X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/d7e50217d7adf6e52786a38bcaa4cd698cb9a79e..3903760236c30e3b5ace7a4eefac3a269d68957c:/bsd/netinet/ip_input.c diff --git a/bsd/netinet/ip_input.c b/bsd/netinet/ip_input.c index bd5edb4fb..35d7a9f20 100644 --- a/bsd/netinet/ip_input.c +++ b/bsd/netinet/ip_input.c @@ -1,17 +1,20 @@ /* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2016 Apple Inc. All rights reserved. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * @APPLE_LICENSE_HEADER_START@ - * - * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. - * * 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. Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ and read it before using this - * file. - * + * 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, @@ -19,8 +22,8 @@ * 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_LICENSE_HEADER_END@ + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1982, 1986, 1988, 1993 @@ -55,7 +58,12 @@ * SUCH DAMAGE. * * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 - * $FreeBSD: src/sys/netinet/ip_input.c,v 1.130.2.25 2001/08/29 21:41:37 jesper Exp $ + */ +/* + * 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 @@ -71,91 +79,166 @@ #include #include #include +#include +#include +#include +#include +#include + +#include +#include #include +#include +#include + +#include #include #include #include #include -#include +#include +#include +#include +#include +#include +#include +#if PF +#include +#endif /* PF */ #include #include #include +#include #include #include #include #include -#include - #include - -/* needed for AUTOCONFIGURING: */ +#include +#include #include #include #include +#include -#include - -#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 DUMMYNET +#include +#endif /* DUMMYNET */ +#if CONFIG_MACF_NET +#include +#endif /* CONFIG_MACF_NET */ #if IPSEC #include #include -#endif - -#include "faith.h" -#if defined(NFAITH) && NFAITH > 0 -#include -#endif +#endif /* IPSEC */ -#if DUMMYNET -#include -#endif +#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 0) +#define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 2) +#define DBG_FNC_IP_INPUT NETDBG_CODE(DBG_NETIP, (2 << 8)) #if IPSEC extern int ipsec_bypass; -#endif +extern lck_mtx_t *sadb_mutex; -int rsvp_on = 0; -static int ip_rsvp_on; -struct socket *ip_rsvpd; +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 */ -int ipforwarding = 0; -SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_RW, - &ipforwarding, 0, "Enable IP forwarding between interfaces"); +MBUFQ_HEAD(fq_head); -static int ipsendredirects = 1; /* XXX */ -SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW, - &ipsendredirects, 0, "Enable sending IP redirects"); +static int frag_timeout_run; /* frag timer is scheduled to run */ +static void frag_timeout(void *); +static void frag_sched_timeout(void); -int ip_defttl = IPDEFTTL; -SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW, - &ip_defttl, 0, "Maximum TTL on IP packets"); +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); -static int ip_dosourceroute = 0; -SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, CTLFLAG_RW, - &ip_dosourceroute, 0, "Enable forwarding source routed IP packets"); +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; -static int ip_acceptsourceroute = 0; -SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute, - CTLFLAG_RW, &ip_acceptsourceroute, 0, - "Enable accepting source routed IP packets"); - -static int ip_keepfaith = 0; -SYSCTL_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW, - &ip_keepfaith, 0, - "Enable packet capture for FAITH IPv4->IPv6 translater daemon"); +/* 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) -static int ip_nfragpackets = 0; -static int ip_maxfragpackets; /* initialized in ip_init() */ -SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragpackets, CTLFLAG_RW, - &ip_maxfragpackets, 0, - "Maximum number of IPv4 fragment reassembly queue entries"); +/* IP fragment reassembly queues (protected by ipqlock) */ +static TAILQ_HEAD(ipqhead, ipq) ipq[IPREASS_NHASH]; /* ip reassembly queues */ +static int maxnipq; /* max packets in reass queues */ +static u_int32_t maxfragsperpacket; /* max frags/packet in reass queues */ +static u_int32_t nipq; /* # of packets in reass queues */ +static u_int32_t ipq_limit; /* ipq allocation limit */ +static u_int32_t ipq_count; /* current # of allocated ipq's */ + +static int sysctl_ipforwarding SYSCTL_HANDLER_ARGS; +static int sysctl_maxnipq SYSCTL_HANDLER_ARGS; +static int sysctl_maxfragsperpacket SYSCTL_HANDLER_ARGS; + +#if (DEBUG || DEVELOPMENT) +static int sysctl_reset_ip_input_stats SYSCTL_HANDLER_ARGS; +static int sysctl_ip_input_measure_bins SYSCTL_HANDLER_ARGS; +static int sysctl_ip_input_getperf SYSCTL_HANDLER_ARGS; +#endif /* (DEBUG || DEVELOPMENT) */ + +int ipforwarding = 0; +SYSCTL_PROC(_net_inet_ip, IPCTL_FORWARDING, forwarding, + CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ipforwarding, 0, + sysctl_ipforwarding, "I", "Enable IP forwarding between interfaces"); + +static int ipsendredirects = 1; /* XXX */ +SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, + CTLFLAG_RW | CTLFLAG_LOCKED, &ipsendredirects, 0, + "Enable sending IP redirects"); + +int ip_defttl = IPDEFTTL; +SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW | CTLFLAG_LOCKED, + &ip_defttl, 0, "Maximum TTL on IP packets"); + +static int ip_dosourceroute = 0; +SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute, + CTLFLAG_RW | CTLFLAG_LOCKED, &ip_dosourceroute, 0, + "Enable forwarding source routed IP packets"); + +static int ip_acceptsourceroute = 0; +SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute, + CTLFLAG_RW | CTLFLAG_LOCKED, &ip_acceptsourceroute, 0, + "Enable accepting source routed IP packets"); + +static int ip_sendsourcequench = 0; +SYSCTL_INT(_net_inet_ip, OID_AUTO, sendsourcequench, + CTLFLAG_RW | CTLFLAG_LOCKED, &ip_sendsourcequench, 0, + "Enable the transmission of source quench packets"); + +SYSCTL_PROC(_net_inet_ip, OID_AUTO, maxfragpackets, + CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &maxnipq, 0, sysctl_maxnipq, + "I", "Maximum number of IPv4 fragment reassembly queue entries"); + +SYSCTL_UINT(_net_inet_ip, OID_AUTO, fragpackets, CTLFLAG_RD | CTLFLAG_LOCKED, + &nipq, 0, "Current number of IPv4 fragment reassembly queue entries"); + +SYSCTL_PROC(_net_inet_ip, OID_AUTO, maxfragsperpacket, + CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &maxfragsperpacket, 0, + sysctl_maxfragsperpacket, "I", + "Maximum number of IPv4 fragments allowed per packet"); + +static uint32_t ip_adj_clear_hwcksum = 0; +SYSCTL_UINT(_net_inet_ip, OID_AUTO, adj_clear_hwcksum, + CTLFLAG_RW | CTLFLAG_LOCKED, &ip_adj_clear_hwcksum, 0, + "Invalidate hwcksum info when adjusting length"); /* * XXX - Setting ip_checkinterface mostly implements the receive side of @@ -170,77 +253,102 @@ SYSCTL_INT(_net_inet_ip, OID_AUTO, maxfragpackets, CTLFLAG_RW, * 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, - &ip_checkinterface, 0, "Verify packet arrives on correct interface"); +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"); + +#if (DEBUG || DEVELOPMENT) +static int ip_input_measure = 0; +SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf, + CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, + &ip_input_measure, 0, sysctl_reset_ip_input_stats, "I", "Do time measurement"); + +static uint64_t ip_input_measure_bins = 0; +SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf_bins, + CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &ip_input_measure_bins, 0, + sysctl_ip_input_measure_bins, "I", + "bins for chaining performance data histogram"); + +static net_perf_t net_perf; +SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf_data, + CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, + 0, 0, sysctl_ip_input_getperf, "S,net_perf", + "IP input performance data (struct net_perf, net/net_perf.h)"); +#endif /* (DEBUG || DEVELOPMENT) */ #if DIAGNOSTIC -static int ipprintfs = 0; +static int ipprintfs = 0; #endif -extern struct domain inetdomain; -extern struct protosw inetsw[]; struct protosw *ip_protox[IPPROTO_MAX]; -static int ipqmaxlen = IFQ_MAXLEN; -struct in_ifaddrhead in_ifaddrhead; /* first inet address */ -struct ifqueue ipintrq; -SYSCTL_INT(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen, CTLFLAG_RW, - &ipintrq.ifq_maxlen, 0, "Maximum size of the IP input queue"); -SYSCTL_INT(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, CTLFLAG_RD, - &ipintrq.ifq_drops, 0, "Number of packets dropped from the IP input queue"); -struct ipstat ipstat; -SYSCTL_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RD, - &ipstat, ipstat, "IP statistics (struct ipstat, netinet/ip_var.h)"); +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; -/* 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) +/* Protected by in_ifaddr_rwlock */ +struct in_ifaddrhead in_ifaddrhead; /* first inet address */ +struct in_ifaddrhashhead *in_ifaddrhashtbl; /* inet addr hash table */ -static struct ipq ipq[IPREASS_NHASH]; -static int nipq = 0; /* total # of reass queues */ -static int maxnipq; -const int ipintrq_present = 1; +#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, - &ip_mtu, 0, "Default MTU"); -#endif +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, - &ipstealth, 0, ""); -#endif - +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; -ip_fw_ctl_t *ip_fw_ctl_ptr; -int fw_enable = 1 ; +int fw_enable = 1; +int fw_bypass = 1; +int fw_one_pass = 0; +#endif /* IPFIREWALL */ #if DUMMYNET -ip_dn_ctl_t *ip_dn_ctl_ptr; -#endif +ip_dn_io_t *ip_dn_io_ptr; +#endif /* DUMMYNET */ -int (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **)) = NULL; - -SYSCTL_NODE(_net_inet_ip, OID_AUTO, linklocal, CTLFLAG_RW, 0, "link local"); +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, - &ip_linklocal_stat, ip_linklocal_stat, - "Number of link local packets with TTL less than 255"); +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, 0, "link local input"); +SYSCTL_NODE(_net_inet_ip_linklocal, OID_AUTO, in, + CTLFLAG_RW | CTLFLAG_LOCKED, 0, "link local input"); -int ip_linklocal_in_allowbadttl = 0; -SYSCTL_INT(_net_inet_ip_linklocal_in, OID_AUTO, allowbadttl, CTLFLAG_RW, - &ip_linklocal_in_allowbadttl, 0, - "Allow incoming link local packets with TTL less than 255"); +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"); /* @@ -255,226 +363,750 @@ 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)]; + struct in_addr route[MAX_IPOPTLEN / sizeof (struct in_addr)]; } ip_srcrt; -struct sockaddr_in *ip_fw_fwd_addr; - -#ifdef __APPLE__ -extern struct mbuf* m_dup(register struct mbuf *m, int how); -#endif - -static void save_rte __P((u_char *, struct in_addr)); -static int ip_dooptions __P((struct mbuf *)); -static void ip_forward __P((struct mbuf *, int)); -static void ip_freef __P((struct ipq *)); +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 __P((struct mbuf *, - struct ipq *, struct ipq *, u_int32_t *, u_int16_t *)); -#else -static struct mbuf *ip_reass __P((struct mbuf *, - struct ipq *, struct ipq *, u_int16_t *, u_int16_t *)); -#endif -#else -static struct mbuf *ip_reass __P((struct mbuf *, struct ipq *, struct ipq *)); -#endif -static struct in_ifaddr *ip_rtaddr __P((struct in_addr)); -void ipintr __P((void)); +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"); -#if RANDOM_IP_ID -extern u_short ip_id; -#endif +/* + * 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; + +static void +ip_init_delayed(void) +{ + struct ifreq ifr; + int error; + struct sockaddr_in *sin; + + bzero(&ifr, sizeof(ifr)); + strlcpy(ifr.ifr_name, "lo0", sizeof(ifr.ifr_name)); + sin = (struct sockaddr_in *)(void *)&ifr.ifr_addr; + sin->sin_len = sizeof(struct sockaddr_in); + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = htonl(INADDR_LOOPBACK); + error = in_control(NULL, SIOCSIFADDR, (caddr_t)&ifr, lo_ifp, kernproc); + if (error) + printf("%s: failed to initialise lo0's address, error=%d\n", + __func__, error); +} /* * IP initialization: fill in IP protocol switch table. * All protocols not implemented in kernel go to raw IP protocol handler. */ void -ip_init() +ip_init(struct protosw *pp, struct domain *dp) { - register struct protosw *pr; - register int i; - static ip_initialized = 0; - - if (!ip_initialized) - { - TAILQ_INIT(&in_ifaddrhead); - pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW); - if (pr == 0) - panic("ip_init"); - for (i = 0; i < IPPROTO_MAX; i++) - ip_protox[i] = pr; - for (pr = inetdomain.dom_protosw; pr; pr = pr->pr_next) - { if(!((unsigned int)pr->pr_domain)) continue; /* If uninitialized, skip */ - if (pr->pr_domain->dom_family == PF_INET && - pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) + static int ip_initialized = 0; + struct protosw *pr; + struct timeval tv; + int i; + + domain_proto_mtx_lock_assert_held(); + VERIFY((pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED); + + /* ipq_alloc() uses mbufs for IP fragment queue structures */ + _CASSERT(sizeof (struct ipq) <= _MLEN); + + /* + * Some ioctls (e.g. SIOCAIFADDR) use ifaliasreq struct, which is + * interchangeable with in_aliasreq; they must have the same size. + */ + _CASSERT(sizeof (struct ifaliasreq) == sizeof (struct in_aliasreq)); + + if (ip_initialized) + return; + ip_initialized = 1; + + in_ifaddr_init(); + + 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; } - for (i = 0; i < IPREASS_NHASH; i++) - ipq[i].next = ipq[i].prev = &ipq[i]; + } + + /* 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); - maxnipq = nmbclusters / 4; - ip_maxfragpackets = nmbclusters / 4; + 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); -#if RANDOM_IP_ID - ip_id = time_second & 0xffff; #endif - ipintrq.ifq_maxlen = ipqmaxlen; - ip_initialized = 1; + arp_init(); + net_init_add(ip_init_delayed); +} + +/* + * Initialize IPv4 source address hash table. + */ +static void +in_ifaddrhashtbl_init(void) +{ + int i, k, p; + + if (in_ifaddrhashtbl != NULL) + return; + + PE_parse_boot_argn("inaddr_nhash", &inaddr_nhash, + sizeof (inaddr_nhash)); + if (inaddr_nhash == 0) + inaddr_nhash = INADDR_NHASH; + + MALLOC(in_ifaddrhashtbl, struct in_ifaddrhashhead *, + inaddr_nhash * sizeof (*in_ifaddrhashtbl), + M_IFADDR, M_WAITOK | M_ZERO); + if (in_ifaddrhashtbl == NULL) + panic("in_ifaddrhashtbl_init allocation failed"); + + /* + * Generate the next largest prime greater than inaddr_nhash. + */ + k = (inaddr_nhash % 2 == 0) ? inaddr_nhash + 1 : inaddr_nhash + 2; + for (;;) { + p = 1; + for (i = 3; i * i <= k; i += 2) { + if (k % i == 0) + p = 0; + } + if (p == 1) + break; + k += 2; } + inaddr_hashp = k; +} + +u_int32_t +inaddr_hashval(u_int32_t key) +{ + /* + * The hash index is the computed prime times the key modulo + * the hash size, as documented in "Introduction to Algorithms" + * (Cormen, Leiserson, Rivest). + */ + if (inaddr_nhash > 1) + return ((key * inaddr_hashp) % inaddr_nhash); + else + return (0); } -/* Initialize the PF_INET domain, and add in the pre-defined protos */ void -in_dinit() -{ register int i; - register struct protosw *pr; - register struct domain *dp; - static inetdomain_initted = 0; - extern int in_proto_count; - - if (!inetdomain_initted) - { - kprintf("Initing %d protosw entries\n", in_proto_count); - dp = &inetdomain; - - for (i=0, pr = &inetsw[0]; iipf_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 (DEBUG || DEVELOPMENT) + if (ip_input_measure) + net_perf_histogram(&net_perf, tbl[i].pkte_npkts); +#endif /* (DEBUG || DEVELOPMENT) */ + tbl[i].pkte_head = tbl[i].pkte_tail = NULL; + tbl[i].pkte_npkts = 0; + tbl[i].pkte_nbytes = 0; + /* no need to initialize address and protocol in tbl */ + } + } +} + +static void +ip_input_cpout_args(struct ip_fw_in_args *args, struct ip_fw_args *args1, + boolean_t *done_init) +{ + if (*done_init == FALSE) { + bzero(args1, sizeof(struct ip_fw_args)); + *done_init = TRUE; + } + args1->fwa_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 struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET }; -static struct route ipforward_rt; +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); + } +} /* - * Ip input routine. Checksum and byte swap header. If fragmented - * try to reassemble. Process options. Pass to next level. + * 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 */ -void -ip_input(struct mbuf *m) +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 ipq *fp; - struct in_ifaddr *ia = NULL; - int i, hlen, mff, checkif; - u_short sum; - u_int16_t divert_cookie; /* firewall cookie */ - struct in_addr pkt_dst; -#if IPDIVERT - u_int32_t divert_info = 0; /* packet divert/tee info */ + 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 - struct ip_fw_chain *rule = NULL; + ipfilter_t inject_filter_ref = NULL; -#if IPDIVERT - /* Get and reset firewall cookie */ - divert_cookie = ip_divert_cookie; - ip_divert_cookie = 0; -#else - divert_cookie = 0; +#if !IPFIREWALL +#pragma unused (args) #endif -#if IPFIREWALL && DUMMYNET - /* - * dummynet packet are prepended a vestigial mbuf with - * m_type = MT_DUMMYNET and m_data pointing to the matching - * rule. - */ - if (m->m_type == MT_DUMMYNET) { - rule = (struct ip_fw_chain *)(m->m_data) ; - m = m->m_next ; - ip = mtod(m, struct ip *); - hlen = IP_VHL_HL(ip->ip_vhl) << 2; - goto iphack ; - } else - rule = NULL ; +#if !IPDIVERT +#pragma unused (div_info) +#pragma unused (ours) #endif -#if DIAGNOSTIC - if (m == NULL || (m->m_flags & M_PKTHDR) == 0) +#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 - ipstat.ips_total++; - if (m->m_pkthdr.len < sizeof(struct ip)) - goto tooshort; +#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))) == 0) { - ipstat.ips_toosmall++; - return; + (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); + 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) { - ipstat.ips_badvers++; - goto bad; + 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)) { /* minimum header length */ - ipstat.ips_badhlen++; - goto bad; + 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)) == 0) { - ipstat.ips_badhlen++; - return; + 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) { - if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) { -#ifndef __APPLE__ - ipstat.ips_badaddr++; -#endif - goto bad; + /* + * 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 */ - if ((IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) || + /* 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) { - ip_linklocal_stat.iplls_in_badttl++; + OSAddAtomic(1, &ip_linklocal_stat.iplls_in_badttl); /* Silently drop link local traffic with bad TTL */ - if (ip_linklocal_in_allowbadttl != 0) - goto bad; + 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 (m->m_pkthdr.rcvif->if_hwassist == 0) - m->m_pkthdr.csum_flags = 0; - - if ((m->m_pkthdr.csum_flags & CSUM_TCP_SUM16) && ip->ip_p != IPPROTO_TCP) - m->m_pkthdr.csum_flags = 0; - if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { - sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID); - } else { - sum = in_cksum(m, hlen); - } - if (sum) { - ipstat.ips_badsum++; - goto bad; + 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) { - ipstat.ips_badlen++; - goto bad; + 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 @@ -483,15 +1115,30 @@ ip_input(struct mbuf *m) * Drop packet if shorter than we expect. */ if (m->m_pkthdr.len < ip->ip_len) { -tooshort: - ipstat.ips_tooshort++; - goto bad; + 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 hwcksuming */ - m->m_pkthdr.csum_flags = 0; - m->m_pkthdr.csum_data = 0; + /* + * 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; @@ -499,77 +1146,983 @@ tooshort: 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)) + if (ipsec_bypass == 0 && ipsec_gethist(m, NULL)) { + retval = IPINPUT_DONTCHAIN; /* XXX scope for chaining here? */ goto pass; + } #endif - /* - * IpHack's section. - * Right now when no processing on packet has done - * and it is still fresh out of network we do our black - * deals with it. - * - Firewall: deny/allow/divert - * - Xlate: translate packet's addr/port (NAT). - * - Pipe: pass pkt through dummynet. - * - Wrap: fake packet's addr/port - * - Encapsulate: put it in another IP and send out. - */ - -#if defined(IPFIREWALL) && defined(DUMMYNET) +#if IPFIREWALL +#if DUMMYNET iphack: -#endif +#endif /* DUMMYNET */ /* * Check if we want to allow this packet to be processed. * Consider it to be bad if not. */ - if (fr_checkp) { - struct mbuf *m1 = m; + 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 ((*fr_checkp)(ip, hlen, m->m_pkthdr.rcvif, 0, &m1) || !m1) + 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; - ip = mtod(m = m1, struct ip *); + } + m = clone; + ip = mtod(m, struct ip *); } - if (fw_enable && ip_fw_chk_ptr) { +#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; +#if (DEBUG || DEVELOPMENT) + struct timeval start_tv; +#endif /* (DEBUG || DEVELOPMENT) */ + int num_pkts = 0; + int chain = 0; + struct ip_fw_in_args args; + + if (ip_chaining == 0) { + struct mbuf *m = packet_list; +#if (DEBUG || DEVELOPMENT) + if (ip_input_measure) + net_perf_start_time(&net_perf, &start_tv); +#endif /* (DEBUG || DEVELOPMENT) */ + + while (m) { + packet_list = mbuf_nextpkt(m); + mbuf_setnextpkt(m, NULL); + ip_input(m); + m = packet_list; + num_pkts++; + } +#if (DEBUG || DEVELOPMENT) + if (ip_input_measure) + net_perf_measure_time(&net_perf, &start_tv, num_pkts); +#endif /* (DEBUG || DEVELOPMENT) */ + return; + } +#if (DEBUG || DEVELOPMENT) + if (ip_input_measure) + net_perf_start_time(&net_perf, &start_tv); +#endif /* (DEBUG || DEVELOPMENT) */ + + bzero(&pktchain_tbl, sizeof(pktchain_tbl)); +restart_list_process: + chain = 0; + for (packet = packet_list; packet; packet = packet_list) { + 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 (DEBUG || DEVELOPMENT) + if (ip_input_measure) + net_perf_histogram(&net_perf, 1); +#endif /* (DEBUG || DEVELOPMENT) */ + 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 (DEBUG || DEVELOPMENT) + if (ip_input_measure) + net_perf_measure_time(&net_perf, &start_tv, num_pkts); +#endif /* (DEBUG || DEVELOPMENT) */ +} +/* + * Ip input routine. Checksum and byte swap header. If fragmented + * try to reassemble. Process options. Pass to next level. + */ +void +ip_input(struct mbuf *m) +{ + struct ip *ip; + 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 (ip_fw_fwd_addr) + if (args.fwa_next_hop) goto ours; #endif /* IPFIREWALL_FORWARD */ - /* - * See the comment in ip_output for the return values - * produced by the firewall. - */ - i = (*ip_fw_chk_ptr)(&ip, - hlen, NULL, &divert_cookie, &m, &rule, &ip_fw_fwd_addr); - if ( (i & IP_FW_PORT_DENY_FLAG) || m == NULL) { /* drop */ - if (m) - m_freem(m); + + 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 && ip_fw_fwd_addr == NULL) /* common case */ + + if (i == 0 && args.fwa_next_hop == NULL) { /* common case */ goto pass; + } #if DUMMYNET - if ((i & IP_FW_PORT_DYNT_FLAG) != 0) { - /* send packet to the appropriate pipe */ - dummynet_io(i&0xffff,DN_TO_IP_IN,m,NULL,NULL,0, rule); + 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 +#endif /* DUMMYNET */ #if IPDIVERT if (i != 0 && (i & IP_FW_PORT_DYNT_FLAG) == 0) { /* Divert or tee packet */ - divert_info = i; + div_info = i; goto ours; } #endif #if IPFIREWALL_FORWARD - if (i == 0 && ip_fw_fwd_addr != NULL) + if (i == 0 && args.fwa_next_hop != NULL) { goto pass; + } #endif /* * if we get here, the packet must be dropped @@ -577,8 +2130,10 @@ iphack: 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 @@ -586,38 +2141,36 @@ pass: * to be sent and the original packet to be freed). */ ip_nhops = 0; /* for source routed packets */ - if (hlen > sizeof (struct ip) && ip_dooptions(m)) { -#if IPFIREWALL_FORWARD - ip_fw_fwd_addr = NULL; -#endif +#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; } - /* greedy RSVP, snatches any PATH packet of the RSVP protocol and no - * matter if it is destined to another node, or whether it is - * a multicast one, RSVP wants it! and prevents it from being forwarded - * anywhere else. Also checks if the rsvp daemon is running before - * grabbing the packet. - */ - if (rsvp_on && ip->ip_p==IPPROTO_RSVP) - 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). */ - if (TAILQ_EMPTY(&in_ifaddrhead) && - (m->m_flags & (M_MCAST|M_BCAST)) == 0) + 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'. */ - pkt_dst = ip_fw_fwd_addr == NULL ? - ip->ip_dst : ip_fw_fwd_addr->sin_addr; +#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 @@ -633,282 +2186,190 @@ pass: * to the loopback interface instead of the interface where * the packets are received. */ - checkif = ip_checkinterface && (ipforwarding == 0) && - ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) && - (ip_fw_fwd_addr == NULL); + 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 */ - TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { -#define satosin(sa) ((struct sockaddr_in *)(sa)) - - if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) - goto ours; - + /* + * 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 == m->m_pkthdr.rcvif)) + 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; - /* - * Only accept broadcast packets that arrive via the - * matching interface. Reception of forwarded directed - * broadcasts would be handled via ip_forward() and - * ether_output() with the loopback into the stack for - * SIMPLEX interfaces handled by ether_output(). - */ - if (ia->ia_ifp == m->m_pkthdr.rcvif && - ia->ia_ifp && ia->ia_ifp->if_flags & IFF_BROADCAST) { + } + } + 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) - goto ours; - if (ia->ia_netbroadcast.s_addr == pkt_dst.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; - if (ip_mrouter) { - /* - * If we are acting as a multicast router, all - * incoming multicast packets are passed to the - * kernel-level multicast forwarding function. - * The packet is returned (relatively) intact; if - * ip_mforward() returns a non-zero value, the packet - * must be discarded, else it may be accepted below. - */ - if (ip_mforward(ip, m->m_pkthdr.rcvif, m, 0) != 0) { - ipstat.ips_cantforward++; - m_freem(m); - return; - } - - /* - * The process-level routing demon needs to receive - * all multicast IGMP packets, whether or not this - * host belongs to their destination groups. - */ - if (ip->ip_p == IPPROTO_IGMP) - goto ours; - ipstat.ips_forward++; - } /* * See if we belong to the destination multicast group on the * arrival interface. */ - IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm); + in_multihead_lock_shared(); + IN_LOOKUP_MULTI(&ip->ip_dst, inifp, inm); + in_multihead_lock_done(); if (inm == NULL) { - ipstat.ips_notmember++; + 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_long)INADDR_BROADCAST) - goto ours; - if (ip->ip_dst.s_addr == INADDR_ANY) + 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 (m->m_pkthdr.rcvif != NULL - && (m->m_pkthdr.rcvif->if_eflags & IFEF_AUTOCONFIGURING) - && hlen == sizeof(struct ip) - && ip->ip_p == IPPROTO_UDP) { + 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))) == 0) { - udpstat.udps_hdrops++; + + 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 */ } -#if defined(NFAITH) && 0 < NFAITH - /* - * FAITH(Firewall Aided Internet Translator) - */ - if (m->m_pkthdr.rcvif && m->m_pkthdr.rcvif->if_type == IFT_FAITH) { - if (ip_keepfaith) { - if (ip->ip_p == IPPROTO_TCP || ip->ip_p == IPPROTO_ICMP) - goto ours; - } - m_freem(m); - return; - } -#endif /* * Not for us; forward if possible and desirable. */ if (ipforwarding == 0) { - ipstat.ips_cantforward++; + OSAddAtomic(1, &ipstat.ips_cantforward); m_freem(m); - } else - ip_forward(m, 0); -#if IPFIREWALL_FORWARD - ip_fw_fwd_addr = NULL; + } else { +#if IPFIREWALL + ip_forward(m, 0, args.fwa_next_hop); +#else + ip_forward(m, 0, NULL); #endif + } return; ours: -#ifndef __APPLE__ - /* Darwin does not have an if_data in ifaddr */ - /* Count the packet in the ip address stats */ - if (ia != NULL) { - ia->ia_ifa.if_ipackets++; - ia->ia_ifa.if_ibytes += m->m_pkthdr.len; - } -#endif - /* * If offset or IP_MF are set, must reassemble. - * Otherwise, nothing need be done. - * (We could look in the reassembly queue to see - * if the packet was previously fragmented, - * but it's not worth the time; just let them time out.) - */ - if (ip->ip_off & (IP_MF | IP_OFFMASK | IP_RF)) { - -#if 0 /* - * Reassembly should be able to treat a mbuf cluster, for later - * operation of contiguous protocol headers on the cluster. (KAME) */ - if (m->m_flags & M_EXT) { /* XXX */ - if ((m = m_pullup(m, hlen)) == 0) { - ipstat.ips_toosmall++; -#if IPFIREWALL_FORWARD - ip_fw_fwd_addr = NULL; -#endif - return; - } - ip = mtod(m, struct ip *); - } -#endif - sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id); - /* - * Look for queue of fragments - * of this datagram. - */ - for (fp = ipq[sum].next; fp != &ipq[sum]; fp = fp->next) - if (ip->ip_id == fp->ipq_id && - ip->ip_src.s_addr == fp->ipq_src.s_addr && - ip->ip_dst.s_addr == fp->ipq_dst.s_addr && - ip->ip_p == fp->ipq_p) - goto found; - - fp = 0; - - /* check if there's a place for the new queue */ - if (nipq > maxnipq) { - /* - * drop something from the tail of the current queue - * before proceeding further - */ - if (ipq[sum].prev == &ipq[sum]) { /* gak */ - for (i = 0; i < IPREASS_NHASH; i++) { - if (ipq[i].prev != &ipq[i]) { - ip_freef(ipq[i].prev); - break; - } - } - } else - ip_freef(ipq[sum].prev); - } -found: - /* - * Adjust ip_len to not reflect header, - * set ip_mff if more fragments are expected, - * convert offset of this to bytes. - */ - ip->ip_len -= hlen; - mff = (ip->ip_off & IP_MF) != 0; - if (mff) { - /* - * 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) { - ipstat.ips_toosmall++; /* XXX */ - goto bad; - } - m->m_flags |= M_FRAG; - } - ip->ip_off <<= 3; - + if (ip->ip_off & ~(IP_DF | IP_RF)) { /* - * If datagram marked as having more fragments - * or if this is not the first fragment, - * attempt reassembly; if it succeeds, proceed. + * ip_reass() will return a different mbuf, and update + * the divert info in div_info and args.fwa_divert_rule. */ - if (mff || ip->ip_off) { - ipstat.ips_fragments++; - m->m_pkthdr.header = ip; #if IPDIVERT - m = ip_reass(m, - fp, &ipq[sum], &divert_info, &divert_cookie); + m = ip_reass(m, (u_int16_t *)&div_info, &args.fwa_divert_rule); #else - m = ip_reass(m, fp, &ipq[sum]); -#endif - if (m == 0) { -#if IPFIREWALL_FORWARD - ip_fw_fwd_addr = NULL; + m = ip_reass(m); #endif - return; - } - ipstat.ips_reassembled++; - ip = mtod(m, struct ip *); - /* Get the header length of the reassembled packet */ - hlen = IP_VHL_HL(ip->ip_vhl) << 2; + 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 (divert_info != 0) { - ip->ip_len += hlen; - HTONS(ip->ip_len); - HTONS(ip->ip_off); - ip->ip_sum = 0; - ip->ip_sum = in_cksum(m, hlen); - NTOHS(ip->ip_off); - NTOHS(ip->ip_len); - ip->ip_len -= hlen; - } + /* Restore original checksum before diverting packet */ + if (div_info != 0) { +#if BYTE_ORDER != BIG_ENDIAN + HTONS(ip->ip_len); + HTONS(ip->ip_off); #endif - } else - if (fp) - ip_freef(fp); - } else - ip->ip_len -= hlen; + 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 divert_info is zero then cookie should be too, so we shouldn't + * 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 (divert_info != 0) { + if (div_info != 0) { struct mbuf *clone = NULL; /* Clone packet if we're doing a 'tee' */ - if ((divert_info & IP_FW_PORT_TEE_FLAG) != 0) + 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 */ - ip_divert_cookie = divert_cookie; - divert_packet(m, 1, divert_info & 0xffff); - ipstat.ips_delivered++; + 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) + if (clone == NULL) { return; + } m = clone; ip = mtod(m, struct ip *); } @@ -920,61 +2381,136 @@ found: * 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) != 0 && - ipsec4_in_reject(m, NULL)) { - ipsecstat.in_polvio++; - goto bad; + 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 +#endif /* IPSEC */ /* * Switch out to protocol's input routine. */ - ipstat.ips_delivered++; - { - KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr, - ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); + 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; - (*ip_protox[ip->ip_p]->pr_input)(m, hlen); -#if IPFIREWALL_FORWARD - ip_fw_fwd_addr = NULL; /* tcp needed it */ -#endif - return; + 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: -#if IPFIREWALL_FORWARD - ip_fw_fwd_addr = NULL; -#endif - KERNEL_DEBUG(DBG_LAYER_END, 0,0,0,0,0); + KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0); m_freem(m); } -/* - * IP software interrupt routine - to go away sometime soon - */ -void -ipintr(void) +static void +ipq_updateparams(void) { - int s; - struct mbuf *m; - - KERNEL_DEBUG(DBG_FNC_IP_INPUT | DBG_FUNC_START, 0,0,0,0,0); - - while(1) { - s = splimp(); - IF_DEQUEUE(&ipintrq, m); - splx(s); - if (m == 0) { - KERNEL_DEBUG(DBG_FNC_IP_INPUT | DBG_FUNC_END, 0,0,0,0,0); - return; - } + 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(); +} - ip_input(m); +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); } -NETISR_SET(NETISR_IP, ipintr); - /* * Take incoming datagram fragment and try to reassemble it into * whole datagram. If a chain for reassembly of this datagram already @@ -982,32 +2518,176 @@ NETISR_SET(NETISR_IP, ipintr); * * 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(m, fp, where, divinfo, divcookie) -#else -ip_reass(m, fp, where) -#endif - register struct mbuf *m; - register struct ipq *fp; - struct ipq *where; -#if IPDIVERT +ip_reass(struct mbuf *m, #ifdef IPDIVERT_44 - u_int32_t *divinfo; -#else - u_int16_t *divinfo; + 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 - u_int16_t *divcookie; + /* 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 -{ - struct ip *ip = mtod(m, struct ip *); - register struct mbuf *p = 0, *q, *nq; - struct mbuf *t; - int hlen = IP_VHL_HL(ip->ip_vhl) << 2; - int i, next; + } + 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. @@ -1015,26 +2695,24 @@ ip_reass(m, fp, where) m->m_data += hlen; m->m_len -= hlen; - if (m->m_pkthdr.csum_flags & CSUM_TCP_SUM16) - m->m_pkthdr.csum_flags = 0; /* * If first fragment to arrive, create a reassembly queue. */ - if (fp == 0) { - /* - * Enforce upper bound on number of fragmented packets - * for which we attempt reassembly; - * If maxfrag is 0, never accept fragments. - * If maxfrag is -1, accept all fragments without limitation. - */ - if ((ip_maxfragpackets >= 0) && (ip_nfragpackets >= ip_maxfragpackets)) + if (fp == NULL) { + fp = ipq_alloc(M_DONTWAIT); + if (fp == NULL) goto dropfrag; - ip_nfragpackets++; - if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL) +#if CONFIG_MACF_NET + if (mac_ipq_label_init(fp, M_NOWAIT) != 0) { + ipq_free(fp); + fp = NULL; goto dropfrag; - fp = mtod(t, struct ipq *); - insque((void*)fp, (void*)where); + } + 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; @@ -1042,18 +2720,56 @@ ip_reass(m, fp, where) 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 = 0; + fp->ipq_div_info = *divinfo; #else - fp->ipq_divert = 0; + fp->ipq_divert = *divinfo; #endif - fp->ipq_div_cookie = 0; + 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 - goto inserted; } -#define GETIP(m) ((struct ip*)((m)->m_pkthdr.header)) +#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. @@ -1068,7 +2784,7 @@ ip_reass(m, fp, where) * 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 the preceding + * If some of the data is dropped from the preceding * segment, then it's checksum is invalidated. */ if (p) { @@ -1077,7 +2793,7 @@ ip_reass(m, fp, where) if (i >= ip->ip_len) goto dropfrag; m_adj(m, i); - m->m_pkthdr.csum_flags = 0; + fp->ipq_csum_flags = 0; ip->ip_off += i; ip->ip_len -= i; } @@ -1093,50 +2809,81 @@ ip_reass(m, fp, where) * 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; + 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); - q->m_pkthdr.csum_flags = 0; + fp->ipq_csum_flags = 0; break; } nq = q->m_nextpkt; m->m_nextpkt = nq; - m_freem(q); + ipstat.ips_fragdropped++; + fp->ipq_nfrags--; + /* defer freeing until after lock is dropped */ + MBUFQ_ENQUEUE(&dfq, q); } -inserted: + /* + * 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. - * Any fragment diverting causes the whole packet to divert. + * Only trust info in the fragment at offset 0. */ + if (ip->ip_off == 0) { #ifdef IPDIVERT_44 - fp->ipq_div_info = *divinfo; + fp->ipq_div_info = *divinfo; #else - fp->ipq_divert = *divinfo; + fp->ipq_divert = *divinfo; #endif - fp->ipq_div_cookie = *divcookie; + fp->ipq_div_cookie = *divcookie; + } *divinfo = 0; *divcookie = 0; -#endif +#endif /* IPDIVERT */ /* - * Check for complete reassembly. + * 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) - return (0); + 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) - return (0); + 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. @@ -1145,8 +2892,10 @@ inserted: ip = GETIP(q); if (next + (IP_VHL_HL(ip->ip_vhl) << 2) > IP_MAXPACKET) { ipstat.ips_toolong++; - ip_freef(fp); - return (0); + ipstat.ips_fragdropped += fp->ipq_nfrags; + frag_freef(head, fp); + m = NULL; /* nothing to return */ + goto done; } /* @@ -1154,22 +2903,39 @@ inserted: */ m = q; t = m->m_next; - m->m_next = 0; + m->m_next = NULL; m_cat(m, t); nq = q->m_nextpkt; - q->m_nextpkt = 0; + q->m_nextpkt = NULL; for (q = nq; q != NULL; q = nq) { nq = q->m_nextpkt; q->m_nextpkt = NULL; - if (q->m_pkthdr.csum_flags & CSUM_TCP_SUM16) - m->m_pkthdr.csum_flags = 0; - else { - m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags; - m->m_pkthdr.csum_data += q->m_pkthdr.csum_data; - } 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. @@ -1180,41 +2946,69 @@ inserted: *divinfo = fp->ipq_divert; #endif *divcookie = fp->ipq_div_cookie; -#endif +#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. + * Create header for new ip packet by modifying header of first + * packet; dequeue and discard fragment reassembly header. * Make header visible. */ - ip->ip_len = next; + ip->ip_len = (IP_VHL_HL(ip->ip_vhl) << 2) + next; ip->ip_src = fp->ipq_src; ip->ip_dst = fp->ipq_dst; - remque((void*)fp); - nipq--; - (void) m_free(dtom(fp)); - ip_nfragpackets--; + + 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 */ - register int plen = 0; - for (t = m; t; t = t->m_next) - plen += t->m_len; - m->m_pkthdr.len = plen; - } + 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 +#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); - return (0); - + /* perform deferred free (if needed) */ + if (!MBUFQ_EMPTY(&dfq)) + MBUFQ_DRAIN(&dfq); + VERIFY(MBUFQ_EMPTY(&dfq)); + return (NULL); #undef GETIP } @@ -1223,44 +3017,47 @@ dropfrag: * associated datagrams. */ static void -ip_freef(fp) - struct ipq *fp; +frag_freef(struct ipqhead *fhp, struct ipq *fp) { - register struct mbuf *q; + lck_mtx_assert(&ipqlock, LCK_MTX_ASSERT_OWNED); - while (fp->ipq_frags) { - q = fp->ipq_frags; - fp->ipq_frags = q->m_nextpkt; - m_freem(q); + fp->ipq_nfrags = 0; + if (fp->ipq_frags != NULL) { + m_freem_list(fp->ipq_frags); + fp->ipq_frags = NULL; } - remque((void*)fp); - (void) m_free(dtom(fp)); - ip_nfragpackets--; + TAILQ_REMOVE(fhp, fp, ipq_list); nipq--; + ipq_free(fp); } /* - * IP timer processing; - * if a timer expires on a reassembly - * queue, discard it. + * IP reassembly timer processing */ -void -ip_slowtimo() +static void +frag_timeout(void *arg) { - register struct ipq *fp; - int s = splnet(); +#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++) { - fp = ipq[i].next; - if (fp == 0) - continue; - while (fp != &ipq[i]) { - --fp->ipq_ttl; - fp = fp->next; - if (fp->prev->ipq_ttl == 0) { - ipstat.ips_fragtimeout++; - ip_freef(fp->prev); + 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); } } } @@ -1269,54 +3066,123 @@ ip_slowtimo() * (due to the limit being lowered), drain off * enough to get down to the new limit. */ - for (i = 0; i < IPREASS_NHASH; i++) { - if (ip_maxfragpackets >= 0) { - while ((ip_nfragpackets > ip_maxfragpackets) && - (ipq[i].next != &ipq[i])) { - ipstat.ips_fragdropped++; - ip_freef(ipq[i].next); + 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])); } } } - ipflow_slowtimo(); - splx(s); + /* 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. */ -void -ip_drain() +static void +frag_drain(void) { - int i; + int i; + lck_mtx_lock(&ipqlock); for (i = 0; i < IPREASS_NHASH; i++) { - while (ipq[i].next != &ipq[i]) { - ipstat.ips_fragdropped++; - ip_freef(ipq[i].next); + while (!TAILQ_EMPTY(&ipq[i])) { + ipstat.ips_fragdropped += + TAILQ_FIRST(&ipq[i])->ipq_nfrags; + frag_freef(&ipq[i], TAILQ_FIRST(&ipq[i])); } } - in_rtqdrain(); + 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(m) - struct mbuf *m; +ip_dooptions(struct mbuf *m, int pass, struct sockaddr_in *next_hop) { - register struct ip *ip = mtod(m, struct ip *); - register u_char *cp; - register struct ip_timestamp *ipt; - register struct in_ifaddr *ia; +#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; - n_time ntime; + 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); @@ -1328,12 +3194,13 @@ ip_dooptions(m) if (opt == IPOPT_NOP) optlen = 1; else { - if (cnt < IPOPT_OLEN + sizeof(*cp)) { + 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) { + if (optlen < IPOPT_OLEN + sizeof (*cp) || + optlen > cnt) { code = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } @@ -1354,7 +3221,7 @@ ip_dooptions(m) */ case IPOPT_LSRR: case IPOPT_SSRR: - if (optlen < IPOPT_OFFSET + sizeof(*cp)) { + if (optlen < IPOPT_OFFSET + sizeof (*cp)) { code = &cp[IPOPT_OLEN] - (u_char *)ip; goto bad; } @@ -1363,9 +3230,8 @@ ip_dooptions(m) goto bad; } ipaddr.sin_addr = ip->ip_dst; - ia = (struct in_ifaddr *) - ifa_ifwithaddr((struct sockaddr *)&ipaddr); - if (ia == 0) { + ia = (struct in_ifaddr *)ifa_ifwithaddr(SA(&ipaddr)); + if (ia == NULL) { if (opt == IPOPT_SSRR) { type = ICMP_UNREACH; code = ICMP_UNREACH_SRCFAIL; @@ -1378,9 +3244,12 @@ ip_dooptions(m) * 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)) { + if (off > optlen - (int)sizeof (struct in_addr)) { /* * End of source route. Should be for us. */ @@ -1392,23 +3261,28 @@ ip_dooptions(m) if (!ip_dosourceroute) { if (ipforwarding) { - char buf[16]; /* aaa.bbb.ccc.ddd\0 */ + char buf[MAX_IPv4_STR_LEN]; + char buf2[MAX_IPv4_STR_LEN]; /* * Acting as a router, so generate ICMP */ nosourcerouting: - strcpy(buf, inet_ntoa(ip->ip_dst)); - log(LOG_WARNING, - "attempted source route from %s to %s\n", - inet_ntoa(ip->ip_src), buf); + 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. + * Not acting as a router, + * so silently drop. */ - ipstat.ips_cantforward++; + OSAddAtomic(1, &ipstat.ips_cantforward); m_freem(m); return (1); } @@ -1417,25 +3291,31 @@ nosourcerouting: /* * locate outgoing interface */ - (void)memcpy(&ipaddr.sin_addr, cp + off, - sizeof(ipaddr.sin_addr)); + (void) memcpy(&ipaddr.sin_addr, cp + off, + sizeof (ipaddr.sin_addr)); if (opt == IPOPT_SSRR) { #define INA struct in_ifaddr * -#define SA struct sockaddr * - if ((ia = (INA)ifa_ifwithdstaddr((SA)&ipaddr)) == 0) - ia = (INA)ifa_ifwithnet((SA)&ipaddr); - } else + if ((ia = (INA)ifa_ifwithdstaddr( + SA(&ipaddr))) == NULL) { + ia = (INA)ifa_ifwithnet(SA(&ipaddr)); + } + } else { ia = ip_rtaddr(ipaddr.sin_addr); - if (ia == 0) { + } + if (ia == NULL) { type = ICMP_UNREACH; code = ICMP_UNREACH_SRCFAIL; goto bad; } ip->ip_dst = ipaddr.sin_addr; - (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), - sizeof(struct in_addr)); - cp[IPOPT_OFFSET] += sizeof(struct in_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 */ @@ -1443,7 +3323,7 @@ nosourcerouting: break; case IPOPT_RR: - if (optlen < IPOPT_OFFSET + sizeof(*cp)) { + if (optlen < IPOPT_OFFSET + sizeof (*cp)) { code = &cp[IPOPT_OFFSET] - (u_char *)ip; goto bad; } @@ -1455,28 +3335,33 @@ nosourcerouting: * If no space remains, ignore. */ off--; /* 0 origin */ - if (off > optlen - (int)sizeof(struct in_addr)) + if (off > optlen - (int)sizeof (struct in_addr)) break; - (void)memcpy(&ipaddr.sin_addr, &ip->ip_dst, - sizeof(ipaddr.sin_addr)); + (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)) == 0 && - (ia = ip_rtaddr(ipaddr.sin_addr)) == 0) { - type = ICMP_UNREACH; - code = ICMP_UNREACH_HOST; - goto bad; + 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; + } } - (void)memcpy(cp + off, &(IA_SIN(ia)->sin_addr), - sizeof(struct in_addr)); - cp[IPOPT_OFFSET] += sizeof(struct in_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); break; case IPOPT_TS: code = cp - (u_char *)ip; - ipt = (struct ip_timestamp *)cp; + 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; @@ -1486,7 +3371,7 @@ nosourcerouting: goto bad; } if (ipt->ipt_ptr > - ipt->ipt_len - (int)sizeof(int32_t)) { + ipt->ipt_len - (int)sizeof (int32_t)) { if (++ipt->ipt_oflw == 0) { code = (u_char *)&ipt->ipt_ptr - (u_char *)ip; @@ -1494,41 +3379,48 @@ nosourcerouting: } break; } - sin = (struct in_addr *)(cp + ipt->ipt_ptr - 1); + 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) { + 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 == 0) + ia = (INA)ifaof_ifpforaddr(SA(&ipaddr), + m->m_pkthdr.rcvif); + if (ia == NULL) continue; - (void)memcpy(sin, &IA_SIN(ia)->sin_addr, - sizeof(struct in_addr)); - ipt->ipt_ptr += sizeof(struct in_addr); + 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) { + 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 (ifa_ifwithaddr((SA)&ipaddr) == 0) + (void) memcpy(&ipaddr.sin_addr, sin, + sizeof (struct in_addr)); + if ((ia = (struct in_ifaddr *)ifa_ifwithaddr( + SA(&ipaddr))) == NULL) continue; - ipt->ipt_ptr += sizeof(struct in_addr); + IFA_REMREF(&ia->ia_ifa); + ia = NULL; + ipt->ipt_ptr += sizeof (struct in_addr); break; default: @@ -1538,49 +3430,113 @@ nosourcerouting: goto bad; } ntime = iptime(); - (void)memcpy(cp + ipt->ipt_ptr - 1, &ntime, - sizeof(n_time)); - ipt->ipt_ptr += sizeof(n_time); + (void) memcpy(cp + ipt->ipt_ptr - 1, &ntime, + sizeof (n_time)); + ipt->ipt_ptr += sizeof (n_time); } } if (forward && ipforwarding) { - ip_forward(m, 1); + ip_forward(m, 1, next_hop); return (1); } return (0); bad: - ip->ip_len -= IP_VHL_HL(ip->ip_vhl) << 2; /* XXX icmp_error adds in hdr length */ icmp_error(m, type, code, 0, 0); - ipstat.ips_badoptions++; + OSAddAtomic(1, &ipstat.ips_badoptions); return (1); } /* - * Given address of next destination (final or next hop), - * return internet address info of interface to be used to get there. + * 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. */ -static struct in_ifaddr * -ip_rtaddr(dst) - struct in_addr dst; +int +ip_checkrouteralert(struct mbuf *m) { - register struct sockaddr_in *sin; - - sin = (struct sockaddr_in *) &ipforward_rt.ro_dst; + struct ip *ip = mtod(m, struct ip *); + u_char *cp; + int opt, optlen, cnt, found_ra; - if (ipforward_rt.ro_rt == 0 || dst.s_addr != sin->sin_addr.s_addr) { - if (ipforward_rt.ro_rt) { - rtfree(ipforward_rt.ro_rt); - ipforward_rt.ro_rt = 0; + 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 } - sin->sin_family = AF_INET; - sin->sin_len = sizeof(*sin); - sin->sin_addr = dst; + 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; + } + } - rtalloc_ign(&ipforward_rt, RTF_PRCLONING); + 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); } - if (ipforward_rt.ro_rt == 0) - return ((struct in_ifaddr *)0); - return ((struct in_ifaddr *) ipforward_rt.ro_rt->rt_ifa); + + 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); } /* @@ -1588,9 +3544,7 @@ ip_rtaddr(dst) * to be picked up later by ip_srcroute if the receiver is interested. */ void -save_rte(option, dst) - u_char *option; - struct in_addr dst; +save_rte(u_char *option, struct in_addr dst) { unsigned olen; @@ -1599,10 +3553,10 @@ save_rte(option, dst) if (ipprintfs) printf("save_rte: olen %d\n", olen); #endif - if (olen > sizeof(ip_srcrt) - (1 + sizeof(dst))) + 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_nhops = (olen - IPOPT_OFFSET - 1) / sizeof (struct in_addr); ip_srcrt.dst = dst; } @@ -1612,22 +3566,23 @@ save_rte(option, dst) * The first hop is placed before the options, will be removed later. */ struct mbuf * -ip_srcroute() +ip_srcroute(void) { - register struct in_addr *p, *q; - register struct mbuf *m; + struct in_addr *p, *q; + struct mbuf *m; if (ip_nhops == 0) - return ((struct mbuf *)0); + return (NULL); + m = m_get(M_DONTWAIT, MT_HEADER); - if (m == 0) - return ((struct mbuf *)0); + if (m == NULL) + return (NULL); -#define OPTSIZ (sizeof(ip_srcrt.nop) + sizeof(ip_srcrt.srcopt)) +#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; + 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); @@ -1640,7 +3595,8 @@ ip_srcroute() *(mtod(m, struct in_addr *)) = *p--; #if DIAGNOSTIC if (ipprintfs) - printf(" hops %lx", (u_long)ntohl(mtod(m, struct in_addr *)->s_addr)); + printf(" hops %lx", + (u_int32_t)ntohl(mtod(m, struct in_addr *)->s_addr)); #endif /* @@ -1648,10 +3604,10 @@ ip_srcroute() */ ip_srcrt.nop = IPOPT_NOP; ip_srcrt.srcopt[IPOPT_OFFSET] = IPOPT_MINOFF; - (void)memcpy(mtod(m, caddr_t) + sizeof(struct in_addr), + (void) memcpy(mtod(m, caddr_t) + sizeof (struct in_addr), &ip_srcrt.nop, OPTSIZ); - q = (struct in_addr *)(mtod(m, caddr_t) + - sizeof(struct in_addr) + 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, @@ -1660,7 +3616,7 @@ ip_srcroute() while (p >= ip_srcrt.route) { #if DIAGNOSTIC if (ipprintfs) - printf(" %lx", (u_long)ntohl(q->s_addr)); + printf(" %lx", (u_int32_t)ntohl(q->s_addr)); #endif *q++ = *p--; } @@ -1670,7 +3626,7 @@ ip_srcroute() *q = ip_srcrt.dst; #if DIAGNOSTIC if (ipprintfs) - printf(" %lx\n", (u_long)ntohl(q->s_addr)); + printf(" %lx\n", (u_int32_t)ntohl(q->s_addr)); #endif return (m); } @@ -1683,15 +3639,17 @@ ip_srcroute() * XXX should be deleted; last arg currently ignored. */ void -ip_stripoptions(m, mopt) - register struct mbuf *m; - struct mbuf *mopt; +ip_stripoptions(struct mbuf *m, struct mbuf *mopt) { - register int i; +#pragma unused(mopt) + int i; struct ip *ip = mtod(m, struct ip *); - register caddr_t opts; + 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); @@ -1699,18 +3657,87 @@ ip_stripoptions(m, mopt) 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); + ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof (struct ip) >> 2); } u_char inetctlerrmap[PRC_NCMDS] = { 0, 0, 0, 0, 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, - EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, + 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 @@ -1726,38 +3753,57 @@ u_char inetctlerrmap[PRC_NCMDS] = { * via a source route. */ static void -ip_forward(m, srcrt) - struct mbuf *m; - int srcrt; +ip_forward(struct mbuf *m, int srcrt, struct sockaddr_in *next_hop) { - register struct ip *ip = mtod(m, struct ip *); - register struct sockaddr_in *sin; - register struct rtentry *rt; +#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 ifnet *destifp; + struct in_addr pkt_dst; + u_int32_t nextmtu = 0, len; + struct ip_out_args ipoa = { IFSCOPE_NONE, { 0 }, 0, 0, + SO_TC_UNSPEC, _NET_SERVICE_TYPE_UNSPEC }; + struct ifnet *rcvifp = m->m_pkthdr.rcvif; #if IPSEC - struct ifnet dummyifp; -#endif + 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_long)ip->ip_src.s_addr, (u_long)ip->ip_dst.s_addr, + (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(ip->ip_dst) == 0) { - ipstat.ips_cantforward++; + 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 +#endif /* IPSTEALTH */ if (ip->ip_ttl <= IPTTLDEC) { icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0); @@ -1765,26 +3811,33 @@ ip_forward(m, srcrt) } #if IPSTEALTH } -#endif +#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 = (struct sockaddr_in *)&ipforward_rt.ro_dst; - if ((rt = ipforward_rt.ro_rt) == 0 || - ip->ip_dst.s_addr != sin->sin_addr.s_addr) { - if (ipforward_rt.ro_rt) { - rtfree(ipforward_rt.ro_rt); - ipforward_rt.ro_rt = 0; - } sin->sin_family = AF_INET; - sin->sin_len = sizeof(*sin); - sin->sin_addr = ip->ip_dst; + sin->sin_len = sizeof (*sin); + sin->sin_addr = pkt_dst; - rtalloc_ign(&ipforward_rt, RTF_PRCLONING); - if (ipforward_rt.ro_rt == 0) { + 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); - return; + goto done; } - rt = ipforward_rt.ro_rt; } + rt = fwd_rt.ro_rt; /* * Save the IP header and at most 8 bytes of the payload, @@ -1805,11 +3858,11 @@ ip_forward(m, srcrt) #if IPSTEALTH if (!ipstealth) { -#endif +#endif /* IPSTEALTH */ ip->ip_ttl -= IPTTLDEC; #if IPSTEALTH } -#endif +#endif /* IPSTEALTH */ /* * If forwarding packet using same interface that it came in on, @@ -1819,52 +3872,101 @@ ip_forward(m, srcrt) * Also, don't send redirect if forwarding using a default route * or a route modified by a redirect. */ -#define satosin(sa) ((struct sockaddr_in *)(sa)) + RT_LOCK_SPIN(rt); if (rt->rt_ifp == m->m_pkthdr.rcvif && - (rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 && - satosin(rt_key(rt))->sin_addr.s_addr != 0 && - ipsendredirects && !srcrt) { -#define RTA(rt) ((struct in_ifaddr *)(rt->rt_ifa)) - u_long src = ntohl(ip->ip_src.s_addr); - - if (RTA(rt) && - (src & RTA(rt)->ia_subnetmask) == RTA(rt)->ia_subnet) { - if (rt->rt_flags & RTF_GATEWAY) - dest = satosin(rt->rt_gateway)->sin_addr.s_addr; - else - dest = ip->ip_dst.s_addr; - /* Router requirements says to only send host redirects */ - type = ICMP_REDIRECT; - code = ICMP_REDIRECT_HOST; + !(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_long)dest); + 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 */ - error = ip_output(m, (struct mbuf *)0, &ipforward_rt, - IP_FORWARDING, 0); - if (error) - ipstat.ips_cantforward++; - else { - ipstat.ips_forward++; - if (type) - ipstat.ips_redirectsent++; - else { - if (mcopy) { - ipflow_create(&ipforward_rt, mcopy); + /* 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); } - return; + goto done; } } if (mcopy == NULL) - return; - destifp = NULL; + goto done; switch (error) { - case 0: /* forwarded, but need redirect */ /* type, code set above */ break; @@ -1881,194 +3983,462 @@ ip_forward(m, srcrt) case EMSGSIZE: type = ICMP_UNREACH; code = ICMP_UNREACH_NEEDFRAG; -#ifndef IPSEC - if (ipforward_rt.ro_rt) - destifp = ipforward_rt.ro_rt->rt_ifp; -#else + + 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!!! */ - if (ipforward_rt.ro_rt) { - struct secpolicy *sp = NULL; - int ipsecerror; - int ipsechdr; - struct route *ro; + sp = ipsec4_getpolicybyaddr(mcopy, IPSEC_DIR_OUTBOUND, + IP_FORWARDING, &ipsecerror); - if (ipsec_bypass) { - destifp = ipforward_rt.ro_rt->rt_ifp; - ipstat.ips_cantfrag++; - break; - } + if (sp == NULL) + break; - sp = ipsec4_getpolicybyaddr(mcopy, - IPSEC_DIR_OUTBOUND, - IP_FORWARDING, - &ipsecerror); + /* + * find the correct route for outer IPv4 + * header, compute tunnel MTU. + */ + nextmtu = 0; - if (sp == NULL) - destifp = ipforward_rt.ro_rt->rt_ifp; - else { - /* count IPsec header size */ - ipsechdr = ipsec4_hdrsiz(mcopy, - IPSEC_DIR_OUTBOUND, - NULL); + 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; - /* - * find the correct route for outer IPv4 - * header, compute tunnel MTU. - * - * XXX BUG ALERT - * The "dummyifp" code relies upon the fact - * that icmp_error() touches only ifp->if_mtu. - */ - /*XXX*/ - destifp = NULL; - if (sp->req != NULL - && sp->req->sav != NULL - && sp->req->sav->sah != NULL) { - ro = &sp->req->sav->sah->sa_route; - if (ro->ro_rt && ro->ro_rt->rt_ifp) { - dummyifp.if_mtu = - ro->ro_rt->rt_ifp->if_mtu; - dummyifp.if_mtu -= ipsechdr; - destifp = &dummyifp; + /* 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_freesp(sp); + key_freesav(sav, KEY_SADB_LOCKED); + lck_mtx_unlock(sadb_mutex); } } -#endif /*IPSEC*/ - ipstat.ips_cantfrag++; + key_freesp(sp, KEY_SADB_UNLOCKED); +#endif /* IPSEC */ break; case ENOBUFS: - type = ICMP_SOURCEQUENCH; - code = 0; + /* + * 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); - return; + goto done; } - icmp_error(mcopy, type, code, dest, destifp); + + 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); } -void -ip_savecontrol(inp, mp, ip, m) - register struct inpcb *inp; - register struct mbuf **mp; - register struct ip *ip; - register struct mbuf *m; +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; - microtime(&tv); - *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), - SCM_TIMESTAMP, SOL_SOCKET); - if (*mp) - mp = &(*mp)->m_next; + 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((caddr_t) &ip->ip_dst, - sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP); - if (*mp) - mp = &(*mp)->m_next; + 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 + /* + * 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((caddr_t) opts_deleted_above, - sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP); - if (*mp) - mp = &(*mp)->m_next; + 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((caddr_t) ip_srcroute(), - sizeof(struct in_addr), IP_RECVRETOPTS, IPPROTO_IP); - if (*mp) - mp = &(*mp)->m_next; + mp = sbcreatecontrol_mbuf((caddr_t)ip_srcroute(), + sizeof (struct in_addr), IP_RECVRETOPTS, IPPROTO_IP, mp); + if (*mp == NULL) { + goto no_mbufs; + } } -#endif +#endif /* notyet */ if (inp->inp_flags & INP_RECVIF) { struct ifnet *ifp; - struct sdlbuf { - struct sockaddr_dl sdl; - u_char pad[32]; - } sdlbuf; - struct sockaddr_dl *sdp; - struct sockaddr_dl *sdl2 = &sdlbuf.sdl; - - if (((ifp = m->m_pkthdr.rcvif)) - && ( ifp->if_index && (ifp->if_index <= if_index))) { - sdp = (struct sockaddr_dl *)(ifnet_addrs - [ifp->if_index - 1]->ifa_addr); + 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) - || (sdp->sdl_len > sizeof(sdlbuf))) { + 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]); +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; } - *mp = sbcreatecontrol((caddr_t) sdl2, sdl2->sdl_len, - IP_RECVIF, IPPROTO_IP); - if (*mp) - mp = &(*mp)->m_next; + 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); } -int -ip_rsvp_init(struct socket *so) +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) { - if (so->so_type != SOCK_RAW || - so->so_proto->pr_protocol != IPPROTO_RSVP) - return EOPNOTSUPP; + 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; + } +} - if (ip_rsvpd != NULL) - return EADDRINUSE; +void +ip_setdstifaddr_info(struct mbuf *m, uint32_t dst_idx, struct in_ifaddr *ia) +{ + VERIFY(m->m_flags & M_PKTHDR); - ip_rsvpd = so; /* - * This may seem silly, but we need to be sure we don't over-increment - * the RSVP counter, in case something slips up. + * 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 (!ip_rsvp_on) { - ip_rsvp_on = 1; - rsvp_on++; + 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; + return (0); } int -ip_rsvp_done(void) +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) { - ip_rsvpd = NULL; + 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); + } + /* - * This may seem silly, but we need to be sure we don't over-decrement - * the RSVP counter, in case something slips up. + * 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 (ip_rsvp_on) { - ip_rsvp_on = 0; - rsvp_on--; + if (m != NULL) + rip_input(m, off); +} + +/* + * Private KPI for PPP/PPTP. + */ +int +ip_gre_register_input(gre_input_func_t fn) +{ + lck_mtx_lock(inet_domain_mutex); + gre_input_func = fn; + lck_mtx_unlock(inet_domain_mutex); + + return (0); +} + +#if (DEBUG || DEVELOPMENT) +static int +sysctl_reset_ip_input_stats SYSCTL_HANDLER_ARGS +{ +#pragma unused(arg1, arg2) + int error, i; + + i = ip_input_measure; + error = sysctl_handle_int(oidp, &i, 0, req); + if (error || req->newptr == USER_ADDR_NULL) + goto done; + /* impose bounds */ + if (i < 0 || i > 1) { + error = EINVAL; + goto done; + } + if (ip_input_measure != i && i == 1) { + net_perf_initialize(&net_perf, ip_input_measure_bins); + } + ip_input_measure = i; +done: + return (error); +} + +static int +sysctl_ip_input_measure_bins SYSCTL_HANDLER_ARGS +{ +#pragma unused(arg1, arg2) + int error; + uint64_t i; + + i = ip_input_measure_bins; + error = sysctl_handle_quad(oidp, &i, 0, req); + if (error || req->newptr == USER_ADDR_NULL) + goto done; + /* validate data */ + if (!net_perf_validate_bins(i)) { + error = EINVAL; + goto done; } - return 0; + ip_input_measure_bins = i; +done: + return (error); +} + +static int +sysctl_ip_input_getperf SYSCTL_HANDLER_ARGS +{ +#pragma unused(oidp, arg1, arg2) + if (req->oldptr == USER_ADDR_NULL) + req->oldlen = (size_t)sizeof (struct ipstat); + + return (SYSCTL_OUT(req, &net_perf, MIN(sizeof (net_perf), req->oldlen))); } +#endif /* (DEBUG || DEVELOPMENT) */