xref: /freebsd/usr.sbin/rtadvd/rrenum.c (revision 6f74a8c7a06394d06aaba2a2a287f39fa27c2a44)
1ae326725SJun-ichiro itojun Hagino /*	$FreeBSD$	*/
2fa19f9beSHajimu UMEMOTO /*	$KAME: rrenum.c,v 1.12 2002/06/10 19:59:47 itojun Exp $	*/
3b26e03e9SKris Kennaway 
49a4365d0SYoshinobu Inoue /*
59a4365d0SYoshinobu Inoue  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
69a4365d0SYoshinobu Inoue  * All rights reserved.
79a4365d0SYoshinobu Inoue  *
89a4365d0SYoshinobu Inoue  * Redistribution and use in source and binary forms, with or without
99a4365d0SYoshinobu Inoue  * modification, are permitted provided that the following conditions
109a4365d0SYoshinobu Inoue  * are met:
119a4365d0SYoshinobu Inoue  * 1. Redistributions of source code must retain the above copyright
129a4365d0SYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer.
139a4365d0SYoshinobu Inoue  * 2. Redistributions in binary form must reproduce the above copyright
149a4365d0SYoshinobu Inoue  *    notice, this list of conditions and the following disclaimer in the
159a4365d0SYoshinobu Inoue  *    documentation and/or other materials provided with the distribution.
169a4365d0SYoshinobu Inoue  * 3. Neither the name of the project nor the names of its contributors
179a4365d0SYoshinobu Inoue  *    may be used to endorse or promote products derived from this software
189a4365d0SYoshinobu Inoue  *    without specific prior written permission.
199a4365d0SYoshinobu Inoue  *
209a4365d0SYoshinobu Inoue  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
219a4365d0SYoshinobu Inoue  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
229a4365d0SYoshinobu Inoue  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
239a4365d0SYoshinobu Inoue  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
249a4365d0SYoshinobu Inoue  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
259a4365d0SYoshinobu Inoue  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
269a4365d0SYoshinobu Inoue  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
279a4365d0SYoshinobu Inoue  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
289a4365d0SYoshinobu Inoue  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
299a4365d0SYoshinobu Inoue  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
309a4365d0SYoshinobu Inoue  * SUCH DAMAGE.
319a4365d0SYoshinobu Inoue  */
3233841545SHajimu UMEMOTO #include <sys/types.h>
339a4365d0SYoshinobu Inoue #include <sys/param.h>
349a4365d0SYoshinobu Inoue #include <sys/ioctl.h>
359a4365d0SYoshinobu Inoue #include <sys/socket.h>
369a4365d0SYoshinobu Inoue #include <sys/sysctl.h>
379a4365d0SYoshinobu Inoue 
389a4365d0SYoshinobu Inoue #include <net/if.h>
399a4365d0SYoshinobu Inoue #include <net/if_var.h>
409a4365d0SYoshinobu Inoue #include <net/route.h>
419a4365d0SYoshinobu Inoue #include <netinet/in.h>
429a4365d0SYoshinobu Inoue #include <netinet/in_var.h>
439a4365d0SYoshinobu Inoue #include <netinet/icmp6.h>
449a4365d0SYoshinobu Inoue 
459a4365d0SYoshinobu Inoue #include <arpa/inet.h>
469a4365d0SYoshinobu Inoue 
479a4365d0SYoshinobu Inoue #include <errno.h>
489a4365d0SYoshinobu Inoue #include <string.h>
499a4365d0SYoshinobu Inoue #include <stdlib.h>
509a4365d0SYoshinobu Inoue #include <syslog.h>
5133841545SHajimu UMEMOTO #include "rtadvd.h"
529a4365d0SYoshinobu Inoue #include "rrenum.h"
539a4365d0SYoshinobu Inoue #include "if.h"
549a4365d0SYoshinobu Inoue 
559a4365d0SYoshinobu Inoue #define	RR_ISSET_SEGNUM(segnum_bits, segnum) \
569a4365d0SYoshinobu Inoue 	((((segnum_bits)[(segnum) >> 5]) & (1 << ((segnum) & 31))) != 0)
579a4365d0SYoshinobu Inoue #define	RR_SET_SEGNUM(segnum_bits, segnum) \
589a4365d0SYoshinobu Inoue 	(((segnum_bits)[(segnum) >> 5]) |= (1 << ((segnum) & 31)))
599a4365d0SYoshinobu Inoue 
609a4365d0SYoshinobu Inoue struct rr_operation {
619a4365d0SYoshinobu Inoue 	u_long	rro_seqnum;
629a4365d0SYoshinobu Inoue 	u_long	rro_segnum_bits[8];
639a4365d0SYoshinobu Inoue };
649a4365d0SYoshinobu Inoue 
659a4365d0SYoshinobu Inoue static struct rr_operation rro;
669a4365d0SYoshinobu Inoue static int rr_rcvifindex;
67b26e03e9SKris Kennaway static int rrcmd2pco[RPM_PCO_MAX] = {
68b26e03e9SKris Kennaway 	0,
699a4365d0SYoshinobu Inoue 	SIOCAIFPREFIX_IN6,
709a4365d0SYoshinobu Inoue 	SIOCCIFPREFIX_IN6,
719a4365d0SYoshinobu Inoue 	SIOCSGIFPREFIX_IN6
729a4365d0SYoshinobu Inoue };
73b26e03e9SKris Kennaway static int s = -1;
749a4365d0SYoshinobu Inoue 
759a4365d0SYoshinobu Inoue /*
769a4365d0SYoshinobu Inoue  * Check validity of a Prefix Control Operation(PCO).
779a4365d0SYoshinobu Inoue  * Return 0 on success, 1 on failure.
789a4365d0SYoshinobu Inoue  */
799a4365d0SYoshinobu Inoue static int
809a4365d0SYoshinobu Inoue rr_pco_check(int len, struct rr_pco_match *rpm)
819a4365d0SYoshinobu Inoue {
829a4365d0SYoshinobu Inoue 	struct rr_pco_use *rpu, *rpulim;
839a4365d0SYoshinobu Inoue 	int checklen;
849a4365d0SYoshinobu Inoue 
859a4365d0SYoshinobu Inoue 	/* rpm->rpm_len must be (4N * 3) as router-renum-05.txt */
869a4365d0SYoshinobu Inoue 	if ((rpm->rpm_len - 3) < 0 || /* must be at least 3 */
879a4365d0SYoshinobu Inoue 	    (rpm->rpm_len - 3) & 0x3) { /* must be multiple of 4 */
889a4365d0SYoshinobu Inoue 		syslog(LOG_WARNING, "<%s> rpm_len %d is not 4N * 3",
891533bed0SHajimu UMEMOTO 		       __func__, rpm->rpm_len);
909a4365d0SYoshinobu Inoue 		return 1;
919a4365d0SYoshinobu Inoue 	}
929a4365d0SYoshinobu Inoue 	/* rpm->rpm_code must be valid value */
939a4365d0SYoshinobu Inoue 	switch (rpm->rpm_code) {
949a4365d0SYoshinobu Inoue 	case RPM_PCO_ADD:
959a4365d0SYoshinobu Inoue 	case RPM_PCO_CHANGE:
969a4365d0SYoshinobu Inoue 	case RPM_PCO_SETGLOBAL:
979a4365d0SYoshinobu Inoue 		break;
989a4365d0SYoshinobu Inoue 	default:
991533bed0SHajimu UMEMOTO 		syslog(LOG_WARNING, "<%s> unknown rpm_code %d", __func__,
1009a4365d0SYoshinobu Inoue 		       rpm->rpm_code);
1019a4365d0SYoshinobu Inoue 		return 1;
1029a4365d0SYoshinobu Inoue 	}
1039a4365d0SYoshinobu Inoue 	/* rpm->rpm_matchlen must be 0 to 128 inclusive */
1049a4365d0SYoshinobu Inoue 	if (rpm->rpm_matchlen > 128) {
1059a4365d0SYoshinobu Inoue 		syslog(LOG_WARNING, "<%s> rpm_matchlen %d is over 128",
1061533bed0SHajimu UMEMOTO 		       __func__, rpm->rpm_matchlen);
1079a4365d0SYoshinobu Inoue 		return 1;
1089a4365d0SYoshinobu Inoue 	}
1099a4365d0SYoshinobu Inoue 
1109a4365d0SYoshinobu Inoue 	/*
1119a4365d0SYoshinobu Inoue 	 * rpu->rpu_uselen, rpu->rpu_keeplen, and sum of them must be
1129a4365d0SYoshinobu Inoue 	 * between 0 and 128 inclusive
1139a4365d0SYoshinobu Inoue 	 */
1149a4365d0SYoshinobu Inoue 	for (rpu = (struct rr_pco_use *)(rpm + 1),
1159a4365d0SYoshinobu Inoue 	     rpulim = (struct rr_pco_use *)((char *)rpm + len);
1169a4365d0SYoshinobu Inoue 	     rpu < rpulim;
1179a4365d0SYoshinobu Inoue 	     rpu += 1) {
1189a4365d0SYoshinobu Inoue 		checklen = rpu->rpu_uselen;
1199a4365d0SYoshinobu Inoue 		checklen += rpu->rpu_keeplen;
1209a4365d0SYoshinobu Inoue 		/*
1219a4365d0SYoshinobu Inoue 		 * omit these check, because either of rpu_uselen
1229a4365d0SYoshinobu Inoue 		 * and rpu_keeplen is unsigned char
1239a4365d0SYoshinobu Inoue 		 *  (128 > rpu_uselen > 0)
1249a4365d0SYoshinobu Inoue 		 *  (128 > rpu_keeplen > 0)
1259a4365d0SYoshinobu Inoue 		 *  (rpu_uselen + rpu_keeplen > 0)
1269a4365d0SYoshinobu Inoue 		 */
1279a4365d0SYoshinobu Inoue 		if (checklen > 128) {
1289a4365d0SYoshinobu Inoue 			syslog(LOG_WARNING, "<%s> sum of rpu_uselen %d and"
1299a4365d0SYoshinobu Inoue 			       " rpu_keeplen %d is %d(over 128)",
1301533bed0SHajimu UMEMOTO 			       __func__, rpu->rpu_uselen,
1319a4365d0SYoshinobu Inoue 			       rpu->rpu_keeplen,
1329a4365d0SYoshinobu Inoue 			       rpu->rpu_uselen + rpu->rpu_keeplen);
1339a4365d0SYoshinobu Inoue 			return 1;
1349a4365d0SYoshinobu Inoue 		}
1359a4365d0SYoshinobu Inoue 	}
1369a4365d0SYoshinobu Inoue 	return 0;
1379a4365d0SYoshinobu Inoue }
1389a4365d0SYoshinobu Inoue 
1399a4365d0SYoshinobu Inoue static void
14033841545SHajimu UMEMOTO do_use_prefix(int len, struct rr_pco_match *rpm,
14133841545SHajimu UMEMOTO 	      struct in6_rrenumreq *irr, int ifindex)
14233841545SHajimu UMEMOTO {
1439a4365d0SYoshinobu Inoue 	struct rr_pco_use *rpu, *rpulim;
14433841545SHajimu UMEMOTO 	struct rainfo *rai;
14533841545SHajimu UMEMOTO 	struct prefix *pp;
1469a4365d0SYoshinobu Inoue 
1479a4365d0SYoshinobu Inoue 	rpu = (struct rr_pco_use *)(rpm + 1);
1489a4365d0SYoshinobu Inoue 	rpulim = (struct rr_pco_use *)((char *)rpm + len);
1499a4365d0SYoshinobu Inoue 
15033841545SHajimu UMEMOTO 	if (rpu == rpulim) {	/* no use prefix */
1519a4365d0SYoshinobu Inoue 		if (rpm->rpm_code == RPM_PCO_ADD)
1529a4365d0SYoshinobu Inoue 			return;
1539a4365d0SYoshinobu Inoue 
1549a4365d0SYoshinobu Inoue 		irr->irr_u_uselen = 0;
1559a4365d0SYoshinobu Inoue 		irr->irr_u_keeplen = 0;
1569a4365d0SYoshinobu Inoue 		irr->irr_raf_mask_onlink = 0;
1579a4365d0SYoshinobu Inoue 		irr->irr_raf_mask_auto = 0;
1589a4365d0SYoshinobu Inoue 		irr->irr_vltime = 0;
1599a4365d0SYoshinobu Inoue 		irr->irr_pltime = 0;
1609a4365d0SYoshinobu Inoue 		memset(&irr->irr_flags, 0, sizeof(irr->irr_flags));
1619a4365d0SYoshinobu Inoue 		irr->irr_useprefix.sin6_len = 0; /* let it mean, no addition */
1629a4365d0SYoshinobu Inoue 		irr->irr_useprefix.sin6_family = 0;
1639a4365d0SYoshinobu Inoue 		irr->irr_useprefix.sin6_addr = in6addr_any;
1649a4365d0SYoshinobu Inoue 		if (ioctl(s, rrcmd2pco[rpm->rpm_code], (caddr_t)irr) < 0 &&
1659a4365d0SYoshinobu Inoue 		    errno != EADDRNOTAVAIL)
1661533bed0SHajimu UMEMOTO 			syslog(LOG_ERR, "<%s> ioctl: %s", __func__,
1679a4365d0SYoshinobu Inoue 			       strerror(errno));
1689a4365d0SYoshinobu Inoue 		return;
1699a4365d0SYoshinobu Inoue 	}
1709a4365d0SYoshinobu Inoue 
1719a4365d0SYoshinobu Inoue 	for (rpu = (struct rr_pco_use *)(rpm + 1),
1729a4365d0SYoshinobu Inoue 	     rpulim = (struct rr_pco_use *)((char *)rpm + len);
1739a4365d0SYoshinobu Inoue 	     rpu < rpulim;
1749a4365d0SYoshinobu Inoue 	     rpu += 1) {
1759a4365d0SYoshinobu Inoue 		/* init in6_rrenumreq fields */
1769a4365d0SYoshinobu Inoue 		irr->irr_u_uselen = rpu->rpu_uselen;
1779a4365d0SYoshinobu Inoue 		irr->irr_u_keeplen = rpu->rpu_keeplen;
1789a4365d0SYoshinobu Inoue 		irr->irr_raf_mask_onlink =
1796f74a8c7SWarner Losh 			!!(rpu->rpu_ramask & ICMP6_RR_PCOUSE_RAFLAGS_ONLINK);
1809a4365d0SYoshinobu Inoue 		irr->irr_raf_mask_auto =
1816f74a8c7SWarner Losh 			!!(rpu->rpu_ramask & ICMP6_RR_PCOUSE_RAFLAGS_AUTO);
18233841545SHajimu UMEMOTO 		irr->irr_vltime = ntohl(rpu->rpu_vltime);
18333841545SHajimu UMEMOTO 		irr->irr_pltime = ntohl(rpu->rpu_pltime);
1849a4365d0SYoshinobu Inoue 		irr->irr_raf_onlink =
18533841545SHajimu UMEMOTO 			(rpu->rpu_raflags & ICMP6_RR_PCOUSE_RAFLAGS_ONLINK) == 0 ? 0 : 1;
1869a4365d0SYoshinobu Inoue 		irr->irr_raf_auto =
18733841545SHajimu UMEMOTO 			(rpu->rpu_raflags & ICMP6_RR_PCOUSE_RAFLAGS_AUTO) == 0 ? 0 : 1;
1889a4365d0SYoshinobu Inoue 		irr->irr_rrf_decrvalid =
18933841545SHajimu UMEMOTO 			(rpu->rpu_flags & ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME) == 0 ? 0 : 1;
1909a4365d0SYoshinobu Inoue 		irr->irr_rrf_decrprefd =
19133841545SHajimu UMEMOTO 			(rpu->rpu_flags & ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME) == 0 ? 0 : 1;
1929a4365d0SYoshinobu Inoue 		irr->irr_useprefix.sin6_len = sizeof(irr->irr_useprefix);
1939a4365d0SYoshinobu Inoue 		irr->irr_useprefix.sin6_family = AF_INET6;
1949a4365d0SYoshinobu Inoue 		irr->irr_useprefix.sin6_addr = rpu->rpu_prefix;
1959a4365d0SYoshinobu Inoue 
1969a4365d0SYoshinobu Inoue 		if (ioctl(s, rrcmd2pco[rpm->rpm_code], (caddr_t)irr) < 0 &&
1979a4365d0SYoshinobu Inoue 		    errno != EADDRNOTAVAIL)
1981533bed0SHajimu UMEMOTO 			syslog(LOG_ERR, "<%s> ioctl: %s", __func__,
1999a4365d0SYoshinobu Inoue 			       strerror(errno));
20033841545SHajimu UMEMOTO 
20133841545SHajimu UMEMOTO 		/* very adhoc: should be rewritten */
20233841545SHajimu UMEMOTO 		if (rpm->rpm_code == RPM_PCO_CHANGE &&
20333841545SHajimu UMEMOTO 		    IN6_ARE_ADDR_EQUAL(&rpm->rpm_prefix, &rpu->rpu_prefix) &&
20433841545SHajimu UMEMOTO 		    rpm->rpm_matchlen == rpu->rpu_uselen &&
20533841545SHajimu UMEMOTO 		    rpu->rpu_uselen == rpu->rpu_keeplen) {
20633841545SHajimu UMEMOTO 			if ((rai = if_indextorainfo(ifindex)) == NULL)
20733841545SHajimu UMEMOTO 				continue; /* non-advertising IF */
20833841545SHajimu UMEMOTO 
20933841545SHajimu UMEMOTO 			for (pp = rai->prefix.next; pp != &rai->prefix;
21033841545SHajimu UMEMOTO 			     pp = pp->next) {
21133841545SHajimu UMEMOTO 				struct timeval now;
21233841545SHajimu UMEMOTO 
21333841545SHajimu UMEMOTO 				if (prefix_match(&pp->prefix, pp->prefixlen,
21433841545SHajimu UMEMOTO 						 &rpm->rpm_prefix,
21533841545SHajimu UMEMOTO 						 rpm->rpm_matchlen)) {
21633841545SHajimu UMEMOTO 					/* change parameters */
21733841545SHajimu UMEMOTO 					pp->validlifetime = ntohl(rpu->rpu_vltime);
21833841545SHajimu UMEMOTO 					pp->preflifetime = ntohl(rpu->rpu_pltime);
21933841545SHajimu UMEMOTO 					if (irr->irr_rrf_decrvalid) {
22033841545SHajimu UMEMOTO 						gettimeofday(&now, 0);
22133841545SHajimu UMEMOTO 						pp->vltimeexpire =
22233841545SHajimu UMEMOTO 							now.tv_sec + pp->validlifetime;
22333841545SHajimu UMEMOTO 					} else
22433841545SHajimu UMEMOTO 						pp->vltimeexpire = 0;
22533841545SHajimu UMEMOTO 					if (irr->irr_rrf_decrprefd) {
22633841545SHajimu UMEMOTO 						gettimeofday(&now, 0);
22733841545SHajimu UMEMOTO 						pp->pltimeexpire =
22833841545SHajimu UMEMOTO 							now.tv_sec + pp->preflifetime;
22933841545SHajimu UMEMOTO 					} else
23033841545SHajimu UMEMOTO 						pp->pltimeexpire = 0;
23133841545SHajimu UMEMOTO 				}
23233841545SHajimu UMEMOTO 			}
23333841545SHajimu UMEMOTO 		}
2349a4365d0SYoshinobu Inoue 	}
2359a4365d0SYoshinobu Inoue }
2369a4365d0SYoshinobu Inoue 
2379a4365d0SYoshinobu Inoue /*
2389a4365d0SYoshinobu Inoue  * process a Prefix Control Operation(PCO).
2399a4365d0SYoshinobu Inoue  * return 0 on success, 1 on failure
2409a4365d0SYoshinobu Inoue  */
2419a4365d0SYoshinobu Inoue static int
2429a4365d0SYoshinobu Inoue do_pco(struct icmp6_router_renum *rr, int len, struct rr_pco_match *rpm)
2439a4365d0SYoshinobu Inoue {
2449a4365d0SYoshinobu Inoue 	int ifindex = 0;
2459a4365d0SYoshinobu Inoue 	struct in6_rrenumreq irr;
2469a4365d0SYoshinobu Inoue 
247c88f8102SBruce Evans 	if ((rr_pco_check(len, rpm) != 0))
2489a4365d0SYoshinobu Inoue 		return 1;
2499a4365d0SYoshinobu Inoue 
250b26e03e9SKris Kennaway 	if (s == -1 && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
2511533bed0SHajimu UMEMOTO 		syslog(LOG_ERR, "<%s> socket: %s", __func__,
252b26e03e9SKris Kennaway 		       strerror(errno));
253b26e03e9SKris Kennaway 		exit(1);
254b26e03e9SKris Kennaway 	}
255b26e03e9SKris Kennaway 
2569a4365d0SYoshinobu Inoue 	memset(&irr, 0, sizeof(irr));
2579a4365d0SYoshinobu Inoue 	irr.irr_origin = PR_ORIG_RR;
2589a4365d0SYoshinobu Inoue 	irr.irr_m_len = rpm->rpm_matchlen;
2599a4365d0SYoshinobu Inoue 	irr.irr_m_minlen = rpm->rpm_minlen;
2609a4365d0SYoshinobu Inoue 	irr.irr_m_maxlen = rpm->rpm_maxlen;
2619a4365d0SYoshinobu Inoue 	irr.irr_matchprefix.sin6_len = sizeof(irr.irr_matchprefix);
2629a4365d0SYoshinobu Inoue 	irr.irr_matchprefix.sin6_family = AF_INET6;
2639a4365d0SYoshinobu Inoue 	irr.irr_matchprefix.sin6_addr = rpm->rpm_prefix;
2649a4365d0SYoshinobu Inoue 
2659a4365d0SYoshinobu Inoue 	while (if_indextoname(++ifindex, irr.irr_name)) {
2669a4365d0SYoshinobu Inoue 		/*
2679a4365d0SYoshinobu Inoue 		 * if ICMP6_RR_FLAGS_FORCEAPPLY(A flag) is 0 and IFF_UP is off,
2689a4365d0SYoshinobu Inoue 		 * the interface is not applied
2699a4365d0SYoshinobu Inoue 		 */
2709a4365d0SYoshinobu Inoue 		if ((rr->rr_flags & ICMP6_RR_FLAGS_FORCEAPPLY) == 0 &&
2719a4365d0SYoshinobu Inoue 		    (iflist[ifindex]->ifm_flags & IFF_UP) == 0)
2729a4365d0SYoshinobu Inoue 			continue;
2739a4365d0SYoshinobu Inoue 		/* TODO: interface scope check */
27433841545SHajimu UMEMOTO 		do_use_prefix(len, rpm, &irr, ifindex);
2759a4365d0SYoshinobu Inoue 	}
2769a4365d0SYoshinobu Inoue 	if (errno == ENXIO)
2779a4365d0SYoshinobu Inoue 		return 0;
2789a4365d0SYoshinobu Inoue 	else if (errno) {
2791533bed0SHajimu UMEMOTO 		syslog(LOG_ERR, "<%s> if_indextoname: %s", __func__,
2809a4365d0SYoshinobu Inoue 		       strerror(errno));
2819a4365d0SYoshinobu Inoue 		return 1;
2829a4365d0SYoshinobu Inoue 	}
2839a4365d0SYoshinobu Inoue 	return 0;
2849a4365d0SYoshinobu Inoue }
2859a4365d0SYoshinobu Inoue 
2869a4365d0SYoshinobu Inoue /*
2879a4365d0SYoshinobu Inoue  * call do_pco() for each Prefix Control Operations(PCOs) in a received
2889a4365d0SYoshinobu Inoue  * Router Renumbering Command packet.
2899a4365d0SYoshinobu Inoue  * return 0 on success, 1 on failure
2909a4365d0SYoshinobu Inoue  */
2919a4365d0SYoshinobu Inoue static int
2929a4365d0SYoshinobu Inoue do_rr(int len, struct icmp6_router_renum *rr)
2939a4365d0SYoshinobu Inoue {
2949a4365d0SYoshinobu Inoue 	struct rr_pco_match *rpm;
2959a4365d0SYoshinobu Inoue 	char *cp, *lim;
2969a4365d0SYoshinobu Inoue 
2979a4365d0SYoshinobu Inoue 	lim = (char *)rr + len;
2989a4365d0SYoshinobu Inoue 	cp = (char *)(rr + 1);
2999a4365d0SYoshinobu Inoue 	len -= sizeof(struct icmp6_router_renum);
3009a4365d0SYoshinobu Inoue 
3019a4365d0SYoshinobu Inoue 	/* get iflist block from kernel again, to get up-to-date information */
3029a4365d0SYoshinobu Inoue 	init_iflist();
3039a4365d0SYoshinobu Inoue 
3049a4365d0SYoshinobu Inoue 	while (cp < lim) {
3059a4365d0SYoshinobu Inoue 		int rpmlen;
3069a4365d0SYoshinobu Inoue 
3079a4365d0SYoshinobu Inoue 		rpm = (struct rr_pco_match *)cp;
3089a4365d0SYoshinobu Inoue 		if (len < sizeof(struct rr_pco_match)) {
3099a4365d0SYoshinobu Inoue 		    tooshort:
3109a4365d0SYoshinobu Inoue 			syslog(LOG_ERR, "<%s> pkt too short. left len = %d. "
3111533bed0SHajimu UMEMOTO 			       "gabage at end of pkt?", __func__, len);
3129a4365d0SYoshinobu Inoue 			return 1;
3139a4365d0SYoshinobu Inoue 		}
3149a4365d0SYoshinobu Inoue 		rpmlen = rpm->rpm_len << 3;
3159a4365d0SYoshinobu Inoue 		if (len < rpmlen)
3169a4365d0SYoshinobu Inoue 			goto tooshort;
3179a4365d0SYoshinobu Inoue 
3189a4365d0SYoshinobu Inoue 		if (do_pco(rr, rpmlen, rpm)) {
3191533bed0SHajimu UMEMOTO 			syslog(LOG_WARNING, "<%s> invalid PCO", __func__);
3209a4365d0SYoshinobu Inoue 			goto next;
3219a4365d0SYoshinobu Inoue 		}
3229a4365d0SYoshinobu Inoue 
3239a4365d0SYoshinobu Inoue 	    next:
3249a4365d0SYoshinobu Inoue 		cp += rpmlen;
3259a4365d0SYoshinobu Inoue 		len -= rpmlen;
3269a4365d0SYoshinobu Inoue 	}
327b26e03e9SKris Kennaway 
3289a4365d0SYoshinobu Inoue 	return 0;
3299a4365d0SYoshinobu Inoue }
3309a4365d0SYoshinobu Inoue 
3319a4365d0SYoshinobu Inoue /*
3329a4365d0SYoshinobu Inoue  * check validity of a router renumbering command packet
3339a4365d0SYoshinobu Inoue  * return 0 on success, 1 on failure
3349a4365d0SYoshinobu Inoue  */
3359a4365d0SYoshinobu Inoue static int
3369a4365d0SYoshinobu Inoue rr_command_check(int len, struct icmp6_router_renum *rr, struct in6_addr *from,
3379a4365d0SYoshinobu Inoue 		 struct in6_addr *dst)
3389a4365d0SYoshinobu Inoue {
3399a4365d0SYoshinobu Inoue 	u_char ntopbuf[INET6_ADDRSTRLEN];
3409a4365d0SYoshinobu Inoue 
3419a4365d0SYoshinobu Inoue 	/* omit rr minimal length check. hope kernel have done it. */
3429a4365d0SYoshinobu Inoue 	/* rr_command length check */
3439a4365d0SYoshinobu Inoue 	if (len < (sizeof(struct icmp6_router_renum) +
3449a4365d0SYoshinobu Inoue 		   sizeof(struct rr_pco_match))) {
3459a4365d0SYoshinobu Inoue 		syslog(LOG_ERR,	"<%s> rr_command len %d is too short",
3461533bed0SHajimu UMEMOTO 		       __func__, len);
3479a4365d0SYoshinobu Inoue 		return 1;
3489a4365d0SYoshinobu Inoue 	}
3499a4365d0SYoshinobu Inoue 
3509a4365d0SYoshinobu Inoue 	/* destination check. only for multicast. omit unicast check. */
3519a4365d0SYoshinobu Inoue 	if (IN6_IS_ADDR_MULTICAST(dst) && !IN6_IS_ADDR_MC_LINKLOCAL(dst) &&
3529a4365d0SYoshinobu Inoue 	    !IN6_IS_ADDR_MC_SITELOCAL(dst)) {
3539a4365d0SYoshinobu Inoue 		syslog(LOG_ERR,	"<%s> dst mcast addr %s is illegal",
3541533bed0SHajimu UMEMOTO 		       __func__,
3559a4365d0SYoshinobu Inoue 		       inet_ntop(AF_INET6, dst, ntopbuf, INET6_ADDRSTRLEN));
3569a4365d0SYoshinobu Inoue 		return 1;
3579a4365d0SYoshinobu Inoue 	}
3589a4365d0SYoshinobu Inoue 
3599a4365d0SYoshinobu Inoue 	/* seqnum and segnum check */
3609a4365d0SYoshinobu Inoue 	if (rro.rro_seqnum > rr->rr_seqnum) {
3619a4365d0SYoshinobu Inoue 		syslog(LOG_WARNING,
3629a4365d0SYoshinobu Inoue 		       "<%s> rcvd old seqnum %d from %s",
3631533bed0SHajimu UMEMOTO 		       __func__, (u_int32_t)ntohl(rr->rr_seqnum),
3649a4365d0SYoshinobu Inoue 		       inet_ntop(AF_INET6, from, ntopbuf, INET6_ADDRSTRLEN));
3659a4365d0SYoshinobu Inoue 		return 1;
3669a4365d0SYoshinobu Inoue 	}
3679a4365d0SYoshinobu Inoue 	if (rro.rro_seqnum == rr->rr_seqnum &&
3689a4365d0SYoshinobu Inoue 	    (rr->rr_flags & ICMP6_RR_FLAGS_TEST) == 0 &&
3699a4365d0SYoshinobu Inoue 	    RR_ISSET_SEGNUM(rro.rro_segnum_bits, rr->rr_segnum)) {
3709a4365d0SYoshinobu Inoue 		if ((rr->rr_flags & ICMP6_RR_FLAGS_REQRESULT) != 0)
3719a4365d0SYoshinobu Inoue 			syslog(LOG_WARNING,
3729a4365d0SYoshinobu Inoue 			       "<%s> rcvd duped segnum %d from %s",
3731533bed0SHajimu UMEMOTO 			       __func__, rr->rr_segnum,
3749a4365d0SYoshinobu Inoue 			       inet_ntop(AF_INET6, from, ntopbuf,
3759a4365d0SYoshinobu Inoue 					 INET6_ADDRSTRLEN));
3769a4365d0SYoshinobu Inoue 		return 0;
3779a4365d0SYoshinobu Inoue 	}
3789a4365d0SYoshinobu Inoue 
3799a4365d0SYoshinobu Inoue 	/* update seqnum */
3809a4365d0SYoshinobu Inoue 	if (rro.rro_seqnum != rr->rr_seqnum) {
3819a4365d0SYoshinobu Inoue 		/* then must be "<" */
3829a4365d0SYoshinobu Inoue 
3839a4365d0SYoshinobu Inoue 		/* init rro_segnum_bits */
3849a4365d0SYoshinobu Inoue 		memset(rro.rro_segnum_bits, 0,
3859a4365d0SYoshinobu Inoue 		       sizeof(rro.rro_segnum_bits));
3869a4365d0SYoshinobu Inoue 	}
3879a4365d0SYoshinobu Inoue 	rro.rro_seqnum = rr->rr_seqnum;
3889a4365d0SYoshinobu Inoue 
3899a4365d0SYoshinobu Inoue 	return 0;
3909a4365d0SYoshinobu Inoue }
3919a4365d0SYoshinobu Inoue 
3929a4365d0SYoshinobu Inoue static void
3939a4365d0SYoshinobu Inoue rr_command_input(int len, struct icmp6_router_renum *rr,
3949a4365d0SYoshinobu Inoue 		 struct in6_addr *from, struct in6_addr *dst)
3959a4365d0SYoshinobu Inoue {
3969a4365d0SYoshinobu Inoue 	/* rr_command validity check */
3979a4365d0SYoshinobu Inoue 	if (rr_command_check(len, rr, from, dst))
3989a4365d0SYoshinobu Inoue 		goto failed;
3999a4365d0SYoshinobu Inoue 	if ((rr->rr_flags & (ICMP6_RR_FLAGS_TEST|ICMP6_RR_FLAGS_REQRESULT)) ==
4009a4365d0SYoshinobu Inoue 	    ICMP6_RR_FLAGS_TEST)
4019a4365d0SYoshinobu Inoue 		return;
4029a4365d0SYoshinobu Inoue 
4039a4365d0SYoshinobu Inoue 	/* do router renumbering */
4049a4365d0SYoshinobu Inoue 	if (do_rr(len, rr)) {
4059a4365d0SYoshinobu Inoue 		goto failed;
4069a4365d0SYoshinobu Inoue 	}
4079a4365d0SYoshinobu Inoue 
4089a4365d0SYoshinobu Inoue 	/* update segnum */
4099a4365d0SYoshinobu Inoue 	RR_SET_SEGNUM(rro.rro_segnum_bits, rr->rr_segnum);
4109a4365d0SYoshinobu Inoue 
4119a4365d0SYoshinobu Inoue 	return;
4129a4365d0SYoshinobu Inoue 
4139a4365d0SYoshinobu Inoue     failed:
4141533bed0SHajimu UMEMOTO 	syslog(LOG_ERR, "<%s> received RR was invalid", __func__);
4159a4365d0SYoshinobu Inoue 	return;
4169a4365d0SYoshinobu Inoue }
4179a4365d0SYoshinobu Inoue 
4189a4365d0SYoshinobu Inoue void
4199a4365d0SYoshinobu Inoue rr_input(int len, struct icmp6_router_renum *rr, struct in6_pktinfo *pi,
4209a4365d0SYoshinobu Inoue 	 struct sockaddr_in6 *from, struct in6_addr *dst)
4219a4365d0SYoshinobu Inoue {
4229a4365d0SYoshinobu Inoue 	u_char ntopbuf[2][INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
4239a4365d0SYoshinobu Inoue 
4249a4365d0SYoshinobu Inoue 	syslog(LOG_DEBUG,
4259a4365d0SYoshinobu Inoue 	       "<%s> RR received from %s to %s on %s",
4261533bed0SHajimu UMEMOTO 	       __func__,
4279a4365d0SYoshinobu Inoue 	       inet_ntop(AF_INET6, &from->sin6_addr,
4289a4365d0SYoshinobu Inoue 			 ntopbuf[0], INET6_ADDRSTRLEN),
4299a4365d0SYoshinobu Inoue 	       inet_ntop(AF_INET6, &dst, ntopbuf[1], INET6_ADDRSTRLEN),
4309a4365d0SYoshinobu Inoue 	       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
4319a4365d0SYoshinobu Inoue 
43233841545SHajimu UMEMOTO 	/* packet validation based on Section 4.1 of RFC2894 */
43333841545SHajimu UMEMOTO 	if (len < sizeof(struct icmp6_router_renum)) {
43433841545SHajimu UMEMOTO 		syslog(LOG_NOTICE,
43533841545SHajimu UMEMOTO 		       "<%s>: RR short message (size %d) from %s to %s on %s",
4361533bed0SHajimu UMEMOTO 		       __func__, len,
43733841545SHajimu UMEMOTO 		       inet_ntop(AF_INET6, &from->sin6_addr,
43833841545SHajimu UMEMOTO 				 ntopbuf[0], INET6_ADDRSTRLEN),
43933841545SHajimu UMEMOTO 		       inet_ntop(AF_INET6, &dst, ntopbuf[1], INET6_ADDRSTRLEN),
44033841545SHajimu UMEMOTO 		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
44133841545SHajimu UMEMOTO 		return;
44233841545SHajimu UMEMOTO 	}
4439a4365d0SYoshinobu Inoue 
44433841545SHajimu UMEMOTO 	/*
44533841545SHajimu UMEMOTO 	 * If the IPv6 destination address is neither an All Routers multicast
44633841545SHajimu UMEMOTO 	 * address [AARCH] nor one of the receiving router's unicast addresses,
44733841545SHajimu UMEMOTO 	 * the message MUST be discarded and SHOULD be logged to network
44833841545SHajimu UMEMOTO 	 * management.
44933841545SHajimu UMEMOTO 	 * We rely on the kernel input routine for unicast addresses, and thus
45033841545SHajimu UMEMOTO 	 * check multicast destinations only.
45133841545SHajimu UMEMOTO 	 */
45233841545SHajimu UMEMOTO 	if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) &&
45333841545SHajimu UMEMOTO 	    !IN6_ARE_ADDR_EQUAL(&in6a_site_allrouters, &pi->ipi6_addr)) {
45433841545SHajimu UMEMOTO 		syslog(LOG_NOTICE,
45533841545SHajimu UMEMOTO 		       "<%s>: RR message with invalid destination (%s) "
45633841545SHajimu UMEMOTO 		       "from %s on %s",
4571533bed0SHajimu UMEMOTO 		       __func__,
45833841545SHajimu UMEMOTO 		       inet_ntop(AF_INET6, &dst, ntopbuf[0], INET6_ADDRSTRLEN),
45933841545SHajimu UMEMOTO 		       inet_ntop(AF_INET6, &from->sin6_addr,
46033841545SHajimu UMEMOTO 				 ntopbuf[1], INET6_ADDRSTRLEN),
46133841545SHajimu UMEMOTO 		       if_indextoname(pi->ipi6_ifindex, ifnamebuf));
46233841545SHajimu UMEMOTO 		return;
46333841545SHajimu UMEMOTO 	}
46433841545SHajimu UMEMOTO 
46533841545SHajimu UMEMOTO 	rr_rcvifindex = pi->ipi6_ifindex;
4669a4365d0SYoshinobu Inoue 
4679a4365d0SYoshinobu Inoue 	switch (rr->rr_code) {
4689a4365d0SYoshinobu Inoue 	case ICMP6_ROUTER_RENUMBERING_COMMAND:
4699a4365d0SYoshinobu Inoue 		rr_command_input(len, rr, &from->sin6_addr, dst);
4709a4365d0SYoshinobu Inoue 		/* TODO: send reply msg */
4719a4365d0SYoshinobu Inoue 		break;
4729a4365d0SYoshinobu Inoue 	case ICMP6_ROUTER_RENUMBERING_RESULT:
4739a4365d0SYoshinobu Inoue 		/* RESULT will be processed by rrenumd */
4749a4365d0SYoshinobu Inoue 		break;
4759a4365d0SYoshinobu Inoue 	case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
4769a4365d0SYoshinobu Inoue 		/* TODO: sequence number reset */
4779a4365d0SYoshinobu Inoue 		break;
4789a4365d0SYoshinobu Inoue 	default:
4799a4365d0SYoshinobu Inoue 		syslog(LOG_ERR,	"<%s> received unknown code %d",
4801533bed0SHajimu UMEMOTO 		       __func__, rr->rr_code);
4819a4365d0SYoshinobu Inoue 		break;
4829a4365d0SYoshinobu Inoue 
4839a4365d0SYoshinobu Inoue 	}
4849a4365d0SYoshinobu Inoue 
4859a4365d0SYoshinobu Inoue 	return;
4869a4365d0SYoshinobu Inoue }
487