/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2008 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
* SUCH DAMAGE.
*
* @(#)ip_output.c 8.3 (Berkeley) 1/21/94
+ * $FreeBSD: src/sys/netinet/ip_output.c,v 1.99.2.16 2001/07/19 06:37:26 kris Exp $
+ */
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
*/
#define _IP_VHL
-#if ISFB31
-#include "opt_ipfw.h"
-#include "opt_ipdn.h"
-#include "opt_ipdivert.h"
-#include "opt_ipfilter.h"
-#endif
-
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
+#include <kern/locks.h>
+#include <sys/sysctl.h>
+
+#include <machine/endian.h>
#include <net/if.h>
+#include <net/if_dl.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
-#if INET6
-#include <netinet/ip6.h>
-#include <netinet6/ip6_var.h>
-#endif
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
-#include <net/dlil.h>
+#include <netinet/kpi_ipfilter_var.h>
+
+#if CONFIG_MACF_NET
+#include <security/mac_framework.h>
+#endif
+
+#include "faith.h"
+
+#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)
-
-#ifdef vax
-#include <machine/mtpr.h>
-#endif
-
-#if ISFB31
-#include <machine/in_cksum.h>
-
-static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
-#endif
-
-//static MALLOC_DEFINE(M_IPMOPTS, "ip_moptions", "internet multicast options");
+#define SWAP16(v) ((((v) & 0xff) << 8) | ((v) >> 8))
#if IPSEC
#include <netinet6/ipsec.h>
#include <netkey/key.h>
+#if IPSEC_DEBUG
#include <netkey/key_debug.h>
-
-#endif /*IPSEC*/
-
-#if !defined(COMPAT_IPFW) || COMPAT_IPFW == 1
-#undef COMPAT_IPFW
-#define COMPAT_IPFW 1
#else
-#undef COMPAT_IPFW
+#define KEYDEBUG(lev,arg)
#endif
+#endif /*IPSEC*/
-#if COMPAT_IPFW
#include <netinet/ip_fw.h>
-#endif
+#include <netinet/ip_divert.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,\
(ntohl(a.s_addr))&0xFF);
#endif
+
u_short ip_id;
-static struct mbuf *ip_insertoptions __P((struct mbuf *, struct mbuf *, 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 **));
-static u_long lo_dl_tag = 0;
-static int ip_optcopy __P((struct ip *, struct ip *));
+static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *);
+static struct ifnet *ip_multicast_if(struct in_addr *, int *);
+static void ip_mloopback(struct ifnet *, struct mbuf *,
+ struct sockaddr_in *, int);
+static int ip_getmoptions(struct sockopt *, struct ip_moptions *);
+static int ip_pcbopts(int, struct mbuf **, struct mbuf *);
+static int ip_setmoptions(struct sockopt *, struct ip_moptions **);
+
+static void ip_out_cksum_stats(int, u_int32_t);
+static struct ifaddr *in_selectsrcif(struct ip *, struct route *, unsigned int);
+static void ip_bindif(struct inpcb *, unsigned int);
+
+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(struct ip *, struct ip *);
+void in_delayed_cksum_offset(struct mbuf *, int );
+void in_cksum_offset(struct mbuf* , size_t );
-void in_delayed_cksum(struct mbuf *m);
-extern int apple_hwcksum_tx;
+extern int (*fr_checkp)(struct ip *, int, struct ifnet *, int, struct mbuf **);
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,
+ &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,
+ &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,
+ &ip_select_srcif_debug, 0, "log source interface selection debug info");
+
/*
* IP output. The packet in mbuf chain m contains a skeletal IP
* header (with len, off, ttl, proto, tos, src, dst).
* The mbuf opt, if present, will not be freed.
*/
int
-ip_output(m0, opt, ro, flags, imo)
- struct mbuf *m0;
- struct mbuf *opt;
- struct route *ro;
- int flags;
- struct ip_moptions *imo;
+ip_output(
+ struct mbuf *m0,
+ struct mbuf *opt,
+ struct route *ro,
+ int flags,
+ struct ip_moptions *imo,
+ struct ip_out_args *ipoa)
{
- struct ip *ip, *mhip;
- struct ifnet *ifp;
- u_long dl_tag;
- struct mbuf *m = m0;
+ 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]
+ * <fr_checkp>:??? [firewall]
+ * 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, **mppn = NULL;
int hlen = sizeof (struct ip);
- int len, off, error = 0;
- struct sockaddr_in *dst;
- struct in_ifaddr *ia;
+ int len = 0, off, error = 0;
+ struct sockaddr_in *dst = NULL;
+ struct in_ifaddr *ia = NULL, *src_ia = NULL;
int isbroadcast, sw_csum;
+ struct in_addr pkt_dst;
#if IPSEC
struct route iproute;
- struct socket *so;
+ struct socket *so = NULL;
struct secpolicy *sp = NULL;
#endif
#if IPFIREWALL_FORWARD
int fwd_rewrite_src = 0;
#endif
-
-
-#if !IPDIVERT /* dummy variable for the firewall code to play with */
- u_short ip_divert_cookie = 0 ;
-#endif
-#if COMPAT_IPFW
- struct ip_fw_chain *rule = NULL ;
+#if IPFIREWALL
+ struct ip_fw_args args;
#endif
+ int didfilter = 0;
+ ipfilter_t inject_filter_ref = 0;
+ struct m_tag *tag;
+ struct route saved_route;
+ struct ip_out_args saved_ipoa;
+ struct mbuf * packetlist;
+ int pktcnt = 0, tso = 0;
+ unsigned int ifscope;
+ boolean_t select_srcif;
KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0);
-#if IPSEC
- /*
- * NOTE: m->m_pkthdr is NULL cleared below just to prevent ipfw code
- * from SEGV.
- * ipfw code uses rcvif to determine incoming interface, and
- * KAME uses rcvif for ipsec processing.
- * ipfw may not be working right with KAME at this moment.
- * We need more tests.
- */
+ packetlist = m0;
+#if IPFIREWALL
+ args.next_hop = NULL;
+ args.eh = NULL;
+ args.rule = NULL;
+ args.divert_rule = 0; /* divert cookie */
+ args.ipoa = NULL;
+
+ if (SLIST_EMPTY(&m0->m_pkthdr.tags))
+ goto ipfw_tags_done;
+
+ /* Grab info from mtags prepended to the chain */
#if DUMMYNET
- if (m->m_type == MT_DUMMYNET) {
- if (m->m_next != NULL) {
- so = (struct socket *)m->m_next->m_pkthdr.rcvif;
- m->m_next->m_pkthdr.rcvif = NULL;
- } else
- so = NULL;
- } else
-#endif
- {
- so = ipsec_getsocket(m);
- ipsec_setsocket(m, NULL);
+ 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.rule = dn_tag->rule;
+ opt = NULL;
+ saved_route = dn_tag->ro;
+ ro = &saved_route;
+
+ imo = NULL;
+ dst = dn_tag->dn_dst;
+ ifp = dn_tag->ifp;
+ flags = dn_tag->flags;
+ saved_ipoa = dn_tag->ipoa;
+ ipoa = &saved_ipoa;
+
+ m_tag_delete(m0, tag);
}
-#endif /*IPSEC*/
+#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;
-#if IPFIREWALL && DUMMYNET
- /*
- * dummynet packet are prepended a vestigial mbuf with
- * m_type = MT_DUMMYNET and m_data pointing to the matching
- * rule.
- */
- if (m->m_type == MT_DUMMYNET) {
- struct mbuf *tmp_m = m ;
- /*
- * the packet was already tagged, so part of the
- * processing was already done, and we need to go down.
- * opt, flags and imo have already been used, and now
- * they are used to hold ifp and hlen and NULL, respectively.
- */
- rule = (struct ip_fw_chain *)(m->m_data) ;
- m = m->m_next ;
- FREE(tmp_m, M_IPFW);
- ip = mtod(m, struct ip *);
- dst = (struct sockaddr_in *)&ro->ro_dst;
- ifp = (struct ifnet *)opt;
- hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
- opt = NULL ;
- flags = 0 ; /* XXX is this correct ? */
- goto sendit;
- } else
- rule = NULL ;
-#endif
+ div_tag = (struct divert_tag *)(tag+1);
+ args.divert_rule = div_tag->cookie;
+
+ m_tag_delete(m0, tag);
+ }
+#endif /* IPDIVERT */
+
+ 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);
+ args.next_hop = ipfwd_tag->next_hop;
+
+ m_tag_delete(m0, tag);
+ }
+ipfw_tags_done:
+#endif /* IPFIREWALL */
+
+ 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
+
+ /*
+ * At present the IP_OUTARGS flag implies a request for IP to
+ * perform source interface selection. In the forwarding case,
+ * only the ifscope value is used, as source interface selection
+ * doesn't take place.
+ */
+ if (ip_doscopedroute && (flags & IP_OUTARGS)) {
+ select_srcif = !(flags & IP_FORWARDING);
+ ifscope = ipoa->ipoa_ifscope;
+ } else {
+ select_srcif = FALSE;
+ ifscope = IFSCOPE_NONE;
+ }
+
+#if IPFIREWALL
+ if (args.rule != NULL) { /* dummynet already saw us */
+ ip = mtod(m, struct ip *);
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
+ if (ro->ro_rt != NULL) {
+ RT_LOCK_SPIN(ro->ro_rt);
+ ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa;
+ if (ia)
+ ifaref(&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
+ goto sendit;
+ }
+#endif /* IPFIREWALL */
+
+#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;
}
ip = mtod(m, struct ip *);
+#if IPFIREWALL
+ pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst;
+#else
+ pkt_dst = ip->ip_dst;
+#endif
+
/*
* Fill in IP header.
*/
if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
ip->ip_off &= IP_DF;
+#if RANDOM_IP_ID
+ ip->ip_id = ip_randomid();
+#else
ip->ip_id = htons(ip_id++);
- ipstat.ips_localout++;
+#endif
+ 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;
+
/*
* If there is a cached route,
* check that it is to the same destination
* and is still up. If not, free it and try again.
+ * The address family should also be checked in case of sharing the
+ * cache with IPv6.
*/
- if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 ||
- dst->sin_addr.s_addr != ip->ip_dst.s_addr)) {
- RTFREE(ro->ro_rt);
- ro->ro_rt = (struct rtentry *)0;
+
+ if (ro->ro_rt != NULL) {
+ if (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;
+ }
+ ifafree(&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,
#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)
+ ifafree(&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;
- dl_tag = ia->ia_ifa.ifa_dlt;
ip->ip_ttl = 1;
isbroadcast = in_broadcast(dst->sin_addr, ifp);
+ } else if (IN_MULTICAST(ntohl(pkt_dst.s_addr)) &&
+ imo != NULL && imo->imo_multicast_ifp != NULL) {
+ /*
+ * Bypass the normal routing lookup for multicast
+ * packets if the interface is specified.
+ */
+ ifp = imo->imo_multicast_ifp;
+ isbroadcast = 0;
+ if (ia != NULL)
+ ifafree(&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 is spoofed (in the case
+ * of IP_RAWOUTPUT), 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) &&
+ 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;
+ ifafree(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 (ro->ro_rt == NULL) {
+ OSAddAtomic(1, &ipstat.ips_noroute);
error = EHOSTUNREACH;
goto bad;
}
+
+ if (ia)
+ ifafree(&ia->ia_ifa);
+ RT_LOCK_SPIN(ro->ro_rt);
ia = ifatoia(ro->ro_rt->rt_ifa);
+ if (ia)
+ ifaref(&ia->ia_ifa);
ifp = ro->ro_rt->rt_ifp;
- dl_tag = ro->ro_rt->rt_dlt;
ro->ro_rt->rt_use++;
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway;
- if (ro->ro_rt->rt_flags & RTF_HOST)
+ 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;
m->m_flags |= M_MCAST;
* See if the caller provided any multicast options
*/
if (imo != NULL) {
- ip->ip_ttl = imo->imo_multicast_ttl;
- if (imo->imo_multicast_ifp != NULL)
+ if ((flags & IP_RAWOUTPUT) == 0) ip->ip_ttl = imo->imo_multicast_ttl;
+ if (imo->imo_multicast_ifp != NULL) {
ifp = imo->imo_multicast_ifp;
- if (imo->imo_multicast_vif != -1)
+ }
+#if MROUTING
+ 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);
+ ip_mcast_src(imo->imo_multicast_vif);
+#endif /* MROUTING */
} else
- ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
+ if ((flags & IP_RAWOUTPUT) == 0) ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL;
/*
* Confirm that the outgoing interface supports multicast.
*/
if ((imo == NULL) || (imo->imo_multicast_vif == -1)) {
if ((ifp->if_flags & IFF_MULTICAST) == 0) {
- ipstat.ips_noroute++;
+ 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;
-
- for (ia1 = in_ifaddrhead.tqh_first; ia1;
- ia1 = ia1->ia_link.tqe_next)
+ struct in_ifaddr *ia1;
+ lck_rw_lock_shared(in_ifaddr_rwlock);
+ TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link)
if (ia1->ia_ifp == ifp) {
ip->ip_src = IA_SIN(ia1)->sin_addr;
break;
}
+ 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);
+ ifnet_lock_shared(ifp);
+ IN_LOOKUP_MULTI(pkt_dst, ifp, inm);
+ ifnet_lock_done(ifp);
if (inm != NULL &&
(imo == NULL || imo->imo_multicast_loop)) {
/*
* 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);
+ struct ipf_pktopts *ippo = 0, ipf_pktopts;
+
+ if (imo) {
+ ippo = &ipf_pktopts;
+ ipf_pktopts.ippo_mcast_ifnet = imo->imo_multicast_ifp;
+ ipf_pktopts.ippo_mcast_ttl = imo->imo_multicast_ttl;
+ ipf_pktopts.ippo_mcast_loop = imo->imo_multicast_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();
+ 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();
+ didfilter = 1;
+ }
ip_mloopback(ifp, m, dst, hlen);
}
+#if MROUTING
else {
/*
* If we are acting as a multicast router, perform
}
}
}
+#endif /* MROUTING */
/*
* Multicasts with a time-to-live of zero may be looped-
#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:
- /*
- * 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 COMPAT_IPFW
- if (ip_nat_ptr && !(*ip_nat_ptr)(&ip, &m, ifp, IP_NAT_OUT)) {
- error = EACCES;
+#if PF
+ /* Invoke outbound packet filter */
+ if (pf_af_hook(ifp, mppn, &m, AF_INET, FALSE) != 0) {
+ if (packetlist == m0) {
+ packetlist = m;
+ mppn = NULL;
+ }
+ 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;
}
-
- /*
- * Check with the firewall...
- */
- if (ip_fw_chk_ptr) {
- struct sockaddr_in *old = dst;
-
- off = (*ip_fw_chk_ptr)(&ip,
- hlen, ifp, &ip_divert_cookie, &m, &rule, &dst);
- /*
- * On return we must do the following:
- * m == NULL -> drop the pkt
- * 1<=off<= 0xffff -> DIVERT
- * (off & 0x10000) -> send to a DUMMYNET pipe
- * dst != old -> IPFIREWALL_FORWARD
- * off==0, dst==old -> accept
- * If some of the above modules is not compiled in, then
- * we should't have to check the corresponding condition
- * (because the ipfw control socket should not accept
- * unsupported rules), but better play safe and drop
- * packets in case of doubt.
- */
- if (!m) { /* firewall said to reject */
- error = EACCES;
- goto done;
+ m0 = m;
+ ip = mtod(m, struct ip *);
+ pkt_dst = ip->ip_dst;
+ hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+#endif /* PF */
+ /*
+ * Force IP TTL to 255 following draft-ietf-zeroconf-ipv4-linklocal.txt
+ */
+ if (IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)) || IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) {
+ ip_linklocal_stat.iplls_out_total++;
+ if (ip->ip_ttl != MAXTTL) {
+ ip_linklocal_stat.iplls_out_badttl++;
+ ip->ip_ttl = MAXTTL;
}
- if (off == 0 && dst == old) /* common case */
- goto pass ;
-#if DUMMYNET
- if (off & 0x10000) {
- /*
- * pass the pkt to dummynet. Need to include
- * pipe number, m, ifp, ro, hlen 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!
- */
- dummynet_io(off & 0xffff, DN_TO_IP_OUT, m,ifp,ro,hlen,rule);
- goto done;
+ }
+
+ if (!didfilter && !TAILQ_EMPTY(&ipv4_filters)) {
+ struct ipfilter *filter;
+ int seen = (inject_filter_ref == 0);
+
+ /* 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;
}
-#endif
-#if IPDIVERT
- if (off > 0 && off < 0x10000) { /* Divert packet */
-
- /*
- * delayed checksums are not currently compatible
- * with divert sockets.
- */
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
- in_delayed_cksum(m);
- if (m == NULL)
- return(ENOMEM);
- m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
- }
- /* Restore packet header fields to original values */
- ip->ip_len = htons((u_short)ip->ip_len);
- ip->ip_off = htons((u_short)ip->ip_off);
+ ipf_ref();
+
+ /* 4135317 - always pass network byte order to filter */
- ip_divert_port = off & 0xffff ;
- (*ip_protox[IPPROTO_DIVERT]->pr_input)(m, 0);
- goto done;
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+
+ TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) {
+ if (seen == 0) {
+ if ((struct ipfilter *)inject_filter_ref == filter)
+ seen = 1;
+ } else if (filter->ipf_filter.ipf_output) {
+ errno_t result;
+ result = filter->ipf_filter.ipf_output(filter->ipf_filter.cookie, (mbuf_t*)&m, 0);
+ 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
-#if IPFIREWALL_FORWARD
- /* Here we check dst to make sure it's directly reachable on the
- * interface we previously thought it was.
- * If it isn't (which may be likely in some situations) we have
- * to re-route it (ie, find a route for the next-hop and the
- * associated interface) and set them here. This is nested
- * forwarding which in most cases is undesirable, except where
- * such control is nigh impossible. So we do it here.
- * And I'm babbling.
+ ipf_unref();
+ }
+
+#if IPSEC
+ /* temporary for testing only: bypass ipsec alltogether */
+
+ if (ipsec_bypass != 0 || (flags & IP_NOIPSEC) != 0)
+ goto skip_ipsec;
+
+ 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);
+ else
+ sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
+
+ if (sp == NULL) {
+ IPSEC_STAT_INCREMENT(ipsecstat.out_inval);
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 0,0,0,0,0);
+ goto bad;
+ }
+
+ error = 0;
+
+ /* check policy */
+ switch (sp->policy) {
+ case IPSEC_POLICY_DISCARD:
+ case IPSEC_POLICY_GENERATE:
+ /*
+ * This packet is just discarded.
*/
- if (off == 0 && old != dst) {
- struct in_ifaddr *ia;
-
- /* It's changed... */
- /* There must be a better way to do this next line... */
- static struct route sro_fwd, *ro_fwd = &sro_fwd;
-#if IPFIREWALL_FORWARD_DEBUG
- printf("IPFIREWALL_FORWARD: New dst ip: ");
- print_ip(dst->sin_addr);
- printf("\n");
-#endif
- /*
- * We need to figure out if we have been forwarded
- * to a local socket. If so then we should somehow
- * "loop back" to ip_input, and get directed to the
- * PCB as if we had received this packet. This is
- * because it may be dificult to identify the packets
- * you want to forward until they are being output
- * and have selected an interface. (e.g. locally
- * initiated packets) If we used the loopback inteface,
- * we would not be able to control what happens
- * as the packet runs through ip_input() as
- * it is done through a ISR.
- */
- for (ia = TAILQ_FIRST(&in_ifaddrhead); ia;
- ia = TAILQ_NEXT(ia, 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)
- break;
- }
- if (ia) {
- /* tell ip_input "dont filter" */
- ip_fw_fwd_addr = dst;
- if (m->m_pkthdr.rcvif == NULL)
- m->m_pkthdr.rcvif = ifunit("lo0");
-
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
- m->m_pkthdr.csum_flags |=
- CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
- m0->m_pkthdr.csum_data = 0xffff;
- }
- m->m_pkthdr.csum_flags |=
- CSUM_IP_CHECKED | CSUM_IP_VALID;
- ip->ip_len = htons((u_short)ip->ip_len);
- ip->ip_off = htons((u_short)ip->ip_off);
-
-
- ip_input(m);
- goto done;
- }
- /* Some of the logic for this was
- * nicked from above.
- *
- * This rewrites the cached route in a local PCB.
- * Is this what we want to do?
- */
- bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
-
- ro_fwd->ro_rt = 0;
- rtalloc_ign(ro_fwd, RTF_PRCLONING);
-
- if (ro_fwd->ro_rt == 0) {
- ipstat.ips_noroute++;
- error = EHOSTUNREACH;
- goto bad;
- }
-
- ia = ifatoia(ro_fwd->ro_rt->rt_ifa);
- ifp = ro_fwd->ro_rt->rt_ifp;
- dl_tag = ro->ro_rt->rt_dlt;
- ro_fwd->ro_rt->rt_use++;
- if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY)
- dst = (struct sockaddr_in *)ro_fwd->ro_rt->rt_gateway;
- if (ro_fwd->ro_rt->rt_flags & RTF_HOST)
- isbroadcast =
- (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
- else
- isbroadcast = in_broadcast(dst->sin_addr, ifp);
- RTFREE(ro->ro_rt);
- ro->ro_rt = ro_fwd->ro_rt;
- dst = (struct sockaddr_in *)&ro_fwd->ro_dst;
-
- /*
- * If we added a default src ip earlier,
- * which would have been gotten from the-then
- * interface, do it again, from the new one.
- */
- if (fwd_rewrite_src)
- ip->ip_src = IA_SIN(ia)->sin_addr;
- goto pass ;
- }
-#endif /* IPFIREWALL_FORWARD */
- /*
- * if we get here, none of the above matches, and
- * we have to drop the pkt
- */
- m_freem(m);
- error = EACCES; /* not sure this is the right error msg */
- goto done;
- }
-#endif /* COMPAT_IPFW */
-
-pass:
-
-#if defined(PM)
- /*
- * Processing IP filter/NAT.
- * Return TRUE iff this packet is discarded.
- * Return FALSE iff this packet is accepted.
- */
-
- if (doNatFil && pm_out(ro->ro_rt->rt_ifp, ip, m))
- goto done;
-#endif
-
-#if IPSEC
- /* get SP for this packet */
- if (so == NULL)
- sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, flags, &error);
- else
- sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error);
-
- if (sp == NULL) {
- ipsecstat.out_inval++;
- goto bad;
- }
-
- error = 0;
-
- /* check policy */
- switch (sp->policy) {
- case IPSEC_POLICY_DISCARD:
- /*
- * This packet is just discarded.
- */
- ipsecstat.out_polvio++;
- goto bad;
+ IPSEC_STAT_INCREMENT(ipsecstat.out_polvio);
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 1,0,0,0,0);
+ goto bad;
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_NONE:
/* no need to do IPsec. */
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 2,0,0,0,0);
goto skip_ipsec;
case IPSEC_POLICY_IPSEC:
if (sp->req == NULL) {
- /* XXX should be panic ? */
- printf("ip_output: No IPsec request specified.\n");
- error = EINVAL;
+ /* acquire a policy */
+ error = key_spdacquire(sp);
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 3,0,0,0,0);
goto bad;
}
break;
default:
printf("ip_output: Invalid policy found. %d\n", sp->policy);
}
-
-
{
struct ipsec_output_state state;
bzero(&state, sizeof(state));
state.ro = ro;
state.dst = (struct sockaddr *)dst;
- ip->ip_sum = 0;
-
- /*
- * delayed checksums are not currently compatible with IPsec
- */
- if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
- in_delayed_cksum(m);
- if (m == NULL)
- return(ENOMEM);
- m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
- }
+ ip->ip_sum = 0;
+
+ /*
+ * XXX
+ * delayed checksums are not currently compatible with IPsec
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ }
- ip->ip_len = htons((u_short)ip->ip_len);
- ip->ip_off = htons((u_short)ip->ip_off);
- error = ipsec4_output(&state, sp, flags);
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
- m = state.m;
+ error = ipsec4_output(&state, sp, flags);
+
+ m0 = m = state.m;
+
if (flags & IP_ROUTETOIF) {
/*
* if we have tunnel mode SA, we may need to ignore
}
} else
ro = state.ro;
+
dst = (struct sockaddr_in *)state.dst;
if (error) {
/* mbuf is already reclaimed in ipsec4_output. */
error = 0;
break;
}
+ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 4,0,0,0,0);
goto bad;
}
}
/* be sure to update variables that are affected by ipsec4_output() */
ip = mtod(m, struct ip *);
+
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
+ /* Check that there wasn't a route change and src is still valid */
+ 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)
+ ifafree(&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");
+ 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 {
- /* nobody uses ia beyond here */
+ if (ia)
+ ifafree(&ia->ia_ifa);
+ RT_LOCK_SPIN(ro->ro_rt);
+ ia = ifatoia(ro->ro_rt->rt_ifa);
+ if (ia)
+ ifaref(&ia->ia_ifa);
ifp = ro->ro_rt->rt_ifp;
+ RT_UNLOCK(ro->ro_rt);
}
/* make it flipped, again. */
- ip->ip_len = ntohs((u_short)ip->ip_len);
- ip->ip_off = ntohs((u_short)ip->ip_off);
+
+#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);
+
+ /* Pass to filters again */
+ if (!TAILQ_EMPTY(&ipv4_filters)) {
+ struct ipfilter *filter;
+
+ /* 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, 0);
+ 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
+ /*
+ * 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;
- sw_csum = m->m_pkthdr.csum_flags | CSUM_IP;
+ if ((error = (*fr_checkp)(ip, hlen, ifp, 1, &m1)) || !m1) {
+ goto done;
+ }
+ ip = mtod(m0 = m = m1, struct ip *);
+ }
+ /*
+ * Check with the firewall...
+ * but not if we are already being fwd'd from a firewall.
+ */
+ if (fw_enable && IPFW_LOADED && !args.next_hop) {
+ struct sockaddr_in *old = dst;
- /* frames that can be checksumed by GMACE SUM16 HW: frame >64, no fragments, no UDP odd length */
+ args.m = m;
+ args.next_hop = dst;
+ args.oif = ifp;
+ off = ip_fw_chk_ptr(&args);
+ m = args.m;
+ dst = args.next_hop;
- if (apple_hwcksum_tx && (sw_csum & CSUM_DELAY_DATA) && (ifp->if_hwassist & CSUM_TCP_SUM16)
- && (ip->ip_len > 50) && (ip->ip_len <= ifp->if_mtu)
- && !((ip->ip_len & 0x1) && (sw_csum & CSUM_UDP)) ) {
+ /*
+ * On return we must do the following:
+ * IP_FW_PORT_DENY_FLAG -> drop the pkt (XXX new)
+ * 1<=off<= 0xffff -> DIVERT
+ * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe
+ * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet
+ * dst != old -> IPFIREWALL_FORWARD
+ * off==0, dst==old -> accept
+ * If some of the above modules is not compiled in, then
+ * we should't have to check the corresponding condition
+ * (because the ipfw control socket should not accept
+ * unsupported rules), but better play safe and drop
+ * packets in case of doubt.
+ */
+ m0 = m;
+ if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) {
+ if (m)
+ m_freem(m);
+ error = EACCES ;
+ goto done ;
+ }
+ ip = mtod(m, struct ip *);
+
+ if (off == 0 && dst == old) {/* common case */
+ goto pass ;
+ }
+#if DUMMYNET
+ 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.ro = ro;
+ args.dst = dst;
+ args.flags = flags;
+ if (flags & IP_OUTARGS)
+ args.ipoa = ipoa;
+
+ error = ip_dn_io_ptr(m, off & 0xffff, DN_TO_IP_OUT,
+ &args);
+ goto done;
+ }
+#endif /* DUMMYNET */
+#if IPDIVERT
+ if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) {
+ struct mbuf *clone = NULL;
- /* Apple GMAC HW, expects STUFF_OFFSET << 16 | START_OFFSET */
- u_short offset = (IP_VHL_HL(ip->ip_vhl) << 2) +14 ; /* IP+Enet header length */
- u_short csumprev= m->m_pkthdr.csum_data & 0xFFFF;
- m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_TCP_SUM16; /* for GMAC */
- m->m_pkthdr.csum_data = (csumprev + offset) << 16 ;
- m->m_pkthdr.csum_data += offset;
- sw_csum = CSUM_DELAY_IP; /* do IP hdr chksum in software */
- }
- else {
- if (ifp->if_hwassist & CSUM_TCP_SUM16) /* force SW checksuming */
- m->m_pkthdr.csum_flags = 0;
- else { /* not Apple enet */
- m->m_pkthdr.csum_flags = sw_csum & ifp->if_hwassist;
- sw_csum &= ~ifp->if_hwassist;
+ /* Clone packet if we're doing a 'tee' */
+ if ((off & IP_FW_PORT_TEE_FLAG) != 0)
+ clone = m_dup(m, M_DONTWAIT);
+ /*
+ * XXX
+ * delayed checksums are not currently compatible
+ * with divert sockets.
+ */
+ if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ }
+
+ /* Restore packet header fields to original values */
+
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+
+ /* Deliver packet to divert input routine */
+ divert_packet(m, 0, off & 0xffff, args.divert_rule);
+
+ /* If 'tee', continue with original packet */
+ if (clone != NULL) {
+ m0 = m = clone;
+ ip = mtod(m, struct ip *);
+ goto pass;
+ }
+ goto done;
}
+#endif
+
+#if IPFIREWALL_FORWARD
+ /* Here we check dst to make sure it's directly reachable on the
+ * interface we previously thought it was.
+ * If it isn't (which may be likely in some situations) we have
+ * to re-route it (ie, find a route for the next-hop and the
+ * associated interface) and set them here. This is nested
+ * forwarding which in most cases is undesirable, except where
+ * such control is nigh impossible. So we do it here.
+ * And I'm babbling.
+ */
+ if (off == 0 && old != dst) {
+ struct in_ifaddr *ia_fw;
+
+ /* It's changed... */
+ /* There must be a better way to do this next line... */
+ static struct route sro_fwd, *ro_fwd = &sro_fwd;
+#if IPFIREWALL_FORWARD_DEBUG
+ printf("IPFIREWALL_FORWARD: New dst ip: ");
+ print_ip(dst->sin_addr);
+ printf("\n");
+#endif
+ /*
+ * We need to figure out if we have been forwarded
+ * to a local socket. If so then we should somehow
+ * "loop back" to ip_input, and get directed to the
+ * PCB as if we had received this packet. This is
+ * because it may be dificult to identify the packets
+ * you want to forward until they are being output
+ * and have selected an interface. (e.g. locally
+ * initiated packets) If we used the loopback inteface,
+ * we would not be able to control what happens
+ * as the packet runs through ip_input() as
+ * it is done through a ISR.
+ */
+ 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_fw)->sin_addr.s_addr ==
+ dst->sin_addr.s_addr)
+ break;
+ }
+ lck_rw_done(in_ifaddr_rwlock);
+ if (ia_fw) {
+ /* tell ip_input "dont filter" */
+ struct m_tag *fwd_tag;
+ struct ip_fwd_tag *ipfwd_tag;
+
+ fwd_tag = m_tag_alloc(KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_IPFORWARD,
+ sizeof (*ipfwd_tag), M_NOWAIT);
+ if (fwd_tag == NULL) {
+ error = ENOBUFS;
+ goto bad;
+ }
+
+ ipfwd_tag = (struct ip_fwd_tag *)(fwd_tag+1);
+ ipfwd_tag->next_hop = args.next_hop;
+
+ m_tag_prepend(m, fwd_tag);
- if (sw_csum & CSUM_DELAY_DATA) { /* perform TCP/UDP checksuming now */
- in_delayed_cksum(m);
- if (m == NULL)
- return(ENOMEM);
- sw_csum &= ~CSUM_DELAY_DATA;
+ if (m->m_pkthdr.rcvif == NULL)
+ m->m_pkthdr.rcvif = ifunit("lo0");
+ 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_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);
+ }
+
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#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);
+ }
+ else {
+ printf("ip_output: no loopback ifp for forwarding!!!\n");
+ }
+ goto done;
+ }
+ /* Some of the logic for this was
+ * nicked from above.
+ *
+ * This rewrites the cached route in a local PCB.
+ * Is this what we want to do?
+ */
+ bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst));
+
+ ro_fwd->ro_rt = NULL;
+ rtalloc_ign(ro_fwd, RTF_PRCLONING);
+
+ if (ro_fwd->ro_rt == NULL) {
+ OSAddAtomic(1, &ipstat.ips_noroute);
+ error = EHOSTUNREACH;
+ goto bad;
+ }
+
+ RT_LOCK_SPIN(ro_fwd->ro_rt);
+ ia_fw = ifatoia(ro_fwd->ro_rt->rt_ifa);
+ if (ia_fw != NULL)
+ ifaref(&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) {
+ isbroadcast =
+ (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST);
+ } 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;
+
+ /*
+ * 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 (ia_fw != NULL) {
+ if (fwd_rewrite_src)
+ ip->ip_src = IA_SIN(ia_fw)->sin_addr;
+ ifafree(&ia_fw->ia_ifa);
+ }
+ goto pass ;
}
- }
+#endif /* IPFIREWALL_FORWARD */
+ /*
+ * if we get here, none of the above matches, and
+ * we have to drop the pkt
+ */
+ m_freem(m);
+ error = EACCES; /* not sure this is the right error msg */
+ goto done;
+ }
+#endif /* IPFIREWALL */
+
+pass:
+#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)) {
+ OSAddAtomic(1, &ipstat.ips_badaddr);
+ m_freem(m);
+ /*
+ * 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);
+
+ if ((ifp->if_hwassist & CSUM_TCP_SUM16) != 0) {
+ /*
+ * Special case code for GMACE
+ * frames that can be checksumed by GMACE SUM16 HW:
+ * frame >64, no fragments, no UDP
+ */
+ if (apple_hwcksum_tx && (m->m_pkthdr.csum_flags & CSUM_TCP)
+ && (ip->ip_len > 50) && (ip->ip_len <= ifp->if_mtu)) {
+ /* Apple GMAC HW, expects STUFF_OFFSET << 16 | START_OFFSET */
+ u_short offset = (IP_VHL_HL(ip->ip_vhl) << 2) +14 ; /* IP+Enet header length */
+ u_short csumprev= m->m_pkthdr.csum_data & 0xFFFF;
+ m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_TCP_SUM16; /* for GMAC */
+ m->m_pkthdr.csum_data = (csumprev + offset) << 16 ;
+ m->m_pkthdr.csum_data += offset;
+ sw_csum = CSUM_DELAY_IP; /* do IP hdr chksum in software */
+ }
+ else {
+ /* let the software handle any UDP or TCP checksums */
+ sw_csum |= (CSUM_DELAY_DATA & m->m_pkthdr.csum_flags);
+ }
+ } 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;
+ }
+
+ 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
+ * If small enough for interface, or the interface will take
* care of the fragmentation for us, can just send directly.
*/
- if ((u_short)ip->ip_len <= ifp->if_mtu ||
- ifp->if_hwassist & CSUM_FRAGMENT) {
+ if ((u_short)ip->ip_len <= ifp->if_mtu || tso ||
+ ifp->if_hwassist & CSUM_FRAGMENT) {
+ if (tso)
+ m->m_pkthdr.csum_flags |= CSUM_TSO_IPV4;
+
- ip->ip_len = htons((u_short)ip->ip_len);
- ip->ip_off = htons((u_short)ip->ip_off);
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(ip->ip_len);
+ HTONS(ip->ip_off);
+#endif
+
ip->ip_sum = 0;
- if (sw_csum & CSUM_DELAY_IP)
+ if (sw_csum & CSUM_DELAY_IP) {
ip->ip_sum = in_cksum(m, hlen);
- error = dlil_output(dl_tag, m, (void *) ro->ro_rt,
- (struct sockaddr *)dst, 0);
- goto done;
+ }
+
+#ifndef __APPLE__
+ /* Record statistics for this interface address. */
+ if (!(flags & IP_FORWARDING) && ia != NULL) {
+ ia->ia_ifa.if_opackets++;
+ ia->ia_ifa.if_obytes += m->m_pkthdr.len;
+ }
+#endif
+
+#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 (packetchain == 0) {
+ error = ifnet_output(ifp, PF_INET, m, ro->ro_rt,
+ (struct sockaddr *)dst);
+ goto done;
+ }
+ else { /* packet chaining allows us to reuse the route for all packets */
+ mppn = &m->m_nextpkt;
+ m = m->m_nextpkt;
+ if (m == NULL) {
+#if PF
+sendchain:
+#endif /* PF */
+ if (pktcnt > ip_maxchainsent)
+ ip_maxchainsent = pktcnt;
+ //send
+ error = ifnet_output(ifp, PF_INET, packetlist,
+ ro->ro_rt, (struct sockaddr *)dst);
+ pktcnt = 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)) {
error = EMSGSIZE;
/*
* This case can happen if the user changed the MTU
+ *
* of an interface after enabling IP on it. Because
* most netifs don't keep track of routes pointing to
* 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))
+ RT_LOCK_SPIN(ro->ro_rt);
+ if (ro->ro_rt && (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;
}
- ipstat.ips_cantfrag++;
+ RT_UNLOCK(ro->ro_rt);
+ 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;
}
- /*
- * 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;
- }
+ 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);
+ error = ifnet_output(ifp, PF_INET, m, ro->ro_rt,
+ (struct sockaddr *)dst);
+ } else
+ m_freem(m);
+ }
+ if (error == 0)
+ OSAddAtomic(1, &ipstat.ips_fragmented);
- {
- int mhlen, firstlen = len;
- struct mbuf **mnext = &m->m_nextpkt;
- int nfrags = 1;
-
+done:
+ if (ia) {
+ ifafree(&ia->ia_ifa);
+ ia = NULL;
+ }
+#if IPSEC
+ if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) {
+ if (ro == &iproute && ro->ro_rt) {
+ rtfree(ro->ro_rt);
+ ro->ro_rt = NULL;
+ }
+ 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);
+ m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ }
/*
* Loop through length of segment after first fragment,
m0 = m;
mhlen = sizeof (struct ip);
for (off = hlen + len; off < (u_short)ip->ip_len; off += len) {
- MGETHDR(m, M_DONTWAIT, MT_HEADER);
+ 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.csum_flags = m0->m_pkthdr.csum_flags;
- mhip->ip_off = htons((u_short)mhip->ip_off);
+ 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;
+#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)
+ if (sw_csum & CSUM_DELAY_IP) {
mhip->ip_sum = in_cksum(m, mhlen);
+ }
*mnext = m;
mnext = &m->m_nextpkt;
nfrags++;
}
- ipstat.ips_ofragments += nfrags;
+ OSAddAtomic(nfrags, &ipstat.ips_ofragments);
/* set first/last markers for fragment chain */
- m0->m_flags |= M_FRAG;
+ m->m_flags |= M_LASTFRAG;
+ m0->m_flags |= M_FIRSTFRAG | M_FRAG;
m0->m_pkthdr.csum_data = nfrags;
/*
m_adj(m, hlen + firstlen - (u_short)ip->ip_len);
m->m_pkthdr.len = hlen + firstlen;
ip->ip_len = htons((u_short)m->m_pkthdr.len);
- ip->ip_off = htons((u_short)(ip->ip_off | IP_MF));
+ 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)
+ 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 (error == 0)
- error = dlil_output(dl_tag, m, (void *) ro->ro_rt,
- (struct sockaddr *)dst, 0);
- else
- m_freem(m);
+static void
+ip_out_cksum_stats(int proto, u_int32_t len)
+{
+ switch (proto) {
+ case IPPROTO_TCP:
+ tcp_out_cksum_stats(len);
+ break;
+ case IPPROTO_UDP:
+ udp_out_cksum_stats(len);
+ break;
+ default:
+ /* keep only TCP or UDP stats for now */
+ break;
}
+}
- if (error == 0)
- ipstat.ips_fragmented++;
- }
-done:
-#if IPSEC
- if (ro == &iproute && ro->ro_rt) {
- RTFREE(ro->ro_rt);
- ro->ro_rt = NULL;
+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;
+ struct mbuf *m = m0;
+
+ 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;
+ }
}
- if (sp != NULL) {
- KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
- printf("DP ip_output call free SP:%x\n", sp));
- key_freesp(sp);
+
+ /* Sometimes the IP header is not contiguous, yes this can happen! */
+ if (ip_offset + sizeof(struct ip) > m->m_len) {
+#if DEBUG
+ printf("delayed m_pullup, m->len: %d off: %d\n",
+ m->m_len, ip_offset);
+#endif
+ m_copydata(m, ip_offset, sizeof(struct ip), (caddr_t) buf);
+
+ ip = (struct ip *)buf;
+ } else {
+ ip = (struct ip*)(m->m_data + ip_offset);
}
-#endif /* IPSEC */
+
+ /* Gross */
+ if (ip_offset) {
+ m->m_len -= ip_offset;
+ m->m_data += ip_offset;
+ }
+
+ offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
- KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error,0,0,0,0);
- return (error);
-bad:
- m_freem(m0);
- goto done;
-}
+ /*
+ * We could be in the context of an IP or interface filter; in the
+ * former case, ip_len would be in host (correct) order while for
+ * the latter it would be in network order. Because of this, we
+ * attempt to interpret the length field by comparing it against
+ * the actual packet length. If the comparison fails, byte swap
+ * the length and check again. If it still fails, then the packet
+ * is bogus and we give up.
+ */
+ ip_len = ip->ip_len;
+ if (ip_len != (m0->m_pkthdr.len - ip_offset)) {
+ ip_len = SWAP16(ip_len);
+ if (ip_len != (m0->m_pkthdr.len - ip_offset)) {
+ 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));
+ 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;
+ }
+
+ if (offset > ip_len) /* bogus offset */
+ return;
-extern u_short in_chksum_skip(struct mbuf *, int, int);
+ /* 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 *)tmp = csum;
+ m_copyback(m, offset + ip_offset, 2, tmp);
+ } else
+ *(u_short *)(m->m_data + offset + ip_offset) = csum;
+}
void
in_delayed_cksum(struct mbuf *m)
{
- struct ip *ip;
- u_short csum, csum2, offset;
+ in_delayed_cksum_offset(m, 0);
+}
- ip = mtod(m, struct ip *);
- offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
+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;
+
+ 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;
+ }
+ }
+
+ /* Sometimes the IP header is not contiguous, yes this can happen! */
+ if (ip_offset + sizeof(struct ip) > m->m_len) {
- csum = in_cksum_skip(m, ip->ip_len, 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);
- if ((m->m_pkthdr.csum_flags & CSUM_UDP) && csum == 0)
- csum = 0xffff;
+ ip = (struct ip *)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*)(m->m_data + ip_offset);
+ ip->ip_sum = 0;
+ }
+
+ /* Gross */
+ if (ip_offset) {
+ m->m_len -= ip_offset;
+ m->m_data += ip_offset;
+ }
- offset += m->m_pkthdr.csum_data & 0xFFFF; /* checksum 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) != (m->m_pkthdr.len - ip_offset)) {
+ ip->ip_len = SWAP16(ip->ip_len);
+ swapped = 1;
+ if (ntohs(ip->ip_len) != (m->m_pkthdr.len - ip_offset)) {
+ 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),
+ (m->m_pkthdr.len - ip_offset));
+ return;
+ }
+ }
- if (offset > ip->ip_len) /* bogus offset */
- 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;
+ }
- 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.
- */
- if (m = m_pullup(m, offset + sizeof(u_short)) == 0)
- return;
- }
+ /* Insert the checksum in the existing chain if IP header not contiguous */
+ if (ip_offset + sizeof(struct ip) > m->m_len) {
+ char tmp[2];
- *(u_short *)(m->m_data + offset) = csum;
+#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 *)tmp = ip->ip_sum;
+ m_copyback(m, ip_offset + offsetof(struct ip, ip_sum), 2, tmp);
+ }
}
/*
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 = 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);
*dp++ = IPOPT_NOP;
optlen = 1;
continue;
- } else
- optlen = cp[IPOPT_OLEN];
+ }
+#if DIAGNOSTIC
+ if (cnt < IPOPT_OLEN + sizeof(*cp))
+ panic("malformed IPv4 option passed to ip_optcopy");
+#endif
+ optlen = cp[IPOPT_OLEN];
+#if DIAGNOSTIC
+ if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt)
+ panic("malformed IPv4 option passed to ip_optcopy");
+#endif
/* bogus lengths should have been caught by ip_dooptions */
if (optlen > cnt)
optlen = cnt;
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_RECVRETOPTS:
case IP_RECVDSTADDR:
case IP_RECVIF:
+ case IP_RECVTTL:
+#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
+#endif
error = sooptcopyin(sopt, &optval, sizeof optval,
sizeof optval);
if (error)
OPTSET(INP_RECVIF);
break;
+ case IP_RECVTTL:
+ OPTSET(INP_RECVTTL);
+ break;
+
+#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
OPTSET(INP_FAITH);
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] == NULL) {
+ /* Unbind this socket from any interface */
+ ifscope = IFSCOPE_NONE;
+ } else {
+ ifnet_t ifp;
+
+ /* Verify name is NULL terminated */
+ if (ifname[sopt->sopt_valsize - 1] != NULL) {
+ 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);
+ }
+ ip_bindif(inp, ifscope);
+ }
+ break;
+#endif
case IP_MULTICAST_IF:
case IP_MULTICAST_VIF:
case IP_MULTICAST_TTL:
struct mbuf *m;
int optname;
- if (error = sooptgetm(sopt, &m)) /* XXX */
+ if (sopt->sopt_valsize > MCLBYTES) {
+ error = EMSGSIZE;
+ break;
+ }
+ if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */
break;
- if (error = sooptmcopyin(sopt, m)) /* XXX */
+ 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(so,
+ TRAFFIC_MGT_SO_BACKGROUND |
+ TRAFFIC_MGT_SO_BG_REGULATE);
+ } else {
+ socket_clear_traffic_mgt_flags(so,
+ TRAFFIC_MGT_SO_BACKGROUND |
+ TRAFFIC_MGT_SO_BG_REGULATE);
+ }
+
+ 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 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
+ * transmit interface set via IP_MULTICAST_IF.
+ */
+ 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;
+
+ ip_bindif(inp, optval);
+ break;
+
default:
error = ENOPROTOOPT;
break;
case IP_RECVRETOPTS:
case IP_RECVDSTADDR:
case IP_RECVIF:
+ case IP_RECVTTL:
case IP_PORTRANGE:
+#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
+#endif
switch (sopt->sopt_name) {
case IP_TOS:
optval = OPTBIT(INP_RECVIF);
break;
+ case IP_RECVTTL:
+ optval = OPTBIT(INP_RECVTTL);
+ break;
+
case IP_PORTRANGE:
if (inp->inp_flags & INP_HIGHPORT)
optval = IP_PORTRANGE_HIGH;
optval = 0;
break;
+#if defined(NFAITH) && NFAITH > 0
case IP_FAITH:
optval = OPTBIT(INP_FAITH);
break;
+#endif
}
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
case IP_IPSEC_POLICY:
{
struct mbuf *m = NULL;
- size_t len = 0;
caddr_t req = NULL;
+ size_t len = 0;
- if (error = sooptgetm(sopt, &m)) /* XXX */
- break;
- if (error = sooptmcopyin(sopt, m)) /* XXX */
- break;
- if (m) {
+ if (m != 0) {
req = mtod(m, caddr_t);
len = m->m_len;
}
-
error = ipsec4_get_policy(sotoinpcb(so), req, len, &m);
if (error == 0)
- error = sooptmcopyout(sopt, m); /* XXX */
-
- /* if error, m_freem called at soopt_mcopyout(). */
+ error = soopt_mcopyout(sopt, m); /* XXX */
if (error == 0)
m_freem(m);
break;
}
#endif /*IPSEC*/
+#if TRAFFIC_MGT
+ case IP_TRAFFIC_MGT_BACKGROUND:
+ {
+ unsigned background = so->so_traffic_mgt_flags;
+ return (sooptcopyout(sopt, &background, sizeof(background)));
+ break;
+ }
+#endif /* TRAFFIC_MGT */
+
+ case IP_BOUND_IF:
+ if (inp->inp_flags & INP_BOUND_IF)
+ optval = inp->inp_boundif;
+ 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;
* 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;
+{
+ int ifindex;
+ struct ifnet *ifp;
+
+ if (ifindexp)
+ *ifindexp = 0;
+ if (ntohl(a->s_addr) >> 24 == 0) {
+ ifindex = ntohl(a->s_addr) & 0xffffff;
+ ifnet_head_lock_shared();
+ if (ifindex < 0 || if_index < ifindex) {
+ ifnet_head_done();
+ return NULL;
+ }
+ ifp = ifindex2ifnet[ifindex];
+ ifnet_head_done();
+ if (ifindexp)
+ *ifindexp = ifindex;
+ } else {
+ INADDR_TO_IFP(*a, ifp);
+ }
+ return ifp;
+}
+
/*
* Set the IP multicast options in response to user setsockopt().
*/
struct ip_moptions **imop;
{
int error = 0;
- int i;
struct in_addr addr;
struct ip_mreq mreq;
- struct ifnet *ifp;
+ struct ifnet *ifp = NULL;
struct ip_moptions *imo = *imop;
- struct route ro;
- struct sockaddr_in *dst;
- int s;
+ int ifindex;
if (imo == NULL) {
/*
* No multicast option buffer attached to the pcb;
* allocate one and initialize to default values.
*/
- imo = (struct ip_moptions*) _MALLOC(sizeof(*imo), M_IPMOPTS,
- M_WAITOK);
-
- if (imo == NULL)
- return (ENOBUFS);
- *imop = imo;
- imo->imo_multicast_ifp = NULL;
- imo->imo_multicast_vif = -1;
- imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
- imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
- imo->imo_num_memberships = 0;
+ error = ip_createmoptions(imop);
+ if (error != 0)
+ return error;
+ imo = *imop;
}
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;
+#if MROUTING
+ case IP_MULTICAST_VIF:
+ {
+ int i;
+ 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;
}
- imo->imo_multicast_vif = i;
- break;
+#endif /* MROUTING */
case IP_MULTICAST_IF:
/*
* IP address. Find the interface and confirm that
* it supports multicasting.
*/
- s = splimp();
- INADDR_TO_IFP(addr, ifp);
+ 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;
- splx(s);
+ if (ifindex)
+ imo->imo_multicast_addr = addr;
+ else
+ imo->imo_multicast_addr.s_addr = INADDR_ANY;
break;
case IP_MULTICAST_TTL:
error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
if (error)
break;
-
- if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
- error = EINVAL;
- break;
- }
- s = splimp();
- /*
- * If no interface address was provided, use the interface of
- * the route to the given multicast address.
- */
- if (mreq.imr_interface.s_addr == INADDR_ANY) {
- bzero((caddr_t)&ro, sizeof(ro));
- dst = (struct sockaddr_in *)&ro.ro_dst;
- dst->sin_len = sizeof(*dst);
- dst->sin_family = AF_INET;
- dst->sin_addr = mreq.imr_multiaddr;
- rtalloc(&ro);
- if (ro.ro_rt == NULL) {
- error = EADDRNOTAVAIL;
- splx(s);
- break;
- }
- ifp = ro.ro_rt->rt_ifp;
- rtfree(ro.ro_rt);
- }
- else {
- INADDR_TO_IFP(mreq.imr_interface, ifp);
- }
-
- /*
- * See if we found an interface, and confirm that it
- * supports multicast.
- */
- if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
- error = EADDRNOTAVAIL;
- splx(s);
- break;
- }
- /*
- * See if the membership already exists or if all the
- * membership slots are full.
- */
- for (i = 0; i < imo->imo_num_memberships; ++i) {
- if (imo->imo_membership[i]->inm_ifp == ifp &&
- imo->imo_membership[i]->inm_addr.s_addr
- == mreq.imr_multiaddr.s_addr)
- break;
- }
- if (i < imo->imo_num_memberships) {
- error = EADDRINUSE;
- splx(s);
- break;
- }
- if (i == IP_MAX_MEMBERSHIPS) {
- error = ETOOMANYREFS;
- splx(s);
- break;
- }
- /*
- * Everything looks good; add a new record to the multicast
- * address list for the given interface.
- */
- if ((imo->imo_membership[i] =
- in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
- error = ENOBUFS;
- splx(s);
- break;
- }
- ++imo->imo_num_memberships;
- splx(s);
+
+ error = ip_addmembership(imo, &mreq);
break;
case IP_DROP_MEMBERSHIP:
error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq);
if (error)
break;
-
- if (!IN_MULTICAST(ntohl(mreq.imr_multiaddr.s_addr))) {
- error = EINVAL;
- break;
- }
-
- 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 {
- INADDR_TO_IFP(mreq.imr_interface, ifp);
- if (ifp == NULL) {
- error = EADDRNOTAVAIL;
- splx(s);
- break;
- }
- }
- /*
- * 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 (i == imo->imo_num_memberships) {
- error = EADDRNOTAVAIL;
- splx(s);
- break;
- }
- /*
- * 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);
+
+ error = ip_dropmembership(imo, &mreq);
break;
default:
* 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_vif == (u_int32_t)-1 &&
imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
imo->imo_num_memberships == 0) {
return (error);
}
+/*
+ * 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;
+}
+
+/*
+ * 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 i;
+
+ bzero((caddr_t)&ro, sizeof(ro));
+
+ if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
+ error = EINVAL;
+ goto done;
+ }
+ /*
+ * 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) {
+ dst = (struct sockaddr_in *)&ro.ro_dst;
+ dst->sin_len = sizeof(*dst);
+ dst->sin_family = AF_INET;
+ dst->sin_addr = mreq->imr_multiaddr;
+ rtalloc_ign(&ro, 0);
+ if (ro.ro_rt != NULL) {
+ ifp = ro.ro_rt->rt_ifp;
+ } else {
+ /* If there's no default route, try using loopback */
+ mreq->imr_interface.s_addr = htonl(INADDR_LOOPBACK);
+ }
+ }
+
+ if (ifp == NULL) {
+ ifp = ip_multicast_if(&mreq->imr_interface, NULL);
+ }
+
+ /*
+ * See if we found an interface, and confirm that it
+ * supports multicast.
+ */
+ if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
+ error = EADDRNOTAVAIL;
+ goto done;
+ }
+ /*
+ * See if the membership already exists or if all the
+ * membership slots are full.
+ */
+ for (i = 0; i < imo->imo_num_memberships; ++i) {
+ if (imo->imo_membership[i]->inm_ifp == ifp &&
+ imo->imo_membership[i]->inm_addr.s_addr
+ == mreq->imr_multiaddr.s_addr)
+ break;
+ }
+ if (i < imo->imo_num_memberships) {
+ error = EADDRINUSE;
+ goto done;
+ }
+ if (i == IP_MAX_MEMBERSHIPS) {
+ error = ETOOMANYREFS;
+ goto done;
+ }
+ /*
+ * 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;
+ goto done;
+ }
+ ++imo->imo_num_memberships;
+
+done:
+ if (ro.ro_rt != NULL)
+ rtfree(ro.ro_rt);
+
+ return error;
+}
+
+/*
+ * Drop membership of an IPv4 multicast.
+ */
+__private_extern__ int
+ip_dropmembership(
+ struct ip_moptions *imo,
+ struct ip_mreq *mreq)
+{
+ int error = 0;
+ struct ifnet* ifp = NULL;
+ int i;
+
+ if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) {
+ error = EINVAL;
+ return error;
+ }
+
+ /*
+ * 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;
+ 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 (i == imo->imo_num_memberships) {
+ error = EADDRNOTAVAIL;
+ 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;
+
+ return error;
+}
+
/*
* Return the IP multicast options in response to user getsockopt().
*/
error = 0;
switch (sopt->sopt_name) {
+#if MROUTING
case IP_MULTICAST_VIF:
if (imo != NULL)
optval = imo->imo_multicast_vif;
optval = -1;
error = sooptcopyout(sopt, &optval, sizeof optval);
break;
+#endif /* MROUTING */
case IP_MULTICAST_IF:
if (imo == NULL || imo->imo_multicast_ifp == NULL)
addr.s_addr = INADDR_ANY;
- else {
+ 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;
+ if (ia != NULL)
+ ifafree(&ia->ia_ifa);
}
error = sooptcopyout(sopt, &addr, sizeof addr);
break;
if (imo != NULL) {
for (i = 0; i < imo->imo_num_memberships; ++i)
- in_delmulti(imo->imo_membership[i]);
+ in_delmulti(&imo->imo_membership[i]);
FREE(imo, M_IPMOPTS);
}
}
{
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 *);
- ip->ip_len = htons((u_short)ip->ip_len);
- ip->ip_off = htons((u_short)ip->ip_off);
- ip->ip_sum = 0;
- ip->ip_sum = in_cksum(copym, hlen);
+
+ 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;
+ }
+#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 (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);
+ } 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.
+ */
+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;
/*
- * 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 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 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 (scope == IFSCOPE_NONE) {
+ scope = rt_ifp->if_index;
+ if (scope != get_primary_ifscope() &&
+ ro->ro_rt->generation_id != route_generation)
+ scope = get_primary_ifscope();
}
-#endif
+ ifa = (struct ifaddr *)ifa_foraddr_scoped(src.s_addr, scope);
- /*
- * Mark checksum as valid or calculate checksum for loopback.
- *
- * This is done this way because we have to embed the ifp of
- * the interface we will send the original copy of the packet
- * out on in the mbuf. ip_input will check if_hwassist of the
- * embedded ifp and ignore all csum_flags if if_hwassist is 0.
- * The UDP checksum has not been calculated yet.
- */
- if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
- if (ifp->if_hwassist) {
- copym->m_pkthdr.csum_flags |=
- CSUM_DATA_VALID | CSUM_PSEUDO_HDR |
- CSUM_IP_CHECKED | CSUM_IP_VALID;
- copym->m_pkthdr.csum_data = 0xffff;
- } else
- in_delayed_cksum(copym);
- }
+ 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) {
+ ifafree(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%d "
+ "ro_if %s%d\n", s_src, s_dst, ifscope,
+ scope, ifa->ifa_ifp->if_name,
+ ifa->ifa_ifp->if_unit, rt_ifp->if_name,
+ rt_ifp->if_unit);
+ } else {
+ printf("%s->%s ifscope %d->%d ifa_if %s%d\n",
+ s_src, s_dst, ifscope, scope,
+ ifa->ifa_ifp->if_name,
+ ifa->ifa_ifp->if_unit);
+ }
+ }
+ }
+ /*
+ * 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);
/*
- * TedW:
- * We need to send all loopback traffic down to dlil in case
- * a filter has tapped-in.
+ * 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 (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;
+ ifaref(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.
+ */
+ ifafree(oifa);
+ ifafree(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.
+ */
+ ifafree(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.
+ */
+ ifafree(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.
+ */
+ ifafree(ifa);
+ ifa = ro->ro_rt->rt_ifa;
+ ifaref(ifa);
+ }
+
+ if (ip_select_srcif_debug && ifa != NULL) {
+ printf("%s->%s ifscope %d ifa_if %s%d\n",
+ s_src, s_dst, ifscope, ifa->ifa_ifp->if_name,
+ ifa->ifa_ifp->if_unit);
+ }
+ }
+
+ 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%d != "
+ "ifa_if %s%d (cached route cleared)\n",
+ s_src, s_dst, ifscope, rt_ifp->if_name,
+ rt_ifp->if_unit, ifa->ifa_ifp->if_name,
+ ifa->ifa_ifp->if_unit);
+ } else {
+ printf("%s->%s ifscope %d ro_if %s%d "
+ "(no ifa_if found)\n",
+ s_src, s_dst, ifscope, rt_ifp->if_name,
+ rt_ifp->if_unit);
+ }
+ }
- if (lo_dl_tag == 0)
- dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dl_tag);
+ RT_UNLOCK(ro->ro_rt);
+ rtfree(ro->ro_rt);
+ ro->ro_rt = NULL;
+ ro->ro_flags &= ~ROF_SRCIF_SELECTED;
/*
- * 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 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 (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 (IN_LINKLOCAL(ntohl(dst.s_addr)) &&
+ !IN_LINKLOCAL(ntohl(src.s_addr)) && ifa != NULL) {
+ ifafree(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);
+}
+
+/*
+ * Handler for setting IP_FORCE_OUT_IFP or IP_BOUND_IF socket option.
+ */
+static void
+ip_bindif(struct inpcb *inp, unsigned int ifscope)
+{
+ /*
+ * A zero interface scope value indicates an "unbind".
+ * Otherwise, take in whatever value the app desires;
+ * the app may already know the scope (or force itself
+ * to such a scope) ahead of time before the interface
+ * gets attached. It doesn't matter either way; any
+ * route lookup from this point on will require an
+ * exact match for the embedded interface scope.
+ */
+ inp->inp_boundif = ifscope;
+ if (inp->inp_boundif == IFSCOPE_NONE)
+ inp->inp_flags &= ~INP_BOUND_IF;
+ else
+ inp->inp_flags |= INP_BOUND_IF;
-/* if_simloop(ifp, copym, (struct sockaddr *)dst, 0);*/
+ /* Blow away any cached route in the PCB */
+ if (inp->inp_route.ro_rt != NULL) {
+ rtfree(inp->inp_route.ro_rt);
+ inp->inp_route.ro_rt = NULL;
}
}
projects / apple / xnu.git / blobdiff