FreeBSD/Linux Kernel Cross Reference
sys/netinet/in.c
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: releng/9.0/sys/netinet/in.c 227002 2011-11-01 18:29:06Z qingli $");
35
36 #include "opt_mpath.h"
37
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/sockio.h>
41 #include <sys/malloc.h>
42 #include <sys/priv.h>
43 #include <sys/socket.h>
44 #include <sys/jail.h>
45 #include <sys/kernel.h>
46 #include <sys/proc.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49
50 #include <net/if.h>
51 #include <net/if_var.h>
52 #include <net/if_arp.h>
53 #include <net/if_dl.h>
54 #include <net/if_llatbl.h>
55 #include <net/if_types.h>
56 #include <net/route.h>
57 #include <net/vnet.h>
58
59 #include <netinet/in.h>
60 #include <netinet/in_var.h>
61 #include <netinet/in_pcb.h>
62 #include <netinet/ip_var.h>
63 #include <netinet/igmp_var.h>
64 #include <netinet/udp.h>
65 #include <netinet/udp_var.h>
66
67 static int in_mask2len(struct in_addr *);
68 static void in_len2mask(struct in_addr *, int);
69 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t,
70 struct ifnet *, struct thread *);
71
72 static int in_addprefix(struct in_ifaddr *, int);
73 static int in_scrubprefix(struct in_ifaddr *, u_int);
74 static void in_socktrim(struct sockaddr_in *);
75 static int in_ifinit(struct ifnet *,
76 struct in_ifaddr *, struct sockaddr_in *, int);
77 static void in_purgemaddrs(struct ifnet *);
78
79 static VNET_DEFINE(int, sameprefixcarponly);
80 #define V_sameprefixcarponly VNET(sameprefixcarponly)
81 SYSCTL_VNET_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW,
82 &VNET_NAME(sameprefixcarponly), 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 VNET_DECLARE(struct arpstat, arpstat); /* ARP statistics, see if_arp.h */
89 #define V_arpstat VNET(arpstat)
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
96 in_localaddr(struct in_addr in)
97 {
98 register u_long i = ntohl(in.s_addr);
99 register struct in_ifaddr *ia;
100
101 IN_IFADDR_RLOCK();
102 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
103 if ((i & ia->ia_subnetmask) == ia->ia_subnet) {
104 IN_IFADDR_RUNLOCK();
105 return (1);
106 }
107 }
108 IN_IFADDR_RUNLOCK();
109 return (0);
110 }
111
112 /*
113 * Return 1 if an internet address is for the local host and configured
114 * on one of its interfaces.
115 */
116 int
117 in_localip(struct in_addr in)
118 {
119 struct in_ifaddr *ia;
120
121 IN_IFADDR_RLOCK();
122 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
123 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr) {
124 IN_IFADDR_RUNLOCK();
125 return (1);
126 }
127 }
128 IN_IFADDR_RUNLOCK();
129 return (0);
130 }
131
132 /*
133 * Determine whether an IP address is in a reserved set of addresses
134 * that may not be forwarded, or whether datagrams to that destination
135 * may be forwarded.
136 */
137 int
138 in_canforward(struct in_addr in)
139 {
140 register u_long i = ntohl(in.s_addr);
141 register u_long net;
142
143 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i) || IN_LINKLOCAL(i))
144 return (0);
145 if (IN_CLASSA(i)) {
146 net = i & IN_CLASSA_NET;
147 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
148 return (0);
149 }
150 return (1);
151 }
152
153 /*
154 * Trim a mask in a sockaddr
155 */
156 static void
157 in_socktrim(struct sockaddr_in *ap)
158 {
159 register char *cplim = (char *) &ap->sin_addr;
160 register char *cp = (char *) (&ap->sin_addr + 1);
161
162 ap->sin_len = 0;
163 while (--cp >= cplim)
164 if (*cp) {
165 (ap)->sin_len = cp - (char *) (ap) + 1;
166 break;
167 }
168 }
169
170 static int
171 in_mask2len(mask)
172 struct in_addr *mask;
173 {
174 int x, y;
175 u_char *p;
176
177 p = (u_char *)mask;
178 for (x = 0; x < sizeof(*mask); x++) {
179 if (p[x] != 0xff)
180 break;
181 }
182 y = 0;
183 if (x < sizeof(*mask)) {
184 for (y = 0; y < 8; y++) {
185 if ((p[x] & (0x80 >> y)) == 0)
186 break;
187 }
188 }
189 return (x * 8 + y);
190 }
191
192 static void
193 in_len2mask(struct in_addr *mask, int len)
194 {
195 int i;
196 u_char *p;
197
198 p = (u_char *)mask;
199 bzero(mask, sizeof(*mask));
200 for (i = 0; i < len / 8; i++)
201 p[i] = 0xff;
202 if (len % 8)
203 p[i] = (0xff00 >> (len % 8)) & 0xff;
204 }
205
206 /*
207 * Generic internet control operations (ioctl's).
208 *
209 * ifp is NULL if not an interface-specific ioctl.
210 */
211 /* ARGSUSED */
212 int
213 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
214 struct thread *td)
215 {
216 register struct ifreq *ifr = (struct ifreq *)data;
217 register struct in_ifaddr *ia, *iap;
218 register struct ifaddr *ifa;
219 struct in_addr allhosts_addr;
220 struct in_addr dst;
221 struct in_ifinfo *ii;
222 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
223 struct sockaddr_in oldaddr;
224 int error, hostIsNew, iaIsNew, maskIsNew;
225 int iaIsFirst;
226
227 ia = NULL;
228 iaIsFirst = 0;
229 iaIsNew = 0;
230 allhosts_addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
231
232 /*
233 * Filter out ioctls we implement directly; forward the rest on to
234 * in_lifaddr_ioctl() and ifp->if_ioctl().
235 */
236 switch (cmd) {
237 case SIOCAIFADDR:
238 case SIOCDIFADDR:
239 case SIOCGIFADDR:
240 case SIOCGIFBRDADDR:
241 case SIOCGIFDSTADDR:
242 case SIOCGIFNETMASK:
243 case SIOCSIFADDR:
244 case SIOCSIFBRDADDR:
245 case SIOCSIFDSTADDR:
246 case SIOCSIFNETMASK:
247 break;
248
249 case SIOCALIFADDR:
250 if (td != NULL) {
251 error = priv_check(td, PRIV_NET_ADDIFADDR);
252 if (error)
253 return (error);
254 }
255 if (ifp == NULL)
256 return (EINVAL);
257 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
258
259 case SIOCDLIFADDR:
260 if (td != NULL) {
261 error = priv_check(td, PRIV_NET_DELIFADDR);
262 if (error)
263 return (error);
264 }
265 if (ifp == NULL)
266 return (EINVAL);
267 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
268
269 case SIOCGLIFADDR:
270 if (ifp == NULL)
271 return (EINVAL);
272 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
273
274 default:
275 if (ifp == NULL || ifp->if_ioctl == NULL)
276 return (EOPNOTSUPP);
277 return ((*ifp->if_ioctl)(ifp, cmd, data));
278 }
279
280 if (ifp == NULL)
281 return (EADDRNOTAVAIL);
282
283 /*
284 * Security checks before we get involved in any work.
285 */
286 switch (cmd) {
287 case SIOCAIFADDR:
288 case SIOCSIFADDR:
289 case SIOCSIFBRDADDR:
290 case SIOCSIFNETMASK:
291 case SIOCSIFDSTADDR:
292 if (td != NULL) {
293 error = priv_check(td, PRIV_NET_ADDIFADDR);
294 if (error)
295 return (error);
296 }
297 break;
298
299 case SIOCDIFADDR:
300 if (td != NULL) {
301 error = priv_check(td, PRIV_NET_DELIFADDR);
302 if (error)
303 return (error);
304 }
305 break;
306 }
307
308 /*
309 * Find address for this interface, if it exists.
310 *
311 * If an alias address was specified, find that one instead of the
312 * first one on the interface, if possible.
313 */
314 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
315 IN_IFADDR_RLOCK();
316 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash) {
317 if (iap->ia_ifp == ifp &&
318 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
319 if (td == NULL || prison_check_ip4(td->td_ucred,
320 &dst) == 0)
321 ia = iap;
322 break;
323 }
324 }
325 if (ia != NULL)
326 ifa_ref(&ia->ia_ifa);
327 IN_IFADDR_RUNLOCK();
328 if (ia == NULL) {
329 IF_ADDR_LOCK(ifp);
330 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
331 iap = ifatoia(ifa);
332 if (iap->ia_addr.sin_family == AF_INET) {
333 if (td != NULL &&
334 prison_check_ip4(td->td_ucred,
335 &iap->ia_addr.sin_addr) != 0)
336 continue;
337 ia = iap;
338 break;
339 }
340 }
341 if (ia != NULL)
342 ifa_ref(&ia->ia_ifa);
343 IF_ADDR_UNLOCK(ifp);
344 }
345 if (ia == NULL)
346 iaIsFirst = 1;
347
348 error = 0;
349 switch (cmd) {
350 case SIOCAIFADDR:
351 case SIOCDIFADDR:
352 if (ifra->ifra_addr.sin_family == AF_INET) {
353 struct in_ifaddr *oia;
354
355 IN_IFADDR_RLOCK();
356 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
357 if (ia->ia_ifp == ifp &&
358 ia->ia_addr.sin_addr.s_addr ==
359 ifra->ifra_addr.sin_addr.s_addr)
360 break;
361 }
362 if (ia != NULL && ia != oia)
363 ifa_ref(&ia->ia_ifa);
364 if (oia != NULL && ia != oia)
365 ifa_free(&oia->ia_ifa);
366 IN_IFADDR_RUNLOCK();
367 if ((ifp->if_flags & IFF_POINTOPOINT)
368 && (cmd == SIOCAIFADDR)
369 && (ifra->ifra_dstaddr.sin_addr.s_addr
370 == INADDR_ANY)) {
371 error = EDESTADDRREQ;
372 goto out;
373 }
374 }
375 if (cmd == SIOCDIFADDR && ia == NULL) {
376 error = EADDRNOTAVAIL;
377 goto out;
378 }
379 /* FALLTHROUGH */
380 case SIOCSIFADDR:
381 case SIOCSIFNETMASK:
382 case SIOCSIFDSTADDR:
383 if (ia == NULL) {
384 ia = (struct in_ifaddr *)
385 malloc(sizeof *ia, M_IFADDR, M_NOWAIT |
386 M_ZERO);
387 if (ia == NULL) {
388 error = ENOBUFS;
389 goto out;
390 }
391
392 ifa = &ia->ia_ifa;
393 ifa_init(ifa);
394 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
395 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
396 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
397
398 ia->ia_sockmask.sin_len = 8;
399 ia->ia_sockmask.sin_family = AF_INET;
400 if (ifp->if_flags & IFF_BROADCAST) {
401 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
402 ia->ia_broadaddr.sin_family = AF_INET;
403 }
404 ia->ia_ifp = ifp;
405
406 ifa_ref(ifa); /* if_addrhead */
407 IF_ADDR_LOCK(ifp);
408 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
409 IF_ADDR_UNLOCK(ifp);
410 ifa_ref(ifa); /* in_ifaddrhead */
411 IN_IFADDR_WLOCK();
412 TAILQ_INSERT_TAIL(&V_in_ifaddrhead, ia, ia_link);
413 IN_IFADDR_WUNLOCK();
414 iaIsNew = 1;
415 }
416 break;
417
418 case SIOCSIFBRDADDR:
419 case SIOCGIFADDR:
420 case SIOCGIFNETMASK:
421 case SIOCGIFDSTADDR:
422 case SIOCGIFBRDADDR:
423 if (ia == NULL) {
424 error = EADDRNOTAVAIL;
425 goto out;
426 }
427 break;
428 }
429
430 /*
431 * Most paths in this switch return directly or via out. Only paths
432 * that remove the address break in order to hit common removal code.
433 */
434 switch (cmd) {
435 case SIOCGIFADDR:
436 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
437 goto out;
438
439 case SIOCGIFBRDADDR:
440 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
441 error = EINVAL;
442 goto out;
443 }
444 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
445 goto out;
446
447 case SIOCGIFDSTADDR:
448 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
449 error = EINVAL;
450 goto out;
451 }
452 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
453 goto out;
454
455 case SIOCGIFNETMASK:
456 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
457 goto out;
458
459 case SIOCSIFDSTADDR:
460 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
461 error = EINVAL;
462 goto out;
463 }
464 oldaddr = ia->ia_dstaddr;
465 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
466 if (ifp->if_ioctl != NULL) {
467 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR,
468 (caddr_t)ia);
469 if (error) {
470 ia->ia_dstaddr = oldaddr;
471 goto out;
472 }
473 }
474 if (ia->ia_flags & IFA_ROUTE) {
475 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
476 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
477 ia->ia_ifa.ifa_dstaddr =
478 (struct sockaddr *)&ia->ia_dstaddr;
479 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
480 }
481 goto out;
482
483 case SIOCSIFBRDADDR:
484 if ((ifp->if_flags & IFF_BROADCAST) == 0) {
485 error = EINVAL;
486 goto out;
487 }
488 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
489 goto out;
490
491 case SIOCSIFADDR:
492 error = in_ifinit(ifp, ia,
493 (struct sockaddr_in *) &ifr->ifr_addr, 1);
494 if (error != 0 && iaIsNew)
495 break;
496 if (error == 0) {
497 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
498 if (iaIsFirst &&
499 (ifp->if_flags & IFF_MULTICAST) != 0) {
500 error = in_joingroup(ifp, &allhosts_addr,
501 NULL, &ii->ii_allhosts);
502 }
503 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
504 }
505 error = 0;
506 goto out;
507
508 case SIOCSIFNETMASK:
509 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
510 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
511 goto out;
512
513 case SIOCAIFADDR:
514 maskIsNew = 0;
515 hostIsNew = 1;
516 error = 0;
517 if (ia->ia_addr.sin_family == AF_INET) {
518 if (ifra->ifra_addr.sin_len == 0) {
519 ifra->ifra_addr = ia->ia_addr;
520 hostIsNew = 0;
521 } else if (ifra->ifra_addr.sin_addr.s_addr ==
522 ia->ia_addr.sin_addr.s_addr)
523 hostIsNew = 0;
524 }
525 if (ifra->ifra_mask.sin_len) {
526 /*
527 * QL: XXX
528 * Need to scrub the prefix here in case
529 * the issued command is SIOCAIFADDR with
530 * the same address, but with a different
531 * prefix length. And if the prefix length
532 * is the same as before, then the call is
533 * un-necessarily executed here.
534 */
535 in_ifscrub(ifp, ia, LLE_STATIC);
536 ia->ia_sockmask = ifra->ifra_mask;
537 ia->ia_sockmask.sin_family = AF_INET;
538 ia->ia_subnetmask =
539 ntohl(ia->ia_sockmask.sin_addr.s_addr);
540 maskIsNew = 1;
541 }
542 if ((ifp->if_flags & IFF_POINTOPOINT) &&
543 (ifra->ifra_dstaddr.sin_family == AF_INET)) {
544 in_ifscrub(ifp, ia, LLE_STATIC);
545 ia->ia_dstaddr = ifra->ifra_dstaddr;
546 maskIsNew = 1; /* We lie; but the effect's the same */
547 }
548 if (ifra->ifra_addr.sin_family == AF_INET &&
549 (hostIsNew || maskIsNew))
550 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
551 if (error != 0 && iaIsNew)
552 break;
553
554 if ((ifp->if_flags & IFF_BROADCAST) &&
555 (ifra->ifra_broadaddr.sin_family == AF_INET))
556 ia->ia_broadaddr = ifra->ifra_broadaddr;
557 if (error == 0) {
558 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
559 if (iaIsFirst &&
560 (ifp->if_flags & IFF_MULTICAST) != 0) {
561 error = in_joingroup(ifp, &allhosts_addr,
562 NULL, &ii->ii_allhosts);
563 }
564 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
565 }
566 goto out;
567
568 case SIOCDIFADDR:
569 /*
570 * in_ifscrub kills the interface route.
571 */
572 in_ifscrub(ifp, ia, LLE_STATIC);
573
574 /*
575 * in_ifadown gets rid of all the rest of
576 * the routes. This is not quite the right
577 * thing to do, but at least if we are running
578 * a routing process they will come back.
579 */
580 in_ifadown(&ia->ia_ifa, 1);
581 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
582 error = 0;
583 break;
584
585 default:
586 panic("in_control: unsupported ioctl");
587 }
588
589 IF_ADDR_LOCK(ifp);
590 /* Re-check that ia is still part of the list. */
591 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
592 if (ifa == &ia->ia_ifa)
593 break;
594 }
595 if (ifa == NULL) {
596 /*
597 * If we lost the race with another thread, there is no need to
598 * try it again for the next loop as there is no other exit
599 * path between here and out.
600 */
601 IF_ADDR_UNLOCK(ifp);
602 error = EADDRNOTAVAIL;
603 goto out;
604 }
605 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
606 IF_ADDR_UNLOCK(ifp);
607 ifa_free(&ia->ia_ifa); /* if_addrhead */
608
609 IN_IFADDR_WLOCK();
610 TAILQ_REMOVE(&V_in_ifaddrhead, ia, ia_link);
611 if (ia->ia_addr.sin_family == AF_INET) {
612 struct in_ifaddr *if_ia;
613
614 LIST_REMOVE(ia, ia_hash);
615 IN_IFADDR_WUNLOCK();
616 /*
617 * If this is the last IPv4 address configured on this
618 * interface, leave the all-hosts group.
619 * No state-change report need be transmitted.
620 */
621 if_ia = NULL;
622 IFP_TO_IA(ifp, if_ia);
623 if (if_ia == NULL) {
624 ii = ((struct in_ifinfo *)ifp->if_afdata[AF_INET]);
625 IN_MULTI_LOCK();
626 if (ii->ii_allhosts) {
627 (void)in_leavegroup_locked(ii->ii_allhosts,
628 NULL);
629 ii->ii_allhosts = NULL;
630 }
631 IN_MULTI_UNLOCK();
632 } else
633 ifa_free(&if_ia->ia_ifa);
634 } else
635 IN_IFADDR_WUNLOCK();
636 ifa_free(&ia->ia_ifa); /* in_ifaddrhead */
637 out:
638 if (ia != NULL)
639 ifa_free(&ia->ia_ifa);
640 return (error);
641 }
642
643 /*
644 * SIOC[GAD]LIFADDR.
645 * SIOCGLIFADDR: get first address. (?!?)
646 * SIOCGLIFADDR with IFLR_PREFIX:
647 * get first address that matches the specified prefix.
648 * SIOCALIFADDR: add the specified address.
649 * SIOCALIFADDR with IFLR_PREFIX:
650 * EINVAL since we can't deduce hostid part of the address.
651 * SIOCDLIFADDR: delete the specified address.
652 * SIOCDLIFADDR with IFLR_PREFIX:
653 * delete the first address that matches the specified prefix.
654 * return values:
655 * EINVAL on invalid parameters
656 * EADDRNOTAVAIL on prefix match failed/specified address not found
657 * other values may be returned from in_ioctl()
658 */
659 static int
660 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data,
661 struct ifnet *ifp, struct thread *td)
662 {
663 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
664 struct ifaddr *ifa;
665
666 /* sanity checks */
667 if (data == NULL || ifp == NULL) {
668 panic("invalid argument to in_lifaddr_ioctl");
669 /*NOTRECHED*/
670 }
671
672 switch (cmd) {
673 case SIOCGLIFADDR:
674 /* address must be specified on GET with IFLR_PREFIX */
675 if ((iflr->flags & IFLR_PREFIX) == 0)
676 break;
677 /*FALLTHROUGH*/
678 case SIOCALIFADDR:
679 case SIOCDLIFADDR:
680 /* address must be specified on ADD and DELETE */
681 if (iflr->addr.ss_family != AF_INET)
682 return (EINVAL);
683 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
684 return (EINVAL);
685 /* XXX need improvement */
686 if (iflr->dstaddr.ss_family
687 && iflr->dstaddr.ss_family != AF_INET)
688 return (EINVAL);
689 if (iflr->dstaddr.ss_family
690 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
691 return (EINVAL);
692 break;
693 default: /*shouldn't happen*/
694 return (EOPNOTSUPP);
695 }
696 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
697 return (EINVAL);
698
699 switch (cmd) {
700 case SIOCALIFADDR:
701 {
702 struct in_aliasreq ifra;
703
704 if (iflr->flags & IFLR_PREFIX)
705 return (EINVAL);
706
707 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
708 bzero(&ifra, sizeof(ifra));
709 bcopy(iflr->iflr_name, ifra.ifra_name,
710 sizeof(ifra.ifra_name));
711
712 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
713
714 if (iflr->dstaddr.ss_family) { /*XXX*/
715 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
716 iflr->dstaddr.ss_len);
717 }
718
719 ifra.ifra_mask.sin_family = AF_INET;
720 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
721 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
722
723 return (in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td));
724 }
725 case SIOCGLIFADDR:
726 case SIOCDLIFADDR:
727 {
728 struct in_ifaddr *ia;
729 struct in_addr mask, candidate, match;
730 struct sockaddr_in *sin;
731
732 bzero(&mask, sizeof(mask));
733 bzero(&match, sizeof(match));
734 if (iflr->flags & IFLR_PREFIX) {
735 /* lookup a prefix rather than address. */
736 in_len2mask(&mask, iflr->prefixlen);
737
738 sin = (struct sockaddr_in *)&iflr->addr;
739 match.s_addr = sin->sin_addr.s_addr;
740 match.s_addr &= mask.s_addr;
741
742 /* if you set extra bits, that's wrong */
743 if (match.s_addr != sin->sin_addr.s_addr)
744 return (EINVAL);
745
746 } else {
747 /* on getting an address, take the 1st match */
748 /* on deleting an address, do exact match */
749 if (cmd != SIOCGLIFADDR) {
750 in_len2mask(&mask, 32);
751 sin = (struct sockaddr_in *)&iflr->addr;
752 match.s_addr = sin->sin_addr.s_addr;
753 }
754 }
755
756 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
757 if (ifa->ifa_addr->sa_family != AF_INET6)
758 continue;
759 if (match.s_addr == 0)
760 break;
761 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
762 candidate.s_addr &= mask.s_addr;
763 if (candidate.s_addr == match.s_addr)
764 break;
765 }
766 if (ifa == NULL)
767 return (EADDRNOTAVAIL);
768 ia = (struct in_ifaddr *)ifa;
769
770 if (cmd == SIOCGLIFADDR) {
771 /* fill in the if_laddrreq structure */
772 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
773
774 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
775 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
776 ia->ia_dstaddr.sin_len);
777 } else
778 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
779
780 iflr->prefixlen =
781 in_mask2len(&ia->ia_sockmask.sin_addr);
782
783 iflr->flags = 0; /*XXX*/
784
785 return (0);
786 } else {
787 struct in_aliasreq ifra;
788
789 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
790 bzero(&ifra, sizeof(ifra));
791 bcopy(iflr->iflr_name, ifra.ifra_name,
792 sizeof(ifra.ifra_name));
793
794 bcopy(&ia->ia_addr, &ifra.ifra_addr,
795 ia->ia_addr.sin_len);
796 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
797 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
798 ia->ia_dstaddr.sin_len);
799 }
800 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
801 ia->ia_sockmask.sin_len);
802
803 return (in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
804 ifp, td));
805 }
806 }
807 }
808
809 return (EOPNOTSUPP); /*just for safety*/
810 }
811
812 /*
813 * Delete any existing route for an interface.
814 */
815 void
816 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia, u_int flags)
817 {
818
819 in_scrubprefix(ia, flags);
820 }
821
822 /*
823 * Initialize an interface's internet address
824 * and routing table entry.
825 */
826 static int
827 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia, struct sockaddr_in *sin,
828 int scrub)
829 {
830 register u_long i = ntohl(sin->sin_addr.s_addr);
831 struct sockaddr_in oldaddr;
832 int s = splimp(), flags = RTF_UP, error = 0;
833
834 oldaddr = ia->ia_addr;
835 if (oldaddr.sin_family == AF_INET)
836 LIST_REMOVE(ia, ia_hash);
837 ia->ia_addr = *sin;
838 if (ia->ia_addr.sin_family == AF_INET) {
839 IN_IFADDR_WLOCK();
840 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
841 ia, ia_hash);
842 IN_IFADDR_WUNLOCK();
843 }
844 /*
845 * Give the interface a chance to initialize
846 * if this is its first address,
847 * and to validate the address if necessary.
848 */
849 if (ifp->if_ioctl != NULL) {
850 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
851 if (error) {
852 splx(s);
853 /* LIST_REMOVE(ia, ia_hash) is done in in_control */
854 ia->ia_addr = oldaddr;
855 IN_IFADDR_WLOCK();
856 if (ia->ia_addr.sin_family == AF_INET)
857 LIST_INSERT_HEAD(INADDR_HASH(
858 ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
859 else
860 /*
861 * If oldaddr family is not AF_INET (e.g.
862 * interface has been just created) in_control
863 * does not call LIST_REMOVE, and we end up
864 * with bogus ia entries in hash
865 */
866 LIST_REMOVE(ia, ia_hash);
867 IN_IFADDR_WUNLOCK();
868 return (error);
869 }
870 }
871 splx(s);
872 if (scrub) {
873 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
874 in_ifscrub(ifp, ia, LLE_STATIC);
875 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
876 }
877 /*
878 * Be compatible with network classes, if netmask isn't supplied,
879 * guess it based on classes.
880 */
881 if (ia->ia_subnetmask == 0) {
882 if (IN_CLASSA(i))
883 ia->ia_subnetmask = IN_CLASSA_NET;
884 else if (IN_CLASSB(i))
885 ia->ia_subnetmask = IN_CLASSB_NET;
886 else
887 ia->ia_subnetmask = IN_CLASSC_NET;
888 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
889 }
890 ia->ia_subnet = i & ia->ia_subnetmask;
891 in_socktrim(&ia->ia_sockmask);
892 /*
893 * XXX: carp(4) does not have interface route
894 */
895 if (ifp->if_type == IFT_CARP)
896 return (0);
897 /*
898 * Add route for the network.
899 */
900 ia->ia_ifa.ifa_metric = ifp->if_metric;
901 if (ifp->if_flags & IFF_BROADCAST) {
902 if (ia->ia_subnetmask == IN_RFC3021_MASK)
903 ia->ia_broadaddr.sin_addr.s_addr = INADDR_BROADCAST;
904 else
905 ia->ia_broadaddr.sin_addr.s_addr =
906 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
907 } else if (ifp->if_flags & IFF_LOOPBACK) {
908 ia->ia_dstaddr = ia->ia_addr;
909 flags |= RTF_HOST;
910 } else if (ifp->if_flags & IFF_POINTOPOINT) {
911 if (ia->ia_dstaddr.sin_family != AF_INET)
912 return (0);
913 flags |= RTF_HOST;
914 }
915 if ((error = in_addprefix(ia, flags)) != 0)
916 return (error);
917
918 if (ia->ia_addr.sin_addr.s_addr == INADDR_ANY)
919 return (0);
920
921 if (ifp->if_flags & IFF_POINTOPOINT) {
922 if (ia->ia_dstaddr.sin_addr.s_addr == ia->ia_addr.sin_addr.s_addr)
923 return (0);
924 }
925
926
927 /*
928 * add a loopback route to self
929 */
930 if (V_useloopback && !(ifp->if_flags & IFF_LOOPBACK)) {
931 struct route ia_ro;
932
933 bzero(&ia_ro, sizeof(ia_ro));
934 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = ia->ia_addr;
935 rtalloc_ign_fib(&ia_ro, 0, 0);
936 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) &&
937 (ia_ro.ro_rt->rt_ifp == V_loif)) {
938 RT_LOCK(ia_ro.ro_rt);
939 RT_ADDREF(ia_ro.ro_rt);
940 RTFREE_LOCKED(ia_ro.ro_rt);
941 } else
942 error = ifa_add_loopback_route((struct ifaddr *)ia,
943 (struct sockaddr *)&ia->ia_addr);
944 if (error == 0)
945 ia->ia_flags |= IFA_RTSELF;
946 if (ia_ro.ro_rt != NULL)
947 RTFREE(ia_ro.ro_rt);
948 }
949
950 return (error);
951 }
952
953 #define rtinitflags(x) \
954 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
955 ? RTF_HOST : 0)
956
957 /*
958 * Generate a routing message when inserting or deleting
959 * an interface address alias.
960 */
961 static void in_addralias_rtmsg(int cmd, struct in_addr *prefix,
962 struct in_ifaddr *target)
963 {
964 struct route pfx_ro;
965 struct sockaddr_in *pfx_addr;
966 struct rtentry msg_rt;
967
968 /* QL: XXX
969 * This is a bit questionable because there is no
970 * additional route entry added/deleted for an address
971 * alias. Therefore this route report is inaccurate.
972 */
973 bzero(&pfx_ro, sizeof(pfx_ro));
974 pfx_addr = (struct sockaddr_in *)(&pfx_ro.ro_dst);
975 pfx_addr->sin_len = sizeof(*pfx_addr);
976 pfx_addr->sin_family = AF_INET;
977 pfx_addr->sin_addr = *prefix;
978 rtalloc_ign_fib(&pfx_ro, 0, 0);
979 if (pfx_ro.ro_rt != NULL) {
980 msg_rt = *pfx_ro.ro_rt;
981
982 /* QL: XXX
983 * Point the gateway to the new interface
984 * address as if a new prefix route entry has
985 * been added through the new address alias.
986 * All other parts of the rtentry is accurate,
987 * e.g., rt_key, rt_mask, rt_ifp etc.
988 */
989 msg_rt.rt_gateway =
990 (struct sockaddr *)&target->ia_addr;
991 rt_newaddrmsg(cmd,
992 (struct ifaddr *)target,
993 0, &msg_rt);
994 RTFREE(pfx_ro.ro_rt);
995 }
996 return;
997 }
998
999 /*
1000 * Check if we have a route for the given prefix already or add one accordingly.
1001 */
1002 static int
1003 in_addprefix(struct in_ifaddr *target, int flags)
1004 {
1005 struct in_ifaddr *ia;
1006 struct in_addr prefix, mask, p, m;
1007 int error;
1008
1009 if ((flags & RTF_HOST) != 0) {
1010 prefix = target->ia_dstaddr.sin_addr;
1011 mask.s_addr = 0;
1012 } else {
1013 prefix = target->ia_addr.sin_addr;
1014 mask = target->ia_sockmask.sin_addr;
1015 prefix.s_addr &= mask.s_addr;
1016 }
1017
1018 IN_IFADDR_RLOCK();
1019 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1020 if (rtinitflags(ia)) {
1021 p = ia->ia_dstaddr.sin_addr;
1022
1023 if (prefix.s_addr != p.s_addr)
1024 continue;
1025 } else {
1026 p = ia->ia_addr.sin_addr;
1027 m = ia->ia_sockmask.sin_addr;
1028 p.s_addr &= m.s_addr;
1029
1030 if (prefix.s_addr != p.s_addr ||
1031 mask.s_addr != m.s_addr)
1032 continue;
1033 }
1034
1035 /*
1036 * If we got a matching prefix route inserted by other
1037 * interface address, we are done here.
1038 */
1039 if (ia->ia_flags & IFA_ROUTE) {
1040 #ifdef RADIX_MPATH
1041 if (ia->ia_addr.sin_addr.s_addr ==
1042 target->ia_addr.sin_addr.s_addr) {
1043 IN_IFADDR_RUNLOCK();
1044 return (EEXIST);
1045 } else
1046 break;
1047 #endif
1048 if (V_sameprefixcarponly &&
1049 target->ia_ifp->if_type != IFT_CARP &&
1050 ia->ia_ifp->if_type != IFT_CARP) {
1051 IN_IFADDR_RUNLOCK();
1052 return (EEXIST);
1053 } else {
1054 in_addralias_rtmsg(RTM_ADD, &prefix, target);
1055 IN_IFADDR_RUNLOCK();
1056 return (0);
1057 }
1058 }
1059 }
1060 IN_IFADDR_RUNLOCK();
1061
1062 /*
1063 * No-one seem to have this prefix route, so we try to insert it.
1064 */
1065 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
1066 if (!error)
1067 target->ia_flags |= IFA_ROUTE;
1068 return (error);
1069 }
1070
1071 extern void arp_ifscrub(struct ifnet *ifp, uint32_t addr);
1072
1073 /*
1074 * If there is no other address in the system that can serve a route to the
1075 * same prefix, remove the route. Hand over the route to the new address
1076 * otherwise.
1077 */
1078 static int
1079 in_scrubprefix(struct in_ifaddr *target, u_int flags)
1080 {
1081 struct in_ifaddr *ia;
1082 struct in_addr prefix, mask, p;
1083 int error = 0;
1084 struct sockaddr_in prefix0, mask0;
1085
1086 /*
1087 * Remove the loopback route to the interface address.
1088 * The "useloopback" setting is not consulted because if the
1089 * user configures an interface address, turns off this
1090 * setting, and then tries to delete that interface address,
1091 * checking the current setting of "useloopback" would leave
1092 * that interface address loopback route untouched, which
1093 * would be wrong. Therefore the interface address loopback route
1094 * deletion is unconditional.
1095 */
1096 if ((target->ia_addr.sin_addr.s_addr != INADDR_ANY) &&
1097 !(target->ia_ifp->if_flags & IFF_LOOPBACK) &&
1098 (target->ia_flags & IFA_RTSELF)) {
1099 struct route ia_ro;
1100 int freeit = 0;
1101
1102 bzero(&ia_ro, sizeof(ia_ro));
1103 *((struct sockaddr_in *)(&ia_ro.ro_dst)) = target->ia_addr;
1104 rtalloc_ign_fib(&ia_ro, 0, 0);
1105 if ((ia_ro.ro_rt != NULL) && (ia_ro.ro_rt->rt_ifp != NULL) &&
1106 (ia_ro.ro_rt->rt_ifp == V_loif)) {
1107 RT_LOCK(ia_ro.ro_rt);
1108 if (ia_ro.ro_rt->rt_refcnt <= 1)
1109 freeit = 1;
1110 else if (flags & LLE_STATIC) {
1111 RT_REMREF(ia_ro.ro_rt);
1112 target->ia_flags &= ~IFA_RTSELF;
1113 }
1114 RTFREE_LOCKED(ia_ro.ro_rt);
1115 }
1116 if (freeit && (flags & LLE_STATIC)) {
1117 error = ifa_del_loopback_route((struct ifaddr *)target,
1118 (struct sockaddr *)&target->ia_addr);
1119 if (error == 0)
1120 target->ia_flags &= ~IFA_RTSELF;
1121 }
1122 if ((flags & LLE_STATIC) &&
1123 !(target->ia_ifp->if_flags & IFF_NOARP))
1124 /* remove arp cache */
1125 arp_ifscrub(target->ia_ifp, IA_SIN(target)->sin_addr.s_addr);
1126 }
1127
1128 if (rtinitflags(target))
1129 prefix = target->ia_dstaddr.sin_addr;
1130 else {
1131 prefix = target->ia_addr.sin_addr;
1132 mask = target->ia_sockmask.sin_addr;
1133 prefix.s_addr &= mask.s_addr;
1134 }
1135
1136 if ((target->ia_flags & IFA_ROUTE) == 0) {
1137 in_addralias_rtmsg(RTM_DELETE, &prefix, target);
1138 return (0);
1139 }
1140
1141 IN_IFADDR_RLOCK();
1142 TAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
1143 if (rtinitflags(ia))
1144 p = ia->ia_dstaddr.sin_addr;
1145 else {
1146 p = ia->ia_addr.sin_addr;
1147 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
1148 }
1149
1150 if ((prefix.s_addr != p.s_addr) ||
1151 !(ia->ia_ifp->if_flags & IFF_UP))
1152 continue;
1153
1154 /*
1155 * If we got a matching prefix address, move IFA_ROUTE and
1156 * the route itself to it. Make sure that routing daemons
1157 * get a heads-up.
1158 *
1159 * XXX: a special case for carp(4) interface - this should
1160 * be more generally specified as an interface that
1161 * doesn't support such action.
1162 */
1163 if ((ia->ia_flags & IFA_ROUTE) == 0
1164 && (ia->ia_ifp->if_type != IFT_CARP)) {
1165 ifa_ref(&ia->ia_ifa);
1166 IN_IFADDR_RUNLOCK();
1167 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE,
1168 rtinitflags(target));
1169 if (error == 0)
1170 target->ia_flags &= ~IFA_ROUTE;
1171 else
1172 log(LOG_INFO, "in_scrubprefix: err=%d, old prefix delete failed\n",
1173 error);
1174 error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
1175 rtinitflags(ia) | RTF_UP);
1176 if (error == 0)
1177 ia->ia_flags |= IFA_ROUTE;
1178 else
1179 log(LOG_INFO, "in_scrubprefix: err=%d, new prefix add failed\n",
1180 error);
1181 ifa_free(&ia->ia_ifa);
1182 return (error);
1183 }
1184 }
1185 IN_IFADDR_RUNLOCK();
1186
1187 /*
1188 * remove all L2 entries on the given prefix
1189 */
1190 bzero(&prefix0, sizeof(prefix0));
1191 prefix0.sin_len = sizeof(prefix0);
1192 prefix0.sin_family = AF_INET;
1193 prefix0.sin_addr.s_addr = target->ia_subnet;
1194 bzero(&mask0, sizeof(mask0));
1195 mask0.sin_len = sizeof(mask0);
1196 mask0.sin_family = AF_INET;
1197 mask0.sin_addr.s_addr = target->ia_subnetmask;
1198 lltable_prefix_free(AF_INET, (struct sockaddr *)&prefix0,
1199 (struct sockaddr *)&mask0, flags);
1200
1201 /*
1202 * As no-one seem to have this prefix, we can remove the route.
1203 */
1204 error = rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
1205 if (error == 0)
1206 target->ia_flags &= ~IFA_ROUTE;
1207 else
1208 log(LOG_INFO, "in_scrubprefix: err=%d, prefix delete failed\n", error);
1209 return (error);
1210 }
1211
1212 #undef rtinitflags
1213
1214 /*
1215 * Return 1 if the address might be a local broadcast address.
1216 */
1217 int
1218 in_broadcast(struct in_addr in, struct ifnet *ifp)
1219 {
1220 register struct ifaddr *ifa;
1221 u_long t;
1222
1223 if (in.s_addr == INADDR_BROADCAST ||
1224 in.s_addr == INADDR_ANY)
1225 return (1);
1226 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1227 return (0);
1228 t = ntohl(in.s_addr);
1229 /*
1230 * Look through the list of addresses for a match
1231 * with a broadcast address.
1232 */
1233 #define ia ((struct in_ifaddr *)ifa)
1234 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
1235 if (ifa->ifa_addr->sa_family == AF_INET &&
1236 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1237 /*
1238 * Check for old-style (host 0) broadcast, but
1239 * taking into account that RFC 3021 obsoletes it.
1240 */
1241 (ia->ia_subnetmask != IN_RFC3021_MASK &&
1242 t == ia->ia_subnet)) &&
1243 /*
1244 * Check for an all one subnetmask. These
1245 * only exist when an interface gets a secondary
1246 * address.
1247 */
1248 ia->ia_subnetmask != (u_long)0xffffffff)
1249 return (1);
1250 return (0);
1251 #undef ia
1252 }
1253
1254 /*
1255 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1256 */
1257 void
1258 in_ifdetach(struct ifnet *ifp)
1259 {
1260
1261 in_pcbpurgeif0(&V_ripcbinfo, ifp);
1262 in_pcbpurgeif0(&V_udbinfo, ifp);
1263 in_purgemaddrs(ifp);
1264 }
1265
1266 /*
1267 * Delete all IPv4 multicast address records, and associated link-layer
1268 * multicast address records, associated with ifp.
1269 * XXX It looks like domifdetach runs AFTER the link layer cleanup.
1270 * XXX This should not race with ifma_protospec being set during
1271 * a new allocation, if it does, we have bigger problems.
1272 */
1273 static void
1274 in_purgemaddrs(struct ifnet *ifp)
1275 {
1276 LIST_HEAD(,in_multi) purgeinms;
1277 struct in_multi *inm, *tinm;
1278 struct ifmultiaddr *ifma;
1279
1280 LIST_INIT(&purgeinms);
1281 IN_MULTI_LOCK();
1282
1283 /*
1284 * Extract list of in_multi associated with the detaching ifp
1285 * which the PF_INET layer is about to release.
1286 * We need to do this as IF_ADDR_LOCK() may be re-acquired
1287 * by code further down.
1288 */
1289 IF_ADDR_LOCK(ifp);
1290 TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
1291 if (ifma->ifma_addr->sa_family != AF_INET ||
1292 ifma->ifma_protospec == NULL)
1293 continue;
1294 #if 0
1295 KASSERT(ifma->ifma_protospec != NULL,
1296 ("%s: ifma_protospec is NULL", __func__));
1297 #endif
1298 inm = (struct in_multi *)ifma->ifma_protospec;
1299 LIST_INSERT_HEAD(&purgeinms, inm, inm_link);
1300 }
1301 IF_ADDR_UNLOCK(ifp);
1302
1303 LIST_FOREACH_SAFE(inm, &purgeinms, inm_link, tinm) {
1304 LIST_REMOVE(inm, inm_link);
1305 inm_release_locked(inm);
1306 }
1307 igmp_ifdetach(ifp);
1308
1309 IN_MULTI_UNLOCK();
1310 }
1311
1312 #include <net/if_dl.h>
1313 #include <netinet/if_ether.h>
1314
1315 struct in_llentry {
1316 struct llentry base;
1317 struct sockaddr_in l3_addr4;
1318 };
1319
1320 static struct llentry *
1321 in_lltable_new(const struct sockaddr *l3addr, u_int flags)
1322 {
1323 struct in_llentry *lle;
1324
1325 lle = malloc(sizeof(struct in_llentry), M_LLTABLE, M_DONTWAIT | M_ZERO);
1326 if (lle == NULL) /* NB: caller generates msg */
1327 return NULL;
1328
1329 callout_init(&lle->base.la_timer, CALLOUT_MPSAFE);
1330 /*
1331 * For IPv4 this will trigger "arpresolve" to generate
1332 * an ARP request.
1333 */
1334 lle->base.la_expire = time_uptime; /* mark expired */
1335 lle->l3_addr4 = *(const struct sockaddr_in *)l3addr;
1336 lle->base.lle_refcnt = 1;
1337 LLE_LOCK_INIT(&lle->base);
1338 return &lle->base;
1339 }
1340
1341 /*
1342 * Deletes an address from the address table.
1343 * This function is called by the timer functions
1344 * such as arptimer() and nd6_llinfo_timer(), and
1345 * the caller does the locking.
1346 */
1347 static void
1348 in_lltable_free(struct lltable *llt, struct llentry *lle)
1349 {
1350 LLE_WUNLOCK(lle);
1351 LLE_LOCK_DESTROY(lle);
1352 free(lle, M_LLTABLE);
1353 }
1354
1355
1356 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
1357 (((ntohl((d)->sin_addr.s_addr) ^ (a)->sin_addr.s_addr) & (m)->sin_addr.s_addr)) == 0 )
1358
1359 static void
1360 in_lltable_prefix_free(struct lltable *llt,
1361 const struct sockaddr *prefix,
1362 const struct sockaddr *mask,
1363 u_int flags)
1364 {
1365 const struct sockaddr_in *pfx = (const struct sockaddr_in *)prefix;
1366 const struct sockaddr_in *msk = (const struct sockaddr_in *)mask;
1367 struct llentry *lle, *next;
1368 register int i;
1369 size_t pkts_dropped;
1370
1371 for (i=0; i < LLTBL_HASHTBL_SIZE; i++) {
1372 LIST_FOREACH_SAFE(lle, &llt->lle_head[i], lle_next, next) {
1373
1374 /*
1375 * (flags & LLE_STATIC) means deleting all entries
1376 * including static ARP entries
1377 */
1378 if (IN_ARE_MASKED_ADDR_EQUAL((struct sockaddr_in *)L3_ADDR(lle),
1379 pfx, msk) &&
1380 ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))) {
1381 int canceled;
1382
1383 canceled = callout_drain(&lle->la_timer);
1384 LLE_WLOCK(lle);
1385 if (canceled)
1386 LLE_REMREF(lle);
1387 pkts_dropped = llentry_free(lle);
1388 ARPSTAT_ADD(dropped, pkts_dropped);
1389 }
1390 }
1391 }
1392 }
1393
1394
1395 static int
1396 in_lltable_rtcheck(struct ifnet *ifp, u_int flags, const struct sockaddr *l3addr)
1397 {
1398 struct rtentry *rt;
1399
1400 KASSERT(l3addr->sa_family == AF_INET,
1401 ("sin_family %d", l3addr->sa_family));
1402
1403 /* XXX rtalloc1 should take a const param */
1404 rt = rtalloc1(__DECONST(struct sockaddr *, l3addr), 0, 0);
1405
1406 if (rt == NULL)
1407 return (EINVAL);
1408
1409 /*
1410 * If the gateway for an existing host route matches the target L3
1411 * address, which is a special route inserted by some implementation
1412 * such as MANET, and the interface is of the correct type, then
1413 * allow for ARP to proceed.
1414 */
1415 if (rt->rt_flags & RTF_GATEWAY) {
1416 if (!(rt->rt_flags & RTF_HOST) || !rt->rt_ifp ||
1417 rt->rt_ifp->if_type != IFT_ETHER ||
1418 (rt->rt_ifp->if_flags &
1419 (IFF_NOARP | IFF_STATICARP)) != 0 ||
1420 memcmp(rt->rt_gateway->sa_data, l3addr->sa_data,
1421 sizeof(in_addr_t)) != 0) {
1422 RTFREE_LOCKED(rt);
1423 return (EINVAL);
1424 }
1425 }
1426
1427 /*
1428 * Make sure that at least the destination address is covered
1429 * by the route. This is for handling the case where 2 or more
1430 * interfaces have the same prefix. An incoming packet arrives
1431 * on one interface and the corresponding outgoing packet leaves
1432 * another interface.
1433 */
1434 if (!(rt->rt_flags & RTF_HOST) && rt->rt_ifp != ifp) {
1435 const char *sa, *mask, *addr, *lim;
1436 int len;
1437
1438 mask = (const char *)rt_mask(rt);
1439 /*
1440 * Just being extra cautious to avoid some custom
1441 * code getting into trouble.
1442 */
1443 if (mask == NULL) {
1444 RTFREE_LOCKED(rt);
1445 return (EINVAL);
1446 }
1447
1448 sa = (const char *)rt_key(rt);
1449 addr = (const char *)l3addr;
1450 len = ((const struct sockaddr_in *)l3addr)->sin_len;
1451 lim = addr + len;
1452
1453 for ( ; addr < lim; sa++, mask++, addr++) {
1454 if ((*sa ^ *addr) & *mask) {
1455 #ifdef DIAGNOSTIC
1456 log(LOG_INFO, "IPv4 address: \"%s\" is not on the network\n",
1457 inet_ntoa(((const struct sockaddr_in *)l3addr)->sin_addr));
1458 #endif
1459 RTFREE_LOCKED(rt);
1460 return (EINVAL);
1461 }
1462 }
1463 }
1464
1465 RTFREE_LOCKED(rt);
1466 return (0);
1467 }
1468
1469 /*
1470 * Return NULL if not found or marked for deletion.
1471 * If found return lle read locked.
1472 */
1473 static struct llentry *
1474 in_lltable_lookup(struct lltable *llt, u_int flags, const struct sockaddr *l3addr)
1475 {
1476 const struct sockaddr_in *sin = (const struct sockaddr_in *)l3addr;
1477 struct ifnet *ifp = llt->llt_ifp;
1478 struct llentry *lle;
1479 struct llentries *lleh;
1480 u_int hashkey;
1481
1482 IF_AFDATA_LOCK_ASSERT(ifp);
1483 KASSERT(l3addr->sa_family == AF_INET,
1484 ("sin_family %d", l3addr->sa_family));
1485
1486 hashkey = sin->sin_addr.s_addr;
1487 lleh = &llt->lle_head[LLATBL_HASH(hashkey, LLTBL_HASHMASK)];
1488 LIST_FOREACH(lle, lleh, lle_next) {
1489 struct sockaddr_in *sa2 = (struct sockaddr_in *)L3_ADDR(lle);
1490 if (lle->la_flags & LLE_DELETED)
1491 continue;
1492 if (sa2->sin_addr.s_addr == sin->sin_addr.s_addr)
1493 break;
1494 }
1495 if (lle == NULL) {
1496 #ifdef DIAGNOSTIC
1497 if (flags & LLE_DELETE)
1498 log(LOG_INFO, "interface address is missing from cache = %p in delete\n", lle);
1499 #endif
1500 if (!(flags & LLE_CREATE))
1501 return (NULL);
1502 /*
1503 * A route that covers the given address must have
1504 * been installed 1st because we are doing a resolution,
1505 * verify this.
1506 */
1507 if (!(flags & LLE_IFADDR) &&
1508 in_lltable_rtcheck(ifp, flags, l3addr) != 0)
1509 goto done;
1510
1511 lle = in_lltable_new(l3addr, flags);
1512 if (lle == NULL) {
1513 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
1514 goto done;
1515 }
1516 lle->la_flags = flags & ~LLE_CREATE;
1517 if ((flags & (LLE_CREATE | LLE_IFADDR)) == (LLE_CREATE | LLE_IFADDR)) {
1518 bcopy(IF_LLADDR(ifp), &lle->ll_addr, ifp->if_addrlen);
1519 lle->la_flags |= (LLE_VALID | LLE_STATIC);
1520 }
1521
1522 lle->lle_tbl = llt;
1523 lle->lle_head = lleh;
1524 LIST_INSERT_HEAD(lleh, lle, lle_next);
1525 } else if (flags & LLE_DELETE) {
1526 if (!(lle->la_flags & LLE_IFADDR) || (flags & LLE_IFADDR)) {
1527 LLE_WLOCK(lle);
1528 lle->la_flags = LLE_DELETED;
1529 EVENTHANDLER_INVOKE(arp_update_event, lle);
1530 LLE_WUNLOCK(lle);
1531 #ifdef DIAGNOSTIC
1532 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
1533 #endif
1534 }
1535 lle = (void *)-1;
1536
1537 }
1538 if (LLE_IS_VALID(lle)) {
1539 if (flags & LLE_EXCLUSIVE)
1540 LLE_WLOCK(lle);
1541 else
1542 LLE_RLOCK(lle);
1543 }
1544 done:
1545 return (lle);
1546 }
1547
1548 static int
1549 in_lltable_dump(struct lltable *llt, struct sysctl_req *wr)
1550 {
1551 #define SIN(lle) ((struct sockaddr_in *) L3_ADDR(lle))
1552 struct ifnet *ifp = llt->llt_ifp;
1553 struct llentry *lle;
1554 /* XXX stack use */
1555 struct {
1556 struct rt_msghdr rtm;
1557 struct sockaddr_inarp sin;
1558 struct sockaddr_dl sdl;
1559 } arpc;
1560 int error, i;
1561
1562 LLTABLE_LOCK_ASSERT();
1563
1564 error = 0;
1565 for (i = 0; i < LLTBL_HASHTBL_SIZE; i++) {
1566 LIST_FOREACH(lle, &llt->lle_head[i], lle_next) {
1567 struct sockaddr_dl *sdl;
1568
1569 /* skip deleted entries */
1570 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
1571 continue;
1572 /* Skip if jailed and not a valid IP of the prison. */
1573 if (prison_if(wr->td->td_ucred, L3_ADDR(lle)) != 0)
1574 continue;
1575 /*
1576 * produce a msg made of:
1577 * struct rt_msghdr;
1578 * struct sockaddr_inarp; (IPv4)
1579 * struct sockaddr_dl;
1580 */
1581 bzero(&arpc, sizeof(arpc));
1582 arpc.rtm.rtm_msglen = sizeof(arpc);
1583 arpc.rtm.rtm_version = RTM_VERSION;
1584 arpc.rtm.rtm_type = RTM_GET;
1585 arpc.rtm.rtm_flags = RTF_UP;
1586 arpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
1587 arpc.sin.sin_family = AF_INET;
1588 arpc.sin.sin_len = sizeof(arpc.sin);
1589 arpc.sin.sin_addr.s_addr = SIN(lle)->sin_addr.s_addr;
1590
1591 /* publish */
1592 if (lle->la_flags & LLE_PUB) {
1593 arpc.rtm.rtm_flags |= RTF_ANNOUNCE;
1594 /* proxy only */
1595 if (lle->la_flags & LLE_PROXY)
1596 arpc.sin.sin_other = SIN_PROXY;
1597 }
1598
1599 sdl = &arpc.sdl;
1600 sdl->sdl_family = AF_LINK;
1601 sdl->sdl_len = sizeof(*sdl);
1602 sdl->sdl_index = ifp->if_index;
1603 sdl->sdl_type = ifp->if_type;
1604 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
1605 sdl->sdl_alen = ifp->if_addrlen;
1606 bcopy(&lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
1607 } else {
1608 sdl->sdl_alen = 0;
1609 bzero(LLADDR(sdl), ifp->if_addrlen);
1610 }
1611
1612 arpc.rtm.rtm_rmx.rmx_expire =
1613 lle->la_flags & LLE_STATIC ? 0 : lle->la_expire;
1614 arpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
1615 if (lle->la_flags & LLE_STATIC)
1616 arpc.rtm.rtm_flags |= RTF_STATIC;
1617 arpc.rtm.rtm_index = ifp->if_index;
1618 error = SYSCTL_OUT(wr, &arpc, sizeof(arpc));
1619 if (error)
1620 break;
1621 }
1622 }
1623 return error;
1624 #undef SIN
1625 }
1626
1627 void *
1628 in_domifattach(struct ifnet *ifp)
1629 {
1630 struct in_ifinfo *ii;
1631 struct lltable *llt;
1632
1633 ii = malloc(sizeof(struct in_ifinfo), M_IFADDR, M_WAITOK|M_ZERO);
1634
1635 llt = lltable_init(ifp, AF_INET);
1636 if (llt != NULL) {
1637 llt->llt_free = in_lltable_free;
1638 llt->llt_prefix_free = in_lltable_prefix_free;
1639 llt->llt_lookup = in_lltable_lookup;
1640 llt->llt_dump = in_lltable_dump;
1641 }
1642 ii->ii_llt = llt;
1643
1644 ii->ii_igmp = igmp_domifattach(ifp);
1645
1646 return ii;
1647 }
1648
1649 void
1650 in_domifdetach(struct ifnet *ifp, void *aux)
1651 {
1652 struct in_ifinfo *ii = (struct in_ifinfo *)aux;
1653
1654 igmp_domifdetach(ifp);
1655 lltable_free(ii->ii_llt);
1656 free(ii, M_IFADDR);
1657 }
Cache object: 6b2a3cfd228cd0cda984ddbe4eca4acc
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