xref: /freebsd/sys/netinet6/in6_src.c (revision 9977be4a64ac795fda658d9806415f2a02b11cbb)
1caf43b02SWarner Losh /*-
2686cdd19SJun-ichiro itojun Hagino  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3686cdd19SJun-ichiro itojun Hagino  * All rights reserved.
4686cdd19SJun-ichiro itojun Hagino  *
5686cdd19SJun-ichiro itojun Hagino  * Redistribution and use in source and binary forms, with or without
6686cdd19SJun-ichiro itojun Hagino  * modification, are permitted provided that the following conditions
7686cdd19SJun-ichiro itojun Hagino  * are met:
8686cdd19SJun-ichiro itojun Hagino  * 1. Redistributions of source code must retain the above copyright
9686cdd19SJun-ichiro itojun Hagino  *    notice, this list of conditions and the following disclaimer.
10686cdd19SJun-ichiro itojun Hagino  * 2. Redistributions in binary form must reproduce the above copyright
11686cdd19SJun-ichiro itojun Hagino  *    notice, this list of conditions and the following disclaimer in the
12686cdd19SJun-ichiro itojun Hagino  *    documentation and/or other materials provided with the distribution.
13686cdd19SJun-ichiro itojun Hagino  * 3. Neither the name of the project nor the names of its contributors
14686cdd19SJun-ichiro itojun Hagino  *    may be used to endorse or promote products derived from this software
15686cdd19SJun-ichiro itojun Hagino  *    without specific prior written permission.
16686cdd19SJun-ichiro itojun Hagino  *
17686cdd19SJun-ichiro itojun Hagino  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18686cdd19SJun-ichiro itojun Hagino  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19686cdd19SJun-ichiro itojun Hagino  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20686cdd19SJun-ichiro itojun Hagino  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21686cdd19SJun-ichiro itojun Hagino  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22686cdd19SJun-ichiro itojun Hagino  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23686cdd19SJun-ichiro itojun Hagino  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24686cdd19SJun-ichiro itojun Hagino  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25686cdd19SJun-ichiro itojun Hagino  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26686cdd19SJun-ichiro itojun Hagino  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27686cdd19SJun-ichiro itojun Hagino  * SUCH DAMAGE.
28b48287a3SDavid E. O'Brien  *
29b48287a3SDavid E. O'Brien  *	$KAME: in6_src.c,v 1.132 2003/08/26 04:42:27 keiichi Exp $
30686cdd19SJun-ichiro itojun Hagino  */
31686cdd19SJun-ichiro itojun Hagino 
32caf43b02SWarner Losh /*-
33686cdd19SJun-ichiro itojun Hagino  * Copyright (c) 1982, 1986, 1991, 1993
34686cdd19SJun-ichiro itojun Hagino  *	The Regents of the University of California.  All rights reserved.
35686cdd19SJun-ichiro itojun Hagino  *
36686cdd19SJun-ichiro itojun Hagino  * Redistribution and use in source and binary forms, with or without
37686cdd19SJun-ichiro itojun Hagino  * modification, are permitted provided that the following conditions
38686cdd19SJun-ichiro itojun Hagino  * are met:
39686cdd19SJun-ichiro itojun Hagino  * 1. Redistributions of source code must retain the above copyright
40686cdd19SJun-ichiro itojun Hagino  *    notice, this list of conditions and the following disclaimer.
41686cdd19SJun-ichiro itojun Hagino  * 2. Redistributions in binary form must reproduce the above copyright
42686cdd19SJun-ichiro itojun Hagino  *    notice, this list of conditions and the following disclaimer in the
43686cdd19SJun-ichiro itojun Hagino  *    documentation and/or other materials provided with the distribution.
44686cdd19SJun-ichiro itojun Hagino  * 4. Neither the name of the University nor the names of its contributors
45686cdd19SJun-ichiro itojun Hagino  *    may be used to endorse or promote products derived from this software
46686cdd19SJun-ichiro itojun Hagino  *    without specific prior written permission.
47686cdd19SJun-ichiro itojun Hagino  *
48686cdd19SJun-ichiro itojun Hagino  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49686cdd19SJun-ichiro itojun Hagino  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50686cdd19SJun-ichiro itojun Hagino  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51686cdd19SJun-ichiro itojun Hagino  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52686cdd19SJun-ichiro itojun Hagino  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53686cdd19SJun-ichiro itojun Hagino  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54686cdd19SJun-ichiro itojun Hagino  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55686cdd19SJun-ichiro itojun Hagino  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56686cdd19SJun-ichiro itojun Hagino  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57686cdd19SJun-ichiro itojun Hagino  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58686cdd19SJun-ichiro itojun Hagino  * SUCH DAMAGE.
59686cdd19SJun-ichiro itojun Hagino  *
60686cdd19SJun-ichiro itojun Hagino  *	@(#)in_pcb.c	8.2 (Berkeley) 1/4/94
61686cdd19SJun-ichiro itojun Hagino  */
62686cdd19SJun-ichiro itojun Hagino 
63b48287a3SDavid E. O'Brien #include <sys/cdefs.h>
64b48287a3SDavid E. O'Brien __FBSDID("$FreeBSD$");
65b48287a3SDavid E. O'Brien 
66686cdd19SJun-ichiro itojun Hagino #include "opt_inet.h"
67686cdd19SJun-ichiro itojun Hagino #include "opt_inet6.h"
68e440aed9SQing Li #include "opt_mpath.h"
69686cdd19SJun-ichiro itojun Hagino 
70686cdd19SJun-ichiro itojun Hagino #include <sys/param.h>
71686cdd19SJun-ichiro itojun Hagino #include <sys/systm.h>
724e7f640dSJohn Baldwin #include <sys/lock.h>
7333841545SHajimu UMEMOTO #include <sys/malloc.h>
74686cdd19SJun-ichiro itojun Hagino #include <sys/mbuf.h>
75acd3428bSRobert Watson #include <sys/priv.h>
76686cdd19SJun-ichiro itojun Hagino #include <sys/protosw.h>
77686cdd19SJun-ichiro itojun Hagino #include <sys/socket.h>
78686cdd19SJun-ichiro itojun Hagino #include <sys/socketvar.h>
797fc91b3fSHajimu UMEMOTO #include <sys/sockio.h>
807fc91b3fSHajimu UMEMOTO #include <sys/sysctl.h>
81686cdd19SJun-ichiro itojun Hagino #include <sys/errno.h>
82686cdd19SJun-ichiro itojun Hagino #include <sys/time.h>
83413628a7SBjoern A. Zeeb #include <sys/jail.h>
844a201dfcSHajimu UMEMOTO #include <sys/kernel.h>
85cc0a3c8cSAndrey V. Elsukov #include <sys/rmlock.h>
865d525653SHajimu UMEMOTO #include <sys/sx.h>
87686cdd19SJun-ichiro itojun Hagino 
88686cdd19SJun-ichiro itojun Hagino #include <net/if.h>
8976039bc8SGleb Smirnoff #include <net/if_var.h>
909452b0d2SQing Li #include <net/if_dl.h>
91686cdd19SJun-ichiro itojun Hagino #include <net/route.h>
926e6b3f7cSQing Li #include <net/if_llatbl.h>
93e440aed9SQing Li #ifdef RADIX_MPATH
94e440aed9SQing Li #include <net/radix_mpath.h>
95e440aed9SQing Li #endif
96686cdd19SJun-ichiro itojun Hagino 
97686cdd19SJun-ichiro itojun Hagino #include <netinet/in.h>
98686cdd19SJun-ichiro itojun Hagino #include <netinet/in_var.h>
99686cdd19SJun-ichiro itojun Hagino #include <netinet/in_systm.h>
100686cdd19SJun-ichiro itojun Hagino #include <netinet/ip.h>
101686cdd19SJun-ichiro itojun Hagino #include <netinet/in_pcb.h>
102dc3c09c8SBjoern A. Zeeb #include <netinet/ip_var.h>
103dc3c09c8SBjoern A. Zeeb #include <netinet/udp.h>
104dc3c09c8SBjoern A. Zeeb #include <netinet/udp_var.h>
1054b79449eSBjoern A. Zeeb 
106686cdd19SJun-ichiro itojun Hagino #include <netinet6/in6_var.h>
107686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h>
108*9977be4aSAlexander V. Chernikov #include <netinet6/in6_fib.h>
109686cdd19SJun-ichiro itojun Hagino #include <netinet6/in6_pcb.h>
110686cdd19SJun-ichiro itojun Hagino #include <netinet6/ip6_var.h>
111a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h>
112686cdd19SJun-ichiro itojun Hagino #include <netinet6/nd6.h>
113686cdd19SJun-ichiro itojun Hagino 
1147fc91b3fSHajimu UMEMOTO static struct mtx addrsel_lock;
1157fc91b3fSHajimu UMEMOTO #define	ADDRSEL_LOCK_INIT()	mtx_init(&addrsel_lock, "addrsel_lock", NULL, MTX_DEF)
1167fc91b3fSHajimu UMEMOTO #define	ADDRSEL_LOCK()		mtx_lock(&addrsel_lock)
1177fc91b3fSHajimu UMEMOTO #define	ADDRSEL_UNLOCK()	mtx_unlock(&addrsel_lock)
1187fc91b3fSHajimu UMEMOTO #define	ADDRSEL_LOCK_ASSERT()	mtx_assert(&addrsel_lock, MA_OWNED)
1197fc91b3fSHajimu UMEMOTO 
1205d525653SHajimu UMEMOTO static struct sx addrsel_sxlock;
1215d525653SHajimu UMEMOTO #define	ADDRSEL_SXLOCK_INIT()	sx_init(&addrsel_sxlock, "addrsel_sxlock")
1225d525653SHajimu UMEMOTO #define	ADDRSEL_SLOCK()		sx_slock(&addrsel_sxlock)
1235d525653SHajimu UMEMOTO #define	ADDRSEL_SUNLOCK()	sx_sunlock(&addrsel_sxlock)
1245d525653SHajimu UMEMOTO #define	ADDRSEL_XLOCK()		sx_xlock(&addrsel_sxlock)
1255d525653SHajimu UMEMOTO #define	ADDRSEL_XUNLOCK()	sx_xunlock(&addrsel_sxlock)
1265d525653SHajimu UMEMOTO 
1277fc91b3fSHajimu UMEMOTO #define ADDR_LABEL_NOTAPP (-1)
1283e288e62SDimitry Andric static VNET_DEFINE(struct in6_addrpolicy, defaultaddrpolicy);
1291e77c105SRobert Watson #define	V_defaultaddrpolicy		VNET(defaultaddrpolicy)
130d6385b1cSHajimu UMEMOTO 
13182cea7e6SBjoern A. Zeeb VNET_DEFINE(int, ip6_prefer_tempaddr) = 0;
13282cea7e6SBjoern A. Zeeb 
1336f56329aSXin LI static int selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
134a1f7e5f8SHajimu UMEMOTO 	struct ip6_moptions *, struct route_in6 *, struct ifnet **,
1356f56329aSXin LI 	struct rtentry **, int, u_int);
1366f56329aSXin LI static int in6_selectif(struct sockaddr_in6 *, struct ip6_pktopts *,
1371b46c7f8SBjoern A. Zeeb 	struct ip6_moptions *, struct route_in6 *ro, struct ifnet **,
1386f56329aSXin LI 	struct ifnet *, u_int);
139d6385b1cSHajimu UMEMOTO 
1409233d8f3SDavid E. O'Brien static struct in6_addrpolicy *lookup_addrsel_policy(struct sockaddr_in6 *);
141d6385b1cSHajimu UMEMOTO 
1429233d8f3SDavid E. O'Brien static void init_policy_queue(void);
1439233d8f3SDavid E. O'Brien static int add_addrsel_policyent(struct in6_addrpolicy *);
1449233d8f3SDavid E. O'Brien static int delete_addrsel_policyent(struct in6_addrpolicy *);
1456f56329aSXin LI static int walk_addrsel_policy(int (*)(struct in6_addrpolicy *, void *),
1466f56329aSXin LI 	void *);
1479233d8f3SDavid E. O'Brien static int dump_addrsel_policyent(struct in6_addrpolicy *, void *);
1489233d8f3SDavid E. O'Brien static struct in6_addrpolicy *match_addrsel_policy(struct sockaddr_in6 *);
1497fc91b3fSHajimu UMEMOTO 
150686cdd19SJun-ichiro itojun Hagino /*
15133841545SHajimu UMEMOTO  * Return an IPv6 address, which is the most appropriate for a given
152686cdd19SJun-ichiro itojun Hagino  * destination and user specified options.
15333841545SHajimu UMEMOTO  * If necessary, this function lookups the routing table and returns
154686cdd19SJun-ichiro itojun Hagino  * an entry to the caller for later use.
155686cdd19SJun-ichiro itojun Hagino  */
156d6385b1cSHajimu UMEMOTO #define REPLACE(r) do {\
1574ff7c740SAndrey V. Elsukov 	IP6STAT_INC(ip6s_sources_rule[(r)]); \
158e7a87117SAndrey V. Elsukov 	rule = (r);	\
159ab569b9cSBjoern A. Zeeb 	/* { \
160ab569b9cSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN], ip6b[INET6_ADDRSTRLEN]; \
161ab569b9cSBjoern A. Zeeb 	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)); \
162ab569b9cSBjoern A. Zeeb 	} */ \
163d6385b1cSHajimu UMEMOTO 	goto replace; \
164d6385b1cSHajimu UMEMOTO } while(0)
165d6385b1cSHajimu UMEMOTO #define NEXT(r) do {\
166ab569b9cSBjoern A. Zeeb 	/* { \
167ab569b9cSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN], ip6b[INET6_ADDRSTRLEN]; \
168ab569b9cSBjoern A. Zeeb 	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)); \
169ab569b9cSBjoern A. Zeeb 	} */ \
170d6385b1cSHajimu UMEMOTO 	goto next;		/* XXX: we can't use 'continue' here */ \
171d6385b1cSHajimu UMEMOTO } while(0)
172d6385b1cSHajimu UMEMOTO #define BREAK(r) do { \
1734ff7c740SAndrey V. Elsukov 	IP6STAT_INC(ip6s_sources_rule[(r)]); \
174e7a87117SAndrey V. Elsukov 	rule = (r);	\
175d6385b1cSHajimu UMEMOTO 	goto out;		/* XXX: we can't use 'break' here */ \
176d6385b1cSHajimu UMEMOTO } while(0)
177d6385b1cSHajimu UMEMOTO 
17888d166bfSBjoern A. Zeeb int
1791272577eSXin LI in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
180f2f877d3SBjoern A. Zeeb     struct inpcb *inp, struct route_in6 *ro, struct ucred *cred,
18188d166bfSBjoern A. Zeeb     struct ifnet **ifpp, struct in6_addr *srcp)
182686cdd19SJun-ichiro itojun Hagino {
183cc0a3c8cSAndrey V. Elsukov 	struct rm_priotracker in6_ifa_tracker;
184877fc3b6SBjoern A. Zeeb 	struct in6_addr dst, tmp;
1851b46c7f8SBjoern A. Zeeb 	struct ifnet *ifp = NULL, *oifp = NULL;
186d6385b1cSHajimu UMEMOTO 	struct in6_ifaddr *ia = NULL, *ia_best = NULL;
187686cdd19SJun-ichiro itojun Hagino 	struct in6_pktinfo *pi = NULL;
188d6385b1cSHajimu UMEMOTO 	int dst_scope = -1, best_scope = -1, best_matchlen = -1;
189d6385b1cSHajimu UMEMOTO 	struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
190d6385b1cSHajimu UMEMOTO 	u_int32_t odstzone;
191d6385b1cSHajimu UMEMOTO 	int prefer_tempaddr;
192e7a87117SAndrey V. Elsukov 	int error, rule;
193f2f877d3SBjoern A. Zeeb 	struct ip6_moptions *mopts;
194e6a27350SHajimu UMEMOTO 
19588d166bfSBjoern A. Zeeb 	KASSERT(srcp != NULL, ("%s: srcp is NULL", __func__));
19688d166bfSBjoern A. Zeeb 
197a1f7e5f8SHajimu UMEMOTO 	dst = dstsock->sin6_addr; /* make a copy for local operation */
1981b46c7f8SBjoern A. Zeeb 	if (ifpp) {
1991b46c7f8SBjoern A. Zeeb 		/*
2001b46c7f8SBjoern A. Zeeb 		 * Save a possibly passed in ifp for in6_selectsrc. Only
2011b46c7f8SBjoern A. Zeeb 		 * neighbor discovery code should use this feature, where
2021b46c7f8SBjoern A. Zeeb 		 * we may know the interface but not the FIB number holding
2031b46c7f8SBjoern A. Zeeb 		 * the connected subnet in case someone deleted it from the
2041b46c7f8SBjoern A. Zeeb 		 * default FIB and we need to check the interface.
2051b46c7f8SBjoern A. Zeeb 		 */
2061b46c7f8SBjoern A. Zeeb 		if (*ifpp != NULL)
2071b46c7f8SBjoern A. Zeeb 			oifp = *ifpp;
208a1f7e5f8SHajimu UMEMOTO 		*ifpp = NULL;
2091b46c7f8SBjoern A. Zeeb 	}
210686cdd19SJun-ichiro itojun Hagino 
211a55b8b20SBjoern A. Zeeb 	if (inp != NULL) {
212a55b8b20SBjoern A. Zeeb 		INP_LOCK_ASSERT(inp);
213f2f877d3SBjoern A. Zeeb 		mopts = inp->in6p_moptions;
214a55b8b20SBjoern A. Zeeb 	} else {
215f2f877d3SBjoern A. Zeeb 		mopts = NULL;
216a55b8b20SBjoern A. Zeeb 	}
217f2f877d3SBjoern A. Zeeb 
218686cdd19SJun-ichiro itojun Hagino 	/*
219686cdd19SJun-ichiro itojun Hagino 	 * If the source address is explicitly specified by the caller,
220d6385b1cSHajimu UMEMOTO 	 * check if the requested source address is indeed a unicast address
221d6385b1cSHajimu UMEMOTO 	 * assigned to the node, and can be used as the packet's source
222d6385b1cSHajimu UMEMOTO 	 * address.  If everything is okay, use the address as source.
223686cdd19SJun-ichiro itojun Hagino 	 */
224686cdd19SJun-ichiro itojun Hagino 	if (opts && (pi = opts->ip6po_pktinfo) &&
225d6385b1cSHajimu UMEMOTO 	    !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
226d6385b1cSHajimu UMEMOTO 		struct sockaddr_in6 srcsock;
227d6385b1cSHajimu UMEMOTO 		struct in6_ifaddr *ia6;
228d6385b1cSHajimu UMEMOTO 
229d6385b1cSHajimu UMEMOTO 		/* get the outgoing interface */
2301b46c7f8SBjoern A. Zeeb 		if ((error = in6_selectif(dstsock, opts, mopts, ro, &ifp, oifp,
23181d5d46bSBjoern A. Zeeb 		    (inp != NULL) ? inp->inp_inc.inc_fibnum : RT_DEFAULT_FIB))
23281d5d46bSBjoern A. Zeeb 		    != 0)
23388d166bfSBjoern A. Zeeb 			return (error);
23468efda09SHajimu UMEMOTO 
235686cdd19SJun-ichiro itojun Hagino 		/*
236d6385b1cSHajimu UMEMOTO 		 * determine the appropriate zone id of the source based on
237d6385b1cSHajimu UMEMOTO 		 * the zone of the destination and the outgoing interface.
238a1f7e5f8SHajimu UMEMOTO 		 * If the specified address is ambiguous wrt the scope zone,
239a1f7e5f8SHajimu UMEMOTO 		 * the interface must be specified; otherwise, ifa_ifwithaddr()
240a1f7e5f8SHajimu UMEMOTO 		 * will fail matching the address.
241d6385b1cSHajimu UMEMOTO 		 */
242d6385b1cSHajimu UMEMOTO 		bzero(&srcsock, sizeof(srcsock));
243d6385b1cSHajimu UMEMOTO 		srcsock.sin6_family = AF_INET6;
244d6385b1cSHajimu UMEMOTO 		srcsock.sin6_len = sizeof(srcsock);
245d6385b1cSHajimu UMEMOTO 		srcsock.sin6_addr = pi->ipi6_addr;
246d6385b1cSHajimu UMEMOTO 		if (ifp) {
24788d166bfSBjoern A. Zeeb 			error = in6_setscope(&srcsock.sin6_addr, ifp, NULL);
24888d166bfSBjoern A. Zeeb 			if (error)
24988d166bfSBjoern A. Zeeb 				return (error);
250d6385b1cSHajimu UMEMOTO 		}
25188d166bfSBjoern A. Zeeb 		if (cred != NULL && (error = prison_local_ip6(cred,
252b89e82ddSJamie Gritton 		    &srcsock.sin6_addr, (inp != NULL &&
253b89e82ddSJamie Gritton 		    (inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
25488d166bfSBjoern A. Zeeb 			return (error);
255a1f7e5f8SHajimu UMEMOTO 
2568c0fec80SRobert Watson 		ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(
2578c0fec80SRobert Watson 		    (struct sockaddr *)&srcsock);
258d6385b1cSHajimu UMEMOTO 		if (ia6 == NULL ||
259d6385b1cSHajimu UMEMOTO 		    (ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) {
2608c0fec80SRobert Watson 			if (ia6 != NULL)
2618c0fec80SRobert Watson 				ifa_free(&ia6->ia_ifa);
26288d166bfSBjoern A. Zeeb 			return (EADDRNOTAVAIL);
263d6385b1cSHajimu UMEMOTO 		}
264d6385b1cSHajimu UMEMOTO 		pi->ipi6_addr = srcsock.sin6_addr; /* XXX: this overrides pi */
265a1f7e5f8SHajimu UMEMOTO 		if (ifpp)
266a1f7e5f8SHajimu UMEMOTO 			*ifpp = ifp;
26788d166bfSBjoern A. Zeeb 		bcopy(&ia6->ia_addr.sin6_addr, srcp, sizeof(*srcp));
2688c0fec80SRobert Watson 		ifa_free(&ia6->ia_ifa);
26988d166bfSBjoern A. Zeeb 		return (0);
270d6385b1cSHajimu UMEMOTO 	}
271d6385b1cSHajimu UMEMOTO 
272d6385b1cSHajimu UMEMOTO 	/*
273d6385b1cSHajimu UMEMOTO 	 * Otherwise, if the socket has already bound the source, just use it.
274686cdd19SJun-ichiro itojun Hagino 	 */
275f2f877d3SBjoern A. Zeeb 	if (inp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
276b89e82ddSJamie Gritton 		if (cred != NULL &&
27788d166bfSBjoern A. Zeeb 		    (error = prison_local_ip6(cred, &inp->in6p_laddr,
278b89e82ddSJamie Gritton 		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
27988d166bfSBjoern A. Zeeb 			return (error);
28088d166bfSBjoern A. Zeeb 		bcopy(&inp->in6p_laddr, srcp, sizeof(*srcp));
28188d166bfSBjoern A. Zeeb 		return (0);
282f2f877d3SBjoern A. Zeeb 	}
283686cdd19SJun-ichiro itojun Hagino 
284686cdd19SJun-ichiro itojun Hagino 	/*
285592bcae8SBjoern A. Zeeb 	 * Bypass source address selection and use the primary jail IP
286592bcae8SBjoern A. Zeeb 	 * if requested.
287592bcae8SBjoern A. Zeeb 	 */
288592bcae8SBjoern A. Zeeb 	if (cred != NULL && !prison_saddrsel_ip6(cred, srcp))
289592bcae8SBjoern A. Zeeb 		return (0);
290592bcae8SBjoern A. Zeeb 
291592bcae8SBjoern A. Zeeb 	/*
292d6385b1cSHajimu UMEMOTO 	 * If the address is not specified, choose the best one based on
293d6385b1cSHajimu UMEMOTO 	 * the outgoing interface and the destination address.
294686cdd19SJun-ichiro itojun Hagino 	 */
295d6385b1cSHajimu UMEMOTO 	/* get the outgoing interface */
2961b46c7f8SBjoern A. Zeeb 	if ((error = in6_selectif(dstsock, opts, mopts, ro, &ifp, oifp,
29781d5d46bSBjoern A. Zeeb 	    (inp != NULL) ? inp->inp_inc.inc_fibnum : RT_DEFAULT_FIB)) != 0)
29888d166bfSBjoern A. Zeeb 		return (error);
299686cdd19SJun-ichiro itojun Hagino 
300d6385b1cSHajimu UMEMOTO #ifdef DIAGNOSTIC
301d6385b1cSHajimu UMEMOTO 	if (ifp == NULL)	/* this should not happen */
302d6385b1cSHajimu UMEMOTO 		panic("in6_selectsrc: NULL ifp");
303d6385b1cSHajimu UMEMOTO #endif
30488d166bfSBjoern A. Zeeb 	error = in6_setscope(&dst, ifp, &odstzone);
30588d166bfSBjoern A. Zeeb 	if (error)
30688d166bfSBjoern A. Zeeb 		return (error);
307a1f7e5f8SHajimu UMEMOTO 
308e7a87117SAndrey V. Elsukov 	rule = 0;
309cc0a3c8cSAndrey V. Elsukov 	IN6_IFADDR_RLOCK(&in6_ifa_tracker);
31080af0152SRobert Watson 	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
311d6385b1cSHajimu UMEMOTO 		int new_scope = -1, new_matchlen = -1;
312d6385b1cSHajimu UMEMOTO 		struct in6_addrpolicy *new_policy = NULL;
313d6385b1cSHajimu UMEMOTO 		u_int32_t srczone, osrczone, dstzone;
314a1f7e5f8SHajimu UMEMOTO 		struct in6_addr src;
315d6385b1cSHajimu UMEMOTO 		struct ifnet *ifp1 = ia->ia_ifp;
316d6385b1cSHajimu UMEMOTO 
317d6385b1cSHajimu UMEMOTO 		/*
318d6385b1cSHajimu UMEMOTO 		 * We'll never take an address that breaks the scope zone
319d6385b1cSHajimu UMEMOTO 		 * of the destination.  We also skip an address if its zone
320d6385b1cSHajimu UMEMOTO 		 * does not contain the outgoing interface.
321d6385b1cSHajimu UMEMOTO 		 * XXX: we should probably use sin6_scope_id here.
322d6385b1cSHajimu UMEMOTO 		 */
323a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&dst, ifp1, &dstzone) ||
324d6385b1cSHajimu UMEMOTO 		    odstzone != dstzone) {
325d6385b1cSHajimu UMEMOTO 			continue;
326d6385b1cSHajimu UMEMOTO 		}
327a1f7e5f8SHajimu UMEMOTO 		src = ia->ia_addr.sin6_addr;
328a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&src, ifp, &osrczone) ||
329a1f7e5f8SHajimu UMEMOTO 		    in6_setscope(&src, ifp1, &srczone) ||
330d6385b1cSHajimu UMEMOTO 		    osrczone != srczone) {
331d6385b1cSHajimu UMEMOTO 			continue;
332686cdd19SJun-ichiro itojun Hagino 		}
333686cdd19SJun-ichiro itojun Hagino 
334d6385b1cSHajimu UMEMOTO 		/* avoid unusable addresses */
335d6385b1cSHajimu UMEMOTO 		if ((ia->ia6_flags &
336d6385b1cSHajimu UMEMOTO 		     (IN6_IFF_NOTREADY | IN6_IFF_ANYCAST | IN6_IFF_DETACHED))) {
337d6385b1cSHajimu UMEMOTO 				continue;
338d6385b1cSHajimu UMEMOTO 		}
339603724d3SBjoern A. Zeeb 		if (!V_ip6_use_deprecated && IFA6_IS_DEPRECATED(ia))
340d6385b1cSHajimu UMEMOTO 			continue;
341d6385b1cSHajimu UMEMOTO 
342877fc3b6SBjoern A. Zeeb 		/* If jailed only take addresses of the jail into account. */
343413628a7SBjoern A. Zeeb 		if (cred != NULL &&
344877fc3b6SBjoern A. Zeeb 		    prison_check_ip6(cred, &ia->ia_addr.sin6_addr) != 0)
345413628a7SBjoern A. Zeeb 			continue;
346413628a7SBjoern A. Zeeb 
347d6385b1cSHajimu UMEMOTO 		/* Rule 1: Prefer same address */
348a1f7e5f8SHajimu UMEMOTO 		if (IN6_ARE_ADDR_EQUAL(&dst, &ia->ia_addr.sin6_addr)) {
349d6385b1cSHajimu UMEMOTO 			ia_best = ia;
350d6385b1cSHajimu UMEMOTO 			BREAK(1); /* there should be no better candidate */
351d6385b1cSHajimu UMEMOTO 		}
352d6385b1cSHajimu UMEMOTO 
353d6385b1cSHajimu UMEMOTO 		if (ia_best == NULL)
354d6385b1cSHajimu UMEMOTO 			REPLACE(0);
355d6385b1cSHajimu UMEMOTO 
356d6385b1cSHajimu UMEMOTO 		/* Rule 2: Prefer appropriate scope */
357d6385b1cSHajimu UMEMOTO 		if (dst_scope < 0)
358a1f7e5f8SHajimu UMEMOTO 			dst_scope = in6_addrscope(&dst);
359d6385b1cSHajimu UMEMOTO 		new_scope = in6_addrscope(&ia->ia_addr.sin6_addr);
360d6385b1cSHajimu UMEMOTO 		if (IN6_ARE_SCOPE_CMP(best_scope, new_scope) < 0) {
361d6385b1cSHajimu UMEMOTO 			if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0)
362d6385b1cSHajimu UMEMOTO 				REPLACE(2);
363d6385b1cSHajimu UMEMOTO 			NEXT(2);
364d6385b1cSHajimu UMEMOTO 		} else if (IN6_ARE_SCOPE_CMP(new_scope, best_scope) < 0) {
365d6385b1cSHajimu UMEMOTO 			if (IN6_ARE_SCOPE_CMP(new_scope, dst_scope) < 0)
366d6385b1cSHajimu UMEMOTO 				NEXT(2);
367d6385b1cSHajimu UMEMOTO 			REPLACE(2);
368d6385b1cSHajimu UMEMOTO 		}
369d6385b1cSHajimu UMEMOTO 
370d6385b1cSHajimu UMEMOTO 		/*
371d6385b1cSHajimu UMEMOTO 		 * Rule 3: Avoid deprecated addresses.  Note that the case of
372d6385b1cSHajimu UMEMOTO 		 * !ip6_use_deprecated is already rejected above.
373d6385b1cSHajimu UMEMOTO 		 */
374d6385b1cSHajimu UMEMOTO 		if (!IFA6_IS_DEPRECATED(ia_best) && IFA6_IS_DEPRECATED(ia))
375d6385b1cSHajimu UMEMOTO 			NEXT(3);
376d6385b1cSHajimu UMEMOTO 		if (IFA6_IS_DEPRECATED(ia_best) && !IFA6_IS_DEPRECATED(ia))
377d6385b1cSHajimu UMEMOTO 			REPLACE(3);
378d6385b1cSHajimu UMEMOTO 
379d6385b1cSHajimu UMEMOTO 		/* Rule 4: Prefer home addresses */
380d6385b1cSHajimu UMEMOTO 		/*
381d6385b1cSHajimu UMEMOTO 		 * XXX: This is a TODO.  We should probably merge the MIP6
382d6385b1cSHajimu UMEMOTO 		 * case above.
383d6385b1cSHajimu UMEMOTO 		 */
384d6385b1cSHajimu UMEMOTO 
385d6385b1cSHajimu UMEMOTO 		/* Rule 5: Prefer outgoing interface */
386164051ceSHajimu UMEMOTO 		if (!(ND_IFINFO(ifp)->flags & ND6_IFF_NO_PREFER_IFACE)) {
387d6385b1cSHajimu UMEMOTO 			if (ia_best->ia_ifp == ifp && ia->ia_ifp != ifp)
388d6385b1cSHajimu UMEMOTO 				NEXT(5);
389d6385b1cSHajimu UMEMOTO 			if (ia_best->ia_ifp != ifp && ia->ia_ifp == ifp)
390d6385b1cSHajimu UMEMOTO 				REPLACE(5);
391164051ceSHajimu UMEMOTO 		}
392d6385b1cSHajimu UMEMOTO 
393d6385b1cSHajimu UMEMOTO 		/*
394d6385b1cSHajimu UMEMOTO 		 * Rule 6: Prefer matching label
395d6385b1cSHajimu UMEMOTO 		 * Note that best_policy should be non-NULL here.
396d6385b1cSHajimu UMEMOTO 		 */
397d6385b1cSHajimu UMEMOTO 		if (dst_policy == NULL)
398d6385b1cSHajimu UMEMOTO 			dst_policy = lookup_addrsel_policy(dstsock);
399d6385b1cSHajimu UMEMOTO 		if (dst_policy->label != ADDR_LABEL_NOTAPP) {
400d6385b1cSHajimu UMEMOTO 			new_policy = lookup_addrsel_policy(&ia->ia_addr);
401d6385b1cSHajimu UMEMOTO 			if (dst_policy->label == best_policy->label &&
402d6385b1cSHajimu UMEMOTO 			    dst_policy->label != new_policy->label)
403d6385b1cSHajimu UMEMOTO 				NEXT(6);
404d6385b1cSHajimu UMEMOTO 			if (dst_policy->label != best_policy->label &&
405d6385b1cSHajimu UMEMOTO 			    dst_policy->label == new_policy->label)
406d6385b1cSHajimu UMEMOTO 				REPLACE(6);
407d6385b1cSHajimu UMEMOTO 		}
408d6385b1cSHajimu UMEMOTO 
409d6385b1cSHajimu UMEMOTO 		/*
410d6385b1cSHajimu UMEMOTO 		 * Rule 7: Prefer public addresses.
411d6385b1cSHajimu UMEMOTO 		 * We allow users to reverse the logic by configuring
412d6385b1cSHajimu UMEMOTO 		 * a sysctl variable, so that privacy conscious users can
413d6385b1cSHajimu UMEMOTO 		 * always prefer temporary addresses.
414d6385b1cSHajimu UMEMOTO 		 */
415d6385b1cSHajimu UMEMOTO 		if (opts == NULL ||
416d6385b1cSHajimu UMEMOTO 		    opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_SYSTEM) {
417603724d3SBjoern A. Zeeb 			prefer_tempaddr = V_ip6_prefer_tempaddr;
418d6385b1cSHajimu UMEMOTO 		} else if (opts->ip6po_prefer_tempaddr ==
419d6385b1cSHajimu UMEMOTO 		    IP6PO_TEMPADDR_NOTPREFER) {
420d6385b1cSHajimu UMEMOTO 			prefer_tempaddr = 0;
421d6385b1cSHajimu UMEMOTO 		} else
422d6385b1cSHajimu UMEMOTO 			prefer_tempaddr = 1;
423d6385b1cSHajimu UMEMOTO 		if (!(ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
424d6385b1cSHajimu UMEMOTO 		    (ia->ia6_flags & IN6_IFF_TEMPORARY)) {
425d6385b1cSHajimu UMEMOTO 			if (prefer_tempaddr)
426d6385b1cSHajimu UMEMOTO 				REPLACE(7);
427d6385b1cSHajimu UMEMOTO 			else
428d6385b1cSHajimu UMEMOTO 				NEXT(7);
429d6385b1cSHajimu UMEMOTO 		}
430d6385b1cSHajimu UMEMOTO 		if ((ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
431d6385b1cSHajimu UMEMOTO 		    !(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
432d6385b1cSHajimu UMEMOTO 			if (prefer_tempaddr)
433d6385b1cSHajimu UMEMOTO 				NEXT(7);
434d6385b1cSHajimu UMEMOTO 			else
435d6385b1cSHajimu UMEMOTO 				REPLACE(7);
436d6385b1cSHajimu UMEMOTO 		}
437d6385b1cSHajimu UMEMOTO 
438d6385b1cSHajimu UMEMOTO 		/*
439d6385b1cSHajimu UMEMOTO 		 * Rule 8: prefer addresses on alive interfaces.
440d6385b1cSHajimu UMEMOTO 		 * This is a KAME specific rule.
441d6385b1cSHajimu UMEMOTO 		 */
442d6385b1cSHajimu UMEMOTO 		if ((ia_best->ia_ifp->if_flags & IFF_UP) &&
443d6385b1cSHajimu UMEMOTO 		    !(ia->ia_ifp->if_flags & IFF_UP))
444d6385b1cSHajimu UMEMOTO 			NEXT(8);
445d6385b1cSHajimu UMEMOTO 		if (!(ia_best->ia_ifp->if_flags & IFF_UP) &&
446d6385b1cSHajimu UMEMOTO 		    (ia->ia_ifp->if_flags & IFF_UP))
447d6385b1cSHajimu UMEMOTO 			REPLACE(8);
448d6385b1cSHajimu UMEMOTO 
449d6385b1cSHajimu UMEMOTO 		/*
450d6e6b994SAndrey V. Elsukov 		 * Rule 9: prefer address with better virtual status.
451d6e6b994SAndrey V. Elsukov 		 */
452d6e6b994SAndrey V. Elsukov 		if (ifa_preferred(&ia_best->ia_ifa, &ia->ia_ifa))
453d6e6b994SAndrey V. Elsukov 			REPLACE(9);
454ccc53de9SAndrey V. Elsukov 		if (ifa_preferred(&ia->ia_ifa, &ia_best->ia_ifa))
455ccc53de9SAndrey V. Elsukov 			NEXT(9);
456d6e6b994SAndrey V. Elsukov 
457d6e6b994SAndrey V. Elsukov 		/*
4585dbfa43fSAndrey V. Elsukov 		 * Rule 10: prefer address with `prefer_source' flag.
4595dbfa43fSAndrey V. Elsukov 		 */
4605dbfa43fSAndrey V. Elsukov 		if ((ia_best->ia6_flags & IN6_IFF_PREFER_SOURCE) == 0 &&
4615dbfa43fSAndrey V. Elsukov 		    (ia->ia6_flags & IN6_IFF_PREFER_SOURCE) != 0)
4625dbfa43fSAndrey V. Elsukov 			REPLACE(10);
4635dbfa43fSAndrey V. Elsukov 		if ((ia_best->ia6_flags & IN6_IFF_PREFER_SOURCE) != 0 &&
4645dbfa43fSAndrey V. Elsukov 		    (ia->ia6_flags & IN6_IFF_PREFER_SOURCE) == 0)
4655dbfa43fSAndrey V. Elsukov 			NEXT(10);
4665dbfa43fSAndrey V. Elsukov 
4675dbfa43fSAndrey V. Elsukov 		/*
468d6385b1cSHajimu UMEMOTO 		 * Rule 14: Use longest matching prefix.
469d6385b1cSHajimu UMEMOTO 		 * Note: in the address selection draft, this rule is
470d6385b1cSHajimu UMEMOTO 		 * documented as "Rule 8".  However, since it is also
471d6385b1cSHajimu UMEMOTO 		 * documented that this rule can be overridden, we assign
472d6385b1cSHajimu UMEMOTO 		 * a large number so that it is easy to assign smaller numbers
473d6385b1cSHajimu UMEMOTO 		 * to more preferred rules.
474d6385b1cSHajimu UMEMOTO 		 */
475a1f7e5f8SHajimu UMEMOTO 		new_matchlen = in6_matchlen(&ia->ia_addr.sin6_addr, &dst);
476d6385b1cSHajimu UMEMOTO 		if (best_matchlen < new_matchlen)
477d6385b1cSHajimu UMEMOTO 			REPLACE(14);
478d6385b1cSHajimu UMEMOTO 		if (new_matchlen < best_matchlen)
479d6385b1cSHajimu UMEMOTO 			NEXT(14);
480d6385b1cSHajimu UMEMOTO 
481d6385b1cSHajimu UMEMOTO 		/* Rule 15 is reserved. */
482d6385b1cSHajimu UMEMOTO 
483d6385b1cSHajimu UMEMOTO 		/*
484d6385b1cSHajimu UMEMOTO 		 * Last resort: just keep the current candidate.
485d6385b1cSHajimu UMEMOTO 		 * Or, do we need more rules?
486d6385b1cSHajimu UMEMOTO 		 */
487d6385b1cSHajimu UMEMOTO 		continue;
488d6385b1cSHajimu UMEMOTO 
489d6385b1cSHajimu UMEMOTO 	  replace:
490d6385b1cSHajimu UMEMOTO 		ia_best = ia;
491d6385b1cSHajimu UMEMOTO 		best_scope = (new_scope >= 0 ? new_scope :
492d6385b1cSHajimu UMEMOTO 			      in6_addrscope(&ia_best->ia_addr.sin6_addr));
493d6385b1cSHajimu UMEMOTO 		best_policy = (new_policy ? new_policy :
494d6385b1cSHajimu UMEMOTO 			       lookup_addrsel_policy(&ia_best->ia_addr));
495d6385b1cSHajimu UMEMOTO 		best_matchlen = (new_matchlen >= 0 ? new_matchlen :
496d6385b1cSHajimu UMEMOTO 				 in6_matchlen(&ia_best->ia_addr.sin6_addr,
497a1f7e5f8SHajimu UMEMOTO 					      &dst));
498d6385b1cSHajimu UMEMOTO 
499d6385b1cSHajimu UMEMOTO 	  next:
500d6385b1cSHajimu UMEMOTO 		continue;
501d6385b1cSHajimu UMEMOTO 
502d6385b1cSHajimu UMEMOTO 	  out:
503d6385b1cSHajimu UMEMOTO 		break;
504d6385b1cSHajimu UMEMOTO 	}
505d6385b1cSHajimu UMEMOTO 
506d1da0a06SRobert Watson 	if ((ia = ia_best) == NULL) {
507cc0a3c8cSAndrey V. Elsukov 		IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
508e7a87117SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_none);
50988d166bfSBjoern A. Zeeb 		return (EADDRNOTAVAIL);
510d1da0a06SRobert Watson 	}
511686cdd19SJun-ichiro itojun Hagino 
512877fc3b6SBjoern A. Zeeb 	/*
513877fc3b6SBjoern A. Zeeb 	 * At this point at least one of the addresses belonged to the jail
514877fc3b6SBjoern A. Zeeb 	 * but it could still be, that we want to further restrict it, e.g.
515877fc3b6SBjoern A. Zeeb 	 * theoratically IN6_IS_ADDR_LOOPBACK.
516877fc3b6SBjoern A. Zeeb 	 * It must not be IN6_IS_ADDR_UNSPECIFIED anymore.
517877fc3b6SBjoern A. Zeeb 	 * prison_local_ip6() will fix an IN6_IS_ADDR_LOOPBACK but should
518877fc3b6SBjoern A. Zeeb 	 * let all others previously selected pass.
519877fc3b6SBjoern A. Zeeb 	 * Use tmp to not change ::1 on lo0 to the primary jail address.
520877fc3b6SBjoern A. Zeeb 	 */
521877fc3b6SBjoern A. Zeeb 	tmp = ia->ia_addr.sin6_addr;
522877fc3b6SBjoern A. Zeeb 	if (cred != NULL && prison_local_ip6(cred, &tmp, (inp != NULL &&
523877fc3b6SBjoern A. Zeeb 	    (inp->inp_flags & IN6P_IPV6_V6ONLY) != 0)) != 0) {
524cc0a3c8cSAndrey V. Elsukov 		IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
525e7a87117SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_none);
526877fc3b6SBjoern A. Zeeb 		return (EADDRNOTAVAIL);
527877fc3b6SBjoern A. Zeeb 	}
528877fc3b6SBjoern A. Zeeb 
529a1f7e5f8SHajimu UMEMOTO 	if (ifpp)
530a1f7e5f8SHajimu UMEMOTO 		*ifpp = ifp;
531a1f7e5f8SHajimu UMEMOTO 
532877fc3b6SBjoern A. Zeeb 	bcopy(&tmp, srcp, sizeof(*srcp));
5334ff7c740SAndrey V. Elsukov 	if (ia->ia_ifp == ifp)
5344ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_sameif[best_scope]);
5354ff7c740SAndrey V. Elsukov 	else
5364ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_otherif[best_scope]);
5374ff7c740SAndrey V. Elsukov 	if (dst_scope == best_scope)
5384ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_samescope[best_scope]);
5394ff7c740SAndrey V. Elsukov 	else
5404ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_otherscope[best_scope]);
5414ff7c740SAndrey V. Elsukov 	if (IFA6_IS_DEPRECATED(ia))
5424ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_deprecated[best_scope]);
543cc0a3c8cSAndrey V. Elsukov 	IN6_IFADDR_RUNLOCK(&in6_ifa_tracker);
54488d166bfSBjoern A. Zeeb 	return (0);
545d6385b1cSHajimu UMEMOTO }
546d6385b1cSHajimu UMEMOTO 
5471272577eSXin LI /*
5481272577eSXin LI  * clone - meaningful only for bsdi and freebsd
5491272577eSXin LI  */
550d6385b1cSHajimu UMEMOTO static int
5511272577eSXin LI selectroute(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
5521272577eSXin LI     struct ip6_moptions *mopts, struct route_in6 *ro,
5535aa7e8edSBjoern A. Zeeb     struct ifnet **retifp, struct rtentry **retrt, int norouteok, u_int fibnum)
554d6385b1cSHajimu UMEMOTO {
555d6385b1cSHajimu UMEMOTO 	int error = 0;
556d6385b1cSHajimu UMEMOTO 	struct ifnet *ifp = NULL;
557d6385b1cSHajimu UMEMOTO 	struct rtentry *rt = NULL;
558d6385b1cSHajimu UMEMOTO 	struct sockaddr_in6 *sin6_next;
559d6385b1cSHajimu UMEMOTO 	struct in6_pktinfo *pi = NULL;
560d6385b1cSHajimu UMEMOTO 	struct in6_addr *dst = &dstsock->sin6_addr;
561ea455de9SAndrey V. Elsukov 	uint32_t zoneid;
562d6385b1cSHajimu UMEMOTO #if 0
5631d54aa3bSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN];
5641d54aa3bSBjoern A. Zeeb 
565d6385b1cSHajimu UMEMOTO 	if (dstsock->sin6_addr.s6_addr32[0] == 0 &&
566d6385b1cSHajimu UMEMOTO 	    dstsock->sin6_addr.s6_addr32[1] == 0 &&
567d6385b1cSHajimu UMEMOTO 	    !IN6_IS_ADDR_LOOPBACK(&dstsock->sin6_addr)) {
568d6385b1cSHajimu UMEMOTO 		printf("in6_selectroute: strange destination %s\n",
5691d54aa3bSBjoern A. Zeeb 		       ip6_sprintf(ip6buf, &dstsock->sin6_addr));
570d6385b1cSHajimu UMEMOTO 	} else {
571d6385b1cSHajimu UMEMOTO 		printf("in6_selectroute: destination = %s%%%d\n",
5721d54aa3bSBjoern A. Zeeb 		       ip6_sprintf(ip6buf, &dstsock->sin6_addr),
573d6385b1cSHajimu UMEMOTO 		       dstsock->sin6_scope_id); /* for debug */
574d6385b1cSHajimu UMEMOTO 	}
575d6385b1cSHajimu UMEMOTO #endif
576d6385b1cSHajimu UMEMOTO 
577d6385b1cSHajimu UMEMOTO 	/* If the caller specify the outgoing interface explicitly, use it. */
578d6385b1cSHajimu UMEMOTO 	if (opts && (pi = opts->ip6po_pktinfo) != NULL && pi->ipi6_ifindex) {
579d6385b1cSHajimu UMEMOTO 		/* XXX boundary check is assumed to be already done. */
580d6385b1cSHajimu UMEMOTO 		ifp = ifnet_byindex(pi->ipi6_ifindex);
581d6385b1cSHajimu UMEMOTO 		if (ifp != NULL &&
582a1f7e5f8SHajimu UMEMOTO 		    (norouteok || retrt == NULL ||
583a1f7e5f8SHajimu UMEMOTO 		    IN6_IS_ADDR_MULTICAST(dst))) {
584d6385b1cSHajimu UMEMOTO 			/*
585cd0fdcf7SHajimu UMEMOTO 			 * we do not have to check or get the route for
586d6385b1cSHajimu UMEMOTO 			 * multicast.
587d6385b1cSHajimu UMEMOTO 			 */
588d6385b1cSHajimu UMEMOTO 			goto done;
589d6385b1cSHajimu UMEMOTO 		} else
590d6385b1cSHajimu UMEMOTO 			goto getroute;
591d6385b1cSHajimu UMEMOTO 	}
592ea455de9SAndrey V. Elsukov 	/*
593d6385b1cSHajimu UMEMOTO 	 * If the destination address is a multicast address and the outgoing
594d6385b1cSHajimu UMEMOTO 	 * interface for the address is specified by the caller, use it.
595d6385b1cSHajimu UMEMOTO 	 */
596d6385b1cSHajimu UMEMOTO 	if (IN6_IS_ADDR_MULTICAST(dst) &&
597d6385b1cSHajimu UMEMOTO 	    mopts != NULL && (ifp = mopts->im6o_multicast_ifp) != NULL) {
598d6385b1cSHajimu UMEMOTO 		goto done; /* we do not need a route for multicast. */
599d6385b1cSHajimu UMEMOTO 	}
60045d1880aSAndrey V. Elsukov 	/*
60145d1880aSAndrey V. Elsukov 	 * If destination address is LLA or link- or node-local multicast,
60245d1880aSAndrey V. Elsukov 	 * use it's embedded scope zone id to determine outgoing interface.
60345d1880aSAndrey V. Elsukov 	 */
60445d1880aSAndrey V. Elsukov 	if (IN6_IS_ADDR_MC_LINKLOCAL(dst) ||
60545d1880aSAndrey V. Elsukov 	    IN6_IS_ADDR_MC_NODELOCAL(dst)) {
60645d1880aSAndrey V. Elsukov 		zoneid = ntohs(in6_getscope(dst));
60745d1880aSAndrey V. Elsukov 		if (zoneid > 0) {
60845d1880aSAndrey V. Elsukov 			ifp = in6_getlinkifnet(zoneid);
60945d1880aSAndrey V. Elsukov 			goto done;
61045d1880aSAndrey V. Elsukov 		}
61145d1880aSAndrey V. Elsukov 	}
612d6385b1cSHajimu UMEMOTO 
613d6385b1cSHajimu UMEMOTO   getroute:
614d6385b1cSHajimu UMEMOTO 	/*
615d6385b1cSHajimu UMEMOTO 	 * If the next hop address for the packet is specified by the caller,
616d6385b1cSHajimu UMEMOTO 	 * use it as the gateway.
617d6385b1cSHajimu UMEMOTO 	 */
618d6385b1cSHajimu UMEMOTO 	if (opts && opts->ip6po_nexthop) {
619d6385b1cSHajimu UMEMOTO 		struct route_in6 *ron;
620d6385b1cSHajimu UMEMOTO 
621d6385b1cSHajimu UMEMOTO 		sin6_next = satosin6(opts->ip6po_nexthop);
62251a01bafSAndrey V. Elsukov 		if (IN6_IS_ADDR_LINKLOCAL(&sin6_next->sin6_addr)) {
62351a01bafSAndrey V. Elsukov 			/*
62451a01bafSAndrey V. Elsukov 			 * Next hop is LLA, thus it should be neighbor.
62551a01bafSAndrey V. Elsukov 			 * Determine outgoing interface by zone index.
62651a01bafSAndrey V. Elsukov 			 */
62751a01bafSAndrey V. Elsukov 			zoneid = ntohs(in6_getscope(&sin6_next->sin6_addr));
62851a01bafSAndrey V. Elsukov 			if (zoneid > 0) {
62951a01bafSAndrey V. Elsukov 				ifp = in6_getlinkifnet(zoneid);
630d6385b1cSHajimu UMEMOTO 				goto done;
631d6385b1cSHajimu UMEMOTO 			}
63251a01bafSAndrey V. Elsukov 		}
633d6385b1cSHajimu UMEMOTO 		ron = &opts->ip6po_nextroute;
63451a01bafSAndrey V. Elsukov 		/* Use a cached route if it exists and is valid. */
63551a01bafSAndrey V. Elsukov 		if (ron->ro_rt != NULL && (
63651a01bafSAndrey V. Elsukov 		    (ron->ro_rt->rt_flags & RTF_UP) == 0 ||
63751a01bafSAndrey V. Elsukov 		    ron->ro_dst.sin6_family != AF_INET6 ||
63851a01bafSAndrey V. Elsukov 		    !IN6_ARE_ADDR_EQUAL(&ron->ro_dst.sin6_addr,
63951a01bafSAndrey V. Elsukov 			&sin6_next->sin6_addr)))
64051a01bafSAndrey V. Elsukov 			RO_RTFREE(ron);
64151a01bafSAndrey V. Elsukov 		if (ron->ro_rt == NULL) {
64251a01bafSAndrey V. Elsukov 			ron->ro_dst = *sin6_next;
64351a01bafSAndrey V. Elsukov 			in6_rtalloc(ron, fibnum); /* multi path case? */
64451a01bafSAndrey V. Elsukov 		}
6456e6b3f7cSQing Li 		/*
64651a01bafSAndrey V. Elsukov 		 * The node identified by that address must be a
64751a01bafSAndrey V. Elsukov 		 * neighbor of the sending host.
6486e6b3f7cSQing Li 		 */
649d6385b1cSHajimu UMEMOTO 		if (ron->ro_rt == NULL ||
65051a01bafSAndrey V. Elsukov 		    (ron->ro_rt->rt_flags & RTF_GATEWAY) != 0)
651d6385b1cSHajimu UMEMOTO 			error = EHOSTUNREACH;
652d6385b1cSHajimu UMEMOTO 		goto done;
653d6385b1cSHajimu UMEMOTO 	}
654d6385b1cSHajimu UMEMOTO 
655d6385b1cSHajimu UMEMOTO 	/*
656d6385b1cSHajimu UMEMOTO 	 * Use a cached route if it exists and is valid, else try to allocate
657d6385b1cSHajimu UMEMOTO 	 * a new one.  Note that we should check the address family of the
658d6385b1cSHajimu UMEMOTO 	 * cached destination, in case of sharing the cache with IPv4.
659686cdd19SJun-ichiro itojun Hagino 	 */
660686cdd19SJun-ichiro itojun Hagino 	if (ro) {
661686cdd19SJun-ichiro itojun Hagino 		if (ro->ro_rt &&
66254c1b882SHajimu UMEMOTO 		    (!(ro->ro_rt->rt_flags & RTF_UP) ||
663d6385b1cSHajimu UMEMOTO 		     ((struct sockaddr *)(&ro->ro_dst))->sa_family != AF_INET6 ||
66454c1b882SHajimu UMEMOTO 		     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr,
66554c1b882SHajimu UMEMOTO 		     dst))) {
666686cdd19SJun-ichiro itojun Hagino 			RTFREE(ro->ro_rt);
667d6385b1cSHajimu UMEMOTO 			ro->ro_rt = (struct rtentry *)NULL;
668686cdd19SJun-ichiro itojun Hagino 		}
669d6385b1cSHajimu UMEMOTO 		if (ro->ro_rt == (struct rtentry *)NULL) {
67033841545SHajimu UMEMOTO 			struct sockaddr_in6 *sa6;
67133841545SHajimu UMEMOTO 
672686cdd19SJun-ichiro itojun Hagino 			/* No route yet, so try to acquire one */
673686cdd19SJun-ichiro itojun Hagino 			bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
67433841545SHajimu UMEMOTO 			sa6 = (struct sockaddr_in6 *)&ro->ro_dst;
675d6385b1cSHajimu UMEMOTO 			*sa6 = *dstsock;
676e6a27350SHajimu UMEMOTO 			sa6->sin6_scope_id = 0;
67797d8d152SAndre Oppermann 
678e440aed9SQing Li #ifdef RADIX_MPATH
67981d5d46bSBjoern A. Zeeb 				rtalloc_mpath_fib((struct route *)ro,
68081d5d46bSBjoern A. Zeeb 				    ntohl(sa6->sin6_addr.s6_addr32[3]), fibnum);
681e440aed9SQing Li #else
68281d5d46bSBjoern A. Zeeb 				ro->ro_rt = in6_rtalloc1((struct sockaddr *)
68381d5d46bSBjoern A. Zeeb 				    &ro->ro_dst, 0, 0UL, fibnum);
68437bdc280SSam Leffler 				if (ro->ro_rt)
685d1dd20beSSam Leffler 					RT_UNLOCK(ro->ro_rt);
6866e6b3f7cSQing Li #endif
687686cdd19SJun-ichiro itojun Hagino 		}
688686cdd19SJun-ichiro itojun Hagino 
689686cdd19SJun-ichiro itojun Hagino 		/*
690d6385b1cSHajimu UMEMOTO 		 * do not care about the result if we have the nexthop
691d6385b1cSHajimu UMEMOTO 		 * explicitly specified.
692686cdd19SJun-ichiro itojun Hagino 		 */
693d6385b1cSHajimu UMEMOTO 		if (opts && opts->ip6po_nexthop)
694d6385b1cSHajimu UMEMOTO 			goto done;
695686cdd19SJun-ichiro itojun Hagino 
696686cdd19SJun-ichiro itojun Hagino 		if (ro->ro_rt) {
697d6385b1cSHajimu UMEMOTO 			ifp = ro->ro_rt->rt_ifp;
698d6385b1cSHajimu UMEMOTO 
699d6385b1cSHajimu UMEMOTO 			if (ifp == NULL) { /* can this really happen? */
700d6385b1cSHajimu UMEMOTO 				RTFREE(ro->ro_rt);
701d6385b1cSHajimu UMEMOTO 				ro->ro_rt = NULL;
702686cdd19SJun-ichiro itojun Hagino 			}
703686cdd19SJun-ichiro itojun Hagino 		}
704d6385b1cSHajimu UMEMOTO 		if (ro->ro_rt == NULL)
705d6385b1cSHajimu UMEMOTO 			error = EHOSTUNREACH;
706d6385b1cSHajimu UMEMOTO 		rt = ro->ro_rt;
707d6385b1cSHajimu UMEMOTO 
708d6385b1cSHajimu UMEMOTO 		/*
709d6385b1cSHajimu UMEMOTO 		 * Check if the outgoing interface conflicts with
710d6385b1cSHajimu UMEMOTO 		 * the interface specified by ipi6_ifindex (if specified).
711d6385b1cSHajimu UMEMOTO 		 * Note that loopback interface is always okay.
712d6385b1cSHajimu UMEMOTO 		 * (this may happen when we are sending a packet to one of
713d6385b1cSHajimu UMEMOTO 		 *  our own addresses.)
714d6385b1cSHajimu UMEMOTO 		 */
715403cbcf5SGeorge V. Neville-Neil 		if (ifp && opts && opts->ip6po_pktinfo &&
71668efda09SHajimu UMEMOTO 		    opts->ip6po_pktinfo->ipi6_ifindex) {
717d6385b1cSHajimu UMEMOTO 			if (!(ifp->if_flags & IFF_LOOPBACK) &&
718d6385b1cSHajimu UMEMOTO 			    ifp->if_index !=
719d6385b1cSHajimu UMEMOTO 			    opts->ip6po_pktinfo->ipi6_ifindex) {
720d6385b1cSHajimu UMEMOTO 				error = EHOSTUNREACH;
721d6385b1cSHajimu UMEMOTO 				goto done;
722d6385b1cSHajimu UMEMOTO 			}
723d6385b1cSHajimu UMEMOTO 		}
724686cdd19SJun-ichiro itojun Hagino 	}
725686cdd19SJun-ichiro itojun Hagino 
726d6385b1cSHajimu UMEMOTO   done:
727d6385b1cSHajimu UMEMOTO 	if (ifp == NULL && rt == NULL) {
728d6385b1cSHajimu UMEMOTO 		/*
729d6385b1cSHajimu UMEMOTO 		 * This can happen if the caller did not pass a cached route
730d6385b1cSHajimu UMEMOTO 		 * nor any other hints.  We treat this case an error.
731d6385b1cSHajimu UMEMOTO 		 */
732d6385b1cSHajimu UMEMOTO 		error = EHOSTUNREACH;
733d6385b1cSHajimu UMEMOTO 	}
734d6385b1cSHajimu UMEMOTO 	if (error == EHOSTUNREACH)
7359cb8d207SAndrey V. Elsukov 		IP6STAT_INC(ip6s_noroute);
736d6385b1cSHajimu UMEMOTO 
7379452b0d2SQing Li 	if (retifp != NULL) {
738d6385b1cSHajimu UMEMOTO 		*retifp = ifp;
7399452b0d2SQing Li 
7409452b0d2SQing Li 		/*
7419452b0d2SQing Li 		 * Adjust the "outgoing" interface.  If we're going to loop
7429452b0d2SQing Li 		 * the packet back to ourselves, the ifp would be the loopback
7439452b0d2SQing Li 		 * interface. However, we'd rather know the interface associated
7449452b0d2SQing Li 		 * to the destination address (which should probably be one of
7459452b0d2SQing Li 		 * our own addresses.)
7469452b0d2SQing Li 		 */
7479452b0d2SQing Li 		if (rt) {
7489452b0d2SQing Li 			if ((rt->rt_ifp->if_flags & IFF_LOOPBACK) &&
7499452b0d2SQing Li 			    (rt->rt_gateway->sa_family == AF_LINK))
7509452b0d2SQing Li 				*retifp =
7519452b0d2SQing Li 					ifnet_byindex(((struct sockaddr_dl *)
7529452b0d2SQing Li 						       rt->rt_gateway)->sdl_index);
7539452b0d2SQing Li 		}
7549452b0d2SQing Li 	}
7559452b0d2SQing Li 
756d6385b1cSHajimu UMEMOTO 	if (retrt != NULL)
757d6385b1cSHajimu UMEMOTO 		*retrt = rt;	/* rt may be NULL */
758d6385b1cSHajimu UMEMOTO 
759d6385b1cSHajimu UMEMOTO 	return (error);
760686cdd19SJun-ichiro itojun Hagino }
761686cdd19SJun-ichiro itojun Hagino 
762a1f7e5f8SHajimu UMEMOTO static int
7631272577eSXin LI in6_selectif(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
76481d5d46bSBjoern A. Zeeb     struct ip6_moptions *mopts, struct route_in6 *ro, struct ifnet **retifp,
7655aa7e8edSBjoern A. Zeeb     struct ifnet *oifp, u_int fibnum)
766a1f7e5f8SHajimu UMEMOTO {
767a1f7e5f8SHajimu UMEMOTO 	int error;
768a1f7e5f8SHajimu UMEMOTO 	struct route_in6 sro;
769a1f7e5f8SHajimu UMEMOTO 	struct rtentry *rt = NULL;
770a1f7e5f8SHajimu UMEMOTO 
7711b46c7f8SBjoern A. Zeeb 	KASSERT(retifp != NULL, ("%s: retifp is NULL", __func__));
7721b46c7f8SBjoern A. Zeeb 
773a1f7e5f8SHajimu UMEMOTO 	if (ro == NULL) {
774a1f7e5f8SHajimu UMEMOTO 		bzero(&sro, sizeof(sro));
775a1f7e5f8SHajimu UMEMOTO 		ro = &sro;
776a1f7e5f8SHajimu UMEMOTO 	}
777a1f7e5f8SHajimu UMEMOTO 
778a1f7e5f8SHajimu UMEMOTO 	if ((error = selectroute(dstsock, opts, mopts, ro, retifp,
77981d5d46bSBjoern A. Zeeb 	    &rt, 1, fibnum)) != 0) {
780f8366b03SSeigo Tanimura 		if (ro == &sro && rt && rt == sro.ro_rt)
781a1f7e5f8SHajimu UMEMOTO 			RTFREE(rt);
7821b46c7f8SBjoern A. Zeeb 		/* Help ND. See oifp comment in in6_selectsrc(). */
7831b46c7f8SBjoern A. Zeeb 		if (oifp != NULL && fibnum == RT_DEFAULT_FIB) {
7841b46c7f8SBjoern A. Zeeb 			*retifp = oifp;
7851b46c7f8SBjoern A. Zeeb 			error = 0;
7861b46c7f8SBjoern A. Zeeb 		}
787a1f7e5f8SHajimu UMEMOTO 		return (error);
788a1f7e5f8SHajimu UMEMOTO 	}
789a1f7e5f8SHajimu UMEMOTO 
790a1f7e5f8SHajimu UMEMOTO 	/*
791a1f7e5f8SHajimu UMEMOTO 	 * do not use a rejected or black hole route.
792a1f7e5f8SHajimu UMEMOTO 	 * XXX: this check should be done in the L2 output routine.
793a1f7e5f8SHajimu UMEMOTO 	 * However, if we skipped this check here, we'd see the following
794a1f7e5f8SHajimu UMEMOTO 	 * scenario:
795a1f7e5f8SHajimu UMEMOTO 	 * - install a rejected route for a scoped address prefix
796a1f7e5f8SHajimu UMEMOTO 	 *   (like fe80::/10)
797a1f7e5f8SHajimu UMEMOTO 	 * - send a packet to a destination that matches the scoped prefix,
798a1f7e5f8SHajimu UMEMOTO 	 *   with ambiguity about the scope zone.
799a1f7e5f8SHajimu UMEMOTO 	 * - pick the outgoing interface from the route, and disambiguate the
800a1f7e5f8SHajimu UMEMOTO 	 *   scope zone with the interface.
801a1f7e5f8SHajimu UMEMOTO 	 * - ip6_output() would try to get another route with the "new"
802a1f7e5f8SHajimu UMEMOTO 	 *   destination, which may be valid.
803a1f7e5f8SHajimu UMEMOTO 	 * - we'd see no error on output.
804a1f7e5f8SHajimu UMEMOTO 	 * Although this may not be very harmful, it should still be confusing.
805a1f7e5f8SHajimu UMEMOTO 	 * We thus reject the case here.
806a1f7e5f8SHajimu UMEMOTO 	 */
807a1f7e5f8SHajimu UMEMOTO 	if (rt && (rt->rt_flags & (RTF_REJECT | RTF_BLACKHOLE))) {
808a1f7e5f8SHajimu UMEMOTO 		int flags = (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
809a1f7e5f8SHajimu UMEMOTO 
810f8366b03SSeigo Tanimura 		if (ro == &sro && rt && rt == sro.ro_rt)
811a1f7e5f8SHajimu UMEMOTO 			RTFREE(rt);
812a1f7e5f8SHajimu UMEMOTO 		return (flags);
813a1f7e5f8SHajimu UMEMOTO 	}
814a1f7e5f8SHajimu UMEMOTO 
815f8366b03SSeigo Tanimura 	if (ro == &sro && rt && rt == sro.ro_rt)
816a1f7e5f8SHajimu UMEMOTO 		RTFREE(rt);
817a1f7e5f8SHajimu UMEMOTO 	return (0);
818a1f7e5f8SHajimu UMEMOTO }
819a1f7e5f8SHajimu UMEMOTO 
8201272577eSXin LI /*
82181d5d46bSBjoern A. Zeeb  * Public wrapper function to selectroute().
82281d5d46bSBjoern A. Zeeb  *
82381d5d46bSBjoern A. Zeeb  * XXX-BZ in6_selectroute() should and will grow the FIB argument. The
82481d5d46bSBjoern A. Zeeb  * in6_selectroute_fib() function is only there for backward compat on stable.
8251272577eSXin LI  */
826a1f7e5f8SHajimu UMEMOTO int
8271272577eSXin LI in6_selectroute(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
8281272577eSXin LI     struct ip6_moptions *mopts, struct route_in6 *ro,
8296e6b3f7cSQing Li     struct ifnet **retifp, struct rtentry **retrt)
830a1f7e5f8SHajimu UMEMOTO {
8311272577eSXin LI 
832a1f7e5f8SHajimu UMEMOTO 	return (selectroute(dstsock, opts, mopts, ro, retifp,
83381d5d46bSBjoern A. Zeeb 	    retrt, 0, RT_DEFAULT_FIB));
834a1f7e5f8SHajimu UMEMOTO }
835a1f7e5f8SHajimu UMEMOTO 
83681d5d46bSBjoern A. Zeeb #ifndef BURN_BRIDGES
83781d5d46bSBjoern A. Zeeb int
83881d5d46bSBjoern A. Zeeb in6_selectroute_fib(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
83981d5d46bSBjoern A. Zeeb     struct ip6_moptions *mopts, struct route_in6 *ro,
8405aa7e8edSBjoern A. Zeeb     struct ifnet **retifp, struct rtentry **retrt, u_int fibnum)
84181d5d46bSBjoern A. Zeeb {
84281d5d46bSBjoern A. Zeeb 
84381d5d46bSBjoern A. Zeeb 	return (selectroute(dstsock, opts, mopts, ro, retifp,
84481d5d46bSBjoern A. Zeeb 	    retrt, 0, fibnum));
84581d5d46bSBjoern A. Zeeb }
84681d5d46bSBjoern A. Zeeb #endif
84781d5d46bSBjoern A. Zeeb 
848686cdd19SJun-ichiro itojun Hagino /*
849686cdd19SJun-ichiro itojun Hagino  * Default hop limit selection. The precedence is as follows:
850686cdd19SJun-ichiro itojun Hagino  * 1. Hoplimit value specified via ioctl.
851686cdd19SJun-ichiro itojun Hagino  * 2. (If the outgoing interface is detected) the current
852686cdd19SJun-ichiro itojun Hagino  *     hop limit of the interface specified by router advertisement.
853686cdd19SJun-ichiro itojun Hagino  * 3. The system default hoplimit.
854686cdd19SJun-ichiro itojun Hagino  */
855686cdd19SJun-ichiro itojun Hagino int
856fc384fa5SBjoern A. Zeeb in6_selecthlim(struct inpcb *in6p, struct ifnet *ifp)
857686cdd19SJun-ichiro itojun Hagino {
8581272577eSXin LI 
859686cdd19SJun-ichiro itojun Hagino 	if (in6p && in6p->in6p_hops >= 0)
860686cdd19SJun-ichiro itojun Hagino 		return (in6p->in6p_hops);
861686cdd19SJun-ichiro itojun Hagino 	else if (ifp)
86231b1bfe1SHajimu UMEMOTO 		return (ND_IFINFO(ifp)->chlim);
86397d8d152SAndre Oppermann 	else if (in6p && !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
864*9977be4aSAlexander V. Chernikov 		struct nhop6_basic nh6;
865*9977be4aSAlexander V. Chernikov 		struct in6_addr dst;
866*9977be4aSAlexander V. Chernikov 		uint32_t fibnum, scopeid;
867*9977be4aSAlexander V. Chernikov 		int hlim;
86897d8d152SAndre Oppermann 
869*9977be4aSAlexander V. Chernikov 		fibnum = in6p->inp_inc.inc_fibnum;
870*9977be4aSAlexander V. Chernikov 		in6_splitscope(&in6p->in6p_faddr, &dst, &scopeid);
871*9977be4aSAlexander V. Chernikov 		if (fib6_lookup_nh_basic(fibnum, &dst, scopeid, 0, 0, &nh6)==0){
872*9977be4aSAlexander V. Chernikov 			hlim = ND_IFINFO(nh6.nh_ifp)->chlim;
873*9977be4aSAlexander V. Chernikov 			return (hlim);
874f8315b5fSBjoern A. Zeeb 		}
87597d8d152SAndre Oppermann 	}
876603724d3SBjoern A. Zeeb 	return (V_ip6_defhlim);
877686cdd19SJun-ichiro itojun Hagino }
878686cdd19SJun-ichiro itojun Hagino 
879686cdd19SJun-ichiro itojun Hagino /*
880686cdd19SJun-ichiro itojun Hagino  * XXX: this is borrowed from in6_pcbbind(). If possible, we should
881686cdd19SJun-ichiro itojun Hagino  * share this function by all *bsd*...
882686cdd19SJun-ichiro itojun Hagino  */
883686cdd19SJun-ichiro itojun Hagino int
8841272577eSXin LI in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct ucred *cred)
885686cdd19SJun-ichiro itojun Hagino {
886686cdd19SJun-ichiro itojun Hagino 	struct socket *so = inp->inp_socket;
887efc76f72SBjoern A. Zeeb 	u_int16_t lport = 0;
88868e0d7e0SRobert Watson 	int error, lookupflags = 0;
889efc76f72SBjoern A. Zeeb #ifdef INVARIANTS
890686cdd19SJun-ichiro itojun Hagino 	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
891efc76f72SBjoern A. Zeeb #endif
892686cdd19SJun-ichiro itojun Hagino 
8938501a69cSRobert Watson 	INP_WLOCK_ASSERT(inp);
894fa046d87SRobert Watson 	INP_HASH_WLOCK_ASSERT(pcbinfo);
8958deea4a8SRobert Watson 
896b89e82ddSJamie Gritton 	error = prison_local_ip6(cred, laddr,
897b89e82ddSJamie Gritton 	    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0));
898b89e82ddSJamie Gritton 	if (error)
899b89e82ddSJamie Gritton 		return(error);
900413628a7SBjoern A. Zeeb 
901686cdd19SJun-ichiro itojun Hagino 	/* XXX: this is redundant when called from in6_pcbbind */
902686cdd19SJun-ichiro itojun Hagino 	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
90368e0d7e0SRobert Watson 		lookupflags = INPLOOKUP_WILDCARD;
904686cdd19SJun-ichiro itojun Hagino 
905686cdd19SJun-ichiro itojun Hagino 	inp->inp_flags |= INP_ANONPORT;
906686cdd19SJun-ichiro itojun Hagino 
90768e0d7e0SRobert Watson 	error = in_pcb_lport(inp, NULL, &lport, cred, lookupflags);
908efc76f72SBjoern A. Zeeb 	if (error != 0)
909efc76f72SBjoern A. Zeeb 		return (error);
910686cdd19SJun-ichiro itojun Hagino 
911686cdd19SJun-ichiro itojun Hagino 	inp->inp_lport = lport;
912686cdd19SJun-ichiro itojun Hagino 	if (in_pcbinshash(inp) != 0) {
913686cdd19SJun-ichiro itojun Hagino 		inp->in6p_laddr = in6addr_any;
914686cdd19SJun-ichiro itojun Hagino 		inp->inp_lport = 0;
915686cdd19SJun-ichiro itojun Hagino 		return (EAGAIN);
916686cdd19SJun-ichiro itojun Hagino 	}
917686cdd19SJun-ichiro itojun Hagino 
918686cdd19SJun-ichiro itojun Hagino 	return (0);
919686cdd19SJun-ichiro itojun Hagino }
920686cdd19SJun-ichiro itojun Hagino 
9217fc91b3fSHajimu UMEMOTO void
9221272577eSXin LI addrsel_policy_init(void)
9237fc91b3fSHajimu UMEMOTO {
9247fc91b3fSHajimu UMEMOTO 
9257fc91b3fSHajimu UMEMOTO 	init_policy_queue();
9267fc91b3fSHajimu UMEMOTO 
9277fc91b3fSHajimu UMEMOTO 	/* initialize the "last resort" policy */
928603724d3SBjoern A. Zeeb 	bzero(&V_defaultaddrpolicy, sizeof(V_defaultaddrpolicy));
929603724d3SBjoern A. Zeeb 	V_defaultaddrpolicy.label = ADDR_LABEL_NOTAPP;
9301ed81b73SMarko Zec 
9311ed81b73SMarko Zec 	if (!IS_DEFAULT_VNET(curvnet))
9321ed81b73SMarko Zec 		return;
9331ed81b73SMarko Zec 
9341ed81b73SMarko Zec 	ADDRSEL_LOCK_INIT();
9351ed81b73SMarko Zec 	ADDRSEL_SXLOCK_INIT();
9367fc91b3fSHajimu UMEMOTO }
9377fc91b3fSHajimu UMEMOTO 
938d6385b1cSHajimu UMEMOTO static struct in6_addrpolicy *
9391272577eSXin LI lookup_addrsel_policy(struct sockaddr_in6 *key)
940d6385b1cSHajimu UMEMOTO {
941d6385b1cSHajimu UMEMOTO 	struct in6_addrpolicy *match = NULL;
942d6385b1cSHajimu UMEMOTO 
943d6385b1cSHajimu UMEMOTO 	ADDRSEL_LOCK();
944d6385b1cSHajimu UMEMOTO 	match = match_addrsel_policy(key);
945d6385b1cSHajimu UMEMOTO 
946d6385b1cSHajimu UMEMOTO 	if (match == NULL)
947603724d3SBjoern A. Zeeb 		match = &V_defaultaddrpolicy;
948d6385b1cSHajimu UMEMOTO 	else
949d6385b1cSHajimu UMEMOTO 		match->use++;
950d6385b1cSHajimu UMEMOTO 	ADDRSEL_UNLOCK();
951d6385b1cSHajimu UMEMOTO 
952d6385b1cSHajimu UMEMOTO 	return (match);
953d6385b1cSHajimu UMEMOTO }
954d6385b1cSHajimu UMEMOTO 
9557fc91b3fSHajimu UMEMOTO /*
9567fc91b3fSHajimu UMEMOTO  * Subroutines to manage the address selection policy table via sysctl.
9577fc91b3fSHajimu UMEMOTO  */
9587fc91b3fSHajimu UMEMOTO struct walkarg {
9597fc91b3fSHajimu UMEMOTO 	struct sysctl_req *w_req;
9607fc91b3fSHajimu UMEMOTO };
9617fc91b3fSHajimu UMEMOTO 
9627fc91b3fSHajimu UMEMOTO static int in6_src_sysctl(SYSCTL_HANDLER_ARGS);
9637fc91b3fSHajimu UMEMOTO SYSCTL_DECL(_net_inet6_ip6);
9646472ac3dSEd Schouten static SYSCTL_NODE(_net_inet6_ip6, IPV6CTL_ADDRCTLPOLICY, addrctlpolicy,
9657fc91b3fSHajimu UMEMOTO 	CTLFLAG_RD, in6_src_sysctl, "");
9667fc91b3fSHajimu UMEMOTO 
9677fc91b3fSHajimu UMEMOTO static int
9687fc91b3fSHajimu UMEMOTO in6_src_sysctl(SYSCTL_HANDLER_ARGS)
9697fc91b3fSHajimu UMEMOTO {
9707fc91b3fSHajimu UMEMOTO 	struct walkarg w;
9717fc91b3fSHajimu UMEMOTO 
9727fc91b3fSHajimu UMEMOTO 	if (req->newptr)
9737fc91b3fSHajimu UMEMOTO 		return EPERM;
9747fc91b3fSHajimu UMEMOTO 
9757fc91b3fSHajimu UMEMOTO 	bzero(&w, sizeof(w));
9767fc91b3fSHajimu UMEMOTO 	w.w_req = req;
9777fc91b3fSHajimu UMEMOTO 
9787fc91b3fSHajimu UMEMOTO 	return (walk_addrsel_policy(dump_addrsel_policyent, &w));
9797fc91b3fSHajimu UMEMOTO }
9807fc91b3fSHajimu UMEMOTO 
9817fc91b3fSHajimu UMEMOTO int
9821272577eSXin LI in6_src_ioctl(u_long cmd, caddr_t data)
9837fc91b3fSHajimu UMEMOTO {
9847fc91b3fSHajimu UMEMOTO 	struct in6_addrpolicy ent0;
9857fc91b3fSHajimu UMEMOTO 
9867fc91b3fSHajimu UMEMOTO 	if (cmd != SIOCAADDRCTL_POLICY && cmd != SIOCDADDRCTL_POLICY)
9877fc91b3fSHajimu UMEMOTO 		return (EOPNOTSUPP); /* check for safety */
9887fc91b3fSHajimu UMEMOTO 
9897fc91b3fSHajimu UMEMOTO 	ent0 = *(struct in6_addrpolicy *)data;
9907fc91b3fSHajimu UMEMOTO 
9917fc91b3fSHajimu UMEMOTO 	if (ent0.label == ADDR_LABEL_NOTAPP)
9927fc91b3fSHajimu UMEMOTO 		return (EINVAL);
9937fc91b3fSHajimu UMEMOTO 	/* check if the prefix mask is consecutive. */
9947fc91b3fSHajimu UMEMOTO 	if (in6_mask2len(&ent0.addrmask.sin6_addr, NULL) < 0)
9957fc91b3fSHajimu UMEMOTO 		return (EINVAL);
9967fc91b3fSHajimu UMEMOTO 	/* clear trailing garbages (if any) of the prefix address. */
9971dc8f6a8SAlexander V. Chernikov 	IN6_MASK_ADDR(&ent0.addr.sin6_addr, &ent0.addrmask.sin6_addr);
9987fc91b3fSHajimu UMEMOTO 	ent0.use = 0;
9997fc91b3fSHajimu UMEMOTO 
10007fc91b3fSHajimu UMEMOTO 	switch (cmd) {
10017fc91b3fSHajimu UMEMOTO 	case SIOCAADDRCTL_POLICY:
10027fc91b3fSHajimu UMEMOTO 		return (add_addrsel_policyent(&ent0));
10037fc91b3fSHajimu UMEMOTO 	case SIOCDADDRCTL_POLICY:
10047fc91b3fSHajimu UMEMOTO 		return (delete_addrsel_policyent(&ent0));
10057fc91b3fSHajimu UMEMOTO 	}
10067fc91b3fSHajimu UMEMOTO 
10077fc91b3fSHajimu UMEMOTO 	return (0);		/* XXX: compromise compilers */
10087fc91b3fSHajimu UMEMOTO }
10097fc91b3fSHajimu UMEMOTO 
10107fc91b3fSHajimu UMEMOTO /*
10117fc91b3fSHajimu UMEMOTO  * The followings are implementation of the policy table using a
10127fc91b3fSHajimu UMEMOTO  * simple tail queue.
10137fc91b3fSHajimu UMEMOTO  * XXX such details should be hidden.
10147fc91b3fSHajimu UMEMOTO  * XXX implementation using binary tree should be more efficient.
10157fc91b3fSHajimu UMEMOTO  */
10167fc91b3fSHajimu UMEMOTO struct addrsel_policyent {
10177fc91b3fSHajimu UMEMOTO 	TAILQ_ENTRY(addrsel_policyent) ape_entry;
10187fc91b3fSHajimu UMEMOTO 	struct in6_addrpolicy ape_policy;
10197fc91b3fSHajimu UMEMOTO };
10207fc91b3fSHajimu UMEMOTO 
10217fc91b3fSHajimu UMEMOTO TAILQ_HEAD(addrsel_policyhead, addrsel_policyent);
10227fc91b3fSHajimu UMEMOTO 
10233e288e62SDimitry Andric static VNET_DEFINE(struct addrsel_policyhead, addrsel_policytab);
10241e77c105SRobert Watson #define	V_addrsel_policytab		VNET(addrsel_policytab)
10257fc91b3fSHajimu UMEMOTO 
10267fc91b3fSHajimu UMEMOTO static void
10271272577eSXin LI init_policy_queue(void)
10287fc91b3fSHajimu UMEMOTO {
10291272577eSXin LI 
1030603724d3SBjoern A. Zeeb 	TAILQ_INIT(&V_addrsel_policytab);
10317fc91b3fSHajimu UMEMOTO }
10327fc91b3fSHajimu UMEMOTO 
10337fc91b3fSHajimu UMEMOTO static int
10341272577eSXin LI add_addrsel_policyent(struct in6_addrpolicy *newpolicy)
10357fc91b3fSHajimu UMEMOTO {
10367fc91b3fSHajimu UMEMOTO 	struct addrsel_policyent *new, *pol;
10377fc91b3fSHajimu UMEMOTO 
10381ede983cSDag-Erling Smørgrav 	new = malloc(sizeof(*new), M_IFADDR,
1039349b668aSHajimu UMEMOTO 	       M_WAITOK);
10405d525653SHajimu UMEMOTO 	ADDRSEL_XLOCK();
10417fc91b3fSHajimu UMEMOTO 	ADDRSEL_LOCK();
10427fc91b3fSHajimu UMEMOTO 
10437fc91b3fSHajimu UMEMOTO 	/* duplication check */
1044603724d3SBjoern A. Zeeb 	TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
1045c1a049acSSUZUKI Shinsuke 		if (IN6_ARE_ADDR_EQUAL(&newpolicy->addr.sin6_addr,
1046c1a049acSSUZUKI Shinsuke 				       &pol->ape_policy.addr.sin6_addr) &&
1047c1a049acSSUZUKI Shinsuke 		    IN6_ARE_ADDR_EQUAL(&newpolicy->addrmask.sin6_addr,
1048c1a049acSSUZUKI Shinsuke 				       &pol->ape_policy.addrmask.sin6_addr)) {
1049349b668aSHajimu UMEMOTO 			ADDRSEL_UNLOCK();
10505d525653SHajimu UMEMOTO 			ADDRSEL_XUNLOCK();
10511ede983cSDag-Erling Smørgrav 			free(new, M_IFADDR);
10527fc91b3fSHajimu UMEMOTO 			return (EEXIST);	/* or override it? */
10537fc91b3fSHajimu UMEMOTO 		}
10547fc91b3fSHajimu UMEMOTO 	}
10557fc91b3fSHajimu UMEMOTO 
10567fc91b3fSHajimu UMEMOTO 	bzero(new, sizeof(*new));
10577fc91b3fSHajimu UMEMOTO 
10587fc91b3fSHajimu UMEMOTO 	/* XXX: should validate entry */
10597fc91b3fSHajimu UMEMOTO 	new->ape_policy = *newpolicy;
10607fc91b3fSHajimu UMEMOTO 
1061603724d3SBjoern A. Zeeb 	TAILQ_INSERT_TAIL(&V_addrsel_policytab, new, ape_entry);
10627fc91b3fSHajimu UMEMOTO 	ADDRSEL_UNLOCK();
10635d525653SHajimu UMEMOTO 	ADDRSEL_XUNLOCK();
10647fc91b3fSHajimu UMEMOTO 
10657fc91b3fSHajimu UMEMOTO 	return (0);
10667fc91b3fSHajimu UMEMOTO }
10677fc91b3fSHajimu UMEMOTO 
10687fc91b3fSHajimu UMEMOTO static int
10691272577eSXin LI delete_addrsel_policyent(struct in6_addrpolicy *key)
10707fc91b3fSHajimu UMEMOTO {
10717fc91b3fSHajimu UMEMOTO 	struct addrsel_policyent *pol;
10727fc91b3fSHajimu UMEMOTO 
10735d525653SHajimu UMEMOTO 	ADDRSEL_XLOCK();
10747fc91b3fSHajimu UMEMOTO 	ADDRSEL_LOCK();
10757fc91b3fSHajimu UMEMOTO 
10767fc91b3fSHajimu UMEMOTO 	/* search for the entry in the table */
1077603724d3SBjoern A. Zeeb 	TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
1078c1a049acSSUZUKI Shinsuke 		if (IN6_ARE_ADDR_EQUAL(&key->addr.sin6_addr,
1079c1a049acSSUZUKI Shinsuke 		    &pol->ape_policy.addr.sin6_addr) &&
1080c1a049acSSUZUKI Shinsuke 		    IN6_ARE_ADDR_EQUAL(&key->addrmask.sin6_addr,
1081c1a049acSSUZUKI Shinsuke 		    &pol->ape_policy.addrmask.sin6_addr)) {
10827fc91b3fSHajimu UMEMOTO 			break;
10837fc91b3fSHajimu UMEMOTO 		}
10847fc91b3fSHajimu UMEMOTO 	}
1085349b668aSHajimu UMEMOTO 	if (pol == NULL) {
1086349b668aSHajimu UMEMOTO 		ADDRSEL_UNLOCK();
10875d525653SHajimu UMEMOTO 		ADDRSEL_XUNLOCK();
10887fc91b3fSHajimu UMEMOTO 		return (ESRCH);
1089349b668aSHajimu UMEMOTO 	}
10907fc91b3fSHajimu UMEMOTO 
1091603724d3SBjoern A. Zeeb 	TAILQ_REMOVE(&V_addrsel_policytab, pol, ape_entry);
10927fc91b3fSHajimu UMEMOTO 	ADDRSEL_UNLOCK();
10935d525653SHajimu UMEMOTO 	ADDRSEL_XUNLOCK();
1094ecc5c738SAndrey V. Elsukov 	free(pol, M_IFADDR);
10957fc91b3fSHajimu UMEMOTO 
10967fc91b3fSHajimu UMEMOTO 	return (0);
10977fc91b3fSHajimu UMEMOTO }
10987fc91b3fSHajimu UMEMOTO 
10997fc91b3fSHajimu UMEMOTO static int
1100f1e0de69SDavid E. O'Brien walk_addrsel_policy(int (*callback)(struct in6_addrpolicy *, void *), void *w)
11017fc91b3fSHajimu UMEMOTO {
11027fc91b3fSHajimu UMEMOTO 	struct addrsel_policyent *pol;
11037fc91b3fSHajimu UMEMOTO 	int error = 0;
11047fc91b3fSHajimu UMEMOTO 
11055d525653SHajimu UMEMOTO 	ADDRSEL_SLOCK();
1106603724d3SBjoern A. Zeeb 	TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
11075d525653SHajimu UMEMOTO 		if ((error = (*callback)(&pol->ape_policy, w)) != 0) {
11085d525653SHajimu UMEMOTO 			ADDRSEL_SUNLOCK();
11097fc91b3fSHajimu UMEMOTO 			return (error);
1110349b668aSHajimu UMEMOTO 		}
11115d525653SHajimu UMEMOTO 	}
11125d525653SHajimu UMEMOTO 	ADDRSEL_SUNLOCK();
11137fc91b3fSHajimu UMEMOTO 	return (error);
11147fc91b3fSHajimu UMEMOTO }
11157fc91b3fSHajimu UMEMOTO 
11167fc91b3fSHajimu UMEMOTO static int
11171272577eSXin LI dump_addrsel_policyent(struct in6_addrpolicy *pol, void *arg)
11187fc91b3fSHajimu UMEMOTO {
11197fc91b3fSHajimu UMEMOTO 	int error = 0;
11207fc91b3fSHajimu UMEMOTO 	struct walkarg *w = arg;
11217fc91b3fSHajimu UMEMOTO 
11227fc91b3fSHajimu UMEMOTO 	error = SYSCTL_OUT(w->w_req, pol, sizeof(*pol));
11237fc91b3fSHajimu UMEMOTO 
11247fc91b3fSHajimu UMEMOTO 	return (error);
11257fc91b3fSHajimu UMEMOTO }
1126d6385b1cSHajimu UMEMOTO 
1127d6385b1cSHajimu UMEMOTO static struct in6_addrpolicy *
11281272577eSXin LI match_addrsel_policy(struct sockaddr_in6 *key)
1129d6385b1cSHajimu UMEMOTO {
1130d6385b1cSHajimu UMEMOTO 	struct addrsel_policyent *pent;
1131d6385b1cSHajimu UMEMOTO 	struct in6_addrpolicy *bestpol = NULL, *pol;
1132d6385b1cSHajimu UMEMOTO 	int matchlen, bestmatchlen = -1;
1133d6385b1cSHajimu UMEMOTO 	u_char *mp, *ep, *k, *p, m;
1134d6385b1cSHajimu UMEMOTO 
1135603724d3SBjoern A. Zeeb 	TAILQ_FOREACH(pent, &V_addrsel_policytab, ape_entry) {
1136d6385b1cSHajimu UMEMOTO 		matchlen = 0;
1137d6385b1cSHajimu UMEMOTO 
1138d6385b1cSHajimu UMEMOTO 		pol = &pent->ape_policy;
1139d6385b1cSHajimu UMEMOTO 		mp = (u_char *)&pol->addrmask.sin6_addr;
1140d6385b1cSHajimu UMEMOTO 		ep = mp + 16;	/* XXX: scope field? */
1141d6385b1cSHajimu UMEMOTO 		k = (u_char *)&key->sin6_addr;
1142d6385b1cSHajimu UMEMOTO 		p = (u_char *)&pol->addr.sin6_addr;
1143d6385b1cSHajimu UMEMOTO 		for (; mp < ep && *mp; mp++, k++, p++) {
1144d6385b1cSHajimu UMEMOTO 			m = *mp;
1145d6385b1cSHajimu UMEMOTO 			if ((*k & m) != *p)
1146d6385b1cSHajimu UMEMOTO 				goto next; /* not match */
1147d6385b1cSHajimu UMEMOTO 			if (m == 0xff) /* short cut for a typical case */
1148d6385b1cSHajimu UMEMOTO 				matchlen += 8;
1149d6385b1cSHajimu UMEMOTO 			else {
1150d6385b1cSHajimu UMEMOTO 				while (m >= 0x80) {
1151d6385b1cSHajimu UMEMOTO 					matchlen++;
1152d6385b1cSHajimu UMEMOTO 					m <<= 1;
1153d6385b1cSHajimu UMEMOTO 				}
1154d6385b1cSHajimu UMEMOTO 			}
1155d6385b1cSHajimu UMEMOTO 		}
1156d6385b1cSHajimu UMEMOTO 
1157d6385b1cSHajimu UMEMOTO 		/* matched.  check if this is better than the current best. */
1158d6385b1cSHajimu UMEMOTO 		if (bestpol == NULL ||
1159d6385b1cSHajimu UMEMOTO 		    matchlen > bestmatchlen) {
1160d6385b1cSHajimu UMEMOTO 			bestpol = pol;
1161d6385b1cSHajimu UMEMOTO 			bestmatchlen = matchlen;
1162d6385b1cSHajimu UMEMOTO 		}
1163d6385b1cSHajimu UMEMOTO 
1164d6385b1cSHajimu UMEMOTO 	  next:
1165d6385b1cSHajimu UMEMOTO 		continue;
1166d6385b1cSHajimu UMEMOTO 	}
1167d6385b1cSHajimu UMEMOTO 
1168d6385b1cSHajimu UMEMOTO 	return (bestpol);
1169d6385b1cSHajimu UMEMOTO }
1170