xref: /freebsd/sys/netinet6/in6_src.c (revision d6e6b9943b6d5dc9008048d8d8e10a31b5ae0a1b)
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>
855d525653SHajimu UMEMOTO #include <sys/sx.h>
86686cdd19SJun-ichiro itojun Hagino 
87686cdd19SJun-ichiro itojun Hagino #include <net/if.h>
8876039bc8SGleb Smirnoff #include <net/if_var.h>
899452b0d2SQing Li #include <net/if_dl.h>
90686cdd19SJun-ichiro itojun Hagino #include <net/route.h>
916e6b3f7cSQing Li #include <net/if_llatbl.h>
92e440aed9SQing Li #ifdef RADIX_MPATH
93e440aed9SQing Li #include <net/radix_mpath.h>
94e440aed9SQing Li #endif
95686cdd19SJun-ichiro itojun Hagino 
96686cdd19SJun-ichiro itojun Hagino #include <netinet/in.h>
97686cdd19SJun-ichiro itojun Hagino #include <netinet/in_var.h>
98686cdd19SJun-ichiro itojun Hagino #include <netinet/in_systm.h>
99686cdd19SJun-ichiro itojun Hagino #include <netinet/ip.h>
100686cdd19SJun-ichiro itojun Hagino #include <netinet/in_pcb.h>
101dc3c09c8SBjoern A. Zeeb #include <netinet/ip_var.h>
102dc3c09c8SBjoern A. Zeeb #include <netinet/udp.h>
103dc3c09c8SBjoern A. Zeeb #include <netinet/udp_var.h>
1044b79449eSBjoern A. Zeeb 
105686cdd19SJun-ichiro itojun Hagino #include <netinet6/in6_var.h>
106686cdd19SJun-ichiro itojun Hagino #include <netinet/ip6.h>
107686cdd19SJun-ichiro itojun Hagino #include <netinet6/in6_pcb.h>
108686cdd19SJun-ichiro itojun Hagino #include <netinet6/ip6_var.h>
109a1f7e5f8SHajimu UMEMOTO #include <netinet6/scope6_var.h>
110686cdd19SJun-ichiro itojun Hagino #include <netinet6/nd6.h>
111686cdd19SJun-ichiro itojun Hagino 
1127fc91b3fSHajimu UMEMOTO static struct mtx addrsel_lock;
1137fc91b3fSHajimu UMEMOTO #define	ADDRSEL_LOCK_INIT()	mtx_init(&addrsel_lock, "addrsel_lock", NULL, MTX_DEF)
1147fc91b3fSHajimu UMEMOTO #define	ADDRSEL_LOCK()		mtx_lock(&addrsel_lock)
1157fc91b3fSHajimu UMEMOTO #define	ADDRSEL_UNLOCK()	mtx_unlock(&addrsel_lock)
1167fc91b3fSHajimu UMEMOTO #define	ADDRSEL_LOCK_ASSERT()	mtx_assert(&addrsel_lock, MA_OWNED)
1177fc91b3fSHajimu UMEMOTO 
1185d525653SHajimu UMEMOTO static struct sx addrsel_sxlock;
1195d525653SHajimu UMEMOTO #define	ADDRSEL_SXLOCK_INIT()	sx_init(&addrsel_sxlock, "addrsel_sxlock")
1205d525653SHajimu UMEMOTO #define	ADDRSEL_SLOCK()		sx_slock(&addrsel_sxlock)
1215d525653SHajimu UMEMOTO #define	ADDRSEL_SUNLOCK()	sx_sunlock(&addrsel_sxlock)
1225d525653SHajimu UMEMOTO #define	ADDRSEL_XLOCK()		sx_xlock(&addrsel_sxlock)
1235d525653SHajimu UMEMOTO #define	ADDRSEL_XUNLOCK()	sx_xunlock(&addrsel_sxlock)
1245d525653SHajimu UMEMOTO 
1257fc91b3fSHajimu UMEMOTO #define ADDR_LABEL_NOTAPP (-1)
1263e288e62SDimitry Andric static VNET_DEFINE(struct in6_addrpolicy, defaultaddrpolicy);
1271e77c105SRobert Watson #define	V_defaultaddrpolicy		VNET(defaultaddrpolicy)
128d6385b1cSHajimu UMEMOTO 
12982cea7e6SBjoern A. Zeeb VNET_DEFINE(int, ip6_prefer_tempaddr) = 0;
13082cea7e6SBjoern A. Zeeb 
1316f56329aSXin LI static int selectroute(struct sockaddr_in6 *, struct ip6_pktopts *,
132a1f7e5f8SHajimu UMEMOTO 	struct ip6_moptions *, struct route_in6 *, struct ifnet **,
1336f56329aSXin LI 	struct rtentry **, int, u_int);
1346f56329aSXin LI static int in6_selectif(struct sockaddr_in6 *, struct ip6_pktopts *,
1351b46c7f8SBjoern A. Zeeb 	struct ip6_moptions *, struct route_in6 *ro, struct ifnet **,
1366f56329aSXin LI 	struct ifnet *, u_int);
137d6385b1cSHajimu UMEMOTO 
1389233d8f3SDavid E. O'Brien static struct in6_addrpolicy *lookup_addrsel_policy(struct sockaddr_in6 *);
139d6385b1cSHajimu UMEMOTO 
1409233d8f3SDavid E. O'Brien static void init_policy_queue(void);
1419233d8f3SDavid E. O'Brien static int add_addrsel_policyent(struct in6_addrpolicy *);
1429233d8f3SDavid E. O'Brien static int delete_addrsel_policyent(struct in6_addrpolicy *);
1436f56329aSXin LI static int walk_addrsel_policy(int (*)(struct in6_addrpolicy *, void *),
1446f56329aSXin LI 	void *);
1459233d8f3SDavid E. O'Brien static int dump_addrsel_policyent(struct in6_addrpolicy *, void *);
1469233d8f3SDavid E. O'Brien static struct in6_addrpolicy *match_addrsel_policy(struct sockaddr_in6 *);
1477fc91b3fSHajimu UMEMOTO 
148686cdd19SJun-ichiro itojun Hagino /*
14933841545SHajimu UMEMOTO  * Return an IPv6 address, which is the most appropriate for a given
150686cdd19SJun-ichiro itojun Hagino  * destination and user specified options.
15133841545SHajimu UMEMOTO  * If necessary, this function lookups the routing table and returns
152686cdd19SJun-ichiro itojun Hagino  * an entry to the caller for later use.
153686cdd19SJun-ichiro itojun Hagino  */
154d6385b1cSHajimu UMEMOTO #define REPLACE(r) do {\
1554ff7c740SAndrey V. Elsukov 	IP6STAT_INC(ip6s_sources_rule[(r)]); \
156e7a87117SAndrey V. Elsukov 	rule = (r);	\
157ab569b9cSBjoern A. Zeeb 	/* { \
158ab569b9cSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN], ip6b[INET6_ADDRSTRLEN]; \
159ab569b9cSBjoern 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)); \
160ab569b9cSBjoern A. Zeeb 	} */ \
161d6385b1cSHajimu UMEMOTO 	goto replace; \
162d6385b1cSHajimu UMEMOTO } while(0)
163d6385b1cSHajimu UMEMOTO #define NEXT(r) do {\
164ab569b9cSBjoern A. Zeeb 	/* { \
165ab569b9cSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN], ip6b[INET6_ADDRSTRLEN]; \
166ab569b9cSBjoern 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)); \
167ab569b9cSBjoern A. Zeeb 	} */ \
168d6385b1cSHajimu UMEMOTO 	goto next;		/* XXX: we can't use 'continue' here */ \
169d6385b1cSHajimu UMEMOTO } while(0)
170d6385b1cSHajimu UMEMOTO #define BREAK(r) do { \
1714ff7c740SAndrey V. Elsukov 	IP6STAT_INC(ip6s_sources_rule[(r)]); \
172e7a87117SAndrey V. Elsukov 	rule = (r);	\
173d6385b1cSHajimu UMEMOTO 	goto out;		/* XXX: we can't use 'break' here */ \
174d6385b1cSHajimu UMEMOTO } while(0)
175d6385b1cSHajimu UMEMOTO 
17688d166bfSBjoern A. Zeeb int
1771272577eSXin LI in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
178f2f877d3SBjoern A. Zeeb     struct inpcb *inp, struct route_in6 *ro, struct ucred *cred,
17988d166bfSBjoern A. Zeeb     struct ifnet **ifpp, struct in6_addr *srcp)
180686cdd19SJun-ichiro itojun Hagino {
181877fc3b6SBjoern A. Zeeb 	struct in6_addr dst, tmp;
1821b46c7f8SBjoern A. Zeeb 	struct ifnet *ifp = NULL, *oifp = NULL;
183d6385b1cSHajimu UMEMOTO 	struct in6_ifaddr *ia = NULL, *ia_best = NULL;
184686cdd19SJun-ichiro itojun Hagino 	struct in6_pktinfo *pi = NULL;
185d6385b1cSHajimu UMEMOTO 	int dst_scope = -1, best_scope = -1, best_matchlen = -1;
186d6385b1cSHajimu UMEMOTO 	struct in6_addrpolicy *dst_policy = NULL, *best_policy = NULL;
187d6385b1cSHajimu UMEMOTO 	u_int32_t odstzone;
188d6385b1cSHajimu UMEMOTO 	int prefer_tempaddr;
189e7a87117SAndrey V. Elsukov 	int error, rule;
190f2f877d3SBjoern A. Zeeb 	struct ip6_moptions *mopts;
191e6a27350SHajimu UMEMOTO 
19288d166bfSBjoern A. Zeeb 	KASSERT(srcp != NULL, ("%s: srcp is NULL", __func__));
19388d166bfSBjoern A. Zeeb 
194a1f7e5f8SHajimu UMEMOTO 	dst = dstsock->sin6_addr; /* make a copy for local operation */
1951b46c7f8SBjoern A. Zeeb 	if (ifpp) {
1961b46c7f8SBjoern A. Zeeb 		/*
1971b46c7f8SBjoern A. Zeeb 		 * Save a possibly passed in ifp for in6_selectsrc. Only
1981b46c7f8SBjoern A. Zeeb 		 * neighbor discovery code should use this feature, where
1991b46c7f8SBjoern A. Zeeb 		 * we may know the interface but not the FIB number holding
2001b46c7f8SBjoern A. Zeeb 		 * the connected subnet in case someone deleted it from the
2011b46c7f8SBjoern A. Zeeb 		 * default FIB and we need to check the interface.
2021b46c7f8SBjoern A. Zeeb 		 */
2031b46c7f8SBjoern A. Zeeb 		if (*ifpp != NULL)
2041b46c7f8SBjoern A. Zeeb 			oifp = *ifpp;
205a1f7e5f8SHajimu UMEMOTO 		*ifpp = NULL;
2061b46c7f8SBjoern A. Zeeb 	}
207686cdd19SJun-ichiro itojun Hagino 
208a55b8b20SBjoern A. Zeeb 	if (inp != NULL) {
209a55b8b20SBjoern A. Zeeb 		INP_LOCK_ASSERT(inp);
210f2f877d3SBjoern A. Zeeb 		mopts = inp->in6p_moptions;
211a55b8b20SBjoern A. Zeeb 	} else {
212f2f877d3SBjoern A. Zeeb 		mopts = NULL;
213a55b8b20SBjoern A. Zeeb 	}
214f2f877d3SBjoern A. Zeeb 
215686cdd19SJun-ichiro itojun Hagino 	/*
216686cdd19SJun-ichiro itojun Hagino 	 * If the source address is explicitly specified by the caller,
217d6385b1cSHajimu UMEMOTO 	 * check if the requested source address is indeed a unicast address
218d6385b1cSHajimu UMEMOTO 	 * assigned to the node, and can be used as the packet's source
219d6385b1cSHajimu UMEMOTO 	 * address.  If everything is okay, use the address as source.
220686cdd19SJun-ichiro itojun Hagino 	 */
221686cdd19SJun-ichiro itojun Hagino 	if (opts && (pi = opts->ip6po_pktinfo) &&
222d6385b1cSHajimu UMEMOTO 	    !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
223d6385b1cSHajimu UMEMOTO 		struct sockaddr_in6 srcsock;
224d6385b1cSHajimu UMEMOTO 		struct in6_ifaddr *ia6;
225d6385b1cSHajimu UMEMOTO 
226d6385b1cSHajimu UMEMOTO 		/* get the outgoing interface */
2271b46c7f8SBjoern A. Zeeb 		if ((error = in6_selectif(dstsock, opts, mopts, ro, &ifp, oifp,
22881d5d46bSBjoern A. Zeeb 		    (inp != NULL) ? inp->inp_inc.inc_fibnum : RT_DEFAULT_FIB))
22981d5d46bSBjoern A. Zeeb 		    != 0)
23088d166bfSBjoern A. Zeeb 			return (error);
23168efda09SHajimu UMEMOTO 
232686cdd19SJun-ichiro itojun Hagino 		/*
233d6385b1cSHajimu UMEMOTO 		 * determine the appropriate zone id of the source based on
234d6385b1cSHajimu UMEMOTO 		 * the zone of the destination and the outgoing interface.
235a1f7e5f8SHajimu UMEMOTO 		 * If the specified address is ambiguous wrt the scope zone,
236a1f7e5f8SHajimu UMEMOTO 		 * the interface must be specified; otherwise, ifa_ifwithaddr()
237a1f7e5f8SHajimu UMEMOTO 		 * will fail matching the address.
238d6385b1cSHajimu UMEMOTO 		 */
239d6385b1cSHajimu UMEMOTO 		bzero(&srcsock, sizeof(srcsock));
240d6385b1cSHajimu UMEMOTO 		srcsock.sin6_family = AF_INET6;
241d6385b1cSHajimu UMEMOTO 		srcsock.sin6_len = sizeof(srcsock);
242d6385b1cSHajimu UMEMOTO 		srcsock.sin6_addr = pi->ipi6_addr;
243d6385b1cSHajimu UMEMOTO 		if (ifp) {
24488d166bfSBjoern A. Zeeb 			error = in6_setscope(&srcsock.sin6_addr, ifp, NULL);
24588d166bfSBjoern A. Zeeb 			if (error)
24688d166bfSBjoern A. Zeeb 				return (error);
247d6385b1cSHajimu UMEMOTO 		}
24888d166bfSBjoern A. Zeeb 		if (cred != NULL && (error = prison_local_ip6(cred,
249b89e82ddSJamie Gritton 		    &srcsock.sin6_addr, (inp != NULL &&
250b89e82ddSJamie Gritton 		    (inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
25188d166bfSBjoern A. Zeeb 			return (error);
252a1f7e5f8SHajimu UMEMOTO 
2538c0fec80SRobert Watson 		ia6 = (struct in6_ifaddr *)ifa_ifwithaddr(
2548c0fec80SRobert Watson 		    (struct sockaddr *)&srcsock);
255d6385b1cSHajimu UMEMOTO 		if (ia6 == NULL ||
256d6385b1cSHajimu UMEMOTO 		    (ia6->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY))) {
2578c0fec80SRobert Watson 			if (ia6 != NULL)
2588c0fec80SRobert Watson 				ifa_free(&ia6->ia_ifa);
25988d166bfSBjoern A. Zeeb 			return (EADDRNOTAVAIL);
260d6385b1cSHajimu UMEMOTO 		}
261d6385b1cSHajimu UMEMOTO 		pi->ipi6_addr = srcsock.sin6_addr; /* XXX: this overrides pi */
262a1f7e5f8SHajimu UMEMOTO 		if (ifpp)
263a1f7e5f8SHajimu UMEMOTO 			*ifpp = ifp;
26488d166bfSBjoern A. Zeeb 		bcopy(&ia6->ia_addr.sin6_addr, srcp, sizeof(*srcp));
2658c0fec80SRobert Watson 		ifa_free(&ia6->ia_ifa);
26688d166bfSBjoern A. Zeeb 		return (0);
267d6385b1cSHajimu UMEMOTO 	}
268d6385b1cSHajimu UMEMOTO 
269d6385b1cSHajimu UMEMOTO 	/*
270d6385b1cSHajimu UMEMOTO 	 * Otherwise, if the socket has already bound the source, just use it.
271686cdd19SJun-ichiro itojun Hagino 	 */
272f2f877d3SBjoern A. Zeeb 	if (inp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
273b89e82ddSJamie Gritton 		if (cred != NULL &&
27488d166bfSBjoern A. Zeeb 		    (error = prison_local_ip6(cred, &inp->in6p_laddr,
275b89e82ddSJamie Gritton 		    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0))) != 0)
27688d166bfSBjoern A. Zeeb 			return (error);
27788d166bfSBjoern A. Zeeb 		bcopy(&inp->in6p_laddr, srcp, sizeof(*srcp));
27888d166bfSBjoern A. Zeeb 		return (0);
279f2f877d3SBjoern A. Zeeb 	}
280686cdd19SJun-ichiro itojun Hagino 
281686cdd19SJun-ichiro itojun Hagino 	/*
282592bcae8SBjoern A. Zeeb 	 * Bypass source address selection and use the primary jail IP
283592bcae8SBjoern A. Zeeb 	 * if requested.
284592bcae8SBjoern A. Zeeb 	 */
285592bcae8SBjoern A. Zeeb 	if (cred != NULL && !prison_saddrsel_ip6(cred, srcp))
286592bcae8SBjoern A. Zeeb 		return (0);
287592bcae8SBjoern A. Zeeb 
288592bcae8SBjoern A. Zeeb 	/*
289d6385b1cSHajimu UMEMOTO 	 * If the address is not specified, choose the best one based on
290d6385b1cSHajimu UMEMOTO 	 * the outgoing interface and the destination address.
291686cdd19SJun-ichiro itojun Hagino 	 */
292d6385b1cSHajimu UMEMOTO 	/* get the outgoing interface */
2931b46c7f8SBjoern A. Zeeb 	if ((error = in6_selectif(dstsock, opts, mopts, ro, &ifp, oifp,
29481d5d46bSBjoern A. Zeeb 	    (inp != NULL) ? inp->inp_inc.inc_fibnum : RT_DEFAULT_FIB)) != 0)
29588d166bfSBjoern A. Zeeb 		return (error);
296686cdd19SJun-ichiro itojun Hagino 
297d6385b1cSHajimu UMEMOTO #ifdef DIAGNOSTIC
298d6385b1cSHajimu UMEMOTO 	if (ifp == NULL)	/* this should not happen */
299d6385b1cSHajimu UMEMOTO 		panic("in6_selectsrc: NULL ifp");
300d6385b1cSHajimu UMEMOTO #endif
30188d166bfSBjoern A. Zeeb 	error = in6_setscope(&dst, ifp, &odstzone);
30288d166bfSBjoern A. Zeeb 	if (error)
30388d166bfSBjoern A. Zeeb 		return (error);
304a1f7e5f8SHajimu UMEMOTO 
305e7a87117SAndrey V. Elsukov 	rule = 0;
306d1da0a06SRobert Watson 	IN6_IFADDR_RLOCK();
30780af0152SRobert Watson 	TAILQ_FOREACH(ia, &V_in6_ifaddrhead, ia_link) {
308d6385b1cSHajimu UMEMOTO 		int new_scope = -1, new_matchlen = -1;
309d6385b1cSHajimu UMEMOTO 		struct in6_addrpolicy *new_policy = NULL;
310d6385b1cSHajimu UMEMOTO 		u_int32_t srczone, osrczone, dstzone;
311a1f7e5f8SHajimu UMEMOTO 		struct in6_addr src;
312d6385b1cSHajimu UMEMOTO 		struct ifnet *ifp1 = ia->ia_ifp;
313d6385b1cSHajimu UMEMOTO 
314d6385b1cSHajimu UMEMOTO 		/*
315d6385b1cSHajimu UMEMOTO 		 * We'll never take an address that breaks the scope zone
316d6385b1cSHajimu UMEMOTO 		 * of the destination.  We also skip an address if its zone
317d6385b1cSHajimu UMEMOTO 		 * does not contain the outgoing interface.
318d6385b1cSHajimu UMEMOTO 		 * XXX: we should probably use sin6_scope_id here.
319d6385b1cSHajimu UMEMOTO 		 */
320a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&dst, ifp1, &dstzone) ||
321d6385b1cSHajimu UMEMOTO 		    odstzone != dstzone) {
322d6385b1cSHajimu UMEMOTO 			continue;
323d6385b1cSHajimu UMEMOTO 		}
324a1f7e5f8SHajimu UMEMOTO 		src = ia->ia_addr.sin6_addr;
325a1f7e5f8SHajimu UMEMOTO 		if (in6_setscope(&src, ifp, &osrczone) ||
326a1f7e5f8SHajimu UMEMOTO 		    in6_setscope(&src, ifp1, &srczone) ||
327d6385b1cSHajimu UMEMOTO 		    osrczone != srczone) {
328d6385b1cSHajimu UMEMOTO 			continue;
329686cdd19SJun-ichiro itojun Hagino 		}
330686cdd19SJun-ichiro itojun Hagino 
331d6385b1cSHajimu UMEMOTO 		/* avoid unusable addresses */
332d6385b1cSHajimu UMEMOTO 		if ((ia->ia6_flags &
333d6385b1cSHajimu UMEMOTO 		     (IN6_IFF_NOTREADY | IN6_IFF_ANYCAST | IN6_IFF_DETACHED))) {
334d6385b1cSHajimu UMEMOTO 				continue;
335d6385b1cSHajimu UMEMOTO 		}
336603724d3SBjoern A. Zeeb 		if (!V_ip6_use_deprecated && IFA6_IS_DEPRECATED(ia))
337d6385b1cSHajimu UMEMOTO 			continue;
338d6385b1cSHajimu UMEMOTO 
339877fc3b6SBjoern A. Zeeb 		/* If jailed only take addresses of the jail into account. */
340413628a7SBjoern A. Zeeb 		if (cred != NULL &&
341877fc3b6SBjoern A. Zeeb 		    prison_check_ip6(cred, &ia->ia_addr.sin6_addr) != 0)
342413628a7SBjoern A. Zeeb 			continue;
343413628a7SBjoern A. Zeeb 
344d6385b1cSHajimu UMEMOTO 		/* Rule 1: Prefer same address */
345a1f7e5f8SHajimu UMEMOTO 		if (IN6_ARE_ADDR_EQUAL(&dst, &ia->ia_addr.sin6_addr)) {
346d6385b1cSHajimu UMEMOTO 			ia_best = ia;
347d6385b1cSHajimu UMEMOTO 			BREAK(1); /* there should be no better candidate */
348d6385b1cSHajimu UMEMOTO 		}
349d6385b1cSHajimu UMEMOTO 
350d6385b1cSHajimu UMEMOTO 		if (ia_best == NULL)
351d6385b1cSHajimu UMEMOTO 			REPLACE(0);
352d6385b1cSHajimu UMEMOTO 
353d6385b1cSHajimu UMEMOTO 		/* Rule 2: Prefer appropriate scope */
354d6385b1cSHajimu UMEMOTO 		if (dst_scope < 0)
355a1f7e5f8SHajimu UMEMOTO 			dst_scope = in6_addrscope(&dst);
356d6385b1cSHajimu UMEMOTO 		new_scope = in6_addrscope(&ia->ia_addr.sin6_addr);
357d6385b1cSHajimu UMEMOTO 		if (IN6_ARE_SCOPE_CMP(best_scope, new_scope) < 0) {
358d6385b1cSHajimu UMEMOTO 			if (IN6_ARE_SCOPE_CMP(best_scope, dst_scope) < 0)
359d6385b1cSHajimu UMEMOTO 				REPLACE(2);
360d6385b1cSHajimu UMEMOTO 			NEXT(2);
361d6385b1cSHajimu UMEMOTO 		} else if (IN6_ARE_SCOPE_CMP(new_scope, best_scope) < 0) {
362d6385b1cSHajimu UMEMOTO 			if (IN6_ARE_SCOPE_CMP(new_scope, dst_scope) < 0)
363d6385b1cSHajimu UMEMOTO 				NEXT(2);
364d6385b1cSHajimu UMEMOTO 			REPLACE(2);
365d6385b1cSHajimu UMEMOTO 		}
366d6385b1cSHajimu UMEMOTO 
367d6385b1cSHajimu UMEMOTO 		/*
368d6385b1cSHajimu UMEMOTO 		 * Rule 3: Avoid deprecated addresses.  Note that the case of
369d6385b1cSHajimu UMEMOTO 		 * !ip6_use_deprecated is already rejected above.
370d6385b1cSHajimu UMEMOTO 		 */
371d6385b1cSHajimu UMEMOTO 		if (!IFA6_IS_DEPRECATED(ia_best) && IFA6_IS_DEPRECATED(ia))
372d6385b1cSHajimu UMEMOTO 			NEXT(3);
373d6385b1cSHajimu UMEMOTO 		if (IFA6_IS_DEPRECATED(ia_best) && !IFA6_IS_DEPRECATED(ia))
374d6385b1cSHajimu UMEMOTO 			REPLACE(3);
375d6385b1cSHajimu UMEMOTO 
376d6385b1cSHajimu UMEMOTO 		/* Rule 4: Prefer home addresses */
377d6385b1cSHajimu UMEMOTO 		/*
378d6385b1cSHajimu UMEMOTO 		 * XXX: This is a TODO.  We should probably merge the MIP6
379d6385b1cSHajimu UMEMOTO 		 * case above.
380d6385b1cSHajimu UMEMOTO 		 */
381d6385b1cSHajimu UMEMOTO 
382d6385b1cSHajimu UMEMOTO 		/* Rule 5: Prefer outgoing interface */
383164051ceSHajimu UMEMOTO 		if (!(ND_IFINFO(ifp)->flags & ND6_IFF_NO_PREFER_IFACE)) {
384d6385b1cSHajimu UMEMOTO 			if (ia_best->ia_ifp == ifp && ia->ia_ifp != ifp)
385d6385b1cSHajimu UMEMOTO 				NEXT(5);
386d6385b1cSHajimu UMEMOTO 			if (ia_best->ia_ifp != ifp && ia->ia_ifp == ifp)
387d6385b1cSHajimu UMEMOTO 				REPLACE(5);
388164051ceSHajimu UMEMOTO 		}
389d6385b1cSHajimu UMEMOTO 
390d6385b1cSHajimu UMEMOTO 		/*
391d6385b1cSHajimu UMEMOTO 		 * Rule 6: Prefer matching label
392d6385b1cSHajimu UMEMOTO 		 * Note that best_policy should be non-NULL here.
393d6385b1cSHajimu UMEMOTO 		 */
394d6385b1cSHajimu UMEMOTO 		if (dst_policy == NULL)
395d6385b1cSHajimu UMEMOTO 			dst_policy = lookup_addrsel_policy(dstsock);
396d6385b1cSHajimu UMEMOTO 		if (dst_policy->label != ADDR_LABEL_NOTAPP) {
397d6385b1cSHajimu UMEMOTO 			new_policy = lookup_addrsel_policy(&ia->ia_addr);
398d6385b1cSHajimu UMEMOTO 			if (dst_policy->label == best_policy->label &&
399d6385b1cSHajimu UMEMOTO 			    dst_policy->label != new_policy->label)
400d6385b1cSHajimu UMEMOTO 				NEXT(6);
401d6385b1cSHajimu UMEMOTO 			if (dst_policy->label != best_policy->label &&
402d6385b1cSHajimu UMEMOTO 			    dst_policy->label == new_policy->label)
403d6385b1cSHajimu UMEMOTO 				REPLACE(6);
404d6385b1cSHajimu UMEMOTO 		}
405d6385b1cSHajimu UMEMOTO 
406d6385b1cSHajimu UMEMOTO 		/*
407d6385b1cSHajimu UMEMOTO 		 * Rule 7: Prefer public addresses.
408d6385b1cSHajimu UMEMOTO 		 * We allow users to reverse the logic by configuring
409d6385b1cSHajimu UMEMOTO 		 * a sysctl variable, so that privacy conscious users can
410d6385b1cSHajimu UMEMOTO 		 * always prefer temporary addresses.
411d6385b1cSHajimu UMEMOTO 		 */
412d6385b1cSHajimu UMEMOTO 		if (opts == NULL ||
413d6385b1cSHajimu UMEMOTO 		    opts->ip6po_prefer_tempaddr == IP6PO_TEMPADDR_SYSTEM) {
414603724d3SBjoern A. Zeeb 			prefer_tempaddr = V_ip6_prefer_tempaddr;
415d6385b1cSHajimu UMEMOTO 		} else if (opts->ip6po_prefer_tempaddr ==
416d6385b1cSHajimu UMEMOTO 		    IP6PO_TEMPADDR_NOTPREFER) {
417d6385b1cSHajimu UMEMOTO 			prefer_tempaddr = 0;
418d6385b1cSHajimu UMEMOTO 		} else
419d6385b1cSHajimu UMEMOTO 			prefer_tempaddr = 1;
420d6385b1cSHajimu UMEMOTO 		if (!(ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
421d6385b1cSHajimu UMEMOTO 		    (ia->ia6_flags & IN6_IFF_TEMPORARY)) {
422d6385b1cSHajimu UMEMOTO 			if (prefer_tempaddr)
423d6385b1cSHajimu UMEMOTO 				REPLACE(7);
424d6385b1cSHajimu UMEMOTO 			else
425d6385b1cSHajimu UMEMOTO 				NEXT(7);
426d6385b1cSHajimu UMEMOTO 		}
427d6385b1cSHajimu UMEMOTO 		if ((ia_best->ia6_flags & IN6_IFF_TEMPORARY) &&
428d6385b1cSHajimu UMEMOTO 		    !(ia->ia6_flags & IN6_IFF_TEMPORARY)) {
429d6385b1cSHajimu UMEMOTO 			if (prefer_tempaddr)
430d6385b1cSHajimu UMEMOTO 				NEXT(7);
431d6385b1cSHajimu UMEMOTO 			else
432d6385b1cSHajimu UMEMOTO 				REPLACE(7);
433d6385b1cSHajimu UMEMOTO 		}
434d6385b1cSHajimu UMEMOTO 
435d6385b1cSHajimu UMEMOTO 		/*
436d6385b1cSHajimu UMEMOTO 		 * Rule 8: prefer addresses on alive interfaces.
437d6385b1cSHajimu UMEMOTO 		 * This is a KAME specific rule.
438d6385b1cSHajimu UMEMOTO 		 */
439d6385b1cSHajimu UMEMOTO 		if ((ia_best->ia_ifp->if_flags & IFF_UP) &&
440d6385b1cSHajimu UMEMOTO 		    !(ia->ia_ifp->if_flags & IFF_UP))
441d6385b1cSHajimu UMEMOTO 			NEXT(8);
442d6385b1cSHajimu UMEMOTO 		if (!(ia_best->ia_ifp->if_flags & IFF_UP) &&
443d6385b1cSHajimu UMEMOTO 		    (ia->ia_ifp->if_flags & IFF_UP))
444d6385b1cSHajimu UMEMOTO 			REPLACE(8);
445d6385b1cSHajimu UMEMOTO 
446d6385b1cSHajimu UMEMOTO 		/*
447*d6e6b994SAndrey V. Elsukov 		 * Rule 9: prefer address with better virtual status.
448*d6e6b994SAndrey V. Elsukov 		 */
449*d6e6b994SAndrey V. Elsukov 		if (ifa_preferred(&ia_best->ia_ifa, &ia->ia_ifa))
450*d6e6b994SAndrey V. Elsukov 			REPLACE(9);
451*d6e6b994SAndrey V. Elsukov 
452*d6e6b994SAndrey V. Elsukov 		/*
453d6385b1cSHajimu UMEMOTO 		 * Rule 14: Use longest matching prefix.
454d6385b1cSHajimu UMEMOTO 		 * Note: in the address selection draft, this rule is
455d6385b1cSHajimu UMEMOTO 		 * documented as "Rule 8".  However, since it is also
456d6385b1cSHajimu UMEMOTO 		 * documented that this rule can be overridden, we assign
457d6385b1cSHajimu UMEMOTO 		 * a large number so that it is easy to assign smaller numbers
458d6385b1cSHajimu UMEMOTO 		 * to more preferred rules.
459d6385b1cSHajimu UMEMOTO 		 */
460a1f7e5f8SHajimu UMEMOTO 		new_matchlen = in6_matchlen(&ia->ia_addr.sin6_addr, &dst);
461d6385b1cSHajimu UMEMOTO 		if (best_matchlen < new_matchlen)
462d6385b1cSHajimu UMEMOTO 			REPLACE(14);
463d6385b1cSHajimu UMEMOTO 		if (new_matchlen < best_matchlen)
464d6385b1cSHajimu UMEMOTO 			NEXT(14);
465d6385b1cSHajimu UMEMOTO 
466d6385b1cSHajimu UMEMOTO 		/* Rule 15 is reserved. */
467d6385b1cSHajimu UMEMOTO 
468d6385b1cSHajimu UMEMOTO 		/*
469d6385b1cSHajimu UMEMOTO 		 * Last resort: just keep the current candidate.
470d6385b1cSHajimu UMEMOTO 		 * Or, do we need more rules?
471d6385b1cSHajimu UMEMOTO 		 */
472d6385b1cSHajimu UMEMOTO 		continue;
473d6385b1cSHajimu UMEMOTO 
474d6385b1cSHajimu UMEMOTO 	  replace:
475d6385b1cSHajimu UMEMOTO 		ia_best = ia;
476d6385b1cSHajimu UMEMOTO 		best_scope = (new_scope >= 0 ? new_scope :
477d6385b1cSHajimu UMEMOTO 			      in6_addrscope(&ia_best->ia_addr.sin6_addr));
478d6385b1cSHajimu UMEMOTO 		best_policy = (new_policy ? new_policy :
479d6385b1cSHajimu UMEMOTO 			       lookup_addrsel_policy(&ia_best->ia_addr));
480d6385b1cSHajimu UMEMOTO 		best_matchlen = (new_matchlen >= 0 ? new_matchlen :
481d6385b1cSHajimu UMEMOTO 				 in6_matchlen(&ia_best->ia_addr.sin6_addr,
482a1f7e5f8SHajimu UMEMOTO 					      &dst));
483d6385b1cSHajimu UMEMOTO 
484d6385b1cSHajimu UMEMOTO 	  next:
485d6385b1cSHajimu UMEMOTO 		continue;
486d6385b1cSHajimu UMEMOTO 
487d6385b1cSHajimu UMEMOTO 	  out:
488d6385b1cSHajimu UMEMOTO 		break;
489d6385b1cSHajimu UMEMOTO 	}
490d6385b1cSHajimu UMEMOTO 
491d1da0a06SRobert Watson 	if ((ia = ia_best) == NULL) {
492d1da0a06SRobert Watson 		IN6_IFADDR_RUNLOCK();
493e7a87117SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_none);
49488d166bfSBjoern A. Zeeb 		return (EADDRNOTAVAIL);
495d1da0a06SRobert Watson 	}
496686cdd19SJun-ichiro itojun Hagino 
497877fc3b6SBjoern A. Zeeb 	/*
498877fc3b6SBjoern A. Zeeb 	 * At this point at least one of the addresses belonged to the jail
499877fc3b6SBjoern A. Zeeb 	 * but it could still be, that we want to further restrict it, e.g.
500877fc3b6SBjoern A. Zeeb 	 * theoratically IN6_IS_ADDR_LOOPBACK.
501877fc3b6SBjoern A. Zeeb 	 * It must not be IN6_IS_ADDR_UNSPECIFIED anymore.
502877fc3b6SBjoern A. Zeeb 	 * prison_local_ip6() will fix an IN6_IS_ADDR_LOOPBACK but should
503877fc3b6SBjoern A. Zeeb 	 * let all others previously selected pass.
504877fc3b6SBjoern A. Zeeb 	 * Use tmp to not change ::1 on lo0 to the primary jail address.
505877fc3b6SBjoern A. Zeeb 	 */
506877fc3b6SBjoern A. Zeeb 	tmp = ia->ia_addr.sin6_addr;
507877fc3b6SBjoern A. Zeeb 	if (cred != NULL && prison_local_ip6(cred, &tmp, (inp != NULL &&
508877fc3b6SBjoern A. Zeeb 	    (inp->inp_flags & IN6P_IPV6_V6ONLY) != 0)) != 0) {
509877fc3b6SBjoern A. Zeeb 		IN6_IFADDR_RUNLOCK();
510e7a87117SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_none);
511877fc3b6SBjoern A. Zeeb 		return (EADDRNOTAVAIL);
512877fc3b6SBjoern A. Zeeb 	}
513877fc3b6SBjoern A. Zeeb 
514a1f7e5f8SHajimu UMEMOTO 	if (ifpp)
515a1f7e5f8SHajimu UMEMOTO 		*ifpp = ifp;
516a1f7e5f8SHajimu UMEMOTO 
517877fc3b6SBjoern A. Zeeb 	bcopy(&tmp, srcp, sizeof(*srcp));
5184ff7c740SAndrey V. Elsukov 	if (ia->ia_ifp == ifp)
5194ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_sameif[best_scope]);
5204ff7c740SAndrey V. Elsukov 	else
5214ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_otherif[best_scope]);
5224ff7c740SAndrey V. Elsukov 	if (dst_scope == best_scope)
5234ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_samescope[best_scope]);
5244ff7c740SAndrey V. Elsukov 	else
5254ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_otherscope[best_scope]);
5264ff7c740SAndrey V. Elsukov 	if (IFA6_IS_DEPRECATED(ia))
5274ff7c740SAndrey V. Elsukov 		IP6STAT_INC(ip6s_sources_deprecated[best_scope]);
528d1da0a06SRobert Watson 	IN6_IFADDR_RUNLOCK();
52988d166bfSBjoern A. Zeeb 	return (0);
530d6385b1cSHajimu UMEMOTO }
531d6385b1cSHajimu UMEMOTO 
5321272577eSXin LI /*
5331272577eSXin LI  * clone - meaningful only for bsdi and freebsd
5341272577eSXin LI  */
535d6385b1cSHajimu UMEMOTO static int
5361272577eSXin LI selectroute(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
5371272577eSXin LI     struct ip6_moptions *mopts, struct route_in6 *ro,
5385aa7e8edSBjoern A. Zeeb     struct ifnet **retifp, struct rtentry **retrt, int norouteok, u_int fibnum)
539d6385b1cSHajimu UMEMOTO {
540d6385b1cSHajimu UMEMOTO 	int error = 0;
541d6385b1cSHajimu UMEMOTO 	struct ifnet *ifp = NULL;
542d6385b1cSHajimu UMEMOTO 	struct rtentry *rt = NULL;
543d6385b1cSHajimu UMEMOTO 	struct sockaddr_in6 *sin6_next;
544d6385b1cSHajimu UMEMOTO 	struct in6_pktinfo *pi = NULL;
545d6385b1cSHajimu UMEMOTO 	struct in6_addr *dst = &dstsock->sin6_addr;
546d6385b1cSHajimu UMEMOTO #if 0
5471d54aa3bSBjoern A. Zeeb 	char ip6buf[INET6_ADDRSTRLEN];
5481d54aa3bSBjoern A. Zeeb 
549d6385b1cSHajimu UMEMOTO 	if (dstsock->sin6_addr.s6_addr32[0] == 0 &&
550d6385b1cSHajimu UMEMOTO 	    dstsock->sin6_addr.s6_addr32[1] == 0 &&
551d6385b1cSHajimu UMEMOTO 	    !IN6_IS_ADDR_LOOPBACK(&dstsock->sin6_addr)) {
552d6385b1cSHajimu UMEMOTO 		printf("in6_selectroute: strange destination %s\n",
5531d54aa3bSBjoern A. Zeeb 		       ip6_sprintf(ip6buf, &dstsock->sin6_addr));
554d6385b1cSHajimu UMEMOTO 	} else {
555d6385b1cSHajimu UMEMOTO 		printf("in6_selectroute: destination = %s%%%d\n",
5561d54aa3bSBjoern A. Zeeb 		       ip6_sprintf(ip6buf, &dstsock->sin6_addr),
557d6385b1cSHajimu UMEMOTO 		       dstsock->sin6_scope_id); /* for debug */
558d6385b1cSHajimu UMEMOTO 	}
559d6385b1cSHajimu UMEMOTO #endif
560d6385b1cSHajimu UMEMOTO 
561d6385b1cSHajimu UMEMOTO 	/* If the caller specify the outgoing interface explicitly, use it. */
562d6385b1cSHajimu UMEMOTO 	if (opts && (pi = opts->ip6po_pktinfo) != NULL && pi->ipi6_ifindex) {
563d6385b1cSHajimu UMEMOTO 		/* XXX boundary check is assumed to be already done. */
564d6385b1cSHajimu UMEMOTO 		ifp = ifnet_byindex(pi->ipi6_ifindex);
565d6385b1cSHajimu UMEMOTO 		if (ifp != NULL &&
566a1f7e5f8SHajimu UMEMOTO 		    (norouteok || retrt == NULL ||
567a1f7e5f8SHajimu UMEMOTO 		    IN6_IS_ADDR_MULTICAST(dst))) {
568d6385b1cSHajimu UMEMOTO 			/*
569cd0fdcf7SHajimu UMEMOTO 			 * we do not have to check or get the route for
570d6385b1cSHajimu UMEMOTO 			 * multicast.
571d6385b1cSHajimu UMEMOTO 			 */
572d6385b1cSHajimu UMEMOTO 			goto done;
573d6385b1cSHajimu UMEMOTO 		} else
574d6385b1cSHajimu UMEMOTO 			goto getroute;
575d6385b1cSHajimu UMEMOTO 	}
576d6385b1cSHajimu UMEMOTO 
577d6385b1cSHajimu UMEMOTO 	/*
578d6385b1cSHajimu UMEMOTO 	 * If the destination address is a multicast address and the outgoing
579d6385b1cSHajimu UMEMOTO 	 * interface for the address is specified by the caller, use it.
580d6385b1cSHajimu UMEMOTO 	 */
581d6385b1cSHajimu UMEMOTO 	if (IN6_IS_ADDR_MULTICAST(dst) &&
582d6385b1cSHajimu UMEMOTO 	    mopts != NULL && (ifp = mopts->im6o_multicast_ifp) != NULL) {
583d6385b1cSHajimu UMEMOTO 		goto done; /* we do not need a route for multicast. */
584d6385b1cSHajimu UMEMOTO 	}
585d6385b1cSHajimu UMEMOTO 
586d6385b1cSHajimu UMEMOTO   getroute:
587d6385b1cSHajimu UMEMOTO 	/*
588d6385b1cSHajimu UMEMOTO 	 * If the next hop address for the packet is specified by the caller,
589d6385b1cSHajimu UMEMOTO 	 * use it as the gateway.
590d6385b1cSHajimu UMEMOTO 	 */
591d6385b1cSHajimu UMEMOTO 	if (opts && opts->ip6po_nexthop) {
592d6385b1cSHajimu UMEMOTO 		struct route_in6 *ron;
5936e6b3f7cSQing Li 		struct llentry *la;
594d6385b1cSHajimu UMEMOTO 
595d6385b1cSHajimu UMEMOTO 		sin6_next = satosin6(opts->ip6po_nexthop);
596d6385b1cSHajimu UMEMOTO 
597d6385b1cSHajimu UMEMOTO 		/* at this moment, we only support AF_INET6 next hops */
598d6385b1cSHajimu UMEMOTO 		if (sin6_next->sin6_family != AF_INET6) {
599d6385b1cSHajimu UMEMOTO 			error = EAFNOSUPPORT; /* or should we proceed? */
600d6385b1cSHajimu UMEMOTO 			goto done;
601d6385b1cSHajimu UMEMOTO 		}
602d6385b1cSHajimu UMEMOTO 
603d6385b1cSHajimu UMEMOTO 		/*
604d6385b1cSHajimu UMEMOTO 		 * If the next hop is an IPv6 address, then the node identified
605d6385b1cSHajimu UMEMOTO 		 * by that address must be a neighbor of the sending host.
606d6385b1cSHajimu UMEMOTO 		 */
607d6385b1cSHajimu UMEMOTO 		ron = &opts->ip6po_nextroute;
6086e6b3f7cSQing Li 		/*
6096e6b3f7cSQing Li 		 * XXX what do we do here?
6106e6b3f7cSQing Li 		 * PLZ to be fixing
6116e6b3f7cSQing Li 		 */
6126e6b3f7cSQing Li 
6136e6b3f7cSQing Li 
6146e6b3f7cSQing Li 		if (ron->ro_rt == NULL) {
61581d5d46bSBjoern A. Zeeb 			in6_rtalloc(ron, fibnum); /* multi path case? */
6166e6b3f7cSQing Li 			if (ron->ro_rt == NULL) {
61723bc7025SBjoern A. Zeeb 				/* XXX-BZ WT.? */
6186e6b3f7cSQing Li 				if (ron->ro_rt) {
6196e6b3f7cSQing Li 					RTFREE(ron->ro_rt);
6206e6b3f7cSQing Li 					ron->ro_rt = NULL;
6216e6b3f7cSQing Li 				}
6226e6b3f7cSQing Li 				error = EHOSTUNREACH;
6236e6b3f7cSQing Li 				goto done;
6246e6b3f7cSQing Li 			}
6256e6b3f7cSQing Li 		}
6266e6b3f7cSQing Li 
6276e6b3f7cSQing Li 		rt = ron->ro_rt;
6286e6b3f7cSQing Li 		ifp = rt->rt_ifp;
62973cb2f38SAndrey V. Elsukov 		IF_AFDATA_RLOCK(ifp);
630b88aef1dSAndrey V. Elsukov 		la = lla_lookup(LLTABLE6(ifp), 0, (struct sockaddr *)sin6_next);
63173cb2f38SAndrey V. Elsukov 		IF_AFDATA_RUNLOCK(ifp);
632688d079bSKip Macy 		if (la != NULL)
6336e6b3f7cSQing Li 			LLE_RUNLOCK(la);
6346e6b3f7cSQing Li 		else {
6356e6b3f7cSQing Li 			error = EHOSTUNREACH;
6366e6b3f7cSQing Li 			goto done;
6376e6b3f7cSQing Li 		}
6386e6b3f7cSQing Li #if 0
639d6385b1cSHajimu UMEMOTO 		if ((ron->ro_rt &&
640d6385b1cSHajimu UMEMOTO 		     (ron->ro_rt->rt_flags & (RTF_UP | RTF_LLINFO)) !=
641d6385b1cSHajimu UMEMOTO 		     (RTF_UP | RTF_LLINFO)) ||
642c1a049acSSUZUKI Shinsuke 		    !IN6_ARE_ADDR_EQUAL(&satosin6(&ron->ro_dst)->sin6_addr,
643c1a049acSSUZUKI Shinsuke 		    &sin6_next->sin6_addr)) {
644d6385b1cSHajimu UMEMOTO 			if (ron->ro_rt) {
645d6385b1cSHajimu UMEMOTO 				RTFREE(ron->ro_rt);
646d6385b1cSHajimu UMEMOTO 				ron->ro_rt = NULL;
647d6385b1cSHajimu UMEMOTO 			}
648d6385b1cSHajimu UMEMOTO 			*satosin6(&ron->ro_dst) = *sin6_next;
649d6385b1cSHajimu UMEMOTO 		}
650d6385b1cSHajimu UMEMOTO 		if (ron->ro_rt == NULL) {
6515aa7e8edSBjoern A. Zeeb 			in6_rtalloc(ron, fibnum); /* multi path case? */
652d6385b1cSHajimu UMEMOTO 			if (ron->ro_rt == NULL ||
653d6385b1cSHajimu UMEMOTO 			    !(ron->ro_rt->rt_flags & RTF_LLINFO)) {
654d6385b1cSHajimu UMEMOTO 				if (ron->ro_rt) {
655d6385b1cSHajimu UMEMOTO 					RTFREE(ron->ro_rt);
656d6385b1cSHajimu UMEMOTO 					ron->ro_rt = NULL;
657d6385b1cSHajimu UMEMOTO 				}
658d6385b1cSHajimu UMEMOTO 				error = EHOSTUNREACH;
659d6385b1cSHajimu UMEMOTO 				goto done;
660d6385b1cSHajimu UMEMOTO 			}
661d6385b1cSHajimu UMEMOTO 		}
6626e6b3f7cSQing Li #endif
663d6385b1cSHajimu UMEMOTO 
664d6385b1cSHajimu UMEMOTO 		/*
665d6385b1cSHajimu UMEMOTO 		 * When cloning is required, try to allocate a route to the
666d6385b1cSHajimu UMEMOTO 		 * destination so that the caller can store path MTU
667d6385b1cSHajimu UMEMOTO 		 * information.
668d6385b1cSHajimu UMEMOTO 		 */
669d6385b1cSHajimu UMEMOTO 		goto done;
670d6385b1cSHajimu UMEMOTO 	}
671d6385b1cSHajimu UMEMOTO 
672d6385b1cSHajimu UMEMOTO 	/*
673d6385b1cSHajimu UMEMOTO 	 * Use a cached route if it exists and is valid, else try to allocate
674d6385b1cSHajimu UMEMOTO 	 * a new one.  Note that we should check the address family of the
675d6385b1cSHajimu UMEMOTO 	 * cached destination, in case of sharing the cache with IPv4.
676686cdd19SJun-ichiro itojun Hagino 	 */
677686cdd19SJun-ichiro itojun Hagino 	if (ro) {
678686cdd19SJun-ichiro itojun Hagino 		if (ro->ro_rt &&
67954c1b882SHajimu UMEMOTO 		    (!(ro->ro_rt->rt_flags & RTF_UP) ||
680d6385b1cSHajimu UMEMOTO 		     ((struct sockaddr *)(&ro->ro_dst))->sa_family != AF_INET6 ||
68154c1b882SHajimu UMEMOTO 		     !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr,
68254c1b882SHajimu UMEMOTO 		     dst))) {
683686cdd19SJun-ichiro itojun Hagino 			RTFREE(ro->ro_rt);
684d6385b1cSHajimu UMEMOTO 			ro->ro_rt = (struct rtentry *)NULL;
685686cdd19SJun-ichiro itojun Hagino 		}
686d6385b1cSHajimu UMEMOTO 		if (ro->ro_rt == (struct rtentry *)NULL) {
68733841545SHajimu UMEMOTO 			struct sockaddr_in6 *sa6;
68833841545SHajimu UMEMOTO 
689686cdd19SJun-ichiro itojun Hagino 			/* No route yet, so try to acquire one */
690686cdd19SJun-ichiro itojun Hagino 			bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
69133841545SHajimu UMEMOTO 			sa6 = (struct sockaddr_in6 *)&ro->ro_dst;
692d6385b1cSHajimu UMEMOTO 			*sa6 = *dstsock;
693e6a27350SHajimu UMEMOTO 			sa6->sin6_scope_id = 0;
69497d8d152SAndre Oppermann 
695e440aed9SQing Li #ifdef RADIX_MPATH
69681d5d46bSBjoern A. Zeeb 				rtalloc_mpath_fib((struct route *)ro,
69781d5d46bSBjoern A. Zeeb 				    ntohl(sa6->sin6_addr.s6_addr32[3]), fibnum);
698e440aed9SQing Li #else
69981d5d46bSBjoern A. Zeeb 				ro->ro_rt = in6_rtalloc1((struct sockaddr *)
70081d5d46bSBjoern A. Zeeb 				    &ro->ro_dst, 0, 0UL, fibnum);
70137bdc280SSam Leffler 				if (ro->ro_rt)
702d1dd20beSSam Leffler 					RT_UNLOCK(ro->ro_rt);
7036e6b3f7cSQing Li #endif
704686cdd19SJun-ichiro itojun Hagino 		}
705686cdd19SJun-ichiro itojun Hagino 
706686cdd19SJun-ichiro itojun Hagino 		/*
707d6385b1cSHajimu UMEMOTO 		 * do not care about the result if we have the nexthop
708d6385b1cSHajimu UMEMOTO 		 * explicitly specified.
709686cdd19SJun-ichiro itojun Hagino 		 */
710d6385b1cSHajimu UMEMOTO 		if (opts && opts->ip6po_nexthop)
711d6385b1cSHajimu UMEMOTO 			goto done;
712686cdd19SJun-ichiro itojun Hagino 
713686cdd19SJun-ichiro itojun Hagino 		if (ro->ro_rt) {
714d6385b1cSHajimu UMEMOTO 			ifp = ro->ro_rt->rt_ifp;
715d6385b1cSHajimu UMEMOTO 
716d6385b1cSHajimu UMEMOTO 			if (ifp == NULL) { /* can this really happen? */
717d6385b1cSHajimu UMEMOTO 				RTFREE(ro->ro_rt);
718d6385b1cSHajimu UMEMOTO 				ro->ro_rt = NULL;
719686cdd19SJun-ichiro itojun Hagino 			}
720686cdd19SJun-ichiro itojun Hagino 		}
721d6385b1cSHajimu UMEMOTO 		if (ro->ro_rt == NULL)
722d6385b1cSHajimu UMEMOTO 			error = EHOSTUNREACH;
723d6385b1cSHajimu UMEMOTO 		rt = ro->ro_rt;
724d6385b1cSHajimu UMEMOTO 
725d6385b1cSHajimu UMEMOTO 		/*
726d6385b1cSHajimu UMEMOTO 		 * Check if the outgoing interface conflicts with
727d6385b1cSHajimu UMEMOTO 		 * the interface specified by ipi6_ifindex (if specified).
728d6385b1cSHajimu UMEMOTO 		 * Note that loopback interface is always okay.
729d6385b1cSHajimu UMEMOTO 		 * (this may happen when we are sending a packet to one of
730d6385b1cSHajimu UMEMOTO 		 *  our own addresses.)
731d6385b1cSHajimu UMEMOTO 		 */
732403cbcf5SGeorge V. Neville-Neil 		if (ifp && opts && opts->ip6po_pktinfo &&
73368efda09SHajimu UMEMOTO 		    opts->ip6po_pktinfo->ipi6_ifindex) {
734d6385b1cSHajimu UMEMOTO 			if (!(ifp->if_flags & IFF_LOOPBACK) &&
735d6385b1cSHajimu UMEMOTO 			    ifp->if_index !=
736d6385b1cSHajimu UMEMOTO 			    opts->ip6po_pktinfo->ipi6_ifindex) {
737d6385b1cSHajimu UMEMOTO 				error = EHOSTUNREACH;
738d6385b1cSHajimu UMEMOTO 				goto done;
739d6385b1cSHajimu UMEMOTO 			}
740d6385b1cSHajimu UMEMOTO 		}
741686cdd19SJun-ichiro itojun Hagino 	}
742686cdd19SJun-ichiro itojun Hagino 
743d6385b1cSHajimu UMEMOTO   done:
744d6385b1cSHajimu UMEMOTO 	if (ifp == NULL && rt == NULL) {
745d6385b1cSHajimu UMEMOTO 		/*
746d6385b1cSHajimu UMEMOTO 		 * This can happen if the caller did not pass a cached route
747d6385b1cSHajimu UMEMOTO 		 * nor any other hints.  We treat this case an error.
748d6385b1cSHajimu UMEMOTO 		 */
749d6385b1cSHajimu UMEMOTO 		error = EHOSTUNREACH;
750d6385b1cSHajimu UMEMOTO 	}
751d6385b1cSHajimu UMEMOTO 	if (error == EHOSTUNREACH)
7529cb8d207SAndrey V. Elsukov 		IP6STAT_INC(ip6s_noroute);
753d6385b1cSHajimu UMEMOTO 
7549452b0d2SQing Li 	if (retifp != NULL) {
755d6385b1cSHajimu UMEMOTO 		*retifp = ifp;
7569452b0d2SQing Li 
7579452b0d2SQing Li 		/*
7589452b0d2SQing Li 		 * Adjust the "outgoing" interface.  If we're going to loop
7599452b0d2SQing Li 		 * the packet back to ourselves, the ifp would be the loopback
7609452b0d2SQing Li 		 * interface. However, we'd rather know the interface associated
7619452b0d2SQing Li 		 * to the destination address (which should probably be one of
7629452b0d2SQing Li 		 * our own addresses.)
7639452b0d2SQing Li 		 */
7649452b0d2SQing Li 		if (rt) {
7659452b0d2SQing Li 			if ((rt->rt_ifp->if_flags & IFF_LOOPBACK) &&
7669452b0d2SQing Li 			    (rt->rt_gateway->sa_family == AF_LINK))
7679452b0d2SQing Li 				*retifp =
7689452b0d2SQing Li 					ifnet_byindex(((struct sockaddr_dl *)
7699452b0d2SQing Li 						       rt->rt_gateway)->sdl_index);
7709452b0d2SQing Li 		}
7719452b0d2SQing Li 	}
7729452b0d2SQing Li 
773d6385b1cSHajimu UMEMOTO 	if (retrt != NULL)
774d6385b1cSHajimu UMEMOTO 		*retrt = rt;	/* rt may be NULL */
775d6385b1cSHajimu UMEMOTO 
776d6385b1cSHajimu UMEMOTO 	return (error);
777686cdd19SJun-ichiro itojun Hagino }
778686cdd19SJun-ichiro itojun Hagino 
779a1f7e5f8SHajimu UMEMOTO static int
7801272577eSXin LI in6_selectif(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
78181d5d46bSBjoern A. Zeeb     struct ip6_moptions *mopts, struct route_in6 *ro, struct ifnet **retifp,
7825aa7e8edSBjoern A. Zeeb     struct ifnet *oifp, u_int fibnum)
783a1f7e5f8SHajimu UMEMOTO {
784a1f7e5f8SHajimu UMEMOTO 	int error;
785a1f7e5f8SHajimu UMEMOTO 	struct route_in6 sro;
786a1f7e5f8SHajimu UMEMOTO 	struct rtentry *rt = NULL;
787a1f7e5f8SHajimu UMEMOTO 
7881b46c7f8SBjoern A. Zeeb 	KASSERT(retifp != NULL, ("%s: retifp is NULL", __func__));
7891b46c7f8SBjoern A. Zeeb 
790a1f7e5f8SHajimu UMEMOTO 	if (ro == NULL) {
791a1f7e5f8SHajimu UMEMOTO 		bzero(&sro, sizeof(sro));
792a1f7e5f8SHajimu UMEMOTO 		ro = &sro;
793a1f7e5f8SHajimu UMEMOTO 	}
794a1f7e5f8SHajimu UMEMOTO 
795a1f7e5f8SHajimu UMEMOTO 	if ((error = selectroute(dstsock, opts, mopts, ro, retifp,
79681d5d46bSBjoern A. Zeeb 	    &rt, 1, fibnum)) != 0) {
797f8366b03SSeigo Tanimura 		if (ro == &sro && rt && rt == sro.ro_rt)
798a1f7e5f8SHajimu UMEMOTO 			RTFREE(rt);
7991b46c7f8SBjoern A. Zeeb 		/* Help ND. See oifp comment in in6_selectsrc(). */
8001b46c7f8SBjoern A. Zeeb 		if (oifp != NULL && fibnum == RT_DEFAULT_FIB) {
8011b46c7f8SBjoern A. Zeeb 			*retifp = oifp;
8021b46c7f8SBjoern A. Zeeb 			error = 0;
8031b46c7f8SBjoern A. Zeeb 		}
804a1f7e5f8SHajimu UMEMOTO 		return (error);
805a1f7e5f8SHajimu UMEMOTO 	}
806a1f7e5f8SHajimu UMEMOTO 
807a1f7e5f8SHajimu UMEMOTO 	/*
808a1f7e5f8SHajimu UMEMOTO 	 * do not use a rejected or black hole route.
809a1f7e5f8SHajimu UMEMOTO 	 * XXX: this check should be done in the L2 output routine.
810a1f7e5f8SHajimu UMEMOTO 	 * However, if we skipped this check here, we'd see the following
811a1f7e5f8SHajimu UMEMOTO 	 * scenario:
812a1f7e5f8SHajimu UMEMOTO 	 * - install a rejected route for a scoped address prefix
813a1f7e5f8SHajimu UMEMOTO 	 *   (like fe80::/10)
814a1f7e5f8SHajimu UMEMOTO 	 * - send a packet to a destination that matches the scoped prefix,
815a1f7e5f8SHajimu UMEMOTO 	 *   with ambiguity about the scope zone.
816a1f7e5f8SHajimu UMEMOTO 	 * - pick the outgoing interface from the route, and disambiguate the
817a1f7e5f8SHajimu UMEMOTO 	 *   scope zone with the interface.
818a1f7e5f8SHajimu UMEMOTO 	 * - ip6_output() would try to get another route with the "new"
819a1f7e5f8SHajimu UMEMOTO 	 *   destination, which may be valid.
820a1f7e5f8SHajimu UMEMOTO 	 * - we'd see no error on output.
821a1f7e5f8SHajimu UMEMOTO 	 * Although this may not be very harmful, it should still be confusing.
822a1f7e5f8SHajimu UMEMOTO 	 * We thus reject the case here.
823a1f7e5f8SHajimu UMEMOTO 	 */
824a1f7e5f8SHajimu UMEMOTO 	if (rt && (rt->rt_flags & (RTF_REJECT | RTF_BLACKHOLE))) {
825a1f7e5f8SHajimu UMEMOTO 		int flags = (rt->rt_flags & RTF_HOST ? EHOSTUNREACH : ENETUNREACH);
826a1f7e5f8SHajimu UMEMOTO 
827f8366b03SSeigo Tanimura 		if (ro == &sro && rt && rt == sro.ro_rt)
828a1f7e5f8SHajimu UMEMOTO 			RTFREE(rt);
829a1f7e5f8SHajimu UMEMOTO 		return (flags);
830a1f7e5f8SHajimu UMEMOTO 	}
831a1f7e5f8SHajimu UMEMOTO 
832f8366b03SSeigo Tanimura 	if (ro == &sro && rt && rt == sro.ro_rt)
833a1f7e5f8SHajimu UMEMOTO 		RTFREE(rt);
834a1f7e5f8SHajimu UMEMOTO 	return (0);
835a1f7e5f8SHajimu UMEMOTO }
836a1f7e5f8SHajimu UMEMOTO 
8371272577eSXin LI /*
83881d5d46bSBjoern A. Zeeb  * Public wrapper function to selectroute().
83981d5d46bSBjoern A. Zeeb  *
84081d5d46bSBjoern A. Zeeb  * XXX-BZ in6_selectroute() should and will grow the FIB argument. The
84181d5d46bSBjoern A. Zeeb  * in6_selectroute_fib() function is only there for backward compat on stable.
8421272577eSXin LI  */
843a1f7e5f8SHajimu UMEMOTO int
8441272577eSXin LI in6_selectroute(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
8451272577eSXin LI     struct ip6_moptions *mopts, struct route_in6 *ro,
8466e6b3f7cSQing Li     struct ifnet **retifp, struct rtentry **retrt)
847a1f7e5f8SHajimu UMEMOTO {
8481272577eSXin LI 
849a1f7e5f8SHajimu UMEMOTO 	return (selectroute(dstsock, opts, mopts, ro, retifp,
85081d5d46bSBjoern A. Zeeb 	    retrt, 0, RT_DEFAULT_FIB));
851a1f7e5f8SHajimu UMEMOTO }
852a1f7e5f8SHajimu UMEMOTO 
85381d5d46bSBjoern A. Zeeb #ifndef BURN_BRIDGES
85481d5d46bSBjoern A. Zeeb int
85581d5d46bSBjoern A. Zeeb in6_selectroute_fib(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
85681d5d46bSBjoern A. Zeeb     struct ip6_moptions *mopts, struct route_in6 *ro,
8575aa7e8edSBjoern A. Zeeb     struct ifnet **retifp, struct rtentry **retrt, u_int fibnum)
85881d5d46bSBjoern A. Zeeb {
85981d5d46bSBjoern A. Zeeb 
86081d5d46bSBjoern A. Zeeb 	return (selectroute(dstsock, opts, mopts, ro, retifp,
86181d5d46bSBjoern A. Zeeb 	    retrt, 0, fibnum));
86281d5d46bSBjoern A. Zeeb }
86381d5d46bSBjoern A. Zeeb #endif
86481d5d46bSBjoern A. Zeeb 
865686cdd19SJun-ichiro itojun Hagino /*
866686cdd19SJun-ichiro itojun Hagino  * Default hop limit selection. The precedence is as follows:
867686cdd19SJun-ichiro itojun Hagino  * 1. Hoplimit value specified via ioctl.
868686cdd19SJun-ichiro itojun Hagino  * 2. (If the outgoing interface is detected) the current
869686cdd19SJun-ichiro itojun Hagino  *     hop limit of the interface specified by router advertisement.
870686cdd19SJun-ichiro itojun Hagino  * 3. The system default hoplimit.
871686cdd19SJun-ichiro itojun Hagino  */
872686cdd19SJun-ichiro itojun Hagino int
873fc384fa5SBjoern A. Zeeb in6_selecthlim(struct inpcb *in6p, struct ifnet *ifp)
874686cdd19SJun-ichiro itojun Hagino {
8751272577eSXin LI 
876686cdd19SJun-ichiro itojun Hagino 	if (in6p && in6p->in6p_hops >= 0)
877686cdd19SJun-ichiro itojun Hagino 		return (in6p->in6p_hops);
878686cdd19SJun-ichiro itojun Hagino 	else if (ifp)
87931b1bfe1SHajimu UMEMOTO 		return (ND_IFINFO(ifp)->chlim);
88097d8d152SAndre Oppermann 	else if (in6p && !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
88197d8d152SAndre Oppermann 		struct route_in6 ro6;
88297d8d152SAndre Oppermann 		struct ifnet *lifp;
88397d8d152SAndre Oppermann 
88497d8d152SAndre Oppermann 		bzero(&ro6, sizeof(ro6));
88597d8d152SAndre Oppermann 		ro6.ro_dst.sin6_family = AF_INET6;
88697d8d152SAndre Oppermann 		ro6.ro_dst.sin6_len = sizeof(struct sockaddr_in6);
88797d8d152SAndre Oppermann 		ro6.ro_dst.sin6_addr = in6p->in6p_faddr;
8885aa7e8edSBjoern A. Zeeb 		in6_rtalloc(&ro6, in6p->inp_inc.inc_fibnum);
88997d8d152SAndre Oppermann 		if (ro6.ro_rt) {
89097d8d152SAndre Oppermann 			lifp = ro6.ro_rt->rt_ifp;
89197d8d152SAndre Oppermann 			RTFREE(ro6.ro_rt);
89297d8d152SAndre Oppermann 			if (lifp)
89397d8d152SAndre Oppermann 				return (ND_IFINFO(lifp)->chlim);
894f8315b5fSBjoern A. Zeeb 		}
89597d8d152SAndre Oppermann 	}
896603724d3SBjoern A. Zeeb 	return (V_ip6_defhlim);
897686cdd19SJun-ichiro itojun Hagino }
898686cdd19SJun-ichiro itojun Hagino 
899686cdd19SJun-ichiro itojun Hagino /*
900686cdd19SJun-ichiro itojun Hagino  * XXX: this is borrowed from in6_pcbbind(). If possible, we should
901686cdd19SJun-ichiro itojun Hagino  * share this function by all *bsd*...
902686cdd19SJun-ichiro itojun Hagino  */
903686cdd19SJun-ichiro itojun Hagino int
9041272577eSXin LI in6_pcbsetport(struct in6_addr *laddr, struct inpcb *inp, struct ucred *cred)
905686cdd19SJun-ichiro itojun Hagino {
906686cdd19SJun-ichiro itojun Hagino 	struct socket *so = inp->inp_socket;
907efc76f72SBjoern A. Zeeb 	u_int16_t lport = 0;
90868e0d7e0SRobert Watson 	int error, lookupflags = 0;
909efc76f72SBjoern A. Zeeb #ifdef INVARIANTS
910686cdd19SJun-ichiro itojun Hagino 	struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
911efc76f72SBjoern A. Zeeb #endif
912686cdd19SJun-ichiro itojun Hagino 
9138501a69cSRobert Watson 	INP_WLOCK_ASSERT(inp);
914fa046d87SRobert Watson 	INP_HASH_WLOCK_ASSERT(pcbinfo);
9158deea4a8SRobert Watson 
916b89e82ddSJamie Gritton 	error = prison_local_ip6(cred, laddr,
917b89e82ddSJamie Gritton 	    ((inp->inp_flags & IN6P_IPV6_V6ONLY) != 0));
918b89e82ddSJamie Gritton 	if (error)
919b89e82ddSJamie Gritton 		return(error);
920413628a7SBjoern A. Zeeb 
921686cdd19SJun-ichiro itojun Hagino 	/* XXX: this is redundant when called from in6_pcbbind */
922686cdd19SJun-ichiro itojun Hagino 	if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
92368e0d7e0SRobert Watson 		lookupflags = INPLOOKUP_WILDCARD;
924686cdd19SJun-ichiro itojun Hagino 
925686cdd19SJun-ichiro itojun Hagino 	inp->inp_flags |= INP_ANONPORT;
926686cdd19SJun-ichiro itojun Hagino 
92768e0d7e0SRobert Watson 	error = in_pcb_lport(inp, NULL, &lport, cred, lookupflags);
928efc76f72SBjoern A. Zeeb 	if (error != 0)
929efc76f72SBjoern A. Zeeb 		return (error);
930686cdd19SJun-ichiro itojun Hagino 
931686cdd19SJun-ichiro itojun Hagino 	inp->inp_lport = lport;
932686cdd19SJun-ichiro itojun Hagino 	if (in_pcbinshash(inp) != 0) {
933686cdd19SJun-ichiro itojun Hagino 		inp->in6p_laddr = in6addr_any;
934686cdd19SJun-ichiro itojun Hagino 		inp->inp_lport = 0;
935686cdd19SJun-ichiro itojun Hagino 		return (EAGAIN);
936686cdd19SJun-ichiro itojun Hagino 	}
937686cdd19SJun-ichiro itojun Hagino 
938686cdd19SJun-ichiro itojun Hagino 	return (0);
939686cdd19SJun-ichiro itojun Hagino }
940686cdd19SJun-ichiro itojun Hagino 
9417fc91b3fSHajimu UMEMOTO void
9421272577eSXin LI addrsel_policy_init(void)
9437fc91b3fSHajimu UMEMOTO {
9447fc91b3fSHajimu UMEMOTO 
9457fc91b3fSHajimu UMEMOTO 	init_policy_queue();
9467fc91b3fSHajimu UMEMOTO 
9477fc91b3fSHajimu UMEMOTO 	/* initialize the "last resort" policy */
948603724d3SBjoern A. Zeeb 	bzero(&V_defaultaddrpolicy, sizeof(V_defaultaddrpolicy));
949603724d3SBjoern A. Zeeb 	V_defaultaddrpolicy.label = ADDR_LABEL_NOTAPP;
9501ed81b73SMarko Zec 
9511ed81b73SMarko Zec 	if (!IS_DEFAULT_VNET(curvnet))
9521ed81b73SMarko Zec 		return;
9531ed81b73SMarko Zec 
9541ed81b73SMarko Zec 	ADDRSEL_LOCK_INIT();
9551ed81b73SMarko Zec 	ADDRSEL_SXLOCK_INIT();
9567fc91b3fSHajimu UMEMOTO }
9577fc91b3fSHajimu UMEMOTO 
958d6385b1cSHajimu UMEMOTO static struct in6_addrpolicy *
9591272577eSXin LI lookup_addrsel_policy(struct sockaddr_in6 *key)
960d6385b1cSHajimu UMEMOTO {
961d6385b1cSHajimu UMEMOTO 	struct in6_addrpolicy *match = NULL;
962d6385b1cSHajimu UMEMOTO 
963d6385b1cSHajimu UMEMOTO 	ADDRSEL_LOCK();
964d6385b1cSHajimu UMEMOTO 	match = match_addrsel_policy(key);
965d6385b1cSHajimu UMEMOTO 
966d6385b1cSHajimu UMEMOTO 	if (match == NULL)
967603724d3SBjoern A. Zeeb 		match = &V_defaultaddrpolicy;
968d6385b1cSHajimu UMEMOTO 	else
969d6385b1cSHajimu UMEMOTO 		match->use++;
970d6385b1cSHajimu UMEMOTO 	ADDRSEL_UNLOCK();
971d6385b1cSHajimu UMEMOTO 
972d6385b1cSHajimu UMEMOTO 	return (match);
973d6385b1cSHajimu UMEMOTO }
974d6385b1cSHajimu UMEMOTO 
9757fc91b3fSHajimu UMEMOTO /*
9767fc91b3fSHajimu UMEMOTO  * Subroutines to manage the address selection policy table via sysctl.
9777fc91b3fSHajimu UMEMOTO  */
9787fc91b3fSHajimu UMEMOTO struct walkarg {
9797fc91b3fSHajimu UMEMOTO 	struct sysctl_req *w_req;
9807fc91b3fSHajimu UMEMOTO };
9817fc91b3fSHajimu UMEMOTO 
9827fc91b3fSHajimu UMEMOTO static int in6_src_sysctl(SYSCTL_HANDLER_ARGS);
9837fc91b3fSHajimu UMEMOTO SYSCTL_DECL(_net_inet6_ip6);
9846472ac3dSEd Schouten static SYSCTL_NODE(_net_inet6_ip6, IPV6CTL_ADDRCTLPOLICY, addrctlpolicy,
9857fc91b3fSHajimu UMEMOTO 	CTLFLAG_RD, in6_src_sysctl, "");
9867fc91b3fSHajimu UMEMOTO 
9877fc91b3fSHajimu UMEMOTO static int
9887fc91b3fSHajimu UMEMOTO in6_src_sysctl(SYSCTL_HANDLER_ARGS)
9897fc91b3fSHajimu UMEMOTO {
9907fc91b3fSHajimu UMEMOTO 	struct walkarg w;
9917fc91b3fSHajimu UMEMOTO 
9927fc91b3fSHajimu UMEMOTO 	if (req->newptr)
9937fc91b3fSHajimu UMEMOTO 		return EPERM;
9947fc91b3fSHajimu UMEMOTO 
9957fc91b3fSHajimu UMEMOTO 	bzero(&w, sizeof(w));
9967fc91b3fSHajimu UMEMOTO 	w.w_req = req;
9977fc91b3fSHajimu UMEMOTO 
9987fc91b3fSHajimu UMEMOTO 	return (walk_addrsel_policy(dump_addrsel_policyent, &w));
9997fc91b3fSHajimu UMEMOTO }
10007fc91b3fSHajimu UMEMOTO 
10017fc91b3fSHajimu UMEMOTO int
10021272577eSXin LI in6_src_ioctl(u_long cmd, caddr_t data)
10037fc91b3fSHajimu UMEMOTO {
10047fc91b3fSHajimu UMEMOTO 	struct in6_addrpolicy ent0;
10057fc91b3fSHajimu UMEMOTO 
10067fc91b3fSHajimu UMEMOTO 	if (cmd != SIOCAADDRCTL_POLICY && cmd != SIOCDADDRCTL_POLICY)
10077fc91b3fSHajimu UMEMOTO 		return (EOPNOTSUPP); /* check for safety */
10087fc91b3fSHajimu UMEMOTO 
10097fc91b3fSHajimu UMEMOTO 	ent0 = *(struct in6_addrpolicy *)data;
10107fc91b3fSHajimu UMEMOTO 
10117fc91b3fSHajimu UMEMOTO 	if (ent0.label == ADDR_LABEL_NOTAPP)
10127fc91b3fSHajimu UMEMOTO 		return (EINVAL);
10137fc91b3fSHajimu UMEMOTO 	/* check if the prefix mask is consecutive. */
10147fc91b3fSHajimu UMEMOTO 	if (in6_mask2len(&ent0.addrmask.sin6_addr, NULL) < 0)
10157fc91b3fSHajimu UMEMOTO 		return (EINVAL);
10167fc91b3fSHajimu UMEMOTO 	/* clear trailing garbages (if any) of the prefix address. */
10171dc8f6a8SAlexander V. Chernikov 	IN6_MASK_ADDR(&ent0.addr.sin6_addr, &ent0.addrmask.sin6_addr);
10187fc91b3fSHajimu UMEMOTO 	ent0.use = 0;
10197fc91b3fSHajimu UMEMOTO 
10207fc91b3fSHajimu UMEMOTO 	switch (cmd) {
10217fc91b3fSHajimu UMEMOTO 	case SIOCAADDRCTL_POLICY:
10227fc91b3fSHajimu UMEMOTO 		return (add_addrsel_policyent(&ent0));
10237fc91b3fSHajimu UMEMOTO 	case SIOCDADDRCTL_POLICY:
10247fc91b3fSHajimu UMEMOTO 		return (delete_addrsel_policyent(&ent0));
10257fc91b3fSHajimu UMEMOTO 	}
10267fc91b3fSHajimu UMEMOTO 
10277fc91b3fSHajimu UMEMOTO 	return (0);		/* XXX: compromise compilers */
10287fc91b3fSHajimu UMEMOTO }
10297fc91b3fSHajimu UMEMOTO 
10307fc91b3fSHajimu UMEMOTO /*
10317fc91b3fSHajimu UMEMOTO  * The followings are implementation of the policy table using a
10327fc91b3fSHajimu UMEMOTO  * simple tail queue.
10337fc91b3fSHajimu UMEMOTO  * XXX such details should be hidden.
10347fc91b3fSHajimu UMEMOTO  * XXX implementation using binary tree should be more efficient.
10357fc91b3fSHajimu UMEMOTO  */
10367fc91b3fSHajimu UMEMOTO struct addrsel_policyent {
10377fc91b3fSHajimu UMEMOTO 	TAILQ_ENTRY(addrsel_policyent) ape_entry;
10387fc91b3fSHajimu UMEMOTO 	struct in6_addrpolicy ape_policy;
10397fc91b3fSHajimu UMEMOTO };
10407fc91b3fSHajimu UMEMOTO 
10417fc91b3fSHajimu UMEMOTO TAILQ_HEAD(addrsel_policyhead, addrsel_policyent);
10427fc91b3fSHajimu UMEMOTO 
10433e288e62SDimitry Andric static VNET_DEFINE(struct addrsel_policyhead, addrsel_policytab);
10441e77c105SRobert Watson #define	V_addrsel_policytab		VNET(addrsel_policytab)
10457fc91b3fSHajimu UMEMOTO 
10467fc91b3fSHajimu UMEMOTO static void
10471272577eSXin LI init_policy_queue(void)
10487fc91b3fSHajimu UMEMOTO {
10491272577eSXin LI 
1050603724d3SBjoern A. Zeeb 	TAILQ_INIT(&V_addrsel_policytab);
10517fc91b3fSHajimu UMEMOTO }
10527fc91b3fSHajimu UMEMOTO 
10537fc91b3fSHajimu UMEMOTO static int
10541272577eSXin LI add_addrsel_policyent(struct in6_addrpolicy *newpolicy)
10557fc91b3fSHajimu UMEMOTO {
10567fc91b3fSHajimu UMEMOTO 	struct addrsel_policyent *new, *pol;
10577fc91b3fSHajimu UMEMOTO 
10581ede983cSDag-Erling Smørgrav 	new = malloc(sizeof(*new), M_IFADDR,
1059349b668aSHajimu UMEMOTO 	       M_WAITOK);
10605d525653SHajimu UMEMOTO 	ADDRSEL_XLOCK();
10617fc91b3fSHajimu UMEMOTO 	ADDRSEL_LOCK();
10627fc91b3fSHajimu UMEMOTO 
10637fc91b3fSHajimu UMEMOTO 	/* duplication check */
1064603724d3SBjoern A. Zeeb 	TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
1065c1a049acSSUZUKI Shinsuke 		if (IN6_ARE_ADDR_EQUAL(&newpolicy->addr.sin6_addr,
1066c1a049acSSUZUKI Shinsuke 				       &pol->ape_policy.addr.sin6_addr) &&
1067c1a049acSSUZUKI Shinsuke 		    IN6_ARE_ADDR_EQUAL(&newpolicy->addrmask.sin6_addr,
1068c1a049acSSUZUKI Shinsuke 				       &pol->ape_policy.addrmask.sin6_addr)) {
1069349b668aSHajimu UMEMOTO 			ADDRSEL_UNLOCK();
10705d525653SHajimu UMEMOTO 			ADDRSEL_XUNLOCK();
10711ede983cSDag-Erling Smørgrav 			free(new, M_IFADDR);
10727fc91b3fSHajimu UMEMOTO 			return (EEXIST);	/* or override it? */
10737fc91b3fSHajimu UMEMOTO 		}
10747fc91b3fSHajimu UMEMOTO 	}
10757fc91b3fSHajimu UMEMOTO 
10767fc91b3fSHajimu UMEMOTO 	bzero(new, sizeof(*new));
10777fc91b3fSHajimu UMEMOTO 
10787fc91b3fSHajimu UMEMOTO 	/* XXX: should validate entry */
10797fc91b3fSHajimu UMEMOTO 	new->ape_policy = *newpolicy;
10807fc91b3fSHajimu UMEMOTO 
1081603724d3SBjoern A. Zeeb 	TAILQ_INSERT_TAIL(&V_addrsel_policytab, new, ape_entry);
10827fc91b3fSHajimu UMEMOTO 	ADDRSEL_UNLOCK();
10835d525653SHajimu UMEMOTO 	ADDRSEL_XUNLOCK();
10847fc91b3fSHajimu UMEMOTO 
10857fc91b3fSHajimu UMEMOTO 	return (0);
10867fc91b3fSHajimu UMEMOTO }
10877fc91b3fSHajimu UMEMOTO 
10887fc91b3fSHajimu UMEMOTO static int
10891272577eSXin LI delete_addrsel_policyent(struct in6_addrpolicy *key)
10907fc91b3fSHajimu UMEMOTO {
10917fc91b3fSHajimu UMEMOTO 	struct addrsel_policyent *pol;
10927fc91b3fSHajimu UMEMOTO 
10935d525653SHajimu UMEMOTO 	ADDRSEL_XLOCK();
10947fc91b3fSHajimu UMEMOTO 	ADDRSEL_LOCK();
10957fc91b3fSHajimu UMEMOTO 
10967fc91b3fSHajimu UMEMOTO 	/* search for the entry in the table */
1097603724d3SBjoern A. Zeeb 	TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
1098c1a049acSSUZUKI Shinsuke 		if (IN6_ARE_ADDR_EQUAL(&key->addr.sin6_addr,
1099c1a049acSSUZUKI Shinsuke 		    &pol->ape_policy.addr.sin6_addr) &&
1100c1a049acSSUZUKI Shinsuke 		    IN6_ARE_ADDR_EQUAL(&key->addrmask.sin6_addr,
1101c1a049acSSUZUKI Shinsuke 		    &pol->ape_policy.addrmask.sin6_addr)) {
11027fc91b3fSHajimu UMEMOTO 			break;
11037fc91b3fSHajimu UMEMOTO 		}
11047fc91b3fSHajimu UMEMOTO 	}
1105349b668aSHajimu UMEMOTO 	if (pol == NULL) {
1106349b668aSHajimu UMEMOTO 		ADDRSEL_UNLOCK();
11075d525653SHajimu UMEMOTO 		ADDRSEL_XUNLOCK();
11087fc91b3fSHajimu UMEMOTO 		return (ESRCH);
1109349b668aSHajimu UMEMOTO 	}
11107fc91b3fSHajimu UMEMOTO 
1111603724d3SBjoern A. Zeeb 	TAILQ_REMOVE(&V_addrsel_policytab, pol, ape_entry);
11127fc91b3fSHajimu UMEMOTO 	ADDRSEL_UNLOCK();
11135d525653SHajimu UMEMOTO 	ADDRSEL_XUNLOCK();
1114ecc5c738SAndrey V. Elsukov 	free(pol, M_IFADDR);
11157fc91b3fSHajimu UMEMOTO 
11167fc91b3fSHajimu UMEMOTO 	return (0);
11177fc91b3fSHajimu UMEMOTO }
11187fc91b3fSHajimu UMEMOTO 
11197fc91b3fSHajimu UMEMOTO static int
1120f1e0de69SDavid E. O'Brien walk_addrsel_policy(int (*callback)(struct in6_addrpolicy *, void *), void *w)
11217fc91b3fSHajimu UMEMOTO {
11227fc91b3fSHajimu UMEMOTO 	struct addrsel_policyent *pol;
11237fc91b3fSHajimu UMEMOTO 	int error = 0;
11247fc91b3fSHajimu UMEMOTO 
11255d525653SHajimu UMEMOTO 	ADDRSEL_SLOCK();
1126603724d3SBjoern A. Zeeb 	TAILQ_FOREACH(pol, &V_addrsel_policytab, ape_entry) {
11275d525653SHajimu UMEMOTO 		if ((error = (*callback)(&pol->ape_policy, w)) != 0) {
11285d525653SHajimu UMEMOTO 			ADDRSEL_SUNLOCK();
11297fc91b3fSHajimu UMEMOTO 			return (error);
1130349b668aSHajimu UMEMOTO 		}
11315d525653SHajimu UMEMOTO 	}
11325d525653SHajimu UMEMOTO 	ADDRSEL_SUNLOCK();
11337fc91b3fSHajimu UMEMOTO 	return (error);
11347fc91b3fSHajimu UMEMOTO }
11357fc91b3fSHajimu UMEMOTO 
11367fc91b3fSHajimu UMEMOTO static int
11371272577eSXin LI dump_addrsel_policyent(struct in6_addrpolicy *pol, void *arg)
11387fc91b3fSHajimu UMEMOTO {
11397fc91b3fSHajimu UMEMOTO 	int error = 0;
11407fc91b3fSHajimu UMEMOTO 	struct walkarg *w = arg;
11417fc91b3fSHajimu UMEMOTO 
11427fc91b3fSHajimu UMEMOTO 	error = SYSCTL_OUT(w->w_req, pol, sizeof(*pol));
11437fc91b3fSHajimu UMEMOTO 
11447fc91b3fSHajimu UMEMOTO 	return (error);
11457fc91b3fSHajimu UMEMOTO }
1146d6385b1cSHajimu UMEMOTO 
1147d6385b1cSHajimu UMEMOTO static struct in6_addrpolicy *
11481272577eSXin LI match_addrsel_policy(struct sockaddr_in6 *key)
1149d6385b1cSHajimu UMEMOTO {
1150d6385b1cSHajimu UMEMOTO 	struct addrsel_policyent *pent;
1151d6385b1cSHajimu UMEMOTO 	struct in6_addrpolicy *bestpol = NULL, *pol;
1152d6385b1cSHajimu UMEMOTO 	int matchlen, bestmatchlen = -1;
1153d6385b1cSHajimu UMEMOTO 	u_char *mp, *ep, *k, *p, m;
1154d6385b1cSHajimu UMEMOTO 
1155603724d3SBjoern A. Zeeb 	TAILQ_FOREACH(pent, &V_addrsel_policytab, ape_entry) {
1156d6385b1cSHajimu UMEMOTO 		matchlen = 0;
1157d6385b1cSHajimu UMEMOTO 
1158d6385b1cSHajimu UMEMOTO 		pol = &pent->ape_policy;
1159d6385b1cSHajimu UMEMOTO 		mp = (u_char *)&pol->addrmask.sin6_addr;
1160d6385b1cSHajimu UMEMOTO 		ep = mp + 16;	/* XXX: scope field? */
1161d6385b1cSHajimu UMEMOTO 		k = (u_char *)&key->sin6_addr;
1162d6385b1cSHajimu UMEMOTO 		p = (u_char *)&pol->addr.sin6_addr;
1163d6385b1cSHajimu UMEMOTO 		for (; mp < ep && *mp; mp++, k++, p++) {
1164d6385b1cSHajimu UMEMOTO 			m = *mp;
1165d6385b1cSHajimu UMEMOTO 			if ((*k & m) != *p)
1166d6385b1cSHajimu UMEMOTO 				goto next; /* not match */
1167d6385b1cSHajimu UMEMOTO 			if (m == 0xff) /* short cut for a typical case */
1168d6385b1cSHajimu UMEMOTO 				matchlen += 8;
1169d6385b1cSHajimu UMEMOTO 			else {
1170d6385b1cSHajimu UMEMOTO 				while (m >= 0x80) {
1171d6385b1cSHajimu UMEMOTO 					matchlen++;
1172d6385b1cSHajimu UMEMOTO 					m <<= 1;
1173d6385b1cSHajimu UMEMOTO 				}
1174d6385b1cSHajimu UMEMOTO 			}
1175d6385b1cSHajimu UMEMOTO 		}
1176d6385b1cSHajimu UMEMOTO 
1177d6385b1cSHajimu UMEMOTO 		/* matched.  check if this is better than the current best. */
1178d6385b1cSHajimu UMEMOTO 		if (bestpol == NULL ||
1179d6385b1cSHajimu UMEMOTO 		    matchlen > bestmatchlen) {
1180d6385b1cSHajimu UMEMOTO 			bestpol = pol;
1181d6385b1cSHajimu UMEMOTO 			bestmatchlen = matchlen;
1182d6385b1cSHajimu UMEMOTO 		}
1183d6385b1cSHajimu UMEMOTO 
1184d6385b1cSHajimu UMEMOTO 	  next:
1185d6385b1cSHajimu UMEMOTO 		continue;
1186d6385b1cSHajimu UMEMOTO 	}
1187d6385b1cSHajimu UMEMOTO 
1188d6385b1cSHajimu UMEMOTO 	return (bestpol);
1189d6385b1cSHajimu UMEMOTO }
1190