[Midnightbsd-cvs] src: icmp6.c.orig: doh
laffer1 at midnightbsd.org
laffer1 at midnightbsd.org
Sat Jan 10 21:42:32 EST 2009
Log Message:
-----------
doh
Removed Files:
-------------
src/sys/netinet6:
icmp6.c.orig
-------------- next part --------------
--- sys/netinet6/icmp6.c.orig
+++ /dev/null
@@ -1,2785 +0,0 @@
-/* $MidnightBSD: src/sys/netinet6/icmp6.c.orig,v 1.2 2009/01/11 02:41:57 laffer1 Exp $ */
-/* $FreeBSD: src/sys/netinet6/icmp6.c,v 1.80 2007/07/05 16:29:39 delphij Exp $ */
-/* $KAME: icmp6.c,v 1.211 2001/04/04 05:56:20 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.
- */
-
-/*-
- * Copyright (c) 1982, 1986, 1988, 1993
- * The Regents of the University of California. 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.
- * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
- *
- * @(#)ip_icmp.c 8.2 (Berkeley) 1/4/94
- */
-
-#include "opt_inet.h"
-#include "opt_inet6.h"
-#include "opt_ipsec.h"
-
-#include <sys/param.h>
-#include <sys/domain.h>
-#include <sys/kernel.h>
-#include <sys/lock.h>
-#include <sys/malloc.h>
-#include <sys/mbuf.h>
-#include <sys/protosw.h>
-#include <sys/signalvar.h>
-#include <sys/socket.h>
-#include <sys/socketvar.h>
-#include <sys/sx.h>
-#include <sys/syslog.h>
-#include <sys/systm.h>
-#include <sys/time.h>
-
-#include <net/if.h>
-#include <net/if_dl.h>
-#include <net/if_types.h>
-#include <net/route.h>
-
-#include <netinet/in.h>
-#include <netinet/in_pcb.h>
-#include <netinet/in_var.h>
-#include <netinet/ip6.h>
-#include <netinet/icmp6.h>
-#include <netinet/tcp_var.h>
-#include <netinet6/in6_ifattach.h>
-#include <netinet6/in6_pcb.h>
-#include <netinet6/ip6protosw.h>
-#include <netinet6/ip6_var.h>
-#include <netinet6/scope6_var.h>
-#include <netinet6/mld6_var.h>
-#include <netinet6/nd6.h>
-
-#ifdef IPSEC
-#include <netipsec/ipsec.h>
-#include <netipsec/key.h>
-#endif
-
-extern struct domain inet6domain;
-
-struct icmp6stat icmp6stat;
-
-extern struct inpcbinfo ripcbinfo;
-extern struct inpcbhead ripcb;
-extern int icmp6errppslim;
-static int icmp6errpps_count = 0;
-static struct timeval icmp6errppslim_last;
-extern int icmp6_nodeinfo;
-
-static void icmp6_errcount __P((struct icmp6errstat *, int, int));
-static int icmp6_rip6_input __P((struct mbuf **, int));
-static int icmp6_ratelimit __P((const struct in6_addr *, const int, const int));
-static const char *icmp6_redirect_diag __P((struct in6_addr *,
- struct in6_addr *, struct in6_addr *));
-static struct mbuf *ni6_input __P((struct mbuf *, int));
-static struct mbuf *ni6_nametodns __P((const char *, int, int));
-static int ni6_dnsmatch __P((const char *, int, const char *, int));
-static int ni6_addrs __P((struct icmp6_nodeinfo *, struct mbuf *,
- struct ifnet **, struct in6_addr *));
-static int ni6_store_addrs __P((struct icmp6_nodeinfo *, struct icmp6_nodeinfo *,
- struct ifnet *, int));
-static int icmp6_notify_error __P((struct mbuf **, int, int, int));
-
-
-void
-icmp6_init(void)
-{
-
- mld6_init();
-}
-
-static void
-icmp6_errcount(struct icmp6errstat *stat, int type, int code)
-{
- switch (type) {
- case ICMP6_DST_UNREACH:
- switch (code) {
- case ICMP6_DST_UNREACH_NOROUTE:
- stat->icp6errs_dst_unreach_noroute++;
- return;
- case ICMP6_DST_UNREACH_ADMIN:
- stat->icp6errs_dst_unreach_admin++;
- return;
- case ICMP6_DST_UNREACH_BEYONDSCOPE:
- stat->icp6errs_dst_unreach_beyondscope++;
- return;
- case ICMP6_DST_UNREACH_ADDR:
- stat->icp6errs_dst_unreach_addr++;
- return;
- case ICMP6_DST_UNREACH_NOPORT:
- stat->icp6errs_dst_unreach_noport++;
- return;
- }
- break;
- case ICMP6_PACKET_TOO_BIG:
- stat->icp6errs_packet_too_big++;
- return;
- case ICMP6_TIME_EXCEEDED:
- switch (code) {
- case ICMP6_TIME_EXCEED_TRANSIT:
- stat->icp6errs_time_exceed_transit++;
- return;
- case ICMP6_TIME_EXCEED_REASSEMBLY:
- stat->icp6errs_time_exceed_reassembly++;
- return;
- }
- break;
- case ICMP6_PARAM_PROB:
- switch (code) {
- case ICMP6_PARAMPROB_HEADER:
- stat->icp6errs_paramprob_header++;
- return;
- case ICMP6_PARAMPROB_NEXTHEADER:
- stat->icp6errs_paramprob_nextheader++;
- return;
- case ICMP6_PARAMPROB_OPTION:
- stat->icp6errs_paramprob_option++;
- return;
- }
- break;
- case ND_REDIRECT:
- stat->icp6errs_redirect++;
- return;
- }
- stat->icp6errs_unknown++;
-}
-
-/*
- * A wrapper function for icmp6_error() necessary when the erroneous packet
- * may not contain enough scope zone information.
- */
-void
-icmp6_error2(struct mbuf *m, int type, int code, int param,
- struct ifnet *ifp)
-{
- struct ip6_hdr *ip6;
-
- if (ifp == NULL)
- return;
-
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
-#else
- if (m->m_len < sizeof(struct ip6_hdr)) {
- m = m_pullup(m, sizeof(struct ip6_hdr));
- if (m == NULL)
- return;
- }
-#endif
-
- ip6 = mtod(m, struct ip6_hdr *);
-
- if (in6_setscope(&ip6->ip6_src, ifp, NULL) != 0)
- return;
- if (in6_setscope(&ip6->ip6_dst, ifp, NULL) != 0)
- return;
-
- icmp6_error(m, type, code, param);
-}
-
-/*
- * Generate an error packet of type error in response to bad IP6 packet.
- */
-void
-icmp6_error(struct mbuf *m, int type, int code, int param)
-{
- struct ip6_hdr *oip6, *nip6;
- struct icmp6_hdr *icmp6;
- u_int preplen;
- int off;
- int nxt;
-
- icmp6stat.icp6s_error++;
-
- /* count per-type-code statistics */
- icmp6_errcount(&icmp6stat.icp6s_outerrhist, type, code);
-
-#ifdef M_DECRYPTED /*not openbsd*/
- if (m->m_flags & M_DECRYPTED) {
- icmp6stat.icp6s_canterror++;
- goto freeit;
- }
-#endif
-
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), );
-#else
- if (m->m_len < sizeof(struct ip6_hdr)) {
- m = m_pullup(m, sizeof(struct ip6_hdr));
- if (m == NULL)
- return;
- }
-#endif
- oip6 = mtod(m, struct ip6_hdr *);
-
- /*
- * If the destination address of the erroneous packet is a multicast
- * address, or the packet was sent using link-layer multicast,
- * we should basically suppress sending an error (RFC 2463, Section
- * 2.4).
- * We have two exceptions (the item e.2 in that section):
- * - the Pakcet Too Big message can be sent for path MTU discovery.
- * - the Parameter Problem Message that can be allowed an icmp6 error
- * in the option type field. This check has been done in
- * ip6_unknown_opt(), so we can just check the type and code.
- */
- if ((m->m_flags & (M_BCAST|M_MCAST) ||
- IN6_IS_ADDR_MULTICAST(&oip6->ip6_dst)) &&
- (type != ICMP6_PACKET_TOO_BIG &&
- (type != ICMP6_PARAM_PROB ||
- code != ICMP6_PARAMPROB_OPTION)))
- goto freeit;
-
- /*
- * RFC 2463, 2.4 (e.5): source address check.
- * XXX: the case of anycast source?
- */
- if (IN6_IS_ADDR_UNSPECIFIED(&oip6->ip6_src) ||
- IN6_IS_ADDR_MULTICAST(&oip6->ip6_src))
- goto freeit;
-
- /*
- * If we are about to send ICMPv6 against ICMPv6 error/redirect,
- * don't do it.
- */
- nxt = -1;
- off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt);
- if (off >= 0 && nxt == IPPROTO_ICMPV6) {
- struct icmp6_hdr *icp;
-
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0, off + sizeof(struct icmp6_hdr), );
- icp = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
-#else
- IP6_EXTHDR_GET(icp, struct icmp6_hdr *, m, off,
- sizeof(*icp));
- if (icp == NULL) {
- icmp6stat.icp6s_tooshort++;
- return;
- }
-#endif
- if (icp->icmp6_type < ICMP6_ECHO_REQUEST ||
- icp->icmp6_type == ND_REDIRECT) {
- /*
- * ICMPv6 error
- * Special case: for redirect (which is
- * informational) we must not send icmp6 error.
- */
- icmp6stat.icp6s_canterror++;
- goto freeit;
- } else {
- /* ICMPv6 informational - send the error */
- }
- } else {
- /* non-ICMPv6 - send the error */
- }
-
- oip6 = mtod(m, struct ip6_hdr *); /* adjust pointer */
-
- /* Finally, do rate limitation check. */
- if (icmp6_ratelimit(&oip6->ip6_src, type, code)) {
- icmp6stat.icp6s_toofreq++;
- goto freeit;
- }
-
- /*
- * OK, ICMP6 can be generated.
- */
-
- if (m->m_pkthdr.len >= ICMPV6_PLD_MAXLEN)
- m_adj(m, ICMPV6_PLD_MAXLEN - m->m_pkthdr.len);
-
- preplen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
- M_PREPEND(m, preplen, M_DONTWAIT);
- if (m && m->m_len < preplen)
- m = m_pullup(m, preplen);
- if (m == NULL) {
- nd6log((LOG_DEBUG, "ENOBUFS in icmp6_error %d\n", __LINE__));
- return;
- }
-
- nip6 = mtod(m, struct ip6_hdr *);
- nip6->ip6_src = oip6->ip6_src;
- nip6->ip6_dst = oip6->ip6_dst;
-
- in6_clearscope(&oip6->ip6_src);
- in6_clearscope(&oip6->ip6_dst);
-
- icmp6 = (struct icmp6_hdr *)(nip6 + 1);
- icmp6->icmp6_type = type;
- icmp6->icmp6_code = code;
- icmp6->icmp6_pptr = htonl((u_int32_t)param);
-
- /*
- * icmp6_reflect() is designed to be in the input path.
- * icmp6_error() can be called from both input and output path,
- * and if we are in output path rcvif could contain bogus value.
- * clear m->m_pkthdr.rcvif for safety, we should have enough scope
- * information in ip header (nip6).
- */
- m->m_pkthdr.rcvif = NULL;
-
- icmp6stat.icp6s_outhist[type]++;
- icmp6_reflect(m, sizeof(struct ip6_hdr)); /* header order: IPv6 - ICMPv6 */
-
- return;
-
- freeit:
- /*
- * If we can't tell whether or not we can generate ICMP6, free it.
- */
- m_freem(m);
-}
-
-/*
- * Process a received ICMP6 message.
- */
-int
-icmp6_input(struct mbuf **mp, int *offp, int proto)
-{
- struct mbuf *m = *mp, *n;
- struct ip6_hdr *ip6, *nip6;
- struct icmp6_hdr *icmp6, *nicmp6;
- int off = *offp;
- int icmp6len = m->m_pkthdr.len - *offp;
- int code, sum, noff;
- char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN];
-
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_hdr), IPPROTO_DONE);
- /* m might change if M_LOOP. So, call mtod after this */
-#endif
-
- /*
- * Locate icmp6 structure in mbuf, and check
- * that not corrupted and of at least minimum length
- */
-
- ip6 = mtod(m, struct ip6_hdr *);
- if (icmp6len < sizeof(struct icmp6_hdr)) {
- icmp6stat.icp6s_tooshort++;
- goto freeit;
- }
-
- /*
- * calculate the checksum
- */
-#ifndef PULLDOWN_TEST
- icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
-#else
- IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
- if (icmp6 == NULL) {
- icmp6stat.icp6s_tooshort++;
- return IPPROTO_DONE;
- }
-#endif
- code = icmp6->icmp6_code;
-
- if ((sum = in6_cksum(m, IPPROTO_ICMPV6, off, icmp6len)) != 0) {
- nd6log((LOG_ERR,
- "ICMP6 checksum error(%d|%x) %s\n",
- icmp6->icmp6_type, sum,
- ip6_sprintf(ip6bufs, &ip6->ip6_src)));
- icmp6stat.icp6s_checksum++;
- goto freeit;
- }
-
- if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
- /*
- * Deliver very specific ICMP6 type only.
- * This is important to deliver TOOBIG. Otherwise PMTUD
- * will not work.
- */
- switch (icmp6->icmp6_type) {
- case ICMP6_DST_UNREACH:
- case ICMP6_PACKET_TOO_BIG:
- case ICMP6_TIME_EXCEEDED:
- break;
- default:
- goto freeit;
- }
- }
-
- icmp6stat.icp6s_inhist[icmp6->icmp6_type]++;
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_msg);
- if (icmp6->icmp6_type < ICMP6_INFOMSG_MASK)
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_error);
-
- switch (icmp6->icmp6_type) {
- case ICMP6_DST_UNREACH:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_dstunreach);
- switch (code) {
- case ICMP6_DST_UNREACH_NOROUTE:
- code = PRC_UNREACH_NET;
- break;
- case ICMP6_DST_UNREACH_ADMIN:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_adminprohib);
- code = PRC_UNREACH_PROTOCOL; /* is this a good code? */
- break;
- case ICMP6_DST_UNREACH_ADDR:
- code = PRC_HOSTDEAD;
- break;
- case ICMP6_DST_UNREACH_BEYONDSCOPE:
- /* I mean "source address was incorrect." */
- code = PRC_PARAMPROB;
- break;
- case ICMP6_DST_UNREACH_NOPORT:
- code = PRC_UNREACH_PORT;
- break;
- default:
- goto badcode;
- }
- goto deliver;
- break;
-
- case ICMP6_PACKET_TOO_BIG:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_pkttoobig);
-
- /* validation is made in icmp6_mtudisc_update */
-
- code = PRC_MSGSIZE;
-
- /*
- * Updating the path MTU will be done after examining
- * intermediate extension headers.
- */
- goto deliver;
- break;
-
- case ICMP6_TIME_EXCEEDED:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_timeexceed);
- switch (code) {
- case ICMP6_TIME_EXCEED_TRANSIT:
- code = PRC_TIMXCEED_INTRANS;
- break;
- case ICMP6_TIME_EXCEED_REASSEMBLY:
- code = PRC_TIMXCEED_REASS;
- break;
- default:
- goto badcode;
- }
- goto deliver;
- break;
-
- case ICMP6_PARAM_PROB:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_paramprob);
- switch (code) {
- case ICMP6_PARAMPROB_NEXTHEADER:
- code = PRC_UNREACH_PROTOCOL;
- break;
- case ICMP6_PARAMPROB_HEADER:
- case ICMP6_PARAMPROB_OPTION:
- code = PRC_PARAMPROB;
- break;
- default:
- goto badcode;
- }
- goto deliver;
- break;
-
- case ICMP6_ECHO_REQUEST:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echo);
- if (code != 0)
- goto badcode;
- if ((n = m_copy(m, 0, M_COPYALL)) == NULL) {
- /* Give up remote */
- break;
- }
- if ((n->m_flags & M_EXT) != 0
- || n->m_len < off + sizeof(struct icmp6_hdr)) {
- struct mbuf *n0 = n;
- const int maxlen = sizeof(*nip6) + sizeof(*nicmp6);
- int n0len;
-
- MGETHDR(n, M_DONTWAIT, n0->m_type);
- n0len = n0->m_pkthdr.len; /* save for use below */
- if (n)
- M_MOVE_PKTHDR(n, n0);
- if (n && maxlen >= MHLEN) {
- MCLGET(n, M_DONTWAIT);
- if ((n->m_flags & M_EXT) == 0) {
- m_free(n);
- n = NULL;
- }
- }
- if (n == NULL) {
- /* Give up remote */
- m_freem(n0);
- break;
- }
- /*
- * Copy IPv6 and ICMPv6 only.
- */
- nip6 = mtod(n, struct ip6_hdr *);
- bcopy(ip6, nip6, sizeof(struct ip6_hdr));
- nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
- bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
- noff = sizeof(struct ip6_hdr);
- /* new mbuf contains only ipv6+icmpv6 headers */
- n->m_len = noff + sizeof(struct icmp6_hdr);
- /*
- * Adjust mbuf. ip6_plen will be adjusted in
- * ip6_output().
- */
- m_adj(n0, off + sizeof(struct icmp6_hdr));
- /* recalculate complete packet size */
- n->m_pkthdr.len = n0len + (noff - off);
- n->m_next = n0;
- } else {
- nip6 = mtod(n, struct ip6_hdr *);
- IP6_EXTHDR_GET(nicmp6, struct icmp6_hdr *, n, off,
- sizeof(*nicmp6));
- noff = off;
- }
- nicmp6->icmp6_type = ICMP6_ECHO_REPLY;
- nicmp6->icmp6_code = 0;
- if (n) {
- icmp6stat.icp6s_reflect++;
- icmp6stat.icp6s_outhist[ICMP6_ECHO_REPLY]++;
- icmp6_reflect(n, noff);
- }
- break;
-
- case ICMP6_ECHO_REPLY:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_echoreply);
- if (code != 0)
- goto badcode;
- break;
-
- case MLD_LISTENER_QUERY:
- case MLD_LISTENER_REPORT:
- if (icmp6len < sizeof(struct mld_hdr))
- goto badlen;
- if (icmp6->icmp6_type == MLD_LISTENER_QUERY) /* XXX: ugly... */
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldquery);
- else
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mldreport);
- if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
- /* give up local */
- mld6_input(m, off);
- m = NULL;
- goto freeit;
- }
- mld6_input(n, off);
- /* m stays. */
- break;
-
- case MLD_LISTENER_DONE:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mlddone);
- if (icmp6len < sizeof(struct mld_hdr)) /* necessary? */
- goto badlen;
- break; /* nothing to be done in kernel */
-
- case MLD_MTRACE_RESP:
- case MLD_MTRACE:
- /* XXX: these two are experimental. not officially defined. */
- /* XXX: per-interface statistics? */
- break; /* just pass it to applications */
-
- case ICMP6_WRUREQUEST: /* ICMP6_FQDN_QUERY */
- {
- enum { WRU, FQDN } mode;
-
- if (!icmp6_nodeinfo)
- break;
-
- if (icmp6len == sizeof(struct icmp6_hdr) + 4)
- mode = WRU;
- else if (icmp6len >= sizeof(struct icmp6_nodeinfo))
- mode = FQDN;
- else
- goto badlen;
-
-#define hostnamelen strlen(hostname)
- if (mode == FQDN) {
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, sizeof(struct icmp6_nodeinfo),
- IPPROTO_DONE);
-#endif
- n = m_copy(m, 0, M_COPYALL);
- if (n)
- n = ni6_input(n, off);
- /* XXX meaningless if n == NULL */
- noff = sizeof(struct ip6_hdr);
- } else {
- u_char *p;
- int maxlen, maxhlen;
-
- /*
- * XXX: this combination of flags is pointless,
- * but should we keep this for compatibility?
- */
- if ((icmp6_nodeinfo & 5) != 5)
- break;
-
- if (code != 0)
- goto badcode;
- maxlen = sizeof(*nip6) + sizeof(*nicmp6) + 4;
- if (maxlen >= MCLBYTES) {
- /* Give up remote */
- break;
- }
- MGETHDR(n, M_DONTWAIT, m->m_type);
- if (n && maxlen > MHLEN) {
- MCLGET(n, M_DONTWAIT);
- if ((n->m_flags & M_EXT) == 0) {
- m_free(n);
- n = NULL;
- }
- }
- if (n && !m_dup_pkthdr(n, m, M_DONTWAIT)) {
- /*
- * Previous code did a blind M_COPY_PKTHDR
- * and said "just for rcvif". If true, then
- * we could tolerate the dup failing (due to
- * the deep copy of the tag chain). For now
- * be conservative and just fail.
- */
- m_free(n);
- n = NULL;
- }
- if (n == NULL) {
- /* Give up remote */
- break;
- }
- n->m_pkthdr.rcvif = NULL;
- n->m_len = 0;
- maxhlen = M_TRAILINGSPACE(n) - maxlen;
- if (maxhlen > hostnamelen)
- maxhlen = hostnamelen;
- /*
- * Copy IPv6 and ICMPv6 only.
- */
- nip6 = mtod(n, struct ip6_hdr *);
- bcopy(ip6, nip6, sizeof(struct ip6_hdr));
- nicmp6 = (struct icmp6_hdr *)(nip6 + 1);
- bcopy(icmp6, nicmp6, sizeof(struct icmp6_hdr));
- p = (u_char *)(nicmp6 + 1);
- bzero(p, 4);
- bcopy(hostname, p + 4, maxhlen); /* meaningless TTL */
- noff = sizeof(struct ip6_hdr);
- n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
- sizeof(struct icmp6_hdr) + 4 + maxhlen;
- nicmp6->icmp6_type = ICMP6_WRUREPLY;
- nicmp6->icmp6_code = 0;
- }
-#undef hostnamelen
- if (n) {
- icmp6stat.icp6s_reflect++;
- icmp6stat.icp6s_outhist[ICMP6_WRUREPLY]++;
- icmp6_reflect(n, noff);
- }
- break;
- }
-
- case ICMP6_WRUREPLY:
- if (code != 0)
- goto badcode;
- break;
-
- case ND_ROUTER_SOLICIT:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routersolicit);
- if (code != 0)
- goto badcode;
- if (icmp6len < sizeof(struct nd_router_solicit))
- goto badlen;
- if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
- /* give up local */
- nd6_rs_input(m, off, icmp6len);
- m = NULL;
- goto freeit;
- }
- nd6_rs_input(n, off, icmp6len);
- /* m stays. */
- break;
-
- case ND_ROUTER_ADVERT:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_routeradvert);
- if (code != 0)
- goto badcode;
- if (icmp6len < sizeof(struct nd_router_advert))
- goto badlen;
- if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
- /* give up local */
- nd6_ra_input(m, off, icmp6len);
- m = NULL;
- goto freeit;
- }
- nd6_ra_input(n, off, icmp6len);
- /* m stays. */
- break;
-
- case ND_NEIGHBOR_SOLICIT:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighborsolicit);
- if (code != 0)
- goto badcode;
- if (icmp6len < sizeof(struct nd_neighbor_solicit))
- goto badlen;
- if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
- /* give up local */
- nd6_ns_input(m, off, icmp6len);
- m = NULL;
- goto freeit;
- }
- nd6_ns_input(n, off, icmp6len);
- /* m stays. */
- break;
-
- case ND_NEIGHBOR_ADVERT:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_neighboradvert);
- if (code != 0)
- goto badcode;
- if (icmp6len < sizeof(struct nd_neighbor_advert))
- goto badlen;
- if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
- /* give up local */
- nd6_na_input(m, off, icmp6len);
- m = NULL;
- goto freeit;
- }
- nd6_na_input(n, off, icmp6len);
- /* m stays. */
- break;
-
- case ND_REDIRECT:
- icmp6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_redirect);
- if (code != 0)
- goto badcode;
- if (icmp6len < sizeof(struct nd_redirect))
- goto badlen;
- if ((n = m_copym(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) {
- /* give up local */
- icmp6_redirect_input(m, off);
- m = NULL;
- goto freeit;
- }
- icmp6_redirect_input(n, off);
- /* m stays. */
- break;
-
- case ICMP6_ROUTER_RENUMBERING:
- if (code != ICMP6_ROUTER_RENUMBERING_COMMAND &&
- code != ICMP6_ROUTER_RENUMBERING_RESULT)
- goto badcode;
- if (icmp6len < sizeof(struct icmp6_router_renum))
- goto badlen;
- break;
-
- default:
- nd6log((LOG_DEBUG,
- "icmp6_input: unknown type %d(src=%s, dst=%s, ifid=%d)\n",
- icmp6->icmp6_type, ip6_sprintf(ip6bufs, &ip6->ip6_src),
- ip6_sprintf(ip6bufd, &ip6->ip6_dst),
- m->m_pkthdr.rcvif ? m->m_pkthdr.rcvif->if_index : 0));
- if (icmp6->icmp6_type < ICMP6_ECHO_REQUEST) {
- /* ICMPv6 error: MUST deliver it by spec... */
- code = PRC_NCMDS;
- /* deliver */
- } else {
- /* ICMPv6 informational: MUST not deliver */
- break;
- }
- deliver:
- if (icmp6_notify_error(&m, off, icmp6len, code)) {
- /* In this case, m should've been freed. */
- return (IPPROTO_DONE);
- }
- break;
-
- badcode:
- icmp6stat.icp6s_badcode++;
- break;
-
- badlen:
- icmp6stat.icp6s_badlen++;
- break;
- }
-
- /* deliver the packet to appropriate sockets */
- icmp6_rip6_input(&m, *offp);
-
- return IPPROTO_DONE;
-
- freeit:
- m_freem(m);
- return IPPROTO_DONE;
-}
-
-static int
-icmp6_notify_error(struct mbuf **mp, int off, int icmp6len, int code)
-{
- struct mbuf *m = *mp;
- struct icmp6_hdr *icmp6;
- struct ip6_hdr *eip6;
- u_int32_t notifymtu;
- struct sockaddr_in6 icmp6src, icmp6dst;
-
- if (icmp6len < sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr)) {
- icmp6stat.icp6s_tooshort++;
- goto freeit;
- }
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off,
- sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr), -1);
- icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
-#else
- IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
- sizeof(*icmp6) + sizeof(struct ip6_hdr));
- if (icmp6 == NULL) {
- icmp6stat.icp6s_tooshort++;
- return (-1);
- }
-#endif
- eip6 = (struct ip6_hdr *)(icmp6 + 1);
-
- /* Detect the upper level protocol */
- {
- void (*ctlfunc) __P((int, struct sockaddr *, void *));
- u_int8_t nxt = eip6->ip6_nxt;
- int eoff = off + sizeof(struct icmp6_hdr) +
- sizeof(struct ip6_hdr);
- struct ip6ctlparam ip6cp;
- struct in6_addr *finaldst = NULL;
- int icmp6type = icmp6->icmp6_type;
- struct ip6_frag *fh;
- struct ip6_rthdr *rth;
- struct ip6_rthdr0 *rth0;
- int rthlen;
-
- while (1) { /* XXX: should avoid infinite loop explicitly? */
- struct ip6_ext *eh;
-
- switch (nxt) {
- case IPPROTO_HOPOPTS:
- case IPPROTO_DSTOPTS:
- case IPPROTO_AH:
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0,
- eoff + sizeof(struct ip6_ext), -1);
- eh = (struct ip6_ext *)(mtod(m, caddr_t) + eoff);
-#else
- IP6_EXTHDR_GET(eh, struct ip6_ext *, m,
- eoff, sizeof(*eh));
- if (eh == NULL) {
- icmp6stat.icp6s_tooshort++;
- return (-1);
- }
-#endif
-
- if (nxt == IPPROTO_AH)
- eoff += (eh->ip6e_len + 2) << 2;
- else
- eoff += (eh->ip6e_len + 1) << 3;
- nxt = eh->ip6e_nxt;
- break;
- case IPPROTO_ROUTING:
- /*
- * When the erroneous packet contains a
- * routing header, we should examine the
- * header to determine the final destination.
- * Otherwise, we can't properly update
- * information that depends on the final
- * destination (e.g. path MTU).
- */
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0, eoff + sizeof(*rth), -1);
- rth = (struct ip6_rthdr *)
- (mtod(m, caddr_t) + eoff);
-#else
- IP6_EXTHDR_GET(rth, struct ip6_rthdr *, m,
- eoff, sizeof(*rth));
- if (rth == NULL) {
- icmp6stat.icp6s_tooshort++;
- return (-1);
- }
-#endif
- rthlen = (rth->ip6r_len + 1) << 3;
- /*
- * XXX: currently there is no
- * officially defined type other
- * than type-0.
- * Note that if the segment left field
- * is 0, all intermediate hops must
- * have been passed.
- */
- if (rth->ip6r_segleft &&
- rth->ip6r_type == IPV6_RTHDR_TYPE_0) {
- int hops;
-
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0, eoff + rthlen, -1);
- rth0 = (struct ip6_rthdr0 *)
- (mtod(m, caddr_t) + eoff);
-#else
- IP6_EXTHDR_GET(rth0,
- struct ip6_rthdr0 *, m,
- eoff, rthlen);
- if (rth0 == NULL) {
- icmp6stat.icp6s_tooshort++;
- return (-1);
- }
-#endif
- /* just ignore a bogus header */
- if ((rth0->ip6r0_len % 2) == 0 &&
- (hops = rth0->ip6r0_len/2))
- finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1);
- }
- eoff += rthlen;
- nxt = rth->ip6r_nxt;
- break;
- case IPPROTO_FRAGMENT:
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, 0, eoff +
- sizeof(struct ip6_frag), -1);
- fh = (struct ip6_frag *)(mtod(m, caddr_t) +
- eoff);
-#else
- IP6_EXTHDR_GET(fh, struct ip6_frag *, m,
- eoff, sizeof(*fh));
- if (fh == NULL) {
- icmp6stat.icp6s_tooshort++;
- return (-1);
- }
-#endif
- /*
- * Data after a fragment header is meaningless
- * unless it is the first fragment, but
- * we'll go to the notify label for path MTU
- * discovery.
- */
- if (fh->ip6f_offlg & IP6F_OFF_MASK)
- goto notify;
-
- eoff += sizeof(struct ip6_frag);
- nxt = fh->ip6f_nxt;
- break;
- default:
- /*
- * This case includes ESP and the No Next
- * Header. In such cases going to the notify
- * label does not have any meaning
- * (i.e. ctlfunc will be NULL), but we go
- * anyway since we might have to update
- * path MTU information.
- */
- goto notify;
- }
- }
- notify:
-#ifndef PULLDOWN_TEST
- icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off);
-#else
- IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off,
- sizeof(*icmp6) + sizeof(struct ip6_hdr));
- if (icmp6 == NULL) {
- icmp6stat.icp6s_tooshort++;
- return (-1);
- }
-#endif
-
- /*
- * retrieve parameters from the inner IPv6 header, and convert
- * them into sockaddr structures.
- * XXX: there is no guarantee that the source or destination
- * addresses of the inner packet are in the same scope as
- * the addresses of the icmp packet. But there is no other
- * way to determine the zone.
- */
- eip6 = (struct ip6_hdr *)(icmp6 + 1);
-
- bzero(&icmp6dst, sizeof(icmp6dst));
- icmp6dst.sin6_len = sizeof(struct sockaddr_in6);
- icmp6dst.sin6_family = AF_INET6;
- if (finaldst == NULL)
- icmp6dst.sin6_addr = eip6->ip6_dst;
- else
- icmp6dst.sin6_addr = *finaldst;
- if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL))
- goto freeit;
- bzero(&icmp6src, sizeof(icmp6src));
- icmp6src.sin6_len = sizeof(struct sockaddr_in6);
- icmp6src.sin6_family = AF_INET6;
- icmp6src.sin6_addr = eip6->ip6_src;
- if (in6_setscope(&icmp6src.sin6_addr, m->m_pkthdr.rcvif, NULL))
- goto freeit;
- icmp6src.sin6_flowinfo =
- (eip6->ip6_flow & IPV6_FLOWLABEL_MASK);
-
- if (finaldst == NULL)
- finaldst = &eip6->ip6_dst;
- ip6cp.ip6c_m = m;
- ip6cp.ip6c_icmp6 = icmp6;
- ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1);
- ip6cp.ip6c_off = eoff;
- ip6cp.ip6c_finaldst = finaldst;
- ip6cp.ip6c_src = &icmp6src;
- ip6cp.ip6c_nxt = nxt;
-
- if (icmp6type == ICMP6_PACKET_TOO_BIG) {
- notifymtu = ntohl(icmp6->icmp6_mtu);
- ip6cp.ip6c_cmdarg = (void *)¬ifymtu;
- icmp6_mtudisc_update(&ip6cp, 1); /*XXX*/
- }
-
- ctlfunc = (void (*) __P((int, struct sockaddr *, void *)))
- (inet6sw[ip6_protox[nxt]].pr_ctlinput);
- if (ctlfunc) {
- (void) (*ctlfunc)(code, (struct sockaddr *)&icmp6dst,
- &ip6cp);
- }
- }
- *mp = m;
- return (0);
-
- freeit:
- m_freem(m);
- return (-1);
-}
-
-void
-icmp6_mtudisc_update(struct ip6ctlparam *ip6cp, int validated)
-{
- struct in6_addr *dst = ip6cp->ip6c_finaldst;
- struct icmp6_hdr *icmp6 = ip6cp->ip6c_icmp6;
- struct mbuf *m = ip6cp->ip6c_m; /* will be necessary for scope issue */
- u_int mtu = ntohl(icmp6->icmp6_mtu);
- struct in_conninfo inc;
-
-#if 0
- /*
- * RFC2460 section 5, last paragraph.
- * even though minimum link MTU for IPv6 is IPV6_MMTU,
- * we may see ICMPv6 too big with mtu < IPV6_MMTU
- * due to packet translator in the middle.
- * see ip6_output() and ip6_getpmtu() "alwaysfrag" case for
- * special handling.
- */
- if (mtu < IPV6_MMTU)
- return;
-#endif
-
- /*
- * we reject ICMPv6 too big with abnormally small value.
- * XXX what is the good definition of "abnormally small"?
- */
- if (mtu < sizeof(struct ip6_hdr) + sizeof(struct ip6_frag) + 8)
- return;
-
- if (!validated)
- return;
-
- bzero(&inc, sizeof(inc));
- inc.inc_flags = 1; /* IPv6 */
- inc.inc6_faddr = *dst;
- if (in6_setscope(&inc.inc6_faddr, m->m_pkthdr.rcvif, NULL))
- return;
-
- if (mtu < tcp_maxmtu6(&inc, NULL)) {
- tcp_hc_updatemtu(&inc, mtu);
- icmp6stat.icp6s_pmtuchg++;
- }
-}
-
-/*
- * Process a Node Information Query packet, based on
- * draft-ietf-ipngwg-icmp-name-lookups-07.
- *
- * Spec incompatibilities:
- * - IPv6 Subject address handling
- * - IPv4 Subject address handling support missing
- * - Proxy reply (answer even if it's not for me)
- * - joins NI group address at in6_ifattach() time only, does not cope
- * with hostname changes by sethostname(3)
- */
-#define hostnamelen strlen(hostname)
-static struct mbuf *
-ni6_input(struct mbuf *m, int off)
-{
- struct icmp6_nodeinfo *ni6, *nni6;
- struct mbuf *n = NULL;
- u_int16_t qtype;
- int subjlen;
- int replylen = sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
- struct ni_reply_fqdn *fqdn;
- int addrs; /* for NI_QTYPE_NODEADDR */
- struct ifnet *ifp = NULL; /* for NI_QTYPE_NODEADDR */
- struct in6_addr in6_subj; /* subject address */
- struct ip6_hdr *ip6;
- int oldfqdn = 0; /* if 1, return pascal string (03 draft) */
- char *subj = NULL;
- struct in6_ifaddr *ia6 = NULL;
-
- ip6 = mtod(m, struct ip6_hdr *);
-#ifndef PULLDOWN_TEST
- ni6 = (struct icmp6_nodeinfo *)(mtod(m, caddr_t) + off);
-#else
- IP6_EXTHDR_GET(ni6, struct icmp6_nodeinfo *, m, off, sizeof(*ni6));
- if (ni6 == NULL) {
- /* m is already reclaimed */
- return (NULL);
- }
-#endif
-
- /*
- * Validate IPv6 source address.
- * The default configuration MUST be to refuse answering queries from
- * global-scope addresses according to RFC4602.
- * Notes:
- * - it's not very clear what "refuse" means; this implementation
- * simply drops it.
- * - it's not very easy to identify global-scope (unicast) addresses
- * since there are many prefixes for them. It should be safer
- * and in practice sufficient to check "all" but loopback and
- * link-local (note that site-local unicast was deprecated and
- * ULA is defined as global scope-wise)
- */
- if ((icmp6_nodeinfo & ICMP6_NODEINFO_GLOBALOK) == 0 &&
- !IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) &&
- !IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_src))
- goto bad;
-
- /*
- * Validate IPv6 destination address.
- *
- * The Responder must discard the Query without further processing
- * unless it is one of the Responder's unicast or anycast addresses, or
- * a link-local scope multicast address which the Responder has joined.
- * [RFC4602, Section 5.]
- */
- if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
- if (!IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst))
- goto bad;
- /* else it's a link-local multicast, fine */
- } else { /* unicast or anycast */
- if ((ia6 = ip6_getdstifaddr(m)) == NULL)
- goto bad; /* XXX impossible */
-
- if ((ia6->ia6_flags & IN6_IFF_TEMPORARY) &&
- !(icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK)) {
- nd6log((LOG_DEBUG, "ni6_input: ignore node info to "
- "a temporary address in %s:%d",
- __FILE__, __LINE__));
- goto bad;
- }
- }
-
- /* validate query Subject field. */
- qtype = ntohs(ni6->ni_qtype);
- subjlen = m->m_pkthdr.len - off - sizeof(struct icmp6_nodeinfo);
- switch (qtype) {
- case NI_QTYPE_NOOP:
- case NI_QTYPE_SUPTYPES:
- /* 07 draft */
- if (ni6->ni_code == ICMP6_NI_SUBJ_FQDN && subjlen == 0)
- break;
- /* FALLTHROUGH */
- case NI_QTYPE_FQDN:
- case NI_QTYPE_NODEADDR:
- case NI_QTYPE_IPV4ADDR:
- switch (ni6->ni_code) {
- case ICMP6_NI_SUBJ_IPV6:
-#if ICMP6_NI_SUBJ_IPV6 != 0
- case 0:
-#endif
- /*
- * backward compatibility - try to accept 03 draft
- * format, where no Subject is present.
- */
- if (qtype == NI_QTYPE_FQDN && ni6->ni_code == 0 &&
- subjlen == 0) {
- oldfqdn++;
- break;
- }
-#if ICMP6_NI_SUBJ_IPV6 != 0
- if (ni6->ni_code != ICMP6_NI_SUBJ_IPV6)
- goto bad;
-#endif
-
- if (subjlen != sizeof(struct in6_addr))
- goto bad;
-
- /*
- * Validate Subject address.
- *
- * Not sure what exactly "address belongs to the node"
- * means in the spec, is it just unicast, or what?
- *
- * At this moment we consider Subject address as
- * "belong to the node" if the Subject address equals
- * to the IPv6 destination address; validation for
- * IPv6 destination address should have done enough
- * check for us.
- *
- * We do not do proxy at this moment.
- */
- /* m_pulldown instead of copy? */
- m_copydata(m, off + sizeof(struct icmp6_nodeinfo),
- subjlen, (caddr_t)&in6_subj);
- if (in6_setscope(&in6_subj, m->m_pkthdr.rcvif, NULL))
- goto bad;
-
- subj = (char *)&in6_subj;
- if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &in6_subj))
- break;
-
- /*
- * XXX if we are to allow other cases, we should really
- * be careful about scope here.
- * basically, we should disallow queries toward IPv6
- * destination X with subject Y,
- * if scope(X) > scope(Y).
- * if we allow scope(X) > scope(Y), it will result in
- * information leakage across scope boundary.
- */
- goto bad;
-
- case ICMP6_NI_SUBJ_FQDN:
- /*
- * Validate Subject name with gethostname(3).
- *
- * The behavior may need some debate, since:
- * - we are not sure if the node has FQDN as
- * hostname (returned by gethostname(3)).
- * - the code does wildcard match for truncated names.
- * however, we are not sure if we want to perform
- * wildcard match, if gethostname(3) side has
- * truncated hostname.
- */
- n = ni6_nametodns(hostname, hostnamelen, 0);
- if (!n || n->m_next || n->m_len == 0)
- goto bad;
- IP6_EXTHDR_GET(subj, char *, m,
- off + sizeof(struct icmp6_nodeinfo), subjlen);
- if (subj == NULL)
- goto bad;
- if (!ni6_dnsmatch(subj, subjlen, mtod(n, const char *),
- n->m_len)) {
- goto bad;
- }
- m_freem(n);
- n = NULL;
- break;
-
- case ICMP6_NI_SUBJ_IPV4: /* XXX: to be implemented? */
- default:
- goto bad;
- }
- break;
- }
-
- /* refuse based on configuration. XXX ICMP6_NI_REFUSED? */
- switch (qtype) {
- case NI_QTYPE_FQDN:
- if ((icmp6_nodeinfo & ICMP6_NODEINFO_FQDNOK) == 0)
- goto bad;
- break;
- case NI_QTYPE_NODEADDR:
- case NI_QTYPE_IPV4ADDR:
- if ((icmp6_nodeinfo & ICMP6_NODEINFO_NODEADDROK) == 0)
- goto bad;
- break;
- }
-
- /* guess reply length */
- switch (qtype) {
- case NI_QTYPE_NOOP:
- break; /* no reply data */
- case NI_QTYPE_SUPTYPES:
- replylen += sizeof(u_int32_t);
- break;
- case NI_QTYPE_FQDN:
- /* XXX will append an mbuf */
- replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
- break;
- case NI_QTYPE_NODEADDR:
- addrs = ni6_addrs(ni6, m, &ifp, (struct in6_addr *)subj);
- if ((replylen += addrs * (sizeof(struct in6_addr) +
- sizeof(u_int32_t))) > MCLBYTES)
- replylen = MCLBYTES; /* XXX: will truncate pkt later */
- break;
- case NI_QTYPE_IPV4ADDR:
- /* unsupported - should respond with unknown Qtype? */
- break;
- default:
- /*
- * XXX: We must return a reply with the ICMP6 code
- * `unknown Qtype' in this case. However we regard the case
- * as an FQDN query for backward compatibility.
- * Older versions set a random value to this field,
- * so it rarely varies in the defined qtypes.
- * But the mechanism is not reliable...
- * maybe we should obsolete older versions.
- */
- qtype = NI_QTYPE_FQDN;
- /* XXX will append an mbuf */
- replylen += offsetof(struct ni_reply_fqdn, ni_fqdn_namelen);
- oldfqdn++;
- break;
- }
-
- /* allocate an mbuf to reply. */
- MGETHDR(n, M_DONTWAIT, m->m_type);
- if (n == NULL) {
- m_freem(m);
- return (NULL);
- }
- M_MOVE_PKTHDR(n, m); /* just for recvif */
- if (replylen > MHLEN) {
- if (replylen > MCLBYTES) {
- /*
- * XXX: should we try to allocate more? But MCLBYTES
- * is probably much larger than IPV6_MMTU...
- */
- goto bad;
- }
- MCLGET(n, M_DONTWAIT);
- if ((n->m_flags & M_EXT) == 0) {
- goto bad;
- }
- }
- n->m_pkthdr.len = n->m_len = replylen;
-
- /* copy mbuf header and IPv6 + Node Information base headers */
- bcopy(mtod(m, caddr_t), mtod(n, caddr_t), sizeof(struct ip6_hdr));
- nni6 = (struct icmp6_nodeinfo *)(mtod(n, struct ip6_hdr *) + 1);
- bcopy((caddr_t)ni6, (caddr_t)nni6, sizeof(struct icmp6_nodeinfo));
-
- /* qtype dependent procedure */
- switch (qtype) {
- case NI_QTYPE_NOOP:
- nni6->ni_code = ICMP6_NI_SUCCESS;
- nni6->ni_flags = 0;
- break;
- case NI_QTYPE_SUPTYPES:
- {
- u_int32_t v;
- nni6->ni_code = ICMP6_NI_SUCCESS;
- nni6->ni_flags = htons(0x0000); /* raw bitmap */
- /* supports NOOP, SUPTYPES, FQDN, and NODEADDR */
- v = (u_int32_t)htonl(0x0000000f);
- bcopy(&v, nni6 + 1, sizeof(u_int32_t));
- break;
- }
- case NI_QTYPE_FQDN:
- nni6->ni_code = ICMP6_NI_SUCCESS;
- fqdn = (struct ni_reply_fqdn *)(mtod(n, caddr_t) +
- sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo));
- nni6->ni_flags = 0; /* XXX: meaningless TTL */
- fqdn->ni_fqdn_ttl = 0; /* ditto. */
- /*
- * XXX do we really have FQDN in variable "hostname"?
- */
- n->m_next = ni6_nametodns(hostname, hostnamelen, oldfqdn);
- if (n->m_next == NULL)
- goto bad;
- /* XXX we assume that n->m_next is not a chain */
- if (n->m_next->m_next != NULL)
- goto bad;
- n->m_pkthdr.len += n->m_next->m_len;
- break;
- case NI_QTYPE_NODEADDR:
- {
- int lenlim, copied;
-
- nni6->ni_code = ICMP6_NI_SUCCESS;
- n->m_pkthdr.len = n->m_len =
- sizeof(struct ip6_hdr) + sizeof(struct icmp6_nodeinfo);
- lenlim = M_TRAILINGSPACE(n);
- copied = ni6_store_addrs(ni6, nni6, ifp, lenlim);
- /* XXX: reset mbuf length */
- n->m_pkthdr.len = n->m_len = sizeof(struct ip6_hdr) +
- sizeof(struct icmp6_nodeinfo) + copied;
- break;
- }
- default:
- break; /* XXX impossible! */
- }
-
- nni6->ni_type = ICMP6_NI_REPLY;
- m_freem(m);
- return (n);
-
- bad:
- m_freem(m);
- if (n)
- m_freem(n);
- return (NULL);
-}
-#undef hostnamelen
-
-/*
- * make a mbuf with DNS-encoded string. no compression support.
- *
- * XXX names with less than 2 dots (like "foo" or "foo.section") will be
- * treated as truncated name (two \0 at the end). this is a wild guess.
- *
- * old - return pascal string if non-zero
- */
-static struct mbuf *
-ni6_nametodns(const char *name, int namelen, int old)
-{
- struct mbuf *m;
- char *cp, *ep;
- const char *p, *q;
- int i, len, nterm;
-
- if (old)
- len = namelen + 1;
- else
- len = MCLBYTES;
-
- /* because MAXHOSTNAMELEN is usually 256, we use cluster mbuf */
- MGET(m, M_DONTWAIT, MT_DATA);
- if (m && len > MLEN) {
- MCLGET(m, M_DONTWAIT);
- if ((m->m_flags & M_EXT) == 0)
- goto fail;
- }
- if (!m)
- goto fail;
- m->m_next = NULL;
-
- if (old) {
- m->m_len = len;
- *mtod(m, char *) = namelen;
- bcopy(name, mtod(m, char *) + 1, namelen);
- return m;
- } else {
- m->m_len = 0;
- cp = mtod(m, char *);
- ep = mtod(m, char *) + M_TRAILINGSPACE(m);
-
- /* if not certain about my name, return empty buffer */
- if (namelen == 0)
- return m;
-
- /*
- * guess if it looks like shortened hostname, or FQDN.
- * shortened hostname needs two trailing "\0".
- */
- i = 0;
- for (p = name; p < name + namelen; p++) {
- if (*p && *p == '.')
- i++;
- }
- if (i < 2)
- nterm = 2;
- else
- nterm = 1;
-
- p = name;
- while (cp < ep && p < name + namelen) {
- i = 0;
- for (q = p; q < name + namelen && *q && *q != '.'; q++)
- i++;
- /* result does not fit into mbuf */
- if (cp + i + 1 >= ep)
- goto fail;
- /*
- * DNS label length restriction, RFC1035 page 8.
- * "i == 0" case is included here to avoid returning
- * 0-length label on "foo..bar".
- */
- if (i <= 0 || i >= 64)
- goto fail;
- *cp++ = i;
- bcopy(p, cp, i);
- cp += i;
- p = q;
- if (p < name + namelen && *p == '.')
- p++;
- }
- /* termination */
- if (cp + nterm >= ep)
- goto fail;
- while (nterm-- > 0)
- *cp++ = '\0';
- m->m_len = cp - mtod(m, char *);
- return m;
- }
-
- panic("should not reach here");
- /* NOTREACHED */
-
- fail:
- if (m)
- m_freem(m);
- return NULL;
-}
-
-/*
- * check if two DNS-encoded string matches. takes care of truncated
- * form (with \0\0 at the end). no compression support.
- * XXX upper/lowercase match (see RFC2065)
- */
-static int
-ni6_dnsmatch(const char *a, int alen, const char *b, int blen)
-{
- const char *a0, *b0;
- int l;
-
- /* simplest case - need validation? */
- if (alen == blen && bcmp(a, b, alen) == 0)
- return 1;
-
- a0 = a;
- b0 = b;
-
- /* termination is mandatory */
- if (alen < 2 || blen < 2)
- return 0;
- if (a0[alen - 1] != '\0' || b0[blen - 1] != '\0')
- return 0;
- alen--;
- blen--;
-
- while (a - a0 < alen && b - b0 < blen) {
- if (a - a0 + 1 > alen || b - b0 + 1 > blen)
- return 0;
-
- if ((signed char)a[0] < 0 || (signed char)b[0] < 0)
- return 0;
- /* we don't support compression yet */
- if (a[0] >= 64 || b[0] >= 64)
- return 0;
-
- /* truncated case */
- if (a[0] == 0 && a - a0 == alen - 1)
- return 1;
- if (b[0] == 0 && b - b0 == blen - 1)
- return 1;
- if (a[0] == 0 || b[0] == 0)
- return 0;
-
- if (a[0] != b[0])
- return 0;
- l = a[0];
- if (a - a0 + 1 + l > alen || b - b0 + 1 + l > blen)
- return 0;
- if (bcmp(a + 1, b + 1, l) != 0)
- return 0;
-
- a += 1 + l;
- b += 1 + l;
- }
-
- if (a - a0 == alen && b - b0 == blen)
- return 1;
- else
- return 0;
-}
-
-/*
- * calculate the number of addresses to be returned in the node info reply.
- */
-static int
-ni6_addrs(struct icmp6_nodeinfo *ni6, struct mbuf *m, struct ifnet **ifpp,
- struct in6_addr *subj)
-{
- struct ifnet *ifp;
- struct in6_ifaddr *ifa6;
- struct ifaddr *ifa;
- int addrs = 0, addrsofif, iffound = 0;
- int niflags = ni6->ni_flags;
-
- if ((niflags & NI_NODEADDR_FLAG_ALL) == 0) {
- switch (ni6->ni_code) {
- case ICMP6_NI_SUBJ_IPV6:
- if (subj == NULL) /* must be impossible... */
- return (0);
- break;
- default:
- /*
- * XXX: we only support IPv6 subject address for
- * this Qtype.
- */
- return (0);
- }
- }
-
- IFNET_RLOCK();
- for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
- addrsofif = 0;
- TAILQ_FOREACH(ifa, &ifp->if_addrlist, ifa_list) {
- if (ifa->ifa_addr->sa_family != AF_INET6)
- continue;
- ifa6 = (struct in6_ifaddr *)ifa;
-
- if ((niflags & NI_NODEADDR_FLAG_ALL) == 0 &&
- IN6_ARE_ADDR_EQUAL(subj, &ifa6->ia_addr.sin6_addr))
- iffound = 1;
-
- /*
- * IPv4-mapped addresses can only be returned by a
- * Node Information proxy, since they represent
- * addresses of IPv4-only nodes, which perforce do
- * not implement this protocol.
- * [icmp-name-lookups-07, Section 5.4]
- * So we don't support NI_NODEADDR_FLAG_COMPAT in
- * this function at this moment.
- */
-
- /* What do we have to do about ::1? */
- switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
- case IPV6_ADDR_SCOPE_LINKLOCAL:
- if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
- continue;
- break;
- case IPV6_ADDR_SCOPE_SITELOCAL:
- if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
- continue;
- break;
- case IPV6_ADDR_SCOPE_GLOBAL:
- if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
- continue;
- break;
- default:
- continue;
- }
-
- /*
- * check if anycast is okay.
- * XXX: just experimental. not in the spec.
- */
- if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
- (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
- continue; /* we need only unicast addresses */
- if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
- (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
- continue;
- }
- addrsofif++; /* count the address */
- }
- if (iffound) {
- *ifpp = ifp;
- IFNET_RUNLOCK();
- return (addrsofif);
- }
-
- addrs += addrsofif;
- }
- IFNET_RUNLOCK();
-
- return (addrs);
-}
-
-static int
-ni6_store_addrs(struct icmp6_nodeinfo *ni6, struct icmp6_nodeinfo *nni6,
- struct ifnet *ifp0, int resid)
-{
- struct ifnet *ifp = ifp0 ? ifp0 : TAILQ_FIRST(&ifnet);
- struct in6_ifaddr *ifa6;
- struct ifaddr *ifa;
- struct ifnet *ifp_dep = NULL;
- int copied = 0, allow_deprecated = 0;
- u_char *cp = (u_char *)(nni6 + 1);
- int niflags = ni6->ni_flags;
- u_int32_t ltime;
-
- if (ifp0 == NULL && !(niflags & NI_NODEADDR_FLAG_ALL))
- return (0); /* needless to copy */
-
- IFNET_RLOCK();
- again:
-
- for (; ifp; ifp = TAILQ_NEXT(ifp, if_list)) {
- for (ifa = ifp->if_addrlist.tqh_first; ifa;
- ifa = ifa->ifa_list.tqe_next) {
- if (ifa->ifa_addr->sa_family != AF_INET6)
- continue;
- ifa6 = (struct in6_ifaddr *)ifa;
-
- if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) != 0 &&
- allow_deprecated == 0) {
- /*
- * prefererred address should be put before
- * deprecated addresses.
- */
-
- /* record the interface for later search */
- if (ifp_dep == NULL)
- ifp_dep = ifp;
-
- continue;
- } else if ((ifa6->ia6_flags & IN6_IFF_DEPRECATED) == 0 &&
- allow_deprecated != 0)
- continue; /* we now collect deprecated addrs */
-
- /* What do we have to do about ::1? */
- switch (in6_addrscope(&ifa6->ia_addr.sin6_addr)) {
- case IPV6_ADDR_SCOPE_LINKLOCAL:
- if ((niflags & NI_NODEADDR_FLAG_LINKLOCAL) == 0)
- continue;
- break;
- case IPV6_ADDR_SCOPE_SITELOCAL:
- if ((niflags & NI_NODEADDR_FLAG_SITELOCAL) == 0)
- continue;
- break;
- case IPV6_ADDR_SCOPE_GLOBAL:
- if ((niflags & NI_NODEADDR_FLAG_GLOBAL) == 0)
- continue;
- break;
- default:
- continue;
- }
-
- /*
- * check if anycast is okay.
- * XXX: just experimental. not in the spec.
- */
- if ((ifa6->ia6_flags & IN6_IFF_ANYCAST) != 0 &&
- (niflags & NI_NODEADDR_FLAG_ANYCAST) == 0)
- continue;
- if ((ifa6->ia6_flags & IN6_IFF_TEMPORARY) != 0 &&
- (icmp6_nodeinfo & ICMP6_NODEINFO_TMPADDROK) == 0) {
- continue;
- }
-
- /* now we can copy the address */
- if (resid < sizeof(struct in6_addr) +
- sizeof(u_int32_t)) {
- /*
- * We give up much more copy.
- * Set the truncate flag and return.
- */
- nni6->ni_flags |= NI_NODEADDR_FLAG_TRUNCATE;
- IFNET_RUNLOCK();
- return (copied);
- }
-
- /*
- * Set the TTL of the address.
- * The TTL value should be one of the following
- * according to the specification:
- *
- * 1. The remaining lifetime of a DHCP lease on the
- * address, or
- * 2. The remaining Valid Lifetime of a prefix from
- * which the address was derived through Stateless
- * Autoconfiguration.
- *
- * Note that we currently do not support stateful
- * address configuration by DHCPv6, so the former
- * case can't happen.
- */
- if (ifa6->ia6_lifetime.ia6t_expire == 0)
- ltime = ND6_INFINITE_LIFETIME;
- else {
- if (ifa6->ia6_lifetime.ia6t_expire >
- time_second)
- ltime = htonl(ifa6->ia6_lifetime.ia6t_expire - time_second);
- else
- ltime = 0;
- }
-
- bcopy(<ime, cp, sizeof(u_int32_t));
- cp += sizeof(u_int32_t);
-
- /* copy the address itself */
- bcopy(&ifa6->ia_addr.sin6_addr, cp,
- sizeof(struct in6_addr));
- in6_clearscope((struct in6_addr *)cp); /* XXX */
- cp += sizeof(struct in6_addr);
-
- resid -= (sizeof(struct in6_addr) + sizeof(u_int32_t));
- copied += (sizeof(struct in6_addr) + sizeof(u_int32_t));
- }
- if (ifp0) /* we need search only on the specified IF */
- break;
- }
-
- if (allow_deprecated == 0 && ifp_dep != NULL) {
- ifp = ifp_dep;
- allow_deprecated = 1;
-
- goto again;
- }
-
- IFNET_RUNLOCK();
-
- return (copied);
-}
-
-/*
- * XXX almost dup'ed code with rip6_input.
- */
-static int
-icmp6_rip6_input(struct mbuf **mp, int off)
-{
- struct mbuf *m = *mp;
- struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
- struct in6pcb *in6p;
- struct in6pcb *last = NULL;
- struct sockaddr_in6 fromsa;
- struct icmp6_hdr *icmp6;
- struct mbuf *opts = NULL;
-
-#ifndef PULLDOWN_TEST
- /* this is assumed to be safe. */
- icmp6 = (struct icmp6_hdr *)((caddr_t)ip6 + off);
-#else
- IP6_EXTHDR_GET(icmp6, struct icmp6_hdr *, m, off, sizeof(*icmp6));
- if (icmp6 == NULL) {
- /* m is already reclaimed */
- return (IPPROTO_DONE);
- }
-#endif
-
- /*
- * XXX: the address may have embedded scope zone ID, which should be
- * hidden from applications.
- */
- bzero(&fromsa, sizeof(fromsa));
- fromsa.sin6_family = AF_INET6;
- fromsa.sin6_len = sizeof(struct sockaddr_in6);
- fromsa.sin6_addr = ip6->ip6_src;
- if (sa6_recoverscope(&fromsa)) {
- m_freem(m);
- return (IPPROTO_DONE);
- }
-
- INP_INFO_RLOCK(&ripcbinfo);
- LIST_FOREACH(in6p, &ripcb, inp_list) {
- INP_LOCK(in6p);
- if ((in6p->inp_vflag & INP_IPV6) == 0) {
- docontinue:
- INP_UNLOCK(in6p);
- continue;
- }
- if (in6p->in6p_ip6_nxt != IPPROTO_ICMPV6)
- goto docontinue;
- if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) &&
- !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst))
- goto docontinue;
- if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
- !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src))
- goto docontinue;
- if (in6p->in6p_icmp6filt
- && ICMP6_FILTER_WILLBLOCK(icmp6->icmp6_type,
- in6p->in6p_icmp6filt))
- goto docontinue;
- if (last) {
- struct mbuf *n = NULL;
-
- /*
- * Recent network drivers tend to allocate a single
- * mbuf cluster, rather than to make a couple of
- * mbufs without clusters. Also, since the IPv6 code
- * path tries to avoid m_pullup(), it is highly
- * probable that we still have an mbuf cluster here
- * even though the necessary length can be stored in an
- * mbuf's internal buffer.
- * Meanwhile, the default size of the receive socket
- * buffer for raw sockets is not so large. This means
- * the possibility of packet loss is relatively higher
- * than before. To avoid this scenario, we copy the
- * received data to a separate mbuf that does not use
- * a cluster, if possible.
- * XXX: it is better to copy the data after stripping
- * intermediate headers.
- */
- if ((m->m_flags & M_EXT) && m->m_next == NULL &&
- m->m_len <= MHLEN) {
- MGET(n, M_DONTWAIT, m->m_type);
- if (n != NULL) {
- if (m_dup_pkthdr(n, m, M_NOWAIT)) {
- bcopy(m->m_data, n->m_data,
- m->m_len);
- n->m_len = m->m_len;
- } else {
- m_free(n);
- n = NULL;
- }
- }
- }
- if (n != NULL ||
- (n = m_copy(m, 0, (int)M_COPYALL)) != NULL) {
- if (last->in6p_flags & IN6P_CONTROLOPTS)
- ip6_savecontrol(last, n, &opts);
- /* strip intermediate headers */
- m_adj(n, off);
- SOCKBUF_LOCK(&last->in6p_socket->so_rcv);
- if (sbappendaddr_locked(
- &last->in6p_socket->so_rcv,
- (struct sockaddr *)&fromsa, n, opts)
- == 0) {
- /* should notify about lost packet */
- m_freem(n);
- if (opts) {
- m_freem(opts);
- }
- SOCKBUF_UNLOCK(
- &last->in6p_socket->so_rcv);
- } else
- sorwakeup_locked(last->in6p_socket);
- opts = NULL;
- }
- INP_UNLOCK(last);
- }
- last = in6p;
- }
- if (last) {
- if (last->in6p_flags & IN6P_CONTROLOPTS)
- ip6_savecontrol(last, m, &opts);
- /* strip intermediate headers */
- m_adj(m, off);
-
- /* avoid using mbuf clusters if possible (see above) */
- if ((m->m_flags & M_EXT) && m->m_next == NULL &&
- m->m_len <= MHLEN) {
- struct mbuf *n;
-
- MGET(n, M_DONTWAIT, m->m_type);
- if (n != NULL) {
- if (m_dup_pkthdr(n, m, M_NOWAIT)) {
- bcopy(m->m_data, n->m_data, m->m_len);
- n->m_len = m->m_len;
-
- m_freem(m);
- m = n;
- } else {
- m_freem(n);
- n = NULL;
- }
- }
- }
- SOCKBUF_LOCK(&last->in6p_socket->so_rcv);
- if (sbappendaddr_locked(&last->in6p_socket->so_rcv,
- (struct sockaddr *)&fromsa, m, opts) == 0) {
- m_freem(m);
- if (opts)
- m_freem(opts);
- SOCKBUF_UNLOCK(&last->in6p_socket->so_rcv);
- } else
- sorwakeup_locked(last->in6p_socket);
- INP_UNLOCK(last);
- } else {
- m_freem(m);
- ip6stat.ip6s_delivered--;
- }
- INP_INFO_RUNLOCK(&ripcbinfo);
- return IPPROTO_DONE;
-}
-
-/*
- * Reflect the ip6 packet back to the source.
- * OFF points to the icmp6 header, counted from the top of the mbuf.
- */
-void
-icmp6_reflect(struct mbuf *m, size_t off)
-{
- struct ip6_hdr *ip6;
- struct icmp6_hdr *icmp6;
- struct in6_ifaddr *ia;
- int plen;
- int type, code;
- struct ifnet *outif = NULL;
- struct in6_addr origdst, *src = NULL;
-
- /* too short to reflect */
- if (off < sizeof(struct ip6_hdr)) {
- nd6log((LOG_DEBUG,
- "sanity fail: off=%lx, sizeof(ip6)=%lx in %s:%d\n",
- (u_long)off, (u_long)sizeof(struct ip6_hdr),
- __FILE__, __LINE__));
- goto bad;
- }
-
- /*
- * If there are extra headers between IPv6 and ICMPv6, strip
- * off that header first.
- */
-#ifdef DIAGNOSTIC
- if (sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) > MHLEN)
- panic("assumption failed in icmp6_reflect");
-#endif
- if (off > sizeof(struct ip6_hdr)) {
- size_t l;
- struct ip6_hdr nip6;
-
- l = off - sizeof(struct ip6_hdr);
- m_copydata(m, 0, sizeof(nip6), (caddr_t)&nip6);
- m_adj(m, l);
- l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
- if (m->m_len < l) {
- if ((m = m_pullup(m, l)) == NULL)
- return;
- }
- bcopy((caddr_t)&nip6, mtod(m, caddr_t), sizeof(nip6));
- } else /* off == sizeof(struct ip6_hdr) */ {
- size_t l;
- l = sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr);
- if (m->m_len < l) {
- if ((m = m_pullup(m, l)) == NULL)
- return;
- }
- }
- plen = m->m_pkthdr.len - sizeof(struct ip6_hdr);
- ip6 = mtod(m, struct ip6_hdr *);
- ip6->ip6_nxt = IPPROTO_ICMPV6;
- icmp6 = (struct icmp6_hdr *)(ip6 + 1);
- type = icmp6->icmp6_type; /* keep type for statistics */
- code = icmp6->icmp6_code; /* ditto. */
-
- origdst = ip6->ip6_dst;
- /*
- * ip6_input() drops a packet if its src is multicast.
- * So, the src is never multicast.
- */
- ip6->ip6_dst = ip6->ip6_src;
-
- /*
- * If the incoming packet was addressed directly to us (i.e. unicast),
- * use dst as the src for the reply.
- * The IN6_IFF_NOTREADY case should be VERY rare, but is possible
- * (for example) when we encounter an error while forwarding procedure
- * destined to a duplicated address of ours.
- * Note that ip6_getdstifaddr() may fail if we are in an error handling
- * procedure of an outgoing packet of our own, in which case we need
- * to search in the ifaddr list.
- */
- if (!IN6_IS_ADDR_MULTICAST(&origdst)) {
- if ((ia = ip6_getdstifaddr(m))) {
- if (!(ia->ia6_flags &
- (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY)))
- src = &ia->ia_addr.sin6_addr;
- } else {
- struct sockaddr_in6 d;
-
- bzero(&d, sizeof(d));
- d.sin6_family = AF_INET6;
- d.sin6_len = sizeof(d);
- d.sin6_addr = origdst;
- ia = (struct in6_ifaddr *)
- ifa_ifwithaddr((struct sockaddr *)&d);
- if (ia &&
- !(ia->ia6_flags &
- (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY))) {
- src = &ia->ia_addr.sin6_addr;
- }
- }
- }
-
- if (src == NULL) {
- int e;
- struct sockaddr_in6 sin6;
- struct route_in6 ro;
-
- /*
- * This case matches to multicasts, our anycast, or unicasts
- * that we do not own. Select a source address based on the
- * source address of the erroneous packet.
- */
- bzero(&sin6, sizeof(sin6));
- sin6.sin6_family = AF_INET6;
- sin6.sin6_len = sizeof(sin6);
- sin6.sin6_addr = ip6->ip6_dst; /* zone ID should be embedded */
-
- bzero(&ro, sizeof(ro));
- src = in6_selectsrc(&sin6, NULL, NULL, &ro, NULL, &outif, &e);
- if (ro.ro_rt)
- RTFREE(ro.ro_rt); /* XXX: we could use this */
- if (src == NULL) {
- char ip6buf[INET6_ADDRSTRLEN];
- nd6log((LOG_DEBUG,
- "icmp6_reflect: source can't be determined: "
- "dst=%s, error=%d\n",
- ip6_sprintf(ip6buf, &sin6.sin6_addr), e));
- goto bad;
- }
- }
-
- ip6->ip6_src = *src;
- ip6->ip6_flow = 0;
- ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
- ip6->ip6_vfc |= IPV6_VERSION;
- ip6->ip6_nxt = IPPROTO_ICMPV6;
- if (outif)
- ip6->ip6_hlim = ND_IFINFO(outif)->chlim;
- else if (m->m_pkthdr.rcvif) {
- /* XXX: This may not be the outgoing interface */
- ip6->ip6_hlim = ND_IFINFO(m->m_pkthdr.rcvif)->chlim;
- } else
- ip6->ip6_hlim = ip6_defhlim;
-
- icmp6->icmp6_cksum = 0;
- icmp6->icmp6_cksum = in6_cksum(m, IPPROTO_ICMPV6,
- sizeof(struct ip6_hdr), plen);
-
- /*
- * XXX option handling
- */
-
- m->m_flags &= ~(M_BCAST|M_MCAST);
-
- ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
- if (outif)
- icmp6_ifoutstat_inc(outif, type, code);
-
- return;
-
- bad:
- m_freem(m);
- return;
-}
-
-void
-icmp6_fasttimo(void)
-{
-
- return;
-}
-
-static const char *
-icmp6_redirect_diag(struct in6_addr *src6, struct in6_addr *dst6,
- struct in6_addr *tgt6)
-{
- static char buf[1024];
- char ip6bufs[INET6_ADDRSTRLEN];
- char ip6bufd[INET6_ADDRSTRLEN];
- char ip6buft[INET6_ADDRSTRLEN];
- snprintf(buf, sizeof(buf), "(src=%s dst=%s tgt=%s)",
- ip6_sprintf(ip6bufs, src6), ip6_sprintf(ip6bufd, dst6),
- ip6_sprintf(ip6buft, tgt6));
- return buf;
-}
-
-void
-icmp6_redirect_input(struct mbuf *m, int off)
-{
- struct ifnet *ifp;
- struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
- struct nd_redirect *nd_rd;
- int icmp6len = ntohs(ip6->ip6_plen);
- char *lladdr = NULL;
- int lladdrlen = 0;
- u_char *redirhdr = NULL;
- int redirhdrlen = 0;
- struct rtentry *rt = NULL;
- int is_router;
- int is_onlink;
- struct in6_addr src6 = ip6->ip6_src;
- struct in6_addr redtgt6;
- struct in6_addr reddst6;
- union nd_opts ndopts;
- char ip6buf[INET6_ADDRSTRLEN];
-
- if (!m)
- return;
-
- ifp = m->m_pkthdr.rcvif;
-
- if (!ifp)
- return;
-
- /* XXX if we are router, we don't update route by icmp6 redirect */
- if (ip6_forwarding)
- goto freeit;
- if (!icmp6_rediraccept)
- goto freeit;
-
-#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, off, icmp6len,);
- nd_rd = (struct nd_redirect *)((caddr_t)ip6 + off);
-#else
- IP6_EXTHDR_GET(nd_rd, struct nd_redirect *, m, off, icmp6len);
- if (nd_rd == NULL) {
- icmp6stat.icp6s_tooshort++;
- return;
- }
-#endif
- redtgt6 = nd_rd->nd_rd_target;
- reddst6 = nd_rd->nd_rd_dst;
-
- if (in6_setscope(&redtgt6, m->m_pkthdr.rcvif, NULL) ||
- in6_setscope(&reddst6, m->m_pkthdr.rcvif, NULL)) {
- goto freeit;
- }
-
- /* validation */
- if (!IN6_IS_ADDR_LINKLOCAL(&src6)) {
- nd6log((LOG_ERR,
- "ICMP6 redirect sent from %s rejected; "
- "must be from linklocal\n",
- ip6_sprintf(ip6buf, &src6)));
- goto bad;
- }
- if (ip6->ip6_hlim != 255) {
- nd6log((LOG_ERR,
- "ICMP6 redirect sent from %s rejected; "
- "hlim=%d (must be 255)\n",
- ip6_sprintf(ip6buf, &src6), ip6->ip6_hlim));
- goto bad;
- }
- {
- /* ip6->ip6_src must be equal to gw for icmp6->icmp6_reddst */
- struct sockaddr_in6 sin6;
- struct in6_addr *gw6;
-
- bzero(&sin6, sizeof(sin6));
- sin6.sin6_family = AF_INET6;
- sin6.sin6_len = sizeof(struct sockaddr_in6);
- bcopy(&reddst6, &sin6.sin6_addr, sizeof(reddst6));
- rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL);
- if (rt) {
- if (rt->rt_gateway == NULL ||
- rt->rt_gateway->sa_family != AF_INET6) {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; no route "
- "with inet6 gateway found for redirect dst: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- RTFREE_LOCKED(rt);
- goto bad;
- }
-
- gw6 = &(((struct sockaddr_in6 *)rt->rt_gateway)->sin6_addr);
- if (bcmp(&src6, gw6, sizeof(struct in6_addr)) != 0) {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; "
- "not equal to gw-for-src=%s (must be same): "
- "%s\n",
- ip6_sprintf(ip6buf, gw6),
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- RTFREE_LOCKED(rt);
- goto bad;
- }
- } else {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; "
- "no route found for redirect dst: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- goto bad;
- }
- RTFREE_LOCKED(rt);
- rt = NULL;
- }
- if (IN6_IS_ADDR_MULTICAST(&reddst6)) {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; "
- "redirect dst must be unicast: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- goto bad;
- }
-
- is_router = is_onlink = 0;
- if (IN6_IS_ADDR_LINKLOCAL(&redtgt6))
- is_router = 1; /* router case */
- if (bcmp(&redtgt6, &reddst6, sizeof(redtgt6)) == 0)
- is_onlink = 1; /* on-link destination case */
- if (!is_router && !is_onlink) {
- nd6log((LOG_ERR,
- "ICMP6 redirect rejected; "
- "neither router case nor onlink case: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- goto bad;
- }
- /* validation passed */
-
- icmp6len -= sizeof(*nd_rd);
- nd6_option_init(nd_rd + 1, icmp6len, &ndopts);
- if (nd6_options(&ndopts) < 0) {
- nd6log((LOG_INFO, "icmp6_redirect_input: "
- "invalid ND option, rejected: %s\n",
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- /* nd6_options have incremented stats */
- goto freeit;
- }
-
- if (ndopts.nd_opts_tgt_lladdr) {
- lladdr = (char *)(ndopts.nd_opts_tgt_lladdr + 1);
- lladdrlen = ndopts.nd_opts_tgt_lladdr->nd_opt_len << 3;
- }
-
- if (ndopts.nd_opts_rh) {
- redirhdrlen = ndopts.nd_opts_rh->nd_opt_rh_len;
- redirhdr = (u_char *)(ndopts.nd_opts_rh + 1); /* xxx */
- }
-
- if (lladdr && ((ifp->if_addrlen + 2 + 7) & ~7) != lladdrlen) {
- nd6log((LOG_INFO,
- "icmp6_redirect_input: lladdrlen mismatch for %s "
- "(if %d, icmp6 packet %d): %s\n",
- ip6_sprintf(ip6buf, &redtgt6),
- ifp->if_addrlen, lladdrlen - 2,
- icmp6_redirect_diag(&src6, &reddst6, &redtgt6)));
- goto bad;
- }
-
- /* RFC 2461 8.3 */
- nd6_cache_lladdr(ifp, &redtgt6, lladdr, lladdrlen, ND_REDIRECT,
- is_onlink ? ND_REDIRECT_ONLINK : ND_REDIRECT_ROUTER);
-
- if (!is_onlink) { /* better router case. perform rtredirect. */
- /* perform rtredirect */
- struct sockaddr_in6 sdst;
- struct sockaddr_in6 sgw;
- struct sockaddr_in6 ssrc;
-
- bzero(&sdst, sizeof(sdst));
- bzero(&sgw, sizeof(sgw));
- bzero(&ssrc, sizeof(ssrc));
- sdst.sin6_family = sgw.sin6_family = ssrc.sin6_family = AF_INET6;
- sdst.sin6_len = sgw.sin6_len = ssrc.sin6_len =
- sizeof(struct sockaddr_in6);
- bcopy(&redtgt6, &sgw.sin6_addr, sizeof(struct in6_addr));
- bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
- bcopy(&src6, &ssrc.sin6_addr, sizeof(struct in6_addr));
- rtredirect((struct sockaddr *)&sdst, (struct sockaddr *)&sgw,
- (struct sockaddr *)NULL, RTF_GATEWAY | RTF_HOST,
- (struct sockaddr *)&ssrc);
- }
- /* finally update cached route in each socket via pfctlinput */
- {
- struct sockaddr_in6 sdst;
-
- bzero(&sdst, sizeof(sdst));
- sdst.sin6_family = AF_INET6;
- sdst.sin6_len = sizeof(struct sockaddr_in6);
- bcopy(&reddst6, &sdst.sin6_addr, sizeof(struct in6_addr));
- pfctlinput(PRC_REDIRECT_HOST, (struct sockaddr *)&sdst);
-#ifdef IPSEC
- key_sa_routechange((struct sockaddr *)&sdst);
-#endif /* IPSEC */
- }
-
- freeit:
- m_freem(m);
- return;
-
- bad:
- icmp6stat.icp6s_badredirect++;
- m_freem(m);
-}
-
-void
-icmp6_redirect_output(struct mbuf *m0, struct rtentry *rt)
-{
- struct ifnet *ifp; /* my outgoing interface */
- struct in6_addr *ifp_ll6;
- struct in6_addr *router_ll6;
- struct ip6_hdr *sip6; /* m0 as struct ip6_hdr */
- struct mbuf *m = NULL; /* newly allocated one */
- struct ip6_hdr *ip6; /* m as struct ip6_hdr */
- struct nd_redirect *nd_rd;
- size_t maxlen;
- u_char *p;
- struct ifnet *outif = NULL;
- struct sockaddr_in6 src_sa;
-
- icmp6_errcount(&icmp6stat.icp6s_outerrhist, ND_REDIRECT, 0);
-
- /* if we are not router, we don't send icmp6 redirect */
- if (!ip6_forwarding)
- goto fail;
-
- /* sanity check */
- if (!m0 || !rt || !(rt->rt_flags & RTF_UP) || !(ifp = rt->rt_ifp))
- goto fail;
-
- /*
- * Address check:
- * the source address must identify a neighbor, and
- * the destination address must not be a multicast address
- * [RFC 2461, sec 8.2]
- */
- sip6 = mtod(m0, struct ip6_hdr *);
- bzero(&src_sa, sizeof(src_sa));
- src_sa.sin6_family = AF_INET6;
- src_sa.sin6_len = sizeof(src_sa);
- src_sa.sin6_addr = sip6->ip6_src;
- if (nd6_is_addr_neighbor(&src_sa, ifp) == 0)
- goto fail;
- if (IN6_IS_ADDR_MULTICAST(&sip6->ip6_dst))
- goto fail; /* what should we do here? */
-
- /* rate limit */
- if (icmp6_ratelimit(&sip6->ip6_src, ND_REDIRECT, 0))
- goto fail;
-
- /*
- * Since we are going to append up to 1280 bytes (= IPV6_MMTU),
- * we almost always ask for an mbuf cluster for simplicity.
- * (MHLEN < IPV6_MMTU is almost always true)
- */
-#if IPV6_MMTU >= MCLBYTES
-# error assumption failed about IPV6_MMTU and MCLBYTES
-#endif
- MGETHDR(m, M_DONTWAIT, MT_HEADER);
- if (m && IPV6_MMTU >= MHLEN)
- MCLGET(m, M_DONTWAIT);
- if (!m)
- goto fail;
- m->m_pkthdr.rcvif = NULL;
- m->m_len = 0;
- maxlen = M_TRAILINGSPACE(m);
- maxlen = min(IPV6_MMTU, maxlen);
- /* just for safety */
- if (maxlen < sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr) +
- ((sizeof(struct nd_opt_hdr) + ifp->if_addrlen + 7) & ~7)) {
- goto fail;
- }
-
- {
- /* get ip6 linklocal address for ifp(my outgoing interface). */
- struct in6_ifaddr *ia;
- if ((ia = in6ifa_ifpforlinklocal(ifp,
- IN6_IFF_NOTREADY|
- IN6_IFF_ANYCAST)) == NULL)
- goto fail;
- ifp_ll6 = &ia->ia_addr.sin6_addr;
- }
-
- /* get ip6 linklocal address for the router. */
- if (rt->rt_gateway && (rt->rt_flags & RTF_GATEWAY)) {
- struct sockaddr_in6 *sin6;
- sin6 = (struct sockaddr_in6 *)rt->rt_gateway;
- router_ll6 = &sin6->sin6_addr;
- if (!IN6_IS_ADDR_LINKLOCAL(router_ll6))
- router_ll6 = (struct in6_addr *)NULL;
- } else
- router_ll6 = (struct in6_addr *)NULL;
-
- /* ip6 */
- ip6 = mtod(m, struct ip6_hdr *);
- ip6->ip6_flow = 0;
- ip6->ip6_vfc &= ~IPV6_VERSION_MASK;
- ip6->ip6_vfc |= IPV6_VERSION;
- /* ip6->ip6_plen will be set later */
- ip6->ip6_nxt = IPPROTO_ICMPV6;
- ip6->ip6_hlim = 255;
- /* ip6->ip6_src must be linklocal addr for my outgoing if. */
- bcopy(ifp_ll6, &ip6->ip6_src, sizeof(struct in6_addr));
- bcopy(&sip6->ip6_src, &ip6->ip6_dst, sizeof(struct in6_addr));
-
- /* ND Redirect */
- nd_rd = (struct nd_redirect *)(ip6 + 1);
- nd_rd->nd_rd_type = ND_REDIRECT;
- nd_rd->nd_rd_code = 0;
- nd_rd->nd_rd_reserved = 0;
- if (rt->rt_flags & RTF_GATEWAY) {
- /*
- * nd_rd->nd_rd_target must be a link-local address in
- * better router cases.
- */
- if (!router_ll6)
- goto fail;
- bcopy(router_ll6, &nd_rd->nd_rd_target,
- sizeof(nd_rd->nd_rd_target));
- bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
- sizeof(nd_rd->nd_rd_dst));
- } else {
- /* make sure redtgt == reddst */
- bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_target,
- sizeof(nd_rd->nd_rd_target));
- bcopy(&sip6->ip6_dst, &nd_rd->nd_rd_dst,
- sizeof(nd_rd->nd_rd_dst));
- }
-
- p = (u_char *)(nd_rd + 1);
-
- if (!router_ll6)
- goto nolladdropt;
-
- {
- /* target lladdr option */
- struct rtentry *rt_router = NULL;
- int len;
- struct sockaddr_dl *sdl;
- struct nd_opt_hdr *nd_opt;
- char *lladdr;
-
- rt_router = nd6_lookup(router_ll6, 0, ifp);
- if (!rt_router)
- goto nolladdropt;
- len = sizeof(*nd_opt) + ifp->if_addrlen;
- len = (len + 7) & ~7; /* round by 8 */
- /* safety check */
- if (len + (p - (u_char *)ip6) > maxlen)
- goto nolladdropt;
- if (!(rt_router->rt_flags & RTF_GATEWAY) &&
- (rt_router->rt_flags & RTF_LLINFO) &&
- (rt_router->rt_gateway->sa_family == AF_LINK) &&
- (sdl = (struct sockaddr_dl *)rt_router->rt_gateway) &&
- sdl->sdl_alen) {
- nd_opt = (struct nd_opt_hdr *)p;
- nd_opt->nd_opt_type = ND_OPT_TARGET_LINKADDR;
- nd_opt->nd_opt_len = len >> 3;
- lladdr = (char *)(nd_opt + 1);
- bcopy(LLADDR(sdl), lladdr, ifp->if_addrlen);
- p += len;
- }
- }
-nolladdropt:;
-
- m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
-
- /* just to be safe */
-#ifdef M_DECRYPTED /*not openbsd*/
- if (m0->m_flags & M_DECRYPTED)
- goto noredhdropt;
-#endif
- if (p - (u_char *)ip6 > maxlen)
- goto noredhdropt;
-
- {
- /* redirected header option */
- int len;
- struct nd_opt_rd_hdr *nd_opt_rh;
-
- /*
- * compute the maximum size for icmp6 redirect header option.
- * XXX room for auth header?
- */
- len = maxlen - (p - (u_char *)ip6);
- len &= ~7;
-
- /* This is just for simplicity. */
- if (m0->m_pkthdr.len != m0->m_len) {
- if (m0->m_next) {
- m_freem(m0->m_next);
- m0->m_next = NULL;
- }
- m0->m_pkthdr.len = m0->m_len;
- }
-
- /*
- * Redirected header option spec (RFC2461 4.6.3) talks nothing
- * about padding/truncate rule for the original IP packet.
- * From the discussion on IPv6imp in Feb 1999,
- * the consensus was:
- * - "attach as much as possible" is the goal
- * - pad if not aligned (original size can be guessed by
- * original ip6 header)
- * Following code adds the padding if it is simple enough,
- * and truncates if not.
- */
- if (m0->m_next || m0->m_pkthdr.len != m0->m_len)
- panic("assumption failed in %s:%d", __FILE__,
- __LINE__);
-
- if (len - sizeof(*nd_opt_rh) < m0->m_pkthdr.len) {
- /* not enough room, truncate */
- m0->m_pkthdr.len = m0->m_len = len -
- sizeof(*nd_opt_rh);
- } else {
- /* enough room, pad or truncate */
- size_t extra;
-
- extra = m0->m_pkthdr.len % 8;
- if (extra) {
- /* pad if easy enough, truncate if not */
- if (8 - extra <= M_TRAILINGSPACE(m0)) {
- /* pad */
- m0->m_len += (8 - extra);
- m0->m_pkthdr.len += (8 - extra);
- } else {
- /* truncate */
- m0->m_pkthdr.len -= extra;
- m0->m_len -= extra;
- }
- }
- len = m0->m_pkthdr.len + sizeof(*nd_opt_rh);
- m0->m_pkthdr.len = m0->m_len = len -
- sizeof(*nd_opt_rh);
- }
-
- nd_opt_rh = (struct nd_opt_rd_hdr *)p;
- bzero(nd_opt_rh, sizeof(*nd_opt_rh));
- nd_opt_rh->nd_opt_rh_type = ND_OPT_REDIRECTED_HEADER;
- nd_opt_rh->nd_opt_rh_len = len >> 3;
- p += sizeof(*nd_opt_rh);
- m->m_pkthdr.len = m->m_len = p - (u_char *)ip6;
-
- /* connect m0 to m */
- m_tag_delete_chain(m0, NULL);
- m0->m_flags &= ~M_PKTHDR;
- m->m_next = m0;
- m->m_pkthdr.len = m->m_len + m0->m_len;
- m0 = NULL;
- }
-noredhdropt:;
- if (m0) {
- m_freem(m0);
- m0 = NULL;
- }
-
- /* XXX: clear embedded link IDs in the inner header */
- in6_clearscope(&sip6->ip6_src);
- in6_clearscope(&sip6->ip6_dst);
- in6_clearscope(&nd_rd->nd_rd_target);
- in6_clearscope(&nd_rd->nd_rd_dst);
-
- ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
-
- nd_rd->nd_rd_cksum = 0;
- nd_rd->nd_rd_cksum = in6_cksum(m, IPPROTO_ICMPV6,
- sizeof(*ip6), ntohs(ip6->ip6_plen));
-
- /* send the packet to outside... */
- ip6_output(m, NULL, NULL, 0, NULL, &outif, NULL);
- if (outif) {
- icmp6_ifstat_inc(outif, ifs6_out_msg);
- icmp6_ifstat_inc(outif, ifs6_out_redirect);
- }
- icmp6stat.icp6s_outhist[ND_REDIRECT]++;
-
- return;
-
-fail:
- if (m)
- m_freem(m);
- if (m0)
- m_freem(m0);
-}
-
-/*
- * ICMPv6 socket option processing.
- */
-int
-icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
-{
- int error = 0;
- int optlen;
- struct inpcb *inp = sotoinpcb(so);
- int level, op, optname;
-
- if (sopt) {
- level = sopt->sopt_level;
- op = sopt->sopt_dir;
- optname = sopt->sopt_name;
- optlen = sopt->sopt_valsize;
- } else
- level = op = optname = optlen = 0;
-
- if (level != IPPROTO_ICMPV6) {
- return EINVAL;
- }
-
- switch (op) {
- case PRCO_SETOPT:
- switch (optname) {
- case ICMP6_FILTER:
- {
- struct icmp6_filter *p;
-
- if (optlen != sizeof(*p)) {
- error = EMSGSIZE;
- break;
- }
- if (inp->in6p_icmp6filt == NULL) {
- error = EINVAL;
- break;
- }
- error = sooptcopyin(sopt, inp->in6p_icmp6filt, optlen,
- optlen);
- break;
- }
-
- default:
- error = ENOPROTOOPT;
- break;
- }
- break;
-
- case PRCO_GETOPT:
- switch (optname) {
- case ICMP6_FILTER:
- {
- if (inp->in6p_icmp6filt == NULL) {
- error = EINVAL;
- break;
- }
- error = sooptcopyout(sopt, inp->in6p_icmp6filt,
- sizeof(struct icmp6_filter));
- break;
- }
-
- default:
- error = ENOPROTOOPT;
- break;
- }
- break;
- }
-
- return (error);
-}
-
-/*
- * Perform rate limit check.
- * Returns 0 if it is okay to send the icmp6 packet.
- * Returns 1 if the router SHOULD NOT send this icmp6 packet due to rate
- * limitation.
- *
- * XXX per-destination/type check necessary?
- *
- * dst - not used at this moment
- * type - not used at this moment
- * code - not used at this moment
- */
-static int
-icmp6_ratelimit(const struct in6_addr *dst, const int type,
- const int code)
-{
- int ret;
-
- ret = 0; /* okay to send */
-
- /* PPS limit */
- if (!ppsratecheck(&icmp6errppslim_last, &icmp6errpps_count,
- icmp6errppslim)) {
- /* The packet is subject to rate limit */
- ret++;
- }
-
- return ret;
-}
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