Home | History | Annotate | Line # | Download | only in common
linux32_socket.c revision 1.23
      1 /*	$NetBSD: linux32_socket.c,v 1.23 2016/06/16 02:38:40 ozaki-r Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2006 Emmanuel Dreyfus, all rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      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  * 3. All advertising materials mentioning features or use of this software
     15  *    must display the following acknowledgement:
     16  *	This product includes software developed by Emmanuel Dreyfus
     17  * 4. The name of the author may not be used to endorse or promote
     18  *    products derived from this software without specific prior written
     19  *    permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE THE AUTHOR AND CONTRIBUTORS ``AS IS''
     22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     23  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     24  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
     25  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     31  * POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 
     36 __KERNEL_RCSID(0, "$NetBSD: linux32_socket.c,v 1.23 2016/06/16 02:38:40 ozaki-r Exp $");
     37 
     38 #include <sys/types.h>
     39 #include <sys/param.h>
     40 #include <sys/fstypes.h>
     41 #include <sys/signal.h>
     42 #include <sys/dirent.h>
     43 #include <sys/kernel.h>
     44 #include <sys/fcntl.h>
     45 #include <sys/select.h>
     46 #include <sys/proc.h>
     47 #include <sys/ucred.h>
     48 #include <sys/swap.h>
     49 #include <sys/file.h>
     50 #include <sys/vnode.h>
     51 #include <sys/filedesc.h>
     52 
     53 #include <machine/types.h>
     54 
     55 #include <net/if.h>
     56 #include <net/if_dl.h>
     57 #include <net/if_types.h>
     58 #include <net/route.h>
     59 
     60 #include <netinet/in.h>
     61 #include <netinet/ip_mroute.h>
     62 
     63 #include <sys/syscallargs.h>
     64 
     65 #include <compat/netbsd32/netbsd32.h>
     66 #include <compat/netbsd32/netbsd32_ioctl.h>
     67 #include <compat/netbsd32/netbsd32_conv.h>
     68 #include <compat/netbsd32/netbsd32_syscallargs.h>
     69 
     70 #include <compat/sys/socket.h>
     71 #include <compat/sys/sockio.h>
     72 
     73 #include <compat/linux/common/linux_types.h>
     74 #include <compat/linux/common/linux_types.h>
     75 #include <compat/linux/common/linux_signal.h>
     76 #include <compat/linux/common/linux_machdep.h>
     77 #include <compat/linux/common/linux_misc.h>
     78 #include <compat/linux/common/linux_oldolduname.h>
     79 #include <compat/linux/common/linux_ioctl.h>
     80 #include <compat/linux/common/linux_sockio.h>
     81 #include <compat/linux/common/linux_ipc.h>
     82 #include <compat/linux/common/linux_sem.h>
     83 #include <compat/linux/linux_syscallargs.h>
     84 
     85 #include <compat/linux32/common/linux32_types.h>
     86 #include <compat/linux32/common/linux32_signal.h>
     87 #include <compat/linux32/common/linux32_machdep.h>
     88 #include <compat/linux32/common/linux32_sysctl.h>
     89 #include <compat/linux32/common/linux32_socketcall.h>
     90 #include <compat/linux32/common/linux32_sockio.h>
     91 #include <compat/linux32/common/linux32_ioctl.h>
     92 #include <compat/linux32/linux32_syscallargs.h>
     93 
     94 int linux32_getifname(struct lwp *, register_t *, void *);
     95 int linux32_getifconf(struct lwp *, register_t *, void *);
     96 int linux32_getifhwaddr(struct lwp *, register_t *, u_int, void *);
     97 
     98 int
     99 linux32_sys_socketpair(struct lwp *l, const struct linux32_sys_socketpair_args *uap, register_t *retval)
    100 {
    101 	/* {
    102 		syscallarg(int) domain;
    103 		syscallarg(int) type;
    104 		syscallarg(int) protocol;
    105 		syscallarg(netbsd32_intp) rsv;
    106 	} */
    107 	struct linux_sys_socketpair_args ua;
    108 
    109 	NETBSD32TO64_UAP(domain);
    110 	NETBSD32TO64_UAP(type);
    111 	NETBSD32TO64_UAP(protocol);
    112 	NETBSD32TOP_UAP(rsv, int);
    113 
    114 	return linux_sys_socketpair(l, &ua, retval);
    115 }
    116 
    117 int
    118 linux32_sys_sendto(struct lwp *l, const struct linux32_sys_sendto_args *uap, register_t *retval)
    119 {
    120 	/* {
    121 		syscallarg(int) s;
    122 		syscallarg(netbsd32_voidp) msg;
    123 		syscallarg(int) len;
    124 		syscallarg(int) flags;
    125 		syscallarg(netbsd32_osockaddrp_t) to;
    126 		syscallarg(int) tolen;
    127 	} */
    128 	struct linux_sys_sendto_args ua;
    129 
    130 	NETBSD32TO64_UAP(s);
    131 	NETBSD32TOP_UAP(msg, void);
    132 	NETBSD32TO64_UAP(len);
    133 	NETBSD32TO64_UAP(flags);
    134 	NETBSD32TOP_UAP(to, struct osockaddr);
    135 	NETBSD32TO64_UAP(tolen);
    136 
    137 	return linux_sys_sendto(l, &ua, retval);
    138 }
    139 
    140 
    141 int
    142 linux32_sys_recvfrom(struct lwp *l, const struct linux32_sys_recvfrom_args *uap, register_t *retval)
    143 {
    144 	/* {
    145 		syscallarg(int) s;
    146 		syscallarg(netbsd32_voidp) buf;
    147 		syscallarg(netbsd32_size_t) len;
    148 		syscallarg(int) flags;
    149 		syscallarg(netbsd32_osockaddrp_t) from;
    150 		syscallarg(netbsd32_intp) fromlenaddr;
    151 	} */
    152 	struct linux_sys_recvfrom_args ua;
    153 
    154 	NETBSD32TO64_UAP(s);
    155 	NETBSD32TOP_UAP(buf, void);
    156 	NETBSD32TO64_UAP(len);
    157 	NETBSD32TO64_UAP(flags);
    158 	NETBSD32TOP_UAP(from, struct osockaddr);
    159 	NETBSD32TOP_UAP(fromlenaddr, unsigned int);
    160 
    161 	return linux_sys_recvfrom(l, &ua, retval);
    162 }
    163 
    164 int
    165 linux32_sys_setsockopt(struct lwp *l, const struct linux32_sys_setsockopt_args *uap, register_t *retval)
    166 {
    167 	/* {
    168 		syscallarg(int) s;
    169 		syscallarg(int) level;
    170 		syscallarg(int) optname;
    171 		syscallarg(netbsd32_voidp) optval;
    172 		syscallarg(int) optlen;
    173 	} */
    174 	struct linux_sys_setsockopt_args ua;
    175 
    176 	NETBSD32TO64_UAP(s);
    177 	NETBSD32TO64_UAP(level);
    178 	NETBSD32TO64_UAP(optname);
    179 	NETBSD32TOP_UAP(optval, void);
    180 	NETBSD32TO64_UAP(optlen);
    181 
    182 	return linux_sys_setsockopt(l, &ua, retval);
    183 }
    184 
    185 
    186 int
    187 linux32_sys_getsockopt(struct lwp *l, const struct linux32_sys_getsockopt_args *uap, register_t *retval)
    188 {
    189 	/* {
    190 		syscallarg(int) s;
    191 		syscallarg(int) level;
    192 		syscallarg(int) optname;
    193 		syscallarg(netbsd32_voidp) optval;
    194 		syscallarg(netbsd32_intp) optlen;
    195 	} */
    196 	struct linux_sys_getsockopt_args ua;
    197 
    198 	NETBSD32TO64_UAP(s);
    199 	NETBSD32TO64_UAP(level);
    200 	NETBSD32TO64_UAP(optname);
    201 	NETBSD32TOP_UAP(optval, void);
    202 	NETBSD32TOP_UAP(optlen, int);
    203 
    204 	return linux_sys_getsockopt(l, &ua, retval);
    205 }
    206 
    207 int
    208 linux32_sys_socket(struct lwp *l, const struct linux32_sys_socket_args *uap, register_t *retval)
    209 {
    210 	/* {
    211 		syscallarg(int) domain;
    212 		syscallarg(int) type;
    213 		syscallarg(int) protocol;
    214 	} */
    215 	struct linux_sys_socket_args ua;
    216 
    217 	NETBSD32TO64_UAP(domain);
    218 	NETBSD32TO64_UAP(type);
    219 	NETBSD32TO64_UAP(protocol);
    220 
    221 	return linux_sys_socket(l, &ua, retval);
    222 }
    223 
    224 int
    225 linux32_sys_bind(struct lwp *l, const struct linux32_sys_bind_args *uap, register_t *retval)
    226 {
    227 	/* {
    228 		syscallarg(int) s;
    229 		syscallarg(netbsd32_osockaddrp_t) name;
    230 		syscallarg(int) namelen;
    231 	} */
    232 	struct linux_sys_bind_args ua;
    233 
    234 	NETBSD32TO64_UAP(s);
    235 	NETBSD32TOP_UAP(name, struct osockaddr);
    236 	NETBSD32TO64_UAP(namelen);
    237 
    238 	return linux_sys_bind(l, &ua, retval);
    239 }
    240 
    241 int
    242 linux32_sys_connect(struct lwp *l, const struct linux32_sys_connect_args *uap, register_t *retval)
    243 {
    244 	/* {
    245 		syscallarg(int) s;
    246 		syscallarg(netbsd32_osockaddrp_t) name;
    247 		syscallarg(int) namelen;
    248 	} */
    249 	struct linux_sys_connect_args ua;
    250 
    251 	NETBSD32TO64_UAP(s);
    252 	NETBSD32TOP_UAP(name, struct osockaddr);
    253 	NETBSD32TO64_UAP(namelen);
    254 
    255 #ifdef DEBUG_LINUX
    256 	printf("linux32_sys_connect: s = %d, name = %p, namelen = %d\n",
    257 		SCARG(&ua, s), SCARG(&ua, name), SCARG(&ua, namelen));
    258 #endif
    259 
    260 	return linux_sys_connect(l, &ua, retval);
    261 }
    262 
    263 int
    264 linux32_sys_accept(struct lwp *l, const struct linux32_sys_accept_args *uap, register_t *retval)
    265 {
    266 	/* {
    267 		syscallarg(int) s;
    268 		syscallarg(netbsd32_osockaddrp_t) name;
    269 		syscallarg(netbsd32_intp) anamelen;
    270 	} */
    271 	struct linux_sys_accept_args ua;
    272 
    273 	NETBSD32TO64_UAP(s);
    274 	NETBSD32TOP_UAP(name, struct osockaddr);
    275 	NETBSD32TOP_UAP(anamelen, int);
    276 
    277 	return linux_sys_accept(l, &ua, retval);
    278 }
    279 
    280 int
    281 linux32_sys_getpeername(struct lwp *l, const struct linux32_sys_getpeername_args *uap, register_t *retval)
    282 {
    283 	/* {
    284 		syscallarg(int) fdes;
    285 		syscallarg(netbsd32_sockaddrp_t) asa;
    286 		syscallarg(netbsd32_intp) alen;
    287 	} */
    288 	struct linux_sys_getpeername_args ua;
    289 
    290 	NETBSD32TO64_UAP(fdes);
    291 	NETBSD32TOP_UAP(asa, struct sockaddr);
    292 	NETBSD32TOP_UAP(alen, int);
    293 
    294 	return linux_sys_getpeername(l, &ua, retval);
    295 }
    296 
    297 int
    298 linux32_sys_getsockname(struct lwp *l, const struct linux32_sys_getsockname_args *uap, register_t *retval)
    299 {
    300 	/* {
    301 		syscallarg(int) fdec;
    302 		syscallarg(netbsd32_charp) asa;
    303 		syscallarg(netbsd32_intp) alen;
    304 	} */
    305 	struct linux_sys_getsockname_args ua;
    306 
    307 	NETBSD32TO64_UAP(fdec);
    308 	NETBSD32TOP_UAP(asa, char);
    309 	NETBSD32TOP_UAP(alen, int);
    310 
    311 	return linux_sys_getsockname(l, &ua, retval);
    312 }
    313 
    314 int
    315 linux32_sys_sendmsg(struct lwp *l, const struct linux32_sys_sendmsg_args *uap, register_t *retval)
    316 {
    317 	/* {
    318 		syscallarg(int) s;
    319 		syscallarg(netbsd32_msghdrp_t) msg;
    320 		syscallarg(int) flags;
    321 	} */
    322 	struct linux_sys_sendmsg_args ua;
    323 
    324 	NETBSD32TO64_UAP(s);
    325 	NETBSD32TOP_UAP(msg, struct msghdr);
    326 	NETBSD32TO64_UAP(flags);
    327 
    328 	return linux_sys_sendmsg(l, &ua, retval);
    329 }
    330 
    331 int
    332 linux32_sys_recvmsg(struct lwp *l, const struct linux32_sys_recvmsg_args *uap, register_t *retval)
    333 {
    334 	/* {
    335 		syscallarg(int) s;
    336 		syscallarg(netbsd32_msghdrp_t) msg;
    337 		syscallarg(int) flags;
    338 	} */
    339 	struct linux_sys_recvmsg_args ua;
    340 
    341 	NETBSD32TO64_UAP(s);
    342 	NETBSD32TOP_UAP(msg, struct msghdr);
    343 	NETBSD32TO64_UAP(flags);
    344 
    345 	return linux_sys_recvmsg(l, &ua, retval);
    346 }
    347 
    348 int
    349 linux32_sys_send(struct lwp *l, const struct linux32_sys_send_args *uap, register_t *retval)
    350 {
    351 	/* {
    352 		syscallarg(int) s;
    353 		syscallarg(netbsd32_voidp) buf;
    354 		syscallarg(int) len;
    355 		syscallarg(int) flags;
    356 	} */
    357 	struct sys_sendto_args ua;
    358 
    359 	NETBSD32TO64_UAP(s);
    360 	NETBSD32TOP_UAP(buf, void);
    361 	NETBSD32TO64_UAP(len);
    362 	NETBSD32TO64_UAP(flags);
    363 	SCARG(&ua, to) = NULL;
    364 	SCARG(&ua, tolen) = 0;
    365 
    366 	return sys_sendto(l, &ua, retval);
    367 }
    368 
    369 int
    370 linux32_sys_recv(struct lwp *l, const struct linux32_sys_recv_args *uap, register_t *retval)
    371 {
    372 	/* {
    373 		syscallarg(int) s;
    374 		syscallarg(netbsd32_voidp) buf;
    375 		syscallarg(int) len;
    376 		syscallarg(int) flags;
    377 	} */
    378 	struct sys_recvfrom_args ua;
    379 
    380 	NETBSD32TO64_UAP(s);
    381 	NETBSD32TOP_UAP(buf, void);
    382 	NETBSD32TO64_UAP(len);
    383 	NETBSD32TO64_UAP(flags);
    384 	SCARG(&ua, from) = NULL;
    385 	SCARG(&ua, fromlenaddr) = NULL;
    386 
    387 	return sys_recvfrom(l, &ua, retval);
    388 }
    389 
    390 int
    391 linux32_getifname(struct lwp *l, register_t *retval, void *data)
    392 {
    393 	struct ifnet *ifp;
    394 	struct linux32_ifreq ifr;
    395 	int error;
    396 	int s;
    397 
    398 	error = copyin(data, &ifr, sizeof(ifr));
    399 	if (error)
    400 		return error;
    401 
    402 	s = pserialize_read_enter();
    403 	ifp = if_byindex(ifr.ifr_ifru.ifru_ifindex);
    404 	if (ifp == NULL) {
    405 		pserialize_read_exit(s);
    406 		return ENODEV;
    407 	}
    408 
    409 	strncpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name));
    410 	pserialize_read_exit(s);
    411 
    412 	return copyout(&ifr, data, sizeof(ifr));
    413 }
    414 
    415 int
    416 linux32_getifconf(struct lwp *l, register_t *retval, void *data)
    417 {
    418 	struct linux32_ifreq ifr, *ifrp = NULL;
    419 	struct linux32_ifconf ifc;
    420 	struct ifnet *ifp;
    421 	struct ifaddr *ifa;
    422 	struct sockaddr *sa;
    423 	struct osockaddr *osa;
    424 	int space = 0, error;
    425 	const int sz = (int)sizeof(ifr);
    426 	bool docopy;
    427 	int s;
    428 	int bound;
    429 	struct psref psref;
    430 
    431 	error = copyin(data, &ifc, sizeof(ifc));
    432 	if (error)
    433 		return error;
    434 
    435 	docopy = NETBSD32PTR64(ifc.ifc_req) != NULL;
    436 	if (docopy) {
    437 		space = ifc.ifc_len;
    438 		ifrp = NETBSD32PTR64(ifc.ifc_req);
    439 	}
    440 
    441 	bound = curlwp_bind();
    442 	s = pserialize_read_enter();
    443 	IFNET_READER_FOREACH(ifp) {
    444 		psref_acquire(&psref, &ifp->if_psref, ifnet_psref_class);
    445 		pserialize_read_exit(s);
    446 
    447 		(void)strncpy(ifr.ifr_name, ifp->if_xname,
    448 		    sizeof(ifr.ifr_name));
    449 		if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0') {
    450 			error = ENAMETOOLONG;
    451 			goto release_exit;
    452 		}
    453 		if (IFADDR_EMPTY(ifp))
    454 			continue;
    455 		IFADDR_FOREACH(ifa, ifp) {
    456 			sa = ifa->ifa_addr;
    457 			if (sa->sa_family != AF_INET ||
    458 			    sa->sa_len > sizeof(*osa))
    459 				continue;
    460 			memcpy(&ifr.ifr_addr, sa, sa->sa_len);
    461 			osa = (struct osockaddr *)&ifr.ifr_addr;
    462 			osa->sa_family = sa->sa_family;
    463 			if (space >= sz) {
    464 				error = copyout(&ifr, ifrp, sz);
    465 				if (error != 0)
    466 					goto release_exit;
    467 				ifrp++;
    468 			}
    469 			space -= sz;
    470 		}
    471 
    472 		s = pserialize_read_enter();
    473 		psref_release(&psref, &ifp->if_psref, ifnet_psref_class);
    474 	}
    475 	pserialize_read_exit(s);
    476 	curlwp_bindx(bound);
    477 
    478 	if (docopy)
    479 		ifc.ifc_len -= space;
    480 	else
    481 		ifc.ifc_len = -space;
    482 
    483 	return copyout(&ifc, data, sizeof(ifc));
    484 
    485 release_exit:
    486 	psref_release(&psref, &ifp->if_psref, ifnet_psref_class);
    487 	curlwp_bindx(bound);
    488 	return error;
    489 }
    490 
    491 int
    492 linux32_getifhwaddr(struct lwp *l, register_t *retval, u_int fd,
    493     void *data)
    494 {
    495 	struct linux32_ifreq lreq;
    496 	file_t *fp;
    497 	struct ifaddr *ifa;
    498 	struct ifnet *ifp;
    499 	struct sockaddr_dl *sadl;
    500 	int error, found;
    501 	int index, ifnum;
    502 	int s;
    503 
    504 	/*
    505 	 * We can't emulate this ioctl by calling sys_ioctl() to run
    506 	 * SIOCGIFCONF, because the user buffer is not of the right
    507 	 * type to take those results.  We can't use kernel buffers to
    508 	 * receive the results, as the implementation of sys_ioctl()
    509 	 * and ifconf() [which implements SIOCGIFCONF] use
    510 	 * copyin()/copyout() which will fail on kernel addresses.
    511 	 *
    512 	 * So, we must duplicate code from sys_ioctl() and ifconf().  Ugh.
    513 	 */
    514 
    515 	if ((fp = fd_getfile(fd)) == NULL)
    516 		return (EBADF);
    517 
    518 	KERNEL_LOCK(1, NULL);
    519 
    520 	if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
    521 		error = EBADF;
    522 		goto out;
    523 	}
    524 
    525 	error = copyin(data, &lreq, sizeof(lreq));
    526 	if (error)
    527 		goto out;
    528 	lreq.ifr_name[LINUX32_IFNAMSIZ-1] = '\0';		/* just in case */
    529 
    530 	/*
    531 	 * Try real interface name first, then fake "ethX"
    532 	 */
    533 	found = 0;
    534 	s = pserialize_read_enter();
    535 	IFNET_READER_FOREACH(ifp) {
    536 		if (found)
    537 			break;
    538 		if (strcmp(lreq.ifr_name, ifp->if_xname))
    539 			/* not this interface */
    540 			continue;
    541 		found=1;
    542 		if (IFADDR_EMPTY(ifp)) {
    543 			error = ENODEV;
    544 			goto out;
    545 		}
    546 		IFADDR_FOREACH(ifa, ifp) {
    547 			sadl = satosdl(ifa->ifa_addr);
    548 			/* only return ethernet addresses */
    549 			/* XXX what about FDDI, etc. ? */
    550 			if (sadl->sdl_family != AF_LINK ||
    551 			    sadl->sdl_type != IFT_ETHER)
    552 				continue;
    553 			memcpy(&lreq.ifr_hwaddr.sa_data, CLLADDR(sadl),
    554 			       MIN(sadl->sdl_alen,
    555 				   sizeof(lreq.ifr_hwaddr.sa_data)));
    556 			lreq.ifr_hwaddr.sa_family =
    557 				sadl->sdl_family;
    558 			pserialize_read_exit(s);
    559 
    560 			error = copyout(&lreq, data, sizeof(lreq));
    561 			goto out;
    562 		}
    563 	}
    564 	pserialize_read_exit(s);
    565 
    566 	if (strncmp(lreq.ifr_name, "eth", 3) == 0) {
    567 		for (ifnum = 0, index = 3;
    568 		     index < LINUX32_IFNAMSIZ && lreq.ifr_name[index] != '\0';
    569 		     index++) {
    570 			ifnum *= 10;
    571 			ifnum += lreq.ifr_name[index] - '0';
    572 		}
    573 
    574 		error = EINVAL;			/* in case we don't find one */
    575 		s = pserialize_read_enter();
    576 		IFNET_READER_FOREACH(ifp) {
    577 			memcpy(lreq.ifr_name, ifp->if_xname,
    578 			       MIN(LINUX32_IFNAMSIZ, IFNAMSIZ));
    579 			IFADDR_FOREACH(ifa, ifp) {
    580 				sadl = satosdl(ifa->ifa_addr);
    581 				/* only return ethernet addresses */
    582 				/* XXX what about FDDI, etc. ? */
    583 				if (sadl->sdl_family != AF_LINK ||
    584 				    sadl->sdl_type != IFT_ETHER)
    585 					continue;
    586 				if (ifnum--)
    587 					/* not the reqested iface */
    588 					continue;
    589 				memcpy(&lreq.ifr_hwaddr.sa_data,
    590 				       CLLADDR(sadl),
    591 				       MIN(sadl->sdl_alen,
    592 					   sizeof(lreq.ifr_hwaddr.sa_data)));
    593 				lreq.ifr_hwaddr.sa_family =
    594 					sadl->sdl_family;
    595 				pserialize_read_exit(s);
    596 
    597 				error = copyout(&lreq, data, sizeof(lreq));
    598 				goto out;
    599 			}
    600 		}
    601 		pserialize_read_exit(s);
    602 	} else {
    603 		/* unknown interface, not even an "eth*" name */
    604 		error = ENODEV;
    605 	}
    606 
    607 out:
    608 	KERNEL_UNLOCK_ONE(NULL);
    609 	fd_putfile(fd);
    610 	return error;
    611 }
    612 
    613 int
    614 linux32_ioctl_socket(struct lwp *l, const struct linux32_sys_ioctl_args *uap, register_t *retval)
    615 {
    616 	/* {
    617 		syscallarg(int) fd;
    618 		syscallarg(u_long) com;
    619 		syscallarg(void *) data;
    620 	} */
    621 	u_long com;
    622 	int error = 0, isdev = 0, dosys = 1;
    623 	struct netbsd32_ioctl_args ia;
    624 	file_t *fp;
    625 	struct vnode *vp;
    626 	int (*ioctlf)(file_t *, u_long, void *);
    627 	struct ioctl_pt pt;
    628 
    629 	if ((fp = fd_getfile(SCARG(uap, fd))) == NULL)
    630 		return (EBADF);
    631 
    632 	if (fp->f_type == DTYPE_VNODE) {
    633 		vp = (struct vnode *)fp->f_data;
    634 		isdev = vp->v_type == VCHR;
    635 	}
    636 
    637 	/*
    638 	 * Don't try to interpret socket ioctl calls that are done
    639 	 * on a device filedescriptor, just pass them through, to
    640 	 * emulate Linux behaviour. Use PTIOCLINUX so that the
    641 	 * device will only handle these if it's prepared to do
    642 	 * so, to avoid unexpected things from happening.
    643 	 */
    644 	if (isdev) {
    645 		dosys = 0;
    646 		ioctlf = fp->f_ops->fo_ioctl;
    647 		pt.com = SCARG(uap, com);
    648 		pt.data = (void *)NETBSD32PTR64(SCARG(uap, data));
    649 		error = ioctlf(fp, PTIOCLINUX, &pt);
    650 		/*
    651 		 * XXX hack: if the function returns EJUSTRETURN,
    652 		 * it has stuffed a sysctl return value in pt.data.
    653 		 */
    654 		if (error == EJUSTRETURN) {
    655 			retval[0] = (register_t)pt.data;
    656 			error = 0;
    657 		}
    658 		goto out;
    659 	}
    660 
    661 	com = SCARG(uap, com);
    662 	retval[0] = 0;
    663 
    664 	switch (com) {
    665 	case LINUX_SIOCGIFNAME:
    666 		error = linux32_getifname(l, retval, SCARG_P32(uap, data));
    667 		dosys = 0;
    668 		break;
    669 	case LINUX_SIOCGIFCONF:
    670 		error = linux32_getifconf(l, retval, SCARG_P32(uap, data));
    671 		dosys = 0;
    672 		break;
    673 	case LINUX_SIOCGIFFLAGS:
    674 		SCARG(&ia, com) = OSIOCGIFFLAGS32;
    675 		break;
    676 	case LINUX_SIOCSIFFLAGS:
    677 		SCARG(&ia, com) = OSIOCSIFFLAGS32;
    678 		break;
    679 	case LINUX_SIOCGIFADDR:
    680 		SCARG(&ia, com) = OOSIOCGIFADDR32;
    681 		break;
    682 	case LINUX_SIOCGIFDSTADDR:
    683 		SCARG(&ia, com) = OOSIOCGIFDSTADDR32;
    684 		break;
    685 	case LINUX_SIOCGIFBRDADDR:
    686 		SCARG(&ia, com) = OOSIOCGIFBRDADDR32;
    687 		break;
    688 	case LINUX_SIOCGIFNETMASK:
    689 		SCARG(&ia, com) = OOSIOCGIFNETMASK32;
    690 		break;
    691 	case LINUX_SIOCGIFMTU:
    692 		SCARG(&ia, com) = OSIOCGIFMTU32;
    693 		break;
    694 	case LINUX_SIOCADDMULTI:
    695 		SCARG(&ia, com) = OSIOCADDMULTI32;
    696 		break;
    697 	case LINUX_SIOCDELMULTI:
    698 		SCARG(&ia, com) = OSIOCDELMULTI32;
    699 		break;
    700 	case LINUX_SIOCGIFHWADDR:
    701 		error = linux32_getifhwaddr(l, retval, SCARG(uap, fd),
    702 		    SCARG_P32(uap, data));
    703 		dosys = 0;
    704 		break;
    705 	default:
    706 		error = EINVAL;
    707 	}
    708 
    709  out:
    710  	fd_putfile(SCARG(uap, fd));
    711 
    712 	if (error == 0 && dosys) {
    713 		SCARG(&ia, fd) = SCARG(uap, fd);
    714 		SCARG(&ia, data) = SCARG(uap, data);
    715 		error = netbsd32_ioctl(curlwp, &ia, retval);
    716 	}
    717 
    718 	return error;
    719 }
    720