xref: /freebsd/sys/net/if_me.c (revision f4f33ea0c752ff0f9bfad34991d5bbb54e71133d) 
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 <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/jail.h>
33 #include <sys/kernel.h>
34 #include <sys/lock.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37 #include <sys/mbuf.h>
38 #include <sys/priv.h>
39 #include <sys/proc.h>
40 #include <sys/socket.h>
41 #include <sys/sockio.h>
42 #include <sys/sx.h>
43 #include <sys/sysctl.h>
44 #include <sys/syslog.h>
45 
46 #include <net/bpf.h>
47 #include <net/ethernet.h>
48 #include <net/if.h>
49 #include <net/if_var.h>
50 #include <net/if_clone.h>
51 #include <net/if_types.h>
52 #include <net/netisr.h>
53 #include <net/vnet.h>
54 #include <net/route.h>
55 
56 #include <netinet/in.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/in_var.h>
59 #include <netinet/ip.h>
60 #include <netinet/ip_var.h>
61 #include <netinet/ip_encap.h>
62 
63 #include <machine/in_cksum.h>
64 #include <security/mac/mac_framework.h>
65 
66 #define	MEMTU			(1500 - sizeof(struct mobhdr))
67 static const char mename[] = "me";
68 static MALLOC_DEFINE(M_IFME, mename, "Minimal Encapsulation for IP");
69 /* Minimal forwarding header RFC 2004 */
70 struct mobhdr {
71 	uint8_t		mob_proto;	/* protocol */
72 	uint8_t		mob_flags;	/* flags */
73 #define	MOB_FLAGS_SP	0x80		/* source present */
74 	uint16_t	mob_csum;	/* header checksum */
75 	struct in_addr	mob_dst;	/* original destination address */
76 	struct in_addr	mob_src;	/* original source addr (optional) */
77 } __packed;
78 
79 struct me_softc {
80 	struct ifnet		*me_ifp;
81 	u_int			me_fibnum;
82 	struct in_addr		me_src;
83 	struct in_addr		me_dst;
84 
85 	CK_LIST_ENTRY(me_softc) chain;
86 };
87 CK_LIST_HEAD(me_list, me_softc);
88 #define	ME2IFP(sc)		((sc)->me_ifp)
89 #define	ME_READY(sc)		((sc)->me_src.s_addr != 0)
90 #define	ME_RLOCK()		struct epoch_tracker me_et; epoch_enter_preempt(net_epoch_preempt, &me_et)
91 #define	ME_RUNLOCK()		epoch_exit_preempt(net_epoch_preempt, &me_et)
92 #define	ME_WAIT()		epoch_wait_preempt(net_epoch_preempt)
93 
94 #ifndef ME_HASH_SIZE
95 #define	ME_HASH_SIZE	(1 << 4)
96 #endif
97 VNET_DEFINE_STATIC(struct me_list *, me_hashtbl) = NULL;
98 #define	V_me_hashtbl		VNET(me_hashtbl)
99 #define	ME_HASH(src, dst)	(V_me_hashtbl[\
100     me_hashval((src), (dst)) & (ME_HASH_SIZE - 1)])
101 
102 static struct sx me_ioctl_sx;
103 SX_SYSINIT(me_ioctl_sx, &me_ioctl_sx, "me_ioctl");
104 
105 static int	me_clone_create(struct if_clone *, int, caddr_t);
106 static void	me_clone_destroy(struct ifnet *);
107 VNET_DEFINE_STATIC(struct if_clone *, me_cloner);
108 #define	V_me_cloner	VNET(me_cloner)
109 
110 static void	me_qflush(struct ifnet *);
111 static int	me_transmit(struct ifnet *, struct mbuf *);
112 static int	me_ioctl(struct ifnet *, u_long, caddr_t);
113 static int	me_output(struct ifnet *, struct mbuf *,
114 		    const struct sockaddr *, struct route *);
115 static int	me_input(struct mbuf *, int, int, void *);
116 
117 static int	me_set_tunnel(struct me_softc *, in_addr_t, in_addr_t);
118 static void	me_delete_tunnel(struct me_softc *);
119 
120 SYSCTL_DECL(_net_link);
121 static SYSCTL_NODE(_net_link, IFT_TUNNEL, me, CTLFLAG_RW, 0,
122     "Minimal Encapsulation for IP (RFC 2004)");
123 #ifndef MAX_ME_NEST
124 #define MAX_ME_NEST 1
125 #endif
126 
127 VNET_DEFINE_STATIC(int, max_me_nesting) = MAX_ME_NEST;
128 #define	V_max_me_nesting	VNET(max_me_nesting)
129 SYSCTL_INT(_net_link_me, OID_AUTO, max_nesting, CTLFLAG_RW | CTLFLAG_VNET,
130     &VNET_NAME(max_me_nesting), 0, "Max nested tunnels");
131 
132 static uint32_t
133 me_hashval(in_addr_t src, in_addr_t dst)
134 {
135 	uint32_t ret;
136 
137 	ret = fnv_32_buf(&src, sizeof(src), FNV1_32_INIT);
138 	return (fnv_32_buf(&dst, sizeof(dst), ret));
139 }
140 
141 static struct me_list *
142 me_hashinit(void)
143 {
144 	struct me_list *hash;
145 	int i;
146 
147 	hash = malloc(sizeof(struct me_list) * ME_HASH_SIZE,
148 	    M_IFME, M_WAITOK);
149 	for (i = 0; i < ME_HASH_SIZE; i++)
150 		CK_LIST_INIT(&hash[i]);
151 
152 	return (hash);
153 }
154 
155 static void
156 vnet_me_init(const void *unused __unused)
157 {
158 	V_me_cloner = if_clone_simple(mename, me_clone_create,
159 	    me_clone_destroy, 0);
160 }
161 VNET_SYSINIT(vnet_me_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
162     vnet_me_init, NULL);
163 
164 static void
165 vnet_me_uninit(const void *unused __unused)
166 {
167 
168 	if (V_me_hashtbl != NULL)
169 		free(V_me_hashtbl, M_IFME);
170 	if_clone_detach(V_me_cloner);
171 }
172 VNET_SYSUNINIT(vnet_me_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
173     vnet_me_uninit, NULL);
174 
175 static int
176 me_clone_create(struct if_clone *ifc, int unit, caddr_t params)
177 {
178 	struct me_softc *sc;
179 
180 	sc = malloc(sizeof(struct me_softc), M_IFME, M_WAITOK | M_ZERO);
181 	sc->me_fibnum = curthread->td_proc->p_fibnum;
182 	ME2IFP(sc) = if_alloc(IFT_TUNNEL);
183 	ME2IFP(sc)->if_softc = sc;
184 	if_initname(ME2IFP(sc), mename, unit);
185 
186 	ME2IFP(sc)->if_mtu = MEMTU;;
187 	ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
188 	ME2IFP(sc)->if_output = me_output;
189 	ME2IFP(sc)->if_ioctl = me_ioctl;
190 	ME2IFP(sc)->if_transmit = me_transmit;
191 	ME2IFP(sc)->if_qflush = me_qflush;
192 	ME2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
193 	ME2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
194 	if_attach(ME2IFP(sc));
195 	bpfattach(ME2IFP(sc), DLT_NULL, sizeof(u_int32_t));
196 	return (0);
197 }
198 
199 static void
200 me_clone_destroy(struct ifnet *ifp)
201 {
202 	struct me_softc *sc;
203 
204 	sx_xlock(&me_ioctl_sx);
205 	sc = ifp->if_softc;
206 	me_delete_tunnel(sc);
207 	bpfdetach(ifp);
208 	if_detach(ifp);
209 	ifp->if_softc = NULL;
210 	sx_xunlock(&me_ioctl_sx);
211 
212 	ME_WAIT();
213 	if_free(ifp);
214 	free(sc, M_IFME);
215 }
216 
217 static int
218 me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
219 {
220 	struct ifreq *ifr = (struct ifreq *)data;
221 	struct sockaddr_in *src, *dst;
222 	struct me_softc *sc;
223 	int error;
224 
225 	switch (cmd) {
226 	case SIOCSIFMTU:
227 		if (ifr->ifr_mtu < 576)
228 			return (EINVAL);
229 		ifp->if_mtu = ifr->ifr_mtu;
230 		return (0);
231 	case SIOCSIFADDR:
232 		ifp->if_flags |= IFF_UP;
233 	case SIOCSIFFLAGS:
234 	case SIOCADDMULTI:
235 	case SIOCDELMULTI:
236 		return (0);
237 	}
238 	sx_xlock(&me_ioctl_sx);
239 	sc = ifp->if_softc;
240 	if (sc == NULL) {
241 		error = ENXIO;
242 		goto end;
243 	}
244 	error = 0;
245 	switch (cmd) {
246 	case SIOCSIFPHYADDR:
247 		src = &((struct in_aliasreq *)data)->ifra_addr;
248 		dst = &((struct in_aliasreq *)data)->ifra_dstaddr;
249 		if (src->sin_family != dst->sin_family ||
250 		    src->sin_family != AF_INET ||
251 		    src->sin_len != dst->sin_len ||
252 		    src->sin_len != sizeof(struct sockaddr_in)) {
253 			error = EINVAL;
254 			break;
255 		}
256 		if (src->sin_addr.s_addr == INADDR_ANY ||
257 		    dst->sin_addr.s_addr == INADDR_ANY) {
258 			error = EADDRNOTAVAIL;
259 			break;
260 		}
261 		error = me_set_tunnel(sc, src->sin_addr.s_addr,
262 		    dst->sin_addr.s_addr);
263 		break;
264 	case SIOCDIFPHYADDR:
265 		me_delete_tunnel(sc);
266 		break;
267 	case SIOCGIFPSRCADDR:
268 	case SIOCGIFPDSTADDR:
269 		if (!ME_READY(sc)) {
270 			error = EADDRNOTAVAIL;
271 			break;
272 		}
273 		src = (struct sockaddr_in *)&ifr->ifr_addr;
274 		memset(src, 0, sizeof(*src));
275 		src->sin_family = AF_INET;
276 		src->sin_len = sizeof(*src);
277 		switch (cmd) {
278 		case SIOCGIFPSRCADDR:
279 			src->sin_addr = sc->me_src;
280 			break;
281 		case SIOCGIFPDSTADDR:
282 			src->sin_addr = sc->me_dst;
283 			break;
284 		}
285 		error = prison_if(curthread->td_ucred, sintosa(src));
286 		if (error != 0)
287 			memset(src, 0, sizeof(*src));
288 		break;
289 	case SIOCGTUNFIB:
290 		ifr->ifr_fib = sc->me_fibnum;
291 		break;
292 	case SIOCSTUNFIB:
293 		if ((error = priv_check(curthread, PRIV_NET_GRE)) != 0)
294 			break;
295 		if (ifr->ifr_fib >= rt_numfibs)
296 			error = EINVAL;
297 		else
298 			sc->me_fibnum = ifr->ifr_fib;
299 		break;
300 	default:
301 		error = EINVAL;
302 		break;
303 	}
304 end:
305 	sx_xunlock(&me_ioctl_sx);
306 	return (error);
307 }
308 
309 static int
310 me_lookup(const struct mbuf *m, int off, int proto, void **arg)
311 {
312 	const struct ip *ip;
313 	struct me_softc *sc;
314 
315 	if (V_me_hashtbl == NULL)
316 		return (0);
317 
318 	MPASS(in_epoch(net_epoch_preempt));
319 	ip = mtod(m, const struct ip *);
320 	CK_LIST_FOREACH(sc, &ME_HASH(ip->ip_dst.s_addr,
321 	    ip->ip_src.s_addr), chain) {
322 		if (sc->me_src.s_addr == ip->ip_dst.s_addr &&
323 		    sc->me_dst.s_addr == ip->ip_src.s_addr) {
324 			if ((ME2IFP(sc)->if_flags & IFF_UP) == 0)
325 				return (0);
326 			*arg = sc;
327 			return (ENCAP_DRV_LOOKUP);
328 		}
329 	}
330 	return (0);
331 }
332 
333 static int
334 me_set_tunnel(struct me_softc *sc, in_addr_t src, in_addr_t dst)
335 {
336 	struct me_softc *tmp;
337 
338 	sx_assert(&me_ioctl_sx, SA_XLOCKED);
339 
340 	if (V_me_hashtbl == NULL)
341 		V_me_hashtbl = me_hashinit();
342 
343 	if (sc->me_src.s_addr == src && sc->me_dst.s_addr == dst)
344 		return (0);
345 
346 	CK_LIST_FOREACH(tmp, &ME_HASH(src, dst), chain) {
347 		if (tmp == sc)
348 			continue;
349 		if (tmp->me_src.s_addr == src &&
350 		    tmp->me_dst.s_addr == dst)
351 			return (EADDRNOTAVAIL);
352 	}
353 
354 	me_delete_tunnel(sc);
355 	sc->me_dst.s_addr = dst;
356 	sc->me_src.s_addr = src;
357 	CK_LIST_INSERT_HEAD(&ME_HASH(src, dst), sc, chain);
358 
359 	ME2IFP(sc)->if_drv_flags |= IFF_DRV_RUNNING;
360 	if_link_state_change(ME2IFP(sc), LINK_STATE_UP);
361 	return (0);
362 }
363 
364 static void
365 me_delete_tunnel(struct me_softc *sc)
366 {
367 
368 	sx_assert(&me_ioctl_sx, SA_XLOCKED);
369 	if (ME_READY(sc)) {
370 		CK_LIST_REMOVE(sc, chain);
371 		ME_WAIT();
372 
373 		sc->me_src.s_addr = 0;
374 		sc->me_dst.s_addr = 0;
375 		ME2IFP(sc)->if_drv_flags &= ~IFF_DRV_RUNNING;
376 		if_link_state_change(ME2IFP(sc), LINK_STATE_DOWN);
377 	}
378 }
379 
380 static uint16_t
381 me_in_cksum(uint16_t *p, int nwords)
382 {
383 	uint32_t sum = 0;
384 
385 	while (nwords-- > 0)
386 		sum += *p++;
387 	sum = (sum >> 16) + (sum & 0xffff);
388 	sum += (sum >> 16);
389 	return (~sum);
390 }
391 
392 static int
393 me_input(struct mbuf *m, int off, int proto, void *arg)
394 {
395 	struct me_softc *sc = arg;
396 	struct mobhdr *mh;
397 	struct ifnet *ifp;
398 	struct ip *ip;
399 	int hlen;
400 
401 	ifp = ME2IFP(sc);
402 	/* checks for short packets */
403 	hlen = sizeof(struct mobhdr);
404 	if (m->m_pkthdr.len < sizeof(struct ip) + hlen)
405 		hlen -= sizeof(struct in_addr);
406 	if (m->m_len < sizeof(struct ip) + hlen)
407 		m = m_pullup(m, sizeof(struct ip) + hlen);
408 	if (m == NULL)
409 		goto drop;
410 	mh = (struct mobhdr *)mtodo(m, sizeof(struct ip));
411 	/* check for wrong flags */
412 	if (mh->mob_flags & (~MOB_FLAGS_SP)) {
413 		m_freem(m);
414 		goto drop;
415 	}
416 	if (mh->mob_flags) {
417 	       if (hlen != sizeof(struct mobhdr)) {
418 			m_freem(m);
419 			goto drop;
420 	       }
421 	} else
422 		hlen = sizeof(struct mobhdr) - sizeof(struct in_addr);
423 	/* check mobile header checksum */
424 	if (me_in_cksum((uint16_t *)mh, hlen / sizeof(uint16_t)) != 0) {
425 		m_freem(m);
426 		goto drop;
427 	}
428 #ifdef MAC
429 	mac_ifnet_create_mbuf(ifp, m);
430 #endif
431 	ip = mtod(m, struct ip *);
432 	ip->ip_dst = mh->mob_dst;
433 	ip->ip_p = mh->mob_proto;
434 	ip->ip_sum = 0;
435 	ip->ip_len = htons(m->m_pkthdr.len - hlen);
436 	if (mh->mob_flags)
437 		ip->ip_src = mh->mob_src;
438 	memmove(mtodo(m, hlen), ip, sizeof(struct ip));
439 	m_adj(m, hlen);
440 	m_clrprotoflags(m);
441 	m->m_pkthdr.rcvif = ifp;
442 	m->m_pkthdr.csum_flags |= (CSUM_IP_CHECKED | CSUM_IP_VALID);
443 	M_SETFIB(m, ifp->if_fib);
444 	hlen = AF_INET;
445 	BPF_MTAP2(ifp, &hlen, sizeof(hlen), m);
446 	if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
447 	if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
448 	if ((ifp->if_flags & IFF_MONITOR) != 0)
449 		m_freem(m);
450 	else
451 		netisr_dispatch(NETISR_IP, m);
452 	return (IPPROTO_DONE);
453 drop:
454 	if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
455 	return (IPPROTO_DONE);
456 }
457 
458 static int
459 me_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
460    struct route *ro __unused)
461 {
462 	uint32_t af;
463 
464 	if (dst->sa_family == AF_UNSPEC)
465 		bcopy(dst->sa_data, &af, sizeof(af));
466 	else
467 		af = dst->sa_family;
468 	m->m_pkthdr.csum_data = af;
469 	return (ifp->if_transmit(ifp, m));
470 }
471 
472 #define	MTAG_ME	1414491977
473 static int
474 me_transmit(struct ifnet *ifp, struct mbuf *m)
475 {
476 	struct mobhdr mh;
477 	struct me_softc *sc;
478 	struct ip *ip;
479 	uint32_t af;
480 	int error, hlen, plen;
481 
482 #ifdef MAC
483 	error = mac_ifnet_check_transmit(ifp, m);
484 	if (error != 0)
485 		goto drop;
486 #endif
487 	error = ENETDOWN;
488 	ME_RLOCK();
489 	sc = ifp->if_softc;
490 	if (sc == NULL || !ME_READY(sc) ||
491 	    (ifp->if_flags & IFF_MONITOR) != 0 ||
492 	    (ifp->if_flags & IFF_UP) == 0 ||
493 	    (error = if_tunnel_check_nesting(ifp, m, MTAG_ME,
494 		V_max_me_nesting)) != 0) {
495 		m_freem(m);
496 		goto drop;
497 	}
498 	af = m->m_pkthdr.csum_data;
499 	if (af != AF_INET) {
500 		error = EAFNOSUPPORT;
501 		m_freem(m);
502 		goto drop;
503 	}
504 	if (m->m_len < sizeof(struct ip))
505 		m = m_pullup(m, sizeof(struct ip));
506 	if (m == NULL) {
507 		error = ENOBUFS;
508 		goto drop;
509 	}
510 	ip = mtod(m, struct ip *);
511 	/* Fragmented datagramms shouldn't be encapsulated */
512 	if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
513 		error = EINVAL;
514 		m_freem(m);
515 		goto drop;
516 	}
517 	mh.mob_proto = ip->ip_p;
518 	mh.mob_src = ip->ip_src;
519 	mh.mob_dst = ip->ip_dst;
520 	if (in_hosteq(sc->me_src, ip->ip_src)) {
521 		hlen = sizeof(struct mobhdr) - sizeof(struct in_addr);
522 		mh.mob_flags = 0;
523 	} else {
524 		hlen = sizeof(struct mobhdr);
525 		mh.mob_flags = MOB_FLAGS_SP;
526 	}
527 	BPF_MTAP2(ifp, &af, sizeof(af), m);
528 	plen = m->m_pkthdr.len;
529 	ip->ip_src = sc->me_src;
530 	ip->ip_dst = sc->me_dst;
531 	m->m_flags &= ~(M_BCAST|M_MCAST);
532 	M_SETFIB(m, sc->me_fibnum);
533 	M_PREPEND(m, hlen, M_NOWAIT);
534 	if (m == NULL) {
535 		error = ENOBUFS;
536 		goto drop;
537 	}
538 	if (m->m_len < sizeof(struct ip) + hlen)
539 		m = m_pullup(m, sizeof(struct ip) + hlen);
540 	if (m == NULL) {
541 		error = ENOBUFS;
542 		goto drop;
543 	}
544 	memmove(mtod(m, void *), mtodo(m, hlen), sizeof(struct ip));
545 	ip = mtod(m, struct ip *);
546 	ip->ip_len = htons(m->m_pkthdr.len);
547 	ip->ip_p = IPPROTO_MOBILE;
548 	ip->ip_sum = 0;
549 	mh.mob_csum = 0;
550 	mh.mob_csum = me_in_cksum((uint16_t *)&mh, hlen / sizeof(uint16_t));
551 	bcopy(&mh, mtodo(m, sizeof(struct ip)), hlen);
552 	error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL);
553 drop:
554 	if (error)
555 		if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
556 	else {
557 		if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
558 		if_inc_counter(ifp, IFCOUNTER_OBYTES, plen);
559 	}
560 	ME_RUNLOCK();
561 	return (error);
562 }
563 
564 static void
565 me_qflush(struct ifnet *ifp __unused)
566 {
567 
568 }
569 
570 static const struct encaptab *ecookie = NULL;
571 static const struct encap_config me_encap_cfg = {
572 	.proto = IPPROTO_MOBILE,
573 	.min_length = sizeof(struct ip) + sizeof(struct mobhdr) -
574 	    sizeof(in_addr_t),
575 	.exact_match = ENCAP_DRV_LOOKUP,
576 	.lookup = me_lookup,
577 	.input = me_input
578 };
579 
580 static int
581 memodevent(module_t mod, int type, void *data)
582 {
583 
584 	switch (type) {
585 	case MOD_LOAD:
586 		ecookie = ip_encap_attach(&me_encap_cfg, NULL, M_WAITOK);
587 		break;
588 	case MOD_UNLOAD:
589 		ip_encap_detach(ecookie);
590 		break;
591 	default:
592 		return (EOPNOTSUPP);
593 	}
594 	return (0);
595 }
596 
597 static moduledata_t me_mod = {
598 	"if_me",
599 	memodevent,
600 	0
601 };
602 
603 DECLARE_MODULE(if_me, me_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
604 MODULE_VERSION(if_me, 1);
605