if_gif.c revision 111888 
1/*	$FreeBSD: head/sys/net/if_gif.c 111888 2003-03-04 23:19:55Z jlemon $	*/
2/*	$KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $	*/
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 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#include "opt_inet.h"
34#include "opt_inet6.h"
35#include "opt_mac.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/kernel.h>
40#include <sys/mac.h>
41#include <sys/malloc.h>
42#include <sys/mbuf.h>
43#include <sys/socket.h>
44#include <sys/sockio.h>
45#include <sys/errno.h>
46#include <sys/time.h>
47#include <sys/sysctl.h>
48#include <sys/syslog.h>
49#include <sys/protosw.h>
50#include <sys/conf.h>
51#include <machine/cpu.h>
52
53#include <net/if.h>
54#include <net/if_types.h>
55#include <net/netisr.h>
56#include <net/route.h>
57#include <net/bpf.h>
58
59#include <netinet/in.h>
60#include <netinet/in_systm.h>
61#include <netinet/ip.h>
62#ifdef	INET
63#include <netinet/in_var.h>
64#include <netinet/in_gif.h>
65#include <netinet/ip_var.h>
66#endif	/* INET */
67
68#ifdef INET6
69#ifndef INET
70#include <netinet/in.h>
71#endif
72#include <netinet6/in6_var.h>
73#include <netinet/ip6.h>
74#include <netinet6/ip6_var.h>
75#include <netinet6/in6_gif.h>
76#include <netinet6/ip6protosw.h>
77#endif /* INET6 */
78
79#include <netinet/ip_encap.h>
80#include <net/if_gif.h>
81
82#include <net/net_osdep.h>
83
84#define GIFNAME		"gif"
85
86static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
87static LIST_HEAD(, gif_softc) gif_softc_list;
88
89void	(*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
90void	(*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
91void	(*ng_gif_attach_p)(struct ifnet *ifp);
92void	(*ng_gif_detach_p)(struct ifnet *ifp);
93
94int	gif_clone_create(struct if_clone *, int);
95void	gif_clone_destroy(struct ifnet *);
96
97struct if_clone gif_cloner = IF_CLONE_INITIALIZER("gif",
98    gif_clone_create, gif_clone_destroy, 0, IF_MAXUNIT);
99
100static int gifmodevent(module_t, int, void *);
101
102SYSCTL_DECL(_net_link);
103SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0,
104    "Generic Tunnel Interface");
105#ifndef MAX_GIF_NEST
106/*
107 * This macro controls the default upper limitation on nesting of gif tunnels.
108 * Since, setting a large value to this macro with a careless configuration
109 * may introduce system crash, we don't allow any nestings by default.
110 * If you need to configure nested gif tunnels, you can define this macro
111 * in your kernel configuration file.  However, if you do so, please be
112 * careful to configure the tunnels so that it won't make a loop.
113 */
114#define MAX_GIF_NEST 1
115#endif
116static int max_gif_nesting = MAX_GIF_NEST;
117SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_RW,
118    &max_gif_nesting, 0, "Max nested tunnels");
119
120/*
121 * By default, we disallow creation of multiple tunnels between the same
122 * pair of addresses.  Some applications require this functionality so
123 * we allow control over this check here.
124 */
125#ifdef XBONEHACK
126static int parallel_tunnels = 1;
127#else
128static int parallel_tunnels = 0;
129#endif
130SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels, CTLFLAG_RW,
131    &parallel_tunnels, 0, "Allow parallel tunnels?");
132
133int
134gif_clone_create(ifc, unit)
135	struct if_clone *ifc;
136	int unit;
137{
138	struct gif_softc *sc;
139
140	sc = malloc (sizeof(struct gif_softc), M_GIF, M_WAITOK);
141	bzero(sc, sizeof(struct gif_softc));
142
143	sc->gif_if.if_softc = sc;
144	sc->gif_if.if_name = GIFNAME;
145	sc->gif_if.if_unit = unit;
146
147	gifattach0(sc);
148
149	LIST_INSERT_HEAD(&gif_softc_list, sc, gif_list);
150	return (0);
151}
152
153void
154gifattach0(sc)
155	struct gif_softc *sc;
156{
157
158	sc->encap_cookie4 = sc->encap_cookie6 = NULL;
159
160	sc->gif_if.if_addrlen = 0;
161	sc->gif_if.if_mtu    = GIF_MTU;
162	sc->gif_if.if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
163#if 0
164	/* turn off ingress filter */
165	sc->gif_if.if_flags  |= IFF_LINK2;
166#endif
167	sc->gif_if.if_ioctl  = gif_ioctl;
168	sc->gif_if.if_output = gif_output;
169	sc->gif_if.if_type   = IFT_GIF;
170	sc->gif_if.if_snd.ifq_maxlen = IFQ_MAXLEN;
171	if_attach(&sc->gif_if);
172	bpfattach(&sc->gif_if, DLT_NULL, sizeof(u_int));
173	if (ng_gif_attach_p != NULL)
174		(*ng_gif_attach_p)(&sc->gif_if);
175}
176
177void
178gif_clone_destroy(ifp)
179	struct ifnet *ifp;
180{
181	int err;
182	struct gif_softc *sc = ifp->if_softc;
183
184	gif_delete_tunnel(&sc->gif_if);
185	LIST_REMOVE(sc, gif_list);
186#ifdef INET6
187	if (sc->encap_cookie6 != NULL) {
188		err = encap_detach(sc->encap_cookie6);
189		KASSERT(err == 0, ("Unexpected error detaching encap_cookie6"));
190	}
191#endif
192#ifdef INET
193	if (sc->encap_cookie4 != NULL) {
194		err = encap_detach(sc->encap_cookie4);
195		KASSERT(err == 0, ("Unexpected error detaching encap_cookie4"));
196	}
197#endif
198
199	if (ng_gif_detach_p != NULL)
200		(*ng_gif_detach_p)(ifp);
201	bpfdetach(ifp);
202	if_detach(ifp);
203
204	free(sc, M_GIF);
205}
206
207static int
208gifmodevent(mod, type, data)
209	module_t mod;
210	int type;
211	void *data;
212{
213
214	switch (type) {
215	case MOD_LOAD:
216		LIST_INIT(&gif_softc_list);
217		if_clone_attach(&gif_cloner);
218
219#ifdef INET6
220		ip6_gif_hlim = GIF_HLIM;
221#endif
222
223		break;
224	case MOD_UNLOAD:
225		if_clone_detach(&gif_cloner);
226
227		while (!LIST_EMPTY(&gif_softc_list))
228			gif_clone_destroy(&LIST_FIRST(&gif_softc_list)->gif_if);
229
230#ifdef INET6
231		ip6_gif_hlim = 0;
232#endif
233		break;
234	}
235	return 0;
236}
237
238static moduledata_t gif_mod = {
239	"if_gif",
240	gifmodevent,
241	0
242};
243
244DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
245MODULE_VERSION(if_gif, 1);
246
247int
248gif_encapcheck(m, off, proto, arg)
249	const struct mbuf *m;
250	int off;
251	int proto;
252	void *arg;
253{
254	struct ip ip;
255	struct gif_softc *sc;
256
257	sc = (struct gif_softc *)arg;
258	if (sc == NULL)
259		return 0;
260
261	if ((sc->gif_if.if_flags & IFF_UP) == 0)
262		return 0;
263
264	/* no physical address */
265	if (!sc->gif_psrc || !sc->gif_pdst)
266		return 0;
267
268	switch (proto) {
269#ifdef INET
270	case IPPROTO_IPV4:
271		break;
272#endif
273#ifdef INET6
274	case IPPROTO_IPV6:
275		break;
276#endif
277	default:
278		return 0;
279	}
280
281	/* Bail on short packets */
282	if (m->m_pkthdr.len < sizeof(ip))
283		return 0;
284
285	m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
286
287	switch (ip.ip_v) {
288#ifdef INET
289	case 4:
290		if (sc->gif_psrc->sa_family != AF_INET ||
291		    sc->gif_pdst->sa_family != AF_INET)
292			return 0;
293		return gif_encapcheck4(m, off, proto, arg);
294#endif
295#ifdef INET6
296	case 6:
297		if (m->m_pkthdr.len < sizeof(struct ip6_hdr))
298			return 0;
299		if (sc->gif_psrc->sa_family != AF_INET6 ||
300		    sc->gif_pdst->sa_family != AF_INET6)
301			return 0;
302		return gif_encapcheck6(m, off, proto, arg);
303#endif
304	default:
305		return 0;
306	}
307}
308
309int
310gif_output(ifp, m, dst, rt)
311	struct ifnet *ifp;
312	struct mbuf *m;
313	struct sockaddr *dst;
314	struct rtentry *rt;	/* added in net2 */
315{
316	struct gif_softc *sc = (struct gif_softc*)ifp;
317	int error = 0;
318	static int called = 0;	/* XXX: MUTEX */
319
320#ifdef MAC
321	error = mac_check_ifnet_transmit(ifp, m);
322	if (error) {
323		m_freem(m);
324		goto end;
325	}
326#endif
327
328	/*
329	 * gif may cause infinite recursion calls when misconfigured.
330	 * We'll prevent this by introducing upper limit.
331	 * XXX: this mechanism may introduce another problem about
332	 *      mutual exclusion of the variable CALLED, especially if we
333	 *      use kernel thread.
334	 */
335	if (++called > max_gif_nesting) {
336		log(LOG_NOTICE,
337		    "gif_output: recursively called too many times(%d)\n",
338		    called);
339		m_freem(m);
340		error = EIO;	/* is there better errno? */
341		goto end;
342	}
343
344	m->m_flags &= ~(M_BCAST|M_MCAST);
345	if (!(ifp->if_flags & IFF_UP) ||
346	    sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
347		m_freem(m);
348		error = ENETDOWN;
349		goto end;
350	}
351
352	if (ifp->if_bpf) {
353		/*
354		 * We need to prepend the address family as
355		 * a four byte field.  Cons up a dummy header
356		 * to pacify bpf.  This is safe because bpf
357		 * will only read from the mbuf (i.e., it won't
358		 * try to free it or keep a pointer a to it).
359		 */
360		struct mbuf m0;
361		u_int32_t af = dst->sa_family;
362
363		m0.m_next = m;
364		m0.m_len = 4;
365		m0.m_data = (char *)&af;
366
367		BPF_MTAP(ifp, &m0);
368	}
369	ifp->if_opackets++;
370	ifp->if_obytes += m->m_pkthdr.len;
371
372	/* inner AF-specific encapsulation */
373
374	/* XXX should we check if our outer source is legal? */
375
376	/* dispatch to output logic based on outer AF */
377	switch (sc->gif_psrc->sa_family) {
378#ifdef INET
379	case AF_INET:
380		error = in_gif_output(ifp, dst->sa_family, m);
381		break;
382#endif
383#ifdef INET6
384	case AF_INET6:
385		error = in6_gif_output(ifp, dst->sa_family, m);
386		break;
387#endif
388	default:
389		m_freem(m);
390		error = ENETDOWN;
391		goto end;
392	}
393
394  end:
395	called = 0;		/* reset recursion counter */
396	if (error)
397		ifp->if_oerrors++;
398	return error;
399}
400
401void
402gif_input(m, af, ifp)
403	struct mbuf *m;
404	int af;
405	struct ifnet *ifp;
406{
407	int isr;
408
409	if (ifp == NULL) {
410		/* just in case */
411		m_freem(m);
412		return;
413	}
414
415	m->m_pkthdr.rcvif = ifp;
416
417#ifdef MAC
418	mac_create_mbuf_from_ifnet(ifp, m);
419#endif
420
421	if (ifp->if_bpf) {
422		/*
423		 * We need to prepend the address family as
424		 * a four byte field.  Cons up a dummy header
425		 * to pacify bpf.  This is safe because bpf
426		 * will only read from the mbuf (i.e., it won't
427		 * try to free it or keep a pointer a to it).
428		 */
429		struct mbuf m0;
430		u_int32_t af1 = af;
431
432		m0.m_next = m;
433		m0.m_len = 4;
434		m0.m_data = (char *)&af1;
435
436		BPF_MTAP(ifp, &m0);
437	}
438
439	if (ng_gif_input_p != NULL) {
440		(*ng_gif_input_p)(ifp, &m, af);
441		if (m == NULL)
442			return;
443	}
444
445	/*
446	 * Put the packet to the network layer input queue according to the
447	 * specified address family.
448	 * Note: older versions of gif_input directly called network layer
449	 * input functions, e.g. ip6_input, here.  We changed the policy to
450	 * prevent too many recursive calls of such input functions, which
451	 * might cause kernel panic.  But the change may introduce another
452	 * problem; if the input queue is full, packets are discarded.
453	 * The kernel stack overflow really happened, and we believed
454	 * queue-full rarely occurs, so we changed the policy.
455	 */
456	switch (af) {
457#ifdef INET
458	case AF_INET:
459		isr = NETISR_IP;
460		break;
461#endif
462#ifdef INET6
463	case AF_INET6:
464		isr = NETISR_IPV6;
465		break;
466#endif
467	default:
468		if (ng_gif_input_orphan_p != NULL)
469			(*ng_gif_input_orphan_p)(ifp, m, af);
470		else
471			m_freem(m);
472		return;
473	}
474
475	ifp->if_ipackets++;
476	ifp->if_ibytes += m->m_pkthdr.len;
477	netisr_dispatch(isr, m);
478}
479
480/* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
481int
482gif_ioctl(ifp, cmd, data)
483	struct ifnet *ifp;
484	u_long cmd;
485	caddr_t data;
486{
487	struct gif_softc *sc  = (struct gif_softc*)ifp;
488	struct ifreq     *ifr = (struct ifreq*)data;
489	int error = 0, size;
490	struct sockaddr *dst, *src;
491#ifdef	SIOCSIFMTU /* xxx */
492	u_long mtu;
493#endif
494
495	switch (cmd) {
496	case SIOCSIFADDR:
497		ifp->if_flags |= IFF_UP;
498		break;
499
500	case SIOCSIFDSTADDR:
501		break;
502
503	case SIOCADDMULTI:
504	case SIOCDELMULTI:
505		break;
506
507#ifdef	SIOCSIFMTU /* xxx */
508	case SIOCGIFMTU:
509		break;
510
511	case SIOCSIFMTU:
512		mtu = ifr->ifr_mtu;
513		if (mtu < GIF_MTU_MIN || mtu > GIF_MTU_MAX)
514			return (EINVAL);
515		ifp->if_mtu = mtu;
516		break;
517#endif /* SIOCSIFMTU */
518
519#ifdef INET
520	case SIOCSIFPHYADDR:
521#endif
522#ifdef INET6
523	case SIOCSIFPHYADDR_IN6:
524#endif /* INET6 */
525	case SIOCSLIFPHYADDR:
526		switch (cmd) {
527#ifdef INET
528		case SIOCSIFPHYADDR:
529			src = (struct sockaddr *)
530				&(((struct in_aliasreq *)data)->ifra_addr);
531			dst = (struct sockaddr *)
532				&(((struct in_aliasreq *)data)->ifra_dstaddr);
533			break;
534#endif
535#ifdef INET6
536		case SIOCSIFPHYADDR_IN6:
537			src = (struct sockaddr *)
538				&(((struct in6_aliasreq *)data)->ifra_addr);
539			dst = (struct sockaddr *)
540				&(((struct in6_aliasreq *)data)->ifra_dstaddr);
541			break;
542#endif
543		case SIOCSLIFPHYADDR:
544			src = (struct sockaddr *)
545				&(((struct if_laddrreq *)data)->addr);
546			dst = (struct sockaddr *)
547				&(((struct if_laddrreq *)data)->dstaddr);
548			break;
549		default:
550			return EINVAL;
551		}
552
553		/* sa_family must be equal */
554		if (src->sa_family != dst->sa_family)
555			return EINVAL;
556
557		/* validate sa_len */
558		switch (src->sa_family) {
559#ifdef INET
560		case AF_INET:
561			if (src->sa_len != sizeof(struct sockaddr_in))
562				return EINVAL;
563			break;
564#endif
565#ifdef INET6
566		case AF_INET6:
567			if (src->sa_len != sizeof(struct sockaddr_in6))
568				return EINVAL;
569			break;
570#endif
571		default:
572			return EAFNOSUPPORT;
573		}
574		switch (dst->sa_family) {
575#ifdef INET
576		case AF_INET:
577			if (dst->sa_len != sizeof(struct sockaddr_in))
578				return EINVAL;
579			break;
580#endif
581#ifdef INET6
582		case AF_INET6:
583			if (dst->sa_len != sizeof(struct sockaddr_in6))
584				return EINVAL;
585			break;
586#endif
587		default:
588			return EAFNOSUPPORT;
589		}
590
591		/* check sa_family looks sane for the cmd */
592		switch (cmd) {
593		case SIOCSIFPHYADDR:
594			if (src->sa_family == AF_INET)
595				break;
596			return EAFNOSUPPORT;
597#ifdef INET6
598		case SIOCSIFPHYADDR_IN6:
599			if (src->sa_family == AF_INET6)
600				break;
601			return EAFNOSUPPORT;
602#endif /* INET6 */
603		case SIOCSLIFPHYADDR:
604			/* checks done in the above */
605			break;
606		}
607
608		error = gif_set_tunnel(&sc->gif_if, src, dst);
609		break;
610
611#ifdef SIOCDIFPHYADDR
612	case SIOCDIFPHYADDR:
613		gif_delete_tunnel(&sc->gif_if);
614		break;
615#endif
616
617	case SIOCGIFPSRCADDR:
618#ifdef INET6
619	case SIOCGIFPSRCADDR_IN6:
620#endif /* INET6 */
621		if (sc->gif_psrc == NULL) {
622			error = EADDRNOTAVAIL;
623			goto bad;
624		}
625		src = sc->gif_psrc;
626		switch (cmd) {
627#ifdef INET
628		case SIOCGIFPSRCADDR:
629			dst = &ifr->ifr_addr;
630			size = sizeof(ifr->ifr_addr);
631			break;
632#endif /* INET */
633#ifdef INET6
634		case SIOCGIFPSRCADDR_IN6:
635			dst = (struct sockaddr *)
636				&(((struct in6_ifreq *)data)->ifr_addr);
637			size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
638			break;
639#endif /* INET6 */
640		default:
641			error = EADDRNOTAVAIL;
642			goto bad;
643		}
644		if (src->sa_len > size)
645			return EINVAL;
646		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
647		break;
648
649	case SIOCGIFPDSTADDR:
650#ifdef INET6
651	case SIOCGIFPDSTADDR_IN6:
652#endif /* INET6 */
653		if (sc->gif_pdst == NULL) {
654			error = EADDRNOTAVAIL;
655			goto bad;
656		}
657		src = sc->gif_pdst;
658		switch (cmd) {
659#ifdef INET
660		case SIOCGIFPDSTADDR:
661			dst = &ifr->ifr_addr;
662			size = sizeof(ifr->ifr_addr);
663			break;
664#endif /* INET */
665#ifdef INET6
666		case SIOCGIFPDSTADDR_IN6:
667			dst = (struct sockaddr *)
668				&(((struct in6_ifreq *)data)->ifr_addr);
669			size = sizeof(((struct in6_ifreq *)data)->ifr_addr);
670			break;
671#endif /* INET6 */
672		default:
673			error = EADDRNOTAVAIL;
674			goto bad;
675		}
676		if (src->sa_len > size)
677			return EINVAL;
678		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
679		break;
680
681	case SIOCGLIFPHYADDR:
682		if (sc->gif_psrc == NULL || sc->gif_pdst == NULL) {
683			error = EADDRNOTAVAIL;
684			goto bad;
685		}
686
687		/* copy src */
688		src = sc->gif_psrc;
689		dst = (struct sockaddr *)
690			&(((struct if_laddrreq *)data)->addr);
691		size = sizeof(((struct if_laddrreq *)data)->addr);
692		if (src->sa_len > size)
693			return EINVAL;
694		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
695
696		/* copy dst */
697		src = sc->gif_pdst;
698		dst = (struct sockaddr *)
699			&(((struct if_laddrreq *)data)->dstaddr);
700		size = sizeof(((struct if_laddrreq *)data)->dstaddr);
701		if (src->sa_len > size)
702			return EINVAL;
703		bcopy((caddr_t)src, (caddr_t)dst, src->sa_len);
704		break;
705
706	case SIOCSIFFLAGS:
707		/* if_ioctl() takes care of it */
708		break;
709
710	default:
711		error = EINVAL;
712		break;
713	}
714 bad:
715	return error;
716}
717
718int
719gif_set_tunnel(ifp, src, dst)
720	struct ifnet *ifp;
721	struct sockaddr *src;
722	struct sockaddr *dst;
723{
724	struct gif_softc *sc = (struct gif_softc *)ifp;
725	struct gif_softc *sc2;
726	struct sockaddr *osrc, *odst, *sa;
727	int s;
728	int error = 0;
729
730	s = splnet();
731
732	LIST_FOREACH(sc2, &gif_softc_list, gif_list) {
733		if (sc2 == sc)
734			continue;
735		if (!sc2->gif_pdst || !sc2->gif_psrc)
736			continue;
737		if (sc2->gif_pdst->sa_family != dst->sa_family ||
738		    sc2->gif_pdst->sa_len != dst->sa_len ||
739		    sc2->gif_psrc->sa_family != src->sa_family ||
740		    sc2->gif_psrc->sa_len != src->sa_len)
741			continue;
742
743		/*
744		 * Disallow parallel tunnels unless instructed
745		 * otherwise.
746		 */
747		if (!parallel_tunnels &&
748		    bcmp(sc2->gif_pdst, dst, dst->sa_len) == 0 &&
749		    bcmp(sc2->gif_psrc, src, src->sa_len) == 0) {
750			error = EADDRNOTAVAIL;
751			goto bad;
752		}
753
754		/* XXX both end must be valid? (I mean, not 0.0.0.0) */
755	}
756
757	/* XXX we can detach from both, but be polite just in case */
758	if (sc->gif_psrc)
759		switch (sc->gif_psrc->sa_family) {
760#ifdef INET
761		case AF_INET:
762			(void)in_gif_detach(sc);
763			break;
764#endif
765#ifdef INET6
766		case AF_INET6:
767			(void)in6_gif_detach(sc);
768			break;
769#endif
770		}
771
772	osrc = sc->gif_psrc;
773	sa = (struct sockaddr *)malloc(src->sa_len, M_IFADDR, M_WAITOK);
774	bcopy((caddr_t)src, (caddr_t)sa, src->sa_len);
775	sc->gif_psrc = sa;
776
777	odst = sc->gif_pdst;
778	sa = (struct sockaddr *)malloc(dst->sa_len, M_IFADDR, M_WAITOK);
779	bcopy((caddr_t)dst, (caddr_t)sa, dst->sa_len);
780	sc->gif_pdst = sa;
781
782	switch (sc->gif_psrc->sa_family) {
783#ifdef INET
784	case AF_INET:
785		error = in_gif_attach(sc);
786		break;
787#endif
788#ifdef INET6
789	case AF_INET6:
790		error = in6_gif_attach(sc);
791		break;
792#endif
793	}
794	if (error) {
795		/* rollback */
796		free((caddr_t)sc->gif_psrc, M_IFADDR);
797		free((caddr_t)sc->gif_pdst, M_IFADDR);
798		sc->gif_psrc = osrc;
799		sc->gif_pdst = odst;
800		goto bad;
801	}
802
803	if (osrc)
804		free((caddr_t)osrc, M_IFADDR);
805	if (odst)
806		free((caddr_t)odst, M_IFADDR);
807
808	if (sc->gif_psrc && sc->gif_pdst)
809		ifp->if_flags |= IFF_RUNNING;
810	else
811		ifp->if_flags &= ~IFF_RUNNING;
812	splx(s);
813
814	return 0;
815
816 bad:
817	if (sc->gif_psrc && sc->gif_pdst)
818		ifp->if_flags |= IFF_RUNNING;
819	else
820		ifp->if_flags &= ~IFF_RUNNING;
821	splx(s);
822
823	return error;
824}
825
826void
827gif_delete_tunnel(ifp)
828	struct ifnet *ifp;
829{
830	struct gif_softc *sc = (struct gif_softc *)ifp;
831	int s;
832
833	s = splnet();
834
835	if (sc->gif_psrc) {
836		free((caddr_t)sc->gif_psrc, M_IFADDR);
837		sc->gif_psrc = NULL;
838	}
839	if (sc->gif_pdst) {
840		free((caddr_t)sc->gif_pdst, M_IFADDR);
841		sc->gif_pdst = NULL;
842	}
843	/* it is safe to detach from both */
844#ifdef INET
845	(void)in_gif_detach(sc);
846#endif
847#ifdef INET6
848	(void)in6_gif_detach(sc);
849#endif
850
851	if (sc->gif_psrc && sc->gif_pdst)
852		ifp->if_flags |= IFF_RUNNING;
853	else
854		ifp->if_flags &= ~IFF_RUNNING;
855	splx(s);
856}
857