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 forwarding of and ICMP response to 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 forwarding of and ICMP response to 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 true if an internet address is for a ``local'' host
131 * (one to which we have a connection).
132 */
133 bool
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 (true);
144 }
145
146 return (false);
147 }
148
149 /*
150 * Return true 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 true if an internet address is configured on an interface.
189 */
190 bool
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 (true);
204 }
205
206 return (false);
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 bool
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 in_nullhost(in))
281 return (false);
282 if (IN_EXPERIMENTAL(i) && !V_ip_allow_net240)
283 return (false);
284 if (IN_ZERONET(i) && !V_ip_allow_net0)
285 return (false);
286 return (true);
287 }
288
289 /*
290 * Sysctl to manage prefix of reserved loopback network; translate
291 * to/from mask. The mask is always contiguous high-order 1 bits
292 * followed by all 0 bits.
293 */
294 static int
sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)295 sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)
296 {
297 int error, preflen;
298
299 /* ffs is 1-based; compensate. */
300 preflen = 33 - ffs(V_in_loopback_mask);
301 error = sysctl_handle_int(oidp, &preflen, 0, req);
302 if (error || !req->newptr)
303 return (error);
304 if (preflen < 8 || preflen > 31)
305 return (EINVAL);
306 V_in_loopback_mask = 0xffffffff << (32 - preflen);
307 return (0);
308 }
309
310 /*
311 * Trim a mask in a sockaddr
312 */
313 static void
in_socktrim(struct sockaddr_in * ap)314 in_socktrim(struct sockaddr_in *ap)
315 {
316 char *cplim = (char *) &ap->sin_addr;
317 char *cp = (char *) (&ap->sin_addr + 1);
318
319 ap->sin_len = 0;
320 while (--cp >= cplim)
321 if (*cp) {
322 (ap)->sin_len = cp - (char *) (ap) + 1;
323 break;
324 }
325 }
326
327 /*
328 * Generic internet control operations (ioctl's).
329 */
330 int
in_control_ioctl(u_long cmd,void * data,struct ifnet * ifp,struct ucred * cred)331 in_control_ioctl(u_long cmd, void *data, struct ifnet *ifp,
332 struct ucred *cred)
333 {
334 struct ifreq *ifr = (struct ifreq *)data;
335 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
336 struct epoch_tracker et;
337 struct ifaddr *ifa;
338 struct in_ifaddr *ia;
339 int error;
340
341 if (ifp == NULL)
342 return (EADDRNOTAVAIL);
343
344 /*
345 * Filter out 4 ioctls we implement directly. Forward the rest
346 * to specific functions and ifp->if_ioctl().
347 */
348 switch (cmd) {
349 case SIOCGIFADDR:
350 case SIOCGIFBRDADDR:
351 case SIOCGIFDSTADDR:
352 case SIOCGIFNETMASK:
353 break;
354 case SIOCGIFALIAS:
355 sx_xlock(&in_control_sx);
356 error = in_gifaddr_ioctl(cmd, data, ifp, cred);
357 sx_xunlock(&in_control_sx);
358 return (error);
359 case SIOCDIFADDR:
360 sx_xlock(&in_control_sx);
361 error = in_difaddr_ioctl(cmd, data, ifp, cred);
362 sx_xunlock(&in_control_sx);
363 return (error);
364 case OSIOCAIFADDR: /* 9.x compat */
365 case SIOCAIFADDR:
366 sx_xlock(&in_control_sx);
367 error = in_aifaddr_ioctl(cmd, data, ifp, cred);
368 sx_xunlock(&in_control_sx);
369 return (error);
370 case SIOCSIFADDR:
371 case SIOCSIFBRDADDR:
372 case SIOCSIFDSTADDR:
373 case SIOCSIFNETMASK:
374 /* We no longer support that old commands. */
375 return (EINVAL);
376 default:
377 if (ifp->if_ioctl == NULL)
378 return (EOPNOTSUPP);
379 return ((*ifp->if_ioctl)(ifp, cmd, data));
380 }
381
382 if (addr->sin_addr.s_addr != INADDR_ANY &&
383 prison_check_ip4(cred, &addr->sin_addr) != 0)
384 return (EADDRNOTAVAIL);
385
386 /*
387 * Find address for this interface, if it exists. If an
388 * address was specified, find that one instead of the
389 * first one on the interface, if possible.
390 */
391 NET_EPOCH_ENTER(et);
392 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
393 if (ifa->ifa_addr->sa_family != AF_INET)
394 continue;
395 ia = (struct in_ifaddr *)ifa;
396 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
397 break;
398 }
399 if (ifa == NULL)
400 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
401 if (ifa->ifa_addr->sa_family == AF_INET) {
402 ia = (struct in_ifaddr *)ifa;
403 if (prison_check_ip4(cred,
404 &ia->ia_addr.sin_addr) == 0)
405 break;
406 }
407
408 if (ifa == NULL) {
409 NET_EPOCH_EXIT(et);
410 return (EADDRNOTAVAIL);
411 }
412
413 error = 0;
414 switch (cmd) {
415 case SIOCGIFADDR:
416 *addr = ia->ia_addr;
417 break;
418
419 case SIOCGIFBRDADDR:
420 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
421 error = EINVAL;
422 break;
423 }
424 *addr = ia->ia_broadaddr;
425 break;
426
427 case SIOCGIFDSTADDR:
428 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
429 error = EINVAL;
430 break;
431 }
432 *addr = ia->ia_dstaddr;
433 break;
434
435 case SIOCGIFNETMASK:
436 *addr = ia->ia_sockmask;
437 break;
438 }
439
440 NET_EPOCH_EXIT(et);
441
442 return (error);
443 }
444
445 int
in_mask2len(struct in_addr * mask)446 in_mask2len(struct in_addr *mask)
447 {
448 int x, y;
449 u_char *p;
450
451 p = (u_char *)mask;
452 for (x = 0; x < sizeof(*mask); x++) {
453 if (p[x] != 0xff)
454 break;
455 }
456 y = 0;
457 if (x < sizeof(*mask)) {
458 for (y = 0; y < 8; y++) {
459 if ((p[x] & (0x80 >> y)) == 0)
460 break;
461 }
462 }
463 return (x * 8 + y);
464 }
465
466 int
in_control(struct socket * so,u_long cmd,void * data,struct ifnet * ifp,struct thread * td)467 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp,
468 struct thread *td)
469 {
470 return (in_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
471 }
472
473 static int
in_aifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)474 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
475 {
476 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
477 const struct sockaddr_in *addr = &ifra->ifra_addr;
478 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
479 const struct sockaddr_in *mask = &ifra->ifra_mask;
480 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
481 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
482 struct epoch_tracker et;
483 struct ifaddr *ifa;
484 struct in_ifaddr *ia;
485 bool iaIsFirst;
486 int error = 0;
487
488 error = priv_check_cred(cred, PRIV_NET_ADDIFADDR);
489 if (error)
490 return (error);
491
492 /*
493 * ifra_addr must be present and be of INET family.
494 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
495 */
496 if (addr->sin_len != sizeof(struct sockaddr_in) ||
497 addr->sin_family != AF_INET)
498 return (EINVAL);
499 if (broadaddr->sin_len != 0 &&
500 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
501 broadaddr->sin_family != AF_INET))
502 return (EINVAL);
503 if (mask->sin_len != 0 &&
504 (mask->sin_len != sizeof(struct sockaddr_in) ||
505 mask->sin_family != AF_INET))
506 return (EINVAL);
507 if ((ifp->if_flags & IFF_POINTOPOINT) &&
508 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
509 dstaddr->sin_addr.s_addr == INADDR_ANY))
510 return (EDESTADDRREQ);
511 if (vhid != 0 && carp_attach_p == NULL)
512 return (EPROTONOSUPPORT);
513
514 #ifdef MAC
515 /* Check if a MAC policy disallows setting the IPv4 address. */
516 error = mac_inet_check_add_addr(cred, &addr->sin_addr, ifp);
517 if (error != 0)
518 return (error);
519 #endif
520
521 /*
522 * See whether address already exist.
523 */
524 iaIsFirst = true;
525 ia = NULL;
526 NET_EPOCH_ENTER(et);
527 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
528 struct in_ifaddr *it;
529
530 if (ifa->ifa_addr->sa_family != AF_INET)
531 continue;
532
533 it = (struct in_ifaddr *)ifa;
534 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
535 prison_check_ip4(cred, &addr->sin_addr) == 0)
536 ia = it;
537 else
538 iaIsFirst = false;
539 }
540 NET_EPOCH_EXIT(et);
541
542 if (ia != NULL)
543 (void )in_difaddr_ioctl(cmd, data, ifp, cred);
544
545 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
546 ia = (struct in_ifaddr *)ifa;
547 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
548 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
549 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
550 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
551 CALLOUT_RETURNUNLOCKED);
552
553 ia->ia_ifp = ifp;
554 ia->ia_addr = *addr;
555 if (mask->sin_len != 0) {
556 ia->ia_sockmask = *mask;
557 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
558 } else {
559 in_addr_t i = ntohl(addr->sin_addr.s_addr);
560
561 /*
562 * If netmask isn't supplied, use historical default.
563 * This is deprecated for interfaces other than loopback
564 * or point-to-point; warn in other cases. In the future
565 * we should return an error rather than warning.
566 */
567 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0)
568 printf("%s: set address: WARNING: network mask "
569 "should be specified; using historical default\n",
570 ifp->if_xname);
571 if (IN_CLASSA(i))
572 ia->ia_subnetmask = IN_CLASSA_NET;
573 else if (IN_CLASSB(i))
574 ia->ia_subnetmask = IN_CLASSB_NET;
575 else
576 ia->ia_subnetmask = IN_CLASSC_NET;
577 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
578 }
579 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
580 in_socktrim(&ia->ia_sockmask);
581
582 if (ifp->if_flags & IFF_BROADCAST) {
583 if (broadaddr->sin_len != 0) {
584 ia->ia_broadaddr = *broadaddr;
585 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
586 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
587 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
588 ia->ia_broadaddr.sin_family = AF_INET;
589 } else {
590 ia->ia_broadaddr.sin_addr.s_addr =
591 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
592 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
593 ia->ia_broadaddr.sin_family = AF_INET;
594 }
595 }
596
597 if (ifp->if_flags & IFF_POINTOPOINT)
598 ia->ia_dstaddr = *dstaddr;
599
600 if (vhid != 0) {
601 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
602 if (error)
603 return (error);
604 }
605
606 /* if_addrhead is already referenced by ifa_alloc() */
607 IF_ADDR_WLOCK(ifp);
608 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
609 IF_ADDR_WUNLOCK(ifp);
610
611 ifa_ref(ifa); /* in_ifaddrhead */
612 sx_assert(&in_control_sx, SA_XLOCKED);
613 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
614 CK_LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia,
615 ia_hash);
616
617 /*
618 * Give the interface a chance to initialize
619 * if this is its first address,
620 * and to validate the address if necessary.
621 */
622 if (ifp->if_ioctl != NULL) {
623 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
624 if (error)
625 goto fail1;
626 }
627
628 /*
629 * Add route for the network.
630 */
631 if (vhid == 0) {
632 error = in_addprefix(ia);
633 if (error)
634 goto fail1;
635 }
636
637 /*
638 * Add a loopback route to self.
639 */
640 if (vhid == 0 && ia_need_loopback_route(ia)) {
641 struct in_ifaddr *eia;
642
643 eia = in_localip_more(ia);
644
645 if (eia == NULL) {
646 error = ifa_add_loopback_route((struct ifaddr *)ia,
647 (struct sockaddr *)&ia->ia_addr);
648 if (error)
649 goto fail2;
650 } else
651 ifa_free(&eia->ia_ifa);
652 }
653
654 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
655 struct in_addr allhosts_addr;
656 struct in_ifinfo *ii;
657
658 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
659 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
660
661 error = in_joingroup(ifp, &allhosts_addr, NULL,
662 &ii->ii_allhosts);
663 }
664
665 /*
666 * Note: we don't need extra reference for ifa, since we called
667 * with sx lock held, and ifaddr can not be deleted in concurrent
668 * thread.
669 */
670 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
671
672 return (error);
673
674 fail2:
675 if (vhid == 0)
676 (void )in_scrubprefix(ia, LLE_STATIC);
677
678 fail1:
679 if (ia->ia_ifa.ifa_carp)
680 (*carp_detach_p)(&ia->ia_ifa, false);
681
682 IF_ADDR_WLOCK(ifp);
683 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
684 IF_ADDR_WUNLOCK(ifp);
685 ifa_free(&ia->ia_ifa); /* if_addrhead */
686
687 sx_assert(&in_control_sx, SA_XLOCKED);
688 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
689 CK_LIST_REMOVE(ia, ia_hash);
690 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
691
692 return (error);
693 }
694
695 static int
in_difaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)696 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
697 {
698 const struct ifreq *ifr = (struct ifreq *)data;
699 const struct sockaddr_in *addr = (const struct sockaddr_in *)
700 &ifr->ifr_addr;
701 struct ifaddr *ifa;
702 struct in_ifaddr *ia;
703 bool deleteAny, iaIsLast;
704 int error;
705
706 if (cred != NULL) {
707 error = priv_check_cred(cred, PRIV_NET_DELIFADDR);
708 if (error)
709 return (error);
710 }
711
712 if (addr->sin_len != sizeof(struct sockaddr_in) ||
713 addr->sin_family != AF_INET)
714 deleteAny = true;
715 else
716 deleteAny = false;
717
718 iaIsLast = true;
719 ia = NULL;
720 IF_ADDR_WLOCK(ifp);
721 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
722 struct in_ifaddr *it;
723
724 if (ifa->ifa_addr->sa_family != AF_INET)
725 continue;
726
727 it = (struct in_ifaddr *)ifa;
728 if (deleteAny && ia == NULL && (cred == NULL ||
729 prison_check_ip4(cred, &it->ia_addr.sin_addr) == 0))
730 ia = it;
731
732 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
733 (cred == NULL || prison_check_ip4(cred,
734 &addr->sin_addr) == 0))
735 ia = it;
736
737 if (it != ia)
738 iaIsLast = false;
739 }
740
741 if (ia == NULL) {
742 IF_ADDR_WUNLOCK(ifp);
743 return (EADDRNOTAVAIL);
744 }
745
746 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
747 IF_ADDR_WUNLOCK(ifp);
748 ifa_free(&ia->ia_ifa); /* if_addrhead */
749
750 sx_assert(&in_control_sx, SA_XLOCKED);
751 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
752 CK_LIST_REMOVE(ia, ia_hash);
753
754 /*
755 * in_scrubprefix() kills the interface route.
756 */
757 in_scrubprefix(ia, LLE_STATIC);
758
759 /*
760 * in_ifadown gets rid of all the rest of
761 * the routes. This is not quite the right
762 * thing to do, but at least if we are running
763 * a routing process they will come back.
764 */
765 in_ifadown(&ia->ia_ifa, 1);
766
767 if (ia->ia_ifa.ifa_carp)
768 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
769
770 /*
771 * If this is the last IPv4 address configured on this
772 * interface, leave the all-hosts group.
773 * No state-change report need be transmitted.
774 */
775 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
776 struct in_ifinfo *ii;
777
778 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
779 if (ii->ii_allhosts) {
780 (void)in_leavegroup(ii->ii_allhosts, NULL);
781 ii->ii_allhosts = NULL;
782 }
783 }
784
785 IF_ADDR_WLOCK(ifp);
786 if (callout_stop(&ia->ia_garp_timer) == 1) {
787 ifa_free(&ia->ia_ifa);
788 }
789 IF_ADDR_WUNLOCK(ifp);
790
791 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
792 IFADDR_EVENT_DEL);
793 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
794
795 return (0);
796 }
797
798 static int
in_gifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)799 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
800 {
801 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
802 const struct sockaddr_in *addr = &ifra->ifra_addr;
803 struct epoch_tracker et;
804 struct ifaddr *ifa;
805 struct in_ifaddr *ia;
806
807 /*
808 * ifra_addr must be present and be of INET family.
809 */
810 if (addr->sin_len != sizeof(struct sockaddr_in) ||
811 addr->sin_family != AF_INET)
812 return (EINVAL);
813
814 /*
815 * See whether address exist.
816 */
817 ia = NULL;
818 NET_EPOCH_ENTER(et);
819 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
820 struct in_ifaddr *it;
821
822 if (ifa->ifa_addr->sa_family != AF_INET)
823 continue;
824
825 it = (struct in_ifaddr *)ifa;
826 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
827 prison_check_ip4(cred, &addr->sin_addr) == 0) {
828 ia = it;
829 break;
830 }
831 }
832 if (ia == NULL) {
833 NET_EPOCH_EXIT(et);
834 return (EADDRNOTAVAIL);
835 }
836
837 ifra->ifra_mask = ia->ia_sockmask;
838 if ((ifp->if_flags & IFF_POINTOPOINT) &&
839 ia->ia_dstaddr.sin_family == AF_INET)
840 ifra->ifra_dstaddr = ia->ia_dstaddr;
841 else if ((ifp->if_flags & IFF_BROADCAST) &&
842 ia->ia_broadaddr.sin_family == AF_INET)
843 ifra->ifra_broadaddr = ia->ia_broadaddr;
844 else
845 memset(&ifra->ifra_broadaddr, 0,
846 sizeof(ifra->ifra_broadaddr));
847
848 NET_EPOCH_EXIT(et);
849 return (0);
850 }
851
852 static int
in_match_ifaddr(const struct rtentry * rt,const struct nhop_object * nh,void * arg)853 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
854 {
855
856 if (nh->nh_ifa == (struct ifaddr *)arg)
857 return (1);
858
859 return (0);
860 }
861
862 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)863 in_handle_prefix_route(uint32_t fibnum, int cmd,
864 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa,
865 struct ifnet *ifp)
866 {
867
868 NET_EPOCH_ASSERT();
869
870 /* Prepare gateway */
871 struct sockaddr_dl_short sdl = {
872 .sdl_family = AF_LINK,
873 .sdl_len = sizeof(struct sockaddr_dl_short),
874 .sdl_type = ifa->ifa_ifp->if_type,
875 .sdl_index = ifa->ifa_ifp->if_index,
876 };
877
878 struct rt_addrinfo info = {
879 .rti_ifa = ifa,
880 .rti_ifp = ifp,
881 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
882 .rti_info = {
883 [RTAX_DST] = (struct sockaddr *)dst,
884 [RTAX_NETMASK] = (struct sockaddr *)netmask,
885 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
886 },
887 /* Ensure we delete the prefix IFF prefix ifa matches */
888 .rti_filter = in_match_ifaddr,
889 .rti_filterdata = ifa,
890 };
891
892 return (rib_handle_ifaddr_info(fibnum, cmd, &info));
893 }
894
895 /*
896 * Routing table interaction with interface addresses.
897 *
898 * In general, two types of routes needs to be installed:
899 * a) "interface" or "prefix" route, telling user that the addresses
900 * behind the ifa prefix are reached directly.
901 * b) "loopback" route installed for the ifa address, telling user that
902 * the address belongs to local system.
903 *
904 * Handling for (a) and (b) differs in multi-fib aspects, hence they
905 * are implemented in different functions below.
906 *
907 * The cases above may intersect - /32 interface aliases results in
908 * the same prefix produced by (a) and (b). This blurs the definition
909 * of the "loopback" route and complicate interactions. The interaction
910 * table is defined below. The case numbers are used in the multiple
911 * functions below to refer to the particular test case.
912 *
913 * There can be multiple options:
914 * 1) Adding address with prefix on non-p2p/non-loopback interface.
915 * Example: 192.0.2.1/24. Action:
916 * * add "prefix" route towards 192.0.2.0/24 via @ia interface,
917 * using @ia as an address source.
918 * * add "loopback" route towards 192.0.2.1 via V_loif, saving
919 * @ia ifp in the gateway and using @ia as an address source.
920 *
921 * 2) Adding address with /32 mask to non-p2p/non-loopback interface.
922 * Example: 192.0.2.2/32. Action:
923 * * add "prefix" host route via V_loif, using @ia as an address source.
924 *
925 * 3) Adding address with or without prefix to p2p interface.
926 * Example: 10.0.0.1/24->10.0.0.2. Action:
927 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia
928 * as an address source. Note: no sense in installing full /24 as the interface
929 * is point-to-point.
930 * * add "loopback" route towards 10.0.9.1 via V_loif, saving
931 * @ia ifp in the gateway and using @ia as an address source.
932 *
933 * 4) Adding address with or without prefix to loopback interface.
934 * Example: 192.0.2.1/24. Action:
935 * * add "prefix" host route via @ia interface, using @ia as an address source.
936 * Note: Skip installing /24 prefix as it would introduce TTL loop
937 * for the traffic destined to these addresses.
938 */
939
940 /*
941 * Checks if @ia needs to install loopback route to @ia address via
942 * ifa_maintain_loopback_route().
943 *
944 * Return true on success.
945 */
946 static bool
ia_need_loopback_route(const struct in_ifaddr * ia)947 ia_need_loopback_route(const struct in_ifaddr *ia)
948 {
949 struct ifnet *ifp = ia->ia_ifp;
950
951 /* Case 4: Skip loopback interfaces */
952 if ((ifp->if_flags & IFF_LOOPBACK) ||
953 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY))
954 return (false);
955
956 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */
957 if ((ifp->if_flags & IFF_POINTOPOINT) &&
958 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
959 return (false);
960
961 /* Case 2: skip /32 prefixes */
962 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
963 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST))
964 return (false);
965
966 return (true);
967 }
968
969 /*
970 * Calculate "prefix" route corresponding to @ia.
971 */
972 static void
ia_getrtprefix(const struct in_ifaddr * ia,struct in_addr * prefix,struct in_addr * mask)973 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask)
974 {
975
976 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) {
977 /* Case 3: return host route for dstaddr */
978 *prefix = ia->ia_dstaddr.sin_addr;
979 mask->s_addr = INADDR_BROADCAST;
980 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) {
981 /* Case 4: return host route for ifaddr */
982 *prefix = ia->ia_addr.sin_addr;
983 mask->s_addr = INADDR_BROADCAST;
984 } else {
985 /* Cases 1,2: return actual ia prefix */
986 *prefix = ia->ia_addr.sin_addr;
987 *mask = ia->ia_sockmask.sin_addr;
988 prefix->s_addr &= mask->s_addr;
989 }
990 }
991
992 /*
993 * Adds or delete interface "prefix" route corresponding to @ifa.
994 * Returns 0 on success or errno.
995 */
996 static int
in_handle_ifaddr_route(int cmd,struct in_ifaddr * ia)997 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia)
998 {
999 struct ifaddr *ifa = &ia->ia_ifa;
1000 struct in_addr daddr, maddr;
1001 struct sockaddr_in *pmask;
1002 struct epoch_tracker et;
1003 int error;
1004
1005 ia_getrtprefix(ia, &daddr, &maddr);
1006
1007 struct sockaddr_in mask = {
1008 .sin_family = AF_INET,
1009 .sin_len = sizeof(struct sockaddr_in),
1010 .sin_addr = maddr,
1011 };
1012
1013 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL;
1014
1015 struct sockaddr_in dst = {
1016 .sin_family = AF_INET,
1017 .sin_len = sizeof(struct sockaddr_in),
1018 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr,
1019 };
1020
1021 struct ifnet *ifp = ia->ia_ifp;
1022
1023 if ((maddr.s_addr == INADDR_BROADCAST) &&
1024 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) {
1025 /* Case 2: host route on broadcast interface */
1026 ifp = V_loif;
1027 }
1028
1029 uint32_t fibnum = ifa->ifa_ifp->if_fib;
1030 NET_EPOCH_ENTER(et);
1031 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp);
1032 NET_EPOCH_EXIT(et);
1033
1034 return (error);
1035 }
1036
1037 /*
1038 * Check if we have a route for the given prefix already.
1039 */
1040 static bool
in_hasrtprefix(struct in_ifaddr * target)1041 in_hasrtprefix(struct in_ifaddr *target)
1042 {
1043 struct epoch_tracker et;
1044 struct in_ifaddr *ia;
1045 struct in_addr prefix, mask, p, m;
1046 bool result = false;
1047
1048 ia_getrtprefix(target, &prefix, &mask);
1049
1050 /* Look for an existing address with the same prefix, mask, and fib */
1051 NET_EPOCH_ENTER(et);
1052 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1053 ia_getrtprefix(ia, &p, &m);
1054
1055 if (prefix.s_addr != p.s_addr ||
1056 mask.s_addr != m.s_addr)
1057 continue;
1058
1059 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
1060 continue;
1061
1062 /*
1063 * If we got a matching prefix route inserted by other
1064 * interface address, we are done here.
1065 */
1066 if (ia->ia_flags & IFA_ROUTE) {
1067 result = true;
1068 break;
1069 }
1070 }
1071 NET_EPOCH_EXIT(et);
1072
1073 return (result);
1074 }
1075
1076 int
in_addprefix(struct in_ifaddr * target)1077 in_addprefix(struct in_ifaddr *target)
1078 {
1079 int error;
1080
1081 if (in_hasrtprefix(target)) {
1082 if (V_nosameprefix)
1083 return (EEXIST);
1084 else {
1085 rt_addrmsg(RTM_ADD, &target->ia_ifa,
1086 target->ia_ifp->if_fib);
1087 return (0);
1088 }
1089 }
1090
1091 /*
1092 * No-one seem to have this prefix route, so we try to insert it.
1093 */
1094 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib);
1095 error = in_handle_ifaddr_route(RTM_ADD, target);
1096 if (!error)
1097 target->ia_flags |= IFA_ROUTE;
1098 return (error);
1099 }
1100
1101 /*
1102 * Removes either all lle entries for given @ia, or lle
1103 * corresponding to @ia address.
1104 */
1105 static void
in_scrubprefixlle(struct in_ifaddr * ia,int all,u_int flags)1106 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
1107 {
1108 struct sockaddr_in addr, mask;
1109 struct sockaddr *saddr, *smask;
1110 struct ifnet *ifp;
1111
1112 saddr = (struct sockaddr *)&addr;
1113 bzero(&addr, sizeof(addr));
1114 addr.sin_len = sizeof(addr);
1115 addr.sin_family = AF_INET;
1116 smask = (struct sockaddr *)&mask;
1117 bzero(&mask, sizeof(mask));
1118 mask.sin_len = sizeof(mask);
1119 mask.sin_family = AF_INET;
1120 mask.sin_addr.s_addr = ia->ia_subnetmask;
1121 ifp = ia->ia_ifp;
1122
1123 if (all) {
1124 /*
1125 * Remove all L2 entries matching given prefix.
1126 * Convert address to host representation to avoid
1127 * doing this on every callback. ia_subnetmask is already
1128 * stored in host representation.
1129 */
1130 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
1131 lltable_prefix_free(AF_INET, saddr, smask, flags);
1132 } else {
1133 /* Remove interface address only */
1134 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
1135 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
1136 }
1137 }
1138
1139 /*
1140 * If there is no other address in the system that can serve a route to the
1141 * same prefix, remove the route. Hand over the route to the new address
1142 * otherwise.
1143 */
1144 int
in_scrubprefix(struct in_ifaddr * target,u_int flags)1145 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1146 {
1147 struct epoch_tracker et;
1148 struct in_ifaddr *ia;
1149 struct in_addr prefix, mask, p, m;
1150 int error = 0;
1151
1152 /*
1153 * Remove the loopback route to the interface address.
1154 */
1155 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) {
1156 struct in_ifaddr *eia;
1157
1158 eia = in_localip_more(target);
1159
1160 if (eia != NULL) {
1161 error = ifa_switch_loopback_route((struct ifaddr *)eia,
1162 (struct sockaddr *)&target->ia_addr);
1163 ifa_free(&eia->ia_ifa);
1164 } else {
1165 error = ifa_del_loopback_route((struct ifaddr *)target,
1166 (struct sockaddr *)&target->ia_addr);
1167 }
1168 }
1169
1170 ia_getrtprefix(target, &prefix, &mask);
1171
1172 if ((target->ia_flags & IFA_ROUTE) == 0) {
1173 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1174
1175 /*
1176 * Removing address from !IFF_UP interface or
1177 * prefix which exists on other interface (along with route).
1178 * No entries should exist here except target addr.
1179 * Given that, delete this entry only.
1180 */
1181 in_scrubprefixlle(target, 0, flags);
1182 return (0);
1183 }
1184
1185 NET_EPOCH_ENTER(et);
1186 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1187 ia_getrtprefix(ia, &p, &m);
1188
1189 if (prefix.s_addr != p.s_addr ||
1190 mask.s_addr != m.s_addr)
1191 continue;
1192
1193 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1194 continue;
1195
1196 /*
1197 * If we got a matching prefix address, move IFA_ROUTE and
1198 * the route itself to it. Make sure that routing daemons
1199 * get a heads-up.
1200 */
1201 if ((ia->ia_flags & IFA_ROUTE) == 0) {
1202 ifa_ref(&ia->ia_ifa);
1203 NET_EPOCH_EXIT(et);
1204 error = in_handle_ifaddr_route(RTM_DELETE, target);
1205 if (error == 0)
1206 target->ia_flags &= ~IFA_ROUTE;
1207 else
1208 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1209 error);
1210 /* Scrub all entries IFF interface is different */
1211 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
1212 flags);
1213 error = in_handle_ifaddr_route(RTM_ADD, ia);
1214 if (error == 0)
1215 ia->ia_flags |= IFA_ROUTE;
1216 else
1217 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1218 error);
1219 ifa_free(&ia->ia_ifa);
1220 return (error);
1221 }
1222 }
1223 NET_EPOCH_EXIT(et);
1224
1225 /*
1226 * remove all L2 entries on the given prefix
1227 */
1228 in_scrubprefixlle(target, 1, flags);
1229
1230 /*
1231 * As no-one seem to have this prefix, we can remove the route.
1232 */
1233 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1234 error = in_handle_ifaddr_route(RTM_DELETE, target);
1235 if (error == 0)
1236 target->ia_flags &= ~IFA_ROUTE;
1237 else
1238 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1239 return (error);
1240 }
1241
1242 void
in_ifscrub_all(void)1243 in_ifscrub_all(void)
1244 {
1245 struct ifnet *ifp;
1246 struct ifaddr *ifa, *nifa;
1247 struct ifreq ifr;
1248
1249 IFNET_RLOCK();
1250 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1251 /* Cannot lock here - lock recursion. */
1252 /* NET_EPOCH_ENTER(et); */
1253 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1254 if (ifa->ifa_addr->sa_family != AF_INET)
1255 continue;
1256
1257 /*
1258 * This is ugly but the only way for legacy IP to
1259 * cleanly remove addresses and everything attached.
1260 */
1261 bzero(&ifr, sizeof(ifr));
1262 ifr.ifr_addr = *ifa->ifa_addr;
1263 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
1264 ifp, NULL);
1265 }
1266 /* NET_EPOCH_EXIT(et); */
1267 in_purgemaddrs(ifp);
1268 igmp_domifdetach(ifp);
1269 }
1270 IFNET_RUNLOCK();
1271 }
1272
1273 bool
in_ifaddr_broadcast(struct in_addr in,struct in_ifaddr * ia)1274 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
1275 {
1276
1277 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1278 /*
1279 * Optionally check for old-style (host 0) broadcast, but
1280 * taking into account that RFC 3021 obsoletes it.
1281 */
1282 __predict_false(V_broadcast_lowest &&
1283 ia->ia_subnetmask != IN_RFC3021_MASK &&
1284 ntohl(in.s_addr) == ia->ia_subnet)) &&
1285 /*
1286 * Check for an all one subnetmask. These
1287 * only exist when an interface gets a secondary
1288 * address.
1289 */
1290 ia->ia_subnetmask != (u_long)0xffffffff);
1291 }
1292
1293 /*
1294 * Return true if the address might be a local broadcast address.
1295 */
1296 bool
in_ifnet_broadcast(struct in_addr in,struct ifnet * ifp)1297 in_ifnet_broadcast(struct in_addr in, struct ifnet *ifp)
1298 {
1299 struct ifaddr *ifa;
1300
1301 NET_EPOCH_ASSERT();
1302
1303 if (in_broadcast(in))
1304 return (true);
1305 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1306 return (false);
1307 /*
1308 * Look through the list of addresses for a match
1309 * with a broadcast address.
1310 */
1311 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1312 if (ifa->ifa_addr->sa_family == AF_INET &&
1313 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa))
1314 return (true);
1315 return (false);
1316 }
1317
1318 /*
1319 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1320 */
1321 void
in_ifdetach(struct ifnet * ifp)1322 in_ifdetach(struct ifnet *ifp)
1323 {
1324 IN_MULTI_LOCK();
1325 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1326 in_pcbpurgeif0(&V_udbinfo, ifp);
1327 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1328 in_purgemaddrs(ifp);
1329 IN_MULTI_UNLOCK();
1330
1331 /*
1332 * Make sure all multicast deletions invoking if_ioctl() are
1333 * completed before returning. Else we risk accessing a freed
1334 * ifnet structure pointer.
1335 */
1336 inm_release_wait(NULL);
1337 }
1338
1339 static void
in_ifnet_event(void * arg __unused,struct ifnet * ifp,int event)1340 in_ifnet_event(void *arg __unused, struct ifnet *ifp, int event)
1341 {
1342 struct epoch_tracker et;
1343 struct ifaddr *ifa;
1344 struct in_ifaddr *ia;
1345 int error;
1346
1347 NET_EPOCH_ENTER(et);
1348 switch (event) {
1349 case IFNET_EVENT_DOWN:
1350 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1351 if (ifa->ifa_addr->sa_family != AF_INET)
1352 continue;
1353 ia = (struct in_ifaddr *)ifa;
1354 if ((ia->ia_flags & IFA_ROUTE) == 0)
1355 continue;
1356 ifa_ref(ifa);
1357 /*
1358 * in_scrubprefix() kills the interface route.
1359 */
1360 in_scrubprefix(ia, 0);
1361 /*
1362 * in_ifadown gets rid of all the rest of the
1363 * routes. This is not quite the right thing
1364 * to do, but at least if we are running a
1365 * routing process they will come back.
1366 */
1367 in_ifadown(ifa, 0);
1368 ifa_free(ifa);
1369 }
1370 break;
1371
1372 case IFNET_EVENT_UP:
1373 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1374 if (ifa->ifa_addr->sa_family != AF_INET)
1375 continue;
1376 ia = (struct in_ifaddr *)ifa;
1377 if (ia->ia_flags & IFA_ROUTE)
1378 continue;
1379 ifa_ref(ifa);
1380 error = ifa_del_loopback_route(ifa, ifa->ifa_addr);
1381 rt_addrmsg(RTM_ADD, ifa, ifa->ifa_ifp->if_fib);
1382 error = in_handle_ifaddr_route(RTM_ADD, ia);
1383 if (error == 0)
1384 ia->ia_flags |= IFA_ROUTE;
1385 error = ifa_add_loopback_route(ifa, ifa->ifa_addr);
1386 ifa_free(ifa);
1387 }
1388 break;
1389 }
1390 NET_EPOCH_EXIT(et);
1391 }
1392 EVENTHANDLER_DEFINE(ifnet_event, in_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
1393
1394 /*
1395 * Delete all IPv4 multicast address records, and associated link-layer
1396 * multicast address records, associated with ifp.
1397 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1398 * XXX This should not race with ifma_protospec being set during
1399 * a new allocation, if it does, we have bigger problems.
1400 */
1401 static void
in_purgemaddrs(struct ifnet * ifp)1402 in_purgemaddrs(struct ifnet *ifp)
1403 {
1404 struct epoch_tracker et;
1405 struct in_multi_head purgeinms;
1406 struct in_multi *inm;
1407 struct ifmultiaddr *ifma;
1408
1409 SLIST_INIT(&purgeinms);
1410 IN_MULTI_LIST_LOCK();
1411
1412 /*
1413 * Extract list of in_multi associated with the detaching ifp
1414 * which the PF_INET layer is about to release.
1415 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1416 * by code further down.
1417 */
1418 IF_ADDR_WLOCK(ifp);
1419 NET_EPOCH_ENTER(et);
1420 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1421 inm = inm_ifmultiaddr_get_inm(ifma);
1422 if (inm == NULL)
1423 continue;
1424 inm_rele_locked(&purgeinms, inm);
1425 }
1426 NET_EPOCH_EXIT(et);
1427 IF_ADDR_WUNLOCK(ifp);
1428
1429 inm_release_list_deferred(&purgeinms);
1430 igmp_ifdetach(ifp);
1431 IN_MULTI_LIST_UNLOCK();
1432 }
1433
1434 struct in_llentry {
1435 struct llentry base;
1436 };
1437
1438 #define IN_LLTBL_DEFAULT_HSIZE 32
1439 #define IN_LLTBL_HASH(k, h) \
1440 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1441
1442 /*
1443 * Do actual deallocation of @lle.
1444 */
1445 static void
in_lltable_destroy_lle_unlocked(epoch_context_t ctx)1446 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1447 {
1448 struct llentry *lle;
1449
1450 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1451 LLE_LOCK_DESTROY(lle);
1452 LLE_REQ_DESTROY(lle);
1453 free(lle, M_LLTABLE);
1454 }
1455
1456 /*
1457 * Called by LLE_FREE_LOCKED when number of references
1458 * drops to zero.
1459 */
1460 static void
in_lltable_destroy_lle(struct llentry * lle)1461 in_lltable_destroy_lle(struct llentry *lle)
1462 {
1463
1464 LLE_WUNLOCK(lle);
1465 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1466 }
1467
1468 static struct llentry *
in_lltable_new(struct in_addr addr4,u_int flags)1469 in_lltable_new(struct in_addr addr4, u_int flags)
1470 {
1471 struct in_llentry *lle;
1472
1473 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1474 if (lle == NULL) /* NB: caller generates msg */
1475 return NULL;
1476
1477 /*
1478 * For IPv4 this will trigger "arpresolve" to generate
1479 * an ARP request.
1480 */
1481 lle->base.la_expire = time_uptime; /* mark expired */
1482 lle->base.r_l3addr.addr4 = addr4;
1483 lle->base.lle_refcnt = 1;
1484 lle->base.lle_free = in_lltable_destroy_lle;
1485 LLE_LOCK_INIT(&lle->base);
1486 LLE_REQ_INIT(&lle->base);
1487 callout_init(&lle->base.lle_timer, 1);
1488
1489 return (&lle->base);
1490 }
1491
1492 static int
in_lltable_match_prefix(const struct sockaddr * saddr,const struct sockaddr * smask,u_int flags,struct llentry * lle)1493 in_lltable_match_prefix(const struct sockaddr *saddr,
1494 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1495 {
1496 struct in_addr addr, mask, lle_addr;
1497
1498 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1499 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1500 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1501
1502 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1503 return (0);
1504
1505 if (lle->la_flags & LLE_IFADDR) {
1506 /*
1507 * Delete LLE_IFADDR records IFF address & flag matches.
1508 * Note that addr is the interface address within prefix
1509 * being matched.
1510 * Note also we should handle 'ifdown' cases without removing
1511 * ifaddr macs.
1512 */
1513 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1514 return (1);
1515 return (0);
1516 }
1517
1518 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1519 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1520 return (1);
1521
1522 return (0);
1523 }
1524
1525 static void
in_lltable_free_entry(struct lltable * llt,struct llentry * lle)1526 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1527 {
1528 size_t pkts_dropped;
1529
1530 LLE_WLOCK_ASSERT(lle);
1531 KASSERT(llt != NULL, ("lltable is NULL"));
1532
1533 /* Unlink entry from table if not already */
1534 if ((lle->la_flags & LLE_LINKED) != 0) {
1535 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1536 lltable_unlink_entry(llt, lle);
1537 }
1538
1539 /* Drop hold queue */
1540 pkts_dropped = llentry_free(lle);
1541 ARPSTAT_ADD(dropped, pkts_dropped);
1542 }
1543
1544 static int
in_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)1545 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1546 {
1547 struct nhop_object *nh;
1548 struct in_addr addr;
1549
1550 KASSERT(l3addr->sa_family == AF_INET,
1551 ("sin_family %d", l3addr->sa_family));
1552
1553 addr = ((const struct sockaddr_in *)l3addr)->sin_addr;
1554
1555 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0);
1556 if (nh == NULL)
1557 return (EINVAL);
1558
1559 /*
1560 * If the gateway for an existing host route matches the target L3
1561 * address, which is a special route inserted by some implementation
1562 * such as MANET, and the interface is of the correct type, then
1563 * allow for ARP to proceed.
1564 */
1565 if (nh->nh_flags & NHF_GATEWAY) {
1566 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER ||
1567 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1568 memcmp(nh->gw_sa.sa_data, l3addr->sa_data,
1569 sizeof(in_addr_t)) != 0) {
1570 return (EINVAL);
1571 }
1572 }
1573
1574 /*
1575 * Make sure that at least the destination address is covered
1576 * by the route. This is for handling the case where 2 or more
1577 * interfaces have the same prefix. An incoming packet arrives
1578 * on one interface and the corresponding outgoing packet leaves
1579 * another interface.
1580 */
1581 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) {
1582 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp);
1583 struct in_addr dst_addr, mask_addr;
1584
1585 if (ia == NULL)
1586 return (EINVAL);
1587
1588 /*
1589 * ifaof_ifpforaddr() returns _best matching_ IFA.
1590 * It is possible that ifa prefix does not cover our address.
1591 * Explicitly verify and fail if that's the case.
1592 */
1593 dst_addr = IA_SIN(ia)->sin_addr;
1594 mask_addr.s_addr = htonl(ia->ia_subnetmask);
1595
1596 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr))
1597 return (EINVAL);
1598 }
1599
1600 return (0);
1601 }
1602
1603 static inline uint32_t
in_lltable_hash_dst(const struct in_addr dst,uint32_t hsize)1604 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1605 {
1606
1607 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1608 }
1609
1610 static uint32_t
in_lltable_hash(const struct llentry * lle,uint32_t hsize)1611 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1612 {
1613
1614 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1615 }
1616
1617 static void
in_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)1618 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1619 {
1620 struct sockaddr_in *sin;
1621
1622 sin = (struct sockaddr_in *)sa;
1623 bzero(sin, sizeof(*sin));
1624 sin->sin_family = AF_INET;
1625 sin->sin_len = sizeof(*sin);
1626 sin->sin_addr = lle->r_l3addr.addr4;
1627 }
1628
1629 static inline struct llentry *
in_lltable_find_dst(struct lltable * llt,struct in_addr dst)1630 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1631 {
1632 struct llentry *lle;
1633 struct llentries *lleh;
1634 u_int hashidx;
1635
1636 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1637 lleh = &llt->lle_head[hashidx];
1638 CK_LIST_FOREACH(lle, lleh, lle_next) {
1639 if (lle->la_flags & LLE_DELETED)
1640 continue;
1641 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1642 break;
1643 }
1644
1645 return (lle);
1646 }
1647
1648 static void
in_lltable_delete_entry(struct lltable * llt,struct llentry * lle)1649 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1650 {
1651
1652 lle->la_flags |= LLE_DELETED;
1653 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1654 #ifdef DIAGNOSTIC
1655 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1656 #endif
1657 llentry_free(lle);
1658 }
1659
1660 static struct llentry *
in_lltable_alloc(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1661 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1662 {
1663 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1664 struct ifnet *ifp = llt->llt_ifp;
1665 struct llentry *lle;
1666 char linkhdr[LLE_MAX_LINKHDR];
1667 size_t linkhdrsize;
1668 int lladdr_off;
1669
1670 KASSERT(l3addr->sa_family == AF_INET,
1671 ("sin_family %d", l3addr->sa_family));
1672
1673 /*
1674 * A route that covers the given address must have
1675 * been installed 1st because we are doing a resolution,
1676 * verify this.
1677 */
1678 if (!(flags & LLE_IFADDR) &&
1679 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1680 return (NULL);
1681
1682 lle = in_lltable_new(sin->sin_addr, flags);
1683 if (lle == NULL) {
1684 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1685 return (NULL);
1686 }
1687 lle->la_flags = flags;
1688 if (flags & LLE_STATIC)
1689 lle->r_flags |= RLLE_VALID;
1690 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1691 linkhdrsize = LLE_MAX_LINKHDR;
1692 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1693 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1694 in_lltable_free_entry(llt, lle);
1695 return (NULL);
1696 }
1697 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1698 lladdr_off);
1699 lle->la_flags |= LLE_STATIC;
1700 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1701 lle->la_expire = 0;
1702 }
1703
1704 return (lle);
1705 }
1706
1707 /*
1708 * Return NULL if not found or marked for deletion.
1709 * If found return lle read locked.
1710 */
1711 static struct llentry *
in_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1712 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1713 {
1714 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1715 struct llentry *lle;
1716
1717 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1718 KASSERT(l3addr->sa_family == AF_INET,
1719 ("sin_family %d", l3addr->sa_family));
1720 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1721 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1722 ("wrong lle request flags: %#x", flags));
1723
1724 lle = in_lltable_find_dst(llt, sin->sin_addr);
1725 if (lle == NULL)
1726 return (NULL);
1727 if (flags & LLE_UNLOCKED)
1728 return (lle);
1729
1730 if (flags & LLE_EXCLUSIVE)
1731 LLE_WLOCK(lle);
1732 else
1733 LLE_RLOCK(lle);
1734
1735 /*
1736 * If the afdata lock is not held, the LLE may have been unlinked while
1737 * we were blocked on the LLE lock. Check for this case.
1738 */
1739 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1740 if (flags & LLE_EXCLUSIVE)
1741 LLE_WUNLOCK(lle);
1742 else
1743 LLE_RUNLOCK(lle);
1744 return (NULL);
1745 }
1746 return (lle);
1747 }
1748
1749 static int
in_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct sysctl_req * wr)1750 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1751 struct sysctl_req *wr)
1752 {
1753 struct ifnet *ifp = llt->llt_ifp;
1754 /* XXX stack use */
1755 struct {
1756 struct rt_msghdr rtm;
1757 struct sockaddr_in sin;
1758 struct sockaddr_dl sdl;
1759 } arpc;
1760 struct sockaddr_dl *sdl;
1761 int error;
1762
1763 bzero(&arpc, sizeof(arpc));
1764 /* skip deleted entries */
1765 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1766 return (0);
1767 /* Skip if jailed and not a valid IP of the prison. */
1768 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1769 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1770 return (0);
1771 /*
1772 * produce a msg made of:
1773 * struct rt_msghdr;
1774 * struct sockaddr_in; (IPv4)
1775 * struct sockaddr_dl;
1776 */
1777 arpc.rtm.rtm_msglen = sizeof(arpc);
1778 arpc.rtm.rtm_version = RTM_VERSION;
1779 arpc.rtm.rtm_type = RTM_GET;
1780 arpc.rtm.rtm_flags = RTF_UP;
1781 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1782
1783 /* publish */
1784 if (lle->la_flags & LLE_PUB)
1785 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1786
1787 sdl = &arpc.sdl;
1788 sdl->sdl_family = AF_LINK;
1789 sdl->sdl_len = sizeof(*sdl);
1790 sdl->sdl_index = ifp->if_index;
1791 sdl->sdl_type = ifp->if_type;
1792 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1793 sdl->sdl_alen = ifp->if_addrlen;
1794 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1795 } else {
1796 sdl->sdl_alen = 0;
1797 bzero(LLADDR(sdl), ifp->if_addrlen);
1798 }
1799
1800 arpc.rtm.rtm_rmx.rmx_expire =
1801 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1802 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1803 if (lle->la_flags & LLE_STATIC)
1804 arpc.rtm.rtm_flags |= RTF_STATIC;
1805 if (lle->la_flags & LLE_IFADDR)
1806 arpc.rtm.rtm_flags |= RTF_PINNED;
1807 arpc.rtm.rtm_index = ifp->if_index;
1808 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1809
1810 return (error);
1811 }
1812
1813 static void
in_lltable_post_resolved(struct lltable * llt,struct llentry * lle)1814 in_lltable_post_resolved(struct lltable *llt, struct llentry *lle)
1815 {
1816 struct ifnet *ifp = llt->llt_ifp;
1817
1818 /* gratuitous ARP */
1819 if ((lle->la_flags & LLE_PUB) != 0)
1820 arprequest(ifp, &lle->r_l3addr.addr4, &lle->r_l3addr.addr4,
1821 lle->ll_addr);
1822 }
1823
1824 static struct lltable *
in_lltattach(struct ifnet * ifp)1825 in_lltattach(struct ifnet *ifp)
1826 {
1827 struct lltable *llt;
1828
1829 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1830 llt->llt_af = AF_INET;
1831 llt->llt_ifp = ifp;
1832
1833 llt->llt_lookup = in_lltable_lookup;
1834 llt->llt_alloc_entry = in_lltable_alloc;
1835 llt->llt_delete_entry = in_lltable_delete_entry;
1836 llt->llt_dump_entry = in_lltable_dump_entry;
1837 llt->llt_hash = in_lltable_hash;
1838 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1839 llt->llt_free_entry = in_lltable_free_entry;
1840 llt->llt_match_prefix = in_lltable_match_prefix;
1841 llt->llt_mark_used = llentry_mark_used;
1842 llt->llt_post_resolved = in_lltable_post_resolved;
1843 lltable_link(llt);
1844
1845 return (llt);
1846 }
1847
1848 struct lltable *
in_lltable_get(struct ifnet * ifp)1849 in_lltable_get(struct ifnet *ifp)
1850 {
1851 struct lltable *llt = NULL;
1852
1853 void *afdata_ptr = ifp->if_afdata[AF_INET];
1854 if (afdata_ptr != NULL)
1855 llt = ((struct in_ifinfo *)afdata_ptr)->ii_llt;
1856 return (llt);
1857 }
1858
1859 void *
in_domifattach(struct ifnet * ifp)1860 in_domifattach(struct ifnet *ifp)
1861 {
1862 struct in_ifinfo *ii;
1863
1864 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1865
1866 ii->ii_llt = in_lltattach(ifp);
1867 ii->ii_igmp = igmp_domifattach(ifp);
1868
1869 return (ii);
1870 }
1871
1872 void
in_domifdetach(struct ifnet * ifp,void * aux)1873 in_domifdetach(struct ifnet *ifp, void *aux)
1874 {
1875 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1876
1877 igmp_domifdetach(ifp);
1878 lltable_free(ii->ii_llt);
1879 free(ii, M_IFADDR);
1880 }
1881