflags = lle->la_flags; 737 LLE_WUNLOCK(lle); 738 IF_AFDATA_WUNLOCK(ifp); 739 if (rt != NULL) 740 rt_unref(rt); 741 #if defined(INET) && NARP > 0 742 /* gratuitous ARP */ 743 if ((laflags & LLE_PUB) && dst->sa_family == AF_INET) { 744 const struct sockaddr_in *sin; 745 struct in_ifaddr *ia; 746 struct psref _psref; 747 748 sin = satocsin(dst); 749 ia = in_get_ia_on_iface_psref(sin->sin_addr, 750 ifp, &_psref); 751 if (ia != NULL) { 752 arpannounce(ifp, &ia->ia_ifa, CLLADDR(dl)); 753 ia4_release(ia, &_psref); 754 } 755 } 756 #else 757 (void)laflags; 758 #endif 759 break; 760 } 761 762 case RTM_DELETE: 763 IF_AFDATA_WLOCK(ifp); 764 error = lla_delete(llt, 0, dst); 765 IF_AFDATA_WUNLOCK(ifp); 766 error = (error == 0 ? 0 : ENOENT); 767 break; 768 769 default: 770 error = EINVAL; 771 } 772 773 out: 774 if_put(ifp, &psref); 775 curlwp_bindx(bound); 776 return (error); 777 } 778 779 void 780 lltableinit(void) 781 { 782 783 SLIST_INIT(&lltables); 784 rw_init(&lltable_rwlock); 785 786 pool_init(&llentry_pool, sizeof(struct llentry), 0, 0, 0, "llentrypl", 787 NULL, IPL_SOFTNET); 788 } 789 790 #ifdef __FreeBSD__ 791 #ifdef DDB 792 struct llentry_sa { 793 struct llentry base; 794 struct sockaddr l3_addr; 795 }; 796 797 static void 798 llatbl_lle_show(struct llentry_sa *la) 799 { 800 struct llentry *lle; 801 uint8_t octet[6]; 802 803 lle = &la->base; 804 db_printf("lle=%p\n", lle); 805 db_printf(" lle_next=%p\n", lle->lle_next.le_next); 806 db_printf(" lle_lock=%p\n", &lle->lle_lock); 807 db_printf(" lle_tbl=%p\n", lle->lle_tbl); 808 db_printf(" lle_head=%p\n", lle->lle_head); 809 db_printf(" la_hold=%p\n", lle->la_hold); 810 db_printf(" la_numheld=%d\n", lle->la_numheld); 811 db_printf(" la_expire=%ju\n", (uintmax_t)lle->la_expire); 812 db_printf(" la_flags=0x%04x\n", lle->la_flags); 813 db_printf(" la_asked=%u\n", lle->la_asked); 814 db_printf(" la_preempt=%u\n", lle->la_preempt); 815 db_printf(" ln_byhint=%u\n", lle->ln_byhint); 816 db_printf(" ln_state=%d\n", lle->ln_state); 817 db_printf(" ln_router=%u\n", lle->ln_router); 818 db_printf(" ln_ntick=%ju\n", (uintmax_t)lle->ln_ntick); 819 db_printf(" lle_refcnt=%d\n", lle->lle_refcnt); 820 memcopy(octet, &lle->ll_addr.mac16, sizeof(octet)); 821 db_printf(" ll_addr=%02x:%02x:%02x:%02x:%02x:%02x\n", 822 octet[0], octet[1], octet[2], octet[3], octet[4], octet[5]); 823 db_printf(" lle_timer=%p\n", &lle->lle_timer); 824 825 switch (la->l3_addr.sa_family) { 826 #ifdef INET 827 case AF_INET: 828 { 829 struct sockaddr_in *sin; 830 char l3s[INET_ADDRSTRLEN]; 831 832 sin = (struct sockaddr_in *)&la->l3_addr; 833 inet_ntoa_r(sin->sin_addr, l3s); 834 db_printf(" l3_addr=%s\n", l3s); 835 break; 836 } 837 #endif 838 #ifdef INET6 839 case AF_INET6: 840 { 841 struct sockaddr_in6 *sin6; 842 char l3s[INET6_ADDRSTRLEN]; 843 844 sin6 = (struct sockaddr_in6 *)&la->l3_addr; 845 IN6_PRINT(l3s, &sin6->sin6_addr); 846 db_printf(" l3_addr=%s\n", l3s); 847 break; 848 } 849 #endif 850 default: 851 db_printf(" l3_addr=N/A (af=%d)\n", la->l3_addr.sa_family); 852 break; 853 } 854 } 855 856 DB_SHOW_COMMAND(llentry, db_show_llentry) 857 { 858 859 if (!have_addr) { 860 db_printf("usage: show llentry <struct llentry *>\n"); 861 return; 862 } 863 864 llatbl_lle_show((struct llentry_sa *)addr); 865 } 866 867 static void 868 llatbl_llt_show(struct lltable *llt) 869 { 870 int i; 871 struct llentry *lle; 872 873 db_printf("llt=%p llt_af=%d llt_ifp=%p\n", 874 llt, llt->llt_af, llt->llt_ifp); 875 876 for (i = 0; i < llt->llt_hsize; i++) { 877 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 878 879 llatbl_lle_show((struct llentry_sa *)lle); 880 if (db_pager_quit) 881 return; 882 } 883 } 884 } 885 886 DB_SHOW_COMMAND(lltable, db_show_lltable) 887 { 888 889 if (!have_addr) { 890 db_printf("usage: show lltable <struct lltable *>\n"); 891 return; 892 } 893 894 llatbl_llt_show((struct lltable *)addr); 895 } 896 897 DB_SHOW_ALL_COMMAND(lltables, db_show_all_lltables) 898 { 899 VNET_ITERATOR_DECL(vnet_iter); 900 struct lltable *llt; 901 902 VNET_FOREACH(vnet_iter) { 903 CURVNET_SET_QUIET(vnet_iter); 904 #ifdef VIMAGE 905 db_printf("vnet=%p\n", curvnet); 906 #endif 907 SLIST_FOREACH(llt, &lltables, llt_link) { 908 db_printf("llt=%p llt_af=%d llt_ifp=%p(%s)\n", 909 llt, llt->llt_af, llt->llt_ifp, 910 (llt->llt_ifp != NULL) ? 911 llt->llt_ifp->if_xname : "?"); 912 if (have_addr && addr != 0) /* verbose */ 913 llatbl_llt_show(llt); 914 if (db_pager_quit) { 915 CURVNET_RESTORE(); 916 return; 917 } 918 } 919 CURVNET_RESTORE(); 920 } 921 } 922 #endif /* DDB */ 923 #endif /* __FreeBSD__ */ 924
Indexes created Wed Sep 24 05:09:52 GMT 2025