xref: /freebsd/sys/net/if_gif.c (revision 3332f1b444d4a73238e9f59cca27bfc95fe936bd)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5  * Copyright (c) 2018 Andrey V. Elsukov <ae@FreeBSD.org>
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  *	$KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $
33  */
34 
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37 
38 #include "opt_inet.h"
39 #include "opt_inet6.h"
40 
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/lock.h>
45 #include <sys/malloc.h>
46 #include <sys/mbuf.h>
47 #include <sys/module.h>
48 #include <sys/rmlock.h>
49 #include <sys/socket.h>
50 #include <sys/sockio.h>
51 #include <sys/sx.h>
52 #include <sys/errno.h>
53 #include <sys/time.h>
54 #include <sys/sysctl.h>
55 #include <sys/syslog.h>
56 #include <sys/priv.h>
57 #include <sys/proc.h>
58 #include <sys/conf.h>
59 #include <machine/cpu.h>
60 
61 #include <net/if.h>
62 #include <net/if_var.h>
63 #include <net/if_clone.h>
64 #include <net/if_types.h>
65 #include <net/netisr.h>
66 #include <net/route.h>
67 #include <net/bpf.h>
68 #include <net/vnet.h>
69 
70 #include <netinet/in.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/ip.h>
73 #include <netinet/ip_ecn.h>
74 #ifdef	INET
75 #include <netinet/in_var.h>
76 #include <netinet/ip_var.h>
77 #endif	/* INET */
78 
79 #ifdef INET6
80 #ifndef INET
81 #include <netinet/in.h>
82 #endif
83 #include <netinet6/in6_var.h>
84 #include <netinet/ip6.h>
85 #include <netinet6/ip6_ecn.h>
86 #include <netinet6/ip6_var.h>
87 #endif /* INET6 */
88 
89 #include <netinet/ip_encap.h>
90 #include <net/ethernet.h>
91 #include <net/if_bridgevar.h>
92 #include <net/if_gif.h>
93 
94 #include <security/mac/mac_framework.h>
95 
96 static const char gifname[] = "gif";
97 
98 MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
99 static struct sx gif_ioctl_sx;
100 SX_SYSINIT(gif_ioctl_sx, &gif_ioctl_sx, "gif_ioctl");
101 
102 void	(*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
103 void	(*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
104 void	(*ng_gif_attach_p)(struct ifnet *ifp);
105 void	(*ng_gif_detach_p)(struct ifnet *ifp);
106 
107 #ifdef VIMAGE
108 static void	gif_reassign(struct ifnet *, struct vnet *, char *);
109 #endif
110 static void	gif_delete_tunnel(struct gif_softc *);
111 static int	gif_ioctl(struct ifnet *, u_long, caddr_t);
112 static int	gif_transmit(struct ifnet *, struct mbuf *);
113 static void	gif_qflush(struct ifnet *);
114 static int	gif_clone_create(struct if_clone *, int, caddr_t);
115 static void	gif_clone_destroy(struct ifnet *);
116 VNET_DEFINE_STATIC(struct if_clone *, gif_cloner);
117 #define	V_gif_cloner	VNET(gif_cloner)
118 
119 SYSCTL_DECL(_net_link);
120 static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
121     "Generic Tunnel Interface");
122 #ifndef MAX_GIF_NEST
123 /*
124  * This macro controls the default upper limitation on nesting of gif tunnels.
125  * Since, setting a large value to this macro with a careless configuration
126  * may introduce system crash, we don't allow any nestings by default.
127  * If you need to configure nested gif tunnels, you can define this macro
128  * in your kernel configuration file.  However, if you do so, please be
129  * careful to configure the tunnels so that it won't make a loop.
130  */
131 #define MAX_GIF_NEST 1
132 #endif
133 VNET_DEFINE_STATIC(int, max_gif_nesting) = MAX_GIF_NEST;
134 #define	V_max_gif_nesting	VNET(max_gif_nesting)
135 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
136     &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels");
137 
138 static int
139 gif_clone_create(struct if_clone *ifc, int unit, caddr_t params)
140 {
141 	struct gif_softc *sc;
142 
143 	sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO);
144 	sc->gif_fibnum = curthread->td_proc->p_fibnum;
145 	GIF2IFP(sc) = if_alloc(IFT_GIF);
146 	GIF2IFP(sc)->if_softc = sc;
147 	if_initname(GIF2IFP(sc), gifname, unit);
148 
149 	GIF2IFP(sc)->if_addrlen = 0;
150 	GIF2IFP(sc)->if_mtu    = GIF_MTU;
151 	GIF2IFP(sc)->if_flags  = IFF_POINTOPOINT | IFF_MULTICAST;
152 	GIF2IFP(sc)->if_ioctl  = gif_ioctl;
153 	GIF2IFP(sc)->if_transmit = gif_transmit;
154 	GIF2IFP(sc)->if_qflush = gif_qflush;
155 	GIF2IFP(sc)->if_output = gif_output;
156 #ifdef VIMAGE
157 	GIF2IFP(sc)->if_reassign = gif_reassign;
158 #endif
159 	GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
160 	GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
161 	if_attach(GIF2IFP(sc));
162 	bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
163 	if (ng_gif_attach_p != NULL)
164 		(*ng_gif_attach_p)(GIF2IFP(sc));
165 
166 	return (0);
167 }
168 
169 #ifdef VIMAGE
170 static void
171 gif_reassign(struct ifnet *ifp, struct vnet *new_vnet __unused,
172     char *unused __unused)
173 {
174 	struct gif_softc *sc;
175 
176 	sx_xlock(&gif_ioctl_sx);
177 	sc = ifp->if_softc;
178 	if (sc != NULL)
179 		gif_delete_tunnel(sc);
180 	sx_xunlock(&gif_ioctl_sx);
181 }
182 #endif /* VIMAGE */
183 
184 static void
185 gif_clone_destroy(struct ifnet *ifp)
186 {
187 	struct gif_softc *sc;
188 
189 	sx_xlock(&gif_ioctl_sx);
190 	sc = ifp->if_softc;
191 	gif_delete_tunnel(sc);
192 	if (ng_gif_detach_p != NULL)
193 		(*ng_gif_detach_p)(ifp);
194 	bpfdetach(ifp);
195 	if_detach(ifp);
196 	ifp->if_softc = NULL;
197 	sx_xunlock(&gif_ioctl_sx);
198 
199 	GIF_WAIT();
200 	if_free(ifp);
201 	free(sc, M_GIF);
202 }
203 
204 static void
205 vnet_gif_init(const void *unused __unused)
206 {
207 
208 	V_gif_cloner = if_clone_simple(gifname, gif_clone_create,
209 	    gif_clone_destroy, 0);
210 #ifdef INET
211 	in_gif_init();
212 #endif
213 #ifdef INET6
214 	in6_gif_init();
215 #endif
216 }
217 VNET_SYSINIT(vnet_gif_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
218     vnet_gif_init, NULL);
219 
220 static void
221 vnet_gif_uninit(const void *unused __unused)
222 {
223 
224 	if_clone_detach(V_gif_cloner);
225 #ifdef INET
226 	in_gif_uninit();
227 #endif
228 #ifdef INET6
229 	in6_gif_uninit();
230 #endif
231 }
232 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PSEUDO, SI_ORDER_ANY,
233     vnet_gif_uninit, NULL);
234 
235 static int
236 gifmodevent(module_t mod, int type, void *data)
237 {
238 
239 	switch (type) {
240 	case MOD_LOAD:
241 	case MOD_UNLOAD:
242 		break;
243 	default:
244 		return (EOPNOTSUPP);
245 	}
246 	return (0);
247 }
248 
249 static moduledata_t gif_mod = {
250 	"if_gif",
251 	gifmodevent,
252 	0
253 };
254 
255 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
256 MODULE_VERSION(if_gif, 1);
257 
258 struct gif_list *
259 gif_hashinit(void)
260 {
261 	struct gif_list *hash;
262 	int i;
263 
264 	hash = malloc(sizeof(struct gif_list) * GIF_HASH_SIZE,
265 	    M_GIF, M_WAITOK);
266 	for (i = 0; i < GIF_HASH_SIZE; i++)
267 		CK_LIST_INIT(&hash[i]);
268 
269 	return (hash);
270 }
271 
272 void
273 gif_hashdestroy(struct gif_list *hash)
274 {
275 
276 	free(hash, M_GIF);
277 }
278 
279 #define	MTAG_GIF	1080679712
280 static int
281 gif_transmit(struct ifnet *ifp, struct mbuf *m)
282 {
283 	struct gif_softc *sc;
284 	struct etherip_header *eth;
285 #ifdef INET
286 	struct ip *ip;
287 #endif
288 #ifdef INET6
289 	struct ip6_hdr *ip6;
290 	uint32_t t;
291 #endif
292 	uint32_t af;
293 	uint8_t proto, ecn;
294 	int error;
295 
296 	NET_EPOCH_ASSERT();
297 #ifdef MAC
298 	error = mac_ifnet_check_transmit(ifp, m);
299 	if (error) {
300 		m_freem(m);
301 		goto err;
302 	}
303 #endif
304 	error = ENETDOWN;
305 	sc = ifp->if_softc;
306 	if ((ifp->if_flags & IFF_MONITOR) != 0 ||
307 	    (ifp->if_flags & IFF_UP) == 0 ||
308 	    (ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
309 	    sc->gif_family == 0 ||
310 	    (error = if_tunnel_check_nesting(ifp, m, MTAG_GIF,
311 		V_max_gif_nesting)) != 0) {
312 		m_freem(m);
313 		goto err;
314 	}
315 	/* Now pull back the af that we stashed in the csum_data. */
316 	if (ifp->if_bridge)
317 		af = AF_LINK;
318 	else
319 		af = m->m_pkthdr.csum_data;
320 	m->m_flags &= ~(M_BCAST|M_MCAST);
321 	M_SETFIB(m, sc->gif_fibnum);
322 	BPF_MTAP2(ifp, &af, sizeof(af), m);
323 	if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
324 	if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
325 	/* inner AF-specific encapsulation */
326 	ecn = 0;
327 	switch (af) {
328 #ifdef INET
329 	case AF_INET:
330 		proto = IPPROTO_IPV4;
331 		if (m->m_len < sizeof(struct ip))
332 			m = m_pullup(m, sizeof(struct ip));
333 		if (m == NULL) {
334 			error = ENOBUFS;
335 			goto err;
336 		}
337 		ip = mtod(m, struct ip *);
338 		ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
339 		    ECN_NOCARE, &ecn, &ip->ip_tos);
340 		break;
341 #endif
342 #ifdef INET6
343 	case AF_INET6:
344 		proto = IPPROTO_IPV6;
345 		if (m->m_len < sizeof(struct ip6_hdr))
346 			m = m_pullup(m, sizeof(struct ip6_hdr));
347 		if (m == NULL) {
348 			error = ENOBUFS;
349 			goto err;
350 		}
351 		t = 0;
352 		ip6 = mtod(m, struct ip6_hdr *);
353 		ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
354 		    ECN_NOCARE, &t, &ip6->ip6_flow);
355 		ecn = (ntohl(t) >> 20) & 0xff;
356 		break;
357 #endif
358 	case AF_LINK:
359 		proto = IPPROTO_ETHERIP;
360 		M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT);
361 		if (m == NULL) {
362 			error = ENOBUFS;
363 			goto err;
364 		}
365 		eth = mtod(m, struct etherip_header *);
366 		eth->eip_resvh = 0;
367 		eth->eip_ver = ETHERIP_VERSION;
368 		eth->eip_resvl = 0;
369 		break;
370 	default:
371 		error = EAFNOSUPPORT;
372 		m_freem(m);
373 		goto err;
374 	}
375 	/* XXX should we check if our outer source is legal? */
376 	/* dispatch to output logic based on outer AF */
377 	switch (sc->gif_family) {
378 #ifdef INET
379 	case AF_INET:
380 		error = in_gif_output(ifp, m, proto, ecn);
381 		break;
382 #endif
383 #ifdef INET6
384 	case AF_INET6:
385 		error = in6_gif_output(ifp, m, proto, ecn);
386 		break;
387 #endif
388 	default:
389 		m_freem(m);
390 	}
391 err:
392 	if (error)
393 		if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
394 	return (error);
395 }
396 
397 static void
398 gif_qflush(struct ifnet *ifp __unused)
399 {
400 
401 }
402 
403 int
404 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
405 	struct route *ro)
406 {
407 	uint32_t af;
408 
409 	if (dst->sa_family == AF_UNSPEC)
410 		bcopy(dst->sa_data, &af, sizeof(af));
411 	else
412 		af = RO_GET_FAMILY(ro, dst);
413 	/*
414 	 * Now save the af in the inbound pkt csum data, this is a cheat since
415 	 * we are using the inbound csum_data field to carry the af over to
416 	 * the gif_transmit() routine, avoiding using yet another mtag.
417 	 */
418 	m->m_pkthdr.csum_data = af;
419 	return (ifp->if_transmit(ifp, m));
420 }
421 
422 void
423 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn)
424 {
425 	struct etherip_header *eip;
426 #ifdef INET
427 	struct ip *ip;
428 #endif
429 #ifdef INET6
430 	struct ip6_hdr *ip6;
431 	uint32_t t;
432 #endif
433 	struct ether_header *eh;
434 	struct ifnet *oldifp;
435 	int isr, n, af;
436 
437 	NET_EPOCH_ASSERT();
438 
439 	if (ifp == NULL) {
440 		/* just in case */
441 		m_freem(m);
442 		return;
443 	}
444 	m->m_pkthdr.rcvif = ifp;
445 	m_clrprotoflags(m);
446 	switch (proto) {
447 #ifdef INET
448 	case IPPROTO_IPV4:
449 		af = AF_INET;
450 		if (m->m_len < sizeof(struct ip))
451 			m = m_pullup(m, sizeof(struct ip));
452 		if (m == NULL)
453 			goto drop;
454 		ip = mtod(m, struct ip *);
455 		if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
456 		    ECN_NOCARE, &ecn, &ip->ip_tos) == 0) {
457 			m_freem(m);
458 			goto drop;
459 		}
460 		break;
461 #endif
462 #ifdef INET6
463 	case IPPROTO_IPV6:
464 		af = AF_INET6;
465 		if (m->m_len < sizeof(struct ip6_hdr))
466 			m = m_pullup(m, sizeof(struct ip6_hdr));
467 		if (m == NULL)
468 			goto drop;
469 		t = htonl((uint32_t)ecn << 20);
470 		ip6 = mtod(m, struct ip6_hdr *);
471 		if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
472 		    ECN_NOCARE, &t, &ip6->ip6_flow) == 0) {
473 			m_freem(m);
474 			goto drop;
475 		}
476 		break;
477 #endif
478 	case IPPROTO_ETHERIP:
479 		af = AF_LINK;
480 		break;
481 	default:
482 		m_freem(m);
483 		goto drop;
484 	}
485 
486 #ifdef MAC
487 	mac_ifnet_create_mbuf(ifp, m);
488 #endif
489 
490 	if (bpf_peers_present(ifp->if_bpf)) {
491 		uint32_t af1 = af;
492 		bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
493 	}
494 
495 	if ((ifp->if_flags & IFF_MONITOR) != 0) {
496 		if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
497 		if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
498 		m_freem(m);
499 		return;
500 	}
501 
502 	if (ng_gif_input_p != NULL) {
503 		(*ng_gif_input_p)(ifp, &m, af);
504 		if (m == NULL)
505 			goto drop;
506 	}
507 
508 	/*
509 	 * Put the packet to the network layer input queue according to the
510 	 * specified address family.
511 	 * Note: older versions of gif_input directly called network layer
512 	 * input functions, e.g. ip6_input, here.  We changed the policy to
513 	 * prevent too many recursive calls of such input functions, which
514 	 * might cause kernel panic.  But the change may introduce another
515 	 * problem; if the input queue is full, packets are discarded.
516 	 * The kernel stack overflow really happened, and we believed
517 	 * queue-full rarely occurs, so we changed the policy.
518 	 */
519 	switch (af) {
520 #ifdef INET
521 	case AF_INET:
522 		isr = NETISR_IP;
523 		break;
524 #endif
525 #ifdef INET6
526 	case AF_INET6:
527 		isr = NETISR_IPV6;
528 		break;
529 #endif
530 	case AF_LINK:
531 		n = sizeof(struct etherip_header) +
532 		    sizeof(struct ether_header);
533 		if (n > m->m_len)
534 			m = m_pullup(m, n);
535 		if (m == NULL)
536 			goto drop;
537 		eip = mtod(m, struct etherip_header *);
538 		if (eip->eip_ver != ETHERIP_VERSION) {
539 			/* discard unknown versions */
540 			m_freem(m);
541 			goto drop;
542 		}
543 
544 		m_adj_decap(m, sizeof(struct etherip_header));
545 
546 		m->m_flags &= ~(M_BCAST|M_MCAST);
547 		m->m_pkthdr.rcvif = ifp;
548 
549 		if (ifp->if_bridge) {
550 			oldifp = ifp;
551 			eh = mtod(m, struct ether_header *);
552 			if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
553 				if (ETHER_IS_BROADCAST(eh->ether_dhost))
554 					m->m_flags |= M_BCAST;
555 				else
556 					m->m_flags |= M_MCAST;
557 				if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
558 			}
559 			BRIDGE_INPUT(ifp, m);
560 
561 			if (m != NULL && ifp != oldifp) {
562 				/*
563 				 * The bridge gave us back itself or one of the
564 				 * members for which the frame is addressed.
565 				 */
566 				ether_demux(ifp, m);
567 				return;
568 			}
569 		}
570 		if (m != NULL)
571 			m_freem(m);
572 		return;
573 
574 	default:
575 		if (ng_gif_input_orphan_p != NULL)
576 			(*ng_gif_input_orphan_p)(ifp, m, af);
577 		else
578 			m_freem(m);
579 		return;
580 	}
581 
582 	if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
583 	if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
584 	M_SETFIB(m, ifp->if_fib);
585 	netisr_dispatch(isr, m);
586 	return;
587 drop:
588 	if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
589 }
590 
591 static int
592 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
593 {
594 	struct ifreq *ifr = (struct ifreq*)data;
595 	struct gif_softc *sc;
596 	u_int options;
597 	int error;
598 
599 	switch (cmd) {
600 	case SIOCSIFADDR:
601 		ifp->if_flags |= IFF_UP;
602 	case SIOCADDMULTI:
603 	case SIOCDELMULTI:
604 	case SIOCGIFMTU:
605 	case SIOCSIFFLAGS:
606 		return (0);
607 	case SIOCSIFMTU:
608 		if (ifr->ifr_mtu < GIF_MTU_MIN ||
609 		    ifr->ifr_mtu > GIF_MTU_MAX)
610 			return (EINVAL);
611 		else
612 			ifp->if_mtu = ifr->ifr_mtu;
613 		return (0);
614 	}
615 	sx_xlock(&gif_ioctl_sx);
616 	sc = ifp->if_softc;
617 	if (sc == NULL) {
618 		error = ENXIO;
619 		goto bad;
620 	}
621 	error = 0;
622 	switch (cmd) {
623 	case SIOCDIFPHYADDR:
624 		if (sc->gif_family == 0)
625 			break;
626 		gif_delete_tunnel(sc);
627 		break;
628 #ifdef INET
629 	case SIOCSIFPHYADDR:
630 	case SIOCGIFPSRCADDR:
631 	case SIOCGIFPDSTADDR:
632 		error = in_gif_ioctl(sc, cmd, data);
633 		break;
634 #endif
635 #ifdef INET6
636 	case SIOCSIFPHYADDR_IN6:
637 	case SIOCGIFPSRCADDR_IN6:
638 	case SIOCGIFPDSTADDR_IN6:
639 		error = in6_gif_ioctl(sc, cmd, data);
640 		break;
641 #endif
642 	case SIOCGTUNFIB:
643 		ifr->ifr_fib = sc->gif_fibnum;
644 		break;
645 	case SIOCSTUNFIB:
646 		if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
647 			break;
648 		if (ifr->ifr_fib >= rt_numfibs)
649 			error = EINVAL;
650 		else
651 			sc->gif_fibnum = ifr->ifr_fib;
652 		break;
653 	case GIFGOPTS:
654 		options = sc->gif_options;
655 		error = copyout(&options, ifr_data_get_ptr(ifr),
656 		    sizeof(options));
657 		break;
658 	case GIFSOPTS:
659 		if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
660 			break;
661 		error = copyin(ifr_data_get_ptr(ifr), &options,
662 		    sizeof(options));
663 		if (error)
664 			break;
665 		if (options & ~GIF_OPTMASK) {
666 			error = EINVAL;
667 			break;
668 		}
669 		if (sc->gif_options != options) {
670 			switch (sc->gif_family) {
671 #ifdef INET
672 			case AF_INET:
673 				error = in_gif_setopts(sc, options);
674 				break;
675 #endif
676 #ifdef INET6
677 			case AF_INET6:
678 				error = in6_gif_setopts(sc, options);
679 				break;
680 #endif
681 			default:
682 				/* No need to invoke AF-handler */
683 				sc->gif_options = options;
684 			}
685 		}
686 		break;
687 	default:
688 		error = EINVAL;
689 		break;
690 	}
691 	if (error == 0 && sc->gif_family != 0) {
692 		if (
693 #ifdef INET
694 		    cmd == SIOCSIFPHYADDR ||
695 #endif
696 #ifdef INET6
697 		    cmd == SIOCSIFPHYADDR_IN6 ||
698 #endif
699 		    0) {
700 			if_link_state_change(ifp, LINK_STATE_UP);
701 		}
702 	}
703 bad:
704 	sx_xunlock(&gif_ioctl_sx);
705 	return (error);
706 }
707 
708 static void
709 gif_delete_tunnel(struct gif_softc *sc)
710 {
711 
712 	sx_assert(&gif_ioctl_sx, SA_XLOCKED);
713 	if (sc->gif_family != 0) {
714 		CK_LIST_REMOVE(sc, srchash);
715 		CK_LIST_REMOVE(sc, chain);
716 		/* Wait until it become safe to free gif_hdr */
717 		GIF_WAIT();
718 		free(sc->gif_hdr, M_GIF);
719 	}
720 	sc->gif_family = 0;
721 	GIF2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
722 	if_link_state_change(GIF2IFP(sc), LINK_STATE_DOWN);
723 }
724