1/*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
30 */
31
32/*-
33 * Copyright (c) 1982, 1986, 1988, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
61 */
62
63#include <sys/cdefs.h>
| 1/*-
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 itojun Exp $
30 */
31
32/*-
33 * Copyright (c) 1982, 1986, 1988, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
61 */
62
63#include <sys/cdefs.h>
|
64__FBSDID("$FreeBSD: head/sys/netinet6/icmp6.c 191340 2009-04-20 22:45:21Z rwatson $");
| 64__FBSDID("$FreeBSD: head/sys/netinet6/icmp6.c 191672 2009-04-29 19:19:13Z bms $");
|
65
66#include "opt_inet.h"
67#include "opt_inet6.h"
68#include "opt_ipsec.h"
69#include "opt_route.h"
70
71#include <sys/param.h>
72#include <sys/domain.h>
73#include <sys/kernel.h>
74#include <sys/lock.h>
75#include <sys/malloc.h>
76#include <sys/mbuf.h>
77#include <sys/protosw.h>
78#include <sys/signalvar.h>
79#include <sys/socket.h>
80#include <sys/socketvar.h>
81#include <sys/sx.h>
82#include <sys/syslog.h>
83#include <sys/systm.h>
84#include <sys/time.h>
85#include <sys/vimage.h>
86
87#include <net/if.h>
88#include <net/if_dl.h>
89#include <net/if_llatbl.h>
90#include <net/if_types.h>
91#include <net/route.h>
92#include <net/vnet.h>
93
94#include <netinet/in.h>
95#include <netinet/in_pcb.h>
96#include <netinet/in_var.h>
97#include <netinet/ip6.h>
98#include <netinet/icmp6.h>
99#include <netinet/tcp_var.h>
100#include <netinet/vinet.h>
101
102#include <netinet6/in6_ifattach.h>
103#include <netinet6/in6_pcb.h>
104#include <netinet6/ip6protosw.h>
105#include <netinet6/ip6_var.h>
106#include <netinet6/scope6_var.h>
107#include <netinet6/mld6_var.h>
108#include <netinet6/nd6.h>
109#include <netinet6/vinet6.h>
110
111#ifdef IPSEC
112#include <netipsec/ipsec.h>
113#include <netipsec/key.h>
114#endif
115
116extern struct domain inet6domain;
117
118#ifdef VIMAGE_GLOBALS
119extern struct inpcbinfo ripcbinfo;
120extern struct inpcbhead ripcb;
121extern int icmp6errppslim;
122extern int icmp6_nodeinfo;
123
124struct icmp6stat icmp6stat;
125static int icmp6errpps_count;
126static struct timeval icmp6errppslim_last;
127#endif
128
129static void icmp6_errcount(struct icmp6errstat *, int, int);
130static int icmp6_rip6_input(struct mbuf **, int);
131static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
132static const char *icmp6_redirect_diag __P((struct in6_addr *,
133 struct in6_addr *, struct in6_addr *));
134static struct mbuf *ni6_input(struct mbuf *, int);
135static struct mbuf *ni6_nametodns(const char *, int, int);
136static int ni6_dnsmatch(const char *, int, const char *, int);
137static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
138 struct ifnet **, struct in6_addr *));
139static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
140 struct ifnet *, int));
141static int icmp6_notify_error(struct mbuf **, int, int, int);
142
143
144void
145icmp6_init(void)
146{
147 INIT_VNET_INET6(curvnet);
148
149 V_icmp6errpps_count = 0;
| 65
66#include "opt_inet.h"
67#include "opt_inet6.h"
68#include "opt_ipsec.h"
69#include "opt_route.h"
70
71#include <sys/param.h>
72#include <sys/domain.h>
73#include <sys/kernel.h>
74#include <sys/lock.h>
75#include <sys/malloc.h>
76#include <sys/mbuf.h>
77#include <sys/protosw.h>
78#include <sys/signalvar.h>
79#include <sys/socket.h>
80#include <sys/socketvar.h>
81#include <sys/sx.h>
82#include <sys/syslog.h>
83#include <sys/systm.h>
84#include <sys/time.h>
85#include <sys/vimage.h>
86
87#include <net/if.h>
88#include <net/if_dl.h>
89#include <net/if_llatbl.h>
90#include <net/if_types.h>
91#include <net/route.h>
92#include <net/vnet.h>
93
94#include <netinet/in.h>
95#include <netinet/in_pcb.h>
96#include <netinet/in_var.h>
97#include <netinet/ip6.h>
98#include <netinet/icmp6.h>
99#include <netinet/tcp_var.h>
100#include <netinet/vinet.h>
101
102#include <netinet6/in6_ifattach.h>
103#include <netinet6/in6_pcb.h>
104#include <netinet6/ip6protosw.h>
105#include <netinet6/ip6_var.h>
106#include <netinet6/scope6_var.h>
107#include <netinet6/mld6_var.h>
108#include <netinet6/nd6.h>
109#include <netinet6/vinet6.h>
110
111#ifdef IPSEC
112#include <netipsec/ipsec.h>
113#include <netipsec/key.h>
114#endif
115
116extern struct domain inet6domain;
117
118#ifdef VIMAGE_GLOBALS
119extern struct inpcbinfo ripcbinfo;
120extern struct inpcbhead ripcb;
121extern int icmp6errppslim;
122extern int icmp6_nodeinfo;
123
124struct icmp6stat icmp6stat;
125static int icmp6errpps_count;
126static struct timeval icmp6errppslim_last;
127#endif
128
129static void icmp6_errcount(struct icmp6errstat *, int, int);
130static int icmp6_rip6_input(struct mbuf **, int);
131static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
132static const char *icmp6_redirect_diag __P((struct in6_addr *,
133 struct in6_addr *, struct in6_addr *));
134static struct mbuf *ni6_input(struct mbuf *, int);
135static struct mbuf *ni6_nametodns(const char *, int, int);
136static int ni6_dnsmatch(const char *, int, const char *, int);
137static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
138 struct ifnet **, struct in6_addr *));
139static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
140 struct ifnet *, int));
141static int icmp6_notify_error(struct mbuf **, int, int, int);
142
143
144void
145icmp6_init(void)
146{
147 INIT_VNET_INET6(curvnet);
148
149 V_icmp6errpps_count = 0;
|
150
151 mld6_init();
| |
152}
153
154static void
155icmp6_errcount(struct icmp6errstat *stat, int type, int code)
156{
157 switch (type) {
158 case ICMP6_DST_UNREACH:
159 switch (code) {
160 case ICMP6_DST_UNREACH_NOROUTE:
161 stat->icp6errs_dst_unreach_noroute++;
162 return;
163 case ICMP6_DST_UNREACH_ADMIN:
164 stat->icp6errs_dst_unreach_admin++;
165 return;
166 case ICMP6_DST_UNREACH_BEYONDSCOPE:
167 stat->icp6errs_dst_unreach_beyondscope++;
168 return;
169 case ICMP6_DST_UNREACH_ADDR:
170 stat->icp6errs_dst_unreach_addr++;
171 return;
172 case ICMP6_DST_UNREACH_NOPORT:
173 stat->icp6errs_dst_unreach_noport++;
174 return;
175 }
176 break;
177 case ICMP6_PACKET_TOO_BIG:
178 stat->icp6errs_packet_too_big++;
179 return;
180 case ICMP6_TIME_EXCEEDED:
181 switch (code) {
182 case ICMP6_TIME_EXCEED_TRANSIT:
183 stat->icp6errs_time_exceed_transit++;
184 return;
185 case ICMP6_TIME_EXCEED_REASSEMBLY:
186 stat->icp6errs_time_exceed_reassembly++;
187 return;
188 }
189 break;
190 case ICMP6_PARAM_PROB:
191 switch (code) {
192 case ICMP6_PARAMPROB_HEADER:
193 stat->icp6errs_paramprob_header++;
194 return;
195 case ICMP6_PARAMPROB_NEXTHEADER:
196 stat->icp6errs_paramprob_nextheader++;
197 return;
198 case ICMP6_PARAMPROB_OPTION:
199 stat->icp6errs_paramprob_option++;
200 return;
201 }
202 break;
203 case ND_REDIRECT:
204 stat->icp6errs_redirect++;
205 return;
206 }
207 stat->icp6errs_unknown++;
208}
209
210/*
211 * A wrapper function for icmp6_error() necessary when the erroneous packet
212 * may not contain enough scope zone information.
213 */
214void
215icmp6_error2(struct mbuf *m, int type, int code, int param,
216 struct ifnet *ifp)
217{
218 INIT_VNET_INET6(curvnet);
219 struct ip6_hdr *ip6;
220
221 if (ifp == NULL)
222 return;
223
224#ifndef PULLDOWN_TEST
225 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
226#else
227 if (m->m_len < sizeof(struct ip6_hdr)) {
228 m = m_pullup(m, sizeof(struct ip6_hdr));
229 if (m == NULL)
230 return;
231 }
232#endif
233
234 ip6 = mtod(m, struct ip6_hdr *);
235
236 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
237 return;
238 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
239 return;
240
241 icmp6_error(m, type, code, param);
242}
243
244/*
245 * Generate an error packet of type error in response to bad IP6 packet.
246 */
247void
248icmp6_error(struct mbuf *m, int type, int code, int param)
249{
250 INIT_VNET_INET6(curvnet);
251 struct ip6_hdr *oip6, *nip6;
252 struct icmp6_hdr *icmp6;
253 u_int preplen;
254 int off;
255 int nxt;
256
257 ICMP6STAT_INC(icp6s_error);
258
259 /* count per-type-code statistics */
260 icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, type, code);
261
262#ifdef M_DECRYPTED /*not openbsd*/
263 if (m->m_flags & M_DECRYPTED) {
264 ICMP6STAT_INC(icp6s_canterror);
265 goto freeit;
266 }
267#endif
268
269#ifndef PULLDOWN_TEST
270 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
271#else
272 if (m->m_len < sizeof(struct ip6_hdr)) {
273 m = m_pullup(m, sizeof(struct ip6_hdr));
274 if (m == NULL)
275 return;
276 }
277#endif
278 oip6 = mtod(m, struct ip6_hdr *);
279
280 /*
281 * If the destination address of the erroneous packet is a multicast
282 * address, or the packet was sent using link-layer multicast,
283 * we should basically suppress sending an error (RFC 2463, Section
284 * 2.4).
285 * We have two exceptions (the item e.2 in that section):
286 * - the Pakcet Too Big message can be sent for path MTU discovery.
287 * - the Parameter Problem Message that can be allowed an icmp6 error
288 * in the option type field. This check has been done in
289 * ip6_unknown_opt(), so we can just check the type and code.
290 */
291 if ((m->m_flags & (M_BCAST|M_MCAST) ||
292 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
293 (type != ICMP6_PACKET_TOO_BIG &&
294 (type != ICMP6_PARAM_PROB ||
295 code != ICMP6_PARAMPROB_OPTION)))
296 goto freeit;
297
298 /*
299 * RFC 2463, 2.4 (e.5): source address check.
300 * XXX: the case of anycast source?
301 */
302 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
303 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
304 goto freeit;
305
306 /*
307 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
308 * don't do it.
309 */
310 nxt = -1;
311 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
312 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
313 struct icmp6_hdr *icp;
314
315#ifndef PULLDOWN_TEST
316 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
317 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
318#else
319 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
320 sizeof(*icp));
321 if (icp == NULL) {
322 ICMP6STAT_INC(icp6s_tooshort);
323 return;
324 }
325#endif
326 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
327 icp->icmp6_type == ND_REDIRECT) {
328 /*
329 * ICMPv6 error
330 * Special case: for redirect (which is
331 * informational) we must not send icmp6 error.
332 */
333 ICMP6STAT_INC(icp6s_canterror);
334 goto freeit;
335 } else {
336 /* ICMPv6 informational - send the error */
337 }
338 } else {
339 /* non-ICMPv6 - send the error */
340 }
341
342 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
343
344 /* Finally, do rate limitation check. */
345 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
346 ICMP6STAT_INC(icp6s_toofreq);
347 goto freeit;
348 }
349
350 /*
351 * OK, ICMP6 can be generated.
352 */
353
354 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
355 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
356
357 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
358 M_PREPEND(m, preplen, M_DONTWAIT);
359 if (m && m->m_len < preplen)
360 m = m_pullup(m, preplen);
361 if (m == NULL) {
362 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
363 return;
364 }
365
366 nip6 = mtod(m, struct ip6_hdr *);
367 nip6->ip6_src = oip6->ip6_src;
368 nip6->ip6_dst = oip6->ip6_dst;
369
370 in6_clearscope(&oip6->ip6_src);
371 in6_clearscope(&oip6->ip6_dst);
372
373 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
374 icmp6->icmp6_type = type;
375 icmp6->icmp6_code = code;
376 icmp6->icmp6_pptr = htonl((u_int32_t)param);
377
378 /*
379 * icmp6_reflect() is designed to be in the input path.
380 * icmp6_error() can be called from both input and output path,
381 * and if we are in output path rcvif could contain bogus value.
382 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
383 * information in ip header (nip6).
384 */
385 m->m_pkthdr.rcvif = NULL;
386
387 ICMP6STAT_INC(icp6s_outhist[type]);
388 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
389
390 return;
391
392 freeit:
393 /*
394 * If we can't tell whether or not we can generate ICMP6, free it.
395 */
396 m_freem(m);
397}
398
399/*
400 * Process a received ICMP6 message.
401 */
402int
403icmp6_input(struct mbuf **mp, int *offp, int proto)
404{
405 INIT_VNET_INET6(curvnet);
406 INIT_VPROCG(TD_TO_VPROCG(curthread)); /* XXX V_hostname needs this */
407 struct mbuf *m = *mp, *n;
408 struct ip6_hdr *ip6, *nip6;
409 struct icmp6_hdr *icmp6, *nicmp6;
410 int off = *offp;
411 int icmp6len = m->m_pkthdr.len - *offp;
412 int code, sum, noff;
413 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
414
415#ifndef PULLDOWN_TEST
416 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
417 /* m might change if M_LOOP. So, call mtod after this */
418#endif
419
420 /*
421 * Locate icmp6 structure in mbuf, and check
422 * that not corrupted and of at least minimum length
423 */
424
425 ip6 = mtod(m, struct ip6_hdr *);
426 if (icmp6len < sizeof(struct icmp6_hdr)) {
427 ICMP6STAT_INC(icp6s_tooshort);
428 goto freeit;
429 }
430
431 /*
| 150}
151
152static void
153icmp6_errcount(struct icmp6errstat *stat, int type, int code)
154{
155 switch (type) {
156 case ICMP6_DST_UNREACH:
157 switch (code) {
158 case ICMP6_DST_UNREACH_NOROUTE:
159 stat->icp6errs_dst_unreach_noroute++;
160 return;
161 case ICMP6_DST_UNREACH_ADMIN:
162 stat->icp6errs_dst_unreach_admin++;
163 return;
164 case ICMP6_DST_UNREACH_BEYONDSCOPE:
165 stat->icp6errs_dst_unreach_beyondscope++;
166 return;
167 case ICMP6_DST_UNREACH_ADDR:
168 stat->icp6errs_dst_unreach_addr++;
169 return;
170 case ICMP6_DST_UNREACH_NOPORT:
171 stat->icp6errs_dst_unreach_noport++;
172 return;
173 }
174 break;
175 case ICMP6_PACKET_TOO_BIG:
176 stat->icp6errs_packet_too_big++;
177 return;
178 case ICMP6_TIME_EXCEEDED:
179 switch (code) {
180 case ICMP6_TIME_EXCEED_TRANSIT:
181 stat->icp6errs_time_exceed_transit++;
182 return;
183 case ICMP6_TIME_EXCEED_REASSEMBLY:
184 stat->icp6errs_time_exceed_reassembly++;
185 return;
186 }
187 break;
188 case ICMP6_PARAM_PROB:
189 switch (code) {
190 case ICMP6_PARAMPROB_HEADER:
191 stat->icp6errs_paramprob_header++;
192 return;
193 case ICMP6_PARAMPROB_NEXTHEADER:
194 stat->icp6errs_paramprob_nextheader++;
195 return;
196 case ICMP6_PARAMPROB_OPTION:
197 stat->icp6errs_paramprob_option++;
198 return;
199 }
200 break;
201 case ND_REDIRECT:
202 stat->icp6errs_redirect++;
203 return;
204 }
205 stat->icp6errs_unknown++;
206}
207
208/*
209 * A wrapper function for icmp6_error() necessary when the erroneous packet
210 * may not contain enough scope zone information.
211 */
212void
213icmp6_error2(struct mbuf *m, int type, int code, int param,
214 struct ifnet *ifp)
215{
216 INIT_VNET_INET6(curvnet);
217 struct ip6_hdr *ip6;
218
219 if (ifp == NULL)
220 return;
221
222#ifndef PULLDOWN_TEST
223 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
224#else
225 if (m->m_len < sizeof(struct ip6_hdr)) {
226 m = m_pullup(m, sizeof(struct ip6_hdr));
227 if (m == NULL)
228 return;
229 }
230#endif
231
232 ip6 = mtod(m, struct ip6_hdr *);
233
234 if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
235 return;
236 if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
237 return;
238
239 icmp6_error(m, type, code, param);
240}
241
242/*
243 * Generate an error packet of type error in response to bad IP6 packet.
244 */
245void
246icmp6_error(struct mbuf *m, int type, int code, int param)
247{
248 INIT_VNET_INET6(curvnet);
249 struct ip6_hdr *oip6, *nip6;
250 struct icmp6_hdr *icmp6;
251 u_int preplen;
252 int off;
253 int nxt;
254
255 ICMP6STAT_INC(icp6s_error);
256
257 /* count per-type-code statistics */
258 icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, type, code);
259
260#ifdef M_DECRYPTED /*not openbsd*/
261 if (m->m_flags & M_DECRYPTED) {
262 ICMP6STAT_INC(icp6s_canterror);
263 goto freeit;
264 }
265#endif
266
267#ifndef PULLDOWN_TEST
268 IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
269#else
270 if (m->m_len < sizeof(struct ip6_hdr)) {
271 m = m_pullup(m, sizeof(struct ip6_hdr));
272 if (m == NULL)
273 return;
274 }
275#endif
276 oip6 = mtod(m, struct ip6_hdr *);
277
278 /*
279 * If the destination address of the erroneous packet is a multicast
280 * address, or the packet was sent using link-layer multicast,
281 * we should basically suppress sending an error (RFC 2463, Section
282 * 2.4).
283 * We have two exceptions (the item e.2 in that section):
284 * - the Pakcet Too Big message can be sent for path MTU discovery.
285 * - the Parameter Problem Message that can be allowed an icmp6 error
286 * in the option type field. This check has been done in
287 * ip6_unknown_opt(), so we can just check the type and code.
288 */
289 if ((m->m_flags & (M_BCAST|M_MCAST) ||
290 IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
291 (type != ICMP6_PACKET_TOO_BIG &&
292 (type != ICMP6_PARAM_PROB ||
293 code != ICMP6_PARAMPROB_OPTION)))
294 goto freeit;
295
296 /*
297 * RFC 2463, 2.4 (e.5): source address check.
298 * XXX: the case of anycast source?
299 */
300 if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
301 IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
302 goto freeit;
303
304 /*
305 * If we are about to send ICMPv6 against ICMPv6 error/redirect,
306 * don't do it.
307 */
308 nxt = -1;
309 off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
310 if (off >= 0 && nxt == IPPROTO_ICMPV6) {
311 struct icmp6_hdr *icp;
312
313#ifndef PULLDOWN_TEST
314 IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
315 icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
316#else
317 IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
318 sizeof(*icp));
319 if (icp == NULL) {
320 ICMP6STAT_INC(icp6s_tooshort);
321 return;
322 }
323#endif
324 if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
325 icp->icmp6_type == ND_REDIRECT) {
326 /*
327 * ICMPv6 error
328 * Special case: for redirect (which is
329 * informational) we must not send icmp6 error.
330 */
331 ICMP6STAT_INC(icp6s_canterror);
332 goto freeit;
333 } else {
334 /* ICMPv6 informational - send the error */
335 }
336 } else {
337 /* non-ICMPv6 - send the error */
338 }
339
340 oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
341
342 /* Finally, do rate limitation check. */
343 if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
344 ICMP6STAT_INC(icp6s_toofreq);
345 goto freeit;
346 }
347
348 /*
349 * OK, ICMP6 can be generated.
350 */
351
352 if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
353 m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
354
355 preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
356 M_PREPEND(m, preplen, M_DONTWAIT);
357 if (m && m->m_len < preplen)
358 m = m_pullup(m, preplen);
359 if (m == NULL) {
360 nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
361 return;
362 }
363
364 nip6 = mtod(m, struct ip6_hdr *);
365 nip6->ip6_src = oip6->ip6_src;
366 nip6->ip6_dst = oip6->ip6_dst;
367
368 in6_clearscope(&oip6->ip6_src);
369 in6_clearscope(&oip6->ip6_dst);
370
371 icmp6 = (struct icmp6_hdr *)(nip6 + 1);
372 icmp6->icmp6_type = type;
373 icmp6->icmp6_code = code;
374 icmp6->icmp6_pptr = htonl((u_int32_t)param);
375
376 /*
377 * icmp6_reflect() is designed to be in the input path.
378 * icmp6_error() can be called from both input and output path,
379 * and if we are in output path rcvif could contain bogus value.
380 * clear m->m_pkthdr.rcvif for safety, we should have enough scope
381 * information in ip header (nip6).
382 */
383 m->m_pkthdr.rcvif = NULL;
384
385 ICMP6STAT_INC(icp6s_outhist[type]);
386 icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
387
388 return;
389
390 freeit:
391 /*
392 * If we can't tell whether or not we can generate ICMP6, free it.
393 */
394 m_freem(m);
395}
396
397/*
398 * Process a received ICMP6 message.
399 */
400int
401icmp6_input(struct mbuf **mp, int *offp, int proto)
402{
403 INIT_VNET_INET6(curvnet);
404 INIT_VPROCG(TD_TO_VPROCG(curthread)); /* XXX V_hostname needs this */
405 struct mbuf *m = *mp, *n;
406 struct ip6_hdr *ip6, *nip6;
407 struct icmp6_hdr *icmp6, *nicmp6;
408 int off = *offp;
409 int icmp6len = m->m_pkthdr.len - *offp;
410 int code, sum, noff;
411 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
412
413#ifndef PULLDOWN_TEST
414 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
415 /* m might change if M_LOOP. So, call mtod after this */
416#endif
417
418 /*
419 * Locate icmp6 structure in mbuf, and check
420 * that not corrupted and of at least minimum length
421 */
422
423 ip6 = mtod(m, struct ip6_hdr *);
424 if (icmp6len < sizeof(struct icmp6_hdr)) {
425 ICMP6STAT_INC(icp6s_tooshort);
426 goto freeit;
427 }
428
429 /*
|
| 430 * Check multicast group membership.
431 * Note: SSM filters are not applied for ICMPv6 traffic.
432 */
433 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
434 struct ifnet *ifp;
435 struct in6_multi *inm;
436
437 ifp = m->m_pkthdr.rcvif;
438 inm = in6m_lookup(ifp, &ip6->ip6_dst);
439 if (inm == NULL) {
440 IP6STAT_INC(ip6s_notmember);
441 in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
442 goto freeit;
443 }
444 }
445
446 /*
|
432 * calculate the checksum
433 */
434#ifndef PULLDOWN_TEST
435 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
436#else
437 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
438 if (icmp6 == NULL) {
439 ICMP6STAT_INC(icp6s_tooshort);
440 return IPPROTO_DONE;
441 }
442#endif
443 code = icmp6->icmp6_code;
444
445 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
446 nd6log((LOG_ERR,
447 "ICMP6 checksum error(%d|%x) %s\n",
448 icmp6->icmp6_type, sum,
449 ip6_sprintf(ip6bufs, &ip6->ip6_src)));
450 ICMP6STAT_INC(icp6s_checksum);
451 goto freeit;
452 }
453
454 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
455 /*
456 * Deliver very specific ICMP6 type only.
457 * This is important to deliver TOOBIG. Otherwise PMTUD
458 * will not work.
459 */
460 switch (icmp6->icmp6_type) {
461 case ICMP6_DST_UNREACH:
462 case ICMP6_PACKET_TOO_BIG:
463 case ICMP6_TIME_EXCEEDED:
464 break;
465 default:
466 goto freeit;
467 }
468 }
469
470 ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
471 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
472 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
473 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
474
475 switch (icmp6->icmp6_type) {
476 case ICMP6_DST_UNREACH:
477 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
478 switch (code) {
479 case ICMP6_DST_UNREACH_NOROUTE:
480 code = PRC_UNREACH_NET;
481 break;
482 case ICMP6_DST_UNREACH_ADMIN:
483 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
484 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
485 break;
486 case ICMP6_DST_UNREACH_ADDR:
487 code = PRC_HOSTDEAD;
488 break;
489 case ICMP6_DST_UNREACH_BEYONDSCOPE:
490 /* I mean "source address was incorrect." */
491 code = PRC_PARAMPROB;
492 break;
493 case ICMP6_DST_UNREACH_NOPORT:
494 code = PRC_UNREACH_PORT;
495 break;
496 default:
497 goto badcode;
498 }
499 goto deliver;
500 break;
501
502 case ICMP6_PACKET_TOO_BIG:
503 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
504
505 /* validation is made in icmp6_mtudisc_update */
506
507 code = PRC_MSGSIZE;
508
509 /*
510 * Updating the path MTU will be done after examining
511 * intermediate extension headers.
512 */
513 goto deliver;
514 break;
515
516 case ICMP6_TIME_EXCEEDED:
517 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
518 switch (code) {
519 case ICMP6_TIME_EXCEED_TRANSIT:
520 code = PRC_TIMXCEED_INTRANS;
521 break;
522 case ICMP6_TIME_EXCEED_REASSEMBLY:
523 code = PRC_TIMXCEED_REASS;
524 break;
525 default:
526 goto badcode;
527 }
528 goto deliver;
529 break;
530
531 case ICMP6_PARAM_PROB:
532 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
533 switch (code) {
534 case ICMP6_PARAMPROB_NEXTHEADER:
535 code = PRC_UNREACH_PROTOCOL;
536 break;
537 case ICMP6_PARAMPROB_HEADER:
538 case ICMP6_PARAMPROB_OPTION:
539 code = PRC_PARAMPROB;
540 break;
541 default:
542 goto badcode;
543 }
544 goto deliver;
545 break;
546
547 case ICMP6_ECHO_REQUEST:
548 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
549 if (code != 0)
550 goto badcode;
551 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
552 /* Give up remote */
553 break;
554 }
555 if ((n->m_flags & M_EXT) != 0
556 || n->m_len < off + sizeof(struct icmp6_hdr)) {
557 struct mbuf *n0 = n;
558 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
559 int n0len;
560
561 MGETHDR(n, M_DONTWAIT, n0->m_type);
562 n0len = n0->m_pkthdr.len; /* save for use below */
563 if (n)
564 M_MOVE_PKTHDR(n, n0);
565 if (n && maxlen >= MHLEN) {
566 MCLGET(n, M_DONTWAIT);
567 if ((n->m_flags & M_EXT) == 0) {
568 m_free(n);
569 n = NULL;
570 }
571 }
572 if (n == NULL) {
573 /* Give up remote */
574 m_freem(n0);
575 break;
576 }
577 /*
578 * Copy IPv6 and ICMPv6 only.
579 */
580 nip6 = mtod(n, struct ip6_hdr *);
581 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
582 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
583 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
584 noff = sizeof(struct ip6_hdr);
585 /* new mbuf contains only ipv6+icmpv6 headers */
586 n->m_len = noff + sizeof(struct icmp6_hdr);
587 /*
588 * Adjust mbuf. ip6_plen will be adjusted in
589 * ip6_output().
590 */
591 m_adj(n0, off + sizeof(struct icmp6_hdr));
592 /* recalculate complete packet size */
593 n->m_pkthdr.len = n0len + (noff - off);
594 n->m_next = n0;
595 } else {
596 nip6 = mtod(n, struct ip6_hdr *);
597 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
598 sizeof(*nicmp6));
599 noff = off;
600 }
601 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
602 nicmp6->icmp6_code = 0;
603 if (n) {
604 ICMP6STAT_INC(icp6s_reflect);
605 ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
606 icmp6_reflect(n, noff);
607 }
608 break;
609
610 case ICMP6_ECHO_REPLY:
611 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
612 if (code != 0)
613 goto badcode;
614 break;
615
616 case MLD_LISTENER_QUERY:
617 case MLD_LISTENER_REPORT:
| 447 * calculate the checksum
448 */
449#ifndef PULLDOWN_TEST
450 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
451#else
452 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
453 if (icmp6 == NULL) {
454 ICMP6STAT_INC(icp6s_tooshort);
455 return IPPROTO_DONE;
456 }
457#endif
458 code = icmp6->icmp6_code;
459
460 if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
461 nd6log((LOG_ERR,
462 "ICMP6 checksum error(%d|%x) %s\n",
463 icmp6->icmp6_type, sum,
464 ip6_sprintf(ip6bufs, &ip6->ip6_src)));
465 ICMP6STAT_INC(icp6s_checksum);
466 goto freeit;
467 }
468
469 if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
470 /*
471 * Deliver very specific ICMP6 type only.
472 * This is important to deliver TOOBIG. Otherwise PMTUD
473 * will not work.
474 */
475 switch (icmp6->icmp6_type) {
476 case ICMP6_DST_UNREACH:
477 case ICMP6_PACKET_TOO_BIG:
478 case ICMP6_TIME_EXCEEDED:
479 break;
480 default:
481 goto freeit;
482 }
483 }
484
485 ICMP6STAT_INC(icp6s_inhist[icmp6->icmp6_type]);
486 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
487 if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
488 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
489
490 switch (icmp6->icmp6_type) {
491 case ICMP6_DST_UNREACH:
492 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
493 switch (code) {
494 case ICMP6_DST_UNREACH_NOROUTE:
495 code = PRC_UNREACH_NET;
496 break;
497 case ICMP6_DST_UNREACH_ADMIN:
498 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
499 code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
500 break;
501 case ICMP6_DST_UNREACH_ADDR:
502 code = PRC_HOSTDEAD;
503 break;
504 case ICMP6_DST_UNREACH_BEYONDSCOPE:
505 /* I mean "source address was incorrect." */
506 code = PRC_PARAMPROB;
507 break;
508 case ICMP6_DST_UNREACH_NOPORT:
509 code = PRC_UNREACH_PORT;
510 break;
511 default:
512 goto badcode;
513 }
514 goto deliver;
515 break;
516
517 case ICMP6_PACKET_TOO_BIG:
518 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
519
520 /* validation is made in icmp6_mtudisc_update */
521
522 code = PRC_MSGSIZE;
523
524 /*
525 * Updating the path MTU will be done after examining
526 * intermediate extension headers.
527 */
528 goto deliver;
529 break;
530
531 case ICMP6_TIME_EXCEEDED:
532 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
533 switch (code) {
534 case ICMP6_TIME_EXCEED_TRANSIT:
535 code = PRC_TIMXCEED_INTRANS;
536 break;
537 case ICMP6_TIME_EXCEED_REASSEMBLY:
538 code = PRC_TIMXCEED_REASS;
539 break;
540 default:
541 goto badcode;
542 }
543 goto deliver;
544 break;
545
546 case ICMP6_PARAM_PROB:
547 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
548 switch (code) {
549 case ICMP6_PARAMPROB_NEXTHEADER:
550 code = PRC_UNREACH_PROTOCOL;
551 break;
552 case ICMP6_PARAMPROB_HEADER:
553 case ICMP6_PARAMPROB_OPTION:
554 code = PRC_PARAMPROB;
555 break;
556 default:
557 goto badcode;
558 }
559 goto deliver;
560 break;
561
562 case ICMP6_ECHO_REQUEST:
563 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
564 if (code != 0)
565 goto badcode;
566 if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
567 /* Give up remote */
568 break;
569 }
570 if ((n->m_flags & M_EXT) != 0
571 || n->m_len < off + sizeof(struct icmp6_hdr)) {
572 struct mbuf *n0 = n;
573 const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
574 int n0len;
575
576 MGETHDR(n, M_DONTWAIT, n0->m_type);
577 n0len = n0->m_pkthdr.len; /* save for use below */
578 if (n)
579 M_MOVE_PKTHDR(n, n0);
580 if (n && maxlen >= MHLEN) {
581 MCLGET(n, M_DONTWAIT);
582 if ((n->m_flags & M_EXT) == 0) {
583 m_free(n);
584 n = NULL;
585 }
586 }
587 if (n == NULL) {
588 /* Give up remote */
589 m_freem(n0);
590 break;
591 }
592 /*
593 * Copy IPv6 and ICMPv6 only.
594 */
595 nip6 = mtod(n, struct ip6_hdr *);
596 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
597 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
598 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
599 noff = sizeof(struct ip6_hdr);
600 /* new mbuf contains only ipv6+icmpv6 headers */
601 n->m_len = noff + sizeof(struct icmp6_hdr);
602 /*
603 * Adjust mbuf. ip6_plen will be adjusted in
604 * ip6_output().
605 */
606 m_adj(n0, off + sizeof(struct icmp6_hdr));
607 /* recalculate complete packet size */
608 n->m_pkthdr.len = n0len + (noff - off);
609 n->m_next = n0;
610 } else {
611 nip6 = mtod(n, struct ip6_hdr *);
612 IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
613 sizeof(*nicmp6));
614 noff = off;
615 }
616 nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
617 nicmp6->icmp6_code = 0;
618 if (n) {
619 ICMP6STAT_INC(icp6s_reflect);
620 ICMP6STAT_INC(icp6s_outhist[ICMP6_ECHO_REPLY]);
621 icmp6_reflect(n, noff);
622 }
623 break;
624
625 case ICMP6_ECHO_REPLY:
626 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
627 if (code != 0)
628 goto badcode;
629 break;
630
631 case MLD_LISTENER_QUERY:
632 case MLD_LISTENER_REPORT:
|
618 if (icmp6len < sizeof(struct mld_hdr))
619 goto badlen;
620 if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
621 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
622 else
623 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
624 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
625 /* give up local */
626 mld6_input(m, off);
627 m = NULL;
| 633 case MLD_LISTENER_DONE:
634 case MLDV2_LISTENER_REPORT:
635 /*
636 * Drop MLD traffic which is not link-local.
637 * XXX Should we also sanity check that these messages
638 * were directed to a link-local multicast prefix?
639 */
640 if (ip6->ip6_hlim != 1)
|
628 goto freeit;
| 641 goto freeit;
|
629 }
630 mld6_input(n, off);
| 642 if (mld_input(m, off, icmp6len) != 0)
643 return (IPPROTO_DONE);
|
631 /* m stays. */
632 break;
633
| 644 /* m stays. */
645 break;
646
|
634 case MLD_LISTENER_DONE:
635 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
636 if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
637 goto badlen;
638 break; /* nothing to be done in kernel */
639
640 case MLD_MTRACE_RESP:
641 case MLD_MTRACE:
642 /* XXX: these two are experimental. not officially defined. */
643 /* XXX: per-interface statistics? */
644 break; /* just pass it to applications */
645
| |
646 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
647 {
648 enum { WRU, FQDN } mode;
649
650 if (!V_icmp6_nodeinfo)
651 break;
652
653 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
654 mode = WRU;
655 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
656 mode = FQDN;
657 else
658 goto badlen;
659
660#define hostnamelen strlen(V_hostname)
661 if (mode == FQDN) {
662#ifndef PULLDOWN_TEST
663 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
664 IPPROTO_DONE);
665#endif
666 n = m_copy(m, 0, M_COPYALL);
667 if (n)
668 n = ni6_input(n, off);
669 /* XXX meaningless if n == NULL */
670 noff = sizeof(struct ip6_hdr);
671 } else {
672 u_char *p;
673 int maxlen, maxhlen;
674
675 /*
676 * XXX: this combination of flags is pointless,
677 * but should we keep this for compatibility?
678 */
679 if ((V_icmp6_nodeinfo & 5) != 5)
680 break;
681
682 if (code != 0)
683 goto badcode;
684 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
685 if (maxlen >= MCLBYTES) {
686 /* Give up remote */
687 break;
688 }
689 MGETHDR(n, M_DONTWAIT, m->m_type);
690 if (n && maxlen > MHLEN) {
691 MCLGET(n, M_DONTWAIT);
692 if ((n->m_flags & M_EXT) == 0) {
693 m_free(n);
694 n = NULL;
695 }
696 }
697 if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) {
698 /*
699 * Previous code did a blind M_COPY_PKTHDR
700 * and said "just for rcvif". If true, then
701 * we could tolerate the dup failing (due to
702 * the deep copy of the tag chain). For now
703 * be conservative and just fail.
704 */
705 m_free(n);
706 n = NULL;
707 }
708 if (n == NULL) {
709 /* Give up remote */
710 break;
711 }
712 n->m_pkthdr.rcvif = NULL;
713 n->m_len = 0;
714 maxhlen = M_TRAILINGSPACE(n) - maxlen;
715 mtx_lock(&hostname_mtx);
716 if (maxhlen > hostnamelen)
717 maxhlen = hostnamelen;
718 /*
719 * Copy IPv6 and ICMPv6 only.
720 */
721 nip6 = mtod(n, struct ip6_hdr *);
722 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
723 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
724 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
725 p = (u_char *)(nicmp6 + 1);
726 bzero(p, 4);
727 bcopy(V_hostname, p + 4, maxhlen); /* meaningless TTL */
728 mtx_unlock(&hostname_mtx);
729 noff = sizeof(struct ip6_hdr);
730 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
731 sizeof(struct icmp6_hdr) + 4 + maxhlen;
732 nicmp6->icmp6_type = ICMP6_WRUREPLY;
733 nicmp6->icmp6_code = 0;
734 }
735#undef hostnamelen
736 if (n) {
737 ICMP6STAT_INC(icp6s_reflect);
738 ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
739 icmp6_reflect(n, noff);
740 }
741 break;
742 }
743
744 case ICMP6_WRUREPLY:
745 if (code != 0)
746 goto badcode;
747 break;
748
749 case ND_ROUTER_SOLICIT:
750 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
751 if (code != 0)
752 goto badcode;
753 if (icmp6len < sizeof(struct nd_router_solicit))
754 goto badlen;
755 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
756 /* give up local */
757 nd6_rs_input(m, off, icmp6len);
758 m = NULL;
759 goto freeit;
760 }
761 nd6_rs_input(n, off, icmp6len);
762 /* m stays. */
763 break;
764
765 case ND_ROUTER_ADVERT:
766 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
767 if (code != 0)
768 goto badcode;
769 if (icmp6len < sizeof(struct nd_router_advert))
770 goto badlen;
771 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
772 /* give up local */
773 nd6_ra_input(m, off, icmp6len);
774 m = NULL;
775 goto freeit;
776 }
777 nd6_ra_input(n, off, icmp6len);
778 /* m stays. */
779 break;
780
781 case ND_NEIGHBOR_SOLICIT:
782 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
783 if (code != 0)
784 goto badcode;
785 if (icmp6len < sizeof(struct nd_neighbor_solicit))
786 goto badlen;
787 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
788 /* give up local */
789 nd6_ns_input(m, off, icmp6len);
790 m = NULL;
791 goto freeit;
792 }
793 nd6_ns_input(n, off, icmp6len);
794 /* m stays. */
795 break;
796
797 case ND_NEIGHBOR_ADVERT:
798 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
799 if (code != 0)
800 goto badcode;
801 if (icmp6len < sizeof(struct nd_neighbor_advert))
802 goto badlen;
803 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
804 /* give up local */
805 nd6_na_input(m, off, icmp6len);
806 m = NULL;
807 goto freeit;
808 }
809 nd6_na_input(n, off, icmp6len);
810 /* m stays. */
811 break;
812
813 case ND_REDIRECT:
814 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
815 if (code != 0)
816 goto badcode;
817 if (icmp6len < sizeof(struct nd_redirect))
818 goto badlen;
819 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
820 /* give up local */
821 icmp6_redirect_input(m, off);
822 m = NULL;
823 goto freeit;
824 }
825 icmp6_redirect_input(n, off);
826 /* m stays. */
827 break;
828
829 case ICMP6_ROUTER_RENUMBERING:
830 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
831 code != ICMP6_ROUTER_RENUMBERING_RESULT)
832 goto badcode;
833 if (icmp6len < sizeof(struct icmp6_router_renum))
834 goto badlen;
835 break;
836
837 default:
838 nd6log((LOG_DEBUG,
839 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
840 icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
841 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
842 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
843 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
844 /* ICMPv6 error: MUST deliver it by spec... */
845 code = PRC_NCMDS;
846 /* deliver */
847 } else {
848 /* ICMPv6 informational: MUST not deliver */
849 break;
850 }
851 deliver:
852 if (icmp6_notify_error(&m, off, icmp6len, code)) {
853 /* In this case, m should've been freed. */
854 return (IPPROTO_DONE);
855 }
856 break;
857
858 badcode:
859 ICMP6STAT_INC(icp6s_badcode);
860 break;
861
862 badlen:
863 ICMP6STAT_INC(icp6s_badlen);
864 break;
865 }
866
867 /* deliver the packet to appropriate sockets */
868 icmp6_rip6_input(&m, *offp);
869
870 return IPPROTO_DONE;
871
872 freeit:
873 m_freem(m);
874 return IPPROTO_DONE;
875}
876
877static int
878icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
879{
880 INIT_VNET_INET6(curvnet);
881 struct mbuf *m = *mp;
882 struct icmp6_hdr *icmp6;
883 struct ip6_hdr *eip6;
884 u_int32_t notifymtu;
885 struct sockaddr_in6 icmp6src, icmp6dst;
886
887 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
888 ICMP6STAT_INC(icp6s_tooshort);
889 goto freeit;
890 }
891#ifndef PULLDOWN_TEST
892 IP6_EXTHDR_CHECK(m, off,
893 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
894 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
895#else
896 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
897 sizeof(*icmp6) + sizeof(struct ip6_hdr));
898 if (icmp6 == NULL) {
899 ICMP6STAT_INC(icp6s_tooshort);
900 return (-1);
901 }
902#endif
903 eip6 = (struct ip6_hdr *)(icmp6 + 1);
904
905 /* Detect the upper level protocol */
906 {
907 void (*ctlfunc)(int, struct sockaddr *, void *);
908 u_int8_t nxt = eip6->ip6_nxt;
909 int eoff = off + sizeof(struct icmp6_hdr) +
910 sizeof(struct ip6_hdr);
911 struct ip6ctlparam ip6cp;
912 struct in6_addr *finaldst = NULL;
913 int icmp6type = icmp6->icmp6_type;
914 struct ip6_frag *fh;
915 struct ip6_rthdr *rth;
916 struct ip6_rthdr0 *rth0;
917 int rthlen;
918
919 while (1) { /* XXX: should avoid infinite loop explicitly? */
920 struct ip6_ext *eh;
921
922 switch (nxt) {
923 case IPPROTO_HOPOPTS:
924 case IPPROTO_DSTOPTS:
925 case IPPROTO_AH:
926#ifndef PULLDOWN_TEST
927 IP6_EXTHDR_CHECK(m, 0,
928 eoff + sizeof(struct ip6_ext), -1);
929 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
930#else
931 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
932 eoff, sizeof(*eh));
933 if (eh == NULL) {
934 ICMP6STAT_INC(icp6s_tooshort);
935 return (-1);
936 }
937#endif
938
939 if (nxt == IPPROTO_AH)
940 eoff += (eh->ip6e_len + 2) << 2;
941 else
942 eoff += (eh->ip6e_len + 1) << 3;
943 nxt = eh->ip6e_nxt;
944 break;
945 case IPPROTO_ROUTING:
946 /*
947 * When the erroneous packet contains a
948 * routing header, we should examine the
949 * header to determine the final destination.
950 * Otherwise, we can't properly update
951 * information that depends on the final
952 * destination (e.g. path MTU).
953 */
954#ifndef PULLDOWN_TEST
955 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
956 rth = (struct ip6_rthdr *)
957 (mtod(m, caddr_t) + eoff);
958#else
959 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
960 eoff, sizeof(*rth));
961 if (rth == NULL) {
962 ICMP6STAT_INC(icp6s_tooshort);
963 return (-1);
964 }
965#endif
966 rthlen = (rth->ip6r_len + 1) << 3;
967 /*
968 * XXX: currently there is no
969 * officially defined type other
970 * than type-0.
971 * Note that if the segment left field
972 * is 0, all intermediate hops must
973 * have been passed.
974 */
975 if (rth->ip6r_segleft &&
976 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
977 int hops;
978
979#ifndef PULLDOWN_TEST
980 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
981 rth0 = (struct ip6_rthdr0 *)
982 (mtod(m, caddr_t) + eoff);
983#else
984 IP6_EXTHDR_GET(rth0,
985 struct ip6_rthdr0 *, m,
986 eoff, rthlen);
987 if (rth0 == NULL) {
988 ICMP6STAT_INC(icp6s_tooshort);
989 return (-1);
990 }
991#endif
992 /* just ignore a bogus header */
993 if ((rth0->ip6r0_len % 2) == 0 &&
994 (hops = rth0->ip6r0_len/2))
995 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
996 }
997 eoff += rthlen;
998 nxt = rth->ip6r_nxt;
999 break;
1000 case IPPROTO_FRAGMENT:
1001#ifndef PULLDOWN_TEST
1002 IP6_EXTHDR_CHECK(m, 0, eoff +
1003 sizeof(struct ip6_frag), -1);
1004 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
1005 eoff);
1006#else
1007 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1008 eoff, sizeof(*fh));
1009 if (fh == NULL) {
1010 ICMP6STAT_INC(icp6s_tooshort);
1011 return (-1);
1012 }
1013#endif
1014 /*
1015 * Data after a fragment header is meaningless
1016 * unless it is the first fragment, but
1017 * we'll go to the notify label for path MTU
1018 * discovery.
1019 */
1020 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1021 goto notify;
1022
1023 eoff += sizeof(struct ip6_frag);
1024 nxt = fh->ip6f_nxt;
1025 break;
1026 default:
1027 /*
1028 * This case includes ESP and the No Next
1029 * Header. In such cases going to the notify
1030 * label does not have any meaning
1031 * (i.e. ctlfunc will be NULL), but we go
1032 * anyway since we might have to update
1033 * path MTU information.
1034 */
1035 goto notify;
1036 }
1037 }
1038 notify:
1039#ifndef PULLDOWN_TEST
1040 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1041#else
1042 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1043 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1044 if (icmp6 == NULL) {
1045 ICMP6STAT_INC(icp6s_tooshort);
1046 return (-1);
1047 }
1048#endif
1049
1050 /*
1051 * retrieve parameters from the inner IPv6 header, and convert
1052 * them into sockaddr structures.
1053 * XXX: there is no guarantee that the source or destination
1054 * addresses of the inner packet are in the same scope as
1055 * the addresses of the icmp packet. But there is no other
1056 * way to determine the zone.
1057 */
1058 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1059
1060 bzero(&icmp6dst, sizeof(icmp6dst));
1061 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1062 icmp6dst.sin6_family = AF_INET6;
1063 if (finaldst == NULL)
1064 icmp6dst.sin6_addr = eip6->ip6_dst;
1065 else
1066 icmp6dst.sin6_addr = *finaldst;
1067 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1068 goto freeit;
1069 bzero(&icmp6src, sizeof(icmp6src));
1070 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1071 icmp6src.sin6_family = AF_INET6;
1072 icmp6src.sin6_addr = eip6->ip6_src;
1073 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1074 goto freeit;
1075 icmp6src.sin6_flowinfo =
1076 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1077
1078 if (finaldst == NULL)
1079 finaldst = &eip6->ip6_dst;
1080 ip6cp.ip6c_m = m;
1081 ip6cp.ip6c_icmp6 = icmp6;
1082 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1083 ip6cp.ip6c_off = eoff;
1084 ip6cp.ip6c_finaldst = finaldst;
1085 ip6cp.ip6c_src = &icmp6src;
1086 ip6cp.ip6c_nxt = nxt;
1087
1088 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1089 notifymtu = ntohl(icmp6->icmp6_mtu);
1090 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1091 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1092 }
1093
1094 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1095 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1096 if (ctlfunc) {
1097 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1098 &ip6cp);
1099 }
1100 }
1101 *mp = m;
1102 return (0);
1103
1104 freeit:
1105 m_freem(m);
1106 return (-1);
1107}
1108
1109void
1110icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1111{
1112 INIT_VNET_INET6(curvnet);
1113 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1114 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1115 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1116 u_int mtu = ntohl(icmp6->icmp6_mtu);
1117 struct in_conninfo inc;
1118
1119#if 0
1120 /*
1121 * RFC2460 section 5, last paragraph.
1122 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1123 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1124 * due to packet translator in the middle.
1125 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1126 * special handling.
1127 */
1128 if (mtu < IPV6_MMTU)
1129 return;
1130#endif
1131
1132 /*
1133 * we reject ICMPv6 too big with abnormally small value.
1134 * XXX what is the good definition of "abnormally small"?
1135 */
1136 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1137 return;
1138
1139 if (!validated)
1140 return;
1141
1142 /*
1143 * In case the suggested mtu is less than IPV6_MMTU, we
1144 * only need to remember that it was for above mentioned
1145 * "alwaysfrag" case.
1146 * Try to be as close to the spec as possible.
1147 */
1148 if (mtu < IPV6_MMTU)
1149 mtu = IPV6_MMTU - 8;
1150
1151 bzero(&inc, sizeof(inc));
1152 inc.inc_flags |= INC_ISIPV6;
1153 inc.inc6_faddr = *dst;
1154 if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1155 return;
1156
1157 if (mtu < tcp_maxmtu6(&inc, NULL)) {
1158 tcp_hc_updatemtu(&inc, mtu);
1159 ICMP6STAT_INC(icp6s_pmtuchg);
1160 }
1161}
1162
1163/*
1164 * Process a Node Information Query packet, based on
1165 * draft-ietf-ipngwg-icmp-name-lookups-07.
1166 *
1167 * Spec incompatibilities:
1168 * - IPv6 Subject address handling
1169 * - IPv4 Subject address handling support missing
1170 * - Proxy reply (answer even if it's not for me)
1171 * - joins NI group address at in6_ifattach() time only, does not cope
1172 * with hostname changes by sethostname(3)
1173 */
1174#define hostnamelen strlen(V_hostname)
1175static struct mbuf *
1176ni6_input(struct mbuf *m, int off)
1177{
1178 INIT_VNET_INET6(curvnet);
1179 INIT_VPROCG(TD_TO_VPROCG(curthread)); /* XXX V_hostname needs this */
1180 struct icmp6_nodeinfo *ni6, *nni6;
1181 struct mbuf *n = NULL;
1182 u_int16_t qtype;
1183 int subjlen;
1184 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1185 struct ni_reply_fqdn *fqdn;
1186 int addrs; /* for NI_QTYPE_NODEADDR */
1187 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1188 struct in6_addr in6_subj; /* subject address */
1189 struct ip6_hdr *ip6;
1190 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1191 char *subj = NULL;
1192 struct in6_ifaddr *ia6 = NULL;
1193
1194 ip6 = mtod(m, struct ip6_hdr *);
1195#ifndef PULLDOWN_TEST
1196 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1197#else
1198 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1199 if (ni6 == NULL) {
1200 /* m is already reclaimed */
1201 return (NULL);
1202 }
1203#endif
1204
1205 /*
1206 * Validate IPv6 source address.
1207 * The default configuration MUST be to refuse answering queries from
1208 * global-scope addresses according to RFC4602.
1209 * Notes:
1210 * - it's not very clear what "refuse" means; this implementation
1211 * simply drops it.
1212 * - it's not very easy to identify global-scope (unicast) addresses
1213 * since there are many prefixes for them. It should be safer
1214 * and in practice sufficient to check "all" but loopback and
1215 * link-local (note that site-local unicast was deprecated and
1216 * ULA is defined as global scope-wise)
1217 */
1218 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1219 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1220 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1221 goto bad;
1222
1223 /*
1224 * Validate IPv6 destination address.
1225 *
1226 * The Responder must discard the Query without further processing
1227 * unless it is one of the Responder's unicast or anycast addresses, or
1228 * a link-local scope multicast address which the Responder has joined.
1229 * [RFC4602, Section 5.]
1230 */
1231 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1232 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1233 goto bad;
1234 /* else it's a link-local multicast, fine */
1235 } else { /* unicast or anycast */
1236 if ((ia6 = ip6_getdstifaddr(m)) == NULL)
1237 goto bad; /* XXX impossible */
1238
1239 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1240 !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1241 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1242 "a temporary address in %s:%d",
1243 __FILE__, __LINE__));
1244 goto bad;
1245 }
1246 }
1247
1248 /* validate query Subject field. */
1249 qtype = ntohs(ni6->ni_qtype);
1250 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1251 switch (qtype) {
1252 case NI_QTYPE_NOOP:
1253 case NI_QTYPE_SUPTYPES:
1254 /* 07 draft */
1255 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1256 break;
1257 /* FALLTHROUGH */
1258 case NI_QTYPE_FQDN:
1259 case NI_QTYPE_NODEADDR:
1260 case NI_QTYPE_IPV4ADDR:
1261 switch (ni6->ni_code) {
1262 case ICMP6_NI_SUBJ_IPV6:
1263#if ICMP6_NI_SUBJ_IPV6 != 0
1264 case 0:
1265#endif
1266 /*
1267 * backward compatibility - try to accept 03 draft
1268 * format, where no Subject is present.
1269 */
1270 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1271 subjlen == 0) {
1272 oldfqdn++;
1273 break;
1274 }
1275#if ICMP6_NI_SUBJ_IPV6 != 0
1276 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1277 goto bad;
1278#endif
1279
1280 if (subjlen != sizeof(struct in6_addr))
1281 goto bad;
1282
1283 /*
1284 * Validate Subject address.
1285 *
1286 * Not sure what exactly "address belongs to the node"
1287 * means in the spec, is it just unicast, or what?
1288 *
1289 * At this moment we consider Subject address as
1290 * "belong to the node" if the Subject address equals
1291 * to the IPv6 destination address; validation for
1292 * IPv6 destination address should have done enough
1293 * check for us.
1294 *
1295 * We do not do proxy at this moment.
1296 */
1297 /* m_pulldown instead of copy? */
1298 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1299 subjlen, (caddr_t)&in6_subj);
1300 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
1301 goto bad;
1302
1303 subj = (char *)&in6_subj;
1304 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1305 break;
1306
1307 /*
1308 * XXX if we are to allow other cases, we should really
1309 * be careful about scope here.
1310 * basically, we should disallow queries toward IPv6
1311 * destination X with subject Y,
1312 * if scope(X) > scope(Y).
1313 * if we allow scope(X) > scope(Y), it will result in
1314 * information leakage across scope boundary.
1315 */
1316 goto bad;
1317
1318 case ICMP6_NI_SUBJ_FQDN:
1319 /*
1320 * Validate Subject name with gethostname(3).
1321 *
1322 * The behavior may need some debate, since:
1323 * - we are not sure if the node has FQDN as
1324 * hostname (returned by gethostname(3)).
1325 * - the code does wildcard match for truncated names.
1326 * however, we are not sure if we want to perform
1327 * wildcard match, if gethostname(3) side has
1328 * truncated hostname.
1329 */
1330 mtx_lock(&hostname_mtx);
1331 n = ni6_nametodns(V_hostname, hostnamelen, 0);
1332 mtx_unlock(&hostname_mtx);
1333 if (!n || n->m_next || n->m_len == 0)
1334 goto bad;
1335 IP6_EXTHDR_GET(subj, char *, m,
1336 off + sizeof(struct icmp6_nodeinfo), subjlen);
1337 if (subj == NULL)
1338 goto bad;
1339 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1340 n->m_len)) {
1341 goto bad;
1342 }
1343 m_freem(n);
1344 n = NULL;
1345 break;
1346
1347 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1348 default:
1349 goto bad;
1350 }
1351 break;
1352 }
1353
1354 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1355 switch (qtype) {
1356 case NI_QTYPE_FQDN:
1357 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1358 goto bad;
1359 break;
1360 case NI_QTYPE_NODEADDR:
1361 case NI_QTYPE_IPV4ADDR:
1362 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1363 goto bad;
1364 break;
1365 }
1366
1367 /* guess reply length */
1368 switch (qtype) {
1369 case NI_QTYPE_NOOP:
1370 break; /* no reply data */
1371 case NI_QTYPE_SUPTYPES:
1372 replylen += sizeof(u_int32_t);
1373 break;
1374 case NI_QTYPE_FQDN:
1375 /* XXX will append an mbuf */
1376 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1377 break;
1378 case NI_QTYPE_NODEADDR:
1379 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
1380 if ((replylen += addrs * (sizeof(struct in6_addr) +
1381 sizeof(u_int32_t))) > MCLBYTES)
1382 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1383 break;
1384 case NI_QTYPE_IPV4ADDR:
1385 /* unsupported - should respond with unknown Qtype? */
1386 break;
1387 default:
1388 /*
1389 * XXX: We must return a reply with the ICMP6 code
1390 * `unknown Qtype' in this case. However we regard the case
1391 * as an FQDN query for backward compatibility.
1392 * Older versions set a random value to this field,
1393 * so it rarely varies in the defined qtypes.
1394 * But the mechanism is not reliable...
1395 * maybe we should obsolete older versions.
1396 */
1397 qtype = NI_QTYPE_FQDN;
1398 /* XXX will append an mbuf */
1399 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1400 oldfqdn++;
1401 break;
1402 }
1403
1404 /* allocate an mbuf to reply. */
1405 MGETHDR(n, M_DONTWAIT, m->m_type);
1406 if (n == NULL) {
1407 m_freem(m);
1408 return (NULL);
1409 }
1410 M_MOVE_PKTHDR(n, m); /* just for recvif */
1411 if (replylen > MHLEN) {
1412 if (replylen > MCLBYTES) {
1413 /*
1414 * XXX: should we try to allocate more? But MCLBYTES
1415 * is probably much larger than IPV6_MMTU...
1416 */
1417 goto bad;
1418 }
1419 MCLGET(n, M_DONTWAIT);
1420 if ((n->m_flags & M_EXT) == 0) {
1421 goto bad;
1422 }
1423 }
1424 n->m_pkthdr.len = n->m_len = replylen;
1425
1426 /* copy mbuf header and IPv6 + Node Information base headers */
1427 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1428 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1429 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1430
1431 /* qtype dependent procedure */
1432 switch (qtype) {
1433 case NI_QTYPE_NOOP:
1434 nni6->ni_code = ICMP6_NI_SUCCESS;
1435 nni6->ni_flags = 0;
1436 break;
1437 case NI_QTYPE_SUPTYPES:
1438 {
1439 u_int32_t v;
1440 nni6->ni_code = ICMP6_NI_SUCCESS;
1441 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1442 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1443 v = (u_int32_t)htonl(0x0000000f);
1444 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1445 break;
1446 }
1447 case NI_QTYPE_FQDN:
1448 nni6->ni_code = ICMP6_NI_SUCCESS;
1449 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1450 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1451 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1452 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1453 /*
1454 * XXX do we really have FQDN in variable "hostname"?
1455 */
1456 mtx_lock(&hostname_mtx);
1457 n->m_next = ni6_nametodns(V_hostname, hostnamelen, oldfqdn);
1458 mtx_unlock(&hostname_mtx);
1459 if (n->m_next == NULL)
1460 goto bad;
1461 /* XXX we assume that n->m_next is not a chain */
1462 if (n->m_next->m_next != NULL)
1463 goto bad;
1464 n->m_pkthdr.len += n->m_next->m_len;
1465 break;
1466 case NI_QTYPE_NODEADDR:
1467 {
1468 int lenlim, copied;
1469
1470 nni6->ni_code = ICMP6_NI_SUCCESS;
1471 n->m_pkthdr.len = n->m_len =
1472 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1473 lenlim = M_TRAILINGSPACE(n);
1474 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1475 /* XXX: reset mbuf length */
1476 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1477 sizeof(struct icmp6_nodeinfo) + copied;
1478 break;
1479 }
1480 default:
1481 break; /* XXX impossible! */
1482 }
1483
1484 nni6->ni_type = ICMP6_NI_REPLY;
1485 m_freem(m);
1486 return (n);
1487
1488 bad:
1489 m_freem(m);
1490 if (n)
1491 m_freem(n);
1492 return (NULL);
1493}
1494#undef hostnamelen
1495
1496/*
1497 * make a mbuf with DNS-encoded string. no compression support.
1498 *
1499 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1500 * treated as truncated name (two \0 at the end). this is a wild guess.
1501 *
1502 * old - return pascal string if non-zero
1503 */
1504static struct mbuf *
1505ni6_nametodns(const char *name, int namelen, int old)
1506{
1507 struct mbuf *m;
1508 char *cp, *ep;
1509 const char *p, *q;
1510 int i, len, nterm;
1511
1512 if (old)
1513 len = namelen + 1;
1514 else
1515 len = MCLBYTES;
1516
1517 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1518 MGET(m, M_DONTWAIT, MT_DATA);
1519 if (m && len > MLEN) {
1520 MCLGET(m, M_DONTWAIT);
1521 if ((m->m_flags & M_EXT) == 0)
1522 goto fail;
1523 }
1524 if (!m)
1525 goto fail;
1526 m->m_next = NULL;
1527
1528 if (old) {
1529 m->m_len = len;
1530 *mtod(m, char *) = namelen;
1531 bcopy(name, mtod(m, char *) + 1, namelen);
1532 return m;
1533 } else {
1534 m->m_len = 0;
1535 cp = mtod(m, char *);
1536 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1537
1538 /* if not certain about my name, return empty buffer */
1539 if (namelen == 0)
1540 return m;
1541
1542 /*
1543 * guess if it looks like shortened hostname, or FQDN.
1544 * shortened hostname needs two trailing "\0".
1545 */
1546 i = 0;
1547 for (p = name; p < name + namelen; p++) {
1548 if (*p && *p == '.')
1549 i++;
1550 }
1551 if (i < 2)
1552 nterm = 2;
1553 else
1554 nterm = 1;
1555
1556 p = name;
1557 while (cp < ep && p < name + namelen) {
1558 i = 0;
1559 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1560 i++;
1561 /* result does not fit into mbuf */
1562 if (cp + i + 1 >= ep)
1563 goto fail;
1564 /*
1565 * DNS label length restriction, RFC1035 page 8.
1566 * "i == 0" case is included here to avoid returning
1567 * 0-length label on "foo..bar".
1568 */
1569 if (i <= 0 || i >= 64)
1570 goto fail;
1571 *cp++ = i;
1572 bcopy(p, cp, i);
1573 cp += i;
1574 p = q;
1575 if (p < name + namelen && *p == '.')
1576 p++;
1577 }
1578 /* termination */
1579 if (cp + nterm >= ep)
1580 goto fail;
1581 while (nterm-- > 0)
1582 *cp++ = '\0';
1583 m->m_len = cp - mtod(m, char *);
1584 return m;
1585 }
1586
1587 panic("should not reach here");
1588 /* NOTREACHED */
1589
1590 fail:
1591 if (m)
1592 m_freem(m);
1593 return NULL;
1594}
1595
1596/*
1597 * check if two DNS-encoded string matches. takes care of truncated
1598 * form (with \0\0 at the end). no compression support.
1599 * XXX upper/lowercase match (see RFC2065)
1600 */
1601static int
1602ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1603{
1604 const char *a0, *b0;
1605 int l;
1606
1607 /* simplest case - need validation? */
1608 if (alen == blen && bcmp(a, b, alen) == 0)
1609 return 1;
1610
1611 a0 = a;
1612 b0 = b;
1613
1614 /* termination is mandatory */
1615 if (alen < 2 || blen < 2)
1616 return 0;
1617 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1618 return 0;
1619 alen--;
1620 blen--;
1621
1622 while (a - a0 < alen && b - b0 < blen) {
1623 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1624 return 0;
1625
1626 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1627 return 0;
1628 /* we don't support compression yet */
1629 if (a[0] >= 64 || b[0] >= 64)
1630 return 0;
1631
1632 /* truncated case */
1633 if (a[0] == 0 && a - a0 == alen - 1)
1634 return 1;
1635 if (b[0] == 0 && b - b0 == blen - 1)
1636 return 1;
1637 if (a[0] == 0 || b[0] == 0)
1638 return 0;
1639
1640 if (a[0] != b[0])
1641 return 0;
1642 l = a[0];
1643 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1644 return 0;
1645 if (bcmp(a + 1, b + 1, l) != 0)
1646 return 0;
1647
1648 a += 1 + l;
1649 b += 1 + l;
1650 }
1651
1652 if (a - a0 == alen && b - b0 == blen)
1653 return 1;
1654 else
1655 return 0;
1656}
1657
1658/*
1659 * calculate the number of addresses to be returned in the node info reply.
1660 */
1661static int
1662ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1663 struct in6_addr *subj)
1664{
1665 INIT_VNET_NET(curvnet);
1666 INIT_VNET_INET6(curvnet);
1667 struct ifnet *ifp;
1668 struct in6_ifaddr *ifa6;
1669 struct ifaddr *ifa;
1670 int addrs = 0, addrsofif, iffound = 0;
1671 int niflags = ni6->ni_flags;
1672
1673 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1674 switch (ni6->ni_code) {
1675 case ICMP6_NI_SUBJ_IPV6:
1676 if (subj == NULL) /* must be impossible... */
1677 return (0);
1678 break;
1679 default:
1680 /*
1681 * XXX: we only support IPv6 subject address for
1682 * this Qtype.
1683 */
1684 return (0);
1685 }
1686 }
1687
1688 IFNET_RLOCK();
1689 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1690 addrsofif = 0;
1691 IF_ADDR_LOCK(ifp);
1692 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1693 if (ifa->ifa_addr->sa_family != AF_INET6)
1694 continue;
1695 ifa6 = (struct in6_ifaddr *)ifa;
1696
1697 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1698 IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
1699 iffound = 1;
1700
1701 /*
1702 * IPv4-mapped addresses can only be returned by a
1703 * Node Information proxy, since they represent
1704 * addresses of IPv4-only nodes, which perforce do
1705 * not implement this protocol.
1706 * [icmp-name-lookups-07, Section 5.4]
1707 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1708 * this function at this moment.
1709 */
1710
1711 /* What do we have to do about ::1? */
1712 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1713 case IPV6_ADDR_SCOPE_LINKLOCAL:
1714 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1715 continue;
1716 break;
1717 case IPV6_ADDR_SCOPE_SITELOCAL:
1718 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1719 continue;
1720 break;
1721 case IPV6_ADDR_SCOPE_GLOBAL:
1722 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1723 continue;
1724 break;
1725 default:
1726 continue;
1727 }
1728
1729 /*
1730 * check if anycast is okay.
1731 * XXX: just experimental. not in the spec.
1732 */
1733 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1734 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1735 continue; /* we need only unicast addresses */
1736 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1737 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1738 continue;
1739 }
1740 addrsofif++; /* count the address */
1741 }
1742 IF_ADDR_UNLOCK(ifp);
1743 if (iffound) {
1744 *ifpp = ifp;
1745 IFNET_RUNLOCK();
1746 return (addrsofif);
1747 }
1748
1749 addrs += addrsofif;
1750 }
1751 IFNET_RUNLOCK();
1752
1753 return (addrs);
1754}
1755
1756static int
1757ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1758 struct ifnet *ifp0, int resid)
1759{
1760 INIT_VNET_NET(curvnet);
1761 INIT_VNET_INET6(curvnet);
1762 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet);
1763 struct in6_ifaddr *ifa6;
1764 struct ifaddr *ifa;
1765 struct ifnet *ifp_dep = NULL;
1766 int copied = 0, allow_deprecated = 0;
1767 u_char *cp = (u_char *)(nni6 + 1);
1768 int niflags = ni6->ni_flags;
1769 u_int32_t ltime;
1770
1771 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1772 return (0); /* needless to copy */
1773
1774 IFNET_RLOCK();
1775 again:
1776
1777 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1778 IF_ADDR_LOCK(ifp);
1779 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1780 if (ifa->ifa_addr->sa_family != AF_INET6)
1781 continue;
1782 ifa6 = (struct in6_ifaddr *)ifa;
1783
1784 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1785 allow_deprecated == 0) {
1786 /*
1787 * prefererred address should be put before
1788 * deprecated addresses.
1789 */
1790
1791 /* record the interface for later search */
1792 if (ifp_dep == NULL)
1793 ifp_dep = ifp;
1794
1795 continue;
1796 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1797 allow_deprecated != 0)
1798 continue; /* we now collect deprecated addrs */
1799
1800 /* What do we have to do about ::1? */
1801 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1802 case IPV6_ADDR_SCOPE_LINKLOCAL:
1803 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1804 continue;
1805 break;
1806 case IPV6_ADDR_SCOPE_SITELOCAL:
1807 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1808 continue;
1809 break;
1810 case IPV6_ADDR_SCOPE_GLOBAL:
1811 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1812 continue;
1813 break;
1814 default:
1815 continue;
1816 }
1817
1818 /*
1819 * check if anycast is okay.
1820 * XXX: just experimental. not in the spec.
1821 */
1822 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1823 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1824 continue;
1825 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1826 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1827 continue;
1828 }
1829
1830 /* now we can copy the address */
1831 if (resid < sizeof(struct in6_addr) +
1832 sizeof(u_int32_t)) {
1833 IF_ADDR_UNLOCK(ifp);
1834 /*
1835 * We give up much more copy.
1836 * Set the truncate flag and return.
1837 */
1838 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1839 IFNET_RUNLOCK();
1840 return (copied);
1841 }
1842
1843 /*
1844 * Set the TTL of the address.
1845 * The TTL value should be one of the following
1846 * according to the specification:
1847 *
1848 * 1. The remaining lifetime of a DHCP lease on the
1849 * address, or
1850 * 2. The remaining Valid Lifetime of a prefix from
1851 * which the address was derived through Stateless
1852 * Autoconfiguration.
1853 *
1854 * Note that we currently do not support stateful
1855 * address configuration by DHCPv6, so the former
1856 * case can't happen.
1857 */
1858 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1859 ltime = ND6_INFINITE_LIFETIME;
1860 else {
1861 if (ifa6->ia6_lifetime.ia6t_expire >
1862 time_second)
1863 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1864 else
1865 ltime = 0;
1866 }
1867
1868 bcopy(<ime, cp, sizeof(u_int32_t));
1869 cp += sizeof(u_int32_t);
1870
1871 /* copy the address itself */
1872 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1873 sizeof(struct in6_addr));
1874 in6_clearscope((struct in6_addr *)cp); /* XXX */
1875 cp += sizeof(struct in6_addr);
1876
1877 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1878 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1879 }
1880 IF_ADDR_UNLOCK(ifp);
1881 if (ifp0) /* we need search only on the specified IF */
1882 break;
1883 }
1884
1885 if (allow_deprecated == 0 && ifp_dep != NULL) {
1886 ifp = ifp_dep;
1887 allow_deprecated = 1;
1888
1889 goto again;
1890 }
1891
1892 IFNET_RUNLOCK();
1893
1894 return (copied);
1895}
1896
1897/*
1898 * XXX almost dup'ed code with rip6_input.
1899 */
1900static int
1901icmp6_rip6_input(struct mbuf **mp, int off)
1902{
1903 INIT_VNET_INET(curvnet);
1904 INIT_VNET_INET6(curvnet);
1905 struct mbuf *m = *mp;
1906 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1907 struct inpcb *in6p;
1908 struct inpcb *last = NULL;
1909 struct sockaddr_in6 fromsa;
1910 struct icmp6_hdr *icmp6;
1911 struct mbuf *opts = NULL;
1912
1913#ifndef PULLDOWN_TEST
1914 /* this is assumed to be safe. */
1915 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1916#else
1917 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1918 if (icmp6 == NULL) {
1919 /* m is already reclaimed */
1920 return (IPPROTO_DONE);
1921 }
1922#endif
1923
1924 /*
1925 * XXX: the address may have embedded scope zone ID, which should be
1926 * hidden from applications.
1927 */
1928 bzero(&fromsa, sizeof(fromsa));
1929 fromsa.sin6_family = AF_INET6;
1930 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1931 fromsa.sin6_addr = ip6->ip6_src;
1932 if (sa6_recoverscope(&fromsa)) {
1933 m_freem(m);
1934 return (IPPROTO_DONE);
1935 }
1936
1937 INP_INFO_RLOCK(&V_ripcbinfo);
1938 LIST_FOREACH(in6p, &V_ripcb, inp_list) {
1939 if ((in6p->inp_vflag & INP_IPV6) == 0)
1940 continue;
1941 if (in6p->inp_ip_p != IPPROTO_ICMPV6)
1942 continue;
1943 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1944 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1945 continue;
1946 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1947 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1948 continue;
1949 INP_RLOCK(in6p);
1950 if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1951 in6p->in6p_icmp6filt)) {
1952 INP_RUNLOCK(in6p);
1953 continue;
1954 }
1955 if (last != NULL) {
1956 struct mbuf *n = NULL;
1957
1958 /*
1959 * Recent network drivers tend to allocate a single
1960 * mbuf cluster, rather than to make a couple of
1961 * mbufs without clusters. Also, since the IPv6 code
1962 * path tries to avoid m_pullup(), it is highly
1963 * probable that we still have an mbuf cluster here
1964 * even though the necessary length can be stored in an
1965 * mbuf's internal buffer.
1966 * Meanwhile, the default size of the receive socket
1967 * buffer for raw sockets is not so large. This means
1968 * the possibility of packet loss is relatively higher
1969 * than before. To avoid this scenario, we copy the
1970 * received data to a separate mbuf that does not use
1971 * a cluster, if possible.
1972 * XXX: it is better to copy the data after stripping
1973 * intermediate headers.
1974 */
1975 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1976 m->m_len <= MHLEN) {
1977 MGET(n, M_DONTWAIT, m->m_type);
1978 if (n != NULL) {
1979 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1980 bcopy(m->m_data, n->m_data,
1981 m->m_len);
1982 n->m_len = m->m_len;
1983 } else {
1984 m_free(n);
1985 n = NULL;
1986 }
1987 }
1988 }
1989 if (n != NULL ||
1990 (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1991 if (last->inp_flags & INP_CONTROLOPTS)
1992 ip6_savecontrol(last, n, &opts);
1993 /* strip intermediate headers */
1994 m_adj(n, off);
1995 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
1996 if (sbappendaddr_locked(
1997 &last->inp_socket->so_rcv,
1998 (struct sockaddr *)&fromsa, n, opts)
1999 == 0) {
2000 /* should notify about lost packet */
2001 m_freem(n);
2002 if (opts) {
2003 m_freem(opts);
2004 }
2005 SOCKBUF_UNLOCK(
2006 &last->inp_socket->so_rcv);
2007 } else
2008 sorwakeup_locked(last->inp_socket);
2009 opts = NULL;
2010 }
2011 INP_RUNLOCK(last);
2012 }
2013 last = in6p;
2014 }
2015 INP_INFO_RUNLOCK(&V_ripcbinfo);
2016 if (last != NULL) {
2017 if (last->inp_flags & INP_CONTROLOPTS)
2018 ip6_savecontrol(last, m, &opts);
2019 /* strip intermediate headers */
2020 m_adj(m, off);
2021
2022 /* avoid using mbuf clusters if possible (see above) */
2023 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2024 m->m_len <= MHLEN) {
2025 struct mbuf *n;
2026
2027 MGET(n, M_DONTWAIT, m->m_type);
2028 if (n != NULL) {
2029 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2030 bcopy(m->m_data, n->m_data, m->m_len);
2031 n->m_len = m->m_len;
2032
2033 m_freem(m);
2034 m = n;
2035 } else {
2036 m_freem(n);
2037 n = NULL;
2038 }
2039 }
2040 }
2041 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2042 if (sbappendaddr_locked(&last->inp_socket->so_rcv,
2043 (struct sockaddr *)&fromsa, m, opts) == 0) {
2044 m_freem(m);
2045 if (opts)
2046 m_freem(opts);
2047 SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
2048 } else
2049 sorwakeup_locked(last->inp_socket);
2050 INP_RUNLOCK(last);
2051 } else {
2052 m_freem(m);
| 647 case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
648 {
649 enum { WRU, FQDN } mode;
650
651 if (!V_icmp6_nodeinfo)
652 break;
653
654 if (icmp6len == sizeof(struct icmp6_hdr) + 4)
655 mode = WRU;
656 else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
657 mode = FQDN;
658 else
659 goto badlen;
660
661#define hostnamelen strlen(V_hostname)
662 if (mode == FQDN) {
663#ifndef PULLDOWN_TEST
664 IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
665 IPPROTO_DONE);
666#endif
667 n = m_copy(m, 0, M_COPYALL);
668 if (n)
669 n = ni6_input(n, off);
670 /* XXX meaningless if n == NULL */
671 noff = sizeof(struct ip6_hdr);
672 } else {
673 u_char *p;
674 int maxlen, maxhlen;
675
676 /*
677 * XXX: this combination of flags is pointless,
678 * but should we keep this for compatibility?
679 */
680 if ((V_icmp6_nodeinfo & 5) != 5)
681 break;
682
683 if (code != 0)
684 goto badcode;
685 maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
686 if (maxlen >= MCLBYTES) {
687 /* Give up remote */
688 break;
689 }
690 MGETHDR(n, M_DONTWAIT, m->m_type);
691 if (n && maxlen > MHLEN) {
692 MCLGET(n, M_DONTWAIT);
693 if ((n->m_flags & M_EXT) == 0) {
694 m_free(n);
695 n = NULL;
696 }
697 }
698 if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) {
699 /*
700 * Previous code did a blind M_COPY_PKTHDR
701 * and said "just for rcvif". If true, then
702 * we could tolerate the dup failing (due to
703 * the deep copy of the tag chain). For now
704 * be conservative and just fail.
705 */
706 m_free(n);
707 n = NULL;
708 }
709 if (n == NULL) {
710 /* Give up remote */
711 break;
712 }
713 n->m_pkthdr.rcvif = NULL;
714 n->m_len = 0;
715 maxhlen = M_TRAILINGSPACE(n) - maxlen;
716 mtx_lock(&hostname_mtx);
717 if (maxhlen > hostnamelen)
718 maxhlen = hostnamelen;
719 /*
720 * Copy IPv6 and ICMPv6 only.
721 */
722 nip6 = mtod(n, struct ip6_hdr *);
723 bcopy(ip6, nip6, sizeof(struct ip6_hdr));
724 nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
725 bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
726 p = (u_char *)(nicmp6 + 1);
727 bzero(p, 4);
728 bcopy(V_hostname, p + 4, maxhlen); /* meaningless TTL */
729 mtx_unlock(&hostname_mtx);
730 noff = sizeof(struct ip6_hdr);
731 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
732 sizeof(struct icmp6_hdr) + 4 + maxhlen;
733 nicmp6->icmp6_type = ICMP6_WRUREPLY;
734 nicmp6->icmp6_code = 0;
735 }
736#undef hostnamelen
737 if (n) {
738 ICMP6STAT_INC(icp6s_reflect);
739 ICMP6STAT_INC(icp6s_outhist[ICMP6_WRUREPLY]);
740 icmp6_reflect(n, noff);
741 }
742 break;
743 }
744
745 case ICMP6_WRUREPLY:
746 if (code != 0)
747 goto badcode;
748 break;
749
750 case ND_ROUTER_SOLICIT:
751 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
752 if (code != 0)
753 goto badcode;
754 if (icmp6len < sizeof(struct nd_router_solicit))
755 goto badlen;
756 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
757 /* give up local */
758 nd6_rs_input(m, off, icmp6len);
759 m = NULL;
760 goto freeit;
761 }
762 nd6_rs_input(n, off, icmp6len);
763 /* m stays. */
764 break;
765
766 case ND_ROUTER_ADVERT:
767 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
768 if (code != 0)
769 goto badcode;
770 if (icmp6len < sizeof(struct nd_router_advert))
771 goto badlen;
772 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
773 /* give up local */
774 nd6_ra_input(m, off, icmp6len);
775 m = NULL;
776 goto freeit;
777 }
778 nd6_ra_input(n, off, icmp6len);
779 /* m stays. */
780 break;
781
782 case ND_NEIGHBOR_SOLICIT:
783 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
784 if (code != 0)
785 goto badcode;
786 if (icmp6len < sizeof(struct nd_neighbor_solicit))
787 goto badlen;
788 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
789 /* give up local */
790 nd6_ns_input(m, off, icmp6len);
791 m = NULL;
792 goto freeit;
793 }
794 nd6_ns_input(n, off, icmp6len);
795 /* m stays. */
796 break;
797
798 case ND_NEIGHBOR_ADVERT:
799 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
800 if (code != 0)
801 goto badcode;
802 if (icmp6len < sizeof(struct nd_neighbor_advert))
803 goto badlen;
804 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
805 /* give up local */
806 nd6_na_input(m, off, icmp6len);
807 m = NULL;
808 goto freeit;
809 }
810 nd6_na_input(n, off, icmp6len);
811 /* m stays. */
812 break;
813
814 case ND_REDIRECT:
815 icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
816 if (code != 0)
817 goto badcode;
818 if (icmp6len < sizeof(struct nd_redirect))
819 goto badlen;
820 if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
821 /* give up local */
822 icmp6_redirect_input(m, off);
823 m = NULL;
824 goto freeit;
825 }
826 icmp6_redirect_input(n, off);
827 /* m stays. */
828 break;
829
830 case ICMP6_ROUTER_RENUMBERING:
831 if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
832 code != ICMP6_ROUTER_RENUMBERING_RESULT)
833 goto badcode;
834 if (icmp6len < sizeof(struct icmp6_router_renum))
835 goto badlen;
836 break;
837
838 default:
839 nd6log((LOG_DEBUG,
840 "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
841 icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
842 ip6_sprintf(ip6bufd, &ip6->ip6_dst),
843 m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
844 if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
845 /* ICMPv6 error: MUST deliver it by spec... */
846 code = PRC_NCMDS;
847 /* deliver */
848 } else {
849 /* ICMPv6 informational: MUST not deliver */
850 break;
851 }
852 deliver:
853 if (icmp6_notify_error(&m, off, icmp6len, code)) {
854 /* In this case, m should've been freed. */
855 return (IPPROTO_DONE);
856 }
857 break;
858
859 badcode:
860 ICMP6STAT_INC(icp6s_badcode);
861 break;
862
863 badlen:
864 ICMP6STAT_INC(icp6s_badlen);
865 break;
866 }
867
868 /* deliver the packet to appropriate sockets */
869 icmp6_rip6_input(&m, *offp);
870
871 return IPPROTO_DONE;
872
873 freeit:
874 m_freem(m);
875 return IPPROTO_DONE;
876}
877
878static int
879icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
880{
881 INIT_VNET_INET6(curvnet);
882 struct mbuf *m = *mp;
883 struct icmp6_hdr *icmp6;
884 struct ip6_hdr *eip6;
885 u_int32_t notifymtu;
886 struct sockaddr_in6 icmp6src, icmp6dst;
887
888 if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
889 ICMP6STAT_INC(icp6s_tooshort);
890 goto freeit;
891 }
892#ifndef PULLDOWN_TEST
893 IP6_EXTHDR_CHECK(m, off,
894 sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
895 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
896#else
897 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
898 sizeof(*icmp6) + sizeof(struct ip6_hdr));
899 if (icmp6 == NULL) {
900 ICMP6STAT_INC(icp6s_tooshort);
901 return (-1);
902 }
903#endif
904 eip6 = (struct ip6_hdr *)(icmp6 + 1);
905
906 /* Detect the upper level protocol */
907 {
908 void (*ctlfunc)(int, struct sockaddr *, void *);
909 u_int8_t nxt = eip6->ip6_nxt;
910 int eoff = off + sizeof(struct icmp6_hdr) +
911 sizeof(struct ip6_hdr);
912 struct ip6ctlparam ip6cp;
913 struct in6_addr *finaldst = NULL;
914 int icmp6type = icmp6->icmp6_type;
915 struct ip6_frag *fh;
916 struct ip6_rthdr *rth;
917 struct ip6_rthdr0 *rth0;
918 int rthlen;
919
920 while (1) { /* XXX: should avoid infinite loop explicitly? */
921 struct ip6_ext *eh;
922
923 switch (nxt) {
924 case IPPROTO_HOPOPTS:
925 case IPPROTO_DSTOPTS:
926 case IPPROTO_AH:
927#ifndef PULLDOWN_TEST
928 IP6_EXTHDR_CHECK(m, 0,
929 eoff + sizeof(struct ip6_ext), -1);
930 eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
931#else
932 IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
933 eoff, sizeof(*eh));
934 if (eh == NULL) {
935 ICMP6STAT_INC(icp6s_tooshort);
936 return (-1);
937 }
938#endif
939
940 if (nxt == IPPROTO_AH)
941 eoff += (eh->ip6e_len + 2) << 2;
942 else
943 eoff += (eh->ip6e_len + 1) << 3;
944 nxt = eh->ip6e_nxt;
945 break;
946 case IPPROTO_ROUTING:
947 /*
948 * When the erroneous packet contains a
949 * routing header, we should examine the
950 * header to determine the final destination.
951 * Otherwise, we can't properly update
952 * information that depends on the final
953 * destination (e.g. path MTU).
954 */
955#ifndef PULLDOWN_TEST
956 IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
957 rth = (struct ip6_rthdr *)
958 (mtod(m, caddr_t) + eoff);
959#else
960 IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
961 eoff, sizeof(*rth));
962 if (rth == NULL) {
963 ICMP6STAT_INC(icp6s_tooshort);
964 return (-1);
965 }
966#endif
967 rthlen = (rth->ip6r_len + 1) << 3;
968 /*
969 * XXX: currently there is no
970 * officially defined type other
971 * than type-0.
972 * Note that if the segment left field
973 * is 0, all intermediate hops must
974 * have been passed.
975 */
976 if (rth->ip6r_segleft &&
977 rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
978 int hops;
979
980#ifndef PULLDOWN_TEST
981 IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
982 rth0 = (struct ip6_rthdr0 *)
983 (mtod(m, caddr_t) + eoff);
984#else
985 IP6_EXTHDR_GET(rth0,
986 struct ip6_rthdr0 *, m,
987 eoff, rthlen);
988 if (rth0 == NULL) {
989 ICMP6STAT_INC(icp6s_tooshort);
990 return (-1);
991 }
992#endif
993 /* just ignore a bogus header */
994 if ((rth0->ip6r0_len % 2) == 0 &&
995 (hops = rth0->ip6r0_len/2))
996 finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
997 }
998 eoff += rthlen;
999 nxt = rth->ip6r_nxt;
1000 break;
1001 case IPPROTO_FRAGMENT:
1002#ifndef PULLDOWN_TEST
1003 IP6_EXTHDR_CHECK(m, 0, eoff +
1004 sizeof(struct ip6_frag), -1);
1005 fh = (struct ip6_frag *)(mtod(m, caddr_t) +
1006 eoff);
1007#else
1008 IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
1009 eoff, sizeof(*fh));
1010 if (fh == NULL) {
1011 ICMP6STAT_INC(icp6s_tooshort);
1012 return (-1);
1013 }
1014#endif
1015 /*
1016 * Data after a fragment header is meaningless
1017 * unless it is the first fragment, but
1018 * we'll go to the notify label for path MTU
1019 * discovery.
1020 */
1021 if (fh->ip6f_offlg & IP6F_OFF_MASK)
1022 goto notify;
1023
1024 eoff += sizeof(struct ip6_frag);
1025 nxt = fh->ip6f_nxt;
1026 break;
1027 default:
1028 /*
1029 * This case includes ESP and the No Next
1030 * Header. In such cases going to the notify
1031 * label does not have any meaning
1032 * (i.e. ctlfunc will be NULL), but we go
1033 * anyway since we might have to update
1034 * path MTU information.
1035 */
1036 goto notify;
1037 }
1038 }
1039 notify:
1040#ifndef PULLDOWN_TEST
1041 icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
1042#else
1043 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
1044 sizeof(*icmp6) + sizeof(struct ip6_hdr));
1045 if (icmp6 == NULL) {
1046 ICMP6STAT_INC(icp6s_tooshort);
1047 return (-1);
1048 }
1049#endif
1050
1051 /*
1052 * retrieve parameters from the inner IPv6 header, and convert
1053 * them into sockaddr structures.
1054 * XXX: there is no guarantee that the source or destination
1055 * addresses of the inner packet are in the same scope as
1056 * the addresses of the icmp packet. But there is no other
1057 * way to determine the zone.
1058 */
1059 eip6 = (struct ip6_hdr *)(icmp6 + 1);
1060
1061 bzero(&icmp6dst, sizeof(icmp6dst));
1062 icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
1063 icmp6dst.sin6_family = AF_INET6;
1064 if (finaldst == NULL)
1065 icmp6dst.sin6_addr = eip6->ip6_dst;
1066 else
1067 icmp6dst.sin6_addr = *finaldst;
1068 if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
1069 goto freeit;
1070 bzero(&icmp6src, sizeof(icmp6src));
1071 icmp6src.sin6_len = sizeof(struct sockaddr_in6);
1072 icmp6src.sin6_family = AF_INET6;
1073 icmp6src.sin6_addr = eip6->ip6_src;
1074 if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
1075 goto freeit;
1076 icmp6src.sin6_flowinfo =
1077 (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
1078
1079 if (finaldst == NULL)
1080 finaldst = &eip6->ip6_dst;
1081 ip6cp.ip6c_m = m;
1082 ip6cp.ip6c_icmp6 = icmp6;
1083 ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
1084 ip6cp.ip6c_off = eoff;
1085 ip6cp.ip6c_finaldst = finaldst;
1086 ip6cp.ip6c_src = &icmp6src;
1087 ip6cp.ip6c_nxt = nxt;
1088
1089 if (icmp6type == ICMP6_PACKET_TOO_BIG) {
1090 notifymtu = ntohl(icmp6->icmp6_mtu);
1091 ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
1092 icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
1093 }
1094
1095 ctlfunc = (void (*)(int, struct sockaddr *, void *))
1096 (inet6sw[ip6_protox[nxt]].pr_ctlinput);
1097 if (ctlfunc) {
1098 (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
1099 &ip6cp);
1100 }
1101 }
1102 *mp = m;
1103 return (0);
1104
1105 freeit:
1106 m_freem(m);
1107 return (-1);
1108}
1109
1110void
1111icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
1112{
1113 INIT_VNET_INET6(curvnet);
1114 struct in6_addr *dst = ip6cp->ip6c_finaldst;
1115 struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
1116 struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
1117 u_int mtu = ntohl(icmp6->icmp6_mtu);
1118 struct in_conninfo inc;
1119
1120#if 0
1121 /*
1122 * RFC2460 section 5, last paragraph.
1123 * even though minimum link MTU for IPv6 is IPV6_MMTU,
1124 * we may see ICMPv6 too big with mtu < IPV6_MMTU
1125 * due to packet translator in the middle.
1126 * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
1127 * special handling.
1128 */
1129 if (mtu < IPV6_MMTU)
1130 return;
1131#endif
1132
1133 /*
1134 * we reject ICMPv6 too big with abnormally small value.
1135 * XXX what is the good definition of "abnormally small"?
1136 */
1137 if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
1138 return;
1139
1140 if (!validated)
1141 return;
1142
1143 /*
1144 * In case the suggested mtu is less than IPV6_MMTU, we
1145 * only need to remember that it was for above mentioned
1146 * "alwaysfrag" case.
1147 * Try to be as close to the spec as possible.
1148 */
1149 if (mtu < IPV6_MMTU)
1150 mtu = IPV6_MMTU - 8;
1151
1152 bzero(&inc, sizeof(inc));
1153 inc.inc_flags |= INC_ISIPV6;
1154 inc.inc6_faddr = *dst;
1155 if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
1156 return;
1157
1158 if (mtu < tcp_maxmtu6(&inc, NULL)) {
1159 tcp_hc_updatemtu(&inc, mtu);
1160 ICMP6STAT_INC(icp6s_pmtuchg);
1161 }
1162}
1163
1164/*
1165 * Process a Node Information Query packet, based on
1166 * draft-ietf-ipngwg-icmp-name-lookups-07.
1167 *
1168 * Spec incompatibilities:
1169 * - IPv6 Subject address handling
1170 * - IPv4 Subject address handling support missing
1171 * - Proxy reply (answer even if it's not for me)
1172 * - joins NI group address at in6_ifattach() time only, does not cope
1173 * with hostname changes by sethostname(3)
1174 */
1175#define hostnamelen strlen(V_hostname)
1176static struct mbuf *
1177ni6_input(struct mbuf *m, int off)
1178{
1179 INIT_VNET_INET6(curvnet);
1180 INIT_VPROCG(TD_TO_VPROCG(curthread)); /* XXX V_hostname needs this */
1181 struct icmp6_nodeinfo *ni6, *nni6;
1182 struct mbuf *n = NULL;
1183 u_int16_t qtype;
1184 int subjlen;
1185 int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1186 struct ni_reply_fqdn *fqdn;
1187 int addrs; /* for NI_QTYPE_NODEADDR */
1188 struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
1189 struct in6_addr in6_subj; /* subject address */
1190 struct ip6_hdr *ip6;
1191 int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
1192 char *subj = NULL;
1193 struct in6_ifaddr *ia6 = NULL;
1194
1195 ip6 = mtod(m, struct ip6_hdr *);
1196#ifndef PULLDOWN_TEST
1197 ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
1198#else
1199 IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
1200 if (ni6 == NULL) {
1201 /* m is already reclaimed */
1202 return (NULL);
1203 }
1204#endif
1205
1206 /*
1207 * Validate IPv6 source address.
1208 * The default configuration MUST be to refuse answering queries from
1209 * global-scope addresses according to RFC4602.
1210 * Notes:
1211 * - it's not very clear what "refuse" means; this implementation
1212 * simply drops it.
1213 * - it's not very easy to identify global-scope (unicast) addresses
1214 * since there are many prefixes for them. It should be safer
1215 * and in practice sufficient to check "all" but loopback and
1216 * link-local (note that site-local unicast was deprecated and
1217 * ULA is defined as global scope-wise)
1218 */
1219 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
1220 !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
1221 !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
1222 goto bad;
1223
1224 /*
1225 * Validate IPv6 destination address.
1226 *
1227 * The Responder must discard the Query without further processing
1228 * unless it is one of the Responder's unicast or anycast addresses, or
1229 * a link-local scope multicast address which the Responder has joined.
1230 * [RFC4602, Section 5.]
1231 */
1232 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
1233 if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
1234 goto bad;
1235 /* else it's a link-local multicast, fine */
1236 } else { /* unicast or anycast */
1237 if ((ia6 = ip6_getdstifaddr(m)) == NULL)
1238 goto bad; /* XXX impossible */
1239
1240 if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
1241 !(V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
1242 nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
1243 "a temporary address in %s:%d",
1244 __FILE__, __LINE__));
1245 goto bad;
1246 }
1247 }
1248
1249 /* validate query Subject field. */
1250 qtype = ntohs(ni6->ni_qtype);
1251 subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
1252 switch (qtype) {
1253 case NI_QTYPE_NOOP:
1254 case NI_QTYPE_SUPTYPES:
1255 /* 07 draft */
1256 if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
1257 break;
1258 /* FALLTHROUGH */
1259 case NI_QTYPE_FQDN:
1260 case NI_QTYPE_NODEADDR:
1261 case NI_QTYPE_IPV4ADDR:
1262 switch (ni6->ni_code) {
1263 case ICMP6_NI_SUBJ_IPV6:
1264#if ICMP6_NI_SUBJ_IPV6 != 0
1265 case 0:
1266#endif
1267 /*
1268 * backward compatibility - try to accept 03 draft
1269 * format, where no Subject is present.
1270 */
1271 if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
1272 subjlen == 0) {
1273 oldfqdn++;
1274 break;
1275 }
1276#if ICMP6_NI_SUBJ_IPV6 != 0
1277 if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
1278 goto bad;
1279#endif
1280
1281 if (subjlen != sizeof(struct in6_addr))
1282 goto bad;
1283
1284 /*
1285 * Validate Subject address.
1286 *
1287 * Not sure what exactly "address belongs to the node"
1288 * means in the spec, is it just unicast, or what?
1289 *
1290 * At this moment we consider Subject address as
1291 * "belong to the node" if the Subject address equals
1292 * to the IPv6 destination address; validation for
1293 * IPv6 destination address should have done enough
1294 * check for us.
1295 *
1296 * We do not do proxy at this moment.
1297 */
1298 /* m_pulldown instead of copy? */
1299 m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
1300 subjlen, (caddr_t)&in6_subj);
1301 if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
1302 goto bad;
1303
1304 subj = (char *)&in6_subj;
1305 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
1306 break;
1307
1308 /*
1309 * XXX if we are to allow other cases, we should really
1310 * be careful about scope here.
1311 * basically, we should disallow queries toward IPv6
1312 * destination X with subject Y,
1313 * if scope(X) > scope(Y).
1314 * if we allow scope(X) > scope(Y), it will result in
1315 * information leakage across scope boundary.
1316 */
1317 goto bad;
1318
1319 case ICMP6_NI_SUBJ_FQDN:
1320 /*
1321 * Validate Subject name with gethostname(3).
1322 *
1323 * The behavior may need some debate, since:
1324 * - we are not sure if the node has FQDN as
1325 * hostname (returned by gethostname(3)).
1326 * - the code does wildcard match for truncated names.
1327 * however, we are not sure if we want to perform
1328 * wildcard match, if gethostname(3) side has
1329 * truncated hostname.
1330 */
1331 mtx_lock(&hostname_mtx);
1332 n = ni6_nametodns(V_hostname, hostnamelen, 0);
1333 mtx_unlock(&hostname_mtx);
1334 if (!n || n->m_next || n->m_len == 0)
1335 goto bad;
1336 IP6_EXTHDR_GET(subj, char *, m,
1337 off + sizeof(struct icmp6_nodeinfo), subjlen);
1338 if (subj == NULL)
1339 goto bad;
1340 if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
1341 n->m_len)) {
1342 goto bad;
1343 }
1344 m_freem(n);
1345 n = NULL;
1346 break;
1347
1348 case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
1349 default:
1350 goto bad;
1351 }
1352 break;
1353 }
1354
1355 /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
1356 switch (qtype) {
1357 case NI_QTYPE_FQDN:
1358 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
1359 goto bad;
1360 break;
1361 case NI_QTYPE_NODEADDR:
1362 case NI_QTYPE_IPV4ADDR:
1363 if ((V_icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
1364 goto bad;
1365 break;
1366 }
1367
1368 /* guess reply length */
1369 switch (qtype) {
1370 case NI_QTYPE_NOOP:
1371 break; /* no reply data */
1372 case NI_QTYPE_SUPTYPES:
1373 replylen += sizeof(u_int32_t);
1374 break;
1375 case NI_QTYPE_FQDN:
1376 /* XXX will append an mbuf */
1377 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1378 break;
1379 case NI_QTYPE_NODEADDR:
1380 addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
1381 if ((replylen += addrs * (sizeof(struct in6_addr) +
1382 sizeof(u_int32_t))) > MCLBYTES)
1383 replylen = MCLBYTES; /* XXX: will truncate pkt later */
1384 break;
1385 case NI_QTYPE_IPV4ADDR:
1386 /* unsupported - should respond with unknown Qtype? */
1387 break;
1388 default:
1389 /*
1390 * XXX: We must return a reply with the ICMP6 code
1391 * `unknown Qtype' in this case. However we regard the case
1392 * as an FQDN query for backward compatibility.
1393 * Older versions set a random value to this field,
1394 * so it rarely varies in the defined qtypes.
1395 * But the mechanism is not reliable...
1396 * maybe we should obsolete older versions.
1397 */
1398 qtype = NI_QTYPE_FQDN;
1399 /* XXX will append an mbuf */
1400 replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
1401 oldfqdn++;
1402 break;
1403 }
1404
1405 /* allocate an mbuf to reply. */
1406 MGETHDR(n, M_DONTWAIT, m->m_type);
1407 if (n == NULL) {
1408 m_freem(m);
1409 return (NULL);
1410 }
1411 M_MOVE_PKTHDR(n, m); /* just for recvif */
1412 if (replylen > MHLEN) {
1413 if (replylen > MCLBYTES) {
1414 /*
1415 * XXX: should we try to allocate more? But MCLBYTES
1416 * is probably much larger than IPV6_MMTU...
1417 */
1418 goto bad;
1419 }
1420 MCLGET(n, M_DONTWAIT);
1421 if ((n->m_flags & M_EXT) == 0) {
1422 goto bad;
1423 }
1424 }
1425 n->m_pkthdr.len = n->m_len = replylen;
1426
1427 /* copy mbuf header and IPv6 + Node Information base headers */
1428 bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
1429 nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
1430 bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
1431
1432 /* qtype dependent procedure */
1433 switch (qtype) {
1434 case NI_QTYPE_NOOP:
1435 nni6->ni_code = ICMP6_NI_SUCCESS;
1436 nni6->ni_flags = 0;
1437 break;
1438 case NI_QTYPE_SUPTYPES:
1439 {
1440 u_int32_t v;
1441 nni6->ni_code = ICMP6_NI_SUCCESS;
1442 nni6->ni_flags = htons(0x0000); /* raw bitmap */
1443 /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
1444 v = (u_int32_t)htonl(0x0000000f);
1445 bcopy(&v, nni6 + 1, sizeof(u_int32_t));
1446 break;
1447 }
1448 case NI_QTYPE_FQDN:
1449 nni6->ni_code = ICMP6_NI_SUCCESS;
1450 fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
1451 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
1452 nni6->ni_flags = 0; /* XXX: meaningless TTL */
1453 fqdn->ni_fqdn_ttl = 0; /* ditto. */
1454 /*
1455 * XXX do we really have FQDN in variable "hostname"?
1456 */
1457 mtx_lock(&hostname_mtx);
1458 n->m_next = ni6_nametodns(V_hostname, hostnamelen, oldfqdn);
1459 mtx_unlock(&hostname_mtx);
1460 if (n->m_next == NULL)
1461 goto bad;
1462 /* XXX we assume that n->m_next is not a chain */
1463 if (n->m_next->m_next != NULL)
1464 goto bad;
1465 n->m_pkthdr.len += n->m_next->m_len;
1466 break;
1467 case NI_QTYPE_NODEADDR:
1468 {
1469 int lenlim, copied;
1470
1471 nni6->ni_code = ICMP6_NI_SUCCESS;
1472 n->m_pkthdr.len = n->m_len =
1473 sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
1474 lenlim = M_TRAILINGSPACE(n);
1475 copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
1476 /* XXX: reset mbuf length */
1477 n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
1478 sizeof(struct icmp6_nodeinfo) + copied;
1479 break;
1480 }
1481 default:
1482 break; /* XXX impossible! */
1483 }
1484
1485 nni6->ni_type = ICMP6_NI_REPLY;
1486 m_freem(m);
1487 return (n);
1488
1489 bad:
1490 m_freem(m);
1491 if (n)
1492 m_freem(n);
1493 return (NULL);
1494}
1495#undef hostnamelen
1496
1497/*
1498 * make a mbuf with DNS-encoded string. no compression support.
1499 *
1500 * XXX names with less than 2 dots (like "foo" or "foo.section") will be
1501 * treated as truncated name (two \0 at the end). this is a wild guess.
1502 *
1503 * old - return pascal string if non-zero
1504 */
1505static struct mbuf *
1506ni6_nametodns(const char *name, int namelen, int old)
1507{
1508 struct mbuf *m;
1509 char *cp, *ep;
1510 const char *p, *q;
1511 int i, len, nterm;
1512
1513 if (old)
1514 len = namelen + 1;
1515 else
1516 len = MCLBYTES;
1517
1518 /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
1519 MGET(m, M_DONTWAIT, MT_DATA);
1520 if (m && len > MLEN) {
1521 MCLGET(m, M_DONTWAIT);
1522 if ((m->m_flags & M_EXT) == 0)
1523 goto fail;
1524 }
1525 if (!m)
1526 goto fail;
1527 m->m_next = NULL;
1528
1529 if (old) {
1530 m->m_len = len;
1531 *mtod(m, char *) = namelen;
1532 bcopy(name, mtod(m, char *) + 1, namelen);
1533 return m;
1534 } else {
1535 m->m_len = 0;
1536 cp = mtod(m, char *);
1537 ep = mtod(m, char *) + M_TRAILINGSPACE(m);
1538
1539 /* if not certain about my name, return empty buffer */
1540 if (namelen == 0)
1541 return m;
1542
1543 /*
1544 * guess if it looks like shortened hostname, or FQDN.
1545 * shortened hostname needs two trailing "\0".
1546 */
1547 i = 0;
1548 for (p = name; p < name + namelen; p++) {
1549 if (*p && *p == '.')
1550 i++;
1551 }
1552 if (i < 2)
1553 nterm = 2;
1554 else
1555 nterm = 1;
1556
1557 p = name;
1558 while (cp < ep && p < name + namelen) {
1559 i = 0;
1560 for (q = p; q < name + namelen && *q && *q != '.'; q++)
1561 i++;
1562 /* result does not fit into mbuf */
1563 if (cp + i + 1 >= ep)
1564 goto fail;
1565 /*
1566 * DNS label length restriction, RFC1035 page 8.
1567 * "i == 0" case is included here to avoid returning
1568 * 0-length label on "foo..bar".
1569 */
1570 if (i <= 0 || i >= 64)
1571 goto fail;
1572 *cp++ = i;
1573 bcopy(p, cp, i);
1574 cp += i;
1575 p = q;
1576 if (p < name + namelen && *p == '.')
1577 p++;
1578 }
1579 /* termination */
1580 if (cp + nterm >= ep)
1581 goto fail;
1582 while (nterm-- > 0)
1583 *cp++ = '\0';
1584 m->m_len = cp - mtod(m, char *);
1585 return m;
1586 }
1587
1588 panic("should not reach here");
1589 /* NOTREACHED */
1590
1591 fail:
1592 if (m)
1593 m_freem(m);
1594 return NULL;
1595}
1596
1597/*
1598 * check if two DNS-encoded string matches. takes care of truncated
1599 * form (with \0\0 at the end). no compression support.
1600 * XXX upper/lowercase match (see RFC2065)
1601 */
1602static int
1603ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
1604{
1605 const char *a0, *b0;
1606 int l;
1607
1608 /* simplest case - need validation? */
1609 if (alen == blen && bcmp(a, b, alen) == 0)
1610 return 1;
1611
1612 a0 = a;
1613 b0 = b;
1614
1615 /* termination is mandatory */
1616 if (alen < 2 || blen < 2)
1617 return 0;
1618 if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
1619 return 0;
1620 alen--;
1621 blen--;
1622
1623 while (a - a0 < alen && b - b0 < blen) {
1624 if (a - a0 + 1 > alen || b - b0 + 1 > blen)
1625 return 0;
1626
1627 if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
1628 return 0;
1629 /* we don't support compression yet */
1630 if (a[0] >= 64 || b[0] >= 64)
1631 return 0;
1632
1633 /* truncated case */
1634 if (a[0] == 0 && a - a0 == alen - 1)
1635 return 1;
1636 if (b[0] == 0 && b - b0 == blen - 1)
1637 return 1;
1638 if (a[0] == 0 || b[0] == 0)
1639 return 0;
1640
1641 if (a[0] != b[0])
1642 return 0;
1643 l = a[0];
1644 if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
1645 return 0;
1646 if (bcmp(a + 1, b + 1, l) != 0)
1647 return 0;
1648
1649 a += 1 + l;
1650 b += 1 + l;
1651 }
1652
1653 if (a - a0 == alen && b - b0 == blen)
1654 return 1;
1655 else
1656 return 0;
1657}
1658
1659/*
1660 * calculate the number of addresses to be returned in the node info reply.
1661 */
1662static int
1663ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
1664 struct in6_addr *subj)
1665{
1666 INIT_VNET_NET(curvnet);
1667 INIT_VNET_INET6(curvnet);
1668 struct ifnet *ifp;
1669 struct in6_ifaddr *ifa6;
1670 struct ifaddr *ifa;
1671 int addrs = 0, addrsofif, iffound = 0;
1672 int niflags = ni6->ni_flags;
1673
1674 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
1675 switch (ni6->ni_code) {
1676 case ICMP6_NI_SUBJ_IPV6:
1677 if (subj == NULL) /* must be impossible... */
1678 return (0);
1679 break;
1680 default:
1681 /*
1682 * XXX: we only support IPv6 subject address for
1683 * this Qtype.
1684 */
1685 return (0);
1686 }
1687 }
1688
1689 IFNET_RLOCK();
1690 for (ifp = TAILQ_FIRST(&V_ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1691 addrsofif = 0;
1692 IF_ADDR_LOCK(ifp);
1693 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1694 if (ifa->ifa_addr->sa_family != AF_INET6)
1695 continue;
1696 ifa6 = (struct in6_ifaddr *)ifa;
1697
1698 if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
1699 IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
1700 iffound = 1;
1701
1702 /*
1703 * IPv4-mapped addresses can only be returned by a
1704 * Node Information proxy, since they represent
1705 * addresses of IPv4-only nodes, which perforce do
1706 * not implement this protocol.
1707 * [icmp-name-lookups-07, Section 5.4]
1708 * So we don't support NI_NODEADDR_FLAG_COMPAT in
1709 * this function at this moment.
1710 */
1711
1712 /* What do we have to do about ::1? */
1713 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1714 case IPV6_ADDR_SCOPE_LINKLOCAL:
1715 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1716 continue;
1717 break;
1718 case IPV6_ADDR_SCOPE_SITELOCAL:
1719 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1720 continue;
1721 break;
1722 case IPV6_ADDR_SCOPE_GLOBAL:
1723 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1724 continue;
1725 break;
1726 default:
1727 continue;
1728 }
1729
1730 /*
1731 * check if anycast is okay.
1732 * XXX: just experimental. not in the spec.
1733 */
1734 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1735 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1736 continue; /* we need only unicast addresses */
1737 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1738 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1739 continue;
1740 }
1741 addrsofif++; /* count the address */
1742 }
1743 IF_ADDR_UNLOCK(ifp);
1744 if (iffound) {
1745 *ifpp = ifp;
1746 IFNET_RUNLOCK();
1747 return (addrsofif);
1748 }
1749
1750 addrs += addrsofif;
1751 }
1752 IFNET_RUNLOCK();
1753
1754 return (addrs);
1755}
1756
1757static int
1758ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
1759 struct ifnet *ifp0, int resid)
1760{
1761 INIT_VNET_NET(curvnet);
1762 INIT_VNET_INET6(curvnet);
1763 struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&V_ifnet);
1764 struct in6_ifaddr *ifa6;
1765 struct ifaddr *ifa;
1766 struct ifnet *ifp_dep = NULL;
1767 int copied = 0, allow_deprecated = 0;
1768 u_char *cp = (u_char *)(nni6 + 1);
1769 int niflags = ni6->ni_flags;
1770 u_int32_t ltime;
1771
1772 if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
1773 return (0); /* needless to copy */
1774
1775 IFNET_RLOCK();
1776 again:
1777
1778 for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
1779 IF_ADDR_LOCK(ifp);
1780 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1781 if (ifa->ifa_addr->sa_family != AF_INET6)
1782 continue;
1783 ifa6 = (struct in6_ifaddr *)ifa;
1784
1785 if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
1786 allow_deprecated == 0) {
1787 /*
1788 * prefererred address should be put before
1789 * deprecated addresses.
1790 */
1791
1792 /* record the interface for later search */
1793 if (ifp_dep == NULL)
1794 ifp_dep = ifp;
1795
1796 continue;
1797 } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
1798 allow_deprecated != 0)
1799 continue; /* we now collect deprecated addrs */
1800
1801 /* What do we have to do about ::1? */
1802 switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
1803 case IPV6_ADDR_SCOPE_LINKLOCAL:
1804 if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
1805 continue;
1806 break;
1807 case IPV6_ADDR_SCOPE_SITELOCAL:
1808 if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
1809 continue;
1810 break;
1811 case IPV6_ADDR_SCOPE_GLOBAL:
1812 if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
1813 continue;
1814 break;
1815 default:
1816 continue;
1817 }
1818
1819 /*
1820 * check if anycast is okay.
1821 * XXX: just experimental. not in the spec.
1822 */
1823 if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
1824 (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
1825 continue;
1826 if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
1827 (V_icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
1828 continue;
1829 }
1830
1831 /* now we can copy the address */
1832 if (resid < sizeof(struct in6_addr) +
1833 sizeof(u_int32_t)) {
1834 IF_ADDR_UNLOCK(ifp);
1835 /*
1836 * We give up much more copy.
1837 * Set the truncate flag and return.
1838 */
1839 nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
1840 IFNET_RUNLOCK();
1841 return (copied);
1842 }
1843
1844 /*
1845 * Set the TTL of the address.
1846 * The TTL value should be one of the following
1847 * according to the specification:
1848 *
1849 * 1. The remaining lifetime of a DHCP lease on the
1850 * address, or
1851 * 2. The remaining Valid Lifetime of a prefix from
1852 * which the address was derived through Stateless
1853 * Autoconfiguration.
1854 *
1855 * Note that we currently do not support stateful
1856 * address configuration by DHCPv6, so the former
1857 * case can't happen.
1858 */
1859 if (ifa6->ia6_lifetime.ia6t_expire == 0)
1860 ltime = ND6_INFINITE_LIFETIME;
1861 else {
1862 if (ifa6->ia6_lifetime.ia6t_expire >
1863 time_second)
1864 ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
1865 else
1866 ltime = 0;
1867 }
1868
1869 bcopy(<ime, cp, sizeof(u_int32_t));
1870 cp += sizeof(u_int32_t);
1871
1872 /* copy the address itself */
1873 bcopy(&ifa6->ia_addr.sin6_addr, cp,
1874 sizeof(struct in6_addr));
1875 in6_clearscope((struct in6_addr *)cp); /* XXX */
1876 cp += sizeof(struct in6_addr);
1877
1878 resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
1879 copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
1880 }
1881 IF_ADDR_UNLOCK(ifp);
1882 if (ifp0) /* we need search only on the specified IF */
1883 break;
1884 }
1885
1886 if (allow_deprecated == 0 && ifp_dep != NULL) {
1887 ifp = ifp_dep;
1888 allow_deprecated = 1;
1889
1890 goto again;
1891 }
1892
1893 IFNET_RUNLOCK();
1894
1895 return (copied);
1896}
1897
1898/*
1899 * XXX almost dup'ed code with rip6_input.
1900 */
1901static int
1902icmp6_rip6_input(struct mbuf **mp, int off)
1903{
1904 INIT_VNET_INET(curvnet);
1905 INIT_VNET_INET6(curvnet);
1906 struct mbuf *m = *mp;
1907 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
1908 struct inpcb *in6p;
1909 struct inpcb *last = NULL;
1910 struct sockaddr_in6 fromsa;
1911 struct icmp6_hdr *icmp6;
1912 struct mbuf *opts = NULL;
1913
1914#ifndef PULLDOWN_TEST
1915 /* this is assumed to be safe. */
1916 icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
1917#else
1918 IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
1919 if (icmp6 == NULL) {
1920 /* m is already reclaimed */
1921 return (IPPROTO_DONE);
1922 }
1923#endif
1924
1925 /*
1926 * XXX: the address may have embedded scope zone ID, which should be
1927 * hidden from applications.
1928 */
1929 bzero(&fromsa, sizeof(fromsa));
1930 fromsa.sin6_family = AF_INET6;
1931 fromsa.sin6_len = sizeof(struct sockaddr_in6);
1932 fromsa.sin6_addr = ip6->ip6_src;
1933 if (sa6_recoverscope(&fromsa)) {
1934 m_freem(m);
1935 return (IPPROTO_DONE);
1936 }
1937
1938 INP_INFO_RLOCK(&V_ripcbinfo);
1939 LIST_FOREACH(in6p, &V_ripcb, inp_list) {
1940 if ((in6p->inp_vflag & INP_IPV6) == 0)
1941 continue;
1942 if (in6p->inp_ip_p != IPPROTO_ICMPV6)
1943 continue;
1944 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
1945 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
1946 continue;
1947 if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
1948 !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
1949 continue;
1950 INP_RLOCK(in6p);
1951 if (ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
1952 in6p->in6p_icmp6filt)) {
1953 INP_RUNLOCK(in6p);
1954 continue;
1955 }
1956 if (last != NULL) {
1957 struct mbuf *n = NULL;
1958
1959 /*
1960 * Recent network drivers tend to allocate a single
1961 * mbuf cluster, rather than to make a couple of
1962 * mbufs without clusters. Also, since the IPv6 code
1963 * path tries to avoid m_pullup(), it is highly
1964 * probable that we still have an mbuf cluster here
1965 * even though the necessary length can be stored in an
1966 * mbuf's internal buffer.
1967 * Meanwhile, the default size of the receive socket
1968 * buffer for raw sockets is not so large. This means
1969 * the possibility of packet loss is relatively higher
1970 * than before. To avoid this scenario, we copy the
1971 * received data to a separate mbuf that does not use
1972 * a cluster, if possible.
1973 * XXX: it is better to copy the data after stripping
1974 * intermediate headers.
1975 */
1976 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
1977 m->m_len <= MHLEN) {
1978 MGET(n, M_DONTWAIT, m->m_type);
1979 if (n != NULL) {
1980 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
1981 bcopy(m->m_data, n->m_data,
1982 m->m_len);
1983 n->m_len = m->m_len;
1984 } else {
1985 m_free(n);
1986 n = NULL;
1987 }
1988 }
1989 }
1990 if (n != NULL ||
1991 (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
1992 if (last->inp_flags & INP_CONTROLOPTS)
1993 ip6_savecontrol(last, n, &opts);
1994 /* strip intermediate headers */
1995 m_adj(n, off);
1996 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
1997 if (sbappendaddr_locked(
1998 &last->inp_socket->so_rcv,
1999 (struct sockaddr *)&fromsa, n, opts)
2000 == 0) {
2001 /* should notify about lost packet */
2002 m_freem(n);
2003 if (opts) {
2004 m_freem(opts);
2005 }
2006 SOCKBUF_UNLOCK(
2007 &last->inp_socket->so_rcv);
2008 } else
2009 sorwakeup_locked(last->inp_socket);
2010 opts = NULL;
2011 }
2012 INP_RUNLOCK(last);
2013 }
2014 last = in6p;
2015 }
2016 INP_INFO_RUNLOCK(&V_ripcbinfo);
2017 if (last != NULL) {
2018 if (last->inp_flags & INP_CONTROLOPTS)
2019 ip6_savecontrol(last, m, &opts);
2020 /* strip intermediate headers */
2021 m_adj(m, off);
2022
2023 /* avoid using mbuf clusters if possible (see above) */
2024 if ((m->m_flags & M_EXT) && m->m_next == NULL &&
2025 m->m_len <= MHLEN) {
2026 struct mbuf *n;
2027
2028 MGET(n, M_DONTWAIT, m->m_type);
2029 if (n != NULL) {
2030 if (m_dup_pkthdr(n, m, M_NOWAIT)) {
2031 bcopy(m->m_data, n->m_data, m->m_len);
2032 n->m_len = m->m_len;
2033
2034 m_freem(m);
2035 m = n;
2036 } else {
2037 m_freem(n);
2038 n = NULL;
2039 }
2040 }
2041 }
2042 SOCKBUF_LOCK(&last->inp_socket->so_rcv);
2043 if (sbappendaddr_locked(&last->inp_socket->so_rcv,
2044 (struct sockaddr *)&fromsa, m, opts) == 0) {
2045 m_freem(m);
2046 if (opts)
2047 m_freem(opts);
2048 SOCKBUF_UNLOCK(&last->inp_socket->so_rcv);
2049 } else
2050 sorwakeup_locked(last->inp_socket);
2051 INP_RUNLOCK(last);
2052 } else {
2053 m_freem(m);
|
2053 V_ip6stat.ip6s_delivered--;
| 2054 IP6STAT_DEC(ip6s_delivered);
|
2054 }
2055 return IPPROTO_DONE;
2056}
2057
2058/*
2059 * Reflect the ip6 packet back to the source.
2060 * OFF points to the icmp6 header, counted from the top of the mbuf.
2061 */
2062void
2063icmp6_reflect(struct mbuf *m, size_t off)
2064{
2065 INIT_VNET_INET6(curvnet);
2066 struct ip6_hdr *ip6;
2067 struct icmp6_hdr *icmp6;
2068 struct in6_ifaddr *ia;
2069 int plen;
2070 int type, code;
2071 struct ifnet *outif = NULL;
2072 struct in6_addr origdst, *src = NULL;
2073
2074 /* too short to reflect */
2075 if (off < sizeof(struct ip6_hdr)) {
2076 nd6log((LOG_DEBUG,
2077 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2078 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2079 __FILE__, __LINE__));
2080 goto bad;
2081 }
2082
2083 /*
2084 * If there are extra headers between IPv6 and ICMPv6, strip
2085 * off that header first.
2086 */
2087#ifdef DIAGNOSTIC
2088 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2089 panic("assumption failed in icmp6_reflect");
2090#endif
2091 if (off > sizeof(struct ip6_hdr)) {
2092 size_t l;
2093 struct ip6_hdr nip6;
2094
2095 l = off - sizeof(struct ip6_hdr);
2096 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2097 m_adj(m, l);
2098 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2099 if (m->m_len < l) {
2100 if ((m = m_pullup(m, l)) == NULL)
2101 return;
2102 }
2103 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2104 } else /* off == sizeof(struct ip6_hdr) */ {
2105 size_t l;
2106 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2107 if (m->m_len < l) {
2108 if ((m = m_pullup(m, l)) == NULL)
2109 return;
2110 }
2111 }
2112 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2113 ip6 = mtod(m, struct ip6_hdr *);
2114 ip6->ip6_nxt = IPPROTO_ICMPV6;
2115 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2116 type = icmp6->icmp6_type; /* keep type for statistics */
2117 code = icmp6->icmp6_code; /* ditto. */
2118
2119 origdst = ip6->ip6_dst;
2120 /*
2121 * ip6_input() drops a packet if its src is multicast.
2122 * So, the src is never multicast.
2123 */
2124 ip6->ip6_dst = ip6->ip6_src;
2125
2126 /*
2127 * If the incoming packet was addressed directly to us (i.e. unicast),
2128 * use dst as the src for the reply.
2129 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2130 * (for example) when we encounter an error while forwarding procedure
2131 * destined to a duplicated address of ours.
2132 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2133 * procedure of an outgoing packet of our own, in which case we need
2134 * to search in the ifaddr list.
2135 */
2136 if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
2137 if ((ia = ip6_getdstifaddr(m))) {
2138 if (!(ia->ia6_flags &
2139 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
2140 src = &ia->ia_addr.sin6_addr;
2141 } else {
2142 struct sockaddr_in6 d;
2143
2144 bzero(&d, sizeof(d));
2145 d.sin6_family = AF_INET6;
2146 d.sin6_len = sizeof(d);
2147 d.sin6_addr = origdst;
2148 ia = (struct in6_ifaddr *)
2149 ifa_ifwithaddr((struct sockaddr *)&d);
2150 if (ia &&
2151 !(ia->ia6_flags &
2152 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2153 src = &ia->ia_addr.sin6_addr;
2154 }
2155 }
2156 }
2157
2158 if (src == NULL) {
2159 int e;
2160 struct sockaddr_in6 sin6;
2161 struct route_in6 ro;
2162
2163 /*
2164 * This case matches to multicasts, our anycast, or unicasts
2165 * that we do not own. Select a source address based on the
2166 * source address of the erroneous packet.
2167 */
2168 bzero(&sin6, sizeof(sin6));
2169 sin6.sin6_family = AF_INET6;
2170 sin6.sin6_len = sizeof(sin6);
2171 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2172
2173 bzero(&ro, sizeof(ro));
2174 src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e);
2175 if (ro.ro_rt)
2176 RTFREE(ro.ro_rt); /* XXX: we could use this */
2177 if (src == NULL) {
2178 char ip6buf[INET6_ADDRSTRLEN];
2179 nd6log((LOG_DEBUG,
2180 "icmp6_reflect: source can't be determined: "
2181 "dst=%s, error=%d\n",
2182 ip6_sprintf(ip6buf, &sin6.sin6_addr), e));
2183 goto bad;
2184 }
2185 }
2186
2187 ip6->ip6_src = *src;
2188 ip6->ip6_flow = 0;
2189 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2190 ip6->ip6_vfc |= IPV6_VERSION;
2191 ip6->ip6_nxt = IPPROTO_ICMPV6;
2192 if (outif)
2193 ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
2194 else if (m->m_pkthdr.rcvif) {
2195 /* XXX: This may not be the outgoing interface */
2196 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2197 } else
2198 ip6->ip6_hlim = V_ip6_defhlim;
2199
2200 icmp6->icmp6_cksum = 0;
2201 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2202 sizeof(struct ip6_hdr), plen);
2203
2204 /*
2205 * XXX option handling
2206 */
2207
2208 m->m_flags &= ~(M_BCAST|M_MCAST);
2209
2210 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2211 if (outif)
2212 icmp6_ifoutstat_inc(outif, type, code);
2213
2214 return;
2215
2216 bad:
2217 m_freem(m);
2218 return;
2219}
2220
2221void
2222icmp6_fasttimo(void)
2223{
2224
| 2055 }
2056 return IPPROTO_DONE;
2057}
2058
2059/*
2060 * Reflect the ip6 packet back to the source.
2061 * OFF points to the icmp6 header, counted from the top of the mbuf.
2062 */
2063void
2064icmp6_reflect(struct mbuf *m, size_t off)
2065{
2066 INIT_VNET_INET6(curvnet);
2067 struct ip6_hdr *ip6;
2068 struct icmp6_hdr *icmp6;
2069 struct in6_ifaddr *ia;
2070 int plen;
2071 int type, code;
2072 struct ifnet *outif = NULL;
2073 struct in6_addr origdst, *src = NULL;
2074
2075 /* too short to reflect */
2076 if (off < sizeof(struct ip6_hdr)) {
2077 nd6log((LOG_DEBUG,
2078 "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
2079 (u_long)off, (u_long)sizeof(struct ip6_hdr),
2080 __FILE__, __LINE__));
2081 goto bad;
2082 }
2083
2084 /*
2085 * If there are extra headers between IPv6 and ICMPv6, strip
2086 * off that header first.
2087 */
2088#ifdef DIAGNOSTIC
2089 if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
2090 panic("assumption failed in icmp6_reflect");
2091#endif
2092 if (off > sizeof(struct ip6_hdr)) {
2093 size_t l;
2094 struct ip6_hdr nip6;
2095
2096 l = off - sizeof(struct ip6_hdr);
2097 m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
2098 m_adj(m, l);
2099 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2100 if (m->m_len < l) {
2101 if ((m = m_pullup(m, l)) == NULL)
2102 return;
2103 }
2104 bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
2105 } else /* off == sizeof(struct ip6_hdr) */ {
2106 size_t l;
2107 l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
2108 if (m->m_len < l) {
2109 if ((m = m_pullup(m, l)) == NULL)
2110 return;
2111 }
2112 }
2113 plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
2114 ip6 = mtod(m, struct ip6_hdr *);
2115 ip6->ip6_nxt = IPPROTO_ICMPV6;
2116 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
2117 type = icmp6->icmp6_type; /* keep type for statistics */
2118 code = icmp6->icmp6_code; /* ditto. */
2119
2120 origdst = ip6->ip6_dst;
2121 /*
2122 * ip6_input() drops a packet if its src is multicast.
2123 * So, the src is never multicast.
2124 */
2125 ip6->ip6_dst = ip6->ip6_src;
2126
2127 /*
2128 * If the incoming packet was addressed directly to us (i.e. unicast),
2129 * use dst as the src for the reply.
2130 * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
2131 * (for example) when we encounter an error while forwarding procedure
2132 * destined to a duplicated address of ours.
2133 * Note that ip6_getdstifaddr() may fail if we are in an error handling
2134 * procedure of an outgoing packet of our own, in which case we need
2135 * to search in the ifaddr list.
2136 */
2137 if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
2138 if ((ia = ip6_getdstifaddr(m))) {
2139 if (!(ia->ia6_flags &
2140 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
2141 src = &ia->ia_addr.sin6_addr;
2142 } else {
2143 struct sockaddr_in6 d;
2144
2145 bzero(&d, sizeof(d));
2146 d.sin6_family = AF_INET6;
2147 d.sin6_len = sizeof(d);
2148 d.sin6_addr = origdst;
2149 ia = (struct in6_ifaddr *)
2150 ifa_ifwithaddr((struct sockaddr *)&d);
2151 if (ia &&
2152 !(ia->ia6_flags &
2153 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
2154 src = &ia->ia_addr.sin6_addr;
2155 }
2156 }
2157 }
2158
2159 if (src == NULL) {
2160 int e;
2161 struct sockaddr_in6 sin6;
2162 struct route_in6 ro;
2163
2164 /*
2165 * This case matches to multicasts, our anycast, or unicasts
2166 * that we do not own. Select a source address based on the
2167 * source address of the erroneous packet.
2168 */
2169 bzero(&sin6, sizeof(sin6));
2170 sin6.sin6_family = AF_INET6;
2171 sin6.sin6_len = sizeof(sin6);
2172 sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
2173
2174 bzero(&ro, sizeof(ro));
2175 src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e);
2176 if (ro.ro_rt)
2177 RTFREE(ro.ro_rt); /* XXX: we could use this */
2178 if (src == NULL) {
2179 char ip6buf[INET6_ADDRSTRLEN];
2180 nd6log((LOG_DEBUG,
2181 "icmp6_reflect: source can't be determined: "
2182 "dst=%s, error=%d\n",
2183 ip6_sprintf(ip6buf, &sin6.sin6_addr), e));
2184 goto bad;
2185 }
2186 }
2187
2188 ip6->ip6_src = *src;
2189 ip6->ip6_flow = 0;
2190 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2191 ip6->ip6_vfc |= IPV6_VERSION;
2192 ip6->ip6_nxt = IPPROTO_ICMPV6;
2193 if (outif)
2194 ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
2195 else if (m->m_pkthdr.rcvif) {
2196 /* XXX: This may not be the outgoing interface */
2197 ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
2198 } else
2199 ip6->ip6_hlim = V_ip6_defhlim;
2200
2201 icmp6->icmp6_cksum = 0;
2202 icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2203 sizeof(struct ip6_hdr), plen);
2204
2205 /*
2206 * XXX option handling
2207 */
2208
2209 m->m_flags &= ~(M_BCAST|M_MCAST);
2210
2211 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2212 if (outif)
2213 icmp6_ifoutstat_inc(outif, type, code);
2214
2215 return;
2216
2217 bad:
2218 m_freem(m);
2219 return;
2220}
2221
2222void
2223icmp6_fasttimo(void)
2224{
2225
|
2225 return;
| 2226 mld_fasttimo();
|
2226}
2227
| 2227}
2228
|
| 2229void
2230icmp6_slowtimo(void)
2231{
2232
2233 mld_slowtimo();
2234}
2235
|
2228static const char *
2229icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2230 struct in6_addr *tgt6)
2231{
2232 static char buf[1024];
2233 char ip6bufs[INET6_ADDRSTRLEN];
2234 char ip6bufd[INET6_ADDRSTRLEN];
2235 char ip6buft[INET6_ADDRSTRLEN];
2236 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2237 ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
2238 ip6_sprintf(ip6buft, tgt6));
2239 return buf;
2240}
2241
2242void
2243icmp6_redirect_input(struct mbuf *m, int off)
2244{
2245 INIT_VNET_INET6(curvnet);
2246 struct ifnet *ifp;
2247 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2248 struct nd_redirect *nd_rd;
2249 int icmp6len = ntohs(ip6->ip6_plen);
2250 char *lladdr = NULL;
2251 int lladdrlen = 0;
2252 u_char *redirhdr = NULL;
2253 int redirhdrlen = 0;
2254 struct rtentry *rt = NULL;
2255 int is_router;
2256 int is_onlink;
2257 struct in6_addr src6 = ip6->ip6_src;
2258 struct in6_addr redtgt6;
2259 struct in6_addr reddst6;
2260 union nd_opts ndopts;
2261 char ip6buf[INET6_ADDRSTRLEN];
2262
2263 if (!m)
2264 return;
2265
2266 ifp = m->m_pkthdr.rcvif;
2267
2268 if (!ifp)
2269 return;
2270
2271 /* XXX if we are router, we don't update route by icmp6 redirect */
2272 if (V_ip6_forwarding)
2273 goto freeit;
2274 if (!V_icmp6_rediraccept)
2275 goto freeit;
2276
2277#ifndef PULLDOWN_TEST
2278 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2279 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2280#else
2281 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2282 if (nd_rd == NULL) {
2283 ICMP6STAT_INC(icp6s_tooshort);
2284 return;
2285 }
2286#endif
2287 redtgt6 = nd_rd->nd_rd_target;
2288 reddst6 = nd_rd->nd_rd_dst;
2289
2290 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2291 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2292 goto freeit;
2293 }
2294
2295 /* validation */
2296 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2297 nd6log((LOG_ERR,
2298 "ICMP6 redirect sent from %s rejected; "
2299 "must be from linklocal\n",
2300 ip6_sprintf(ip6buf, &src6)));
2301 goto bad;
2302 }
2303 if (ip6->ip6_hlim != 255) {
2304 nd6log((LOG_ERR,
2305 "ICMP6 redirect sent from %s rejected; "
2306 "hlim=%d (must be 255)\n",
2307 ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
2308 goto bad;
2309 }
2310 {
2311 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2312 struct sockaddr_in6 sin6;
2313 struct in6_addr *gw6;
2314
2315 bzero(&sin6, sizeof(sin6));
2316 sin6.sin6_family = AF_INET6;
2317 sin6.sin6_len = sizeof(struct sockaddr_in6);
2318 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2319 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
2320 if (rt) {
2321 if (rt->rt_gateway == NULL ||
2322 rt->rt_gateway->sa_family != AF_INET6) {
2323 nd6log((LOG_ERR,
2324 "ICMP6 redirect rejected; no route "
2325 "with inet6 gateway found for redirect dst: %s\n",
2326 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2327 RTFREE_LOCKED(rt);
2328 goto bad;
2329 }
2330
2331 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2332 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2333 nd6log((LOG_ERR,
2334 "ICMP6 redirect rejected; "
2335 "not equal to gw-for-src=%s (must be same): "
2336 "%s\n",
2337 ip6_sprintf(ip6buf, gw6),
2338 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2339 RTFREE_LOCKED(rt);
2340 goto bad;
2341 }
2342 } else {
2343 nd6log((LOG_ERR,
2344 "ICMP6 redirect rejected; "
2345 "no route found for redirect dst: %s\n",
2346 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2347 goto bad;
2348 }
2349 RTFREE_LOCKED(rt);
2350 rt = NULL;
2351 }
2352 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2353 nd6log((LOG_ERR,
2354 "ICMP6 redirect rejected; "
2355 "redirect dst must be unicast: %s\n",
2356 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2357 goto bad;
2358 }
2359
2360 is_router = is_onlink = 0;
2361 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2362 is_router = 1; /* router case */
2363 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2364 is_onlink = 1; /* on-link destination case */
2365 if (!is_router && !is_onlink) {
2366 nd6log((LOG_ERR,
2367 "ICMP6 redirect rejected; "
2368 "neither router case nor onlink case: %s\n",
2369 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2370 goto bad;
2371 }
2372 /* validation passed */
2373
2374 icmp6len -= sizeof(*nd_rd);
2375 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2376 if (nd6_options(&ndopts) < 0) {
2377 nd6log((LOG_INFO, "icmp6_redirect_input: "
2378 "invalid ND option, rejected: %s\n",
2379 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2380 /* nd6_options have incremented stats */
2381 goto freeit;
2382 }
2383
2384 if (ndopts.nd_opts_tgt_lladdr) {
2385 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2386 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2387 }
2388
2389 if (ndopts.nd_opts_rh) {
2390 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2391 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2392 }
2393
2394 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2395 nd6log((LOG_INFO,
2396 "icmp6_redirect_input: lladdrlen mismatch for %s "
2397 "(if %d, icmp6 packet %d): %s\n",
2398 ip6_sprintf(ip6buf, &redtgt6),
2399 ifp->if_addrlen, lladdrlen - 2,
2400 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2401 goto bad;
2402 }
2403
2404 /* RFC 2461 8.3 */
2405 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2406 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2407
2408 if (!is_onlink) { /* better router case. perform rtredirect. */
2409 /* perform rtredirect */
2410 struct sockaddr_in6 sdst;
2411 struct sockaddr_in6 sgw;
2412 struct sockaddr_in6 ssrc;
2413
2414 bzero(&sdst, sizeof(sdst));
2415 bzero(&sgw, sizeof(sgw));
2416 bzero(&ssrc, sizeof(ssrc));
2417 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2418 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2419 sizeof(struct sockaddr_in6);
2420 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2421 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2422 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2423 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2424 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2425 (struct sockaddr *)&ssrc);
2426 }
2427 /* finally update cached route in each socket via pfctlinput */
2428 {
2429 struct sockaddr_in6 sdst;
2430
2431 bzero(&sdst, sizeof(sdst));
2432 sdst.sin6_family = AF_INET6;
2433 sdst.sin6_len = sizeof(struct sockaddr_in6);
2434 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2435 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2436#ifdef IPSEC
2437 key_sa_routechange((struct sockaddr *)&sdst);
2438#endif /* IPSEC */
2439 }
2440
2441 freeit:
2442 m_freem(m);
2443 return;
2444
2445 bad:
2446 ICMP6STAT_INC(icp6s_badredirect);
2447 m_freem(m);
2448}
2449
2450void
2451icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2452{
2453 INIT_VNET_INET6(curvnet);
2454 struct ifnet *ifp; /* my outgoing interface */
2455 struct in6_addr *ifp_ll6;
2456 struct in6_addr *router_ll6;
2457 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2458 struct mbuf *m = NULL; /* newly allocated one */
2459 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2460 struct nd_redirect *nd_rd;
2461 struct llentry *ln = NULL;
2462 size_t maxlen;
2463 u_char *p;
2464 struct ifnet *outif = NULL;
2465 struct sockaddr_in6 src_sa;
2466
2467 icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2468
2469 /* if we are not router, we don't send icmp6 redirect */
2470 if (!V_ip6_forwarding)
2471 goto fail;
2472
2473 /* sanity check */
2474 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2475 goto fail;
2476
2477 /*
2478 * Address check:
2479 * the source address must identify a neighbor, and
2480 * the destination address must not be a multicast address
2481 * [RFC 2461, sec 8.2]
2482 */
2483 sip6 = mtod(m0, struct ip6_hdr *);
2484 bzero(&src_sa, sizeof(src_sa));
2485 src_sa.sin6_family = AF_INET6;
2486 src_sa.sin6_len = sizeof(src_sa);
2487 src_sa.sin6_addr = sip6->ip6_src;
2488 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2489 goto fail;
2490 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2491 goto fail; /* what should we do here? */
2492
2493 /* rate limit */
2494 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2495 goto fail;
2496
2497 /*
2498 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2499 * we almost always ask for an mbuf cluster for simplicity.
2500 * (MHLEN < IPV6_MMTU is almost always true)
2501 */
2502#if IPV6_MMTU >= MCLBYTES
2503# error assumption failed about IPV6_MMTU and MCLBYTES
2504#endif
2505 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2506 if (m && IPV6_MMTU >= MHLEN)
2507 MCLGET(m, M_DONTWAIT);
2508 if (!m)
2509 goto fail;
2510 m->m_pkthdr.rcvif = NULL;
2511 m->m_len = 0;
2512 maxlen = M_TRAILINGSPACE(m);
2513 maxlen = min(IPV6_MMTU, maxlen);
2514 /* just for safety */
2515 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2516 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2517 goto fail;
2518 }
2519
2520 {
2521 /* get ip6 linklocal address for ifp(my outgoing interface). */
2522 struct in6_ifaddr *ia;
2523 if ((ia = in6ifa_ifpforlinklocal(ifp,
2524 IN6_IFF_NOTREADY|
2525 IN6_IFF_ANYCAST)) == NULL)
2526 goto fail;
2527 ifp_ll6 = &ia->ia_addr.sin6_addr;
2528 }
2529
2530 /* get ip6 linklocal address for the router. */
2531 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2532 struct sockaddr_in6 *sin6;
2533 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2534 router_ll6 = &sin6->sin6_addr;
2535 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2536 router_ll6 = (struct in6_addr *)NULL;
2537 } else
2538 router_ll6 = (struct in6_addr *)NULL;
2539
2540 /* ip6 */
2541 ip6 = mtod(m, struct ip6_hdr *);
2542 ip6->ip6_flow = 0;
2543 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2544 ip6->ip6_vfc |= IPV6_VERSION;
2545 /* ip6->ip6_plen will be set later */
2546 ip6->ip6_nxt = IPPROTO_ICMPV6;
2547 ip6->ip6_hlim = 255;
2548 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2549 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2550 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2551
2552 /* ND Redirect */
2553 nd_rd = (struct nd_redirect *)(ip6 + 1);
2554 nd_rd->nd_rd_type = ND_REDIRECT;
2555 nd_rd->nd_rd_code = 0;
2556 nd_rd->nd_rd_reserved = 0;
2557 if (rt->rt_flags & RTF_GATEWAY) {
2558 /*
2559 * nd_rd->nd_rd_target must be a link-local address in
2560 * better router cases.
2561 */
2562 if (!router_ll6)
2563 goto fail;
2564 bcopy(router_ll6, &nd_rd->nd_rd_target,
2565 sizeof(nd_rd->nd_rd_target));
2566 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2567 sizeof(nd_rd->nd_rd_dst));
2568 } else {
2569 /* make sure redtgt == reddst */
2570 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2571 sizeof(nd_rd->nd_rd_target));
2572 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2573 sizeof(nd_rd->nd_rd_dst));
2574 }
2575
2576 p = (u_char *)(nd_rd + 1);
2577
2578 if (!router_ll6)
2579 goto nolladdropt;
2580
2581 {
2582 /* target lladdr option */
2583 int len;
2584 struct nd_opt_hdr *nd_opt;
2585 char *lladdr;
2586
2587 IF_AFDATA_LOCK(ifp);
2588 ln = nd6_lookup(router_ll6, 0, ifp);
2589 IF_AFDATA_UNLOCK(ifp);
2590 if (ln == NULL)
2591 goto nolladdropt;
2592
2593 len = sizeof(*nd_opt) + ifp->if_addrlen;
2594 len = (len + 7) & ~7; /* round by 8 */
2595 /* safety check */
2596 if (len + (p - (u_char *)ip6) > maxlen)
2597 goto nolladdropt;
2598
2599 if (ln->la_flags & LLE_VALID) {
2600 nd_opt = (struct nd_opt_hdr *)p;
2601 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2602 nd_opt->nd_opt_len = len >> 3;
2603 lladdr = (char *)(nd_opt + 1);
2604 bcopy(&ln->ll_addr, lladdr, ifp->if_addrlen);
2605 p += len;
2606 }
2607 }
2608nolladdropt:
2609 if (ln != NULL)
2610 LLE_RUNLOCK(ln);
2611
2612 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2613
2614 /* just to be safe */
2615#ifdef M_DECRYPTED /*not openbsd*/
2616 if (m0->m_flags & M_DECRYPTED)
2617 goto noredhdropt;
2618#endif
2619 if (p - (u_char *)ip6 > maxlen)
2620 goto noredhdropt;
2621
2622 {
2623 /* redirected header option */
2624 int len;
2625 struct nd_opt_rd_hdr *nd_opt_rh;
2626
2627 /*
2628 * compute the maximum size for icmp6 redirect header option.
2629 * XXX room for auth header?
2630 */
2631 len = maxlen - (p - (u_char *)ip6);
2632 len &= ~7;
2633
2634 /* This is just for simplicity. */
2635 if (m0->m_pkthdr.len != m0->m_len) {
2636 if (m0->m_next) {
2637 m_freem(m0->m_next);
2638 m0->m_next = NULL;
2639 }
2640 m0->m_pkthdr.len = m0->m_len;
2641 }
2642
2643 /*
2644 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2645 * about padding/truncate rule for the original IP packet.
2646 * From the discussion on IPv6imp in Feb 1999,
2647 * the consensus was:
2648 * - "attach as much as possible" is the goal
2649 * - pad if not aligned (original size can be guessed by
2650 * original ip6 header)
2651 * Following code adds the padding if it is simple enough,
2652 * and truncates if not.
2653 */
2654 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2655 panic("assumption failed in %s:%d", __FILE__,
2656 __LINE__);
2657
2658 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2659 /* not enough room, truncate */
2660 m0->m_pkthdr.len = m0->m_len = len -
2661 sizeof(*nd_opt_rh);
2662 } else {
2663 /* enough room, pad or truncate */
2664 size_t extra;
2665
2666 extra = m0->m_pkthdr.len % 8;
2667 if (extra) {
2668 /* pad if easy enough, truncate if not */
2669 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2670 /* pad */
2671 m0->m_len += (8 - extra);
2672 m0->m_pkthdr.len += (8 - extra);
2673 } else {
2674 /* truncate */
2675 m0->m_pkthdr.len -= extra;
2676 m0->m_len -= extra;
2677 }
2678 }
2679 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2680 m0->m_pkthdr.len = m0->m_len = len -
2681 sizeof(*nd_opt_rh);
2682 }
2683
2684 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2685 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2686 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2687 nd_opt_rh->nd_opt_rh_len = len >> 3;
2688 p += sizeof(*nd_opt_rh);
2689 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2690
2691 /* connect m0 to m */
2692 m_tag_delete_chain(m0, NULL);
2693 m0->m_flags &= ~M_PKTHDR;
2694 m->m_next = m0;
2695 m->m_pkthdr.len = m->m_len + m0->m_len;
2696 m0 = NULL;
2697 }
2698noredhdropt:;
2699 if (m0) {
2700 m_freem(m0);
2701 m0 = NULL;
2702 }
2703
2704 /* XXX: clear embedded link IDs in the inner header */
2705 in6_clearscope(&sip6->ip6_src);
2706 in6_clearscope(&sip6->ip6_dst);
2707 in6_clearscope(&nd_rd->nd_rd_target);
2708 in6_clearscope(&nd_rd->nd_rd_dst);
2709
2710 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2711
2712 nd_rd->nd_rd_cksum = 0;
2713 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2714 sizeof(*ip6), ntohs(ip6->ip6_plen));
2715
2716 /* send the packet to outside... */
2717 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2718 if (outif) {
2719 icmp6_ifstat_inc(outif, ifs6_out_msg);
2720 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2721 }
2722 ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
2723
2724 return;
2725
2726fail:
2727 if (m)
2728 m_freem(m);
2729 if (m0)
2730 m_freem(m0);
2731}
2732
2733/*
2734 * ICMPv6 socket option processing.
2735 */
2736int
2737icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2738{
2739 int error = 0;
2740 int optlen;
2741 struct inpcb *inp = sotoinpcb(so);
2742 int level, op, optname;
2743
2744 if (sopt) {
2745 level = sopt->sopt_level;
2746 op = sopt->sopt_dir;
2747 optname = sopt->sopt_name;
2748 optlen = sopt->sopt_valsize;
2749 } else
2750 level = op = optname = optlen = 0;
2751
2752 if (level != IPPROTO_ICMPV6) {
2753 return EINVAL;
2754 }
2755
2756 switch (op) {
2757 case PRCO_SETOPT:
2758 switch (optname) {
2759 case ICMP6_FILTER:
2760 {
2761 struct icmp6_filter ic6f;
2762
2763 if (optlen != sizeof(ic6f)) {
2764 error = EMSGSIZE;
2765 break;
2766 }
2767 error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2768 if (error == 0) {
2769 INP_WLOCK(inp);
2770 *inp->in6p_icmp6filt = ic6f;
2771 INP_WUNLOCK(inp);
2772 }
2773 break;
2774 }
2775
2776 default:
2777 error = ENOPROTOOPT;
2778 break;
2779 }
2780 break;
2781
2782 case PRCO_GETOPT:
2783 switch (optname) {
2784 case ICMP6_FILTER:
2785 {
2786 struct icmp6_filter ic6f;
2787
2788 INP_RLOCK(inp);
2789 ic6f = *inp->in6p_icmp6filt;
2790 INP_RUNLOCK(inp);
2791 error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
2792 break;
2793 }
2794
2795 default:
2796 error = ENOPROTOOPT;
2797 break;
2798 }
2799 break;
2800 }
2801
2802 return (error);
2803}
2804
2805/*
2806 * Perform rate limit check.
2807 * Returns 0 if it is okay to send the icmp6 packet.
2808 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2809 * limitation.
2810 *
2811 * XXX per-destination/type check necessary?
2812 *
2813 * dst - not used at this moment
2814 * type - not used at this moment
2815 * code - not used at this moment
2816 */
2817static int
2818icmp6_ratelimit(const struct in6_addr *dst, const int type,
2819 const int code)
2820{
2821 INIT_VNET_INET6(curvnet);
2822 int ret;
2823
2824 ret = 0; /* okay to send */
2825
2826 /* PPS limit */
2827 if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2828 V_icmp6errppslim)) {
2829 /* The packet is subject to rate limit */
2830 ret++;
2831 }
2832
2833 return ret;
2834}
| 2236static const char *
2237icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
2238 struct in6_addr *tgt6)
2239{
2240 static char buf[1024];
2241 char ip6bufs[INET6_ADDRSTRLEN];
2242 char ip6bufd[INET6_ADDRSTRLEN];
2243 char ip6buft[INET6_ADDRSTRLEN];
2244 snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
2245 ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
2246 ip6_sprintf(ip6buft, tgt6));
2247 return buf;
2248}
2249
2250void
2251icmp6_redirect_input(struct mbuf *m, int off)
2252{
2253 INIT_VNET_INET6(curvnet);
2254 struct ifnet *ifp;
2255 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
2256 struct nd_redirect *nd_rd;
2257 int icmp6len = ntohs(ip6->ip6_plen);
2258 char *lladdr = NULL;
2259 int lladdrlen = 0;
2260 u_char *redirhdr = NULL;
2261 int redirhdrlen = 0;
2262 struct rtentry *rt = NULL;
2263 int is_router;
2264 int is_onlink;
2265 struct in6_addr src6 = ip6->ip6_src;
2266 struct in6_addr redtgt6;
2267 struct in6_addr reddst6;
2268 union nd_opts ndopts;
2269 char ip6buf[INET6_ADDRSTRLEN];
2270
2271 if (!m)
2272 return;
2273
2274 ifp = m->m_pkthdr.rcvif;
2275
2276 if (!ifp)
2277 return;
2278
2279 /* XXX if we are router, we don't update route by icmp6 redirect */
2280 if (V_ip6_forwarding)
2281 goto freeit;
2282 if (!V_icmp6_rediraccept)
2283 goto freeit;
2284
2285#ifndef PULLDOWN_TEST
2286 IP6_EXTHDR_CHECK(m, off, icmp6len,);
2287 nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
2288#else
2289 IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
2290 if (nd_rd == NULL) {
2291 ICMP6STAT_INC(icp6s_tooshort);
2292 return;
2293 }
2294#endif
2295 redtgt6 = nd_rd->nd_rd_target;
2296 reddst6 = nd_rd->nd_rd_dst;
2297
2298 if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
2299 in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
2300 goto freeit;
2301 }
2302
2303 /* validation */
2304 if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
2305 nd6log((LOG_ERR,
2306 "ICMP6 redirect sent from %s rejected; "
2307 "must be from linklocal\n",
2308 ip6_sprintf(ip6buf, &src6)));
2309 goto bad;
2310 }
2311 if (ip6->ip6_hlim != 255) {
2312 nd6log((LOG_ERR,
2313 "ICMP6 redirect sent from %s rejected; "
2314 "hlim=%d (must be 255)\n",
2315 ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
2316 goto bad;
2317 }
2318 {
2319 /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
2320 struct sockaddr_in6 sin6;
2321 struct in6_addr *gw6;
2322
2323 bzero(&sin6, sizeof(sin6));
2324 sin6.sin6_family = AF_INET6;
2325 sin6.sin6_len = sizeof(struct sockaddr_in6);
2326 bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
2327 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
2328 if (rt) {
2329 if (rt->rt_gateway == NULL ||
2330 rt->rt_gateway->sa_family != AF_INET6) {
2331 nd6log((LOG_ERR,
2332 "ICMP6 redirect rejected; no route "
2333 "with inet6 gateway found for redirect dst: %s\n",
2334 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2335 RTFREE_LOCKED(rt);
2336 goto bad;
2337 }
2338
2339 gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
2340 if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
2341 nd6log((LOG_ERR,
2342 "ICMP6 redirect rejected; "
2343 "not equal to gw-for-src=%s (must be same): "
2344 "%s\n",
2345 ip6_sprintf(ip6buf, gw6),
2346 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2347 RTFREE_LOCKED(rt);
2348 goto bad;
2349 }
2350 } else {
2351 nd6log((LOG_ERR,
2352 "ICMP6 redirect rejected; "
2353 "no route found for redirect dst: %s\n",
2354 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2355 goto bad;
2356 }
2357 RTFREE_LOCKED(rt);
2358 rt = NULL;
2359 }
2360 if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
2361 nd6log((LOG_ERR,
2362 "ICMP6 redirect rejected; "
2363 "redirect dst must be unicast: %s\n",
2364 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2365 goto bad;
2366 }
2367
2368 is_router = is_onlink = 0;
2369 if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
2370 is_router = 1; /* router case */
2371 if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
2372 is_onlink = 1; /* on-link destination case */
2373 if (!is_router && !is_onlink) {
2374 nd6log((LOG_ERR,
2375 "ICMP6 redirect rejected; "
2376 "neither router case nor onlink case: %s\n",
2377 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2378 goto bad;
2379 }
2380 /* validation passed */
2381
2382 icmp6len -= sizeof(*nd_rd);
2383 nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
2384 if (nd6_options(&ndopts) < 0) {
2385 nd6log((LOG_INFO, "icmp6_redirect_input: "
2386 "invalid ND option, rejected: %s\n",
2387 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2388 /* nd6_options have incremented stats */
2389 goto freeit;
2390 }
2391
2392 if (ndopts.nd_opts_tgt_lladdr) {
2393 lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
2394 lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
2395 }
2396
2397 if (ndopts.nd_opts_rh) {
2398 redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
2399 redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
2400 }
2401
2402 if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
2403 nd6log((LOG_INFO,
2404 "icmp6_redirect_input: lladdrlen mismatch for %s "
2405 "(if %d, icmp6 packet %d): %s\n",
2406 ip6_sprintf(ip6buf, &redtgt6),
2407 ifp->if_addrlen, lladdrlen - 2,
2408 icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
2409 goto bad;
2410 }
2411
2412 /* RFC 2461 8.3 */
2413 nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
2414 is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
2415
2416 if (!is_onlink) { /* better router case. perform rtredirect. */
2417 /* perform rtredirect */
2418 struct sockaddr_in6 sdst;
2419 struct sockaddr_in6 sgw;
2420 struct sockaddr_in6 ssrc;
2421
2422 bzero(&sdst, sizeof(sdst));
2423 bzero(&sgw, sizeof(sgw));
2424 bzero(&ssrc, sizeof(ssrc));
2425 sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
2426 sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
2427 sizeof(struct sockaddr_in6);
2428 bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
2429 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2430 bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
2431 rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
2432 (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
2433 (struct sockaddr *)&ssrc);
2434 }
2435 /* finally update cached route in each socket via pfctlinput */
2436 {
2437 struct sockaddr_in6 sdst;
2438
2439 bzero(&sdst, sizeof(sdst));
2440 sdst.sin6_family = AF_INET6;
2441 sdst.sin6_len = sizeof(struct sockaddr_in6);
2442 bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
2443 pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
2444#ifdef IPSEC
2445 key_sa_routechange((struct sockaddr *)&sdst);
2446#endif /* IPSEC */
2447 }
2448
2449 freeit:
2450 m_freem(m);
2451 return;
2452
2453 bad:
2454 ICMP6STAT_INC(icp6s_badredirect);
2455 m_freem(m);
2456}
2457
2458void
2459icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
2460{
2461 INIT_VNET_INET6(curvnet);
2462 struct ifnet *ifp; /* my outgoing interface */
2463 struct in6_addr *ifp_ll6;
2464 struct in6_addr *router_ll6;
2465 struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
2466 struct mbuf *m = NULL; /* newly allocated one */
2467 struct ip6_hdr *ip6; /* m as struct ip6_hdr */
2468 struct nd_redirect *nd_rd;
2469 struct llentry *ln = NULL;
2470 size_t maxlen;
2471 u_char *p;
2472 struct ifnet *outif = NULL;
2473 struct sockaddr_in6 src_sa;
2474
2475 icmp6_errcount(&V_icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
2476
2477 /* if we are not router, we don't send icmp6 redirect */
2478 if (!V_ip6_forwarding)
2479 goto fail;
2480
2481 /* sanity check */
2482 if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
2483 goto fail;
2484
2485 /*
2486 * Address check:
2487 * the source address must identify a neighbor, and
2488 * the destination address must not be a multicast address
2489 * [RFC 2461, sec 8.2]
2490 */
2491 sip6 = mtod(m0, struct ip6_hdr *);
2492 bzero(&src_sa, sizeof(src_sa));
2493 src_sa.sin6_family = AF_INET6;
2494 src_sa.sin6_len = sizeof(src_sa);
2495 src_sa.sin6_addr = sip6->ip6_src;
2496 if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
2497 goto fail;
2498 if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
2499 goto fail; /* what should we do here? */
2500
2501 /* rate limit */
2502 if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
2503 goto fail;
2504
2505 /*
2506 * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
2507 * we almost always ask for an mbuf cluster for simplicity.
2508 * (MHLEN < IPV6_MMTU is almost always true)
2509 */
2510#if IPV6_MMTU >= MCLBYTES
2511# error assumption failed about IPV6_MMTU and MCLBYTES
2512#endif
2513 MGETHDR(m, M_DONTWAIT, MT_HEADER);
2514 if (m && IPV6_MMTU >= MHLEN)
2515 MCLGET(m, M_DONTWAIT);
2516 if (!m)
2517 goto fail;
2518 m->m_pkthdr.rcvif = NULL;
2519 m->m_len = 0;
2520 maxlen = M_TRAILINGSPACE(m);
2521 maxlen = min(IPV6_MMTU, maxlen);
2522 /* just for safety */
2523 if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
2524 ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
2525 goto fail;
2526 }
2527
2528 {
2529 /* get ip6 linklocal address for ifp(my outgoing interface). */
2530 struct in6_ifaddr *ia;
2531 if ((ia = in6ifa_ifpforlinklocal(ifp,
2532 IN6_IFF_NOTREADY|
2533 IN6_IFF_ANYCAST)) == NULL)
2534 goto fail;
2535 ifp_ll6 = &ia->ia_addr.sin6_addr;
2536 }
2537
2538 /* get ip6 linklocal address for the router. */
2539 if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
2540 struct sockaddr_in6 *sin6;
2541 sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
2542 router_ll6 = &sin6->sin6_addr;
2543 if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
2544 router_ll6 = (struct in6_addr *)NULL;
2545 } else
2546 router_ll6 = (struct in6_addr *)NULL;
2547
2548 /* ip6 */
2549 ip6 = mtod(m, struct ip6_hdr *);
2550 ip6->ip6_flow = 0;
2551 ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
2552 ip6->ip6_vfc |= IPV6_VERSION;
2553 /* ip6->ip6_plen will be set later */
2554 ip6->ip6_nxt = IPPROTO_ICMPV6;
2555 ip6->ip6_hlim = 255;
2556 /* ip6->ip6_src must be linklocal addr for my outgoing if. */
2557 bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
2558 bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
2559
2560 /* ND Redirect */
2561 nd_rd = (struct nd_redirect *)(ip6 + 1);
2562 nd_rd->nd_rd_type = ND_REDIRECT;
2563 nd_rd->nd_rd_code = 0;
2564 nd_rd->nd_rd_reserved = 0;
2565 if (rt->rt_flags & RTF_GATEWAY) {
2566 /*
2567 * nd_rd->nd_rd_target must be a link-local address in
2568 * better router cases.
2569 */
2570 if (!router_ll6)
2571 goto fail;
2572 bcopy(router_ll6, &nd_rd->nd_rd_target,
2573 sizeof(nd_rd->nd_rd_target));
2574 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2575 sizeof(nd_rd->nd_rd_dst));
2576 } else {
2577 /* make sure redtgt == reddst */
2578 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
2579 sizeof(nd_rd->nd_rd_target));
2580 bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
2581 sizeof(nd_rd->nd_rd_dst));
2582 }
2583
2584 p = (u_char *)(nd_rd + 1);
2585
2586 if (!router_ll6)
2587 goto nolladdropt;
2588
2589 {
2590 /* target lladdr option */
2591 int len;
2592 struct nd_opt_hdr *nd_opt;
2593 char *lladdr;
2594
2595 IF_AFDATA_LOCK(ifp);
2596 ln = nd6_lookup(router_ll6, 0, ifp);
2597 IF_AFDATA_UNLOCK(ifp);
2598 if (ln == NULL)
2599 goto nolladdropt;
2600
2601 len = sizeof(*nd_opt) + ifp->if_addrlen;
2602 len = (len + 7) & ~7; /* round by 8 */
2603 /* safety check */
2604 if (len + (p - (u_char *)ip6) > maxlen)
2605 goto nolladdropt;
2606
2607 if (ln->la_flags & LLE_VALID) {
2608 nd_opt = (struct nd_opt_hdr *)p;
2609 nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
2610 nd_opt->nd_opt_len = len >> 3;
2611 lladdr = (char *)(nd_opt + 1);
2612 bcopy(&ln->ll_addr, lladdr, ifp->if_addrlen);
2613 p += len;
2614 }
2615 }
2616nolladdropt:
2617 if (ln != NULL)
2618 LLE_RUNLOCK(ln);
2619
2620 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2621
2622 /* just to be safe */
2623#ifdef M_DECRYPTED /*not openbsd*/
2624 if (m0->m_flags & M_DECRYPTED)
2625 goto noredhdropt;
2626#endif
2627 if (p - (u_char *)ip6 > maxlen)
2628 goto noredhdropt;
2629
2630 {
2631 /* redirected header option */
2632 int len;
2633 struct nd_opt_rd_hdr *nd_opt_rh;
2634
2635 /*
2636 * compute the maximum size for icmp6 redirect header option.
2637 * XXX room for auth header?
2638 */
2639 len = maxlen - (p - (u_char *)ip6);
2640 len &= ~7;
2641
2642 /* This is just for simplicity. */
2643 if (m0->m_pkthdr.len != m0->m_len) {
2644 if (m0->m_next) {
2645 m_freem(m0->m_next);
2646 m0->m_next = NULL;
2647 }
2648 m0->m_pkthdr.len = m0->m_len;
2649 }
2650
2651 /*
2652 * Redirected header option spec (RFC2461 4.6.3) talks nothing
2653 * about padding/truncate rule for the original IP packet.
2654 * From the discussion on IPv6imp in Feb 1999,
2655 * the consensus was:
2656 * - "attach as much as possible" is the goal
2657 * - pad if not aligned (original size can be guessed by
2658 * original ip6 header)
2659 * Following code adds the padding if it is simple enough,
2660 * and truncates if not.
2661 */
2662 if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
2663 panic("assumption failed in %s:%d", __FILE__,
2664 __LINE__);
2665
2666 if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
2667 /* not enough room, truncate */
2668 m0->m_pkthdr.len = m0->m_len = len -
2669 sizeof(*nd_opt_rh);
2670 } else {
2671 /* enough room, pad or truncate */
2672 size_t extra;
2673
2674 extra = m0->m_pkthdr.len % 8;
2675 if (extra) {
2676 /* pad if easy enough, truncate if not */
2677 if (8 - extra <= M_TRAILINGSPACE(m0)) {
2678 /* pad */
2679 m0->m_len += (8 - extra);
2680 m0->m_pkthdr.len += (8 - extra);
2681 } else {
2682 /* truncate */
2683 m0->m_pkthdr.len -= extra;
2684 m0->m_len -= extra;
2685 }
2686 }
2687 len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
2688 m0->m_pkthdr.len = m0->m_len = len -
2689 sizeof(*nd_opt_rh);
2690 }
2691
2692 nd_opt_rh = (struct nd_opt_rd_hdr *)p;
2693 bzero(nd_opt_rh, sizeof(*nd_opt_rh));
2694 nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
2695 nd_opt_rh->nd_opt_rh_len = len >> 3;
2696 p += sizeof(*nd_opt_rh);
2697 m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
2698
2699 /* connect m0 to m */
2700 m_tag_delete_chain(m0, NULL);
2701 m0->m_flags &= ~M_PKTHDR;
2702 m->m_next = m0;
2703 m->m_pkthdr.len = m->m_len + m0->m_len;
2704 m0 = NULL;
2705 }
2706noredhdropt:;
2707 if (m0) {
2708 m_freem(m0);
2709 m0 = NULL;
2710 }
2711
2712 /* XXX: clear embedded link IDs in the inner header */
2713 in6_clearscope(&sip6->ip6_src);
2714 in6_clearscope(&sip6->ip6_dst);
2715 in6_clearscope(&nd_rd->nd_rd_target);
2716 in6_clearscope(&nd_rd->nd_rd_dst);
2717
2718 ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
2719
2720 nd_rd->nd_rd_cksum = 0;
2721 nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
2722 sizeof(*ip6), ntohs(ip6->ip6_plen));
2723
2724 /* send the packet to outside... */
2725 ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
2726 if (outif) {
2727 icmp6_ifstat_inc(outif, ifs6_out_msg);
2728 icmp6_ifstat_inc(outif, ifs6_out_redirect);
2729 }
2730 ICMP6STAT_INC(icp6s_outhist[ND_REDIRECT]);
2731
2732 return;
2733
2734fail:
2735 if (m)
2736 m_freem(m);
2737 if (m0)
2738 m_freem(m0);
2739}
2740
2741/*
2742 * ICMPv6 socket option processing.
2743 */
2744int
2745icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
2746{
2747 int error = 0;
2748 int optlen;
2749 struct inpcb *inp = sotoinpcb(so);
2750 int level, op, optname;
2751
2752 if (sopt) {
2753 level = sopt->sopt_level;
2754 op = sopt->sopt_dir;
2755 optname = sopt->sopt_name;
2756 optlen = sopt->sopt_valsize;
2757 } else
2758 level = op = optname = optlen = 0;
2759
2760 if (level != IPPROTO_ICMPV6) {
2761 return EINVAL;
2762 }
2763
2764 switch (op) {
2765 case PRCO_SETOPT:
2766 switch (optname) {
2767 case ICMP6_FILTER:
2768 {
2769 struct icmp6_filter ic6f;
2770
2771 if (optlen != sizeof(ic6f)) {
2772 error = EMSGSIZE;
2773 break;
2774 }
2775 error = sooptcopyin(sopt, &ic6f, optlen, optlen);
2776 if (error == 0) {
2777 INP_WLOCK(inp);
2778 *inp->in6p_icmp6filt = ic6f;
2779 INP_WUNLOCK(inp);
2780 }
2781 break;
2782 }
2783
2784 default:
2785 error = ENOPROTOOPT;
2786 break;
2787 }
2788 break;
2789
2790 case PRCO_GETOPT:
2791 switch (optname) {
2792 case ICMP6_FILTER:
2793 {
2794 struct icmp6_filter ic6f;
2795
2796 INP_RLOCK(inp);
2797 ic6f = *inp->in6p_icmp6filt;
2798 INP_RUNLOCK(inp);
2799 error = sooptcopyout(sopt, &ic6f, sizeof(ic6f));
2800 break;
2801 }
2802
2803 default:
2804 error = ENOPROTOOPT;
2805 break;
2806 }
2807 break;
2808 }
2809
2810 return (error);
2811}
2812
2813/*
2814 * Perform rate limit check.
2815 * Returns 0 if it is okay to send the icmp6 packet.
2816 * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
2817 * limitation.
2818 *
2819 * XXX per-destination/type check necessary?
2820 *
2821 * dst - not used at this moment
2822 * type - not used at this moment
2823 * code - not used at this moment
2824 */
2825static int
2826icmp6_ratelimit(const struct in6_addr *dst, const int type,
2827 const int code)
2828{
2829 INIT_VNET_INET6(curvnet);
2830 int ret;
2831
2832 ret = 0; /* okay to send */
2833
2834 /* PPS limit */
2835 if (!ppsratecheck(&V_icmp6errppslim_last, &V_icmp6errpps_count,
2836 V_icmp6errppslim)) {
2837 /* The packet is subject to rate limit */
2838 ret++;
2839 }
2840
2841 return ret;
2842}
|