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      1 /*	$NetBSD: route6.c,v 1.25 2018/02/01 16:23:28 maxv Exp $	*/
      2 /*	$KAME: route6.c,v 1.22 2000/12/03 00:54:00 itojun Exp $	*/
      3 
      4 /*
      5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the project nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/cdefs.h>
     34 __KERNEL_RCSID(0, "$NetBSD: route6.c,v 1.25 2018/02/01 16:23:28 maxv Exp $");
     35 
     36 #include <sys/param.h>
     37 #include <sys/mbuf.h>
     38 #include <sys/systm.h>
     39 
     40 #include <net/if.h>
     41 
     42 #include <netinet/in.h>
     43 #include <netinet6/in6_var.h>
     44 #include <netinet/ip6.h>
     45 #include <netinet6/ip6_var.h>
     46 #include <netinet6/ip6_private.h>
     47 
     48 #include <netinet/icmp6.h>
     49 
     50 int
     51 route6_input(struct mbuf **mp, int *offp, int proto)
     52 {
     53 	struct mbuf *m = *mp;
     54 	struct ip6_rthdr *rh;
     55 	int off = *offp, rhlen;
     56 
     57 	IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
     58 	if (rh == NULL) {
     59 		IP6_STATINC(IP6_STAT_TOOSHORT);
     60 		return IPPROTO_DONE;
     61 	}
     62 
     63 	switch (rh->ip6r_type) {
     64 	case IPV6_RTHDR_TYPE_0:
     65 		/*
     66 		 * RFC5095: RH0 must be treated as unrecognized.
     67 		 */
     68 	default:
     69 		/* unknown routing type */
     70 		if (rh->ip6r_segleft == 0) {
     71 			rhlen = (rh->ip6r_len + 1) << 3;
     72 			break;	/* Final dst. Just ignore the header. */
     73 		}
     74 		IP6_STATINC(IP6_STAT_BADOPTIONS);
     75 		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
     76 		    off + offsetof(struct ip6_rthdr, ip6r_type));
     77 		return IPPROTO_DONE;
     78 	}
     79 
     80 	*offp += rhlen;
     81 	return rh->ip6r_nxt;
     82 }
     83