1/* $NetBSD: if_stf.c,v 1.99 2016/08/18 11:38:58 knakahara Exp $ */
2/* $KAME: if_stf.c,v 1.62 2001/06/07 22:32:16 itojun Exp $ */
3
4/*
5 * Copyright (C) 2000 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33/*
34 * 6to4 interface, based on RFC3056.
35 *
36 * 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting.
37 * There is no address mapping defined from IPv6 multicast address to IPv4
38 * address. Therefore, we do not have IFF_MULTICAST on the interface.
39 *
40 * Due to the lack of address mapping for link-local addresses, we cannot
41 * throw packets toward link-local addresses (fe80::x). Also, we cannot throw
42 * packets to link-local multicast addresses (ff02::x).
43 *
44 * Here are interesting symptoms due to the lack of link-local address:
45 *
46 * Unicast routing exchange:
47 * - RIPng: Impossible. Uses link-local multicast packet toward ff02::9,
48 * and link-local addresses as nexthop.
49 * - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address
50 * assigned to the link, and makes use of them. Also, HELLO packets use
51 * link-local multicast addresses (ff02::5 and ff02::6).
52 * - BGP4+: Maybe. You can only use global address as nexthop, and global
53 * address as TCP endpoint address.
54 *
55 * Multicast routing protocols:
56 * - PIM: Hello packet cannot be used to discover adjacent PIM routers.
57 * Adjacent PIM routers must be configured manually (is it really spec-wise
58 * correct thing to do?).
59 *
60 * ICMPv6:
61 * - Redirects cannot be used due to the lack of link-local address.
62 *
63 * stf interface does not have, and will not need, a link-local address.
64 * It seems to have no real benefit and does not help the above symptoms much.
65 * Even if we assign link-locals to interface, we cannot really
66 * use link-local unicast/multicast on top of 6to4 cloud (since there's no
67 * encapsulation defined for link-local address), and the above analysis does
68 * not change. RFC3056 does not mandate the assignment of link-local address
69 * either.
70 *
71 * 6to4 interface has security issues. Refer to
72 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt
73 * for details. The code tries to filter out some of malicious packets.
74 * Note that there is no way to be 100% secure.
75 */
76
77#include <sys/cdefs.h>
78__KERNEL_RCSID(0, "$NetBSD: if_stf.c,v 1.99 2016/08/18 11:38:58 knakahara Exp $");
79
80#ifdef _KERNEL_OPT
81#include "opt_inet.h"
82#include "stf.h"
83#endif
84
85#ifndef INET6
86 #error "pseudo-device stf requires options INET6"
87#endif
88
89#include <sys/param.h>
90#include <sys/systm.h>
91#include <sys/socket.h>
92#include <sys/sockio.h>
93#include <sys/mbuf.h>
94#include <sys/errno.h>
95#include <sys/ioctl.h>
96#include <sys/proc.h>
97#include <sys/queue.h>
98#include <sys/syslog.h>
99#include <sys/device.h>
100#include <sys/module.h>
101
102#include <sys/cpu.h>
103
104#include <net/if.h>
105#include <net/route.h>
106#include <net/netisr.h>
107#include <net/if_types.h>
108#include <net/if_stf.h>
109
110#include <netinet/in.h>
111#include <netinet/in_systm.h>
112#include <netinet/ip.h>
113#include <netinet/ip_var.h>
114#include <netinet/in_var.h>
115
116#include <netinet/ip6.h>
117#include <netinet6/ip6_var.h>
118#include <netinet6/in6_var.h>
119#include <netinet/ip_ecn.h>
120
121#include <netinet/ip_encap.h>
122
123#include <net/net_osdep.h>
124
125#include <net/bpf.h>
126
127#include "ioconf.h"
128
129#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
130#define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1]))
131
132struct stf_softc {
133 struct ifnet sc_if; /* common area */
134 struct route sc_ro;
135 const struct encaptab *encap_cookie;
136 LIST_ENTRY(stf_softc) sc_list;
137};
138
139static LIST_HEAD(, stf_softc) stf_softc_list;
140
141static int stf_clone_create(struct if_clone *, int);
142static int stf_clone_destroy(struct ifnet *);
143
144struct if_clone stf_cloner =
145 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy);
146
147static int ip_stf_ttl = STF_TTL;
148
149extern struct domain inetdomain;
150
151static const struct encapsw in_stf_encapsw =
152{
153 .encapsw4 = {
154 .pr_input = in_stf_input,
155 .pr_ctlinput = NULL,
156 }
157};
158
159static int stf_encapcheck(struct mbuf *, int, int, void *);
160static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *);
161static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
162 const struct rtentry *);
163static int isrfc1918addr(const struct in_addr *);
164static int stf_checkaddr4(struct stf_softc *, const struct in_addr *,
165 struct ifnet *);
166static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *,
167 struct ifnet *);
168static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *);
169static int stf_ioctl(struct ifnet *, u_long, void *);
170
171/* ARGSUSED */
172void
173stfattach(int count)
174{
175
176 /*
177 * Nothing to do here, initialization is handled by the
178 * module initialization code in stfinit() below).
179 */
180}
181
182static void
183stfinit(void)
184{
185
186 LIST_INIT(&stf_softc_list);
187 if_clone_attach(&stf_cloner);
188}
189
190static int
191stfdetach(void)
192{
193 int error = 0;
194
195 if (!LIST_EMPTY(&stf_softc_list))
196 error = EBUSY;
197
198 if (error == 0)
199 if_clone_detach(&stf_cloner);
200
201 return error;
202}
203
204static int
205stf_clone_create(struct if_clone *ifc, int unit)
206{
207 struct stf_softc *sc;
208 int error;
209
210 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO);
211 if_initname(&sc->sc_if, ifc->ifc_name, unit);
212
213 error = encap_lock_enter();
214 if (error) {
215 free(sc, M_DEVBUF);
216 return error;
217 }
218
219 if (LIST_FIRST(&stf_softc_list) != NULL) {
220 /* Only one stf interface is allowed. */
221 encap_lock_exit();
222 free(sc, M_DEVBUF);
223 return (EEXIST);
224 }
225
226 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6,
227 stf_encapcheck, &in_stf_encapsw, sc);
228 encap_lock_exit();
229 if (sc->encap_cookie == NULL) {
230 printf("%s: unable to attach encap\n", if_name(&sc->sc_if));
231 free(sc, M_DEVBUF);
232 return (EIO); /* XXX */
233 }
234
235 sc->sc_if.if_mtu = STF_MTU;
236 sc->sc_if.if_flags = 0;
237 sc->sc_if.if_ioctl = stf_ioctl;
238 sc->sc_if.if_output = stf_output;
239 sc->sc_if.if_type = IFT_STF;
240 sc->sc_if.if_dlt = DLT_NULL;
241 if_attach(&sc->sc_if);
242 if_alloc_sadl(&sc->sc_if);
243 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int));
244 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list);
245 return (0);
246}
247
248static int
249stf_clone_destroy(struct ifnet *ifp)
250{
251 struct stf_softc *sc = (void *) ifp;
252
253 encap_lock_enter();
254 LIST_REMOVE(sc, sc_list);
255 encap_detach(sc->encap_cookie);
256 encap_lock_exit();
257 bpf_detach(ifp);
258 if_detach(ifp);
259 rtcache_free(&sc->sc_ro);
260 free(sc, M_DEVBUF);
261
262 return (0);
263}
264
265static int
266stf_encapcheck(struct mbuf *m, int off, int proto, void *arg)
267{
268 struct ip ip;
269 struct in6_ifaddr *ia6;
270 struct stf_softc *sc;
271 struct in_addr a, b;
272
273 sc = (struct stf_softc *)arg;
274 if (sc == NULL)
275 return 0;
276
277 if ((sc->sc_if.if_flags & IFF_UP) == 0)
278 return 0;
279
280 /* IFF_LINK0 means "no decapsulation" */
281 if ((sc->sc_if.if_flags & IFF_LINK0) != 0)
282 return 0;
283
284 if (proto != IPPROTO_IPV6)
285 return 0;
286
287 m_copydata(m, 0, sizeof(ip), (void *)&ip);
288
289 if (ip.ip_v != 4)
290 return 0;
291
292 ia6 = stf_getsrcifa6(&sc->sc_if);
293 if (ia6 == NULL)
294 return 0;
295
296 /*
297 * check if IPv4 dst matches the IPv4 address derived from the
298 * local 6to4 address.
299 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
300 */
301 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
302 sizeof(ip.ip_dst)) != 0)
303 return 0;
304
305 /*
306 * check if IPv4 src matches the IPv4 address derived from the
307 * local 6to4 address masked by prefixmask.
308 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
309 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
310 */
311 memset(&a, 0, sizeof(a));
312 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr;
313 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
314 b = ip.ip_src;
315 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
316 if (a.s_addr != b.s_addr)
317 return 0;
318
319 /* stf interface makes single side match only */
320 return 32;
321}
322
323static struct in6_ifaddr *
324stf_getsrcifa6(struct ifnet *ifp)
325{
326 struct ifaddr *ifa;
327 struct in_ifaddr *ia4;
328 struct sockaddr_in6 *sin6;
329 struct in_addr in;
330 int s;
331
332 s = pserialize_read_enter();
333 IFADDR_READER_FOREACH(ifa, ifp) {
334 if (ifa->ifa_addr->sa_family != AF_INET6)
335 continue;
336 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
337 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
338 continue;
339
340 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in));
341 ia4 = in_get_ia(in);
342 if (ia4 == NULL)
343 continue;
344
345 pserialize_read_exit(s);
346 /* TODO NOMPSAFE */
347 return (struct in6_ifaddr *)ifa;
348 }
349 pserialize_read_exit(s);
350
351 return NULL;
352}
353
354static int
355stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
356 const struct rtentry *rt0)
357{
358 struct rtentry *rt;
359 struct stf_softc *sc;
360 const struct sockaddr_in6 *dst6;
361 const struct in_addr *in4;
362 uint8_t tos;
363 struct ip *ip;
364 struct ip6_hdr *ip6;
365 struct in6_ifaddr *ia6;
366 union {
367 struct sockaddr dst;
368 struct sockaddr_in dst4;
369 } u;
370
371 sc = (struct stf_softc*)ifp;
372 dst6 = (const struct sockaddr_in6 *)dst;
373
374 /* just in case */
375 if ((ifp->if_flags & IFF_UP) == 0) {
376 m_freem(m);
377 return ENETDOWN;
378 }
379
380 /*
381 * If we don't have an ip4 address that match my inner ip6 address,
382 * we shouldn't generate output. Without this check, we'll end up
383 * using wrong IPv4 source.
384 */
385 ia6 = stf_getsrcifa6(ifp);
386 if (ia6 == NULL) {
387 m_freem(m);
388 ifp->if_oerrors++;
389 return ENETDOWN;
390 }
391
392 if (m->m_len < sizeof(*ip6)) {
393 m = m_pullup(m, sizeof(*ip6));
394 if (m == NULL) {
395 ifp->if_oerrors++;
396 return ENOBUFS;
397 }
398 }
399 ip6 = mtod(m, struct ip6_hdr *);
400 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
401
402 /*
403 * Pickup the right outer dst addr from the list of candidates.
404 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
405 */
406 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
407 in4 = GET_V4(&ip6->ip6_dst);
408 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
409 in4 = GET_V4(&dst6->sin6_addr);
410 else {
411 m_freem(m);
412 ifp->if_oerrors++;
413 return ENETUNREACH;
414 }
415
416 bpf_mtap_af(ifp, AF_INET6, m);
417
418 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
419 if (m && m->m_len < sizeof(struct ip))
420 m = m_pullup(m, sizeof(struct ip));
421 if (m == NULL) {
422 ifp->if_oerrors++;
423 return ENOBUFS;
424 }
425 ip = mtod(m, struct ip *);
426
427 memset(ip, 0, sizeof(*ip));
428
429 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
430 &ip->ip_src, sizeof(ip->ip_src));
431 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst));
432 ip->ip_p = IPPROTO_IPV6;
433 ip->ip_ttl = ip_stf_ttl;
434 ip->ip_len = htons(m->m_pkthdr.len);
435 if (ifp->if_flags & IFF_LINK1)
436 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
437 else
438 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
439
440 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
441 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) {
442 m_freem(m);
443 ifp->if_oerrors++;
444 return ENETUNREACH;
445 }
446
447 /* If the route constitutes infinite encapsulation, punt. */
448 if (rt->rt_ifp == ifp) {
449 rtcache_free(&sc->sc_ro);
450 m_freem(m);
451 ifp->if_oerrors++;
452 return ENETUNREACH;
453 }
454
455 ifp->if_opackets++;
456 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip);
457 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
458}
459
460static int
461isrfc1918addr(const struct in_addr *in)
462{
463 /*
464 * returns 1 if private address range:
465 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
466 */
467 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 ||
468 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 ||
469 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)
470 return 1;
471
472 return 0;
473}
474
475static int
476stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in,
477 struct ifnet *inifp /*incoming interface*/)
478{
479 struct in_ifaddr *ia4;
480
481 /*
482 * reject packets with the following address:
483 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
484 */
485 if (IN_MULTICAST(in->s_addr))
486 return -1;
487 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
488 case 0: case 127: case 255:
489 return -1;
490 }
491
492 /*
493 * reject packets with private address range.
494 * (requirement from RFC3056 section 2 1st paragraph)
495 */
496 if (isrfc1918addr(in))
497 return -1;
498
499 /*
500 * reject packet with IPv4 link-local (169.254.0.0/16),
501 * as suggested in draft-savola-v6ops-6to4-security-00.txt
502 */
503 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 &&
504 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254)
505 return -1;
506
507 /*
508 * reject packets with broadcast
509 */
510 IN_ADDRLIST_READER_FOREACH(ia4) {
511 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
512 continue;
513 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
514 return -1;
515 }
516
517 /*
518 * perform ingress filter
519 */
520 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) {
521 struct sockaddr_in sin;
522 struct rtentry *rt;
523
524 memset(&sin, 0, sizeof(sin));
525 sin.sin_family = AF_INET;
526 sin.sin_len = sizeof(struct sockaddr_in);
527 sin.sin_addr = *in;
528 rt = rtalloc1((struct sockaddr *)&sin, 0);
529 if (!rt || rt->rt_ifp != inifp) {
530#if 0
531 log(LOG_WARNING, "%s: packet from 0x%x dropped "
532 "due to ingress filter\n", if_name(&sc->sc_if),
533 (uint32_t)ntohl(sin.sin_addr.s_addr));
534#endif
535 if (rt)
536 rtfree(rt);
537 return -1;
538 }
539 rtfree(rt);
540 }
541
542 return 0;
543}
544
545static int
546stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6,
547 struct ifnet *inifp /*incoming interface*/)
548{
549
550 /*
551 * check 6to4 addresses
552 */
553 if (IN6_IS_ADDR_6TO4(in6))
554 return stf_checkaddr4(sc, GET_V4(in6), inifp);
555
556 /*
557 * reject anything that look suspicious. the test is implemented
558 * in ip6_input too, but we check here as well to
559 * (1) reject bad packets earlier, and
560 * (2) to be safe against future ip6_input change.
561 */
562 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
563 return -1;
564
565 /*
566 * reject link-local and site-local unicast
567 * as suggested in draft-savola-v6ops-6to4-security-00.txt
568 */
569 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6))
570 return -1;
571
572 /*
573 * reject node-local and link-local multicast
574 * as suggested in draft-savola-v6ops-6to4-security-00.txt
575 */
576 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6))
577 return -1;
578
579 return 0;
580}
581
582void
583in_stf_input(struct mbuf *m, int off, int proto)
584{
585 int s;
586 struct stf_softc *sc;
587 struct ip *ip;
588 struct ip6_hdr *ip6;
589 uint8_t otos, itos;
590 struct ifnet *ifp;
591 size_t pktlen;
592
593 if (proto != IPPROTO_IPV6) {
594 m_freem(m);
595 return;
596 }
597
598 ip = mtod(m, struct ip *);
599
600 sc = (struct stf_softc *)encap_getarg(m);
601
602 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) {
603 m_freem(m);
604 return;
605 }
606
607 ifp = &sc->sc_if;
608
609 /*
610 * perform sanity check against outer src/dst.
611 * for source, perform ingress filter as well.
612 */
613 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
614 stf_checkaddr4(sc, &ip->ip_src, m_get_rcvif_NOMPSAFE(m)) < 0) {
615 m_freem(m);
616 return;
617 }
618
619 otos = ip->ip_tos;
620 m_adj(m, off);
621
622 if (m->m_len < sizeof(*ip6)) {
623 m = m_pullup(m, sizeof(*ip6));
624 if (!m)
625 return;
626 }
627 ip6 = mtod(m, struct ip6_hdr *);
628
629 /*
630 * perform sanity check against inner src/dst.
631 * for source, perform ingress filter as well.
632 */
633 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
634 stf_checkaddr6(sc, &ip6->ip6_src, m_get_rcvif_NOMPSAFE(m)) < 0) {
635 m_freem(m);
636 return;
637 }
638
639 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
640 if ((ifp->if_flags & IFF_LINK1) != 0)
641 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
642 else
643 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
644 ip6->ip6_flow &= ~htonl(0xff << 20);
645 ip6->ip6_flow |= htonl((uint32_t)itos << 20);
646
647 pktlen = m->m_pkthdr.len;
648 m_set_rcvif(m, ifp);
649
650 bpf_mtap_af(ifp, AF_INET6, m);
651
652 /*
653 * Put the packet to the network layer input queue according to the
654 * specified address family.
655 * See net/if_gif.c for possible issues with packet processing
656 * reorder due to extra queueing.
657 */
658
659 s = splnet();
660 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) {
661 ifp->if_ipackets++;
662 ifp->if_ibytes += pktlen;
663 } else {
664 m_freem(m);
665 }
666 splx(s);
667
668 return;
669}
670
671/* ARGSUSED */
672static void
673stf_rtrequest(int cmd, struct rtentry *rt,
674 const struct rt_addrinfo *info)
675{
676 if (rt != NULL) {
677 struct stf_softc *sc;
678
679 sc = LIST_FIRST(&stf_softc_list);
680 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU;
681 }
682}
683
684static int
685stf_ioctl(struct ifnet *ifp, u_long cmd, void *data)
686{
687 struct ifaddr *ifa;
688 struct ifreq *ifr = data;
689 struct sockaddr_in6 *sin6;
690 int error;
691
692 error = 0;
693 switch (cmd) {
694 case SIOCINITIFADDR:
695 ifa = (struct ifaddr *)data;
696 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
697 error = EAFNOSUPPORT;
698 break;
699 }
700 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
701 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) &&
702 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) {
703 ifa->ifa_rtrequest = stf_rtrequest;
704 ifp->if_flags |= IFF_UP;
705 } else
706 error = EINVAL;
707 break;
708
709 case SIOCADDMULTI:
710 case SIOCDELMULTI:
711 if (ifr != NULL &&
712 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6)
713 ;
714 else
715 error = EAFNOSUPPORT;
716 break;
717
718 case SIOCSIFMTU:
719 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX)
720 return EINVAL;
721 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
722 error = 0;
723 break;
724
725 default:
726 error = ifioctl_common(ifp, cmd, data);
727 break;
728 }
729
730 return error;
731}
732
733/*
734 * Module infrastructure
735 */
736#include "if_module.h"
737
738IF_MODULE(MODULE_CLASS_DRIVER, stf, "")
739