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2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 | /* * Copyright (c) 2003-2020 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 */ #include <sys/param.h> #include <sys/systm.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/domain.h> #include <sys/protosw.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/errno.h> #include <sys/time.h> #include <sys/kernel.h> #include <sys/syslog.h> #include <sys/sysctl.h> #include <sys/proc.h> #include <sys/kauth.h> #include <sys/mcache.h> #include <mach/mach_time.h> #include <mach/sdt.h> #include <pexpert/pexpert.h> #include <dev/random/randomdev.h> #include <net/if.h> #include <net/if_var.h> #include <net/if_types.h> #include <net/if_dl.h> #include <net/route.h> #include <net/kpi_protocol.h> #include <net/ntstat.h> #include <net/init.h> #include <net/net_osdep.h> #include <net/net_perf.h> #include <netinet/in.h> #include <netinet/in_systm.h> #if INET #include <netinet/ip.h> #include <netinet/ip_icmp.h> #endif /* INET */ #include <netinet/kpi_ipfilter_var.h> #include <netinet/ip6.h> #include <netinet/udp.h> #include <netinet6/in6_var.h> #include <netinet6/ip6_var.h> #include <netinet/in_pcb.h> #include <netinet/icmp6.h> #include <netinet6/in6_ifattach.h> #include <netinet6/nd6.h> #include <netinet6/scope6_var.h> #include <netinet6/ip6protosw.h> #if IPSEC #include <netinet6/ipsec.h> #include <netinet6/ipsec6.h> extern int ipsec_bypass; #endif /* IPSEC */ #if DUMMYNET #include <netinet/ip_dummynet.h> #endif /* DUMMYNET */ /* we need it for NLOOP. */ #include "loop.h" #if PF #include <net/pfvar.h> #endif /* PF */ #include <os/log.h> struct ip6protosw *ip6_protox[IPPROTO_MAX]; static lck_grp_attr_t *in6_ifaddr_rwlock_grp_attr; static lck_grp_t *in6_ifaddr_rwlock_grp; static lck_attr_t *in6_ifaddr_rwlock_attr; decl_lck_rw_data(, in6_ifaddr_rwlock); /* Protected by in6_ifaddr_rwlock */ struct in6_ifaddrhead in6_ifaddrhead; struct in6_ifaddrhashhead * in6_ifaddrhashtbl; uint32_t in6_ifaddrhmask; #define IN6ADDR_NHASH 61 u_int32_t in6addr_nhash = 0; /* hash table size */ u_int32_t in6addr_hashp = 0; /* next largest prime */ #define IN6_IFSTAT_REQUIRE_ALIGNED_64(f) \ _CASSERT(!(offsetof(struct in6_ifstat, f) % sizeof (uint64_t))) #define ICMP6_IFSTAT_REQUIRE_ALIGNED_64(f) \ _CASSERT(!(offsetof(struct icmp6_ifstat, f) % sizeof (uint64_t))) struct ip6stat ip6stat; decl_lck_mtx_data(, proxy6_lock); decl_lck_mtx_data(static, dad6_mutex_data); decl_lck_mtx_data(static, nd6_mutex_data); decl_lck_mtx_data(static, prefix6_mutex_data); lck_mtx_t *dad6_mutex = &dad6_mutex_data; lck_mtx_t *nd6_mutex = &nd6_mutex_data; lck_mtx_t *prefix6_mutex = &prefix6_mutex_data; #ifdef ENABLE_ADDRSEL decl_lck_mtx_data(static, addrsel_mutex_data); lck_mtx_t *addrsel_mutex = &addrsel_mutex_data; #endif static lck_attr_t *ip6_mutex_attr; static lck_grp_t *ip6_mutex_grp; static lck_grp_attr_t *ip6_mutex_grp_attr; extern int loopattach_done; extern void addrsel_policy_init(void); static int sysctl_reset_ip6_input_stats SYSCTL_HANDLER_ARGS; static int sysctl_ip6_input_measure_bins SYSCTL_HANDLER_ARGS; static int sysctl_ip6_input_getperf SYSCTL_HANDLER_ARGS; static void ip6_init_delayed(void); static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); static void in6_ifaddrhashtbl_init(void); #if NSTF extern void stfattach(void); #endif /* NSTF */ SYSCTL_DECL(_net_inet6_ip6); static uint32_t ip6_adj_clear_hwcksum = 0; SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, adj_clear_hwcksum, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_adj_clear_hwcksum, 0, "Invalidate hwcksum info when adjusting length"); static uint32_t ip6_adj_partial_sum = 1; SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, adj_partial_sum, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_adj_partial_sum, 0, "Perform partial sum adjustment of trailing bytes at IP layer"); static int ip6_input_measure = 0; SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, input_perf, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_input_measure, 0, sysctl_reset_ip6_input_stats, "I", "Do time measurement"); static uint64_t ip6_input_measure_bins = 0; SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, input_perf_bins, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_input_measure_bins, 0, sysctl_ip6_input_measure_bins, "I", "bins for chaining performance data histogram"); static net_perf_t net_perf; SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, input_perf_data, CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, sysctl_ip6_input_getperf, "S,net_perf", "IP6 input performance data (struct net_perf, net/net_perf.h)"); /* * ip6_checkinterface controls the receive side of the models for multihoming * that are discussed in RFC 1122. * * sysctl_ip6_checkinterface values are: * IP6_CHECKINTERFACE_WEAK_ES: * This corresponds to the Weak End-System model where incoming packets from * any interface are accepted provided the destination address of the incoming packet * is assigned to some interface. * * IP6_CHECKINTERFACE_HYBRID_ES: * The Hybrid End-System model use the Strong End-System for tunnel interfaces * (ipsec and utun) and the weak End-System model for other interfaces families. * This prevents a rogue middle box to probe for signs of TCP connections * that use the tunnel interface. * * IP6_CHECKINTERFACE_STRONG_ES: * The Strong model model requires the packet arrived on an interface that * is assigned the destination address of the packet. * * Since the routing table and transmit implementation do not implement the Strong ES model, * setting this to a value different from IP6_CHECKINTERFACE_WEAK_ES may lead to unexpected results. * * When forwarding is enabled, the system reverts to the Weak ES model as a router * is expected by design to receive packets from several interfaces to the same address. */ #define IP6_CHECKINTERFACE_WEAK_ES 0 #define IP6_CHECKINTERFACE_HYBRID_ES 1 #define IP6_CHECKINTERFACE_STRONG_ES 2 static int ip6_checkinterface = IP6_CHECKINTERFACE_HYBRID_ES; static int sysctl_ip6_checkinterface SYSCTL_HANDLER_ARGS; SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, check_interface, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, sysctl_ip6_checkinterface, "I", "Verify packet arrives on correct interface"); #if (DEBUG || DEVELOPMENT) #define IP6_CHECK_IFDEBUG 1 #else #define IP6_CHECK_IFDEBUG 0 #endif /* (DEBUG || DEVELOPMENT) */ static int ip6_checkinterface_debug = IP6_CHECK_IFDEBUG; SYSCTL_INT(_net_inet6_ip6, OID_AUTO, checkinterface_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_checkinterface_debug, IP6_CHECK_IFDEBUG, ""); typedef enum ip6_check_if_result { IP6_CHECK_IF_NONE = 0, IP6_CHECK_IF_OURS = 1, IP6_CHECK_IF_DROP = 2, IP6_CHECK_IF_FORWARD = 3 } ip6_check_if_result_t; static ip6_check_if_result_t ip6_input_check_interface(struct mbuf *, struct ip6_hdr *, struct ifnet *, struct route_in6 *rin6, struct ifnet **); /* * On platforms which require strict alignment (currently for anything but * i386 or x86_64), check if the IP header pointer is 32-bit aligned; if not, * copy the contents of the mbuf chain into a new chain, and free the original * one. Create some head room in the first mbuf of the new chain, in case * it's needed later on. * * RFC 2460 says that IPv6 headers are 64-bit aligned, but network interfaces * mostly align to 32-bit boundaries. Care should be taken never to use 64-bit * load/store operations on the fields in IPv6 headers. */ #if defined(__i386__) || defined(__x86_64__) #define IP6_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { } while (0) #else /* !__i386__ && !__x86_64__ */ #define IP6_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { \ if (!IP6_HDR_ALIGNED_P(mtod(_m, caddr_t))) { \ struct mbuf *_n; \ struct ifnet *__ifp = (_ifp); \ atomic_add_64(&(__ifp)->if_alignerrs, 1); \ if (((_m)->m_flags & M_PKTHDR) && \ (_m)->m_pkthdr.pkt_hdr != NULL) \ (_m)->m_pkthdr.pkt_hdr = NULL; \ _n = m_defrag_offset(_m, max_linkhdr, M_NOWAIT); \ if (_n == NULL) { \ ip6stat.ip6s_toosmall++; \ m_freem(_m); \ (_m) = NULL; \ _action; \ } else { \ VERIFY(_n != (_m)); \ (_m) = _n; \ } \ } \ } while (0) #endif /* !__i386__ && !__x86_64__ */ static void ip6_proto_input(protocol_family_t protocol, mbuf_t packet) { #pragma unused(protocol) #if INET struct timeval start_tv; if (ip6_input_measure) { net_perf_start_time(&net_perf, &start_tv); } #endif /* INET */ ip6_input(packet); #if INET if (ip6_input_measure) { net_perf_measure_time(&net_perf, &start_tv, 1); net_perf_histogram(&net_perf, 1); } #endif /* INET */ } /* * IP6 initialization: fill in IP6 protocol switch table. * All protocols not implemented in kernel go to raw IP6 protocol handler. */ void ip6_init(struct ip6protosw *pp, struct domain *dp) { static int ip6_initialized = 0; struct protosw *pr; struct timeval tv; int i; domain_unguard_t unguard; domain_proto_mtx_lock_assert_held(); VERIFY((pp->pr_flags & (PR_INITIALIZED | PR_ATTACHED)) == PR_ATTACHED); _CASSERT((sizeof(struct ip6_hdr) + sizeof(struct icmp6_hdr)) <= _MHLEN); if (ip6_initialized) { return; } ip6_initialized = 1; eventhandler_lists_ctxt_init(&in6_evhdlr_ctxt); (void)EVENTHANDLER_REGISTER(&in6_evhdlr_ctxt, in6_event, in6_eventhdlr_callback, eventhandler_entry_dummy_arg, EVENTHANDLER_PRI_ANY); eventhandler_lists_ctxt_init(&in6_clat46_evhdlr_ctxt); (void)EVENTHANDLER_REGISTER(&in6_clat46_evhdlr_ctxt, in6_clat46_event, in6_clat46_eventhdlr_callback, eventhandler_entry_dummy_arg, EVENTHANDLER_PRI_ANY); for (i = 0; i < IN6_EVENT_MAX; i++) { VERIFY(in6_event2kev_array[i].in6_event_code == i); } pr = pffindproto_locked(PF_INET6, IPPROTO_RAW, SOCK_RAW); if (pr == NULL) { panic("%s: Unable to find [PF_INET6,IPPROTO_RAW,SOCK_RAW]\n", __func__); /* NOTREACHED */ } /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ for (i = 0; i < IPPROTO_MAX; i++) { ip6_protox[i] = (struct ip6protosw *)pr; } /* * Cycle through IP protocols and put them into the appropriate place * in ip6_protox[], skipping protocols IPPROTO_{IP,RAW}. */ VERIFY(dp == inet6domain && dp->dom_family == PF_INET6); TAILQ_FOREACH(pr, &dp->dom_protosw, pr_entry) { VERIFY(pr->pr_domain == dp); if (pr->pr_protocol != 0 && pr->pr_protocol != IPPROTO_RAW) { /* Be careful to only index valid IP protocols. */ if (pr->pr_protocol < IPPROTO_MAX) { ip6_protox[pr->pr_protocol] = (struct ip6protosw *)pr; } } } ip6_mutex_grp_attr = lck_grp_attr_alloc_init(); ip6_mutex_grp = lck_grp_alloc_init("ip6", ip6_mutex_grp_attr); ip6_mutex_attr = lck_attr_alloc_init(); lck_mtx_init(dad6_mutex, ip6_mutex_grp, ip6_mutex_attr); lck_mtx_init(nd6_mutex, ip6_mutex_grp, ip6_mutex_attr); lck_mtx_init(prefix6_mutex, ip6_mutex_grp, ip6_mutex_attr); scope6_init(ip6_mutex_grp, ip6_mutex_attr); #ifdef ENABLE_ADDRSEL lck_mtx_init(addrsel_mutex, ip6_mutex_grp, ip6_mutex_attr); #endif lck_mtx_init(&proxy6_lock, ip6_mutex_grp, ip6_mutex_attr); in6_ifaddr_rwlock_grp_attr = lck_grp_attr_alloc_init(); in6_ifaddr_rwlock_grp = lck_grp_alloc_init("in6_ifaddr_rwlock", in6_ifaddr_rwlock_grp_attr); in6_ifaddr_rwlock_attr = lck_attr_alloc_init(); lck_rw_init(&in6_ifaddr_rwlock, in6_ifaddr_rwlock_grp, in6_ifaddr_rwlock_attr); TAILQ_INIT(&in6_ifaddrhead); in6_ifaddrhashtbl_init(); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_receive); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_hdrerr); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_toobig); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_noroute); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_addrerr); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_protounknown); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_truncated); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_discard); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_deliver); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_forward); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_request); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_discard); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragok); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragfail); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_fragcreat); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_reqd); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_ok); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_reass_fail); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mcast); IN6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mcast); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_msg); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_error); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_dstunreach); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_adminprohib); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_timeexceed); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_paramprob); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_pkttoobig); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_echo); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_echoreply); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_routersolicit); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_routeradvert); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_neighborsolicit); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_neighboradvert); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_redirect); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mldquery); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mldreport); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_in_mlddone); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_msg); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_error); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_dstunreach); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_adminprohib); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_timeexceed); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_paramprob); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_pkttoobig); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_echo); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_echoreply); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_routersolicit); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_routeradvert); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_neighborsolicit); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_neighboradvert); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_redirect); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mldquery); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mldreport); ICMP6_IFSTAT_REQUIRE_ALIGNED_64(ifs6_out_mlddone); getmicrotime(&tv); ip6_desync_factor = (RandomULong() ^ tv.tv_usec) % MAX_TEMP_DESYNC_FACTOR; PE_parse_boot_argn("ip6_checkinterface", &i, sizeof(i)); switch (i) { case IP6_CHECKINTERFACE_WEAK_ES: case IP6_CHECKINTERFACE_HYBRID_ES: case IP6_CHECKINTERFACE_STRONG_ES: ip6_checkinterface = i; break; default: break; } in6_ifaddr_init(); ip6_moptions_init(); nd6_init(); frag6_init(); icmp6_init(NULL, dp); addrsel_policy_init(); /* * P2P interfaces often route the local address to the loopback * interface. At this point, lo0 hasn't been initialized yet, which * means that we need to delay the IPv6 configuration of lo0. */ net_init_add(ip6_init_delayed); unguard = domain_unguard_deploy(); i = proto_register_input(PF_INET6, ip6_proto_input, NULL, 0); if (i != 0) { panic("%s: failed to register PF_INET6 protocol: %d\n", __func__, i); /* NOTREACHED */ } domain_unguard_release(unguard); } static void ip6_init_delayed(void) { (void) in6_ifattach_prelim(lo_ifp); /* timer for regeneranation of temporary addresses randomize ID */ timeout(in6_tmpaddrtimer, NULL, (ip6_temp_preferred_lifetime - ip6_desync_factor - ip6_temp_regen_advance) * hz); #if NSTF stfattach(); #endif /* NSTF */ } static void ip6_input_adjust(struct mbuf *m, struct ip6_hdr *ip6, uint32_t plen, struct ifnet *inifp) { boolean_t adjust = TRUE; uint32_t tot_len = sizeof(*ip6) + plen; ASSERT(m_pktlen(m) > tot_len); /* * Invalidate hardware checksum info if ip6_adj_clear_hwcksum * is set; useful to handle buggy drivers. Note that this * should not be enabled by default, as we may get here due * to link-layer padding. */ if (ip6_adj_clear_hwcksum && (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) && !(inifp->if_flags & IFF_LOOPBACK) && !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID; m->m_pkthdr.csum_data = 0; ip6stat.ip6s_adj_hwcsum_clr++; } /* * If partial checksum information is available, subtract * out the partial sum of postpended extraneous bytes, and * update the checksum metadata accordingly. By doing it * here, the upper layer transport only needs to adjust any * prepended extraneous bytes (else it will do both.) */ if (ip6_adj_partial_sum && (m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PARTIAL)) == (CSUM_DATA_VALID | CSUM_PARTIAL)) { m->m_pkthdr.csum_rx_val = m_adj_sum16(m, m->m_pkthdr.csum_rx_start, m->m_pkthdr.csum_rx_start, (tot_len - m->m_pkthdr.csum_rx_start), m->m_pkthdr.csum_rx_val); } else if ((m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PARTIAL)) == (CSUM_DATA_VALID | CSUM_PARTIAL)) { /* * If packet has partial checksum info and we decided not * to subtract the partial sum of postpended extraneous * bytes here (not the default case), leave that work to * be handled by the other layers. For now, only TCP, UDP * layers are capable of dealing with this. For all other * protocols (including fragments), trim and ditch the * partial sum as those layers might not implement partial * checksumming (or adjustment) at all. */ if (ip6->ip6_nxt == IPPROTO_TCP || ip6->ip6_nxt == IPPROTO_UDP) { adjust = FALSE; } else { m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID; m->m_pkthdr.csum_data = 0; ip6stat.ip6s_adj_hwcsum_clr++; } } if (adjust) { ip6stat.ip6s_adj++; if (m->m_len == m->m_pkthdr.len) { m->m_len = tot_len; m->m_pkthdr.len = tot_len; } else { m_adj(m, tot_len - m->m_pkthdr.len); } } } static ip6_check_if_result_t ip6_input_check_interface(struct mbuf *m, struct ip6_hdr *ip6, struct ifnet *inifp, struct route_in6 *rin6, struct ifnet **deliverifp) { struct in6_ifaddr *ia6 = NULL; struct in6_addr tmp_dst = ip6->ip6_dst; /* copy to avoid unaligned access */ struct in6_ifaddr *best_ia6 = NULL; ip6_check_if_result_t result = IP6_CHECK_IF_NONE; *deliverifp = NULL; /* * Check for exact addresses in the hash bucket. */ lck_rw_lock_shared(&in6_ifaddr_rwlock); TAILQ_FOREACH(ia6, IN6ADDR_HASH(&tmp_dst), ia6_hash) { /* * TODO: should we accept loopbacl */ if (IN6_ARE_ADDR_EQUAL(&ia6->ia_addr.sin6_addr, &tmp_dst)) { if ((ia6->ia6_flags & (IN6_IFF_NOTREADY | IN6_IFF_CLAT46))) { continue; } best_ia6 = ia6; if (ia6->ia_ifp == inifp) { /* * TODO: should we also accept locally originated packets * or from loopback ??? */ break; } /* * Continue the loop in case there's a exact match with another * interface */ } } if (best_ia6 != NULL) { if (best_ia6->ia_ifp != inifp && ip6_forwarding == 0 && ((ip6_checkinterface == IP6_CHECKINTERFACE_HYBRID_ES && (best_ia6->ia_ifp->if_family == IFNET_FAMILY_IPSEC || best_ia6->ia_ifp->if_family == IFNET_FAMILY_UTUN)) || ip6_checkinterface == IP6_CHECKINTERFACE_STRONG_ES)) { /* * Drop when interface address check is strict and forwarding * is disabled */ result = IP6_CHECK_IF_DROP; } else { result = IP6_CHECK_IF_OURS; *deliverifp = best_ia6->ia_ifp; ip6_setdstifaddr_info(m, 0, best_ia6); } } lck_rw_done(&in6_ifaddr_rwlock); if (result == IP6_CHECK_IF_NONE) { /* * Slow path: route lookup. */ struct sockaddr_in6 *dst6; dst6 = SIN6(&rin6->ro_dst); dst6->sin6_len = sizeof(struct sockaddr_in6); dst6->sin6_family = AF_INET6; dst6->sin6_addr = ip6->ip6_dst; rtalloc_scoped_ign((struct route *)rin6, RTF_PRCLONING, IFSCOPE_NONE); if (rin6->ro_rt != NULL) { RT_LOCK_SPIN(rin6->ro_rt); } #define rt6_key(r) (SIN6((r)->rt_nodes->rn_key)) /* * 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. * * XXX: some OSes automatically make a cloned route for the destination * of an outgoing packet. If the outgoing interface of the packet * is a loopback one, the kernel would consider the packet to be * accepted, even if we have no such address assinged on the interface. * We check the cloned flag of the route entry to reject such cases, * assuming that route entries for our own addresses are not made by * cloning (it should be true because in6_addloop explicitly installs * the host route). However, we might have to do an explicit check * while it would be less efficient. Or, should we rather install a * reject route for such a case? */ if (rin6->ro_rt != NULL && (rin6->ro_rt->rt_flags & (RTF_HOST | RTF_GATEWAY)) == RTF_HOST && #if RTF_WASCLONED !(rin6->ro_rt->rt_flags & RTF_WASCLONED) && #endif rin6->ro_rt->rt_ifp->if_type == IFT_LOOP) { ia6 = (struct in6_ifaddr *)rin6->ro_rt->rt_ifa; /* * Packets to a tentative, duplicated, or somehow invalid * address must not be accepted. * * For performance, test without acquiring the address lock; * a lot of things in the address are set once and never * changed (e.g. ia_ifp.) */ if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { /* this address is ready */ result = IP6_CHECK_IF_OURS; *deliverifp = ia6->ia_ifp; /* correct? */ /* * record dst address information into mbuf. */ (void) ip6_setdstifaddr_info(m, 0, ia6); } } if (rin6->ro_rt != NULL) { RT_UNLOCK(rin6->ro_rt); } } if (result == IP6_CHECK_IF_NONE) { if (ip6_forwarding == 0) { result = IP6_CHECK_IF_DROP; } else { result = IP6_CHECK_IF_FORWARD; ip6_setdstifaddr_info(m, inifp->if_index, NULL); } } if (result == IP6_CHECK_IF_OURS && *deliverifp != inifp) { ASSERT(*deliverifp != NULL); ip6stat.ip6s_rcv_if_weak_match++; /* Logging is too noisy when forwarding is enabled */ if (ip6_checkinterface_debug != IP6_CHECKINTERFACE_WEAK_ES && ip6_forwarding != 0) { char src_str[MAX_IPv6_STR_LEN]; char dst_str[MAX_IPv6_STR_LEN]; inet_ntop(AF_INET6, &ip6->ip6_src, src_str, sizeof(src_str)); inet_ntop(AF_INET6, &ip6->ip6_dst, dst_str, sizeof(dst_str)); os_log_info(OS_LOG_DEFAULT, "%s: weak ES interface match to %s for packet from %s to %s proto %u received via %s", __func__, (*deliverifp)->if_xname, src_str, dst_str, ip6->ip6_nxt, inifp->if_xname); } } else if (result == IP6_CHECK_IF_DROP) { ip6stat.ip6s_rcv_if_no_match++; if (ip6_checkinterface_debug > 0) { char src_str[MAX_IPv6_STR_LEN]; char dst_str[MAX_IPv6_STR_LEN]; inet_ntop(AF_INET6, &ip6->ip6_src, src_str, sizeof(src_str)); inet_ntop(AF_INET6, &ip6->ip6_dst, dst_str, sizeof(dst_str)); os_log(OS_LOG_DEFAULT, "%s: no interface match for packet from %s to %s proto %u received via %s", __func__, src_str, dst_str, ip6->ip6_nxt, inifp->if_xname); } } return result; } void ip6_input(struct mbuf *m) { struct ip6_hdr *ip6; int off = sizeof(struct ip6_hdr), nest; u_int32_t plen; u_int32_t rtalert = ~0; int nxt = 0, ours = 0; struct ifnet *inifp, *deliverifp = NULL; ipfilter_t inject_ipfref = NULL; int seen = 1; #if DUMMYNET struct m_tag *tag; struct ip_fw_args args = {}; #endif /* DUMMYNET */ struct route_in6 rin6 = {}; /* * Check if the packet we received is valid after interface filter * processing */ MBUF_INPUT_CHECK(m, m->m_pkthdr.rcvif); inifp = m->m_pkthdr.rcvif; VERIFY(inifp != NULL); /* Perform IP header alignment fixup, if needed */ IP6_HDR_ALIGNMENT_FIXUP(m, inifp, return ); m->m_pkthdr.pkt_flags &= ~PKTF_FORWARDED; #if IPSEC /* * should the inner packet be considered authentic? * see comment in ah4_input(). */ m->m_flags &= ~M_AUTHIPHDR; m->m_flags &= ~M_AUTHIPDGM; #endif /* IPSEC */ /* * make sure we don't have onion peering information into m_aux. */ ip6_delaux(m); #if DUMMYNET if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) { struct dn_pkt_tag *dn_tag; dn_tag = (struct dn_pkt_tag *)(tag + 1); args.fwa_pf_rule = dn_tag->dn_pf_rule; m_tag_delete(m, tag); } if (args.fwa_pf_rule) { ip6 = mtod(m, struct ip6_hdr *); /* In case PF got disabled */ goto check_with_pf; } #endif /* DUMMYNET */ /* * No need to proccess packet twice if we've already seen it. */ inject_ipfref = ipf_get_inject_filter(m); if (inject_ipfref != NULL) { ip6 = mtod(m, struct ip6_hdr *); nxt = ip6->ip6_nxt; seen = 0; goto injectit; } else { seen = 1; } /* * mbuf statistics */ if (m->m_flags & M_EXT) { if (m->m_next != NULL) { ip6stat.ip6s_mext2m++; } else { ip6stat.ip6s_mext1++; } } else { #define M2MMAX (sizeof (ip6stat.ip6s_m2m) / sizeof (ip6stat.ip6s_m2m[0])) if (m->m_next != NULL) { if (m->m_pkthdr.pkt_flags & PKTF_LOOP) { /* XXX */ ip6stat.ip6s_m2m[ifnet_index(lo_ifp)]++; } else if (inifp->if_index < M2MMAX) { ip6stat.ip6s_m2m[inifp->if_index]++; } else { ip6stat.ip6s_m2m[0]++; } } else { ip6stat.ip6s_m1++; } #undef M2MMAX } /* * Drop the packet if IPv6 operation is disabled on the interface. */ if (inifp->if_eflags & IFEF_IPV6_DISABLED) { goto bad; } in6_ifstat_inc_na(inifp, ifs6_in_receive); ip6stat.ip6s_total++; /* * L2 bridge code and some other code can return mbuf chain * that does not conform to KAME requirement. too bad. * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? */ if (m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { struct mbuf *n; MGETHDR(n, M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (n) { M_COPY_PKTHDR(n, m); } if (n && m->m_pkthdr.len > MHLEN) { MCLGET(n, M_DONTWAIT); if ((n->m_flags & M_EXT) == 0) { m_freem(n); n = NULL; } } if (n == NULL) { goto bad; } m_copydata(m, 0, m->m_pkthdr.len, mtod(n, caddr_t)); n->m_len = m->m_pkthdr.len; m_freem(m); m = n; } IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), { goto done; }); if (m->m_len < sizeof(struct ip6_hdr)) { if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == 0) { ip6stat.ip6s_toosmall++; in6_ifstat_inc(inifp, ifs6_in_hdrerr); goto done; } } ip6 = mtod(m, struct ip6_hdr *); if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { ip6stat.ip6s_badvers++; in6_ifstat_inc(inifp, ifs6_in_hdrerr); goto bad; } ip6stat.ip6s_nxthist[ip6->ip6_nxt]++; /* * Check against address spoofing/corruption. */ if (!(m->m_pkthdr.pkt_flags & PKTF_LOOP) && IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src)) { ip6stat.ip6s_badscope++; in6_ifstat_inc(inifp, ifs6_in_addrerr); goto bad; } 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(inifp, ifs6_in_addrerr); goto bad; } if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { /* * In this case, the packet should come from the loopback * interface. However, we cannot just check the if_flags, * because ip6_mloopback() passes the "actual" interface * as the outgoing/incoming interface. */ ip6stat.ip6s_badscope++; in6_ifstat_inc(inifp, 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(inifp, 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(inifp, ifs6_in_addrerr); goto bad; } #endif /* * Naively assume we can attribute inbound data to the route we would * use to send to this destination. Asymetric routing breaks this * assumption, but it still allows us to account for traffic from * a remote node in the routing table. * this has a very significant performance impact so we bypass * if nstat_collect is disabled. We may also bypass if the * protocol is tcp in the future because tcp will have a route that * we can use to attribute the data to. That does mean we would not * account for forwarded tcp traffic. */ if (nstat_collect) { struct rtentry *rte = ifnet_cached_rtlookup_inet6(inifp, &ip6->ip6_src); if (rte != NULL) { nstat_route_rx(rte, 1, m->m_pkthdr.len, 0); rtfree(rte); } } #if DUMMYNET check_with_pf: #endif /* DUMMYNET */ #if PF /* Invoke inbound packet filter */ if (PF_IS_ENABLED) { int error; #if DUMMYNET error = pf_af_hook(inifp, NULL, &m, AF_INET6, TRUE, &args); #else /* !DUMMYNET */ error = pf_af_hook(inifp, NULL, &m, AF_INET6, TRUE, NULL); #endif /* !DUMMYNET */ if (error != 0 || m == NULL) { if (m != NULL) { panic("%s: unexpected packet %p\n", __func__, m); /* NOTREACHED */ } /* Already freed by callee */ goto done; } ip6 = mtod(m, struct ip6_hdr *); } #endif /* PF */ /* drop packets if interface ID portion is already filled */ if (!(inifp->if_flags & IFF_LOOPBACK) && !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) && ip6->ip6_src.s6_addr16[1]) { ip6stat.ip6s_badscope++; goto bad; } if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst) && ip6->ip6_dst.s6_addr16[1]) { ip6stat.ip6s_badscope++; goto bad; } } if (m->m_pkthdr.pkt_flags & PKTF_IFAINFO) { if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { ip6->ip6_src.s6_addr16[1] = htons(m->m_pkthdr.src_ifindex); } if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) { ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.dst_ifindex); } } else { if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { ip6->ip6_src.s6_addr16[1] = htons(inifp->if_index); } if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) { ip6->ip6_dst.s6_addr16[1] = htons(inifp->if_index); } } /* * Multicast check */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { struct in6_multi *in6m = NULL; in6_ifstat_inc_na(inifp, ifs6_in_mcast); /* * See if we belong to the destination multicast group on the * arrival interface. */ in6_multihead_lock_shared(); IN6_LOOKUP_MULTI(&ip6->ip6_dst, inifp, in6m); in6_multihead_lock_done(); if (in6m != NULL) { IN6M_REMREF(in6m); ours = 1; } else if (!nd6_prproxy) { ip6stat.ip6s_notmember++; ip6stat.ip6s_cantforward++; in6_ifstat_inc(inifp, ifs6_in_discard); goto bad; } deliverifp = inifp; /* * record dst address information into mbuf, 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, etc.) */ if (deliverifp != NULL) { struct in6_ifaddr *ia6 = NULL; ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); if (ia6 != NULL) { (void) ip6_setdstifaddr_info(m, 0, ia6); IFA_REMREF(&ia6->ia_ifa); } else { (void) ip6_setdstifaddr_info(m, inifp->if_index, NULL); } } goto hbhcheck; } else { /* * Unicast check */ ip6_check_if_result_t check_if_result = IP6_CHECK_IF_NONE; check_if_result = ip6_input_check_interface(m, ip6, inifp, &rin6, &deliverifp); ASSERT(check_if_result != IP6_CHECK_IF_NONE); if (check_if_result == IP6_CHECK_IF_OURS) { ours = 1; goto hbhcheck; } else if (check_if_result == IP6_CHECK_IF_DROP) { goto bad; } } /* * 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(inifp, ifs6_in_discard); /* * Raise a kernel event if the packet received on cellular * interface is not intended for local host. * For now limit it to ICMPv6 packets. */ if (inifp->if_type == IFT_CELLULAR && ip6->ip6_nxt == IPPROTO_ICMPV6) { in6_ifstat_inc(inifp, ifs6_cantfoward_icmp6); } goto bad; } hbhcheck: /* * 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; /* * Mark the packet to imply that HBH option has been checked. * This can only be true is the packet came in unfragmented * or if the option is in the first fragment */ m->m_pkthdr.pkt_flags |= PKTF_HBH_CHKED; if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) { #if 0 /* touches NULL pointer */ in6_ifstat_inc(inifp, ifs6_in_discard); #endif goto done; /* 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(inifp, ifs6_in_discard); in6_ifstat_inc(inifp, ifs6_in_hdrerr); icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, (int)((caddr_t)&ip6->ip6_plen - (caddr_t)ip6)); goto done; } /* ip6_hopopts_input() ensures that mbuf is contiguous */ hbh = (struct ip6_hbh *)(ip6 + 1); nxt = hbh->ip6h_nxt; /* * If we are acting as a router and the packet contains a * router alert option, see if we know the option value. * Currently, we only support the option value for MLD, in which * case we should pass the packet to the multicast routing * daemon. */ if (rtalert != ~0 && ip6_forwarding) { switch (rtalert) { case IP6OPT_RTALERT_MLD: ours = 1; break; default: /* * RFC2711 requires unrecognized values must be * silently ignored. */ break; } } } 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(inifp, ifs6_in_truncated); goto bad; } if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { ip6_input_adjust(m, ip6, plen, inifp); } /* * Forward if desirable. */ if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { if (!ours && nd6_prproxy) { /* * If this isn't for us, this might be a Neighbor * Solicitation (dst is solicited-node multicast) * against an address in one of the proxied prefixes; * if so, claim the packet and let icmp6_input() * handle the rest. */ ours = nd6_prproxy_isours(m, ip6, NULL, IFSCOPE_NONE); VERIFY(!ours || (m->m_pkthdr.pkt_flags & PKTF_PROXY_DST)); } if (!ours) { goto bad; } } else if (!ours) { /* * The unicast forwarding function might return the packet * if we are proxying prefix(es), and if the packet is an * ICMPv6 packet that has failed the zone checks, but is * targetted towards a proxied address (this is optimized by * way of RTF_PROXY test.) If so, claim the packet as ours * and let icmp6_input() handle the rest. The packet's hop * limit value is kept intact (it's not decremented). This * is for supporting Neighbor Unreachability Detection between * proxied nodes on different links (src is link-local, dst * is target address.) */ if ((m = ip6_forward(m, &rin6, 0)) == NULL) { goto done; } VERIFY(rin6.ro_rt != NULL); VERIFY(m->m_pkthdr.pkt_flags & PKTF_PROXY_DST); deliverifp = rin6.ro_rt->rt_ifp; ours = 1; } 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(inifp, ifs6_in_addrerr); goto bad; } /* * Tell launch routine the next header */ ip6stat.ip6s_delivered++; in6_ifstat_inc_na(deliverifp, ifs6_in_deliver); injectit: nest = 0; /* * Perform IP header alignment fixup again, if needed. Note that * we do it once for the outermost protocol, and we assume each * protocol handler wouldn't mess with the alignment afterwards. */ IP6_HDR_ALIGNMENT_FIXUP(m, inifp, return ); while (nxt != IPPROTO_DONE) { struct ipfilter *filter; int (*pr_input)(struct mbuf **, int *, int); /* * This would imply either IPPROTO_HOPOPTS was not the first * option or it did not come in the first fragment. */ if (nxt == IPPROTO_HOPOPTS && (m->m_pkthdr.pkt_flags & PKTF_HBH_CHKED) == 0) { /* * This implies that HBH option was not contained * in the first fragment */ ip6stat.ip6s_badoptions++; goto bad; } if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) { ip6stat.ip6s_toomanyhdr++; 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(inifp, ifs6_in_truncated); goto bad; } #if 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_bypass == 0) && (ip6_protox[nxt]->pr_flags & PR_LASTHDR) != 0) { if (ipsec6_in_reject(m, NULL)) { IPSEC_STAT_INCREMENT(ipsec6stat.in_polvio); goto bad; } } #endif /* IPSEC */ /* * Call IP filter */ if (!TAILQ_EMPTY(&ipv6_filters) && !IFNET_IS_INTCOPROC(inifp)) { ipf_ref(); TAILQ_FOREACH(filter, &ipv6_filters, ipf_link) { if (seen == 0) { if ((struct ipfilter *)inject_ipfref == filter) { seen = 1; } } else if (filter->ipf_filter.ipf_input) { errno_t result; result = filter->ipf_filter.ipf_input( filter->ipf_filter.cookie, (mbuf_t *)&m, off, (uint8_t)nxt); if (result == EJUSTRETURN) { ipf_unref(); goto done; } if (result != 0) { ipf_unref(); goto bad; } } } ipf_unref(); } DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL, struct ip6_hdr *, ip6, struct ifnet *, inifp, struct ip *, NULL, struct ip6_hdr *, ip6); if ((pr_input = ip6_protox[nxt]->pr_input) == NULL) { m_freem(m); m = NULL; nxt = IPPROTO_DONE; } else if (!(ip6_protox[nxt]->pr_flags & PR_PROTOLOCK)) { lck_mtx_lock(inet6_domain_mutex); nxt = pr_input(&m, &off, nxt); lck_mtx_unlock(inet6_domain_mutex); } else { nxt = pr_input(&m, &off, nxt); } } done: ROUTE_RELEASE(&rin6); return; bad: m_freem(m); goto done; } void ip6_setsrcifaddr_info(struct mbuf *m, uint32_t src_idx, struct in6_ifaddr *ia6) { VERIFY(m->m_flags & M_PKTHDR); /* * If the source ifaddr is specified, pick up the information * from there; otherwise just grab the passed-in ifindex as the * caller may not have the ifaddr available. */ if (ia6 != NULL) { m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; m->m_pkthdr.src_ifindex = ia6->ia_ifp->if_index; /* See IN6_IFF comments in in6_var.h */ m->m_pkthdr.src_iff = (ia6->ia6_flags & 0xffff); } else { m->m_pkthdr.src_iff = 0; m->m_pkthdr.src_ifindex = (uint16_t)src_idx; if (src_idx != 0) { m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; } } } void ip6_setdstifaddr_info(struct mbuf *m, uint32_t dst_idx, struct in6_ifaddr *ia6) { VERIFY(m->m_flags & M_PKTHDR); /* * If the destination ifaddr is specified, pick up the information * from there; otherwise just grab the passed-in ifindex as the * caller may not have the ifaddr available. */ if (ia6 != NULL) { m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; m->m_pkthdr.dst_ifindex = ia6->ia_ifp->if_index; /* See IN6_IFF comments in in6_var.h */ m->m_pkthdr.dst_iff = (ia6->ia6_flags & 0xffff); } else { m->m_pkthdr.dst_iff = 0; m->m_pkthdr.dst_ifindex = (uint16_t)dst_idx; if (dst_idx != 0) { m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; } } } int ip6_getsrcifaddr_info(struct mbuf *m, uint32_t *src_idx, uint32_t *ia6f) { VERIFY(m->m_flags & M_PKTHDR); if (!(m->m_pkthdr.pkt_flags & PKTF_IFAINFO)) { return -1; } if (src_idx != NULL) { *src_idx = m->m_pkthdr.src_ifindex; } if (ia6f != NULL) { *ia6f = m->m_pkthdr.src_iff; } return 0; } int ip6_getdstifaddr_info(struct mbuf *m, uint32_t *dst_idx, uint32_t *ia6f) { VERIFY(m->m_flags & M_PKTHDR); if (!(m->m_pkthdr.pkt_flags & PKTF_IFAINFO)) { return -1; } if (dst_idx != NULL) { *dst_idx = m->m_pkthdr.dst_ifindex; } if (ia6f != NULL) { *ia6f = m->m_pkthdr.dst_iff; } return 0; } /* * Hop-by-Hop options header processing. If a valid jumbo payload option is * included, the real payload length will be stored in plenp. */ static int ip6_hopopts_input(uint32_t *plenp, uint32_t *rtalertp, struct mbuf **mp, int *offp) { struct mbuf *m = *mp; int off = *offp, hbhlen; struct ip6_hbh *hbh; u_int8_t *opt; /* validation of the length of the header */ IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), return (-1)); hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); hbhlen = (hbh->ip6h_len + 1) << 3; IP6_EXTHDR_CHECK(m, off, hbhlen, return (-1)); hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); off += hbhlen; hbhlen -= sizeof(struct ip6_hbh); opt = (u_int8_t *)hbh + 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_ROUTER_ALERT: /* 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, (int)(erroff + opt + 1 - opthead)); return -1; } optlen = IP6OPT_RTALERT_LEN; bcopy((caddr_t)(opt + 2), (caddr_t)&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, (int)(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, (int)(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, (int)(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, (int)(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(uint8_t *optp, struct mbuf *m, size_t 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, (int)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, (int)off); } return -1; } m_freem(m); /* XXX: NOTREACHED */ return -1; } /* * Create the "control" list for this pcb. * These functions will not modify mbuf chain at all. * * With KAME mbuf chain restriction: * 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. * * ip6_savecontrol_v4 will handle those options that are possible to be * set on a v4-mapped socket. * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those * options and handle the v6-only ones itself. */ struct mbuf ** ip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, int *v4only) { struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { struct timeval tv; getmicrotime(&tv); mp = sbcreatecontrol_mbuf((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, SOL_SOCKET, mp); if (*mp == NULL) { return NULL; } } if ((inp->inp_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0) { uint64_t time; time = mach_absolute_time(); mp = sbcreatecontrol_mbuf((caddr_t)&time, sizeof(time), SCM_TIMESTAMP_MONOTONIC, SOL_SOCKET, mp); if (*mp == NULL) { return NULL; } } if ((inp->inp_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) { uint64_t time; time = mach_continuous_time(); mp = sbcreatecontrol_mbuf((caddr_t)&time, sizeof(time), SCM_TIMESTAMP_CONTINUOUS, SOL_SOCKET, mp); if (*mp == NULL) { return NULL; } } if ((inp->inp_socket->so_flags & SOF_RECV_TRAFFIC_CLASS) != 0) { int tc = m_get_traffic_class(m); mp = sbcreatecontrol_mbuf((caddr_t)&tc, sizeof(tc), SO_TRAFFIC_CLASS, SOL_SOCKET, mp); if (*mp == NULL) { return NULL; } } #define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { if (v4only != NULL) { *v4only = 1; } // Send ECN flags for v4-mapped addresses if ((inp->inp_flags & IN6P_TCLASS) != 0) { struct ip *ip_header = mtod(m, struct ip *); int tclass = (int)(ip_header->ip_tos); mp = sbcreatecontrol_mbuf((caddr_t)&tclass, sizeof(tclass), IPV6_TCLASS, IPPROTO_IPV6, mp); if (*mp == NULL) { return NULL; } } // Send IN6P_PKTINFO for v4-mapped address if ((inp->inp_flags & IN6P_PKTINFO) != 0 #if CONTENT_FILTER /* Content Filter needs to see local address */ || (inp->inp_socket->so_cfil_db != NULL) #endif ) { struct in6_pktinfo pi6 = { .ipi6_addr = IN6ADDR_V4MAPPED_INIT, .ipi6_ifindex = (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0, }; struct ip *ip_header = mtod(m, struct ip *); bcopy(&ip_header->ip_dst, &pi6.ipi6_addr.s6_addr32[3], sizeof(struct in_addr)); mp = sbcreatecontrol_mbuf((caddr_t)&pi6, sizeof(struct in6_pktinfo), IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, mp); if (*mp == NULL) { return NULL; } } return mp; } /* RFC 2292 sec. 5 */ if ((inp->inp_flags & IN6P_PKTINFO) != 0 #if CONTENT_FILTER /* Content Filter needs to see local address */ || (inp->inp_socket->so_cfil_db != NULL) #endif ) { 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->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; mp = sbcreatecontrol_mbuf((caddr_t)&pi6, sizeof(struct in6_pktinfo), IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6, mp); if (*mp == NULL) { return NULL; } } if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { int hlim = ip6->ip6_hlim & 0xff; mp = sbcreatecontrol_mbuf((caddr_t)&hlim, sizeof(int), IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6, mp); if (*mp == NULL) { return NULL; } } if (v4only != NULL) { *v4only = 0; } return mp; } int ip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) { struct mbuf **np; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); int v4only = 0; *mp = NULL; np = ip6_savecontrol_v4(in6p, m, mp, &v4only); if (np == NULL) { goto no_mbufs; } mp = np; if (v4only) { return 0; } if ((in6p->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_mbuf((caddr_t)&tclass, sizeof(tclass), IPV6_TCLASS, IPPROTO_IPV6, mp); if (*mp == NULL) { goto no_mbufs; } } /* * 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 RFC 2292 section 6 (or RFC 3542 section 8). */ if ((in6p->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 is assured through the * IPv6 input processing. */ ip6 = mtod(m, struct ip6_hdr *); if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { struct ip6_hbh *hbh; int hbhlen = 0; hbh = (struct ip6_hbh *)(ip6 + 1); hbhlen = (hbh->ip6h_len + 1) << 3; /* * XXX: We copy the whole header even if a * jumbo payload option is included, the option which * is to be removed before returning according to * RFC2292. * Note: this constraint is removed in RFC3542 */ mp = sbcreatecontrol_mbuf((caddr_t)hbh, hbhlen, IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), IPPROTO_IPV6, mp); if (*mp == NULL) { goto no_mbufs; } } } if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { int nxt = ip6->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. */ while (1) { /* is explicit loop prevention necessary? */ struct ip6_ext *ip6e = NULL; int elen; /* * 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; } if (off + sizeof(*ip6e) > m->m_len) { goto loopend; } ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); if (nxt == IPPROTO_AH) { elen = (ip6e->ip6e_len + 2) << 2; } else { elen = (ip6e->ip6e_len + 1) << 3; } if (off + elen > m->m_len) { goto loopend; } switch (nxt) { case IPPROTO_DSTOPTS: if (!(in6p->inp_flags & IN6P_DSTOPTS)) { break; } mp = sbcreatecontrol_mbuf((caddr_t)ip6e, elen, IS2292(in6p, IPV6_2292DSTOPTS, IPV6_DSTOPTS), IPPROTO_IPV6, mp); if (*mp == NULL) { goto no_mbufs; } break; case IPPROTO_ROUTING: if (!(in6p->inp_flags & IN6P_RTHDR)) { break; } mp = sbcreatecontrol_mbuf((caddr_t)ip6e, elen, IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), IPPROTO_IPV6, mp); if (*mp == NULL) { goto no_mbufs; } 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). */ goto loopend; } /* proceed with the next header. */ off += elen; nxt = ip6e->ip6e_nxt; ip6e = NULL; } loopend: ; } return 0; no_mbufs: ip6stat.ip6s_pktdropcntrl++; /* XXX increment a stat to show the failure */ return ENOBUFS; } #undef IS2292 void ip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) { struct socket *so; struct mbuf *m_mtu; struct ip6_mtuinfo mtuctl; so = in6p->inp_socket; if ((in6p->inp_flags & IN6P_MTU) == 0) { return; } if (mtu == NULL) { return; } #ifdef DIAGNOSTIC if (so == NULL) { /* I believe this is impossible */ panic("ip6_notify_pmtu: socket is NULL"); /* NOTREACHED */ } #endif if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && (so->so_proto == NULL || so->so_proto->pr_protocol == IPPROTO_TCP)) { return; } if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &dst->sin6_addr)) { return; } bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ mtuctl.ip6m_mtu = *mtu; mtuctl.ip6m_addr = *dst; if (sa6_recoverscope(&mtuctl.ip6m_addr, TRUE)) { return; } if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) { return; } if (sbappendaddr(&so->so_rcv, SA(dst), NULL, m_mtu, NULL) == 0) { return; } sorwakeup(so); } /* * 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. */ char * ip6_get_prevhdr(struct mbuf *m, int off) { struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); if (off == sizeof(struct ip6_hdr)) { return (char *)&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, caddr_t) + 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 (char *)&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 */ VERIFY(m != NULL); if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) { return -1; } switch (proto) { case IPPROTO_IPV6: if (m->m_pkthdr.len < off + sizeof(ip6)) { return -1; } m_copydata(m, off, sizeof(ip6), (caddr_t)&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), (caddr_t)&fh); /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ if (fh.ip6f_offlg & IP6F_OFF_MASK) { 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), (caddr_t)&ip6e); if (nxtp) { *nxtp = ip6e.ip6e_nxt; } off += (ip6e.ip6e_len + 2) << 2; 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), (caddr_t)&ip6e); if (nxtp) { *nxtp = ip6e.ip6e_nxt; } off += (ip6e.ip6e_len + 1) << 3; 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; } while (1) { 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; } } boolean_t ip6_pkt_has_ulp(struct mbuf *m) { int off = 0, nxt = IPPROTO_NONE; off = ip6_lasthdr(m, 0, IPPROTO_IPV6, &nxt); if (off < 0 || m->m_pkthdr.len < off) { return FALSE; } switch (nxt) { case IPPROTO_TCP: if (off + sizeof(struct tcphdr) > m->m_pkthdr.len) { return FALSE; } break; case IPPROTO_UDP: if (off + sizeof(struct udphdr) > m->m_pkthdr.len) { return FALSE; } break; case IPPROTO_ICMPV6: if (off + sizeof(uint32_t) > m->m_pkthdr.len) { return FALSE; } break; case IPPROTO_NONE: return TRUE; case IPPROTO_ESP: return TRUE; case IPPROTO_IPCOMP: return TRUE; default: return FALSE; } return TRUE; } struct ip6aux * ip6_addaux(struct mbuf *m) { struct m_tag *tag; /* Check if one is already allocated */ tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6, NULL); if (tag == NULL) { /* Allocate a tag */ tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6, sizeof(struct ip6aux), M_DONTWAIT, m); /* Attach it to the mbuf */ if (tag) { m_tag_prepend(m, tag); } } return tag ? (struct ip6aux *)(tag + 1) : NULL; } struct ip6aux * ip6_findaux(struct mbuf *m) { struct m_tag *tag; tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6, NULL); return tag ? (struct ip6aux *)(tag + 1) : NULL; } void ip6_delaux(struct mbuf *m) { struct m_tag *tag; tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_INET6, NULL); if (tag) { m_tag_delete(m, tag); } } /* * Drain callback */ void ip6_drain(void) { frag6_drain(); /* fragments */ in6_rtqdrain(); /* protocol cloned routes */ nd6_drain(NULL); /* cloned routes: ND6 */ } /* * 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 }; static int sysctl_reset_ip6_input_stats SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error, i; i = ip6_input_measure; error = sysctl_handle_int(oidp, &i, 0, req); if (error || req->newptr == USER_ADDR_NULL) { goto done; } /* impose bounds */ if (i < 0 || i > 1) { error = EINVAL; goto done; } if (ip6_input_measure != i && i == 1) { net_perf_initialize(&net_perf, ip6_input_measure_bins); } ip6_input_measure = i; done: return error; } static int sysctl_ip6_input_measure_bins SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error; uint64_t i; i = ip6_input_measure_bins; error = sysctl_handle_quad(oidp, &i, 0, req); if (error || req->newptr == USER_ADDR_NULL) { goto done; } /* validate data */ if (!net_perf_validate_bins(i)) { error = EINVAL; goto done; } ip6_input_measure_bins = i; done: return error; } static int sysctl_ip6_input_getperf SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg1, arg2) if (req->oldptr == USER_ADDR_NULL) { req->oldlen = (size_t)sizeof(struct net_perf); } return SYSCTL_OUT(req, &net_perf, MIN(sizeof(net_perf), req->oldlen)); } /* * Initialize IPv6 source address hash table. */ static void in6_ifaddrhashtbl_init(void) { int i, k, p; if (in6_ifaddrhashtbl != NULL) { return; } PE_parse_boot_argn("ina6ddr_nhash", &in6addr_nhash, sizeof(in6addr_nhash)); if (in6addr_nhash == 0) { in6addr_nhash = IN6ADDR_NHASH; } MALLOC(in6_ifaddrhashtbl, struct in6_ifaddrhashhead *, in6addr_nhash * sizeof(*in6_ifaddrhashtbl), M_IFADDR, M_WAITOK | M_ZERO); if (in6_ifaddrhashtbl == NULL) { panic("in6_ifaddrhashtbl allocation failed"); } /* * Generate the next largest prime greater than in6addr_nhash. */ k = (in6addr_nhash % 2 == 0) ? in6addr_nhash + 1 : in6addr_nhash + 2; for (;;) { p = 1; for (i = 3; i * i <= k; i += 2) { if (k % i == 0) { p = 0; } } if (p == 1) { break; } k += 2; } in6addr_hashp = k; } static int sysctl_ip6_checkinterface SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error, i; i = ip6_checkinterface; error = sysctl_handle_int(oidp, &i, 0, req); if (error || req->newptr == USER_ADDR_NULL) { return error; } switch (i) { case IP6_CHECKINTERFACE_WEAK_ES: case IP6_CHECKINTERFACE_HYBRID_ES: case IP6_CHECKINTERFACE_STRONG_ES: if (ip6_checkinterface != i) { ip6_checkinterface = i; os_log(OS_LOG_DEFAULT, "%s: ip6_checkinterface is now %d\n", __func__, ip6_checkinterface); } break; default: error = EINVAL; break; } return error; } |