X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/5d5c5d0d5b79ade9a973d55186ffda2638ba2b6e..490019cf9519204c5fb36b2fba54ceb983bb6b72:/bsd/netinet/ip_output.c diff --git a/bsd/netinet/ip_output.c b/bsd/netinet/ip_output.c index 26be38674..2788b0e79 100644 --- a/bsd/netinet/ip_output.c +++ b/bsd/netinet/ip_output.c @@ -1,31 +1,29 @@ /* - * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved. + * Copyright (c) 2000-2014 Apple Inc. All rights reserved. * - * @APPLE_LICENSE_OSREFERENCE_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. + * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * - * Please obtain a copy of the License at - * http://www.opensource.apple.com/apsl/ 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. * - * 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 + * 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_LICENSE_OSREFERENCE_HEADER_END@ + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (c) 1982, 1986, 1988, 1990, 1993 @@ -60,10 +58,15 @@ * SUCH DAMAGE. * * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 - * $FreeBSD: src/sys/netinet/ip_output.c,v 1.99.2.16 2001/07/19 06:37:26 kris Exp $ + */ +/* + * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce + * support for mandatory and extensible security protections. This notice + * is included in support of clause 2.2 (b) of the Apple Public License, + * Version 2.0. */ -#define _IP_VHL +#define _IP_VHL #include #include @@ -75,9 +78,24 @@ #include #include #include +#include +#include + +#include +#include +#include + +#include +#include #include +#include +#include #include +#include +#include +#include +#include #include #include @@ -85,19 +103,16 @@ #include #include #include - #include -#include "faith.h" - -#include -#include - -#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 1) -#define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 3) -#define DBG_FNC_IP_OUTPUT NETDBG_CODE(DBG_NETIP, (1 << 8) | 1) -#define DBG_FNC_IPSEC4_OUTPUT NETDBG_CODE(DBG_NETIP, (2 << 8) | 1) +#if CONFIG_MACF_NET +#include +#endif /* CONFIG_MACF_NET */ +#define DBG_LAYER_BEG NETDBG_CODE(DBG_NETIP, 1) +#define DBG_LAYER_END NETDBG_CODE(DBG_NETIP, 3) +#define DBG_FNC_IP_OUTPUT NETDBG_CODE(DBG_NETIP, (1 << 8) | 1) +#define DBG_FNC_IPSEC4_OUTPUT NETDBG_CODE(DBG_NETIP, (2 << 8) | 1) #if IPSEC #include @@ -105,63 +120,124 @@ #if IPSEC_DEBUG #include #else -#define KEYDEBUG(lev,arg) +#define KEYDEBUG(lev, arg) #endif -#endif /*IPSEC*/ +#endif /* IPSEC */ + +#if NECP +#include +#endif /* NECP */ +#if IPFIREWALL #include +#if IPDIVERT #include +#endif /* IPDIVERT */ +#endif /* IPFIREWALL */ #if DUMMYNET #include #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 +#if PF +#include +#endif /* PF */ -#if IPSEC -extern lck_mtx_t *sadb_mutex; -#endif +#if IPFIREWALL_FORWARD && IPFIREWALL_FORWARD_DEBUG +#define print_ip(a) \ + printf("%ld.%ld.%ld.%ld", (ntohl(a.s_addr) >> 24) & 0xFF, \ + (ntohl(a.s_addr) >> 16) & 0xFF, \ + (ntohl(a.s_addr) >> 8) & 0xFF, \ + (ntohl(a.s_addr)) & 0xFF); +#endif /* IPFIREWALL_FORWARD && IPFIREWALL_FORWARD_DEBUG */ u_short ip_id; +static int sysctl_reset_ip_output_stats SYSCTL_HANDLER_ARGS; +static int sysctl_ip_output_measure_bins SYSCTL_HANDLER_ARGS; +static int sysctl_ip_output_getperf SYSCTL_HANDLER_ARGS; +static void ip_out_cksum_stats(int, u_int32_t); static struct mbuf *ip_insertoptions(struct mbuf *, struct mbuf *, int *); -static 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 **); - -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 *); -extern int (*fr_checkp)(struct ip *, int, struct ifnet *, int, struct mbuf **); -#ifdef __APPLE__ -extern struct mbuf* m_dup(register struct mbuf *m, int how); -#endif - -extern int apple_hwcksum_tx; -extern u_long route_generation; - -extern struct protosw inetsw[]; +static int ip_optcopy(struct ip *, struct ip *); +static int ip_pcbopts(int, struct mbuf **, struct mbuf *); +static void imo_trace(struct ip_moptions *, int); +static void ip_mloopback(struct ifnet *, struct ifnet *, struct mbuf *, + struct sockaddr_in *, int); +static struct ifaddr *in_selectsrcif(struct ip *, struct route *, unsigned int); extern struct ip_linklocal_stat ip_linklocal_stat; -extern 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"); +static int ip_maxchainsent = 0; +SYSCTL_INT(_net_inet_ip, OID_AUTO, maxchainsent, + CTLFLAG_RW | CTLFLAG_LOCKED, &ip_maxchainsent, 0, + "use dlil_output_list"); +#if DEBUG +static int forge_ce = 0; +SYSCTL_INT(_net_inet_ip, OID_AUTO, forge_ce, + CTLFLAG_RW | CTLFLAG_LOCKED, &forge_ce, 0, + "Forge ECN CE"); +#endif /* DEBUG */ + +static int ip_select_srcif_debug = 0; +SYSCTL_INT(_net_inet_ip, OID_AUTO, select_srcif_debug, + CTLFLAG_RW | CTLFLAG_LOCKED, &ip_select_srcif_debug, 0, + "log source interface selection debug info"); + +static int ip_output_measure = 0; +SYSCTL_PROC(_net_inet_ip, OID_AUTO, output_perf, + CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, + &ip_output_measure, 0, sysctl_reset_ip_output_stats, "I", + "Do time measurement"); + +static uint64_t ip_output_measure_bins = 0; +SYSCTL_PROC(_net_inet_ip, OID_AUTO, output_perf_bins, + CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &ip_output_measure_bins, 0, + sysctl_ip_output_measure_bins, "I", + "bins for chaining performance data histogram"); + +static net_perf_t net_perf; +SYSCTL_PROC(_net_inet_ip, OID_AUTO, output_perf_data, + CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, + 0, 0, sysctl_ip_output_getperf, "S,net_perf", + "IP output performance data (struct net_perf, net/net_perf.h)"); + +#define IMO_TRACE_HIST_SIZE 32 /* size of trace history */ + +/* For gdb */ +__private_extern__ unsigned int imo_trace_hist_size = IMO_TRACE_HIST_SIZE; + +struct ip_moptions_dbg { + struct ip_moptions imo; /* ip_moptions */ + u_int16_t imo_refhold_cnt; /* # of IMO_ADDREF */ + u_int16_t imo_refrele_cnt; /* # of IMO_REMREF */ + /* + * Alloc and free callers. + */ + ctrace_t imo_alloc; + ctrace_t imo_free; + /* + * Circular lists of IMO_ADDREF and IMO_REMREF callers. + */ + ctrace_t imo_refhold[IMO_TRACE_HIST_SIZE]; + ctrace_t imo_refrele[IMO_TRACE_HIST_SIZE]; +}; + +#if DEBUG +static unsigned int imo_debug = 1; /* debugging (enabled) */ +#else +static unsigned int imo_debug; /* debugging (disabled) */ +#endif /* !DEBUG */ +static unsigned int imo_size; /* size of zone element */ +static struct zone *imo_zone; /* zone for ip_moptions */ + +#define IMO_ZONE_MAX 64 /* maximum elements in zone */ +#define IMO_ZONE_NAME "ip_moptions" /* zone name */ + /* * IP output. The packet in mbuf chain m contains a skeletal IP * header (with len, off, ttl, proto, tos, src, dst). @@ -169,165 +245,361 @@ SYSCTL_INT(_net_inet_ip, OID_AUTO, maxchainsent, CTLFLAG_RW, * 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) +ip_output(struct mbuf *m0, struct mbuf *opt, struct route *ro, int flags, + struct ip_moptions *imo, struct ip_out_args *ipoa) { - int error; - error = ip_output_list(m0, 0, opt, ro, flags, imo); - return error; + return (ip_output_list(m0, 0, opt, ro, flags, imo, ipoa)); } +/* + * IP output. The packet in mbuf chain m contains a skeletal IP + * header (with len, off, ttl, proto, tos, src, dst). + * The mbuf chain containing the packet will be freed. + * The mbuf opt, if present, will not be freed. + * + * Route ro MUST be non-NULL; if ro->ro_rt is valid, route lookup would be + * skipped and ro->ro_rt would be used. Otherwise the result of route + * lookup is stored in ro->ro_rt. + * + * In the IP forwarding case, the packet will arrive with options already + * inserted, so must have a NULL opt pointer. + */ int -ip_output_list( - struct mbuf *m0, - int packetchain, - struct mbuf *opt, - struct route *ro, - int flags, - struct ip_moptions *imo) +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, *mhip; - struct ifnet *ifp = NULL; - struct mbuf *m = m0; + struct ip *ip; + struct ifnet *ifp = NULL; /* not refcnt'd */ + struct mbuf *m = m0, *prevnxt = NULL, **mppn = &prevnxt; int hlen = sizeof (struct ip); - int len, off, error = 0; + int len = 0, error = 0; struct sockaddr_in *dst = NULL; - struct in_ifaddr *ia = NULL; - int isbroadcast, sw_csum; + struct in_ifaddr *ia = NULL, *src_ia = NULL; struct in_addr pkt_dst; + struct ipf_pktopts *ippo = NULL; + ipfilter_t inject_filter_ref = NULL; + struct mbuf *packetlist; + uint32_t sw_csum, pktcnt = 0, scnt = 0, bytecnt = 0; + uint32_t packets_processed = 0; + unsigned int ifscope = IFSCOPE_NONE; + struct flowadv *adv = NULL; + struct timeval start_tv; #if IPSEC - struct route iproute; struct socket *so = NULL; struct secpolicy *sp = NULL; -#endif +#endif /* IPSEC */ +#if NECP + necp_kernel_policy_result necp_result = 0; + necp_kernel_policy_result_parameter necp_result_parameter; + necp_kernel_policy_id necp_matched_policy_id = 0; +#endif /* NECP */ +#if IPFIREWALL + int ipfwoff; + struct sockaddr_in *next_hop_from_ipfwd_tag = NULL; +#endif /* IPFIREWALL */ +#if IPFIREWALL || DUMMYNET + struct m_tag *tag; +#endif /* IPFIREWALL || DUMMYNET */ +#if DUMMYNET + struct ip_out_args saved_ipoa; + struct sockaddr_in dst_buf; +#endif /* DUMMYNET */ + struct { +#if IPSEC + struct ipsec_output_state ipsec_state; +#endif /* IPSEC */ +#if NECP + struct route necp_route; +#endif /* NECP */ +#if IPFIREWALL || DUMMYNET + struct ip_fw_args args; +#endif /* IPFIREWALL || DUMMYNET */ #if IPFIREWALL_FORWARD - int fwd_rewrite_src = 0; -#endif - struct ip_fw_args args; - int didfilter = 0; - ipfilter_t inject_filter_ref = 0; - struct m_tag *tag; - struct route dn_route; - struct mbuf * packetlist; - int pktcnt = 0; - - lck_mtx_lock(ip_mutex); + struct route sro_fwd; +#endif /* IPFIREWALL_FORWARD */ +#if DUMMYNET + struct route saved_route; +#endif /* DUMMYNET */ + struct ipf_pktopts ipf_pktopts; + } ipobz; +#define ipsec_state ipobz.ipsec_state +#define necp_route ipobz.necp_route +#define args ipobz.args +#define sro_fwd ipobz.sro_fwd +#define saved_route ipobz.saved_route +#define ipf_pktopts ipobz.ipf_pktopts + union { + struct { + boolean_t select_srcif : 1; /* set once */ + boolean_t srcbound : 1; /* set once */ + boolean_t nocell : 1; /* set once */ + boolean_t isbroadcast : 1; + boolean_t didfilter : 1; + boolean_t noexpensive : 1; /* set once */ + boolean_t awdl_unrestricted : 1; /* set once */ +#if IPFIREWALL_FORWARD + boolean_t fwd_rewrite_src : 1; +#endif /* IPFIREWALL_FORWARD */ + }; + uint32_t raw; + } ipobf = { .raw = 0 }; - KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_START, 0,0,0,0,0); +#define IP_CHECK_RESTRICTIONS(_ifp, _ipobf) \ + (((_ipobf).nocell && IFNET_IS_CELLULAR(_ifp)) || \ + ((_ipobf).noexpensive && IFNET_IS_EXPENSIVE(_ifp)) || \ + (!(_ipobf).awdl_unrestricted && IFNET_IS_AWDL_RESTRICTED(_ifp))) + if (ip_output_measure) + net_perf_start_time(&net_perf, &start_tv); + KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_START, 0, 0, 0, 0, 0); + + VERIFY(m0->m_flags & M_PKTHDR); packetlist = m0; - args.eh = NULL; - args.rule = NULL; - args.next_hop = NULL; - args.divert_rule = 0; /* divert cookie */ - + + /* zero out {ipsec_state, args, sro_fwd, saved_route, ipf_pktops} */ + bzero(&ipobz, sizeof (ipobz)); + ippo = &ipf_pktopts; + +#if IPFIREWALL || DUMMYNET + if (SLIST_EMPTY(&m0->m_pkthdr.tags)) + goto ipfw_tags_done; + /* Grab info from mtags prepended to the chain */ #if DUMMYNET - if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) { + 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; + args.fwa_ipfw_rule = dn_tag->dn_ipfw_rule; + args.fwa_pf_rule = dn_tag->dn_pf_rule; opt = NULL; - dn_route = dn_tag->ro; - ro = &dn_route; - + saved_route = dn_tag->dn_ro; + ro = &saved_route; + imo = NULL; - dst = dn_tag->dn_dst; - ifp = dn_tag->ifp; - flags = dn_tag->flags; - + bcopy(&dn_tag->dn_dst, &dst_buf, sizeof (dst_buf)); + dst = &dst_buf; + ifp = dn_tag->dn_ifp; + flags = dn_tag->dn_flags; + if ((dn_tag->dn_flags & IP_OUTARGS)) { + saved_ipoa = dn_tag->dn_ipoa; + ipoa = &saved_ipoa; + } + m_tag_delete(m0, tag); } #endif /* DUMMYNET */ - if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_DIVERT, NULL)) != NULL) { +#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; + args.fwa_divert_rule = div_tag->cookie; m_tag_delete(m0, tag); } - if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_IPFORWARD, NULL)) != NULL) { +#endif /* IPDIVERT */ + +#if IPFIREWALL + if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID, + KERNEL_TAG_TYPE_IPFORWARD, NULL)) != NULL) { struct ip_fwd_tag *ipfwd_tag; - + ipfwd_tag = (struct ip_fwd_tag *)(tag+1); - args.next_hop = ipfwd_tag->next_hop; - + next_hop_from_ipfwd_tag = ipfwd_tag->next_hop; + m_tag_delete(m0, tag); } +#endif /* IPFIREWALL */ + +ipfw_tags_done: +#endif /* IPFIREWALL || DUMMYNET */ m = m0; - -#if DIAGNOSTIC - if ( !m || (m->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 + m->m_pkthdr.pkt_flags &= ~(PKTF_LOOP|PKTF_IFAINFO); - 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) - ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa; - if (ia) - ifaref(&ia->ia_ifa); #if IPSEC - if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) { - so = ipsec_getsocket(m); - (void)ipsec_setsocket(m, NULL); - } -#endif - goto sendit; + if (ipsec_bypass == 0 && !(flags & IP_NOIPSEC)) { + /* If packet is bound to an interface, check bound policies */ + if ((flags & IP_OUTARGS) && (ipoa != NULL) && + (ipoa->ipoa_flags & IPOAF_BOUND_IF) && + ipoa->ipoa_boundif != IFSCOPE_NONE) { + if (ipsec4_getpolicybyinterface(m, IPSEC_DIR_OUTBOUND, + &flags, ipoa, &sp) != 0) + goto bad; + } + } +#endif /* IPSEC */ + + VERIFY(ro != NULL); + + if (ip_doscopedroute && (flags & IP_OUTARGS)) { + /* + * In the forwarding case, only the ifscope value is used, + * as source interface selection doesn't take place. + */ + if ((ipobf.select_srcif = (!(flags & IP_FORWARDING) && + (ipoa->ipoa_flags & IPOAF_SELECT_SRCIF)))) { + ipf_pktopts.ippo_flags |= IPPOF_SELECT_SRCIF; + } + + if ((ipoa->ipoa_flags & IPOAF_BOUND_IF) && + ipoa->ipoa_boundif != IFSCOPE_NONE) { + ifscope = ipoa->ipoa_boundif; + ipf_pktopts.ippo_flags |= + (IPPOF_BOUND_IF | (ifscope << IPPOF_SHIFT_IFSCOPE)); + } + + /* double negation needed for bool bit field */ + ipobf.srcbound = !!(ipoa->ipoa_flags & IPOAF_BOUND_SRCADDR); + if (ipobf.srcbound) + ipf_pktopts.ippo_flags |= IPPOF_BOUND_SRCADDR; + } else { + ipobf.select_srcif = FALSE; + ipobf.srcbound = FALSE; + ifscope = IFSCOPE_NONE; + if (flags & IP_OUTARGS) { + ipoa->ipoa_boundif = IFSCOPE_NONE; + ipoa->ipoa_flags &= ~(IPOAF_SELECT_SRCIF | + IPOAF_BOUND_IF | IPOAF_BOUND_SRCADDR); + } } + if (flags & IP_OUTARGS) { + if (ipoa->ipoa_flags & IPOAF_NO_CELLULAR) { + ipobf.nocell = TRUE; + ipf_pktopts.ippo_flags |= IPPOF_NO_IFT_CELLULAR; + } + if (ipoa->ipoa_flags & IPOAF_NO_EXPENSIVE) { + ipobf.noexpensive = TRUE; + ipf_pktopts.ippo_flags |= IPPOF_NO_IFF_EXPENSIVE; + } + if (ipoa->ipoa_flags & IPOAF_AWDL_UNRESTRICTED) + ipobf.awdl_unrestricted = TRUE; + adv = &ipoa->ipoa_flowadv; + adv->code = FADV_SUCCESS; + ipoa->ipoa_retflags = 0; + } + #if IPSEC - if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) { + if (ipsec_bypass == 0 && !(flags & IP_NOIPSEC)) { so = ipsec_getsocket(m); - (void)ipsec_setsocket(m, NULL); + if (so != NULL) { + (void) ipsec_setsocket(m, NULL); + } } -#endif -loopit: +#endif /* IPSEC */ + +#if DUMMYNET + if (args.fwa_ipfw_rule != NULL || args.fwa_pf_rule != NULL) { + /* dummynet already saw us */ + ip = mtod(m, struct ip *); + hlen = IP_VHL_HL(ip->ip_vhl) << 2; + pkt_dst = ip->ip_dst; + if (ro->ro_rt != NULL) { + RT_LOCK_SPIN(ro->ro_rt); + ia = (struct in_ifaddr *)ro->ro_rt->rt_ifa; + if (ia) { + /* Become a regular mutex */ + RT_CONVERT_LOCK(ro->ro_rt); + IFA_ADDREF(&ia->ia_ifa); + } + RT_UNLOCK(ro->ro_rt); + } + +#if IPFIREWALL + if (args.fwa_ipfw_rule != NULL) + goto skip_ipsec; +#endif /* IPFIREWALL */ + if (args.fwa_pf_rule != NULL) + goto sendit; + } +#endif /* DUMMYNET */ + +loopit: + packets_processed++; + ipobf.isbroadcast = FALSE; + ipobf.didfilter = FALSE; +#if IPFIREWALL_FORWARD + ipobf.fwd_rewrite_src = FALSE; +#endif /* IPFIREWALL_FORWARD */ + + VERIFY(m->m_flags & M_PKTHDR); /* - * No need to proccess packet twice if we've - * already seen it + * No need to proccess packet twice if we've already seen it. */ - inject_filter_ref = ipf_get_inject_filter(m); + if (!SLIST_EMPTY(&m->m_pkthdr.tags)) + inject_filter_ref = ipf_get_inject_filter(m); + else + inject_filter_ref = NULL; if (opt) { m = ip_insertoptions(m, opt, &len); hlen = len; + /* Update the chain */ + if (m != m0) { + if (m0 == packetlist) + packetlist = m; + m0 = m; + } } ip = mtod(m, struct ip *); - pkt_dst = args.next_hop ? args.next_hop->sin_addr : ip->ip_dst; + +#if IPFIREWALL + /* + * rdar://8542331 + * + * When dealing with a packet chain, we need to reset "next_hop" + * because "dst" may have been changed to the gateway address below + * for the previous packet of the chain. This could cause the route + * to be inavertandly changed to the route to the gateway address + * (instead of the route to the destination). + */ + args.fwa_next_hop = next_hop_from_ipfwd_tag; + pkt_dst = args.fwa_next_hop ? args.fwa_next_hop->sin_addr : ip->ip_dst; +#else /* !IPFIREWALL */ + pkt_dst = ip->ip_dst; +#endif /* !IPFIREWALL */ + + /* + * We must not send if the packet is destined to network zero. + * RFC1122 3.2.1.3 (a) and (b). + */ + if (IN_ZERONET(ntohl(pkt_dst.s_addr))) { + error = EHOSTUNREACH; + goto bad; + } /* * Fill in IP header. */ - if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) { + if (!(flags & (IP_FORWARDING|IP_RAWOUTPUT))) { ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2); ip->ip_off &= IP_DF; -#if RANDOM_IP_ID ip->ip_id = ip_randomid(); -#else - ip->ip_id = htons(ip_id++); -#endif - ipstat.ips_localout++; + OSAddAtomic(1, &ipstat.ips_localout); } else { hlen = IP_VHL_HL(ip->ip_vhl) << 2; } - KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr, - ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); +#if DEBUG + /* For debugging, we let the stack forge congestion */ + if (forge_ce != 0 && + ((ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_ECT1 || + (ip->ip_tos & IPTOS_ECN_MASK) == IPTOS_ECN_ECT0)) { + ip->ip_tos = (ip->ip_tos & ~IPTOS_ECN_MASK) | IPTOS_ECN_CE; + forge_ce--; + } +#endif /* DEBUG */ + + KERNEL_DEBUG(DBG_LAYER_BEG, ip->ip_dst.s_addr, ip->ip_src.s_addr, + ip->ip_p, ip->ip_off, ip->ip_len); - dst = (struct sockaddr_in *)&ro->ro_dst; + dst = SIN(&ro->ro_dst); /* * If there is a cached route, @@ -337,46 +609,151 @@ loopit: * cache with IPv6. */ - { - if (ro->ro_rt && (ro->ro_rt->generation_id != route_generation) && - ((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0) && (ip->ip_src.s_addr != INADDR_ANY) && - (ifa_foraddr(ip->ip_src.s_addr) == 0)) { - error = EADDRNOTAVAIL; - goto bad; + if (ro->ro_rt != NULL) { + if (ROUTE_UNUSABLE(ro) && ip->ip_src.s_addr != INADDR_ANY && + !(flags & (IP_ROUTETOIF | IP_FORWARDING))) { + src_ia = ifa_foraddr(ip->ip_src.s_addr); + if (src_ia == NULL) { + error = EADDRNOTAVAIL; + goto bad; + } + IFA_REMREF(&src_ia->ia_ifa); + src_ia = NULL; } + /* + * Test rt_flags without holding rt_lock for performance + * reasons; if the route is down it will hopefully be + * caught by the layer below (since it uses this route + * as a hint) or during the next transmit. + */ + if (ROUTE_UNUSABLE(ro) || dst->sin_family != AF_INET || + dst->sin_addr.s_addr != pkt_dst.s_addr) + ROUTE_RELEASE(ro); + + /* + * If we're doing source interface selection, we may not + * want to use this route; only synch up the generation + * count otherwise. + */ + if (!ipobf.select_srcif && ro->ro_rt != NULL && + RT_GENID_OUTOFSYNC(ro->ro_rt)) + RT_GENID_SYNC(ro->ro_rt); } - if (ro->ro_rt && ((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 = (struct rtentry *)0; - } - if (ro->ro_rt == 0) { - bzero(dst, sizeof(*dst)); + if (ro->ro_rt == NULL) { + bzero(dst, sizeof (*dst)); dst->sin_family = AF_INET; - dst->sin_len = sizeof(*dst); + dst->sin_len = sizeof (*dst); dst->sin_addr = pkt_dst; } /* * If routing to interface only, * short circuit routing lookup. */ -#define ifatoia(ifa) ((struct in_ifaddr *)(ifa)) -#define sintosa(sin) ((struct sockaddr *)(sin)) if (flags & IP_ROUTETOIF) { - if (ia) - ifafree(&ia->ia_ifa); - if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == 0) { - if ((ia = ifatoia(ifa_ifwithnet(sintosa(dst)))) == 0) { - ipstat.ips_noroute++; + if (ia != NULL) + IFA_REMREF(&ia->ia_ifa); + if ((ia = ifatoia(ifa_ifwithdstaddr(sintosa(dst)))) == NULL) { + ia = ifatoia(ifa_ifwithnet(sintosa(dst))); + if (ia == NULL) { + OSAddAtomic(1, &ipstat.ips_noroute); error = ENETUNREACH; goto bad; } } ifp = ia->ia_ifp; ip->ip_ttl = 1; - isbroadcast = in_broadcast(dst->sin_addr, ifp); + ipobf.isbroadcast = in_broadcast(dst->sin_addr, ifp); + /* + * For consistency with other cases below. Loopback + * multicast case is handled separately by ip_mloopback(). + */ + if ((ifp->if_flags & IFF_LOOPBACK) && + !IN_MULTICAST(ntohl(pkt_dst.s_addr))) { + m->m_pkthdr.rcvif = ifp; + ip_setsrcifaddr_info(m, ifp->if_index, NULL); + ip_setdstifaddr_info(m, ifp->if_index, NULL); + } + } else if (IN_MULTICAST(ntohl(pkt_dst.s_addr)) && + imo != NULL && (ifp = imo->imo_multicast_ifp) != NULL) { + /* + * Bypass the normal routing lookup for multicast + * packets if the interface is specified. + */ + ipobf.isbroadcast = FALSE; + if (ia != NULL) + IFA_REMREF(&ia->ia_ifa); + + /* Macro takes reference on ia */ + IFP_TO_IA(ifp, ia); } else { + struct ifaddr *ia0 = NULL; + boolean_t cloneok = FALSE; + /* + * Perform source interface selection; the source IP address + * must belong to one of the addresses of the interface used + * by the route. For performance reasons, do this only if + * there is no route, or if the routing table has changed, + * or if we haven't done source interface selection on this + * route (for this PCB instance) before. + */ + if (ipobf.select_srcif && + ip->ip_src.s_addr != INADDR_ANY && (ROUTE_UNUSABLE(ro) || + !(ro->ro_flags & ROF_SRCIF_SELECTED))) { + /* Find the source interface */ + ia0 = in_selectsrcif(ip, ro, ifscope); + + /* + * If the source address belongs to a restricted + * interface and the caller forbids our using + * interfaces of such type, pretend that there is no + * route. + */ + if (ia0 != NULL && + IP_CHECK_RESTRICTIONS(ia0->ifa_ifp, ipobf)) { + IFA_REMREF(ia0); + ia0 = NULL; + error = EHOSTUNREACH; + if (flags & IP_OUTARGS) + ipoa->ipoa_retflags |= IPOARF_IFDENIED; + goto bad; + } + + /* + * If the source address is spoofed (in the case of + * IP_RAWOUTPUT on an unbounded socket), or if this + * is destined for local/loopback, just let it go out + * using the interface of the route. Otherwise, + * there's no interface having such an address, + * so bail out. + */ + if (ia0 == NULL && (!(flags & IP_RAWOUTPUT) || + ipobf.srcbound) && ifscope != lo_ifp->if_index) { + error = EADDRNOTAVAIL; + goto bad; + } + + /* + * If the caller didn't explicitly specify the scope, + * pick it up from the source interface. If the cached + * route was wrong and was blown away as part of source + * interface selection, don't mask out RTF_PRCLONING + * since that route may have been allocated by the ULP, + * unless the IP header was created by the caller or + * the destination is IPv4 LLA. The check for the + * latter is needed because IPv4 LLAs are never scoped + * in the current implementation, and we don't want to + * replace the resolved IPv4 LLA route with one whose + * gateway points to that of the default gateway on + * the primary interface of the system. + */ + if (ia0 != NULL) { + if (ifscope == IFSCOPE_NONE) + ifscope = ia0->ifa_ifp->if_index; + cloneok = (!(flags & IP_RAWOUTPUT) && + !(IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)))); + } + } + /* * If this is the case, we probably don't want to allocate * a protocol-cloned route since we didn't get one from the @@ -386,29 +763,140 @@ loopit: * the link layer, as this is probably required in all cases * for correct operation (as it is for ARP). */ - if (ro->ro_rt == 0) - rtalloc_ign(ro, RTF_PRCLONING); - if (ro->ro_rt == 0) { - ipstat.ips_noroute++; + if (ro->ro_rt == NULL) { + unsigned long ign = RTF_PRCLONING; + /* + * We make an exception here: if the destination + * address is INADDR_BROADCAST, allocate a protocol- + * cloned host route so that we end up with a route + * marked with the RTF_BROADCAST flag. Otherwise, + * we would end up referring to the default route, + * instead of creating a cloned host route entry. + * That would introduce inconsistencies between ULPs + * that allocate a route and those that don't. The + * RTF_BROADCAST route is important since we'd want + * to send out undirected IP broadcast packets using + * link-level broadcast address. Another exception + * is for ULP-created routes that got blown away by + * source interface selection (see above). + * + * These exceptions will no longer be necessary when + * the RTF_PRCLONING scheme is no longer present. + */ + if (cloneok || dst->sin_addr.s_addr == INADDR_BROADCAST) + ign &= ~RTF_PRCLONING; + + /* + * Loosen the route lookup criteria if the ifscope + * corresponds to the loopback interface; this is + * needed to support Application Layer Gateways + * listening on loopback, in conjunction with packet + * filter redirection rules. The final source IP + * address will be rewritten by the packet filter + * prior to the RFC1122 loopback check below. + */ + if (ifscope == lo_ifp->if_index) + rtalloc_ign(ro, ign); + else + rtalloc_scoped_ign(ro, ign, ifscope); + + /* + * If the route points to a cellular/expensive interface + * and the caller forbids our using interfaces of such type, + * pretend that there is no route. + */ + if (ro->ro_rt != NULL) { + RT_LOCK_SPIN(ro->ro_rt); + if (IP_CHECK_RESTRICTIONS(ro->ro_rt->rt_ifp, + ipobf)) { + RT_UNLOCK(ro->ro_rt); + ROUTE_RELEASE(ro); + if (flags & IP_OUTARGS) { + ipoa->ipoa_retflags |= + IPOARF_IFDENIED; + } + } else { + RT_UNLOCK(ro->ro_rt); + } + } + } + + if (ro->ro_rt == NULL) { + OSAddAtomic(1, &ipstat.ips_noroute); error = EHOSTUNREACH; + if (ia0 != NULL) { + IFA_REMREF(ia0); + ia0 = NULL; + } goto bad; } - if (ia) - ifafree(&ia->ia_ifa); + + if (ia != NULL) + IFA_REMREF(&ia->ia_ifa); + RT_LOCK_SPIN(ro->ro_rt); ia = ifatoia(ro->ro_rt->rt_ifa); - if (ia) - ifaref(&ia->ia_ifa); + if (ia != NULL) { + /* Become a regular mutex */ + RT_CONVERT_LOCK(ro->ro_rt); + IFA_ADDREF(&ia->ia_ifa); + } + /* + * Note: ia_ifp may not be the same as rt_ifp; the latter + * is what we use for determining outbound i/f, mtu, etc. + */ ifp = ro->ro_rt->rt_ifp; ro->ro_rt->rt_use++; - if (ro->ro_rt->rt_flags & RTF_GATEWAY) - dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; - if (ro->ro_rt->rt_flags & RTF_HOST) - isbroadcast = (ro->ro_rt->rt_flags & RTF_BROADCAST); - else - isbroadcast = in_broadcast(dst->sin_addr, ifp); + if (ro->ro_rt->rt_flags & RTF_GATEWAY) { + dst = SIN(ro->ro_rt->rt_gateway); + } + if (ro->ro_rt->rt_flags & RTF_HOST) { + /* double negation needed for bool bit field */ + ipobf.isbroadcast = + !!(ro->ro_rt->rt_flags & RTF_BROADCAST); + } else { + /* Become a regular mutex */ + RT_CONVERT_LOCK(ro->ro_rt); + ipobf.isbroadcast = in_broadcast(dst->sin_addr, ifp); + } + /* + * For consistency with IPv6, as well as to ensure that + * IP_RECVIF is set correctly for packets that are sent + * to one of the local addresses. ia (rt_ifa) would have + * been fixed up by rt_setif for local routes. This + * would make it appear as if the packet arrives on the + * interface which owns the local address. Loopback + * multicast case is handled separately by ip_mloopback(). + */ + if (ia != NULL && (ifp->if_flags & IFF_LOOPBACK) && + !IN_MULTICAST(ntohl(pkt_dst.s_addr))) { + uint32_t srcidx; + + m->m_pkthdr.rcvif = ia->ia_ifa.ifa_ifp; + + if (ia0 != NULL) + srcidx = ia0->ifa_ifp->if_index; + else if ((ro->ro_flags & ROF_SRCIF_SELECTED) && + ro->ro_srcia != NULL) + srcidx = ro->ro_srcia->ifa_ifp->if_index; + else + srcidx = 0; + + ip_setsrcifaddr_info(m, srcidx, NULL); + ip_setdstifaddr_info(m, 0, ia); + } + RT_UNLOCK(ro->ro_rt); + if (ia0 != NULL) { + IFA_REMREF(ia0); + ia0 = NULL; + } } + if (IN_MULTICAST(ntohl(pkt_dst.s_addr))) { + struct ifnet *srcifp = NULL; struct in_multi *inm; + u_int32_t vif; + u_int8_t ttl = IP_DEFAULT_MULTICAST_TTL; + u_int8_t loop = IP_DEFAULT_MULTICAST_LOOP; m->m_flags |= M_MCAST; /* @@ -416,27 +904,30 @@ loopit: * still points to the address in "ro". (It may have been * changed to point to a gateway address, above.) */ - dst = (struct sockaddr_in *)&ro->ro_dst; + dst = SIN(&ro->ro_dst); /* * See if the caller provided any multicast options */ if (imo != NULL) { - if ((flags & IP_RAWOUTPUT) == 0) ip->ip_ttl = imo->imo_multicast_ttl; - if (imo->imo_multicast_ifp != NULL) { + IMO_LOCK(imo); + vif = imo->imo_multicast_vif; + ttl = imo->imo_multicast_ttl; + loop = imo->imo_multicast_loop; + if (!(flags & IP_RAWOUTPUT)) + ip->ip_ttl = ttl; + if (imo->imo_multicast_ifp != NULL) ifp = imo->imo_multicast_ifp; - } - if (imo->imo_multicast_vif != -1 && - ((flags & IP_RAWOUTPUT) == 0 || ip->ip_src.s_addr == INADDR_ANY)) - ip->ip_src.s_addr = - ip_mcast_src(imo->imo_multicast_vif); - } else - if ((flags & IP_RAWOUTPUT) == 0) ip->ip_ttl = IP_DEFAULT_MULTICAST_TTL; + IMO_UNLOCK(imo); + } else if (!(flags & IP_RAWOUTPUT)) { + vif = -1; + ip->ip_ttl = ttl; + } /* * Confirm that the outgoing interface supports multicast. */ - if ((imo == NULL) || (imo->imo_multicast_vif == -1)) { - if ((ifp->if_flags & IFF_MULTICAST) == 0) { - ipstat.ips_noroute++; + if (imo == NULL || vif == -1) { + if (!(ifp->if_flags & IFF_MULTICAST)) { + OSAddAtomic(1, &ipstat.ips_noroute); error = ENETUNREACH; goto bad; } @@ -446,25 +937,29 @@ loopit: * of outgoing interface. */ if (ip->ip_src.s_addr == INADDR_ANY) { - register struct in_ifaddr *ia1; - - TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link) + struct in_ifaddr *ia1; + lck_rw_lock_shared(in_ifaddr_rwlock); + TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link) { + IFA_LOCK_SPIN(&ia1->ia_ifa); if (ia1->ia_ifp == ifp) { ip->ip_src = IA_SIN(ia1)->sin_addr; - + srcifp = ifp; + IFA_UNLOCK(&ia1->ia_ifa); break; } + IFA_UNLOCK(&ia1->ia_ifa); + } + lck_rw_done(in_ifaddr_rwlock); if (ip->ip_src.s_addr == INADDR_ANY) { error = ENETUNREACH; goto bad; } } - ifnet_lock_shared(ifp); - IN_LOOKUP_MULTI(pkt_dst, ifp, inm); - ifnet_lock_done(ifp); - if (inm != NULL && - (imo == NULL || imo->imo_multicast_loop)) { + in_multihead_lock_shared(); + IN_LOOKUP_MULTI(&pkt_dst, ifp, inm); + in_multihead_lock_done(); + if (inm != NULL && (imo == NULL || loop)) { /* * If we belong to the destination multicast group * on the outgoing interface, and the caller did not @@ -472,82 +967,64 @@ loopit: */ 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; + int seen = (inject_filter_ref == NULL); + + if (imo != NULL) { + ipf_pktopts.ippo_flags |= + IPPOF_MCAST_OPTS; + ipf_pktopts.ippo_mcast_ifnet = ifp; + ipf_pktopts.ippo_mcast_ttl = ttl; + ipf_pktopts.ippo_mcast_loop = loop; } - - lck_mtx_unlock(ip_mutex); + ipf_ref(); - - /* 4135317 - always pass network byte order to filter */ + + /* + * 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) + if ((struct ipfilter *) + inject_filter_ref == filter) seen = 1; - } else if (filter->ipf_filter.ipf_output) { + } else if (filter->ipf_filter. + ipf_output != NULL) { errno_t result; - result = filter->ipf_filter.ipf_output(filter->ipf_filter.cookie, (mbuf_t*)&m, ippo); + result = filter->ipf_filter. + ipf_output(filter-> + ipf_filter.cookie, + (mbuf_t *)&m, ippo); if (result == EJUSTRETURN) { ipf_unref(); + INM_REMREF(inm); goto done; } if (result != 0) { ipf_unref(); - lck_mtx_lock(ip_mutex); + INM_REMREF(inm); goto bad; } } } - + /* set back to host byte order */ + ip = mtod(m, struct ip *); +#if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_len); NTOHS(ip->ip_off); - - lck_mtx_lock(ip_mutex); +#endif ipf_unref(); - didfilter = 1; - } - ip_mloopback(ifp, m, dst, hlen); - } - else { - /* - * If we are acting as a multicast router, perform - * multicast forwarding as if the packet had just - * arrived on the interface to which we are about - * to send. The multicast forwarding function - * recursively calls this function, using the - * IP_FORWARDING flag to prevent infinite recursion. - * - * Multicasts that are looped back by ip_mloopback(), - * above, will be forwarded by the ip_input() routine, - * if necessary. - */ - if (ip_mrouter && (flags & IP_FORWARDING) == 0) { - /* - * 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); - lck_mtx_unlock(ip_mutex); - goto done; - } + ipobf.didfilter = TRUE; } + ip_mloopback(srcifp, ifp, m, dst, hlen); } - + if (inm != NULL) + INM_REMREF(inm); /* * Multicasts with a time-to-live of zero may be looped- * back, above, but must not be transmitted on a network. @@ -558,41 +1035,41 @@ loopit: */ if (ip->ip_ttl == 0 || ifp->if_flags & IFF_LOOPBACK) { m_freem(m); - lck_mtx_unlock(ip_mutex); 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) { + IFA_LOCK_SPIN(&ia->ia_ifa); ip->ip_src = IA_SIN(ia)->sin_addr; + IFA_UNLOCK(&ia->ia_ifa); #if IPFIREWALL_FORWARD - /* Keep note that we did this - if the firewall changes + /* + * Keep note that we did this - if the firewall changes * the next-hop, our interface may change, changing the * default source IP. It's a shame so much effort happens - * twice. Oh well. + * twice. Oh well. */ - fwd_rewrite_src++; + ipobf.fwd_rewrite_src = TRUE; #endif /* IPFIREWALL_FORWARD */ } -#endif /* notdef */ /* * Look for broadcast address and * and verify user is allowed to send * such a packet. */ - if (isbroadcast) { - if ((ifp->if_flags & IFF_BROADCAST) == 0) { + if (ipobf.isbroadcast) { + if (!(ifp->if_flags & IFF_BROADCAST)) { error = EADDRNOTAVAIL; goto bad; } - if ((flags & IP_ALLOWBROADCAST) == 0) { + if (!(flags & IP_ALLOWBROADCAST)) { error = EACCES; goto bad; } @@ -607,105 +1084,229 @@ loopit: } 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))) { +#if PF + /* Invoke outbound packet filter */ + if (PF_IS_ENABLED) { + int rc; + + m0 = m; /* Save for later */ +#if DUMMYNET + args.fwa_m = m; + args.fwa_next_hop = dst; + args.fwa_oif = ifp; + args.fwa_ro = ro; + args.fwa_dst = dst; + args.fwa_oflags = flags; + if (flags & IP_OUTARGS) + args.fwa_ipoa = ipoa; + rc = pf_af_hook(ifp, mppn, &m, AF_INET, FALSE, &args); +#else /* DUMMYNET */ + rc = pf_af_hook(ifp, mppn, &m, AF_INET, FALSE, NULL); +#endif /* DUMMYNET */ + if (rc != 0 || m == NULL) { + /* Move to the next packet */ + m = *mppn; + + /* Skip ahead if first packet in list got dropped */ + if (packetlist == m0) + packetlist = m; + + if (m != NULL) { + m0 = m; + /* Next packet in the chain */ + goto loopit; + } else if (packetlist != NULL) { + /* No more packet; send down the chain */ + goto sendchain; + } + /* Nothing left; we're done */ + goto done; + } + m0 = m; + ip = mtod(m, struct ip *); + pkt_dst = ip->ip_dst; + hlen = IP_VHL_HL(ip->ip_vhl) << 2; + } +#endif /* PF */ + /* + * Force IP TTL to 255 following draft-ietf-zeroconf-ipv4-linklocal.txt + */ + 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; + ip->ip_ttl = MAXTTL; } - } + } -injectit: - if (!didfilter && !TAILQ_EMPTY(&ipv4_filters)) { + if (!ipobf.didfilter && !TAILQ_EMPTY(&ipv4_filters)) { struct ipfilter *filter; - int seen = (inject_filter_ref == 0); - - lck_mtx_unlock(ip_mutex); + int seen = (inject_filter_ref == NULL); + ipf_pktopts.ippo_flags &= ~IPPOF_MCAST_OPTS; + + /* + * Check that a TSO frame isn't passed to a filter. + * This could happen if a filter is inserted while + * TCP is sending the TSO packet. + */ + if (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) { + error = EMSGSIZE; + goto bad; + } + ipf_ref(); - + /* 4135317 - always pass network byte order to filter */ +#if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); - +#endif TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) { if (seen == 0) { - if ((struct ipfilter *)inject_filter_ref == filter) + 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); + 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(); - lck_mtx_lock(ip_mutex); 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(); - lck_mtx_lock(ip_mutex); } -#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); - - lck_mtx_lock(sadb_mutex); - - /* 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 NECP + /* Process Network Extension Policy. Will Pass, Drop, or Rebind packet. */ + necp_matched_policy_id = necp_ip_output_find_policy_match (m, + flags, (flags & IP_OUTARGS) ? ipoa : NULL, &necp_result, &necp_result_parameter); + if (necp_matched_policy_id) { + necp_mark_packet_from_ip(m, necp_matched_policy_id); + switch (necp_result) { + case NECP_KERNEL_POLICY_RESULT_PASS: + /* Check if the interface is allowed */ + if (!necp_packet_is_allowed_over_interface(m, ifp)) { + error = EHOSTUNREACH; + goto bad; + } + goto skip_ipsec; + case NECP_KERNEL_POLICY_RESULT_DROP: + case NECP_KERNEL_POLICY_RESULT_SOCKET_DIVERT: + /* Flow divert packets should be blocked at the IP layer */ + error = EHOSTUNREACH; + goto bad; + case NECP_KERNEL_POLICY_RESULT_IP_TUNNEL: { + /* Verify that the packet is being routed to the tunnel */ + struct ifnet *policy_ifp = necp_get_ifnet_from_result_parameter(&necp_result_parameter); + if (policy_ifp == ifp) { + /* Check if the interface is allowed */ + if (!necp_packet_is_allowed_over_interface(m, ifp)) { + error = EHOSTUNREACH; + goto bad; + } + goto skip_ipsec; + } else { + if (necp_packet_can_rebind_to_ifnet(m, policy_ifp, &necp_route, AF_INET)) { + /* Check if the interface is allowed */ + if (!necp_packet_is_allowed_over_interface(m, policy_ifp)) { + error = EHOSTUNREACH; + goto bad; + } - if (sp == NULL) { - ipsecstat.out_inval++; - KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 0,0,0,0,0); - lck_mtx_unlock(sadb_mutex); + /* Set ifp to the tunnel interface, since it is compatible with the packet */ + ifp = policy_ifp; + ro = &necp_route; + goto skip_ipsec; + } else { + error = ENETUNREACH; + goto bad; + } + } + break; + } + default: + break; + } + } + /* Catch-all to check if the interface is allowed */ + if (!necp_packet_is_allowed_over_interface(m, ifp)) { + error = EHOSTUNREACH; goto bad; } +#endif /* NECP */ + +#if IPSEC + if (ipsec_bypass != 0 || (flags & IP_NOIPSEC)) + goto skip_ipsec; + + KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_START, 0, 0, 0, 0, 0); + + if (sp == NULL) { + /* get SP for this packet */ + if (so != NULL) { + sp = ipsec4_getpolicybysock(m, IPSEC_DIR_OUTBOUND, + so, &error); + } else { + sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, + flags, &error); + } + if (sp == NULL) { + IPSEC_STAT_INCREMENT(ipsecstat.out_inval); + KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, + 0, 0, 0, 0, 0); + goto bad; + } + } error = 0; /* check policy */ switch (sp->policy) { case IPSEC_POLICY_DISCARD: + case IPSEC_POLICY_GENERATE: /* * This packet is just discarded. */ - ipsecstat.out_polvio++; - KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 1,0,0,0,0); - lck_mtx_unlock(sadb_mutex); + 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); - lck_mtx_unlock(sadb_mutex); + 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); - lck_mtx_unlock(sadb_mutex); + KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, + 3, 0, 0, 0, 0); + goto bad; + } + if (sp->ipsec_if) { + /* Verify the redirect to ipsec interface */ + if (sp->ipsec_if == ifp) { + goto skip_ipsec; + } goto bad; } break; @@ -714,16 +1315,14 @@ injectit: default: printf("ip_output: Invalid policy found. %d\n", sp->policy); } - { - struct ipsec_output_state state; - bzero(&state, sizeof(state)); - state.m = m; + { + ipsec_state.m = m; if (flags & IP_ROUTETOIF) { - state.ro = &iproute; - bzero(&iproute, sizeof(iproute)); - } else - state.ro = ro; - state.dst = (struct sockaddr *)dst; + bzero(&ipsec_state.ro, sizeof (ipsec_state.ro)); + } else { + route_copyout(&ipsec_state.ro, ro, sizeof (ipsec_state.ro)); + } + ipsec_state.dst = SA(dst); ip->ip_sum = 0; @@ -731,34 +1330,50 @@ injectit: * XXX * delayed checksums are not currently compatible with IPsec */ - if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { + if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) in_delayed_cksum(m); - m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; - } +#if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); +#endif + + DTRACE_IP6(send, struct mbuf *, m, struct inpcb *, NULL, + struct ip *, ip, struct ifnet *, ifp, + struct ip *, ip, struct ip6_hdr *, NULL); + + error = ipsec4_output(&ipsec_state, sp, flags); + if (ipsec_state.tunneled == 6) { + m0 = m = NULL; + error = 0; + goto bad; + } + + m0 = m = ipsec_state.m; + +#if DUMMYNET + /* + * If we're about to use the route in ipsec_state + * and this came from dummynet, cleaup now. + */ + if (ro == &saved_route && + (!(flags & IP_ROUTETOIF) || ipsec_state.tunneled)) + ROUTE_RELEASE(ro); +#endif /* DUMMYNET */ - lck_mtx_unlock(ip_mutex); - error = ipsec4_output(&state, sp, flags); - lck_mtx_unlock(sadb_mutex); - lck_mtx_lock(ip_mutex); - - m0 = m = state.m; - if (flags & IP_ROUTETOIF) { /* * if we have tunnel mode SA, we may need to ignore * IP_ROUTETOIF. */ - if (state.ro != &iproute || state.ro->ro_rt != NULL) { + if (ipsec_state.tunneled) { flags &= ~IP_ROUTETOIF; - ro = state.ro; + ro = &ipsec_state.ro; } - } else - ro = state.ro; - - dst = (struct sockaddr_in *)state.dst; + } else { + ro = &ipsec_state.ro; + } + dst = SIN(ipsec_state.dst); if (error) { /* mbuf is already reclaimed in ipsec4_output. */ m0 = NULL; @@ -771,198 +1386,213 @@ injectit: break; default: printf("ip4_output (ipsec): error code %d\n", error); - /*fall through*/ + /* FALLTHRU */ case ENOENT: /* don't show these error codes to the user */ error = 0; break; } - KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 4,0,0,0,0); + KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, + 4, 0, 0, 0, 0); goto bad; } - } + } /* be sure to update variables that are affected by ipsec4_output() */ ip = mtod(m, struct ip *); - + #ifdef _IP_VHL hlen = IP_VHL_HL(ip->ip_vhl) << 2; -#else +#else /* !_IP_VHL */ hlen = ip->ip_hl << 2; -#endif +#endif /* !_IP_VHL */ /* Check that there wasn't a route change and src is still valid */ - - if (ro->ro_rt->generation_id != route_generation) { - if (ifa_foraddr(ip->ip_src.s_addr) == 0 && ((flags & (IP_ROUTETOIF | IP_FORWARDING)) == 0)) { - error = EADDRNOTAVAIL; - KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 5,0,0,0,0); + if (ROUTE_UNUSABLE(ro)) { + ROUTE_RELEASE(ro); + VERIFY(src_ia == NULL); + if (ip->ip_src.s_addr != INADDR_ANY && + !(flags & (IP_ROUTETOIF | IP_FORWARDING)) && + (src_ia = ifa_foraddr(ip->ip_src.s_addr)) == NULL) { + error = EADDRNOTAVAIL; + KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, + 5, 0, 0, 0, 0); goto bad; } - rtfree(ro->ro_rt); - ro->ro_rt = NULL; + if (src_ia != NULL) { + IFA_REMREF(&src_ia->ia_ifa); + src_ia = NULL; + } } if (ro->ro_rt == NULL) { - if ((flags & IP_ROUTETOIF) == 0) { - printf("ip_output: " - "can't update route after IPsec processing\n"); - error = EHOSTUNREACH; /*XXX*/ - KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 6,0,0,0,0); + if (!(flags & IP_ROUTETOIF)) { + printf("%s: can't update route after " + "IPsec processing\n", __func__); + error = EHOSTUNREACH; /* XXX */ + KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, + 6, 0, 0, 0, 0); goto bad; } } else { - if (ia) - ifafree(&ia->ia_ifa); + if (ia != NULL) + IFA_REMREF(&ia->ia_ifa); + RT_LOCK_SPIN(ro->ro_rt); ia = ifatoia(ro->ro_rt->rt_ifa); - if (ia) - ifaref(&ia->ia_ifa); + if (ia != NULL) { + /* Become a regular mutex */ + RT_CONVERT_LOCK(ro->ro_rt); + IFA_ADDREF(&ia->ia_ifa); + } ifp = ro->ro_rt->rt_ifp; + RT_UNLOCK(ro->ro_rt); } /* make it flipped, again. */ +#if BYTE_ORDER != BIG_ENDIAN NTOHS(ip->ip_len); NTOHS(ip->ip_off); - KERNEL_DEBUG(DBG_FNC_IPSEC4_OUTPUT | DBG_FUNC_END, 7,0xff,0xff,0xff,0xff); - +#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; - - lck_mtx_unlock(ip_mutex); + + ipf_pktopts.ippo_flags &= ~IPPOF_MCAST_OPTS; + + /* + * Check that a TSO frame isn't passed to a filter. + * This could happen if a filter is inserted while + * TCP is sending the TSO packet. + */ + if (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) { + error = EMSGSIZE; + goto bad; + } + ipf_ref(); - + /* 4135317 - always pass network byte order to filter */ +#if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); - +#endif TAILQ_FOREACH(filter, &ipv4_filters, ipf_link) { if (filter->ipf_filter.ipf_output) { errno_t result; - result = filter->ipf_filter.ipf_output(filter->ipf_filter.cookie, (mbuf_t*)&m, 0); + 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(); - lck_mtx_lock(ip_mutex); 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(); - lck_mtx_lock(ip_mutex); } skip_ipsec: -#endif /*IPSEC*/ - - /* - * IpHack's section. - * - Xlate: translate packet's addr/port (NAT). - * - Firewall: deny/allow/etc. - * - Wrap: fake packet's addr/port - * - Encapsulate: put it in another IP and send out. - */ - if (fr_checkp) { - struct mbuf *m1 = m; - - if ((error = (*fr_checkp)(ip, hlen, ifp, 1, &m1)) || !m1) { - lck_mtx_unlock(ip_mutex); - goto done; - } - ip = mtod(m0 = m = m1, struct ip *); - } +#endif /* IPSEC */ +#if IPFIREWALL /* * Check with the firewall... * but not if we are already being fwd'd from a firewall. */ - if (fw_enable && IPFW_LOADED && !args.next_hop) { + if (fw_enable && IPFW_LOADED && !args.fwa_next_hop) { struct sockaddr_in *old = dst; - args.m = m; - args.next_hop = dst; - args.oif = ifp; - lck_mtx_unlock(ip_mutex); - 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. - */ + args.fwa_m = m; + args.fwa_next_hop = dst; + args.fwa_oif = ifp; + ipfwoff = ip_fw_chk_ptr(&args); + m = args.fwa_m; + dst = args.fwa_next_hop; + + /* + * On return we must do the following: + * IP_FW_PORT_DENY_FLAG -> drop the pkt (XXX new) + * 1<=off<= 0xffff -> DIVERT + * (off & IP_FW_PORT_DYNT_FLAG) -> send to a DUMMYNET pipe + * (off & IP_FW_PORT_TEE_FLAG) -> TEE the packet + * dst != old -> IPFIREWALL_FORWARD + * off==0, dst==old -> accept + * If some of the above modules is not compiled in, then + * we should't have to check the corresponding condition + * (because the ipfw control socket should not accept + * unsupported rules), but better play safe and drop + * packets in case of doubt. + */ m0 = m; - if ( (off & IP_FW_PORT_DENY_FLAG) || m == NULL) { + if ((ipfwoff & IP_FW_PORT_DENY_FLAG) || m == NULL) { if (m) m_freem(m); - error = EACCES ; - goto done ; + error = EACCES; + goto done; } ip = mtod(m, struct ip *); - if (off == 0 && dst == old) {/* common case */ - lck_mtx_lock(ip_mutex); - goto pass ; + + if (ipfwoff == 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; + if (DUMMYNET_LOADED && (ipfwoff & IP_FW_PORT_DYNT_FLAG) != 0) { + /* + * pass the pkt to dummynet. Need to include + * pipe number, m, ifp, ro, dst because these are + * not recomputed in the next pass. + * All other parameters have been already used and + * so they are not needed anymore. + * XXX note: if the ifp or ro entry are deleted + * while a pkt is in dummynet, we are in trouble! + */ + args.fwa_ro = ro; + args.fwa_dst = dst; + args.fwa_oflags = flags; + if (flags & IP_OUTARGS) + args.fwa_ipoa = ipoa; + + error = ip_dn_io_ptr(m, ipfwoff & 0xffff, DN_TO_IP_OUT, + &args, DN_CLIENT_IPFW); + goto done; } #endif /* DUMMYNET */ - lck_mtx_lock(ip_mutex); #if IPDIVERT - if (off != 0 && (off & IP_FW_PORT_DYNT_FLAG) == 0) { + if (ipfwoff != 0 && (ipfwoff & IP_FW_PORT_DYNT_FLAG) == 0) { struct mbuf *clone = NULL; /* Clone packet if we're doing a 'tee' */ - if ((off & IP_FW_PORT_TEE_FLAG) != 0) + if ((ipfwoff & IP_FW_PORT_TEE_FLAG) != 0) clone = m_dup(m, M_DONTWAIT); /* * XXX * delayed checksums are not currently compatible * with divert sockets. */ - if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { + if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) in_delayed_cksum(m); - m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; - } /* Restore packet header fields to original values */ + +#if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); +#endif /* Deliver packet to divert input routine */ - divert_packet(m, 0, off & 0xffff, args.divert_rule); + divert_packet(m, 0, ipfwoff & 0xffff, + args.fwa_divert_rule); /* If 'tee', continue with original packet */ if (clone != NULL) { @@ -970,14 +1600,13 @@ skip_ipsec: ip = mtod(m, struct ip *); goto pass; } - lck_mtx_unlock(ip_mutex); goto done; } -#endif - +#endif /* IPDIVERT */ #if IPFIREWALL_FORWARD - /* Here we check dst to make sure it's directly reachable on the - * interface we previously thought it was. + /* + * Here we check dst to make sure it's directly reachable on + * the interface we previously thought it was. * If it isn't (which may be likely in some situations) we have * to re-route it (ie, find a route for the next-hop and the * associated interface) and set them here. This is nested @@ -985,240 +1614,239 @@ skip_ipsec: * such control is nigh impossible. So we do it here. * And I'm babbling. */ - if (off == 0 && old != dst) { + if (ipfwoff == 0 && old != dst) { struct in_ifaddr *ia_fw; + struct route *ro_fwd = &sro_fwd; - /* It's changed... */ - /* There must be a better way to do this next line... */ - static struct route sro_fwd, *ro_fwd = &sro_fwd; #if IPFIREWALL_FORWARD_DEBUG printf("IPFIREWALL_FORWARD: New dst ip: "); print_ip(dst->sin_addr); printf("\n"); -#endif +#endif /* IPFIREWALL_FORWARD_DEBUG */ /* * We need to figure out if we have been forwarded - * to a local socket. If so then we should somehow + * to a local socket. If so then we should somehow * "loop back" to ip_input, and get directed to the * PCB as if we had received this packet. This is * because it may be dificult to identify the packets * you want to forward until they are being output * and have selected an interface. (e.g. locally * initiated packets) If we used the loopback inteface, - * we would not be able to control what happens + * we would not be able to control what happens * as the packet runs through ip_input() as * it is done through a ISR. */ + 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. */ + IFA_LOCK_SPIN(&ia_fw->ia_ifa); if (IA_SIN(ia_fw)->sin_addr.s_addr == - dst->sin_addr.s_addr) + dst->sin_addr.s_addr) { + IFA_UNLOCK(&ia_fw->ia_ifa); break; + } + IFA_UNLOCK(&ia_fw->ia_ifa); } - if (ia) { + lck_rw_done(in_ifaddr_rwlock); + if (ia_fw) { /* tell ip_input "dont filter" */ - struct m_tag *fwd_tag; + 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); + + fwd_tag = m_tag_create(KERNEL_MODULE_TAG_ID, + KERNEL_TAG_TYPE_IPFORWARD, + sizeof (*ipfwd_tag), M_NOWAIT, m); if (fwd_tag == NULL) { error = ENOBUFS; goto bad; } - + ipfwd_tag = (struct ip_fwd_tag *)(fwd_tag+1); - ipfwd_tag->next_hop = args.next_hop; + ipfwd_tag->next_hop = args.fwa_next_hop; m_tag_prepend(m, fwd_tag); if (m->m_pkthdr.rcvif == NULL) - m->m_pkthdr.rcvif = ifunit("lo0"); - if ((~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); - } + m->m_pkthdr.rcvif = lo_ifp; + +#if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); - - lck_mtx_unlock(ip_mutex); - - /* we need to call dlil_output to run filters - * and resync to avoid recursion loops. +#endif + mbuf_outbound_finalize(m, PF_INET, 0); + + /* + * we need to call dlil_output to run filters + * and resync to avoid recursion loops. */ if (lo_ifp) { - dlil_output(lo_ifp, PF_INET, m, 0, (struct sockaddr *)dst, 0); - } - else { - printf("ip_output: no loopback ifp for forwarding!!!\n"); + dlil_output(lo_ifp, PF_INET, m, NULL, + SA(dst), 0, adv); + } else { + printf("%s: no loopback ifp for " + "forwarding!!!\n", __func__); } goto done; } - /* Some of the logic for this was - * nicked from above. + /* + * Some of the logic for this was nicked from above. * * This rewrites the cached route in a local PCB. * Is this what we want to do? */ - bcopy(dst, &ro_fwd->ro_dst, sizeof(*dst)); + ROUTE_RELEASE(ro_fwd); + bcopy(dst, &ro_fwd->ro_dst, sizeof (*dst)); - ro_fwd->ro_rt = 0; rtalloc_ign(ro_fwd, RTF_PRCLONING); - if (ro_fwd->ro_rt == 0) { - ipstat.ips_noroute++; + 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) { + /* Become a regular mutex */ + RT_CONVERT_LOCK(ro_fwd->ro_rt); + IFA_ADDREF(&ia_fw->ia_ifa); + } ifp = ro_fwd->ro_rt->rt_ifp; ro_fwd->ro_rt->rt_use++; if (ro_fwd->ro_rt->rt_flags & RTF_GATEWAY) - dst = (struct sockaddr_in *)ro_fwd->ro_rt->rt_gateway; - if (ro_fwd->ro_rt->rt_flags & RTF_HOST) - isbroadcast = - (ro_fwd->ro_rt->rt_flags & RTF_BROADCAST); - else - isbroadcast = in_broadcast(dst->sin_addr, ifp); - rtfree(ro->ro_rt); + dst = SIN(ro_fwd->ro_rt->rt_gateway); + if (ro_fwd->ro_rt->rt_flags & RTF_HOST) { + /* double negation needed for bool bit field */ + ipobf.isbroadcast = + !!(ro_fwd->ro_rt->rt_flags & RTF_BROADCAST); + } else { + /* Become a regular mutex */ + RT_CONVERT_LOCK(ro_fwd->ro_rt); + ipobf.isbroadcast = + in_broadcast(dst->sin_addr, ifp); + } + RT_UNLOCK(ro_fwd->ro_rt); + ROUTE_RELEASE(ro); ro->ro_rt = ro_fwd->ro_rt; - dst = (struct sockaddr_in *)&ro_fwd->ro_dst; + ro_fwd->ro_rt = NULL; + dst = SIN(&ro_fwd->ro_dst); /* * If we added a default src ip earlier, * which would have been gotten from the-then * interface, do it again, from the new one. */ - if (fwd_rewrite_src) - ip->ip_src = IA_SIN(ia_fw)->sin_addr; - goto pass ; + if (ia_fw != NULL) { + if (ipobf.fwd_rewrite_src) { + IFA_LOCK_SPIN(&ia_fw->ia_ifa); + ip->ip_src = IA_SIN(ia_fw)->sin_addr; + IFA_UNLOCK(&ia_fw->ia_ifa); + } + IFA_REMREF(&ia_fw->ia_ifa); + } + goto pass; } #endif /* IPFIREWALL_FORWARD */ - /* - * if we get here, none of the above matches, and - * we have to drop the pkt - */ + /* + * if we get here, none of the above matches, and + * we have to drop the pkt + */ m_freem(m); error = EACCES; /* not sure this is the right error msg */ - lck_mtx_unlock(ip_mutex); goto done; } 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)) { - 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; - lck_mtx_unlock(ip_mutex); - goto done; - } -#endif - m->m_pkthdr.csum_flags |= CSUM_IP; - sw_csum = m->m_pkthdr.csum_flags - & ~IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist); +#endif /* IPFIREWALL */ - if ((ifp->if_hwassist & CSUM_TCP_SUM16) != 0) { - /* - * Special case code for GMACE - * frames that can be checksumed by GMACE SUM16 HW: - * frame >64, no fragments, no UDP - */ - if (apple_hwcksum_tx && (m->m_pkthdr.csum_flags & CSUM_TCP) - && (ip->ip_len > 50) && (ip->ip_len <= ifp->if_mtu)) { - /* Apple GMAC HW, expects STUFF_OFFSET << 16 | START_OFFSET */ - u_short offset = (IP_VHL_HL(ip->ip_vhl) << 2) +14 ; /* IP+Enet header length */ - u_short csumprev= m->m_pkthdr.csum_data & 0xFFFF; - m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_TCP_SUM16; /* for GMAC */ - m->m_pkthdr.csum_data = (csumprev + offset) << 16 ; - m->m_pkthdr.csum_data += offset; - sw_csum = CSUM_DELAY_IP; /* do IP hdr chksum in software */ - } - else { - /* let the software handle any UDP or TCP checksums */ - sw_csum |= (CSUM_DELAY_DATA & m->m_pkthdr.csum_flags); - } - } - - if (sw_csum & CSUM_DELAY_DATA) { - in_delayed_cksum(m); - sw_csum &= ~CSUM_DELAY_DATA; - m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; + /* 127/8 must not appear on wire - RFC1122 */ + if (!(ifp->if_flags & IFF_LOOPBACK) && + ((ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET || + (ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)) { + OSAddAtomic(1, &ipstat.ips_badaddr); + error = EADDRNOTAVAIL; + goto bad; } - - m->m_pkthdr.csum_flags &= IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist); + + ip_output_checksum(ifp, m, (IP_VHL_HL(ip->ip_vhl) << 2), + ip->ip_len, &sw_csum); /* * If small enough for interface, or the interface will take * care of the fragmentation for us, can just send directly. */ - if ((u_short)ip->ip_len <= ifp->if_mtu || - ifp->if_hwassist & CSUM_FRAGMENT) { + if ((u_short)ip->ip_len <= ifp->if_mtu || TSO_IPV4_OK(ifp, m) || + (!(ip->ip_off & IP_DF) && (ifp->if_hwassist & CSUM_FRAGMENT))) { +#if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_len); HTONS(ip->ip_off); +#endif + ip->ip_sum = 0; if (sw_csum & CSUM_DELAY_IP) { - ip->ip_sum = in_cksum(m, hlen); - } - -#ifndef __APPLE__ - /* Record statistics for this interface address. */ - if (!(flags & IP_FORWARDING) && ia != NULL) { - ia->ia_ifa.if_opackets++; - ia->ia_ifa.if_obytes += m->m_pkthdr.len; + ip->ip_sum = ip_cksum_hdr_out(m, hlen); + sw_csum &= ~CSUM_DELAY_IP; + m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IP; } -#endif #if IPSEC /* clean ipsec history once it goes out of the node */ - if (ipsec_bypass == 0 && (flags & IP_NOIPSEC) == 0) + if (ipsec_bypass == 0 && !(flags & IP_NOIPSEC)) ipsec_delaux(m); -#endif +#endif /* IPSEC */ + if ((m->m_pkthdr.csum_flags & CSUM_TSO_IPV4) && + (m->m_pkthdr.tso_segsz > 0)) + scnt += m->m_pkthdr.len / m->m_pkthdr.tso_segsz; + else + scnt++; + if (packetchain == 0) { - lck_mtx_unlock(ip_mutex); - error = dlil_output(ifp, PF_INET, m, (void *) ro->ro_rt, - (struct sockaddr *)dst, 0); - goto done; - } - else { /* packet chaining allows us to reuse the route for all packets */ + if (ro->ro_rt != NULL && nstat_collect) + nstat_route_tx(ro->ro_rt, scnt, + m->m_pkthdr.len, 0); + + error = dlil_output(ifp, PF_INET, m, ro->ro_rt, + SA(dst), 0, adv); + if (dlil_verbose && error) { + printf("dlil_output error on interface %s: %d\n", + ifp->if_xname, error); + } + scnt = 0; + goto done; + } else { + /* + * packet chaining allows us to reuse the + * route for all packets + */ + bytecnt += m->m_pkthdr.len; + mppn = &m->m_nextpkt; m = m->m_nextpkt; if (m == NULL) { +#if PF +sendchain: +#endif /* PF */ if (pktcnt > ip_maxchainsent) ip_maxchainsent = pktcnt; - //send - lck_mtx_unlock(ip_mutex); - error = dlil_output_list(ifp, PF_INET, packetlist, (void *) ro->ro_rt, - (struct sockaddr *)dst, 0); + if (ro->ro_rt != NULL && nstat_collect) + nstat_route_tx(ro->ro_rt, scnt, + bytecnt, 0); + + error = dlil_output(ifp, PF_INET, packetlist, + ro->ro_rt, SA(dst), 0, adv); + if (dlil_verbose && error) { + printf("dlil_output error on interface %s: %d\n", + ifp->if_xname, error); + } pktcnt = 0; + scnt = 0; + bytecnt = 0; goto done; - + } m0 = m; pktcnt++; @@ -1228,8 +1856,10 @@ pass: /* * Too large for interface; fragment if possible. * Must be able to put at least 8 bytes per fragment. + * Balk when DF bit is set or the interface didn't support TSO. */ - if (ip->ip_off & IP_DF) { + if ((ip->ip_off & IP_DF) || pktcnt > 0 || + (m->m_pkthdr.csum_flags & CSUM_TSO_IPV4)) { error = EMSGSIZE; /* * This case can happen if the user changed the MTU @@ -1238,40 +1868,135 @@ pass: * them, there is no way for one to update all its * routes when the MTU is changed. */ - if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) - && !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) - && (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) { - ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; + if (ro->ro_rt) { + RT_LOCK_SPIN(ro->ro_rt); + if ((ro->ro_rt->rt_flags & (RTF_UP | RTF_HOST)) && + !(ro->ro_rt->rt_rmx.rmx_locks & RTV_MTU) && + (ro->ro_rt->rt_rmx.rmx_mtu > ifp->if_mtu)) { + ro->ro_rt->rt_rmx.rmx_mtu = ifp->if_mtu; + } + RT_UNLOCK(ro->ro_rt); + } + if (pktcnt > 0) { + m0 = packetlist; } - ipstat.ips_cantfrag++; + OSAddAtomic(1, &ipstat.ips_cantfrag); goto bad; } - len = (ifp->if_mtu - hlen) &~ 7; - if (len < 8) { - error = EMSGSIZE; + + error = ip_fragment(m, ifp, ifp->if_mtu, sw_csum); + if (error != 0) { + m0 = m = NULL; goto bad; } - /* - * 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) { - lck_mtx_unlock(ip_mutex); - return(ENOMEM); + KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr, + ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); + + for (m = m0; m; m = m0) { + m0 = m->m_nextpkt; + m->m_nextpkt = 0; +#if IPSEC + /* clean ipsec history once it goes out of the node */ + if (ipsec_bypass == 0 && !(flags & IP_NOIPSEC)) + ipsec_delaux(m); +#endif /* IPSEC */ + if (error == 0) { + if ((packetchain != 0) && (pktcnt > 0)) { + panic("%s: mix of packet in packetlist is " + "wrong=%p", __func__, packetlist); + /* NOTREACHED */ + } + if (ro->ro_rt != NULL && nstat_collect) { + nstat_route_tx(ro->ro_rt, 1, + m->m_pkthdr.len, 0); + } + error = dlil_output(ifp, PF_INET, m, ro->ro_rt, + SA(dst), 0, adv); + if (dlil_verbose && error) { + printf("dlil_output error on interface %s: %d\n", + ifp->if_xname, error); + } + } else { + m_freem(m); } - m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA; } + if (error == 0) + OSAddAtomic(1, &ipstat.ips_fragmented); + +done: + if (ia != NULL) { + IFA_REMREF(&ia->ia_ifa); + ia = NULL; + } +#if IPSEC + ROUTE_RELEASE(&ipsec_state.ro); + if (sp != NULL) { + KEYDEBUG(KEYDEBUG_IPSEC_STAMP, + printf("DP ip_output call free SP:%x\n", sp)); + key_freesp(sp, KEY_SADB_UNLOCKED); + } +#endif /* IPSEC */ +#if NECP + ROUTE_RELEASE(&necp_route); +#endif /* NECP */ +#if DUMMYNET + ROUTE_RELEASE(&saved_route); +#endif /* DUMMYNET */ +#if IPFIREWALL_FORWARD + ROUTE_RELEASE(&sro_fwd); +#endif /* IPFIREWALL_FORWARD */ + + KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error, 0, 0, 0, 0); + if (ip_output_measure) { + net_perf_measure_time(&net_perf, &start_tv, packets_processed); + net_perf_histogram(&net_perf, packets_processed); + } + return (error); +bad: + if (pktcnt > 0) + m0 = packetlist; + m_freem_list(m0); + goto done; + +#undef ipsec_state +#undef args +#undef sro_fwd +#undef saved_route +#undef ipf_pktopts +#undef IP_CHECK_RESTRICTIONS +} - { - int mhlen, firstlen = len; - struct mbuf **mnext = &m->m_nextpkt; +int +ip_fragment(struct mbuf *m, struct ifnet *ifp, unsigned long mtu, int sw_csum) +{ + struct ip *ip, *mhip; + int len, hlen, mhlen, firstlen, off, error = 0; + struct mbuf **mnext = &m->m_nextpkt, *m0; int nfrags = 1; + ip = mtod(m, struct ip *); +#ifdef _IP_VHL + hlen = IP_VHL_HL(ip->ip_vhl) << 2; +#else /* !_IP_VHL */ + hlen = ip->ip_hl << 2; +#endif /* !_IP_VHL */ + + firstlen = len = (mtu - hlen) &~ 7; + if (len < 8) { + m_freem(m); + return (EMSGSIZE); + } + + /* + * if the interface will not calculate checksums on + * fragmented packets, then do it here. + */ + if ((m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) && + !(ifp->if_hwassist & CSUM_IP_FRAGS)) + in_delayed_cksum(m); + /* * Loop through length of segment after first fragment, * make new header and copy data of each part and link onto chain. @@ -1279,10 +2004,10 @@ pass: m0 = m; mhlen = sizeof (struct ip); for (off = hlen + len; off < (u_short)ip->ip_len; off += len) { - MGETHDR(m, M_DONTWAIT, MT_HEADER); - if (m == 0) { + MGETHDR(m, M_DONTWAIT, MT_HEADER); /* MAC-OK */ + if (m == NULL) { error = ENOBUFS; - ipstat.ips_odropped++; + OSAddAtomic(1, &ipstat.ips_odropped); goto sendorfree; } m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG; @@ -1303,26 +2028,37 @@ pass: mhip->ip_off |= IP_MF; mhip->ip_len = htons((u_short)(len + mhlen)); m->m_next = m_copy(m0, off, len); - if (m->m_next == 0) { + if (m->m_next == NULL) { (void) m_free(m); error = ENOBUFS; /* ??? */ - ipstat.ips_odropped++; + OSAddAtomic(1, &ipstat.ips_odropped); goto sendorfree; } m->m_pkthdr.len = mhlen + len; - m->m_pkthdr.rcvif = 0; + m->m_pkthdr.rcvif = NULL; m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags; - m->m_pkthdr.socket_id = m0->m_pkthdr.socket_id; + + M_COPY_CLASSIFIER(m, m0); + M_COPY_PFTAG(m, m0); + +#if CONFIG_MACF_NET + mac_netinet_fragment(m0, m); +#endif /* CONFIG_MACF_NET */ + +#if BYTE_ORDER != BIG_ENDIAN HTONS(mhip->ip_off); +#endif + mhip->ip_sum = 0; if (sw_csum & CSUM_DELAY_IP) { - mhip->ip_sum = in_cksum(m, mhlen); + mhip->ip_sum = ip_cksum_hdr_out(m, mhlen); + m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IP; } *mnext = m; mnext = &m->m_nextpkt; nfrags++; } - ipstat.ips_ofragments += nfrags; + OSAddAtomic(nfrags, &ipstat.ips_ofragments); /* set first/last markers for fragment chain */ m->m_flags |= M_LASTFRAG; @@ -1338,191 +2074,214 @@ pass: m->m_pkthdr.len = hlen + firstlen; ip->ip_len = htons((u_short)m->m_pkthdr.len); ip->ip_off |= IP_MF; + +#if BYTE_ORDER != BIG_ENDIAN HTONS(ip->ip_off); +#endif + ip->ip_sum = 0; if (sw_csum & CSUM_DELAY_IP) { - ip->ip_sum = in_cksum(m, hlen); + ip->ip_sum = ip_cksum_hdr_out(m, hlen); + m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IP; } sendorfree: + if (error) + m_freem_list(m0); - KERNEL_DEBUG(DBG_LAYER_END, ip->ip_dst.s_addr, - ip->ip_src.s_addr, ip->ip_p, ip->ip_off, ip->ip_len); - - lck_mtx_unlock(ip_mutex); - 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=%x", packetlist); - error = dlil_output(ifp, PF_INET, m, (void *) ro->ro_rt, - (struct sockaddr *)dst, 0); - } else - m_freem(m); - } - - if (error == 0) - 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)); - lck_mtx_lock(sadb_mutex); - key_freesp(sp); - lck_mtx_unlock(sadb_mutex); - } - } -#endif /* IPSEC */ - - KERNEL_DEBUG(DBG_FNC_IP_OUTPUT | DBG_FUNC_END, error,0,0,0,0); return (error); -bad: - m_freem(m0); - lck_mtx_unlock(ip_mutex); - goto done; } -void -in_delayed_cksum_offset(struct mbuf *m, int ip_offset) +static void +ip_out_cksum_stats(int proto, u_int32_t len) { - struct ip *ip; - u_short csum, offset; - - while (ip_offset > m->m_len) { - ip_offset -= m->m_len; - m = m->m_next; - if (m) { - printf("in_delayed_cksum_withoffset failed - ip_offset wasn't in the packet\n"); - return; - } + 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 (ip_offset + sizeof(struct ip) > m->m_len) { - printf("delayed m_pullup, m->len: %d off: %d\n", - m->m_len, ip_offset); - /* - * XXX - * this shouldn't happen - */ - m = m_pullup(m, ip_offset + sizeof(struct ip)); +} + +/* + * Process a delayed payload checksum calculation (outbound path.) + * + * hoff is the number of bytes beyond the mbuf data pointer which + * points to the IP header. + * + * Returns a bitmask representing all the work done in software. + */ +uint32_t +in_finalize_cksum(struct mbuf *m, uint32_t hoff, uint32_t csum_flags) +{ + unsigned char buf[15 << 2] __attribute__((aligned(8))); + struct ip *ip; + uint32_t offset, _hlen, mlen, hlen, len, sw_csum; + uint16_t csum, ip_len; + + _CASSERT(sizeof (csum) == sizeof (uint16_t)); + VERIFY(m->m_flags & M_PKTHDR); + + sw_csum = (csum_flags & m->m_pkthdr.csum_flags); + + if ((sw_csum &= (CSUM_DELAY_IP | CSUM_DELAY_DATA)) == 0) + goto done; + + mlen = m->m_pkthdr.len; /* total mbuf len */ + + /* sanity check (need at least simple IP header) */ + if (mlen < (hoff + sizeof (*ip))) { + panic("%s: mbuf %p pkt len (%u) < hoff+ip_hdr " + "(%u+%u)\n", __func__, m, mlen, hoff, + (uint32_t)sizeof (*ip)); + /* NOTREACHED */ } - - /* Gross */ - if (ip_offset) { - m->m_len -= ip_offset; - m->m_data += ip_offset; + + /* + * In case the IP header is not contiguous, or not 32-bit aligned, + * or if we're computing the IP header checksum, copy it to a local + * buffer. Copy only the simple IP header here (IP options case + * is handled below.) + */ + if ((sw_csum & CSUM_DELAY_IP) || (hoff + sizeof (*ip)) > m->m_len || + !IP_HDR_ALIGNED_P(mtod(m, caddr_t) + hoff)) { + m_copydata(m, hoff, sizeof (*ip), (caddr_t)buf); + ip = (struct ip *)(void *)buf; + _hlen = sizeof (*ip); + } else { + ip = (struct ip *)(void *)(m->m_data + hoff); + _hlen = 0; } - - ip = mtod(m, struct ip*); - offset = IP_VHL_HL(ip->ip_vhl) << 2 ; - csum = in_cksum_skip(m, ip->ip_len, offset); - if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0) - csum = 0xffff; - offset += m->m_pkthdr.csum_data & 0xFFFF; /* checksum offset */ - - /* Gross */ - if (ip_offset) { - if (M_LEADINGSPACE(m) < ip_offset) - panic("in_delayed_cksum_withoffset - chain modified!\n"); - m->m_len += ip_offset; - m->m_data -= ip_offset; + + hlen = IP_VHL_HL(ip->ip_vhl) << 2; /* IP header len */ + + /* sanity check */ + if (mlen < (hoff + hlen)) { + panic("%s: mbuf %p pkt too short (%d) for IP header (%u), " + "hoff %u", __func__, m, mlen, hlen, hoff); + /* NOTREACHED */ } - if (offset > ip->ip_len) /* bogus offset */ - return; + /* + * We could be in the context of an IP or interface filter; in the + * former case, ip_len would be in host (correct) order while for + * the latter it would be in network order. Because of this, we + * attempt to interpret the length field by comparing it against + * the actual packet length. If the comparison fails, byte swap + * the length and check again. If it still fails, use the actual + * packet length. This also covers the trailing bytes case. + */ + ip_len = ip->ip_len; + if (ip_len != (mlen - hoff)) { + ip_len = OSSwapInt16(ip_len); + if (ip_len != (mlen - hoff)) { + printf("%s: mbuf 0x%llx proto %d IP len %d (%x) " + "[swapped %d (%x)] doesn't match actual packet " + "length; %d is used instead\n", __func__, + (uint64_t)VM_KERNEL_ADDRPERM(m), ip->ip_p, + ip->ip_len, ip->ip_len, ip_len, ip_len, + (mlen - hoff)); + ip_len = mlen - hoff; + } + } + + len = ip_len - hlen; /* csum span */ + + if (sw_csum & CSUM_DELAY_DATA) { + uint16_t ulpoff; - if (offset + ip_offset + sizeof(u_short) > m->m_len) { - printf("delayed m_pullup, m->len: %d off: %d p: %d\n", - m->m_len, offset + ip_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. + * offset is added to the lower 16-bit value of csum_data, + * which is expected to contain the ULP offset; therefore + * CSUM_PARTIAL offset adjustment must be undone. */ - m = m_pullup(m, offset + ip_offset + sizeof(u_short)); - } - *(u_short *)(m->m_data + offset + ip_offset) = csum; -} + if ((m->m_pkthdr.csum_flags & (CSUM_PARTIAL|CSUM_DATA_VALID)) == + (CSUM_PARTIAL|CSUM_DATA_VALID)) { + /* + * Get back the original ULP offset (this will + * undo the CSUM_PARTIAL logic in ip_output.) + */ + m->m_pkthdr.csum_data = (m->m_pkthdr.csum_tx_stuff - + m->m_pkthdr.csum_tx_start); + } -void -in_delayed_cksum(struct mbuf *m) -{ - in_delayed_cksum_offset(m, 0); -} + ulpoff = (m->m_pkthdr.csum_data & 0xffff); /* ULP csum offset */ + offset = hoff + hlen; /* ULP header */ -void -in_cksum_offset(struct mbuf* m, size_t ip_offset) -{ - struct ip* ip = NULL; - int hlen = 0; - - while (ip_offset > m->m_len) { - ip_offset -= m->m_len; - m = m->m_next; - if (m) { - printf("in_cksum_offset failed - ip_offset wasn't in the packet\n"); - return; + if (mlen < (ulpoff + sizeof (csum))) { + panic("%s: mbuf %p pkt len (%u) proto %d invalid ULP " + "cksum offset (%u) cksum flags 0x%x\n", __func__, + m, mlen, ip->ip_p, ulpoff, m->m_pkthdr.csum_flags); + /* NOTREACHED */ } + + csum = inet_cksum(m, 0, offset, len); + + /* Update stats */ + ip_out_cksum_stats(ip->ip_p, len); + + /* RFC1122 4.1.3.4 */ + if (csum == 0 && (m->m_pkthdr.csum_flags & CSUM_UDP)) + csum = 0xffff; + + /* Insert the checksum in the ULP csum field */ + offset += ulpoff; + if (offset + sizeof (csum) > m->m_len) { + m_copyback(m, offset, sizeof (csum), &csum); + } else if (IP_HDR_ALIGNED_P(mtod(m, char *) + hoff)) { + *(uint16_t *)(void *)(mtod(m, char *) + offset) = csum; + } else { + bcopy(&csum, (mtod(m, char *) + offset), sizeof (csum)); + } + m->m_pkthdr.csum_flags &= + ~(CSUM_DELAY_DATA | CSUM_DATA_VALID | CSUM_PARTIAL); } - - if (ip_offset + sizeof(struct ip) > m->m_len) { - printf("in_cksum_offset - delayed m_pullup, m->len: %d off: %d\n", - m->m_len, ip_offset); + + if (sw_csum & CSUM_DELAY_IP) { + /* IP header must be in the local buffer */ + VERIFY(_hlen == sizeof (*ip)); + if (_hlen != hlen) { + VERIFY(hlen <= sizeof (buf)); + m_copydata(m, hoff, hlen, (caddr_t)buf); + ip = (struct ip *)(void *)buf; + _hlen = hlen; + } + /* - * XXX - * this shouldn't happen + * Compute the IP header checksum as if the IP length + * is the length which we believe is "correct"; see + * how ip_len gets calculated above. Note that this + * is done on the local copy and not on the real one. */ - m = m_pullup(m, ip_offset + sizeof(struct ip)); - } - - /* Gross */ - if (ip_offset) { - m->m_len -= ip_offset; - m->m_data += ip_offset; - } + ip->ip_len = htons(ip_len); + ip->ip_sum = 0; + csum = in_cksum_hdr_opt(ip); - ip = mtod(m, struct ip*); + /* Update stats */ + ipstat.ips_snd_swcsum++; + ipstat.ips_snd_swcsum_bytes += hlen; -#ifdef _IP_VHL - hlen = IP_VHL_HL(ip->ip_vhl) << 2; -#else - hlen = ip->ip_hl << 2; -#endif - - ip->ip_sum = 0; - ip->ip_sum = in_cksum(m, hlen); - - /* 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 only the checksum in the existing IP header + * csum field; all other fields are left unchanged. + */ + offset = hoff + offsetof(struct ip, ip_sum); + if (offset + sizeof (csum) > m->m_len) { + m_copyback(m, offset, sizeof (csum), &csum); + } else if (IP_HDR_ALIGNED_P(mtod(m, char *) + hoff)) { + *(uint16_t *)(void *)(mtod(m, char *) + offset) = csum; + } else { + bcopy(&csum, (mtod(m, char *) + offset), sizeof (csum)); + } + m->m_pkthdr.csum_flags &= ~CSUM_DELAY_IP; } + +done: + return (sw_csum); } /* @@ -1533,43 +2292,43 @@ in_cksum_offset(struct mbuf* m, size_t ip_offset) * XXX This routine assumes that the packet has no options in place. */ static struct mbuf * -ip_insertoptions(m, opt, phlen) - register struct mbuf *m; - struct mbuf *opt; - int *phlen; +ip_insertoptions(struct mbuf *m, struct mbuf *opt, int *phlen) { - register struct ipoption *p = mtod(opt, struct ipoption *); + struct ipoption *p = mtod(opt, struct ipoption *); struct mbuf *n; - register struct ip *ip = mtod(m, struct ip *); + struct ip *ip = mtod(m, struct ip *); unsigned optlen; - optlen = opt->m_len - sizeof(p->ipopt_dst); + optlen = opt->m_len - sizeof (p->ipopt_dst); if (optlen + (u_short)ip->ip_len > IP_MAXPACKET) return (m); /* XXX should fail */ if (p->ipopt_dst.s_addr) ip->ip_dst = p->ipopt_dst; if (m->m_flags & M_EXT || m->m_data - optlen < m->m_pktdat) { - MGETHDR(n, M_DONTWAIT, MT_HEADER); - if (n == 0) + MGETHDR(n, M_DONTWAIT, MT_HEADER); /* MAC-OK */ + if (n == NULL) return (m); n->m_pkthdr.rcvif = 0; +#if CONFIG_MACF_NET + mac_mbuf_label_copy(m, n); +#endif /* CONFIG_MACF_NET */ n->m_pkthdr.len = m->m_pkthdr.len + optlen; - m->m_len -= sizeof(struct ip); - m->m_data += sizeof(struct ip); + m->m_len -= sizeof (struct ip); + m->m_data += sizeof (struct ip); n->m_next = m; m = n; - m->m_len = optlen + sizeof(struct ip); + m->m_len = optlen + sizeof (struct ip); m->m_data += max_linkhdr; - (void)memcpy(mtod(m, void *), ip, sizeof(struct ip)); + (void) memcpy(mtod(m, void *), ip, sizeof (struct ip)); } else { m->m_data -= optlen; m->m_len += optlen; m->m_pkthdr.len += optlen; - ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); + ovbcopy((caddr_t)ip, mtod(m, caddr_t), sizeof (struct ip)); } ip = mtod(m, struct ip *); bcopy(p->ipopt_list, ip + 1, optlen); - *phlen = sizeof(struct ip) + optlen; + *phlen = sizeof (struct ip) + optlen; ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2); ip->ip_len += optlen; return (m); @@ -1579,11 +2338,10 @@ ip_insertoptions(m, opt, phlen) * Copy options from ip to jp, * omitting those not copied during fragmentation. */ -int -ip_optcopy(ip, jp) - struct ip *ip, *jp; +static int +ip_optcopy(struct ip *ip, struct ip *jp) { - register u_char *cp, *dp; + u_char *cp, *dp; int opt, optlen, cnt; cp = (u_char *)(ip + 1); @@ -1600,13 +2358,17 @@ ip_optcopy(ip, jp) continue; } #if DIAGNOSTIC - if (cnt < IPOPT_OLEN + sizeof(*cp)) + if (cnt < IPOPT_OLEN + sizeof (*cp)) { panic("malformed IPv4 option passed to ip_optcopy"); + /* NOTREACHED */ + } #endif optlen = cp[IPOPT_OLEN]; #if DIAGNOSTIC - if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) + if (optlen < IPOPT_OLEN + sizeof (*cp) || optlen > cnt) { panic("malformed IPv4 option passed to ip_optcopy"); + /* NOTREACHED */ + } #endif /* bogus lengths should have been caught by ip_dooptions */ if (optlen > cnt) @@ -1625,44 +2387,42 @@ ip_optcopy(ip, jp) * IP socket option processing. */ int -ip_ctloutput(so, sopt) - struct socket *so; - struct sockopt *sopt; +ip_ctloutput(struct socket *so, struct sockopt *sopt) { struct inpcb *inp = sotoinpcb(so); int error, optval; error = optval = 0; - if (sopt->sopt_level != IPPROTO_IP) { + if (sopt->sopt_level != IPPROTO_IP) return (EINVAL); - } switch (sopt->sopt_dir) { case SOPT_SET: switch (sopt->sopt_name) { - case IP_OPTIONS: #ifdef notyet case IP_RETOPTS: #endif - { + case IP_OPTIONS: { struct mbuf *m; + if (sopt->sopt_valsize > MLEN) { error = EMSGSIZE; break; } - MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER); - if (m == 0) { + MGET(m, sopt->sopt_p != kernproc ? M_WAIT : M_DONTWAIT, + MT_HEADER); + if (m == NULL) { error = ENOBUFS; break; } m->m_len = sopt->sopt_valsize; - error = sooptcopyin(sopt, mtod(m, char *), m->m_len, - m->m_len); + 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)); + + return (ip_pcbopts(sopt->sopt_name, + &inp->inp_options, m)); } case IP_TOS: @@ -1672,11 +2432,9 @@ ip_ctloutput(so, sopt) 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); + case IP_RECVPKTINFO: + error = sooptcopyin(sopt, &optval, sizeof (optval), + sizeof (optval)); if (error) break; @@ -1714,27 +2472,104 @@ ip_ctloutput(so, sopt) OPTSET(INP_RECVTTL); break; -#if defined(NFAITH) && NFAITH > 0 - case IP_FAITH: - OPTSET(INP_FAITH); + case IP_RECVPKTINFO: + OPTSET(INP_PKTINFO); break; -#endif } break; #undef OPTSET +#if CONFIG_FORCE_OUT_IFP + /* + * Apple private interface, similar to IP_BOUND_IF, except + * that the parameter is a NULL-terminated string containing + * the name of the network interface; an emptry string means + * unbind. Applications are encouraged to use IP_BOUND_IF + * instead, as that is the current "official" API. + */ + case IP_FORCE_OUT_IFP: { + char ifname[IFNAMSIZ]; + unsigned int ifscope; + + /* This option is settable only for IPv4 */ + if (!(inp->inp_vflag & INP_IPV4)) { + error = EINVAL; + break; + } + + /* Verify interface name parameter is sane */ + if (sopt->sopt_valsize > sizeof (ifname)) { + error = EINVAL; + break; + } + + /* Copy the interface name */ + if (sopt->sopt_valsize != 0) { + error = sooptcopyin(sopt, ifname, + sizeof (ifname), sopt->sopt_valsize); + if (error) + break; + } + + if (sopt->sopt_valsize == 0 || ifname[0] == '\0') { + /* Unbind this socket from any interface */ + ifscope = IFSCOPE_NONE; + } else { + ifnet_t ifp; + + /* Verify name is NULL terminated */ + if (ifname[sopt->sopt_valsize - 1] != '\0') { + error = EINVAL; + break; + } + + /* Bail out if given bogus interface name */ + if (ifnet_find_by_name(ifname, &ifp) != 0) { + error = ENXIO; + break; + } + + /* Bind this socket to this interface */ + ifscope = ifp->if_index; + + /* + * Won't actually free; since we don't release + * this later, we should do it now. + */ + ifnet_release(ifp); + } + error = inp_bindif(inp, ifscope, NULL); + } + break; +#endif /* CONFIG_FORCE_OUT_IFP */ + /* + * Multicast socket options are processed by the in_mcast + * module. + */ case IP_MULTICAST_IF: + case IP_MULTICAST_IFINDEX: case IP_MULTICAST_VIF: case IP_MULTICAST_TTL: case IP_MULTICAST_LOOP: case IP_ADD_MEMBERSHIP: case IP_DROP_MEMBERSHIP: - error = ip_setmoptions(sopt, &inp->inp_moptions); + case IP_ADD_SOURCE_MEMBERSHIP: + case IP_DROP_SOURCE_MEMBERSHIP: + case IP_BLOCK_SOURCE: + case IP_UNBLOCK_SOURCE: + case IP_MSFILTER: + case MCAST_JOIN_GROUP: + case MCAST_LEAVE_GROUP: + case MCAST_JOIN_SOURCE_GROUP: + case MCAST_LEAVE_SOURCE_GROUP: + case MCAST_BLOCK_SOURCE: + case MCAST_UNBLOCK_SOURCE: + error = inp_setmoptions(inp, sopt); break; case IP_PORTRANGE: - error = sooptcopyin(sopt, &optval, sizeof optval, - sizeof optval); + error = sooptcopyin(sopt, &optval, sizeof (optval), + sizeof (optval)); if (error) break; @@ -1761,36 +2596,111 @@ ip_ctloutput(so, sopt) break; #if IPSEC - case IP_IPSEC_POLICY: - { + 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; + priv = (proc_suser(sopt->sopt_p) == 0); if (m) { req = mtod(m, caddr_t); len = m->m_len; } optname = sopt->sopt_name; - lck_mtx_lock(sadb_mutex); error = ipsec4_set_policy(inp, optname, req, len, priv); - lck_mtx_unlock(sadb_mutex); m_freem(m); break; } -#endif /*IPSEC*/ +#endif /* IPSEC */ + +#if TRAFFIC_MGT + case IP_TRAFFIC_MGT_BACKGROUND: { + unsigned background = 0; + + error = sooptcopyin(sopt, &background, + sizeof (background), sizeof (background)); + if (error) + break; + + if (background) { + socket_set_traffic_mgt_flags_locked(so, + TRAFFIC_MGT_SO_BACKGROUND); + } else { + socket_clear_traffic_mgt_flags_locked(so, + TRAFFIC_MGT_SO_BACKGROUND); + } + + break; + } +#endif /* TRAFFIC_MGT */ + + /* + * On a multihomed system, scoped routing can be used to + * restrict the source interface used for sending packets. + * The socket option IP_BOUND_IF binds a particular AF_INET + * socket to an interface such that data sent on the socket + * is restricted to that interface. This is unlike the + * SO_DONTROUTE option where the routing table is bypassed; + * therefore it allows for a greater flexibility and control + * over the system behavior, and does not place any restriction + * on the destination address type (e.g. unicast, multicast, + * or broadcast if applicable) or whether or not the host is + * directly reachable. Note that in the multicast transmit + * case, IP_MULTICAST_{IF,IFINDEX} takes precedence over + * IP_BOUND_IF, since the former practically bypasses the + * routing table; in this case, IP_BOUND_IF sets the default + * interface used for sending multicast packets in the absence + * of an explicit multicast transmit interface. + */ + case IP_BOUND_IF: + /* This option is settable only for IPv4 */ + if (!(inp->inp_vflag & INP_IPV4)) { + error = EINVAL; + break; + } + + error = sooptcopyin(sopt, &optval, sizeof (optval), + sizeof (optval)); + + if (error) + break; + + error = inp_bindif(inp, optval, NULL); + break; + + case IP_NO_IFT_CELLULAR: + /* This option is settable only for IPv4 */ + if (!(inp->inp_vflag & INP_IPV4)) { + error = EINVAL; + break; + } + + error = sooptcopyin(sopt, &optval, sizeof (optval), + sizeof (optval)); + + if (error) + break; + + /* once set, it cannot be unset */ + if (!optval && INP_NO_CELLULAR(inp)) { + error = EINVAL; + break; + } + + error = so_set_restrictions(so, + SO_RESTRICT_DENY_CELLULAR); + break; + + case IP_OUT_IF: + /* This option is not settable */ + error = EINVAL; + break; default: error = ENOPROTOOPT; @@ -1802,13 +2712,13 @@ ip_ctloutput(so, sopt) switch (sopt->sopt_name) { case IP_OPTIONS: case IP_RETOPTS: - if (inp->inp_options) - error = sooptcopyout(sopt, - mtod(inp->inp_options, - char *), - inp->inp_options->m_len); - else + if (inp->inp_options) { + error = sooptcopyout(sopt, + mtod(inp->inp_options, char *), + inp->inp_options->m_len); + } else { sopt->sopt_valsize = 0; + } break; case IP_TOS: @@ -1819,9 +2729,7 @@ ip_ctloutput(so, sopt) case IP_RECVIF: case IP_RECVTTL: case IP_PORTRANGE: -#if defined(NFAITH) && NFAITH > 0 - case IP_FAITH: -#endif + case IP_RECVPKTINFO: switch (sopt->sopt_name) { case IP_TOS: @@ -1863,45 +2771,55 @@ ip_ctloutput(so, sopt) optval = 0; break; -#if defined(NFAITH) && NFAITH > 0 - case IP_FAITH: - optval = OPTBIT(INP_FAITH); + case IP_RECVPKTINFO: + optval = OPTBIT(INP_PKTINFO); break; -#endif } - error = sooptcopyout(sopt, &optval, sizeof optval); + error = sooptcopyout(sopt, &optval, sizeof (optval)); break; case IP_MULTICAST_IF: + case IP_MULTICAST_IFINDEX: case IP_MULTICAST_VIF: case IP_MULTICAST_TTL: case IP_MULTICAST_LOOP: - case IP_ADD_MEMBERSHIP: - case IP_DROP_MEMBERSHIP: - error = ip_getmoptions(sopt, inp->inp_moptions); + case IP_MSFILTER: + error = inp_getmoptions(inp, sopt); break; #if IPSEC - case IP_IPSEC_POLICY: - { - struct mbuf *m = NULL; - caddr_t req = NULL; - size_t len = 0; + case IP_IPSEC_POLICY: { + error = 0; /* This option is no longer supported */ + break; + } +#endif /* IPSEC */ - if (m != 0) { - req = mtod(m, caddr_t); - len = m->m_len; - } - lck_mtx_lock(sadb_mutex); - error = ipsec4_get_policy(sotoinpcb(so), req, len, &m); - lck_mtx_unlock(sadb_mutex); - if (error == 0) - error = soopt_mcopyout(sopt, m); /* XXX */ - if (error == 0) - m_freem(m); +#if TRAFFIC_MGT + case IP_TRAFFIC_MGT_BACKGROUND: { + unsigned background = (so->so_traffic_mgt_flags & + TRAFFIC_MGT_SO_BACKGROUND) ? 1 : 0; + return (sooptcopyout(sopt, &background, + sizeof (background))); break; } -#endif /*IPSEC*/ +#endif /* TRAFFIC_MGT */ + + case IP_BOUND_IF: + if (inp->inp_flags & INP_BOUND_IF) + optval = inp->inp_boundifp->if_index; + error = sooptcopyout(sopt, &optval, sizeof (optval)); + break; + + case IP_NO_IFT_CELLULAR: + optval = INP_NO_CELLULAR(inp) ? 1 : 0; + error = sooptcopyout(sopt, &optval, sizeof (optval)); + break; + + case IP_OUT_IF: + optval = (inp->inp_last_outifp != NULL) ? + inp->inp_last_outifp->if_index : 0; + error = sooptcopyout(sopt, &optval, sizeof (optval)); + break; default: error = ENOPROTOOPT; @@ -1918,44 +2836,41 @@ ip_ctloutput(so, sopt) * with destination address if source routed. */ static int -ip_pcbopts(optname, pcbopt, m) - int optname; - struct mbuf **pcbopt; - register struct mbuf *m; +ip_pcbopts(int optname, struct mbuf **pcbopt, struct mbuf *m) { - register int cnt, optlen; - register u_char *cp; +#pragma unused(optname) + int cnt, optlen; + u_char *cp; u_char opt; /* turn off any old options */ if (*pcbopt) - (void)m_free(*pcbopt); + (void) m_free(*pcbopt); *pcbopt = 0; if (m == (struct mbuf *)0 || m->m_len == 0) { /* * Only turning off any previous options. */ if (m) - (void)m_free(m); + (void) m_free(m); return (0); } -#ifndef vax - if (m->m_len % sizeof(int32_t)) + if (m->m_len % sizeof (int32_t)) goto bad; -#endif + /* * IP first-hop destination address will be stored before * actual options; move other options back * and clear it when none present. */ - if (m->m_data + m->m_len + sizeof(struct in_addr) >= &m->m_dat[MLEN]) + if (m->m_data + m->m_len + sizeof (struct in_addr) >= &m->m_dat[MLEN]) goto bad; cnt = m->m_len; - m->m_len += sizeof(struct in_addr); - cp = mtod(m, u_char *) + sizeof(struct in_addr); + m->m_len += sizeof (struct in_addr); + cp = mtod(m, u_char *) + sizeof (struct in_addr); ovbcopy(mtod(m, caddr_t), (caddr_t)cp, (unsigned)cnt); - bzero(mtod(m, caddr_t), sizeof(struct in_addr)); + bzero(mtod(m, caddr_t), sizeof (struct in_addr)); for (; cnt > 0; cnt -= optlen, cp += optlen) { opt = cp[IPOPT_OPTVAL]; @@ -1964,10 +2879,10 @@ ip_pcbopts(optname, pcbopt, m) if (opt == IPOPT_NOP) optlen = 1; else { - if (cnt < IPOPT_OLEN + sizeof(*cp)) + if (cnt < IPOPT_OLEN + sizeof (*cp)) goto bad; optlen = cp[IPOPT_OLEN]; - if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) + if (optlen < IPOPT_OLEN + sizeof (*cp) || optlen > cnt) goto bad; } switch (opt) { @@ -1985,587 +2900,681 @@ ip_pcbopts(optname, pcbopt, m) * A is first hop destination, which doesn't appear in * actual IP option, but is stored before the options. */ - if (optlen < IPOPT_MINOFF - 1 + sizeof(struct in_addr)) + if (optlen < IPOPT_MINOFF - 1 + sizeof (struct in_addr)) goto bad; - m->m_len -= sizeof(struct in_addr); - cnt -= sizeof(struct in_addr); - optlen -= sizeof(struct in_addr); + m->m_len -= sizeof (struct in_addr); + cnt -= sizeof (struct in_addr); + optlen -= sizeof (struct in_addr); cp[IPOPT_OLEN] = optlen; /* * Move first hop before start of options. */ bcopy((caddr_t)&cp[IPOPT_OFFSET+1], mtod(m, caddr_t), - sizeof(struct in_addr)); + sizeof (struct in_addr)); /* * Then copy rest of options back * to close up the deleted entry. */ ovbcopy((caddr_t)(&cp[IPOPT_OFFSET+1] + - sizeof(struct in_addr)), + sizeof (struct in_addr)), (caddr_t)&cp[IPOPT_OFFSET+1], - (unsigned)cnt + sizeof(struct in_addr)); + (unsigned)cnt + sizeof (struct in_addr)); break; } } - if (m->m_len > MAX_IPOPTLEN + sizeof(struct in_addr)) + if (m->m_len > MAX_IPOPTLEN + sizeof (struct in_addr)) goto bad; *pcbopt = m; return (0); bad: - (void)m_free(m); + (void) m_free(m); return (EINVAL); } -/* - * XXX - * The whole multicast option thing needs to be re-thought. - * Several of these options are equally applicable to non-multicast - * transmission, and one (IP_MULTICAST_TTL) totally duplicates a - * standard option (IP_TTL). - */ +void +ip_moptions_init(void) +{ + PE_parse_boot_argn("ifa_debug", &imo_debug, sizeof (imo_debug)); -/* - * following RFC1724 section 3.3, 0.0.0.0/8 is interpreted as interface index. - */ -static struct ifnet * -ip_multicast_if(a, ifindexp) - struct in_addr *a; - int *ifindexp; + imo_size = (imo_debug == 0) ? sizeof (struct ip_moptions) : + sizeof (struct ip_moptions_dbg); + + imo_zone = zinit(imo_size, IMO_ZONE_MAX * imo_size, 0, + IMO_ZONE_NAME); + if (imo_zone == NULL) { + panic("%s: failed allocating %s", __func__, IMO_ZONE_NAME); + /* NOTREACHED */ + } + zone_change(imo_zone, Z_EXPAND, TRUE); +} + +void +imo_addref(struct ip_moptions *imo, int locked) { - 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); + if (!locked) + IMO_LOCK(imo); + else + IMO_LOCK_ASSERT_HELD(imo); + + if (++imo->imo_refcnt == 0) { + panic("%s: imo %p wraparound refcnt\n", __func__, imo); + /* NOTREACHED */ + } else if (imo->imo_trace != NULL) { + (*imo->imo_trace)(imo, TRUE); } - return ifp; + + if (!locked) + IMO_UNLOCK(imo); } -/* - * Set the IP multicast options in response to user setsockopt(). - */ -static int -ip_setmoptions(sopt, imop) - struct sockopt *sopt; - struct ip_moptions **imop; +void +imo_remref(struct ip_moptions *imo) { - 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; + IMO_LOCK(imo); + if (imo->imo_refcnt == 0) { + panic("%s: imo %p negative refcnt", __func__, imo); + /* NOTREACHED */ + } else if (imo->imo_trace != NULL) { + (*imo->imo_trace)(imo, FALSE); } - switch (sopt->sopt_name) { - /* store an index number for the vif you wanna use in the send */ - case IP_MULTICAST_VIF: - if (legal_vif_num == 0) { - error = EOPNOTSUPP; - break; - } - error = sooptcopyin(sopt, &i, sizeof i, sizeof i); - if (error) - break; - if (!legal_vif_num(i) && (i != -1)) { - error = EINVAL; - break; - } - imo->imo_multicast_vif = i; - break; + --imo->imo_refcnt; + if (imo->imo_refcnt > 0) { + IMO_UNLOCK(imo); + return; + } - case IP_MULTICAST_IF: - /* - * Select the interface for outgoing multicast packets. - */ - error = sooptcopyin(sopt, &addr, sizeof addr, sizeof addr); - if (error) - break; - /* - * INADDR_ANY is used to remove a previous selection. - * When no interface is selected, a default one is - * chosen every time a multicast packet is sent. - */ - if (addr.s_addr == INADDR_ANY) { - imo->imo_multicast_ifp = NULL; - break; - } - /* - * The selected interface is identified by its local - * IP address. Find the interface and confirm that - * it supports multicasting. - */ - 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; + for (i = 0; i < imo->imo_num_memberships; ++i) { + struct in_mfilter *imf; - 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; + imf = imo->imo_mfilters ? &imo->imo_mfilters[i] : NULL; + if (imf != NULL) + imf_leave(imf); - 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; + (void) in_leavegroup(imo->imo_membership[i], imf); - case IP_ADD_MEMBERSHIP: - /* - * Add a multicast group membership. - * Group must be a valid IP multicast address. - */ - error = sooptcopyin(sopt, &mreq, sizeof mreq, sizeof mreq); - if (error) - break; - - error = ip_addmembership(imo, &mreq); - break; + if (imf != NULL) + imf_purge(imf); - 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; + INM_REMREF(imo->imo_membership[i]); + imo->imo_membership[i] = NULL; + } + imo->imo_num_memberships = 0; + if (imo->imo_mfilters != NULL) { + FREE(imo->imo_mfilters, M_INMFILTER); + imo->imo_mfilters = NULL; + } + if (imo->imo_membership != NULL) { + FREE(imo->imo_membership, M_IPMOPTS); + imo->imo_membership = NULL; + } + IMO_UNLOCK(imo); - default: - error = EOPNOTSUPP; - break; + lck_mtx_destroy(&imo->imo_lock, ifa_mtx_grp); + + if (!(imo->imo_debug & IFD_ALLOC)) { + panic("%s: imo %p cannot be freed", __func__, imo); + /* NOTREACHED */ } + zfree(imo_zone, imo); +} - /* - * If all options have default values, no need to keep the mbuf. - */ - if (imo->imo_multicast_ifp == NULL && - imo->imo_multicast_vif == -1 && - imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL && - imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP && - imo->imo_num_memberships == 0) { - FREE(*imop, M_IPMOPTS); - *imop = NULL; +static void +imo_trace(struct ip_moptions *imo, int refhold) +{ + struct ip_moptions_dbg *imo_dbg = (struct ip_moptions_dbg *)imo; + ctrace_t *tr; + u_int32_t idx; + u_int16_t *cnt; + + if (!(imo->imo_debug & IFD_DEBUG)) { + panic("%s: imo %p has no debug structure", __func__, imo); + /* NOTREACHED */ + } + if (refhold) { + cnt = &imo_dbg->imo_refhold_cnt; + tr = imo_dbg->imo_refhold; + } else { + cnt = &imo_dbg->imo_refrele_cnt; + tr = imo_dbg->imo_refrele; } - return (error); + idx = atomic_add_16_ov(cnt, 1) % IMO_TRACE_HIST_SIZE; + ctrace_record(&tr[idx]); } -/* - * Set the IP multicast options in response to user setsockopt(). - */ -__private_extern__ int -ip_createmoptions( - struct ip_moptions **imop) +struct ip_moptions * +ip_allocmoptions(int how) { 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; + + imo = (how == M_WAITOK) ? zalloc(imo_zone) : zalloc_noblock(imo_zone); + if (imo != NULL) { + bzero(imo, imo_size); + lck_mtx_init(&imo->imo_lock, ifa_mtx_grp, ifa_mtx_attr); + imo->imo_debug |= IFD_ALLOC; + if (imo_debug != 0) { + imo->imo_debug |= IFD_DEBUG; + imo->imo_trace = imo_trace; + } + IMO_ADDREF(imo); + } + + return (imo); } /* - * Add membership to an IPv4 multicast. + * 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. */ -__private_extern__ int -ip_addmembership( - struct ip_moptions *imo, - struct ip_mreq *mreq) +static void +ip_mloopback(struct ifnet *srcifp, struct ifnet *origifp, struct mbuf *m, + struct sockaddr_in *dst, int hlen) { - 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; - } + struct mbuf *copym; + struct ip *ip; + + if (lo_ifp == NULL) + return; + /* - * If no interface address was provided, use the interface of - * the route to the given multicast address. + * Copy the packet header as it's needed for the checksum + * Make sure to deep-copy IP header portion in case the data + * is in an mbuf cluster, so that we can safely override the IP + * header portion later. */ - if (mreq->imr_interface.s_addr == INADDR_ANY) { - bzero((caddr_t)&ro, sizeof(ro)); - dst = (struct sockaddr_in *)&ro.ro_dst; - dst->sin_len = sizeof(*dst); - dst->sin_family = AF_INET; - dst->sin_addr = mreq->imr_multiaddr; - rtalloc(&ro); - if (ro.ro_rt != NULL) { - ifp = ro.ro_rt->rt_ifp; - rtfree(ro.ro_rt); - } - else { - /* If there's no default route, try using loopback */ - mreq->imr_interface.s_addr = INADDR_LOOPBACK; - } - } - - if (ifp == NULL) { - ifp = ip_multicast_if(&mreq->imr_interface, NULL); - } + copym = m_copym_mode(m, 0, M_COPYALL, M_DONTWAIT, M_COPYM_COPY_HDR); + if (copym != NULL && ((copym->m_flags & M_EXT) || copym->m_len < hlen)) + copym = m_pullup(copym, hlen); + + if (copym == NULL) + return; /* - * See if we found an interface, and confirm that it - * supports multicast. + * We don't bother to fragment if the IP length is greater + * than the interface's MTU. Can this possibly matter? */ - if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { - error = EADDRNOTAVAIL; - return error; - } + ip = mtod(copym, struct ip *); +#if BYTE_ORDER != BIG_ENDIAN + HTONS(ip->ip_len); + HTONS(ip->ip_off); +#endif + ip->ip_sum = 0; + ip->ip_sum = ip_cksum_hdr_out(copym, hlen); + /* - * See if the membership already exists or if all the - * membership slots are full. + * Mark checksum as valid unless receive checksum offload is + * disabled; if so, compute checksum in software. If the + * interface itself is lo0, this will be overridden by if_loop. */ - 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; + if (hwcksum_rx) { + copym->m_pkthdr.csum_flags &= ~CSUM_PARTIAL; + copym->m_pkthdr.csum_flags |= + CSUM_DATA_VALID | CSUM_PSEUDO_HDR; + copym->m_pkthdr.csum_data = 0xffff; + } else if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { +#if BYTE_ORDER != BIG_ENDIAN + NTOHS(ip->ip_len); +#endif + in_delayed_cksum(copym); +#if BYTE_ORDER != BIG_ENDIAN + HTONS(ip->ip_len); +#endif } + + /* + * Stuff the 'real' ifp into the pkthdr, to be used in matching + * in ip_input(); we need the loopback ifp/dl_tag passed as args + * to make the loopback driver compliant with the data link + * requirements. + */ + copym->m_pkthdr.rcvif = origifp; + /* - * Everything looks good; add a new record to the multicast - * address list for the given interface. + * Also record the source interface (which owns the source address). + * This is basically a stripped down version of ifa_foraddr(). */ - if ((imo->imo_membership[i] = - in_addmulti(&mreq->imr_multiaddr, ifp)) == NULL) { - error = ENOBUFS; - return error; + if (srcifp == NULL) { + struct in_ifaddr *ia; + + lck_rw_lock_shared(in_ifaddr_rwlock); + TAILQ_FOREACH(ia, INADDR_HASH(ip->ip_src.s_addr), ia_hash) { + IFA_LOCK_SPIN(&ia->ia_ifa); + if (IA_SIN(ia)->sin_addr.s_addr == ip->ip_src.s_addr) { + srcifp = ia->ia_ifp; + IFA_UNLOCK(&ia->ia_ifa); + break; + } + IFA_UNLOCK(&ia->ia_ifa); + } + lck_rw_done(in_ifaddr_rwlock); } - ++imo->imo_num_memberships; - - return error; + if (srcifp != NULL) + ip_setsrcifaddr_info(copym, srcifp->if_index, NULL); + ip_setdstifaddr_info(copym, origifp->if_index, NULL); + + dlil_output(lo_ifp, PF_INET, copym, NULL, SA(dst), 0, NULL); } /* - * Drop membership of an IPv4 multicast. + * Given a source IP address (and route, if available), determine the best + * interface to send the packet from. Checking for (and updating) the + * ROF_SRCIF_SELECTED flag in the pcb-supplied route placeholder is done + * without any locks based on the assumption that ip_output() is single- + * threaded per-pcb, i.e. for any given pcb there can only be one thread + * performing output at the IP layer. + * + * This routine is analogous to in6_selectroute() for IPv6. */ -__private_extern__ int -ip_dropmembership( - struct ip_moptions *imo, - struct ip_mreq *mreq) +static struct ifaddr * +in_selectsrcif(struct ip *ip, struct route *ro, unsigned int ifscope) { - int error = 0; - struct ifnet* ifp = NULL; - int i; - - if (!IN_MULTICAST(ntohl(mreq->imr_multiaddr.s_addr))) { - error = EINVAL; - return error; + struct ifaddr *ifa = NULL; + struct in_addr src = ip->ip_src; + struct in_addr dst = ip->ip_dst; + struct ifnet *rt_ifp; + char s_src[MAX_IPv4_STR_LEN], s_dst[MAX_IPv4_STR_LEN]; + + VERIFY(src.s_addr != INADDR_ANY); + + if (ip_select_srcif_debug) { + (void) inet_ntop(AF_INET, &src.s_addr, s_src, sizeof (s_src)); + (void) inet_ntop(AF_INET, &dst.s_addr, s_dst, sizeof (s_dst)); } + if (ro->ro_rt != NULL) + RT_LOCK(ro->ro_rt); + + rt_ifp = (ro->ro_rt != NULL) ? ro->ro_rt->rt_ifp : NULL; + /* - * If an interface address was specified, get a pointer - * to its ifnet structure. + * 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 (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; + if (ifscope != IFSCOPE_NONE || ro->ro_rt != NULL) { + unsigned int scope = ifscope; + + /* + * If no scope is specified and the route is stale (pointing + * to a defunct interface) use the current primary interface; + * this happens when switching between interfaces configured + * with the same IP address. Otherwise pick up the scope + * information from the route; the ULP may have looked up a + * correct route and we just need to verify it here and mark + * it with the ROF_SRCIF_SELECTED flag below. + */ + if (scope == IFSCOPE_NONE) { + scope = rt_ifp->if_index; + if (scope != get_primary_ifscope(AF_INET) && + ROUTE_UNUSABLE(ro)) + scope = get_primary_ifscope(AF_INET); + } + + ifa = (struct ifaddr *)ifa_foraddr_scoped(src.s_addr, scope); + + if (ifa == NULL && ip->ip_p != IPPROTO_UDP && + ip->ip_p != IPPROTO_TCP && ipforwarding) { + /* + * If forwarding is enabled, and if the packet isn't + * TCP or UDP, check if the source address belongs + * to one of our own interfaces; if so, demote the + * interface scope and do a route lookup right below. + */ + ifa = (struct ifaddr *)ifa_foraddr(src.s_addr); + if (ifa != NULL) { + IFA_REMREF(ifa); + ifa = NULL; + ifscope = IFSCOPE_NONE; + } + } + + if (ip_select_srcif_debug && ifa != NULL) { + if (ro->ro_rt != NULL) { + printf("%s->%s ifscope %d->%d ifa_if %s " + "ro_if %s\n", s_src, s_dst, ifscope, + scope, if_name(ifa->ifa_ifp), + if_name(rt_ifp)); + } else { + printf("%s->%s ifscope %d->%d ifa_if %s\n", + s_src, s_dst, ifscope, scope, + if_name(ifa->ifa_ifp)); + } } } + /* - * Find the membership in the membership array. + * 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. */ - 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; + if (ifa == NULL && ifscope == IFSCOPE_NONE) { + ifa = (struct ifaddr *)ifa_foraddr(src.s_addr); + + /* + * 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, SA(&sin), NULL, + rt_tables[AF_INET], IFSCOPE_NONE)) != NULL) { + RT_LOCK(rt); + /* + * If the route uses a different interface, + * use that one instead. The IP address of + * the ifaddr that we pick up here is not + * relevant. + */ + if (ifa->ifa_ifp != rt->rt_ifp) { + oifa = ifa; + ifa = rt->rt_ifa; + IFA_ADDREF(ifa); + RT_UNLOCK(rt); + } else { + RT_UNLOCK(rt); + } + rtfree_locked(rt); + } + lck_mtx_unlock(rnh_lock); + + if (oifa != NULL) { + struct ifaddr *iifa; + + /* + * See if the interface pointed to by the + * route is configured with the source IP + * address of the packet. + */ + iifa = (struct ifaddr *)ifa_foraddr_scoped( + src.s_addr, ifa->ifa_ifp->if_index); + + if (iifa != NULL) { + /* + * Found it; drop the original one + * as well as the route interface + * address, and use this instead. + */ + IFA_REMREF(oifa); + IFA_REMREF(ifa); + ifa = iifa; + } else if (!ipforwarding || + (rt->rt_flags & RTF_GATEWAY)) { + /* + * This interface doesn't have that + * source IP address; drop the route + * interface address and just use the + * original one, and let the caller + * do a scoped route lookup. + */ + IFA_REMREF(ifa); + ifa = oifa; + } else { + /* + * Forwarding is enabled and the source + * address belongs to one of our own + * interfaces which isn't the outgoing + * interface, and we have a route, and + * the destination is on a network that + * is directly attached (onlink); drop + * the original one and use the route + * interface address instead. + */ + IFA_REMREF(oifa); + } + } + } else if (ifa != NULL && ro->ro_rt != NULL && + !(ro->ro_rt->rt_flags & RTF_GATEWAY) && + ifa->ifa_ifp != ro->ro_rt->rt_ifp && ipforwarding) { + /* + * Forwarding is enabled and the source address belongs + * to one of our own interfaces which isn't the same + * as the interface used by the known route; drop the + * original one and use the route interface address. + */ + IFA_REMREF(ifa); + ifa = ro->ro_rt->rt_ifa; + IFA_ADDREF(ifa); + } + + if (ip_select_srcif_debug && ifa != NULL) { + printf("%s->%s ifscope %d ifa_if %s\n", + s_src, s_dst, ifscope, if_name(ifa->ifa_ifp)); + } } + + if (ro->ro_rt != NULL) + RT_LOCK_ASSERT_HELD(ro->ro_rt); /* - * Give up the multicast address record to which the - * membership points. + * 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. */ - in_delmulti(&imo->imo_membership[i]); + if (ro->ro_rt != NULL && + (ifa == NULL || (ifa->ifa_ifp != rt_ifp && rt_ifp != lo_ifp) || + !(ro->ro_rt->rt_flags & RTF_UP))) { + if (ip_select_srcif_debug) { + if (ifa != NULL) { + printf("%s->%s ifscope %d ro_if %s != " + "ifa_if %s (cached route cleared)\n", + s_src, s_dst, ifscope, if_name(rt_ifp), + if_name(ifa->ifa_ifp)); + } else { + printf("%s->%s ifscope %d ro_if %s " + "(no ifa_if found)\n", + s_src, s_dst, ifscope, if_name(rt_ifp)); + } + } + + RT_UNLOCK(ro->ro_rt); + ROUTE_RELEASE(ro); + + /* + * If the destination is IPv4 LLA and the route's interface + * doesn't match the source interface, then the source IP + * address is wrong; it most likely belongs to the primary + * interface associated with the IPv4 LL subnet. Drop the + * packet rather than letting it go out and return an error + * to the ULP. This actually applies not only to IPv4 LL + * but other shared subnets; for now we explicitly test only + * for the former case and save the latter for future. + */ + if (IN_LINKLOCAL(ntohl(dst.s_addr)) && + !IN_LINKLOCAL(ntohl(src.s_addr)) && ifa != NULL) { + IFA_REMREF(ifa); + ifa = NULL; + } + } + + if (ip_select_srcif_debug && ifa == NULL) { + printf("%s->%s ifscope %d (neither ro_if/ifa_if found)\n", + s_src, s_dst, ifscope); + } + /* - * Remove the gap in the membership array. + * 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. */ - for (++i; i < imo->imo_num_memberships; ++i) - imo->imo_membership[i-1] = imo->imo_membership[i]; - --imo->imo_num_memberships; - - return error; + if (ro->ro_rt != NULL && (!IN_LINKLOCAL(ntohl(dst.s_addr)) || + (ro->ro_rt->rt_gateway->sa_family == AF_LINK && + SDL(ro->ro_rt->rt_gateway)->sdl_alen != 0))) { + if (ifa != NULL) + IFA_ADDREF(ifa); /* for route */ + if (ro->ro_srcia != NULL) + IFA_REMREF(ro->ro_srcia); + ro->ro_srcia = ifa; + ro->ro_flags |= ROF_SRCIF_SELECTED; + RT_GENID_SYNC(ro->ro_rt); + } + + if (ro->ro_rt != NULL) + RT_UNLOCK(ro->ro_rt); + + return (ifa); } -/* - * Return the IP multicast options in response to user getsockopt(). - */ -static int -ip_getmoptions(sopt, imo) - struct sockopt *sopt; - register struct ip_moptions *imo; +void +ip_output_checksum(struct ifnet *ifp, struct mbuf *m, int hlen, int ip_len, + uint32_t *sw_csum) { - struct in_addr addr; - struct in_ifaddr *ia; - int error, optval; - u_char coptval; + int tso = TSO_IPV4_OK(ifp, m); + uint32_t hwcap = ifp->if_hwassist; - error = 0; - switch (sopt->sopt_name) { - case IP_MULTICAST_VIF: - if (imo != NULL) - optval = imo->imo_multicast_vif; - else - optval = -1; - error = sooptcopyout(sopt, &optval, sizeof optval); - break; + m->m_pkthdr.csum_flags |= CSUM_IP; - case IP_MULTICAST_IF: - if (imo == NULL || imo->imo_multicast_ifp == NULL) - addr.s_addr = INADDR_ANY; - else if (imo->imo_multicast_addr.s_addr) { - /* return the value user has set */ - addr = imo->imo_multicast_addr; + if (!hwcksum_tx) { + /* do all in software; hardware checksum offload is disabled */ + *sw_csum = (CSUM_DELAY_DATA | CSUM_DELAY_IP) & + m->m_pkthdr.csum_flags; + } else { + /* do in software what the hardware cannot */ + *sw_csum = m->m_pkthdr.csum_flags & + ~IF_HWASSIST_CSUM_FLAGS(hwcap); + } + + if (hlen != sizeof (struct ip)) { + *sw_csum |= ((CSUM_DELAY_DATA | CSUM_DELAY_IP) & + m->m_pkthdr.csum_flags); + } else if (!(*sw_csum & CSUM_DELAY_DATA) && (hwcap & CSUM_PARTIAL)) { + /* + * Partial checksum offload, if non-IP fragment, and TCP only + * (no UDP support, as the hardware may not be able to convert + * +0 to -0 (0xffff) per RFC1122 4.1.3.4.) + */ + if (hwcksum_tx && !tso && + (m->m_pkthdr.csum_flags & CSUM_TCP) && + ip_len <= ifp->if_mtu) { + uint16_t start = sizeof (struct ip); + uint16_t ulpoff = m->m_pkthdr.csum_data & 0xffff; + m->m_pkthdr.csum_flags |= + (CSUM_DATA_VALID | CSUM_PARTIAL); + m->m_pkthdr.csum_tx_stuff = (ulpoff + start); + m->m_pkthdr.csum_tx_start = start; + /* do IP hdr chksum in software */ + *sw_csum = CSUM_DELAY_IP; } else { - IFP_TO_IA(imo->imo_multicast_ifp, ia); - addr.s_addr = (ia == NULL) ? INADDR_ANY - : IA_SIN(ia)->sin_addr.s_addr; + *sw_csum |= (CSUM_DELAY_DATA & m->m_pkthdr.csum_flags); } - error = sooptcopyout(sopt, &addr, sizeof addr); - break; - - case IP_MULTICAST_TTL: - if (imo == 0) - optval = coptval = IP_DEFAULT_MULTICAST_TTL; - else - optval = coptval = imo->imo_multicast_ttl; - if (sopt->sopt_valsize == 1) - error = sooptcopyout(sopt, &coptval, 1); - else - error = sooptcopyout(sopt, &optval, sizeof optval); - break; - - case IP_MULTICAST_LOOP: - if (imo == 0) - optval = coptval = IP_DEFAULT_MULTICAST_LOOP; - else - optval = coptval = imo->imo_multicast_loop; - if (sopt->sopt_valsize == 1) - error = sooptcopyout(sopt, &coptval, 1); - else - error = sooptcopyout(sopt, &optval, sizeof optval); - break; - - default: - error = ENOPROTOOPT; - break; } - return (error); -} -/* - * Discard the IP multicast options. - */ -void -ip_freemoptions(imo) - register struct ip_moptions *imo; -{ - register int i; + if (*sw_csum & CSUM_DELAY_DATA) { + in_delayed_cksum(m); + *sw_csum &= ~CSUM_DELAY_DATA; + } - if (imo != NULL) { - for (i = 0; i < imo->imo_num_memberships; ++i) - in_delmulti(&imo->imo_membership[i]); - FREE(imo, M_IPMOPTS); + if (hwcksum_tx) { + /* + * Drop off bits that aren't supported by hardware; + * also make sure to preserve non-checksum related bits. + */ + m->m_pkthdr.csum_flags = + ((m->m_pkthdr.csum_flags & + (IF_HWASSIST_CSUM_FLAGS(hwcap) | CSUM_DATA_VALID)) | + (m->m_pkthdr.csum_flags & ~IF_HWASSIST_CSUM_MASK)); + } else { + /* drop all bits; hardware checksum offload is disabled */ + m->m_pkthdr.csum_flags = 0; } } /* - * Routine called from ip_output() to loop back a copy of an IP multicast - * packet to the input queue of a specified interface. Note that this - * calls the output routine of the loopback "driver", but with an interface - * pointer that might NOT be a loopback interface -- evil, but easier than - * replicating that code here. + * GRE protocol output for PPP/PPTP */ -static void -ip_mloopback(ifp, m, dst, hlen) - struct ifnet *ifp; - register struct mbuf *m; - register struct sockaddr_in *dst; - int hlen; +int +ip_gre_output(struct mbuf *m) { - register struct ip *ip; - struct mbuf *copym; + struct route ro; + int error; - copym = m_copy(m, 0, M_COPYALL); - if (copym != NULL && (copym->m_flags & M_EXT || copym->m_len < hlen)) - copym = m_pullup(copym, hlen); - if (copym != NULL) { - /* - * We don't bother to fragment if the IP length is greater - * than the interface's MTU. Can this possibly matter? - */ - ip = mtod(copym, struct ip *); - HTONS(ip->ip_len); - HTONS(ip->ip_off); - ip->ip_sum = 0; - ip->ip_sum = in_cksum(copym, hlen); - /* - * NB: - * It's not clear whether there are any lingering - * reentrancy problems in other areas which might - * be exposed by using ip_input directly (in - * particular, everything which modifies the packet - * in-place). Yet another option is using the - * protosw directly to deliver the looped back - * packet. For the moment, we'll err on the side - * of safety by using if_simloop(). - */ -#if 1 /* XXX */ - if (dst->sin_family != AF_INET) { - printf("ip_mloopback: bad address family %d\n", - dst->sin_family); - dst->sin_family = AF_INET; - } -#endif + bzero(&ro, sizeof (ro)); + error = ip_output(m, NULL, &ro, 0, NULL, NULL); - /* - * Mark checksum as valid or calculate checksum for loopback. - * - * This is done this way because we have to embed the ifp of - * the interface we will send the original copy of the packet - * out on in the mbuf. ip_input will check if_hwassist of the - * embedded ifp and ignore all csum_flags if if_hwassist is 0. - * The UDP checksum has not been calculated yet. - */ - if (copym->m_pkthdr.csum_flags & CSUM_DELAY_DATA) { - if (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); - } - } + ROUTE_RELEASE(&ro); + return (error); +} - /* - * TedW: - * We need to send all loopback traffic down to dlil in case - * a filter has tapped-in. - */ +static int +sysctl_reset_ip_output_stats SYSCTL_HANDLER_ARGS +{ +#pragma unused(arg1, arg2) + int error, i; - /* - * 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); - } + i = ip_output_measure; + error = sysctl_handle_int(oidp, &i, 0, req); + if (error || req->newptr == USER_ADDR_NULL) + goto done; + /* impose bounds */ + if (i < 0 || i > 1) { + error = EINVAL; + goto done; + } + if (ip_output_measure != i && i == 1) { + net_perf_initialize(&net_perf, ip_output_measure_bins); + } + ip_output_measure = i; +done: + return (error); +} -/* if_simloop(ifp, copym, (struct sockaddr *)dst, 0);*/ +static int +sysctl_ip_output_measure_bins SYSCTL_HANDLER_ARGS +{ +#pragma unused(arg1, arg2) + int error; + uint64_t i; + + i = ip_output_measure_bins; + error = sysctl_handle_quad(oidp, &i, 0, req); + if (error || req->newptr == USER_ADDR_NULL) + goto done; + /* validate data */ + if (!net_perf_validate_bins(i)) { + error = EINVAL; + goto done; } + ip_output_measure_bins = i; +done: + return (error); } + +static int +sysctl_ip_output_getperf SYSCTL_HANDLER_ARGS +{ +#pragma unused(oidp, arg1, arg2) + if (req->oldptr == USER_ADDR_NULL) + req->oldlen = (size_t)sizeof (struct ipstat); + + return (SYSCTL_OUT(req, &net_perf, MIN(sizeof (net_perf), req->oldlen))); +} +