/* $NetBSD: ip_input.c,v 1.389.2.3 2021/03/07 19:04:31 martin 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) 1998 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Public Access Networks Corporation ("Panix"). It was developed under * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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: ip_input.c,v 1.389.2.3 2021/03/07 19:04:31 martin Exp $"); #ifdef _KERNEL_OPT #include "opt_inet.h" #include "opt_gateway.h" #include "opt_ipsec.h" #include "opt_mrouting.h" #include "opt_mbuftrace.h" #include "opt_inet_csum.h" #include "opt_net_mpsafe.h" #endif #include "arp.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* just for gif_ttl */ #include #include "gif.h" #include #include "gre.h" #ifdef MROUTING #include #endif #include #ifdef IPSEC #include #endif #ifndef IPFORWARDING #ifdef GATEWAY #define IPFORWARDING 1 /* forward IP packets not for us */ #else #define IPFORWARDING 0 /* don't forward IP packets not for us */ #endif #endif #define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */ int ipforwarding = IPFORWARDING; int ipsendredirects = 1; int ip_defttl = IPDEFTTL; int ip_forwsrcrt = 0; int ip_directedbcast = 0; int ip_allowsrcrt = 0; int ip_mtudisc = 1; int ip_mtudisc_timeout = IPMTUDISCTIMEOUT; int ip_do_randomid = 1; /* * XXX - Setting ip_checkinterface mostly implements the receive side of * the Strong ES model described in RFC 1122, but since the routing table * and transmit implementation do not implement the Strong ES model, * setting this to 1 results in an odd hybrid. * * XXX - ip_checkinterface currently must be disabled if you use NAT * to translate the destination address to another local interface. * * XXX - ip_checkinterface must be disabled if you add IP aliases * to the loopback interface instead of the interface where the * packets for those addresses are received. */ static int ip_checkinterface __read_mostly = 0; struct rttimer_queue *ip_mtudisc_timeout_q = NULL; pktqueue_t * ip_pktq __read_mostly; pfil_head_t * inet_pfil_hook __read_mostly; ipid_state_t * ip_ids __read_mostly; percpu_t * ipstat_percpu __read_mostly; static percpu_t *ipforward_rt_percpu __cacheline_aligned; uint16_t ip_id; #ifdef INET_CSUM_COUNTERS #include struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "inet", "hwcsum bad"); struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "inet", "hwcsum ok"); struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, NULL, "inet", "swcsum"); #define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ EVCNT_ATTACH_STATIC(ip_hwcsum_bad); EVCNT_ATTACH_STATIC(ip_hwcsum_ok); EVCNT_ATTACH_STATIC(ip_swcsum); #else #define INET_CSUM_COUNTER_INCR(ev) /* nothing */ #endif /* INET_CSUM_COUNTERS */ /* * Used to save the IP options in case a protocol wants to respond * to an incoming packet over the same route if the packet got here * using IP source routing. This allows connection establishment and * maintenance when the remote end is on a network that is not known * to us. */ struct ip_srcrt { int isr_nhops; /* number of hops */ struct in_addr isr_dst; /* final destination */ char isr_nop; /* one NOP to align */ char isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */ struct in_addr isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)]; }; static int ip_drainwanted; static void save_rte(struct mbuf *, u_char *, struct in_addr); #ifdef MBUFTRACE struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx"); struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx"); #endif static void ipintr(void *); static void ip_input(struct mbuf *); static void ip_forward(struct mbuf *, int, struct ifnet *); static bool ip_dooptions(struct mbuf *); static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *); static void sysctl_net_inet_ip_setup(struct sysctllog **); static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *, int *); static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *, struct ip *); #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 /* * IP initialization: fill in IP protocol switch table. * All protocols not implemented in kernel go to raw IP protocol handler. */ void ip_init(void) { const struct protosw *pr; in_init(); sysctl_net_inet_ip_setup(NULL); pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); KASSERT(pr != NULL); ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL); KASSERT(ip_pktq != NULL); for (u_int i = 0; i < IPPROTO_MAX; i++) { ip_protox[i] = pr - inetsw; } for (pr = inetdomain.dom_protosw; pr < inetdomain.dom_protoswNPROTOSW; pr++) if (pr->pr_domain->dom_family == PF_INET && pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) ip_protox[pr->pr_protocol] = pr - inetsw; ip_reass_init(); ip_ids = ip_id_init(); ip_id = time_uptime & 0xfffff; #ifdef GATEWAY ipflow_init(); #endif /* Register our Packet Filter hook. */ inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET); KASSERT(inet_pfil_hook != NULL); #ifdef MBUFTRACE MOWNER_ATTACH(&ip_tx_mowner); MOWNER_ATTACH(&ip_rx_mowner); #endif ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS); ipforward_rt_percpu = rtcache_percpu_alloc(); ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout); } static struct in_ifaddr * ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch) { struct in_ifaddr *ia = NULL; int checkif; /* * Enable a consistency check between the destination address * and the arrival interface for a unicast packet (the RFC 1122 * strong ES model) if IP forwarding is disabled and the packet * is not locally generated. * * XXX - We need to add a per ifaddr flag for this so that * we get finer grain control. */ checkif = ip_checkinterface && (ipforwarding == 0) && (ifp->if_flags & IFF_LOOPBACK) == 0; IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) { if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) { if (ia->ia4_flags & IN_IFF_NOTREADY) continue; if (checkif && ia->ia_ifp != ifp) continue; if ((ia->ia_ifp->if_flags & IFF_UP) == 0) { (*downmatch)++; continue; } if (ia->ia4_flags & IN_IFF_DETACHED && (ifp->if_flags & IFF_LOOPBACK) == 0) continue; break; } } return ia; } static struct in_ifaddr * ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip) { struct in_ifaddr *ia = NULL; struct ifaddr *ifa; IFADDR_READER_FOREACH(ifa, ifp) { if (ifa->ifa_addr->sa_family != AF_INET) continue; ia = ifatoia(ifa); if (ia->ia4_flags & IN_IFF_NOTREADY) continue; if (ia->ia4_flags & IN_IFF_DETACHED && (ifp->if_flags & IFF_LOOPBACK) == 0) continue; if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) || in_hosteq(ip->ip_dst, ia->ia_netbroadcast) || /* * Look for all-0's host part (old broadcast addr), * either for subnet or net. */ ip->ip_dst.s_addr == ia->ia_subnet || ip->ip_dst.s_addr == ia->ia_net) goto matched; /* * An interface with IP address zero accepts * all packets that arrive on that interface. */ if (in_nullhost(ia->ia_addr.sin_addr)) goto matched; } ia = NULL; matched: return ia; } /* * IP software interrupt routine. */ static void ipintr(void *arg __unused) { struct mbuf *m; KASSERT(cpu_softintr_p()); SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); while ((m = pktq_dequeue(ip_pktq)) != NULL) { ip_input(m); } SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); } /* * IP input routine. Checksum and byte swap header. If fragmented * try to reassemble. Process options. Pass to next level. */ static void ip_input(struct mbuf *m) { struct ip *ip = NULL; struct in_ifaddr *ia = NULL; int hlen = 0, len; int downmatch; int srcrt = 0; ifnet_t *ifp; struct psref psref; int s; KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software " "interrupt handler; synchronization assumptions violated"); MCLAIM(m, &ip_rx_mowner); KASSERT((m->m_flags & M_PKTHDR) != 0); ifp = m_get_rcvif_psref(m, &psref); if (__predict_false(ifp == NULL)) goto out; /* * If no IP addresses have been set yet but the interfaces * are receiving, can't do anything with incoming packets yet. * Note: we pre-check without locks held. */ if (IN_ADDRLIST_READER_EMPTY()) goto out; IP_STATINC(IP_STAT_TOTAL); /* * If the IP 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 IP header is in the first mbuf of the chain. */ if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) { if ((m = m_copyup(m, sizeof(struct ip), (max_linkhdr + 3) & ~3)) == NULL) { /* XXXJRT new stat, please */ IP_STATINC(IP_STAT_TOOSMALL); goto out; } } else if (__predict_false(m->m_len < sizeof(struct ip))) { if ((m = m_pullup(m, sizeof(struct ip))) == NULL) { IP_STATINC(IP_STAT_TOOSMALL); goto out; } } ip = mtod(m, struct ip *); if (ip->ip_v != IPVERSION) { IP_STATINC(IP_STAT_BADVERS); goto out; } hlen = ip->ip_hl << 2; if (hlen < sizeof(struct ip)) { /* minimum header length */ IP_STATINC(IP_STAT_BADHLEN); goto out; } if (hlen > m->m_len) { if ((m = m_pullup(m, hlen)) == NULL) { IP_STATINC(IP_STAT_BADHLEN); goto out; } ip = mtod(m, struct ip *); } /* * RFC1122: packets with a multicast source address are * not allowed. */ if (IN_MULTICAST(ip->ip_src.s_addr)) { IP_STATINC(IP_STAT_BADADDR); goto out; } /* 127/8 must not appear on wire - RFC1122 */ if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) { if ((ifp->if_flags & IFF_LOOPBACK) == 0) { IP_STATINC(IP_STAT_BADADDR); goto out; } } switch (m->m_pkthdr.csum_flags & ((ifp->if_csum_flags_rx & M_CSUM_IPv4) | M_CSUM_IPv4_BAD)) { case M_CSUM_IPv4|M_CSUM_IPv4_BAD: INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad); IP_STATINC(IP_STAT_BADSUM); goto out; case M_CSUM_IPv4: /* Checksum was okay. */ INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok); break; default: /* * Must compute it ourselves. Maybe skip checksum on * loopback interfaces. */ if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) || ip_do_loopback_cksum)) { INET_CSUM_COUNTER_INCR(&ip_swcsum); if (in_cksum(m, hlen) != 0) { IP_STATINC(IP_STAT_BADSUM); goto out; } } break; } /* Retrieve the packet length. */ len = ntohs(ip->ip_len); /* * Check for additional length bogosity */ if (len < hlen) { IP_STATINC(IP_STAT_BADLEN); goto out; } /* * Check that the amount of data in the buffers is at least as much * as the IP header would have us expect. Trim mbufs if longer than * we expect. Drop packet if shorter than we expect. */ if (m->m_pkthdr.len < len) { IP_STATINC(IP_STAT_TOOSHORT); goto out; } if (m->m_pkthdr.len > len) { if (m->m_len == m->m_pkthdr.len) { m->m_len = len; m->m_pkthdr.len = len; } else m_adj(m, len - m->m_pkthdr.len); } /* * 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 in_addr odst = ip->ip_dst; bool freed; freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0; if (freed || m == NULL) { m = NULL; IP_STATINC(IP_STAT_PFILDROP_IN); goto out; } if (__predict_false(m->m_len < sizeof(struct ip))) { if ((m = m_pullup(m, sizeof(struct ip))) == NULL) { IP_STATINC(IP_STAT_TOOSMALL); goto out; } } ip = mtod(m, struct ip *); hlen = ip->ip_hl << 2; if (hlen < sizeof(struct ip)) { /* minimum header length */ IP_STATINC(IP_STAT_BADHLEN); goto out; } if (hlen > m->m_len) { if ((m = m_pullup(m, hlen)) == NULL) { IP_STATINC(IP_STAT_BADHLEN); goto out; } ip = mtod(m, struct ip *); } /* * XXX The setting of "srcrt" here is to prevent ip_forward() * from generating ICMP redirects for packets that have * been redirected by a hook back out on to the same LAN that * they came from and is not an indication that the packet * is being influenced by source routing options. This * allows things like * "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp" * where tlp0 is both on the 1.1.1.0/24 network and is the * default route for hosts on 1.1.1.0/24. Of course this * also requires a "map tlp0 ..." to complete the story. * One might argue whether or not this kind of network config. * should be supported in this manner... */ srcrt = (odst.s_addr != ip->ip_dst.s_addr); } #ifdef ALTQ /* XXX Temporary until ALTQ is changed to use a pfil hook */ if (altq_input) { SOFTNET_LOCK(); if ((*altq_input)(m, AF_INET) == 0) { /* Packet dropped by traffic conditioner. */ SOFTNET_UNLOCK(); m = NULL; goto out; } SOFTNET_UNLOCK(); } #endif /* * Process options and, if not destined for us, * ship it on. ip_dooptions returns 1 when an * error was detected (causing an icmp message * to be sent and the original packet to be freed). */ if (hlen > sizeof(struct ip) && ip_dooptions(m)) { m = NULL; goto out; } /* * Check our list of addresses, to see if the packet is for us. * * Traditional 4.4BSD did not consult IFF_UP at all. * The behavior here is to treat addresses on !IFF_UP interface * or IN_IFF_NOTREADY addresses as not mine. */ downmatch = 0; s = pserialize_read_enter(); ia = ip_match_our_address(ifp, ip, &downmatch); if (ia != NULL) { pserialize_read_exit(s); goto ours; } if (ifp->if_flags & IFF_BROADCAST) { ia = ip_match_our_address_broadcast(ifp, ip); if (ia != NULL) { pserialize_read_exit(s); goto ours; } } pserialize_read_exit(s); if (IN_MULTICAST(ip->ip_dst.s_addr)) { #ifdef MROUTING extern struct socket *ip_mrouter; if (ip_mrouter) { /* * 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 * ip_mforward() returns a non-zero value, the packet * must be discarded, else it may be accepted below. * * (The IP ident field is put in the same byte order * as expected when ip_mforward() is called from * ip_output().) */ SOFTNET_LOCK(); if (ip_mforward(m, ifp) != 0) { SOFTNET_UNLOCK(); IP_STATINC(IP_STAT_CANTFORWARD); goto out; } SOFTNET_UNLOCK(); /* * The process-level routing demon needs to receive * all multicast IGMP packets, whether or not this * host belongs to their destination groups. */ if (ip->ip_p == IPPROTO_IGMP) { goto ours; } IP_STATINC(IP_STAT_CANTFORWARD); } #endif /* * See if we belong to the destination multicast group on the * arrival interface. */ if (!in_multi_group(ip->ip_dst, ifp, 0)) { IP_STATINC(IP_STAT_CANTFORWARD); goto out; } goto ours; } if (ip->ip_dst.s_addr == INADDR_BROADCAST || in_nullhost(ip->ip_dst)) goto ours; /* * Not for us; forward if possible and desirable. */ if (ipforwarding == 0) { m_put_rcvif_psref(ifp, &psref); IP_STATINC(IP_STAT_CANTFORWARD); m_freem(m); } else { /* * If ip_dst matched any of my address on !IFF_UP interface, * and there's no IFF_UP interface that matches ip_dst, * send icmp unreach. Forwarding it will result in in-kernel * forwarding loop till TTL goes to 0. */ if (downmatch) { m_put_rcvif_psref(ifp, &psref); icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0); IP_STATINC(IP_STAT_CANTFORWARD); return; } #ifdef IPSEC /* Check the security policy (SP) for the packet */ if (ipsec_used) { if (ipsec_ip_input(m, true) != 0) { goto out; } } #endif ip_forward(m, srcrt, ifp); m_put_rcvif_psref(ifp, &psref); } return; ours: m_put_rcvif_psref(ifp, &psref); ifp = NULL; /* * If offset or IP_MF are set, must reassemble. */ if (ip->ip_off & ~htons(IP_DF|IP_RF)) { /* * Pass to IP reassembly mechanism. */ if (ip_reass_packet(&m) != 0) { /* Failed; invalid fragment(s) or packet. */ goto out; } if (m == NULL) { /* More fragments should come; silently return. */ goto out; } /* * Reassembly is done, we have the final packet. * Update cached data in local variable(s). */ ip = mtod(m, struct ip *); hlen = ip->ip_hl << 2; } M_VERIFY_PACKET(m); #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 (ipsec_used && (inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) { if (ipsec_ip_input(m, false) != 0) { goto out; } } #endif /* * Switch out to protocol's input routine. */ #if IFA_STATS if (ia) { struct in_ifaddr *_ia; /* * Keep a reference from ip_match_our_address with psref * is expensive, so explore ia here again. */ s = pserialize_read_enter(); _ia = in_get_ia(ip->ip_dst); _ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len); pserialize_read_exit(s); } #endif IP_STATINC(IP_STAT_DELIVERED); const int off = hlen, nh = ip->ip_p; (*inetsw[ip_protox[nh]].pr_input)(m, off, nh); return; out: m_put_rcvif_psref(ifp, &psref); if (m != NULL) m_freem(m); } /* * IP timer processing. */ void ip_slowtimo(void) { SOFTNET_KERNEL_LOCK_UNLESS_NET_MPSAFE(); ip_reass_slowtimo(); SOFTNET_KERNEL_UNLOCK_UNLESS_NET_MPSAFE(); } /* * IP drain processing. */ void ip_drain(void) { KERNEL_LOCK(1, NULL); ip_reass_drain(); KERNEL_UNLOCK_ONE(NULL); } /* * ip_dooptions: perform option processing on a datagram, possibly discarding * it if bad options are encountered, or forwarding it if source-routed. * * => Returns true if packet has been forwarded/freed. * => Returns false if the packet should be processed further. */ static bool ip_dooptions(struct mbuf *m) { struct ip *ip = mtod(m, struct ip *); u_char *cp, *cp0; struct ip_timestamp *ipt; struct in_ifaddr *ia; int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0; int srr_present, rr_present, ts_present; struct in_addr dst; n_time ntime; struct ifaddr *ifa = NULL; int s; srr_present = 0; rr_present = 0; ts_present = 0; dst = ip->ip_dst; cp = (u_char *)(ip + 1); cnt = (ip->ip_hl << 2) - sizeof(struct ip); for (; cnt > 0; cnt -= optlen, cp += optlen) { opt = cp[IPOPT_OPTVAL]; if (opt == IPOPT_EOL) break; if (opt == IPOPT_NOP) optlen = 1; else { if (cnt < IPOPT_OLEN + sizeof(*cp)) { code = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } optlen = cp[IPOPT_OLEN]; if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { code = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } } switch (opt) { default: break; /* * Source routing with record. * Find interface with current destination address. * If none on this machine then drop if strictly routed, * or do nothing if loosely routed. * Record interface address and bring up next address * component. If strictly routed make sure next * address is on directly accessible net. */ case IPOPT_LSRR: case IPOPT_SSRR: { struct psref psref; struct sockaddr_in ipaddr = { .sin_len = sizeof(ipaddr), .sin_family = AF_INET, }; if (ip_allowsrcrt == 0) { type = ICMP_UNREACH; code = ICMP_UNREACH_NET_PROHIB; goto bad; } if (srr_present++) { code = &cp[IPOPT_OPTVAL] - (u_char *)ip; goto bad; } if (optlen < IPOPT_OFFSET + sizeof(*cp)) { code = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { code = &cp[IPOPT_OFFSET] - (u_char *)ip; goto bad; } ipaddr.sin_addr = ip->ip_dst; s = pserialize_read_enter(); ifa = ifa_ifwithaddr(sintosa(&ipaddr)); if (ifa == NULL) { pserialize_read_exit(s); if (opt == IPOPT_SSRR) { type = ICMP_UNREACH; code = ICMP_UNREACH_SRCFAIL; goto bad; } /* * Loose routing, and not at next destination * yet; nothing to do except forward. */ break; } pserialize_read_exit(s); off--; /* 0 origin */ if ((off + sizeof(struct in_addr)) > optlen) { /* * End of source route. Should be for us. */ save_rte(m, cp, ip->ip_src); break; } /* * locate outgoing interface */ memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off), sizeof(ipaddr.sin_addr)); if (opt == IPOPT_SSRR) { ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr), &psref); if (ifa != NULL) ia = ifatoia(ifa); else ia = NULL; } else { ia = ip_rtaddr(ipaddr.sin_addr, &psref); } if (ia == NULL) { type = ICMP_UNREACH; code = ICMP_UNREACH_SRCFAIL; goto bad; } ip->ip_dst = ipaddr.sin_addr; memcpy(cp + off, &ia->ia_addr.sin_addr, sizeof(struct in_addr)); ia4_release(ia, &psref); cp[IPOPT_OFFSET] += sizeof(struct in_addr); /* * Let ip_intr's mcast routing check handle mcast pkts */ forward = !IN_MULTICAST(ip->ip_dst.s_addr); break; } case IPOPT_RR: { struct psref psref; struct sockaddr_in ipaddr = { .sin_len = sizeof(ipaddr), .sin_family = AF_INET, }; if (rr_present++) { code = &cp[IPOPT_OPTVAL] - (u_char *)ip; goto bad; } if (optlen < IPOPT_OFFSET + sizeof(*cp)) { code = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { code = &cp[IPOPT_OFFSET] - (u_char *)ip; goto bad; } /* * If no space remains, ignore. */ off--; /* 0 origin */ if ((off + sizeof(struct in_addr)) > optlen) break; memcpy((void *)&ipaddr.sin_addr, (void *)&ip->ip_dst, sizeof(ipaddr.sin_addr)); /* * locate outgoing interface; if we're the destination, * use the incoming interface (should be same). */ ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref); if (ifa == NULL) { ia = ip_rtaddr(ipaddr.sin_addr, &psref); if (ia == NULL) { type = ICMP_UNREACH; code = ICMP_UNREACH_HOST; goto bad; } } else { ia = ifatoia(ifa); } memcpy(cp + off, &ia->ia_addr.sin_addr, sizeof(struct in_addr)); ia4_release(ia, &psref); cp[IPOPT_OFFSET] += sizeof(struct in_addr); break; } case IPOPT_TS: code = cp - (u_char *)ip; ipt = (struct ip_timestamp *)cp; if (ts_present++) { code = &cp[IPOPT_OPTVAL] - (u_char *)ip; goto bad; } if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { code = (u_char *)&ipt->ipt_len - (u_char *)ip; goto bad; } if (ipt->ipt_ptr < 5) { code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; goto bad; } if (ipt->ipt_ptr > ipt->ipt_len - sizeof(int32_t)) { if (++ipt->ipt_oflw == 0) { code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; goto bad; } break; } cp0 = (cp + ipt->ipt_ptr - 1); switch (ipt->ipt_flg) { case IPOPT_TS_TSONLY: break; case IPOPT_TS_TSANDADDR: { struct ifnet *rcvif; int _s, _ss; struct sockaddr_in ipaddr = { .sin_len = sizeof(ipaddr), .sin_family = AF_INET, }; if (ipt->ipt_ptr - 1 + sizeof(n_time) + sizeof(struct in_addr) > ipt->ipt_len) { code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; goto bad; } ipaddr.sin_addr = dst; _ss = pserialize_read_enter(); rcvif = m_get_rcvif(m, &_s); if (__predict_true(rcvif != NULL)) { ifa = ifaof_ifpforaddr(sintosa(&ipaddr), rcvif); } m_put_rcvif(rcvif, &_s); if (ifa == NULL) { pserialize_read_exit(_ss); break; } ia = ifatoia(ifa); memcpy(cp0, &ia->ia_addr.sin_addr, sizeof(struct in_addr)); pserialize_read_exit(_ss); ipt->ipt_ptr += sizeof(struct in_addr); break; } case IPOPT_TS_PRESPEC: { struct sockaddr_in ipaddr = { .sin_len = sizeof(ipaddr), .sin_family = AF_INET, }; if (ipt->ipt_ptr - 1 + sizeof(n_time) + sizeof(struct in_addr) > ipt->ipt_len) { code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; goto bad; } memcpy(&ipaddr.sin_addr, cp0, sizeof(struct in_addr)); s = pserialize_read_enter(); ifa = ifa_ifwithaddr(sintosa(&ipaddr)); if (ifa == NULL) { pserialize_read_exit(s); continue; } pserialize_read_exit(s); ipt->ipt_ptr += sizeof(struct in_addr); break; } default: /* XXX can't take &ipt->ipt_flg */ code = (u_char *)&ipt->ipt_ptr - (u_char *)ip + 1; goto bad; } ntime = iptime(); cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */ memmove((char *)cp + ipt->ipt_ptr - 1, cp0, sizeof(n_time)); ipt->ipt_ptr += sizeof(n_time); } } if (forward) { struct ifnet *rcvif; struct psref _psref; if (ip_forwsrcrt == 0) { type = ICMP_UNREACH; code = ICMP_UNREACH_SRCFAIL; goto bad; } rcvif = m_get_rcvif_psref(m, &_psref); if (__predict_false(rcvif == NULL)) { type = ICMP_UNREACH; code = ICMP_UNREACH_HOST; goto bad; } ip_forward(m, 1, rcvif); m_put_rcvif_psref(rcvif, &_psref); return true; } return false; bad: icmp_error(m, type, code, 0, 0); IP_STATINC(IP_STAT_BADOPTIONS); return true; } /* * ip_rtaddr: given address of next destination (final or next hop), * return internet address info of interface to be used to get there. */ static struct in_ifaddr * ip_rtaddr(struct in_addr dst, struct psref *psref) { struct rtentry *rt; union { struct sockaddr dst; struct sockaddr_in dst4; } u; struct route *ro; sockaddr_in_init(&u.dst4, &dst, 0); ro = rtcache_percpu_getref(ipforward_rt_percpu); rt = rtcache_lookup(ro, &u.dst); if (rt == NULL) { rtcache_percpu_putref(ipforward_rt_percpu); return NULL; } ia4_acquire(ifatoia(rt->rt_ifa), psref); rtcache_unref(rt, ro); rtcache_percpu_putref(ipforward_rt_percpu); return ifatoia(rt->rt_ifa); } /* * save_rte: save incoming source route for use in replies, to be picked * up later by ip_srcroute if the receiver is interested. */ static void save_rte(struct mbuf *m, u_char *option, struct in_addr dst) { struct ip_srcrt *isr; struct m_tag *mtag; unsigned olen; olen = option[IPOPT_OLEN]; if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes)) return; mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT); if (mtag == NULL) return; isr = (struct ip_srcrt *)(mtag + 1); memcpy(isr->isr_hdr, option, olen); isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); isr->isr_dst = dst; m_tag_prepend(m, mtag); } /* * Retrieve incoming source route for use in replies, * in the same form used by setsockopt. * The first hop is placed before the options, will be removed later. */ struct mbuf * ip_srcroute(struct mbuf *m0) { struct in_addr *p, *q; struct mbuf *m; struct ip_srcrt *isr; struct m_tag *mtag; mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE); if (mtag == NULL) return NULL; isr = (struct ip_srcrt *)(mtag + 1); if (isr->isr_nhops == 0) return NULL; m = m_get(M_DONTWAIT, MT_SOOPTS); if (m == NULL) return NULL; MCLAIM(m, &inetdomain.dom_mowner); #define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr)) /* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */ m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ; /* * First save first hop for return route */ p = &(isr->isr_routes[isr->isr_nhops - 1]); *(mtod(m, struct in_addr *)) = *p--; /* * Copy option fields and padding (nop) to mbuf. */ isr->isr_nop = IPOPT_NOP; isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF; memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop, OPTSIZ); q = (struct in_addr *)(mtod(m, char *) + sizeof(struct in_addr) + OPTSIZ); #undef OPTSIZ /* * Record return path as an IP source route, * reversing the path (pointers are now aligned). */ while (p >= isr->isr_routes) { *q++ = *p--; } /* * Last hop goes to final destination. */ *q = isr->isr_dst; m_tag_delete(m0, mtag); return m; } const int inetctlerrmap[PRC_NCMDS] = { [PRC_MSGSIZE] = EMSGSIZE, [PRC_HOSTDEAD] = EHOSTDOWN, [PRC_HOSTUNREACH] = EHOSTUNREACH, [PRC_UNREACH_NET] = EHOSTUNREACH, [PRC_UNREACH_HOST] = EHOSTUNREACH, [PRC_UNREACH_PROTOCOL] = ECONNREFUSED, [PRC_UNREACH_PORT] = ECONNREFUSED, [PRC_UNREACH_SRCFAIL] = EHOSTUNREACH, [PRC_PARAMPROB] = ENOPROTOOPT, }; void ip_fasttimo(void) { if (ip_drainwanted) { ip_drain(); ip_drainwanted = 0; } } void ip_drainstub(void) { ip_drainwanted = 1; } /* * Forward a packet. If some error occurs return the sender * an icmp packet. Note we can't always generate a meaningful * icmp message because icmp doesn't have a large enough repertoire * of codes and types. * * If not forwarding, just drop the packet. This could be confusing * if ipforwarding was zero but some routing protocol was advancing * us as a gateway to somewhere. However, we must let the routing * protocol deal with that. * * The srcrt parameter indicates whether the packet is being forwarded * via a source route. */ static void ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif) { struct ip *ip = mtod(m, struct ip *); struct rtentry *rt; int error, type = 0, code = 0, destmtu = 0; struct mbuf *mcopy; n_long dest; union { struct sockaddr dst; struct sockaddr_in dst4; } u; uint64_t *ips; struct route *ro; KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software " "interrupt handler; synchronization assumptions violated"); /* * We are now in the output path. */ MCLAIM(m, &ip_tx_mowner); /* * Clear any in-bound checksum flags for this packet. */ m->m_pkthdr.csum_flags = 0; dest = 0; if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) { IP_STATINC(IP_STAT_CANTFORWARD); m_freem(m); return; } if (ip->ip_ttl <= IPTTLDEC) { icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); return; } sockaddr_in_init(&u.dst4, &ip->ip_dst, 0); ro = rtcache_percpu_getref(ipforward_rt_percpu); rt = rtcache_lookup(ro, &u.dst); if (rt == NULL) { rtcache_percpu_putref(ipforward_rt_percpu); icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0); return; } /* * Save at most 68 bytes of the packet in case * we need to generate an ICMP message to the src. * Pullup to avoid sharing mbuf cluster between m and mcopy. */ mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT); if (mcopy) mcopy = m_pullup(mcopy, ip->ip_hl << 2); ip->ip_ttl -= IPTTLDEC; /* * If forwarding packet using same interface that it came in on, * perhaps should send a redirect to sender to shortcut a hop. * Only send redirect if source is sending directly to us, * and if packet was not source routed (or has any options). * Also, don't send redirect if forwarding using a default route * or a route modified by a redirect. */ if (rt->rt_ifp == rcvif && (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && !in_nullhost(satocsin(rt_getkey(rt))->sin_addr) && ipsendredirects && !srcrt) { if (rt->rt_ifa && (ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) == ifatoia(rt->rt_ifa)->ia_subnet) { if (rt->rt_flags & RTF_GATEWAY) dest = satosin(rt->rt_gateway)->sin_addr.s_addr; else dest = ip->ip_dst.s_addr; /* * Router requirements says to only send host * redirects. */ type = ICMP_REDIRECT; code = ICMP_REDIRECT_HOST; } } rtcache_unref(rt, ro); error = ip_output(m, NULL, ro, (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)), NULL, NULL); if (error) { IP_STATINC(IP_STAT_CANTFORWARD); goto error; } ips = IP_STAT_GETREF(); ips[IP_STAT_FORWARD]++; if (type) { ips[IP_STAT_REDIRECTSENT]++; IP_STAT_PUTREF(); goto redirect; } IP_STAT_PUTREF(); if (mcopy) { #ifdef GATEWAY if (mcopy->m_flags & M_CANFASTFWD) ipflow_create(ro, mcopy); #endif m_freem(mcopy); } rtcache_percpu_putref(ipforward_rt_percpu); return; redirect: error: if (mcopy == NULL) { rtcache_percpu_putref(ipforward_rt_percpu); return; } switch (error) { case 0: /* forwarded, but need redirect */ /* type, code set above */ break; case ENETUNREACH: /* shouldn't happen, checked above */ case EHOSTUNREACH: case ENETDOWN: case EHOSTDOWN: default: type = ICMP_UNREACH; code = ICMP_UNREACH_HOST; break; case EMSGSIZE: type = ICMP_UNREACH; code = ICMP_UNREACH_NEEDFRAG; if ((rt = rtcache_validate(ro)) != NULL) { destmtu = rt->rt_ifp->if_mtu; rtcache_unref(rt, ro); } #ifdef IPSEC if (ipsec_used) ipsec_mtu(mcopy, &destmtu); #endif IP_STATINC(IP_STAT_CANTFRAG); break; case ENOBUFS: /* * Do not generate ICMP_SOURCEQUENCH as required in RFC 1812, * Requirements for IP Version 4 Routers. Source quench can * be a big problem under DoS attacks or if the underlying * interface is rate-limited. */ if (mcopy) m_freem(mcopy); rtcache_percpu_putref(ipforward_rt_percpu); return; } icmp_error(mcopy, type, code, dest, destmtu); rtcache_percpu_putref(ipforward_rt_percpu); } void ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, struct mbuf *m) { struct socket *so = inp->inp_socket; int inpflags = inp->inp_flags; if (SOOPT_TIMESTAMP(so->so_options)) mp = sbsavetimestamp(so->so_options, mp); if (inpflags & INP_RECVDSTADDR) { *mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); if (*mp) mp = &(*mp)->m_next; } if (inpflags & INP_RECVTTL) { *mp = sbcreatecontrol(&ip->ip_ttl, sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP); if (*mp) mp = &(*mp)->m_next; } struct psref psref; ifnet_t *ifp = m_get_rcvif_psref(m, &psref); if (__predict_false(ifp == NULL)) { #ifdef DIAGNOSTIC printf("%s: missing receive interface\n", __func__); #endif return; /* XXX should report error? */ } if (inpflags & INP_RECVPKTINFO) { struct in_pktinfo ipi; ipi.ipi_addr = ip->ip_dst; ipi.ipi_ifindex = ifp->if_index; *mp = sbcreatecontrol(&ipi, sizeof(ipi), IP_PKTINFO, IPPROTO_IP); if (*mp) mp = &(*mp)->m_next; } if (inpflags & INP_RECVIF) { struct sockaddr_dl sdl; sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0, NULL, 0); *mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP); if (*mp) mp = &(*mp)->m_next; } m_put_rcvif_psref(ifp, &psref); } /* * sysctl helper routine for net.inet.ip.forwsrcrt. */ static int sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS) { int error, tmp; struct sysctlnode node; node = *rnode; tmp = ip_forwsrcrt; node.sysctl_data = &tmp; error = sysctl_lookup(SYSCTLFN_CALL(&node)); if (error || newp == NULL) return (error); error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT, 0, NULL, NULL, NULL); if (error) return (error); ip_forwsrcrt = tmp; return (0); } /* * sysctl helper routine for net.inet.ip.mtudisctimeout. checks the * range of the new value and tweaks timers if it changes. */ static int sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS) { int error, tmp; struct sysctlnode node; icmp_mtudisc_lock(); node = *rnode; tmp = ip_mtudisc_timeout; node.sysctl_data = &tmp; error = sysctl_lookup(SYSCTLFN_CALL(&node)); if (error || newp == NULL) goto out; if (tmp < 0) { error = EINVAL; goto out; } ip_mtudisc_timeout = tmp; rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout); error = 0; out: icmp_mtudisc_unlock(); return error; } static int sysctl_net_inet_ip_stats(SYSCTLFN_ARGS) { return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS)); } static void sysctl_net_inet_ip_setup(struct sysctllog **clog) { sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "inet", SYSCTL_DESCR("PF_INET related settings"), NULL, 0, NULL, 0, CTL_NET, PF_INET, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "ip", SYSCTL_DESCR("IPv4 related settings"), NULL, 0, NULL, 0, CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "forwarding", SYSCTL_DESCR("Enable forwarding of INET datagrams"), NULL, 0, &ipforwarding, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_FORWARDING, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "redirect", SYSCTL_DESCR("Enable sending of ICMP redirect messages"), NULL, 0, &ipsendredirects, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_SENDREDIRECTS, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "ttl", SYSCTL_DESCR("Default TTL for an INET datagram"), NULL, 0, &ip_defttl, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_DEFTTL, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "forwsrcrt", SYSCTL_DESCR("Enable forwarding of source-routed " "datagrams"), sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_FORWSRCRT, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "directed-broadcast", SYSCTL_DESCR("Enable forwarding of broadcast datagrams"), NULL, 0, &ip_directedbcast, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_DIRECTEDBCAST, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "allowsrcrt", SYSCTL_DESCR("Accept source-routed datagrams"), NULL, 0, &ip_allowsrcrt, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_ALLOWSRCRT, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "mtudisc", SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"), NULL, 0, &ip_mtudisc, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_MTUDISC, 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, &anonportmin, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_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, &anonportmax, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_ANONPORTMAX, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "mtudisctimeout", SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"), sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_MTUDISCTIMEOUT, 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, &lowportmin, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_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, &lowportmax, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_LOWPORTMAX, CTL_EOL); #endif /* IPNOPRIVPORTS */ #if NGRE > 0 sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "grettl", SYSCTL_DESCR("Default TTL for a gre tunnel datagram"), NULL, 0, &ip_gre_ttl, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_GRE_TTL, CTL_EOL); #endif /* NGRE */ sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "checkinterface", SYSCTL_DESCR("Enable receive side of Strong ES model " "from RFC1122"), NULL, 0, &ip_checkinterface, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_CHECKINTERFACE, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "random_id", SYSCTL_DESCR("Assign random ip_id values"), NULL, 0, &ip_do_randomid, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_RANDOMID, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "do_loopback_cksum", SYSCTL_DESCR("Perform IP checksum on loopback"), NULL, 0, &ip_do_loopback_cksum, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_LOOPBACKCKSUM, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRUCT, "stats", SYSCTL_DESCR("IP statistics"), sysctl_net_inet_ip_stats, 0, NULL, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS, CTL_EOL); #if NARP 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, &ip_dad_count, 0, CTL_NET, PF_INET, IPPROTO_IP, IPCTL_DAD_COUNT, CTL_EOL); #endif /* 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_INET, IPPROTO_IP, 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_selected4, 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_reserve4, 0, NULL, 0, CTL_CREATE, CTL_EOL); } void ip_statinc(u_int stat) { KASSERT(stat < IP_NSTATS); IP_STATINC(stat); }