HAMMER 60I/Many: Mirroring
[dragonfly.git] / sys / netinet / in.c
blob6d0818dac8b0d9418a09857fdb24363cfbef5ada
1 /*
2 * Copyright (c) 1982, 1986, 1991, 1993
3 * The Regents of the University of California. All rights reserved.
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.
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.
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 $
35 * $DragonFly: src/sys/netinet/in.c,v 1.40 2008/06/14 08:40:16 sephe Exp $
38 #include "opt_bootp.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/sockio.h>
43 #include <sys/malloc.h>
44 #include <sys/proc.h>
45 #include <sys/msgport.h>
46 #include <sys/socket.h>
48 #include <sys/kernel.h>
49 #include <sys/sysctl.h>
50 #include <sys/thread2.h>
52 #include <net/if.h>
53 #include <net/if_types.h>
54 #include <net/route.h>
55 #include <net/netmsg2.h>
57 #include <netinet/in.h>
58 #include <netinet/in_var.h>
59 #include <netinet/in_pcb.h>
61 #include <netinet/igmp_var.h>
63 MALLOC_DEFINE(M_IPMADDR, "in_multi", "internet multicast address");
65 static int in_mask2len (struct in_addr *);
66 static void in_len2mask (struct in_addr *, int);
67 static int in_lifaddr_ioctl (struct socket *, u_long, caddr_t,
68 struct ifnet *, struct thread *);
70 static void in_socktrim (struct sockaddr_in *);
71 static int in_ifinit(struct ifnet *, struct in_ifaddr *,
72 const struct sockaddr_in *, int);
74 static void in_control_dispatch(struct netmsg *);
75 static int in_control_internal(u_long, caddr_t, struct ifnet *,
76 struct thread *);
78 static int subnetsarelocal = 0;
79 SYSCTL_INT(_net_inet_ip, OID_AUTO, subnets_are_local, CTLFLAG_RW,
80 &subnetsarelocal, 0, "");
82 struct in_multihead in_multihead; /* XXX BSS initialization */
84 extern struct inpcbinfo ripcbinfo;
85 extern struct inpcbinfo udbinfo;
88 * Return 1 if an internet address is for a ``local'' host
89 * (one to which we have a connection). If subnetsarelocal
90 * is true, this includes other subnets of the local net.
91 * Otherwise, it includes only the directly-connected (sub)nets.
93 int
94 in_localaddr(struct in_addr in)
96 u_long i = ntohl(in.s_addr);
97 struct in_ifaddr_container *iac;
98 struct in_ifaddr *ia;
100 if (subnetsarelocal) {
101 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
102 ia = iac->ia;
104 if ((i & ia->ia_netmask) == ia->ia_net)
105 return (1);
107 } else {
108 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
109 ia = iac->ia;
111 if ((i & ia->ia_subnetmask) == ia->ia_subnet)
112 return (1);
115 return (0);
119 * Determine whether an IP address is in a reserved set of addresses
120 * that may not be forwarded, or whether datagrams to that destination
121 * may be forwarded.
124 in_canforward(struct in_addr in)
126 u_long i = ntohl(in.s_addr);
127 u_long net;
129 if (IN_EXPERIMENTAL(i) || IN_MULTICAST(i))
130 return (0);
131 if (IN_CLASSA(i)) {
132 net = i & IN_CLASSA_NET;
133 if (net == 0 || net == (IN_LOOPBACKNET << IN_CLASSA_NSHIFT))
134 return (0);
136 return (1);
140 * Trim a mask in a sockaddr
142 static void
143 in_socktrim(struct sockaddr_in *ap)
145 char *cplim = (char *) &ap->sin_addr;
146 char *cp = (char *) (&ap->sin_addr + 1);
148 ap->sin_len = 0;
149 while (--cp >= cplim)
150 if (*cp) {
151 (ap)->sin_len = cp - (char *) (ap) + 1;
152 break;
156 static int
157 in_mask2len(struct in_addr *mask)
159 int x, y;
160 u_char *p;
162 p = (u_char *)mask;
163 for (x = 0; x < sizeof *mask; x++) {
164 if (p[x] != 0xff)
165 break;
167 y = 0;
168 if (x < sizeof *mask) {
169 for (y = 0; y < 8; y++) {
170 if ((p[x] & (0x80 >> y)) == 0)
171 break;
174 return x * 8 + y;
177 static void
178 in_len2mask(struct in_addr *mask, int len)
180 int i;
181 u_char *p;
183 p = (u_char *)mask;
184 bzero(mask, sizeof *mask);
185 for (i = 0; i < len / 8; i++)
186 p[i] = 0xff;
187 if (len % 8)
188 p[i] = (0xff00 >> (len % 8)) & 0xff;
191 static int in_interfaces; /* number of external internet interfaces */
193 struct in_control_arg {
194 u_long cmd;
195 caddr_t data;
196 struct ifnet *ifp;
197 struct thread *td;
200 static void
201 in_control_dispatch(struct netmsg *nmsg)
203 struct lwkt_msg *msg = &nmsg->nm_lmsg;
204 const struct in_control_arg *arg = msg->u.ms_resultp;
205 int error;
207 error = in_control_internal(arg->cmd, arg->data, arg->ifp, arg->td);
208 lwkt_replymsg(msg, error);
212 * Generic internet control operations (ioctl's).
213 * Ifp is 0 if not an interface-specific ioctl.
215 * NOTE! td might be NULL.
217 /* ARGSUSED */
219 in_control(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
220 struct thread *td)
222 struct netmsg nmsg;
223 struct in_control_arg arg;
224 struct lwkt_msg *msg;
225 int error;
227 switch (cmd) {
228 case SIOCALIFADDR:
229 case SIOCDLIFADDR:
230 if (td && (error = suser(td)) != 0)
231 return error;
232 /* FALLTHROUGH */
233 case SIOCGLIFADDR:
234 if (!ifp)
235 return EINVAL;
236 return in_lifaddr_ioctl(so, cmd, data, ifp, td);
239 KASSERT(cmd != SIOCALIFADDR && cmd != SIOCDLIFADDR,
240 ("recursive SIOC%cLIFADDR!\n",
241 cmd == SIOCDLIFADDR ? 'D' : 'A'));
244 * IFADDR alterations are serialized by netisr0
246 switch (cmd) {
247 case SIOCSIFDSTADDR:
248 case SIOCSIFBRDADDR:
249 case SIOCSIFADDR:
250 case SIOCSIFNETMASK:
251 case SIOCAIFADDR:
252 case SIOCDIFADDR:
253 bzero(&arg, sizeof(arg));
254 arg.cmd = cmd;
255 arg.data = data;
256 arg.ifp = ifp;
257 arg.td = td;
259 netmsg_init(&nmsg, &curthread->td_msgport, 0,
260 in_control_dispatch);
261 msg = &nmsg.nm_lmsg;
262 msg->u.ms_resultp = &arg;
264 lwkt_domsg(cpu_portfn(0), msg, 0);
265 return msg->ms_error;
266 default:
267 return in_control_internal(cmd, data, ifp, td);
271 static void
272 in_ialink_dispatch(struct netmsg *nmsg)
274 struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
275 struct in_ifaddr *ia = lmsg->u.ms_resultp;
276 struct ifaddr_container *ifac;
277 struct in_ifaddr_container *iac;
278 int cpu = mycpuid;
280 crit_enter();
282 ifac = &ia->ia_ifa.ifa_containers[cpu];
283 ASSERT_IFAC_VALID(ifac);
284 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD) == 0,
285 ("ia is on in_ifaddrheads\n"));
287 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHEAD;
288 iac = &ifac->ifa_proto_u.u_in_ifac;
289 TAILQ_INSERT_TAIL(&in_ifaddrheads[cpu], iac, ia_link);
291 crit_exit();
293 ifa_forwardmsg(lmsg, cpu + 1);
296 static void
297 in_iaunlink_dispatch(struct netmsg *nmsg)
299 struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
300 struct in_ifaddr *ia = lmsg->u.ms_resultp;
301 struct ifaddr_container *ifac;
302 struct in_ifaddr_container *iac;
303 int cpu = mycpuid;
305 crit_enter();
307 ifac = &ia->ia_ifa.ifa_containers[cpu];
308 ASSERT_IFAC_VALID(ifac);
309 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
310 ("ia is not on in_ifaddrheads\n"));
312 iac = &ifac->ifa_proto_u.u_in_ifac;
313 TAILQ_REMOVE(&in_ifaddrheads[cpu], iac, ia_link);
314 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHEAD;
316 crit_exit();
318 ifa_forwardmsg(lmsg, cpu + 1);
321 static void
322 in_iahashins_dispatch(struct netmsg *nmsg)
324 struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
325 struct in_ifaddr *ia = lmsg->u.ms_resultp;
326 struct ifaddr_container *ifac;
327 struct in_ifaddr_container *iac;
328 int cpu = mycpuid;
330 crit_enter();
332 ifac = &ia->ia_ifa.ifa_containers[cpu];
333 ASSERT_IFAC_VALID(ifac);
334 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
335 ("ia is on in_ifaddrhashtbls\n"));
337 ifac->ifa_listmask |= IFA_LIST_IN_IFADDRHASH;
338 iac = &ifac->ifa_proto_u.u_in_ifac;
339 LIST_INSERT_HEAD(INADDR_HASH(ia->ia_addr.sin_addr.s_addr),
340 iac, ia_hash);
342 crit_exit();
344 ifa_forwardmsg(lmsg, cpu + 1);
347 static void
348 in_iahashrem_dispatch(struct netmsg *nmsg)
350 struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
351 struct in_ifaddr *ia = lmsg->u.ms_resultp;
352 struct ifaddr_container *ifac;
353 struct in_ifaddr_container *iac;
354 int cpu = mycpuid;
356 crit_enter();
358 ifac = &ia->ia_ifa.ifa_containers[cpu];
359 ASSERT_IFAC_VALID(ifac);
360 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH,
361 ("ia is not on in_ifaddrhashtbls\n"));
363 iac = &ifac->ifa_proto_u.u_in_ifac;
364 LIST_REMOVE(iac, ia_hash);
365 ifac->ifa_listmask &= ~IFA_LIST_IN_IFADDRHASH;
367 crit_exit();
369 ifa_forwardmsg(lmsg, cpu + 1);
372 static void
373 in_ialink(struct in_ifaddr *ia)
375 struct netmsg nmsg;
376 struct lwkt_msg *lmsg;
378 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_ialink_dispatch);
379 lmsg = &nmsg.nm_lmsg;
380 lmsg->u.ms_resultp = ia;
382 ifa_domsg(lmsg);
385 void
386 in_iaunlink(struct in_ifaddr *ia)
388 struct netmsg nmsg;
389 struct lwkt_msg *lmsg;
391 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iaunlink_dispatch);
392 lmsg = &nmsg.nm_lmsg;
393 lmsg->u.ms_resultp = ia;
395 ifa_domsg(lmsg);
398 void
399 in_iahash_insert(struct in_ifaddr *ia)
401 struct netmsg nmsg;
402 struct lwkt_msg *lmsg;
404 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iahashins_dispatch);
405 lmsg = &nmsg.nm_lmsg;
406 lmsg->u.ms_resultp = ia;
408 ifa_domsg(lmsg);
411 void
412 in_iahash_remove(struct in_ifaddr *ia)
414 struct netmsg nmsg;
415 struct lwkt_msg *lmsg;
417 netmsg_init(&nmsg, &curthread->td_msgport, 0, in_iahashrem_dispatch);
418 lmsg = &nmsg.nm_lmsg;
419 lmsg->u.ms_resultp = ia;
421 ifa_domsg(lmsg);
424 static __inline struct in_ifaddr *
425 in_ianext(struct in_ifaddr *oia)
427 struct ifaddr_container *ifac;
428 struct in_ifaddr_container *iac;
430 ifac = &oia->ia_ifa.ifa_containers[mycpuid];
431 ASSERT_IFAC_VALID(ifac);
432 KASSERT(ifac->ifa_listmask & IFA_LIST_IN_IFADDRHEAD,
433 ("ia is not on in_ifaddrheads\n"));
435 iac = &ifac->ifa_proto_u.u_in_ifac;
436 iac = TAILQ_NEXT(iac, ia_link);
437 if (iac != NULL)
438 return iac->ia;
439 else
440 return NULL;
443 static int
444 in_control_internal(u_long cmd, caddr_t data, struct ifnet *ifp,
445 struct thread *td)
447 struct ifreq *ifr = (struct ifreq *)data;
448 struct in_ifaddr *ia = NULL;
449 struct in_addr dst;
450 struct in_aliasreq *ifra = (struct in_aliasreq *)data;
451 struct ifaddr_container *ifac;
452 struct in_ifaddr_container *iac;
453 struct sockaddr_in oldaddr;
454 int hostIsNew, iaIsNew, maskIsNew;
455 int error = 0;
457 iaIsNew = 0;
460 * Find address for this interface, if it exists.
462 * If an alias address was specified, find that one instead of
463 * the first one on the interface, if possible
465 if (ifp) {
466 struct in_ifaddr *iap;
468 dst = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr;
469 LIST_FOREACH(iac, INADDR_HASH(dst.s_addr), ia_hash) {
470 iap = iac->ia;
471 if (iap->ia_ifp == ifp &&
472 iap->ia_addr.sin_addr.s_addr == dst.s_addr) {
473 ia = iap;
474 break;
477 if (ia == NULL) {
478 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid],
479 ifa_link) {
480 iap = ifatoia(ifac->ifa);
481 if (iap->ia_addr.sin_family == AF_INET) {
482 ia = iap;
483 break;
489 switch (cmd) {
490 case SIOCAIFADDR:
491 case SIOCDIFADDR:
492 if (ifp == NULL)
493 return (EADDRNOTAVAIL);
494 if (ifra->ifra_addr.sin_family == AF_INET) {
495 while (ia != NULL) {
496 if (ia->ia_ifp == ifp &&
497 ia->ia_addr.sin_addr.s_addr ==
498 ifra->ifra_addr.sin_addr.s_addr)
499 break;
500 ia = in_ianext(ia);
502 if ((ifp->if_flags & IFF_POINTOPOINT) &&
503 cmd == SIOCAIFADDR &&
504 ifra->ifra_dstaddr.sin_addr.s_addr == INADDR_ANY) {
505 return EDESTADDRREQ;
508 if (cmd == SIOCDIFADDR && ia == NULL)
509 return (EADDRNOTAVAIL);
510 /* FALLTHROUGH */
511 case SIOCSIFADDR:
512 case SIOCSIFNETMASK:
513 case SIOCSIFDSTADDR:
514 if (td && (error = suser(td)) != 0)
515 return error;
517 if (ifp == NULL)
518 return (EADDRNOTAVAIL);
520 if (cmd == SIOCSIFDSTADDR &&
521 (ifp->if_flags & IFF_POINTOPOINT) == 0)
522 return (EINVAL);
524 if (ia == NULL) {
525 struct ifaddr *ifa;
526 int i;
528 ia = ifa_create(sizeof(*ia), M_WAITOK);
529 ifa = &ia->ia_ifa;
532 * Setup per-CPU information
534 for (i = 0; i < ncpus; ++i) {
535 ifac = &ifa->ifa_containers[i];
536 iac = &ifac->ifa_proto_u.u_in_ifac;
537 iac->ia = ia;
538 iac->ia_ifac = ifac;
542 * Protect from NETISR_IP traversing address list
543 * while we're modifying it.
545 crit_enter();
547 in_ialink(ia);
548 ifa_iflink(ifa, ifp, 1);
550 ifa->ifa_addr = (struct sockaddr *)&ia->ia_addr;
551 ifa->ifa_dstaddr = (struct sockaddr *)&ia->ia_dstaddr;
552 ifa->ifa_netmask = (struct sockaddr *)&ia->ia_sockmask;
553 ia->ia_sockmask.sin_len = 8;
554 ia->ia_sockmask.sin_family = AF_INET;
555 if (ifp->if_flags & IFF_BROADCAST) {
556 ia->ia_broadaddr.sin_len = sizeof ia->ia_addr;
557 ia->ia_broadaddr.sin_family = AF_INET;
559 ia->ia_ifp = ifp;
560 if (!(ifp->if_flags & IFF_LOOPBACK))
561 in_interfaces++;
562 iaIsNew = 1;
564 crit_exit();
566 break;
568 case SIOCSIFBRDADDR:
569 if (td && (error = suser(td)) != 0)
570 return error;
571 /* FALLTHROUGH */
573 case SIOCGIFADDR:
574 case SIOCGIFNETMASK:
575 case SIOCGIFDSTADDR:
576 case SIOCGIFBRDADDR:
577 if (ia == NULL)
578 return (EADDRNOTAVAIL);
579 break;
582 switch (cmd) {
583 case SIOCGIFADDR:
584 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_addr;
585 return (0);
587 case SIOCGIFBRDADDR:
588 if ((ifp->if_flags & IFF_BROADCAST) == 0)
589 return (EINVAL);
590 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_broadaddr;
591 return (0);
593 case SIOCGIFDSTADDR:
594 if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
595 return (EINVAL);
596 *((struct sockaddr_in *)&ifr->ifr_dstaddr) = ia->ia_dstaddr;
597 return (0);
599 case SIOCGIFNETMASK:
600 *((struct sockaddr_in *)&ifr->ifr_addr) = ia->ia_sockmask;
601 return (0);
603 case SIOCSIFDSTADDR:
604 KKASSERT(ifp->if_flags & IFF_POINTOPOINT);
606 oldaddr = ia->ia_dstaddr;
607 ia->ia_dstaddr = *(struct sockaddr_in *)&ifr->ifr_dstaddr;
608 if (ifp->if_ioctl != NULL) {
609 lwkt_serialize_enter(ifp->if_serializer);
610 error = ifp->if_ioctl(ifp, SIOCSIFDSTADDR, (caddr_t)ia,
611 td->td_proc->p_ucred);
612 lwkt_serialize_exit(ifp->if_serializer);
613 if (error) {
614 ia->ia_dstaddr = oldaddr;
615 return (error);
618 if (ia->ia_flags & IFA_ROUTE) {
619 ia->ia_ifa.ifa_dstaddr = (struct sockaddr *)&oldaddr;
620 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
621 ia->ia_ifa.ifa_dstaddr =
622 (struct sockaddr *)&ia->ia_dstaddr;
623 rtinit(&ia->ia_ifa, RTM_ADD, RTF_HOST | RTF_UP);
625 return (0);
627 case SIOCSIFBRDADDR:
628 if ((ifp->if_flags & IFF_BROADCAST) == 0)
629 return (EINVAL);
630 ia->ia_broadaddr = *(struct sockaddr_in *)&ifr->ifr_broadaddr;
631 return (0);
633 case SIOCSIFADDR:
634 error = in_ifinit(ifp, ia,
635 (const struct sockaddr_in *)&ifr->ifr_addr, 1);
636 if (error != 0 && iaIsNew)
637 break;
638 if (error == 0)
639 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
640 return (0);
642 case SIOCSIFNETMASK:
643 ia->ia_sockmask.sin_addr = ifra->ifra_addr.sin_addr;
644 ia->ia_subnetmask = ntohl(ia->ia_sockmask.sin_addr.s_addr);
645 return (0);
647 case SIOCAIFADDR:
648 maskIsNew = 0;
649 hostIsNew = 1;
650 error = 0;
651 if (ia->ia_addr.sin_family == AF_INET) {
652 if (ifra->ifra_addr.sin_len == 0) {
653 ifra->ifra_addr = ia->ia_addr;
654 hostIsNew = 0;
655 } else if (ifra->ifra_addr.sin_addr.s_addr ==
656 ia->ia_addr.sin_addr.s_addr) {
657 hostIsNew = 0;
660 if (ifra->ifra_mask.sin_len) {
661 in_ifscrub(ifp, ia);
662 ia->ia_sockmask = ifra->ifra_mask;
663 ia->ia_sockmask.sin_family = AF_INET;
664 ia->ia_subnetmask =
665 ntohl(ia->ia_sockmask.sin_addr.s_addr);
666 maskIsNew = 1;
668 if ((ifp->if_flags & IFF_POINTOPOINT) &&
669 ifra->ifra_dstaddr.sin_family == AF_INET) {
670 in_ifscrub(ifp, ia);
671 ia->ia_dstaddr = ifra->ifra_dstaddr;
672 maskIsNew = 1; /* We lie; but the effect's the same */
674 if (ifra->ifra_addr.sin_family == AF_INET &&
675 (hostIsNew || maskIsNew))
676 error = in_ifinit(ifp, ia, &ifra->ifra_addr, 0);
678 if (error != 0 && iaIsNew)
679 break;
681 if ((ifp->if_flags & IFF_BROADCAST) &&
682 ifra->ifra_broadaddr.sin_family == AF_INET)
683 ia->ia_broadaddr = ifra->ifra_broadaddr;
684 if (error == 0)
685 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
686 return (error);
688 case SIOCDIFADDR:
690 * in_ifscrub kills the interface route.
692 in_ifscrub(ifp, ia);
694 * in_ifadown gets rid of all the rest of
695 * the routes. This is not quite the right
696 * thing to do, but at least if we are running
697 * a routing process they will come back.
699 in_ifadown(&ia->ia_ifa, 1);
700 EVENTHANDLER_INVOKE(ifaddr_event, ifp);
701 error = 0;
702 break;
704 default:
705 if (ifp == NULL || ifp->if_ioctl == NULL)
706 return (EOPNOTSUPP);
707 lwkt_serialize_enter(ifp->if_serializer);
708 error = ifp->if_ioctl(ifp, cmd, data, td->td_proc->p_ucred);
709 lwkt_serialize_exit(ifp->if_serializer);
710 return (error);
713 KKASSERT(cmd == SIOCDIFADDR ||
714 ((cmd == SIOCAIFADDR || cmd == SIOCSIFADDR) && iaIsNew));
716 ifa_ifunlink(&ia->ia_ifa, ifp);
717 in_iaunlink(ia);
719 if (cmd == SIOCDIFADDR) {
720 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
721 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
722 in_iahash_remove(ia);
724 #ifdef INVARIANTS
725 else {
727 * If cmd is SIOCSIFADDR or SIOCAIFADDR, in_ifinit() has
728 * already taken care of the deletion from hash table
730 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
731 KASSERT((ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) == 0,
732 ("SIOC%cIFADDR failed on new ia, "
733 "but the new ia is still in hash table\n",
734 cmd == SIOCSIFADDR ? 'S' : 'A'));
736 #endif
738 ifa_destroy(&ia->ia_ifa);
740 return (error);
744 * SIOC[GAD]LIFADDR.
745 * SIOCGLIFADDR: get first address. (?!?)
746 * SIOCGLIFADDR with IFLR_PREFIX:
747 * get first address that matches the specified prefix.
748 * SIOCALIFADDR: add the specified address.
749 * SIOCALIFADDR with IFLR_PREFIX:
750 * EINVAL since we can't deduce hostid part of the address.
751 * SIOCDLIFADDR: delete the specified address.
752 * SIOCDLIFADDR with IFLR_PREFIX:
753 * delete the first address that matches the specified prefix.
754 * return values:
755 * EINVAL on invalid parameters
756 * EADDRNOTAVAIL on prefix match failed/specified address not found
757 * other values may be returned from in_ioctl()
759 * NOTE! td might be NULL.
761 static int
762 in_lifaddr_ioctl(struct socket *so, u_long cmd, caddr_t data, struct ifnet *ifp,
763 struct thread *td)
765 struct if_laddrreq *iflr = (struct if_laddrreq *)data;
767 /* sanity checks */
768 if (!data || !ifp) {
769 panic("invalid argument to in_lifaddr_ioctl");
770 /*NOTRECHED*/
773 switch (cmd) {
774 case SIOCGLIFADDR:
775 /* address must be specified on GET with IFLR_PREFIX */
776 if ((iflr->flags & IFLR_PREFIX) == 0)
777 break;
778 /*FALLTHROUGH*/
779 case SIOCALIFADDR:
780 case SIOCDLIFADDR:
781 /* address must be specified on ADD and DELETE */
782 if (iflr->addr.ss_family != AF_INET)
783 return EINVAL;
784 if (iflr->addr.ss_len != sizeof(struct sockaddr_in))
785 return EINVAL;
786 /* XXX need improvement */
787 if (iflr->dstaddr.ss_family
788 && iflr->dstaddr.ss_family != AF_INET)
789 return EINVAL;
790 if (iflr->dstaddr.ss_family
791 && iflr->dstaddr.ss_len != sizeof(struct sockaddr_in))
792 return EINVAL;
793 break;
794 default: /*shouldn't happen*/
795 return EOPNOTSUPP;
797 if (sizeof(struct in_addr) * 8 < iflr->prefixlen)
798 return EINVAL;
800 switch (cmd) {
801 case SIOCALIFADDR:
803 struct in_aliasreq ifra;
805 if (iflr->flags & IFLR_PREFIX)
806 return EINVAL;
808 /* copy args to in_aliasreq, perform ioctl(SIOCAIFADDR_IN6). */
809 bzero(&ifra, sizeof ifra);
810 bcopy(iflr->iflr_name, ifra.ifra_name, sizeof ifra.ifra_name);
812 bcopy(&iflr->addr, &ifra.ifra_addr, iflr->addr.ss_len);
814 if (iflr->dstaddr.ss_family) { /*XXX*/
815 bcopy(&iflr->dstaddr, &ifra.ifra_dstaddr,
816 iflr->dstaddr.ss_len);
819 ifra.ifra_mask.sin_family = AF_INET;
820 ifra.ifra_mask.sin_len = sizeof(struct sockaddr_in);
821 in_len2mask(&ifra.ifra_mask.sin_addr, iflr->prefixlen);
823 return in_control(so, SIOCAIFADDR, (caddr_t)&ifra, ifp, td);
825 case SIOCGLIFADDR:
826 case SIOCDLIFADDR:
828 struct ifaddr_container *ifac;
829 struct in_ifaddr *ia;
830 struct in_addr mask, candidate, match;
831 struct sockaddr_in *sin;
832 int cmp;
834 bzero(&mask, sizeof mask);
835 if (iflr->flags & IFLR_PREFIX) {
836 /* lookup a prefix rather than address. */
837 in_len2mask(&mask, iflr->prefixlen);
839 sin = (struct sockaddr_in *)&iflr->addr;
840 match.s_addr = sin->sin_addr.s_addr;
841 match.s_addr &= mask.s_addr;
843 /* if you set extra bits, that's wrong */
844 if (match.s_addr != sin->sin_addr.s_addr)
845 return EINVAL;
847 cmp = 1;
848 } else {
849 if (cmd == SIOCGLIFADDR) {
850 /* on getting an address, take the 1st match */
851 match.s_addr = 0; /* gcc4 warning */
852 cmp = 0; /*XXX*/
853 } else {
854 /* on deleting an address, do exact match */
855 in_len2mask(&mask, 32);
856 sin = (struct sockaddr_in *)&iflr->addr;
857 match.s_addr = sin->sin_addr.s_addr;
859 cmp = 1;
863 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
864 struct ifaddr *ifa = ifac->ifa;
866 if (ifa->ifa_addr->sa_family != AF_INET6)
867 continue;
868 if (!cmp)
869 break;
870 candidate.s_addr =
871 ((struct sockaddr_in *)&ifa->ifa_addr)->sin_addr.s_addr;
872 candidate.s_addr &= mask.s_addr;
873 if (candidate.s_addr == match.s_addr)
874 break;
876 if (ifac == NULL)
877 return EADDRNOTAVAIL;
878 ia = (struct in_ifaddr *)(ifac->ifa);
880 if (cmd == SIOCGLIFADDR) {
881 /* fill in the if_laddrreq structure */
882 bcopy(&ia->ia_addr, &iflr->addr, ia->ia_addr.sin_len);
884 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
885 bcopy(&ia->ia_dstaddr, &iflr->dstaddr,
886 ia->ia_dstaddr.sin_len);
887 } else
888 bzero(&iflr->dstaddr, sizeof iflr->dstaddr);
890 iflr->prefixlen =
891 in_mask2len(&ia->ia_sockmask.sin_addr);
893 iflr->flags = 0; /*XXX*/
895 return 0;
896 } else {
897 struct in_aliasreq ifra;
899 /* fill in_aliasreq and do ioctl(SIOCDIFADDR_IN6) */
900 bzero(&ifra, sizeof ifra);
901 bcopy(iflr->iflr_name, ifra.ifra_name,
902 sizeof ifra.ifra_name);
904 bcopy(&ia->ia_addr, &ifra.ifra_addr,
905 ia->ia_addr.sin_len);
906 if ((ifp->if_flags & IFF_POINTOPOINT) != 0) {
907 bcopy(&ia->ia_dstaddr, &ifra.ifra_dstaddr,
908 ia->ia_dstaddr.sin_len);
910 bcopy(&ia->ia_sockmask, &ifra.ifra_dstaddr,
911 ia->ia_sockmask.sin_len);
913 return in_control(so, SIOCDIFADDR, (caddr_t)&ifra,
914 ifp, td);
919 return EOPNOTSUPP; /*just for safety*/
923 * Delete any existing route for an interface.
925 void
926 in_ifscrub(struct ifnet *ifp, struct in_ifaddr *ia)
929 if ((ia->ia_flags & IFA_ROUTE) == 0)
930 return;
931 if (ifp->if_flags & (IFF_LOOPBACK|IFF_POINTOPOINT))
932 rtinit(&ia->ia_ifa, RTM_DELETE, RTF_HOST);
933 else
934 rtinit(&ia->ia_ifa, RTM_DELETE, 0);
935 ia->ia_flags &= ~IFA_ROUTE;
939 * Initialize an interface's internet address
940 * and routing table entry.
942 static int
943 in_ifinit(struct ifnet *ifp, struct in_ifaddr *ia,
944 const struct sockaddr_in *sin, int scrub)
946 u_long i = ntohl(sin->sin_addr.s_addr);
947 struct sockaddr_in oldaddr;
948 struct ifaddr_container *ifac;
949 int flags = RTF_UP, error = 0;
950 int was_hash = 0;
952 ifac = &ia->ia_ifa.ifa_containers[mycpuid];
953 oldaddr = ia->ia_addr;
955 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH) {
956 was_hash = 1;
957 in_iahash_remove(ia);
960 ia->ia_addr = *sin;
961 if (ia->ia_addr.sin_family == AF_INET)
962 in_iahash_insert(ia);
965 * Give the interface a chance to initialize
966 * if this is its first address,
967 * and to validate the address if necessary.
969 if (ifp->if_ioctl != NULL) {
970 lwkt_serialize_enter(ifp->if_serializer);
971 error = ifp->if_ioctl(ifp, SIOCSIFADDR, (caddr_t)ia, NULL);
972 lwkt_serialize_exit(ifp->if_serializer);
973 if (error)
974 goto fail;
978 * Delete old route, if requested.
980 if (scrub) {
981 ia->ia_ifa.ifa_addr = (struct sockaddr *)&oldaddr;
982 in_ifscrub(ifp, ia);
983 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
987 * Calculate netmask/subnetmask.
989 if (IN_CLASSA(i))
990 ia->ia_netmask = IN_CLASSA_NET;
991 else if (IN_CLASSB(i))
992 ia->ia_netmask = IN_CLASSB_NET;
993 else
994 ia->ia_netmask = IN_CLASSC_NET;
996 * The subnet mask usually includes at least the standard network part,
997 * but may may be smaller in the case of supernetting.
998 * If it is set, we believe it.
1000 if (ia->ia_subnetmask == 0) {
1001 ia->ia_subnetmask = ia->ia_netmask;
1002 ia->ia_sockmask.sin_addr.s_addr = htonl(ia->ia_subnetmask);
1003 } else {
1004 ia->ia_netmask &= ia->ia_subnetmask;
1006 ia->ia_net = i & ia->ia_netmask;
1007 ia->ia_subnet = i & ia->ia_subnetmask;
1008 in_socktrim(&ia->ia_sockmask);
1011 * Add route for the network.
1013 ia->ia_ifa.ifa_metric = ifp->if_metric;
1014 if (ifp->if_flags & IFF_BROADCAST) {
1015 ia->ia_broadaddr.sin_addr.s_addr =
1016 htonl(ia->ia_subnet | ~ia->ia_subnetmask);
1017 ia->ia_netbroadcast.s_addr =
1018 htonl(ia->ia_net | ~ ia->ia_netmask);
1019 } else if (ifp->if_flags & IFF_LOOPBACK) {
1020 ia->ia_ifa.ifa_dstaddr = ia->ia_ifa.ifa_addr;
1021 flags |= RTF_HOST;
1022 } else if (ifp->if_flags & IFF_POINTOPOINT) {
1023 if (ia->ia_dstaddr.sin_family != AF_INET)
1024 return (0);
1025 flags |= RTF_HOST;
1029 * Don't add host routes for interface addresses of
1030 * 0.0.0.0 --> 0.255.255.255 netmask 255.0.0.0. This makes it
1031 * possible to assign several such address pairs with consistent
1032 * results (no host route) and is required by BOOTP.
1034 * XXX: This is ugly ! There should be a way for the caller to
1035 * say that they don't want a host route.
1037 if (ia->ia_addr.sin_addr.s_addr != INADDR_ANY ||
1038 ia->ia_netmask != IN_CLASSA_NET ||
1039 ia->ia_dstaddr.sin_addr.s_addr != htonl(IN_CLASSA_HOST)) {
1040 if ((error = rtinit(&ia->ia_ifa, RTM_ADD, flags)) != 0)
1041 goto fail;
1042 ia->ia_flags |= IFA_ROUTE;
1046 * If the interface supports multicast, join the "all hosts"
1047 * multicast group on that interface.
1049 if (ifp->if_flags & IFF_MULTICAST) {
1050 struct in_addr addr;
1052 addr.s_addr = htonl(INADDR_ALLHOSTS_GROUP);
1053 in_addmulti(&addr, ifp);
1055 return (0);
1056 fail:
1057 if (ifac->ifa_listmask & IFA_LIST_IN_IFADDRHASH)
1058 in_iahash_remove(ia);
1060 ia->ia_addr = oldaddr;
1061 if (was_hash)
1062 in_iahash_insert(ia);
1063 return (error);
1068 * Return 1 if the address might be a local broadcast address.
1071 in_broadcast(struct in_addr in, struct ifnet *ifp)
1073 struct ifaddr_container *ifac;
1074 u_long t;
1076 if (in.s_addr == INADDR_BROADCAST ||
1077 in.s_addr == INADDR_ANY)
1078 return 1;
1079 if ((ifp->if_flags & IFF_BROADCAST) == 0)
1080 return 0;
1081 t = ntohl(in.s_addr);
1083 * Look through the list of addresses for a match
1084 * with a broadcast address.
1086 #define ia ((struct in_ifaddr *)ifa)
1087 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
1088 struct ifaddr *ifa = ifac->ifa;
1090 if (ifa->ifa_addr->sa_family == AF_INET &&
1091 (in.s_addr == ia->ia_broadaddr.sin_addr.s_addr ||
1092 in.s_addr == ia->ia_netbroadcast.s_addr ||
1094 * Check for old-style (host 0) broadcast.
1096 t == ia->ia_subnet || t == ia->ia_net) &&
1098 * Check for an all one subnetmask. These
1099 * only exist when an interface gets a secondary
1100 * address.
1102 ia->ia_subnetmask != (u_long)0xffffffff)
1103 return 1;
1105 return (0);
1106 #undef ia
1109 * Add an address to the list of IP multicast addresses for a given interface.
1111 struct in_multi *
1112 in_addmulti(struct in_addr *ap, struct ifnet *ifp)
1114 struct in_multi *inm;
1115 int error;
1116 struct sockaddr_in sin;
1117 struct ifmultiaddr *ifma;
1120 * Call generic routine to add membership or increment
1121 * refcount. It wants addresses in the form of a sockaddr,
1122 * so we build one here (being careful to zero the unused bytes).
1124 bzero(&sin, sizeof sin);
1125 sin.sin_family = AF_INET;
1126 sin.sin_len = sizeof sin;
1127 sin.sin_addr = *ap;
1128 crit_enter();
1129 error = if_addmulti(ifp, (struct sockaddr *)&sin, &ifma);
1130 if (error) {
1131 crit_exit();
1132 return 0;
1136 * If ifma->ifma_protospec is null, then if_addmulti() created
1137 * a new record. Otherwise, we are done.
1139 if (ifma->ifma_protospec != 0) {
1140 crit_exit();
1141 return ifma->ifma_protospec;
1144 /* XXX - if_addmulti uses M_WAITOK. Can this really be called
1145 at interrupt time? If so, need to fix if_addmulti. XXX */
1146 inm = kmalloc(sizeof *inm, M_IPMADDR, M_WAITOK | M_ZERO);
1147 inm->inm_addr = *ap;
1148 inm->inm_ifp = ifp;
1149 inm->inm_ifma = ifma;
1150 ifma->ifma_protospec = inm;
1151 LIST_INSERT_HEAD(&in_multihead, inm, inm_link);
1154 * Let IGMP know that we have joined a new IP multicast group.
1156 igmp_joingroup(inm);
1157 crit_exit();
1158 return (inm);
1162 * Delete a multicast address record.
1164 void
1165 in_delmulti(struct in_multi *inm)
1167 struct ifmultiaddr *ifma;
1168 struct in_multi my_inm;
1170 crit_enter();
1171 ifma = inm->inm_ifma;
1172 my_inm.inm_ifp = NULL ; /* don't send the leave msg */
1173 if (ifma->ifma_refcount == 1) {
1175 * No remaining claims to this record; let IGMP know that
1176 * we are leaving the multicast group.
1177 * But do it after the if_delmulti() which might reset
1178 * the interface and nuke the packet.
1180 my_inm = *inm ;
1181 ifma->ifma_protospec = 0;
1182 LIST_REMOVE(inm, inm_link);
1183 kfree(inm, M_IPMADDR);
1185 /* XXX - should be separate API for when we have an ifma? */
1186 if_delmulti(ifma->ifma_ifp, ifma->ifma_addr);
1187 if (my_inm.inm_ifp != NULL)
1188 igmp_leavegroup(&my_inm);
1189 crit_exit();
1192 void
1193 in_ifdetach(struct ifnet *ifp)
1195 in_pcbpurgeif0(LIST_FIRST(&ripcbinfo.pcblisthead), ifp);
1196 in_pcbpurgeif0(LIST_FIRST(&udbinfo.pcblisthead), ifp);