90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
/* $OpenBSD: route6.c,v 1.22 2024/02/13 12:22:09 bluhm Exp $ */
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/* $KAME: route6.c,v 1.22 2000/12/03 00:54:00 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/mbuf.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet6/in6_var.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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* proto is unused
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*/
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int
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route6_input(struct mbuf **mp, int *offp, int proto, int af)
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{
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struct ip6_hdr *ip6;
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struct mbuf *m = *mp;
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struct ip6_rthdr *rh;
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int off = *offp, rhlen;
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ip6 = mtod(m, struct ip6_hdr *);
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IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh));
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if (rh == NULL) {
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ip6stat_inc(ip6s_tooshort);
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return IPPROTO_DONE;
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}
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switch (rh->ip6r_type) {
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case IPV6_RTHDR_TYPE_0:
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/*
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* RFC 5095 specifies to handle routing header type 0
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* the same way as an unrecognised routing type.
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*/
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/* FALLTHROUGH */
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default:
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/* unknown routing type */
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if (rh->ip6r_segleft == 0) {
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rhlen = (rh->ip6r_len + 1) << 3;
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break; /* Final dst. Just ignore the header. */
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}
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ip6stat_inc(ip6s_badoptions);
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icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
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(caddr_t)&rh->ip6r_type - (caddr_t)ip6);
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return (IPPROTO_DONE);
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}
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*offp += rhlen;
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return (rh->ip6r_nxt);
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}
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