Make all network interrupt service routines MPSAFE part 1/3.
[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 $ */
78195a76 2/* $DragonFly: src/sys/net/stf/if_stf.c,v 1.15 2005/11/28 17:13:46 dillon 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>
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102#include <netinet/ip_var.h>
103#include <netinet/in_var.h>
104
105#include <netinet/ip6.h>
106#include <netinet6/ip6_var.h>
107#include <netinet6/in6_var.h>
108#include <netinet/ip_ecn.h>
109
110#include <netinet/ip_encap.h>
111
112#include <machine/stdarg.h>
113
114#include <net/net_osdep.h>
115
116#include <net/bpf.h>
117
118#define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
119#define GET_V4(x) ((struct in_addr *)(&(x)->s6_addr16[1]))
120
121struct stf_softc {
122 struct ifnet sc_if; /* common area */
123 union {
124 struct route __sc_ro4;
125 struct route_in6 __sc_ro6; /* just for safety */
126 } __sc_ro46;
127#define sc_ro __sc_ro46.__sc_ro4
128 const struct encaptab *encap_cookie;
129};
130
131static struct stf_softc *stf;
132
133static MALLOC_DEFINE(M_STF, "stf", "6to4 Tunnel Interface");
134static int ip_stf_ttl = 40;
135
136extern struct domain inetdomain;
4468b0b4 137struct protosw in_stf_protosw =
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138{ SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR,
139 in_stf_input, rip_output, 0, rip_ctloutput,
140 0,
141 0, 0, 0, 0,
142 &rip_usrreqs
143};
144
158abb01
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145static int stfmodevent (module_t, int, void *);
146static int stf_encapcheck (const struct mbuf *, int, int, void *);
147static struct in6_ifaddr *stf_getsrcifa6 (struct ifnet *);
148static int stf_output (struct ifnet *, struct mbuf *, struct sockaddr *,
149 struct rtentry *);
150static int stf_checkaddr4 (struct stf_softc *, struct in_addr *,
151 struct ifnet *);
152static int stf_checkaddr6 (struct stf_softc *, struct in6_addr *,
153 struct ifnet *);
154static void stf_rtrequest (int, struct rtentry *, struct rt_addrinfo *);
bd4539cc 155static int stf_ioctl (struct ifnet *, u_long, caddr_t, struct ucred *);
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156
157static int
158stfmodevent(mod, type, data)
159 module_t mod;
160 int type;
161 void *data;
162{
163 struct stf_softc *sc;
164 int err;
165 const struct encaptab *p;
166
167 switch (type) {
168 case MOD_LOAD:
169 stf = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK);
170 bzero(stf, sizeof(struct stf_softc));
171 sc = stf;
172
173 bzero(sc, sizeof(*sc));
cdb7d804 174 if_initname(&(sc->sc_if), "stf", 0);
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175
176 p = encap_attach_func(AF_INET, IPPROTO_IPV6, stf_encapcheck,
f15db79e 177 (void *)&in_stf_protosw, sc);
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178 if (p == NULL) {
179 printf("%s: attach failed\n", if_name(&sc->sc_if));
180 return (ENOMEM);
181 }
182 sc->encap_cookie = p;
183
184 sc->sc_if.if_mtu = IPV6_MMTU;
185 sc->sc_if.if_flags = 0;
186 sc->sc_if.if_ioctl = stf_ioctl;
187 sc->sc_if.if_output = stf_output;
188 sc->sc_if.if_type = IFT_STF;
189#if 0
190 /* turn off ingress filter */
191 sc->sc_if.if_flags |= IFF_LINK2;
192#endif
193 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
78195a76 194 if_attach(&sc->sc_if, NULL);
984263bc 195 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
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196 break;
197 case MOD_UNLOAD:
198 sc = stf;
199 bpfdetach(&sc->sc_if);
200 if_detach(&sc->sc_if);
201 err = encap_detach(sc->encap_cookie);
202 KASSERT(err == 0, ("Unexpected error detaching encap_cookie"));
203 free(sc, M_STF);
204 break;
205 }
206
207 return (0);
208}
209
210static moduledata_t stf_mod = {
211 "if_stf",
212 stfmodevent,
213 0
214};
215
216DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
217
218static int
219stf_encapcheck(m, off, proto, arg)
220 const struct mbuf *m;
221 int off;
222 int proto;
223 void *arg;
224{
225 struct ip ip;
226 struct in6_ifaddr *ia6;
227 struct stf_softc *sc;
228 struct in_addr a, b;
229
230 sc = (struct stf_softc *)arg;
231 if (sc == NULL)
232 return 0;
233
234 if ((sc->sc_if.if_flags & IFF_UP) == 0)
235 return 0;
236
237 /* IFF_LINK0 means "no decapsulation" */
238 if ((sc->sc_if.if_flags & IFF_LINK0) != 0)
239 return 0;
240
241 if (proto != IPPROTO_IPV6)
242 return 0;
243
f15db79e 244 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
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245
246 if (ip.ip_v != 4)
247 return 0;
248
249 ia6 = stf_getsrcifa6(&sc->sc_if);
250 if (ia6 == NULL)
251 return 0;
252
253 /*
254 * check if IPv4 dst matches the IPv4 address derived from the
255 * local 6to4 address.
256 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
257 */
258 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
259 sizeof(ip.ip_dst)) != 0)
260 return 0;
261
262 /*
263 * check if IPv4 src matches the IPv4 address derived from the
264 * local 6to4 address masked by prefixmask.
265 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
266 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
267 */
268 bzero(&a, sizeof(a));
269 a.s_addr = GET_V4(&ia6->ia_addr.sin6_addr)->s_addr;
270 a.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
271 b = ip.ip_src;
272 b.s_addr &= GET_V4(&ia6->ia_prefixmask.sin6_addr)->s_addr;
273 if (a.s_addr != b.s_addr)
274 return 0;
275
276 /* stf interface makes single side match only */
277 return 32;
278}
279
280static struct in6_ifaddr *
281stf_getsrcifa6(ifp)
282 struct ifnet *ifp;
283{
284 struct ifaddr *ia;
285 struct in_ifaddr *ia4;
286 struct sockaddr_in6 *sin6;
287 struct in_addr in;
288
289 TAILQ_FOREACH(ia, &ifp->if_addrlist, ifa_list) {
290 if (ia->ifa_addr == NULL)
291 continue;
292 if (ia->ifa_addr->sa_family != AF_INET6)
293 continue;
294 sin6 = (struct sockaddr_in6 *)ia->ifa_addr;
295 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
296 continue;
297
298 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
299 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash)
300 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr)
301 break;
302 if (ia4 == NULL)
303 continue;
304
305 return (struct in6_ifaddr *)ia;
306 }
307
308 return NULL;
309}
310
311static int
312stf_output(ifp, m, dst, rt)
313 struct ifnet *ifp;
314 struct mbuf *m;
315 struct sockaddr *dst;
316 struct rtentry *rt;
317{
318 struct stf_softc *sc;
319 struct sockaddr_in6 *dst6;
320 struct in_addr *in4;
321 struct sockaddr_in *dst4;
322 u_int8_t tos;
323 struct ip *ip;
324 struct ip6_hdr *ip6;
325 struct in6_ifaddr *ia6;
1f8e62c9 326 static const uint32_t af = AF_INET6;
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327
328 sc = (struct stf_softc*)ifp;
329 dst6 = (struct sockaddr_in6 *)dst;
330
331 /* just in case */
332 if ((ifp->if_flags & IFF_UP) == 0) {
333 m_freem(m);
334 return ENETDOWN;
335 }
336
337 /*
338 * If we don't have an ip4 address that match my inner ip6 address,
339 * we shouldn't generate output. Without this check, we'll end up
340 * using wrong IPv4 source.
341 */
342 ia6 = stf_getsrcifa6(ifp);
343 if (ia6 == NULL) {
344 m_freem(m);
345 return ENETDOWN;
346 }
347
348 if (m->m_len < sizeof(*ip6)) {
349 m = m_pullup(m, sizeof(*ip6));
350 if (!m)
351 return ENOBUFS;
352 }
353 ip6 = mtod(m, struct ip6_hdr *);
354 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
355
356 /*
357 * Pickup the right outer dst addr from the list of candidates.
358 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
359 */
360 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
361 in4 = GET_V4(&ip6->ip6_dst);
362 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
363 in4 = GET_V4(&dst6->sin6_addr);
364 else {
365 m_freem(m);
366 return ENETUNREACH;
367 }
368
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369 if (ifp->if_bpf)
370 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
984263bc 371
74f1caca 372 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
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373 if (m && m->m_len < sizeof(struct ip))
374 m = m_pullup(m, sizeof(struct ip));
375 if (m == NULL)
376 return ENOBUFS;
377 ip = mtod(m, struct ip *);
378
379 bzero(ip, sizeof(*ip));
380
381 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
382 &ip->ip_src, sizeof(ip->ip_src));
383 bcopy(in4, &ip->ip_dst, sizeof(ip->ip_dst));
384 ip->ip_p = IPPROTO_IPV6;
385 ip->ip_ttl = ip_stf_ttl;
386 ip->ip_len = m->m_pkthdr.len; /*host order*/
387 if (ifp->if_flags & IFF_LINK1)
388 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
389 else
390 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
391
392 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst;
393 if (dst4->sin_family != AF_INET ||
394 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) {
395 /* cache route doesn't match */
396 dst4->sin_family = AF_INET;
397 dst4->sin_len = sizeof(struct sockaddr_in);
398 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr));
399 if (sc->sc_ro.ro_rt) {
400 RTFREE(sc->sc_ro.ro_rt);
401 sc->sc_ro.ro_rt = NULL;
402 }
403 }
404
405 if (sc->sc_ro.ro_rt == NULL) {
406 rtalloc(&sc->sc_ro);
407 if (sc->sc_ro.ro_rt == NULL) {
408 m_freem(m);
409 return ENETUNREACH;
410 }
411 }
412
413 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
414}
415
416static int
417stf_checkaddr4(sc, in, inifp)
418 struct stf_softc *sc;
419 struct in_addr *in;
420 struct ifnet *inifp; /* incoming interface */
421{
422 struct in_ifaddr *ia4;
423
424 /*
425 * reject packets with the following address:
426 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
427 */
428 if (IN_MULTICAST(ntohl(in->s_addr)))
429 return -1;
430 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
431 case 0: case 127: case 255:
432 return -1;
433 }
434
435 /*
436 * reject packets with broadcast
437 */
438 for (ia4 = TAILQ_FIRST(&in_ifaddrhead);
439 ia4;
440 ia4 = TAILQ_NEXT(ia4, ia_link))
441 {
442 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
443 continue;
444 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
445 return -1;
446 }
447
448 /*
449 * perform ingress filter
450 */
451 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) {
452 struct sockaddr_in sin;
453 struct rtentry *rt;
454
455 bzero(&sin, sizeof(sin));
456 sin.sin_family = AF_INET;
457 sin.sin_len = sizeof(struct sockaddr_in);
458 sin.sin_addr = *in;
a0720452 459 rt = rtpurelookup((struct sockaddr *)&sin);
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460 if (!rt || rt->rt_ifp != inifp) {
461#if 0
462 log(LOG_WARNING, "%s: packet from 0x%x dropped "
463 "due to ingress filter\n", if_name(&sc->sc_if),
464 (u_int32_t)ntohl(sin.sin_addr.s_addr));
465#endif
466 if (rt)
467 rtfree(rt);
468 return -1;
469 }
470 rtfree(rt);
471 }
472
473 return 0;
474}
475
476static int
477stf_checkaddr6(sc, in6, inifp)
478 struct stf_softc *sc;
479 struct in6_addr *in6;
480 struct ifnet *inifp; /* incoming interface */
481{
482 /*
483 * check 6to4 addresses
484 */
485 if (IN6_IS_ADDR_6TO4(in6))
486 return stf_checkaddr4(sc, GET_V4(in6), inifp);
487
488 /*
489 * reject anything that look suspicious. the test is implemented
490 * in ip6_input too, but we check here as well to
491 * (1) reject bad packets earlier, and
492 * (2) to be safe against future ip6_input change.
493 */
494 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
495 return -1;
496
497 return 0;
498}
499
500void
a00138cb 501in_stf_input(struct mbuf *m, ...)
984263bc 502{
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503 struct stf_softc *sc;
504 struct ip *ip;
505 struct ip6_hdr *ip6;
506 u_int8_t otos, itos;
984263bc 507 struct ifnet *ifp;
a00138cb 508 int off, proto;
1f8e62c9 509 static const uint32_t af = AF_INET6;
a00138cb
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510 __va_list ap;
511
512 __va_start(ap, m);
513 off = __va_arg(ap, int);
514 proto = __va_arg(ap, int);
515 __va_end(ap);
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516
517 if (proto != IPPROTO_IPV6) {
518 m_freem(m);
519 return;
520 }
521
522 ip = mtod(m, struct ip *);
523
524 sc = (struct stf_softc *)encap_getarg(m);
525
526 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) {
527 m_freem(m);
528 return;
529 }
530
531 ifp = &sc->sc_if;
532
533 /*
534 * perform sanity check against outer src/dst.
535 * for source, perform ingress filter as well.
536 */
537 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
538 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) {
539 m_freem(m);
540 return;
541 }
542
543 otos = ip->ip_tos;
544 m_adj(m, off);
545
546 if (m->m_len < sizeof(*ip6)) {
547 m = m_pullup(m, sizeof(*ip6));
548 if (!m)
549 return;
550 }
551 ip6 = mtod(m, struct ip6_hdr *);
552
553 /*
554 * perform sanity check against inner src/dst.
555 * for source, perform ingress filter as well.
556 */
557 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
558 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) {
559 m_freem(m);
560 return;
561 }
562
563 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
564 if ((ifp->if_flags & IFF_LINK1) != 0)
565 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
566 else
567 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
568 ip6->ip6_flow &= ~htonl(0xff << 20);
569 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
570
571 m->m_pkthdr.rcvif = ifp;
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572
573 if (ifp->if_bpf)
574 bpf_ptap(ifp->if_bpf, m, &af, sizeof(af));
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575
576 /*
577 * Put the packet to the network layer input queue according to the
578 * specified address family.
579 * See net/if_gif.c for possible issues with packet processing
580 * reorder due to extra queueing.
581 */
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582 ifp->if_ipackets++;
583 ifp->if_ibytes += m->m_pkthdr.len;
f45600ee 584 netisr_dispatch(NETISR_IPV6, m);
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585}
586
587/* ARGSUSED */
588static void
589stf_rtrequest(cmd, rt, info)
590 int cmd;
591 struct rtentry *rt;
592 struct rt_addrinfo *info;
593{
594
595 if (rt)
596 rt->rt_rmx.rmx_mtu = IPV6_MMTU;
597}
598
599static int
bd4539cc 600stf_ioctl(ifp, cmd, data, cr)
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601 struct ifnet *ifp;
602 u_long cmd;
603 caddr_t data;
bd4539cc 604 struct ucred *cr;
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605{
606 struct ifaddr *ifa;
607 struct ifreq *ifr;
608 struct sockaddr_in6 *sin6;
609 int error;
610
611 error = 0;
612 switch (cmd) {
613 case SIOCSIFADDR:
614 ifa = (struct ifaddr *)data;
615 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
616 error = EAFNOSUPPORT;
617 break;
618 }
619 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
620 if (IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) {
621 ifa->ifa_rtrequest = stf_rtrequest;
622 ifp->if_flags |= IFF_UP;
623 } else
624 error = EINVAL;
625 break;
626
627 case SIOCADDMULTI:
628 case SIOCDELMULTI:
629 ifr = (struct ifreq *)data;
630 if (ifr && ifr->ifr_addr.sa_family == AF_INET6)
631 ;
632 else
633 error = EAFNOSUPPORT;
634 break;
635
636 default:
637 error = EINVAL;
638 break;
639 }
640
641 return error;
642}