1 /* $NetBSD: if_stf.c,v 1.96 2016/07/08 04:33:30 ozaki-r 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 1.96 2016/07/08 04:33:30 ozaki-r Exp $");
79
80 #ifdef _KERNEL_OPT
81 #include "opt_inet.h"
82 #endif
83
84 #ifndef INET6
85 #error "pseudo-device stf requires options INET6"
86 #endif
87
88 #include <sys/param.h>
89 #include <sys/systm.h>
90 #include <sys/socket.h>
91 #include <sys/sockio.h>
92 #include <sys/mbuf.h>
93 #include <sys/errno.h>
94 #include <sys/ioctl.h>
95 #include <sys/proc.h>
96 #include <sys/queue.h>
97 #include <sys/syslog.h>
98
99 #include <sys/cpu.h>
100
101 #include <net/if.h>
102 #include <net/route.h>
103 #include <net/netisr.h>
104 #include <net/if_types.h>
105 #include <net/if_stf.h>
106
107 #include <netinet/in.h>
108 #include <netinet/in_systm.h>
109 #include <netinet/ip.h>
110 #include <netinet/ip_var.h>
111 #include <netinet/in_var.h>
112
113 #include <netinet/ip6.h>
114 #include <netinet6/ip6_var.h>
115 #include <netinet6/in6_gif.h>
116 #include <netinet6/in6_var.h>
117 #include <netinet/ip_ecn.h>
118
119 #include <netinet/ip_encap.h>
120
121 #include <net/net_osdep.h>
122
123 #include "stf.h"
124 #include "gif.h" /*XXX*/
125
126 #include <net/bpf.h>
127
128 #if NGIF > 0
129 #include <net/if_gif.h>
130 #endif
131
132 #include "ioconf.h"
133
134 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
135 #define GET_V4(x) ((const struct in_addr *)(&(x)->s6_addr16[1]))
136
137 struct stf_softc {
138 struct ifnet sc_if; /* common area */
139 struct route sc_ro;
140 const struct encaptab *encap_cookie;
141 LIST_ENTRY(stf_softc) sc_list;
142 };
143
144 static LIST_HEAD(, stf_softc) stf_softc_list;
145
146 static int stf_clone_create(struct if_clone *, int);
147 static int stf_clone_destroy(struct ifnet *);
148
149 struct if_clone stf_cloner =
150 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy);
151
152 #if NGIF > 0
153 extern int ip_gif_ttl; /*XXX*/
154 #else
155 static int ip_gif_ttl = 40; /*XXX*/
156 #endif
157
158 extern struct domain inetdomain;
159
160 static const struct encapsw in_stf_encapsw =
161 {
162 .encapsw4 = {
163 .pr_input = in_stf_input,
164 .pr_ctlinput = NULL,
165 }
166 };
167
168 static int stf_encapcheck(struct mbuf *, int, int, void *);
169 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *);
170 static int stf_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
171 const struct rtentry *);
172 static int isrfc1918addr(const struct in_addr *);
173 static int stf_checkaddr4(struct stf_softc *, const struct in_addr *,
174 struct ifnet *);
175 static int stf_checkaddr6(struct stf_softc *, const struct in6_addr *,
176 struct ifnet *);
177 static void stf_rtrequest(int, struct rtentry *, const struct rt_addrinfo *);
178 static int stf_ioctl(struct ifnet *, u_long, void *);
179
180 /* ARGSUSED */
181 void
stfattach(int count)182 stfattach(int count)
183 {
184
185 LIST_INIT(&stf_softc_list);
186 if_clone_attach(&stf_cloner);
187 }
188
189 static int
stf_clone_create(struct if_clone * ifc,int unit)190 stf_clone_create(struct if_clone *ifc, int unit)
191 {
192 struct stf_softc *sc;
193 int error;
194
195 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT|M_ZERO);
196 if_initname(&sc->sc_if, ifc->ifc_name, unit);
197
198 error = encap_lock_enter();
199 if (error) {
200 free(sc, M_DEVBUF);
201 return error;
202 }
203
204 if (LIST_FIRST(&stf_softc_list) != NULL) {
205 /* Only one stf interface is allowed. */
206 encap_lock_exit();
207 free(sc, M_DEVBUF);
208 return (EEXIST);
209 }
210
211 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6,
212 stf_encapcheck, &in_stf_encapsw, sc);
213 encap_lock_exit();
214 if (sc->encap_cookie == NULL) {
215 printf("%s: unable to attach encap\n", if_name(&sc->sc_if));
216 free(sc, M_DEVBUF);
217 return (EIO); /* XXX */
218 }
219
220 sc->sc_if.if_mtu = STF_MTU;
221 sc->sc_if.if_flags = 0;
222 sc->sc_if.if_ioctl = stf_ioctl;
223 sc->sc_if.if_output = stf_output;
224 sc->sc_if.if_type = IFT_STF;
225 sc->sc_if.if_dlt = DLT_NULL;
226 if_attach(&sc->sc_if);
227 if_alloc_sadl(&sc->sc_if);
228 bpf_attach(&sc->sc_if, DLT_NULL, sizeof(u_int));
229 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list);
230 return (0);
231 }
232
233 static int
stf_clone_destroy(struct ifnet * ifp)234 stf_clone_destroy(struct ifnet *ifp)
235 {
236 struct stf_softc *sc = (void *) ifp;
237
238 encap_lock_enter();
239 LIST_REMOVE(sc, sc_list);
240 encap_detach(sc->encap_cookie);
241 encap_lock_exit();
242 bpf_detach(ifp);
243 if_detach(ifp);
244 rtcache_free(&sc->sc_ro);
245 free(sc, M_DEVBUF);
246
247 return (0);
248 }
249
250 static int
stf_encapcheck(struct mbuf * m,int off,int proto,void * arg)251 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg)
252 {
253 struct ip ip;
254 struct in6_ifaddr *ia6;
255 struct stf_softc *sc;
256 struct in_addr a, b;
257
258 sc = (struct stf_softc *)arg;
259 if (sc == NULL)
260 return 0;
261
262 if ((sc->sc_if.if_flags & IFF_UP) == 0)
263 return 0;
264
265 /* IFF_LINK0 means "no decapsulation" */
266 if ((sc->sc_if.if_flags & IFF_LINK0) != 0)
267 return 0;
268
269 if (proto != IPPROTO_IPV6)
270 return 0;
271
272 m_copydata(m, 0, sizeof(ip), (void *)&ip);
273
274 if (ip.ip_v != 4)
275 return 0;
276
277 ia6 = stf_getsrcifa6(&sc->sc_if);
278 if (ia6 == NULL)
279 return 0;
280
281 /*
282 * check if IPv4 dst matches the IPv4 address derived from the
283 * local 6to4 address.
284 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
285 */
286 if (memcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
287 sizeof(ip.ip_dst)) != 0)
288 return 0;
289
290 /*
291 * check if IPv4 src matches the IPv4 address derived from the
292 * local 6to4 address masked by prefixmask.
293 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
294 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
295 */
296 memset(&a, 0, sizeof(a));
297 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr;
298 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
299 b = ip.ip_src;
300 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
301 if (a.s_addr != b.s_addr)
302 return 0;
303
304 /* stf interface makes single side match only */
305 return 32;
306 }
307
308 static struct in6_ifaddr *
stf_getsrcifa6(struct ifnet * ifp)309 stf_getsrcifa6(struct ifnet *ifp)
310 {
311 struct ifaddr *ifa;
312 struct in_ifaddr *ia4;
313 struct sockaddr_in6 *sin6;
314 struct in_addr in;
315
316 IFADDR_READER_FOREACH(ifa, ifp)
317 {
318 if (ifa->ifa_addr->sa_family != AF_INET6)
319 continue;
320 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
321 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
322 continue;
323
324 memcpy(&in, GET_V4(&sin6->sin6_addr), sizeof(in));
325 ia4 = in_get_ia(in);
326 if (ia4 == NULL)
327 continue;
328
329 return (struct in6_ifaddr *)ifa;
330 }
331
332 return NULL;
333 }
334
335 static int
stf_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,const struct rtentry * rt0)336 stf_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
337 const struct rtentry *rt0)
338 {
339 struct rtentry *rt;
340 struct stf_softc *sc;
341 const struct sockaddr_in6 *dst6;
342 const struct in_addr *in4;
343 uint8_t tos;
344 struct ip *ip;
345 struct ip6_hdr *ip6;
346 struct in6_ifaddr *ia6;
347 union {
348 struct sockaddr dst;
349 struct sockaddr_in dst4;
350 } u;
351
352 sc = (struct stf_softc*)ifp;
353 dst6 = (const struct sockaddr_in6 *)dst;
354
355 /* just in case */
356 if ((ifp->if_flags & IFF_UP) == 0) {
357 m_freem(m);
358 return ENETDOWN;
359 }
360
361 /*
362 * If we don't have an ip4 address that match my inner ip6 address,
363 * we shouldn't generate output. Without this check, we'll end up
364 * using wrong IPv4 source.
365 */
366 ia6 = stf_getsrcifa6(ifp);
367 if (ia6 == NULL) {
368 m_freem(m);
369 ifp->if_oerrors++;
370 return ENETDOWN;
371 }
372
373 if (m->m_len < sizeof(*ip6)) {
374 m = m_pullup(m, sizeof(*ip6));
375 if (m == NULL) {
376 ifp->if_oerrors++;
377 return ENOBUFS;
378 }
379 }
380 ip6 = mtod(m, struct ip6_hdr *);
381 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
382
383 /*
384 * Pickup the right outer dst addr from the list of candidates.
385 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
386 */
387 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
388 in4 = GET_V4(&ip6->ip6_dst);
389 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
390 in4 = GET_V4(&dst6->sin6_addr);
391 else {
392 m_freem(m);
393 ifp->if_oerrors++;
394 return ENETUNREACH;
395 }
396
397 bpf_mtap_af(ifp, AF_INET6, m);
398
399 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
400 if (m && m->m_len < sizeof(struct ip))
401 m = m_pullup(m, sizeof(struct ip));
402 if (m == NULL) {
403 ifp->if_oerrors++;
404 return ENOBUFS;
405 }
406 ip = mtod(m, struct ip *);
407
408 memset(ip, 0, sizeof(*ip));
409
410 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
411 &ip->ip_src, sizeof(ip->ip_src));
412 memcpy(&ip->ip_dst, in4, sizeof(ip->ip_dst));
413 ip->ip_p = IPPROTO_IPV6;
414 ip->ip_ttl = ip_gif_ttl; /*XXX*/
415 ip->ip_len = htons(m->m_pkthdr.len);
416 if (ifp->if_flags & IFF_LINK1)
417 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
418 else
419 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
420
421 sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
422 if ((rt = rtcache_lookup(&sc->sc_ro, &u.dst)) == NULL) {
423 m_freem(m);
424 ifp->if_oerrors++;
425 return ENETUNREACH;
426 }
427
428 /* If the route constitutes infinite encapsulation, punt. */
429 if (rt->rt_ifp == ifp) {
430 rtcache_free(&sc->sc_ro);
431 m_freem(m);
432 ifp->if_oerrors++;
433 return ENETUNREACH;
434 }
435
436 ifp->if_opackets++;
437 ifp->if_obytes += m->m_pkthdr.len - sizeof(struct ip);
438 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
439 }
440
441 static int
isrfc1918addr(const struct in_addr * in)442 isrfc1918addr(const struct in_addr *in)
443 {
444 /*
445 * returns 1 if private address range:
446 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
447 */
448 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 ||
449 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 ||
450 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)
451 return 1;
452
453 return 0;
454 }
455
456 static int
stf_checkaddr4(struct stf_softc * sc,const struct in_addr * in,struct ifnet * inifp)457 stf_checkaddr4(struct stf_softc *sc, const struct in_addr *in,
458 struct ifnet *inifp /*incoming interface*/)
459 {
460 struct in_ifaddr *ia4;
461
462 /*
463 * reject packets with the following address:
464 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
465 */
466 if (IN_MULTICAST(in->s_addr))
467 return -1;
468 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
469 case 0: case 127: case 255:
470 return -1;
471 }
472
473 /*
474 * reject packets with private address range.
475 * (requirement from RFC3056 section 2 1st paragraph)
476 */
477 if (isrfc1918addr(in))
478 return -1;
479
480 /*
481 * reject packet with IPv4 link-local (169.254.0.0/16),
482 * as suggested in draft-savola-v6ops-6to4-security-00.txt
483 */
484 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 &&
485 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254)
486 return -1;
487
488 /*
489 * reject packets with broadcast
490 */
491 IN_ADDRLIST_READER_FOREACH(ia4) {
492 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
493 continue;
494 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
495 return -1;
496 }
497
498 /*
499 * perform ingress filter
500 */
501 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) {
502 struct sockaddr_in sin;
503 struct rtentry *rt;
504
505 memset(&sin, 0, sizeof(sin));
506 sin.sin_family = AF_INET;
507 sin.sin_len = sizeof(struct sockaddr_in);
508 sin.sin_addr = *in;
509 rt = rtalloc1((struct sockaddr *)&sin, 0);
510 if (!rt || rt->rt_ifp != inifp) {
511 #if 0
512 log(LOG_WARNING, "%s: packet from 0x%x dropped "
513 "due to ingress filter\n", if_name(&sc->sc_if),
514 (uint32_t)ntohl(sin.sin_addr.s_addr));
515 #endif
516 if (rt)
517 rtfree(rt);
518 return -1;
519 }
520 rtfree(rt);
521 }
522
523 return 0;
524 }
525
526 static int
stf_checkaddr6(struct stf_softc * sc,const struct in6_addr * in6,struct ifnet * inifp)527 stf_checkaddr6(struct stf_softc *sc, const struct in6_addr *in6,
528 struct ifnet *inifp /*incoming interface*/)
529 {
530
531 /*
532 * check 6to4 addresses
533 */
534 if (IN6_IS_ADDR_6TO4(in6))
535 return stf_checkaddr4(sc, GET_V4(in6), inifp);
536
537 /*
538 * reject anything that look suspicious. the test is implemented
539 * in ip6_input too, but we check here as well to
540 * (1) reject bad packets earlier, and
541 * (2) to be safe against future ip6_input change.
542 */
543 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
544 return -1;
545
546 /*
547 * reject link-local and site-local unicast
548 * as suggested in draft-savola-v6ops-6to4-security-00.txt
549 */
550 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6))
551 return -1;
552
553 /*
554 * reject node-local and link-local multicast
555 * as suggested in draft-savola-v6ops-6to4-security-00.txt
556 */
557 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6))
558 return -1;
559
560 return 0;
561 }
562
563 void
in_stf_input(struct mbuf * m,int off,int proto)564 in_stf_input(struct mbuf *m, int off, int proto)
565 {
566 int s;
567 struct stf_softc *sc;
568 struct ip *ip;
569 struct ip6_hdr *ip6;
570 uint8_t otos, itos;
571 struct ifnet *ifp;
572 size_t pktlen;
573
574 if (proto != IPPROTO_IPV6) {
575 m_freem(m);
576 return;
577 }
578
579 ip = mtod(m, struct ip *);
580
581 sc = (struct stf_softc *)encap_getarg(m);
582
583 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) {
584 m_freem(m);
585 return;
586 }
587
588 ifp = &sc->sc_if;
589
590 /*
591 * perform sanity check against outer src/dst.
592 * for source, perform ingress filter as well.
593 */
594 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
595 stf_checkaddr4(sc, &ip->ip_src, m_get_rcvif_NOMPSAFE(m)) < 0) {
596 m_freem(m);
597 return;
598 }
599
600 otos = ip->ip_tos;
601 m_adj(m, off);
602
603 if (m->m_len < sizeof(*ip6)) {
604 m = m_pullup(m, sizeof(*ip6));
605 if (!m)
606 return;
607 }
608 ip6 = mtod(m, struct ip6_hdr *);
609
610 /*
611 * perform sanity check against inner src/dst.
612 * for source, perform ingress filter as well.
613 */
614 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
615 stf_checkaddr6(sc, &ip6->ip6_src, m_get_rcvif_NOMPSAFE(m)) < 0) {
616 m_freem(m);
617 return;
618 }
619
620 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
621 if ((ifp->if_flags & IFF_LINK1) != 0)
622 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
623 else
624 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
625 ip6->ip6_flow &= ~htonl(0xff << 20);
626 ip6->ip6_flow |= htonl((uint32_t)itos << 20);
627
628 pktlen = m->m_pkthdr.len;
629 m_set_rcvif(m, ifp);
630
631 bpf_mtap_af(ifp, AF_INET6, m);
632
633 /*
634 * Put the packet to the network layer input queue according to the
635 * specified address family.
636 * See net/if_gif.c for possible issues with packet processing
637 * reorder due to extra queueing.
638 */
639
640 s = splnet();
641 if (__predict_true(pktq_enqueue(ip6_pktq, m, 0))) {
642 ifp->if_ipackets++;
643 ifp->if_ibytes += pktlen;
644 } else {
645 m_freem(m);
646 }
647 splx(s);
648
649 return;
650 }
651
652 /* ARGSUSED */
653 static void
stf_rtrequest(int cmd,struct rtentry * rt,const struct rt_addrinfo * info)654 stf_rtrequest(int cmd, struct rtentry *rt,
655 const struct rt_addrinfo *info)
656 {
657 if (rt != NULL) {
658 struct stf_softc *sc;
659
660 sc = LIST_FIRST(&stf_softc_list);
661 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU;
662 }
663 }
664
665 static int
stf_ioctl(struct ifnet * ifp,u_long cmd,void * data)666 stf_ioctl(struct ifnet *ifp, u_long cmd, void *data)
667 {
668 struct ifaddr *ifa;
669 struct ifreq *ifr = data;
670 struct sockaddr_in6 *sin6;
671 int error;
672
673 error = 0;
674 switch (cmd) {
675 case SIOCINITIFADDR:
676 ifa = (struct ifaddr *)data;
677 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
678 error = EAFNOSUPPORT;
679 break;
680 }
681 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
682 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) &&
683 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) {
684 ifa->ifa_rtrequest = stf_rtrequest;
685 ifp->if_flags |= IFF_UP;
686 } else
687 error = EINVAL;
688 break;
689
690 case SIOCADDMULTI:
691 case SIOCDELMULTI:
692 if (ifr != NULL &&
693 ifreq_getaddr(cmd, ifr)->sa_family == AF_INET6)
694 ;
695 else
696 error = EAFNOSUPPORT;
697 break;
698
699 case SIOCSIFMTU:
700 if (ifr->ifr_mtu < STF_MTU_MIN || ifr->ifr_mtu > STF_MTU_MAX)
701 return EINVAL;
702 else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
703 error = 0;
704 break;
705
706 default:
707 error = ifioctl_common(ifp, cmd, data);
708 break;
709 }
710
711 return error;
712 }
713