/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * 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
* @(#)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
#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 <machine/endian.h>
+#include <pexpert/pexpert.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 <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
-#include "faith.h"
+#include <netinet/kpi_ipfilter_var.h>
+
+#if CONFIG_MACF_NET
+#include <security/mac_framework.h>
+#endif
#include <net/dlil.h>
#include <sys/kdebug.h>
+#include <libkern/OSAtomic.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)
#define DBG_FNC_IPSEC4_OUTPUT NETDBG_CODE(DBG_NETIP, (2 << 8) | 1)
-
-#if vax
-#include <machine/mtpr.h>
-#endif
-
-#if __FreeBSD__
-#include <machine/in_cksum.h>
-
-static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
-#endif
+#define SWAP16(v) ((((v) & 0xff) << 8) | ((v) >> 8))
#if IPSEC
#include <netinet6/ipsec.h>
#endif /*IPSEC*/
#include <netinet/ip_fw.h>
+#include <netinet/ip_divert.h>
+#include <mach/sdt.h>
#if DUMMYNET
#include <netinet/ip_dummynet.h>
#endif
+#if PF
+#include <net/pfvar.h>
+#endif /* PF */
+
#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,\
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_createmoptions(struct ip_moptions **imop);
-int ip_addmembership(struct ip_moptions *imo, struct ip_mreq *mreq);
-int ip_dropmembership(struct ip_moptions *imo, struct ip_mreq *mreq);
-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
+static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
+static void ip_mloopback(struct ifnet *, struct mbuf *,
+ struct sockaddr_in *, int);
+static int ip_pcbopts(int, struct mbuf **, struct mbuf *);
+static void imo_trace(struct ip_moptions *, int);
-static u_long lo_dl_tag = 0;
+static void ip_out_cksum_stats(int, u_int32_t);
+static struct ifaddr *in_selectsrcif(struct ip *, struct route *, unsigned int);
-void in_delayed_cksum(struct mbuf *m);
-extern int apple_hwcksum_tx;
-extern u_long route_generation;
+int ip_optcopy(struct ip *, struct ip *);
+void in_delayed_cksum_offset(struct mbuf *, int );
+void in_cksum_offset(struct mbuf* , size_t );
extern struct protosw inetsw[];
extern struct ip_linklocal_stat ip_linklocal_stat;
+extern lck_mtx_t *ip_mutex;
/* temporary: for testing */
#if IPSEC
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");
+
+#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;
+ int error;
+ error = ip_output_list(m0, 0, opt, ro, flags, imo, ipoa);
+ return error;
+}
+
+/*
+ * Returns: 0 Success
+ * ENOMEM
+ * EADDRNOTAVAIL
+ * ENETUNREACH
+ * EHOSTUNREACH
+ * EACCES
+ * EMSGSIZE
+ * ENOBUFS
+ * ipsec4_getpolicybyaddr:??? [IPSEC 4th argument, contents modified]
+ * ipsec4_getpolicybysock:??? [IPSEC 4th argument, contents modified]
+ * key_spdacquire:??? [IPSEC]
+ * ipsec4_output:??? [IPSEC]
+ * ip_dn_io_ptr:??? [dummynet]
+ * dlil_output:??? [DLIL]
+ * dlil_output_list:??? [DLIL]
+ *
+ * Notes: The ipsec4_getpolicyby{addr|sock} function error returns are
+ * only used as the error return from this function where one of
+ * these functions fails to return a policy.
+ */
+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;
- struct mbuf *m = m0;
+ struct mbuf *m = m0, *prevnxt = NULL, **mppn = &prevnxt;
int hlen = sizeof (struct ip);
- int len, off, error = 0;
+ int len = 0, error = 0;
struct sockaddr_in *dst = NULL;
- struct in_ifaddr *ia = NULL;
+ struct in_ifaddr *ia = NULL, *src_ia = NULL;
int isbroadcast, sw_csum;
+ struct in_addr pkt_dst;
+ struct ipf_pktopts *ippo = NULL, ipf_pktopts;
#if IPSEC
- struct route iproute;
+ struct ipsec_output_state ipsec_state;
+ struct route *ipsec_saved_route = NULL;
struct socket *so = NULL;
struct secpolicy *sp = NULL;
#endif
- u_int16_t divert_cookie; /* firewall cookie */
#if IPFIREWALL_FORWARD
int fwd_rewrite_src = 0;
#endif
- struct ip_fw_chain *rule = NULL;
-
-#if IPDIVERT
- /* Get and reset firewall cookie */
- divert_cookie = ip_divert_cookie;
- ip_divert_cookie = 0;
-#else
- divert_cookie = 0;
+#if IPFIREWALL
+ int off;
+ struct sockaddr_in *next_hop_from_ipfwd_tag = NULL;
+#endif
+#if IPFIREWALL || DUMMYNET
+ struct ip_fw_args args;
+ struct m_tag *tag;
#endif
+ int didfilter = 0;
+ ipfilter_t inject_filter_ref = 0;
+#if DUMMYNET
+ struct route saved_route;
+ struct ip_out_args saved_ipoa;
+ struct sockaddr_in dst_buf;
+#endif /* DUMMYNET */
+ struct mbuf * packetlist;
+ int pktcnt = 0, tso = 0;
+ u_int32_t bytecnt = 0;
+ unsigned int ifscope = IFSCOPE_NONE;
+ unsigned int nocell = 0;
+ boolean_t select_srcif, srcbound;
+ struct flowadv *adv = NULL;
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 && (flags & IP_NOIPSEC) == 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
- if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
- so = ipsec_getsocket(m);
- (void)ipsec_setsocket(m, NULL);
+ bzero(&ipsec_state, sizeof(ipsec_state));
+#endif /* IPSEC */
+
+ packetlist = m0;
+#if IPFIREWALL || DUMMYNET
+ bzero(&args, sizeof(struct ip_fw_args));
+
+ 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
+#endif /* DUMMYNET */
+
+#if IPDIVERT
+ 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;
#if DIAGNOSTIC
- if ((m->m_flags & M_PKTHDR) == 0)
+ if ( !m || (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
+
+ bzero(&ipf_pktopts, sizeof(struct ipf_pktopts));
+ ippo = &ipf_pktopts;
+
+ if (ip_doscopedroute && (flags & IP_OUTARGS)) {
+ /*
+ * In the forwarding case, only the ifscope value is used,
+ * as source interface selection doesn't take place.
+ */
+ if ((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));
+ }
+
+ if ((srcbound = (ipoa->ipoa_flags & IPOAF_BOUND_SRCADDR)))
+ ipf_pktopts.ippo_flags |= IPPOF_BOUND_SRCADDR;
+ } else {
+ select_srcif = FALSE;
+ srcbound = FALSE;
+ ifscope = IFSCOPE_NONE;
+ }
+
+ if ((flags & IP_OUTARGS) && (ipoa->ipoa_flags & IPOAF_NO_CELLULAR)) {
+ nocell = 1;
+ ipf_pktopts.ippo_flags |= IPPOF_NO_IFT_CELLULAR;
+ }
+
+ if (flags & IP_OUTARGS) {
+ adv = &ipoa->ipoa_flowadv;
+ adv->code = FADV_SUCCESS;
+ }
+
+#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 IPSEC
+ if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
+ so = ipsec_getsocket(m);
+ (void)ipsec_setsocket(m, NULL);
+ }
+#endif /* IPSEC */
+#if IPFIREWALL
+ if (args.fwa_ipfw_rule != NULL)
+ goto skip_ipsec;
+#endif /* #if IPFIREWALL */
+ if (args.fwa_pf_rule != NULL)
+ goto sendit;
+ }
+#endif /* DUMMYNET */
+
+#if IPSEC
+ if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
+ so = ipsec_getsocket(m);
+ (void)ipsec_setsocket(m, NULL);
+ }
+#endif
+loopit:
+ /*
+ * 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 = 0;
+
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
+ pkt_dst = ip->ip_dst;
+#endif
+
+ /*
+ * 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.
*/
#else
ip->ip_id = htons(ip_id++);
#endif
- ipstat.ips_localout++;
+ OSAddAtomic(1, &ipstat.ips_localout);
} else {
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
}
+#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 = (struct sockaddr_in *)&ro->ro_dst;
+ dst = (struct sockaddr_in *)(void *)&ro->ro_dst;
/*
* If there is a cached route,
* cache with IPv6.
*/
- if (ro->ro_rt && (ro->ro_rt->generation_id != route_generation) &&
- ((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0) && (ip->ip_src.s_addr != INADDR_ANY) &&
- (ifa_foraddr(ip->ip_src.s_addr) == NULL)) {
- error = EADDRNOTAVAIL;
- goto bad;
- }
- if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
- dst->sin_family != AF_INET ||
- 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 (ro->ro_rt->generation_id != route_generation &&
+ ((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0) &&
+ (ip->ip_src.s_addr != INADDR_ANY)) {
+ src_ia = ifa_foraddr(ip->ip_src.s_addr);
+ if (src_ia == NULL) {
+ error = EADDRNOTAVAIL;
+ goto bad;
+ }
+ IFA_REMREF(&src_ia->ia_ifa);
+ }
+ /*
+ * 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 ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
+ dst->sin_family != AF_INET ||
+ dst->sin_addr.s_addr != pkt_dst.s_addr) {
+ rtfree(ro->ro_rt);
+ ro->ro_rt = NULL;
+ }
+ /*
+ * If we're doing source interface selection, we may not
+ * want to use this route; only synch up the generation
+ * count otherwise.
+ */
+ if (!select_srcif && ro->ro_rt != NULL &&
+ ro->ro_rt->generation_id != route_generation)
+ ro->ro_rt->generation_id = route_generation;
}
- 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_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)
+ IFA_REMREF(&ia->ia_ifa);
+ if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0) {
+ if ((ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) {
+ OSAddAtomic(1, &ipstat.ips_noroute);
+ error = ENETUNREACH;
+ goto bad;
+ }
}
ifp = ia->ia_ifp;
ip->ip_ttl = 1;
isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ } 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.
+ */
+ isbroadcast = 0;
+ if (ia != NULL)
+ IFA_REMREF(&ia->ia_ifa);
+
+ /* Macro takes reference on ia */
+ IFP_TO_IA(ifp, ia);
} else {
+ 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 (select_srcif && ip->ip_src.s_addr != INADDR_ANY &&
+ (ro->ro_rt == NULL || !(ro->ro_rt->rt_flags & RTF_UP) ||
+ ro->ro_rt->generation_id != route_generation ||
+ !(ro->ro_flags & ROF_SRCIF_SELECTED))) {
+ struct ifaddr *ifa;
+
+ /* Find the source interface */
+ ifa = in_selectsrcif(ip, ro, ifscope);
+
+ /*
+ * If the source address belongs to a cellular interface
+ * and the caller forbids our using interfaces of such
+ * type, pretend that there is no source address.
+ */
+ if (nocell && ifa != NULL &&
+ ifa->ifa_ifp->if_type == IFT_CELLULAR) {
+ IFA_REMREF(ifa);
+ error = EADDRNOTAVAIL;
+ 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 (ifa == NULL && (!(flags & IP_RAWOUTPUT) ||
+ 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 (ifa != NULL) {
+ if (ifscope == IFSCOPE_NONE)
+ ifscope = ifa->ifa_ifp->if_index;
+ IFA_REMREF(ifa);
+ 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 interface and the
+ * caller forbids our using interfaces of such type,
+ * pretend that there is no route.
+ */
+ if (nocell && ro->ro_rt != NULL) {
+ RT_LOCK_SPIN(ro->ro_rt);
+ if (ro->ro_rt->rt_ifp->if_type ==
+ IFT_CELLULAR) {
+ RT_UNLOCK(ro->ro_rt);
+ rtfree(ro->ro_rt);
+ ro->ro_rt = NULL;
+ } else {
+ RT_UNLOCK(ro->ro_rt);
+ }
+ }
+ }
+
+ if (ro->ro_rt == NULL) {
+ OSAddAtomic(1, &ipstat.ips_noroute);
error = EHOSTUNREACH;
goto bad;
}
+
+ if (ia)
+ IFA_REMREF(&ia->ia_ifa);
+ RT_LOCK_SPIN(ro->ro_rt);
ia = ifatoia(ro->ro_rt->rt_ifa);
+ if (ia) {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro->ro_rt);
+ IFA_ADDREF(&ia->ia_ifa);
+ }
ifp = ro->ro_rt->rt_ifp;
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)
+ if (ro->ro_rt->rt_flags & RTF_GATEWAY) {
+ dst = (struct sockaddr_in *)(void *)
+ ro->ro_rt->rt_gateway;
+ }
+ if (ro->ro_rt->rt_flags & RTF_HOST) {
isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST);
- else
+ } else {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro->ro_rt);
isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ }
+ RT_UNLOCK(ro->ro_rt);
}
- if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
+
+ if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) {
struct in_multi *inm;
+ u_int32_t vif;
+ 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 = (struct sockaddr_in *)(void *)&ro->ro_dst;
/*
* See if the caller provided any multicast options
*/
if (imo != NULL) {
- if ((flags & IP_RAWOUTPUT) == 0) 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) == 0)
+ ip->ip_ttl = ttl;
+ if (imo->imo_multicast_ifp != NULL)
ifp = imo->imo_multicast_ifp;
- }
- if (imo->imo_multicast_vif != -1 &&
- ((flags & IP_RAWOUTPUT) == 0 || ip->ip_src.s_addr == INADDR_ANY))
- ip->ip_src.s_addr =
- ip_mcast_src(imo->imo_multicast_vif);
- } else
- if ((flags & IP_RAWOUTPUT) == 0) ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
+ IMO_UNLOCK(imo);
+#if MROUTING
+ if (vif != -1 && ((flags & IP_RAWOUTPUT) == 0 ||
+ ip->ip_src.s_addr == INADDR_ANY))
+ ip->ip_src.s_addr = ip_mcast_src(vif);
+#endif /* MROUTING */
+ } else if ((flags & IP_RAWOUTPUT) == 0) {
+ vif = -1;
+ ip->ip_ttl = ttl;
+ }
/*
* Confirm that the outgoing interface supports multicast.
*/
- if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
+ if (imo == NULL || vif == -1) {
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
- ipstat.ips_noroute++;
+ 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;
-
+ 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.
*/
+ if (!TAILQ_EMPTY(&ipv4_filters)) {
+ struct ipfilter *filter;
+ int seen = (inject_filter_ref == 0);
+
+ 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();
+
+ /* 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();
+ 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();
+ didfilter = 1;
+ }
ip_mloopback(ifp, m, dst, hlen);
}
+#if MROUTING
else {
/*
* If we are acting as a multicast router, perform
* as prescribed by rsvpd.
*/
if (!rsvp_on)
- imo = NULL;
+ imo = NULL;
if (ip_mforward(ip, ifp, m, imo) != 0) {
m_freem(m);
+ if (inm != NULL)
+ INM_REMREF(inm);
+ OSAddAtomic(1, &ipstat.ips_cantforward);
goto done;
}
}
}
-
+#endif /* MROUTING */
+ 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
* the next-hop, our interface may change, changing the
fwd_rewrite_src++;
#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
}
sendit:
+#if PF
+ /* Invoke outbound packet filter */
+ if (PF_IS_ENABLED) {
+ int rc;
+
+ 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
*/
ip_linklocal_stat.iplls_out_total++;
if (ip->ip_ttl != MAXTTL) {
ip_linklocal_stat.iplls_out_badttl++;
- ip->ip_ttl = MAXTTL;
+ ip->ip_ttl = MAXTTL;
}
}
+ if (!didfilter && !TAILQ_EMPTY(&ipv4_filters)) {
+ struct ipfilter *filter;
+ int seen = (inject_filter_ref == 0);
+ 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 IPSEC
/* temporary for testing only: bypass ipsec alltogether */
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
+
/* get SP for this packet */
if (so == NULL)
sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
if (sp == NULL) {
- ipsecstat.out_inval++;
+ IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 0,0,0,0,0);
goto bad;
}
/* 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;
/* 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 */
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));
+ bzero(&ipsec_state.ro, sizeof(ipsec_state.ro));
} else
- state.ro = ro;
- state.dst = (struct sockaddr *)dst;
+ route_copyout(&ipsec_state.ro, ro, sizeof(ipsec_state.ro));
+ ipsec_state.dst = (struct sockaddr *)dst;
ip->ip_sum = 0;
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
+
+#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
+#endif
- error = ipsec4_output(&state, sp, flags);
+ 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);
+
+ m0 = m = ipsec_state.m;
- m0 = 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;
+ ipsec_saved_route = ro;
+ ro = &ipsec_state.ro;
}
- } else
- ro = state.ro;
-
- dst = (struct sockaddr_in *)state.dst;
+ } else {
+ ipsec_saved_route = ro;
+ ro = &ipsec_state.ro;
+ }
+ dst = (struct sockaddr_in *)(void *)ipsec_state.dst;
if (error) {
/* mbuf is already reclaimed in ipsec4_output. */
m0 = NULL;
/* 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
hlen = ip->ip_hl << 2;
#endif
/* Check that there wasn't a route change and src is still valid */
-
- if (ro->ro_rt->generation_id != route_generation) {
- if (ifa_foraddr(ip->ip_src.s_addr) == NULL && ((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0)) {
- error = EADDRNOTAVAIL;
- KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 5,0,0,0,0);
+ if (ro->ro_rt != NULL && ro->ro_rt->generation_id != route_generation) {
+ if ((src_ia = ifa_foraddr(ip->ip_src.s_addr)) == NULL &&
+ ((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0)) {
+ error = EADDRNOTAVAIL;
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 5,0,0,0,0);
goto bad;
}
rtfree(ro->ro_rt);
ro->ro_rt = NULL;
+ if (src_ia != NULL)
+ IFA_REMREF(&src_ia->ia_ifa);
}
if (ro->ro_rt == NULL) {
if ((flags & IP_ROUTETOIF) == 0) {
- printf("ip_output: "
- "can't update route after IPsec processing\n");
- error = EHOSTUNREACH; /*XXX*/
- KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 6,0,0,0,0);
+ printf("ip_output: can't update route after "
+ "IPsec processing\n");
+ error = EHOSTUNREACH; /*XXX*/
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END,
+ 6,0,0,0,0);
goto bad;
}
} else {
+ if (ia)
+ IFA_REMREF(&ia->ia_ifa);
+ RT_LOCK_SPIN(ro->ro_rt);
ia = ifatoia(ro->ro_rt->rt_ifa);
+ if (ia) {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro->ro_rt);
+ IFA_ADDREF(&ia->ia_ifa);
+ }
ifp = ro->ro_rt->rt_ifp;
+ RT_UNLOCK(ro->ro_rt);
}
/* make it flipped, again. */
+
+#if BYTE_ORDER != BIG_ENDIAN
NTOHS(ip->ip_len);
NTOHS(ip->ip_off);
+#endif
+
KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 7,0xff,0xff,0xff,0xff);
-skip_ipsec:
-#endif /*IPSEC*/
- /*
- * 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(m0 = 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);
+ args.fwa_m = m;
+ args.fwa_next_hop = dst;
+ args.fwa_oif = ifp;
+ off = 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)
goto done ;
}
ip = mtod(m, struct ip *);
- if (off == 0 && dst == old) /* common case */
+
+ if (off == 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 && (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!
+ */
+ 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, off & 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) {
struct mbuf *clone = NULL;
}
/* 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, off & 0xffff, args.fwa_divert_rule);
/* If 'tee', continue with original packet */
if (clone != NULL) {
* And I'm babbling.
*/
if (off == 0 && old != dst) {
- struct in_ifaddr *ia;
+ struct in_ifaddr *ia_fw;
/* It's changed... */
/* There must be a better way to do this next line... */
* 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;
+ 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;
+ }
+
+ 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 = ifunit("lo0");
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ m->m_pkthdr.rcvif = lo_ifp;
+ if ((~IF_HWASSIST_CSUM_FLAGS(m->m_pkthdr.rcvif->if_hwassist) &
+ m->m_pkthdr.csum_flags) == 0) {
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ m->m_pkthdr.csum_flags |=
+ CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
+ m->m_pkthdr.csum_data = 0xffff;
+ }
m->m_pkthdr.csum_flags |=
- CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
- m->m_pkthdr.csum_data = 0xffff;
+ CSUM_IP_CHECKED | CSUM_IP_VALID;
+ }
+ else if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ ip->ip_sum = in_cksum(m, hlen);
}
- m->m_pkthdr.csum_flags |=
- CSUM_IP_CHECKED | CSUM_IP_VALID;
+
+#if BYTE_ORDER != BIG_ENDIAN
HTONS(ip->ip_len);
HTONS(ip->ip_off);
- ip_input(m);
+#endif
+
+ /* 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, 0,
+ (struct sockaddr *)dst, 0, adv);
+ }
+ else {
+ printf("ip_output: no loopback ifp for forwarding!!!\n");
+ }
goto done;
}
/* Some of the logic for this was
*/
bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
- ro_fwd->ro_rt = 0;
+ ro_fwd->ro_rt = NULL;
rtalloc_ign(ro_fwd, RTF_PRCLONING);
- 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;
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)
+ dst = (struct sockaddr_in *)(void *)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
+ } else {
+ /* Become a regular mutex */
+ RT_CONVERT_LOCK(ro_fwd->ro_rt);
isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ }
+ RT_UNLOCK(ro_fwd->ro_rt);
rtfree(ro->ro_rt);
ro->ro_rt = ro_fwd->ro_rt;
- dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
+ dst = (struct sockaddr_in *)(void *)&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;
+ if (ia_fw != NULL) {
+ if (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 */
* 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:
+#endif /* IPFIREWALL */
#if __APPLE__
/* Do not allow loopback address to wind up on a wire */
if ((ifp->if_flags & IFF_LOOPBACK) == 0 &&
((ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
(ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)) {
- ipstat.ips_badaddr++;
+ OSAddAtomic(1, &ipstat.ips_badaddr);
m_freem(m);
- /*
- * Simply drop the packet just like a firewall -- we do not want the
- * the application to feel the pain, not yet...
- * Returning ENETUNREACH like ip6_output does in some similar cases
- * could startle the otherwise clueless process that specifies
+ /*
+ * Do not simply drop the packet just like a firewall -- we want the
+ * the application to feel the pain.
+ * Return ENETUNREACH like ip6_output does in some similar cases.
+ * This can startle the otherwise clueless process that specifies
* loopback as the source address.
*/
+ error = ENETUNREACH;
goto done;
}
#endif
m->m_pkthdr.csum_flags |= CSUM_IP;
+ tso = (ifp->if_hwassist & IFNET_TSO_IPV4) && (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4);
+
sw_csum = m->m_pkthdr.csum_flags
& ~IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
/* 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_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 {
+ 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);
}
+ } else if (apple_hwcksum_tx == 0) {
+ sw_csum |= (CSUM_DELAY_DATA | CSUM_DELAY_IP) &
+ m->m_pkthdr.csum_flags;
}
-
+
if (sw_csum & CSUM_DELAY_DATA) {
in_delayed_cksum(m);
sw_csum &= ~CSUM_DELAY_DATA;
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
}
-
- m->m_pkthdr.csum_flags &= IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
+
+ if (apple_hwcksum_tx != 0) {
+ m->m_pkthdr.csum_flags &=
+ IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
+ } else {
+ m->m_pkthdr.csum_flags = 0;
+ }
/*
* 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 ||
+ if ((u_short)ip->ip_len <= ifp->if_mtu || tso ||
ifp->if_hwassist & CSUM_FRAGMENT) {
+ if (tso)
+ m->m_pkthdr.csum_flags |= CSUM_TSO_IPV4;
+
+
+#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) {
if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0)
ipsec_delaux(m);
#endif
-#if __APPLE__
- error = dlil_output(ifptodlt(ifp, PF_INET), 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;
+ if (packetchain == 0) {
+ if (ro->ro_rt && nstat_collect)
+ nstat_route_tx(ro->ro_rt, 1, m->m_pkthdr.len, 0);
+ error = dlil_output(ifp, PF_INET, m, ro->ro_rt,
+ (struct sockaddr *)dst, 0, adv);
+ 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 && nstat_collect)
+ nstat_route_tx(ro->ro_rt, pktcnt, bytecnt, 0);
+ //send
+ error = dlil_output(ifp, PF_INET, packetlist,
+ ro->ro_rt, (struct sockaddr *)dst, 0, adv);
+ pktcnt = 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.
*/
- if (ip->ip_off & IP_DF) {
+
+ if (ip->ip_off & IP_DF || (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) ||
+ pktcnt > 0) {
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);
+ }
+ if (pktcnt > 0) {
+ m0 = packetlist;
}
- ipstat.ips_cantfrag++;
+ 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) == 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 ((packetchain != 0) && (pktcnt > 0))
+ panic("ip_output: mix of packet in packetlist is wrong=%p", packetlist);
+ if (ro->ro_rt && nstat_collect)
+ nstat_route_tx(ro->ro_rt, 1, m->m_pkthdr.len, 0);
+ error = dlil_output(ifp, PF_INET, m, ro->ro_rt,
+ (struct sockaddr *)dst, 0, adv);
+ } else
+ m_freem(m);
+ }
+
+ if (error == 0)
+ OSAddAtomic(1, &ipstat.ips_fragmented);
+
+done:
+ if (ia) {
+ IFA_REMREF(&ia->ia_ifa);
+ ia = NULL;
+ }
+#if IPSEC
+ if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
+ if (ipsec_state.ro.ro_rt)
+ rtfree(ipsec_state.ro.ro_rt);
+ 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 */
+
+ KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error,0,0,0,0);
+ return (error);
+bad:
+ m_freem(m0);
+ goto done;
+}
+
+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
+ hlen = ip->ip_hl << 2;
+#endif
+
+ 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) {
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,
* make new header and copy data of each part and link onto chain.
m0 = m;
mhlen = sizeof (struct ip);
for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
- MGETHDR(m, M_DONTWAIT, MT_HEADER);
+ MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */
if (m == 0) {
error = ENOBUFS;
- ipstat.ips_odropped++;
+ OSAddAtomic(1, &ipstat.ips_odropped);
goto sendorfree;
}
m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
if (m->m_next == 0) {
(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 = 0;
m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
+ m->m_pkthdr.socket_id = m0->m_pkthdr.socket_id;
+
+ M_COPY_PFTAG(m, m0);
+ m_set_service_class(m, m0->m_pkthdr.svc);
+
+#if CONFIG_MACF_NET
+ mac_netinet_fragment(m0, m);
+#endif
+
+#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);
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);
+#endif
+
ip->ip_sum = 0;
if (sw_csum & CSUM_DELAY_IP) {
ip->ip_sum = in_cksum(m, hlen);
}
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 && (flags & IP_NOIPSEC) == 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(ifptodlt(ifp, PF_INET), m, (void *) ro->ro_rt,
- (struct sockaddr *)dst, 0);
-#else
- error = (*ifp->if_output)(ifp, m,
- (struct sockaddr *)dst, ro->ro_rt);
+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;
+ }
+}
+
+void
+in_delayed_cksum_offset(struct mbuf *m0, int ip_offset)
+{
+ struct ip *ip;
+ unsigned char buf[sizeof(struct ip)];
+ u_short csum, offset, ip_len;
+
+ /* Save copy of first mbuf pointer and the ip_offset before modifying */
+ struct mbuf *m = m0;
+ int ip_offset_copy = ip_offset;
+
+ while (ip_offset >= m->m_len) {
+ ip_offset -= m->m_len;
+ m = m->m_next;
+ if (m == NULL) {
+ printf("in_delayed_cksum_withoffset failed - "
+ "ip_offset wasn't in the packet\n");
+ return;
+ }
+ }
+
+ /*
+ * In case the IP header is not contiguous, or not 32-bit
+ * aligned, copy it to a local buffer.
+ */
+ if ((ip_offset + sizeof(struct ip) > m->m_len) ||
+ !IP_HDR_ALIGNED_P(mtod(m, caddr_t) + ip_offset)) {
+#if DEBUG
+ printf("delayed m_pullup, m->len: %d off: %d\n",
+ m->m_len, ip_offset);
#endif
- } else
- m_freem(m);
+ m_copydata(m, ip_offset, sizeof(struct ip), (caddr_t) buf);
+
+ ip = (struct ip *)(void *)buf;
+ } else {
+ ip = (struct ip*)(void *)(m->m_data + ip_offset);
}
- if (error == 0)
- ipstat.ips_fragmented++;
- }
-done:
-#if IPSEC
- if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
- if (ro == &iproute && ro->ro_rt) {
- rtfree(ro->ro_rt);
- ro->ro_rt = NULL;
+ /* Gross */
+ if (ip_offset) {
+ m->m_len -= ip_offset;
+ m->m_data += ip_offset;
}
- if (sp != NULL) {
- KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ip_output call free SP:%x\n", sp));
- key_freesp(sp);
+
+ offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
+
+ /*
+ * 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, then the packet
+ * is bogus and we give up.
+ */
+ ip_len = ip->ip_len;
+ if (ip_len != (m0->m_pkthdr.len - ip_offset_copy)) {
+ ip_len = SWAP16(ip_len);
+ if (ip_len != (m0->m_pkthdr.len - ip_offset_copy)) {
+ printf("in_delayed_cksum_offset: ip_len %d (%d) "
+ "doesn't match actual length %d\n", ip->ip_len,
+ ip_len, (m0->m_pkthdr.len - ip_offset_copy));
+ return;
+ }
}
+
+ csum = in_cksum_skip(m, ip_len, offset);
+
+ /* Update stats */
+ ip_out_cksum_stats(ip->ip_p, ip_len - offset);
+
+ if (m0->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
+ csum = 0xffff;
+ offset += m0->m_pkthdr.csum_data & 0xFFFF; /* checksum offset */
+
+ /* Gross */
+ if (ip_offset) {
+ if (M_LEADINGSPACE(m) < ip_offset)
+ panic("in_delayed_cksum_offset - chain modified!\n");
+ m->m_len += ip_offset;
+ m->m_data -= ip_offset;
}
-#endif /* IPSEC */
- KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error,0,0,0,0);
- return (error);
-bad:
- m_freem(m0);
- goto done;
+ if (offset > ip_len) /* bogus offset */
+ return;
+
+ /* Insert the checksum in the existing chain */
+ if (offset + ip_offset + sizeof(u_short) > m->m_len) {
+ char tmp[2];
+
+#if DEBUG
+ printf("delayed m_copyback, m->len: %d off: %d p: %d\n",
+ m->m_len, offset + ip_offset, ip->ip_p);
+#endif
+ *(u_short *)(void *)tmp = csum;
+ m_copyback(m, offset + ip_offset, 2, tmp);
+ } else if (IP_HDR_ALIGNED_P(mtod(m, caddr_t) + ip_offset)) {
+ *(u_short *)(void *)(m->m_data + offset + ip_offset) = csum;
+ } else {
+ bcopy(&csum, (m->m_data + offset + ip_offset), sizeof (csum));
+ }
}
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 */
-
- if (offset > ip->ip_len) /* bogus offset */
- return;
+ in_delayed_cksum_offset(m, 0);
+}
- 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.
- */
- m = m_pullup(m, offset + sizeof(u_short));
+void
+in_cksum_offset(struct mbuf* m, size_t ip_offset)
+{
+ struct ip* ip = NULL;
+ int hlen = 0;
+ unsigned char buf[sizeof(struct ip)];
+ int swapped = 0;
+
+ /* Save copy of first mbuf pointer and the ip_offset before modifying */
+ struct mbuf* m0 = m;
+ size_t ip_offset_copy = ip_offset;
+
+ while (ip_offset >= m->m_len) {
+ ip_offset -= m->m_len;
+ m = m->m_next;
+ if (m == NULL) {
+ printf("in_cksum_offset failed - ip_offset wasn't "
+ "in the packet\n");
+ return;
+ }
}
- *(u_short *)(m->m_data + offset) = csum;
-}
-/*
- * Insert IP options into preformed packet.
+ /*
+ * In case the IP header is not contiguous, or not 32-bit
+ * aligned, copy it to a local buffer.
+ */
+ if ((ip_offset + sizeof(struct ip) > m->m_len) ||
+ !IP_HDR_ALIGNED_P(mtod(m, caddr_t) + ip_offset)) {
+#if DEBUG
+ printf("in_cksum_offset - delayed m_pullup, m->len: %d "
+ "off: %lu\n", m->m_len, ip_offset);
+#endif
+ m_copydata(m, ip_offset, sizeof(struct ip), (caddr_t) buf);
+
+ ip = (struct ip *)(void *)buf;
+ ip->ip_sum = 0;
+ m_copyback(m, ip_offset + offsetof(struct ip, ip_sum), 2,
+ (caddr_t)&ip->ip_sum);
+ } else {
+ ip = (struct ip*)(void *)(m->m_data + ip_offset);
+ ip->ip_sum = 0;
+ }
+
+ /* Gross */
+ if (ip_offset) {
+ m->m_len -= ip_offset;
+ m->m_data += ip_offset;
+ }
+
+#ifdef _IP_VHL
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+#else
+ hlen = ip->ip_hl << 2;
+#endif
+ /*
+ * We could be in the context of an IP or interface filter; in the
+ * former case, ip_len would be in host order while for the latter
+ * it would be in network (correct) 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, then the packet
+ * is bogus and we give up.
+ */
+ if (ntohs(ip->ip_len) != (m0->m_pkthdr.len - ip_offset_copy)) {
+ ip->ip_len = SWAP16(ip->ip_len);
+ swapped = 1;
+ if (ntohs(ip->ip_len) != (m0->m_pkthdr.len - ip_offset_copy)) {
+ ip->ip_len = SWAP16(ip->ip_len);
+ printf("in_cksum_offset: ip_len %d (%d) "
+ "doesn't match actual length %lu\n",
+ ip->ip_len, SWAP16(ip->ip_len),
+ (m0->m_pkthdr.len - ip_offset_copy));
+ return;
+ }
+ }
+
+ ip->ip_sum = 0;
+ ip->ip_sum = in_cksum(m, hlen);
+ if (swapped)
+ ip->ip_len = SWAP16(ip->ip_len);
+
+ /* Gross */
+ if (ip_offset) {
+ if (M_LEADINGSPACE(m) < ip_offset)
+ panic("in_cksum_offset - chain modified!\n");
+ m->m_len += ip_offset;
+ m->m_data -= ip_offset;
+ }
+
+ /*
+ * Insert the checksum in the existing chain if IP header not
+ * contiguous, or if it's not 32-bit aligned, i.e. all the cases
+ * where it was copied to a local buffer.
+ */
+ if (ip_offset + sizeof(struct ip) > m->m_len) {
+ char tmp[2];
+
+#if DEBUG
+ printf("in_cksum_offset m_copyback, m->len: %u off: %lu "
+ "p: %d\n", m->m_len,
+ ip_offset + offsetof(struct ip, ip_sum), ip->ip_p);
+#endif
+ *(u_short *)(void *)tmp = ip->ip_sum;
+ m_copyback(m, ip_offset + offsetof(struct ip, ip_sum), 2, tmp);
+ } else if (!IP_HDR_ALIGNED_P(mtod(m, caddr_t) + ip_offset)) {
+ bcopy(&ip->ip_sum,
+ (m->m_data + ip_offset + offsetof(struct ip, ip_sum)),
+ sizeof (u_short));
+ }
+}
+
+/*
+ * Insert IP options into preformed packet.
* Adjust IP destination as required for IP source routing,
* as indicated by a non-zero in_addr at the start of the options.
*
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);
+ MGETHDR(n, M_DONTWAIT, MT_HEADER); /* MAC-OK */
if (n == 0)
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
n->m_pkthdr.len = m->m_pkthdr.len + optlen;
m->m_len -= sizeof(struct ip);
m->m_data += sizeof(struct ip);
error = EMSGSIZE;
break;
}
- MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER);
+ MGET(m, sopt->sopt_p != kernproc ? M_WAIT : M_DONTWAIT,
+ MT_HEADER);
if (m == 0) {
error = ENOBUFS;
break;
case IP_RECVDSTADDR:
case IP_RECVIF:
case IP_RECVTTL:
-#if defined(NFAITH) && NFAITH > 0
- case IP_FAITH:
-#endif
+ case IP_RECVPKTINFO:
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
OPTSET(INP_RECVTTL);
break;
-#if defined(NFAITH) && NFAITH > 0
- case IP_FAITH:
- OPTSET(INP_FAITH);
+ case IP_RECVPKTINFO:
+ OPTSET(INP_PKTINFO);
break;
-#endif
}
break;
#undef OPTSET
+#if CONFIG_FORCE_OUT_IFP
+ /*
+ * Apple private interface, similar to IP_BOUND_IF, except
+ * that the parameter is a NULL-terminated string containing
+ * the name of the network interface; an emptry string means
+ * unbind. Applications are encouraged to use IP_BOUND_IF
+ * instead, as that is the current "official" API.
+ */
+ case IP_FORCE_OUT_IFP: {
+ char ifname[IFNAMSIZ];
+ unsigned int ifscope;
+
+ /* This option is settable only for IPv4 */
+ if (!(inp->inp_vflag & INP_IPV4)) {
+ error = EINVAL;
+ break;
+ }
+
+ /* Verify interface name parameter is sane */
+ if (sopt->sopt_valsize > sizeof(ifname)) {
+ error = EINVAL;
+ break;
+ }
+
+ /* Copy the interface name */
+ if (sopt->sopt_valsize != 0) {
+ error = sooptcopyin(sopt, ifname,
+ sizeof (ifname), sopt->sopt_valsize);
+ if (error)
+ break;
+ }
+
+ if (sopt->sopt_valsize == 0 || ifname[0] == '\0') {
+ /* Unbind this socket from any interface */
+ ifscope = IFSCOPE_NONE;
+ } else {
+ ifnet_t ifp;
+
+ /* Verify name is NULL terminated */
+ if (ifname[sopt->sopt_valsize - 1] != '\0') {
+ error = EINVAL;
+ break;
+ }
+
+ /* Bail out if given bogus interface name */
+ if (ifnet_find_by_name(ifname, &ifp) != 0) {
+ error = ENXIO;
+ break;
+ }
+
+ /* Bind this socket to this interface */
+ ifscope = ifp->if_index;
+
+ /*
+ * Won't actually free; since we don't release
+ * this later, we should do it now.
+ */
+ ifnet_release(ifp);
+ }
+ error = inp_bindif(inp, ifscope);
+ }
+ break;
+#endif
+ /*
+ * 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:
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;
}
#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);
+ 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;
+
+ error = inp_nocellular(inp, optval);
+ break;
+
+ case IP_OUT_IF:
+ /* This option is not settable */
+ error = EINVAL;
+ break;
+
default:
error = ENOPROTOOPT;
break;
case IP_RECVIF:
case IP_RECVTTL:
case IP_PORTRANGE:
-#if defined(NFAITH) && NFAITH > 0
- case IP_FAITH:
-#endif
+ case IP_RECVPKTINFO:
switch (sopt->sopt_name) {
case IP_TOS:
optval = 0;
break;
-#if defined(NFAITH) && NFAITH > 0
- case IP_FAITH:
- optval = OPTBIT(INP_FAITH);
+ case IP_RECVPKTINFO:
+ optval = OPTBIT(INP_PKTINFO);
break;
-#endif
}
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
}
#endif /*IPSEC*/
+#if TRAFFIC_MGT
+ case IP_TRAFFIC_MGT_BACKGROUND:
+ {
+ unsigned background = (so->so_traffic_mgt_flags & TRAFFIC_MGT_SO_BACKGROUND);
+ return (sooptcopyout(sopt, &background, sizeof(background)));
+ break;
+ }
+#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->inp_flags & INP_NO_IFT_CELLULAR) ? 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;
break;
* with destination address if source routed.
*/
static int
-ip_pcbopts(optname, pcbopt, m)
- int optname;
- struct mbuf **pcbopt;
- register struct mbuf *m;
+ip_pcbopts(
+ __unused int optname,
+ struct mbuf **pcbopt,
+ register struct mbuf *m)
{
register int cnt, optlen;
register u_char *cp;
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).
- */
-
-/*
- * 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;
+void
+ip_moptions_init(void)
{
- int ifindex;
- struct ifnet *ifp;
+ PE_parse_boot_argn("ifa_debug", &imo_debug, sizeof (imo_debug));
- 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;
- } else {
- INADDR_TO_IFP(*a, ifp);
+ 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 */
}
- return ifp;
+ zone_change(imo_zone, Z_EXPAND, TRUE);
}
-/*
- * Set the IP multicast options in response to user setsockopt().
- */
-static int
-ip_setmoptions(sopt, imop)
- struct sockopt *sopt;
- struct ip_moptions **imop;
+void
+imo_addref(struct ip_moptions *imo, int locked)
{
- int error = 0;
- int i;
- struct in_addr addr;
- struct ip_mreq mreq;
- struct ifnet *ifp = NULL;
- struct ip_moptions *imo = *imop;
- int ifindex;
- int s;
+ if (!locked)
+ IMO_LOCK(imo);
+ else
+ IMO_LOCK_ASSERT_HELD(imo);
- if (imo == NULL) {
- /*
- * No multicast option buffer attached to the pcb;
- * allocate one and initialize to default values.
- */
- error = ip_createmoptions(imop);
- if (error != 0)
- return error;
- imo = *imop;
+ 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);
}
- 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;
-
- 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;
-
- 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)
- break;
- if (ttl > 255)
- error = EINVAL;
- else
- imo->imo_multicast_ttl = ttl;
- }
- break;
-
- 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 (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;
- }
- 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;
-
- error = ip_addmembership(imo, &mreq);
- break;
+ if (!locked)
+ IMO_UNLOCK(imo);
+}
- case IP_DROP_MEMBERSHIP:
- /*
- * Drop a multicast group membership.
- * Group must be a valid IP multicast address.
- */
- error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
- if (error)
- break;
-
- error = ip_dropmembership(imo, &mreq);
- break;
+void
+imo_remref(struct ip_moptions *imo)
+{
+ int i;
- default:
- error = EOPNOTSUPP;
- break;
+ 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);
}
- /*
- * If all options have default values, no need to keep the mbuf.
- */
- 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;
+ --imo->imo_refcnt;
+ if (imo->imo_refcnt > 0) {
+ IMO_UNLOCK(imo);
+ return;
}
- return (error);
-}
+ for (i = 0; i < imo->imo_num_memberships; ++i) {
+ struct in_mfilter *imf;
-/*
- * Set the IP multicast options in response to user setsockopt().
- */
-__private_extern__ int
-ip_createmoptions(
- struct ip_moptions **imop)
-{
- struct ip_moptions *imo;
- 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;
-
- return 0;
-}
+ imf = imo->imo_mfilters ? &imo->imo_mfilters[i] : NULL;
+ if (imf != NULL)
+ imf_leave(imf);
-/*
- * Add membership to an IPv4 multicast.
- */
-__private_extern__ int
-ip_addmembership(
- struct ip_moptions *imo,
- struct ip_mreq *mreq)
-{
- struct route ro;
- struct sockaddr_in *dst;
- struct ifnet *ifp = NULL;
- int error = 0;
- int s = 0;
- int i;
-
- if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
- error = EINVAL;
- return error;
- }
- 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 (ifp == NULL) {
- ifp = ip_multicast_if(&mreq->imr_interface, NULL);
- }
+ (void) in_leavegroup(imo->imo_membership[i], imf);
- /*
- * 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);
- return error;
- }
- /*
- * 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 (imf != NULL)
+ imf_purge(imf);
+
+ INM_REMREF(imo->imo_membership[i]);
+ imo->imo_membership[i] = NULL;
}
- if (i < imo->imo_num_memberships) {
- error = EADDRINUSE;
- splx(s);
- return error;
+ imo->imo_num_memberships = 0;
+ if (imo->imo_mfilters != NULL) {
+ FREE(imo->imo_mfilters, M_INMFILTER);
+ imo->imo_mfilters = NULL;
}
- if (i == IP_MAX_MEMBERSHIPS) {
- error = ETOOMANYREFS;
- splx(s);
- return error;
+ if (imo->imo_membership != NULL) {
+ FREE(imo->imo_membership, M_IPMOPTS);
+ imo->imo_membership = NULL;
}
- /*
- * 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);
- return error;
- }
- ++imo->imo_num_memberships;
- splx(s);
-
- return error;
-}
+ IMO_UNLOCK(imo);
-/*
- * Drop membership of an IPv4 multicast.
- */
-__private_extern__ int
-ip_dropmembership(
- struct ip_moptions *imo,
- struct ip_mreq *mreq)
-{
- int error = 0;
- int s = 0;
- struct ifnet* ifp = NULL;
- int i;
-
- if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
- error = EINVAL;
- return error;
- }
+ lck_mtx_destroy(&imo->imo_lock, ifa_mtx_grp);
- 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);
- return error;
- }
- }
- /*
- * 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 (!(imo->imo_debug & IFD_ALLOC)) {
+ panic("%s: imo %p cannot be freed", __func__, imo);
+ /* NOTREACHED */
}
- if (i == imo->imo_num_memberships) {
- error = EADDRNOTAVAIL;
- splx(s);
- return error;
- }
- /*
- * Give up the multicast address record to which the
- * membership points.
- */
- in_delmulti(imo->imo_membership[i]);
- /*
- * Remove the gap in the membership array.
- */
- for (++i; i < imo->imo_num_memberships; ++i)
- imo->imo_membership[i-1] = imo->imo_membership[i];
- --imo->imo_num_memberships;
- splx(s);
-
- return error;
+ zfree(imo_zone, imo);
}
-/*
- * Return the IP multicast options in response to user getsockopt().
- */
-static int
-ip_getmoptions(sopt, imo)
- struct sockopt *sopt;
- register struct ip_moptions *imo;
+static void
+imo_trace(struct ip_moptions *imo, int refhold)
{
- struct in_addr addr;
- struct in_ifaddr *ia;
- int error, optval;
- u_char coptval;
-
- 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;
-
- 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;
- } else {
- IFP_TO_IA(imo->imo_multicast_ifp, ia);
- addr.s_addr = (ia == NULL) ? INADDR_ANY
- : IA_SIN(ia)->sin_addr.s_addr;
- }
- 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;
+ 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 */
}
- return (error);
+ if (refhold) {
+ cnt = &imo_dbg->imo_refhold_cnt;
+ tr = imo_dbg->imo_refhold;
+ } else {
+ 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]);
}
-/*
- * Discard the IP multicast options.
- */
-void
-ip_freemoptions(imo)
- register struct ip_moptions *imo;
+struct ip_moptions *
+ip_allocmoptions(int how)
{
- register int i;
+ struct ip_moptions *imo;
+ imo = (how == M_WAITOK) ? zalloc(imo_zone) : zalloc_noblock(imo_zone);
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);
+ 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 (imo);
}
/*
{
register struct ip *ip;
struct mbuf *copym;
+ int sw_csum = (apple_hwcksum_tx == 0);
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 (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 = 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;
- }
+ if (dst->sin_family != AF_INET) {
+ printf("ip_mloopback: bad address family %d\n",
+ dst->sin_family);
+ dst->sin_family = AF_INET;
+ }
#endif
-
/*
- * 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 (IF_HWASSIST_CSUM_FLAGS(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);
- }
+ * 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 (sw_csum || (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA)) {
+ if (!sw_csum && IF_HWASSIST_CSUM_FLAGS(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 {
+
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(ip->ip_len);
+#endif
+
+ in_delayed_cksum(copym);
+
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+#endif
+
+ }
}
+ /*
+ * TedW:
+ * We need to send all loopback traffic down to dlil in case
+ * a filter has tapped-in.
+ */
+
+ /*
+ * 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_ifp) {
+ copym->m_pkthdr.rcvif = ifp;
+ dlil_output(lo_ifp, PF_INET, copym, 0,
+ (struct sockaddr *) dst, 0, NULL);
+ } else {
+ printf("Warning: ip_output call to dlil_find_dltag failed!\n");
+ m_freem(copym);
+ }
+}
+
+/*
+ * 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];
+
+ 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;
/*
- * TedW:
- * We need to send all loopback traffic down to dlil in case
- * a filter has tapped-in.
+ * 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 (scope == IFSCOPE_NONE) {
+ scope = rt_ifp->if_index;
+ if (scope != get_primary_ifscope(AF_INET) &&
+ ro->ro_rt->generation_id != route_generation)
+ scope = get_primary_ifscope(AF_INET);
+ }
- if (lo_dl_tag == 0)
- dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dl_tag);
+ ifa = (struct ifaddr *)ifa_foraddr_scoped(src.s_addr, scope);
+
+ 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 (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));
+ }
+ }
+ }
+
+ /*
+ * 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);
/*
- * 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 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.
*/
- 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);
+ 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, (struct sockaddr *)&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 (oifa != NULL) {
+ struct ifaddr *iifa;
+
+ /*
+ * 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);
}
-/* if_simloop(ifp, copym, (struct sockaddr *)dst, 0);*/
+ 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 (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);
+ rtfree(ro->ro_rt);
+ ro->ro_rt = NULL;
+ ro->ro_flags &= ~ROF_SRCIF_SELECTED;
+
+ /*
+ * 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.
+ */
+ if (IN_LINKLOCAL(ntohl(dst.s_addr)) &&
+ !IN_LINKLOCAL(ntohl(src.s_addr)) && ifa != NULL) {
+ IFA_REMREF(ifa);
+ ifa = NULL;
+ }
+ }
+
+ 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 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 (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))) {
+ ro->ro_flags |= ROF_SRCIF_SELECTED;
+ ro->ro_rt->generation_id = route_generation;
+ }
+
+ if (ro->ro_rt != NULL)
+ RT_UNLOCK(ro->ro_rt);
+
+ return (ifa);
}
projects / apple / xnu.git / blobdiff