FreeBSD/Linux Kernel Cross Reference
sys/net/if_stf.c
1 /* $FreeBSD: releng/5.0/sys/net/if_stf.c 109328 2003-01-15 20:25:08Z suz $ */
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 #include "opt_mac.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/mac.h>
86 #include <sys/mbuf.h>
87 #include <sys/errno.h>
88 #include <sys/kernel.h>
89 #include <sys/protosw.h>
90 #include <sys/queue.h>
91 #include <machine/cpu.h>
92
93 #include <sys/malloc.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_var.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 STFNAME "stf"
121
122 #define IN6_IS_ADDR_6TO4(x) (ntohs((x)->s6_addr16[0]) == 0x2002)
123
124 /*
125 * XXX: Return a pointer with 16-bit aligned. Don't cast it to
126 * struct in_addr *; use bcopy() instead.
127 */
128 #define GET_V4(x) ((caddr_t)(&(x)->s6_addr16[1]))
129
130 struct stf_softc {
131 struct ifnet sc_if; /* common area */
132 union {
133 struct route __sc_ro4;
134 struct route_in6 __sc_ro6; /* just for safety */
135 } __sc_ro46;
136 #define sc_ro __sc_ro46.__sc_ro4
137 const struct encaptab *encap_cookie;
138 LIST_ENTRY(stf_softc) sc_list; /* all stf's are linked */
139 };
140
141 static LIST_HEAD(, stf_softc) stf_softc_list;
142
143 static MALLOC_DEFINE(M_STF, STFNAME, "6to4 Tunnel Interface");
144 static int ip_stf_ttl = 40;
145
146 extern struct domain inetdomain;
147 struct protosw in_stf_protosw =
148 { SOCK_RAW, &inetdomain, IPPROTO_IPV6, PR_ATOMIC|PR_ADDR,
149 in_stf_input, (pr_output_t*)rip_output, 0, rip_ctloutput,
150 0,
151 0, 0, 0, 0,
152 &rip_usrreqs
153 };
154
155 static int stfmodevent(module_t, int, void *);
156 static int stf_encapcheck(const struct mbuf *, int, int, void *);
157 static struct in6_ifaddr *stf_getsrcifa6(struct ifnet *);
158 static int stf_output(struct ifnet *, struct mbuf *, struct sockaddr *,
159 struct rtentry *);
160 static int isrfc1918addr(struct in_addr *);
161 static int stf_checkaddr4(struct stf_softc *, struct in_addr *,
162 struct ifnet *);
163 static int stf_checkaddr6(struct stf_softc *, struct in6_addr *,
164 struct ifnet *);
165 static void stf_rtrequest(int, struct rtentry *, struct rt_addrinfo *);
166 static int stf_ioctl(struct ifnet *, u_long, caddr_t);
167
168 int stf_clone_create(struct if_clone *, int);
169 void stf_clone_destroy(struct ifnet *);
170
171 /* only one clone is currently allowed */
172 struct if_clone stf_cloner =
173 IF_CLONE_INITIALIZER(STFNAME, stf_clone_create, stf_clone_destroy, 0, 0);
174
175 int
176 stf_clone_create(ifc, unit)
177 struct if_clone *ifc;
178 int unit;
179 {
180 struct stf_softc *sc;
181
182 sc = malloc(sizeof(struct stf_softc), M_STF, M_WAITOK | M_ZERO);
183 sc->sc_if.if_name = STFNAME;
184 sc->sc_if.if_unit = unit;
185
186 sc->encap_cookie = encap_attach_func(AF_INET, IPPROTO_IPV6,
187 stf_encapcheck, &in_stf_protosw, sc);
188 if (sc->encap_cookie == NULL) {
189 printf("%s: attach failed\n", if_name(&sc->sc_if));
190 free(sc, M_STF);
191 return (ENOMEM);
192 }
193
194 sc->sc_if.if_mtu = IPV6_MMTU;
195 sc->sc_if.if_ioctl = stf_ioctl;
196 sc->sc_if.if_output = stf_output;
197 sc->sc_if.if_type = IFT_STF;
198 sc->sc_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
199 if_attach(&sc->sc_if);
200 bpfattach(&sc->sc_if, DLT_NULL, sizeof(u_int));
201 LIST_INSERT_HEAD(&stf_softc_list, sc, sc_list);
202 return (0);
203 }
204
205 void
206 stf_clone_destroy(ifp)
207 struct ifnet *ifp;
208 {
209 int err;
210 struct stf_softc *sc = (void *) ifp;
211
212 LIST_REMOVE(sc, sc_list);
213 err = encap_detach(sc->encap_cookie);
214 KASSERT(err == 0, ("Unexpected error detaching encap_cookie"));
215 bpfdetach(ifp);
216 if_detach(ifp);
217
218 free(sc, M_STF);
219 }
220
221 static int
222 stfmodevent(mod, type, data)
223 module_t mod;
224 int type;
225 void *data;
226 {
227
228 switch (type) {
229 case MOD_LOAD:
230 LIST_INIT(&stf_softc_list);
231 if_clone_attach(&stf_cloner);
232
233 break;
234 case MOD_UNLOAD:
235 if_clone_detach(&stf_cloner);
236
237 while (!LIST_EMPTY(&stf_softc_list))
238 stf_clone_destroy(&LIST_FIRST(&stf_softc_list)->sc_if);
239 break;
240 }
241
242 return (0);
243 }
244
245 static moduledata_t stf_mod = {
246 "if_stf",
247 stfmodevent,
248 0
249 };
250
251 DECLARE_MODULE(if_stf, stf_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
252
253 static int
254 stf_encapcheck(m, off, proto, arg)
255 const struct mbuf *m;
256 int off;
257 int proto;
258 void *arg;
259 {
260 struct ip ip;
261 struct in6_ifaddr *ia6;
262 struct stf_softc *sc;
263 struct in_addr a, b, mask;
264
265 sc = (struct stf_softc *)arg;
266 if (sc == NULL)
267 return 0;
268
269 if ((sc->sc_if.if_flags & IFF_UP) == 0)
270 return 0;
271
272 /* IFF_LINK0 means "no decapsulation" */
273 if ((sc->sc_if.if_flags & IFF_LINK0) != 0)
274 return 0;
275
276 if (proto != IPPROTO_IPV6)
277 return 0;
278
279 /* LINTED const cast */
280 m_copydata((struct mbuf *)(uintptr_t)m, 0, sizeof(ip), (caddr_t)&ip);
281
282 if (ip.ip_v != 4)
283 return 0;
284
285 ia6 = stf_getsrcifa6(&sc->sc_if);
286 if (ia6 == NULL)
287 return 0;
288
289 /*
290 * check if IPv4 dst matches the IPv4 address derived from the
291 * local 6to4 address.
292 * success on: dst = 10.1.1.1, ia6->ia_addr = 2002:0a01:0101:...
293 */
294 if (bcmp(GET_V4(&ia6->ia_addr.sin6_addr), &ip.ip_dst,
295 sizeof(ip.ip_dst)) != 0)
296 return 0;
297
298 /*
299 * check if IPv4 src matches the IPv4 address derived from the
300 * local 6to4 address masked by prefixmask.
301 * success on: src = 10.1.1.1, ia6->ia_addr = 2002:0a00:.../24
302 * fail on: src = 10.1.1.1, ia6->ia_addr = 2002:0b00:.../24
303 */
304 bzero(&a, sizeof(a));
305 bcopy(GET_V4(&ia6->ia_addr.sin6_addr), &a, sizeof(a));
306 bcopy(GET_V4(&ia6->ia_prefixmask.sin6_addr), &mask, sizeof(mask));
307 a.s_addr &= mask.s_addr;
308 b = ip.ip_src;
309 b.s_addr &= mask.s_addr;
310 if (a.s_addr != b.s_addr)
311 return 0;
312
313 /* stf interface makes single side match only */
314 return 32;
315 }
316
317 static struct in6_ifaddr *
318 stf_getsrcifa6(ifp)
319 struct ifnet *ifp;
320 {
321 struct ifaddr *ia;
322 struct in_ifaddr *ia4;
323 struct sockaddr_in6 *sin6;
324 struct in_addr in;
325
326 for (ia = TAILQ_FIRST(&ifp->if_addrlist);
327 ia;
328 ia = TAILQ_NEXT(ia, ifa_list))
329 {
330 if (ia->ifa_addr == NULL)
331 continue;
332 if (ia->ifa_addr->sa_family != AF_INET6)
333 continue;
334 sin6 = (struct sockaddr_in6 *)ia->ifa_addr;
335 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr))
336 continue;
337
338 bcopy(GET_V4(&sin6->sin6_addr), &in, sizeof(in));
339 LIST_FOREACH(ia4, INADDR_HASH(in.s_addr), ia_hash)
340 if (ia4->ia_addr.sin_addr.s_addr == in.s_addr)
341 break;
342 if (ia4 == NULL)
343 continue;
344
345 return (struct in6_ifaddr *)ia;
346 }
347
348 return NULL;
349 }
350
351 static int
352 stf_output(ifp, m, dst, rt)
353 struct ifnet *ifp;
354 struct mbuf *m;
355 struct sockaddr *dst;
356 struct rtentry *rt;
357 {
358 struct stf_softc *sc;
359 struct sockaddr_in6 *dst6;
360 struct in_addr in4;
361 caddr_t ptr;
362 struct sockaddr_in *dst4;
363 u_int8_t tos;
364 struct ip *ip;
365 struct ip6_hdr *ip6;
366 struct in6_ifaddr *ia6;
367 #ifdef MAC
368 int error;
369
370 error = mac_check_ifnet_transmit(ifp, m);
371 if (error) {
372 m_freem(m);
373 return (error);
374 }
375 #endif
376
377 sc = (struct stf_softc*)ifp;
378 dst6 = (struct sockaddr_in6 *)dst;
379
380 /* just in case */
381 if ((ifp->if_flags & IFF_UP) == 0) {
382 m_freem(m);
383 ifp->if_oerrors++;
384 return ENETDOWN;
385 }
386
387 /*
388 * If we don't have an ip4 address that match my inner ip6 address,
389 * we shouldn't generate output. Without this check, we'll end up
390 * using wrong IPv4 source.
391 */
392 ia6 = stf_getsrcifa6(ifp);
393 if (ia6 == NULL) {
394 m_freem(m);
395 ifp->if_oerrors++;
396 return ENETDOWN;
397 }
398
399 if (m->m_len < sizeof(*ip6)) {
400 m = m_pullup(m, sizeof(*ip6));
401 if (!m) {
402 ifp->if_oerrors++;
403 return ENOBUFS;
404 }
405 }
406 ip6 = mtod(m, struct ip6_hdr *);
407 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
408
409 /*
410 * Pickup the right outer dst addr from the list of candidates.
411 * ip6_dst has priority as it may be able to give us shorter IPv4 hops.
412 */
413 ptr = NULL;
414 if (IN6_IS_ADDR_6TO4(&ip6->ip6_dst))
415 ptr = GET_V4(&ip6->ip6_dst);
416 else if (IN6_IS_ADDR_6TO4(&dst6->sin6_addr))
417 ptr = GET_V4(&dst6->sin6_addr);
418 else {
419 m_freem(m);
420 ifp->if_oerrors++;
421 return ENETUNREACH;
422 }
423 bcopy(ptr, &in4, sizeof(in4));
424
425 #if NBPFILTER > 0
426 if (ifp->if_bpf) {
427 /*
428 * We need to prepend the address family as
429 * a four byte field. Cons up a dummy header
430 * to pacify bpf. This is safe because bpf
431 * will only read from the mbuf (i.e., it won't
432 * try to free it or keep a pointer a to it).
433 */
434 struct mbuf m0;
435 u_int32_t af = AF_INET6;
436
437 m0.m_next = m;
438 m0.m_len = 4;
439 m0.m_data = (char *)⁡
440
441 #ifdef HAVE_OLD_BPF
442 BPF_MTAP(ifp, &m0);
443 #else
444 bpf_mtap(ifp->if_bpf, &m0);
445 #endif
446 }
447 #endif /*NBPFILTER > 0*/
448
449 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
450 if (m && m->m_len < sizeof(struct ip))
451 m = m_pullup(m, sizeof(struct ip));
452 if (m == NULL) {
453 ifp->if_oerrors++;
454 return ENOBUFS;
455 }
456 ip = mtod(m, struct ip *);
457
458 bzero(ip, sizeof(*ip));
459
460 bcopy(GET_V4(&((struct sockaddr_in6 *)&ia6->ia_addr)->sin6_addr),
461 &ip->ip_src, sizeof(ip->ip_src));
462 bcopy(&in4, &ip->ip_dst, sizeof(ip->ip_dst));
463 ip->ip_p = IPPROTO_IPV6;
464 ip->ip_ttl = ip_stf_ttl;
465 ip->ip_len = m->m_pkthdr.len; /*host order*/
466 if (ifp->if_flags & IFF_LINK1)
467 ip_ecn_ingress(ECN_ALLOWED, &ip->ip_tos, &tos);
468 else
469 ip_ecn_ingress(ECN_NOCARE, &ip->ip_tos, &tos);
470
471 dst4 = (struct sockaddr_in *)&sc->sc_ro.ro_dst;
472 if (dst4->sin_family != AF_INET ||
473 bcmp(&dst4->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)) != 0) {
474 /* cache route doesn't match */
475 dst4->sin_family = AF_INET;
476 dst4->sin_len = sizeof(struct sockaddr_in);
477 bcopy(&ip->ip_dst, &dst4->sin_addr, sizeof(dst4->sin_addr));
478 if (sc->sc_ro.ro_rt) {
479 RTFREE(sc->sc_ro.ro_rt);
480 sc->sc_ro.ro_rt = NULL;
481 }
482 }
483
484 if (sc->sc_ro.ro_rt == NULL) {
485 rtalloc(&sc->sc_ro);
486 if (sc->sc_ro.ro_rt == NULL) {
487 m_freem(m);
488 ifp->if_oerrors++;
489 return ENETUNREACH;
490 }
491 }
492
493 ifp->if_opackets++;
494 return ip_output(m, NULL, &sc->sc_ro, 0, NULL, NULL);
495 }
496
497 static int
498 isrfc1918addr(in)
499 struct in_addr *in;
500 {
501 /*
502 * returns 1 if private address range:
503 * 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16
504 */
505 if ((ntohl(in->s_addr) & 0xff000000) >> 24 == 10 ||
506 (ntohl(in->s_addr) & 0xfff00000) >> 16 == 172 * 256 + 16 ||
507 (ntohl(in->s_addr) & 0xffff0000) >> 16 == 192 * 256 + 168)
508 return 1;
509
510 return 0;
511 }
512
513 static int
514 stf_checkaddr4(sc, in, inifp)
515 struct stf_softc *sc;
516 struct in_addr *in;
517 struct ifnet *inifp; /* incoming interface */
518 {
519 struct in_ifaddr *ia4;
520
521 /*
522 * reject packets with the following address:
523 * 224.0.0.0/4 0.0.0.0/8 127.0.0.0/8 255.0.0.0/8
524 */
525 if (IN_MULTICAST(ntohl(in->s_addr)))
526 return -1;
527 switch ((ntohl(in->s_addr) & 0xff000000) >> 24) {
528 case 0: case 127: case 255:
529 return -1;
530 }
531
532 /*
533 * reject packets with private address range.
534 * (requirement from RFC3056 section 2 1st paragraph)
535 */
536 if (isrfc1918addr(in))
537 return -1;
538
539 /*
540 * reject packets with broadcast
541 */
542 for (ia4 = TAILQ_FIRST(&in_ifaddrhead);
543 ia4;
544 ia4 = TAILQ_NEXT(ia4, ia_link))
545 {
546 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
547 continue;
548 if (in->s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
549 return -1;
550 }
551
552 /*
553 * perform ingress filter
554 */
555 if (sc && (sc->sc_if.if_flags & IFF_LINK2) == 0 && inifp) {
556 struct sockaddr_in sin;
557 struct rtentry *rt;
558
559 bzero(&sin, sizeof(sin));
560 sin.sin_family = AF_INET;
561 sin.sin_len = sizeof(struct sockaddr_in);
562 sin.sin_addr = *in;
563 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
564 if (!rt || rt->rt_ifp != inifp) {
565 #if 0
566 log(LOG_WARNING, "%s: packet from 0x%x dropped "
567 "due to ingress filter\n", if_name(&sc->sc_if),
568 (u_int32_t)ntohl(sin.sin_addr.s_addr));
569 #endif
570 if (rt)
571 rtfree(rt);
572 return -1;
573 }
574 rtfree(rt);
575 }
576
577 return 0;
578 }
579
580 static int
581 stf_checkaddr6(sc, in6, inifp)
582 struct stf_softc *sc;
583 struct in6_addr *in6;
584 struct ifnet *inifp; /* incoming interface */
585 {
586 /*
587 * check 6to4 addresses
588 */
589 if (IN6_IS_ADDR_6TO4(in6)) {
590 struct in_addr in4;
591 bcopy(GET_V4(in6), &in4, sizeof(in4));
592 return stf_checkaddr4(sc, &in4, inifp);
593 }
594
595 /*
596 * reject anything that look suspicious. the test is implemented
597 * in ip6_input too, but we check here as well to
598 * (1) reject bad packets earlier, and
599 * (2) to be safe against future ip6_input change.
600 */
601 if (IN6_IS_ADDR_V4COMPAT(in6) || IN6_IS_ADDR_V4MAPPED(in6))
602 return -1;
603
604 return 0;
605 }
606
607 void
608 in_stf_input(m, off)
609 struct mbuf *m;
610 int off;
611 {
612 int proto;
613 struct stf_softc *sc;
614 struct ip *ip;
615 struct ip6_hdr *ip6;
616 u_int8_t otos, itos;
617 int len, isr;
618 struct ifqueue *ifq = NULL;
619 struct ifnet *ifp;
620
621 proto = mtod(m, struct ip *)->ip_p;
622
623 if (proto != IPPROTO_IPV6) {
624 m_freem(m);
625 return;
626 }
627
628 ip = mtod(m, struct ip *);
629
630 sc = (struct stf_softc *)encap_getarg(m);
631
632 if (sc == NULL || (sc->sc_if.if_flags & IFF_UP) == 0) {
633 m_freem(m);
634 return;
635 }
636
637 ifp = &sc->sc_if;
638
639 #ifdef MAC
640 mac_create_mbuf_from_ifnet(ifp, m);
641 #endif
642
643 /*
644 * perform sanity check against outer src/dst.
645 * for source, perform ingress filter as well.
646 */
647 if (stf_checkaddr4(sc, &ip->ip_dst, NULL) < 0 ||
648 stf_checkaddr4(sc, &ip->ip_src, m->m_pkthdr.rcvif) < 0) {
649 m_freem(m);
650 return;
651 }
652
653 otos = ip->ip_tos;
654 m_adj(m, off);
655
656 if (m->m_len < sizeof(*ip6)) {
657 m = m_pullup(m, sizeof(*ip6));
658 if (!m)
659 return;
660 }
661 ip6 = mtod(m, struct ip6_hdr *);
662
663 /*
664 * perform sanity check against inner src/dst.
665 * for source, perform ingress filter as well.
666 */
667 if (stf_checkaddr6(sc, &ip6->ip6_dst, NULL) < 0 ||
668 stf_checkaddr6(sc, &ip6->ip6_src, m->m_pkthdr.rcvif) < 0) {
669 m_freem(m);
670 return;
671 }
672
673 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
674 if ((ifp->if_flags & IFF_LINK1) != 0)
675 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
676 else
677 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
678 ip6->ip6_flow &= ~htonl(0xff << 20);
679 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
680
681 m->m_pkthdr.rcvif = ifp;
682
683 if (ifp->if_bpf) {
684 /*
685 * We need to prepend the address family as
686 * a four byte field. Cons up a dummy header
687 * to pacify bpf. This is safe because bpf
688 * will only read from the mbuf (i.e., it won't
689 * try to free it or keep a pointer a to it).
690 */
691 struct mbuf m0;
692 u_int32_t af = AF_INET6;
693
694 m0.m_next = m;
695 m0.m_len = 4;
696 m0.m_data = (char *)⁡
697
698 #ifdef HAVE_OLD_BPF
699 BPF_MTAP(ifp, &m0);
700 #else
701 bpf_mtap(ifp->if_bpf, &m0);
702 #endif
703 }
704
705 /*
706 * Put the packet to the network layer input queue according to the
707 * specified address family.
708 * See net/if_gif.c for possible issues with packet processing
709 * reorder due to extra queueing.
710 */
711 ifq = &ip6intrq;
712 isr = NETISR_IPV6;
713
714 len = m->m_pkthdr.len;
715 if (! IF_HANDOFF(ifq, m, NULL))
716 return;
717 schednetisr(isr);
718 ifp->if_ipackets++;
719 ifp->if_ibytes += len;
720 }
721
722 /* ARGSUSED */
723 static void
724 stf_rtrequest(cmd, rt, info)
725 int cmd;
726 struct rtentry *rt;
727 struct rt_addrinfo *info;
728 {
729
730 if (rt)
731 rt->rt_rmx.rmx_mtu = IPV6_MMTU;
732 }
733
734 static int
735 stf_ioctl(ifp, cmd, data)
736 struct ifnet *ifp;
737 u_long cmd;
738 caddr_t data;
739 {
740 struct ifaddr *ifa;
741 struct ifreq *ifr;
742 struct sockaddr_in6 *sin6;
743 struct in_addr addr;
744 int error;
745
746 error = 0;
747 switch (cmd) {
748 case SIOCSIFADDR:
749 ifa = (struct ifaddr *)data;
750 if (ifa == NULL || ifa->ifa_addr->sa_family != AF_INET6) {
751 error = EAFNOSUPPORT;
752 break;
753 }
754 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
755 if (!IN6_IS_ADDR_6TO4(&sin6->sin6_addr)) {
756 error = EINVAL;
757 break;
758 }
759 bcopy(GET_V4(&sin6->sin6_addr), &addr, sizeof(addr));
760 if (isrfc1918addr(&addr)) {
761 error = EINVAL;
762 break;
763 }
764
765 ifa->ifa_rtrequest = stf_rtrequest;
766 ifp->if_flags |= IFF_UP;
767 break;
768
769 case SIOCADDMULTI:
770 case SIOCDELMULTI:
771 ifr = (struct ifreq *)data;
772 if (ifr && ifr->ifr_addr.sa_family == AF_INET6)
773 ;
774 else
775 error = EAFNOSUPPORT;
776 break;
777
778 default:
779 error = EINVAL;
780 break;
781 }
782
783 return error;
784 }
Cache object: 82a53594ea4314eb191a490fe600c2c1
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