sys/netinet6/route6.c

1.25      maxv /*	$NetBSD: route6.c,v 1.25 2018/02/01 16:23:28 maxv Exp $	*/
 1.8    itojun /*	$KAME: route6.c,v 1.22 2000/12/03 00:54:00 itojun Exp $	*/
 1.3   thorpej
 1.2    itojun /*
 1.2    itojun  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 1.2    itojun  * All rights reserved.
 1.7    itojun  *
 1.2    itojun  * Redistribution and use in source and binary forms, with or without
 1.2    itojun  * modification, are permitted provided that the following conditions
 1.2    itojun  * are met:
 1.2    itojun  * 1. Redistributions of source code must retain the above copyright
 1.2    itojun  *    notice, this list of conditions and the following disclaimer.
 1.2    itojun  * 2. Redistributions in binary form must reproduce the above copyright
 1.2    itojun  *    notice, this list of conditions and the following disclaimer in the
 1.2    itojun  *    documentation and/or other materials provided with the distribution.
 1.2    itojun  * 3. Neither the name of the project nor the names of its contributors
 1.2    itojun  *    may be used to endorse or promote products derived from this software
 1.2    itojun  *    without specific prior written permission.
 1.7    itojun  *
 1.2    itojun  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 1.2    itojun  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 1.2    itojun  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 1.2    itojun  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 1.2    itojun  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 1.2    itojun  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 1.2    itojun  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 1.2    itojun  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 1.2    itojun  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 1.2    itojun  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 1.2    itojun  * SUCH DAMAGE.
 1.2    itojun  */
1.10     lukem
1.10     lukem #include <sys/cdefs.h>
1.25      maxv __KERNEL_RCSID(0, "$NetBSD: route6.c,v 1.25 2018/02/01 16:23:28 maxv Exp $");
 1.2    itojun
 1.2    itojun #include <sys/param.h>
 1.2    itojun #include <sys/mbuf.h>
 1.4    itojun #include <sys/systm.h>
 1.2    itojun
 1.2    itojun #include <net/if.h>
 1.2    itojun
 1.2    itojun #include <netinet/in.h>
 1.4    itojun #include <netinet6/in6_var.h>
 1.6    itojun #include <netinet/ip6.h>
 1.2    itojun #include <netinet6/ip6_var.h>
1.23   thorpej #include <netinet6/ip6_private.h>
 1.2    itojun
 1.2    itojun #include <netinet/icmp6.h>
 1.2    itojun
 1.2    itojun int
1.16  christos route6_input(struct mbuf **mp, int *offp, int proto)
 1.2    itojun {
 1.8    itojun 	struct mbuf *m = *mp;
 1.8    itojun 	struct ip6_rthdr *rh;
 1.2    itojun 	int off = *offp, rhlen;
 1.2    itojun
 1.4    itojun 	IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
 1.4    itojun 	if (rh == NULL) {
1.23   thorpej 		IP6_STATINC(IP6_STAT_TOOSHORT);
 1.4    itojun 		return IPPROTO_DONE;
 1.4    itojun 	}
 1.2    itojun
 1.8    itojun 	switch (rh->ip6r_type) {
 1.8    itojun 	case IPV6_RTHDR_TYPE_0:
1.19      yamt 		/*
1.25      maxv 		 * RFC5095: RH0 must be treated as unrecognized.
1.19      yamt 		 */
 1.8    itojun 	default:
 1.8    itojun 		/* unknown routing type */
 1.8    itojun 		if (rh->ip6r_segleft == 0) {
 1.8    itojun 			rhlen = (rh->ip6r_len + 1) << 3;
 1.8    itojun 			break;	/* Final dst. Just ignore the header. */
 1.8    itojun 		}
1.23   thorpej 		IP6_STATINC(IP6_STAT_BADOPTIONS);
 1.8    itojun 		icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
1.24      maxv 		    off + offsetof(struct ip6_rthdr, ip6r_type));
1.25      maxv 		return IPPROTO_DONE;
 1.2    itojun 	}
 1.2    itojun
 1.2    itojun 	*offp += rhlen;
1.25      maxv 	return rh->ip6r_nxt;
 1.2    itojun }