route6.c revision 195699
1284778Sdelphij/*- 2267843Sdelphij * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3267843Sdelphij * All rights reserved. 4284778Sdelphij * 5267843Sdelphij * Redistribution and use in source and binary forms, with or without 6267843Sdelphij * modification, are permitted provided that the following conditions 7267843Sdelphij * are met: 8267843Sdelphij * 1. Redistributions of source code must retain the above copyright 9267843Sdelphij * notice, this list of conditions and the following disclaimer. 10267843Sdelphij * 2. Redistributions in binary form must reproduce the above copyright 11267843Sdelphij * notice, this list of conditions and the following disclaimer in the 12267843Sdelphij * documentation and/or other materials provided with the distribution. 13267843Sdelphij * 3. Neither the name of the project nor the names of its contributors 14267843Sdelphij * may be used to endorse or promote products derived from this software 15267843Sdelphij * without specific prior written permission. 16267843Sdelphij * 17267843Sdelphij * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18267843Sdelphij * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19267843Sdelphij * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20284778Sdelphij * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21284778Sdelphij * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22284778Sdelphij * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23284778Sdelphij * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24284778Sdelphij * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25284778Sdelphij * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26284778Sdelphij * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27284778Sdelphij * SUCH DAMAGE. 28284778Sdelphij * 29284778Sdelphij * $KAME: route6.c,v 1.24 2001/03/14 03:07:05 itojun Exp $ 30284778Sdelphij */ 31267843Sdelphij 32267843Sdelphij#include <sys/cdefs.h> 33267843Sdelphij__FBSDID("$FreeBSD: head/sys/netinet6/route6.c 195699 2009-07-14 22:48:30Z rwatson $"); 34267843Sdelphij 35267843Sdelphij#include "opt_inet.h" 36267843Sdelphij#include "opt_inet6.h" 37267843Sdelphij 38267843Sdelphij#include <sys/param.h> 39267843Sdelphij#include <sys/mbuf.h> 40267843Sdelphij#include <sys/socket.h> 41267843Sdelphij#include <sys/systm.h> 42267843Sdelphij#include <sys/queue.h> 43267843Sdelphij#include <sys/vimage.h> 44267843Sdelphij 45267843Sdelphij#include <net/if.h> 46267843Sdelphij 47267843Sdelphij#include <netinet/in.h> 48267843Sdelphij#include <netinet6/in6_var.h> 49267843Sdelphij#include <netinet/ip6.h> 50267843Sdelphij#include <netinet6/ip6_var.h> 51267843Sdelphij#include <netinet6/scope6_var.h> 52267843Sdelphij 53267843Sdelphij#include <netinet/icmp6.h> 54267843Sdelphij 55267843Sdelphij/* 56267843Sdelphij * proto - is unused 57267843Sdelphij */ 58267843Sdelphij 59267843Sdelphijint 60267843Sdelphijroute6_input(struct mbuf **mp, int *offp, int proto) 61267843Sdelphij{ 62267843Sdelphij struct ip6_hdr *ip6; 63267843Sdelphij struct mbuf *m = *mp; 64267843Sdelphij struct ip6_rthdr *rh; 65267843Sdelphij int off = *offp, rhlen; 66267843Sdelphij struct ip6aux *ip6a; 67267843Sdelphij 68267843Sdelphij ip6a = ip6_findaux(m); 69267843Sdelphij if (ip6a) { 70267843Sdelphij /* XXX reject home-address option before rthdr */ 71267843Sdelphij if (ip6a->ip6a_flags & IP6A_SWAP) { 72267843Sdelphij V_ip6stat.ip6s_badoptions++; 73267843Sdelphij m_freem(m); 74267843Sdelphij return IPPROTO_DONE; 75267843Sdelphij } 76267843Sdelphij } 77267843Sdelphij 78267843Sdelphij#ifndef PULLDOWN_TEST 79267843Sdelphij IP6_EXTHDR_CHECK(m, off, sizeof(*rh), IPPROTO_DONE); 80267843Sdelphij ip6 = mtod(m, struct ip6_hdr *); 81267843Sdelphij rh = (struct ip6_rthdr *)((caddr_t)ip6 + off); 82267843Sdelphij#else 83267843Sdelphij ip6 = mtod(m, struct ip6_hdr *); 84267843Sdelphij IP6_EXTHDR_GET(rh, struct ip6_rthdr *, m, off, sizeof(*rh)); 85267843Sdelphij if (rh == NULL) { 86267843Sdelphij V_ip6stat.ip6s_tooshort++; 87267843Sdelphij return IPPROTO_DONE; 88267843Sdelphij } 89267843Sdelphij#endif 90267843Sdelphij 91267843Sdelphij /* 92267843Sdelphij * While this switch may look gratuitous, leave it in 93267843Sdelphij * in favour of RH2 implementations, etc. 94267843Sdelphij */ 95267843Sdelphij switch (rh->ip6r_type) { 96267843Sdelphij default: 97267843Sdelphij /* Unknown routing header type. */ 98267843Sdelphij if (rh->ip6r_segleft == 0) { 99267843Sdelphij rhlen = (rh->ip6r_len + 1) << 3; 100267843Sdelphij break; /* Final dst. Just ignore the header. */ 101330569Sgordon } 102267843Sdelphij V_ip6stat.ip6s_badoptions++; 103267843Sdelphij icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, 104267843Sdelphij (caddr_t)&rh->ip6r_type - (caddr_t)ip6); 105267843Sdelphij return (IPPROTO_DONE); 106267843Sdelphij } 107267843Sdelphij 108267843Sdelphij *offp += rhlen; 109267843Sdelphij return (rh->ip6r_nxt); 110267843Sdelphij} 111267843Sdelphij