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4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263 4264 4265 4266 4267 4268 4269 4270 4271 4272 4273 4274 4275 4276 4277 4278 4279 4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341 4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355 4356 4357 4358 4359 4360 4361 4362 4363 4364 4365 4366 4367 4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406 4407 4408 4409 4410 4411 | /* * Copyright (c) 2000-2015 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> #if PF #include <net/pfvar.h> #endif /* PF */ #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/ip_fw.h> #include <netinet/ip_divert.h> #include <netinet/kpi_ipfilter_var.h> #include <netinet/udp.h> #include <netinet/udp_var.h> #include <netinet/bootp.h> #include <netinet/lro_ext.h> #if DUMMYNET #include <netinet/ip_dummynet.h> #endif /* DUMMYNET */ #if CONFIG_MACF_NET #include <security/mac_framework.h> #endif /* CONFIG_MACF_NET */ #if IPSEC #include <netinet6/ipsec.h> #include <netkey/key.h> #endif /* IPSEC */ #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; extern lck_mtx_t *sadb_mutex; lck_grp_t *sadb_stat_mutex_grp; lck_grp_attr_t *sadb_stat_mutex_grp_attr; lck_attr_t *sadb_stat_mutex_attr; decl_lck_mtx_data(, sadb_stat_mutex_data); lck_mtx_t *sadb_stat_mutex = &sadb_stat_mutex_data; #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 *, u_int32_t, int, int, struct ip_fw_in_args *, int); decl_lck_mtx_data(static, ipqlock); static lck_attr_t *ipqlock_attr; static lck_grp_t *ipqlock_grp; static lck_grp_attr_t *ipqlock_grp_attr; /* 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; 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; 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"); int ip_doscopedroute = 1; SYSCTL_INT(_net_inet_ip, OID_AUTO, scopedroute, CTLFLAG_RD | CTLFLAG_LOCKED, &ip_doscopedroute, 0, "Enable IPv4 scoped routing"); 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"); /* * XXX - Setting ip_checkinterface mostly implements the receive side of * the Strong ES model described in RFC 1122, but since the routing table * and transmit implementation do not implement the Strong ES model, * setting this to 1 results in an odd hybrid. * * XXX - ip_checkinterface currently must be disabled if you use ipnat * to translate the destination address to another local interface. * * XXX - ip_checkinterface must be disabled if you add IP aliases * to the loopback interface instead of the interface where the * packets for those addresses are received. */ static int ip_checkinterface = 0; SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_checkinterface, 0, "Verify packet arrives on correct interface"); 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"); 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)"); #if DIAGNOSTIC static int ipprintfs = 0; #endif struct protosw *ip_protox[IPPROTO_MAX]; static lck_grp_attr_t *in_ifaddr_rwlock_grp_attr; static lck_grp_t *in_ifaddr_rwlock_grp; static lck_attr_t *in_ifaddr_rwlock_attr; decl_lck_rw_data(, in_ifaddr_rwlock_data); lck_rw_t *in_ifaddr_rwlock = &in_ifaddr_rwlock_data; /* 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 */ /* Firewall hooks */ #if IPFIREWALL ip_fw_chk_t *ip_fw_chk_ptr; int fw_enable = 1; int fw_bypass = 1; int fw_one_pass = 0; #endif /* IPFIREWALL */ #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 *); #if IPDIVERT #ifdef IPDIVERT_44 static struct mbuf *ip_reass(struct mbuf *, u_int32_t *, u_int16_t *); #else /* !IPDIVERT_44 */ static struct mbuf *ip_reass(struct mbuf *, u_int16_t *, u_int16_t *); #endif /* !IPDIVERT_44 */ #else /* !IPDIVERT */ static struct mbuf *ip_reass(struct mbuf *); #endif /* !IPDIVERT */ 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); int ip_use_randomid = 1; SYSCTL_INT(_net_inet_ip, OID_AUTO, random_id, CTLFLAG_RW | CTLFLAG_LOCKED, &ip_use_randomid, 0, "Randomize IP packets IDs"); /* * 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__ */ /* * GRE input handler function, settable via ip_gre_register_input() for PPTP. */ static gre_input_func_t gre_input_func; /* * 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; PE_parse_boot_argn("net.inet.ip.scopedroute", &ip_doscopedroute, sizeof (ip_doscopedroute)); in_ifaddr_init(); in_ifaddr_rwlock_grp_attr = lck_grp_attr_alloc_init(); in_ifaddr_rwlock_grp = lck_grp_alloc_init("in_ifaddr_rwlock", in_ifaddr_rwlock_grp_attr); in_ifaddr_rwlock_attr = lck_attr_alloc_init(); lck_rw_init(in_ifaddr_rwlock, in_ifaddr_rwlock_grp, in_ifaddr_rwlock_attr); 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]\n", __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; } } /* IP fragment reassembly queue lock */ ipqlock_grp_attr = lck_grp_attr_alloc_init(); ipqlock_grp = lck_grp_alloc_init("ipqlock", ipqlock_grp_attr); ipqlock_attr = lck_attr_alloc_init(); lck_mtx_init(&ipqlock, ipqlock_grp, ipqlock_attr); 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 = RandomULong() ^ tv.tv_usec; ip_initid(); ipf_init(); #if IPSEC sadb_stat_mutex_grp_attr = lck_grp_attr_alloc_init(); sadb_stat_mutex_grp = lck_grp_alloc_init("sadb_stat", sadb_stat_mutex_grp_attr); sadb_stat_mutex_attr = lck_attr_alloc_init(); lck_mtx_init(sadb_stat_mutex, sadb_stat_mutex_grp, sadb_stat_mutex_attr); #endif arp_init(); } /* * 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); } void ip_proto_dispatch_in_wrapper(struct mbuf *m, int hlen, u_int8_t proto) { ip_proto_dispatch_in(m, hlen, proto, 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 + 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); /* * 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 */ ip = mtod(m, struct ip *); if (changed_header) { ip->ip_len = ntohs(ip->ip_len) - hlen; ip->ip_off = ntohs(ip->ip_off); } 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(ntohs(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, 0, tbl[i].pkte_npkts, tbl[i].pkte_nbytes, args, 0); if (tbl[i].pkte_npkts > 2) ipstat.ips_rxc_chainsz_gt2++; if (tbl[i].pkte_npkts > 4) ipstat.ips_rxc_chainsz_gt4++; if (ip_input_measure) net_perf_histogram(&net_perf, tbl[i].pkte_npkts); 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_next_hop = args->fwai_next_hop; args1->fwa_ipfw_rule = args->fwai_ipfw_rule; args1->fwa_pf_rule = args->fwai_pf_rule; args1->fwa_divert_rule = args->fwai_divert_rule; } static void ip_input_cpin_args(struct ip_fw_args *args1, struct ip_fw_in_args *args) { args->fwai_next_hop = args1->fwa_next_hop; args->fwai_ipfw_rule = args1->fwa_ipfw_rule; args->fwai_pf_rule = args1->fwa_pf_rule; args->fwai_divert_rule = args1->fwa_divert_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) { nxt_mbuf = mbuf_nextpkt(tmp_mbuf); mbuf_setnextpkt(tmp_mbuf, NULL); if ((sw_lro) && (ip->ip_p == IPPROTO_TCP)) tmp_mbuf = tcp_lro(tmp_mbuf, hlen); if (tmp_mbuf) 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, uint32_t ifindex, struct in_ifaddr *ia) { struct mbuf *tmp_mbuf = m; while (tmp_mbuf) { ip_setdstifaddr_info(tmp_mbuf, ifindex, ia); tmp_mbuf = mbuf_nextpkt(tmp_mbuf); } } /* * 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. * div_info is packet divert/tee info */ static ipinput_chain_ret_t ip_input_first_pass(struct mbuf *m, u_int32_t *div_info, struct ip_fw_in_args *args, int *ours, 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 IPFIREWALL int i; #endif #if IPFIREWALL || DUMMYNET struct m_tag *copy; struct m_tag *p; boolean_t delete = FALSE; struct ip_fw_args args1; boolean_t init = FALSE; #endif ipfilter_t inject_filter_ref = NULL; #if !IPFIREWALL #pragma unused (args) #endif #if !IPDIVERT #pragma unused (div_info) #pragma unused (ours) #endif #if !IPFIREWALL_FORWARD #pragma unused (ours) #endif /* 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 IPFIREWALL || 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 DUMMYNET 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_ipfw_rule = dn_tag->dn_ipfw_rule; args->fwai_pf_rule = dn_tag->dn_pf_rule; delete = TRUE; } #endif #if IPDIVERT if (p->m_tag_type == KERNEL_TAG_TYPE_DIVERT) { struct divert_tag *div_tag; div_tag = (struct divert_tag *)(p+1); args->fwai_divert_rule = div_tag->cookie; delete = TRUE; } #endif if (p->m_tag_type == KERNEL_TAG_TYPE_IPFORWARD) { struct ip_fwd_tag *ipfwd_tag; ipfwd_tag = (struct ip_fwd_tag *)(p+1); args->fwai_next_hop = ipfwd_tag->next_hop; 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 DUMMYNET if (args->fwai_ipfw_rule || 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 IPFIREWALL if (args->fwai_ipfw_rule) goto iphack; #endif /* IPFIREWALL */ if (args->fwai_pf_rule) goto check_with_pf; } #endif /* DUMMYNET */ ipfw_tags_done: #endif /* IPFIREWALL || 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) - hlen; ip->ip_off = ntohs(ip->ip_off); ip_proto_dispatch_in(m, hlen, ip->ip_p, inject_filter_ref); return (IPINPUT_DONE); } 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) { /* * 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++; } 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); } /* for consistency */ m->m_pkthdr.pkt_proto = ip->ip_p; /* for netstat route statistics */ src_ip = ip->ip_src; len = m->m_pkthdr.len; #if DUMMYNET check_with_pf: #endif #if PF /* Invoke inbound packet filter */ if (PF_IS_ENABLED) { int error; ip_input_cpout_args(args, &args1, &init); #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\n", __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 IPFIREWALL #if DUMMYNET iphack: #endif /* DUMMYNET */ /* * Check if we want to allow this packet to be processed. * Consider it to be bad if not. */ if (fw_enable && IPFW_LOADED) { #if IPFIREWALL_FORWARD /* * If we've been forwarded from the output side, then * skip the firewall a second time */ if (args->fwai_next_hop) { *ours = 1; return (IPINPUT_DONTCHAIN); } #endif /* IPFIREWALL_FORWARD */ ip_input_cpout_args(args, &args1, &init); args1.fwa_m = m; i = ip_fw_chk_ptr(&args1); m = args1.fwa_m; if ((i & IP_FW_PORT_DENY_FLAG) || m == NULL) { /* drop */ if (m) m_freem(m); 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 *); /* just in case m changed */ *modm = m; ip_input_cpin_args(&args1, args); if (i == 0 && args->fwai_next_hop == NULL) { /* common case */ goto pass; } #if DUMMYNET if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG) != 0) { /* Send packet to the appropriate pipe */ ip_dn_io_ptr(m, i&0xffff, DN_TO_IP_IN, &args1, DN_CLIENT_IPFW); 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); } #endif /* DUMMYNET */ #if IPDIVERT if (i != 0 && (i & IP_FW_PORT_DYNT_FLAG) == 0) { /* Divert or tee packet */ *div_info = i; *ours = 1; return (IPINPUT_DONTCHAIN); } #endif #if IPFIREWALL_FORWARD if (i == 0 && args->fwai_next_hop != NULL) { retval = IPINPUT_DONTCHAIN; goto pass; } #endif /* * if we get here, the packet must be dropped */ ip_input_update_nstat(inifp, src_ip, 1, len); KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); OSAddAtomic(1, &ipstat.ips_total); return (IPINPUT_FREED); } #endif /* IPFIREWALL */ #if IPSEC | IPFIREWALL 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 IPFIREWALL if (hlen > sizeof (struct ip) && ip_dooptions(m, 0, args->fwai_next_hop)) { #else /* !IPFIREWALL */ if (hlen > sizeof (struct ip) && ip_dooptions(m, 0, NULL)) { #endif /* !IPFIREWALL */ 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 as the process of determining * if it is our fragment or someone else's plus the complexity of * divert and fw args makes it harder to do chaining. */ 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 } static void ip_input_second_pass(struct mbuf *m, struct ifnet *inifp, u_int32_t div_info, int npkts_in_chain, int bytes_in_chain, struct ip_fw_in_args *args, int ours) { unsigned int checkif; struct mbuf *tmp_mbuf = NULL; struct in_ifaddr *ia = NULL; struct in_addr pkt_dst; unsigned int hlen; #if !IPFIREWALL #pragma unused (args) #endif #if !IPDIVERT #pragma unused (div_info) #endif 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); if (ours) goto ours; /* * 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) { 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; } /* * Cache the destination address of the packet; this may be * changed by use of 'ipfw fwd'. */ #if IPFIREWALL pkt_dst = args->fwai_next_hop == NULL ? ip->ip_dst : args->fwai_next_hop->sin_addr; #else /* !IPFIREWALL */ pkt_dst = ip->ip_dst; #endif /* !IPFIREWALL */ /* * 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. */ checkif = ip_checkinterface && (ipforwarding == 0) && !(inifp->if_flags & IFF_LOOPBACK) && !(m->m_pkthdr.pkt_flags & PKTF_LOOP) #if IPFIREWALL && (args->fwai_next_hop == NULL); #else /* !IPFIREWALL */ ; #endif /* !IPFIREWALL */ /* * Check for exact addresses in the hash bucket. */ lck_rw_lock_shared(in_ifaddr_rwlock); TAILQ_FOREACH(ia, INADDR_HASH(pkt_dst.s_addr), ia_hash) { /* * If the address matches, verify that the packet * arrived via the correct interface if checking is * enabled. */ if (IA_SIN(ia)->sin_addr.s_addr == pkt_dst.s_addr && (!checkif || ia->ia_ifp == inifp)) { ip_input_setdst_chain(m, 0, ia); lck_rw_done(in_ifaddr_rwlock); goto ours; } } lck_rw_done(in_ifaddr_rwlock); /* * 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(). */ if (inifp->if_flags & IFF_BROADCAST) { 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 == pkt_dst.s_addr || ia->ia_netbroadcast.s_addr == pkt_dst.s_addr) { ip_input_setdst_chain(m, 0, ia); ifnet_lock_done(inifp); goto ours; } } ifnet_lock_done(inifp); } if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 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; } 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); goto ours; } if (ip->ip_p == IPPROTO_UDP) { struct udpiphdr *ui; ui = mtod(m, struct udpiphdr *); if (ntohs(ui->ui_dport) == IPPORT_BOOTPC) { goto ours; } } tmp_mbuf = m; struct mbuf *nxt_mbuf = NULL; while (tmp_mbuf) { 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 { #if IPFIREWALL ip_forward(tmp_mbuf, 0, args->fwai_next_hop); #else ip_forward(tmp_mbuf, 0, NULL); #endif } tmp_mbuf = nxt_mbuf; } KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); return; ours: /* * If offset or IP_MF are set, must reassemble. */ if (ip->ip_off & ~(IP_DF | IP_RF)) { VERIFY(npkts_in_chain == 1); /* * ip_reass() will return a different mbuf, and update * the divert info in div_info and args->fwai_divert_rule. */ #if IPDIVERT m = ip_reass(m, (u_int16_t *)&div_info, &args->fwai_divert_rule); #else m = ip_reass(m); #endif 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; #if IPDIVERT /* Restore original checksum before diverting packet */ if (div_info != 0) { VERIFY(npkts_in_chain == 1); #if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); #endif ip->ip_sum = 0; ip->ip_sum = ip_cksum_hdr_in(m, hlen); #if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_off); NTOHS(ip->ip_len); #endif } #endif } /* * Further protocols expect the packet length to be w/o the * IP header. */ ip->ip_len -= hlen; #if IPDIVERT /* * Divert or tee packet to the divert protocol if required. * * If div_info is zero then cookie should be too, so we shouldn't * need to clear them here. Assume divert_packet() does so also. */ if (div_info != 0) { struct mbuf *clone = NULL; VERIFY(npkts_in_chain == 1); /* Clone packet if we're doing a 'tee' */ if (div_info & IP_FW_PORT_TEE_FLAG) clone = m_dup(m, M_DONTWAIT); /* Restore packet header fields to original values */ ip->ip_len += hlen; #if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); #endif /* Deliver packet to divert input routine */ OSAddAtomic(1, &ipstat.ips_delivered); divert_packet(m, 1, div_info & 0xffff, args->fwai_divert_rule); /* If 'tee', continue with original packet */ if (clone == NULL) { return; } m = clone; ip = mtod(m, struct ip *); } #endif #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); #if IPFIREWALL if (args->fwai_next_hop && ip->ip_p == IPPROTO_TCP) { /* TCP needs IPFORWARD info if available */ struct m_tag *fwd_tag; struct ip_fwd_tag *ipfwd_tag; VERIFY(npkts_in_chain == 1); fwd_tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFORWARD, sizeof (*ipfwd_tag), M_NOWAIT, m); if (fwd_tag == NULL) goto bad; ipfwd_tag = (struct ip_fwd_tag *)(fwd_tag+1); ipfwd_tag->next_hop = args->fwai_next_hop; m_tag_prepend(m, fwd_tag); KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr, ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); /* TCP deals with its own locking */ ip_proto_dispatch_in(m, hlen, ip->ip_p, 0); } else { KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr, ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); ip_input_dispatch_chain(m); } #else /* !IPFIREWALL */ ip_input_dispatch_chain(m); #endif /* !IPFIREWALL */ 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; u_int32_t div_info = 0; int ours = 0; struct timeval start_tv; int num_pkts = 0; int chain = 0; struct ip_fw_in_args args; if (ip_chaining == 0) { struct mbuf *m = packet_list; if (ip_input_measure) net_perf_start_time(&net_perf, &start_tv); while (m) { packet_list = mbuf_nextpkt(m); mbuf_setnextpkt(m, NULL); ip_input(m); m = packet_list; num_pkts++; } if (ip_input_measure) net_perf_measure_time(&net_perf, &start_tv, num_pkts); return; } if (ip_input_measure) net_perf_start_time(&net_perf, &start_tv); bzero(&pktchain_tbl, sizeof(pktchain_tbl)); restart_list_process: chain = 0; for (packet = packet_list; packet; packet = packet_list) { packet_list = mbuf_nextpkt(packet); mbuf_setnextpkt(packet, NULL); num_pkts++; modm = NULL; div_info = 0; bzero(&args, sizeof (args)); retval = ip_input_first_pass(packet, &div_info, &args, &ours, &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 (ip_input_measure) net_perf_histogram(&net_perf, 1); ip_input_second_pass(packet, packet->m_pkthdr.rcvif, div_info, 1, packet->m_pkthdr.len, &args, ours); } if (packet_list) goto restart_list_process; if (ip_input_measure) net_perf_measure_time(&net_perf, &start_tv, num_pkts); } /* * 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; struct in_ifaddr *ia = NULL; unsigned int hlen, checkif; u_short sum = 0; struct in_addr pkt_dst; #if IPFIREWALL int i; u_int32_t div_info = 0; /* packet divert/tee info */ #endif #if IPFIREWALL || 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); 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 IPFIREWALL || 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 DUMMYNET if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) { struct dn_pkt_tag *dn_tag; dn_tag = (struct dn_pkt_tag *)(tag+1); args.fwa_ipfw_rule = dn_tag->dn_ipfw_rule; args.fwa_pf_rule = dn_tag->dn_pf_rule; m_tag_delete(m, tag); } #endif /* DUMMYNET */ #if IPDIVERT if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_DIVERT, NULL)) != NULL) { struct divert_tag *div_tag; div_tag = (struct divert_tag *)(tag+1); args.fwa_divert_rule = div_tag->cookie; m_tag_delete(m, tag); } #endif if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFORWARD, NULL)) != NULL) { struct ip_fwd_tag *ipfwd_tag; ipfwd_tag = (struct ip_fwd_tag *)(tag+1); args.fwa_next_hop = ipfwd_tag->next_hop; m_tag_delete(m, tag); } #if DIAGNOSTIC if (m == NULL || !(m->m_flags & M_PKTHDR)) panic("ip_input no HDR"); #endif #if DUMMYNET if (args.fwa_ipfw_rule || 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 IPFIREWALL if (args.fwa_ipfw_rule) goto iphack; #endif /* IPFIREWALL */ if (args.fwa_pf_rule) goto check_with_pf; } #endif /* DUMMYNET */ ipfw_tags_done: #endif /* IPFIREWALL || 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) - hlen; ip->ip_off = ntohs(ip->ip_off); ip_proto_dispatch_in(m, hlen, ip->ip_p, inject_filter_ref); return; } 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) { /* * 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++; } 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); } /* for consistency */ m->m_pkthdr.pkt_proto = ip->ip_p; #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\n", __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 #if IPFIREWALL #if DUMMYNET iphack: #endif /* DUMMYNET */ /* * Check if we want to allow this packet to be processed. * Consider it to be bad if not. */ if (fw_enable && IPFW_LOADED) { #if IPFIREWALL_FORWARD /* * If we've been forwarded from the output side, then * skip the firewall a second time */ if (args.fwa_next_hop) goto ours; #endif /* IPFIREWALL_FORWARD */ args.fwa_m = m; i = ip_fw_chk_ptr(&args); m = args.fwa_m; if ((i & IP_FW_PORT_DENY_FLAG) || m == NULL) { /* drop */ if (m) m_freem(m); return; } ip = mtod(m, struct ip *); /* just in case m changed */ if (i == 0 && args.fwa_next_hop == NULL) { /* common case */ goto pass; } #if DUMMYNET if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG) != 0) { /* Send packet to the appropriate pipe */ ip_dn_io_ptr(m, i&0xffff, DN_TO_IP_IN, &args, DN_CLIENT_IPFW); return; } #endif /* DUMMYNET */ #if IPDIVERT if (i != 0 && (i & IP_FW_PORT_DYNT_FLAG) == 0) { /* Divert or tee packet */ div_info = i; goto ours; } #endif #if IPFIREWALL_FORWARD if (i == 0 && args.fwa_next_hop != NULL) { goto pass; } #endif /* * if we get here, the packet must be dropped */ m_freem(m); return; } #endif /* IPFIREWALL */ #if IPSEC | IPFIREWALL 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 IPFIREWALL if (hlen > sizeof (struct ip) && ip_dooptions(m, 0, args.fwa_next_hop)) { #else /* !IPFIREWALL */ if (hlen > sizeof (struct ip) && ip_dooptions(m, 0, NULL)) { #endif /* !IPFIREWALL */ 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; } /* * Cache the destination address of the packet; this may be * changed by use of 'ipfw fwd'. */ #if IPFIREWALL pkt_dst = args.fwa_next_hop == NULL ? ip->ip_dst : args.fwa_next_hop->sin_addr; #else /* !IPFIREWALL */ pkt_dst = ip->ip_dst; #endif /* !IPFIREWALL */ /* * 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. */ checkif = ip_checkinterface && (ipforwarding == 0) && !(inifp->if_flags & IFF_LOOPBACK) && !(m->m_pkthdr.pkt_flags & PKTF_LOOP) #if IPFIREWALL && (args.fwa_next_hop == NULL); #else /* !IPFIREWALL */ ; #endif /* !IPFIREWALL */ /* * Check for exact addresses in the hash bucket. */ lck_rw_lock_shared(in_ifaddr_rwlock); TAILQ_FOREACH(ia, INADDR_HASH(pkt_dst.s_addr), ia_hash) { /* * If the address matches, verify that the packet * arrived via the correct interface if checking is * enabled. */ if (IA_SIN(ia)->sin_addr.s_addr == pkt_dst.s_addr && (!checkif || ia->ia_ifp == inifp)) { ip_setdstifaddr_info(m, 0, ia); lck_rw_done(in_ifaddr_rwlock); goto ours; } } lck_rw_done(in_ifaddr_rwlock); /* * 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(). */ if (inifp->if_flags & IFF_BROADCAST) { 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 == pkt_dst.s_addr || ia->ia_netbroadcast.s_addr == pkt_dst.s_addr) { ip_setdstifaddr_info(m, 0, ia); ifnet_lock_done(inifp); goto ours; } } ifnet_lock_done(inifp); } if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { 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; } if (ip->ip_dst.s_addr == (u_int32_t)INADDR_BROADCAST || ip->ip_dst.s_addr == INADDR_ANY) { ip_setdstifaddr_info(m, inifp->if_index, NULL); goto ours; } /* 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); return; } ui = mtod(m, struct udpiphdr *); if (ntohs(ui->ui_dport) == IPPORT_BOOTPC) { ip_setdstifaddr_info(m, inifp->if_index, NULL); goto ours; } ip = mtod(m, struct ip *); /* in case it changed */ } /* * Not for us; forward if possible and desirable. */ if (ipforwarding == 0) { OSAddAtomic(1, &ipstat.ips_cantforward); m_freem(m); } else { #if IPFIREWALL ip_forward(m, 0, args.fwa_next_hop); #else ip_forward(m, 0, NULL); #endif } return; ours: /* * If offset or IP_MF are set, must reassemble. */ if (ip->ip_off & ~(IP_DF | IP_RF)) { /* * ip_reass() will return a different mbuf, and update * the divert info in div_info and args.fwa_divert_rule. */ #if IPDIVERT m = ip_reass(m, (u_int16_t *)&div_info, &args.fwa_divert_rule); #else m = ip_reass(m); #endif 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; #if IPDIVERT /* Restore original checksum before diverting packet */ if (div_info != 0) { #if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); #endif ip->ip_sum = 0; ip->ip_sum = ip_cksum_hdr_in(m, hlen); #if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_off); NTOHS(ip->ip_len); #endif } #endif } /* * Further protocols expect the packet length to be w/o the * IP header. */ ip->ip_len -= hlen; #if IPDIVERT /* * Divert or tee packet to the divert protocol if required. * * If div_info is zero then cookie should be too, so we shouldn't * need to clear them here. Assume divert_packet() does so also. */ if (div_info != 0) { struct mbuf *clone = NULL; /* Clone packet if we're doing a 'tee' */ if (div_info & IP_FW_PORT_TEE_FLAG) clone = m_dup(m, M_DONTWAIT); /* Restore packet header fields to original values */ ip->ip_len += hlen; #if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); #endif /* Deliver packet to divert input routine */ OSAddAtomic(1, &ipstat.ips_delivered); divert_packet(m, 1, div_info & 0xffff, args.fwa_divert_rule); /* If 'tee', continue with original packet */ if (clone == NULL) { return; } m = clone; ip = mtod(m, struct ip *); } #endif #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); #if IPFIREWALL if (args.fwa_next_hop && ip->ip_p == IPPROTO_TCP) { /* TCP needs IPFORWARD info if available */ struct m_tag *fwd_tag; struct ip_fwd_tag *ipfwd_tag; fwd_tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFORWARD, sizeof (*ipfwd_tag), M_NOWAIT, m); if (fwd_tag == NULL) goto bad; ipfwd_tag = (struct ip_fwd_tag *)(fwd_tag+1); ipfwd_tag->next_hop = args.fwa_next_hop; m_tag_prepend(m, fwd_tag); KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr, ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); /* TCP deals with its own locking */ ip_proto_dispatch_in(m, hlen, ip->ip_p, 0); } else { KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr, ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); if ((sw_lro) && (ip->ip_p == IPPROTO_TCP)) { m = tcp_lro(m, hlen); if (m == NULL) return; } ip_proto_dispatch_in(m, hlen, ip->ip_p, 0); } #else /* !IPFIREWALL */ if ((sw_lro) && (ip->ip_p == IPPROTO_TCP)) { m = tcp_lro(m, hlen); if (m == NULL) return; } ip_proto_dispatch_in(m, hlen, ip->ip_p, 0); #endif /* !IPFIREWALL */ 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. * * When IPDIVERT enabled, keep additional state with each packet that * tells us if we need to divert or tee the packet we're building. * * The IP header is *NOT* adjusted out of iplen. */ static struct mbuf * #if IPDIVERT ip_reass(struct mbuf *m, #ifdef IPDIVERT_44 u_int32_t *divinfo, #else /* IPDIVERT_44 */ u_int16_t *divinfo, #endif /* IPDIVERT_44 */ u_int16_t *divcookie) #else /* IPDIVERT */ ip_reass(struct mbuf *m) #endif /* IPDIVERT */ { 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 && #if CONFIG_MACF_NET mac_ipq_label_compare(m, fp) && #endif 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 or excludes the IP header span, as the * sum for those octets would already be 0xffff and thus no-op. */ 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; start = m->m_pkthdr.csum_rx_start; csum = m->m_pkthdr.csum_rx_val; if (start != 0 && start != hlen) { #if BYTE_ORDER != BIG_ENDIAN if (start < hlen) { HTONS(ip->ip_len); HTONS(ip->ip_off); } #endif /* callee folds in sum */ csum = m_adj_sum16(m, start, hlen, csum); #if BYTE_ORDER != BIG_ENDIAN if (start < hlen) { NTOHS(ip->ip_off); NTOHS(ip->ip_len); } #endif } csum_flags = m->m_pkthdr.csum_flags; } 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; #if CONFIG_MACF_NET if (mac_ipq_label_init(fp, M_NOWAIT) != 0) { ipq_free(fp); fp = NULL; goto dropfrag; } mac_ipq_label_associate(m, fp); #endif 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; } #if IPDIVERT /* * Transfer firewall instructions to the fragment structure. * Only trust info in the fragment at offset 0. */ if (ip->ip_off == 0) { #ifdef IPDIVERT_44 fp->ipq_div_info = *divinfo; #else fp->ipq_divert = *divinfo; #endif fp->ipq_div_cookie = *divcookie; } *divinfo = 0; *divcookie = 0; #endif /* IPDIVERT */ m = NULL; /* nothing to return */ goto done; } else { fp->ipq_nfrags++; #if CONFIG_MACF_NET mac_ipq_label_update(m, fp); #endif } #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; #if IPDIVERT /* * Transfer firewall instructions to the fragment structure. * Only trust info in the fragment at offset 0. */ if (ip->ip_off == 0) { #ifdef IPDIVERT_44 fp->ipq_div_info = *divinfo; #else fp->ipq_divert = *divinfo; #endif fp->ipq_div_cookie = *divcookie; } *divinfo = 0; *divcookie = 0; #endif /* IPDIVERT */ /* * 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 = 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_PARTIAL; m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID; } #if IPDIVERT /* * Extract firewall instructions from the fragment structure. */ #ifdef IPDIVERT_44 *divinfo = fp->ipq_div_info; #else *divinfo = fp->ipq_divert; #endif *divcookie = fp->ipq_div_cookie; #endif /* IPDIVERT */ #if CONFIG_MACF_NET mac_mbuf_label_associate_ipq(fp, m); mac_ipq_label_destroy(fp); #endif /* * Create header for new ip packet by modifying header of first * packet; dequeue and discard fragment reassembly header. * Make header visible. */ ip->ip_len = (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: #if IPDIVERT *divinfo = 0; *divcookie = 0; #endif /* IPDIVERT */ 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, code, type = ICMP_PARAMPROB, forward = 0; struct in_addr *sin, dst; u_int32_t ntime; struct sockaddr_in ipaddr = { sizeof (ipaddr), AF_INET, 0, { 0 }, { 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 = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } optlen = cp[IPOPT_OLEN]; if (optlen < IPOPT_OLEN + sizeof (*cp) || optlen > cnt) { code = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } } switch (opt) { default: break; /* * Source routing with record. * Find interface with current destination address. * If none on this machine then drop if strictly routed, * or do nothing if loosely routed. * Record interface address and bring up next address * component. If strictly routed make sure next * address is on directly accessible net. */ case IPOPT_LSRR: case IPOPT_SSRR: if (optlen < IPOPT_OFFSET + sizeof (*cp)) { code = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { code = &cp[IPOPT_OFFSET] - (u_char *)ip; goto bad; } ipaddr.sin_addr = ip->ip_dst; 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 = &cp[IPOPT_OFFSET] - (u_char *)ip; goto bad; } if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) { code = &cp[IPOPT_OFFSET] - (u_char *)ip; goto bad; } /* * If no space remains, ignore. */ off--; /* 0 origin */ if (off > 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 = cp - (u_char *)ip; ipt = (struct ip_timestamp *)(void *)cp; if (ipt->ipt_len < 4 || ipt->ipt_len > 40) { code = (u_char *)&ipt->ipt_len - (u_char *)ip; goto bad; } if (ipt->ipt_ptr < 5) { code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; goto bad; } if (ipt->ipt_ptr > ipt->ipt_len - (int)sizeof (int32_t)) { if (++ipt->ipt_oflw == 0) { code = (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 = (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 = (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 = (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. * Second argument is buffer to which options * will be moved, and return value is their length. * XXX should be deleted; last arg currently ignored. */ void ip_stripoptions(struct mbuf *m, struct mbuf *mopt) { #pragma unused(mopt) 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); 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); } u_char inetctlerrmap[PRC_NCMDS] = { 0, 0, 0, 0, 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, ENETUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, EMSGSIZE, EHOSTUNREACH, 0, 0, 0, 0, 0, 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) { #if !IPFIREWALL #pragma unused(next_hop) #endif 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 = { IFSCOPE_NONE, { 0 }, 0, 0 }; struct ifnet *rcvifp = m->m_pkthdr.rcvif; #if IPSEC struct secpolicy *sp = NULL; int ipsecerror; #endif /* IPSEC */ #if PF struct pf_mtag *pf_mtag; #endif /* PF */ dest = 0; #if IPFIREWALL /* * Cache the destination address of the packet; this may be * changed by use of 'ipfw fwd'. */ pkt_dst = ((next_hop != NULL) ? next_hop->sin_addr : ip->ip_dst); #else /* !IPFIREWALL */ pkt_dst = ip->ip_dst; #endif /* !IPFIREWALL */ #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); #if IPFIREWALL if (next_hop != NULL) { /* Pass IPFORWARD info if available */ struct m_tag *tag; struct ip_fwd_tag *ipfwd_tag; tag = m_tag_create(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFORWARD, sizeof (*ipfwd_tag), M_NOWAIT, m); if (tag == NULL) { error = ENOBUFS; m_freem(m); goto done; } ipfwd_tag = (struct ip_fwd_tag *)(tag+1); ipfwd_tag->next_hop = next_hop; m_tag_prepend(m, tag); } #endif /* IPFIREWALL */ /* 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; int 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 = &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: /* ipfw denied packet */ 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_flags & INP_RECVDSTADDR) { 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_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_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; } } 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, uint32_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, uint32_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); } 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))); } |