FreeBSD/Linux Kernel Cross Reference
sys/net/if_stf.c
1 /* $NetBSD: if_stf.c,v 1.54 2006/11/16 01:33:40 christos 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 1.54 2006/11/16 01:33:40 christos Exp $");
79
80 #include "opt_inet.h"
81
82 #include <sys/param.h>
83 #include <sys/systm.h>
84 #include <sys/socket.h>
85 #include <sys/sockio.h>
86 #include <sys/mbuf.h>
87 #include <sys/errno.h>
88 #include <sys/ioctl.h>
89 #include <sys/proc.h>
90 #include <sys/protosw.h>
91 #include <sys/queue.h>
92 #include <sys/syslog.h>
93 #include <sys/kauth.h>
94
95 #include <machine/cpu.h>
96
97 #include <net/if.h>
98 #include <net/route.h>
99 #include <net/netisr.h>
100 #include <net/if_types.h>
101 #include <net/if_stf.h>
102
103 #include <netinet/in.h>
104 #include <netinet/in_systm.h>
105 #include <netinet/ip.h>
106 #include <netinet/ip_var.h>
107 #include <netinet/in_var.h>
108
109 #include <netinet/ip6.h>
110 #include <netinet6/ip6_var.h>
111 #include <netinet6/in6_gif.h>
112 #include <netinet6/in6_var.h>
113 #include <netinet/ip_ecn.h>
114
115 #include <netinet/ip_encap.h>
116
117 #include <machine/stdarg.h>
118
119 #include <net/net_osdep.h>
120
121 #include "bpfilter.h"
122 #include "stf.h"
123 #include "gif.h" /*XXX*/
124
125 #if NBPFILTER > 0
126 #include <net/bpf.h>
127 #endif
128
129 #if NGIF > 0
130 #include <net/if_gif.h>
131 #endif
132
133 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
134 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1]))
135
136 struct stf_softc {
137 struct ifnet sc_if; /* common area */
138 union {
139 struct route __sc_ro4;
140 struct route_in6 __sc_ro6; /* just for safety */
141 } __sc_ro46;
142 #define sc_ro __sc_ro46.__sc_ro4
143 const struct encaptab *encap_cookie;
144 LIST_ENTRY(stf_softc) sc_list;
145 };
146
147 static LIST_HEAD(, stf_softc) stf_softc_list;
148
149 static int stf_clone_create(struct if_clone *, int);
150 static int stf_clone_destroy(struct ifnet *);
151
152 struct if_clone stf_cloner =
153 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy);
154
155 #if NGIF > 0
156 extern int ip_gif_ttl; /*XXX*/
157 #else
158 static int ip_gif_ttl = 40; /*XXX*/
159 #endif
160
161 extern struct domain inetdomain;
162 static const struct protosw in_stf_protosw =
163 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR,
164 in_stf_input, rip_output, 0, rip_ctloutput,
165 rip_usrreq,
166 0, 0, 0, 0
167 };
168
169 void stfattach(int);
170
171 static int stf_encapcheck(struct mbuf *, int, int, void *);
172 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *);
173 static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *,
174 struct rtentry *);
175 static int isrfc1918addr(struct in_addr *);
176 static int stf_checkaddr4(struct stf_softc *, struct in_addr *,
177 struct ifnet *);
178 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *,
179 struct ifnet *);
180 static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
181 static int stf_ioctl(struct ifnet *, u_long, caddr_t);
182
183 /* ARGSUSED */
184 void
185 stfattach(int count)
186 {
187
188 LIST_INIT(&stf_softc_list);
189 if_clone_attach(&stf_cloner);
190 }
191
192 static int
193 stf_clone_create(struct if_clone *ifc, int unit)
194 {
195 struct stf_softc *sc;
196
197 if (LIST_FIRST(&stf_softc_list) != NULL) {
198 /* Only one stf interface is allowed. */
199 return (EEXIST);
200 }
201
202 sc = malloc(sizeof(struct stf_softc), M_DEVBUF, M_WAIT);
203 memset(sc, 0, sizeof(struct stf_softc));
204
205 snprintf(sc->sc_if.if_xname, sizeof(sc->sc_if.if_xname), "%s%d",
206 ifc->ifc_name, unit);
207
208 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6,
209 stf_encapcheck, &in_stf_protosw, sc);
210 if (sc->encap_cookie == NULL) {
211 printf("%s: unable to attach encap\n", if_name(&sc->sc_if));
212 free(sc, M_DEVBUF);
213 return (EIO); /* XXX */
214 }
215
216 sc->sc_if.if_mtu = STF_MTU;
217 sc->sc_if.if_flags = 0;
218 sc->sc_if.if_ioctl = stf_ioctl;
219 sc->sc_if.if_output = stf_output;
220 sc->sc_if.if_type = IFT_STF;
221 sc->sc_if.if_dlt = DLT_NULL;
222 if_attach(&sc->sc_if);
223 if_alloc_sadl(&sc->sc_if);
224 #if NBPFILTER > 0
225 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
226 #endif
227 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list);
228 return (0);
229 }
230
231 static int
232 stf_clone_destroy(struct ifnet *ifp)
233 {
234 struct stf_softc *sc = (void *) ifp;
235
236 LIST_REMOVE(sc, sc_list);
237 encap_detach(sc->encap_cookie);
238 #if NBPFILTER > 0
239 bpfdetach(ifp);
240 #endif
241 if_detach(ifp);
242 free(sc, M_DEVBUF);
243
244 return (0);
245 }
246
247 static int
248 stf_encapcheck(struct mbuf *m, int off, int proto, void *arg)
249 {
250 struct ip ip;
251 struct in6_ifaddr *ia6;
252 struct stf_softc *sc;
253 struct in_addr a, b;
254
255 sc = (struct stf_softc *)arg;
256 if (sc == NULL)
257 return 0;
258
259 if ((sc->sc_if.if_flags & IFF_UP) == 0)
260 return 0;
261
262 /* IFF_LINK0 means "no decapsulation" */
263 if ((sc->sc_if.if_flags & IFF_LINK0) != 0)
264 return 0;
265
266 if (proto != IPPROTO_IPV6)
267 return 0;
268
269 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
270
271 if (ip.ip_v != 4)
272 return 0;
273
274 ia6 = stf_getsrcifa6(&sc->sc_if);
275 if (ia6 == NULL)
276 return 0;
277
278 /*
279 * check if IPv4 dst matches the IPv4 address derived from the
280 * local 6to4 address.
281 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
282 */
283 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
284 sizeof(ip.ip_dst)) != 0)
285 return 0;
286
287 /*
288 * check if IPv4 src matches the IPv4 address derived from the
289 * local 6to4 address masked by prefixmask.
290 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
291 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
292 */
293 memset(&a, 0, sizeof(a));
294 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr;
295 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
296 b = ip.ip_src;
297 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
298 if (a.s_addr != b.s_addr)
299 return 0;
300
301 /* stf interface makes single side match only */
302 return 32;
303 }
304
305 static struct in6_ifaddr *
306 stf_getsrcifa6(struct ifnet *ifp)
307 {
308 struct ifaddr *ifa;
309 struct in_ifaddr *ia4;
310 struct sockaddr_in6 *sin6;
311 struct in_addr in;
312
313 IFADDR_FOREACH(ifa, ifp)
314 {
315 if (ifa->ifa_addr == NULL)
316 continue;
317 if (ifa->ifa_addr->sa_family != AF_INET6)
318 continue;
319 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
320 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
321 continue;
322
323 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
324 INADDR_TO_IA(in, ia4);
325 if (ia4 == NULL)
326 continue;
327
328 return (struct in6_ifaddr *)ifa;
329 }
330
331 return NULL;
332 }
333
334 static int
335 stf_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
336 struct rtentry *rt)
337 {
338 struct stf_softc *sc;
339 struct sockaddr_in6 *dst6;
340 struct in_addr *in4;
341 struct sockaddr_in *dst4;
342 u_int8_t tos;
343 struct ip *ip;
344 struct ip6_hdr *ip6;
345 struct in6_ifaddr *ia6;
346
347 sc = (struct stf_softc*)ifp;
348 dst6 = (struct sockaddr_in6 *)dst;
349
350 /* just in case */
351 if ((ifp->if_flags & IFF_UP) == 0) {
352 m_freem(m);
353 return ENETDOWN;
354 }
355
356 /*
357 * If we don't have an ip4 address that match my inner ip6 address,
358 * we shouldn't generate output. Without this check, we'll end up
359 * using wrong IPv4 source.
360 */
361 ia6 = stf_getsrcifa6(ifp);
362 if (ia6 == NULL) {
363 m_freem(m);
364 ifp->if_oerrors++;
365 return ENETDOWN;
366 }
367
368 if (m->m_len < sizeof(*ip6)) {
369 m = m_pullup(m, sizeof(*ip6));
370 if (m == NULL) {
371 ifp->if_oerrors++;
372 return ENOBUFS;
373 }
374 }
375 ip6 = mtod(m, struct ip6_hdr *);
376 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
377
378 /*
379 * Pickup the right outer dst addr from the list of candidates.
380 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
381 */
382 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
383 in4 = GET_V4(&ip6->ip6_dst);
384 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
385 in4 = GET_V4(&dst6->sin6_addr);
386 else {
387 m_freem(m);
388 ifp->if_oerrors++;
389 return ENETUNREACH;
390 }
391
392 #if NBPFILTER > 0
393 if (ifp->if_bpf)
394 bpf_mtap_af(ifp->if_bpf, AF_INET6, m);
395 #endif /*NBPFILTER > 0*/
396
397 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
398 if (m && m->m_len < sizeof(struct ip))
399 m = m_pullup(m, sizeof(struct ip));
400 if (m == NULL) {
401 ifp->if_oerrors++;
402 return ENOBUFS;
403 }
404 ip = mtod(m, struct ip *);
405
406 memset(ip, 0, sizeof(*ip));
407
408 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
409 &ip->ip_src, sizeof(ip->ip_src));
410 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst));
411 ip->ip_p = IPPROTO_IPV6;
412 ip->ip_ttl = ip_gif_ttl; /*XXX*/
413 ip->ip_len = htons(m->m_pkthdr.len);
414 if (ifp->if_flags & IFF_LINK1)
415 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
416 else
417 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
418
419 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst;
420 if (dst4->sin_family != AF_INET ||
421 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) {
422 /* cache route doesn't match */
423 dst4->sin_family = AF_INET;
424 dst4->sin_len = sizeof(struct sockaddr_in);
425 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr));
426 if (sc->sc_ro.ro_rt) {
427 RTFREE(sc->sc_ro.ro_rt);
428 sc->sc_ro.ro_rt = NULL;
429 }
430 }
431
432 if (sc->sc_ro.ro_rt == NULL) {
433 rtalloc(&sc->sc_ro);
434 if (sc->sc_ro.ro_rt == NULL) {
435 m_freem(m);
436 ifp->if_oerrors++;
437 return ENETUNREACH;
438 }
439 }
440
441 ifp->if_opackets++;
442 return ip_output(m, NULL, &sc->sc_ro, 0,
443 (struct ip_moptions *)NULL, (struct socket *)NULL);
444 }
445
446 static int
447 isrfc1918addr(struct in_addr *in)
448 {
449 /*
450 * returns 1 if private address range:
451 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
452 */
453 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 ||
454 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 ||
455 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)
456 return 1;
457
458 return 0;
459 }
460
461 static int
462 stf_checkaddr4(struct stf_softc *sc, struct in_addr *in,
463 struct ifnet *inifp /*incoming interface*/)
464 {
465 struct in_ifaddr *ia4;
466
467 /*
468 * reject packets with the following address:
469 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
470 */
471 if (IN_MULTICAST(in->s_addr))
472 return -1;
473 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
474 case 0: case 127: case 255:
475 return -1;
476 }
477
478 /*
479 * reject packets with private address range.
480 * (requirement from RFC3056 section 2 1st paragraph)
481 */
482 if (isrfc1918addr(in))
483 return -1;
484
485 /*
486 * reject packet with IPv4 link-local (169.254.0.0/16),
487 * as suggested in draft-savola-v6ops-6to4-security-00.txt
488 */
489 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 &&
490 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254)
491 return -1;
492
493 /*
494 * reject packets with broadcast
495 */
496 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list)
497 {
498 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
499 continue;
500 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
501 return -1;
502 }
503
504 /*
505 * perform ingress filter
506 */
507 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) {
508 struct sockaddr_in sin;
509 struct rtentry *rt;
510
511 memset(&sin, 0, sizeof(sin));
512 sin.sin_family = AF_INET;
513 sin.sin_len = sizeof(struct sockaddr_in);
514 sin.sin_addr = *in;
515 rt = rtalloc1((struct sockaddr *)&sin, 0);
516 if (!rt || rt->rt_ifp != inifp) {
517 #if 0
518 log(LOG_WARNING, "%s: packet from 0x%x dropped "
519 "due to ingress filter\n", if_name(&sc->sc_if),
520 (u_int32_t)ntohl(sin.sin_addr.s_addr));
521 #endif
522 if (rt)
523 rtfree(rt);
524 return -1;
525 }
526 rtfree(rt);
527 }
528
529 return 0;
530 }
531
532 static int
533 stf_checkaddr6(struct stf_softc *sc, struct in6_addr *in6,
534 struct ifnet *inifp /*incoming interface*/)
535 {
536
537 /*
538 * check 6to4 addresses
539 */
540 if (IN6_IS_ADDR_6TO4(in6))
541 return stf_checkaddr4(sc, GET_V4(in6), inifp);
542
543 /*
544 * reject anything that look suspicious. the test is implemented
545 * in ip6_input too, but we check here as well to
546 * (1) reject bad packets earlier, and
547 * (2) to be safe against future ip6_input change.
548 */
549 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
550 return -1;
551
552 /*
553 * reject link-local and site-local unicast
554 * as suggested in draft-savola-v6ops-6to4-security-00.txt
555 */
556 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6))
557 return -1;
558
559 /*
560 * reject node-local and link-local multicast
561 * as suggested in draft-savola-v6ops-6to4-security-00.txt
562 */
563 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6))
564 return -1;
565
566 return 0;
567 }
568
569 void
570 in_stf_input(struct mbuf *m, ...)
571 {
572 int off, proto;
573 struct stf_softc *sc;
574 struct ip *ip;
575 struct ip6_hdr *ip6;
576 u_int8_t otos, itos;
577 int s, isr;
578 struct ifqueue *ifq = NULL;
579 struct ifnet *ifp;
580 va_list ap;
581
582 va_start(ap, m);
583 off = va_arg(ap, int);
584 proto = va_arg(ap, int);
585 va_end(ap);
586
587 if (proto != IPPROTO_IPV6) {
588 m_freem(m);
589 return;
590 }
591
592 ip = mtod(m, struct ip *);
593
594 sc = (struct stf_softc *)encap_getarg(m);
595
596 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) {
597 m_freem(m);
598 return;
599 }
600
601 ifp = &sc->sc_if;
602
603 /*
604 * perform sanity check against outer src/dst.
605 * for source, perform ingress filter as well.
606 */
607 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
608 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) {
609 m_freem(m);
610 return;
611 }
612
613 otos = ip->ip_tos;
614 m_adj(m, off);
615
616 if (m->m_len < sizeof(*ip6)) {
617 m = m_pullup(m, sizeof(*ip6));
618 if (!m)
619 return;
620 }
621 ip6 = mtod(m, struct ip6_hdr *);
622
623 /*
624 * perform sanity check against inner src/dst.
625 * for source, perform ingress filter as well.
626 */
627 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
628 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) {
629 m_freem(m);
630 return;
631 }
632
633 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
634 if ((ifp->if_flags & IFF_LINK1) != 0)
635 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
636 else
637 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
638 ip6->ip6_flow &= ~htonl(0xff << 20);
639 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
640
641 m->m_pkthdr.rcvif = ifp;
642
643 #if NBPFILTER > 0
644 if (ifp->if_bpf)
645 bpf_mtap_af(ifp->if_bpf, AF_INET6, m);
646 #endif /*NBPFILTER > 0*/
647
648 /*
649 * Put the packet to the network layer input queue according to the
650 * specified address family.
651 * See net/if_gif.c for possible issues with packet processing
652 * reorder due to extra queueing.
653 */
654 ifq = &ip6intrq;
655 isr = NETISR_IPV6;
656
657 s = splnet();
658 if (IF_QFULL(ifq)) {
659 IF_DROP(ifq); /* update statistics */
660 m_freem(m);
661 splx(s);
662 return;
663 }
664 IF_ENQUEUE(ifq, m);
665 schednetisr(isr);
666 ifp->if_ipackets++;
667 ifp->if_ibytes += m->m_pkthdr.len;
668 splx(s);
669 }
670
671 /* ARGSUSED */
672 static void
673 stf_rtrequest(int cmd, struct rtentry *rt,
674 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
684 static int
685 stf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
686 {
687 struct lwp *l = curlwp; /* XXX */
688 struct ifaddr *ifa;
689 struct ifreq *ifr;
690 struct sockaddr_in6 *sin6;
691 int error;
692 u_long mtu;
693
694 error = 0;
695 switch (cmd) {
696 case SIOCSIFADDR:
697 ifa = (struct ifaddr *)data;
698 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
699 error = EAFNOSUPPORT;
700 break;
701 }
702 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
703 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) &&
704 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) {
705 ifa->ifa_rtrequest = stf_rtrequest;
706 ifp->if_flags |= IFF_UP;
707 } else
708 error = EINVAL;
709 break;
710
711 case SIOCADDMULTI:
712 case SIOCDELMULTI:
713 ifr = (struct ifreq *)data;
714 if (ifr != NULL && ifr->ifr_addr.sa_family == AF_INET6)
715 ;
716 else
717 error = EAFNOSUPPORT;
718 break;
719
720 case SIOCSIFMTU:
721 if ((error = kauth_authorize_generic(l->l_cred,
722 KAUTH_GENERIC_ISSUSER, &l->l_acflag)) != 0)
723 break;
724 ifr = (struct ifreq *)data;
725 mtu = ifr->ifr_mtu;
726 if (mtu < STF_MTU_MIN || mtu > STF_MTU_MAX)
727 return EINVAL;
728 ifp->if_mtu = mtu;
729 break;
730
731 default:
732 error = EINVAL;
733 break;
734 }
735
736 return error;
737 }
Cache object: 182ca6a29002aa637ead45693cf64b27
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