1 /* $NetBSD: dest6.c,v 1.17 2008/04/15 03:57:04 thorpej 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/cdefs.h> 34 __KERNEL_RCSID(0, "$NetBSD: dest6.c,v 1.17 2008/04/15 03:57:04 thorpej Exp $"); 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 <netinet6/ip6_private.h> 55 #include <netinet/icmp6.h> 56 57 /* 58 * Destination options header processing. 59 */ 60 int 61 dest6_input(struct mbuf **mp, int *offp, int proto) 62 { 63 struct mbuf *m = *mp; 64 int off = *offp, dstoptlen, optlen; 65 struct ip6_dest *dstopts; 66 u_int8_t *opt; 67 68 /* validation of the length of the header */ 69 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); 70 if (dstopts == NULL) 71 return IPPROTO_DONE; 72 dstoptlen = (dstopts->ip6d_len + 1) << 3; 73 74 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 75 if (dstopts == NULL) 76 return IPPROTO_DONE; 77 off += dstoptlen; 78 dstoptlen -= sizeof(struct ip6_dest); 79 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 80 81 /* search header for all options. */ 82 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 83 if (*opt != IP6OPT_PAD1 && 84 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { 85 IP6_STATINC(IP6_STAT_TOOSMALL); 86 goto bad; 87 } 88 89 switch (*opt) { 90 case IP6OPT_PAD1: 91 optlen = 1; 92 break; 93 case IP6OPT_PADN: 94 optlen = *(opt + 1) + 2; 95 break; 96 default: /* unknown option */ 97 optlen = ip6_unknown_opt(opt, m, 98 opt - mtod(m, u_int8_t *)); 99 if (optlen == -1) 100 return (IPPROTO_DONE); 101 optlen += 2; 102 break; 103 } 104 } 105 106 *offp = off; 107 return (dstopts->ip6d_nxt); 108 109 bad: 110 m_freem(m); 111 return (IPPROTO_DONE); 112 } 113