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 * @(#)in.c 8.4 (Berkeley) 1/9/95
33 */
34
35 #include <sys/cdefs.h>
36 #include "opt_inet.h"
37
38 #define IN_HISTORICAL_NETS /* include class masks */
39
40 #include <sys/param.h>
41 #include <sys/eventhandler.h>
42 #include <sys/systm.h>
43 #include <sys/sockio.h>
44 #include <sys/malloc.h>
45 #include <sys/priv.h>
46 #include <sys/socket.h>
47 #include <sys/jail.h>
48 #include <sys/kernel.h>
49 #include <sys/lock.h>
50 #include <sys/proc.h>
51 #include <sys/sysctl.h>
52 #include <sys/syslog.h>
53 #include <sys/sx.h>
54
55 #include <net/if.h>
56 #include <net/if_var.h>
57 #include <net/if_arp.h>
58 #include <net/if_dl.h>
59 #include <net/if_llatbl.h>
60 #include <net/if_private.h>
61 #include <net/if_types.h>
62 #include <net/route.h>
63 #include <net/route/nhop.h>
64 #include <net/route/route_ctl.h>
65 #include <net/vnet.h>
66
67 #include <netinet/if_ether.h>
68 #include <netinet/in.h>
69 #include <netinet/in_fib.h>
70 #include <netinet/in_var.h>
71 #include <netinet/in_pcb.h>
72 #include <netinet/ip_var.h>
73 #include <netinet/ip_carp.h>
74 #include <netinet/igmp_var.h>
75 #include <netinet/udp.h>
76 #include <netinet/udp_var.h>
77
78 #ifdef MAC
79 #include <security/mac/mac_framework.h>
80 #endif
81
82 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
83 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
84 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
85
86 static void in_socktrim(struct sockaddr_in *);
87 static void in_purgemaddrs(struct ifnet *);
88
89 static bool ia_need_loopback_route(const struct in_ifaddr *);
90
91 VNET_DEFINE_STATIC(int, nosameprefix);
92 #define V_nosameprefix VNET(nosameprefix)
93 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
94 &VNET_NAME(nosameprefix), 0,
95 "Refuse to create same prefixes on different interfaces");
96
97 VNET_DEFINE_STATIC(bool, broadcast_lowest);
98 #define V_broadcast_lowest VNET(broadcast_lowest)
99 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, broadcast_lowest, CTLFLAG_VNET | CTLFLAG_RW,
100 &VNET_NAME(broadcast_lowest), 0,
101 "Treat lowest address on a subnet (host 0) as broadcast");
102
103 VNET_DEFINE(bool, ip_allow_net240) = false;
104 #define V_ip_allow_net240 VNET(ip_allow_net240)
105 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net240,
106 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net240), 0,
107 "Allow use of Experimental addresses, aka Class E (240/4)");
108 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-240 */
109
110 VNET_DEFINE(bool, ip_allow_net0) = false;
111 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net0,
112 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net0), 0,
113 "Allow use of addresses in network 0/8");
114 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-0 */
115
116 VNET_DEFINE(uint32_t, in_loopback_mask) = IN_LOOPBACK_MASK_DFLT;
117 #define V_in_loopback_mask VNET(in_loopback_mask)
118 static int sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS);
119 SYSCTL_PROC(_net_inet_ip, OID_AUTO, loopback_prefixlen,
120 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
121 NULL, 0, sysctl_loopback_prefixlen, "I",
122 "Prefix length of address space reserved for loopback");
123 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-127 */
124
125 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
126 #define V_ripcbinfo VNET(ripcbinfo)
127
128 static struct sx in_control_sx;
129 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
130
131 /*
132 * Return 1 if an internet address is for a ``local'' host
133 * (one to which we have a connection).
134 */
135 int
in_localaddr(struct in_addr in)136 in_localaddr(struct in_addr in)
137 {
138 u_long i = ntohl(in.s_addr);
139 struct in_ifaddr *ia;
140
141 NET_EPOCH_ASSERT();
142
143 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
144 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
145 return (1);
146 }
147
148 return (0);
149 }
150
151 /*
152 * Return 1 if an internet address is for the local host and configured
153 * on one of its interfaces.
154 */
155 bool
in_localip(struct in_addr in)156 in_localip(struct in_addr in)
157 {
158 struct in_ifaddr *ia;
159
160 NET_EPOCH_ASSERT();
161
162 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
163 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr)
164 return (true);
165
166 return (false);
167 }
168
169 /*
170 * Like in_localip(), but FIB-aware and carp(4)-aware.
171 */
172 bool
in_localip_fib(struct in_addr in,uint16_t fib)173 in_localip_fib(struct in_addr in, uint16_t fib)
174 {
175 struct in_ifaddr *ia;
176
177 NET_EPOCH_ASSERT();
178
179 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
180 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr &&
181 (ia->ia_ifa.ifa_carp == NULL ||
182 carp_master_p(&ia->ia_ifa)) &&
183 ia->ia_ifa.ifa_ifp->if_fib == fib)
184 return (true);
185
186 return (false);
187 }
188
189 /*
190 * Return 1 if an internet address is configured on an interface.
191 */
192 int
in_ifhasaddr(struct ifnet * ifp,struct in_addr in)193 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
194 {
195 struct ifaddr *ifa;
196 struct in_ifaddr *ia;
197
198 NET_EPOCH_ASSERT();
199
200 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
201 if (ifa->ifa_addr->sa_family != AF_INET)
202 continue;
203 ia = (struct in_ifaddr *)ifa;
204 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
205 return (1);
206 }
207
208 return (0);
209 }
210
211 /*
212 * Return a reference to the interface address which is different to
213 * the supplied one but with same IP address value.
214 */
215 static struct in_ifaddr *
in_localip_more(struct in_ifaddr * original_ia)216 in_localip_more(struct in_ifaddr *original_ia)
217 {
218 struct epoch_tracker et;
219 in_addr_t original_addr = IA_SIN(original_ia)->sin_addr.s_addr;
220 uint32_t original_fib = original_ia->ia_ifa.ifa_ifp->if_fib;
221 struct in_ifaddr *ia;
222
223 NET_EPOCH_ENTER(et);
224 CK_LIST_FOREACH(ia, INADDR_HASH(original_addr), ia_hash) {
225 in_addr_t addr = IA_SIN(ia)->sin_addr.s_addr;
226 uint32_t fib = ia->ia_ifa.ifa_ifp->if_fib;
227 if (!V_rt_add_addr_allfibs && (original_fib != fib))
228 continue;
229 if ((original_ia != ia) && (original_addr == addr)) {
230 ifa_ref(&ia->ia_ifa);
231 NET_EPOCH_EXIT(et);
232 return (ia);
233 }
234 }
235 NET_EPOCH_EXIT(et);
236
237 return (NULL);
238 }
239
240 /*
241 * Tries to find first IPv4 address in the provided fib.
242 * Prefers non-loopback addresses and return loopback IFF
243 * @loopback_ok is set.
244 *
245 * Returns ifa or NULL.
246 */
247 struct in_ifaddr *
in_findlocal(uint32_t fibnum,bool loopback_ok)248 in_findlocal(uint32_t fibnum, bool loopback_ok)
249 {
250 struct in_ifaddr *ia = NULL, *ia_lo = NULL;
251
252 NET_EPOCH_ASSERT();
253
254 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
255 uint32_t ia_fib = ia->ia_ifa.ifa_ifp->if_fib;
256 if (!V_rt_add_addr_allfibs && (fibnum != ia_fib))
257 continue;
258
259 if (!IN_LOOPBACK(ntohl(IA_SIN(ia)->sin_addr.s_addr)))
260 break;
261 if (loopback_ok)
262 ia_lo = ia;
263 }
264
265 if (ia == NULL)
266 ia = ia_lo;
267
268 return (ia);
269 }
270
271 /*
272 * Determine whether an IP address is in a reserved set of addresses
273 * that may not be forwarded, or whether datagrams to that destination
274 * may be forwarded.
275 */
276 int
in_canforward(struct in_addr in)277 in_canforward(struct in_addr in)
278 {
279 u_long i = ntohl(in.s_addr);
280
281 if (IN_MULTICAST(i) || IN_LINKLOCAL(i) || IN_LOOPBACK(i))
282 return (0);
283 if (IN_EXPERIMENTAL(i) && !V_ip_allow_net240)
284 return (0);
285 if (IN_ZERONET(i) && !V_ip_allow_net0)
286 return (0);
287 return (1);
288 }
289
290 /*
291 * Sysctl to manage prefix of reserved loopback network; translate
292 * to/from mask. The mask is always contiguous high-order 1 bits
293 * followed by all 0 bits.
294 */
295 static int
sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)296 sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)
297 {
298 int error, preflen;
299
300 /* ffs is 1-based; compensate. */
301 preflen = 33 - ffs(V_in_loopback_mask);
302 error = sysctl_handle_int(oidp, &preflen, 0, req);
303 if (error || !req->newptr)
304 return (error);
305 if (preflen < 8 || preflen > 31)
306 return (EINVAL);
307 V_in_loopback_mask = 0xffffffff << (32 - preflen);
308 return (0);
309 }
310
311 /*
312 * Trim a mask in a sockaddr
313 */
314 static void
in_socktrim(struct sockaddr_in * ap)315 in_socktrim(struct sockaddr_in *ap)
316 {
317 char *cplim = (char *) &ap->sin_addr;
318 char *cp = (char *) (&ap->sin_addr + 1);
319
320 ap->sin_len = 0;
321 while (--cp >= cplim)
322 if (*cp) {
323 (ap)->sin_len = cp - (char *) (ap) + 1;
324 break;
325 }
326 }
327
328 /*
329 * Generic internet control operations (ioctl's).
330 */
331 int
in_control_ioctl(u_long cmd,void * data,struct ifnet * ifp,struct ucred * cred)332 in_control_ioctl(u_long cmd, void *data, struct ifnet *ifp,
333 struct ucred *cred)
334 {
335 struct ifreq *ifr = (struct ifreq *)data;
336 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
337 struct epoch_tracker et;
338 struct ifaddr *ifa;
339 struct in_ifaddr *ia;
340 int error;
341
342 if (ifp == NULL)
343 return (EADDRNOTAVAIL);
344
345 /*
346 * Filter out 4 ioctls we implement directly. Forward the rest
347 * to specific functions and ifp->if_ioctl().
348 */
349 switch (cmd) {
350 case SIOCGIFADDR:
351 case SIOCGIFBRDADDR:
352 case SIOCGIFDSTADDR:
353 case SIOCGIFNETMASK:
354 break;
355 case SIOCGIFALIAS:
356 sx_xlock(&in_control_sx);
357 error = in_gifaddr_ioctl(cmd, data, ifp, cred);
358 sx_xunlock(&in_control_sx);
359 return (error);
360 case SIOCDIFADDR:
361 sx_xlock(&in_control_sx);
362 error = in_difaddr_ioctl(cmd, data, ifp, cred);
363 sx_xunlock(&in_control_sx);
364 return (error);
365 case OSIOCAIFADDR: /* 9.x compat */
366 case SIOCAIFADDR:
367 sx_xlock(&in_control_sx);
368 error = in_aifaddr_ioctl(cmd, data, ifp, cred);
369 sx_xunlock(&in_control_sx);
370 return (error);
371 case SIOCSIFADDR:
372 case SIOCSIFBRDADDR:
373 case SIOCSIFDSTADDR:
374 case SIOCSIFNETMASK:
375 /* We no longer support that old commands. */
376 return (EINVAL);
377 default:
378 if (ifp->if_ioctl == NULL)
379 return (EOPNOTSUPP);
380 return ((*ifp->if_ioctl)(ifp, cmd, data));
381 }
382
383 if (addr->sin_addr.s_addr != INADDR_ANY &&
384 prison_check_ip4(cred, &addr->sin_addr) != 0)
385 return (EADDRNOTAVAIL);
386
387 /*
388 * Find address for this interface, if it exists. If an
389 * address was specified, find that one instead of the
390 * first one on the interface, if possible.
391 */
392 NET_EPOCH_ENTER(et);
393 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
394 if (ifa->ifa_addr->sa_family != AF_INET)
395 continue;
396 ia = (struct in_ifaddr *)ifa;
397 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
398 break;
399 }
400 if (ifa == NULL)
401 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
402 if (ifa->ifa_addr->sa_family == AF_INET) {
403 ia = (struct in_ifaddr *)ifa;
404 if (prison_check_ip4(cred,
405 &ia->ia_addr.sin_addr) == 0)
406 break;
407 }
408
409 if (ifa == NULL) {
410 NET_EPOCH_EXIT(et);
411 return (EADDRNOTAVAIL);
412 }
413
414 error = 0;
415 switch (cmd) {
416 case SIOCGIFADDR:
417 *addr = ia->ia_addr;
418 break;
419
420 case SIOCGIFBRDADDR:
421 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
422 error = EINVAL;
423 break;
424 }
425 *addr = ia->ia_broadaddr;
426 break;
427
428 case SIOCGIFDSTADDR:
429 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
430 error = EINVAL;
431 break;
432 }
433 *addr = ia->ia_dstaddr;
434 break;
435
436 case SIOCGIFNETMASK:
437 *addr = ia->ia_sockmask;
438 break;
439 }
440
441 NET_EPOCH_EXIT(et);
442
443 return (error);
444 }
445
446 int
in_control(struct socket * so,u_long cmd,void * data,struct ifnet * ifp,struct thread * td)447 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp,
448 struct thread *td)
449 {
450 return (in_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
451 }
452
453 static int
in_aifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)454 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
455 {
456 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
457 const struct sockaddr_in *addr = &ifra->ifra_addr;
458 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
459 const struct sockaddr_in *mask = &ifra->ifra_mask;
460 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
461 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
462 struct epoch_tracker et;
463 struct ifaddr *ifa;
464 struct in_ifaddr *ia;
465 bool iaIsFirst;
466 int error = 0;
467
468 error = priv_check_cred(cred, PRIV_NET_ADDIFADDR);
469 if (error)
470 return (error);
471
472 /*
473 * ifra_addr must be present and be of INET family.
474 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
475 */
476 if (addr->sin_len != sizeof(struct sockaddr_in) ||
477 addr->sin_family != AF_INET)
478 return (EINVAL);
479 if (broadaddr->sin_len != 0 &&
480 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
481 broadaddr->sin_family != AF_INET))
482 return (EINVAL);
483 if (mask->sin_len != 0 &&
484 (mask->sin_len != sizeof(struct sockaddr_in) ||
485 mask->sin_family != AF_INET))
486 return (EINVAL);
487 if ((ifp->if_flags & IFF_POINTOPOINT) &&
488 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
489 dstaddr->sin_addr.s_addr == INADDR_ANY))
490 return (EDESTADDRREQ);
491 if (vhid != 0 && carp_attach_p == NULL)
492 return (EPROTONOSUPPORT);
493
494 #ifdef MAC
495 /* Check if a MAC policy disallows setting the IPv4 address. */
496 error = mac_inet_check_add_addr(cred, &addr->sin_addr, ifp);
497 if (error != 0)
498 return (error);
499 #endif
500
501 /*
502 * See whether address already exist.
503 */
504 iaIsFirst = true;
505 ia = NULL;
506 NET_EPOCH_ENTER(et);
507 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
508 struct in_ifaddr *it;
509
510 if (ifa->ifa_addr->sa_family != AF_INET)
511 continue;
512
513 it = (struct in_ifaddr *)ifa;
514 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
515 prison_check_ip4(cred, &addr->sin_addr) == 0)
516 ia = it;
517 else
518 iaIsFirst = false;
519 }
520 NET_EPOCH_EXIT(et);
521
522 if (ia != NULL)
523 (void )in_difaddr_ioctl(cmd, data, ifp, cred);
524
525 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
526 ia = (struct in_ifaddr *)ifa;
527 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
528 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
529 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
530 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
531 CALLOUT_RETURNUNLOCKED);
532
533 ia->ia_ifp = ifp;
534 ia->ia_addr = *addr;
535 if (mask->sin_len != 0) {
536 ia->ia_sockmask = *mask;
537 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
538 } else {
539 in_addr_t i = ntohl(addr->sin_addr.s_addr);
540
541 /*
542 * If netmask isn't supplied, use historical default.
543 * This is deprecated for interfaces other than loopback
544 * or point-to-point; warn in other cases. In the future
545 * we should return an error rather than warning.
546 */
547 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0)
548 printf("%s: set address: WARNING: network mask "
549 "should be specified; using historical default\n",
550 ifp->if_xname);
551 if (IN_CLASSA(i))
552 ia->ia_subnetmask = IN_CLASSA_NET;
553 else if (IN_CLASSB(i))
554 ia->ia_subnetmask = IN_CLASSB_NET;
555 else
556 ia->ia_subnetmask = IN_CLASSC_NET;
557 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
558 }
559 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
560 in_socktrim(&ia->ia_sockmask);
561
562 if (ifp->if_flags & IFF_BROADCAST) {
563 if (broadaddr->sin_len != 0) {
564 ia->ia_broadaddr = *broadaddr;
565 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
566 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
567 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
568 ia->ia_broadaddr.sin_family = AF_INET;
569 } else {
570 ia->ia_broadaddr.sin_addr.s_addr =
571 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
572 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
573 ia->ia_broadaddr.sin_family = AF_INET;
574 }
575 }
576
577 if (ifp->if_flags & IFF_POINTOPOINT)
578 ia->ia_dstaddr = *dstaddr;
579
580 if (vhid != 0) {
581 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
582 if (error)
583 return (error);
584 }
585
586 /* if_addrhead is already referenced by ifa_alloc() */
587 IF_ADDR_WLOCK(ifp);
588 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
589 IF_ADDR_WUNLOCK(ifp);
590
591 ifa_ref(ifa); /* in_ifaddrhead */
592 sx_assert(&in_control_sx, SA_XLOCKED);
593 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
594 CK_LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia,
595 ia_hash);
596
597 /*
598 * Give the interface a chance to initialize
599 * if this is its first address,
600 * and to validate the address if necessary.
601 */
602 if (ifp->if_ioctl != NULL) {
603 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
604 if (error)
605 goto fail1;
606 }
607
608 /*
609 * Add route for the network.
610 */
611 if (vhid == 0) {
612 error = in_addprefix(ia);
613 if (error)
614 goto fail1;
615 }
616
617 /*
618 * Add a loopback route to self.
619 */
620 if (vhid == 0 && ia_need_loopback_route(ia)) {
621 struct in_ifaddr *eia;
622
623 eia = in_localip_more(ia);
624
625 if (eia == NULL) {
626 error = ifa_add_loopback_route((struct ifaddr *)ia,
627 (struct sockaddr *)&ia->ia_addr);
628 if (error)
629 goto fail2;
630 } else
631 ifa_free(&eia->ia_ifa);
632 }
633
634 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
635 struct in_addr allhosts_addr;
636 struct in_ifinfo *ii;
637
638 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
639 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
640
641 error = in_joingroup(ifp, &allhosts_addr, NULL,
642 &ii->ii_allhosts);
643 }
644
645 /*
646 * Note: we don't need extra reference for ifa, since we called
647 * with sx lock held, and ifaddr can not be deleted in concurrent
648 * thread.
649 */
650 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
651
652 return (error);
653
654 fail2:
655 if (vhid == 0)
656 (void )in_scrubprefix(ia, LLE_STATIC);
657
658 fail1:
659 if (ia->ia_ifa.ifa_carp)
660 (*carp_detach_p)(&ia->ia_ifa, false);
661
662 IF_ADDR_WLOCK(ifp);
663 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
664 IF_ADDR_WUNLOCK(ifp);
665 ifa_free(&ia->ia_ifa); /* if_addrhead */
666
667 sx_assert(&in_control_sx, SA_XLOCKED);
668 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
669 CK_LIST_REMOVE(ia, ia_hash);
670 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
671
672 return (error);
673 }
674
675 static int
in_difaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)676 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
677 {
678 const struct ifreq *ifr = (struct ifreq *)data;
679 const struct sockaddr_in *addr = (const struct sockaddr_in *)
680 &ifr->ifr_addr;
681 struct ifaddr *ifa;
682 struct in_ifaddr *ia;
683 bool deleteAny, iaIsLast;
684 int error;
685
686 if (cred != NULL) {
687 error = priv_check_cred(cred, PRIV_NET_DELIFADDR);
688 if (error)
689 return (error);
690 }
691
692 if (addr->sin_len != sizeof(struct sockaddr_in) ||
693 addr->sin_family != AF_INET)
694 deleteAny = true;
695 else
696 deleteAny = false;
697
698 iaIsLast = true;
699 ia = NULL;
700 IF_ADDR_WLOCK(ifp);
701 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
702 struct in_ifaddr *it;
703
704 if (ifa->ifa_addr->sa_family != AF_INET)
705 continue;
706
707 it = (struct in_ifaddr *)ifa;
708 if (deleteAny && ia == NULL && (cred == NULL ||
709 prison_check_ip4(cred, &it->ia_addr.sin_addr) == 0))
710 ia = it;
711
712 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
713 (cred == NULL || prison_check_ip4(cred,
714 &addr->sin_addr) == 0))
715 ia = it;
716
717 if (it != ia)
718 iaIsLast = false;
719 }
720
721 if (ia == NULL) {
722 IF_ADDR_WUNLOCK(ifp);
723 return (EADDRNOTAVAIL);
724 }
725
726 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
727 IF_ADDR_WUNLOCK(ifp);
728 ifa_free(&ia->ia_ifa); /* if_addrhead */
729
730 sx_assert(&in_control_sx, SA_XLOCKED);
731 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
732 CK_LIST_REMOVE(ia, ia_hash);
733
734 /*
735 * in_scrubprefix() kills the interface route.
736 */
737 in_scrubprefix(ia, LLE_STATIC);
738
739 /*
740 * in_ifadown gets rid of all the rest of
741 * the routes. This is not quite the right
742 * thing to do, but at least if we are running
743 * a routing process they will come back.
744 */
745 in_ifadown(&ia->ia_ifa, 1);
746
747 if (ia->ia_ifa.ifa_carp)
748 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
749
750 /*
751 * If this is the last IPv4 address configured on this
752 * interface, leave the all-hosts group.
753 * No state-change report need be transmitted.
754 */
755 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
756 struct in_ifinfo *ii;
757
758 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
759 if (ii->ii_allhosts) {
760 (void)in_leavegroup(ii->ii_allhosts, NULL);
761 ii->ii_allhosts = NULL;
762 }
763 }
764
765 IF_ADDR_WLOCK(ifp);
766 if (callout_stop(&ia->ia_garp_timer) == 1) {
767 ifa_free(&ia->ia_ifa);
768 }
769 IF_ADDR_WUNLOCK(ifp);
770
771 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
772 IFADDR_EVENT_DEL);
773 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
774
775 return (0);
776 }
777
778 static int
in_gifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)779 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
780 {
781 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
782 const struct sockaddr_in *addr = &ifra->ifra_addr;
783 struct epoch_tracker et;
784 struct ifaddr *ifa;
785 struct in_ifaddr *ia;
786
787 /*
788 * ifra_addr must be present and be of INET family.
789 */
790 if (addr->sin_len != sizeof(struct sockaddr_in) ||
791 addr->sin_family != AF_INET)
792 return (EINVAL);
793
794 /*
795 * See whether address exist.
796 */
797 ia = NULL;
798 NET_EPOCH_ENTER(et);
799 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
800 struct in_ifaddr *it;
801
802 if (ifa->ifa_addr->sa_family != AF_INET)
803 continue;
804
805 it = (struct in_ifaddr *)ifa;
806 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
807 prison_check_ip4(cred, &addr->sin_addr) == 0) {
808 ia = it;
809 break;
810 }
811 }
812 if (ia == NULL) {
813 NET_EPOCH_EXIT(et);
814 return (EADDRNOTAVAIL);
815 }
816
817 ifra->ifra_mask = ia->ia_sockmask;
818 if ((ifp->if_flags & IFF_POINTOPOINT) &&
819 ia->ia_dstaddr.sin_family == AF_INET)
820 ifra->ifra_dstaddr = ia->ia_dstaddr;
821 else if ((ifp->if_flags & IFF_BROADCAST) &&
822 ia->ia_broadaddr.sin_family == AF_INET)
823 ifra->ifra_broadaddr = ia->ia_broadaddr;
824 else
825 memset(&ifra->ifra_broadaddr, 0,
826 sizeof(ifra->ifra_broadaddr));
827
828 NET_EPOCH_EXIT(et);
829 return (0);
830 }
831
832 static int
in_match_ifaddr(const struct rtentry * rt,const struct nhop_object * nh,void * arg)833 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
834 {
835
836 if (nh->nh_ifa == (struct ifaddr *)arg)
837 return (1);
838
839 return (0);
840 }
841
842 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)843 in_handle_prefix_route(uint32_t fibnum, int cmd,
844 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa,
845 struct ifnet *ifp)
846 {
847
848 NET_EPOCH_ASSERT();
849
850 /* Prepare gateway */
851 struct sockaddr_dl_short sdl = {
852 .sdl_family = AF_LINK,
853 .sdl_len = sizeof(struct sockaddr_dl_short),
854 .sdl_type = ifa->ifa_ifp->if_type,
855 .sdl_index = ifa->ifa_ifp->if_index,
856 };
857
858 struct rt_addrinfo info = {
859 .rti_ifa = ifa,
860 .rti_ifp = ifp,
861 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
862 .rti_info = {
863 [RTAX_DST] = (struct sockaddr *)dst,
864 [RTAX_NETMASK] = (struct sockaddr *)netmask,
865 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
866 },
867 /* Ensure we delete the prefix IFF prefix ifa matches */
868 .rti_filter = in_match_ifaddr,
869 .rti_filterdata = ifa,
870 };
871
872 return (rib_handle_ifaddr_info(fibnum, cmd, &info));
873 }
874
875 /*
876 * Routing table interaction with interface addresses.
877 *
878 * In general, two types of routes needs to be installed:
879 * a) "interface" or "prefix" route, telling user that the addresses
880 * behind the ifa prefix are reached directly.
881 * b) "loopback" route installed for the ifa address, telling user that
882 * the address belongs to local system.
883 *
884 * Handling for (a) and (b) differs in multi-fib aspects, hence they
885 * are implemented in different functions below.
886 *
887 * The cases above may intersect - /32 interface aliases results in
888 * the same prefix produced by (a) and (b). This blurs the definition
889 * of the "loopback" route and complicate interactions. The interaction
890 * table is defined below. The case numbers are used in the multiple
891 * functions below to refer to the particular test case.
892 *
893 * There can be multiple options:
894 * 1) Adding address with prefix on non-p2p/non-loopback interface.
895 * Example: 192.0.2.1/24. Action:
896 * * add "prefix" route towards 192.0.2.0/24 via @ia interface,
897 * using @ia as an address source.
898 * * add "loopback" route towards 192.0.2.1 via V_loif, saving
899 * @ia ifp in the gateway and using @ia as an address source.
900 *
901 * 2) Adding address with /32 mask to non-p2p/non-loopback interface.
902 * Example: 192.0.2.2/32. Action:
903 * * add "prefix" host route via V_loif, using @ia as an address source.
904 *
905 * 3) Adding address with or without prefix to p2p interface.
906 * Example: 10.0.0.1/24->10.0.0.2. Action:
907 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia
908 * as an address source. Note: no sense in installing full /24 as the interface
909 * is point-to-point.
910 * * add "loopback" route towards 10.0.9.1 via V_loif, saving
911 * @ia ifp in the gateway and using @ia as an address source.
912 *
913 * 4) Adding address with or without prefix to loopback interface.
914 * Example: 192.0.2.1/24. Action:
915 * * add "prefix" host route via @ia interface, using @ia as an address source.
916 * Note: Skip installing /24 prefix as it would introduce TTL loop
917 * for the traffic destined to these addresses.
918 */
919
920 /*
921 * Checks if @ia needs to install loopback route to @ia address via
922 * ifa_maintain_loopback_route().
923 *
924 * Return true on success.
925 */
926 static bool
ia_need_loopback_route(const struct in_ifaddr * ia)927 ia_need_loopback_route(const struct in_ifaddr *ia)
928 {
929 struct ifnet *ifp = ia->ia_ifp;
930
931 /* Case 4: Skip loopback interfaces */
932 if ((ifp->if_flags & IFF_LOOPBACK) ||
933 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY))
934 return (false);
935
936 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */
937 if ((ifp->if_flags & IFF_POINTOPOINT) &&
938 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
939 return (false);
940
941 /* Case 2: skip /32 prefixes */
942 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
943 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST))
944 return (false);
945
946 return (true);
947 }
948
949 /*
950 * Calculate "prefix" route corresponding to @ia.
951 */
952 static void
ia_getrtprefix(const struct in_ifaddr * ia,struct in_addr * prefix,struct in_addr * mask)953 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask)
954 {
955
956 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) {
957 /* Case 3: return host route for dstaddr */
958 *prefix = ia->ia_dstaddr.sin_addr;
959 mask->s_addr = INADDR_BROADCAST;
960 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) {
961 /* Case 4: return host route for ifaddr */
962 *prefix = ia->ia_addr.sin_addr;
963 mask->s_addr = INADDR_BROADCAST;
964 } else {
965 /* Cases 1,2: return actual ia prefix */
966 *prefix = ia->ia_addr.sin_addr;
967 *mask = ia->ia_sockmask.sin_addr;
968 prefix->s_addr &= mask->s_addr;
969 }
970 }
971
972 /*
973 * Adds or delete interface "prefix" route corresponding to @ifa.
974 * Returns 0 on success or errno.
975 */
976 static int
in_handle_ifaddr_route(int cmd,struct in_ifaddr * ia)977 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia)
978 {
979 struct ifaddr *ifa = &ia->ia_ifa;
980 struct in_addr daddr, maddr;
981 struct sockaddr_in *pmask;
982 struct epoch_tracker et;
983 int error;
984
985 ia_getrtprefix(ia, &daddr, &maddr);
986
987 struct sockaddr_in mask = {
988 .sin_family = AF_INET,
989 .sin_len = sizeof(struct sockaddr_in),
990 .sin_addr = maddr,
991 };
992
993 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL;
994
995 struct sockaddr_in dst = {
996 .sin_family = AF_INET,
997 .sin_len = sizeof(struct sockaddr_in),
998 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr,
999 };
1000
1001 struct ifnet *ifp = ia->ia_ifp;
1002
1003 if ((maddr.s_addr == INADDR_BROADCAST) &&
1004 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) {
1005 /* Case 2: host route on broadcast interface */
1006 ifp = V_loif;
1007 }
1008
1009 uint32_t fibnum = ifa->ifa_ifp->if_fib;
1010 NET_EPOCH_ENTER(et);
1011 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp);
1012 NET_EPOCH_EXIT(et);
1013
1014 return (error);
1015 }
1016
1017 /*
1018 * Check if we have a route for the given prefix already.
1019 */
1020 static bool
in_hasrtprefix(struct in_ifaddr * target)1021 in_hasrtprefix(struct in_ifaddr *target)
1022 {
1023 struct epoch_tracker et;
1024 struct in_ifaddr *ia;
1025 struct in_addr prefix, mask, p, m;
1026 bool result = false;
1027
1028 ia_getrtprefix(target, &prefix, &mask);
1029
1030 /* Look for an existing address with the same prefix, mask, and fib */
1031 NET_EPOCH_ENTER(et);
1032 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1033 ia_getrtprefix(ia, &p, &m);
1034
1035 if (prefix.s_addr != p.s_addr ||
1036 mask.s_addr != m.s_addr)
1037 continue;
1038
1039 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
1040 continue;
1041
1042 /*
1043 * If we got a matching prefix route inserted by other
1044 * interface address, we are done here.
1045 */
1046 if (ia->ia_flags & IFA_ROUTE) {
1047 result = true;
1048 break;
1049 }
1050 }
1051 NET_EPOCH_EXIT(et);
1052
1053 return (result);
1054 }
1055
1056 int
in_addprefix(struct in_ifaddr * target)1057 in_addprefix(struct in_ifaddr *target)
1058 {
1059 int error;
1060
1061 if (in_hasrtprefix(target)) {
1062 if (V_nosameprefix)
1063 return (EEXIST);
1064 else {
1065 rt_addrmsg(RTM_ADD, &target->ia_ifa,
1066 target->ia_ifp->if_fib);
1067 return (0);
1068 }
1069 }
1070
1071 /*
1072 * No-one seem to have this prefix route, so we try to insert it.
1073 */
1074 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib);
1075 error = in_handle_ifaddr_route(RTM_ADD, target);
1076 if (!error)
1077 target->ia_flags |= IFA_ROUTE;
1078 return (error);
1079 }
1080
1081 /*
1082 * Removes either all lle entries for given @ia, or lle
1083 * corresponding to @ia address.
1084 */
1085 static void
in_scrubprefixlle(struct in_ifaddr * ia,int all,u_int flags)1086 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
1087 {
1088 struct sockaddr_in addr, mask;
1089 struct sockaddr *saddr, *smask;
1090 struct ifnet *ifp;
1091
1092 saddr = (struct sockaddr *)&addr;
1093 bzero(&addr, sizeof(addr));
1094 addr.sin_len = sizeof(addr);
1095 addr.sin_family = AF_INET;
1096 smask = (struct sockaddr *)&mask;
1097 bzero(&mask, sizeof(mask));
1098 mask.sin_len = sizeof(mask);
1099 mask.sin_family = AF_INET;
1100 mask.sin_addr.s_addr = ia->ia_subnetmask;
1101 ifp = ia->ia_ifp;
1102
1103 if (all) {
1104 /*
1105 * Remove all L2 entries matching given prefix.
1106 * Convert address to host representation to avoid
1107 * doing this on every callback. ia_subnetmask is already
1108 * stored in host representation.
1109 */
1110 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
1111 lltable_prefix_free(AF_INET, saddr, smask, flags);
1112 } else {
1113 /* Remove interface address only */
1114 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
1115 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
1116 }
1117 }
1118
1119 /*
1120 * If there is no other address in the system that can serve a route to the
1121 * same prefix, remove the route. Hand over the route to the new address
1122 * otherwise.
1123 */
1124 int
in_scrubprefix(struct in_ifaddr * target,u_int flags)1125 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1126 {
1127 struct epoch_tracker et;
1128 struct in_ifaddr *ia;
1129 struct in_addr prefix, mask, p, m;
1130 int error = 0;
1131
1132 /*
1133 * Remove the loopback route to the interface address.
1134 */
1135 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) {
1136 struct in_ifaddr *eia;
1137
1138 eia = in_localip_more(target);
1139
1140 if (eia != NULL) {
1141 error = ifa_switch_loopback_route((struct ifaddr *)eia,
1142 (struct sockaddr *)&target->ia_addr);
1143 ifa_free(&eia->ia_ifa);
1144 } else {
1145 error = ifa_del_loopback_route((struct ifaddr *)target,
1146 (struct sockaddr *)&target->ia_addr);
1147 }
1148 }
1149
1150 ia_getrtprefix(target, &prefix, &mask);
1151
1152 if ((target->ia_flags & IFA_ROUTE) == 0) {
1153 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1154
1155 /*
1156 * Removing address from !IFF_UP interface or
1157 * prefix which exists on other interface (along with route).
1158 * No entries should exist here except target addr.
1159 * Given that, delete this entry only.
1160 */
1161 in_scrubprefixlle(target, 0, flags);
1162 return (0);
1163 }
1164
1165 NET_EPOCH_ENTER(et);
1166 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1167 ia_getrtprefix(ia, &p, &m);
1168
1169 if (prefix.s_addr != p.s_addr ||
1170 mask.s_addr != m.s_addr)
1171 continue;
1172
1173 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1174 continue;
1175
1176 /*
1177 * If we got a matching prefix address, move IFA_ROUTE and
1178 * the route itself to it. Make sure that routing daemons
1179 * get a heads-up.
1180 */
1181 if ((ia->ia_flags & IFA_ROUTE) == 0) {
1182 ifa_ref(&ia->ia_ifa);
1183 NET_EPOCH_EXIT(et);
1184 error = in_handle_ifaddr_route(RTM_DELETE, target);
1185 if (error == 0)
1186 target->ia_flags &= ~IFA_ROUTE;
1187 else
1188 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1189 error);
1190 /* Scrub all entries IFF interface is different */
1191 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
1192 flags);
1193 error = in_handle_ifaddr_route(RTM_ADD, ia);
1194 if (error == 0)
1195 ia->ia_flags |= IFA_ROUTE;
1196 else
1197 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1198 error);
1199 ifa_free(&ia->ia_ifa);
1200 return (error);
1201 }
1202 }
1203 NET_EPOCH_EXIT(et);
1204
1205 /*
1206 * remove all L2 entries on the given prefix
1207 */
1208 in_scrubprefixlle(target, 1, flags);
1209
1210 /*
1211 * As no-one seem to have this prefix, we can remove the route.
1212 */
1213 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1214 error = in_handle_ifaddr_route(RTM_DELETE, target);
1215 if (error == 0)
1216 target->ia_flags &= ~IFA_ROUTE;
1217 else
1218 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1219 return (error);
1220 }
1221
1222 void
in_ifscrub_all(void)1223 in_ifscrub_all(void)
1224 {
1225 struct ifnet *ifp;
1226 struct ifaddr *ifa, *nifa;
1227 struct ifaliasreq ifr;
1228
1229 IFNET_RLOCK();
1230 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1231 /* Cannot lock here - lock recursion. */
1232 /* NET_EPOCH_ENTER(et); */
1233 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1234 if (ifa->ifa_addr->sa_family != AF_INET)
1235 continue;
1236
1237 /*
1238 * This is ugly but the only way for legacy IP to
1239 * cleanly remove addresses and everything attached.
1240 */
1241 bzero(&ifr, sizeof(ifr));
1242 ifr.ifra_addr = *ifa->ifa_addr;
1243 if (ifa->ifa_dstaddr)
1244 ifr.ifra_broadaddr = *ifa->ifa_dstaddr;
1245 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
1246 ifp, NULL);
1247 }
1248 /* NET_EPOCH_EXIT(et); */
1249 in_purgemaddrs(ifp);
1250 igmp_domifdetach(ifp);
1251 }
1252 IFNET_RUNLOCK();
1253 }
1254
1255 int
in_ifaddr_broadcast(struct in_addr in,struct in_ifaddr * ia)1256 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
1257 {
1258
1259 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1260 /*
1261 * Optionally check for old-style (host 0) broadcast, but
1262 * taking into account that RFC 3021 obsoletes it.
1263 */
1264 (V_broadcast_lowest && ia->ia_subnetmask != IN_RFC3021_MASK &&
1265 ntohl(in.s_addr) == ia->ia_subnet)) &&
1266 /*
1267 * Check for an all one subnetmask. These
1268 * only exist when an interface gets a secondary
1269 * address.
1270 */
1271 ia->ia_subnetmask != (u_long)0xffffffff);
1272 }
1273
1274 /*
1275 * Return 1 if the address might be a local broadcast address.
1276 */
1277 int
in_broadcast(struct in_addr in,struct ifnet * ifp)1278 in_broadcast(struct in_addr in, struct ifnet *ifp)
1279 {
1280 struct ifaddr *ifa;
1281 int found;
1282
1283 NET_EPOCH_ASSERT();
1284
1285 if (in.s_addr == INADDR_BROADCAST ||
1286 in.s_addr == INADDR_ANY)
1287 return (1);
1288 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1289 return (0);
1290 found = 0;
1291 /*
1292 * Look through the list of addresses for a match
1293 * with a broadcast address.
1294 */
1295 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1296 if (ifa->ifa_addr->sa_family == AF_INET &&
1297 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
1298 found = 1;
1299 break;
1300 }
1301 return (found);
1302 }
1303
1304 /*
1305 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1306 */
1307 void
in_ifdetach(struct ifnet * ifp)1308 in_ifdetach(struct ifnet *ifp)
1309 {
1310 IN_MULTI_LOCK();
1311 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1312 in_pcbpurgeif0(&V_udbinfo, ifp);
1313 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1314 in_purgemaddrs(ifp);
1315 IN_MULTI_UNLOCK();
1316
1317 /*
1318 * Make sure all multicast deletions invoking if_ioctl() are
1319 * completed before returning. Else we risk accessing a freed
1320 * ifnet structure pointer.
1321 */
1322 inm_release_wait(NULL);
1323 }
1324
1325 static void
in_ifnet_event(void * arg __unused,struct ifnet * ifp,int event)1326 in_ifnet_event(void *arg __unused, struct ifnet *ifp, int event)
1327 {
1328 struct epoch_tracker et;
1329 struct ifaddr *ifa;
1330 struct in_ifaddr *ia;
1331 int error;
1332
1333 NET_EPOCH_ENTER(et);
1334 switch (event) {
1335 case IFNET_EVENT_DOWN:
1336 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1337 if (ifa->ifa_addr->sa_family != AF_INET)
1338 continue;
1339 ia = (struct in_ifaddr *)ifa;
1340 if ((ia->ia_flags & IFA_ROUTE) == 0)
1341 continue;
1342 ifa_ref(ifa);
1343 /*
1344 * in_scrubprefix() kills the interface route.
1345 */
1346 in_scrubprefix(ia, 0);
1347 /*
1348 * in_ifadown gets rid of all the rest of the
1349 * routes. This is not quite the right thing
1350 * to do, but at least if we are running a
1351 * routing process they will come back.
1352 */
1353 in_ifadown(ifa, 0);
1354 ifa_free(ifa);
1355 }
1356 break;
1357
1358 case IFNET_EVENT_UP:
1359 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1360 if (ifa->ifa_addr->sa_family != AF_INET)
1361 continue;
1362 ia = (struct in_ifaddr *)ifa;
1363 if (ia->ia_flags & IFA_ROUTE)
1364 continue;
1365 ifa_ref(ifa);
1366 error = ifa_del_loopback_route(ifa, ifa->ifa_addr);
1367 rt_addrmsg(RTM_ADD, ifa, ifa->ifa_ifp->if_fib);
1368 error = in_handle_ifaddr_route(RTM_ADD, ia);
1369 if (error == 0)
1370 ia->ia_flags |= IFA_ROUTE;
1371 error = ifa_add_loopback_route(ifa, ifa->ifa_addr);
1372 ifa_free(ifa);
1373 }
1374 break;
1375 }
1376 NET_EPOCH_EXIT(et);
1377 }
1378 EVENTHANDLER_DEFINE(ifnet_event, in_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
1379
1380 /*
1381 * Delete all IPv4 multicast address records, and associated link-layer
1382 * multicast address records, associated with ifp.
1383 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1384 * XXX This should not race with ifma_protospec being set during
1385 * a new allocation, if it does, we have bigger problems.
1386 */
1387 static void
in_purgemaddrs(struct ifnet * ifp)1388 in_purgemaddrs(struct ifnet *ifp)
1389 {
1390 struct epoch_tracker et;
1391 struct in_multi_head purgeinms;
1392 struct in_multi *inm;
1393 struct ifmultiaddr *ifma;
1394
1395 SLIST_INIT(&purgeinms);
1396 IN_MULTI_LIST_LOCK();
1397
1398 /*
1399 * Extract list of in_multi associated with the detaching ifp
1400 * which the PF_INET layer is about to release.
1401 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1402 * by code further down.
1403 */
1404 IF_ADDR_WLOCK(ifp);
1405 NET_EPOCH_ENTER(et);
1406 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1407 inm = inm_ifmultiaddr_get_inm(ifma);
1408 if (inm == NULL)
1409 continue;
1410 inm_rele_locked(&purgeinms, inm);
1411 }
1412 NET_EPOCH_EXIT(et);
1413 IF_ADDR_WUNLOCK(ifp);
1414
1415 inm_release_list_deferred(&purgeinms);
1416 igmp_ifdetach(ifp);
1417 IN_MULTI_LIST_UNLOCK();
1418 }
1419
1420 struct in_llentry {
1421 struct llentry base;
1422 };
1423
1424 #define IN_LLTBL_DEFAULT_HSIZE 32
1425 #define IN_LLTBL_HASH(k, h) \
1426 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1427
1428 /*
1429 * Do actual deallocation of @lle.
1430 */
1431 static void
in_lltable_destroy_lle_unlocked(epoch_context_t ctx)1432 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1433 {
1434 struct llentry *lle;
1435
1436 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1437 LLE_LOCK_DESTROY(lle);
1438 LLE_REQ_DESTROY(lle);
1439 free(lle, M_LLTABLE);
1440 }
1441
1442 /*
1443 * Called by LLE_FREE_LOCKED when number of references
1444 * drops to zero.
1445 */
1446 static void
in_lltable_destroy_lle(struct llentry * lle)1447 in_lltable_destroy_lle(struct llentry *lle)
1448 {
1449
1450 LLE_WUNLOCK(lle);
1451 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1452 }
1453
1454 static struct llentry *
in_lltable_new(struct in_addr addr4,u_int flags)1455 in_lltable_new(struct in_addr addr4, u_int flags)
1456 {
1457 struct in_llentry *lle;
1458
1459 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1460 if (lle == NULL) /* NB: caller generates msg */
1461 return NULL;
1462
1463 /*
1464 * For IPv4 this will trigger "arpresolve" to generate
1465 * an ARP request.
1466 */
1467 lle->base.la_expire = time_uptime; /* mark expired */
1468 lle->base.r_l3addr.addr4 = addr4;
1469 lle->base.lle_refcnt = 1;
1470 lle->base.lle_free = in_lltable_destroy_lle;
1471 LLE_LOCK_INIT(&lle->base);
1472 LLE_REQ_INIT(&lle->base);
1473 callout_init(&lle->base.lle_timer, 1);
1474
1475 return (&lle->base);
1476 }
1477
1478 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1479 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1480
1481 static int
in_lltable_match_prefix(const struct sockaddr * saddr,const struct sockaddr * smask,u_int flags,struct llentry * lle)1482 in_lltable_match_prefix(const struct sockaddr *saddr,
1483 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1484 {
1485 struct in_addr addr, mask, lle_addr;
1486
1487 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1488 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1489 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1490
1491 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1492 return (0);
1493
1494 if (lle->la_flags & LLE_IFADDR) {
1495 /*
1496 * Delete LLE_IFADDR records IFF address & flag matches.
1497 * Note that addr is the interface address within prefix
1498 * being matched.
1499 * Note also we should handle 'ifdown' cases without removing
1500 * ifaddr macs.
1501 */
1502 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1503 return (1);
1504 return (0);
1505 }
1506
1507 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1508 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1509 return (1);
1510
1511 return (0);
1512 }
1513
1514 static void
in_lltable_free_entry(struct lltable * llt,struct llentry * lle)1515 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1516 {
1517 size_t pkts_dropped;
1518
1519 LLE_WLOCK_ASSERT(lle);
1520 KASSERT(llt != NULL, ("lltable is NULL"));
1521
1522 /* Unlink entry from table if not already */
1523 if ((lle->la_flags & LLE_LINKED) != 0) {
1524 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1525 lltable_unlink_entry(llt, lle);
1526 }
1527
1528 /* Drop hold queue */
1529 pkts_dropped = llentry_free(lle);
1530 ARPSTAT_ADD(dropped, pkts_dropped);
1531 }
1532
1533 static int
in_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)1534 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1535 {
1536 struct nhop_object *nh;
1537 struct in_addr addr;
1538
1539 KASSERT(l3addr->sa_family == AF_INET,
1540 ("sin_family %d", l3addr->sa_family));
1541
1542 addr = ((const struct sockaddr_in *)l3addr)->sin_addr;
1543
1544 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0);
1545 if (nh == NULL)
1546 return (EINVAL);
1547
1548 /*
1549 * If the gateway for an existing host route matches the target L3
1550 * address, which is a special route inserted by some implementation
1551 * such as MANET, and the interface is of the correct type, then
1552 * allow for ARP to proceed.
1553 */
1554 if (nh->nh_flags & NHF_GATEWAY) {
1555 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER ||
1556 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1557 memcmp(nh->gw_sa.sa_data, l3addr->sa_data,
1558 sizeof(in_addr_t)) != 0) {
1559 return (EINVAL);
1560 }
1561 }
1562
1563 /*
1564 * Make sure that at least the destination address is covered
1565 * by the route. This is for handling the case where 2 or more
1566 * interfaces have the same prefix. An incoming packet arrives
1567 * on one interface and the corresponding outgoing packet leaves
1568 * another interface.
1569 */
1570 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) {
1571 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp);
1572 struct in_addr dst_addr, mask_addr;
1573
1574 if (ia == NULL)
1575 return (EINVAL);
1576
1577 /*
1578 * ifaof_ifpforaddr() returns _best matching_ IFA.
1579 * It is possible that ifa prefix does not cover our address.
1580 * Explicitly verify and fail if that's the case.
1581 */
1582 dst_addr = IA_SIN(ia)->sin_addr;
1583 mask_addr.s_addr = htonl(ia->ia_subnetmask);
1584
1585 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr))
1586 return (EINVAL);
1587 }
1588
1589 return (0);
1590 }
1591
1592 static inline uint32_t
in_lltable_hash_dst(const struct in_addr dst,uint32_t hsize)1593 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1594 {
1595
1596 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1597 }
1598
1599 static uint32_t
in_lltable_hash(const struct llentry * lle,uint32_t hsize)1600 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1601 {
1602
1603 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1604 }
1605
1606 static void
in_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)1607 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1608 {
1609 struct sockaddr_in *sin;
1610
1611 sin = (struct sockaddr_in *)sa;
1612 bzero(sin, sizeof(*sin));
1613 sin->sin_family = AF_INET;
1614 sin->sin_len = sizeof(*sin);
1615 sin->sin_addr = lle->r_l3addr.addr4;
1616 }
1617
1618 static inline struct llentry *
in_lltable_find_dst(struct lltable * llt,struct in_addr dst)1619 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1620 {
1621 struct llentry *lle;
1622 struct llentries *lleh;
1623 u_int hashidx;
1624
1625 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1626 lleh = &llt->lle_head[hashidx];
1627 CK_LIST_FOREACH(lle, lleh, lle_next) {
1628 if (lle->la_flags & LLE_DELETED)
1629 continue;
1630 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1631 break;
1632 }
1633
1634 return (lle);
1635 }
1636
1637 static void
in_lltable_delete_entry(struct lltable * llt,struct llentry * lle)1638 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1639 {
1640
1641 lle->la_flags |= LLE_DELETED;
1642 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1643 #ifdef DIAGNOSTIC
1644 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1645 #endif
1646 llentry_free(lle);
1647 }
1648
1649 static struct llentry *
in_lltable_alloc(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1650 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1651 {
1652 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1653 struct ifnet *ifp = llt->llt_ifp;
1654 struct llentry *lle;
1655 char linkhdr[LLE_MAX_LINKHDR];
1656 size_t linkhdrsize;
1657 int lladdr_off;
1658
1659 KASSERT(l3addr->sa_family == AF_INET,
1660 ("sin_family %d", l3addr->sa_family));
1661
1662 /*
1663 * A route that covers the given address must have
1664 * been installed 1st because we are doing a resolution,
1665 * verify this.
1666 */
1667 if (!(flags & LLE_IFADDR) &&
1668 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1669 return (NULL);
1670
1671 lle = in_lltable_new(sin->sin_addr, flags);
1672 if (lle == NULL) {
1673 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1674 return (NULL);
1675 }
1676 lle->la_flags = flags;
1677 if (flags & LLE_STATIC)
1678 lle->r_flags |= RLLE_VALID;
1679 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1680 linkhdrsize = LLE_MAX_LINKHDR;
1681 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1682 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1683 in_lltable_free_entry(llt, lle);
1684 return (NULL);
1685 }
1686 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1687 lladdr_off);
1688 lle->la_flags |= LLE_STATIC;
1689 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1690 lle->la_expire = 0;
1691 }
1692
1693 return (lle);
1694 }
1695
1696 /*
1697 * Return NULL if not found or marked for deletion.
1698 * If found return lle read locked.
1699 */
1700 static struct llentry *
in_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1701 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1702 {
1703 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1704 struct llentry *lle;
1705
1706 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1707 KASSERT(l3addr->sa_family == AF_INET,
1708 ("sin_family %d", l3addr->sa_family));
1709 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1710 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1711 ("wrong lle request flags: %#x", flags));
1712
1713 lle = in_lltable_find_dst(llt, sin->sin_addr);
1714 if (lle == NULL)
1715 return (NULL);
1716 if (flags & LLE_UNLOCKED)
1717 return (lle);
1718
1719 if (flags & LLE_EXCLUSIVE)
1720 LLE_WLOCK(lle);
1721 else
1722 LLE_RLOCK(lle);
1723
1724 /*
1725 * If the afdata lock is not held, the LLE may have been unlinked while
1726 * we were blocked on the LLE lock. Check for this case.
1727 */
1728 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1729 if (flags & LLE_EXCLUSIVE)
1730 LLE_WUNLOCK(lle);
1731 else
1732 LLE_RUNLOCK(lle);
1733 return (NULL);
1734 }
1735 return (lle);
1736 }
1737
1738 static int
in_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct sysctl_req * wr)1739 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1740 struct sysctl_req *wr)
1741 {
1742 struct ifnet *ifp = llt->llt_ifp;
1743 /* XXX stack use */
1744 struct {
1745 struct rt_msghdr rtm;
1746 struct sockaddr_in sin;
1747 struct sockaddr_dl sdl;
1748 } arpc;
1749 struct sockaddr_dl *sdl;
1750 int error;
1751
1752 bzero(&arpc, sizeof(arpc));
1753 /* skip deleted entries */
1754 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1755 return (0);
1756 /* Skip if jailed and not a valid IP of the prison. */
1757 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1758 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1759 return (0);
1760 /*
1761 * produce a msg made of:
1762 * struct rt_msghdr;
1763 * struct sockaddr_in; (IPv4)
1764 * struct sockaddr_dl;
1765 */
1766 arpc.rtm.rtm_msglen = sizeof(arpc);
1767 arpc.rtm.rtm_version = RTM_VERSION;
1768 arpc.rtm.rtm_type = RTM_GET;
1769 arpc.rtm.rtm_flags = RTF_UP;
1770 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1771
1772 /* publish */
1773 if (lle->la_flags & LLE_PUB)
1774 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1775
1776 sdl = &arpc.sdl;
1777 sdl->sdl_family = AF_LINK;
1778 sdl->sdl_len = sizeof(*sdl);
1779 sdl->sdl_index = ifp->if_index;
1780 sdl->sdl_type = ifp->if_type;
1781 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1782 sdl->sdl_alen = ifp->if_addrlen;
1783 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1784 } else {
1785 sdl->sdl_alen = 0;
1786 bzero(LLADDR(sdl), ifp->if_addrlen);
1787 }
1788
1789 arpc.rtm.rtm_rmx.rmx_expire =
1790 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1791 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1792 if (lle->la_flags & LLE_STATIC)
1793 arpc.rtm.rtm_flags |= RTF_STATIC;
1794 if (lle->la_flags & LLE_IFADDR)
1795 arpc.rtm.rtm_flags |= RTF_PINNED;
1796 arpc.rtm.rtm_index = ifp->if_index;
1797 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1798
1799 return (error);
1800 }
1801
1802 static void
in_lltable_post_resolved(struct lltable * llt,struct llentry * lle)1803 in_lltable_post_resolved(struct lltable *llt, struct llentry *lle)
1804 {
1805 struct ifnet *ifp = llt->llt_ifp;
1806
1807 /* gratuitous ARP */
1808 if ((lle->la_flags & LLE_PUB) != 0)
1809 arprequest(ifp, &lle->r_l3addr.addr4, &lle->r_l3addr.addr4,
1810 lle->ll_addr);
1811 }
1812
1813 static struct lltable *
in_lltattach(struct ifnet * ifp)1814 in_lltattach(struct ifnet *ifp)
1815 {
1816 struct lltable *llt;
1817
1818 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1819 llt->llt_af = AF_INET;
1820 llt->llt_ifp = ifp;
1821
1822 llt->llt_lookup = in_lltable_lookup;
1823 llt->llt_alloc_entry = in_lltable_alloc;
1824 llt->llt_delete_entry = in_lltable_delete_entry;
1825 llt->llt_dump_entry = in_lltable_dump_entry;
1826 llt->llt_hash = in_lltable_hash;
1827 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1828 llt->llt_free_entry = in_lltable_free_entry;
1829 llt->llt_match_prefix = in_lltable_match_prefix;
1830 llt->llt_mark_used = llentry_mark_used;
1831 llt->llt_post_resolved = in_lltable_post_resolved;
1832 lltable_link(llt);
1833
1834 return (llt);
1835 }
1836
1837 struct lltable *
in_lltable_get(struct ifnet * ifp)1838 in_lltable_get(struct ifnet *ifp)
1839 {
1840 struct lltable *llt = NULL;
1841
1842 void *afdata_ptr = ifp->if_afdata[AF_INET];
1843 if (afdata_ptr != NULL)
1844 llt = ((struct in_ifinfo *)afdata_ptr)->ii_llt;
1845 return (llt);
1846 }
1847
1848 void *
in_domifattach(struct ifnet * ifp)1849 in_domifattach(struct ifnet *ifp)
1850 {
1851 struct in_ifinfo *ii;
1852
1853 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1854
1855 ii->ii_llt = in_lltattach(ifp);
1856 ii->ii_igmp = igmp_domifattach(ifp);
1857
1858 return (ii);
1859 }
1860
1861 void
in_domifdetach(struct ifnet * ifp,void * aux)1862 in_domifdetach(struct ifnet *ifp, void *aux)
1863 {
1864 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1865
1866 igmp_domifdetach(ifp);
1867 lltable_free(ii->ii_llt);
1868 free(ii, M_IFADDR);
1869 }
1870