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