/* * Copyright (c) 2000-2010 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@ */ /* $FreeBSD: src/sys/netinet6/route6.c,v 1.1.2.3 2001/07/03 11:01:55 ume Exp $ */ /* $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ */ /* * 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. */ #include <sys/param.h> #include <sys/mbuf.h> #include <sys/socket.h> #include <sys/queue.h> #include <string.h> #include <net/if.h> #include <net/route.h> #include <netinet/in.h> #include <netinet6/in6_var.h> #include <netinet/ip6.h> #include <netinet6/ip6_var.h> #include <netinet/icmp6.h> #if IP6_RTHDR0_ALLOWED static int ip6_rthdr0(struct mbuf *, struct ip6_hdr *, struct ip6_rthdr0 *); #endif /* IP6_RTHDR0_ALLOWED */ int route6_input(struct mbuf **mp, int *offp, int proto) { #pragma unused(proto) struct ip6_hdr *ip6; struct mbuf *m = *mp; struct ip6_rthdr *rh; int off = *offp, rhlen; struct ip6aux *ip6a; ip6a = ip6_findaux(m); if (ip6a) { /* XXX reject home-address option before rthdr */ if (ip6a->ip6a_flags & IP6A_SWAP) { ip6stat.ip6s_badoptions++; m_freem(m); return IPPROTO_DONE; } } #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(*rh), return IPPROTO_DONE); ip6 = mtod(m, struct ip6_hdr *); rh = (struct ip6_rthdr *)((caddr_t)ip6 + off); #else ip6 = mtod(m, struct ip6_hdr *); IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); if (rh == NULL) { ip6stat.ip6s_tooshort++; return IPPROTO_DONE; } #endif switch (rh->ip6r_type) { #if IP6_RTHDR0_ALLOWED case IPV6_RTHDR_TYPE_0: rhlen = (rh->ip6r_len + 1) << 3; #ifndef PULLDOWN_TEST /* * note on option length: * due to IP6_EXTHDR_CHECK assumption, we cannot handle * very big routing header (max rhlen == 2048). */ IP6_EXTHDR_CHECK(m, off, rhlen, return IPPROTO_DONE); #else /* * note on option length: * maximum rhlen: 2048 * max mbuf m_pulldown can handle: MCLBYTES == usually 2048 * so, here we are assuming that m_pulldown can handle * rhlen == 2048 case. this may not be a good thing to * assume - we may want to avoid pulling it up altogether. */ IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, rhlen); if (rh == NULL) { ip6stat.ip6s_tooshort++; return IPPROTO_DONE; } #endif if (ip6_rthdr0(m, ip6, (struct ip6_rthdr0 *)rh)) return(IPPROTO_DONE); break; #endif /* IP6_RTHDR0_ALLOWED */ default: /* unknown routing type */ if (rh->ip6r_segleft == 0) { rhlen = (rh->ip6r_len + 1) << 3; break; /* Final dst. Just ignore the header. */ } ip6stat.ip6s_badoptions++; icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, (caddr_t)&rh->ip6r_type - (caddr_t)ip6); return(IPPROTO_DONE); } *offp += rhlen; return(rh->ip6r_nxt); } #if IP6_RTHDR0_ALLOWED /* * Type0 routing header processing * * RFC2292 backward compatibility warning: no support for strict/loose bitmap, * as it was dropped between RFC1883 and RFC2460. */ static int ip6_rthdr0(m, ip6, rh0) struct mbuf *m; struct ip6_hdr *ip6; struct ip6_rthdr0 *rh0; { int addrs, index; struct in6_addr *nextaddr, tmpaddr, ia6 = NULL; struct route_in6 ip6forward_rt; if (rh0->ip6r0_segleft == 0) return(0); if (rh0->ip6r0_len % 2 #if COMPAT_RFC1883 || rh0->ip6r0_len > 46 #endif ) { /* * Type 0 routing header can't contain more than 23 addresses. * RFC 2462: this limitation was removed since strict/loose * bitmap field was deleted. */ ip6stat.ip6s_badoptions++; icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, (caddr_t)&rh0->ip6r0_len - (caddr_t)ip6); return (-1); } if ((addrs = rh0->ip6r0_len / 2) < rh0->ip6r0_segleft) { ip6stat.ip6s_badoptions++; icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, (caddr_t)&rh0->ip6r0_segleft - (caddr_t)ip6); return (-1); } index = addrs - rh0->ip6r0_segleft; rh0->ip6r0_segleft--; /* note that ip6r0_addr does not exist in RFC2292bis */ nextaddr = rh0->ip6r0_addr + index; /* * reject invalid addresses. be proactive about malicious use of * IPv4 mapped/compat address. * XXX need more checks? */ if (IN6_IS_ADDR_MULTICAST(nextaddr) || IN6_IS_ADDR_UNSPECIFIED(nextaddr) || IN6_IS_ADDR_V4MAPPED(nextaddr) || IN6_IS_ADDR_V4COMPAT(nextaddr)) { ip6stat.ip6s_badoptions++; m_freem(m); return (-1); } if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) || IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst) || IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst) || IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) { ip6stat.ip6s_badoptions++; m_freem(m); return (-1); } /* * Determine the scope zone of the next hop, based on the interface * of the current hop. [RFC4007, Section 9] * Then disambiguate the scope zone for the next hop (if necessary). */ if ((ia6 = ip6_getdstifaddr(m)) == NULL) goto bad; if (in6_setscope(nextaddr, ia6->ia_ifp, NULL) != 0) { ip6stat.ip6s_badscope++; IFA_REMREF(&ia6->ia_ifa); ia6 = NULL; goto bad; } IFA_REMREF(&ia6->ia_ifa); ia6 = NULL; /* * Swap the IPv6 destination address and nextaddr. Forward the packet. */ tmpaddr = *nextaddr; *nextaddr = ip6->ip6_dst; in6_clearscope(nextaddr); /* XXX */ ip6->ip6_dst = tmpaddr; if (IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) ip6->ip6_dst.s6_addr16[1] = htons(m->m_pkthdr.rcvif->if_index); /* * Don't use the globally cached route to forward packet having * Type 0 routing header(s); instead, do an explicit lookup using * a local route entry variable, in case the next address in the * packet is bogus (which would otherwise unnecessarily invalidate * the globally cached route). */ bzero(&ip6forward_rt, sizeof (ip6forward_rt)); #if COMPAT_RFC1883 if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8)))) ip6_forward(m, &ip6forward_rt, IPV6_SRCRT_NEIGHBOR, 0); else ip6_forward(m, &ip6forward_rt, IPV6_SRCRT_NOTNEIGHBOR, 0); #else ip6_forward(m, &ip6forward_rt, 1, 0); #endif /* Release reference to the looked up route */ if (ip6forward_rt.ro_rt != NULL) { rtfree(ip6forward_rt.ro_rt); ip6forward_rt.ro_rt = NULL; } return(-1); /* m would be freed in ip6_forward() */ } #endif /* IP6_RTHDR0_ALLOWED */