__P() removal
[dragonfly.git] / sys / net / stf / if_stf.c
CommitLineData
984263bc 1/* $FreeBSD: src/sys/net/if_stf.c,v 1.1.2.11 2003/01/23 21:06:44 sam Exp $ */
158abb01 2/* $DragonFly: src/sys/net/stf/if_stf.c,v 1.5 2003/08/26 20:49:49 rob Exp $ */
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3/* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi Exp $ */
4
5/*
6 * Copyright (C) 2000 WIDE Project.
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34/*
35 * 6to4 interface, based on RFC3056.
36 *
37 * 6to4 interface is NOT capable of link-layer (I mean, IPv4) multicasting.
38 * There is no address mapping defined from IPv6 multicast address to IPv4
39 * address. Therefore, we do not have IFF_MULTICAST on the interface.
40 *
41 * Due to the lack of address mapping for link-local addresses, we cannot
42 * throw packets toward link-local addresses (fe80::x). Also, we cannot throw
43 * packets to link-local multicast addresses (ff02::x).
44 *
45 * Here are interesting symptoms due to the lack of link-local address:
46 *
47 * Unicast routing exchange:
48 * - RIPng: Impossible. Uses link-local multicast packet toward ff02::9,
49 * and link-local addresses as nexthop.
50 * - OSPFv6: Impossible. OSPFv6 assumes that there's link-local address
51 * assigned to the link, and makes use of them. Also, HELLO packets use
52 * link-local multicast addresses (ff02::5 and ff02::6).
53 * - BGP4+: Maybe. You can only use global address as nexthop, and global
54 * address as TCP endpoint address.
55 *
56 * Multicast routing protocols:
57 * - PIM: Hello packet cannot be used to discover adjacent PIM routers.
58 * Adjacent PIM routers must be configured manually (is it really spec-wise
59 * correct thing to do?).
60 *
61 * ICMPv6:
62 * - Redirects cannot be used due to the lack of link-local address.
63 *
64 * stf interface does not have, and will not need, a link-local address.
65 * It seems to have no real benefit and does not help the above symptoms much.
66 * Even if we assign link-locals to interface, we cannot really
67 * use link-local unicast/multicast on top of 6to4 cloud (since there's no
68 * encapsulation defined for link-local address), and the above analysis does
69 * not change. RFC3056 does not mandate the assignment of link-local address
70 * either.
71 *
72 * 6to4 interface has security issues. Refer to
73 * http://playground.iijlab.net/i-d/draft-itojun-ipv6-transition-abuse-00.txt
74 * for details. The code tries to filter out some of malicious packets.
75 * Note that there is no way to be 100% secure.
76 */
77
78#include "opt_inet.h"
79#include "opt_inet6.h"
80
81#include <sys/param.h>
82#include <sys/systm.h>
83#include <sys/socket.h>
84#include <sys/sockio.h>
85#include <sys/mbuf.h>
86#include <sys/errno.h>
87#include <sys/protosw.h>
88#include <sys/kernel.h>
89#include <machine/cpu.h>
90
91#include <sys/malloc.h>
92
93#include <net/if.h>
94#include <net/route.h>
95#include <net/netisr.h>
96#include <net/if_types.h>
1f2de5d4 97#include "if_stf.h"
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98
99#include <netinet/in.h>
100#include <netinet/in_systm.h>
101#include <netinet/ip.h>
102#include <netinet/ipprotosw.h>
103#include <netinet/ip_var.h>
104#include <netinet/in_var.h>
105
106#include <netinet/ip6.h>
107#include <netinet6/ip6_var.h>
108#include <netinet6/in6_var.h>
109#include <netinet/ip_ecn.h>
110
111#include <netinet/ip_encap.h>
112
113#include <machine/stdarg.h>
114
115#include <net/net_osdep.h>
116
117#include <net/bpf.h>
118
119#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
120#define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1]))
121
122struct stf_softc {
123 struct ifnet sc_if; /* common area */
124 union {
125 struct route __sc_ro4;
126 struct route_in6 __sc_ro6; /* just for safety */
127 } __sc_ro46;
128#define sc_ro __sc_ro46.__sc_ro4
129 const struct encaptab *encap_cookie;
130};
131
132static struct stf_softc *stf;
133
134static MALLOC_DEFINE(M_STF, "stf", "6to4 Tunnel Interface");
135static int ip_stf_ttl = 40;
136
137extern struct domain inetdomain;
138struct ipprotosw in_stf_protosw =
139{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR,
140 in_stf_input, rip_output, 0, rip_ctloutput,
141 0,
142 0, 0, 0, 0,
143 &rip_usrreqs
144};
145
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146static int stfmodevent (module_t, int, void *);
147static int stf_encapcheck (const struct mbuf *, int, int, void *);
148static struct in6_ifaddr *stf_getsrcifa6 (struct ifnet *);
149static int stf_output (struct ifnet *, struct mbuf *, struct sockaddr *,
150 struct rtentry *);
151static int stf_checkaddr4 (struct stf_softc *, struct in_addr *,
152 struct ifnet *);
153static int stf_checkaddr6 (struct stf_softc *, struct in6_addr *,
154 struct ifnet *);
155static void stf_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
156static int stf_ioctl (struct ifnet *, u_long, caddr_t);
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157
158static int
159stfmodevent(mod, type, data)
160 module_t mod;
161 int type;
162 void *data;
163{
164 struct stf_softc *sc;
165 int err;
166 const struct encaptab *p;
167
168 switch (type) {
169 case MOD_LOAD:
170 stf = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK);
171 bzero(stf, sizeof(struct stf_softc));
172 sc = stf;
173
174 bzero(sc, sizeof(*sc));
175 sc->sc_if.if_name = "stf";
176 sc->sc_if.if_unit = 0;
177
178 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck,
f15db79e 179 (void *)&in_stf_protosw, sc);
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180 if (p == NULL) {
181 printf("%s: attach failed\n", if_name(&sc->sc_if));
182 return (ENOMEM);
183 }
184 sc->encap_cookie = p;
185
186 sc->sc_if.if_mtu = IPV6_MMTU;
187 sc->sc_if.if_flags = 0;
188 sc->sc_if.if_ioctl = stf_ioctl;
189 sc->sc_if.if_output = stf_output;
190 sc->sc_if.if_type = IFT_STF;
191#if 0
192 /* turn off ingress filter */
193 sc->sc_if.if_flags |= IFF_LINK2;
194#endif
195 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
196 if_attach(&sc->sc_if);
197#ifdef HAVE_OLD_BPF
198 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
199#else
200 bpfattach(&sc->sc_if.if_bpf, &sc->sc_if, DLT_NULL, sizeof(u_int));
201#endif
202 break;
203 case MOD_UNLOAD:
204 sc = stf;
205 bpfdetach(&sc->sc_if);
206 if_detach(&sc->sc_if);
207 err = encap_detach(sc->encap_cookie);
208 KASSERT(err == 0, ("Unexpected error detaching encap_cookie"));
209 free(sc, M_STF);
210 break;
211 }
212
213 return (0);
214}
215
216static moduledata_t stf_mod = {
217 "if_stf",
218 stfmodevent,
219 0
220};
221
222DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
223
224static int
225stf_encapcheck(m, off, proto, arg)
226 const struct mbuf *m;
227 int off;
228 int proto;
229 void *arg;
230{
231 struct ip ip;
232 struct in6_ifaddr *ia6;
233 struct stf_softc *sc;
234 struct in_addr a, b;
235
236 sc = (struct stf_softc *)arg;
237 if (sc == NULL)
238 return 0;
239
240 if ((sc->sc_if.if_flags & IFF_UP) == 0)
241 return 0;
242
243 /* IFF_LINK0 means "no decapsulation" */
244 if ((sc->sc_if.if_flags & IFF_LINK0) != 0)
245 return 0;
246
247 if (proto != IPPROTO_IPV6)
248 return 0;
249
f15db79e 250 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
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251
252 if (ip.ip_v != 4)
253 return 0;
254
255 ia6 = stf_getsrcifa6(&sc->sc_if);
256 if (ia6 == NULL)
257 return 0;
258
259 /*
260 * check if IPv4 dst matches the IPv4 address derived from the
261 * local 6to4 address.
262 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
263 */
264 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
265 sizeof(ip.ip_dst)) != 0)
266 return 0;
267
268 /*
269 * check if IPv4 src matches the IPv4 address derived from the
270 * local 6to4 address masked by prefixmask.
271 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
272 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
273 */
274 bzero(&a, sizeof(a));
275 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr;
276 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
277 b = ip.ip_src;
278 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
279 if (a.s_addr != b.s_addr)
280 return 0;
281
282 /* stf interface makes single side match only */
283 return 32;
284}
285
286static struct in6_ifaddr *
287stf_getsrcifa6(ifp)
288 struct ifnet *ifp;
289{
290 struct ifaddr *ia;
291 struct in_ifaddr *ia4;
292 struct sockaddr_in6 *sin6;
293 struct in_addr in;
294
295 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) {
296 if (ia->ifa_addr == NULL)
297 continue;
298 if (ia->ifa_addr->sa_family != AF_INET6)
299 continue;
300 sin6 = (struct sockaddr_in6 *)ia->ifa_addr;
301 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
302 continue;
303
304 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
305 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash)
306 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr)
307 break;
308 if (ia4 == NULL)
309 continue;
310
311 return (struct in6_ifaddr *)ia;
312 }
313
314 return NULL;
315}
316
317static int
318stf_output(ifp, m, dst, rt)
319 struct ifnet *ifp;
320 struct mbuf *m;
321 struct sockaddr *dst;
322 struct rtentry *rt;
323{
324 struct stf_softc *sc;
325 struct sockaddr_in6 *dst6;
326 struct in_addr *in4;
327 struct sockaddr_in *dst4;
328 u_int8_t tos;
329 struct ip *ip;
330 struct ip6_hdr *ip6;
331 struct in6_ifaddr *ia6;
332
333 sc = (struct stf_softc*)ifp;
334 dst6 = (struct sockaddr_in6 *)dst;
335
336 /* just in case */
337 if ((ifp->if_flags & IFF_UP) == 0) {
338 m_freem(m);
339 return ENETDOWN;
340 }
341
342 /*
343 * If we don't have an ip4 address that match my inner ip6 address,
344 * we shouldn't generate output. Without this check, we'll end up
345 * using wrong IPv4 source.
346 */
347 ia6 = stf_getsrcifa6(ifp);
348 if (ia6 == NULL) {
349 m_freem(m);
350 return ENETDOWN;
351 }
352
353 if (m->m_len < sizeof(*ip6)) {
354 m = m_pullup(m, sizeof(*ip6));
355 if (!m)
356 return ENOBUFS;
357 }
358 ip6 = mtod(m, struct ip6_hdr *);
359 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
360
361 /*
362 * Pickup the right outer dst addr from the list of candidates.
363 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
364 */
365 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
366 in4 = GET_V4(&ip6->ip6_dst);
367 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
368 in4 = GET_V4(&dst6->sin6_addr);
369 else {
370 m_freem(m);
371 return ENETUNREACH;
372 }
373
374#if NBPFILTER > 0
375 if (ifp->if_bpf) {
376 /*
377 * We need to prepend the address family as
378 * a four byte field. Cons up a dummy header
379 * to pacify bpf. This is safe because bpf
380 * will only read from the mbuf (i.e., it won't
381 * try to free it or keep a pointer a to it).
382 */
383 struct mbuf m0;
384 u_int32_t af = AF_INET6;
385
386 m0.m_next = m;
387 m0.m_len = 4;
388 m0.m_data = (char *)&af;
389
390#ifdef HAVE_OLD_BPF
391 bpf_mtap(ifp, &m0);
392#else
393 bpf_mtap(ifp->if_bpf, &m0);
394#endif
395 }
396#endif /*NBPFILTER > 0*/
397
398 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
399 if (m && m->m_len < sizeof(struct ip))
400 m = m_pullup(m, sizeof(struct ip));
401 if (m == NULL)
402 return ENOBUFS;
403 ip = mtod(m, struct ip *);
404
405 bzero(ip, sizeof(*ip));
406
407 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
408 &ip->ip_src, sizeof(ip->ip_src));
409 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst));
410 ip->ip_p = IPPROTO_IPV6;
411 ip->ip_ttl = ip_stf_ttl;
412 ip->ip_len = m->m_pkthdr.len; /*host order*/
413 if (ifp->if_flags & IFF_LINK1)
414 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
415 else
416 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
417
418 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst;
419 if (dst4->sin_family != AF_INET ||
420 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) {
421 /* cache route doesn't match */
422 dst4->sin_family = AF_INET;
423 dst4->sin_len = sizeof(struct sockaddr_in);
424 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr));
425 if (sc->sc_ro.ro_rt) {
426 RTFREE(sc->sc_ro.ro_rt);
427 sc->sc_ro.ro_rt = NULL;
428 }
429 }
430
431 if (sc->sc_ro.ro_rt == NULL) {
432 rtalloc(&sc->sc_ro);
433 if (sc->sc_ro.ro_rt == NULL) {
434 m_freem(m);
435 return ENETUNREACH;
436 }
437 }
438
439 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
440}
441
442static int
443stf_checkaddr4(sc, in, inifp)
444 struct stf_softc *sc;
445 struct in_addr *in;
446 struct ifnet *inifp; /* incoming interface */
447{
448 struct in_ifaddr *ia4;
449
450 /*
451 * reject packets with the following address:
452 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
453 */
454 if (IN_MULTICAST(ntohl(in->s_addr)))
455 return -1;
456 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
457 case 0: case 127: case 255:
458 return -1;
459 }
460
461 /*
462 * reject packets with broadcast
463 */
464 for (ia4 = TAILQ_FIRST(&in_ifaddrhead);
465 ia4;
466 ia4 = TAILQ_NEXT(ia4, ia_link))
467 {
468 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
469 continue;
470 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
471 return -1;
472 }
473
474 /*
475 * perform ingress filter
476 */
477 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) {
478 struct sockaddr_in sin;
479 struct rtentry *rt;
480
481 bzero(&sin, sizeof(sin));
482 sin.sin_family = AF_INET;
483 sin.sin_len = sizeof(struct sockaddr_in);
484 sin.sin_addr = *in;
485 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
486 if (!rt || rt->rt_ifp != inifp) {
487#if 0
488 log(LOG_WARNING, "%s: packet from 0x%x dropped "
489 "due to ingress filter\n", if_name(&sc->sc_if),
490 (u_int32_t)ntohl(sin.sin_addr.s_addr));
491#endif
492 if (rt)
493 rtfree(rt);
494 return -1;
495 }
496 rtfree(rt);
497 }
498
499 return 0;
500}
501
502static int
503stf_checkaddr6(sc, in6, inifp)
504 struct stf_softc *sc;
505 struct in6_addr *in6;
506 struct ifnet *inifp; /* incoming interface */
507{
508 /*
509 * check 6to4 addresses
510 */
511 if (IN6_IS_ADDR_6TO4(in6))
512 return stf_checkaddr4(sc, GET_V4(in6), inifp);
513
514 /*
515 * reject anything that look suspicious. the test is implemented
516 * in ip6_input too, but we check here as well to
517 * (1) reject bad packets earlier, and
518 * (2) to be safe against future ip6_input change.
519 */
520 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
521 return -1;
522
523 return 0;
524}
525
526void
f15db79e 527in_stf_input(struct mbuf *m, int off, int proto)
984263bc 528{
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529 struct stf_softc *sc;
530 struct ip *ip;
531 struct ip6_hdr *ip6;
532 u_int8_t otos, itos;
533 int s, isr;
534 struct ifqueue *ifq = NULL;
535 struct ifnet *ifp;
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536
537 if (proto != IPPROTO_IPV6) {
538 m_freem(m);
539 return;
540 }
541
542 ip = mtod(m, struct ip *);
543
544 sc = (struct stf_softc *)encap_getarg(m);
545
546 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) {
547 m_freem(m);
548 return;
549 }
550
551 ifp = &sc->sc_if;
552
553 /*
554 * perform sanity check against outer src/dst.
555 * for source, perform ingress filter as well.
556 */
557 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
558 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) {
559 m_freem(m);
560 return;
561 }
562
563 otos = ip->ip_tos;
564 m_adj(m, off);
565
566 if (m->m_len < sizeof(*ip6)) {
567 m = m_pullup(m, sizeof(*ip6));
568 if (!m)
569 return;
570 }
571 ip6 = mtod(m, struct ip6_hdr *);
572
573 /*
574 * perform sanity check against inner src/dst.
575 * for source, perform ingress filter as well.
576 */
577 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
578 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) {
579 m_freem(m);
580 return;
581 }
582
583 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
584 if ((ifp->if_flags & IFF_LINK1) != 0)
585 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
586 else
587 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
588 ip6->ip6_flow &= ~htonl(0xff << 20);
589 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
590
591 m->m_pkthdr.rcvif = ifp;
592
593 if (ifp->if_bpf) {
594 /*
595 * We need to prepend the address family as
596 * a four byte field. Cons up a dummy header
597 * to pacify bpf. This is safe because bpf
598 * will only read from the mbuf (i.e., it won't
599 * try to free it or keep a pointer a to it).
600 */
601 struct mbuf m0;
602 u_int32_t af = AF_INET6;
603
604 m0.m_next = m;
605 m0.m_len = 4;
606 m0.m_data = (char *)&af;
607
608#ifdef HAVE_OLD_BPF
609 bpf_mtap(ifp, &m0);
610#else
611 bpf_mtap(ifp->if_bpf, &m0);
612#endif
613 }
614
615 /*
616 * Put the packet to the network layer input queue according to the
617 * specified address family.
618 * See net/if_gif.c for possible issues with packet processing
619 * reorder due to extra queueing.
620 */
621 ifq = &ip6intrq;
622 isr = NETISR_IPV6;
623
624 s = splimp();
625 if (IF_QFULL(ifq)) {
626 IF_DROP(ifq); /* update statistics */
627 m_freem(m);
628 splx(s);
629 return;
630 }
631 IF_ENQUEUE(ifq, m);
632 schednetisr(isr);
633 ifp->if_ipackets++;
634 ifp->if_ibytes += m->m_pkthdr.len;
635 splx(s);
636}
637
638/* ARGSUSED */
639static void
640stf_rtrequest(cmd, rt, info)
641 int cmd;
642 struct rtentry *rt;
643 struct rt_addrinfo *info;
644{
645
646 if (rt)
647 rt->rt_rmx.rmx_mtu = IPV6_MMTU;
648}
649
650static int
651stf_ioctl(ifp, cmd, data)
652 struct ifnet *ifp;
653 u_long cmd;
654 caddr_t data;
655{
656 struct ifaddr *ifa;
657 struct ifreq *ifr;
658 struct sockaddr_in6 *sin6;
659 int error;
660
661 error = 0;
662 switch (cmd) {
663 case SIOCSIFADDR:
664 ifa = (struct ifaddr *)data;
665 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
666 error = EAFNOSUPPORT;
667 break;
668 }
669 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
670 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) {
671 ifa->ifa_rtrequest = stf_rtrequest;
672 ifp->if_flags |= IFF_UP;
673 } else
674 error = EINVAL;
675 break;
676
677 case SIOCADDMULTI:
678 case SIOCDELMULTI:
679 ifr = (struct ifreq *)data;
680 if (ifr && ifr->ifr_addr.sa_family == AF_INET6)
681 ;
682 else
683 error = EAFNOSUPPORT;
684 break;
685
686 default:
687 error = EINVAL;
688 break;
689 }
690
691 return error;
692}