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)
110 LLE_WLOCK_ASSERT(lle);
111 LIST_REMOVE(lle, lle_next);
113 while ((lle->la_numheld > 0) && (lle->la_hold != NULL)) {
114 next = lle->la_hold->m_nextpkt;
115 m_freem(lle->la_hold);
121 KASSERT(lle->la_numheld == 0,
122 ("%s: la_numheld %d > 0, pkts_droped %zd", __func__,
123 lle->la_numheld, pkts_dropped));
125 lle->la_flags &= ~LLE_VALID;
126 LLE_FREE_LOCKED(lle);
128 return (pkts_dropped);
132 * Update an llentry for address dst (equivalent to rtalloc for new-arp)
133 * Caller must pass in a valid struct llentry * (or NULL)
135 * if found the llentry * is returned referenced and unlocked
138 llentry_update(struct llentry **llep, struct lltable *lt,
139 struct sockaddr_storage *dst, struct ifnet *ifp)
143 IF_AFDATA_RLOCK(ifp);
144 la = lla_lookup(lt, LLE_EXCLUSIVE,
145 (struct sockaddr *)dst);
146 IF_AFDATA_RUNLOCK(ifp);
148 (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0) {
149 IF_AFDATA_WLOCK(ifp);
151 (LLE_CREATE | LLE_EXCLUSIVE),
152 (struct sockaddr *)dst);
153 IF_AFDATA_WUNLOCK(ifp);
155 if (la != NULL && (*llep != la)) {
161 } else if (la != NULL)
171 * Free all entries from given table and free itself.
174 lltable_free(struct lltable *llt)
176 struct llentry *lle, *next;
179 KASSERT(llt != NULL, ("%s: llt is NULL", __func__));
182 SLIST_REMOVE(&V_lltables, llt, lltable, llt_link);
185 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
186 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
189 canceled = callout_drain(&lle->la_timer);
197 free(llt, M_LLTABLE);
202 lltable_drain(int af)
209 SLIST_FOREACH(llt, &V_lltables, llt_link) {
210 if (llt->llt_af != af)
213 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
214 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
217 m_freem(lle->la_hold);
229 lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask,
235 SLIST_FOREACH(llt, &V_lltables, llt_link) {
236 if (llt->llt_af != af)
239 llt->llt_prefix_free(llt, prefix, mask, flags);
247 * Create a new lltable.
250 lltable_init(struct ifnet *ifp, int af)
255 llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK);
259 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++)
260 LIST_INIT(&llt->lle_head[i]);
263 SLIST_INSERT_HEAD(&V_lltables, llt, llt_link);
270 * Called in route_output when adding/deleting a route to an interface.
273 lla_rt_output(struct rt_msghdr *rtm, struct rt_addrinfo *info)
275 struct sockaddr_dl *dl =
276 (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY];
277 struct sockaddr *dst = (struct sockaddr *)info->rti_info[RTAX_DST];
281 u_int laflags = 0, flags = 0;
284 if (dl == NULL || dl->sdl_family != AF_LINK) {
285 log(LOG_INFO, "%s: invalid dl\n", __func__);
288 ifp = ifnet_byindex(dl->sdl_index);
290 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n",
291 __func__, dl->sdl_index);
295 switch (rtm->rtm_type) {
297 if (rtm->rtm_flags & RTF_ANNOUNCE) {
300 if (dst->sa_family == AF_INET &&
301 ((struct sockaddr_inarp *)dst)->sin_other != 0) {
303 ((struct sockaddr_inarp *)dst)->sin_other = 0;
304 rt = rtalloc1(dst, 0, 0);
305 if (rt == NULL || !(rt->rt_flags & RTF_HOST)) {
306 log(LOG_INFO, "%s: RTM_ADD publish "
307 "(proxy only) is invalid\n",
330 return EINVAL; /* XXX not implemented yet */
333 /* XXX linked list may be too expensive */
335 SLIST_FOREACH(llt, &V_lltables, llt_link) {
336 if (llt->llt_af == dst->sa_family &&
341 KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n"));
343 if (flags & LLE_CREATE)
344 flags |= LLE_EXCLUSIVE;
347 lle = lla_lookup(llt, flags, dst);
348 IF_AFDATA_UNLOCK(ifp);
349 if (LLE_IS_VALID(lle)) {
350 if (flags & LLE_CREATE) {
352 * If we delay the delete, then a subsequent
353 * "arp add" should look up this entry, reset the
354 * LLE_DELETED flag, and reset the expiration timer
356 bcopy(LLADDR(dl), &lle->ll_addr, ifp->if_addrlen);
357 lle->la_flags |= (flags & (LLE_PUB | LLE_PROXY));
358 lle->la_flags |= LLE_VALID;
359 lle->la_flags &= ~LLE_DELETED;
364 if (dst->sa_family == AF_INET6)
365 lle->ln_state = ND6_LLINFO_REACHABLE;
368 * NB: arp and ndp always set (RTF_STATIC | RTF_HOST)
371 if (rtm->rtm_rmx.rmx_expire == 0) {
372 lle->la_flags |= LLE_STATIC;
375 lle->la_expire = rtm->rtm_rmx.rmx_expire;
376 laflags = lle->la_flags;
380 if ((laflags & LLE_PUB) && dst->sa_family == AF_INET) {
382 &((struct sockaddr_in *)dst)->sin_addr,
383 &((struct sockaddr_in *)dst)->sin_addr,
384 ((laflags & LLE_PROXY) ?
385 (u_char *)IF_LLADDR(ifp) :
386 (u_char *)LLADDR(dl)));
390 if (flags & LLE_EXCLUSIVE)
395 } else if ((lle == NULL) && (flags & LLE_DELETE))
406 SLIST_INIT(&V_lltables);
408 VNET_SYSINIT(vnet_lltable_init, SI_SUB_PSEUDO, SI_ORDER_FIRST,
409 vnet_lltable_init, NULL);
414 struct sockaddr l3_addr;
418 llatbl_lle_show(struct llentry_sa *la)
424 db_printf("lle=%p\n", lle);
425 db_printf(" lle_next=%p\n", lle->lle_next.le_next);
426 db_printf(" lle_lock=%p\n", &lle->lle_lock);
427 db_printf(" lle_tbl=%p\n", lle->lle_tbl);
428 db_printf(" lle_head=%p\n", lle->lle_head);
429 db_printf(" la_hold=%p\n", lle->la_hold);
430 db_printf(" la_numheld=%d\n", lle->la_numheld);
431 db_printf(" la_expire=%ju\n", (uintmax_t)lle->la_expire);
432 db_printf(" la_flags=0x%04x\n", lle->la_flags);
433 db_printf(" la_asked=%u\n", lle->la_asked);
434 db_printf(" la_preempt=%u\n", lle->la_preempt);
435 db_printf(" ln_byhint=%u\n", lle->ln_byhint);
436 db_printf(" ln_state=%d\n", lle->ln_state);
437 db_printf(" ln_router=%u\n", lle->ln_router);
438 db_printf(" ln_ntick=%ju\n", (uintmax_t)lle->ln_ntick);
439 db_printf(" lle_refcnt=%d\n", lle->lle_refcnt);
440 bcopy(&lle->ll_addr.mac16, octet, sizeof(octet));
441 db_printf(" ll_addr=%02x:%02x:%02x:%02x:%02x:%02x\n",
442 octet[0], octet[1], octet[2], octet[3], octet[4], octet[5]);
443 db_printf(" la_timer=%p\n", &lle->la_timer);
445 switch (la->l3_addr.sa_family) {
449 struct sockaddr_in *sin;
450 char l3s[INET_ADDRSTRLEN];
452 sin = (struct sockaddr_in *)&la->l3_addr;
453 inet_ntoa_r(sin->sin_addr, l3s);
454 db_printf(" l3_addr=%s\n", l3s);
461 struct sockaddr_in6 *sin6;
462 char l3s[INET6_ADDRSTRLEN];
464 sin6 = (struct sockaddr_in6 *)&la->l3_addr;
465 ip6_sprintf(l3s, &sin6->sin6_addr);
466 db_printf(" l3_addr=%s\n", l3s);
471 db_printf(" l3_addr=N/A (af=%d)\n", la->l3_addr.sa_family);
476 DB_SHOW_COMMAND(llentry, db_show_llentry)
480 db_printf("usage: show llentry <struct llentry *>\n");
484 llatbl_lle_show((struct llentry_sa *)addr);
488 llatbl_llt_show(struct lltable *llt)
493 db_printf("llt=%p llt_af=%d llt_ifp=%p\n",
494 llt, llt->llt_af, llt->llt_ifp);
496 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
497 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
499 llatbl_lle_show((struct llentry_sa *)lle);
506 DB_SHOW_COMMAND(lltable, db_show_lltable)
510 db_printf("usage: show lltable <struct lltable *>\n");
514 llatbl_llt_show((struct lltable *)addr);
517 DB_SHOW_ALL_COMMAND(lltables, db_show_all_lltables)
519 VNET_ITERATOR_DECL(vnet_iter);
522 VNET_FOREACH(vnet_iter) {
523 CURVNET_SET_QUIET(vnet_iter);
525 db_printf("vnet=%p\n", curvnet);
527 SLIST_FOREACH(llt, &V_lltables, llt_link) {
528 db_printf("llt=%p llt_af=%d llt_ifp=%p(%s)\n",
529 llt, llt->llt_af, llt->llt_ifp,
530 (llt->llt_ifp != NULL) ?
531 llt->llt_ifp->if_xname : "?");
532 if (have_addr && addr != 0) /* verbose */
533 llatbl_llt_show(llt);