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 1 if an internet address is for a ``local'' host
131 * (one to which we have a connection).
132 */
133 int
in_localaddr(struct in_addr in)134 in_localaddr(struct in_addr in)
135 {
136 u_long i = ntohl(in.s_addr);
137 struct in_ifaddr *ia;
138
139 NET_EPOCH_ASSERT();
140
141 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
142 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
143 return (1);
144 }
145
146 return (0);
147 }
148
149 /*
150 * Return 1 if an internet address is for the local host and configured
151 * on one of its interfaces.
152 */
153 bool
in_localip(struct in_addr in)154 in_localip(struct in_addr in)
155 {
156 struct in_ifaddr *ia;
157
158 NET_EPOCH_ASSERT();
159
160 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
161 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr)
162 return (true);
163
164 return (false);
165 }
166
167 /*
168 * Like in_localip(), but FIB-aware and carp(4)-aware.
169 */
170 bool
in_localip_fib(struct in_addr in,uint16_t fib)171 in_localip_fib(struct in_addr in, uint16_t fib)
172 {
173 struct in_ifaddr *ia;
174
175 NET_EPOCH_ASSERT();
176
177 CK_LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash)
178 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr &&
179 (ia->ia_ifa.ifa_carp == NULL ||
180 carp_master_p(&ia->ia_ifa)) &&
181 ia->ia_ifa.ifa_ifp->if_fib == fib)
182 return (true);
183
184 return (false);
185 }
186
187 /*
188 * Return 1 if an internet address is configured on an interface.
189 */
190 int
in_ifhasaddr(struct ifnet * ifp,struct in_addr in)191 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
192 {
193 struct ifaddr *ifa;
194 struct in_ifaddr *ia;
195
196 NET_EPOCH_ASSERT();
197
198 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
199 if (ifa->ifa_addr->sa_family != AF_INET)
200 continue;
201 ia = (struct in_ifaddr *)ifa;
202 if (ia->ia_addr.sin_addr.s_addr == in.s_addr)
203 return (1);
204 }
205
206 return (0);
207 }
208
209 /*
210 * Return a reference to the interface address which is different to
211 * the supplied one but with same IP address value.
212 */
213 static struct in_ifaddr *
in_localip_more(struct in_ifaddr * original_ia)214 in_localip_more(struct in_ifaddr *original_ia)
215 {
216 struct epoch_tracker et;
217 in_addr_t original_addr = IA_SIN(original_ia)->sin_addr.s_addr;
218 uint32_t original_fib = original_ia->ia_ifa.ifa_ifp->if_fib;
219 struct in_ifaddr *ia;
220
221 NET_EPOCH_ENTER(et);
222 CK_LIST_FOREACH(ia, INADDR_HASH(original_addr), ia_hash) {
223 in_addr_t addr = IA_SIN(ia)->sin_addr.s_addr;
224 uint32_t fib = ia->ia_ifa.ifa_ifp->if_fib;
225 if (!V_rt_add_addr_allfibs && (original_fib != fib))
226 continue;
227 if ((original_ia != ia) && (original_addr == addr)) {
228 ifa_ref(&ia->ia_ifa);
229 NET_EPOCH_EXIT(et);
230 return (ia);
231 }
232 }
233 NET_EPOCH_EXIT(et);
234
235 return (NULL);
236 }
237
238 /*
239 * Tries to find first IPv4 address in the provided fib.
240 * Prefers non-loopback addresses and return loopback IFF
241 * @loopback_ok is set.
242 *
243 * Returns ifa or NULL.
244 */
245 struct in_ifaddr *
in_findlocal(uint32_t fibnum,bool loopback_ok)246 in_findlocal(uint32_t fibnum, bool loopback_ok)
247 {
248 struct in_ifaddr *ia = NULL, *ia_lo = NULL;
249
250 NET_EPOCH_ASSERT();
251
252 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
253 uint32_t ia_fib = ia->ia_ifa.ifa_ifp->if_fib;
254 if (!V_rt_add_addr_allfibs && (fibnum != ia_fib))
255 continue;
256
257 if (!IN_LOOPBACK(ntohl(IA_SIN(ia)->sin_addr.s_addr)))
258 break;
259 if (loopback_ok)
260 ia_lo = ia;
261 }
262
263 if (ia == NULL)
264 ia = ia_lo;
265
266 return (ia);
267 }
268
269 /*
270 * Determine whether an IP address is in a reserved set of addresses
271 * that may not be forwarded, or whether datagrams to that destination
272 * may be forwarded.
273 */
274 int
in_canforward(struct in_addr in)275 in_canforward(struct in_addr in)
276 {
277 u_long i = ntohl(in.s_addr);
278
279 if (IN_MULTICAST(i) || IN_LINKLOCAL(i) || IN_LOOPBACK(i))
280 return (0);
281 if (IN_EXPERIMENTAL(i) && !V_ip_allow_net240)
282 return (0);
283 if (IN_ZERONET(i) && !V_ip_allow_net0)
284 return (0);
285 return (1);
286 }
287
288 /*
289 * Sysctl to manage prefix of reserved loopback network; translate
290 * to/from mask. The mask is always contiguous high-order 1 bits
291 * followed by all 0 bits.
292 */
293 static int
sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)294 sysctl_loopback_prefixlen(SYSCTL_HANDLER_ARGS)
295 {
296 int error, preflen;
297
298 /* ffs is 1-based; compensate. */
299 preflen = 33 - ffs(V_in_loopback_mask);
300 error = sysctl_handle_int(oidp, &preflen, 0, req);
301 if (error || !req->newptr)
302 return (error);
303 if (preflen < 8 || preflen > 31)
304 return (EINVAL);
305 V_in_loopback_mask = 0xffffffff << (32 - preflen);
306 return (0);
307 }
308
309 /*
310 * Trim a mask in a sockaddr
311 */
312 static void
in_socktrim(struct sockaddr_in * ap)313 in_socktrim(struct sockaddr_in *ap)
314 {
315 char *cplim = (char *) &ap->sin_addr;
316 char *cp = (char *) (&ap->sin_addr + 1);
317
318 ap->sin_len = 0;
319 while (--cp >= cplim)
320 if (*cp) {
321 (ap)->sin_len = cp - (char *) (ap) + 1;
322 break;
323 }
324 }
325
326 /*
327 * Generic internet control operations (ioctl's).
328 */
329 int
in_control_ioctl(u_long cmd,void * data,struct ifnet * ifp,struct ucred * cred)330 in_control_ioctl(u_long cmd, void *data, struct ifnet *ifp,
331 struct ucred *cred)
332 {
333 struct ifreq *ifr = (struct ifreq *)data;
334 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
335 struct epoch_tracker et;
336 struct ifaddr *ifa;
337 struct in_ifaddr *ia;
338 int error;
339
340 if (ifp == NULL)
341 return (EADDRNOTAVAIL);
342
343 /*
344 * Filter out 4 ioctls we implement directly. Forward the rest
345 * to specific functions and ifp->if_ioctl().
346 */
347 switch (cmd) {
348 case SIOCGIFADDR:
349 case SIOCGIFBRDADDR:
350 case SIOCGIFDSTADDR:
351 case SIOCGIFNETMASK:
352 break;
353 case SIOCGIFALIAS:
354 sx_xlock(&in_control_sx);
355 error = in_gifaddr_ioctl(cmd, data, ifp, cred);
356 sx_xunlock(&in_control_sx);
357 return (error);
358 case SIOCDIFADDR:
359 sx_xlock(&in_control_sx);
360 error = in_difaddr_ioctl(cmd, data, ifp, cred);
361 sx_xunlock(&in_control_sx);
362 return (error);
363 case OSIOCAIFADDR: /* 9.x compat */
364 case SIOCAIFADDR:
365 sx_xlock(&in_control_sx);
366 error = in_aifaddr_ioctl(cmd, data, ifp, cred);
367 sx_xunlock(&in_control_sx);
368 return (error);
369 case SIOCSIFADDR:
370 case SIOCSIFBRDADDR:
371 case SIOCSIFDSTADDR:
372 case SIOCSIFNETMASK:
373 /* We no longer support that old commands. */
374 return (EINVAL);
375 default:
376 if (ifp->if_ioctl == NULL)
377 return (EOPNOTSUPP);
378 return ((*ifp->if_ioctl)(ifp, cmd, data));
379 }
380
381 if (addr->sin_addr.s_addr != INADDR_ANY &&
382 prison_check_ip4(cred, &addr->sin_addr) != 0)
383 return (EADDRNOTAVAIL);
384
385 /*
386 * Find address for this interface, if it exists. If an
387 * address was specified, find that one instead of the
388 * first one on the interface, if possible.
389 */
390 NET_EPOCH_ENTER(et);
391 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
392 if (ifa->ifa_addr->sa_family != AF_INET)
393 continue;
394 ia = (struct in_ifaddr *)ifa;
395 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
396 break;
397 }
398 if (ifa == NULL)
399 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
400 if (ifa->ifa_addr->sa_family == AF_INET) {
401 ia = (struct in_ifaddr *)ifa;
402 if (prison_check_ip4(cred,
403 &ia->ia_addr.sin_addr) == 0)
404 break;
405 }
406
407 if (ifa == NULL) {
408 NET_EPOCH_EXIT(et);
409 return (EADDRNOTAVAIL);
410 }
411
412 error = 0;
413 switch (cmd) {
414 case SIOCGIFADDR:
415 *addr = ia->ia_addr;
416 break;
417
418 case SIOCGIFBRDADDR:
419 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
420 error = EINVAL;
421 break;
422 }
423 *addr = ia->ia_broadaddr;
424 break;
425
426 case SIOCGIFDSTADDR:
427 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
428 error = EINVAL;
429 break;
430 }
431 *addr = ia->ia_dstaddr;
432 break;
433
434 case SIOCGIFNETMASK:
435 *addr = ia->ia_sockmask;
436 break;
437 }
438
439 NET_EPOCH_EXIT(et);
440
441 return (error);
442 }
443
444 int
in_mask2len(struct in_addr * mask)445 in_mask2len(struct in_addr *mask)
446 {
447 int x, y;
448 u_char *p;
449
450 p = (u_char *)mask;
451 for (x = 0; x < sizeof(*mask); x++) {
452 if (p[x] != 0xff)
453 break;
454 }
455 y = 0;
456 if (x < sizeof(*mask)) {
457 for (y = 0; y < 8; y++) {
458 if ((p[x] & (0x80 >> y)) == 0)
459 break;
460 }
461 }
462 return (x * 8 + y);
463 }
464
465 int
in_control(struct socket * so,u_long cmd,void * data,struct ifnet * ifp,struct thread * td)466 in_control(struct socket *so, u_long cmd, void *data, struct ifnet *ifp,
467 struct thread *td)
468 {
469 return (in_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
470 }
471
472 static int
in_aifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)473 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
474 {
475 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
476 const struct sockaddr_in *addr = &ifra->ifra_addr;
477 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
478 const struct sockaddr_in *mask = &ifra->ifra_mask;
479 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
480 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
481 struct epoch_tracker et;
482 struct ifaddr *ifa;
483 struct in_ifaddr *ia;
484 bool iaIsFirst;
485 int error = 0;
486
487 error = priv_check_cred(cred, PRIV_NET_ADDIFADDR);
488 if (error)
489 return (error);
490
491 /*
492 * ifra_addr must be present and be of INET family.
493 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
494 */
495 if (addr->sin_len != sizeof(struct sockaddr_in) ||
496 addr->sin_family != AF_INET)
497 return (EINVAL);
498 if (broadaddr->sin_len != 0 &&
499 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
500 broadaddr->sin_family != AF_INET))
501 return (EINVAL);
502 if (mask->sin_len != 0 &&
503 (mask->sin_len != sizeof(struct sockaddr_in) ||
504 mask->sin_family != AF_INET))
505 return (EINVAL);
506 if ((ifp->if_flags & IFF_POINTOPOINT) &&
507 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
508 dstaddr->sin_addr.s_addr == INADDR_ANY))
509 return (EDESTADDRREQ);
510 if (vhid != 0 && carp_attach_p == NULL)
511 return (EPROTONOSUPPORT);
512
513 #ifdef MAC
514 /* Check if a MAC policy disallows setting the IPv4 address. */
515 error = mac_inet_check_add_addr(cred, &addr->sin_addr, ifp);
516 if (error != 0)
517 return (error);
518 #endif
519
520 /*
521 * See whether address already exist.
522 */
523 iaIsFirst = true;
524 ia = NULL;
525 NET_EPOCH_ENTER(et);
526 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
527 struct in_ifaddr *it;
528
529 if (ifa->ifa_addr->sa_family != AF_INET)
530 continue;
531
532 it = (struct in_ifaddr *)ifa;
533 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
534 prison_check_ip4(cred, &addr->sin_addr) == 0)
535 ia = it;
536 else
537 iaIsFirst = false;
538 }
539 NET_EPOCH_EXIT(et);
540
541 if (ia != NULL)
542 (void )in_difaddr_ioctl(cmd, data, ifp, cred);
543
544 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
545 ia = (struct in_ifaddr *)ifa;
546 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
547 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
548 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
549 callout_init_rw(&ia->ia_garp_timer, &ifp->if_addr_lock,
550 CALLOUT_RETURNUNLOCKED);
551
552 ia->ia_ifp = ifp;
553 ia->ia_addr = *addr;
554 if (mask->sin_len != 0) {
555 ia->ia_sockmask = *mask;
556 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
557 } else {
558 in_addr_t i = ntohl(addr->sin_addr.s_addr);
559
560 /*
561 * If netmask isn't supplied, use historical default.
562 * This is deprecated for interfaces other than loopback
563 * or point-to-point; warn in other cases. In the future
564 * we should return an error rather than warning.
565 */
566 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) == 0)
567 printf("%s: set address: WARNING: network mask "
568 "should be specified; using historical default\n",
569 ifp->if_xname);
570 if (IN_CLASSA(i))
571 ia->ia_subnetmask = IN_CLASSA_NET;
572 else if (IN_CLASSB(i))
573 ia->ia_subnetmask = IN_CLASSB_NET;
574 else
575 ia->ia_subnetmask = IN_CLASSC_NET;
576 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
577 }
578 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
579 in_socktrim(&ia->ia_sockmask);
580
581 if (ifp->if_flags & IFF_BROADCAST) {
582 if (broadaddr->sin_len != 0) {
583 ia->ia_broadaddr = *broadaddr;
584 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
585 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
586 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
587 ia->ia_broadaddr.sin_family = AF_INET;
588 } else {
589 ia->ia_broadaddr.sin_addr.s_addr =
590 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
591 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
592 ia->ia_broadaddr.sin_family = AF_INET;
593 }
594 }
595
596 if (ifp->if_flags & IFF_POINTOPOINT)
597 ia->ia_dstaddr = *dstaddr;
598
599 if (vhid != 0) {
600 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
601 if (error)
602 return (error);
603 }
604
605 /* if_addrhead is already referenced by ifa_alloc() */
606 IF_ADDR_WLOCK(ifp);
607 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
608 IF_ADDR_WUNLOCK(ifp);
609
610 ifa_ref(ifa); /* in_ifaddrhead */
611 sx_assert(&in_control_sx, SA_XLOCKED);
612 CK_STAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
613 CK_LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia,
614 ia_hash);
615
616 /*
617 * Give the interface a chance to initialize
618 * if this is its first address,
619 * and to validate the address if necessary.
620 */
621 if (ifp->if_ioctl != NULL) {
622 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
623 if (error)
624 goto fail1;
625 }
626
627 /*
628 * Add route for the network.
629 */
630 if (vhid == 0) {
631 error = in_addprefix(ia);
632 if (error)
633 goto fail1;
634 }
635
636 /*
637 * Add a loopback route to self.
638 */
639 if (vhid == 0 && ia_need_loopback_route(ia)) {
640 struct in_ifaddr *eia;
641
642 eia = in_localip_more(ia);
643
644 if (eia == NULL) {
645 error = ifa_add_loopback_route((struct ifaddr *)ia,
646 (struct sockaddr *)&ia->ia_addr);
647 if (error)
648 goto fail2;
649 } else
650 ifa_free(&eia->ia_ifa);
651 }
652
653 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
654 struct in_addr allhosts_addr;
655 struct in_ifinfo *ii;
656
657 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
658 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
659
660 error = in_joingroup(ifp, &allhosts_addr, NULL,
661 &ii->ii_allhosts);
662 }
663
664 /*
665 * Note: we don't need extra reference for ifa, since we called
666 * with sx lock held, and ifaddr can not be deleted in concurrent
667 * thread.
668 */
669 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, ifa, IFADDR_EVENT_ADD);
670
671 return (error);
672
673 fail2:
674 if (vhid == 0)
675 (void )in_scrubprefix(ia, LLE_STATIC);
676
677 fail1:
678 if (ia->ia_ifa.ifa_carp)
679 (*carp_detach_p)(&ia->ia_ifa, false);
680
681 IF_ADDR_WLOCK(ifp);
682 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
683 IF_ADDR_WUNLOCK(ifp);
684 ifa_free(&ia->ia_ifa); /* if_addrhead */
685
686 sx_assert(&in_control_sx, SA_XLOCKED);
687 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
688 CK_LIST_REMOVE(ia, ia_hash);
689 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
690
691 return (error);
692 }
693
694 static int
in_difaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)695 in_difaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
696 {
697 const struct ifreq *ifr = (struct ifreq *)data;
698 const struct sockaddr_in *addr = (const struct sockaddr_in *)
699 &ifr->ifr_addr;
700 struct ifaddr *ifa;
701 struct in_ifaddr *ia;
702 bool deleteAny, iaIsLast;
703 int error;
704
705 if (cred != NULL) {
706 error = priv_check_cred(cred, PRIV_NET_DELIFADDR);
707 if (error)
708 return (error);
709 }
710
711 if (addr->sin_len != sizeof(struct sockaddr_in) ||
712 addr->sin_family != AF_INET)
713 deleteAny = true;
714 else
715 deleteAny = false;
716
717 iaIsLast = true;
718 ia = NULL;
719 IF_ADDR_WLOCK(ifp);
720 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
721 struct in_ifaddr *it;
722
723 if (ifa->ifa_addr->sa_family != AF_INET)
724 continue;
725
726 it = (struct in_ifaddr *)ifa;
727 if (deleteAny && ia == NULL && (cred == NULL ||
728 prison_check_ip4(cred, &it->ia_addr.sin_addr) == 0))
729 ia = it;
730
731 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
732 (cred == NULL || prison_check_ip4(cred,
733 &addr->sin_addr) == 0))
734 ia = it;
735
736 if (it != ia)
737 iaIsLast = false;
738 }
739
740 if (ia == NULL) {
741 IF_ADDR_WUNLOCK(ifp);
742 return (EADDRNOTAVAIL);
743 }
744
745 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
746 IF_ADDR_WUNLOCK(ifp);
747 ifa_free(&ia->ia_ifa); /* if_addrhead */
748
749 sx_assert(&in_control_sx, SA_XLOCKED);
750 CK_STAILQ_REMOVE(&V_in_ifaddrhead, ia, in_ifaddr, ia_link);
751 CK_LIST_REMOVE(ia, ia_hash);
752
753 /*
754 * in_scrubprefix() kills the interface route.
755 */
756 in_scrubprefix(ia, LLE_STATIC);
757
758 /*
759 * in_ifadown gets rid of all the rest of
760 * the routes. This is not quite the right
761 * thing to do, but at least if we are running
762 * a routing process they will come back.
763 */
764 in_ifadown(&ia->ia_ifa, 1);
765
766 if (ia->ia_ifa.ifa_carp)
767 (*carp_detach_p)(&ia->ia_ifa, cmd == SIOCAIFADDR);
768
769 /*
770 * If this is the last IPv4 address configured on this
771 * interface, leave the all-hosts group.
772 * No state-change report need be transmitted.
773 */
774 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
775 struct in_ifinfo *ii;
776
777 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
778 if (ii->ii_allhosts) {
779 (void)in_leavegroup(ii->ii_allhosts, NULL);
780 ii->ii_allhosts = NULL;
781 }
782 }
783
784 IF_ADDR_WLOCK(ifp);
785 if (callout_stop(&ia->ia_garp_timer) == 1) {
786 ifa_free(&ia->ia_ifa);
787 }
788 IF_ADDR_WUNLOCK(ifp);
789
790 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
791 IFADDR_EVENT_DEL);
792 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
793
794 return (0);
795 }
796
797 static int
in_gifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct ucred * cred)798 in_gifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct ucred *cred)
799 {
800 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
801 const struct sockaddr_in *addr = &ifra->ifra_addr;
802 struct epoch_tracker et;
803 struct ifaddr *ifa;
804 struct in_ifaddr *ia;
805
806 /*
807 * ifra_addr must be present and be of INET family.
808 */
809 if (addr->sin_len != sizeof(struct sockaddr_in) ||
810 addr->sin_family != AF_INET)
811 return (EINVAL);
812
813 /*
814 * See whether address exist.
815 */
816 ia = NULL;
817 NET_EPOCH_ENTER(et);
818 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
819 struct in_ifaddr *it;
820
821 if (ifa->ifa_addr->sa_family != AF_INET)
822 continue;
823
824 it = (struct in_ifaddr *)ifa;
825 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
826 prison_check_ip4(cred, &addr->sin_addr) == 0) {
827 ia = it;
828 break;
829 }
830 }
831 if (ia == NULL) {
832 NET_EPOCH_EXIT(et);
833 return (EADDRNOTAVAIL);
834 }
835
836 ifra->ifra_mask = ia->ia_sockmask;
837 if ((ifp->if_flags & IFF_POINTOPOINT) &&
838 ia->ia_dstaddr.sin_family == AF_INET)
839 ifra->ifra_dstaddr = ia->ia_dstaddr;
840 else if ((ifp->if_flags & IFF_BROADCAST) &&
841 ia->ia_broadaddr.sin_family == AF_INET)
842 ifra->ifra_broadaddr = ia->ia_broadaddr;
843 else
844 memset(&ifra->ifra_broadaddr, 0,
845 sizeof(ifra->ifra_broadaddr));
846
847 NET_EPOCH_EXIT(et);
848 return (0);
849 }
850
851 static int
in_match_ifaddr(const struct rtentry * rt,const struct nhop_object * nh,void * arg)852 in_match_ifaddr(const struct rtentry *rt, const struct nhop_object *nh, void *arg)
853 {
854
855 if (nh->nh_ifa == (struct ifaddr *)arg)
856 return (1);
857
858 return (0);
859 }
860
861 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)862 in_handle_prefix_route(uint32_t fibnum, int cmd,
863 struct sockaddr_in *dst, struct sockaddr_in *netmask, struct ifaddr *ifa,
864 struct ifnet *ifp)
865 {
866
867 NET_EPOCH_ASSERT();
868
869 /* Prepare gateway */
870 struct sockaddr_dl_short sdl = {
871 .sdl_family = AF_LINK,
872 .sdl_len = sizeof(struct sockaddr_dl_short),
873 .sdl_type = ifa->ifa_ifp->if_type,
874 .sdl_index = ifa->ifa_ifp->if_index,
875 };
876
877 struct rt_addrinfo info = {
878 .rti_ifa = ifa,
879 .rti_ifp = ifp,
880 .rti_flags = RTF_PINNED | ((netmask != NULL) ? 0 : RTF_HOST),
881 .rti_info = {
882 [RTAX_DST] = (struct sockaddr *)dst,
883 [RTAX_NETMASK] = (struct sockaddr *)netmask,
884 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
885 },
886 /* Ensure we delete the prefix IFF prefix ifa matches */
887 .rti_filter = in_match_ifaddr,
888 .rti_filterdata = ifa,
889 };
890
891 return (rib_handle_ifaddr_info(fibnum, cmd, &info));
892 }
893
894 /*
895 * Routing table interaction with interface addresses.
896 *
897 * In general, two types of routes needs to be installed:
898 * a) "interface" or "prefix" route, telling user that the addresses
899 * behind the ifa prefix are reached directly.
900 * b) "loopback" route installed for the ifa address, telling user that
901 * the address belongs to local system.
902 *
903 * Handling for (a) and (b) differs in multi-fib aspects, hence they
904 * are implemented in different functions below.
905 *
906 * The cases above may intersect - /32 interface aliases results in
907 * the same prefix produced by (a) and (b). This blurs the definition
908 * of the "loopback" route and complicate interactions. The interaction
909 * table is defined below. The case numbers are used in the multiple
910 * functions below to refer to the particular test case.
911 *
912 * There can be multiple options:
913 * 1) Adding address with prefix on non-p2p/non-loopback interface.
914 * Example: 192.0.2.1/24. Action:
915 * * add "prefix" route towards 192.0.2.0/24 via @ia interface,
916 * using @ia as an address source.
917 * * add "loopback" route towards 192.0.2.1 via V_loif, saving
918 * @ia ifp in the gateway and using @ia as an address source.
919 *
920 * 2) Adding address with /32 mask to non-p2p/non-loopback interface.
921 * Example: 192.0.2.2/32. Action:
922 * * add "prefix" host route via V_loif, using @ia as an address source.
923 *
924 * 3) Adding address with or without prefix to p2p interface.
925 * Example: 10.0.0.1/24->10.0.0.2. Action:
926 * * add "prefix" host route towards 10.0.0.2 via this interface, using @ia
927 * as an address source. Note: no sense in installing full /24 as the interface
928 * is point-to-point.
929 * * add "loopback" route towards 10.0.9.1 via V_loif, saving
930 * @ia ifp in the gateway and using @ia as an address source.
931 *
932 * 4) Adding address with or without prefix to loopback interface.
933 * Example: 192.0.2.1/24. Action:
934 * * add "prefix" host route via @ia interface, using @ia as an address source.
935 * Note: Skip installing /24 prefix as it would introduce TTL loop
936 * for the traffic destined to these addresses.
937 */
938
939 /*
940 * Checks if @ia needs to install loopback route to @ia address via
941 * ifa_maintain_loopback_route().
942 *
943 * Return true on success.
944 */
945 static bool
ia_need_loopback_route(const struct in_ifaddr * ia)946 ia_need_loopback_route(const struct in_ifaddr *ia)
947 {
948 struct ifnet *ifp = ia->ia_ifp;
949
950 /* Case 4: Skip loopback interfaces */
951 if ((ifp->if_flags & IFF_LOOPBACK) ||
952 (ia->ia_addr.sin_addr.s_addr == INADDR_ANY))
953 return (false);
954
955 /* Clash avoidance: Skip p2p interfaces with both addresses are equal */
956 if ((ifp->if_flags & IFF_POINTOPOINT) &&
957 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
958 return (false);
959
960 /* Case 2: skip /32 prefixes */
961 if (!(ifp->if_flags & IFF_POINTOPOINT) &&
962 (ia->ia_sockmask.sin_addr.s_addr == INADDR_BROADCAST))
963 return (false);
964
965 return (true);
966 }
967
968 /*
969 * Calculate "prefix" route corresponding to @ia.
970 */
971 static void
ia_getrtprefix(const struct in_ifaddr * ia,struct in_addr * prefix,struct in_addr * mask)972 ia_getrtprefix(const struct in_ifaddr *ia, struct in_addr *prefix, struct in_addr *mask)
973 {
974
975 if (ia->ia_ifp->if_flags & IFF_POINTOPOINT) {
976 /* Case 3: return host route for dstaddr */
977 *prefix = ia->ia_dstaddr.sin_addr;
978 mask->s_addr = INADDR_BROADCAST;
979 } else if (ia->ia_ifp->if_flags & IFF_LOOPBACK) {
980 /* Case 4: return host route for ifaddr */
981 *prefix = ia->ia_addr.sin_addr;
982 mask->s_addr = INADDR_BROADCAST;
983 } else {
984 /* Cases 1,2: return actual ia prefix */
985 *prefix = ia->ia_addr.sin_addr;
986 *mask = ia->ia_sockmask.sin_addr;
987 prefix->s_addr &= mask->s_addr;
988 }
989 }
990
991 /*
992 * Adds or delete interface "prefix" route corresponding to @ifa.
993 * Returns 0 on success or errno.
994 */
995 static int
in_handle_ifaddr_route(int cmd,struct in_ifaddr * ia)996 in_handle_ifaddr_route(int cmd, struct in_ifaddr *ia)
997 {
998 struct ifaddr *ifa = &ia->ia_ifa;
999 struct in_addr daddr, maddr;
1000 struct sockaddr_in *pmask;
1001 struct epoch_tracker et;
1002 int error;
1003
1004 ia_getrtprefix(ia, &daddr, &maddr);
1005
1006 struct sockaddr_in mask = {
1007 .sin_family = AF_INET,
1008 .sin_len = sizeof(struct sockaddr_in),
1009 .sin_addr = maddr,
1010 };
1011
1012 pmask = (maddr.s_addr != INADDR_BROADCAST) ? &mask : NULL;
1013
1014 struct sockaddr_in dst = {
1015 .sin_family = AF_INET,
1016 .sin_len = sizeof(struct sockaddr_in),
1017 .sin_addr.s_addr = daddr.s_addr & maddr.s_addr,
1018 };
1019
1020 struct ifnet *ifp = ia->ia_ifp;
1021
1022 if ((maddr.s_addr == INADDR_BROADCAST) &&
1023 (!(ia->ia_ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)))) {
1024 /* Case 2: host route on broadcast interface */
1025 ifp = V_loif;
1026 }
1027
1028 uint32_t fibnum = ifa->ifa_ifp->if_fib;
1029 NET_EPOCH_ENTER(et);
1030 error = in_handle_prefix_route(fibnum, cmd, &dst, pmask, ifa, ifp);
1031 NET_EPOCH_EXIT(et);
1032
1033 return (error);
1034 }
1035
1036 /*
1037 * Check if we have a route for the given prefix already.
1038 */
1039 static bool
in_hasrtprefix(struct in_ifaddr * target)1040 in_hasrtprefix(struct in_ifaddr *target)
1041 {
1042 struct epoch_tracker et;
1043 struct in_ifaddr *ia;
1044 struct in_addr prefix, mask, p, m;
1045 bool result = false;
1046
1047 ia_getrtprefix(target, &prefix, &mask);
1048
1049 /* Look for an existing address with the same prefix, mask, and fib */
1050 NET_EPOCH_ENTER(et);
1051 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1052 ia_getrtprefix(ia, &p, &m);
1053
1054 if (prefix.s_addr != p.s_addr ||
1055 mask.s_addr != m.s_addr)
1056 continue;
1057
1058 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
1059 continue;
1060
1061 /*
1062 * If we got a matching prefix route inserted by other
1063 * interface address, we are done here.
1064 */
1065 if (ia->ia_flags & IFA_ROUTE) {
1066 result = true;
1067 break;
1068 }
1069 }
1070 NET_EPOCH_EXIT(et);
1071
1072 return (result);
1073 }
1074
1075 int
in_addprefix(struct in_ifaddr * target)1076 in_addprefix(struct in_ifaddr *target)
1077 {
1078 int error;
1079
1080 if (in_hasrtprefix(target)) {
1081 if (V_nosameprefix)
1082 return (EEXIST);
1083 else {
1084 rt_addrmsg(RTM_ADD, &target->ia_ifa,
1085 target->ia_ifp->if_fib);
1086 return (0);
1087 }
1088 }
1089
1090 /*
1091 * No-one seem to have this prefix route, so we try to insert it.
1092 */
1093 rt_addrmsg(RTM_ADD, &target->ia_ifa, target->ia_ifp->if_fib);
1094 error = in_handle_ifaddr_route(RTM_ADD, target);
1095 if (!error)
1096 target->ia_flags |= IFA_ROUTE;
1097 return (error);
1098 }
1099
1100 /*
1101 * Removes either all lle entries for given @ia, or lle
1102 * corresponding to @ia address.
1103 */
1104 static void
in_scrubprefixlle(struct in_ifaddr * ia,int all,u_int flags)1105 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
1106 {
1107 struct sockaddr_in addr, mask;
1108 struct sockaddr *saddr, *smask;
1109 struct ifnet *ifp;
1110
1111 saddr = (struct sockaddr *)&addr;
1112 bzero(&addr, sizeof(addr));
1113 addr.sin_len = sizeof(addr);
1114 addr.sin_family = AF_INET;
1115 smask = (struct sockaddr *)&mask;
1116 bzero(&mask, sizeof(mask));
1117 mask.sin_len = sizeof(mask);
1118 mask.sin_family = AF_INET;
1119 mask.sin_addr.s_addr = ia->ia_subnetmask;
1120 ifp = ia->ia_ifp;
1121
1122 if (all) {
1123 /*
1124 * Remove all L2 entries matching given prefix.
1125 * Convert address to host representation to avoid
1126 * doing this on every callback. ia_subnetmask is already
1127 * stored in host representation.
1128 */
1129 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
1130 lltable_prefix_free(AF_INET, saddr, smask, flags);
1131 } else {
1132 /* Remove interface address only */
1133 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
1134 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
1135 }
1136 }
1137
1138 /*
1139 * If there is no other address in the system that can serve a route to the
1140 * same prefix, remove the route. Hand over the route to the new address
1141 * otherwise.
1142 */
1143 int
in_scrubprefix(struct in_ifaddr * target,u_int flags)1144 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1145 {
1146 struct epoch_tracker et;
1147 struct in_ifaddr *ia;
1148 struct in_addr prefix, mask, p, m;
1149 int error = 0;
1150
1151 /*
1152 * Remove the loopback route to the interface address.
1153 */
1154 if (ia_need_loopback_route(target) && (flags & LLE_STATIC)) {
1155 struct in_ifaddr *eia;
1156
1157 eia = in_localip_more(target);
1158
1159 if (eia != NULL) {
1160 error = ifa_switch_loopback_route((struct ifaddr *)eia,
1161 (struct sockaddr *)&target->ia_addr);
1162 ifa_free(&eia->ia_ifa);
1163 } else {
1164 error = ifa_del_loopback_route((struct ifaddr *)target,
1165 (struct sockaddr *)&target->ia_addr);
1166 }
1167 }
1168
1169 ia_getrtprefix(target, &prefix, &mask);
1170
1171 if ((target->ia_flags & IFA_ROUTE) == 0) {
1172 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1173
1174 /*
1175 * Removing address from !IFF_UP interface or
1176 * prefix which exists on other interface (along with route).
1177 * No entries should exist here except target addr.
1178 * Given that, delete this entry only.
1179 */
1180 in_scrubprefixlle(target, 0, flags);
1181 return (0);
1182 }
1183
1184 NET_EPOCH_ENTER(et);
1185 CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1186 ia_getrtprefix(ia, &p, &m);
1187
1188 if (prefix.s_addr != p.s_addr ||
1189 mask.s_addr != m.s_addr)
1190 continue;
1191
1192 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
1193 continue;
1194
1195 /*
1196 * If we got a matching prefix address, move IFA_ROUTE and
1197 * the route itself to it. Make sure that routing daemons
1198 * get a heads-up.
1199 */
1200 if ((ia->ia_flags & IFA_ROUTE) == 0) {
1201 ifa_ref(&ia->ia_ifa);
1202 NET_EPOCH_EXIT(et);
1203 error = in_handle_ifaddr_route(RTM_DELETE, target);
1204 if (error == 0)
1205 target->ia_flags &= ~IFA_ROUTE;
1206 else
1207 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1208 error);
1209 /* Scrub all entries IFF interface is different */
1210 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
1211 flags);
1212 error = in_handle_ifaddr_route(RTM_ADD, ia);
1213 if (error == 0)
1214 ia->ia_flags |= IFA_ROUTE;
1215 else
1216 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1217 error);
1218 ifa_free(&ia->ia_ifa);
1219 return (error);
1220 }
1221 }
1222 NET_EPOCH_EXIT(et);
1223
1224 /*
1225 * remove all L2 entries on the given prefix
1226 */
1227 in_scrubprefixlle(target, 1, flags);
1228
1229 /*
1230 * As no-one seem to have this prefix, we can remove the route.
1231 */
1232 rt_addrmsg(RTM_DELETE, &target->ia_ifa, target->ia_ifp->if_fib);
1233 error = in_handle_ifaddr_route(RTM_DELETE, target);
1234 if (error == 0)
1235 target->ia_flags &= ~IFA_ROUTE;
1236 else
1237 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1238 return (error);
1239 }
1240
1241 void
in_ifscrub_all(void)1242 in_ifscrub_all(void)
1243 {
1244 struct ifnet *ifp;
1245 struct ifaddr *ifa, *nifa;
1246 struct ifreq ifr;
1247
1248 IFNET_RLOCK();
1249 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
1250 /* Cannot lock here - lock recursion. */
1251 /* NET_EPOCH_ENTER(et); */
1252 CK_STAILQ_FOREACH_SAFE(ifa, &ifp->if_addrhead, ifa_link, nifa) {
1253 if (ifa->ifa_addr->sa_family != AF_INET)
1254 continue;
1255
1256 /*
1257 * This is ugly but the only way for legacy IP to
1258 * cleanly remove addresses and everything attached.
1259 */
1260 bzero(&ifr, sizeof(ifr));
1261 ifr.ifr_addr = *ifa->ifa_addr;
1262 (void)in_control(NULL, SIOCDIFADDR, (caddr_t)&ifr,
1263 ifp, NULL);
1264 }
1265 /* NET_EPOCH_EXIT(et); */
1266 in_purgemaddrs(ifp);
1267 igmp_domifdetach(ifp);
1268 }
1269 IFNET_RUNLOCK();
1270 }
1271
1272 int
in_ifaddr_broadcast(struct in_addr in,struct in_ifaddr * ia)1273 in_ifaddr_broadcast(struct in_addr in, struct in_ifaddr *ia)
1274 {
1275
1276 return ((in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1277 /*
1278 * Optionally check for old-style (host 0) broadcast, but
1279 * taking into account that RFC 3021 obsoletes it.
1280 */
1281 (V_broadcast_lowest && ia->ia_subnetmask != IN_RFC3021_MASK &&
1282 ntohl(in.s_addr) == ia->ia_subnet)) &&
1283 /*
1284 * Check for an all one subnetmask. These
1285 * only exist when an interface gets a secondary
1286 * address.
1287 */
1288 ia->ia_subnetmask != (u_long)0xffffffff);
1289 }
1290
1291 /*
1292 * Return 1 if the address might be a local broadcast address.
1293 */
1294 int
in_broadcast(struct in_addr in,struct ifnet * ifp)1295 in_broadcast(struct in_addr in, struct ifnet *ifp)
1296 {
1297 struct ifaddr *ifa;
1298 int found;
1299
1300 NET_EPOCH_ASSERT();
1301
1302 if (in.s_addr == INADDR_BROADCAST ||
1303 in.s_addr == INADDR_ANY)
1304 return (1);
1305 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1306 return (0);
1307 found = 0;
1308 /*
1309 * Look through the list of addresses for a match
1310 * with a broadcast address.
1311 */
1312 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1313 if (ifa->ifa_addr->sa_family == AF_INET &&
1314 in_ifaddr_broadcast(in, (struct in_ifaddr *)ifa)) {
1315 found = 1;
1316 break;
1317 }
1318 return (found);
1319 }
1320
1321 /*
1322 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1323 */
1324 void
in_ifdetach(struct ifnet * ifp)1325 in_ifdetach(struct ifnet *ifp)
1326 {
1327 IN_MULTI_LOCK();
1328 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1329 in_pcbpurgeif0(&V_udbinfo, ifp);
1330 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
1331 in_purgemaddrs(ifp);
1332 IN_MULTI_UNLOCK();
1333
1334 /*
1335 * Make sure all multicast deletions invoking if_ioctl() are
1336 * completed before returning. Else we risk accessing a freed
1337 * ifnet structure pointer.
1338 */
1339 inm_release_wait(NULL);
1340 }
1341
1342 static void
in_ifnet_event(void * arg __unused,struct ifnet * ifp,int event)1343 in_ifnet_event(void *arg __unused, struct ifnet *ifp, int event)
1344 {
1345 struct epoch_tracker et;
1346 struct ifaddr *ifa;
1347 struct in_ifaddr *ia;
1348 int error;
1349
1350 NET_EPOCH_ENTER(et);
1351 switch (event) {
1352 case IFNET_EVENT_DOWN:
1353 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1354 if (ifa->ifa_addr->sa_family != AF_INET)
1355 continue;
1356 ia = (struct in_ifaddr *)ifa;
1357 if ((ia->ia_flags & IFA_ROUTE) == 0)
1358 continue;
1359 ifa_ref(ifa);
1360 /*
1361 * in_scrubprefix() kills the interface route.
1362 */
1363 in_scrubprefix(ia, 0);
1364 /*
1365 * in_ifadown gets rid of all the rest of the
1366 * routes. This is not quite the right thing
1367 * to do, but at least if we are running a
1368 * routing process they will come back.
1369 */
1370 in_ifadown(ifa, 0);
1371 ifa_free(ifa);
1372 }
1373 break;
1374
1375 case IFNET_EVENT_UP:
1376 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1377 if (ifa->ifa_addr->sa_family != AF_INET)
1378 continue;
1379 ia = (struct in_ifaddr *)ifa;
1380 if (ia->ia_flags & IFA_ROUTE)
1381 continue;
1382 ifa_ref(ifa);
1383 error = ifa_del_loopback_route(ifa, ifa->ifa_addr);
1384 rt_addrmsg(RTM_ADD, ifa, ifa->ifa_ifp->if_fib);
1385 error = in_handle_ifaddr_route(RTM_ADD, ia);
1386 if (error == 0)
1387 ia->ia_flags |= IFA_ROUTE;
1388 error = ifa_add_loopback_route(ifa, ifa->ifa_addr);
1389 ifa_free(ifa);
1390 }
1391 break;
1392 }
1393 NET_EPOCH_EXIT(et);
1394 }
1395 EVENTHANDLER_DEFINE(ifnet_event, in_ifnet_event, NULL, EVENTHANDLER_PRI_ANY);
1396
1397 /*
1398 * Delete all IPv4 multicast address records, and associated link-layer
1399 * multicast address records, associated with ifp.
1400 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1401 * XXX This should not race with ifma_protospec being set during
1402 * a new allocation, if it does, we have bigger problems.
1403 */
1404 static void
in_purgemaddrs(struct ifnet * ifp)1405 in_purgemaddrs(struct ifnet *ifp)
1406 {
1407 struct epoch_tracker et;
1408 struct in_multi_head purgeinms;
1409 struct in_multi *inm;
1410 struct ifmultiaddr *ifma;
1411
1412 SLIST_INIT(&purgeinms);
1413 IN_MULTI_LIST_LOCK();
1414
1415 /*
1416 * Extract list of in_multi associated with the detaching ifp
1417 * which the PF_INET layer is about to release.
1418 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1419 * by code further down.
1420 */
1421 IF_ADDR_WLOCK(ifp);
1422 NET_EPOCH_ENTER(et);
1423 CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1424 inm = inm_ifmultiaddr_get_inm(ifma);
1425 if (inm == NULL)
1426 continue;
1427 inm_rele_locked(&purgeinms, inm);
1428 }
1429 NET_EPOCH_EXIT(et);
1430 IF_ADDR_WUNLOCK(ifp);
1431
1432 inm_release_list_deferred(&purgeinms);
1433 igmp_ifdetach(ifp);
1434 IN_MULTI_LIST_UNLOCK();
1435 }
1436
1437 struct in_llentry {
1438 struct llentry base;
1439 };
1440
1441 #define IN_LLTBL_DEFAULT_HSIZE 32
1442 #define IN_LLTBL_HASH(k, h) \
1443 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1444
1445 /*
1446 * Do actual deallocation of @lle.
1447 */
1448 static void
in_lltable_destroy_lle_unlocked(epoch_context_t ctx)1449 in_lltable_destroy_lle_unlocked(epoch_context_t ctx)
1450 {
1451 struct llentry *lle;
1452
1453 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
1454 LLE_LOCK_DESTROY(lle);
1455 LLE_REQ_DESTROY(lle);
1456 free(lle, M_LLTABLE);
1457 }
1458
1459 /*
1460 * Called by LLE_FREE_LOCKED when number of references
1461 * drops to zero.
1462 */
1463 static void
in_lltable_destroy_lle(struct llentry * lle)1464 in_lltable_destroy_lle(struct llentry *lle)
1465 {
1466
1467 LLE_WUNLOCK(lle);
1468 NET_EPOCH_CALL(in_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
1469 }
1470
1471 static struct llentry *
in_lltable_new(struct in_addr addr4,u_int flags)1472 in_lltable_new(struct in_addr addr4, u_int flags)
1473 {
1474 struct in_llentry *lle;
1475
1476 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1477 if (lle == NULL) /* NB: caller generates msg */
1478 return NULL;
1479
1480 /*
1481 * For IPv4 this will trigger "arpresolve" to generate
1482 * an ARP request.
1483 */
1484 lle->base.la_expire = time_uptime; /* mark expired */
1485 lle->base.r_l3addr.addr4 = addr4;
1486 lle->base.lle_refcnt = 1;
1487 lle->base.lle_free = in_lltable_destroy_lle;
1488 LLE_LOCK_INIT(&lle->base);
1489 LLE_REQ_INIT(&lle->base);
1490 callout_init(&lle->base.lle_timer, 1);
1491
1492 return (&lle->base);
1493 }
1494
1495 static int
in_lltable_match_prefix(const struct sockaddr * saddr,const struct sockaddr * smask,u_int flags,struct llentry * lle)1496 in_lltable_match_prefix(const struct sockaddr *saddr,
1497 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1498 {
1499 struct in_addr addr, mask, lle_addr;
1500
1501 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1502 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1503 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1504
1505 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1506 return (0);
1507
1508 if (lle->la_flags & LLE_IFADDR) {
1509 /*
1510 * Delete LLE_IFADDR records IFF address & flag matches.
1511 * Note that addr is the interface address within prefix
1512 * being matched.
1513 * Note also we should handle 'ifdown' cases without removing
1514 * ifaddr macs.
1515 */
1516 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1517 return (1);
1518 return (0);
1519 }
1520
1521 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1522 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1523 return (1);
1524
1525 return (0);
1526 }
1527
1528 static void
in_lltable_free_entry(struct lltable * llt,struct llentry * lle)1529 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1530 {
1531 size_t pkts_dropped;
1532
1533 LLE_WLOCK_ASSERT(lle);
1534 KASSERT(llt != NULL, ("lltable is NULL"));
1535
1536 /* Unlink entry from table if not already */
1537 if ((lle->la_flags & LLE_LINKED) != 0) {
1538 IF_AFDATA_WLOCK_ASSERT(llt->llt_ifp);
1539 lltable_unlink_entry(llt, lle);
1540 }
1541
1542 /* Drop hold queue */
1543 pkts_dropped = llentry_free(lle);
1544 ARPSTAT_ADD(dropped, pkts_dropped);
1545 }
1546
1547 static int
in_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)1548 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1549 {
1550 struct nhop_object *nh;
1551 struct in_addr addr;
1552
1553 KASSERT(l3addr->sa_family == AF_INET,
1554 ("sin_family %d", l3addr->sa_family));
1555
1556 addr = ((const struct sockaddr_in *)l3addr)->sin_addr;
1557
1558 nh = fib4_lookup(ifp->if_fib, addr, 0, NHR_NONE, 0);
1559 if (nh == NULL)
1560 return (EINVAL);
1561
1562 /*
1563 * If the gateway for an existing host route matches the target L3
1564 * address, which is a special route inserted by some implementation
1565 * such as MANET, and the interface is of the correct type, then
1566 * allow for ARP to proceed.
1567 */
1568 if (nh->nh_flags & NHF_GATEWAY) {
1569 if (!(nh->nh_flags & NHF_HOST) || nh->nh_ifp->if_type != IFT_ETHER ||
1570 (nh->nh_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1571 memcmp(nh->gw_sa.sa_data, l3addr->sa_data,
1572 sizeof(in_addr_t)) != 0) {
1573 return (EINVAL);
1574 }
1575 }
1576
1577 /*
1578 * Make sure that at least the destination address is covered
1579 * by the route. This is for handling the case where 2 or more
1580 * interfaces have the same prefix. An incoming packet arrives
1581 * on one interface and the corresponding outgoing packet leaves
1582 * another interface.
1583 */
1584 if ((nh->nh_ifp != ifp) && (nh->nh_flags & NHF_HOST) == 0) {
1585 struct in_ifaddr *ia = (struct in_ifaddr *)ifaof_ifpforaddr(l3addr, ifp);
1586 struct in_addr dst_addr, mask_addr;
1587
1588 if (ia == NULL)
1589 return (EINVAL);
1590
1591 /*
1592 * ifaof_ifpforaddr() returns _best matching_ IFA.
1593 * It is possible that ifa prefix does not cover our address.
1594 * Explicitly verify and fail if that's the case.
1595 */
1596 dst_addr = IA_SIN(ia)->sin_addr;
1597 mask_addr.s_addr = htonl(ia->ia_subnetmask);
1598
1599 if (!IN_ARE_MASKED_ADDR_EQUAL(dst_addr, addr, mask_addr))
1600 return (EINVAL);
1601 }
1602
1603 return (0);
1604 }
1605
1606 static inline uint32_t
in_lltable_hash_dst(const struct in_addr dst,uint32_t hsize)1607 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1608 {
1609
1610 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1611 }
1612
1613 static uint32_t
in_lltable_hash(const struct llentry * lle,uint32_t hsize)1614 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1615 {
1616
1617 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1618 }
1619
1620 static void
in_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)1621 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1622 {
1623 struct sockaddr_in *sin;
1624
1625 sin = (struct sockaddr_in *)sa;
1626 bzero(sin, sizeof(*sin));
1627 sin->sin_family = AF_INET;
1628 sin->sin_len = sizeof(*sin);
1629 sin->sin_addr = lle->r_l3addr.addr4;
1630 }
1631
1632 static inline struct llentry *
in_lltable_find_dst(struct lltable * llt,struct in_addr dst)1633 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1634 {
1635 struct llentry *lle;
1636 struct llentries *lleh;
1637 u_int hashidx;
1638
1639 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1640 lleh = &llt->lle_head[hashidx];
1641 CK_LIST_FOREACH(lle, lleh, lle_next) {
1642 if (lle->la_flags & LLE_DELETED)
1643 continue;
1644 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1645 break;
1646 }
1647
1648 return (lle);
1649 }
1650
1651 static void
in_lltable_delete_entry(struct lltable * llt,struct llentry * lle)1652 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1653 {
1654
1655 lle->la_flags |= LLE_DELETED;
1656 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1657 #ifdef DIAGNOSTIC
1658 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1659 #endif
1660 llentry_free(lle);
1661 }
1662
1663 static struct llentry *
in_lltable_alloc(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1664 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1665 {
1666 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1667 struct ifnet *ifp = llt->llt_ifp;
1668 struct llentry *lle;
1669 char linkhdr[LLE_MAX_LINKHDR];
1670 size_t linkhdrsize;
1671 int lladdr_off;
1672
1673 KASSERT(l3addr->sa_family == AF_INET,
1674 ("sin_family %d", l3addr->sa_family));
1675
1676 /*
1677 * A route that covers the given address must have
1678 * been installed 1st because we are doing a resolution,
1679 * verify this.
1680 */
1681 if (!(flags & LLE_IFADDR) &&
1682 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1683 return (NULL);
1684
1685 lle = in_lltable_new(sin->sin_addr, flags);
1686 if (lle == NULL) {
1687 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1688 return (NULL);
1689 }
1690 lle->la_flags = flags;
1691 if (flags & LLE_STATIC)
1692 lle->r_flags |= RLLE_VALID;
1693 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1694 linkhdrsize = LLE_MAX_LINKHDR;
1695 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1696 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
1697 in_lltable_free_entry(llt, lle);
1698 return (NULL);
1699 }
1700 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1701 lladdr_off);
1702 lle->la_flags |= LLE_STATIC;
1703 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1704 lle->la_expire = 0;
1705 }
1706
1707 return (lle);
1708 }
1709
1710 /*
1711 * Return NULL if not found or marked for deletion.
1712 * If found return lle read locked.
1713 */
1714 static struct llentry *
in_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1715 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1716 {
1717 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1718 struct llentry *lle;
1719
1720 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1721 KASSERT(l3addr->sa_family == AF_INET,
1722 ("sin_family %d", l3addr->sa_family));
1723 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
1724 (LLE_UNLOCKED | LLE_EXCLUSIVE),
1725 ("wrong lle request flags: %#x", flags));
1726
1727 lle = in_lltable_find_dst(llt, sin->sin_addr);
1728 if (lle == NULL)
1729 return (NULL);
1730 if (flags & LLE_UNLOCKED)
1731 return (lle);
1732
1733 if (flags & LLE_EXCLUSIVE)
1734 LLE_WLOCK(lle);
1735 else
1736 LLE_RLOCK(lle);
1737
1738 /*
1739 * If the afdata lock is not held, the LLE may have been unlinked while
1740 * we were blocked on the LLE lock. Check for this case.
1741 */
1742 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
1743 if (flags & LLE_EXCLUSIVE)
1744 LLE_WUNLOCK(lle);
1745 else
1746 LLE_RUNLOCK(lle);
1747 return (NULL);
1748 }
1749 return (lle);
1750 }
1751
1752 static int
in_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct sysctl_req * wr)1753 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1754 struct sysctl_req *wr)
1755 {
1756 struct ifnet *ifp = llt->llt_ifp;
1757 /* XXX stack use */
1758 struct {
1759 struct rt_msghdr rtm;
1760 struct sockaddr_in sin;
1761 struct sockaddr_dl sdl;
1762 } arpc;
1763 struct sockaddr_dl *sdl;
1764 int error;
1765
1766 bzero(&arpc, sizeof(arpc));
1767 /* skip deleted entries */
1768 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1769 return (0);
1770 /* Skip if jailed and not a valid IP of the prison. */
1771 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1772 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&arpc.sin) != 0)
1773 return (0);
1774 /*
1775 * produce a msg made of:
1776 * struct rt_msghdr;
1777 * struct sockaddr_in; (IPv4)
1778 * struct sockaddr_dl;
1779 */
1780 arpc.rtm.rtm_msglen = sizeof(arpc);
1781 arpc.rtm.rtm_version = RTM_VERSION;
1782 arpc.rtm.rtm_type = RTM_GET;
1783 arpc.rtm.rtm_flags = RTF_UP;
1784 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1785
1786 /* publish */
1787 if (lle->la_flags & LLE_PUB)
1788 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1789
1790 sdl = &arpc.sdl;
1791 sdl->sdl_family = AF_LINK;
1792 sdl->sdl_len = sizeof(*sdl);
1793 sdl->sdl_index = ifp->if_index;
1794 sdl->sdl_type = ifp->if_type;
1795 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1796 sdl->sdl_alen = ifp->if_addrlen;
1797 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1798 } else {
1799 sdl->sdl_alen = 0;
1800 bzero(LLADDR(sdl), ifp->if_addrlen);
1801 }
1802
1803 arpc.rtm.rtm_rmx.rmx_expire =
1804 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1805 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1806 if (lle->la_flags & LLE_STATIC)
1807 arpc.rtm.rtm_flags |= RTF_STATIC;
1808 if (lle->la_flags & LLE_IFADDR)
1809 arpc.rtm.rtm_flags |= RTF_PINNED;
1810 arpc.rtm.rtm_index = ifp->if_index;
1811 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1812
1813 return (error);
1814 }
1815
1816 static void
in_lltable_post_resolved(struct lltable * llt,struct llentry * lle)1817 in_lltable_post_resolved(struct lltable *llt, struct llentry *lle)
1818 {
1819 struct ifnet *ifp = llt->llt_ifp;
1820
1821 /* gratuitous ARP */
1822 if ((lle->la_flags & LLE_PUB) != 0)
1823 arprequest(ifp, &lle->r_l3addr.addr4, &lle->r_l3addr.addr4,
1824 lle->ll_addr);
1825 }
1826
1827 static struct lltable *
in_lltattach(struct ifnet * ifp)1828 in_lltattach(struct ifnet *ifp)
1829 {
1830 struct lltable *llt;
1831
1832 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1833 llt->llt_af = AF_INET;
1834 llt->llt_ifp = ifp;
1835
1836 llt->llt_lookup = in_lltable_lookup;
1837 llt->llt_alloc_entry = in_lltable_alloc;
1838 llt->llt_delete_entry = in_lltable_delete_entry;
1839 llt->llt_dump_entry = in_lltable_dump_entry;
1840 llt->llt_hash = in_lltable_hash;
1841 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1842 llt->llt_free_entry = in_lltable_free_entry;
1843 llt->llt_match_prefix = in_lltable_match_prefix;
1844 llt->llt_mark_used = llentry_mark_used;
1845 llt->llt_post_resolved = in_lltable_post_resolved;
1846 lltable_link(llt);
1847
1848 return (llt);
1849 }
1850
1851 struct lltable *
in_lltable_get(struct ifnet * ifp)1852 in_lltable_get(struct ifnet *ifp)
1853 {
1854 struct lltable *llt = NULL;
1855
1856 void *afdata_ptr = ifp->if_afdata[AF_INET];
1857 if (afdata_ptr != NULL)
1858 llt = ((struct in_ifinfo *)afdata_ptr)->ii_llt;
1859 return (llt);
1860 }
1861
1862 void *
in_domifattach(struct ifnet * ifp)1863 in_domifattach(struct ifnet *ifp)
1864 {
1865 struct in_ifinfo *ii;
1866
1867 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1868
1869 ii->ii_llt = in_lltattach(ifp);
1870 ii->ii_igmp = igmp_domifattach(ifp);
1871
1872 return (ii);
1873 }
1874
1875 void
in_domifdetach(struct ifnet * ifp,void * aux)1876 in_domifdetach(struct ifnet *ifp, void *aux)
1877 {
1878 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1879
1880 igmp_domifdetach(ifp);
1881 lltable_free(ii->ii_llt);
1882 free(ii, M_IFADDR);
1883 }
1884