X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/6d2010ae8f7a6078e10b361c6962983bab233e0f..HEAD:/bsd/netinet6/route6.c diff --git a/bsd/netinet6/route6.c b/bsd/netinet6/route6.c index a0dc6c6a6..0a3d9b1ce 100644 --- a/bsd/netinet6/route6.c +++ b/bsd/netinet6/route6.c @@ -1,8 +1,8 @@ /* - * Copyright (c) 2000-2010 Apple Inc. All rights reserved. + * Copyright (c) 2000-2020 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 @@ -11,10 +11,10 @@ * 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, @@ -22,13 +22,10 @@ * 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. @@ -59,9 +56,11 @@ */ #include +#include #include #include #include +#include #include #include @@ -74,211 +73,52 @@ #include -#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 ip6_hdr *ip6 = NULL; struct mbuf *m = *mp; - struct ip6_rthdr *rh; - int off = *offp, rhlen; - struct ip6aux *ip6a; + struct ip6_rthdr *rh = NULL; + int off = *offp, rhlen = 0; +#ifdef notyet + struct ip6aux *ip6a = NULL; ip6a = ip6_findaux(m); if (ip6a) { /* XXX reject home-address option before rthdr */ if (ip6a->ip6a_flags & IP6A_SWAP) { ip6stat.ip6s_badoptions++; + *mp = NULL; m_freem(m); return IPPROTO_DONE; } } + ip6a = NULL; +#endif /* notyet */ -#ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(*rh), return IPPROTO_DONE); + + /* Expect 32-bit aligned data pointer on strict-align platforms */ + MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m); + 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. */ + 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); + (int)((caddr_t)&rh->ip6r_type - (caddr_t)ip6)); + return IPPROTO_DONE; } + *mp = m; *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() */ + return rh->ip6r_nxt; } -#endif /* IP6_RTHDR0_ALLOWED */ -