1 /* $FreeBSD: src/sys/net/if_stf.c,v 1.1.2.11 2003/01/23 21:06:44 sam Exp $ */
2 /* $KAME: if_stf.c,v 1.73 2001/12/03 11:08:30 keiichi 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 "opt_inet.h"
78 #include "opt_inet6.h"
79
80 #include <sys/param.h>
81 #include <sys/systm.h>
82 #include <sys/socket.h>
83 #include <sys/sockio.h>
84 #include <sys/mbuf.h>
85 #include <sys/errno.h>
86 #include <sys/protosw.h>
87 #include <sys/kernel.h>
88 #include <machine/cpu.h>
89
90 #include <sys/malloc.h>
91
92 #include <net/if.h>
93 #include <net/route.h>
94 #include <net/netisr.h>
95 #include <net/if_types.h>
96 #include <net/ifq_var.h>
97 #include <net/netisr2.h>
98 #include "if_stf.h"
99
100 #include <netinet/in.h>
101 #include <netinet/in_systm.h>
102 #include <netinet/ip.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 <netinet6/nd6.h>
110 #include <netinet/ip_ecn.h>
111
112 #include <netinet/ip_encap.h>
113
114 #include <machine/stdarg.h>
115
116 #include <net/net_osdep.h>
117
118 #include <net/bpf.h>
119
120 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
121 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1]))
122
123 struct stf_softc {
124 struct ifnet sc_if; /* common area */
125 struct route *route_pcpu;
126 const struct encaptab *encap_cookie;
127 };
128
129 static struct stf_softc *stf;
130
131 static MALLOC_DEFINE(M_STF, "stf", "6to4 Tunnel Interface");
132 static int ip_stf_ttl = 40;
133
134 extern struct domain inetdomain;
135 struct protosw in_stf_protosw =
136 {
137 .pr_type = SOCK_RAW,
138 .pr_domain = &inetdomain,
139 .pr_protocol = IPPROTO_IPV6,
140 .pr_flags = PR_ATOMIC|PR_ADDR,
141
142 .pr_input = in_stf_input,
143 .pr_output = rip_output,
144 .pr_ctlinput = NULL,
145 .pr_ctloutput = rip_ctloutput,
146
147 .pr_usrreqs = &rip_usrreqs
148 };
149
150 static int stfmodevent (module_t, int, void *);
151 static int stf_encapcheck (const struct mbuf *, int, int, void *);
152 static struct in6_ifaddr *stf_getsrcifa6 (struct ifnet *);
153 static int stf_output (struct ifnet *, struct mbuf *, struct sockaddr *,
154 struct rtentry *);
155 static int stf_checkaddr4 (struct stf_softc *, struct in_addr *,
156 struct ifnet *);
157 static int stf_checkaddr6 (struct stf_softc *, struct in6_addr *,
158 struct ifnet *);
159 static void stf_rtrequest (int, struct rtentry *);
160 static int stf_ioctl (struct ifnet *, u_long, caddr_t, struct ucred *);
161
162 static int
stfmodevent(module_t mod,int type,void * data)163 stfmodevent(module_t mod, int type, void *data)
164 {
165 struct stf_softc *sc;
166 int err, cpu;
167 const struct encaptab *p;
168
169 switch (type) {
170 case MOD_LOAD:
171 stf = kmalloc(sizeof(struct stf_softc), M_STF,
172 M_WAITOK | M_ZERO);
173 sc = stf;
174
175 bzero(sc, sizeof(*sc));
176 if_initname(&(sc->sc_if), "stf", 0);
177
178 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck,
179 (void *)&in_stf_protosw, sc);
180 if (p == NULL) {
181 kprintf("%s: attach failed\n", if_name(&sc->sc_if));
182 return (ENOMEM);
183 }
184 sc->encap_cookie = p;
185 sc->route_pcpu = kmalloc(netisr_ncpus * sizeof(struct route),
186 M_STF, M_WAITOK | M_ZERO);
187
188 sc->sc_if.if_mtu = IPV6_MMTU;
189 sc->sc_if.if_flags = 0;
190 sc->sc_if.if_ioctl = stf_ioctl;
191 sc->sc_if.if_output = stf_output;
192 sc->sc_if.if_type = IFT_STF;
193 #if 0
194 /* turn off ingress filter */
195 sc->sc_if.if_flags |= IFF_LINK2;
196 #endif
197 ifq_set_maxlen(&sc->sc_if.if_snd, IFQ_MAXLEN);
198 if_attach(&sc->sc_if, NULL);
199 bpfattach(&sc->sc_if, DLT_NULL, sizeof(uint32_t));
200 /*
201 * 6to4 interface is very special: no multicast, no linklocal.
202 * RFC2529 specifies how to make linklocals, but there's no
203 * use and it is rather harmful to have one.
204 *
205 * NOTE: ND_IFINFO() is only available after if_attach().
206 */
207 ND_IFINFO(&sc->sc_if)->flags &= ~ND6_IFF_AUTO_LINKLOCAL;
208 ND_IFINFO(&sc->sc_if)->flags |= ND6_IFF_NO_DAD;
209 break;
210 case MOD_UNLOAD:
211 sc = stf;
212 bpfdetach(&sc->sc_if);
213 if_detach(&sc->sc_if);
214 err = encap_detach(sc->encap_cookie);
215 KASSERT(err == 0, ("Unexpected error detaching encap_cookie"));
216 for (cpu = 0; cpu < netisr_ncpus; ++cpu) {
217 if (sc->route_pcpu[cpu].ro_rt != NULL) {
218 rtfree_async(sc->route_pcpu[cpu].ro_rt);
219 sc->route_pcpu[cpu].ro_rt = NULL;
220 }
221 }
222 kfree(sc->route_pcpu, M_STF);
223 kfree(sc, M_STF);
224 break;
225 }
226
227 return (0);
228 }
229
230 static moduledata_t stf_mod = {
231 "if_stf",
232 stfmodevent,
233 0
234 };
235
236 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
237
238 static int
stf_encapcheck(const struct mbuf * m,int off,int proto,void * arg)239 stf_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
240 {
241 struct ip ip;
242 struct in6_ifaddr *ia6;
243 struct stf_softc *sc;
244 struct in_addr a, b;
245
246 sc = (struct stf_softc *)arg;
247 if (sc == NULL)
248 return 0;
249
250 if ((sc->sc_if.if_flags & IFF_UP) == 0)
251 return 0;
252
253 /* IFF_LINK0 means "no decapsulation" */
254 if ((sc->sc_if.if_flags & IFF_LINK0) != 0)
255 return 0;
256
257 if (proto != IPPROTO_IPV6)
258 return 0;
259
260 m_copydata(m, 0, sizeof(ip), &ip);
261
262 if (ip.ip_v != 4)
263 return 0;
264
265 ia6 = stf_getsrcifa6(&sc->sc_if);
266 if (ia6 == NULL)
267 return 0;
268
269 /*
270 * check if IPv4 dst matches the IPv4 address derived from the
271 * local 6to4 address.
272 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
273 */
274 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
275 sizeof(ip.ip_dst)) != 0)
276 return 0;
277
278 /*
279 * check if IPv4 src matches the IPv4 address derived from the
280 * local 6to4 address masked by prefixmask.
281 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
282 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
283 */
284 bzero(&a, sizeof(a));
285 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr;
286 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
287 b = ip.ip_src;
288 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
289 if (a.s_addr != b.s_addr)
290 return 0;
291
292 /* stf interface makes single side match only */
293 return 32;
294 }
295
296 static struct in6_ifaddr *
stf_getsrcifa6(struct ifnet * ifp)297 stf_getsrcifa6(struct ifnet *ifp)
298 {
299 struct ifaddr_container *ifac;
300 struct sockaddr_in6 *sin6;
301 struct in_addr in;
302
303 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
304 struct ifaddr *ia = ifac->ifa;
305 struct in_ifaddr_container *iac;
306
307 if (ia->ifa_addr == NULL)
308 continue;
309 if (ia->ifa_addr->sa_family != AF_INET6)
310 continue;
311 sin6 = (struct sockaddr_in6 *)ia->ifa_addr;
312 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
313 continue;
314
315 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
316 LIST_FOREACH(iac, INADDR_HASH(in.s_addr), ia_hash) {
317 if (iac->ia->ia_addr.sin_addr.s_addr == in.s_addr)
318 break;
319 }
320 if (iac == NULL)
321 continue;
322
323 return (struct in6_ifaddr *)ia;
324 }
325
326 return NULL;
327 }
328
329 static int
stf_output_serialized(struct ifnet * ifp,struct mbuf * m,struct sockaddr * dst,struct rtentry * rt)330 stf_output_serialized(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
331 struct rtentry *rt)
332 {
333 struct stf_softc *sc;
334 struct sockaddr_in6 *dst6;
335 struct in_addr *in4;
336 struct sockaddr_in *dst4;
337 u_int8_t tos;
338 struct ip *ip;
339 struct ip6_hdr *ip6;
340 struct in6_ifaddr *ia6;
341 struct route *ro;
342 static const uint32_t af = AF_INET6;
343
344 ASSERT_NETISR_NCPUS(mycpuid);
345
346 sc = (struct stf_softc*)ifp;
347 dst6 = (struct sockaddr_in6 *)dst;
348
349 /* just in case */
350 if ((ifp->if_flags & IFF_UP) == 0) {
351 m_freem(m);
352 return ENETDOWN;
353 }
354
355 /*
356 * If we don't have an ip4 address that match my inner ip6 address,
357 * we shouldn't generate output. Without this check, we'll end up
358 * using wrong IPv4 source.
359 */
360 ia6 = stf_getsrcifa6(ifp);
361 if (ia6 == NULL) {
362 m_freem(m);
363 return ENETDOWN;
364 }
365
366 if (m->m_len < sizeof(*ip6)) {
367 m = m_pullup(m, sizeof(*ip6));
368 if (!m)
369 return ENOBUFS;
370 }
371 ip6 = mtod(m, struct ip6_hdr *);
372 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
373
374 /*
375 * Pickup the right outer dst addr from the list of candidates.
376 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
377 */
378 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
379 in4 = GET_V4(&ip6->ip6_dst);
380 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
381 in4 = GET_V4(&dst6->sin6_addr);
382 else {
383 m_freem(m);
384 return ENETUNREACH;
385 }
386
387 if (ifp->if_bpf) {
388 bpf_gettoken();
389 if (ifp->if_bpf)
390 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
391 bpf_reltoken();
392 }
393
394 M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
395 if (m && m->m_len < sizeof(struct ip))
396 m = m_pullup(m, sizeof(struct ip));
397 if (m == NULL)
398 return ENOBUFS;
399 ip = mtod(m, struct ip *);
400
401 bzero(ip, sizeof(*ip));
402
403 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
404 &ip->ip_src, sizeof(ip->ip_src));
405 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst));
406 ip->ip_p = IPPROTO_IPV6;
407 ip->ip_ttl = ip_stf_ttl;
408 ip->ip_len = htons(m->m_pkthdr.len); /* network order */
409 if (ifp->if_flags & IFF_LINK1)
410 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
411 else
412 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
413
414 ro = &sc->route_pcpu[mycpuid];
415 dst4 = (struct sockaddr_in *)&ro->ro_dst;
416 if (dst4->sin_family != AF_INET ||
417 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) {
418 /* cache route doesn't match */
419 dst4->sin_family = AF_INET;
420 dst4->sin_len = sizeof(struct sockaddr_in);
421 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr));
422 if (ro->ro_rt) {
423 RTFREE(ro->ro_rt);
424 ro->ro_rt = NULL;
425 }
426 }
427 if (ro->ro_rt != NULL && (ro->ro_rt->rt_flags & RTF_UP) == 0) {
428 RTFREE(ro->ro_rt);
429 ro->ro_rt = NULL;
430 }
431
432 if (ro->ro_rt == NULL) {
433 rtalloc(ro);
434 if (ro->ro_rt == NULL) {
435 m_freem(m);
436 return ENETUNREACH;
437 }
438 }
439
440 return ip_output(m, NULL, ro, IP_DEBUGROUTE, NULL, NULL);
441 }
442
443 static int
stf_output(struct ifnet * ifp,struct mbuf * m,struct sockaddr * dst,struct rtentry * rt)444 stf_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
445 struct rtentry *rt)
446 {
447 struct ifaltq_subque *ifsq = ifq_get_subq_default(&ifp->if_snd);
448 int error;
449
450 ifsq_serialize_hw(ifsq);
451 error = stf_output_serialized(ifp, m, dst, rt);
452 ifsq_deserialize_hw(ifsq);
453
454 return error;
455 }
456
457 /*
458 * Parameters:
459 * inifp: incoming interface
460 */
461 static int
stf_checkaddr4(struct stf_softc * sc,struct in_addr * in,struct ifnet * inifp)462 stf_checkaddr4(struct stf_softc *sc, struct in_addr *in, struct ifnet *inifp)
463 {
464 struct in_ifaddr_container *iac;
465
466 /*
467 * reject packets with the following address:
468 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
469 */
470 if (IN_MULTICAST(ntohl(in->s_addr)))
471 return -1;
472 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
473 case 0: case 127: case 255:
474 return -1;
475 }
476
477 /*
478 * reject packets with broadcast
479 */
480 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
481 struct in_ifaddr *ia4 = iac->ia;
482
483 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
484 continue;
485 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
486 return -1;
487 }
488
489 /*
490 * perform ingress filter
491 */
492 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) {
493 struct sockaddr_in sin;
494 struct rtentry *rt;
495
496 bzero(&sin, sizeof(sin));
497 sin.sin_family = AF_INET;
498 sin.sin_len = sizeof(struct sockaddr_in);
499 sin.sin_addr = *in;
500 rt = rtpurelookup((struct sockaddr *)&sin);
501 if (!rt || rt->rt_ifp != inifp) {
502 #if 0
503 log(LOG_WARNING, "%s: packet from 0x%x dropped "
504 "due to ingress filter\n", if_name(&sc->sc_if),
505 (u_int32_t)ntohl(sin.sin_addr.s_addr));
506 #endif
507 if (rt)
508 rtfree(rt);
509 return -1;
510 }
511 rtfree(rt);
512 }
513
514 return 0;
515 }
516
517 /*
518 * Parameters:
519 * inifp: incoming interface
520 */
521 static int
stf_checkaddr6(struct stf_softc * sc,struct in6_addr * in6,struct ifnet * inifp)522 stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6, struct ifnet *inifp)
523 {
524 /*
525 * check 6to4 addresses
526 */
527 if (IN6_IS_ADDR_6TO4(in6))
528 return stf_checkaddr4(sc, GET_V4(in6), inifp);
529
530 /*
531 * reject anything that look suspicious. the test is implemented
532 * in ip6_input too, but we check here as well to
533 * (1) reject bad packets earlier, and
534 * (2) to be safe against future ip6_input change.
535 */
536 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
537 return -1;
538
539 return 0;
540 }
541
542 int
in_stf_input(struct mbuf ** mp,int * offp,int proto)543 in_stf_input(struct mbuf **mp, int *offp, int proto)
544 {
545 struct mbuf *m;
546 struct stf_softc *sc;
547 struct ip *ip;
548 struct ip6_hdr *ip6;
549 u_int8_t otos, itos;
550 struct ifnet *ifp;
551 int off;
552 static const uint32_t af = AF_INET6;
553
554 m = *mp;
555 off = *offp;
556
557 if (proto != IPPROTO_IPV6) {
558 m_freem(m);
559 return(IPPROTO_DONE);
560 }
561
562 ip = mtod(m, struct ip *);
563
564 sc = (struct stf_softc *)encap_getarg(m);
565
566 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) {
567 m_freem(m);
568 return(IPPROTO_DONE);
569 }
570
571 ifp = &sc->sc_if;
572
573 /*
574 * perform sanity check against outer src/dst.
575 * for source, perform ingress filter as well.
576 */
577 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
578 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) {
579 m_freem(m);
580 return(IPPROTO_DONE);
581 }
582
583 otos = ip->ip_tos;
584 m_adj(m, off);
585
586 if (m->m_len < sizeof(*ip6)) {
587 m = m_pullup(m, sizeof(*ip6));
588 if (!m)
589 return(IPPROTO_DONE);
590 }
591 ip6 = mtod(m, struct ip6_hdr *);
592
593 /*
594 * perform sanity check against inner src/dst.
595 * for source, perform ingress filter as well.
596 */
597 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
598 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) {
599 m_freem(m);
600 return(IPPROTO_DONE);
601 }
602
603 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
604 if ((ifp->if_flags & IFF_LINK1) != 0)
605 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
606 else
607 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
608 ip6->ip6_flow &= ~htonl(0xff << 20);
609 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
610
611 m->m_pkthdr.rcvif = ifp;
612
613 if (ifp->if_bpf) {
614 bpf_gettoken();
615 if (ifp->if_bpf)
616 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
617 bpf_reltoken();
618 }
619
620 /*
621 * Put the packet to the network layer input queue according to the
622 * specified address family.
623 * See net/if_gif.c for possible issues with packet processing
624 * reorder due to extra queueing.
625 */
626 IFNET_STAT_INC(ifp, ipackets, 1);
627 IFNET_STAT_INC(ifp, ibytes, m->m_pkthdr.len);
628 m->m_flags &= ~M_HASH;
629 netisr_queue(NETISR_IPV6, m);
630 return(IPPROTO_DONE);
631 }
632
633 /* ARGSUSED */
634 static void
stf_rtrequest(int cmd,struct rtentry * rt)635 stf_rtrequest(int cmd, struct rtentry *rt)
636 {
637
638 if (rt)
639 rt->rt_rmx.rmx_mtu = IPV6_MMTU;
640 }
641
642 static int
stf_ioctl(struct ifnet * ifp,u_long cmd,caddr_t data,struct ucred * cr)643 stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
644 {
645 struct ifaddr *ifa;
646 struct ifreq *ifr;
647 struct sockaddr_in6 *sin6;
648 int error;
649
650 error = 0;
651 switch (cmd) {
652 case SIOCSIFADDR:
653 ifa = (struct ifaddr *)data;
654 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
655 error = EAFNOSUPPORT;
656 break;
657 }
658 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
659 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) {
660 ifa->ifa_rtrequest = stf_rtrequest;
661 ifp->if_flags |= IFF_UP;
662 } else
663 error = EINVAL;
664 break;
665
666 case SIOCADDMULTI:
667 case SIOCDELMULTI:
668 ifr = (struct ifreq *)data;
669 if (ifr && ifr->ifr_addr.sa_family == AF_INET6)
670 ;
671 else
672 error = EAFNOSUPPORT;
673 break;
674
675 default:
676 error = EINVAL;
677 break;
678 }
679
680 return error;
681 }
682