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      1  1.22      maxv /*	$NetBSD: dest6.c,v 1.22 2018/04/13 11:01:14 maxv Exp $	*/
      2  1.10    itojun /*	$KAME: dest6.c,v 1.25 2001/02/22 01:39:16 itojun Exp $	*/
      3   1.3   thorpej 
      4   1.2    itojun /*
      5   1.2    itojun  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      6   1.2    itojun  * All rights reserved.
      7   1.8    itojun  *
      8   1.2    itojun  * Redistribution and use in source and binary forms, with or without
      9   1.2    itojun  * modification, are permitted provided that the following conditions
     10   1.2    itojun  * are met:
     11   1.2    itojun  * 1. Redistributions of source code must retain the above copyright
     12   1.2    itojun  *    notice, this list of conditions and the following disclaimer.
     13   1.2    itojun  * 2. Redistributions in binary form must reproduce the above copyright
     14   1.2    itojun  *    notice, this list of conditions and the following disclaimer in the
     15   1.2    itojun  *    documentation and/or other materials provided with the distribution.
     16   1.2    itojun  * 3. Neither the name of the project nor the names of its contributors
     17   1.2    itojun  *    may be used to endorse or promote products derived from this software
     18   1.2    itojun  *    without specific prior written permission.
     19   1.8    itojun  *
     20   1.2    itojun  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     21   1.2    itojun  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22   1.2    itojun  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23   1.2    itojun  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     24   1.2    itojun  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25   1.2    itojun  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26   1.2    itojun  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27   1.2    itojun  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28   1.2    itojun  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29   1.2    itojun  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30   1.2    itojun  * SUCH DAMAGE.
     31   1.2    itojun  */
     32  1.11     lukem 
     33  1.11     lukem #include <sys/cdefs.h>
     34  1.22      maxv __KERNEL_RCSID(0, "$NetBSD: dest6.c,v 1.22 2018/04/13 11:01:14 maxv Exp $");
     35   1.2    itojun 
     36   1.2    itojun #include <sys/param.h>
     37   1.2    itojun #include <sys/systm.h>
     38   1.2    itojun #include <sys/mbuf.h>
     39   1.2    itojun #include <sys/errno.h>
     40   1.2    itojun #include <sys/time.h>
     41   1.2    itojun #include <sys/kernel.h>
     42   1.2    itojun 
     43   1.2    itojun #include <net/if.h>
     44   1.2    itojun 
     45   1.2    itojun #include <netinet/in.h>
     46   1.2    itojun #include <netinet/in_var.h>
     47   1.7    itojun #include <netinet/ip6.h>
     48   1.2    itojun #include <netinet6/ip6_var.h>
     49  1.17   thorpej #include <netinet6/ip6_private.h>
     50   1.7    itojun #include <netinet/icmp6.h>
     51   1.2    itojun 
     52   1.2    itojun /*
     53   1.2    itojun  * Destination options header processing.
     54   1.2    itojun  */
     55   1.2    itojun int
     56  1.15  christos dest6_input(struct mbuf **mp, int *offp, int proto)
     57   1.2    itojun {
     58   1.8    itojun 	struct mbuf *m = *mp;
     59  1.21      maxv 	int off = *offp, erroff, dstoptlen, optlen;
     60   1.2    itojun 	struct ip6_dest *dstopts;
     61   1.2    itojun 	u_int8_t *opt;
     62   1.2    itojun 
     63   1.2    itojun 	/* validation of the length of the header */
     64   1.5    itojun 	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, sizeof(*dstopts));
     65   1.5    itojun 	if (dstopts == NULL)
     66   1.5    itojun 		return IPPROTO_DONE;
     67   1.2    itojun 	dstoptlen = (dstopts->ip6d_len + 1) << 3;
     68   1.2    itojun 
     69   1.5    itojun 	IP6_EXTHDR_GET(dstopts, struct ip6_dest *, m, off, dstoptlen);
     70   1.5    itojun 	if (dstopts == NULL)
     71   1.5    itojun 		return IPPROTO_DONE;
     72   1.2    itojun 	off += dstoptlen;
     73   1.2    itojun 	dstoptlen -= sizeof(struct ip6_dest);
     74   1.2    itojun 	opt = (u_int8_t *)dstopts + sizeof(struct ip6_dest);
     75   1.2    itojun 
     76   1.2    itojun 	/* search header for all options. */
     77   1.2    itojun 	for (optlen = 0; dstoptlen > 0; dstoptlen -= optlen, opt += optlen) {
     78  1.10    itojun 		if (*opt != IP6OPT_PAD1 &&
     79  1.10    itojun 		    (dstoptlen < IP6OPT_MINLEN || *(opt + 1) + 2 > dstoptlen)) {
     80  1.17   thorpej 			IP6_STATINC(IP6_STAT_TOOSMALL);
     81   1.9    itojun 			goto bad;
     82   1.9    itojun 		}
     83   1.9    itojun 
     84   1.8    itojun 		switch (*opt) {
     85   1.8    itojun 		case IP6OPT_PAD1:
     86   1.8    itojun 			optlen = 1;
     87   1.8    itojun 			break;
     88   1.8    itojun 		case IP6OPT_PADN:
     89   1.8    itojun 			optlen = *(opt + 1) + 2;
     90   1.8    itojun 			break;
     91   1.8    itojun 		default:		/* unknown option */
     92  1.21      maxv 			erroff = *offp + (opt - (u_int8_t *)dstopts);
     93  1.21      maxv 			optlen = ip6_unknown_opt(opt, m, erroff);
     94   1.8    itojun 			if (optlen == -1)
     95  1.22      maxv 				return IPPROTO_DONE;
     96   1.8    itojun 			optlen += 2;
     97   1.8    itojun 			break;
     98   1.2    itojun 		}
     99   1.2    itojun 	}
    100   1.2    itojun 
    101   1.2    itojun 	*offp = off;
    102  1.21      maxv 	return dstopts->ip6d_nxt;
    103   1.2    itojun 
    104  1.21      maxv bad:
    105   1.2    itojun 	m_freem(m);
    106  1.21      maxv 	return IPPROTO_DONE;
    107   1.2    itojun }
    108