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("$FreeBSD$");
31 #include "opt_inet6.h"
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/malloc.h>
37 #include <sys/syslog.h>
38 #include <sys/sysctl.h>
39 #include <sys/socket.h>
40 #include <sys/kernel.h>
42 #include <sys/mutex.h>
43 #include <sys/rwlock.h>
47 #include <netinet/in.h>
48 #include <net/if_llatbl.h>
50 #include <net/if_dl.h>
51 #include <net/if_var.h>
52 #include <net/route.h>
54 #include <netinet/if_ether.h>
55 #include <netinet6/in6_var.h>
56 #include <netinet6/nd6.h>
58 MALLOC_DEFINE(M_LLTABLE, "lltable", "link level address tables");
60 static SLIST_HEAD(, lltable) lltables = SLIST_HEAD_INITIALIZER(lltables);
62 extern void arprequest(struct ifnet *, struct in_addr *, struct in_addr *,
65 struct rwlock lltable_rwlock;
66 RW_SYSINIT(lltable_rwlock, &lltable_rwlock, "lltable_rwlock");
69 * Dump arp state for a specific address family.
72 lltable_sysctl_dumparp(int af, struct sysctl_req *wr)
78 SLIST_FOREACH(llt, &lltables, llt_link) {
79 if (llt->llt_af == af) {
80 error = llt->llt_dump(llt, wr);
91 * Deletes an address from the address table.
92 * This function is called by the timer functions
93 * such as arptimer() and nd6_llinfo_timer(), and
94 * the caller does the locking.
97 llentry_free(struct llentry *lle)
100 LLE_WLOCK_ASSERT(lle);
101 LIST_REMOVE(lle, lle_next);
103 if (lle->la_hold != NULL)
104 m_freem(lle->la_hold);
106 LLE_FREE_LOCKED(lle);
110 * Update an llentry for address dst (equivalent to rtalloc for new-arp)
111 * Caller must pass in a valid struct llentry *
113 * if found the llentry * is returned referenced and unlocked
116 llentry_update(struct llentry **llep, struct lltable *lt,
117 struct sockaddr *dst, struct ifnet *ifp)
121 IF_AFDATA_RLOCK(ifp);
122 la = lla_lookup(lt, LLE_EXCLUSIVE,
123 (struct sockaddr *)dst);
124 IF_AFDATA_RUNLOCK(ifp);
126 (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0) {
127 IF_AFDATA_WLOCK(ifp);
129 (LLE_CREATE | LLE_EXCLUSIVE),
130 (struct sockaddr *)dst);
131 IF_AFDATA_WUNLOCK(ifp);
133 if (la != NULL && (*llep != la)) {
139 } else if (la != NULL)
149 * Free all entries from given table and free itself.
152 lltable_free(struct lltable *llt)
154 struct llentry *lle, *next;
157 KASSERT(llt != NULL, ("%s: llt is NULL", __func__));
160 SLIST_REMOVE(&lltables, llt, lltable, llt_link);
163 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
164 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
166 callout_drain(&lle->la_timer);
172 free(llt, M_LLTABLE);
176 lltable_drain(int af)
183 SLIST_FOREACH(llt, &lltables, llt_link) {
184 if (llt->llt_af != af)
187 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
188 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
190 m_freem(lle->la_hold);
200 lltable_prefix_free(int af, struct sockaddr *prefix, struct sockaddr *mask)
205 SLIST_FOREACH(llt, &lltables, llt_link) {
206 if (llt->llt_af != af)
209 llt->llt_prefix_free(llt, prefix, mask);
217 * Create a new lltable.
220 lltable_init(struct ifnet *ifp, int af)
225 llt = malloc(sizeof(struct lltable), M_LLTABLE, M_WAITOK);
231 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++)
232 LIST_INIT(&llt->lle_head[i]);
235 SLIST_INSERT_HEAD(&lltables, llt, llt_link);
242 * Called in route_output when adding/deleting a route to an interface.
245 lla_rt_output(struct rt_msghdr *rtm, struct rt_addrinfo *info)
247 struct sockaddr_dl *dl =
248 (struct sockaddr_dl *)info->rti_info[RTAX_GATEWAY];
249 struct sockaddr *dst = (struct sockaddr *)info->rti_info[RTAX_DST];
253 u_int laflags = 0, flags = 0;
256 if (dl == NULL || dl->sdl_family != AF_LINK) {
257 log(LOG_INFO, "%s: invalid dl\n", __func__);
260 ifp = ifnet_byindex(dl->sdl_index);
262 log(LOG_INFO, "%s: invalid ifp (sdl_index %d)\n",
263 __func__, dl->sdl_index);
267 switch (rtm->rtm_type) {
269 if (rtm->rtm_flags & RTF_ANNOUNCE) {
272 if (dst->sa_family == AF_INET &&
273 ((struct sockaddr_inarp *)dst)->sin_other != 0) {
274 struct rtentry *rt = rtalloc1(dst, 0, 0);
275 if (rt == NULL || !(rt->rt_flags & RTF_HOST)) {
276 log(LOG_INFO, "%s: RTM_ADD publish "
277 "(proxy only) is invalid\n",
300 return EINVAL; /* XXX not implemented yet */
303 /* XXX linked list may be too expensive */
305 SLIST_FOREACH(llt, &lltables, llt_link) {
306 if (llt->llt_af == dst->sa_family &&
311 KASSERT(llt != NULL, ("Yep, ugly hacks are bad\n"));
313 if (flags && LLE_CREATE)
314 flags |= LLE_EXCLUSIVE;
317 lle = lla_lookup(llt, flags, dst);
318 IF_AFDATA_UNLOCK(ifp);
319 if (LLE_IS_VALID(lle)) {
320 if (flags & LLE_CREATE) {
322 * If we delay the delete, then a subsequent
323 * "arp add" should look up this entry, reset the
324 * LLE_DELETED flag, and reset the expiration timer
326 bcopy(LLADDR(dl), &lle->ll_addr, ifp->if_addrlen);
327 lle->la_flags |= LLE_VALID;
328 lle->la_flags &= ~LLE_DELETED;
333 if (dst->sa_family == AF_INET6)
334 lle->ln_state = ND6_LLINFO_REACHABLE;
337 * NB: arp and ndp always set (RTF_STATIC | RTF_HOST)
340 if (rtm->rtm_rmx.rmx_expire == 0) {
341 lle->la_flags |= LLE_STATIC;
344 lle->la_expire = rtm->rtm_rmx.rmx_expire;
345 laflags = lle->la_flags;
349 if ((laflags & LLE_PUB) && dst->sa_family == AF_INET) {
351 &((struct sockaddr_in *)dst)->sin_addr,
352 &((struct sockaddr_in *)dst)->sin_addr,
353 ((laflags & LLE_PROXY) ?
354 (u_char *)IF_LLADDR(ifp) :
355 (u_char *)LLADDR(dl)));
359 if (flags & LLE_EXCLUSIVE)
364 } else if ((lle == NULL) && (flags & LLE_DELETE))