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linux32_socket.c revision 1.11
      1 /*	$NetBSD: linux32_socket.c,v 1.11 2009/11/13 21:45:03 joerg 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 1.11 2009/11/13 21:45:03 joerg 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 
    397 	error = copyin(data, &ifr, sizeof(ifr));
    398 	if (error)
    399 		return error;
    400 
    401 	if (ifr.ifr_ifru.ifru_ifindex >= if_indexlim)
    402 		return ENODEV;
    403 
    404 	ifp = ifindex2ifnet[ifr.ifr_ifru.ifru_ifindex];
    405 	if (ifp == NULL)
    406 		return ENODEV;
    407 
    408 	strncpy(ifr.ifr_name, ifp->if_xname, sizeof(ifr.ifr_name));
    409 
    410 	error = copyout(&ifr, data, sizeof(ifr));
    411 
    412 	return 0;
    413 }
    414 
    415 int
    416 linux32_getifconf(struct lwp *l, register_t *retval, void *data)
    417 {
    418 	struct linux32_ifreq ifr, *ifrp;
    419 	struct netbsd32_ifconf *ifc = data;
    420 	struct ifnet *ifp;
    421 	struct ifaddr *ifa;
    422 	struct sockaddr *sa;
    423 	struct osockaddr *osa;
    424 	int space, error = 0;
    425 	const int sz = (int)sizeof(ifr);
    426 
    427 	ifrp = (struct linux32_ifreq *)NETBSD32PTR64(ifc->ifc_req);
    428 	if (ifrp == NULL)
    429 		space = 0;
    430 	else
    431 		space = ifc->ifc_len;
    432 
    433 	IFNET_FOREACH(ifp) {
    434 		(void)strncpy(ifr.ifr_name, ifp->if_xname,
    435 		    sizeof(ifr.ifr_name));
    436 		if (ifr.ifr_name[sizeof(ifr.ifr_name) - 1] != '\0')
    437 			return ENAMETOOLONG;
    438 		if (IFADDR_EMPTY(ifp))
    439 			continue;
    440 		IFADDR_FOREACH(ifa, ifp) {
    441 			sa = ifa->ifa_addr;
    442 			if (sa->sa_family != AF_INET ||
    443 			    sa->sa_len > sizeof(*osa))
    444 				continue;
    445 			memcpy(&ifr.ifr_addr, sa, sa->sa_len);
    446 			osa = (struct osockaddr *)&ifr.ifr_addr;
    447 			osa->sa_family = sa->sa_family;
    448 			if (space >= sz) {
    449 				error = copyout(&ifr, ifrp, sz);
    450 				if (error != 0)
    451 					return error;
    452 				ifrp++;
    453 			}
    454 			space -= sz;
    455 		}
    456 	}
    457 
    458 	if (ifrp != NULL)
    459 		ifc->ifc_len -= space;
    460 	else
    461 		ifc->ifc_len = -space;
    462 
    463 	return 0;
    464 }
    465 
    466 int
    467 linux32_getifhwaddr(struct lwp *l, register_t *retval, u_int fd,
    468     void *data)
    469 {
    470 	struct linux32_ifreq lreq;
    471 	file_t *fp;
    472 	struct ifaddr *ifa;
    473 	struct ifnet *ifp;
    474 	struct sockaddr_dl *sadl;
    475 	int error, found;
    476 	int index, ifnum;
    477 
    478 	/*
    479 	 * We can't emulate this ioctl by calling sys_ioctl() to run
    480 	 * SIOCGIFCONF, because the user buffer is not of the right
    481 	 * type to take those results.  We can't use kernel buffers to
    482 	 * receive the results, as the implementation of sys_ioctl()
    483 	 * and ifconf() [which implements SIOCGIFCONF] use
    484 	 * copyin()/copyout() which will fail on kernel addresses.
    485 	 *
    486 	 * So, we must duplicate code from sys_ioctl() and ifconf().  Ugh.
    487 	 */
    488 
    489 	if ((fp = fd_getfile(fd)) == NULL)
    490 		return (EBADF);
    491 
    492 	KERNEL_LOCK(1, NULL);
    493 
    494 	if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
    495 		error = EBADF;
    496 		goto out;
    497 	}
    498 
    499 	error = copyin(data, &lreq, sizeof(lreq));
    500 	if (error)
    501 		goto out;
    502 	lreq.ifr_name[LINUX32_IFNAMSIZ-1] = '\0';		/* just in case */
    503 
    504 	/*
    505 	 * Try real interface name first, then fake "ethX"
    506 	 */
    507 	found = 0;
    508 	IFNET_FOREACH(ifp) {
    509 		if (found)
    510 			break;
    511 		if (strcmp(lreq.ifr_name, ifp->if_xname))
    512 			/* not this interface */
    513 			continue;
    514 		found=1;
    515 		if (IFADDR_EMPTY(ifp)) {
    516 			error = ENODEV;
    517 			goto out;
    518 		}
    519 		IFADDR_FOREACH(ifa, ifp) {
    520 			sadl = satosdl(ifa->ifa_addr);
    521 			/* only return ethernet addresses */
    522 			/* XXX what about FDDI, etc. ? */
    523 			if (sadl->sdl_family != AF_LINK ||
    524 			    sadl->sdl_type != IFT_ETHER)
    525 				continue;
    526 			memcpy(&lreq.ifr_hwaddr.sa_data, CLLADDR(sadl),
    527 			       MIN(sadl->sdl_alen,
    528 				   sizeof(lreq.ifr_hwaddr.sa_data)));
    529 			lreq.ifr_hwaddr.sa_family =
    530 				sadl->sdl_family;
    531 			error = copyout(&lreq, data, sizeof(lreq));
    532 			goto out;
    533 		}
    534 	}
    535 
    536 	if (strncmp(lreq.ifr_name, "eth", 3) == 0) {
    537 		for (ifnum = 0, index = 3;
    538 		     lreq.ifr_name[index] != '\0' && index < LINUX32_IFNAMSIZ;
    539 		     index++) {
    540 			ifnum *= 10;
    541 			ifnum += lreq.ifr_name[index] - '0';
    542 		}
    543 
    544 		error = EINVAL;			/* in case we don't find one */
    545 		found = 0;
    546 		IFNET_FOREACH(ifp) {
    547 			if (found)
    548 				break;
    549 			memcpy(lreq.ifr_name, ifp->if_xname,
    550 			       MIN(LINUX32_IFNAMSIZ, IFNAMSIZ));
    551 			IFADDR_FOREACH(ifa, ifp) {
    552 				sadl = satosdl(ifa->ifa_addr);
    553 				/* only return ethernet addresses */
    554 				/* XXX what about FDDI, etc. ? */
    555 				if (sadl->sdl_family != AF_LINK ||
    556 				    sadl->sdl_type != IFT_ETHER)
    557 					continue;
    558 				if (ifnum--)
    559 					/* not the reqested iface */
    560 					continue;
    561 				memcpy(&lreq.ifr_hwaddr.sa_data,
    562 				       CLLADDR(sadl),
    563 				       MIN(sadl->sdl_alen,
    564 					   sizeof(lreq.ifr_hwaddr.sa_data)));
    565 				lreq.ifr_hwaddr.sa_family =
    566 					sadl->sdl_family;
    567 				error = copyout(&lreq, data, sizeof(lreq));
    568 				found = 1;
    569 				break;
    570 			}
    571 		}
    572 	} else {
    573 		/* unknown interface, not even an "eth*" name */
    574 		error = ENODEV;
    575 	}
    576 
    577 out:
    578 	KERNEL_UNLOCK_ONE(NULL);
    579 	fd_putfile(fd);
    580 	return error;
    581 }
    582 
    583 int
    584 linux32_ioctl_socket(struct lwp *l, const struct linux32_sys_ioctl_args *uap, register_t *retval)
    585 {
    586 	/* {
    587 		syscallarg(int) fd;
    588 		syscallarg(u_long) com;
    589 		syscallarg(void *) data;
    590 	} */
    591 	u_long com;
    592 	int error = 0, isdev = 0, dosys = 1;
    593 	struct netbsd32_ioctl_args ia;
    594 	file_t *fp;
    595 	struct vnode *vp;
    596 	int (*ioctlf)(file_t *, u_long, void *);
    597 	struct ioctl_pt pt;
    598 
    599 	if ((fp = fd_getfile(SCARG(uap, fd))) == NULL)
    600 		return (EBADF);
    601 
    602 	if (fp->f_type == DTYPE_VNODE) {
    603 		vp = (struct vnode *)fp->f_data;
    604 		isdev = vp->v_type == VCHR;
    605 	}
    606 
    607 	/*
    608 	 * Don't try to interpret socket ioctl calls that are done
    609 	 * on a device filedescriptor, just pass them through, to
    610 	 * emulate Linux behaviour. Use PTIOCLINUX so that the
    611 	 * device will only handle these if it's prepared to do
    612 	 * so, to avoid unexpected things from happening.
    613 	 */
    614 	if (isdev) {
    615 		dosys = 0;
    616 		ioctlf = fp->f_ops->fo_ioctl;
    617 		pt.com = SCARG(uap, com);
    618 		pt.data = (void *)NETBSD32PTR64(SCARG(uap, data));
    619 		error = ioctlf(fp, PTIOCLINUX, &pt);
    620 		/*
    621 		 * XXX hack: if the function returns EJUSTRETURN,
    622 		 * it has stuffed a sysctl return value in pt.data.
    623 		 */
    624 		if (error == EJUSTRETURN) {
    625 			retval[0] = (register_t)pt.data;
    626 			error = 0;
    627 		}
    628 		goto out;
    629 	}
    630 
    631 	com = SCARG(uap, com);
    632 	retval[0] = 0;
    633 
    634 	switch (com) {
    635 	case LINUX_SIOCGIFNAME:
    636 		error = linux32_getifname(l, retval, SCARG_P32(uap, data));
    637 		dosys = 0;
    638 		break;
    639 	case LINUX_SIOCGIFCONF:
    640 		error = linux32_getifconf(l, retval, SCARG_P32(uap, data));
    641 		dosys = 0;
    642 		break;
    643 	case LINUX_SIOCGIFFLAGS:
    644 		SCARG(&ia, com) = OSIOCGIFFLAGS;
    645 		break;
    646 	case LINUX_SIOCSIFFLAGS:
    647 		SCARG(&ia, com) = OSIOCSIFFLAGS;
    648 		break;
    649 	case LINUX_SIOCGIFADDR:
    650 		SCARG(&ia, com) = OOSIOCGIFADDR;
    651 		break;
    652 	case LINUX_SIOCGIFDSTADDR:
    653 		SCARG(&ia, com) = OOSIOCGIFDSTADDR;
    654 		break;
    655 	case LINUX_SIOCGIFBRDADDR:
    656 		SCARG(&ia, com) = OOSIOCGIFBRDADDR;
    657 		break;
    658 	case LINUX_SIOCGIFNETMASK:
    659 		SCARG(&ia, com) = OOSIOCGIFNETMASK;
    660 		break;
    661 	case LINUX_SIOCADDMULTI:
    662 		SCARG(&ia, com) = OSIOCADDMULTI;
    663 		break;
    664 	case LINUX_SIOCDELMULTI:
    665 		SCARG(&ia, com) = OSIOCDELMULTI;
    666 		break;
    667 	case LINUX_SIOCGIFHWADDR:
    668 		error = linux32_getifhwaddr(l, retval, SCARG(uap, fd),
    669 		    SCARG_P32(uap, data));
    670 		dosys = 0;
    671 		break;
    672 	default:
    673 		error = EINVAL;
    674 	}
    675 
    676  out:
    677  	fd_putfile(SCARG(uap, fd));
    678 
    679 	if (error == 0 && dosys) {
    680 		SCARG(&ia, fd) = SCARG(uap, fd);
    681 		SCARG(&ia, data) = SCARG(uap, data);
    682 		error = netbsd32_ioctl(curlwp, &ia, retval);
    683 	}
    684 
    685 	return error;
    686 }
    687