/* $NetBSD: ip6_input.c,v 1.227 2022/10/28 05:18:39 ozaki-r 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 1.227 2022/10/28 05:18:39 ozaki-r Exp $"); #ifdef _KERNEL_OPT #include "opt_gateway.h" #include "opt_inet.h" #include "opt_inet6.h" #include "opt_ipsec.h" #include "opt_net_mpsafe.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #endif /* INET */ #include #include #include #include #include #include #include #include #include #include #ifdef IPSEC #include #include #include #endif /* IPSEC */ #include #include "faith.h" extern struct domain inet6domain; u_char ip6_protox[IPPROTO_MAX]; pktqueue_t *ip6_pktq __read_mostly; pfil_head_t *inet6_pfil_hook; percpu_t *ip6stat_percpu; percpu_t *ip6_forward_rt_percpu __cacheline_aligned; static void ip6intr(void *); static void ip6_input(struct mbuf *, struct ifnet *); static bool ip6_badaddr(struct ip6_hdr *); static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *); static struct m_tag *ip6_addaux(struct mbuf *); static struct m_tag *ip6_findaux(struct mbuf *); static void ip6_delaux(struct mbuf *); static int ip6_process_hopopts(struct mbuf *, u_int8_t *, int, u_int32_t *, u_int32_t *); static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); static void sysctl_net_inet6_ip6_setup(struct sysctllog **); #ifdef NET_MPSAFE #define SOFTNET_LOCK() mutex_enter(softnet_lock) #define SOFTNET_UNLOCK() mutex_exit(softnet_lock) #else #define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock)) #define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock)) #endif /* Ensure that non packed structures are the desired size. */ __CTASSERT(sizeof(struct ip6_hdr) == 40); __CTASSERT(sizeof(struct ip6_ext) == 2); __CTASSERT(sizeof(struct ip6_hbh) == 2); __CTASSERT(sizeof(struct ip6_dest) == 2); __CTASSERT(sizeof(struct ip6_opt) == 2); __CTASSERT(sizeof(struct ip6_opt_jumbo) == 6); __CTASSERT(sizeof(struct ip6_opt_nsap) == 4); __CTASSERT(sizeof(struct ip6_opt_tunnel) == 3); __CTASSERT(sizeof(struct ip6_opt_router) == 4); __CTASSERT(sizeof(struct ip6_rthdr) == 4); __CTASSERT(sizeof(struct ip6_rthdr0) == 8); __CTASSERT(sizeof(struct ip6_frag) == 8); /* * IP6 initialization: fill in IP6 protocol switch table. * All protocols not implemented in kernel go to raw IP6 protocol handler. */ void ip6_init(void) { const struct ip6protosw *pr; int i; in6_init(); ip6_pktq = pktq_create(IFQ_MAXLEN, ip6intr, NULL); KASSERT(ip6_pktq != NULL); sysctl_net_inet6_ip6_setup(NULL); 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; scope6_init(); addrsel_policy_init(); nd6_init(); frag6_init(); #ifdef GATEWAY ip6flow_init(ip6_hashsize); #endif /* Register our Packet Filter hook. */ inet6_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET6); KASSERT(inet6_pfil_hook != NULL); ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS); ip6_forward_rt_percpu = rtcache_percpu_alloc(); } /* * IP6 input interrupt handling. Just pass the packet to ip6_input. */ static void ip6intr(void *arg __unused) { struct mbuf *m; SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); while ((m = pktq_dequeue(ip6_pktq)) != NULL) { struct psref psref; struct ifnet *rcvif = m_get_rcvif_psref(m, &psref); if (rcvif == NULL) { IP6_STATINC(IP6_STAT_IFDROP); m_freem(m); continue; } /* * Drop the packet if IPv6 is disabled on the interface. */ if ((ND_IFINFO(rcvif)->flags & ND6_IFF_IFDISABLED)) { m_put_rcvif_psref(rcvif, &psref); IP6_STATINC(IP6_STAT_IFDROP); m_freem(m); continue; } ip6_input(m, rcvif); m_put_rcvif_psref(rcvif, &psref); } SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); } static void ip6_input(struct mbuf *m, struct ifnet *rcvif) { 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, frg_present; struct ifnet *deliverifp = NULL; int srcrt = 0; struct rtentry *rt = NULL; union { struct sockaddr dst; struct sockaddr_in6 dst6; } u; struct route *ro; KASSERT(rcvif != NULL); /* * 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) IP6_STATINC(IP6_STAT_MEXT2M); else IP6_STATINC(IP6_STAT_MEXT1); } else { #define M2MMAX 32 if (m->m_next) { if (m->m_flags & M_LOOP) /*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index); else if (rcvif->if_index < M2MMAX) IP6_STATINC(IP6_STAT_M2M + rcvif->if_index); else IP6_STATINC(IP6_STAT_M2M); } else IP6_STATINC(IP6_STAT_M1); #undef M2MMAX } in6_ifstat_inc(rcvif, ifs6_in_receive); IP6_STATINC(IP6_STAT_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 (M_GET_ALIGNED_HDR(&m, struct ip6_hdr, true) != 0) { /* XXXJRT new stat, please */ IP6_STATINC(IP6_STAT_TOOSMALL); in6_ifstat_inc(rcvif, ifs6_in_hdrerr); return; } ip6 = mtod(m, struct ip6_hdr *); if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { IP6_STATINC(IP6_STAT_BADVERS); in6_ifstat_inc(rcvif, ifs6_in_hdrerr); goto bad; } if (ip6_badaddr(ip6)) { IP6_STATINC(IP6_STAT_BADSCOPE); in6_ifstat_inc(rcvif, ifs6_in_addrerr); goto bad; } /* * Assume that we can create a fast-forward IP flow entry * based on this packet. */ m->m_flags |= M_CANFASTFWD; /* * 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. * * Don't call hooks if the packet has already been processed by * IPsec (encapsulated, tunnel mode). */ #if defined(IPSEC) if (!ipsec_used || !ipsec_skip_pfil(m)) #else if (1) #endif { struct in6_addr odst; int error; odst = ip6->ip6_dst; error = pfil_run_hooks(inet6_pfil_hook, &m, rcvif, PFIL_IN); if (error != 0 || m == NULL) { IP6_STATINC(IP6_STAT_PFILDROP_IN); return; } if (m->m_len < sizeof(struct ip6_hdr)) { if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { IP6_STATINC(IP6_STAT_TOOSMALL); in6_ifstat_inc(rcvif, ifs6_in_hdrerr); return; } } ip6 = mtod(m, struct ip6_hdr *); srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); } IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt); #ifdef ALTQ if (altq_input != NULL) { SOFTNET_LOCK(); if ((*altq_input)(m, AF_INET6) == 0) { SOFTNET_UNLOCK(); /* packet is dropped by traffic conditioner */ return; } SOFTNET_UNLOCK(); } #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))) { IP6_STATINC(IP6_STAT_IDROPPED); goto bad; } ip6 = mtod(m, struct ip6_hdr *); if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */ goto bad; } if (in6_setscope(&ip6->ip6_src, rcvif, NULL) || in6_setscope(&ip6->ip6_dst, rcvif, NULL)) { IP6_STATINC(IP6_STAT_BADSCOPE); goto bad; } ro = rtcache_percpu_getref(ip6_forward_rt_percpu); /* * Multicast check */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { bool ingroup; in6_ifstat_inc(rcvif, ifs6_in_mcast); /* * See if we belong to the destination multicast group on the * arrival interface. */ ingroup = in6_multi_group(&ip6->ip6_dst, rcvif); if (ingroup) { ours = 1; } else if (!ip6_mrouter) { uint64_t *ip6s = IP6_STAT_GETREF(); ip6s[IP6_STAT_NOTMEMBER]++; ip6s[IP6_STAT_CANTFORWARD]++; IP6_STAT_PUTREF(); in6_ifstat_inc(rcvif, ifs6_in_discard); goto bad_unref; } deliverifp = rcvif; goto hbhcheck; } sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0); /* * Unicast check */ rt = rtcache_lookup2(ro, &u.dst, 1, &hit); if (hit) IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT); else IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS); /* * 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. * * We don't explicitly match ip6_dst against an interface here. It * is already done in rtcache_lookup2: rt->rt_ifp->if_type will be * IFT_LOOP if the packet is for us. * * 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_ifp->if_type == IFT_LOOP) { struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa; int addrok; 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) addrok = 0; else if (ia6->ia6_flags & IN6_IFF_DETACHED && !IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { /* Allow internal traffic to DETACHED addresses */ struct sockaddr_in6 sin6; int s; memset(&sin6, 0, sizeof(sin6)); sin6.sin6_family = AF_INET6; sin6.sin6_len = sizeof(sin6); sin6.sin6_addr = ip6->ip6_src; s = pserialize_read_enter(); addrok = (ifa_ifwithaddr(sin6tosa(&sin6)) != NULL); pserialize_read_exit(s); } else addrok = 1; if (addrok) { /* this address is ready */ ours = 1; deliverifp = ia6->ia_ifp; /* correct? */ goto hbhcheck; } else { /* address is not ready, so discard the packet. */ char ip6bufs[INET6_ADDRSTRLEN]; char ip6bufd[INET6_ADDRSTRLEN]; nd6log(LOG_INFO, "packet to an unready address %s->%s\n", IN6_PRINT(ip6bufs, &ip6->ip6_src), IN6_PRINT(ip6bufd, &ip6->ip6_dst)); IP6_STATINC(IP6_STAT_IDROPPED); goto bad_unref; } } /* * 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 /* * Now there is no reason to process the packet if it's not our own * and we're not a router. */ if (!ip6_forwarding) { IP6_STATINC(IP6_STAT_CANTFORWARD); in6_ifstat_inc(rcvif, ifs6_in_discard); goto bad_unref; } 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) == NULL) { struct in6_ifaddr *ia6; int s = pserialize_read_enter(); ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); /* Depends on ip6_setdstifaddr never sleep */ if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) { /* * XXX maybe we should drop the packet here, * as we could not provide enough information * to the upper layers. */ } pserialize_read_exit(s); } /* * 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)) { /* m already freed */ in6_ifstat_inc(rcvif, ifs6_in_discard); rtcache_unref(rt, ro); rtcache_percpu_putref(ip6_forward_rt_percpu); return; } /* 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. */ IP6_STATINC(IP6_STAT_BADOPTIONS); in6_ifstat_inc(rcvif, ifs6_in_discard); in6_ifstat_inc(rcvif, ifs6_in_hdrerr); icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, (char *)&ip6->ip6_plen - (char *)ip6); rtcache_unref(rt, ro); rtcache_percpu_putref(ip6_forward_rt_percpu); return; } IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); if (hbh == NULL) { IP6_STATINC(IP6_STAT_TOOSHORT); rtcache_unref(rt, ro); rtcache_percpu_putref(ip6_forward_rt_percpu); return; } KASSERT(ACCESSIBLE_POINTER(hbh, struct ip6_hdr)); 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 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) { IP6_STATINC(IP6_STAT_TOOSHORT); in6_ifstat_inc(rcvif, ifs6_in_truncated); goto bad_unref; } 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 != NULL) { int error; SOFTNET_LOCK(); error = ip6_mforward(ip6, rcvif, m); SOFTNET_UNLOCK(); if (error != 0) { rtcache_unref(rt, ro); rtcache_percpu_putref(ip6_forward_rt_percpu); IP6_STATINC(IP6_STAT_CANTFORWARD); goto bad; } } if (!ours) { IP6_STATINC(IP6_STAT_CANTFORWARD); goto bad_unref; } } else if (!ours) { rtcache_unref(rt, ro); rtcache_percpu_putref(ip6_forward_rt_percpu); ip6_forward(m, srcrt, rcvif); 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)) { IP6_STATINC(IP6_STAT_BADSCOPE); in6_ifstat_inc(rcvif, ifs6_in_addrerr); goto bad_unref; } #ifdef IFA_STATS if (deliverifp != NULL) { struct in6_ifaddr *ia6; int s = pserialize_read_enter(); ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); if (ia6) ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len; pserialize_read_exit(s); } #endif IP6_STATINC(IP6_STAT_DELIVERED); in6_ifstat_inc(deliverifp, ifs6_in_deliver); nest = 0; if (rt != NULL) { rtcache_unref(rt, ro); rt = NULL; } rtcache_percpu_putref(ip6_forward_rt_percpu); rh_present = 0; frg_present = 0; while (nxt != IPPROTO_DONE) { if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { IP6_STATINC(IP6_STAT_TOOMANYHDR); in6_ifstat_inc(rcvif, ifs6_in_hdrerr); goto bad; } M_VERIFY_PACKET(m); /* * protection against faulty packet - there should be * more sanity checks in header chain processing. */ if (m->m_pkthdr.len < off) { IP6_STATINC(IP6_STAT_TOOSHORT); in6_ifstat_inc(rcvif, ifs6_in_truncated); goto bad; } if (nxt == IPPROTO_ROUTING) { if (rh_present++) { in6_ifstat_inc(rcvif, ifs6_in_hdrerr); IP6_STATINC(IP6_STAT_BADOPTIONS); goto bad; } } else if (nxt == IPPROTO_FRAGMENT) { if (frg_present++) { in6_ifstat_inc(rcvif, ifs6_in_hdrerr); IP6_STATINC(IP6_STAT_BADOPTIONS); goto bad; } } #ifdef IPSEC if (ipsec_used) { /* * 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) { int error; error = ipsec_ip_input_checkpolicy(m, false); if (error) { IP6_STATINC(IP6_STAT_IPSECDROP_IN); goto bad; } } } #endif nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); } return; bad_unref: rtcache_unref(rt, ro); rtcache_percpu_putref(ip6_forward_rt_percpu); bad: m_freem(m); return; } static bool ip6_badaddr(struct ip6_hdr *ip6) { /* Check against address spoofing/corruption. */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { return true; } /* * 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)) { return true; } /* * Reject packets with IPv4-compatible IPv6 addresses (RFC4291). */ if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { return true; } return false; } /* * set/grab in6_ifaddr correspond to IPv6 destination address. */ static struct m_tag * ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia) { struct m_tag *mtag; struct ip6aux *ip6a; mtag = ip6_addaux(m); if (mtag == NULL) return NULL; ip6a = (struct ip6aux *)(mtag + 1); if (in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id)) { IP6_STATINC(IP6_STAT_BADSCOPE); return NULL; } ip6a->ip6a_src = ia->ia_addr.sin6_addr; ip6a->ip6a_flags = ia->ia6_flags; return mtag; } const struct ip6aux * ip6_getdstifaddr(struct mbuf *m) { struct m_tag *mtag; mtag = ip6_findaux(m); if (mtag != NULL) return (struct ip6aux *)(mtag + 1); 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 */ 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) { IP6_STATINC(IP6_STAT_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) { IP6_STATINC(IP6_STAT_TOOSHORT); return -1; } KASSERT(ACCESSIBLE_POINTER(hbh, struct ip6_hdr)); 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. */ static 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) { IP6_STATINC(IP6_STAT_TOOSMALL); goto bad; } optlen = *(opt + 1) + 2; break; case IP6OPT_RTALERT: /* XXX may need check for alignment */ if (hbhlen < IP6OPT_RTALERT_LEN) { IP6_STATINC(IP6_STAT_TOOSMALL); goto bad; } if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { IP6_STATINC(IP6_STAT_BADOPTIONS); icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, erroff + opt + 1 - opthead); return (-1); } optlen = IP6OPT_RTALERT_LEN; memcpy((void *)&rtalert_val, (void *)(opt + 2), 2); *rtalertp = ntohs(rtalert_val); break; case IP6OPT_JUMBO: /* XXX may need check for alignment */ if (hbhlen < IP6OPT_JUMBO_LEN) { IP6_STATINC(IP6_STAT_TOOSMALL); goto bad; } if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { IP6_STATINC(IP6_STAT_BADOPTIONS); 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) { IP6_STATINC(IP6_STAT_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 memcpy(). */ memcpy(&jumboplen, opt + 2, 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) { IP6_STATINC(IP6_STAT_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) { IP6_STATINC(IP6_STAT_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) { IP6_STATINC(IP6_STAT_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 */ IP6_STATINC(IP6_STAT_BADOPTIONS); icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); return (-1); case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ IP6_STATINC(IP6_STAT_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); } void ip6_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip6_hdr *ip6, struct mbuf *m) { struct socket *so = inp->inp_socket; #ifdef RFC2292 #define IS2292(x, y) ((inp->inp_flags & IN6P_RFC2292) ? (x) : (y)) #else #define IS2292(x, y) (y) #endif KASSERT(m->m_flags & M_PKTHDR); if (SOOPT_TIMESTAMP(so->so_options)) mp = sbsavetimestamp(so->so_options, mp); /* 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 ((inp->inp_flags & IN6P_PKTINFO) != 0) { struct in6_pktinfo pi6; memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr)); in6_clearscope(&pi6.ipi6_addr); /* XXX */ pi6.ipi6_ifindex = m->m_pkthdr.rcvif_index; *mp = sbcreatecontrol(&pi6, sizeof(pi6), IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); if (*mp) mp = &(*mp)->m_next; } if (inp->inp_flags & IN6P_HOPLIMIT) { int hlim = ip6->ip6_hlim & 0xff; *mp = sbcreatecontrol(&hlim, sizeof(hlim), IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6); if (*mp) mp = &(*mp)->m_next; } if ((inp->inp_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(&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 ((inp->inp_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) { IP6_STATINC(IP6_STAT_TOOSHORT); return; } hbh = mtod(ext, struct ip6_hbh *); hbhlen = (hbh->ip6h_len + 1) << 3; if (hbhlen != ext->m_len) { m_freem(ext); IP6_STATINC(IP6_STAT_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(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 (inp->inp_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) { IP6_STATINC(IP6_STAT_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); IP6_STATINC(IP6_STAT_TOOSHORT); return; } KASSERT(ACCESSIBLE_POINTER(ip6e, struct ip6_hdr)); switch (nxt) { case IPPROTO_DSTOPTS: if (!(inp->inp_flags & IN6P_DSTOPTS)) break; *mp = sbcreatecontrol(ip6e, elen, IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS), IPPROTO_IPV6); if (*mp) mp = &(*mp)->m_next; break; case IPPROTO_ROUTING: if (!(inp->inp_flags & IN6P_RTHDR)) break; *mp = sbcreatecontrol(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 inpcb *inp, const struct sockaddr_in6 *dst, uint32_t *mtu) { struct socket *so; struct mbuf *m_mtu; struct ip6_mtuinfo mtuctl; so = inp->inp_socket; if (mtu == NULL) return; KASSERT(so != NULL); 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(&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) return; if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu) == 0) { soroverflow(so); m_freem(m_mtu); } 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; if (off + sizeof(ip6e) > m->m_pkthdr.len) return NULL; 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; if (off + elen > m->m_pkthdr.len) return NULL; 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 offset to the previous header followed by the header * currently processed. */ int ip6_get_prevhdr(struct mbuf *m, int off) { struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); if (off == sizeof(struct ip6_hdr)) { return offsetof(struct ip6_hdr, ip6_nxt); } else if (off < sizeof(struct ip6_hdr)) { panic("%s: off < sizeof(struct ip6_hdr)", __func__); } else { int len, nlen, nxt; struct ip6_ext ip6e; nxt = ip6->ip6_nxt; len = sizeof(struct ip6_hdr); nlen = 0; while (len < off) { m_copydata(m, len, sizeof(ip6e), &ip6e); switch (nxt) { case IPPROTO_FRAGMENT: nlen = sizeof(struct ip6_frag); break; case IPPROTO_AH: nlen = (ip6e.ip6e_len + 2) << 2; break; default: nlen = (ip6e.ip6e_len + 1) << 3; break; } len += nlen; nxt = ip6e.ip6e_nxt; } return (len - nlen); } } /* * 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("%s: m == NULL", __func__); 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; } } static struct m_tag * ip6_addaux(struct mbuf *m) { struct m_tag *mtag; mtag = m_tag_find(m, PACKET_TAG_INET6); if (!mtag) { mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux), M_NOWAIT); if (mtag) { m_tag_prepend(m, mtag); memset(mtag + 1, 0, sizeof(struct ip6aux)); } } return mtag; } static struct m_tag * ip6_findaux(struct mbuf *m) { struct m_tag *mtag; mtag = m_tag_find(m, PACKET_TAG_INET6); return mtag; } static void ip6_delaux(struct mbuf *m) { struct m_tag *mtag; mtag = m_tag_find(m, PACKET_TAG_INET6); if (mtag) m_tag_delete(m, mtag); } /* * System control for IP6 */ const 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 }; extern int sysctl_net_inet6_addrctlpolicy(SYSCTLFN_ARGS); static int sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS) { return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS)); } static void sysctl_net_inet6_ip6_setup(struct sysctllog **clog) { const struct sysctlnode *ip6_node; 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, &ip6_node, 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); 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); pktq_sysctl_setup(ip6_pktq, clog, ip6_node, IPV6CTL_IFQ); 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("Minimum 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); 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 #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, "auto_linklocal", SYSCTL_DESCR("Default value of per-interface flag for " "adding an IPv6 link-local address to " "interfaces when attached"), NULL, 0, &ip6_auto_linklocal, 0, CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_AUTO_LINKLOCAL, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READONLY, CTLTYPE_STRUCT, "addctlpolicy", SYSCTL_DESCR("Return the current address control" " policy"), sysctl_net_inet6_addrctlpolicy, 0, NULL, 0, CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_ADDRCTLPOLICY, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "prefer_tempaddr", SYSCTL_DESCR("Prefer temporary address as source " "address"), NULL, 0, &ip6_prefer_tempaddr, 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"), sysctl_net_inet6_ip6_stats, 0, NULL, 0, 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); /* anonportalgo RFC6056 subtree */ const struct sysctlnode *portalgo_node; sysctl_createv(clog, 0, NULL, &portalgo_node, CTLFLAG_PERMANENT, CTLTYPE_NODE, "anonportalgo", SYSCTL_DESCR("Anonymous port algorithm selection (RFC 6056)"), NULL, 0, NULL, 0, CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, &portalgo_node, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRING, "available", SYSCTL_DESCR("available algorithms"), sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, &portalgo_node, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRING, "selected", SYSCTL_DESCR("selected algorithm"), sysctl_portalgo_selected6, 0, NULL, PORTALGO_MAXLEN, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, &portalgo_node, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_STRUCT, "reserve", SYSCTL_DESCR("bitmap of reserved ports"), sysctl_portalgo_reserve6, 0, NULL, 0, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "neighborgcthresh", SYSCTL_DESCR("Maximum number of entries in neighbor" " cache"), NULL, 1, &ip6_neighborgcthresh, 0, CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "maxdynroutes", SYSCTL_DESCR("Maximum number of routes created via" " redirect"), NULL, 1, &ip6_maxdynroutes, 0, CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "param_rt_msg", SYSCTL_DESCR("How to send parameter changing" " routing message"), NULL, 0, &ip6_param_rt_msg, 0, CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_CREATE, CTL_EOL); } void ip6_statinc(u_int stat) { KASSERT(stat < IP6_NSTATS); IP6_STATINC(stat); }