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 * $FreeBSD: releng/6.1/sys/netinet/in.c 155109 2006-01-31 16:11:37Z andre $
32 */
33
34 #include "opt_carp.h"
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/sockio.h>
39 #include <sys/malloc.h>
40 #include <sys/socket.h>
41 #include <sys/kernel.h>
42 #include <sys/sysctl.h>
43
44 #include <net/if.h>
45 #include <net/if_types.h>
46 #include <net/route.h>
47
48 #include <netinet/in.h>
49 #include <netinet/in_var.h>
50 #include <netinet/in_pcb.h>
51
52 #include <netinet/igmp_var.h>
53
54 static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
55
56 static int in_mask2len(struct in_addr *);
57 static void in_len2mask(struct in_addr *, int);
58 static int in_lifaddr_ioctl(struct socket *, u_long, caddr_t,
59 struct ifnet *, struct thread *);
60
61 static int in_addprefix(struct in_ifaddr *, int);
62 static int in_scrubprefix(struct in_ifaddr *);
63 static void in_socktrim(struct sockaddr_in *);
64 static int in_ifinit(struct ifnet *,
65 struct in_ifaddr *, struct sockaddr_in *, int);
66
67 static int subnetsarelocal = 0;
68 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
69 &subnetsarelocal, 0, "Treat all subnets as directly connected");
70 static int sameprefixcarponly = 0;
71 SYSCTL_INT(_net_inet_ip, OID_AUTO, same_prefix_carp_only, CTLFLAG_RW,
72 &sameprefixcarponly, 0,
73 "Refuse to create same prefixes on different interfaces");
74
75 /*
76 * The IPv4 multicast list (in_multihead and associated structures) are
77 * protected by the global in_multi_mtx. See in_var.h for more details. For
78 * now, in_multi_mtx is marked as recursible due to IGMP's calling back into
79 * ip_output() to send IGMP packets while holding the lock; this probably is
80 * not quite desirable.
81 */
82 struct in_multihead in_multihead; /* XXX BSS initialization */
83 struct mtx in_multi_mtx;
84 MTX_SYSINIT(in_multi_mtx, &in_multi_mtx, "in_multi_mtx", MTX_DEF | MTX_RECURSE);
85
86 extern struct inpcbinfo ripcbinfo;
87 extern struct inpcbinfo udbinfo;
88
89 /*
90 * Return 1 if an internet address is for a ``local'' host
91 * (one to which we have a connection). If subnetsarelocal
92 * is true, this includes other subnets of the local net.
93 * Otherwise, it includes only the directly-connected (sub)nets.
94 */
95 int
96 in_localaddr(in)
97 struct in_addr in;
98 {
99 register u_long i = ntohl(in.s_addr);
100 register struct in_ifaddr *ia;
101
102 if (subnetsarelocal) {
103 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
104 if ((i & ia->ia_netmask) == ia->ia_net)
105 return (1);
106 } else {
107 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
108 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
109 return (1);
110 }
111 return (0);
112 }
113
114 /*
115 * Return 1 if an internet address is for the local host and configured
116 * on one of its interfaces.
117 */
118 int
119 in_localip(in)
120 struct in_addr in;
121 {
122 struct in_ifaddr *ia;
123
124 LIST_FOREACH(ia, INADDR_HASH(in.s_addr), ia_hash) {
125 if (IA_SIN(ia)->sin_addr.s_addr == in.s_addr)
126 return 1;
127 }
128 return 0;
129 }
130
131 /*
132 * Determine whether an IP address is in a reserved set of addresses
133 * that may not be forwarded, or whether datagrams to that destination
134 * may be forwarded.
135 */
136 int
137 in_canforward(in)
138 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))
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(ap)
158 struct sockaddr_in *ap;
159 {
160 register char *cplim = (char *) &ap->sin_addr;
161 register char *cp = (char *) (&ap->sin_addr + 1);
162
163 ap->sin_len = 0;
164 while (--cp >= cplim)
165 if (*cp) {
166 (ap)->sin_len = cp - (char *) (ap) + 1;
167 break;
168 }
169 }
170
171 static int
172 in_mask2len(mask)
173 struct in_addr *mask;
174 {
175 int x, y;
176 u_char *p;
177
178 p = (u_char *)mask;
179 for (x = 0; x < sizeof(*mask); x++) {
180 if (p[x] != 0xff)
181 break;
182 }
183 y = 0;
184 if (x < sizeof(*mask)) {
185 for (y = 0; y < 8; y++) {
186 if ((p[x] & (0x80 >> y)) == 0)
187 break;
188 }
189 }
190 return x * 8 + y;
191 }
192
193 static void
194 in_len2mask(mask, len)
195 struct in_addr *mask;
196 int len;
197 {
198 int i;
199 u_char *p;
200
201 p = (u_char *)mask;
202 bzero(mask, sizeof(*mask));
203 for (i = 0; i < len / 8; i++)
204 p[i] = 0xff;
205 if (len % 8)
206 p[i] = (0xff00 >> (len % 8)) & 0xff;
207 }
208
209 /*
210 * Generic internet control operations (ioctl's).
211 * Ifp is 0 if not an interface-specific ioctl.
212 */
213 /* ARGSUSED */
214 int
215 in_control(so, cmd, data, ifp, td)
216 struct socket *so;
217 u_long cmd;
218 caddr_t data;
219 register struct ifnet *ifp;
220 struct thread *td;
221 {
222 register struct ifreq *ifr = (struct ifreq *)data;
223 register struct in_ifaddr *ia = 0, *iap;
224 register struct ifaddr *ifa;
225 struct in_addr dst;
226 struct in_ifaddr *oia;
227 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
228 struct sockaddr_in oldaddr;
229 int error, hostIsNew, iaIsNew, maskIsNew, s;
230
231 iaIsNew = 0;
232
233 switch (cmd) {
234 case SIOCALIFADDR:
235 case SIOCDLIFADDR:
236 if (td && (error = suser(td)) != 0)
237 return error;
238 /*fall through*/
239 case SIOCGLIFADDR:
240 if (!ifp)
241 return EINVAL;
242 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
243 }
244
245 /*
246 * Find address for this interface, if it exists.
247 *
248 * If an alias address was specified, find that one instead of
249 * the first one on the interface, if possible.
250 */
251 if (ifp) {
252 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
253 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash)
254 if (iap->ia_ifp == ifp &&
255 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
256 ia = iap;
257 break;
258 }
259 if (ia == NULL)
260 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
261 iap = ifatoia(ifa);
262 if (iap->ia_addr.sin_family == AF_INET) {
263 ia = iap;
264 break;
265 }
266 }
267 }
268
269 switch (cmd) {
270
271 case SIOCAIFADDR:
272 case SIOCDIFADDR:
273 if (ifp == 0)
274 return (EADDRNOTAVAIL);
275 if (ifra->ifra_addr.sin_family == AF_INET) {
276 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
277 if (ia->ia_ifp == ifp &&
278 ia->ia_addr.sin_addr.s_addr ==
279 ifra->ifra_addr.sin_addr.s_addr)
280 break;
281 }
282 if ((ifp->if_flags & IFF_POINTOPOINT)
283 && (cmd == SIOCAIFADDR)
284 && (ifra->ifra_dstaddr.sin_addr.s_addr
285 == INADDR_ANY)) {
286 return EDESTADDRREQ;
287 }
288 }
289 if (cmd == SIOCDIFADDR && ia == 0)
290 return (EADDRNOTAVAIL);
291 /* FALLTHROUGH */
292 case SIOCSIFADDR:
293 case SIOCSIFNETMASK:
294 case SIOCSIFDSTADDR:
295 if (td && (error = suser(td)) != 0)
296 return error;
297
298 if (ifp == 0)
299 return (EADDRNOTAVAIL);
300 if (ia == (struct in_ifaddr *)0) {
301 ia = (struct in_ifaddr *)
302 malloc(sizeof *ia, M_IFADDR, M_WAITOK | M_ZERO);
303 if (ia == (struct in_ifaddr *)NULL)
304 return (ENOBUFS);
305 /*
306 * Protect from ipintr() traversing address list
307 * while we're modifying it.
308 */
309 s = splnet();
310 ifa = &ia->ia_ifa;
311 IFA_LOCK_INIT(ifa);
312 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
313 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
314 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
315 ifa->ifa_refcnt = 1;
316 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
317
318 ia->ia_sockmask.sin_len = 8;
319 ia->ia_sockmask.sin_family = AF_INET;
320 if (ifp->if_flags & IFF_BROADCAST) {
321 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
322 ia->ia_broadaddr.sin_family = AF_INET;
323 }
324 ia->ia_ifp = ifp;
325
326 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
327 splx(s);
328 iaIsNew = 1;
329 }
330 break;
331
332 case SIOCSIFBRDADDR:
333 if (td && (error = suser(td)) != 0)
334 return error;
335 /* FALLTHROUGH */
336
337 case SIOCGIFADDR:
338 case SIOCGIFNETMASK:
339 case SIOCGIFDSTADDR:
340 case SIOCGIFBRDADDR:
341 if (ia == (struct in_ifaddr *)0)
342 return (EADDRNOTAVAIL);
343 break;
344 }
345 switch (cmd) {
346
347 case SIOCGIFADDR:
348 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
349 return (0);
350
351 case SIOCGIFBRDADDR:
352 if ((ifp->if_flags & IFF_BROADCAST) == 0)
353 return (EINVAL);
354 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
355 return (0);
356
357 case SIOCGIFDSTADDR:
358 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
359 return (EINVAL);
360 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
361 return (0);
362
363 case SIOCGIFNETMASK:
364 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
365 return (0);
366
367 case SIOCSIFDSTADDR:
368 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
369 return (EINVAL);
370 oldaddr = ia->ia_dstaddr;
371 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
372 if (ifp->if_ioctl) {
373 IFF_LOCKGIANT(ifp);
374 error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR,
375 (caddr_t)ia);
376 IFF_UNLOCKGIANT(ifp);
377 if (error) {
378 ia->ia_dstaddr = oldaddr;
379 return (error);
380 }
381 }
382 if (ia->ia_flags & IFA_ROUTE) {
383 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
384 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
385 ia->ia_ifa.ifa_dstaddr =
386 (struct sockaddr *)&ia->ia_dstaddr;
387 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
388 }
389 return (0);
390
391 case SIOCSIFBRDADDR:
392 if ((ifp->if_flags & IFF_BROADCAST) == 0)
393 return (EINVAL);
394 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
395 return (0);
396
397 case SIOCSIFADDR:
398 error = in_ifinit(ifp, ia,
399 (struct sockaddr_in *) &ifr->ifr_addr, 1);
400 if (error != 0 && iaIsNew)
401 break;
402 if (error == 0)
403 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
404 return (0);
405
406 case SIOCSIFNETMASK:
407 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
408 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
409 return (0);
410
411 case SIOCAIFADDR:
412 maskIsNew = 0;
413 hostIsNew = 1;
414 error = 0;
415 if (ia->ia_addr.sin_family == AF_INET) {
416 if (ifra->ifra_addr.sin_len == 0) {
417 ifra->ifra_addr = ia->ia_addr;
418 hostIsNew = 0;
419 } else if (ifra->ifra_addr.sin_addr.s_addr ==
420 ia->ia_addr.sin_addr.s_addr)
421 hostIsNew = 0;
422 }
423 if (ifra->ifra_mask.sin_len) {
424 in_ifscrub(ifp, ia);
425 ia->ia_sockmask = ifra->ifra_mask;
426 ia->ia_sockmask.sin_family = AF_INET;
427 ia->ia_subnetmask =
428 ntohl(ia->ia_sockmask.sin_addr.s_addr);
429 maskIsNew = 1;
430 }
431 if ((ifp->if_flags & IFF_POINTOPOINT) &&
432 (ifra->ifra_dstaddr.sin_family == AF_INET)) {
433 in_ifscrub(ifp, ia);
434 ia->ia_dstaddr = ifra->ifra_dstaddr;
435 maskIsNew = 1; /* We lie; but the effect's the same */
436 }
437 if (ifra->ifra_addr.sin_family == AF_INET &&
438 (hostIsNew || maskIsNew))
439 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
440 if (error != 0 && iaIsNew)
441 break;
442
443 if ((ifp->if_flags & IFF_BROADCAST) &&
444 (ifra->ifra_broadaddr.sin_family == AF_INET))
445 ia->ia_broadaddr = ifra->ifra_broadaddr;
446 if (error == 0)
447 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
448 return (error);
449
450 case SIOCDIFADDR:
451 /*
452 * in_ifscrub kills the interface route.
453 */
454 in_ifscrub(ifp, ia);
455 /*
456 * in_ifadown gets rid of all the rest of
457 * the routes. This is not quite the right
458 * thing to do, but at least if we are running
459 * a routing process they will come back.
460 */
461 in_ifadown(&ia->ia_ifa, 1);
462 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
463 error = 0;
464 break;
465
466 default:
467 if (ifp == 0 || ifp->if_ioctl == 0)
468 return (EOPNOTSUPP);
469 IFF_LOCKGIANT(ifp);
470 error = (*ifp->if_ioctl)(ifp, cmd, data);
471 IFF_UNLOCKGIANT(ifp);
472 return (error);
473 }
474
475 /*
476 * Protect from ipintr() traversing address list while we're modifying
477 * it.
478 */
479 s = splnet();
480 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
481 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link);
482 if (ia->ia_addr.sin_family == AF_INET)
483 LIST_REMOVE(ia, ia_hash);
484 IFAFREE(&ia->ia_ifa);
485 splx(s);
486
487 return (error);
488 }
489
490 /*
491 * SIOC[GAD]LIFADDR.
492 * SIOCGLIFADDR: get first address. (?!?)
493 * SIOCGLIFADDR with IFLR_PREFIX:
494 * get first address that matches the specified prefix.
495 * SIOCALIFADDR: add the specified address.
496 * SIOCALIFADDR with IFLR_PREFIX:
497 * EINVAL since we can't deduce hostid part of the address.
498 * SIOCDLIFADDR: delete the specified address.
499 * SIOCDLIFADDR with IFLR_PREFIX:
500 * delete the first address that matches the specified prefix.
501 * return values:
502 * EINVAL on invalid parameters
503 * EADDRNOTAVAIL on prefix match failed/specified address not found
504 * other values may be returned from in_ioctl()
505 */
506 static int
507 in_lifaddr_ioctl(so, cmd, data, ifp, td)
508 struct socket *so;
509 u_long cmd;
510 caddr_t data;
511 struct ifnet *ifp;
512 struct thread *td;
513 {
514 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
515 struct ifaddr *ifa;
516
517 /* sanity checks */
518 if (!data || !ifp) {
519 panic("invalid argument to in_lifaddr_ioctl");
520 /*NOTRECHED*/
521 }
522
523 switch (cmd) {
524 case SIOCGLIFADDR:
525 /* address must be specified on GET with IFLR_PREFIX */
526 if ((iflr->flags & IFLR_PREFIX) == 0)
527 break;
528 /*FALLTHROUGH*/
529 case SIOCALIFADDR:
530 case SIOCDLIFADDR:
531 /* address must be specified on ADD and DELETE */
532 if (iflr->addr.ss_family != AF_INET)
533 return EINVAL;
534 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
535 return EINVAL;
536 /* XXX need improvement */
537 if (iflr->dstaddr.ss_family
538 && iflr->dstaddr.ss_family != AF_INET)
539 return EINVAL;
540 if (iflr->dstaddr.ss_family
541 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
542 return EINVAL;
543 break;
544 default: /*shouldn't happen*/
545 return EOPNOTSUPP;
546 }
547 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
548 return EINVAL;
549
550 switch (cmd) {
551 case SIOCALIFADDR:
552 {
553 struct in_aliasreq ifra;
554
555 if (iflr->flags & IFLR_PREFIX)
556 return EINVAL;
557
558 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
559 bzero(&ifra, sizeof(ifra));
560 bcopy(iflr->iflr_name, ifra.ifra_name,
561 sizeof(ifra.ifra_name));
562
563 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
564
565 if (iflr->dstaddr.ss_family) { /*XXX*/
566 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
567 iflr->dstaddr.ss_len);
568 }
569
570 ifra.ifra_mask.sin_family = AF_INET;
571 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
572 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
573
574 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
575 }
576 case SIOCGLIFADDR:
577 case SIOCDLIFADDR:
578 {
579 struct in_ifaddr *ia;
580 struct in_addr mask, candidate, match;
581 struct sockaddr_in *sin;
582 int cmp;
583
584 bzero(&mask, sizeof(mask));
585 if (iflr->flags & IFLR_PREFIX) {
586 /* lookup a prefix rather than address. */
587 in_len2mask(&mask, iflr->prefixlen);
588
589 sin = (struct sockaddr_in *)&iflr->addr;
590 match.s_addr = sin->sin_addr.s_addr;
591 match.s_addr &= mask.s_addr;
592
593 /* if you set extra bits, that's wrong */
594 if (match.s_addr != sin->sin_addr.s_addr)
595 return EINVAL;
596
597 cmp = 1;
598 } else {
599 if (cmd == SIOCGLIFADDR) {
600 /* on getting an address, take the 1st match */
601 cmp = 0; /*XXX*/
602 } else {
603 /* on deleting an address, do exact match */
604 in_len2mask(&mask, 32);
605 sin = (struct sockaddr_in *)&iflr->addr;
606 match.s_addr = sin->sin_addr.s_addr;
607
608 cmp = 1;
609 }
610 }
611
612 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
613 if (ifa->ifa_addr->sa_family != AF_INET6)
614 continue;
615 if (!cmp)
616 break;
617 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
618 candidate.s_addr &= mask.s_addr;
619 if (candidate.s_addr == match.s_addr)
620 break;
621 }
622 if (!ifa)
623 return EADDRNOTAVAIL;
624 ia = (struct in_ifaddr *)ifa;
625
626 if (cmd == SIOCGLIFADDR) {
627 /* fill in the if_laddrreq structure */
628 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
629
630 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
631 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
632 ia->ia_dstaddr.sin_len);
633 } else
634 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
635
636 iflr->prefixlen =
637 in_mask2len(&ia->ia_sockmask.sin_addr);
638
639 iflr->flags = 0; /*XXX*/
640
641 return 0;
642 } else {
643 struct in_aliasreq ifra;
644
645 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
646 bzero(&ifra, sizeof(ifra));
647 bcopy(iflr->iflr_name, ifra.ifra_name,
648 sizeof(ifra.ifra_name));
649
650 bcopy(&ia->ia_addr, &ifra.ifra_addr,
651 ia->ia_addr.sin_len);
652 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
653 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
654 ia->ia_dstaddr.sin_len);
655 }
656 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
657 ia->ia_sockmask.sin_len);
658
659 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
660 ifp, td);
661 }
662 }
663 }
664
665 return EOPNOTSUPP; /*just for safety*/
666 }
667
668 /*
669 * Delete any existing route for an interface.
670 */
671 void
672 in_ifscrub(ifp, ia)
673 register struct ifnet *ifp;
674 register struct in_ifaddr *ia;
675 {
676 in_scrubprefix(ia);
677 }
678
679 /*
680 * Initialize an interface's internet address
681 * and routing table entry.
682 */
683 static int
684 in_ifinit(ifp, ia, sin, scrub)
685 register struct ifnet *ifp;
686 register struct in_ifaddr *ia;
687 struct sockaddr_in *sin;
688 int scrub;
689 {
690 register u_long i = ntohl(sin->sin_addr.s_addr);
691 struct sockaddr_in oldaddr;
692 int s = splimp(), flags = RTF_UP, error = 0;
693
694 oldaddr = ia->ia_addr;
695 if (oldaddr.sin_family == AF_INET)
696 LIST_REMOVE(ia, ia_hash);
697 ia->ia_addr = *sin;
698 if (ia->ia_addr.sin_family == AF_INET)
699 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
700 ia, ia_hash);
701 /*
702 * Give the interface a chance to initialize
703 * if this is its first address,
704 * and to validate the address if necessary.
705 */
706 if (ifp->if_ioctl) {
707 IFF_LOCKGIANT(ifp);
708 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
709 IFF_UNLOCKGIANT(ifp);
710 if (error) {
711 splx(s);
712 /* LIST_REMOVE(ia, ia_hash) is done in in_control */
713 ia->ia_addr = oldaddr;
714 if (ia->ia_addr.sin_family == AF_INET)
715 LIST_INSERT_HEAD(INADDR_HASH(
716 ia->ia_addr.sin_addr.s_addr), ia, ia_hash);
717 return (error);
718 }
719 }
720 splx(s);
721 if (scrub) {
722 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
723 in_ifscrub(ifp, ia);
724 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
725 }
726 if (IN_CLASSA(i))
727 ia->ia_netmask = IN_CLASSA_NET;
728 else if (IN_CLASSB(i))
729 ia->ia_netmask = IN_CLASSB_NET;
730 else
731 ia->ia_netmask = IN_CLASSC_NET;
732 /*
733 * The subnet mask usually includes at least the standard network part,
734 * but may may be smaller in the case of supernetting.
735 * If it is set, we believe it.
736 */
737 if (ia->ia_subnetmask == 0) {
738 ia->ia_subnetmask = ia->ia_netmask;
739 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
740 } else
741 ia->ia_netmask &= ia->ia_subnetmask;
742 ia->ia_net = i & ia->ia_netmask;
743 ia->ia_subnet = i & ia->ia_subnetmask;
744 in_socktrim(&ia->ia_sockmask);
745 #ifdef DEV_CARP
746 /*
747 * XXX: carp(4) does not have interface route
748 */
749 if (ifp->if_type == IFT_CARP)
750 return (0);
751 #endif
752 /*
753 * Add route for the network.
754 */
755 ia->ia_ifa.ifa_metric = ifp->if_metric;
756 if (ifp->if_flags & IFF_BROADCAST) {
757 ia->ia_broadaddr.sin_addr.s_addr =
758 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
759 ia->ia_netbroadcast.s_addr =
760 htonl(ia->ia_net | ~ ia->ia_netmask);
761 } else if (ifp->if_flags & IFF_LOOPBACK) {
762 ia->ia_dstaddr = ia->ia_addr;
763 flags |= RTF_HOST;
764 } else if (ifp->if_flags & IFF_POINTOPOINT) {
765 if (ia->ia_dstaddr.sin_family != AF_INET)
766 return (0);
767 flags |= RTF_HOST;
768 }
769 if ((error = in_addprefix(ia, flags)) != 0)
770 return (error);
771
772 /*
773 * If the interface supports multicast, join the "all hosts"
774 * multicast group on that interface.
775 */
776 if (ifp->if_flags & IFF_MULTICAST) {
777 struct in_addr addr;
778
779 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
780 in_addmulti(&addr, ifp);
781 }
782 return (error);
783 }
784
785 #define rtinitflags(x) \
786 ((((x)->ia_ifp->if_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) != 0) \
787 ? RTF_HOST : 0)
788 /*
789 * Check if we have a route for the given prefix already or add a one
790 * accordingly.
791 */
792 static int
793 in_addprefix(target, flags)
794 struct in_ifaddr *target;
795 int flags;
796 {
797 struct in_ifaddr *ia;
798 struct in_addr prefix, mask, p, m;
799 int error;
800
801 if ((flags & RTF_HOST) != 0)
802 prefix = target->ia_dstaddr.sin_addr;
803 else {
804 prefix = target->ia_addr.sin_addr;
805 mask = target->ia_sockmask.sin_addr;
806 prefix.s_addr &= mask.s_addr;
807 }
808
809 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
810 if (rtinitflags(ia)) {
811 p = ia->ia_addr.sin_addr;
812
813 if (prefix.s_addr != p.s_addr)
814 continue;
815 } else {
816 p = ia->ia_addr.sin_addr;
817 m = ia->ia_sockmask.sin_addr;
818 p.s_addr &= m.s_addr;
819
820 if (prefix.s_addr != p.s_addr ||
821 mask.s_addr != m.s_addr)
822 continue;
823 }
824
825 /*
826 * If we got a matching prefix route inserted by other
827 * interface address, we are done here.
828 */
829 if (ia->ia_flags & IFA_ROUTE) {
830 if (sameprefixcarponly &&
831 target->ia_ifp->if_type != IFT_CARP &&
832 ia->ia_ifp->if_type != IFT_CARP)
833 return (EEXIST);
834 else
835 return (0);
836 }
837 }
838
839 /*
840 * No-one seem to have this prefix route, so we try to insert it.
841 */
842 error = rtinit(&target->ia_ifa, (int)RTM_ADD, flags);
843 if (!error)
844 target->ia_flags |= IFA_ROUTE;
845 return error;
846 }
847
848 /*
849 * If there is no other address in the system that can serve a route to the
850 * same prefix, remove the route. Hand over the route to the new address
851 * otherwise.
852 */
853 static int
854 in_scrubprefix(target)
855 struct in_ifaddr *target;
856 {
857 struct in_ifaddr *ia;
858 struct in_addr prefix, mask, p;
859 int error;
860
861 if ((target->ia_flags & IFA_ROUTE) == 0)
862 return 0;
863
864 if (rtinitflags(target))
865 prefix = target->ia_dstaddr.sin_addr;
866 else {
867 prefix = target->ia_addr.sin_addr;
868 mask = target->ia_sockmask.sin_addr;
869 prefix.s_addr &= mask.s_addr;
870 }
871
872 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
873 if (rtinitflags(ia))
874 p = ia->ia_dstaddr.sin_addr;
875 else {
876 p = ia->ia_addr.sin_addr;
877 p.s_addr &= ia->ia_sockmask.sin_addr.s_addr;
878 }
879
880 if (prefix.s_addr != p.s_addr)
881 continue;
882
883 /*
884 * If we got a matching prefix address, move IFA_ROUTE and
885 * the route itself to it. Make sure that routing daemons
886 * get a heads-up.
887 *
888 * XXX: a special case for carp(4) interface
889 */
890 if ((ia->ia_flags & IFA_ROUTE) == 0
891 #ifdef DEV_CARP
892 && (ia->ia_ifp->if_type != IFT_CARP)
893 #endif
894 ) {
895 rtinit(&(target->ia_ifa), (int)RTM_DELETE,
896 rtinitflags(target));
897 target->ia_flags &= ~IFA_ROUTE;
898
899 error = rtinit(&ia->ia_ifa, (int)RTM_ADD,
900 rtinitflags(ia) | RTF_UP);
901 if (error == 0)
902 ia->ia_flags |= IFA_ROUTE;
903 return error;
904 }
905 }
906
907 /*
908 * As no-one seem to have this prefix, we can remove the route.
909 */
910 rtinit(&(target->ia_ifa), (int)RTM_DELETE, rtinitflags(target));
911 target->ia_flags &= ~IFA_ROUTE;
912 return 0;
913 }
914
915 #undef rtinitflags
916
917 /*
918 * Return 1 if the address might be a local broadcast address.
919 */
920 int
921 in_broadcast(in, ifp)
922 struct in_addr in;
923 struct ifnet *ifp;
924 {
925 register struct ifaddr *ifa;
926 u_long t;
927
928 if (in.s_addr == INADDR_BROADCAST ||
929 in.s_addr == INADDR_ANY)
930 return 1;
931 if ((ifp->if_flags & IFF_BROADCAST) == 0)
932 return 0;
933 t = ntohl(in.s_addr);
934 /*
935 * Look through the list of addresses for a match
936 * with a broadcast address.
937 */
938 #define ia ((struct in_ifaddr *)ifa)
939 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
940 if (ifa->ifa_addr->sa_family == AF_INET &&
941 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
942 in.s_addr == ia->ia_netbroadcast.s_addr ||
943 /*
944 * Check for old-style (host 0) broadcast.
945 */
946 t == ia->ia_subnet || t == ia->ia_net) &&
947 /*
948 * Check for an all one subnetmask. These
949 * only exist when an interface gets a secondary
950 * address.
951 */
952 ia->ia_subnetmask != (u_long)0xffffffff)
953 return 1;
954 return (0);
955 #undef ia
956 }
957 /*
958 * Add an address to the list of IP multicast addresses for a given interface.
959 */
960 struct in_multi *
961 in_addmulti(ap, ifp)
962 register struct in_addr *ap;
963 register struct ifnet *ifp;
964 {
965 register struct in_multi *inm;
966 int error;
967 struct sockaddr_in sin;
968 struct ifmultiaddr *ifma;
969
970 IFF_LOCKGIANT(ifp);
971 IN_MULTI_LOCK();
972 /*
973 * Call generic routine to add membership or increment
974 * refcount. It wants addresses in the form of a sockaddr,
975 * so we build one here (being careful to zero the unused bytes).
976 */
977 bzero(&sin, sizeof sin);
978 sin.sin_family = AF_INET;
979 sin.sin_len = sizeof sin;
980 sin.sin_addr = *ap;
981 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
982 if (error) {
983 IN_MULTI_UNLOCK();
984 IFF_UNLOCKGIANT(ifp);
985 return 0;
986 }
987
988 /*
989 * If ifma->ifma_protospec is null, then if_addmulti() created
990 * a new record. Otherwise, we are done.
991 */
992 if (ifma->ifma_protospec != NULL) {
993 IN_MULTI_UNLOCK();
994 IFF_UNLOCKGIANT(ifp);
995 return ifma->ifma_protospec;
996 }
997
998 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR,
999 M_NOWAIT | M_ZERO);
1000 if (inm == NULL) {
1001 IN_MULTI_UNLOCK();
1002 IFF_UNLOCKGIANT(ifp);
1003 return (NULL);
1004 }
1005
1006 inm->inm_addr = *ap;
1007 inm->inm_ifp = ifp;
1008 inm->inm_ifma = ifma;
1009 ifma->ifma_protospec = inm;
1010 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1011
1012 /*
1013 * Let IGMP know that we have joined a new IP multicast group.
1014 */
1015 igmp_joingroup(inm);
1016 IN_MULTI_UNLOCK();
1017 IFF_UNLOCKGIANT(ifp);
1018 return (inm);
1019 }
1020
1021 /*
1022 * Delete a multicast address record.
1023 */
1024 void
1025 in_delmulti(inm)
1026 register struct in_multi *inm;
1027 {
1028 struct ifmultiaddr *ifma;
1029 struct in_multi my_inm;
1030 struct ifnet *ifp;
1031
1032 ifp = inm->inm_ifp;
1033 IFF_LOCKGIANT(ifp);
1034 IN_MULTI_LOCK();
1035 ifma = inm->inm_ifma;
1036 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1037 if (ifma->ifma_refcount == 1) {
1038 /*
1039 * No remaining claims to this record; let IGMP know that
1040 * we are leaving the multicast group.
1041 * But do it after the if_delmulti() which might reset
1042 * the interface and nuke the packet.
1043 */
1044 my_inm = *inm ;
1045 ifma->ifma_protospec = NULL;
1046 LIST_REMOVE(inm, inm_link);
1047 free(inm, M_IPMADDR);
1048 }
1049 /* XXX - should be separate API for when we have an ifma? */
1050 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1051 if (my_inm.inm_ifp != NULL)
1052 igmp_leavegroup(&my_inm);
1053 IN_MULTI_UNLOCK();
1054 IFF_UNLOCKGIANT(ifp);
1055 }
1056
1057 /*
1058 * On interface removal, clean up IPv4 data structures hung off of the ifnet.
1059 */
1060 void
1061 in_ifdetach(ifp)
1062 struct ifnet *ifp;
1063 {
1064
1065 in_pcbpurgeif0(&ripcbinfo, ifp);
1066 in_pcbpurgeif0(&udbinfo, ifp);
1067 }
Cache object: b89ece006dee65e83380cffd191fe3fa
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