/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2015 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1982, 1986, 1988, 1993
* SUCH DAMAGE.
*
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
- * $ANA: ip_input.c,v 1.5 1996/09/18 14:34:59 wollman 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
-#include <stddef.h>
-
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/sysctl.h>
+#include <sys/mcache.h>
+#include <sys/socketvar.h>
+#include <sys/kdebug.h>
+#include <mach/mach_time.h>
+#include <mach/sdt.h>
+
+#include <machine/endian.h>
+#include <dev/random/randomdev.h>
#include <kern/queue.h>
+#include <kern/locks.h>
+#include <libkern/OSAtomic.h>
+
+#include <pexpert/pexpert.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/route.h>
-#include <net/netisr.h>
+#include <net/kpi_protocol.h>
+#include <net/ntstat.h>
+#include <net/dlil.h>
+#include <net/classq/classq.h>
+#include <net/net_perf.h>
+#if PF
+#include <net/pfvar.h>
+#endif /* PF */
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
+#include <netinet/in_arp.h>
#include <netinet/ip.h>
-#ifdef INET6
-#include <netinet/ip6.h>
-#include <netinet6/ip6_var.h>
-#endif
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
-#include <sys/socketvar.h>
-
-#include <sys/kdebug.h>
-
-
-#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 0)
-#define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 2)
-#define DBG_FNC_IP_INPUT NETDBG_CODE(DBG_NETIP, (2 << 8))
+#include <netinet/ip_fw.h>
+#include <netinet/ip_divert.h>
+#include <netinet/kpi_ipfilter_var.h>
+#include <netinet/udp.h>
+#include <netinet/udp_var.h>
+#include <netinet/bootp.h>
+#include <netinet/lro_ext.h>
+#if DUMMYNET
+#include <netinet/ip_dummynet.h>
+#endif /* DUMMYNET */
-#if IPFIREWALL
-#include <netinet/ip_fw.h>
-#endif
+#if CONFIG_MACF_NET
+#include <security/mac_framework.h>
+#endif /* CONFIG_MACF_NET */
#if IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
-#include <netkey/key_debug.h>
-#endif
+#endif /* IPSEC */
-#include "faith.h"
-#if defined(NFAITH) && NFAITH > 0
-#include <net/if_types.h>
-#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 DUMMYNET
-#include <netinet/ip_dummynet.h>
-#endif
+#if IPSEC
+extern int ipsec_bypass;
+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, "");
+MBUFQ_HEAD(fq_head);
-static int ipsendredirects = 1; /* XXX */
-SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_RW,
- &ipsendredirects, 0, "");
+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, "");
+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, "");
+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;
+/* Packet reassembly stuff */
+#define IPREASS_NHASH_LOG2 6
+#define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
+#define IPREASS_HMASK (IPREASS_NHASH - 1)
+#define IPREASS_HASH(x, y) \
+ (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
+
+/* IP fragment reassembly queues (protected by ipqlock) */
+static TAILQ_HEAD(ipqhead, ipq) ipq[IPREASS_NHASH]; /* ip reassembly queues */
+static int maxnipq; /* max packets in reass queues */
+static u_int32_t maxfragsperpacket; /* max frags/packet in reass queues */
+static u_int32_t nipq; /* # of packets in reass queues */
+static u_int32_t ipq_limit; /* ipq allocation limit */
+static u_int32_t ipq_count; /* current # of allocated ipq's */
+
+static int sysctl_ipforwarding SYSCTL_HANDLER_ARGS;
+static int sysctl_maxnipq SYSCTL_HANDLER_ARGS;
+static int sysctl_maxfragsperpacket SYSCTL_HANDLER_ARGS;
+static int sysctl_reset_ip_input_stats SYSCTL_HANDLER_ARGS;
+static int sysctl_ip_input_measure_bins SYSCTL_HANDLER_ARGS;
+static int sysctl_ip_input_getperf SYSCTL_HANDLER_ARGS;
+
+int ipforwarding = 0;
+SYSCTL_PROC(_net_inet_ip, IPCTL_FORWARDING, forwarding,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ipforwarding, 0,
+ sysctl_ipforwarding, "I", "Enable IP forwarding between interfaces");
+
+static int ipsendredirects = 1; /* XXX */
+SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ipsendredirects, 0,
+ "Enable sending IP redirects");
+
+int ip_defttl = IPDEFTTL;
+SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ip_defttl, 0, "Maximum TTL on IP packets");
+
+static int ip_dosourceroute = 0;
+SYSCTL_INT(_net_inet_ip, IPCTL_SOURCEROUTE, sourceroute,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ip_dosourceroute, 0,
+ "Enable forwarding source routed IP packets");
+
+static int ip_acceptsourceroute = 0;
SYSCTL_INT(_net_inet_ip, IPCTL_ACCEPTSOURCEROUTE, accept_sourceroute,
- CTLFLAG_RW, &ip_acceptsourceroute, 0, "");
+ 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");
-static int ip_keepfaith = 0;
-SYSCTL_INT(_net_inet_ip, IPCTL_KEEPFAITH, keepfaith, CTLFLAG_RW,
- &ip_keepfaith, 0, "");
+SYSCTL_UINT(_net_inet_ip, OID_AUTO, fragpackets, CTLFLAG_RD | CTLFLAG_LOCKED,
+ &nipq, 0, "Current number of IPv4 fragment reassembly queue entries");
+
+SYSCTL_PROC(_net_inet_ip, OID_AUTO, maxfragsperpacket,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &maxfragsperpacket, 0,
+ sysctl_maxfragsperpacket, "I",
+ "Maximum number of IPv4 fragments allowed per packet");
+
+int ip_doscopedroute = 1;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, scopedroute, CTLFLAG_RD | CTLFLAG_LOCKED,
+ &ip_doscopedroute, 0, "Enable IPv4 scoped routing");
+
+static uint32_t ip_adj_clear_hwcksum = 0;
+SYSCTL_UINT(_net_inet_ip, OID_AUTO, adj_clear_hwcksum,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ip_adj_clear_hwcksum, 0,
+ "Invalidate hwcksum info when adjusting length");
+
+/*
+ * XXX - Setting ip_checkinterface mostly implements the receive side of
+ * the Strong ES model described in RFC 1122, but since the routing table
+ * and transmit implementation do not implement the Strong ES model,
+ * setting this to 1 results in an odd hybrid.
+ *
+ * XXX - ip_checkinterface currently must be disabled if you use ipnat
+ * to translate the destination address to another local interface.
+ *
+ * XXX - ip_checkinterface must be disabled if you add IP aliases
+ * to the loopback interface instead of the interface where the
+ * packets for those addresses are received.
+ */
+static int ip_checkinterface = 0;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, check_interface, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ip_checkinterface, 0, "Verify packet arrives on correct interface");
+
+static int ip_chaining = 1;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, rx_chaining, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ip_chaining, 1, "Do receive side ip address based chaining");
+
+static int ip_chainsz = 6;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, rx_chainsz, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ip_chainsz, 1, "IP receive side max chaining");
+
+static int ip_input_measure = 0;
+SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ip_input_measure, 0, sysctl_reset_ip_input_stats, "I", "Do time measurement");
+
+static uint64_t ip_input_measure_bins = 0;
+SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf_bins,
+ CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &ip_input_measure_bins, 0,
+ sysctl_ip_input_measure_bins, "I",
+ "bins for chaining performance data histogram");
+
+static net_perf_t net_perf;
+SYSCTL_PROC(_net_inet_ip, OID_AUTO, input_perf_data,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
+ 0, 0, sysctl_ip_input_getperf, "S,net_perf",
+ "IP input performance data (struct net_perf, net/net_perf.h)");
#if DIAGNOSTIC
-static int ipprintfs = 0;
+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_RD,
- &ipintrq.ifq_maxlen, 0, "");
-SYSCTL_INT(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops, CTLFLAG_RD,
- &ipintrq.ifq_drops, 0, "");
-struct ipstat ipstat;
-SYSCTL_STRUCT(_net_inet_ip, IPCTL_STATS, stats, CTLFLAG_RD,
- &ipstat, ipstat, "");
-
-/* 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 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;
-static struct ipq ipq[IPREASS_NHASH];
-static int nipq = 0; /* total # of reass queues */
-static int maxnipq;
+/* Protected by in_ifaddr_rwlock */
+struct in_ifaddrhead in_ifaddrhead; /* first inet address */
+struct in_ifaddrhashhead *in_ifaddrhashtbl; /* inet addr hash table */
-#if IPCTL_DEFMTU
-SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
- &ip_mtu, 0, "");
-#endif
+#define INADDR_NHASH 61
+static u_int32_t inaddr_nhash; /* hash table size */
+static u_int32_t inaddr_hashp; /* next largest prime */
-#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1
-#undef COMPAT_IPFW
-#define COMPAT_IPFW 1
-#else
-#undef COMPAT_IPFW
-#endif
+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 COMPAT_IPFW
+#if IPCTL_DEFMTU
+SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ip_mtu, 0, "Default MTU");
+#endif /* IPCTL_DEFMTU */
-#include <netinet/ip_fw.h>
+#if IPSTEALTH
+static int ipstealth = 0;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ipstealth, 0, "");
+#endif /* IPSTEALTH */
/* Firewall hooks */
+#if IPFIREWALL
ip_fw_chk_t *ip_fw_chk_ptr;
-ip_fw_ctl_t *ip_fw_ctl_ptr;
+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 */
+
+SYSCTL_NODE(_net_inet_ip, OID_AUTO, linklocal,
+ CTLFLAG_RW | CTLFLAG_LOCKED, 0, "link local");
+
+struct ip_linklocal_stat ip_linklocal_stat;
+SYSCTL_STRUCT(_net_inet_ip_linklocal, OID_AUTO, stat,
+ CTLFLAG_RD | CTLFLAG_LOCKED, &ip_linklocal_stat, ip_linklocal_stat,
+ "Number of link local packets with TTL less than 255");
+
+SYSCTL_NODE(_net_inet_ip_linklocal, OID_AUTO, in,
+ CTLFLAG_RW | CTLFLAG_LOCKED, 0, "link local input");
+
+int ip_linklocal_in_allowbadttl = 1;
+SYSCTL_INT(_net_inet_ip_linklocal_in, OID_AUTO, allowbadttl,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ip_linklocal_in_allowbadttl, 0,
+ "Allow incoming link local packets with TTL less than 255");
-/* IP Network Address Translation (NAT) hooks */
-ip_nat_t *ip_nat_ptr;
-ip_nat_ctl_t *ip_nat_ctl_ptr;
-#endif
/*
* We need to save the IP options in case a protocol wants to respond
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;
+static void in_ifaddrhashtbl_init(void);
+static void save_rte(u_char *, struct in_addr);
+static int ip_dooptions(struct mbuf *, int, struct sockaddr_in *);
+static void ip_forward(struct mbuf *, int, struct sockaddr_in *);
+static void frag_freef(struct ipqhead *, struct ipq *);
#if IPDIVERT
+#ifdef IPDIVERT_44
+static struct mbuf *ip_reass(struct mbuf *, u_int32_t *, u_int16_t *);
+#else /* !IPDIVERT_44 */
+static struct mbuf *ip_reass(struct mbuf *, u_int16_t *, u_int16_t *);
+#endif /* !IPDIVERT_44 */
+#else /* !IPDIVERT */
+static struct mbuf *ip_reass(struct mbuf *);
+#endif /* !IPDIVERT */
+static void ip_fwd_route_copyout(struct ifnet *, struct route *);
+static void ip_fwd_route_copyin(struct ifnet *, struct route *);
+static inline u_short ip_cksum(struct mbuf *, int);
+
+int ip_use_randomid = 1;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, random_id, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ip_use_randomid, 0, "Randomize IP packets IDs");
+
/*
- * Shared variable between ip_input() and ip_reass() to communicate
- * about which packets, once assembled from fragments, get diverted,
- * and to which port.
+ * 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.
*/
-static u_short frag_divert_port;
-#endif
-
-struct sockaddr_in *ip_fw_fwd_addr;
-
-static void save_rte __P((u_char *, struct in_addr));
-static int ip_dooptions __P((struct mbuf *));
-#ifndef NATPT
-static
-#endif
-void ip_forward __P((struct mbuf *, int));
-static void ip_freef __P((struct ipq *));
-static struct ip *
- ip_reass __P((struct mbuf *, struct ipq *, struct ipq *));
-static struct in_ifaddr *
- ip_rtaddr __P((struct in_addr));
-void ipintr __P((void));
-
-#if PM
-extern int doNatFil;
-extern int doRoute;
-
-extern int pm_in __P((struct ifnet *, struct ip *, struct mbuf *));
-extern struct route *pm_route __P((struct mbuf *));
-#endif
-
-#if defined(NATPT)
-extern int ip6_protocol_tr;
+#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__ */
-int natpt_in4 __P((struct mbuf *, struct mbuf **));
-
-#endif /* NATPT */
+/*
+ * GRE input handler function, settable via ip_gre_register_input() for PPTP.
+ */
+static gre_input_func_t gre_input_func;
/*
* IP initialization: fill in IP protocol switch table.
* All protocols not implemented in kernel go to raw IP protocol handler.
*/
void
-ip_init()
+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;
+
+ PE_parse_boot_argn("net.inet.ip.scopedroute",
+ &ip_doscopedroute, sizeof (ip_doscopedroute));
+
+ in_ifaddr_init();
+
+ in_ifaddr_rwlock_grp_attr = lck_grp_attr_alloc_init();
+ in_ifaddr_rwlock_grp = lck_grp_alloc_init("in_ifaddr_rwlock",
+ in_ifaddr_rwlock_grp_attr);
+ in_ifaddr_rwlock_attr = lck_attr_alloc_init();
+ lck_rw_init(in_ifaddr_rwlock, in_ifaddr_rwlock_grp,
+ in_ifaddr_rwlock_attr);
+
+ TAILQ_INIT(&in_ifaddrhead);
+ in_ifaddrhashtbl_init();
+
+ ip_moptions_init();
+
+ pr = pffindproto_locked(PF_INET, IPPROTO_RAW, SOCK_RAW);
+ if (pr == NULL) {
+ panic("%s: Unable to find [PF_INET,IPPROTO_RAW,SOCK_RAW]\n",
+ __func__);
+ /* NOTREACHED */
+ }
+
+ /* Initialize the entire ip_protox[] array to IPPROTO_RAW. */
+ for (i = 0; i < IPPROTO_MAX; i++)
+ ip_protox[i] = pr;
+ /*
+ * Cycle through IP protocols and put them into the appropriate place
+ * in ip_protox[], skipping protocols IPPROTO_{IP,RAW}.
+ */
+ VERIFY(dp == inetdomain && dp->dom_family == PF_INET);
+ TAILQ_FOREACH(pr, &dp->dom_protosw, pr_entry) {
+ VERIFY(pr->pr_domain == dp);
+ if (pr->pr_protocol != 0 && pr->pr_protocol != IPPROTO_RAW) {
+ /* Be careful to only index valid IP protocols. */
+ if (pr->pr_protocol < IPPROTO_MAX)
ip_protox[pr->pr_protocol] = pr;
}
- for (i = 0; i < IPREASS_NHASH; i++)
- ipq[i].next = ipq[i].prev = &ipq[i];
+ }
- maxnipq = nmbclusters/4;
+ /* IP fragment reassembly queue lock */
+ ipqlock_grp_attr = lck_grp_attr_alloc_init();
+ ipqlock_grp = lck_grp_alloc_init("ipqlock", ipqlock_grp_attr);
+ ipqlock_attr = lck_attr_alloc_init();
+ lck_mtx_init(&ipqlock, ipqlock_grp, ipqlock_attr);
+
+ lck_mtx_lock(&ipqlock);
+ /* Initialize IP reassembly queue. */
+ for (i = 0; i < IPREASS_NHASH; i++)
+ TAILQ_INIT(&ipq[i]);
+
+ maxnipq = nmbclusters / 32;
+ maxfragsperpacket = 128; /* enough for 64k in 512 byte fragments */
+ ipq_updateparams();
+ lck_mtx_unlock(&ipqlock);
+
+ getmicrotime(&tv);
+ ip_id = RandomULong() ^ tv.tv_usec;
+ ip_initid();
+
+ ipf_init();
+
+#if IPSEC
+ sadb_stat_mutex_grp_attr = lck_grp_attr_alloc_init();
+ sadb_stat_mutex_grp = lck_grp_alloc_init("sadb_stat",
+ sadb_stat_mutex_grp_attr);
+ sadb_stat_mutex_attr = lck_attr_alloc_init();
+ lck_mtx_init(sadb_stat_mutex, sadb_stat_mutex_grp,
+ sadb_stat_mutex_attr);
- ip_id = time_second & 0xffff;
- ipintrq.ifq_maxlen = ipqmaxlen;
-#if DUMMYNET
- ip_dn_init();
-#endif
-#if IPNAT
- ip_nat_init();
#endif
- ip_initialized = 1;
- }
+ arp_init();
}
-/* 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;
+/*
+ * Initialize IPv4 source address hash table.
+ */
+static void
+in_ifaddrhashtbl_init(void)
+{
+ int i, k, p;
+
+ if (in_ifaddrhashtbl != NULL)
+ return;
- if (!inetdomain_initted)
- { kprintf("Initing %d protosw entries\n", in_proto_count);
- dp = &inetdomain;
+ PE_parse_boot_argn("inaddr_nhash", &inaddr_nhash,
+ sizeof (inaddr_nhash));
+ if (inaddr_nhash == 0)
+ inaddr_nhash = INADDR_NHASH;
- for (i=0, pr = &inetsw[0]; i<in_proto_count; i++, pr++)
- net_add_proto(pr, dp);
- inetdomain_initted = 1;
+ 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;
}
-static struct sockaddr_in ipaddr = { sizeof(ipaddr), AF_INET };
-static struct route ipforward_rt;
+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);
+}
-/*
- * 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)
+ip_proto_dispatch_in_wrapper(struct mbuf *m, int hlen, u_int8_t proto)
+{
+ ip_proto_dispatch_in(m, hlen, proto, 0);
+}
+
+__private_extern__ void
+ip_proto_dispatch_in(struct mbuf *m, int hlen, u_int8_t proto,
+ ipfilter_t inject_ipfref)
{
+ struct ipfilter *filter;
+ int seen = (inject_ipfref == NULL);
+ int changed_header = 0;
struct ip *ip;
- struct ipq *fp;
- struct in_ifaddr *ia;
- int i, hlen, mff;
- u_short sum;
-#if !IPDIVERT /* dummy variable for the firewall code to play with */
- u_short ip_divert_cookie = 0 ;
-#endif
-#if COMPAT_IPFW
- struct ip_fw_chain *rule = NULL ;
-#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) {
- struct mbuf *m0 = m ;
- rule = (struct ip_fw_chain *)(m->m_data) ;
- m = m->m_next ;
- FREE(m0, M_IPFW);
- ip = mtod(m, struct ip *);
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
- goto iphack ;
- } else
- rule = NULL ;
-#endif
+ void (*pr_input)(struct mbuf *, int len);
+
+ if (!TAILQ_EMPTY(&ipv4_filters)) {
+ ipf_ref();
+ TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) {
+ if (seen == 0) {
+ if ((struct ipfilter *)inject_ipfref == filter)
+ seen = 1;
+ } else if (filter->ipf_filter.ipf_input) {
+ errno_t result;
+
+ if (changed_header == 0) {
+ /*
+ * Perform IP header alignment fixup,
+ * if needed, before passing packet
+ * into filter(s).
+ */
+ IP_HDR_ALIGNMENT_FIXUP(m,
+ m->m_pkthdr.rcvif, ipf_unref());
+
+ /* ipf_unref() already called */
+ if (m == NULL)
+ return;
+
+ changed_header = 1;
+ ip = mtod(m, struct ip *);
+ ip->ip_len = htons(ip->ip_len + hlen);
+ ip->ip_off = htons(ip->ip_off);
+ ip->ip_sum = 0;
+ ip->ip_sum = ip_cksum_hdr_in(m, hlen);
+ }
+ result = filter->ipf_filter.ipf_input(
+ filter->ipf_filter.cookie, (mbuf_t *)&m,
+ hlen, proto);
+ if (result == EJUSTRETURN) {
+ ipf_unref();
+ return;
+ }
+ if (result != 0) {
+ ipf_unref();
+ m_freem(m);
+ return;
+ }
+ }
+ }
+ ipf_unref();
+ }
+
+ /* Perform IP header alignment fixup (post-filters), if needed */
+ IP_HDR_ALIGNMENT_FIXUP(m, m->m_pkthdr.rcvif, return);
-#if DIAGNOSTIC
- if (m == NULL || (m->m_flags & M_PKTHDR) == 0)
- panic("ip_input no HDR");
-#endif
/*
- * If no IP addresses have been set yet but the interfaces
- * are receiving, can't do anything with incoming packets yet.
- * XXX This is broken! We should be able to receive broadcasts
- * and multicasts even without any local addresses configured.
+ * If there isn't a specific lock for the protocol
+ * we're about to call, use the generic lock for AF_INET.
+ * otherwise let the protocol deal with its own locking
*/
- if (TAILQ_EMPTY(&in_ifaddrhead))
- goto bad;
- ipstat.ips_total++;
+ ip = mtod(m, struct ip *);
- if (m->m_pkthdr.len < sizeof(struct ip))
- goto tooshort;
+ if (changed_header) {
+ ip->ip_len = ntohs(ip->ip_len) - hlen;
+ ip->ip_off = ntohs(ip->ip_off);
+ }
- if (m->m_len < sizeof (struct ip) &&
- (m = m_pullup(m, sizeof (struct ip))) == 0) {
- ipstat.ips_toosmall++;
- return;
+ 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);
}
- 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);
+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;
+};
- if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
- ipstat.ips_badvers++;
- goto bad;
- }
+typedef struct pktchain_elm pktchain_elm_t;
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
- if (hlen < sizeof(struct ip)) { /* minimum header length */
- ipstat.ips_badhlen++;
- goto bad;
- }
- if (hlen > m->m_len) {
- if ((m = m_pullup(m, hlen)) == 0) {
- ipstat.ips_badhlen++;
- return;
+/* 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);
}
- ip = mtod(m, struct ip *);
}
+ if (tbl[pkttbl_idx].pkte_tail != NULL)
+ mbuf_setnextpkt(tbl[pkttbl_idx].pkte_tail, packet);
- if (m->m_pkthdr.rcvif->if_hwassist == 0)
- m->m_pkthdr.csum_flags = 0;
+ tbl[pkttbl_idx].pkte_tail = packet;
+ tbl[pkttbl_idx].pkte_npkts += 1;
+ tbl[pkttbl_idx].pkte_nbytes += packet->m_pkthdr.len;
+ return (NULL);
+}
- if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
- sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
- } else
- sum = in_cksum(m, hlen);
+/* args is a dummy variable here for backward compatibility */
+static void
+ip_input_second_pass_loop_tbl(pktchain_elm_t *tbl, struct ip_fw_in_args *args)
+{
+ int i = 0;
+
+ for (i = 0; i < PKTTBL_SZ; i++) {
+ if (tbl[i].pkte_head != NULL) {
+ struct mbuf *m = tbl[i].pkte_head;
+ ip_input_second_pass(m, m->m_pkthdr.rcvif, 0,
+ tbl[i].pkte_npkts, tbl[i].pkte_nbytes, args, 0);
+
+ if (tbl[i].pkte_npkts > 2)
+ ipstat.ips_rxc_chainsz_gt2++;
+ if (tbl[i].pkte_npkts > 4)
+ ipstat.ips_rxc_chainsz_gt4++;
+
+ if (ip_input_measure)
+ net_perf_histogram(&net_perf, tbl[i].pkte_npkts);
+
+ tbl[i].pkte_head = tbl[i].pkte_tail = NULL;
+ tbl[i].pkte_npkts = 0;
+ tbl[i].pkte_nbytes = 0;
+ /* no need to initialize address and protocol in tbl */
+ }
+ }
+}
- if (sum) {
- ipstat.ips_badsum++;
- goto bad;
+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;
+}
- /*
- * Convert fields to host representation.
- */
- NTOHS(ip->ip_len);
- if (ip->ip_len < hlen) {
- ipstat.ips_badlen++;
- goto bad;
+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);
+ }
}
- NTOHS(ip->ip_id);
- NTOHS(ip->ip_off);
+}
- /*
- * 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:
- ipstat.ips_tooshort++;
- goto bad;
+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;
+ }
}
- if (m->m_pkthdr.len > ip->ip_len) {
- /* Invalidate hwcksuming */
- m->m_pkthdr.csum_flags = 0;
- m->m_pkthdr.csum_data = 0;
+}
- 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);
+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);
}
- /*
- * 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 <unimpl.>
- * - Encapsulate: put it in another IP and send out. <unimp.>
- */
+}
-#if defined(IPFIREWALL) && defined(DUMMYNET)
-iphack:
+/*
+ * First pass does all essential packet validation and places on a per flow
+ * queue for doing operations that have same outcome for all packets of a flow.
+ * div_info is packet divert/tee info
+ */
+static ipinput_chain_ret_t
+ip_input_first_pass(struct mbuf *m, u_int32_t *div_info,
+ struct ip_fw_in_args *args, int *ours, struct mbuf **modm)
+{
+ struct ip *ip;
+ struct ifnet *inifp;
+ unsigned int hlen;
+ int retval = IPINPUT_DOCHAIN;
+ int len = 0;
+ struct in_addr src_ip;
+#if IPFIREWALL
+ int i;
#endif
-#if COMPAT_IPFW
- if (ip_fw_chk_ptr) {
-#if IPFIREWALL_FORWARD
- /*
- * If we've been forwarded from the output side, then
- * skip the firewall a second time
- */
- if (ip_fw_fwd_addr)
- goto ours;
-#endif /* IPFIREWALL_FORWARD */
- i = (*ip_fw_chk_ptr)(&ip, hlen, NULL, &ip_divert_cookie,
- &m, &rule, &ip_fw_fwd_addr);
- /*
- * see the comment in ip_output for the return values
- * produced by the firewall.
- */
- if (!m) /* packet discarded by firewall */
- return ;
- if (i == 0 && ip_fw_fwd_addr == NULL) /* common case */
- goto pass ;
-#if DUMMYNET
- if (i & 0x10000) {
- /* send packet to the appropriate pipe */
- dummynet_io(i&0xffff,DN_TO_IP_IN,m,NULL,NULL,0, rule);
- return ;
- }
+#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
-#if IPDIVERT
- if (i > 0 && i < 0x10000) {
- /* Divert packet */
- frag_divert_port = i & 0xffff ;
- goto ours;
- }
+ ipfilter_t inject_filter_ref = NULL;
+
+#if !IPFIREWALL
+#pragma unused (args)
#endif
-#if IPFIREWALL_FORWARD
- if (i == 0 && ip_fw_fwd_addr != NULL)
- goto pass ;
+
+#if !IPDIVERT
+#pragma unused (div_info)
+#pragma unused (ours)
#endif
- /*
- * if we get here, the packet must be dropped
- */
- m_freem(m);
- return;
- }
-pass:
- if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, m->m_pkthdr.rcvif, IP_NAT_IN)) {
-#if IPFIREWALL_FORWARD
- ip_fw_fwd_addr = NULL;
+#if !IPFIREWALL_FORWARD
+#pragma unused (ours)
#endif
- return;
- }
-#endif /* !COMPAT_IPFW */
-#if defined(PM)
- /*
- * Process ip-filter/NAT.
- * Return TRUE if this packed is discarded.
- * Return FALSE if this packed is accepted.
- */
+ /* 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);
- if (doNatFil && pm_in(m->m_pkthdr.rcvif, ip, m))
- return;
-#endif
+ /* 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
-#if defined(NATPT)
/*
- *
+ * Don't bother searching for tag(s) if there's none.
*/
- if (ip6_protocol_tr)
- {
- struct mbuf *m1 = NULL;
-
- switch (natpt_in4(m, &m1))
- {
- case IPPROTO_IP: goto dooptions;
- case IPPROTO_IPV4: ip_forward(m1, 0); break;
- case IPPROTO_IPV6: ip6_forward(m1, 1); break;
- case IPPROTO_MAX: /* discard this packet */
- default:
- }
-
- if (m != m1)
- m_freem(m);
+ if (SLIST_EMPTY(&m->m_pkthdr.tags))
+ goto ipfw_tags_done;
- return;
+ /* Grab info from mtags prepended to the chain */
+ p = m_tag_first(m);
+ while (p) {
+ if (p->m_tag_id == KERNEL_MODULE_TAG_ID) {
+#if DUMMYNET
+ if (p->m_tag_type == KERNEL_TAG_TYPE_DUMMYNET) {
+ struct dn_pkt_tag *dn_tag;
+
+ dn_tag = (struct dn_pkt_tag *)(p+1);
+ args->fwai_ipfw_rule = dn_tag->dn_ipfw_rule;
+ args->fwai_pf_rule = dn_tag->dn_pf_rule;
+ delete = TRUE;
+ }
+#endif
+
+#if IPDIVERT
+ if (p->m_tag_type == KERNEL_TAG_TYPE_DIVERT) {
+ struct divert_tag *div_tag;
+
+ div_tag = (struct divert_tag *)(p+1);
+ args->fwai_divert_rule = div_tag->cookie;
+ delete = TRUE;
+ }
+#endif
+
+ if (p->m_tag_type == KERNEL_TAG_TYPE_IPFORWARD) {
+ struct ip_fwd_tag *ipfwd_tag;
+
+ ipfwd_tag = (struct ip_fwd_tag *)(p+1);
+ args->fwai_next_hop = ipfwd_tag->next_hop;
+ delete = TRUE;
+ }
+
+ if (delete) {
+ copy = p;
+ p = m_tag_next(m, p);
+ m_tag_delete(m, copy);
+ } else {
+ p = m_tag_next(m, p);
+ }
+ } else {
+ p = m_tag_next(m, p);
+ }
+ }
+
+#if DIAGNOSTIC
+ if (m == NULL || !(m->m_flags & M_PKTHDR))
+ panic("ip_input no HDR");
+#endif
+
+#if DUMMYNET
+ if (args->fwai_ipfw_rule || args->fwai_pf_rule) {
+ /* dummynet already filtered us */
+ ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ inject_filter_ref = ipf_get_inject_filter(m);
+#if IPFIREWALL
+ if (args->fwai_ipfw_rule)
+ goto iphack;
+#endif /* IPFIREWALL */
+ if (args->fwai_pf_rule)
+ goto check_with_pf;
+ }
+#endif /* DUMMYNET */
+ipfw_tags_done:
+#endif /* IPFIREWALL || DUMMYNET */
+
+ /*
+ * No need to process packet twice if we've already seen it.
+ */
+ if (!SLIST_EMPTY(&m->m_pkthdr.tags))
+ inject_filter_ref = ipf_get_inject_filter(m);
+ if (inject_filter_ref != NULL) {
+ ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+
+ DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL,
+ struct ip *, ip, struct ifnet *, inifp,
+ struct ip *, ip, struct ip6_hdr *, NULL);
+
+ ip->ip_len = ntohs(ip->ip_len) - hlen;
+ ip->ip_off = ntohs(ip->ip_off);
+ ip_proto_dispatch_in(m, hlen, ip->ip_p, inject_filter_ref);
+ return (IPINPUT_DONE);
+ }
+
+ if (m->m_pkthdr.len < sizeof (struct ip)) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ OSAddAtomic(1, &ipstat.ips_tooshort);
+ m_freem(m);
+ return (IPINPUT_FREED);
+ }
+
+ if (m->m_len < sizeof (struct ip) &&
+ (m = m_pullup(m, sizeof (struct ip))) == NULL) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ OSAddAtomic(1, &ipstat.ips_toosmall);
+ return (IPINPUT_FREED);
+ }
+
+ ip = mtod(m, struct ip *);
+ *modm = m;
+
+ KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr, ip->ip_src.s_addr,
+ ip->ip_p, ip->ip_off, ip->ip_len);
+
+ if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ OSAddAtomic(1, &ipstat.ips_badvers);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+ return (IPINPUT_FREED);
+ }
+
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ if (hlen < sizeof (struct ip)) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ OSAddAtomic(1, &ipstat.ips_badhlen);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+ return (IPINPUT_FREED);
+ }
+
+ if (hlen > m->m_len) {
+ if ((m = m_pullup(m, hlen)) == NULL) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ OSAddAtomic(1, &ipstat.ips_badhlen);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ return (IPINPUT_FREED);
+ }
+ ip = mtod(m, struct ip *);
+ *modm = m;
+ }
+
+ /* 127/8 must not appear on wire - RFC1122 */
+ if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
+ (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
+ /*
+ * Allow for the following exceptions:
+ *
+ * 1. If the packet was sent to loopback (i.e. rcvif
+ * would have been set earlier at output time.)
+ *
+ * 2. If the packet was sent out on loopback from a local
+ * source address which belongs to a non-loopback
+ * interface (i.e. rcvif may not necessarily be a
+ * loopback interface, hence the test for PKTF_LOOP.)
+ * Unlike IPv6, there is no interface scope ID, and
+ * therefore we don't care so much about PKTF_IFINFO.
+ */
+ if (!(inifp->if_flags & IFF_LOOPBACK) &&
+ !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ OSAddAtomic(1, &ipstat.ips_badaddr);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+ return (IPINPUT_FREED);
+ }
+ }
+
+ /* IPv4 Link-Local Addresses as defined in RFC3927 */
+ if ((IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) ||
+ IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)))) {
+ ip_linklocal_stat.iplls_in_total++;
+ if (ip->ip_ttl != MAXTTL) {
+ OSAddAtomic(1, &ip_linklocal_stat.iplls_in_badttl);
+ /* Silently drop link local traffic with bad TTL */
+ if (!ip_linklocal_in_allowbadttl) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+ return (IPINPUT_FREED);
+ }
+ }
+ }
+
+ if (ip_cksum(m, hlen)) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+ return (IPINPUT_FREED);
+ }
+
+ DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL,
+ struct ip *, ip, struct ifnet *, inifp,
+ struct ip *, ip, struct ip6_hdr *, NULL);
+
+ /*
+ * Convert fields to host representation.
+ */
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_len);
+#endif
+
+ if (ip->ip_len < hlen) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ OSAddAtomic(1, &ipstat.ips_badlen);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+ return (IPINPUT_FREED);
+ }
+
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_off);
+#endif
+
+ /*
+ * Check that the amount of data in the buffers
+ * is as at least much as the IP header would have us expect.
+ * Trim mbufs if longer than we expect.
+ * Drop packet if shorter than we expect.
+ */
+ if (m->m_pkthdr.len < ip->ip_len) {
+ OSAddAtomic(1, &ipstat.ips_total);
+ OSAddAtomic(1, &ipstat.ips_tooshort);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+ return (IPINPUT_FREED);
+ }
+
+ if (m->m_pkthdr.len > ip->ip_len) {
+ /*
+ * Invalidate hardware checksum info if ip_adj_clear_hwcksum
+ * is set; useful to handle buggy drivers. Note that this
+ * should not be enabled by default, as we may get here due
+ * to link-layer padding.
+ */
+ if (ip_adj_clear_hwcksum &&
+ (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
+ !(inifp->if_flags & IFF_LOOPBACK) &&
+ !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) {
+ m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID;
+ m->m_pkthdr.csum_data = 0;
+ ipstat.ips_adj_hwcsum_clr++;
+ }
+
+ ipstat.ips_adj++;
+ if (m->m_len == m->m_pkthdr.len) {
+ m->m_len = ip->ip_len;
+ m->m_pkthdr.len = ip->ip_len;
+ } else
+ m_adj(m, ip->ip_len - m->m_pkthdr.len);
+ }
+
+ /* for consistency */
+ m->m_pkthdr.pkt_proto = ip->ip_p;
+
+ /* for netstat route statistics */
+ src_ip = ip->ip_src;
+ len = m->m_pkthdr.len;
+
+#if DUMMYNET
+check_with_pf:
+#endif
+#if PF
+ /* Invoke inbound packet filter */
+ if (PF_IS_ENABLED) {
+ int error;
+ ip_input_cpout_args(args, &args1, &init);
+
+#if DUMMYNET
+ error = pf_af_hook(inifp, NULL, &m, AF_INET, TRUE, &args1);
+#else
+ error = pf_af_hook(inifp, NULL, &m, AF_INET, TRUE, NULL);
+#endif /* DUMMYNET */
+ if (error != 0 || m == NULL) {
+ if (m != NULL) {
+ panic("%s: unexpected packet %p\n",
+ __func__, m);
+ /* NOTREACHED */
+ }
+ /* Already freed by callee */
+ ip_input_update_nstat(inifp, src_ip, 1, len);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ OSAddAtomic(1, &ipstat.ips_total);
+ return (IPINPUT_FREED);
+ }
+ ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ *modm = m;
+ ip_input_cpin_args(&args1, args);
+ }
+#endif /* PF */
+
+#if IPSEC
+ if (ipsec_bypass == 0 && ipsec_gethist(m, NULL)) {
+ retval = IPINPUT_DONTCHAIN; /* XXX scope for chaining here? */
+ goto pass;
+ }
+#endif
+
+#if IPFIREWALL
+#if DUMMYNET
+iphack:
+#endif /* DUMMYNET */
+ /*
+ * Check if we want to allow this packet to be processed.
+ * Consider it to be bad if not.
+ */
+ if (fw_enable && IPFW_LOADED) {
+#if IPFIREWALL_FORWARD
+ /*
+ * If we've been forwarded from the output side, then
+ * skip the firewall a second time
+ */
+ if (args->fwai_next_hop) {
+ *ours = 1;
+ return (IPINPUT_DONTCHAIN);
+ }
+#endif /* IPFIREWALL_FORWARD */
+ ip_input_cpout_args(args, &args1, &init);
+ args1.fwa_m = m;
+
+ i = ip_fw_chk_ptr(&args1);
+ m = args1.fwa_m;
+
+ if ((i & IP_FW_PORT_DENY_FLAG) || m == NULL) { /* drop */
+ if (m)
+ m_freem(m);
+ ip_input_update_nstat(inifp, src_ip, 1, len);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ OSAddAtomic(1, &ipstat.ips_total);
+ return (IPINPUT_FREED);
+ }
+ ip = mtod(m, struct ip *); /* just in case m changed */
+ *modm = m;
+ ip_input_cpin_args(&args1, args);
+
+ if (i == 0 && args->fwai_next_hop == NULL) { /* common case */
+ goto pass;
+ }
+#if DUMMYNET
+ if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG) != 0) {
+ /* Send packet to the appropriate pipe */
+ ip_dn_io_ptr(m, i&0xffff, DN_TO_IP_IN, &args1,
+ DN_CLIENT_IPFW);
+ ip_input_update_nstat(inifp, src_ip, 1, len);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ OSAddAtomic(1, &ipstat.ips_total);
+ return (IPINPUT_FREED);
+ }
+#endif /* DUMMYNET */
+#if IPDIVERT
+ if (i != 0 && (i & IP_FW_PORT_DYNT_FLAG) == 0) {
+ /* Divert or tee packet */
+ *div_info = i;
+ *ours = 1;
+ return (IPINPUT_DONTCHAIN);
+ }
+#endif
+#if IPFIREWALL_FORWARD
+ if (i == 0 && args->fwai_next_hop != NULL) {
+ retval = IPINPUT_DONTCHAIN;
+ goto pass;
+ }
+#endif
+ /*
+ * if we get here, the packet must be dropped
+ */
+ ip_input_update_nstat(inifp, src_ip, 1, len);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+ OSAddAtomic(1, &ipstat.ips_total);
+ return (IPINPUT_FREED);
+ }
+#endif /* IPFIREWALL */
+#if IPSEC | IPFIREWALL
+pass:
+#endif
+ /*
+ * Process options and, if not destined for us,
+ * ship it on. ip_dooptions returns 1 when an
+ * error was detected (causing an icmp message
+ * to be sent and the original packet to be freed).
+ */
+ ip_nhops = 0; /* for source routed packets */
+#if IPFIREWALL
+ if (hlen > sizeof (struct ip) &&
+ ip_dooptions(m, 0, args->fwai_next_hop)) {
+#else /* !IPFIREWALL */
+ if (hlen > sizeof (struct ip) && ip_dooptions(m, 0, NULL)) {
+#endif /* !IPFIREWALL */
+ ip_input_update_nstat(inifp, src_ip, 1, len);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ OSAddAtomic(1, &ipstat.ips_total);
+ return (IPINPUT_FREED);
+ }
+
+ /*
+ * Don't chain fragmented packets as the process of determining
+ * if it is our fragment or someone else's plus the complexity of
+ * divert and fw args makes it harder to do chaining.
+ */
+ if (ip->ip_off & ~(IP_DF | IP_RF))
+ return (IPINPUT_DONTCHAIN);
+
+ /* Allow DHCP/BootP responses through */
+ if ((inifp->if_eflags & IFEF_AUTOCONFIGURING) &&
+ hlen == sizeof (struct ip) && ip->ip_p == IPPROTO_UDP) {
+ struct udpiphdr *ui;
+
+ if (m->m_len < sizeof (struct udpiphdr) &&
+ (m = m_pullup(m, sizeof (struct udpiphdr))) == NULL) {
+ OSAddAtomic(1, &udpstat.udps_hdrops);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ OSAddAtomic(1, &ipstat.ips_total);
+ return (IPINPUT_FREED);
+ }
+ *modm = m;
+ ui = mtod(m, struct udpiphdr *);
+ if (ntohs(ui->ui_dport) == IPPORT_BOOTPC) {
+ ip_setdstifaddr_info(m, inifp->if_index, NULL);
+ return (IPINPUT_DONTCHAIN);
+ }
+ }
+
+ /* Avoid chaining raw sockets as ipsec checks occur later for them */
+ if (ip_protox[ip->ip_p]->pr_flags & PR_LASTHDR)
+ return (IPINPUT_DONTCHAIN);
+
+ return (retval);
+#if !defined(__i386__) && !defined(__x86_64__)
+bad:
+ m_freem(m);
+ return (IPINPUT_FREED);
+#endif
+}
+
+static void
+ip_input_second_pass(struct mbuf *m, struct ifnet *inifp, u_int32_t div_info,
+ int npkts_in_chain, int bytes_in_chain, struct ip_fw_in_args *args, int ours)
+{
+ unsigned int checkif;
+ struct mbuf *tmp_mbuf = NULL;
+ struct in_ifaddr *ia = NULL;
+ struct in_addr pkt_dst;
+ unsigned int hlen;
+
+#if !IPFIREWALL
+#pragma unused (args)
+#endif
+
+#if !IPDIVERT
+#pragma unused (div_info)
+#endif
+
+ struct ip *ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+
+ OSAddAtomic(npkts_in_chain, &ipstat.ips_total);
+
+ /*
+ * Naively assume we can attribute inbound data to the route we would
+ * use to send to this destination. Asymmetric routing breaks this
+ * assumption, but it still allows us to account for traffic from
+ * a remote node in the routing table.
+ * this has a very significant performance impact so we bypass
+ * if nstat_collect is disabled. We may also bypass if the
+ * protocol is tcp in the future because tcp will have a route that
+ * we can use to attribute the data to. That does mean we would not
+ * account for forwarded tcp traffic.
+ */
+ ip_input_update_nstat(inifp, ip->ip_src, npkts_in_chain,
+ bytes_in_chain);
+
+ if (ours)
+ goto ours;
+
+ /*
+ * Check our list of addresses, to see if the packet is for us.
+ * If we don't have any addresses, assume any unicast packet
+ * we receive might be for us (and let the upper layers deal
+ * with it).
+ */
+ tmp_mbuf = m;
+ if (TAILQ_EMPTY(&in_ifaddrhead)) {
+ while (tmp_mbuf) {
+ if (!(tmp_mbuf->m_flags & (M_MCAST|M_BCAST))) {
+ ip_setdstifaddr_info(tmp_mbuf, inifp->if_index,
+ NULL);
+ }
+ tmp_mbuf = mbuf_nextpkt(tmp_mbuf);
+ }
+ goto ours;
+ }
+ /*
+ * Cache the destination address of the packet; this may be
+ * changed by use of 'ipfw fwd'.
+ */
+#if IPFIREWALL
+ pkt_dst = args->fwai_next_hop == NULL ?
+ ip->ip_dst : args->fwai_next_hop->sin_addr;
+#else /* !IPFIREWALL */
+ pkt_dst = ip->ip_dst;
+#endif /* !IPFIREWALL */
+
+ /*
+ * Enable a consistency check between the destination address
+ * and the arrival interface for a unicast packet (the RFC 1122
+ * strong ES model) if IP forwarding is disabled and the packet
+ * is not locally generated and the packet is not subject to
+ * 'ipfw fwd'.
+ *
+ * XXX - Checking also should be disabled if the destination
+ * address is ipnat'ed to a different interface.
+ *
+ * XXX - Checking is incompatible with IP aliases added
+ * to the loopback interface instead of the interface where
+ * the packets are received.
+ */
+ checkif = ip_checkinterface && (ipforwarding == 0) &&
+ !(inifp->if_flags & IFF_LOOPBACK) &&
+ !(m->m_pkthdr.pkt_flags & PKTF_LOOP)
+#if IPFIREWALL
+ && (args->fwai_next_hop == NULL);
+#else /* !IPFIREWALL */
+ ;
+#endif /* !IPFIREWALL */
+
+ /*
+ * Check for exact addresses in the hash bucket.
+ */
+ lck_rw_lock_shared(in_ifaddr_rwlock);
+ TAILQ_FOREACH(ia, INADDR_HASH(pkt_dst.s_addr), ia_hash) {
+ /*
+ * If the address matches, verify that the packet
+ * arrived via the correct interface if checking is
+ * enabled.
+ */
+ if (IA_SIN(ia)->sin_addr.s_addr == pkt_dst.s_addr &&
+ (!checkif || ia->ia_ifp == inifp)) {
+ ip_input_setdst_chain(m, 0, ia);
+ lck_rw_done(in_ifaddr_rwlock);
+ goto ours;
+ }
+ }
+ lck_rw_done(in_ifaddr_rwlock);
+
+ /*
+ * Check for broadcast addresses.
+ *
+ * Only accept broadcast packets that arrive via the matching
+ * interface. Reception of forwarded directed broadcasts would be
+ * handled via ip_forward() and ether_frameout() with the loopback
+ * into the stack for SIMPLEX interfaces handled by ether_frameout().
+ */
+ if (inifp->if_flags & IFF_BROADCAST) {
+ struct ifaddr *ifa;
+
+ ifnet_lock_shared(inifp);
+ TAILQ_FOREACH(ifa, &inifp->if_addrhead, ifa_link) {
+ if (ifa->ifa_addr->sa_family != AF_INET) {
+ continue;
+ }
+ ia = ifatoia(ifa);
+ if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
+ pkt_dst.s_addr || ia->ia_netbroadcast.s_addr ==
+ pkt_dst.s_addr) {
+ ip_input_setdst_chain(m, 0, ia);
+ ifnet_lock_done(inifp);
+ goto ours;
+ }
+ }
+ ifnet_lock_done(inifp);
+ }
+
+ if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
+ struct in_multi *inm;
+ /*
+ * See if we belong to the destination multicast group on the
+ * arrival interface.
+ */
+ in_multihead_lock_shared();
+ IN_LOOKUP_MULTI(&ip->ip_dst, inifp, inm);
+ in_multihead_lock_done();
+ if (inm == NULL) {
+ OSAddAtomic(npkts_in_chain, &ipstat.ips_notmember);
+ m_freem_list(m);
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ return;
+ }
+ ip_input_setdst_chain(m, inifp->if_index, NULL);
+ INM_REMREF(inm);
+ goto ours;
+ }
+
+ if (ip->ip_dst.s_addr == (u_int32_t)INADDR_BROADCAST ||
+ ip->ip_dst.s_addr == INADDR_ANY) {
+ ip_input_setdst_chain(m, inifp->if_index, NULL);
+ goto ours;
+ }
+
+ if (ip->ip_p == IPPROTO_UDP) {
+ struct udpiphdr *ui;
+ ui = mtod(m, struct udpiphdr *);
+ if (ntohs(ui->ui_dport) == IPPORT_BOOTPC) {
+ goto ours;
+ }
+ }
+
+ tmp_mbuf = m;
+ struct mbuf *nxt_mbuf = NULL;
+ while (tmp_mbuf) {
+ nxt_mbuf = mbuf_nextpkt(tmp_mbuf);
+ /*
+ * Not for us; forward if possible and desirable.
+ */
+ mbuf_setnextpkt(tmp_mbuf, NULL);
+ if (ipforwarding == 0) {
+ OSAddAtomic(1, &ipstat.ips_cantforward);
+ m_freem(tmp_mbuf);
+ } else {
+#if IPFIREWALL
+ ip_forward(tmp_mbuf, 0, args->fwai_next_hop);
+#else
+ ip_forward(tmp_mbuf, 0, NULL);
+#endif
+ }
+ tmp_mbuf = nxt_mbuf;
+ }
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ return;
+ours:
+ /*
+ * If offset or IP_MF are set, must reassemble.
+ */
+ if (ip->ip_off & ~(IP_DF | IP_RF)) {
+ VERIFY(npkts_in_chain == 1);
+ /*
+ * ip_reass() will return a different mbuf, and update
+ * the divert info in div_info and args->fwai_divert_rule.
+ */
+#if IPDIVERT
+ m = ip_reass(m, (u_int16_t *)&div_info, &args->fwai_divert_rule);
+#else
+ m = ip_reass(m);
+#endif
+ if (m == NULL)
+ return;
+ ip = mtod(m, struct ip *);
+ /* Get the header length of the reassembled packet */
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+#if IPDIVERT
+ /* Restore original checksum before diverting packet */
+ if (div_info != 0) {
+ VERIFY(npkts_in_chain == 1);
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+ ip->ip_sum = 0;
+ ip->ip_sum = ip_cksum_hdr_in(m, hlen);
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_off);
+ NTOHS(ip->ip_len);
+#endif
+ }
+#endif
+ }
+
+ /*
+ * Further protocols expect the packet length to be w/o the
+ * IP header.
+ */
+ ip->ip_len -= hlen;
+
+#if IPDIVERT
+ /*
+ * Divert or tee packet to the divert protocol if required.
+ *
+ * If div_info is zero then cookie should be too, so we shouldn't
+ * need to clear them here. Assume divert_packet() does so also.
+ */
+ if (div_info != 0) {
+ struct mbuf *clone = NULL;
+ VERIFY(npkts_in_chain == 1);
+
+ /* Clone packet if we're doing a 'tee' */
+ if (div_info & IP_FW_PORT_TEE_FLAG)
+ clone = m_dup(m, M_DONTWAIT);
+
+ /* Restore packet header fields to original values */
+ ip->ip_len += hlen;
+
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+ /* Deliver packet to divert input routine */
+ OSAddAtomic(1, &ipstat.ips_delivered);
+ divert_packet(m, 1, div_info & 0xffff, args->fwai_divert_rule);
+
+ /* If 'tee', continue with original packet */
+ if (clone == NULL) {
+ return;
+ }
+ m = clone;
+ ip = mtod(m, struct ip *);
+ }
+#endif
+
+#if IPSEC
+ /*
+ * enforce IPsec policy checking if we are seeing last header.
+ * note that we do not visit this with protocols with pcb layer
+ * code - like udp/tcp/raw ip.
+ */
+ if (ipsec_bypass == 0 && (ip_protox[ip->ip_p]->pr_flags & PR_LASTHDR)) {
+ VERIFY(npkts_in_chain == 1);
+ if (ipsec4_in_reject(m, NULL)) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_polvio);
+ goto bad;
+ }
+ }
+#endif /* IPSEC */
+
+ /*
+ * Switch out to protocol's input routine.
+ */
+ OSAddAtomic(npkts_in_chain, &ipstat.ips_delivered);
+
+#if IPFIREWALL
+ if (args->fwai_next_hop && ip->ip_p == IPPROTO_TCP) {
+ /* TCP needs IPFORWARD info if available */
+ struct m_tag *fwd_tag;
+ struct ip_fwd_tag *ipfwd_tag;
+
+ VERIFY(npkts_in_chain == 1);
+ fwd_tag = m_tag_create(KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_IPFORWARD, sizeof (*ipfwd_tag),
+ M_NOWAIT, m);
+ if (fwd_tag == NULL)
+ goto bad;
+
+ ipfwd_tag = (struct ip_fwd_tag *)(fwd_tag+1);
+ ipfwd_tag->next_hop = args->fwai_next_hop;
+
+ m_tag_prepend(m, fwd_tag);
+
+ KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr,
+ ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
+
+ /* TCP deals with its own locking */
+ ip_proto_dispatch_in(m, hlen, ip->ip_p, 0);
+ } else {
+ KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr,
+ ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
+
+ ip_input_dispatch_chain(m);
+
+ }
+#else /* !IPFIREWALL */
+ ip_input_dispatch_chain(m);
+
+#endif /* !IPFIREWALL */
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ return;
+bad:
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+}
+
+void
+ip_input_process_list(struct mbuf *packet_list)
+{
+ pktchain_elm_t pktchain_tbl[PKTTBL_SZ];
+
+ struct mbuf *packet = NULL;
+ struct mbuf *modm = NULL; /* modified mbuf */
+ int retval = 0;
+ u_int32_t div_info = 0;
+ int ours = 0;
+ struct timeval start_tv;
+ int num_pkts = 0;
+ int chain = 0;
+ struct ip_fw_in_args args;
+
+ if (ip_chaining == 0) {
+ struct mbuf *m = packet_list;
+ if (ip_input_measure)
+ net_perf_start_time(&net_perf, &start_tv);
+ while (m) {
+ packet_list = mbuf_nextpkt(m);
+ mbuf_setnextpkt(m, NULL);
+ ip_input(m);
+ m = packet_list;
+ num_pkts++;
+ }
+ if (ip_input_measure)
+ net_perf_measure_time(&net_perf, &start_tv, num_pkts);
+ return;
+ }
+ if (ip_input_measure)
+ net_perf_start_time(&net_perf, &start_tv);
+
+ bzero(&pktchain_tbl, sizeof(pktchain_tbl));
+restart_list_process:
+ chain = 0;
+ for (packet = packet_list; packet; packet = packet_list) {
+ packet_list = mbuf_nextpkt(packet);
+ mbuf_setnextpkt(packet, NULL);
+
+ num_pkts++;
+ modm = NULL;
+ div_info = 0;
+ bzero(&args, sizeof (args));
+
+ retval = ip_input_first_pass(packet, &div_info, &args,
+ &ours, &modm);
+
+ if (retval == IPINPUT_DOCHAIN) {
+ if (modm)
+ packet = modm;
+ packet = ip_chain_insert(packet, &pktchain_tbl[0]);
+ if (packet == NULL) {
+ ipstat.ips_rxc_chained++;
+ chain++;
+ if (chain > ip_chainsz)
+ break;
+ } else {
+ ipstat.ips_rxc_collisions++;
+ break;
+ }
+ } else if (retval == IPINPUT_DONTCHAIN) {
+ /* in order to preserve order, exit from chaining */
+ if (modm)
+ packet = modm;
+ ipstat.ips_rxc_notchain++;
+ break;
+ } else {
+ /* packet was freed or delivered, do nothing. */
+ }
+ }
+
+ /* do second pass here for pktchain_tbl */
+ if (chain)
+ ip_input_second_pass_loop_tbl(&pktchain_tbl[0], &args);
+
+ if (packet) {
+ /*
+ * equivalent update in chaining case if performed in
+ * ip_input_second_pass_loop_tbl().
+ */
+ if (ip_input_measure)
+ net_perf_histogram(&net_perf, 1);
+
+ ip_input_second_pass(packet, packet->m_pkthdr.rcvif, div_info,
+ 1, packet->m_pkthdr.len, &args, ours);
+ }
+
+ if (packet_list)
+ goto restart_list_process;
+
+ if (ip_input_measure)
+ net_perf_measure_time(&net_perf, &start_tv, num_pkts);
+}
+/*
+ * Ip input routine. Checksum and byte swap header. If fragmented
+ * try to reassemble. Process options. Pass to next level.
+ */
+void
+ip_input(struct mbuf *m)
+{
+ struct ip *ip;
+ struct in_ifaddr *ia = NULL;
+ unsigned int hlen, checkif;
+ u_short sum = 0;
+ struct in_addr pkt_dst;
+#if IPFIREWALL
+ int i;
+ u_int32_t div_info = 0; /* packet divert/tee info */
+#endif
+#if IPFIREWALL || DUMMYNET
+ struct ip_fw_args args;
+ struct m_tag *tag;
+#endif
+ ipfilter_t inject_filter_ref = NULL;
+ struct ifnet *inifp;
+
+ /* Check if the mbuf is still valid after interface filter processing */
+ MBUF_INPUT_CHECK(m, m->m_pkthdr.rcvif);
+ inifp = m->m_pkthdr.rcvif;
+ VERIFY(inifp != NULL);
+
+ ipstat.ips_rxc_notlist++;
+
+ /* Perform IP header alignment fixup, if needed */
+ IP_HDR_ALIGNMENT_FIXUP(m, inifp, goto bad);
+
+ m->m_pkthdr.pkt_flags &= ~PKTF_FORWARDED;
+
+#if IPFIREWALL || DUMMYNET
+ bzero(&args, sizeof (struct ip_fw_args));
+
+ /*
+ * Don't bother searching for tag(s) if there's none.
+ */
+ if (SLIST_EMPTY(&m->m_pkthdr.tags))
+ goto ipfw_tags_done;
+
+ /* Grab info from mtags prepended to the chain */
+#if DUMMYNET
+ if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) {
+ struct dn_pkt_tag *dn_tag;
+
+ dn_tag = (struct dn_pkt_tag *)(tag+1);
+ args.fwa_ipfw_rule = dn_tag->dn_ipfw_rule;
+ args.fwa_pf_rule = dn_tag->dn_pf_rule;
+
+ m_tag_delete(m, tag);
+ }
+#endif /* DUMMYNET */
+
+#if IPDIVERT
+ if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_DIVERT, NULL)) != NULL) {
+ struct divert_tag *div_tag;
+
+ div_tag = (struct divert_tag *)(tag+1);
+ args.fwa_divert_rule = div_tag->cookie;
+
+ m_tag_delete(m, tag);
+ }
+#endif
+
+ if ((tag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_IPFORWARD, NULL)) != NULL) {
+ struct ip_fwd_tag *ipfwd_tag;
+
+ ipfwd_tag = (struct ip_fwd_tag *)(tag+1);
+ args.fwa_next_hop = ipfwd_tag->next_hop;
+
+ m_tag_delete(m, tag);
+ }
+
+#if DIAGNOSTIC
+ if (m == NULL || !(m->m_flags & M_PKTHDR))
+ panic("ip_input no HDR");
+#endif
+
+#if DUMMYNET
+ if (args.fwa_ipfw_rule || args.fwa_pf_rule) {
+ /* dummynet already filtered us */
+ ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ inject_filter_ref = ipf_get_inject_filter(m);
+#if IPFIREWALL
+ if (args.fwa_ipfw_rule)
+ goto iphack;
+#endif /* IPFIREWALL */
+ if (args.fwa_pf_rule)
+ goto check_with_pf;
+ }
+#endif /* DUMMYNET */
+ipfw_tags_done:
+#endif /* IPFIREWALL || DUMMYNET */
+
+ /*
+ * No need to process packet twice if we've already seen it.
+ */
+ if (!SLIST_EMPTY(&m->m_pkthdr.tags))
+ inject_filter_ref = ipf_get_inject_filter(m);
+ if (inject_filter_ref != NULL) {
+ ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+
+ DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL,
+ struct ip *, ip, struct ifnet *, inifp,
+ struct ip *, ip, struct ip6_hdr *, NULL);
+
+ ip->ip_len = ntohs(ip->ip_len) - hlen;
+ ip->ip_off = ntohs(ip->ip_off);
+ ip_proto_dispatch_in(m, hlen, ip->ip_p, inject_filter_ref);
+ return;
+ }
+
+ OSAddAtomic(1, &ipstat.ips_total);
+ if (m->m_pkthdr.len < sizeof (struct ip))
+ goto tooshort;
+
+ if (m->m_len < sizeof (struct ip) &&
+ (m = m_pullup(m, sizeof (struct ip))) == NULL) {
+ OSAddAtomic(1, &ipstat.ips_toosmall);
+ return;
+ }
+ ip = mtod(m, struct ip *);
+
+ KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr, ip->ip_src.s_addr,
+ ip->ip_p, ip->ip_off, ip->ip_len);
+
+ if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
+ OSAddAtomic(1, &ipstat.ips_badvers);
+ goto bad;
+ }
+
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ if (hlen < sizeof (struct ip)) { /* minimum header length */
+ OSAddAtomic(1, &ipstat.ips_badhlen);
+ goto bad;
+ }
+ if (hlen > m->m_len) {
+ if ((m = m_pullup(m, hlen)) == NULL) {
+ OSAddAtomic(1, &ipstat.ips_badhlen);
+ return;
+ }
+ ip = mtod(m, struct ip *);
+ }
+
+ /* 127/8 must not appear on wire - RFC1122 */
+ if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
+ (ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
+ /*
+ * Allow for the following exceptions:
+ *
+ * 1. If the packet was sent to loopback (i.e. rcvif
+ * would have been set earlier at output time.)
+ *
+ * 2. If the packet was sent out on loopback from a local
+ * source address which belongs to a non-loopback
+ * interface (i.e. rcvif may not necessarily be a
+ * loopback interface, hence the test for PKTF_LOOP.)
+ * Unlike IPv6, there is no interface scope ID, and
+ * therefore we don't care so much about PKTF_IFINFO.
+ */
+ if (!(inifp->if_flags & IFF_LOOPBACK) &&
+ !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) {
+ OSAddAtomic(1, &ipstat.ips_badaddr);
+ goto bad;
+ }
+ }
+
+ /* IPv4 Link-Local Addresses as defined in RFC3927 */
+ if ((IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) ||
+ IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)))) {
+ ip_linklocal_stat.iplls_in_total++;
+ if (ip->ip_ttl != MAXTTL) {
+ OSAddAtomic(1, &ip_linklocal_stat.iplls_in_badttl);
+ /* Silently drop link local traffic with bad TTL */
+ if (!ip_linklocal_in_allowbadttl)
+ goto bad;
+ }
+ }
+
+ sum = ip_cksum(m, hlen);
+ if (sum) {
+ goto bad;
+ }
+
+ DTRACE_IP6(receive, struct mbuf *, m, struct inpcb *, NULL,
+ struct ip *, ip, struct ifnet *, inifp,
+ struct ip *, ip, struct ip6_hdr *, NULL);
+
+ /*
+ * Naively assume we can attribute inbound data to the route we would
+ * use to send to this destination. Asymmetric routing breaks this
+ * assumption, but it still allows us to account for traffic from
+ * a remote node in the routing table.
+ * this has a very significant performance impact so we bypass
+ * if nstat_collect is disabled. We may also bypass if the
+ * protocol is tcp in the future because tcp will have a route that
+ * we can use to attribute the data to. That does mean we would not
+ * account for forwarded tcp traffic.
+ */
+ if (nstat_collect) {
+ struct rtentry *rt =
+ ifnet_cached_rtlookup_inet(inifp, ip->ip_src);
+ if (rt != NULL) {
+ nstat_route_rx(rt, 1, m->m_pkthdr.len, 0);
+ rtfree(rt);
+ }
+ }
+
+ /*
+ * Convert fields to host representation.
+ */
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_len);
+#endif
+
+ if (ip->ip_len < hlen) {
+ OSAddAtomic(1, &ipstat.ips_badlen);
+ goto bad;
+ }
+
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_off);
+#endif
+ /*
+ * Check that the amount of data in the buffers
+ * is as at least much as the IP header would have us expect.
+ * Trim mbufs if longer than we expect.
+ * Drop packet if shorter than we expect.
+ */
+ if (m->m_pkthdr.len < ip->ip_len) {
+tooshort:
+ OSAddAtomic(1, &ipstat.ips_tooshort);
+ goto bad;
+ }
+ if (m->m_pkthdr.len > ip->ip_len) {
+ /*
+ * Invalidate hardware checksum info if ip_adj_clear_hwcksum
+ * is set; useful to handle buggy drivers. Note that this
+ * should not be enabled by default, as we may get here due
+ * to link-layer padding.
+ */
+ if (ip_adj_clear_hwcksum &&
+ (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
+ !(inifp->if_flags & IFF_LOOPBACK) &&
+ !(m->m_pkthdr.pkt_flags & PKTF_LOOP)) {
+ m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID;
+ m->m_pkthdr.csum_data = 0;
+ ipstat.ips_adj_hwcsum_clr++;
+ }
+
+ ipstat.ips_adj++;
+ if (m->m_len == m->m_pkthdr.len) {
+ m->m_len = ip->ip_len;
+ m->m_pkthdr.len = ip->ip_len;
+ } else
+ m_adj(m, ip->ip_len - m->m_pkthdr.len);
+ }
+
+ /* for consistency */
+ m->m_pkthdr.pkt_proto = ip->ip_p;
+
+#if DUMMYNET
+check_with_pf:
+#endif
+#if PF
+ /* Invoke inbound packet filter */
+ if (PF_IS_ENABLED) {
+ int error;
+#if DUMMYNET
+ error = pf_af_hook(inifp, NULL, &m, AF_INET, TRUE, &args);
+#else
+ error = pf_af_hook(inifp, NULL, &m, AF_INET, TRUE, NULL);
+#endif /* DUMMYNET */
+ if (error != 0 || m == NULL) {
+ if (m != NULL) {
+ panic("%s: unexpected packet %p\n",
+ __func__, m);
+ /* NOTREACHED */
+ }
+ /* Already freed by callee */
+ return;
+ }
+ ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
}
- dooptions:
+#endif /* PF */
+
+#if IPSEC
+ if (ipsec_bypass == 0 && ipsec_gethist(m, NULL))
+ goto pass;
#endif
+#if IPFIREWALL
+#if DUMMYNET
+iphack:
+#endif /* DUMMYNET */
+ /*
+ * Check if we want to allow this packet to be processed.
+ * Consider it to be bad if not.
+ */
+ if (fw_enable && IPFW_LOADED) {
+#if IPFIREWALL_FORWARD
+ /*
+ * If we've been forwarded from the output side, then
+ * skip the firewall a second time
+ */
+ if (args.fwa_next_hop)
+ goto ours;
+#endif /* IPFIREWALL_FORWARD */
+
+ args.fwa_m = m;
+
+ i = ip_fw_chk_ptr(&args);
+ m = args.fwa_m;
+
+ if ((i & IP_FW_PORT_DENY_FLAG) || m == NULL) { /* drop */
+ if (m)
+ m_freem(m);
+ return;
+ }
+ ip = mtod(m, struct ip *); /* just in case m changed */
+
+ if (i == 0 && args.fwa_next_hop == NULL) { /* common case */
+ goto pass;
+ }
+#if DUMMYNET
+ if (DUMMYNET_LOADED && (i & IP_FW_PORT_DYNT_FLAG) != 0) {
+ /* Send packet to the appropriate pipe */
+ ip_dn_io_ptr(m, i&0xffff, DN_TO_IP_IN, &args,
+ DN_CLIENT_IPFW);
+ return;
+ }
+#endif /* DUMMYNET */
+#if IPDIVERT
+ if (i != 0 && (i & IP_FW_PORT_DYNT_FLAG) == 0) {
+ /* Divert or tee packet */
+ div_info = i;
+ goto ours;
+ }
+#endif
+#if IPFIREWALL_FORWARD
+ if (i == 0 && args.fwa_next_hop != NULL) {
+ goto pass;
+ }
+#endif
+ /*
+ * if we get here, the packet must be dropped
+ */
+ m_freem(m);
+ return;
+ }
+#endif /* IPFIREWALL */
+#if IPSEC | IPFIREWALL
+pass:
+#endif
/*
* Process options and, if not destined for us,
* ship it on. ip_dooptions returns 1 when an
* 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).
*/
- for (ia = TAILQ_FIRST(&in_ifaddrhead); ia;
- ia = TAILQ_NEXT(ia, ia_link)) {
-#define satosin(sa) ((struct sockaddr_in *)(sa))
+ if (TAILQ_EMPTY(&in_ifaddrhead) && !(m->m_flags & (M_MCAST|M_BCAST))) {
+ ip_setdstifaddr_info(m, inifp->if_index, NULL);
+ goto ours;
+ }
- if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr)
- goto ours;
+ /*
+ * Cache the destination address of the packet; this may be
+ * changed by use of 'ipfw fwd'.
+ */
+#if IPFIREWALL
+ pkt_dst = args.fwa_next_hop == NULL ?
+ ip->ip_dst : args.fwa_next_hop->sin_addr;
+#else /* !IPFIREWALL */
+ pkt_dst = ip->ip_dst;
+#endif /* !IPFIREWALL */
- if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY)
- goto ours;
+ /*
+ * Enable a consistency check between the destination address
+ * and the arrival interface for a unicast packet (the RFC 1122
+ * strong ES model) if IP forwarding is disabled and the packet
+ * is not locally generated and the packet is not subject to
+ * 'ipfw fwd'.
+ *
+ * XXX - Checking also should be disabled if the destination
+ * address is ipnat'ed to a different interface.
+ *
+ * XXX - Checking is incompatible with IP aliases added
+ * to the loopback interface instead of the interface where
+ * the packets are received.
+ */
+ 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 */
-#if IPFIREWALL_FORWARD
+ /*
+ * 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 addr to forward to is one of ours, we pretend to
- * be the destination for this packet.
+ * If the address matches, verify that the packet
+ * arrived via the correct interface if checking is
+ * enabled.
*/
- if (ip_fw_fwd_addr == NULL) {
- if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr)
- goto ours;
- } else if (IA_SIN(ia)->sin_addr.s_addr ==
- ip_fw_fwd_addr->sin_addr.s_addr)
- goto ours;
-#else
- if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_dst.s_addr)
+ 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;
-#endif
- if (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 ==
- ip->ip_dst.s_addr)
- goto ours;
- if (ip->ip_dst.s_addr == ia->ia_netbroadcast.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.
- *
- * (The IP ident field is put in the same byte order
- * as expected when ip_mforward() is called from
- * ip_output().)
- */
- ip->ip_id = htons(ip->ip_id);
- if (ip_mforward(ip, m->m_pkthdr.rcvif, m, 0) != 0) {
- ipstat.ips_cantforward++;
- m_freem(m);
- return;
- }
- ip->ip_id = ntohs(ip->ip_id);
+ /*
+ * See if we belong to the destination multicast group on the
+ * arrival interface.
+ */
+ in_multihead_lock_shared();
+ IN_LOOKUP_MULTI(&ip->ip_dst, inifp, inm);
+ in_multihead_lock_done();
+ if (inm == NULL) {
+ OSAddAtomic(1, &ipstat.ips_notmember);
+ m_freem(m);
+ return;
+ }
+ ip_setdstifaddr_info(m, inifp->if_index, NULL);
+ INM_REMREF(inm);
+ goto ours;
+ }
+ if (ip->ip_dst.s_addr == (u_int32_t)INADDR_BROADCAST ||
+ ip->ip_dst.s_addr == INADDR_ANY) {
+ ip_setdstifaddr_info(m, inifp->if_index, NULL);
+ goto ours;
+ }
+
+ /* Allow DHCP/BootP responses through */
+ if ((inifp->if_eflags & IFEF_AUTOCONFIGURING) &&
+ hlen == sizeof (struct ip) && ip->ip_p == IPPROTO_UDP) {
+ struct udpiphdr *ui;
+
+ if (m->m_len < sizeof (struct udpiphdr) &&
+ (m = m_pullup(m, sizeof (struct udpiphdr))) == NULL) {
+ OSAddAtomic(1, &udpstat.udps_hdrops);
+ return;
+ }
+ ui = mtod(m, struct udpiphdr *);
+ if (ntohs(ui->ui_dport) == IPPORT_BOOTPC) {
+ ip_setdstifaddr_info(m, inifp->if_index, NULL);
+ goto ours;
+ }
+ ip = mtod(m, struct ip *); /* in case it changed */
+ }
+
+ /*
+ * Not for us; forward if possible and desirable.
+ */
+ if (ipforwarding == 0) {
+ OSAddAtomic(1, &ipstat.ips_cantforward);
+ m_freem(m);
+ } else {
+#if IPFIREWALL
+ ip_forward(m, 0, args.fwa_next_hop);
+#else
+ ip_forward(m, 0, NULL);
+#endif
+ }
+ return;
+
+ours:
+ /*
+ * If offset or IP_MF are set, must reassemble.
+ */
+ if (ip->ip_off & ~(IP_DF | IP_RF)) {
+ /*
+ * ip_reass() will return a different mbuf, and update
+ * the divert info in div_info and args.fwa_divert_rule.
+ */
+#if IPDIVERT
+ m = ip_reass(m, (u_int16_t *)&div_info, &args.fwa_divert_rule);
+#else
+ m = ip_reass(m);
+#endif
+ if (m == NULL)
+ return;
+ ip = mtod(m, struct ip *);
+ /* Get the header length of the reassembled packet */
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+#if IPDIVERT
+ /* Restore original checksum before diverting packet */
+ if (div_info != 0) {
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+ ip->ip_sum = 0;
+ ip->ip_sum = ip_cksum_hdr_in(m, hlen);
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_off);
+ NTOHS(ip->ip_len);
+#endif
+ }
+#endif
+ }
+
+ /*
+ * Further protocols expect the packet length to be w/o the
+ * IP header.
+ */
+ ip->ip_len -= hlen;
+
+#if IPDIVERT
+ /*
+ * Divert or tee packet to the divert protocol if required.
+ *
+ * If div_info is zero then cookie should be too, so we shouldn't
+ * need to clear them here. Assume divert_packet() does so also.
+ */
+ if (div_info != 0) {
+ struct mbuf *clone = NULL;
+
+ /* Clone packet if we're doing a 'tee' */
+ if (div_info & IP_FW_PORT_TEE_FLAG)
+ clone = m_dup(m, M_DONTWAIT);
+
+ /* Restore packet header fields to original values */
+ ip->ip_len += hlen;
+
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+ /* Deliver packet to divert input routine */
+ OSAddAtomic(1, &ipstat.ips_delivered);
+ divert_packet(m, 1, div_info & 0xffff, args.fwa_divert_rule);
+
+ /* If 'tee', continue with original packet */
+ if (clone == NULL) {
+ return;
+ }
+ m = clone;
+ ip = mtod(m, struct ip *);
+ }
+#endif
+
+#if IPSEC
+ /*
+ * enforce IPsec policy checking if we are seeing last header.
+ * note that we do not visit this with protocols with pcb layer
+ * code - like udp/tcp/raw ip.
+ */
+ if (ipsec_bypass == 0 && (ip_protox[ip->ip_p]->pr_flags & PR_LASTHDR)) {
+ if (ipsec4_in_reject(m, NULL)) {
+ IPSEC_STAT_INCREMENT(ipsecstat.in_polvio);
+ goto bad;
+ }
+ }
+#endif /* IPSEC */
+
+ /*
+ * Switch out to protocol's input routine.
+ */
+ OSAddAtomic(1, &ipstat.ips_delivered);
- /*
- * 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++;
+#if IPFIREWALL
+ if (args.fwa_next_hop && ip->ip_p == IPPROTO_TCP) {
+ /* TCP needs IPFORWARD info if available */
+ struct m_tag *fwd_tag;
+ struct ip_fwd_tag *ipfwd_tag;
+
+ fwd_tag = m_tag_create(KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_IPFORWARD, sizeof (*ipfwd_tag),
+ M_NOWAIT, m);
+ if (fwd_tag == NULL)
+ goto bad;
+
+ ipfwd_tag = (struct ip_fwd_tag *)(fwd_tag+1);
+ ipfwd_tag->next_hop = args.fwa_next_hop;
+
+ m_tag_prepend(m, fwd_tag);
+
+ KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr,
+ ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
+
+ /* TCP deals with its own locking */
+ ip_proto_dispatch_in(m, hlen, ip->ip_p, 0);
+ } else {
+ KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr,
+ ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
+
+ if ((sw_lro) && (ip->ip_p == IPPROTO_TCP)) {
+ m = tcp_lro(m, hlen);
+ if (m == NULL)
+ return;
}
- /*
- * See if we belong to the destination multicast group on the
- * arrival interface.
- */
- IN_LOOKUP_MULTI(ip->ip_dst, m->m_pkthdr.rcvif, inm);
- if (inm == NULL) {
- ipstat.ips_notmember++;
- m_freem(m);
+
+ 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;
- }
- goto ours;
}
- if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
- goto ours;
- if (ip->ip_dst.s_addr == INADDR_ANY)
- goto ours;
+ ip_proto_dispatch_in(m, hlen, ip->ip_p, 0);
+#endif /* !IPFIREWALL */
+ return;
- if (m->m_pkthdr.rcvif
- && (m->m_pkthdr.rcvif->if_eflags & IFEF_AUTOCONFIGURING)
- && ip->ip_p == IPPROTO_UDP) {
- goto ours;
- }
+bad:
+ KERNEL_DEBUG(DBG_LAYER_END, 0, 0, 0, 0, 0);
+ m_freem(m);
+}
-#if defined(NFAITH) && NFAITH > 0
+static void
+ipq_updateparams(void)
+{
+ lck_mtx_assert(&ipqlock, LCK_MTX_ASSERT_OWNED);
/*
- * FAITH(Firewall Aided Internet Translator)
+ * -1 for unlimited allocation.
*/
- 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;
- }
+ if (maxnipq < 0)
+ ipq_limit = 0;
+ /*
+ * Positive number for specific bound.
+ */
+ if (maxnipq > 0)
+ ipq_limit = maxnipq;
+ /*
+ * Zero specifies no further fragment queue allocation -- set the
+ * bound very low, but rely on implementation elsewhere to actually
+ * prevent allocation and reclaim current queues.
+ */
+ if (maxnipq == 0)
+ ipq_limit = 1;
+ /*
+ * Arm the purge timer if not already and if there's work to do
+ */
+ frag_sched_timeout();
+}
+
+static int
+sysctl_maxnipq SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+ int error, i;
+
+ lck_mtx_lock(&ipqlock);
+ i = maxnipq;
+ error = sysctl_handle_int(oidp, &i, 0, req);
+ if (error || req->newptr == USER_ADDR_NULL)
+ goto done;
+ /* impose bounds */
+ if (i < -1 || i > (nmbclusters / 4)) {
+ error = EINVAL;
+ goto done;
+ }
+ maxnipq = i;
+ ipq_updateparams();
+done:
+ lck_mtx_unlock(&ipqlock);
+ return (error);
+}
+
+static int
+sysctl_maxfragsperpacket SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+ int error, i;
+
+ lck_mtx_lock(&ipqlock);
+ i = maxfragsperpacket;
+ error = sysctl_handle_int(oidp, &i, 0, req);
+ if (error || req->newptr == USER_ADDR_NULL)
+ goto done;
+ maxfragsperpacket = i;
+ ipq_updateparams(); /* see if we need to arm timer */
+done:
+ lck_mtx_unlock(&ipqlock);
+ return (error);
+}
+
+/*
+ * Take incoming datagram fragment and try to reassemble it into
+ * whole datagram. If a chain for reassembly of this datagram already
+ * exists, then it is given as fp; otherwise have to make a chain.
+ *
+ * When IPDIVERT enabled, keep additional state with each packet that
+ * tells us if we need to divert or tee the packet we're building.
+ *
+ * The IP header is *NOT* adjusted out of iplen.
+ */
+static struct mbuf *
+#if IPDIVERT
+ip_reass(struct mbuf *m,
+#ifdef IPDIVERT_44
+ u_int32_t *divinfo,
+#else /* IPDIVERT_44 */
+ u_int16_t *divinfo,
+#endif /* IPDIVERT_44 */
+ u_int16_t *divcookie)
+#else /* IPDIVERT */
+ip_reass(struct mbuf *m)
+#endif /* IPDIVERT */
+{
+ struct ip *ip;
+ struct mbuf *p, *q, *nq, *t;
+ struct ipq *fp = NULL;
+ struct ipqhead *head;
+ int i, hlen, next;
+ u_int8_t ecn, ecn0;
+ uint32_t csum, csum_flags;
+ uint16_t hash;
+ struct fq_head dfq;
+
+ MBUFQ_INIT(&dfq); /* for deferred frees */
+
+ /* If maxnipq or maxfragsperpacket is 0, never accept fragments. */
+ if (maxnipq == 0 || maxfragsperpacket == 0) {
+ ipstat.ips_fragments++;
+ ipstat.ips_fragdropped++;
m_freem(m);
- return;
+ if (nipq > 0) {
+ lck_mtx_lock(&ipqlock);
+ frag_sched_timeout(); /* purge stale fragments */
+ lck_mtx_unlock(&ipqlock);
+ }
+ return (NULL);
}
-#endif
+
+ 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];
+
/*
- * Not for us; forward if possible and desirable.
+ * Look for queue of fragments
+ * of this datagram.
*/
- if (ipforwarding == 0) {
- ipstat.ips_cantforward++;
- m_freem(m);
- } else
- ip_forward(m, 0);
-#if IPFIREWALL_FORWARD
- ip_fw_fwd_addr = NULL;
+ 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
- return;
+ ip->ip_p == fp->ipq_p)
+ goto found;
+ }
-ours:
+ fp = NULL;
/*
- * 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 (m->m_flags & M_EXT) { /* XXX */
- if ((m = m_pullup(m, hlen)) == 0) {
- ipstat.ips_toosmall++;
-#if IPDIVERT
- frag_divert_port = 0;
- ip_divert_cookie = 0;
-#endif
-#if IPFIREWALL_FORWARD
- ip_fw_fwd_addr = NULL;
-#endif
- return;
- }
- ip = mtod(m, struct ip *);
- }
- sum = IPREASS_HASH(ip->ip_src.s_addr, ip->ip_id);
+ * Attempt to trim the number of allocated fragment queues if it
+ * exceeds the administrative limit.
+ */
+ if ((nipq > (unsigned)maxnipq) && (maxnipq > 0)) {
/*
- * Look for queue of fragments
- * of this datagram.
+ * drop something from the tail of the current queue
+ * before proceeding further
*/
- 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 */
+ struct ipq *fq = TAILQ_LAST(head, ipqhead);
+ if (fq == NULL) { /* 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;
+ struct ipq *r = TAILQ_LAST(&ipq[i], ipqhead);
+ if (r) {
+ ipstat.ips_fragtimeout += r->ipq_nfrags;
+ frag_freef(&ipq[i], r);
+ break;
+ }
}
- m->m_flags |= M_FRAG;
+ } else {
+ ipstat.ips_fragtimeout += fq->ipq_nfrags;
+ frag_freef(head, fq);
}
- ip->ip_off <<= 3;
+ }
- /*
- * If datagram marked as having more fragments
- * or if this is not the first fragment,
- * attempt reassembly; if it succeeds, proceed.
- */
- if (mff || ip->ip_off) {
- ipstat.ips_fragments++;
- m->m_pkthdr.header = ip;
- ip = ip_reass(m, fp, &ipq[sum]);
- if (ip == 0) {
-#if IPFIREWALL_FORWARD
- ip_fw_fwd_addr = NULL;
-#endif
- return;
- }
- /* Get the length of the reassembled packets header */
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
- ipstat.ips_reassembled++;
- m = dtom(ip);
-#if IPDIVERT
- if (frag_divert_port) {
- struct mbuf m;
- m.m_next = 0;
- m.m_len = hlen;
- m.m_data = (char *) ip;
- ip->ip_len += hlen;
+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);
- HTONS(ip->ip_id);
- ip->ip_sum = 0;
- ip->ip_sum = in_cksum(&m, hlen);
- NTOHS(ip->ip_id);
+ }
+#endif
+ /* callee folds in sum */
+ csum = m_adj_sum16(m, start, hlen, csum);
+#if BYTE_ORDER != BIG_ENDIAN
+ if (start < hlen) {
NTOHS(ip->ip_off);
NTOHS(ip->ip_len);
- ip->ip_len -= hlen;
}
#endif
- } else
- if (fp)
- ip_freef(fp);
- } else
- ip->ip_len -= hlen;
-
-#if IPDIVERT
- /*
- * Divert reassembled packets to the divert protocol if required
- * If divert port is null then cookie should be too,
- * so we shouldn't need to clear them here. Assume ip_divert does so.
- */
- if (frag_divert_port) {
- ipstat.ips_delivered++;
- ip_divert_port = frag_divert_port;
- frag_divert_port = 0;
- (*ip_protox[IPPROTO_DIVERT]->pr_input)(m, hlen);
- return;
+ }
+ csum_flags = m->m_pkthdr.csum_flags;
+ } else {
+ csum = 0;
+ csum_flags = 0;
}
- /* Don't let packets divert themselves */
- if (ip->ip_p == IPPROTO_DIVERT) {
- ipstat.ips_noproto++;
- goto bad;
- }
+ /* Invalidate checksum */
+ m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID;
-#endif
+ ipstat.ips_fragments++;
/*
- * Switch out to protocol's input routine.
+ * Adjust ip_len to not reflect header,
+ * convert offset of this to bytes.
*/
- 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);
-
- (*ip_protox[ip->ip_p]->pr_input)(m, hlen);
-#if IPFIREWALL_FORWARD
- ip_fw_fwd_addr = NULL; /* tcp needed it */
-#endif
- return;
-bad:
-#if IPFIREWALL_FORWARD
- ip_fw_fwd_addr = NULL;
-#endif
- 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)
-{
- 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;
+ 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;
}
-
- ip_input(m);
+ m->m_flags |= M_FRAG;
+ } else {
+ /* Clear the flag in case packet comes from loopback */
+ m->m_flags &= ~M_FRAG;
}
-}
+ ip->ip_off <<= 3;
-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 exists, then it
- * is given as fp; otherwise have to make a chain.
- */
-static struct ip *
-ip_reass(m, fp, where)
- register struct mbuf *m;
- register struct ipq *fp;
- struct ipq *where;
-{
- 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;
+ m->m_pkthdr.pkt_hdr = ip;
+ /* Previous ip_reass() started here. */
/*
* Presence of header sizes in mbufs
* would confuse code below.
m->m_data += hlen;
m->m_len -= hlen;
- if (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) {
- if ((t = m_get(M_DONTWAIT, MT_FTABLE)) == NULL)
+ if (fp == NULL) {
+ fp = ipq_alloc(M_DONTWAIT);
+ if (fp == NULL)
goto dropfrag;
- fp = mtod(t, struct ipq *);
- insque((void *) fp, (void *) where);
+#if CONFIG_MACF_NET
+ if (mac_ipq_label_init(fp, M_NOWAIT) != 0) {
+ ipq_free(fp);
+ fp = NULL;
+ goto dropfrag;
+ }
+ mac_ipq_label_associate(m, fp);
+#endif
+ TAILQ_INSERT_HEAD(head, fp, ipq_list);
nipq++;
+ fp->ipq_nfrags = 1;
fp->ipq_ttl = IPFRAGTTL;
fp->ipq_p = ip->ip_p;
fp->ipq_id = ip->ip_id;
fp->ipq_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
- fp->ipq_divert = 0;
- fp->ipq_div_cookie = 0;
+ /*
+ * Transfer firewall instructions to the fragment structure.
+ * Only trust info in the fragment at offset 0.
+ */
+ if (ip->ip_off == 0) {
+#ifdef IPDIVERT_44
+ fp->ipq_div_info = *divinfo;
+#else
+ fp->ipq_divert = *divinfo;
+#endif
+ fp->ipq_div_cookie = *divcookie;
+ }
+ *divinfo = 0;
+ *divcookie = 0;
+#endif /* IPDIVERT */
+ m = NULL; /* nothing to return */
+ goto done;
+ } else {
+ fp->ipq_nfrags++;
+#if CONFIG_MACF_NET
+ mac_ipq_label_update(m, fp);
#endif
- 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.
* our data already. If so, drop the data from the incoming
* segment. If it provides all of our data, drop us, otherwise
* stick new segment in the proper place.
+ *
+ * If some of the data is dropped from the preceding
+ * segment, then it's checksum is invalidated.
*/
if (p) {
i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
if (i > 0) {
if (i >= ip->ip_len)
goto dropfrag;
- m_adj(dtom(ip), i);
- m->m_pkthdr.csum_flags = 0;
+ m_adj(m, i);
+ fp->ipq_csum_flags = 0;
ip->ip_off += i;
ip->ip_len -= i;
}
* 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
/*
- * Any fragment diverting causes the whole packet to divert
+ * Transfer firewall instructions to the fragment structure.
+ * Only trust info in the fragment at offset 0.
*/
- if (frag_divert_port) {
- fp->ipq_divert = frag_divert_port;
- fp->ipq_div_cookie = ip_divert_cookie;
- }
- frag_divert_port = 0;
- ip_divert_cookie = 0;
+ if (ip->ip_off == 0) {
+#ifdef IPDIVERT_44
+ fp->ipq_div_info = *divinfo;
+#else
+ fp->ipq_divert = *divinfo;
#endif
+ fp->ipq_div_cookie = *divcookie;
+ }
+ *divinfo = 0;
+ *divcookie = 0;
+#endif /* IPDIVERT */
/*
- * Check for complete reassembly.
+ * 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.
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;
}
/*
*/
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_data += q->m_pkthdr.csum_data ;
- m->m_pkthdr.csum_flags &= q->m_pkthdr.csum_flags;
- }
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 divert port for packet, if any
+ * Extract firewall instructions from the fragment structure.
*/
- frag_divert_port = fp->ipq_divert;
- ip_divert_cookie = fp->ipq_div_cookie;
+#ifdef IPDIVERT_44
+ *divinfo = fp->ipq_div_info;
+#else
+ *divinfo = fp->ipq_divert;
#endif
+ *divcookie = fp->ipq_div_cookie;
+#endif /* IPDIVERT */
+#if CONFIG_MACF_NET
+ mac_mbuf_label_associate_ipq(fp, m);
+ mac_ipq_label_destroy(fp);
+#endif
/*
- * Create header for new ip packet by
- * modifying header of first packet;
- * dequeue and discard fragment reassembly header.
+ * 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));
+
+ 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; m; m = m->m_next)
- plen += m->m_len;
- t->m_pkthdr.len = plen;
- }
- return (ip);
+ 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
- frag_divert_port = 0;
- ip_divert_cookie = 0;
-#endif
+ *divinfo = 0;
+ *divcookie = 0;
+#endif /* IPDIVERT */
ipstat.ips_fragdropped++;
+ if (fp != NULL)
+ fp->ipq_nfrags--;
+ /* arm the purge timer if not already and if there's work to do */
+ frag_sched_timeout();
+ lck_mtx_unlock(&ipqlock);
m_freem(m);
- return (0);
-
+ /* perform deferred free (if needed) */
+ if (!MBUFQ_EMPTY(&dfq))
+ MBUFQ_DRAIN(&dfq);
+ VERIFY(MBUFQ_EMPTY(&dfq));
+ return (NULL);
#undef GETIP
}
* 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));
+ 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);
+ }
+ }
+ }
+ /*
+ * If we are over the maximum number of fragments
+ * (due to the limit being lowered), drain off
+ * enough to get down to the new limit.
+ */
+ if (maxnipq >= 0 && nipq > (unsigned)maxnipq) {
+ for (i = 0; i < IPREASS_NHASH; i++) {
+ while (nipq > (unsigned)maxnipq &&
+ !TAILQ_EMPTY(&ipq[i])) {
+ ipstat.ips_fragdropped +=
+ TAILQ_FIRST(&ipq[i])->ipq_nfrags;
+ frag_freef(&ipq[i], TAILQ_FIRST(&ipq[i]));
}
}
}
- 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);
if (opt == IPOPT_NOP)
optlen = 1;
else {
- if (cnt < IPOPT_OLEN + sizeof(*cp)) {
- code = &cp[IPOPT_OLEN] - (u_char *)ip;
+ 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;
}
*/
case IPOPT_LSRR:
case IPOPT_SSRR:
+ if (optlen < IPOPT_OFFSET + sizeof (*cp)) {
+ code = &cp[IPOPT_OLEN] - (u_char *)ip;
+ goto bad;
+ }
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
goto bad;
}
ipaddr.sin_addr = ip->ip_dst;
- ia = (struct in_ifaddr *)
- ifa_ifwithaddr((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;
* yet; nothing to do except forward.
*/
break;
+ } else {
+ IFA_REMREF(&ia->ia_ifa);
+ ia = NULL;
}
off--; /* 0 origin */
- if (off > optlen - sizeof(struct in_addr)) {
+ if (off > optlen - (int)sizeof (struct in_addr)) {
/*
* End of source route. Should be for us.
*/
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);
}
/*
* 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
*/
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;
}
* If no space remains, ignore.
*/
off--; /* 0 origin */
- if (off > optlen - 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;
- if (ipt->ipt_len < 5)
+ ipt = (struct ip_timestamp *)(void *)cp;
+ if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
+ code = (u_char *)&ipt->ipt_len - (u_char *)ip;
+ goto bad;
+ }
+ if (ipt->ipt_ptr < 5) {
+ code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
goto bad;
- if (ipt->ipt_ptr > ipt->ipt_len - sizeof(int32_t)) {
- if (++ipt->ipt_oflw == 0)
+ }
+ if (ipt->ipt_ptr >
+ ipt->ipt_len - (int)sizeof (int32_t)) {
+ if (++ipt->ipt_oflw == 0) {
+ code = (u_char *)&ipt->ipt_ptr -
+ (u_char *)ip;
goto bad;
+ }
break;
}
- sin = (struct in_addr *)(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:
+ /* XXX can't take &ipt->ipt_flg */
+ code = (u_char *)&ipt->ipt_ptr -
+ (u_char *)ip + 1;
goto bad;
}
ntime = iptime();
- (void)memcpy(cp + ipt->ipt_ptr - 1, &ntime,
- sizeof(n_time));
- ipt->ipt_ptr += sizeof(n_time);
+ (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;
+ }
+ }
+
+ return (found_ra);
+}
- rtalloc_ign(&ipforward_rt, RTF_PRCLONING);
+/*
+ * 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);
}
/*
* 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;
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;
}
* 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);
*(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
/*
*/
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,
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--;
}
*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);
}
* 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);
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
+ 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
* The srcrt parameter indicates whether the packet is being forwarded
* via a source route.
*/
-#ifndef NATPT
-static
-#endif
-void
-ip_forward(m, srcrt)
- struct mbuf *m;
- int srcrt;
+static void
+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 };
+ 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 || 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;
}
- HTONS(ip->ip_id);
- if (ip->ip_ttl <= IPTTLDEC) {
- icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
- return;
+#if IPSTEALTH
+ if (!ipstealth) {
+#endif /* IPSTEALTH */
+ if (ip->ip_ttl <= IPTTLDEC) {
+ icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS,
+ dest, 0);
+ return;
+ }
+#if IPSTEALTH
}
- ip->ip_ttl -= IPTTLDEC;
+#endif /* IPSTEALTH */
-#if defined(PM)
- if (doRoute)
- {
- struct route *ipfw_rt;
+#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 */
- if ((ipfw_rt = pm_route(m)) != NULL)
- {
- mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64));
-#if IPSEC
- ipsec_setsocket(m, NULL);
-#endif /*IPSEC*/
- error = ip_output(m, (struct mbuf *)0, ipfw_rt,
- IP_FORWARDING | IP_PROTOCOLROUTE , 0);
- goto clearAway;
- }
+ ip_fwd_route_copyout(rcvifp, &fwd_rt);
- }
-#endif
+ 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 at most 64 bytes of the packet in case
- * we need to generate an ICMP message to the src.
+ * Save the IP header and at most 8 bytes of the payload,
+ * in case we need to generate an ICMP message to the src.
+ *
+ * We don't use m_copy() because it might return a reference
+ * to a shared cluster. Both this function and ip_output()
+ * assume exclusive access to the IP header in `m', so any
+ * data in a cluster may change before we reach icmp_error().
*/
- mcopy = m_copy(m, 0, imin((int)ip->ip_len, 64));
+ MGET(mcopy, M_DONTWAIT, m->m_type);
+ if (mcopy != NULL) {
+ M_COPY_PKTHDR(mcopy, m);
+ mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8,
+ (int)ip->ip_len);
+ m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
+ }
+
+#if IPSTEALTH
+ if (!ipstealth) {
+#endif /* IPSTEALTH */
+ ip->ip_ttl -= IPTTLDEC;
+#if IPSTEALTH
+ }
+#endif /* IPSTEALTH */
/*
* If forwarding packet using same interface that it came in on,
* 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 IPSEC
- ipsec_setsocket(m, NULL);
-#endif /*IPSEC*/
- error = ip_output(m, (struct mbuf *)0, &ipforward_rt,
- IP_FORWARDING, 0);
-#if defined(PM)
- clearAway:;
-#endif
- if (error)
- ipstat.ips_cantforward++;
- else {
- ipstat.ips_forward++;
- if (type)
- ipstat.ips_redirectsent++;
- else {
- if (mcopy) {
- ipflow_create(&ipforward_rt, mcopy);
+#if IPFIREWALL
+ if (next_hop != NULL) {
+ /* Pass IPFORWARD info if available */
+ struct m_tag *tag;
+ struct ip_fwd_tag *ipfwd_tag;
+
+ tag = m_tag_create(KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_IPFORWARD,
+ sizeof (*ipfwd_tag), M_NOWAIT, m);
+ if (tag == NULL) {
+ error = ENOBUFS;
+ m_freem(m);
+ goto done;
+ }
+
+ ipfwd_tag = (struct ip_fwd_tag *)(tag+1);
+ ipfwd_tag->next_hop = next_hop;
+
+ m_tag_prepend(m, tag);
+ }
+#endif /* IPFIREWALL */
+
+ /* Mark this packet as being forwarded from another interface */
+ m->m_pkthdr.pkt_flags |= PKTF_FORWARDED;
+ len = m_pktlen(m);
+
+ error = ip_output(m, NULL, &fwd_rt, IP_FORWARDING | IP_OUTARGS,
+ NULL, &ipoa);
+
+ /* Refresh rt since the route could have changed while in IP */
+ rt = fwd_rt.ro_rt;
+
+ if (error != 0) {
+ OSAddAtomic(1, &ipstat.ips_cantforward);
+ } else {
+ /*
+ * Increment stats on the source interface; the ones
+ * for destination interface has been taken care of
+ * during output above by virtue of PKTF_FORWARDED.
+ */
+ rcvifp->if_fpackets++;
+ rcvifp->if_fbytes += len;
+
+ OSAddAtomic(1, &ipstat.ips_forward);
+ if (type != 0) {
+ OSAddAtomic(1, &ipstat.ips_redirectsent);
+ } else {
+ if (mcopy != NULL) {
+ /*
+ * If we didn't have to go thru ipflow and
+ * the packet was successfully consumed by
+ * ip_output, the mcopy is rather a waste;
+ * this could be further optimized.
+ */
m_freem(mcopy);
}
- return;
+ goto done;
}
}
if (mcopy == NULL)
- return;
- destifp = NULL;
+ goto done;
switch (error) {
-
case 0: /* forwarded, but need redirect */
/* type, code set above */
break;
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);
- sp = ipsec4_getpolicybyaddr(mcopy,
- IPSEC_DIR_OUTBOUND,
- IP_FORWARDING,
- &ipsecerror);
+ if (sp == NULL)
+ break;
- if (sp == NULL)
- destifp = ipforward_rt.ro_rt->rt_ifp;
- else {
- /* count IPsec header size */
- ipsechdr = ipsec4_hdrsiz(mcopy,
- IPSEC_DIR_OUTBOUND,
- NULL);
+ /*
+ * find the correct route for outer IPv4
+ * header, compute tunnel MTU.
+ */
+ nextmtu = 0;
- /*
- * 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;
+ if (sp->req != NULL &&
+ sp->req->saidx.mode == IPSEC_MODE_TUNNEL) {
+ struct secasindex saidx;
+ struct secasvar *sav;
+ struct route *ro;
+ struct ip *ipm;
+ int ipsechdr;
+
+ /* count IPsec header size */
+ ipsechdr = ipsec_hdrsiz(sp);
+
+ ipm = mtod(mcopy, struct ip *);
+ bcopy(&sp->req->saidx, &saidx, sizeof (saidx));
+ saidx.mode = sp->req->saidx.mode;
+ saidx.reqid = sp->req->saidx.reqid;
+ sin = SIN(&saidx.src);
+ if (sin->sin_len == 0) {
+ sin->sin_len = sizeof (*sin);
+ sin->sin_family = AF_INET;
+ sin->sin_port = IPSEC_PORT_ANY;
+ bcopy(&ipm->ip_src, &sin->sin_addr,
+ sizeof (sin->sin_addr));
+ }
+ sin = SIN(&saidx.dst);
+ if (sin->sin_len == 0) {
+ sin->sin_len = sizeof (*sin);
+ sin->sin_family = AF_INET;
+ sin->sin_port = IPSEC_PORT_ANY;
+ bcopy(&ipm->ip_dst, &sin->sin_addr,
+ sizeof (sin->sin_addr));
+ }
+ sav = key_allocsa_policy(&saidx);
+ if (sav != NULL) {
+ lck_mtx_lock(sadb_mutex);
+ if (sav->sah != NULL) {
+ ro = &sav->sah->sa_route;
+ if (ro->ro_rt != NULL) {
+ RT_LOCK(ro->ro_rt);
+ if (ro->ro_rt->rt_ifp != NULL) {
+ nextmtu = ro->ro_rt->
+ rt_ifp->if_mtu;
+ nextmtu -= ipsechdr;
+ }
+ RT_UNLOCK(ro->ro_rt);
}
}
-
- key_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);
+ 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);
- return 0;
+ if (!(m->m_pkthdr.pkt_flags & PKTF_IFAINFO))
+ return (-1);
+
+ if (src_idx != NULL)
+ *src_idx = m->m_pkthdr.src_ifindex;
+
+ if (iaf != NULL)
+ *iaf = 0;
+
+ return (0);
}
int
-ip_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);
+}
+
+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)));
}
+
projects / apple / xnu.git / blobdiff