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2822 2823 2824 2825 2826 2827 2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857 2858 2859 2860 2861 2862 2863 2864 2865 2866 | /* * Copyright (c) 2000-2007 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1982, 1986, 1988, 1990, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * 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 #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/protosw.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <kern/locks.h> #include <sys/sysctl.h> #include <net/if.h> #include <net/route.h> #include <netinet/in.h> #include <netinet/in_systm.h> #include <netinet/ip.h> #include <netinet/in_pcb.h> #include <netinet/in_var.h> #include <netinet/ip_var.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) #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> #else #define KEYDEBUG(lev,arg) #endif #endif /*IPSEC*/ #include <netinet/ip_fw.h> #include <netinet/ip_divert.h> #if DUMMYNET #include <netinet/ip_dummynet.h> #endif #if IPFIREWALL_FORWARD_DEBUG #define print_ip(a) printf("%ld.%ld.%ld.%ld",(ntohl(a.s_addr)>>24)&0xFF,\ (ntohl(a.s_addr)>>16)&0xFF,\ (ntohl(a.s_addr)>>8)&0xFF,\ (ntohl(a.s_addr))&0xFF); #endif u_short ip_id; static struct mbuf *ip_insertoptions(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); 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 ); extern int (*fr_checkp)(struct ip *, int, struct ifnet *, int, struct mbuf **); extern u_long route_generation; 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 */ /* * IP output. The packet in mbuf chain m contains a skeletal IP * header (with len, off, ttl, proto, tos, src, dst). * The mbuf chain containing the packet will be freed. * The mbuf opt, if present, will not be freed. */ int ip_output( struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags, struct ip_moptions *imo, struct ifnet *ifp) { int error; error = ip_output_list(m0, 0, opt, ro, flags, imo, ifp); 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, #if CONFIG_FORCE_OUT_IFP struct ifnet *pdp_ifp #else __unused struct ifnet *unused_ifp #endif ) { struct ip *ip, *mhip; struct ifnet *ifp = NULL; struct mbuf *m = m0; int hlen = sizeof (struct ip); int len = 0, off, error = 0; struct sockaddr_in *dst = NULL; struct in_ifaddr *ia = NULL; int isbroadcast, sw_csum; struct in_addr pkt_dst; #if IPSEC struct route iproute; struct socket *so = NULL; struct secpolicy *sp = NULL; #endif #if IPFIREWALL_FORWARD int fwd_rewrite_src = 0; #endif struct ip_fw_args args; int didfilter = 0; ipfilter_t inject_filter_ref = 0; struct m_tag *tag; struct route saved_route; struct mbuf * packetlist; int pktcnt = 0; KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0); packetlist = m0; args.next_hop = NULL; #if IPFIREWALL args.eh = NULL; args.rule = NULL; args.divert_rule = 0; /* divert cookie */ /* Grab info from mtags prepended to the chain */ #if DUMMYNET if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) { struct dn_pkt_tag *dn_tag; dn_tag = (struct dn_pkt_tag *)(tag+1); args.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; m_tag_delete(m0, tag); } #endif /* DUMMYNET */ #if IPDIVERT if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_DIVERT, NULL)) != NULL) { struct divert_tag *div_tag; div_tag = (struct divert_tag *)(tag+1); args.divert_rule = div_tag->cookie; m_tag_delete(m0, tag); } #endif /* IPDIVERT */ #endif /* IPFIREWALL */ if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFORWARD, NULL)) != NULL) { struct ip_fwd_tag *ipfwd_tag; ipfwd_tag = (struct ip_fwd_tag *)(tag+1); args.next_hop = ipfwd_tag->next_hop; m_tag_delete(m0, tag); } m = m0; #if DIAGNOSTIC 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 #if IPFIREWALL if (args.rule != NULL) { /* dummynet already saw us */ ip = mtod(m, struct ip *); hlen = IP_VHL_HL(ip->ip_vhl) << 2 ; lck_mtx_lock(rt_mtx); if (ro->ro_rt != NULL) ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa; if (ia) ifaref(&ia->ia_ifa); lck_mtx_unlock(rt_mtx); #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 */ inject_filter_ref = ipf_get_inject_filter(m); if (opt) { m = ip_insertoptions(m, opt, &len); hlen = len; } ip = mtod(m, struct ip *); pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst; /* * 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++); #endif OSAddAtomic(1, (SInt32*)&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. */ lck_mtx_lock(rt_mtx); 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) && (ifa_foraddr(ip->ip_src.s_addr) == 0)) { error = EADDRNOTAVAIL; lck_mtx_unlock(rt_mtx); goto bad; } if ((ro->ro_rt->rt_flags & RTF_UP) == 0 || dst->sin_family != AF_INET || dst->sin_addr.s_addr != pkt_dst.s_addr) { rtfree_locked(ro->ro_rt); ro->ro_rt = NULL; } if (ro->ro_rt && ro->ro_rt->generation_id != route_generation) ro->ro_rt->generation_id = route_generation; } if (ro->ro_rt == NULL) { bzero(dst, sizeof(*dst)); dst->sin_family = AF_INET; dst->sin_len = sizeof(*dst); dst->sin_addr = pkt_dst; } /* * If routing to interface only, * short circuit routing lookup. */ #define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) #define sintosa(sin) ((struct sockaddr *)(sin)) if (flags & IP_ROUTETOIF) { if (ia) ifafree(&ia->ia_ifa); if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0) { if ((ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) { OSAddAtomic(1, (SInt32*)&ipstat.ips_noroute); error = ENETUNREACH; lck_mtx_unlock(rt_mtx); goto bad; } } ifp = ia->ia_ifp; ip->ip_ttl = 1; isbroadcast = in_broadcast(dst->sin_addr, ifp); } else { #if CONFIG_FORCE_OUT_IFP /* Check if this packet should be forced out a specific interface */ if (ro->ro_rt == 0 && pdp_ifp != NULL) { pdp_context_route_locked(pdp_ifp, ro); if (ro->ro_rt == NULL) { OSAddAtomic(1, (UInt32*)&ipstat.ips_noroute); error = EHOSTUNREACH; lck_mtx_unlock(rt_mtx); goto bad; } } #endif /* * If this is the case, we probably don't want to allocate * a protocol-cloned route since we didn't get one from the * ULP. This lets TCP do its thing, while not burdening * forwarding or ICMP with the overhead of cloning a route. * Of course, we still want to do any cloning requested by * the link layer, as this is probably required in all cases * for correct operation (as it is for ARP). */ if (ro->ro_rt == 0) { 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. * * This exception will no longer be necessary when * the RTF_PRCLONING scheme is no longer present. */ if (dst->sin_addr.s_addr == INADDR_BROADCAST) ign &= ~RTF_PRCLONING; rtalloc_ign_locked(ro, ign); } if (ro->ro_rt == 0) { OSAddAtomic(1, (SInt32*)&ipstat.ips_noroute); error = EHOSTUNREACH; lck_mtx_unlock(rt_mtx); goto bad; } if (ia) ifafree(&ia->ia_ifa); ia = ifatoia(ro->ro_rt->rt_ifa); if (ia) ifaref(&ia->ia_ifa); ifp = ro->ro_rt->rt_ifp; ro->ro_rt->rt_use++; if (ro->ro_rt->rt_flags & RTF_GATEWAY) dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; if (ro->ro_rt->rt_flags & RTF_HOST) isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); else isbroadcast = in_broadcast(dst->sin_addr, ifp); } lck_mtx_unlock(rt_mtx); if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) { struct in_multi *inm; m->m_flags |= M_MCAST; /* * IP destination address is multicast. Make sure "dst" * still points to the address in "ro". (It may have been * changed to point to a gateway address, above.) */ dst = (struct sockaddr_in *)&ro->ro_dst; /* * See if the caller provided any multicast options */ if (imo != NULL) { if ((flags & IP_RAWOUTPUT) == 0) ip->ip_ttl = imo->imo_multicast_ttl; if (imo->imo_multicast_ifp != NULL) { ifp = imo->imo_multicast_ifp; } #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); #endif /* MROUTING */ } else 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) { OSAddAtomic(1, (SInt32*)&ipstat.ips_noroute); error = ENETUNREACH; goto bad; } } /* * If source address not specified yet, use address * of outgoing interface. */ if (ip->ip_src.s_addr == INADDR_ANY) { register struct in_ifaddr *ia1; lck_mtx_lock(rt_mtx); TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link) if (ia1->ia_ifp == ifp) { ip->ip_src = IA_SIN(ia1)->sin_addr; break; } lck_mtx_unlock(rt_mtx); if (ip->ip_src.s_addr == INADDR_ANY) { error = ENETUNREACH; goto bad; } } ifnet_lock_shared(ifp); IN_LOOKUP_MULTI(pkt_dst, ifp, inm); ifnet_lock_done(ifp); if (inm != NULL && (imo == NULL || imo->imo_multicast_loop)) { /* * If we belong to the destination multicast group * on the outgoing interface, and the caller did not * forbid loopback, loop back a copy. */ if (!TAILQ_EMPTY(&ipv4_filters)) { struct ipfilter *filter; int seen = (inject_filter_ref == 0); 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 */ HTONS(ip->ip_len); HTONS(ip->ip_off); 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 *); NTOHS(ip->ip_len); NTOHS(ip->ip_off); ipf_unref(); didfilter = 1; } ip_mloopback(ifp, m, dst, hlen); } #if MROUTING else { /* * If we are acting as a multicast router, perform * multicast forwarding as if the packet had just * arrived on the interface to which we are about * to send. The multicast forwarding function * recursively calls this function, using the * IP_FORWARDING flag to prevent infinite recursion. * * Multicasts that are looped back by ip_mloopback(), * above, will be forwarded by the ip_input() routine, * if necessary. */ if (ip_mrouter && (flags & IP_FORWARDING) == 0) { /* * Check if rsvp daemon is running. If not, don't * set ip_moptions. This ensures that the packet * is multicast and not just sent down one link * as prescribed by rsvpd. */ if (!rsvp_on) imo = NULL; if (ip_mforward(ip, ifp, m, imo) != 0) { m_freem(m); goto done; } } } #endif /* MROUTING */ /* * Multicasts with a time-to-live of zero may be looped- * back, above, but must not be transmitted on a network. * Also, multicasts addressed to the loopback interface * are not sent -- the above call to ip_mloopback() will * loop back a copy if this host actually belongs to the * destination group on the loopback interface. */ if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { m_freem(m); goto done; } goto sendit; } #ifndef notdef /* * If source address not specified yet, use address * of outgoing interface. */ if (ip->ip_src.s_addr == INADDR_ANY) { ip->ip_src = IA_SIN(ia)->sin_addr; #if IPFIREWALL_FORWARD /* Keep note that we did this - if the firewall changes * the next-hop, our interface may change, changing the * default source IP. It's a shame so much effort happens * twice. Oh well. */ fwd_rewrite_src++; #endif /* IPFIREWALL_FORWARD */ } #endif /* notdef */ /* * Look for broadcast address and * and verify user is allowed to send * such a packet. */ if (isbroadcast) { if ((ifp->if_flags & IFF_BROADCAST) == 0) { error = EADDRNOTAVAIL; goto bad; } if ((flags & IP_ALLOWBROADCAST) == 0) { error = EACCES; goto bad; } /* don't allow broadcast messages to be fragmented */ if ((u_short)ip->ip_len > ifp->if_mtu) { error = EMSGSIZE; goto bad; } m->m_flags |= M_BCAST; } else { m->m_flags &= ~M_BCAST; } sendit: /* * Force IP TTL to 255 following draft-ietf-zeroconf-ipv4-linklocal.txt */ if (IN_LINKLOCAL(ntohl(ip->ip_src.s_addr)) || IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr))) { ip_linklocal_stat.iplls_out_total++; if (ip->ip_ttl != MAXTTL) { ip_linklocal_stat.iplls_out_badttl++; ip->ip_ttl = MAXTTL; } } if (!didfilter && !TAILQ_EMPTY(&ipv4_filters)) { struct ipfilter *filter; int seen = (inject_filter_ref == 0); ipf_ref(); /* 4135317 - always pass network byte order to filter */ HTONS(ip->ip_len); HTONS(ip->ip_off); 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 *); NTOHS(ip->ip_len); NTOHS(ip->ip_off); 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. */ IPSEC_STAT_INCREMENT(ipsecstat.out_polvio); KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 1,0,0,0,0); goto bad; case IPSEC_POLICY_BYPASS: case IPSEC_POLICY_NONE: /* no need to do IPsec. */ KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 2,0,0,0,0); goto skip_ipsec; case IPSEC_POLICY_IPSEC: if (sp->req == NULL) { /* acquire a policy */ error = key_spdacquire(sp); KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 3,0,0,0,0); goto bad; } break; case IPSEC_POLICY_ENTRUST: default: printf("ip_output: Invalid policy found. %d\n", sp->policy); } { struct ipsec_output_state state; bzero(&state, sizeof(state)); state.m = m; if (flags & IP_ROUTETOIF) { state.ro = &iproute; bzero(&iproute, sizeof(iproute)); } else state.ro = ro; state.dst = (struct sockaddr *)dst; 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; } HTONS(ip->ip_len); HTONS(ip->ip_off); 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 * IP_ROUTETOIF. */ if (state.ro != &iproute || state.ro->ro_rt != NULL) { flags &= ~IP_ROUTETOIF; ro = state.ro; } } else ro = state.ro; dst = (struct sockaddr_in *)state.dst; if (error) { /* mbuf is already reclaimed in ipsec4_output. */ m0 = NULL; switch (error) { case EHOSTUNREACH: case ENETUNREACH: case EMSGSIZE: case ENOBUFS: case ENOMEM: break; default: printf("ip4_output (ipsec): error code %d\n", error); /*fall through*/ case ENOENT: /* don't show these error codes to the user */ error = 0; break; } KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 4,0,0,0,0); goto bad; } } /* be sure to update variables that are affected by ipsec4_output() */ ip = mtod(m, struct ip *); #ifdef _IP_VHL hlen = IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif /* Check that there wasn't a route change and src is still valid */ lck_mtx_lock(rt_mtx); if (ro->ro_rt && ro->ro_rt->generation_id != route_generation) { if (ifa_foraddr(ip->ip_src.s_addr) == 0 && ((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0)) { error = EADDRNOTAVAIL; lck_mtx_unlock(rt_mtx); KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 5,0,0,0,0); goto bad; } rtfree_locked(ro->ro_rt); ro->ro_rt = NULL; } if (ro->ro_rt == NULL) { if ((flags & IP_ROUTETOIF) == 0) { printf("ip_output: " "can't update route after IPsec processing\n"); error = EHOSTUNREACH; /*XXX*/ lck_mtx_unlock(rt_mtx); KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 6,0,0,0,0); goto bad; } } else { if (ia) ifafree(&ia->ia_ifa); ia = ifatoia(ro->ro_rt->rt_ifa); if (ia) ifaref(&ia->ia_ifa); ifp = ro->ro_rt->rt_ifp; } lck_mtx_unlock(rt_mtx); /* make it flipped, again. */ NTOHS(ip->ip_len); NTOHS(ip->ip_off); 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; ipf_ref(); /* 4135317 - always pass network byte order to filter */ HTONS(ip->ip_len); HTONS(ip->ip_off); 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 *); NTOHS(ip->ip_len); NTOHS(ip->ip_off); 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; 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; args.m = m; args.next_hop = dst; args.oif = ifp; off = ip_fw_chk_ptr(&args); m = args.m; dst = args.next_hop; /* * On return we must do the following: * IP_FW_PORT_DENY_FLAG -> drop the pkt (XXX new) * 1<=off<= 0xffff -> DIVERT * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet * dst != old -> IPFIREWALL_FORWARD * off==0, dst==old -> accept * If some of the above modules is not compiled in, then * we should't have to check the corresponding condition * (because the ipfw control socket should not accept * unsupported rules), but better play safe and drop * packets in case of doubt. */ m0 = m; if ( (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; 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; /* 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 */ HTONS(ip->ip_len); HTONS(ip->ip_off); /* 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. */ 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; } if (ia) { /* 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(struct sockaddr_in), 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 (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); } HTONS(ip->ip_len); HTONS(ip->ip_off); /* 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 = 0; lck_mtx_lock(rt_mtx); rtalloc_ign_locked(ro_fwd, RTF_PRCLONING); if (ro_fwd->ro_rt == 0) { OSAddAtomic(1, (SInt32*)&ipstat.ips_noroute); error = EHOSTUNREACH; lck_mtx_unlock(rt_mtx); goto bad; } ia_fw = ifatoia(ro_fwd->ro_rt->rt_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 isbroadcast = in_broadcast(dst->sin_addr, ifp); rtfree_locked(ro->ro_rt); ro->ro_rt = ro_fwd->ro_rt; dst = (struct sockaddr_in *)&ro_fwd->ro_dst; lck_mtx_unlock(rt_mtx); /* * 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_fw)->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 /* 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, (SInt32*)&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; 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 * care of the fragmentation for us, can just send directly. */ if ((u_short)ip->ip_len <= ifp->if_mtu || ifp->if_hwassist & CSUM_FRAGMENT) { struct rtentry *rte; HTONS(ip->ip_len); HTONS(ip->ip_off); ip->ip_sum = 0; if (sw_csum & CSUM_DELAY_IP) { ip->ip_sum = in_cksum(m, hlen); } #ifndef __APPLE__ /* Record statistics for this interface address. */ if (!(flags & IP_FORWARDING) && ia != NULL) { ia->ia_ifa.if_opackets++; ia->ia_ifa.if_obytes += m->m_pkthdr.len; } #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) { lck_mtx_lock(rt_mtx); if ((rte = ro->ro_rt) != NULL) rtref(rte); lck_mtx_unlock(rt_mtx); error = ifnet_output(ifp, PF_INET, m, rte, (struct sockaddr *)dst); if (rte != NULL) rtfree(rte); goto done; } else { /* packet chaining allows us to reuse the route for all packets */ m = m->m_nextpkt; if (m == NULL) { if (pktcnt > ip_maxchainsent) ip_maxchainsent = pktcnt; lck_mtx_lock(rt_mtx); if ((rte = ro->ro_rt) != NULL) rtref(rte); lck_mtx_unlock(rt_mtx); //send error = ifnet_output(ifp, PF_INET, packetlist, rte, (struct sockaddr *)dst); if (rte != NULL) rtfree(rte); 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) { 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. */ lck_mtx_lock(rt_mtx); 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; } lck_mtx_unlock(rt_mtx); OSAddAtomic(1, (SInt32*)&ipstat.ips_cantfrag); goto bad; } len = (ifp->if_mtu - hlen) &~ 7; if (len < 8) { error = EMSGSIZE; 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); m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; } { int mhlen, firstlen = len; struct mbuf **mnext = &m->m_nextpkt; int nfrags = 1; /* * Loop through length of segment after first fragment, * make new header and copy data of each part and link onto chain. */ m0 = m; mhlen = sizeof (struct ip); for (off = hlen + len; off < (u_short)ip->ip_len; off += len) { MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (m == 0) { error = ENOBUFS; OSAddAtomic(1, (SInt32*)&ipstat.ips_odropped); goto sendorfree; } m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG; m->m_data += max_linkhdr; mhip = mtod(m, struct ip *); *mhip = *ip; if (hlen > sizeof (struct ip)) { mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2); } m->m_len = mhlen; mhip->ip_off = ((off - hlen) >> 3) + (ip->ip_off & ~IP_MF); if (ip->ip_off & IP_MF) mhip->ip_off |= IP_MF; if (off + len >= (u_short)ip->ip_len) len = (u_short)ip->ip_len - off; else mhip->ip_off |= IP_MF; mhip->ip_len = htons((u_short)(len + mhlen)); m->m_next = m_copy(m0, off, len); if (m->m_next == 0) { (void) m_free(m); error = ENOBUFS; /* ??? */ OSAddAtomic(1, (SInt32*)&ipstat.ips_odropped); goto sendorfree; } m->m_pkthdr.len = mhlen + len; 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 HTONS(mhip->ip_off); mhip->ip_sum = 0; if (sw_csum & CSUM_DELAY_IP) { mhip->ip_sum = in_cksum(m, mhlen); } *mnext = m; mnext = &m->m_nextpkt; nfrags++; } OSAddAtomic(nfrags, (SInt32*)&ipstat.ips_ofragments); /* set first/last markers for fragment chain */ m->m_flags |= M_LASTFRAG; m0->m_flags |= M_FIRSTFRAG | M_FRAG; m0->m_pkthdr.csum_data = nfrags; /* * Update first fragment by trimming what's been copied out * and updating header, then send each fragment (in order). */ m = m0; 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 |= IP_MF; HTONS(ip->ip_off); ip->ip_sum = 0; if (sw_csum & CSUM_DELAY_IP) { ip->ip_sum = in_cksum(m, hlen); } sendorfree: 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) { struct rtentry *rte; #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); lck_mtx_lock(rt_mtx); if ((rte = ro->ro_rt) != NULL) rtref(rte); lck_mtx_unlock(rt_mtx); error = ifnet_output(ifp, PF_INET, m, rte, (struct sockaddr *)dst); if (rte != NULL) rtfree(rte); } else m_freem(m); } if (error == 0) OSAddAtomic(1, (SInt32*)&ipstat.ips_fragmented); } 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; } static void ip_out_cksum_stats(int proto, u_int32_t len) { switch (proto) { case IPPROTO_TCP: tcp_out_cksum_stats(len); break; case IPPROTO_UDP: udp_out_cksum_stats(len); break; default: /* keep only TCP or UDP stats for now */ break; } } void in_delayed_cksum_offset(struct mbuf *m0, int ip_offset) { struct ip *ip; unsigned char buf[sizeof(struct ip)]; u_short csum, offset, ip_len; 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; } } /* 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: %ld 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); } /* Gross */ if (ip_offset) { m->m_len -= ip_offset; m->m_data += ip_offset; } offset = IP_VHL_HL(ip->ip_vhl) << 2 ; /* * We could be in the context of an IP or interface filter; in the * former case, ip_len would be in host (correct) order while for * the latter it would be in network order. Because of this, we * attempt to interpret the length field by comparing it against * the actual packet length. If the comparison fails, byte swap * the length and check again. If it still fails, then the packet * is bogus and we give up. */ ip_len = ip->ip_len; if (ip_len != (m0->m_pkthdr.len - ip_offset)) { 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; /* 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: %ld 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) { in_delayed_cksum_offset(m, 0); } 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) { #if DEBUG printf("in_cksum_offset - delayed m_pullup, m->len: %ld off: %lu\n", m->m_len, ip_offset); #endif m_copydata(m, ip_offset, sizeof(struct ip), (caddr_t) buf); 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; } #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; } } ip->ip_sum = 0; ip->ip_sum = in_cksum(m, hlen); if (swapped) ip->ip_len = SWAP16(ip->ip_len); /* Gross */ if (ip_offset) { if (M_LEADINGSPACE(m) < ip_offset) panic("in_cksum_offset - chain modified!\n"); m->m_len += ip_offset; m->m_data -= ip_offset; } /* Insert the checksum in the existing chain if IP header not contiguous */ if (ip_offset + sizeof(struct ip) > m->m_len) { char tmp[2]; #if DEBUG printf("in_cksum_offset m_copyback, m->len: %lu 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); } } /* * Insert IP options into preformed packet. * Adjust IP destination as required for IP source routing, * as indicated by a non-zero in_addr at the start of the options. * * XXX This routine assumes that the packet has no options in place. */ static struct mbuf * ip_insertoptions(m, opt, phlen) register struct mbuf *m; struct mbuf *opt; int *phlen; { register struct ipoption *p = mtod(opt, struct ipoption *); struct mbuf *n; register struct ip *ip = mtod(m, struct ip *); unsigned optlen; optlen = opt->m_len - sizeof(p->ipopt_dst); if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) return (m); /* XXX should fail */ if (p->ipopt_dst.s_addr) ip->ip_dst = p->ipopt_dst; if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { MGETHDR(n, M_DONTWAIT, MT_HEADER); /* 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); n->m_next = m; m = n; m->m_len = optlen + sizeof(struct ip); m->m_data += max_linkhdr; (void)memcpy(mtod(m, void *), ip, sizeof(struct ip)); } else { m->m_data -= optlen; m->m_len += optlen; m->m_pkthdr.len += optlen; ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); } ip = mtod(m, struct ip *); bcopy(p->ipopt_list, ip + 1, optlen); *phlen = sizeof(struct ip) + optlen; ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2); ip->ip_len += optlen; return (m); } /* * Copy options from ip to jp, * omitting those not copied during fragmentation. */ int ip_optcopy(ip, jp) struct ip *ip, *jp; { register u_char *cp, *dp; int opt, optlen, cnt; cp = (u_char *)(ip + 1); dp = (u_char *)(jp + 1); cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip); for (; cnt > 0; cnt -= optlen, cp += optlen) { opt = cp[0]; if (opt == IPOPT_EOL) break; if (opt == IPOPT_NOP) { /* Preserve for IP mcast tunnel's LSRR alignment. */ *dp++ = IPOPT_NOP; optlen = 1; continue; } #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; if (IPOPT_COPIED(opt)) { bcopy(cp, dp, optlen); dp += optlen; } } for (optlen = dp - (u_char *)(jp+1); optlen & 0x3; optlen++) *dp++ = IPOPT_EOL; return (optlen); } /* * IP socket option processing. */ int ip_ctloutput(so, sopt) struct socket *so; struct sockopt *sopt; { struct inpcb *inp = sotoinpcb(so); int error, optval; error = optval = 0; if (sopt->sopt_level != IPPROTO_IP) { return (EINVAL); } switch (sopt->sopt_dir) { case SOPT_SET: switch (sopt->sopt_name) { case IP_OPTIONS: #ifdef notyet case IP_RETOPTS: #endif { struct mbuf *m; if (sopt->sopt_valsize > MLEN) { error = EMSGSIZE; break; } MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER); if (m == 0) { error = ENOBUFS; break; } m->m_len = sopt->sopt_valsize; error = sooptcopyin(sopt, mtod(m, char *), m->m_len, m->m_len); if (error) break; return (ip_pcbopts(sopt->sopt_name, &inp->inp_options, m)); } case IP_TOS: case IP_TTL: case IP_RECVOPTS: 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) break; switch (sopt->sopt_name) { case IP_TOS: inp->inp_ip_tos = optval; break; case IP_TTL: inp->inp_ip_ttl = optval; break; #define OPTSET(bit) \ if (optval) \ inp->inp_flags |= bit; \ else \ inp->inp_flags &= ~bit; case IP_RECVOPTS: OPTSET(INP_RECVOPTS); break; case IP_RECVRETOPTS: OPTSET(INP_RECVRETOPTS); break; case IP_RECVDSTADDR: OPTSET(INP_RECVDSTADDR); break; case IP_RECVIF: 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 case IP_FORCE_OUT_IFP: { char ifname[IFNAMSIZ]; ifnet_t ifp; /* Verify interface name parameter is sane */ if (sopt->sopt_valsize > sizeof(ifname)) { error = EINVAL; break; } /* Copy the interface name */ if (sopt->sopt_valsize != 0) { error = sooptcopyin(sopt, ifname, sizeof(ifname), sopt->sopt_valsize); if (error) break; } if (sopt->sopt_valsize == 0 || ifname[0] == 0) { // Set pdp_ifp to NULL inp->pdp_ifp = NULL; // Flush the route if (inp->inp_route.ro_rt) { rtfree(inp->inp_route.ro_rt); inp->inp_route.ro_rt = NULL; } break; } /* Verify name is NULL terminated */ if (ifname[sopt->sopt_valsize - 1] != 0) { error = EINVAL; break; } if (ifnet_find_by_name(ifname, &ifp) != 0) { error = ENXIO; break; } /* Won't actually free. Since we don't release this later, we should do it now. */ ifnet_release(ifp); /* This only works for point-to-point interfaces */ if ((ifp->if_flags & IFF_POINTOPOINT) == 0) { error = ENOTSUP; break; } inp->pdp_ifp = ifp; } break; #endif case IP_MULTICAST_IF: case IP_MULTICAST_VIF: case IP_MULTICAST_TTL: case IP_MULTICAST_LOOP: case IP_ADD_MEMBERSHIP: case IP_DROP_MEMBERSHIP: error = ip_setmoptions(sopt, &inp->inp_moptions); break; case IP_PORTRANGE: error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); if (error) break; switch (optval) { case IP_PORTRANGE_DEFAULT: inp->inp_flags &= ~(INP_LOWPORT); inp->inp_flags &= ~(INP_HIGHPORT); break; case IP_PORTRANGE_HIGH: inp->inp_flags &= ~(INP_LOWPORT); inp->inp_flags |= INP_HIGHPORT; break; case IP_PORTRANGE_LOW: inp->inp_flags &= ~(INP_HIGHPORT); inp->inp_flags |= INP_LOWPORT; break; default: error = EINVAL; break; } break; #if IPSEC case IP_IPSEC_POLICY: { caddr_t req = NULL; size_t len = 0; int priv; struct mbuf *m; int optname; if (sopt->sopt_valsize > MCLBYTES) { error = EMSGSIZE; break; } if ((error = soopt_getm(sopt, &m)) != 0) /* XXX */ break; if ((error = soopt_mcopyin(sopt, m)) != 0) /* XXX */ break; priv = (sopt->sopt_p != NULL && proc_suser(sopt->sopt_p) != 0) ? 0 : 1; if (m) { req = mtod(m, caddr_t); len = m->m_len; } optname = sopt->sopt_name; error = ipsec4_set_policy(inp, optname, req, len, priv); m_freem(m); break; } #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) so->so_traffic_mgt_flags |= TRAFFIC_MGT_SO_BACKGROUND; else so->so_traffic_mgt_flags &= ~TRAFFIC_MGT_SO_BACKGROUND; break; } #endif /* TRAFFIC_MGT */ default: error = ENOPROTOOPT; break; } break; case SOPT_GET: switch (sopt->sopt_name) { case IP_OPTIONS: case IP_RETOPTS: if (inp->inp_options) error = sooptcopyout(sopt, mtod(inp->inp_options, char *), inp->inp_options->m_len); else sopt->sopt_valsize = 0; break; case IP_TOS: case IP_TTL: case IP_RECVOPTS: 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 = inp->inp_ip_tos; break; case IP_TTL: optval = inp->inp_ip_ttl; break; #define OPTBIT(bit) (inp->inp_flags & bit ? 1 : 0) case IP_RECVOPTS: optval = OPTBIT(INP_RECVOPTS); break; case IP_RECVRETOPTS: optval = OPTBIT(INP_RECVRETOPTS); break; case IP_RECVDSTADDR: optval = OPTBIT(INP_RECVDSTADDR); break; case IP_RECVIF: 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; else if (inp->inp_flags & INP_LOWPORT) optval = IP_PORTRANGE_LOW; else 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_MULTICAST_IF: case IP_MULTICAST_VIF: case IP_MULTICAST_TTL: case IP_MULTICAST_LOOP: case IP_ADD_MEMBERSHIP: case IP_DROP_MEMBERSHIP: error = ip_getmoptions(sopt, inp->inp_moptions); break; #if IPSEC case IP_IPSEC_POLICY: { struct mbuf *m = NULL; caddr_t req = NULL; size_t len = 0; if (m != 0) { req = mtod(m, caddr_t); len = m->m_len; } error = ipsec4_get_policy(sotoinpcb(so), req, len, &m); if (error == 0) error = soopt_mcopyout(sopt, m); /* XXX */ if (error == 0) m_freem(m); 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 */ default: error = ENOPROTOOPT; break; } break; } return (error); } /* * Set up IP options in pcb for insertion in output packets. * Store in mbuf with pointer in pcbopt, adding pseudo-option * with destination address if source routed. */ static int ip_pcbopts( __unused int optname, struct mbuf **pcbopt, register struct mbuf *m) { register int cnt, optlen; register u_char *cp; u_char opt; /* turn off any old options */ if (*pcbopt) (void)m_free(*pcbopt); *pcbopt = 0; if (m == (struct mbuf *)0 || m->m_len == 0) { /* * Only turning off any previous options. */ if (m) (void)m_free(m); return (0); } #ifndef vax if (m->m_len % sizeof(int32_t)) goto bad; #endif /* * IP first-hop destination address will be stored before * actual options; move other options back * and clear it when none present. */ if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) goto bad; cnt = m->m_len; m->m_len += sizeof(struct in_addr); cp = mtod(m, u_char *) + sizeof(struct in_addr); ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt); bzero(mtod(m, caddr_t), sizeof(struct in_addr)); for (; cnt > 0; cnt -= optlen, cp += optlen) { opt = cp[IPOPT_OPTVAL]; if (opt == IPOPT_EOL) break; if (opt == IPOPT_NOP) optlen = 1; else { if (cnt < IPOPT_OLEN + sizeof(*cp)) goto bad; optlen = cp[IPOPT_OLEN]; if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) goto bad; } switch (opt) { default: break; case IPOPT_LSRR: case IPOPT_SSRR: /* * user process specifies route as: * ->A->B->C->D * D must be our final destination (but we can't * check that since we may not have connected yet). * A is first hop destination, which doesn't appear in * actual IP option, but is stored before the options. */ if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) goto bad; m->m_len -= sizeof(struct in_addr); cnt -= sizeof(struct in_addr); optlen -= sizeof(struct in_addr); cp[IPOPT_OLEN] = optlen; /* * Move first hop before start of options. */ bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), sizeof(struct in_addr)); /* * Then copy rest of options back * to close up the deleted entry. */ ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] + sizeof(struct in_addr)), (caddr_t)&cp[IPOPT_OFFSET+1], (unsigned)cnt + sizeof(struct in_addr)); break; } } if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) goto bad; *pcbopt = m; return (0); bad: (void)m_free(m); return (EINVAL); } /* * XXX * The whole multicast option thing needs to be re-thought. * Several of these options are equally applicable to non-multicast * transmission, and one (IP_MULTICAST_TTL) totally duplicates a * standard option (IP_TTL). */ /* * 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(). */ static int ip_setmoptions(sopt, imop) struct sockopt *sopt; struct ip_moptions **imop; { int error = 0; int i; struct in_addr addr; struct ip_mreq mreq; struct ifnet *ifp = NULL; struct ip_moptions *imo = *imop; int ifindex; if (imo == NULL) { /* * No multicast option buffer attached to the pcb; * allocate one and initialize to default values. */ error = ip_createmoptions(imop); if (error != 0) return error; imo = *imop; } switch (sopt->sopt_name) { /* store an index number for the vif you wanna use in the send */ #if MROUTING case IP_MULTICAST_VIF: if (legal_vif_num == 0) { error = EOPNOTSUPP; break; } error = sooptcopyin(sopt, &i, sizeof i, sizeof i); if (error) break; if (!legal_vif_num(i) && (i != -1)) { error = EINVAL; break; } imo->imo_multicast_vif = i; break; #endif /* MROUTING */ case IP_MULTICAST_IF: /* * Select the interface for outgoing multicast packets. */ error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr); if (error) break; /* * INADDR_ANY is used to remove a previous selection. * When no interface is selected, a default one is * chosen every time a multicast packet is sent. */ if (addr.s_addr == INADDR_ANY) { imo->imo_multicast_ifp = NULL; break; } /* * The selected interface is identified by its local * IP address. Find the interface and confirm that * it supports multicasting. */ ifp = ip_multicast_if(&addr, &ifindex); if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { error = EADDRNOTAVAIL; break; } imo->imo_multicast_ifp = ifp; if (ifindex) imo->imo_multicast_addr = addr; else imo->imo_multicast_addr.s_addr = INADDR_ANY; break; case IP_MULTICAST_TTL: /* * Set the IP time-to-live for outgoing multicast packets. * The original multicast API required a char argument, * which is inconsistent with the rest of the socket API. * We allow either a char or an int. */ if (sopt->sopt_valsize == 1) { u_char ttl; error = sooptcopyin(sopt, &ttl, 1, 1); if (error) break; imo->imo_multicast_ttl = ttl; } else { u_int ttl; error = sooptcopyin(sopt, &ttl, sizeof ttl, sizeof ttl); if (error) break; if (ttl > 255) error = EINVAL; else imo->imo_multicast_ttl = ttl; } break; case IP_MULTICAST_LOOP: /* * Set the loopback flag for outgoing multicast packets. * Must be zero or one. The original multicast API required a * char argument, which is inconsistent with the rest * of the socket API. We allow either a char or an int. */ if (sopt->sopt_valsize == 1) { u_char loop; error = sooptcopyin(sopt, &loop, 1, 1); if (error) break; imo->imo_multicast_loop = !!loop; } else { u_int loop; error = sooptcopyin(sopt, &loop, sizeof loop, sizeof loop); if (error) break; imo->imo_multicast_loop = !!loop; } break; case IP_ADD_MEMBERSHIP: /* * Add a multicast group membership. * Group must be a valid IP multicast address. */ error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); if (error) break; error = ip_addmembership(imo, &mreq); break; case IP_DROP_MEMBERSHIP: /* * Drop a multicast group membership. * Group must be a valid IP multicast address. */ error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); if (error) break; error = ip_dropmembership(imo, &mreq); break; default: error = EOPNOTSUPP; break; } /* * If all options have default values, no need to keep the mbuf. */ if (imo->imo_multicast_ifp == NULL && imo->imo_multicast_vif == (u_long)-1 && imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && imo->imo_num_memberships == 0) { FREE(*imop, M_IPMOPTS); *imop = NULL; } 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; if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { error = EINVAL; return error; } /* * 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; lck_mtx_lock(rt_mtx); rtalloc_ign_locked(&ro, 0UL); if (ro.ro_rt != NULL) { ifp = ro.ro_rt->rt_ifp; rtfree_locked(ro.ro_rt); } else { /* If there's no default route, try using loopback */ mreq->imr_interface.s_addr = INADDR_LOOPBACK; } lck_mtx_unlock(rt_mtx); } 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; return error; } /* * See if the membership already exists or if all the * membership slots are full. */ for (i = 0; i < imo->imo_num_memberships; ++i) { if (imo->imo_membership[i]->inm_ifp == ifp && imo->imo_membership[i]->inm_addr.s_addr == mreq->imr_multiaddr.s_addr) break; } if (i < imo->imo_num_memberships) { error = EADDRINUSE; return error; } if (i == IP_MAX_MEMBERSHIPS) { error = ETOOMANYREFS; return error; } /* * 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; return error; } ++imo->imo_num_memberships; 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(). */ static int ip_getmoptions(sopt, imo) struct sockopt *sopt; register struct ip_moptions *imo; { struct in_addr addr; struct in_ifaddr *ia; int error, optval; u_char coptval; error = 0; switch (sopt->sopt_name) { #if MROUTING case IP_MULTICAST_VIF: if (imo != NULL) optval = imo->imo_multicast_vif; else 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 if (imo->imo_multicast_addr.s_addr) { /* return the value user has set */ addr = imo->imo_multicast_addr; } else { IFP_TO_IA(imo->imo_multicast_ifp, ia); addr.s_addr = (ia == NULL) ? INADDR_ANY : IA_SIN(ia)->sin_addr.s_addr; } error = sooptcopyout(sopt, &addr, sizeof addr); break; case IP_MULTICAST_TTL: if (imo == 0) optval = coptval = IP_DEFAULT_MULTICAST_TTL; else optval = coptval = imo->imo_multicast_ttl; if (sopt->sopt_valsize == 1) error = sooptcopyout(sopt, &coptval, 1); else error = sooptcopyout(sopt, &optval, sizeof optval); break; case IP_MULTICAST_LOOP: if (imo == 0) optval = coptval = IP_DEFAULT_MULTICAST_LOOP; else optval = coptval = imo->imo_multicast_loop; if (sopt->sopt_valsize == 1) error = sooptcopyout(sopt, &coptval, 1); else error = sooptcopyout(sopt, &optval, sizeof optval); break; default: error = ENOPROTOOPT; break; } return (error); } /* * Discard the IP multicast options. */ void ip_freemoptions(imo) register struct ip_moptions *imo; { register int i; if (imo != NULL) { for (i = 0; i < imo->imo_num_memberships; ++i) in_delmulti(&imo->imo_membership[i]); FREE(imo, M_IPMOPTS); } } /* * Routine called from ip_output() to loop back a copy of an IP multicast * packet to the input queue of a specified interface. Note that this * calls the output routine of the loopback "driver", but with an interface * pointer that might NOT be a loopback interface -- evil, but easier than * replicating that code here. */ static void ip_mloopback(ifp, m, dst, hlen) struct ifnet *ifp; register struct mbuf *m; register struct sockaddr_in *dst; int hlen; { 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) 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 *); HTONS(ip->ip_len); HTONS(ip->ip_off); ip->ip_sum = 0; ip->ip_sum = in_cksum(copym, hlen); /* * NB: * It's not clear whether there are any lingering * reentrancy problems in other areas which might * be exposed by using ip_input directly (in * particular, everything which modifies the packet * in-place). Yet another option is using the * protosw directly to deliver the looped back * packet. For the moment, we'll err on the side * of safety by using if_simloop(). */ #if 1 /* XXX */ if (dst->sin_family != AF_INET) { printf("ip_mloopback: bad address family %d\n", dst->sin_family); dst->sin_family = AF_INET; } #endif /* * 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 { NTOHS(ip->ip_len); in_delayed_cksum(copym); HTONS(ip->ip_len); } } /* * 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); } } |