1139825Simp/*- 286231Stmm * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3117119Stmm * All rights reserved. 4167308Smarius * 586231Stmm * Redistribution and use in source and binary forms, with or without 686231Stmm * modification, are permitted provided that the following conditions 786231Stmm * are met: 886231Stmm * 1. Redistributions of source code must retain the above copyright 986231Stmm * notice, this list of conditions and the following disclaimer. 1086231Stmm * 2. Redistributions in binary form must reproduce the above copyright 1186231Stmm * notice, this list of conditions and the following disclaimer in the 1286231Stmm * documentation and/or other materials provided with the distribution. 1386231Stmm * 3. Neither the name of the project nor the names of its contributors 1486231Stmm * may be used to endorse or promote products derived from this software 1586231Stmm * without specific prior written permission. 1686231Stmm * 1786231Stmm * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1886231Stmm * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1986231Stmm * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2086231Stmm * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2186231Stmm * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2286231Stmm * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2386231Stmm * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2486231Stmm * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2586231Stmm * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2686231Stmm * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2786231Stmm * SUCH DAMAGE. 2886231Stmm * 2986231Stmm * $KAME: dest6.c,v 1.59 2003/07/11 13:21:16 t-momose Exp $ 3090617Stmm */ 3186231Stmm 3286231Stmm#include <sys/cdefs.h> 33152696Smarius__FBSDID("$FreeBSD$"); 34152696Smarius 35152696Smarius#include "opt_inet.h" 3686231Stmm#include "opt_inet6.h" 37153052Smarius 38153052Smarius#include <sys/param.h> 3986231Stmm#include <sys/systm.h> 4086231Stmm#include <sys/malloc.h> 41117119Stmm#include <sys/mbuf.h> 4286231Stmm#include <sys/domain.h> 4386231Stmm#include <sys/protosw.h> 4486231Stmm#include <sys/socket.h> 4586231Stmm#include <sys/errno.h> 4686231Stmm#include <sys/time.h> 47174117Smarius#include <sys/kernel.h> 48131949Smarcel 4986231Stmm#include <net/if.h> 50170851Smarius#include <net/route.h> 51167308Smarius 52130068Sphk#include <netinet/in.h> 53170851Smarius#include <netinet/in_var.h> 54107477Stmm#include <netinet/ip6.h> 55153055Smarius#include <netinet6/ip6_var.h> 56171730Smarius#include <netinet/icmp6.h> 57247600Smarius 5886231Stmm/* 59133589Smarius * Destination options header processing. 60133589Smarius */ 61119338Simpint 6286231Stmmdest6_input(struct mbuf **mp, int *offp, int proto) 6386231Stmm{ 64167308Smarius struct mbuf *m = *mp; 65116541Stmm int off = *offp, dstoptlen, optlen; 6686231Stmm struct ip6_dest *dstopts; 67167308Smarius u_int8_t *opt; 6886231Stmm 69152698Smarius /* validation of the length of the header */ 7086231Stmm#ifndef PULLDOWN_TEST 71165886Smarius IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); 72119291Simp dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 7386231Stmm#else 7486231Stmm IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); 7586231Stmm if (dstopts == NULL) 7686231Stmm return IPPROTO_DONE; 7786231Stmm#endif 7886231Stmm dstoptlen = (dstopts->ip6d_len + 1) << 3; 7986231Stmm 80152696Smarius#ifndef PULLDOWN_TEST 81152696Smarius IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); 82167308Smarius dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); 83172066Smarius#else 84247620Smarius IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); 85172066Smarius if (dstopts == NULL) 8690617Stmm return IPPROTO_DONE; 87220039Smarius#endif 88220039Smarius off += dstoptlen; 89172066Smarius dstoptlen -= sizeof(struct ip6_dest); 90172066Smarius opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); 91178443Smarius 92178443Smarius /* search header for all options. */ 9386231Stmm for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { 9486231Stmm if (*opt != IP6OPT_PAD1 && 95167308Smarius (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { 96167308Smarius IP6STAT_INC(ip6s_toosmall); 97167308Smarius goto bad; 98247600Smarius } 99247620Smarius 100247620Smarius switch (*opt) { 10186231Stmm case IP6OPT_PAD1: 102167308Smarius optlen = 1; 10386231Stmm break; 10486231Stmm case IP6OPT_PADN: 10586231Stmm optlen = *(opt + 1) + 2; 106152698Smarius break; 10786231Stmm default: /* unknown option */ 10886231Stmm optlen = ip6_unknown_opt(opt, m, 109152696Smarius opt - mtod(m, u_int8_t *)); 11086231Stmm if (optlen == -1) 111117119Stmm return (IPPROTO_DONE); 112117119Stmm optlen += 2; 113117119Stmm break; 114117119Stmm } 115117119Stmm } 116117119Stmm 117225931Smarius *offp = off; 118167308Smarius return (dstopts->ip6d_nxt); 119117119Stmm 120117119Stmm bad: 121117119Stmm m_freem(m); 122117119Stmm return (IPPROTO_DONE); 123133589Smarius} 124220039Smarius