1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * $KAME: in6.c,v 1.259 2002/01/21 11:37:50 keiichi Exp $
32 */
33
34 /*-
35 * Copyright (c) 1982, 1986, 1991, 1993
36 * The Regents of the University of California. All rights reserved.
37 *
38 * Redistribution and use in source and binary forms, with or without
39 * modification, are permitted provided that the following conditions
40 * are met:
41 * 1. Redistributions of source code must retain the above copyright
42 * notice, this list of conditions and the following disclaimer.
43 * 2. Redistributions in binary form must reproduce the above copyright
44 * notice, this list of conditions and the following disclaimer in the
45 * documentation and/or other materials provided with the distribution.
46 * 3. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 */
62
63 #include "opt_inet.h"
64 #include "opt_inet6.h"
65
66 #include <sys/param.h>
67 #include <sys/eventhandler.h>
68 #include <sys/errno.h>
69 #include <sys/jail.h>
70 #include <sys/malloc.h>
71 #include <sys/socket.h>
72 #include <sys/socketvar.h>
73 #include <sys/sockio.h>
74 #include <sys/systm.h>
75 #include <sys/priv.h>
76 #include <sys/proc.h>
77 #include <sys/time.h>
78 #include <sys/kernel.h>
79 #include <sys/lock.h>
80 #include <sys/rmlock.h>
81 #include <sys/sysctl.h>
82 #include <sys/syslog.h>
83
84 #include <net/if.h>
85 #include <net/if_var.h>
86 #include <net/if_private.h>
87 #include <net/if_types.h>
88 #include <net/if_bridgevar.h>
89 #include <net/route.h>
90 #include <net/route/route_ctl.h>
91 #include <net/route/nhop.h>
92 #include <net/if_dl.h>
93 #include <net/vnet.h>
94
95 #include <netinet/in.h>
96 #include <netinet/in_var.h>
97 #include <net/if_llatbl.h>
98 #include <netinet/if_ether.h>
99 #include <netinet/in_systm.h>
100 #include <netinet/ip.h>
101 #include <netinet/in_pcb.h>
102 #include <netinet/ip_carp.h>
103 #include <netinet/icmp6.h>
104
105 #include <netinet/ip6.h>
106 #include <netinet6/ip6_var.h>
107 #include <netinet6/nd6.h>
108 #include <netinet6/mld6_var.h>
109 #include <netinet6/ip6_mroute.h>
110 #include <netinet6/in6_ifattach.h>
111 #include <netinet6/scope6_var.h>
112 #include <netinet6/in6_fib.h>
113 #include <netinet6/in6_pcb.h>
114
115 #ifdef MAC
116 #include <security/mac/mac_framework.h>
117 #endif
118
119 /*
120 * struct in6_ifreq and struct ifreq must be type punnable for common members
121 * of ifr_ifru to allow accessors to be shared.
122 */
123 _Static_assert(offsetof(struct in6_ifreq, ifr_ifru) ==
124 offsetof(struct ifreq, ifr_ifru),
125 "struct in6_ifreq and struct ifreq are not type punnable");
126
127 VNET_DEFINE_STATIC(int, icmp6_nodeinfo_oldmcprefix) = 1;
128 #define V_icmp6_nodeinfo_oldmcprefix VNET(icmp6_nodeinfo_oldmcprefix)
129 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_NODEINFO_OLDMCPREFIX,
130 nodeinfo_oldmcprefix, CTLFLAG_VNET | CTLFLAG_RW,
131 &VNET_NAME(icmp6_nodeinfo_oldmcprefix), 0,
132 "Join old IPv6 NI group address in draft-ietf-ipngwg-icmp-name-lookup "
133 "for compatibility with KAME implementation");
134
135 VNET_DEFINE_STATIC(int, nd6_useloopback) = 1;
136 #define V_nd6_useloopback VNET(nd6_useloopback)
137 SYSCTL_INT(_net_inet6_icmp6, ICMPV6CTL_ND6_USELOOPBACK, nd6_useloopback,
138 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(nd6_useloopback), 0,
139 "Create a loopback route when configuring an IPv6 address");
140
141 /*
142 * Definitions of some costant IP6 addresses.
143 */
144 const struct in6_addr in6addr_any = IN6ADDR_ANY_INIT;
145 const struct in6_addr in6addr_loopback = IN6ADDR_LOOPBACK_INIT;
146 const struct in6_addr in6addr_nodelocal_allnodes =
147 IN6ADDR_NODELOCAL_ALLNODES_INIT;
148 const struct in6_addr in6addr_linklocal_allnodes =
149 IN6ADDR_LINKLOCAL_ALLNODES_INIT;
150 const struct in6_addr in6addr_linklocal_allrouters =
151 IN6ADDR_LINKLOCAL_ALLROUTERS_INIT;
152 const struct in6_addr in6addr_linklocal_allv2routers =
153 IN6ADDR_LINKLOCAL_ALLV2ROUTERS_INIT;
154
155 const struct in6_addr in6mask0 = IN6MASK0;
156 const struct in6_addr in6mask32 = IN6MASK32;
157 const struct in6_addr in6mask64 = IN6MASK64;
158 const struct in6_addr in6mask96 = IN6MASK96;
159 const struct in6_addr in6mask128 = IN6MASK128;
160
161 const struct sockaddr_in6 sa6_any =
162 { sizeof(sa6_any), AF_INET6, 0, 0, IN6ADDR_ANY_INIT, 0 };
163
164 static int in6_notify_ifa(struct ifnet *, struct in6_ifaddr *,
165 struct in6_aliasreq *, int);
166 static void in6_unlink_ifa(struct in6_ifaddr *, struct ifnet *);
167
168 static int in6_validate_ifra(struct ifnet *, struct in6_aliasreq *,
169 struct in6_ifaddr *, int);
170 static struct in6_ifaddr *in6_alloc_ifa(struct ifnet *,
171 struct in6_aliasreq *, int flags);
172 static int in6_update_ifa_internal(struct ifnet *, struct in6_aliasreq *,
173 struct in6_ifaddr *, int, int);
174 static int in6_broadcast_ifa(struct ifnet *, struct in6_aliasreq *,
175 struct in6_ifaddr *, int);
176
177 static void in6_join_proxy_ndp_mc(struct ifnet *, const struct in6_addr *);
178 static void in6_leave_proxy_ndp_mc(struct ifnet *, const struct in6_addr *);
179
180 #define ifa2ia6(ifa) ((struct in6_ifaddr *)(ifa))
181 #define ia62ifa(ia6) (&((ia6)->ia_ifa))
182
183 static struct sx in6_control_sx;
184 SX_SYSINIT(in6_control_sx, &in6_control_sx, "in6_control");
185
186 void
in6_newaddrmsg(struct in6_ifaddr * ia,int cmd)187 in6_newaddrmsg(struct in6_ifaddr *ia, int cmd)
188 {
189 struct rt_addrinfo info;
190 struct ifaddr *ifa;
191 struct sockaddr_dl gateway;
192 int fibnum;
193
194 ifa = &ia->ia_ifa;
195
196 /*
197 * Prepare info data for the host route.
198 * This code mimics one from ifa_maintain_loopback_route().
199 */
200 bzero(&info, sizeof(struct rt_addrinfo));
201 info.rti_flags = ifa->ifa_flags | RTF_HOST | RTF_STATIC | RTF_PINNED;
202 info.rti_info[RTAX_DST] = ifa->ifa_addr;
203 info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&gateway;
204 link_init_sdl(ifa->ifa_ifp, (struct sockaddr *)&gateway, ifa->ifa_ifp->if_type);
205 if (cmd != RTM_DELETE)
206 info.rti_ifp = V_loif;
207
208 fibnum = ia62ifa(ia)->ifa_ifp->if_fib;
209
210 if (cmd == RTM_ADD) {
211 rt_addrmsg(cmd, &ia->ia_ifa, fibnum);
212 rt_routemsg_info(cmd, &info, fibnum);
213 } else if (cmd == RTM_DELETE) {
214 rt_routemsg_info(cmd, &info, fibnum);
215 rt_addrmsg(cmd, &ia->ia_ifa, fibnum);
216 }
217 }
218
219 int
in6_mask2len(struct in6_addr * mask,u_char * lim0)220 in6_mask2len(struct in6_addr *mask, u_char *lim0)
221 {
222 int x = 0, y;
223 u_char *lim = lim0, *p;
224
225 /* ignore the scope_id part */
226 if (lim0 == NULL || lim0 - (u_char *)mask > sizeof(*mask))
227 lim = (u_char *)mask + sizeof(*mask);
228 for (p = (u_char *)mask; p < lim; x++, p++) {
229 if (*p != 0xff)
230 break;
231 }
232 y = 0;
233 if (p < lim) {
234 for (y = 0; y < 8; y++) {
235 if ((*p & (0x80 >> y)) == 0)
236 break;
237 }
238 }
239
240 /*
241 * when the limit pointer is given, do a stricter check on the
242 * remaining bits.
243 */
244 if (p < lim) {
245 if (y != 0 && (*p & (0x00ff >> y)) != 0)
246 return (-1);
247 for (p = p + 1; p < lim; p++)
248 if (*p != 0)
249 return (-1);
250 }
251
252 return x * 8 + y;
253 }
254
255 #ifdef COMPAT_FREEBSD32
256 struct in6_ndifreq32 {
257 char ifname[IFNAMSIZ];
258 uint32_t ifindex;
259 };
260 #define SIOCGDEFIFACE32_IN6 _IOWR('i', 86, struct in6_ndifreq32)
261 #endif
262
263 int
in6_control_ioctl(u_long cmd,void * data,struct ifnet * ifp,struct ucred * cred)264 in6_control_ioctl(u_long cmd, void *data,
265 struct ifnet *ifp, struct ucred *cred)
266 {
267 struct in6_ifreq *ifr = (struct in6_ifreq *)data;
268 struct in6_ifaddr *ia = NULL;
269 struct in6_aliasreq *ifra = (struct in6_aliasreq *)data;
270 struct sockaddr_in6 *sa6;
271 int error;
272 bool control_locked = false;
273
274 /*
275 * Compat to make pre-10.x ifconfig(8) operable.
276 */
277 if (cmd == OSIOCAIFADDR_IN6) {
278 cmd = SIOCAIFADDR_IN6;
279 ifra->ifra_vhid = 0;
280 }
281
282 switch (cmd) {
283 case SIOCGETSGCNT_IN6:
284 case SIOCGETMIFCNT_IN6:
285 /*
286 * XXX mrt_ioctl has a 3rd, unused, FIB argument in route.c.
287 * We cannot see how that would be needed, so do not adjust the
288 * KPI blindly; more likely should clean up the IPv4 variant.
289 */
290 return (mrt6_ioctl ? mrt6_ioctl(cmd, data) : EOPNOTSUPP);
291 }
292
293 switch (cmd) {
294 case SIOCAADDRCTL_POLICY:
295 case SIOCDADDRCTL_POLICY:
296 if (cred != NULL) {
297 error = priv_check_cred(cred, PRIV_NETINET_ADDRCTRL6);
298 if (error)
299 return (error);
300 }
301 return (in6_src_ioctl(cmd, data));
302 }
303
304 if (ifp == NULL)
305 return (EOPNOTSUPP);
306
307 switch (cmd) {
308 case SIOCSNDFLUSH_IN6:
309 case SIOCSPFXFLUSH_IN6:
310 case SIOCSRTRFLUSH_IN6:
311 case SIOCSDEFIFACE_IN6:
312 case SIOCSIFINFO_FLAGS:
313 case SIOCSIFINFO_IN6:
314 if (cred != NULL) {
315 error = priv_check_cred(cred, PRIV_NETINET_ND6);
316 if (error)
317 return (error);
318 }
319 /* FALLTHROUGH */
320 case OSIOCGIFINFO_IN6:
321 case SIOCGIFINFO_IN6:
322 case SIOCGNBRINFO_IN6:
323 case SIOCGDEFIFACE_IN6:
324 return (nd6_ioctl(cmd, data, ifp));
325
326 #ifdef COMPAT_FREEBSD32
327 case SIOCGDEFIFACE32_IN6:
328 {
329 struct in6_ndifreq ndif;
330 struct in6_ndifreq32 *ndif32;
331
332 error = nd6_ioctl(SIOCGDEFIFACE_IN6, (caddr_t)&ndif,
333 ifp);
334 if (error)
335 return (error);
336 ndif32 = (struct in6_ndifreq32 *)data;
337 ndif32->ifindex = ndif.ifindex;
338 return (0);
339 }
340 #endif
341 }
342
343 switch (cmd) {
344 case SIOCSIFPREFIX_IN6:
345 case SIOCDIFPREFIX_IN6:
346 case SIOCAIFPREFIX_IN6:
347 case SIOCCIFPREFIX_IN6:
348 case SIOCSGIFPREFIX_IN6:
349 case SIOCGIFPREFIX_IN6:
350 log(LOG_NOTICE,
351 "prefix ioctls are now invalidated. "
352 "please use ifconfig.\n");
353 return (EOPNOTSUPP);
354 }
355
356 switch (cmd) {
357 case SIOCSSCOPE6:
358 if (cred != NULL) {
359 error = priv_check_cred(cred, PRIV_NETINET_SCOPE6);
360 if (error)
361 return (error);
362 }
363 /* FALLTHROUGH */
364 case SIOCGSCOPE6:
365 case SIOCGSCOPE6DEF:
366 return (scope6_ioctl(cmd, data, ifp));
367 }
368
369 /*
370 * Find address for this interface, if it exists.
371 *
372 * In netinet code, we have checked ifra_addr in SIOCSIF*ADDR operation
373 * only, and used the first interface address as the target of other
374 * operations (without checking ifra_addr). This was because netinet
375 * code/API assumed at most 1 interface address per interface.
376 * Since IPv6 allows a node to assign multiple addresses
377 * on a single interface, we almost always look and check the
378 * presence of ifra_addr, and reject invalid ones here.
379 * It also decreases duplicated code among SIOC*_IN6 operations.
380 */
381 switch (cmd) {
382 case SIOCAIFADDR_IN6:
383 case SIOCSIFPHYADDR_IN6:
384 sa6 = &ifra->ifra_addr;
385 break;
386 case SIOCSIFADDR_IN6:
387 case SIOCGIFADDR_IN6:
388 case SIOCSIFDSTADDR_IN6:
389 case SIOCSIFNETMASK_IN6:
390 case SIOCGIFDSTADDR_IN6:
391 case SIOCGIFNETMASK_IN6:
392 case SIOCDIFADDR_IN6:
393 case SIOCGIFPSRCADDR_IN6:
394 case SIOCGIFPDSTADDR_IN6:
395 case SIOCGIFAFLAG_IN6:
396 case SIOCSNDFLUSH_IN6:
397 case SIOCSPFXFLUSH_IN6:
398 case SIOCSRTRFLUSH_IN6:
399 case SIOCGIFALIFETIME_IN6:
400 case SIOCGIFSTAT_IN6:
401 case SIOCGIFSTAT_ICMP6:
402 sa6 = &ifr->ifr_addr;
403 break;
404 case SIOCSIFADDR:
405 case SIOCSIFBRDADDR:
406 case SIOCSIFDSTADDR:
407 case SIOCSIFNETMASK:
408 /*
409 * Although we should pass any non-INET6 ioctl requests
410 * down to driver, we filter some legacy INET requests.
411 * Drivers trust SIOCSIFADDR et al to come from an already
412 * privileged layer, and do not perform any credentials
413 * checks or input validation.
414 */
415 return (EINVAL);
416 default:
417 sa6 = NULL;
418 break;
419 }
420 if (sa6 && sa6->sin6_family == AF_INET6) {
421 if (sa6->sin6_scope_id != 0)
422 error = sa6_embedscope(sa6, 0);
423 else
424 error = in6_setscope(&sa6->sin6_addr, ifp, NULL);
425 if (error != 0)
426 return (error);
427 if (cred != NULL && (error = prison_check_ip6(cred,
428 &sa6->sin6_addr)) != 0)
429 return (error);
430 sx_xlock(&in6_control_sx);
431 control_locked = true;
432 ia = in6ifa_ifpwithaddr(ifp, &sa6->sin6_addr);
433 } else
434 ia = NULL;
435
436 switch (cmd) {
437 case SIOCSIFADDR_IN6:
438 case SIOCSIFDSTADDR_IN6:
439 case SIOCSIFNETMASK_IN6:
440 /*
441 * Since IPv6 allows a node to assign multiple addresses
442 * on a single interface, SIOCSIFxxx ioctls are deprecated.
443 */
444 /* we decided to obsolete this command (20000704) */
445 error = EINVAL;
446 goto out;
447
448 case SIOCDIFADDR_IN6:
449 /*
450 * for IPv4, we look for existing in_ifaddr here to allow
451 * "ifconfig if0 delete" to remove the first IPv4 address on
452 * the interface. For IPv6, as the spec allows multiple
453 * interface address from the day one, we consider "remove the
454 * first one" semantics to be not preferable.
455 */
456 if (ia == NULL) {
457 error = EADDRNOTAVAIL;
458 goto out;
459 }
460 /* FALLTHROUGH */
461 case SIOCAIFADDR_IN6:
462 /*
463 * We always require users to specify a valid IPv6 address for
464 * the corresponding operation.
465 */
466 if (ifra->ifra_addr.sin6_family != AF_INET6 ||
467 ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6)) {
468 error = EAFNOSUPPORT;
469 goto out;
470 }
471
472 if (cred != NULL) {
473 error = priv_check_cred(cred, (cmd == SIOCDIFADDR_IN6) ?
474 PRIV_NET_DELIFADDR : PRIV_NET_ADDIFADDR);
475 if (error)
476 goto out;
477 }
478 /* FALLTHROUGH */
479 case SIOCGIFSTAT_IN6:
480 case SIOCGIFSTAT_ICMP6:
481 if (ifp->if_inet6 == NULL) {
482 error = EPFNOSUPPORT;
483 goto out;
484 }
485 break;
486
487 case SIOCGIFADDR_IN6:
488 /* This interface is basically deprecated. use SIOCGIFCONF. */
489 /* FALLTHROUGH */
490 case SIOCGIFAFLAG_IN6:
491 case SIOCGIFNETMASK_IN6:
492 case SIOCGIFDSTADDR_IN6:
493 case SIOCGIFALIFETIME_IN6:
494 /* must think again about its semantics */
495 if (ia == NULL) {
496 error = EADDRNOTAVAIL;
497 goto out;
498 }
499 break;
500 }
501
502 switch (cmd) {
503 case SIOCGIFADDR_IN6:
504 ifr->ifr_addr = ia->ia_addr;
505 if ((error = sa6_recoverscope(&ifr->ifr_addr)) != 0)
506 goto out;
507 break;
508
509 case SIOCGIFDSTADDR_IN6:
510 if ((ifp->if_flags & IFF_POINTOPOINT) == 0) {
511 error = EINVAL;
512 goto out;
513 }
514 ifr->ifr_dstaddr = ia->ia_dstaddr;
515 if ((error = sa6_recoverscope(&ifr->ifr_dstaddr)) != 0)
516 goto out;
517 break;
518
519 case SIOCGIFNETMASK_IN6:
520 ifr->ifr_addr = ia->ia_prefixmask;
521 break;
522
523 case SIOCGIFAFLAG_IN6:
524 ifr->ifr_ifru.ifru_flags6 = ia->ia6_flags;
525 break;
526
527 case SIOCGIFSTAT_IN6:
528 COUNTER_ARRAY_COPY(ifp->if_inet6->in6_ifstat,
529 &ifr->ifr_ifru.ifru_stat,
530 sizeof(struct in6_ifstat) / sizeof(uint64_t));
531 break;
532
533 case SIOCGIFSTAT_ICMP6:
534 COUNTER_ARRAY_COPY(ifp->if_inet6->icmp6_ifstat,
535 &ifr->ifr_ifru.ifru_icmp6stat,
536 sizeof(struct icmp6_ifstat) / sizeof(uint64_t));
537 break;
538
539 case SIOCGIFALIFETIME_IN6:
540 ifr->ifr_ifru.ifru_lifetime = ia->ia6_lifetime;
541 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
542 time_t maxexpire;
543 struct in6_addrlifetime *retlt =
544 &ifr->ifr_ifru.ifru_lifetime;
545
546 /*
547 * XXX: adjust expiration time assuming time_t is
548 * signed.
549 */
550 maxexpire = (-1) &
551 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
552 if (ia->ia6_lifetime.ia6t_vltime <
553 maxexpire - ia->ia6_updatetime) {
554 retlt->ia6t_expire = ia->ia6_updatetime +
555 ia->ia6_lifetime.ia6t_vltime;
556 } else
557 retlt->ia6t_expire = maxexpire;
558 }
559 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
560 time_t maxexpire;
561 struct in6_addrlifetime *retlt =
562 &ifr->ifr_ifru.ifru_lifetime;
563
564 /*
565 * XXX: adjust expiration time assuming time_t is
566 * signed.
567 */
568 maxexpire = (-1) &
569 ~((time_t)1 << ((sizeof(maxexpire) * 8) - 1));
570 if (ia->ia6_lifetime.ia6t_pltime <
571 maxexpire - ia->ia6_updatetime) {
572 retlt->ia6t_preferred = ia->ia6_updatetime +
573 ia->ia6_lifetime.ia6t_pltime;
574 } else
575 retlt->ia6t_preferred = maxexpire;
576 }
577 break;
578
579 case SIOCAIFADDR_IN6:
580 #ifdef MAC
581 /* Check if a MAC policy disallows setting the IPv6 address. */
582 error = mac_inet6_check_add_addr(cred, &sa6->sin6_addr, ifp);
583 if (error != 0)
584 goto out;
585 #endif
586 error = in6_addifaddr(ifp, ifra, ia);
587 ia = NULL;
588 goto out;
589
590 case SIOCDIFADDR_IN6:
591 in6_purgeifaddr(ia);
592 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
593 IFADDR_EVENT_DEL);
594 break;
595
596 default:
597 if (ifp->if_ioctl == NULL) {
598 error = EOPNOTSUPP;
599 goto out;
600 }
601 error = (*ifp->if_ioctl)(ifp, cmd, data);
602 goto out;
603 }
604
605 error = 0;
606 out:
607 if (control_locked)
608 sx_xunlock(&in6_control_sx);
609
610 if (ia != NULL)
611 ifa_free(&ia->ia_ifa);
612 return (error);
613 }
614
615 int
in6_control(struct socket * so,u_long cmd,void * data,struct ifnet * ifp,struct thread * td)616 in6_control(struct socket *so, u_long cmd, void *data,
617 struct ifnet *ifp, struct thread *td)
618 {
619 return (in6_control_ioctl(cmd, data, ifp, td ? td->td_ucred : NULL));
620 }
621
622 static struct in6_multi_mship *
in6_joingroup_legacy(struct ifnet * ifp,const struct in6_addr * mcaddr,int * errorp,int delay)623 in6_joingroup_legacy(struct ifnet *ifp, const struct in6_addr *mcaddr,
624 int *errorp, int delay)
625 {
626 struct in6_multi_mship *imm;
627 int error;
628
629 imm = malloc(sizeof(*imm), M_IP6MADDR, M_NOWAIT);
630 if (imm == NULL) {
631 *errorp = ENOBUFS;
632 return (NULL);
633 }
634
635 delay = (delay * MLD_FASTHZ) / hz;
636
637 error = in6_joingroup(ifp, mcaddr, NULL, &imm->i6mm_maddr, delay);
638 if (error) {
639 *errorp = error;
640 free(imm, M_IP6MADDR);
641 return (NULL);
642 }
643
644 return (imm);
645 }
646
647 static int
in6_solicited_node_maddr(struct in6_addr * maddr,struct ifnet * ifp,const struct in6_addr * base)648 in6_solicited_node_maddr(struct in6_addr *maddr,
649 struct ifnet *ifp, const struct in6_addr *base)
650 {
651 int error;
652
653 bzero(maddr, sizeof(struct in6_addr));
654 maddr->s6_addr32[0] = IPV6_ADDR_INT32_MLL;
655 maddr->s6_addr32[2] = htonl(1);
656 maddr->s6_addr32[3] = base->s6_addr32[3];
657 maddr->s6_addr8[12] = 0xff;
658 if ((error = in6_setscope(maddr, ifp, NULL)) != 0) {
659 /* XXX: should not happen */
660 log(LOG_ERR, "%s: in6_setscope failed\n", __func__);
661 }
662
663 return error;
664 }
665
666 /*
667 * Join necessary multicast groups. Factored out from in6_update_ifa().
668 * This entire work should only be done once, for the default FIB.
669 */
670 static int
in6_update_ifa_join_mc(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia,int flags,struct in6_multi ** in6m_sol)671 in6_update_ifa_join_mc(struct ifnet *ifp, struct in6_aliasreq *ifra,
672 struct in6_ifaddr *ia, int flags, struct in6_multi **in6m_sol)
673 {
674 char ip6buf[INET6_ADDRSTRLEN];
675 struct in6_addr mltaddr;
676 struct in6_multi_mship *imm;
677 int delay, error;
678
679 KASSERT(in6m_sol != NULL, ("%s: in6m_sol is NULL", __func__));
680
681 /* Join solicited multicast addr for new host id. */
682 if ((error = in6_solicited_node_maddr(&mltaddr, ifp,
683 &ifra->ifra_addr.sin6_addr)) != 0)
684 goto cleanup;
685 delay = error = 0;
686 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
687 /*
688 * We need a random delay for DAD on the address being
689 * configured. It also means delaying transmission of the
690 * corresponding MLD report to avoid report collision.
691 * [RFC 4861, Section 6.3.7]
692 */
693 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
694 }
695 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay);
696 if (imm == NULL) {
697 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
698 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
699 if_name(ifp), error));
700 goto cleanup;
701 }
702 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
703 *in6m_sol = imm->i6mm_maddr;
704
705 /*
706 * Join link-local all-nodes address.
707 */
708 mltaddr = in6addr_linklocal_allnodes;
709 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
710 goto cleanup; /* XXX: should not fail */
711
712 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0);
713 if (imm == NULL) {
714 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
715 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf, &mltaddr),
716 if_name(ifp), error));
717 goto cleanup;
718 }
719 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
720
721 /*
722 * Join node information group address.
723 */
724 delay = 0;
725 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
726 /*
727 * The spec does not say anything about delay for this group,
728 * but the same logic should apply.
729 */
730 delay = arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz);
731 }
732 if (in6_nigroup(ifp, NULL, -1, &mltaddr) == 0) {
733 /* XXX jinmei */
734 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay);
735 if (imm == NULL)
736 nd6log((LOG_WARNING,
737 "%s: in6_joingroup failed for %s on %s "
738 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
739 &mltaddr), if_name(ifp), error));
740 /* XXX not very fatal, go on... */
741 else
742 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
743 }
744 if (V_icmp6_nodeinfo_oldmcprefix &&
745 in6_nigroup_oldmcprefix(ifp, NULL, -1, &mltaddr) == 0) {
746 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, delay);
747 if (imm == NULL)
748 nd6log((LOG_WARNING,
749 "%s: in6_joingroup failed for %s on %s "
750 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
751 &mltaddr), if_name(ifp), error));
752 /* XXX not very fatal, go on... */
753 else
754 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
755 }
756
757 /*
758 * Join interface-local all-nodes address.
759 * (ff01::1%ifN, and ff01::%ifN/32)
760 */
761 mltaddr = in6addr_nodelocal_allnodes;
762 if ((error = in6_setscope(&mltaddr, ifp, NULL)) != 0)
763 goto cleanup; /* XXX: should not fail */
764
765 imm = in6_joingroup_legacy(ifp, &mltaddr, &error, 0);
766 if (imm == NULL) {
767 nd6log((LOG_WARNING, "%s: in6_joingroup failed for %s on %s "
768 "(errno=%d)\n", __func__, ip6_sprintf(ip6buf,
769 &mltaddr), if_name(ifp), error));
770 goto cleanup;
771 }
772 LIST_INSERT_HEAD(&ia->ia6_memberships, imm, i6mm_chain);
773
774 cleanup:
775 return (error);
776 }
777
778 /*
779 * Update parameters of an IPv6 interface address.
780 * If necessary, a new entry is created and linked into address chains.
781 * This function is separated from in6_control().
782 */
783 int
in6_update_ifa(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia,int flags)784 in6_update_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
785 struct in6_ifaddr *ia, int flags)
786 {
787 int error, hostIsNew = 0;
788
789 if ((error = in6_validate_ifra(ifp, ifra, ia, flags)) != 0)
790 return (error);
791
792 if (ia == NULL) {
793 hostIsNew = 1;
794 if ((ia = in6_alloc_ifa(ifp, ifra, flags)) == NULL)
795 return (ENOBUFS);
796 }
797
798 error = in6_update_ifa_internal(ifp, ifra, ia, hostIsNew, flags);
799 if (error != 0) {
800 if (hostIsNew != 0) {
801 in6_unlink_ifa(ia, ifp);
802 ifa_free(&ia->ia_ifa);
803 }
804 return (error);
805 }
806
807 if (hostIsNew)
808 error = in6_broadcast_ifa(ifp, ifra, ia, flags);
809
810 return (error);
811 }
812
813 /*
814 * Fill in basic IPv6 address request info.
815 */
816 void
in6_prepare_ifra(struct in6_aliasreq * ifra,const struct in6_addr * addr,const struct in6_addr * mask)817 in6_prepare_ifra(struct in6_aliasreq *ifra, const struct in6_addr *addr,
818 const struct in6_addr *mask)
819 {
820
821 memset(ifra, 0, sizeof(struct in6_aliasreq));
822
823 ifra->ifra_addr.sin6_family = AF_INET6;
824 ifra->ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
825 if (addr != NULL)
826 ifra->ifra_addr.sin6_addr = *addr;
827
828 ifra->ifra_prefixmask.sin6_family = AF_INET6;
829 ifra->ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
830 if (mask != NULL)
831 ifra->ifra_prefixmask.sin6_addr = *mask;
832 }
833
834 static int
in6_validate_ifra(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia,int flags)835 in6_validate_ifra(struct ifnet *ifp, struct in6_aliasreq *ifra,
836 struct in6_ifaddr *ia, int flags)
837 {
838 int plen = -1;
839 struct sockaddr_in6 dst6;
840 struct in6_addrlifetime *lt;
841 char ip6buf[INET6_ADDRSTRLEN];
842
843 /* Validate parameters */
844 if (ifp == NULL || ifra == NULL) /* this maybe redundant */
845 return (EINVAL);
846
847 /*
848 * The destination address for a p2p link must have a family
849 * of AF_UNSPEC or AF_INET6.
850 */
851 if ((ifp->if_flags & IFF_POINTOPOINT) != 0 &&
852 ifra->ifra_dstaddr.sin6_family != AF_INET6 &&
853 ifra->ifra_dstaddr.sin6_family != AF_UNSPEC)
854 return (EAFNOSUPPORT);
855
856 /*
857 * Validate address
858 */
859 if (ifra->ifra_addr.sin6_len != sizeof(struct sockaddr_in6) ||
860 ifra->ifra_addr.sin6_family != AF_INET6)
861 return (EINVAL);
862
863 /*
864 * validate ifra_prefixmask. don't check sin6_family, netmask
865 * does not carry fields other than sin6_len.
866 */
867 if (ifra->ifra_prefixmask.sin6_len > sizeof(struct sockaddr_in6))
868 return (EINVAL);
869 /*
870 * Because the IPv6 address architecture is classless, we require
871 * users to specify a (non 0) prefix length (mask) for a new address.
872 * We also require the prefix (when specified) mask is valid, and thus
873 * reject a non-consecutive mask.
874 */
875 if (ia == NULL && ifra->ifra_prefixmask.sin6_len == 0)
876 return (EINVAL);
877 if (ifra->ifra_prefixmask.sin6_len != 0) {
878 plen = in6_mask2len(&ifra->ifra_prefixmask.sin6_addr,
879 (u_char *)&ifra->ifra_prefixmask +
880 ifra->ifra_prefixmask.sin6_len);
881 if (plen <= 0)
882 return (EINVAL);
883 } else {
884 /*
885 * In this case, ia must not be NULL. We just use its prefix
886 * length.
887 */
888 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL);
889 }
890 /*
891 * If the destination address on a p2p interface is specified,
892 * and the address is a scoped one, validate/set the scope
893 * zone identifier.
894 */
895 dst6 = ifra->ifra_dstaddr;
896 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) != 0 &&
897 (dst6.sin6_family == AF_INET6)) {
898 struct in6_addr in6_tmp;
899 u_int32_t zoneid;
900
901 in6_tmp = dst6.sin6_addr;
902 if (in6_setscope(&in6_tmp, ifp, &zoneid))
903 return (EINVAL); /* XXX: should be impossible */
904
905 if (dst6.sin6_scope_id != 0) {
906 if (dst6.sin6_scope_id != zoneid)
907 return (EINVAL);
908 } else /* user omit to specify the ID. */
909 dst6.sin6_scope_id = zoneid;
910
911 /* convert into the internal form */
912 if (sa6_embedscope(&dst6, 0))
913 return (EINVAL); /* XXX: should be impossible */
914 }
915 /* Modify original ifra_dstaddr to reflect changes */
916 ifra->ifra_dstaddr = dst6;
917
918 /*
919 * The destination address can be specified only for a p2p or a
920 * loopback interface. If specified, the corresponding prefix length
921 * must be 128.
922 */
923 if (ifra->ifra_dstaddr.sin6_family == AF_INET6) {
924 if ((ifp->if_flags & (IFF_POINTOPOINT|IFF_LOOPBACK)) == 0) {
925 /* XXX: noisy message */
926 nd6log((LOG_INFO, "in6_update_ifa: a destination can "
927 "be specified for a p2p or a loopback IF only\n"));
928 return (EINVAL);
929 }
930 if (plen != 128) {
931 nd6log((LOG_INFO, "in6_update_ifa: prefixlen should "
932 "be 128 when dstaddr is specified\n"));
933 return (EINVAL);
934 }
935 }
936 /* lifetime consistency check */
937 lt = &ifra->ifra_lifetime;
938 if (lt->ia6t_pltime > lt->ia6t_vltime)
939 return (EINVAL);
940 if (lt->ia6t_vltime == 0) {
941 /*
942 * the following log might be noisy, but this is a typical
943 * configuration mistake or a tool's bug.
944 */
945 nd6log((LOG_INFO,
946 "in6_update_ifa: valid lifetime is 0 for %s\n",
947 ip6_sprintf(ip6buf, &ifra->ifra_addr.sin6_addr)));
948
949 if (ia == NULL)
950 return (0); /* there's nothing to do */
951 }
952
953 /* Check prefix mask */
954 if (ia != NULL && ifra->ifra_prefixmask.sin6_len != 0) {
955 /*
956 * We prohibit changing the prefix length of an existing
957 * address, because
958 * + such an operation should be rare in IPv6, and
959 * + the operation would confuse prefix management.
960 */
961 if (ia->ia_prefixmask.sin6_len != 0 &&
962 in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL) != plen) {
963 nd6log((LOG_INFO, "in6_validate_ifa: the prefix length "
964 "of an existing %s address should not be changed\n",
965 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
966
967 return (EINVAL);
968 }
969 }
970
971 return (0);
972 }
973
974 /*
975 * Allocate a new ifaddr and link it into chains.
976 */
977 static struct in6_ifaddr *
in6_alloc_ifa(struct ifnet * ifp,struct in6_aliasreq * ifra,int flags)978 in6_alloc_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra, int flags)
979 {
980 struct in6_ifaddr *ia;
981
982 /*
983 * When in6_alloc_ifa() is called in a process of a received
984 * RA, it is called under an interrupt context. So, we should
985 * call malloc with M_NOWAIT.
986 */
987 ia = (struct in6_ifaddr *)ifa_alloc(sizeof(*ia), M_NOWAIT);
988 if (ia == NULL)
989 return (NULL);
990 LIST_INIT(&ia->ia6_memberships);
991 /* Initialize the address and masks, and put time stamp */
992 ia->ia_ifa.ifa_addr = (struct sockaddr *)&ia->ia_addr;
993 ia->ia_addr.sin6_family = AF_INET6;
994 ia->ia_addr.sin6_len = sizeof(ia->ia_addr);
995 /* XXX: Can we assign ,sin6_addr and skip the rest? */
996 ia->ia_addr = ifra->ifra_addr;
997 ia->ia6_createtime = time_uptime;
998 if ((ifp->if_flags & (IFF_POINTOPOINT | IFF_LOOPBACK)) != 0) {
999 /*
1000 * Some functions expect that ifa_dstaddr is not
1001 * NULL for p2p interfaces.
1002 */
1003 ia->ia_ifa.ifa_dstaddr =
1004 (struct sockaddr *)&ia->ia_dstaddr;
1005 } else {
1006 ia->ia_ifa.ifa_dstaddr = NULL;
1007 }
1008
1009 /* set prefix mask if any */
1010 ia->ia_ifa.ifa_netmask = (struct sockaddr *)&ia->ia_prefixmask;
1011 if (ifra->ifra_prefixmask.sin6_len != 0) {
1012 ia->ia_prefixmask.sin6_family = AF_INET6;
1013 ia->ia_prefixmask.sin6_len = ifra->ifra_prefixmask.sin6_len;
1014 ia->ia_prefixmask.sin6_addr = ifra->ifra_prefixmask.sin6_addr;
1015 }
1016
1017 ia->ia_ifp = ifp;
1018 ifa_ref(&ia->ia_ifa); /* if_addrhead */
1019 IF_ADDR_WLOCK(ifp);
1020 CK_STAILQ_INSERT_TAIL(&ifp->if_addrhead, &ia->ia_ifa, ifa_link);
1021 IF_ADDR_WUNLOCK(ifp);
1022
1023 ifa_ref(&ia->ia_ifa); /* in6_ifaddrhead */
1024 IN6_IFADDR_WLOCK();
1025 CK_STAILQ_INSERT_TAIL(&V_in6_ifaddrhead, ia, ia_link);
1026 CK_LIST_INSERT_HEAD(IN6ADDR_HASH(&ia->ia_addr.sin6_addr), ia, ia6_hash);
1027 IN6_IFADDR_WUNLOCK();
1028
1029 return (ia);
1030 }
1031
1032 /*
1033 * Update/configure interface address parameters:
1034 *
1035 * 1) Update lifetime
1036 * 2) Update interface metric ad flags
1037 * 3) Notify other subsystems
1038 */
1039 static int
in6_update_ifa_internal(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia,int hostIsNew,int flags)1040 in6_update_ifa_internal(struct ifnet *ifp, struct in6_aliasreq *ifra,
1041 struct in6_ifaddr *ia, int hostIsNew, int flags)
1042 {
1043 int error;
1044
1045 /* update timestamp */
1046 ia->ia6_updatetime = time_uptime;
1047
1048 /*
1049 * Set lifetimes. We do not refer to ia6t_expire and ia6t_preferred
1050 * to see if the address is deprecated or invalidated, but initialize
1051 * these members for applications.
1052 */
1053 ia->ia6_lifetime = ifra->ifra_lifetime;
1054 if (ia->ia6_lifetime.ia6t_vltime != ND6_INFINITE_LIFETIME) {
1055 ia->ia6_lifetime.ia6t_expire =
1056 time_uptime + ia->ia6_lifetime.ia6t_vltime;
1057 } else
1058 ia->ia6_lifetime.ia6t_expire = 0;
1059 if (ia->ia6_lifetime.ia6t_pltime != ND6_INFINITE_LIFETIME) {
1060 ia->ia6_lifetime.ia6t_preferred =
1061 time_uptime + ia->ia6_lifetime.ia6t_pltime;
1062 } else
1063 ia->ia6_lifetime.ia6t_preferred = 0;
1064
1065 /*
1066 * backward compatibility - if IN6_IFF_DEPRECATED is set from the
1067 * userland, make it deprecated.
1068 */
1069 if ((ifra->ifra_flags & IN6_IFF_DEPRECATED) != 0) {
1070 ia->ia6_lifetime.ia6t_pltime = 0;
1071 ia->ia6_lifetime.ia6t_preferred = time_uptime;
1072 }
1073
1074 /*
1075 * configure address flags.
1076 */
1077 ia->ia6_flags = ifra->ifra_flags;
1078
1079 /*
1080 * Make the address tentative before joining multicast addresses,
1081 * so that corresponding MLD responses would not have a tentative
1082 * source address.
1083 */
1084 ia->ia6_flags &= ~IN6_IFF_DUPLICATED; /* safety */
1085
1086 /*
1087 * DAD should be performed for an new address or addresses on
1088 * an interface with ND6_IFF_IFDISABLED.
1089 */
1090 if (in6if_do_dad(ifp) &&
1091 (hostIsNew || (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)))
1092 ia->ia6_flags |= IN6_IFF_TENTATIVE;
1093
1094 /* notify other subsystems */
1095 error = in6_notify_ifa(ifp, ia, ifra, hostIsNew);
1096
1097 return (error);
1098 }
1099
1100 /*
1101 * Do link-level ifa job:
1102 * 1) Add lle entry for added address
1103 * 2) Notifies routing socket users about new address
1104 * 3) join appropriate multicast group
1105 * 4) start DAD if enabled
1106 */
1107 static int
in6_broadcast_ifa(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia,int flags)1108 in6_broadcast_ifa(struct ifnet *ifp, struct in6_aliasreq *ifra,
1109 struct in6_ifaddr *ia, int flags)
1110 {
1111 struct in6_multi *in6m_sol;
1112 int error = 0;
1113
1114 /* Add local address to lltable, if necessary (ex. on p2p link). */
1115 if ((error = nd6_add_ifa_lle(ia)) != 0) {
1116 in6_purgeaddr(&ia->ia_ifa);
1117 ifa_free(&ia->ia_ifa);
1118 return (error);
1119 }
1120
1121 /* Join necessary multicast groups. */
1122 in6m_sol = NULL;
1123 if ((ifp->if_flags & IFF_MULTICAST) != 0) {
1124 error = in6_update_ifa_join_mc(ifp, ifra, ia, flags, &in6m_sol);
1125 if (error != 0) {
1126 in6_purgeaddr(&ia->ia_ifa);
1127 ifa_free(&ia->ia_ifa);
1128 return (error);
1129 }
1130 }
1131
1132 /* Perform DAD, if the address is TENTATIVE. */
1133 if ((ia->ia6_flags & IN6_IFF_TENTATIVE)) {
1134 int delay, mindelay, maxdelay;
1135
1136 delay = 0;
1137 if ((flags & IN6_IFAUPDATE_DADDELAY)) {
1138 /*
1139 * We need to impose a delay before sending an NS
1140 * for DAD. Check if we also needed a delay for the
1141 * corresponding MLD message. If we did, the delay
1142 * should be larger than the MLD delay (this could be
1143 * relaxed a bit, but this simple logic is at least
1144 * safe).
1145 * XXX: Break data hiding guidelines and look at
1146 * state for the solicited multicast group.
1147 */
1148 mindelay = 0;
1149 if (in6m_sol != NULL &&
1150 in6m_sol->in6m_state == MLD_REPORTING_MEMBER) {
1151 mindelay = in6m_sol->in6m_timer;
1152 }
1153 maxdelay = MAX_RTR_SOLICITATION_DELAY * hz;
1154 if (maxdelay - mindelay == 0)
1155 delay = 0;
1156 else {
1157 delay =
1158 (arc4random() % (maxdelay - mindelay)) +
1159 mindelay;
1160 }
1161 }
1162 nd6_dad_start((struct ifaddr *)ia, delay);
1163 }
1164
1165 in6_newaddrmsg(ia, RTM_ADD);
1166 ifa_free(&ia->ia_ifa);
1167 return (error);
1168 }
1169
1170 /*
1171 * Adds or deletes interface route for p2p ifa.
1172 * Returns 0 on success or errno.
1173 */
1174 static int
in6_handle_dstaddr_rtrequest(int cmd,struct in6_ifaddr * ia)1175 in6_handle_dstaddr_rtrequest(int cmd, struct in6_ifaddr *ia)
1176 {
1177 struct epoch_tracker et;
1178 struct ifaddr *ifa = &ia->ia_ifa;
1179 int error;
1180
1181 /* Prepare gateway */
1182 struct sockaddr_dl_short sdl = {
1183 .sdl_family = AF_LINK,
1184 .sdl_len = sizeof(struct sockaddr_dl_short),
1185 .sdl_type = ifa->ifa_ifp->if_type,
1186 .sdl_index = ifa->ifa_ifp->if_index,
1187 };
1188
1189 struct sockaddr_in6 dst = {
1190 .sin6_family = AF_INET6,
1191 .sin6_len = sizeof(struct sockaddr_in6),
1192 .sin6_addr = ia->ia_dstaddr.sin6_addr,
1193 };
1194
1195 struct rt_addrinfo info = {
1196 .rti_ifa = ifa,
1197 .rti_ifp = ifa->ifa_ifp,
1198 .rti_flags = RTF_PINNED | RTF_HOST,
1199 .rti_info = {
1200 [RTAX_DST] = (struct sockaddr *)&dst,
1201 [RTAX_GATEWAY] = (struct sockaddr *)&sdl,
1202 },
1203 };
1204 /* Don't set additional per-gw filters on removal */
1205
1206 NET_EPOCH_ENTER(et);
1207 error = rib_handle_ifaddr_info(ifa->ifa_ifp->if_fib, cmd, &info);
1208 NET_EPOCH_EXIT(et);
1209
1210 return (error);
1211 }
1212
1213 static bool
ifa_is_p2p(struct in6_ifaddr * ia)1214 ifa_is_p2p(struct in6_ifaddr *ia)
1215 {
1216 int plen;
1217
1218 plen = in6_mask2len(&ia->ia_prefixmask.sin6_addr, NULL); /* XXX */
1219
1220 if ((plen == 128) && (ia->ia_dstaddr.sin6_family == AF_INET6) &&
1221 !IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &ia->ia_dstaddr.sin6_addr))
1222 return (true);
1223
1224 return (false);
1225 }
1226
1227 int
in6_addifaddr(struct ifnet * ifp,struct in6_aliasreq * ifra,struct in6_ifaddr * ia)1228 in6_addifaddr(struct ifnet *ifp, struct in6_aliasreq *ifra, struct in6_ifaddr *ia)
1229 {
1230 struct nd_prefixctl pr0;
1231 struct nd_prefix *pr;
1232 int carp_attached = 0;
1233 int error;
1234
1235 /*
1236 * Check if bridge wants to allow adding addrs to member interfaces.
1237 */
1238 if (ifp->if_bridge != NULL && ifp->if_type != IFT_GIF &&
1239 bridge_member_ifaddrs_p != NULL) {
1240 if (bridge_member_ifaddrs_p()) {
1241 if_printf(ifp, "WARNING: Assigning an IP address to "
1242 "an interface which is also a bridge member is "
1243 "deprecated and will be unsupported in a future "
1244 "release.\n");
1245 } else {
1246 error = EINVAL;
1247 goto out;
1248 }
1249 }
1250
1251 /*
1252 * first, make or update the interface address structure,
1253 * and link it to the list.
1254 */
1255 if ((error = in6_update_ifa(ifp, ifra, ia, 0)) != 0)
1256 goto out;
1257 if (ia != NULL) {
1258 if (ia->ia_ifa.ifa_carp)
1259 (*carp_detach_p)(&ia->ia_ifa, true);
1260 ifa_free(&ia->ia_ifa);
1261 }
1262 if ((ia = in6ifa_ifpwithaddr(ifp, &ifra->ifra_addr.sin6_addr)) == NULL) {
1263 /*
1264 * this can happen when the user specify the 0 valid
1265 * lifetime.
1266 */
1267 return (0);
1268 }
1269
1270 if (ifra->ifra_vhid > 0) {
1271 if (carp_attach_p != NULL)
1272 error = (*carp_attach_p)(&ia->ia_ifa,
1273 ifra->ifra_vhid);
1274 else
1275 error = EPROTONOSUPPORT;
1276 if (error)
1277 goto out;
1278 else
1279 carp_attached = 1;
1280 }
1281
1282 /*
1283 * then, make the prefix on-link on the interface.
1284 * XXX: we'd rather create the prefix before the address, but
1285 * we need at least one address to install the corresponding
1286 * interface route, so we configure the address first.
1287 */
1288
1289 /*
1290 * convert mask to prefix length (prefixmask has already
1291 * been validated in in6_update_ifa().
1292 */
1293 bzero(&pr0, sizeof(pr0));
1294 pr0.ndpr_ifp = ifp;
1295 pr0.ndpr_plen = ia->ia_plen =
1296 in6_mask2len(&ifra->ifra_prefixmask.sin6_addr, NULL);
1297 if (pr0.ndpr_plen == 128) {
1298 /* we don't need to install a host route. */
1299 goto aifaddr_out;
1300 }
1301 pr0.ndpr_prefix = ifra->ifra_addr;
1302 /* apply the mask for safety. */
1303 IN6_MASK_ADDR(&pr0.ndpr_prefix.sin6_addr,
1304 &ifra->ifra_prefixmask.sin6_addr);
1305
1306 /*
1307 * XXX: since we don't have an API to set prefix (not address)
1308 * lifetimes, we just use the same lifetimes as addresses.
1309 * The (temporarily) installed lifetimes can be overridden by
1310 * later advertised RAs (when accept_rtadv is non 0), which is
1311 * an intended behavior.
1312 */
1313 pr0.ndpr_raf_onlink = 1; /* should be configurable? */
1314 pr0.ndpr_raf_auto =
1315 ((ifra->ifra_flags & IN6_IFF_AUTOCONF) != 0);
1316 pr0.ndpr_vltime = ifra->ifra_lifetime.ia6t_vltime;
1317 pr0.ndpr_pltime = ifra->ifra_lifetime.ia6t_pltime;
1318
1319 /* add the prefix if not yet. */
1320 if ((pr = nd6_prefix_lookup(&pr0)) == NULL) {
1321 /*
1322 * nd6_prelist_add will install the corresponding
1323 * interface route.
1324 */
1325 if ((error = nd6_prelist_add(&pr0, NULL, &pr)) != 0) {
1326 if (carp_attached)
1327 (*carp_detach_p)(&ia->ia_ifa, false);
1328 goto out;
1329 }
1330 }
1331
1332 /* relate the address to the prefix */
1333 if (ia->ia6_ndpr == NULL) {
1334 ia->ia6_ndpr = pr;
1335 pr->ndpr_addrcnt++;
1336
1337 /*
1338 * If this is the first autoconf address from the
1339 * prefix, create a temporary address as well
1340 * (when required).
1341 */
1342 if ((ia->ia6_flags & IN6_IFF_AUTOCONF) &&
1343 V_ip6_use_tempaddr && pr->ndpr_addrcnt == 1) {
1344 int e;
1345 if ((e = in6_tmpifadd(ia, 1, 0)) != 0) {
1346 log(LOG_NOTICE, "in6_control: failed "
1347 "to create a temporary address, "
1348 "errno=%d\n", e);
1349 }
1350 }
1351 }
1352 nd6_prefix_rele(pr);
1353
1354 /*
1355 * this might affect the status of autoconfigured addresses,
1356 * that is, this address might make other addresses detached.
1357 */
1358 pfxlist_onlink_check();
1359
1360 aifaddr_out:
1361 /*
1362 * Try to clear the flag when a new IPv6 address is added
1363 * onto an IFDISABLED interface and it succeeds.
1364 */
1365 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED) {
1366 struct in6_ndireq nd;
1367
1368 memset(&nd, 0, sizeof(nd));
1369 nd.ndi.flags = ND_IFINFO(ifp)->flags;
1370 nd.ndi.flags &= ~ND6_IFF_IFDISABLED;
1371 if (nd6_ioctl(SIOCSIFINFO_FLAGS, (caddr_t)&nd, ifp) < 0)
1372 log(LOG_NOTICE, "SIOCAIFADDR_IN6: "
1373 "SIOCSIFINFO_FLAGS for -ifdisabled "
1374 "failed.");
1375 /*
1376 * Ignore failure of clearing the flag intentionally.
1377 * The failure means address duplication was detected.
1378 */
1379 }
1380 error = 0;
1381
1382 out:
1383 if (ia != NULL)
1384 ifa_free(&ia->ia_ifa);
1385 return (error);
1386 }
1387
1388 void
in6_purgeaddr(struct ifaddr * ifa)1389 in6_purgeaddr(struct ifaddr *ifa)
1390 {
1391 struct ifnet *ifp = ifa->ifa_ifp;
1392 struct in6_ifaddr *ia = (struct in6_ifaddr *) ifa;
1393 struct in6_multi_mship *imm;
1394 int error;
1395
1396 if (ifa->ifa_carp)
1397 (*carp_detach_p)(ifa, false);
1398
1399 /*
1400 * Remove the loopback route to the interface address.
1401 * The check for the current setting of "nd6_useloopback"
1402 * is not needed.
1403 */
1404 if (ia->ia_flags & IFA_RTSELF) {
1405 error = ifa_del_loopback_route((struct ifaddr *)ia,
1406 (struct sockaddr *)&ia->ia_addr);
1407 if (error == 0)
1408 ia->ia_flags &= ~IFA_RTSELF;
1409 }
1410
1411 /* stop DAD processing */
1412 nd6_dad_stop(ifa);
1413
1414 /* Leave multicast groups. */
1415 while ((imm = LIST_FIRST(&ia->ia6_memberships)) != NULL) {
1416 LIST_REMOVE(imm, i6mm_chain);
1417 if (imm->i6mm_maddr != NULL)
1418 in6_leavegroup(imm->i6mm_maddr, NULL);
1419 free(imm, M_IP6MADDR);
1420 }
1421 /* Check if we need to remove p2p route */
1422 if ((ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) {
1423 error = in6_handle_dstaddr_rtrequest(RTM_DELETE, ia);
1424 if (error != 0)
1425 log(LOG_INFO, "%s: err=%d, destination address delete "
1426 "failed\n", __func__, error);
1427 ia->ia_flags &= ~IFA_ROUTE;
1428 }
1429
1430 in6_newaddrmsg(ia, RTM_DELETE);
1431 in6_unlink_ifa(ia, ifp);
1432 }
1433
1434 /*
1435 * Removes @ia from the corresponding interfaces and unlinks corresponding
1436 * prefix if no addresses are using it anymore.
1437 */
1438 void
in6_purgeifaddr(struct in6_ifaddr * ia)1439 in6_purgeifaddr(struct in6_ifaddr *ia)
1440 {
1441 struct nd_prefix *pr;
1442
1443 /*
1444 * If the address being deleted is the only one that owns
1445 * the corresponding prefix, expire the prefix as well.
1446 * XXX: theoretically, we don't have to worry about such
1447 * relationship, since we separate the address management
1448 * and the prefix management. We do this, however, to provide
1449 * as much backward compatibility as possible in terms of
1450 * the ioctl operation.
1451 * Note that in6_purgeaddr() will decrement ndpr_addrcnt.
1452 */
1453 pr = ia->ia6_ndpr;
1454 in6_purgeaddr(&ia->ia_ifa);
1455 if (pr != NULL && pr->ndpr_addrcnt == 0) {
1456 ND6_WLOCK();
1457 nd6_prefix_unlink(pr, NULL);
1458 ND6_WUNLOCK();
1459 nd6_prefix_del(pr);
1460 }
1461 }
1462
1463
1464 static void
in6_unlink_ifa(struct in6_ifaddr * ia,struct ifnet * ifp)1465 in6_unlink_ifa(struct in6_ifaddr *ia, struct ifnet *ifp)
1466 {
1467 char ip6buf[INET6_ADDRSTRLEN];
1468 int remove_lle;
1469
1470 IF_ADDR_WLOCK(ifp);
1471 CK_STAILQ_REMOVE(&ifp->if_addrhead, &ia->ia_ifa, ifaddr, ifa_link);
1472 IF_ADDR_WUNLOCK(ifp);
1473 ifa_free(&ia->ia_ifa); /* if_addrhead */
1474
1475 /*
1476 * Defer the release of what might be the last reference to the
1477 * in6_ifaddr so that it can't be freed before the remainder of the
1478 * cleanup.
1479 */
1480 IN6_IFADDR_WLOCK();
1481 CK_STAILQ_REMOVE(&V_in6_ifaddrhead, ia, in6_ifaddr, ia_link);
1482 CK_LIST_REMOVE(ia, ia6_hash);
1483 IN6_IFADDR_WUNLOCK();
1484
1485 /*
1486 * Release the reference to the base prefix. There should be a
1487 * positive reference.
1488 */
1489 remove_lle = 0;
1490 if (ia->ia6_ndpr != NULL) {
1491 ia->ia6_ndpr->ndpr_addrcnt--;
1492 /* Do not delete lles within prefix if refcont != 0 */
1493 if (ia->ia6_ndpr->ndpr_addrcnt == 0)
1494 remove_lle = 1;
1495 ia->ia6_ndpr = NULL;
1496 } else if (ia->ia_plen < 128) {
1497 nd6log((LOG_NOTICE,
1498 "in6_unlink_ifa: autoconf'ed address "
1499 "%s has no prefix\n", ip6_sprintf(ip6buf, IA6_IN6(ia))));
1500 }
1501
1502 nd6_rem_ifa_lle(ia, remove_lle);
1503
1504 /*
1505 * Also, if the address being removed is autoconf'ed, call
1506 * pfxlist_onlink_check() since the release might affect the status of
1507 * other (detached) addresses.
1508 */
1509 if ((ia->ia6_flags & IN6_IFF_AUTOCONF)) {
1510 pfxlist_onlink_check();
1511 }
1512 ifa_free(&ia->ia_ifa); /* in6_ifaddrhead */
1513 }
1514
1515 /*
1516 * Notifies other subsystems about address change/arrival:
1517 * 1) Notifies device handler on the first IPv6 address assignment
1518 * 2) Handle routing table changes for P2P links and route
1519 * 3) Handle routing table changes for address host route
1520 */
1521 static int
in6_notify_ifa(struct ifnet * ifp,struct in6_ifaddr * ia,struct in6_aliasreq * ifra,int hostIsNew)1522 in6_notify_ifa(struct ifnet *ifp, struct in6_ifaddr *ia,
1523 struct in6_aliasreq *ifra, int hostIsNew)
1524 {
1525 int error = 0, ifacount = 0;
1526 struct ifaddr *ifa;
1527 struct sockaddr_in6 *pdst;
1528 char ip6buf[INET6_ADDRSTRLEN];
1529
1530 /*
1531 * Give the interface a chance to initialize
1532 * if this is its first address,
1533 */
1534 if (hostIsNew != 0) {
1535 struct epoch_tracker et;
1536
1537 NET_EPOCH_ENTER(et);
1538 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1539 if (ifa->ifa_addr->sa_family != AF_INET6)
1540 continue;
1541 ifacount++;
1542 }
1543 NET_EPOCH_EXIT(et);
1544 }
1545
1546 if (ifacount <= 1 && ifp->if_ioctl) {
1547 error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, (caddr_t)ia);
1548 if (error)
1549 goto done;
1550 }
1551
1552 /*
1553 * If a new destination address is specified, scrub the old one and
1554 * install the new destination. Note that the interface must be
1555 * p2p or loopback.
1556 */
1557 pdst = &ifra->ifra_dstaddr;
1558 if (pdst->sin6_family == AF_INET6 &&
1559 !IN6_ARE_ADDR_EQUAL(&pdst->sin6_addr, &ia->ia_dstaddr.sin6_addr)) {
1560 if ((ia->ia_flags & IFA_ROUTE) != 0 &&
1561 (in6_handle_dstaddr_rtrequest(RTM_DELETE, ia) != 0)) {
1562 nd6log((LOG_ERR, "in6_update_ifa_internal: failed to "
1563 "remove a route to the old destination: %s\n",
1564 ip6_sprintf(ip6buf, &ia->ia_addr.sin6_addr)));
1565 /* proceed anyway... */
1566 } else
1567 ia->ia_flags &= ~IFA_ROUTE;
1568 ia->ia_dstaddr = *pdst;
1569 }
1570
1571 /*
1572 * If a new destination address is specified for a point-to-point
1573 * interface, install a route to the destination as an interface
1574 * direct route.
1575 * XXX: the logic below rejects assigning multiple addresses on a p2p
1576 * interface that share the same destination.
1577 */
1578 if (!(ia->ia_flags & IFA_ROUTE) && ifa_is_p2p(ia)) {
1579 error = in6_handle_dstaddr_rtrequest(RTM_ADD, ia);
1580 if (error)
1581 goto done;
1582 ia->ia_flags |= IFA_ROUTE;
1583 }
1584
1585 /*
1586 * add a loopback route to self if not exists
1587 */
1588 if (!(ia->ia_flags & IFA_RTSELF) && V_nd6_useloopback) {
1589 error = ifa_add_loopback_route((struct ifaddr *)ia,
1590 (struct sockaddr *)&ia->ia_addr);
1591 if (error == 0)
1592 ia->ia_flags |= IFA_RTSELF;
1593 }
1594 done:
1595 WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
1596 "Invoking IPv6 network device address event may sleep");
1597
1598 ifa_ref(&ia->ia_ifa);
1599 EVENTHANDLER_INVOKE(ifaddr_event_ext, ifp, &ia->ia_ifa,
1600 IFADDR_EVENT_ADD);
1601 ifa_free(&ia->ia_ifa);
1602
1603 return (error);
1604 }
1605
1606 /*
1607 * Find an IPv6 interface link-local address specific to an interface.
1608 * ifaddr is returned referenced.
1609 */
1610 struct in6_ifaddr *
in6ifa_ifpforlinklocal(struct ifnet * ifp,int ignoreflags)1611 in6ifa_ifpforlinklocal(struct ifnet *ifp, int ignoreflags)
1612 {
1613 struct ifaddr *ifa;
1614
1615 NET_EPOCH_ASSERT();
1616
1617 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1618 if (ifa->ifa_addr->sa_family != AF_INET6)
1619 continue;
1620 if (IN6_IS_ADDR_LINKLOCAL(IFA_IN6(ifa))) {
1621 if ((((struct in6_ifaddr *)ifa)->ia6_flags &
1622 ignoreflags) != 0)
1623 continue;
1624 ifa_ref(ifa);
1625 break;
1626 }
1627 }
1628
1629 return ((struct in6_ifaddr *)ifa);
1630 }
1631
1632 /*
1633 * find the interface address corresponding to a given IPv6 address.
1634 * ifaddr is returned referenced if @referenced flag is set.
1635 */
1636 struct in6_ifaddr *
in6ifa_ifwithaddr(const struct in6_addr * addr,uint32_t zoneid,bool referenced)1637 in6ifa_ifwithaddr(const struct in6_addr *addr, uint32_t zoneid, bool referenced)
1638 {
1639 struct rm_priotracker in6_ifa_tracker;
1640 struct in6_ifaddr *ia;
1641
1642 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1643 CK_LIST_FOREACH(ia, IN6ADDR_HASH(addr), ia6_hash) {
1644 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), addr)) {
1645 if (zoneid != 0 &&
1646 zoneid != ia->ia_addr.sin6_scope_id)
1647 continue;
1648 if (referenced)
1649 ifa_ref(&ia->ia_ifa);
1650 break;
1651 }
1652 }
1653 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1654 return (ia);
1655 }
1656
1657 /*
1658 * find the internet address corresponding to a given interface and address.
1659 * ifaddr is returned referenced.
1660 */
1661 struct in6_ifaddr *
in6ifa_ifpwithaddr(struct ifnet * ifp,const struct in6_addr * addr)1662 in6ifa_ifpwithaddr(struct ifnet *ifp, const struct in6_addr *addr)
1663 {
1664 struct epoch_tracker et;
1665 struct ifaddr *ifa;
1666
1667 NET_EPOCH_ENTER(et);
1668 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1669 if (ifa->ifa_addr->sa_family != AF_INET6)
1670 continue;
1671 if (IN6_ARE_ADDR_EQUAL(addr, IFA_IN6(ifa))) {
1672 ifa_ref(ifa);
1673 break;
1674 }
1675 }
1676 NET_EPOCH_EXIT(et);
1677
1678 return ((struct in6_ifaddr *)ifa);
1679 }
1680
1681 /*
1682 * Find a link-local scoped address on ifp and return it if any.
1683 */
1684 struct in6_ifaddr *
in6ifa_llaonifp(struct ifnet * ifp)1685 in6ifa_llaonifp(struct ifnet *ifp)
1686 {
1687 struct epoch_tracker et;
1688 struct sockaddr_in6 *sin6;
1689 struct ifaddr *ifa;
1690
1691 if (ND_IFINFO(ifp)->flags & ND6_IFF_IFDISABLED)
1692 return (NULL);
1693 NET_EPOCH_ENTER(et);
1694 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1695 if (ifa->ifa_addr->sa_family != AF_INET6)
1696 continue;
1697 sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
1698 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr) ||
1699 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6->sin6_addr) ||
1700 IN6_IS_ADDR_MC_NODELOCAL(&sin6->sin6_addr))
1701 break;
1702 }
1703 NET_EPOCH_EXIT(et);
1704
1705 return ((struct in6_ifaddr *)ifa);
1706 }
1707
1708 /*
1709 * Convert IP6 address to printable (loggable) representation. Caller
1710 * has to make sure that ip6buf is at least INET6_ADDRSTRLEN long.
1711 */
1712 static char digits[] = "0123456789abcdef";
1713 char *
ip6_sprintf(char * ip6buf,const struct in6_addr * addr)1714 ip6_sprintf(char *ip6buf, const struct in6_addr *addr)
1715 {
1716 int i, cnt = 0, maxcnt = 0, idx = 0, index = 0;
1717 char *cp;
1718 const u_int16_t *a = (const u_int16_t *)addr;
1719 const u_int8_t *d;
1720 int dcolon = 0, zero = 0;
1721
1722 cp = ip6buf;
1723
1724 for (i = 0; i < 8; i++) {
1725 if (*(a + i) == 0) {
1726 cnt++;
1727 if (cnt == 1)
1728 idx = i;
1729 }
1730 else if (maxcnt < cnt) {
1731 maxcnt = cnt;
1732 index = idx;
1733 cnt = 0;
1734 }
1735 }
1736 if (maxcnt < cnt) {
1737 maxcnt = cnt;
1738 index = idx;
1739 }
1740
1741 for (i = 0; i < 8; i++) {
1742 if (dcolon == 1) {
1743 if (*a == 0) {
1744 if (i == 7)
1745 *cp++ = ':';
1746 a++;
1747 continue;
1748 } else
1749 dcolon = 2;
1750 }
1751 if (*a == 0) {
1752 if (dcolon == 0 && *(a + 1) == 0 && i == index) {
1753 if (i == 0)
1754 *cp++ = ':';
1755 *cp++ = ':';
1756 dcolon = 1;
1757 } else {
1758 *cp++ = '0';
1759 *cp++ = ':';
1760 }
1761 a++;
1762 continue;
1763 }
1764 d = (const u_char *)a;
1765 /* Try to eliminate leading zeros in printout like in :0001. */
1766 zero = 1;
1767 *cp = digits[*d >> 4];
1768 if (*cp != '0') {
1769 zero = 0;
1770 cp++;
1771 }
1772 *cp = digits[*d++ & 0xf];
1773 if (zero == 0 || (*cp != '0')) {
1774 zero = 0;
1775 cp++;
1776 }
1777 *cp = digits[*d >> 4];
1778 if (zero == 0 || (*cp != '0')) {
1779 zero = 0;
1780 cp++;
1781 }
1782 *cp++ = digits[*d & 0xf];
1783 *cp++ = ':';
1784 a++;
1785 }
1786 *--cp = '\0';
1787 return (ip6buf);
1788 }
1789
1790 int
in6_localaddr(struct in6_addr * in6)1791 in6_localaddr(struct in6_addr *in6)
1792 {
1793 struct rm_priotracker in6_ifa_tracker;
1794 struct in6_ifaddr *ia;
1795
1796 if (IN6_IS_ADDR_LOOPBACK(in6) || IN6_IS_ADDR_LINKLOCAL(in6))
1797 return 1;
1798
1799 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1800 CK_STAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
1801 if (IN6_ARE_MASKED_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr,
1802 &ia->ia_prefixmask.sin6_addr)) {
1803 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1804 return 1;
1805 }
1806 }
1807 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1808
1809 return (0);
1810 }
1811
1812 /*
1813 * Return 1 if an internet address is for the local host and configured
1814 * on one of its interfaces.
1815 */
1816 int
in6_localip(struct in6_addr * in6)1817 in6_localip(struct in6_addr *in6)
1818 {
1819 struct rm_priotracker in6_ifa_tracker;
1820 struct in6_ifaddr *ia;
1821
1822 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1823 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1824 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr)) {
1825 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1826 return (1);
1827 }
1828 }
1829 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1830 return (0);
1831 }
1832
1833 /*
1834 * Like in6_localip(), but FIB-aware and carp(4)-aware.
1835 */
1836 bool
in6_localip_fib(struct in6_addr * in6,uint16_t fib)1837 in6_localip_fib(struct in6_addr *in6, uint16_t fib)
1838 {
1839 struct rm_priotracker in6_ifa_tracker;
1840 struct in6_ifaddr *ia;
1841
1842 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1843 CK_LIST_FOREACH(ia, IN6ADDR_HASH(in6), ia6_hash) {
1844 if (IN6_ARE_ADDR_EQUAL(in6, &ia->ia_addr.sin6_addr) &&
1845 (ia->ia_ifa.ifa_carp == NULL ||
1846 carp_master_p(&ia->ia_ifa)) &&
1847 ia->ia_ifa.ifa_ifp->if_fib == fib) {
1848 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1849 return (true);
1850 }
1851 }
1852 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1853 return (false);
1854 }
1855
1856 /*
1857 * Return 1 if an internet address is configured on an interface.
1858 */
1859 int
in6_ifhasaddr(struct ifnet * ifp,struct in6_addr * addr)1860 in6_ifhasaddr(struct ifnet *ifp, struct in6_addr *addr)
1861 {
1862 struct in6_addr in6;
1863 struct ifaddr *ifa;
1864 struct in6_ifaddr *ia6;
1865
1866 NET_EPOCH_ASSERT();
1867
1868 in6 = *addr;
1869 if (in6_clearscope(&in6))
1870 return (0);
1871 in6_setscope(&in6, ifp, NULL);
1872
1873 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1874 if (ifa->ifa_addr->sa_family != AF_INET6)
1875 continue;
1876 ia6 = (struct in6_ifaddr *)ifa;
1877 if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &in6))
1878 return (1);
1879 }
1880
1881 return (0);
1882 }
1883
1884 int
in6_is_addr_deprecated(struct sockaddr_in6 * sa6)1885 in6_is_addr_deprecated(struct sockaddr_in6 *sa6)
1886 {
1887 struct rm_priotracker in6_ifa_tracker;
1888 struct in6_ifaddr *ia;
1889
1890 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
1891 CK_LIST_FOREACH(ia, IN6ADDR_HASH(&sa6->sin6_addr), ia6_hash) {
1892 if (IN6_ARE_ADDR_EQUAL(IA6_IN6(ia), &sa6->sin6_addr)) {
1893 if (ia->ia6_flags & IN6_IFF_DEPRECATED) {
1894 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1895 return (1); /* true */
1896 }
1897 break;
1898 }
1899 }
1900 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
1901
1902 return (0); /* false */
1903 }
1904
1905 /*
1906 * return length of part which dst and src are equal
1907 * hard coding...
1908 */
1909 int
in6_matchlen(struct in6_addr * src,struct in6_addr * dst)1910 in6_matchlen(struct in6_addr *src, struct in6_addr *dst)
1911 {
1912 int match = 0;
1913 u_char *s = (u_char *)src, *d = (u_char *)dst;
1914 u_char *lim = s + 16, r;
1915
1916 while (s < lim)
1917 if ((r = (*d++ ^ *s++)) != 0) {
1918 while (r < 128) {
1919 match++;
1920 r <<= 1;
1921 }
1922 break;
1923 } else
1924 match += 8;
1925 return match;
1926 }
1927
1928 /* XXX: to be scope conscious */
1929 int
in6_are_prefix_equal(struct in6_addr * p1,struct in6_addr * p2,int len)1930 in6_are_prefix_equal(struct in6_addr *p1, struct in6_addr *p2, int len)
1931 {
1932 int bytelen, bitlen;
1933
1934 /* sanity check */
1935 if (0 > len || len > 128) {
1936 log(LOG_ERR, "in6_are_prefix_equal: invalid prefix length(%d)\n",
1937 len);
1938 return (0);
1939 }
1940
1941 bytelen = len / 8;
1942 bitlen = len % 8;
1943
1944 if (bcmp(&p1->s6_addr, &p2->s6_addr, bytelen))
1945 return (0);
1946 if (bitlen != 0 &&
1947 p1->s6_addr[bytelen] >> (8 - bitlen) !=
1948 p2->s6_addr[bytelen] >> (8 - bitlen))
1949 return (0);
1950
1951 return (1);
1952 }
1953
1954 void
in6_prefixlen2mask(struct in6_addr * maskp,int len)1955 in6_prefixlen2mask(struct in6_addr *maskp, int len)
1956 {
1957 u_char maskarray[8] = {0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff};
1958 int bytelen, bitlen, i;
1959
1960 /* sanity check */
1961 if (0 > len || len > 128) {
1962 log(LOG_ERR, "in6_prefixlen2mask: invalid prefix length(%d)\n",
1963 len);
1964 return;
1965 }
1966
1967 bzero(maskp, sizeof(*maskp));
1968 bytelen = len / 8;
1969 bitlen = len % 8;
1970 for (i = 0; i < bytelen; i++)
1971 maskp->s6_addr[i] = 0xff;
1972 if (bitlen)
1973 maskp->s6_addr[bytelen] = maskarray[bitlen - 1];
1974 }
1975
1976 /*
1977 * return the best address out of the same scope. if no address was
1978 * found, return the first valid address from designated IF.
1979 */
1980 struct in6_ifaddr *
in6_ifawithifp(struct ifnet * ifp,struct in6_addr * dst)1981 in6_ifawithifp(struct ifnet *ifp, struct in6_addr *dst)
1982 {
1983 int dst_scope = in6_addrscope(dst), blen = -1, tlen;
1984 struct ifaddr *ifa;
1985 struct in6_ifaddr *besta = NULL;
1986 struct in6_ifaddr *dep[2]; /* last-resort: deprecated */
1987
1988 NET_EPOCH_ASSERT();
1989
1990 dep[0] = dep[1] = NULL;
1991
1992 /*
1993 * We first look for addresses in the same scope.
1994 * If there is one, return it.
1995 * If two or more, return one which matches the dst longest.
1996 * If none, return one of global addresses assigned other ifs.
1997 */
1998 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
1999 if (ifa->ifa_addr->sa_family != AF_INET6)
2000 continue;
2001 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2002 continue; /* XXX: is there any case to allow anycast? */
2003 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2004 continue; /* don't use this interface */
2005 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2006 continue;
2007 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2008 if (V_ip6_use_deprecated)
2009 dep[0] = (struct in6_ifaddr *)ifa;
2010 continue;
2011 }
2012
2013 if (dst_scope == in6_addrscope(IFA_IN6(ifa))) {
2014 /*
2015 * call in6_matchlen() as few as possible
2016 */
2017 if (besta) {
2018 if (blen == -1)
2019 blen = in6_matchlen(&besta->ia_addr.sin6_addr, dst);
2020 tlen = in6_matchlen(IFA_IN6(ifa), dst);
2021 if (tlen > blen) {
2022 blen = tlen;
2023 besta = (struct in6_ifaddr *)ifa;
2024 }
2025 } else
2026 besta = (struct in6_ifaddr *)ifa;
2027 }
2028 }
2029 if (besta)
2030 return (besta);
2031
2032 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2033 if (ifa->ifa_addr->sa_family != AF_INET6)
2034 continue;
2035 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_ANYCAST)
2036 continue; /* XXX: is there any case to allow anycast? */
2037 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_NOTREADY)
2038 continue; /* don't use this interface */
2039 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DETACHED)
2040 continue;
2041 if (((struct in6_ifaddr *)ifa)->ia6_flags & IN6_IFF_DEPRECATED) {
2042 if (V_ip6_use_deprecated)
2043 dep[1] = (struct in6_ifaddr *)ifa;
2044 continue;
2045 }
2046
2047 return (struct in6_ifaddr *)ifa;
2048 }
2049
2050 /* use the last-resort values, that are, deprecated addresses */
2051 if (dep[0])
2052 return dep[0];
2053 if (dep[1])
2054 return dep[1];
2055
2056 return NULL;
2057 }
2058
2059 /*
2060 * perform DAD when interface becomes IFF_UP.
2061 */
2062 void
in6_if_up(struct ifnet * ifp)2063 in6_if_up(struct ifnet *ifp)
2064 {
2065 struct epoch_tracker et;
2066 struct ifaddr *ifa;
2067 struct in6_ifaddr *ia;
2068
2069 NET_EPOCH_ENTER(et);
2070 CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
2071 if (ifa->ifa_addr->sa_family != AF_INET6)
2072 continue;
2073 ia = (struct in6_ifaddr *)ifa;
2074 if (ia->ia6_flags & IN6_IFF_TENTATIVE) {
2075 /*
2076 * The TENTATIVE flag was likely set by hand
2077 * beforehand, implicitly indicating the need for DAD.
2078 * We may be able to skip the random delay in this
2079 * case, but we impose delays just in case.
2080 */
2081 nd6_dad_start(ifa,
2082 arc4random() % (MAX_RTR_SOLICITATION_DELAY * hz));
2083 }
2084 }
2085 NET_EPOCH_EXIT(et);
2086
2087 /*
2088 * special cases, like 6to4, are handled in in6_ifattach
2089 */
2090 in6_ifattach(ifp, NULL);
2091 }
2092
2093 static void
in6_ifevent(void * arg __unused,struct ifnet * ifp,int event)2094 in6_ifevent(void *arg __unused, struct ifnet *ifp, int event)
2095 {
2096 if (event == IFNET_EVENT_UP)
2097 in6_if_up(ifp);
2098 }
2099
2100 static void
in6_init(void * arg __unused)2101 in6_init(void *arg __unused)
2102 {
2103 EVENTHANDLER_REGISTER(ifnet_event, in6_ifevent, NULL, EVENTHANDLER_PRI_ANY);
2104 }
2105 SYSINIT(in6_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, in6_init, NULL);
2106
2107 int
in6if_do_dad(struct ifnet * ifp)2108 in6if_do_dad(struct ifnet *ifp)
2109 {
2110
2111 if ((ifp->if_flags & IFF_LOOPBACK) != 0)
2112 return (0);
2113 if ((ifp->if_flags & IFF_MULTICAST) == 0)
2114 return (0);
2115 if ((ND_IFINFO(ifp)->flags &
2116 (ND6_IFF_IFDISABLED | ND6_IFF_NO_DAD)) != 0)
2117 return (0);
2118 return (1);
2119 }
2120
2121 /*
2122 * Provide the length of interface identifiers to be used for the link attached
2123 * to the given interface. The length should be defined in "IPv6 over
2124 * xxx-link" document. Note that address architecture might also define
2125 * the length for a particular set of address prefixes, regardless of the
2126 * link type. As clarified in rfc2462bis, those two definitions should be
2127 * consistent, and those really are as of August 2004.
2128 */
2129 int
in6_if2idlen(struct ifnet * ifp)2130 in6_if2idlen(struct ifnet *ifp)
2131 {
2132 switch (ifp->if_type) {
2133 case IFT_ETHER: /* RFC2464 */
2134 case IFT_PROPVIRTUAL: /* XXX: no RFC. treat it as ether */
2135 case IFT_L2VLAN: /* ditto */
2136 case IFT_BRIDGE: /* bridge(4) only does Ethernet-like links */
2137 case IFT_INFINIBAND:
2138 return (64);
2139 case IFT_PPP: /* RFC2472 */
2140 return (64);
2141 case IFT_FRELAY: /* RFC2590 */
2142 return (64);
2143 case IFT_IEEE1394: /* RFC3146 */
2144 return (64);
2145 case IFT_GIF:
2146 return (64); /* draft-ietf-v6ops-mech-v2-07 */
2147 case IFT_LOOP:
2148 return (64); /* XXX: is this really correct? */
2149 default:
2150 /*
2151 * Unknown link type:
2152 * It might be controversial to use the today's common constant
2153 * of 64 for these cases unconditionally. For full compliance,
2154 * we should return an error in this case. On the other hand,
2155 * if we simply miss the standard for the link type or a new
2156 * standard is defined for a new link type, the IFID length
2157 * is very likely to be the common constant. As a compromise,
2158 * we always use the constant, but make an explicit notice
2159 * indicating the "unknown" case.
2160 */
2161 printf("in6_if2idlen: unknown link type (%d)\n", ifp->if_type);
2162 return (64);
2163 }
2164 }
2165
2166 struct in6_llentry {
2167 struct llentry base;
2168 };
2169
2170 #define IN6_LLTBL_DEFAULT_HSIZE 32
2171 #define IN6_LLTBL_HASH(k, h) \
2172 (((((((k >> 8) ^ k) >> 8) ^ k) >> 8) ^ k) & ((h) - 1))
2173
2174 /*
2175 * Do actual deallocation of @lle.
2176 */
2177 static void
in6_lltable_destroy_lle_unlocked(epoch_context_t ctx)2178 in6_lltable_destroy_lle_unlocked(epoch_context_t ctx)
2179 {
2180 struct llentry *lle;
2181
2182 lle = __containerof(ctx, struct llentry, lle_epoch_ctx);
2183 LLE_LOCK_DESTROY(lle);
2184 LLE_REQ_DESTROY(lle);
2185 free(lle, M_LLTABLE);
2186 }
2187
2188 /*
2189 * Called by LLE_FREE_LOCKED when number of references
2190 * drops to zero.
2191 */
2192 static void
in6_lltable_destroy_lle(struct llentry * lle)2193 in6_lltable_destroy_lle(struct llentry *lle)
2194 {
2195
2196 LLE_WUNLOCK(lle);
2197 NET_EPOCH_CALL(in6_lltable_destroy_lle_unlocked, &lle->lle_epoch_ctx);
2198 }
2199
2200 static struct llentry *
in6_lltable_new(const struct in6_addr * addr6,u_int flags)2201 in6_lltable_new(const struct in6_addr *addr6, u_int flags)
2202 {
2203 struct in6_llentry *lle;
2204
2205 lle = malloc(sizeof(struct in6_llentry), M_LLTABLE, M_NOWAIT | M_ZERO);
2206 if (lle == NULL) /* NB: caller generates msg */
2207 return NULL;
2208
2209 lle->base.r_l3addr.addr6 = *addr6;
2210 lle->base.lle_refcnt = 1;
2211 lle->base.lle_free = in6_lltable_destroy_lle;
2212 LLE_LOCK_INIT(&lle->base);
2213 LLE_REQ_INIT(&lle->base);
2214 callout_init(&lle->base.lle_timer, 1);
2215
2216 return (&lle->base);
2217 }
2218
2219 static int
in6_lltable_match_prefix(const struct sockaddr * saddr,const struct sockaddr * smask,u_int flags,struct llentry * lle)2220 in6_lltable_match_prefix(const struct sockaddr *saddr,
2221 const struct sockaddr *smask, u_int flags, struct llentry *lle)
2222 {
2223 const struct in6_addr *addr, *mask, *lle_addr;
2224
2225 addr = &((const struct sockaddr_in6 *)saddr)->sin6_addr;
2226 mask = &((const struct sockaddr_in6 *)smask)->sin6_addr;
2227 lle_addr = &lle->r_l3addr.addr6;
2228
2229 if (IN6_ARE_MASKED_ADDR_EQUAL(lle_addr, addr, mask) == 0)
2230 return (0);
2231
2232 if (lle->la_flags & LLE_IFADDR) {
2233 /*
2234 * Delete LLE_IFADDR records IFF address & flag matches.
2235 * Note that addr is the interface address within prefix
2236 * being matched.
2237 */
2238 if (IN6_ARE_ADDR_EQUAL(addr, lle_addr) &&
2239 (flags & LLE_STATIC) != 0)
2240 return (1);
2241 return (0);
2242 }
2243
2244 /* flags & LLE_STATIC means deleting both dynamic and static entries */
2245 if ((flags & LLE_STATIC) || !(lle->la_flags & LLE_STATIC))
2246 return (1);
2247
2248 return (0);
2249 }
2250
2251 static void
in6_lltable_free_entry(struct lltable * llt,struct llentry * lle)2252 in6_lltable_free_entry(struct lltable *llt, struct llentry *lle)
2253 {
2254
2255 LLE_WLOCK_ASSERT(lle);
2256 KASSERT(llt != NULL, ("lltable is NULL"));
2257
2258 /* Unlink entry from table */
2259 if ((lle->la_flags & LLE_LINKED) != 0) {
2260 LLTABLE_LOCK_ASSERT(llt);
2261 lltable_unlink_entry(llt, lle);
2262 }
2263
2264 llentry_free(lle);
2265 }
2266
2267 static int
in6_lltable_rtcheck(struct ifnet * ifp,u_int flags,const struct sockaddr * l3addr)2268 in6_lltable_rtcheck(struct ifnet *ifp,
2269 u_int flags,
2270 const struct sockaddr *l3addr)
2271 {
2272 const struct sockaddr_in6 *sin6;
2273 struct nhop_object *nh;
2274 struct in6_addr dst;
2275 uint32_t scopeid;
2276 char ip6buf[INET6_ADDRSTRLEN];
2277 int fibnum;
2278
2279 NET_EPOCH_ASSERT();
2280 KASSERT(l3addr->sa_family == AF_INET6,
2281 ("sin_family %d", l3addr->sa_family));
2282
2283 sin6 = (const struct sockaddr_in6 *)l3addr;
2284 in6_splitscope(&sin6->sin6_addr, &dst, &scopeid);
2285 fibnum = V_rt_add_addr_allfibs ? RT_DEFAULT_FIB : ifp->if_fib;
2286 nh = fib6_lookup(fibnum, &dst, scopeid, NHR_NONE, 0);
2287 if (nh && ((nh->nh_flags & NHF_GATEWAY) || nh->nh_ifp != ifp)) {
2288 struct ifaddr *ifa;
2289 /*
2290 * Create an ND6 cache for an IPv6 neighbor
2291 * that is not covered by our own prefix.
2292 */
2293 ifa = ifaof_ifpforaddr(l3addr, ifp);
2294 if (ifa != NULL) {
2295 return 0;
2296 }
2297 log(LOG_INFO, "IPv6 address: \"%s\" is not on the network\n",
2298 ip6_sprintf(ip6buf, &sin6->sin6_addr));
2299 return EINVAL;
2300 }
2301 return 0;
2302 }
2303
2304 static inline uint32_t
in6_lltable_hash_dst(const struct in6_addr * dst,uint32_t hsize)2305 in6_lltable_hash_dst(const struct in6_addr *dst, uint32_t hsize)
2306 {
2307
2308 return (IN6_LLTBL_HASH(dst->s6_addr32[3], hsize));
2309 }
2310
2311 static uint32_t
in6_lltable_hash(const struct llentry * lle,uint32_t hsize)2312 in6_lltable_hash(const struct llentry *lle, uint32_t hsize)
2313 {
2314
2315 return (in6_lltable_hash_dst(&lle->r_l3addr.addr6, hsize));
2316 }
2317
2318 static void
in6_lltable_fill_sa_entry(const struct llentry * lle,struct sockaddr * sa)2319 in6_lltable_fill_sa_entry(const struct llentry *lle, struct sockaddr *sa)
2320 {
2321 struct sockaddr_in6 *sin6;
2322
2323 sin6 = (struct sockaddr_in6 *)sa;
2324 bzero(sin6, sizeof(*sin6));
2325 sin6->sin6_family = AF_INET6;
2326 sin6->sin6_len = sizeof(*sin6);
2327 sin6->sin6_addr = lle->r_l3addr.addr6;
2328 }
2329
2330 static inline struct llentry *
in6_lltable_find_dst(struct lltable * llt,const struct in6_addr * dst)2331 in6_lltable_find_dst(struct lltable *llt, const struct in6_addr *dst)
2332 {
2333 struct llentry *lle;
2334 struct llentries *lleh;
2335 u_int hashidx;
2336
2337 hashidx = in6_lltable_hash_dst(dst, llt->llt_hsize);
2338 lleh = &llt->lle_head[hashidx];
2339 CK_LIST_FOREACH(lle, lleh, lle_next) {
2340 if (lle->la_flags & LLE_DELETED)
2341 continue;
2342 if (IN6_ARE_ADDR_EQUAL(&lle->r_l3addr.addr6, dst))
2343 break;
2344 }
2345
2346 return (lle);
2347 }
2348
2349 static void
in6_lltable_delete_entry(struct lltable * llt,struct llentry * lle)2350 in6_lltable_delete_entry(struct lltable *llt, struct llentry *lle)
2351 {
2352
2353 lle->la_flags |= LLE_DELETED;
2354
2355 /* Leave the solicited multicast group. */
2356 if ((lle->la_flags & LLE_PUB) != 0)
2357 in6_leave_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6);
2358 EVENTHANDLER_INVOKE(lle_event, lle, LLENTRY_DELETED);
2359 #ifdef DIAGNOSTIC
2360 log(LOG_INFO, "ifaddr cache = %p is deleted\n", lle);
2361 #endif
2362 llentry_free(lle);
2363 }
2364
2365 static struct llentry *
in6_lltable_alloc(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)2366 in6_lltable_alloc(struct lltable *llt, u_int flags,
2367 const struct sockaddr *l3addr)
2368 {
2369 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2370 struct ifnet *ifp = llt->llt_ifp;
2371 struct llentry *lle;
2372 char linkhdr[LLE_MAX_LINKHDR];
2373 size_t linkhdrsize;
2374 int lladdr_off;
2375
2376 KASSERT(l3addr->sa_family == AF_INET6,
2377 ("sin_family %d", l3addr->sa_family));
2378
2379 /*
2380 * A route that covers the given address must have
2381 * been installed 1st because we are doing a resolution,
2382 * verify this.
2383 */
2384 if (!(flags & LLE_IFADDR) &&
2385 in6_lltable_rtcheck(ifp, flags, l3addr) != 0)
2386 return (NULL);
2387
2388 lle = in6_lltable_new(&sin6->sin6_addr, flags);
2389 if (lle == NULL) {
2390 log(LOG_INFO, "lla_lookup: new lle malloc failed\n");
2391 return (NULL);
2392 }
2393 lle->la_flags = flags;
2394 if ((flags & LLE_IFADDR) == LLE_IFADDR) {
2395 linkhdrsize = LLE_MAX_LINKHDR;
2396 if (lltable_calc_llheader(ifp, AF_INET6, IF_LLADDR(ifp),
2397 linkhdr, &linkhdrsize, &lladdr_off) != 0) {
2398 in6_lltable_free_entry(llt, lle);
2399 return (NULL);
2400 }
2401 lltable_set_entry_addr(ifp, lle, linkhdr, linkhdrsize,
2402 lladdr_off);
2403 lle->la_flags |= LLE_STATIC;
2404 }
2405
2406 if ((lle->la_flags & LLE_STATIC) != 0)
2407 lle->ln_state = ND6_LLINFO_REACHABLE;
2408
2409 return (lle);
2410 }
2411
2412 static struct llentry *
in6_lltable_lookup(struct lltable * llt,u_int flags,const struct sockaddr * l3addr)2413 in6_lltable_lookup(struct lltable *llt, u_int flags,
2414 const struct sockaddr *l3addr)
2415 {
2416 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)l3addr;
2417 int family = flags >> 16;
2418 struct llentry *lle;
2419
2420 LLTABLE_RLOCK_ASSERT(llt);
2421 KASSERT(l3addr->sa_family == AF_INET6,
2422 ("sin_family %d", l3addr->sa_family));
2423 KASSERT((flags & (LLE_UNLOCKED | LLE_EXCLUSIVE)) !=
2424 (LLE_UNLOCKED | LLE_EXCLUSIVE),
2425 ("wrong lle request flags: %#x", flags));
2426
2427 lle = in6_lltable_find_dst(llt, &sin6->sin6_addr);
2428
2429 if (__predict_false(family != AF_INET6))
2430 lle = llentry_lookup_family(lle, family);
2431
2432 if (lle == NULL)
2433 return (NULL);
2434
2435 if (flags & LLE_UNLOCKED)
2436 return (lle);
2437
2438 if (flags & LLE_EXCLUSIVE)
2439 LLE_WLOCK(lle);
2440 else
2441 LLE_RLOCK(lle);
2442
2443 /*
2444 * If the lltable lock is not held, the LLE may have been unlinked while
2445 * we were blocked on the LLE lock. Check for this case.
2446 */
2447 if (__predict_false((lle->la_flags & LLE_LINKED) == 0)) {
2448 if (flags & LLE_EXCLUSIVE)
2449 LLE_WUNLOCK(lle);
2450 else
2451 LLE_RUNLOCK(lle);
2452 return (NULL);
2453 }
2454 return (lle);
2455 }
2456
2457 static int
in6_lltable_dump_entry(struct lltable * llt,struct llentry * lle,struct sysctl_req * wr)2458 in6_lltable_dump_entry(struct lltable *llt, struct llentry *lle,
2459 struct sysctl_req *wr)
2460 {
2461 struct ifnet *ifp = llt->llt_ifp;
2462 /* XXX stack use */
2463 struct {
2464 struct rt_msghdr rtm;
2465 struct sockaddr_in6 sin6;
2466 /*
2467 * ndp.c assumes that sdl is word aligned
2468 */
2469 #ifdef __LP64__
2470 uint32_t pad;
2471 #endif
2472 struct sockaddr_dl sdl;
2473 } ndpc;
2474 struct sockaddr_dl *sdl;
2475 int error;
2476
2477 bzero(&ndpc, sizeof(ndpc));
2478 /* skip deleted entries */
2479 if ((lle->la_flags & LLE_DELETED) == LLE_DELETED)
2480 return (0);
2481 /* Skip if jailed and not a valid IP of the prison. */
2482 lltable_fill_sa_entry(lle, (struct sockaddr *)&ndpc.sin6);
2483 if (prison_if(wr->td->td_ucred, (struct sockaddr *)&ndpc.sin6) != 0)
2484 return (0);
2485 /*
2486 * produce a msg made of:
2487 * struct rt_msghdr;
2488 * struct sockaddr_in6 (IPv6)
2489 * struct sockaddr_dl;
2490 */
2491 ndpc.rtm.rtm_msglen = sizeof(ndpc);
2492 ndpc.rtm.rtm_version = RTM_VERSION;
2493 ndpc.rtm.rtm_type = RTM_GET;
2494 ndpc.rtm.rtm_flags = RTF_UP;
2495 ndpc.rtm.rtm_addrs = RTA_DST | RTA_GATEWAY;
2496 sa6_recoverscope(&ndpc.sin6);
2497
2498 /* publish */
2499 if (lle->la_flags & LLE_PUB)
2500 ndpc.rtm.rtm_flags |= RTF_ANNOUNCE;
2501
2502 sdl = &ndpc.sdl;
2503 sdl->sdl_family = AF_LINK;
2504 sdl->sdl_len = sizeof(*sdl);
2505 sdl->sdl_index = ifp->if_index;
2506 sdl->sdl_type = ifp->if_type;
2507 if ((lle->la_flags & LLE_VALID) == LLE_VALID) {
2508 sdl->sdl_alen = ifp->if_addrlen;
2509 bcopy(lle->ll_addr, LLADDR(sdl), ifp->if_addrlen);
2510 } else {
2511 sdl->sdl_alen = 0;
2512 bzero(LLADDR(sdl), ifp->if_addrlen);
2513 }
2514 if (lle->la_expire != 0)
2515 ndpc.rtm.rtm_rmx.rmx_expire = lle->la_expire +
2516 lle->lle_remtime / hz + time_second - time_uptime;
2517 ndpc.rtm.rtm_flags |= (RTF_HOST | RTF_LLDATA);
2518 if (lle->la_flags & LLE_STATIC)
2519 ndpc.rtm.rtm_flags |= RTF_STATIC;
2520 if (lle->la_flags & LLE_IFADDR)
2521 ndpc.rtm.rtm_flags |= RTF_PINNED;
2522 if (lle->ln_router != 0)
2523 ndpc.rtm.rtm_flags |= RTF_GATEWAY;
2524 ndpc.rtm.rtm_rmx.rmx_pksent = lle->la_asked;
2525 /* Store state in rmx_weight value */
2526 ndpc.rtm.rtm_rmx.rmx_state = lle->ln_state;
2527 ndpc.rtm.rtm_index = ifp->if_index;
2528 error = SYSCTL_OUT(wr, &ndpc, sizeof(ndpc));
2529
2530 return (error);
2531 }
2532
2533 static void
in6_lltable_post_resolved(struct lltable * llt,struct llentry * lle)2534 in6_lltable_post_resolved(struct lltable *llt, struct llentry *lle)
2535 {
2536 /* Join the solicited multicast group for dst. */
2537 if ((lle->la_flags & LLE_PUB) == LLE_PUB)
2538 in6_join_proxy_ndp_mc(llt->llt_ifp, &lle->r_l3addr.addr6);
2539 }
2540
2541 static struct lltable *
in6_lltattach(struct ifnet * ifp)2542 in6_lltattach(struct ifnet *ifp)
2543 {
2544 struct lltable *llt;
2545
2546 llt = lltable_allocate_htbl(IN6_LLTBL_DEFAULT_HSIZE);
2547 llt->llt_af = AF_INET6;
2548 llt->llt_ifp = ifp;
2549
2550 llt->llt_lookup = in6_lltable_lookup;
2551 llt->llt_alloc_entry = in6_lltable_alloc;
2552 llt->llt_delete_entry = in6_lltable_delete_entry;
2553 llt->llt_dump_entry = in6_lltable_dump_entry;
2554 llt->llt_hash = in6_lltable_hash;
2555 llt->llt_fill_sa_entry = in6_lltable_fill_sa_entry;
2556 llt->llt_free_entry = in6_lltable_free_entry;
2557 llt->llt_match_prefix = in6_lltable_match_prefix;
2558 llt->llt_mark_used = llentry_mark_used;
2559 llt->llt_post_resolved = in6_lltable_post_resolved;
2560 lltable_link(llt);
2561
2562 return (llt);
2563 }
2564
2565 struct lltable *
in6_lltable_get(struct ifnet * ifp)2566 in6_lltable_get(struct ifnet *ifp)
2567 {
2568 if (ifp->if_inet6 == NULL)
2569 return (NULL);
2570
2571 return (ifp->if_inet6->lltable);
2572 }
2573
2574 void
in6_ifarrival(void * arg __unused,struct ifnet * ifp)2575 in6_ifarrival(void *arg __unused, struct ifnet *ifp)
2576 {
2577 struct in6_ifextra *ext;
2578
2579 /* There are not IPv6-capable interfaces. */
2580 switch (ifp->if_type) {
2581 case IFT_PFLOG:
2582 case IFT_PFSYNC:
2583 ifp->if_inet6 = NULL;
2584 return;
2585 }
2586 ext = (struct in6_ifextra *)malloc(sizeof(*ext), M_IFADDR, M_WAITOK);
2587 bzero(ext, sizeof(*ext));
2588
2589 ext->in6_ifstat = malloc(sizeof(counter_u64_t) *
2590 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_IFADDR, M_WAITOK);
2591 COUNTER_ARRAY_ALLOC(ext->in6_ifstat,
2592 sizeof(struct in6_ifstat) / sizeof(uint64_t), M_WAITOK);
2593
2594 ext->icmp6_ifstat = malloc(sizeof(counter_u64_t) *
2595 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_IFADDR,
2596 M_WAITOK);
2597 COUNTER_ARRAY_ALLOC(ext->icmp6_ifstat,
2598 sizeof(struct icmp6_ifstat) / sizeof(uint64_t), M_WAITOK);
2599
2600 ext->nd_ifinfo = nd6_ifattach(ifp);
2601 ext->scope6_id = scope6_ifattach(ifp);
2602 ext->lltable = in6_lltattach(ifp);
2603
2604 ext->mld_ifinfo = mld_domifattach(ifp);
2605
2606 ifp->if_inet6 = ext;
2607 }
2608 EVENTHANDLER_DEFINE(ifnet_arrival_event, in6_ifarrival, NULL,
2609 EVENTHANDLER_PRI_ANY);
2610
2611 uint32_t
in6_ifmtu(struct ifnet * ifp)2612 in6_ifmtu(struct ifnet *ifp)
2613 {
2614 return (IN6_LINKMTU(ifp));
2615 }
2616
2617 /*
2618 * Convert sockaddr_in6 to sockaddr_in. Original sockaddr_in6 must be
2619 * v4 mapped addr or v4 compat addr
2620 */
2621 void
in6_sin6_2_sin(struct sockaddr_in * sin,const struct sockaddr_in6 * sin6)2622 in6_sin6_2_sin(struct sockaddr_in *sin, const struct sockaddr_in6 *sin6)
2623 {
2624
2625 bzero(sin, sizeof(*sin));
2626 sin->sin_len = sizeof(struct sockaddr_in);
2627 sin->sin_family = AF_INET;
2628 sin->sin_port = sin6->sin6_port;
2629 sin->sin_addr.s_addr = sin6->sin6_addr.s6_addr32[3];
2630 }
2631
2632 /* Convert sockaddr_in to sockaddr_in6 in v4 mapped addr format. */
2633 void
in6_sin_2_v4mapsin6(const struct sockaddr_in * sin,struct sockaddr_in6 * sin6)2634 in6_sin_2_v4mapsin6(const struct sockaddr_in *sin, struct sockaddr_in6 *sin6)
2635 {
2636 bzero(sin6, sizeof(*sin6));
2637 sin6->sin6_len = sizeof(struct sockaddr_in6);
2638 sin6->sin6_family = AF_INET6;
2639 sin6->sin6_port = sin->sin_port;
2640 sin6->sin6_addr.s6_addr32[0] = 0;
2641 sin6->sin6_addr.s6_addr32[1] = 0;
2642 sin6->sin6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP;
2643 sin6->sin6_addr.s6_addr32[3] = sin->sin_addr.s_addr;
2644 }
2645
2646 /* Convert sockaddr_in6 into sockaddr_in. */
2647 void
in6_sin6_2_sin_in_sock(struct sockaddr * nam)2648 in6_sin6_2_sin_in_sock(struct sockaddr *nam)
2649 {
2650 struct sockaddr_in *sin_p;
2651 struct sockaddr_in6 sin6;
2652
2653 /*
2654 * Save original sockaddr_in6 addr and convert it
2655 * to sockaddr_in.
2656 */
2657 sin6 = *(struct sockaddr_in6 *)nam;
2658 sin_p = (struct sockaddr_in *)nam;
2659 in6_sin6_2_sin(sin_p, &sin6);
2660 }
2661
2662 /*
2663 * Join/leave the solicited multicast groups for proxy NDP entries.
2664 */
2665 static void
in6_join_proxy_ndp_mc(struct ifnet * ifp,const struct in6_addr * dst)2666 in6_join_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst)
2667 {
2668 struct in6_multi *inm;
2669 struct in6_addr mltaddr;
2670 char ip6buf[INET6_ADDRSTRLEN];
2671 int error;
2672
2673 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0)
2674 return; /* error logged in in6_solicited_node_maddr. */
2675
2676 error = in6_joingroup(ifp, &mltaddr, NULL, &inm, 0);
2677 if (error != 0) {
2678 nd6log((LOG_WARNING,
2679 "%s: in6_joingroup failed for %s on %s (errno=%d)\n",
2680 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp),
2681 error));
2682 }
2683 }
2684
2685 static void
in6_leave_proxy_ndp_mc(struct ifnet * ifp,const struct in6_addr * dst)2686 in6_leave_proxy_ndp_mc(struct ifnet *ifp, const struct in6_addr *dst)
2687 {
2688 struct epoch_tracker et;
2689 struct in6_multi *inm;
2690 struct in6_addr mltaddr;
2691 char ip6buf[INET6_ADDRSTRLEN];
2692
2693 if (in6_solicited_node_maddr(&mltaddr, ifp, dst) != 0)
2694 return; /* error logged in in6_solicited_node_maddr. */
2695
2696 NET_EPOCH_ENTER(et);
2697 inm = in6m_lookup(ifp, &mltaddr);
2698 NET_EPOCH_EXIT(et);
2699 if (inm != NULL)
2700 in6_leavegroup(inm, NULL);
2701 else
2702 nd6log((LOG_WARNING, "%s: in6m_lookup failed for %s on %s\n",
2703 __func__, ip6_sprintf(ip6buf, &mltaddr), if_name(ifp)));
2704 }
2705
2706 static bool
in6_lle_match_pub(struct lltable * llt,struct llentry * lle,void * farg)2707 in6_lle_match_pub(struct lltable *llt, struct llentry *lle, void *farg)
2708 {
2709 return ((lle->la_flags & LLE_PUB) != 0);
2710 }
2711
2712 void
in6_purge_proxy_ndp(struct ifnet * ifp)2713 in6_purge_proxy_ndp(struct ifnet *ifp)
2714 {
2715 struct lltable *llt;
2716 bool need_purge;
2717
2718 if (ifp->if_inet6 == NULL)
2719 return;
2720
2721 llt = LLTABLE6(ifp);
2722 LLTABLE_LOCK(llt);
2723 need_purge = ((llt->llt_flags & LLT_ADDEDPROXY) != 0);
2724 LLTABLE_UNLOCK(llt);
2725
2726 /*
2727 * Ever added proxy ndp entries, leave solicited node multicast
2728 * before deleting the llentry.
2729 */
2730 if (need_purge)
2731 lltable_delete_conditional(llt, in6_lle_match_pub, NULL);
2732 }
2733