2 /* $KAME: rrenum.c,v 1.12 2002/06/10 19:59:47 itojun Exp $ */
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/types.h>
33 #include <sys/param.h>
34 #include <sys/ioctl.h>
35 #include <sys/socket.h>
36 #include <sys/sysctl.h>
39 #include <net/if_dl.h>
40 #include <net/if_var.h>
41 #include <net/route.h>
42 #include <netinet/in.h>
43 #include <netinet/in_var.h>
44 #include <netinet/icmp6.h>
46 #include <arpa/inet.h>
57 #define RR_ISSET_SEGNUM(segnum_bits, segnum) \
58 ((((segnum_bits)[(segnum) >> 5]) & (1 << ((segnum) & 31))) != 0)
59 #define RR_SET_SEGNUM(segnum_bits, segnum) \
60 (((segnum_bits)[(segnum) >> 5]) |= (1 << ((segnum) & 31)))
64 u_long rro_segnum_bits[8];
67 static struct rr_operation rro;
68 static int rr_rcvifindex;
69 static int rrcmd2pco[RPM_PCO_MAX] = {
78 * Check validity of a Prefix Control Operation(PCO).
79 * return 0 on success, 1 on failure.
82 rr_pco_check(int len, struct rr_pco_match *rpm)
84 struct rr_pco_use *rpu, *rpulim;
87 /* rpm->rpm_len must be (4N * 3) as router-renum-05.txt */
88 if ((rpm->rpm_len - 3) < 0 || /* must be at least 3 */
89 (rpm->rpm_len - 3) & 0x3) { /* must be multiple of 4 */
90 syslog(LOG_WARNING, "<%s> rpm_len %d is not 4N * 3",
91 __func__, rpm->rpm_len);
94 /* rpm->rpm_code must be valid value */
95 switch (rpm->rpm_code) {
98 case RPM_PCO_SETGLOBAL:
101 syslog(LOG_WARNING, "<%s> unknown rpm_code %d", __func__,
105 /* rpm->rpm_matchlen must be 0 to 128 inclusive */
106 if (rpm->rpm_matchlen > 128) {
107 syslog(LOG_WARNING, "<%s> rpm_matchlen %d is over 128",
108 __func__, rpm->rpm_matchlen);
113 * rpu->rpu_uselen, rpu->rpu_keeplen, and sum of them must be
114 * between 0 and 128 inclusive
116 for (rpu = (struct rr_pco_use *)(rpm + 1),
117 rpulim = (struct rr_pco_use *)((char *)rpm + len);
120 checklen = rpu->rpu_uselen;
121 checklen += rpu->rpu_keeplen;
123 * omit these check, because either of rpu_uselen
124 * and rpu_keeplen is unsigned char
125 * (128 > rpu_uselen > 0)
126 * (128 > rpu_keeplen > 0)
127 * (rpu_uselen + rpu_keeplen > 0)
129 if (checklen > 128) {
130 syslog(LOG_WARNING, "<%s> sum of rpu_uselen %d and"
131 " rpu_keeplen %d is %d(over 128)",
132 __func__, rpu->rpu_uselen, rpu->rpu_keeplen,
133 rpu->rpu_uselen + rpu->rpu_keeplen);
141 do_use_prefix(int len, struct rr_pco_match *rpm,
142 struct in6_rrenumreq *irr, int ifindex)
144 struct rr_pco_use *rpu, *rpulim;
149 rpu = (struct rr_pco_use *)(rpm + 1);
150 rpulim = (struct rr_pco_use *)((char *)rpm + len);
152 if (rpu == rpulim) { /* no use prefix */
153 if (rpm->rpm_code == RPM_PCO_ADD)
156 irr->irr_u_uselen = 0;
157 irr->irr_u_keeplen = 0;
158 irr->irr_raf_mask_onlink = 0;
159 irr->irr_raf_mask_auto = 0;
162 memset(&irr->irr_flags, 0, sizeof(irr->irr_flags));
163 irr->irr_useprefix.sin6_len = 0; /* let it mean, no addition */
164 irr->irr_useprefix.sin6_family = 0;
165 irr->irr_useprefix.sin6_addr = in6addr_any;
166 if (ioctl(s, rrcmd2pco[rpm->rpm_code], (caddr_t)irr) < 0 &&
167 errno != EADDRNOTAVAIL)
168 syslog(LOG_ERR, "<%s> ioctl: %s", __func__,
173 for (rpu = (struct rr_pco_use *)(rpm + 1),
174 rpulim = (struct rr_pco_use *)((char *)rpm + len);
177 /* init in6_rrenumreq fields */
178 irr->irr_u_uselen = rpu->rpu_uselen;
179 irr->irr_u_keeplen = rpu->rpu_keeplen;
180 irr->irr_raf_mask_onlink =
181 !!(rpu->rpu_ramask & ICMP6_RR_PCOUSE_RAFLAGS_ONLINK);
182 irr->irr_raf_mask_auto =
183 !!(rpu->rpu_ramask & ICMP6_RR_PCOUSE_RAFLAGS_AUTO);
184 irr->irr_vltime = ntohl(rpu->rpu_vltime);
185 irr->irr_pltime = ntohl(rpu->rpu_pltime);
186 irr->irr_raf_onlink =
187 (rpu->rpu_raflags & ICMP6_RR_PCOUSE_RAFLAGS_ONLINK) == 0 ?
190 (rpu->rpu_raflags & ICMP6_RR_PCOUSE_RAFLAGS_AUTO) == 0 ?
192 irr->irr_rrf_decrvalid =
193 (rpu->rpu_flags & ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME) == 0 ?
195 irr->irr_rrf_decrprefd =
196 (rpu->rpu_flags & ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME) == 0 ?
198 irr->irr_useprefix.sin6_len = sizeof(irr->irr_useprefix);
199 irr->irr_useprefix.sin6_family = AF_INET6;
200 irr->irr_useprefix.sin6_addr = rpu->rpu_prefix;
202 if (ioctl(s, rrcmd2pco[rpm->rpm_code], (caddr_t)irr) < 0 &&
203 errno != EADDRNOTAVAIL)
204 syslog(LOG_ERR, "<%s> ioctl: %s", __func__,
207 /* very adhoc: should be rewritten */
208 if (rpm->rpm_code == RPM_PCO_CHANGE &&
209 IN6_ARE_ADDR_EQUAL(&rpm->rpm_prefix, &rpu->rpu_prefix) &&
210 rpm->rpm_matchlen == rpu->rpu_uselen &&
211 rpu->rpu_uselen == rpu->rpu_keeplen) {
212 ifi = if_indextoifinfo(ifindex);
213 if (ifi == NULL || ifi->ifi_rainfo == NULL)
214 continue; /* non-advertising IF */
215 rai = ifi->ifi_rainfo;
217 TAILQ_FOREACH(pfx, &rai->rai_prefix, pfx_next) {
220 if (prefix_match(&pfx->pfx_prefix,
221 pfx->pfx_prefixlen, &rpm->rpm_prefix,
222 rpm->rpm_matchlen)) {
223 /* change parameters */
224 pfx->pfx_validlifetime =
225 ntohl(rpu->rpu_vltime);
226 pfx->pfx_preflifetime =
227 ntohl(rpu->rpu_pltime);
228 if (irr->irr_rrf_decrvalid) {
229 gettimeofday(&now, 0);
230 pfx->pfx_vltimeexpire =
232 pfx->pfx_validlifetime;
234 pfx->pfx_vltimeexpire = 0;
235 if (irr->irr_rrf_decrprefd) {
236 gettimeofday(&now, 0);
237 pfx->pfx_pltimeexpire =
239 pfx->pfx_preflifetime;
241 pfx->pfx_pltimeexpire = 0;
249 * process a Prefix Control Operation(PCO).
250 * return 0 on success, 1 on failure
253 do_pco(struct icmp6_router_renum *rr, int len, struct rr_pco_match *rpm)
256 struct in6_rrenumreq irr;
259 if ((rr_pco_check(len, rpm) != 0))
262 if (s == -1 && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
263 syslog(LOG_ERR, "<%s> socket: %s", __func__,
268 memset(&irr, 0, sizeof(irr));
269 irr.irr_origin = PR_ORIG_RR;
270 irr.irr_m_len = rpm->rpm_matchlen;
271 irr.irr_m_minlen = rpm->rpm_minlen;
272 irr.irr_m_maxlen = rpm->rpm_maxlen;
273 irr.irr_matchprefix.sin6_len = sizeof(irr.irr_matchprefix);
274 irr.irr_matchprefix.sin6_family = AF_INET6;
275 irr.irr_matchprefix.sin6_addr = rpm->rpm_prefix;
277 while (if_indextoname(++ifindex, irr.irr_name)) {
278 ifi = if_indextoifinfo(ifindex);
280 syslog(LOG_ERR, "<%s> ifindex not found.",
285 * if ICMP6_RR_FLAGS_FORCEAPPLY(A flag) is 0 and
286 * IFF_UP is off, the interface is not applied
288 if ((rr->rr_flags & ICMP6_RR_FLAGS_FORCEAPPLY) == 0 &&
289 (ifi->ifi_flags & IFF_UP) == 0)
291 /* TODO: interface scope check */
292 do_use_prefix(len, rpm, &irr, ifindex);
297 syslog(LOG_ERR, "<%s> if_indextoname: %s", __func__,
305 * call do_pco() for each Prefix Control Operations(PCOs) in a received
306 * Router Renumbering Command packet.
307 * return 0 on success, 1 on failure
310 do_rr(int len, struct icmp6_router_renum *rr)
312 struct rr_pco_match *rpm;
315 lim = (char *)rr + len;
316 cp = (char *)(rr + 1);
317 len -= sizeof(struct icmp6_router_renum);
319 update_ifinfo(&ifilist, UPDATE_IFINFO_ALL);
324 rpm = (struct rr_pco_match *)cp;
325 if ((size_t)len < sizeof(struct rr_pco_match)) {
327 syslog(LOG_ERR, "<%s> pkt too short. left len = %d. "
328 "gabage at end of pkt?", __func__, len);
331 rpmlen = rpm->rpm_len << 3;
335 if (do_pco(rr, rpmlen, rpm)) {
336 syslog(LOG_WARNING, "<%s> invalid PCO", __func__);
349 * check validity of a router renumbering command packet
350 * return 0 on success, 1 on failure
353 rr_command_check(int len, struct icmp6_router_renum *rr, struct in6_addr *from,
354 struct in6_addr *dst)
356 u_char ntopbuf[INET6_ADDRSTRLEN];
358 /* omit rr minimal length check. hope kernel have done it. */
359 /* rr_command length check */
360 if ((size_t)len < (sizeof(struct icmp6_router_renum) +
361 sizeof(struct rr_pco_match))) {
362 syslog(LOG_ERR, "<%s> rr_command len %d is too short",
367 /* destination check. only for multicast. omit unicast check. */
368 if (IN6_IS_ADDR_MULTICAST(dst) && !IN6_IS_ADDR_MC_LINKLOCAL(dst) &&
369 !IN6_IS_ADDR_MC_SITELOCAL(dst)) {
370 syslog(LOG_ERR, "<%s> dst mcast addr %s is illegal",
372 inet_ntop(AF_INET6, dst, ntopbuf, sizeof(ntopbuf)));
376 /* seqnum and segnum check */
377 if (rro.rro_seqnum > rr->rr_seqnum) {
379 "<%s> rcvd old seqnum %d from %s",
380 __func__, (u_int32_t)ntohl(rr->rr_seqnum),
381 inet_ntop(AF_INET6, from, ntopbuf, sizeof(ntopbuf)));
384 if (rro.rro_seqnum == rr->rr_seqnum &&
385 (rr->rr_flags & ICMP6_RR_FLAGS_TEST) == 0 &&
386 RR_ISSET_SEGNUM(rro.rro_segnum_bits, rr->rr_segnum)) {
387 if ((rr->rr_flags & ICMP6_RR_FLAGS_REQRESULT) != 0)
389 "<%s> rcvd duped segnum %d from %s",
390 __func__, rr->rr_segnum, inet_ntop(AF_INET6, from,
391 ntopbuf, sizeof(ntopbuf)));
396 if (rro.rro_seqnum != rr->rr_seqnum) {
397 /* then must be "<" */
399 /* init rro_segnum_bits */
400 memset(rro.rro_segnum_bits, 0,
401 sizeof(rro.rro_segnum_bits));
403 rro.rro_seqnum = rr->rr_seqnum;
409 rr_command_input(int len, struct icmp6_router_renum *rr,
410 struct in6_addr *from, struct in6_addr *dst)
412 /* rr_command validity check */
413 if (rr_command_check(len, rr, from, dst))
415 if ((rr->rr_flags & (ICMP6_RR_FLAGS_TEST|ICMP6_RR_FLAGS_REQRESULT)) ==
419 /* do router renumbering */
424 RR_SET_SEGNUM(rro.rro_segnum_bits, rr->rr_segnum);
429 syslog(LOG_ERR, "<%s> received RR was invalid", __func__);
434 rr_input(int len, struct icmp6_router_renum *rr, struct in6_pktinfo *pi,
435 struct sockaddr_in6 *from, struct in6_addr *dst)
437 u_char ntopbuf[2][INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
440 "<%s> RR received from %s to %s on %s",
442 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf[0] ,sizeof(ntopbuf[0])),
443 inet_ntop(AF_INET6, &dst, ntopbuf[1], sizeof(ntopbuf[1])),
444 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
446 /* packet validation based on Section 4.1 of RFC2894 */
447 if ((size_t)len < sizeof(struct icmp6_router_renum)) {
449 "<%s>: RR short message (size %d) from %s to %s on %s",
451 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf[0],
453 inet_ntop(AF_INET6, &dst, ntopbuf[1], sizeof(ntopbuf[1])),
454 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
459 * If the IPv6 destination address is neither an All Routers multicast
460 * address [AARCH] nor one of the receiving router's unicast addresses,
461 * the message MUST be discarded and SHOULD be logged to network
463 * We rely on the kernel input routine for unicast addresses, and thus
464 * check multicast destinations only.
466 if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) && !IN6_ARE_ADDR_EQUAL(
467 &sin6_sitelocal_allrouters.sin6_addr, &pi->ipi6_addr)) {
469 "<%s>: RR message with invalid destination (%s) "
472 inet_ntop(AF_INET6, &dst, ntopbuf[0], sizeof(ntopbuf[0])),
473 inet_ntop(AF_INET6, &from->sin6_addr, ntopbuf[1],
475 if_indextoname(pi->ipi6_ifindex, ifnamebuf));
479 rr_rcvifindex = pi->ipi6_ifindex;
481 switch (rr->rr_code) {
482 case ICMP6_ROUTER_RENUMBERING_COMMAND:
483 rr_command_input(len, rr, &from->sin6_addr, dst);
484 /* TODO: send reply msg */
486 case ICMP6_ROUTER_RENUMBERING_RESULT:
487 /* RESULT will be processed by rrenumd */
489 case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
490 /* TODO: sequence number reset */
493 syslog(LOG_ERR, "<%s> received unknown code %d",
494 __func__, rr->rr_code);