1 /* $OpenBSD: dest6.c,v 1.13 2014/06/03 13:32:24 mpi 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/mbuf.h> 36 #include <sys/domain.h> 37 #include <sys/protosw.h> 38 #include <sys/socket.h> 39 #include <sys/errno.h> 40 #include <sys/time.h> 41 #include <sys/kernel.h> 42 43 #include <net/if.h> 44 #include <net/route.h> 45 46 #include <netinet/in.h> 47 #include <netinet/ip6.h> 48 #include <netinet6/ip6_var.h> 49 #include <netinet/icmp6.h> 50 51 /* 52 * Destination options header processing. 53 */ 54 int 55 dest6_input(struct mbuf **mp, int *offp, int proto) 56 { 57 struct mbuf *m = *mp; 58 int off = *offp, dstoptlen, optlen; 59 struct ip6_dest *dstopts; 60 u_int8_t *opt; 61 62 /* validation of the length of the header */ 63 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); 64 if (dstopts == NULL) 65 return IPPROTO_DONE; 66 dstoptlen = (dstopts->ip6d_len + 1) << 3; 67 68 IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 69 if (dstopts == NULL) 70 return IPPROTO_DONE; 71 off += dstoptlen; 72 dstoptlen -= sizeof(struct ip6_dest); 73 opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 74 75 /* search header for all options. */ 76 for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 77 if (*opt != IP6OPT_PAD1 && 78 (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { 79 ip6stat.ip6s_toosmall++; 80 goto bad; 81 } 82 83 switch (*opt) { 84 case IP6OPT_PAD1: 85 optlen = 1; 86 break; 87 case IP6OPT_PADN: 88 optlen = *(opt + 1) + 2; 89 break; 90 default: /* unknown option */ 91 optlen = ip6_unknown_opt(opt, m, 92 opt - mtod(m, u_int8_t *)); 93 if (optlen == -1) 94 return (IPPROTO_DONE); 95 optlen += 2; 96 break; 97 } 98 } 99 100 *offp = off; 101 return (dstopts->ip6d_nxt); 102 103 bad: 104 m_freem(m); 105 return (IPPROTO_DONE); 106 } 107