/* $FreeBSD: src/sys/netinet6/dest6.c,v 1.1.2.4 2002/04/28 05:40:26 suz Exp $ */ /* $KAME: dest6.c,v 1.34 2002/01/08 02:40:55 k-sugyou Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "opt_inet.h" #include "opt_inet6.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Destination options header processing. */ int dest6_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m = *mp; int off = *offp, dstoptlen, optlen; struct ip6_dest *dstopts; u_int8_t *opt; /* validation of the length of the header */ #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(*dstopts), IPPROTO_DONE); dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); #else IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts)); if (dstopts == NULL) return IPPROTO_DONE; #endif dstoptlen = (dstopts->ip6d_len + 1) << 3; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, dstoptlen, IPPROTO_DONE); dstopts = (struct ip6_dest *)(mtod(m, caddr_t) + off); #else IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen); if (dstopts == NULL) return IPPROTO_DONE; #endif off += dstoptlen; dstoptlen -= sizeof(struct ip6_dest); opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest); /* search header for all options. */ for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) { if (*opt != IP6OPT_PAD1 && (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) { ip6stat.ip6s_toosmall++; goto bad; } switch (*opt) { case IP6OPT_PAD1: optlen = 1; break; case IP6OPT_PADN: optlen = *(opt + 1) + 2; break; default: /* unknown option */ optlen = ip6_unknown_opt(opt, m, opt - mtod(m, u_int8_t *)); if (optlen == -1) return (IPPROTO_DONE); optlen += 2; break; } } *offp = off; return (dstopts->ip6d_nxt); bad: m_freem(m); return (IPPROTO_DONE); }