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/if_bridgevar.h>
61 #include <net/route.h>
62 #include <net/route/nhop.h>
63 #include <net/route/route_ctl.h>
64 #include <net/vnet.h>
65
66 #include <netinet/if_ether.h>
67 #include <netinet/in.h>
68 #include <netinet/in_fib.h>
69 #include <netinet/in_var.h>
70 #include <netinet/in_pcb.h>
71 #include <netinet/ip_var.h>
72 #include <netinet/ip_carp.h>
73 #include <netinet/igmp_var.h>
74 #include <netinet/udp.h>
75 #include <netinet/udp_var.h>
76
77 #ifdef MAC
78 #include <security/mac/mac_framework.h>
79 #endif
80
81 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
82 static int in_difaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
83 static int in_gifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct ucred *);
84
85 static void in_socktrim(struct sockaddr_in *);
86 static void in_purgemaddrs(struct ifnet *);
87
88 static bool ia_need_loopback_route(const struct in_ifaddr *);
89
90 VNET_DEFINE_STATIC(int, nosameprefix);
91 #define V_nosameprefix VNET(nosameprefix)
92 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
93 &VNET_NAME(nosameprefix), 0,
94 "Refuse to create same prefixes on different interfaces");
95
96 VNET_DEFINE_STATIC(bool, broadcast_lowest);
97 #define V_broadcast_lowest VNET(broadcast_lowest)
98 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, broadcast_lowest, CTLFLAG_VNET | CTLFLAG_RW,
99 &VNET_NAME(broadcast_lowest), 0,
100 "Treat lowest address on a subnet (host 0) as broadcast");
101
102 VNET_DEFINE(bool, ip_allow_net240) = false;
103 #define V_ip_allow_net240 VNET(ip_allow_net240)
104 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net240,
105 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net240), 0,
106 "Allow forwarding of and ICMP response to Experimental addresses, aka Class E (240/4)");
107 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-240 */
108
109 VNET_DEFINE(bool, ip_allow_net0) = false;
110 SYSCTL_BOOL(_net_inet_ip, OID_AUTO, allow_net0,
111 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_allow_net0), 0,
112 "Allow forwarding of and ICMP response to addresses in network 0/8");
113 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-0 */
114
115 VNET_DEFINE(uint32_t, in_loopback_mask) = IN_LOOPBACK_MASK_DFLT;
116 #define V_in_loopback_mask VNET(in_loopback_mask)
117 static int sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS);
118 SYSCTL_PROC(_net_inet_ip, OID_AUTO, loopback_prefixlen,
119 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW,
120 NULL, 0, sysctl_loopback_prefixlen, "I",
121 "Prefix length of address space reserved for loopback");
122 /* see https://datatracker.ietf.org/doc/draft-schoen-intarea-unicast-127 */
123
124 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
125 #define V_ripcbinfo VNET(ripcbinfo)
126
127 static struct sx in_control_sx;
128 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
129
130 /*
131 * Return true if an internet address is for a ``local'' host
132 * (one to which we have a connection).
133 */
134 bool
in_localaddr(struct in_addr in)135 in_localaddr(struct in_addr in)
136 {
137 u_long i = ntohl(in.s_addr);
138 struct in_ifaddr *ia;
139
140 NET_EPOCH_ASSERT();
141
142 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
143 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
144 return (true);
145 }
146
147 return (false);
148 }
149
150 /*
151 * Return true if an internet address is for the local host and configured
152 * on one of its interfaces.
153 */
154 bool
in_localip(struct in_addr in)155 in_localip(struct in_addr in)
156 {
157 struct in_ifaddr *ia;
158
159 NET_EPOCH_ASSERT();
160
161 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
162 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr)
163 return (true);
164
165 return (false);
166 }
167
168 /*
169 * Like in_localip(), but FIB-aware and carp(4)-aware.
170 */
171 bool
in_localip_fib(struct in_addr in,uint16_t fib)172 in_localip_fib(struct in_addr in, uint16_t fib)
173 {
174 struct in_ifaddr *ia;
175
176 NET_EPOCH_ASSERT();
177
178 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
179 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr &&
180 (ia->ia_ifa.ifa_carp == NULL ||
181 carp_master_p(&ia->ia_ifa)) &&
182 ia->ia_ifa.ifa_ifp->if_fib == fib)
183 return (true);
184
185 return (false);
186 }
187
188 /*
189 * Return true if an internet address is configured on an interface.
190 */
191 bool
in_ifhasaddr(struct ifnet * ifp,struct in_addr in)192 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
193 {
194 struct ifaddr *ifa;
195 struct in_ifaddr *ia;
196
197 NET_EPOCH_ASSERT();
198
199 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
200 if (ifa->ifa_addr->sa_family != AF_INET)
201 continue;
202 ia = (struct in_ifaddr *)ifa;
203 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
204 return (true);
205 }
206
207 return (false);
208 }
209
210 /*
211 * Return a reference to the interface address which is different to
212 * the supplied one but with same IP address value.
213 */
214 static struct in_ifaddr *
in_localip_more(struct in_ifaddr * original_ia)215 in_localip_more(struct in_ifaddr *original_ia)
216 {
217 struct epoch_tracker et;
218 in_addr_t original_addr = IA_SIN(original_ia)->sin_addr.s_addr;
219 uint32_t original_fib = original_ia->ia_ifa.ifa_ifp->if_fib;
220 struct in_ifaddr *ia;
221
222 NET_EPOCH_ENTER(et);
223 CK_LIST_FOREACH(ia, INADDR_HASH(original_addr), ia_hash) {
224 in_addr_t addr = IA_SIN(ia)->sin_addr.s_addr;
225 uint32_t fib = ia->ia_ifa.ifa_ifp->if_fib;
226 if (!V_rt_add_addr_allfibs && (original_fib != fib))
227 continue;
228 if ((original_ia != ia) && (original_addr == addr)) {
229 ifa_ref(&ia->ia_ifa);
230 NET_EPOCH_EXIT(et);
231 return (ia);
232 }
233 }
234 NET_EPOCH_EXIT(et);
235
236 return (NULL);
237 }
238
239 /*
240 * Tries to find first IPv4 address in the provided fib.
241 * Prefers non-loopback addresses and return loopback IFF
242 * @loopback_ok is set.
243 *
244 * Returns ifa or NULL.
245 */
246 struct in_ifaddr *
in_findlocal(uint32_t fibnum,bool loopback_ok)247 in_findlocal(uint32_t fibnum, bool loopback_ok)
248 {
249 struct in_ifaddr *ia = NULL, *ia_lo = NULL;
250
251 NET_EPOCH_ASSERT();
252
253 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
254 uint32_t ia_fib = ia->ia_ifa.ifa_ifp->if_fib;
255 if (!V_rt_add_addr_allfibs && (fibnum != ia_fib))
256 continue;
257
258 if (!IN_LOOPBACK(ntohl(IA_SIN(ia)->sin_addr.s_addr)))
259 break;
260 if (loopback_ok)
261 ia_lo = ia;
262 }
263
264 if (ia == NULL)
265 ia = ia_lo;
266
267 return (ia);
268 }
269
270 /*
271 * Determine whether an IP address is in a reserved set of addresses
272 * that may not be forwarded, or whether datagrams to that destination
273 * may be forwarded.
274 */
275 bool
in_canforward(struct in_addr in)276 in_canforward(struct in_addr in)
277 {
278 u_long i = ntohl(in.s_addr);
279
280 if (IN_MULTICAST(i) || IN_LINKLOCAL(i) || IN_LOOPBACK(i) ||
281 in_nullhost(in))
282 return (false);
283 if (IN_EXPERIMENTAL(i) && !V_ip_allow_net240)
284 return (false);
285 if (IN_ZERONET(i) && !V_ip_allow_net0)
286 return (false);
287 return (true);
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_mask2len(struct in_addr * mask)447 in_mask2len(struct in_addr *mask)
448 {
449 int x, y;
450 u_char *p;
451
452 p = (u_char *)mask;
453 for (x = 0; x < sizeof(*mask); x++) {
454 if (p[x] != 0xff)
455 break;
456 }
457 y = 0;
458 if (x < sizeof(*mask)) {
459 for (y = 0; y < 8; y++) {
460 if ((p[x] & (0x80 >> y)) == 0)
461 break;
462 }
463 }
464 return (x * 8 + y);
465 }
466
467 int
in_control(struct socket * so,u_long cmd,void * data,struct ifnet * ifp,struct thread * td)468 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp,
469 struct thread *td)
470 {
471 return (in_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
472 }
473
474 static int
in_aifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)475 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
476 {
477 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
478 const struct sockaddr_in *addr = &ifra->ifra_addr;
479 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
480 const struct sockaddr_in *mask = &ifra->ifra_mask;
481 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
482 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
483 struct epoch_tracker et;
484 struct ifaddr *ifa;
485 struct in_ifaddr *ia;
486 bool iaIsFirst;
487 int error = 0;
488
489 error = priv_check_cred(cred, PRIV_NET_ADDIFADDR);
490 if (error)
491 return (error);
492
493 /*
494 * ifra_addr must be present and be of INET family.
495 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
496 */
497 if (addr->sin_len != sizeof(struct sockaddr_in) ||
498 addr->sin_family != AF_INET)
499 return (EINVAL);
500 if (broadaddr->sin_len != 0 &&
501 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
502 broadaddr->sin_family != AF_INET))
503 return (EINVAL);
504 if (mask->sin_len != 0 &&
505 (mask->sin_len != sizeof(struct sockaddr_in) ||
506 mask->sin_family != AF_INET))
507 return (EINVAL);
508 if ((ifp->if_flags & IFF_POINTOPOINT) &&
509 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
510 dstaddr->sin_addr.s_addr == INADDR_ANY))
511 return (EDESTADDRREQ);
512 if (vhid != 0 && carp_attach_p == NULL)
513 return (EPROTONOSUPPORT);
514
515 #ifdef MAC
516 /* Check if a MAC policy disallows setting the IPv4 address. */
517 error = mac_inet_check_add_addr(cred, &addr->sin_addr, ifp);
518 if (error != 0)
519 return (error);
520 #endif
521
522 /*
523 * Check if bridge wants to allow adding addrs to member interfaces.
524 */
525 if (ifp->if_bridge && bridge_member_ifaddrs_p &&
526 !bridge_member_ifaddrs_p())
527 return (EINVAL);
528
529 /*
530 * See whether address already exist.
531 */
532 iaIsFirst = true;
533 ia = NULL;
534 NET_EPOCH_ENTER(et);
535 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
536 struct in_ifaddr *it;
537
538 if (ifa->ifa_addr->sa_family != AF_INET)
539 continue;
540
541 it = (struct in_ifaddr *)ifa;
542 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
543 prison_check_ip4(cred, &addr->sin_addr) == 0)
544 ia = it;
545 else
546 iaIsFirst = false;
547 }
548 NET_EPOCH_EXIT(et);
549
550 if (ia != NULL)
551 (void )in_difaddr_ioctl(cmd, data, ifp, cred);
552
553 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
554 ia = (struct in_ifaddr *)ifa;
555 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
556 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
557 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
558 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
559 CALLOUT_RETURNUNLOCKED);
560
561 ia->ia_ifp = ifp;
562 ia->ia_addr = *addr;
563 if (mask->sin_len != 0) {
564 ia->ia_sockmask = *mask;
565 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
566 } else {
567 in_addr_t i = ntohl(addr->sin_addr.s_addr);
568
569 /*
570 * If netmask isn't supplied, use historical default.
571 * This is deprecated for interfaces other than loopback
572 * or point-to-point; warn in other cases. In the future
573 * we should return an error rather than warning.
574 */
575 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0)
576 printf("%s: set address: WARNING: network mask "
577 "should be specified; using historical default\n",
578 ifp->if_xname);
579 if (IN_CLASSA(i))
580 ia->ia_subnetmask = IN_CLASSA_NET;
581 else if (IN_CLASSB(i))
582 ia->ia_subnetmask = IN_CLASSB_NET;
583 else
584 ia->ia_subnetmask = IN_CLASSC_NET;
585 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
586 }
587 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
588 in_socktrim(&ia->ia_sockmask);
589
590 if (ifp->if_flags & IFF_BROADCAST) {
591 if (broadaddr->sin_len != 0) {
592 ia->ia_broadaddr = *broadaddr;
593 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
594 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
595 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
596 ia->ia_broadaddr.sin_family = AF_INET;
597 } else {
598 ia->ia_broadaddr.sin_addr.s_addr =
599 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
600 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
601 ia->ia_broadaddr.sin_family = AF_INET;
602 }
603 }
604
605 if (ifp->if_flags & IFF_POINTOPOINT)
606 ia->ia_dstaddr = *dstaddr;
607
608 if (vhid != 0) {
609 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
610 if (error)
611 return (error);
612 }
613
614 /* if_addrhead is already referenced by ifa_alloc() */
615 IF_ADDR_WLOCK(ifp);
616 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
617 IF_ADDR_WUNLOCK(ifp);
618
619 ifa_ref(ifa); /* in_ifaddrhead */
620 sx_assert(&in_control_sx, SA_XLOCKED);
621 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
622 CK_LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia,
623 ia_hash);
624
625 /*
626 * Give the interface a chance to initialize
627 * if this is its first address,
628 * and to validate the address if necessary.
629 */
630 if (ifp->if_ioctl != NULL) {
631 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
632 if (error)
633 goto fail1;
634 }
635
636 /*
637 * Add route for the network.
638 */
639 if (vhid == 0) {
640 error = in_addprefix(ia);
641 if (error)
642 goto fail1;
643 }
644
645 /*
646 * Add a loopback route to self.
647 */
648 if (vhid == 0 && ia_need_loopback_route(ia)) {
649 struct in_ifaddr *eia;
650
651 eia = in_localip_more(ia);
652
653 if (eia == NULL) {
654 error = ifa_add_loopback_route((struct ifaddr *)ia,
655 (struct sockaddr *)&ia->ia_addr);
656 if (error)
657 goto fail2;
658 } else
659 ifa_free(&eia->ia_ifa);
660 }
661
662 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
663 struct in_addr allhosts_addr;
664 struct in_ifinfo *ii;
665
666 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
667 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
668
669 error = in_joingroup(ifp, &allhosts_addr, NULL,
670 &ii->ii_allhosts);
671 }
672
673 /*
674 * Note: we don't need extra reference for ifa, since we called
675 * with sx lock held, and ifaddr can not be deleted in concurrent
676 * thread.
677 */
678 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
679
680 return (error);
681
682 fail2:
683 if (vhid == 0)
684 (void )in_scrubprefix(ia, LLE_STATIC);
685
686 fail1:
687 if (ia->ia_ifa.ifa_carp)
688 (*carp_detach_p)(&ia->ia_ifa, false);
689
690 IF_ADDR_WLOCK(ifp);
691 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
692 IF_ADDR_WUNLOCK(ifp);
693 ifa_free(&ia->ia_ifa); /* if_addrhead */
694
695 sx_assert(&in_control_sx, SA_XLOCKED);
696 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
697 CK_LIST_REMOVE(ia, ia_hash);
698 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
699
700 return (error);
701 }
702
703 static int
in_difaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)704 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
705 {
706 const struct ifreq *ifr = (struct ifreq *)data;
707 const struct sockaddr_in *addr = (const struct sockaddr_in *)
708 &ifr->ifr_addr;
709 struct ifaddr *ifa;
710 struct in_ifaddr *ia;
711 bool deleteAny, iaIsLast;
712 int error;
713
714 if (cred != NULL) {
715 error = priv_check_cred(cred, PRIV_NET_DELIFADDR);
716 if (error)
717 return (error);
718 }
719
720 if (addr->sin_len != sizeof(struct sockaddr_in) ||
721 addr->sin_family != AF_INET)
722 deleteAny = true;
723 else
724 deleteAny = false;
725
726 iaIsLast = true;
727 ia = NULL;
728 IF_ADDR_WLOCK(ifp);
729 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
730 struct in_ifaddr *it;
731
732 if (ifa->ifa_addr->sa_family != AF_INET)
733 continue;
734
735 it = (struct in_ifaddr *)ifa;
736 if (deleteAny && ia == NULL && (cred == NULL ||
737 prison_check_ip4(cred, &it->ia_addr.sin_addr) == 0))
738 ia = it;
739
740 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
741 (cred == NULL || prison_check_ip4(cred,
742 &addr->sin_addr) == 0))
743 ia = it;
744
745 if (it != ia)
746 iaIsLast = false;
747 }
748
749 if (ia == NULL) {
750 IF_ADDR_WUNLOCK(ifp);
751 return (EADDRNOTAVAIL);
752 }
753
754 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
755 IF_ADDR_WUNLOCK(ifp);
756 ifa_free(&ia->ia_ifa); /* if_addrhead */
757
758 sx_assert(&in_control_sx, SA_XLOCKED);
759 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
760 CK_LIST_REMOVE(ia, ia_hash);
761
762 /*
763 * in_scrubprefix() kills the interface route.
764 */
765 in_scrubprefix(ia, LLE_STATIC);
766
767 /*
768 * in_ifadown gets rid of all the rest of
769 * the routes. This is not quite the right
770 * thing to do, but at least if we are running
771 * a routing process they will come back.
772 */
773 in_ifadown(&ia->ia_ifa, 1);
774
775 if (ia->ia_ifa.ifa_carp)
776 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
777
778 /*
779 * If this is the last IPv4 address configured on this
780 * interface, leave the all-hosts group.
781 * No state-change report need be transmitted.
782 */
783 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
784 struct in_ifinfo *ii;
785
786 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
787 if (ii->ii_allhosts) {
788 (void)in_leavegroup(ii->ii_allhosts, NULL);
789 ii->ii_allhosts = NULL;
790 }
791 }
792
793 IF_ADDR_WLOCK(ifp);
794 if (callout_stop(&ia->ia_garp_timer) == 1) {
795 ifa_free(&ia->ia_ifa);
796 }
797 IF_ADDR_WUNLOCK(ifp);
798
799 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
800 IFADDR_EVENT_DEL);
801 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
802
803 return (0);
804 }
805
806 static int
in_gifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)807 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
808 {
809 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
810 const struct sockaddr_in *addr = &ifra->ifra_addr;
811 struct epoch_tracker et;
812 struct ifaddr *ifa;
813 struct in_ifaddr *ia;
814
815 /*
816 * ifra_addr must be present and be of INET family.
817 */
818 if (addr->sin_len != sizeof(struct sockaddr_in) ||
819 addr->sin_family != AF_INET)
820 return (EINVAL);
821
822 /*
823 * See whether address exist.
824 */
825 ia = NULL;
826 NET_EPOCH_ENTER(et);
827 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
828 struct in_ifaddr *it;
829
830 if (ifa->ifa_addr->sa_family != AF_INET)
831 continue;
832
833 it = (struct in_ifaddr *)ifa;
834 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
835 prison_check_ip4(cred, &addr->sin_addr) == 0) {
836 ia = it;
837 break;
838 }
839 }
840 if (ia == NULL) {
841 NET_EPOCH_EXIT(et);
842 return (EADDRNOTAVAIL);
843 }
844
845 ifra->ifra_mask = ia->ia_sockmask;
846 if ((ifp->if_flags & IFF_POINTOPOINT) &&
847 ia->ia_dstaddr.sin_family == AF_INET)
848 ifra->ifra_dstaddr = ia->ia_dstaddr;
849 else if ((ifp->if_flags & IFF_BROADCAST) &&
850 ia->ia_broadaddr.sin_family == AF_INET)
851 ifra->ifra_broadaddr = ia->ia_broadaddr;
852 else
853 memset(&ifra->ifra_broadaddr, 0,
854 sizeof(ifra->ifra_broadaddr));
855
856 NET_EPOCH_EXIT(et);
857 return (0);
858 }
859
860 static int
in_match_ifaddr(const struct rtentry * rt,const struct nhop_object * nh,void * arg)861 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
862 {
863
864 if (nh->nh_ifa == (struct ifaddr *)arg)
865 return (1);
866
867 return (0);
868 }
869
870 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)871 in_handle_prefix_route(uint32_t fibnum, int cmd,
872 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa,
873 struct ifnet *ifp)
874 {
875
876 NET_EPOCH_ASSERT();
877
878 /* Prepare gateway */
879 struct sockaddr_dl_short sdl = {
880 .sdl_family = AF_LINK,
881 .sdl_len = sizeof(struct sockaddr_dl_short),
882 .sdl_type = ifa->ifa_ifp->if_type,
883 .sdl_index = ifa->ifa_ifp->if_index,
884 };
885
886 struct rt_addrinfo info = {
887 .rti_ifa = ifa,
888 .rti_ifp = ifp,
889 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
890 .rti_info = {
891 [RTAX_DST] = (struct sockaddr *)dst,
892 [RTAX_NETMASK] = (struct sockaddr *)netmask,
893 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
894 },
895 /* Ensure we delete the prefix IFF prefix ifa matches */
896 .rti_filter = in_match_ifaddr,
897 .rti_filterdata = ifa,
898 };
899
900 return (rib_handle_ifaddr_info(fibnum, cmd, &info));
901 }
902
903 /*
904 * Routing table interaction with interface addresses.
905 *
906 * In general, two types of routes needs to be installed:
907 * a) "interface" or "prefix" route, telling user that the addresses
908 * behind the ifa prefix are reached directly.
909 * b) "loopback" route installed for the ifa address, telling user that
910 * the address belongs to local system.
911 *
912 * Handling for (a) and (b) differs in multi-fib aspects, hence they
913 * are implemented in different functions below.
914 *
915 * The cases above may intersect - /32 interface aliases results in
916 * the same prefix produced by (a) and (b). This blurs the definition
917 * of the "loopback" route and complicate interactions. The interaction
918 * table is defined below. The case numbers are used in the multiple
919 * functions below to refer to the particular test case.
920 *
921 * There can be multiple options:
922 * 1) Adding address with prefix on non-p2p/non-loopback interface.
923 * Example: 192.0.2.1/24. Action:
924 * * add "prefix" route towards 192.0.2.0/24 via @ia interface,
925 * using @ia as an address source.
926 * * add "loopback" route towards 192.0.2.1 via V_loif, saving
927 * @ia ifp in the gateway and using @ia as an address source.
928 *
929 * 2) Adding address with /32 mask to non-p2p/non-loopback interface.
930 * Example: 192.0.2.2/32. Action:
931 * * add "prefix" host route via V_loif, using @ia as an address source.
932 *
933 * 3) Adding address with or without prefix to p2p interface.
934 * Example: 10.0.0.1/24->10.0.0.2. Action:
935 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia
936 * as an address source. Note: no sense in installing full /24 as the interface
937 * is point-to-point.
938 * * add "loopback" route towards 10.0.9.1 via V_loif, saving
939 * @ia ifp in the gateway and using @ia as an address source.
940 *
941 * 4) Adding address with or without prefix to loopback interface.
942 * Example: 192.0.2.1/24. Action:
943 * * add "prefix" host route via @ia interface, using @ia as an address source.
944 * Note: Skip installing /24 prefix as it would introduce TTL loop
945 * for the traffic destined to these addresses.
946 */
947
948 /*
949 * Checks if @ia needs to install loopback route to @ia address via
950 * ifa_maintain_loopback_route().
951 *
952 * Return true on success.
953 */
954 static bool
ia_need_loopback_route(const struct in_ifaddr * ia)955 ia_need_loopback_route(const struct in_ifaddr *ia)
956 {
957 struct ifnet *ifp = ia->ia_ifp;
958
959 /* Case 4: Skip loopback interfaces */
960 if ((ifp->if_flags & IFF_LOOPBACK) ||
961 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY))
962 return (false);
963
964 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */
965 if ((ifp->if_flags & IFF_POINTOPOINT) &&
966 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
967 return (false);
968
969 /* Case 2: skip /32 prefixes */
970 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
971 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST))
972 return (false);
973
974 return (true);
975 }
976
977 /*
978 * Calculate "prefix" route corresponding to @ia.
979 */
980 static void
ia_getrtprefix(const struct in_ifaddr * ia,struct in_addr * prefix,struct in_addr * mask)981 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask)
982 {
983
984 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) {
985 /* Case 3: return host route for dstaddr */
986 *prefix = ia->ia_dstaddr.sin_addr;
987 mask->s_addr = INADDR_BROADCAST;
988 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) {
989 /* Case 4: return host route for ifaddr */
990 *prefix = ia->ia_addr.sin_addr;
991 mask->s_addr = INADDR_BROADCAST;
992 } else {
993 /* Cases 1,2: return actual ia prefix */
994 *prefix = ia->ia_addr.sin_addr;
995 *mask = ia->ia_sockmask.sin_addr;
996 prefix->s_addr &= mask->s_addr;
997 }
998 }
999
1000 /*
1001 * Adds or delete interface "prefix" route corresponding to @ifa.
1002 * Returns 0 on success or errno.
1003 */
1004 static int
in_handle_ifaddr_route(int cmd,struct in_ifaddr * ia)1005 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia)
1006 {
1007 struct ifaddr *ifa = &ia->ia_ifa;
1008 struct in_addr daddr, maddr;
1009 struct sockaddr_in *pmask;
1010 struct epoch_tracker et;
1011 int error;
1012
1013 ia_getrtprefix(ia, &daddr, &maddr);
1014
1015 struct sockaddr_in mask = {
1016 .sin_family = AF_INET,
1017 .sin_len = sizeof(struct sockaddr_in),
1018 .sin_addr = maddr,
1019 };
1020
1021 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL;
1022
1023 struct sockaddr_in dst = {
1024 .sin_family = AF_INET,
1025 .sin_len = sizeof(struct sockaddr_in),
1026 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr,
1027 };
1028
1029 struct ifnet *ifp = ia->ia_ifp;
1030
1031 if ((maddr.s_addr == INADDR_BROADCAST) &&
1032 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) {
1033 /* Case 2: host route on broadcast interface */
1034 ifp = V_loif;
1035 }
1036
1037 uint32_t fibnum = ifa->ifa_ifp->if_fib;
1038 NET_EPOCH_ENTER(et);
1039 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp);
1040 NET_EPOCH_EXIT(et);
1041
1042 return (error);
1043 }
1044
1045 /*
1046 * Check if we have a route for the given prefix already.
1047 */
1048 static bool
in_hasrtprefix(struct in_ifaddr * target)1049 in_hasrtprefix(struct in_ifaddr *target)
1050 {
1051 struct epoch_tracker et;
1052 struct in_ifaddr *ia;
1053 struct in_addr prefix, mask, p, m;
1054 bool result = false;
1055
1056 ia_getrtprefix(target, &prefix, &mask);
1057
1058 /* Look for an existing address with the same prefix, mask, and fib */
1059 NET_EPOCH_ENTER(et);
1060 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1061 ia_getrtprefix(ia, &p, &m);
1062
1063 if (prefix.s_addr != p.s_addr ||
1064 mask.s_addr != m.s_addr)
1065 continue;
1066
1067 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
1068 continue;
1069
1070 /*
1071 * If we got a matching prefix route inserted by other
1072 * interface address, we are done here.
1073 */
1074 if (ia->ia_flags & IFA_ROUTE) {
1075 result = true;
1076 break;
1077 }
1078 }
1079 NET_EPOCH_EXIT(et);
1080
1081 return (result);
1082 }
1083
1084 int
in_addprefix(struct in_ifaddr * target)1085 in_addprefix(struct in_ifaddr *target)
1086 {
1087 int error;
1088
1089 if (in_hasrtprefix(target)) {
1090 if (V_nosameprefix)
1091 return (EEXIST);
1092 else {
1093 rt_addrmsg(RTM_ADD, &target->ia_ifa,
1094 target->ia_ifp->if_fib);
1095 return (0);
1096 }
1097 }
1098
1099 /*
1100 * No-one seem to have this prefix route, so we try to insert it.
1101 */
1102 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib);
1103 error = in_handle_ifaddr_route(RTM_ADD, target);
1104 if (!error)
1105 target->ia_flags |= IFA_ROUTE;
1106 return (error);
1107 }
1108
1109 /*
1110 * Removes either all lle entries for given @ia, or lle
1111 * corresponding to @ia address.
1112 */
1113 static void
in_scrubprefixlle(struct in_ifaddr * ia,int all,u_int flags)1114 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
1115 {
1116 struct sockaddr_in addr, mask;
1117 struct sockaddr *saddr, *smask;
1118 struct ifnet *ifp;
1119
1120 saddr = (struct sockaddr *)&addr;
1121 bzero(&addr, sizeof(addr));
1122 addr.sin_len = sizeof(addr);
1123 addr.sin_family = AF_INET;
1124 smask = (struct sockaddr *)&mask;
1125 bzero(&mask, sizeof(mask));
1126 mask.sin_len = sizeof(mask);
1127 mask.sin_family = AF_INET;
1128 mask.sin_addr.s_addr = ia->ia_subnetmask;
1129 ifp = ia->ia_ifp;
1130
1131 if (all) {
1132 /*
1133 * Remove all L2 entries matching given prefix.
1134 * Convert address to host representation to avoid
1135 * doing this on every callback. ia_subnetmask is already
1136 * stored in host representation.
1137 */
1138 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
1139 lltable_prefix_free(AF_INET, saddr, smask, flags);
1140 } else {
1141 /* Remove interface address only */
1142 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
1143 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
1144 }
1145 }
1146
1147 /*
1148 * If there is no other address in the system that can serve a route to the
1149 * same prefix, remove the route. Hand over the route to the new address
1150 * otherwise.
1151 */
1152 int
in_scrubprefix(struct in_ifaddr * target,u_int flags)1153 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1154 {
1155 struct epoch_tracker et;
1156 struct in_ifaddr *ia;
1157 struct in_addr prefix, mask, p, m;
1158 int error = 0;
1159
1160 /*
1161 * Remove the loopback route to the interface address.
1162 */
1163 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) {
1164 struct in_ifaddr *eia;
1165
1166 eia = in_localip_more(target);
1167
1168 if (eia != NULL) {
1169 error = ifa_switch_loopback_route((struct ifaddr *)eia,
1170 (struct sockaddr *)&target->ia_addr);
1171 ifa_free(&eia->ia_ifa);
1172 } else {
1173 error = ifa_del_loopback_route((struct ifaddr *)target,
1174 (struct sockaddr *)&target->ia_addr);
1175 }
1176 }
1177
1178 ia_getrtprefix(target, &prefix, &mask);
1179
1180 if ((target->ia_flags & IFA_ROUTE) == 0) {
1181 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1182
1183 /*
1184 * Removing address from !IFF_UP interface or
1185 * prefix which exists on other interface (along with route).
1186 * No entries should exist here except target addr.
1187 * Given that, delete this entry only.
1188 */
1189 in_scrubprefixlle(target, 0, flags);
1190 return (0);
1191 }
1192
1193 NET_EPOCH_ENTER(et);
1194 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1195 ia_getrtprefix(ia, &p, &m);
1196
1197 if (prefix.s_addr != p.s_addr ||
1198 mask.s_addr != m.s_addr)
1199 continue;
1200
1201 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1202 continue;
1203
1204 /*
1205 * If we got a matching prefix address, move IFA_ROUTE and
1206 * the route itself to it. Make sure that routing daemons
1207 * get a heads-up.
1208 */
1209 if ((ia->ia_flags & IFA_ROUTE) == 0) {
1210 ifa_ref(&ia->ia_ifa);
1211 NET_EPOCH_EXIT(et);
1212 error = in_handle_ifaddr_route(RTM_DELETE, target);
1213 if (error == 0)
1214 target->ia_flags &= ~IFA_ROUTE;
1215 else
1216 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1217 error);
1218 /* Scrub all entries IFF interface is different */
1219 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
1220 flags);
1221 error = in_handle_ifaddr_route(RTM_ADD, ia);
1222 if (error == 0)
1223 ia->ia_flags |= IFA_ROUTE;
1224 else
1225 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1226 error);
1227 ifa_free(&ia->ia_ifa);
1228 return (error);
1229 }
1230 }
1231 NET_EPOCH_EXIT(et);
1232
1233 /*
1234 * remove all L2 entries on the given prefix
1235 */
1236 in_scrubprefixlle(target, 1, flags);
1237
1238 /*
1239 * As no-one seem to have this prefix, we can remove the route.
1240 */
1241 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1242 error = in_handle_ifaddr_route(RTM_DELETE, target);
1243 if (error == 0)
1244 target->ia_flags &= ~IFA_ROUTE;
1245 else
1246 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1247 return (error);
1248 }
1249
1250 void
in_ifscrub_all(void)1251 in_ifscrub_all(void)
1252 {
1253 struct ifnet *ifp;
1254 struct ifaddr *ifa, *nifa;
1255 struct ifreq ifr;
1256
1257 IFNET_RLOCK();
1258 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1259 /* Cannot lock here - lock recursion. */
1260 /* NET_EPOCH_ENTER(et); */
1261 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1262 if (ifa->ifa_addr->sa_family != AF_INET)
1263 continue;
1264
1265 /*
1266 * This is ugly but the only way for legacy IP to
1267 * cleanly remove addresses and everything attached.
1268 */
1269 bzero(&ifr, sizeof(ifr));
1270 ifr.ifr_addr = *ifa->ifa_addr;
1271 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
1272 ifp, NULL);
1273 }
1274 /* NET_EPOCH_EXIT(et); */
1275 in_purgemaddrs(ifp);
1276 igmp_domifdetach(ifp);
1277 }
1278 IFNET_RUNLOCK();
1279 }
1280
1281 bool
in_ifaddr_broadcast(struct in_addr in,struct in_ifaddr * ia)1282 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
1283 {
1284
1285 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1286 /*
1287 * Optionally check for old-style (host 0) broadcast, but
1288 * taking into account that RFC 3021 obsoletes it.
1289 */
1290 __predict_false(V_broadcast_lowest &&
1291 ia->ia_subnetmask != IN_RFC3021_MASK &&
1292 ntohl(in.s_addr) == ia->ia_subnet)) &&
1293 /*
1294 * Check for an all one subnetmask. These
1295 * only exist when an interface gets a secondary
1296 * address.
1297 */
1298 ia->ia_subnetmask != (u_long)0xffffffff);
1299 }
1300
1301 /*
1302 * Return true if the address might be a local broadcast address.
1303 */
1304 bool
in_ifnet_broadcast(struct in_addr in,struct ifnet * ifp)1305 in_ifnet_broadcast(struct in_addr in, struct ifnet *ifp)
1306 {
1307 struct ifaddr *ifa;
1308
1309 NET_EPOCH_ASSERT();
1310
1311 if (in_broadcast(in))
1312 return (true);
1313 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1314 return (false);
1315 /*
1316 * Look through the list of addresses for a match
1317 * with a broadcast address.
1318 */
1319 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1320 if (ifa->ifa_addr->sa_family == AF_INET &&
1321 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa))
1322 return (true);
1323 return (false);
1324 }
1325
1326 /*
1327 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1328 */
1329 void
in_ifdetach(struct ifnet * ifp)1330 in_ifdetach(struct ifnet *ifp)
1331 {
1332 IN_MULTI_LOCK();
1333 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1334 in_pcbpurgeif0(&V_udbinfo, ifp);
1335 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1336 in_purgemaddrs(ifp);
1337 IN_MULTI_UNLOCK();
1338
1339 /*
1340 * Make sure all multicast deletions invoking if_ioctl() are
1341 * completed before returning. Else we risk accessing a freed
1342 * ifnet structure pointer.
1343 */
1344 inm_release_wait(NULL);
1345 }
1346
1347 static void
in_ifnet_event(void * arg __unused,struct ifnet * ifp,int event)1348 in_ifnet_event(void *arg __unused, struct ifnet *ifp, int event)
1349 {
1350 struct epoch_tracker et;
1351 struct ifaddr *ifa;
1352 struct in_ifaddr *ia;
1353 int error;
1354
1355 NET_EPOCH_ENTER(et);
1356 switch (event) {
1357 case IFNET_EVENT_DOWN:
1358 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1359 if (ifa->ifa_addr->sa_family != AF_INET)
1360 continue;
1361 ia = (struct in_ifaddr *)ifa;
1362 if ((ia->ia_flags & IFA_ROUTE) == 0)
1363 continue;
1364 ifa_ref(ifa);
1365 /*
1366 * in_scrubprefix() kills the interface route.
1367 */
1368 in_scrubprefix(ia, 0);
1369 /*
1370 * in_ifadown gets rid of all the rest of the
1371 * routes. This is not quite the right thing
1372 * to do, but at least if we are running a
1373 * routing process they will come back.
1374 */
1375 in_ifadown(ifa, 0);
1376 ifa_free(ifa);
1377 }
1378 break;
1379
1380 case IFNET_EVENT_UP:
1381 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1382 if (ifa->ifa_addr->sa_family != AF_INET)
1383 continue;
1384 ia = (struct in_ifaddr *)ifa;
1385 if (ia->ia_flags & IFA_ROUTE)
1386 continue;
1387 ifa_ref(ifa);
1388 error = ifa_del_loopback_route(ifa, ifa->ifa_addr);
1389 rt_addrmsg(RTM_ADD, ifa, ifa->ifa_ifp->if_fib);
1390 error = in_handle_ifaddr_route(RTM_ADD, ia);
1391 if (error == 0)
1392 ia->ia_flags |= IFA_ROUTE;
1393 error = ifa_add_loopback_route(ifa, ifa->ifa_addr);
1394 ifa_free(ifa);
1395 }
1396 break;
1397 }
1398 NET_EPOCH_EXIT(et);
1399 }
1400 EVENTHANDLER_DEFINE(ifnet_event, in_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
1401
1402 /*
1403 * Delete all IPv4 multicast address records, and associated link-layer
1404 * multicast address records, associated with ifp.
1405 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1406 * XXX This should not race with ifma_protospec being set during
1407 * a new allocation, if it does, we have bigger problems.
1408 */
1409 static void
in_purgemaddrs(struct ifnet * ifp)1410 in_purgemaddrs(struct ifnet *ifp)
1411 {
1412 struct epoch_tracker et;
1413 struct in_multi_head purgeinms;
1414 struct in_multi *inm;
1415 struct ifmultiaddr *ifma;
1416
1417 SLIST_INIT(&purgeinms);
1418 IN_MULTI_LIST_LOCK();
1419
1420 /*
1421 * Extract list of in_multi associated with the detaching ifp
1422 * which the PF_INET layer is about to release.
1423 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1424 * by code further down.
1425 */
1426 IF_ADDR_WLOCK(ifp);
1427 NET_EPOCH_ENTER(et);
1428 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1429 inm = inm_ifmultiaddr_get_inm(ifma);
1430 if (inm == NULL)
1431 continue;
1432 inm_rele_locked(&purgeinms, inm);
1433 }
1434 NET_EPOCH_EXIT(et);
1435 IF_ADDR_WUNLOCK(ifp);
1436
1437 inm_release_list_deferred(&purgeinms);
1438 igmp_ifdetach(ifp);
1439 IN_MULTI_LIST_UNLOCK();
1440 }
1441
1442 struct in_llentry {
1443 struct llentry base;
1444 };
1445
1446 #define IN_LLTBL_DEFAULT_HSIZE 32
1447 #define IN_LLTBL_HASH(k, h) \
1448 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1449
1450 /*
1451 * Do actual deallocation of @lle.
1452 */
1453 static void
in_lltable_destroy_lle_unlocked(epoch_context_t ctx)1454 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1455 {
1456 struct llentry *lle;
1457
1458 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1459 LLE_LOCK_DESTROY(lle);
1460 LLE_REQ_DESTROY(lle);
1461 free(lle, M_LLTABLE);
1462 }
1463
1464 /*
1465 * Called by LLE_FREE_LOCKED when number of references
1466 * drops to zero.
1467 */
1468 static void
in_lltable_destroy_lle(struct llentry * lle)1469 in_lltable_destroy_lle(struct llentry *lle)
1470 {
1471
1472 LLE_WUNLOCK(lle);
1473 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1474 }
1475
1476 static struct llentry *
in_lltable_new(struct in_addr addr4,u_int flags)1477 in_lltable_new(struct in_addr addr4, u_int flags)
1478 {
1479 struct in_llentry *lle;
1480
1481 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1482 if (lle == NULL) /* NB: caller generates msg */
1483 return NULL;
1484
1485 /*
1486 * For IPv4 this will trigger "arpresolve" to generate
1487 * an ARP request.
1488 */
1489 lle->base.la_expire = time_uptime; /* mark expired */
1490 lle->base.r_l3addr.addr4 = addr4;
1491 lle->base.lle_refcnt = 1;
1492 lle->base.lle_free = in_lltable_destroy_lle;
1493 LLE_LOCK_INIT(&lle->base);
1494 LLE_REQ_INIT(&lle->base);
1495 callout_init(&lle->base.lle_timer, 1);
1496
1497 return (&lle->base);
1498 }
1499
1500 static int
in_lltable_match_prefix(const struct sockaddr * saddr,const struct sockaddr * smask,u_int flags,struct llentry * lle)1501 in_lltable_match_prefix(const struct sockaddr *saddr,
1502 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1503 {
1504 struct in_addr addr, mask, lle_addr;
1505
1506 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1507 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1508 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1509
1510 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1511 return (0);
1512
1513 if (lle->la_flags & LLE_IFADDR) {
1514 /*
1515 * Delete LLE_IFADDR records IFF address & flag matches.
1516 * Note that addr is the interface address within prefix
1517 * being matched.
1518 * Note also we should handle 'ifdown' cases without removing
1519 * ifaddr macs.
1520 */
1521 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1522 return (1);
1523 return (0);
1524 }
1525
1526 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1527 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1528 return (1);
1529
1530 return (0);
1531 }
1532
1533 static void
in_lltable_free_entry(struct lltable * llt,struct llentry * lle)1534 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1535 {
1536 size_t pkts_dropped;
1537
1538 LLE_WLOCK_ASSERT(lle);
1539 KASSERT(llt != NULL, ("lltable is NULL"));
1540
1541 /* Unlink entry from table if not already */
1542 if ((lle->la_flags & LLE_LINKED) != 0) {
1543 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1544 lltable_unlink_entry(llt, lle);
1545 }
1546
1547 /* Drop hold queue */
1548 pkts_dropped = llentry_free(lle);
1549 ARPSTAT_ADD(dropped, pkts_dropped);
1550 }
1551
1552 static int
in_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)1553 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1554 {
1555 struct nhop_object *nh;
1556 struct in_addr addr;
1557
1558 KASSERT(l3addr->sa_family == AF_INET,
1559 ("sin_family %d", l3addr->sa_family));
1560
1561 addr = ((const struct sockaddr_in *)l3addr)->sin_addr;
1562
1563 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0);
1564 if (nh == NULL)
1565 return (EINVAL);
1566
1567 /*
1568 * If the gateway for an existing host route matches the target L3
1569 * address, which is a special route inserted by some implementation
1570 * such as MANET, and the interface is of the correct type, then
1571 * allow for ARP to proceed.
1572 */
1573 if (nh->nh_flags & NHF_GATEWAY) {
1574 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER ||
1575 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1576 memcmp(nh->gw_sa.sa_data, l3addr->sa_data,
1577 sizeof(in_addr_t)) != 0) {
1578 return (EINVAL);
1579 }
1580 }
1581
1582 /*
1583 * Make sure that at least the destination address is covered
1584 * by the route. This is for handling the case where 2 or more
1585 * interfaces have the same prefix. An incoming packet arrives
1586 * on one interface and the corresponding outgoing packet leaves
1587 * another interface.
1588 */
1589 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) {
1590 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp);
1591 struct in_addr dst_addr, mask_addr;
1592
1593 if (ia == NULL)
1594 return (EINVAL);
1595
1596 /*
1597 * ifaof_ifpforaddr() returns _best matching_ IFA.
1598 * It is possible that ifa prefix does not cover our address.
1599 * Explicitly verify and fail if that's the case.
1600 */
1601 dst_addr = IA_SIN(ia)->sin_addr;
1602 mask_addr.s_addr = htonl(ia->ia_subnetmask);
1603
1604 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr))
1605 return (EINVAL);
1606 }
1607
1608 return (0);
1609 }
1610
1611 static inline uint32_t
in_lltable_hash_dst(const struct in_addr dst,uint32_t hsize)1612 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1613 {
1614
1615 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1616 }
1617
1618 static uint32_t
in_lltable_hash(const struct llentry * lle,uint32_t hsize)1619 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1620 {
1621
1622 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1623 }
1624
1625 static void
in_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)1626 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1627 {
1628 struct sockaddr_in *sin;
1629
1630 sin = (struct sockaddr_in *)sa;
1631 bzero(sin, sizeof(*sin));
1632 sin->sin_family = AF_INET;
1633 sin->sin_len = sizeof(*sin);
1634 sin->sin_addr = lle->r_l3addr.addr4;
1635 }
1636
1637 static inline struct llentry *
in_lltable_find_dst(struct lltable * llt,struct in_addr dst)1638 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1639 {
1640 struct llentry *lle;
1641 struct llentries *lleh;
1642 u_int hashidx;
1643
1644 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1645 lleh = &llt->lle_head[hashidx];
1646 CK_LIST_FOREACH(lle, lleh, lle_next) {
1647 if (lle->la_flags & LLE_DELETED)
1648 continue;
1649 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1650 break;
1651 }
1652
1653 return (lle);
1654 }
1655
1656 static void
in_lltable_delete_entry(struct lltable * llt,struct llentry * lle)1657 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1658 {
1659
1660 lle->la_flags |= LLE_DELETED;
1661 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1662 #ifdef DIAGNOSTIC
1663 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1664 #endif
1665 llentry_free(lle);
1666 }
1667
1668 static struct llentry *
in_lltable_alloc(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1669 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1670 {
1671 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1672 struct ifnet *ifp = llt->llt_ifp;
1673 struct llentry *lle;
1674 char linkhdr[LLE_MAX_LINKHDR];
1675 size_t linkhdrsize;
1676 int lladdr_off;
1677
1678 KASSERT(l3addr->sa_family == AF_INET,
1679 ("sin_family %d", l3addr->sa_family));
1680
1681 /*
1682 * A route that covers the given address must have
1683 * been installed 1st because we are doing a resolution,
1684 * verify this.
1685 */
1686 if (!(flags & LLE_IFADDR) &&
1687 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1688 return (NULL);
1689
1690 lle = in_lltable_new(sin->sin_addr, flags);
1691 if (lle == NULL) {
1692 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1693 return (NULL);
1694 }
1695 lle->la_flags = flags;
1696 if (flags & LLE_STATIC)
1697 lle->r_flags |= RLLE_VALID;
1698 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1699 linkhdrsize = LLE_MAX_LINKHDR;
1700 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1701 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1702 in_lltable_free_entry(llt, lle);
1703 return (NULL);
1704 }
1705 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1706 lladdr_off);
1707 lle->la_flags |= LLE_STATIC;
1708 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1709 lle->la_expire = 0;
1710 }
1711
1712 return (lle);
1713 }
1714
1715 /*
1716 * Return NULL if not found or marked for deletion.
1717 * If found return lle read locked.
1718 */
1719 static struct llentry *
in_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1720 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1721 {
1722 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1723 struct llentry *lle;
1724
1725 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1726 KASSERT(l3addr->sa_family == AF_INET,
1727 ("sin_family %d", l3addr->sa_family));
1728 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1729 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1730 ("wrong lle request flags: %#x", flags));
1731
1732 lle = in_lltable_find_dst(llt, sin->sin_addr);
1733 if (lle == NULL)
1734 return (NULL);
1735 if (flags & LLE_UNLOCKED)
1736 return (lle);
1737
1738 if (flags & LLE_EXCLUSIVE)
1739 LLE_WLOCK(lle);
1740 else
1741 LLE_RLOCK(lle);
1742
1743 /*
1744 * If the afdata lock is not held, the LLE may have been unlinked while
1745 * we were blocked on the LLE lock. Check for this case.
1746 */
1747 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1748 if (flags & LLE_EXCLUSIVE)
1749 LLE_WUNLOCK(lle);
1750 else
1751 LLE_RUNLOCK(lle);
1752 return (NULL);
1753 }
1754 return (lle);
1755 }
1756
1757 static int
in_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct sysctl_req * wr)1758 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1759 struct sysctl_req *wr)
1760 {
1761 struct ifnet *ifp = llt->llt_ifp;
1762 /* XXX stack use */
1763 struct {
1764 struct rt_msghdr rtm;
1765 struct sockaddr_in sin;
1766 struct sockaddr_dl sdl;
1767 } arpc;
1768 struct sockaddr_dl *sdl;
1769 int error;
1770
1771 bzero(&arpc, sizeof(arpc));
1772 /* skip deleted entries */
1773 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1774 return (0);
1775 /* Skip if jailed and not a valid IP of the prison. */
1776 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1777 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1778 return (0);
1779 /*
1780 * produce a msg made of:
1781 * struct rt_msghdr;
1782 * struct sockaddr_in; (IPv4)
1783 * struct sockaddr_dl;
1784 */
1785 arpc.rtm.rtm_msglen = sizeof(arpc);
1786 arpc.rtm.rtm_version = RTM_VERSION;
1787 arpc.rtm.rtm_type = RTM_GET;
1788 arpc.rtm.rtm_flags = RTF_UP;
1789 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1790
1791 /* publish */
1792 if (lle->la_flags & LLE_PUB)
1793 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1794
1795 sdl = &arpc.sdl;
1796 sdl->sdl_family = AF_LINK;
1797 sdl->sdl_len = sizeof(*sdl);
1798 sdl->sdl_index = ifp->if_index;
1799 sdl->sdl_type = ifp->if_type;
1800 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1801 sdl->sdl_alen = ifp->if_addrlen;
1802 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1803 } else {
1804 sdl->sdl_alen = 0;
1805 bzero(LLADDR(sdl), ifp->if_addrlen);
1806 }
1807
1808 arpc.rtm.rtm_rmx.rmx_expire =
1809 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1810 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1811 if (lle->la_flags & LLE_STATIC)
1812 arpc.rtm.rtm_flags |= RTF_STATIC;
1813 if (lle->la_flags & LLE_IFADDR)
1814 arpc.rtm.rtm_flags |= RTF_PINNED;
1815 arpc.rtm.rtm_index = ifp->if_index;
1816 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1817
1818 return (error);
1819 }
1820
1821 static void
in_lltable_post_resolved(struct lltable * llt,struct llentry * lle)1822 in_lltable_post_resolved(struct lltable *llt, struct llentry *lle)
1823 {
1824 struct ifnet *ifp = llt->llt_ifp;
1825
1826 /* gratuitous ARP */
1827 if ((lle->la_flags & LLE_PUB) != 0)
1828 arprequest(ifp, &lle->r_l3addr.addr4, &lle->r_l3addr.addr4,
1829 lle->ll_addr);
1830 }
1831
1832 static struct lltable *
in_lltattach(struct ifnet * ifp)1833 in_lltattach(struct ifnet *ifp)
1834 {
1835 struct lltable *llt;
1836
1837 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1838 llt->llt_af = AF_INET;
1839 llt->llt_ifp = ifp;
1840
1841 llt->llt_lookup = in_lltable_lookup;
1842 llt->llt_alloc_entry = in_lltable_alloc;
1843 llt->llt_delete_entry = in_lltable_delete_entry;
1844 llt->llt_dump_entry = in_lltable_dump_entry;
1845 llt->llt_hash = in_lltable_hash;
1846 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1847 llt->llt_free_entry = in_lltable_free_entry;
1848 llt->llt_match_prefix = in_lltable_match_prefix;
1849 llt->llt_mark_used = llentry_mark_used;
1850 llt->llt_post_resolved = in_lltable_post_resolved;
1851 lltable_link(llt);
1852
1853 return (llt);
1854 }
1855
1856 struct lltable *
in_lltable_get(struct ifnet * ifp)1857 in_lltable_get(struct ifnet *ifp)
1858 {
1859 struct lltable *llt = NULL;
1860
1861 void *afdata_ptr = ifp->if_afdata[AF_INET];
1862 if (afdata_ptr != NULL)
1863 llt = ((struct in_ifinfo *)afdata_ptr)->ii_llt;
1864 return (llt);
1865 }
1866
1867 void *
in_domifattach(struct ifnet * ifp)1868 in_domifattach(struct ifnet *ifp)
1869 {
1870 struct in_ifinfo *ii;
1871
1872 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1873
1874 ii->ii_llt = in_lltattach(ifp);
1875 ii->ii_igmp = igmp_domifattach(ifp);
1876
1877 return (ii);
1878 }
1879
1880 void
in_domifdetach(struct ifnet * ifp,void * aux)1881 in_domifdetach(struct ifnet *ifp, void *aux)
1882 {
1883 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1884
1885 igmp_domifdetach(ifp);
1886 lltable_free(ii->ii_llt);
1887 free(ii, M_IFADDR);
1888 }
1889