1 /* $OpenBSD: dest6.c,v 1.8 2001/02/22 01:40:40 itojun Exp $ */ 2 /* $KAME: dest6.c,v 1.25 2001/02/22 01:39:16 itojun 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 <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/malloc.h> 36 #include <sys/mbuf.h> 37 #include <sys/domain.h> 38 #include <sys/protosw.h> 39 #include <sys/socket.h> 40 #include <sys/errno.h> 41 #include <sys/time.h> 42 #include <sys/kernel.h> 43 44 #include <net/if.h> 45 #include <net/route.h> 46 47 #include <netinet/in.h> 48 #include <netinet/in_var.h> 49 #include <netinet/ip6.h> 50 #include <netinet6/ip6_var.h> 51 #include <netinet/icmp6.h> 52 53 /* 54 * Destination options header processing. 55 */ 56 int 57 dest6_input(mp, offp, proto) 58 struct mbuf **mp; 59 int *offp, proto; 60 { 61 struct mbuf *m = *mp; 62 int off = *offp, dstoptlen, optlen; 63 struct ip6_dest *dstopts; 64 u_int8_t *opt; 65 66 /* validation of the length of the header */ 67 #ifndef PULLDOWN_TEST 68 IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); 69 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 70 #else 71 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); 72 if (dstopts == NULL) 73 return IPPROTO_DONE; 74 #endif 75 dstoptlen = (dstopts->ip6d_len + 1) << 3; 76 77 #ifndef PULLDOWN_TEST 78 IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); 79 dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 80 #else 81 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 82 if (dstopts == NULL) 83 return IPPROTO_DONE; 84 #endif 85 off += dstoptlen; 86 dstoptlen -= sizeof(struct ip6_dest); 87 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 88 89 /* search header for all options. */ 90 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 91 if (*opt != IP6OPT_PAD1 && 92 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { 93 ip6stat.ip6s_toosmall++; 94 goto bad; 95 } 96 97 switch (*opt) { 98 case IP6OPT_PAD1: 99 optlen = 1; 100 break; 101 case IP6OPT_PADN: 102 optlen = *(opt + 1) + 2; 103 break; 104 default: /* unknown option */ 105 if ((optlen = ip6_unknown_opt(opt, m, 106 opt-mtod(m, u_int8_t *))) == -1) 107 return(IPPROTO_DONE); 108 optlen += 2; 109 break; 110 } 111 } 112 113 *offp = off; 114 return (dstopts->ip6d_nxt); 115 116 bad: 117 m_freem(m); 118 return (IPPROTO_DONE); 119 } 120