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 VNET_DEFINE_STATIC(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 /* cancel timer */ 440 if (callout_stop(&lle->lle_timer) > 0) 441 LLE_REMREF(lle); 442 LLE_FREE_LOCKED(lle); 443 444 return (pkts_dropped); 445 } 446 447 /* 448 * (al)locate an llentry for address dst (equivalent to rtalloc for new-arp). 449 * 450 * If found the llentry * is returned referenced and unlocked. 451 */ 452 struct llentry * 453 llentry_alloc(struct ifnet *ifp, struct lltable *lt, 454 struct sockaddr_storage *dst) 455 { 456 struct llentry *la, *la_tmp; 457 458 IF_AFDATA_RLOCK(ifp); 459 la = lla_lookup(lt, LLE_EXCLUSIVE, (struct sockaddr *)dst); 460 IF_AFDATA_RUNLOCK(ifp); 461 462 if (la != NULL) { 463 LLE_ADDREF(la); 464 LLE_WUNLOCK(la); 465 return (la); 466 } 467 468 if ((ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0) { 469 la = lltable_alloc_entry(lt, 0, (struct sockaddr *)dst); 470 if (la == NULL) 471 return (NULL); 472 IF_AFDATA_WLOCK(ifp); 473 LLE_WLOCK(la); 474 /* Prefer any existing LLE over newly-created one */ 475 la_tmp = lla_lookup(lt, LLE_EXCLUSIVE, (struct sockaddr *)dst); 476 if (la_tmp == NULL) 477 lltable_link_entry(lt, la); 478 IF_AFDATA_WUNLOCK(ifp); 479 if (la_tmp != NULL) { 480 lltable_free_entry(lt, la); 481 la = la_tmp; 482 } 483 LLE_ADDREF(la); 484 LLE_WUNLOCK(la); 485 } 486 487 return (la); 488 } 489 490 /* 491 * Free all entries from given table and free itself. 492 */ 493 494 static int 495 lltable_free_cb(struct lltable *llt, struct llentry *lle, void *farg) 496 { 497 struct llentries *dchain; 498 499 dchain = (struct llentries *)farg; 500 501 LLE_WLOCK(lle); 502 CK_LIST_INSERT_HEAD(dchain, lle, lle_chain); 503 504 return (0); 505 } 506 507 /* 508 * Free all entries from given table and free itself. 509 */ 510 void 511 lltable_free(struct lltable *llt) 512 { 513 struct llentry *lle, *next; 514 struct llentries dchain; 515 516 KASSERT(llt != NULL, ("%s: llt is NULL", __func__)); 517 518 lltable_unlink(llt); 519 520 CK_LIST_INIT(&dchain); 521 IF_AFDATA_WLOCK(llt->llt_ifp); 522 /* Push all lles to @dchain */ 523 lltable_foreach_lle(llt, lltable_free_cb, &dchain); 524 llentries_unlink(llt, &dchain); 525 IF_AFDATA_WUNLOCK(llt->llt_ifp); 526 527 CK_LIST_FOREACH_SAFE(lle, &dchain, lle_chain, next) { 528 llentry_free(lle); 529 } 530 531 llt->llt_free_tbl(llt); 532 } 533 534 #if 0 535 void 536 lltable_drain(int af) 537 { 538 struct lltable *llt; 539 struct llentry *lle; 540 int i; 541 542 LLTABLE_LIST_RLOCK(); 543 SLIST_FOREACH(llt, &V_lltables, llt_link) { 544 if (llt->llt_af != af) 545 continue; 546 547 for (i=0; i < llt->llt_hsize; i++) { 548 CK_LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 549 LLE_WLOCK(lle); 550 if (lle->la_hold) { 551 m_freem(lle->la_hold); 552 lle->la_hold = NULL; 553 } 554 LLE_WUNLOCK(lle); 555 } 556 } 557 } 558 LLTABLE_LIST_RUNLOCK(); 559 } 560 #endif 561 562 /* 563 * Deletes an address from given lltable. 564 * Used for userland interaction to remove 565 * individual entries. Skips entries added by OS. 566 */ 567 int 568 lltable_delete_addr(struct lltable *llt, u_int flags, 569 const struct sockaddr *l3addr) 570 { 571 struct llentry *lle; 572 struct ifnet *ifp; 573 574 ifp = llt->llt_ifp; 575 IF_AFDATA_WLOCK(ifp); 576 lle = lla_lookup(llt, LLE_EXCLUSIVE, l3addr); 577 578 if (lle == NULL) { 579 IF_AFDATA_WUNLOCK(ifp); 580 return (ENOENT); 581 } 582 if ((lle->la_flags & LLE_IFADDR) != 0 && (flags & LLE_IFADDR) == 0) { 583 IF_AFDATA_WUNLOCK(ifp); 584 LLE_WUNLOCK(lle); 585 return (EPERM); 586 } 587 588 lltable_unlink_entry(llt, lle); 589 IF_AFDATA_WUNLOCK(ifp); 590 591 llt->llt_delete_entry(llt, lle); 592 593 return (0); 594 } 595 596 void 597 lltable_prefix_free(int af, struct sockaddr *addr, struct sockaddr *mask, 598 u_int flags) 599 { 600 struct lltable *llt; 601 602 LLTABLE_LIST_RLOCK(); 603 SLIST_FOREACH(llt, &V_lltables, llt_link) { 604 if (llt->llt_af != af) 605 continue; 606 607 llt->llt_prefix_free(llt, addr, mask, flags); 608 } 609 LLTABLE_LIST_RUNLOCK(); 610 } 611 612 struct lltable * 613 lltable_allocate_htbl(uint32_t hsize) 614 { 615 struct lltable *llt; 616 int i; 617 618 llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK | M_ZERO); 619 llt->llt_hsize = hsize; 620 llt->lle_head = malloc(sizeof(struct llentries) * hsize, 621 M_LLTABLE, M_WAITOK | M_ZERO); 622 623 for (i = 0; i < llt->llt_hsize; i++) 624 CK_LIST_INIT(&llt->lle_head[i]); 625 626 /* Set some default callbacks */ 627 llt->llt_link_entry = htable_link_entry; 628 llt->llt_unlink_entry = htable_unlink_entry; 629 llt->llt_prefix_free = htable_prefix_free; 630 llt->llt_foreach_entry = htable_foreach_lle; 631 llt->llt_free_tbl = htable_free_tbl; 632 633 return (llt); 634 } 635 636 /* 637 * Links lltable to global llt list. 638 */ 639 void 640 lltable_link(struct lltable *llt) 641 { 642 643 LLTABLE_LIST_WLOCK(); 644 SLIST_INSERT_HEAD(&V_lltables, llt, llt_link); 645 LLTABLE_LIST_WUNLOCK(); 646 } 647 648 static void 649 lltable_unlink(struct lltable *llt) 650 { 651 652 LLTABLE_LIST_WLOCK(); 653 SLIST_REMOVE(&V_lltables, llt, lltable, llt_link); 654 LLTABLE_LIST_WUNLOCK(); 655 656 } 657 658 /* 659 * External methods used by lltable consumers 660 */ 661 662 int 663 lltable_foreach_lle(struct lltable *llt, llt_foreach_cb_t *f, void *farg) 664 { 665 666 return (llt->llt_foreach_entry(llt, f, farg)); 667 } 668 669 struct llentry * 670 lltable_alloc_entry(struct lltable *llt, u_int flags, 671 const struct sockaddr *l3addr) 672 { 673 674 return (llt->llt_alloc_entry(llt, flags, l3addr)); 675 } 676 677 void 678 lltable_free_entry(struct lltable *llt, struct llentry *lle) 679 { 680 681 llt->llt_free_entry(llt, lle); 682 } 683 684 void 685 lltable_link_entry(struct lltable *llt, struct llentry *lle) 686 { 687 688 llt->llt_link_entry(llt, lle); 689 } 690 691 void 692 lltable_unlink_entry(struct lltable *llt, struct llentry *lle) 693 { 694 695 llt->llt_unlink_entry(lle); 696 } 697 698 void 699 lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa) 700 { 701 struct lltable *llt; 702 703 llt = lle->lle_tbl; 704 llt->llt_fill_sa_entry(lle, sa); 705 } 706 707 struct ifnet * 708 lltable_get_ifp(const struct lltable *llt) 709 { 710 711 return (llt->llt_ifp); 712 } 713 714 int 715 lltable_get_af(const struct lltable *llt) 716 { 717 718 return (llt->llt_af); 719 } 720 721 /* 722 * Called in route_output when rtm_flags contains RTF_LLDATA. 723 */ 724 int 725 lla_rt_output(struct rt_msghdr *rtm, struct rt_addrinfo *info) 726 { 727 struct sockaddr_dl *dl = 728 (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY]; 729 struct sockaddr *dst = (struct sockaddr *)info->rti_info[RTAX_DST]; 730 struct ifnet *ifp; 731 struct lltable *llt; 732 struct llentry *lle, *lle_tmp; 733 uint8_t linkhdr[LLE_MAX_LINKHDR]; 734 size_t linkhdrsize; 735 int lladdr_off; 736 u_int laflags = 0; 737 int error; 738 739 KASSERT(dl != NULL && dl->sdl_family == AF_LINK, 740 ("%s: invalid dl\n", __func__)); 741 742 ifp = ifnet_byindex(dl->sdl_index); 743 if (ifp == NULL) { 744 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n", 745 __func__, dl->sdl_index); 746 return EINVAL; 747 } 748 749 /* XXX linked list may be too expensive */ 750 LLTABLE_LIST_RLOCK(); 751 SLIST_FOREACH(llt, &V_lltables, llt_link) { 752 if (llt->llt_af == dst->sa_family && 753 llt->llt_ifp == ifp) 754 break; 755 } 756 LLTABLE_LIST_RUNLOCK(); 757 KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n")); 758 759 error = 0; 760 761 switch (rtm->rtm_type) { 762 case RTM_ADD: 763 /* Add static LLE */ 764 laflags = 0; 765 if (rtm->rtm_rmx.rmx_expire == 0) 766 laflags = LLE_STATIC; 767 lle = lltable_alloc_entry(llt, laflags, dst); 768 if (lle == NULL) 769 return (ENOMEM); 770 771 linkhdrsize = sizeof(linkhdr); 772 if (lltable_calc_llheader(ifp, dst->sa_family, LLADDR(dl), 773 linkhdr, &linkhdrsize, &lladdr_off) != 0) 774 return (EINVAL); 775 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize, 776 lladdr_off); 777 if ((rtm->rtm_flags & RTF_ANNOUNCE)) 778 lle->la_flags |= LLE_PUB; 779 lle->la_expire = rtm->rtm_rmx.rmx_expire; 780 781 laflags = lle->la_flags; 782 783 /* Try to link new entry */ 784 lle_tmp = NULL; 785 IF_AFDATA_WLOCK(ifp); 786 LLE_WLOCK(lle); 787 lle_tmp = lla_lookup(llt, LLE_EXCLUSIVE, dst); 788 if (lle_tmp != NULL) { 789 /* Check if we are trying to replace immutable entry */ 790 if ((lle_tmp->la_flags & LLE_IFADDR) != 0) { 791 IF_AFDATA_WUNLOCK(ifp); 792 LLE_WUNLOCK(lle_tmp); 793 lltable_free_entry(llt, lle); 794 return (EPERM); 795 } 796 /* Unlink existing entry from table */ 797 lltable_unlink_entry(llt, lle_tmp); 798 } 799 lltable_link_entry(llt, lle); 800 IF_AFDATA_WUNLOCK(ifp); 801 802 if (lle_tmp != NULL) { 803 EVENTHANDLER_INVOKE(lle_event, lle_tmp,LLENTRY_EXPIRED); 804 lltable_free_entry(llt, lle_tmp); 805 } 806 807 /* 808 * By invoking LLE handler here we might get 809 * two events on static LLE entry insertion 810 * in routing socket. However, since we might have 811 * other subscribers we need to generate this event. 812 */ 813 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_RESOLVED); 814 LLE_WUNLOCK(lle); 815 #ifdef INET 816 /* gratuitous ARP */ 817 if ((laflags & LLE_PUB) && dst->sa_family == AF_INET) 818 arprequest(ifp, 819 &((struct sockaddr_in *)dst)->sin_addr, 820 &((struct sockaddr_in *)dst)->sin_addr, 821 (u_char *)LLADDR(dl)); 822 #endif 823 824 break; 825 826 case RTM_DELETE: 827 return (lltable_delete_addr(llt, 0, dst)); 828 829 default: 830 error = EINVAL; 831 } 832 833 return (error); 834 } 835 836 #ifdef DDB 837 struct llentry_sa { 838 struct llentry base; 839 struct sockaddr l3_addr; 840 }; 841 842 static void 843 llatbl_lle_show(struct llentry_sa *la) 844 { 845 struct llentry *lle; 846 uint8_t octet[6]; 847 848 lle = &la->base; 849 db_printf("lle=%p\n", lle); 850 db_printf(" lle_next=%p\n", lle->lle_next.cle_next); 851 db_printf(" lle_lock=%p\n", &lle->lle_lock); 852 db_printf(" lle_tbl=%p\n", lle->lle_tbl); 853 db_printf(" lle_head=%p\n", lle->lle_head); 854 db_printf(" la_hold=%p\n", lle->la_hold); 855 db_printf(" la_numheld=%d\n", lle->la_numheld); 856 db_printf(" la_expire=%ju\n", (uintmax_t)lle->la_expire); 857 db_printf(" la_flags=0x%04x\n", lle->la_flags); 858 db_printf(" la_asked=%u\n", lle->la_asked); 859 db_printf(" la_preempt=%u\n", lle->la_preempt); 860 db_printf(" ln_state=%d\n", lle->ln_state); 861 db_printf(" ln_router=%u\n", lle->ln_router); 862 db_printf(" ln_ntick=%ju\n", (uintmax_t)lle->ln_ntick); 863 db_printf(" lle_refcnt=%d\n", lle->lle_refcnt); 864 bcopy(lle->ll_addr, octet, sizeof(octet)); 865 db_printf(" ll_addr=%02x:%02x:%02x:%02x:%02x:%02x\n", 866 octet[0], octet[1], octet[2], octet[3], octet[4], octet[5]); 867 db_printf(" lle_timer=%p\n", &lle->lle_timer); 868 869 switch (la->l3_addr.sa_family) { 870 #ifdef INET 871 case AF_INET: 872 { 873 struct sockaddr_in *sin; 874 char l3s[INET_ADDRSTRLEN]; 875 876 sin = (struct sockaddr_in *)&la->l3_addr; 877 inet_ntoa_r(sin->sin_addr, l3s); 878 db_printf(" l3_addr=%s\n", l3s); 879 break; 880 } 881 #endif 882 #ifdef INET6 883 case AF_INET6: 884 { 885 struct sockaddr_in6 *sin6; 886 char l3s[INET6_ADDRSTRLEN]; 887 888 sin6 = (struct sockaddr_in6 *)&la->l3_addr; 889 ip6_sprintf(l3s, &sin6->sin6_addr); 890 db_printf(" l3_addr=%s\n", l3s); 891 break; 892 } 893 #endif 894 default: 895 db_printf(" l3_addr=N/A (af=%d)\n", la->l3_addr.sa_family); 896 break; 897 } 898 } 899 900 DB_SHOW_COMMAND(llentry, db_show_llentry) 901 { 902 903 if (!have_addr) { 904 db_printf("usage: show llentry <struct llentry *>\n"); 905 return; 906 } 907 908 llatbl_lle_show((struct llentry_sa *)addr); 909 } 910 911 static void 912 llatbl_llt_show(struct lltable *llt) 913 { 914 int i; 915 struct llentry *lle; 916 917 db_printf("llt=%p llt_af=%d llt_ifp=%p\n", 918 llt, llt->llt_af, llt->llt_ifp); 919 920 for (i = 0; i < llt->llt_hsize; i++) { 921 CK_LIST_FOREACH(lle, &llt->lle_head[i], lle_next) { 922 923 llatbl_lle_show((struct llentry_sa *)lle); 924 if (db_pager_quit) 925 return; 926 } 927 } 928 } 929 930 DB_SHOW_COMMAND(lltable, db_show_lltable) 931 { 932 933 if (!have_addr) { 934 db_printf("usage: show lltable <struct lltable *>\n"); 935 return; 936 } 937 938 llatbl_llt_show((struct lltable *)addr); 939 } 940 941 DB_SHOW_ALL_COMMAND(lltables, db_show_all_lltables) 942 { 943 VNET_ITERATOR_DECL(vnet_iter); 944 struct lltable *llt; 945 946 VNET_FOREACH(vnet_iter) { 947 CURVNET_SET_QUIET(vnet_iter); 948 #ifdef VIMAGE 949 db_printf("vnet=%p\n", curvnet); 950 #endif 951 SLIST_FOREACH(llt, &V_lltables, llt_link) { 952 db_printf("llt=%p llt_af=%d llt_ifp=%p(%s)\n", 953 llt, llt->llt_af, llt->llt_ifp, 954 (llt->llt_ifp != NULL) ? 955 llt->llt_ifp->if_xname : "?"); 956 if (have_addr && addr != 0) /* verbose */ 957 llatbl_llt_show(llt); 958 if (db_pager_quit) { 959 CURVNET_RESTORE(); 960 return; 961 } 962 } 963 CURVNET_RESTORE(); 964 } 965 } 966 #endif 967