Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/netinet6/ip6_input.c,v rcsdiff: /ftp/cvs/cvsroot/src/sys/netinet6/ip6_input.c,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.109.8.1 retrieving revision 1.109.8.2 diff -u -p -r1.109.8.1 -r1.109.8.2 --- src/sys/netinet6/ip6_input.c 2007/07/19 20:48:56 1.109.8.1 +++ src/sys/netinet6/ip6_input.c 2007/07/19 20:48:57 1.109.8.2 @@ -0,0 +1,1926 @@ +/* $NetBSD: ip6_input.c,v 1.109.8.2 2007/07/19 20:48:57 dyoung Exp $ */ +/* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 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. + * 3. 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_input.c 8.2 (Berkeley) 1/4/94 + */ + +#include +__KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.109.8.2 2007/07/19 20:48:57 dyoung Exp $"); + +#include "opt_inet.h" +#include "opt_inet6.h" +#include "opt_ipsec.h" +#include "opt_pfil_hooks.h" + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#ifdef PFIL_HOOKS +#include +#endif + +#include +#include +#ifdef INET +#include +#include +#endif /* INET */ +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef IPSEC +#include +#endif + +#ifdef FAST_IPSEC +#include +#include +#include +#endif /* FAST_IPSEC */ + +#include + +#include "faith.h" +#include "gif.h" + +#if NGIF > 0 +#include +#endif + +#include + +extern struct domain inet6domain; + +u_char ip6_protox[IPPROTO_MAX]; +static int ip6qmaxlen = IFQ_MAXLEN; +struct in6_ifaddr *in6_ifaddr; +struct ifqueue ip6intrq; + +extern callout_t in6_tmpaddrtimer_ch; + +int ip6_forward_srcrt; /* XXX */ +int ip6_sourcecheck; /* XXX */ +int ip6_sourcecheck_interval; /* XXX */ + +#ifdef PFIL_HOOKS +struct pfil_head inet6_pfil_hook; +#endif + +struct ip6stat ip6stat; + +static void ip6_init2 __P((void *)); +static struct m_tag *ip6_setdstifaddr __P((struct mbuf *, struct in6_ifaddr *)); + +static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *)); +static struct mbuf *ip6_pullexthdr __P((struct mbuf *, size_t, int)); + +/* + * IP6 initialization: fill in IP6 protocol switch table. + * All protocols not implemented in kernel go to raw IP6 protocol handler. + */ +void +ip6_init() +{ + const struct ip6protosw *pr; + int i; + + pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); + if (pr == 0) + panic("ip6_init"); + for (i = 0; i < IPPROTO_MAX; i++) + ip6_protox[i] = pr - inet6sw; + for (pr = (const struct ip6protosw *)inet6domain.dom_protosw; + pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) + if (pr->pr_domain->dom_family == PF_INET6 && + pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) + ip6_protox[pr->pr_protocol] = pr - inet6sw; + ip6intrq.ifq_maxlen = ip6qmaxlen; + scope6_init(); + addrsel_policy_init(); + nd6_init(); + frag6_init(); + ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; + + ip6_init2((void *)0); +#ifdef GATEWAY + ip6flow_init(ip6_hashsize); +#endif + +#ifdef PFIL_HOOKS + /* Register our Packet Filter hook. */ + inet6_pfil_hook.ph_type = PFIL_TYPE_AF; + inet6_pfil_hook.ph_af = AF_INET6; + i = pfil_head_register(&inet6_pfil_hook); + if (i != 0) + printf("ip6_init: WARNING: unable to register pfil hook, " + "error %d\n", i); +#endif /* PFIL_HOOKS */ +} + +static void +ip6_init2(void *dummy) +{ + + /* nd6_timer_init */ + callout_init(&nd6_timer_ch, 0); + callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL); + + /* timer for regeneranation of temporary addresses randomize ID */ + callout_init(&in6_tmpaddrtimer_ch, 0); + callout_reset(&in6_tmpaddrtimer_ch, + (ip6_temp_preferred_lifetime - ip6_desync_factor - + ip6_temp_regen_advance) * hz, + in6_tmpaddrtimer, NULL); +} + +/* + * IP6 input interrupt handling. Just pass the packet to ip6_input. + */ +void +ip6intr() +{ + int s; + struct mbuf *m; + + for (;;) { + s = splnet(); + IF_DEQUEUE(&ip6intrq, m); + splx(s); + if (m == 0) + return; + /* drop the packet if IPv6 operation is disabled on the IF */ + if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { + m_freem(m); + return; + } + ip6_input(m); + } +} + +extern struct route ip6_forward_rt; + +void +ip6_input(struct mbuf *m) +{ + struct ip6_hdr *ip6; + int hit, off = sizeof(struct ip6_hdr), nest; + u_int32_t plen; + u_int32_t rtalert = ~0; + int nxt, ours = 0, rh_present = 0; + struct ifnet *deliverifp = NULL; + int srcrt = 0; + const struct rtentry *rt; + union { + struct sockaddr dst; + struct sockaddr_in6 dst6; + } u; +#ifdef FAST_IPSEC + struct m_tag *mtag; + struct tdb_ident *tdbi; + struct secpolicy *sp; + int s, error; +#endif + +#ifdef IPSEC + /* + * should the inner packet be considered authentic? + * see comment in ah4_input(). + */ + m->m_flags &= ~M_AUTHIPHDR; + m->m_flags &= ~M_AUTHIPDGM; +#endif + + /* + * make sure we don't have onion peering information into m_tag. + */ + ip6_delaux(m); + + /* + * mbuf statistics + */ + if (m->m_flags & M_EXT) { + if (m->m_next) + ip6stat.ip6s_mext2m++; + else + ip6stat.ip6s_mext1++; + } else { +#define M2MMAX __arraycount(ip6stat.ip6s_m2m) + if (m->m_next) { + if (m->m_flags & M_LOOP) { + ip6stat.ip6s_m2m[lo0ifp->if_index]++; /* XXX */ + } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) + ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++; + else + ip6stat.ip6s_m2m[0]++; + } else + ip6stat.ip6s_m1++; +#undef M2MMAX + } + + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); + ip6stat.ip6s_total++; + + /* + * If the IPv6 header is not aligned, slurp it up into a new + * mbuf with space for link headers, in the event we forward + * it. Otherwise, if it is aligned, make sure the entire base + * IPv6 header is in the first mbuf of the chain. + */ + if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) { + struct ifnet *inifp = m->m_pkthdr.rcvif; + if ((m = m_copyup(m, sizeof(struct ip6_hdr), + (max_linkhdr + 3) & ~3)) == NULL) { + /* XXXJRT new stat, please */ + ip6stat.ip6s_toosmall++; + in6_ifstat_inc(inifp, ifs6_in_hdrerr); + return; + } + } else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) { + struct ifnet *inifp = m->m_pkthdr.rcvif; + if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { + ip6stat.ip6s_toosmall++; + in6_ifstat_inc(inifp, ifs6_in_hdrerr); + return; + } + } + + ip6 = mtod(m, struct ip6_hdr *); + + if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { + ip6stat.ip6s_badvers++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); + goto bad; + } + +#if defined(IPSEC) + /* IPv6 fast forwarding is not compatible with IPsec. */ + m->m_flags &= ~M_CANFASTFWD; +#else + /* + * Assume that we can create a fast-forward IP flow entry + * based on this packet. + */ + m->m_flags |= M_CANFASTFWD; +#endif + +#ifdef PFIL_HOOKS + /* + * Run through list of hooks for input packets. If there are any + * filters which require that additional packets in the flow are + * not fast-forwarded, they must clear the M_CANFASTFWD flag. + * Note that filters must _never_ set this flag, as another filter + * in the list may have previously cleared it. + */ + /* + * let ipfilter look at packet on the wire, + * not the decapsulated packet. + */ +#ifdef IPSEC + if (!ipsec_getnhist(m)) +#elif defined(FAST_IPSEC) + if (!ipsec_indone(m)) +#else + if (1) +#endif + { + struct in6_addr odst; + + odst = ip6->ip6_dst; + if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif, + PFIL_IN) != 0) + return; + if (m == NULL) + return; + ip6 = mtod(m, struct ip6_hdr *); + srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); + } +#endif /* PFIL_HOOKS */ + + ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; + +#ifdef ALTQ + if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { + /* packet is dropped by traffic conditioner */ + return; + } +#endif + + /* + * Check against address spoofing/corruption. + */ + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || + IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { + /* + * XXX: "badscope" is not very suitable for a multicast source. + */ + ip6stat.ip6s_badscope++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); + goto bad; + } + /* + * The following check is not documented in specs. A malicious + * party may be able to use IPv4 mapped addr to confuse tcp/udp stack + * and bypass security checks (act as if it was from 127.0.0.1 by using + * IPv6 src ::ffff:127.0.0.1). Be cautious. + * + * This check chokes if we are in an SIIT cloud. As none of BSDs + * support IPv4-less kernel compilation, we cannot support SIIT + * environment at all. So, it makes more sense for us to reject any + * malicious packets for non-SIIT environment, than try to do a + * partial support for SIIT environment. + */ + if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || + IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { + ip6stat.ip6s_badscope++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); + goto bad; + } +#if 0 + /* + * Reject packets with IPv4 compatible addresses (auto tunnel). + * + * The code forbids auto tunnel relay case in RFC1933 (the check is + * stronger than RFC1933). We may want to re-enable it if mech-xx + * is revised to forbid relaying case. + */ + if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || + IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { + ip6stat.ip6s_badscope++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); + goto bad; + } +#endif + + /* + * Disambiguate address scope zones (if there is ambiguity). + * We first make sure that the original source or destination address + * is not in our internal form for scoped addresses. Such addresses + * are not necessarily invalid spec-wise, but we cannot accept them due + * to the usage conflict. + * in6_setscope() then also checks and rejects the cases where src or + * dst are the loopback address and the receiving interface + * is not loopback. + */ + if (__predict_false( + m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT))) + goto bad; + ip6 = mtod(m, struct ip6_hdr *); + if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { + ip6stat.ip6s_badscope++; /* XXX */ + goto bad; + } + if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || + in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { + ip6stat.ip6s_badscope++; + goto bad; + } + + /* + * Multicast check + */ + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { + struct in6_multi *in6m = 0; + + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); + /* + * See if we belong to the destination multicast group on the + * arrival interface. + */ + IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m); + if (in6m) + ours = 1; + else if (!ip6_mrouter) { + ip6stat.ip6s_notmember++; + ip6stat.ip6s_cantforward++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); + goto bad; + } + deliverifp = m->m_pkthdr.rcvif; + goto hbhcheck; + } + + sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); + + /* + * Unicast check + */ + rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit); + if (hit) + ip6stat.ip6s_forward_cachehit++; + else + ip6stat.ip6s_forward_cachemiss++; + +#define rt6_getkey(__rt) satocsin6(rt_getkey(__rt)) + + /* + * Accept the packet if the forwarding interface to the destination + * according to the routing table is the loopback interface, + * unless the associated route has a gateway. + * Note that this approach causes to accept a packet if there is a + * route to the loopback interface for the destination of the packet. + * But we think it's even useful in some situations, e.g. when using + * a special daemon which wants to intercept the packet. + */ + if (rt != NULL && + (rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && + !(rt->rt_flags & RTF_CLONED) && +#if 0 + /* + * The check below is redundant since the comparison of + * the destination and the key of the rtentry has + * already done through looking up the routing table. + */ + IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) && +#endif + rt->rt_ifp->if_type == IFT_LOOP) { + struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; + if (ia6->ia6_flags & IN6_IFF_ANYCAST) + m->m_flags |= M_ANYCAST6; + /* + * packets to a tentative, duplicated, or somehow invalid + * address must not be accepted. + */ + if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { + /* this address is ready */ + ours = 1; + deliverifp = ia6->ia_ifp; /* correct? */ + goto hbhcheck; + } else { + /* address is not ready, so discard the packet. */ + nd6log((LOG_INFO, + "ip6_input: packet to an unready address %s->%s\n", + ip6_sprintf(&ip6->ip6_src), + ip6_sprintf(&ip6->ip6_dst))); + + goto bad; + } + } + + /* + * FAITH (Firewall Aided Internet Translator) + */ +#if defined(NFAITH) && 0 < NFAITH + if (ip6_keepfaith) { + if (rt != NULL && rt->rt_ifp != NULL && + rt->rt_ifp->if_type == IFT_FAITH) { + /* XXX do we need more sanity checks? */ + ours = 1; + deliverifp = rt->rt_ifp; /* faith */ + goto hbhcheck; + } + } +#endif + +#if 0 + { + /* + * Last resort: check in6_ifaddr for incoming interface. + * The code is here until I update the "goto ours hack" code above + * working right. + */ + struct ifaddr *ifa; + TAILQ_FOREACH(ifa, &m->m_pkthdr.rcvif->if_addrlist, ifa_list) { + if (ifa->ifa_addr == NULL) + continue; /* just for safety */ + if (ifa->ifa_addr->sa_family != AF_INET6) + continue; + if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) { + ours = 1; + deliverifp = ifa->ifa_ifp; + goto hbhcheck; + } + } + } +#endif + + /* + * Now there is no reason to process the packet if it's not our own + * and we're not a router. + */ + if (!ip6_forwarding) { + ip6stat.ip6s_cantforward++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); + goto bad; + } + + hbhcheck: + /* + * record address information into m_tag, if we don't have one yet. + * note that we are unable to record it, if the address is not listed + * as our interface address (e.g. multicast addresses, addresses + * within FAITH prefixes and such). + */ + if (deliverifp && !ip6_getdstifaddr(m)) { + struct in6_ifaddr *ia6; + + ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); + if (ia6) { + if (!ip6_setdstifaddr(m, ia6)) { + /* + * XXX maybe we should drop the packet here, + * as we could not provide enough information + * to the upper layers. + */ + } + } + } + + /* + * Process Hop-by-Hop options header if it's contained. + * m may be modified in ip6_hopopts_input(). + * If a JumboPayload option is included, plen will also be modified. + */ + plen = (u_int32_t)ntohs(ip6->ip6_plen); + if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { + struct ip6_hbh *hbh; + + if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { +#if 0 /*touches NULL pointer*/ + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); +#endif + return; /* m have already been freed */ + } + + /* adjust pointer */ + ip6 = mtod(m, struct ip6_hdr *); + + /* + * if the payload length field is 0 and the next header field + * indicates Hop-by-Hop Options header, then a Jumbo Payload + * option MUST be included. + */ + if (ip6->ip6_plen == 0 && plen == 0) { + /* + * Note that if a valid jumbo payload option is + * contained, ip6_hopopts_input() must set a valid + * (non-zero) payload length to the variable plen. + */ + ip6stat.ip6s_badoptions++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + (char *)&ip6->ip6_plen - (char *)ip6); + return; + } + IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), + sizeof(struct ip6_hbh)); + if (hbh == NULL) { + ip6stat.ip6s_tooshort++; + return; + } + KASSERT(IP6_HDR_ALIGNED_P(hbh)); + nxt = hbh->ip6h_nxt; + + /* + * accept the packet if a router alert option is included + * and we act as an IPv6 router. + */ + if (rtalert != ~0 && ip6_forwarding) + ours = 1; + } else + nxt = ip6->ip6_nxt; + + /* + * Check that the amount of data in the buffers + * is as at least much as the IPv6 header would have us expect. + * Trim mbufs if longer than we expect. + * Drop packet if shorter than we expect. + */ + if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { + ip6stat.ip6s_tooshort++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); + goto bad; + } + if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { + if (m->m_len == m->m_pkthdr.len) { + m->m_len = sizeof(struct ip6_hdr) + plen; + m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; + } else + m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); + } + + /* + * Forward if desirable. + */ + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { + /* + * If we are acting as a multicast router, all + * incoming multicast packets are passed to the + * kernel-level multicast forwarding function. + * The packet is returned (relatively) intact; if + * ip6_mforward() returns a non-zero value, the packet + * must be discarded, else it may be accepted below. + */ + if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { + ip6stat.ip6s_cantforward++; + m_freem(m); + return; + } + if (!ours) { + m_freem(m); + return; + } + } else if (!ours) { + ip6_forward(m, srcrt); + return; + } + + ip6 = mtod(m, struct ip6_hdr *); + + /* + * Malicious party may be able to use IPv4 mapped addr to confuse + * tcp/udp stack and bypass security checks (act as if it was from + * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. + * + * For SIIT end node behavior, you may want to disable the check. + * However, you will become vulnerable to attacks using IPv4 mapped + * source. + */ + if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || + IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { + ip6stat.ip6s_badscope++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); + goto bad; + } + + /* + * Tell launch routine the next header + */ +#ifdef IFA_STATS + if (deliverifp != NULL) { + struct in6_ifaddr *ia6; + ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); + if (ia6) + ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; + } +#endif + ip6stat.ip6s_delivered++; + in6_ifstat_inc(deliverifp, ifs6_in_deliver); + nest = 0; + + rh_present = 0; + while (nxt != IPPROTO_DONE) { + if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { + ip6stat.ip6s_toomanyhdr++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); + goto bad; + } + + /* + * protection against faulty packet - there should be + * more sanity checks in header chain processing. + */ + if (m->m_pkthdr.len < off) { + ip6stat.ip6s_tooshort++; + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); + goto bad; + } + + if (nxt == IPPROTO_ROUTING) { + if (rh_present++) { + in6_ifstat_inc(m->m_pkthdr.rcvif, + ifs6_in_hdrerr); + ip6stat.ip6s_badoptions++; + goto bad; + } + } + +#ifdef IPSEC + /* + * enforce IPsec policy checking if we are seeing last header. + * note that we do not visit this with protocols with pcb layer + * code - like udp/tcp/raw ip. + */ + if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 && + ipsec6_in_reject(m, NULL)) { + ipsec6stat.in_polvio++; + goto bad; + } +#endif +#ifdef FAST_IPSEC + /* + * enforce IPsec policy checking if we are seeing last header. + * note that we do not visit this with protocols with pcb layer + * code - like udp/tcp/raw ip. + */ + if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) { + /* + * Check if the packet has already had IPsec processing + * done. If so, then just pass it along. This tag gets + * set during AH, ESP, etc. input handling, before the + * packet is returned to the ip input queue for delivery. + */ + mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); + s = splsoftnet(); + if (mtag != NULL) { + tdbi = (struct tdb_ident *)(mtag + 1); + sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND); + } else { + sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND, + IP_FORWARDING, &error); + } + if (sp != NULL) { + /* + * Check security policy against packet attributes. + */ + error = ipsec_in_reject(sp, m); + KEY_FREESP(&sp); + } else { + /* XXX error stat??? */ + error = EINVAL; + DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/ + goto bad; + } + splx(s); + if (error) + goto bad; + } +#endif /* FAST_IPSEC */ + + + nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); + } + return; + bad: + m_freem(m); +} + +/* + * set/grab in6_ifaddr correspond to IPv6 destination address. + */ +static struct m_tag * +ip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) +{ + struct m_tag *mtag; + + mtag = ip6_addaux(m); + if (mtag) + ((struct ip6aux *)(mtag + 1))->ip6a_dstia6 = ia6; + return mtag; /* NULL if failed to set */ +} + +struct in6_ifaddr * +ip6_getdstifaddr(struct mbuf *m) +{ + struct m_tag *mtag; + + mtag = ip6_findaux(m); + if (mtag) + return ((struct ip6aux *)(mtag + 1))->ip6a_dstia6; + else + return NULL; +} + +/* + * Hop-by-Hop options header processing. If a valid jumbo payload option is + * included, the real payload length will be stored in plenp. + * + * rtalertp - XXX: should be stored more smart way + */ +static int +ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, + struct mbuf **mp, int *offp) +{ + struct mbuf *m = *mp; + int off = *offp, hbhlen; + struct ip6_hbh *hbh; + + /* validation of the length of the header */ + IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, + sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); + if (hbh == NULL) { + ip6stat.ip6s_tooshort++; + return -1; + } + hbhlen = (hbh->ip6h_len + 1) << 3; + IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), + hbhlen); + if (hbh == NULL) { + ip6stat.ip6s_tooshort++; + return -1; + } + KASSERT(IP6_HDR_ALIGNED_P(hbh)); + off += hbhlen; + hbhlen -= sizeof(struct ip6_hbh); + + if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), + hbhlen, rtalertp, plenp) < 0) + return (-1); + + *offp = off; + *mp = m; + return (0); +} + +/* + * Search header for all Hop-by-hop options and process each option. + * This function is separate from ip6_hopopts_input() in order to + * handle a case where the sending node itself process its hop-by-hop + * options header. In such a case, the function is called from ip6_output(). + * + * The function assumes that hbh header is located right after the IPv6 header + * (RFC2460 p7), opthead is pointer into data content in m, and opthead to + * opthead + hbhlen is located in continuous memory region. + */ +int +ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, + u_int32_t *rtalertp, u_int32_t *plenp) +{ + struct ip6_hdr *ip6; + int optlen = 0; + u_int8_t *opt = opthead; + u_int16_t rtalert_val; + u_int32_t jumboplen; + const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); + + for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { + switch (*opt) { + case IP6OPT_PAD1: + optlen = 1; + break; + case IP6OPT_PADN: + if (hbhlen < IP6OPT_MINLEN) { + ip6stat.ip6s_toosmall++; + goto bad; + } + optlen = *(opt + 1) + 2; + break; + case IP6OPT_RTALERT: + /* XXX may need check for alignment */ + if (hbhlen < IP6OPT_RTALERT_LEN) { + ip6stat.ip6s_toosmall++; + goto bad; + } + if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { + /* XXX stat */ + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + erroff + opt + 1 - opthead); + return (-1); + } + optlen = IP6OPT_RTALERT_LEN; + bcopy((void *)(opt + 2), (void *)&rtalert_val, 2); + *rtalertp = ntohs(rtalert_val); + break; + case IP6OPT_JUMBO: + /* XXX may need check for alignment */ + if (hbhlen < IP6OPT_JUMBO_LEN) { + ip6stat.ip6s_toosmall++; + goto bad; + } + if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { + /* XXX stat */ + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + erroff + opt + 1 - opthead); + return (-1); + } + optlen = IP6OPT_JUMBO_LEN; + + /* + * IPv6 packets that have non 0 payload length + * must not contain a jumbo payload option. + */ + ip6 = mtod(m, struct ip6_hdr *); + if (ip6->ip6_plen) { + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + erroff + opt - opthead); + return (-1); + } + + /* + * We may see jumbolen in unaligned location, so + * we'd need to perform bcopy(). + */ + bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); + jumboplen = (u_int32_t)htonl(jumboplen); + +#if 1 + /* + * if there are multiple jumbo payload options, + * *plenp will be non-zero and the packet will be + * rejected. + * the behavior may need some debate in ipngwg - + * multiple options does not make sense, however, + * there's no explicit mention in specification. + */ + if (*plenp != 0) { + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + erroff + opt + 2 - opthead); + return (-1); + } +#endif + + /* + * jumbo payload length must be larger than 65535. + */ + if (jumboplen <= IPV6_MAXPACKET) { + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_HEADER, + erroff + opt + 2 - opthead); + return (-1); + } + *plenp = jumboplen; + + break; + default: /* unknown option */ + if (hbhlen < IP6OPT_MINLEN) { + ip6stat.ip6s_toosmall++; + goto bad; + } + optlen = ip6_unknown_opt(opt, m, + erroff + opt - opthead); + if (optlen == -1) + return (-1); + optlen += 2; + break; + } + } + + return (0); + + bad: + m_freem(m); + return (-1); +} + +/* + * Unknown option processing. + * The third argument `off' is the offset from the IPv6 header to the option, + * which is necessary if the IPv6 header the and option header and IPv6 header + * is not continuous in order to return an ICMPv6 error. + */ +int +ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) +{ + struct ip6_hdr *ip6; + + switch (IP6OPT_TYPE(*optp)) { + case IP6OPT_TYPE_SKIP: /* ignore the option */ + return ((int)*(optp + 1)); + case IP6OPT_TYPE_DISCARD: /* silently discard */ + m_freem(m); + return (-1); + case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ + ip6stat.ip6s_badoptions++; + icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); + return (-1); + case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ + ip6stat.ip6s_badoptions++; + ip6 = mtod(m, struct ip6_hdr *); + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || + (m->m_flags & (M_BCAST|M_MCAST))) + m_freem(m); + else + icmp6_error(m, ICMP6_PARAM_PROB, + ICMP6_PARAMPROB_OPTION, off); + return (-1); + } + + m_freem(m); /* XXX: NOTREACHED */ + return (-1); +} + +/* + * Create the "control" list for this pcb. + * + * The routine will be called from upper layer handlers like tcp6_input(). + * Thus the routine assumes that the caller (tcp6_input) have already + * called IP6_EXTHDR_CHECK() and all the extension headers are located in the + * very first mbuf on the mbuf chain. + * We may want to add some infinite loop prevention or sanity checks for safety. + * (This applies only when you are using KAME mbuf chain restriction, i.e. + * you are using IP6_EXTHDR_CHECK() not m_pulldown()) + */ +void +ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp, + struct ip6_hdr *ip6, struct mbuf *m) +{ +#ifdef RFC2292 +#define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) +#else +#define IS2292(x, y) (y) +#endif + +#ifdef SO_TIMESTAMP + if (in6p->in6p_socket->so_options & SO_TIMESTAMP) { + struct timeval tv; + + microtime(&tv); + *mp = sbcreatecontrol((void *) &tv, sizeof(tv), + SCM_TIMESTAMP, SOL_SOCKET); + if (*mp) + mp = &(*mp)->m_next; + } +#endif + + /* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */ + if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) + return; + + /* RFC 2292 sec. 5 */ + if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) { + struct in6_pktinfo pi6; + + bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); + in6_clearscope(&pi6.ipi6_addr); /* XXX */ + pi6.ipi6_ifindex = m->m_pkthdr.rcvif ? + m->m_pkthdr.rcvif->if_index : 0; + *mp = sbcreatecontrol((void *) &pi6, + sizeof(struct in6_pktinfo), + IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + } + + if (in6p->in6p_flags & IN6P_HOPLIMIT) { + int hlim = ip6->ip6_hlim & 0xff; + + *mp = sbcreatecontrol((void *) &hlim, sizeof(int), + IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + } + + if ((in6p->in6p_flags & IN6P_TCLASS) != 0) { + u_int32_t flowinfo; + int tclass; + + flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); + flowinfo >>= 20; + + tclass = flowinfo & 0xff; + *mp = sbcreatecontrol((void *)&tclass, sizeof(tclass), + IPV6_TCLASS, IPPROTO_IPV6); + + if (*mp) + mp = &(*mp)->m_next; + } + + /* + * IPV6_HOPOPTS socket option. Recall that we required super-user + * privilege for the option (see ip6_ctloutput), but it might be too + * strict, since there might be some hop-by-hop options which can be + * returned to normal user. + * See also RFC3542 section 8 (or RFC2292 section 6). + */ + if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) { + /* + * Check if a hop-by-hop options header is contatined in the + * received packet, and if so, store the options as ancillary + * data. Note that a hop-by-hop options header must be + * just after the IPv6 header, which fact is assured through + * the IPv6 input processing. + */ + struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); + if (xip6->ip6_nxt == IPPROTO_HOPOPTS) { + struct ip6_hbh *hbh; + int hbhlen; + struct mbuf *ext; + + ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), + xip6->ip6_nxt); + if (ext == NULL) { + ip6stat.ip6s_tooshort++; + return; + } + hbh = mtod(ext, struct ip6_hbh *); + hbhlen = (hbh->ip6h_len + 1) << 3; + if (hbhlen != ext->m_len) { + m_freem(ext); + ip6stat.ip6s_tooshort++; + return; + } + + /* + * XXX: We copy whole the header even if a jumbo + * payload option is included, which option is to + * be removed before returning in the RFC 2292. + * Note: this constraint is removed in RFC3542. + */ + *mp = sbcreatecontrol((void *)hbh, hbhlen, + IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS), + IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + m_freem(ext); + } + } + + /* IPV6_DSTOPTS and IPV6_RTHDR socket options */ + if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) { + struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *); + int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr); + + /* + * Search for destination options headers or routing + * header(s) through the header chain, and stores each + * header as ancillary data. + * Note that the order of the headers remains in + * the chain of ancillary data. + */ + for (;;) { /* is explicit loop prevention necessary? */ + struct ip6_ext *ip6e = NULL; + int elen; + struct mbuf *ext = NULL; + + /* + * if it is not an extension header, don't try to + * pull it from the chain. + */ + switch (nxt) { + case IPPROTO_DSTOPTS: + case IPPROTO_ROUTING: + case IPPROTO_HOPOPTS: + case IPPROTO_AH: /* is it possible? */ + break; + default: + goto loopend; + } + + ext = ip6_pullexthdr(m, off, nxt); + if (ext == NULL) { + ip6stat.ip6s_tooshort++; + return; + } + ip6e = mtod(ext, struct ip6_ext *); + if (nxt == IPPROTO_AH) + elen = (ip6e->ip6e_len + 2) << 2; + else + elen = (ip6e->ip6e_len + 1) << 3; + if (elen != ext->m_len) { + m_freem(ext); + ip6stat.ip6s_tooshort++; + return; + } + KASSERT(IP6_HDR_ALIGNED_P(ip6e)); + + switch (nxt) { + case IPPROTO_DSTOPTS: + if (!in6p->in6p_flags & IN6P_DSTOPTS) + break; + + *mp = sbcreatecontrol((void *)ip6e, elen, + IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), + IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + break; + + case IPPROTO_ROUTING: + if (!in6p->in6p_flags & IN6P_RTHDR) + break; + + *mp = sbcreatecontrol((void *)ip6e, elen, + IS2292(IPV6_2292RTHDR, IPV6_RTHDR), + IPPROTO_IPV6); + if (*mp) + mp = &(*mp)->m_next; + break; + + case IPPROTO_HOPOPTS: + case IPPROTO_AH: /* is it possible? */ + break; + + default: + /* + * other cases have been filtered in the above. + * none will visit this case. here we supply + * the code just in case (nxt overwritten or + * other cases). + */ + m_freem(ext); + goto loopend; + + } + + /* proceed with the next header. */ + off += elen; + nxt = ip6e->ip6e_nxt; + ip6e = NULL; + m_freem(ext); + ext = NULL; + } + loopend: + ; + } +} +#undef IS2292 + + +void +ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst, + uint32_t *mtu) +{ + struct socket *so; + struct mbuf *m_mtu; + struct ip6_mtuinfo mtuctl; + + so = in6p->in6p_socket; + + if (mtu == NULL) + return; + +#ifdef DIAGNOSTIC + if (so == NULL) /* I believe this is impossible */ + panic("ip6_notify_pmtu: socket is NULL"); +#endif + + memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */ + mtuctl.ip6m_mtu = *mtu; + mtuctl.ip6m_addr = *dst; + if (sa6_recoverscope(&mtuctl.ip6m_addr)) + return; + + if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl), + IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) + return; + + if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) + == 0) { + m_freem(m_mtu); + /* XXX: should count statistics */ + } else + sorwakeup(so); + + return; +} + +/* + * pull single extension header from mbuf chain. returns single mbuf that + * contains the result, or NULL on error. + */ +static struct mbuf * +ip6_pullexthdr(struct mbuf *m, size_t off, int nxt) +{ + struct ip6_ext ip6e; + size_t elen; + struct mbuf *n; + +#ifdef DIAGNOSTIC + switch (nxt) { + case IPPROTO_DSTOPTS: + case IPPROTO_ROUTING: + case IPPROTO_HOPOPTS: + case IPPROTO_AH: /* is it possible? */ + break; + default: + printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); + } +#endif + + m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); + if (nxt == IPPROTO_AH) + elen = (ip6e.ip6e_len + 2) << 2; + else + elen = (ip6e.ip6e_len + 1) << 3; + + MGET(n, M_DONTWAIT, MT_DATA); + if (n && elen >= MLEN) { + MCLGET(n, M_DONTWAIT); + if ((n->m_flags & M_EXT) == 0) { + m_free(n); + n = NULL; + } + } + if (!n) + return NULL; + + n->m_len = 0; + if (elen >= M_TRAILINGSPACE(n)) { + m_free(n); + return NULL; + } + + m_copydata(m, off, elen, mtod(n, void *)); + n->m_len = elen; + return n; +} + +/* + * Get pointer to the previous header followed by the header + * currently processed. + * XXX: This function supposes that + * M includes all headers, + * the next header field and the header length field of each header + * are valid, and + * the sum of each header length equals to OFF. + * Because of these assumptions, this function must be called very + * carefully. Moreover, it will not be used in the near future when + * we develop `neater' mechanism to process extension headers. + */ +u_int8_t * +ip6_get_prevhdr(struct mbuf *m, int off) +{ + struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); + + if (off == sizeof(struct ip6_hdr)) + return (&ip6->ip6_nxt); + else { + int len, nxt; + struct ip6_ext *ip6e = NULL; + + nxt = ip6->ip6_nxt; + len = sizeof(struct ip6_hdr); + while (len < off) { + ip6e = (struct ip6_ext *)(mtod(m, char *) + len); + + switch (nxt) { + case IPPROTO_FRAGMENT: + len += sizeof(struct ip6_frag); + break; + case IPPROTO_AH: + len += (ip6e->ip6e_len + 2) << 2; + break; + default: + len += (ip6e->ip6e_len + 1) << 3; + break; + } + nxt = ip6e->ip6e_nxt; + } + if (ip6e) + return (&ip6e->ip6e_nxt); + else + return NULL; + } +} + +/* + * get next header offset. m will be retained. + */ +int +ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) +{ + struct ip6_hdr ip6; + struct ip6_ext ip6e; + struct ip6_frag fh; + + /* just in case */ + if (m == NULL) + panic("ip6_nexthdr: m == NULL"); + if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) + return -1; + + switch (proto) { + case IPPROTO_IPV6: + /* do not chase beyond intermediate IPv6 headers */ + if (off != 0) + return -1; + if (m->m_pkthdr.len < off + sizeof(ip6)) + return -1; + m_copydata(m, off, sizeof(ip6), (void *)&ip6); + if (nxtp) + *nxtp = ip6.ip6_nxt; + off += sizeof(ip6); + return off; + + case IPPROTO_FRAGMENT: + /* + * terminate parsing if it is not the first fragment, + * it does not make sense to parse through it. + */ + if (m->m_pkthdr.len < off + sizeof(fh)) + return -1; + m_copydata(m, off, sizeof(fh), (void *)&fh); + if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0) + return -1; + if (nxtp) + *nxtp = fh.ip6f_nxt; + off += sizeof(struct ip6_frag); + return off; + + case IPPROTO_AH: + if (m->m_pkthdr.len < off + sizeof(ip6e)) + return -1; + m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); + if (nxtp) + *nxtp = ip6e.ip6e_nxt; + off += (ip6e.ip6e_len + 2) << 2; + if (m->m_pkthdr.len < off) + return -1; + return off; + + case IPPROTO_HOPOPTS: + case IPPROTO_ROUTING: + case IPPROTO_DSTOPTS: + if (m->m_pkthdr.len < off + sizeof(ip6e)) + return -1; + m_copydata(m, off, sizeof(ip6e), (void *)&ip6e); + if (nxtp) + *nxtp = ip6e.ip6e_nxt; + off += (ip6e.ip6e_len + 1) << 3; + if (m->m_pkthdr.len < off) + return -1; + return off; + + case IPPROTO_NONE: + case IPPROTO_ESP: + case IPPROTO_IPCOMP: + /* give up */ + return -1; + + default: + return -1; + } +} + +/* + * get offset for the last header in the chain. m will be kept untainted. + */ +int +ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) +{ + int newoff; + int nxt; + + if (!nxtp) { + nxt = -1; + nxtp = &nxt; + } + for (;;) { + newoff = ip6_nexthdr(m, off, proto, nxtp); + if (newoff < 0) + return off; + else if (newoff < off) + return -1; /* invalid */ + else if (newoff == off) + return newoff; + + off = newoff; + proto = *nxtp; + } +} + +struct m_tag * +ip6_addaux(struct mbuf *m) +{ + struct m_tag *mtag; + + mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); + if (!mtag) { + mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), + M_NOWAIT); + if (mtag) { + m_tag_prepend(m, mtag); + bzero(mtag + 1, sizeof(struct ip6aux)); + } + } + return mtag; +} + +struct m_tag * +ip6_findaux(struct mbuf *m) +{ + struct m_tag *mtag; + + mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); + return mtag; +} + +void +ip6_delaux(struct mbuf *m) +{ + struct m_tag *mtag; + + mtag = m_tag_find(m, PACKET_TAG_INET6, NULL); + if (mtag) + m_tag_delete(m, mtag); +} + +#ifdef GATEWAY +/* + * sysctl helper routine for net.inet.ip6.maxflows. Since + * we could reduce this value, call ip6flow_reap(); + */ +static int +sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS) +{ + int s; + + s = sysctl_lookup(SYSCTLFN_CALL(rnode)); + if (s || newp == NULL) + return (s); + + s = splsoftnet(); + ip6flow_reap(0); + splx(s); + + return (0); +} + +static int +sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS) +{ + int error, tmp; + struct sysctlnode node; + + node = *rnode; + tmp = ip6_hashsize; + node.sysctl_data = &tmp; + error = sysctl_lookup(SYSCTLFN_CALL(&node)); + if (error || newp == NULL) + return (error); + + if ((tmp & (tmp - 1)) == 0 && tmp != 0) { + /* + * Can only fail due to malloc() + */ + if (ip6flow_invalidate_all(tmp)) + return ENOMEM; + } else { + /* + * EINVAL if not a power of 2 + */ + return EINVAL; + } + + return (0); +} +#endif /* GATEWAY */ + +/* + * System control for IP6 + */ + +u_char inet6ctlerrmap[PRC_NCMDS] = { + 0, 0, 0, 0, + 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, + EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, + EMSGSIZE, EHOSTUNREACH, 0, 0, + 0, 0, 0, 0, + ENOPROTOOPT +}; + +SYSCTL_SETUP(sysctl_net_inet6_ip6_setup, "sysctl net.inet6.ip6 subtree setup") +{ +#ifdef RFC2292 +#define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y)) +#else +#define IS2292(x, y) (y) +#endif + + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_NODE, "net", NULL, + NULL, 0, NULL, 0, + CTL_NET, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_NODE, "inet6", + SYSCTL_DESCR("PF_INET6 related settings"), + NULL, 0, NULL, 0, + CTL_NET, PF_INET6, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_NODE, "ip6", + SYSCTL_DESCR("IPv6 related settings"), + NULL, 0, NULL, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL); + + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "forwarding", + SYSCTL_DESCR("Enable forwarding of INET6 datagrams"), + NULL, 0, &ip6_forwarding, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_FORWARDING, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "redirect", + SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"), + NULL, 0, &ip6_sendredirects, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_SENDREDIRECTS, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "hlim", + SYSCTL_DESCR("Hop limit for an INET6 datagram"), + NULL, 0, &ip6_defhlim, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_DEFHLIM, CTL_EOL); +#ifdef notyet + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "mtu", NULL, + NULL, 0, &, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_DEFMTU, CTL_EOL); +#endif +#ifdef __no_idea__ + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "forwsrcrt", NULL, + NULL, 0, &?, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_FORWSRCRT, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_STRUCT, "mrtstats", NULL, + NULL, 0, &?, sizeof(?), + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_MRTSTATS, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_?, "mrtproto", NULL, + NULL, 0, &?, sizeof(?), + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_MRTPROTO, CTL_EOL); +#endif + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "maxfragpackets", + SYSCTL_DESCR("Maximum number of fragments to buffer " + "for reassembly"), + NULL, 0, &ip6_maxfragpackets, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_MAXFRAGPACKETS, CTL_EOL); +#ifdef __no_idea__ + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "sourcecheck", NULL, + NULL, 0, &?, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_SOURCECHECK, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "sourcecheck_logint", NULL, + NULL, 0, &?, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL); +#endif + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "accept_rtadv", + SYSCTL_DESCR("Accept router advertisements"), + NULL, 0, &ip6_accept_rtadv, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_ACCEPT_RTADV, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "keepfaith", + SYSCTL_DESCR("Activate faith interface"), + NULL, 0, &ip6_keepfaith, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_KEEPFAITH, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "log_interval", + SYSCTL_DESCR("Minumum interval between logging " + "unroutable packets"), + NULL, 0, &ip6_log_interval, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_LOG_INTERVAL, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "hdrnestlimit", + SYSCTL_DESCR("Maximum number of nested IPv6 headers"), + NULL, 0, &ip6_hdrnestlimit, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_HDRNESTLIMIT, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "dad_count", + SYSCTL_DESCR("Number of Duplicate Address Detection " + "probes to send"), + NULL, 0, &ip6_dad_count, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_DAD_COUNT, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "auto_flowlabel", + SYSCTL_DESCR("Assign random IPv6 flow labels"), + NULL, 0, &ip6_auto_flowlabel, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_AUTO_FLOWLABEL, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "defmcasthlim", + SYSCTL_DESCR("Default multicast hop limit"), + NULL, 0, &ip6_defmcasthlim, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_DEFMCASTHLIM, CTL_EOL); +#if NGIF > 0 + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "gifhlim", + SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"), + NULL, 0, &ip6_gif_hlim, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_GIF_HLIM, CTL_EOL); +#endif /* NGIF */ + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_STRING, "kame_version", + SYSCTL_DESCR("KAME Version"), + NULL, 0, __UNCONST(__KAME_VERSION), 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_KAME_VERSION, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "use_deprecated", + SYSCTL_DESCR("Allow use of deprecated addresses as " + "source addresses"), + NULL, 0, &ip6_use_deprecated, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_USE_DEPRECATED, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "rr_prune", NULL, + NULL, 0, &ip6_rr_prune, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_RR_PRUNE, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT +#ifndef INET6_BINDV6ONLY + |CTLFLAG_READWRITE, +#endif + CTLTYPE_INT, "v6only", + SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting " + "to PF_INET sockets"), + NULL, 0, &ip6_v6only, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_V6ONLY, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "anonportmin", + SYSCTL_DESCR("Lowest ephemeral port number to assign"), + sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_ANONPORTMIN, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "anonportmax", + SYSCTL_DESCR("Highest ephemeral port number to assign"), + sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_ANONPORTMAX, CTL_EOL); +#ifndef IPNOPRIVPORTS + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "lowportmin", + SYSCTL_DESCR("Lowest privileged ephemeral port number " + "to assign"), + sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_LOWPORTMIN, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "lowportmax", + SYSCTL_DESCR("Highest privileged ephemeral port number " + "to assign"), + sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_LOWPORTMAX, CTL_EOL); +#endif /* IPNOPRIVPORTS */ + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "use_tempaddr", + SYSCTL_DESCR("Use temporary address"), + NULL, 0, &ip6_use_tempaddr, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + CTL_CREATE, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "temppltime", + SYSCTL_DESCR("preferred lifetime of a temporary address"), + NULL, 0, &ip6_temp_preferred_lifetime, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + CTL_CREATE, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "tempvltime", + SYSCTL_DESCR("valid lifetime of a temporary address"), + NULL, 0, &ip6_temp_valid_lifetime, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + CTL_CREATE, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "maxfrags", + SYSCTL_DESCR("Maximum fragments in reassembly queue"), + NULL, 0, &ip6_maxfrags, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_MAXFRAGS, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_STRUCT, "stats", + SYSCTL_DESCR("IPv6 statistics"), + NULL, 0, &ip6stat, sizeof(ip6stat), + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_STATS, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "use_defaultzone", + SYSCTL_DESCR("Whether to use the default scope zones"), + NULL, 0, &ip6_use_defzone, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + IPV6CTL_USE_DEFAULTZONE, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "mcast_pmtu", + SYSCTL_DESCR("Enable pMTU discovery for multicast packet"), + NULL, 0, &ip6_mcast_pmtu, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + CTL_CREATE, CTL_EOL); +#ifdef GATEWAY + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "maxflows", + SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"), + sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + CTL_CREATE, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "hashsize", + SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"), + sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0, + CTL_NET, PF_INET6, IPPROTO_IPV6, + CTL_CREATE, CTL_EOL); +#endif +}