103 lines
3.2 KiB
C
103 lines
3.2 KiB
C
/* $OpenBSD: dest6.c,v 1.20 2024/02/13 12:22:09 bluhm Exp $ */
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/* $KAME: dest6.c,v 1.25 2001/02/22 01:39:16 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet/icmp6.h>
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/*
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* Destination options header processing.
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*/
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int
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dest6_input(struct mbuf **mp, int *offp, int proto, int af)
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{
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int off = *offp, dstoptlen, optlen;
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struct ip6_dest *dstopts;
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u_int8_t *opt;
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/* validation of the length of the header */
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IP6_EXTHDR_GET(dstopts, struct ip6_dest *, *mp, off, sizeof(*dstopts));
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if (dstopts == NULL)
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return IPPROTO_DONE;
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dstoptlen = (dstopts->ip6d_len + 1) << 3;
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IP6_EXTHDR_GET(dstopts, struct ip6_dest *, *mp, off, dstoptlen);
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if (dstopts == NULL)
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return IPPROTO_DONE;
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off += dstoptlen;
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dstoptlen -= sizeof(struct ip6_dest);
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opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
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/* search header for all options. */
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for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
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if (*opt != IP6OPT_PAD1 &&
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(dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
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ip6stat_inc(ip6s_toosmall);
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goto bad;
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}
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switch (*opt) {
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case IP6OPT_PAD1:
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optlen = 1;
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break;
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case IP6OPT_PADN:
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optlen = *(opt + 1) + 2;
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break;
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default: /* unknown option */
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optlen = ip6_unknown_opt(mp, opt,
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opt - mtod(*mp, u_int8_t *));
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if (optlen == -1)
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return (IPPROTO_DONE);
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optlen += 2;
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break;
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}
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}
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*offp = off;
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return (dstopts->ip6d_nxt);
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bad:
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m_freemp(mp);
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return (IPPROTO_DONE);
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}
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