Home | History | Annotate | Line # | Download | only in netinet
      1 /*	$NetBSD: in.c,v 1.248 2024/08/20 08:22:35 ozaki-r Exp $	*/
      2 
      3 /*
      4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the project nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 /*-
     33  * Copyright (c) 1998 The NetBSD Foundation, Inc.
     34  * All rights reserved.
     35  *
     36  * This code is derived from software contributed to The NetBSD Foundation
     37  * by Public Access Networks Corporation ("Panix").  It was developed under
     38  * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
     39  *
     40  * Redistribution and use in source and binary forms, with or without
     41  * modification, are permitted provided that the following conditions
     42  * are met:
     43  * 1. Redistributions of source code must retain the above copyright
     44  *    notice, this list of conditions and the following disclaimer.
     45  * 2. Redistributions in binary form must reproduce the above copyright
     46  *    notice, this list of conditions and the following disclaimer in the
     47  *    documentation and/or other materials provided with the distribution.
     48  *
     49  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     50  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     51  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     52  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     53  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     54  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     55  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     56  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     57  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     58  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     59  * POSSIBILITY OF SUCH DAMAGE.
     60  */
     61 
     62 /*
     63  * Copyright (c) 1982, 1986, 1991, 1993
     64  *	The Regents of the University of California.  All rights reserved.
     65  *
     66  * Redistribution and use in source and binary forms, with or without
     67  * modification, are permitted provided that the following conditions
     68  * are met:
     69  * 1. Redistributions of source code must retain the above copyright
     70  *    notice, this list of conditions and the following disclaimer.
     71  * 2. Redistributions in binary form must reproduce the above copyright
     72  *    notice, this list of conditions and the following disclaimer in the
     73  *    documentation and/or other materials provided with the distribution.
     74  * 3. Neither the name of the University nor the names of its contributors
     75  *    may be used to endorse or promote products derived from this software
     76  *    without specific prior written permission.
     77  *
     78  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     79  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     80  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     81  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     82  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     83  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     84  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     85  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     86  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     87  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     88  * SUCH DAMAGE.
     89  *
     90  *	@(#)in.c	8.4 (Berkeley) 1/9/95
     91  */
     92 
     93 #include <sys/cdefs.h>
     94 __KERNEL_RCSID(0, "$NetBSD: in.c,v 1.248 2024/08/20 08:22:35 ozaki-r Exp $");
     95 
     96 #include "arp.h"
     97 
     98 #ifdef _KERNEL_OPT
     99 #include "opt_inet.h"
    100 #include "opt_inet_conf.h"
    101 #include "opt_mrouting.h"
    102 #include "opt_net_mpsafe.h"
    103 #endif
    104 
    105 #include <sys/param.h>
    106 #include <sys/ioctl.h>
    107 #include <sys/errno.h>
    108 #include <sys/kernel.h>
    109 #include <sys/malloc.h>
    110 #include <sys/socket.h>
    111 #include <sys/socketvar.h>
    112 #include <sys/sysctl.h>
    113 #include <sys/systm.h>
    114 #include <sys/proc.h>
    115 #include <sys/syslog.h>
    116 #include <sys/kauth.h>
    117 #include <sys/kmem.h>
    118 
    119 #include <sys/cprng.h>
    120 
    121 #include <net/if.h>
    122 #include <net/route.h>
    123 #include <net/pfil.h>
    124 
    125 #include <net/if_arp.h>
    126 #include <net/if_ether.h>
    127 #include <net/if_types.h>
    128 #include <net/if_llatbl.h>
    129 #include <net/if_dl.h>
    130 
    131 #include <netinet/in_systm.h>
    132 #include <netinet/in.h>
    133 #include <netinet/in_var.h>
    134 #include <netinet/ip.h>
    135 #include <netinet/ip_var.h>
    136 #include <netinet/in_ifattach.h>
    137 #include <netinet/in_pcb.h>
    138 #include <netinet/in_selsrc.h>
    139 #include <netinet/if_inarp.h>
    140 #include <netinet/ip_mroute.h>
    141 #include <netinet/igmp_var.h>
    142 
    143 #ifdef IPSELSRC
    144 #include <netinet/in_selsrc.h>
    145 #endif
    146 
    147 static u_int	in_mask2len(struct in_addr *);
    148 static int	in_lifaddr_ioctl(struct socket *, u_long, void *,
    149 	struct ifnet *);
    150 
    151 static void	in_addrhash_insert_locked(struct in_ifaddr *);
    152 static void	in_addrhash_remove_locked(struct in_ifaddr *);
    153 
    154 static int	in_addprefix(struct in_ifaddr *, int);
    155 static void	in_scrubaddr(struct in_ifaddr *);
    156 static int	in_scrubprefix(struct in_ifaddr *);
    157 static void	in_sysctl_init(struct sysctllog **);
    158 
    159 #ifndef SUBNETSARELOCAL
    160 #define	SUBNETSARELOCAL	1
    161 #endif
    162 
    163 #ifndef HOSTZEROBROADCAST
    164 #define HOSTZEROBROADCAST 0
    165 #endif
    166 
    167 /* Note: 61, 127, 251, 509, 1021, 2039 are good. */
    168 #ifndef IN_MULTI_HASH_SIZE
    169 #define IN_MULTI_HASH_SIZE	509
    170 #endif
    171 
    172 static int			subnetsarelocal = SUBNETSARELOCAL;
    173 static int			hostzeroisbroadcast = HOSTZEROBROADCAST;
    174 
    175 /*
    176  * This list is used to keep track of in_multi chains which belong to
    177  * deleted interface addresses.  We use in_ifaddr so that a chain head
    178  * won't be deallocated until all multicast address record are deleted.
    179  */
    180 
    181 LIST_HEAD(in_multihashhead, in_multi);		/* Type of the hash head */
    182 
    183 static struct pool		inmulti_pool;
    184 static u_int			in_multientries;
    185 static struct in_multihashhead *in_multihashtbl;
    186 static u_long			in_multihash;
    187 static krwlock_t		in_multilock;
    188 
    189 #define IN_MULTI_HASH(x, ifp) \
    190     (in_multihashtbl[(u_long)((x) ^ (ifp->if_index)) % IN_MULTI_HASH_SIZE])
    191 
    192 /* XXX DEPRECATED. Keep them to avoid breaking kvm(3) users. */
    193 struct in_ifaddrhashhead *	in_ifaddrhashtbl;
    194 u_long				in_ifaddrhash;
    195 struct in_ifaddrhead		in_ifaddrhead;
    196 static kmutex_t			in_ifaddr_lock;
    197 
    198 pserialize_t			in_ifaddrhash_psz;
    199 struct pslist_head *		in_ifaddrhashtbl_pslist;
    200 u_long				in_ifaddrhash_pslist;
    201 struct pslist_head		in_ifaddrhead_pslist;
    202 
    203 void
    204 in_init(void)
    205 {
    206 	pool_init(&inmulti_pool, sizeof(struct in_multi), 0, 0, 0, "inmltpl",
    207 	    NULL, IPL_SOFTNET);
    208 	TAILQ_INIT(&in_ifaddrhead);
    209 	PSLIST_INIT(&in_ifaddrhead_pslist);
    210 
    211 	in_ifaddrhashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
    212 	    &in_ifaddrhash);
    213 
    214 	in_ifaddrhash_psz = pserialize_create();
    215 	in_ifaddrhashtbl_pslist = hashinit(IN_IFADDR_HASH_SIZE, HASH_PSLIST,
    216 	    true, &in_ifaddrhash_pslist);
    217 	mutex_init(&in_ifaddr_lock, MUTEX_DEFAULT, IPL_NONE);
    218 
    219 	in_multihashtbl = hashinit(IN_IFADDR_HASH_SIZE, HASH_LIST, true,
    220 	    &in_multihash);
    221 	rw_init(&in_multilock);
    222 
    223 	in_sysctl_init(NULL);
    224 }
    225 
    226 /*
    227  * Return 1 if an internet address is for a ``local'' host
    228  * (one to which we have a connection).  If subnetsarelocal
    229  * is true, this includes other subnets of the local net.
    230  * Otherwise, it includes only the directly-connected (sub)nets.
    231  */
    232 int
    233 in_localaddr(struct in_addr in)
    234 {
    235 	struct in_ifaddr *ia;
    236 	int localaddr = 0;
    237 	int s = pserialize_read_enter();
    238 
    239 	if (subnetsarelocal) {
    240 		IN_ADDRLIST_READER_FOREACH(ia) {
    241 			if ((in.s_addr & ia->ia_netmask) == ia->ia_net) {
    242 				localaddr = 1;
    243 				break;
    244 			}
    245 		}
    246 	} else {
    247 		IN_ADDRLIST_READER_FOREACH(ia) {
    248 			if ((in.s_addr & ia->ia_subnetmask) == ia->ia_subnet) {
    249 				localaddr = 1;
    250 				break;
    251 			}
    252 		}
    253 	}
    254 	pserialize_read_exit(s);
    255 
    256 	return localaddr;
    257 }
    258 
    259 /*
    260  * like in_localaddr() but can specify ifp.
    261  */
    262 int
    263 in_direct(struct in_addr in, struct ifnet *ifp)
    264 {
    265 	struct ifaddr *ifa;
    266 	int localaddr = 0;
    267 	int s;
    268 
    269 	KASSERT(ifp != NULL);
    270 
    271 #define ia (ifatoia(ifa))
    272 	s = pserialize_read_enter();
    273 	if (subnetsarelocal) {
    274 		IFADDR_READER_FOREACH(ifa, ifp) {
    275 			if (ifa->ifa_addr->sa_family == AF_INET &&
    276 			    ((in.s_addr & ia->ia_netmask) == ia->ia_net)) {
    277 				localaddr = 1;
    278 				break;
    279 			}
    280 		}
    281 	} else {
    282 		IFADDR_READER_FOREACH(ifa, ifp) {
    283 			if (ifa->ifa_addr->sa_family == AF_INET &&
    284 			    (in.s_addr & ia->ia_subnetmask) == ia->ia_subnet) {
    285 				localaddr = 1;
    286 				break;
    287 			}
    288 		}
    289 	}
    290 	pserialize_read_exit(s);
    291 
    292 	return localaddr;
    293 #undef ia
    294 }
    295 
    296 /*
    297  * Determine whether an IP address is in a reserved set of addresses
    298  * that may not be forwarded, or whether datagrams to that destination
    299  * may be forwarded.
    300  */
    301 int
    302 in_canforward(struct in_addr in)
    303 {
    304 	u_int32_t net;
    305 
    306 	if (IN_EXPERIMENTAL(in.s_addr) || IN_MULTICAST(in.s_addr))
    307 		return (0);
    308 	if (IN_CLASSA(in.s_addr)) {
    309 		net = in.s_addr & IN_CLASSA_NET;
    310 		if (net == 0 || net == htonl(IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
    311 			return (0);
    312 	}
    313 	return (1);
    314 }
    315 
    316 /*
    317  * Trim a mask in a sockaddr
    318  */
    319 void
    320 in_socktrim(struct sockaddr_in *ap)
    321 {
    322 	char *cplim = (char *) &ap->sin_addr;
    323 	char *cp = (char *) (&ap->sin_addr + 1);
    324 
    325 	ap->sin_len = 0;
    326 	while (--cp >= cplim)
    327 		if (*cp) {
    328 			(ap)->sin_len = cp - (char *) (ap) + 1;
    329 			break;
    330 		}
    331 }
    332 
    333 /*
    334  * Maintain the "in_maxmtu" variable, which is the largest
    335  * mtu for non-local interfaces with AF_INET addresses assigned
    336  * to them that are up.
    337  */
    338 unsigned long in_maxmtu;
    339 
    340 void
    341 in_setmaxmtu(void)
    342 {
    343 	struct in_ifaddr *ia;
    344 	struct ifnet *ifp;
    345 	unsigned long maxmtu = 0;
    346 	int s = pserialize_read_enter();
    347 
    348 	IN_ADDRLIST_READER_FOREACH(ia) {
    349 		if ((ifp = ia->ia_ifp) == 0)
    350 			continue;
    351 		if ((ifp->if_flags & (IFF_UP|IFF_LOOPBACK)) != IFF_UP)
    352 			continue;
    353 		if (ifp->if_mtu > maxmtu)
    354 			maxmtu = ifp->if_mtu;
    355 	}
    356 	if (maxmtu)
    357 		in_maxmtu = maxmtu;
    358 	pserialize_read_exit(s);
    359 }
    360 
    361 static u_int
    362 in_mask2len(struct in_addr *mask)
    363 {
    364 	u_int x, y;
    365 	u_char *p;
    366 
    367 	p = (u_char *)mask;
    368 	for (x = 0; x < sizeof(*mask); x++) {
    369 		if (p[x] != 0xff)
    370 			break;
    371 	}
    372 	y = 0;
    373 	if (x < sizeof(*mask)) {
    374 		for (y = 0; y < NBBY; y++) {
    375 			if ((p[x] & (0x80 >> y)) == 0)
    376 				break;
    377 		}
    378 	}
    379 	return x * NBBY + y;
    380 }
    381 
    382 void
    383 in_len2mask(struct in_addr *mask, u_int len)
    384 {
    385 	u_int i;
    386 	u_char *p;
    387 
    388 	p = (u_char *)mask;
    389 	memset(mask, 0, sizeof(*mask));
    390 	for (i = 0; i < len / NBBY; i++)
    391 		p[i] = 0xff;
    392 	if (len % NBBY)
    393 		p[i] = (0xff00 >> (len % NBBY)) & 0xff;
    394 }
    395 
    396 /*
    397  * Generic internet control operations (ioctl's).
    398  * Ifp is 0 if not an interface-specific ioctl.
    399  */
    400 /* ARGSUSED */
    401 static int
    402 in_control0(struct socket *so, u_long cmd, void *data, struct ifnet *ifp)
    403 {
    404 	struct ifreq *ifr = (struct ifreq *)data;
    405 	struct in_ifaddr *ia = NULL;
    406 	struct in_aliasreq *ifra = (struct in_aliasreq *)data;
    407 	struct sockaddr_in oldaddr, *new_dstaddr;
    408 	int error, hostIsNew, maskIsNew;
    409 	int newifaddr = 0;
    410 	bool run_hook = false;
    411 	bool need_reinsert = false;
    412 	struct psref psref;
    413 	int bound;
    414 
    415 	switch (cmd) {
    416 	case SIOCALIFADDR:
    417 	case SIOCDLIFADDR:
    418 	case SIOCGLIFADDR:
    419 		if (ifp == NULL)
    420 			return EINVAL;
    421 		return in_lifaddr_ioctl(so, cmd, data, ifp);
    422 	case SIOCGIFADDRPREF:
    423 	case SIOCSIFADDRPREF:
    424 		if (ifp == NULL)
    425 			return EINVAL;
    426 		return ifaddrpref_ioctl(so, cmd, data, ifp);
    427 #if NARP > 0
    428 	case SIOCGNBRINFO:
    429 	{
    430 		struct in_nbrinfo *nbi = (struct in_nbrinfo *)data;
    431 		struct llentry *ln;
    432 		struct in_addr nb_addr = nbi->addr; /* make local for safety */
    433 
    434 		ln = arplookup(ifp, &nb_addr, NULL, 0);
    435 		if (ln == NULL)
    436 			return EINVAL;
    437 		nbi->state = ln->ln_state;
    438 		nbi->asked = ln->ln_asked;
    439 		nbi->expire = ln->ln_expire ?
    440 		    time_mono_to_wall(ln->ln_expire) : 0;
    441 		LLE_RUNLOCK(ln);
    442 		return 0;
    443 	}
    444 #endif
    445 	}
    446 
    447 	bound = curlwp_bind();
    448 	/*
    449 	 * Find address for this interface, if it exists.
    450 	 */
    451 	if (ifp != NULL)
    452 		ia = in_get_ia_from_ifp_psref(ifp, &psref);
    453 
    454 	hostIsNew = 1;		/* moved here to appease gcc */
    455 	switch (cmd) {
    456 	case SIOCAIFADDR:
    457 	case SIOCDIFADDR:
    458 	case SIOCGIFALIAS:
    459 	case SIOCGIFAFLAG_IN:
    460 		if (ifra->ifra_addr.sin_family == AF_INET) {
    461 			int s;
    462 
    463 			if (ia != NULL)
    464 				ia4_release(ia, &psref);
    465 			s = pserialize_read_enter();
    466 			IN_ADDRHASH_READER_FOREACH(ia,
    467 			    ifra->ifra_addr.sin_addr.s_addr) {
    468 				if (ia->ia_ifp == ifp &&
    469 				    in_hosteq(ia->ia_addr.sin_addr,
    470 				    ifra->ifra_addr.sin_addr))
    471 					break;
    472 			}
    473 			if (ia != NULL)
    474 				ia4_acquire(ia, &psref);
    475 			pserialize_read_exit(s);
    476 		}
    477 		if ((cmd == SIOCDIFADDR ||
    478 		    cmd == SIOCGIFALIAS ||
    479 		    cmd == SIOCGIFAFLAG_IN) &&
    480 		    ia == NULL) {
    481 			error = EADDRNOTAVAIL;
    482 			goto out;
    483 		}
    484 
    485 		if (cmd == SIOCDIFADDR &&
    486 		    ifra->ifra_addr.sin_family == AF_UNSPEC) {
    487 			ifra->ifra_addr.sin_family = AF_INET;
    488 		}
    489 		/* FALLTHROUGH */
    490 	case SIOCSIFADDR:
    491 		if (ia == NULL || ia->ia_addr.sin_family != AF_INET)
    492 			;
    493 		else if (ifra->ifra_addr.sin_len == 0) {
    494 			ifra->ifra_addr = ia->ia_addr;
    495 			hostIsNew = 0;
    496 		} else if (in_hosteq(ia->ia_addr.sin_addr,
    497 		           ifra->ifra_addr.sin_addr))
    498 			hostIsNew = 0;
    499 		if (ifra->ifra_addr.sin_family != AF_INET) {
    500 			error = EAFNOSUPPORT;
    501 			goto out;
    502 		}
    503 		/* FALLTHROUGH */
    504 	case SIOCSIFDSTADDR:
    505 		if (cmd == SIOCSIFDSTADDR &&
    506 		    ifreq_getaddr(cmd, ifr)->sa_family != AF_INET) {
    507 			error = EAFNOSUPPORT;
    508 			goto out;
    509 		}
    510 		/* FALLTHROUGH */
    511 	case SIOCSIFNETMASK:
    512 		if (ifp == NULL)
    513 			panic("in_control");
    514 
    515 		if (cmd == SIOCGIFALIAS || cmd == SIOCGIFAFLAG_IN)
    516 			break;
    517 
    518 		if (ia == NULL &&
    519 		    (cmd == SIOCSIFNETMASK || cmd == SIOCSIFDSTADDR)) {
    520 			error = EADDRNOTAVAIL;
    521 			goto out;
    522 		}
    523 
    524 		if (kauth_authorize_network(kauth_cred_get(),
    525 		    KAUTH_NETWORK_INTERFACE,
    526 		    KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
    527 		    NULL) != 0) {
    528 			error = EPERM;
    529 			goto out;
    530 		}
    531 
    532 		if (ia == NULL) {
    533 			ia = malloc(sizeof(*ia), M_IFADDR, M_WAITOK|M_ZERO);
    534 			if (ia == NULL) {
    535 				error = ENOBUFS;
    536 				goto out;
    537 			}
    538 			ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr);
    539 			ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
    540 			ia->ia_ifa.ifa_netmask = sintosa(&ia->ia_sockmask);
    541 #ifdef IPSELSRC
    542 			ia->ia_ifa.ifa_getifa = in_getifa;
    543 #else /* IPSELSRC */
    544 			ia->ia_ifa.ifa_getifa = NULL;
    545 #endif /* IPSELSRC */
    546 			ia->ia_sockmask.sin_len = 8;
    547 			ia->ia_sockmask.sin_family = AF_INET;
    548 			if (ifp->if_flags & IFF_BROADCAST) {
    549 				ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
    550 				ia->ia_broadaddr.sin_family = AF_INET;
    551 			}
    552 			ia->ia_ifp = ifp;
    553 			ia->ia_idsalt = cprng_fast32() % 65535;
    554 			LIST_INIT(&ia->ia_multiaddrs);
    555 			IN_ADDRHASH_ENTRY_INIT(ia);
    556 			IN_ADDRLIST_ENTRY_INIT(ia);
    557 			ifa_psref_init(&ia->ia_ifa);
    558 			/*
    559 			 * We need a reference to make ia survive over in_ifinit
    560 			 * that does ifaref and ifafree.
    561 			 */
    562 			ifaref(&ia->ia_ifa);
    563 
    564 			newifaddr = 1;
    565 		}
    566 		break;
    567 
    568 	case SIOCSIFBRDADDR:
    569 		if (kauth_authorize_network(kauth_cred_get(),
    570 		    KAUTH_NETWORK_INTERFACE,
    571 		    KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
    572 		    NULL) != 0) {
    573 			error = EPERM;
    574 			goto out;
    575 		}
    576 		/* FALLTHROUGH */
    577 
    578 	case SIOCGIFADDR:
    579 	case SIOCGIFNETMASK:
    580 	case SIOCGIFDSTADDR:
    581 	case SIOCGIFBRDADDR:
    582 		if (ia == NULL) {
    583 			error = EADDRNOTAVAIL;
    584 			goto out;
    585 		}
    586 		break;
    587 	}
    588 	error = 0;
    589 	switch (cmd) {
    590 
    591 	case SIOCGIFADDR:
    592 		ifreq_setaddr(cmd, ifr, sintocsa(&ia->ia_addr));
    593 		break;
    594 
    595 	case SIOCGIFBRDADDR:
    596 		if ((ifp->if_flags & IFF_BROADCAST) == 0) {
    597 			error = EINVAL;
    598 			goto out;
    599 		}
    600 		ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_broadaddr));
    601 		break;
    602 
    603 	case SIOCGIFDSTADDR:
    604 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
    605 			error = EINVAL;
    606 			goto out;
    607 		}
    608 		ifreq_setdstaddr(cmd, ifr, sintocsa(&ia->ia_dstaddr));
    609 		break;
    610 
    611 	case SIOCGIFNETMASK:
    612 		/*
    613 		 * We keep the number of trailing zero bytes the sin_len field
    614 		 * of ia_sockmask, so we fix this before we pass it back to
    615 		 * userland.
    616 		 */
    617 		oldaddr = ia->ia_sockmask;
    618 		oldaddr.sin_len = sizeof(struct sockaddr_in);
    619 		ifreq_setaddr(cmd, ifr, (const void *)&oldaddr);
    620 		break;
    621 
    622 	case SIOCSIFDSTADDR:
    623 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
    624 			error = EINVAL;
    625 			goto out;
    626 		}
    627 		oldaddr = ia->ia_dstaddr;
    628 		ia->ia_dstaddr = *satocsin(ifreq_getdstaddr(cmd, ifr));
    629 		if ((error = if_addr_init(ifp, &ia->ia_ifa, false)) != 0) {
    630 			ia->ia_dstaddr = oldaddr;
    631 			goto out;
    632 		}
    633 		if (ia->ia_flags & IFA_ROUTE) {
    634 			ia->ia_ifa.ifa_dstaddr = sintosa(&oldaddr);
    635 			rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
    636 			ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
    637 			rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST|RTF_UP);
    638 		}
    639 		break;
    640 
    641 	case SIOCSIFBRDADDR:
    642 		if ((ifp->if_flags & IFF_BROADCAST) == 0) {
    643 			error = EINVAL;
    644 			goto out;
    645 		}
    646 		ia->ia_broadaddr = *satocsin(ifreq_getbroadaddr(cmd, ifr));
    647 		break;
    648 
    649 	case SIOCSIFADDR:
    650 		if (!newifaddr) {
    651 			in_addrhash_remove(ia);
    652 			need_reinsert = true;
    653 		}
    654 		error = in_ifinit(ifp, ia, satocsin(ifreq_getaddr(cmd, ifr)),
    655 		    NULL, 1);
    656 
    657 		run_hook = true;
    658 		break;
    659 
    660 	case SIOCSIFNETMASK:
    661 		in_scrubprefix(ia);
    662 		ia->ia_sockmask = *satocsin(ifreq_getaddr(cmd, ifr));
    663 		ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr;
    664 		if (!newifaddr) {
    665 			in_addrhash_remove(ia);
    666 			need_reinsert = true;
    667 		}
    668 		error = in_ifinit(ifp, ia, NULL, NULL, 0);
    669 		break;
    670 
    671 	case SIOCAIFADDR:
    672 		maskIsNew = 0;
    673 		if (ifra->ifra_mask.sin_len) {
    674 			in_scrubprefix(ia);
    675 			ia->ia_sockmask = ifra->ifra_mask;
    676 			ia->ia_subnetmask = ia->ia_sockmask.sin_addr.s_addr;
    677 			maskIsNew = 1;
    678 		}
    679 		if ((ifp->if_flags & IFF_POINTOPOINT) &&
    680 		    (ifra->ifra_dstaddr.sin_family == AF_INET)) {
    681 			new_dstaddr = &ifra->ifra_dstaddr;
    682 			maskIsNew  = 1; /* We lie; but the effect's the same */
    683 		} else
    684 			new_dstaddr = NULL;
    685 		if (ifra->ifra_addr.sin_family == AF_INET &&
    686 		    (hostIsNew || maskIsNew)) {
    687 			if (!newifaddr) {
    688 				in_addrhash_remove(ia);
    689 				need_reinsert = true;
    690 			}
    691 			error = in_ifinit(ifp, ia, &ifra->ifra_addr,
    692 			    new_dstaddr, 0);
    693 		}
    694 		if ((ifp->if_flags & IFF_BROADCAST) &&
    695 		    (ifra->ifra_broadaddr.sin_family == AF_INET))
    696 			ia->ia_broadaddr = ifra->ifra_broadaddr;
    697 		run_hook = true;
    698 		break;
    699 
    700 	case SIOCGIFALIAS:
    701 		ifra->ifra_mask = ia->ia_sockmask;
    702 		if ((ifp->if_flags & IFF_POINTOPOINT) &&
    703 		    (ia->ia_dstaddr.sin_family == AF_INET))
    704 			ifra->ifra_dstaddr = ia->ia_dstaddr;
    705 		else if ((ifp->if_flags & IFF_BROADCAST) &&
    706 		    (ia->ia_broadaddr.sin_family == AF_INET))
    707 			ifra->ifra_broadaddr = ia->ia_broadaddr;
    708 		else
    709 			memset(&ifra->ifra_broadaddr, 0,
    710 			      sizeof(ifra->ifra_broadaddr));
    711 		break;
    712 
    713 	case SIOCGIFAFLAG_IN:
    714 		ifr->ifr_addrflags = ia->ia4_flags;
    715 		break;
    716 
    717 	case SIOCDIFADDR:
    718 		ia4_release(ia, &psref);
    719 		ifaref(&ia->ia_ifa);
    720 		in_purgeaddr(&ia->ia_ifa);
    721 		pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa);
    722 		ifafree(&ia->ia_ifa);
    723 		ia = NULL;
    724 		break;
    725 
    726 #ifdef MROUTING
    727 	case SIOCGETVIFCNT:
    728 	case SIOCGETSGCNT:
    729 		error = mrt_ioctl(so, cmd, data);
    730 		break;
    731 #endif /* MROUTING */
    732 
    733 	default:
    734 		error = ENOTTY;
    735 		goto out;
    736 	}
    737 
    738 	/*
    739 	 * XXX insert regardless of error to make in_purgeaddr below work.
    740 	 * Need to improve.
    741 	 */
    742 	if (newifaddr) {
    743 		ifaref(&ia->ia_ifa);
    744 		ifa_insert(ifp, &ia->ia_ifa);
    745 
    746 		mutex_enter(&in_ifaddr_lock);
    747 		TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_list);
    748 		IN_ADDRLIST_WRITER_INSERT_TAIL(ia);
    749 		in_addrhash_insert_locked(ia);
    750 		/* Release a reference that is held just after creation. */
    751 		ifafree(&ia->ia_ifa);
    752 		mutex_exit(&in_ifaddr_lock);
    753 	} else if (need_reinsert) {
    754 		in_addrhash_insert(ia);
    755 	}
    756 
    757 	if (error == 0) {
    758 		if (run_hook)
    759 			pfil_run_addrhooks(if_pfil, cmd, &ia->ia_ifa);
    760 	} else if (newifaddr) {
    761 		KASSERT(ia != NULL);
    762 		in_purgeaddr(&ia->ia_ifa);
    763 		ia = NULL;
    764 	}
    765 
    766 out:
    767 	if (!newifaddr && ia != NULL)
    768 		ia4_release(ia, &psref);
    769 	curlwp_bindx(bound);
    770 	return error;
    771 }
    772 
    773 int
    774 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp)
    775 {
    776 	int error;
    777 
    778 #ifndef NET_MPSAFE
    779 	KASSERT(KERNEL_LOCKED_P());
    780 #endif
    781 	error = in_control0(so, cmd, data, ifp);
    782 
    783 	return error;
    784 }
    785 
    786 /* Add ownaddr as loopback rtentry. */
    787 static void
    788 in_ifaddlocal(struct ifaddr *ifa)
    789 {
    790 	struct in_ifaddr *ia;
    791 
    792 	ia = (struct in_ifaddr *)ifa;
    793 	if ((ia->ia_ifp->if_flags & IFF_UNNUMBERED)) {
    794 		rt_addrmsg(RTM_NEWADDR, ifa);
    795 		return;
    796 	}
    797 	if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY ||
    798 	    (ia->ia_ifp->if_flags & IFF_POINTOPOINT &&
    799 	    in_hosteq(ia->ia_dstaddr.sin_addr, ia->ia_addr.sin_addr)))
    800 	{
    801 		rt_addrmsg(RTM_NEWADDR, ifa);
    802 		return;
    803 	}
    804 
    805 	rt_ifa_addlocal(ifa);
    806 }
    807 
    808 /* Remove loopback entry of ownaddr */
    809 static void
    810 in_ifremlocal(struct ifaddr *ifa)
    811 {
    812 	struct in_ifaddr *ia, *p;
    813 	struct ifaddr *alt_ifa = NULL;
    814 	int ia_count = 0;
    815 	int s;
    816 	struct psref psref;
    817 	int bound = curlwp_bind();
    818 
    819 	ia = (struct in_ifaddr *)ifa;
    820 	if ((ia->ia_ifp->if_flags & IFF_UNNUMBERED)) {
    821 		rt_addrmsg(RTM_DELADDR, ifa);
    822 		goto out;
    823 	}
    824 	/* Delete the entry if exactly one ifaddr matches the
    825 	 * address, ifa->ifa_addr. */
    826 	s = pserialize_read_enter();
    827 	IN_ADDRLIST_READER_FOREACH(p) {
    828 		if ((p->ia_ifp->if_flags & IFF_UNNUMBERED))
    829 			continue;
    830 
    831 		if (!in_hosteq(p->ia_addr.sin_addr, ia->ia_addr.sin_addr))
    832 			continue;
    833 		if (p->ia_ifp != ia->ia_ifp)
    834 			alt_ifa = &p->ia_ifa;
    835 		if (++ia_count > 1 && alt_ifa != NULL)
    836 			break;
    837 	}
    838 	if (alt_ifa != NULL && ia_count > 1)
    839 		ifa_acquire(alt_ifa, &psref);
    840 	pserialize_read_exit(s);
    841 
    842 	if (ia_count == 0)
    843 		goto out;
    844 
    845 	rt_ifa_remlocal(ifa, ia_count == 1 ? NULL : alt_ifa);
    846 	if (alt_ifa != NULL && ia_count > 1)
    847 		ifa_release(alt_ifa, &psref);
    848 out:
    849 	curlwp_bindx(bound);
    850 }
    851 
    852 static void
    853 in_scrubaddr(struct in_ifaddr *ia)
    854 {
    855 
    856 	/* stop DAD processing */
    857 	if (ia->ia_dad_stop != NULL)
    858 		ia->ia_dad_stop(&ia->ia_ifa);
    859 
    860 	in_scrubprefix(ia);
    861 	in_ifremlocal(&ia->ia_ifa);
    862 
    863 	mutex_enter(&in_ifaddr_lock);
    864 	if (ia->ia_allhosts != NULL) {
    865 		in_delmulti(ia->ia_allhosts);
    866 		ia->ia_allhosts = NULL;
    867 	}
    868 	mutex_exit(&in_ifaddr_lock);
    869 }
    870 
    871 /*
    872  * Depends on it isn't called in concurrent. It should be guaranteed
    873  * by ifa->ifa_ifp's ioctl lock. The possible callers are in_control
    874  * and if_purgeaddrs; the former is called iva ifa->ifa_ifp's ioctl
    875  * and the latter is called via ifa->ifa_ifp's if_detach. The functions
    876  * never be executed in concurrent.
    877  */
    878 void
    879 in_purgeaddr(struct ifaddr *ifa)
    880 {
    881 	struct in_ifaddr *ia = (void *) ifa;
    882 	struct ifnet *ifp = ifa->ifa_ifp;
    883 
    884 	/* KASSERT(!ifa_held(ifa)); XXX need ifa_not_held (psref_not_held) */
    885 
    886 	ifa->ifa_flags |= IFA_DESTROYING;
    887 	in_scrubaddr(ia);
    888 
    889 	mutex_enter(&in_ifaddr_lock);
    890 	in_addrhash_remove_locked(ia);
    891 	TAILQ_REMOVE(&in_ifaddrhead, ia, ia_list);
    892 	IN_ADDRLIST_WRITER_REMOVE(ia);
    893 	ifa_remove(ifp, &ia->ia_ifa);
    894 	/* Assume ifa_remove called pserialize_perform and psref_destroy */
    895 	mutex_exit(&in_ifaddr_lock);
    896 	IN_ADDRHASH_ENTRY_DESTROY(ia);
    897 	IN_ADDRLIST_ENTRY_DESTROY(ia);
    898 	ifafree(&ia->ia_ifa);
    899 	in_setmaxmtu();
    900 }
    901 
    902 static void
    903 in_addrhash_insert_locked(struct in_ifaddr *ia)
    904 {
    905 
    906 	KASSERT(mutex_owned(&in_ifaddr_lock));
    907 
    908 	LIST_INSERT_HEAD(&IN_IFADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia,
    909 	    ia_hash);
    910 	IN_ADDRHASH_ENTRY_INIT(ia);
    911 	IN_ADDRHASH_WRITER_INSERT_HEAD(ia);
    912 }
    913 
    914 void
    915 in_addrhash_insert(struct in_ifaddr *ia)
    916 {
    917 
    918 	mutex_enter(&in_ifaddr_lock);
    919 	in_addrhash_insert_locked(ia);
    920 	mutex_exit(&in_ifaddr_lock);
    921 }
    922 
    923 static void
    924 in_addrhash_remove_locked(struct in_ifaddr *ia)
    925 {
    926 
    927 	KASSERT(mutex_owned(&in_ifaddr_lock));
    928 
    929 	LIST_REMOVE(ia, ia_hash);
    930 	IN_ADDRHASH_WRITER_REMOVE(ia);
    931 }
    932 
    933 void
    934 in_addrhash_remove(struct in_ifaddr *ia)
    935 {
    936 
    937 	mutex_enter(&in_ifaddr_lock);
    938 	in_addrhash_remove_locked(ia);
    939 #ifdef NET_MPSAFE
    940 	pserialize_perform(in_ifaddrhash_psz);
    941 #endif
    942 	mutex_exit(&in_ifaddr_lock);
    943 	IN_ADDRHASH_ENTRY_DESTROY(ia);
    944 }
    945 
    946 void
    947 in_purgeif(struct ifnet *ifp)		/* MUST be called at splsoftnet() */
    948 {
    949 
    950 	IFNET_LOCK(ifp);
    951 	if_purgeaddrs(ifp, AF_INET, in_purgeaddr);
    952 	igmp_purgeif(ifp);		/* manipulates pools */
    953 #ifdef MROUTING
    954 	ip_mrouter_detach(ifp);
    955 #endif
    956 	IFNET_UNLOCK(ifp);
    957 }
    958 
    959 /*
    960  * SIOC[GAD]LIFADDR.
    961  *	SIOCGLIFADDR: get first address. (???)
    962  *	SIOCGLIFADDR with IFLR_PREFIX:
    963  *		get first address that matches the specified prefix.
    964  *	SIOCALIFADDR: add the specified address.
    965  *	SIOCALIFADDR with IFLR_PREFIX:
    966  *		EINVAL since we can't deduce hostid part of the address.
    967  *	SIOCDLIFADDR: delete the specified address.
    968  *	SIOCDLIFADDR with IFLR_PREFIX:
    969  *		delete the first address that matches the specified prefix.
    970  * return values:
    971  *	EINVAL on invalid parameters
    972  *	EADDRNOTAVAIL on prefix match failed/specified address not found
    973  *	other values may be returned from in_ioctl()
    974  */
    975 static int
    976 in_lifaddr_ioctl(struct socket *so, u_long cmd, void *data,
    977     struct ifnet *ifp)
    978 {
    979 	struct if_laddrreq *iflr = (struct if_laddrreq *)data;
    980 	struct ifaddr *ifa;
    981 	struct sockaddr *sa;
    982 
    983 	/* sanity checks */
    984 	if (data == NULL || ifp == NULL) {
    985 		panic("invalid argument to in_lifaddr_ioctl");
    986 		/*NOTRECHED*/
    987 	}
    988 
    989 	switch (cmd) {
    990 	case SIOCGLIFADDR:
    991 		/* address must be specified on GET with IFLR_PREFIX */
    992 		if ((iflr->flags & IFLR_PREFIX) == 0)
    993 			break;
    994 		/*FALLTHROUGH*/
    995 	case SIOCALIFADDR:
    996 	case SIOCDLIFADDR:
    997 		/* address must be specified on ADD and DELETE */
    998 		sa = (struct sockaddr *)&iflr->addr;
    999 		if (sa->sa_family != AF_INET)
   1000 			return EINVAL;
   1001 		if (sa->sa_len != sizeof(struct sockaddr_in))
   1002 			return EINVAL;
   1003 		/* XXX need improvement */
   1004 		sa = (struct sockaddr *)&iflr->dstaddr;
   1005 		if (sa->sa_family != AF_UNSPEC && sa->sa_family != AF_INET)
   1006 			return EINVAL;
   1007 		if (sa->sa_len != 0 && sa->sa_len != sizeof(struct sockaddr_in))
   1008 			return EINVAL;
   1009 		break;
   1010 	default: /*shouldn't happen*/
   1011 #if 0
   1012 		panic("invalid cmd to in_lifaddr_ioctl");
   1013 		/*NOTREACHED*/
   1014 #else
   1015 		return EOPNOTSUPP;
   1016 #endif
   1017 	}
   1018 	if (sizeof(struct in_addr) * NBBY < iflr->prefixlen)
   1019 		return EINVAL;
   1020 
   1021 	switch (cmd) {
   1022 	case SIOCALIFADDR:
   1023 	    {
   1024 		struct in_aliasreq ifra;
   1025 
   1026 		if (iflr->flags & IFLR_PREFIX)
   1027 			return EINVAL;
   1028 
   1029 		/* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR). */
   1030 		memset(&ifra, 0, sizeof(ifra));
   1031 		memcpy(ifra.ifra_name, iflr->iflr_name,
   1032 			sizeof(ifra.ifra_name));
   1033 
   1034 		memcpy(&ifra.ifra_addr, &iflr->addr,
   1035 			((struct sockaddr *)&iflr->addr)->sa_len);
   1036 
   1037 		if (((struct sockaddr *)&iflr->dstaddr)->sa_family) {	/*XXX*/
   1038 			memcpy(&ifra.ifra_dstaddr, &iflr->dstaddr,
   1039 				((struct sockaddr *)&iflr->dstaddr)->sa_len);
   1040 		}
   1041 
   1042 		ifra.ifra_mask.sin_family = AF_INET;
   1043 		ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
   1044 		in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
   1045 
   1046 		return in_control(so, SIOCAIFADDR, &ifra, ifp);
   1047 	    }
   1048 	case SIOCGLIFADDR:
   1049 	case SIOCDLIFADDR:
   1050 	    {
   1051 		struct in_ifaddr *ia;
   1052 		struct in_addr mask, candidate, match;
   1053 		struct sockaddr_in *sin;
   1054 		int cmp, s;
   1055 
   1056 		memset(&mask, 0, sizeof(mask));
   1057 		memset(&match, 0, sizeof(match));	/* XXX gcc */
   1058 		if (iflr->flags & IFLR_PREFIX) {
   1059 			/* lookup a prefix rather than address. */
   1060 			in_len2mask(&mask, iflr->prefixlen);
   1061 
   1062 			sin = (struct sockaddr_in *)&iflr->addr;
   1063 			match.s_addr = sin->sin_addr.s_addr;
   1064 			match.s_addr &= mask.s_addr;
   1065 
   1066 			/* if you set extra bits, that's wrong */
   1067 			if (match.s_addr != sin->sin_addr.s_addr)
   1068 				return EINVAL;
   1069 
   1070 			cmp = 1;
   1071 		} else {
   1072 			if (cmd == SIOCGLIFADDR) {
   1073 				/* on getting an address, take the 1st match */
   1074 				cmp = 0;	/*XXX*/
   1075 			} else {
   1076 				/* on deleting an address, do exact match */
   1077 				in_len2mask(&mask, 32);
   1078 				sin = (struct sockaddr_in *)&iflr->addr;
   1079 				match.s_addr = sin->sin_addr.s_addr;
   1080 
   1081 				cmp = 1;
   1082 			}
   1083 		}
   1084 
   1085 		s = pserialize_read_enter();
   1086 		IFADDR_READER_FOREACH(ifa, ifp) {
   1087 			if (ifa->ifa_addr->sa_family != AF_INET)
   1088 				continue;
   1089 			if (cmp == 0)
   1090 				break;
   1091 			candidate.s_addr = ((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr;
   1092 			candidate.s_addr &= mask.s_addr;
   1093 			if (candidate.s_addr == match.s_addr)
   1094 				break;
   1095 		}
   1096 		if (ifa == NULL) {
   1097 			pserialize_read_exit(s);
   1098 			return EADDRNOTAVAIL;
   1099 		}
   1100 		ia = (struct in_ifaddr *)ifa;
   1101 
   1102 		if (cmd == SIOCGLIFADDR) {
   1103 			/* fill in the if_laddrreq structure */
   1104 			memcpy(&iflr->addr, &ia->ia_addr, ia->ia_addr.sin_len);
   1105 
   1106 			if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
   1107 				memcpy(&iflr->dstaddr, &ia->ia_dstaddr,
   1108 					ia->ia_dstaddr.sin_len);
   1109 			} else
   1110 				memset(&iflr->dstaddr, 0, sizeof(iflr->dstaddr));
   1111 
   1112 			iflr->prefixlen =
   1113 				in_mask2len(&ia->ia_sockmask.sin_addr);
   1114 
   1115 			iflr->flags = 0;	/*XXX*/
   1116 			pserialize_read_exit(s);
   1117 
   1118 			return 0;
   1119 		} else {
   1120 			struct in_aliasreq ifra;
   1121 
   1122 			/* fill in_aliasreq and do ioctl(SIOCDIFADDR) */
   1123 			memset(&ifra, 0, sizeof(ifra));
   1124 			memcpy(ifra.ifra_name, iflr->iflr_name,
   1125 				sizeof(ifra.ifra_name));
   1126 
   1127 			memcpy(&ifra.ifra_addr, &ia->ia_addr,
   1128 				ia->ia_addr.sin_len);
   1129 			if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
   1130 				memcpy(&ifra.ifra_dstaddr, &ia->ia_dstaddr,
   1131 					ia->ia_dstaddr.sin_len);
   1132 			}
   1133 			memcpy(&ifra.ifra_dstaddr, &ia->ia_sockmask,
   1134 				ia->ia_sockmask.sin_len);
   1135 			pserialize_read_exit(s);
   1136 
   1137 			return in_control(so, SIOCDIFADDR, &ifra, ifp);
   1138 		}
   1139 	    }
   1140 	}
   1141 
   1142 	return EOPNOTSUPP;	/*just for safety*/
   1143 }
   1144 
   1145 /*
   1146  * Initialize an interface's internet address
   1147  * and routing table entry.
   1148  */
   1149 int
   1150 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
   1151     const struct sockaddr_in *sin, const struct sockaddr_in *dst, int scrub)
   1152 {
   1153 	u_int32_t i;
   1154 	struct sockaddr_in oldaddr, olddst;
   1155 	int s, oldflags, flags = RTF_UP, error, hostIsNew;
   1156 
   1157 	if (sin == NULL)
   1158 		sin = &ia->ia_addr;
   1159 	if (dst == NULL)
   1160 		dst = &ia->ia_dstaddr;
   1161 
   1162 	/*
   1163 	 * Set up new addresses.
   1164 	 */
   1165 	oldaddr = ia->ia_addr;
   1166 	olddst = ia->ia_dstaddr;
   1167 	oldflags = ia->ia4_flags;
   1168 	ia->ia_addr = *sin;
   1169 	ia->ia_dstaddr = *dst;
   1170 	hostIsNew = oldaddr.sin_family != AF_INET ||
   1171 	    !in_hosteq(ia->ia_addr.sin_addr, oldaddr.sin_addr);
   1172 	if (!scrub)
   1173 		scrub = oldaddr.sin_family != ia->ia_dstaddr.sin_family ||
   1174 		    !in_hosteq(ia->ia_dstaddr.sin_addr, olddst.sin_addr);
   1175 
   1176 	/*
   1177 	 * Configure address flags.
   1178 	 * We need to do this early because they may be adjusted
   1179 	 * by if_addr_init depending on the address.
   1180 	 */
   1181 	if (ia->ia4_flags & IN_IFF_DUPLICATED) {
   1182 		ia->ia4_flags &= ~IN_IFF_DUPLICATED;
   1183 		hostIsNew = 1;
   1184 	}
   1185 	if (ifp->if_link_state == LINK_STATE_DOWN) {
   1186 		ia->ia4_flags |= IN_IFF_DETACHED;
   1187 		ia->ia4_flags &= ~IN_IFF_TENTATIVE;
   1188 	} else if (hostIsNew && if_do_dad(ifp) && ip_dad_enabled())
   1189 		ia->ia4_flags |= IN_IFF_TRYTENTATIVE;
   1190 
   1191 	/*
   1192 	 * Give the interface a chance to initialize
   1193 	 * if this is its first address,
   1194 	 * and to validate the address if necessary.
   1195 	 */
   1196 	s = splsoftnet();
   1197 	error = if_addr_init(ifp, &ia->ia_ifa, true);
   1198 	splx(s);
   1199 	/* Now clear the try tentative flag, its job is done. */
   1200 	ia->ia4_flags &= ~IN_IFF_TRYTENTATIVE;
   1201 	if (error != 0) {
   1202 		ia->ia_addr = oldaddr;
   1203 		ia->ia_dstaddr = olddst;
   1204 		ia->ia4_flags = oldflags;
   1205 		return error;
   1206 	}
   1207 
   1208 	/*
   1209 	 * The interface which does not have IPv4 address is not required
   1210 	 * to scrub old address.  So, skip scrub such cases.
   1211 	 */
   1212 	if (oldaddr.sin_family == AF_INET && (scrub || hostIsNew)) {
   1213 		int newflags = ia->ia4_flags;
   1214 
   1215 		ia->ia_ifa.ifa_addr = sintosa(&oldaddr);
   1216 		ia->ia_ifa.ifa_dstaddr = sintosa(&olddst);
   1217 		ia->ia4_flags = oldflags;
   1218 		if (hostIsNew)
   1219 			in_scrubaddr(ia);
   1220 		else if (scrub)
   1221 			in_scrubprefix(ia);
   1222 		ia->ia_ifa.ifa_addr = sintosa(&ia->ia_addr);
   1223 		ia->ia_ifa.ifa_dstaddr = sintosa(&ia->ia_dstaddr);
   1224 		ia->ia4_flags = newflags;
   1225 	}
   1226 
   1227 	i = ia->ia_addr.sin_addr.s_addr;
   1228 	if (ifp->if_flags & IFF_POINTOPOINT)
   1229 		ia->ia_netmask = INADDR_BROADCAST;	/* default to /32 */
   1230 	else if (IN_CLASSA(i))
   1231 		ia->ia_netmask = IN_CLASSA_NET;
   1232 	else if (IN_CLASSB(i))
   1233 		ia->ia_netmask = IN_CLASSB_NET;
   1234 	else
   1235 		ia->ia_netmask = IN_CLASSC_NET;
   1236 	/*
   1237 	 * The subnet mask usually includes at least the standard network part,
   1238 	 * but may may be smaller in the case of supernetting.
   1239 	 * If it is set, we believe it.
   1240 	 */
   1241 	if (ia->ia_subnetmask == 0) {
   1242 		ia->ia_subnetmask = ia->ia_netmask;
   1243 		ia->ia_sockmask.sin_addr.s_addr = ia->ia_subnetmask;
   1244 	} else
   1245 		ia->ia_netmask &= ia->ia_subnetmask;
   1246 
   1247 	ia->ia_net = i & ia->ia_netmask;
   1248 	ia->ia_subnet = i & ia->ia_subnetmask;
   1249 	in_socktrim(&ia->ia_sockmask);
   1250 
   1251 	/* re-calculate the "in_maxmtu" value */
   1252 	in_setmaxmtu();
   1253 
   1254 	ia->ia_ifa.ifa_metric = ifp->if_metric;
   1255 	if (ifp->if_flags & IFF_BROADCAST) {
   1256 		if (ia->ia_subnetmask == IN_RFC3021_MASK) {
   1257 			ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
   1258 			ia->ia_netbroadcast.s_addr = INADDR_BROADCAST;
   1259 		} else {
   1260 			ia->ia_broadaddr.sin_addr.s_addr =
   1261 				ia->ia_subnet | ~ia->ia_subnetmask;
   1262 			ia->ia_netbroadcast.s_addr =
   1263 				ia->ia_net | ~ia->ia_netmask;
   1264 		}
   1265 	} else if (ifp->if_flags & IFF_LOOPBACK) {
   1266 		ia->ia_dstaddr = ia->ia_addr;
   1267 		flags |= RTF_HOST;
   1268 	} else if (ifp->if_flags & IFF_POINTOPOINT) {
   1269 		if (ia->ia_dstaddr.sin_family != AF_INET)
   1270 			return (0);
   1271 		flags |= RTF_HOST;
   1272 	}
   1273 
   1274 	/* Add the local route to the address */
   1275 	in_ifaddlocal(&ia->ia_ifa);
   1276 
   1277 	/* Add the prefix route for the address */
   1278 	error = in_addprefix(ia, flags);
   1279 
   1280 	/*
   1281 	 * If the interface supports multicast, join the "all hosts"
   1282 	 * multicast group on that interface.
   1283 	 */
   1284 	mutex_enter(&in_ifaddr_lock);
   1285 	if ((ifp->if_flags & IFF_MULTICAST) != 0 && ia->ia_allhosts == NULL) {
   1286 		struct in_addr addr;
   1287 
   1288 		addr.s_addr = INADDR_ALLHOSTS_GROUP;
   1289 		ia->ia_allhosts = in_addmulti(&addr, ifp);
   1290 	}
   1291 	mutex_exit(&in_ifaddr_lock);
   1292 
   1293 	if (hostIsNew &&
   1294 	    ia->ia4_flags & IN_IFF_TENTATIVE &&
   1295 	    if_do_dad(ifp))
   1296 		ia->ia_dad_start((struct ifaddr *)ia);
   1297 
   1298 	return error;
   1299 }
   1300 
   1301 #define rtinitflags(x) \
   1302 	((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
   1303 	    ? RTF_HOST : 0)
   1304 
   1305 /*
   1306  * add a route to prefix ("connected route" in cisco terminology).
   1307  * does nothing if there's some interface address with the same prefix already.
   1308  */
   1309 static int
   1310 in_addprefix(struct in_ifaddr *target, int flags)
   1311 {
   1312 	struct in_ifaddr *ia;
   1313 	struct in_addr prefix, mask, p;
   1314 	int error;
   1315 	int s;
   1316 
   1317 	if ((flags & RTF_HOST) != 0)
   1318 		prefix = target->ia_dstaddr.sin_addr;
   1319 	else {
   1320 		prefix = target->ia_addr.sin_addr;
   1321 		mask = target->ia_sockmask.sin_addr;
   1322 		prefix.s_addr &= mask.s_addr;
   1323 	}
   1324 
   1325 	s = pserialize_read_enter();
   1326 	IN_ADDRLIST_READER_FOREACH(ia) {
   1327 		if (rtinitflags(ia))
   1328 			p = ia->ia_dstaddr.sin_addr;
   1329 		else {
   1330 			p = ia->ia_addr.sin_addr;
   1331 			p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
   1332 		}
   1333 
   1334 		if (prefix.s_addr != p.s_addr)
   1335 			continue;
   1336 
   1337 		if ((ia->ia_ifp->if_flags & IFF_UNNUMBERED))
   1338 			continue;
   1339 
   1340 		/*
   1341 		 * if we got a matching prefix route inserted by other
   1342 		 * interface address, we don't need to bother
   1343 		 *
   1344 		 * XXX RADIX_MPATH implications here? -dyoung
   1345 		 */
   1346 		if (ia->ia_flags & IFA_ROUTE) {
   1347 			pserialize_read_exit(s);
   1348 			return 0;
   1349 		}
   1350 	}
   1351 	pserialize_read_exit(s);
   1352 
   1353 	/*
   1354 	 * noone seem to have prefix route.  insert it.
   1355 	 */
   1356 	if (target->ia_ifa.ifa_ifp->if_flags & IFF_UNNUMBERED) {
   1357 		error = 0;
   1358 	} else {
   1359 		error = rtinit(&target->ia_ifa, RTM_ADD, flags);
   1360 		if (error == 0)
   1361 			target->ia_flags |= IFA_ROUTE;
   1362 		else if (error == EEXIST) {
   1363 			/*
   1364 			 * the fact the route already exists is not an error.
   1365 			 */
   1366 			error = 0;
   1367 		}
   1368 	}
   1369 	return error;
   1370 }
   1371 
   1372 static int
   1373 in_rt_ifa_matcher(struct rtentry *rt, void *v)
   1374 {
   1375 	struct ifaddr *ifa = v;
   1376 
   1377 	if (rt->rt_ifa == ifa)
   1378 		return 1;
   1379 	else
   1380 		return 0;
   1381 }
   1382 
   1383 /*
   1384  * remove a route to prefix ("connected route" in cisco terminology).
   1385  * re-installs the route by using another interface address, if there's one
   1386  * with the same prefix (otherwise we lose the route mistakenly).
   1387  */
   1388 static int
   1389 in_scrubprefix(struct in_ifaddr *target)
   1390 {
   1391 	struct in_ifaddr *ia;
   1392 	struct in_addr prefix, mask, p;
   1393 	int error;
   1394 	int s;
   1395 
   1396 	/* If we don't have IFA_ROUTE we have nothing to do */
   1397 	if ((target->ia_flags & IFA_ROUTE) == 0)
   1398 		return 0;
   1399 
   1400 	if (rtinitflags(target))
   1401 		prefix = target->ia_dstaddr.sin_addr;
   1402 	else {
   1403 		prefix = target->ia_addr.sin_addr;
   1404 		mask = target->ia_sockmask.sin_addr;
   1405 		prefix.s_addr &= mask.s_addr;
   1406 	}
   1407 
   1408 	s = pserialize_read_enter();
   1409 	IN_ADDRLIST_READER_FOREACH(ia) {
   1410 		if (rtinitflags(ia))
   1411 			p = ia->ia_dstaddr.sin_addr;
   1412 		else {
   1413 			p = ia->ia_addr.sin_addr;
   1414 			p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
   1415 		}
   1416 
   1417 		if (prefix.s_addr != p.s_addr)
   1418 			continue;
   1419 
   1420 		if ((ia->ia_ifp->if_flags & IFF_UNNUMBERED))
   1421 			continue;
   1422 
   1423 		/*
   1424 		 * if we got a matching prefix route, move IFA_ROUTE to him
   1425 		 */
   1426 		if ((ia->ia_flags & IFA_ROUTE) == 0) {
   1427 			struct psref psref;
   1428 			int bound = curlwp_bind();
   1429 
   1430 			ia4_acquire(ia, &psref);
   1431 			pserialize_read_exit(s);
   1432 
   1433 			rtinit(&target->ia_ifa, RTM_DELETE,
   1434 			    rtinitflags(target));
   1435 			target->ia_flags &= ~IFA_ROUTE;
   1436 
   1437 			error = rtinit(&ia->ia_ifa, RTM_ADD,
   1438 			    rtinitflags(ia) | RTF_UP);
   1439 			if (error == 0)
   1440 				ia->ia_flags |= IFA_ROUTE;
   1441 
   1442 			if (!ISSET(target->ia_ifa.ifa_flags, IFA_DESTROYING))
   1443 				goto skip;
   1444 			/*
   1445 			 * Replace rt_ifa of routes that have the removing address
   1446 			 * with the new address.
   1447 			 */
   1448 			rt_replace_ifa_matched_entries(AF_INET,
   1449 			    in_rt_ifa_matcher, &target->ia_ifa, &ia->ia_ifa);
   1450 
   1451 		skip:
   1452 			ia4_release(ia, &psref);
   1453 			curlwp_bindx(bound);
   1454 
   1455 			return error;
   1456 		}
   1457 	}
   1458 	pserialize_read_exit(s);
   1459 
   1460 	/*
   1461 	 * noone seem to have prefix route.  remove it.
   1462 	 */
   1463 	rtinit(&target->ia_ifa, RTM_DELETE, rtinitflags(target));
   1464 	target->ia_flags &= ~IFA_ROUTE;
   1465 
   1466 	if (ISSET(target->ia_ifa.ifa_flags, IFA_DESTROYING)) {
   1467 		/* Remove routes that have the removing address as rt_ifa. */
   1468 		rt_delete_matched_entries(AF_INET, in_rt_ifa_matcher,
   1469 		    &target->ia_ifa, true);
   1470 	}
   1471 
   1472 	return 0;
   1473 }
   1474 
   1475 #undef rtinitflags
   1476 
   1477 /*
   1478  * Return 1 if the address might be a local broadcast address.
   1479  */
   1480 int
   1481 in_broadcast(struct in_addr in, struct ifnet *ifp)
   1482 {
   1483 	struct ifaddr *ifa;
   1484 	int s;
   1485 
   1486 	KASSERT(ifp != NULL);
   1487 
   1488 	if (in.s_addr == INADDR_BROADCAST ||
   1489 	    in_nullhost(in))
   1490 		return 1;
   1491 	if ((ifp->if_flags & IFF_BROADCAST) == 0)
   1492 		return 0;
   1493 	/*
   1494 	 * Look through the list of addresses for a match
   1495 	 * with a broadcast address.
   1496 	 */
   1497 #define ia (ifatoia(ifa))
   1498 	s = pserialize_read_enter();
   1499 	IFADDR_READER_FOREACH(ifa, ifp) {
   1500 		if (ifa->ifa_addr->sa_family == AF_INET &&
   1501 		    !in_hosteq(in, ia->ia_addr.sin_addr) &&
   1502 		    (in_hosteq(in, ia->ia_broadaddr.sin_addr) ||
   1503 		     in_hosteq(in, ia->ia_netbroadcast) ||
   1504 		     (hostzeroisbroadcast &&
   1505 		      /*
   1506 		       * Check for old-style (host 0) broadcast, but
   1507 		       * taking into account that RFC 3021 obsoletes it.
   1508 		       */
   1509 		      ia->ia_subnetmask != IN_RFC3021_MASK &&
   1510 		      (in.s_addr == ia->ia_subnet ||
   1511 		       in.s_addr == ia->ia_net)))) {
   1512 			pserialize_read_exit(s);
   1513 			return 1;
   1514 		}
   1515 	}
   1516 	pserialize_read_exit(s);
   1517 	return (0);
   1518 #undef ia
   1519 }
   1520 
   1521 /*
   1522  * perform DAD when interface becomes IFF_UP.
   1523  */
   1524 void
   1525 in_if_link_up(struct ifnet *ifp)
   1526 {
   1527 	struct ifaddr *ifa;
   1528 	struct in_ifaddr *ia;
   1529 	int s, bound;
   1530 
   1531 	/* Ensure it's sane to run DAD */
   1532 	if (ifp->if_link_state == LINK_STATE_DOWN)
   1533 		return;
   1534 	if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))
   1535 		return;
   1536 
   1537 	bound = curlwp_bind();
   1538 	s = pserialize_read_enter();
   1539 	IFADDR_READER_FOREACH(ifa, ifp) {
   1540 		struct psref psref;
   1541 
   1542 		if (ifa->ifa_addr->sa_family != AF_INET)
   1543 			continue;
   1544 		ifa_acquire(ifa, &psref);
   1545 		pserialize_read_exit(s);
   1546 
   1547 		ia = (struct in_ifaddr *)ifa;
   1548 
   1549 		/* If detached then mark as tentative */
   1550 		if (ia->ia4_flags & IN_IFF_DETACHED) {
   1551 			ia->ia4_flags &= ~IN_IFF_DETACHED;
   1552 			if (if_do_dad(ifp) && ia->ia_dad_start != NULL)
   1553 				ia->ia4_flags |= IN_IFF_TENTATIVE;
   1554 			else if ((ia->ia4_flags & IN_IFF_TENTATIVE) == 0)
   1555 				rt_addrmsg(RTM_NEWADDR, ifa);
   1556 		}
   1557 
   1558 		if (ia->ia4_flags & IN_IFF_TENTATIVE) {
   1559 			/* Clear the duplicated flag as we're starting DAD. */
   1560 			ia->ia4_flags &= ~IN_IFF_DUPLICATED;
   1561 			ia->ia_dad_start(ifa);
   1562 		}
   1563 
   1564 		s = pserialize_read_enter();
   1565 		ifa_release(ifa, &psref);
   1566 	}
   1567 	pserialize_read_exit(s);
   1568 	curlwp_bindx(bound);
   1569 }
   1570 
   1571 void
   1572 in_if_up(struct ifnet *ifp)
   1573 {
   1574 
   1575 	/* interface may not support link state, so bring it up also */
   1576 	in_if_link_up(ifp);
   1577 }
   1578 
   1579 /*
   1580  * Mark all addresses as detached.
   1581  */
   1582 void
   1583 in_if_link_down(struct ifnet *ifp)
   1584 {
   1585 	struct ifaddr *ifa;
   1586 	struct in_ifaddr *ia;
   1587 	int s, bound;
   1588 
   1589 	bound = curlwp_bind();
   1590 	s = pserialize_read_enter();
   1591 	IFADDR_READER_FOREACH(ifa, ifp) {
   1592 		struct psref psref;
   1593 
   1594 		if (ifa->ifa_addr->sa_family != AF_INET)
   1595 			continue;
   1596 		ifa_acquire(ifa, &psref);
   1597 		pserialize_read_exit(s);
   1598 
   1599 		ia = (struct in_ifaddr *)ifa;
   1600 
   1601 		/* Stop DAD processing */
   1602 		if (ia->ia_dad_stop != NULL)
   1603 			ia->ia_dad_stop(ifa);
   1604 
   1605 		/*
   1606 		 * Mark the address as detached.
   1607 		 */
   1608 		if (!(ia->ia4_flags & IN_IFF_DETACHED)) {
   1609 			ia->ia4_flags |= IN_IFF_DETACHED;
   1610 			ia->ia4_flags &=
   1611 			    ~(IN_IFF_TENTATIVE | IN_IFF_DUPLICATED);
   1612 			rt_addrmsg(RTM_NEWADDR, ifa);
   1613 		}
   1614 
   1615 		s = pserialize_read_enter();
   1616 		ifa_release(ifa, &psref);
   1617 	}
   1618 	pserialize_read_exit(s);
   1619 	curlwp_bindx(bound);
   1620 }
   1621 
   1622 void
   1623 in_if_down(struct ifnet *ifp)
   1624 {
   1625 
   1626 	in_if_link_down(ifp);
   1627 #if NARP > 0
   1628 	lltable_purge_entries(LLTABLE(ifp));
   1629 #endif
   1630 }
   1631 
   1632 void
   1633 in_if_link_state_change(struct ifnet *ifp, int link_state)
   1634 {
   1635 
   1636 	/*
   1637 	 * Treat LINK_STATE_UNKNOWN as UP.
   1638 	 * LINK_STATE_UNKNOWN transitions to LINK_STATE_DOWN when
   1639 	 * if_link_state_change() transitions to LINK_STATE_UP.
   1640 	 */
   1641 	if (link_state == LINK_STATE_DOWN)
   1642 		in_if_link_down(ifp);
   1643 	else
   1644 		in_if_link_up(ifp);
   1645 }
   1646 
   1647 /*
   1648  * in_lookup_multi: look up the in_multi record for a given IP
   1649  * multicast address on a given interface.  If no matching record is
   1650  * found, return NULL.
   1651  */
   1652 struct in_multi *
   1653 in_lookup_multi(struct in_addr addr, ifnet_t *ifp)
   1654 {
   1655 	struct in_multi *inm;
   1656 
   1657 	KASSERT(rw_lock_held(&in_multilock));
   1658 
   1659 	LIST_FOREACH(inm, &IN_MULTI_HASH(addr.s_addr, ifp), inm_list) {
   1660 		if (in_hosteq(inm->inm_addr, addr) && inm->inm_ifp == ifp)
   1661 			break;
   1662 	}
   1663 	return inm;
   1664 }
   1665 
   1666 /*
   1667  * in_multi_group: check whether the address belongs to an IP multicast
   1668  * group we are joined on this interface.  Returns true or false.
   1669  */
   1670 bool
   1671 in_multi_group(struct in_addr addr, ifnet_t *ifp, int flags)
   1672 {
   1673 	bool ingroup;
   1674 
   1675 	if (__predict_true(flags & IP_IGMP_MCAST) == 0) {
   1676 		rw_enter(&in_multilock, RW_READER);
   1677 		ingroup = in_lookup_multi(addr, ifp) != NULL;
   1678 		rw_exit(&in_multilock);
   1679 	} else {
   1680 		/* XXX Recursive call from ip_output(). */
   1681 		KASSERT(rw_lock_held(&in_multilock));
   1682 		ingroup = in_lookup_multi(addr, ifp) != NULL;
   1683 	}
   1684 	return ingroup;
   1685 }
   1686 
   1687 /*
   1688  * Add an address to the list of IP multicast addresses for a given interface.
   1689  */
   1690 struct in_multi *
   1691 in_addmulti(struct in_addr *ap, ifnet_t *ifp)
   1692 {
   1693 	struct sockaddr_in sin;
   1694 	struct in_multi *inm;
   1695 
   1696 	/*
   1697 	 * See if address already in list.
   1698 	 */
   1699 	rw_enter(&in_multilock, RW_WRITER);
   1700 	inm = in_lookup_multi(*ap, ifp);
   1701 	if (inm != NULL) {
   1702 		/*
   1703 		 * Found it; just increment the reference count.
   1704 		 */
   1705 		inm->inm_refcount++;
   1706 		rw_exit(&in_multilock);
   1707 		return inm;
   1708 	}
   1709 
   1710 	/*
   1711 	 * New address; allocate a new multicast record.
   1712 	 */
   1713 	inm = pool_get(&inmulti_pool, PR_NOWAIT);
   1714 	if (inm == NULL) {
   1715 		rw_exit(&in_multilock);
   1716 		return NULL;
   1717 	}
   1718 	inm->inm_addr = *ap;
   1719 	inm->inm_ifp = ifp;
   1720 	inm->inm_refcount = 1;
   1721 
   1722 	/*
   1723 	 * Ask the network driver to update its multicast reception
   1724 	 * filter appropriately for the new address.
   1725 	 */
   1726 	sockaddr_in_init(&sin, ap, 0);
   1727 	if (if_mcast_op(ifp, SIOCADDMULTI, sintosa(&sin)) != 0) {
   1728 		rw_exit(&in_multilock);
   1729 		pool_put(&inmulti_pool, inm);
   1730 		return NULL;
   1731 	}
   1732 
   1733 	/*
   1734 	 * Let IGMP know that we have joined a new IP multicast group.
   1735 	 */
   1736 	if (igmp_joingroup(inm) != 0) {
   1737 		rw_exit(&in_multilock);
   1738 		pool_put(&inmulti_pool, inm);
   1739 		return NULL;
   1740 	}
   1741 	LIST_INSERT_HEAD(
   1742 	    &IN_MULTI_HASH(inm->inm_addr.s_addr, ifp),
   1743 	    inm, inm_list);
   1744 	in_multientries++;
   1745 	rw_exit(&in_multilock);
   1746 
   1747 	return inm;
   1748 }
   1749 
   1750 /*
   1751  * Delete a multicast address record.
   1752  */
   1753 void
   1754 in_delmulti(struct in_multi *inm)
   1755 {
   1756 	struct sockaddr_in sin;
   1757 
   1758 	rw_enter(&in_multilock, RW_WRITER);
   1759 	if (--inm->inm_refcount > 0) {
   1760 		rw_exit(&in_multilock);
   1761 		return;
   1762 	}
   1763 
   1764 	/*
   1765 	 * No remaining claims to this record; let IGMP know that
   1766 	 * we are leaving the multicast group.
   1767 	 */
   1768 	igmp_leavegroup(inm);
   1769 
   1770 	/*
   1771 	 * Notify the network driver to update its multicast reception
   1772 	 * filter.
   1773 	 */
   1774 	sockaddr_in_init(&sin, &inm->inm_addr, 0);
   1775 	if_mcast_op(inm->inm_ifp, SIOCDELMULTI, sintosa(&sin));
   1776 
   1777 	/*
   1778 	 * Unlink from list.
   1779 	 */
   1780 	LIST_REMOVE(inm, inm_list);
   1781 	in_multientries--;
   1782 	rw_exit(&in_multilock);
   1783 
   1784 	pool_put(&inmulti_pool, inm);
   1785 }
   1786 
   1787 /*
   1788  * in_next_multi: step through all of the in_multi records, one at a time.
   1789  * The current position is remembered in "step", which the caller must
   1790  * provide.  in_first_multi(), below, must be called to initialize "step"
   1791  * and get the first record.  Both macros return a NULL "inm" when there
   1792  * are no remaining records.
   1793  */
   1794 struct in_multi *
   1795 in_next_multi(struct in_multistep *step)
   1796 {
   1797 	struct in_multi *inm;
   1798 
   1799 	KASSERT(rw_lock_held(&in_multilock));
   1800 
   1801 	while (step->i_inm == NULL && step->i_n < IN_MULTI_HASH_SIZE) {
   1802 		step->i_inm = LIST_FIRST(&in_multihashtbl[++step->i_n]);
   1803 	}
   1804 	if ((inm = step->i_inm) != NULL) {
   1805 		step->i_inm = LIST_NEXT(inm, inm_list);
   1806 	}
   1807 	return inm;
   1808 }
   1809 
   1810 struct in_multi *
   1811 in_first_multi(struct in_multistep *step)
   1812 {
   1813 	KASSERT(rw_lock_held(&in_multilock));
   1814 
   1815 	step->i_n = 0;
   1816 	step->i_inm = LIST_FIRST(&in_multihashtbl[0]);
   1817 	return in_next_multi(step);
   1818 }
   1819 
   1820 void
   1821 in_multi_lock(int op)
   1822 {
   1823 	rw_enter(&in_multilock, op);
   1824 }
   1825 
   1826 void
   1827 in_multi_unlock(void)
   1828 {
   1829 	rw_exit(&in_multilock);
   1830 }
   1831 
   1832 int
   1833 in_multi_lock_held(void)
   1834 {
   1835 	return rw_lock_held(&in_multilock);
   1836 }
   1837 
   1838 struct in_ifaddr *
   1839 in_selectsrc(struct sockaddr_in *sin, struct route *ro,
   1840     int soopts, struct ip_moptions *mopts, int *errorp, struct psref *psref)
   1841 {
   1842 	struct rtentry *rt = NULL;
   1843 	struct in_ifaddr *ia = NULL;
   1844 
   1845 	KASSERT(ISSET(curlwp->l_pflag, LP_BOUND));
   1846 	/*
   1847          * If route is known or can be allocated now, take the
   1848          * source address from the interface.  Otherwise, punt.
   1849 	 */
   1850 	if ((soopts & SO_DONTROUTE) != 0)
   1851 		rtcache_free(ro);
   1852 	else {
   1853 		union {
   1854 			struct sockaddr		dst;
   1855 			struct sockaddr_in	dst4;
   1856 		} u;
   1857 
   1858 		sockaddr_in_init(&u.dst4, &sin->sin_addr, 0);
   1859 		rt = rtcache_lookup(ro, &u.dst);
   1860 	}
   1861 	/*
   1862 	 * If we found a route, use the address
   1863 	 * corresponding to the outgoing interface
   1864 	 * unless it is the loopback (in case a route
   1865 	 * to our address on another net goes to loopback).
   1866 	 *
   1867 	 * XXX Is this still true?  Do we care?
   1868 	 */
   1869 	if (rt != NULL && (rt->rt_ifp->if_flags & IFF_LOOPBACK) == 0) {
   1870 		int s;
   1871 		struct ifaddr *ifa;
   1872 		/*
   1873 		 * Just in case. May not need to do this workaround.
   1874 		 * Revisit when working on rtentry MP-ification.
   1875 		 */
   1876 		s = pserialize_read_enter();
   1877 		IFADDR_READER_FOREACH(ifa, rt->rt_ifp) {
   1878 			if (ifa == rt->rt_ifa)
   1879 				break;
   1880 		}
   1881 		if (ifa != NULL)
   1882 			ifa_acquire(ifa, psref);
   1883 		pserialize_read_exit(s);
   1884 
   1885 		ia = ifatoia(ifa);
   1886 	}
   1887 	if (ia == NULL) {
   1888 		in_port_t fport = sin->sin_port;
   1889 		struct ifaddr *ifa;
   1890 		int s;
   1891 
   1892 		sin->sin_port = 0;
   1893 		ifa = ifa_ifwithladdr_psref(sintosa(sin), psref);
   1894 		sin->sin_port = fport;
   1895 		if (ifa == NULL) {
   1896 			/* Find 1st non-loopback AF_INET address */
   1897 			s = pserialize_read_enter();
   1898 			IN_ADDRLIST_READER_FOREACH(ia) {
   1899 				if (!(ia->ia_ifp->if_flags & IFF_LOOPBACK))
   1900 					break;
   1901 			}
   1902 			if (ia != NULL)
   1903 				ia4_acquire(ia, psref);
   1904 			pserialize_read_exit(s);
   1905 		} else {
   1906 			/* ia is already referenced by psref */
   1907 			ia = ifatoia(ifa);
   1908 		}
   1909 		if (ia == NULL) {
   1910 			*errorp = EADDRNOTAVAIL;
   1911 			goto out;
   1912 		}
   1913 	}
   1914 	/*
   1915 	 * If the destination address is multicast and an outgoing
   1916 	 * interface has been set as a multicast option, use the
   1917 	 * address of that interface as our source address.
   1918 	 */
   1919 	if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) {
   1920 		struct ip_moptions *imo;
   1921 
   1922 		imo = mopts;
   1923 		if (imo->imo_multicast_if_index != 0) {
   1924 			struct ifnet *ifp;
   1925 			int s;
   1926 
   1927 			if (ia != NULL)
   1928 				ia4_release(ia, psref);
   1929 			s = pserialize_read_enter();
   1930 			ifp = if_byindex(imo->imo_multicast_if_index);
   1931 			if (ifp != NULL) {
   1932 				/* XXX */
   1933 				ia = in_get_ia_from_ifp_psref(ifp, psref);
   1934 			} else
   1935 				ia = NULL;
   1936 			if (ia == NULL || ia->ia4_flags & IN_IFF_NOTREADY) {
   1937 				pserialize_read_exit(s);
   1938 				if (ia != NULL)
   1939 					ia4_release(ia, psref);
   1940 				*errorp = EADDRNOTAVAIL;
   1941 				ia = NULL;
   1942 				goto out;
   1943 			}
   1944 			pserialize_read_exit(s);
   1945 		}
   1946 	}
   1947 	if (ia->ia_ifa.ifa_getifa != NULL) {
   1948 		ia = ifatoia((*ia->ia_ifa.ifa_getifa)(&ia->ia_ifa,
   1949 		                                      sintosa(sin)));
   1950 		if (ia == NULL) {
   1951 			*errorp = EADDRNOTAVAIL;
   1952 			goto out;
   1953 		}
   1954 		/* FIXME NOMPSAFE */
   1955 		ia4_acquire(ia, psref);
   1956 	}
   1957 #ifdef GETIFA_DEBUG
   1958 	else
   1959 		printf("%s: missing ifa_getifa\n", __func__);
   1960 #endif
   1961 out:
   1962 	rtcache_unref(rt, ro);
   1963 	return ia;
   1964 }
   1965 
   1966 int
   1967 in_tunnel_validate(const struct ip *ip, struct in_addr src, struct in_addr dst)
   1968 {
   1969 	struct in_ifaddr *ia4;
   1970 	int s;
   1971 
   1972 	/* check for address match */
   1973 	if (src.s_addr != ip->ip_dst.s_addr ||
   1974 	    dst.s_addr != ip->ip_src.s_addr)
   1975 		return 0;
   1976 
   1977 	/* martian filters on outer source - NOT done in ip_input! */
   1978 	if (IN_MULTICAST(ip->ip_src.s_addr))
   1979 		return 0;
   1980 	switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) {
   1981 	case 0:
   1982 	case 127:
   1983 	case 255:
   1984 		return 0;
   1985 	}
   1986 	/* reject packets with broadcast on source */
   1987 	s = pserialize_read_enter();
   1988 	IN_ADDRLIST_READER_FOREACH(ia4) {
   1989 		if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
   1990 			continue;
   1991 		if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) {
   1992 			pserialize_read_exit(s);
   1993 			return 0;
   1994 		}
   1995 	}
   1996 	pserialize_read_exit(s);
   1997 
   1998 	/* NOTE: packet may dropped by uRPF */
   1999 
   2000 	/* return valid bytes length */
   2001 	return sizeof(src) + sizeof(dst);
   2002 }
   2003 
   2004 #if NARP > 0
   2005 
   2006 #define	IN_LLTBL_DEFAULT_HSIZE	32
   2007 #define	IN_LLTBL_HASH(k, h) \
   2008 	(((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
   2009 
   2010 /*
   2011  * Do actual deallocation of @lle.
   2012  * Called by LLE_FREE_LOCKED when number of references
   2013  * drops to zero.
   2014  */
   2015 static void
   2016 in_lltable_destroy_lle(struct llentry *lle)
   2017 {
   2018 
   2019 	KASSERTMSG(lle->la_numheld == 0, "la_numheld=%d", lle->la_numheld);
   2020 
   2021 	LLE_WUNLOCK(lle);
   2022 	LLE_LOCK_DESTROY(lle);
   2023 	llentry_pool_put(lle);
   2024 }
   2025 
   2026 static struct llentry *
   2027 in_lltable_new(struct in_addr addr4, u_int flags)
   2028 {
   2029 	struct llentry *lle;
   2030 
   2031 	lle = llentry_pool_get(PR_NOWAIT);
   2032 	if (lle == NULL)		/* NB: caller generates msg */
   2033 		return NULL;
   2034 
   2035 	lle->r_l3addr.addr4 = addr4;
   2036 	lle->lle_refcnt = 1;
   2037 	lle->lle_free = in_lltable_destroy_lle;
   2038 	LLE_LOCK_INIT(lle);
   2039 	callout_init(&lle->la_timer, CALLOUT_MPSAFE);
   2040 
   2041 	return lle;
   2042 }
   2043 
   2044 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m)	(			\
   2045 	    (((ntohl((d).s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 )
   2046 
   2047 static int
   2048 in_lltable_match_prefix(const struct sockaddr *prefix,
   2049     const struct sockaddr *mask, u_int flags, struct llentry *lle)
   2050 {
   2051 	const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
   2052 	const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
   2053 	struct in_addr lle_addr;
   2054 
   2055 	lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
   2056 
   2057 	/*
   2058 	 * (flags & LLE_STATIC) means deleting all entries
   2059 	 * including static ARP entries.
   2060 	 */
   2061 	if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, pfx, msk) &&
   2062 	    ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC)))
   2063 		return (1);
   2064 
   2065 	return (0);
   2066 }
   2067 
   2068 static void
   2069 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
   2070 {
   2071 	size_t pkts_dropped;
   2072 
   2073 	LLE_WLOCK_ASSERT(lle);
   2074 	KASSERT(llt != NULL);
   2075 
   2076 	pkts_dropped = llentry_free(lle);
   2077 	arp_stat_add(ARP_STAT_DFRDROPPED, (uint64_t)pkts_dropped);
   2078 }
   2079 
   2080 static int
   2081 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr,
   2082     const struct rtentry *rt)
   2083 {
   2084 	int error = EINVAL;
   2085 
   2086 	if (rt == NULL)
   2087 		return error;
   2088 
   2089 	/*
   2090 	 * If the gateway for an existing host route matches the target L3
   2091 	 * address, which is a special route inserted by some implementation
   2092 	 * such as MANET, and the interface is of the correct type, then
   2093 	 * allow for ARP to proceed.
   2094 	 */
   2095 	if (rt->rt_flags & RTF_GATEWAY) {
   2096 		if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp ||
   2097 		    rt->rt_ifp->if_type != IFT_ETHER ||
   2098 		    (rt->rt_ifp->if_flags & IFF_NOARP) != 0 ||
   2099 		    memcmp(rt->rt_gateway->sa_data, l3addr->sa_data,
   2100 		    sizeof(in_addr_t)) != 0) {
   2101 			goto error;
   2102 		}
   2103 	}
   2104 
   2105 	/*
   2106 	 * Make sure that at least the destination address is covered
   2107 	 * by the route. This is for handling the case where 2 or more
   2108 	 * interfaces have the same prefix. An incoming packet arrives
   2109 	 * on one interface and the corresponding outgoing packet leaves
   2110 	 * another interface.
   2111 	 */
   2112 	if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) {
   2113 		const char *sa, *mask, *addr, *lim;
   2114 		int len;
   2115 
   2116 		mask = (const char *)rt_mask(rt);
   2117 		/*
   2118 		 * Just being extra cautious to avoid some custom
   2119 		 * code getting into trouble.
   2120 		 */
   2121 		if (mask == NULL)
   2122 			goto error;
   2123 
   2124 		sa = (const char *)rt_getkey(rt);
   2125 		addr = (const char *)l3addr;
   2126 		len = ((const struct sockaddr_in *)l3addr)->sin_len;
   2127 		lim = addr + len;
   2128 
   2129 		for ( ; addr < lim; sa++, mask++, addr++) {
   2130 			if ((*sa ^ *addr) & *mask) {
   2131 #ifdef DIAGNOSTIC
   2132 				log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
   2133 				    inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
   2134 #endif
   2135 				goto error;
   2136 			}
   2137 		}
   2138 	}
   2139 
   2140 	error = 0;
   2141 error:
   2142 	return error;
   2143 }
   2144 
   2145 static inline uint32_t
   2146 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
   2147 {
   2148 
   2149 	return (IN_LLTBL_HASH(dst.s_addr, hsize));
   2150 }
   2151 
   2152 static uint32_t
   2153 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
   2154 {
   2155 
   2156 	return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
   2157 }
   2158 
   2159 static void
   2160 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
   2161 {
   2162 	struct sockaddr_in *sin;
   2163 
   2164 	sin = (struct sockaddr_in *)sa;
   2165 	memset(sin, 0, sizeof(*sin));
   2166 	sin->sin_family = AF_INET;
   2167 	sin->sin_len = sizeof(*sin);
   2168 	sin->sin_addr = lle->r_l3addr.addr4;
   2169 }
   2170 
   2171 static inline struct llentry *
   2172 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
   2173 {
   2174 	struct llentry *lle;
   2175 	struct llentries *lleh;
   2176 	u_int hashidx;
   2177 
   2178 	hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
   2179 	lleh = &llt->lle_head[hashidx];
   2180 	LIST_FOREACH(lle, lleh, lle_next) {
   2181 		if (lle->la_flags & LLE_DELETED)
   2182 			continue;
   2183 		if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
   2184 			break;
   2185 	}
   2186 
   2187 	return (lle);
   2188 }
   2189 
   2190 static int
   2191 in_lltable_delete(struct lltable *llt, u_int flags,
   2192     const struct sockaddr *l3addr)
   2193 {
   2194 	const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
   2195 	struct ifnet *ifp __diagused = llt->llt_ifp;
   2196 	struct llentry *lle;
   2197 
   2198 	IF_AFDATA_WLOCK_ASSERT(ifp);
   2199 	KASSERTMSG(l3addr->sa_family == AF_INET,
   2200 	    "sin_family %d", l3addr->sa_family);
   2201 
   2202 	lle = in_lltable_find_dst(llt, sin->sin_addr);
   2203 	if (lle == NULL) {
   2204 #ifdef LLTABLE_DEBUG
   2205 		char buf[64];
   2206 		sockaddr_format(l3addr, buf, sizeof(buf));
   2207 		log(LOG_INFO, "%s: cache for %s is not found\n",
   2208 		    __func__, buf);
   2209 #endif
   2210 		return (ENOENT);
   2211 	}
   2212 
   2213 	LLE_WLOCK(lle);
   2214 #ifdef LLTABLE_DEBUG
   2215 	{
   2216 		char buf[64];
   2217 		sockaddr_format(l3addr, buf, sizeof(buf));
   2218 		log(LOG_INFO, "%s: cache for %s (%p) is deleted\n",
   2219 		    __func__, buf, lle);
   2220 	}
   2221 #endif
   2222 	llentry_free(lle);
   2223 
   2224 	return (0);
   2225 }
   2226 
   2227 static struct llentry *
   2228 in_lltable_create(struct lltable *llt, u_int flags, const struct sockaddr *l3addr,
   2229     const struct rtentry *rt)
   2230 {
   2231 	const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
   2232 	struct ifnet *ifp = llt->llt_ifp;
   2233 	struct llentry *lle;
   2234 
   2235 	IF_AFDATA_WLOCK_ASSERT(ifp);
   2236 	KASSERTMSG(l3addr->sa_family == AF_INET,
   2237 	    "sin_family %d", l3addr->sa_family);
   2238 
   2239 	lle = in_lltable_find_dst(llt, sin->sin_addr);
   2240 
   2241 	if (lle != NULL) {
   2242 		LLE_WLOCK(lle);
   2243 		return (lle);
   2244 	}
   2245 
   2246 	/* no existing record, we need to create new one */
   2247 
   2248 	/*
   2249 	 * A route that covers the given address must have
   2250 	 * been installed 1st because we are doing a resolution,
   2251 	 * verify this.
   2252 	 */
   2253 	if (!(flags & LLE_IFADDR) &&
   2254 	    in_lltable_rtcheck(ifp, flags, l3addr, rt) != 0)
   2255 		return (NULL);
   2256 
   2257 	lle = in_lltable_new(sin->sin_addr, flags);
   2258 	if (lle == NULL) {
   2259 		log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
   2260 		return (NULL);
   2261 	}
   2262 	lle->la_flags = flags;
   2263 	if ((flags & LLE_IFADDR) == LLE_IFADDR) {
   2264 		memcpy(&lle->ll_addr, CLLADDR(ifp->if_sadl), ifp->if_addrlen);
   2265 		lle->la_flags |= (LLE_VALID | LLE_STATIC);
   2266 	}
   2267 
   2268 	lltable_link_entry(llt, lle);
   2269 	LLE_WLOCK(lle);
   2270 
   2271 	return (lle);
   2272 }
   2273 
   2274 /*
   2275  * Return NULL if not found or marked for deletion.
   2276  * If found return lle read locked.
   2277  */
   2278 static struct llentry *
   2279 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
   2280 {
   2281 	const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
   2282 	struct llentry *lle;
   2283 
   2284 	IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
   2285 	KASSERTMSG(l3addr->sa_family == AF_INET,
   2286 	    "sin_family %d", l3addr->sa_family);
   2287 
   2288 	lle = in_lltable_find_dst(llt, sin->sin_addr);
   2289 
   2290 	if (lle == NULL)
   2291 		return NULL;
   2292 
   2293 	if (flags & LLE_EXCLUSIVE)
   2294 		LLE_WLOCK(lle);
   2295 	else
   2296 		LLE_RLOCK(lle);
   2297 
   2298 	return lle;
   2299 }
   2300 
   2301 static int
   2302 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
   2303     struct rt_walkarg *w)
   2304 {
   2305 	struct sockaddr_in sin;
   2306 
   2307 	LLTABLE_LOCK_ASSERT();
   2308 
   2309 	/* skip deleted entries */
   2310 	if (lle->la_flags & LLE_DELETED)
   2311 		return 0;
   2312 
   2313 	sockaddr_in_init(&sin, &lle->r_l3addr.addr4, 0);
   2314 
   2315 	return lltable_dump_entry(llt, lle, w, sintosa(&sin));
   2316 }
   2317 
   2318 #endif /* NARP > 0 */
   2319 
   2320 static int
   2321 in_multicast_sysctl(SYSCTLFN_ARGS)
   2322 {
   2323 	struct ifnet *ifp;
   2324 	struct ifaddr *ifa;
   2325 	struct in_ifaddr *ifa4;
   2326 	struct in_multi *inm;
   2327 	uint32_t tmp;
   2328 	int error;
   2329 	size_t written;
   2330 	struct psref psref;
   2331 	int bound;
   2332 
   2333 	if (namelen != 1)
   2334 		return EINVAL;
   2335 
   2336 	bound = curlwp_bind();
   2337 	ifp = if_get_byindex(name[0], &psref);
   2338 	if (ifp == NULL) {
   2339 		curlwp_bindx(bound);
   2340 		return ENODEV;
   2341 	}
   2342 
   2343 	if (oldp == NULL) {
   2344 		*oldlenp = 0;
   2345 		IFADDR_FOREACH(ifa, ifp) {
   2346 			if (ifa->ifa_addr->sa_family != AF_INET)
   2347 				continue;
   2348 			ifa4 = (void *)ifa;
   2349 			LIST_FOREACH(inm, &ifa4->ia_multiaddrs, inm_list) {
   2350 				*oldlenp += 2 * sizeof(struct in_addr) +
   2351 				    sizeof(uint32_t);
   2352 			}
   2353 		}
   2354 		if_put(ifp, &psref);
   2355 		curlwp_bindx(bound);
   2356 		return 0;
   2357 	}
   2358 
   2359 	error = 0;
   2360 	written = 0;
   2361 	IFADDR_FOREACH(ifa, ifp) {
   2362 		if (ifa->ifa_addr->sa_family != AF_INET)
   2363 			continue;
   2364 		ifa4 = (void *)ifa;
   2365 		LIST_FOREACH(inm, &ifa4->ia_multiaddrs, inm_list) {
   2366 			if (written + 2 * sizeof(struct in_addr) +
   2367 			    sizeof(uint32_t) > *oldlenp)
   2368 				goto done;
   2369 			error = sysctl_copyout(l, &ifa4->ia_addr.sin_addr,
   2370 			    oldp, sizeof(struct in_addr));
   2371 			if (error)
   2372 				goto done;
   2373 			oldp = (char *)oldp + sizeof(struct in_addr);
   2374 			written += sizeof(struct in_addr);
   2375 			error = sysctl_copyout(l, &inm->inm_addr,
   2376 			    oldp, sizeof(struct in_addr));
   2377 			if (error)
   2378 				goto done;
   2379 			oldp = (char *)oldp + sizeof(struct in_addr);
   2380 			written += sizeof(struct in_addr);
   2381 			tmp = inm->inm_refcount;
   2382 			error = sysctl_copyout(l, &tmp, oldp, sizeof(tmp));
   2383 			if (error)
   2384 				goto done;
   2385 			oldp = (char *)oldp + sizeof(tmp);
   2386 			written += sizeof(tmp);
   2387 		}
   2388 	}
   2389 done:
   2390 	if_put(ifp, &psref);
   2391 	curlwp_bindx(bound);
   2392 	*oldlenp = written;
   2393 	return error;
   2394 }
   2395 
   2396 static void
   2397 in_sysctl_init(struct sysctllog **clog)
   2398 {
   2399 	sysctl_createv(clog, 0, NULL, NULL,
   2400 		       CTLFLAG_PERMANENT,
   2401 		       CTLTYPE_NODE, "inet",
   2402 		       SYSCTL_DESCR("PF_INET related settings"),
   2403 		       NULL, 0, NULL, 0,
   2404 		       CTL_NET, PF_INET, CTL_EOL);
   2405 	sysctl_createv(clog, 0, NULL, NULL,
   2406 		       CTLFLAG_PERMANENT,
   2407 		       CTLTYPE_NODE, "multicast",
   2408 		       SYSCTL_DESCR("Multicast information"),
   2409 		       in_multicast_sysctl, 0, NULL, 0,
   2410 		       CTL_NET, PF_INET, CTL_CREATE, CTL_EOL);
   2411 	sysctl_createv(clog, 0, NULL, NULL,
   2412 		       CTLFLAG_PERMANENT,
   2413 		       CTLTYPE_NODE, "ip",
   2414 		       SYSCTL_DESCR("IPv4 related settings"),
   2415 		       NULL, 0, NULL, 0,
   2416 		       CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
   2417 
   2418 	sysctl_createv(clog, 0, NULL, NULL,
   2419 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   2420 		       CTLTYPE_INT, "subnetsarelocal",
   2421 		       SYSCTL_DESCR("Whether logical subnets are considered "
   2422 				    "local"),
   2423 		       NULL, 0, &subnetsarelocal, 0,
   2424 		       CTL_NET, PF_INET, IPPROTO_IP,
   2425 		       IPCTL_SUBNETSARELOCAL, CTL_EOL);
   2426 	sysctl_createv(clog, 0, NULL, NULL,
   2427 		       CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
   2428 		       CTLTYPE_INT, "hostzerobroadcast",
   2429 		       SYSCTL_DESCR("All zeroes address is broadcast address"),
   2430 		       NULL, 0, &hostzeroisbroadcast, 0,
   2431 		       CTL_NET, PF_INET, IPPROTO_IP,
   2432 		       IPCTL_HOSTZEROBROADCAST, CTL_EOL);
   2433 }
   2434 
   2435 #if NARP > 0
   2436 
   2437 static struct lltable *
   2438 in_lltattach(struct ifnet *ifp, struct in_ifinfo *ii)
   2439 {
   2440 	struct lltable *llt;
   2441 
   2442 	llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
   2443 	llt->llt_af = AF_INET;
   2444 	llt->llt_ifp = ifp;
   2445 
   2446 	llt->llt_lookup = in_lltable_lookup;
   2447 	llt->llt_create = in_lltable_create;
   2448 	llt->llt_delete = in_lltable_delete;
   2449 	llt->llt_dump_entry = in_lltable_dump_entry;
   2450 	llt->llt_hash = in_lltable_hash;
   2451 	llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
   2452 	llt->llt_free_entry = in_lltable_free_entry;
   2453 	llt->llt_match_prefix = in_lltable_match_prefix;
   2454 #ifdef MBUFTRACE
   2455 	struct mowner *mowner = &ii->ii_mowner;
   2456 	mowner_init_owner(mowner, ifp->if_xname, "arp");
   2457 	MOWNER_ATTACH(mowner);
   2458 	llt->llt_mowner = mowner;
   2459 #endif
   2460 	lltable_link(llt);
   2461 
   2462 	return (llt);
   2463 }
   2464 
   2465 #endif /* NARP > 0 */
   2466 
   2467 void *
   2468 in_domifattach(struct ifnet *ifp)
   2469 {
   2470 	struct in_ifinfo *ii;
   2471 
   2472 	ii = kmem_zalloc(sizeof(struct in_ifinfo), KM_SLEEP);
   2473 
   2474 #if NARP > 0
   2475 	ii->ii_llt = in_lltattach(ifp, ii);
   2476 #endif
   2477 
   2478 #ifdef IPSELSRC
   2479 	ii->ii_selsrc = in_selsrc_domifattach(ifp);
   2480 	KASSERT(ii->ii_selsrc != NULL);
   2481 #endif
   2482 
   2483 	return ii;
   2484 }
   2485 
   2486 void
   2487 in_domifdetach(struct ifnet *ifp, void *aux)
   2488 {
   2489 	struct in_ifinfo *ii = aux;
   2490 
   2491 #ifdef IPSELSRC
   2492 	in_selsrc_domifdetach(ifp, ii->ii_selsrc);
   2493 #endif
   2494 #if NARP > 0
   2495 	lltable_free(ii->ii_llt);
   2496 #ifdef MBUFTRACE
   2497 	MOWNER_DETACH(&ii->ii_mowner);
   2498 #endif
   2499 #endif
   2500 	kmem_free(ii, sizeof(struct in_ifinfo));
   2501 }
   2502