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4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 | /* * Copyright (c) 2000-2020 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) 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 */ /* * NOTICE: This file was modified by SPARTA, Inc. in 2007 to introduce * support for mandatory and extensible security protections. This notice * is included in support of clause 2.2 (b) of the Apple Public License, * Version 2.0. */ #define _IP_VHL #include <sys/param.h> #include <sys/systm.h> #include <sys/mbuf.h> #include <sys/malloc.h> #include <sys/domain.h> #include <sys/protosw.h> #include <sys/socket.h> #include <sys/time.h> #include <sys/kernel.h> #include <sys/syslog.h> #include <sys/sysctl.h> #include <sys/mcache.h> #include <sys/socketvar.h> #include <sys/kdebug.h> #include <mach/mach_time.h> #include <mach/sdt.h> #include <machine/endian.h> #include <dev/random/randomdev.h> #include <kern/queue.h> #include <kern/locks.h> #include <libkern/OSAtomic.h> #include <pexpert/pexpert.h> #include <net/if.h> #include <net/if_var.h> #include <net/if_dl.h> #include <net/route.h> #include <net/kpi_protocol.h> #include <net/ntstat.h> #include <net/dlil.h> #include <net/classq/classq.h> #include <net/net_perf.h> #include <net/init.h> #if PF #include <net/pfvar.h> #endif /* PF */ #include <net/if_ports_used.h> #include <netinet/in.h> #include <netinet/in_systm.h> #include <netinet/in_var.h> #include <netinet/in_arp.h> #include <netinet/ip.h> #include <netinet/in_pcb.h> #include <netinet/ip_var.h> #include <netinet/ip_icmp.h> #include <netinet/kpi_ipfilter_var.h> #include <netinet/udp.h> #include <netinet/udp_var.h> #include <netinet/bootp.h> #if DUMMYNET #include <netinet/ip_dummynet.h> #endif /* DUMMYNET */ #if IPSEC #include <netinet6/ipsec.h> #include <netkey/key.h> #endif /* IPSEC */ #include <os/log.h> #define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 0) #define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 2) #define DBG_FNC_IP_INPUT NETDBG_CODE(DBG_NETIP, (2 << 8)) #if IPSEC extern int ipsec_bypass; #endif /* IPSEC */ MBUFQ_HEAD(fq_head); static int frag_timeout_run; /* frag timer is scheduled to run */ static void frag_timeout(void *); static void frag_sched_timeout(void); static struct ipq *ipq_alloc(int); static void ipq_free(struct ipq *); static void ipq_updateparams(void); static void ip_input_second_pass(struct mbuf *, struct ifnet *, int, int, struct ip_fw_in_args *); static LCK_GRP_DECLARE(ipqlock_grp, "ipqlock"); static LCK_MTX_DECLARE(ipqlock, &ipqlock_grp); /* Packet reassembly stuff */ #define IPREASS_NHASH_LOG2 6 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2) #define IPREASS_HMASK (IPREASS_NHASH - 1) #define IPREASS_HASH(x, y) \ (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK) /* IP fragment reassembly queues (protected by ipqlock) */ static TAILQ_HEAD(ipqhead, ipq) ipq[IPREASS_NHASH]; /* ip reassembly queues */ static int maxnipq; /* max packets in reass queues */ static u_int32_t maxfragsperpacket; /* max frags/packet in reass queues */ static u_int32_t nipq; /* # of packets in reass queues */ static u_int32_t ipq_limit; /* ipq allocation limit */ static u_int32_t ipq_count; /* current # of allocated ipq's */ static int sysctl_ipforwarding SYSCTL_HANDLER_ARGS; static int sysctl_maxnipq SYSCTL_HANDLER_ARGS; static int sysctl_maxfragsperpacket SYSCTL_HANDLER_ARGS; #if (DEBUG || DEVELOPMENT) static int sysctl_reset_ip_input_stats SYSCTL_HANDLER_ARGS; static int sysctl_ip_input_measure_bins SYSCTL_HANDLER_ARGS; static int sysctl_ip_input_getperf SYSCTL_HANDLER_ARGS; #endif /* (DEBUG || DEVELOPMENT) */ int ipforwarding = 0; SYSCTL_PROC(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ipforwarding, 0, sysctl_ipforwarding, "I", "Enable IP forwarding between interfaces"); static int ipsendredirects = 1; /* XXX */ SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW | CTLFLAG_LOCKED, &ipsendredirects, 0, "Enable sending IP redirects"); int ip_defttl = IPDEFTTL; SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_defttl, 0, "Maximum TTL on IP packets"); static int ip_dosourceroute = 0; SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_dosourceroute, 0, "Enable forwarding source routed IP packets"); static int ip_acceptsourceroute = 0; SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_acceptsourceroute, 0, "Enable accepting source routed IP packets"); static int ip_sendsourcequench = 0; SYSCTL_INT(_net_inet_ip, OID_AUTO, sendsourcequench, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_sendsourcequench, 0, "Enable the transmission of source quench packets"); SYSCTL_PROC(_net_inet_ip, OID_AUTO, maxfragpackets, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &maxnipq, 0, sysctl_maxnipq, "I", "Maximum number of IPv4 fragment reassembly queue entries"); SYSCTL_UINT(_net_inet_ip, OID_AUTO, fragpackets, CTLFLAG_RD | CTLFLAG_LOCKED, &nipq, 0, "Current number of IPv4 fragment reassembly queue entries"); SYSCTL_PROC(_net_inet_ip, OID_AUTO, maxfragsperpacket, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &maxfragsperpacket, 0, sysctl_maxfragsperpacket, "I", "Maximum number of IPv4 fragments allowed per packet"); static uint32_t ip_adj_clear_hwcksum = 0; SYSCTL_UINT(_net_inet_ip, OID_AUTO, adj_clear_hwcksum, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_adj_clear_hwcksum, 0, "Invalidate hwcksum info when adjusting length"); static uint32_t ip_adj_partial_sum = 1; SYSCTL_UINT(_net_inet_ip, OID_AUTO, adj_partial_sum, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_adj_partial_sum, 0, "Perform partial sum adjustment of trailing bytes at IP layer"); /* * ip_checkinterface controls the receive side of the models for multihoming * that are discussed in RFC 1122. * * ip_checkinterface values are: * IP_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. * * IP_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. * * IP_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 IP_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. * * XXX - ip_checkinterface currently must be set to IP_CHECKINTERFACE_WEAK_ES if you use ipnat * to translate the destination address to another local interface. * * XXX - ip_checkinterface must be set to IP_CHECKINTERFACE_WEAK_ES if you add IP aliases * to the loopback interface instead of the interface where the * packets for those addresses are received. */ #define IP_CHECKINTERFACE_WEAK_ES 0 #define IP_CHECKINTERFACE_HYBRID_ES 1 #define IP_CHECKINTERFACE_STRONG_ES 2 static int ip_checkinterface = IP_CHECKINTERFACE_HYBRID_ES; static int sysctl_ip_checkinterface SYSCTL_HANDLER_ARGS; SYSCTL_PROC(_net_inet_ip, OID_AUTO, check_interface, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, 0, 0, sysctl_ip_checkinterface, "I", "Verify packet arrives on correct interface"); #if (DEBUG || DEVELOPMENT) #define IP_CHECK_IF_DEBUG 1 #else #define IP_CHECK_IF_DEBUG 0 #endif /* (DEBUG || DEVELOPMENT) */ static int ip_checkinterface_debug = IP_CHECK_IF_DEBUG; SYSCTL_INT(_net_inet_ip, OID_AUTO, checkinterface_debug, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_checkinterface_debug, IP_CHECK_IF_DEBUG, ""); static int ip_chaining = 1; SYSCTL_INT(_net_inet_ip, OID_AUTO, rx_chaining, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_chaining, 1, "Do receive side ip address based chaining"); static int ip_chainsz = 6; SYSCTL_INT(_net_inet_ip, OID_AUTO, rx_chainsz, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_chainsz, 1, "IP receive side max chaining"); #if (DEBUG || DEVELOPMENT) static int ip_input_measure = 0; SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ip_input_measure, 0, sysctl_reset_ip_input_stats, "I", "Do time measurement"); static uint64_t ip_input_measure_bins = 0; SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf_bins, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &ip_input_measure_bins, 0, sysctl_ip_input_measure_bins, "I", "bins for chaining performance data histogram"); static net_perf_t net_perf; SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf_data, CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, sysctl_ip_input_getperf, "S,net_perf", "IP input performance data (struct net_perf, net/net_perf.h)"); #endif /* (DEBUG || DEVELOPMENT) */ #if DIAGNOSTIC static int ipprintfs = 0; #endif struct protosw *ip_protox[IPPROTO_MAX]; static LCK_GRP_DECLARE(in_ifaddr_rwlock_grp, "in_ifaddr_rwlock"); LCK_RW_DECLARE(in_ifaddr_rwlock, &in_ifaddr_rwlock_grp); /* Protected by in_ifaddr_rwlock */ struct in_ifaddrhead in_ifaddrhead; /* first inet address */ struct in_ifaddrhashhead *in_ifaddrhashtbl; /* inet addr hash table */ #define INADDR_NHASH 61 static u_int32_t inaddr_nhash; /* hash table size */ static u_int32_t inaddr_hashp; /* next largest prime */ static int ip_getstat SYSCTL_HANDLER_ARGS; struct ipstat ipstat; SYSCTL_PROC(_net_inet_ip, IPCTL_STATS, stats, CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, ip_getstat, "S,ipstat", "IP statistics (struct ipstat, netinet/ip_var.h)"); #if IPCTL_DEFMTU SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_mtu, 0, "Default MTU"); #endif /* IPCTL_DEFMTU */ #if IPSTEALTH static int ipstealth = 0; SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW | CTLFLAG_LOCKED, &ipstealth, 0, ""); #endif /* IPSTEALTH */ #if DUMMYNET ip_dn_io_t *ip_dn_io_ptr; #endif /* DUMMYNET */ SYSCTL_NODE(_net_inet_ip, OID_AUTO, linklocal, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "link local"); struct ip_linklocal_stat ip_linklocal_stat; SYSCTL_STRUCT(_net_inet_ip_linklocal, OID_AUTO, stat, CTLFLAG_RD | CTLFLAG_LOCKED, &ip_linklocal_stat, ip_linklocal_stat, "Number of link local packets with TTL less than 255"); SYSCTL_NODE(_net_inet_ip_linklocal, OID_AUTO, in, CTLFLAG_RW | CTLFLAG_LOCKED, 0, "link local input"); int ip_linklocal_in_allowbadttl = 1; SYSCTL_INT(_net_inet_ip_linklocal_in, OID_AUTO, allowbadttl, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_linklocal_in_allowbadttl, 0, "Allow incoming link local packets with TTL less than 255"); /* * We need 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. */ static int ip_nhops = 0; static struct ip_srcrt { struct in_addr dst; /* final destination */ char nop; /* one NOP to align */ char srcopt[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN and OFFSET */ struct in_addr route[MAX_IPOPTLEN / sizeof(struct in_addr)]; } ip_srcrt; static void in_ifaddrhashtbl_init(void); static void save_rte(u_char *, struct in_addr); static int ip_dooptions(struct mbuf *, int, struct sockaddr_in *); static void ip_forward(struct mbuf *, int, struct sockaddr_in *); static void frag_freef(struct ipqhead *, struct ipq *); static struct mbuf *ip_reass(struct mbuf *); static void ip_fwd_route_copyout(struct ifnet *, struct route *); static void ip_fwd_route_copyin(struct ifnet *, struct route *); static inline u_short ip_cksum(struct mbuf *, int); /* * 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. */ #if defined(__i386__) || defined(__x86_64__) #define IP_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { } while (0) #else /* !__i386__ && !__x86_64__ */ #define IP_HDR_ALIGNMENT_FIXUP(_m, _ifp, _action) do { \ if (!IP_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) { \ atomic_add_32(&ipstat.ips_toosmall, 1); \ m_freem(_m); \ (_m) = NULL; \ _action; \ } else { \ VERIFY(_n != (_m)); \ (_m) = _n; \ } \ } \ } while (0) #endif /* !__i386__ && !__x86_64__ */ typedef enum ip_check_if_result { IP_CHECK_IF_NONE = 0, IP_CHECK_IF_OURS = 1, IP_CHECK_IF_DROP = 2, IP_CHECK_IF_FORWARD = 3 } ip_check_if_result_t; static ip_check_if_result_t ip_input_check_interface(struct mbuf **, struct ip *, struct ifnet *); /* * GRE input handler function, settable via ip_gre_register_input() for PPTP. */ static gre_input_func_t gre_input_func; static void ip_init_delayed(void) { struct ifreq ifr; int error; struct sockaddr_in *sin; bzero(&ifr, sizeof(ifr)); strlcpy(ifr.ifr_name, "lo0", sizeof(ifr.ifr_name)); sin = (struct sockaddr_in *)(void *)&ifr.ifr_addr; sin->sin_len = sizeof(struct sockaddr_in); sin->sin_family = AF_INET; sin->sin_addr.s_addr = htonl(INADDR_LOOPBACK); error = in_control(NULL, SIOCSIFADDR, (caddr_t)&ifr, lo_ifp, kernproc); if (error) { printf("%s: failed to initialise lo0's address, error=%d\n", __func__, error); } } /* * IP initialization: fill in IP protocol switch table. * All protocols not implemented in kernel go to raw IP protocol handler. */ void ip_init(struct protosw *pp, struct domain *dp) { static int ip_initialized = 0; struct protosw *pr; struct timeval tv; int i; domain_proto_mtx_lock_assert_held(); VERIFY((pp->pr_flags & (PR_INITIALIZED | PR_ATTACHED)) == PR_ATTACHED); /* ipq_alloc() uses mbufs for IP fragment queue structures */ _CASSERT(sizeof(struct ipq) <= _MLEN); /* * Some ioctls (e.g. SIOCAIFADDR) use ifaliasreq struct, which is * interchangeable with in_aliasreq; they must have the same size. */ _CASSERT(sizeof(struct ifaliasreq) == sizeof(struct in_aliasreq)); if (ip_initialized) { return; } ip_initialized = 1; in_ifaddr_init(); TAILQ_INIT(&in_ifaddrhead); in_ifaddrhashtbl_init(); ip_moptions_init(); pr = pffindproto_locked(PF_INET, IPPROTO_RAW, SOCK_RAW); if (pr == NULL) { panic("%s: Unable to find [PF_INET,IPPROTO_RAW,SOCK_RAW]", __func__); /* NOTREACHED */ } /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */ for (i = 0; i < IPPROTO_MAX; i++) { ip_protox[i] = pr; } /* * Cycle through IP protocols and put them into the appropriate place * in ip_protox[], skipping protocols IPPROTO_{IP,RAW}. */ VERIFY(dp == inetdomain && dp->dom_family == PF_INET); 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) { ip_protox[pr->pr_protocol] = pr; } } } lck_mtx_lock(&ipqlock); /* Initialize IP reassembly queue. */ for (i = 0; i < IPREASS_NHASH; i++) { TAILQ_INIT(&ipq[i]); } maxnipq = nmbclusters / 32; maxfragsperpacket = 128; /* enough for 64k in 512 byte fragments */ ipq_updateparams(); lck_mtx_unlock(&ipqlock); getmicrotime(&tv); ip_id = (u_short)(RandomULong() ^ tv.tv_usec); PE_parse_boot_argn("ip_checkinterface", &i, sizeof(i)); switch (i) { case IP_CHECKINTERFACE_WEAK_ES: case IP_CHECKINTERFACE_HYBRID_ES: case IP_CHECKINTERFACE_STRONG_ES: ip_checkinterface = i; break; default: break; } arp_init(); net_init_add(ip_init_delayed); } /* * Initialize IPv4 source address hash table. */ static void in_ifaddrhashtbl_init(void) { int i, k, p; if (in_ifaddrhashtbl != NULL) { return; } PE_parse_boot_argn("inaddr_nhash", &inaddr_nhash, sizeof(inaddr_nhash)); if (inaddr_nhash == 0) { inaddr_nhash = INADDR_NHASH; } MALLOC(in_ifaddrhashtbl, struct in_ifaddrhashhead *, inaddr_nhash * sizeof(*in_ifaddrhashtbl), M_IFADDR, M_WAITOK | M_ZERO); if (in_ifaddrhashtbl == NULL) { panic("in_ifaddrhashtbl_init allocation failed"); } /* * Generate the next largest prime greater than inaddr_nhash. */ k = (inaddr_nhash % 2 == 0) ? inaddr_nhash + 1 : inaddr_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; } inaddr_hashp = k; } u_int32_t inaddr_hashval(u_int32_t key) { /* * The hash index is the computed prime times the key modulo * the hash size, as documented in "Introduction to Algorithms" * (Cormen, Leiserson, Rivest). */ if (inaddr_nhash > 1) { return (key * inaddr_hashp) % inaddr_nhash; } else { return 0; } } __private_extern__ void ip_proto_dispatch_in(struct mbuf *m, int hlen, u_int8_t proto, ipfilter_t inject_ipfref) { struct ipfilter *filter; int seen = (inject_ipfref == NULL); int changed_header = 0; struct ip *ip; void (*pr_input)(struct mbuf *, int len); if (!TAILQ_EMPTY(&ipv4_filters)) { ipf_ref(); TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) { if (seen == 0) { if ((struct ipfilter *)inject_ipfref == filter) { seen = 1; } } else if (filter->ipf_filter.ipf_input) { errno_t result; if (changed_header == 0) { /* * Perform IP header alignment fixup, * if needed, before passing packet * into filter(s). */ IP_HDR_ALIGNMENT_FIXUP(m, m->m_pkthdr.rcvif, ipf_unref()); /* ipf_unref() already called */ if (m == NULL) { return; } changed_header = 1; ip = mtod(m, struct ip *); ip->ip_len = htons(ip->ip_len + (uint16_t)hlen); ip->ip_off = htons(ip->ip_off); ip->ip_sum = 0; ip->ip_sum = ip_cksum_hdr_in(m, hlen); } result = filter->ipf_filter.ipf_input( filter->ipf_filter.cookie, (mbuf_t *)&m, hlen, proto); if (result == EJUSTRETURN) { ipf_unref(); return; } if (result != 0) { ipf_unref(); m_freem(m); return; } } } ipf_unref(); } /* Perform IP header alignment fixup (post-filters), if needed */ IP_HDR_ALIGNMENT_FIXUP(m, m->m_pkthdr.rcvif, return ); ip = mtod(m, struct ip *); if (changed_header) { ip->ip_len = ntohs(ip->ip_len) - (u_short)hlen; ip->ip_off = ntohs(ip->ip_off); } /* * If there isn't a specific lock for the protocol * we're about to call, use the generic lock for AF_INET. * otherwise let the protocol deal with its own locking */ if ((pr_input = ip_protox[ip->ip_p]->pr_input) == NULL) { m_freem(m); } else if (!(ip_protox[ip->ip_p]->pr_flags & PR_PROTOLOCK)) { lck_mtx_lock(inet_domain_mutex); pr_input(m, hlen); lck_mtx_unlock(inet_domain_mutex); } else { pr_input(m, hlen); } } struct pktchain_elm { struct mbuf *pkte_head; struct mbuf *pkte_tail; struct in_addr pkte_saddr; struct in_addr pkte_daddr; uint16_t pkte_npkts; uint16_t pkte_proto; uint32_t pkte_nbytes; }; typedef struct pktchain_elm pktchain_elm_t; /* Store upto PKTTBL_SZ unique flows on the stack */ #define PKTTBL_SZ 7 static struct mbuf * ip_chain_insert(struct mbuf *packet, pktchain_elm_t *tbl) { struct ip* ip; int pkttbl_idx = 0; ip = mtod(packet, struct ip*); /* reusing the hash function from inaddr_hashval */ pkttbl_idx = inaddr_hashval(ntohl(ip->ip_src.s_addr)) % PKTTBL_SZ; if (tbl[pkttbl_idx].pkte_head == NULL) { tbl[pkttbl_idx].pkte_head = packet; tbl[pkttbl_idx].pkte_saddr.s_addr = ip->ip_src.s_addr; tbl[pkttbl_idx].pkte_daddr.s_addr = ip->ip_dst.s_addr; tbl[pkttbl_idx].pkte_proto = ip->ip_p; } else { if ((ip->ip_dst.s_addr == tbl[pkttbl_idx].pkte_daddr.s_addr) && (ip->ip_src.s_addr == tbl[pkttbl_idx].pkte_saddr.s_addr) && (ip->ip_p == tbl[pkttbl_idx].pkte_proto)) { } else { return packet; } } if (tbl[pkttbl_idx].pkte_tail != NULL) { mbuf_setnextpkt(tbl[pkttbl_idx].pkte_tail, packet); } tbl[pkttbl_idx].pkte_tail = packet; tbl[pkttbl_idx].pkte_npkts += 1; tbl[pkttbl_idx].pkte_nbytes += packet->m_pkthdr.len; return NULL; } /* args is a dummy variable here for backward compatibility */ static void ip_input_second_pass_loop_tbl(pktchain_elm_t *tbl, struct ip_fw_in_args *args) { int i = 0; for (i = 0; i < PKTTBL_SZ; i++) { if (tbl[i].pkte_head != NULL) { struct mbuf *m = tbl[i].pkte_head; ip_input_second_pass(m, m->m_pkthdr.rcvif, tbl[i].pkte_npkts, tbl[i].pkte_nbytes, args); if (tbl[i].pkte_npkts > 2) { ipstat.ips_rxc_chainsz_gt2++; } if (tbl[i].pkte_npkts > 4) { ipstat.ips_rxc_chainsz_gt4++; } #if (DEBUG || DEVELOPMENT) if (ip_input_measure) { net_perf_histogram(&net_perf, tbl[i].pkte_npkts); } #endif /* (DEBUG || DEVELOPMENT) */ tbl[i].pkte_head = tbl[i].pkte_tail = NULL; tbl[i].pkte_npkts = 0; tbl[i].pkte_nbytes = 0; /* no need to initialize address and protocol in tbl */ } } } static void ip_input_cpout_args(struct ip_fw_in_args *args, struct ip_fw_args *args1, boolean_t *done_init) { if (*done_init == FALSE) { bzero(args1, sizeof(struct ip_fw_args)); *done_init = TRUE; } args1->fwa_pf_rule = args->fwai_pf_rule; } static void ip_input_cpin_args(struct ip_fw_args *args1, struct ip_fw_in_args *args) { args->fwai_pf_rule = args1->fwa_pf_rule; } typedef enum { IPINPUT_DOCHAIN = 0, IPINPUT_DONTCHAIN, IPINPUT_FREED, IPINPUT_DONE } ipinput_chain_ret_t; static void ip_input_update_nstat(struct ifnet *ifp, struct in_addr src_ip, u_int32_t packets, u_int32_t bytes) { if (nstat_collect) { struct rtentry *rt = ifnet_cached_rtlookup_inet(ifp, src_ip); if (rt != NULL) { nstat_route_rx(rt, packets, bytes, 0); rtfree(rt); } } } static void ip_input_dispatch_chain(struct mbuf *m) { struct mbuf *tmp_mbuf = m; struct mbuf *nxt_mbuf = NULL; struct ip *ip = NULL; unsigned int hlen; ip = mtod(tmp_mbuf, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; while (tmp_mbuf != NULL) { nxt_mbuf = mbuf_nextpkt(tmp_mbuf); mbuf_setnextpkt(tmp_mbuf, NULL); ip_proto_dispatch_in(tmp_mbuf, hlen, ip->ip_p, 0); tmp_mbuf = nxt_mbuf; if (tmp_mbuf) { ip = mtod(tmp_mbuf, struct ip *); /* first mbuf of chain already has adjusted ip_len */ hlen = IP_VHL_HL(ip->ip_vhl) << 2; ip->ip_len -= hlen; } } } static void ip_input_setdst_chain(struct mbuf *m, uint16_t ifindex, struct in_ifaddr *ia) { struct mbuf *tmp_mbuf = m; while (tmp_mbuf != NULL) { ip_setdstifaddr_info(tmp_mbuf, ifindex, ia); tmp_mbuf = mbuf_nextpkt(tmp_mbuf); } } static void ip_input_adjust(struct mbuf *m, struct ip *ip, struct ifnet *inifp) { boolean_t adjust = TRUE; ASSERT(m_pktlen(m) > ip->ip_len); /* * Invalidate hardware checksum info if ip_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 (ip_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; ipstat.ips_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 (ip_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, (ip->ip_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 ((ip->ip_off & (IP_MF | IP_OFFMASK)) == 0 && (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_UDP)) { adjust = FALSE; } else { m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID; m->m_pkthdr.csum_data = 0; ipstat.ips_adj_hwcsum_clr++; } } if (adjust) { ipstat.ips_adj++; if (m->m_len == m->m_pkthdr.len) { m->m_len = ip->ip_len; m->m_pkthdr.len = ip->ip_len; } else { m_adj(m, ip->ip_len - m->m_pkthdr.len); } } } /* * First pass does all essential packet validation and places on a per flow * queue for doing operations that have same outcome for all packets of a flow. */ static ipinput_chain_ret_t ip_input_first_pass(struct mbuf *m, struct ip_fw_in_args *args, struct mbuf **modm) { struct ip *ip; struct ifnet *inifp; unsigned int hlen; int retval = IPINPUT_DOCHAIN; int len = 0; struct in_addr src_ip; #if DUMMYNET struct m_tag *copy; struct m_tag *p; boolean_t delete = FALSE; struct ip_fw_args args1; boolean_t init = FALSE; #endif /* DUMMYNET */ ipfilter_t inject_filter_ref = NULL; /* Check if the mbuf is still valid after interface filter processing */ MBUF_INPUT_CHECK(m, m->m_pkthdr.rcvif); inifp = mbuf_pkthdr_rcvif(m); VERIFY(inifp != NULL); /* Perform IP header alignment fixup, if needed */ IP_HDR_ALIGNMENT_FIXUP(m, inifp, goto bad); m->m_pkthdr.pkt_flags &= ~PKTF_FORWARDED; #if DUMMYNET /* * Don't bother searching for tag(s) if there's none. */ if (SLIST_EMPTY(&m->m_pkthdr.tags)) { goto ipfw_tags_done; } /* Grab info from mtags prepended to the chain */ p = m_tag_first(m); while (p) { if (p->m_tag_id == KERNEL_MODULE_TAG_ID) { if (p->m_tag_type == KERNEL_TAG_TYPE_DUMMYNET) { struct dn_pkt_tag *dn_tag; dn_tag = (struct dn_pkt_tag *)(p + 1); args->fwai_pf_rule = dn_tag->dn_pf_rule; delete = TRUE; } if (delete) { copy = p; p = m_tag_next(m, p); m_tag_delete(m, copy); } else { p = m_tag_next(m, p); } } else { p = m_tag_next(m, p); } } #if DIAGNOSTIC if (m == NULL || !(m->m_flags & M_PKTHDR)) { panic("ip_input no HDR"); } #endif if (args->fwai_pf_rule) { /* dummynet already filtered us */ ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; inject_filter_ref = ipf_get_inject_filter(m); if (args->fwai_pf_rule) { goto check_with_pf; } } ipfw_tags_done: #endif /* DUMMYNET */ /* * No need to process packet twice if we've already seen it. */ if (!SLIST_EMPTY(&m->m_pkthdr.tags)) { inject_filter_ref = ipf_get_inject_filter(m); } if (inject_filter_ref != NULL) { ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL, struct ip *, ip, struct ifnet *, inifp, struct ip *, ip, struct ip6_hdr *, NULL); ip->ip_len = ntohs(ip->ip_len) - (u_short)hlen; ip->ip_off = ntohs(ip->ip_off); ip_proto_dispatch_in(m, hlen, ip->ip_p, inject_filter_ref); return IPINPUT_DONE; } if (__improbable(m->m_pkthdr.pkt_flags & PKTF_WAKE_PKT)) { if_ports_used_match_mbuf(inifp, PF_INET, m); } if (m->m_pkthdr.len < sizeof(struct ip)) { OSAddAtomic(1, &ipstat.ips_total); OSAddAtomic(1, &ipstat.ips_tooshort); m_freem(m); return IPINPUT_FREED; } if (m->m_len < sizeof(struct ip) && (m = m_pullup(m, sizeof(struct ip))) == NULL) { OSAddAtomic(1, &ipstat.ips_total); OSAddAtomic(1, &ipstat.ips_toosmall); return IPINPUT_FREED; } ip = mtod(m, struct ip *); *modm = m; KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr, ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); if (IP_VHL_V(ip->ip_vhl) != IPVERSION) { OSAddAtomic(1, &ipstat.ips_total); OSAddAtomic(1, &ipstat.ips_badvers); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); return IPINPUT_FREED; } hlen = IP_VHL_HL(ip->ip_vhl) << 2; if (hlen < sizeof(struct ip)) { OSAddAtomic(1, &ipstat.ips_total); OSAddAtomic(1, &ipstat.ips_badhlen); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); return IPINPUT_FREED; } if (hlen > m->m_len) { if ((m = m_pullup(m, hlen)) == NULL) { OSAddAtomic(1, &ipstat.ips_total); OSAddAtomic(1, &ipstat.ips_badhlen); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); return IPINPUT_FREED; } ip = mtod(m, struct ip *); *modm = m; } /* 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) { /* * Allow for the following exceptions: * * 1. If the packet was sent to loopback (i.e. rcvif * would have been set earlier at output time.) * * 2. If the packet was sent out on loopback from a local * source address which belongs to a non-loopback * interface (i.e. rcvif may not necessarily be a * loopback interface, hence the test for PKTF_LOOP.) * Unlike IPv6, there is no interface scope ID, and * therefore we don't care so much about PKTF_IFINFO. */ if (!(inifp->if_flags & IFF_LOOPBACK) && !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { OSAddAtomic(1, &ipstat.ips_total); OSAddAtomic(1, &ipstat.ips_badaddr); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); return IPINPUT_FREED; } } /* IPv4 Link-Local Addresses as defined in RFC3927 */ if ((IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)))) { ip_linklocal_stat.iplls_in_total++; if (ip->ip_ttl != MAXTTL) { OSAddAtomic(1, &ip_linklocal_stat.iplls_in_badttl); /* Silently drop link local traffic with bad TTL */ if (!ip_linklocal_in_allowbadttl) { OSAddAtomic(1, &ipstat.ips_total); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); return IPINPUT_FREED; } } } if (ip_cksum(m, hlen)) { OSAddAtomic(1, &ipstat.ips_total); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); return IPINPUT_FREED; } DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL, struct ip *, ip, struct ifnet *, inifp, struct ip *, ip, struct ip6_hdr *, NULL); /* * Convert fields to host representation. */ #if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_len); #endif if (ip->ip_len < hlen) { OSAddAtomic(1, &ipstat.ips_total); OSAddAtomic(1, &ipstat.ips_badlen); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); return IPINPUT_FREED; } #if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_off); #endif /* * Check that the amount of data in the buffers * is as at least 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 < ip->ip_len) { OSAddAtomic(1, &ipstat.ips_total); OSAddAtomic(1, &ipstat.ips_tooshort); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); return IPINPUT_FREED; } if (m->m_pkthdr.len > ip->ip_len) { ip_input_adjust(m, ip, inifp); } /* for netstat route statistics */ src_ip = ip->ip_src; len = m->m_pkthdr.len; #if DUMMYNET check_with_pf: #endif /* DUMMYNET */ #if PF /* Invoke inbound packet filter */ if (PF_IS_ENABLED) { int error; ip_input_cpout_args(args, &args1, &init); ip = mtod(m, struct ip *); src_ip = ip->ip_src; #if DUMMYNET error = pf_af_hook(inifp, NULL, &m, AF_INET, TRUE, &args1); #else error = pf_af_hook(inifp, NULL, &m, AF_INET, TRUE, NULL); #endif /* DUMMYNET */ if (error != 0 || m == NULL) { if (m != NULL) { panic("%s: unexpected packet %p", __func__, m); /* NOTREACHED */ } /* Already freed by callee */ ip_input_update_nstat(inifp, src_ip, 1, len); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); OSAddAtomic(1, &ipstat.ips_total); return IPINPUT_FREED; } ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; *modm = m; ip_input_cpin_args(&args1, args); } #endif /* PF */ #if IPSEC if (ipsec_bypass == 0 && ipsec_gethist(m, NULL)) { retval = IPINPUT_DONTCHAIN; /* XXX scope for chaining here? */ goto pass; } #endif #if IPSEC pass: #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). */ ip_nhops = 0; /* for source routed packets */ if (hlen > sizeof(struct ip) && ip_dooptions(m, 0, NULL)) { ip_input_update_nstat(inifp, src_ip, 1, len); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); OSAddAtomic(1, &ipstat.ips_total); return IPINPUT_FREED; } /* * Don't chain fragmented packets */ if (ip->ip_off & ~(IP_DF | IP_RF)) { return IPINPUT_DONTCHAIN; } /* Allow DHCP/BootP responses through */ if ((inifp->if_eflags & IFEF_AUTOCONFIGURING) && hlen == sizeof(struct ip) && ip->ip_p == IPPROTO_UDP) { struct udpiphdr *ui; if (m->m_len < sizeof(struct udpiphdr) && (m = m_pullup(m, sizeof(struct udpiphdr))) == NULL) { OSAddAtomic(1, &udpstat.udps_hdrops); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); OSAddAtomic(1, &ipstat.ips_total); return IPINPUT_FREED; } *modm = m; ui = mtod(m, struct udpiphdr *); if (ntohs(ui->ui_dport) == IPPORT_BOOTPC) { ip_setdstifaddr_info(m, inifp->if_index, NULL); return IPINPUT_DONTCHAIN; } } /* Avoid chaining raw sockets as ipsec checks occur later for them */ if (ip_protox[ip->ip_p]->pr_flags & PR_LASTHDR) { return IPINPUT_DONTCHAIN; } return retval; #if !defined(__i386__) && !defined(__x86_64__) bad: m_freem(m); return IPINPUT_FREED; #endif } /* * Because the call to m_pullup() may freem the mbuf, the function frees the mbuf packet * chain before it return IP_CHECK_IF_DROP */ static ip_check_if_result_t ip_input_check_interface(struct mbuf **mp, struct ip *ip, struct ifnet *inifp) { struct mbuf *m = *mp; struct in_ifaddr *ia = NULL; struct in_ifaddr *best_ia = NULL; struct ifnet *match_ifp = NULL; ip_check_if_result_t result = IP_CHECK_IF_NONE; /* * Host broadcast and all network broadcast addresses are always a match */ if (ip->ip_dst.s_addr == (u_int32_t)INADDR_BROADCAST || ip->ip_dst.s_addr == INADDR_ANY) { ip_input_setdst_chain(m, inifp->if_index, NULL); return IP_CHECK_IF_OURS; } /* * Check for a match in the hash bucket. */ lck_rw_lock_shared(&in_ifaddr_rwlock); TAILQ_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) { if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr) { best_ia = ia; match_ifp = best_ia->ia_ifp; if (ia->ia_ifp == inifp || (inifp->if_flags & IFF_LOOPBACK) || (m->m_pkthdr.pkt_flags & PKTF_LOOP)) { /* * A locally originated packet or packet from the loopback * interface is always an exact interface address match */ match_ifp = inifp; break; } /* * Continue the loop in case there's a exact match with another * interface */ } } if (best_ia != NULL) { if (match_ifp != inifp && ipforwarding == 0 && ((ip_checkinterface == IP_CHECKINTERFACE_HYBRID_ES && (match_ifp->if_family == IFNET_FAMILY_IPSEC || match_ifp->if_family == IFNET_FAMILY_UTUN)) || ip_checkinterface == IP_CHECKINTERFACE_STRONG_ES)) { /* * Drop when interface address check is strict and forwarding * is disabled */ result = IP_CHECK_IF_DROP; } else { result = IP_CHECK_IF_OURS; ip_input_setdst_chain(m, 0, best_ia); } } lck_rw_done(&in_ifaddr_rwlock); if (result == IP_CHECK_IF_NONE && (inifp->if_flags & IFF_BROADCAST)) { /* * Check for broadcast addresses. * * Only accept broadcast packets that arrive via the matching * interface. Reception of forwarded directed broadcasts would be * handled via ip_forward() and ether_frameout() with the loopback * into the stack for SIMPLEX interfaces handled by ether_frameout(). */ struct ifaddr *ifa; ifnet_lock_shared(inifp); TAILQ_FOREACH(ifa, &inifp->if_addrhead, ifa_link) { if (ifa->ifa_addr->sa_family != AF_INET) { continue; } ia = ifatoia(ifa); if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == ip->ip_dst.s_addr || ia->ia_netbroadcast.s_addr == ip->ip_dst.s_addr) { ip_input_setdst_chain(m, 0, ia); result = IP_CHECK_IF_OURS; match_ifp = inifp; break; } } ifnet_lock_done(inifp); } /* Allow DHCP/BootP responses through */ if (result == IP_CHECK_IF_NONE && (inifp->if_eflags & IFEF_AUTOCONFIGURING) && ip->ip_p == IPPROTO_UDP && (IP_VHL_HL(ip->ip_vhl) << 2) == sizeof(struct ip)) { struct udpiphdr *ui; if (m->m_len < sizeof(struct udpiphdr)) { if ((m = m_pullup(m, sizeof(struct udpiphdr))) == NULL) { OSAddAtomic(1, &udpstat.udps_hdrops); *mp = NULL; return IP_CHECK_IF_DROP; } /* * m_pullup can return a different mbuf */ *mp = m; ip = mtod(m, struct ip *); } ui = mtod(m, struct udpiphdr *); if (ntohs(ui->ui_dport) == IPPORT_BOOTPC) { ip_input_setdst_chain(m, inifp->if_index, NULL); result = IP_CHECK_IF_OURS; match_ifp = inifp; } } if (result == IP_CHECK_IF_NONE) { if (ipforwarding == 0) { result = IP_CHECK_IF_DROP; } else { result = IP_CHECK_IF_FORWARD; ip_input_setdst_chain(m, inifp->if_index, NULL); } } if (result == IP_CHECK_IF_OURS && match_ifp != inifp) { ipstat.ips_rcv_if_weak_match++; /* Logging is too noisy when forwarding is enabled */ if (ip_checkinterface_debug != 0 && ipforwarding == 0) { char src_str[MAX_IPv4_STR_LEN]; char dst_str[MAX_IPv4_STR_LEN]; inet_ntop(AF_INET, &ip->ip_src, src_str, sizeof(src_str)); inet_ntop(AF_INET, &ip->ip_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__, best_ia->ia_ifp->if_xname, src_str, dst_str, ip->ip_p, inifp->if_xname); } } else if (result == IP_CHECK_IF_DROP) { if (ip_checkinterface_debug > 0) { char src_str[MAX_IPv4_STR_LEN]; char dst_str[MAX_IPv4_STR_LEN]; inet_ntop(AF_INET, &ip->ip_src, src_str, sizeof(src_str)); inet_ntop(AF_INET, &ip->ip_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, ip->ip_p, inifp->if_xname); } struct mbuf *tmp_mbuf = m; while (tmp_mbuf != NULL) { ipstat.ips_rcv_if_no_match++; tmp_mbuf = tmp_mbuf->m_nextpkt; } m_freem_list(m); *mp = NULL; } return result; } static void ip_input_second_pass(struct mbuf *m, struct ifnet *inifp, int npkts_in_chain, int bytes_in_chain, struct ip_fw_in_args *args) { struct mbuf *tmp_mbuf = NULL; unsigned int hlen; #pragma unused (args) struct ip *ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; OSAddAtomic(npkts_in_chain, &ipstat.ips_total); /* * Naively assume we can attribute inbound data to the route we would * use to send to this destination. Asymmetric 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. */ ip_input_update_nstat(inifp, ip->ip_src, npkts_in_chain, bytes_in_chain); /* * Check our list of addresses, to see if the packet is for us. * If we don't have any addresses, assume any unicast packet * we receive might be for us (and let the upper layers deal * with it). */ tmp_mbuf = m; if (TAILQ_EMPTY(&in_ifaddrhead)) { while (tmp_mbuf != NULL) { if (!(tmp_mbuf->m_flags & (M_MCAST | M_BCAST))) { ip_setdstifaddr_info(tmp_mbuf, inifp->if_index, NULL); } tmp_mbuf = mbuf_nextpkt(tmp_mbuf); } goto ours; } /* * 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 - Checking also should be disabled if the destination * address is ipnat'ed to a different interface. * * XXX - Checking is incompatible with IP aliases added * to the loopback interface instead of the interface where * the packets are received. */ if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { ip_check_if_result_t ip_check_if_result = IP_CHECK_IF_NONE; ip_check_if_result = ip_input_check_interface(&m, ip, inifp); ASSERT(ip_check_if_result != IP_CHECK_IF_NONE); if (ip_check_if_result == IP_CHECK_IF_OURS) { goto ours; } else if (ip_check_if_result == IP_CHECK_IF_DROP) { return; } } else { struct in_multi *inm; /* * See if we belong to the destination multicast group on the * arrival interface. */ in_multihead_lock_shared(); IN_LOOKUP_MULTI(&ip->ip_dst, inifp, inm); in_multihead_lock_done(); if (inm == NULL) { OSAddAtomic(npkts_in_chain, &ipstat.ips_notmember); m_freem_list(m); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); return; } ip_input_setdst_chain(m, inifp->if_index, NULL); INM_REMREF(inm); goto ours; } tmp_mbuf = m; struct mbuf *nxt_mbuf = NULL; while (tmp_mbuf != NULL) { nxt_mbuf = mbuf_nextpkt(tmp_mbuf); /* * Not for us; forward if possible and desirable. */ mbuf_setnextpkt(tmp_mbuf, NULL); if (ipforwarding == 0) { OSAddAtomic(1, &ipstat.ips_cantforward); m_freem(tmp_mbuf); } else { ip_forward(tmp_mbuf, 0, NULL); } tmp_mbuf = nxt_mbuf; } KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); return; ours: ip = mtod(m, struct ip *); /* in case it changed */ /* * If offset is set, must reassemble. */ if (ip->ip_off & ~(IP_DF | IP_RF)) { VERIFY(npkts_in_chain == 1); m = ip_reass(m); if (m == NULL) { return; } ip = mtod(m, struct ip *); /* Get the header length of the reassembled packet */ hlen = IP_VHL_HL(ip->ip_vhl) << 2; } /* * Further protocols expect the packet length to be w/o the * IP header. */ ip->ip_len -= hlen; #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 && (ip_protox[ip->ip_p]->pr_flags & PR_LASTHDR)) { VERIFY(npkts_in_chain == 1); if (ipsec4_in_reject(m, NULL)) { IPSEC_STAT_INCREMENT(ipsecstat.in_polvio); goto bad; } } #endif /* IPSEC */ /* * Switch out to protocol's input routine. */ OSAddAtomic(npkts_in_chain, &ipstat.ips_delivered); ip_input_dispatch_chain(m); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); return; bad: KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); } void ip_input_process_list(struct mbuf *packet_list) { pktchain_elm_t pktchain_tbl[PKTTBL_SZ]; struct mbuf *packet = NULL; struct mbuf *modm = NULL; /* modified mbuf */ int retval = 0; #if (DEBUG || DEVELOPMENT) struct timeval start_tv; #endif /* (DEBUG || DEVELOPMENT) */ int num_pkts = 0; int chain = 0; struct ip_fw_in_args args; if (ip_chaining == 0) { struct mbuf *m = packet_list; #if (DEBUG || DEVELOPMENT) if (ip_input_measure) { net_perf_start_time(&net_perf, &start_tv); } #endif /* (DEBUG || DEVELOPMENT) */ while (m) { packet_list = mbuf_nextpkt(m); mbuf_setnextpkt(m, NULL); ip_input(m); m = packet_list; num_pkts++; } #if (DEBUG || DEVELOPMENT) if (ip_input_measure) { net_perf_measure_time(&net_perf, &start_tv, num_pkts); } #endif /* (DEBUG || DEVELOPMENT) */ return; } #if (DEBUG || DEVELOPMENT) if (ip_input_measure) { net_perf_start_time(&net_perf, &start_tv); } #endif /* (DEBUG || DEVELOPMENT) */ bzero(&pktchain_tbl, sizeof(pktchain_tbl)); restart_list_process: chain = 0; for (packet = packet_list; packet; packet = packet_list) { m_add_crumb(packet, PKT_CRUMB_IP_INPUT); packet_list = mbuf_nextpkt(packet); mbuf_setnextpkt(packet, NULL); num_pkts++; modm = NULL; bzero(&args, sizeof(args)); retval = ip_input_first_pass(packet, &args, &modm); if (retval == IPINPUT_DOCHAIN) { if (modm) { packet = modm; } packet = ip_chain_insert(packet, &pktchain_tbl[0]); if (packet == NULL) { ipstat.ips_rxc_chained++; chain++; if (chain > ip_chainsz) { break; } } else { ipstat.ips_rxc_collisions++; break; } } else if (retval == IPINPUT_DONTCHAIN) { /* in order to preserve order, exit from chaining */ if (modm) { packet = modm; } ipstat.ips_rxc_notchain++; break; } else { /* packet was freed or delivered, do nothing. */ } } /* do second pass here for pktchain_tbl */ if (chain) { ip_input_second_pass_loop_tbl(&pktchain_tbl[0], &args); } if (packet) { /* * equivalent update in chaining case if performed in * ip_input_second_pass_loop_tbl(). */ #if (DEBUG || DEVELOPMENT) if (ip_input_measure) { net_perf_histogram(&net_perf, 1); } #endif /* (DEBUG || DEVELOPMENT) */ ip_input_second_pass(packet, packet->m_pkthdr.rcvif, 1, packet->m_pkthdr.len, &args); } if (packet_list) { goto restart_list_process; } #if (DEBUG || DEVELOPMENT) if (ip_input_measure) { net_perf_measure_time(&net_perf, &start_tv, num_pkts); } #endif /* (DEBUG || DEVELOPMENT) */ } /* * Ip input routine. Checksum and byte swap header. If fragmented * try to reassemble. Process options. Pass to next level. */ void ip_input(struct mbuf *m) { struct ip *ip; unsigned int hlen; u_short sum = 0; #if DUMMYNET struct ip_fw_args args; struct m_tag *tag; #endif ipfilter_t inject_filter_ref = NULL; struct ifnet *inifp; /* Check if the mbuf is still valid after interface filter processing */ MBUF_INPUT_CHECK(m, m->m_pkthdr.rcvif); inifp = m->m_pkthdr.rcvif; VERIFY(inifp != NULL); m_add_crumb(m, PKT_CRUMB_IP_INPUT); ipstat.ips_rxc_notlist++; /* Perform IP header alignment fixup, if needed */ IP_HDR_ALIGNMENT_FIXUP(m, inifp, goto bad); m->m_pkthdr.pkt_flags &= ~PKTF_FORWARDED; #if DUMMYNET bzero(&args, sizeof(struct ip_fw_args)); /* * Don't bother searching for tag(s) if there's none. */ if (SLIST_EMPTY(&m->m_pkthdr.tags)) { goto ipfw_tags_done; } /* Grab info from mtags prepended to the chain */ 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 DIAGNOSTIC if (m == NULL || !(m->m_flags & M_PKTHDR)) { panic("ip_input no HDR"); } #endif if (args.fwa_pf_rule) { /* dummynet already filtered us */ ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; inject_filter_ref = ipf_get_inject_filter(m); if (args.fwa_pf_rule) { goto check_with_pf; } } ipfw_tags_done: #endif /* DUMMYNET */ /* * No need to process packet twice if we've already seen it. */ if (!SLIST_EMPTY(&m->m_pkthdr.tags)) { inject_filter_ref = ipf_get_inject_filter(m); } if (inject_filter_ref != NULL) { ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL, struct ip *, ip, struct ifnet *, inifp, struct ip *, ip, struct ip6_hdr *, NULL); ip->ip_len = ntohs(ip->ip_len) - (u_short)hlen; ip->ip_off = ntohs(ip->ip_off); ip_proto_dispatch_in(m, hlen, ip->ip_p, inject_filter_ref); return; } if (__improbable(m->m_pkthdr.pkt_flags & PKTF_WAKE_PKT)) { if_ports_used_match_mbuf(inifp, PF_INET, m); } OSAddAtomic(1, &ipstat.ips_total); if (m->m_pkthdr.len < sizeof(struct ip)) { goto tooshort; } if (m->m_len < sizeof(struct ip) && (m = m_pullup(m, sizeof(struct ip))) == NULL) { OSAddAtomic(1, &ipstat.ips_toosmall); return; } ip = mtod(m, struct ip *); KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr, ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); if (IP_VHL_V(ip->ip_vhl) != IPVERSION) { OSAddAtomic(1, &ipstat.ips_badvers); goto bad; } hlen = IP_VHL_HL(ip->ip_vhl) << 2; if (hlen < sizeof(struct ip)) { /* minimum header length */ OSAddAtomic(1, &ipstat.ips_badhlen); goto bad; } if (hlen > m->m_len) { if ((m = m_pullup(m, hlen)) == NULL) { OSAddAtomic(1, &ipstat.ips_badhlen); return; } ip = mtod(m, struct ip *); } /* 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) { /* * Allow for the following exceptions: * * 1. If the packet was sent to loopback (i.e. rcvif * would have been set earlier at output time.) * * 2. If the packet was sent out on loopback from a local * source address which belongs to a non-loopback * interface (i.e. rcvif may not necessarily be a * loopback interface, hence the test for PKTF_LOOP.) * Unlike IPv6, there is no interface scope ID, and * therefore we don't care so much about PKTF_IFINFO. */ if (!(inifp->if_flags & IFF_LOOPBACK) && !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { OSAddAtomic(1, &ipstat.ips_badaddr); goto bad; } } /* IPv4 Link-Local Addresses as defined in RFC3927 */ if ((IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)))) { ip_linklocal_stat.iplls_in_total++; if (ip->ip_ttl != MAXTTL) { OSAddAtomic(1, &ip_linklocal_stat.iplls_in_badttl); /* Silently drop link local traffic with bad TTL */ if (!ip_linklocal_in_allowbadttl) { goto bad; } } } sum = ip_cksum(m, hlen); if (sum) { goto bad; } DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL, struct ip *, ip, struct ifnet *, inifp, struct ip *, ip, struct ip6_hdr *, NULL); /* * Naively assume we can attribute inbound data to the route we would * use to send to this destination. Asymmetric 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 *rt = ifnet_cached_rtlookup_inet(inifp, ip->ip_src); if (rt != NULL) { nstat_route_rx(rt, 1, m->m_pkthdr.len, 0); rtfree(rt); } } /* * Convert fields to host representation. */ #if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_len); #endif if (ip->ip_len < hlen) { OSAddAtomic(1, &ipstat.ips_badlen); goto bad; } #if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_off); #endif /* * Check that the amount of data in the buffers * is as at least 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 < ip->ip_len) { tooshort: OSAddAtomic(1, &ipstat.ips_tooshort); goto bad; } if (m->m_pkthdr.len > ip->ip_len) { ip_input_adjust(m, ip, inifp); } #if DUMMYNET check_with_pf: #endif #if PF /* Invoke inbound packet filter */ if (PF_IS_ENABLED) { int error; #if DUMMYNET error = pf_af_hook(inifp, NULL, &m, AF_INET, TRUE, &args); #else error = pf_af_hook(inifp, NULL, &m, AF_INET, TRUE, NULL); #endif /* DUMMYNET */ if (error != 0 || m == NULL) { if (m != NULL) { panic("%s: unexpected packet %p", __func__, m); /* NOTREACHED */ } /* Already freed by callee */ return; } ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; } #endif /* PF */ #if IPSEC if (ipsec_bypass == 0 && ipsec_gethist(m, NULL)) { goto pass; } #endif pass: /* * 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). */ ip_nhops = 0; /* for source routed packets */ if (hlen > sizeof(struct ip) && ip_dooptions(m, 0, NULL)) { return; } /* * Check our list of addresses, to see if the packet is for us. * If we don't have any addresses, assume any unicast packet * we receive might be for us (and let the upper layers deal * with it). */ if (TAILQ_EMPTY(&in_ifaddrhead) && !(m->m_flags & (M_MCAST | M_BCAST))) { ip_setdstifaddr_info(m, inifp->if_index, NULL); goto ours; } /* * 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 and the packet is not subject to * 'ipfw fwd'. * * XXX - Checking also should be disabled if the destination * address is ipnat'ed to a different interface. * * XXX - Checking is incompatible with IP aliases added * to the loopback interface instead of the interface where * the packets are received. */ if (!IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { ip_check_if_result_t check_if_result = IP_CHECK_IF_NONE; check_if_result = ip_input_check_interface(&m, ip, inifp); ASSERT(check_if_result != IP_CHECK_IF_NONE); if (check_if_result == IP_CHECK_IF_OURS) { goto ours; } else if (check_if_result == IP_CHECK_IF_DROP) { return; } } else { struct in_multi *inm; /* * See if we belong to the destination multicast group on the * arrival interface. */ in_multihead_lock_shared(); IN_LOOKUP_MULTI(&ip->ip_dst, inifp, inm); in_multihead_lock_done(); if (inm == NULL) { OSAddAtomic(1, &ipstat.ips_notmember); m_freem(m); return; } ip_setdstifaddr_info(m, inifp->if_index, NULL); INM_REMREF(inm); goto ours; } /* * Not for us; forward if possible and desirable. */ if (ipforwarding == 0) { OSAddAtomic(1, &ipstat.ips_cantforward); m_freem(m); } else { ip_forward(m, 0, NULL); } return; ours: /* * If offset or IP_MF are set, must reassemble. */ if (ip->ip_off & ~(IP_DF | IP_RF)) { m = ip_reass(m); if (m == NULL) { return; } ip = mtod(m, struct ip *); /* Get the header length of the reassembled packet */ hlen = IP_VHL_HL(ip->ip_vhl) << 2; } /* * Further protocols expect the packet length to be w/o the * IP header. */ ip->ip_len -= hlen; #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 && (ip_protox[ip->ip_p]->pr_flags & PR_LASTHDR)) { if (ipsec4_in_reject(m, NULL)) { IPSEC_STAT_INCREMENT(ipsecstat.in_polvio); goto bad; } } #endif /* IPSEC */ /* * Switch out to protocol's input routine. */ OSAddAtomic(1, &ipstat.ips_delivered); ip_proto_dispatch_in(m, hlen, ip->ip_p, 0); return; bad: KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); } static void ipq_updateparams(void) { LCK_MTX_ASSERT(&ipqlock, LCK_MTX_ASSERT_OWNED); /* * -1 for unlimited allocation. */ if (maxnipq < 0) { ipq_limit = 0; } /* * Positive number for specific bound. */ if (maxnipq > 0) { ipq_limit = maxnipq; } /* * Zero specifies no further fragment queue allocation -- set the * bound very low, but rely on implementation elsewhere to actually * prevent allocation and reclaim current queues. */ if (maxnipq == 0) { ipq_limit = 1; } /* * Arm the purge timer if not already and if there's work to do */ frag_sched_timeout(); } static int sysctl_maxnipq SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error, i; lck_mtx_lock(&ipqlock); i = maxnipq; error = sysctl_handle_int(oidp, &i, 0, req); if (error || req->newptr == USER_ADDR_NULL) { goto done; } /* impose bounds */ if (i < -1 || i > (nmbclusters / 4)) { error = EINVAL; goto done; } maxnipq = i; ipq_updateparams(); done: lck_mtx_unlock(&ipqlock); return error; } static int sysctl_maxfragsperpacket SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error, i; lck_mtx_lock(&ipqlock); i = maxfragsperpacket; error = sysctl_handle_int(oidp, &i, 0, req); if (error || req->newptr == USER_ADDR_NULL) { goto done; } maxfragsperpacket = i; ipq_updateparams(); /* see if we need to arm timer */ done: lck_mtx_unlock(&ipqlock); return error; } /* * Take incoming datagram fragment and try to reassemble it into * whole datagram. If a chain for reassembly of this datagram already * exists, then it is given as fp; otherwise have to make a chain. * * The IP header is *NOT* adjusted out of iplen (but in host byte order). */ static struct mbuf * ip_reass(struct mbuf *m) { struct ip *ip; struct mbuf *p, *q, *nq, *t; struct ipq *fp = NULL; struct ipqhead *head; int i, hlen, next; u_int8_t ecn, ecn0; uint32_t csum, csum_flags; uint16_t hash; struct fq_head dfq; MBUFQ_INIT(&dfq); /* for deferred frees */ /* If maxnipq or maxfragsperpacket is 0, never accept fragments. */ if (maxnipq == 0 || maxfragsperpacket == 0) { ipstat.ips_fragments++; ipstat.ips_fragdropped++; m_freem(m); if (nipq > 0) { lck_mtx_lock(&ipqlock); frag_sched_timeout(); /* purge stale fragments */ lck_mtx_unlock(&ipqlock); } return NULL; } ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2; lck_mtx_lock(&ipqlock); hash = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id); head = &ipq[hash]; /* * Look for queue of fragments * of this datagram. */ TAILQ_FOREACH(fp, head, ipq_list) { if (ip->ip_id == fp->ipq_id && ip->ip_src.s_addr == fp->ipq_src.s_addr && ip->ip_dst.s_addr == fp->ipq_dst.s_addr && ip->ip_p == fp->ipq_p) { goto found; } } fp = NULL; /* * Attempt to trim the number of allocated fragment queues if it * exceeds the administrative limit. */ if ((nipq > (unsigned)maxnipq) && (maxnipq > 0)) { /* * drop something from the tail of the current queue * before proceeding further */ struct ipq *fq = TAILQ_LAST(head, ipqhead); if (fq == NULL) { /* gak */ for (i = 0; i < IPREASS_NHASH; i++) { struct ipq *r = TAILQ_LAST(&ipq[i], ipqhead); if (r) { ipstat.ips_fragtimeout += r->ipq_nfrags; frag_freef(&ipq[i], r); break; } } } else { ipstat.ips_fragtimeout += fq->ipq_nfrags; frag_freef(head, fq); } } found: /* * Leverage partial checksum offload for IP fragments. Narrow down * the scope to cover only UDP without IP options, as that is the * most common case. * * Perform 1's complement adjustment of octets that got included/ * excluded in the hardware-calculated checksum value. Ignore cases * where the value includes the entire IPv4 header span, as the sum * for those octets would already be 0 by the time we get here; IP * has already performed its header checksum validation. Also take * care of any trailing bytes and subtract out their partial sum. */ if (ip->ip_p == IPPROTO_UDP && hlen == sizeof(struct ip) && (m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PARTIAL | CSUM_PSEUDO_HDR)) == (CSUM_DATA_VALID | CSUM_PARTIAL)) { uint32_t start = m->m_pkthdr.csum_rx_start; int32_t trailer = (m_pktlen(m) - ip->ip_len); uint32_t swbytes = (uint32_t)trailer; csum = m->m_pkthdr.csum_rx_val; ASSERT(trailer >= 0); if ((start != 0 && start != hlen) || trailer != 0) { uint32_t datalen = ip->ip_len - hlen; #if BYTE_ORDER != BIG_ENDIAN if (start < hlen) { HTONS(ip->ip_len); HTONS(ip->ip_off); } #endif /* BYTE_ORDER != BIG_ENDIAN */ /* callee folds in sum */ csum = m_adj_sum16(m, start, hlen, datalen, csum); if (hlen > start) { swbytes += (hlen - start); } else { swbytes += (start - hlen); } #if BYTE_ORDER != BIG_ENDIAN if (start < hlen) { NTOHS(ip->ip_off); NTOHS(ip->ip_len); } #endif /* BYTE_ORDER != BIG_ENDIAN */ } csum_flags = m->m_pkthdr.csum_flags; if (swbytes != 0) { udp_in_cksum_stats(swbytes); } if (trailer != 0) { m_adj(m, -trailer); } } else { csum = 0; csum_flags = 0; } /* Invalidate checksum */ m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID; ipstat.ips_fragments++; /* * Adjust ip_len to not reflect header, * convert offset of this to bytes. */ ip->ip_len -= hlen; if (ip->ip_off & IP_MF) { /* * Make sure that fragments have a data length * that's a non-zero multiple of 8 bytes. */ if (ip->ip_len == 0 || (ip->ip_len & 0x7) != 0) { OSAddAtomic(1, &ipstat.ips_toosmall); /* * Reassembly queue may have been found if previous * fragments were valid; given that this one is bad, * we need to drop it. Make sure to set fp to NULL * if not already, since we don't want to decrement * ipq_nfrags as it doesn't include this packet. */ fp = NULL; goto dropfrag; } m->m_flags |= M_FRAG; } else { /* Clear the flag in case packet comes from loopback */ m->m_flags &= ~M_FRAG; } ip->ip_off <<= 3; m->m_pkthdr.pkt_hdr = ip; /* Previous ip_reass() started here. */ /* * Presence of header sizes in mbufs * would confuse code below. */ m->m_data += hlen; m->m_len -= hlen; /* * If first fragment to arrive, create a reassembly queue. */ if (fp == NULL) { fp = ipq_alloc(M_DONTWAIT); if (fp == NULL) { goto dropfrag; } TAILQ_INSERT_HEAD(head, fp, ipq_list); nipq++; fp->ipq_nfrags = 1; fp->ipq_ttl = IPFRAGTTL; fp->ipq_p = ip->ip_p; fp->ipq_id = ip->ip_id; fp->ipq_src = ip->ip_src; fp->ipq_dst = ip->ip_dst; fp->ipq_frags = m; m->m_nextpkt = NULL; /* * If the first fragment has valid checksum offload * info, the rest of fragments are eligible as well. */ if (csum_flags != 0) { fp->ipq_csum = csum; fp->ipq_csum_flags = csum_flags; } m = NULL; /* nothing to return */ goto done; } else { fp->ipq_nfrags++; } #define GETIP(m) ((struct ip *)((m)->m_pkthdr.pkt_hdr)) /* * Handle ECN by comparing this segment with the first one; * if CE is set, do not lose CE. * drop if CE and not-ECT are mixed for the same packet. */ ecn = ip->ip_tos & IPTOS_ECN_MASK; ecn0 = GETIP(fp->ipq_frags)->ip_tos & IPTOS_ECN_MASK; if (ecn == IPTOS_ECN_CE) { if (ecn0 == IPTOS_ECN_NOTECT) { goto dropfrag; } if (ecn0 != IPTOS_ECN_CE) { GETIP(fp->ipq_frags)->ip_tos |= IPTOS_ECN_CE; } } if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT) { goto dropfrag; } /* * Find a segment which begins after this one does. */ for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) { if (GETIP(q)->ip_off > ip->ip_off) { break; } } /* * If there is a preceding segment, it may provide some of * our data already. If so, drop the data from the incoming * segment. If it provides all of our data, drop us, otherwise * stick new segment in the proper place. * * If some of the data is dropped from the preceding * segment, then it's checksum is invalidated. */ if (p) { i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off; if (i > 0) { if (i >= ip->ip_len) { goto dropfrag; } m_adj(m, i); fp->ipq_csum_flags = 0; ip->ip_off += i; ip->ip_len -= i; } m->m_nextpkt = p->m_nextpkt; p->m_nextpkt = m; } else { m->m_nextpkt = fp->ipq_frags; fp->ipq_frags = m; } /* * While we overlap succeeding segments trim them or, * if they are completely covered, dequeue them. */ for (; q != NULL && ip->ip_off + ip->ip_len > GETIP(q)->ip_off; q = nq) { i = (ip->ip_off + ip->ip_len) - GETIP(q)->ip_off; if (i < GETIP(q)->ip_len) { GETIP(q)->ip_len -= i; GETIP(q)->ip_off += i; m_adj(q, i); fp->ipq_csum_flags = 0; break; } nq = q->m_nextpkt; m->m_nextpkt = nq; ipstat.ips_fragdropped++; fp->ipq_nfrags--; /* defer freeing until after lock is dropped */ MBUFQ_ENQUEUE(&dfq, q); } /* * If this fragment contains similar checksum offload info * as that of the existing ones, accumulate checksum. Otherwise, * invalidate checksum offload info for the entire datagram. */ if (csum_flags != 0 && csum_flags == fp->ipq_csum_flags) { fp->ipq_csum += csum; } else if (fp->ipq_csum_flags != 0) { fp->ipq_csum_flags = 0; } /* * Check for complete reassembly and perform frag per packet * limiting. * * Frag limiting is performed here so that the nth frag has * a chance to complete the packet before we drop the packet. * As a result, n+1 frags are actually allowed per packet, but * only n will ever be stored. (n = maxfragsperpacket.) * */ next = 0; for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) { if (GETIP(q)->ip_off != next) { if (fp->ipq_nfrags > maxfragsperpacket) { ipstat.ips_fragdropped += fp->ipq_nfrags; frag_freef(head, fp); } m = NULL; /* nothing to return */ goto done; } next += GETIP(q)->ip_len; } /* Make sure the last packet didn't have the IP_MF flag */ if (p->m_flags & M_FRAG) { if (fp->ipq_nfrags > maxfragsperpacket) { ipstat.ips_fragdropped += fp->ipq_nfrags; frag_freef(head, fp); } m = NULL; /* nothing to return */ goto done; } /* * Reassembly is complete. Make sure the packet is a sane size. */ q = fp->ipq_frags; ip = GETIP(q); if (next + (IP_VHL_HL(ip->ip_vhl) << 2) > IP_MAXPACKET) { ipstat.ips_toolong++; ipstat.ips_fragdropped += fp->ipq_nfrags; frag_freef(head, fp); m = NULL; /* nothing to return */ goto done; } /* * Concatenate fragments. */ m = q; t = m->m_next; m->m_next = NULL; m_cat(m, t); nq = q->m_nextpkt; q->m_nextpkt = NULL; for (q = nq; q != NULL; q = nq) { nq = q->m_nextpkt; q->m_nextpkt = NULL; m_cat(m, q); } /* * Store partial hardware checksum info from the fragment queue; * the receive start offset is set to 20 bytes (see code at the * top of this routine.) */ if (fp->ipq_csum_flags != 0) { csum = fp->ipq_csum; ADDCARRY(csum); m->m_pkthdr.csum_rx_val = (uint16_t)csum; m->m_pkthdr.csum_rx_start = sizeof(struct ip); m->m_pkthdr.csum_flags = fp->ipq_csum_flags; } else if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) || (m->m_pkthdr.pkt_flags & PKTF_LOOP)) { /* loopback checksums are always OK */ m->m_pkthdr.csum_data = 0xffff; m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID; } /* * Create header for new ip packet by modifying header of first * packet; dequeue and discard fragment reassembly header. * Make header visible. */ ip->ip_len = (u_short)((IP_VHL_HL(ip->ip_vhl) << 2) + next); ip->ip_src = fp->ipq_src; ip->ip_dst = fp->ipq_dst; fp->ipq_frags = NULL; /* return to caller as 'm' */ frag_freef(head, fp); fp = NULL; m->m_len += (IP_VHL_HL(ip->ip_vhl) << 2); m->m_data -= (IP_VHL_HL(ip->ip_vhl) << 2); /* some debugging cruft by sklower, below, will go away soon */ if (m->m_flags & M_PKTHDR) { /* XXX this should be done elsewhere */ m_fixhdr(m); } ipstat.ips_reassembled++; /* arm the purge timer if not already and if there's work to do */ frag_sched_timeout(); lck_mtx_unlock(&ipqlock); /* perform deferred free (if needed) now that lock is dropped */ if (!MBUFQ_EMPTY(&dfq)) { MBUFQ_DRAIN(&dfq); } VERIFY(MBUFQ_EMPTY(&dfq)); return m; done: VERIFY(m == NULL); /* arm the purge timer if not already and if there's work to do */ frag_sched_timeout(); lck_mtx_unlock(&ipqlock); /* perform deferred free (if needed) */ if (!MBUFQ_EMPTY(&dfq)) { MBUFQ_DRAIN(&dfq); } VERIFY(MBUFQ_EMPTY(&dfq)); return NULL; dropfrag: ipstat.ips_fragdropped++; if (fp != NULL) { fp->ipq_nfrags--; } /* arm the purge timer if not already and if there's work to do */ frag_sched_timeout(); lck_mtx_unlock(&ipqlock); m_freem(m); /* perform deferred free (if needed) */ if (!MBUFQ_EMPTY(&dfq)) { MBUFQ_DRAIN(&dfq); } VERIFY(MBUFQ_EMPTY(&dfq)); return NULL; #undef GETIP } /* * Free a fragment reassembly header and all * associated datagrams. */ static void frag_freef(struct ipqhead *fhp, struct ipq *fp) { LCK_MTX_ASSERT(&ipqlock, LCK_MTX_ASSERT_OWNED); fp->ipq_nfrags = 0; if (fp->ipq_frags != NULL) { m_freem_list(fp->ipq_frags); fp->ipq_frags = NULL; } TAILQ_REMOVE(fhp, fp, ipq_list); nipq--; ipq_free(fp); } /* * IP reassembly timer processing */ static void frag_timeout(void *arg) { #pragma unused(arg) struct ipq *fp; int i; /* * Update coarse-grained networking timestamp (in sec.); the idea * is to piggy-back on the timeout callout to update the counter * returnable via net_uptime(). */ net_update_uptime(); lck_mtx_lock(&ipqlock); for (i = 0; i < IPREASS_NHASH; i++) { for (fp = TAILQ_FIRST(&ipq[i]); fp;) { struct ipq *fpp; fpp = fp; fp = TAILQ_NEXT(fp, ipq_list); if (--fpp->ipq_ttl == 0) { ipstat.ips_fragtimeout += fpp->ipq_nfrags; frag_freef(&ipq[i], fpp); } } } /* * If we are over the maximum number of fragments * (due to the limit being lowered), drain off * enough to get down to the new limit. */ if (maxnipq >= 0 && nipq > (unsigned)maxnipq) { for (i = 0; i < IPREASS_NHASH; i++) { while (nipq > (unsigned)maxnipq && !TAILQ_EMPTY(&ipq[i])) { ipstat.ips_fragdropped += TAILQ_FIRST(&ipq[i])->ipq_nfrags; frag_freef(&ipq[i], TAILQ_FIRST(&ipq[i])); } } } /* re-arm the purge timer if there's work to do */ frag_timeout_run = 0; frag_sched_timeout(); lck_mtx_unlock(&ipqlock); } static void frag_sched_timeout(void) { LCK_MTX_ASSERT(&ipqlock, LCK_MTX_ASSERT_OWNED); if (!frag_timeout_run && nipq > 0) { frag_timeout_run = 1; timeout(frag_timeout, NULL, hz); } } /* * Drain off all datagram fragments. */ static void frag_drain(void) { int i; lck_mtx_lock(&ipqlock); for (i = 0; i < IPREASS_NHASH; i++) { while (!TAILQ_EMPTY(&ipq[i])) { ipstat.ips_fragdropped += TAILQ_FIRST(&ipq[i])->ipq_nfrags; frag_freef(&ipq[i], TAILQ_FIRST(&ipq[i])); } } lck_mtx_unlock(&ipqlock); } static struct ipq * ipq_alloc(int how) { struct mbuf *t; struct ipq *fp; /* * See comments in ipq_updateparams(). Keep the count separate * from nipq since the latter represents the elements already * in the reassembly queues. */ if (ipq_limit > 0 && ipq_count > ipq_limit) { return NULL; } t = m_get(how, MT_FTABLE); if (t != NULL) { atomic_add_32(&ipq_count, 1); fp = mtod(t, struct ipq *); bzero(fp, sizeof(*fp)); } else { fp = NULL; } return fp; } static void ipq_free(struct ipq *fp) { (void) m_free(dtom(fp)); atomic_add_32(&ipq_count, -1); } /* * Drain callback */ void ip_drain(void) { frag_drain(); /* fragments */ in_rtqdrain(); /* protocol cloned routes */ in_arpdrain(NULL); /* cloned routes: ARP */ } /* * Do option processing on a datagram, * possibly discarding it if bad options are encountered, * or forwarding it if source-routed. * The pass argument is used when operating in the IPSTEALTH * mode to tell what options to process: * [LS]SRR (pass 0) or the others (pass 1). * The reason for as many as two passes is that when doing IPSTEALTH, * non-routing options should be processed only if the packet is for us. * Returns 1 if packet has been forwarded/freed, * 0 if the packet should be processed further. */ static int ip_dooptions(struct mbuf *m, int pass, struct sockaddr_in *next_hop) { #pragma unused(pass) struct ip *ip = mtod(m, struct ip *); u_char *cp; struct ip_timestamp *ipt; struct in_ifaddr *ia; int opt, optlen, cnt, off, type = ICMP_PARAMPROB, forward = 0; uint8_t code = 0; struct in_addr *sin, dst; u_int32_t ntime; struct sockaddr_in ipaddr = { .sin_len = sizeof(ipaddr), .sin_family = AF_INET, .sin_port = 0, .sin_addr = { .s_addr = 0 }, .sin_zero = { 0, } }; /* Expect 32-bit aligned data pointer on strict-align platforms */ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); dst = ip->ip_dst; cp = (u_char *)(ip + 1); cnt = (IP_VHL_HL(ip->ip_vhl) << 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 = (uint8_t)(&cp[IPOPT_OLEN] - (u_char *)ip); goto bad; } optlen = cp[IPOPT_OLEN]; if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { code = (uint8_t)(&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: if (optlen < IPOPT_OFFSET + sizeof(*cp)) { code = (uint8_t)(&cp[IPOPT_OLEN] - (u_char *)ip); goto bad; } if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { code = (uint8_t)(&cp[IPOPT_OFFSET] - (u_char *)ip); goto bad; } ipaddr.sin_addr = ip->ip_dst; ia = (struct in_ifaddr *)ifa_ifwithaddr(SA(&ipaddr)); if (ia == NULL) { if (opt == IPOPT_SSRR) { type = ICMP_UNREACH; code = ICMP_UNREACH_SRCFAIL; goto bad; } if (!ip_dosourceroute) { goto nosourcerouting; } /* * Loose routing, and not at next destination * yet; nothing to do except forward. */ break; } else { IFA_REMREF(&ia->ia_ifa); ia = NULL; } off--; /* 0 origin */ if (off > optlen - (int)sizeof(struct in_addr)) { /* * End of source route. Should be for us. */ if (!ip_acceptsourceroute) { goto nosourcerouting; } save_rte(cp, ip->ip_src); break; } if (!ip_dosourceroute) { if (ipforwarding) { char buf[MAX_IPv4_STR_LEN]; char buf2[MAX_IPv4_STR_LEN]; /* * Acting as a router, so generate ICMP */ nosourcerouting: log(LOG_WARNING, "attempted source route from %s " "to %s\n", inet_ntop(AF_INET, &ip->ip_src, buf, sizeof(buf)), inet_ntop(AF_INET, &ip->ip_dst, buf2, sizeof(buf2))); type = ICMP_UNREACH; code = ICMP_UNREACH_SRCFAIL; goto bad; } else { /* * Not acting as a router, * so silently drop. */ OSAddAtomic(1, &ipstat.ips_cantforward); m_freem(m); return 1; } } /* * locate outgoing interface */ (void) memcpy(&ipaddr.sin_addr, cp + off, sizeof(ipaddr.sin_addr)); if (opt == IPOPT_SSRR) { #define INA struct in_ifaddr * if ((ia = (INA)ifa_ifwithdstaddr( SA(&ipaddr))) == NULL) { ia = (INA)ifa_ifwithnet(SA(&ipaddr)); } } else { ia = ip_rtaddr(ipaddr.sin_addr); } if (ia == NULL) { type = ICMP_UNREACH; code = ICMP_UNREACH_SRCFAIL; goto bad; } ip->ip_dst = ipaddr.sin_addr; IFA_LOCK(&ia->ia_ifa); (void) memcpy(cp + off, &(IA_SIN(ia)->sin_addr), sizeof(struct in_addr)); IFA_UNLOCK(&ia->ia_ifa); IFA_REMREF(&ia->ia_ifa); ia = NULL; cp[IPOPT_OFFSET] += sizeof(struct in_addr); /* * Let ip_intr's mcast routing check handle mcast pkts */ forward = !IN_MULTICAST(ntohl(ip->ip_dst.s_addr)); break; case IPOPT_RR: if (optlen < IPOPT_OFFSET + sizeof(*cp)) { code = (uint8_t)(&cp[IPOPT_OFFSET] - (u_char *)ip); goto bad; } if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { code = (uint8_t)(&cp[IPOPT_OFFSET] - (u_char *)ip); goto bad; } /* * If no space remains, ignore. */ off--; /* 0 origin */ if (off > optlen - (int)sizeof(struct in_addr)) { break; } (void) memcpy(&ipaddr.sin_addr, &ip->ip_dst, sizeof(ipaddr.sin_addr)); /* * locate outgoing interface; if we're the destination, * use the incoming interface (should be same). */ if ((ia = (INA)ifa_ifwithaddr(SA(&ipaddr))) == NULL) { if ((ia = ip_rtaddr(ipaddr.sin_addr)) == NULL) { type = ICMP_UNREACH; code = ICMP_UNREACH_HOST; goto bad; } } IFA_LOCK(&ia->ia_ifa); (void) memcpy(cp + off, &(IA_SIN(ia)->sin_addr), sizeof(struct in_addr)); IFA_UNLOCK(&ia->ia_ifa); IFA_REMREF(&ia->ia_ifa); ia = NULL; cp[IPOPT_OFFSET] += sizeof(struct in_addr); break; case IPOPT_TS: code = (uint8_t)(cp - (u_char *)ip); ipt = (struct ip_timestamp *)(void *)cp; if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { code = (uint8_t)((u_char *)&ipt->ipt_len - (u_char *)ip); goto bad; } if (ipt->ipt_ptr < 5) { code = (uint8_t)((u_char *)&ipt->ipt_ptr - (u_char *)ip); goto bad; } if (ipt->ipt_ptr > ipt->ipt_len - (int)sizeof(int32_t)) { if (++ipt->ipt_oflw == 0) { code = (uint8_t)((u_char *)&ipt->ipt_ptr - (u_char *)ip); goto bad; } break; } sin = (struct in_addr *)(void *)(cp + ipt->ipt_ptr - 1); switch (ipt->ipt_flg) { case IPOPT_TS_TSONLY: break; case IPOPT_TS_TSANDADDR: if (ipt->ipt_ptr - 1 + sizeof(n_time) + sizeof(struct in_addr) > ipt->ipt_len) { code = (uint8_t)((u_char *)&ipt->ipt_ptr - (u_char *)ip); goto bad; } ipaddr.sin_addr = dst; ia = (INA)ifaof_ifpforaddr(SA(&ipaddr), m->m_pkthdr.rcvif); if (ia == NULL) { continue; } IFA_LOCK(&ia->ia_ifa); (void) memcpy(sin, &IA_SIN(ia)->sin_addr, sizeof(struct in_addr)); IFA_UNLOCK(&ia->ia_ifa); ipt->ipt_ptr += sizeof(struct in_addr); IFA_REMREF(&ia->ia_ifa); ia = NULL; break; case IPOPT_TS_PRESPEC: if (ipt->ipt_ptr - 1 + sizeof(n_time) + sizeof(struct in_addr) > ipt->ipt_len) { code = (uint8_t)((u_char *)&ipt->ipt_ptr - (u_char *)ip); goto bad; } (void) memcpy(&ipaddr.sin_addr, sin, sizeof(struct in_addr)); if ((ia = (struct in_ifaddr *)ifa_ifwithaddr( SA(&ipaddr))) == NULL) { continue; } IFA_REMREF(&ia->ia_ifa); ia = NULL; ipt->ipt_ptr += sizeof(struct in_addr); break; default: /* XXX can't take &ipt->ipt_flg */ code = (uint8_t)((u_char *)&ipt->ipt_ptr - (u_char *)ip + 1); goto bad; } ntime = iptime(); (void) memcpy(cp + ipt->ipt_ptr - 1, &ntime, sizeof(n_time)); ipt->ipt_ptr += sizeof(n_time); } } if (forward && ipforwarding) { ip_forward(m, 1, next_hop); return 1; } return 0; bad: icmp_error(m, type, code, 0, 0); OSAddAtomic(1, &ipstat.ips_badoptions); return 1; } /* * Check for the presence of the IP Router Alert option [RFC2113] * in the header of an IPv4 datagram. * * This call is not intended for use from the forwarding path; it is here * so that protocol domains may check for the presence of the option. * Given how FreeBSD's IPv4 stack is currently structured, the Router Alert * option does not have much relevance to the implementation, though this * may change in future. * Router alert options SHOULD be passed if running in IPSTEALTH mode and * we are not the endpoint. * Length checks on individual options should already have been peformed * by ip_dooptions() therefore they are folded under DIAGNOSTIC here. * * Return zero if not present or options are invalid, non-zero if present. */ int ip_checkrouteralert(struct mbuf *m) { struct ip *ip = mtod(m, struct ip *); u_char *cp; int opt, optlen, cnt, found_ra; found_ra = 0; cp = (u_char *)(ip + 1); cnt = (IP_VHL_HL(ip->ip_vhl) << 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 { #ifdef DIAGNOSTIC if (cnt < IPOPT_OLEN + sizeof(*cp)) { break; } #endif optlen = cp[IPOPT_OLEN]; #ifdef DIAGNOSTIC if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) { break; } #endif } switch (opt) { case IPOPT_RA: #ifdef DIAGNOSTIC if (optlen != IPOPT_OFFSET + sizeof(uint16_t) || (*((uint16_t *)(void *)&cp[IPOPT_OFFSET]) != 0)) { break; } else #endif found_ra = 1; break; default: break; } } return found_ra; } /* * Given address of next destination (final or next hop), * return internet address info of interface to be used to get there. */ struct in_ifaddr * ip_rtaddr(struct in_addr dst) { struct sockaddr_in *sin; struct ifaddr *rt_ifa; struct route ro; bzero(&ro, sizeof(ro)); sin = SIN(&ro.ro_dst); sin->sin_family = AF_INET; sin->sin_len = sizeof(*sin); sin->sin_addr = dst; rtalloc_ign(&ro, RTF_PRCLONING); if (ro.ro_rt == NULL) { ROUTE_RELEASE(&ro); return NULL; } RT_LOCK(ro.ro_rt); if ((rt_ifa = ro.ro_rt->rt_ifa) != NULL) { IFA_ADDREF(rt_ifa); } RT_UNLOCK(ro.ro_rt); ROUTE_RELEASE(&ro); return (struct in_ifaddr *)rt_ifa; } /* * Save incoming source route for use in replies, * to be picked up later by ip_srcroute if the receiver is interested. */ void save_rte(u_char *option, struct in_addr dst) { unsigned olen; olen = option[IPOPT_OLEN]; #if DIAGNOSTIC if (ipprintfs) { printf("save_rte: olen %d\n", olen); } #endif if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) { return; } bcopy(option, ip_srcrt.srcopt, olen); ip_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr); ip_srcrt.dst = dst; } /* * 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(void) { struct in_addr *p, *q; struct mbuf *m; if (ip_nhops == 0) { return NULL; } m = m_get(M_DONTWAIT, MT_HEADER); if (m == NULL) { return NULL; } #define OPTSIZ (sizeof (ip_srcrt.nop) + sizeof (ip_srcrt.srcopt)) /* length is (nhops+1)*sizeof(addr) + sizeof(nop + srcrt header) */ m->m_len = ip_nhops * sizeof(struct in_addr) + sizeof(struct in_addr) + OPTSIZ; #if DIAGNOSTIC if (ipprintfs) { printf("ip_srcroute: nhops %d mlen %d", ip_nhops, m->m_len); } #endif /* * First save first hop for return route */ p = &ip_srcrt.route[ip_nhops - 1]; *(mtod(m, struct in_addr *)) = *p--; #if DIAGNOSTIC if (ipprintfs) { printf(" hops %lx", (u_int32_t)ntohl(mtod(m, struct in_addr *)->s_addr)); } #endif /* * Copy option fields and padding (nop) to mbuf. */ ip_srcrt.nop = IPOPT_NOP; ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; (void) memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), &ip_srcrt.nop, OPTSIZ); q = (struct in_addr *)(void *)(mtod(m, caddr_t) + sizeof(struct in_addr) + OPTSIZ); #undef OPTSIZ /* * Record return path as an IP source route, * reversing the path (pointers are now aligned). */ while (p >= ip_srcrt.route) { #if DIAGNOSTIC if (ipprintfs) { printf(" %lx", (u_int32_t)ntohl(q->s_addr)); } #endif *q++ = *p--; } /* * Last hop goes to final destination. */ *q = ip_srcrt.dst; #if DIAGNOSTIC if (ipprintfs) { printf(" %lx\n", (u_int32_t)ntohl(q->s_addr)); } #endif return m; } /* * Strip out IP options, at higher level protocol in the kernel. */ void ip_stripoptions(struct mbuf *m) { int i; struct ip *ip = mtod(m, struct ip *); caddr_t opts; int olen; /* Expect 32-bit aligned data pointer on strict-align platforms */ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); /* use bcopy() since it supports overlapping range */ olen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip); opts = (caddr_t)(ip + 1); i = m->m_len - (sizeof(struct ip) + olen); bcopy(opts + olen, opts, (unsigned)i); m->m_len -= olen; if (m->m_flags & M_PKTHDR) { m->m_pkthdr.len -= olen; } ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2); /* * We expect ip_{off,len} to be in host order by now, and * that the original IP header length has been subtracted * out from ip_len. Temporarily adjust ip_len for checksum * recalculation, and restore it afterwards. */ ip->ip_len += sizeof(struct ip); /* recompute checksum now that IP header is smaller */ #if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); #endif /* BYTE_ORDER != BIG_ENDIAN */ ip->ip_sum = in_cksum_hdr(ip); #if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_off); NTOHS(ip->ip_len); #endif /* BYTE_ORDER != BIG_ENDIAN */ ip->ip_len -= sizeof(struct ip); /* * Given that we've just stripped IP options from the header, * we need to adjust the start offset accordingly if this * packet had gone thru partial checksum offload. */ if ((m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PARTIAL)) == (CSUM_DATA_VALID | CSUM_PARTIAL)) { if (m->m_pkthdr.csum_rx_start >= (sizeof(struct ip) + olen)) { /* most common case */ m->m_pkthdr.csum_rx_start -= olen; } else { /* compute checksum in software instead */ m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID; m->m_pkthdr.csum_data = 0; ipstat.ips_adj_hwcsum_clr++; } } } u_char inetctlerrmap[PRC_NCMDS] = { 0, 0, 0, 0, 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, ENETUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, EMSGSIZE, EHOSTUNREACH, 0, 0, 0, 0, EHOSTUNREACH, 0, ENOPROTOOPT, ECONNREFUSED }; static int sysctl_ipforwarding SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int i, was_ipforwarding = ipforwarding; i = sysctl_handle_int(oidp, oidp->oid_arg1, oidp->oid_arg2, req); if (i != 0 || req->newptr == USER_ADDR_NULL) { return i; } if (was_ipforwarding && !ipforwarding) { /* clean up IPv4 forwarding cached routes */ ifnet_head_lock_shared(); for (i = 0; i <= if_index; i++) { struct ifnet *ifp = ifindex2ifnet[i]; if (ifp != NULL) { lck_mtx_lock(&ifp->if_cached_route_lock); ROUTE_RELEASE(&ifp->if_fwd_route); bzero(&ifp->if_fwd_route, sizeof(ifp->if_fwd_route)); lck_mtx_unlock(&ifp->if_cached_route_lock); } } ifnet_head_done(); } return 0; } /* * Similar to inp_route_{copyout,copyin} routines except that these copy * out the cached IPv4 forwarding route from struct ifnet instead of the * inpcb. See comments for those routines for explanations. */ static void ip_fwd_route_copyout(struct ifnet *ifp, struct route *dst) { struct route *src = &ifp->if_fwd_route; lck_mtx_lock_spin(&ifp->if_cached_route_lock); lck_mtx_convert_spin(&ifp->if_cached_route_lock); /* Minor sanity check */ if (src->ro_rt != NULL && rt_key(src->ro_rt)->sa_family != AF_INET) { panic("%s: wrong or corrupted route: %p", __func__, src); } route_copyout(dst, src, sizeof(*dst)); lck_mtx_unlock(&ifp->if_cached_route_lock); } static void ip_fwd_route_copyin(struct ifnet *ifp, struct route *src) { struct route *dst = &ifp->if_fwd_route; lck_mtx_lock_spin(&ifp->if_cached_route_lock); lck_mtx_convert_spin(&ifp->if_cached_route_lock); /* Minor sanity check */ if (src->ro_rt != NULL && rt_key(src->ro_rt)->sa_family != AF_INET) { panic("%s: wrong or corrupted route: %p", __func__, src); } if (ifp->if_fwd_cacheok) { route_copyin(src, dst, sizeof(*src)); } lck_mtx_unlock(&ifp->if_cached_route_lock); } /* * 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 sockaddr_in *next_hop) { #pragma unused(next_hop) struct ip *ip = mtod(m, struct ip *); struct sockaddr_in *sin; struct rtentry *rt; struct route fwd_rt; int error, type = 0, code = 0; struct mbuf *mcopy; n_long dest; struct in_addr pkt_dst; u_int32_t nextmtu = 0, len; struct ip_out_args ipoa; struct ifnet *rcvifp = m->m_pkthdr.rcvif; bzero(&ipoa, sizeof(ipoa)); ipoa.ipoa_boundif = IFSCOPE_NONE; ipoa.ipoa_sotc = SO_TC_UNSPEC; ipoa.ipoa_netsvctype = _NET_SERVICE_TYPE_UNSPEC; #if IPSEC struct secpolicy *sp = NULL; int ipsecerror; #endif /* IPSEC */ #if PF struct pf_mtag *pf_mtag; #endif /* PF */ dest = 0; pkt_dst = ip->ip_dst; #if DIAGNOSTIC if (ipprintfs) { printf("forward: src %lx dst %lx ttl %x\n", (u_int32_t)ip->ip_src.s_addr, (u_int32_t)pkt_dst.s_addr, ip->ip_ttl); } #endif if (m->m_flags & (M_BCAST | M_MCAST) || !in_canforward(pkt_dst)) { OSAddAtomic(1, &ipstat.ips_cantforward); m_freem(m); return; } #if IPSTEALTH if (!ipstealth) { #endif /* IPSTEALTH */ if (ip->ip_ttl <= IPTTLDEC) { icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); return; } #if IPSTEALTH } #endif /* IPSTEALTH */ #if PF pf_mtag = pf_find_mtag(m); if (pf_mtag != NULL && pf_mtag->pftag_rtableid != IFSCOPE_NONE) { ipoa.ipoa_boundif = pf_mtag->pftag_rtableid; ipoa.ipoa_flags |= IPOAF_BOUND_IF; } #endif /* PF */ ip_fwd_route_copyout(rcvifp, &fwd_rt); sin = SIN(&fwd_rt.ro_dst); if (ROUTE_UNUSABLE(&fwd_rt) || pkt_dst.s_addr != sin->sin_addr.s_addr) { ROUTE_RELEASE(&fwd_rt); sin->sin_family = AF_INET; sin->sin_len = sizeof(*sin); sin->sin_addr = pkt_dst; rtalloc_scoped_ign(&fwd_rt, RTF_PRCLONING, ipoa.ipoa_boundif); if (fwd_rt.ro_rt == NULL) { icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, dest, 0); goto done; } } rt = fwd_rt.ro_rt; /* * Save the IP header and at most 8 bytes of the payload, * in case we need to generate an ICMP message to the src. * * We don't use m_copy() because it might return a reference * to a shared cluster. Both this function and ip_output() * assume exclusive access to the IP header in `m', so any * data in a cluster may change before we reach icmp_error(). */ MGET(mcopy, M_DONTWAIT, m->m_type); if (mcopy != NULL) { M_COPY_PKTHDR(mcopy, m); mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8, (int)ip->ip_len); m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t)); } #if IPSTEALTH if (!ipstealth) { #endif /* IPSTEALTH */ ip->ip_ttl -= IPTTLDEC; #if IPSTEALTH } #endif /* IPSTEALTH */ /* * 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. */ RT_LOCK_SPIN(rt); if (rt->rt_ifp == m->m_pkthdr.rcvif && !(rt->rt_flags & (RTF_DYNAMIC | RTF_MODIFIED)) && satosin(rt_key(rt))->sin_addr.s_addr != INADDR_ANY && ipsendredirects && !srcrt && rt->rt_ifa != NULL) { struct in_ifaddr *ia = (struct in_ifaddr *)rt->rt_ifa; u_int32_t src = ntohl(ip->ip_src.s_addr); /* Become a regular mutex */ RT_CONVERT_LOCK(rt); IFA_LOCK_SPIN(&ia->ia_ifa); if ((src & ia->ia_subnetmask) == ia->ia_subnet) { if (rt->rt_flags & RTF_GATEWAY) { dest = satosin(rt->rt_gateway)->sin_addr.s_addr; } else { dest = pkt_dst.s_addr; } /* * Router requirements says to only send * host redirects. */ type = ICMP_REDIRECT; code = ICMP_REDIRECT_HOST; #if DIAGNOSTIC if (ipprintfs) { printf("redirect (%d) to %lx\n", code, (u_int32_t)dest); } #endif } IFA_UNLOCK(&ia->ia_ifa); } RT_UNLOCK(rt); /* Mark this packet as being forwarded from another interface */ m->m_pkthdr.pkt_flags |= PKTF_FORWARDED; len = m_pktlen(m); error = ip_output(m, NULL, &fwd_rt, IP_FORWARDING | IP_OUTARGS, NULL, &ipoa); /* Refresh rt since the route could have changed while in IP */ rt = fwd_rt.ro_rt; if (error != 0) { OSAddAtomic(1, &ipstat.ips_cantforward); } else { /* * Increment stats on the source interface; the ones * for destination interface has been taken care of * during output above by virtue of PKTF_FORWARDED. */ rcvifp->if_fpackets++; rcvifp->if_fbytes += len; OSAddAtomic(1, &ipstat.ips_forward); if (type != 0) { OSAddAtomic(1, &ipstat.ips_redirectsent); } else { if (mcopy != NULL) { /* * If we didn't have to go thru ipflow and * the packet was successfully consumed by * ip_output, the mcopy is rather a waste; * this could be further optimized. */ m_freem(mcopy); } goto done; } } if (mcopy == NULL) { goto done; } 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 == NULL) { break; } else { RT_LOCK_SPIN(rt); if (rt->rt_ifp != NULL) { nextmtu = rt->rt_ifp->if_mtu; } RT_UNLOCK(rt); } #ifdef IPSEC if (ipsec_bypass) { break; } /* * If the packet is routed over IPsec tunnel, tell the * originator the tunnel MTU. * tunnel MTU = if MTU - sizeof(IP) - ESP/AH hdrsiz * XXX quickhack!!! */ sp = ipsec4_getpolicybyaddr(mcopy, IPSEC_DIR_OUTBOUND, IP_FORWARDING, &ipsecerror); if (sp == NULL) { break; } /* * find the correct route for outer IPv4 * header, compute tunnel MTU. */ nextmtu = 0; if (sp->req != NULL && sp->req->saidx.mode == IPSEC_MODE_TUNNEL) { struct secasindex saidx; struct secasvar *sav; struct route *ro; struct ip *ipm; size_t ipsechdr; /* count IPsec header size */ ipsechdr = ipsec_hdrsiz(sp); ipm = mtod(mcopy, struct ip *); bcopy(&sp->req->saidx, &saidx, sizeof(saidx)); saidx.mode = sp->req->saidx.mode; saidx.reqid = sp->req->saidx.reqid; sin = SIN(&saidx.src); if (sin->sin_len == 0) { sin->sin_len = sizeof(*sin); sin->sin_family = AF_INET; sin->sin_port = IPSEC_PORT_ANY; bcopy(&ipm->ip_src, &sin->sin_addr, sizeof(sin->sin_addr)); } sin = SIN(&saidx.dst); if (sin->sin_len == 0) { sin->sin_len = sizeof(*sin); sin->sin_family = AF_INET; sin->sin_port = IPSEC_PORT_ANY; bcopy(&ipm->ip_dst, &sin->sin_addr, sizeof(sin->sin_addr)); } sav = key_allocsa_policy(&saidx); if (sav != NULL) { lck_mtx_lock(sadb_mutex); if (sav->sah != NULL) { ro = (struct route *)&sav->sah->sa_route; if (ro->ro_rt != NULL) { RT_LOCK(ro->ro_rt); if (ro->ro_rt->rt_ifp != NULL) { nextmtu = ro->ro_rt-> rt_ifp->if_mtu; nextmtu -= ipsechdr; } RT_UNLOCK(ro->ro_rt); } } key_freesav(sav, KEY_SADB_LOCKED); lck_mtx_unlock(sadb_mutex); } } key_freesp(sp, KEY_SADB_UNLOCKED); #endif /* IPSEC */ break; case ENOBUFS: /* * A router should not generate ICMP_SOURCEQUENCH as * required in RFC1812 Requirements for IP Version 4 Routers. * Source quench could be a big problem under DoS attacks, * or if the underlying interface is rate-limited. * Those who need source quench packets may re-enable them * via the net.inet.ip.sendsourcequench sysctl. */ if (ip_sendsourcequench == 0) { m_freem(mcopy); goto done; } else { type = ICMP_SOURCEQUENCH; code = 0; } break; case EACCES: m_freem(mcopy); goto done; } if (type == ICMP_UNREACH && code == ICMP_UNREACH_NEEDFRAG) { OSAddAtomic(1, &ipstat.ips_cantfrag); } icmp_error(mcopy, type, code, dest, nextmtu); done: ip_fwd_route_copyin(rcvifp, &fwd_rt); } int ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip, struct mbuf *m) { *mp = NULL; if (inp->inp_socket->so_options & SO_TIMESTAMP) { struct timeval tv; getmicrotime(&tv); mp = sbcreatecontrol_mbuf((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP, SOL_SOCKET, mp); if (*mp == NULL) { goto no_mbufs; } } if (inp->inp_socket->so_options & SO_TIMESTAMP_MONOTONIC) { uint64_t time; time = mach_absolute_time(); mp = sbcreatecontrol_mbuf((caddr_t)&time, sizeof(time), SCM_TIMESTAMP_MONOTONIC, SOL_SOCKET, mp); if (*mp == NULL) { goto no_mbufs; } } if (inp->inp_socket->so_options & SO_TIMESTAMP_CONTINUOUS) { uint64_t time; time = mach_continuous_time(); mp = sbcreatecontrol_mbuf((caddr_t)&time, sizeof(time), SCM_TIMESTAMP_CONTINUOUS, SOL_SOCKET, mp); if (*mp == NULL) { goto no_mbufs; } } if (inp->inp_socket->so_flags & SOF_RECV_TRAFFIC_CLASS) { int tc = m_get_traffic_class(m); mp = sbcreatecontrol_mbuf((caddr_t)&tc, sizeof(tc), SO_TRAFFIC_CLASS, SOL_SOCKET, mp); if (*mp == NULL) { goto no_mbufs; } } if ((inp->inp_socket->so_flags & SOF_RECV_WAKE_PKT) && (m->m_pkthdr.pkt_flags & PKTF_WAKE_PKT)) { int flag = 1; mp = sbcreatecontrol_mbuf((caddr_t)&flag, sizeof(flag), SO_RECV_WAKE_PKT, SOL_SOCKET, mp); if (*mp == NULL) { goto no_mbufs; } } if (inp->inp_flags & INP_RECVDSTADDR || SOFLOW_ENABLED(inp->inp_socket)) { mp = sbcreatecontrol_mbuf((caddr_t)&ip->ip_dst, sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP, mp); if (*mp == NULL) { goto no_mbufs; } } #ifdef notyet /* * XXX * Moving these out of udp_input() made them even more broken * than they already were. */ /* options were tossed already */ if (inp->inp_flags & INP_RECVOPTS) { mp = sbcreatecontrol_mbuf((caddr_t)opts_deleted_above, sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, mp); if (*mp == NULL) { goto no_mbufs; } } /* ip_srcroute doesn't do what we want here, need to fix */ if (inp->inp_flags & INP_RECVRETOPTS) { mp = sbcreatecontrol_mbuf((caddr_t)ip_srcroute(), sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP, mp); if (*mp == NULL) { goto no_mbufs; } } #endif /* notyet */ if (inp->inp_flags & INP_RECVIF) { struct ifnet *ifp; uint8_t sdlbuf[SOCK_MAXADDRLEN + 1]; struct sockaddr_dl *sdl2 = SDL(&sdlbuf); /* * Make sure to accomodate the largest possible * size of SA(if_lladdr)->sa_len. */ _CASSERT(sizeof(sdlbuf) == (SOCK_MAXADDRLEN + 1)); ifnet_head_lock_shared(); if ((ifp = m->m_pkthdr.rcvif) != NULL && ifp->if_index && (ifp->if_index <= if_index)) { struct ifaddr *ifa = ifnet_addrs[ifp->if_index - 1]; struct sockaddr_dl *sdp; if (!ifa || !ifa->ifa_addr) { goto makedummy; } IFA_LOCK_SPIN(ifa); sdp = SDL(ifa->ifa_addr); /* * Change our mind and don't try copy. */ if (sdp->sdl_family != AF_LINK) { IFA_UNLOCK(ifa); goto makedummy; } /* the above _CASSERT ensures sdl_len fits in sdlbuf */ bcopy(sdp, sdl2, sdp->sdl_len); IFA_UNLOCK(ifa); } else { makedummy: sdl2->sdl_len = offsetof(struct sockaddr_dl, sdl_data[0]); sdl2->sdl_family = AF_LINK; sdl2->sdl_index = 0; sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0; } ifnet_head_done(); mp = sbcreatecontrol_mbuf((caddr_t)sdl2, sdl2->sdl_len, IP_RECVIF, IPPROTO_IP, mp); if (*mp == NULL) { goto no_mbufs; } } if (inp->inp_flags & INP_RECVTTL) { mp = sbcreatecontrol_mbuf((caddr_t)&ip->ip_ttl, sizeof(ip->ip_ttl), IP_RECVTTL, IPPROTO_IP, mp); if (*mp == NULL) { goto no_mbufs; } } if (inp->inp_flags & INP_PKTINFO) { struct in_pktinfo pi; bzero(&pi, sizeof(struct in_pktinfo)); bcopy(&ip->ip_dst, &pi.ipi_addr, sizeof(struct in_addr)); pi.ipi_ifindex = (m != NULL && m->m_pkthdr.rcvif != NULL) ? m->m_pkthdr.rcvif->if_index : 0; mp = sbcreatecontrol_mbuf((caddr_t)&pi, sizeof(struct in_pktinfo), IP_RECVPKTINFO, IPPROTO_IP, mp); if (*mp == NULL) { goto no_mbufs; } } if (inp->inp_flags & INP_RECVTOS) { mp = sbcreatecontrol_mbuf((caddr_t)&ip->ip_tos, sizeof(u_char), IP_RECVTOS, IPPROTO_IP, mp); if (*mp == NULL) { goto no_mbufs; } } return 0; no_mbufs: ipstat.ips_pktdropcntrl++; return ENOBUFS; } static inline u_short ip_cksum(struct mbuf *m, int hlen) { u_short sum; if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); } else if (!(m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) && !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) { /* * The packet arrived on an interface which isn't capable * of performing IP header checksum; compute it now. */ sum = ip_cksum_hdr_in(m, hlen); } else { sum = 0; m->m_pkthdr.csum_flags |= (CSUM_DATA_VALID | CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID); m->m_pkthdr.csum_data = 0xffff; } if (sum != 0) { OSAddAtomic(1, &ipstat.ips_badsum); } return sum; } static int ip_getstat SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg1, arg2) if (req->oldptr == USER_ADDR_NULL) { req->oldlen = (size_t)sizeof(struct ipstat); } return SYSCTL_OUT(req, &ipstat, MIN(sizeof(ipstat), req->oldlen)); } void ip_setsrcifaddr_info(struct mbuf *m, uint16_t src_idx, struct in_ifaddr *ia) { 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 (ia != NULL) { m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; m->m_pkthdr.src_ifindex = ia->ia_ifp->if_index; } else { m->m_pkthdr.src_ifindex = src_idx; if (src_idx != 0) { m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; } } } void ip_setdstifaddr_info(struct mbuf *m, uint16_t dst_idx, struct in_ifaddr *ia) { 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 (ia != NULL) { m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; m->m_pkthdr.dst_ifindex = ia->ia_ifp->if_index; } else { m->m_pkthdr.dst_ifindex = dst_idx; if (dst_idx != 0) { m->m_pkthdr.pkt_flags |= PKTF_IFAINFO; } } } int ip_getsrcifaddr_info(struct mbuf *m, uint32_t *src_idx, uint32_t *iaf) { 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 (iaf != NULL) { *iaf = 0; } return 0; } int ip_getdstifaddr_info(struct mbuf *m, uint32_t *dst_idx, uint32_t *iaf) { 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 (iaf != NULL) { *iaf = 0; } return 0; } /* * Protocol input handler for IPPROTO_GRE. */ void gre_input(struct mbuf *m, int off) { gre_input_func_t fn = gre_input_func; /* * If there is a registered GRE input handler, pass mbuf to it. */ if (fn != NULL) { lck_mtx_unlock(inet_domain_mutex); m = fn(m, off, (mtod(m, struct ip *))->ip_p); lck_mtx_lock(inet_domain_mutex); } /* * If no matching tunnel that is up is found, we inject * the mbuf to raw ip socket to see if anyone picks it up. */ if (m != NULL) { rip_input(m, off); } } /* * Private KPI for PPP/PPTP. */ int ip_gre_register_input(gre_input_func_t fn) { lck_mtx_lock(inet_domain_mutex); gre_input_func = fn; lck_mtx_unlock(inet_domain_mutex); return 0; } #if (DEBUG || DEVELOPMENT) static int sysctl_reset_ip_input_stats SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error, i; i = ip_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 (ip_input_measure != i && i == 1) { net_perf_initialize(&net_perf, ip_input_measure_bins); } ip_input_measure = i; done: return error; } static int sysctl_ip_input_measure_bins SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error; uint64_t i; i = ip_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; } ip_input_measure_bins = i; done: return error; } static int sysctl_ip_input_getperf SYSCTL_HANDLER_ARGS { #pragma unused(oidp, arg1, arg2) if (req->oldptr == USER_ADDR_NULL) { req->oldlen = (size_t)sizeof(struct ipstat); } return SYSCTL_OUT(req, &net_perf, MIN(sizeof(net_perf), req->oldlen)); } #endif /* (DEBUG || DEVELOPMENT) */ static int sysctl_ip_checkinterface SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error, i; i = ip_checkinterface; error = sysctl_handle_int(oidp, &i, 0, req); if (error != 0 || req->newptr == USER_ADDR_NULL) { return error; } switch (i) { case IP_CHECKINTERFACE_WEAK_ES: case IP_CHECKINTERFACE_HYBRID_ES: case IP_CHECKINTERFACE_STRONG_ES: if (ip_checkinterface != i) { ip_checkinterface = i; os_log(OS_LOG_DEFAULT, "%s: ip_checkinterface is now %d\n", __func__, ip_checkinterface); } break; default: error = EINVAL; break; } return error; } |