1 /*-
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (C) 2001 WIDE Project. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 4. Neither the name of the University nor the names of its contributors
15 * may be used to endorse or promote products derived from this software
16 * without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 *
30 * @(#)in.c 8.4 (Berkeley) 1/9/95
31 */
32
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
35
36 #include "opt_mpath.h"
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/rmlock.h>
50 #include <sys/sysctl.h>
51 #include <sys/syslog.h>
52 #include <sys/sx.h>
53
54 #include <net/if.h>
55 #include <net/if_var.h>
56 #include <net/if_arp.h>
57 #include <net/if_dl.h>
58 #include <net/if_llatbl.h>
59 #include <net/if_types.h>
60 #include <net/route.h>
61 #include <net/vnet.h>
62
63 #include <netinet/if_ether.h>
64 #include <netinet/in.h>
65 #include <netinet/in_var.h>
66 #include <netinet/in_pcb.h>
67 #include <netinet/ip_var.h>
68 #include <netinet/ip_carp.h>
69 #include <netinet/igmp_var.h>
70 #include <netinet/udp.h>
71 #include <netinet/udp_var.h>
72
73 static int in_aifaddr_ioctl(u_long, caddr_t, struct ifnet *, struct thread *);
74 static int in_difaddr_ioctl(caddr_t, struct ifnet *, struct thread *);
75
76 static void in_socktrim(struct sockaddr_in *);
77 static void in_purgemaddrs(struct ifnet *);
78
79 static VNET_DEFINE(int, nosameprefix);
80 #define V_nosameprefix VNET(nosameprefix)
81 SYSCTL_INT(_net_inet_ip, OID_AUTO, no_same_prefix, CTLFLAG_VNET | CTLFLAG_RW,
82 &VNET_NAME(nosameprefix), 0,
83 "Refuse to create same prefixes on different interfaces");
84
85 VNET_DECLARE(struct inpcbinfo, ripcbinfo);
86 #define V_ripcbinfo VNET(ripcbinfo)
87
88 static struct sx in_control_sx;
89 SX_SYSINIT(in_control_sx, &in_control_sx, "in_control");
90
91 /*
92 * Return 1 if an internet address is for a ``local'' host
93 * (one to which we have a connection).
94 */
95 int
in_localaddr(struct in_addr in)96 in_localaddr(struct in_addr in)
97 {
98 struct rm_priotracker in_ifa_tracker;
99 register u_long i = ntohl(in.s_addr);
100 register struct in_ifaddr *ia;
101
102 IN_IFADDR_RLOCK(&in_ifa_tracker);
103 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
104 if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
105 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
106 return (1);
107 }
108 }
109 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
110 return (0);
111 }
112
113 /*
114 * Return 1 if an internet address is for the local host and configured
115 * on one of its interfaces.
116 */
117 int
in_localip(struct in_addr in)118 in_localip(struct in_addr in)
119 {
120 struct rm_priotracker in_ifa_tracker;
121 struct in_ifaddr *ia;
122
123 IN_IFADDR_RLOCK(&in_ifa_tracker);
124 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
125 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
126 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
127 return (1);
128 }
129 }
130 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
131 return (0);
132 }
133
134 /*
135 * Return 1 if an internet address is configured on an interface.
136 */
137 int
in_ifhasaddr(struct ifnet * ifp,struct in_addr in)138 in_ifhasaddr(struct ifnet *ifp, struct in_addr in)
139 {
140 struct ifaddr *ifa;
141 struct in_ifaddr *ia;
142
143 IF_ADDR_RLOCK(ifp);
144 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
145 if (ifa->ifa_addr->sa_family != AF_INET)
146 continue;
147 ia = (struct in_ifaddr *)ifa;
148 if (ia->ia_addr.sin_addr.s_addr == in.s_addr) {
149 IF_ADDR_RUNLOCK(ifp);
150 return (1);
151 }
152 }
153 IF_ADDR_RUNLOCK(ifp);
154
155 return (0);
156 }
157
158 /*
159 * Return a reference to the interface address which is different to
160 * the supplied one but with same IP address value.
161 */
162 static struct in_ifaddr *
in_localip_more(struct in_ifaddr * ia)163 in_localip_more(struct in_ifaddr *ia)
164 {
165 struct rm_priotracker in_ifa_tracker;
166 in_addr_t in = IA_SIN(ia)->sin_addr.s_addr;
167 struct in_ifaddr *it;
168
169 IN_IFADDR_RLOCK(&in_ifa_tracker);
170 LIST_FOREACH(it, INADDR_HASH(in), ia_hash) {
171 if (it != ia && IA_SIN(it)->sin_addr.s_addr == in) {
172 ifa_ref(&it->ia_ifa);
173 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
174 return (it);
175 }
176 }
177 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
178
179 return (NULL);
180 }
181
182 /*
183 * Determine whether an IP address is in a reserved set of addresses
184 * that may not be forwarded, or whether datagrams to that destination
185 * may be forwarded.
186 */
187 int
in_canforward(struct in_addr in)188 in_canforward(struct in_addr in)
189 {
190 register u_long i = ntohl(in.s_addr);
191 register u_long net;
192
193 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
194 return (0);
195 if (IN_CLASSA(i)) {
196 net = i & IN_CLASSA_NET;
197 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
198 return (0);
199 }
200 return (1);
201 }
202
203 /*
204 * Trim a mask in a sockaddr
205 */
206 static void
in_socktrim(struct sockaddr_in * ap)207 in_socktrim(struct sockaddr_in *ap)
208 {
209 register char *cplim = (char *) &ap->sin_addr;
210 register char *cp = (char *) (&ap->sin_addr + 1);
211
212 ap->sin_len = 0;
213 while (--cp >= cplim)
214 if (*cp) {
215 (ap)->sin_len = cp - (char *) (ap) + 1;
216 break;
217 }
218 }
219
220 /*
221 * Generic internet control operations (ioctl's).
222 */
223 int
in_control(struct socket * so,u_long cmd,caddr_t data,struct ifnet * ifp,struct thread * td)224 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
225 struct thread *td)
226 {
227 struct ifreq *ifr = (struct ifreq *)data;
228 struct sockaddr_in *addr = (struct sockaddr_in *)&ifr->ifr_addr;
229 struct ifaddr *ifa;
230 struct in_ifaddr *ia;
231 int error;
232
233 if (ifp == NULL)
234 return (EADDRNOTAVAIL);
235
236 /*
237 * Filter out 4 ioctls we implement directly. Forward the rest
238 * to specific functions and ifp->if_ioctl().
239 */
240 switch (cmd) {
241 case SIOCGIFADDR:
242 case SIOCGIFBRDADDR:
243 case SIOCGIFDSTADDR:
244 case SIOCGIFNETMASK:
245 break;
246 case SIOCDIFADDR:
247 sx_xlock(&in_control_sx);
248 error = in_difaddr_ioctl(data, ifp, td);
249 sx_xunlock(&in_control_sx);
250 return (error);
251 case OSIOCAIFADDR: /* 9.x compat */
252 case SIOCAIFADDR:
253 sx_xlock(&in_control_sx);
254 error = in_aifaddr_ioctl(cmd, data, ifp, td);
255 sx_xunlock(&in_control_sx);
256 return (error);
257 case SIOCSIFADDR:
258 case SIOCSIFBRDADDR:
259 case SIOCSIFDSTADDR:
260 case SIOCSIFNETMASK:
261 /* We no longer support that old commands. */
262 return (EINVAL);
263 default:
264 if (ifp->if_ioctl == NULL)
265 return (EOPNOTSUPP);
266 return ((*ifp->if_ioctl)(ifp, cmd, data));
267 }
268
269 if (addr->sin_addr.s_addr != INADDR_ANY &&
270 prison_check_ip4(td->td_ucred, &addr->sin_addr) != 0)
271 return (EADDRNOTAVAIL);
272
273 /*
274 * Find address for this interface, if it exists. If an
275 * address was specified, find that one instead of the
276 * first one on the interface, if possible.
277 */
278 IF_ADDR_RLOCK(ifp);
279 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
280 if (ifa->ifa_addr->sa_family != AF_INET)
281 continue;
282 ia = (struct in_ifaddr *)ifa;
283 if (ia->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr)
284 break;
285 }
286 if (ifa == NULL)
287 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
288 if (ifa->ifa_addr->sa_family == AF_INET) {
289 ia = (struct in_ifaddr *)ifa;
290 if (prison_check_ip4(td->td_ucred,
291 &ia->ia_addr.sin_addr) == 0)
292 break;
293 }
294
295 if (ifa == NULL) {
296 IF_ADDR_RUNLOCK(ifp);
297 return (EADDRNOTAVAIL);
298 }
299
300 error = 0;
301 switch (cmd) {
302 case SIOCGIFADDR:
303 *addr = ia->ia_addr;
304 break;
305
306 case SIOCGIFBRDADDR:
307 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
308 error = EINVAL;
309 break;
310 }
311 *addr = ia->ia_broadaddr;
312 break;
313
314 case SIOCGIFDSTADDR:
315 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
316 error = EINVAL;
317 break;
318 }
319 *addr = ia->ia_dstaddr;
320 break;
321
322 case SIOCGIFNETMASK:
323 *addr = ia->ia_sockmask;
324 break;
325 }
326
327 IF_ADDR_RUNLOCK(ifp);
328
329 return (error);
330 }
331
332 static int
in_aifaddr_ioctl(u_long cmd,caddr_t data,struct ifnet * ifp,struct thread * td)333 in_aifaddr_ioctl(u_long cmd, caddr_t data, struct ifnet *ifp, struct thread *td)
334 {
335 const struct in_aliasreq *ifra = (struct in_aliasreq *)data;
336 const struct sockaddr_in *addr = &ifra->ifra_addr;
337 const struct sockaddr_in *broadaddr = &ifra->ifra_broadaddr;
338 const struct sockaddr_in *mask = &ifra->ifra_mask;
339 const struct sockaddr_in *dstaddr = &ifra->ifra_dstaddr;
340 const int vhid = (cmd == SIOCAIFADDR) ? ifra->ifra_vhid : 0;
341 struct ifaddr *ifa;
342 struct in_ifaddr *ia;
343 bool iaIsFirst;
344 int error = 0;
345
346 error = priv_check(td, PRIV_NET_ADDIFADDR);
347 if (error)
348 return (error);
349
350 /*
351 * ifra_addr must be present and be of INET family.
352 * ifra_broadaddr/ifra_dstaddr and ifra_mask are optional.
353 */
354 if (addr->sin_len != sizeof(struct sockaddr_in) ||
355 addr->sin_family != AF_INET)
356 return (EINVAL);
357 if (broadaddr->sin_len != 0 &&
358 (broadaddr->sin_len != sizeof(struct sockaddr_in) ||
359 broadaddr->sin_family != AF_INET))
360 return (EINVAL);
361 if (mask->sin_len != 0 &&
362 (mask->sin_len != sizeof(struct sockaddr_in) ||
363 mask->sin_family != AF_INET))
364 return (EINVAL);
365 if ((ifp->if_flags & IFF_POINTOPOINT) &&
366 (dstaddr->sin_len != sizeof(struct sockaddr_in) ||
367 dstaddr->sin_addr.s_addr == INADDR_ANY))
368 return (EDESTADDRREQ);
369 if (vhid > 0 && carp_attach_p == NULL)
370 return (EPROTONOSUPPORT);
371
372 /*
373 * See whether address already exist.
374 */
375 iaIsFirst = true;
376 ia = NULL;
377 IF_ADDR_RLOCK(ifp);
378 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
379 struct in_ifaddr *it;
380
381 if (ifa->ifa_addr->sa_family != AF_INET)
382 continue;
383
384 it = (struct in_ifaddr *)ifa;
385 iaIsFirst = false;
386 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
387 prison_check_ip4(td->td_ucred, &addr->sin_addr) == 0)
388 ia = it;
389 }
390 IF_ADDR_RUNLOCK(ifp);
391
392 if (ia != NULL)
393 (void )in_difaddr_ioctl(data, ifp, td);
394
395 ifa = ifa_alloc(sizeof(struct in_ifaddr), M_WAITOK);
396 ia = (struct in_ifaddr *)ifa;
397 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
398 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
399 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
400
401 ia->ia_ifp = ifp;
402 ia->ia_addr = *addr;
403 if (mask->sin_len != 0) {
404 ia->ia_sockmask = *mask;
405 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
406 } else {
407 in_addr_t i = ntohl(addr->sin_addr.s_addr);
408
409 /*
410 * Be compatible with network classes, if netmask isn't
411 * supplied, guess it based on classes.
412 */
413 if (IN_CLASSA(i))
414 ia->ia_subnetmask = IN_CLASSA_NET;
415 else if (IN_CLASSB(i))
416 ia->ia_subnetmask = IN_CLASSB_NET;
417 else
418 ia->ia_subnetmask = IN_CLASSC_NET;
419 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
420 }
421 ia->ia_subnet = ntohl(addr->sin_addr.s_addr) & ia->ia_subnetmask;
422 in_socktrim(&ia->ia_sockmask);
423
424 if (ifp->if_flags & IFF_BROADCAST) {
425 if (broadaddr->sin_len != 0) {
426 ia->ia_broadaddr = *broadaddr;
427 } else if (ia->ia_subnetmask == IN_RFC3021_MASK) {
428 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
429 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
430 ia->ia_broadaddr.sin_family = AF_INET;
431 } else {
432 ia->ia_broadaddr.sin_addr.s_addr =
433 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
434 ia->ia_broadaddr.sin_len = sizeof(struct sockaddr_in);
435 ia->ia_broadaddr.sin_family = AF_INET;
436 }
437 }
438
439 if (ifp->if_flags & IFF_POINTOPOINT)
440 ia->ia_dstaddr = *dstaddr;
441
442 /* XXXGL: rtinit() needs this strange assignment. */
443 if (ifp->if_flags & IFF_LOOPBACK)
444 ia->ia_dstaddr = ia->ia_addr;
445
446 if (vhid != 0) {
447 error = (*carp_attach_p)(&ia->ia_ifa, vhid);
448 if (error)
449 return (error);
450 }
451
452 /* if_addrhead is already referenced by ifa_alloc() */
453 IF_ADDR_WLOCK(ifp);
454 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
455 IF_ADDR_WUNLOCK(ifp);
456
457 ifa_ref(ifa); /* in_ifaddrhead */
458 IN_IFADDR_WLOCK();
459 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
460 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
461 IN_IFADDR_WUNLOCK();
462
463 /*
464 * Give the interface a chance to initialize
465 * if this is its first address,
466 * and to validate the address if necessary.
467 */
468 if (ifp->if_ioctl != NULL) {
469 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
470 if (error)
471 goto fail1;
472 }
473
474 /*
475 * Add route for the network.
476 */
477 if (vhid == 0) {
478 int flags = RTF_UP;
479
480 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
481 flags |= RTF_HOST;
482
483 error = in_addprefix(ia, flags);
484 if (error)
485 goto fail1;
486 }
487
488 /*
489 * Add a loopback route to self.
490 */
491 if (vhid == 0 && (ifp->if_flags & IFF_LOOPBACK) == 0 &&
492 ia->ia_addr.sin_addr.s_addr != INADDR_ANY &&
493 !((ifp->if_flags & IFF_POINTOPOINT) &&
494 ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)) {
495 struct in_ifaddr *eia;
496
497 eia = in_localip_more(ia);
498
499 if (eia == NULL) {
500 error = ifa_add_loopback_route((struct ifaddr *)ia,
501 (struct sockaddr *)&ia->ia_addr);
502 if (error)
503 goto fail2;
504 } else
505 ifa_free(&eia->ia_ifa);
506 }
507
508 if (iaIsFirst && (ifp->if_flags & IFF_MULTICAST)) {
509 struct in_addr allhosts_addr;
510 struct in_ifinfo *ii;
511
512 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
513 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
514
515 error = in_joingroup(ifp, &allhosts_addr, NULL,
516 &ii->ii_allhosts);
517 }
518
519 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
520
521 return (error);
522
523 fail2:
524 if (vhid == 0)
525 (void )in_scrubprefix(ia, LLE_STATIC);
526
527 fail1:
528 if (ia->ia_ifa.ifa_carp)
529 (*carp_detach_p)(&ia->ia_ifa);
530
531 IF_ADDR_WLOCK(ifp);
532 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
533 IF_ADDR_WUNLOCK(ifp);
534 ifa_free(&ia->ia_ifa); /* if_addrhead */
535
536 IN_IFADDR_WLOCK();
537 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
538 LIST_REMOVE(ia, ia_hash);
539 IN_IFADDR_WUNLOCK();
540 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
541
542 return (error);
543 }
544
545 static int
in_difaddr_ioctl(caddr_t data,struct ifnet * ifp,struct thread * td)546 in_difaddr_ioctl(caddr_t data, struct ifnet *ifp, struct thread *td)
547 {
548 const struct ifreq *ifr = (struct ifreq *)data;
549 const struct sockaddr_in *addr = (const struct sockaddr_in *)
550 &ifr->ifr_addr;
551 struct ifaddr *ifa;
552 struct in_ifaddr *ia;
553 bool deleteAny, iaIsLast;
554 int error;
555
556 if (td != NULL) {
557 error = priv_check(td, PRIV_NET_DELIFADDR);
558 if (error)
559 return (error);
560 }
561
562 if (addr->sin_len != sizeof(struct sockaddr_in) ||
563 addr->sin_family != AF_INET)
564 deleteAny = true;
565 else
566 deleteAny = false;
567
568 iaIsLast = true;
569 ia = NULL;
570 IF_ADDR_WLOCK(ifp);
571 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
572 struct in_ifaddr *it;
573
574 if (ifa->ifa_addr->sa_family != AF_INET)
575 continue;
576
577 it = (struct in_ifaddr *)ifa;
578 if (deleteAny && ia == NULL && (td == NULL ||
579 prison_check_ip4(td->td_ucred, &it->ia_addr.sin_addr) == 0))
580 ia = it;
581
582 if (it->ia_addr.sin_addr.s_addr == addr->sin_addr.s_addr &&
583 (td == NULL || prison_check_ip4(td->td_ucred,
584 &addr->sin_addr) == 0))
585 ia = it;
586
587 if (it != ia)
588 iaIsLast = false;
589 }
590
591 if (ia == NULL) {
592 IF_ADDR_WUNLOCK(ifp);
593 return (EADDRNOTAVAIL);
594 }
595
596 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
597 IF_ADDR_WUNLOCK(ifp);
598 ifa_free(&ia->ia_ifa); /* if_addrhead */
599
600 IN_IFADDR_WLOCK();
601 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
602 LIST_REMOVE(ia, ia_hash);
603 IN_IFADDR_WUNLOCK();
604
605 /*
606 * in_scrubprefix() kills the interface route.
607 */
608 in_scrubprefix(ia, LLE_STATIC);
609
610 /*
611 * in_ifadown gets rid of all the rest of
612 * the routes. This is not quite the right
613 * thing to do, but at least if we are running
614 * a routing process they will come back.
615 */
616 in_ifadown(&ia->ia_ifa, 1);
617
618 if (ia->ia_ifa.ifa_carp)
619 (*carp_detach_p)(&ia->ia_ifa);
620
621 /*
622 * If this is the last IPv4 address configured on this
623 * interface, leave the all-hosts group.
624 * No state-change report need be transmitted.
625 */
626 if (iaIsLast && (ifp->if_flags & IFF_MULTICAST)) {
627 struct in_ifinfo *ii;
628
629 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
630 IN_MULTI_LOCK();
631 if (ii->ii_allhosts) {
632 (void)in_leavegroup_locked(ii->ii_allhosts, NULL);
633 ii->ii_allhosts = NULL;
634 }
635 IN_MULTI_UNLOCK();
636 }
637
638 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
639 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
640
641 return (0);
642 }
643
644 #define rtinitflags(x) \
645 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
646 ? RTF_HOST : 0)
647
648 /*
649 * Check if we have a route for the given prefix already or add one accordingly.
650 */
651 int
in_addprefix(struct in_ifaddr * target,int flags)652 in_addprefix(struct in_ifaddr *target, int flags)
653 {
654 struct rm_priotracker in_ifa_tracker;
655 struct in_ifaddr *ia;
656 struct in_addr prefix, mask, p, m;
657 int error;
658
659 if ((flags & RTF_HOST) != 0) {
660 prefix = target->ia_dstaddr.sin_addr;
661 mask.s_addr = 0;
662 } else {
663 prefix = target->ia_addr.sin_addr;
664 mask = target->ia_sockmask.sin_addr;
665 prefix.s_addr &= mask.s_addr;
666 }
667
668 IN_IFADDR_RLOCK(&in_ifa_tracker);
669 /* Look for an existing address with the same prefix, mask, and fib */
670 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
671 if (rtinitflags(ia)) {
672 p = ia->ia_dstaddr.sin_addr;
673
674 if (prefix.s_addr != p.s_addr)
675 continue;
676 } else {
677 p = ia->ia_addr.sin_addr;
678 m = ia->ia_sockmask.sin_addr;
679 p.s_addr &= m.s_addr;
680
681 if (prefix.s_addr != p.s_addr ||
682 mask.s_addr != m.s_addr)
683 continue;
684 }
685 if (target->ia_ifp->if_fib != ia->ia_ifp->if_fib)
686 continue;
687
688 /*
689 * If we got a matching prefix route inserted by other
690 * interface address, we are done here.
691 */
692 if (ia->ia_flags & IFA_ROUTE) {
693 #ifdef RADIX_MPATH
694 if (ia->ia_addr.sin_addr.s_addr ==
695 target->ia_addr.sin_addr.s_addr) {
696 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
697 return (EEXIST);
698 } else
699 break;
700 #endif
701 if (V_nosameprefix) {
702 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
703 return (EEXIST);
704 } else {
705 int fibnum;
706
707 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
708 target->ia_ifp->if_fib;
709 rt_addrmsg(RTM_ADD, &target->ia_ifa, fibnum);
710 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
711 return (0);
712 }
713 }
714 }
715 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
716
717 /*
718 * No-one seem to have this prefix route, so we try to insert it.
719 */
720 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
721 if (!error)
722 target->ia_flags |= IFA_ROUTE;
723 return (error);
724 }
725
726 /*
727 * Removes either all lle entries for given @ia, or lle
728 * corresponding to @ia address.
729 */
730 static void
in_scrubprefixlle(struct in_ifaddr * ia,int all,u_int flags)731 in_scrubprefixlle(struct in_ifaddr *ia, int all, u_int flags)
732 {
733 struct sockaddr_in addr, mask;
734 struct sockaddr *saddr, *smask;
735 struct ifnet *ifp;
736
737 saddr = (struct sockaddr *)&addr;
738 bzero(&addr, sizeof(addr));
739 addr.sin_len = sizeof(addr);
740 addr.sin_family = AF_INET;
741 smask = (struct sockaddr *)&mask;
742 bzero(&mask, sizeof(mask));
743 mask.sin_len = sizeof(mask);
744 mask.sin_family = AF_INET;
745 mask.sin_addr.s_addr = ia->ia_subnetmask;
746 ifp = ia->ia_ifp;
747
748 if (all) {
749
750 /*
751 * Remove all L2 entries matching given prefix.
752 * Convert address to host representation to avoid
753 * doing this on every callback. ia_subnetmask is already
754 * stored in host representation.
755 */
756 addr.sin_addr.s_addr = ntohl(ia->ia_addr.sin_addr.s_addr);
757 lltable_prefix_free(AF_INET, saddr, smask, flags);
758 } else {
759 /* Remove interface address only */
760 addr.sin_addr.s_addr = ia->ia_addr.sin_addr.s_addr;
761 lltable_delete_addr(LLTABLE(ifp), LLE_IFADDR, saddr);
762 }
763 }
764
765 /*
766 * If there is no other address in the system that can serve a route to the
767 * same prefix, remove the route. Hand over the route to the new address
768 * otherwise.
769 */
770 int
in_scrubprefix(struct in_ifaddr * target,u_int flags)771 in_scrubprefix(struct in_ifaddr *target, u_int flags)
772 {
773 struct rm_priotracker in_ifa_tracker;
774 struct in_ifaddr *ia;
775 struct in_addr prefix, mask, p, m;
776 int error = 0;
777
778 /*
779 * Remove the loopback route to the interface address.
780 */
781 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
782 !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
783 (flags & LLE_STATIC)) {
784 struct in_ifaddr *eia;
785
786 /*
787 * XXXME: add fib-aware in_localip.
788 * We definitely don't want to switch between
789 * prefixes in different fibs.
790 */
791 eia = in_localip_more(target);
792
793 if (eia != NULL) {
794 error = ifa_switch_loopback_route((struct ifaddr *)eia,
795 (struct sockaddr *)&target->ia_addr);
796 ifa_free(&eia->ia_ifa);
797 } else {
798 error = ifa_del_loopback_route((struct ifaddr *)target,
799 (struct sockaddr *)&target->ia_addr);
800 }
801 }
802
803 if (rtinitflags(target)) {
804 prefix = target->ia_dstaddr.sin_addr;
805 mask.s_addr = 0;
806 } else {
807 prefix = target->ia_addr.sin_addr;
808 mask = target->ia_sockmask.sin_addr;
809 prefix.s_addr &= mask.s_addr;
810 }
811
812 if ((target->ia_flags & IFA_ROUTE) == 0) {
813 int fibnum;
814
815 fibnum = V_rt_add_addr_allfibs ? RT_ALL_FIBS :
816 target->ia_ifp->if_fib;
817 rt_addrmsg(RTM_DELETE, &target->ia_ifa, fibnum);
818
819 /*
820 * Removing address from !IFF_UP interface or
821 * prefix which exists on other interface (along with route).
822 * No entries should exist here except target addr.
823 * Given that, delete this entry only.
824 */
825 in_scrubprefixlle(target, 0, flags);
826 return (0);
827 }
828
829 IN_IFADDR_RLOCK(&in_ifa_tracker);
830 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
831 if (rtinitflags(ia)) {
832 p = ia->ia_dstaddr.sin_addr;
833
834 if (prefix.s_addr != p.s_addr)
835 continue;
836 } else {
837 p = ia->ia_addr.sin_addr;
838 m = ia->ia_sockmask.sin_addr;
839 p.s_addr &= m.s_addr;
840
841 if (prefix.s_addr != p.s_addr ||
842 mask.s_addr != m.s_addr)
843 continue;
844 }
845
846 if ((ia->ia_ifp->if_flags & IFF_UP) == 0)
847 continue;
848
849 /*
850 * If we got a matching prefix address, move IFA_ROUTE and
851 * the route itself to it. Make sure that routing daemons
852 * get a heads-up.
853 */
854 if ((ia->ia_flags & IFA_ROUTE) == 0) {
855 ifa_ref(&ia->ia_ifa);
856 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
857 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
858 rtinitflags(target));
859 if (error == 0)
860 target->ia_flags &= ~IFA_ROUTE;
861 else
862 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
863 error);
864 /* Scrub all entries IFF interface is different */
865 in_scrubprefixlle(target, target->ia_ifp != ia->ia_ifp,
866 flags);
867 error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
868 rtinitflags(ia) | RTF_UP);
869 if (error == 0)
870 ia->ia_flags |= IFA_ROUTE;
871 else
872 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
873 error);
874 ifa_free(&ia->ia_ifa);
875 return (error);
876 }
877 }
878 IN_IFADDR_RUNLOCK(&in_ifa_tracker);
879
880 /*
881 * remove all L2 entries on the given prefix
882 */
883 in_scrubprefixlle(target, 1, flags);
884
885 /*
886 * As no-one seem to have this prefix, we can remove the route.
887 */
888 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
889 if (error == 0)
890 target->ia_flags &= ~IFA_ROUTE;
891 else
892 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
893 return (error);
894 }
895
896 #undef rtinitflags
897
898 /*
899 * Return 1 if the address might be a local broadcast address.
900 */
901 int
in_broadcast(struct in_addr in,struct ifnet * ifp)902 in_broadcast(struct in_addr in, struct ifnet *ifp)
903 {
904 register struct ifaddr *ifa;
905 u_long t;
906
907 if (in.s_addr == INADDR_BROADCAST ||
908 in.s_addr == INADDR_ANY)
909 return (1);
910 if ((ifp->if_flags & IFF_BROADCAST) == 0)
911 return (0);
912 t = ntohl(in.s_addr);
913 /*
914 * Look through the list of addresses for a match
915 * with a broadcast address.
916 */
917 #define ia ((struct in_ifaddr *)ifa)
918 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
919 if (ifa->ifa_addr->sa_family == AF_INET &&
920 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
921 /*
922 * Check for old-style (host 0) broadcast, but
923 * taking into account that RFC 3021 obsoletes it.
924 */
925 (ia->ia_subnetmask != IN_RFC3021_MASK &&
926 t == ia->ia_subnet)) &&
927 /*
928 * Check for an all one subnetmask. These
929 * only exist when an interface gets a secondary
930 * address.
931 */
932 ia->ia_subnetmask != (u_long)0xffffffff)
933 return (1);
934 return (0);
935 #undef ia
936 }
937
938 /*
939 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
940 */
941 void
in_ifdetach(struct ifnet * ifp)942 in_ifdetach(struct ifnet *ifp)
943 {
944
945 in_pcbpurgeif0(&V_ripcbinfo, ifp);
946 in_pcbpurgeif0(&V_udbinfo, ifp);
947 in_pcbpurgeif0(&V_ulitecbinfo, ifp);
948 in_purgemaddrs(ifp);
949 }
950
951 /*
952 * Delete all IPv4 multicast address records, and associated link-layer
953 * multicast address records, associated with ifp.
954 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
955 * XXX This should not race with ifma_protospec being set during
956 * a new allocation, if it does, we have bigger problems.
957 */
958 static void
in_purgemaddrs(struct ifnet * ifp)959 in_purgemaddrs(struct ifnet *ifp)
960 {
961 LIST_HEAD(,in_multi) purgeinms;
962 struct in_multi *inm, *tinm;
963 struct ifmultiaddr *ifma;
964
965 LIST_INIT(&purgeinms);
966 IN_MULTI_LOCK();
967
968 /*
969 * Extract list of in_multi associated with the detaching ifp
970 * which the PF_INET layer is about to release.
971 * We need to do this as IF_ADDR_LOCK() may be re-acquired
972 * by code further down.
973 */
974 IF_ADDR_RLOCK(ifp);
975 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
976 if (ifma->ifma_addr->sa_family != AF_INET ||
977 ifma->ifma_protospec == NULL)
978 continue;
979 #if 0
980 KASSERT(ifma->ifma_protospec != NULL,
981 ("%s: ifma_protospec is NULL", __func__));
982 #endif
983 inm = (struct in_multi *)ifma->ifma_protospec;
984 LIST_INSERT_HEAD(&purgeinms, inm, inm_link);
985 }
986 IF_ADDR_RUNLOCK(ifp);
987
988 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) {
989 LIST_REMOVE(inm, inm_link);
990 inm_release_locked(inm);
991 }
992 igmp_ifdetach(ifp);
993
994 IN_MULTI_UNLOCK();
995 }
996
997 struct in_llentry {
998 struct llentry base;
999 };
1000
1001 #define IN_LLTBL_DEFAULT_HSIZE 32
1002 #define IN_LLTBL_HASH(k, h) \
1003 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
1004
1005 /*
1006 * Do actual deallocation of @lle.
1007 * Called by LLE_FREE_LOCKED when number of references
1008 * drops to zero.
1009 */
1010 static void
in_lltable_destroy_lle(struct llentry * lle)1011 in_lltable_destroy_lle(struct llentry *lle)
1012 {
1013
1014 LLE_WUNLOCK(lle);
1015 LLE_LOCK_DESTROY(lle);
1016 LLE_REQ_DESTROY(lle);
1017 free(lle, M_LLTABLE);
1018 }
1019
1020 static struct llentry *
in_lltable_new(struct in_addr addr4,u_int flags)1021 in_lltable_new(struct in_addr addr4, u_int flags)
1022 {
1023 struct in_llentry *lle;
1024
1025 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
1026 if (lle == NULL) /* NB: caller generates msg */
1027 return NULL;
1028
1029 /*
1030 * For IPv4 this will trigger "arpresolve" to generate
1031 * an ARP request.
1032 */
1033 lle->base.la_expire = time_uptime; /* mark expired */
1034 lle->base.r_l3addr.addr4 = addr4;
1035 lle->base.lle_refcnt = 1;
1036 lle->base.lle_free = in_lltable_destroy_lle;
1037 LLE_LOCK_INIT(&lle->base);
1038 LLE_REQ_INIT(&lle->base);
1039 callout_init(&lle->base.lle_timer, 1);
1040
1041 return (&lle->base);
1042 }
1043
1044 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1045 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
1046
1047 static int
in_lltable_match_prefix(const struct sockaddr * saddr,const struct sockaddr * smask,u_int flags,struct llentry * lle)1048 in_lltable_match_prefix(const struct sockaddr *saddr,
1049 const struct sockaddr *smask, u_int flags, struct llentry *lle)
1050 {
1051 struct in_addr addr, mask, lle_addr;
1052
1053 addr = ((const struct sockaddr_in *)saddr)->sin_addr;
1054 mask = ((const struct sockaddr_in *)smask)->sin_addr;
1055 lle_addr.s_addr = ntohl(lle->r_l3addr.addr4.s_addr);
1056
1057 if (IN_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
1058 return (0);
1059
1060 if (lle->la_flags & LLE_IFADDR) {
1061
1062 /*
1063 * Delete LLE_IFADDR records IFF address & flag matches.
1064 * Note that addr is the interface address within prefix
1065 * being matched.
1066 * Note also we should handle 'ifdown' cases without removing
1067 * ifaddr macs.
1068 */
1069 if (addr.s_addr == lle_addr.s_addr && (flags & LLE_STATIC) != 0)
1070 return (1);
1071 return (0);
1072 }
1073
1074 /* flags & LLE_STATIC means deleting both dynamic and static entries */
1075 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
1076 return (1);
1077
1078 return (0);
1079 }
1080
1081 static void
in_lltable_free_entry(struct lltable * llt,struct llentry * lle)1082 in_lltable_free_entry(struct lltable *llt, struct llentry *lle)
1083 {
1084 struct ifnet *ifp;
1085 size_t pkts_dropped;
1086
1087 LLE_WLOCK_ASSERT(lle);
1088 KASSERT(llt != NULL, ("lltable is NULL"));
1089
1090 /* Unlink entry from table if not already */
1091 if ((lle->la_flags & LLE_LINKED) != 0) {
1092 ifp = llt->llt_ifp;
1093 IF_AFDATA_WLOCK_ASSERT(ifp);
1094 lltable_unlink_entry(llt, lle);
1095 }
1096
1097 /* cancel timer */
1098 if (callout_stop(&lle->lle_timer) > 0)
1099 LLE_REMREF(lle);
1100
1101 /* Drop hold queue */
1102 pkts_dropped = llentry_free(lle);
1103 ARPSTAT_ADD(dropped, pkts_dropped);
1104 }
1105
1106 static int
in_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)1107 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1108 {
1109 struct rt_addrinfo info;
1110 struct sockaddr_in rt_key, rt_mask;
1111 struct sockaddr rt_gateway;
1112 int rt_flags;
1113
1114 KASSERT(l3addr->sa_family == AF_INET,
1115 ("sin_family %d", l3addr->sa_family));
1116
1117 bzero(&rt_key, sizeof(rt_key));
1118 rt_key.sin_len = sizeof(rt_key);
1119 bzero(&rt_mask, sizeof(rt_mask));
1120 rt_mask.sin_len = sizeof(rt_mask);
1121 bzero(&rt_gateway, sizeof(rt_gateway));
1122 rt_gateway.sa_len = sizeof(rt_gateway);
1123
1124 bzero(&info, sizeof(info));
1125 info.rti_info[RTAX_DST] = (struct sockaddr *)&rt_key;
1126 info.rti_info[RTAX_NETMASK] = (struct sockaddr *)&rt_mask;
1127 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&rt_gateway;
1128
1129 if (rib_lookup_info(ifp->if_fib, l3addr, NHR_REF, 0, &info) != 0)
1130 return (EINVAL);
1131
1132 rt_flags = info.rti_flags;
1133
1134 /*
1135 * If the gateway for an existing host route matches the target L3
1136 * address, which is a special route inserted by some implementation
1137 * such as MANET, and the interface is of the correct type, then
1138 * allow for ARP to proceed.
1139 */
1140 if (rt_flags & RTF_GATEWAY) {
1141 if (!(rt_flags & RTF_HOST) || !info.rti_ifp ||
1142 info.rti_ifp->if_type != IFT_ETHER ||
1143 (info.rti_ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) != 0 ||
1144 memcmp(rt_gateway.sa_data, l3addr->sa_data,
1145 sizeof(in_addr_t)) != 0) {
1146 rib_free_info(&info);
1147 return (EINVAL);
1148 }
1149 }
1150 rib_free_info(&info);
1151
1152 /*
1153 * Make sure that at least the destination address is covered
1154 * by the route. This is for handling the case where 2 or more
1155 * interfaces have the same prefix. An incoming packet arrives
1156 * on one interface and the corresponding outgoing packet leaves
1157 * another interface.
1158 */
1159 if (!(rt_flags & RTF_HOST) && info.rti_ifp != ifp) {
1160 const char *sa, *mask, *addr, *lim;
1161 int len;
1162
1163 mask = (const char *)&rt_mask;
1164 /*
1165 * Just being extra cautious to avoid some custom
1166 * code getting into trouble.
1167 */
1168 if ((info.rti_addrs & RTA_NETMASK) == 0)
1169 return (EINVAL);
1170
1171 sa = (const char *)&rt_key;
1172 addr = (const char *)l3addr;
1173 len = ((const struct sockaddr_in *)l3addr)->sin_len;
1174 lim = addr + len;
1175
1176 for ( ; addr < lim; sa++, mask++, addr++) {
1177 if ((*sa ^ *addr) & *mask) {
1178 #ifdef DIAGNOSTIC
1179 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
1180 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
1181 #endif
1182 return (EINVAL);
1183 }
1184 }
1185 }
1186
1187 return (0);
1188 }
1189
1190 static inline uint32_t
in_lltable_hash_dst(const struct in_addr dst,uint32_t hsize)1191 in_lltable_hash_dst(const struct in_addr dst, uint32_t hsize)
1192 {
1193
1194 return (IN_LLTBL_HASH(dst.s_addr, hsize));
1195 }
1196
1197 static uint32_t
in_lltable_hash(const struct llentry * lle,uint32_t hsize)1198 in_lltable_hash(const struct llentry *lle, uint32_t hsize)
1199 {
1200
1201 return (in_lltable_hash_dst(lle->r_l3addr.addr4, hsize));
1202 }
1203
1204 static void
in_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)1205 in_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
1206 {
1207 struct sockaddr_in *sin;
1208
1209 sin = (struct sockaddr_in *)sa;
1210 bzero(sin, sizeof(*sin));
1211 sin->sin_family = AF_INET;
1212 sin->sin_len = sizeof(*sin);
1213 sin->sin_addr = lle->r_l3addr.addr4;
1214 }
1215
1216 static inline struct llentry *
in_lltable_find_dst(struct lltable * llt,struct in_addr dst)1217 in_lltable_find_dst(struct lltable *llt, struct in_addr dst)
1218 {
1219 struct llentry *lle;
1220 struct llentries *lleh;
1221 u_int hashidx;
1222
1223 hashidx = in_lltable_hash_dst(dst, llt->llt_hsize);
1224 lleh = &llt->lle_head[hashidx];
1225 LIST_FOREACH(lle, lleh, lle_next) {
1226 if (lle->la_flags & LLE_DELETED)
1227 continue;
1228 if (lle->r_l3addr.addr4.s_addr == dst.s_addr)
1229 break;
1230 }
1231
1232 return (lle);
1233 }
1234
1235 static void
in_lltable_delete_entry(struct lltable * llt,struct llentry * lle)1236 in_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
1237 {
1238
1239 lle->la_flags |= LLE_DELETED;
1240 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
1241 #ifdef DIAGNOSTIC
1242 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1243 #endif
1244 llentry_free(lle);
1245 }
1246
1247 static struct llentry *
in_lltable_alloc(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1248 in_lltable_alloc(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1249 {
1250 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1251 struct ifnet *ifp = llt->llt_ifp;
1252 struct llentry *lle;
1253 char linkhdr[LLE_MAX_LINKHDR];
1254 size_t linkhdrsize;
1255 int lladdr_off;
1256
1257 KASSERT(l3addr->sa_family == AF_INET,
1258 ("sin_family %d", l3addr->sa_family));
1259
1260 /*
1261 * A route that covers the given address must have
1262 * been installed 1st because we are doing a resolution,
1263 * verify this.
1264 */
1265 if (!(flags & LLE_IFADDR) &&
1266 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1267 return (NULL);
1268
1269 lle = in_lltable_new(sin->sin_addr, flags);
1270 if (lle == NULL) {
1271 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1272 return (NULL);
1273 }
1274 lle->la_flags = flags;
1275 if (flags & LLE_STATIC)
1276 lle->r_flags |= RLLE_VALID;
1277 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
1278 linkhdrsize = LLE_MAX_LINKHDR;
1279 if (lltable_calc_llheader(ifp, AF_INET, IF_LLADDR(ifp),
1280 linkhdr, &linkhdrsize, &lladdr_off) != 0)
1281 return (NULL);
1282 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
1283 lladdr_off);
1284 lle->la_flags |= LLE_STATIC;
1285 lle->r_flags |= (RLLE_VALID | RLLE_IFADDR);
1286 }
1287
1288 return (lle);
1289 }
1290
1291 /*
1292 * Return NULL if not found or marked for deletion.
1293 * If found return lle read locked.
1294 */
1295 static struct llentry *
in_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)1296 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1297 {
1298 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1299 struct llentry *lle;
1300
1301 IF_AFDATA_LOCK_ASSERT(llt->llt_ifp);
1302 KASSERT(l3addr->sa_family == AF_INET,
1303 ("sin_family %d", l3addr->sa_family));
1304 lle = in_lltable_find_dst(llt, sin->sin_addr);
1305
1306 if (lle == NULL)
1307 return (NULL);
1308
1309 KASSERT((flags & (LLE_UNLOCKED|LLE_EXCLUSIVE)) !=
1310 (LLE_UNLOCKED|LLE_EXCLUSIVE),("wrong lle request flags: 0x%X",
1311 flags));
1312
1313 if (flags & LLE_UNLOCKED)
1314 return (lle);
1315
1316 if (flags & LLE_EXCLUSIVE)
1317 LLE_WLOCK(lle);
1318 else
1319 LLE_RLOCK(lle);
1320
1321 return (lle);
1322 }
1323
1324 static int
in_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct sysctl_req * wr)1325 in_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
1326 struct sysctl_req *wr)
1327 {
1328 struct ifnet *ifp = llt->llt_ifp;
1329 /* XXX stack use */
1330 struct {
1331 struct rt_msghdr rtm;
1332 struct sockaddr_in sin;
1333 struct sockaddr_dl sdl;
1334 } arpc;
1335 struct sockaddr_dl *sdl;
1336 int error;
1337
1338 bzero(&arpc, sizeof(arpc));
1339 /* skip deleted entries */
1340 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1341 return (0);
1342 /* Skip if jailed and not a valid IP of the prison. */
1343 lltable_fill_sa_entry(lle,(struct sockaddr *)&arpc.sin);
1344 if (prison_if(wr->td->td_ucred,
1345 (struct sockaddr *)&arpc.sin) != 0)
1346 return (0);
1347 /*
1348 * produce a msg made of:
1349 * struct rt_msghdr;
1350 * struct sockaddr_in; (IPv4)
1351 * struct sockaddr_dl;
1352 */
1353 arpc.rtm.rtm_msglen = sizeof(arpc);
1354 arpc.rtm.rtm_version = RTM_VERSION;
1355 arpc.rtm.rtm_type = RTM_GET;
1356 arpc.rtm.rtm_flags = RTF_UP;
1357 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1358
1359 /* publish */
1360 if (lle->la_flags & LLE_PUB)
1361 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1362
1363 sdl = &arpc.sdl;
1364 sdl->sdl_family = AF_LINK;
1365 sdl->sdl_len = sizeof(*sdl);
1366 sdl->sdl_index = ifp->if_index;
1367 sdl->sdl_type = ifp->if_type;
1368 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1369 sdl->sdl_alen = ifp->if_addrlen;
1370 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1371 } else {
1372 sdl->sdl_alen = 0;
1373 bzero(LLADDR(sdl), ifp->if_addrlen);
1374 }
1375
1376 arpc.rtm.rtm_rmx.rmx_expire =
1377 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1378 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1379 if (lle->la_flags & LLE_STATIC)
1380 arpc.rtm.rtm_flags |= RTF_STATIC;
1381 if (lle->la_flags & LLE_IFADDR)
1382 arpc.rtm.rtm_flags |= RTF_PINNED;
1383 arpc.rtm.rtm_index = ifp->if_index;
1384 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1385
1386 return (error);
1387 }
1388
1389 static struct lltable *
in_lltattach(struct ifnet * ifp)1390 in_lltattach(struct ifnet *ifp)
1391 {
1392 struct lltable *llt;
1393
1394 llt = lltable_allocate_htbl(IN_LLTBL_DEFAULT_HSIZE);
1395 llt->llt_af = AF_INET;
1396 llt->llt_ifp = ifp;
1397
1398 llt->llt_lookup = in_lltable_lookup;
1399 llt->llt_alloc_entry = in_lltable_alloc;
1400 llt->llt_delete_entry = in_lltable_delete_entry;
1401 llt->llt_dump_entry = in_lltable_dump_entry;
1402 llt->llt_hash = in_lltable_hash;
1403 llt->llt_fill_sa_entry = in_lltable_fill_sa_entry;
1404 llt->llt_free_entry = in_lltable_free_entry;
1405 llt->llt_match_prefix = in_lltable_match_prefix;
1406 lltable_link(llt);
1407
1408 return (llt);
1409 }
1410
1411 void *
in_domifattach(struct ifnet * ifp)1412 in_domifattach(struct ifnet *ifp)
1413 {
1414 struct in_ifinfo *ii;
1415
1416 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1417
1418 ii->ii_llt = in_lltattach(ifp);
1419 ii->ii_igmp = igmp_domifattach(ifp);
1420
1421 return (ii);
1422 }
1423
1424 void
in_domifdetach(struct ifnet * ifp,void * aux)1425 in_domifdetach(struct ifnet *ifp, void *aux)
1426 {
1427 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1428
1429 igmp_domifdetach(ifp);
1430 lltable_free(ii->ii_llt);
1431 free(ii, M_IFADDR);
1432 }
1433