1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2004 Luigi Rizzo, Alessandro Cerri. All rights reserved. 5 * Copyright (c) 2004-2008 Qing Li. All rights reserved. 6 * Copyright (c) 2008 Kip Macy. All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include "opt_ddb.h" 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/syslog.h> 41 #include <sys/sysctl.h> 42 #include <sys/socket.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/rwlock.h> 47 48 #ifdef DDB 49 #include <ddb/ddb.h> 50 #endif 51 52 #include <vm/uma.h> 53 54 #include <netinet/in.h> 55 #include <net/if_llatbl.h> 56 #include <net/if.h> 57 #include <net/if_dl.h> 58 #include <net/if_var.h> 59 #include <net/route.h> 60 #include <net/vnet.h> 61 #include <netinet/if_ether.h> 62 #include <netinet6/in6_var.h> 63 #include <netinet6/nd6.h> 64 65 MALLOC_DEFINE(M_LLTABLE, "lltable", "link level address tables"); 66 67 static VNET_DEFINE(SLIST_HEAD(, lltable), lltables) = 68 SLIST_HEAD_INITIALIZER(lltables); 69 #define V_lltables VNET(lltables) 70 71 static struct rwlock lltable_list_lock; 72 RW_SYSINIT(lltable_list_lock, &lltable_list_lock, "lltable_list_lock"); 73 #define LLTABLE_LIST_RLOCK() rw_rlock(&lltable_list_lock) 74 #define LLTABLE_LIST_RUNLOCK() rw_runlock(&lltable_list_lock) 75 #define LLTABLE_LIST_WLOCK() rw_wlock(&lltable_list_lock) 76 #define LLTABLE_LIST_WUNLOCK() rw_wunlock(&lltable_list_lock) 77 #define LLTABLE_LIST_LOCK_ASSERT() rw_assert(&lltable_list_lock, RA_LOCKED) 78 79 static void lltable_unlink(struct lltable *llt); 80 static void llentries_unlink(struct lltable *llt, struct llentries *head); 81 82 static void htable_unlink_entry(struct llentry *lle); 83 static void htable_link_entry(struct lltable *llt, struct llentry *lle); 84 static int htable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f, 85 void *farg); 86 87 /* 88 * Dump lle state for a specific address family. 89 */ 90 static int 91 lltable_dump_af(struct lltable *llt, struct sysctl_req *wr) 92 { 93 int error; 94 95 LLTABLE_LIST_LOCK_ASSERT(); 96 97 if (llt->llt_ifp->if_flags & IFF_LOOPBACK) 98 return (0); 99 error = 0; 100 101 IF_AFDATA_RLOCK(llt->llt_ifp); 102 error = lltable_foreach_lle(llt, 103 (llt_foreach_cb_t *)llt->llt_dump_entry, wr); 104 IF_AFDATA_RUNLOCK(llt->llt_ifp); 105 106 return (error); 107 } 108 109 /* 110 * Dump arp state for a specific address family. 111 */ 112 int 113 lltable_sysctl_dumparp(int af, struct sysctl_req *wr) 114 { 115 struct lltable *llt; 116 int error = 0; 117 118 LLTABLE_LIST_RLOCK(); 119 SLIST_FOREACH(llt, &V_lltables, llt_link) { 120 if (llt->llt_af == af) { 121 error = lltable_dump_af(llt, wr); 122 if (error != 0) 123 goto done; 124 } 125 } 126 done: 127 LLTABLE_LIST_RUNLOCK(); 128 return (error); 129 } 130 131 /* 132 * Common function helpers for chained hash table. 133 */ 134 135 /* 136 * Runs specified callback for each entry in @llt. 137 * Caller does the locking. 138 * 139 */ 140 static int 141 htable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f, void *farg) 142 { 143 struct llentry *lle, *next; 144 int i, error; 145 146 error = 0; 147 148 for (i = 0; i < llt->llt_hsize; i++) { 149 CK_LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) { 150 error = f(llt, lle, farg); 151 if (error != 0) 152 break; 153 } 154 } 155 156 return (error); 157 } 158 159 static void 160 htable_link_entry(struct lltable *llt, struct llentry *lle) 161 { 162 struct llentries *lleh; 163 uint32_t hashidx; 164 165 if ((lle->la_flags & LLE_LINKED) != 0) 166 return; 167 168 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp); 169 170 hashidx = llt->llt_hash(lle, llt->llt_hsize); 171 lleh = &llt->lle_head[hashidx]; 172 173 lle->lle_tbl = llt; 174 lle->lle_head = lleh; 175 lle->la_flags |= LLE_LINKED; 176 CK_LIST_INSERT_HEAD(lleh, lle, lle_next); 177 } 178 179 static void 180 htable_unlink_entry(struct llentry *lle) 181 { 182 183 if ((lle->la_flags & LLE_LINKED) != 0) { 184 IF_AFDATA_WLOCK_ASSERT(lle->lle_tbl->llt_ifp); 185 CK_LIST_REMOVE(lle, lle_next); 186 lle->la_flags &= ~(LLE_VALID | LLE_LINKED); 187 #if 0 188 lle->lle_tbl = NULL; 189 lle->lle_head = NULL; 190 #endif 191 } 192 } 193 194 struct prefix_match_data { 195 const struct sockaddr *addr; 196 const struct sockaddr *mask; 197 struct llentries dchain; 198 u_int flags; 199 }; 200 201 static int 202 htable_prefix_free_cb(struct lltable *llt, struct llentry *lle, void *farg) 203 { 204 struct prefix_match_data *pmd; 205 206 pmd = (struct prefix_match_data *)farg; 207 208 if (llt->llt_match_prefix(pmd->addr, pmd->mask, pmd->flags, lle)) { 209 LLE_WLOCK(lle); 210 CK_LIST_INSERT_HEAD(&pmd->dchain, lle, lle_chain); 211 } 212 213 return (0); 214 } 215 216 static void 217 htable_prefix_free(struct lltable *llt, const struct sockaddr *addr, 218 const struct sockaddr *mask, u_int flags) 219 { 220 struct llentry *lle, *next; 221 struct prefix_match_data pmd; 222 223 bzero(&pmd, sizeof(pmd)); 224 pmd.addr = addr; 225 pmd.mask = mask; 226 pmd.flags = flags; 227 CK_LIST_INIT(&pmd.dchain); 228 229 IF_AFDATA_WLOCK(llt->llt_ifp); 230 /* Push matching lles to chain */ 231 lltable_foreach_lle(llt, htable_prefix_free_cb, &pmd); 232 233 llentries_unlink(llt, &pmd.dchain); 234 IF_AFDATA_WUNLOCK(llt->llt_ifp); 235 236 CK_LIST_FOREACH_SAFE(lle, &pmd.dchain, lle_chain, next) 237 lltable_free_entry(llt, lle); 238 } 239 240 static void 241 htable_free_tbl(struct lltable *llt) 242 { 243 244 free(llt->lle_head, M_LLTABLE); 245 free(llt, M_LLTABLE); 246 } 247 248 static void 249 llentries_unlink(struct lltable *llt, struct llentries *head) 250 { 251 struct llentry *lle, *next; 252 253 CK_LIST_FOREACH_SAFE(lle, head, lle_chain, next) 254 llt->llt_unlink_entry(lle); 255 } 256 257 /* 258 * Helper function used to drop all mbufs in hold queue. 259 * 260 * Returns the number of held packets, if any, that were dropped. 261 */ 262 size_t 263 lltable_drop_entry_queue(struct llentry *lle) 264 { 265 size_t pkts_dropped; 266 struct mbuf *next; 267 268 LLE_WLOCK_ASSERT(lle); 269 270 pkts_dropped = 0; 271 while ((lle->la_numheld > 0) && (lle->la_hold != NULL)) { 272 next = lle->la_hold->m_nextpkt; 273 m_freem(lle->la_hold); 274 lle->la_hold = next; 275 lle->la_numheld--; 276 pkts_dropped++; 277 } 278 279 KASSERT(lle->la_numheld == 0, 280 ("%s: la_numheld %d > 0, pkts_droped %zd", __func__, 281 lle->la_numheld, pkts_dropped)); 282 283 return (pkts_dropped); 284 } 285 286 void 287 lltable_set_entry_addr(struct ifnet *ifp, struct llentry *lle, 288 const char *linkhdr, size_t linkhdrsize, int lladdr_off) 289 { 290 291 memcpy(lle->r_linkdata, linkhdr, linkhdrsize); 292 lle->r_hdrlen = linkhdrsize; 293 lle->ll_addr = &lle->r_linkdata[lladdr_off]; 294 lle->la_flags |= LLE_VALID; 295 lle->r_flags |= RLLE_VALID; 296 } 297 298 /* 299 * Tries to update @lle link-level address. 300 * Since update requires AFDATA WLOCK, function 301 * drops @lle lock, acquires AFDATA lock and then acquires 302 * @lle lock to maintain lock order. 303 * 304 * Returns 1 on success. 305 */ 306 int 307 lltable_try_set_entry_addr(struct ifnet *ifp, struct llentry *lle, 308 const char *linkhdr, size_t linkhdrsize, int lladdr_off) 309 { 310 311 /* Perform real LLE update */ 312 /* use afdata WLOCK to update fields */ 313 LLE_WLOCK_ASSERT(lle); 314 LLE_ADDREF(lle); 315 LLE_WUNLOCK(lle); 316 IF_AFDATA_WLOCK(ifp); 317 LLE_WLOCK(lle); 318 319 /* 320 * Since we droppped LLE lock, other thread might have deleted 321 * this lle. Check and return 322 */ 323 if ((lle->la_flags & LLE_DELETED) != 0) { 324 IF_AFDATA_WUNLOCK(ifp); 325 LLE_FREE_LOCKED(lle); 326 return (0); 327 } 328 329 /* Update data */ 330 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, lladdr_off); 331 332 IF_AFDATA_WUNLOCK(ifp); 333 334 LLE_REMREF(lle); 335 336 return (1); 337 } 338 339 /* 340 * Helper function used to pre-compute full/partial link-layer 341 * header data suitable for feeding into if_output(). 342 */ 343 int 344 lltable_calc_llheader(struct ifnet *ifp, int family, char *lladdr, 345 char *buf, size_t *bufsize, int *lladdr_off) 346 { 347 struct if_encap_req ereq; 348 int error; 349 350 bzero(buf, *bufsize); 351 bzero(&ereq, sizeof(ereq)); 352 ereq.buf = buf; 353 ereq.bufsize = *bufsize; 354 ereq.rtype = IFENCAP_LL; 355 ereq.family = family; 356 ereq.lladdr = lladdr; 357 ereq.lladdr_len = ifp->if_addrlen; 358 error = ifp->if_requestencap(ifp, &ereq); 359 if (error == 0) { 360 *bufsize = ereq.bufsize; 361 *lladdr_off = ereq.lladdr_off; 362 } 363 364 return (error); 365 } 366 367 /* 368 * Update link-layer header for given @lle after 369 * interface lladdr was changed. 370 */ 371 static int 372 llentry_update_ifaddr(struct lltable *llt, struct llentry *lle, void *farg) 373 { 374 struct ifnet *ifp; 375 u_char linkhdr[LLE_MAX_LINKHDR]; 376 size_t linkhdrsize; 377 u_char *lladdr; 378 int lladdr_off; 379 380 ifp = (struct ifnet *)farg; 381 382 lladdr = lle->ll_addr; 383 384 LLE_WLOCK(lle); 385 if ((lle->la_flags & LLE_VALID) == 0) { 386 LLE_WUNLOCK(lle); 387 return (0); 388 } 389 390 if ((lle->la_flags & LLE_IFADDR) != 0) 391 lladdr = IF_LLADDR(ifp); 392 393 linkhdrsize = sizeof(linkhdr); 394 lltable_calc_llheader(ifp, llt->llt_af, lladdr, linkhdr, &linkhdrsize, 395 &lladdr_off); 396 memcpy(lle->r_linkdata, linkhdr, linkhdrsize); 397 LLE_WUNLOCK(lle); 398 399 return (0); 400 } 401 402 /* 403 * Update all calculated headers for given @llt 404 */ 405 void 406 lltable_update_ifaddr(struct lltable *llt) 407 { 408 409 if (llt->llt_ifp->if_flags & IFF_LOOPBACK) 410 return; 411 412 IF_AFDATA_WLOCK(llt->llt_ifp); 413 lltable_foreach_lle(llt, llentry_update_ifaddr, llt->llt_ifp); 414 IF_AFDATA_WUNLOCK(llt->llt_ifp); 415 } 416 417 /* 418 * 419 * Performs generic cleanup routines and frees lle. 420 * 421 * Called for non-linked entries, with callouts and 422 * other AF-specific cleanups performed. 423 * 424 * @lle must be passed WLOCK'ed 425 * 426 * Returns the number of held packets, if any, that were dropped. 427 */ 428 size_t 429 llentry_free(struct llentry *lle) 430 { 431 size_t pkts_dropped; 432 433 LLE_WLOCK_ASSERT(lle); 434 435 KASSERT((lle->la_flags & LLE_LINKED) == 0, ("freeing linked lle")); 436 437 pkts_dropped = lltable_drop_entry_queue(lle); 438 439 LLE_FREE_LOCKED(lle); 440 441 return (pkts_dropped); 442 } 443 444 /* 445 * (al)locate an llentry for address dst (equivalent to rtalloc for new-arp). 446 * 447 * If found the llentry * is returned referenced and unlocked. 448 */ 449 struct llentry * 450 llentry_alloc(struct ifnet *ifp, struct lltable *lt, 451 struct sockaddr_storage *dst) 452 { 453 struct llentry *la, *la_tmp; 454 455 IF_AFDATA_RLOCK(ifp); 456 la = lla_lookup(lt, LLE_EXCLUSIVE, (struct sockaddr *)dst); 457 IF_AFDATA_RUNLOCK(ifp); 458 459 if (la != NULL) { 460 LLE_ADDREF(la); 461 LLE_WUNLOCK(la); 462 return (la); 463 } 464 465 if ((ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0) { 466 la = lltable_alloc_entry(lt, 0, (struct sockaddr *)dst); 467 if (la == NULL) 468 return (NULL); 469 IF_AFDATA_WLOCK(ifp); 470 LLE_WLOCK(la); 471 /* Prefer any existing LLE over newly-created one */ 472 la_tmp = lla_lookup(lt, LLE_EXCLUSIVE, (struct sockaddr *)dst); 473 if (la_tmp == NULL) 474 lltable_link_entry(lt, la); 475 IF_AFDATA_WUNLOCK(ifp); 476 if (la_tmp != NULL) { 477 lltable_free_entry(lt, la); 478 la = la_tmp; 479 } 480 LLE_ADDREF(la); 481 LLE_WUNLOCK(la); 482 } 483 484 return (la); 485 } 486 487 /* 488 * Free all entries from given table and free itself. 489 */ 490 491 static int 492 lltable_free_cb(struct lltable *llt, struct llentry *lle, void *farg) 493 { 494 struct llentries *dchain; 495 496 dchain = (struct llentries *)farg; 497 498 LLE_WLOCK(lle); 499 CK_LIST_INSERT_HEAD(dchain, lle, lle_chain); 500 501 return (0); 502 } 503 504 /* 505 * Free all entries from given table and free itself. 506 */ 507 void 508 lltable_free(struct lltable *llt) 509 { 510 struct llentry *lle, *next; 511 struct llentries dchain; 512 513 KASSERT(llt != NULL, ("%s: llt is NULL", __func__)); 514 515 lltable_unlink(llt); 516 517 CK_LIST_INIT(&dchain); 518 IF_AFDATA_WLOCK(llt->llt_ifp); 519 /* Push all lles to @dchain */ 520 lltable_foreach_lle(llt, lltable_free_cb, &dchain); 521 llentries_unlink(llt, &dchain); 522 IF_AFDATA_WUNLOCK(llt->llt_ifp); 523 524 CK_LIST_FOREACH_SAFE(lle, &dchain, lle_chain, next) { 525 if (callout_stop(&lle->lle_timer) > 0) 526 LLE_REMREF(lle); 527 llentry_free(lle); 528 } 529 530 llt->llt_free_tbl(llt); 531 } 532 533 #if 0 534 void 535 lltable_drain(int af) 536 { 537 struct lltable *llt; 538 struct llentry *lle; 539 int i; 540 541 LLTABLE_LIST_RLOCK(); 542 SLIST_FOREACH(llt, &V_lltables, llt_link) { 543 if (llt->llt_af != af) 544 continue; 545 546 for (i=0; i < llt->llt_hsize; i++) { 547 CK_LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 548 LLE_WLOCK(lle); 549 if (lle->la_hold) { 550 m_freem(lle->la_hold); 551 lle->la_hold = NULL; 552 } 553 LLE_WUNLOCK(lle); 554 } 555 } 556 } 557 LLTABLE_LIST_RUNLOCK(); 558 } 559 #endif 560 561 /* 562 * Deletes an address from given lltable. 563 * Used for userland interaction to remove 564 * individual entries. Skips entries added by OS. 565 */ 566 int 567 lltable_delete_addr(struct lltable *llt, u_int flags, 568 const struct sockaddr *l3addr) 569 { 570 struct llentry *lle; 571 struct ifnet *ifp; 572 573 ifp = llt->llt_ifp; 574 IF_AFDATA_WLOCK(ifp); 575 lle = lla_lookup(llt, LLE_EXCLUSIVE, l3addr); 576 577 if (lle == NULL) { 578 IF_AFDATA_WUNLOCK(ifp); 579 return (ENOENT); 580 } 581 if ((lle->la_flags & LLE_IFADDR) != 0 && (flags & LLE_IFADDR) == 0) { 582 IF_AFDATA_WUNLOCK(ifp); 583 LLE_WUNLOCK(lle); 584 return (EPERM); 585 } 586 587 lltable_unlink_entry(llt, lle); 588 IF_AFDATA_WUNLOCK(ifp); 589 590 llt->llt_delete_entry(llt, lle); 591 592 return (0); 593 } 594 595 void 596 lltable_prefix_free(int af, struct sockaddr *addr, struct sockaddr *mask, 597 u_int flags) 598 { 599 struct lltable *llt; 600 601 LLTABLE_LIST_RLOCK(); 602 SLIST_FOREACH(llt, &V_lltables, llt_link) { 603 if (llt->llt_af != af) 604 continue; 605 606 llt->llt_prefix_free(llt, addr, mask, flags); 607 } 608 LLTABLE_LIST_RUNLOCK(); 609 } 610 611 struct lltable * 612 lltable_allocate_htbl(uint32_t hsize) 613 { 614 struct lltable *llt; 615 int i; 616 617 llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK | M_ZERO); 618 llt->llt_hsize = hsize; 619 llt->lle_head = malloc(sizeof(struct llentries) * hsize, 620 M_LLTABLE, M_WAITOK | M_ZERO); 621 622 for (i = 0; i < llt->llt_hsize; i++) 623 CK_LIST_INIT(&llt->lle_head[i]); 624 625 /* Set some default callbacks */ 626 llt->llt_link_entry = htable_link_entry; 627 llt->llt_unlink_entry = htable_unlink_entry; 628 llt->llt_prefix_free = htable_prefix_free; 629 llt->llt_foreach_entry = htable_foreach_lle; 630 llt->llt_free_tbl = htable_free_tbl; 631 632 return (llt); 633 } 634 635 /* 636 * Links lltable to global llt list. 637 */ 638 void 639 lltable_link(struct lltable *llt) 640 { 641 642 LLTABLE_LIST_WLOCK(); 643 SLIST_INSERT_HEAD(&V_lltables, llt, llt_link); 644 LLTABLE_LIST_WUNLOCK(); 645 } 646 647 static void 648 lltable_unlink(struct lltable *llt) 649 { 650 651 LLTABLE_LIST_WLOCK(); 652 SLIST_REMOVE(&V_lltables, llt, lltable, llt_link); 653 LLTABLE_LIST_WUNLOCK(); 654 655 } 656 657 /* 658 * External methods used by lltable consumers 659 */ 660 661 int 662 lltable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f, void *farg) 663 { 664 665 return (llt->llt_foreach_entry(llt, f, farg)); 666 } 667 668 struct llentry * 669 lltable_alloc_entry(struct lltable *llt, u_int flags, 670 const struct sockaddr *l3addr) 671 { 672 673 return (llt->llt_alloc_entry(llt, flags, l3addr)); 674 } 675 676 void 677 lltable_free_entry(struct lltable *llt, struct llentry *lle) 678 { 679 680 llt->llt_free_entry(llt, lle); 681 } 682 683 void 684 lltable_link_entry(struct lltable *llt, struct llentry *lle) 685 { 686 687 llt->llt_link_entry(llt, lle); 688 } 689 690 void 691 lltable_unlink_entry(struct lltable *llt, struct llentry *lle) 692 { 693 694 llt->llt_unlink_entry(lle); 695 } 696 697 void 698 lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 699 { 700 struct lltable *llt; 701 702 llt = lle->lle_tbl; 703 llt->llt_fill_sa_entry(lle, sa); 704 } 705 706 struct ifnet * 707 lltable_get_ifp(const struct lltable *llt) 708 { 709 710 return (llt->llt_ifp); 711 } 712 713 int 714 lltable_get_af(const struct lltable *llt) 715 { 716 717 return (llt->llt_af); 718 } 719 720 /* 721 * Called in route_output when rtm_flags contains RTF_LLDATA. 722 */ 723 int 724 lla_rt_output(struct rt_msghdr *rtm, struct rt_addrinfo *info) 725 { 726 struct sockaddr_dl *dl = 727 (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY]; 728 struct sockaddr *dst = (struct sockaddr *)info->rti_info[RTAX_DST]; 729 struct ifnet *ifp; 730 struct lltable *llt; 731 struct llentry *lle, *lle_tmp; 732 uint8_t linkhdr[LLE_MAX_LINKHDR]; 733 size_t linkhdrsize; 734 int lladdr_off; 735 u_int laflags = 0; 736 int error; 737 738 KASSERT(dl != NULL && dl->sdl_family == AF_LINK, 739 ("%s: invalid dl\n", __func__)); 740 741 ifp = ifnet_byindex(dl->sdl_index); 742 if (ifp == NULL) { 743 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n", 744 __func__, dl->sdl_index); 745 return EINVAL; 746 } 747 748 /* XXX linked list may be too expensive */ 749 LLTABLE_LIST_RLOCK(); 750 SLIST_FOREACH(llt, &V_lltables, llt_link) { 751 if (llt->llt_af == dst->sa_family && 752 llt->llt_ifp == ifp) 753 break; 754 } 755 LLTABLE_LIST_RUNLOCK(); 756 KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n")); 757 758 error = 0; 759 760 switch (rtm->rtm_type) { 761 case RTM_ADD: 762 /* Add static LLE */ 763 laflags = 0; 764 if (rtm->rtm_rmx.rmx_expire == 0) 765 laflags = LLE_STATIC; 766 lle = lltable_alloc_entry(llt, laflags, dst); 767 if (lle == NULL) 768 return (ENOMEM); 769 770 linkhdrsize = sizeof(linkhdr); 771 if (lltable_calc_llheader(ifp, dst->sa_family, LLADDR(dl), 772 linkhdr, &linkhdrsize, &lladdr_off) != 0) 773 return (EINVAL); 774 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 775 lladdr_off); 776 if ((rtm->rtm_flags & RTF_ANNOUNCE)) 777 lle->la_flags |= LLE_PUB; 778 lle->la_expire = rtm->rtm_rmx.rmx_expire; 779 780 laflags = lle->la_flags; 781 782 /* Try to link new entry */ 783 lle_tmp = NULL; 784 IF_AFDATA_WLOCK(ifp); 785 LLE_WLOCK(lle); 786 lle_tmp = lla_lookup(llt, LLE_EXCLUSIVE, dst); 787 if (lle_tmp != NULL) { 788 /* Check if we are trying to replace immutable entry */ 789 if ((lle_tmp->la_flags & LLE_IFADDR) != 0) { 790 IF_AFDATA_WUNLOCK(ifp); 791 LLE_WUNLOCK(lle_tmp); 792 lltable_free_entry(llt, lle); 793 return (EPERM); 794 } 795 /* Unlink existing entry from table */ 796 lltable_unlink_entry(llt, lle_tmp); 797 } 798 lltable_link_entry(llt, lle); 799 IF_AFDATA_WUNLOCK(ifp); 800 801 if (lle_tmp != NULL) { 802 EVENTHANDLER_INVOKE(lle_event, lle_tmp,LLENTRY_EXPIRED); 803 lltable_free_entry(llt, lle_tmp); 804 } 805 806 /* 807 * By invoking LLE handler here we might get 808 * two events on static LLE entry insertion 809 * in routing socket. However, since we might have 810 * other subscribers we need to generate this event. 811 */ 812 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_RESOLVED); 813 LLE_WUNLOCK(lle); 814 #ifdef INET 815 /* gratuitous ARP */ 816 if ((laflags & LLE_PUB) && dst->sa_family == AF_INET) 817 arprequest(ifp, 818 &((struct sockaddr_in *)dst)->sin_addr, 819 &((struct sockaddr_in *)dst)->sin_addr, 820 (u_char *)LLADDR(dl)); 821 #endif 822 823 break; 824 825 case RTM_DELETE: 826 return (lltable_delete_addr(llt, 0, dst)); 827 828 default: 829 error = EINVAL; 830 } 831 832 return (error); 833 } 834 835 #ifdef DDB 836 struct llentry_sa { 837 struct llentry base; 838 struct sockaddr l3_addr; 839 }; 840 841 static void 842 llatbl_lle_show(struct llentry_sa *la) 843 { 844 struct llentry *lle; 845 uint8_t octet[6]; 846 847 lle = &la->base; 848 db_printf("lle=%p\n", lle); 849 db_printf(" lle_next=%p\n", lle->lle_next.cle_next); 850 db_printf(" lle_lock=%p\n", &lle->lle_lock); 851 db_printf(" lle_tbl=%p\n", lle->lle_tbl); 852 db_printf(" lle_head=%p\n", lle->lle_head); 853 db_printf(" la_hold=%p\n", lle->la_hold); 854 db_printf(" la_numheld=%d\n", lle->la_numheld); 855 db_printf(" la_expire=%ju\n", (uintmax_t)lle->la_expire); 856 db_printf(" la_flags=0x%04x\n", lle->la_flags); 857 db_printf(" la_asked=%u\n", lle->la_asked); 858 db_printf(" la_preempt=%u\n", lle->la_preempt); 859 db_printf(" ln_state=%d\n", lle->ln_state); 860 db_printf(" ln_router=%u\n", lle->ln_router); 861 db_printf(" ln_ntick=%ju\n", (uintmax_t)lle->ln_ntick); 862 db_printf(" lle_refcnt=%d\n", lle->lle_refcnt); 863 bcopy(lle->ll_addr, octet, sizeof(octet)); 864 db_printf(" ll_addr=%02x:%02x:%02x:%02x:%02x:%02x\n", 865 octet[0], octet[1], octet[2], octet[3], octet[4], octet[5]); 866 db_printf(" lle_timer=%p\n", &lle->lle_timer); 867 868 switch (la->l3_addr.sa_family) { 869 #ifdef INET 870 case AF_INET: 871 { 872 struct sockaddr_in *sin; 873 char l3s[INET_ADDRSTRLEN]; 874 875 sin = (struct sockaddr_in *)&la->l3_addr; 876 inet_ntoa_r(sin->sin_addr, l3s); 877 db_printf(" l3_addr=%s\n", l3s); 878 break; 879 } 880 #endif 881 #ifdef INET6 882 case AF_INET6: 883 { 884 struct sockaddr_in6 *sin6; 885 char l3s[INET6_ADDRSTRLEN]; 886 887 sin6 = (struct sockaddr_in6 *)&la->l3_addr; 888 ip6_sprintf(l3s, &sin6->sin6_addr); 889 db_printf(" l3_addr=%s\n", l3s); 890 break; 891 } 892 #endif 893 default: 894 db_printf(" l3_addr=N/A (af=%d)\n", la->l3_addr.sa_family); 895 break; 896 } 897 } 898 899 DB_SHOW_COMMAND(llentry, db_show_llentry) 900 { 901 902 if (!have_addr) { 903 db_printf("usage: show llentry <struct llentry *>\n"); 904 return; 905 } 906 907 llatbl_lle_show((struct llentry_sa *)addr); 908 } 909 910 static void 911 llatbl_llt_show(struct lltable *llt) 912 { 913 int i; 914 struct llentry *lle; 915 916 db_printf("llt=%p llt_af=%d llt_ifp=%p\n", 917 llt, llt->llt_af, llt->llt_ifp); 918 919 for (i = 0; i < llt->llt_hsize; i++) { 920 CK_LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 921 922 llatbl_lle_show((struct llentry_sa *)lle); 923 if (db_pager_quit) 924 return; 925 } 926 } 927 } 928 929 DB_SHOW_COMMAND(lltable, db_show_lltable) 930 { 931 932 if (!have_addr) { 933 db_printf("usage: show lltable <struct lltable *>\n"); 934 return; 935 } 936 937 llatbl_llt_show((struct lltable *)addr); 938 } 939 940 DB_SHOW_ALL_COMMAND(lltables, db_show_all_lltables) 941 { 942 VNET_ITERATOR_DECL(vnet_iter); 943 struct lltable *llt; 944 945 VNET_FOREACH(vnet_iter) { 946 CURVNET_SET_QUIET(vnet_iter); 947 #ifdef VIMAGE 948 db_printf("vnet=%p\n", curvnet); 949 #endif 950 SLIST_FOREACH(llt, &V_lltables, llt_link) { 951 db_printf("llt=%p llt_af=%d llt_ifp=%p(%s)\n", 952 llt, llt->llt_af, llt->llt_ifp, 953 (llt->llt_ifp != NULL) ? 954 llt->llt_ifp->if_xname : "?"); 955 if (have_addr && addr != 0) /* verbose */ 956 llatbl_llt_show(llt); 957 if (db_pager_quit) { 958 CURVNET_RESTORE(); 959 return; 960 } 961 } 962 CURVNET_RESTORE(); 963 } 964 } 965 #endif 966