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