1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (C) 2001 WIDE Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 #include "opt_inet.h"
35
36 #define IN_HISTORICAL_NETS /* include class masks */
37
38 #include <sys/param.h>
39 #include <sys/eventhandler.h>
40 #include <sys/systm.h>
41 #include <sys/sockio.h>
42 #include <sys/malloc.h>
43 #include <sys/priv.h>
44 #include <sys/socket.h>
45 #include <sys/jail.h>
46 #include <sys/kernel.h>
47 #include <sys/lock.h>
48 #include <sys/proc.h>
49 #include <sys/sysctl.h>
50 #include <sys/syslog.h>
51 #include <sys/sx.h>
52
53 #include <net/if.h>
54 #include <net/if_var.h>
55 #include <net/if_arp.h>
56 #include <net/if_dl.h>
57 #include <net/if_llatbl.h>
58 #include <net/if_private.h>
59 #include <net/if_types.h>
60 #include <net/route.h>
61 #include <net/route/nhop.h>
62 #include <net/route/route_ctl.h>
63 #include <net/vnet.h>
64
65 #include <netinet/if_ether.h>
66 #include <netinet/in.h>
67 #include <netinet/in_fib.h>
68 #include <netinet/in_var.h>
69 #include <netinet/in_pcb.h>
70 #include <netinet/ip_var.h>
71 #include <netinet/ip_carp.h>
72 #include <netinet/igmp_var.h>
73 #include <netinet/udp.h>
74 #include <netinet/udp_var.h>
75
76 #ifdef MAC
77 #include <security/mac/mac_framework.h>
78 #endif
79
80 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
81 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
82 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
83
84 static void in_socktrim(struct sockaddr_in *);
85 static void in_purgemaddrs(struct ifnet *);
86
87 static bool ia_need_loopback_route(const struct in_ifaddr *);
88
89 VNET_DEFINE_STATIC(int, nosameprefix);
90 #define V_nosameprefix VNET(nosameprefix)
91 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
92 &VNET_NAME(nosameprefix), 0,
93 "Refuse to create same prefixes on different interfaces");
94
95 VNET_DEFINE_STATIC(bool, broadcast_lowest);
96 #define V_broadcast_lowest VNET(broadcast_lowest)
97 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, broadcast_lowest, CTLFLAG_VNET | CTLFLAG_RW,
98 &VNET_NAME(broadcast_lowest), 0,
99 "Treat lowest address on a subnet (host 0) as broadcast");
100
101 VNET_DEFINE(bool, ip_allow_net240) = false;
102 #define V_ip_allow_net240 VNET(ip_allow_net240)
103 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net240,
104 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net240), 0,
105 "Allow use of Experimental addresses, aka Class E (240/4)");
106 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-240 */
107
108 VNET_DEFINE(bool, ip_allow_net0) = false;
109 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net0,
110 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net0), 0,
111 "Allow use of addresses in network 0/8");
112 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-0 */
113
114 VNET_DEFINE(uint32_t, in_loopback_mask) = IN_LOOPBACK_MASK_DFLT;
115 #define V_in_loopback_mask VNET(in_loopback_mask)
116 static int sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS);
117 SYSCTL_PROC(_net_inet_ip, OID_AUTO, loopback_prefixlen,
118 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
119 NULL, 0, sysctl_loopback_prefixlen, "I",
120 "Prefix length of address space reserved for loopback");
121 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-127 */
122
123 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
124 #define V_ripcbinfo VNET(ripcbinfo)
125
126 static struct sx in_control_sx;
127 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
128
129 /*
130 * Return 1 if an internet address is for a ``local'' host
131 * (one to which we have a connection).
132 */
133 int
in_localaddr(struct in_addr in)134 in_localaddr(struct in_addr in)
135 {
136 u_long i = ntohl(in.s_addr);
137 struct in_ifaddr *ia;
138
139 NET_EPOCH_ASSERT();
140
141 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
142 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
143 return (1);
144 }
145
146 return (0);
147 }
148
149 /*
150 * Return 1 if an internet address is for the local host and configured
151 * on one of its interfaces.
152 */
153 bool
in_localip(struct in_addr in)154 in_localip(struct in_addr in)
155 {
156 struct in_ifaddr *ia;
157
158 NET_EPOCH_ASSERT();
159
160 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
161 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr)
162 return (true);
163
164 return (false);
165 }
166
167 /*
168 * Like in_localip(), but FIB-aware and carp(4)-aware.
169 */
170 bool
in_localip_fib(struct in_addr in,uint16_t fib)171 in_localip_fib(struct in_addr in, uint16_t fib)
172 {
173 struct in_ifaddr *ia;
174
175 NET_EPOCH_ASSERT();
176
177 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
178 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr &&
179 (ia->ia_ifa.ifa_carp == NULL ||
180 carp_master_p(&ia->ia_ifa)) &&
181 ia->ia_ifa.ifa_ifp->if_fib == fib)
182 return (true);
183
184 return (false);
185 }
186
187 /*
188 * Return 1 if an internet address is configured on an interface.
189 */
190 int
in_ifhasaddr(struct ifnet * ifp,struct in_addr in)191 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
192 {
193 struct ifaddr *ifa;
194 struct in_ifaddr *ia;
195
196 NET_EPOCH_ASSERT();
197
198 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
199 if (ifa->ifa_addr->sa_family != AF_INET)
200 continue;
201 ia = (struct in_ifaddr *)ifa;
202 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
203 return (1);
204 }
205
206 return (0);
207 }
208
209 /*
210 * Return a reference to the interface address which is different to
211 * the supplied one but with same IP address value.
212 */
213 static struct in_ifaddr *
in_localip_more(struct in_ifaddr * original_ia)214 in_localip_more(struct in_ifaddr *original_ia)
215 {
216 struct epoch_tracker et;
217 in_addr_t original_addr = IA_SIN(original_ia)->sin_addr.s_addr;
218 uint32_t original_fib = original_ia->ia_ifa.ifa_ifp->if_fib;
219 struct in_ifaddr *ia;
220
221 NET_EPOCH_ENTER(et);
222 CK_LIST_FOREACH(ia, INADDR_HASH(original_addr), ia_hash) {
223 in_addr_t addr = IA_SIN(ia)->sin_addr.s_addr;
224 uint32_t fib = ia->ia_ifa.ifa_ifp->if_fib;
225 if (!V_rt_add_addr_allfibs && (original_fib != fib))
226 continue;
227 if ((original_ia != ia) && (original_addr == addr)) {
228 ifa_ref(&ia->ia_ifa);
229 NET_EPOCH_EXIT(et);
230 return (ia);
231 }
232 }
233 NET_EPOCH_EXIT(et);
234
235 return (NULL);
236 }
237
238 /*
239 * Tries to find first IPv4 address in the provided fib.
240 * Prefers non-loopback addresses and return loopback IFF
241 * @loopback_ok is set.
242 *
243 * Returns ifa or NULL.
244 */
245 struct in_ifaddr *
in_findlocal(uint32_t fibnum,bool loopback_ok)246 in_findlocal(uint32_t fibnum, bool loopback_ok)
247 {
248 struct in_ifaddr *ia = NULL, *ia_lo = NULL;
249
250 NET_EPOCH_ASSERT();
251
252 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
253 uint32_t ia_fib = ia->ia_ifa.ifa_ifp->if_fib;
254 if (!V_rt_add_addr_allfibs && (fibnum != ia_fib))
255 continue;
256
257 if (!IN_LOOPBACK(ntohl(IA_SIN(ia)->sin_addr.s_addr)))
258 break;
259 if (loopback_ok)
260 ia_lo = ia;
261 }
262
263 if (ia == NULL)
264 ia = ia_lo;
265
266 return (ia);
267 }
268
269 /*
270 * Determine whether an IP address is in a reserved set of addresses
271 * that may not be forwarded, or whether datagrams to that destination
272 * may be forwarded.
273 */
274 int
in_canforward(struct in_addr in)275 in_canforward(struct in_addr in)
276 {
277 u_long i = ntohl(in.s_addr);
278
279 if (IN_MULTICAST(i) || IN_LINKLOCAL(i) || IN_LOOPBACK(i))
280 return (0);
281 if (IN_EXPERIMENTAL(i) && !V_ip_allow_net240)
282 return (0);
283 if (IN_ZERONET(i) && !V_ip_allow_net0)
284 return (0);
285 return (1);
286 }
287
288 /*
289 * Sysctl to manage prefix of reserved loopback network; translate
290 * to/from mask. The mask is always contiguous high-order 1 bits
291 * followed by all 0 bits.
292 */
293 static int
sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)294 sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)
295 {
296 int error, preflen;
297
298 /* ffs is 1-based; compensate. */
299 preflen = 33 - ffs(V_in_loopback_mask);
300 error = sysctl_handle_int(oidp, &preflen, 0, req);
301 if (error || !req->newptr)
302 return (error);
303 if (preflen < 8 || preflen > 31)
304 return (EINVAL);
305 V_in_loopback_mask = 0xffffffff << (32 - preflen);
306 return (0);
307 }
308
309 /*
310 * Trim a mask in a sockaddr
311 */
312 static void
in_socktrim(struct sockaddr_in * ap)313 in_socktrim(struct sockaddr_in *ap)
314 {
315 char *cplim = (char *) &ap->sin_addr;
316 char *cp = (char *) (&ap->sin_addr + 1);
317
318 ap->sin_len = 0;
319 while (--cp >= cplim)
320 if (*cp) {
321 (ap)->sin_len = cp - (char *) (ap) + 1;
322 break;
323 }
324 }
325
326 /*
327 * Generic internet control operations (ioctl's).
328 */
329 int
in_control_ioctl(u_long cmd,void * data,struct ifnet * ifp,struct ucred * cred)330 in_control_ioctl(u_long cmd, void *data, struct ifnet *ifp,
331 struct ucred *cred)
332 {
333 struct ifreq *ifr = (struct ifreq *)data;
334 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
335 struct epoch_tracker et;
336 struct ifaddr *ifa;
337 struct in_ifaddr *ia;
338 int error;
339
340 if (ifp == NULL)
341 return (EADDRNOTAVAIL);
342
343 /*
344 * Filter out 4 ioctls we implement directly. Forward the rest
345 * to specific functions and ifp->if_ioctl().
346 */
347 switch (cmd) {
348 case SIOCGIFADDR:
349 case SIOCGIFBRDADDR:
350 case SIOCGIFDSTADDR:
351 case SIOCGIFNETMASK:
352 break;
353 case SIOCGIFALIAS:
354 sx_xlock(&in_control_sx);
355 error = in_gifaddr_ioctl(cmd, data, ifp, cred);
356 sx_xunlock(&in_control_sx);
357 return (error);
358 case SIOCDIFADDR:
359 sx_xlock(&in_control_sx);
360 error = in_difaddr_ioctl(cmd, data, ifp, cred);
361 sx_xunlock(&in_control_sx);
362 return (error);
363 case OSIOCAIFADDR: /* 9.x compat */
364 case SIOCAIFADDR:
365 sx_xlock(&in_control_sx);
366 error = in_aifaddr_ioctl(cmd, data, ifp, cred);
367 sx_xunlock(&in_control_sx);
368 return (error);
369 case SIOCSIFADDR:
370 case SIOCSIFBRDADDR:
371 case SIOCSIFDSTADDR:
372 case SIOCSIFNETMASK:
373 /* We no longer support that old commands. */
374 return (EINVAL);
375 default:
376 if (ifp->if_ioctl == NULL)
377 return (EOPNOTSUPP);
378 return ((*ifp->if_ioctl)(ifp, cmd, data));
379 }
380
381 if (addr->sin_addr.s_addr != INADDR_ANY &&
382 prison_check_ip4(cred, &addr->sin_addr) != 0)
383 return (EADDRNOTAVAIL);
384
385 /*
386 * Find address for this interface, if it exists. If an
387 * address was specified, find that one instead of the
388 * first one on the interface, if possible.
389 */
390 NET_EPOCH_ENTER(et);
391 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
392 if (ifa->ifa_addr->sa_family != AF_INET)
393 continue;
394 ia = (struct in_ifaddr *)ifa;
395 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
396 break;
397 }
398 if (ifa == NULL)
399 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
400 if (ifa->ifa_addr->sa_family == AF_INET) {
401 ia = (struct in_ifaddr *)ifa;
402 if (prison_check_ip4(cred,
403 &ia->ia_addr.sin_addr) == 0)
404 break;
405 }
406
407 if (ifa == NULL) {
408 NET_EPOCH_EXIT(et);
409 return (EADDRNOTAVAIL);
410 }
411
412 error = 0;
413 switch (cmd) {
414 case SIOCGIFADDR:
415 *addr = ia->ia_addr;
416 break;
417
418 case SIOCGIFBRDADDR:
419 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
420 error = EINVAL;
421 break;
422 }
423 *addr = ia->ia_broadaddr;
424 break;
425
426 case SIOCGIFDSTADDR:
427 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
428 error = EINVAL;
429 break;
430 }
431 *addr = ia->ia_dstaddr;
432 break;
433
434 case SIOCGIFNETMASK:
435 *addr = ia->ia_sockmask;
436 break;
437 }
438
439 NET_EPOCH_EXIT(et);
440
441 return (error);
442 }
443
444 int
in_control(struct socket * so,u_long cmd,void * data,struct ifnet * ifp,struct thread * td)445 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp,
446 struct thread *td)
447 {
448 return (in_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
449 }
450
451 static int
in_aifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)452 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
453 {
454 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
455 const struct sockaddr_in *addr = &ifra->ifra_addr;
456 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
457 const struct sockaddr_in *mask = &ifra->ifra_mask;
458 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
459 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
460 struct epoch_tracker et;
461 struct ifaddr *ifa;
462 struct in_ifaddr *ia;
463 bool iaIsFirst;
464 int error = 0;
465
466 error = priv_check_cred(cred, PRIV_NET_ADDIFADDR);
467 if (error)
468 return (error);
469
470 /*
471 * ifra_addr must be present and be of INET family.
472 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
473 */
474 if (addr->sin_len != sizeof(struct sockaddr_in) ||
475 addr->sin_family != AF_INET)
476 return (EINVAL);
477 if (broadaddr->sin_len != 0 &&
478 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
479 broadaddr->sin_family != AF_INET))
480 return (EINVAL);
481 if (mask->sin_len != 0 &&
482 (mask->sin_len != sizeof(struct sockaddr_in) ||
483 mask->sin_family != AF_INET))
484 return (EINVAL);
485 if ((ifp->if_flags & IFF_POINTOPOINT) &&
486 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
487 dstaddr->sin_addr.s_addr == INADDR_ANY))
488 return (EDESTADDRREQ);
489 if (vhid != 0 && carp_attach_p == NULL)
490 return (EPROTONOSUPPORT);
491
492 #ifdef MAC
493 /* Check if a MAC policy disallows setting the IPv4 address. */
494 error = mac_inet_check_add_addr(cred, &addr->sin_addr, ifp);
495 if (error != 0)
496 return (error);
497 #endif
498
499 /*
500 * See whether address already exist.
501 */
502 iaIsFirst = true;
503 ia = NULL;
504 NET_EPOCH_ENTER(et);
505 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
506 struct in_ifaddr *it;
507
508 if (ifa->ifa_addr->sa_family != AF_INET)
509 continue;
510
511 it = (struct in_ifaddr *)ifa;
512 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
513 prison_check_ip4(cred, &addr->sin_addr) == 0)
514 ia = it;
515 else
516 iaIsFirst = false;
517 }
518 NET_EPOCH_EXIT(et);
519
520 if (ia != NULL)
521 (void )in_difaddr_ioctl(cmd, data, ifp, cred);
522
523 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
524 ia = (struct in_ifaddr *)ifa;
525 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
526 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
527 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
528 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
529 CALLOUT_RETURNUNLOCKED);
530
531 ia->ia_ifp = ifp;
532 ia->ia_addr = *addr;
533 if (mask->sin_len != 0) {
534 ia->ia_sockmask = *mask;
535 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
536 } else {
537 in_addr_t i = ntohl(addr->sin_addr.s_addr);
538
539 /*
540 * If netmask isn't supplied, use historical default.
541 * This is deprecated for interfaces other than loopback
542 * or point-to-point; warn in other cases. In the future
543 * we should return an error rather than warning.
544 */
545 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0)
546 printf("%s: set address: WARNING: network mask "
547 "should be specified; using historical default\n",
548 ifp->if_xname);
549 if (IN_CLASSA(i))
550 ia->ia_subnetmask = IN_CLASSA_NET;
551 else if (IN_CLASSB(i))
552 ia->ia_subnetmask = IN_CLASSB_NET;
553 else
554 ia->ia_subnetmask = IN_CLASSC_NET;
555 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
556 }
557 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
558 in_socktrim(&ia->ia_sockmask);
559
560 if (ifp->if_flags & IFF_BROADCAST) {
561 if (broadaddr->sin_len != 0) {
562 ia->ia_broadaddr = *broadaddr;
563 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
564 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
565 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
566 ia->ia_broadaddr.sin_family = AF_INET;
567 } else {
568 ia->ia_broadaddr.sin_addr.s_addr =
569 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
570 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
571 ia->ia_broadaddr.sin_family = AF_INET;
572 }
573 }
574
575 if (ifp->if_flags & IFF_POINTOPOINT)
576 ia->ia_dstaddr = *dstaddr;
577
578 if (vhid != 0) {
579 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
580 if (error)
581 return (error);
582 }
583
584 /* if_addrhead is already referenced by ifa_alloc() */
585 IF_ADDR_WLOCK(ifp);
586 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
587 IF_ADDR_WUNLOCK(ifp);
588
589 ifa_ref(ifa); /* in_ifaddrhead */
590 sx_assert(&in_control_sx, SA_XLOCKED);
591 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
592 CK_LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia,
593 ia_hash);
594
595 /*
596 * Give the interface a chance to initialize
597 * if this is its first address,
598 * and to validate the address if necessary.
599 */
600 if (ifp->if_ioctl != NULL) {
601 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
602 if (error)
603 goto fail1;
604 }
605
606 /*
607 * Add route for the network.
608 */
609 if (vhid == 0) {
610 error = in_addprefix(ia);
611 if (error)
612 goto fail1;
613 }
614
615 /*
616 * Add a loopback route to self.
617 */
618 if (vhid == 0 && ia_need_loopback_route(ia)) {
619 struct in_ifaddr *eia;
620
621 eia = in_localip_more(ia);
622
623 if (eia == NULL) {
624 error = ifa_add_loopback_route((struct ifaddr *)ia,
625 (struct sockaddr *)&ia->ia_addr);
626 if (error)
627 goto fail2;
628 } else
629 ifa_free(&eia->ia_ifa);
630 }
631
632 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
633 struct in_addr allhosts_addr;
634 struct in_ifinfo *ii;
635
636 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
637 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
638
639 error = in_joingroup(ifp, &allhosts_addr, NULL,
640 &ii->ii_allhosts);
641 }
642
643 /*
644 * Note: we don't need extra reference for ifa, since we called
645 * with sx lock held, and ifaddr can not be deleted in concurrent
646 * thread.
647 */
648 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
649
650 return (error);
651
652 fail2:
653 if (vhid == 0)
654 (void )in_scrubprefix(ia, LLE_STATIC);
655
656 fail1:
657 if (ia->ia_ifa.ifa_carp)
658 (*carp_detach_p)(&ia->ia_ifa, false);
659
660 IF_ADDR_WLOCK(ifp);
661 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
662 IF_ADDR_WUNLOCK(ifp);
663 ifa_free(&ia->ia_ifa); /* if_addrhead */
664
665 sx_assert(&in_control_sx, SA_XLOCKED);
666 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
667 CK_LIST_REMOVE(ia, ia_hash);
668 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
669
670 return (error);
671 }
672
673 static int
in_difaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)674 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
675 {
676 const struct ifreq *ifr = (struct ifreq *)data;
677 const struct sockaddr_in *addr = (const struct sockaddr_in *)
678 &ifr->ifr_addr;
679 struct ifaddr *ifa;
680 struct in_ifaddr *ia;
681 bool deleteAny, iaIsLast;
682 int error;
683
684 if (cred != NULL) {
685 error = priv_check_cred(cred, PRIV_NET_DELIFADDR);
686 if (error)
687 return (error);
688 }
689
690 if (addr->sin_len != sizeof(struct sockaddr_in) ||
691 addr->sin_family != AF_INET)
692 deleteAny = true;
693 else
694 deleteAny = false;
695
696 iaIsLast = true;
697 ia = NULL;
698 IF_ADDR_WLOCK(ifp);
699 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
700 struct in_ifaddr *it;
701
702 if (ifa->ifa_addr->sa_family != AF_INET)
703 continue;
704
705 it = (struct in_ifaddr *)ifa;
706 if (deleteAny && ia == NULL && (cred == NULL ||
707 prison_check_ip4(cred, &it->ia_addr.sin_addr) == 0))
708 ia = it;
709
710 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
711 (cred == NULL || prison_check_ip4(cred,
712 &addr->sin_addr) == 0))
713 ia = it;
714
715 if (it != ia)
716 iaIsLast = false;
717 }
718
719 if (ia == NULL) {
720 IF_ADDR_WUNLOCK(ifp);
721 return (EADDRNOTAVAIL);
722 }
723
724 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
725 IF_ADDR_WUNLOCK(ifp);
726 ifa_free(&ia->ia_ifa); /* if_addrhead */
727
728 sx_assert(&in_control_sx, SA_XLOCKED);
729 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
730 CK_LIST_REMOVE(ia, ia_hash);
731
732 /*
733 * in_scrubprefix() kills the interface route.
734 */
735 in_scrubprefix(ia, LLE_STATIC);
736
737 /*
738 * in_ifadown gets rid of all the rest of
739 * the routes. This is not quite the right
740 * thing to do, but at least if we are running
741 * a routing process they will come back.
742 */
743 in_ifadown(&ia->ia_ifa, 1);
744
745 if (ia->ia_ifa.ifa_carp)
746 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
747
748 /*
749 * If this is the last IPv4 address configured on this
750 * interface, leave the all-hosts group.
751 * No state-change report need be transmitted.
752 */
753 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
754 struct in_ifinfo *ii;
755
756 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
757 if (ii->ii_allhosts) {
758 (void)in_leavegroup(ii->ii_allhosts, NULL);
759 ii->ii_allhosts = NULL;
760 }
761 }
762
763 IF_ADDR_WLOCK(ifp);
764 if (callout_stop(&ia->ia_garp_timer) == 1) {
765 ifa_free(&ia->ia_ifa);
766 }
767 IF_ADDR_WUNLOCK(ifp);
768
769 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
770 IFADDR_EVENT_DEL);
771 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
772
773 return (0);
774 }
775
776 static int
in_gifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)777 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
778 {
779 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
780 const struct sockaddr_in *addr = &ifra->ifra_addr;
781 struct epoch_tracker et;
782 struct ifaddr *ifa;
783 struct in_ifaddr *ia;
784
785 /*
786 * ifra_addr must be present and be of INET family.
787 */
788 if (addr->sin_len != sizeof(struct sockaddr_in) ||
789 addr->sin_family != AF_INET)
790 return (EINVAL);
791
792 /*
793 * See whether address exist.
794 */
795 ia = NULL;
796 NET_EPOCH_ENTER(et);
797 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
798 struct in_ifaddr *it;
799
800 if (ifa->ifa_addr->sa_family != AF_INET)
801 continue;
802
803 it = (struct in_ifaddr *)ifa;
804 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
805 prison_check_ip4(cred, &addr->sin_addr) == 0) {
806 ia = it;
807 break;
808 }
809 }
810 if (ia == NULL) {
811 NET_EPOCH_EXIT(et);
812 return (EADDRNOTAVAIL);
813 }
814
815 ifra->ifra_mask = ia->ia_sockmask;
816 if ((ifp->if_flags & IFF_POINTOPOINT) &&
817 ia->ia_dstaddr.sin_family == AF_INET)
818 ifra->ifra_dstaddr = ia->ia_dstaddr;
819 else if ((ifp->if_flags & IFF_BROADCAST) &&
820 ia->ia_broadaddr.sin_family == AF_INET)
821 ifra->ifra_broadaddr = ia->ia_broadaddr;
822 else
823 memset(&ifra->ifra_broadaddr, 0,
824 sizeof(ifra->ifra_broadaddr));
825
826 NET_EPOCH_EXIT(et);
827 return (0);
828 }
829
830 static int
in_match_ifaddr(const struct rtentry * rt,const struct nhop_object * nh,void * arg)831 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
832 {
833
834 if (nh->nh_ifa == (struct ifaddr *)arg)
835 return (1);
836
837 return (0);
838 }
839
840 static int
in_handle_prefix_route(uint32_t fibnum,int cmd,struct sockaddr_in * dst,struct sockaddr_in * netmask,struct ifaddr * ifa,struct ifnet * ifp)841 in_handle_prefix_route(uint32_t fibnum, int cmd,
842 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa,
843 struct ifnet *ifp)
844 {
845
846 NET_EPOCH_ASSERT();
847
848 /* Prepare gateway */
849 struct sockaddr_dl_short sdl = {
850 .sdl_family = AF_LINK,
851 .sdl_len = sizeof(struct sockaddr_dl_short),
852 .sdl_type = ifa->ifa_ifp->if_type,
853 .sdl_index = ifa->ifa_ifp->if_index,
854 };
855
856 struct rt_addrinfo info = {
857 .rti_ifa = ifa,
858 .rti_ifp = ifp,
859 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
860 .rti_info = {
861 [RTAX_DST] = (struct sockaddr *)dst,
862 [RTAX_NETMASK] = (struct sockaddr *)netmask,
863 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
864 },
865 /* Ensure we delete the prefix IFF prefix ifa matches */
866 .rti_filter = in_match_ifaddr,
867 .rti_filterdata = ifa,
868 };
869
870 return (rib_handle_ifaddr_info(fibnum, cmd, &info));
871 }
872
873 /*
874 * Routing table interaction with interface addresses.
875 *
876 * In general, two types of routes needs to be installed:
877 * a) "interface" or "prefix" route, telling user that the addresses
878 * behind the ifa prefix are reached directly.
879 * b) "loopback" route installed for the ifa address, telling user that
880 * the address belongs to local system.
881 *
882 * Handling for (a) and (b) differs in multi-fib aspects, hence they
883 * are implemented in different functions below.
884 *
885 * The cases above may intersect - /32 interface aliases results in
886 * the same prefix produced by (a) and (b). This blurs the definition
887 * of the "loopback" route and complicate interactions. The interaction
888 * table is defined below. The case numbers are used in the multiple
889 * functions below to refer to the particular test case.
890 *
891 * There can be multiple options:
892 * 1) Adding address with prefix on non-p2p/non-loopback interface.
893 * Example: 192.0.2.1/24. Action:
894 * * add "prefix" route towards 192.0.2.0/24 via @ia interface,
895 * using @ia as an address source.
896 * * add "loopback" route towards 192.0.2.1 via V_loif, saving
897 * @ia ifp in the gateway and using @ia as an address source.
898 *
899 * 2) Adding address with /32 mask to non-p2p/non-loopback interface.
900 * Example: 192.0.2.2/32. Action:
901 * * add "prefix" host route via V_loif, using @ia as an address source.
902 *
903 * 3) Adding address with or without prefix to p2p interface.
904 * Example: 10.0.0.1/24->10.0.0.2. Action:
905 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia
906 * as an address source. Note: no sense in installing full /24 as the interface
907 * is point-to-point.
908 * * add "loopback" route towards 10.0.9.1 via V_loif, saving
909 * @ia ifp in the gateway and using @ia as an address source.
910 *
911 * 4) Adding address with or without prefix to loopback interface.
912 * Example: 192.0.2.1/24. Action:
913 * * add "prefix" host route via @ia interface, using @ia as an address source.
914 * Note: Skip installing /24 prefix as it would introduce TTL loop
915 * for the traffic destined to these addresses.
916 */
917
918 /*
919 * Checks if @ia needs to install loopback route to @ia address via
920 * ifa_maintain_loopback_route().
921 *
922 * Return true on success.
923 */
924 static bool
ia_need_loopback_route(const struct in_ifaddr * ia)925 ia_need_loopback_route(const struct in_ifaddr *ia)
926 {
927 struct ifnet *ifp = ia->ia_ifp;
928
929 /* Case 4: Skip loopback interfaces */
930 if ((ifp->if_flags & IFF_LOOPBACK) ||
931 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY))
932 return (false);
933
934 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */
935 if ((ifp->if_flags & IFF_POINTOPOINT) &&
936 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
937 return (false);
938
939 /* Case 2: skip /32 prefixes */
940 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
941 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST))
942 return (false);
943
944 return (true);
945 }
946
947 /*
948 * Calculate "prefix" route corresponding to @ia.
949 */
950 static void
ia_getrtprefix(const struct in_ifaddr * ia,struct in_addr * prefix,struct in_addr * mask)951 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask)
952 {
953
954 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) {
955 /* Case 3: return host route for dstaddr */
956 *prefix = ia->ia_dstaddr.sin_addr;
957 mask->s_addr = INADDR_BROADCAST;
958 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) {
959 /* Case 4: return host route for ifaddr */
960 *prefix = ia->ia_addr.sin_addr;
961 mask->s_addr = INADDR_BROADCAST;
962 } else {
963 /* Cases 1,2: return actual ia prefix */
964 *prefix = ia->ia_addr.sin_addr;
965 *mask = ia->ia_sockmask.sin_addr;
966 prefix->s_addr &= mask->s_addr;
967 }
968 }
969
970 /*
971 * Adds or delete interface "prefix" route corresponding to @ifa.
972 * Returns 0 on success or errno.
973 */
974 static int
in_handle_ifaddr_route(int cmd,struct in_ifaddr * ia)975 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia)
976 {
977 struct ifaddr *ifa = &ia->ia_ifa;
978 struct in_addr daddr, maddr;
979 struct sockaddr_in *pmask;
980 struct epoch_tracker et;
981 int error;
982
983 ia_getrtprefix(ia, &daddr, &maddr);
984
985 struct sockaddr_in mask = {
986 .sin_family = AF_INET,
987 .sin_len = sizeof(struct sockaddr_in),
988 .sin_addr = maddr,
989 };
990
991 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL;
992
993 struct sockaddr_in dst = {
994 .sin_family = AF_INET,
995 .sin_len = sizeof(struct sockaddr_in),
996 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr,
997 };
998
999 struct ifnet *ifp = ia->ia_ifp;
1000
1001 if ((maddr.s_addr == INADDR_BROADCAST) &&
1002 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) {
1003 /* Case 2: host route on broadcast interface */
1004 ifp = V_loif;
1005 }
1006
1007 uint32_t fibnum = ifa->ifa_ifp->if_fib;
1008 NET_EPOCH_ENTER(et);
1009 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp);
1010 NET_EPOCH_EXIT(et);
1011
1012 return (error);
1013 }
1014
1015 /*
1016 * Check if we have a route for the given prefix already.
1017 */
1018 static bool
in_hasrtprefix(struct in_ifaddr * target)1019 in_hasrtprefix(struct in_ifaddr *target)
1020 {
1021 struct epoch_tracker et;
1022 struct in_ifaddr *ia;
1023 struct in_addr prefix, mask, p, m;
1024 bool result = false;
1025
1026 ia_getrtprefix(target, &prefix, &mask);
1027
1028 /* Look for an existing address with the same prefix, mask, and fib */
1029 NET_EPOCH_ENTER(et);
1030 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1031 ia_getrtprefix(ia, &p, &m);
1032
1033 if (prefix.s_addr != p.s_addr ||
1034 mask.s_addr != m.s_addr)
1035 continue;
1036
1037 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
1038 continue;
1039
1040 /*
1041 * If we got a matching prefix route inserted by other
1042 * interface address, we are done here.
1043 */
1044 if (ia->ia_flags & IFA_ROUTE) {
1045 result = true;
1046 break;
1047 }
1048 }
1049 NET_EPOCH_EXIT(et);
1050
1051 return (result);
1052 }
1053
1054 int
in_addprefix(struct in_ifaddr * target)1055 in_addprefix(struct in_ifaddr *target)
1056 {
1057 int error;
1058
1059 if (in_hasrtprefix(target)) {
1060 if (V_nosameprefix)
1061 return (EEXIST);
1062 else {
1063 rt_addrmsg(RTM_ADD, &target->ia_ifa,
1064 target->ia_ifp->if_fib);
1065 return (0);
1066 }
1067 }
1068
1069 /*
1070 * No-one seem to have this prefix route, so we try to insert it.
1071 */
1072 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib);
1073 error = in_handle_ifaddr_route(RTM_ADD, target);
1074 if (!error)
1075 target->ia_flags |= IFA_ROUTE;
1076 return (error);
1077 }
1078
1079 /*
1080 * Removes either all lle entries for given @ia, or lle
1081 * corresponding to @ia address.
1082 */
1083 static void
in_scrubprefixlle(struct in_ifaddr * ia,int all,u_int flags)1084 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
1085 {
1086 struct sockaddr_in addr, mask;
1087 struct sockaddr *saddr, *smask;
1088 struct ifnet *ifp;
1089
1090 saddr = (struct sockaddr *)&addr;
1091 bzero(&addr, sizeof(addr));
1092 addr.sin_len = sizeof(addr);
1093 addr.sin_family = AF_INET;
1094 smask = (struct sockaddr *)&mask;
1095 bzero(&mask, sizeof(mask));
1096 mask.sin_len = sizeof(mask);
1097 mask.sin_family = AF_INET;
1098 mask.sin_addr.s_addr = ia->ia_subnetmask;
1099 ifp = ia->ia_ifp;
1100
1101 if (all) {
1102 /*
1103 * Remove all L2 entries matching given prefix.
1104 * Convert address to host representation to avoid
1105 * doing this on every callback. ia_subnetmask is already
1106 * stored in host representation.
1107 */
1108 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
1109 lltable_prefix_free(AF_INET, saddr, smask, flags);
1110 } else {
1111 /* Remove interface address only */
1112 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
1113 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
1114 }
1115 }
1116
1117 /*
1118 * If there is no other address in the system that can serve a route to the
1119 * same prefix, remove the route. Hand over the route to the new address
1120 * otherwise.
1121 */
1122 int
in_scrubprefix(struct in_ifaddr * target,u_int flags)1123 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1124 {
1125 struct epoch_tracker et;
1126 struct in_ifaddr *ia;
1127 struct in_addr prefix, mask, p, m;
1128 int error = 0;
1129
1130 /*
1131 * Remove the loopback route to the interface address.
1132 */
1133 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) {
1134 struct in_ifaddr *eia;
1135
1136 eia = in_localip_more(target);
1137
1138 if (eia != NULL) {
1139 error = ifa_switch_loopback_route((struct ifaddr *)eia,
1140 (struct sockaddr *)&target->ia_addr);
1141 ifa_free(&eia->ia_ifa);
1142 } else {
1143 error = ifa_del_loopback_route((struct ifaddr *)target,
1144 (struct sockaddr *)&target->ia_addr);
1145 }
1146 }
1147
1148 ia_getrtprefix(target, &prefix, &mask);
1149
1150 if ((target->ia_flags & IFA_ROUTE) == 0) {
1151 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1152
1153 /*
1154 * Removing address from !IFF_UP interface or
1155 * prefix which exists on other interface (along with route).
1156 * No entries should exist here except target addr.
1157 * Given that, delete this entry only.
1158 */
1159 in_scrubprefixlle(target, 0, flags);
1160 return (0);
1161 }
1162
1163 NET_EPOCH_ENTER(et);
1164 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1165 ia_getrtprefix(ia, &p, &m);
1166
1167 if (prefix.s_addr != p.s_addr ||
1168 mask.s_addr != m.s_addr)
1169 continue;
1170
1171 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1172 continue;
1173
1174 /*
1175 * If we got a matching prefix address, move IFA_ROUTE and
1176 * the route itself to it. Make sure that routing daemons
1177 * get a heads-up.
1178 */
1179 if ((ia->ia_flags & IFA_ROUTE) == 0) {
1180 ifa_ref(&ia->ia_ifa);
1181 NET_EPOCH_EXIT(et);
1182 error = in_handle_ifaddr_route(RTM_DELETE, target);
1183 if (error == 0)
1184 target->ia_flags &= ~IFA_ROUTE;
1185 else
1186 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1187 error);
1188 /* Scrub all entries IFF interface is different */
1189 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
1190 flags);
1191 error = in_handle_ifaddr_route(RTM_ADD, ia);
1192 if (error == 0)
1193 ia->ia_flags |= IFA_ROUTE;
1194 else
1195 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1196 error);
1197 ifa_free(&ia->ia_ifa);
1198 return (error);
1199 }
1200 }
1201 NET_EPOCH_EXIT(et);
1202
1203 /*
1204 * remove all L2 entries on the given prefix
1205 */
1206 in_scrubprefixlle(target, 1, flags);
1207
1208 /*
1209 * As no-one seem to have this prefix, we can remove the route.
1210 */
1211 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1212 error = in_handle_ifaddr_route(RTM_DELETE, target);
1213 if (error == 0)
1214 target->ia_flags &= ~IFA_ROUTE;
1215 else
1216 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1217 return (error);
1218 }
1219
1220 void
in_ifscrub_all(void)1221 in_ifscrub_all(void)
1222 {
1223 struct ifnet *ifp;
1224 struct ifaddr *ifa, *nifa;
1225 struct ifreq ifr;
1226
1227 IFNET_RLOCK();
1228 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1229 /* Cannot lock here - lock recursion. */
1230 /* NET_EPOCH_ENTER(et); */
1231 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1232 if (ifa->ifa_addr->sa_family != AF_INET)
1233 continue;
1234
1235 /*
1236 * This is ugly but the only way for legacy IP to
1237 * cleanly remove addresses and everything attached.
1238 */
1239 bzero(&ifr, sizeof(ifr));
1240 ifr.ifr_addr = *ifa->ifa_addr;
1241 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
1242 ifp, NULL);
1243 }
1244 /* NET_EPOCH_EXIT(et); */
1245 in_purgemaddrs(ifp);
1246 igmp_domifdetach(ifp);
1247 }
1248 IFNET_RUNLOCK();
1249 }
1250
1251 int
in_ifaddr_broadcast(struct in_addr in,struct in_ifaddr * ia)1252 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
1253 {
1254
1255 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1256 /*
1257 * Optionally check for old-style (host 0) broadcast, but
1258 * taking into account that RFC 3021 obsoletes it.
1259 */
1260 (V_broadcast_lowest && ia->ia_subnetmask != IN_RFC3021_MASK &&
1261 ntohl(in.s_addr) == ia->ia_subnet)) &&
1262 /*
1263 * Check for an all one subnetmask. These
1264 * only exist when an interface gets a secondary
1265 * address.
1266 */
1267 ia->ia_subnetmask != (u_long)0xffffffff);
1268 }
1269
1270 /*
1271 * Return 1 if the address might be a local broadcast address.
1272 */
1273 int
in_broadcast(struct in_addr in,struct ifnet * ifp)1274 in_broadcast(struct in_addr in, struct ifnet *ifp)
1275 {
1276 struct ifaddr *ifa;
1277 int found;
1278
1279 NET_EPOCH_ASSERT();
1280
1281 if (in.s_addr == INADDR_BROADCAST ||
1282 in.s_addr == INADDR_ANY)
1283 return (1);
1284 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1285 return (0);
1286 found = 0;
1287 /*
1288 * Look through the list of addresses for a match
1289 * with a broadcast address.
1290 */
1291 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1292 if (ifa->ifa_addr->sa_family == AF_INET &&
1293 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
1294 found = 1;
1295 break;
1296 }
1297 return (found);
1298 }
1299
1300 /*
1301 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1302 */
1303 void
in_ifdetach(struct ifnet * ifp)1304 in_ifdetach(struct ifnet *ifp)
1305 {
1306 IN_MULTI_LOCK();
1307 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1308 in_pcbpurgeif0(&V_udbinfo, ifp);
1309 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1310 in_purgemaddrs(ifp);
1311 IN_MULTI_UNLOCK();
1312
1313 /*
1314 * Make sure all multicast deletions invoking if_ioctl() are
1315 * completed before returning. Else we risk accessing a freed
1316 * ifnet structure pointer.
1317 */
1318 inm_release_wait(NULL);
1319 }
1320
1321 static void
in_ifnet_event(void * arg __unused,struct ifnet * ifp,int event)1322 in_ifnet_event(void *arg __unused, struct ifnet *ifp, int event)
1323 {
1324 struct epoch_tracker et;
1325 struct ifaddr *ifa;
1326 struct in_ifaddr *ia;
1327 int error;
1328
1329 NET_EPOCH_ENTER(et);
1330 switch (event) {
1331 case IFNET_EVENT_DOWN:
1332 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1333 if (ifa->ifa_addr->sa_family != AF_INET)
1334 continue;
1335 ia = (struct in_ifaddr *)ifa;
1336 if ((ia->ia_flags & IFA_ROUTE) == 0)
1337 continue;
1338 ifa_ref(ifa);
1339 /*
1340 * in_scrubprefix() kills the interface route.
1341 */
1342 in_scrubprefix(ia, 0);
1343 /*
1344 * in_ifadown gets rid of all the rest of the
1345 * routes. This is not quite the right thing
1346 * to do, but at least if we are running a
1347 * routing process they will come back.
1348 */
1349 in_ifadown(ifa, 0);
1350 ifa_free(ifa);
1351 }
1352 break;
1353
1354 case IFNET_EVENT_UP:
1355 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1356 if (ifa->ifa_addr->sa_family != AF_INET)
1357 continue;
1358 ia = (struct in_ifaddr *)ifa;
1359 if (ia->ia_flags & IFA_ROUTE)
1360 continue;
1361 ifa_ref(ifa);
1362 error = ifa_del_loopback_route(ifa, ifa->ifa_addr);
1363 rt_addrmsg(RTM_ADD, ifa, ifa->ifa_ifp->if_fib);
1364 error = in_handle_ifaddr_route(RTM_ADD, ia);
1365 if (error == 0)
1366 ia->ia_flags |= IFA_ROUTE;
1367 error = ifa_add_loopback_route(ifa, ifa->ifa_addr);
1368 ifa_free(ifa);
1369 }
1370 break;
1371 }
1372 NET_EPOCH_EXIT(et);
1373 }
1374 EVENTHANDLER_DEFINE(ifnet_event, in_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
1375
1376 /*
1377 * Delete all IPv4 multicast address records, and associated link-layer
1378 * multicast address records, associated with ifp.
1379 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1380 * XXX This should not race with ifma_protospec being set during
1381 * a new allocation, if it does, we have bigger problems.
1382 */
1383 static void
in_purgemaddrs(struct ifnet * ifp)1384 in_purgemaddrs(struct ifnet *ifp)
1385 {
1386 struct epoch_tracker et;
1387 struct in_multi_head purgeinms;
1388 struct in_multi *inm;
1389 struct ifmultiaddr *ifma;
1390
1391 SLIST_INIT(&purgeinms);
1392 IN_MULTI_LIST_LOCK();
1393
1394 /*
1395 * Extract list of in_multi associated with the detaching ifp
1396 * which the PF_INET layer is about to release.
1397 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1398 * by code further down.
1399 */
1400 IF_ADDR_WLOCK(ifp);
1401 NET_EPOCH_ENTER(et);
1402 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1403 inm = inm_ifmultiaddr_get_inm(ifma);
1404 if (inm == NULL)
1405 continue;
1406 inm_rele_locked(&purgeinms, inm);
1407 }
1408 NET_EPOCH_EXIT(et);
1409 IF_ADDR_WUNLOCK(ifp);
1410
1411 inm_release_list_deferred(&purgeinms);
1412 igmp_ifdetach(ifp);
1413 IN_MULTI_LIST_UNLOCK();
1414 }
1415
1416 struct in_llentry {
1417 struct llentry base;
1418 };
1419
1420 #define IN_LLTBL_DEFAULT_HSIZE 32
1421 #define IN_LLTBL_HASH(k, h) \
1422 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1423
1424 /*
1425 * Do actual deallocation of @lle.
1426 */
1427 static void
in_lltable_destroy_lle_unlocked(epoch_context_t ctx)1428 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1429 {
1430 struct llentry *lle;
1431
1432 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1433 LLE_LOCK_DESTROY(lle);
1434 LLE_REQ_DESTROY(lle);
1435 free(lle, M_LLTABLE);
1436 }
1437
1438 /*
1439 * Called by LLE_FREE_LOCKED when number of references
1440 * drops to zero.
1441 */
1442 static void
in_lltable_destroy_lle(struct llentry * lle)1443 in_lltable_destroy_lle(struct llentry *lle)
1444 {
1445
1446 LLE_WUNLOCK(lle);
1447 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1448 }
1449
1450 static struct llentry *
in_lltable_new(struct in_addr addr4,u_int flags)1451 in_lltable_new(struct in_addr addr4, u_int flags)
1452 {
1453 struct in_llentry *lle;
1454
1455 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1456 if (lle == NULL) /* NB: caller generates msg */
1457 return NULL;
1458
1459 /*
1460 * For IPv4 this will trigger "arpresolve" to generate
1461 * an ARP request.
1462 */
1463 lle->base.la_expire = time_uptime; /* mark expired */
1464 lle->base.r_l3addr.addr4 = addr4;
1465 lle->base.lle_refcnt = 1;
1466 lle->base.lle_free = in_lltable_destroy_lle;
1467 LLE_LOCK_INIT(&lle->base);
1468 LLE_REQ_INIT(&lle->base);
1469 callout_init(&lle->base.lle_timer, 1);
1470
1471 return (&lle->base);
1472 }
1473
1474 static int
in_lltable_match_prefix(const struct sockaddr * saddr,const struct sockaddr * smask,u_int flags,struct llentry * lle)1475 in_lltable_match_prefix(const struct sockaddr *saddr,
1476 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1477 {
1478 struct in_addr addr, mask, lle_addr;
1479
1480 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1481 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1482 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1483
1484 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1485 return (0);
1486
1487 if (lle->la_flags & LLE_IFADDR) {
1488 /*
1489 * Delete LLE_IFADDR records IFF address & flag matches.
1490 * Note that addr is the interface address within prefix
1491 * being matched.
1492 * Note also we should handle 'ifdown' cases without removing
1493 * ifaddr macs.
1494 */
1495 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1496 return (1);
1497 return (0);
1498 }
1499
1500 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1501 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1502 return (1);
1503
1504 return (0);
1505 }
1506
1507 static void
in_lltable_free_entry(struct lltable * llt,struct llentry * lle)1508 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1509 {
1510 size_t pkts_dropped;
1511
1512 LLE_WLOCK_ASSERT(lle);
1513 KASSERT(llt != NULL, ("lltable is NULL"));
1514
1515 /* Unlink entry from table if not already */
1516 if ((lle->la_flags & LLE_LINKED) != 0) {
1517 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1518 lltable_unlink_entry(llt, lle);
1519 }
1520
1521 /* Drop hold queue */
1522 pkts_dropped = llentry_free(lle);
1523 ARPSTAT_ADD(dropped, pkts_dropped);
1524 }
1525
1526 static int
in_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)1527 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1528 {
1529 struct nhop_object *nh;
1530 struct in_addr addr;
1531
1532 KASSERT(l3addr->sa_family == AF_INET,
1533 ("sin_family %d", l3addr->sa_family));
1534
1535 addr = ((const struct sockaddr_in *)l3addr)->sin_addr;
1536
1537 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0);
1538 if (nh == NULL)
1539 return (EINVAL);
1540
1541 /*
1542 * If the gateway for an existing host route matches the target L3
1543 * address, which is a special route inserted by some implementation
1544 * such as MANET, and the interface is of the correct type, then
1545 * allow for ARP to proceed.
1546 */
1547 if (nh->nh_flags & NHF_GATEWAY) {
1548 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER ||
1549 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1550 memcmp(nh->gw_sa.sa_data, l3addr->sa_data,
1551 sizeof(in_addr_t)) != 0) {
1552 return (EINVAL);
1553 }
1554 }
1555
1556 /*
1557 * Make sure that at least the destination address is covered
1558 * by the route. This is for handling the case where 2 or more
1559 * interfaces have the same prefix. An incoming packet arrives
1560 * on one interface and the corresponding outgoing packet leaves
1561 * another interface.
1562 */
1563 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) {
1564 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp);
1565 struct in_addr dst_addr, mask_addr;
1566
1567 if (ia == NULL)
1568 return (EINVAL);
1569
1570 /*
1571 * ifaof_ifpforaddr() returns _best matching_ IFA.
1572 * It is possible that ifa prefix does not cover our address.
1573 * Explicitly verify and fail if that's the case.
1574 */
1575 dst_addr = IA_SIN(ia)->sin_addr;
1576 mask_addr.s_addr = htonl(ia->ia_subnetmask);
1577
1578 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr))
1579 return (EINVAL);
1580 }
1581
1582 return (0);
1583 }
1584
1585 static inline uint32_t
in_lltable_hash_dst(const struct in_addr dst,uint32_t hsize)1586 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1587 {
1588
1589 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1590 }
1591
1592 static uint32_t
in_lltable_hash(const struct llentry * lle,uint32_t hsize)1593 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1594 {
1595
1596 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1597 }
1598
1599 static void
in_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)1600 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1601 {
1602 struct sockaddr_in *sin;
1603
1604 sin = (struct sockaddr_in *)sa;
1605 bzero(sin, sizeof(*sin));
1606 sin->sin_family = AF_INET;
1607 sin->sin_len = sizeof(*sin);
1608 sin->sin_addr = lle->r_l3addr.addr4;
1609 }
1610
1611 static inline struct llentry *
in_lltable_find_dst(struct lltable * llt,struct in_addr dst)1612 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1613 {
1614 struct llentry *lle;
1615 struct llentries *lleh;
1616 u_int hashidx;
1617
1618 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1619 lleh = &llt->lle_head[hashidx];
1620 CK_LIST_FOREACH(lle, lleh, lle_next) {
1621 if (lle->la_flags & LLE_DELETED)
1622 continue;
1623 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1624 break;
1625 }
1626
1627 return (lle);
1628 }
1629
1630 static void
in_lltable_delete_entry(struct lltable * llt,struct llentry * lle)1631 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1632 {
1633
1634 lle->la_flags |= LLE_DELETED;
1635 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1636 #ifdef DIAGNOSTIC
1637 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1638 #endif
1639 llentry_free(lle);
1640 }
1641
1642 static struct llentry *
in_lltable_alloc(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1643 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1644 {
1645 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1646 struct ifnet *ifp = llt->llt_ifp;
1647 struct llentry *lle;
1648 char linkhdr[LLE_MAX_LINKHDR];
1649 size_t linkhdrsize;
1650 int lladdr_off;
1651
1652 KASSERT(l3addr->sa_family == AF_INET,
1653 ("sin_family %d", l3addr->sa_family));
1654
1655 /*
1656 * A route that covers the given address must have
1657 * been installed 1st because we are doing a resolution,
1658 * verify this.
1659 */
1660 if (!(flags & LLE_IFADDR) &&
1661 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1662 return (NULL);
1663
1664 lle = in_lltable_new(sin->sin_addr, flags);
1665 if (lle == NULL) {
1666 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1667 return (NULL);
1668 }
1669 lle->la_flags = flags;
1670 if (flags & LLE_STATIC)
1671 lle->r_flags |= RLLE_VALID;
1672 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1673 linkhdrsize = LLE_MAX_LINKHDR;
1674 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1675 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1676 in_lltable_free_entry(llt, lle);
1677 return (NULL);
1678 }
1679 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1680 lladdr_off);
1681 lle->la_flags |= LLE_STATIC;
1682 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1683 lle->la_expire = 0;
1684 }
1685
1686 return (lle);
1687 }
1688
1689 /*
1690 * Return NULL if not found or marked for deletion.
1691 * If found return lle read locked.
1692 */
1693 static struct llentry *
in_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1694 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1695 {
1696 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1697 struct llentry *lle;
1698
1699 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1700 KASSERT(l3addr->sa_family == AF_INET,
1701 ("sin_family %d", l3addr->sa_family));
1702 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1703 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1704 ("wrong lle request flags: %#x", flags));
1705
1706 lle = in_lltable_find_dst(llt, sin->sin_addr);
1707 if (lle == NULL)
1708 return (NULL);
1709 if (flags & LLE_UNLOCKED)
1710 return (lle);
1711
1712 if (flags & LLE_EXCLUSIVE)
1713 LLE_WLOCK(lle);
1714 else
1715 LLE_RLOCK(lle);
1716
1717 /*
1718 * If the afdata lock is not held, the LLE may have been unlinked while
1719 * we were blocked on the LLE lock. Check for this case.
1720 */
1721 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1722 if (flags & LLE_EXCLUSIVE)
1723 LLE_WUNLOCK(lle);
1724 else
1725 LLE_RUNLOCK(lle);
1726 return (NULL);
1727 }
1728 return (lle);
1729 }
1730
1731 static int
in_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct sysctl_req * wr)1732 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1733 struct sysctl_req *wr)
1734 {
1735 struct ifnet *ifp = llt->llt_ifp;
1736 /* XXX stack use */
1737 struct {
1738 struct rt_msghdr rtm;
1739 struct sockaddr_in sin;
1740 struct sockaddr_dl sdl;
1741 } arpc;
1742 struct sockaddr_dl *sdl;
1743 int error;
1744
1745 bzero(&arpc, sizeof(arpc));
1746 /* skip deleted entries */
1747 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1748 return (0);
1749 /* Skip if jailed and not a valid IP of the prison. */
1750 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1751 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1752 return (0);
1753 /*
1754 * produce a msg made of:
1755 * struct rt_msghdr;
1756 * struct sockaddr_in; (IPv4)
1757 * struct sockaddr_dl;
1758 */
1759 arpc.rtm.rtm_msglen = sizeof(arpc);
1760 arpc.rtm.rtm_version = RTM_VERSION;
1761 arpc.rtm.rtm_type = RTM_GET;
1762 arpc.rtm.rtm_flags = RTF_UP;
1763 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1764
1765 /* publish */
1766 if (lle->la_flags & LLE_PUB)
1767 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1768
1769 sdl = &arpc.sdl;
1770 sdl->sdl_family = AF_LINK;
1771 sdl->sdl_len = sizeof(*sdl);
1772 sdl->sdl_index = ifp->if_index;
1773 sdl->sdl_type = ifp->if_type;
1774 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1775 sdl->sdl_alen = ifp->if_addrlen;
1776 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1777 } else {
1778 sdl->sdl_alen = 0;
1779 bzero(LLADDR(sdl), ifp->if_addrlen);
1780 }
1781
1782 arpc.rtm.rtm_rmx.rmx_expire =
1783 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1784 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1785 if (lle->la_flags & LLE_STATIC)
1786 arpc.rtm.rtm_flags |= RTF_STATIC;
1787 if (lle->la_flags & LLE_IFADDR)
1788 arpc.rtm.rtm_flags |= RTF_PINNED;
1789 arpc.rtm.rtm_index = ifp->if_index;
1790 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1791
1792 return (error);
1793 }
1794
1795 static void
in_lltable_post_resolved(struct lltable * llt,struct llentry * lle)1796 in_lltable_post_resolved(struct lltable *llt, struct llentry *lle)
1797 {
1798 struct ifnet *ifp = llt->llt_ifp;
1799
1800 /* gratuitous ARP */
1801 if ((lle->la_flags & LLE_PUB) != 0)
1802 arprequest(ifp, &lle->r_l3addr.addr4, &lle->r_l3addr.addr4,
1803 lle->ll_addr);
1804 }
1805
1806 static struct lltable *
in_lltattach(struct ifnet * ifp)1807 in_lltattach(struct ifnet *ifp)
1808 {
1809 struct lltable *llt;
1810
1811 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1812 llt->llt_af = AF_INET;
1813 llt->llt_ifp = ifp;
1814
1815 llt->llt_lookup = in_lltable_lookup;
1816 llt->llt_alloc_entry = in_lltable_alloc;
1817 llt->llt_delete_entry = in_lltable_delete_entry;
1818 llt->llt_dump_entry = in_lltable_dump_entry;
1819 llt->llt_hash = in_lltable_hash;
1820 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1821 llt->llt_free_entry = in_lltable_free_entry;
1822 llt->llt_match_prefix = in_lltable_match_prefix;
1823 llt->llt_mark_used = llentry_mark_used;
1824 llt->llt_post_resolved = in_lltable_post_resolved;
1825 lltable_link(llt);
1826
1827 return (llt);
1828 }
1829
1830 struct lltable *
in_lltable_get(struct ifnet * ifp)1831 in_lltable_get(struct ifnet *ifp)
1832 {
1833 struct lltable *llt = NULL;
1834
1835 void *afdata_ptr = ifp->if_afdata[AF_INET];
1836 if (afdata_ptr != NULL)
1837 llt = ((struct in_ifinfo *)afdata_ptr)->ii_llt;
1838 return (llt);
1839 }
1840
1841 void *
in_domifattach(struct ifnet * ifp)1842 in_domifattach(struct ifnet *ifp)
1843 {
1844 struct in_ifinfo *ii;
1845
1846 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1847
1848 ii->ii_llt = in_lltattach(ifp);
1849 ii->ii_igmp = igmp_domifattach(ifp);
1850
1851 return (ii);
1852 }
1853
1854 void
in_domifdetach(struct ifnet * ifp,void * aux)1855 in_domifdetach(struct ifnet *ifp, void *aux)
1856 {
1857 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1858
1859 igmp_domifdetach(ifp);
1860 lltable_free(ii->ii_llt);
1861 free(ii, M_IFADDR);
1862 }
1863