/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2017 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
- *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1982, 1986, 1988, 1990, 1993
* SUCH DAMAGE.
*
* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
- * $FreeBSD: src/sys/netinet/ip_output.c,v 1.99.2.16 2001/07/19 06:37:26 kris Exp $
+ */
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 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
+#define _IP_VHL
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
+#include <kern/locks.h>
+#include <sys/sysctl.h>
+#include <sys/mcache.h>
+#include <sys/kdebug.h>
+
+#include <machine/endian.h>
+#include <pexpert/pexpert.h>
+#include <mach/sdt.h>
+
+#include <libkern/OSAtomic.h>
+#include <libkern/OSByteOrder.h>
#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
#include <net/route.h>
+#include <net/ntstat.h>
+#include <net/net_osdep.h>
+#include <net/dlil.h>
+#include <net/net_perf.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
+#include <netinet/kpi_ipfilter_var.h>
+#include <netinet/in_tclass.h>
-#include "faith.h"
-
-#include <net/dlil.h>
-#include <sys/kdebug.h>
-
-#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 1)
-#define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 3)
-#define DBG_FNC_IP_OUTPUT NETDBG_CODE(DBG_NETIP, (1 << 8) | 1)
-
-
-#if vax
-#include <machine/mtpr.h>
-#endif
-
-#if __FreeBSD__
-#include <machine/in_cksum.h>
+#if CONFIG_MACF_NET
+#include <security/mac_framework.h>
+#endif /* CONFIG_MACF_NET */
-static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
-#endif
+#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 1)
+#define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 3)
+#define DBG_FNC_IP_OUTPUT NETDBG_CODE(DBG_NETIP, (1 << 8) | 1)
+#define DBG_FNC_IPSEC4_OUTPUT NETDBG_CODE(DBG_NETIP, (2 << 8) | 1)
#if IPSEC
#include <netinet6/ipsec.h>
#if IPSEC_DEBUG
#include <netkey/key_debug.h>
#else
-#define KEYDEBUG(lev,arg)
+#define KEYDEBUG(lev, arg)
#endif
-#endif /*IPSEC*/
+#endif /* IPSEC */
+#if NECP
+#include <net/necp.h>
+#endif /* NECP */
+
+#if IPFIREWALL
#include <netinet/ip_fw.h>
+#if IPDIVERT
+#include <netinet/ip_divert.h>
+#endif /* IPDIVERT */
+#endif /* IPFIREWALL */
#if DUMMYNET
#include <netinet/ip_dummynet.h>
#endif
-#if IPFIREWALL_FORWARD_DEBUG
-#define print_ip(a) printf("%ld.%ld.%ld.%ld",(ntohl(a.s_addr)>>24)&0xFF,\
- (ntohl(a.s_addr)>>16)&0xFF,\
- (ntohl(a.s_addr)>>8)&0xFF,\
- (ntohl(a.s_addr))&0xFF);
-#endif
-
-u_short ip_id;
-
-static struct mbuf *ip_insertoptions __P((struct mbuf *, struct mbuf *, int *));
-static struct ifnet *ip_multicast_if __P((struct in_addr *, int *));
-static void ip_mloopback
- __P((struct ifnet *, struct mbuf *, struct sockaddr_in *, int));
-static int ip_getmoptions
- __P((struct sockopt *, struct ip_moptions *));
-static int ip_pcbopts __P((int, struct mbuf **, struct mbuf *));
-static int ip_setmoptions
- __P((struct sockopt *, struct ip_moptions **));
-
-int ip_optcopy __P((struct ip *, struct ip *));
-extern int (*fr_checkp) __P((struct ip *, int, struct ifnet *, int, struct mbuf **));
-#ifdef __APPLE__
-extern struct mbuf* m_dup(register struct mbuf *m, int how);
-#endif
+#if PF
+#include <net/pfvar.h>
+#endif /* PF */
-static u_long lo_dl_tag = 0;
+#if IPFIREWALL_FORWARD && IPFIREWALL_FORWARD_DEBUG
+#define print_ip(a) \
+ printf("%ld.%ld.%ld.%ld", (ntohl(a.s_addr) >> 24) & 0xFF, \
+ (ntohl(a.s_addr) >> 16) & 0xFF, \
+ (ntohl(a.s_addr) >> 8) & 0xFF, \
+ (ntohl(a.s_addr)) & 0xFF);
+#endif /* IPFIREWALL_FORWARD && IPFIREWALL_FORWARD_DEBUG */
-void in_delayed_cksum(struct mbuf *m);
-extern int apple_hwcksum_tx;
+u_short ip_id;
-extern struct protosw inetsw[];
+static int sysctl_reset_ip_output_stats SYSCTL_HANDLER_ARGS;
+static int sysctl_ip_output_measure_bins SYSCTL_HANDLER_ARGS;
+static int sysctl_ip_output_getperf SYSCTL_HANDLER_ARGS;
+static void ip_out_cksum_stats(int, u_int32_t);
+static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
+static int ip_optcopy(struct ip *, struct ip *);
+static int ip_pcbopts(int, struct mbuf **, struct mbuf *);
+static void imo_trace(struct ip_moptions *, int);
+static void ip_mloopback(struct ifnet *, struct ifnet *, struct mbuf *,
+ struct sockaddr_in *, int);
+static struct ifaddr *in_selectsrcif(struct ip *, struct route *, unsigned int);
extern struct ip_linklocal_stat ip_linklocal_stat;
extern int ipsec_bypass;
#endif
+static int ip_maxchainsent = 0;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, maxchainsent,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ip_maxchainsent, 0,
+ "use dlil_output_list");
+#if DEBUG
+static int forge_ce = 0;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, forge_ce,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &forge_ce, 0,
+ "Forge ECN CE");
+#endif /* DEBUG */
+
+static int ip_select_srcif_debug = 0;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, select_srcif_debug,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &ip_select_srcif_debug, 0,
+ "log source interface selection debug info");
+
+static int ip_output_measure = 0;
+SYSCTL_PROC(_net_inet_ip, OID_AUTO, output_perf,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED,
+ &ip_output_measure, 0, sysctl_reset_ip_output_stats, "I",
+ "Do time measurement");
+
+static uint64_t ip_output_measure_bins = 0;
+SYSCTL_PROC(_net_inet_ip, OID_AUTO, output_perf_bins,
+ CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &ip_output_measure_bins, 0,
+ sysctl_ip_output_measure_bins, "I",
+ "bins for chaining performance data histogram");
+
+static net_perf_t net_perf;
+SYSCTL_PROC(_net_inet_ip, OID_AUTO, output_perf_data,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED,
+ 0, 0, sysctl_ip_output_getperf, "S,net_perf",
+ "IP output performance data (struct net_perf, net/net_perf.h)");
+
+__private_extern__ int rfc6864 = 1;
+SYSCTL_INT(_net_inet_ip, OID_AUTO, rfc6864, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &rfc6864, 0, "updated ip id field behavior");
+
+#define IMO_TRACE_HIST_SIZE 32 /* size of trace history */
+
+/* For gdb */
+__private_extern__ unsigned int imo_trace_hist_size = IMO_TRACE_HIST_SIZE;
+
+struct ip_moptions_dbg {
+ struct ip_moptions imo; /* ip_moptions */
+ u_int16_t imo_refhold_cnt; /* # of IMO_ADDREF */
+ u_int16_t imo_refrele_cnt; /* # of IMO_REMREF */
+ /*
+ * Alloc and free callers.
+ */
+ ctrace_t imo_alloc;
+ ctrace_t imo_free;
+ /*
+ * Circular lists of IMO_ADDREF and IMO_REMREF callers.
+ */
+ ctrace_t imo_refhold[IMO_TRACE_HIST_SIZE];
+ ctrace_t imo_refrele[IMO_TRACE_HIST_SIZE];
+};
+
+#if DEBUG
+static unsigned int imo_debug = 1; /* debugging (enabled) */
+#else
+static unsigned int imo_debug; /* debugging (disabled) */
+#endif /* !DEBUG */
+static unsigned int imo_size; /* size of zone element */
+static struct zone *imo_zone; /* zone for ip_moptions */
+
+#define IMO_ZONE_MAX 64 /* maximum elements in zone */
+#define IMO_ZONE_NAME "ip_moptions" /* zone name */
+
/*
* IP output. The packet in mbuf chain m contains a skeletal IP
* header (with len, off, ttl, proto, tos, src, dst).
* The mbuf opt, if present, will not be freed.
*/
int
-ip_output(m0, opt, ro, flags, imo)
- struct mbuf *m0;
- struct mbuf *opt;
- struct route *ro;
- int flags;
- struct ip_moptions *imo;
+ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags,
+ struct ip_moptions *imo, struct ip_out_args *ipoa)
{
- struct ip *ip, *mhip;
- struct ifnet *ifp;
- u_long dl_tag;
- struct mbuf *m = m0;
+ return (ip_output_list(m0, 0, opt, ro, flags, imo, ipoa));
+}
+
+/*
+ * IP output. The packet in mbuf chain m contains a skeletal IP
+ * header (with len, off, ttl, proto, tos, src, dst).
+ * The mbuf chain containing the packet will be freed.
+ * The mbuf opt, if present, will not be freed.
+ *
+ * Route ro MUST be non-NULL; if ro->ro_rt is valid, route lookup would be
+ * skipped and ro->ro_rt would be used. Otherwise the result of route
+ * lookup is stored in ro->ro_rt.
+ *
+ * In the IP forwarding case, the packet will arrive with options already
+ * inserted, so must have a NULL opt pointer.
+ */
+int
+ip_output_list(struct mbuf *m0, int packetchain, struct mbuf *opt,
+ struct route *ro, int flags, struct ip_moptions *imo,
+ struct ip_out_args *ipoa)
+{
+ struct ip *ip;
+ struct ifnet *ifp = NULL; /* not refcnt'd */
+ struct mbuf *m = m0, *prevnxt = NULL, **mppn = &prevnxt;
int hlen = sizeof (struct ip);
- int len, off, error = 0;
- struct sockaddr_in *dst;
- struct in_ifaddr *ia = NULL;
- int isbroadcast, sw_csum;
+ int len = 0, error = 0;
+ struct sockaddr_in *dst = NULL;
+ struct in_ifaddr *ia = NULL, *src_ia = NULL;
+ struct in_addr pkt_dst;
+ struct ipf_pktopts *ippo = NULL;
+ ipfilter_t inject_filter_ref = NULL;
+ struct mbuf *packetlist;
+ uint32_t sw_csum, pktcnt = 0, scnt = 0, bytecnt = 0;
+ uint32_t packets_processed = 0;
+ unsigned int ifscope = IFSCOPE_NONE;
+ struct flowadv *adv = NULL;
+ struct timeval start_tv;
#if IPSEC
- struct route iproute;
struct socket *so = NULL;
struct secpolicy *sp = NULL;
-#endif
- u_int16_t divert_cookie; /* firewall cookie */
+#endif /* IPSEC */
+#if NECP
+ necp_kernel_policy_result necp_result = 0;
+ necp_kernel_policy_result_parameter necp_result_parameter;
+ necp_kernel_policy_id necp_matched_policy_id = 0;
+#endif /* NECP */
+#if IPFIREWALL
+ int ipfwoff;
+ struct sockaddr_in *next_hop_from_ipfwd_tag = NULL;
+#endif /* IPFIREWALL */
+#if IPFIREWALL || DUMMYNET
+ struct m_tag *tag;
+#endif /* IPFIREWALL || DUMMYNET */
+#if DUMMYNET
+ struct ip_out_args saved_ipoa;
+ struct sockaddr_in dst_buf;
+#endif /* DUMMYNET */
+ struct {
+#if IPSEC
+ struct ipsec_output_state ipsec_state;
+#endif /* IPSEC */
+#if NECP
+ struct route necp_route;
+#endif /* NECP */
+#if IPFIREWALL || DUMMYNET
+ struct ip_fw_args args;
+#endif /* IPFIREWALL || DUMMYNET */
#if IPFIREWALL_FORWARD
- int fwd_rewrite_src = 0;
-#endif
- struct ip_fw_chain *rule = NULL;
-
+ struct route sro_fwd;
+#endif /* IPFIREWALL_FORWARD */
+#if DUMMYNET
+ struct route saved_route;
+#endif /* DUMMYNET */
+ struct ipf_pktopts ipf_pktopts;
+ } ipobz;
+#define ipsec_state ipobz.ipsec_state
+#define necp_route ipobz.necp_route
+#define args ipobz.args
+#define sro_fwd ipobz.sro_fwd
+#define saved_route ipobz.saved_route
+#define ipf_pktopts ipobz.ipf_pktopts
+ union {
+ struct {
+ boolean_t select_srcif : 1; /* set once */
+ boolean_t srcbound : 1; /* set once */
+ boolean_t nocell : 1; /* set once */
+ boolean_t isbroadcast : 1;
+ boolean_t didfilter : 1;
+ boolean_t noexpensive : 1; /* set once */
+ boolean_t awdl_unrestricted : 1; /* set once */
+#if IPFIREWALL_FORWARD
+ boolean_t fwd_rewrite_src : 1;
+#endif /* IPFIREWALL_FORWARD */
+ };
+ uint32_t raw;
+ } ipobf = { .raw = 0 };
+
+/*
+ * Here we check for restrictions when sending frames.
+ * N.B.: IPv4 over internal co-processor interfaces is not allowed.
+ */
+#define IP_CHECK_RESTRICTIONS(_ifp, _ipobf) \
+ (((_ipobf).nocell && IFNET_IS_CELLULAR(_ifp)) || \
+ ((_ipobf).noexpensive && IFNET_IS_EXPENSIVE(_ifp)) || \
+ (IFNET_IS_INTCOPROC(_ifp)) || \
+ (!(_ipobf).awdl_unrestricted && IFNET_IS_AWDL_RESTRICTED(_ifp)))
+
+ if (ip_output_measure)
+ net_perf_start_time(&net_perf, &start_tv);
+ KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_START, 0, 0, 0, 0, 0);
+
+ VERIFY(m0->m_flags & M_PKTHDR);
+ packetlist = m0;
+
+ /* zero out {ipsec_state, args, sro_fwd, saved_route, ipf_pktops} */
+ bzero(&ipobz, sizeof (ipobz));
+ ippo = &ipf_pktopts;
+
+#if IPFIREWALL || DUMMYNET
+ if (SLIST_EMPTY(&m0->m_pkthdr.tags))
+ goto ipfw_tags_done;
+
+ /* Grab info from mtags prepended to the chain */
+#if DUMMYNET
+ if ((tag = m_tag_locate(m0, 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;
+ opt = NULL;
+ saved_route = dn_tag->dn_ro;
+ ro = &saved_route;
+
+ imo = NULL;
+ bcopy(&dn_tag->dn_dst, &dst_buf, sizeof (dst_buf));
+ dst = &dst_buf;
+ ifp = dn_tag->dn_ifp;
+ flags = dn_tag->dn_flags;
+ if ((dn_tag->dn_flags & IP_OUTARGS)) {
+ saved_ipoa = dn_tag->dn_ipoa;
+ ipoa = &saved_ipoa;
+ }
+
+ m_tag_delete(m0, tag);
+ }
+#endif /* DUMMYNET */
+
#if IPDIVERT
- /* Get and reset firewall cookie */
- divert_cookie = ip_divert_cookie;
- ip_divert_cookie = 0;
-#else
- divert_cookie = 0;
-#endif
+ if ((tag = m_tag_locate(m0, 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(m0, tag);
+ }
+#endif /* IPDIVERT */
+
+#if IPFIREWALL
+ if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_IPFORWARD, NULL)) != NULL) {
+ struct ip_fwd_tag *ipfwd_tag;
+
+ ipfwd_tag = (struct ip_fwd_tag *)(tag+1);
+ next_hop_from_ipfwd_tag = ipfwd_tag->next_hop;
+
+ m_tag_delete(m0, tag);
+ }
+#endif /* IPFIREWALL */
+
+ipfw_tags_done:
+#endif /* IPFIREWALL || DUMMYNET */
+
+ m = m0;
+ m->m_pkthdr.pkt_flags &= ~(PKTF_LOOP|PKTF_IFAINFO);
- KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
-
-#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) {
- /*
- * the packet was already tagged, so part of the
- * processing was already done, and we need to go down.
- * Get parameters from the header.
- */
- rule = (struct ip_fw_chain *)(m->m_data) ;
- opt = NULL ;
- ro = & ( ((struct dn_pkt *)m)->ro ) ;
- imo = NULL ;
- dst = ((struct dn_pkt *)m)->dn_dst ;
- ifp = ((struct dn_pkt *)m)->ifp ;
- flags = ((struct dn_pkt *)m)->flags ;
- m0 = m = m->m_next ;
#if IPSEC
- if (ipsec_bypass == 0) {
- so = ipsec_getsocket(m);
- (void)ipsec_setsocket(m, NULL);
- }
-#endif
- ip = mtod(m, struct ip *);
- hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
- if (ro->ro_rt != NULL)
- ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa;
- goto sendit;
- } else
- rule = NULL ;
-#endif
+ if (ipsec_bypass == 0 && !(flags & IP_NOIPSEC)) {
+ /* If packet is bound to an interface, check bound policies */
+ if ((flags & IP_OUTARGS) && (ipoa != NULL) &&
+ (ipoa->ipoa_flags & IPOAF_BOUND_IF) &&
+ ipoa->ipoa_boundif != IFSCOPE_NONE) {
+ if (ipsec4_getpolicybyinterface(m, IPSEC_DIR_OUTBOUND,
+ &flags, ipoa, &sp) != 0)
+ goto bad;
+ }
+ }
+#endif /* IPSEC */
+
+ VERIFY(ro != NULL);
+
+ if (flags & IP_OUTARGS) {
+ /*
+ * In the forwarding case, only the ifscope value is used,
+ * as source interface selection doesn't take place.
+ */
+ if ((ipobf.select_srcif = (!(flags & IP_FORWARDING) &&
+ (ipoa->ipoa_flags & IPOAF_SELECT_SRCIF)))) {
+ ipf_pktopts.ippo_flags |= IPPOF_SELECT_SRCIF;
+ }
+
+ if ((ipoa->ipoa_flags & IPOAF_BOUND_IF) &&
+ ipoa->ipoa_boundif != IFSCOPE_NONE) {
+ ifscope = ipoa->ipoa_boundif;
+ ipf_pktopts.ippo_flags |=
+ (IPPOF_BOUND_IF | (ifscope << IPPOF_SHIFT_IFSCOPE));
+ }
+
+ /* double negation needed for bool bit field */
+ ipobf.srcbound = !!(ipoa->ipoa_flags & IPOAF_BOUND_SRCADDR);
+ if (ipobf.srcbound)
+ ipf_pktopts.ippo_flags |= IPPOF_BOUND_SRCADDR;
+ } else {
+ ipobf.select_srcif = FALSE;
+ ipobf.srcbound = FALSE;
+ ifscope = IFSCOPE_NONE;
+ if (flags & IP_OUTARGS) {
+ ipoa->ipoa_boundif = IFSCOPE_NONE;
+ ipoa->ipoa_flags &= ~(IPOAF_SELECT_SRCIF |
+ IPOAF_BOUND_IF | IPOAF_BOUND_SRCADDR);
+ }
+ }
+
+ if (flags & IP_OUTARGS) {
+ if (ipoa->ipoa_flags & IPOAF_NO_CELLULAR) {
+ ipobf.nocell = TRUE;
+ ipf_pktopts.ippo_flags |= IPPOF_NO_IFT_CELLULAR;
+ }
+ if (ipoa->ipoa_flags & IPOAF_NO_EXPENSIVE) {
+ ipobf.noexpensive = TRUE;
+ ipf_pktopts.ippo_flags |= IPPOF_NO_IFF_EXPENSIVE;
+ }
+ if (ipoa->ipoa_flags & IPOAF_AWDL_UNRESTRICTED)
+ ipobf.awdl_unrestricted = TRUE;
+ adv = &ipoa->ipoa_flowadv;
+ adv->code = FADV_SUCCESS;
+ ipoa->ipoa_retflags = 0;
+ }
+
#if IPSEC
- if (ipsec_bypass == 0) {
+ if (ipsec_bypass == 0 && !(flags & IP_NOIPSEC)) {
so = ipsec_getsocket(m);
- (void)ipsec_setsocket(m, NULL);
+ if (so != NULL) {
+ (void) ipsec_setsocket(m, NULL);
+ }
}
-#endif
+#endif /* IPSEC */
+
+#if DUMMYNET
+ if (args.fwa_ipfw_rule != NULL || args.fwa_pf_rule != NULL) {
+ /* dummynet already saw us */
+ ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ pkt_dst = ip->ip_dst;
+ if (ro->ro_rt != NULL) {
+ RT_LOCK_SPIN(ro->ro_rt);
+ ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa;
+ if (ia) {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro->ro_rt);
+ IFA_ADDREF(&ia->ia_ifa);
+ }
+ RT_UNLOCK(ro->ro_rt);
+ }
+
+#if IPFIREWALL
+ if (args.fwa_ipfw_rule != NULL)
+ goto skip_ipsec;
+#endif /* IPFIREWALL */
+ if (args.fwa_pf_rule != NULL)
+ goto sendit;
+ }
+#endif /* DUMMYNET */
+
+loopit:
+ packets_processed++;
+ ipobf.isbroadcast = FALSE;
+ ipobf.didfilter = FALSE;
+#if IPFIREWALL_FORWARD
+ ipobf.fwd_rewrite_src = FALSE;
+#endif /* IPFIREWALL_FORWARD */
+
+ VERIFY(m->m_flags & M_PKTHDR);
+ /*
+ * No need to proccess packet twice if we've already seen it.
+ */
+ if (!SLIST_EMPTY(&m->m_pkthdr.tags))
+ inject_filter_ref = ipf_get_inject_filter(m);
+ else
+ inject_filter_ref = NULL;
-#if DIAGNOSTIC
- if ((m->m_flags & M_PKTHDR) == 0)
- panic("ip_output no HDR");
- if (!ro)
- panic("ip_output no route, proto = %d",
- mtod(m, struct ip *)->ip_p);
-#endif
if (opt) {
m = ip_insertoptions(m, opt, &len);
hlen = len;
+ /* Update the chain */
+ if (m != m0) {
+ if (m0 == packetlist)
+ packetlist = m;
+ m0 = m;
+ }
}
ip = mtod(m, struct ip *);
+
+#if IPFIREWALL
+ /*
+ * rdar://8542331
+ *
+ * When dealing with a packet chain, we need to reset "next_hop"
+ * because "dst" may have been changed to the gateway address below
+ * for the previous packet of the chain. This could cause the route
+ * to be inavertandly changed to the route to the gateway address
+ * (instead of the route to the destination).
+ */
+ args.fwa_next_hop = next_hop_from_ipfwd_tag;
+ pkt_dst = args.fwa_next_hop ? args.fwa_next_hop->sin_addr : ip->ip_dst;
+#else /* !IPFIREWALL */
+ pkt_dst = ip->ip_dst;
+#endif /* !IPFIREWALL */
+
+ /*
+ * We must not send if the packet is destined to network zero.
+ * RFC1122 3.2.1.3 (a) and (b).
+ */
+ if (IN_ZERONET(ntohl(pkt_dst.s_addr))) {
+ error = EHOSTUNREACH;
+ goto bad;
+ }
+
/*
* Fill in IP header.
*/
- if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
+ if (!(flags & (IP_FORWARDING|IP_RAWOUTPUT))) {
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
ip->ip_off &= IP_DF;
-#if RANDOM_IP_ID
- ip->ip_id = ip_randomid();
-#else
- ip->ip_id = htons(ip_id++);
-#endif
- ipstat.ips_localout++;
+ if (rfc6864 && IP_OFF_IS_ATOMIC(ip->ip_off)) {
+ // Per RFC6864, value of ip_id is undefined for atomic ip packets
+ ip->ip_id = 0;
+ } else {
+ ip->ip_id = ip_randomid();
+ }
+ OSAddAtomic(1, &ipstat.ips_localout);
} else {
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
}
- 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 DEBUG
+ /* For debugging, we let the stack forge congestion */
+ if (forge_ce != 0 &&
+ ((ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_ECT1 ||
+ (ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_ECT0)) {
+ ip->ip_tos = (ip->ip_tos & ~IPTOS_ECN_MASK) | IPTOS_ECN_CE;
+ forge_ce--;
+ }
+#endif /* DEBUG */
+
+ KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr, ip->ip_src.s_addr,
+ ip->ip_p, ip->ip_off, ip->ip_len);
+
+ dst = SIN(&ro->ro_dst);
- dst = (struct sockaddr_in *)&ro->ro_dst;
/*
* If there is a cached route,
* check that it is to the same destination
* and is still up. If not, free it and try again.
+ * The address family should also be checked in case of sharing the
+ * cache with IPv6.
*/
- if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
- dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
- rtfree(ro->ro_rt);
- ro->ro_rt = (struct rtentry *)0;
+
+ if (ro->ro_rt != NULL) {
+ if (ROUTE_UNUSABLE(ro) && ip->ip_src.s_addr != INADDR_ANY &&
+ !(flags & (IP_ROUTETOIF | IP_FORWARDING))) {
+ src_ia = ifa_foraddr(ip->ip_src.s_addr);
+ if (src_ia == NULL) {
+ error = EADDRNOTAVAIL;
+ goto bad;
+ }
+ IFA_REMREF(&src_ia->ia_ifa);
+ src_ia = NULL;
+ }
+ /*
+ * Test rt_flags without holding rt_lock for performance
+ * reasons; if the route is down it will hopefully be
+ * caught by the layer below (since it uses this route
+ * as a hint) or during the next transmit.
+ */
+ if (ROUTE_UNUSABLE(ro) || dst->sin_family != AF_INET ||
+ dst->sin_addr.s_addr != pkt_dst.s_addr)
+ ROUTE_RELEASE(ro);
+
+ /*
+ * If we're doing source interface selection, we may not
+ * want to use this route; only synch up the generation
+ * count otherwise.
+ */
+ if (!ipobf.select_srcif && ro->ro_rt != NULL &&
+ RT_GENID_OUTOFSYNC(ro->ro_rt))
+ RT_GENID_SYNC(ro->ro_rt);
}
- if (ro->ro_rt == 0) {
+ if (ro->ro_rt == NULL) {
+ bzero(dst, sizeof (*dst));
dst->sin_family = AF_INET;
- dst->sin_len = sizeof(*dst);
- dst->sin_addr = ip->ip_dst;
+ dst->sin_len = sizeof (*dst);
+ dst->sin_addr = pkt_dst;
}
/*
* If routing to interface only,
* short circuit routing lookup.
*/
-#define ifatoia(ifa) ((struct in_ifaddr *)(ifa))
-#define sintosa(sin) ((struct sockaddr *)(sin))
if (flags & IP_ROUTETOIF) {
- if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0 &&
- (ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
- ipstat.ips_noroute++;
- error = ENETUNREACH;
- goto bad;
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+ if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == NULL) {
+ ia = ifatoia(ifa_ifwithnet(sintosa(dst)));
+ if (ia == NULL) {
+ OSAddAtomic(1, &ipstat.ips_noroute);
+ error = ENETUNREACH;
+ /* XXX IPv6 APN fallback notification?? */
+ goto bad;
+ }
}
ifp = ia->ia_ifp;
- dl_tag = ia->ia_ifa.ifa_dlt;
ip->ip_ttl = 1;
- isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ ipobf.isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ /*
+ * For consistency with other cases below. Loopback
+ * multicast case is handled separately by ip_mloopback().
+ */
+ if ((ifp->if_flags & IFF_LOOPBACK) &&
+ !IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
+ m->m_pkthdr.rcvif = ifp;
+ ip_setsrcifaddr_info(m, ifp->if_index, NULL);
+ ip_setdstifaddr_info(m, ifp->if_index, NULL);
+ }
+ } else if (IN_MULTICAST(ntohl(pkt_dst.s_addr)) &&
+ imo != NULL && (ifp = imo->imo_multicast_ifp) != NULL) {
+ /*
+ * Bypass the normal routing lookup for multicast
+ * packets if the interface is specified.
+ */
+ ipobf.isbroadcast = FALSE;
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+
+ /* Macro takes reference on ia */
+ IFP_TO_IA(ifp, ia);
} else {
+ struct ifaddr *ia0 = NULL;
+ boolean_t cloneok = FALSE;
+ /*
+ * Perform source interface selection; the source IP address
+ * must belong to one of the addresses of the interface used
+ * by the route. For performance reasons, do this only if
+ * there is no route, or if the routing table has changed,
+ * or if we haven't done source interface selection on this
+ * route (for this PCB instance) before.
+ */
+ if (ipobf.select_srcif &&
+ ip->ip_src.s_addr != INADDR_ANY && (ROUTE_UNUSABLE(ro) ||
+ !(ro->ro_flags & ROF_SRCIF_SELECTED))) {
+ /* Find the source interface */
+ ia0 = in_selectsrcif(ip, ro, ifscope);
+
+ /*
+ * If the source address belongs to a restricted
+ * interface and the caller forbids our using
+ * interfaces of such type, pretend that there is no
+ * route.
+ */
+ if (ia0 != NULL &&
+ IP_CHECK_RESTRICTIONS(ia0->ifa_ifp, ipobf)) {
+ IFA_REMREF(ia0);
+ ia0 = NULL;
+ error = EHOSTUNREACH;
+ if (flags & IP_OUTARGS)
+ ipoa->ipoa_retflags |= IPOARF_IFDENIED;
+ goto bad;
+ }
+
+ /*
+ * If the source address is spoofed (in the case of
+ * IP_RAWOUTPUT on an unbounded socket), or if this
+ * is destined for local/loopback, just let it go out
+ * using the interface of the route. Otherwise,
+ * there's no interface having such an address,
+ * so bail out.
+ */
+ if (ia0 == NULL && (!(flags & IP_RAWOUTPUT) ||
+ ipobf.srcbound) && ifscope != lo_ifp->if_index) {
+ error = EADDRNOTAVAIL;
+ goto bad;
+ }
+
+ /*
+ * If the caller didn't explicitly specify the scope,
+ * pick it up from the source interface. If the cached
+ * route was wrong and was blown away as part of source
+ * interface selection, don't mask out RTF_PRCLONING
+ * since that route may have been allocated by the ULP,
+ * unless the IP header was created by the caller or
+ * the destination is IPv4 LLA. The check for the
+ * latter is needed because IPv4 LLAs are never scoped
+ * in the current implementation, and we don't want to
+ * replace the resolved IPv4 LLA route with one whose
+ * gateway points to that of the default gateway on
+ * the primary interface of the system.
+ */
+ if (ia0 != NULL) {
+ if (ifscope == IFSCOPE_NONE)
+ ifscope = ia0->ifa_ifp->if_index;
+ cloneok = (!(flags & IP_RAWOUTPUT) &&
+ !(IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))));
+ }
+ }
+
/*
* If this is the case, we probably don't want to allocate
* a protocol-cloned route since we didn't get one from the
* the link layer, as this is probably required in all cases
* for correct operation (as it is for ARP).
*/
- if (ro->ro_rt == 0)
- rtalloc_ign(ro, RTF_PRCLONING);
- if (ro->ro_rt == 0) {
- ipstat.ips_noroute++;
+ if (ro->ro_rt == NULL) {
+ unsigned long ign = RTF_PRCLONING;
+ /*
+ * We make an exception here: if the destination
+ * address is INADDR_BROADCAST, allocate a protocol-
+ * cloned host route so that we end up with a route
+ * marked with the RTF_BROADCAST flag. Otherwise,
+ * we would end up referring to the default route,
+ * instead of creating a cloned host route entry.
+ * That would introduce inconsistencies between ULPs
+ * that allocate a route and those that don't. The
+ * RTF_BROADCAST route is important since we'd want
+ * to send out undirected IP broadcast packets using
+ * link-level broadcast address. Another exception
+ * is for ULP-created routes that got blown away by
+ * source interface selection (see above).
+ *
+ * These exceptions will no longer be necessary when
+ * the RTF_PRCLONING scheme is no longer present.
+ */
+ if (cloneok || dst->sin_addr.s_addr == INADDR_BROADCAST)
+ ign &= ~RTF_PRCLONING;
+
+ /*
+ * Loosen the route lookup criteria if the ifscope
+ * corresponds to the loopback interface; this is
+ * needed to support Application Layer Gateways
+ * listening on loopback, in conjunction with packet
+ * filter redirection rules. The final source IP
+ * address will be rewritten by the packet filter
+ * prior to the RFC1122 loopback check below.
+ */
+ if (ifscope == lo_ifp->if_index)
+ rtalloc_ign(ro, ign);
+ else
+ rtalloc_scoped_ign(ro, ign, ifscope);
+
+ /*
+ * If the route points to a cellular/expensive interface
+ * and the caller forbids our using interfaces of such type,
+ * pretend that there is no route.
+ */
+ if (ro->ro_rt != NULL) {
+ RT_LOCK_SPIN(ro->ro_rt);
+ if (IP_CHECK_RESTRICTIONS(ro->ro_rt->rt_ifp,
+ ipobf)) {
+ RT_UNLOCK(ro->ro_rt);
+ ROUTE_RELEASE(ro);
+ if (flags & IP_OUTARGS) {
+ ipoa->ipoa_retflags |=
+ IPOARF_IFDENIED;
+ }
+ } else {
+ RT_UNLOCK(ro->ro_rt);
+ }
+ }
+ }
+
+ if (ro->ro_rt == NULL) {
+ OSAddAtomic(1, &ipstat.ips_noroute);
error = EHOSTUNREACH;
+ if (ia0 != NULL) {
+ IFA_REMREF(ia0);
+ ia0 = NULL;
+ }
goto bad;
}
+
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+ RT_LOCK_SPIN(ro->ro_rt);
ia = ifatoia(ro->ro_rt->rt_ifa);
+ if (ia != NULL) {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro->ro_rt);
+ IFA_ADDREF(&ia->ia_ifa);
+ }
+ /*
+ * Note: ia_ifp may not be the same as rt_ifp; the latter
+ * is what we use for determining outbound i/f, mtu, etc.
+ */
ifp = ro->ro_rt->rt_ifp;
- dl_tag = ro->ro_rt->rt_dlt;
ro->ro_rt->rt_use++;
- if (ro->ro_rt->rt_flags & RTF_GATEWAY)
- dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
- if (ro->ro_rt->rt_flags & RTF_HOST)
- isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
- else
- isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ if (ro->ro_rt->rt_flags & RTF_GATEWAY) {
+ dst = SIN(ro->ro_rt->rt_gateway);
+ }
+ if (ro->ro_rt->rt_flags & RTF_HOST) {
+ /* double negation needed for bool bit field */
+ ipobf.isbroadcast =
+ !!(ro->ro_rt->rt_flags & RTF_BROADCAST);
+ } else {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro->ro_rt);
+ ipobf.isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ }
+ /*
+ * For consistency with IPv6, as well as to ensure that
+ * IP_RECVIF is set correctly for packets that are sent
+ * to one of the local addresses. ia (rt_ifa) would have
+ * been fixed up by rt_setif for local routes. This
+ * would make it appear as if the packet arrives on the
+ * interface which owns the local address. Loopback
+ * multicast case is handled separately by ip_mloopback().
+ */
+ if (ia != NULL && (ifp->if_flags & IFF_LOOPBACK) &&
+ !IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
+ uint32_t srcidx;
+
+ m->m_pkthdr.rcvif = ia->ia_ifa.ifa_ifp;
+
+ if (ia0 != NULL)
+ srcidx = ia0->ifa_ifp->if_index;
+ else if ((ro->ro_flags & ROF_SRCIF_SELECTED) &&
+ ro->ro_srcia != NULL)
+ srcidx = ro->ro_srcia->ifa_ifp->if_index;
+ else
+ srcidx = 0;
+
+ ip_setsrcifaddr_info(m, srcidx, NULL);
+ ip_setdstifaddr_info(m, 0, ia);
+ }
+ RT_UNLOCK(ro->ro_rt);
+ if (ia0 != NULL) {
+ IFA_REMREF(ia0);
+ ia0 = NULL;
+ }
}
- if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
+
+ if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
+ struct ifnet *srcifp = NULL;
struct in_multi *inm;
+ u_int32_t vif = 0;
+ u_int8_t ttl = IP_DEFAULT_MULTICAST_TTL;
+ u_int8_t loop = IP_DEFAULT_MULTICAST_LOOP;
m->m_flags |= M_MCAST;
/*
* still points to the address in "ro". (It may have been
* changed to point to a gateway address, above.)
*/
- dst = (struct sockaddr_in *)&ro->ro_dst;
+ dst = SIN(&ro->ro_dst);
/*
* See if the caller provided any multicast options
*/
if (imo != NULL) {
- ip->ip_ttl = imo->imo_multicast_ttl;
- if (imo->imo_multicast_ifp != NULL) {
+ IMO_LOCK(imo);
+ vif = imo->imo_multicast_vif;
+ ttl = imo->imo_multicast_ttl;
+ loop = imo->imo_multicast_loop;
+ if (!(flags & IP_RAWOUTPUT))
+ ip->ip_ttl = ttl;
+ if (imo->imo_multicast_ifp != NULL)
ifp = imo->imo_multicast_ifp;
- dl_tag = ifp->if_data.default_proto;
- }
- if (imo->imo_multicast_vif != -1)
- ip->ip_src.s_addr =
- ip_mcast_src(imo->imo_multicast_vif);
- } else
- ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
+ IMO_UNLOCK(imo);
+ } else if (!(flags & IP_RAWOUTPUT)) {
+ vif = -1;
+ ip->ip_ttl = ttl;
+ }
/*
* Confirm that the outgoing interface supports multicast.
*/
- if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
- if ((ifp->if_flags & IFF_MULTICAST) == 0) {
- ipstat.ips_noroute++;
+ if (imo == NULL || vif == -1) {
+ if (!(ifp->if_flags & IFF_MULTICAST)) {
+ OSAddAtomic(1, &ipstat.ips_noroute);
error = ENETUNREACH;
goto bad;
}
* of outgoing interface.
*/
if (ip->ip_src.s_addr == INADDR_ANY) {
- register struct in_ifaddr *ia1;
-
- TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link)
+ struct in_ifaddr *ia1;
+ lck_rw_lock_shared(in_ifaddr_rwlock);
+ TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link) {
+ IFA_LOCK_SPIN(&ia1->ia_ifa);
if (ia1->ia_ifp == ifp) {
ip->ip_src = IA_SIN(ia1)->sin_addr;
+ srcifp = ifp;
+ IFA_UNLOCK(&ia1->ia_ifa);
break;
}
+ IFA_UNLOCK(&ia1->ia_ifa);
+ }
+ lck_rw_done(in_ifaddr_rwlock);
+ if (ip->ip_src.s_addr == INADDR_ANY) {
+ error = ENETUNREACH;
+ goto bad;
+ }
}
- IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm);
- if (inm != NULL &&
- (imo == NULL || imo->imo_multicast_loop)) {
+ in_multihead_lock_shared();
+ IN_LOOKUP_MULTI(&pkt_dst, ifp, inm);
+ in_multihead_lock_done();
+ if (inm != NULL && (imo == NULL || loop)) {
/*
* If we belong to the destination multicast group
* on the outgoing interface, and the caller did not
* forbid loopback, loop back a copy.
*/
- ip_mloopback(ifp, m, dst, hlen);
- }
- else {
- /*
- * If we are acting as a multicast router, perform
- * multicast forwarding as if the packet had just
- * arrived on the interface to which we are about
- * to send. The multicast forwarding function
- * recursively calls this function, using the
- * IP_FORWARDING flag to prevent infinite recursion.
- *
- * Multicasts that are looped back by ip_mloopback(),
- * above, will be forwarded by the ip_input() routine,
- * if necessary.
- */
- if (ip_mrouter && (flags & IP_FORWARDING) == 0) {
+ if (!TAILQ_EMPTY(&ipv4_filters)) {
+ struct ipfilter *filter;
+ int seen = (inject_filter_ref == NULL);
+
+ if (imo != NULL) {
+ ipf_pktopts.ippo_flags |=
+ IPPOF_MCAST_OPTS;
+ ipf_pktopts.ippo_mcast_ifnet = ifp;
+ ipf_pktopts.ippo_mcast_ttl = ttl;
+ ipf_pktopts.ippo_mcast_loop = loop;
+ }
+
+ ipf_ref();
+
/*
- * Check if rsvp daemon is running. If not, don't
- * set ip_moptions. This ensures that the packet
- * is multicast and not just sent down one link
- * as prescribed by rsvpd.
+ * 4135317 - always pass network byte
+ * order to filter
*/
- if (!rsvp_on)
- imo = NULL;
- if (ip_mforward(ip, ifp, m, imo) != 0) {
- m_freem(m);
- goto done;
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+ TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) {
+ if (seen == 0) {
+ if ((struct ipfilter *)
+ inject_filter_ref == filter)
+ seen = 1;
+ } else if (filter->ipf_filter.
+ ipf_output != NULL) {
+ errno_t result;
+ result = filter->ipf_filter.
+ ipf_output(filter->
+ ipf_filter.cookie,
+ (mbuf_t *)&m, ippo);
+ if (result == EJUSTRETURN) {
+ ipf_unref();
+ INM_REMREF(inm);
+ goto done;
+ }
+ if (result != 0) {
+ ipf_unref();
+ INM_REMREF(inm);
+ goto bad;
+ }
+ }
}
+
+ /* set back to host byte order */
+ ip = mtod(m, struct ip *);
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_len);
+ NTOHS(ip->ip_off);
+#endif
+ ipf_unref();
+ ipobf.didfilter = TRUE;
}
+ ip_mloopback(srcifp, ifp, m, dst, hlen);
}
-
+ if (inm != NULL)
+ INM_REMREF(inm);
/*
* Multicasts with a time-to-live of zero may be looped-
* back, above, but must not be transmitted on a network.
goto sendit;
}
-#ifndef notdef
/*
* If source address not specified yet, use address
* of outgoing interface.
*/
if (ip->ip_src.s_addr == INADDR_ANY) {
+ IFA_LOCK_SPIN(&ia->ia_ifa);
ip->ip_src = IA_SIN(ia)->sin_addr;
+ IFA_UNLOCK(&ia->ia_ifa);
#if IPFIREWALL_FORWARD
- /* Keep note that we did this - if the firewall changes
+ /*
+ * Keep note that we did this - if the firewall changes
* the next-hop, our interface may change, changing the
* default source IP. It's a shame so much effort happens
- * twice. Oh well.
+ * twice. Oh well.
*/
- fwd_rewrite_src++;
+ ipobf.fwd_rewrite_src = TRUE;
#endif /* IPFIREWALL_FORWARD */
}
-#endif /* notdef */
- /*
- * Verify that we have any chance at all of being able to queue
- * the packet or packet fragments
- */
- if ((ifp->if_snd.ifq_len + ip->ip_len / ifp->if_mtu + 1) >=
- ifp->if_snd.ifq_maxlen) {
- error = ENOBUFS;
- goto bad;
- }
/*
* Look for broadcast address and
* and verify user is allowed to send
* such a packet.
*/
- if (isbroadcast) {
- if ((ifp->if_flags & IFF_BROADCAST) == 0) {
+ if (ipobf.isbroadcast) {
+ if (!(ifp->if_flags & IFF_BROADCAST)) {
error = EADDRNOTAVAIL;
goto bad;
}
- if ((flags & IP_ALLOWBROADCAST) == 0) {
+ if (!(flags & IP_ALLOWBROADCAST)) {
error = EACCES;
goto bad;
}
}
sendit:
- /*
- * Force IP TTL to 255 following draft-ietf-zeroconf-ipv4-linklocal.txt
- */
- if (IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)) || IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
- ip_linklocal_stat.iplls_out_total++;
- if (ip->ip_ttl != MAXTTL) {
- ip_linklocal_stat.iplls_out_badttl++;
- ip->ip_ttl = MAXTTL;
- }
- }
-
-#if IPSEC
- /* temporary for testing only: bypass ipsec alltogether */
-
- if (ipsec_bypass != 0)
- goto skip_ipsec;
+#if PF
+ /* Invoke outbound packet filter */
+ if (PF_IS_ENABLED) {
+ int rc;
- /* get SP for this packet */
- if (so == NULL)
- sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
- else
- sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
+ m0 = m; /* Save for later */
+#if DUMMYNET
+ args.fwa_m = m;
+ args.fwa_next_hop = dst;
+ args.fwa_oif = ifp;
+ args.fwa_ro = ro;
+ args.fwa_dst = dst;
+ args.fwa_oflags = flags;
+ if (flags & IP_OUTARGS)
+ args.fwa_ipoa = ipoa;
+ rc = pf_af_hook(ifp, mppn, &m, AF_INET, FALSE, &args);
+#else /* DUMMYNET */
+ rc = pf_af_hook(ifp, mppn, &m, AF_INET, FALSE, NULL);
+#endif /* DUMMYNET */
+ if (rc != 0 || m == NULL) {
+ /* Move to the next packet */
+ m = *mppn;
+
+ /* Skip ahead if first packet in list got dropped */
+ if (packetlist == m0)
+ packetlist = m;
+
+ if (m != NULL) {
+ m0 = m;
+ /* Next packet in the chain */
+ goto loopit;
+ } else if (packetlist != NULL) {
+ /* No more packet; send down the chain */
+ goto sendchain;
+ }
+ /* Nothing left; we're done */
+ goto done;
+ }
+ m0 = m;
+ ip = mtod(m, struct ip *);
+ pkt_dst = ip->ip_dst;
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ }
+#endif /* PF */
+ /*
+ * Force IP TTL to 255 following draft-ietf-zeroconf-ipv4-linklocal.txt
+ */
+ if (IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)) ||
+ IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
+ ip_linklocal_stat.iplls_out_total++;
+ if (ip->ip_ttl != MAXTTL) {
+ ip_linklocal_stat.iplls_out_badttl++;
+ ip->ip_ttl = MAXTTL;
+ }
+ }
- if (sp == NULL) {
- ipsecstat.out_inval++;
+ if (!ipobf.didfilter && !TAILQ_EMPTY(&ipv4_filters)) {
+ struct ipfilter *filter;
+ int seen = (inject_filter_ref == NULL);
+ ipf_pktopts.ippo_flags &= ~IPPOF_MCAST_OPTS;
+
+ /*
+ * Check that a TSO frame isn't passed to a filter.
+ * This could happen if a filter is inserted while
+ * TCP is sending the TSO packet.
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) {
+ error = EMSGSIZE;
+ goto bad;
+ }
+
+ ipf_ref();
+
+ /* 4135317 - always pass network byte order to filter */
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+ TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) {
+ if (seen == 0) {
+ if ((struct ipfilter *)inject_filter_ref ==
+ filter)
+ seen = 1;
+ } else if (filter->ipf_filter.ipf_output) {
+ errno_t result;
+ result = filter->ipf_filter.
+ ipf_output(filter->ipf_filter.cookie,
+ (mbuf_t *)&m, ippo);
+ if (result == EJUSTRETURN) {
+ ipf_unref();
+ goto done;
+ }
+ if (result != 0) {
+ ipf_unref();
+ goto bad;
+ }
+ }
+ }
+ /* set back to host byte order */
+ ip = mtod(m, struct ip *);
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_len);
+ NTOHS(ip->ip_off);
+#endif
+ ipf_unref();
+ }
+
+#if NECP
+ /* Process Network Extension Policy. Will Pass, Drop, or Rebind packet. */
+ necp_matched_policy_id = necp_ip_output_find_policy_match (m,
+ flags, (flags & IP_OUTARGS) ? ipoa : NULL, &necp_result, &necp_result_parameter);
+ if (necp_matched_policy_id) {
+ necp_mark_packet_from_ip(m, necp_matched_policy_id);
+ switch (necp_result) {
+ case NECP_KERNEL_POLICY_RESULT_PASS:
+ /* Check if the interface is allowed */
+ if (!necp_packet_is_allowed_over_interface(m, ifp)) {
+ error = EHOSTUNREACH;
+ OSAddAtomic(1, &ipstat.ips_necp_policy_drop);
+ goto bad;
+ }
+ goto skip_ipsec;
+ case NECP_KERNEL_POLICY_RESULT_DROP:
+ case NECP_KERNEL_POLICY_RESULT_SOCKET_DIVERT:
+ /* Flow divert packets should be blocked at the IP layer */
+ error = EHOSTUNREACH;
+ OSAddAtomic(1, &ipstat.ips_necp_policy_drop);
+ goto bad;
+ case NECP_KERNEL_POLICY_RESULT_IP_TUNNEL: {
+ /* Verify that the packet is being routed to the tunnel */
+ struct ifnet *policy_ifp = necp_get_ifnet_from_result_parameter(&necp_result_parameter);
+ if (policy_ifp == ifp) {
+ /* Check if the interface is allowed */
+ if (!necp_packet_is_allowed_over_interface(m, ifp)) {
+ error = EHOSTUNREACH;
+ OSAddAtomic(1, &ipstat.ips_necp_policy_drop);
+ goto bad;
+ }
+ goto skip_ipsec;
+ } else {
+ if (necp_packet_can_rebind_to_ifnet(m, policy_ifp, &necp_route, AF_INET)) {
+ /* Check if the interface is allowed */
+ if (!necp_packet_is_allowed_over_interface(m, policy_ifp)) {
+ error = EHOSTUNREACH;
+ OSAddAtomic(1, &ipstat.ips_necp_policy_drop);
+ goto bad;
+ }
+
+ /* Set ifp to the tunnel interface, since it is compatible with the packet */
+ ifp = policy_ifp;
+ ro = &necp_route;
+ goto skip_ipsec;
+ } else {
+ error = ENETUNREACH;
+ OSAddAtomic(1, &ipstat.ips_necp_policy_drop);
+ goto bad;
+ }
+ }
+ }
+ default:
+ break;
+ }
+ }
+ /* Catch-all to check if the interface is allowed */
+ if (!necp_packet_is_allowed_over_interface(m, ifp)) {
+ error = EHOSTUNREACH;
+ OSAddAtomic(1, &ipstat.ips_necp_policy_drop);
goto bad;
}
+#endif /* NECP */
+
+#if IPSEC
+ if (ipsec_bypass != 0 || (flags & IP_NOIPSEC))
+ goto skip_ipsec;
+
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_START, 0, 0, 0, 0, 0);
+
+ if (sp == NULL) {
+ /* get SP for this packet */
+ if (so != NULL) {
+ sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND,
+ so, &error);
+ } else {
+ sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND,
+ flags, &error);
+ }
+ if (sp == NULL) {
+ IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 0, 0, 0, 0, 0);
+ goto bad;
+ }
+ }
error = 0;
/* check policy */
switch (sp->policy) {
case IPSEC_POLICY_DISCARD:
+ case IPSEC_POLICY_GENERATE:
/*
* This packet is just discarded.
*/
- ipsecstat.out_polvio++;
+ IPSEC_STAT_INCREMENT(ipsecstat.out_polvio);
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 1, 0, 0, 0, 0);
goto bad;
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
/* no need to do IPsec. */
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 2, 0, 0, 0, 0);
goto skip_ipsec;
-
+
case IPSEC_POLICY_IPSEC:
if (sp->req == NULL) {
/* acquire a policy */
error = key_spdacquire(sp);
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 3, 0, 0, 0, 0);
+ goto bad;
+ }
+ if (sp->ipsec_if) {
+ /* Verify the redirect to ipsec interface */
+ if (sp->ipsec_if == ifp) {
+ goto skip_ipsec;
+ }
goto bad;
}
break;
default:
printf("ip_output: Invalid policy found. %d\n", sp->policy);
}
- {
- struct ipsec_output_state state;
- bzero(&state, sizeof(state));
- state.m = m;
+ {
+ ipsec_state.m = m;
if (flags & IP_ROUTETOIF) {
- state.ro = &iproute;
- bzero(&iproute, sizeof(iproute));
- } else
- state.ro = ro;
- state.dst = (struct sockaddr *)dst;
+ bzero(&ipsec_state.ro, sizeof (ipsec_state.ro));
+ } else {
+ route_copyout((struct route *)&ipsec_state.ro, ro, sizeof (struct route));
+ }
+ ipsec_state.dst = SA(dst);
ip->ip_sum = 0;
* XXX
* delayed checksums are not currently compatible with IPsec
*/
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
in_delayed_cksum(m);
- m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
- }
+#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
+#endif
+
+ DTRACE_IP6(send, struct mbuf *, m, struct inpcb *, NULL,
+ struct ip *, ip, struct ifnet *, ifp,
+ struct ip *, ip, struct ip6_hdr *, NULL);
+
+ error = ipsec4_output(&ipsec_state, sp, flags);
+ if (ipsec_state.tunneled == 6) {
+ m0 = m = NULL;
+ error = 0;
+ goto bad;
+ }
+
+ m0 = m = ipsec_state.m;
- error = ipsec4_output(&state, sp, flags);
+#if DUMMYNET
+ /*
+ * If we're about to use the route in ipsec_state
+ * and this came from dummynet, cleaup now.
+ */
+ if (ro == &saved_route &&
+ (!(flags & IP_ROUTETOIF) || ipsec_state.tunneled))
+ ROUTE_RELEASE(ro);
+#endif /* DUMMYNET */
- m = state.m;
if (flags & IP_ROUTETOIF) {
/*
* if we have tunnel mode SA, we may need to ignore
* IP_ROUTETOIF.
*/
- if (state.ro != &iproute || state.ro->ro_rt != NULL) {
+ if (ipsec_state.tunneled) {
flags &= ~IP_ROUTETOIF;
- ro = state.ro;
+ ro = (struct route *)&ipsec_state.ro;
}
- } else
- ro = state.ro;
- dst = (struct sockaddr_in *)state.dst;
+ } else {
+ ro = (struct route *)&ipsec_state.ro;
+ }
+ dst = SIN(ipsec_state.dst);
if (error) {
/* mbuf is already reclaimed in ipsec4_output. */
m0 = NULL;
break;
default:
printf("ip4_output (ipsec): error code %d\n", error);
- /*fall through*/
+ /* FALLTHRU */
case ENOENT:
/* don't show these error codes to the user */
error = 0;
break;
}
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 4, 0, 0, 0, 0);
goto bad;
}
- }
+ }
/* be sure to update variables that are affected by ipsec4_output() */
ip = mtod(m, struct ip *);
+
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
-#else
+#else /* !_IP_VHL */
hlen = ip->ip_hl << 2;
-#endif
+#endif /* !_IP_VHL */
+ /* Check that there wasn't a route change and src is still valid */
+ if (ROUTE_UNUSABLE(ro)) {
+ ROUTE_RELEASE(ro);
+ VERIFY(src_ia == NULL);
+ if (ip->ip_src.s_addr != INADDR_ANY &&
+ !(flags & (IP_ROUTETOIF | IP_FORWARDING)) &&
+ (src_ia = ifa_foraddr(ip->ip_src.s_addr)) == NULL) {
+ error = EADDRNOTAVAIL;
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 5, 0, 0, 0, 0);
+ goto bad;
+ }
+ if (src_ia != NULL) {
+ IFA_REMREF(&src_ia->ia_ifa);
+ src_ia = NULL;
+ }
+ }
+
if (ro->ro_rt == NULL) {
- if ((flags & IP_ROUTETOIF) == 0) {
- printf("ip_output: "
- "can't update route after IPsec processing\n");
- error = EHOSTUNREACH; /*XXX*/
+ if (!(flags & IP_ROUTETOIF)) {
+ printf("%s: can't update route after "
+ "IPsec processing\n", __func__);
+ error = EHOSTUNREACH; /* XXX */
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 6, 0, 0, 0, 0);
goto bad;
}
} else {
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+ RT_LOCK_SPIN(ro->ro_rt);
ia = ifatoia(ro->ro_rt->rt_ifa);
+ if (ia != NULL) {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro->ro_rt);
+ IFA_ADDREF(&ia->ia_ifa);
+ }
ifp = ro->ro_rt->rt_ifp;
- dl_tag = ia->ia_ifa.ifa_dlt;
+ RT_UNLOCK(ro->ro_rt);
}
/* make it flipped, again. */
+#if BYTE_ORDER != BIG_ENDIAN
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);
-skip_ipsec:
-#endif /*IPSEC*/
+#endif
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 7, 0xff, 0xff, 0xff, 0xff);
- /*
- * IpHack's section.
- * - Xlate: translate packet's addr/port (NAT).
- * - Firewall: deny/allow/etc.
- * - Wrap: fake packet's addr/port <unimpl.>
- * - Encapsulate: put it in another IP and send out. <unimp.>
- */
- if (fr_checkp) {
- struct mbuf *m1 = m;
-
- if ((error = (*fr_checkp)(ip, hlen, ifp, 1, &m1)) || !m1)
- goto done;
- ip = mtod(m = m1, struct ip *);
+ /* Pass to filters again */
+ if (!TAILQ_EMPTY(&ipv4_filters)) {
+ struct ipfilter *filter;
+
+ ipf_pktopts.ippo_flags &= ~IPPOF_MCAST_OPTS;
+
+ /*
+ * Check that a TSO frame isn't passed to a filter.
+ * This could happen if a filter is inserted while
+ * TCP is sending the TSO packet.
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) {
+ error = EMSGSIZE;
+ goto bad;
+ }
+
+ ipf_ref();
+
+ /* 4135317 - always pass network byte order to filter */
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+ TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) {
+ if (filter->ipf_filter.ipf_output) {
+ errno_t result;
+ result = filter->ipf_filter.
+ ipf_output(filter->ipf_filter.cookie,
+ (mbuf_t *)&m, ippo);
+ if (result == EJUSTRETURN) {
+ ipf_unref();
+ goto done;
+ }
+ if (result != 0) {
+ ipf_unref();
+ goto bad;
+ }
+ }
+ }
+ /* set back to host byte order */
+ ip = mtod(m, struct ip *);
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_len);
+ NTOHS(ip->ip_off);
+#endif
+ ipf_unref();
}
+skip_ipsec:
+#endif /* IPSEC */
+#if IPFIREWALL
/*
* Check with the firewall...
+ * but not if we are already being fwd'd from a firewall.
*/
- if (fw_enable && ip_fw_chk_ptr) {
+ if (fw_enable && IPFW_LOADED && !args.fwa_next_hop) {
struct sockaddr_in *old = dst;
- off = (*ip_fw_chk_ptr)(&ip,
- hlen, ifp, &divert_cookie, &m, &rule, &dst);
- /*
- * On return we must do the following:
- * IP_FW_PORT_DENY_FLAG -> drop the pkt (XXX new)
- * 1<=off<= 0xffff -> DIVERT
- * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe
- * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet
- * dst != old -> IPFIREWALL_FORWARD
- * off==0, dst==old -> accept
- * If some of the above modules is not compiled in, then
- * we should't have to check the corresponding condition
- * (because the ipfw control socket should not accept
- * unsupported rules), but better play safe and drop
- * packets in case of doubt.
- */
- if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) {
+ args.fwa_m = m;
+ args.fwa_next_hop = dst;
+ args.fwa_oif = ifp;
+ ipfwoff = ip_fw_chk_ptr(&args);
+ m = args.fwa_m;
+ dst = args.fwa_next_hop;
+
+ /*
+ * On return we must do the following:
+ * IP_FW_PORT_DENY_FLAG -> drop the pkt (XXX new)
+ * 1<=off<= 0xffff -> DIVERT
+ * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe
+ * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet
+ * dst != old -> IPFIREWALL_FORWARD
+ * off==0, dst==old -> accept
+ * If some of the above modules is not compiled in, then
+ * we should't have to check the corresponding condition
+ * (because the ipfw control socket should not accept
+ * unsupported rules), but better play safe and drop
+ * packets in case of doubt.
+ */
+ m0 = m;
+ if ((ipfwoff & IP_FW_PORT_DENY_FLAG) || m == NULL) {
if (m)
m_freem(m);
- error = EACCES ;
- goto done ;
+ error = EACCES;
+ goto done;
}
ip = mtod(m, struct ip *);
- if (off == 0 && dst == old) /* common case */
- goto pass ;
+
+ if (ipfwoff == 0 && dst == old) { /* common case */
+ goto pass;
+ }
#if DUMMYNET
- if ((off & IP_FW_PORT_DYNT_FLAG) != 0) {
- /*
- * pass the pkt to dummynet. Need to include
- * pipe number, m, ifp, ro, dst because these are
- * not recomputed in the next pass.
- * All other parameters have been already used and
- * so they are not needed anymore.
- * XXX note: if the ifp or ro entry are deleted
- * while a pkt is in dummynet, we are in trouble!
- */
- error = dummynet_io(off & 0xffff, DN_TO_IP_OUT, m,
- ifp,ro,dst,rule, flags);
- goto done;
- }
-#endif
+ if (DUMMYNET_LOADED && (ipfwoff & IP_FW_PORT_DYNT_FLAG) != 0) {
+ /*
+ * pass the pkt to dummynet. Need to include
+ * pipe number, m, ifp, ro, dst because these are
+ * not recomputed in the next pass.
+ * All other parameters have been already used and
+ * so they are not needed anymore.
+ * XXX note: if the ifp or ro entry are deleted
+ * while a pkt is in dummynet, we are in trouble!
+ */
+ args.fwa_ro = ro;
+ args.fwa_dst = dst;
+ args.fwa_oflags = flags;
+ if (flags & IP_OUTARGS)
+ args.fwa_ipoa = ipoa;
+
+ error = ip_dn_io_ptr(m, ipfwoff & 0xffff, DN_TO_IP_OUT,
+ &args, DN_CLIENT_IPFW);
+ goto done;
+ }
+#endif /* DUMMYNET */
#if IPDIVERT
- if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) {
+ if (ipfwoff != 0 && (ipfwoff & IP_FW_PORT_DYNT_FLAG) == 0) {
struct mbuf *clone = NULL;
/* Clone packet if we're doing a 'tee' */
- if ((off & IP_FW_PORT_TEE_FLAG) != 0)
+ if ((ipfwoff & IP_FW_PORT_TEE_FLAG) != 0)
clone = m_dup(m, M_DONTWAIT);
/*
* XXX
* delayed checksums are not currently compatible
* with divert sockets.
*/
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
in_delayed_cksum(m);
- m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
- }
/* Restore packet header fields to original values */
+
+#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
+#endif
/* Deliver packet to divert input routine */
- ip_divert_cookie = divert_cookie;
- divert_packet(m, 0, off & 0xffff);
+ divert_packet(m, 0, ipfwoff & 0xffff,
+ args.fwa_divert_rule);
/* If 'tee', continue with original packet */
if (clone != NULL) {
- m = clone;
+ m0 = m = clone;
ip = mtod(m, struct ip *);
goto pass;
}
goto done;
}
-#endif
-
+#endif /* IPDIVERT */
#if IPFIREWALL_FORWARD
- /* Here we check dst to make sure it's directly reachable on the
- * interface we previously thought it was.
+ /*
+ * Here we check dst to make sure it's directly reachable on
+ * the interface we previously thought it was.
* If it isn't (which may be likely in some situations) we have
* to re-route it (ie, find a route for the next-hop and the
* associated interface) and set them here. This is nested
* such control is nigh impossible. So we do it here.
* And I'm babbling.
*/
- if (off == 0 && old != dst) {
- struct in_ifaddr *ia;
+ if (ipfwoff == 0 && old != dst) {
+ struct in_ifaddr *ia_fw;
+ struct route *ro_fwd = &sro_fwd;
- /* It's changed... */
- /* There must be a better way to do this next line... */
- static struct route sro_fwd, *ro_fwd = &sro_fwd;
#if IPFIREWALL_FORWARD_DEBUG
printf("IPFIREWALL_FORWARD: New dst ip: ");
print_ip(dst->sin_addr);
printf("\n");
-#endif
+#endif /* IPFIREWALL_FORWARD_DEBUG */
/*
* We need to figure out if we have been forwarded
- * to a local socket. If so then we should somehow
+ * to a local socket. If so then we should somehow
* "loop back" to ip_input, and get directed to the
* PCB as if we had received this packet. This is
* because it may be dificult to identify the packets
* you want to forward until they are being output
* and have selected an interface. (e.g. locally
* initiated packets) If we used the loopback inteface,
- * we would not be able to control what happens
+ * we would not be able to control what happens
* as the packet runs through ip_input() as
* it is done through a ISR.
*/
- TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
+ lck_rw_lock_shared(in_ifaddr_rwlock);
+ TAILQ_FOREACH(ia_fw, &in_ifaddrhead, ia_link) {
/*
* If the addr to forward to is one
* of ours, we pretend to
* be the destination for this packet.
*/
- if (IA_SIN(ia)->sin_addr.s_addr ==
- dst->sin_addr.s_addr)
+ IFA_LOCK_SPIN(&ia_fw->ia_ifa);
+ if (IA_SIN(ia_fw)->sin_addr.s_addr ==
+ dst->sin_addr.s_addr) {
+ IFA_UNLOCK(&ia_fw->ia_ifa);
break;
+ }
+ IFA_UNLOCK(&ia_fw->ia_ifa);
}
- if (ia) {
+ lck_rw_done(in_ifaddr_rwlock);
+ if (ia_fw) {
/* tell ip_input "dont filter" */
- ip_fw_fwd_addr = dst;
- if (m->m_pkthdr.rcvif == NULL)
- m->m_pkthdr.rcvif = ifunit("lo0");
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
- m->m_pkthdr.csum_flags |=
- CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
- m0->m_pkthdr.csum_data = 0xffff;
+ 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) {
+ error = ENOBUFS;
+ goto bad;
}
- m->m_pkthdr.csum_flags |=
- CSUM_IP_CHECKED | CSUM_IP_VALID;
+
+ ipfwd_tag = (struct ip_fwd_tag *)(fwd_tag+1);
+ ipfwd_tag->next_hop = args.fwa_next_hop;
+
+ m_tag_prepend(m, fwd_tag);
+
+ if (m->m_pkthdr.rcvif == NULL)
+ m->m_pkthdr.rcvif = lo_ifp;
+
+#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
- ip_input(m);
+#endif
+ mbuf_outbound_finalize(m, PF_INET, 0);
+
+ /*
+ * we need to call dlil_output to run filters
+ * and resync to avoid recursion loops.
+ */
+ if (lo_ifp) {
+ dlil_output(lo_ifp, PF_INET, m, NULL,
+ SA(dst), 0, adv);
+ } else {
+ printf("%s: no loopback ifp for "
+ "forwarding!!!\n", __func__);
+ }
goto done;
}
- /* Some of the logic for this was
- * nicked from above.
+ /*
+ * Some of the logic for this was nicked from above.
*
* This rewrites the cached route in a local PCB.
* Is this what we want to do?
*/
- bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
+ ROUTE_RELEASE(ro_fwd);
+ bcopy(dst, &ro_fwd->ro_dst, sizeof (*dst));
- ro_fwd->ro_rt = 0;
- rtalloc_ign(ro_fwd, RTF_PRCLONING);
+ rtalloc_ign(ro_fwd, RTF_PRCLONING, false);
- if (ro_fwd->ro_rt == 0) {
- ipstat.ips_noroute++;
+ if (ro_fwd->ro_rt == NULL) {
+ OSAddAtomic(1, &ipstat.ips_noroute);
error = EHOSTUNREACH;
goto bad;
}
- ia = ifatoia(ro_fwd->ro_rt->rt_ifa);
+ RT_LOCK_SPIN(ro_fwd->ro_rt);
+ ia_fw = ifatoia(ro_fwd->ro_rt->rt_ifa);
+ if (ia_fw != NULL) {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro_fwd->ro_rt);
+ IFA_ADDREF(&ia_fw->ia_ifa);
+ }
ifp = ro_fwd->ro_rt->rt_ifp;
- dl_tag = ro_fwd->ro_rt->rt_dlt;
ro_fwd->ro_rt->rt_use++;
if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY)
- dst = (struct sockaddr_in *)ro_fwd->ro_rt->rt_gateway;
- if (ro_fwd->ro_rt->rt_flags & RTF_HOST)
- isbroadcast =
- (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
- else
- isbroadcast = in_broadcast(dst->sin_addr, ifp);
- rtfree(ro->ro_rt);
+ dst = SIN(ro_fwd->ro_rt->rt_gateway);
+ if (ro_fwd->ro_rt->rt_flags & RTF_HOST) {
+ /* double negation needed for bool bit field */
+ ipobf.isbroadcast =
+ !!(ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
+ } else {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro_fwd->ro_rt);
+ ipobf.isbroadcast =
+ in_broadcast(dst->sin_addr, ifp);
+ }
+ RT_UNLOCK(ro_fwd->ro_rt);
+ ROUTE_RELEASE(ro);
ro->ro_rt = ro_fwd->ro_rt;
- dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
+ ro_fwd->ro_rt = NULL;
+ dst = SIN(&ro_fwd->ro_dst);
/*
* If we added a default src ip earlier,
* which would have been gotten from the-then
* interface, do it again, from the new one.
*/
- if (fwd_rewrite_src)
- ip->ip_src = IA_SIN(ia)->sin_addr;
- goto pass ;
+ if (ia_fw != NULL) {
+ if (ipobf.fwd_rewrite_src) {
+ IFA_LOCK_SPIN(&ia_fw->ia_ifa);
+ ip->ip_src = IA_SIN(ia_fw)->sin_addr;
+ IFA_UNLOCK(&ia_fw->ia_ifa);
+ }
+ IFA_REMREF(&ia_fw->ia_ifa);
+ }
+ goto pass;
}
#endif /* IPFIREWALL_FORWARD */
- /*
- * if we get here, none of the above matches, and
- * we have to drop the pkt
- */
+ /*
+ * if we get here, none of the above matches, and
+ * we have to drop the pkt
+ */
m_freem(m);
- error = EACCES; /* not sure this is the right error msg */
- goto done;
+ error = EACCES; /* not sure this is the right error msg */
+ goto done;
}
pass:
- m->m_pkthdr.csum_flags |= CSUM_IP;
- sw_csum = m->m_pkthdr.csum_flags & ~ifp->if_hwassist;
+#endif /* IPFIREWALL */
+
+ /* 127/8 must not appear on wire - RFC1122 */
+ if (!(ifp->if_flags & IFF_LOOPBACK) &&
+ ((ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
+ (ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)) {
+ OSAddAtomic(1, &ipstat.ips_badaddr);
+ error = EADDRNOTAVAIL;
+ goto bad;
+ }
- if ((ifp->if_hwassist & CSUM_TCP_SUM16) != 0) {
- /*
- * Special case code for GMACE
- * frames that can be checksumed by GMACE SUM16 HW:
- * frame >64, no fragments, no UDP
- */
- if (apple_hwcksum_tx && (m->m_pkthdr.csum_flags & CSUM_TCP)
- && (ip->ip_len > 50) && (ip->ip_len <= ifp->if_mtu)) {
- /* Apple GMAC HW, expects STUFF_OFFSET << 16 | START_OFFSET */
- u_short offset = (IP_VHL_HL(ip->ip_vhl) << 2) +14 ; /* IP+Enet header length */
- u_short csumprev= m->m_pkthdr.csum_data & 0xFFFF;
- m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_TCP_SUM16; /* for GMAC */
- m->m_pkthdr.csum_data = (csumprev + offset) << 16 ;
- m->m_pkthdr.csum_data += offset;
- sw_csum = CSUM_DELAY_IP; /* do IP hdr chksum in software */
- }
- else {
- /* let the software handle any UDP or TCP checksums */
- sw_csum |= (CSUM_DELAY_DATA & m->m_pkthdr.csum_flags);
+ if (ipoa != NULL) {
+ u_int8_t dscp = ip->ip_tos >> IPTOS_DSCP_SHIFT;
+
+ error = set_packet_qos(m, ifp,
+ ipoa->ipoa_flags & IPOAF_QOSMARKING_ALLOWED ? TRUE : FALSE,
+ ipoa->ipoa_sotc, ipoa->ipoa_netsvctype, &dscp);
+ if (error == 0) {
+ ip->ip_tos &= IPTOS_ECN_MASK;
+ ip->ip_tos |= dscp << IPTOS_DSCP_SHIFT;
+ } else {
+ printf("%s if_dscp_for_mbuf() error %d\n", __func__, error);
+ error = 0;
}
}
-
- if (sw_csum & CSUM_DELAY_DATA) {
- in_delayed_cksum(m);
- sw_csum &= ~CSUM_DELAY_DATA;
- m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+
+ /*
+ * Some Wi-Fi AP implementations do not correctly handle multicast IP
+ * packets with DSCP bits set -- see radr://9331522 -- so as a
+ * workaround we clear the DSCP bits and set the service class to BE
+ */
+ if (IN_MULTICAST(ntohl(pkt_dst.s_addr)) && IFNET_IS_WIFI_INFRA(ifp)) {
+ ip->ip_tos &= IPTOS_ECN_MASK;
+ mbuf_set_service_class(m, MBUF_SC_BE);
}
-
- m->m_pkthdr.csum_flags &= ifp->if_hwassist;
+
+ ip_output_checksum(ifp, m, (IP_VHL_HL(ip->ip_vhl) << 2),
+ ip->ip_len, &sw_csum);
/*
* If small enough for interface, or the interface will take
* care of the fragmentation for us, can just send directly.
*/
- if ((u_short)ip->ip_len <= ifp->if_mtu ||
- ifp->if_hwassist & CSUM_FRAGMENT) {
+ if ((u_short)ip->ip_len <= ifp->if_mtu || TSO_IPV4_OK(ifp, m) ||
+ (!(ip->ip_off & IP_DF) && (ifp->if_hwassist & CSUM_FRAGMENT))) {
+#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
+#endif
+
ip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
- ip->ip_sum = in_cksum(m, hlen);
- }
-
-#ifndef __APPLE__
- /* Record statistics for this interface address. */
- if (!(flags & IP_FORWARDING) && ia != NULL) {
- ia->ia_ifa.if_opackets++;
- ia->ia_ifa.if_obytes += m->m_pkthdr.len;
+ ip->ip_sum = ip_cksum_hdr_out(m, hlen);
+ sw_csum &= ~CSUM_DELAY_IP;
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IP;
}
-#endif
#if IPSEC
/* clean ipsec history once it goes out of the node */
- if (ipsec_bypass == 0)
+ if (ipsec_bypass == 0 && !(flags & IP_NOIPSEC))
ipsec_delaux(m);
-#endif
-#if __APPLE__
- error = dlil_output(dl_tag, m, (void *) ro->ro_rt,
- (struct sockaddr *)dst, 0);
-#else
- error = (*ifp->if_output)(ifp, m,
- (struct sockaddr *)dst, ro->ro_rt);
-#endif
- goto done;
+#endif /* IPSEC */
+ if ((m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) &&
+ (m->m_pkthdr.tso_segsz > 0))
+ scnt += m->m_pkthdr.len / m->m_pkthdr.tso_segsz;
+ else
+ scnt++;
+
+ if (packetchain == 0) {
+ if (ro->ro_rt != NULL && nstat_collect)
+ nstat_route_tx(ro->ro_rt, scnt,
+ m->m_pkthdr.len, 0);
+
+ error = dlil_output(ifp, PF_INET, m, ro->ro_rt,
+ SA(dst), 0, adv);
+ if (dlil_verbose && error) {
+ printf("dlil_output error on interface %s: %d\n",
+ ifp->if_xname, error);
+ }
+ scnt = 0;
+ goto done;
+ } else {
+ /*
+ * packet chaining allows us to reuse the
+ * route for all packets
+ */
+ bytecnt += m->m_pkthdr.len;
+ mppn = &m->m_nextpkt;
+ m = m->m_nextpkt;
+ if (m == NULL) {
+#if PF
+sendchain:
+#endif /* PF */
+ if (pktcnt > ip_maxchainsent)
+ ip_maxchainsent = pktcnt;
+ if (ro->ro_rt != NULL && nstat_collect)
+ nstat_route_tx(ro->ro_rt, scnt,
+ bytecnt, 0);
+
+ error = dlil_output(ifp, PF_INET, packetlist,
+ ro->ro_rt, SA(dst), 0, adv);
+ if (dlil_verbose && error) {
+ printf("dlil_output error on interface %s: %d\n",
+ ifp->if_xname, error);
+ }
+ pktcnt = 0;
+ scnt = 0;
+ bytecnt = 0;
+ goto done;
+
+ }
+ m0 = m;
+ pktcnt++;
+ goto loopit;
+ }
}
/*
* Too large for interface; fragment if possible.
* Must be able to put at least 8 bytes per fragment.
+ * Balk when DF bit is set or the interface didn't support TSO.
*/
- if (ip->ip_off & IP_DF) {
+ if ((ip->ip_off & IP_DF) || pktcnt > 0 ||
+ (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4)) {
error = EMSGSIZE;
/*
* This case can happen if the user changed the MTU
* them, there is no way for one to update all its
* routes when the MTU is changed.
*/
- if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST))
- && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU)
- && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
- ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
+ if (ro->ro_rt) {
+ RT_LOCK_SPIN(ro->ro_rt);
+ if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) &&
+ !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) &&
+ (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) {
+ ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu;
+ }
+ RT_UNLOCK(ro->ro_rt);
}
- ipstat.ips_cantfrag++;
+ if (pktcnt > 0) {
+ m0 = packetlist;
+ }
+ OSAddAtomic(1, &ipstat.ips_cantfrag);
goto bad;
}
- len = (ifp->if_mtu - hlen) &~ 7;
- if (len < 8) {
- error = EMSGSIZE;
+
+ error = ip_fragment(m, ifp, ifp->if_mtu, sw_csum);
+ if (error != 0) {
+ m0 = m = NULL;
goto bad;
}
+ KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr,
+ ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
+
+ for (m = m0; m; m = m0) {
+ m0 = m->m_nextpkt;
+ m->m_nextpkt = 0;
+#if IPSEC
+ /* clean ipsec history once it goes out of the node */
+ if (ipsec_bypass == 0 && !(flags & IP_NOIPSEC))
+ ipsec_delaux(m);
+#endif /* IPSEC */
+ if (error == 0) {
+ if ((packetchain != 0) && (pktcnt > 0)) {
+ panic("%s: mix of packet in packetlist is "
+ "wrong=%p", __func__, packetlist);
+ /* NOTREACHED */
+ }
+ if (ro->ro_rt != NULL && nstat_collect) {
+ nstat_route_tx(ro->ro_rt, 1,
+ m->m_pkthdr.len, 0);
+ }
+ error = dlil_output(ifp, PF_INET, m, ro->ro_rt,
+ SA(dst), 0, adv);
+ if (dlil_verbose && error) {
+ printf("dlil_output error on interface %s: %d\n",
+ ifp->if_xname, error);
+ }
+ } else {
+ m_freem(m);
+ }
+ }
+
+ if (error == 0)
+ OSAddAtomic(1, &ipstat.ips_fragmented);
+
+done:
+ if (ia != NULL) {
+ IFA_REMREF(&ia->ia_ifa);
+ ia = NULL;
+ }
+#if IPSEC
+ ROUTE_RELEASE(&ipsec_state.ro);
+ if (sp != NULL) {
+ KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
+ printf("DP ip_output call free SP:%x\n", sp));
+ key_freesp(sp, KEY_SADB_UNLOCKED);
+ }
+#endif /* IPSEC */
+#if NECP
+ ROUTE_RELEASE(&necp_route);
+#endif /* NECP */
+#if DUMMYNET
+ ROUTE_RELEASE(&saved_route);
+#endif /* DUMMYNET */
+#if IPFIREWALL_FORWARD
+ ROUTE_RELEASE(&sro_fwd);
+#endif /* IPFIREWALL_FORWARD */
+
+ KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error, 0, 0, 0, 0);
+ if (ip_output_measure) {
+ net_perf_measure_time(&net_perf, &start_tv, packets_processed);
+ net_perf_histogram(&net_perf, packets_processed);
+ }
+ return (error);
+bad:
+ if (pktcnt > 0)
+ m0 = packetlist;
+ m_freem_list(m0);
+ goto done;
+
+#undef ipsec_state
+#undef args
+#undef sro_fwd
+#undef saved_route
+#undef ipf_pktopts
+#undef IP_CHECK_RESTRICTIONS
+}
+
+int
+ip_fragment(struct mbuf *m, struct ifnet *ifp, unsigned long mtu, int sw_csum)
+{
+ struct ip *ip, *mhip;
+ int len, hlen, mhlen, firstlen, off, error = 0;
+ struct mbuf **mnext = &m->m_nextpkt, *m0;
+ int nfrags = 1;
+
+ ip = mtod(m, struct ip *);
+#ifdef _IP_VHL
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+#else /* !_IP_VHL */
+ hlen = ip->ip_hl << 2;
+#endif /* !_IP_VHL */
+
+ firstlen = len = (mtu - hlen) &~ 7;
+ if (len < 8) {
+ m_freem(m);
+ return (EMSGSIZE);
+ }
+
/*
* if the interface will not calculate checksums on
* fragmented packets, then do it here.
*/
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA &&
- (ifp->if_hwassist & CSUM_IP_FRAGS) == 0) {
+ if ((m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) &&
+ !(ifp->if_hwassist & CSUM_IP_FRAGS))
in_delayed_cksum(m);
- if (m == NULL)
- return(ENOMEM);
- m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
- }
-
-
- {
- int mhlen, firstlen = len;
- struct mbuf **mnext = &m->m_nextpkt;
- int nfrags = 1;
/*
* Loop through length of segment after first fragment,
m0 = m;
mhlen = sizeof (struct ip);
for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
- MGETHDR(m, M_DONTWAIT, MT_HEADER);
- if (m == 0) {
+ MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
+ if (m == NULL) {
error = ENOBUFS;
- ipstat.ips_odropped++;
+ OSAddAtomic(1, &ipstat.ips_odropped);
goto sendorfree;
}
m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
mhip->ip_off |= IP_MF;
mhip->ip_len = htons((u_short)(len + mhlen));
m->m_next = m_copy(m0, off, len);
- if (m->m_next == 0) {
+ if (m->m_next == NULL) {
(void) m_free(m);
error = ENOBUFS; /* ??? */
- ipstat.ips_odropped++;
+ OSAddAtomic(1, &ipstat.ips_odropped);
goto sendorfree;
}
m->m_pkthdr.len = mhlen + len;
- m->m_pkthdr.rcvif = (struct ifnet *)0;
+ m->m_pkthdr.rcvif = NULL;
m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
+
+ M_COPY_CLASSIFIER(m, m0);
+ M_COPY_PFTAG(m, m0);
+
+#if CONFIG_MACF_NET
+ mac_netinet_fragment(m0, m);
+#endif /* CONFIG_MACF_NET */
+
+#if BYTE_ORDER != BIG_ENDIAN
HTONS(mhip->ip_off);
+#endif
+
mhip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
- mhip->ip_sum = in_cksum(m, mhlen);
+ mhip->ip_sum = ip_cksum_hdr_out(m, mhlen);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IP;
}
*mnext = m;
mnext = &m->m_nextpkt;
nfrags++;
}
- ipstat.ips_ofragments += nfrags;
+ OSAddAtomic(nfrags, &ipstat.ips_ofragments);
/* set first/last markers for fragment chain */
m->m_flags |= M_LASTFRAG;
m->m_pkthdr.len = hlen + firstlen;
ip->ip_len = htons((u_short)m->m_pkthdr.len);
ip->ip_off |= IP_MF;
+
+#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_off);
- ip->ip_sum = 0;
+#endif
+
+ ip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
- ip->ip_sum = in_cksum(m, hlen);
+ ip->ip_sum = ip_cksum_hdr_out(m, hlen);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IP;
}
sendorfree:
+ if (error)
+ m_freem_list(m0);
- KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr,
- ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len);
+ return (error);
+}
- for (m = m0; m; m = m0) {
- m0 = m->m_nextpkt;
- m->m_nextpkt = 0;
-#if IPSEC
- /* clean ipsec history once it goes out of the node */
- if (ipsec_bypass == 0)
- ipsec_delaux(m);
-#endif
- if (error == 0) {
-#ifndef __APPLE__
- /* Record statistics for this interface address. */
- if (ia != NULL) {
- ia->ia_ifa.if_opackets++;
- ia->ia_ifa.if_obytes += m->m_pkthdr.len;
- }
-#endif
-
-#if __APPLE__
- error = dlil_output(dl_tag, m, (void *) ro->ro_rt,
- (struct sockaddr *)dst, 0);
-#else
- error = (*ifp->if_output)(ifp, m,
- (struct sockaddr *)dst, ro->ro_rt);
-#endif
- } else
- m_freem(m);
+static void
+ip_out_cksum_stats(int proto, u_int32_t len)
+{
+ switch (proto) {
+ case IPPROTO_TCP:
+ tcp_out_cksum_stats(len);
+ break;
+ case IPPROTO_UDP:
+ udp_out_cksum_stats(len);
+ break;
+ default:
+ /* keep only TCP or UDP stats for now */
+ break;
}
+}
- if (error == 0)
- ipstat.ips_fragmented++;
- }
-done:
-#if IPSEC
- if (ipsec_bypass == 0) {
- if (ro == &iproute && ro->ro_rt) {
- rtfree(ro->ro_rt);
- ro->ro_rt = NULL;
+/*
+ * Process a delayed payload checksum calculation (outbound path.)
+ *
+ * hoff is the number of bytes beyond the mbuf data pointer which
+ * points to the IP header.
+ *
+ * Returns a bitmask representing all the work done in software.
+ */
+uint32_t
+in_finalize_cksum(struct mbuf *m, uint32_t hoff, uint32_t csum_flags)
+{
+ unsigned char buf[15 << 2] __attribute__((aligned(8)));
+ struct ip *ip;
+ uint32_t offset, _hlen, mlen, hlen, len, sw_csum;
+ uint16_t csum, ip_len;
+
+ _CASSERT(sizeof (csum) == sizeof (uint16_t));
+ VERIFY(m->m_flags & M_PKTHDR);
+
+ sw_csum = (csum_flags & m->m_pkthdr.csum_flags);
+
+ if ((sw_csum &= (CSUM_DELAY_IP | CSUM_DELAY_DATA)) == 0)
+ goto done;
+
+ mlen = m->m_pkthdr.len; /* total mbuf len */
+
+ /* sanity check (need at least simple IP header) */
+ if (mlen < (hoff + sizeof (*ip))) {
+ panic("%s: mbuf %p pkt len (%u) < hoff+ip_hdr "
+ "(%u+%u)\n", __func__, m, mlen, hoff,
+ (uint32_t)sizeof (*ip));
+ /* NOTREACHED */
}
- if (sp != NULL) {
- KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ip_output call free SP:%x\n", sp));
- key_freesp(sp);
+
+ /*
+ * In case the IP header is not contiguous, or not 32-bit aligned,
+ * or if we're computing the IP header checksum, copy it to a local
+ * buffer. Copy only the simple IP header here (IP options case
+ * is handled below.)
+ */
+ if ((sw_csum & CSUM_DELAY_IP) || (hoff + sizeof (*ip)) > m->m_len ||
+ !IP_HDR_ALIGNED_P(mtod(m, caddr_t) + hoff)) {
+ m_copydata(m, hoff, sizeof (*ip), (caddr_t)buf);
+ ip = (struct ip *)(void *)buf;
+ _hlen = sizeof (*ip);
+ } else {
+ ip = (struct ip *)(void *)(m->m_data + hoff);
+ _hlen = 0;
}
+
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2; /* IP header len */
+
+ /* sanity check */
+ if (mlen < (hoff + hlen)) {
+ panic("%s: mbuf %p pkt too short (%d) for IP header (%u), "
+ "hoff %u", __func__, m, mlen, hlen, hoff);
+ /* NOTREACHED */
}
-#endif /* IPSEC */
- KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error,0,0,0,0);
- return (error);
-bad:
- m_freem(m0);
- goto done;
-}
+ /*
+ * We could be in the context of an IP or interface filter; in the
+ * former case, ip_len would be in host (correct) order while for
+ * the latter it would be in network order. Because of this, we
+ * attempt to interpret the length field by comparing it against
+ * the actual packet length. If the comparison fails, byte swap
+ * the length and check again. If it still fails, use the actual
+ * packet length. This also covers the trailing bytes case.
+ */
+ ip_len = ip->ip_len;
+ if (ip_len != (mlen - hoff)) {
+ ip_len = OSSwapInt16(ip_len);
+ if (ip_len != (mlen - hoff)) {
+ printf("%s: mbuf 0x%llx proto %d IP len %d (%x) "
+ "[swapped %d (%x)] doesn't match actual packet "
+ "length; %d is used instead\n", __func__,
+ (uint64_t)VM_KERNEL_ADDRPERM(m), ip->ip_p,
+ ip->ip_len, ip->ip_len, ip_len, ip_len,
+ (mlen - hoff));
+ ip_len = mlen - hoff;
+ }
+ }
-void
-in_delayed_cksum(struct mbuf *m)
-{
- struct ip *ip;
- u_short csum, offset;
- ip = mtod(m, struct ip *);
- offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
- csum = in_cksum_skip(m, ip->ip_len, offset);
- if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
- csum = 0xffff;
- offset += m->m_pkthdr.csum_data & 0xFFFF; /* checksum offset */
+ len = ip_len - hlen; /* csum span */
- if (offset > ip->ip_len) /* bogus offset */
- return;
+ if (sw_csum & CSUM_DELAY_DATA) {
+ uint16_t ulpoff;
+
+ /*
+ * offset is added to the lower 16-bit value of csum_data,
+ * which is expected to contain the ULP offset; therefore
+ * CSUM_PARTIAL offset adjustment must be undone.
+ */
+ if ((m->m_pkthdr.csum_flags & (CSUM_PARTIAL|CSUM_DATA_VALID)) ==
+ (CSUM_PARTIAL|CSUM_DATA_VALID)) {
+ /*
+ * Get back the original ULP offset (this will
+ * undo the CSUM_PARTIAL logic in ip_output.)
+ */
+ m->m_pkthdr.csum_data = (m->m_pkthdr.csum_tx_stuff -
+ m->m_pkthdr.csum_tx_start);
+ }
+
+ ulpoff = (m->m_pkthdr.csum_data & 0xffff); /* ULP csum offset */
+ offset = hoff + hlen; /* ULP header */
+
+ if (mlen < (ulpoff + sizeof (csum))) {
+ panic("%s: mbuf %p pkt len (%u) proto %d invalid ULP "
+ "cksum offset (%u) cksum flags 0x%x\n", __func__,
+ m, mlen, ip->ip_p, ulpoff, m->m_pkthdr.csum_flags);
+ /* NOTREACHED */
+ }
+
+ csum = inet_cksum(m, 0, offset, len);
+
+ /* Update stats */
+ ip_out_cksum_stats(ip->ip_p, len);
+
+ /* RFC1122 4.1.3.4 */
+ if (csum == 0 &&
+ (m->m_pkthdr.csum_flags & (CSUM_UDP|CSUM_ZERO_INVERT)))
+ csum = 0xffff;
+
+ /* Insert the checksum in the ULP csum field */
+ offset += ulpoff;
+ if (offset + sizeof (csum) > m->m_len) {
+ m_copyback(m, offset, sizeof (csum), &csum);
+ } else if (IP_HDR_ALIGNED_P(mtod(m, char *) + hoff)) {
+ *(uint16_t *)(void *)(mtod(m, char *) + offset) = csum;
+ } else {
+ bcopy(&csum, (mtod(m, char *) + offset), sizeof (csum));
+ }
+ m->m_pkthdr.csum_flags &= ~(CSUM_DELAY_DATA | CSUM_DATA_VALID |
+ CSUM_PARTIAL | CSUM_ZERO_INVERT);
+ }
+
+ if (sw_csum & CSUM_DELAY_IP) {
+ /* IP header must be in the local buffer */
+ VERIFY(_hlen == sizeof (*ip));
+ if (_hlen != hlen) {
+ VERIFY(hlen <= sizeof (buf));
+ m_copydata(m, hoff, hlen, (caddr_t)buf);
+ ip = (struct ip *)(void *)buf;
+ _hlen = hlen;
+ }
- if (offset + sizeof(u_short) > m->m_len) {
- printf("delayed m_pullup, m->len: %d off: %d p: %d\n",
- m->m_len, offset, ip->ip_p);
/*
- * XXX
- * this shouldn't happen, but if it does, the
- * correct behavior may be to insert the checksum
- * in the existing chain instead of rearranging it.
+ * Compute the IP header checksum as if the IP length
+ * is the length which we believe is "correct"; see
+ * how ip_len gets calculated above. Note that this
+ * is done on the local copy and not on the real one.
*/
- m = m_pullup(m, offset + sizeof(u_short));
+ ip->ip_len = htons(ip_len);
+ ip->ip_sum = 0;
+ csum = in_cksum_hdr_opt(ip);
+
+ /* Update stats */
+ ipstat.ips_snd_swcsum++;
+ ipstat.ips_snd_swcsum_bytes += hlen;
+
+ /*
+ * Insert only the checksum in the existing IP header
+ * csum field; all other fields are left unchanged.
+ */
+ offset = hoff + offsetof(struct ip, ip_sum);
+ if (offset + sizeof (csum) > m->m_len) {
+ m_copyback(m, offset, sizeof (csum), &csum);
+ } else if (IP_HDR_ALIGNED_P(mtod(m, char *) + hoff)) {
+ *(uint16_t *)(void *)(mtod(m, char *) + offset) = csum;
+ } else {
+ bcopy(&csum, (mtod(m, char *) + offset), sizeof (csum));
+ }
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IP;
}
- *(u_short *)(m->m_data + offset) = csum;
+
+done:
+ return (sw_csum);
}
/*
* XXX This routine assumes that the packet has no options in place.
*/
static struct mbuf *
-ip_insertoptions(m, opt, phlen)
- register struct mbuf *m;
- struct mbuf *opt;
- int *phlen;
+ip_insertoptions(struct mbuf *m, struct mbuf *opt, int *phlen)
{
- register struct ipoption *p = mtod(opt, struct ipoption *);
+ struct ipoption *p = mtod(opt, struct ipoption *);
struct mbuf *n;
- register struct ip *ip = mtod(m, struct ip *);
+ struct ip *ip = mtod(m, struct ip *);
unsigned optlen;
- optlen = opt->m_len - sizeof(p->ipopt_dst);
+ optlen = opt->m_len - sizeof (p->ipopt_dst);
if (optlen + (u_short)ip->ip_len > IP_MAXPACKET)
return (m); /* XXX should fail */
if (p->ipopt_dst.s_addr)
ip->ip_dst = p->ipopt_dst;
if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) {
- MGETHDR(n, M_DONTWAIT, MT_HEADER);
- if (n == 0)
+ MGETHDR(n, M_DONTWAIT, MT_HEADER); /* MAC-OK */
+ if (n == NULL)
return (m);
- n->m_pkthdr.rcvif = (struct ifnet *)0;
+ n->m_pkthdr.rcvif = 0;
+#if CONFIG_MACF_NET
+ mac_mbuf_label_copy(m, n);
+#endif /* CONFIG_MACF_NET */
n->m_pkthdr.len = m->m_pkthdr.len + optlen;
- m->m_len -= sizeof(struct ip);
- m->m_data += sizeof(struct ip);
+ m->m_len -= sizeof (struct ip);
+ m->m_data += sizeof (struct ip);
n->m_next = m;
m = n;
- m->m_len = optlen + sizeof(struct ip);
+ m->m_len = optlen + sizeof (struct ip);
m->m_data += max_linkhdr;
- (void)memcpy(mtod(m, void *), ip, sizeof(struct ip));
+ (void) memcpy(mtod(m, void *), ip, sizeof (struct ip));
} else {
m->m_data -= optlen;
m->m_len += optlen;
m->m_pkthdr.len += optlen;
- ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
+ ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof (struct ip));
}
ip = mtod(m, struct ip *);
bcopy(p->ipopt_list, ip + 1, optlen);
- *phlen = sizeof(struct ip) + optlen;
+ *phlen = sizeof (struct ip) + optlen;
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
ip->ip_len += optlen;
return (m);
* Copy options from ip to jp,
* omitting those not copied during fragmentation.
*/
-int
-ip_optcopy(ip, jp)
- struct ip *ip, *jp;
+static int
+ip_optcopy(struct ip *ip, struct ip *jp)
{
- register u_char *cp, *dp;
+ u_char *cp, *dp;
int opt, optlen, cnt;
cp = (u_char *)(ip + 1);
continue;
}
#if DIAGNOSTIC
- if (cnt < IPOPT_OLEN + sizeof(*cp))
+ if (cnt < IPOPT_OLEN + sizeof (*cp)) {
panic("malformed IPv4 option passed to ip_optcopy");
+ /* NOTREACHED */
+ }
#endif
optlen = cp[IPOPT_OLEN];
#if DIAGNOSTIC
- if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
+ if (optlen < IPOPT_OLEN + sizeof (*cp) || optlen > cnt) {
panic("malformed IPv4 option passed to ip_optcopy");
+ /* NOTREACHED */
+ }
#endif
/* bogus lengths should have been caught by ip_dooptions */
if (optlen > cnt)
* IP socket option processing.
*/
int
-ip_ctloutput(so, sopt)
- struct socket *so;
- struct sockopt *sopt;
+ip_ctloutput(struct socket *so, struct sockopt *sopt)
{
struct inpcb *inp = sotoinpcb(so);
int error, optval;
error = optval = 0;
- if (sopt->sopt_level != IPPROTO_IP) {
+ if (sopt->sopt_level != IPPROTO_IP)
return (EINVAL);
- }
switch (sopt->sopt_dir) {
case SOPT_SET:
switch (sopt->sopt_name) {
- case IP_OPTIONS:
#ifdef notyet
case IP_RETOPTS:
#endif
- {
+ case IP_OPTIONS: {
struct mbuf *m;
+
if (sopt->sopt_valsize > MLEN) {
error = EMSGSIZE;
break;
}
- MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER);
- if (m == 0) {
+ MGET(m, sopt->sopt_p != kernproc ? M_WAIT : M_DONTWAIT,
+ MT_HEADER);
+ if (m == NULL) {
error = ENOBUFS;
break;
}
m->m_len = sopt->sopt_valsize;
- error = sooptcopyin(sopt, mtod(m, char *), m->m_len,
- m->m_len);
- if (error)
+ error = sooptcopyin(sopt, mtod(m, char *),
+ m->m_len, m->m_len);
+ if (error) {
+ m_freem(m);
break;
-
- return (ip_pcbopts(sopt->sopt_name, &inp->inp_options,
- m));
+ }
+
+ return (ip_pcbopts(sopt->sopt_name,
+ &inp->inp_options, m));
}
case IP_TOS:
case IP_RECVRETOPTS:
case IP_RECVDSTADDR:
case IP_RECVIF:
-#if defined(NFAITH) && NFAITH > 0
- case IP_FAITH:
-#endif
- error = sooptcopyin(sopt, &optval, sizeof optval,
- sizeof optval);
+ case IP_RECVTTL:
+ case IP_RECVPKTINFO:
+ case IP_RECVTOS:
+ error = sooptcopyin(sopt, &optval, sizeof (optval),
+ sizeof (optval));
if (error)
break;
OPTSET(INP_RECVIF);
break;
-#if defined(NFAITH) && NFAITH > 0
- case IP_FAITH:
- OPTSET(INP_FAITH);
+ case IP_RECVTTL:
+ OPTSET(INP_RECVTTL);
break;
-#endif
+
+ case IP_RECVPKTINFO:
+ OPTSET(INP_PKTINFO);
+ break;
+
+ case IP_RECVTOS:
+ OPTSET(INP_RECVTOS);
+ break;
+ #undef OPTSET
}
break;
-#undef OPTSET
-
+ /*
+ * Multicast socket options are processed by the in_mcast
+ * module.
+ */
case IP_MULTICAST_IF:
+ case IP_MULTICAST_IFINDEX:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
case IP_MULTICAST_LOOP:
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
- error = ip_setmoptions(sopt, &inp->inp_moptions);
+ case IP_ADD_SOURCE_MEMBERSHIP:
+ case IP_DROP_SOURCE_MEMBERSHIP:
+ case IP_BLOCK_SOURCE:
+ case IP_UNBLOCK_SOURCE:
+ case IP_MSFILTER:
+ case MCAST_JOIN_GROUP:
+ case MCAST_LEAVE_GROUP:
+ case MCAST_JOIN_SOURCE_GROUP:
+ case MCAST_LEAVE_SOURCE_GROUP:
+ case MCAST_BLOCK_SOURCE:
+ case MCAST_UNBLOCK_SOURCE:
+ error = inp_setmoptions(inp, sopt);
break;
case IP_PORTRANGE:
- error = sooptcopyin(sopt, &optval, sizeof optval,
- sizeof optval);
+ error = sooptcopyin(sopt, &optval, sizeof (optval),
+ sizeof (optval));
if (error)
break;
break;
#if IPSEC
- case IP_IPSEC_POLICY:
- {
+ case IP_IPSEC_POLICY: {
caddr_t req = NULL;
size_t len = 0;
int priv;
break;
if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */
break;
- priv = (sopt->sopt_p != NULL &&
- suser(sopt->sopt_p->p_ucred,
- &sopt->sopt_p->p_acflag) != 0) ? 0 : 1;
+ priv = (proc_suser(sopt->sopt_p) == 0);
if (m) {
req = mtod(m, caddr_t);
len = m->m_len;
m_freem(m);
break;
}
-#endif /*IPSEC*/
+#endif /* IPSEC */
+
+#if TRAFFIC_MGT
+ case IP_TRAFFIC_MGT_BACKGROUND: {
+ unsigned background = 0;
+
+ error = sooptcopyin(sopt, &background,
+ sizeof (background), sizeof (background));
+ if (error)
+ break;
+
+ if (background) {
+ socket_set_traffic_mgt_flags_locked(so,
+ TRAFFIC_MGT_SO_BACKGROUND);
+ } else {
+ socket_clear_traffic_mgt_flags_locked(so,
+ TRAFFIC_MGT_SO_BACKGROUND);
+ }
+
+ break;
+ }
+#endif /* TRAFFIC_MGT */
+
+ /*
+ * On a multihomed system, scoped routing can be used to
+ * restrict the source interface used for sending packets.
+ * The socket option IP_BOUND_IF binds a particular AF_INET
+ * socket to an interface such that data sent on the socket
+ * is restricted to that interface. This is unlike the
+ * SO_DONTROUTE option where the routing table is bypassed;
+ * therefore it allows for a greater flexibility and control
+ * over the system behavior, and does not place any restriction
+ * on the destination address type (e.g. unicast, multicast,
+ * or broadcast if applicable) or whether or not the host is
+ * directly reachable. Note that in the multicast transmit
+ * case, IP_MULTICAST_{IF,IFINDEX} takes precedence over
+ * IP_BOUND_IF, since the former practically bypasses the
+ * routing table; in this case, IP_BOUND_IF sets the default
+ * interface used for sending multicast packets in the absence
+ * of an explicit multicast transmit interface.
+ */
+ case IP_BOUND_IF:
+ /* This option is settable only for IPv4 */
+ if (!(inp->inp_vflag & INP_IPV4)) {
+ error = EINVAL;
+ break;
+ }
+
+ error = sooptcopyin(sopt, &optval, sizeof (optval),
+ sizeof (optval));
+
+ if (error)
+ break;
+
+ error = inp_bindif(inp, optval, NULL);
+ break;
+
+ case IP_NO_IFT_CELLULAR:
+ /* This option is settable only for IPv4 */
+ if (!(inp->inp_vflag & INP_IPV4)) {
+ error = EINVAL;
+ break;
+ }
+
+ error = sooptcopyin(sopt, &optval, sizeof (optval),
+ sizeof (optval));
+
+ if (error)
+ break;
+
+ /* once set, it cannot be unset */
+ if (!optval && INP_NO_CELLULAR(inp)) {
+ error = EINVAL;
+ break;
+ }
+
+ error = so_set_restrictions(so,
+ SO_RESTRICT_DENY_CELLULAR);
+ break;
+
+ case IP_OUT_IF:
+ /* This option is not settable */
+ error = EINVAL;
+ break;
default:
error = ENOPROTOOPT;
switch (sopt->sopt_name) {
case IP_OPTIONS:
case IP_RETOPTS:
- if (inp->inp_options)
- error = sooptcopyout(sopt,
- mtod(inp->inp_options,
- char *),
- inp->inp_options->m_len);
- else
+ if (inp->inp_options) {
+ error = sooptcopyout(sopt,
+ mtod(inp->inp_options, char *),
+ inp->inp_options->m_len);
+ } else {
sopt->sopt_valsize = 0;
+ }
break;
case IP_TOS:
case IP_RECVRETOPTS:
case IP_RECVDSTADDR:
case IP_RECVIF:
+ case IP_RECVTTL:
case IP_PORTRANGE:
-#if defined(NFAITH) && NFAITH > 0
- case IP_FAITH:
-#endif
+ case IP_RECVPKTINFO:
+ case IP_RECVTOS:
switch (sopt->sopt_name) {
-
case IP_TOS:
optval = inp->inp_ip_tos;
break;
optval = OPTBIT(INP_RECVIF);
break;
+ case IP_RECVTTL:
+ optval = OPTBIT(INP_RECVTTL);
+ break;
+
case IP_PORTRANGE:
if (inp->inp_flags & INP_HIGHPORT)
optval = IP_PORTRANGE_HIGH;
optval = 0;
break;
-#if defined(NFAITH) && NFAITH > 0
- case IP_FAITH:
- optval = OPTBIT(INP_FAITH);
+ case IP_RECVPKTINFO:
+ optval = OPTBIT(INP_PKTINFO);
+ break;
+
+ case IP_RECVTOS:
+ optval = OPTBIT(INP_RECVTOS);
break;
-#endif
}
- error = sooptcopyout(sopt, &optval, sizeof optval);
+ error = sooptcopyout(sopt, &optval, sizeof (optval));
break;
case IP_MULTICAST_IF:
+ case IP_MULTICAST_IFINDEX:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
case IP_MULTICAST_LOOP:
- case IP_ADD_MEMBERSHIP:
- case IP_DROP_MEMBERSHIP:
- error = ip_getmoptions(sopt, inp->inp_moptions);
+ case IP_MSFILTER:
+ error = inp_getmoptions(inp, sopt);
break;
#if IPSEC
- case IP_IPSEC_POLICY:
- {
- struct mbuf *m = NULL;
- caddr_t req = NULL;
- size_t len = 0;
-
- if (m != 0) {
- req = mtod(m, caddr_t);
- len = m->m_len;
- }
- error = ipsec4_get_policy(sotoinpcb(so), req, len, &m);
- if (error == 0)
- error = soopt_mcopyout(sopt, m); /* XXX */
- if (error == 0)
- m_freem(m);
+ case IP_IPSEC_POLICY: {
+ error = 0; /* This option is no longer supported */
break;
}
-#endif /*IPSEC*/
+#endif /* IPSEC */
+
+#if TRAFFIC_MGT
+ case IP_TRAFFIC_MGT_BACKGROUND: {
+ unsigned background = (so->so_flags1 &
+ SOF1_TRAFFIC_MGT_SO_BACKGROUND) ? 1 : 0;
+ return (sooptcopyout(sopt, &background,
+ sizeof (background)));
+ }
+#endif /* TRAFFIC_MGT */
+
+ case IP_BOUND_IF:
+ if (inp->inp_flags & INP_BOUND_IF)
+ optval = inp->inp_boundifp->if_index;
+ error = sooptcopyout(sopt, &optval, sizeof (optval));
+ break;
+
+ case IP_NO_IFT_CELLULAR:
+ optval = INP_NO_CELLULAR(inp) ? 1 : 0;
+ error = sooptcopyout(sopt, &optval, sizeof (optval));
+ break;
+
+ case IP_OUT_IF:
+ optval = (inp->inp_last_outifp != NULL) ?
+ inp->inp_last_outifp->if_index : 0;
+ error = sooptcopyout(sopt, &optval, sizeof (optval));
+ break;
default:
error = ENOPROTOOPT;
* with destination address if source routed.
*/
static int
-ip_pcbopts(optname, pcbopt, m)
- int optname;
- struct mbuf **pcbopt;
- register struct mbuf *m;
+ip_pcbopts(int optname, struct mbuf **pcbopt, struct mbuf *m)
{
- register int cnt, optlen;
- register u_char *cp;
+#pragma unused(optname)
+ int cnt, optlen;
+ u_char *cp;
u_char opt;
/* turn off any old options */
if (*pcbopt)
- (void)m_free(*pcbopt);
+ (void) m_free(*pcbopt);
*pcbopt = 0;
if (m == (struct mbuf *)0 || m->m_len == 0) {
/*
* Only turning off any previous options.
*/
if (m)
- (void)m_free(m);
+ (void) m_free(m);
return (0);
}
-#ifndef vax
- if (m->m_len % sizeof(int32_t))
+ if (m->m_len % sizeof (int32_t))
goto bad;
-#endif
+
/*
* IP first-hop destination address will be stored before
* actual options; move other options back
* and clear it when none present.
*/
- if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN])
+ if (m->m_data + m->m_len + sizeof (struct in_addr) >= &m->m_dat[MLEN])
goto bad;
cnt = m->m_len;
- m->m_len += sizeof(struct in_addr);
- cp = mtod(m, u_char *) + sizeof(struct in_addr);
+ m->m_len += sizeof (struct in_addr);
+ cp = mtod(m, u_char *) + sizeof (struct in_addr);
ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt);
- bzero(mtod(m, caddr_t), sizeof(struct in_addr));
+ bzero(mtod(m, caddr_t), sizeof (struct in_addr));
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[IPOPT_OPTVAL];
if (opt == IPOPT_NOP)
optlen = 1;
else {
- if (cnt < IPOPT_OLEN + sizeof(*cp))
+ if (cnt < IPOPT_OLEN + sizeof (*cp))
goto bad;
optlen = cp[IPOPT_OLEN];
- if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
+ if (optlen < IPOPT_OLEN + sizeof (*cp) || optlen > cnt)
goto bad;
}
switch (opt) {
* A is first hop destination, which doesn't appear in
* actual IP option, but is stored before the options.
*/
- if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr))
+ if (optlen < IPOPT_MINOFF - 1 + sizeof (struct in_addr))
goto bad;
- m->m_len -= sizeof(struct in_addr);
- cnt -= sizeof(struct in_addr);
- optlen -= sizeof(struct in_addr);
+ m->m_len -= sizeof (struct in_addr);
+ cnt -= sizeof (struct in_addr);
+ optlen -= sizeof (struct in_addr);
cp[IPOPT_OLEN] = optlen;
/*
* Move first hop before start of options.
*/
bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t),
- sizeof(struct in_addr));
+ sizeof (struct in_addr));
/*
* Then copy rest of options back
* to close up the deleted entry.
*/
ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] +
- sizeof(struct in_addr)),
+ sizeof (struct in_addr)),
(caddr_t)&cp[IPOPT_OFFSET+1],
- (unsigned)cnt + sizeof(struct in_addr));
+ (unsigned)cnt + sizeof (struct in_addr));
break;
}
}
- if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr))
+ if (m->m_len > MAX_IPOPTLEN + sizeof (struct in_addr))
goto bad;
*pcbopt = m;
return (0);
bad:
- (void)m_free(m);
+ (void) m_free(m);
return (EINVAL);
}
-/*
- * XXX
- * The whole multicast option thing needs to be re-thought.
- * Several of these options are equally applicable to non-multicast
- * transmission, and one (IP_MULTICAST_TTL) totally duplicates a
- * standard option (IP_TTL).
- */
+void
+ip_moptions_init(void)
+{
+ PE_parse_boot_argn("ifa_debug", &imo_debug, sizeof (imo_debug));
-/*
- * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index.
- */
-static struct ifnet *
-ip_multicast_if(a, ifindexp)
- struct in_addr *a;
- int *ifindexp;
+ imo_size = (imo_debug == 0) ? sizeof (struct ip_moptions) :
+ sizeof (struct ip_moptions_dbg);
+
+ imo_zone = zinit(imo_size, IMO_ZONE_MAX * imo_size, 0,
+ IMO_ZONE_NAME);
+ if (imo_zone == NULL) {
+ panic("%s: failed allocating %s", __func__, IMO_ZONE_NAME);
+ /* NOTREACHED */
+ }
+ zone_change(imo_zone, Z_EXPAND, TRUE);
+}
+
+void
+imo_addref(struct ip_moptions *imo, int locked)
+{
+ if (!locked)
+ IMO_LOCK(imo);
+ else
+ IMO_LOCK_ASSERT_HELD(imo);
+
+ if (++imo->imo_refcnt == 0) {
+ panic("%s: imo %p wraparound refcnt\n", __func__, imo);
+ /* NOTREACHED */
+ } else if (imo->imo_trace != NULL) {
+ (*imo->imo_trace)(imo, TRUE);
+ }
+
+ if (!locked)
+ IMO_UNLOCK(imo);
+}
+
+void
+imo_remref(struct ip_moptions *imo)
+{
+ int i;
+
+ IMO_LOCK(imo);
+ if (imo->imo_refcnt == 0) {
+ panic("%s: imo %p negative refcnt", __func__, imo);
+ /* NOTREACHED */
+ } else if (imo->imo_trace != NULL) {
+ (*imo->imo_trace)(imo, FALSE);
+ }
+
+ --imo->imo_refcnt;
+ if (imo->imo_refcnt > 0) {
+ IMO_UNLOCK(imo);
+ return;
+ }
+
+ for (i = 0; i < imo->imo_num_memberships; ++i) {
+ struct in_mfilter *imf;
+
+ imf = imo->imo_mfilters ? &imo->imo_mfilters[i] : NULL;
+ if (imf != NULL)
+ imf_leave(imf);
+
+ (void) in_leavegroup(imo->imo_membership[i], imf);
+
+ if (imf != NULL)
+ imf_purge(imf);
+
+ INM_REMREF(imo->imo_membership[i]);
+ imo->imo_membership[i] = NULL;
+ }
+ imo->imo_num_memberships = 0;
+ if (imo->imo_mfilters != NULL) {
+ FREE(imo->imo_mfilters, M_INMFILTER);
+ imo->imo_mfilters = NULL;
+ }
+ if (imo->imo_membership != NULL) {
+ FREE(imo->imo_membership, M_IPMOPTS);
+ imo->imo_membership = NULL;
+ }
+ IMO_UNLOCK(imo);
+
+ lck_mtx_destroy(&imo->imo_lock, ifa_mtx_grp);
+
+ if (!(imo->imo_debug & IFD_ALLOC)) {
+ panic("%s: imo %p cannot be freed", __func__, imo);
+ /* NOTREACHED */
+ }
+ zfree(imo_zone, imo);
+}
+
+static void
+imo_trace(struct ip_moptions *imo, int refhold)
{
- int ifindex;
- struct ifnet *ifp;
-
- if (ifindexp)
- *ifindexp = 0;
- if (ntohl(a->s_addr) >> 24 == 0) {
- ifindex = ntohl(a->s_addr) & 0xffffff;
- if (ifindex < 0 || if_index < ifindex)
- return NULL;
- ifp = ifindex2ifnet[ifindex];
- if (ifindexp)
- *ifindexp = ifindex;
+ struct ip_moptions_dbg *imo_dbg = (struct ip_moptions_dbg *)imo;
+ ctrace_t *tr;
+ u_int32_t idx;
+ u_int16_t *cnt;
+
+ if (!(imo->imo_debug & IFD_DEBUG)) {
+ panic("%s: imo %p has no debug structure", __func__, imo);
+ /* NOTREACHED */
+ }
+ if (refhold) {
+ cnt = &imo_dbg->imo_refhold_cnt;
+ tr = imo_dbg->imo_refhold;
} else {
- INADDR_TO_IFP(*a, ifp);
+ cnt = &imo_dbg->imo_refrele_cnt;
+ tr = imo_dbg->imo_refrele;
+ }
+
+ idx = atomic_add_16_ov(cnt, 1) % IMO_TRACE_HIST_SIZE;
+ ctrace_record(&tr[idx]);
+}
+
+struct ip_moptions *
+ip_allocmoptions(int how)
+{
+ struct ip_moptions *imo;
+
+ imo = (how == M_WAITOK) ? zalloc(imo_zone) : zalloc_noblock(imo_zone);
+ if (imo != NULL) {
+ bzero(imo, imo_size);
+ lck_mtx_init(&imo->imo_lock, ifa_mtx_grp, ifa_mtx_attr);
+ imo->imo_debug |= IFD_ALLOC;
+ if (imo_debug != 0) {
+ imo->imo_debug |= IFD_DEBUG;
+ imo->imo_trace = imo_trace;
+ }
+ IMO_ADDREF(imo);
}
- return ifp;
+
+ return (imo);
}
/*
- * Set the IP multicast options in response to user setsockopt().
+ * Routine called from ip_output() to loop back a copy of an IP multicast
+ * packet to the input queue of a specified interface. Note that this
+ * calls the output routine of the loopback "driver", but with an interface
+ * pointer that might NOT be a loopback interface -- evil, but easier than
+ * replicating that code here.
*/
-static int
-ip_setmoptions(sopt, imop)
- struct sockopt *sopt;
- struct ip_moptions **imop;
+static void
+ip_mloopback(struct ifnet *srcifp, struct ifnet *origifp, struct mbuf *m,
+ struct sockaddr_in *dst, int hlen)
{
- int error = 0;
- int i;
- struct in_addr addr;
- struct ip_mreq mreq;
- struct ifnet *ifp = NULL;
- struct ip_moptions *imo = *imop;
- struct route ro;
- struct sockaddr_in *dst;
- int ifindex;
- int s;
+ struct mbuf *copym;
+ struct ip *ip;
- if (imo == NULL) {
- /*
- * No multicast option buffer attached to the pcb;
- * allocate one and initialize to default values.
- */
- imo = (struct ip_moptions*) _MALLOC(sizeof(*imo), M_IPMOPTS,
- M_WAITOK);
-
- if (imo == NULL)
- return (ENOBUFS);
- *imop = imo;
- imo->imo_multicast_ifp = NULL;
- imo->imo_multicast_addr.s_addr = INADDR_ANY;
- imo->imo_multicast_vif = -1;
- imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
- imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
- imo->imo_num_memberships = 0;
- }
-
- switch (sopt->sopt_name) {
- /* store an index number for the vif you wanna use in the send */
- case IP_MULTICAST_VIF:
- if (legal_vif_num == 0) {
- error = EOPNOTSUPP;
- break;
- }
- error = sooptcopyin(sopt, &i, sizeof i, sizeof i);
- if (error)
- break;
- if (!legal_vif_num(i) && (i != -1)) {
- error = EINVAL;
- break;
- }
- imo->imo_multicast_vif = i;
- break;
+ if (lo_ifp == NULL)
+ return;
- case IP_MULTICAST_IF:
- /*
- * Select the interface for outgoing multicast packets.
- */
- error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr);
- if (error)
- break;
- /*
- * INADDR_ANY is used to remove a previous selection.
- * When no interface is selected, a default one is
- * chosen every time a multicast packet is sent.
- */
- if (addr.s_addr == INADDR_ANY) {
- imo->imo_multicast_ifp = NULL;
- break;
- }
- /*
- * The selected interface is identified by its local
- * IP address. Find the interface and confirm that
- * it supports multicasting.
- */
- s = splimp();
- ifp = ip_multicast_if(&addr, &ifindex);
- if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
- splx(s);
- error = EADDRNOTAVAIL;
- break;
- }
- imo->imo_multicast_ifp = ifp;
- if (ifindex)
- imo->imo_multicast_addr = addr;
- else
- imo->imo_multicast_addr.s_addr = INADDR_ANY;
- splx(s);
- break;
+ /*
+ * Copy the packet header as it's needed for the checksum
+ * Make sure to deep-copy IP header portion in case the data
+ * is in an mbuf cluster, so that we can safely override the IP
+ * header portion later.
+ */
+ copym = m_copym_mode(m, 0, M_COPYALL, M_DONTWAIT, M_COPYM_COPY_HDR);
+ if (copym != NULL && ((copym->m_flags & M_EXT) || copym->m_len < hlen))
+ copym = m_pullup(copym, hlen);
- case IP_MULTICAST_TTL:
- /*
- * Set the IP time-to-live for outgoing multicast packets.
- * The original multicast API required a char argument,
- * which is inconsistent with the rest of the socket API.
- * We allow either a char or an int.
- */
- if (sopt->sopt_valsize == 1) {
- u_char ttl;
- error = sooptcopyin(sopt, &ttl, 1, 1);
- if (error)
- break;
- imo->imo_multicast_ttl = ttl;
- } else {
- u_int ttl;
- error = sooptcopyin(sopt, &ttl, sizeof ttl,
- sizeof ttl);
- if (error)
+ if (copym == NULL)
+ return;
+
+ /*
+ * We don't bother to fragment if the IP length is greater
+ * than the interface's MTU. Can this possibly matter?
+ */
+ ip = mtod(copym, struct ip *);
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+ ip->ip_sum = 0;
+ ip->ip_sum = ip_cksum_hdr_out(copym, hlen);
+
+ /*
+ * Mark checksum as valid unless receive checksum offload is
+ * disabled; if so, compute checksum in software. If the
+ * interface itself is lo0, this will be overridden by if_loop.
+ */
+ if (hwcksum_rx) {
+ copym->m_pkthdr.csum_flags &= ~(CSUM_PARTIAL|CSUM_ZERO_INVERT);
+ copym->m_pkthdr.csum_flags |=
+ CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
+ copym->m_pkthdr.csum_data = 0xffff;
+ } else if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_len);
+#endif
+ in_delayed_cksum(copym);
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+#endif
+ }
+
+ /*
+ * Stuff the 'real' ifp into the pkthdr, to be used in matching
+ * in ip_input(); we need the loopback ifp/dl_tag passed as args
+ * to make the loopback driver compliant with the data link
+ * requirements.
+ */
+ copym->m_pkthdr.rcvif = origifp;
+
+ /*
+ * Also record the source interface (which owns the source address).
+ * This is basically a stripped down version of ifa_foraddr().
+ */
+ if (srcifp == NULL) {
+ struct in_ifaddr *ia;
+
+ lck_rw_lock_shared(in_ifaddr_rwlock);
+ TAILQ_FOREACH(ia, INADDR_HASH(ip->ip_src.s_addr), ia_hash) {
+ IFA_LOCK_SPIN(&ia->ia_ifa);
+ if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_src.s_addr) {
+ srcifp = ia->ia_ifp;
+ IFA_UNLOCK(&ia->ia_ifa);
break;
- if (ttl > 255)
- error = EINVAL;
- else
- imo->imo_multicast_ttl = ttl;
+ }
+ IFA_UNLOCK(&ia->ia_ifa);
}
- break;
+ lck_rw_done(in_ifaddr_rwlock);
+ }
+ if (srcifp != NULL)
+ ip_setsrcifaddr_info(copym, srcifp->if_index, NULL);
+ ip_setdstifaddr_info(copym, origifp->if_index, NULL);
+
+ dlil_output(lo_ifp, PF_INET, copym, NULL, SA(dst), 0, NULL);
+}
+
+/*
+ * Given a source IP address (and route, if available), determine the best
+ * interface to send the packet from. Checking for (and updating) the
+ * ROF_SRCIF_SELECTED flag in the pcb-supplied route placeholder is done
+ * without any locks based on the assumption that ip_output() is single-
+ * threaded per-pcb, i.e. for any given pcb there can only be one thread
+ * performing output at the IP layer.
+ *
+ * This routine is analogous to in6_selectroute() for IPv6.
+ */
+static struct ifaddr *
+in_selectsrcif(struct ip *ip, struct route *ro, unsigned int ifscope)
+{
+ struct ifaddr *ifa = NULL;
+ struct in_addr src = ip->ip_src;
+ struct in_addr dst = ip->ip_dst;
+ struct ifnet *rt_ifp;
+ char s_src[MAX_IPv4_STR_LEN], s_dst[MAX_IPv4_STR_LEN];
+
+ VERIFY(src.s_addr != INADDR_ANY);
+
+ if (ip_select_srcif_debug) {
+ (void) inet_ntop(AF_INET, &src.s_addr, s_src, sizeof (s_src));
+ (void) inet_ntop(AF_INET, &dst.s_addr, s_dst, sizeof (s_dst));
+ }
+
+ if (ro->ro_rt != NULL)
+ RT_LOCK(ro->ro_rt);
+
+ rt_ifp = (ro->ro_rt != NULL) ? ro->ro_rt->rt_ifp : NULL;
+
+ /*
+ * Given the source IP address, find a suitable source interface
+ * to use for transmission; if the caller has specified a scope,
+ * optimize the search by looking at the addresses only for that
+ * interface. This is still suboptimal, however, as we need to
+ * traverse the per-interface list.
+ */
+ if (ifscope != IFSCOPE_NONE || ro->ro_rt != NULL) {
+ unsigned int scope = ifscope;
- case IP_MULTICAST_LOOP:
/*
- * Set the loopback flag for outgoing multicast packets.
- * Must be zero or one. The original multicast API required a
- * char argument, which is inconsistent with the rest
- * of the socket API. We allow either a char or an int.
+ * If no scope is specified and the route is stale (pointing
+ * to a defunct interface) use the current primary interface;
+ * this happens when switching between interfaces configured
+ * with the same IP address. Otherwise pick up the scope
+ * information from the route; the ULP may have looked up a
+ * correct route and we just need to verify it here and mark
+ * it with the ROF_SRCIF_SELECTED flag below.
*/
- if (sopt->sopt_valsize == 1) {
- u_char loop;
- error = sooptcopyin(sopt, &loop, 1, 1);
- if (error)
- break;
- imo->imo_multicast_loop = !!loop;
- } else {
- u_int loop;
- error = sooptcopyin(sopt, &loop, sizeof loop,
- sizeof loop);
- if (error)
- break;
- imo->imo_multicast_loop = !!loop;
+ if (scope == IFSCOPE_NONE) {
+ scope = rt_ifp->if_index;
+ if (scope != get_primary_ifscope(AF_INET) &&
+ ROUTE_UNUSABLE(ro))
+ scope = get_primary_ifscope(AF_INET);
}
- break;
- case IP_ADD_MEMBERSHIP:
- /*
- * Add a multicast group membership.
- * Group must be a valid IP multicast address.
- */
- error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
- if (error)
- break;
+ ifa = (struct ifaddr *)ifa_foraddr_scoped(src.s_addr, scope);
- if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
- error = EINVAL;
- break;
- }
- s = splimp();
- /*
- * If no interface address was provided, use the interface of
- * the route to the given multicast address.
- */
- if (mreq.imr_interface.s_addr == INADDR_ANY) {
- bzero((caddr_t)&ro, sizeof(ro));
- dst = (struct sockaddr_in *)&ro.ro_dst;
- dst->sin_len = sizeof(*dst);
- dst->sin_family = AF_INET;
- dst->sin_addr = mreq.imr_multiaddr;
- rtalloc(&ro);
- if (ro.ro_rt != NULL) {
- ifp = ro.ro_rt->rt_ifp;
- rtfree(ro.ro_rt);
- }
- else {
- /* If there's no default route, try using loopback */
- mreq.imr_interface.s_addr = INADDR_LOOPBACK;
+ if (ifa == NULL && ip->ip_p != IPPROTO_UDP &&
+ ip->ip_p != IPPROTO_TCP && ipforwarding) {
+ /*
+ * If forwarding is enabled, and if the packet isn't
+ * TCP or UDP, check if the source address belongs
+ * to one of our own interfaces; if so, demote the
+ * interface scope and do a route lookup right below.
+ */
+ ifa = (struct ifaddr *)ifa_foraddr(src.s_addr);
+ if (ifa != NULL) {
+ IFA_REMREF(ifa);
+ ifa = NULL;
+ ifscope = IFSCOPE_NONE;
}
}
-
- if (ifp == NULL) {
- ifp = ip_multicast_if(&mreq.imr_interface, NULL);
- }
- /*
- * See if we found an interface, and confirm that it
- * supports multicast.
- */
- if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
- error = EADDRNOTAVAIL;
- splx(s);
- break;
- }
- /*
- * See if the membership already exists or if all the
- * membership slots are full.
- */
- for (i = 0; i < imo->imo_num_memberships; ++i) {
- if (imo->imo_membership[i]->inm_ifp == ifp &&
- imo->imo_membership[i]->inm_addr.s_addr
- == mreq.imr_multiaddr.s_addr)
- break;
- }
- if (i < imo->imo_num_memberships) {
- error = EADDRINUSE;
- splx(s);
- break;
- }
- if (i == IP_MAX_MEMBERSHIPS) {
- error = ETOOMANYREFS;
- splx(s);
- break;
- }
- /*
- * Everything looks good; add a new record to the multicast
- * address list for the given interface.
- */
- if ((imo->imo_membership[i] =
- in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
- error = ENOBUFS;
- splx(s);
- break;
+ if (ip_select_srcif_debug && ifa != NULL) {
+ if (ro->ro_rt != NULL) {
+ printf("%s->%s ifscope %d->%d ifa_if %s "
+ "ro_if %s\n", s_src, s_dst, ifscope,
+ scope, if_name(ifa->ifa_ifp),
+ if_name(rt_ifp));
+ } else {
+ printf("%s->%s ifscope %d->%d ifa_if %s\n",
+ s_src, s_dst, ifscope, scope,
+ if_name(ifa->ifa_ifp));
+ }
}
- ++imo->imo_num_memberships;
- splx(s);
- break;
+ }
+
+ /*
+ * Slow path; search for an interface having the corresponding source
+ * IP address if the scope was not specified by the caller, and:
+ *
+ * 1) There currently isn't any route, or,
+ * 2) The interface used by the route does not own that source
+ * IP address; in this case, the route will get blown away
+ * and we'll do a more specific scoped search using the newly
+ * found interface.
+ */
+ if (ifa == NULL && ifscope == IFSCOPE_NONE) {
+ ifa = (struct ifaddr *)ifa_foraddr(src.s_addr);
- case IP_DROP_MEMBERSHIP:
/*
- * Drop a multicast group membership.
- * Group must be a valid IP multicast address.
+ * If we have the IP address, but not the route, we don't
+ * really know whether or not it belongs to the correct
+ * interface (it could be shared across multiple interfaces.)
+ * The only way to find out is to do a route lookup.
*/
- error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
- if (error)
- break;
+ if (ifa != NULL && ro->ro_rt == NULL) {
+ struct rtentry *rt;
+ struct sockaddr_in sin;
+ struct ifaddr *oifa = NULL;
+
+ bzero(&sin, sizeof (sin));
+ sin.sin_family = AF_INET;
+ sin.sin_len = sizeof (sin);
+ sin.sin_addr = dst;
+
+ lck_mtx_lock(rnh_lock);
+ if ((rt = rt_lookup(TRUE, SA(&sin), NULL,
+ rt_tables[AF_INET], IFSCOPE_NONE)) != NULL) {
+ RT_LOCK(rt);
+ /*
+ * If the route uses a different interface,
+ * use that one instead. The IP address of
+ * the ifaddr that we pick up here is not
+ * relevant.
+ */
+ if (ifa->ifa_ifp != rt->rt_ifp) {
+ oifa = ifa;
+ ifa = rt->rt_ifa;
+ IFA_ADDREF(ifa);
+ RT_UNLOCK(rt);
+ } else {
+ RT_UNLOCK(rt);
+ }
+ rtfree_locked(rt);
+ }
+ lck_mtx_unlock(rnh_lock);
- if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
- error = EINVAL;
- break;
- }
+ if (oifa != NULL) {
+ struct ifaddr *iifa;
- s = splimp();
- /*
- * If an interface address was specified, get a pointer
- * to its ifnet structure.
- */
- if (mreq.imr_interface.s_addr == INADDR_ANY)
- ifp = NULL;
- else {
- ifp = ip_multicast_if(&mreq.imr_interface, NULL);
- if (ifp == NULL) {
- error = EADDRNOTAVAIL;
- splx(s);
- break;
+ /*
+ * See if the interface pointed to by the
+ * route is configured with the source IP
+ * address of the packet.
+ */
+ iifa = (struct ifaddr *)ifa_foraddr_scoped(
+ src.s_addr, ifa->ifa_ifp->if_index);
+
+ if (iifa != NULL) {
+ /*
+ * Found it; drop the original one
+ * as well as the route interface
+ * address, and use this instead.
+ */
+ IFA_REMREF(oifa);
+ IFA_REMREF(ifa);
+ ifa = iifa;
+ } else if (!ipforwarding ||
+ (rt->rt_flags & RTF_GATEWAY)) {
+ /*
+ * This interface doesn't have that
+ * source IP address; drop the route
+ * interface address and just use the
+ * original one, and let the caller
+ * do a scoped route lookup.
+ */
+ IFA_REMREF(ifa);
+ ifa = oifa;
+ } else {
+ /*
+ * Forwarding is enabled and the source
+ * address belongs to one of our own
+ * interfaces which isn't the outgoing
+ * interface, and we have a route, and
+ * the destination is on a network that
+ * is directly attached (onlink); drop
+ * the original one and use the route
+ * interface address instead.
+ */
+ IFA_REMREF(oifa);
+ }
}
+ } else if (ifa != NULL && ro->ro_rt != NULL &&
+ !(ro->ro_rt->rt_flags & RTF_GATEWAY) &&
+ ifa->ifa_ifp != ro->ro_rt->rt_ifp && ipforwarding) {
+ /*
+ * Forwarding is enabled and the source address belongs
+ * to one of our own interfaces which isn't the same
+ * as the interface used by the known route; drop the
+ * original one and use the route interface address.
+ */
+ IFA_REMREF(ifa);
+ ifa = ro->ro_rt->rt_ifa;
+ IFA_ADDREF(ifa);
}
- /*
- * Find the membership in the membership array.
- */
- for (i = 0; i < imo->imo_num_memberships; ++i) {
- if ((ifp == NULL ||
- imo->imo_membership[i]->inm_ifp == ifp) &&
- imo->imo_membership[i]->inm_addr.s_addr ==
- mreq.imr_multiaddr.s_addr)
- break;
+
+ if (ip_select_srcif_debug && ifa != NULL) {
+ printf("%s->%s ifscope %d ifa_if %s\n",
+ s_src, s_dst, ifscope, if_name(ifa->ifa_ifp));
}
- if (i == imo->imo_num_memberships) {
- error = EADDRNOTAVAIL;
- splx(s);
- break;
+ }
+
+ if (ro->ro_rt != NULL)
+ RT_LOCK_ASSERT_HELD(ro->ro_rt);
+ /*
+ * If there is a non-loopback route with the wrong interface, or if
+ * there is no interface configured with such an address, blow it
+ * away. Except for local/loopback, we look for one with a matching
+ * interface scope/index.
+ */
+ if (ro->ro_rt != NULL &&
+ (ifa == NULL || (ifa->ifa_ifp != rt_ifp && rt_ifp != lo_ifp) ||
+ !(ro->ro_rt->rt_flags & RTF_UP))) {
+ if (ip_select_srcif_debug) {
+ if (ifa != NULL) {
+ printf("%s->%s ifscope %d ro_if %s != "
+ "ifa_if %s (cached route cleared)\n",
+ s_src, s_dst, ifscope, if_name(rt_ifp),
+ if_name(ifa->ifa_ifp));
+ } else {
+ printf("%s->%s ifscope %d ro_if %s "
+ "(no ifa_if found)\n",
+ s_src, s_dst, ifscope, if_name(rt_ifp));
+ }
}
+
+ RT_UNLOCK(ro->ro_rt);
+ ROUTE_RELEASE(ro);
+
/*
- * Give up the multicast address record to which the
- * membership points.
- */
- in_delmulti(imo->imo_membership[i]);
- /*
- * Remove the gap in the membership array.
+ * If the destination is IPv4 LLA and the route's interface
+ * doesn't match the source interface, then the source IP
+ * address is wrong; it most likely belongs to the primary
+ * interface associated with the IPv4 LL subnet. Drop the
+ * packet rather than letting it go out and return an error
+ * to the ULP. This actually applies not only to IPv4 LL
+ * but other shared subnets; for now we explicitly test only
+ * for the former case and save the latter for future.
*/
- for (++i; i < imo->imo_num_memberships; ++i)
- imo->imo_membership[i-1] = imo->imo_membership[i];
- --imo->imo_num_memberships;
- splx(s);
- break;
+ if (IN_LINKLOCAL(ntohl(dst.s_addr)) &&
+ !IN_LINKLOCAL(ntohl(src.s_addr)) && ifa != NULL) {
+ IFA_REMREF(ifa);
+ ifa = NULL;
+ }
+ }
- default:
- error = EOPNOTSUPP;
- break;
+ if (ip_select_srcif_debug && ifa == NULL) {
+ printf("%s->%s ifscope %d (neither ro_if/ifa_if found)\n",
+ s_src, s_dst, ifscope);
}
/*
- * If all options have default values, no need to keep the mbuf.
+ * If there is a route, mark it accordingly. If there isn't one,
+ * we'll get here again during the next transmit (possibly with a
+ * route) and the flag will get set at that point. For IPv4 LLA
+ * destination, mark it only if the route has been fully resolved;
+ * otherwise we want to come back here again when the route points
+ * to the interface over which the ARP reply arrives on.
*/
- if (imo->imo_multicast_ifp == NULL &&
- imo->imo_multicast_vif == -1 &&
- imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
- imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
- imo->imo_num_memberships == 0) {
- FREE(*imop, M_IPMOPTS);
- *imop = NULL;
+ if (ro->ro_rt != NULL && (!IN_LINKLOCAL(ntohl(dst.s_addr)) ||
+ (ro->ro_rt->rt_gateway->sa_family == AF_LINK &&
+ SDL(ro->ro_rt->rt_gateway)->sdl_alen != 0))) {
+ if (ifa != NULL)
+ IFA_ADDREF(ifa); /* for route */
+ if (ro->ro_srcia != NULL)
+ IFA_REMREF(ro->ro_srcia);
+ ro->ro_srcia = ifa;
+ ro->ro_flags |= ROF_SRCIF_SELECTED;
+ RT_GENID_SYNC(ro->ro_rt);
}
- return (error);
+ if (ro->ro_rt != NULL)
+ RT_UNLOCK(ro->ro_rt);
+
+ return (ifa);
}
-/*
- * Return the IP multicast options in response to user getsockopt().
- */
-static int
-ip_getmoptions(sopt, imo)
- struct sockopt *sopt;
- register struct ip_moptions *imo;
+void
+ip_output_checksum(struct ifnet *ifp, struct mbuf *m, int hlen, int ip_len,
+ uint32_t *sw_csum)
{
- struct in_addr addr;
- struct in_ifaddr *ia;
- int error, optval;
- u_char coptval;
+ int tso = TSO_IPV4_OK(ifp, m);
+ uint32_t hwcap = ifp->if_hwassist;
- error = 0;
- switch (sopt->sopt_name) {
- case IP_MULTICAST_VIF:
- if (imo != NULL)
- optval = imo->imo_multicast_vif;
- else
- optval = -1;
- error = sooptcopyout(sopt, &optval, sizeof optval);
- break;
+ m->m_pkthdr.csum_flags |= CSUM_IP;
+
+ if (!hwcksum_tx) {
+ /* do all in software; hardware checksum offload is disabled */
+ *sw_csum = (CSUM_DELAY_DATA | CSUM_DELAY_IP) &
+ m->m_pkthdr.csum_flags;
+ } else {
+ /* do in software what the hardware cannot */
+ *sw_csum = m->m_pkthdr.csum_flags &
+ ~IF_HWASSIST_CSUM_FLAGS(hwcap);
+ }
- case IP_MULTICAST_IF:
- if (imo == NULL || imo->imo_multicast_ifp == NULL)
- addr.s_addr = INADDR_ANY;
- else if (imo->imo_multicast_addr.s_addr) {
- /* return the value user has set */
- addr = imo->imo_multicast_addr;
+ if (hlen != sizeof (struct ip)) {
+ *sw_csum |= ((CSUM_DELAY_DATA | CSUM_DELAY_IP) &
+ m->m_pkthdr.csum_flags);
+ } else if (!(*sw_csum & CSUM_DELAY_DATA) && (hwcap & CSUM_PARTIAL)) {
+ /*
+ * Partial checksum offload, if non-IP fragment, and TCP only
+ * (no UDP support, as the hardware may not be able to convert
+ * +0 to -0 (0xffff) per RFC1122 4.1.3.4. unless the interface
+ * supports "invert zero" capability.)
+ */
+ if (hwcksum_tx && !tso &&
+ ((m->m_pkthdr.csum_flags & CSUM_TCP) ||
+ ((hwcap & CSUM_ZERO_INVERT) &&
+ (m->m_pkthdr.csum_flags & CSUM_ZERO_INVERT))) &&
+ ip_len <= ifp->if_mtu) {
+ uint16_t start = sizeof (struct ip);
+ uint16_t ulpoff = m->m_pkthdr.csum_data & 0xffff;
+ m->m_pkthdr.csum_flags |=
+ (CSUM_DATA_VALID | CSUM_PARTIAL);
+ m->m_pkthdr.csum_tx_stuff = (ulpoff + start);
+ m->m_pkthdr.csum_tx_start = start;
+ /* do IP hdr chksum in software */
+ *sw_csum = CSUM_DELAY_IP;
} else {
- IFP_TO_IA(imo->imo_multicast_ifp, ia);
- addr.s_addr = (ia == NULL) ? INADDR_ANY
- : IA_SIN(ia)->sin_addr.s_addr;
+ *sw_csum |= (CSUM_DELAY_DATA & m->m_pkthdr.csum_flags);
}
- error = sooptcopyout(sopt, &addr, sizeof addr);
- break;
-
- case IP_MULTICAST_TTL:
- if (imo == 0)
- optval = coptval = IP_DEFAULT_MULTICAST_TTL;
- else
- optval = coptval = imo->imo_multicast_ttl;
- if (sopt->sopt_valsize == 1)
- error = sooptcopyout(sopt, &coptval, 1);
- else
- error = sooptcopyout(sopt, &optval, sizeof optval);
- break;
-
- case IP_MULTICAST_LOOP:
- if (imo == 0)
- optval = coptval = IP_DEFAULT_MULTICAST_LOOP;
- else
- optval = coptval = imo->imo_multicast_loop;
- if (sopt->sopt_valsize == 1)
- error = sooptcopyout(sopt, &coptval, 1);
- else
- error = sooptcopyout(sopt, &optval, sizeof optval);
- break;
-
- default:
- error = ENOPROTOOPT;
- break;
}
- return (error);
-}
-/*
- * Discard the IP multicast options.
- */
-void
-ip_freemoptions(imo)
- register struct ip_moptions *imo;
-{
- register int i;
+ if (*sw_csum & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ *sw_csum &= ~CSUM_DELAY_DATA;
+ }
- if (imo != NULL) {
- for (i = 0; i < imo->imo_num_memberships; ++i)
- if (imo->imo_membership[i] != NULL)
- in_delmulti(imo->imo_membership[i]);
- FREE(imo, M_IPMOPTS);
+ if (hwcksum_tx) {
+ /*
+ * Drop off bits that aren't supported by hardware;
+ * also make sure to preserve non-checksum related bits.
+ */
+ m->m_pkthdr.csum_flags =
+ ((m->m_pkthdr.csum_flags &
+ (IF_HWASSIST_CSUM_FLAGS(hwcap) | CSUM_DATA_VALID)) |
+ (m->m_pkthdr.csum_flags & ~IF_HWASSIST_CSUM_MASK));
+ } else {
+ /* drop all bits; hardware checksum offload is disabled */
+ m->m_pkthdr.csum_flags = 0;
}
}
/*
- * Routine called from ip_output() to loop back a copy of an IP multicast
- * packet to the input queue of a specified interface. Note that this
- * calls the output routine of the loopback "driver", but with an interface
- * pointer that might NOT be a loopback interface -- evil, but easier than
- * replicating that code here.
+ * GRE protocol output for PPP/PPTP
*/
-static void
-ip_mloopback(ifp, m, dst, hlen)
- struct ifnet *ifp;
- register struct mbuf *m;
- register struct sockaddr_in *dst;
- int hlen;
+int
+ip_gre_output(struct mbuf *m)
{
- register struct ip *ip;
- struct mbuf *copym;
+ struct route ro;
+ int error;
- copym = m_copy(m, 0, M_COPYALL);
- if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen))
- copym = m_pullup(copym, hlen);
- if (copym != NULL) {
- /*
- * We don't bother to fragment if the IP length is greater
- * than the interface's MTU. Can this possibly matter?
- */
- ip = mtod(copym, struct ip *);
- HTONS(ip->ip_len);
- HTONS(ip->ip_off);
- ip->ip_sum = 0;
- ip->ip_sum = in_cksum(copym, hlen);
- /*
- * NB:
- * It's not clear whether there are any lingering
- * reentrancy problems in other areas which might
- * be exposed by using ip_input directly (in
- * particular, everything which modifies the packet
- * in-place). Yet another option is using the
- * protosw directly to deliver the looped back
- * packet. For the moment, we'll err on the side
- * of safety by using if_simloop().
- */
-#if 1 /* XXX */
- if (dst->sin_family != AF_INET) {
- printf("ip_mloopback: bad address family %d\n",
- dst->sin_family);
- dst->sin_family = AF_INET;
- }
-#endif
+ bzero(&ro, sizeof (ro));
+ error = ip_output(m, NULL, &ro, 0, NULL, NULL);
- /*
- * Mark checksum as valid or calculate checksum for loopback.
- *
- * This is done this way because we have to embed the ifp of
- * the interface we will send the original copy of the packet
- * out on in the mbuf. ip_input will check if_hwassist of the
- * embedded ifp and ignore all csum_flags if if_hwassist is 0.
- * The UDP checksum has not been calculated yet.
- */
- if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
- if (ifp->if_hwassist) {
- copym->m_pkthdr.csum_flags |=
- CSUM_DATA_VALID | CSUM_PSEUDO_HDR |
- CSUM_IP_CHECKED | CSUM_IP_VALID;
- copym->m_pkthdr.csum_data = 0xffff;
- } else {
- NTOHS(ip->ip_len);
- in_delayed_cksum(copym);
- HTONS(ip->ip_len);
- }
- }
+ ROUTE_RELEASE(&ro);
+ return (error);
+}
- /*
- * TedW:
- * We need to send all loopback traffic down to dlil in case
- * a filter has tapped-in.
- */
+static int
+sysctl_reset_ip_output_stats SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+ int error, i;
- if (lo_dl_tag == 0)
- dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dl_tag);
+ i = ip_output_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_output_measure != i && i == 1) {
+ net_perf_initialize(&net_perf, ip_output_measure_bins);
+ }
+ ip_output_measure = i;
+done:
+ return (error);
+}
- /*
- * Stuff the 'real' ifp into the pkthdr, to be used in matching
- * in ip_input(); we need the loopback ifp/dl_tag passed as args
- * to make the loopback driver compliant with the data link
- * requirements.
- */
- if (lo_dl_tag) {
- copym->m_pkthdr.rcvif = ifp;
- dlil_output(lo_dl_tag, copym, 0, (struct sockaddr *) dst, 0);
- } else {
- printf("Warning: ip_output call to dlil_find_dltag failed!\n");
- m_freem(copym);
- }
+static int
+sysctl_ip_output_measure_bins SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+ int error;
+ uint64_t i;
-/* if_simloop(ifp, copym, (struct sockaddr *)dst, 0);*/
+ i = ip_output_measure_bins;
+ error = sysctl_handle_quad(oidp, &i, 0, req);
+ if (error || req->newptr == USER_ADDR_NULL)
+ goto done;
+ /* validate data */
+ if (!net_perf_validate_bins(i)) {
+ error = EINVAL;
+ goto done;
}
+ ip_output_measure_bins = i;
+done:
+ return (error);
+}
+
+static int
+sysctl_ip_output_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