Register keyword removal
[dragonfly.git] / sys / netinet / in.c
CommitLineData
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1/*
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 *
33 * @(#)in.c 8.4 (Berkeley) 1/9/95
34 * $FreeBSD: src/sys/netinet/in.c,v 1.44.2.14 2002/11/08 00:45:50 suz Exp $
2256ba69 35 * $DragonFly: src/sys/netinet/in.c,v 1.6 2003/07/26 21:00:04 rob Exp $
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36 */
37
38#include "opt_bootp.h"
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/sockio.h>
42#include <sys/malloc.h>
43#include <sys/proc.h>
44#include <sys/socket.h>
45#include <sys/kernel.h>
46#include <sys/sysctl.h>
47
48#include <net/if.h>
49#include <net/if_types.h>
50#include <net/route.h>
51
52#include <netinet/in.h>
53#include <netinet/in_var.h>
54#include <netinet/in_pcb.h>
55
56#include <netinet/igmp_var.h>
57
58static MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
59
60static int in_mask2len __P((struct in_addr *));
61static void in_len2mask __P((struct in_addr *, int));
62static int in_lifaddr_ioctl __P((struct socket *, u_long, caddr_t,
dadab5e9 63 struct ifnet *, struct thread *));
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64
65static void in_socktrim __P((struct sockaddr_in *));
66static int in_ifinit __P((struct ifnet *,
67 struct in_ifaddr *, struct sockaddr_in *, int));
68
69static int subnetsarelocal = 0;
70SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
71 &subnetsarelocal, 0, "");
72
73struct in_multihead in_multihead; /* XXX BSS initialization */
74
75extern struct inpcbinfo ripcbinfo;
76extern struct inpcbinfo udbinfo;
77
78/*
79 * Return 1 if an internet address is for a ``local'' host
80 * (one to which we have a connection). If subnetsarelocal
81 * is true, this includes other subnets of the local net.
82 * Otherwise, it includes only the directly-connected (sub)nets.
83 */
84int
85in_localaddr(in)
86 struct in_addr in;
87{
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88 u_long i = ntohl(in.s_addr);
89 struct in_ifaddr *ia;
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90
91 if (subnetsarelocal) {
92 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
93 if ((i & ia->ia_netmask) == ia->ia_net)
94 return (1);
95 } else {
96 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link)
97 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
98 return (1);
99 }
100 return (0);
101}
102
103/*
104 * Determine whether an IP address is in a reserved set of addresses
105 * that may not be forwarded, or whether datagrams to that destination
106 * may be forwarded.
107 */
108int
109in_canforward(in)
110 struct in_addr in;
111{
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112 u_long i = ntohl(in.s_addr);
113 u_long net;
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114
115 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
116 return (0);
117 if (IN_CLASSA(i)) {
118 net = i & IN_CLASSA_NET;
119 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
120 return (0);
121 }
122 return (1);
123}
124
125/*
126 * Trim a mask in a sockaddr
127 */
128static void
129in_socktrim(ap)
130struct sockaddr_in *ap;
131{
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132 char *cplim = (char *) &ap->sin_addr;
133 char *cp = (char *) (&ap->sin_addr + 1);
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134
135 ap->sin_len = 0;
136 while (--cp >= cplim)
137 if (*cp) {
138 (ap)->sin_len = cp - (char *) (ap) + 1;
139 break;
140 }
141}
142
143static int
144in_mask2len(mask)
145 struct in_addr *mask;
146{
147 int x, y;
148 u_char *p;
149
150 p = (u_char *)mask;
151 for (x = 0; x < sizeof(*mask); x++) {
152 if (p[x] != 0xff)
153 break;
154 }
155 y = 0;
156 if (x < sizeof(*mask)) {
157 for (y = 0; y < 8; y++) {
158 if ((p[x] & (0x80 >> y)) == 0)
159 break;
160 }
161 }
162 return x * 8 + y;
163}
164
165static void
166in_len2mask(mask, len)
167 struct in_addr *mask;
168 int len;
169{
170 int i;
171 u_char *p;
172
173 p = (u_char *)mask;
174 bzero(mask, sizeof(*mask));
175 for (i = 0; i < len / 8; i++)
176 p[i] = 0xff;
177 if (len % 8)
178 p[i] = (0xff00 >> (len % 8)) & 0xff;
179}
180
181static int in_interfaces; /* number of external internet interfaces */
182
183/*
184 * Generic internet control operations (ioctl's).
185 * Ifp is 0 if not an interface-specific ioctl.
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186 *
187 * NOTE! td might be NULL.
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188 */
189/* ARGSUSED */
190int
dadab5e9 191in_control(so, cmd, data, ifp, td)
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192 struct socket *so;
193 u_long cmd;
194 caddr_t data;
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195 struct ifnet *ifp;
196 struct thread *td;
984263bc 197{
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198 struct ifreq *ifr = (struct ifreq *)data;
199 struct in_ifaddr *ia = 0, *iap;
200 struct ifaddr *ifa;
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201 struct in_addr dst;
202 struct in_ifaddr *oia;
203 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
204 struct sockaddr_in oldaddr;
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205 int hostIsNew, iaIsNew, maskIsNew, s;
206 int error = 0;
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207
208 iaIsNew = 0;
209
210 switch (cmd) {
211 case SIOCALIFADDR:
212 case SIOCDLIFADDR:
d5234de5 213 if (td && (error = suser(td)) != 0)
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214 return error;
215 /*fall through*/
216 case SIOCGLIFADDR:
217 if (!ifp)
218 return EINVAL;
dadab5e9 219 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
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220 }
221
222 /*
223 * Find address for this interface, if it exists.
224 *
225 * If an alias address was specified, find that one instead of
226 * the first one on the interface, if possible
227 */
228 if (ifp) {
229 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
230 LIST_FOREACH(iap, INADDR_HASH(dst.s_addr), ia_hash)
231 if (iap->ia_ifp == ifp &&
232 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
233 ia = iap;
234 break;
235 }
236 if (ia == NULL)
237 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
238 iap = ifatoia(ifa);
239 if (iap->ia_addr.sin_family == AF_INET) {
240 ia = iap;
241 break;
242 }
243 }
244 }
245
246 switch (cmd) {
247
248 case SIOCAIFADDR:
249 case SIOCDIFADDR:
250 if (ifp == 0)
251 return (EADDRNOTAVAIL);
252 if (ifra->ifra_addr.sin_family == AF_INET) {
253 for (oia = ia; ia; ia = TAILQ_NEXT(ia, ia_link)) {
254 if (ia->ia_ifp == ifp &&
255 ia->ia_addr.sin_addr.s_addr ==
256 ifra->ifra_addr.sin_addr.s_addr)
257 break;
258 }
259 if ((ifp->if_flags & IFF_POINTOPOINT)
260 && (cmd == SIOCAIFADDR)
261 && (ifra->ifra_dstaddr.sin_addr.s_addr
262 == INADDR_ANY)) {
263 return EDESTADDRREQ;
264 }
265 }
266 if (cmd == SIOCDIFADDR && ia == 0)
267 return (EADDRNOTAVAIL);
268 /* FALLTHROUGH */
269 case SIOCSIFADDR:
270 case SIOCSIFNETMASK:
271 case SIOCSIFDSTADDR:
d5234de5 272 if (td && (error = suser(td)) != 0)
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273 return error;
274
275 if (ifp == 0)
276 return (EADDRNOTAVAIL);
277 if (ia == (struct in_ifaddr *)0) {
278 ia = (struct in_ifaddr *)
279 malloc(sizeof *ia, M_IFADDR, M_WAITOK);
280 if (ia == (struct in_ifaddr *)NULL)
281 return (ENOBUFS);
282 bzero((caddr_t)ia, sizeof *ia);
283 /*
284 * Protect from ipintr() traversing address list
285 * while we're modifying it.
286 */
287 s = splnet();
288
289 TAILQ_INSERT_TAIL(&in_ifaddrhead, ia, ia_link);
290 ifa = &ia->ia_ifa;
291 TAILQ_INSERT_TAIL(&ifp->if_addrhead, ifa, ifa_link);
292
293 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
294 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
295 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
296 ia->ia_sockmask.sin_len = 8;
297 ia->ia_sockmask.sin_family = AF_INET;
298 if (ifp->if_flags & IFF_BROADCAST) {
299 ia->ia_broadaddr.sin_len = sizeof(ia->ia_addr);
300 ia->ia_broadaddr.sin_family = AF_INET;
301 }
302 ia->ia_ifp = ifp;
303 if (!(ifp->if_flags & IFF_LOOPBACK))
304 in_interfaces++;
305 iaIsNew = 1;
306 splx(s);
307 }
308 break;
309
310 case SIOCSIFBRDADDR:
d5234de5 311 if (td && (error = suser(td)) != 0)
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312 return error;
313 /* FALLTHROUGH */
314
315 case SIOCGIFADDR:
316 case SIOCGIFNETMASK:
317 case SIOCGIFDSTADDR:
318 case SIOCGIFBRDADDR:
319 if (ia == (struct in_ifaddr *)0)
320 return (EADDRNOTAVAIL);
321 break;
322 }
323 switch (cmd) {
324
325 case SIOCGIFADDR:
326 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
327 return (0);
328
329 case SIOCGIFBRDADDR:
330 if ((ifp->if_flags & IFF_BROADCAST) == 0)
331 return (EINVAL);
332 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
333 return (0);
334
335 case SIOCGIFDSTADDR:
336 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
337 return (EINVAL);
338 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
339 return (0);
340
341 case SIOCGIFNETMASK:
342 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
343 return (0);
344
345 case SIOCSIFDSTADDR:
346 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
347 return (EINVAL);
348 oldaddr = ia->ia_dstaddr;
349 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
350 if (ifp->if_ioctl && (error = (*ifp->if_ioctl)
351 (ifp, SIOCSIFDSTADDR, (caddr_t)ia))) {
352 ia->ia_dstaddr = oldaddr;
353 return (error);
354 }
355 if (ia->ia_flags & IFA_ROUTE) {
356 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
357 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
358 ia->ia_ifa.ifa_dstaddr =
359 (struct sockaddr *)&ia->ia_dstaddr;
360 rtinit(&(ia->ia_ifa), (int)RTM_ADD, RTF_HOST|RTF_UP);
361 }
362 return (0);
363
364 case SIOCSIFBRDADDR:
365 if ((ifp->if_flags & IFF_BROADCAST) == 0)
366 return (EINVAL);
367 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
368 return (0);
369
370 case SIOCSIFADDR:
371 error = in_ifinit(ifp, ia,
372 (struct sockaddr_in *) &ifr->ifr_addr, 1);
373 if (error != 0 && iaIsNew)
374 break;
375 return (0);
376
377 case SIOCSIFNETMASK:
378 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
379 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
380 return (0);
381
382 case SIOCAIFADDR:
383 maskIsNew = 0;
384 hostIsNew = 1;
385 error = 0;
386 if (ia->ia_addr.sin_family == AF_INET) {
387 if (ifra->ifra_addr.sin_len == 0) {
388 ifra->ifra_addr = ia->ia_addr;
389 hostIsNew = 0;
390 } else if (ifra->ifra_addr.sin_addr.s_addr ==
391 ia->ia_addr.sin_addr.s_addr)
392 hostIsNew = 0;
393 }
394 if (ifra->ifra_mask.sin_len) {
395 in_ifscrub(ifp, ia);
396 ia->ia_sockmask = ifra->ifra_mask;
397 ia->ia_sockmask.sin_family = AF_INET;
398 ia->ia_subnetmask =
399 ntohl(ia->ia_sockmask.sin_addr.s_addr);
400 maskIsNew = 1;
401 }
402 if ((ifp->if_flags & IFF_POINTOPOINT) &&
403 (ifra->ifra_dstaddr.sin_family == AF_INET)) {
404 in_ifscrub(ifp, ia);
405 ia->ia_dstaddr = ifra->ifra_dstaddr;
406 maskIsNew = 1; /* We lie; but the effect's the same */
407 }
408 if (ifra->ifra_addr.sin_family == AF_INET &&
409 (hostIsNew || maskIsNew))
410 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
411
412 if (error != 0 && iaIsNew)
413 break;
414
415 if ((ifp->if_flags & IFF_BROADCAST) &&
416 (ifra->ifra_broadaddr.sin_family == AF_INET))
417 ia->ia_broadaddr = ifra->ifra_broadaddr;
418 return (error);
419
420 case SIOCDIFADDR:
421 /*
422 * in_ifscrub kills the interface route.
423 */
424 in_ifscrub(ifp, ia);
425 /*
426 * in_ifadown gets rid of all the rest of
427 * the routes. This is not quite the right
428 * thing to do, but at least if we are running
429 * a routing process they will come back.
430 */
431 in_ifadown(&ia->ia_ifa, 1);
432 /*
433 * XXX horrible hack to detect that we are being called
434 * from if_detach()
435 */
436 if (!ifnet_addrs[ifp->if_index - 1]) {
437 in_pcbpurgeif0(LIST_FIRST(ripcbinfo.listhead), ifp);
438 in_pcbpurgeif0(LIST_FIRST(udbinfo.listhead), ifp);
439 }
440 error = 0;
441 break;
442
443 default:
444 if (ifp == 0 || ifp->if_ioctl == 0)
445 return (EOPNOTSUPP);
446 return ((*ifp->if_ioctl)(ifp, cmd, data));
447 }
448
449 /*
450 * Protect from ipintr() traversing address list while we're modifying
451 * it.
452 */
453 s = splnet();
454 TAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
455 TAILQ_REMOVE(&in_ifaddrhead, ia, ia_link);
456 LIST_REMOVE(ia, ia_hash);
457 IFAFREE(&ia->ia_ifa);
458 splx(s);
459
460 return (error);
461}
462
463/*
464 * SIOC[GAD]LIFADDR.
465 * SIOCGLIFADDR: get first address. (?!?)
466 * SIOCGLIFADDR with IFLR_PREFIX:
467 * get first address that matches the specified prefix.
468 * SIOCALIFADDR: add the specified address.
469 * SIOCALIFADDR with IFLR_PREFIX:
470 * EINVAL since we can't deduce hostid part of the address.
471 * SIOCDLIFADDR: delete the specified address.
472 * SIOCDLIFADDR with IFLR_PREFIX:
473 * delete the first address that matches the specified prefix.
474 * return values:
475 * EINVAL on invalid parameters
476 * EADDRNOTAVAIL on prefix match failed/specified address not found
477 * other values may be returned from in_ioctl()
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478 *
479 * NOTE! td might be NULL.
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480 */
481static int
dadab5e9 482in_lifaddr_ioctl(so, cmd, data, ifp, td)
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483 struct socket *so;
484 u_long cmd;
485 caddr_t data;
486 struct ifnet *ifp;
dadab5e9 487 struct thread *td;
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488{
489 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
490 struct ifaddr *ifa;
491
492 /* sanity checks */
493 if (!data || !ifp) {
494 panic("invalid argument to in_lifaddr_ioctl");
495 /*NOTRECHED*/
496 }
497
498 switch (cmd) {
499 case SIOCGLIFADDR:
500 /* address must be specified on GET with IFLR_PREFIX */
501 if ((iflr->flags & IFLR_PREFIX) == 0)
502 break;
503 /*FALLTHROUGH*/
504 case SIOCALIFADDR:
505 case SIOCDLIFADDR:
506 /* address must be specified on ADD and DELETE */
507 if (iflr->addr.ss_family != AF_INET)
508 return EINVAL;
509 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
510 return EINVAL;
511 /* XXX need improvement */
512 if (iflr->dstaddr.ss_family
513 && iflr->dstaddr.ss_family != AF_INET)
514 return EINVAL;
515 if (iflr->dstaddr.ss_family
516 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
517 return EINVAL;
518 break;
519 default: /*shouldn't happen*/
520 return EOPNOTSUPP;
521 }
522 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
523 return EINVAL;
524
525 switch (cmd) {
526 case SIOCALIFADDR:
527 {
528 struct in_aliasreq ifra;
529
530 if (iflr->flags & IFLR_PREFIX)
531 return EINVAL;
532
533 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
534 bzero(&ifra, sizeof(ifra));
535 bcopy(iflr->iflr_name, ifra.ifra_name,
536 sizeof(ifra.ifra_name));
537
538 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
539
540 if (iflr->dstaddr.ss_family) { /*XXX*/
541 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
542 iflr->dstaddr.ss_len);
543 }
544
545 ifra.ifra_mask.sin_family = AF_INET;
546 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
547 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
548
dadab5e9 549 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
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550 }
551 case SIOCGLIFADDR:
552 case SIOCDLIFADDR:
553 {
554 struct in_ifaddr *ia;
555 struct in_addr mask, candidate, match;
556 struct sockaddr_in *sin;
557 int cmp;
558
559 bzero(&mask, sizeof(mask));
560 if (iflr->flags & IFLR_PREFIX) {
561 /* lookup a prefix rather than address. */
562 in_len2mask(&mask, iflr->prefixlen);
563
564 sin = (struct sockaddr_in *)&iflr->addr;
565 match.s_addr = sin->sin_addr.s_addr;
566 match.s_addr &= mask.s_addr;
567
568 /* if you set extra bits, that's wrong */
569 if (match.s_addr != sin->sin_addr.s_addr)
570 return EINVAL;
571
572 cmp = 1;
573 } else {
574 if (cmd == SIOCGLIFADDR) {
575 /* on getting an address, take the 1st match */
576 cmp = 0; /*XXX*/
577 } else {
578 /* on deleting an address, do exact match */
579 in_len2mask(&mask, 32);
580 sin = (struct sockaddr_in *)&iflr->addr;
581 match.s_addr = sin->sin_addr.s_addr;
582
583 cmp = 1;
584 }
585 }
586
587 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
588 if (ifa->ifa_addr->sa_family != AF_INET6)
589 continue;
590 if (!cmp)
591 break;
592 candidate.s_addr = ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
593 candidate.s_addr &= mask.s_addr;
594 if (candidate.s_addr == match.s_addr)
595 break;
596 }
597 if (!ifa)
598 return EADDRNOTAVAIL;
599 ia = (struct in_ifaddr *)ifa;
600
601 if (cmd == SIOCGLIFADDR) {
602 /* fill in the if_laddrreq structure */
603 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
604
605 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
606 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
607 ia->ia_dstaddr.sin_len);
608 } else
609 bzero(&iflr->dstaddr, sizeof(iflr->dstaddr));
610
611 iflr->prefixlen =
612 in_mask2len(&ia->ia_sockmask.sin_addr);
613
614 iflr->flags = 0; /*XXX*/
615
616 return 0;
617 } else {
618 struct in_aliasreq ifra;
619
620 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
621 bzero(&ifra, sizeof(ifra));
622 bcopy(iflr->iflr_name, ifra.ifra_name,
623 sizeof(ifra.ifra_name));
624
625 bcopy(&ia->ia_addr, &ifra.ifra_addr,
626 ia->ia_addr.sin_len);
627 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
628 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
629 ia->ia_dstaddr.sin_len);
630 }
631 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
632 ia->ia_sockmask.sin_len);
633
634 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
dadab5e9 635 ifp, td);
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636 }
637 }
638 }
639
640 return EOPNOTSUPP; /*just for safety*/
641}
642
643/*
644 * Delete any existing route for an interface.
645 */
646void
647in_ifscrub(ifp, ia)
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648 struct ifnet *ifp;
649 struct in_ifaddr *ia;
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650{
651
652 if ((ia->ia_flags & IFA_ROUTE) == 0)
653 return;
654 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
655 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, RTF_HOST);
656 else
657 rtinit(&(ia->ia_ifa), (int)RTM_DELETE, 0);
658 ia->ia_flags &= ~IFA_ROUTE;
659}
660
661/*
662 * Initialize an interface's internet address
663 * and routing table entry.
664 */
665static int
666in_ifinit(ifp, ia, sin, scrub)
2256ba69
RG
667 struct ifnet *ifp;
668 struct in_ifaddr *ia;
984263bc
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669 struct sockaddr_in *sin;
670 int scrub;
671{
2256ba69 672 u_long i = ntohl(sin->sin_addr.s_addr);
984263bc
MD
673 struct sockaddr_in oldaddr;
674 int s = splimp(), flags = RTF_UP, error = 0;
675
676 oldaddr = ia->ia_addr;
677 if (oldaddr.sin_family == AF_INET)
678 LIST_REMOVE(ia, ia_hash);
679 ia->ia_addr = *sin;
680 if (ia->ia_addr.sin_family == AF_INET)
681 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
682 ia, ia_hash);
683 /*
684 * Give the interface a chance to initialize
685 * if this is its first address,
686 * and to validate the address if necessary.
687 */
688 if (ifp->if_ioctl &&
689 (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia))) {
690 splx(s);
691 /* LIST_REMOVE(ia, ia_hash) is done in in_control */
692 ia->ia_addr = oldaddr;
693 if (ia->ia_addr.sin_family == AF_INET)
694 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
695 ia, ia_hash);
696 return (error);
697 }
698 splx(s);
699 if (scrub) {
700 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
701 in_ifscrub(ifp, ia);
702 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
703 }
704 if (IN_CLASSA(i))
705 ia->ia_netmask = IN_CLASSA_NET;
706 else if (IN_CLASSB(i))
707 ia->ia_netmask = IN_CLASSB_NET;
708 else
709 ia->ia_netmask = IN_CLASSC_NET;
710 /*
711 * The subnet mask usually includes at least the standard network part,
712 * but may may be smaller in the case of supernetting.
713 * If it is set, we believe it.
714 */
715 if (ia->ia_subnetmask == 0) {
716 ia->ia_subnetmask = ia->ia_netmask;
717 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
718 } else
719 ia->ia_netmask &= ia->ia_subnetmask;
720 ia->ia_net = i & ia->ia_netmask;
721 ia->ia_subnet = i & ia->ia_subnetmask;
722 in_socktrim(&ia->ia_sockmask);
723 /*
724 * Add route for the network.
725 */
726 ia->ia_ifa.ifa_metric = ifp->if_metric;
727 if (ifp->if_flags & IFF_BROADCAST) {
728 ia->ia_broadaddr.sin_addr.s_addr =
729 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
730 ia->ia_netbroadcast.s_addr =
731 htonl(ia->ia_net | ~ ia->ia_netmask);
732 } else if (ifp->if_flags & IFF_LOOPBACK) {
733 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
734 flags |= RTF_HOST;
735 } else if (ifp->if_flags & IFF_POINTOPOINT) {
736 if (ia->ia_dstaddr.sin_family != AF_INET)
737 return (0);
738 flags |= RTF_HOST;
739 }
740
741 /*-
742 * Don't add host routes for interface addresses of
743 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
744 * possible to assign several such address pairs with consistent
745 * results (no host route) and is required by BOOTP.
746 *
747 * XXX: This is ugly ! There should be a way for the caller to
748 * say that they don't want a host route.
749 */
750 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
751 ia->ia_netmask != IN_CLASSA_NET ||
752 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
753 if ((error = rtinit(&ia->ia_ifa, (int)RTM_ADD, flags)) != 0) {
754 ia->ia_addr = oldaddr;
755 return (error);
756 }
757 ia->ia_flags |= IFA_ROUTE;
758 }
759
760 /*
761 * If the interface supports multicast, join the "all hosts"
762 * multicast group on that interface.
763 */
764 if (ifp->if_flags & IFF_MULTICAST) {
765 struct in_addr addr;
766
767 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
768 in_addmulti(&addr, ifp);
769 }
770 return (error);
771}
772
773
774/*
775 * Return 1 if the address might be a local broadcast address.
776 */
777int
778in_broadcast(in, ifp)
779 struct in_addr in;
780 struct ifnet *ifp;
781{
2256ba69 782 struct ifaddr *ifa;
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783 u_long t;
784
785 if (in.s_addr == INADDR_BROADCAST ||
786 in.s_addr == INADDR_ANY)
787 return 1;
788 if ((ifp->if_flags & IFF_BROADCAST) == 0)
789 return 0;
790 t = ntohl(in.s_addr);
791 /*
792 * Look through the list of addresses for a match
793 * with a broadcast address.
794 */
795#define ia ((struct in_ifaddr *)ifa)
796 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
797 if (ifa->ifa_addr->sa_family == AF_INET &&
798 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
799 in.s_addr == ia->ia_netbroadcast.s_addr ||
800 /*
801 * Check for old-style (host 0) broadcast.
802 */
803 t == ia->ia_subnet || t == ia->ia_net) &&
804 /*
805 * Check for an all one subnetmask. These
806 * only exist when an interface gets a secondary
807 * address.
808 */
809 ia->ia_subnetmask != (u_long)0xffffffff)
810 return 1;
811 return (0);
812#undef ia
813}
814/*
815 * Add an address to the list of IP multicast addresses for a given interface.
816 */
817struct in_multi *
818in_addmulti(ap, ifp)
2256ba69
RG
819 struct in_addr *ap;
820 struct ifnet *ifp;
984263bc 821{
2256ba69 822 struct in_multi *inm;
984263bc
MD
823 int error;
824 struct sockaddr_in sin;
825 struct ifmultiaddr *ifma;
826 int s = splnet();
827
828 /*
829 * Call generic routine to add membership or increment
830 * refcount. It wants addresses in the form of a sockaddr,
831 * so we build one here (being careful to zero the unused bytes).
832 */
833 bzero(&sin, sizeof sin);
834 sin.sin_family = AF_INET;
835 sin.sin_len = sizeof sin;
836 sin.sin_addr = *ap;
837 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
838 if (error) {
839 splx(s);
840 return 0;
841 }
842
843 /*
844 * If ifma->ifma_protospec is null, then if_addmulti() created
845 * a new record. Otherwise, we are done.
846 */
847 if (ifma->ifma_protospec != 0) {
848 splx(s);
849 return ifma->ifma_protospec;
850 }
851
852 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
853 at interrupt time? If so, need to fix if_addmulti. XXX */
854 inm = (struct in_multi *)malloc(sizeof(*inm), M_IPMADDR, M_NOWAIT);
855 if (inm == NULL) {
856 splx(s);
857 return (NULL);
858 }
859
860 bzero(inm, sizeof *inm);
861 inm->inm_addr = *ap;
862 inm->inm_ifp = ifp;
863 inm->inm_ifma = ifma;
864 ifma->ifma_protospec = inm;
865 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
866
867 /*
868 * Let IGMP know that we have joined a new IP multicast group.
869 */
870 igmp_joingroup(inm);
871 splx(s);
872 return (inm);
873}
874
875/*
876 * Delete a multicast address record.
877 */
878void
879in_delmulti(inm)
2256ba69 880 struct in_multi *inm;
984263bc
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881{
882 struct ifmultiaddr *ifma = inm->inm_ifma;
883 struct in_multi my_inm;
884 int s = splnet();
885
886 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
887 if (ifma->ifma_refcount == 1) {
888 /*
889 * No remaining claims to this record; let IGMP know that
890 * we are leaving the multicast group.
891 * But do it after the if_delmulti() which might reset
892 * the interface and nuke the packet.
893 */
894 my_inm = *inm ;
895 ifma->ifma_protospec = 0;
896 LIST_REMOVE(inm, inm_link);
897 free(inm, M_IPMADDR);
898 }
899 /* XXX - should be separate API for when we have an ifma? */
900 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
901 if (my_inm.inm_ifp != NULL)
902 igmp_leavegroup(&my_inm);
903 splx(s);
904}