FreeBSD/Linux Kernel Cross Reference
sys/net/if_stf.c
1 /* $NetBSD: if_stf.c,v 1.46 2005/03/11 13:28:25 tron 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 1.46 2005/03/11 13:28:25 tron 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 <machine/cpu.h>
94
95 #include <net/if.h>
96 #include <net/route.h>
97 #include <net/netisr.h>
98 #include <net/if_types.h>
99 #include <net/if_stf.h>
100
101 #include <netinet/in.h>
102 #include <netinet/in_systm.h>
103 #include <netinet/ip.h>
104 #include <netinet/ip_var.h>
105 #include <netinet/in_var.h>
106
107 #include <netinet/ip6.h>
108 #include <netinet6/ip6_var.h>
109 #include <netinet6/in6_gif.h>
110 #include <netinet6/in6_var.h>
111 #include <netinet/ip_ecn.h>
112
113 #include <netinet/ip_encap.h>
114
115 #include <machine/stdarg.h>
116
117 #include <net/net_osdep.h>
118
119 #include "bpfilter.h"
120 #include "stf.h"
121 #include "gif.h" /*XXX*/
122
123 #if NBPFILTER > 0
124 #include <net/bpf.h>
125 #endif
126
127 #if NGIF > 0
128 #include <net/if_gif.h>
129 #endif
130
131 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
132 #define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1]))
133
134 struct stf_softc {
135 struct ifnet sc_if; /* common area */
136 union {
137 struct route __sc_ro4;
138 struct route_in6 __sc_ro6; /* just for safety */
139 } __sc_ro46;
140 #define sc_ro __sc_ro46.__sc_ro4
141 const struct encaptab *encap_cookie;
142 LIST_ENTRY(stf_softc) sc_list;
143 };
144
145 LIST_HEAD(, stf_softc) stf_softc_list;
146
147 int stf_clone_create __P((struct if_clone *, int));
148 int stf_clone_destroy __P((struct ifnet *));
149
150 struct if_clone stf_cloner =
151 IF_CLONE_INITIALIZER("stf", stf_clone_create, stf_clone_destroy);
152
153 #if NGIF > 0
154 extern int ip_gif_ttl; /*XXX*/
155 #else
156 static int ip_gif_ttl = 40; /*XXX*/
157 #endif
158
159 extern struct domain inetdomain;
160 const struct protosw in_stf_protosw =
161 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR,
162 in_stf_input, rip_output, 0, rip_ctloutput,
163 rip_usrreq,
164 0, 0, 0, 0
165 };
166
167 void stfattach __P((int));
168 static int stf_encapcheck __P((const struct mbuf *, int, int, void *));
169 static struct in6_ifaddr *stf_getsrcifa6 __P((struct ifnet *));
170 static int stf_output __P((struct ifnet *, struct mbuf *, struct sockaddr *,
171 struct rtentry *));
172 static int isrfc1918addr __P((struct in_addr *));
173 static int stf_checkaddr4 __P((struct stf_softc *, struct in_addr *,
174 struct ifnet *));
175 static int stf_checkaddr6 __P((struct stf_softc *, struct in6_addr *,
176 struct ifnet *));
177 static void stf_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *));
178 static int stf_ioctl __P((struct ifnet *, u_long, caddr_t));
179
180 /* ARGSUSED */
181 void
182 stfattach(count)
183 int count;
184 {
185
186 LIST_INIT(&stf_softc_list);
187 if_clone_attach(&stf_cloner);
188 }
189
190 int
191 stf_clone_create(ifc, unit)
192 struct if_clone *ifc;
193 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 int
232 stf_clone_destroy(ifp)
233 struct ifnet *ifp;
234 {
235 struct stf_softc *sc = (void *) ifp;
236
237 LIST_REMOVE(sc, sc_list);
238 encap_detach(sc->encap_cookie);
239 #if NBPFILTER > 0
240 bpfdetach(ifp);
241 #endif
242 if_detach(ifp);
243 free(sc, M_DEVBUF);
244
245 return (0);
246 }
247
248 static int
249 stf_encapcheck(m, off, proto, arg)
250 const struct mbuf *m;
251 int off;
252 int proto;
253 void *arg;
254 {
255 struct ip ip;
256 struct in6_ifaddr *ia6;
257 struct stf_softc *sc;
258 struct in_addr a, b;
259
260 sc = (struct stf_softc *)arg;
261 if (sc == NULL)
262 return 0;
263
264 if ((sc->sc_if.if_flags & IFF_UP) == 0)
265 return 0;
266
267 /* IFF_LINK0 means "no decapsulation" */
268 if ((sc->sc_if.if_flags & IFF_LINK0) != 0)
269 return 0;
270
271 if (proto != IPPROTO_IPV6)
272 return 0;
273
274 /* LINTED const cast */
275 m_copydata((struct mbuf *)m, 0, sizeof(ip), (caddr_t)&ip);
276
277 if (ip.ip_v != 4)
278 return 0;
279
280 ia6 = stf_getsrcifa6(&sc->sc_if);
281 if (ia6 == NULL)
282 return 0;
283
284 /*
285 * check if IPv4 dst matches the IPv4 address derived from the
286 * local 6to4 address.
287 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
288 */
289 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
290 sizeof(ip.ip_dst)) != 0)
291 return 0;
292
293 /*
294 * check if IPv4 src matches the IPv4 address derived from the
295 * local 6to4 address masked by prefixmask.
296 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
297 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
298 */
299 memset(&a, 0, sizeof(a));
300 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr;
301 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
302 b = ip.ip_src;
303 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
304 if (a.s_addr != b.s_addr)
305 return 0;
306
307 /* stf interface makes single side match only */
308 return 32;
309 }
310
311 static struct in6_ifaddr *
312 stf_getsrcifa6(ifp)
313 struct ifnet *ifp;
314 {
315 struct ifaddr *ifa;
316 struct in_ifaddr *ia4;
317 struct sockaddr_in6 *sin6;
318 struct in_addr in;
319
320 IFADDR_FOREACH(ifa, ifp)
321 {
322 if (ifa->ifa_addr == NULL)
323 continue;
324 if (ifa->ifa_addr->sa_family != AF_INET6)
325 continue;
326 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
327 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
328 continue;
329
330 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
331 INADDR_TO_IA(in, ia4);
332 if (ia4 == NULL)
333 continue;
334
335 return (struct in6_ifaddr *)ifa;
336 }
337
338 return NULL;
339 }
340
341 static int
342 stf_output(ifp, m, dst, rt)
343 struct ifnet *ifp;
344 struct mbuf *m;
345 struct sockaddr *dst;
346 struct rtentry *rt;
347 {
348 struct stf_softc *sc;
349 struct sockaddr_in6 *dst6;
350 struct in_addr *in4;
351 struct sockaddr_in *dst4;
352 u_int8_t tos;
353 struct ip *ip;
354 struct ip6_hdr *ip6;
355 struct in6_ifaddr *ia6;
356
357 sc = (struct stf_softc*)ifp;
358 dst6 = (struct sockaddr_in6 *)dst;
359
360 /* just in case */
361 if ((ifp->if_flags & IFF_UP) == 0) {
362 m_freem(m);
363 return ENETDOWN;
364 }
365
366 /*
367 * If we don't have an ip4 address that match my inner ip6 address,
368 * we shouldn't generate output. Without this check, we'll end up
369 * using wrong IPv4 source.
370 */
371 ia6 = stf_getsrcifa6(ifp);
372 if (ia6 == NULL) {
373 m_freem(m);
374 ifp->if_oerrors++;
375 return ENETDOWN;
376 }
377
378 if (m->m_len < sizeof(*ip6)) {
379 m = m_pullup(m, sizeof(*ip6));
380 if (m == NULL) {
381 ifp->if_oerrors++;
382 return ENOBUFS;
383 }
384 }
385 ip6 = mtod(m, struct ip6_hdr *);
386 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
387
388 /*
389 * Pickup the right outer dst addr from the list of candidates.
390 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
391 */
392 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
393 in4 = GET_V4(&ip6->ip6_dst);
394 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
395 in4 = GET_V4(&dst6->sin6_addr);
396 else {
397 m_freem(m);
398 ifp->if_oerrors++;
399 return ENETUNREACH;
400 }
401
402 #if NBPFILTER > 0
403 if (ifp->if_bpf)
404 bpf_mtap_af(ifp->if_bpf, AF_INET6, m);
405 #endif /*NBPFILTER > 0*/
406
407 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
408 if (m && m->m_len < sizeof(struct ip))
409 m = m_pullup(m, sizeof(struct ip));
410 if (m == NULL) {
411 ifp->if_oerrors++;
412 return ENOBUFS;
413 }
414 ip = mtod(m, struct ip *);
415
416 memset(ip, 0, sizeof(*ip));
417
418 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
419 &ip->ip_src, sizeof(ip->ip_src));
420 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst));
421 ip->ip_p = IPPROTO_IPV6;
422 ip->ip_ttl = ip_gif_ttl; /*XXX*/
423 ip->ip_len = htons(m->m_pkthdr.len);
424 if (ifp->if_flags & IFF_LINK1)
425 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
426 else
427 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
428
429 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst;
430 if (dst4->sin_family != AF_INET ||
431 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) {
432 /* cache route doesn't match */
433 dst4->sin_family = AF_INET;
434 dst4->sin_len = sizeof(struct sockaddr_in);
435 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr));
436 if (sc->sc_ro.ro_rt) {
437 RTFREE(sc->sc_ro.ro_rt);
438 sc->sc_ro.ro_rt = NULL;
439 }
440 }
441
442 if (sc->sc_ro.ro_rt == NULL) {
443 rtalloc(&sc->sc_ro);
444 if (sc->sc_ro.ro_rt == NULL) {
445 m_freem(m);
446 ifp->if_oerrors++;
447 return ENETUNREACH;
448 }
449 }
450
451 ifp->if_opackets++;
452 return ip_output(m, NULL, &sc->sc_ro, 0,
453 (struct ip_moptions *)NULL, (struct socket *)NULL);
454 }
455
456 static int
457 isrfc1918addr(in)
458 struct in_addr *in;
459 {
460 /*
461 * returns 1 if private address range:
462 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
463 */
464 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 ||
465 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 ||
466 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)
467 return 1;
468
469 return 0;
470 }
471
472 static int
473 stf_checkaddr4(sc, in, inifp)
474 struct stf_softc *sc;
475 struct in_addr *in;
476 struct ifnet *inifp; /* incoming interface */
477 {
478 struct in_ifaddr *ia4;
479
480 /*
481 * reject packets with the following address:
482 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
483 */
484 if (IN_MULTICAST(in->s_addr))
485 return -1;
486 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
487 case 0: case 127: case 255:
488 return -1;
489 }
490
491 /*
492 * reject packets with private address range.
493 * (requirement from RFC3056 section 2 1st paragraph)
494 */
495 if (isrfc1918addr(in))
496 return -1;
497
498 /*
499 * reject packet with IPv4 link-local (169.254.0.0/16),
500 * as suggested in draft-savola-v6ops-6to4-security-00.txt
501 */
502 if (((ntohl(in->s_addr) & 0xff000000) >> 24) == 169 &&
503 ((ntohl(in->s_addr) & 0x00ff0000) >> 16) == 254)
504 return -1;
505
506 /*
507 * reject packets with broadcast
508 */
509 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_list)
510 {
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 (u_int32_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
545 static int
546 stf_checkaddr6(sc, in6, inifp)
547 struct stf_softc *sc;
548 struct in6_addr *in6;
549 struct ifnet *inifp; /* incoming interface */
550 {
551
552 /*
553 * check 6to4 addresses
554 */
555 if (IN6_IS_ADDR_6TO4(in6))
556 return stf_checkaddr4(sc, GET_V4(in6), inifp);
557
558 /*
559 * reject anything that look suspicious. the test is implemented
560 * in ip6_input too, but we check here as well to
561 * (1) reject bad packets earlier, and
562 * (2) to be safe against future ip6_input change.
563 */
564 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
565 return -1;
566
567 /*
568 * reject link-local and site-local unicast
569 * as suggested in draft-savola-v6ops-6to4-security-00.txt
570 */
571 if (IN6_IS_ADDR_LINKLOCAL(in6) || IN6_IS_ADDR_SITELOCAL(in6))
572 return -1;
573
574 /*
575 * reject node-local and link-local multicast
576 * as suggested in draft-savola-v6ops-6to4-security-00.txt
577 */
578 if (IN6_IS_ADDR_MC_NODELOCAL(in6) || IN6_IS_ADDR_MC_LINKLOCAL(in6))
579 return -1;
580
581 return 0;
582 }
583
584 void
585 in_stf_input(struct mbuf *m, ...)
586 {
587 int off, proto;
588 struct stf_softc *sc;
589 struct ip *ip;
590 struct ip6_hdr *ip6;
591 u_int8_t otos, itos;
592 int s, isr;
593 struct ifqueue *ifq = NULL;
594 struct ifnet *ifp;
595 va_list ap;
596
597 va_start(ap, m);
598 off = va_arg(ap, int);
599 proto = va_arg(ap, int);
600 va_end(ap);
601
602 if (proto != IPPROTO_IPV6) {
603 m_freem(m);
604 return;
605 }
606
607 ip = mtod(m, struct ip *);
608
609 sc = (struct stf_softc *)encap_getarg(m);
610
611 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) {
612 m_freem(m);
613 return;
614 }
615
616 ifp = &sc->sc_if;
617
618 /*
619 * perform sanity check against outer src/dst.
620 * for source, perform ingress filter as well.
621 */
622 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
623 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) {
624 m_freem(m);
625 return;
626 }
627
628 otos = ip->ip_tos;
629 m_adj(m, off);
630
631 if (m->m_len < sizeof(*ip6)) {
632 m = m_pullup(m, sizeof(*ip6));
633 if (!m)
634 return;
635 }
636 ip6 = mtod(m, struct ip6_hdr *);
637
638 /*
639 * perform sanity check against inner src/dst.
640 * for source, perform ingress filter as well.
641 */
642 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
643 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) {
644 m_freem(m);
645 return;
646 }
647
648 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
649 if ((ifp->if_flags & IFF_LINK1) != 0)
650 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
651 else
652 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
653 ip6->ip6_flow &= ~htonl(0xff << 20);
654 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
655
656 m->m_pkthdr.rcvif = ifp;
657
658 #if NBPFILTER > 0
659 if (ifp->if_bpf)
660 bpf_mtap_af(ifp->if_bpf, AF_INET6, m);
661 #endif /*NBPFILTER > 0*/
662
663 /*
664 * Put the packet to the network layer input queue according to the
665 * specified address family.
666 * See net/if_gif.c for possible issues with packet processing
667 * reorder due to extra queueing.
668 */
669 ifq = &ip6intrq;
670 isr = NETISR_IPV6;
671
672 s = splnet();
673 if (IF_QFULL(ifq)) {
674 IF_DROP(ifq); /* update statistics */
675 m_freem(m);
676 splx(s);
677 return;
678 }
679 IF_ENQUEUE(ifq, m);
680 schednetisr(isr);
681 ifp->if_ipackets++;
682 ifp->if_ibytes += m->m_pkthdr.len;
683 splx(s);
684 }
685
686 /* ARGSUSED */
687 static void
688 stf_rtrequest(cmd, rt, info)
689 int cmd;
690 struct rtentry *rt;
691 struct rt_addrinfo *info;
692 {
693 if (rt != NULL) {
694 struct stf_softc *sc;
695
696 sc = LIST_FIRST(&stf_softc_list);
697 rt->rt_rmx.rmx_mtu = (sc != NULL) ? sc->sc_if.if_mtu : STF_MTU;
698 }
699 }
700
701 static int
702 stf_ioctl(ifp, cmd, data)
703 struct ifnet *ifp;
704 u_long cmd;
705 caddr_t data;
706 {
707 struct proc *p = curproc; /* XXX */
708 struct ifaddr *ifa;
709 struct ifreq *ifr;
710 struct sockaddr_in6 *sin6;
711 int error;
712 u_long mtu;
713
714 error = 0;
715 switch (cmd) {
716 case SIOCSIFADDR:
717 ifa = (struct ifaddr *)data;
718 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
719 error = EAFNOSUPPORT;
720 break;
721 }
722 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
723 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr) &&
724 !isrfc1918addr(GET_V4(&sin6->sin6_addr))) {
725 ifa->ifa_rtrequest = stf_rtrequest;
726 ifp->if_flags |= IFF_UP;
727 } else
728 error = EINVAL;
729 break;
730
731 case SIOCADDMULTI:
732 case SIOCDELMULTI:
733 ifr = (struct ifreq *)data;
734 if (ifr != NULL && ifr->ifr_addr.sa_family == AF_INET6)
735 ;
736 else
737 error = EAFNOSUPPORT;
738 break;
739
740 case SIOCSIFMTU:
741 if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
742 break;
743 ifr = (struct ifreq *)data;
744 mtu = ifr->ifr_mtu;
745 if (mtu < STF_MTU_MIN || mtu > STF_MTU_MAX)
746 return EINVAL;
747 ifp->if_mtu = mtu;
748 break;
749
750 default:
751 error = EINVAL;
752 break;
753 }
754
755 return error;
756 }
Cache object: 4ed648d77bb9026c035551c7c914134a
|