nd6.c revision 1.64 1 1.64 itojun /* $NetBSD: nd6.c,v 1.64 2002/06/07 17:15:12 itojun Exp $ */
2 1.47 itojun /* $KAME: nd6.c,v 1.151 2001/06/19 14:24:41 sumikawa Exp $ */
3 1.4 thorpej
4 1.2 itojun /*
5 1.2 itojun * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 1.2 itojun * All rights reserved.
7 1.25 itojun *
8 1.2 itojun * Redistribution and use in source and binary forms, with or without
9 1.2 itojun * modification, are permitted provided that the following conditions
10 1.2 itojun * are met:
11 1.2 itojun * 1. Redistributions of source code must retain the above copyright
12 1.2 itojun * notice, this list of conditions and the following disclaimer.
13 1.2 itojun * 2. Redistributions in binary form must reproduce the above copyright
14 1.2 itojun * notice, this list of conditions and the following disclaimer in the
15 1.2 itojun * documentation and/or other materials provided with the distribution.
16 1.2 itojun * 3. Neither the name of the project nor the names of its contributors
17 1.2 itojun * may be used to endorse or promote products derived from this software
18 1.2 itojun * without specific prior written permission.
19 1.25 itojun *
20 1.2 itojun * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 1.2 itojun * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 1.2 itojun * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 1.2 itojun * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 1.2 itojun * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 1.2 itojun * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 1.2 itojun * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 1.2 itojun * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 1.2 itojun * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 1.2 itojun * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 1.2 itojun * SUCH DAMAGE.
31 1.2 itojun */
32 1.2 itojun
33 1.55 lukem #include <sys/cdefs.h>
34 1.64 itojun __KERNEL_RCSID(0, "$NetBSD: nd6.c,v 1.64 2002/06/07 17:15:12 itojun Exp $");
35 1.2 itojun
36 1.2 itojun #include <sys/param.h>
37 1.2 itojun #include <sys/systm.h>
38 1.20 thorpej #include <sys/callout.h>
39 1.2 itojun #include <sys/malloc.h>
40 1.2 itojun #include <sys/mbuf.h>
41 1.2 itojun #include <sys/socket.h>
42 1.2 itojun #include <sys/sockio.h>
43 1.2 itojun #include <sys/time.h>
44 1.2 itojun #include <sys/kernel.h>
45 1.18 itojun #include <sys/protosw.h>
46 1.2 itojun #include <sys/errno.h>
47 1.2 itojun #include <sys/ioctl.h>
48 1.2 itojun #include <sys/syslog.h>
49 1.2 itojun #include <sys/queue.h>
50 1.2 itojun
51 1.2 itojun #include <net/if.h>
52 1.2 itojun #include <net/if_dl.h>
53 1.2 itojun #include <net/if_types.h>
54 1.2 itojun #include <net/route.h>
55 1.62 itojun #include <net/if_ether.h>
56 1.62 itojun #include <net/if_fddi.h>
57 1.62 itojun #include <net/if_arc.h>
58 1.2 itojun
59 1.2 itojun #include <netinet/in.h>
60 1.2 itojun #include <netinet6/in6_var.h>
61 1.17 itojun #include <netinet/ip6.h>
62 1.2 itojun #include <netinet6/ip6_var.h>
63 1.2 itojun #include <netinet6/nd6.h>
64 1.12 itojun #include <netinet6/in6_prefix.h>
65 1.17 itojun #include <netinet/icmp6.h>
66 1.2 itojun
67 1.2 itojun #include "loop.h"
68 1.2 itojun extern struct ifnet loif[NLOOP];
69 1.2 itojun
70 1.12 itojun #include <net/net_osdep.h>
71 1.12 itojun
72 1.2 itojun #define ND6_SLOWTIMER_INTERVAL (60 * 60) /* 1 hour */
73 1.2 itojun #define ND6_RECALC_REACHTM_INTERVAL (60 * 120) /* 2 hours */
74 1.2 itojun
75 1.2 itojun #define SIN6(s) ((struct sockaddr_in6 *)s)
76 1.2 itojun #define SDL(s) ((struct sockaddr_dl *)s)
77 1.2 itojun
78 1.2 itojun /* timer values */
79 1.2 itojun int nd6_prune = 1; /* walk list every 1 seconds */
80 1.2 itojun int nd6_delay = 5; /* delay first probe time 5 second */
81 1.2 itojun int nd6_umaxtries = 3; /* maximum unicast query */
82 1.2 itojun int nd6_mmaxtries = 3; /* maximum multicast query */
83 1.2 itojun int nd6_useloopback = 1; /* use loopback interface for local traffic */
84 1.42 itojun int nd6_gctimer = (60 * 60 * 24); /* 1 day: garbage collection timer */
85 1.2 itojun
86 1.12 itojun /* preventing too many loops in ND option parsing */
87 1.12 itojun int nd6_maxndopt = 10; /* max # of ND options allowed */
88 1.12 itojun
89 1.31 itojun int nd6_maxnudhint = 0; /* max # of subsequent upper layer hints */
90 1.31 itojun
91 1.36 itojun #ifdef ND6_DEBUG
92 1.36 itojun int nd6_debug = 1;
93 1.36 itojun #else
94 1.36 itojun int nd6_debug = 0;
95 1.36 itojun #endif
96 1.36 itojun
97 1.2 itojun /* for debugging? */
98 1.2 itojun static int nd6_inuse, nd6_allocated;
99 1.2 itojun
100 1.2 itojun struct llinfo_nd6 llinfo_nd6 = {&llinfo_nd6, &llinfo_nd6};
101 1.12 itojun struct nd_drhead nd_defrouter;
102 1.2 itojun struct nd_prhead nd_prefix = { 0 };
103 1.2 itojun
104 1.2 itojun int nd6_recalc_reachtm_interval = ND6_RECALC_REACHTM_INTERVAL;
105 1.12 itojun static struct sockaddr_in6 all1_sa;
106 1.2 itojun
107 1.61 itojun static void nd6_setmtu0 __P((struct ifnet *, struct nd_ifinfo *));
108 1.2 itojun static void nd6_slowtimo __P((void *));
109 1.54 itojun static struct llinfo_nd6 *nd6_free __P((struct rtentry *, int));
110 1.2 itojun
111 1.20 thorpej struct callout nd6_slowtimo_ch;
112 1.20 thorpej struct callout nd6_timer_ch;
113 1.20 thorpej
114 1.2 itojun void
115 1.2 itojun nd6_init()
116 1.2 itojun {
117 1.2 itojun static int nd6_init_done = 0;
118 1.12 itojun int i;
119 1.2 itojun
120 1.2 itojun if (nd6_init_done) {
121 1.2 itojun log(LOG_NOTICE, "nd6_init called more than once(ignored)\n");
122 1.2 itojun return;
123 1.2 itojun }
124 1.12 itojun
125 1.12 itojun all1_sa.sin6_family = AF_INET6;
126 1.12 itojun all1_sa.sin6_len = sizeof(struct sockaddr_in6);
127 1.12 itojun for (i = 0; i < sizeof(all1_sa.sin6_addr); i++)
128 1.12 itojun all1_sa.sin6_addr.s6_addr[i] = 0xff;
129 1.12 itojun
130 1.12 itojun /* initialization of the default router list */
131 1.12 itojun TAILQ_INIT(&nd_defrouter);
132 1.12 itojun
133 1.2 itojun nd6_init_done = 1;
134 1.2 itojun
135 1.2 itojun /* start timer */
136 1.20 thorpej callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
137 1.20 thorpej nd6_slowtimo, NULL);
138 1.2 itojun }
139 1.2 itojun
140 1.58 itojun struct nd_ifinfo *
141 1.2 itojun nd6_ifattach(ifp)
142 1.2 itojun struct ifnet *ifp;
143 1.2 itojun {
144 1.58 itojun struct nd_ifinfo *nd;
145 1.2 itojun
146 1.58 itojun nd = (struct nd_ifinfo *)malloc(sizeof(*nd), M_IP6NDP, M_WAITOK);
147 1.58 itojun bzero(nd, sizeof(*nd));
148 1.2 itojun
149 1.58 itojun nd->initialized = 1;
150 1.2 itojun
151 1.58 itojun nd->chlim = IPV6_DEFHLIM;
152 1.58 itojun nd->basereachable = REACHABLE_TIME;
153 1.58 itojun nd->reachable = ND_COMPUTE_RTIME(nd->basereachable);
154 1.58 itojun nd->retrans = RETRANS_TIMER;
155 1.58 itojun nd->flags = ND6_IFF_PERFORMNUD;
156 1.61 itojun
157 1.61 itojun /* XXX: we cannot call nd6_setmtu since ifp is not fully initialized */
158 1.61 itojun nd6_setmtu0(ifp, nd);
159 1.2 itojun
160 1.58 itojun return nd;
161 1.58 itojun }
162 1.21 itojun
163 1.58 itojun void
164 1.58 itojun nd6_ifdetach(nd)
165 1.58 itojun struct nd_ifinfo *nd;
166 1.58 itojun {
167 1.21 itojun
168 1.58 itojun free(nd, M_IP6NDP);
169 1.2 itojun }
170 1.2 itojun
171 1.2 itojun void
172 1.61 itojun nd6_setmtu(ifp)
173 1.61 itojun struct ifnet *ifp;
174 1.61 itojun {
175 1.61 itojun nd6_setmtu0(ifp, ND_IFINFO(ifp));
176 1.61 itojun }
177 1.61 itojun
178 1.61 itojun void
179 1.61 itojun nd6_setmtu0(ifp, ndi)
180 1.2 itojun struct ifnet *ifp;
181 1.58 itojun struct nd_ifinfo *ndi;
182 1.2 itojun {
183 1.61 itojun u_int32_t omaxmtu;
184 1.61 itojun
185 1.61 itojun omaxmtu = ndi->maxmtu;
186 1.2 itojun
187 1.40 itojun switch (ifp->if_type) {
188 1.62 itojun case IFT_ARCNET:
189 1.62 itojun ndi->maxmtu = MIN(ARC_PHDS_MAXMTU, ifp->if_mtu); /* RFC2497 */
190 1.39 itojun break;
191 1.58 itojun case IFT_FDDI:
192 1.58 itojun ndi->maxmtu = MIN(FDDIIPMTU, ifp->if_mtu);
193 1.58 itojun break;
194 1.39 itojun default:
195 1.39 itojun ndi->maxmtu = ifp->if_mtu;
196 1.39 itojun break;
197 1.2 itojun }
198 1.2 itojun
199 1.61 itojun /*
200 1.61 itojun * Decreasing the interface MTU under IPV6 minimum MTU may cause
201 1.61 itojun * undesirable situation. We thus notify the operator of the change
202 1.61 itojun * explicitly. The check for omaxmtu is necessary to restrict the
203 1.63 itojun * log to the case of changing the MTU, not initializing it.
204 1.61 itojun */
205 1.61 itojun if (omaxmtu >= IPV6_MMTU && ndi->maxmtu < IPV6_MMTU) {
206 1.61 itojun log(LOG_NOTICE, "nd6_setmtu0: "
207 1.61 itojun "new link MTU on %s (%lu) is too small for IPv6\n",
208 1.61 itojun if_name(ifp), (unsigned long)ndi->maxmtu);
209 1.2 itojun }
210 1.58 itojun
211 1.58 itojun if (ndi->maxmtu > in6_maxmtu)
212 1.58 itojun in6_setmaxmtu(); /* check all interfaces just in case */
213 1.2 itojun }
214 1.2 itojun
215 1.2 itojun void
216 1.2 itojun nd6_option_init(opt, icmp6len, ndopts)
217 1.2 itojun void *opt;
218 1.2 itojun int icmp6len;
219 1.2 itojun union nd_opts *ndopts;
220 1.2 itojun {
221 1.58 itojun
222 1.2 itojun bzero(ndopts, sizeof(*ndopts));
223 1.2 itojun ndopts->nd_opts_search = (struct nd_opt_hdr *)opt;
224 1.2 itojun ndopts->nd_opts_last
225 1.2 itojun = (struct nd_opt_hdr *)(((u_char *)opt) + icmp6len);
226 1.2 itojun
227 1.2 itojun if (icmp6len == 0) {
228 1.2 itojun ndopts->nd_opts_done = 1;
229 1.2 itojun ndopts->nd_opts_search = NULL;
230 1.2 itojun }
231 1.2 itojun }
232 1.2 itojun
233 1.2 itojun /*
234 1.2 itojun * Take one ND option.
235 1.2 itojun */
236 1.2 itojun struct nd_opt_hdr *
237 1.2 itojun nd6_option(ndopts)
238 1.2 itojun union nd_opts *ndopts;
239 1.2 itojun {
240 1.2 itojun struct nd_opt_hdr *nd_opt;
241 1.2 itojun int olen;
242 1.2 itojun
243 1.2 itojun if (!ndopts)
244 1.2 itojun panic("ndopts == NULL in nd6_option\n");
245 1.2 itojun if (!ndopts->nd_opts_last)
246 1.2 itojun panic("uninitialized ndopts in nd6_option\n");
247 1.2 itojun if (!ndopts->nd_opts_search)
248 1.2 itojun return NULL;
249 1.2 itojun if (ndopts->nd_opts_done)
250 1.2 itojun return NULL;
251 1.2 itojun
252 1.2 itojun nd_opt = ndopts->nd_opts_search;
253 1.2 itojun
254 1.40 itojun /* make sure nd_opt_len is inside the buffer */
255 1.40 itojun if ((caddr_t)&nd_opt->nd_opt_len >= (caddr_t)ndopts->nd_opts_last) {
256 1.40 itojun bzero(ndopts, sizeof(*ndopts));
257 1.40 itojun return NULL;
258 1.40 itojun }
259 1.40 itojun
260 1.2 itojun olen = nd_opt->nd_opt_len << 3;
261 1.2 itojun if (olen == 0) {
262 1.2 itojun /*
263 1.2 itojun * Message validation requires that all included
264 1.2 itojun * options have a length that is greater than zero.
265 1.2 itojun */
266 1.2 itojun bzero(ndopts, sizeof(*ndopts));
267 1.2 itojun return NULL;
268 1.2 itojun }
269 1.2 itojun
270 1.2 itojun ndopts->nd_opts_search = (struct nd_opt_hdr *)((caddr_t)nd_opt + olen);
271 1.40 itojun if (ndopts->nd_opts_search > ndopts->nd_opts_last) {
272 1.40 itojun /* option overruns the end of buffer, invalid */
273 1.40 itojun bzero(ndopts, sizeof(*ndopts));
274 1.40 itojun return NULL;
275 1.40 itojun } else if (ndopts->nd_opts_search == ndopts->nd_opts_last) {
276 1.40 itojun /* reached the end of options chain */
277 1.2 itojun ndopts->nd_opts_done = 1;
278 1.2 itojun ndopts->nd_opts_search = NULL;
279 1.2 itojun }
280 1.2 itojun return nd_opt;
281 1.2 itojun }
282 1.2 itojun
283 1.2 itojun /*
284 1.2 itojun * Parse multiple ND options.
285 1.2 itojun * This function is much easier to use, for ND routines that do not need
286 1.2 itojun * multiple options of the same type.
287 1.2 itojun */
288 1.2 itojun int
289 1.2 itojun nd6_options(ndopts)
290 1.2 itojun union nd_opts *ndopts;
291 1.2 itojun {
292 1.2 itojun struct nd_opt_hdr *nd_opt;
293 1.2 itojun int i = 0;
294 1.2 itojun
295 1.2 itojun if (!ndopts)
296 1.2 itojun panic("ndopts == NULL in nd6_options\n");
297 1.2 itojun if (!ndopts->nd_opts_last)
298 1.2 itojun panic("uninitialized ndopts in nd6_options\n");
299 1.2 itojun if (!ndopts->nd_opts_search)
300 1.2 itojun return 0;
301 1.2 itojun
302 1.2 itojun while (1) {
303 1.2 itojun nd_opt = nd6_option(ndopts);
304 1.2 itojun if (!nd_opt && !ndopts->nd_opts_last) {
305 1.2 itojun /*
306 1.2 itojun * Message validation requires that all included
307 1.2 itojun * options have a length that is greater than zero.
308 1.2 itojun */
309 1.36 itojun icmp6stat.icp6s_nd_badopt++;
310 1.2 itojun bzero(ndopts, sizeof(*ndopts));
311 1.2 itojun return -1;
312 1.2 itojun }
313 1.2 itojun
314 1.2 itojun if (!nd_opt)
315 1.2 itojun goto skip1;
316 1.2 itojun
317 1.2 itojun switch (nd_opt->nd_opt_type) {
318 1.2 itojun case ND_OPT_SOURCE_LINKADDR:
319 1.2 itojun case ND_OPT_TARGET_LINKADDR:
320 1.2 itojun case ND_OPT_MTU:
321 1.2 itojun case ND_OPT_REDIRECTED_HEADER:
322 1.2 itojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type]) {
323 1.36 itojun nd6log((LOG_INFO,
324 1.36 itojun "duplicated ND6 option found (type=%d)\n",
325 1.36 itojun nd_opt->nd_opt_type));
326 1.2 itojun /* XXX bark? */
327 1.2 itojun } else {
328 1.2 itojun ndopts->nd_opt_array[nd_opt->nd_opt_type]
329 1.2 itojun = nd_opt;
330 1.2 itojun }
331 1.2 itojun break;
332 1.2 itojun case ND_OPT_PREFIX_INFORMATION:
333 1.2 itojun if (ndopts->nd_opt_array[nd_opt->nd_opt_type] == 0) {
334 1.2 itojun ndopts->nd_opt_array[nd_opt->nd_opt_type]
335 1.2 itojun = nd_opt;
336 1.2 itojun }
337 1.2 itojun ndopts->nd_opts_pi_end =
338 1.2 itojun (struct nd_opt_prefix_info *)nd_opt;
339 1.2 itojun break;
340 1.2 itojun default:
341 1.2 itojun /*
342 1.2 itojun * Unknown options must be silently ignored,
343 1.2 itojun * to accomodate future extension to the protocol.
344 1.2 itojun */
345 1.36 itojun nd6log((LOG_DEBUG,
346 1.2 itojun "nd6_options: unsupported option %d - "
347 1.36 itojun "option ignored\n", nd_opt->nd_opt_type));
348 1.2 itojun }
349 1.2 itojun
350 1.2 itojun skip1:
351 1.2 itojun i++;
352 1.12 itojun if (i > nd6_maxndopt) {
353 1.12 itojun icmp6stat.icp6s_nd_toomanyopt++;
354 1.36 itojun nd6log((LOG_INFO, "too many loop in nd opt\n"));
355 1.2 itojun break;
356 1.2 itojun }
357 1.2 itojun
358 1.2 itojun if (ndopts->nd_opts_done)
359 1.2 itojun break;
360 1.2 itojun }
361 1.2 itojun
362 1.2 itojun return 0;
363 1.2 itojun }
364 1.2 itojun
365 1.2 itojun /*
366 1.2 itojun * ND6 timer routine to expire default route list and prefix list
367 1.2 itojun */
368 1.2 itojun void
369 1.2 itojun nd6_timer(ignored_arg)
370 1.2 itojun void *ignored_arg;
371 1.2 itojun {
372 1.2 itojun int s;
373 1.38 itojun struct llinfo_nd6 *ln;
374 1.38 itojun struct nd_defrouter *dr;
375 1.38 itojun struct nd_prefix *pr;
376 1.12 itojun long time_second = time.tv_sec;
377 1.63 itojun
378 1.5 itojun s = splsoftnet();
379 1.20 thorpej callout_reset(&nd6_timer_ch, nd6_prune * hz,
380 1.20 thorpej nd6_timer, NULL);
381 1.2 itojun
382 1.2 itojun ln = llinfo_nd6.ln_next;
383 1.2 itojun while (ln && ln != &llinfo_nd6) {
384 1.2 itojun struct rtentry *rt;
385 1.2 itojun struct ifnet *ifp;
386 1.2 itojun struct sockaddr_in6 *dst;
387 1.2 itojun struct llinfo_nd6 *next = ln->ln_next;
388 1.26 itojun /* XXX: used for the DELAY case only: */
389 1.26 itojun struct nd_ifinfo *ndi = NULL;
390 1.2 itojun
391 1.2 itojun if ((rt = ln->ln_rt) == NULL) {
392 1.2 itojun ln = next;
393 1.2 itojun continue;
394 1.2 itojun }
395 1.2 itojun if ((ifp = rt->rt_ifp) == NULL) {
396 1.2 itojun ln = next;
397 1.2 itojun continue;
398 1.2 itojun }
399 1.58 itojun ndi = ND_IFINFO(ifp);
400 1.2 itojun dst = (struct sockaddr_in6 *)rt_key(rt);
401 1.2 itojun
402 1.2 itojun if (ln->ln_expire > time_second) {
403 1.2 itojun ln = next;
404 1.2 itojun continue;
405 1.2 itojun }
406 1.54 itojun
407 1.2 itojun /* sanity check */
408 1.2 itojun if (!rt)
409 1.2 itojun panic("rt=0 in nd6_timer(ln=%p)\n", ln);
410 1.25 itojun if (rt->rt_llinfo && (struct llinfo_nd6 *)rt->rt_llinfo != ln)
411 1.25 itojun panic("rt_llinfo(%p) is not equal to ln(%p)\n",
412 1.25 itojun rt->rt_llinfo, ln);
413 1.2 itojun if (!dst)
414 1.2 itojun panic("dst=0 in nd6_timer(ln=%p)\n", ln);
415 1.2 itojun
416 1.2 itojun switch (ln->ln_state) {
417 1.2 itojun case ND6_LLINFO_INCOMPLETE:
418 1.2 itojun if (ln->ln_asked < nd6_mmaxtries) {
419 1.2 itojun ln->ln_asked++;
420 1.2 itojun ln->ln_expire = time_second +
421 1.58 itojun ND6_RETRANS_SEC(ND_IFINFO(ifp)->retrans);
422 1.2 itojun nd6_ns_output(ifp, NULL, &dst->sin6_addr,
423 1.2 itojun ln, 0);
424 1.2 itojun } else {
425 1.2 itojun struct mbuf *m = ln->ln_hold;
426 1.2 itojun if (m) {
427 1.2 itojun if (rt->rt_ifp) {
428 1.2 itojun /*
429 1.2 itojun * Fake rcvif to make ICMP error
430 1.2 itojun * more helpful in diagnosing
431 1.2 itojun * for the receiver.
432 1.2 itojun * XXX: should we consider
433 1.2 itojun * older rcvif?
434 1.2 itojun */
435 1.2 itojun m->m_pkthdr.rcvif = rt->rt_ifp;
436 1.2 itojun }
437 1.2 itojun icmp6_error(m, ICMP6_DST_UNREACH,
438 1.2 itojun ICMP6_DST_UNREACH_ADDR, 0);
439 1.2 itojun ln->ln_hold = NULL;
440 1.2 itojun }
441 1.54 itojun next = nd6_free(rt, 0);
442 1.2 itojun }
443 1.2 itojun break;
444 1.2 itojun case ND6_LLINFO_REACHABLE:
445 1.42 itojun if (ln->ln_expire) {
446 1.42 itojun ln->ln_state = ND6_LLINFO_STALE;
447 1.42 itojun ln->ln_expire = time_second + nd6_gctimer;
448 1.42 itojun }
449 1.42 itojun break;
450 1.42 itojun
451 1.42 itojun case ND6_LLINFO_STALE:
452 1.42 itojun /* Garbage Collection(RFC 2461 5.3) */
453 1.18 itojun if (ln->ln_expire)
454 1.54 itojun next = nd6_free(rt, 1);
455 1.2 itojun break;
456 1.42 itojun
457 1.2 itojun case ND6_LLINFO_DELAY:
458 1.26 itojun if (ndi && (ndi->flags & ND6_IFF_PERFORMNUD) != 0) {
459 1.26 itojun /* We need NUD */
460 1.26 itojun ln->ln_asked = 1;
461 1.26 itojun ln->ln_state = ND6_LLINFO_PROBE;
462 1.26 itojun ln->ln_expire = time_second +
463 1.64 itojun ND6_RETRANS_SEC(ndi->retrans);
464 1.26 itojun nd6_ns_output(ifp, &dst->sin6_addr,
465 1.26 itojun &dst->sin6_addr,
466 1.26 itojun ln, 0);
467 1.42 itojun } else {
468 1.26 itojun ln->ln_state = ND6_LLINFO_STALE; /* XXX */
469 1.42 itojun ln->ln_expire = time_second + nd6_gctimer;
470 1.42 itojun }
471 1.2 itojun break;
472 1.2 itojun case ND6_LLINFO_PROBE:
473 1.2 itojun if (ln->ln_asked < nd6_umaxtries) {
474 1.2 itojun ln->ln_asked++;
475 1.2 itojun ln->ln_expire = time_second +
476 1.58 itojun ND6_RETRANS_SEC(ND_IFINFO(ifp)->retrans);
477 1.2 itojun nd6_ns_output(ifp, &dst->sin6_addr,
478 1.2 itojun &dst->sin6_addr, ln, 0);
479 1.54 itojun } else {
480 1.54 itojun next = nd6_free(rt, 0);
481 1.54 itojun }
482 1.2 itojun break;
483 1.2 itojun }
484 1.2 itojun ln = next;
485 1.2 itojun }
486 1.63 itojun
487 1.43 itojun /* expire default router list */
488 1.12 itojun dr = TAILQ_FIRST(&nd_defrouter);
489 1.2 itojun while (dr) {
490 1.2 itojun if (dr->expire && dr->expire < time_second) {
491 1.2 itojun struct nd_defrouter *t;
492 1.12 itojun t = TAILQ_NEXT(dr, dr_entry);
493 1.2 itojun defrtrlist_del(dr);
494 1.2 itojun dr = t;
495 1.31 itojun } else {
496 1.12 itojun dr = TAILQ_NEXT(dr, dr_entry);
497 1.31 itojun }
498 1.2 itojun }
499 1.2 itojun pr = nd_prefix.lh_first;
500 1.2 itojun while (pr) {
501 1.2 itojun struct in6_ifaddr *ia6;
502 1.2 itojun struct in6_addrlifetime *lt6;
503 1.2 itojun
504 1.2 itojun if (IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
505 1.2 itojun ia6 = NULL;
506 1.2 itojun else
507 1.2 itojun ia6 = in6ifa_ifpwithaddr(pr->ndpr_ifp, &pr->ndpr_addr);
508 1.2 itojun
509 1.2 itojun if (ia6) {
510 1.2 itojun /* check address lifetime */
511 1.2 itojun lt6 = &ia6->ia6_lifetime;
512 1.2 itojun if (lt6->ia6t_preferred && lt6->ia6t_preferred < time_second)
513 1.2 itojun ia6->ia6_flags |= IN6_IFF_DEPRECATED;
514 1.2 itojun if (lt6->ia6t_expire && lt6->ia6t_expire < time_second) {
515 1.2 itojun if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
516 1.2 itojun in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr);
517 1.2 itojun /* xxx ND_OPT_PI_FLAG_ONLINK processing */
518 1.2 itojun }
519 1.2 itojun }
520 1.2 itojun
521 1.2 itojun /*
522 1.2 itojun * check prefix lifetime.
523 1.2 itojun * since pltime is just for autoconf, pltime processing for
524 1.2 itojun * prefix is not necessary.
525 1.2 itojun *
526 1.2 itojun * we offset expire time by NDPR_KEEP_EXPIRE, so that we
527 1.2 itojun * can use the old prefix information to validate the
528 1.2 itojun * next prefix information to come. See prelist_update()
529 1.2 itojun * for actual validation.
530 1.2 itojun */
531 1.2 itojun if (pr->ndpr_expire
532 1.2 itojun && pr->ndpr_expire + NDPR_KEEP_EXPIRED < time_second) {
533 1.2 itojun struct nd_prefix *t;
534 1.2 itojun t = pr->ndpr_next;
535 1.2 itojun
536 1.2 itojun /*
537 1.2 itojun * address expiration and prefix expiration are
538 1.2 itojun * separate. NEVER perform in6_ifdel here.
539 1.2 itojun */
540 1.2 itojun
541 1.2 itojun prelist_remove(pr);
542 1.2 itojun pr = t;
543 1.2 itojun } else
544 1.2 itojun pr = pr->ndpr_next;
545 1.2 itojun }
546 1.2 itojun splx(s);
547 1.16 itojun }
548 1.16 itojun
549 1.16 itojun /*
550 1.16 itojun * Nuke neighbor cache/prefix/default router management table, right before
551 1.16 itojun * ifp goes away.
552 1.16 itojun */
553 1.16 itojun void
554 1.16 itojun nd6_purge(ifp)
555 1.16 itojun struct ifnet *ifp;
556 1.16 itojun {
557 1.16 itojun struct llinfo_nd6 *ln, *nln;
558 1.16 itojun struct nd_defrouter *dr, *ndr, drany;
559 1.16 itojun struct nd_prefix *pr, *npr;
560 1.16 itojun
561 1.16 itojun /* Nuke default router list entries toward ifp */
562 1.16 itojun if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
563 1.16 itojun /*
564 1.16 itojun * The first entry of the list may be stored in
565 1.16 itojun * the routing table, so we'll delete it later.
566 1.16 itojun */
567 1.16 itojun for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = ndr) {
568 1.16 itojun ndr = TAILQ_NEXT(dr, dr_entry);
569 1.16 itojun if (dr->ifp == ifp)
570 1.16 itojun defrtrlist_del(dr);
571 1.16 itojun }
572 1.16 itojun dr = TAILQ_FIRST(&nd_defrouter);
573 1.16 itojun if (dr->ifp == ifp)
574 1.16 itojun defrtrlist_del(dr);
575 1.16 itojun }
576 1.16 itojun
577 1.16 itojun /* Nuke prefix list entries toward ifp */
578 1.16 itojun for (pr = nd_prefix.lh_first; pr; pr = npr) {
579 1.16 itojun npr = pr->ndpr_next;
580 1.16 itojun if (pr->ndpr_ifp == ifp) {
581 1.16 itojun if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
582 1.16 itojun in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr);
583 1.16 itojun prelist_remove(pr);
584 1.16 itojun }
585 1.16 itojun }
586 1.16 itojun
587 1.16 itojun /* cancel default outgoing interface setting */
588 1.16 itojun if (nd6_defifindex == ifp->if_index)
589 1.16 itojun nd6_setdefaultiface(0);
590 1.16 itojun
591 1.48 itojun if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */
592 1.48 itojun /* refresh default router list */
593 1.48 itojun bzero(&drany, sizeof(drany));
594 1.48 itojun defrouter_delreq(&drany, 0);
595 1.48 itojun defrouter_select();
596 1.48 itojun }
597 1.16 itojun
598 1.16 itojun /*
599 1.16 itojun * Nuke neighbor cache entries for the ifp.
600 1.16 itojun * Note that rt->rt_ifp may not be the same as ifp,
601 1.16 itojun * due to KAME goto ours hack. See RTM_RESOLVE case in
602 1.18 itojun * nd6_rtrequest(), and ip6_input().
603 1.16 itojun */
604 1.16 itojun ln = llinfo_nd6.ln_next;
605 1.16 itojun while (ln && ln != &llinfo_nd6) {
606 1.16 itojun struct rtentry *rt;
607 1.16 itojun struct sockaddr_dl *sdl;
608 1.16 itojun
609 1.16 itojun nln = ln->ln_next;
610 1.16 itojun rt = ln->ln_rt;
611 1.16 itojun if (rt && rt->rt_gateway &&
612 1.16 itojun rt->rt_gateway->sa_family == AF_LINK) {
613 1.16 itojun sdl = (struct sockaddr_dl *)rt->rt_gateway;
614 1.16 itojun if (sdl->sdl_index == ifp->if_index)
615 1.54 itojun nln = nd6_free(rt, 0);
616 1.16 itojun }
617 1.16 itojun ln = nln;
618 1.16 itojun }
619 1.2 itojun }
620 1.2 itojun
621 1.2 itojun struct rtentry *
622 1.2 itojun nd6_lookup(addr6, create, ifp)
623 1.2 itojun struct in6_addr *addr6;
624 1.2 itojun int create;
625 1.2 itojun struct ifnet *ifp;
626 1.2 itojun {
627 1.2 itojun struct rtentry *rt;
628 1.2 itojun struct sockaddr_in6 sin6;
629 1.2 itojun
630 1.2 itojun bzero(&sin6, sizeof(sin6));
631 1.2 itojun sin6.sin6_len = sizeof(struct sockaddr_in6);
632 1.2 itojun sin6.sin6_family = AF_INET6;
633 1.2 itojun sin6.sin6_addr = *addr6;
634 1.13 itojun rt = rtalloc1((struct sockaddr *)&sin6, create);
635 1.2 itojun if (rt && (rt->rt_flags & RTF_LLINFO) == 0) {
636 1.2 itojun /*
637 1.2 itojun * This is the case for the default route.
638 1.25 itojun * If we want to create a neighbor cache for the address, we
639 1.2 itojun * should free the route for the destination and allocate an
640 1.2 itojun * interface route.
641 1.2 itojun */
642 1.2 itojun if (create) {
643 1.2 itojun RTFREE(rt);
644 1.2 itojun rt = 0;
645 1.2 itojun }
646 1.2 itojun }
647 1.2 itojun if (!rt) {
648 1.2 itojun if (create && ifp) {
649 1.25 itojun int e;
650 1.25 itojun
651 1.2 itojun /*
652 1.2 itojun * If no route is available and create is set,
653 1.2 itojun * we allocate a host route for the destination
654 1.2 itojun * and treat it like an interface route.
655 1.2 itojun * This hack is necessary for a neighbor which can't
656 1.2 itojun * be covered by our own prefix.
657 1.2 itojun */
658 1.2 itojun struct ifaddr *ifa =
659 1.2 itojun ifaof_ifpforaddr((struct sockaddr *)&sin6, ifp);
660 1.2 itojun if (ifa == NULL)
661 1.2 itojun return(NULL);
662 1.2 itojun
663 1.2 itojun /*
664 1.52 itojun * Create a new route. RTF_LLINFO is necessary
665 1.2 itojun * to create a Neighbor Cache entry for the
666 1.2 itojun * destination in nd6_rtrequest which will be
667 1.52 itojun * called in rtrequest via ifa->ifa_rtrequest.
668 1.2 itojun */
669 1.25 itojun if ((e = rtrequest(RTM_ADD, (struct sockaddr *)&sin6,
670 1.25 itojun ifa->ifa_addr,
671 1.25 itojun (struct sockaddr *)&all1_sa,
672 1.25 itojun (ifa->ifa_flags |
673 1.25 itojun RTF_HOST | RTF_LLINFO) &
674 1.25 itojun ~RTF_CLONING,
675 1.54 itojun &rt)) != 0) {
676 1.54 itojun #if 0
677 1.2 itojun log(LOG_ERR,
678 1.2 itojun "nd6_lookup: failed to add route for a "
679 1.25 itojun "neighbor(%s), errno=%d\n",
680 1.25 itojun ip6_sprintf(addr6), e);
681 1.54 itojun #endif
682 1.54 itojun return(NULL);
683 1.54 itojun }
684 1.2 itojun if (rt == NULL)
685 1.2 itojun return(NULL);
686 1.2 itojun if (rt->rt_llinfo) {
687 1.2 itojun struct llinfo_nd6 *ln =
688 1.2 itojun (struct llinfo_nd6 *)rt->rt_llinfo;
689 1.2 itojun ln->ln_state = ND6_LLINFO_NOSTATE;
690 1.2 itojun }
691 1.31 itojun } else
692 1.2 itojun return(NULL);
693 1.2 itojun }
694 1.2 itojun rt->rt_refcnt--;
695 1.12 itojun /*
696 1.12 itojun * Validation for the entry.
697 1.12 itojun * XXX: we can't use rt->rt_ifp to check for the interface, since
698 1.12 itojun * it might be the loopback interface if the entry is for our
699 1.12 itojun * own address on a non-loopback interface. Instead, we should
700 1.12 itojun * use rt->rt_ifa->ifa_ifp, which would specify the REAL interface.
701 1.12 itojun */
702 1.2 itojun if ((rt->rt_flags & RTF_GATEWAY) || (rt->rt_flags & RTF_LLINFO) == 0 ||
703 1.12 itojun rt->rt_gateway->sa_family != AF_LINK ||
704 1.12 itojun (ifp && rt->rt_ifa->ifa_ifp != ifp)) {
705 1.2 itojun if (create) {
706 1.12 itojun log(LOG_DEBUG, "nd6_lookup: failed to lookup %s (if = %s)\n",
707 1.12 itojun ip6_sprintf(addr6), ifp ? if_name(ifp) : "unspec");
708 1.2 itojun }
709 1.2 itojun return(0);
710 1.2 itojun }
711 1.2 itojun return(rt);
712 1.6 itojun }
713 1.6 itojun
714 1.6 itojun /*
715 1.6 itojun * Detect if a given IPv6 address identifies a neighbor on a given link.
716 1.25 itojun * XXX: should take care of the destination of a p2p link?
717 1.6 itojun */
718 1.6 itojun int
719 1.6 itojun nd6_is_addr_neighbor(addr, ifp)
720 1.29 itojun struct sockaddr_in6 *addr;
721 1.6 itojun struct ifnet *ifp;
722 1.6 itojun {
723 1.38 itojun struct ifaddr *ifa;
724 1.6 itojun int i;
725 1.6 itojun
726 1.6 itojun #define IFADDR6(a) ((((struct in6_ifaddr *)(a))->ia_addr).sin6_addr)
727 1.6 itojun #define IFMASK6(a) ((((struct in6_ifaddr *)(a))->ia_prefixmask).sin6_addr)
728 1.6 itojun
729 1.29 itojun /*
730 1.29 itojun * A link-local address is always a neighbor.
731 1.29 itojun * XXX: we should use the sin6_scope_id field rather than the embedded
732 1.29 itojun * interface index.
733 1.52 itojun * XXX: a link does not necessarily specify a single interface.
734 1.29 itojun */
735 1.29 itojun if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr) &&
736 1.29 itojun ntohs(*(u_int16_t *)&addr->sin6_addr.s6_addr[2]) == ifp->if_index)
737 1.6 itojun return(1);
738 1.6 itojun
739 1.6 itojun /*
740 1.6 itojun * If the address matches one of our addresses,
741 1.6 itojun * it should be a neighbor.
742 1.6 itojun */
743 1.6 itojun for (ifa = ifp->if_addrlist.tqh_first;
744 1.6 itojun ifa;
745 1.6 itojun ifa = ifa->ifa_list.tqe_next)
746 1.6 itojun {
747 1.6 itojun if (ifa->ifa_addr->sa_family != AF_INET6)
748 1.6 itojun next: continue;
749 1.6 itojun
750 1.6 itojun for (i = 0; i < 4; i++) {
751 1.29 itojun if ((IFADDR6(ifa).s6_addr32[i] ^
752 1.29 itojun addr->sin6_addr.s6_addr32[i]) &
753 1.6 itojun IFMASK6(ifa).s6_addr32[i])
754 1.6 itojun goto next;
755 1.6 itojun }
756 1.6 itojun return(1);
757 1.6 itojun }
758 1.6 itojun
759 1.6 itojun /*
760 1.6 itojun * Even if the address matches none of our addresses, it might be
761 1.6 itojun * in the neighbor cache.
762 1.6 itojun */
763 1.29 itojun if (nd6_lookup(&addr->sin6_addr, 0, ifp))
764 1.6 itojun return(1);
765 1.6 itojun
766 1.6 itojun return(0);
767 1.6 itojun #undef IFADDR6
768 1.6 itojun #undef IFMASK6
769 1.2 itojun }
770 1.2 itojun
771 1.2 itojun /*
772 1.2 itojun * Free an nd6 llinfo entry.
773 1.54 itojun * Since the function would cause significant changes in the kernel, DO NOT
774 1.54 itojun * make it global, unless you have a strong reason for the change, and are sure
775 1.54 itojun * that the change is safe.
776 1.2 itojun */
777 1.54 itojun static struct llinfo_nd6 *
778 1.54 itojun nd6_free(rt, gc)
779 1.2 itojun struct rtentry *rt;
780 1.54 itojun int gc;
781 1.2 itojun {
782 1.37 itojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo, *next;
783 1.12 itojun struct in6_addr in6 = ((struct sockaddr_in6 *)rt_key(rt))->sin6_addr;
784 1.12 itojun struct nd_defrouter *dr;
785 1.2 itojun
786 1.18 itojun /*
787 1.54 itojun * we used to have pfctlinput(PRC_HOSTDEAD) here.
788 1.54 itojun * even though it is not harmful, it was not really necessary.
789 1.18 itojun */
790 1.18 itojun
791 1.12 itojun if (!ip6_forwarding && ip6_accept_rtadv) { /* XXX: too restrictive? */
792 1.2 itojun int s;
793 1.5 itojun s = splsoftnet();
794 1.12 itojun dr = defrouter_lookup(&((struct sockaddr_in6 *)rt_key(rt))->sin6_addr,
795 1.2 itojun rt->rt_ifp);
796 1.54 itojun
797 1.54 itojun if (dr != NULL && dr->expire &&
798 1.54 itojun ln->ln_state == ND6_LLINFO_STALE && gc) {
799 1.54 itojun /*
800 1.54 itojun * If the reason for the deletion is just garbage
801 1.54 itojun * collection, and the neighbor is an active default
802 1.54 itojun * router, do not delete it. Instead, reset the GC
803 1.54 itojun * timer using the router's lifetime.
804 1.54 itojun * Simply deleting the entry would affect default
805 1.54 itojun * router selection, which is not necessarily a good
806 1.54 itojun * thing, especially when we're using router preference
807 1.54 itojun * values.
808 1.54 itojun * XXX: the check for ln_state would be redundant,
809 1.54 itojun * but we intentionally keep it just in case.
810 1.54 itojun */
811 1.54 itojun ln->ln_expire = dr->expire;
812 1.54 itojun splx(s);
813 1.54 itojun return(ln->ln_next);
814 1.54 itojun }
815 1.54 itojun
816 1.12 itojun if (ln->ln_router || dr) {
817 1.12 itojun /*
818 1.12 itojun * rt6_flush must be called whether or not the neighbor
819 1.12 itojun * is in the Default Router List.
820 1.12 itojun * See a corresponding comment in nd6_na_input().
821 1.12 itojun */
822 1.12 itojun rt6_flush(&in6, rt->rt_ifp);
823 1.12 itojun }
824 1.12 itojun
825 1.12 itojun if (dr) {
826 1.12 itojun /*
827 1.12 itojun * Unreachablity of a router might affect the default
828 1.12 itojun * router selection and on-link detection of advertised
829 1.12 itojun * prefixes.
830 1.12 itojun */
831 1.12 itojun
832 1.2 itojun /*
833 1.12 itojun * Temporarily fake the state to choose a new default
834 1.12 itojun * router and to perform on-link determination of
835 1.54 itojun * prefixes correctly.
836 1.12 itojun * Below the state will be set correctly,
837 1.12 itojun * or the entry itself will be deleted.
838 1.2 itojun */
839 1.12 itojun ln->ln_state = ND6_LLINFO_INCOMPLETE;
840 1.12 itojun
841 1.54 itojun /*
842 1.54 itojun * Since defrouter_select() does not affect the
843 1.54 itojun * on-link determination and MIP6 needs the check
844 1.54 itojun * before the default router selection, we perform
845 1.54 itojun * the check now.
846 1.54 itojun */
847 1.54 itojun pfxlist_onlink_check();
848 1.54 itojun
849 1.12 itojun if (dr == TAILQ_FIRST(&nd_defrouter)) {
850 1.12 itojun /*
851 1.12 itojun * It is used as the current default router,
852 1.12 itojun * so we have to move it to the end of the
853 1.12 itojun * list and choose a new one.
854 1.12 itojun * XXX: it is not very efficient if this is
855 1.12 itojun * the only router.
856 1.12 itojun */
857 1.12 itojun TAILQ_REMOVE(&nd_defrouter, dr, dr_entry);
858 1.12 itojun TAILQ_INSERT_TAIL(&nd_defrouter, dr, dr_entry);
859 1.12 itojun
860 1.12 itojun defrouter_select();
861 1.12 itojun }
862 1.2 itojun }
863 1.2 itojun splx(s);
864 1.2 itojun }
865 1.12 itojun
866 1.37 itojun /*
867 1.37 itojun * Before deleting the entry, remember the next entry as the
868 1.37 itojun * return value. We need this because pfxlist_onlink_check() above
869 1.37 itojun * might have freed other entries (particularly the old next entry) as
870 1.52 itojun * a side effect (XXX).
871 1.37 itojun */
872 1.37 itojun next = ln->ln_next;
873 1.37 itojun
874 1.37 itojun /*
875 1.37 itojun * Detach the route from the routing tree and the list of neighbor
876 1.37 itojun * caches, and disable the route entry not to be used in already
877 1.37 itojun * cached routes.
878 1.37 itojun */
879 1.12 itojun rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0,
880 1.12 itojun rt_mask(rt), 0, (struct rtentry **)0);
881 1.37 itojun
882 1.43 itojun return(next);
883 1.2 itojun }
884 1.2 itojun
885 1.2 itojun /*
886 1.2 itojun * Upper-layer reachability hint for Neighbor Unreachability Detection.
887 1.2 itojun *
888 1.2 itojun * XXX cost-effective metods?
889 1.2 itojun */
890 1.2 itojun void
891 1.31 itojun nd6_nud_hint(rt, dst6, force)
892 1.2 itojun struct rtentry *rt;
893 1.2 itojun struct in6_addr *dst6;
894 1.31 itojun int force;
895 1.2 itojun {
896 1.2 itojun struct llinfo_nd6 *ln;
897 1.12 itojun long time_second = time.tv_sec;
898 1.2 itojun
899 1.2 itojun /*
900 1.2 itojun * If the caller specified "rt", use that. Otherwise, resolve the
901 1.2 itojun * routing table by supplied "dst6".
902 1.2 itojun */
903 1.2 itojun if (!rt) {
904 1.2 itojun if (!dst6)
905 1.2 itojun return;
906 1.2 itojun if (!(rt = nd6_lookup(dst6, 0, NULL)))
907 1.2 itojun return;
908 1.2 itojun }
909 1.2 itojun
910 1.31 itojun if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
911 1.31 itojun (rt->rt_flags & RTF_LLINFO) == 0 ||
912 1.31 itojun !rt->rt_llinfo || !rt->rt_gateway ||
913 1.31 itojun rt->rt_gateway->sa_family != AF_LINK) {
914 1.2 itojun /* This is not a host route. */
915 1.2 itojun return;
916 1.2 itojun }
917 1.2 itojun
918 1.2 itojun ln = (struct llinfo_nd6 *)rt->rt_llinfo;
919 1.22 itojun if (ln->ln_state < ND6_LLINFO_REACHABLE)
920 1.2 itojun return;
921 1.2 itojun
922 1.31 itojun /*
923 1.31 itojun * if we get upper-layer reachability confirmation many times,
924 1.31 itojun * it is possible we have false information.
925 1.31 itojun */
926 1.31 itojun if (!force) {
927 1.31 itojun ln->ln_byhint++;
928 1.31 itojun if (ln->ln_byhint > nd6_maxnudhint)
929 1.31 itojun return;
930 1.31 itojun }
931 1.31 itojun
932 1.2 itojun ln->ln_state = ND6_LLINFO_REACHABLE;
933 1.2 itojun if (ln->ln_expire)
934 1.58 itojun ln->ln_expire = time_second + ND_IFINFO(rt->rt_ifp)->reachable;
935 1.2 itojun }
936 1.2 itojun
937 1.2 itojun void
938 1.34 itojun nd6_rtrequest(req, rt, info)
939 1.2 itojun int req;
940 1.2 itojun struct rtentry *rt;
941 1.34 itojun struct rt_addrinfo *info; /* xxx unused */
942 1.2 itojun {
943 1.2 itojun struct sockaddr *gate = rt->rt_gateway;
944 1.2 itojun struct llinfo_nd6 *ln = (struct llinfo_nd6 *)rt->rt_llinfo;
945 1.2 itojun static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
946 1.2 itojun struct ifnet *ifp = rt->rt_ifp;
947 1.2 itojun struct ifaddr *ifa;
948 1.12 itojun long time_second = time.tv_sec;
949 1.2 itojun
950 1.56 itojun if ((rt->rt_flags & RTF_GATEWAY))
951 1.2 itojun return;
952 1.2 itojun
953 1.54 itojun if (nd6_need_cache(ifp) == 0 && (rt->rt_flags & RTF_HOST) == 0) {
954 1.54 itojun /*
955 1.54 itojun * This is probably an interface direct route for a link
956 1.54 itojun * which does not need neighbor caches (e.g. fe80::%lo0/64).
957 1.54 itojun * We do not need special treatment below for such a route.
958 1.54 itojun * Moreover, the RTF_LLINFO flag which would be set below
959 1.54 itojun * would annoy the ndp(8) command.
960 1.54 itojun */
961 1.54 itojun return;
962 1.54 itojun }
963 1.54 itojun
964 1.2 itojun switch (req) {
965 1.2 itojun case RTM_ADD:
966 1.2 itojun /*
967 1.2 itojun * There is no backward compatibility :)
968 1.2 itojun *
969 1.2 itojun * if ((rt->rt_flags & RTF_HOST) == 0 &&
970 1.2 itojun * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
971 1.2 itojun * rt->rt_flags |= RTF_CLONING;
972 1.2 itojun */
973 1.18 itojun if (rt->rt_flags & (RTF_CLONING | RTF_LLINFO)) {
974 1.2 itojun /*
975 1.2 itojun * Case 1: This route should come from
976 1.52 itojun * a route to interface. RTF_LLINFO flag is set
977 1.2 itojun * for a host route whose destination should be
978 1.2 itojun * treated as on-link.
979 1.2 itojun */
980 1.2 itojun rt_setgate(rt, rt_key(rt),
981 1.2 itojun (struct sockaddr *)&null_sdl);
982 1.2 itojun gate = rt->rt_gateway;
983 1.2 itojun SDL(gate)->sdl_type = ifp->if_type;
984 1.2 itojun SDL(gate)->sdl_index = ifp->if_index;
985 1.2 itojun if (ln)
986 1.2 itojun ln->ln_expire = time_second;
987 1.2 itojun #if 1
988 1.2 itojun if (ln && ln->ln_expire == 0) {
989 1.43 itojun /* kludge for desktops */
990 1.2 itojun #if 0
991 1.54 itojun printf("nd6_rtequest: time.tv_sec is zero; "
992 1.2 itojun "treat it as 1\n");
993 1.2 itojun #endif
994 1.2 itojun ln->ln_expire = 1;
995 1.2 itojun }
996 1.2 itojun #endif
997 1.56 itojun if ((rt->rt_flags & RTF_CLONING))
998 1.2 itojun break;
999 1.2 itojun }
1000 1.18 itojun /*
1001 1.18 itojun * In IPv4 code, we try to annonuce new RTF_ANNOUNCE entry here.
1002 1.18 itojun * We don't do that here since llinfo is not ready yet.
1003 1.18 itojun *
1004 1.18 itojun * There are also couple of other things to be discussed:
1005 1.18 itojun * - unsolicited NA code needs improvement beforehand
1006 1.18 itojun * - RFC2461 says we MAY send multicast unsolicited NA
1007 1.18 itojun * (7.2.6 paragraph 4), however, it also says that we
1008 1.18 itojun * SHOULD provide a mechanism to prevent multicast NA storm.
1009 1.18 itojun * we don't have anything like it right now.
1010 1.38 itojun * note that the mechanism needs a mutual agreement
1011 1.18 itojun * between proxies, which means that we need to implement
1012 1.38 itojun * a new protocol, or a new kludge.
1013 1.38 itojun * - from RFC2461 6.2.4, host MUST NOT send an unsolicited NA.
1014 1.18 itojun * we need to check ip6forwarding before sending it.
1015 1.18 itojun * (or should we allow proxy ND configuration only for
1016 1.18 itojun * routers? there's no mention about proxy ND from hosts)
1017 1.18 itojun */
1018 1.18 itojun #if 0
1019 1.18 itojun /* XXX it does not work */
1020 1.2 itojun if (rt->rt_flags & RTF_ANNOUNCE)
1021 1.2 itojun nd6_na_output(ifp,
1022 1.18 itojun &SIN6(rt_key(rt))->sin6_addr,
1023 1.18 itojun &SIN6(rt_key(rt))->sin6_addr,
1024 1.18 itojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0,
1025 1.18 itojun 1, NULL);
1026 1.18 itojun #endif
1027 1.2 itojun /* FALLTHROUGH */
1028 1.2 itojun case RTM_RESOLVE:
1029 1.26 itojun if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
1030 1.26 itojun /*
1031 1.26 itojun * Address resolution isn't necessary for a point to
1032 1.26 itojun * point link, so we can skip this test for a p2p link.
1033 1.26 itojun */
1034 1.26 itojun if (gate->sa_family != AF_LINK ||
1035 1.26 itojun gate->sa_len < sizeof(null_sdl)) {
1036 1.26 itojun log(LOG_DEBUG,
1037 1.36 itojun "nd6_rtrequest: bad gateway value: %s\n",
1038 1.36 itojun if_name(ifp));
1039 1.26 itojun break;
1040 1.26 itojun }
1041 1.26 itojun SDL(gate)->sdl_type = ifp->if_type;
1042 1.26 itojun SDL(gate)->sdl_index = ifp->if_index;
1043 1.2 itojun }
1044 1.26 itojun if (ln != NULL)
1045 1.2 itojun break; /* This happens on a route change */
1046 1.2 itojun /*
1047 1.2 itojun * Case 2: This route may come from cloning, or a manual route
1048 1.2 itojun * add with a LL address.
1049 1.2 itojun */
1050 1.2 itojun R_Malloc(ln, struct llinfo_nd6 *, sizeof(*ln));
1051 1.2 itojun rt->rt_llinfo = (caddr_t)ln;
1052 1.2 itojun if (!ln) {
1053 1.2 itojun log(LOG_DEBUG, "nd6_rtrequest: malloc failed\n");
1054 1.2 itojun break;
1055 1.2 itojun }
1056 1.2 itojun nd6_inuse++;
1057 1.2 itojun nd6_allocated++;
1058 1.2 itojun Bzero(ln, sizeof(*ln));
1059 1.2 itojun ln->ln_rt = rt;
1060 1.2 itojun /* this is required for "ndp" command. - shin */
1061 1.2 itojun if (req == RTM_ADD) {
1062 1.2 itojun /*
1063 1.2 itojun * gate should have some valid AF_LINK entry,
1064 1.2 itojun * and ln->ln_expire should have some lifetime
1065 1.2 itojun * which is specified by ndp command.
1066 1.2 itojun */
1067 1.2 itojun ln->ln_state = ND6_LLINFO_REACHABLE;
1068 1.31 itojun ln->ln_byhint = 0;
1069 1.2 itojun } else {
1070 1.25 itojun /*
1071 1.2 itojun * When req == RTM_RESOLVE, rt is created and
1072 1.2 itojun * initialized in rtrequest(), so rt_expire is 0.
1073 1.2 itojun */
1074 1.12 itojun ln->ln_state = ND6_LLINFO_NOSTATE;
1075 1.2 itojun ln->ln_expire = time_second;
1076 1.2 itojun }
1077 1.2 itojun rt->rt_flags |= RTF_LLINFO;
1078 1.3 itojun ln->ln_next = llinfo_nd6.ln_next;
1079 1.3 itojun llinfo_nd6.ln_next = ln;
1080 1.3 itojun ln->ln_prev = &llinfo_nd6;
1081 1.3 itojun ln->ln_next->ln_prev = ln;
1082 1.2 itojun
1083 1.2 itojun /*
1084 1.2 itojun * check if rt_key(rt) is one of my address assigned
1085 1.2 itojun * to the interface.
1086 1.2 itojun */
1087 1.2 itojun ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp,
1088 1.2 itojun &SIN6(rt_key(rt))->sin6_addr);
1089 1.2 itojun if (ifa) {
1090 1.2 itojun caddr_t macp = nd6_ifptomac(ifp);
1091 1.2 itojun ln->ln_expire = 0;
1092 1.2 itojun ln->ln_state = ND6_LLINFO_REACHABLE;
1093 1.31 itojun ln->ln_byhint = 0;
1094 1.2 itojun if (macp) {
1095 1.2 itojun Bcopy(macp, LLADDR(SDL(gate)), ifp->if_addrlen);
1096 1.2 itojun SDL(gate)->sdl_alen = ifp->if_addrlen;
1097 1.2 itojun }
1098 1.2 itojun if (nd6_useloopback) {
1099 1.54 itojun rt->rt_ifp = &loif[0]; /* XXX */
1100 1.2 itojun /*
1101 1.2 itojun * Make sure rt_ifa be equal to the ifaddr
1102 1.2 itojun * corresponding to the address.
1103 1.2 itojun * We need this because when we refer
1104 1.2 itojun * rt_ifa->ia6_flags in ip6_input, we assume
1105 1.2 itojun * that the rt_ifa points to the address instead
1106 1.2 itojun * of the loopback address.
1107 1.2 itojun */
1108 1.2 itojun if (ifa != rt->rt_ifa) {
1109 1.14 thorpej IFAFREE(rt->rt_ifa);
1110 1.14 thorpej IFAREF(ifa);
1111 1.2 itojun rt->rt_ifa = ifa;
1112 1.2 itojun }
1113 1.2 itojun }
1114 1.18 itojun } else if (rt->rt_flags & RTF_ANNOUNCE) {
1115 1.18 itojun ln->ln_expire = 0;
1116 1.18 itojun ln->ln_state = ND6_LLINFO_REACHABLE;
1117 1.31 itojun ln->ln_byhint = 0;
1118 1.18 itojun
1119 1.18 itojun /* join solicited node multicast for proxy ND */
1120 1.18 itojun if (ifp->if_flags & IFF_MULTICAST) {
1121 1.18 itojun struct in6_addr llsol;
1122 1.18 itojun int error;
1123 1.18 itojun
1124 1.18 itojun llsol = SIN6(rt_key(rt))->sin6_addr;
1125 1.18 itojun llsol.s6_addr16[0] = htons(0xff02);
1126 1.18 itojun llsol.s6_addr16[1] = htons(ifp->if_index);
1127 1.18 itojun llsol.s6_addr32[1] = 0;
1128 1.18 itojun llsol.s6_addr32[2] = htonl(1);
1129 1.18 itojun llsol.s6_addr8[12] = 0xff;
1130 1.18 itojun
1131 1.46 itojun if (!in6_addmulti(&llsol, ifp, &error)) {
1132 1.54 itojun nd6log((LOG_ERR, "%s: failed to join "
1133 1.54 itojun "%s (errno=%d)\n", if_name(ifp),
1134 1.54 itojun ip6_sprintf(&llsol), error));
1135 1.46 itojun }
1136 1.18 itojun }
1137 1.2 itojun }
1138 1.2 itojun break;
1139 1.2 itojun
1140 1.2 itojun case RTM_DELETE:
1141 1.2 itojun if (!ln)
1142 1.2 itojun break;
1143 1.18 itojun /* leave from solicited node multicast for proxy ND */
1144 1.18 itojun if ((rt->rt_flags & RTF_ANNOUNCE) != 0 &&
1145 1.18 itojun (ifp->if_flags & IFF_MULTICAST) != 0) {
1146 1.18 itojun struct in6_addr llsol;
1147 1.18 itojun struct in6_multi *in6m;
1148 1.18 itojun
1149 1.18 itojun llsol = SIN6(rt_key(rt))->sin6_addr;
1150 1.18 itojun llsol.s6_addr16[0] = htons(0xff02);
1151 1.18 itojun llsol.s6_addr16[1] = htons(ifp->if_index);
1152 1.18 itojun llsol.s6_addr32[1] = 0;
1153 1.18 itojun llsol.s6_addr32[2] = htonl(1);
1154 1.18 itojun llsol.s6_addr8[12] = 0xff;
1155 1.18 itojun
1156 1.18 itojun IN6_LOOKUP_MULTI(llsol, ifp, in6m);
1157 1.18 itojun if (in6m)
1158 1.18 itojun in6_delmulti(in6m);
1159 1.18 itojun }
1160 1.2 itojun nd6_inuse--;
1161 1.3 itojun ln->ln_next->ln_prev = ln->ln_prev;
1162 1.3 itojun ln->ln_prev->ln_next = ln->ln_next;
1163 1.3 itojun ln->ln_prev = NULL;
1164 1.2 itojun rt->rt_llinfo = 0;
1165 1.2 itojun rt->rt_flags &= ~RTF_LLINFO;
1166 1.2 itojun if (ln->ln_hold)
1167 1.2 itojun m_freem(ln->ln_hold);
1168 1.2 itojun Free((caddr_t)ln);
1169 1.2 itojun }
1170 1.2 itojun }
1171 1.2 itojun
1172 1.2 itojun void
1173 1.34 itojun nd6_p2p_rtrequest(req, rt, info)
1174 1.2 itojun int req;
1175 1.2 itojun struct rtentry *rt;
1176 1.34 itojun struct rt_addrinfo *info; /* xxx unused */
1177 1.2 itojun {
1178 1.2 itojun struct sockaddr *gate = rt->rt_gateway;
1179 1.2 itojun static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
1180 1.2 itojun struct ifnet *ifp = rt->rt_ifp;
1181 1.2 itojun struct ifaddr *ifa;
1182 1.2 itojun
1183 1.2 itojun if (rt->rt_flags & RTF_GATEWAY)
1184 1.2 itojun return;
1185 1.2 itojun
1186 1.2 itojun switch (req) {
1187 1.2 itojun case RTM_ADD:
1188 1.2 itojun /*
1189 1.2 itojun * There is no backward compatibility :)
1190 1.2 itojun *
1191 1.2 itojun * if ((rt->rt_flags & RTF_HOST) == 0 &&
1192 1.2 itojun * SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff)
1193 1.2 itojun * rt->rt_flags |= RTF_CLONING;
1194 1.2 itojun */
1195 1.2 itojun if (rt->rt_flags & RTF_CLONING) {
1196 1.2 itojun /*
1197 1.2 itojun * Case 1: This route should come from
1198 1.2 itojun * a route to interface.
1199 1.2 itojun */
1200 1.2 itojun rt_setgate(rt, rt_key(rt),
1201 1.2 itojun (struct sockaddr *)&null_sdl);
1202 1.2 itojun gate = rt->rt_gateway;
1203 1.2 itojun SDL(gate)->sdl_type = ifp->if_type;
1204 1.2 itojun SDL(gate)->sdl_index = ifp->if_index;
1205 1.2 itojun break;
1206 1.2 itojun }
1207 1.12 itojun /* Announce a new entry if requested. */
1208 1.2 itojun if (rt->rt_flags & RTF_ANNOUNCE)
1209 1.2 itojun nd6_na_output(ifp,
1210 1.2 itojun &SIN6(rt_key(rt))->sin6_addr,
1211 1.2 itojun &SIN6(rt_key(rt))->sin6_addr,
1212 1.2 itojun ip6_forwarding ? ND_NA_FLAG_ROUTER : 0,
1213 1.18 itojun 1, NULL);
1214 1.2 itojun /* FALLTHROUGH */
1215 1.2 itojun case RTM_RESOLVE:
1216 1.2 itojun /*
1217 1.2 itojun * check if rt_key(rt) is one of my address assigned
1218 1.2 itojun * to the interface.
1219 1.2 itojun */
1220 1.2 itojun ifa = (struct ifaddr *)in6ifa_ifpwithaddr(rt->rt_ifp,
1221 1.2 itojun &SIN6(rt_key(rt))->sin6_addr);
1222 1.2 itojun if (ifa) {
1223 1.2 itojun if (nd6_useloopback) {
1224 1.12 itojun rt->rt_ifp = &loif[0]; /*XXX*/
1225 1.2 itojun }
1226 1.2 itojun }
1227 1.2 itojun break;
1228 1.2 itojun }
1229 1.2 itojun }
1230 1.2 itojun
1231 1.2 itojun int
1232 1.2 itojun nd6_ioctl(cmd, data, ifp)
1233 1.2 itojun u_long cmd;
1234 1.2 itojun caddr_t data;
1235 1.2 itojun struct ifnet *ifp;
1236 1.2 itojun {
1237 1.2 itojun struct in6_drlist *drl = (struct in6_drlist *)data;
1238 1.2 itojun struct in6_prlist *prl = (struct in6_prlist *)data;
1239 1.2 itojun struct in6_ndireq *ndi = (struct in6_ndireq *)data;
1240 1.2 itojun struct in6_nbrinfo *nbi = (struct in6_nbrinfo *)data;
1241 1.12 itojun struct in6_ndifreq *ndif = (struct in6_ndifreq *)data;
1242 1.2 itojun struct nd_defrouter *dr, any;
1243 1.2 itojun struct nd_prefix *pr;
1244 1.2 itojun struct rtentry *rt;
1245 1.2 itojun int i = 0, error = 0;
1246 1.2 itojun int s;
1247 1.2 itojun
1248 1.2 itojun switch (cmd) {
1249 1.2 itojun case SIOCGDRLST_IN6:
1250 1.2 itojun bzero(drl, sizeof(*drl));
1251 1.5 itojun s = splsoftnet();
1252 1.12 itojun dr = TAILQ_FIRST(&nd_defrouter);
1253 1.2 itojun while (dr && i < DRLSTSIZ) {
1254 1.2 itojun drl->defrouter[i].rtaddr = dr->rtaddr;
1255 1.2 itojun if (IN6_IS_ADDR_LINKLOCAL(&drl->defrouter[i].rtaddr)) {
1256 1.2 itojun /* XXX: need to this hack for KAME stack */
1257 1.2 itojun drl->defrouter[i].rtaddr.s6_addr16[1] = 0;
1258 1.31 itojun } else
1259 1.2 itojun log(LOG_ERR,
1260 1.2 itojun "default router list contains a "
1261 1.2 itojun "non-linklocal address(%s)\n",
1262 1.2 itojun ip6_sprintf(&drl->defrouter[i].rtaddr));
1263 1.2 itojun
1264 1.2 itojun drl->defrouter[i].flags = dr->flags;
1265 1.2 itojun drl->defrouter[i].rtlifetime = dr->rtlifetime;
1266 1.2 itojun drl->defrouter[i].expire = dr->expire;
1267 1.2 itojun drl->defrouter[i].if_index = dr->ifp->if_index;
1268 1.2 itojun i++;
1269 1.12 itojun dr = TAILQ_NEXT(dr, dr_entry);
1270 1.2 itojun }
1271 1.2 itojun splx(s);
1272 1.2 itojun break;
1273 1.2 itojun case SIOCGPRLST_IN6:
1274 1.18 itojun /*
1275 1.18 itojun * XXX meaning of fields, especialy "raflags", is very
1276 1.18 itojun * differnet between RA prefix list and RR/static prefix list.
1277 1.18 itojun * how about separating ioctls into two?
1278 1.18 itojun */
1279 1.2 itojun bzero(prl, sizeof(*prl));
1280 1.5 itojun s = splsoftnet();
1281 1.2 itojun pr = nd_prefix.lh_first;
1282 1.2 itojun while (pr && i < PRLSTSIZ) {
1283 1.2 itojun struct nd_pfxrouter *pfr;
1284 1.2 itojun int j;
1285 1.2 itojun
1286 1.2 itojun prl->prefix[i].prefix = pr->ndpr_prefix.sin6_addr;
1287 1.2 itojun prl->prefix[i].raflags = pr->ndpr_raf;
1288 1.2 itojun prl->prefix[i].prefixlen = pr->ndpr_plen;
1289 1.2 itojun prl->prefix[i].vltime = pr->ndpr_vltime;
1290 1.2 itojun prl->prefix[i].pltime = pr->ndpr_pltime;
1291 1.2 itojun prl->prefix[i].if_index = pr->ndpr_ifp->if_index;
1292 1.2 itojun prl->prefix[i].expire = pr->ndpr_expire;
1293 1.2 itojun
1294 1.2 itojun pfr = pr->ndpr_advrtrs.lh_first;
1295 1.2 itojun j = 0;
1296 1.43 itojun while (pfr) {
1297 1.2 itojun if (j < DRLSTSIZ) {
1298 1.2 itojun #define RTRADDR prl->prefix[i].advrtr[j]
1299 1.2 itojun RTRADDR = pfr->router->rtaddr;
1300 1.2 itojun if (IN6_IS_ADDR_LINKLOCAL(&RTRADDR)) {
1301 1.2 itojun /* XXX: hack for KAME */
1302 1.2 itojun RTRADDR.s6_addr16[1] = 0;
1303 1.31 itojun } else
1304 1.2 itojun log(LOG_ERR,
1305 1.2 itojun "a router(%s) advertises "
1306 1.2 itojun "a prefix with "
1307 1.2 itojun "non-link local address\n",
1308 1.2 itojun ip6_sprintf(&RTRADDR));
1309 1.2 itojun #undef RTRADDR
1310 1.2 itojun }
1311 1.2 itojun j++;
1312 1.2 itojun pfr = pfr->pfr_next;
1313 1.2 itojun }
1314 1.2 itojun prl->prefix[i].advrtrs = j;
1315 1.18 itojun prl->prefix[i].origin = PR_ORIG_RA;
1316 1.2 itojun
1317 1.2 itojun i++;
1318 1.2 itojun pr = pr->ndpr_next;
1319 1.2 itojun }
1320 1.12 itojun {
1321 1.12 itojun struct rr_prefix *rpp;
1322 1.12 itojun
1323 1.12 itojun for (rpp = LIST_FIRST(&rr_prefix); rpp;
1324 1.12 itojun rpp = LIST_NEXT(rpp, rp_entry)) {
1325 1.12 itojun if (i >= PRLSTSIZ)
1326 1.12 itojun break;
1327 1.12 itojun prl->prefix[i].prefix = rpp->rp_prefix.sin6_addr;
1328 1.12 itojun prl->prefix[i].raflags = rpp->rp_raf;
1329 1.12 itojun prl->prefix[i].prefixlen = rpp->rp_plen;
1330 1.12 itojun prl->prefix[i].vltime = rpp->rp_vltime;
1331 1.12 itojun prl->prefix[i].pltime = rpp->rp_pltime;
1332 1.12 itojun prl->prefix[i].if_index = rpp->rp_ifp->if_index;
1333 1.12 itojun prl->prefix[i].expire = rpp->rp_expire;
1334 1.12 itojun prl->prefix[i].advrtrs = 0;
1335 1.18 itojun prl->prefix[i].origin = rpp->rp_origin;
1336 1.12 itojun i++;
1337 1.12 itojun }
1338 1.12 itojun }
1339 1.18 itojun splx(s);
1340 1.12 itojun
1341 1.2 itojun break;
1342 1.58 itojun case OSIOCGIFINFO_IN6:
1343 1.58 itojun /* XXX: old ndp(8) assumes a positive value for linkmtu. */
1344 1.60 itojun bzero(&ndi->ndi, sizeof(ndi->ndi));
1345 1.58 itojun ndi->ndi.linkmtu = IN6_LINKMTU(ifp);
1346 1.58 itojun ndi->ndi.maxmtu = ND_IFINFO(ifp)->maxmtu;
1347 1.58 itojun ndi->ndi.basereachable = ND_IFINFO(ifp)->basereachable;
1348 1.58 itojun ndi->ndi.reachable = ND_IFINFO(ifp)->reachable;
1349 1.58 itojun ndi->ndi.retrans = ND_IFINFO(ifp)->retrans;
1350 1.58 itojun ndi->ndi.flags = ND_IFINFO(ifp)->flags;
1351 1.58 itojun ndi->ndi.recalctm = ND_IFINFO(ifp)->recalctm;
1352 1.58 itojun ndi->ndi.chlim = ND_IFINFO(ifp)->chlim;
1353 1.58 itojun break;
1354 1.2 itojun case SIOCGIFINFO_IN6:
1355 1.58 itojun ndi->ndi = *ND_IFINFO(ifp);
1356 1.2 itojun break;
1357 1.26 itojun case SIOCSIFINFO_FLAGS:
1358 1.58 itojun ND_IFINFO(ifp)->flags = ndi->ndi.flags;
1359 1.26 itojun break;
1360 1.12 itojun case SIOCSNDFLUSH_IN6: /* XXX: the ioctl name is confusing... */
1361 1.2 itojun /* flush default router list */
1362 1.2 itojun /*
1363 1.2 itojun * xxx sumikawa: should not delete route if default
1364 1.2 itojun * route equals to the top of default router list
1365 1.2 itojun */
1366 1.2 itojun bzero(&any, sizeof(any));
1367 1.2 itojun defrouter_delreq(&any, 0);
1368 1.12 itojun defrouter_select();
1369 1.2 itojun /* xxx sumikawa: flush prefix list */
1370 1.2 itojun break;
1371 1.2 itojun case SIOCSPFXFLUSH_IN6:
1372 1.2 itojun {
1373 1.2 itojun /* flush all the prefix advertised by routers */
1374 1.2 itojun struct nd_prefix *pr, *next;
1375 1.2 itojun
1376 1.5 itojun s = splsoftnet();
1377 1.2 itojun for (pr = nd_prefix.lh_first; pr; pr = next) {
1378 1.2 itojun next = pr->ndpr_next;
1379 1.2 itojun if (!IN6_IS_ADDR_UNSPECIFIED(&pr->ndpr_addr))
1380 1.2 itojun in6_ifdel(pr->ndpr_ifp, &pr->ndpr_addr);
1381 1.2 itojun prelist_remove(pr);
1382 1.2 itojun }
1383 1.2 itojun splx(s);
1384 1.2 itojun break;
1385 1.2 itojun }
1386 1.2 itojun case SIOCSRTRFLUSH_IN6:
1387 1.2 itojun {
1388 1.2 itojun /* flush all the default routers */
1389 1.2 itojun struct nd_defrouter *dr, *next;
1390 1.2 itojun
1391 1.5 itojun s = splsoftnet();
1392 1.12 itojun if ((dr = TAILQ_FIRST(&nd_defrouter)) != NULL) {
1393 1.2 itojun /*
1394 1.2 itojun * The first entry of the list may be stored in
1395 1.2 itojun * the routing table, so we'll delete it later.
1396 1.2 itojun */
1397 1.12 itojun for (dr = TAILQ_NEXT(dr, dr_entry); dr; dr = next) {
1398 1.12 itojun next = TAILQ_NEXT(dr, dr_entry);
1399 1.2 itojun defrtrlist_del(dr);
1400 1.2 itojun }
1401 1.12 itojun defrtrlist_del(TAILQ_FIRST(&nd_defrouter));
1402 1.2 itojun }
1403 1.2 itojun splx(s);
1404 1.2 itojun break;
1405 1.2 itojun }
1406 1.2 itojun case SIOCGNBRINFO_IN6:
1407 1.2 itojun {
1408 1.12 itojun struct llinfo_nd6 *ln;
1409 1.12 itojun struct in6_addr nb_addr = nbi->addr; /* make local for safety */
1410 1.12 itojun
1411 1.12 itojun /*
1412 1.12 itojun * XXX: KAME specific hack for scoped addresses
1413 1.12 itojun * XXXX: for other scopes than link-local?
1414 1.12 itojun */
1415 1.12 itojun if (IN6_IS_ADDR_LINKLOCAL(&nbi->addr) ||
1416 1.12 itojun IN6_IS_ADDR_MC_LINKLOCAL(&nbi->addr)) {
1417 1.12 itojun u_int16_t *idp = (u_int16_t *)&nb_addr.s6_addr[2];
1418 1.12 itojun
1419 1.12 itojun if (*idp == 0)
1420 1.12 itojun *idp = htons(ifp->if_index);
1421 1.12 itojun }
1422 1.2 itojun
1423 1.12 itojun s = splsoftnet();
1424 1.12 itojun if ((rt = nd6_lookup(&nb_addr, 0, ifp)) == NULL) {
1425 1.12 itojun error = EINVAL;
1426 1.12 itojun splx(s);
1427 1.12 itojun break;
1428 1.12 itojun }
1429 1.12 itojun ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1430 1.12 itojun nbi->state = ln->ln_state;
1431 1.12 itojun nbi->asked = ln->ln_asked;
1432 1.12 itojun nbi->isrouter = ln->ln_router;
1433 1.12 itojun nbi->expire = ln->ln_expire;
1434 1.12 itojun splx(s);
1435 1.63 itojun
1436 1.12 itojun break;
1437 1.2 itojun }
1438 1.12 itojun case SIOCGDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1439 1.12 itojun ndif->ifindex = nd6_defifindex;
1440 1.12 itojun break;
1441 1.12 itojun case SIOCSDEFIFACE_IN6: /* XXX: should be implemented as a sysctl? */
1442 1.12 itojun return(nd6_setdefaultiface(ndif->ifindex));
1443 1.12 itojun break;
1444 1.2 itojun }
1445 1.2 itojun return(error);
1446 1.2 itojun }
1447 1.2 itojun
1448 1.2 itojun /*
1449 1.2 itojun * Create neighbor cache entry and cache link-layer address,
1450 1.52 itojun * on reception of inbound ND6 packets. (RS/RA/NS/redirect)
1451 1.2 itojun */
1452 1.2 itojun struct rtentry *
1453 1.8 itojun nd6_cache_lladdr(ifp, from, lladdr, lladdrlen, type, code)
1454 1.2 itojun struct ifnet *ifp;
1455 1.2 itojun struct in6_addr *from;
1456 1.2 itojun char *lladdr;
1457 1.2 itojun int lladdrlen;
1458 1.2 itojun int type; /* ICMP6 type */
1459 1.8 itojun int code; /* type dependent information */
1460 1.2 itojun {
1461 1.2 itojun struct rtentry *rt = NULL;
1462 1.2 itojun struct llinfo_nd6 *ln = NULL;
1463 1.2 itojun int is_newentry;
1464 1.2 itojun struct sockaddr_dl *sdl = NULL;
1465 1.2 itojun int do_update;
1466 1.2 itojun int olladdr;
1467 1.2 itojun int llchange;
1468 1.2 itojun int newstate = 0;
1469 1.12 itojun long time_second = time.tv_sec;
1470 1.2 itojun
1471 1.2 itojun if (!ifp)
1472 1.2 itojun panic("ifp == NULL in nd6_cache_lladdr");
1473 1.2 itojun if (!from)
1474 1.2 itojun panic("from == NULL in nd6_cache_lladdr");
1475 1.2 itojun
1476 1.2 itojun /* nothing must be updated for unspecified address */
1477 1.2 itojun if (IN6_IS_ADDR_UNSPECIFIED(from))
1478 1.2 itojun return NULL;
1479 1.2 itojun
1480 1.2 itojun /*
1481 1.2 itojun * Validation about ifp->if_addrlen and lladdrlen must be done in
1482 1.2 itojun * the caller.
1483 1.2 itojun *
1484 1.2 itojun * XXX If the link does not have link-layer adderss, what should
1485 1.2 itojun * we do? (ifp->if_addrlen == 0)
1486 1.2 itojun * Spec says nothing in sections for RA, RS and NA. There's small
1487 1.2 itojun * description on it in NS section (RFC 2461 7.2.3).
1488 1.2 itojun */
1489 1.2 itojun
1490 1.2 itojun rt = nd6_lookup(from, 0, ifp);
1491 1.2 itojun if (!rt) {
1492 1.2 itojun #if 0
1493 1.2 itojun /* nothing must be done if there's no lladdr */
1494 1.2 itojun if (!lladdr || !lladdrlen)
1495 1.2 itojun return NULL;
1496 1.2 itojun #endif
1497 1.2 itojun
1498 1.2 itojun rt = nd6_lookup(from, 1, ifp);
1499 1.2 itojun is_newentry = 1;
1500 1.43 itojun } else {
1501 1.43 itojun /* do nothing if static ndp is set */
1502 1.43 itojun if (rt->rt_flags & RTF_STATIC)
1503 1.43 itojun return NULL;
1504 1.2 itojun is_newentry = 0;
1505 1.43 itojun }
1506 1.2 itojun
1507 1.2 itojun if (!rt)
1508 1.2 itojun return NULL;
1509 1.2 itojun if ((rt->rt_flags & (RTF_GATEWAY | RTF_LLINFO)) != RTF_LLINFO) {
1510 1.2 itojun fail:
1511 1.54 itojun (void)nd6_free(rt, 0);
1512 1.2 itojun return NULL;
1513 1.2 itojun }
1514 1.2 itojun ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1515 1.2 itojun if (!ln)
1516 1.2 itojun goto fail;
1517 1.2 itojun if (!rt->rt_gateway)
1518 1.2 itojun goto fail;
1519 1.2 itojun if (rt->rt_gateway->sa_family != AF_LINK)
1520 1.2 itojun goto fail;
1521 1.2 itojun sdl = SDL(rt->rt_gateway);
1522 1.2 itojun
1523 1.2 itojun olladdr = (sdl->sdl_alen) ? 1 : 0;
1524 1.2 itojun if (olladdr && lladdr) {
1525 1.2 itojun if (bcmp(lladdr, LLADDR(sdl), ifp->if_addrlen))
1526 1.2 itojun llchange = 1;
1527 1.2 itojun else
1528 1.2 itojun llchange = 0;
1529 1.2 itojun } else
1530 1.2 itojun llchange = 0;
1531 1.2 itojun
1532 1.2 itojun /*
1533 1.2 itojun * newentry olladdr lladdr llchange (*=record)
1534 1.2 itojun * 0 n n -- (1)
1535 1.2 itojun * 0 y n -- (2)
1536 1.2 itojun * 0 n y -- (3) * STALE
1537 1.2 itojun * 0 y y n (4) *
1538 1.2 itojun * 0 y y y (5) * STALE
1539 1.2 itojun * 1 -- n -- (6) NOSTATE(= PASSIVE)
1540 1.2 itojun * 1 -- y -- (7) * STALE
1541 1.2 itojun */
1542 1.2 itojun
1543 1.52 itojun if (lladdr) { /* (3-5) and (7) */
1544 1.2 itojun /*
1545 1.2 itojun * Record source link-layer address
1546 1.2 itojun * XXX is it dependent to ifp->if_type?
1547 1.2 itojun */
1548 1.2 itojun sdl->sdl_alen = ifp->if_addrlen;
1549 1.2 itojun bcopy(lladdr, LLADDR(sdl), ifp->if_addrlen);
1550 1.2 itojun }
1551 1.2 itojun
1552 1.2 itojun if (!is_newentry) {
1553 1.52 itojun if ((!olladdr && lladdr) /* (3) */
1554 1.52 itojun || (olladdr && lladdr && llchange)) { /* (5) */
1555 1.2 itojun do_update = 1;
1556 1.2 itojun newstate = ND6_LLINFO_STALE;
1557 1.52 itojun } else /* (1-2,4) */
1558 1.2 itojun do_update = 0;
1559 1.2 itojun } else {
1560 1.2 itojun do_update = 1;
1561 1.52 itojun if (!lladdr) /* (6) */
1562 1.2 itojun newstate = ND6_LLINFO_NOSTATE;
1563 1.52 itojun else /* (7) */
1564 1.2 itojun newstate = ND6_LLINFO_STALE;
1565 1.2 itojun }
1566 1.2 itojun
1567 1.2 itojun if (do_update) {
1568 1.2 itojun /*
1569 1.2 itojun * Update the state of the neighbor cache.
1570 1.2 itojun */
1571 1.2 itojun ln->ln_state = newstate;
1572 1.2 itojun
1573 1.2 itojun if (ln->ln_state == ND6_LLINFO_STALE) {
1574 1.44 itojun /*
1575 1.44 itojun * XXX: since nd6_output() below will cause
1576 1.44 itojun * state tansition to DELAY and reset the timer,
1577 1.44 itojun * we must set the timer now, although it is actually
1578 1.44 itojun * meaningless.
1579 1.44 itojun */
1580 1.44 itojun ln->ln_expire = time_second + nd6_gctimer;
1581 1.44 itojun
1582 1.2 itojun if (ln->ln_hold) {
1583 1.30 itojun /*
1584 1.30 itojun * we assume ifp is not a p2p here, so just
1585 1.30 itojun * set the 2nd argument as the 1st one.
1586 1.30 itojun */
1587 1.30 itojun nd6_output(ifp, ifp, ln->ln_hold,
1588 1.12 itojun (struct sockaddr_in6 *)rt_key(rt),
1589 1.12 itojun rt);
1590 1.44 itojun ln->ln_hold = NULL;
1591 1.2 itojun }
1592 1.2 itojun } else if (ln->ln_state == ND6_LLINFO_INCOMPLETE) {
1593 1.2 itojun /* probe right away */
1594 1.2 itojun ln->ln_expire = time_second;
1595 1.2 itojun }
1596 1.2 itojun }
1597 1.2 itojun
1598 1.2 itojun /*
1599 1.2 itojun * ICMP6 type dependent behavior.
1600 1.2 itojun *
1601 1.2 itojun * NS: clear IsRouter if new entry
1602 1.2 itojun * RS: clear IsRouter
1603 1.2 itojun * RA: set IsRouter if there's lladdr
1604 1.2 itojun * redir: clear IsRouter if new entry
1605 1.2 itojun *
1606 1.2 itojun * RA case, (1):
1607 1.2 itojun * The spec says that we must set IsRouter in the following cases:
1608 1.2 itojun * - If lladdr exist, set IsRouter. This means (1-5).
1609 1.2 itojun * - If it is old entry (!newentry), set IsRouter. This means (7).
1610 1.2 itojun * So, based on the spec, in (1-5) and (7) cases we must set IsRouter.
1611 1.2 itojun * A quetion arises for (1) case. (1) case has no lladdr in the
1612 1.2 itojun * neighbor cache, this is similar to (6).
1613 1.2 itojun * This case is rare but we figured that we MUST NOT set IsRouter.
1614 1.2 itojun *
1615 1.2 itojun * newentry olladdr lladdr llchange NS RS RA redir
1616 1.8 itojun * D R
1617 1.8 itojun * 0 n n -- (1) c ? s
1618 1.8 itojun * 0 y n -- (2) c s s
1619 1.8 itojun * 0 n y -- (3) c s s
1620 1.8 itojun * 0 y y n (4) c s s
1621 1.8 itojun * 0 y y y (5) c s s
1622 1.8 itojun * 1 -- n -- (6) c c c s
1623 1.8 itojun * 1 -- y -- (7) c c s c s
1624 1.2 itojun *
1625 1.2 itojun * (c=clear s=set)
1626 1.2 itojun */
1627 1.2 itojun switch (type & 0xff) {
1628 1.2 itojun case ND_NEIGHBOR_SOLICIT:
1629 1.2 itojun /*
1630 1.2 itojun * New entry must have is_router flag cleared.
1631 1.2 itojun */
1632 1.52 itojun if (is_newentry) /* (6-7) */
1633 1.8 itojun ln->ln_router = 0;
1634 1.8 itojun break;
1635 1.8 itojun case ND_REDIRECT:
1636 1.8 itojun /*
1637 1.8 itojun * If the icmp is a redirect to a better router, always set the
1638 1.52 itojun * is_router flag. Otherwise, if the entry is newly created,
1639 1.52 itojun * clear the flag. [RFC 2461, sec 8.3]
1640 1.8 itojun */
1641 1.8 itojun if (code == ND_REDIRECT_ROUTER)
1642 1.8 itojun ln->ln_router = 1;
1643 1.52 itojun else if (is_newentry) /* (6-7) */
1644 1.2 itojun ln->ln_router = 0;
1645 1.2 itojun break;
1646 1.2 itojun case ND_ROUTER_SOLICIT:
1647 1.2 itojun /*
1648 1.2 itojun * is_router flag must always be cleared.
1649 1.2 itojun */
1650 1.2 itojun ln->ln_router = 0;
1651 1.2 itojun break;
1652 1.2 itojun case ND_ROUTER_ADVERT:
1653 1.2 itojun /*
1654 1.2 itojun * Mark an entry with lladdr as a router.
1655 1.2 itojun */
1656 1.54 itojun if ((!is_newentry && (olladdr || lladdr)) /* (2-5) */
1657 1.54 itojun || (is_newentry && lladdr)) { /* (7) */
1658 1.2 itojun ln->ln_router = 1;
1659 1.2 itojun }
1660 1.2 itojun break;
1661 1.2 itojun }
1662 1.47 itojun
1663 1.47 itojun /*
1664 1.47 itojun * When the link-layer address of a router changes, select the
1665 1.47 itojun * best router again. In particular, when the neighbor entry is newly
1666 1.47 itojun * created, it might affect the selection policy.
1667 1.47 itojun * Question: can we restrict the first condition to the "is_newentry"
1668 1.47 itojun * case?
1669 1.47 itojun * XXX: when we hear an RA from a new router with the link-layer
1670 1.47 itojun * address option, defrouter_select() is called twice, since
1671 1.47 itojun * defrtrlist_update called the function as well. However, I believe
1672 1.47 itojun * we can compromise the overhead, since it only happens the first
1673 1.47 itojun * time.
1674 1.52 itojun * XXX: although defrouter_select() should not have a bad effect
1675 1.52 itojun * for those are not autoconfigured hosts, we explicitly avoid such
1676 1.52 itojun * cases for safety.
1677 1.47 itojun */
1678 1.49 itojun if (do_update && ln->ln_router && !ip6_forwarding && ip6_accept_rtadv)
1679 1.47 itojun defrouter_select();
1680 1.2 itojun
1681 1.2 itojun return rt;
1682 1.2 itojun }
1683 1.2 itojun
1684 1.2 itojun static void
1685 1.2 itojun nd6_slowtimo(ignored_arg)
1686 1.2 itojun void *ignored_arg;
1687 1.2 itojun {
1688 1.5 itojun int s = splsoftnet();
1689 1.38 itojun struct nd_ifinfo *nd6if;
1690 1.58 itojun struct ifnet *ifp;
1691 1.2 itojun
1692 1.20 thorpej callout_reset(&nd6_slowtimo_ch, ND6_SLOWTIMER_INTERVAL * hz,
1693 1.20 thorpej nd6_slowtimo, NULL);
1694 1.58 itojun for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list))
1695 1.58 itojun {
1696 1.58 itojun nd6if = ND_IFINFO(ifp);
1697 1.2 itojun if (nd6if->basereachable && /* already initialized */
1698 1.2 itojun (nd6if->recalctm -= ND6_SLOWTIMER_INTERVAL) <= 0) {
1699 1.2 itojun /*
1700 1.2 itojun * Since reachable time rarely changes by router
1701 1.2 itojun * advertisements, we SHOULD insure that a new random
1702 1.2 itojun * value gets recomputed at least once every few hours.
1703 1.2 itojun * (RFC 2461, 6.3.4)
1704 1.2 itojun */
1705 1.2 itojun nd6if->recalctm = nd6_recalc_reachtm_interval;
1706 1.2 itojun nd6if->reachable = ND_COMPUTE_RTIME(nd6if->basereachable);
1707 1.2 itojun }
1708 1.2 itojun }
1709 1.2 itojun splx(s);
1710 1.2 itojun }
1711 1.2 itojun
1712 1.2 itojun #define senderr(e) { error = (e); goto bad;}
1713 1.2 itojun int
1714 1.30 itojun nd6_output(ifp, origifp, m0, dst, rt0)
1715 1.38 itojun struct ifnet *ifp;
1716 1.30 itojun struct ifnet *origifp;
1717 1.2 itojun struct mbuf *m0;
1718 1.2 itojun struct sockaddr_in6 *dst;
1719 1.2 itojun struct rtentry *rt0;
1720 1.2 itojun {
1721 1.38 itojun struct mbuf *m = m0;
1722 1.38 itojun struct rtentry *rt = rt0;
1723 1.29 itojun struct sockaddr_in6 *gw6 = NULL;
1724 1.2 itojun struct llinfo_nd6 *ln = NULL;
1725 1.2 itojun int error = 0;
1726 1.12 itojun long time_second = time.tv_sec;
1727 1.2 itojun
1728 1.2 itojun if (IN6_IS_ADDR_MULTICAST(&dst->sin6_addr))
1729 1.2 itojun goto sendpkt;
1730 1.2 itojun
1731 1.54 itojun if (nd6_need_cache(ifp) == 0)
1732 1.2 itojun goto sendpkt;
1733 1.2 itojun
1734 1.2 itojun /*
1735 1.54 itojun * next hop determination. This routine is derived from ether_outpout.
1736 1.2 itojun */
1737 1.2 itojun if (rt) {
1738 1.2 itojun if ((rt->rt_flags & RTF_UP) == 0) {
1739 1.2 itojun if ((rt0 = rt = rtalloc1((struct sockaddr *)dst, 1)) !=
1740 1.12 itojun NULL)
1741 1.12 itojun {
1742 1.2 itojun rt->rt_refcnt--;
1743 1.30 itojun if (rt->rt_ifp != ifp) {
1744 1.30 itojun /* XXX: loop care? */
1745 1.30 itojun return nd6_output(ifp, origifp, m0,
1746 1.30 itojun dst, rt);
1747 1.30 itojun }
1748 1.25 itojun } else
1749 1.2 itojun senderr(EHOSTUNREACH);
1750 1.2 itojun }
1751 1.29 itojun
1752 1.2 itojun if (rt->rt_flags & RTF_GATEWAY) {
1753 1.29 itojun gw6 = (struct sockaddr_in6 *)rt->rt_gateway;
1754 1.29 itojun
1755 1.29 itojun /*
1756 1.29 itojun * We skip link-layer address resolution and NUD
1757 1.29 itojun * if the gateway is not a neighbor from ND point
1758 1.56 itojun * of view, regardless the value of nd_ifinfo.flags.
1759 1.56 itojun * The second condition is a bit tricky; we skip
1760 1.29 itojun * if the gateway is our own address, which is
1761 1.29 itojun * sometimes used to install a route to a p2p link.
1762 1.29 itojun */
1763 1.29 itojun if (!nd6_is_addr_neighbor(gw6, ifp) ||
1764 1.29 itojun in6ifa_ifpwithaddr(ifp, &gw6->sin6_addr)) {
1765 1.29 itojun /*
1766 1.29 itojun * We allow this kind of tricky route only
1767 1.29 itojun * when the outgoing interface is p2p.
1768 1.29 itojun * XXX: we may need a more generic rule here.
1769 1.29 itojun */
1770 1.29 itojun if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
1771 1.29 itojun senderr(EHOSTUNREACH);
1772 1.29 itojun
1773 1.29 itojun goto sendpkt;
1774 1.29 itojun }
1775 1.29 itojun
1776 1.2 itojun if (rt->rt_gwroute == 0)
1777 1.2 itojun goto lookup;
1778 1.2 itojun if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {
1779 1.2 itojun rtfree(rt); rt = rt0;
1780 1.50 itojun lookup:
1781 1.50 itojun rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);
1782 1.2 itojun if ((rt = rt->rt_gwroute) == 0)
1783 1.2 itojun senderr(EHOSTUNREACH);
1784 1.50 itojun /* the "G" test below also prevents rt == rt0 */
1785 1.50 itojun if ((rt->rt_flags & RTF_GATEWAY) ||
1786 1.50 itojun (rt->rt_ifp != ifp)) {
1787 1.50 itojun rt->rt_refcnt--;
1788 1.50 itojun rt0->rt_gwroute = 0;
1789 1.50 itojun senderr(EHOSTUNREACH);
1790 1.50 itojun }
1791 1.2 itojun }
1792 1.2 itojun }
1793 1.2 itojun }
1794 1.2 itojun
1795 1.2 itojun /*
1796 1.2 itojun * Address resolution or Neighbor Unreachability Detection
1797 1.2 itojun * for the next hop.
1798 1.2 itojun * At this point, the destination of the packet must be a unicast
1799 1.2 itojun * or an anycast address(i.e. not a multicast).
1800 1.2 itojun */
1801 1.2 itojun
1802 1.2 itojun /* Look up the neighbor cache for the nexthop */
1803 1.2 itojun if (rt && (rt->rt_flags & RTF_LLINFO) != 0)
1804 1.2 itojun ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1805 1.2 itojun else {
1806 1.29 itojun /*
1807 1.29 itojun * Since nd6_is_addr_neighbor() internally calls nd6_lookup(),
1808 1.52 itojun * the condition below is not very efficient. But we believe
1809 1.29 itojun * it is tolerable, because this should be a rare case.
1810 1.29 itojun */
1811 1.29 itojun if (nd6_is_addr_neighbor(dst, ifp) &&
1812 1.29 itojun (rt = nd6_lookup(&dst->sin6_addr, 1, ifp)) != NULL)
1813 1.2 itojun ln = (struct llinfo_nd6 *)rt->rt_llinfo;
1814 1.2 itojun }
1815 1.2 itojun if (!ln || !rt) {
1816 1.29 itojun if ((ifp->if_flags & IFF_POINTOPOINT) == 0 &&
1817 1.58 itojun !(ND_IFINFO(ifp)->flags & ND6_IFF_PERFORMNUD)) {
1818 1.29 itojun log(LOG_DEBUG,
1819 1.29 itojun "nd6_output: can't allocate llinfo for %s "
1820 1.29 itojun "(ln=%p, rt=%p)\n",
1821 1.29 itojun ip6_sprintf(&dst->sin6_addr), ln, rt);
1822 1.29 itojun senderr(EIO); /* XXX: good error? */
1823 1.29 itojun }
1824 1.29 itojun
1825 1.29 itojun goto sendpkt; /* send anyway */
1826 1.2 itojun }
1827 1.2 itojun
1828 1.26 itojun /* We don't have to do link-layer address resolution on a p2p link. */
1829 1.26 itojun if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
1830 1.42 itojun ln->ln_state < ND6_LLINFO_REACHABLE) {
1831 1.26 itojun ln->ln_state = ND6_LLINFO_STALE;
1832 1.42 itojun ln->ln_expire = time_second + nd6_gctimer;
1833 1.42 itojun }
1834 1.2 itojun
1835 1.2 itojun /*
1836 1.2 itojun * The first time we send a packet to a neighbor whose entry is
1837 1.2 itojun * STALE, we have to change the state to DELAY and a sets a timer to
1838 1.2 itojun * expire in DELAY_FIRST_PROBE_TIME seconds to ensure do
1839 1.2 itojun * neighbor unreachability detection on expiration.
1840 1.2 itojun * (RFC 2461 7.3.3)
1841 1.2 itojun */
1842 1.2 itojun if (ln->ln_state == ND6_LLINFO_STALE) {
1843 1.2 itojun ln->ln_asked = 0;
1844 1.2 itojun ln->ln_state = ND6_LLINFO_DELAY;
1845 1.2 itojun ln->ln_expire = time_second + nd6_delay;
1846 1.2 itojun }
1847 1.2 itojun
1848 1.2 itojun /*
1849 1.2 itojun * If the neighbor cache entry has a state other than INCOMPLETE
1850 1.52 itojun * (i.e. its link-layer address is already resolved), just
1851 1.2 itojun * send the packet.
1852 1.2 itojun */
1853 1.2 itojun if (ln->ln_state > ND6_LLINFO_INCOMPLETE)
1854 1.2 itojun goto sendpkt;
1855 1.2 itojun
1856 1.2 itojun /*
1857 1.2 itojun * There is a neighbor cache entry, but no ethernet address
1858 1.52 itojun * response yet. Replace the held mbuf (if any) with this
1859 1.2 itojun * latest one.
1860 1.2 itojun */
1861 1.41 itojun if (ln->ln_state == ND6_LLINFO_NOSTATE)
1862 1.2 itojun ln->ln_state = ND6_LLINFO_INCOMPLETE;
1863 1.2 itojun if (ln->ln_hold)
1864 1.2 itojun m_freem(ln->ln_hold);
1865 1.2 itojun ln->ln_hold = m;
1866 1.64 itojun /*
1867 1.64 itojun * If there has been no NS for the neighbor after entering the
1868 1.64 itojun * INCOMPLETE state, send the first solicitation.
1869 1.64 itojun * Technically this can be against the rate-limiting rule described in
1870 1.64 itojun * Section 7.2.2 of RFC 2461 because the interval to the next scheduled
1871 1.64 itojun * solicitation issued in nd6_timer() may be less than the specified
1872 1.64 itojun * retransmission time. This should not be a problem from a practical
1873 1.64 itojun * point of view, because we'll typically see an immediate response
1874 1.64 itojun * from the neighbor, which suppresses the succeeding solicitations.
1875 1.64 itojun */
1876 1.64 itojun if (ln->ln_expire && ln->ln_asked == 0) {
1877 1.64 itojun ln->ln_asked++;
1878 1.64 itojun ln->ln_expire = time_second +
1879 1.64 itojun ND6_RETRANS_SEC(ND_IFINFO(ifp)->retrans);
1880 1.64 itojun nd6_ns_output(ifp, NULL, &dst->sin6_addr, ln, 0);
1881 1.2 itojun }
1882 1.2 itojun return(0);
1883 1.63 itojun
1884 1.2 itojun sendpkt:
1885 1.30 itojun
1886 1.43 itojun if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
1887 1.30 itojun return((*ifp->if_output)(origifp, m, (struct sockaddr *)dst,
1888 1.30 itojun rt));
1889 1.30 itojun }
1890 1.2 itojun return((*ifp->if_output)(ifp, m, (struct sockaddr *)dst, rt));
1891 1.25 itojun
1892 1.2 itojun bad:
1893 1.2 itojun if (m)
1894 1.2 itojun m_freem(m);
1895 1.2 itojun return (error);
1896 1.63 itojun }
1897 1.2 itojun #undef senderr
1898 1.54 itojun
1899 1.54 itojun int
1900 1.54 itojun nd6_need_cache(ifp)
1901 1.54 itojun struct ifnet *ifp;
1902 1.54 itojun {
1903 1.54 itojun /*
1904 1.54 itojun * XXX: we currently do not make neighbor cache on any interface
1905 1.54 itojun * other than ARCnet, Ethernet, FDDI and GIF.
1906 1.54 itojun *
1907 1.54 itojun * RFC2893 says:
1908 1.54 itojun * - unidirectional tunnels needs no ND
1909 1.54 itojun */
1910 1.54 itojun switch (ifp->if_type) {
1911 1.54 itojun case IFT_ARCNET:
1912 1.54 itojun case IFT_ETHER:
1913 1.54 itojun case IFT_FDDI:
1914 1.54 itojun case IFT_IEEE1394:
1915 1.54 itojun case IFT_GIF: /* XXX need more cases? */
1916 1.54 itojun return(1);
1917 1.54 itojun default:
1918 1.54 itojun return(0);
1919 1.54 itojun }
1920 1.54 itojun }
1921 1.2 itojun
1922 1.2 itojun int
1923 1.2 itojun nd6_storelladdr(ifp, rt, m, dst, desten)
1924 1.2 itojun struct ifnet *ifp;
1925 1.2 itojun struct rtentry *rt;
1926 1.2 itojun struct mbuf *m;
1927 1.2 itojun struct sockaddr *dst;
1928 1.2 itojun u_char *desten;
1929 1.2 itojun {
1930 1.2 itojun struct sockaddr_dl *sdl;
1931 1.2 itojun
1932 1.2 itojun if (m->m_flags & M_MCAST) {
1933 1.2 itojun switch (ifp->if_type) {
1934 1.2 itojun case IFT_ETHER:
1935 1.63 itojun case IFT_FDDI:
1936 1.2 itojun ETHER_MAP_IPV6_MULTICAST(&SIN6(dst)->sin6_addr,
1937 1.2 itojun desten);
1938 1.9 is return(1);
1939 1.33 onoe case IFT_IEEE1394:
1940 1.33 onoe bcopy(ifp->if_broadcastaddr, desten, ifp->if_addrlen);
1941 1.33 onoe return(1);
1942 1.9 is case IFT_ARCNET:
1943 1.9 is *desten = 0;
1944 1.2 itojun return(1);
1945 1.2 itojun default:
1946 1.43 itojun m_freem(m);
1947 1.2 itojun return(0);
1948 1.2 itojun }
1949 1.2 itojun }
1950 1.2 itojun
1951 1.32 itojun if (rt == NULL) {
1952 1.32 itojun /* this could happen, if we could not allocate memory */
1953 1.43 itojun m_freem(m);
1954 1.32 itojun return(0);
1955 1.32 itojun }
1956 1.32 itojun if (rt->rt_gateway->sa_family != AF_LINK) {
1957 1.2 itojun printf("nd6_storelladdr: something odd happens\n");
1958 1.43 itojun m_freem(m);
1959 1.2 itojun return(0);
1960 1.2 itojun }
1961 1.2 itojun sdl = SDL(rt->rt_gateway);
1962 1.23 itojun if (sdl->sdl_alen == 0) {
1963 1.24 itojun /* this should be impossible, but we bark here for debugging */
1964 1.56 itojun printf("nd6_storelladdr: sdl_alen == 0, dst=%s, if=%s\n",
1965 1.56 itojun ip6_sprintf(&SIN6(dst)->sin6_addr), if_name(ifp));
1966 1.43 itojun m_freem(m);
1967 1.23 itojun return(0);
1968 1.23 itojun }
1969 1.2 itojun
1970 1.23 itojun bcopy(LLADDR(sdl), desten, sdl->sdl_alen);
1971 1.2 itojun return(1);
1972 1.2 itojun }
1973