ip6_input.c revision 249294
1214501Srpaulo/*- 2214501Srpaulo * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3214501Srpaulo * All rights reserved. 4214501Srpaulo * 5252726Srpaulo * Redistribution and use in source and binary forms, with or without 6252726Srpaulo * modification, are permitted provided that the following conditions 7214501Srpaulo * are met: 8214501Srpaulo * 1. Redistributions of source code must retain the above copyright 9214501Srpaulo * notice, this list of conditions and the following disclaimer. 10214501Srpaulo * 2. Redistributions in binary form must reproduce the above copyright 11214501Srpaulo * notice, this list of conditions and the following disclaimer in the 12214501Srpaulo * documentation and/or other materials provided with the distribution. 13214501Srpaulo * 3. Neither the name of the project nor the names of its contributors 14214501Srpaulo * may be used to endorse or promote products derived from this software 15252726Srpaulo * without specific prior written permission. 16214501Srpaulo * 17214501Srpaulo * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18214501Srpaulo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19214501Srpaulo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20214501Srpaulo * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21214501Srpaulo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22214501Srpaulo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23214501Srpaulo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24214501Srpaulo * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25214501Srpaulo * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26214501Srpaulo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27214501Srpaulo * SUCH DAMAGE. 28214501Srpaulo * 29214501Srpaulo * $KAME: ip6_input.c,v 1.259 2002/01/21 04:58:09 jinmei Exp $ 30214501Srpaulo */ 31214501Srpaulo 32214501Srpaulo/*- 33214501Srpaulo * Copyright (c) 1982, 1986, 1988, 1993 34214501Srpaulo * The Regents of the University of California. All rights reserved. 35214501Srpaulo * 36214501Srpaulo * Redistribution and use in source and binary forms, with or without 37214501Srpaulo * modification, are permitted provided that the following conditions 38214501Srpaulo * are met: 39214501Srpaulo * 1. Redistributions of source code must retain the above copyright 40214501Srpaulo * notice, this list of conditions and the following disclaimer. 41214501Srpaulo * 2. Redistributions in binary form must reproduce the above copyright 42214501Srpaulo * notice, this list of conditions and the following disclaimer in the 43214501Srpaulo * documentation and/or other materials provided with the distribution. 44214501Srpaulo * 4. Neither the name of the University nor the names of its contributors 45214501Srpaulo * may be used to endorse or promote products derived from this software 46214501Srpaulo * without specific prior written permission. 47214501Srpaulo * 48214501Srpaulo * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 49214501Srpaulo * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50214501Srpaulo * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51214501Srpaulo * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 52214501Srpaulo * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53214501Srpaulo * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54214501Srpaulo * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55252726Srpaulo * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56252726Srpaulo * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57252726Srpaulo * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58252726Srpaulo * SUCH DAMAGE. 59252726Srpaulo * 60252726Srpaulo * @(#)ip_input.c 8.2 (Berkeley) 1/4/94 61252726Srpaulo */ 62252726Srpaulo 63252726Srpaulo#include <sys/cdefs.h> 64252726Srpaulo__FBSDID("$FreeBSD: head/sys/netinet6/ip6_input.c 249294 2013-04-09 07:11:22Z ae $"); 65252726Srpaulo 66252726Srpaulo#include "opt_inet.h" 67252726Srpaulo#include "opt_inet6.h" 68214501Srpaulo#include "opt_ipfw.h" 69214501Srpaulo#include "opt_ipsec.h" 70214501Srpaulo#include "opt_route.h" 71214501Srpaulo 72214501Srpaulo#include <sys/param.h> 73214501Srpaulo#include <sys/systm.h> 74214501Srpaulo#include <sys/malloc.h> 75214501Srpaulo#include <sys/mbuf.h> 76214501Srpaulo#include <sys/proc.h> 77214501Srpaulo#include <sys/domain.h> 78214501Srpaulo#include <sys/protosw.h> 79252726Srpaulo#include <sys/socket.h> 80252726Srpaulo#include <sys/socketvar.h> 81252726Srpaulo#include <sys/errno.h> 82214501Srpaulo#include <sys/time.h> 83214501Srpaulo#include <sys/kernel.h> 84214501Srpaulo#include <sys/syslog.h> 85214501Srpaulo 86214501Srpaulo#include <net/if.h> 87214501Srpaulo#include <net/if_types.h> 88214501Srpaulo#include <net/if_dl.h> 89214501Srpaulo#include <net/route.h> 90214501Srpaulo#include <net/netisr.h> 91214501Srpaulo#include <net/pfil.h> 92214501Srpaulo#include <net/vnet.h> 93214501Srpaulo 94214501Srpaulo#include <netinet/in.h> 95214501Srpaulo#include <netinet/ip_var.h> 96214501Srpaulo#include <netinet/in_systm.h> 97214501Srpaulo#include <net/if_llatbl.h> 98214501Srpaulo#ifdef INET 99214501Srpaulo#include <netinet/ip.h> 100214501Srpaulo#include <netinet/ip_icmp.h> 101214501Srpaulo#endif /* INET */ 102214501Srpaulo#include <netinet/ip6.h> 103214501Srpaulo#include <netinet6/in6_var.h> 104214501Srpaulo#include <netinet6/ip6_var.h> 105214501Srpaulo#include <netinet/in_pcb.h> 106214501Srpaulo#include <netinet/icmp6.h> 107214501Srpaulo#include <netinet6/scope6_var.h> 108214501Srpaulo#include <netinet6/in6_ifattach.h> 109214501Srpaulo#include <netinet6/nd6.h> 110214501Srpaulo 111214501Srpaulo#ifdef IPSEC 112214501Srpaulo#include <netipsec/ipsec.h> 113214501Srpaulo#include <netinet6/ip6_ipsec.h> 114214501Srpaulo#include <netipsec/ipsec6.h> 115214501Srpaulo#endif /* IPSEC */ 116214501Srpaulo 117214501Srpaulo#include <netinet6/ip6protosw.h> 118214501Srpaulo 119214501Srpaulo#ifdef FLOWTABLE 120214501Srpaulo#include <net/flowtable.h> 121214501SrpauloVNET_DECLARE(int, ip6_output_flowtable_size); 122214501Srpaulo#define V_ip6_output_flowtable_size VNET(ip6_output_flowtable_size) 123214501Srpaulo#endif 124214501Srpaulo 125214501Srpauloextern struct domain inet6domain; 126214501Srpaulo 127214501Srpaulou_char ip6_protox[IPPROTO_MAX]; 128214501SrpauloVNET_DEFINE(struct in6_ifaddrhead, in6_ifaddrhead); 129214501SrpauloVNET_DEFINE(struct in6_ifaddrlisthead *, in6_ifaddrhashtbl); 130214501SrpauloVNET_DEFINE(u_long, in6_ifaddrhmask); 131214501Srpaulo 132214501Srpaulostatic struct netisr_handler ip6_nh = { 133214501Srpaulo .nh_name = "ip6", 134214501Srpaulo .nh_handler = ip6_input, 135214501Srpaulo .nh_proto = NETISR_IPV6, 136214501Srpaulo .nh_policy = NETISR_POLICY_FLOW, 137214501Srpaulo}; 138214501Srpaulo 139214501SrpauloVNET_DECLARE(struct callout, in6_tmpaddrtimer_ch); 140214501Srpaulo#define V_in6_tmpaddrtimer_ch VNET(in6_tmpaddrtimer_ch) 141214501Srpaulo 142214501SrpauloVNET_DEFINE(struct pfil_head, inet6_pfil_hook); 143214501Srpaulo 144214501SrpauloVNET_DEFINE(struct ip6stat, ip6stat); 145214501Srpaulo 146214501Srpaulostruct rwlock in6_ifaddr_lock; 147214501SrpauloRW_SYSINIT(in6_ifaddr_lock, &in6_ifaddr_lock, "in6_ifaddr_lock"); 148214501Srpaulo 149214501Srpaulostatic void ip6_init2(void *); 150214501Srpaulostatic struct ip6aux *ip6_setdstifaddr(struct mbuf *, struct in6_ifaddr *); 151214501Srpaulostatic struct ip6aux *ip6_addaux(struct mbuf *); 152214501Srpaulostatic struct ip6aux *ip6_findaux(struct mbuf *m); 153214501Srpaulostatic void ip6_delaux (struct mbuf *); 154214501Srpaulostatic int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *); 155214501Srpaulo#ifdef PULLDOWN_TEST 156214501Srpaulostatic struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int); 157214501Srpaulo#endif 158214501Srpaulo 159214501Srpaulo/* 160214501Srpaulo * IP6 initialization: fill in IP6 protocol switch table. 161214501Srpaulo * All protocols not implemented in kernel go to raw IP6 protocol handler. 162214501Srpaulo */ 163214501Srpaulovoid 164214501Srpauloip6_init(void) 165214501Srpaulo{ 166214501Srpaulo struct ip6protosw *pr; 167214501Srpaulo int i; 168214501Srpaulo 169214501Srpaulo TUNABLE_INT_FETCH("net.inet6.ip6.auto_linklocal", 170214501Srpaulo &V_ip6_auto_linklocal); 171214501Srpaulo TUNABLE_INT_FETCH("net.inet6.ip6.accept_rtadv", &V_ip6_accept_rtadv); 172214501Srpaulo TUNABLE_INT_FETCH("net.inet6.ip6.no_radr", &V_ip6_no_radr); 173214501Srpaulo 174214501Srpaulo TAILQ_INIT(&V_in6_ifaddrhead); 175214501Srpaulo V_in6_ifaddrhashtbl = hashinit(IN6ADDR_NHASH, M_IFADDR, 176214501Srpaulo &V_in6_ifaddrhmask); 177214501Srpaulo 178214501Srpaulo /* Initialize packet filter hooks. */ 179214501Srpaulo V_inet6_pfil_hook.ph_type = PFIL_TYPE_AF; 180214501Srpaulo V_inet6_pfil_hook.ph_af = AF_INET6; 181214501Srpaulo if ((i = pfil_head_register(&V_inet6_pfil_hook)) != 0) 182214501Srpaulo printf("%s: WARNING: unable to register pfil hook, " 183214501Srpaulo "error %d\n", __func__, i); 184214501Srpaulo 185214501Srpaulo scope6_init(); 186214501Srpaulo addrsel_policy_init(); 187214501Srpaulo nd6_init(); 188214501Srpaulo frag6_init(); 189214501Srpaulo 190214501Srpaulo#ifdef FLOWTABLE 191214501Srpaulo if (TUNABLE_INT_FETCH("net.inet6.ip6.output_flowtable_size", 192214501Srpaulo &V_ip6_output_flowtable_size)) { 193214501Srpaulo if (V_ip6_output_flowtable_size < 256) 194214501Srpaulo V_ip6_output_flowtable_size = 256; 195214501Srpaulo if (!powerof2(V_ip6_output_flowtable_size)) { 196214501Srpaulo printf("flowtable must be power of 2 size\n"); 197214501Srpaulo V_ip6_output_flowtable_size = 2048; 198214501Srpaulo } 199214501Srpaulo } else { 200214501Srpaulo /* 201214501Srpaulo * round up to the next power of 2 202214501Srpaulo */ 203214501Srpaulo V_ip6_output_flowtable_size = 1 << fls((1024 + maxusers * 64)-1); 204214501Srpaulo } 205214501Srpaulo V_ip6_ft = flowtable_alloc("ipv6", V_ip6_output_flowtable_size, FL_IPV6|FL_PCPU); 206214501Srpaulo#endif 207214501Srpaulo 208214501Srpaulo V_ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR; 209214501Srpaulo 210214501Srpaulo /* Skip global initialization stuff for non-default instances. */ 211214501Srpaulo if (!IS_DEFAULT_VNET(curvnet)) 212214501Srpaulo return; 213214501Srpaulo 214214501Srpaulo#ifdef DIAGNOSTIC 215214501Srpaulo if (sizeof(struct protosw) != sizeof(struct ip6protosw)) 216214501Srpaulo panic("sizeof(protosw) != sizeof(ip6protosw)"); 217214501Srpaulo#endif 218214501Srpaulo pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 219214501Srpaulo if (pr == NULL) 220214501Srpaulo panic("ip6_init"); 221214501Srpaulo 222214501Srpaulo /* Initialize the entire ip6_protox[] array to IPPROTO_RAW. */ 223214501Srpaulo for (i = 0; i < IPPROTO_MAX; i++) 224214501Srpaulo ip6_protox[i] = pr - inet6sw; 225214501Srpaulo /* 226214501Srpaulo * Cycle through IP protocols and put them into the appropriate place 227214501Srpaulo * in ip6_protox[]. 228214501Srpaulo */ 229214501Srpaulo for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 230214501Srpaulo pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) 231214501Srpaulo if (pr->pr_domain->dom_family == PF_INET6 && 232214501Srpaulo pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW) { 233214501Srpaulo /* Be careful to only index valid IP protocols. */ 234214501Srpaulo if (pr->pr_protocol < IPPROTO_MAX) 235214501Srpaulo ip6_protox[pr->pr_protocol] = pr - inet6sw; 236214501Srpaulo } 237214501Srpaulo 238214501Srpaulo netisr_register(&ip6_nh); 239214501Srpaulo} 240214501Srpaulo 241214501Srpaulo/* 242214501Srpaulo * The protocol to be inserted into ip6_protox[] must be already registered 243214501Srpaulo * in inet6sw[], either statically or through pf_proto_register(). 244214501Srpaulo */ 245214501Srpauloint 246214501Srpauloip6proto_register(short ip6proto) 247214501Srpaulo{ 248214501Srpaulo struct ip6protosw *pr; 249214501Srpaulo 250214501Srpaulo /* Sanity checks. */ 251214501Srpaulo if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 252214501Srpaulo return (EPROTONOSUPPORT); 253214501Srpaulo 254214501Srpaulo /* 255214501Srpaulo * The protocol slot must not be occupied by another protocol 256214501Srpaulo * already. An index pointing to IPPROTO_RAW is unused. 257214501Srpaulo */ 258214501Srpaulo pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 259214501Srpaulo if (pr == NULL) 260214501Srpaulo return (EPFNOSUPPORT); 261214501Srpaulo if (ip6_protox[ip6proto] != pr - inet6sw) /* IPPROTO_RAW */ 262214501Srpaulo return (EEXIST); 263214501Srpaulo 264214501Srpaulo /* 265214501Srpaulo * Find the protocol position in inet6sw[] and set the index. 266214501Srpaulo */ 267214501Srpaulo for (pr = (struct ip6protosw *)inet6domain.dom_protosw; 268214501Srpaulo pr < (struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++) { 269214501Srpaulo if (pr->pr_domain->dom_family == PF_INET6 && 270214501Srpaulo pr->pr_protocol && pr->pr_protocol == ip6proto) { 271214501Srpaulo ip6_protox[pr->pr_protocol] = pr - inet6sw; 272214501Srpaulo return (0); 273214501Srpaulo } 274214501Srpaulo } 275214501Srpaulo return (EPROTONOSUPPORT); 276214501Srpaulo} 277214501Srpaulo 278214501Srpauloint 279214501Srpauloip6proto_unregister(short ip6proto) 280214501Srpaulo{ 281214501Srpaulo struct ip6protosw *pr; 282214501Srpaulo 283214501Srpaulo /* Sanity checks. */ 284214501Srpaulo if (ip6proto <= 0 || ip6proto >= IPPROTO_MAX) 285214501Srpaulo return (EPROTONOSUPPORT); 286214501Srpaulo 287214501Srpaulo /* Check if the protocol was indeed registered. */ 288214501Srpaulo pr = (struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW); 289214501Srpaulo if (pr == NULL) 290214501Srpaulo return (EPFNOSUPPORT); 291214501Srpaulo if (ip6_protox[ip6proto] == pr - inet6sw) /* IPPROTO_RAW */ 292214501Srpaulo return (ENOENT); 293214501Srpaulo 294214501Srpaulo /* Reset the protocol slot to IPPROTO_RAW. */ 295214501Srpaulo ip6_protox[ip6proto] = pr - inet6sw; 296214501Srpaulo return (0); 297214501Srpaulo} 298214501Srpaulo 299214501Srpaulo#ifdef VIMAGE 300214501Srpaulovoid 301214501Srpauloip6_destroy() 302214501Srpaulo{ 303214501Srpaulo 304214501Srpaulo hashdestroy(V_in6_ifaddrhashtbl, M_IFADDR, V_in6_ifaddrhmask); 305214501Srpaulo nd6_destroy(); 306214501Srpaulo callout_drain(&V_in6_tmpaddrtimer_ch); 307214501Srpaulo} 308214501Srpaulo#endif 309214501Srpaulo 310214501Srpaulostatic int 311214501Srpauloip6_init2_vnet(const void *unused __unused) 312214501Srpaulo{ 313214501Srpaulo 314214501Srpaulo /* nd6_timer_init */ 315214501Srpaulo callout_init(&V_nd6_timer_ch, 0); 316214501Srpaulo callout_reset(&V_nd6_timer_ch, hz, nd6_timer, curvnet); 317214501Srpaulo 318214501Srpaulo /* timer for regeneranation of temporary addresses randomize ID */ 319214501Srpaulo callout_init(&V_in6_tmpaddrtimer_ch, 0); 320214501Srpaulo callout_reset(&V_in6_tmpaddrtimer_ch, 321214501Srpaulo (V_ip6_temp_preferred_lifetime - V_ip6_desync_factor - 322214501Srpaulo V_ip6_temp_regen_advance) * hz, 323214501Srpaulo in6_tmpaddrtimer, curvnet); 324252726Srpaulo 325214501Srpaulo return (0); 326214501Srpaulo} 327214501Srpaulo 328214501Srpaulostatic void 329214501Srpauloip6_init2(void *dummy) 330214501Srpaulo{ 331214501Srpaulo 332214501Srpaulo ip6_init2_vnet(NULL); 333214501Srpaulo} 334214501Srpaulo 335214501Srpaulo/* cheat */ 336214501Srpaulo/* This must be after route_init(), which is now SI_ORDER_THIRD */ 337214501SrpauloSYSINIT(netinet6init2, SI_SUB_PROTO_DOMAIN, SI_ORDER_MIDDLE, ip6_init2, NULL); 338214501Srpaulo 339214501Srpaulostatic int 340214501Srpauloip6_input_hbh(struct mbuf *m, uint32_t *plen, uint32_t *rtalert, int *off, 341214501Srpaulo int *nxt, int *ours) 342214501Srpaulo{ 343214501Srpaulo struct ip6_hdr *ip6; 344214501Srpaulo struct ip6_hbh *hbh; 345214501Srpaulo 346214501Srpaulo if (ip6_hopopts_input(plen, rtalert, &m, off)) { 347214501Srpaulo#if 0 /*touches NULL pointer*/ 348214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 349214501Srpaulo#endif 350214501Srpaulo goto out; /* m have already been freed */ 351214501Srpaulo } 352214501Srpaulo 353214501Srpaulo /* adjust pointer */ 354214501Srpaulo ip6 = mtod(m, struct ip6_hdr *); 355214501Srpaulo 356214501Srpaulo /* 357214501Srpaulo * if the payload length field is 0 and the next header field 358214501Srpaulo * indicates Hop-by-Hop Options header, then a Jumbo Payload 359214501Srpaulo * option MUST be included. 360214501Srpaulo */ 361214501Srpaulo if (ip6->ip6_plen == 0 && *plen == 0) { 362214501Srpaulo /* 363214501Srpaulo * Note that if a valid jumbo payload option is 364214501Srpaulo * contained, ip6_hopopts_input() must set a valid 365214501Srpaulo * (non-zero) payload length to the variable plen. 366214501Srpaulo */ 367214501Srpaulo IP6STAT_INC(ip6s_badoptions); 368214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 369214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 370214501Srpaulo icmp6_error(m, ICMP6_PARAM_PROB, 371214501Srpaulo ICMP6_PARAMPROB_HEADER, 372214501Srpaulo (caddr_t)&ip6->ip6_plen - (caddr_t)ip6); 373214501Srpaulo goto out; 374214501Srpaulo } 375214501Srpaulo#ifndef PULLDOWN_TEST 376214501Srpaulo /* ip6_hopopts_input() ensures that mbuf is contiguous */ 377214501Srpaulo hbh = (struct ip6_hbh *)(ip6 + 1); 378214501Srpaulo#else 379214501Srpaulo IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 380214501Srpaulo sizeof(struct ip6_hbh)); 381214501Srpaulo if (hbh == NULL) { 382214501Srpaulo IP6STAT_INC(ip6s_tooshort); 383214501Srpaulo goto out; 384214501Srpaulo } 385214501Srpaulo#endif 386214501Srpaulo *nxt = hbh->ip6h_nxt; 387214501Srpaulo 388214501Srpaulo /* 389214501Srpaulo * If we are acting as a router and the packet contains a 390214501Srpaulo * router alert option, see if we know the option value. 391214501Srpaulo * Currently, we only support the option value for MLD, in which 392214501Srpaulo * case we should pass the packet to the multicast routing 393214501Srpaulo * daemon. 394214501Srpaulo */ 395214501Srpaulo if (*rtalert != ~0) { 396214501Srpaulo switch (*rtalert) { 397214501Srpaulo case IP6OPT_RTALERT_MLD: 398214501Srpaulo if (V_ip6_forwarding) 399214501Srpaulo *ours = 1; 400214501Srpaulo break; 401214501Srpaulo default: 402214501Srpaulo /* 403214501Srpaulo * RFC2711 requires unrecognized values must be 404214501Srpaulo * silently ignored. 405214501Srpaulo */ 406214501Srpaulo break; 407214501Srpaulo } 408214501Srpaulo } 409214501Srpaulo 410214501Srpaulo return (0); 411214501Srpaulo 412214501Srpauloout: 413214501Srpaulo return (1); 414214501Srpaulo} 415214501Srpaulo 416214501Srpaulovoid 417214501Srpauloip6_input(struct mbuf *m) 418214501Srpaulo{ 419214501Srpaulo struct ip6_hdr *ip6; 420214501Srpaulo int off = sizeof(struct ip6_hdr), nest; 421214501Srpaulo u_int32_t plen; 422214501Srpaulo u_int32_t rtalert = ~0; 423214501Srpaulo int nxt, ours = 0; 424214501Srpaulo struct ifnet *deliverifp = NULL, *ifp = NULL; 425214501Srpaulo struct in6_addr odst; 426214501Srpaulo struct route_in6 rin6; 427214501Srpaulo int srcrt = 0; 428214501Srpaulo struct llentry *lle = NULL; 429214501Srpaulo struct sockaddr_in6 dst6, *dst; 430214501Srpaulo 431214501Srpaulo bzero(&rin6, sizeof(struct route_in6)); 432214501Srpaulo#ifdef IPSEC 433214501Srpaulo /* 434214501Srpaulo * should the inner packet be considered authentic? 435214501Srpaulo * see comment in ah4_input(). 436214501Srpaulo * NB: m cannot be NULL when passed to the input routine 437214501Srpaulo */ 438214501Srpaulo 439214501Srpaulo m->m_flags &= ~M_AUTHIPHDR; 440214501Srpaulo m->m_flags &= ~M_AUTHIPDGM; 441214501Srpaulo 442214501Srpaulo#endif /* IPSEC */ 443214501Srpaulo 444214501Srpaulo /* 445214501Srpaulo * make sure we don't have onion peering information into m_tag. 446214501Srpaulo */ 447214501Srpaulo ip6_delaux(m); 448214501Srpaulo 449214501Srpaulo if (m->m_flags & M_FASTFWD_OURS) { 450214501Srpaulo /* 451214501Srpaulo * Firewall changed destination to local. 452214501Srpaulo */ 453214501Srpaulo m->m_flags &= ~M_FASTFWD_OURS; 454214501Srpaulo ours = 1; 455214501Srpaulo deliverifp = m->m_pkthdr.rcvif; 456214501Srpaulo ip6 = mtod(m, struct ip6_hdr *); 457214501Srpaulo goto hbhcheck; 458214501Srpaulo } 459214501Srpaulo 460214501Srpaulo /* 461214501Srpaulo * mbuf statistics 462214501Srpaulo */ 463214501Srpaulo if (m->m_flags & M_EXT) { 464214501Srpaulo if (m->m_next) 465214501Srpaulo IP6STAT_INC(ip6s_mext2m); 466214501Srpaulo else 467214501Srpaulo IP6STAT_INC(ip6s_mext1); 468214501Srpaulo } else { 469214501Srpaulo#define M2MMAX (sizeof(V_ip6stat.ip6s_m2m)/sizeof(V_ip6stat.ip6s_m2m[0])) 470214501Srpaulo if (m->m_next) { 471214501Srpaulo if (m->m_flags & M_LOOP) { 472214501Srpaulo IP6STAT_INC(ip6s_m2m[V_loif->if_index]); 473214501Srpaulo } else if (m->m_pkthdr.rcvif->if_index < M2MMAX) 474214501Srpaulo IP6STAT_INC( 475214501Srpaulo ip6s_m2m[m->m_pkthdr.rcvif->if_index]); 476214501Srpaulo else 477214501Srpaulo IP6STAT_INC(ip6s_m2m[0]); 478214501Srpaulo } else 479214501Srpaulo IP6STAT_INC(ip6s_m1); 480214501Srpaulo#undef M2MMAX 481214501Srpaulo } 482214501Srpaulo 483214501Srpaulo /* drop the packet if IPv6 operation is disabled on the IF */ 484214501Srpaulo if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) { 485214501Srpaulo m_freem(m); 486214501Srpaulo return; 487252726Srpaulo } 488252726Srpaulo 489214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive); 490214501Srpaulo IP6STAT_INC(ip6s_total); 491214501Srpaulo 492214501Srpaulo#ifndef PULLDOWN_TEST 493214501Srpaulo /* 494214501Srpaulo * L2 bridge code and some other code can return mbuf chain 495214501Srpaulo * that does not conform to KAME requirement. too bad. 496214501Srpaulo * XXX: fails to join if interface MTU > MCLBYTES. jumbogram? 497214501Srpaulo */ 498214501Srpaulo if (m && m->m_next != NULL && m->m_pkthdr.len < MCLBYTES) { 499214501Srpaulo struct mbuf *n; 500214501Srpaulo 501214501Srpaulo if (m->m_pkthdr.len > MHLEN) 502214501Srpaulo n = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR); 503214501Srpaulo else 504214501Srpaulo n = m_gethdr(M_NOWAIT, MT_DATA); 505214501Srpaulo if (n == NULL) { 506214501Srpaulo m_freem(m); 507214501Srpaulo return; /* ENOBUFS */ 508214501Srpaulo } 509214501Srpaulo 510214501Srpaulo m_move_pkthdr(n, m); 511214501Srpaulo m_copydata(m, 0, n->m_pkthdr.len, mtod(n, caddr_t)); 512214501Srpaulo n->m_len = n->m_pkthdr.len; 513214501Srpaulo m_freem(m); 514214501Srpaulo m = n; 515214501Srpaulo } 516214501Srpaulo IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /* nothing */); 517214501Srpaulo#endif 518214501Srpaulo 519214501Srpaulo if (m->m_len < sizeof(struct ip6_hdr)) { 520214501Srpaulo struct ifnet *inifp; 521252726Srpaulo inifp = m->m_pkthdr.rcvif; 522214501Srpaulo if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) { 523214501Srpaulo IP6STAT_INC(ip6s_toosmall); 524214501Srpaulo in6_ifstat_inc(inifp, ifs6_in_hdrerr); 525214501Srpaulo return; 526214501Srpaulo } 527214501Srpaulo } 528214501Srpaulo 529214501Srpaulo ip6 = mtod(m, struct ip6_hdr *); 530214501Srpaulo 531214501Srpaulo if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 532214501Srpaulo IP6STAT_INC(ip6s_badvers); 533214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr); 534214501Srpaulo goto bad; 535214501Srpaulo } 536214501Srpaulo 537214501Srpaulo IP6STAT_INC(ip6s_nxthist[ip6->ip6_nxt]); 538214501Srpaulo 539214501Srpaulo /* 540214501Srpaulo * Check against address spoofing/corruption. 541214501Srpaulo */ 542214501Srpaulo if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) || 543214501Srpaulo IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) { 544214501Srpaulo /* 545214501Srpaulo * XXX: "badscope" is not very suitable for a multicast source. 546214501Srpaulo */ 547214501Srpaulo IP6STAT_INC(ip6s_badscope); 548214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 549214501Srpaulo goto bad; 550214501Srpaulo } 551214501Srpaulo if (IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) && 552214501Srpaulo !(m->m_flags & M_LOOP)) { 553214501Srpaulo /* 554214501Srpaulo * In this case, the packet should come from the loopback 555214501Srpaulo * interface. However, we cannot just check the if_flags, 556214501Srpaulo * because ip6_mloopback() passes the "actual" interface 557214501Srpaulo * as the outgoing/incoming interface. 558252726Srpaulo */ 559252726Srpaulo IP6STAT_INC(ip6s_badscope); 560252726Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 561252726Srpaulo goto bad; 562252726Srpaulo } 563252726Srpaulo 564252726Srpaulo#ifdef ALTQ 565252726Srpaulo if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { 566252726Srpaulo /* packet is dropped by traffic conditioner */ 567252726Srpaulo return; 568252726Srpaulo } 569252726Srpaulo#endif 570252726Srpaulo /* 571252726Srpaulo * The following check is not documented in specs. A malicious 572252726Srpaulo * party may be able to use IPv4 mapped addr to confuse tcp/udp stack 573252726Srpaulo * and bypass security checks (act as if it was from 127.0.0.1 by using 574252726Srpaulo * IPv6 src ::ffff:127.0.0.1). Be cautious. 575252726Srpaulo * 576252726Srpaulo * This check chokes if we are in an SIIT cloud. As none of BSDs 577252726Srpaulo * support IPv4-less kernel compilation, we cannot support SIIT 578252726Srpaulo * environment at all. So, it makes more sense for us to reject any 579214501Srpaulo * malicious packets for non-SIIT environment, than try to do a 580214501Srpaulo * partial support for SIIT environment. 581214501Srpaulo */ 582214501Srpaulo if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 583214501Srpaulo IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 584214501Srpaulo IP6STAT_INC(ip6s_badscope); 585252726Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 586252726Srpaulo goto bad; 587214501Srpaulo } 588214501Srpaulo#if 0 589214501Srpaulo /* 590214501Srpaulo * Reject packets with IPv4 compatible addresses (auto tunnel). 591214501Srpaulo * 592214501Srpaulo * The code forbids auto tunnel relay case in RFC1933 (the check is 593214501Srpaulo * stronger than RFC1933). We may want to re-enable it if mech-xx 594214501Srpaulo * is revised to forbid relaying case. 595214501Srpaulo */ 596214501Srpaulo if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) || 597214501Srpaulo IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { 598214501Srpaulo IP6STAT_INC(ip6s_badscope); 599214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 600214501Srpaulo goto bad; 601214501Srpaulo } 602214501Srpaulo#endif 603214501Srpaulo#ifdef IPSEC 604214501Srpaulo /* 605214501Srpaulo * Bypass packet filtering for packets previously handled by IPsec. 606214501Srpaulo */ 607214501Srpaulo if (ip6_ipsec_filtertunnel(m)) 608252726Srpaulo goto passin; 609214501Srpaulo#endif /* IPSEC */ 610214501Srpaulo 611214501Srpaulo /* 612214501Srpaulo * Run through list of hooks for input packets. 613214501Srpaulo * 614214501Srpaulo * NB: Beware of the destination address changing 615214501Srpaulo * (e.g. by NAT rewriting). When this happens, 616214501Srpaulo * tell ip6_forward to do the right thing. 617214501Srpaulo */ 618214501Srpaulo odst = ip6->ip6_dst; 619214501Srpaulo 620214501Srpaulo /* Jump over all PFIL processing if hooks are not active. */ 621214501Srpaulo if (!PFIL_HOOKED(&V_inet6_pfil_hook)) 622214501Srpaulo goto passin; 623214501Srpaulo 624214501Srpaulo if (pfil_run_hooks(&V_inet6_pfil_hook, &m, 625214501Srpaulo m->m_pkthdr.rcvif, PFIL_IN, NULL)) 626214501Srpaulo return; 627214501Srpaulo if (m == NULL) /* consumed by filter */ 628214501Srpaulo return; 629214501Srpaulo ip6 = mtod(m, struct ip6_hdr *); 630214501Srpaulo srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst); 631214501Srpaulo 632214501Srpaulo if (m->m_flags & M_FASTFWD_OURS) { 633214501Srpaulo m->m_flags &= ~M_FASTFWD_OURS; 634214501Srpaulo ours = 1; 635214501Srpaulo deliverifp = m->m_pkthdr.rcvif; 636214501Srpaulo goto hbhcheck; 637214501Srpaulo } 638214501Srpaulo if ((m->m_flags & M_IP6_NEXTHOP) && 639214501Srpaulo m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) { 640214501Srpaulo /* 641214501Srpaulo * Directly ship the packet on. This allows forwarding 642214501Srpaulo * packets originally destined to us to some other directly 643214501Srpaulo * connected host. 644214501Srpaulo */ 645214501Srpaulo ip6_forward(m, 1); 646214501Srpaulo goto out; 647214501Srpaulo } 648214501Srpaulo 649214501Srpaulopassin: 650214501Srpaulo /* 651214501Srpaulo * Disambiguate address scope zones (if there is ambiguity). 652214501Srpaulo * We first make sure that the original source or destination address 653214501Srpaulo * is not in our internal form for scoped addresses. Such addresses 654214501Srpaulo * are not necessarily invalid spec-wise, but we cannot accept them due 655214501Srpaulo * to the usage conflict. 656214501Srpaulo * in6_setscope() then also checks and rejects the cases where src or 657214501Srpaulo * dst are the loopback address and the receiving interface 658214501Srpaulo * is not loopback. 659214501Srpaulo */ 660214501Srpaulo if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) { 661214501Srpaulo IP6STAT_INC(ip6s_badscope); /* XXX */ 662214501Srpaulo goto bad; 663214501Srpaulo } 664214501Srpaulo if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) || 665214501Srpaulo in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) { 666214501Srpaulo IP6STAT_INC(ip6s_badscope); 667214501Srpaulo goto bad; 668214501Srpaulo } 669214501Srpaulo 670214501Srpaulo /* 671214501Srpaulo * Multicast check. Assume packet is for us to avoid 672214501Srpaulo * prematurely taking locks. 673214501Srpaulo */ 674214501Srpaulo if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 675214501Srpaulo ours = 1; 676214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast); 677214501Srpaulo deliverifp = m->m_pkthdr.rcvif; 678214501Srpaulo goto hbhcheck; 679214501Srpaulo } 680214501Srpaulo 681214501Srpaulo /* 682214501Srpaulo * Unicast check 683214501Srpaulo */ 684214501Srpaulo 685214501Srpaulo bzero(&dst6, sizeof(dst6)); 686214501Srpaulo dst6.sin6_family = AF_INET6; 687214501Srpaulo dst6.sin6_len = sizeof(struct sockaddr_in6); 688214501Srpaulo dst6.sin6_addr = ip6->ip6_dst; 689214501Srpaulo ifp = m->m_pkthdr.rcvif; 690214501Srpaulo IF_AFDATA_RLOCK(ifp); 691214501Srpaulo lle = lla_lookup(LLTABLE6(ifp), 0, 692214501Srpaulo (struct sockaddr *)&dst6); 693214501Srpaulo IF_AFDATA_RUNLOCK(ifp); 694214501Srpaulo if ((lle != NULL) && (lle->la_flags & LLE_IFADDR)) { 695214501Srpaulo struct ifaddr *ifa; 696214501Srpaulo struct in6_ifaddr *ia6; 697214501Srpaulo int bad; 698214501Srpaulo 699214501Srpaulo bad = 1; 700214501Srpaulo#define sa_equal(a1, a2) \ 701214501Srpaulo (bcmp((a1), (a2), ((a1))->sin6_len) == 0) 702214501Srpaulo IF_ADDR_RLOCK(ifp); 703214501Srpaulo TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { 704214501Srpaulo if (ifa->ifa_addr->sa_family != dst6.sin6_family) 705214501Srpaulo continue; 706214501Srpaulo if (sa_equal(&dst6, ifa->ifa_addr)) 707214501Srpaulo break; 708214501Srpaulo } 709214501Srpaulo KASSERT(ifa != NULL, ("%s: ifa not found for lle %p", 710214501Srpaulo __func__, lle)); 711214501Srpaulo#undef sa_equal 712214501Srpaulo 713214501Srpaulo ia6 = (struct in6_ifaddr *)ifa; 714214501Srpaulo if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 715214501Srpaulo /* Count the packet in the ip address stats */ 716214501Srpaulo ia6->ia_ifa.if_ipackets++; 717252726Srpaulo ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 718252726Srpaulo 719214501Srpaulo /* 720214501Srpaulo * record address information into m_tag. 721214501Srpaulo */ 722214501Srpaulo (void)ip6_setdstifaddr(m, ia6); 723214501Srpaulo 724214501Srpaulo bad = 0; 725214501Srpaulo } else { 726214501Srpaulo char ip6bufs[INET6_ADDRSTRLEN]; 727214501Srpaulo char ip6bufd[INET6_ADDRSTRLEN]; 728214501Srpaulo /* address is not ready, so discard the packet. */ 729214501Srpaulo nd6log((LOG_INFO, 730214501Srpaulo "ip6_input: packet to an unready address %s->%s\n", 731214501Srpaulo ip6_sprintf(ip6bufs, &ip6->ip6_src), 732214501Srpaulo ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 733214501Srpaulo } 734214501Srpaulo IF_ADDR_RUNLOCK(ifp); 735214501Srpaulo LLE_RUNLOCK(lle); 736214501Srpaulo if (bad) 737214501Srpaulo goto bad; 738214501Srpaulo else { 739214501Srpaulo ours = 1; 740214501Srpaulo deliverifp = ifp; 741214501Srpaulo goto hbhcheck; 742214501Srpaulo } 743214501Srpaulo } 744214501Srpaulo if (lle != NULL) 745214501Srpaulo LLE_RUNLOCK(lle); 746214501Srpaulo 747214501Srpaulo dst = &rin6.ro_dst; 748214501Srpaulo dst->sin6_len = sizeof(struct sockaddr_in6); 749214501Srpaulo dst->sin6_family = AF_INET6; 750214501Srpaulo dst->sin6_addr = ip6->ip6_dst; 751214501Srpaulo rin6.ro_rt = in6_rtalloc1((struct sockaddr *)dst, 0, 0, M_GETFIB(m)); 752214501Srpaulo if (rin6.ro_rt) 753214501Srpaulo RT_UNLOCK(rin6.ro_rt); 754214501Srpaulo 755214501Srpaulo#define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key)) 756214501Srpaulo 757252726Srpaulo /* 758252726Srpaulo * Accept the packet if the forwarding interface to the destination 759252726Srpaulo * according to the routing table is the loopback interface, 760214501Srpaulo * unless the associated route has a gateway. 761214501Srpaulo * Note that this approach causes to accept a packet if there is a 762214501Srpaulo * route to the loopback interface for the destination of the packet. 763214501Srpaulo * But we think it's even useful in some situations, e.g. when using 764214501Srpaulo * a special daemon which wants to intercept the packet. 765324739Sgordon * 766324739Sgordon * XXX: some OSes automatically make a cloned route for the destination 767324739Sgordon * of an outgoing packet. If the outgoing interface of the packet 768324739Sgordon * is a loopback one, the kernel would consider the packet to be 769324739Sgordon * accepted, even if we have no such address assinged on the interface. 770324739Sgordon * We check the cloned flag of the route entry to reject such cases, 771324739Sgordon * assuming that route entries for our own addresses are not made by 772324739Sgordon * cloning (it should be true because in6_addloop explicitly installs 773214501Srpaulo * the host route). However, we might have to do an explicit check 774214501Srpaulo * while it would be less efficient. Or, should we rather install a 775214501Srpaulo * reject route for such a case? 776214501Srpaulo */ 777214501Srpaulo if (rin6.ro_rt && 778214501Srpaulo (rin6.ro_rt->rt_flags & 779214501Srpaulo (RTF_HOST|RTF_GATEWAY)) == RTF_HOST && 780214501Srpaulo#ifdef RTF_WASCLONED 781214501Srpaulo !(rin6.ro_rt->rt_flags & RTF_WASCLONED) && 782214501Srpaulo#endif 783214501Srpaulo#ifdef RTF_CLONED 784214501Srpaulo !(rin6.ro_rt->rt_flags & RTF_CLONED) && 785324739Sgordon#endif 786214501Srpaulo#if 0 787214501Srpaulo /* 788214501Srpaulo * The check below is redundant since the comparison of 789214501Srpaulo * the destination and the key of the rtentry has 790214501Srpaulo * already done through looking up the routing table. 791214501Srpaulo */ 792214501Srpaulo IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 793214501Srpaulo &rt6_key(rin6.ro_rt)->sin6_addr) 794214501Srpaulo#endif 795214501Srpaulo rin6.ro_rt->rt_ifp->if_type == IFT_LOOP) { 796214501Srpaulo int free_ia6 = 0; 797214501Srpaulo struct in6_ifaddr *ia6; 798214501Srpaulo 799214501Srpaulo /* 800214501Srpaulo * found the loopback route to the interface address 801214501Srpaulo */ 802214501Srpaulo if (rin6.ro_rt->rt_gateway->sa_family == AF_LINK) { 803214501Srpaulo struct sockaddr_in6 dest6; 804214501Srpaulo 805214501Srpaulo bzero(&dest6, sizeof(dest6)); 806214501Srpaulo dest6.sin6_family = AF_INET6; 807214501Srpaulo dest6.sin6_len = sizeof(dest6); 808214501Srpaulo dest6.sin6_addr = ip6->ip6_dst; 809214501Srpaulo ia6 = (struct in6_ifaddr *) 810214501Srpaulo ifa_ifwithaddr((struct sockaddr *)&dest6); 811214501Srpaulo if (ia6 == NULL) 812214501Srpaulo goto bad; 813214501Srpaulo free_ia6 = 1; 814214501Srpaulo } 815214501Srpaulo else 816214501Srpaulo ia6 = (struct in6_ifaddr *)rin6.ro_rt->rt_ifa; 817214501Srpaulo 818214501Srpaulo /* 819214501Srpaulo * record address information into m_tag. 820214501Srpaulo */ 821214501Srpaulo (void)ip6_setdstifaddr(m, ia6); 822214501Srpaulo 823214501Srpaulo /* 824214501Srpaulo * packets to a tentative, duplicated, or somehow invalid 825214501Srpaulo * address must not be accepted. 826214501Srpaulo */ 827214501Srpaulo if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) { 828214501Srpaulo /* this address is ready */ 829214501Srpaulo ours = 1; 830214501Srpaulo deliverifp = ia6->ia_ifp; /* correct? */ 831214501Srpaulo /* Count the packet in the ip address stats */ 832214501Srpaulo ia6->ia_ifa.if_ipackets++; 833214501Srpaulo ia6->ia_ifa.if_ibytes += m->m_pkthdr.len; 834214501Srpaulo if (ia6 != NULL && free_ia6 != 0) 835214501Srpaulo ifa_free(&ia6->ia_ifa); 836214501Srpaulo goto hbhcheck; 837214501Srpaulo } else { 838214501Srpaulo char ip6bufs[INET6_ADDRSTRLEN]; 839214501Srpaulo char ip6bufd[INET6_ADDRSTRLEN]; 840214501Srpaulo /* address is not ready, so discard the packet. */ 841214501Srpaulo nd6log((LOG_INFO, 842214501Srpaulo "ip6_input: packet to an unready address %s->%s\n", 843214501Srpaulo ip6_sprintf(ip6bufs, &ip6->ip6_src), 844214501Srpaulo ip6_sprintf(ip6bufd, &ip6->ip6_dst))); 845214501Srpaulo 846214501Srpaulo if (ia6 != NULL && free_ia6 != 0) 847214501Srpaulo ifa_free(&ia6->ia_ifa); 848214501Srpaulo goto bad; 849214501Srpaulo } 850214501Srpaulo } 851214501Srpaulo 852214501Srpaulo /* 853214501Srpaulo * FAITH (Firewall Aided Internet Translator) 854214501Srpaulo */ 855214501Srpaulo if (V_ip6_keepfaith) { 856214501Srpaulo if (rin6.ro_rt && rin6.ro_rt->rt_ifp && 857214501Srpaulo rin6.ro_rt->rt_ifp->if_type == IFT_FAITH) { 858214501Srpaulo /* XXX do we need more sanity checks? */ 859214501Srpaulo ours = 1; 860214501Srpaulo deliverifp = rin6.ro_rt->rt_ifp; /* faith */ 861214501Srpaulo goto hbhcheck; 862214501Srpaulo } 863214501Srpaulo } 864214501Srpaulo 865214501Srpaulo /* 866214501Srpaulo * Now there is no reason to process the packet if it's not our own 867214501Srpaulo * and we're not a router. 868214501Srpaulo */ 869214501Srpaulo if (!V_ip6_forwarding) { 870214501Srpaulo IP6STAT_INC(ip6s_cantforward); 871214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 872214501Srpaulo goto bad; 873214501Srpaulo } 874214501Srpaulo 875214501Srpaulo hbhcheck: 876214501Srpaulo /* 877214501Srpaulo * record address information into m_tag, if we don't have one yet. 878214501Srpaulo * note that we are unable to record it, if the address is not listed 879252726Srpaulo * as our interface address (e.g. multicast addresses, addresses 880214501Srpaulo * within FAITH prefixes and such). 881214501Srpaulo */ 882214501Srpaulo if (deliverifp) { 883214501Srpaulo struct in6_ifaddr *ia6; 884214501Srpaulo 885214501Srpaulo if ((ia6 = ip6_getdstifaddr(m)) != NULL) { 886214501Srpaulo ifa_free(&ia6->ia_ifa); 887214501Srpaulo } else { 888214501Srpaulo ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst); 889214501Srpaulo if (ia6) { 890252726Srpaulo if (!ip6_setdstifaddr(m, ia6)) { 891214501Srpaulo /* 892214501Srpaulo * XXX maybe we should drop the packet here, 893214501Srpaulo * as we could not provide enough information 894214501Srpaulo * to the upper layers. 895214501Srpaulo */ 896214501Srpaulo } 897214501Srpaulo ifa_free(&ia6->ia_ifa); 898214501Srpaulo } 899324739Sgordon } 900214501Srpaulo } 901214501Srpaulo 902214501Srpaulo /* 903214501Srpaulo * Process Hop-by-Hop options header if it's contained. 904214501Srpaulo * m may be modified in ip6_hopopts_input(). 905214501Srpaulo * If a JumboPayload option is included, plen will also be modified. 906214501Srpaulo */ 907214501Srpaulo plen = (u_int32_t)ntohs(ip6->ip6_plen); 908214501Srpaulo if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 909214501Srpaulo int error; 910214501Srpaulo 911214501Srpaulo error = ip6_input_hbh(m, &plen, &rtalert, &off, &nxt, &ours); 912214501Srpaulo if (error != 0) 913214501Srpaulo goto out; 914214501Srpaulo } else 915214501Srpaulo nxt = ip6->ip6_nxt; 916214501Srpaulo 917214501Srpaulo /* 918214501Srpaulo * Check that the amount of data in the buffers 919214501Srpaulo * is as at least much as the IPv6 header would have us expect. 920214501Srpaulo * Trim mbufs if longer than we expect. 921214501Srpaulo * Drop packet if shorter than we expect. 922214501Srpaulo */ 923214501Srpaulo if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) { 924214501Srpaulo IP6STAT_INC(ip6s_tooshort); 925214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 926214501Srpaulo goto bad; 927214501Srpaulo } 928214501Srpaulo if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) { 929214501Srpaulo if (m->m_len == m->m_pkthdr.len) { 930214501Srpaulo m->m_len = sizeof(struct ip6_hdr) + plen; 931214501Srpaulo m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen; 932214501Srpaulo } else 933214501Srpaulo m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len); 934214501Srpaulo } 935214501Srpaulo 936214501Srpaulo /* 937214501Srpaulo * Forward if desirable. 938214501Srpaulo */ 939214501Srpaulo if (V_ip6_mrouter && 940214501Srpaulo IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { 941214501Srpaulo /* 942214501Srpaulo * If we are acting as a multicast router, all 943214501Srpaulo * incoming multicast packets are passed to the 944214501Srpaulo * kernel-level multicast forwarding function. 945214501Srpaulo * The packet is returned (relatively) intact; if 946214501Srpaulo * ip6_mforward() returns a non-zero value, the packet 947214501Srpaulo * must be discarded, else it may be accepted below. 948214501Srpaulo * 949214501Srpaulo * XXX TODO: Check hlim and multicast scope here to avoid 950214501Srpaulo * unnecessarily calling into ip6_mforward(). 951214501Srpaulo */ 952214501Srpaulo if (ip6_mforward && 953214501Srpaulo ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) { 954214501Srpaulo IP6STAT_INC(ip6s_cantforward); 955214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard); 956214501Srpaulo goto bad; 957214501Srpaulo } 958214501Srpaulo } else if (!ours) { 959214501Srpaulo ip6_forward(m, srcrt); 960214501Srpaulo goto out; 961214501Srpaulo } 962214501Srpaulo 963214501Srpaulo ip6 = mtod(m, struct ip6_hdr *); 964214501Srpaulo 965214501Srpaulo /* 966214501Srpaulo * Malicious party may be able to use IPv4 mapped addr to confuse 967214501Srpaulo * tcp/udp stack and bypass security checks (act as if it was from 968214501Srpaulo * 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious. 969214501Srpaulo * 970214501Srpaulo * For SIIT end node behavior, you may want to disable the check. 971214501Srpaulo * However, you will become vulnerable to attacks using IPv4 mapped 972214501Srpaulo * source. 973214501Srpaulo */ 974214501Srpaulo if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || 975214501Srpaulo IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { 976214501Srpaulo IP6STAT_INC(ip6s_badscope); 977214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); 978214501Srpaulo goto bad; 979214501Srpaulo } 980214501Srpaulo 981214501Srpaulo /* 982214501Srpaulo * Tell launch routine the next header 983214501Srpaulo */ 984214501Srpaulo IP6STAT_INC(ip6s_delivered); 985214501Srpaulo in6_ifstat_inc(deliverifp, ifs6_in_deliver); 986214501Srpaulo nest = 0; 987214501Srpaulo 988214501Srpaulo while (nxt != IPPROTO_DONE) { 989214501Srpaulo if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) { 990214501Srpaulo IP6STAT_INC(ip6s_toomanyhdr); 991214501Srpaulo goto bad; 992214501Srpaulo } 993214501Srpaulo 994214501Srpaulo /* 995214501Srpaulo * protection against faulty packet - there should be 996214501Srpaulo * more sanity checks in header chain processing. 997214501Srpaulo */ 998214501Srpaulo if (m->m_pkthdr.len < off) { 999214501Srpaulo IP6STAT_INC(ip6s_tooshort); 1000214501Srpaulo in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated); 1001214501Srpaulo goto bad; 1002214501Srpaulo } 1003214501Srpaulo 1004214501Srpaulo#ifdef IPSEC 1005214501Srpaulo /* 1006214501Srpaulo * enforce IPsec policy checking if we are seeing last header. 1007214501Srpaulo * note that we do not visit this with protocols with pcb layer 1008214501Srpaulo * code - like udp/tcp/raw ip. 1009214501Srpaulo */ 1010214501Srpaulo if (ip6_ipsec_input(m, nxt)) 1011214501Srpaulo goto bad; 1012214501Srpaulo#endif /* IPSEC */ 1013214501Srpaulo 1014214501Srpaulo /* 1015214501Srpaulo * Use mbuf flags to propagate Router Alert option to 1016214501Srpaulo * ICMPv6 layer, as hop-by-hop options have been stripped. 1017214501Srpaulo */ 1018214501Srpaulo if (nxt == IPPROTO_ICMPV6 && rtalert != ~0) 1019214501Srpaulo m->m_flags |= M_RTALERT_MLD; 1020214501Srpaulo 1021214501Srpaulo nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt); 1022214501Srpaulo } 1023214501Srpaulo goto out; 1024214501Srpaulobad: 1025214501Srpaulo m_freem(m); 1026214501Srpauloout: 1027214501Srpaulo if (rin6.ro_rt) 1028214501Srpaulo RTFREE(rin6.ro_rt); 1029214501Srpaulo} 1030214501Srpaulo 1031214501Srpaulo/* 1032214501Srpaulo * set/grab in6_ifaddr correspond to IPv6 destination address. 1033214501Srpaulo * XXX backward compatibility wrapper 1034214501Srpaulo * 1035214501Srpaulo * XXXRW: We should bump the refcount on ia6 before sticking it in the m_tag, 1036214501Srpaulo * and then bump it when the tag is copied, and release it when the tag is 1037214501Srpaulo * freed. Unfortunately, m_tags don't support deep copies (yet), so instead 1038214501Srpaulo * we just bump the ia refcount when we receive it. This should be fixed. 1039214501Srpaulo */ 1040214501Srpaulostatic struct ip6aux * 1041214501Srpauloip6_setdstifaddr(struct mbuf *m, struct in6_ifaddr *ia6) 1042214501Srpaulo{ 1043214501Srpaulo struct ip6aux *ip6a; 1044214501Srpaulo 1045214501Srpaulo ip6a = ip6_addaux(m); 1046214501Srpaulo if (ip6a) 1047214501Srpaulo ip6a->ip6a_dstia6 = ia6; 1048214501Srpaulo return ip6a; /* NULL if failed to set */ 1049214501Srpaulo} 1050214501Srpaulo 1051214501Srpaulostruct in6_ifaddr * 1052214501Srpauloip6_getdstifaddr(struct mbuf *m) 1053214501Srpaulo{ 1054214501Srpaulo struct ip6aux *ip6a; 1055214501Srpaulo struct in6_ifaddr *ia; 1056214501Srpaulo 1057214501Srpaulo ip6a = ip6_findaux(m); 1058214501Srpaulo if (ip6a) { 1059214501Srpaulo ia = ip6a->ip6a_dstia6; 1060214501Srpaulo ifa_ref(&ia->ia_ifa); 1061214501Srpaulo return ia; 1062214501Srpaulo } else 1063214501Srpaulo return NULL; 1064214501Srpaulo} 1065214501Srpaulo 1066214501Srpaulo/* 1067214501Srpaulo * Hop-by-Hop options header processing. If a valid jumbo payload option is 1068214501Srpaulo * included, the real payload length will be stored in plenp. 1069214501Srpaulo * 1070214501Srpaulo * rtalertp - XXX: should be stored more smart way 1071214501Srpaulo */ 1072214501Srpaulostatic int 1073214501Srpauloip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp, 1074214501Srpaulo struct mbuf **mp, int *offp) 1075214501Srpaulo{ 1076214501Srpaulo struct mbuf *m = *mp; 1077214501Srpaulo int off = *offp, hbhlen; 1078214501Srpaulo struct ip6_hbh *hbh; 1079214501Srpaulo u_int8_t *opt; 1080214501Srpaulo 1081214501Srpaulo /* validation of the length of the header */ 1082214501Srpaulo#ifndef PULLDOWN_TEST 1083214501Srpaulo IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1); 1084214501Srpaulo hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1085214501Srpaulo hbhlen = (hbh->ip6h_len + 1) << 3; 1086214501Srpaulo 1087252726Srpaulo IP6_EXTHDR_CHECK(m, off, hbhlen, -1); 1088214501Srpaulo hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off); 1089214501Srpaulo#else 1090214501Srpaulo IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, 1091214501Srpaulo sizeof(struct ip6_hdr), sizeof(struct ip6_hbh)); 1092214501Srpaulo if (hbh == NULL) { 1093214501Srpaulo IP6STAT_INC(ip6s_tooshort); 1094214501Srpaulo return -1; 1095214501Srpaulo } 1096214501Srpaulo hbhlen = (hbh->ip6h_len + 1) << 3; 1097214501Srpaulo IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr), 1098214501Srpaulo hbhlen); 1099214501Srpaulo if (hbh == NULL) { 1100214501Srpaulo IP6STAT_INC(ip6s_tooshort); 1101214501Srpaulo return -1; 1102214501Srpaulo } 1103214501Srpaulo#endif 1104214501Srpaulo off += hbhlen; 1105214501Srpaulo hbhlen -= sizeof(struct ip6_hbh); 1106214501Srpaulo opt = (u_int8_t *)hbh + sizeof(struct ip6_hbh); 1107252726Srpaulo 1108252726Srpaulo if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh), 1109214501Srpaulo hbhlen, rtalertp, plenp) < 0) 1110214501Srpaulo return (-1); 1111252726Srpaulo 1112252726Srpaulo *offp = off; 1113252726Srpaulo *mp = m; 1114252726Srpaulo return (0); 1115252726Srpaulo} 1116252726Srpaulo 1117214501Srpaulo/* 1118214501Srpaulo * Search header for all Hop-by-hop options and process each option. 1119214501Srpaulo * This function is separate from ip6_hopopts_input() in order to 1120214501Srpaulo * handle a case where the sending node itself process its hop-by-hop 1121214501Srpaulo * options header. In such a case, the function is called from ip6_output(). 1122214501Srpaulo * 1123214501Srpaulo * The function assumes that hbh header is located right after the IPv6 header 1124214501Srpaulo * (RFC2460 p7), opthead is pointer into data content in m, and opthead to 1125214501Srpaulo * opthead + hbhlen is located in contiguous memory region. 1126214501Srpaulo */ 1127214501Srpauloint 1128214501Srpauloip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen, 1129214501Srpaulo u_int32_t *rtalertp, u_int32_t *plenp) 1130214501Srpaulo{ 1131214501Srpaulo struct ip6_hdr *ip6; 1132214501Srpaulo int optlen = 0; 1133214501Srpaulo u_int8_t *opt = opthead; 1134214501Srpaulo u_int16_t rtalert_val; 1135214501Srpaulo u_int32_t jumboplen; 1136214501Srpaulo const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh); 1137214501Srpaulo 1138214501Srpaulo for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) { 1139214501Srpaulo switch (*opt) { 1140214501Srpaulo case IP6OPT_PAD1: 1141214501Srpaulo optlen = 1; 1142214501Srpaulo break; 1143214501Srpaulo case IP6OPT_PADN: 1144214501Srpaulo if (hbhlen < IP6OPT_MINLEN) { 1145214501Srpaulo IP6STAT_INC(ip6s_toosmall); 1146214501Srpaulo goto bad; 1147214501Srpaulo } 1148214501Srpaulo optlen = *(opt + 1) + 2; 1149214501Srpaulo break; 1150214501Srpaulo case IP6OPT_ROUTER_ALERT: 1151214501Srpaulo /* XXX may need check for alignment */ 1152214501Srpaulo if (hbhlen < IP6OPT_RTALERT_LEN) { 1153214501Srpaulo IP6STAT_INC(ip6s_toosmall); 1154214501Srpaulo goto bad; 1155214501Srpaulo } 1156214501Srpaulo if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) { 1157214501Srpaulo /* XXX stat */ 1158214501Srpaulo icmp6_error(m, ICMP6_PARAM_PROB, 1159214501Srpaulo ICMP6_PARAMPROB_HEADER, 1160214501Srpaulo erroff + opt + 1 - opthead); 1161214501Srpaulo return (-1); 1162214501Srpaulo } 1163214501Srpaulo optlen = IP6OPT_RTALERT_LEN; 1164214501Srpaulo bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2); 1165214501Srpaulo *rtalertp = ntohs(rtalert_val); 1166214501Srpaulo break; 1167214501Srpaulo case IP6OPT_JUMBO: 1168214501Srpaulo /* XXX may need check for alignment */ 1169214501Srpaulo if (hbhlen < IP6OPT_JUMBO_LEN) { 1170214501Srpaulo IP6STAT_INC(ip6s_toosmall); 1171214501Srpaulo goto bad; 1172214501Srpaulo } 1173214501Srpaulo if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) { 1174214501Srpaulo /* XXX stat */ 1175214501Srpaulo icmp6_error(m, ICMP6_PARAM_PROB, 1176214501Srpaulo ICMP6_PARAMPROB_HEADER, 1177214501Srpaulo erroff + opt + 1 - opthead); 1178214501Srpaulo return (-1); 1179214501Srpaulo } 1180214501Srpaulo optlen = IP6OPT_JUMBO_LEN; 1181214501Srpaulo 1182214501Srpaulo /* 1183214501Srpaulo * IPv6 packets that have non 0 payload length 1184214501Srpaulo * must not contain a jumbo payload option. 1185214501Srpaulo */ 1186214501Srpaulo ip6 = mtod(m, struct ip6_hdr *); 1187214501Srpaulo if (ip6->ip6_plen) { 1188214501Srpaulo IP6STAT_INC(ip6s_badoptions); 1189214501Srpaulo icmp6_error(m, ICMP6_PARAM_PROB, 1190214501Srpaulo ICMP6_PARAMPROB_HEADER, 1191214501Srpaulo erroff + opt - opthead); 1192214501Srpaulo return (-1); 1193214501Srpaulo } 1194214501Srpaulo 1195214501Srpaulo /* 1196214501Srpaulo * We may see jumbolen in unaligned location, so 1197214501Srpaulo * we'd need to perform bcopy(). 1198214501Srpaulo */ 1199214501Srpaulo bcopy(opt + 2, &jumboplen, sizeof(jumboplen)); 1200214501Srpaulo jumboplen = (u_int32_t)htonl(jumboplen); 1201214501Srpaulo 1202214501Srpaulo#if 1 1203214501Srpaulo /* 1204214501Srpaulo * if there are multiple jumbo payload options, 1205214501Srpaulo * *plenp will be non-zero and the packet will be 1206214501Srpaulo * rejected. 1207214501Srpaulo * the behavior may need some debate in ipngwg - 1208214501Srpaulo * multiple options does not make sense, however, 1209214501Srpaulo * there's no explicit mention in specification. 1210214501Srpaulo */ 1211214501Srpaulo if (*plenp != 0) { 1212214501Srpaulo IP6STAT_INC(ip6s_badoptions); 1213214501Srpaulo icmp6_error(m, ICMP6_PARAM_PROB, 1214214501Srpaulo ICMP6_PARAMPROB_HEADER, 1215214501Srpaulo erroff + opt + 2 - opthead); 1216214501Srpaulo return (-1); 1217214501Srpaulo } 1218214501Srpaulo#endif 1219214501Srpaulo 1220214501Srpaulo /* 1221214501Srpaulo * jumbo payload length must be larger than 65535. 1222214501Srpaulo */ 1223214501Srpaulo if (jumboplen <= IPV6_MAXPACKET) { 1224214501Srpaulo IP6STAT_INC(ip6s_badoptions); 1225214501Srpaulo icmp6_error(m, ICMP6_PARAM_PROB, 1226214501Srpaulo ICMP6_PARAMPROB_HEADER, 1227214501Srpaulo erroff + opt + 2 - opthead); 1228214501Srpaulo return (-1); 1229214501Srpaulo } 1230214501Srpaulo *plenp = jumboplen; 1231214501Srpaulo 1232214501Srpaulo break; 1233214501Srpaulo default: /* unknown option */ 1234214501Srpaulo if (hbhlen < IP6OPT_MINLEN) { 1235214501Srpaulo IP6STAT_INC(ip6s_toosmall); 1236214501Srpaulo goto bad; 1237214501Srpaulo } 1238214501Srpaulo optlen = ip6_unknown_opt(opt, m, 1239214501Srpaulo erroff + opt - opthead); 1240214501Srpaulo if (optlen == -1) 1241214501Srpaulo return (-1); 1242214501Srpaulo optlen += 2; 1243214501Srpaulo break; 1244214501Srpaulo } 1245214501Srpaulo } 1246214501Srpaulo 1247214501Srpaulo return (0); 1248214501Srpaulo 1249214501Srpaulo bad: 1250214501Srpaulo m_freem(m); 1251214501Srpaulo return (-1); 1252214501Srpaulo} 1253214501Srpaulo 1254214501Srpaulo/* 1255214501Srpaulo * Unknown option processing. 1256214501Srpaulo * The third argument `off' is the offset from the IPv6 header to the option, 1257214501Srpaulo * which is necessary if the IPv6 header the and option header and IPv6 header 1258214501Srpaulo * is not contiguous in order to return an ICMPv6 error. 1259214501Srpaulo */ 1260214501Srpauloint 1261214501Srpauloip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off) 1262214501Srpaulo{ 1263214501Srpaulo struct ip6_hdr *ip6; 1264214501Srpaulo 1265214501Srpaulo switch (IP6OPT_TYPE(*optp)) { 1266214501Srpaulo case IP6OPT_TYPE_SKIP: /* ignore the option */ 1267214501Srpaulo return ((int)*(optp + 1)); 1268214501Srpaulo case IP6OPT_TYPE_DISCARD: /* silently discard */ 1269214501Srpaulo m_freem(m); 1270214501Srpaulo return (-1); 1271214501Srpaulo case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */ 1272214501Srpaulo IP6STAT_INC(ip6s_badoptions); 1273214501Srpaulo icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off); 1274214501Srpaulo return (-1); 1275214501Srpaulo case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */ 1276214501Srpaulo IP6STAT_INC(ip6s_badoptions); 1277214501Srpaulo ip6 = mtod(m, struct ip6_hdr *); 1278214501Srpaulo if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || 1279214501Srpaulo (m->m_flags & (M_BCAST|M_MCAST))) 1280214501Srpaulo m_freem(m); 1281214501Srpaulo else 1282214501Srpaulo icmp6_error(m, ICMP6_PARAM_PROB, 1283214501Srpaulo ICMP6_PARAMPROB_OPTION, off); 1284214501Srpaulo return (-1); 1285214501Srpaulo } 1286214501Srpaulo 1287214501Srpaulo m_freem(m); /* XXX: NOTREACHED */ 1288214501Srpaulo return (-1); 1289214501Srpaulo} 1290214501Srpaulo 1291214501Srpaulo/* 1292214501Srpaulo * Create the "control" list for this pcb. 1293214501Srpaulo * These functions will not modify mbuf chain at all. 1294214501Srpaulo * 1295214501Srpaulo * With KAME mbuf chain restriction: 1296214501Srpaulo * The routine will be called from upper layer handlers like tcp6_input(). 1297214501Srpaulo * Thus the routine assumes that the caller (tcp6_input) have already 1298214501Srpaulo * called IP6_EXTHDR_CHECK() and all the extension headers are located in the 1299214501Srpaulo * very first mbuf on the mbuf chain. 1300214501Srpaulo * 1301214501Srpaulo * ip6_savecontrol_v4 will handle those options that are possible to be 1302214501Srpaulo * set on a v4-mapped socket. 1303214501Srpaulo * ip6_savecontrol will directly call ip6_savecontrol_v4 to handle those 1304214501Srpaulo * options and handle the v6-only ones itself. 1305214501Srpaulo */ 1306214501Srpaulostruct mbuf ** 1307214501Srpauloip6_savecontrol_v4(struct inpcb *inp, struct mbuf *m, struct mbuf **mp, 1308214501Srpaulo int *v4only) 1309214501Srpaulo{ 1310214501Srpaulo struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1311214501Srpaulo 1312214501Srpaulo#ifdef SO_TIMESTAMP 1313214501Srpaulo if ((inp->inp_socket->so_options & SO_TIMESTAMP) != 0) { 1314214501Srpaulo struct timeval tv; 1315214501Srpaulo 1316214501Srpaulo microtime(&tv); 1317214501Srpaulo *mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv), 1318214501Srpaulo SCM_TIMESTAMP, SOL_SOCKET); 1319214501Srpaulo if (*mp) 1320214501Srpaulo mp = &(*mp)->m_next; 1321214501Srpaulo } 1322214501Srpaulo#endif 1323214501Srpaulo 1324214501Srpaulo#define IS2292(inp, x, y) (((inp)->inp_flags & IN6P_RFC2292) ? (x) : (y)) 1325214501Srpaulo /* RFC 2292 sec. 5 */ 1326214501Srpaulo if ((inp->inp_flags & IN6P_PKTINFO) != 0) { 1327214501Srpaulo struct in6_pktinfo pi6; 1328214501Srpaulo 1329214501Srpaulo if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1330214501Srpaulo#ifdef INET 1331214501Srpaulo struct ip *ip; 1332214501Srpaulo 1333214501Srpaulo ip = mtod(m, struct ip *); 1334214501Srpaulo pi6.ipi6_addr.s6_addr32[0] = 0; 1335214501Srpaulo pi6.ipi6_addr.s6_addr32[1] = 0; 1336214501Srpaulo pi6.ipi6_addr.s6_addr32[2] = IPV6_ADDR_INT32_SMP; 1337214501Srpaulo pi6.ipi6_addr.s6_addr32[3] = ip->ip_dst.s_addr; 1338214501Srpaulo#else 1339214501Srpaulo /* We won't hit this code */ 1340214501Srpaulo bzero(&pi6.ipi6_addr, sizeof(struct in6_addr)); 1341214501Srpaulo#endif 1342214501Srpaulo } else { 1343214501Srpaulo bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr)); 1344214501Srpaulo in6_clearscope(&pi6.ipi6_addr); /* XXX */ 1345214501Srpaulo } 1346214501Srpaulo pi6.ipi6_ifindex = 1347214501Srpaulo (m && m->m_pkthdr.rcvif) ? m->m_pkthdr.rcvif->if_index : 0; 1348214501Srpaulo 1349214501Srpaulo *mp = sbcreatecontrol((caddr_t) &pi6, 1350214501Srpaulo sizeof(struct in6_pktinfo), 1351214501Srpaulo IS2292(inp, IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6); 1352214501Srpaulo if (*mp) 1353214501Srpaulo mp = &(*mp)->m_next; 1354214501Srpaulo } 1355214501Srpaulo 1356214501Srpaulo if ((inp->inp_flags & IN6P_HOPLIMIT) != 0) { 1357214501Srpaulo int hlim; 1358214501Srpaulo 1359214501Srpaulo if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1360214501Srpaulo#ifdef INET 1361214501Srpaulo struct ip *ip; 1362214501Srpaulo 1363214501Srpaulo ip = mtod(m, struct ip *); 1364214501Srpaulo hlim = ip->ip_ttl; 1365214501Srpaulo#else 1366214501Srpaulo /* We won't hit this code */ 1367214501Srpaulo hlim = 0; 1368214501Srpaulo#endif 1369214501Srpaulo } else { 1370214501Srpaulo hlim = ip6->ip6_hlim & 0xff; 1371214501Srpaulo } 1372214501Srpaulo *mp = sbcreatecontrol((caddr_t) &hlim, sizeof(int), 1373214501Srpaulo IS2292(inp, IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), 1374214501Srpaulo IPPROTO_IPV6); 1375214501Srpaulo if (*mp) 1376214501Srpaulo mp = &(*mp)->m_next; 1377214501Srpaulo } 1378214501Srpaulo 1379214501Srpaulo if ((inp->inp_flags & IN6P_TCLASS) != 0) { 1380214501Srpaulo int tclass; 1381214501Srpaulo 1382214501Srpaulo if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1383214501Srpaulo#ifdef INET 1384214501Srpaulo struct ip *ip; 1385214501Srpaulo 1386214501Srpaulo ip = mtod(m, struct ip *); 1387214501Srpaulo tclass = ip->ip_tos; 1388214501Srpaulo#else 1389214501Srpaulo /* We won't hit this code */ 1390214501Srpaulo tclass = 0; 1391214501Srpaulo#endif 1392214501Srpaulo } else { 1393214501Srpaulo u_int32_t flowinfo; 1394214501Srpaulo 1395214501Srpaulo flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK); 1396214501Srpaulo flowinfo >>= 20; 1397214501Srpaulo tclass = flowinfo & 0xff; 1398214501Srpaulo } 1399214501Srpaulo *mp = sbcreatecontrol((caddr_t) &tclass, sizeof(int), 1400214501Srpaulo IPV6_TCLASS, IPPROTO_IPV6); 1401214501Srpaulo if (*mp) 1402214501Srpaulo mp = &(*mp)->m_next; 1403214501Srpaulo } 1404214501Srpaulo 1405214501Srpaulo if (v4only != NULL) { 1406214501Srpaulo if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1407214501Srpaulo *v4only = 1; 1408214501Srpaulo } else { 1409214501Srpaulo *v4only = 0; 1410214501Srpaulo } 1411214501Srpaulo } 1412214501Srpaulo 1413214501Srpaulo return (mp); 1414214501Srpaulo} 1415214501Srpaulo 1416214501Srpaulovoid 1417214501Srpauloip6_savecontrol(struct inpcb *in6p, struct mbuf *m, struct mbuf **mp) 1418214501Srpaulo{ 1419214501Srpaulo struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1420214501Srpaulo int v4only = 0; 1421214501Srpaulo 1422214501Srpaulo mp = ip6_savecontrol_v4(in6p, m, mp, &v4only); 1423214501Srpaulo if (v4only) 1424214501Srpaulo return; 1425214501Srpaulo 1426214501Srpaulo /* 1427214501Srpaulo * IPV6_HOPOPTS socket option. Recall that we required super-user 1428214501Srpaulo * privilege for the option (see ip6_ctloutput), but it might be too 1429214501Srpaulo * strict, since there might be some hop-by-hop options which can be 1430214501Srpaulo * returned to normal user. 1431214501Srpaulo * See also RFC 2292 section 6 (or RFC 3542 section 8). 1432214501Srpaulo */ 1433214501Srpaulo if ((in6p->inp_flags & IN6P_HOPOPTS) != 0) { 1434214501Srpaulo /* 1435214501Srpaulo * Check if a hop-by-hop options header is contatined in the 1436214501Srpaulo * received packet, and if so, store the options as ancillary 1437214501Srpaulo * data. Note that a hop-by-hop options header must be 1438214501Srpaulo * just after the IPv6 header, which is assured through the 1439214501Srpaulo * IPv6 input processing. 1440214501Srpaulo */ 1441214501Srpaulo if (ip6->ip6_nxt == IPPROTO_HOPOPTS) { 1442214501Srpaulo struct ip6_hbh *hbh; 1443214501Srpaulo int hbhlen = 0; 1444214501Srpaulo#ifdef PULLDOWN_TEST 1445214501Srpaulo struct mbuf *ext; 1446214501Srpaulo#endif 1447214501Srpaulo 1448214501Srpaulo#ifndef PULLDOWN_TEST 1449214501Srpaulo hbh = (struct ip6_hbh *)(ip6 + 1); 1450214501Srpaulo hbhlen = (hbh->ip6h_len + 1) << 3; 1451214501Srpaulo#else 1452214501Srpaulo ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr), 1453214501Srpaulo ip6->ip6_nxt); 1454214501Srpaulo if (ext == NULL) { 1455214501Srpaulo IP6STAT_INC(ip6s_tooshort); 1456214501Srpaulo return; 1457214501Srpaulo } 1458214501Srpaulo hbh = mtod(ext, struct ip6_hbh *); 1459214501Srpaulo hbhlen = (hbh->ip6h_len + 1) << 3; 1460214501Srpaulo if (hbhlen != ext->m_len) { 1461214501Srpaulo m_freem(ext); 1462214501Srpaulo IP6STAT_INC(ip6s_tooshort); 1463214501Srpaulo return; 1464214501Srpaulo } 1465214501Srpaulo#endif 1466214501Srpaulo 1467214501Srpaulo /* 1468214501Srpaulo * XXX: We copy the whole header even if a 1469214501Srpaulo * jumbo payload option is included, the option which 1470214501Srpaulo * is to be removed before returning according to 1471214501Srpaulo * RFC2292. 1472214501Srpaulo * Note: this constraint is removed in RFC3542 1473214501Srpaulo */ 1474214501Srpaulo *mp = sbcreatecontrol((caddr_t)hbh, hbhlen, 1475214501Srpaulo IS2292(in6p, IPV6_2292HOPOPTS, IPV6_HOPOPTS), 1476214501Srpaulo IPPROTO_IPV6); 1477214501Srpaulo if (*mp) 1478214501Srpaulo mp = &(*mp)->m_next; 1479214501Srpaulo#ifdef PULLDOWN_TEST 1480214501Srpaulo m_freem(ext); 1481214501Srpaulo#endif 1482214501Srpaulo } 1483214501Srpaulo } 1484214501Srpaulo 1485214501Srpaulo if ((in6p->inp_flags & (IN6P_RTHDR | IN6P_DSTOPTS)) != 0) { 1486214501Srpaulo int nxt = ip6->ip6_nxt, off = sizeof(struct ip6_hdr); 1487214501Srpaulo 1488214501Srpaulo /* 1489214501Srpaulo * Search for destination options headers or routing 1490214501Srpaulo * header(s) through the header chain, and stores each 1491214501Srpaulo * header as ancillary data. 1492214501Srpaulo * Note that the order of the headers remains in 1493214501Srpaulo * the chain of ancillary data. 1494214501Srpaulo */ 1495214501Srpaulo while (1) { /* is explicit loop prevention necessary? */ 1496214501Srpaulo struct ip6_ext *ip6e = NULL; 1497214501Srpaulo int elen; 1498214501Srpaulo#ifdef PULLDOWN_TEST 1499214501Srpaulo struct mbuf *ext = NULL; 1500214501Srpaulo#endif 1501214501Srpaulo 1502214501Srpaulo /* 1503214501Srpaulo * if it is not an extension header, don't try to 1504214501Srpaulo * pull it from the chain. 1505214501Srpaulo */ 1506214501Srpaulo switch (nxt) { 1507214501Srpaulo case IPPROTO_DSTOPTS: 1508214501Srpaulo case IPPROTO_ROUTING: 1509214501Srpaulo case IPPROTO_HOPOPTS: 1510214501Srpaulo case IPPROTO_AH: /* is it possible? */ 1511214501Srpaulo break; 1512214501Srpaulo default: 1513214501Srpaulo goto loopend; 1514214501Srpaulo } 1515214501Srpaulo 1516214501Srpaulo#ifndef PULLDOWN_TEST 1517214501Srpaulo if (off + sizeof(*ip6e) > m->m_len) 1518214501Srpaulo goto loopend; 1519214501Srpaulo ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off); 1520214501Srpaulo if (nxt == IPPROTO_AH) 1521214501Srpaulo elen = (ip6e->ip6e_len + 2) << 2; 1522214501Srpaulo else 1523214501Srpaulo elen = (ip6e->ip6e_len + 1) << 3; 1524214501Srpaulo if (off + elen > m->m_len) 1525214501Srpaulo goto loopend; 1526214501Srpaulo#else 1527214501Srpaulo ext = ip6_pullexthdr(m, off, nxt); 1528214501Srpaulo if (ext == NULL) { 1529214501Srpaulo IP6STAT_INC(ip6s_tooshort); 1530214501Srpaulo return; 1531214501Srpaulo } 1532214501Srpaulo ip6e = mtod(ext, struct ip6_ext *); 1533214501Srpaulo if (nxt == IPPROTO_AH) 1534214501Srpaulo elen = (ip6e->ip6e_len + 2) << 2; 1535214501Srpaulo else 1536214501Srpaulo elen = (ip6e->ip6e_len + 1) << 3; 1537214501Srpaulo if (elen != ext->m_len) { 1538214501Srpaulo m_freem(ext); 1539214501Srpaulo IP6STAT_INC(ip6s_tooshort); 1540214501Srpaulo return; 1541214501Srpaulo } 1542214501Srpaulo#endif 1543214501Srpaulo 1544214501Srpaulo switch (nxt) { 1545214501Srpaulo case IPPROTO_DSTOPTS: 1546214501Srpaulo if (!(in6p->inp_flags & IN6P_DSTOPTS)) 1547214501Srpaulo break; 1548214501Srpaulo 1549214501Srpaulo *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1550214501Srpaulo IS2292(in6p, 1551214501Srpaulo IPV6_2292DSTOPTS, IPV6_DSTOPTS), 1552214501Srpaulo IPPROTO_IPV6); 1553214501Srpaulo if (*mp) 1554214501Srpaulo mp = &(*mp)->m_next; 1555214501Srpaulo break; 1556214501Srpaulo case IPPROTO_ROUTING: 1557214501Srpaulo if (!(in6p->inp_flags & IN6P_RTHDR)) 1558214501Srpaulo break; 1559214501Srpaulo 1560214501Srpaulo *mp = sbcreatecontrol((caddr_t)ip6e, elen, 1561214501Srpaulo IS2292(in6p, IPV6_2292RTHDR, IPV6_RTHDR), 1562214501Srpaulo IPPROTO_IPV6); 1563214501Srpaulo if (*mp) 1564214501Srpaulo mp = &(*mp)->m_next; 1565214501Srpaulo break; 1566214501Srpaulo case IPPROTO_HOPOPTS: 1567214501Srpaulo case IPPROTO_AH: /* is it possible? */ 1568214501Srpaulo break; 1569214501Srpaulo 1570214501Srpaulo default: 1571214501Srpaulo /* 1572214501Srpaulo * other cases have been filtered in the above. 1573214501Srpaulo * none will visit this case. here we supply 1574214501Srpaulo * the code just in case (nxt overwritten or 1575214501Srpaulo * other cases). 1576214501Srpaulo */ 1577214501Srpaulo#ifdef PULLDOWN_TEST 1578214501Srpaulo m_freem(ext); 1579214501Srpaulo#endif 1580214501Srpaulo goto loopend; 1581214501Srpaulo 1582214501Srpaulo } 1583214501Srpaulo 1584214501Srpaulo /* proceed with the next header. */ 1585214501Srpaulo off += elen; 1586214501Srpaulo nxt = ip6e->ip6e_nxt; 1587214501Srpaulo ip6e = NULL; 1588214501Srpaulo#ifdef PULLDOWN_TEST 1589214501Srpaulo m_freem(ext); 1590214501Srpaulo ext = NULL; 1591214501Srpaulo#endif 1592214501Srpaulo } 1593214501Srpaulo loopend: 1594214501Srpaulo ; 1595214501Srpaulo } 1596214501Srpaulo} 1597214501Srpaulo#undef IS2292 1598214501Srpaulo 1599214501Srpaulovoid 1600214501Srpauloip6_notify_pmtu(struct inpcb *in6p, struct sockaddr_in6 *dst, u_int32_t *mtu) 1601214501Srpaulo{ 1602214501Srpaulo struct socket *so; 1603214501Srpaulo struct mbuf *m_mtu; 1604214501Srpaulo struct ip6_mtuinfo mtuctl; 1605214501Srpaulo 1606214501Srpaulo so = in6p->inp_socket; 1607214501Srpaulo 1608214501Srpaulo if (mtu == NULL) 1609214501Srpaulo return; 1610214501Srpaulo 1611214501Srpaulo#ifdef DIAGNOSTIC 1612214501Srpaulo if (so == NULL) /* I believe this is impossible */ 1613214501Srpaulo panic("ip6_notify_pmtu: socket is NULL"); 1614214501Srpaulo#endif 1615214501Srpaulo 1616214501Srpaulo bzero(&mtuctl, sizeof(mtuctl)); /* zero-clear for safety */ 1617214501Srpaulo mtuctl.ip6m_mtu = *mtu; 1618214501Srpaulo mtuctl.ip6m_addr = *dst; 1619214501Srpaulo if (sa6_recoverscope(&mtuctl.ip6m_addr)) 1620214501Srpaulo return; 1621214501Srpaulo 1622214501Srpaulo if ((m_mtu = sbcreatecontrol((caddr_t)&mtuctl, sizeof(mtuctl), 1623214501Srpaulo IPV6_PATHMTU, IPPROTO_IPV6)) == NULL) 1624214501Srpaulo return; 1625214501Srpaulo 1626214501Srpaulo if (sbappendaddr(&so->so_rcv, (struct sockaddr *)dst, NULL, m_mtu) 1627214501Srpaulo == 0) { 1628214501Srpaulo m_freem(m_mtu); 1629214501Srpaulo /* XXX: should count statistics */ 1630214501Srpaulo } else 1631214501Srpaulo sorwakeup(so); 1632214501Srpaulo 1633214501Srpaulo return; 1634214501Srpaulo} 1635214501Srpaulo 1636214501Srpaulo#ifdef PULLDOWN_TEST 1637214501Srpaulo/* 1638214501Srpaulo * pull single extension header from mbuf chain. returns single mbuf that 1639214501Srpaulo * contains the result, or NULL on error. 1640214501Srpaulo */ 1641214501Srpaulostatic struct mbuf * 1642214501Srpauloip6_pullexthdr(struct mbuf *m, size_t off, int nxt) 1643214501Srpaulo{ 1644214501Srpaulo struct ip6_ext ip6e; 1645214501Srpaulo size_t elen; 1646214501Srpaulo struct mbuf *n; 1647214501Srpaulo 1648214501Srpaulo#ifdef DIAGNOSTIC 1649214501Srpaulo switch (nxt) { 1650214501Srpaulo case IPPROTO_DSTOPTS: 1651214501Srpaulo case IPPROTO_ROUTING: 1652214501Srpaulo case IPPROTO_HOPOPTS: 1653214501Srpaulo case IPPROTO_AH: /* is it possible? */ 1654214501Srpaulo break; 1655214501Srpaulo default: 1656214501Srpaulo printf("ip6_pullexthdr: invalid nxt=%d\n", nxt); 1657214501Srpaulo } 1658214501Srpaulo#endif 1659214501Srpaulo 1660214501Srpaulo m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1661214501Srpaulo if (nxt == IPPROTO_AH) 1662214501Srpaulo elen = (ip6e.ip6e_len + 2) << 2; 1663214501Srpaulo else 1664214501Srpaulo elen = (ip6e.ip6e_len + 1) << 3; 1665 1666 if (elen > MLEN) 1667 n = m_getcl(M_NOWAIT, MT_DATA, 0); 1668 else 1669 n = m_get(M_NOWAIT, MT_DATA); 1670 if (n == NULL) 1671 return NULL; 1672 1673 m_copydata(m, off, elen, mtod(n, caddr_t)); 1674 n->m_len = elen; 1675 return n; 1676} 1677#endif 1678 1679/* 1680 * Get pointer to the previous header followed by the header 1681 * currently processed. 1682 * XXX: This function supposes that 1683 * M includes all headers, 1684 * the next header field and the header length field of each header 1685 * are valid, and 1686 * the sum of each header length equals to OFF. 1687 * Because of these assumptions, this function must be called very 1688 * carefully. Moreover, it will not be used in the near future when 1689 * we develop `neater' mechanism to process extension headers. 1690 */ 1691char * 1692ip6_get_prevhdr(struct mbuf *m, int off) 1693{ 1694 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1695 1696 if (off == sizeof(struct ip6_hdr)) 1697 return (&ip6->ip6_nxt); 1698 else { 1699 int len, nxt; 1700 struct ip6_ext *ip6e = NULL; 1701 1702 nxt = ip6->ip6_nxt; 1703 len = sizeof(struct ip6_hdr); 1704 while (len < off) { 1705 ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + len); 1706 1707 switch (nxt) { 1708 case IPPROTO_FRAGMENT: 1709 len += sizeof(struct ip6_frag); 1710 break; 1711 case IPPROTO_AH: 1712 len += (ip6e->ip6e_len + 2) << 2; 1713 break; 1714 default: 1715 len += (ip6e->ip6e_len + 1) << 3; 1716 break; 1717 } 1718 nxt = ip6e->ip6e_nxt; 1719 } 1720 if (ip6e) 1721 return (&ip6e->ip6e_nxt); 1722 else 1723 return NULL; 1724 } 1725} 1726 1727/* 1728 * get next header offset. m will be retained. 1729 */ 1730int 1731ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp) 1732{ 1733 struct ip6_hdr ip6; 1734 struct ip6_ext ip6e; 1735 struct ip6_frag fh; 1736 1737 /* just in case */ 1738 if (m == NULL) 1739 panic("ip6_nexthdr: m == NULL"); 1740 if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off) 1741 return -1; 1742 1743 switch (proto) { 1744 case IPPROTO_IPV6: 1745 if (m->m_pkthdr.len < off + sizeof(ip6)) 1746 return -1; 1747 m_copydata(m, off, sizeof(ip6), (caddr_t)&ip6); 1748 if (nxtp) 1749 *nxtp = ip6.ip6_nxt; 1750 off += sizeof(ip6); 1751 return off; 1752 1753 case IPPROTO_FRAGMENT: 1754 /* 1755 * terminate parsing if it is not the first fragment, 1756 * it does not make sense to parse through it. 1757 */ 1758 if (m->m_pkthdr.len < off + sizeof(fh)) 1759 return -1; 1760 m_copydata(m, off, sizeof(fh), (caddr_t)&fh); 1761 /* IP6F_OFF_MASK = 0xfff8(BigEndian), 0xf8ff(LittleEndian) */ 1762 if (fh.ip6f_offlg & IP6F_OFF_MASK) 1763 return -1; 1764 if (nxtp) 1765 *nxtp = fh.ip6f_nxt; 1766 off += sizeof(struct ip6_frag); 1767 return off; 1768 1769 case IPPROTO_AH: 1770 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1771 return -1; 1772 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1773 if (nxtp) 1774 *nxtp = ip6e.ip6e_nxt; 1775 off += (ip6e.ip6e_len + 2) << 2; 1776 return off; 1777 1778 case IPPROTO_HOPOPTS: 1779 case IPPROTO_ROUTING: 1780 case IPPROTO_DSTOPTS: 1781 if (m->m_pkthdr.len < off + sizeof(ip6e)) 1782 return -1; 1783 m_copydata(m, off, sizeof(ip6e), (caddr_t)&ip6e); 1784 if (nxtp) 1785 *nxtp = ip6e.ip6e_nxt; 1786 off += (ip6e.ip6e_len + 1) << 3; 1787 return off; 1788 1789 case IPPROTO_NONE: 1790 case IPPROTO_ESP: 1791 case IPPROTO_IPCOMP: 1792 /* give up */ 1793 return -1; 1794 1795 default: 1796 return -1; 1797 } 1798 1799 return -1; 1800} 1801 1802/* 1803 * get offset for the last header in the chain. m will be kept untainted. 1804 */ 1805int 1806ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp) 1807{ 1808 int newoff; 1809 int nxt; 1810 1811 if (!nxtp) { 1812 nxt = -1; 1813 nxtp = &nxt; 1814 } 1815 while (1) { 1816 newoff = ip6_nexthdr(m, off, proto, nxtp); 1817 if (newoff < 0) 1818 return off; 1819 else if (newoff < off) 1820 return -1; /* invalid */ 1821 else if (newoff == off) 1822 return newoff; 1823 1824 off = newoff; 1825 proto = *nxtp; 1826 } 1827} 1828 1829static struct ip6aux * 1830ip6_addaux(struct mbuf *m) 1831{ 1832 struct m_tag *mtag; 1833 1834 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1835 if (!mtag) { 1836 mtag = m_tag_get(PACKET_TAG_IPV6_INPUT, sizeof(struct ip6aux), 1837 M_NOWAIT); 1838 if (mtag) { 1839 m_tag_prepend(m, mtag); 1840 bzero(mtag + 1, sizeof(struct ip6aux)); 1841 } 1842 } 1843 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1844} 1845 1846static struct ip6aux * 1847ip6_findaux(struct mbuf *m) 1848{ 1849 struct m_tag *mtag; 1850 1851 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1852 return mtag ? (struct ip6aux *)(mtag + 1) : NULL; 1853} 1854 1855static void 1856ip6_delaux(struct mbuf *m) 1857{ 1858 struct m_tag *mtag; 1859 1860 mtag = m_tag_find(m, PACKET_TAG_IPV6_INPUT, NULL); 1861 if (mtag) 1862 m_tag_delete(m, mtag); 1863} 1864 1865/* 1866 * System control for IP6 1867 */ 1868 1869u_char inet6ctlerrmap[PRC_NCMDS] = { 1870 0, 0, 0, 0, 1871 0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH, 1872 EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED, 1873 EMSGSIZE, EHOSTUNREACH, 0, 0, 1874 0, 0, 0, 0, 1875 ENOPROTOOPT 1876}; 1877