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.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
32 #include "opt_inet6.h"
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/malloc.h>
38 #include <sys/syslog.h>
39 #include <sys/sysctl.h>
40 #include <sys/socket.h>
41 #include <sys/kernel.h>
43 #include <sys/mutex.h>
44 #include <sys/rwlock.h>
52 #include <netinet/in.h>
53 #include <net/if_llatbl.h>
55 #include <net/if_dl.h>
56 #include <net/if_var.h>
57 #include <net/route.h>
59 #include <netinet/if_ether.h>
60 #include <netinet6/in6_var.h>
61 #include <netinet6/nd6.h>
63 MALLOC_DEFINE(M_LLTABLE, "lltable", "link level address tables");
65 static VNET_DEFINE(SLIST_HEAD(, lltable), lltables);
66 #define V_lltables VNET(lltables)
68 static void vnet_lltable_init(void);
70 struct rwlock lltable_rwlock;
71 RW_SYSINIT(lltable_rwlock, &lltable_rwlock, "lltable_rwlock");
74 * Dump arp state for a specific address family.
77 lltable_sysctl_dumparp(int af, struct sysctl_req *wr)
83 SLIST_FOREACH(llt, &V_lltables, llt_link) {
84 if (llt->llt_af == af) {
85 error = llt->llt_dump(llt, wr);
96 * Deletes an address from the address table.
97 * This function is called by the timer functions
98 * such as arptimer() and nd6_llinfo_timer(), and
99 * the caller does the locking.
101 * Returns the number of held packets, if any, that were dropped.
104 llentry_free(struct llentry *lle)
109 IF_AFDATA_WLOCK_ASSERT(lle->lle_tbl->llt_ifp);
110 LLE_WLOCK_ASSERT(lle);
112 LIST_REMOVE(lle, lle_next);
113 lle->la_flags &= ~(LLE_VALID | LLE_LINKED);
116 while ((lle->la_numheld > 0) && (lle->la_hold != NULL)) {
117 next = lle->la_hold->m_nextpkt;
118 m_freem(lle->la_hold);
124 KASSERT(lle->la_numheld == 0,
125 ("%s: la_numheld %d > 0, pkts_droped %zd", __func__,
126 lle->la_numheld, pkts_dropped));
128 LLE_FREE_LOCKED(lle);
130 return (pkts_dropped);
134 * (al)locate an llentry for address dst (equivalent to rtalloc for new-arp).
136 * If found the llentry * is returned referenced and unlocked.
139 llentry_alloc(struct ifnet *ifp, struct lltable *lt,
140 struct sockaddr_storage *dst)
144 IF_AFDATA_RLOCK(ifp);
145 la = lla_lookup(lt, LLE_EXCLUSIVE, (struct sockaddr *)dst);
146 IF_AFDATA_RUNLOCK(ifp);
148 (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0) {
149 IF_AFDATA_WLOCK(ifp);
150 la = lla_lookup(lt, (LLE_CREATE | LLE_EXCLUSIVE),
151 (struct sockaddr *)dst);
152 IF_AFDATA_WUNLOCK(ifp);
164 * Free all entries from given table and free itself.
167 lltable_free(struct lltable *llt)
169 struct llentry *lle, *next;
172 KASSERT(llt != NULL, ("%s: llt is NULL", __func__));
175 SLIST_REMOVE(&V_lltables, llt, lltable, llt_link);
178 IF_AFDATA_WLOCK(llt->llt_ifp);
179 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
180 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
182 if (callout_stop(&lle->la_timer))
187 IF_AFDATA_WUNLOCK(llt->llt_ifp);
189 free(llt, M_LLTABLE);
194 lltable_drain(int af)
201 SLIST_FOREACH(llt, &V_lltables, llt_link) {
202 if (llt->llt_af != af)
205 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
206 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
209 m_freem(lle->la_hold);
221 lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask,
227 SLIST_FOREACH(llt, &V_lltables, llt_link) {
228 if (llt->llt_af != af)
231 llt->llt_prefix_free(llt, prefix, mask, flags);
239 * Create a new lltable.
242 lltable_init(struct ifnet *ifp, int af)
247 llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK);
251 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++)
252 LIST_INIT(&llt->lle_head[i]);
255 SLIST_INSERT_HEAD(&V_lltables, llt, llt_link);
262 * Called in route_output when adding/deleting a route to an interface.
265 lla_rt_output(struct rt_msghdr *rtm, struct rt_addrinfo *info)
267 struct sockaddr_dl *dl =
268 (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY];
269 struct sockaddr *dst = (struct sockaddr *)info->rti_info[RTAX_DST];
273 u_int laflags = 0, flags = 0;
276 KASSERT(dl != NULL && dl->sdl_family == AF_LINK,
277 ("%s: invalid dl\n", __func__));
279 ifp = ifnet_byindex(dl->sdl_index);
281 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n",
282 __func__, dl->sdl_index);
286 switch (rtm->rtm_type) {
288 if (rtm->rtm_flags & RTF_ANNOUNCE)
301 return EINVAL; /* XXX not implemented yet */
304 /* XXX linked list may be too expensive */
306 SLIST_FOREACH(llt, &V_lltables, llt_link) {
307 if (llt->llt_af == dst->sa_family &&
312 KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n"));
314 if (flags & LLE_CREATE)
315 flags |= LLE_EXCLUSIVE;
318 lle = lla_lookup(llt, flags, dst);
319 IF_AFDATA_UNLOCK(ifp);
320 if (LLE_IS_VALID(lle)) {
321 if (flags & LLE_CREATE) {
323 * If we delay the delete, then a subsequent
324 * "arp add" should look up this entry, reset the
325 * LLE_DELETED flag, and reset the expiration timer
327 bcopy(LLADDR(dl), &lle->ll_addr, ifp->if_addrlen);
328 lle->la_flags |= (flags & LLE_PUB);
329 lle->la_flags |= LLE_VALID;
330 lle->la_flags &= ~LLE_DELETED;
335 if (dst->sa_family == AF_INET6)
336 lle->ln_state = ND6_LLINFO_REACHABLE;
339 * NB: arp and ndp always set (RTF_STATIC | RTF_HOST)
342 if (rtm->rtm_rmx.rmx_expire == 0) {
343 lle->la_flags |= LLE_STATIC;
346 lle->la_expire = rtm->rtm_rmx.rmx_expire;
347 laflags = lle->la_flags;
351 if ((laflags & LLE_PUB) && dst->sa_family == AF_INET)
353 &((struct sockaddr_in *)dst)->sin_addr,
354 &((struct sockaddr_in *)dst)->sin_addr,
355 (u_char *)LLADDR(dl));
358 if (flags & LLE_EXCLUSIVE)
363 } else if ((lle == NULL) && (flags & LLE_DELETE))
374 SLIST_INIT(&V_lltables);
376 VNET_SYSINIT(vnet_lltable_init, SI_SUB_PSEUDO, SI_ORDER_FIRST,
377 vnet_lltable_init, NULL);
382 struct sockaddr l3_addr;
386 llatbl_lle_show(struct llentry_sa *la)
392 db_printf("lle=%p\n", lle);
393 db_printf(" lle_next=%p\n", lle->lle_next.le_next);
394 db_printf(" lle_lock=%p\n", &lle->lle_lock);
395 db_printf(" lle_tbl=%p\n", lle->lle_tbl);
396 db_printf(" lle_head=%p\n", lle->lle_head);
397 db_printf(" la_hold=%p\n", lle->la_hold);
398 db_printf(" la_numheld=%d\n", lle->la_numheld);
399 db_printf(" la_expire=%ju\n", (uintmax_t)lle->la_expire);
400 db_printf(" la_flags=0x%04x\n", lle->la_flags);
401 db_printf(" la_asked=%u\n", lle->la_asked);
402 db_printf(" la_preempt=%u\n", lle->la_preempt);
403 db_printf(" ln_byhint=%u\n", lle->ln_byhint);
404 db_printf(" ln_state=%d\n", lle->ln_state);
405 db_printf(" ln_router=%u\n", lle->ln_router);
406 db_printf(" ln_ntick=%ju\n", (uintmax_t)lle->ln_ntick);
407 db_printf(" lle_refcnt=%d\n", lle->lle_refcnt);
408 bcopy(&lle->ll_addr.mac16, octet, sizeof(octet));
409 db_printf(" ll_addr=%02x:%02x:%02x:%02x:%02x:%02x\n",
410 octet[0], octet[1], octet[2], octet[3], octet[4], octet[5]);
411 db_printf(" la_timer=%p\n", &lle->la_timer);
413 switch (la->l3_addr.sa_family) {
417 struct sockaddr_in *sin;
418 char l3s[INET_ADDRSTRLEN];
420 sin = (struct sockaddr_in *)&la->l3_addr;
421 inet_ntoa_r(sin->sin_addr, l3s);
422 db_printf(" l3_addr=%s\n", l3s);
429 struct sockaddr_in6 *sin6;
430 char l3s[INET6_ADDRSTRLEN];
432 sin6 = (struct sockaddr_in6 *)&la->l3_addr;
433 ip6_sprintf(l3s, &sin6->sin6_addr);
434 db_printf(" l3_addr=%s\n", l3s);
439 db_printf(" l3_addr=N/A (af=%d)\n", la->l3_addr.sa_family);
444 DB_SHOW_COMMAND(llentry, db_show_llentry)
448 db_printf("usage: show llentry <struct llentry *>\n");
452 llatbl_lle_show((struct llentry_sa *)addr);
456 llatbl_llt_show(struct lltable *llt)
461 db_printf("llt=%p llt_af=%d llt_ifp=%p\n",
462 llt, llt->llt_af, llt->llt_ifp);
464 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
465 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
467 llatbl_lle_show((struct llentry_sa *)lle);
474 DB_SHOW_COMMAND(lltable, db_show_lltable)
478 db_printf("usage: show lltable <struct lltable *>\n");
482 llatbl_llt_show((struct lltable *)addr);
485 DB_SHOW_ALL_COMMAND(lltables, db_show_all_lltables)
487 VNET_ITERATOR_DECL(vnet_iter);
490 VNET_FOREACH(vnet_iter) {
491 CURVNET_SET_QUIET(vnet_iter);
493 db_printf("vnet=%p\n", curvnet);
495 SLIST_FOREACH(llt, &V_lltables, llt_link) {
496 db_printf("llt=%p llt_af=%d llt_ifp=%p(%s)\n",
497 llt, llt->llt_af, llt->llt_ifp,
498 (llt->llt_ifp != NULL) ?
499 llt->llt_ifp->if_xname : "?");
500 if (have_addr && addr != 0) /* verbose */
501 llatbl_llt_show(llt);