2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. Neither the name of the project nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $KAME: in6_src.c,v 1.132 2003/08/26 04:42:27 keiichi Exp $
33 * Copyright (c) 1982, 1986, 1991, 1993
34 * The Regents of the University of California. All rights reserved.
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 4. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
63 #include <sys/cdefs.h>
64 __FBSDID("$FreeBSD$");
67 #include "opt_inet6.h"
68 #include "opt_mpath.h"
70 #include <sys/param.h>
71 #include <sys/systm.h>
73 #include <sys/malloc.h>
76 #include <sys/protosw.h>
77 #include <sys/socket.h>
78 #include <sys/socketvar.h>
79 #include <sys/sockio.h>
80 #include <sys/sysctl.h>
81 #include <sys/errno.h>
84 #include <sys/kernel.h>
85 #include <sys/rmlock.h>
89 #include <net/if_var.h>
90 #include <net/if_dl.h>
91 #include <net/route.h>
92 #include <net/if_llatbl.h>
94 #include <net/radix_mpath.h>
97 #include <netinet/in.h>
98 #include <netinet/in_var.h>
99 #include <netinet/in_systm.h>
100 #include <netinet/ip.h>
101 #include <netinet/in_pcb.h>
102 #include <netinet/ip_var.h>
103 #include <netinet/udp.h>
104 #include <netinet/udp_var.h>
106 #include <netinet6/in6_var.h>
107 #include <netinet/ip6.h>
108 #include <netinet6/in6_fib.h>
109 #include <netinet6/in6_pcb.h>
110 #include <netinet6/ip6_var.h>
111 #include <netinet6/scope6_var.h>
112 #include <netinet6/nd6.h>
114 static struct mtx addrsel_lock;
115 #define ADDRSEL_LOCK_INIT() mtx_init(&addrsel_lock, "addrsel_lock", NULL, MTX_DEF)
116 #define ADDRSEL_LOCK() mtx_lock(&addrsel_lock)
117 #define ADDRSEL_UNLOCK() mtx_unlock(&addrsel_lock)
118 #define ADDRSEL_LOCK_ASSERT() mtx_assert(&addrsel_lock, MA_OWNED)
120 static struct sx addrsel_sxlock;
121 #define ADDRSEL_SXLOCK_INIT() sx_init(&addrsel_sxlock, "addrsel_sxlock")
122 #define ADDRSEL_SLOCK() sx_slock(&addrsel_sxlock)
123 #define ADDRSEL_SUNLOCK() sx_sunlock(&addrsel_sxlock)
124 #define ADDRSEL_XLOCK() sx_xlock(&addrsel_sxlock)
125 #define ADDRSEL_XUNLOCK() sx_xunlock(&addrsel_sxlock)
127 #define ADDR_LABEL_NOTAPP (-1)
128 static VNET_DEFINE(struct in6_addrpolicy, defaultaddrpolicy);
129 #define V_defaultaddrpolicy VNET(defaultaddrpolicy)
131 VNET_DEFINE(int, ip6_prefer_tempaddr) = 0;
133 static int selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
134 struct ip6_moptions *, struct route_in6 *, struct ifnet **,
135 struct rtentry **, int, u_int);
136 static int in6_selectif(struct sockaddr_in6 *, struct ip6_pktopts *,
137 struct ip6_moptions *, struct ifnet **,
138 struct ifnet *, u_int);
140 static struct in6_addrpolicy *lookup_addrsel_policy(struct sockaddr_in6 *);
142 static void init_policy_queue(void);
143 static int add_addrsel_policyent(struct in6_addrpolicy *);
144 static int delete_addrsel_policyent(struct in6_addrpolicy *);
145 static int walk_addrsel_policy(int (*)(struct in6_addrpolicy *, void *),
147 static int dump_addrsel_policyent(struct in6_addrpolicy *, void *);
148 static struct in6_addrpolicy *match_addrsel_policy(struct sockaddr_in6 *);
151 * Return an IPv6 address, which is the most appropriate for a given
152 * destination and user specified options.
153 * If necessary, this function lookups the routing table and returns
154 * an entry to the caller for later use.
156 #define REPLACE(r) do {\
157 IP6STAT_INC(ip6s_sources_rule[(r)]); \
160 char ip6buf[INET6_ADDRSTRLEN], ip6b[INET6_ADDRSTRLEN]; \
161 printf("in6_selectsrc: replace %s with %s by %d\n", ia_best ? ip6_sprintf(ip6buf, &ia_best->ia_addr.sin6_addr) : "none", ip6_sprintf(ip6b, &ia->ia_addr.sin6_addr), (r)); \
165 #define NEXT(r) do {\
167 char ip6buf[INET6_ADDRSTRLEN], ip6b[INET6_ADDRSTRLEN]; \
168 printf("in6_selectsrc: keep %s against %s by %d\n", ia_best ? ip6_sprintf(ip6buf, &ia_best->ia_addr.sin6_addr) : "none", ip6_sprintf(ip6b, &ia->ia_addr.sin6_addr), (r)); \
170 goto next; /* XXX: we can't use 'continue' here */ \
172 #define BREAK(r) do { \
173 IP6STAT_INC(ip6s_sources_rule[(r)]); \
175 goto out; /* XXX: we can't use 'break' here */ \
179 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
180 struct inpcb *inp, struct ucred *cred,
181 struct ifnet **ifpp, struct in6_addr *srcp)
183 struct rm_priotracker in6_ifa_tracker;
184 struct in6_addr dst, tmp;
185 struct ifnet *ifp = NULL, *oifp = NULL;
186 struct in6_ifaddr *ia = NULL, *ia_best = NULL;
187 struct in6_pktinfo *pi = NULL;
188 int dst_scope = -1, best_scope = -1, best_matchlen = -1;
189 struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
193 struct ip6_moptions *mopts;
195 KASSERT(srcp != NULL, ("%s: srcp is NULL", __func__));
197 dst = dstsock->sin6_addr; /* make a copy for local operation */
200 * Save a possibly passed in ifp for in6_selectsrc. Only
201 * neighbor discovery code should use this feature, where
202 * we may know the interface but not the FIB number holding
203 * the connected subnet in case someone deleted it from the
204 * default FIB and we need to check the interface.
212 INP_LOCK_ASSERT(inp);
213 mopts = inp->in6p_moptions;
219 * If the source address is explicitly specified by the caller,
220 * check if the requested source address is indeed a unicast address
221 * assigned to the node, and can be used as the packet's source
222 * address. If everything is okay, use the address as source.
224 if (opts && (pi = opts->ip6po_pktinfo) &&
225 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
226 struct sockaddr_in6 srcsock;
227 struct in6_ifaddr *ia6;
229 /* get the outgoing interface */
230 if ((error = in6_selectif(dstsock, opts, mopts, &ifp, oifp,
231 (inp != NULL) ? inp->inp_inc.inc_fibnum : RT_DEFAULT_FIB))
236 * determine the appropriate zone id of the source based on
237 * the zone of the destination and the outgoing interface.
238 * If the specified address is ambiguous wrt the scope zone,
239 * the interface must be specified; otherwise, ifa_ifwithaddr()
240 * will fail matching the address.
242 bzero(&srcsock, sizeof(srcsock));
243 srcsock.sin6_family = AF_INET6;
244 srcsock.sin6_len = sizeof(srcsock);
245 srcsock.sin6_addr = pi->ipi6_addr;
247 error = in6_setscope(&srcsock.sin6_addr, ifp, NULL);
251 if (cred != NULL && (error = prison_local_ip6(cred,
252 &srcsock.sin6_addr, (inp != NULL &&
253 (inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
256 ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(
257 (struct sockaddr *)&srcsock);
259 (ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) {
261 ifa_free(&ia6->ia_ifa);
262 return (EADDRNOTAVAIL);
264 pi->ipi6_addr = srcsock.sin6_addr; /* XXX: this overrides pi */
267 bcopy(&ia6->ia_addr.sin6_addr, srcp, sizeof(*srcp));
268 ifa_free(&ia6->ia_ifa);
273 * Otherwise, if the socket has already bound the source, just use it.
275 if (inp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
277 (error = prison_local_ip6(cred, &inp->in6p_laddr,
278 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
280 bcopy(&inp->in6p_laddr, srcp, sizeof(*srcp));
285 * Bypass source address selection and use the primary jail IP
288 if (cred != NULL && !prison_saddrsel_ip6(cred, srcp))
292 * If the address is not specified, choose the best one based on
293 * the outgoing interface and the destination address.
295 /* get the outgoing interface */
296 if ((error = in6_selectif(dstsock, opts, mopts, &ifp, oifp,
297 (inp != NULL) ? inp->inp_inc.inc_fibnum : RT_DEFAULT_FIB)) != 0)
301 if (ifp == NULL) /* this should not happen */
302 panic("in6_selectsrc: NULL ifp");
304 error = in6_setscope(&dst, ifp, &odstzone);
309 IN6_IFADDR_RLOCK(&in6_ifa_tracker);
310 TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
311 int new_scope = -1, new_matchlen = -1;
312 struct in6_addrpolicy *new_policy = NULL;
313 u_int32_t srczone, osrczone, dstzone;
315 struct ifnet *ifp1 = ia->ia_ifp;
318 * We'll never take an address that breaks the scope zone
319 * of the destination. We also skip an address if its zone
320 * does not contain the outgoing interface.
321 * XXX: we should probably use sin6_scope_id here.
323 if (in6_setscope(&dst, ifp1, &dstzone) ||
324 odstzone != dstzone) {
327 src = ia->ia_addr.sin6_addr;
328 if (in6_setscope(&src, ifp, &osrczone) ||
329 in6_setscope(&src, ifp1, &srczone) ||
330 osrczone != srczone) {
334 /* avoid unusable addresses */
336 (IN6_IFF_NOTREADY | IN6_IFF_ANYCAST | IN6_IFF_DETACHED))) {
339 if (!V_ip6_use_deprecated && IFA6_IS_DEPRECATED(ia))
342 /* If jailed only take addresses of the jail into account. */
344 prison_check_ip6(cred, &ia->ia_addr.sin6_addr) != 0)
347 /* Rule 1: Prefer same address */
348 if (IN6_ARE_ADDR_EQUAL(&dst, &ia->ia_addr.sin6_addr)) {
350 BREAK(1); /* there should be no better candidate */
356 /* Rule 2: Prefer appropriate scope */
358 dst_scope = in6_addrscope(&dst);
359 new_scope = in6_addrscope(&ia->ia_addr.sin6_addr);
360 if (IN6_ARE_SCOPE_CMP(best_scope, new_scope) < 0) {
361 if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0)
364 } else if (IN6_ARE_SCOPE_CMP(new_scope, best_scope) < 0) {
365 if (IN6_ARE_SCOPE_CMP(new_scope, dst_scope) < 0)
371 * Rule 3: Avoid deprecated addresses. Note that the case of
372 * !ip6_use_deprecated is already rejected above.
374 if (!IFA6_IS_DEPRECATED(ia_best) && IFA6_IS_DEPRECATED(ia))
376 if (IFA6_IS_DEPRECATED(ia_best) && !IFA6_IS_DEPRECATED(ia))
379 /* Rule 4: Prefer home addresses */
381 * XXX: This is a TODO. We should probably merge the MIP6
385 /* Rule 5: Prefer outgoing interface */
386 if (!(ND_IFINFO(ifp)->flags & ND6_IFF_NO_PREFER_IFACE)) {
387 if (ia_best->ia_ifp == ifp && ia->ia_ifp != ifp)
389 if (ia_best->ia_ifp != ifp && ia->ia_ifp == ifp)
394 * Rule 6: Prefer matching label
395 * Note that best_policy should be non-NULL here.
397 if (dst_policy == NULL)
398 dst_policy = lookup_addrsel_policy(dstsock);
399 if (dst_policy->label != ADDR_LABEL_NOTAPP) {
400 new_policy = lookup_addrsel_policy(&ia->ia_addr);
401 if (dst_policy->label == best_policy->label &&
402 dst_policy->label != new_policy->label)
404 if (dst_policy->label != best_policy->label &&
405 dst_policy->label == new_policy->label)
410 * Rule 7: Prefer public addresses.
411 * We allow users to reverse the logic by configuring
412 * a sysctl variable, so that privacy conscious users can
413 * always prefer temporary addresses.
416 opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_SYSTEM) {
417 prefer_tempaddr = V_ip6_prefer_tempaddr;
418 } else if (opts->ip6po_prefer_tempaddr ==
419 IP6PO_TEMPADDR_NOTPREFER) {
423 if (!(ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
424 (ia->ia6_flags & IN6_IFF_TEMPORARY)) {
430 if ((ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
431 !(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
439 * Rule 8: prefer addresses on alive interfaces.
440 * This is a KAME specific rule.
442 if ((ia_best->ia_ifp->if_flags & IFF_UP) &&
443 !(ia->ia_ifp->if_flags & IFF_UP))
445 if (!(ia_best->ia_ifp->if_flags & IFF_UP) &&
446 (ia->ia_ifp->if_flags & IFF_UP))
450 * Rule 9: prefer address with better virtual status.
452 if (ifa_preferred(&ia_best->ia_ifa, &ia->ia_ifa))
454 if (ifa_preferred(&ia->ia_ifa, &ia_best->ia_ifa))
458 * Rule 10: prefer address with `prefer_source' flag.
460 if ((ia_best->ia6_flags & IN6_IFF_PREFER_SOURCE) == 0 &&
461 (ia->ia6_flags & IN6_IFF_PREFER_SOURCE) != 0)
463 if ((ia_best->ia6_flags & IN6_IFF_PREFER_SOURCE) != 0 &&
464 (ia->ia6_flags & IN6_IFF_PREFER_SOURCE) == 0)
468 * Rule 14: Use longest matching prefix.
469 * Note: in the address selection draft, this rule is
470 * documented as "Rule 8". However, since it is also
471 * documented that this rule can be overridden, we assign
472 * a large number so that it is easy to assign smaller numbers
473 * to more preferred rules.
475 new_matchlen = in6_matchlen(&ia->ia_addr.sin6_addr, &dst);
476 if (best_matchlen < new_matchlen)
478 if (new_matchlen < best_matchlen)
481 /* Rule 15 is reserved. */
484 * Last resort: just keep the current candidate.
485 * Or, do we need more rules?
491 best_scope = (new_scope >= 0 ? new_scope :
492 in6_addrscope(&ia_best->ia_addr.sin6_addr));
493 best_policy = (new_policy ? new_policy :
494 lookup_addrsel_policy(&ia_best->ia_addr));
495 best_matchlen = (new_matchlen >= 0 ? new_matchlen :
496 in6_matchlen(&ia_best->ia_addr.sin6_addr,
506 if ((ia = ia_best) == NULL) {
507 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
508 IP6STAT_INC(ip6s_sources_none);
509 return (EADDRNOTAVAIL);
513 * At this point at least one of the addresses belonged to the jail
514 * but it could still be, that we want to further restrict it, e.g.
515 * theoratically IN6_IS_ADDR_LOOPBACK.
516 * It must not be IN6_IS_ADDR_UNSPECIFIED anymore.
517 * prison_local_ip6() will fix an IN6_IS_ADDR_LOOPBACK but should
518 * let all others previously selected pass.
519 * Use tmp to not change ::1 on lo0 to the primary jail address.
521 tmp = ia->ia_addr.sin6_addr;
522 if (cred != NULL && prison_local_ip6(cred, &tmp, (inp != NULL &&
523 (inp->inp_flags & IN6P_IPV6_V6ONLY) != 0)) != 0) {
524 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
525 IP6STAT_INC(ip6s_sources_none);
526 return (EADDRNOTAVAIL);
532 bcopy(&tmp, srcp, sizeof(*srcp));
533 if (ia->ia_ifp == ifp)
534 IP6STAT_INC(ip6s_sources_sameif[best_scope]);
536 IP6STAT_INC(ip6s_sources_otherif[best_scope]);
537 if (dst_scope == best_scope)
538 IP6STAT_INC(ip6s_sources_samescope[best_scope]);
540 IP6STAT_INC(ip6s_sources_otherscope[best_scope]);
541 if (IFA6_IS_DEPRECATED(ia))
542 IP6STAT_INC(ip6s_sources_deprecated[best_scope]);
543 IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
548 * clone - meaningful only for bsdi and freebsd
551 selectroute(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
552 struct ip6_moptions *mopts, struct route_in6 *ro,
553 struct ifnet **retifp, struct rtentry **retrt, int norouteok, u_int fibnum)
556 struct ifnet *ifp = NULL;
557 struct rtentry *rt = NULL;
558 struct sockaddr_in6 *sin6_next;
559 struct in6_pktinfo *pi = NULL;
560 struct in6_addr *dst = &dstsock->sin6_addr;
563 char ip6buf[INET6_ADDRSTRLEN];
565 if (dstsock->sin6_addr.s6_addr32[0] == 0 &&
566 dstsock->sin6_addr.s6_addr32[1] == 0 &&
567 !IN6_IS_ADDR_LOOPBACK(&dstsock->sin6_addr)) {
568 printf("in6_selectroute: strange destination %s\n",
569 ip6_sprintf(ip6buf, &dstsock->sin6_addr));
571 printf("in6_selectroute: destination = %s%%%d\n",
572 ip6_sprintf(ip6buf, &dstsock->sin6_addr),
573 dstsock->sin6_scope_id); /* for debug */
577 /* If the caller specify the outgoing interface explicitly, use it. */
578 if (opts && (pi = opts->ip6po_pktinfo) != NULL && pi->ipi6_ifindex) {
579 /* XXX boundary check is assumed to be already done. */
580 ifp = ifnet_byindex(pi->ipi6_ifindex);
582 (norouteok || retrt == NULL ||
583 IN6_IS_ADDR_MULTICAST(dst))) {
585 * we do not have to check or get the route for
593 * If the destination address is a multicast address and the outgoing
594 * interface for the address is specified by the caller, use it.
596 if (IN6_IS_ADDR_MULTICAST(dst) &&
597 mopts != NULL && (ifp = mopts->im6o_multicast_ifp) != NULL) {
598 goto done; /* we do not need a route for multicast. */
601 * If destination address is LLA or link- or node-local multicast,
602 * use it's embedded scope zone id to determine outgoing interface.
604 if (IN6_IS_ADDR_MC_LINKLOCAL(dst) ||
605 IN6_IS_ADDR_MC_NODELOCAL(dst)) {
606 zoneid = ntohs(in6_getscope(dst));
608 ifp = in6_getlinkifnet(zoneid);
615 * If the next hop address for the packet is specified by the caller,
616 * use it as the gateway.
618 if (opts && opts->ip6po_nexthop) {
619 struct route_in6 *ron;
621 sin6_next = satosin6(opts->ip6po_nexthop);
622 if (IN6_IS_ADDR_LINKLOCAL(&sin6_next->sin6_addr)) {
624 * Next hop is LLA, thus it should be neighbor.
625 * Determine outgoing interface by zone index.
627 zoneid = ntohs(in6_getscope(&sin6_next->sin6_addr));
629 ifp = in6_getlinkifnet(zoneid);
633 ron = &opts->ip6po_nextroute;
634 /* Use a cached route if it exists and is valid. */
635 if (ron->ro_rt != NULL && (
636 (ron->ro_rt->rt_flags & RTF_UP) == 0 ||
637 ron->ro_dst.sin6_family != AF_INET6 ||
638 !IN6_ARE_ADDR_EQUAL(&ron->ro_dst.sin6_addr,
639 &sin6_next->sin6_addr)))
641 if (ron->ro_rt == NULL) {
642 ron->ro_dst = *sin6_next;
643 in6_rtalloc(ron, fibnum); /* multi path case? */
646 * The node identified by that address must be a
647 * neighbor of the sending host.
649 if (ron->ro_rt == NULL ||
650 (ron->ro_rt->rt_flags & RTF_GATEWAY) != 0)
651 error = EHOSTUNREACH;
656 * Use a cached route if it exists and is valid, else try to allocate
657 * a new one. Note that we should check the address family of the
658 * cached destination, in case of sharing the cache with IPv4.
662 (!(ro->ro_rt->rt_flags & RTF_UP) ||
663 ((struct sockaddr *)(&ro->ro_dst))->sa_family != AF_INET6 ||
664 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr,
667 ro->ro_rt = (struct rtentry *)NULL;
669 if (ro->ro_rt == (struct rtentry *)NULL) {
670 struct sockaddr_in6 *sa6;
672 /* No route yet, so try to acquire one */
673 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
674 sa6 = (struct sockaddr_in6 *)&ro->ro_dst;
676 sa6->sin6_scope_id = 0;
679 rtalloc_mpath_fib((struct route *)ro,
680 ntohl(sa6->sin6_addr.s6_addr32[3]), fibnum);
682 ro->ro_rt = in6_rtalloc1((struct sockaddr *)
683 &ro->ro_dst, 0, 0UL, fibnum);
685 RT_UNLOCK(ro->ro_rt);
690 * do not care about the result if we have the nexthop
691 * explicitly specified.
693 if (opts && opts->ip6po_nexthop)
697 ifp = ro->ro_rt->rt_ifp;
699 if (ifp == NULL) { /* can this really happen? */
704 if (ro->ro_rt == NULL)
705 error = EHOSTUNREACH;
709 * Check if the outgoing interface conflicts with
710 * the interface specified by ipi6_ifindex (if specified).
711 * Note that loopback interface is always okay.
712 * (this may happen when we are sending a packet to one of
713 * our own addresses.)
715 if (ifp && opts && opts->ip6po_pktinfo &&
716 opts->ip6po_pktinfo->ipi6_ifindex) {
717 if (!(ifp->if_flags & IFF_LOOPBACK) &&
719 opts->ip6po_pktinfo->ipi6_ifindex) {
720 error = EHOSTUNREACH;
727 if (ifp == NULL && rt == NULL) {
729 * This can happen if the caller did not pass a cached route
730 * nor any other hints. We treat this case an error.
732 error = EHOSTUNREACH;
734 if (error == EHOSTUNREACH)
735 IP6STAT_INC(ip6s_noroute);
737 if (retifp != NULL) {
741 * Adjust the "outgoing" interface. If we're going to loop
742 * the packet back to ourselves, the ifp would be the loopback
743 * interface. However, we'd rather know the interface associated
744 * to the destination address (which should probably be one of
745 * our own addresses.)
748 if ((rt->rt_ifp->if_flags & IFF_LOOPBACK) &&
749 (rt->rt_gateway->sa_family == AF_LINK))
751 ifnet_byindex(((struct sockaddr_dl *)
752 rt->rt_gateway)->sdl_index);
757 *retrt = rt; /* rt may be NULL */
763 in6_selectif(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
764 struct ip6_moptions *mopts, struct ifnet **retifp,
765 struct ifnet *oifp, u_int fibnum)
768 struct route_in6 sro;
769 struct rtentry *rt = NULL;
772 KASSERT(retifp != NULL, ("%s: retifp is NULL", __func__));
774 bzero(&sro, sizeof(sro));
777 error = selectroute(dstsock, opts, mopts, &sro, retifp, &rt, 1, fibnum);
780 rt_flags = rt->rt_flags;
781 if (rt && rt == sro.ro_rt)
785 /* Help ND. See oifp comment in in6_selectsrc(). */
786 if (oifp != NULL && fibnum == RT_DEFAULT_FIB) {
794 * do not use a rejected or black hole route.
795 * XXX: this check should be done in the L2 output routine.
796 * However, if we skipped this check here, we'd see the following
798 * - install a rejected route for a scoped address prefix
800 * - send a packet to a destination that matches the scoped prefix,
801 * with ambiguity about the scope zone.
802 * - pick the outgoing interface from the route, and disambiguate the
803 * scope zone with the interface.
804 * - ip6_output() would try to get another route with the "new"
805 * destination, which may be valid.
806 * - we'd see no error on output.
807 * Although this may not be very harmful, it should still be confusing.
808 * We thus reject the case here.
811 if (rt_flags & (RTF_REJECT | RTF_BLACKHOLE)) {
812 error = (rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
820 * Public wrapper function to selectroute().
822 * XXX-BZ in6_selectroute() should and will grow the FIB argument. The
823 * in6_selectroute_fib() function is only there for backward compat on stable.
826 in6_selectroute(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
827 struct ip6_moptions *mopts, struct route_in6 *ro,
828 struct ifnet **retifp, struct rtentry **retrt)
831 return (selectroute(dstsock, opts, mopts, ro, retifp,
832 retrt, 0, RT_DEFAULT_FIB));
837 in6_selectroute_fib(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
838 struct ip6_moptions *mopts, struct route_in6 *ro,
839 struct ifnet **retifp, struct rtentry **retrt, u_int fibnum)
842 return (selectroute(dstsock, opts, mopts, ro, retifp,
848 * Default hop limit selection. The precedence is as follows:
849 * 1. Hoplimit value specified via ioctl.
850 * 2. (If the outgoing interface is detected) the current
851 * hop limit of the interface specified by router advertisement.
852 * 3. The system default hoplimit.
855 in6_selecthlim(struct inpcb *in6p, struct ifnet *ifp)
858 if (in6p && in6p->in6p_hops >= 0)
859 return (in6p->in6p_hops);
861 return (ND_IFINFO(ifp)->chlim);
862 else if (in6p && !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
863 struct nhop6_basic nh6;
865 uint32_t fibnum, scopeid;
868 fibnum = in6p->inp_inc.inc_fibnum;
869 in6_splitscope(&in6p->in6p_faddr, &dst, &scopeid);
870 if (fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6)==0){
871 hlim = ND_IFINFO(nh6.nh_ifp)->chlim;
875 return (V_ip6_defhlim);
879 * XXX: this is borrowed from in6_pcbbind(). If possible, we should
880 * share this function by all *bsd*...
883 in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct ucred *cred)
885 struct socket *so = inp->inp_socket;
887 int error, lookupflags = 0;
889 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
892 INP_WLOCK_ASSERT(inp);
893 INP_HASH_WLOCK_ASSERT(pcbinfo);
895 error = prison_local_ip6(cred, laddr,
896 ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0));
900 /* XXX: this is redundant when called from in6_pcbbind */
901 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
902 lookupflags = INPLOOKUP_WILDCARD;
904 inp->inp_flags |= INP_ANONPORT;
906 error = in_pcb_lport(inp, NULL, &lport, cred, lookupflags);
910 inp->inp_lport = lport;
911 if (in_pcbinshash(inp) != 0) {
912 inp->in6p_laddr = in6addr_any;
921 addrsel_policy_init(void)
926 /* initialize the "last resort" policy */
927 bzero(&V_defaultaddrpolicy, sizeof(V_defaultaddrpolicy));
928 V_defaultaddrpolicy.label = ADDR_LABEL_NOTAPP;
930 if (!IS_DEFAULT_VNET(curvnet))
934 ADDRSEL_SXLOCK_INIT();
937 static struct in6_addrpolicy *
938 lookup_addrsel_policy(struct sockaddr_in6 *key)
940 struct in6_addrpolicy *match = NULL;
943 match = match_addrsel_policy(key);
946 match = &V_defaultaddrpolicy;
955 * Subroutines to manage the address selection policy table via sysctl.
958 struct sysctl_req *w_req;
961 static int in6_src_sysctl(SYSCTL_HANDLER_ARGS);
962 SYSCTL_DECL(_net_inet6_ip6);
963 static SYSCTL_NODE(_net_inet6_ip6, IPV6CTL_ADDRCTLPOLICY, addrctlpolicy,
964 CTLFLAG_RD, in6_src_sysctl, "");
967 in6_src_sysctl(SYSCTL_HANDLER_ARGS)
974 bzero(&w, sizeof(w));
977 return (walk_addrsel_policy(dump_addrsel_policyent, &w));
981 in6_src_ioctl(u_long cmd, caddr_t data)
983 struct in6_addrpolicy ent0;
985 if (cmd != SIOCAADDRCTL_POLICY && cmd != SIOCDADDRCTL_POLICY)
986 return (EOPNOTSUPP); /* check for safety */
988 ent0 = *(struct in6_addrpolicy *)data;
990 if (ent0.label == ADDR_LABEL_NOTAPP)
992 /* check if the prefix mask is consecutive. */
993 if (in6_mask2len(&ent0.addrmask.sin6_addr, NULL) < 0)
995 /* clear trailing garbages (if any) of the prefix address. */
996 IN6_MASK_ADDR(&ent0.addr.sin6_addr, &ent0.addrmask.sin6_addr);
1000 case SIOCAADDRCTL_POLICY:
1001 return (add_addrsel_policyent(&ent0));
1002 case SIOCDADDRCTL_POLICY:
1003 return (delete_addrsel_policyent(&ent0));
1006 return (0); /* XXX: compromise compilers */
1010 * The followings are implementation of the policy table using a
1011 * simple tail queue.
1012 * XXX such details should be hidden.
1013 * XXX implementation using binary tree should be more efficient.
1015 struct addrsel_policyent {
1016 TAILQ_ENTRY(addrsel_policyent) ape_entry;
1017 struct in6_addrpolicy ape_policy;
1020 TAILQ_HEAD(addrsel_policyhead, addrsel_policyent);
1022 static VNET_DEFINE(struct addrsel_policyhead, addrsel_policytab);
1023 #define V_addrsel_policytab VNET(addrsel_policytab)
1026 init_policy_queue(void)
1029 TAILQ_INIT(&V_addrsel_policytab);
1033 add_addrsel_policyent(struct in6_addrpolicy *newpolicy)
1035 struct addrsel_policyent *new, *pol;
1037 new = malloc(sizeof(*new), M_IFADDR,
1042 /* duplication check */
1043 TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
1044 if (IN6_ARE_ADDR_EQUAL(&newpolicy->addr.sin6_addr,
1045 &pol->ape_policy.addr.sin6_addr) &&
1046 IN6_ARE_ADDR_EQUAL(&newpolicy->addrmask.sin6_addr,
1047 &pol->ape_policy.addrmask.sin6_addr)) {
1050 free(new, M_IFADDR);
1051 return (EEXIST); /* or override it? */
1055 bzero(new, sizeof(*new));
1057 /* XXX: should validate entry */
1058 new->ape_policy = *newpolicy;
1060 TAILQ_INSERT_TAIL(&V_addrsel_policytab, new, ape_entry);
1068 delete_addrsel_policyent(struct in6_addrpolicy *key)
1070 struct addrsel_policyent *pol;
1075 /* search for the entry in the table */
1076 TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
1077 if (IN6_ARE_ADDR_EQUAL(&key->addr.sin6_addr,
1078 &pol->ape_policy.addr.sin6_addr) &&
1079 IN6_ARE_ADDR_EQUAL(&key->addrmask.sin6_addr,
1080 &pol->ape_policy.addrmask.sin6_addr)) {
1090 TAILQ_REMOVE(&V_addrsel_policytab, pol, ape_entry);
1093 free(pol, M_IFADDR);
1099 walk_addrsel_policy(int (*callback)(struct in6_addrpolicy *, void *), void *w)
1101 struct addrsel_policyent *pol;
1105 TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
1106 if ((error = (*callback)(&pol->ape_policy, w)) != 0) {
1116 dump_addrsel_policyent(struct in6_addrpolicy *pol, void *arg)
1119 struct walkarg *w = arg;
1121 error = SYSCTL_OUT(w->w_req, pol, sizeof(*pol));
1126 static struct in6_addrpolicy *
1127 match_addrsel_policy(struct sockaddr_in6 *key)
1129 struct addrsel_policyent *pent;
1130 struct in6_addrpolicy *bestpol = NULL, *pol;
1131 int matchlen, bestmatchlen = -1;
1132 u_char *mp, *ep, *k, *p, m;
1134 TAILQ_FOREACH(pent, &V_addrsel_policytab, ape_entry) {
1137 pol = &pent->ape_policy;
1138 mp = (u_char *)&pol->addrmask.sin6_addr;
1139 ep = mp + 16; /* XXX: scope field? */
1140 k = (u_char *)&key->sin6_addr;
1141 p = (u_char *)&pol->addr.sin6_addr;
1142 for (; mp < ep && *mp; mp++, k++, p++) {
1145 goto next; /* not match */
1146 if (m == 0xff) /* short cut for a typical case */
1156 /* matched. check if this is better than the current best. */
1157 if (bestpol == NULL ||
1158 matchlen > bestmatchlen) {
1160 bestmatchlen = matchlen;