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-rw-r--r--network_cmds/rtadvd.tproj/rrenum.c484
1 files changed, 484 insertions, 0 deletions
diff --git a/network_cmds/rtadvd.tproj/rrenum.c b/network_cmds/rtadvd.tproj/rrenum.c
new file mode 100644
index 0000000..ae04a55
--- /dev/null
+++ b/network_cmds/rtadvd.tproj/rrenum.c
@@ -0,0 +1,484 @@
+/* $KAME: rrenum.c,v 1.12 2002/06/10 19:59:47 itojun Exp $ */
+
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#include <sys/types.h>
+#include <sys/param.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/route.h>
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/icmp6.h>
+
+#include <arpa/inet.h>
+
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include "rtadvd.h"
+#include "rrenum.h"
+#include "if.h"
+
+#define RR_ISSET_SEGNUM(segnum_bits, segnum) \
+ ((((segnum_bits)[(segnum) >> 5]) & (1 << ((segnum) & 31))) != 0)
+#define RR_SET_SEGNUM(segnum_bits, segnum) \
+ (((segnum_bits)[(segnum) >> 5]) |= (1 << ((segnum) & 31)))
+
+struct rr_operation {
+ u_long rro_seqnum;
+ u_long rro_segnum_bits[8];
+};
+
+static struct rr_operation rro;
+static int rr_rcvifindex;
+static int rrcmd2pco[RPM_PCO_MAX] = {
+ 0,
+ SIOCAIFPREFIX_IN6,
+ SIOCCIFPREFIX_IN6,
+ SIOCSGIFPREFIX_IN6
+};
+static int s = -1;
+
+/*
+ * Check validity of a Prefix Control Operation(PCO).
+ * Return 0 on success, 1 on failure.
+ */
+static int
+rr_pco_check(int len, struct rr_pco_match *rpm)
+{
+ struct rr_pco_use *rpu, *rpulim;
+ int checklen;
+
+ /* rpm->rpm_len must be (4N * 3) as router-renum-05.txt */
+ if ((rpm->rpm_len - 3) < 0 || /* must be at least 3 */
+ (rpm->rpm_len - 3) & 0x3) { /* must be multiple of 4 */
+ errorlog("<%s> rpm_len %d is not 4N * 3",
+ __func__, rpm->rpm_len);
+ return 1;
+ }
+ /* rpm->rpm_code must be valid value */
+ switch (rpm->rpm_code) {
+ case RPM_PCO_ADD:
+ case RPM_PCO_CHANGE:
+ case RPM_PCO_SETGLOBAL:
+ break;
+ default:
+ errorlog("<%s> unknown rpm_code %d", __func__,
+ rpm->rpm_code);
+ return 1;
+ }
+ /* rpm->rpm_matchlen must be 0 to 128 inclusive */
+ if (rpm->rpm_matchlen > 128) {
+ errorlog("<%s> rpm_matchlen %d is over 128",
+ __func__, rpm->rpm_matchlen);
+ return 1;
+ }
+
+ /*
+ * rpu->rpu_uselen, rpu->rpu_keeplen, and sum of them must be
+ * between 0 and 128 inclusive
+ */
+ for (rpu = (struct rr_pco_use *)(rpm + 1),
+ rpulim = (struct rr_pco_use *)((char *)rpm + len);
+ rpu < rpulim;
+ rpu += 1) {
+ checklen = rpu->rpu_uselen;
+ checklen += rpu->rpu_keeplen;
+ /*
+ * omit these check, because either of rpu_uselen
+ * and rpu_keeplen is unsigned char
+ * (128 > rpu_uselen > 0)
+ * (128 > rpu_keeplen > 0)
+ * (rpu_uselen + rpu_keeplen > 0)
+ */
+ if (checklen > 128) {
+ errorlog("<%s> sum of rpu_uselen %d and"
+ " rpu_keeplen %d is %d(over 128)",
+ __func__, rpu->rpu_uselen,
+ rpu->rpu_keeplen,
+ rpu->rpu_uselen + rpu->rpu_keeplen);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void
+do_use_prefix(int len, struct rr_pco_match *rpm,
+ struct in6_rrenumreq *irr, int ifindex)
+{
+ struct rr_pco_use *rpu, *rpulim;
+ struct rainfo *rai;
+ struct prefix *pp;
+
+ rpu = (struct rr_pco_use *)(rpm + 1);
+ rpulim = (struct rr_pco_use *)((char *)rpm + len);
+
+ if (rpu == rpulim) { /* no use prefix */
+ if (rpm->rpm_code == RPM_PCO_ADD)
+ return;
+
+ irr->irr_u_uselen = 0;
+ irr->irr_u_keeplen = 0;
+ irr->irr_raf_mask_onlink = 0;
+ irr->irr_raf_mask_auto = 0;
+ irr->irr_vltime = 0;
+ irr->irr_pltime = 0;
+ memset(&irr->irr_flags, 0, sizeof(irr->irr_flags));
+ irr->irr_useprefix.sin6_len = 0; /* let it mean, no addition */
+ irr->irr_useprefix.sin6_family = 0;
+ irr->irr_useprefix.sin6_addr = in6addr_any;
+ if (ioctl(s, rrcmd2pco[rpm->rpm_code], (caddr_t)irr) < 0 &&
+ errno != EADDRNOTAVAIL)
+ errorlog("<%s> ioctl: %s", __func__,
+ strerror(errno));
+ return;
+ }
+
+ for (rpu = (struct rr_pco_use *)(rpm + 1),
+ rpulim = (struct rr_pco_use *)((char *)rpm + len);
+ rpu < rpulim;
+ rpu += 1) {
+ /* init in6_rrenumreq fields */
+ irr->irr_u_uselen = rpu->rpu_uselen;
+ irr->irr_u_keeplen = rpu->rpu_keeplen;
+ irr->irr_raf_mask_onlink =
+ !!(rpu->rpu_ramask & ICMP6_RR_PCOUSE_RAFLAGS_ONLINK);
+ irr->irr_raf_mask_auto =
+ !!(rpu->rpu_ramask & ICMP6_RR_PCOUSE_RAFLAGS_AUTO);
+ irr->irr_vltime = ntohl(rpu->rpu_vltime);
+ irr->irr_pltime = ntohl(rpu->rpu_pltime);
+ irr->irr_raf_onlink =
+ (rpu->rpu_raflags & ICMP6_RR_PCOUSE_RAFLAGS_ONLINK) == 0 ? 0 : 1;
+ irr->irr_raf_auto =
+ (rpu->rpu_raflags & ICMP6_RR_PCOUSE_RAFLAGS_AUTO) == 0 ? 0 : 1;
+ irr->irr_rrf_decrvalid =
+ (rpu->rpu_flags & ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME) == 0 ? 0 : 1;
+ irr->irr_rrf_decrprefd =
+ (rpu->rpu_flags & ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME) == 0 ? 0 : 1;
+ irr->irr_useprefix.sin6_len = sizeof(irr->irr_useprefix);
+ irr->irr_useprefix.sin6_family = AF_INET6;
+ irr->irr_useprefix.sin6_addr = rpu->rpu_prefix;
+
+ if (ioctl(s, rrcmd2pco[rpm->rpm_code], (caddr_t)irr) < 0 &&
+ errno != EADDRNOTAVAIL)
+ errorlog("<%s> ioctl: %s", __func__,
+ strerror(errno));
+
+ /* very adhoc: should be rewritten */
+ if (rpm->rpm_code == RPM_PCO_CHANGE &&
+ IN6_ARE_ADDR_EQUAL(&rpm->rpm_prefix, &rpu->rpu_prefix) &&
+ rpm->rpm_matchlen == rpu->rpu_uselen &&
+ rpu->rpu_uselen == rpu->rpu_keeplen) {
+ if ((rai = if_indextorainfo(ifindex)) == NULL)
+ continue; /* non-advertising IF */
+
+ for (pp = rai->prefix.next; pp != &rai->prefix;
+ pp = pp->next) {
+ struct timeval now;
+
+ if (prefix_match(&pp->prefix, pp->prefixlen,
+ &rpm->rpm_prefix,
+ rpm->rpm_matchlen)) {
+ /* change parameters */
+ pp->validlifetime = ntohl(rpu->rpu_vltime);
+ pp->preflifetime = ntohl(rpu->rpu_pltime);
+ if (irr->irr_rrf_decrvalid) {
+ gettimeofday(&now, 0);
+ pp->vltimeexpire =
+ now.tv_sec + pp->validlifetime;
+ } else
+ pp->vltimeexpire = 0;
+ if (irr->irr_rrf_decrprefd) {
+ gettimeofday(&now, 0);
+ pp->pltimeexpire =
+ now.tv_sec + pp->preflifetime;
+ } else
+ pp->pltimeexpire = 0;
+ }
+ }
+ }
+ }
+}
+
+/*
+ * process a Prefix Control Operation(PCO).
+ * return 0 on success, 1 on failure
+ */
+static int
+do_pco(struct icmp6_router_renum *rr, int len, struct rr_pco_match *rpm)
+{
+ int ifindex = 0;
+ struct in6_rrenumreq irr;
+
+ if ((rr_pco_check(len, rpm) != 0))
+ return 1;
+
+ if (s == -1 && (s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
+ errorlog("<%s> socket: %s", __func__,
+ strerror(errno));
+ exit(1);
+ }
+
+ memset(&irr, 0, sizeof(irr));
+ irr.irr_origin = PR_ORIG_RR;
+ irr.irr_m_len = rpm->rpm_matchlen;
+ irr.irr_m_minlen = rpm->rpm_minlen;
+ irr.irr_m_maxlen = rpm->rpm_maxlen;
+ irr.irr_matchprefix.sin6_len = sizeof(irr.irr_matchprefix);
+ irr.irr_matchprefix.sin6_family = AF_INET6;
+ irr.irr_matchprefix.sin6_addr = rpm->rpm_prefix;
+
+ while (if_indextoname(++ifindex, irr.irr_name)) {
+ struct if_msghdr * ifm = get_interface_entry(ifindex);
+ if (ifm == NULL) {
+ debuglog("Couldn't find interface entry for %d. Skipping.", ifindex);
+ continue;
+ }
+ /*
+ * if ICMP6_RR_FLAGS_FORCEAPPLY(A flag) is 0 and IFF_UP is off,
+ * the interface is not applied
+ */
+ if ((rr->rr_flags & ICMP6_RR_FLAGS_FORCEAPPLY) == 0 &&
+ (ifm->ifm_flags & IFF_UP) == 0)
+ continue;
+ /* TODO: interface scope check */
+ do_use_prefix(len, rpm, &irr, ifindex);
+ }
+ if (errno == ENXIO)
+ return 0;
+ else if (errno) {
+ errorlog("<%s> if_indextoname: %s", __func__,
+ strerror(errno));
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * call do_pco() for each Prefix Control Operations(PCOs) in a received
+ * Router Renumbering Command packet.
+ * return 0 on success, 1 on failure
+ */
+static int
+do_rr(int len, struct icmp6_router_renum *rr)
+{
+ struct rr_pco_match *rpm;
+ char *cp, *lim;
+
+ lim = (char *)rr + len;
+ cp = (char *)(rr + 1);
+ len -= sizeof(struct icmp6_router_renum);
+
+ /* get iflist block from kernel again, to get up-to-date information */
+ init_iflist();
+
+ while (cp < lim) {
+ int rpmlen;
+
+ rpm = (struct rr_pco_match *)cp;
+ if (len < sizeof(struct rr_pco_match)) {
+ tooshort:
+ errorlog("<%s> pkt too short. left len = %d. "
+ "gabage at end of pkt?", __func__, len);
+ return 1;
+ }
+ rpmlen = rpm->rpm_len << 3;
+ if (len < rpmlen)
+ goto tooshort;
+
+ if (do_pco(rr, rpmlen, rpm)) {
+ errorlog("<%s> invalid PCO", __func__);
+ goto next;
+ }
+
+ next:
+ cp += rpmlen;
+ len -= rpmlen;
+ }
+
+ return 0;
+}
+
+/*
+ * check validity of a router renumbering command packet
+ * return 0 on success, 1 on failure
+ */
+static int
+rr_command_check(int len, struct icmp6_router_renum *rr, struct in6_addr *from,
+ struct in6_addr *dst)
+{
+ char ntopbuf[INET6_ADDRSTRLEN];
+
+ /* omit rr minimal length check. hope kernel have done it. */
+ /* rr_command length check */
+ if (len < (sizeof(struct icmp6_router_renum) +
+ sizeof(struct rr_pco_match))) {
+ errorlog("<%s> rr_command len %d is too short",
+ __func__, len);
+ return 1;
+ }
+
+ /* destination check. only for multicast. omit unicast check. */
+ if (IN6_IS_ADDR_MULTICAST(dst) && !IN6_IS_ADDR_MC_LINKLOCAL(dst) &&
+ !IN6_IS_ADDR_MC_SITELOCAL(dst)) {
+ errorlog("<%s> dst mcast addr %s is illegal",
+ __func__,
+ inet_ntop(AF_INET6, dst, ntopbuf, INET6_ADDRSTRLEN));
+ return 1;
+ }
+
+ /* seqnum and segnum check */
+ if (rro.rro_seqnum > rr->rr_seqnum) {
+ errorlog("<%s> rcvd old seqnum %d from %s",
+ __func__, (u_int32_t)ntohl(rr->rr_seqnum),
+ inet_ntop(AF_INET6, from, ntopbuf, INET6_ADDRSTRLEN));
+ return 1;
+ }
+ if (rro.rro_seqnum == rr->rr_seqnum &&
+ (rr->rr_flags & ICMP6_RR_FLAGS_TEST) == 0 &&
+ RR_ISSET_SEGNUM(rro.rro_segnum_bits, rr->rr_segnum)) {
+ if ((rr->rr_flags & ICMP6_RR_FLAGS_REQRESULT) != 0)
+ errorlog("<%s> rcvd duped segnum %d from %s",
+ __func__, rr->rr_segnum,
+ inet_ntop(AF_INET6, from, ntopbuf,
+ INET6_ADDRSTRLEN));
+ return 0;
+ }
+
+ /* update seqnum */
+ if (rro.rro_seqnum != rr->rr_seqnum) {
+ /* then must be "<" */
+
+ /* init rro_segnum_bits */
+ memset(rro.rro_segnum_bits, 0,
+ sizeof(rro.rro_segnum_bits));
+ }
+ rro.rro_seqnum = rr->rr_seqnum;
+
+ return 0;
+}
+
+static void
+rr_command_input(int len, struct icmp6_router_renum *rr,
+ struct in6_addr *from, struct in6_addr *dst)
+{
+ /* rr_command validity check */
+ if (rr_command_check(len, rr, from, dst))
+ goto failed;
+ if ((rr->rr_flags & (ICMP6_RR_FLAGS_TEST|ICMP6_RR_FLAGS_REQRESULT)) ==
+ ICMP6_RR_FLAGS_TEST)
+ return;
+
+ /* do router renumbering */
+ if (do_rr(len, rr)) {
+ goto failed;
+ }
+
+ /* update segnum */
+ RR_SET_SEGNUM(rro.rro_segnum_bits, rr->rr_segnum);
+
+ return;
+
+ failed:
+ errorlog("<%s> received RR was invalid", __func__);
+ return;
+}
+
+void
+rr_input(int len, struct icmp6_router_renum *rr, struct in6_pktinfo *pi,
+ struct sockaddr_in6 *from, struct in6_addr *dst)
+{
+ char ntopbuf[2][INET6_ADDRSTRLEN], ifnamebuf[IFNAMSIZ];
+
+ debuglog("<%s> RR received from %s to %s on %s",
+ __func__,
+ inet_ntop(AF_INET6, &from->sin6_addr,
+ ntopbuf[0], INET6_ADDRSTRLEN),
+ inet_ntop(AF_INET6, &dst, ntopbuf[1], INET6_ADDRSTRLEN),
+ if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+
+ /* packet validation based on Section 4.1 of RFC2894 */
+ if (len < sizeof(struct icmp6_router_renum)) {
+ noticelog("<%s>: RR short message (size %d) from %s to %s on %s",
+ __func__, len,
+ inet_ntop(AF_INET6, &from->sin6_addr,
+ ntopbuf[0], INET6_ADDRSTRLEN),
+ inet_ntop(AF_INET6, &dst, ntopbuf[1], INET6_ADDRSTRLEN),
+ if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+ return;
+ }
+
+ /*
+ * If the IPv6 destination address is neither an All Routers multicast
+ * address [AARCH] nor one of the receiving router's unicast addresses,
+ * the message MUST be discarded and SHOULD be logged to network
+ * management.
+ * We rely on the kernel input routine for unicast addresses, and thus
+ * check multicast destinations only.
+ */
+ if (IN6_IS_ADDR_MULTICAST(&pi->ipi6_addr) &&
+ !IN6_ARE_ADDR_EQUAL(&in6a_site_allrouters, &pi->ipi6_addr)) {
+ noticelog("<%s>: RR message with invalid destination (%s) "
+ "from %s on %s",
+ __func__,
+ inet_ntop(AF_INET6, &dst, ntopbuf[0], INET6_ADDRSTRLEN),
+ inet_ntop(AF_INET6, &from->sin6_addr,
+ ntopbuf[1], INET6_ADDRSTRLEN),
+ if_indextoname(pi->ipi6_ifindex, ifnamebuf));
+ return;
+ }
+
+ rr_rcvifindex = pi->ipi6_ifindex;
+
+ switch (rr->rr_code) {
+ case ICMP6_ROUTER_RENUMBERING_COMMAND:
+ rr_command_input(len, rr, &from->sin6_addr, dst);
+ /* TODO: send reply msg */
+ break;
+ case ICMP6_ROUTER_RENUMBERING_RESULT:
+ /* RESULT will be processed by rrenumd */
+ break;
+ case ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET:
+ /* TODO: sequence number reset */
+ break;
+ default:
+ errorlog("<%s> received unknown code %d",
+ __func__, rr->rr_code);
+ break;
+
+ }
+
+ return;
+}
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