X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/91447636331957f3d9b5ca5b508f07c526b0074d..HEAD:/bsd/netinet6/route6.c diff --git a/bsd/netinet6/route6.c b/bsd/netinet6/route6.c index 9e01f4b16..0a3d9b1ce 100644 --- a/bsd/netinet6/route6.c +++ b/bsd/netinet6/route6.c @@ -1,5 +1,30 @@ -/* $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) 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 + * compliance with the License. The rights granted to you under the License + * may not be used to create, or enable the creation or redistribution of, + * unlawful or unlicensed copies of an Apple operating system, or to + * circumvent, violate, or enable the circumvention or violation of, any + * terms of an Apple operating system software license agreement. + * + * Please obtain a copy of the License at + * http://www.opensource.apple.com/apsl/ and read it before using this file. + * + * The Original Code and all software distributed under the License are + * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER + * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, + * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. + * Please see the License for the specific language governing rights and + * limitations under the License. + * + * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ + */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. @@ -31,11 +56,15 @@ */ #include +#include #include #include #include +#include +#include #include +#include #include #include @@ -44,175 +73,52 @@ #include -static int ip6_rthdr0(struct mbuf *, struct ip6_hdr *, - struct ip6_rthdr0 *); - int -route6_input(mp, offp) - struct mbuf **mp; - int *offp; +route6_input(struct mbuf **mp, int *offp, int proto) { - struct ip6_hdr *ip6; +#pragma unused(proto) + struct ip6_hdr *ip6 = NULL; struct mbuf *m = *mp; - struct ip6_rthdr *rh; - int off = *offp, rhlen; - struct mbuf *n; + struct ip6_rthdr *rh = NULL; + int off = *offp, rhlen = 0; +#ifdef notyet + struct ip6aux *ip6a = NULL; - n = ip6_findaux(m); - if (n) { - struct ip6aux *ip6a = mtod(n, struct ip6aux *); + 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) { - 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; 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); -} - -/* - * 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; - - 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 stict/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); - } - - /* - * Swap the IPv6 destination address and nextaddr. Forward the packet. - */ - tmpaddr = *nextaddr; - *nextaddr = ip6->ip6_dst; - if (IN6_IS_ADDR_LINKLOCAL(nextaddr)) - nextaddr->s6_addr16[1] = 0; - 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); - -#if COMPAT_RFC1883 - if (rh0->ip6r0_slmap[index / 8] & (1 << (7 - (index % 8)))) - ip6_forward(m, IPV6_SRCRT_NEIGHBOR, 0); - else - ip6_forward(m, IPV6_SRCRT_NOTNEIGHBOR, 0); -#else - ip6_forward(m, 1, 0); -#endif - - return(-1); /* m would be freed in ip6_forward() */ + return rh->ip6r_nxt; }