xref: /freebsd/sys/netinet6/ip6_gre.c (revision f374ba41f55c1a127303d92d830dd58eef2f5243)
1 /*-
2  * Copyright (c) 2014, 2018 Andrey V. Elsukov <ae@FreeBSD.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  */
26 
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29 
30 #include "opt_inet.h"
31 #include "opt_inet6.h"
32 
33 #include <sys/param.h>
34 #include <sys/jail.h>
35 #include <sys/systm.h>
36 #include <sys/socket.h>
37 #include <sys/socketvar.h>
38 #include <sys/sockio.h>
39 #include <sys/mbuf.h>
40 #include <sys/errno.h>
41 #include <sys/kernel.h>
42 #include <sys/sysctl.h>
43 #include <sys/malloc.h>
44 #include <sys/proc.h>
45 
46 #include <net/if.h>
47 #include <net/if_var.h>
48 #include <net/if_private.h>
49 #include <net/vnet.h>
50 
51 #include <netinet/in.h>
52 #ifdef INET
53 #include <net/ethernet.h>
54 #include <netinet/ip.h>
55 #endif
56 #include <netinet/in_pcb.h>
57 #include <netinet/ip_encap.h>
58 #include <netinet/ip_var.h>
59 #include <netinet/ip6.h>
60 #include <netinet/udp.h>
61 #include <netinet/udp_var.h>
62 #include <netinet6/ip6_var.h>
63 #include <netinet6/in6_var.h>
64 #include <netinet6/scope6_var.h>
65 #include <net/if_gre.h>
66 
67 VNET_DEFINE(int, ip6_gre_hlim) = IPV6_DEFHLIM;
68 #define	V_ip6_gre_hlim		VNET(ip6_gre_hlim)
69 
70 SYSCTL_DECL(_net_inet6_ip6);
71 SYSCTL_INT(_net_inet6_ip6, OID_AUTO, grehlim, CTLFLAG_VNET | CTLFLAG_RW,
72     &VNET_NAME(ip6_gre_hlim), 0, "Default hop limit for encapsulated packets");
73 
74 struct in6_gre_socket {
75 	struct gre_socket	base;
76 	struct in6_addr		addr; /* scope zone id is embedded */
77 };
78 VNET_DEFINE_STATIC(struct gre_sockets *, ipv6_sockets) = NULL;
79 VNET_DEFINE_STATIC(struct gre_list *, ipv6_hashtbl) = NULL;
80 VNET_DEFINE_STATIC(struct gre_list *, ipv6_srchashtbl) = NULL;
81 #define	V_ipv6_sockets		VNET(ipv6_sockets)
82 #define	V_ipv6_hashtbl		VNET(ipv6_hashtbl)
83 #define	V_ipv6_srchashtbl	VNET(ipv6_srchashtbl)
84 #define	GRE_HASH(src, dst)	(V_ipv6_hashtbl[\
85     in6_gre_hashval((src), (dst)) & (GRE_HASH_SIZE - 1)])
86 #define	GRE_SRCHASH(src)	(V_ipv6_srchashtbl[\
87     fnv_32_buf((src), sizeof(*src), FNV1_32_INIT) & (GRE_HASH_SIZE - 1)])
88 #define	GRE_SOCKHASH(src)	(V_ipv6_sockets[\
89     fnv_32_buf((src), sizeof(*src), FNV1_32_INIT) & (GRE_HASH_SIZE - 1)])
90 #define	GRE_HASH_SC(sc)		GRE_HASH(&(sc)->gre_oip6.ip6_src,\
91     &(sc)->gre_oip6.ip6_dst)
92 
93 static uint32_t
94 in6_gre_hashval(const struct in6_addr *src, const struct in6_addr *dst)
95 {
96 	uint32_t ret;
97 
98 	ret = fnv_32_buf(src, sizeof(*src), FNV1_32_INIT);
99 	return (fnv_32_buf(dst, sizeof(*dst), ret));
100 }
101 
102 static struct gre_socket*
103 in6_gre_lookup_socket(const struct in6_addr *addr)
104 {
105 	struct gre_socket *gs;
106 	struct in6_gre_socket *s;
107 
108 	CK_LIST_FOREACH(gs, &GRE_SOCKHASH(addr), chain) {
109 		s = __containerof(gs, struct in6_gre_socket, base);
110 		if (IN6_ARE_ADDR_EQUAL(&s->addr, addr))
111 			break;
112 	}
113 	return (gs);
114 }
115 
116 static int
117 in6_gre_checkdup(const struct gre_softc *sc, const struct in6_addr *src,
118     const struct in6_addr *dst, uint32_t opts)
119 {
120 	struct gre_list *head;
121 	struct gre_softc *tmp;
122 	struct gre_socket *gs;
123 
124 	if (sc->gre_family == AF_INET6 &&
125 	    IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src, src) &&
126 	    IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, dst) &&
127 	    (sc->gre_options & GRE_UDPENCAP) == (opts & GRE_UDPENCAP))
128 		return (EEXIST);
129 
130 	if (opts & GRE_UDPENCAP) {
131 		gs = in6_gre_lookup_socket(src);
132 		if (gs == NULL)
133 			return (0);
134 		head = &gs->list;
135 	} else
136 		head = &GRE_HASH(src, dst);
137 
138 	CK_LIST_FOREACH(tmp, head, chain) {
139 		if (tmp == sc)
140 			continue;
141 		if (IN6_ARE_ADDR_EQUAL(&tmp->gre_oip6.ip6_src, src) &&
142 		    IN6_ARE_ADDR_EQUAL(&tmp->gre_oip6.ip6_dst, dst))
143 			return (EADDRNOTAVAIL);
144 	}
145 	return (0);
146 }
147 
148 static int
149 in6_gre_lookup(const struct mbuf *m, int off, int proto, void **arg)
150 {
151 	const struct ip6_hdr *ip6;
152 	struct gre_softc *sc;
153 
154 	if (V_ipv6_hashtbl == NULL)
155 		return (0);
156 
157 	NET_EPOCH_ASSERT();
158 	ip6 = mtod(m, const struct ip6_hdr *);
159 	CK_LIST_FOREACH(sc, &GRE_HASH(&ip6->ip6_dst, &ip6->ip6_src), chain) {
160 		/*
161 		 * This is an inbound packet, its ip6_dst is source address
162 		 * in softc.
163 		 */
164 		if (IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src,
165 		    &ip6->ip6_dst) &&
166 		    IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst,
167 		    &ip6->ip6_src)) {
168 			if ((GRE2IFP(sc)->if_flags & IFF_UP) == 0)
169 				return (0);
170 			*arg = sc;
171 			return (ENCAP_DRV_LOOKUP);
172 		}
173 	}
174 	return (0);
175 }
176 
177 /*
178  * Check that ingress address belongs to local host.
179  */
180 static void
181 in6_gre_set_running(struct gre_softc *sc)
182 {
183 
184 	if (in6_localip(&sc->gre_oip6.ip6_src))
185 		GRE2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
186 	else
187 		GRE2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
188 }
189 
190 /*
191  * ifaddr_event handler.
192  * Clear IFF_DRV_RUNNING flag when ingress address disappears to prevent
193  * source address spoofing.
194  */
195 static void
196 in6_gre_srcaddr(void *arg __unused, const struct sockaddr *sa,
197     int event __unused)
198 {
199 	const struct sockaddr_in6 *sin;
200 	struct gre_softc *sc;
201 
202 	/* Check that VNET is ready */
203 	if (V_ipv6_hashtbl == NULL)
204 		return;
205 
206 	NET_EPOCH_ASSERT();
207 	sin = (const struct sockaddr_in6 *)sa;
208 	CK_LIST_FOREACH(sc, &GRE_SRCHASH(&sin->sin6_addr), srchash) {
209 		if (IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_src,
210 		    &sin->sin6_addr) == 0)
211 			continue;
212 		in6_gre_set_running(sc);
213 	}
214 }
215 
216 static bool
217 in6_gre_udp_input(struct mbuf *m, int off, struct inpcb *inp,
218     const struct sockaddr *sa, void *ctx)
219 {
220 	struct gre_socket *gs;
221 	struct gre_softc *sc;
222 	struct sockaddr_in6 dst;
223 
224 	NET_EPOCH_ASSERT();
225 
226 	gs = (struct gre_socket *)ctx;
227 	dst = *(const struct sockaddr_in6 *)sa;
228 	if (sa6_embedscope(&dst, 0)) {
229 		m_freem(m);
230 		return (true);
231 	}
232 	CK_LIST_FOREACH(sc, &gs->list, chain) {
233 		if (IN6_ARE_ADDR_EQUAL(&sc->gre_oip6.ip6_dst, &dst.sin6_addr))
234 			break;
235 	}
236 	if (sc != NULL && (GRE2IFP(sc)->if_flags & IFF_UP) != 0){
237 		gre_input(m, off + sizeof(struct udphdr), IPPROTO_UDP, sc);
238 		return (true);
239 	}
240 	m_freem(m);
241 
242 	return (true);
243 }
244 
245 static int
246 in6_gre_setup_socket(struct gre_softc *sc)
247 {
248 	struct sockopt sopt;
249 	struct sockaddr_in6 sin6;
250 	struct in6_gre_socket *s;
251 	struct gre_socket *gs;
252 	int error, value;
253 
254 	/*
255 	 * NOTE: we are protected with gre_ioctl_sx lock.
256 	 *
257 	 * First check that socket is already configured.
258 	 * If so, check that source address was not changed.
259 	 * If address is different, check that there are no other tunnels
260 	 * and close socket.
261 	 */
262 	gs = sc->gre_so;
263 	if (gs != NULL) {
264 		s = __containerof(gs, struct in6_gre_socket, base);
265 		if (!IN6_ARE_ADDR_EQUAL(&s->addr, &sc->gre_oip6.ip6_src)) {
266 			if (CK_LIST_EMPTY(&gs->list)) {
267 				CK_LIST_REMOVE(gs, chain);
268 				soclose(gs->so);
269 				NET_EPOCH_CALL(gre_sofree, &gs->epoch_ctx);
270 			}
271 			gs = sc->gre_so = NULL;
272 		}
273 	}
274 
275 	if (gs == NULL) {
276 		/*
277 		 * Check that socket for given address is already
278 		 * configured.
279 		 */
280 		gs = in6_gre_lookup_socket(&sc->gre_oip6.ip6_src);
281 		if (gs == NULL) {
282 			s = malloc(sizeof(*s), M_GRE, M_WAITOK | M_ZERO);
283 			s->addr = sc->gre_oip6.ip6_src;
284 			gs = &s->base;
285 
286 			error = socreate(sc->gre_family, &gs->so,
287 			    SOCK_DGRAM, IPPROTO_UDP, curthread->td_ucred,
288 			    curthread);
289 			if (error != 0) {
290 				if_printf(GRE2IFP(sc),
291 				    "cannot create socket: %d\n", error);
292 				free(s, M_GRE);
293 				return (error);
294 			}
295 
296 			error = udp_set_kernel_tunneling(gs->so,
297 			    in6_gre_udp_input, NULL, gs);
298 			if (error != 0) {
299 				if_printf(GRE2IFP(sc),
300 				    "cannot set UDP tunneling: %d\n", error);
301 				goto fail;
302 			}
303 
304 			memset(&sopt, 0, sizeof(sopt));
305 			sopt.sopt_dir = SOPT_SET;
306 			sopt.sopt_level = IPPROTO_IPV6;
307 			sopt.sopt_name = IPV6_BINDANY;
308 			sopt.sopt_val = &value;
309 			sopt.sopt_valsize = sizeof(value);
310 			value = 1;
311 			error = sosetopt(gs->so, &sopt);
312 			if (error != 0) {
313 				if_printf(GRE2IFP(sc),
314 				    "cannot set IPV6_BINDANY opt: %d\n",
315 				    error);
316 				goto fail;
317 			}
318 
319 			memset(&sin6, 0, sizeof(sin6));
320 			sin6.sin6_family = AF_INET6;
321 			sin6.sin6_len = sizeof(sin6);
322 			sin6.sin6_addr = sc->gre_oip6.ip6_src;
323 			sin6.sin6_port = htons(GRE_UDPPORT);
324 			error = sa6_recoverscope(&sin6);
325 			if (error != 0) {
326 				if_printf(GRE2IFP(sc),
327 				    "cannot determine scope zone id: %d\n",
328 				    error);
329 				goto fail;
330 			}
331 			error = sobind(gs->so, (struct sockaddr *)&sin6,
332 			    curthread);
333 			if (error != 0) {
334 				if_printf(GRE2IFP(sc),
335 				    "cannot bind socket: %d\n", error);
336 				goto fail;
337 			}
338 			/* Add socket to the chain */
339 			CK_LIST_INSERT_HEAD(
340 			    &GRE_SOCKHASH(&sc->gre_oip6.ip6_src), gs, chain);
341 		}
342 	}
343 
344 	/* Add softc to the socket's list */
345 	CK_LIST_INSERT_HEAD(&gs->list, sc, chain);
346 	sc->gre_so = gs;
347 	return (0);
348 fail:
349 	soclose(gs->so);
350 	free(s, M_GRE);
351 	return (error);
352 }
353 
354 static int
355 in6_gre_attach(struct gre_softc *sc)
356 {
357 	struct grehdr *gh;
358 	int error;
359 
360 	if (sc->gre_options & GRE_UDPENCAP) {
361 		sc->gre_csumflags = CSUM_UDP_IPV6;
362 		sc->gre_hlen = sizeof(struct greudp6);
363 		sc->gre_oip6.ip6_nxt = IPPROTO_UDP;
364 		gh = &sc->gre_udp6hdr->gi6_gre;
365 		gre_update_udphdr(sc, &sc->gre_udp6,
366 		    in6_cksum_pseudo(&sc->gre_oip6, 0, 0, 0));
367 	} else {
368 		sc->gre_hlen = sizeof(struct greip6);
369 		sc->gre_oip6.ip6_nxt = IPPROTO_GRE;
370 		gh = &sc->gre_ip6hdr->gi6_gre;
371 	}
372 	sc->gre_oip6.ip6_vfc = IPV6_VERSION;
373 	gre_update_hdr(sc, gh);
374 
375 	/*
376 	 * If we return error, this means that sc is not linked,
377 	 * and caller should reset gre_family and free(sc->gre_hdr).
378 	 */
379 	if (sc->gre_options & GRE_UDPENCAP) {
380 		error = in6_gre_setup_socket(sc);
381 		if (error != 0)
382 			return (error);
383 	} else
384 		CK_LIST_INSERT_HEAD(&GRE_HASH_SC(sc), sc, chain);
385 	CK_LIST_INSERT_HEAD(&GRE_SRCHASH(&sc->gre_oip6.ip6_src), sc, srchash);
386 
387 	/* Set IFF_DRV_RUNNING if interface is ready */
388 	in6_gre_set_running(sc);
389 	return (0);
390 }
391 
392 int
393 in6_gre_setopts(struct gre_softc *sc, u_long cmd, uint32_t value)
394 {
395 	int error;
396 
397 	/* NOTE: we are protected with gre_ioctl_sx lock */
398 	MPASS(cmd == GRESKEY || cmd == GRESOPTS || cmd == GRESPORT);
399 	MPASS(sc->gre_family == AF_INET6);
400 
401 	/*
402 	 * If we are going to change encapsulation protocol, do check
403 	 * for duplicate tunnels. Return EEXIST here to do not confuse
404 	 * user.
405 	 */
406 	if (cmd == GRESOPTS &&
407 	    (sc->gre_options & GRE_UDPENCAP) != (value & GRE_UDPENCAP) &&
408 	    in6_gre_checkdup(sc, &sc->gre_oip6.ip6_src,
409 		&sc->gre_oip6.ip6_dst, value) == EADDRNOTAVAIL)
410 		return (EEXIST);
411 
412 	CK_LIST_REMOVE(sc, chain);
413 	CK_LIST_REMOVE(sc, srchash);
414 	GRE_WAIT();
415 	switch (cmd) {
416 	case GRESKEY:
417 		sc->gre_key = value;
418 		break;
419 	case GRESOPTS:
420 		sc->gre_options = value;
421 		break;
422 	case GRESPORT:
423 		sc->gre_port = value;
424 		break;
425 	}
426 	error = in6_gre_attach(sc);
427 	if (error != 0) {
428 		sc->gre_family = 0;
429 		free(sc->gre_hdr, M_GRE);
430 	}
431 	return (error);
432 }
433 
434 int
435 in6_gre_ioctl(struct gre_softc *sc, u_long cmd, caddr_t data)
436 {
437 	struct in6_ifreq *ifr = (struct in6_ifreq *)data;
438 	struct sockaddr_in6 *dst, *src;
439 	struct ip6_hdr *ip6;
440 	int error;
441 
442 	/* NOTE: we are protected with gre_ioctl_sx lock */
443 	error = EINVAL;
444 	switch (cmd) {
445 	case SIOCSIFPHYADDR_IN6:
446 		src = &((struct in6_aliasreq *)data)->ifra_addr;
447 		dst = &((struct in6_aliasreq *)data)->ifra_dstaddr;
448 
449 		/* sanity checks */
450 		if (src->sin6_family != dst->sin6_family ||
451 		    src->sin6_family != AF_INET6 ||
452 		    src->sin6_len != dst->sin6_len ||
453 		    src->sin6_len != sizeof(*src))
454 			break;
455 		if (IN6_IS_ADDR_UNSPECIFIED(&src->sin6_addr) ||
456 		    IN6_IS_ADDR_UNSPECIFIED(&dst->sin6_addr)) {
457 			error = EADDRNOTAVAIL;
458 			break;
459 		}
460 		/*
461 		 * Check validity of the scope zone ID of the
462 		 * addresses, and convert it into the kernel
463 		 * internal form if necessary.
464 		 */
465 		if ((error = sa6_embedscope(src, 0)) != 0 ||
466 		    (error = sa6_embedscope(dst, 0)) != 0)
467 			break;
468 
469 		if (V_ipv6_hashtbl == NULL) {
470 			V_ipv6_hashtbl = gre_hashinit();
471 			V_ipv6_srchashtbl = gre_hashinit();
472 			V_ipv6_sockets = (struct gre_sockets *)gre_hashinit();
473 		}
474 		error = in6_gre_checkdup(sc, &src->sin6_addr,
475 		    &dst->sin6_addr, sc->gre_options);
476 		if (error == EADDRNOTAVAIL)
477 			break;
478 		if (error == EEXIST) {
479 			/* Addresses are the same. Just return. */
480 			error = 0;
481 			break;
482 		}
483 		ip6 = malloc(sizeof(struct greudp6) + 3 * sizeof(uint32_t),
484 		    M_GRE, M_WAITOK | M_ZERO);
485 		ip6->ip6_src = src->sin6_addr;
486 		ip6->ip6_dst = dst->sin6_addr;
487 		if (sc->gre_family != 0) {
488 			/* Detach existing tunnel first */
489 			CK_LIST_REMOVE(sc, chain);
490 			CK_LIST_REMOVE(sc, srchash);
491 			GRE_WAIT();
492 			free(sc->gre_hdr, M_GRE);
493 			/* XXX: should we notify about link state change? */
494 		}
495 		sc->gre_family = AF_INET6;
496 		sc->gre_hdr = ip6;
497 		sc->gre_oseq = 0;
498 		sc->gre_iseq = UINT32_MAX;
499 		error = in6_gre_attach(sc);
500 		if (error != 0) {
501 			sc->gre_family = 0;
502 			free(sc->gre_hdr, M_GRE);
503 		}
504 		break;
505 	case SIOCGIFPSRCADDR_IN6:
506 	case SIOCGIFPDSTADDR_IN6:
507 		if (sc->gre_family != AF_INET6) {
508 			error = EADDRNOTAVAIL;
509 			break;
510 		}
511 		src = (struct sockaddr_in6 *)&ifr->ifr_addr;
512 		memset(src, 0, sizeof(*src));
513 		src->sin6_family = AF_INET6;
514 		src->sin6_len = sizeof(*src);
515 		src->sin6_addr = (cmd == SIOCGIFPSRCADDR_IN6) ?
516 		    sc->gre_oip6.ip6_src: sc->gre_oip6.ip6_dst;
517 		error = prison_if(curthread->td_ucred, (struct sockaddr *)src);
518 		if (error == 0)
519 			error = sa6_recoverscope(src);
520 		if (error != 0)
521 			memset(src, 0, sizeof(*src));
522 		break;
523 	}
524 	return (error);
525 }
526 
527 int
528 in6_gre_output(struct mbuf *m, int af __unused, int hlen __unused,
529     uint32_t flowid)
530 {
531 	struct greip6 *gi6;
532 
533 	gi6 = mtod(m, struct greip6 *);
534 	gi6->gi6_ip6.ip6_hlim = V_ip6_gre_hlim;
535 	gi6->gi6_ip6.ip6_flow |= flowid & IPV6_FLOWLABEL_MASK;
536 	return (ip6_output(m, NULL, NULL, IPV6_MINMTU, NULL, NULL, NULL));
537 }
538 
539 static const struct srcaddrtab *ipv6_srcaddrtab = NULL;
540 static const struct encaptab *ecookie = NULL;
541 static const struct encap_config ipv6_encap_cfg = {
542 	.proto = IPPROTO_GRE,
543 	.min_length = sizeof(struct greip6) +
544 #ifdef INET
545 	    sizeof(struct ip),
546 #else
547 	    sizeof(struct ip6_hdr),
548 #endif
549 	.exact_match = ENCAP_DRV_LOOKUP,
550 	.lookup = in6_gre_lookup,
551 	.input = gre_input
552 };
553 
554 void
555 in6_gre_init(void)
556 {
557 
558 	if (!IS_DEFAULT_VNET(curvnet))
559 		return;
560 	ipv6_srcaddrtab = ip6_encap_register_srcaddr(in6_gre_srcaddr,
561 	    NULL, M_WAITOK);
562 	ecookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK);
563 }
564 
565 void
566 in6_gre_uninit(void)
567 {
568 
569 	if (IS_DEFAULT_VNET(curvnet)) {
570 		ip6_encap_detach(ecookie);
571 		ip6_encap_unregister_srcaddr(ipv6_srcaddrtab);
572 	}
573 	if (V_ipv6_hashtbl != NULL) {
574 		gre_hashdestroy(V_ipv6_hashtbl);
575 		V_ipv6_hashtbl = NULL;
576 		GRE_WAIT();
577 		gre_hashdestroy(V_ipv6_srchashtbl);
578 		gre_hashdestroy((struct gre_list *)V_ipv6_sockets);
579 	}
580 }
581