1 /* $FreeBSD$ */ 2 /* $KAME: dest6.c,v 1.34 2002/01/08 02:40:55 k-sugyou Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/malloc.h> 39 #include <sys/mbuf.h> 40 #include <sys/domain.h> 41 #include <sys/protosw.h> 42 #include <sys/socket.h> 43 #include <sys/errno.h> 44 #include <sys/time.h> 45 #include <sys/kernel.h> 46 47 #include <net/if.h> 48 #include <net/route.h> 49 50 #include <netinet/in.h> 51 #include <netinet/in_var.h> 52 #include <netinet/ip6.h> 53 #include <netinet6/ip6_var.h> 54 #include <netinet/icmp6.h> 55 56 /* 57 * Destination options header processing. 58 */ 59 int 60 dest6_input(mp, offp, proto) 61 struct mbuf **mp; 62 int *offp, proto; 63 { 64 struct mbuf *m = *mp; 65 int off = *offp, dstoptlen, optlen; 66 struct ip6_dest *dstopts; 67 u_int8_t *opt; 68 struct ip6_hdr *ip6; 69 70 ip6 = mtod(m, struct ip6_hdr *); 71 72 /* validation of the length of the header */ 73 #ifndef PULLDOWN_TEST 74 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); 75 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 76 #else 77 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); 78 if (dstopts == NULL) 79 return IPPROTO_DONE; 80 #endif 81 dstoptlen = (dstopts->ip6d_len + 1) << 3; 82 83 #ifndef PULLDOWN_TEST 84 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); 85 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 86 #else 87 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 88 if (dstopts == NULL) 89 return IPPROTO_DONE; 90 #endif 91 off += dstoptlen; 92 dstoptlen -= sizeof(struct ip6_dest); 93 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 94 95 /* search header for all options. */ 96 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 97 if (*opt != IP6OPT_PAD1 && 98 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { 99 ip6stat.ip6s_toosmall++; 100 goto bad; 101 } 102 103 switch (*opt) { 104 case IP6OPT_PAD1: 105 optlen = 1; 106 break; 107 case IP6OPT_PADN: 108 optlen = *(opt + 1) + 2; 109 break; 110 111 default: /* unknown option */ 112 optlen = ip6_unknown_opt(opt, m, 113 opt - mtod(m, u_int8_t *)); 114 if (optlen == -1) 115 return (IPPROTO_DONE); 116 optlen += 2; 117 break; 118 } 119 } 120 121 *offp = off; 122 return (dstopts->ip6d_nxt); 123 124 bad: 125 m_freem(m); 126 return (IPPROTO_DONE); 127 } 128