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4022 4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054 4055 4056 4057 4058 4059 4060 4061 4062 4063 4064 4065 4066 4067 4068 4069 4070 4071 4072 4073 4074 4075 4076 4077 4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101 4102 4103 4104 4105 4106 4107 4108 4109 4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121 4122 4123 4124 4125 4126 4127 4128 4129 4130 4131 4132 4133 4134 4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 | /* * Copyright (c) 2000-2017 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1988, 1990, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 */ /* * 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. */ #include <sys/param.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/errno.h> #include <sys/protosw.h> #include <sys/socket.h> #include <sys/socketvar.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/proc.h> #include <sys/kauth.h> #include <sys/mcache.h> #include <sys/sysctl.h> #include <kern/zalloc.h> #include <libkern/OSByteOrder.h> #include <pexpert/pexpert.h> #include <mach/sdt.h> #include <net/if.h> #include <net/route.h> #include <net/dlil.h> #include <net/net_api_stats.h> #include <net/net_osdep.h> #include <net/net_perf.h> #include <netinet/in.h> #include <netinet/in_var.h> #include <netinet/ip_var.h> #include <netinet6/in6_var.h> #include <netinet/ip6.h> #include <netinet/kpi_ipfilter_var.h> #include <netinet/in_tclass.h> #include <netinet6/ip6protosw.h> #include <netinet/icmp6.h> #include <netinet6/ip6_var.h> #include <netinet/in_pcb.h> #include <netinet6/nd6.h> #include <netinet6/scope6_var.h> #if IPSEC #include <netinet6/ipsec.h> #include <netinet6/ipsec6.h> #include <netkey/key.h> extern int ipsec_bypass; #endif /* IPSEC */ #if NECP #include <net/necp.h> #endif /* NECP */ #if CONFIG_MACF_NET #include <security/mac.h> #endif /* CONFIG_MACF_NET */ #if DUMMYNET #include <netinet/ip_fw.h> #include <netinet/ip_dummynet.h> #endif /* DUMMYNET */ #if PF #include <net/pfvar.h> #endif /* PF */ static int sysctl_reset_ip6_output_stats SYSCTL_HANDLER_ARGS; static int sysctl_ip6_output_measure_bins SYSCTL_HANDLER_ARGS; static int sysctl_ip6_output_getperf SYSCTL_HANDLER_ARGS; static int ip6_copyexthdr(struct mbuf **, caddr_t, int); static void ip6_out_cksum_stats(int, u_int32_t); static int ip6_insert_jumboopt(struct ip6_exthdrs *, u_int32_t); static int ip6_insertfraghdr(struct mbuf *, struct mbuf *, int, struct ip6_frag **); static int ip6_getpmtu(struct route_in6 *, struct route_in6 *, struct ifnet *, struct in6_addr *, u_int32_t *, boolean_t *); static int ip6_pcbopts(struct ip6_pktopts **, struct mbuf *, struct socket *, struct sockopt *sopt); static int ip6_pcbopt(int, u_char *, int, struct ip6_pktopts **, int); static int ip6_getpcbopt(struct ip6_pktopts *, int, struct sockopt *); static int copypktopts(struct ip6_pktopts *, struct ip6_pktopts *, int); static void im6o_trace(struct ip6_moptions *, int); static int ip6_setpktopt(int, u_char *, int, struct ip6_pktopts *, int, int, int); static int ip6_splithdr(struct mbuf *, struct ip6_exthdrs *); static void ip6_output_checksum(struct ifnet *, uint32_t, struct mbuf *, int, uint32_t, uint32_t); extern int udp_ctloutput(struct socket *, struct sockopt *); static int ip6_fragment_packet(struct mbuf **m, struct ip6_pktopts *opt, struct ip6_exthdrs *exthdrsp, struct ifnet *ifp, uint32_t mtu, boolean_t alwaysfrag, uint32_t unfragpartlen, struct route_in6 *ro_pmtu, int nxt0, uint32_t optlen); SYSCTL_DECL(_net_inet6_ip6); static int ip6_output_measure = 0; SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, output_perf, CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_output_measure, 0, sysctl_reset_ip6_output_stats, "I", "Do time measurement"); static uint64_t ip6_output_measure_bins = 0; SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, output_perf_bins, CTLTYPE_QUAD | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_output_measure_bins, 0, sysctl_ip6_output_measure_bins, "I", "bins for chaining performance data histogram"); static net_perf_t net_perf; SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, output_perf_data, CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0, sysctl_ip6_output_getperf, "S,net_perf", "IP6 output performance data (struct net_perf, net/net_perf.h)"); #define IM6O_TRACE_HIST_SIZE 32 /* size of trace history */ /* For gdb */ __private_extern__ unsigned int im6o_trace_hist_size = IM6O_TRACE_HIST_SIZE; struct ip6_moptions_dbg { struct ip6_moptions im6o; /* ip6_moptions */ u_int16_t im6o_refhold_cnt; /* # of IM6O_ADDREF */ u_int16_t im6o_refrele_cnt; /* # of IM6O_REMREF */ /* * Alloc and free callers. */ ctrace_t im6o_alloc; ctrace_t im6o_free; /* * Circular lists of IM6O_ADDREF and IM6O_REMREF callers. */ ctrace_t im6o_refhold[IM6O_TRACE_HIST_SIZE]; ctrace_t im6o_refrele[IM6O_TRACE_HIST_SIZE]; }; #if DEBUG static unsigned int im6o_debug = 1; /* debugging (enabled) */ #else static unsigned int im6o_debug; /* debugging (disabled) */ #endif /* !DEBUG */ static unsigned int im6o_size; /* size of zone element */ static struct zone *im6o_zone; /* zone for ip6_moptions */ #define IM6O_ZONE_MAX 64 /* maximum elements in zone */ #define IM6O_ZONE_NAME "ip6_moptions" /* zone name */ /* * ip6_output() calls ip6_output_list() to do the work */ int ip6_output(struct mbuf *m0, struct ip6_pktopts *opt, struct route_in6 *ro, int flags, struct ip6_moptions *im6o, struct ifnet **ifpp, struct ip6_out_args *ip6oa) { return ip6_output_list(m0, 0, opt, ro, flags, im6o, ifpp, ip6oa); } /* * IP6 output. Each packet in mbuf chain m contains a skeletal IP6 * header (with pri, len, nxt, hlim, src, dst). * This function may modify ver and hlim only. * The mbuf chain containing the packet will be freed. * The mbuf opt, if present, will not be freed. * * If ro is non-NULL and has valid ro->ro_rt, route lookup would be * skipped and ro->ro_rt would be used. Otherwise the result of route * lookup is stored in ro->ro_rt. * * type of "mtu": rt_rmx.rmx_mtu is u_int32_t, ifnet.ifr_mtu is int, and * nd_ifinfo.linkmtu is u_int32_t. so we use u_int32_t to hold largest one, * which is rt_rmx.rmx_mtu. */ int ip6_output_list(struct mbuf *m0, int packetchain, struct ip6_pktopts *opt, struct route_in6 *ro, int flags, struct ip6_moptions *im6o, struct ifnet **ifpp, struct ip6_out_args *ip6oa) { struct ip6_hdr *ip6; u_char *nexthdrp; struct ifnet *ifp = NULL, *origifp = NULL; /* refcnt'd */ struct ifnet **ifpp_save = ifpp; struct mbuf *m, *mprev; struct mbuf *sendchain = NULL, *sendchain_last = NULL; struct mbuf *inputchain = NULL; int nxt0 = 0; struct route_in6 *ro_pmtu = NULL; struct rtentry *rt = NULL; struct sockaddr_in6 *dst = NULL, src_sa, dst_sa; int error = 0; struct in6_ifaddr *ia = NULL, *src_ia = NULL; u_int32_t mtu = 0; boolean_t alwaysfrag = FALSE; u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; struct ip6_rthdr *rh; struct in6_addr finaldst; ipfilter_t inject_filter_ref; struct ipf_pktopts *ippo = NULL; struct flowadv *adv = NULL; uint32_t pktcnt = 0; uint32_t packets_processed = 0; struct timeval start_tv; #if DUMMYNET struct m_tag *tag; struct ip6_out_args saved_ip6oa; struct sockaddr_in6 dst_buf; #endif /* DUMMYNET */ #if IPSEC struct socket *so = NULL; struct secpolicy *sp = NULL; struct route_in6 *ipsec_saved_route = NULL; boolean_t needipsectun = FALSE; #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 */ struct { struct ipf_pktopts ipf_pktopts; struct ip6_exthdrs exthdrs; struct route_in6 ip6route; #if IPSEC struct ipsec_output_state ipsec_state; #endif /* IPSEC */ #if NECP struct route_in6 necp_route; #endif /* NECP */ #if DUMMYNET struct route_in6 saved_route; struct route_in6 saved_ro_pmtu; struct ip_fw_args args; #endif /* DUMMYNET */ } ip6obz; #define ipf_pktopts ip6obz.ipf_pktopts #define exthdrs ip6obz.exthdrs #define ip6route ip6obz.ip6route #define ipsec_state ip6obz.ipsec_state #define necp_route ip6obz.necp_route #define saved_route ip6obz.saved_route #define saved_ro_pmtu ip6obz.saved_ro_pmtu #define args ip6obz.args union { struct { boolean_t select_srcif : 1; boolean_t hdrsplit : 1; boolean_t route_selected : 1; boolean_t dontfrag : 1; #if IPSEC boolean_t needipsec : 1; boolean_t noipsec : 1; #endif /* IPSEC */ }; uint32_t raw; } ip6obf = { .raw = 0 }; if (ip6_output_measure) net_perf_start_time(&net_perf, &start_tv); VERIFY(m0->m_flags & M_PKTHDR); /* zero out {saved_route, saved_ro_pmtu, ip6route, exthdrs, args} */ bzero(&ip6obz, sizeof (ip6obz)); #if DUMMYNET if (SLIST_EMPTY(&m0->m_pkthdr.tags)) goto tags_done; /* Grab info from mtags prepended to the chain */ if ((tag = m_tag_locate(m0, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_DUMMYNET, NULL)) != NULL) { struct dn_pkt_tag *dn_tag; /* * ip6_output_list() cannot handle chains of packets reinjected * by dummynet. The same restriction applies to * ip_output_list(). */ VERIFY(0 == packetchain); dn_tag = (struct dn_pkt_tag *)(tag+1); args.fwa_pf_rule = dn_tag->dn_pf_rule; bcopy(&dn_tag->dn_dst6, &dst_buf, sizeof (dst_buf)); dst = &dst_buf; ifp = dn_tag->dn_ifp; if (ifp != NULL) ifnet_reference(ifp); flags = dn_tag->dn_flags; if (dn_tag->dn_flags & IPV6_OUTARGS) { saved_ip6oa = dn_tag->dn_ip6oa; ip6oa = &saved_ip6oa; } saved_route = dn_tag->dn_ro6; ro = &saved_route; saved_ro_pmtu = dn_tag->dn_ro6_pmtu; ro_pmtu = &saved_ro_pmtu; origifp = dn_tag->dn_origifp; if (origifp != NULL) ifnet_reference(origifp); mtu = dn_tag->dn_mtu; alwaysfrag = (dn_tag->dn_alwaysfrag != 0); unfragpartlen = dn_tag->dn_unfragpartlen; bcopy(&dn_tag->dn_exthdrs, &exthdrs, sizeof (exthdrs)); m_tag_delete(m0, tag); } tags_done: #endif /* DUMMYNET */ m = m0; #if IPSEC if (ipsec_bypass == 0) { so = ipsec_getsocket(m); if (so != NULL) { (void) ipsec_setsocket(m, NULL); } /* If packet is bound to an interface, check bound policies */ if ((flags & IPV6_OUTARGS) && (ip6oa->ip6oa_flags & IP6OAF_BOUND_IF) && ip6oa->ip6oa_boundif != IFSCOPE_NONE) { /* ip6obf.noipsec is a bitfield, use temp integer */ int noipsec = 0; if (ipsec6_getpolicybyinterface(m, IPSEC_DIR_OUTBOUND, flags, ip6oa, &noipsec, &sp) != 0) goto bad; ip6obf.noipsec = (noipsec != 0); } } #endif /* IPSEC */ ippo = &ipf_pktopts; if (flags & IPV6_OUTARGS) { /* * In the forwarding case, only the ifscope value is used, * as source interface selection doesn't take place. */ if ((ip6obf.select_srcif = (!(flags & (IPV6_FORWARDING | IPV6_UNSPECSRC | IPV6_FLAG_NOSRCIFSEL)) && (ip6oa->ip6oa_flags & IP6OAF_SELECT_SRCIF)))) ipf_pktopts.ippo_flags |= IPPOF_SELECT_SRCIF; if ((ip6oa->ip6oa_flags & IP6OAF_BOUND_IF) && ip6oa->ip6oa_boundif != IFSCOPE_NONE) { ipf_pktopts.ippo_flags |= (IPPOF_BOUND_IF | (ip6oa->ip6oa_boundif << IPPOF_SHIFT_IFSCOPE)); } if (ip6oa->ip6oa_flags & IP6OAF_BOUND_SRCADDR) ipf_pktopts.ippo_flags |= IPPOF_BOUND_SRCADDR; } else { ip6obf.select_srcif = FALSE; if (flags & IPV6_OUTARGS) { ip6oa->ip6oa_boundif = IFSCOPE_NONE; ip6oa->ip6oa_flags &= ~(IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_IF | IP6OAF_BOUND_SRCADDR); } } if (flags & IPV6_OUTARGS) { if (ip6oa->ip6oa_flags & IP6OAF_NO_CELLULAR) ipf_pktopts.ippo_flags |= IPPOF_NO_IFT_CELLULAR; if (ip6oa->ip6oa_flags & IP6OAF_NO_EXPENSIVE) ipf_pktopts.ippo_flags |= IPPOF_NO_IFF_EXPENSIVE; adv = &ip6oa->ip6oa_flowadv; adv->code = FADV_SUCCESS; ip6oa->ip6oa_retflags = 0; } /* * Clear out ifpp to be filled in after determining route. ifpp_save is * used to keep old value to release reference properly and dtrace * ipsec tunnel traffic properly. */ if (ifpp != NULL && *ifpp != NULL) *ifpp = NULL; #if DUMMYNET if (args.fwa_pf_rule) { ip6 = mtod(m, struct ip6_hdr *); VERIFY(ro != NULL); /* ro == saved_route */ goto check_with_pf; } #endif /* DUMMYNET */ #if NECP /* * Since all packets are assumed to come from same socket, necp lookup * only needs to happen once per function entry. */ necp_matched_policy_id = necp_ip6_output_find_policy_match(m, flags, (flags & IPV6_OUTARGS) ? ip6oa : NULL, &necp_result, &necp_result_parameter); #endif /* NECP */ /* * If a chain was passed in, prepare for ther first iteration. For all * other iterations, this work will be done at evaluateloop: label. */ if (packetchain) { /* * Remove m from the chain during processing to avoid * accidental frees on entire list. */ inputchain = m->m_nextpkt; m->m_nextpkt = NULL; } loopit: packets_processed++; m->m_pkthdr.pkt_flags &= ~(PKTF_LOOP|PKTF_IFAINFO); ip6 = mtod(m, struct ip6_hdr *); nxt0 = ip6->ip6_nxt; finaldst = ip6->ip6_dst; ip6obf.hdrsplit = FALSE; ro_pmtu = NULL; if (!SLIST_EMPTY(&m->m_pkthdr.tags)) inject_filter_ref = ipf_get_inject_filter(m); else inject_filter_ref = NULL; #define MAKE_EXTHDR(hp, mp) do { \ if (hp != NULL) { \ struct ip6_ext *eh = (struct ip6_ext *)(hp); \ error = ip6_copyexthdr((mp), (caddr_t)(hp), \ ((eh)->ip6e_len + 1) << 3); \ if (error) \ goto freehdrs; \ } \ } while (0) if (opt != NULL) { /* Hop-by-Hop options header */ MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); /* Destination options header(1st part) */ if (opt->ip6po_rthdr) { /* * Destination options header(1st part) * This only makes sense with a routing header. * See Section 9.2 of RFC 3542. * Disabling this part just for MIP6 convenience is * a bad idea. We need to think carefully about a * way to make the advanced API coexist with MIP6 * options, which might automatically be inserted in * the kernel. */ MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); } /* Routing header */ MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); /* Destination options header(2nd part) */ MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); } #undef MAKE_EXTHDR #if NECP if (necp_matched_policy_id) { necp_mark_packet_from_ip(m, necp_matched_policy_id); switch (necp_result) { case NECP_KERNEL_POLICY_RESULT_PASS: 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; ip6stat.ip6s_necp_policy_drop++; goto freehdrs; 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) { goto skip_ipsec; } else { if (necp_packet_can_rebind_to_ifnet(m, policy_ifp, (struct route *)&necp_route, AF_INET6)) { /* * Set scoped index to the tunnel * interface, since it is compatible * with the packet. This will only work * for callers who pass IPV6_OUTARGS, * but that covers all of the clients * we care about today. */ if (flags & IPV6_OUTARGS) { ip6oa->ip6oa_boundif = policy_ifp->if_index; ip6oa->ip6oa_flags |= IP6OAF_BOUND_IF; } if (opt != NULL && opt->ip6po_pktinfo != NULL) { opt->ip6po_pktinfo-> ipi6_ifindex = policy_ifp->if_index; } ro = &necp_route; goto skip_ipsec; } else { error = ENETUNREACH; ip6stat.ip6s_necp_policy_drop++; goto freehdrs; } } } default: break; } } #endif /* NECP */ #if IPSEC if (ipsec_bypass != 0 || ip6obf.noipsec) goto skip_ipsec; if (sp == NULL) { /* get a security policy for this packet */ if (so != NULL) { sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); } else { sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); } if (sp == NULL) { IPSEC_STAT_INCREMENT(ipsec6stat.out_inval); goto freehdrs; } } error = 0; /* check policy */ switch (sp->policy) { case IPSEC_POLICY_DISCARD: case IPSEC_POLICY_GENERATE: /* * This packet is just discarded. */ IPSEC_STAT_INCREMENT(ipsec6stat.out_polvio); goto freehdrs; case IPSEC_POLICY_BYPASS: case IPSEC_POLICY_NONE: /* no need to do IPsec. */ ip6obf.needipsec = FALSE; break; case IPSEC_POLICY_IPSEC: if (sp->req == NULL) { /* acquire a policy */ error = key_spdacquire(sp); goto freehdrs; } if (sp->ipsec_if) { goto skip_ipsec; } else { ip6obf.needipsec = TRUE; } break; case IPSEC_POLICY_ENTRUST: default: printf("%s: Invalid policy found: %d\n", __func__, sp->policy); break; } skip_ipsec: #endif /* IPSEC */ /* * Calculate the total length of the extension header chain. * Keep the length of the unfragmentable part for fragmentation. */ optlen = 0; if (exthdrs.ip6e_hbh != NULL) optlen += exthdrs.ip6e_hbh->m_len; if (exthdrs.ip6e_dest1 != NULL) optlen += exthdrs.ip6e_dest1->m_len; if (exthdrs.ip6e_rthdr != NULL) optlen += exthdrs.ip6e_rthdr->m_len; unfragpartlen = optlen + sizeof (struct ip6_hdr); /* NOTE: we don't add AH/ESP length here. do that later. */ if (exthdrs.ip6e_dest2 != NULL) optlen += exthdrs.ip6e_dest2->m_len; /* * If we need IPsec, or there is at least one extension header, * separate IP6 header from the payload. */ if (( #if IPSEC ip6obf.needipsec || #endif /* IPSEC */ optlen) && !ip6obf.hdrsplit) { if ((error = ip6_splithdr(m, &exthdrs)) != 0) { m = NULL; goto freehdrs; } m = exthdrs.ip6e_ip6; ip6obf.hdrsplit = TRUE; } /* adjust pointer */ ip6 = mtod(m, struct ip6_hdr *); /* adjust mbuf packet header length */ m->m_pkthdr.len += optlen; plen = m->m_pkthdr.len - sizeof (*ip6); /* If this is a jumbo payload, insert a jumbo payload option. */ if (plen > IPV6_MAXPACKET) { if (!ip6obf.hdrsplit) { if ((error = ip6_splithdr(m, &exthdrs)) != 0) { m = NULL; goto freehdrs; } m = exthdrs.ip6e_ip6; ip6obf.hdrsplit = TRUE; } /* adjust pointer */ ip6 = mtod(m, struct ip6_hdr *); if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) goto freehdrs; ip6->ip6_plen = 0; } else { ip6->ip6_plen = htons(plen); } /* * Concatenate headers and fill in next header fields. * Here we have, on "m" * IPv6 payload * and we insert headers accordingly. Finally, we should be getting: * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] * * during the header composing process, "m" points to IPv6 header. * "mprev" points to an extension header prior to esp. */ nexthdrp = &ip6->ip6_nxt; mprev = m; /* * we treat dest2 specially. this makes IPsec processing * much easier. the goal here is to make mprev point the * mbuf prior to dest2. * * result: IPv6 dest2 payload * m and mprev will point to IPv6 header. */ if (exthdrs.ip6e_dest2 != NULL) { if (!ip6obf.hdrsplit) { panic("assumption failed: hdr not split"); /* NOTREACHED */ } exthdrs.ip6e_dest2->m_next = m->m_next; m->m_next = exthdrs.ip6e_dest2; *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; ip6->ip6_nxt = IPPROTO_DSTOPTS; } #define MAKE_CHAIN(m, mp, p, i) do { \ if (m != NULL) { \ if (!ip6obf.hdrsplit) { \ panic("assumption failed: hdr not split"); \ /* NOTREACHED */ \ } \ *mtod((m), u_char *) = *(p); \ *(p) = (i); \ p = mtod((m), u_char *); \ (m)->m_next = (mp)->m_next; \ (mp)->m_next = (m); \ (mp) = (m); \ } \ } while (0) /* * result: IPv6 hbh dest1 rthdr dest2 payload * m will point to IPv6 header. mprev will point to the * extension header prior to dest2 (rthdr in the above case). */ MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); /* It is no longer safe to free the pointers in exthdrs. */ exthdrs.merged = TRUE; #undef MAKE_CHAIN #if IPSEC if (ip6obf.needipsec && (m->m_pkthdr.csum_flags & CSUM_DELAY_IPV6_DATA)) in6_delayed_cksum_offset(m, 0, optlen, nxt0); #endif /* IPSEC */ if (!TAILQ_EMPTY(&ipv6_filters) && !((flags & IPV6_OUTARGS) && (ip6oa->ip6oa_flags & IP6OAF_INTCOPROC_ALLOWED))) { struct ipfilter *filter; int seen = (inject_filter_ref == NULL); int fixscope = 0; if (im6o != NULL && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { ippo->ippo_flags |= IPPOF_MCAST_OPTS; IM6O_LOCK(im6o); ippo->ippo_mcast_ifnet = im6o->im6o_multicast_ifp; ippo->ippo_mcast_ttl = im6o->im6o_multicast_hlim; ippo->ippo_mcast_loop = im6o->im6o_multicast_loop; IM6O_UNLOCK(im6o); } /* Hack: embed the scope_id in the destination */ if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) && (ip6->ip6_dst.s6_addr16[1] == 0) && (ro != NULL)) { fixscope = 1; ip6->ip6_dst.s6_addr16[1] = htons(ro->ro_dst.sin6_scope_id); } ipf_ref(); TAILQ_FOREACH(filter, &ipv6_filters, ipf_link) { /* * Don't process packet twice if we've already seen it. */ if (seen == 0) { if ((struct ipfilter *)inject_filter_ref == filter) seen = 1; } else if (filter->ipf_filter.ipf_output != NULL) { errno_t result; result = filter->ipf_filter.ipf_output( filter->ipf_filter.cookie, (mbuf_t *)&m, ippo); if (result == EJUSTRETURN) { ipf_unref(); m = NULL; goto evaluateloop; } if (result != 0) { ipf_unref(); goto bad; } } } ipf_unref(); ip6 = mtod(m, struct ip6_hdr *); /* Hack: cleanup embedded scope_id if we put it there */ if (fixscope) ip6->ip6_dst.s6_addr16[1] = 0; } #if IPSEC if (ip6obf.needipsec) { int segleft_org; /* * pointers after IPsec headers are not valid any more. * other pointers need a great care too. * (IPsec routines should not mangle mbufs prior to AH/ESP) */ exthdrs.ip6e_dest2 = NULL; if (exthdrs.ip6e_rthdr != NULL) { rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); segleft_org = rh->ip6r_segleft; rh->ip6r_segleft = 0; } else { rh = NULL; segleft_org = 0; } ipsec_state.m = m; error = ipsec6_output_trans(&ipsec_state, nexthdrp, mprev, sp, flags, &needipsectun); m = ipsec_state.m; if (error) { /* mbuf is already reclaimed in ipsec6_output_trans. */ m = NULL; switch (error) { case EHOSTUNREACH: case ENETUNREACH: case EMSGSIZE: case ENOBUFS: case ENOMEM: break; default: printf("ip6_output (ipsec): error code %d\n", error); /* FALLTHRU */ case ENOENT: /* don't show these error codes to the user */ error = 0; break; } goto bad; } if (exthdrs.ip6e_rthdr != NULL) { /* ah6_output doesn't modify mbuf chain */ rh->ip6r_segleft = segleft_org; } } #endif /* IPSEC */ /* * If there is a routing header, replace the destination address field * with the first hop of the routing header. */ if (exthdrs.ip6e_rthdr != NULL) { struct ip6_rthdr0 *rh0; struct in6_addr *addr; struct sockaddr_in6 sa; rh = (struct ip6_rthdr *) (mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *)); switch (rh->ip6r_type) { case IPV6_RTHDR_TYPE_0: rh0 = (struct ip6_rthdr0 *)rh; addr = (struct in6_addr *)(void *)(rh0 + 1); /* * construct a sockaddr_in6 form of * the first hop. * * XXX: we may not have enough * information about its scope zone; * there is no standard API to pass * the information from the * application. */ bzero(&sa, sizeof (sa)); sa.sin6_family = AF_INET6; sa.sin6_len = sizeof (sa); sa.sin6_addr = addr[0]; if ((error = sa6_embedscope(&sa, ip6_use_defzone)) != 0) { goto bad; } ip6->ip6_dst = sa.sin6_addr; bcopy(&addr[1], &addr[0], sizeof (struct in6_addr) * (rh0->ip6r0_segleft - 1)); addr[rh0->ip6r0_segleft - 1] = finaldst; /* XXX */ in6_clearscope(addr + rh0->ip6r0_segleft - 1); break; default: /* is it possible? */ error = EINVAL; goto bad; } } /* Source address validation */ if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && !(flags & IPV6_UNSPECSRC)) { error = EOPNOTSUPP; ip6stat.ip6s_badscope++; goto bad; } if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { error = EOPNOTSUPP; ip6stat.ip6s_badscope++; goto bad; } ip6stat.ip6s_localout++; /* * Route packet. */ if (ro == NULL) { ro = &ip6route; bzero((caddr_t)ro, sizeof (*ro)); } ro_pmtu = ro; if (opt != NULL && opt->ip6po_rthdr) ro = &opt->ip6po_route; dst = SIN6(&ro->ro_dst); if (ro->ro_rt != NULL) RT_LOCK_ASSERT_NOTHELD(ro->ro_rt); /* * if specified, try to fill in the traffic class field. * do not override if a non-zero value is already set. * we check the diffserv field and the ecn field separately. */ if (opt != NULL && opt->ip6po_tclass >= 0) { int mask = 0; if ((ip6->ip6_flow & htonl(0xfc << 20)) == 0) mask |= 0xfc; if ((ip6->ip6_flow & htonl(0x03 << 20)) == 0) mask |= 0x03; if (mask != 0) { ip6->ip6_flow |= htonl((opt->ip6po_tclass & mask) << 20); } } /* fill in or override the hop limit field, if necessary. */ if (opt && opt->ip6po_hlim != -1) { ip6->ip6_hlim = opt->ip6po_hlim & 0xff; } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { if (im6o != NULL) { IM6O_LOCK(im6o); ip6->ip6_hlim = im6o->im6o_multicast_hlim; IM6O_UNLOCK(im6o); } else { ip6->ip6_hlim = ip6_defmcasthlim; } } /* * If there is a cached route, check that it is to the same * destination and is still up. If not, free it and try again. * 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->sin6_family != AF_INET6 || !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst)) ROUTE_RELEASE(ro); if (ro->ro_rt == NULL) { bzero(dst, sizeof (*dst)); dst->sin6_family = AF_INET6; dst->sin6_len = sizeof (struct sockaddr_in6); dst->sin6_addr = ip6->ip6_dst; } #if IPSEC if (ip6obf.needipsec && needipsectun) { #if CONFIG_DTRACE struct ifnet *trace_ifp = (ifpp_save != NULL) ? (*ifpp_save) : NULL; #endif /* CONFIG_DTRACE */ /* * All the extension headers will become inaccessible * (since they can be encrypted). * Don't panic, we need no more updates to extension headers * on inner IPv6 packet (since they are now encapsulated). * * IPv6 [ESP|AH] IPv6 [extension headers] payload */ bzero(&exthdrs, sizeof (exthdrs)); exthdrs.ip6e_ip6 = m; ipsec_state.m = m; route_copyout((struct route *)&ipsec_state.ro, (struct route *)ro, sizeof (struct route_in6)); ipsec_state.dst = SA(dst); /* So that we can see packets inside the tunnel */ DTRACE_IP6(send, struct mbuf *, m, struct inpcb *, NULL, struct ip6_hdr *, ip6, struct ifnet *, trace_ifp, struct ip *, NULL, struct ip6_hdr *, ip6); error = ipsec6_output_tunnel(&ipsec_state, sp, flags); /* tunneled in IPv4? packet is gone */ if (ipsec_state.tunneled == 4) { m = NULL; goto evaluateloop; } m = ipsec_state.m; ipsec_saved_route = ro; ro = (struct route_in6 *)&ipsec_state.ro; dst = SIN6(ipsec_state.dst); if (error) { /* mbuf is already reclaimed in ipsec6_output_tunnel. */ m = NULL; switch (error) { case EHOSTUNREACH: case ENETUNREACH: case EMSGSIZE: case ENOBUFS: case ENOMEM: break; default: printf("ip6_output (ipsec): error code %d\n", error); /* FALLTHRU */ case ENOENT: /* don't show these error codes to the user */ error = 0; break; } goto bad; } /* * The packet has been encapsulated so the ifscope * is no longer valid since it does not apply to the * outer address: ignore the ifscope. */ if (flags & IPV6_OUTARGS) { ip6oa->ip6oa_boundif = IFSCOPE_NONE; ip6oa->ip6oa_flags &= ~IP6OAF_BOUND_IF; } if (opt != NULL && opt->ip6po_pktinfo != NULL) { if (opt->ip6po_pktinfo->ipi6_ifindex != IFSCOPE_NONE) opt->ip6po_pktinfo->ipi6_ifindex = IFSCOPE_NONE; } exthdrs.ip6e_ip6 = m; } #endif /* IPSEC */ /* * ifp should only be filled in for dummy net packets which will jump * to check_with_pf label. */ if (ifp != NULL) { VERIFY(ip6obf.route_selected); } /* adjust pointer */ ip6 = mtod(m, struct ip6_hdr *); if (ip6obf.select_srcif) { bzero(&src_sa, sizeof (src_sa)); src_sa.sin6_family = AF_INET6; src_sa.sin6_len = sizeof (src_sa); src_sa.sin6_addr = ip6->ip6_src; } bzero(&dst_sa, sizeof (dst_sa)); dst_sa.sin6_family = AF_INET6; dst_sa.sin6_len = sizeof (dst_sa); dst_sa.sin6_addr = ip6->ip6_dst; /* * Only call in6_selectroute() on first iteration to avoid taking * multiple references on ifp and rt. * * in6_selectroute() might return an ifp with its reference held * even in the error case, so make sure to release its reference. * ip6oa may be NULL if IPV6_OUTARGS isn't set. */ if (!ip6obf.route_selected) { error = in6_selectroute( ip6obf.select_srcif ? &src_sa : NULL, &dst_sa, opt, im6o, &src_ia, ro, &ifp, &rt, 0, ip6oa); if (error != 0) { switch (error) { case EHOSTUNREACH: ip6stat.ip6s_noroute++; break; case EADDRNOTAVAIL: default: break; /* XXX statistics? */ } if (ifp != NULL) in6_ifstat_inc(ifp, ifs6_out_discard); /* ifp (if non-NULL) will be released at the end */ goto bad; } ip6obf.route_selected = TRUE; } if (rt == NULL) { /* * If in6_selectroute() does not return a route entry, * dst may not have been updated. */ *dst = dst_sa; /* XXX */ } #if NECP /* Catch-all to check if the interface is allowed */ if (!necp_packet_is_allowed_over_interface(m, ifp)) { error = EHOSTUNREACH; ip6stat.ip6s_necp_policy_drop++; goto bad; } #endif /* NECP */ /* * then rt (for unicast) and ifp must be non-NULL valid values. */ if (!(flags & IPV6_FORWARDING)) { in6_ifstat_inc_na(ifp, ifs6_out_request); } if (rt != NULL) { RT_LOCK(rt); if (ia == NULL) { ia = (struct in6_ifaddr *)(rt->rt_ifa); if (ia != NULL) IFA_ADDREF(&ia->ia_ifa); } rt->rt_use++; RT_UNLOCK(rt); } /* * The outgoing interface must be in the zone of source and * destination addresses (except local/loopback). We should * use ia_ifp to support the case of sending packets to an * address of our own. */ if (ia != NULL && ia->ia_ifp) { ifnet_reference(ia->ia_ifp); /* for origifp */ if (origifp != NULL) ifnet_release(origifp); origifp = ia->ia_ifp; } else { if (ifp != NULL) ifnet_reference(ifp); /* for origifp */ if (origifp != NULL) ifnet_release(origifp); origifp = ifp; } /* skip scope enforcements for local/loopback route */ if (rt == NULL || !(rt->rt_ifp->if_flags & IFF_LOOPBACK)) { struct in6_addr src0, dst0; u_int32_t zone; src0 = ip6->ip6_src; if (in6_setscope(&src0, origifp, &zone)) goto badscope; bzero(&src_sa, sizeof (src_sa)); src_sa.sin6_family = AF_INET6; src_sa.sin6_len = sizeof (src_sa); src_sa.sin6_addr = ip6->ip6_src; if ((sa6_recoverscope(&src_sa, TRUE) || zone != src_sa.sin6_scope_id)) goto badscope; dst0 = ip6->ip6_dst; if ((in6_setscope(&dst0, origifp, &zone))) goto badscope; /* re-initialize to be sure */ bzero(&dst_sa, sizeof (dst_sa)); dst_sa.sin6_family = AF_INET6; dst_sa.sin6_len = sizeof (dst_sa); dst_sa.sin6_addr = ip6->ip6_dst; if ((sa6_recoverscope(&dst_sa, TRUE) || zone != dst_sa.sin6_scope_id)) goto badscope; /* scope check is done. */ goto routefound; badscope: ip6stat.ip6s_badscope++; in6_ifstat_inc(origifp, ifs6_out_discard); if (error == 0) error = EHOSTUNREACH; /* XXX */ goto bad; } routefound: if (rt != NULL && !IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { if (opt != NULL && opt->ip6po_nextroute.ro_rt) { /* * The nexthop is explicitly specified by the * application. We assume the next hop is an IPv6 * address. */ dst = SIN6(opt->ip6po_nexthop); } else if ((rt->rt_flags & RTF_GATEWAY)) { dst = SIN6(rt->rt_gateway); } /* * For packets destined to local/loopback, record the * source the source interface (which owns the source * address), as well as the output interface. This is * needed to reconstruct the embedded zone for the * link-local address case in ip6_input(). */ if (ia != NULL && (ifp->if_flags & IFF_LOOPBACK)) { uint32_t srcidx; if (src_ia != NULL) srcidx = src_ia->ia_ifp->if_index; else if (ro->ro_srcia != NULL) srcidx = ro->ro_srcia->ifa_ifp->if_index; else srcidx = 0; ip6_setsrcifaddr_info(m, srcidx, NULL); ip6_setdstifaddr_info(m, 0, ia); } } if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ } else { struct in6_multi *in6m; m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; in6_ifstat_inc_na(ifp, ifs6_out_mcast); /* * Confirm that the outgoing interface supports multicast. */ if (!(ifp->if_flags & IFF_MULTICAST)) { ip6stat.ip6s_noroute++; in6_ifstat_inc(ifp, ifs6_out_discard); error = ENETUNREACH; goto bad; } in6_multihead_lock_shared(); IN6_LOOKUP_MULTI(&ip6->ip6_dst, ifp, in6m); in6_multihead_lock_done(); if (im6o != NULL) IM6O_LOCK(im6o); if (in6m != NULL && (im6o == NULL || im6o->im6o_multicast_loop)) { if (im6o != NULL) IM6O_UNLOCK(im6o); /* * If we belong to the destination multicast group * on the outgoing interface, and the caller did not * forbid loopback, loop back a copy. */ ip6_mloopback(NULL, ifp, m, dst, optlen, nxt0); } else if (im6o != NULL) IM6O_UNLOCK(im6o); if (in6m != NULL) IN6M_REMREF(in6m); /* * Multicasts with a hoplimit of zero may be looped back, * above, but must not be transmitted on a network. * Also, multicasts addressed to the loopback interface * are not sent -- the above call to ip6_mloopback() will * loop back a copy if this host actually belongs to the * destination group on the loopback interface. */ if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK) || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst)) { /* remove m from the packetchain and continue looping */ if (m != NULL) m_freem(m); m = NULL; goto evaluateloop; } } /* * Fill the outgoing inteface to tell the upper layer * to increment per-interface statistics. */ if (ifpp != NULL && *ifpp == NULL) { ifnet_reference(ifp); /* for caller */ *ifpp = ifp; } /* Determine path MTU. */ if ((error = ip6_getpmtu(ro_pmtu, ro, ifp, &finaldst, &mtu, &alwaysfrag)) != 0) goto bad; /* * The caller of this function may specify to use the minimum MTU * in some cases. * An advanced API option (IPV6_USE_MIN_MTU) can also override MTU * setting. The logic is a bit complicated; by default, unicast * packets will follow path MTU while multicast packets will be sent at * the minimum MTU. If IP6PO_MINMTU_ALL is specified, all packets * including unicast ones will be sent at the minimum MTU. Multicast * packets will always be sent at the minimum MTU unless * IP6PO_MINMTU_DISABLE is explicitly specified. * See RFC 3542 for more details. */ if (mtu > IPV6_MMTU) { if ((flags & IPV6_MINMTU)) { mtu = IPV6_MMTU; } else if (opt && opt->ip6po_minmtu == IP6PO_MINMTU_ALL) { mtu = IPV6_MMTU; } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && (opt == NULL || opt->ip6po_minmtu != IP6PO_MINMTU_DISABLE)) { mtu = IPV6_MMTU; } } /* * clear embedded scope identifiers if necessary. * in6_clearscope will touch the addresses only when necessary. */ in6_clearscope(&ip6->ip6_src); in6_clearscope(&ip6->ip6_dst); /* * If the outgoing packet contains a hop-by-hop options header, * it must be examined and processed even by the source node. * (RFC 2460, section 4.) */ if (exthdrs.ip6e_hbh != NULL) { struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); u_int32_t dummy; /* XXX unused */ uint32_t oplen = 0; /* for ip6_process_hopopts() */ #if DIAGNOSTIC if ((hbh->ip6h_len + 1) << 3 > exthdrs.ip6e_hbh->m_len) panic("ip6e_hbh is not continuous"); #endif /* * XXX: If we have to send an ICMPv6 error to the sender, * we need the M_LOOP flag since icmp6_error() expects * the IPv6 and the hop-by-hop options header are * continuous unless the flag is set. */ m->m_flags |= M_LOOP; m->m_pkthdr.rcvif = ifp; if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), ((hbh->ip6h_len + 1) << 3) - sizeof (struct ip6_hbh), &dummy, &oplen) < 0) { /* * m was already freed at this point. Set to NULL so it * is not re-freed at end of ip6_output_list. */ m = NULL; error = EINVAL; /* better error? */ goto bad; } m->m_flags &= ~M_LOOP; /* XXX */ m->m_pkthdr.rcvif = NULL; } #if DUMMYNET check_with_pf: #endif /* DUMMYNET */ #if PF if (PF_IS_ENABLED) { #if DUMMYNET /* * TODO: Need to save opt->ip6po_flags for reinjection * rdar://10434993 */ args.fwa_m = m; args.fwa_oif = ifp; args.fwa_oflags = flags; if (flags & IPV6_OUTARGS) args.fwa_ip6oa = ip6oa; args.fwa_ro6 = ro; args.fwa_dst6 = dst; args.fwa_ro6_pmtu = ro_pmtu; args.fwa_origifp = origifp; args.fwa_mtu = mtu; args.fwa_alwaysfrag = alwaysfrag; args.fwa_unfragpartlen = unfragpartlen; args.fwa_exthdrs = &exthdrs; /* Invoke outbound packet filter */ error = pf_af_hook(ifp, NULL, &m, AF_INET6, FALSE, &args); #else /* !DUMMYNET */ error = pf_af_hook(ifp, NULL, &m, AF_INET6, FALSE, NULL); #endif /* !DUMMYNET */ if (error != 0 || m == NULL) { if (m != NULL) { panic("%s: unexpected packet %p\n", __func__, m); /* NOTREACHED */ } /* m was already freed by callee and is now NULL. */ goto evaluateloop; } ip6 = mtod(m, struct ip6_hdr *); } #endif /* PF */ #ifdef IPSEC /* clean ipsec history before fragmentation */ ipsec_delaux(m); #endif /* IPSEC */ if (ip6oa != NULL) { u_int8_t dscp; dscp = (ntohl(ip6->ip6_flow) & IP6FLOW_DSCP_MASK) >> IP6FLOW_DSCP_SHIFT; error = set_packet_qos(m, ifp, ip6oa->ip6oa_flags & IP6OAF_QOSMARKING_ALLOWED ? TRUE : FALSE, ip6oa->ip6oa_sotc, ip6oa->ip6oa_netsvctype, &dscp); if (error == 0) { ip6->ip6_flow &= ~htonl(IP6FLOW_DSCP_MASK); ip6->ip6_flow |= htonl((u_int32_t)dscp << IP6FLOW_DSCP_SHIFT); } else { printf("%s if_dscp_for_mbuf() error %d\n", __func__, error); error = 0; } } /* * Determine whether fragmentation is necessary. If so, m is passed * back as a chain of packets and original mbuf is freed. Otherwise, m * is unchanged. */ error = ip6_fragment_packet(&m, opt, &exthdrs, ifp, mtu, alwaysfrag, unfragpartlen, ro_pmtu, nxt0, optlen); if (error) goto bad; /* * The evaluateloop label is where we decide whether to continue looping over * packets or call into nd code to send. */ evaluateloop: /* * m may be NULL when we jump to the evaluateloop label from PF or * other code that can drop packets. */ if (m != NULL) { /* * If we already have a chain to send, tack m onto the end. * Otherwise make m the start and end of the to-be-sent chain. */ if (sendchain != NULL) { sendchain_last->m_nextpkt = m; } else { sendchain = m; } /* Fragmentation may mean m is a chain. Find the last packet. */ while (m->m_nextpkt) m = m->m_nextpkt; sendchain_last = m; pktcnt++; } /* Fill in next m from inputchain as appropriate. */ m = inputchain; if (m != NULL) { /* Isolate m from rest of input chain. */ inputchain = m->m_nextpkt; m->m_nextpkt = NULL; /* * Clear exthdrs and ipsec_state so stale contents are not * reused. Note this also clears the exthdrs.merged flag. */ bzero(&exthdrs, sizeof(exthdrs)); bzero(&ipsec_state, sizeof(ipsec_state)); /* Continue looping. */ goto loopit; } /* * If we get here, there's no more mbufs in inputchain, so send the * sendchain if there is one. */ if (pktcnt > 0) { error = nd6_output_list(ifp, origifp, sendchain, dst, ro->ro_rt, adv); /* * Fall through to done label even in error case because * nd6_output_list frees packetchain in both success and * failure cases. */ } done: if (ifpp_save != NULL && *ifpp_save != NULL) { ifnet_release(*ifpp_save); *ifpp_save = NULL; } ROUTE_RELEASE(&ip6route); #if IPSEC ROUTE_RELEASE(&ipsec_state.ro); if (sp != NULL) key_freesp(sp, KEY_SADB_UNLOCKED); #endif /* IPSEC */ #if NECP ROUTE_RELEASE(&necp_route); #endif /* NECP */ #if DUMMYNET ROUTE_RELEASE(&saved_route); ROUTE_RELEASE(&saved_ro_pmtu); #endif /* DUMMYNET */ if (ia != NULL) IFA_REMREF(&ia->ia_ifa); if (src_ia != NULL) IFA_REMREF(&src_ia->ia_ifa); if (ifp != NULL) ifnet_release(ifp); if (origifp != NULL) ifnet_release(origifp); if (ip6_output_measure) { net_perf_measure_time(&net_perf, &start_tv, packets_processed); net_perf_histogram(&net_perf, packets_processed); } return (error); freehdrs: if (exthdrs.ip6e_hbh != NULL) { if (exthdrs.merged) panic("Double free of ip6e_hbh"); m_freem(exthdrs.ip6e_hbh); } if (exthdrs.ip6e_dest1 != NULL) { if (exthdrs.merged) panic("Double free of ip6e_dest1"); m_freem(exthdrs.ip6e_dest1); } if (exthdrs.ip6e_rthdr != NULL) { if (exthdrs.merged) panic("Double free of ip6e_rthdr"); m_freem(exthdrs.ip6e_rthdr); } if (exthdrs.ip6e_dest2 != NULL) { if (exthdrs.merged) panic("Double free of ip6e_dest2"); m_freem(exthdrs.ip6e_dest2); } /* FALLTHRU */ bad: if (inputchain != NULL) m_freem_list(inputchain); if (sendchain != NULL) m_freem_list(sendchain); if (m != NULL) m_freem(m); goto done; #undef ipf_pktopts #undef exthdrs #undef ip6route #undef ipsec_state #undef saved_route #undef saved_ro_pmtu #undef args } /* ip6_fragment_packet * * The fragmentation logic is rather complex: * 1: normal case (dontfrag == 0, alwaysfrag == 0) * 1-a: send as is if tlen <= path mtu * 1-b: fragment if tlen > path mtu * * 2: if user asks us not to fragment (dontfrag == 1) * 2-a: send as is if tlen <= interface mtu * 2-b: error if tlen > interface mtu * * 3: if we always need to attach fragment header (alwaysfrag == 1) * always fragment * * 4: if dontfrag == 1 && alwaysfrag == 1 * error, as we cannot handle this conflicting request */ static int ip6_fragment_packet(struct mbuf **mptr, struct ip6_pktopts *opt, struct ip6_exthdrs *exthdrsp, struct ifnet *ifp, uint32_t mtu, boolean_t alwaysfrag, uint32_t unfragpartlen, struct route_in6 *ro_pmtu, int nxt0, uint32_t optlen) { VERIFY(NULL != mptr); struct mbuf *m = *mptr; int error = 0; size_t tlen = m->m_pkthdr.len; boolean_t dontfrag = (opt != NULL && (opt->ip6po_flags & IP6PO_DONTFRAG)); if (m->m_pkthdr.pkt_flags & PKTF_FORWARDED) { dontfrag = TRUE; /* * Discard partial sum information if this packet originated * from another interface; the packet would already have the * final checksum and we shouldn't recompute it. */ if ((m->m_pkthdr.csum_flags & (CSUM_DATA_VALID|CSUM_PARTIAL)) == (CSUM_DATA_VALID|CSUM_PARTIAL)) { m->m_pkthdr.csum_flags &= ~CSUM_TX_FLAGS; m->m_pkthdr.csum_data = 0; } } if (dontfrag && alwaysfrag) { /* case 4 */ /* conflicting request - can't transmit */ return EMSGSIZE; } /* Access without acquiring nd_ifinfo lock for performance */ if (dontfrag && tlen > IN6_LINKMTU(ifp)) { /* case 2-b */ /* * Even if the DONTFRAG option is specified, we cannot send the * packet when the data length is larger than the MTU of the * outgoing interface. * Notify the error by sending IPV6_PATHMTU ancillary data as * well as returning an error code (the latter is not described * in the API spec.) */ u_int32_t mtu32; struct ip6ctlparam ip6cp; mtu32 = (u_int32_t)mtu; bzero(&ip6cp, sizeof (ip6cp)); ip6cp.ip6c_cmdarg = (void *)&mtu32; pfctlinput2(PRC_MSGSIZE, SA(&ro_pmtu->ro_dst), (void *)&ip6cp); return EMSGSIZE; } /* * transmit packet without fragmentation */ if (dontfrag || (!alwaysfrag && /* case 1-a and 2-a */ (tlen <= mtu || TSO_IPV6_OK(ifp, m) || (ifp->if_hwassist & CSUM_FRAGMENT_IPV6)))) { /* * mppn not updated in this case because no new chain is formed * and inserted */ ip6_output_checksum(ifp, mtu, m, nxt0, tlen, optlen); } else { /* * time to fragment - cases 1-b and 3 are handled inside * ip6_do_fragmentation(). * mppn is passed down to be updated to point at fragment chain. */ error = ip6_do_fragmentation(mptr, optlen, ifp, unfragpartlen, mtod(m, struct ip6_hdr *), exthdrsp, mtu, nxt0); } return error; } /* * ip6_do_fragmentation() is called by ip6_fragment_packet() after determining * the packet needs to be fragmented. on success, morig is freed and a chain * of fragments is linked into the packet chain where morig existed. Otherwise, * an errno is returned. */ int ip6_do_fragmentation(struct mbuf **mptr, uint32_t optlen, struct ifnet *ifp, uint32_t unfragpartlen, struct ip6_hdr *ip6, struct ip6_exthdrs *exthdrsp, uint32_t mtu, int nxt0) { VERIFY(NULL != mptr); int error = 0; struct mbuf *morig = *mptr; struct mbuf *first_mbufp = NULL; struct mbuf *last_mbufp = NULL; size_t tlen = morig->m_pkthdr.len; /* * try to fragment the packet. case 1-b and 3 */ if ((morig->m_pkthdr.csum_flags & CSUM_TSO_IPV6)) { /* TSO and fragment aren't compatible */ in6_ifstat_inc(ifp, ifs6_out_fragfail); return EMSGSIZE; } else if (mtu < IPV6_MMTU) { /* path MTU cannot be less than IPV6_MMTU */ in6_ifstat_inc(ifp, ifs6_out_fragfail); return EMSGSIZE; } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ in6_ifstat_inc(ifp, ifs6_out_fragfail); return EMSGSIZE; } else { size_t hlen, len, off; struct mbuf **mnext = NULL; struct ip6_frag *ip6f; u_int32_t id = htonl(ip6_randomid()); u_char nextproto; /* * Too large for the destination or interface; * fragment if possible. * Must be able to put at least 8 bytes per fragment. */ hlen = unfragpartlen; if (mtu > IPV6_MAXPACKET) mtu = IPV6_MAXPACKET; len = (mtu - hlen - sizeof (struct ip6_frag)) & ~7; if (len < 8) { in6_ifstat_inc(ifp, ifs6_out_fragfail); return EMSGSIZE; } /* * Change the next header field of the last header in the * unfragmentable part. */ if (exthdrsp->ip6e_rthdr != NULL) { nextproto = *mtod(exthdrsp->ip6e_rthdr, u_char *); *mtod(exthdrsp->ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; } else if (exthdrsp->ip6e_dest1 != NULL) { nextproto = *mtod(exthdrsp->ip6e_dest1, u_char *); *mtod(exthdrsp->ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; } else if (exthdrsp->ip6e_hbh != NULL) { nextproto = *mtod(exthdrsp->ip6e_hbh, u_char *); *mtod(exthdrsp->ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; } else { nextproto = ip6->ip6_nxt; ip6->ip6_nxt = IPPROTO_FRAGMENT; } if (morig->m_pkthdr.csum_flags & CSUM_DELAY_IPV6_DATA) in6_delayed_cksum_offset(morig, 0, optlen, nxt0); /* * Loop through length of segment after first fragment, * make new header and copy data of each part and link onto * chain. */ for (off = hlen; off < tlen; off += len) { struct ip6_hdr *new_mhip6; struct mbuf *new_m; struct mbuf *m_frgpart; MGETHDR(new_m, M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (new_m == NULL) { error = ENOBUFS; ip6stat.ip6s_odropped++; break; } new_m->m_pkthdr.rcvif = NULL; new_m->m_flags = morig->m_flags & M_COPYFLAGS; if (first_mbufp != NULL) { /* Every pass through loop but first */ *mnext = new_m; last_mbufp = new_m; } else { /* This is the first element of the fragment chain */ first_mbufp = new_m; last_mbufp = new_m; } mnext = &new_m->m_nextpkt; new_m->m_data += max_linkhdr; new_mhip6 = mtod(new_m, struct ip6_hdr *); *new_mhip6 = *ip6; new_m->m_len = sizeof (*new_mhip6); error = ip6_insertfraghdr(morig, new_m, hlen, &ip6f); if (error) { ip6stat.ip6s_odropped++; break; } ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); if (off + len >= tlen) len = tlen - off; else ip6f->ip6f_offlg |= IP6F_MORE_FRAG; new_mhip6->ip6_plen = htons((u_short)(len + hlen + sizeof (*ip6f) - sizeof (struct ip6_hdr))); if ((m_frgpart = m_copy(morig, off, len)) == NULL) { error = ENOBUFS; ip6stat.ip6s_odropped++; break; } m_cat(new_m, m_frgpart); new_m->m_pkthdr.len = len + hlen + sizeof (*ip6f); new_m->m_pkthdr.rcvif = NULL; M_COPY_CLASSIFIER(new_m, morig); M_COPY_PFTAG(new_m, morig); #ifdef notyet #if CONFIG_MACF_NET mac_create_fragment(morig, new_m); #endif /* CONFIG_MACF_NET */ #endif /* notyet */ ip6f->ip6f_reserved = 0; ip6f->ip6f_ident = id; ip6f->ip6f_nxt = nextproto; ip6stat.ip6s_ofragments++; in6_ifstat_inc(ifp, ifs6_out_fragcreat); } if (error) { /* free all the fragments created */ if (first_mbufp != NULL) { m_freem_list(first_mbufp); first_mbufp = NULL; } last_mbufp = NULL; } else { /* successful fragmenting */ m_freem(morig); *mptr = first_mbufp; last_mbufp->m_nextpkt = NULL; ip6stat.ip6s_fragmented++; in6_ifstat_inc(ifp, ifs6_out_fragok); } } return error; } static int ip6_copyexthdr(struct mbuf **mp, caddr_t hdr, int hlen) { struct mbuf *m; if (hlen > MCLBYTES) return (ENOBUFS); /* XXX */ MGET(m, M_DONTWAIT, MT_DATA); if (m == NULL) return (ENOBUFS); if (hlen > MLEN) { MCLGET(m, M_DONTWAIT); if (!(m->m_flags & M_EXT)) { m_free(m); return (ENOBUFS); } } m->m_len = hlen; if (hdr != NULL) bcopy(hdr, mtod(m, caddr_t), hlen); *mp = m; return (0); } static void ip6_out_cksum_stats(int proto, u_int32_t len) { switch (proto) { case IPPROTO_TCP: tcp_out6_cksum_stats(len); break; case IPPROTO_UDP: udp_out6_cksum_stats(len); break; default: /* keep only TCP or UDP stats for now */ break; } } /* * Process a delayed payload checksum calculation (outbound path.) * * hoff is the number of bytes beyond the mbuf data pointer which * points to the IPv6 header. optlen is the number of bytes, if any, * between the end of IPv6 header and the beginning of the ULP payload * header, which represents the extension headers. If optlen is less * than zero, this routine will bail when it detects extension headers. * * Returns a bitmask representing all the work done in software. */ uint32_t in6_finalize_cksum(struct mbuf *m, uint32_t hoff, int32_t optlen, int32_t nxt0, uint32_t csum_flags) { unsigned char buf[sizeof (struct ip6_hdr)] __attribute__((aligned(8))); struct ip6_hdr *ip6; uint32_t offset, mlen, hlen, olen, sw_csum; uint16_t csum, ulpoff, plen; uint8_t nxt; _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_IPV6_DATA) == 0) goto done; mlen = m->m_pkthdr.len; /* total mbuf len */ hlen = sizeof (*ip6); /* IPv6 header len */ /* sanity check (need at least IPv6 header) */ if (mlen < (hoff + hlen)) { panic("%s: mbuf %p pkt len (%u) < hoff+ip6_hdr " "(%u+%u)\n", __func__, m, mlen, hoff, hlen); /* NOTREACHED */ } /* * In case the IPv6 header is not contiguous, or not 32-bit * aligned, copy it to a local buffer. */ if ((hoff + hlen) > m->m_len || !IP6_HDR_ALIGNED_P(mtod(m, caddr_t) + hoff)) { m_copydata(m, hoff, hlen, (caddr_t)buf); ip6 = (struct ip6_hdr *)(void *)buf; } else { ip6 = (struct ip6_hdr *)(void *)(m->m_data + hoff); } nxt = ip6->ip6_nxt; plen = ntohs(ip6->ip6_plen); if (plen != (mlen - (hoff + hlen))) { plen = OSSwapInt16(plen); if (plen != (mlen - (hoff + hlen))) { /* Don't complain for jumbograms */ if (plen != 0 || nxt != IPPROTO_HOPOPTS) { printf("%s: mbuf 0x%llx proto %d IPv6 " "plen %d (%x) [swapped %d (%x)] doesn't " "match actual packet length; %d is used " "instead\n", __func__, (uint64_t)VM_KERNEL_ADDRPERM(m), nxt, ip6->ip6_plen, ip6->ip6_plen, plen, plen, (mlen - (hoff + hlen))); } plen = mlen - (hoff + hlen); } } if (optlen < 0) { /* next header isn't TCP/UDP and we don't know optlen, bail */ if (nxt != IPPROTO_TCP && nxt != IPPROTO_UDP) { sw_csum = 0; goto done; } olen = 0; } else { /* caller supplied the original transport number; use it */ if (nxt0 >= 0) nxt = nxt0; olen = optlen; } offset = hoff + hlen + olen; /* ULP header */ /* sanity check */ if (mlen < offset) { panic("%s: mbuf %p pkt len (%u) < hoff+ip6_hdr+ext_hdr " "(%u+%u+%u)\n", __func__, m, mlen, hoff, hlen, olen); /* NOTREACHED */ } /* * offset is added to the lower 16-bit value of csum_data, * which is expected to contain the ULP offset; therefore * CSUM_PARTIAL offset adjustment must be undone. */ if ((m->m_pkthdr.csum_flags & (CSUM_PARTIAL|CSUM_DATA_VALID)) == (CSUM_PARTIAL|CSUM_DATA_VALID)) { /* * Get back the original ULP offset (this will * undo the CSUM_PARTIAL logic in ip6_output.) */ m->m_pkthdr.csum_data = (m->m_pkthdr.csum_tx_stuff - m->m_pkthdr.csum_tx_start); } ulpoff = (m->m_pkthdr.csum_data & 0xffff); /* ULP csum offset */ 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, nxt, ulpoff, m->m_pkthdr.csum_flags); /* NOTREACHED */ } csum = inet6_cksum(m, 0, offset, plen - olen); /* Update stats */ ip6_out_cksum_stats(nxt, plen - olen); /* RFC1122 4.1.3.4 */ if (csum == 0 && (m->m_pkthdr.csum_flags & (CSUM_UDPIPV6|CSUM_ZERO_INVERT))) csum = 0xffff; /* Insert the checksum in the ULP csum field */ offset += ulpoff; if ((offset + sizeof (csum)) > m->m_len) { m_copyback(m, offset, sizeof (csum), &csum); } else if (IP6_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_IPV6_DATA | CSUM_DATA_VALID | CSUM_PARTIAL | CSUM_ZERO_INVERT); done: return (sw_csum); } /* * Insert jumbo payload option. */ static int ip6_insert_jumboopt(struct ip6_exthdrs *exthdrs, u_int32_t plen) { struct mbuf *mopt; u_char *optbuf; u_int32_t v; #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ /* * If there is no hop-by-hop options header, allocate new one. * If there is one but it doesn't have enough space to store the * jumbo payload option, allocate a cluster to store the whole options. * Otherwise, use it to store the options. */ if (exthdrs->ip6e_hbh == NULL) { MGET(mopt, M_DONTWAIT, MT_DATA); if (mopt == NULL) return (ENOBUFS); mopt->m_len = JUMBOOPTLEN; optbuf = mtod(mopt, u_char *); optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ exthdrs->ip6e_hbh = mopt; } else { struct ip6_hbh *hbh; mopt = exthdrs->ip6e_hbh; if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { /* * XXX assumption: * - exthdrs->ip6e_hbh is not referenced from places * other than exthdrs. * - exthdrs->ip6e_hbh is not an mbuf chain. */ u_int32_t oldoptlen = mopt->m_len; struct mbuf *n; /* * XXX: give up if the whole (new) hbh header does * not fit even in an mbuf cluster. */ if (oldoptlen + JUMBOOPTLEN > MCLBYTES) return (ENOBUFS); /* * As a consequence, we must always prepare a cluster * at this point. */ MGET(n, M_DONTWAIT, MT_DATA); if (n != NULL) { MCLGET(n, M_DONTWAIT); if (!(n->m_flags & M_EXT)) { m_freem(n); n = NULL; } } if (n == NULL) return (ENOBUFS); n->m_len = oldoptlen + JUMBOOPTLEN; bcopy(mtod(mopt, caddr_t), mtod(n, caddr_t), oldoptlen); optbuf = mtod(n, u_char *) + oldoptlen; m_freem(mopt); mopt = exthdrs->ip6e_hbh = n; } else { optbuf = mtod(mopt, u_char *) + mopt->m_len; mopt->m_len += JUMBOOPTLEN; } optbuf[0] = IP6OPT_PADN; optbuf[1] = 1; /* * Adjust the header length according to the pad and * the jumbo payload option. */ hbh = mtod(mopt, struct ip6_hbh *); hbh->ip6h_len += (JUMBOOPTLEN >> 3); } /* fill in the option. */ optbuf[2] = IP6OPT_JUMBO; optbuf[3] = 4; v = (u_int32_t)htonl(plen + JUMBOOPTLEN); bcopy(&v, &optbuf[4], sizeof (u_int32_t)); /* finally, adjust the packet header length */ exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; return (0); #undef JUMBOOPTLEN } /* * Insert fragment header and copy unfragmentable header portions. */ static int ip6_insertfraghdr(struct mbuf *m0, struct mbuf *m, int hlen, struct ip6_frag **frghdrp) { struct mbuf *n, *mlast; if (hlen > sizeof (struct ip6_hdr)) { n = m_copym(m0, sizeof (struct ip6_hdr), hlen - sizeof (struct ip6_hdr), M_DONTWAIT); if (n == NULL) return (ENOBUFS); m->m_next = n; } else n = m; /* Search for the last mbuf of unfragmentable part. */ for (mlast = n; mlast->m_next; mlast = mlast->m_next) ; if (!(mlast->m_flags & M_EXT) && M_TRAILINGSPACE(mlast) >= sizeof (struct ip6_frag)) { /* use the trailing space of the last mbuf for the frag hdr */ *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); mlast->m_len += sizeof (struct ip6_frag); m->m_pkthdr.len += sizeof (struct ip6_frag); } else { /* allocate a new mbuf for the fragment header */ struct mbuf *mfrg; MGET(mfrg, M_DONTWAIT, MT_DATA); if (mfrg == NULL) return (ENOBUFS); mfrg->m_len = sizeof (struct ip6_frag); *frghdrp = mtod(mfrg, struct ip6_frag *); mlast->m_next = mfrg; } return (0); } static int ip6_getpmtu(struct route_in6 *ro_pmtu, struct route_in6 *ro, struct ifnet *ifp, struct in6_addr *dst, u_int32_t *mtup, boolean_t *alwaysfragp) { u_int32_t mtu = 0; boolean_t alwaysfrag = FALSE; int error = 0; boolean_t is_local = FALSE; if (IN6_IS_SCOPE_LINKLOCAL(dst)) is_local = TRUE; if (ro_pmtu != ro) { /* The first hop and the final destination may differ. */ struct sockaddr_in6 *sa6_dst = SIN6(&ro_pmtu->ro_dst); if (ROUTE_UNUSABLE(ro_pmtu) || !IN6_ARE_ADDR_EQUAL(&sa6_dst->sin6_addr, dst)) ROUTE_RELEASE(ro_pmtu); if (ro_pmtu->ro_rt == NULL) { bzero(sa6_dst, sizeof (*sa6_dst)); sa6_dst->sin6_family = AF_INET6; sa6_dst->sin6_len = sizeof (struct sockaddr_in6); sa6_dst->sin6_addr = *dst; rtalloc_scoped((struct route *)ro_pmtu, ifp != NULL ? ifp->if_index : IFSCOPE_NONE); } } if (ro_pmtu->ro_rt != NULL) { u_int32_t ifmtu; if (ifp == NULL) ifp = ro_pmtu->ro_rt->rt_ifp; /* Access without acquiring nd_ifinfo lock for performance */ ifmtu = IN6_LINKMTU(ifp); /* * Access rmx_mtu without holding the route entry lock, * for performance; this isn't something that changes * often, so optimize. */ mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; if (mtu > ifmtu || mtu == 0) { /* * The MTU on the route is larger than the MTU on * the interface! This shouldn't happen, unless the * MTU of the interface has been changed after the * interface was brought up. Change the MTU in the * route to match the interface MTU (as long as the * field isn't locked). * * if MTU on the route is 0, we need to fix the MTU. * this case happens with path MTU discovery timeouts. */ mtu = ifmtu; if (!(ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU)) ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ } else if (mtu < IPV6_MMTU) { /* * RFC2460 section 5, last paragraph: * if we record ICMPv6 too big message with * mtu < IPV6_MMTU, transmit packets sized IPV6_MMTU * or smaller, with framgent header attached. * (fragment header is needed regardless from the * packet size, for translators to identify packets) */ alwaysfrag = TRUE; mtu = IPV6_MMTU; } } else { if (ifp) { /* Don't hold nd_ifinfo lock for performance */ mtu = IN6_LINKMTU(ifp); } else { error = EHOSTUNREACH; /* XXX */ } } *mtup = mtu; if ((alwaysfragp != NULL) && !is_local) *alwaysfragp = alwaysfrag; return (error); } /* * IP6 socket option processing. */ int ip6_ctloutput(struct socket *so, struct sockopt *sopt) { int optdatalen, uproto; void *optdata; int privileged; struct inpcb *in6p = sotoinpcb(so); int error = 0, optval = 0; int level, op = -1, optname = 0; int optlen = 0; struct proc *p; VERIFY(sopt != NULL); level = sopt->sopt_level; op = sopt->sopt_dir; optname = sopt->sopt_name; optlen = sopt->sopt_valsize; p = sopt->sopt_p; uproto = (int)SOCK_PROTO(so); privileged = (proc_suser(p) == 0); if (level == IPPROTO_IPV6) { boolean_t capture_exthdrstat_in = FALSE; switch (op) { case SOPT_SET: switch (optname) { case IPV6_2292PKTOPTIONS: { struct mbuf *m; error = soopt_getm(sopt, &m); if (error != 0) break; error = soopt_mcopyin(sopt, m); if (error != 0) break; error = ip6_pcbopts(&in6p->in6p_outputopts, m, so, sopt); m_freem(m); break; } /* * Use of some Hop-by-Hop options or some * Destination options, might require special * privilege. That is, normal applications * (without special privilege) might be forbidden * from setting certain options in outgoing packets, * and might never see certain options in received * packets. [RFC 2292 Section 6] * KAME specific note: * KAME prevents non-privileged users from sending or * receiving ANY hbh/dst options in order to avoid * overhead of parsing options in the kernel. */ case IPV6_RECVHOPOPTS: case IPV6_RECVDSTOPTS: case IPV6_RECVRTHDRDSTOPTS: if (!privileged) break; /* FALLTHROUGH */ case IPV6_UNICAST_HOPS: case IPV6_HOPLIMIT: case IPV6_RECVPKTINFO: case IPV6_RECVHOPLIMIT: case IPV6_RECVRTHDR: case IPV6_RECVPATHMTU: case IPV6_RECVTCLASS: case IPV6_V6ONLY: case IPV6_AUTOFLOWLABEL: if (optlen != sizeof (int)) { error = EINVAL; break; } error = sooptcopyin(sopt, &optval, sizeof (optval), sizeof (optval)); if (error) break; switch (optname) { case IPV6_UNICAST_HOPS: if (optval < -1 || optval >= 256) { error = EINVAL; } else { /* -1 = kernel default */ in6p->in6p_hops = optval; if (in6p->inp_vflag & INP_IPV4) { in6p->inp_ip_ttl = optval; } } break; #define OPTSET(bit) do { \ if (optval) \ in6p->inp_flags |= (bit); \ else \ in6p->inp_flags &= ~(bit); \ } while (0) #define OPTSET2292(bit) do { \ in6p->inp_flags |= IN6P_RFC2292; \ if (optval) \ in6p->inp_flags |= (bit); \ else \ in6p->inp_flags &= ~(bit); \ } while (0) #define OPTBIT(bit) (in6p->inp_flags & (bit) ? 1 : 0) case IPV6_RECVPKTINFO: /* cannot mix with RFC2292 */ if (OPTBIT(IN6P_RFC2292)) { error = EINVAL; break; } OPTSET(IN6P_PKTINFO); break; case IPV6_HOPLIMIT: { struct ip6_pktopts **optp; /* cannot mix with RFC2292 */ if (OPTBIT(IN6P_RFC2292)) { error = EINVAL; break; } optp = &in6p->in6p_outputopts; error = ip6_pcbopt(IPV6_HOPLIMIT, (u_char *)&optval, sizeof (optval), optp, uproto); break; } case IPV6_RECVHOPLIMIT: /* cannot mix with RFC2292 */ if (OPTBIT(IN6P_RFC2292)) { error = EINVAL; break; } OPTSET(IN6P_HOPLIMIT); break; case IPV6_RECVHOPOPTS: /* cannot mix with RFC2292 */ if (OPTBIT(IN6P_RFC2292)) { error = EINVAL; break; } OPTSET(IN6P_HOPOPTS); capture_exthdrstat_in = TRUE; break; case IPV6_RECVDSTOPTS: /* cannot mix with RFC2292 */ if (OPTBIT(IN6P_RFC2292)) { error = EINVAL; break; } OPTSET(IN6P_DSTOPTS); capture_exthdrstat_in = TRUE; break; case IPV6_RECVRTHDRDSTOPTS: /* cannot mix with RFC2292 */ if (OPTBIT(IN6P_RFC2292)) { error = EINVAL; break; } OPTSET(IN6P_RTHDRDSTOPTS); capture_exthdrstat_in = TRUE; break; case IPV6_RECVRTHDR: /* cannot mix with RFC2292 */ if (OPTBIT(IN6P_RFC2292)) { error = EINVAL; break; } OPTSET(IN6P_RTHDR); capture_exthdrstat_in = TRUE; break; case IPV6_RECVPATHMTU: /* * We ignore this option for TCP * sockets. * (RFC3542 leaves this case * unspecified.) */ if (uproto != IPPROTO_TCP) OPTSET(IN6P_MTU); break; case IPV6_V6ONLY: /* * make setsockopt(IPV6_V6ONLY) * available only prior to bind(2). * see ipng mailing list, Jun 22 2001. */ if (in6p->inp_lport || !IN6_IS_ADDR_UNSPECIFIED( &in6p->in6p_laddr)) { error = EINVAL; break; } OPTSET(IN6P_IPV6_V6ONLY); if (optval) in6p->inp_vflag &= ~INP_IPV4; else in6p->inp_vflag |= INP_IPV4; break; case IPV6_RECVTCLASS: /* we can mix with RFC2292 */ OPTSET(IN6P_TCLASS); break; case IPV6_AUTOFLOWLABEL: OPTSET(IN6P_AUTOFLOWLABEL); break; } break; case IPV6_TCLASS: case IPV6_DONTFRAG: case IPV6_USE_MIN_MTU: case IPV6_PREFER_TEMPADDR: { struct ip6_pktopts **optp; if (optlen != sizeof (optval)) { error = EINVAL; break; } error = sooptcopyin(sopt, &optval, sizeof (optval), sizeof (optval)); if (error) break; optp = &in6p->in6p_outputopts; error = ip6_pcbopt(optname, (u_char *)&optval, sizeof (optval), optp, uproto); break; } case IPV6_2292PKTINFO: case IPV6_2292HOPLIMIT: case IPV6_2292HOPOPTS: case IPV6_2292DSTOPTS: case IPV6_2292RTHDR: /* RFC 2292 */ if (optlen != sizeof (int)) { error = EINVAL; break; } error = sooptcopyin(sopt, &optval, sizeof (optval), sizeof (optval)); if (error) break; switch (optname) { case IPV6_2292PKTINFO: OPTSET2292(IN6P_PKTINFO); break; case IPV6_2292HOPLIMIT: OPTSET2292(IN6P_HOPLIMIT); break; case IPV6_2292HOPOPTS: /* * Check super-user privilege. * See comments for IPV6_RECVHOPOPTS. */ if (!privileged) return (EPERM); OPTSET2292(IN6P_HOPOPTS); capture_exthdrstat_in = TRUE; break; case IPV6_2292DSTOPTS: if (!privileged) return (EPERM); OPTSET2292(IN6P_DSTOPTS| IN6P_RTHDRDSTOPTS); /* XXX */ capture_exthdrstat_in = TRUE; break; case IPV6_2292RTHDR: OPTSET2292(IN6P_RTHDR); capture_exthdrstat_in = TRUE; break; } break; case IPV6_3542PKTINFO: case IPV6_3542HOPOPTS: case IPV6_3542RTHDR: case IPV6_3542DSTOPTS: case IPV6_RTHDRDSTOPTS: case IPV6_3542NEXTHOP: { struct ip6_pktopts **optp; /* new advanced API (RFC3542) */ struct mbuf *m; /* cannot mix with RFC2292 */ if (OPTBIT(IN6P_RFC2292)) { error = EINVAL; break; } error = soopt_getm(sopt, &m); if (error != 0) break; error = soopt_mcopyin(sopt, m); if (error != 0) break; optp = &in6p->in6p_outputopts; error = ip6_pcbopt(optname, mtod(m, u_char *), m->m_len, optp, uproto); m_freem(m); break; } #undef OPTSET case IPV6_MULTICAST_IF: case IPV6_MULTICAST_HOPS: case IPV6_MULTICAST_LOOP: case IPV6_JOIN_GROUP: case IPV6_LEAVE_GROUP: case IPV6_MSFILTER: case MCAST_BLOCK_SOURCE: case MCAST_UNBLOCK_SOURCE: case MCAST_JOIN_GROUP: case MCAST_LEAVE_GROUP: case MCAST_JOIN_SOURCE_GROUP: case MCAST_LEAVE_SOURCE_GROUP: error = ip6_setmoptions(in6p, sopt); break; case IPV6_PORTRANGE: error = sooptcopyin(sopt, &optval, sizeof (optval), sizeof (optval)); if (error) break; switch (optval) { case IPV6_PORTRANGE_DEFAULT: in6p->inp_flags &= ~(INP_LOWPORT); in6p->inp_flags &= ~(INP_HIGHPORT); break; case IPV6_PORTRANGE_HIGH: in6p->inp_flags &= ~(INP_LOWPORT); in6p->inp_flags |= INP_HIGHPORT; break; case IPV6_PORTRANGE_LOW: in6p->inp_flags &= ~(INP_HIGHPORT); in6p->inp_flags |= INP_LOWPORT; break; default: error = EINVAL; break; } break; #if IPSEC case IPV6_IPSEC_POLICY: { caddr_t req = NULL; size_t len = 0; struct mbuf *m; if ((error = soopt_getm(sopt, &m)) != 0) break; if ((error = soopt_mcopyin(sopt, m)) != 0) break; req = mtod(m, caddr_t); len = m->m_len; error = ipsec6_set_policy(in6p, optname, req, len, privileged); m_freem(m); break; } #endif /* IPSEC */ /* * IPv6 variant of IP_BOUND_IF; for details see * comments on IP_BOUND_IF in ip_ctloutput(). */ case IPV6_BOUND_IF: /* This option is settable only on IPv6 */ if (!(in6p->inp_vflag & INP_IPV6)) { error = EINVAL; break; } error = sooptcopyin(sopt, &optval, sizeof (optval), sizeof (optval)); if (error) break; error = inp_bindif(in6p, optval, NULL); break; case IPV6_NO_IFT_CELLULAR: /* This option is settable only for IPv6 */ if (!(in6p->inp_vflag & INP_IPV6)) { 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(in6p)) { error = EINVAL; break; } error = so_set_restrictions(so, SO_RESTRICT_DENY_CELLULAR); break; case IPV6_OUT_IF: /* This option is not settable */ error = EINVAL; break; default: error = ENOPROTOOPT; break; } if (capture_exthdrstat_in) { if (uproto == IPPROTO_TCP) { INC_ATOMIC_INT64_LIM(net_api_stats.nas_sock_inet6_stream_exthdr_in); } else if (uproto == IPPROTO_UDP) { INC_ATOMIC_INT64_LIM(net_api_stats.nas_sock_inet6_dgram_exthdr_in); } } break; case SOPT_GET: switch (optname) { case IPV6_2292PKTOPTIONS: /* * RFC3542 (effectively) deprecated the * semantics of the 2292-style pktoptions. * Since it was not reliable in nature (i.e., * applications had to expect the lack of some * information after all), it would make sense * to simplify this part by always returning * empty data. */ sopt->sopt_valsize = 0; break; case IPV6_RECVHOPOPTS: case IPV6_RECVDSTOPTS: case IPV6_RECVRTHDRDSTOPTS: case IPV6_UNICAST_HOPS: case IPV6_RECVPKTINFO: case IPV6_RECVHOPLIMIT: case IPV6_RECVRTHDR: case IPV6_RECVPATHMTU: case IPV6_V6ONLY: case IPV6_PORTRANGE: case IPV6_RECVTCLASS: case IPV6_AUTOFLOWLABEL: switch (optname) { case IPV6_RECVHOPOPTS: optval = OPTBIT(IN6P_HOPOPTS); break; case IPV6_RECVDSTOPTS: optval = OPTBIT(IN6P_DSTOPTS); break; case IPV6_RECVRTHDRDSTOPTS: optval = OPTBIT(IN6P_RTHDRDSTOPTS); break; case IPV6_UNICAST_HOPS: optval = in6p->in6p_hops; break; case IPV6_RECVPKTINFO: optval = OPTBIT(IN6P_PKTINFO); break; case IPV6_RECVHOPLIMIT: optval = OPTBIT(IN6P_HOPLIMIT); break; case IPV6_RECVRTHDR: optval = OPTBIT(IN6P_RTHDR); break; case IPV6_RECVPATHMTU: optval = OPTBIT(IN6P_MTU); break; case IPV6_V6ONLY: optval = OPTBIT(IN6P_IPV6_V6ONLY); break; case IPV6_PORTRANGE: { int flags; flags = in6p->inp_flags; if (flags & INP_HIGHPORT) optval = IPV6_PORTRANGE_HIGH; else if (flags & INP_LOWPORT) optval = IPV6_PORTRANGE_LOW; else optval = 0; break; } case IPV6_RECVTCLASS: optval = OPTBIT(IN6P_TCLASS); break; case IPV6_AUTOFLOWLABEL: optval = OPTBIT(IN6P_AUTOFLOWLABEL); break; } if (error) break; error = sooptcopyout(sopt, &optval, sizeof (optval)); break; case IPV6_PATHMTU: { u_int32_t pmtu = 0; struct ip6_mtuinfo mtuinfo; struct route_in6 sro; bzero(&sro, sizeof (sro)); if (!(so->so_state & SS_ISCONNECTED)) return (ENOTCONN); /* * XXX: we dot not consider the case of source * routing, or optional information to specify * the outgoing interface. */ error = ip6_getpmtu(&sro, NULL, NULL, &in6p->in6p_faddr, &pmtu, NULL); ROUTE_RELEASE(&sro); if (error) break; if (pmtu > IPV6_MAXPACKET) pmtu = IPV6_MAXPACKET; bzero(&mtuinfo, sizeof (mtuinfo)); mtuinfo.ip6m_mtu = (u_int32_t)pmtu; optdata = (void *)&mtuinfo; optdatalen = sizeof (mtuinfo); error = sooptcopyout(sopt, optdata, optdatalen); break; } case IPV6_2292PKTINFO: case IPV6_2292HOPLIMIT: case IPV6_2292HOPOPTS: case IPV6_2292RTHDR: case IPV6_2292DSTOPTS: switch (optname) { case IPV6_2292PKTINFO: optval = OPTBIT(IN6P_PKTINFO); break; case IPV6_2292HOPLIMIT: optval = OPTBIT(IN6P_HOPLIMIT); break; case IPV6_2292HOPOPTS: optval = OPTBIT(IN6P_HOPOPTS); break; case IPV6_2292RTHDR: optval = OPTBIT(IN6P_RTHDR); break; case IPV6_2292DSTOPTS: optval = OPTBIT(IN6P_DSTOPTS| IN6P_RTHDRDSTOPTS); break; } error = sooptcopyout(sopt, &optval, sizeof (optval)); break; case IPV6_PKTINFO: case IPV6_HOPOPTS: case IPV6_RTHDR: case IPV6_DSTOPTS: case IPV6_RTHDRDSTOPTS: case IPV6_NEXTHOP: case IPV6_TCLASS: case IPV6_DONTFRAG: case IPV6_USE_MIN_MTU: case IPV6_PREFER_TEMPADDR: error = ip6_getpcbopt(in6p->in6p_outputopts, optname, sopt); break; case IPV6_MULTICAST_IF: case IPV6_MULTICAST_HOPS: case IPV6_MULTICAST_LOOP: case IPV6_MSFILTER: error = ip6_getmoptions(in6p, sopt); break; #if IPSEC case IPV6_IPSEC_POLICY: { error = 0; /* This option is no longer supported */ break; } #endif /* IPSEC */ case IPV6_BOUND_IF: if (in6p->inp_flags & INP_BOUND_IF) optval = in6p->inp_boundifp->if_index; error = sooptcopyout(sopt, &optval, sizeof (optval)); break; case IPV6_NO_IFT_CELLULAR: optval = INP_NO_CELLULAR(in6p) ? 1 : 0; error = sooptcopyout(sopt, &optval, sizeof (optval)); break; case IPV6_OUT_IF: optval = (in6p->in6p_last_outifp != NULL) ? in6p->in6p_last_outifp->if_index : 0; error = sooptcopyout(sopt, &optval, sizeof (optval)); break; default: error = ENOPROTOOPT; break; } break; } } else if (level == IPPROTO_UDP) { error = udp_ctloutput(so, sopt); } else { error = EINVAL; } return (error); } int ip6_raw_ctloutput(struct socket *so, struct sockopt *sopt) { int error = 0, optval, optlen; const int icmp6off = offsetof(struct icmp6_hdr, icmp6_cksum); struct inpcb *in6p = sotoinpcb(so); int level, op, optname; level = sopt->sopt_level; op = sopt->sopt_dir; optname = sopt->sopt_name; optlen = sopt->sopt_valsize; if (level != IPPROTO_IPV6) return (EINVAL); switch (optname) { case IPV6_CHECKSUM: /* * For ICMPv6 sockets, no modification allowed for checksum * offset, permit "no change" values to help existing apps. * * RFC3542 says: "An attempt to set IPV6_CHECKSUM * for an ICMPv6 socket will fail." * The current behavior does not meet RFC3542. */ switch (op) { case SOPT_SET: if (optlen != sizeof (int)) { error = EINVAL; break; } error = sooptcopyin(sopt, &optval, sizeof (optval), sizeof (optval)); if (error) break; if ((optval % 2) != 0) { /* the API assumes even offset values */ error = EINVAL; } else if (SOCK_PROTO(so) == IPPROTO_ICMPV6) { if (optval != icmp6off) error = EINVAL; } else { in6p->in6p_cksum = optval; } break; case SOPT_GET: if (SOCK_PROTO(so) == IPPROTO_ICMPV6) optval = icmp6off; else optval = in6p->in6p_cksum; error = sooptcopyout(sopt, &optval, sizeof (optval)); break; default: error = EINVAL; break; } break; default: error = ENOPROTOOPT; break; } return (error); } /* * Set up IP6 options in pcb for insertion in output packets or * specifying behavior of outgoing packets. */ static int ip6_pcbopts(struct ip6_pktopts **pktopt, struct mbuf *m, struct socket *so, struct sockopt *sopt) { #pragma unused(sopt) struct ip6_pktopts *opt = *pktopt; int error = 0; /* turn off any old options. */ if (opt != NULL) { #if DIAGNOSTIC if (opt->ip6po_pktinfo || opt->ip6po_nexthop || opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || opt->ip6po_rhinfo.ip6po_rhi_rthdr) printf("%s: all specified options are cleared.\n", __func__); #endif ip6_clearpktopts(opt, -1); } else { opt = _MALLOC(sizeof (*opt), M_IP6OPT, M_WAITOK); if (opt == NULL) return (ENOBUFS); } *pktopt = NULL; if (m == NULL || m->m_len == 0) { /* * Only turning off any previous options, regardless of * whether the opt is just created or given. */ if (opt != NULL) FREE(opt, M_IP6OPT); return (0); } /* set options specified by user. */ if ((error = ip6_setpktopts(m, opt, NULL, SOCK_PROTO(so))) != 0) { ip6_clearpktopts(opt, -1); /* XXX: discard all options */ FREE(opt, M_IP6OPT); return (error); } *pktopt = opt; return (0); } /* * initialize ip6_pktopts. beware that there are non-zero default values in * the struct. */ void ip6_initpktopts(struct ip6_pktopts *opt) { bzero(opt, sizeof (*opt)); opt->ip6po_hlim = -1; /* -1 means default hop limit */ opt->ip6po_tclass = -1; /* -1 means default traffic class */ opt->ip6po_minmtu = IP6PO_MINMTU_MCASTONLY; opt->ip6po_prefer_tempaddr = IP6PO_TEMPADDR_SYSTEM; } static int ip6_pcbopt(int optname, u_char *buf, int len, struct ip6_pktopts **pktopt, int uproto) { struct ip6_pktopts *opt; opt = *pktopt; if (opt == NULL) { opt = _MALLOC(sizeof (*opt), M_IP6OPT, M_WAITOK); if (opt == NULL) return (ENOBUFS); ip6_initpktopts(opt); *pktopt = opt; } return (ip6_setpktopt(optname, buf, len, opt, 1, 0, uproto)); } static int ip6_getpcbopt(struct ip6_pktopts *pktopt, int optname, struct sockopt *sopt) { void *optdata = NULL; int optdatalen = 0; struct ip6_ext *ip6e; struct in6_pktinfo null_pktinfo; int deftclass = 0, on; int defminmtu = IP6PO_MINMTU_MCASTONLY; int defpreftemp = IP6PO_TEMPADDR_SYSTEM; switch (optname) { case IPV6_PKTINFO: if (pktopt && pktopt->ip6po_pktinfo) optdata = (void *)pktopt->ip6po_pktinfo; else { /* XXX: we don't have to do this every time... */ bzero(&null_pktinfo, sizeof (null_pktinfo)); optdata = (void *)&null_pktinfo; } optdatalen = sizeof (struct in6_pktinfo); break; case IPV6_TCLASS: if (pktopt && pktopt->ip6po_tclass >= 0) optdata = (void *)&pktopt->ip6po_tclass; else optdata = (void *)&deftclass; optdatalen = sizeof (int); break; case IPV6_HOPOPTS: if (pktopt && pktopt->ip6po_hbh) { optdata = (void *)pktopt->ip6po_hbh; ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; optdatalen = (ip6e->ip6e_len + 1) << 3; } break; case IPV6_RTHDR: if (pktopt && pktopt->ip6po_rthdr) { optdata = (void *)pktopt->ip6po_rthdr; ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; optdatalen = (ip6e->ip6e_len + 1) << 3; } break; case IPV6_RTHDRDSTOPTS: if (pktopt && pktopt->ip6po_dest1) { optdata = (void *)pktopt->ip6po_dest1; ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; optdatalen = (ip6e->ip6e_len + 1) << 3; } break; case IPV6_DSTOPTS: if (pktopt && pktopt->ip6po_dest2) { optdata = (void *)pktopt->ip6po_dest2; ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; optdatalen = (ip6e->ip6e_len + 1) << 3; } break; case IPV6_NEXTHOP: if (pktopt && pktopt->ip6po_nexthop) { optdata = (void *)pktopt->ip6po_nexthop; optdatalen = pktopt->ip6po_nexthop->sa_len; } break; case IPV6_USE_MIN_MTU: if (pktopt) optdata = (void *)&pktopt->ip6po_minmtu; else optdata = (void *)&defminmtu; optdatalen = sizeof (int); break; case IPV6_DONTFRAG: if (pktopt && ((pktopt->ip6po_flags) & IP6PO_DONTFRAG)) on = 1; else on = 0; optdata = (void *)&on; optdatalen = sizeof (on); break; case IPV6_PREFER_TEMPADDR: if (pktopt) optdata = (void *)&pktopt->ip6po_prefer_tempaddr; else optdata = (void *)&defpreftemp; optdatalen = sizeof (int); break; default: /* should not happen */ #ifdef DIAGNOSTIC panic("ip6_getpcbopt: unexpected option\n"); #endif return (ENOPROTOOPT); } return (sooptcopyout(sopt, optdata, optdatalen)); } void ip6_clearpktopts(struct ip6_pktopts *pktopt, int optname) { if (pktopt == NULL) return; if (optname == -1 || optname == IPV6_PKTINFO) { if (pktopt->ip6po_pktinfo) FREE(pktopt->ip6po_pktinfo, M_IP6OPT); pktopt->ip6po_pktinfo = NULL; } if (optname == -1 || optname == IPV6_HOPLIMIT) pktopt->ip6po_hlim = -1; if (optname == -1 || optname == IPV6_TCLASS) pktopt->ip6po_tclass = -1; if (optname == -1 || optname == IPV6_NEXTHOP) { ROUTE_RELEASE(&pktopt->ip6po_nextroute); if (pktopt->ip6po_nexthop) FREE(pktopt->ip6po_nexthop, M_IP6OPT); pktopt->ip6po_nexthop = NULL; } if (optname == -1 || optname == IPV6_HOPOPTS) { if (pktopt->ip6po_hbh) FREE(pktopt->ip6po_hbh, M_IP6OPT); pktopt->ip6po_hbh = NULL; } if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { if (pktopt->ip6po_dest1) FREE(pktopt->ip6po_dest1, M_IP6OPT); pktopt->ip6po_dest1 = NULL; } if (optname == -1 || optname == IPV6_RTHDR) { if (pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) FREE(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; ROUTE_RELEASE(&pktopt->ip6po_route); } if (optname == -1 || optname == IPV6_DSTOPTS) { if (pktopt->ip6po_dest2) FREE(pktopt->ip6po_dest2, M_IP6OPT); pktopt->ip6po_dest2 = NULL; } } #define PKTOPT_EXTHDRCPY(type) do { \ if (src->type) { \ int hlen = \ (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3; \ dst->type = _MALLOC(hlen, M_IP6OPT, canwait); \ if (dst->type == NULL && canwait == M_NOWAIT) \ goto bad; \ bcopy(src->type, dst->type, hlen); \ } \ } while (0) static int copypktopts(struct ip6_pktopts *dst, struct ip6_pktopts *src, int canwait) { if (dst == NULL || src == NULL) { printf("copypktopts: invalid argument\n"); return (EINVAL); } dst->ip6po_hlim = src->ip6po_hlim; dst->ip6po_tclass = src->ip6po_tclass; dst->ip6po_flags = src->ip6po_flags; if (src->ip6po_pktinfo) { dst->ip6po_pktinfo = _MALLOC(sizeof (*dst->ip6po_pktinfo), M_IP6OPT, canwait); if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) goto bad; *dst->ip6po_pktinfo = *src->ip6po_pktinfo; } if (src->ip6po_nexthop) { dst->ip6po_nexthop = _MALLOC(src->ip6po_nexthop->sa_len, M_IP6OPT, canwait); if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) goto bad; bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, src->ip6po_nexthop->sa_len); } PKTOPT_EXTHDRCPY(ip6po_hbh); PKTOPT_EXTHDRCPY(ip6po_dest1); PKTOPT_EXTHDRCPY(ip6po_dest2); PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ return (0); bad: ip6_clearpktopts(dst, -1); return (ENOBUFS); } #undef PKTOPT_EXTHDRCPY struct ip6_pktopts * ip6_copypktopts(struct ip6_pktopts *src, int canwait) { int error; struct ip6_pktopts *dst; dst = _MALLOC(sizeof (*dst), M_IP6OPT, canwait); if (dst == NULL) return (NULL); ip6_initpktopts(dst); if ((error = copypktopts(dst, src, canwait)) != 0) { FREE(dst, M_IP6OPT); return (NULL); } return (dst); } void ip6_freepcbopts(struct ip6_pktopts *pktopt) { if (pktopt == NULL) return; ip6_clearpktopts(pktopt, -1); FREE(pktopt, M_IP6OPT); } void ip6_moptions_init(void) { PE_parse_boot_argn("ifa_debug", &im6o_debug, sizeof (im6o_debug)); im6o_size = (im6o_debug == 0) ? sizeof (struct ip6_moptions) : sizeof (struct ip6_moptions_dbg); im6o_zone = zinit(im6o_size, IM6O_ZONE_MAX * im6o_size, 0, IM6O_ZONE_NAME); if (im6o_zone == NULL) { panic("%s: failed allocating %s", __func__, IM6O_ZONE_NAME); /* NOTREACHED */ } zone_change(im6o_zone, Z_EXPAND, TRUE); } void im6o_addref(struct ip6_moptions *im6o, int locked) { if (!locked) IM6O_LOCK(im6o); else IM6O_LOCK_ASSERT_HELD(im6o); if (++im6o->im6o_refcnt == 0) { panic("%s: im6o %p wraparound refcnt\n", __func__, im6o); /* NOTREACHED */ } else if (im6o->im6o_trace != NULL) { (*im6o->im6o_trace)(im6o, TRUE); } if (!locked) IM6O_UNLOCK(im6o); } void im6o_remref(struct ip6_moptions *im6o) { int i; IM6O_LOCK(im6o); if (im6o->im6o_refcnt == 0) { panic("%s: im6o %p negative refcnt", __func__, im6o); /* NOTREACHED */ } else if (im6o->im6o_trace != NULL) { (*im6o->im6o_trace)(im6o, FALSE); } --im6o->im6o_refcnt; if (im6o->im6o_refcnt > 0) { IM6O_UNLOCK(im6o); return; } for (i = 0; i < im6o->im6o_num_memberships; ++i) { struct in6_mfilter *imf; imf = im6o->im6o_mfilters ? &im6o->im6o_mfilters[i] : NULL; if (imf != NULL) im6f_leave(imf); (void) in6_mc_leave(im6o->im6o_membership[i], imf); if (imf != NULL) im6f_purge(imf); IN6M_REMREF(im6o->im6o_membership[i]); im6o->im6o_membership[i] = NULL; } im6o->im6o_num_memberships = 0; if (im6o->im6o_mfilters != NULL) { FREE(im6o->im6o_mfilters, M_IN6MFILTER); im6o->im6o_mfilters = NULL; } if (im6o->im6o_membership != NULL) { FREE(im6o->im6o_membership, M_IP6MOPTS); im6o->im6o_membership = NULL; } IM6O_UNLOCK(im6o); lck_mtx_destroy(&im6o->im6o_lock, ifa_mtx_grp); if (!(im6o->im6o_debug & IFD_ALLOC)) { panic("%s: im6o %p cannot be freed", __func__, im6o); /* NOTREACHED */ } zfree(im6o_zone, im6o); } static void im6o_trace(struct ip6_moptions *im6o, int refhold) { struct ip6_moptions_dbg *im6o_dbg = (struct ip6_moptions_dbg *)im6o; ctrace_t *tr; u_int32_t idx; u_int16_t *cnt; if (!(im6o->im6o_debug & IFD_DEBUG)) { panic("%s: im6o %p has no debug structure", __func__, im6o); /* NOTREACHED */ } if (refhold) { cnt = &im6o_dbg->im6o_refhold_cnt; tr = im6o_dbg->im6o_refhold; } else { cnt = &im6o_dbg->im6o_refrele_cnt; tr = im6o_dbg->im6o_refrele; } idx = atomic_add_16_ov(cnt, 1) % IM6O_TRACE_HIST_SIZE; ctrace_record(&tr[idx]); } struct ip6_moptions * ip6_allocmoptions(int how) { struct ip6_moptions *im6o; im6o = (how == M_WAITOK) ? zalloc(im6o_zone) : zalloc_noblock(im6o_zone); if (im6o != NULL) { bzero(im6o, im6o_size); lck_mtx_init(&im6o->im6o_lock, ifa_mtx_grp, ifa_mtx_attr); im6o->im6o_debug |= IFD_ALLOC; if (im6o_debug != 0) { im6o->im6o_debug |= IFD_DEBUG; im6o->im6o_trace = im6o_trace; } IM6O_ADDREF(im6o); } return (im6o); } /* * Set IPv6 outgoing packet options based on advanced API. */ int ip6_setpktopts(struct mbuf *control, struct ip6_pktopts *opt, struct ip6_pktopts *stickyopt, int uproto) { struct cmsghdr *cm = NULL; if (control == NULL || opt == NULL) return (EINVAL); ip6_initpktopts(opt); if (stickyopt) { int error; /* * If stickyopt is provided, make a local copy of the options * for this particular packet, then override them by ancillary * objects. * XXX: copypktopts() does not copy the cached route to a next * hop (if any). This is not very good in terms of efficiency, * but we can allow this since this option should be rarely * used. */ if ((error = copypktopts(opt, stickyopt, M_NOWAIT)) != 0) return (error); } /* * XXX: Currently, we assume all the optional information is stored * in a single mbuf. */ if (control->m_next) return (EINVAL); if (control->m_len < CMSG_LEN(0)) return (EINVAL); for (cm = M_FIRST_CMSGHDR(control); cm != NULL; cm = M_NXT_CMSGHDR(control, cm)) { int error; if (cm->cmsg_len < sizeof (struct cmsghdr) || cm->cmsg_len > control->m_len) return (EINVAL); if (cm->cmsg_level != IPPROTO_IPV6) continue; error = ip6_setpktopt(cm->cmsg_type, CMSG_DATA(cm), cm->cmsg_len - CMSG_LEN(0), opt, 0, 1, uproto); if (error) return (error); } return (0); } /* * Set a particular packet option, as a sticky option or an ancillary data * item. "len" can be 0 only when it's a sticky option. * We have 4 cases of combination of "sticky" and "cmsg": * "sticky=0, cmsg=0": impossible * "sticky=0, cmsg=1": RFC2292 or RFC3542 ancillary data * "sticky=1, cmsg=0": RFC3542 socket option * "sticky=1, cmsg=1": RFC2292 socket option */ static int ip6_setpktopt(int optname, u_char *buf, int len, struct ip6_pktopts *opt, int sticky, int cmsg, int uproto) { int minmtupolicy, preftemp; int error; boolean_t capture_exthdrstat_out = FALSE; if (!sticky && !cmsg) { #ifdef DIAGNOSTIC printf("ip6_setpktopt: impossible case\n"); #endif return (EINVAL); } /* * Caller must have ensured that the buffer is at least * aligned on 32-bit boundary. */ VERIFY(IS_P2ALIGNED(buf, sizeof (u_int32_t))); /* * IPV6_2292xxx is for backward compatibility to RFC2292, and should * not be specified in the context of RFC3542. Conversely, * RFC3542 types should not be specified in the context of RFC2292. */ if (!cmsg) { switch (optname) { case IPV6_2292PKTINFO: case IPV6_2292HOPLIMIT: case IPV6_2292NEXTHOP: case IPV6_2292HOPOPTS: case IPV6_2292DSTOPTS: case IPV6_2292RTHDR: case IPV6_2292PKTOPTIONS: return (ENOPROTOOPT); } } if (sticky && cmsg) { switch (optname) { case IPV6_PKTINFO: case IPV6_HOPLIMIT: case IPV6_NEXTHOP: case IPV6_HOPOPTS: case IPV6_DSTOPTS: case IPV6_RTHDRDSTOPTS: case IPV6_RTHDR: case IPV6_USE_MIN_MTU: case IPV6_DONTFRAG: case IPV6_TCLASS: case IPV6_PREFER_TEMPADDR: /* XXX: not an RFC3542 option */ return (ENOPROTOOPT); } } switch (optname) { case IPV6_2292PKTINFO: case IPV6_PKTINFO: { struct ifnet *ifp = NULL; struct in6_pktinfo *pktinfo; if (len != sizeof (struct in6_pktinfo)) return (EINVAL); pktinfo = (struct in6_pktinfo *)(void *)buf; /* * An application can clear any sticky IPV6_PKTINFO option by * doing a "regular" setsockopt with ipi6_addr being * in6addr_any and ipi6_ifindex being zero. * [RFC 3542, Section 6] */ if (optname == IPV6_PKTINFO && opt->ip6po_pktinfo && pktinfo->ipi6_ifindex == 0 && IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { ip6_clearpktopts(opt, optname); break; } if (uproto == IPPROTO_TCP && optname == IPV6_PKTINFO && sticky && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { return (EINVAL); } /* validate the interface index if specified. */ ifnet_head_lock_shared(); if (pktinfo->ipi6_ifindex > if_index) { ifnet_head_done(); return (ENXIO); } if (pktinfo->ipi6_ifindex) { ifp = ifindex2ifnet[pktinfo->ipi6_ifindex]; if (ifp == NULL) { ifnet_head_done(); return (ENXIO); } } ifnet_head_done(); /* * We store the address anyway, and let in6_selectsrc() * validate the specified address. This is because ipi6_addr * may not have enough information about its scope zone, and * we may need additional information (such as outgoing * interface or the scope zone of a destination address) to * disambiguate the scope. * XXX: the delay of the validation may confuse the * application when it is used as a sticky option. */ if (opt->ip6po_pktinfo == NULL) { opt->ip6po_pktinfo = _MALLOC(sizeof (*pktinfo), M_IP6OPT, M_NOWAIT); if (opt->ip6po_pktinfo == NULL) return (ENOBUFS); } bcopy(pktinfo, opt->ip6po_pktinfo, sizeof (*pktinfo)); break; } case IPV6_2292HOPLIMIT: case IPV6_HOPLIMIT: { int *hlimp; /* * RFC 3542 deprecated the usage of sticky IPV6_HOPLIMIT * to simplify the ordering among hoplimit options. */ if (optname == IPV6_HOPLIMIT && sticky) return (ENOPROTOOPT); if (len != sizeof (int)) return (EINVAL); hlimp = (int *)(void *)buf; if (*hlimp < -1 || *hlimp > 255) return (EINVAL); opt->ip6po_hlim = *hlimp; break; } case IPV6_TCLASS: { int tclass; if (len != sizeof (int)) return (EINVAL); tclass = *(int *)(void *)buf; if (tclass < -1 || tclass > 255) return (EINVAL); opt->ip6po_tclass = tclass; break; } case IPV6_2292NEXTHOP: case IPV6_NEXTHOP: error = suser(kauth_cred_get(), 0); if (error) return (EACCES); if (len == 0) { /* just remove the option */ ip6_clearpktopts(opt, IPV6_NEXTHOP); break; } /* check if cmsg_len is large enough for sa_len */ if (len < sizeof (struct sockaddr) || len < *buf) return (EINVAL); switch (SA(buf)->sa_family) { case AF_INET6: { struct sockaddr_in6 *sa6 = SIN6(buf); if (sa6->sin6_len != sizeof (struct sockaddr_in6)) return (EINVAL); if (IN6_IS_ADDR_UNSPECIFIED(&sa6->sin6_addr) || IN6_IS_ADDR_MULTICAST(&sa6->sin6_addr)) { return (EINVAL); } if ((error = sa6_embedscope(sa6, ip6_use_defzone)) != 0) { return (error); } break; } case AF_LINK: /* should eventually be supported */ default: return (EAFNOSUPPORT); } /* turn off the previous option, then set the new option. */ ip6_clearpktopts(opt, IPV6_NEXTHOP); opt->ip6po_nexthop = _MALLOC(*buf, M_IP6OPT, M_NOWAIT); if (opt->ip6po_nexthop == NULL) return (ENOBUFS); bcopy(buf, opt->ip6po_nexthop, *buf); break; case IPV6_2292HOPOPTS: case IPV6_HOPOPTS: { struct ip6_hbh *hbh; int hbhlen; /* * XXX: We don't allow a non-privileged user to set ANY HbH * options, since per-option restriction has too much * overhead. */ error = suser(kauth_cred_get(), 0); if (error) return (EACCES); if (len == 0) { ip6_clearpktopts(opt, IPV6_HOPOPTS); break; /* just remove the option */ } /* message length validation */ if (len < sizeof (struct ip6_hbh)) return (EINVAL); hbh = (struct ip6_hbh *)(void *)buf; hbhlen = (hbh->ip6h_len + 1) << 3; if (len != hbhlen) return (EINVAL); /* turn off the previous option, then set the new option. */ ip6_clearpktopts(opt, IPV6_HOPOPTS); opt->ip6po_hbh = _MALLOC(hbhlen, M_IP6OPT, M_NOWAIT); if (opt->ip6po_hbh == NULL) return (ENOBUFS); bcopy(hbh, opt->ip6po_hbh, hbhlen); capture_exthdrstat_out = TRUE; break; } case IPV6_2292DSTOPTS: case IPV6_DSTOPTS: case IPV6_RTHDRDSTOPTS: { struct ip6_dest *dest, **newdest = NULL; int destlen; error = suser(kauth_cred_get(), 0); if (error) return (EACCES); if (len == 0) { ip6_clearpktopts(opt, optname); break; /* just remove the option */ } /* message length validation */ if (len < sizeof (struct ip6_dest)) return (EINVAL); dest = (struct ip6_dest *)(void *)buf; destlen = (dest->ip6d_len + 1) << 3; if (len != destlen) return (EINVAL); /* * Determine the position that the destination options header * should be inserted; before or after the routing header. */ switch (optname) { case IPV6_2292DSTOPTS: /* * The old advacned API is ambiguous on this point. * Our approach is to determine the position based * according to the existence of a routing header. * Note, however, that this depends on the order of the * extension headers in the ancillary data; the 1st * part of the destination options header must appear * before the routing header in the ancillary data, * too. * RFC3542 solved the ambiguity by introducing * separate ancillary data or option types. */ if (opt->ip6po_rthdr == NULL) newdest = &opt->ip6po_dest1; else newdest = &opt->ip6po_dest2; break; case IPV6_RTHDRDSTOPTS: newdest = &opt->ip6po_dest1; break; case IPV6_DSTOPTS: newdest = &opt->ip6po_dest2; break; } /* turn off the previous option, then set the new option. */ ip6_clearpktopts(opt, optname); *newdest = _MALLOC(destlen, M_IP6OPT, M_NOWAIT); if (*newdest == NULL) return (ENOBUFS); bcopy(dest, *newdest, destlen); capture_exthdrstat_out = TRUE; break; } case IPV6_2292RTHDR: case IPV6_RTHDR: { struct ip6_rthdr *rth; int rthlen; if (len == 0) { ip6_clearpktopts(opt, IPV6_RTHDR); break; /* just remove the option */ } /* message length validation */ if (len < sizeof (struct ip6_rthdr)) return (EINVAL); rth = (struct ip6_rthdr *)(void *)buf; rthlen = (rth->ip6r_len + 1) << 3; if (len != rthlen) return (EINVAL); switch (rth->ip6r_type) { case IPV6_RTHDR_TYPE_0: if (rth->ip6r_len == 0) /* must contain one addr */ return (EINVAL); if (rth->ip6r_len % 2) /* length must be even */ return (EINVAL); if (rth->ip6r_len / 2 != rth->ip6r_segleft) return (EINVAL); break; default: return (EINVAL); /* not supported */ } /* turn off the previous option */ ip6_clearpktopts(opt, IPV6_RTHDR); opt->ip6po_rthdr = _MALLOC(rthlen, M_IP6OPT, M_NOWAIT); if (opt->ip6po_rthdr == NULL) return (ENOBUFS); bcopy(rth, opt->ip6po_rthdr, rthlen); capture_exthdrstat_out = TRUE; break; } case IPV6_USE_MIN_MTU: if (len != sizeof (int)) return (EINVAL); minmtupolicy = *(int *)(void *)buf; if (minmtupolicy != IP6PO_MINMTU_MCASTONLY && minmtupolicy != IP6PO_MINMTU_DISABLE && minmtupolicy != IP6PO_MINMTU_ALL) { return (EINVAL); } opt->ip6po_minmtu = minmtupolicy; break; case IPV6_DONTFRAG: if (len != sizeof (int)) return (EINVAL); if (uproto == IPPROTO_TCP || *(int *)(void *)buf == 0) { /* * we ignore this option for TCP sockets. * (RFC3542 leaves this case unspecified.) */ opt->ip6po_flags &= ~IP6PO_DONTFRAG; } else { opt->ip6po_flags |= IP6PO_DONTFRAG; } break; case IPV6_PREFER_TEMPADDR: if (len != sizeof (int)) return (EINVAL); preftemp = *(int *)(void *)buf; if (preftemp != IP6PO_TEMPADDR_SYSTEM && preftemp != IP6PO_TEMPADDR_NOTPREFER && preftemp != IP6PO_TEMPADDR_PREFER) { return (EINVAL); } opt->ip6po_prefer_tempaddr = preftemp; break; default: return (ENOPROTOOPT); } /* end of switch */ if (capture_exthdrstat_out) { if (uproto == IPPROTO_TCP) { INC_ATOMIC_INT64_LIM(net_api_stats.nas_sock_inet6_stream_exthdr_out); } else if (uproto == IPPROTO_UDP) { INC_ATOMIC_INT64_LIM(net_api_stats.nas_sock_inet6_dgram_exthdr_out); } } return (0); } /* * Routine called from ip6_output() to loop back a copy of an IP6 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 &loif -- easier than replicating that code here. */ void ip6_mloopback(struct ifnet *srcifp, struct ifnet *origifp, struct mbuf *m, struct sockaddr_in6 *dst, uint32_t optlen, int32_t nxt0) { struct mbuf *copym; struct ip6_hdr *ip6; struct in6_addr src; if (lo_ifp == NULL) return; /* * Copy the packet header as it's needed for the checksum. * Make sure to deep-copy IPv6 header portion in case the data * is in an mbuf cluster, so that we can safely override the IPv6 * header portion later. */ copym = m_copym_mode(m, 0, M_COPYALL, M_DONTWAIT, M_COPYM_COPY_HDR); if (copym != NULL && ((copym->m_flags & M_EXT) || copym->m_len < sizeof (struct ip6_hdr))) copym = m_pullup(copym, sizeof (struct ip6_hdr)); if (copym == NULL) return; ip6 = mtod(copym, struct ip6_hdr *); src = ip6->ip6_src; /* * clear embedded scope identifiers if necessary. * in6_clearscope will touch the addresses only when necessary. */ in6_clearscope(&ip6->ip6_src); in6_clearscope(&ip6->ip6_dst); if (copym->m_pkthdr.csum_flags & CSUM_DELAY_IPV6_DATA) in6_delayed_cksum_offset(copym, 0, optlen, nxt0); /* * Stuff the 'real' ifp into the pkthdr, to be used in matching * in ip6_input(); we need the loopback ifp/dl_tag passed as args * to make the loopback driver compliant with the data link * requirements. */ copym->m_pkthdr.rcvif = origifp; /* * Also record the source interface (which owns the source address). * This is basically a stripped down version of ifa_foraddr6(). */ if (srcifp == NULL) { struct in6_ifaddr *ia; lck_rw_lock_shared(&in6_ifaddr_rwlock); for (ia = in6_ifaddrs; ia != NULL; ia = ia->ia_next) { IFA_LOCK_SPIN(&ia->ia_ifa); /* compare against src addr with embedded scope */ if (IN6_ARE_ADDR_EQUAL(&ia->ia_addr.sin6_addr, &src)) { srcifp = ia->ia_ifp; IFA_UNLOCK(&ia->ia_ifa); break; } IFA_UNLOCK(&ia->ia_ifa); } lck_rw_done(&in6_ifaddr_rwlock); } if (srcifp != NULL) ip6_setsrcifaddr_info(copym, srcifp->if_index, NULL); ip6_setdstifaddr_info(copym, origifp->if_index, NULL); dlil_output(lo_ifp, PF_INET6, copym, NULL, SA(dst), 0, NULL); } /* * Chop IPv6 header off from the payload. */ static int ip6_splithdr(struct mbuf *m, struct ip6_exthdrs *exthdrs) { struct mbuf *mh; struct ip6_hdr *ip6; ip6 = mtod(m, struct ip6_hdr *); if (m->m_len > sizeof (*ip6)) { MGETHDR(mh, M_DONTWAIT, MT_HEADER); /* MAC-OK */ if (mh == NULL) { m_freem(m); return (ENOBUFS); } M_COPY_PKTHDR(mh, m); MH_ALIGN(mh, sizeof (*ip6)); m->m_flags &= ~M_PKTHDR; m->m_len -= sizeof (*ip6); m->m_data += sizeof (*ip6); mh->m_next = m; m = mh; m->m_len = sizeof (*ip6); bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof (*ip6)); } exthdrs->ip6e_ip6 = m; return (0); } static void ip6_output_checksum(struct ifnet *ifp, uint32_t mtu, struct mbuf *m, int nxt0, uint32_t tlen, uint32_t optlen) { uint32_t sw_csum, hwcap = ifp->if_hwassist; int tso = TSO_IPV6_OK(ifp, m); if (!hwcksum_tx) { /* do all in software; checksum offload is disabled */ sw_csum = CSUM_DELAY_IPV6_DATA & 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 (optlen != 0) { sw_csum |= (CSUM_DELAY_IPV6_DATA & m->m_pkthdr.csum_flags); } else if (!(sw_csum & CSUM_DELAY_IPV6_DATA) && (hwcap & CSUM_PARTIAL)) { /* * Partial checksum offload, ere), if no extension headers, * and TCP only (no UDP support, as the hardware may not be * able to convert +0 to -0 (0xffff) per RFC1122 4.1.3.4. * unless the interface supports "invert zero" capability.) */ if (hwcksum_tx && !tso && ((m->m_pkthdr.csum_flags & CSUM_TCPIPV6) || ((hwcap & CSUM_ZERO_INVERT) && (m->m_pkthdr.csum_flags & CSUM_ZERO_INVERT))) && tlen <= mtu) { uint16_t start = sizeof (struct ip6_hdr); 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; sw_csum = 0; } else { sw_csum |= (CSUM_DELAY_IPV6_DATA & m->m_pkthdr.csum_flags); } } if (sw_csum & CSUM_DELAY_IPV6_DATA) { in6_delayed_cksum_offset(m, 0, optlen, nxt0); sw_csum &= ~CSUM_DELAY_IPV6_DATA; } 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; checksum offload is disabled */ m->m_pkthdr.csum_flags = 0; } } /* * Compute IPv6 extension header length. */ int ip6_optlen(struct in6pcb *in6p) { int len; if (!in6p->in6p_outputopts) return (0); len = 0; #define elen(x) \ (((struct ip6_ext *)(x)) ? \ (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) len += elen(in6p->in6p_outputopts->ip6po_hbh); if (in6p->in6p_outputopts->ip6po_rthdr) { /* dest1 is valid with rthdr only */ len += elen(in6p->in6p_outputopts->ip6po_dest1); } len += elen(in6p->in6p_outputopts->ip6po_rthdr); len += elen(in6p->in6p_outputopts->ip6po_dest2); return (len); #undef elen } static int sysctl_reset_ip6_output_stats SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error, i; i = ip6_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 (ip6_output_measure != i && i == 1) { net_perf_initialize(&net_perf, ip6_output_measure_bins); } ip6_output_measure = i; done: return (error); } static int sysctl_ip6_output_measure_bins SYSCTL_HANDLER_ARGS { #pragma unused(arg1, arg2) int error; uint64_t i; i = ip6_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; } ip6_output_measure_bins = i; done: return (error); } static int sysctl_ip6_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))); } |