1 /* $FreeBSD$ */ 2 /* $KAME: dest6.c,v 1.59 2003/07/11 13:21:16 t-momose 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(struct mbuf **mp, int *offp, int proto) 61 { 62 struct mbuf *m = *mp; 63 int off = *offp, dstoptlen, optlen; 64 struct ip6_dest *dstopts; 65 u_int8_t *opt; 66 67 /* validation of the length of the header */ 68 #ifndef PULLDOWN_TEST 69 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); 70 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 71 #else 72 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); 73 if (dstopts == NULL) 74 return IPPROTO_DONE; 75 #endif 76 dstoptlen = (dstopts->ip6d_len + 1) << 3; 77 78 #ifndef PULLDOWN_TEST 79 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); 80 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 81 #else 82 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 83 if (dstopts == NULL) 84 return IPPROTO_DONE; 85 #endif 86 off += dstoptlen; 87 dstoptlen -= sizeof(struct ip6_dest); 88 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 89 90 /* search header for all options. */ 91 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 92 if (*opt != IP6OPT_PAD1 && 93 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { 94 ip6stat.ip6s_toosmall++; 95 goto bad; 96 } 97 98 switch (*opt) { 99 case IP6OPT_PAD1: 100 optlen = 1; 101 break; 102 case IP6OPT_PADN: 103 optlen = *(opt + 1) + 2; 104 break; 105 default: /* unknown option */ 106 optlen = ip6_unknown_opt(opt, m, 107 opt - mtod(m, u_int8_t *)); 108 if (optlen == -1) 109 return (IPPROTO_DONE); 110 optlen += 2; 111 break; 112 } 113 } 114 115 *offp = off; 116 return (dstopts->ip6d_nxt); 117 118 bad: 119 m_freem(m); 120 return (IPPROTO_DONE); 121 } 122